The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1 | /*#define CHASE_CHAIN*/ |
| 2 | /* |
| 3 | * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998 |
| 4 | * The Regents of the University of California. All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that: (1) source code distributions |
| 8 | * retain the above copyright notice and this paragraph in its entirety, (2) |
| 9 | * distributions including binary code include the above copyright notice and |
| 10 | * this paragraph in its entirety in the documentation or other materials |
| 11 | * provided with the distribution, and (3) all advertising materials mentioning |
| 12 | * features or use of this software display the following acknowledgement: |
| 13 | * ``This product includes software developed by the University of California, |
| 14 | * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| 15 | * the University nor the names of its contributors may be used to endorse |
| 16 | * or promote products derived from this software without specific prior |
| 17 | * written permission. |
| 18 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| 19 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| 20 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 21 | */ |
| 22 | #ifndef lint |
| 23 | static const char rcsid[] _U_ = |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 24 | "@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.309 2008-12-23 20:13:29 guy Exp $ (LBL)"; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 25 | #endif |
| 26 | |
| 27 | #ifdef HAVE_CONFIG_H |
| 28 | #include "config.h" |
| 29 | #endif |
| 30 | |
| 31 | #ifdef WIN32 |
| 32 | #include <pcap-stdinc.h> |
| 33 | #else /* WIN32 */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 34 | #if HAVE_INTTYPES_H |
| 35 | #include <inttypes.h> |
| 36 | #elif HAVE_STDINT_H |
| 37 | #include <stdint.h> |
| 38 | #endif |
| 39 | #ifdef HAVE_SYS_BITYPES_H |
| 40 | #include <sys/bitypes.h> |
| 41 | #endif |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 42 | #include <sys/types.h> |
| 43 | #include <sys/socket.h> |
| 44 | #endif /* WIN32 */ |
| 45 | |
| 46 | /* |
| 47 | * XXX - why was this included even on UNIX? |
| 48 | */ |
| 49 | #ifdef __MINGW32__ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 50 | #include "ip6_misc.h" |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 51 | #endif |
| 52 | |
| 53 | #ifndef WIN32 |
| 54 | |
| 55 | #ifdef __NetBSD__ |
| 56 | #include <sys/param.h> |
| 57 | #endif |
| 58 | |
| 59 | #include <netinet/in.h> |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 60 | #include <arpa/inet.h> |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 61 | |
| 62 | #endif /* WIN32 */ |
| 63 | |
| 64 | #include <stdlib.h> |
| 65 | #include <string.h> |
| 66 | #include <memory.h> |
| 67 | #include <setjmp.h> |
| 68 | #include <stdarg.h> |
| 69 | |
| 70 | #ifdef MSDOS |
| 71 | #include "pcap-dos.h" |
| 72 | #endif |
| 73 | |
| 74 | #include "pcap-int.h" |
| 75 | |
| 76 | #include "ethertype.h" |
| 77 | #include "nlpid.h" |
| 78 | #include "llc.h" |
| 79 | #include "gencode.h" |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 80 | #include "ieee80211.h" |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 81 | #include "atmuni31.h" |
| 82 | #include "sunatmpos.h" |
| 83 | #include "ppp.h" |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 84 | #include "pcap/sll.h" |
| 85 | #include "pcap/ipnet.h" |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 86 | #include "arcnet.h" |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 87 | #if defined(linux) && defined(PF_PACKET) && defined(SO_ATTACH_FILTER) |
| 88 | #include <linux/types.h> |
| 89 | #include <linux/if_packet.h> |
| 90 | #include <linux/filter.h> |
| 91 | #endif |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 92 | #ifdef HAVE_NET_PFVAR_H |
| 93 | #include <sys/socket.h> |
| 94 | #include <net/if.h> |
| 95 | #include <net/pfvar.h> |
| 96 | #include <net/if_pflog.h> |
| 97 | #endif |
| 98 | #ifndef offsetof |
| 99 | #define offsetof(s, e) ((size_t)&((s *)0)->e) |
| 100 | #endif |
| 101 | #ifdef INET6 |
| 102 | #ifndef WIN32 |
| 103 | #include <netdb.h> /* for "struct addrinfo" */ |
| 104 | #endif /* WIN32 */ |
| 105 | #endif /*INET6*/ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 106 | #include <pcap/namedb.h> |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 107 | |
| 108 | #define ETHERMTU 1500 |
| 109 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 110 | #ifndef IPPROTO_HOPOPTS |
| 111 | #define IPPROTO_HOPOPTS 0 |
| 112 | #endif |
| 113 | #ifndef IPPROTO_ROUTING |
| 114 | #define IPPROTO_ROUTING 43 |
| 115 | #endif |
| 116 | #ifndef IPPROTO_FRAGMENT |
| 117 | #define IPPROTO_FRAGMENT 44 |
| 118 | #endif |
| 119 | #ifndef IPPROTO_DSTOPTS |
| 120 | #define IPPROTO_DSTOPTS 60 |
| 121 | #endif |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 122 | #ifndef IPPROTO_SCTP |
| 123 | #define IPPROTO_SCTP 132 |
| 124 | #endif |
| 125 | |
| 126 | #ifdef HAVE_OS_PROTO_H |
| 127 | #include "os-proto.h" |
| 128 | #endif |
| 129 | |
| 130 | #define JMP(c) ((c)|BPF_JMP|BPF_K) |
| 131 | |
| 132 | /* Locals */ |
| 133 | static jmp_buf top_ctx; |
| 134 | static pcap_t *bpf_pcap; |
| 135 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 136 | /* Hack for updating VLAN, MPLS, and PPPoE offsets. */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 137 | #ifdef WIN32 |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 138 | static u_int orig_linktype = (u_int)-1, orig_nl = (u_int)-1, label_stack_depth = (u_int)-1; |
| 139 | #else |
| 140 | static u_int orig_linktype = -1U, orig_nl = -1U, label_stack_depth = -1U; |
| 141 | #endif |
| 142 | |
| 143 | /* XXX */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 144 | static int pcap_fddipad; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 145 | |
| 146 | /* VARARGS */ |
| 147 | void |
| 148 | bpf_error(const char *fmt, ...) |
| 149 | { |
| 150 | va_list ap; |
| 151 | |
| 152 | va_start(ap, fmt); |
| 153 | if (bpf_pcap != NULL) |
| 154 | (void)vsnprintf(pcap_geterr(bpf_pcap), PCAP_ERRBUF_SIZE, |
| 155 | fmt, ap); |
| 156 | va_end(ap); |
| 157 | longjmp(top_ctx, 1); |
| 158 | /* NOTREACHED */ |
| 159 | } |
| 160 | |
| 161 | static void init_linktype(pcap_t *); |
| 162 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 163 | static void init_regs(void); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 164 | static int alloc_reg(void); |
| 165 | static void free_reg(int); |
| 166 | |
| 167 | static struct block *root; |
| 168 | |
| 169 | /* |
| 170 | * Value passed to gen_load_a() to indicate what the offset argument |
| 171 | * is relative to. |
| 172 | */ |
| 173 | enum e_offrel { |
| 174 | OR_PACKET, /* relative to the beginning of the packet */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 175 | OR_LINK, /* relative to the beginning of the link-layer header */ |
| 176 | OR_MACPL, /* relative to the end of the MAC-layer header */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 177 | OR_NET, /* relative to the network-layer header */ |
| 178 | OR_NET_NOSNAP, /* relative to the network-layer header, with no SNAP header at the link layer */ |
| 179 | OR_TRAN_IPV4, /* relative to the transport-layer header, with IPv4 network layer */ |
| 180 | OR_TRAN_IPV6 /* relative to the transport-layer header, with IPv6 network layer */ |
| 181 | }; |
| 182 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 183 | #ifdef INET6 |
| 184 | /* |
| 185 | * As errors are handled by a longjmp, anything allocated must be freed |
| 186 | * in the longjmp handler, so it must be reachable from that handler. |
| 187 | * One thing that's allocated is the result of pcap_nametoaddrinfo(); |
| 188 | * it must be freed with freeaddrinfo(). This variable points to any |
| 189 | * addrinfo structure that would need to be freed. |
| 190 | */ |
| 191 | static struct addrinfo *ai; |
| 192 | #endif |
| 193 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 194 | /* |
| 195 | * We divy out chunks of memory rather than call malloc each time so |
| 196 | * we don't have to worry about leaking memory. It's probably |
| 197 | * not a big deal if all this memory was wasted but if this ever |
| 198 | * goes into a library that would probably not be a good idea. |
| 199 | * |
| 200 | * XXX - this *is* in a library.... |
| 201 | */ |
| 202 | #define NCHUNKS 16 |
| 203 | #define CHUNK0SIZE 1024 |
| 204 | struct chunk { |
| 205 | u_int n_left; |
| 206 | void *m; |
| 207 | }; |
| 208 | |
| 209 | static struct chunk chunks[NCHUNKS]; |
| 210 | static int cur_chunk; |
| 211 | |
| 212 | static void *newchunk(u_int); |
| 213 | static void freechunks(void); |
| 214 | static inline struct block *new_block(int); |
| 215 | static inline struct slist *new_stmt(int); |
| 216 | static struct block *gen_retblk(int); |
| 217 | static inline void syntax(void); |
| 218 | |
| 219 | static void backpatch(struct block *, struct block *); |
| 220 | static void merge(struct block *, struct block *); |
| 221 | static struct block *gen_cmp(enum e_offrel, u_int, u_int, bpf_int32); |
| 222 | static struct block *gen_cmp_gt(enum e_offrel, u_int, u_int, bpf_int32); |
| 223 | static struct block *gen_cmp_ge(enum e_offrel, u_int, u_int, bpf_int32); |
| 224 | static struct block *gen_cmp_lt(enum e_offrel, u_int, u_int, bpf_int32); |
| 225 | static struct block *gen_cmp_le(enum e_offrel, u_int, u_int, bpf_int32); |
| 226 | static struct block *gen_mcmp(enum e_offrel, u_int, u_int, bpf_int32, |
| 227 | bpf_u_int32); |
| 228 | static struct block *gen_bcmp(enum e_offrel, u_int, u_int, const u_char *); |
| 229 | static struct block *gen_ncmp(enum e_offrel, bpf_u_int32, bpf_u_int32, |
| 230 | bpf_u_int32, bpf_u_int32, int, bpf_int32); |
| 231 | static struct slist *gen_load_llrel(u_int, u_int); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 232 | static struct slist *gen_load_macplrel(u_int, u_int); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 233 | static struct slist *gen_load_a(enum e_offrel, u_int, u_int); |
| 234 | static struct slist *gen_loadx_iphdrlen(void); |
| 235 | static struct block *gen_uncond(int); |
| 236 | static inline struct block *gen_true(void); |
| 237 | static inline struct block *gen_false(void); |
| 238 | static struct block *gen_ether_linktype(int); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 239 | static struct block *gen_ipnet_linktype(int); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 240 | static struct block *gen_linux_sll_linktype(int); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 241 | static struct slist *gen_load_prism_llprefixlen(void); |
| 242 | static struct slist *gen_load_avs_llprefixlen(void); |
| 243 | static struct slist *gen_load_radiotap_llprefixlen(void); |
| 244 | static struct slist *gen_load_ppi_llprefixlen(void); |
| 245 | static void insert_compute_vloffsets(struct block *); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 246 | static struct slist *gen_llprefixlen(void); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 247 | static struct slist *gen_off_macpl(void); |
| 248 | static int ethertype_to_ppptype(int); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 249 | static struct block *gen_linktype(int); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 250 | static struct block *gen_snap(bpf_u_int32, bpf_u_int32); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 251 | static struct block *gen_llc_linktype(int); |
| 252 | static struct block *gen_hostop(bpf_u_int32, bpf_u_int32, int, int, u_int, u_int); |
| 253 | #ifdef INET6 |
| 254 | static struct block *gen_hostop6(struct in6_addr *, struct in6_addr *, int, int, u_int, u_int); |
| 255 | #endif |
| 256 | static struct block *gen_ahostop(const u_char *, int); |
| 257 | static struct block *gen_ehostop(const u_char *, int); |
| 258 | static struct block *gen_fhostop(const u_char *, int); |
| 259 | static struct block *gen_thostop(const u_char *, int); |
| 260 | static struct block *gen_wlanhostop(const u_char *, int); |
| 261 | static struct block *gen_ipfchostop(const u_char *, int); |
| 262 | static struct block *gen_dnhostop(bpf_u_int32, int); |
| 263 | static struct block *gen_mpls_linktype(int); |
| 264 | static struct block *gen_host(bpf_u_int32, bpf_u_int32, int, int, int); |
| 265 | #ifdef INET6 |
| 266 | static struct block *gen_host6(struct in6_addr *, struct in6_addr *, int, int, int); |
| 267 | #endif |
| 268 | #ifndef INET6 |
| 269 | static struct block *gen_gateway(const u_char *, bpf_u_int32 **, int, int); |
| 270 | #endif |
| 271 | static struct block *gen_ipfrag(void); |
| 272 | static struct block *gen_portatom(int, bpf_int32); |
| 273 | static struct block *gen_portrangeatom(int, bpf_int32, bpf_int32); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 274 | static struct block *gen_portatom6(int, bpf_int32); |
| 275 | static struct block *gen_portrangeatom6(int, bpf_int32, bpf_int32); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 276 | struct block *gen_portop(int, int, int); |
| 277 | static struct block *gen_port(int, int, int); |
| 278 | struct block *gen_portrangeop(int, int, int, int); |
| 279 | static struct block *gen_portrange(int, int, int, int); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 280 | struct block *gen_portop6(int, int, int); |
| 281 | static struct block *gen_port6(int, int, int); |
| 282 | struct block *gen_portrangeop6(int, int, int, int); |
| 283 | static struct block *gen_portrange6(int, int, int, int); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 284 | static int lookup_proto(const char *, int); |
| 285 | static struct block *gen_protochain(int, int, int); |
| 286 | static struct block *gen_proto(int, int, int); |
| 287 | static struct slist *xfer_to_x(struct arth *); |
| 288 | static struct slist *xfer_to_a(struct arth *); |
| 289 | static struct block *gen_mac_multicast(int); |
| 290 | static struct block *gen_len(int, int); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 291 | static struct block *gen_check_802_11_data_frame(void); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 292 | |
| 293 | static struct block *gen_ppi_dlt_check(void); |
| 294 | static struct block *gen_msg_abbrev(int type); |
| 295 | |
| 296 | static void * |
| 297 | newchunk(n) |
| 298 | u_int n; |
| 299 | { |
| 300 | struct chunk *cp; |
| 301 | int k; |
| 302 | size_t size; |
| 303 | |
| 304 | #ifndef __NetBSD__ |
| 305 | /* XXX Round up to nearest long. */ |
| 306 | n = (n + sizeof(long) - 1) & ~(sizeof(long) - 1); |
| 307 | #else |
| 308 | /* XXX Round up to structure boundary. */ |
| 309 | n = ALIGN(n); |
| 310 | #endif |
| 311 | |
| 312 | cp = &chunks[cur_chunk]; |
| 313 | if (n > cp->n_left) { |
| 314 | ++cp, k = ++cur_chunk; |
| 315 | if (k >= NCHUNKS) |
| 316 | bpf_error("out of memory"); |
| 317 | size = CHUNK0SIZE << k; |
| 318 | cp->m = (void *)malloc(size); |
| 319 | if (cp->m == NULL) |
| 320 | bpf_error("out of memory"); |
| 321 | memset((char *)cp->m, 0, size); |
| 322 | cp->n_left = size; |
| 323 | if (n > size) |
| 324 | bpf_error("out of memory"); |
| 325 | } |
| 326 | cp->n_left -= n; |
| 327 | return (void *)((char *)cp->m + cp->n_left); |
| 328 | } |
| 329 | |
| 330 | static void |
| 331 | freechunks() |
| 332 | { |
| 333 | int i; |
| 334 | |
| 335 | cur_chunk = 0; |
| 336 | for (i = 0; i < NCHUNKS; ++i) |
| 337 | if (chunks[i].m != NULL) { |
| 338 | free(chunks[i].m); |
| 339 | chunks[i].m = NULL; |
| 340 | } |
| 341 | } |
| 342 | |
| 343 | /* |
| 344 | * A strdup whose allocations are freed after code generation is over. |
| 345 | */ |
| 346 | char * |
| 347 | sdup(s) |
| 348 | register const char *s; |
| 349 | { |
| 350 | int n = strlen(s) + 1; |
| 351 | char *cp = newchunk(n); |
| 352 | |
| 353 | strlcpy(cp, s, n); |
| 354 | return (cp); |
| 355 | } |
| 356 | |
| 357 | static inline struct block * |
| 358 | new_block(code) |
| 359 | int code; |
| 360 | { |
| 361 | struct block *p; |
| 362 | |
| 363 | p = (struct block *)newchunk(sizeof(*p)); |
| 364 | p->s.code = code; |
| 365 | p->head = p; |
| 366 | |
| 367 | return p; |
| 368 | } |
| 369 | |
| 370 | static inline struct slist * |
| 371 | new_stmt(code) |
| 372 | int code; |
| 373 | { |
| 374 | struct slist *p; |
| 375 | |
| 376 | p = (struct slist *)newchunk(sizeof(*p)); |
| 377 | p->s.code = code; |
| 378 | |
| 379 | return p; |
| 380 | } |
| 381 | |
| 382 | static struct block * |
| 383 | gen_retblk(v) |
| 384 | int v; |
| 385 | { |
| 386 | struct block *b = new_block(BPF_RET|BPF_K); |
| 387 | |
| 388 | b->s.k = v; |
| 389 | return b; |
| 390 | } |
| 391 | |
| 392 | static inline void |
| 393 | syntax() |
| 394 | { |
| 395 | bpf_error("syntax error in filter expression"); |
| 396 | } |
| 397 | |
| 398 | static bpf_u_int32 netmask; |
| 399 | static int snaplen; |
| 400 | int no_optimize; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 401 | #ifdef WIN32 |
| 402 | static int |
| 403 | pcap_compile_unsafe(pcap_t *p, struct bpf_program *program, |
| 404 | const char *buf, int optimize, bpf_u_int32 mask); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 405 | |
| 406 | int |
| 407 | pcap_compile(pcap_t *p, struct bpf_program *program, |
| 408 | const char *buf, int optimize, bpf_u_int32 mask) |
| 409 | { |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 410 | int result; |
| 411 | |
| 412 | EnterCriticalSection(&g_PcapCompileCriticalSection); |
| 413 | |
| 414 | result = pcap_compile_unsafe(p, program, buf, optimize, mask); |
| 415 | |
| 416 | LeaveCriticalSection(&g_PcapCompileCriticalSection); |
| 417 | |
| 418 | return result; |
| 419 | } |
| 420 | |
| 421 | static int |
| 422 | pcap_compile_unsafe(pcap_t *p, struct bpf_program *program, |
| 423 | const char *buf, int optimize, bpf_u_int32 mask) |
| 424 | #else /* WIN32 */ |
| 425 | int |
| 426 | pcap_compile(pcap_t *p, struct bpf_program *program, |
| 427 | const char *buf, int optimize, bpf_u_int32 mask) |
| 428 | #endif /* WIN32 */ |
| 429 | { |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 430 | extern int n_errors; |
| 431 | const char * volatile xbuf = buf; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 432 | u_int len; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 433 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 434 | /* |
| 435 | * If this pcap_t hasn't been activated, it doesn't have a |
| 436 | * link-layer type, so we can't use it. |
| 437 | */ |
| 438 | if (!p->activated) { |
| 439 | snprintf(p->errbuf, PCAP_ERRBUF_SIZE, |
| 440 | "not-yet-activated pcap_t passed to pcap_compile"); |
| 441 | return (-1); |
| 442 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 443 | no_optimize = 0; |
| 444 | n_errors = 0; |
| 445 | root = NULL; |
| 446 | bpf_pcap = p; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 447 | init_regs(); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 448 | if (setjmp(top_ctx)) { |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 449 | #ifdef INET6 |
| 450 | if (ai != NULL) { |
| 451 | freeaddrinfo(ai); |
| 452 | ai = NULL; |
| 453 | } |
| 454 | #endif |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 455 | lex_cleanup(); |
| 456 | freechunks(); |
| 457 | return (-1); |
| 458 | } |
| 459 | |
| 460 | netmask = mask; |
| 461 | |
| 462 | snaplen = pcap_snapshot(p); |
| 463 | if (snaplen == 0) { |
| 464 | snprintf(p->errbuf, PCAP_ERRBUF_SIZE, |
| 465 | "snaplen of 0 rejects all packets"); |
| 466 | return -1; |
| 467 | } |
| 468 | |
| 469 | lex_init(xbuf ? xbuf : ""); |
| 470 | init_linktype(p); |
| 471 | (void)pcap_parse(); |
| 472 | |
| 473 | if (n_errors) |
| 474 | syntax(); |
| 475 | |
| 476 | if (root == NULL) |
| 477 | root = gen_retblk(snaplen); |
| 478 | |
| 479 | if (optimize && !no_optimize) { |
| 480 | bpf_optimize(&root); |
| 481 | if (root == NULL || |
| 482 | (root->s.code == (BPF_RET|BPF_K) && root->s.k == 0)) |
| 483 | bpf_error("expression rejects all packets"); |
| 484 | } |
| 485 | program->bf_insns = icode_to_fcode(root, &len); |
| 486 | program->bf_len = len; |
| 487 | |
| 488 | lex_cleanup(); |
| 489 | freechunks(); |
| 490 | return (0); |
| 491 | } |
| 492 | |
| 493 | /* |
| 494 | * entry point for using the compiler with no pcap open |
| 495 | * pass in all the stuff that is needed explicitly instead. |
| 496 | */ |
| 497 | int |
| 498 | pcap_compile_nopcap(int snaplen_arg, int linktype_arg, |
| 499 | struct bpf_program *program, |
| 500 | const char *buf, int optimize, bpf_u_int32 mask) |
| 501 | { |
| 502 | pcap_t *p; |
| 503 | int ret; |
| 504 | |
| 505 | p = pcap_open_dead(linktype_arg, snaplen_arg); |
| 506 | if (p == NULL) |
| 507 | return (-1); |
| 508 | ret = pcap_compile(p, program, buf, optimize, mask); |
| 509 | pcap_close(p); |
| 510 | return (ret); |
| 511 | } |
| 512 | |
| 513 | /* |
| 514 | * Clean up a "struct bpf_program" by freeing all the memory allocated |
| 515 | * in it. |
| 516 | */ |
| 517 | void |
| 518 | pcap_freecode(struct bpf_program *program) |
| 519 | { |
| 520 | program->bf_len = 0; |
| 521 | if (program->bf_insns != NULL) { |
| 522 | free((char *)program->bf_insns); |
| 523 | program->bf_insns = NULL; |
| 524 | } |
| 525 | } |
| 526 | |
| 527 | /* |
| 528 | * Backpatch the blocks in 'list' to 'target'. The 'sense' field indicates |
| 529 | * which of the jt and jf fields has been resolved and which is a pointer |
| 530 | * back to another unresolved block (or nil). At least one of the fields |
| 531 | * in each block is already resolved. |
| 532 | */ |
| 533 | static void |
| 534 | backpatch(list, target) |
| 535 | struct block *list, *target; |
| 536 | { |
| 537 | struct block *next; |
| 538 | |
| 539 | while (list) { |
| 540 | if (!list->sense) { |
| 541 | next = JT(list); |
| 542 | JT(list) = target; |
| 543 | } else { |
| 544 | next = JF(list); |
| 545 | JF(list) = target; |
| 546 | } |
| 547 | list = next; |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | /* |
| 552 | * Merge the lists in b0 and b1, using the 'sense' field to indicate |
| 553 | * which of jt and jf is the link. |
| 554 | */ |
| 555 | static void |
| 556 | merge(b0, b1) |
| 557 | struct block *b0, *b1; |
| 558 | { |
| 559 | register struct block **p = &b0; |
| 560 | |
| 561 | /* Find end of list. */ |
| 562 | while (*p) |
| 563 | p = !((*p)->sense) ? &JT(*p) : &JF(*p); |
| 564 | |
| 565 | /* Concatenate the lists. */ |
| 566 | *p = b1; |
| 567 | } |
| 568 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 569 | void |
| 570 | finish_parse(p) |
| 571 | struct block *p; |
| 572 | { |
| 573 | struct block *ppi_dlt_check; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 574 | |
| 575 | /* |
| 576 | * Insert before the statements of the first (root) block any |
| 577 | * statements needed to load the lengths of any variable-length |
| 578 | * headers into registers. |
| 579 | * |
| 580 | * XXX - a fancier strategy would be to insert those before the |
| 581 | * statements of all blocks that use those lengths and that |
| 582 | * have no predecessors that use them, so that we only compute |
| 583 | * the lengths if we need them. There might be even better |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 584 | * approaches than that. |
| 585 | * |
| 586 | * However, those strategies would be more complicated, and |
| 587 | * as we don't generate code to compute a length if the |
| 588 | * program has no tests that use the length, and as most |
| 589 | * tests will probably use those lengths, we would just |
| 590 | * postpone computing the lengths so that it's not done |
| 591 | * for tests that fail early, and it's not clear that's |
| 592 | * worth the effort. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 593 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 594 | insert_compute_vloffsets(p->head); |
| 595 | |
| 596 | /* |
| 597 | * For DLT_PPI captures, generate a check of the per-packet |
| 598 | * DLT value to make sure it's DLT_IEEE802_11. |
| 599 | */ |
| 600 | ppi_dlt_check = gen_ppi_dlt_check(); |
| 601 | if (ppi_dlt_check != NULL) |
| 602 | gen_and(ppi_dlt_check, p); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 603 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 604 | backpatch(p, gen_retblk(snaplen)); |
| 605 | p->sense = !p->sense; |
| 606 | backpatch(p, gen_retblk(0)); |
| 607 | root = p->head; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 608 | } |
| 609 | |
| 610 | void |
| 611 | gen_and(b0, b1) |
| 612 | struct block *b0, *b1; |
| 613 | { |
| 614 | backpatch(b0, b1->head); |
| 615 | b0->sense = !b0->sense; |
| 616 | b1->sense = !b1->sense; |
| 617 | merge(b1, b0); |
| 618 | b1->sense = !b1->sense; |
| 619 | b1->head = b0->head; |
| 620 | } |
| 621 | |
| 622 | void |
| 623 | gen_or(b0, b1) |
| 624 | struct block *b0, *b1; |
| 625 | { |
| 626 | b0->sense = !b0->sense; |
| 627 | backpatch(b0, b1->head); |
| 628 | b0->sense = !b0->sense; |
| 629 | merge(b1, b0); |
| 630 | b1->head = b0->head; |
| 631 | } |
| 632 | |
| 633 | void |
| 634 | gen_not(b) |
| 635 | struct block *b; |
| 636 | { |
| 637 | b->sense = !b->sense; |
| 638 | } |
| 639 | |
| 640 | static struct block * |
| 641 | gen_cmp(offrel, offset, size, v) |
| 642 | enum e_offrel offrel; |
| 643 | u_int offset, size; |
| 644 | bpf_int32 v; |
| 645 | { |
| 646 | return gen_ncmp(offrel, offset, size, 0xffffffff, BPF_JEQ, 0, v); |
| 647 | } |
| 648 | |
| 649 | static struct block * |
| 650 | gen_cmp_gt(offrel, offset, size, v) |
| 651 | enum e_offrel offrel; |
| 652 | u_int offset, size; |
| 653 | bpf_int32 v; |
| 654 | { |
| 655 | return gen_ncmp(offrel, offset, size, 0xffffffff, BPF_JGT, 0, v); |
| 656 | } |
| 657 | |
| 658 | static struct block * |
| 659 | gen_cmp_ge(offrel, offset, size, v) |
| 660 | enum e_offrel offrel; |
| 661 | u_int offset, size; |
| 662 | bpf_int32 v; |
| 663 | { |
| 664 | return gen_ncmp(offrel, offset, size, 0xffffffff, BPF_JGE, 0, v); |
| 665 | } |
| 666 | |
| 667 | static struct block * |
| 668 | gen_cmp_lt(offrel, offset, size, v) |
| 669 | enum e_offrel offrel; |
| 670 | u_int offset, size; |
| 671 | bpf_int32 v; |
| 672 | { |
| 673 | return gen_ncmp(offrel, offset, size, 0xffffffff, BPF_JGE, 1, v); |
| 674 | } |
| 675 | |
| 676 | static struct block * |
| 677 | gen_cmp_le(offrel, offset, size, v) |
| 678 | enum e_offrel offrel; |
| 679 | u_int offset, size; |
| 680 | bpf_int32 v; |
| 681 | { |
| 682 | return gen_ncmp(offrel, offset, size, 0xffffffff, BPF_JGT, 1, v); |
| 683 | } |
| 684 | |
| 685 | static struct block * |
| 686 | gen_mcmp(offrel, offset, size, v, mask) |
| 687 | enum e_offrel offrel; |
| 688 | u_int offset, size; |
| 689 | bpf_int32 v; |
| 690 | bpf_u_int32 mask; |
| 691 | { |
| 692 | return gen_ncmp(offrel, offset, size, mask, BPF_JEQ, 0, v); |
| 693 | } |
| 694 | |
| 695 | static struct block * |
| 696 | gen_bcmp(offrel, offset, size, v) |
| 697 | enum e_offrel offrel; |
| 698 | register u_int offset, size; |
| 699 | register const u_char *v; |
| 700 | { |
| 701 | register struct block *b, *tmp; |
| 702 | |
| 703 | b = NULL; |
| 704 | while (size >= 4) { |
| 705 | register const u_char *p = &v[size - 4]; |
| 706 | bpf_int32 w = ((bpf_int32)p[0] << 24) | |
| 707 | ((bpf_int32)p[1] << 16) | ((bpf_int32)p[2] << 8) | p[3]; |
| 708 | |
| 709 | tmp = gen_cmp(offrel, offset + size - 4, BPF_W, w); |
| 710 | if (b != NULL) |
| 711 | gen_and(b, tmp); |
| 712 | b = tmp; |
| 713 | size -= 4; |
| 714 | } |
| 715 | while (size >= 2) { |
| 716 | register const u_char *p = &v[size - 2]; |
| 717 | bpf_int32 w = ((bpf_int32)p[0] << 8) | p[1]; |
| 718 | |
| 719 | tmp = gen_cmp(offrel, offset + size - 2, BPF_H, w); |
| 720 | if (b != NULL) |
| 721 | gen_and(b, tmp); |
| 722 | b = tmp; |
| 723 | size -= 2; |
| 724 | } |
| 725 | if (size > 0) { |
| 726 | tmp = gen_cmp(offrel, offset, BPF_B, (bpf_int32)v[0]); |
| 727 | if (b != NULL) |
| 728 | gen_and(b, tmp); |
| 729 | b = tmp; |
| 730 | } |
| 731 | return b; |
| 732 | } |
| 733 | |
| 734 | /* |
| 735 | * AND the field of size "size" at offset "offset" relative to the header |
| 736 | * specified by "offrel" with "mask", and compare it with the value "v" |
| 737 | * with the test specified by "jtype"; if "reverse" is true, the test |
| 738 | * should test the opposite of "jtype". |
| 739 | */ |
| 740 | static struct block * |
| 741 | gen_ncmp(offrel, offset, size, mask, jtype, reverse, v) |
| 742 | enum e_offrel offrel; |
| 743 | bpf_int32 v; |
| 744 | bpf_u_int32 offset, size, mask, jtype; |
| 745 | int reverse; |
| 746 | { |
| 747 | struct slist *s, *s2; |
| 748 | struct block *b; |
| 749 | |
| 750 | s = gen_load_a(offrel, offset, size); |
| 751 | |
| 752 | if (mask != 0xffffffff) { |
| 753 | s2 = new_stmt(BPF_ALU|BPF_AND|BPF_K); |
| 754 | s2->s.k = mask; |
| 755 | sappend(s, s2); |
| 756 | } |
| 757 | |
| 758 | b = new_block(JMP(jtype)); |
| 759 | b->stmts = s; |
| 760 | b->s.k = v; |
| 761 | if (reverse && (jtype == BPF_JGT || jtype == BPF_JGE)) |
| 762 | gen_not(b); |
| 763 | return b; |
| 764 | } |
| 765 | |
| 766 | /* |
| 767 | * Various code constructs need to know the layout of the data link |
| 768 | * layer. These variables give the necessary offsets from the beginning |
| 769 | * of the packet data. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 770 | */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 771 | |
| 772 | /* |
| 773 | * This is the offset of the beginning of the link-layer header from |
| 774 | * the beginning of the raw packet data. |
| 775 | * |
| 776 | * It's usually 0, except for 802.11 with a fixed-length radio header. |
| 777 | * (For 802.11 with a variable-length radio header, we have to generate |
| 778 | * code to compute that offset; off_ll is 0 in that case.) |
| 779 | */ |
| 780 | static u_int off_ll; |
| 781 | |
| 782 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 783 | * If there's a variable-length header preceding the link-layer header, |
| 784 | * "reg_off_ll" is the register number for a register containing the |
| 785 | * length of that header, and therefore the offset of the link-layer |
| 786 | * header from the beginning of the raw packet data. Otherwise, |
| 787 | * "reg_off_ll" is -1. |
| 788 | */ |
| 789 | static int reg_off_ll; |
| 790 | |
| 791 | /* |
| 792 | * This is the offset of the beginning of the MAC-layer header from |
| 793 | * the beginning of the link-layer header. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 794 | * It's usually 0, except for ATM LANE, where it's the offset, relative |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 795 | * to the beginning of the raw packet data, of the Ethernet header, and |
| 796 | * for Ethernet with various additional information. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 797 | */ |
| 798 | static u_int off_mac; |
| 799 | |
| 800 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 801 | * This is the offset of the beginning of the MAC-layer payload, |
| 802 | * from the beginning of the raw packet data. |
| 803 | * |
| 804 | * I.e., it's the sum of the length of the link-layer header (without, |
| 805 | * for example, any 802.2 LLC header, so it's the MAC-layer |
| 806 | * portion of that header), plus any prefix preceding the |
| 807 | * link-layer header. |
| 808 | */ |
| 809 | static u_int off_macpl; |
| 810 | |
| 811 | /* |
| 812 | * This is 1 if the offset of the beginning of the MAC-layer payload |
| 813 | * from the beginning of the link-layer header is variable-length. |
| 814 | */ |
| 815 | static int off_macpl_is_variable; |
| 816 | |
| 817 | /* |
| 818 | * If the link layer has variable_length headers, "reg_off_macpl" |
| 819 | * is the register number for a register containing the length of the |
| 820 | * link-layer header plus the length of any variable-length header |
| 821 | * preceding the link-layer header. Otherwise, "reg_off_macpl" |
| 822 | * is -1. |
| 823 | */ |
| 824 | static int reg_off_macpl; |
| 825 | |
| 826 | /* |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 827 | * "off_linktype" is the offset to information in the link-layer header |
| 828 | * giving the packet type. This offset is relative to the beginning |
| 829 | * of the link-layer header (i.e., it doesn't include off_ll). |
| 830 | * |
| 831 | * For Ethernet, it's the offset of the Ethernet type field. |
| 832 | * |
| 833 | * For link-layer types that always use 802.2 headers, it's the |
| 834 | * offset of the LLC header. |
| 835 | * |
| 836 | * For PPP, it's the offset of the PPP type field. |
| 837 | * |
| 838 | * For Cisco HDLC, it's the offset of the CHDLC type field. |
| 839 | * |
| 840 | * For BSD loopback, it's the offset of the AF_ value. |
| 841 | * |
| 842 | * For Linux cooked sockets, it's the offset of the type field. |
| 843 | * |
| 844 | * It's set to -1 for no encapsulation, in which case, IP is assumed. |
| 845 | */ |
| 846 | static u_int off_linktype; |
| 847 | |
| 848 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 849 | * TRUE if "pppoes" appeared in the filter; it causes link-layer type |
| 850 | * checks to check the PPP header, assumed to follow a LAN-style link- |
| 851 | * layer header and a PPPoE session header. |
| 852 | */ |
| 853 | static int is_pppoes = 0; |
| 854 | |
| 855 | /* |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 856 | * TRUE if the link layer includes an ATM pseudo-header. |
| 857 | */ |
| 858 | static int is_atm = 0; |
| 859 | |
| 860 | /* |
| 861 | * TRUE if "lane" appeared in the filter; it causes us to generate |
| 862 | * code that assumes LANE rather than LLC-encapsulated traffic in SunATM. |
| 863 | */ |
| 864 | static int is_lane = 0; |
| 865 | |
| 866 | /* |
| 867 | * These are offsets for the ATM pseudo-header. |
| 868 | */ |
| 869 | static u_int off_vpi; |
| 870 | static u_int off_vci; |
| 871 | static u_int off_proto; |
| 872 | |
| 873 | /* |
| 874 | * These are offsets for the MTP2 fields. |
| 875 | */ |
| 876 | static u_int off_li; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 877 | static u_int off_li_hsl; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 878 | |
| 879 | /* |
| 880 | * These are offsets for the MTP3 fields. |
| 881 | */ |
| 882 | static u_int off_sio; |
| 883 | static u_int off_opc; |
| 884 | static u_int off_dpc; |
| 885 | static u_int off_sls; |
| 886 | |
| 887 | /* |
| 888 | * This is the offset of the first byte after the ATM pseudo_header, |
| 889 | * or -1 if there is no ATM pseudo-header. |
| 890 | */ |
| 891 | static u_int off_payload; |
| 892 | |
| 893 | /* |
| 894 | * These are offsets to the beginning of the network-layer header. |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 895 | * They are relative to the beginning of the MAC-layer payload (i.e., |
| 896 | * they don't include off_ll or off_macpl). |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 897 | * |
| 898 | * If the link layer never uses 802.2 LLC: |
| 899 | * |
| 900 | * "off_nl" and "off_nl_nosnap" are the same. |
| 901 | * |
| 902 | * If the link layer always uses 802.2 LLC: |
| 903 | * |
| 904 | * "off_nl" is the offset if there's a SNAP header following |
| 905 | * the 802.2 header; |
| 906 | * |
| 907 | * "off_nl_nosnap" is the offset if there's no SNAP header. |
| 908 | * |
| 909 | * If the link layer is Ethernet: |
| 910 | * |
| 911 | * "off_nl" is the offset if the packet is an Ethernet II packet |
| 912 | * (we assume no 802.3+802.2+SNAP); |
| 913 | * |
| 914 | * "off_nl_nosnap" is the offset if the packet is an 802.3 packet |
| 915 | * with an 802.2 header following it. |
| 916 | */ |
| 917 | static u_int off_nl; |
| 918 | static u_int off_nl_nosnap; |
| 919 | |
| 920 | static int linktype; |
| 921 | |
| 922 | static void |
| 923 | init_linktype(p) |
| 924 | pcap_t *p; |
| 925 | { |
| 926 | linktype = pcap_datalink(p); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 927 | pcap_fddipad = p->fddipad; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 928 | |
| 929 | /* |
| 930 | * Assume it's not raw ATM with a pseudo-header, for now. |
| 931 | */ |
| 932 | off_mac = 0; |
| 933 | is_atm = 0; |
| 934 | is_lane = 0; |
| 935 | off_vpi = -1; |
| 936 | off_vci = -1; |
| 937 | off_proto = -1; |
| 938 | off_payload = -1; |
| 939 | |
| 940 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 941 | * And that we're not doing PPPoE. |
| 942 | */ |
| 943 | is_pppoes = 0; |
| 944 | |
| 945 | /* |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 946 | * And assume we're not doing SS7. |
| 947 | */ |
| 948 | off_li = -1; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 949 | off_li_hsl = -1; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 950 | off_sio = -1; |
| 951 | off_opc = -1; |
| 952 | off_dpc = -1; |
| 953 | off_sls = -1; |
| 954 | |
| 955 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 956 | * Also assume it's not 802.11. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 957 | */ |
| 958 | off_ll = 0; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 959 | off_macpl = 0; |
| 960 | off_macpl_is_variable = 0; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 961 | |
| 962 | orig_linktype = -1; |
| 963 | orig_nl = -1; |
| 964 | label_stack_depth = 0; |
| 965 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 966 | reg_off_ll = -1; |
| 967 | reg_off_macpl = -1; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 968 | |
| 969 | switch (linktype) { |
| 970 | |
| 971 | case DLT_ARCNET: |
| 972 | off_linktype = 2; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 973 | off_macpl = 6; |
| 974 | off_nl = 0; /* XXX in reality, variable! */ |
| 975 | off_nl_nosnap = 0; /* no 802.2 LLC */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 976 | return; |
| 977 | |
| 978 | case DLT_ARCNET_LINUX: |
| 979 | off_linktype = 4; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 980 | off_macpl = 8; |
| 981 | off_nl = 0; /* XXX in reality, variable! */ |
| 982 | off_nl_nosnap = 0; /* no 802.2 LLC */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 983 | return; |
| 984 | |
| 985 | case DLT_EN10MB: |
| 986 | off_linktype = 12; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 987 | off_macpl = 14; /* Ethernet header length */ |
| 988 | off_nl = 0; /* Ethernet II */ |
| 989 | off_nl_nosnap = 3; /* 802.3+802.2 */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 990 | return; |
| 991 | |
| 992 | case DLT_SLIP: |
| 993 | /* |
| 994 | * SLIP doesn't have a link level type. The 16 byte |
| 995 | * header is hacked into our SLIP driver. |
| 996 | */ |
| 997 | off_linktype = -1; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 998 | off_macpl = 16; |
| 999 | off_nl = 0; |
| 1000 | off_nl_nosnap = 0; /* no 802.2 LLC */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1001 | return; |
| 1002 | |
| 1003 | case DLT_SLIP_BSDOS: |
| 1004 | /* XXX this may be the same as the DLT_PPP_BSDOS case */ |
| 1005 | off_linktype = -1; |
| 1006 | /* XXX end */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1007 | off_macpl = 24; |
| 1008 | off_nl = 0; |
| 1009 | off_nl_nosnap = 0; /* no 802.2 LLC */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1010 | return; |
| 1011 | |
| 1012 | case DLT_NULL: |
| 1013 | case DLT_LOOP: |
| 1014 | off_linktype = 0; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1015 | off_macpl = 4; |
| 1016 | off_nl = 0; |
| 1017 | off_nl_nosnap = 0; /* no 802.2 LLC */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1018 | return; |
| 1019 | |
| 1020 | case DLT_ENC: |
| 1021 | off_linktype = 0; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1022 | off_macpl = 12; |
| 1023 | off_nl = 0; |
| 1024 | off_nl_nosnap = 0; /* no 802.2 LLC */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1025 | return; |
| 1026 | |
| 1027 | case DLT_PPP: |
| 1028 | case DLT_PPP_PPPD: |
| 1029 | case DLT_C_HDLC: /* BSD/OS Cisco HDLC */ |
| 1030 | case DLT_PPP_SERIAL: /* NetBSD sync/async serial PPP */ |
| 1031 | off_linktype = 2; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1032 | off_macpl = 4; |
| 1033 | off_nl = 0; |
| 1034 | off_nl_nosnap = 0; /* no 802.2 LLC */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1035 | return; |
| 1036 | |
| 1037 | case DLT_PPP_ETHER: |
| 1038 | /* |
| 1039 | * This does no include the Ethernet header, and |
| 1040 | * only covers session state. |
| 1041 | */ |
| 1042 | off_linktype = 6; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1043 | off_macpl = 8; |
| 1044 | off_nl = 0; |
| 1045 | off_nl_nosnap = 0; /* no 802.2 LLC */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1046 | return; |
| 1047 | |
| 1048 | case DLT_PPP_BSDOS: |
| 1049 | off_linktype = 5; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1050 | off_macpl = 24; |
| 1051 | off_nl = 0; |
| 1052 | off_nl_nosnap = 0; /* no 802.2 LLC */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1053 | return; |
| 1054 | |
| 1055 | case DLT_FDDI: |
| 1056 | /* |
| 1057 | * FDDI doesn't really have a link-level type field. |
| 1058 | * We set "off_linktype" to the offset of the LLC header. |
| 1059 | * |
| 1060 | * To check for Ethernet types, we assume that SSAP = SNAP |
| 1061 | * is being used and pick out the encapsulated Ethernet type. |
| 1062 | * XXX - should we generate code to check for SNAP? |
| 1063 | */ |
| 1064 | off_linktype = 13; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1065 | off_linktype += pcap_fddipad; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1066 | off_macpl = 13; /* FDDI MAC header length */ |
| 1067 | off_macpl += pcap_fddipad; |
| 1068 | off_nl = 8; /* 802.2+SNAP */ |
| 1069 | off_nl_nosnap = 3; /* 802.2 */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1070 | return; |
| 1071 | |
| 1072 | case DLT_IEEE802: |
| 1073 | /* |
| 1074 | * Token Ring doesn't really have a link-level type field. |
| 1075 | * We set "off_linktype" to the offset of the LLC header. |
| 1076 | * |
| 1077 | * To check for Ethernet types, we assume that SSAP = SNAP |
| 1078 | * is being used and pick out the encapsulated Ethernet type. |
| 1079 | * XXX - should we generate code to check for SNAP? |
| 1080 | * |
| 1081 | * XXX - the header is actually variable-length. |
| 1082 | * Some various Linux patched versions gave 38 |
| 1083 | * as "off_linktype" and 40 as "off_nl"; however, |
| 1084 | * if a token ring packet has *no* routing |
| 1085 | * information, i.e. is not source-routed, the correct |
| 1086 | * values are 20 and 22, as they are in the vanilla code. |
| 1087 | * |
| 1088 | * A packet is source-routed iff the uppermost bit |
| 1089 | * of the first byte of the source address, at an |
| 1090 | * offset of 8, has the uppermost bit set. If the |
| 1091 | * packet is source-routed, the total number of bytes |
| 1092 | * of routing information is 2 plus bits 0x1F00 of |
| 1093 | * the 16-bit value at an offset of 14 (shifted right |
| 1094 | * 8 - figure out which byte that is). |
| 1095 | */ |
| 1096 | off_linktype = 14; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1097 | off_macpl = 14; /* Token Ring MAC header length */ |
| 1098 | off_nl = 8; /* 802.2+SNAP */ |
| 1099 | off_nl_nosnap = 3; /* 802.2 */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1100 | return; |
| 1101 | |
| 1102 | case DLT_IEEE802_11: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1103 | case DLT_PRISM_HEADER: |
| 1104 | case DLT_IEEE802_11_RADIO_AVS: |
| 1105 | case DLT_IEEE802_11_RADIO: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1106 | /* |
| 1107 | * 802.11 doesn't really have a link-level type field. |
| 1108 | * We set "off_linktype" to the offset of the LLC header. |
| 1109 | * |
| 1110 | * To check for Ethernet types, we assume that SSAP = SNAP |
| 1111 | * is being used and pick out the encapsulated Ethernet type. |
| 1112 | * XXX - should we generate code to check for SNAP? |
| 1113 | * |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1114 | * We also handle variable-length radio headers here. |
| 1115 | * The Prism header is in theory variable-length, but in |
| 1116 | * practice it's always 144 bytes long. However, some |
| 1117 | * drivers on Linux use ARPHRD_IEEE80211_PRISM, but |
| 1118 | * sometimes or always supply an AVS header, so we |
| 1119 | * have to check whether the radio header is a Prism |
| 1120 | * header or an AVS header, so, in practice, it's |
| 1121 | * variable-length. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1122 | */ |
| 1123 | off_linktype = 24; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1124 | off_macpl = 0; /* link-layer header is variable-length */ |
| 1125 | off_macpl_is_variable = 1; |
| 1126 | off_nl = 8; /* 802.2+SNAP */ |
| 1127 | off_nl_nosnap = 3; /* 802.2 */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1128 | return; |
| 1129 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1130 | case DLT_PPI: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1131 | /* |
| 1132 | * At the moment we treat PPI the same way that we treat |
| 1133 | * normal Radiotap encoded packets. The difference is in |
| 1134 | * the function that generates the code at the beginning |
| 1135 | * to compute the header length. Since this code generator |
| 1136 | * of PPI supports bare 802.11 encapsulation only (i.e. |
| 1137 | * the encapsulated DLT should be DLT_IEEE802_11) we |
| 1138 | * generate code to check for this too. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1139 | */ |
| 1140 | off_linktype = 24; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1141 | off_macpl = 0; /* link-layer header is variable-length */ |
| 1142 | off_macpl_is_variable = 1; |
| 1143 | off_nl = 8; /* 802.2+SNAP */ |
| 1144 | off_nl_nosnap = 3; /* 802.2 */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1145 | return; |
| 1146 | |
| 1147 | case DLT_ATM_RFC1483: |
| 1148 | case DLT_ATM_CLIP: /* Linux ATM defines this */ |
| 1149 | /* |
| 1150 | * assume routed, non-ISO PDUs |
| 1151 | * (i.e., LLC = 0xAA-AA-03, OUT = 0x00-00-00) |
| 1152 | * |
| 1153 | * XXX - what about ISO PDUs, e.g. CLNP, ISIS, ESIS, |
| 1154 | * or PPP with the PPP NLPID (e.g., PPPoA)? The |
| 1155 | * latter would presumably be treated the way PPPoE |
| 1156 | * should be, so you can do "pppoe and udp port 2049" |
| 1157 | * or "pppoa and tcp port 80" and have it check for |
| 1158 | * PPPo{A,E} and a PPP protocol of IP and.... |
| 1159 | */ |
| 1160 | off_linktype = 0; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1161 | off_macpl = 0; /* packet begins with LLC header */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1162 | off_nl = 8; /* 802.2+SNAP */ |
| 1163 | off_nl_nosnap = 3; /* 802.2 */ |
| 1164 | return; |
| 1165 | |
| 1166 | case DLT_SUNATM: |
| 1167 | /* |
| 1168 | * Full Frontal ATM; you get AALn PDUs with an ATM |
| 1169 | * pseudo-header. |
| 1170 | */ |
| 1171 | is_atm = 1; |
| 1172 | off_vpi = SUNATM_VPI_POS; |
| 1173 | off_vci = SUNATM_VCI_POS; |
| 1174 | off_proto = PROTO_POS; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1175 | off_mac = -1; /* assume LLC-encapsulated, so no MAC-layer header */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1176 | off_payload = SUNATM_PKT_BEGIN_POS; |
| 1177 | off_linktype = off_payload; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1178 | off_macpl = off_payload; /* if LLC-encapsulated */ |
| 1179 | off_nl = 8; /* 802.2+SNAP */ |
| 1180 | off_nl_nosnap = 3; /* 802.2 */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1181 | return; |
| 1182 | |
| 1183 | case DLT_RAW: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1184 | case DLT_IPV4: |
| 1185 | case DLT_IPV6: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1186 | off_linktype = -1; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1187 | off_macpl = 0; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1188 | off_nl = 0; |
| 1189 | off_nl_nosnap = 0; /* no 802.2 LLC */ |
| 1190 | return; |
| 1191 | |
| 1192 | case DLT_LINUX_SLL: /* fake header for Linux cooked socket */ |
| 1193 | off_linktype = 14; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1194 | off_macpl = 16; |
| 1195 | off_nl = 0; |
| 1196 | off_nl_nosnap = 0; /* no 802.2 LLC */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1197 | return; |
| 1198 | |
| 1199 | case DLT_LTALK: |
| 1200 | /* |
| 1201 | * LocalTalk does have a 1-byte type field in the LLAP header, |
| 1202 | * but really it just indicates whether there is a "short" or |
| 1203 | * "long" DDP packet following. |
| 1204 | */ |
| 1205 | off_linktype = -1; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1206 | off_macpl = 0; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1207 | off_nl = 0; |
| 1208 | off_nl_nosnap = 0; /* no 802.2 LLC */ |
| 1209 | return; |
| 1210 | |
| 1211 | case DLT_IP_OVER_FC: |
| 1212 | /* |
| 1213 | * RFC 2625 IP-over-Fibre-Channel doesn't really have a |
| 1214 | * link-level type field. We set "off_linktype" to the |
| 1215 | * offset of the LLC header. |
| 1216 | * |
| 1217 | * To check for Ethernet types, we assume that SSAP = SNAP |
| 1218 | * is being used and pick out the encapsulated Ethernet type. |
| 1219 | * XXX - should we generate code to check for SNAP? RFC |
| 1220 | * 2625 says SNAP should be used. |
| 1221 | */ |
| 1222 | off_linktype = 16; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1223 | off_macpl = 16; |
| 1224 | off_nl = 8; /* 802.2+SNAP */ |
| 1225 | off_nl_nosnap = 3; /* 802.2 */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1226 | return; |
| 1227 | |
| 1228 | case DLT_FRELAY: |
| 1229 | /* |
| 1230 | * XXX - we should set this to handle SNAP-encapsulated |
| 1231 | * frames (NLPID of 0x80). |
| 1232 | */ |
| 1233 | off_linktype = -1; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1234 | off_macpl = 0; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1235 | off_nl = 0; |
| 1236 | off_nl_nosnap = 0; /* no 802.2 LLC */ |
| 1237 | return; |
| 1238 | |
| 1239 | /* |
| 1240 | * the only BPF-interesting FRF.16 frames are non-control frames; |
| 1241 | * Frame Relay has a variable length link-layer |
| 1242 | * so lets start with offset 4 for now and increments later on (FIXME); |
| 1243 | */ |
| 1244 | case DLT_MFR: |
| 1245 | off_linktype = -1; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1246 | off_macpl = 0; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1247 | off_nl = 4; |
| 1248 | off_nl_nosnap = 0; /* XXX - for now -> no 802.2 LLC */ |
| 1249 | return; |
| 1250 | |
| 1251 | case DLT_APPLE_IP_OVER_IEEE1394: |
| 1252 | off_linktype = 16; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1253 | off_macpl = 18; |
| 1254 | off_nl = 0; |
| 1255 | off_nl_nosnap = 0; /* no 802.2 LLC */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1256 | return; |
| 1257 | |
| 1258 | case DLT_SYMANTEC_FIREWALL: |
| 1259 | off_linktype = 6; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1260 | off_macpl = 44; |
| 1261 | off_nl = 0; /* Ethernet II */ |
| 1262 | off_nl_nosnap = 0; /* XXX - what does it do with 802.3 packets? */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1263 | return; |
| 1264 | |
| 1265 | #ifdef HAVE_NET_PFVAR_H |
| 1266 | case DLT_PFLOG: |
| 1267 | off_linktype = 0; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1268 | off_macpl = PFLOG_HDRLEN; |
| 1269 | off_nl = 0; |
| 1270 | off_nl_nosnap = 0; /* no 802.2 LLC */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1271 | return; |
| 1272 | #endif |
| 1273 | |
| 1274 | case DLT_JUNIPER_MFR: |
| 1275 | case DLT_JUNIPER_MLFR: |
| 1276 | case DLT_JUNIPER_MLPPP: |
| 1277 | case DLT_JUNIPER_PPP: |
| 1278 | case DLT_JUNIPER_CHDLC: |
| 1279 | case DLT_JUNIPER_FRELAY: |
| 1280 | off_linktype = 4; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1281 | off_macpl = 4; |
| 1282 | off_nl = 0; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1283 | off_nl_nosnap = -1; /* no 802.2 LLC */ |
| 1284 | return; |
| 1285 | |
| 1286 | case DLT_JUNIPER_ATM1: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1287 | off_linktype = 4; /* in reality variable between 4-8 */ |
| 1288 | off_macpl = 4; /* in reality variable between 4-8 */ |
| 1289 | off_nl = 0; |
| 1290 | off_nl_nosnap = 10; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1291 | return; |
| 1292 | |
| 1293 | case DLT_JUNIPER_ATM2: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1294 | off_linktype = 8; /* in reality variable between 8-12 */ |
| 1295 | off_macpl = 8; /* in reality variable between 8-12 */ |
| 1296 | off_nl = 0; |
| 1297 | off_nl_nosnap = 10; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1298 | return; |
| 1299 | |
| 1300 | /* frames captured on a Juniper PPPoE service PIC |
| 1301 | * contain raw ethernet frames */ |
| 1302 | case DLT_JUNIPER_PPPOE: |
| 1303 | case DLT_JUNIPER_ETHER: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1304 | off_macpl = 14; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1305 | off_linktype = 16; |
| 1306 | off_nl = 18; /* Ethernet II */ |
| 1307 | off_nl_nosnap = 21; /* 802.3+802.2 */ |
| 1308 | return; |
| 1309 | |
| 1310 | case DLT_JUNIPER_PPPOE_ATM: |
| 1311 | off_linktype = 4; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1312 | off_macpl = 6; |
| 1313 | off_nl = 0; |
| 1314 | off_nl_nosnap = -1; /* no 802.2 LLC */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1315 | return; |
| 1316 | |
| 1317 | case DLT_JUNIPER_GGSN: |
| 1318 | off_linktype = 6; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1319 | off_macpl = 12; |
| 1320 | off_nl = 0; |
| 1321 | off_nl_nosnap = -1; /* no 802.2 LLC */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1322 | return; |
| 1323 | |
| 1324 | case DLT_JUNIPER_ES: |
| 1325 | off_linktype = 6; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1326 | off_macpl = -1; /* not really a network layer but raw IP addresses */ |
| 1327 | off_nl = -1; /* not really a network layer but raw IP addresses */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1328 | off_nl_nosnap = -1; /* no 802.2 LLC */ |
| 1329 | return; |
| 1330 | |
| 1331 | case DLT_JUNIPER_MONITOR: |
| 1332 | off_linktype = 12; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1333 | off_macpl = 12; |
| 1334 | off_nl = 0; /* raw IP/IP6 header */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1335 | off_nl_nosnap = -1; /* no 802.2 LLC */ |
| 1336 | return; |
| 1337 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1338 | case DLT_BACNET_MS_TP: |
| 1339 | off_linktype = -1; |
| 1340 | off_macpl = -1; |
| 1341 | off_nl = -1; |
| 1342 | off_nl_nosnap = -1; |
| 1343 | return; |
| 1344 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1345 | case DLT_JUNIPER_SERVICES: |
| 1346 | off_linktype = 12; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1347 | off_macpl = -1; /* L3 proto location dep. on cookie type */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1348 | off_nl = -1; /* L3 proto location dep. on cookie type */ |
| 1349 | off_nl_nosnap = -1; /* no 802.2 LLC */ |
| 1350 | return; |
| 1351 | |
| 1352 | case DLT_JUNIPER_VP: |
| 1353 | off_linktype = 18; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1354 | off_macpl = -1; |
| 1355 | off_nl = -1; |
| 1356 | off_nl_nosnap = -1; |
| 1357 | return; |
| 1358 | |
| 1359 | case DLT_JUNIPER_ST: |
| 1360 | off_linktype = 18; |
| 1361 | off_macpl = -1; |
| 1362 | off_nl = -1; |
| 1363 | off_nl_nosnap = -1; |
| 1364 | return; |
| 1365 | |
| 1366 | case DLT_JUNIPER_ISM: |
| 1367 | off_linktype = 8; |
| 1368 | off_macpl = -1; |
| 1369 | off_nl = -1; |
| 1370 | off_nl_nosnap = -1; |
| 1371 | return; |
| 1372 | |
| 1373 | case DLT_JUNIPER_VS: |
| 1374 | case DLT_JUNIPER_SRX_E2E: |
| 1375 | case DLT_JUNIPER_FIBRECHANNEL: |
| 1376 | case DLT_JUNIPER_ATM_CEMIC: |
| 1377 | off_linktype = 8; |
| 1378 | off_macpl = -1; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1379 | off_nl = -1; |
| 1380 | off_nl_nosnap = -1; |
| 1381 | return; |
| 1382 | |
| 1383 | case DLT_MTP2: |
| 1384 | off_li = 2; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1385 | off_li_hsl = 4; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1386 | off_sio = 3; |
| 1387 | off_opc = 4; |
| 1388 | off_dpc = 4; |
| 1389 | off_sls = 7; |
| 1390 | off_linktype = -1; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1391 | off_macpl = -1; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1392 | off_nl = -1; |
| 1393 | off_nl_nosnap = -1; |
| 1394 | return; |
| 1395 | |
| 1396 | case DLT_MTP2_WITH_PHDR: |
| 1397 | off_li = 6; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1398 | off_li_hsl = 8; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1399 | off_sio = 7; |
| 1400 | off_opc = 8; |
| 1401 | off_dpc = 8; |
| 1402 | off_sls = 11; |
| 1403 | off_linktype = -1; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1404 | off_macpl = -1; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1405 | off_nl = -1; |
| 1406 | off_nl_nosnap = -1; |
| 1407 | return; |
| 1408 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1409 | case DLT_ERF: |
| 1410 | off_li = 22; |
| 1411 | off_li_hsl = 24; |
| 1412 | off_sio = 23; |
| 1413 | off_opc = 24; |
| 1414 | off_dpc = 24; |
| 1415 | off_sls = 27; |
| 1416 | off_linktype = -1; |
| 1417 | off_macpl = -1; |
| 1418 | off_nl = -1; |
| 1419 | off_nl_nosnap = -1; |
| 1420 | return; |
| 1421 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1422 | case DLT_PFSYNC: |
| 1423 | off_linktype = -1; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1424 | off_macpl = 4; |
| 1425 | off_nl = 0; |
| 1426 | off_nl_nosnap = 0; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1427 | return; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1428 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1429 | case DLT_AX25_KISS: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1430 | /* |
| 1431 | * Currently, only raw "link[N:M]" filtering is supported. |
| 1432 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1433 | off_linktype = -1; /* variable, min 15, max 71 steps of 7 */ |
| 1434 | off_macpl = -1; |
| 1435 | off_nl = -1; /* variable, min 16, max 71 steps of 7 */ |
| 1436 | off_nl_nosnap = -1; /* no 802.2 LLC */ |
| 1437 | off_mac = 1; /* step over the kiss length byte */ |
| 1438 | return; |
| 1439 | |
| 1440 | case DLT_IPNET: |
| 1441 | off_linktype = 1; |
| 1442 | off_macpl = 24; /* ipnet header length */ |
| 1443 | off_nl = 0; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1444 | off_nl_nosnap = -1; |
| 1445 | return; |
| 1446 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1447 | case DLT_NETANALYZER: |
| 1448 | off_mac = 4; /* MAC header is past 4-byte pseudo-header */ |
| 1449 | off_linktype = 16; /* includes 4-byte pseudo-header */ |
| 1450 | off_macpl = 18; /* pseudo-header+Ethernet header length */ |
| 1451 | off_nl = 0; /* Ethernet II */ |
| 1452 | off_nl_nosnap = 3; /* 802.3+802.2 */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1453 | return; |
| 1454 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1455 | case DLT_NETANALYZER_TRANSPARENT: |
| 1456 | off_mac = 12; /* MAC header is past 4-byte pseudo-header, preamble, and SFD */ |
| 1457 | off_linktype = 24; /* includes 4-byte pseudo-header+preamble+SFD */ |
| 1458 | off_macpl = 26; /* pseudo-header+preamble+SFD+Ethernet header length */ |
| 1459 | off_nl = 0; /* Ethernet II */ |
| 1460 | off_nl_nosnap = 3; /* 802.3+802.2 */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1461 | return; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1462 | |
| 1463 | default: |
| 1464 | /* |
| 1465 | * For values in the range in which we've assigned new |
| 1466 | * DLT_ values, only raw "link[N:M]" filtering is supported. |
| 1467 | */ |
| 1468 | if (linktype >= DLT_MATCHING_MIN && |
| 1469 | linktype <= DLT_MATCHING_MAX) { |
| 1470 | off_linktype = -1; |
| 1471 | off_macpl = -1; |
| 1472 | off_nl = -1; |
| 1473 | off_nl_nosnap = -1; |
| 1474 | return; |
| 1475 | } |
| 1476 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1477 | } |
| 1478 | bpf_error("unknown data link type %d", linktype); |
| 1479 | /* NOTREACHED */ |
| 1480 | } |
| 1481 | |
| 1482 | /* |
| 1483 | * Load a value relative to the beginning of the link-layer header. |
| 1484 | * The link-layer header doesn't necessarily begin at the beginning |
| 1485 | * of the packet data; there might be a variable-length prefix containing |
| 1486 | * radio information. |
| 1487 | */ |
| 1488 | static struct slist * |
| 1489 | gen_load_llrel(offset, size) |
| 1490 | u_int offset, size; |
| 1491 | { |
| 1492 | struct slist *s, *s2; |
| 1493 | |
| 1494 | s = gen_llprefixlen(); |
| 1495 | |
| 1496 | /* |
| 1497 | * If "s" is non-null, it has code to arrange that the X register |
| 1498 | * contains the length of the prefix preceding the link-layer |
| 1499 | * header. |
| 1500 | * |
| 1501 | * Otherwise, the length of the prefix preceding the link-layer |
| 1502 | * header is "off_ll". |
| 1503 | */ |
| 1504 | if (s != NULL) { |
| 1505 | /* |
| 1506 | * There's a variable-length prefix preceding the |
| 1507 | * link-layer header. "s" points to a list of statements |
| 1508 | * that put the length of that prefix into the X register. |
| 1509 | * do an indirect load, to use the X register as an offset. |
| 1510 | */ |
| 1511 | s2 = new_stmt(BPF_LD|BPF_IND|size); |
| 1512 | s2->s.k = offset; |
| 1513 | sappend(s, s2); |
| 1514 | } else { |
| 1515 | /* |
| 1516 | * There is no variable-length header preceding the |
| 1517 | * link-layer header; add in off_ll, which, if there's |
| 1518 | * a fixed-length header preceding the link-layer header, |
| 1519 | * is the length of that header. |
| 1520 | */ |
| 1521 | s = new_stmt(BPF_LD|BPF_ABS|size); |
| 1522 | s->s.k = offset + off_ll; |
| 1523 | } |
| 1524 | return s; |
| 1525 | } |
| 1526 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1527 | /* |
| 1528 | * Load a value relative to the beginning of the MAC-layer payload. |
| 1529 | */ |
| 1530 | static struct slist * |
| 1531 | gen_load_macplrel(offset, size) |
| 1532 | u_int offset, size; |
| 1533 | { |
| 1534 | struct slist *s, *s2; |
| 1535 | |
| 1536 | s = gen_off_macpl(); |
| 1537 | |
| 1538 | /* |
| 1539 | * If s is non-null, the offset of the MAC-layer payload is |
| 1540 | * variable, and s points to a list of instructions that |
| 1541 | * arrange that the X register contains that offset. |
| 1542 | * |
| 1543 | * Otherwise, the offset of the MAC-layer payload is constant, |
| 1544 | * and is in off_macpl. |
| 1545 | */ |
| 1546 | if (s != NULL) { |
| 1547 | /* |
| 1548 | * The offset of the MAC-layer payload is in the X |
| 1549 | * register. Do an indirect load, to use the X register |
| 1550 | * as an offset. |
| 1551 | */ |
| 1552 | s2 = new_stmt(BPF_LD|BPF_IND|size); |
| 1553 | s2->s.k = offset; |
| 1554 | sappend(s, s2); |
| 1555 | } else { |
| 1556 | /* |
| 1557 | * The offset of the MAC-layer payload is constant, |
| 1558 | * and is in off_macpl; load the value at that offset |
| 1559 | * plus the specified offset. |
| 1560 | */ |
| 1561 | s = new_stmt(BPF_LD|BPF_ABS|size); |
| 1562 | s->s.k = off_macpl + offset; |
| 1563 | } |
| 1564 | return s; |
| 1565 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1566 | |
| 1567 | /* |
| 1568 | * Load a value relative to the beginning of the specified header. |
| 1569 | */ |
| 1570 | static struct slist * |
| 1571 | gen_load_a(offrel, offset, size) |
| 1572 | enum e_offrel offrel; |
| 1573 | u_int offset, size; |
| 1574 | { |
| 1575 | struct slist *s, *s2; |
| 1576 | |
| 1577 | switch (offrel) { |
| 1578 | |
| 1579 | case OR_PACKET: |
| 1580 | s = new_stmt(BPF_LD|BPF_ABS|size); |
| 1581 | s->s.k = offset; |
| 1582 | break; |
| 1583 | |
| 1584 | case OR_LINK: |
| 1585 | s = gen_load_llrel(offset, size); |
| 1586 | break; |
| 1587 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1588 | case OR_MACPL: |
| 1589 | s = gen_load_macplrel(offset, size); |
| 1590 | break; |
| 1591 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1592 | case OR_NET: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1593 | s = gen_load_macplrel(off_nl + offset, size); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1594 | break; |
| 1595 | |
| 1596 | case OR_NET_NOSNAP: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1597 | s = gen_load_macplrel(off_nl_nosnap + offset, size); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1598 | break; |
| 1599 | |
| 1600 | case OR_TRAN_IPV4: |
| 1601 | /* |
| 1602 | * Load the X register with the length of the IPv4 header |
| 1603 | * (plus the offset of the link-layer header, if it's |
| 1604 | * preceded by a variable-length header such as a radio |
| 1605 | * header), in bytes. |
| 1606 | */ |
| 1607 | s = gen_loadx_iphdrlen(); |
| 1608 | |
| 1609 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1610 | * Load the item at {offset of the MAC-layer payload} + |
| 1611 | * {offset, relative to the start of the MAC-layer |
| 1612 | * paylod, of the IPv4 header} + {length of the IPv4 header} + |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1613 | * {specified offset}. |
| 1614 | * |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1615 | * (If the offset of the MAC-layer payload is variable, |
| 1616 | * it's included in the value in the X register, and |
| 1617 | * off_macpl is 0.) |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1618 | */ |
| 1619 | s2 = new_stmt(BPF_LD|BPF_IND|size); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1620 | s2->s.k = off_macpl + off_nl + offset; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1621 | sappend(s, s2); |
| 1622 | break; |
| 1623 | |
| 1624 | case OR_TRAN_IPV6: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1625 | s = gen_load_macplrel(off_nl + 40 + offset, size); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1626 | break; |
| 1627 | |
| 1628 | default: |
| 1629 | abort(); |
| 1630 | return NULL; |
| 1631 | } |
| 1632 | return s; |
| 1633 | } |
| 1634 | |
| 1635 | /* |
| 1636 | * Generate code to load into the X register the sum of the length of |
| 1637 | * the IPv4 header and any variable-length header preceding the link-layer |
| 1638 | * header. |
| 1639 | */ |
| 1640 | static struct slist * |
| 1641 | gen_loadx_iphdrlen() |
| 1642 | { |
| 1643 | struct slist *s, *s2; |
| 1644 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1645 | s = gen_off_macpl(); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1646 | if (s != NULL) { |
| 1647 | /* |
| 1648 | * There's a variable-length prefix preceding the |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1649 | * link-layer header, or the link-layer header is itself |
| 1650 | * variable-length. "s" points to a list of statements |
| 1651 | * that put the offset of the MAC-layer payload into |
| 1652 | * the X register. |
| 1653 | * |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1654 | * The 4*([k]&0xf) addressing mode can't be used, as we |
| 1655 | * don't have a constant offset, so we have to load the |
| 1656 | * value in question into the A register and add to it |
| 1657 | * the value from the X register. |
| 1658 | */ |
| 1659 | s2 = new_stmt(BPF_LD|BPF_IND|BPF_B); |
| 1660 | s2->s.k = off_nl; |
| 1661 | sappend(s, s2); |
| 1662 | s2 = new_stmt(BPF_ALU|BPF_AND|BPF_K); |
| 1663 | s2->s.k = 0xf; |
| 1664 | sappend(s, s2); |
| 1665 | s2 = new_stmt(BPF_ALU|BPF_LSH|BPF_K); |
| 1666 | s2->s.k = 2; |
| 1667 | sappend(s, s2); |
| 1668 | |
| 1669 | /* |
| 1670 | * The A register now contains the length of the |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1671 | * IP header. We need to add to it the offset of |
| 1672 | * the MAC-layer payload, which is still in the X |
| 1673 | * register, and move the result into the X register. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1674 | */ |
| 1675 | sappend(s, new_stmt(BPF_ALU|BPF_ADD|BPF_X)); |
| 1676 | sappend(s, new_stmt(BPF_MISC|BPF_TAX)); |
| 1677 | } else { |
| 1678 | /* |
| 1679 | * There is no variable-length header preceding the |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1680 | * link-layer header, and the link-layer header is |
| 1681 | * fixed-length; load the length of the IPv4 header, |
| 1682 | * which is at an offset of off_nl from the beginning |
| 1683 | * of the MAC-layer payload, and thus at an offset |
| 1684 | * of off_mac_pl + off_nl from the beginning of the |
| 1685 | * raw packet data. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1686 | */ |
| 1687 | s = new_stmt(BPF_LDX|BPF_MSH|BPF_B); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1688 | s->s.k = off_macpl + off_nl; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1689 | } |
| 1690 | return s; |
| 1691 | } |
| 1692 | |
| 1693 | static struct block * |
| 1694 | gen_uncond(rsense) |
| 1695 | int rsense; |
| 1696 | { |
| 1697 | struct block *b; |
| 1698 | struct slist *s; |
| 1699 | |
| 1700 | s = new_stmt(BPF_LD|BPF_IMM); |
| 1701 | s->s.k = !rsense; |
| 1702 | b = new_block(JMP(BPF_JEQ)); |
| 1703 | b->stmts = s; |
| 1704 | |
| 1705 | return b; |
| 1706 | } |
| 1707 | |
| 1708 | static inline struct block * |
| 1709 | gen_true() |
| 1710 | { |
| 1711 | return gen_uncond(1); |
| 1712 | } |
| 1713 | |
| 1714 | static inline struct block * |
| 1715 | gen_false() |
| 1716 | { |
| 1717 | return gen_uncond(0); |
| 1718 | } |
| 1719 | |
| 1720 | /* |
| 1721 | * Byte-swap a 32-bit number. |
| 1722 | * ("htonl()" or "ntohl()" won't work - we want to byte-swap even on |
| 1723 | * big-endian platforms.) |
| 1724 | */ |
| 1725 | #define SWAPLONG(y) \ |
| 1726 | ((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff)) |
| 1727 | |
| 1728 | /* |
| 1729 | * Generate code to match a particular packet type. |
| 1730 | * |
| 1731 | * "proto" is an Ethernet type value, if > ETHERMTU, or an LLC SAP |
| 1732 | * value, if <= ETHERMTU. We use that to determine whether to |
| 1733 | * match the type/length field or to check the type/length field for |
| 1734 | * a value <= ETHERMTU to see whether it's a type field and then do |
| 1735 | * the appropriate test. |
| 1736 | */ |
| 1737 | static struct block * |
| 1738 | gen_ether_linktype(proto) |
| 1739 | register int proto; |
| 1740 | { |
| 1741 | struct block *b0, *b1; |
| 1742 | |
| 1743 | switch (proto) { |
| 1744 | |
| 1745 | case LLCSAP_ISONS: |
| 1746 | case LLCSAP_IP: |
| 1747 | case LLCSAP_NETBEUI: |
| 1748 | /* |
| 1749 | * OSI protocols and NetBEUI always use 802.2 encapsulation, |
| 1750 | * so we check the DSAP and SSAP. |
| 1751 | * |
| 1752 | * LLCSAP_IP checks for IP-over-802.2, rather |
| 1753 | * than IP-over-Ethernet or IP-over-SNAP. |
| 1754 | * |
| 1755 | * XXX - should we check both the DSAP and the |
| 1756 | * SSAP, like this, or should we check just the |
| 1757 | * DSAP, as we do for other types <= ETHERMTU |
| 1758 | * (i.e., other SAP values)? |
| 1759 | */ |
| 1760 | b0 = gen_cmp_gt(OR_LINK, off_linktype, BPF_H, ETHERMTU); |
| 1761 | gen_not(b0); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1762 | b1 = gen_cmp(OR_MACPL, 0, BPF_H, (bpf_int32) |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1763 | ((proto << 8) | proto)); |
| 1764 | gen_and(b0, b1); |
| 1765 | return b1; |
| 1766 | |
| 1767 | case LLCSAP_IPX: |
| 1768 | /* |
| 1769 | * Check for; |
| 1770 | * |
| 1771 | * Ethernet_II frames, which are Ethernet |
| 1772 | * frames with a frame type of ETHERTYPE_IPX; |
| 1773 | * |
| 1774 | * Ethernet_802.3 frames, which are 802.3 |
| 1775 | * frames (i.e., the type/length field is |
| 1776 | * a length field, <= ETHERMTU, rather than |
| 1777 | * a type field) with the first two bytes |
| 1778 | * after the Ethernet/802.3 header being |
| 1779 | * 0xFFFF; |
| 1780 | * |
| 1781 | * Ethernet_802.2 frames, which are 802.3 |
| 1782 | * frames with an 802.2 LLC header and |
| 1783 | * with the IPX LSAP as the DSAP in the LLC |
| 1784 | * header; |
| 1785 | * |
| 1786 | * Ethernet_SNAP frames, which are 802.3 |
| 1787 | * frames with an LLC header and a SNAP |
| 1788 | * header and with an OUI of 0x000000 |
| 1789 | * (encapsulated Ethernet) and a protocol |
| 1790 | * ID of ETHERTYPE_IPX in the SNAP header. |
| 1791 | * |
| 1792 | * XXX - should we generate the same code both |
| 1793 | * for tests for LLCSAP_IPX and for ETHERTYPE_IPX? |
| 1794 | */ |
| 1795 | |
| 1796 | /* |
| 1797 | * This generates code to check both for the |
| 1798 | * IPX LSAP (Ethernet_802.2) and for Ethernet_802.3. |
| 1799 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1800 | b0 = gen_cmp(OR_MACPL, 0, BPF_B, (bpf_int32)LLCSAP_IPX); |
| 1801 | b1 = gen_cmp(OR_MACPL, 0, BPF_H, (bpf_int32)0xFFFF); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1802 | gen_or(b0, b1); |
| 1803 | |
| 1804 | /* |
| 1805 | * Now we add code to check for SNAP frames with |
| 1806 | * ETHERTYPE_IPX, i.e. Ethernet_SNAP. |
| 1807 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1808 | b0 = gen_snap(0x000000, ETHERTYPE_IPX); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1809 | gen_or(b0, b1); |
| 1810 | |
| 1811 | /* |
| 1812 | * Now we generate code to check for 802.3 |
| 1813 | * frames in general. |
| 1814 | */ |
| 1815 | b0 = gen_cmp_gt(OR_LINK, off_linktype, BPF_H, ETHERMTU); |
| 1816 | gen_not(b0); |
| 1817 | |
| 1818 | /* |
| 1819 | * Now add the check for 802.3 frames before the |
| 1820 | * check for Ethernet_802.2 and Ethernet_802.3, |
| 1821 | * as those checks should only be done on 802.3 |
| 1822 | * frames, not on Ethernet frames. |
| 1823 | */ |
| 1824 | gen_and(b0, b1); |
| 1825 | |
| 1826 | /* |
| 1827 | * Now add the check for Ethernet_II frames, and |
| 1828 | * do that before checking for the other frame |
| 1829 | * types. |
| 1830 | */ |
| 1831 | b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, |
| 1832 | (bpf_int32)ETHERTYPE_IPX); |
| 1833 | gen_or(b0, b1); |
| 1834 | return b1; |
| 1835 | |
| 1836 | case ETHERTYPE_ATALK: |
| 1837 | case ETHERTYPE_AARP: |
| 1838 | /* |
| 1839 | * EtherTalk (AppleTalk protocols on Ethernet link |
| 1840 | * layer) may use 802.2 encapsulation. |
| 1841 | */ |
| 1842 | |
| 1843 | /* |
| 1844 | * Check for 802.2 encapsulation (EtherTalk phase 2?); |
| 1845 | * we check for an Ethernet type field less than |
| 1846 | * 1500, which means it's an 802.3 length field. |
| 1847 | */ |
| 1848 | b0 = gen_cmp_gt(OR_LINK, off_linktype, BPF_H, ETHERMTU); |
| 1849 | gen_not(b0); |
| 1850 | |
| 1851 | /* |
| 1852 | * 802.2-encapsulated ETHERTYPE_ATALK packets are |
| 1853 | * SNAP packets with an organization code of |
| 1854 | * 0x080007 (Apple, for Appletalk) and a protocol |
| 1855 | * type of ETHERTYPE_ATALK (Appletalk). |
| 1856 | * |
| 1857 | * 802.2-encapsulated ETHERTYPE_AARP packets are |
| 1858 | * SNAP packets with an organization code of |
| 1859 | * 0x000000 (encapsulated Ethernet) and a protocol |
| 1860 | * type of ETHERTYPE_AARP (Appletalk ARP). |
| 1861 | */ |
| 1862 | if (proto == ETHERTYPE_ATALK) |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1863 | b1 = gen_snap(0x080007, ETHERTYPE_ATALK); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1864 | else /* proto == ETHERTYPE_AARP */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1865 | b1 = gen_snap(0x000000, ETHERTYPE_AARP); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1866 | gen_and(b0, b1); |
| 1867 | |
| 1868 | /* |
| 1869 | * Check for Ethernet encapsulation (Ethertalk |
| 1870 | * phase 1?); we just check for the Ethernet |
| 1871 | * protocol type. |
| 1872 | */ |
| 1873 | b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, (bpf_int32)proto); |
| 1874 | |
| 1875 | gen_or(b0, b1); |
| 1876 | return b1; |
| 1877 | |
| 1878 | default: |
| 1879 | if (proto <= ETHERMTU) { |
| 1880 | /* |
| 1881 | * This is an LLC SAP value, so the frames |
| 1882 | * that match would be 802.2 frames. |
| 1883 | * Check that the frame is an 802.2 frame |
| 1884 | * (i.e., that the length/type field is |
| 1885 | * a length field, <= ETHERMTU) and |
| 1886 | * then check the DSAP. |
| 1887 | */ |
| 1888 | b0 = gen_cmp_gt(OR_LINK, off_linktype, BPF_H, ETHERMTU); |
| 1889 | gen_not(b0); |
| 1890 | b1 = gen_cmp(OR_LINK, off_linktype + 2, BPF_B, |
| 1891 | (bpf_int32)proto); |
| 1892 | gen_and(b0, b1); |
| 1893 | return b1; |
| 1894 | } else { |
| 1895 | /* |
| 1896 | * This is an Ethernet type, so compare |
| 1897 | * the length/type field with it (if |
| 1898 | * the frame is an 802.2 frame, the length |
| 1899 | * field will be <= ETHERMTU, and, as |
| 1900 | * "proto" is > ETHERMTU, this test |
| 1901 | * will fail and the frame won't match, |
| 1902 | * which is what we want). |
| 1903 | */ |
| 1904 | return gen_cmp(OR_LINK, off_linktype, BPF_H, |
| 1905 | (bpf_int32)proto); |
| 1906 | } |
| 1907 | } |
| 1908 | } |
| 1909 | |
| 1910 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1911 | * "proto" is an Ethernet type value and for IPNET, if it is not IPv4 |
| 1912 | * or IPv6 then we have an error. |
| 1913 | */ |
| 1914 | static struct block * |
| 1915 | gen_ipnet_linktype(proto) |
| 1916 | register int proto; |
| 1917 | { |
| 1918 | switch (proto) { |
| 1919 | |
| 1920 | case ETHERTYPE_IP: |
| 1921 | return gen_cmp(OR_LINK, off_linktype, BPF_B, |
| 1922 | (bpf_int32)IPH_AF_INET); |
| 1923 | /* NOTREACHED */ |
| 1924 | |
| 1925 | case ETHERTYPE_IPV6: |
| 1926 | return gen_cmp(OR_LINK, off_linktype, BPF_B, |
| 1927 | (bpf_int32)IPH_AF_INET6); |
| 1928 | /* NOTREACHED */ |
| 1929 | |
| 1930 | default: |
| 1931 | break; |
| 1932 | } |
| 1933 | |
| 1934 | return gen_false(); |
| 1935 | } |
| 1936 | |
| 1937 | /* |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1938 | * Generate code to match a particular packet type. |
| 1939 | * |
| 1940 | * "proto" is an Ethernet type value, if > ETHERMTU, or an LLC SAP |
| 1941 | * value, if <= ETHERMTU. We use that to determine whether to |
| 1942 | * match the type field or to check the type field for the special |
| 1943 | * LINUX_SLL_P_802_2 value and then do the appropriate test. |
| 1944 | */ |
| 1945 | static struct block * |
| 1946 | gen_linux_sll_linktype(proto) |
| 1947 | register int proto; |
| 1948 | { |
| 1949 | struct block *b0, *b1; |
| 1950 | |
| 1951 | switch (proto) { |
| 1952 | |
| 1953 | case LLCSAP_ISONS: |
| 1954 | case LLCSAP_IP: |
| 1955 | case LLCSAP_NETBEUI: |
| 1956 | /* |
| 1957 | * OSI protocols and NetBEUI always use 802.2 encapsulation, |
| 1958 | * so we check the DSAP and SSAP. |
| 1959 | * |
| 1960 | * LLCSAP_IP checks for IP-over-802.2, rather |
| 1961 | * than IP-over-Ethernet or IP-over-SNAP. |
| 1962 | * |
| 1963 | * XXX - should we check both the DSAP and the |
| 1964 | * SSAP, like this, or should we check just the |
| 1965 | * DSAP, as we do for other types <= ETHERMTU |
| 1966 | * (i.e., other SAP values)? |
| 1967 | */ |
| 1968 | b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, LINUX_SLL_P_802_2); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1969 | b1 = gen_cmp(OR_MACPL, 0, BPF_H, (bpf_int32) |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1970 | ((proto << 8) | proto)); |
| 1971 | gen_and(b0, b1); |
| 1972 | return b1; |
| 1973 | |
| 1974 | case LLCSAP_IPX: |
| 1975 | /* |
| 1976 | * Ethernet_II frames, which are Ethernet |
| 1977 | * frames with a frame type of ETHERTYPE_IPX; |
| 1978 | * |
| 1979 | * Ethernet_802.3 frames, which have a frame |
| 1980 | * type of LINUX_SLL_P_802_3; |
| 1981 | * |
| 1982 | * Ethernet_802.2 frames, which are 802.3 |
| 1983 | * frames with an 802.2 LLC header (i.e, have |
| 1984 | * a frame type of LINUX_SLL_P_802_2) and |
| 1985 | * with the IPX LSAP as the DSAP in the LLC |
| 1986 | * header; |
| 1987 | * |
| 1988 | * Ethernet_SNAP frames, which are 802.3 |
| 1989 | * frames with an LLC header and a SNAP |
| 1990 | * header and with an OUI of 0x000000 |
| 1991 | * (encapsulated Ethernet) and a protocol |
| 1992 | * ID of ETHERTYPE_IPX in the SNAP header. |
| 1993 | * |
| 1994 | * First, do the checks on LINUX_SLL_P_802_2 |
| 1995 | * frames; generate the check for either |
| 1996 | * Ethernet_802.2 or Ethernet_SNAP frames, and |
| 1997 | * then put a check for LINUX_SLL_P_802_2 frames |
| 1998 | * before it. |
| 1999 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2000 | b0 = gen_cmp(OR_MACPL, 0, BPF_B, (bpf_int32)LLCSAP_IPX); |
| 2001 | b1 = gen_snap(0x000000, ETHERTYPE_IPX); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2002 | gen_or(b0, b1); |
| 2003 | b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, LINUX_SLL_P_802_2); |
| 2004 | gen_and(b0, b1); |
| 2005 | |
| 2006 | /* |
| 2007 | * Now check for 802.3 frames and OR that with |
| 2008 | * the previous test. |
| 2009 | */ |
| 2010 | b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, LINUX_SLL_P_802_3); |
| 2011 | gen_or(b0, b1); |
| 2012 | |
| 2013 | /* |
| 2014 | * Now add the check for Ethernet_II frames, and |
| 2015 | * do that before checking for the other frame |
| 2016 | * types. |
| 2017 | */ |
| 2018 | b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, |
| 2019 | (bpf_int32)ETHERTYPE_IPX); |
| 2020 | gen_or(b0, b1); |
| 2021 | return b1; |
| 2022 | |
| 2023 | case ETHERTYPE_ATALK: |
| 2024 | case ETHERTYPE_AARP: |
| 2025 | /* |
| 2026 | * EtherTalk (AppleTalk protocols on Ethernet link |
| 2027 | * layer) may use 802.2 encapsulation. |
| 2028 | */ |
| 2029 | |
| 2030 | /* |
| 2031 | * Check for 802.2 encapsulation (EtherTalk phase 2?); |
| 2032 | * we check for the 802.2 protocol type in the |
| 2033 | * "Ethernet type" field. |
| 2034 | */ |
| 2035 | b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, LINUX_SLL_P_802_2); |
| 2036 | |
| 2037 | /* |
| 2038 | * 802.2-encapsulated ETHERTYPE_ATALK packets are |
| 2039 | * SNAP packets with an organization code of |
| 2040 | * 0x080007 (Apple, for Appletalk) and a protocol |
| 2041 | * type of ETHERTYPE_ATALK (Appletalk). |
| 2042 | * |
| 2043 | * 802.2-encapsulated ETHERTYPE_AARP packets are |
| 2044 | * SNAP packets with an organization code of |
| 2045 | * 0x000000 (encapsulated Ethernet) and a protocol |
| 2046 | * type of ETHERTYPE_AARP (Appletalk ARP). |
| 2047 | */ |
| 2048 | if (proto == ETHERTYPE_ATALK) |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2049 | b1 = gen_snap(0x080007, ETHERTYPE_ATALK); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2050 | else /* proto == ETHERTYPE_AARP */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2051 | b1 = gen_snap(0x000000, ETHERTYPE_AARP); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2052 | gen_and(b0, b1); |
| 2053 | |
| 2054 | /* |
| 2055 | * Check for Ethernet encapsulation (Ethertalk |
| 2056 | * phase 1?); we just check for the Ethernet |
| 2057 | * protocol type. |
| 2058 | */ |
| 2059 | b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, (bpf_int32)proto); |
| 2060 | |
| 2061 | gen_or(b0, b1); |
| 2062 | return b1; |
| 2063 | |
| 2064 | default: |
| 2065 | if (proto <= ETHERMTU) { |
| 2066 | /* |
| 2067 | * This is an LLC SAP value, so the frames |
| 2068 | * that match would be 802.2 frames. |
| 2069 | * Check for the 802.2 protocol type |
| 2070 | * in the "Ethernet type" field, and |
| 2071 | * then check the DSAP. |
| 2072 | */ |
| 2073 | b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, |
| 2074 | LINUX_SLL_P_802_2); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2075 | b1 = gen_cmp(OR_LINK, off_macpl, BPF_B, |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2076 | (bpf_int32)proto); |
| 2077 | gen_and(b0, b1); |
| 2078 | return b1; |
| 2079 | } else { |
| 2080 | /* |
| 2081 | * This is an Ethernet type, so compare |
| 2082 | * the length/type field with it (if |
| 2083 | * the frame is an 802.2 frame, the length |
| 2084 | * field will be <= ETHERMTU, and, as |
| 2085 | * "proto" is > ETHERMTU, this test |
| 2086 | * will fail and the frame won't match, |
| 2087 | * which is what we want). |
| 2088 | */ |
| 2089 | return gen_cmp(OR_LINK, off_linktype, BPF_H, |
| 2090 | (bpf_int32)proto); |
| 2091 | } |
| 2092 | } |
| 2093 | } |
| 2094 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2095 | static struct slist * |
| 2096 | gen_load_prism_llprefixlen() |
| 2097 | { |
| 2098 | struct slist *s1, *s2; |
| 2099 | struct slist *sjeq_avs_cookie; |
| 2100 | struct slist *sjcommon; |
| 2101 | |
| 2102 | /* |
| 2103 | * This code is not compatible with the optimizer, as |
| 2104 | * we are generating jmp instructions within a normal |
| 2105 | * slist of instructions |
| 2106 | */ |
| 2107 | no_optimize = 1; |
| 2108 | |
| 2109 | /* |
| 2110 | * Generate code to load the length of the radio header into |
| 2111 | * the register assigned to hold that length, if one has been |
| 2112 | * assigned. (If one hasn't been assigned, no code we've |
| 2113 | * generated uses that prefix, so we don't need to generate any |
| 2114 | * code to load it.) |
| 2115 | * |
| 2116 | * Some Linux drivers use ARPHRD_IEEE80211_PRISM but sometimes |
| 2117 | * or always use the AVS header rather than the Prism header. |
| 2118 | * We load a 4-byte big-endian value at the beginning of the |
| 2119 | * raw packet data, and see whether, when masked with 0xFFFFF000, |
| 2120 | * it's equal to 0x80211000. If so, that indicates that it's |
| 2121 | * an AVS header (the masked-out bits are the version number). |
| 2122 | * Otherwise, it's a Prism header. |
| 2123 | * |
| 2124 | * XXX - the Prism header is also, in theory, variable-length, |
| 2125 | * but no known software generates headers that aren't 144 |
| 2126 | * bytes long. |
| 2127 | */ |
| 2128 | if (reg_off_ll != -1) { |
| 2129 | /* |
| 2130 | * Load the cookie. |
| 2131 | */ |
| 2132 | s1 = new_stmt(BPF_LD|BPF_W|BPF_ABS); |
| 2133 | s1->s.k = 0; |
| 2134 | |
| 2135 | /* |
| 2136 | * AND it with 0xFFFFF000. |
| 2137 | */ |
| 2138 | s2 = new_stmt(BPF_ALU|BPF_AND|BPF_K); |
| 2139 | s2->s.k = 0xFFFFF000; |
| 2140 | sappend(s1, s2); |
| 2141 | |
| 2142 | /* |
| 2143 | * Compare with 0x80211000. |
| 2144 | */ |
| 2145 | sjeq_avs_cookie = new_stmt(JMP(BPF_JEQ)); |
| 2146 | sjeq_avs_cookie->s.k = 0x80211000; |
| 2147 | sappend(s1, sjeq_avs_cookie); |
| 2148 | |
| 2149 | /* |
| 2150 | * If it's AVS: |
| 2151 | * |
| 2152 | * The 4 bytes at an offset of 4 from the beginning of |
| 2153 | * the AVS header are the length of the AVS header. |
| 2154 | * That field is big-endian. |
| 2155 | */ |
| 2156 | s2 = new_stmt(BPF_LD|BPF_W|BPF_ABS); |
| 2157 | s2->s.k = 4; |
| 2158 | sappend(s1, s2); |
| 2159 | sjeq_avs_cookie->s.jt = s2; |
| 2160 | |
| 2161 | /* |
| 2162 | * Now jump to the code to allocate a register |
| 2163 | * into which to save the header length and |
| 2164 | * store the length there. (The "jump always" |
| 2165 | * instruction needs to have the k field set; |
| 2166 | * it's added to the PC, so, as we're jumping |
| 2167 | * over a single instruction, it should be 1.) |
| 2168 | */ |
| 2169 | sjcommon = new_stmt(JMP(BPF_JA)); |
| 2170 | sjcommon->s.k = 1; |
| 2171 | sappend(s1, sjcommon); |
| 2172 | |
| 2173 | /* |
| 2174 | * Now for the code that handles the Prism header. |
| 2175 | * Just load the length of the Prism header (144) |
| 2176 | * into the A register. Have the test for an AVS |
| 2177 | * header branch here if we don't have an AVS header. |
| 2178 | */ |
| 2179 | s2 = new_stmt(BPF_LD|BPF_W|BPF_IMM); |
| 2180 | s2->s.k = 144; |
| 2181 | sappend(s1, s2); |
| 2182 | sjeq_avs_cookie->s.jf = s2; |
| 2183 | |
| 2184 | /* |
| 2185 | * Now allocate a register to hold that value and store |
| 2186 | * it. The code for the AVS header will jump here after |
| 2187 | * loading the length of the AVS header. |
| 2188 | */ |
| 2189 | s2 = new_stmt(BPF_ST); |
| 2190 | s2->s.k = reg_off_ll; |
| 2191 | sappend(s1, s2); |
| 2192 | sjcommon->s.jf = s2; |
| 2193 | |
| 2194 | /* |
| 2195 | * Now move it into the X register. |
| 2196 | */ |
| 2197 | s2 = new_stmt(BPF_MISC|BPF_TAX); |
| 2198 | sappend(s1, s2); |
| 2199 | |
| 2200 | return (s1); |
| 2201 | } else |
| 2202 | return (NULL); |
| 2203 | } |
| 2204 | |
| 2205 | static struct slist * |
| 2206 | gen_load_avs_llprefixlen() |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2207 | { |
| 2208 | struct slist *s1, *s2; |
| 2209 | |
| 2210 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2211 | * Generate code to load the length of the AVS header into |
| 2212 | * the register assigned to hold that length, if one has been |
| 2213 | * assigned. (If one hasn't been assigned, no code we've |
| 2214 | * generated uses that prefix, so we don't need to generate any |
| 2215 | * code to load it.) |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2216 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2217 | if (reg_off_ll != -1) { |
| 2218 | /* |
| 2219 | * The 4 bytes at an offset of 4 from the beginning of |
| 2220 | * the AVS header are the length of the AVS header. |
| 2221 | * That field is big-endian. |
| 2222 | */ |
| 2223 | s1 = new_stmt(BPF_LD|BPF_W|BPF_ABS); |
| 2224 | s1->s.k = 4; |
| 2225 | |
| 2226 | /* |
| 2227 | * Now allocate a register to hold that value and store |
| 2228 | * it. |
| 2229 | */ |
| 2230 | s2 = new_stmt(BPF_ST); |
| 2231 | s2->s.k = reg_off_ll; |
| 2232 | sappend(s1, s2); |
| 2233 | |
| 2234 | /* |
| 2235 | * Now move it into the X register. |
| 2236 | */ |
| 2237 | s2 = new_stmt(BPF_MISC|BPF_TAX); |
| 2238 | sappend(s1, s2); |
| 2239 | |
| 2240 | return (s1); |
| 2241 | } else |
| 2242 | return (NULL); |
| 2243 | } |
| 2244 | |
| 2245 | static struct slist * |
| 2246 | gen_load_radiotap_llprefixlen() |
| 2247 | { |
| 2248 | struct slist *s1, *s2; |
| 2249 | |
| 2250 | /* |
| 2251 | * Generate code to load the length of the radiotap header into |
| 2252 | * the register assigned to hold that length, if one has been |
| 2253 | * assigned. (If one hasn't been assigned, no code we've |
| 2254 | * generated uses that prefix, so we don't need to generate any |
| 2255 | * code to load it.) |
| 2256 | */ |
| 2257 | if (reg_off_ll != -1) { |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2258 | /* |
| 2259 | * The 2 bytes at offsets of 2 and 3 from the beginning |
| 2260 | * of the radiotap header are the length of the radiotap |
| 2261 | * header; unfortunately, it's little-endian, so we have |
| 2262 | * to load it a byte at a time and construct the value. |
| 2263 | */ |
| 2264 | |
| 2265 | /* |
| 2266 | * Load the high-order byte, at an offset of 3, shift it |
| 2267 | * left a byte, and put the result in the X register. |
| 2268 | */ |
| 2269 | s1 = new_stmt(BPF_LD|BPF_B|BPF_ABS); |
| 2270 | s1->s.k = 3; |
| 2271 | s2 = new_stmt(BPF_ALU|BPF_LSH|BPF_K); |
| 2272 | sappend(s1, s2); |
| 2273 | s2->s.k = 8; |
| 2274 | s2 = new_stmt(BPF_MISC|BPF_TAX); |
| 2275 | sappend(s1, s2); |
| 2276 | |
| 2277 | /* |
| 2278 | * Load the next byte, at an offset of 2, and OR the |
| 2279 | * value from the X register into it. |
| 2280 | */ |
| 2281 | s2 = new_stmt(BPF_LD|BPF_B|BPF_ABS); |
| 2282 | sappend(s1, s2); |
| 2283 | s2->s.k = 2; |
| 2284 | s2 = new_stmt(BPF_ALU|BPF_OR|BPF_X); |
| 2285 | sappend(s1, s2); |
| 2286 | |
| 2287 | /* |
| 2288 | * Now allocate a register to hold that value and store |
| 2289 | * it. |
| 2290 | */ |
| 2291 | s2 = new_stmt(BPF_ST); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2292 | s2->s.k = reg_off_ll; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2293 | sappend(s1, s2); |
| 2294 | |
| 2295 | /* |
| 2296 | * Now move it into the X register. |
| 2297 | */ |
| 2298 | s2 = new_stmt(BPF_MISC|BPF_TAX); |
| 2299 | sappend(s1, s2); |
| 2300 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2301 | return (s1); |
| 2302 | } else |
| 2303 | return (NULL); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2304 | } |
| 2305 | |
| 2306 | /* |
| 2307 | * At the moment we treat PPI as normal Radiotap encoded |
| 2308 | * packets. The difference is in the function that generates |
| 2309 | * the code at the beginning to compute the header length. |
| 2310 | * Since this code generator of PPI supports bare 802.11 |
| 2311 | * encapsulation only (i.e. the encapsulated DLT should be |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2312 | * DLT_IEEE802_11) we generate code to check for this too; |
| 2313 | * that's done in finish_parse(). |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2314 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2315 | static struct slist * |
| 2316 | gen_load_ppi_llprefixlen() |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2317 | { |
| 2318 | struct slist *s1, *s2; |
| 2319 | |
| 2320 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2321 | * Generate code to load the length of the radiotap header |
| 2322 | * into the register assigned to hold that length, if one has |
| 2323 | * been assigned. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2324 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2325 | if (reg_off_ll != -1) { |
| 2326 | /* |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2327 | * The 2 bytes at offsets of 2 and 3 from the beginning |
| 2328 | * of the radiotap header are the length of the radiotap |
| 2329 | * header; unfortunately, it's little-endian, so we have |
| 2330 | * to load it a byte at a time and construct the value. |
| 2331 | */ |
| 2332 | |
| 2333 | /* |
| 2334 | * Load the high-order byte, at an offset of 3, shift it |
| 2335 | * left a byte, and put the result in the X register. |
| 2336 | */ |
| 2337 | s1 = new_stmt(BPF_LD|BPF_B|BPF_ABS); |
| 2338 | s1->s.k = 3; |
| 2339 | s2 = new_stmt(BPF_ALU|BPF_LSH|BPF_K); |
| 2340 | sappend(s1, s2); |
| 2341 | s2->s.k = 8; |
| 2342 | s2 = new_stmt(BPF_MISC|BPF_TAX); |
| 2343 | sappend(s1, s2); |
| 2344 | |
| 2345 | /* |
| 2346 | * Load the next byte, at an offset of 2, and OR the |
| 2347 | * value from the X register into it. |
| 2348 | */ |
| 2349 | s2 = new_stmt(BPF_LD|BPF_B|BPF_ABS); |
| 2350 | sappend(s1, s2); |
| 2351 | s2->s.k = 2; |
| 2352 | s2 = new_stmt(BPF_ALU|BPF_OR|BPF_X); |
| 2353 | sappend(s1, s2); |
| 2354 | |
| 2355 | /* |
| 2356 | * Now allocate a register to hold that value and store |
| 2357 | * it. |
| 2358 | */ |
| 2359 | s2 = new_stmt(BPF_ST); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2360 | s2->s.k = reg_off_ll; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2361 | sappend(s1, s2); |
| 2362 | |
| 2363 | /* |
| 2364 | * Now move it into the X register. |
| 2365 | */ |
| 2366 | s2 = new_stmt(BPF_MISC|BPF_TAX); |
| 2367 | sappend(s1, s2); |
| 2368 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2369 | return (s1); |
| 2370 | } else |
| 2371 | return (NULL); |
| 2372 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2373 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2374 | /* |
| 2375 | * Load a value relative to the beginning of the link-layer header after the 802.11 |
| 2376 | * header, i.e. LLC_SNAP. |
| 2377 | * The link-layer header doesn't necessarily begin at the beginning |
| 2378 | * of the packet data; there might be a variable-length prefix containing |
| 2379 | * radio information. |
| 2380 | */ |
| 2381 | static struct slist * |
| 2382 | gen_load_802_11_header_len(struct slist *s, struct slist *snext) |
| 2383 | { |
| 2384 | struct slist *s2; |
| 2385 | struct slist *sjset_data_frame_1; |
| 2386 | struct slist *sjset_data_frame_2; |
| 2387 | struct slist *sjset_qos; |
| 2388 | struct slist *sjset_radiotap_flags; |
| 2389 | struct slist *sjset_radiotap_tsft; |
| 2390 | struct slist *sjset_tsft_datapad, *sjset_notsft_datapad; |
| 2391 | struct slist *s_roundup; |
| 2392 | |
| 2393 | if (reg_off_macpl == -1) { |
| 2394 | /* |
| 2395 | * No register has been assigned to the offset of |
| 2396 | * the MAC-layer payload, which means nobody needs |
| 2397 | * it; don't bother computing it - just return |
| 2398 | * what we already have. |
| 2399 | */ |
| 2400 | return (s); |
| 2401 | } |
| 2402 | |
| 2403 | /* |
| 2404 | * This code is not compatible with the optimizer, as |
| 2405 | * we are generating jmp instructions within a normal |
| 2406 | * slist of instructions |
| 2407 | */ |
| 2408 | no_optimize = 1; |
| 2409 | |
| 2410 | /* |
| 2411 | * If "s" is non-null, it has code to arrange that the X register |
| 2412 | * contains the length of the prefix preceding the link-layer |
| 2413 | * header. |
| 2414 | * |
| 2415 | * Otherwise, the length of the prefix preceding the link-layer |
| 2416 | * header is "off_ll". |
| 2417 | */ |
| 2418 | if (s == NULL) { |
| 2419 | /* |
| 2420 | * There is no variable-length header preceding the |
| 2421 | * link-layer header. |
| 2422 | * |
| 2423 | * Load the length of the fixed-length prefix preceding |
| 2424 | * the link-layer header (if any) into the X register, |
| 2425 | * and store it in the reg_off_macpl register. |
| 2426 | * That length is off_ll. |
| 2427 | */ |
| 2428 | s = new_stmt(BPF_LDX|BPF_IMM); |
| 2429 | s->s.k = off_ll; |
| 2430 | } |
| 2431 | |
| 2432 | /* |
| 2433 | * The X register contains the offset of the beginning of the |
| 2434 | * link-layer header; add 24, which is the minimum length |
| 2435 | * of the MAC header for a data frame, to that, and store it |
| 2436 | * in reg_off_macpl, and then load the Frame Control field, |
| 2437 | * which is at the offset in the X register, with an indexed load. |
| 2438 | */ |
| 2439 | s2 = new_stmt(BPF_MISC|BPF_TXA); |
| 2440 | sappend(s, s2); |
| 2441 | s2 = new_stmt(BPF_ALU|BPF_ADD|BPF_K); |
| 2442 | s2->s.k = 24; |
| 2443 | sappend(s, s2); |
| 2444 | s2 = new_stmt(BPF_ST); |
| 2445 | s2->s.k = reg_off_macpl; |
| 2446 | sappend(s, s2); |
| 2447 | |
| 2448 | s2 = new_stmt(BPF_LD|BPF_IND|BPF_B); |
| 2449 | s2->s.k = 0; |
| 2450 | sappend(s, s2); |
| 2451 | |
| 2452 | /* |
| 2453 | * Check the Frame Control field to see if this is a data frame; |
| 2454 | * a data frame has the 0x08 bit (b3) in that field set and the |
| 2455 | * 0x04 bit (b2) clear. |
| 2456 | */ |
| 2457 | sjset_data_frame_1 = new_stmt(JMP(BPF_JSET)); |
| 2458 | sjset_data_frame_1->s.k = 0x08; |
| 2459 | sappend(s, sjset_data_frame_1); |
| 2460 | |
| 2461 | /* |
| 2462 | * If b3 is set, test b2, otherwise go to the first statement of |
| 2463 | * the rest of the program. |
| 2464 | */ |
| 2465 | sjset_data_frame_1->s.jt = sjset_data_frame_2 = new_stmt(JMP(BPF_JSET)); |
| 2466 | sjset_data_frame_2->s.k = 0x04; |
| 2467 | sappend(s, sjset_data_frame_2); |
| 2468 | sjset_data_frame_1->s.jf = snext; |
| 2469 | |
| 2470 | /* |
| 2471 | * If b2 is not set, this is a data frame; test the QoS bit. |
| 2472 | * Otherwise, go to the first statement of the rest of the |
| 2473 | * program. |
| 2474 | */ |
| 2475 | sjset_data_frame_2->s.jt = snext; |
| 2476 | sjset_data_frame_2->s.jf = sjset_qos = new_stmt(JMP(BPF_JSET)); |
| 2477 | sjset_qos->s.k = 0x80; /* QoS bit */ |
| 2478 | sappend(s, sjset_qos); |
| 2479 | |
| 2480 | /* |
| 2481 | * If it's set, add 2 to reg_off_macpl, to skip the QoS |
| 2482 | * field. |
| 2483 | * Otherwise, go to the first statement of the rest of the |
| 2484 | * program. |
| 2485 | */ |
| 2486 | sjset_qos->s.jt = s2 = new_stmt(BPF_LD|BPF_MEM); |
| 2487 | s2->s.k = reg_off_macpl; |
| 2488 | sappend(s, s2); |
| 2489 | s2 = new_stmt(BPF_ALU|BPF_ADD|BPF_IMM); |
| 2490 | s2->s.k = 2; |
| 2491 | sappend(s, s2); |
| 2492 | s2 = new_stmt(BPF_ST); |
| 2493 | s2->s.k = reg_off_macpl; |
| 2494 | sappend(s, s2); |
| 2495 | |
| 2496 | /* |
| 2497 | * If we have a radiotap header, look at it to see whether |
| 2498 | * there's Atheros padding between the MAC-layer header |
| 2499 | * and the payload. |
| 2500 | * |
| 2501 | * Note: all of the fields in the radiotap header are |
| 2502 | * little-endian, so we byte-swap all of the values |
| 2503 | * we test against, as they will be loaded as big-endian |
| 2504 | * values. |
| 2505 | */ |
| 2506 | if (linktype == DLT_IEEE802_11_RADIO) { |
| 2507 | /* |
| 2508 | * Is the IEEE80211_RADIOTAP_FLAGS bit (0x0000002) set |
| 2509 | * in the presence flag? |
| 2510 | */ |
| 2511 | sjset_qos->s.jf = s2 = new_stmt(BPF_LD|BPF_ABS|BPF_W); |
| 2512 | s2->s.k = 4; |
| 2513 | sappend(s, s2); |
| 2514 | |
| 2515 | sjset_radiotap_flags = new_stmt(JMP(BPF_JSET)); |
| 2516 | sjset_radiotap_flags->s.k = SWAPLONG(0x00000002); |
| 2517 | sappend(s, sjset_radiotap_flags); |
| 2518 | |
| 2519 | /* |
| 2520 | * If not, skip all of this. |
| 2521 | */ |
| 2522 | sjset_radiotap_flags->s.jf = snext; |
| 2523 | |
| 2524 | /* |
| 2525 | * Otherwise, is the IEEE80211_RADIOTAP_TSFT bit set? |
| 2526 | */ |
| 2527 | sjset_radiotap_tsft = sjset_radiotap_flags->s.jt = |
| 2528 | new_stmt(JMP(BPF_JSET)); |
| 2529 | sjset_radiotap_tsft->s.k = SWAPLONG(0x00000001); |
| 2530 | sappend(s, sjset_radiotap_tsft); |
| 2531 | |
| 2532 | /* |
| 2533 | * If IEEE80211_RADIOTAP_TSFT is set, the flags field is |
| 2534 | * at an offset of 16 from the beginning of the raw packet |
| 2535 | * data (8 bytes for the radiotap header and 8 bytes for |
| 2536 | * the TSFT field). |
| 2537 | * |
| 2538 | * Test whether the IEEE80211_RADIOTAP_F_DATAPAD bit (0x20) |
| 2539 | * is set. |
| 2540 | */ |
| 2541 | sjset_radiotap_tsft->s.jt = s2 = new_stmt(BPF_LD|BPF_ABS|BPF_B); |
| 2542 | s2->s.k = 16; |
| 2543 | sappend(s, s2); |
| 2544 | |
| 2545 | sjset_tsft_datapad = new_stmt(JMP(BPF_JSET)); |
| 2546 | sjset_tsft_datapad->s.k = 0x20; |
| 2547 | sappend(s, sjset_tsft_datapad); |
| 2548 | |
| 2549 | /* |
| 2550 | * If IEEE80211_RADIOTAP_TSFT is not set, the flags field is |
| 2551 | * at an offset of 8 from the beginning of the raw packet |
| 2552 | * data (8 bytes for the radiotap header). |
| 2553 | * |
| 2554 | * Test whether the IEEE80211_RADIOTAP_F_DATAPAD bit (0x20) |
| 2555 | * is set. |
| 2556 | */ |
| 2557 | sjset_radiotap_tsft->s.jf = s2 = new_stmt(BPF_LD|BPF_ABS|BPF_B); |
| 2558 | s2->s.k = 8; |
| 2559 | sappend(s, s2); |
| 2560 | |
| 2561 | sjset_notsft_datapad = new_stmt(JMP(BPF_JSET)); |
| 2562 | sjset_notsft_datapad->s.k = 0x20; |
| 2563 | sappend(s, sjset_notsft_datapad); |
| 2564 | |
| 2565 | /* |
| 2566 | * In either case, if IEEE80211_RADIOTAP_F_DATAPAD is |
| 2567 | * set, round the length of the 802.11 header to |
| 2568 | * a multiple of 4. Do that by adding 3 and then |
| 2569 | * dividing by and multiplying by 4, which we do by |
| 2570 | * ANDing with ~3. |
| 2571 | */ |
| 2572 | s_roundup = new_stmt(BPF_LD|BPF_MEM); |
| 2573 | s_roundup->s.k = reg_off_macpl; |
| 2574 | sappend(s, s_roundup); |
| 2575 | s2 = new_stmt(BPF_ALU|BPF_ADD|BPF_IMM); |
| 2576 | s2->s.k = 3; |
| 2577 | sappend(s, s2); |
| 2578 | s2 = new_stmt(BPF_ALU|BPF_AND|BPF_IMM); |
| 2579 | s2->s.k = ~3; |
| 2580 | sappend(s, s2); |
| 2581 | s2 = new_stmt(BPF_ST); |
| 2582 | s2->s.k = reg_off_macpl; |
| 2583 | sappend(s, s2); |
| 2584 | |
| 2585 | sjset_tsft_datapad->s.jt = s_roundup; |
| 2586 | sjset_tsft_datapad->s.jf = snext; |
| 2587 | sjset_notsft_datapad->s.jt = s_roundup; |
| 2588 | sjset_notsft_datapad->s.jf = snext; |
| 2589 | } else |
| 2590 | sjset_qos->s.jf = snext; |
| 2591 | |
| 2592 | return s; |
| 2593 | } |
| 2594 | |
| 2595 | static void |
| 2596 | insert_compute_vloffsets(b) |
| 2597 | struct block *b; |
| 2598 | { |
| 2599 | struct slist *s; |
| 2600 | |
| 2601 | /* |
| 2602 | * For link-layer types that have a variable-length header |
| 2603 | * preceding the link-layer header, generate code to load |
| 2604 | * the offset of the link-layer header into the register |
| 2605 | * assigned to that offset, if any. |
| 2606 | */ |
| 2607 | switch (linktype) { |
| 2608 | |
| 2609 | case DLT_PRISM_HEADER: |
| 2610 | s = gen_load_prism_llprefixlen(); |
| 2611 | break; |
| 2612 | |
| 2613 | case DLT_IEEE802_11_RADIO_AVS: |
| 2614 | s = gen_load_avs_llprefixlen(); |
| 2615 | break; |
| 2616 | |
| 2617 | case DLT_IEEE802_11_RADIO: |
| 2618 | s = gen_load_radiotap_llprefixlen(); |
| 2619 | break; |
| 2620 | |
| 2621 | case DLT_PPI: |
| 2622 | s = gen_load_ppi_llprefixlen(); |
| 2623 | break; |
| 2624 | |
| 2625 | default: |
| 2626 | s = NULL; |
| 2627 | break; |
| 2628 | } |
| 2629 | |
| 2630 | /* |
| 2631 | * For link-layer types that have a variable-length link-layer |
| 2632 | * header, generate code to load the offset of the MAC-layer |
| 2633 | * payload into the register assigned to that offset, if any. |
| 2634 | */ |
| 2635 | switch (linktype) { |
| 2636 | |
| 2637 | case DLT_IEEE802_11: |
| 2638 | case DLT_PRISM_HEADER: |
| 2639 | case DLT_IEEE802_11_RADIO_AVS: |
| 2640 | case DLT_IEEE802_11_RADIO: |
| 2641 | case DLT_PPI: |
| 2642 | s = gen_load_802_11_header_len(s, b->stmts); |
| 2643 | break; |
| 2644 | } |
| 2645 | |
| 2646 | /* |
| 2647 | * If we have any offset-loading code, append all the |
| 2648 | * existing statements in the block to those statements, |
| 2649 | * and make the resulting list the list of statements |
| 2650 | * for the block. |
| 2651 | */ |
| 2652 | if (s != NULL) { |
| 2653 | sappend(s, b->stmts); |
| 2654 | b->stmts = s; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2655 | } |
| 2656 | } |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2657 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2658 | static struct block * |
| 2659 | gen_ppi_dlt_check(void) |
| 2660 | { |
| 2661 | struct slist *s_load_dlt; |
| 2662 | struct block *b; |
| 2663 | |
| 2664 | if (linktype == DLT_PPI) |
| 2665 | { |
| 2666 | /* Create the statements that check for the DLT |
| 2667 | */ |
| 2668 | s_load_dlt = new_stmt(BPF_LD|BPF_W|BPF_ABS); |
| 2669 | s_load_dlt->s.k = 4; |
| 2670 | |
| 2671 | b = new_block(JMP(BPF_JEQ)); |
| 2672 | |
| 2673 | b->stmts = s_load_dlt; |
| 2674 | b->s.k = SWAPLONG(DLT_IEEE802_11); |
| 2675 | } |
| 2676 | else |
| 2677 | { |
| 2678 | b = NULL; |
| 2679 | } |
| 2680 | |
| 2681 | return b; |
| 2682 | } |
| 2683 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2684 | static struct slist * |
| 2685 | gen_prism_llprefixlen(void) |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2686 | { |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2687 | struct slist *s; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2688 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2689 | if (reg_off_ll == -1) { |
| 2690 | /* |
| 2691 | * We haven't yet assigned a register for the length |
| 2692 | * of the radio header; allocate one. |
| 2693 | */ |
| 2694 | reg_off_ll = alloc_reg(); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2695 | } |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2696 | |
| 2697 | /* |
| 2698 | * Load the register containing the radio length |
| 2699 | * into the X register. |
| 2700 | */ |
| 2701 | s = new_stmt(BPF_LDX|BPF_MEM); |
| 2702 | s->s.k = reg_off_ll; |
| 2703 | return s; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2704 | } |
| 2705 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2706 | static struct slist * |
| 2707 | gen_avs_llprefixlen(void) |
| 2708 | { |
| 2709 | struct slist *s; |
| 2710 | |
| 2711 | if (reg_off_ll == -1) { |
| 2712 | /* |
| 2713 | * We haven't yet assigned a register for the length |
| 2714 | * of the AVS header; allocate one. |
| 2715 | */ |
| 2716 | reg_off_ll = alloc_reg(); |
| 2717 | } |
| 2718 | |
| 2719 | /* |
| 2720 | * Load the register containing the AVS length |
| 2721 | * into the X register. |
| 2722 | */ |
| 2723 | s = new_stmt(BPF_LDX|BPF_MEM); |
| 2724 | s->s.k = reg_off_ll; |
| 2725 | return s; |
| 2726 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2727 | |
| 2728 | static struct slist * |
| 2729 | gen_radiotap_llprefixlen(void) |
| 2730 | { |
| 2731 | struct slist *s; |
| 2732 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2733 | if (reg_off_ll == -1) { |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2734 | /* |
| 2735 | * We haven't yet assigned a register for the length |
| 2736 | * of the radiotap header; allocate one. |
| 2737 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2738 | reg_off_ll = alloc_reg(); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2739 | } |
| 2740 | |
| 2741 | /* |
| 2742 | * Load the register containing the radiotap length |
| 2743 | * into the X register. |
| 2744 | */ |
| 2745 | s = new_stmt(BPF_LDX|BPF_MEM); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2746 | s->s.k = reg_off_ll; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2747 | return s; |
| 2748 | } |
| 2749 | |
| 2750 | /* |
| 2751 | * At the moment we treat PPI as normal Radiotap encoded |
| 2752 | * packets. The difference is in the function that generates |
| 2753 | * the code at the beginning to compute the header length. |
| 2754 | * Since this code generator of PPI supports bare 802.11 |
| 2755 | * encapsulation only (i.e. the encapsulated DLT should be |
| 2756 | * DLT_IEEE802_11) we generate code to check for this too. |
| 2757 | */ |
| 2758 | static struct slist * |
| 2759 | gen_ppi_llprefixlen(void) |
| 2760 | { |
| 2761 | struct slist *s; |
| 2762 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2763 | if (reg_off_ll == -1) { |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2764 | /* |
| 2765 | * We haven't yet assigned a register for the length |
| 2766 | * of the radiotap header; allocate one. |
| 2767 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2768 | reg_off_ll = alloc_reg(); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2769 | } |
| 2770 | |
| 2771 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2772 | * Load the register containing the PPI length |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2773 | * into the X register. |
| 2774 | */ |
| 2775 | s = new_stmt(BPF_LDX|BPF_MEM); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2776 | s->s.k = reg_off_ll; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2777 | return s; |
| 2778 | } |
| 2779 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2780 | /* |
| 2781 | * Generate code to compute the link-layer header length, if necessary, |
| 2782 | * putting it into the X register, and to return either a pointer to a |
| 2783 | * "struct slist" for the list of statements in that code, or NULL if |
| 2784 | * no code is necessary. |
| 2785 | */ |
| 2786 | static struct slist * |
| 2787 | gen_llprefixlen(void) |
| 2788 | { |
| 2789 | switch (linktype) { |
| 2790 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2791 | case DLT_PRISM_HEADER: |
| 2792 | return gen_prism_llprefixlen(); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2793 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2794 | case DLT_IEEE802_11_RADIO_AVS: |
| 2795 | return gen_avs_llprefixlen(); |
| 2796 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2797 | case DLT_IEEE802_11_RADIO: |
| 2798 | return gen_radiotap_llprefixlen(); |
| 2799 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2800 | case DLT_PPI: |
| 2801 | return gen_ppi_llprefixlen(); |
| 2802 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2803 | default: |
| 2804 | return NULL; |
| 2805 | } |
| 2806 | } |
| 2807 | |
| 2808 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2809 | * Generate code to load the register containing the offset of the |
| 2810 | * MAC-layer payload into the X register; if no register for that offset |
| 2811 | * has been allocated, allocate it first. |
| 2812 | */ |
| 2813 | static struct slist * |
| 2814 | gen_off_macpl(void) |
| 2815 | { |
| 2816 | struct slist *s; |
| 2817 | |
| 2818 | if (off_macpl_is_variable) { |
| 2819 | if (reg_off_macpl == -1) { |
| 2820 | /* |
| 2821 | * We haven't yet assigned a register for the offset |
| 2822 | * of the MAC-layer payload; allocate one. |
| 2823 | */ |
| 2824 | reg_off_macpl = alloc_reg(); |
| 2825 | } |
| 2826 | |
| 2827 | /* |
| 2828 | * Load the register containing the offset of the MAC-layer |
| 2829 | * payload into the X register. |
| 2830 | */ |
| 2831 | s = new_stmt(BPF_LDX|BPF_MEM); |
| 2832 | s->s.k = reg_off_macpl; |
| 2833 | return s; |
| 2834 | } else { |
| 2835 | /* |
| 2836 | * That offset isn't variable, so we don't need to |
| 2837 | * generate any code. |
| 2838 | */ |
| 2839 | return NULL; |
| 2840 | } |
| 2841 | } |
| 2842 | |
| 2843 | /* |
| 2844 | * Map an Ethernet type to the equivalent PPP type. |
| 2845 | */ |
| 2846 | static int |
| 2847 | ethertype_to_ppptype(proto) |
| 2848 | int proto; |
| 2849 | { |
| 2850 | switch (proto) { |
| 2851 | |
| 2852 | case ETHERTYPE_IP: |
| 2853 | proto = PPP_IP; |
| 2854 | break; |
| 2855 | |
| 2856 | case ETHERTYPE_IPV6: |
| 2857 | proto = PPP_IPV6; |
| 2858 | break; |
| 2859 | |
| 2860 | case ETHERTYPE_DN: |
| 2861 | proto = PPP_DECNET; |
| 2862 | break; |
| 2863 | |
| 2864 | case ETHERTYPE_ATALK: |
| 2865 | proto = PPP_APPLE; |
| 2866 | break; |
| 2867 | |
| 2868 | case ETHERTYPE_NS: |
| 2869 | proto = PPP_NS; |
| 2870 | break; |
| 2871 | |
| 2872 | case LLCSAP_ISONS: |
| 2873 | proto = PPP_OSI; |
| 2874 | break; |
| 2875 | |
| 2876 | case LLCSAP_8021D: |
| 2877 | /* |
| 2878 | * I'm assuming the "Bridging PDU"s that go |
| 2879 | * over PPP are Spanning Tree Protocol |
| 2880 | * Bridging PDUs. |
| 2881 | */ |
| 2882 | proto = PPP_BRPDU; |
| 2883 | break; |
| 2884 | |
| 2885 | case LLCSAP_IPX: |
| 2886 | proto = PPP_IPX; |
| 2887 | break; |
| 2888 | } |
| 2889 | return (proto); |
| 2890 | } |
| 2891 | |
| 2892 | /* |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2893 | * Generate code to match a particular packet type by matching the |
| 2894 | * link-layer type field or fields in the 802.2 LLC header. |
| 2895 | * |
| 2896 | * "proto" is an Ethernet type value, if > ETHERMTU, or an LLC SAP |
| 2897 | * value, if <= ETHERMTU. |
| 2898 | */ |
| 2899 | static struct block * |
| 2900 | gen_linktype(proto) |
| 2901 | register int proto; |
| 2902 | { |
| 2903 | struct block *b0, *b1, *b2; |
| 2904 | |
| 2905 | /* are we checking MPLS-encapsulated packets? */ |
| 2906 | if (label_stack_depth > 0) { |
| 2907 | switch (proto) { |
| 2908 | case ETHERTYPE_IP: |
| 2909 | case PPP_IP: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2910 | /* FIXME add other L3 proto IDs */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2911 | return gen_mpls_linktype(Q_IP); |
| 2912 | |
| 2913 | case ETHERTYPE_IPV6: |
| 2914 | case PPP_IPV6: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2915 | /* FIXME add other L3 proto IDs */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2916 | return gen_mpls_linktype(Q_IPV6); |
| 2917 | |
| 2918 | default: |
| 2919 | bpf_error("unsupported protocol over mpls"); |
| 2920 | /* NOTREACHED */ |
| 2921 | } |
| 2922 | } |
| 2923 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2924 | /* |
| 2925 | * Are we testing PPPoE packets? |
| 2926 | */ |
| 2927 | if (is_pppoes) { |
| 2928 | /* |
| 2929 | * The PPPoE session header is part of the |
| 2930 | * MAC-layer payload, so all references |
| 2931 | * should be relative to the beginning of |
| 2932 | * that payload. |
| 2933 | */ |
| 2934 | |
| 2935 | /* |
| 2936 | * We use Ethernet protocol types inside libpcap; |
| 2937 | * map them to the corresponding PPP protocol types. |
| 2938 | */ |
| 2939 | proto = ethertype_to_ppptype(proto); |
| 2940 | return gen_cmp(OR_MACPL, off_linktype, BPF_H, (bpf_int32)proto); |
| 2941 | } |
| 2942 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2943 | switch (linktype) { |
| 2944 | |
| 2945 | case DLT_EN10MB: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2946 | case DLT_NETANALYZER: |
| 2947 | case DLT_NETANALYZER_TRANSPARENT: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2948 | return gen_ether_linktype(proto); |
| 2949 | /*NOTREACHED*/ |
| 2950 | break; |
| 2951 | |
| 2952 | case DLT_C_HDLC: |
| 2953 | switch (proto) { |
| 2954 | |
| 2955 | case LLCSAP_ISONS: |
| 2956 | proto = (proto << 8 | LLCSAP_ISONS); |
| 2957 | /* fall through */ |
| 2958 | |
| 2959 | default: |
| 2960 | return gen_cmp(OR_LINK, off_linktype, BPF_H, |
| 2961 | (bpf_int32)proto); |
| 2962 | /*NOTREACHED*/ |
| 2963 | break; |
| 2964 | } |
| 2965 | break; |
| 2966 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2967 | case DLT_IEEE802_11: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2968 | case DLT_PRISM_HEADER: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2969 | case DLT_IEEE802_11_RADIO_AVS: |
| 2970 | case DLT_IEEE802_11_RADIO: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 2971 | case DLT_PPI: |
| 2972 | /* |
| 2973 | * Check that we have a data frame. |
| 2974 | */ |
| 2975 | b0 = gen_check_802_11_data_frame(); |
| 2976 | |
| 2977 | /* |
| 2978 | * Now check for the specified link-layer type. |
| 2979 | */ |
| 2980 | b1 = gen_llc_linktype(proto); |
| 2981 | gen_and(b0, b1); |
| 2982 | return b1; |
| 2983 | /*NOTREACHED*/ |
| 2984 | break; |
| 2985 | |
| 2986 | case DLT_FDDI: |
| 2987 | /* |
| 2988 | * XXX - check for asynchronous frames, as per RFC 1103. |
| 2989 | */ |
| 2990 | return gen_llc_linktype(proto); |
| 2991 | /*NOTREACHED*/ |
| 2992 | break; |
| 2993 | |
| 2994 | case DLT_IEEE802: |
| 2995 | /* |
| 2996 | * XXX - check for LLC PDUs, as per IEEE 802.5. |
| 2997 | */ |
| 2998 | return gen_llc_linktype(proto); |
| 2999 | /*NOTREACHED*/ |
| 3000 | break; |
| 3001 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3002 | case DLT_ATM_RFC1483: |
| 3003 | case DLT_ATM_CLIP: |
| 3004 | case DLT_IP_OVER_FC: |
| 3005 | return gen_llc_linktype(proto); |
| 3006 | /*NOTREACHED*/ |
| 3007 | break; |
| 3008 | |
| 3009 | case DLT_SUNATM: |
| 3010 | /* |
| 3011 | * If "is_lane" is set, check for a LANE-encapsulated |
| 3012 | * version of this protocol, otherwise check for an |
| 3013 | * LLC-encapsulated version of this protocol. |
| 3014 | * |
| 3015 | * We assume LANE means Ethernet, not Token Ring. |
| 3016 | */ |
| 3017 | if (is_lane) { |
| 3018 | /* |
| 3019 | * Check that the packet doesn't begin with an |
| 3020 | * LE Control marker. (We've already generated |
| 3021 | * a test for LANE.) |
| 3022 | */ |
| 3023 | b0 = gen_cmp(OR_LINK, SUNATM_PKT_BEGIN_POS, BPF_H, |
| 3024 | 0xFF00); |
| 3025 | gen_not(b0); |
| 3026 | |
| 3027 | /* |
| 3028 | * Now generate an Ethernet test. |
| 3029 | */ |
| 3030 | b1 = gen_ether_linktype(proto); |
| 3031 | gen_and(b0, b1); |
| 3032 | return b1; |
| 3033 | } else { |
| 3034 | /* |
| 3035 | * Check for LLC encapsulation and then check the |
| 3036 | * protocol. |
| 3037 | */ |
| 3038 | b0 = gen_atmfield_code(A_PROTOTYPE, PT_LLC, BPF_JEQ, 0); |
| 3039 | b1 = gen_llc_linktype(proto); |
| 3040 | gen_and(b0, b1); |
| 3041 | return b1; |
| 3042 | } |
| 3043 | /*NOTREACHED*/ |
| 3044 | break; |
| 3045 | |
| 3046 | case DLT_LINUX_SLL: |
| 3047 | return gen_linux_sll_linktype(proto); |
| 3048 | /*NOTREACHED*/ |
| 3049 | break; |
| 3050 | |
| 3051 | case DLT_SLIP: |
| 3052 | case DLT_SLIP_BSDOS: |
| 3053 | case DLT_RAW: |
| 3054 | /* |
| 3055 | * These types don't provide any type field; packets |
| 3056 | * are always IPv4 or IPv6. |
| 3057 | * |
| 3058 | * XXX - for IPv4, check for a version number of 4, and, |
| 3059 | * for IPv6, check for a version number of 6? |
| 3060 | */ |
| 3061 | switch (proto) { |
| 3062 | |
| 3063 | case ETHERTYPE_IP: |
| 3064 | /* Check for a version number of 4. */ |
| 3065 | return gen_mcmp(OR_LINK, 0, BPF_B, 0x40, 0xF0); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3066 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3067 | case ETHERTYPE_IPV6: |
| 3068 | /* Check for a version number of 6. */ |
| 3069 | return gen_mcmp(OR_LINK, 0, BPF_B, 0x60, 0xF0); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3070 | |
| 3071 | default: |
| 3072 | return gen_false(); /* always false */ |
| 3073 | } |
| 3074 | /*NOTREACHED*/ |
| 3075 | break; |
| 3076 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3077 | case DLT_IPV4: |
| 3078 | /* |
| 3079 | * Raw IPv4, so no type field. |
| 3080 | */ |
| 3081 | if (proto == ETHERTYPE_IP) |
| 3082 | return gen_true(); /* always true */ |
| 3083 | |
| 3084 | /* Checking for something other than IPv4; always false */ |
| 3085 | return gen_false(); |
| 3086 | /*NOTREACHED*/ |
| 3087 | break; |
| 3088 | |
| 3089 | case DLT_IPV6: |
| 3090 | /* |
| 3091 | * Raw IPv6, so no type field. |
| 3092 | */ |
| 3093 | if (proto == ETHERTYPE_IPV6) |
| 3094 | return gen_true(); /* always true */ |
| 3095 | |
| 3096 | /* Checking for something other than IPv6; always false */ |
| 3097 | return gen_false(); |
| 3098 | /*NOTREACHED*/ |
| 3099 | break; |
| 3100 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3101 | case DLT_PPP: |
| 3102 | case DLT_PPP_PPPD: |
| 3103 | case DLT_PPP_SERIAL: |
| 3104 | case DLT_PPP_ETHER: |
| 3105 | /* |
| 3106 | * We use Ethernet protocol types inside libpcap; |
| 3107 | * map them to the corresponding PPP protocol types. |
| 3108 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3109 | proto = ethertype_to_ppptype(proto); |
| 3110 | return gen_cmp(OR_LINK, off_linktype, BPF_H, (bpf_int32)proto); |
| 3111 | /*NOTREACHED*/ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3112 | break; |
| 3113 | |
| 3114 | case DLT_PPP_BSDOS: |
| 3115 | /* |
| 3116 | * We use Ethernet protocol types inside libpcap; |
| 3117 | * map them to the corresponding PPP protocol types. |
| 3118 | */ |
| 3119 | switch (proto) { |
| 3120 | |
| 3121 | case ETHERTYPE_IP: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3122 | /* |
| 3123 | * Also check for Van Jacobson-compressed IP. |
| 3124 | * XXX - do this for other forms of PPP? |
| 3125 | */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3126 | b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, PPP_IP); |
| 3127 | b1 = gen_cmp(OR_LINK, off_linktype, BPF_H, PPP_VJC); |
| 3128 | gen_or(b0, b1); |
| 3129 | b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, PPP_VJNC); |
| 3130 | gen_or(b1, b0); |
| 3131 | return b0; |
| 3132 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3133 | default: |
| 3134 | proto = ethertype_to_ppptype(proto); |
| 3135 | return gen_cmp(OR_LINK, off_linktype, BPF_H, |
| 3136 | (bpf_int32)proto); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3137 | } |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3138 | /*NOTREACHED*/ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3139 | break; |
| 3140 | |
| 3141 | case DLT_NULL: |
| 3142 | case DLT_LOOP: |
| 3143 | case DLT_ENC: |
| 3144 | /* |
| 3145 | * For DLT_NULL, the link-layer header is a 32-bit |
| 3146 | * word containing an AF_ value in *host* byte order, |
| 3147 | * and for DLT_ENC, the link-layer header begins |
| 3148 | * with a 32-bit work containing an AF_ value in |
| 3149 | * host byte order. |
| 3150 | * |
| 3151 | * In addition, if we're reading a saved capture file, |
| 3152 | * the host byte order in the capture may not be the |
| 3153 | * same as the host byte order on this machine. |
| 3154 | * |
| 3155 | * For DLT_LOOP, the link-layer header is a 32-bit |
| 3156 | * word containing an AF_ value in *network* byte order. |
| 3157 | * |
| 3158 | * XXX - AF_ values may, unfortunately, be platform- |
| 3159 | * dependent; for example, FreeBSD's AF_INET6 is 24 |
| 3160 | * whilst NetBSD's and OpenBSD's is 26. |
| 3161 | * |
| 3162 | * This means that, when reading a capture file, just |
| 3163 | * checking for our AF_INET6 value won't work if the |
| 3164 | * capture file came from another OS. |
| 3165 | */ |
| 3166 | switch (proto) { |
| 3167 | |
| 3168 | case ETHERTYPE_IP: |
| 3169 | proto = AF_INET; |
| 3170 | break; |
| 3171 | |
| 3172 | #ifdef INET6 |
| 3173 | case ETHERTYPE_IPV6: |
| 3174 | proto = AF_INET6; |
| 3175 | break; |
| 3176 | #endif |
| 3177 | |
| 3178 | default: |
| 3179 | /* |
| 3180 | * Not a type on which we support filtering. |
| 3181 | * XXX - support those that have AF_ values |
| 3182 | * #defined on this platform, at least? |
| 3183 | */ |
| 3184 | return gen_false(); |
| 3185 | } |
| 3186 | |
| 3187 | if (linktype == DLT_NULL || linktype == DLT_ENC) { |
| 3188 | /* |
| 3189 | * The AF_ value is in host byte order, but |
| 3190 | * the BPF interpreter will convert it to |
| 3191 | * network byte order. |
| 3192 | * |
| 3193 | * If this is a save file, and it's from a |
| 3194 | * machine with the opposite byte order to |
| 3195 | * ours, we byte-swap the AF_ value. |
| 3196 | * |
| 3197 | * Then we run it through "htonl()", and |
| 3198 | * generate code to compare against the result. |
| 3199 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3200 | if (bpf_pcap->rfile != NULL && bpf_pcap->swapped) |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3201 | proto = SWAPLONG(proto); |
| 3202 | proto = htonl(proto); |
| 3203 | } |
| 3204 | return (gen_cmp(OR_LINK, 0, BPF_W, (bpf_int32)proto)); |
| 3205 | |
| 3206 | #ifdef HAVE_NET_PFVAR_H |
| 3207 | case DLT_PFLOG: |
| 3208 | /* |
| 3209 | * af field is host byte order in contrast to the rest of |
| 3210 | * the packet. |
| 3211 | */ |
| 3212 | if (proto == ETHERTYPE_IP) |
| 3213 | return (gen_cmp(OR_LINK, offsetof(struct pfloghdr, af), |
| 3214 | BPF_B, (bpf_int32)AF_INET)); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3215 | else if (proto == ETHERTYPE_IPV6) |
| 3216 | return (gen_cmp(OR_LINK, offsetof(struct pfloghdr, af), |
| 3217 | BPF_B, (bpf_int32)AF_INET6)); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3218 | else |
| 3219 | return gen_false(); |
| 3220 | /*NOTREACHED*/ |
| 3221 | break; |
| 3222 | #endif /* HAVE_NET_PFVAR_H */ |
| 3223 | |
| 3224 | case DLT_ARCNET: |
| 3225 | case DLT_ARCNET_LINUX: |
| 3226 | /* |
| 3227 | * XXX should we check for first fragment if the protocol |
| 3228 | * uses PHDS? |
| 3229 | */ |
| 3230 | switch (proto) { |
| 3231 | |
| 3232 | default: |
| 3233 | return gen_false(); |
| 3234 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3235 | case ETHERTYPE_IPV6: |
| 3236 | return (gen_cmp(OR_LINK, off_linktype, BPF_B, |
| 3237 | (bpf_int32)ARCTYPE_INET6)); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3238 | |
| 3239 | case ETHERTYPE_IP: |
| 3240 | b0 = gen_cmp(OR_LINK, off_linktype, BPF_B, |
| 3241 | (bpf_int32)ARCTYPE_IP); |
| 3242 | b1 = gen_cmp(OR_LINK, off_linktype, BPF_B, |
| 3243 | (bpf_int32)ARCTYPE_IP_OLD); |
| 3244 | gen_or(b0, b1); |
| 3245 | return (b1); |
| 3246 | |
| 3247 | case ETHERTYPE_ARP: |
| 3248 | b0 = gen_cmp(OR_LINK, off_linktype, BPF_B, |
| 3249 | (bpf_int32)ARCTYPE_ARP); |
| 3250 | b1 = gen_cmp(OR_LINK, off_linktype, BPF_B, |
| 3251 | (bpf_int32)ARCTYPE_ARP_OLD); |
| 3252 | gen_or(b0, b1); |
| 3253 | return (b1); |
| 3254 | |
| 3255 | case ETHERTYPE_REVARP: |
| 3256 | return (gen_cmp(OR_LINK, off_linktype, BPF_B, |
| 3257 | (bpf_int32)ARCTYPE_REVARP)); |
| 3258 | |
| 3259 | case ETHERTYPE_ATALK: |
| 3260 | return (gen_cmp(OR_LINK, off_linktype, BPF_B, |
| 3261 | (bpf_int32)ARCTYPE_ATALK)); |
| 3262 | } |
| 3263 | /*NOTREACHED*/ |
| 3264 | break; |
| 3265 | |
| 3266 | case DLT_LTALK: |
| 3267 | switch (proto) { |
| 3268 | case ETHERTYPE_ATALK: |
| 3269 | return gen_true(); |
| 3270 | default: |
| 3271 | return gen_false(); |
| 3272 | } |
| 3273 | /*NOTREACHED*/ |
| 3274 | break; |
| 3275 | |
| 3276 | case DLT_FRELAY: |
| 3277 | /* |
| 3278 | * XXX - assumes a 2-byte Frame Relay header with |
| 3279 | * DLCI and flags. What if the address is longer? |
| 3280 | */ |
| 3281 | switch (proto) { |
| 3282 | |
| 3283 | case ETHERTYPE_IP: |
| 3284 | /* |
| 3285 | * Check for the special NLPID for IP. |
| 3286 | */ |
| 3287 | return gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | 0xcc); |
| 3288 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3289 | case ETHERTYPE_IPV6: |
| 3290 | /* |
| 3291 | * Check for the special NLPID for IPv6. |
| 3292 | */ |
| 3293 | return gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | 0x8e); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3294 | |
| 3295 | case LLCSAP_ISONS: |
| 3296 | /* |
| 3297 | * Check for several OSI protocols. |
| 3298 | * |
| 3299 | * Frame Relay packets typically have an OSI |
| 3300 | * NLPID at the beginning; we check for each |
| 3301 | * of them. |
| 3302 | * |
| 3303 | * What we check for is the NLPID and a frame |
| 3304 | * control field of UI, i.e. 0x03 followed |
| 3305 | * by the NLPID. |
| 3306 | */ |
| 3307 | b0 = gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | ISO8473_CLNP); |
| 3308 | b1 = gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | ISO9542_ESIS); |
| 3309 | b2 = gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | ISO10589_ISIS); |
| 3310 | gen_or(b1, b2); |
| 3311 | gen_or(b0, b2); |
| 3312 | return b2; |
| 3313 | |
| 3314 | default: |
| 3315 | return gen_false(); |
| 3316 | } |
| 3317 | /*NOTREACHED*/ |
| 3318 | break; |
| 3319 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3320 | case DLT_MFR: |
| 3321 | bpf_error("Multi-link Frame Relay link-layer type filtering not implemented"); |
| 3322 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3323 | case DLT_JUNIPER_MFR: |
| 3324 | case DLT_JUNIPER_MLFR: |
| 3325 | case DLT_JUNIPER_MLPPP: |
| 3326 | case DLT_JUNIPER_ATM1: |
| 3327 | case DLT_JUNIPER_ATM2: |
| 3328 | case DLT_JUNIPER_PPPOE: |
| 3329 | case DLT_JUNIPER_PPPOE_ATM: |
| 3330 | case DLT_JUNIPER_GGSN: |
| 3331 | case DLT_JUNIPER_ES: |
| 3332 | case DLT_JUNIPER_MONITOR: |
| 3333 | case DLT_JUNIPER_SERVICES: |
| 3334 | case DLT_JUNIPER_ETHER: |
| 3335 | case DLT_JUNIPER_PPP: |
| 3336 | case DLT_JUNIPER_FRELAY: |
| 3337 | case DLT_JUNIPER_CHDLC: |
| 3338 | case DLT_JUNIPER_VP: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3339 | case DLT_JUNIPER_ST: |
| 3340 | case DLT_JUNIPER_ISM: |
| 3341 | case DLT_JUNIPER_VS: |
| 3342 | case DLT_JUNIPER_SRX_E2E: |
| 3343 | case DLT_JUNIPER_FIBRECHANNEL: |
| 3344 | case DLT_JUNIPER_ATM_CEMIC: |
| 3345 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3346 | /* just lets verify the magic number for now - |
| 3347 | * on ATM we may have up to 6 different encapsulations on the wire |
| 3348 | * and need a lot of heuristics to figure out that the payload |
| 3349 | * might be; |
| 3350 | * |
| 3351 | * FIXME encapsulation specific BPF_ filters |
| 3352 | */ |
| 3353 | return gen_mcmp(OR_LINK, 0, BPF_W, 0x4d474300, 0xffffff00); /* compare the magic number */ |
| 3354 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3355 | case DLT_BACNET_MS_TP: |
| 3356 | return gen_mcmp(OR_LINK, 0, BPF_W, 0x55FF0000, 0xffff0000); |
| 3357 | |
| 3358 | case DLT_IPNET: |
| 3359 | return gen_ipnet_linktype(proto); |
| 3360 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3361 | case DLT_LINUX_IRDA: |
| 3362 | bpf_error("IrDA link-layer type filtering not implemented"); |
| 3363 | |
| 3364 | case DLT_DOCSIS: |
| 3365 | bpf_error("DOCSIS link-layer type filtering not implemented"); |
| 3366 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3367 | case DLT_MTP2: |
| 3368 | case DLT_MTP2_WITH_PHDR: |
| 3369 | bpf_error("MTP2 link-layer type filtering not implemented"); |
| 3370 | |
| 3371 | case DLT_ERF: |
| 3372 | bpf_error("ERF link-layer type filtering not implemented"); |
| 3373 | |
| 3374 | case DLT_PFSYNC: |
| 3375 | bpf_error("PFSYNC link-layer type filtering not implemented"); |
| 3376 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3377 | case DLT_LINUX_LAPD: |
| 3378 | bpf_error("LAPD link-layer type filtering not implemented"); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3379 | |
| 3380 | case DLT_USB: |
| 3381 | case DLT_USB_LINUX: |
| 3382 | case DLT_USB_LINUX_MMAPPED: |
| 3383 | bpf_error("USB link-layer type filtering not implemented"); |
| 3384 | |
| 3385 | case DLT_BLUETOOTH_HCI_H4: |
| 3386 | case DLT_BLUETOOTH_HCI_H4_WITH_PHDR: |
| 3387 | bpf_error("Bluetooth link-layer type filtering not implemented"); |
| 3388 | |
| 3389 | case DLT_CAN20B: |
| 3390 | case DLT_CAN_SOCKETCAN: |
| 3391 | bpf_error("CAN link-layer type filtering not implemented"); |
| 3392 | |
| 3393 | case DLT_IEEE802_15_4: |
| 3394 | case DLT_IEEE802_15_4_LINUX: |
| 3395 | case DLT_IEEE802_15_4_NONASK_PHY: |
| 3396 | case DLT_IEEE802_15_4_NOFCS: |
| 3397 | bpf_error("IEEE 802.15.4 link-layer type filtering not implemented"); |
| 3398 | |
| 3399 | case DLT_IEEE802_16_MAC_CPS_RADIO: |
| 3400 | bpf_error("IEEE 802.16 link-layer type filtering not implemented"); |
| 3401 | |
| 3402 | case DLT_SITA: |
| 3403 | bpf_error("SITA link-layer type filtering not implemented"); |
| 3404 | |
| 3405 | case DLT_RAIF1: |
| 3406 | bpf_error("RAIF1 link-layer type filtering not implemented"); |
| 3407 | |
| 3408 | case DLT_IPMB: |
| 3409 | bpf_error("IPMB link-layer type filtering not implemented"); |
| 3410 | |
| 3411 | case DLT_AX25_KISS: |
| 3412 | bpf_error("AX.25 link-layer type filtering not implemented"); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3413 | } |
| 3414 | |
| 3415 | /* |
| 3416 | * All the types that have no encapsulation should either be |
| 3417 | * handled as DLT_SLIP, DLT_SLIP_BSDOS, and DLT_RAW are, if |
| 3418 | * all packets are IP packets, or should be handled in some |
| 3419 | * special case, if none of them are (if some are and some |
| 3420 | * aren't, the lack of encapsulation is a problem, as we'd |
| 3421 | * have to find some other way of determining the packet type). |
| 3422 | * |
| 3423 | * Therefore, if "off_linktype" is -1, there's an error. |
| 3424 | */ |
| 3425 | if (off_linktype == (u_int)-1) |
| 3426 | abort(); |
| 3427 | |
| 3428 | /* |
| 3429 | * Any type not handled above should always have an Ethernet |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3430 | * type at an offset of "off_linktype". |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3431 | */ |
| 3432 | return gen_cmp(OR_LINK, off_linktype, BPF_H, (bpf_int32)proto); |
| 3433 | } |
| 3434 | |
| 3435 | /* |
| 3436 | * Check for an LLC SNAP packet with a given organization code and |
| 3437 | * protocol type; we check the entire contents of the 802.2 LLC and |
| 3438 | * snap headers, checking for DSAP and SSAP of SNAP and a control |
| 3439 | * field of 0x03 in the LLC header, and for the specified organization |
| 3440 | * code and protocol type in the SNAP header. |
| 3441 | */ |
| 3442 | static struct block * |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3443 | gen_snap(orgcode, ptype) |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3444 | bpf_u_int32 orgcode; |
| 3445 | bpf_u_int32 ptype; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3446 | { |
| 3447 | u_char snapblock[8]; |
| 3448 | |
| 3449 | snapblock[0] = LLCSAP_SNAP; /* DSAP = SNAP */ |
| 3450 | snapblock[1] = LLCSAP_SNAP; /* SSAP = SNAP */ |
| 3451 | snapblock[2] = 0x03; /* control = UI */ |
| 3452 | snapblock[3] = (orgcode >> 16); /* upper 8 bits of organization code */ |
| 3453 | snapblock[4] = (orgcode >> 8); /* middle 8 bits of organization code */ |
| 3454 | snapblock[5] = (orgcode >> 0); /* lower 8 bits of organization code */ |
| 3455 | snapblock[6] = (ptype >> 8); /* upper 8 bits of protocol type */ |
| 3456 | snapblock[7] = (ptype >> 0); /* lower 8 bits of protocol type */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3457 | return gen_bcmp(OR_MACPL, 0, 8, snapblock); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3458 | } |
| 3459 | |
| 3460 | /* |
| 3461 | * Generate code to match a particular packet type, for link-layer types |
| 3462 | * using 802.2 LLC headers. |
| 3463 | * |
| 3464 | * This is *NOT* used for Ethernet; "gen_ether_linktype()" is used |
| 3465 | * for that - it handles the D/I/X Ethernet vs. 802.3+802.2 issues. |
| 3466 | * |
| 3467 | * "proto" is an Ethernet type value, if > ETHERMTU, or an LLC SAP |
| 3468 | * value, if <= ETHERMTU. We use that to determine whether to |
| 3469 | * match the DSAP or both DSAP and LSAP or to check the OUI and |
| 3470 | * protocol ID in a SNAP header. |
| 3471 | */ |
| 3472 | static struct block * |
| 3473 | gen_llc_linktype(proto) |
| 3474 | int proto; |
| 3475 | { |
| 3476 | /* |
| 3477 | * XXX - handle token-ring variable-length header. |
| 3478 | */ |
| 3479 | switch (proto) { |
| 3480 | |
| 3481 | case LLCSAP_IP: |
| 3482 | case LLCSAP_ISONS: |
| 3483 | case LLCSAP_NETBEUI: |
| 3484 | /* |
| 3485 | * XXX - should we check both the DSAP and the |
| 3486 | * SSAP, like this, or should we check just the |
| 3487 | * DSAP, as we do for other types <= ETHERMTU |
| 3488 | * (i.e., other SAP values)? |
| 3489 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3490 | return gen_cmp(OR_MACPL, 0, BPF_H, (bpf_u_int32) |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3491 | ((proto << 8) | proto)); |
| 3492 | |
| 3493 | case LLCSAP_IPX: |
| 3494 | /* |
| 3495 | * XXX - are there ever SNAP frames for IPX on |
| 3496 | * non-Ethernet 802.x networks? |
| 3497 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3498 | return gen_cmp(OR_MACPL, 0, BPF_B, |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3499 | (bpf_int32)LLCSAP_IPX); |
| 3500 | |
| 3501 | case ETHERTYPE_ATALK: |
| 3502 | /* |
| 3503 | * 802.2-encapsulated ETHERTYPE_ATALK packets are |
| 3504 | * SNAP packets with an organization code of |
| 3505 | * 0x080007 (Apple, for Appletalk) and a protocol |
| 3506 | * type of ETHERTYPE_ATALK (Appletalk). |
| 3507 | * |
| 3508 | * XXX - check for an organization code of |
| 3509 | * encapsulated Ethernet as well? |
| 3510 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3511 | return gen_snap(0x080007, ETHERTYPE_ATALK); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3512 | |
| 3513 | default: |
| 3514 | /* |
| 3515 | * XXX - we don't have to check for IPX 802.3 |
| 3516 | * here, but should we check for the IPX Ethertype? |
| 3517 | */ |
| 3518 | if (proto <= ETHERMTU) { |
| 3519 | /* |
| 3520 | * This is an LLC SAP value, so check |
| 3521 | * the DSAP. |
| 3522 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3523 | return gen_cmp(OR_MACPL, 0, BPF_B, (bpf_int32)proto); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3524 | } else { |
| 3525 | /* |
| 3526 | * This is an Ethernet type; we assume that it's |
| 3527 | * unlikely that it'll appear in the right place |
| 3528 | * at random, and therefore check only the |
| 3529 | * location that would hold the Ethernet type |
| 3530 | * in a SNAP frame with an organization code of |
| 3531 | * 0x000000 (encapsulated Ethernet). |
| 3532 | * |
| 3533 | * XXX - if we were to check for the SNAP DSAP and |
| 3534 | * LSAP, as per XXX, and were also to check for an |
| 3535 | * organization code of 0x000000 (encapsulated |
| 3536 | * Ethernet), we'd do |
| 3537 | * |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3538 | * return gen_snap(0x000000, proto); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3539 | * |
| 3540 | * here; for now, we don't, as per the above. |
| 3541 | * I don't know whether it's worth the extra CPU |
| 3542 | * time to do the right check or not. |
| 3543 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3544 | return gen_cmp(OR_MACPL, 6, BPF_H, (bpf_int32)proto); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3545 | } |
| 3546 | } |
| 3547 | } |
| 3548 | |
| 3549 | static struct block * |
| 3550 | gen_hostop(addr, mask, dir, proto, src_off, dst_off) |
| 3551 | bpf_u_int32 addr; |
| 3552 | bpf_u_int32 mask; |
| 3553 | int dir, proto; |
| 3554 | u_int src_off, dst_off; |
| 3555 | { |
| 3556 | struct block *b0, *b1; |
| 3557 | u_int offset; |
| 3558 | |
| 3559 | switch (dir) { |
| 3560 | |
| 3561 | case Q_SRC: |
| 3562 | offset = src_off; |
| 3563 | break; |
| 3564 | |
| 3565 | case Q_DST: |
| 3566 | offset = dst_off; |
| 3567 | break; |
| 3568 | |
| 3569 | case Q_AND: |
| 3570 | b0 = gen_hostop(addr, mask, Q_SRC, proto, src_off, dst_off); |
| 3571 | b1 = gen_hostop(addr, mask, Q_DST, proto, src_off, dst_off); |
| 3572 | gen_and(b0, b1); |
| 3573 | return b1; |
| 3574 | |
| 3575 | case Q_OR: |
| 3576 | case Q_DEFAULT: |
| 3577 | b0 = gen_hostop(addr, mask, Q_SRC, proto, src_off, dst_off); |
| 3578 | b1 = gen_hostop(addr, mask, Q_DST, proto, src_off, dst_off); |
| 3579 | gen_or(b0, b1); |
| 3580 | return b1; |
| 3581 | |
| 3582 | default: |
| 3583 | abort(); |
| 3584 | } |
| 3585 | b0 = gen_linktype(proto); |
| 3586 | b1 = gen_mcmp(OR_NET, offset, BPF_W, (bpf_int32)addr, mask); |
| 3587 | gen_and(b0, b1); |
| 3588 | return b1; |
| 3589 | } |
| 3590 | |
| 3591 | #ifdef INET6 |
| 3592 | static struct block * |
| 3593 | gen_hostop6(addr, mask, dir, proto, src_off, dst_off) |
| 3594 | struct in6_addr *addr; |
| 3595 | struct in6_addr *mask; |
| 3596 | int dir, proto; |
| 3597 | u_int src_off, dst_off; |
| 3598 | { |
| 3599 | struct block *b0, *b1; |
| 3600 | u_int offset; |
| 3601 | u_int32_t *a, *m; |
| 3602 | |
| 3603 | switch (dir) { |
| 3604 | |
| 3605 | case Q_SRC: |
| 3606 | offset = src_off; |
| 3607 | break; |
| 3608 | |
| 3609 | case Q_DST: |
| 3610 | offset = dst_off; |
| 3611 | break; |
| 3612 | |
| 3613 | case Q_AND: |
| 3614 | b0 = gen_hostop6(addr, mask, Q_SRC, proto, src_off, dst_off); |
| 3615 | b1 = gen_hostop6(addr, mask, Q_DST, proto, src_off, dst_off); |
| 3616 | gen_and(b0, b1); |
| 3617 | return b1; |
| 3618 | |
| 3619 | case Q_OR: |
| 3620 | case Q_DEFAULT: |
| 3621 | b0 = gen_hostop6(addr, mask, Q_SRC, proto, src_off, dst_off); |
| 3622 | b1 = gen_hostop6(addr, mask, Q_DST, proto, src_off, dst_off); |
| 3623 | gen_or(b0, b1); |
| 3624 | return b1; |
| 3625 | |
| 3626 | default: |
| 3627 | abort(); |
| 3628 | } |
| 3629 | /* this order is important */ |
| 3630 | a = (u_int32_t *)addr; |
| 3631 | m = (u_int32_t *)mask; |
| 3632 | b1 = gen_mcmp(OR_NET, offset + 12, BPF_W, ntohl(a[3]), ntohl(m[3])); |
| 3633 | b0 = gen_mcmp(OR_NET, offset + 8, BPF_W, ntohl(a[2]), ntohl(m[2])); |
| 3634 | gen_and(b0, b1); |
| 3635 | b0 = gen_mcmp(OR_NET, offset + 4, BPF_W, ntohl(a[1]), ntohl(m[1])); |
| 3636 | gen_and(b0, b1); |
| 3637 | b0 = gen_mcmp(OR_NET, offset + 0, BPF_W, ntohl(a[0]), ntohl(m[0])); |
| 3638 | gen_and(b0, b1); |
| 3639 | b0 = gen_linktype(proto); |
| 3640 | gen_and(b0, b1); |
| 3641 | return b1; |
| 3642 | } |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3643 | #endif |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3644 | |
| 3645 | static struct block * |
| 3646 | gen_ehostop(eaddr, dir) |
| 3647 | register const u_char *eaddr; |
| 3648 | register int dir; |
| 3649 | { |
| 3650 | register struct block *b0, *b1; |
| 3651 | |
| 3652 | switch (dir) { |
| 3653 | case Q_SRC: |
| 3654 | return gen_bcmp(OR_LINK, off_mac + 6, 6, eaddr); |
| 3655 | |
| 3656 | case Q_DST: |
| 3657 | return gen_bcmp(OR_LINK, off_mac + 0, 6, eaddr); |
| 3658 | |
| 3659 | case Q_AND: |
| 3660 | b0 = gen_ehostop(eaddr, Q_SRC); |
| 3661 | b1 = gen_ehostop(eaddr, Q_DST); |
| 3662 | gen_and(b0, b1); |
| 3663 | return b1; |
| 3664 | |
| 3665 | case Q_DEFAULT: |
| 3666 | case Q_OR: |
| 3667 | b0 = gen_ehostop(eaddr, Q_SRC); |
| 3668 | b1 = gen_ehostop(eaddr, Q_DST); |
| 3669 | gen_or(b0, b1); |
| 3670 | return b1; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3671 | |
| 3672 | case Q_ADDR1: |
| 3673 | bpf_error("'addr1' is only supported on 802.11 with 802.11 headers"); |
| 3674 | break; |
| 3675 | |
| 3676 | case Q_ADDR2: |
| 3677 | bpf_error("'addr2' is only supported on 802.11 with 802.11 headers"); |
| 3678 | break; |
| 3679 | |
| 3680 | case Q_ADDR3: |
| 3681 | bpf_error("'addr3' is only supported on 802.11 with 802.11 headers"); |
| 3682 | break; |
| 3683 | |
| 3684 | case Q_ADDR4: |
| 3685 | bpf_error("'addr4' is only supported on 802.11 with 802.11 headers"); |
| 3686 | break; |
| 3687 | |
| 3688 | case Q_RA: |
| 3689 | bpf_error("'ra' is only supported on 802.11 with 802.11 headers"); |
| 3690 | break; |
| 3691 | |
| 3692 | case Q_TA: |
| 3693 | bpf_error("'ta' is only supported on 802.11 with 802.11 headers"); |
| 3694 | break; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3695 | } |
| 3696 | abort(); |
| 3697 | /* NOTREACHED */ |
| 3698 | } |
| 3699 | |
| 3700 | /* |
| 3701 | * Like gen_ehostop, but for DLT_FDDI |
| 3702 | */ |
| 3703 | static struct block * |
| 3704 | gen_fhostop(eaddr, dir) |
| 3705 | register const u_char *eaddr; |
| 3706 | register int dir; |
| 3707 | { |
| 3708 | struct block *b0, *b1; |
| 3709 | |
| 3710 | switch (dir) { |
| 3711 | case Q_SRC: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3712 | return gen_bcmp(OR_LINK, 6 + 1 + pcap_fddipad, 6, eaddr); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3713 | |
| 3714 | case Q_DST: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3715 | return gen_bcmp(OR_LINK, 0 + 1 + pcap_fddipad, 6, eaddr); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3716 | |
| 3717 | case Q_AND: |
| 3718 | b0 = gen_fhostop(eaddr, Q_SRC); |
| 3719 | b1 = gen_fhostop(eaddr, Q_DST); |
| 3720 | gen_and(b0, b1); |
| 3721 | return b1; |
| 3722 | |
| 3723 | case Q_DEFAULT: |
| 3724 | case Q_OR: |
| 3725 | b0 = gen_fhostop(eaddr, Q_SRC); |
| 3726 | b1 = gen_fhostop(eaddr, Q_DST); |
| 3727 | gen_or(b0, b1); |
| 3728 | return b1; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3729 | |
| 3730 | case Q_ADDR1: |
| 3731 | bpf_error("'addr1' is only supported on 802.11"); |
| 3732 | break; |
| 3733 | |
| 3734 | case Q_ADDR2: |
| 3735 | bpf_error("'addr2' is only supported on 802.11"); |
| 3736 | break; |
| 3737 | |
| 3738 | case Q_ADDR3: |
| 3739 | bpf_error("'addr3' is only supported on 802.11"); |
| 3740 | break; |
| 3741 | |
| 3742 | case Q_ADDR4: |
| 3743 | bpf_error("'addr4' is only supported on 802.11"); |
| 3744 | break; |
| 3745 | |
| 3746 | case Q_RA: |
| 3747 | bpf_error("'ra' is only supported on 802.11"); |
| 3748 | break; |
| 3749 | |
| 3750 | case Q_TA: |
| 3751 | bpf_error("'ta' is only supported on 802.11"); |
| 3752 | break; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3753 | } |
| 3754 | abort(); |
| 3755 | /* NOTREACHED */ |
| 3756 | } |
| 3757 | |
| 3758 | /* |
| 3759 | * Like gen_ehostop, but for DLT_IEEE802 (Token Ring) |
| 3760 | */ |
| 3761 | static struct block * |
| 3762 | gen_thostop(eaddr, dir) |
| 3763 | register const u_char *eaddr; |
| 3764 | register int dir; |
| 3765 | { |
| 3766 | register struct block *b0, *b1; |
| 3767 | |
| 3768 | switch (dir) { |
| 3769 | case Q_SRC: |
| 3770 | return gen_bcmp(OR_LINK, 8, 6, eaddr); |
| 3771 | |
| 3772 | case Q_DST: |
| 3773 | return gen_bcmp(OR_LINK, 2, 6, eaddr); |
| 3774 | |
| 3775 | case Q_AND: |
| 3776 | b0 = gen_thostop(eaddr, Q_SRC); |
| 3777 | b1 = gen_thostop(eaddr, Q_DST); |
| 3778 | gen_and(b0, b1); |
| 3779 | return b1; |
| 3780 | |
| 3781 | case Q_DEFAULT: |
| 3782 | case Q_OR: |
| 3783 | b0 = gen_thostop(eaddr, Q_SRC); |
| 3784 | b1 = gen_thostop(eaddr, Q_DST); |
| 3785 | gen_or(b0, b1); |
| 3786 | return b1; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3787 | |
| 3788 | case Q_ADDR1: |
| 3789 | bpf_error("'addr1' is only supported on 802.11"); |
| 3790 | break; |
| 3791 | |
| 3792 | case Q_ADDR2: |
| 3793 | bpf_error("'addr2' is only supported on 802.11"); |
| 3794 | break; |
| 3795 | |
| 3796 | case Q_ADDR3: |
| 3797 | bpf_error("'addr3' is only supported on 802.11"); |
| 3798 | break; |
| 3799 | |
| 3800 | case Q_ADDR4: |
| 3801 | bpf_error("'addr4' is only supported on 802.11"); |
| 3802 | break; |
| 3803 | |
| 3804 | case Q_RA: |
| 3805 | bpf_error("'ra' is only supported on 802.11"); |
| 3806 | break; |
| 3807 | |
| 3808 | case Q_TA: |
| 3809 | bpf_error("'ta' is only supported on 802.11"); |
| 3810 | break; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3811 | } |
| 3812 | abort(); |
| 3813 | /* NOTREACHED */ |
| 3814 | } |
| 3815 | |
| 3816 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3817 | * Like gen_ehostop, but for DLT_IEEE802_11 (802.11 wireless LAN) and |
| 3818 | * various 802.11 + radio headers. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3819 | */ |
| 3820 | static struct block * |
| 3821 | gen_wlanhostop(eaddr, dir) |
| 3822 | register const u_char *eaddr; |
| 3823 | register int dir; |
| 3824 | { |
| 3825 | register struct block *b0, *b1, *b2; |
| 3826 | register struct slist *s; |
| 3827 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3828 | #ifdef ENABLE_WLAN_FILTERING_PATCH |
| 3829 | /* |
| 3830 | * TODO GV 20070613 |
| 3831 | * We need to disable the optimizer because the optimizer is buggy |
| 3832 | * and wipes out some LD instructions generated by the below |
| 3833 | * code to validate the Frame Control bits |
| 3834 | */ |
| 3835 | no_optimize = 1; |
| 3836 | #endif /* ENABLE_WLAN_FILTERING_PATCH */ |
| 3837 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3838 | switch (dir) { |
| 3839 | case Q_SRC: |
| 3840 | /* |
| 3841 | * Oh, yuk. |
| 3842 | * |
| 3843 | * For control frames, there is no SA. |
| 3844 | * |
| 3845 | * For management frames, SA is at an |
| 3846 | * offset of 10 from the beginning of |
| 3847 | * the packet. |
| 3848 | * |
| 3849 | * For data frames, SA is at an offset |
| 3850 | * of 10 from the beginning of the packet |
| 3851 | * if From DS is clear, at an offset of |
| 3852 | * 16 from the beginning of the packet |
| 3853 | * if From DS is set and To DS is clear, |
| 3854 | * and an offset of 24 from the beginning |
| 3855 | * of the packet if From DS is set and To DS |
| 3856 | * is set. |
| 3857 | */ |
| 3858 | |
| 3859 | /* |
| 3860 | * Generate the tests to be done for data frames |
| 3861 | * with From DS set. |
| 3862 | * |
| 3863 | * First, check for To DS set, i.e. check "link[1] & 0x01". |
| 3864 | */ |
| 3865 | s = gen_load_a(OR_LINK, 1, BPF_B); |
| 3866 | b1 = new_block(JMP(BPF_JSET)); |
| 3867 | b1->s.k = 0x01; /* To DS */ |
| 3868 | b1->stmts = s; |
| 3869 | |
| 3870 | /* |
| 3871 | * If To DS is set, the SA is at 24. |
| 3872 | */ |
| 3873 | b0 = gen_bcmp(OR_LINK, 24, 6, eaddr); |
| 3874 | gen_and(b1, b0); |
| 3875 | |
| 3876 | /* |
| 3877 | * Now, check for To DS not set, i.e. check |
| 3878 | * "!(link[1] & 0x01)". |
| 3879 | */ |
| 3880 | s = gen_load_a(OR_LINK, 1, BPF_B); |
| 3881 | b2 = new_block(JMP(BPF_JSET)); |
| 3882 | b2->s.k = 0x01; /* To DS */ |
| 3883 | b2->stmts = s; |
| 3884 | gen_not(b2); |
| 3885 | |
| 3886 | /* |
| 3887 | * If To DS is not set, the SA is at 16. |
| 3888 | */ |
| 3889 | b1 = gen_bcmp(OR_LINK, 16, 6, eaddr); |
| 3890 | gen_and(b2, b1); |
| 3891 | |
| 3892 | /* |
| 3893 | * Now OR together the last two checks. That gives |
| 3894 | * the complete set of checks for data frames with |
| 3895 | * From DS set. |
| 3896 | */ |
| 3897 | gen_or(b1, b0); |
| 3898 | |
| 3899 | /* |
| 3900 | * Now check for From DS being set, and AND that with |
| 3901 | * the ORed-together checks. |
| 3902 | */ |
| 3903 | s = gen_load_a(OR_LINK, 1, BPF_B); |
| 3904 | b1 = new_block(JMP(BPF_JSET)); |
| 3905 | b1->s.k = 0x02; /* From DS */ |
| 3906 | b1->stmts = s; |
| 3907 | gen_and(b1, b0); |
| 3908 | |
| 3909 | /* |
| 3910 | * Now check for data frames with From DS not set. |
| 3911 | */ |
| 3912 | s = gen_load_a(OR_LINK, 1, BPF_B); |
| 3913 | b2 = new_block(JMP(BPF_JSET)); |
| 3914 | b2->s.k = 0x02; /* From DS */ |
| 3915 | b2->stmts = s; |
| 3916 | gen_not(b2); |
| 3917 | |
| 3918 | /* |
| 3919 | * If From DS isn't set, the SA is at 10. |
| 3920 | */ |
| 3921 | b1 = gen_bcmp(OR_LINK, 10, 6, eaddr); |
| 3922 | gen_and(b2, b1); |
| 3923 | |
| 3924 | /* |
| 3925 | * Now OR together the checks for data frames with |
| 3926 | * From DS not set and for data frames with From DS |
| 3927 | * set; that gives the checks done for data frames. |
| 3928 | */ |
| 3929 | gen_or(b1, b0); |
| 3930 | |
| 3931 | /* |
| 3932 | * Now check for a data frame. |
| 3933 | * I.e, check "link[0] & 0x08". |
| 3934 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 3935 | s = gen_load_a(OR_LINK, 0, BPF_B); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3936 | b1 = new_block(JMP(BPF_JSET)); |
| 3937 | b1->s.k = 0x08; |
| 3938 | b1->stmts = s; |
| 3939 | |
| 3940 | /* |
| 3941 | * AND that with the checks done for data frames. |
| 3942 | */ |
| 3943 | gen_and(b1, b0); |
| 3944 | |
| 3945 | /* |
| 3946 | * If the high-order bit of the type value is 0, this |
| 3947 | * is a management frame. |
| 3948 | * I.e, check "!(link[0] & 0x08)". |
| 3949 | */ |
| 3950 | s = gen_load_a(OR_LINK, 0, BPF_B); |
| 3951 | b2 = new_block(JMP(BPF_JSET)); |
| 3952 | b2->s.k = 0x08; |
| 3953 | b2->stmts = s; |
| 3954 | gen_not(b2); |
| 3955 | |
| 3956 | /* |
| 3957 | * For management frames, the SA is at 10. |
| 3958 | */ |
| 3959 | b1 = gen_bcmp(OR_LINK, 10, 6, eaddr); |
| 3960 | gen_and(b2, b1); |
| 3961 | |
| 3962 | /* |
| 3963 | * OR that with the checks done for data frames. |
| 3964 | * That gives the checks done for management and |
| 3965 | * data frames. |
| 3966 | */ |
| 3967 | gen_or(b1, b0); |
| 3968 | |
| 3969 | /* |
| 3970 | * If the low-order bit of the type value is 1, |
| 3971 | * this is either a control frame or a frame |
| 3972 | * with a reserved type, and thus not a |
| 3973 | * frame with an SA. |
| 3974 | * |
| 3975 | * I.e., check "!(link[0] & 0x04)". |
| 3976 | */ |
| 3977 | s = gen_load_a(OR_LINK, 0, BPF_B); |
| 3978 | b1 = new_block(JMP(BPF_JSET)); |
| 3979 | b1->s.k = 0x04; |
| 3980 | b1->stmts = s; |
| 3981 | gen_not(b1); |
| 3982 | |
| 3983 | /* |
| 3984 | * AND that with the checks for data and management |
| 3985 | * frames. |
| 3986 | */ |
| 3987 | gen_and(b1, b0); |
| 3988 | return b0; |
| 3989 | |
| 3990 | case Q_DST: |
| 3991 | /* |
| 3992 | * Oh, yuk. |
| 3993 | * |
| 3994 | * For control frames, there is no DA. |
| 3995 | * |
| 3996 | * For management frames, DA is at an |
| 3997 | * offset of 4 from the beginning of |
| 3998 | * the packet. |
| 3999 | * |
| 4000 | * For data frames, DA is at an offset |
| 4001 | * of 4 from the beginning of the packet |
| 4002 | * if To DS is clear and at an offset of |
| 4003 | * 16 from the beginning of the packet |
| 4004 | * if To DS is set. |
| 4005 | */ |
| 4006 | |
| 4007 | /* |
| 4008 | * Generate the tests to be done for data frames. |
| 4009 | * |
| 4010 | * First, check for To DS set, i.e. "link[1] & 0x01". |
| 4011 | */ |
| 4012 | s = gen_load_a(OR_LINK, 1, BPF_B); |
| 4013 | b1 = new_block(JMP(BPF_JSET)); |
| 4014 | b1->s.k = 0x01; /* To DS */ |
| 4015 | b1->stmts = s; |
| 4016 | |
| 4017 | /* |
| 4018 | * If To DS is set, the DA is at 16. |
| 4019 | */ |
| 4020 | b0 = gen_bcmp(OR_LINK, 16, 6, eaddr); |
| 4021 | gen_and(b1, b0); |
| 4022 | |
| 4023 | /* |
| 4024 | * Now, check for To DS not set, i.e. check |
| 4025 | * "!(link[1] & 0x01)". |
| 4026 | */ |
| 4027 | s = gen_load_a(OR_LINK, 1, BPF_B); |
| 4028 | b2 = new_block(JMP(BPF_JSET)); |
| 4029 | b2->s.k = 0x01; /* To DS */ |
| 4030 | b2->stmts = s; |
| 4031 | gen_not(b2); |
| 4032 | |
| 4033 | /* |
| 4034 | * If To DS is not set, the DA is at 4. |
| 4035 | */ |
| 4036 | b1 = gen_bcmp(OR_LINK, 4, 6, eaddr); |
| 4037 | gen_and(b2, b1); |
| 4038 | |
| 4039 | /* |
| 4040 | * Now OR together the last two checks. That gives |
| 4041 | * the complete set of checks for data frames. |
| 4042 | */ |
| 4043 | gen_or(b1, b0); |
| 4044 | |
| 4045 | /* |
| 4046 | * Now check for a data frame. |
| 4047 | * I.e, check "link[0] & 0x08". |
| 4048 | */ |
| 4049 | s = gen_load_a(OR_LINK, 0, BPF_B); |
| 4050 | b1 = new_block(JMP(BPF_JSET)); |
| 4051 | b1->s.k = 0x08; |
| 4052 | b1->stmts = s; |
| 4053 | |
| 4054 | /* |
| 4055 | * AND that with the checks done for data frames. |
| 4056 | */ |
| 4057 | gen_and(b1, b0); |
| 4058 | |
| 4059 | /* |
| 4060 | * If the high-order bit of the type value is 0, this |
| 4061 | * is a management frame. |
| 4062 | * I.e, check "!(link[0] & 0x08)". |
| 4063 | */ |
| 4064 | s = gen_load_a(OR_LINK, 0, BPF_B); |
| 4065 | b2 = new_block(JMP(BPF_JSET)); |
| 4066 | b2->s.k = 0x08; |
| 4067 | b2->stmts = s; |
| 4068 | gen_not(b2); |
| 4069 | |
| 4070 | /* |
| 4071 | * For management frames, the DA is at 4. |
| 4072 | */ |
| 4073 | b1 = gen_bcmp(OR_LINK, 4, 6, eaddr); |
| 4074 | gen_and(b2, b1); |
| 4075 | |
| 4076 | /* |
| 4077 | * OR that with the checks done for data frames. |
| 4078 | * That gives the checks done for management and |
| 4079 | * data frames. |
| 4080 | */ |
| 4081 | gen_or(b1, b0); |
| 4082 | |
| 4083 | /* |
| 4084 | * If the low-order bit of the type value is 1, |
| 4085 | * this is either a control frame or a frame |
| 4086 | * with a reserved type, and thus not a |
| 4087 | * frame with an SA. |
| 4088 | * |
| 4089 | * I.e., check "!(link[0] & 0x04)". |
| 4090 | */ |
| 4091 | s = gen_load_a(OR_LINK, 0, BPF_B); |
| 4092 | b1 = new_block(JMP(BPF_JSET)); |
| 4093 | b1->s.k = 0x04; |
| 4094 | b1->stmts = s; |
| 4095 | gen_not(b1); |
| 4096 | |
| 4097 | /* |
| 4098 | * AND that with the checks for data and management |
| 4099 | * frames. |
| 4100 | */ |
| 4101 | gen_and(b1, b0); |
| 4102 | return b0; |
| 4103 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 4104 | case Q_RA: |
| 4105 | /* |
| 4106 | * Not present in management frames; addr1 in other |
| 4107 | * frames. |
| 4108 | */ |
| 4109 | |
| 4110 | /* |
| 4111 | * If the high-order bit of the type value is 0, this |
| 4112 | * is a management frame. |
| 4113 | * I.e, check "(link[0] & 0x08)". |
| 4114 | */ |
| 4115 | s = gen_load_a(OR_LINK, 0, BPF_B); |
| 4116 | b1 = new_block(JMP(BPF_JSET)); |
| 4117 | b1->s.k = 0x08; |
| 4118 | b1->stmts = s; |
| 4119 | |
| 4120 | /* |
| 4121 | * Check addr1. |
| 4122 | */ |
| 4123 | b0 = gen_bcmp(OR_LINK, 4, 6, eaddr); |
| 4124 | |
| 4125 | /* |
| 4126 | * AND that with the check of addr1. |
| 4127 | */ |
| 4128 | gen_and(b1, b0); |
| 4129 | return (b0); |
| 4130 | |
| 4131 | case Q_TA: |
| 4132 | /* |
| 4133 | * Not present in management frames; addr2, if present, |
| 4134 | * in other frames. |
| 4135 | */ |
| 4136 | |
| 4137 | /* |
| 4138 | * Not present in CTS or ACK control frames. |
| 4139 | */ |
| 4140 | b0 = gen_mcmp(OR_LINK, 0, BPF_B, IEEE80211_FC0_TYPE_CTL, |
| 4141 | IEEE80211_FC0_TYPE_MASK); |
| 4142 | gen_not(b0); |
| 4143 | b1 = gen_mcmp(OR_LINK, 0, BPF_B, IEEE80211_FC0_SUBTYPE_CTS, |
| 4144 | IEEE80211_FC0_SUBTYPE_MASK); |
| 4145 | gen_not(b1); |
| 4146 | b2 = gen_mcmp(OR_LINK, 0, BPF_B, IEEE80211_FC0_SUBTYPE_ACK, |
| 4147 | IEEE80211_FC0_SUBTYPE_MASK); |
| 4148 | gen_not(b2); |
| 4149 | gen_and(b1, b2); |
| 4150 | gen_or(b0, b2); |
| 4151 | |
| 4152 | /* |
| 4153 | * If the high-order bit of the type value is 0, this |
| 4154 | * is a management frame. |
| 4155 | * I.e, check "(link[0] & 0x08)". |
| 4156 | */ |
| 4157 | s = gen_load_a(OR_LINK, 0, BPF_B); |
| 4158 | b1 = new_block(JMP(BPF_JSET)); |
| 4159 | b1->s.k = 0x08; |
| 4160 | b1->stmts = s; |
| 4161 | |
| 4162 | /* |
| 4163 | * AND that with the check for frames other than |
| 4164 | * CTS and ACK frames. |
| 4165 | */ |
| 4166 | gen_and(b1, b2); |
| 4167 | |
| 4168 | /* |
| 4169 | * Check addr2. |
| 4170 | */ |
| 4171 | b1 = gen_bcmp(OR_LINK, 10, 6, eaddr); |
| 4172 | gen_and(b2, b1); |
| 4173 | return b1; |
| 4174 | |
| 4175 | /* |
| 4176 | * XXX - add BSSID keyword? |
| 4177 | */ |
| 4178 | case Q_ADDR1: |
| 4179 | return (gen_bcmp(OR_LINK, 4, 6, eaddr)); |
| 4180 | |
| 4181 | case Q_ADDR2: |
| 4182 | /* |
| 4183 | * Not present in CTS or ACK control frames. |
| 4184 | */ |
| 4185 | b0 = gen_mcmp(OR_LINK, 0, BPF_B, IEEE80211_FC0_TYPE_CTL, |
| 4186 | IEEE80211_FC0_TYPE_MASK); |
| 4187 | gen_not(b0); |
| 4188 | b1 = gen_mcmp(OR_LINK, 0, BPF_B, IEEE80211_FC0_SUBTYPE_CTS, |
| 4189 | IEEE80211_FC0_SUBTYPE_MASK); |
| 4190 | gen_not(b1); |
| 4191 | b2 = gen_mcmp(OR_LINK, 0, BPF_B, IEEE80211_FC0_SUBTYPE_ACK, |
| 4192 | IEEE80211_FC0_SUBTYPE_MASK); |
| 4193 | gen_not(b2); |
| 4194 | gen_and(b1, b2); |
| 4195 | gen_or(b0, b2); |
| 4196 | b1 = gen_bcmp(OR_LINK, 10, 6, eaddr); |
| 4197 | gen_and(b2, b1); |
| 4198 | return b1; |
| 4199 | |
| 4200 | case Q_ADDR3: |
| 4201 | /* |
| 4202 | * Not present in control frames. |
| 4203 | */ |
| 4204 | b0 = gen_mcmp(OR_LINK, 0, BPF_B, IEEE80211_FC0_TYPE_CTL, |
| 4205 | IEEE80211_FC0_TYPE_MASK); |
| 4206 | gen_not(b0); |
| 4207 | b1 = gen_bcmp(OR_LINK, 16, 6, eaddr); |
| 4208 | gen_and(b0, b1); |
| 4209 | return b1; |
| 4210 | |
| 4211 | case Q_ADDR4: |
| 4212 | /* |
| 4213 | * Present only if the direction mask has both "From DS" |
| 4214 | * and "To DS" set. Neither control frames nor management |
| 4215 | * frames should have both of those set, so we don't |
| 4216 | * check the frame type. |
| 4217 | */ |
| 4218 | b0 = gen_mcmp(OR_LINK, 1, BPF_B, |
| 4219 | IEEE80211_FC1_DIR_DSTODS, IEEE80211_FC1_DIR_MASK); |
| 4220 | b1 = gen_bcmp(OR_LINK, 24, 6, eaddr); |
| 4221 | gen_and(b0, b1); |
| 4222 | return b1; |
| 4223 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4224 | case Q_AND: |
| 4225 | b0 = gen_wlanhostop(eaddr, Q_SRC); |
| 4226 | b1 = gen_wlanhostop(eaddr, Q_DST); |
| 4227 | gen_and(b0, b1); |
| 4228 | return b1; |
| 4229 | |
| 4230 | case Q_DEFAULT: |
| 4231 | case Q_OR: |
| 4232 | b0 = gen_wlanhostop(eaddr, Q_SRC); |
| 4233 | b1 = gen_wlanhostop(eaddr, Q_DST); |
| 4234 | gen_or(b0, b1); |
| 4235 | return b1; |
| 4236 | } |
| 4237 | abort(); |
| 4238 | /* NOTREACHED */ |
| 4239 | } |
| 4240 | |
| 4241 | /* |
| 4242 | * Like gen_ehostop, but for RFC 2625 IP-over-Fibre-Channel. |
| 4243 | * (We assume that the addresses are IEEE 48-bit MAC addresses, |
| 4244 | * as the RFC states.) |
| 4245 | */ |
| 4246 | static struct block * |
| 4247 | gen_ipfchostop(eaddr, dir) |
| 4248 | register const u_char *eaddr; |
| 4249 | register int dir; |
| 4250 | { |
| 4251 | register struct block *b0, *b1; |
| 4252 | |
| 4253 | switch (dir) { |
| 4254 | case Q_SRC: |
| 4255 | return gen_bcmp(OR_LINK, 10, 6, eaddr); |
| 4256 | |
| 4257 | case Q_DST: |
| 4258 | return gen_bcmp(OR_LINK, 2, 6, eaddr); |
| 4259 | |
| 4260 | case Q_AND: |
| 4261 | b0 = gen_ipfchostop(eaddr, Q_SRC); |
| 4262 | b1 = gen_ipfchostop(eaddr, Q_DST); |
| 4263 | gen_and(b0, b1); |
| 4264 | return b1; |
| 4265 | |
| 4266 | case Q_DEFAULT: |
| 4267 | case Q_OR: |
| 4268 | b0 = gen_ipfchostop(eaddr, Q_SRC); |
| 4269 | b1 = gen_ipfchostop(eaddr, Q_DST); |
| 4270 | gen_or(b0, b1); |
| 4271 | return b1; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 4272 | |
| 4273 | case Q_ADDR1: |
| 4274 | bpf_error("'addr1' is only supported on 802.11"); |
| 4275 | break; |
| 4276 | |
| 4277 | case Q_ADDR2: |
| 4278 | bpf_error("'addr2' is only supported on 802.11"); |
| 4279 | break; |
| 4280 | |
| 4281 | case Q_ADDR3: |
| 4282 | bpf_error("'addr3' is only supported on 802.11"); |
| 4283 | break; |
| 4284 | |
| 4285 | case Q_ADDR4: |
| 4286 | bpf_error("'addr4' is only supported on 802.11"); |
| 4287 | break; |
| 4288 | |
| 4289 | case Q_RA: |
| 4290 | bpf_error("'ra' is only supported on 802.11"); |
| 4291 | break; |
| 4292 | |
| 4293 | case Q_TA: |
| 4294 | bpf_error("'ta' is only supported on 802.11"); |
| 4295 | break; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4296 | } |
| 4297 | abort(); |
| 4298 | /* NOTREACHED */ |
| 4299 | } |
| 4300 | |
| 4301 | /* |
| 4302 | * This is quite tricky because there may be pad bytes in front of the |
| 4303 | * DECNET header, and then there are two possible data packet formats that |
| 4304 | * carry both src and dst addresses, plus 5 packet types in a format that |
| 4305 | * carries only the src node, plus 2 types that use a different format and |
| 4306 | * also carry just the src node. |
| 4307 | * |
| 4308 | * Yuck. |
| 4309 | * |
| 4310 | * Instead of doing those all right, we just look for data packets with |
| 4311 | * 0 or 1 bytes of padding. If you want to look at other packets, that |
| 4312 | * will require a lot more hacking. |
| 4313 | * |
| 4314 | * To add support for filtering on DECNET "areas" (network numbers) |
| 4315 | * one would want to add a "mask" argument to this routine. That would |
| 4316 | * make the filter even more inefficient, although one could be clever |
| 4317 | * and not generate masking instructions if the mask is 0xFFFF. |
| 4318 | */ |
| 4319 | static struct block * |
| 4320 | gen_dnhostop(addr, dir) |
| 4321 | bpf_u_int32 addr; |
| 4322 | int dir; |
| 4323 | { |
| 4324 | struct block *b0, *b1, *b2, *tmp; |
| 4325 | u_int offset_lh; /* offset if long header is received */ |
| 4326 | u_int offset_sh; /* offset if short header is received */ |
| 4327 | |
| 4328 | switch (dir) { |
| 4329 | |
| 4330 | case Q_DST: |
| 4331 | offset_sh = 1; /* follows flags */ |
| 4332 | offset_lh = 7; /* flgs,darea,dsubarea,HIORD */ |
| 4333 | break; |
| 4334 | |
| 4335 | case Q_SRC: |
| 4336 | offset_sh = 3; /* follows flags, dstnode */ |
| 4337 | offset_lh = 15; /* flgs,darea,dsubarea,did,sarea,ssub,HIORD */ |
| 4338 | break; |
| 4339 | |
| 4340 | case Q_AND: |
| 4341 | /* Inefficient because we do our Calvinball dance twice */ |
| 4342 | b0 = gen_dnhostop(addr, Q_SRC); |
| 4343 | b1 = gen_dnhostop(addr, Q_DST); |
| 4344 | gen_and(b0, b1); |
| 4345 | return b1; |
| 4346 | |
| 4347 | case Q_OR: |
| 4348 | case Q_DEFAULT: |
| 4349 | /* Inefficient because we do our Calvinball dance twice */ |
| 4350 | b0 = gen_dnhostop(addr, Q_SRC); |
| 4351 | b1 = gen_dnhostop(addr, Q_DST); |
| 4352 | gen_or(b0, b1); |
| 4353 | return b1; |
| 4354 | |
| 4355 | case Q_ISO: |
| 4356 | bpf_error("ISO host filtering not implemented"); |
| 4357 | |
| 4358 | default: |
| 4359 | abort(); |
| 4360 | } |
| 4361 | b0 = gen_linktype(ETHERTYPE_DN); |
| 4362 | /* Check for pad = 1, long header case */ |
| 4363 | tmp = gen_mcmp(OR_NET, 2, BPF_H, |
| 4364 | (bpf_int32)ntohs(0x0681), (bpf_int32)ntohs(0x07FF)); |
| 4365 | b1 = gen_cmp(OR_NET, 2 + 1 + offset_lh, |
| 4366 | BPF_H, (bpf_int32)ntohs((u_short)addr)); |
| 4367 | gen_and(tmp, b1); |
| 4368 | /* Check for pad = 0, long header case */ |
| 4369 | tmp = gen_mcmp(OR_NET, 2, BPF_B, (bpf_int32)0x06, (bpf_int32)0x7); |
| 4370 | b2 = gen_cmp(OR_NET, 2 + offset_lh, BPF_H, (bpf_int32)ntohs((u_short)addr)); |
| 4371 | gen_and(tmp, b2); |
| 4372 | gen_or(b2, b1); |
| 4373 | /* Check for pad = 1, short header case */ |
| 4374 | tmp = gen_mcmp(OR_NET, 2, BPF_H, |
| 4375 | (bpf_int32)ntohs(0x0281), (bpf_int32)ntohs(0x07FF)); |
| 4376 | b2 = gen_cmp(OR_NET, 2 + 1 + offset_sh, BPF_H, (bpf_int32)ntohs((u_short)addr)); |
| 4377 | gen_and(tmp, b2); |
| 4378 | gen_or(b2, b1); |
| 4379 | /* Check for pad = 0, short header case */ |
| 4380 | tmp = gen_mcmp(OR_NET, 2, BPF_B, (bpf_int32)0x02, (bpf_int32)0x7); |
| 4381 | b2 = gen_cmp(OR_NET, 2 + offset_sh, BPF_H, (bpf_int32)ntohs((u_short)addr)); |
| 4382 | gen_and(tmp, b2); |
| 4383 | gen_or(b2, b1); |
| 4384 | |
| 4385 | /* Combine with test for linktype */ |
| 4386 | gen_and(b0, b1); |
| 4387 | return b1; |
| 4388 | } |
| 4389 | |
| 4390 | /* |
| 4391 | * Generate a check for IPv4 or IPv6 for MPLS-encapsulated packets; |
| 4392 | * test the bottom-of-stack bit, and then check the version number |
| 4393 | * field in the IP header. |
| 4394 | */ |
| 4395 | static struct block * |
| 4396 | gen_mpls_linktype(proto) |
| 4397 | int proto; |
| 4398 | { |
| 4399 | struct block *b0, *b1; |
| 4400 | |
| 4401 | switch (proto) { |
| 4402 | |
| 4403 | case Q_IP: |
| 4404 | /* match the bottom-of-stack bit */ |
| 4405 | b0 = gen_mcmp(OR_NET, -2, BPF_B, 0x01, 0x01); |
| 4406 | /* match the IPv4 version number */ |
| 4407 | b1 = gen_mcmp(OR_NET, 0, BPF_B, 0x40, 0xf0); |
| 4408 | gen_and(b0, b1); |
| 4409 | return b1; |
| 4410 | |
| 4411 | case Q_IPV6: |
| 4412 | /* match the bottom-of-stack bit */ |
| 4413 | b0 = gen_mcmp(OR_NET, -2, BPF_B, 0x01, 0x01); |
| 4414 | /* match the IPv4 version number */ |
| 4415 | b1 = gen_mcmp(OR_NET, 0, BPF_B, 0x60, 0xf0); |
| 4416 | gen_and(b0, b1); |
| 4417 | return b1; |
| 4418 | |
| 4419 | default: |
| 4420 | abort(); |
| 4421 | } |
| 4422 | } |
| 4423 | |
| 4424 | static struct block * |
| 4425 | gen_host(addr, mask, proto, dir, type) |
| 4426 | bpf_u_int32 addr; |
| 4427 | bpf_u_int32 mask; |
| 4428 | int proto; |
| 4429 | int dir; |
| 4430 | int type; |
| 4431 | { |
| 4432 | struct block *b0, *b1; |
| 4433 | const char *typestr; |
| 4434 | |
| 4435 | if (type == Q_NET) |
| 4436 | typestr = "net"; |
| 4437 | else |
| 4438 | typestr = "host"; |
| 4439 | |
| 4440 | switch (proto) { |
| 4441 | |
| 4442 | case Q_DEFAULT: |
| 4443 | b0 = gen_host(addr, mask, Q_IP, dir, type); |
| 4444 | /* |
| 4445 | * Only check for non-IPv4 addresses if we're not |
| 4446 | * checking MPLS-encapsulated packets. |
| 4447 | */ |
| 4448 | if (label_stack_depth == 0) { |
| 4449 | b1 = gen_host(addr, mask, Q_ARP, dir, type); |
| 4450 | gen_or(b0, b1); |
| 4451 | b0 = gen_host(addr, mask, Q_RARP, dir, type); |
| 4452 | gen_or(b1, b0); |
| 4453 | } |
| 4454 | return b0; |
| 4455 | |
| 4456 | case Q_IP: |
| 4457 | return gen_hostop(addr, mask, dir, ETHERTYPE_IP, 12, 16); |
| 4458 | |
| 4459 | case Q_RARP: |
| 4460 | return gen_hostop(addr, mask, dir, ETHERTYPE_REVARP, 14, 24); |
| 4461 | |
| 4462 | case Q_ARP: |
| 4463 | return gen_hostop(addr, mask, dir, ETHERTYPE_ARP, 14, 24); |
| 4464 | |
| 4465 | case Q_TCP: |
| 4466 | bpf_error("'tcp' modifier applied to %s", typestr); |
| 4467 | |
| 4468 | case Q_SCTP: |
| 4469 | bpf_error("'sctp' modifier applied to %s", typestr); |
| 4470 | |
| 4471 | case Q_UDP: |
| 4472 | bpf_error("'udp' modifier applied to %s", typestr); |
| 4473 | |
| 4474 | case Q_ICMP: |
| 4475 | bpf_error("'icmp' modifier applied to %s", typestr); |
| 4476 | |
| 4477 | case Q_IGMP: |
| 4478 | bpf_error("'igmp' modifier applied to %s", typestr); |
| 4479 | |
| 4480 | case Q_IGRP: |
| 4481 | bpf_error("'igrp' modifier applied to %s", typestr); |
| 4482 | |
| 4483 | case Q_PIM: |
| 4484 | bpf_error("'pim' modifier applied to %s", typestr); |
| 4485 | |
| 4486 | case Q_VRRP: |
| 4487 | bpf_error("'vrrp' modifier applied to %s", typestr); |
| 4488 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 4489 | case Q_CARP: |
| 4490 | bpf_error("'carp' modifier applied to %s", typestr); |
| 4491 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4492 | case Q_ATALK: |
| 4493 | bpf_error("ATALK host filtering not implemented"); |
| 4494 | |
| 4495 | case Q_AARP: |
| 4496 | bpf_error("AARP host filtering not implemented"); |
| 4497 | |
| 4498 | case Q_DECNET: |
| 4499 | return gen_dnhostop(addr, dir); |
| 4500 | |
| 4501 | case Q_SCA: |
| 4502 | bpf_error("SCA host filtering not implemented"); |
| 4503 | |
| 4504 | case Q_LAT: |
| 4505 | bpf_error("LAT host filtering not implemented"); |
| 4506 | |
| 4507 | case Q_MOPDL: |
| 4508 | bpf_error("MOPDL host filtering not implemented"); |
| 4509 | |
| 4510 | case Q_MOPRC: |
| 4511 | bpf_error("MOPRC host filtering not implemented"); |
| 4512 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4513 | case Q_IPV6: |
| 4514 | bpf_error("'ip6' modifier applied to ip host"); |
| 4515 | |
| 4516 | case Q_ICMPV6: |
| 4517 | bpf_error("'icmp6' modifier applied to %s", typestr); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4518 | |
| 4519 | case Q_AH: |
| 4520 | bpf_error("'ah' modifier applied to %s", typestr); |
| 4521 | |
| 4522 | case Q_ESP: |
| 4523 | bpf_error("'esp' modifier applied to %s", typestr); |
| 4524 | |
| 4525 | case Q_ISO: |
| 4526 | bpf_error("ISO host filtering not implemented"); |
| 4527 | |
| 4528 | case Q_ESIS: |
| 4529 | bpf_error("'esis' modifier applied to %s", typestr); |
| 4530 | |
| 4531 | case Q_ISIS: |
| 4532 | bpf_error("'isis' modifier applied to %s", typestr); |
| 4533 | |
| 4534 | case Q_CLNP: |
| 4535 | bpf_error("'clnp' modifier applied to %s", typestr); |
| 4536 | |
| 4537 | case Q_STP: |
| 4538 | bpf_error("'stp' modifier applied to %s", typestr); |
| 4539 | |
| 4540 | case Q_IPX: |
| 4541 | bpf_error("IPX host filtering not implemented"); |
| 4542 | |
| 4543 | case Q_NETBEUI: |
| 4544 | bpf_error("'netbeui' modifier applied to %s", typestr); |
| 4545 | |
| 4546 | case Q_RADIO: |
| 4547 | bpf_error("'radio' modifier applied to %s", typestr); |
| 4548 | |
| 4549 | default: |
| 4550 | abort(); |
| 4551 | } |
| 4552 | /* NOTREACHED */ |
| 4553 | } |
| 4554 | |
| 4555 | #ifdef INET6 |
| 4556 | static struct block * |
| 4557 | gen_host6(addr, mask, proto, dir, type) |
| 4558 | struct in6_addr *addr; |
| 4559 | struct in6_addr *mask; |
| 4560 | int proto; |
| 4561 | int dir; |
| 4562 | int type; |
| 4563 | { |
| 4564 | const char *typestr; |
| 4565 | |
| 4566 | if (type == Q_NET) |
| 4567 | typestr = "net"; |
| 4568 | else |
| 4569 | typestr = "host"; |
| 4570 | |
| 4571 | switch (proto) { |
| 4572 | |
| 4573 | case Q_DEFAULT: |
| 4574 | return gen_host6(addr, mask, Q_IPV6, dir, type); |
| 4575 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 4576 | case Q_LINK: |
| 4577 | bpf_error("link-layer modifier applied to ip6 %s", typestr); |
| 4578 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4579 | case Q_IP: |
| 4580 | bpf_error("'ip' modifier applied to ip6 %s", typestr); |
| 4581 | |
| 4582 | case Q_RARP: |
| 4583 | bpf_error("'rarp' modifier applied to ip6 %s", typestr); |
| 4584 | |
| 4585 | case Q_ARP: |
| 4586 | bpf_error("'arp' modifier applied to ip6 %s", typestr); |
| 4587 | |
| 4588 | case Q_SCTP: |
| 4589 | bpf_error("'sctp' modifier applied to %s", typestr); |
| 4590 | |
| 4591 | case Q_TCP: |
| 4592 | bpf_error("'tcp' modifier applied to %s", typestr); |
| 4593 | |
| 4594 | case Q_UDP: |
| 4595 | bpf_error("'udp' modifier applied to %s", typestr); |
| 4596 | |
| 4597 | case Q_ICMP: |
| 4598 | bpf_error("'icmp' modifier applied to %s", typestr); |
| 4599 | |
| 4600 | case Q_IGMP: |
| 4601 | bpf_error("'igmp' modifier applied to %s", typestr); |
| 4602 | |
| 4603 | case Q_IGRP: |
| 4604 | bpf_error("'igrp' modifier applied to %s", typestr); |
| 4605 | |
| 4606 | case Q_PIM: |
| 4607 | bpf_error("'pim' modifier applied to %s", typestr); |
| 4608 | |
| 4609 | case Q_VRRP: |
| 4610 | bpf_error("'vrrp' modifier applied to %s", typestr); |
| 4611 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 4612 | case Q_CARP: |
| 4613 | bpf_error("'carp' modifier applied to %s", typestr); |
| 4614 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4615 | case Q_ATALK: |
| 4616 | bpf_error("ATALK host filtering not implemented"); |
| 4617 | |
| 4618 | case Q_AARP: |
| 4619 | bpf_error("AARP host filtering not implemented"); |
| 4620 | |
| 4621 | case Q_DECNET: |
| 4622 | bpf_error("'decnet' modifier applied to ip6 %s", typestr); |
| 4623 | |
| 4624 | case Q_SCA: |
| 4625 | bpf_error("SCA host filtering not implemented"); |
| 4626 | |
| 4627 | case Q_LAT: |
| 4628 | bpf_error("LAT host filtering not implemented"); |
| 4629 | |
| 4630 | case Q_MOPDL: |
| 4631 | bpf_error("MOPDL host filtering not implemented"); |
| 4632 | |
| 4633 | case Q_MOPRC: |
| 4634 | bpf_error("MOPRC host filtering not implemented"); |
| 4635 | |
| 4636 | case Q_IPV6: |
| 4637 | return gen_hostop6(addr, mask, dir, ETHERTYPE_IPV6, 8, 24); |
| 4638 | |
| 4639 | case Q_ICMPV6: |
| 4640 | bpf_error("'icmp6' modifier applied to %s", typestr); |
| 4641 | |
| 4642 | case Q_AH: |
| 4643 | bpf_error("'ah' modifier applied to %s", typestr); |
| 4644 | |
| 4645 | case Q_ESP: |
| 4646 | bpf_error("'esp' modifier applied to %s", typestr); |
| 4647 | |
| 4648 | case Q_ISO: |
| 4649 | bpf_error("ISO host filtering not implemented"); |
| 4650 | |
| 4651 | case Q_ESIS: |
| 4652 | bpf_error("'esis' modifier applied to %s", typestr); |
| 4653 | |
| 4654 | case Q_ISIS: |
| 4655 | bpf_error("'isis' modifier applied to %s", typestr); |
| 4656 | |
| 4657 | case Q_CLNP: |
| 4658 | bpf_error("'clnp' modifier applied to %s", typestr); |
| 4659 | |
| 4660 | case Q_STP: |
| 4661 | bpf_error("'stp' modifier applied to %s", typestr); |
| 4662 | |
| 4663 | case Q_IPX: |
| 4664 | bpf_error("IPX host filtering not implemented"); |
| 4665 | |
| 4666 | case Q_NETBEUI: |
| 4667 | bpf_error("'netbeui' modifier applied to %s", typestr); |
| 4668 | |
| 4669 | case Q_RADIO: |
| 4670 | bpf_error("'radio' modifier applied to %s", typestr); |
| 4671 | |
| 4672 | default: |
| 4673 | abort(); |
| 4674 | } |
| 4675 | /* NOTREACHED */ |
| 4676 | } |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 4677 | #endif |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4678 | |
| 4679 | #ifndef INET6 |
| 4680 | static struct block * |
| 4681 | gen_gateway(eaddr, alist, proto, dir) |
| 4682 | const u_char *eaddr; |
| 4683 | bpf_u_int32 **alist; |
| 4684 | int proto; |
| 4685 | int dir; |
| 4686 | { |
| 4687 | struct block *b0, *b1, *tmp; |
| 4688 | |
| 4689 | if (dir != 0) |
| 4690 | bpf_error("direction applied to 'gateway'"); |
| 4691 | |
| 4692 | switch (proto) { |
| 4693 | case Q_DEFAULT: |
| 4694 | case Q_IP: |
| 4695 | case Q_ARP: |
| 4696 | case Q_RARP: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 4697 | switch (linktype) { |
| 4698 | case DLT_EN10MB: |
| 4699 | case DLT_NETANALYZER: |
| 4700 | case DLT_NETANALYZER_TRANSPARENT: |
| 4701 | b0 = gen_ehostop(eaddr, Q_OR); |
| 4702 | break; |
| 4703 | case DLT_FDDI: |
| 4704 | b0 = gen_fhostop(eaddr, Q_OR); |
| 4705 | break; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4706 | case DLT_IEEE802: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 4707 | b0 = gen_thostop(eaddr, Q_OR); |
| 4708 | break; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4709 | case DLT_IEEE802_11: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4710 | case DLT_PRISM_HEADER: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 4711 | case DLT_IEEE802_11_RADIO_AVS: |
| 4712 | case DLT_IEEE802_11_RADIO: |
| 4713 | case DLT_PPI: |
| 4714 | b0 = gen_wlanhostop(eaddr, Q_OR); |
| 4715 | break; |
| 4716 | case DLT_SUNATM: |
| 4717 | if (!is_lane) |
| 4718 | bpf_error( |
| 4719 | "'gateway' supported only on ethernet/FDDI/token ring/802.11/ATM LANE/Fibre Channel"); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4720 | /* |
| 4721 | * Check that the packet doesn't begin with an |
| 4722 | * LE Control marker. (We've already generated |
| 4723 | * a test for LANE.) |
| 4724 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 4725 | b1 = gen_cmp(OR_LINK, SUNATM_PKT_BEGIN_POS, |
| 4726 | BPF_H, 0xFF00); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4727 | gen_not(b1); |
| 4728 | |
| 4729 | /* |
| 4730 | * Now check the MAC address. |
| 4731 | */ |
| 4732 | b0 = gen_ehostop(eaddr, Q_OR); |
| 4733 | gen_and(b1, b0); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 4734 | break; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4735 | case DLT_IP_OVER_FC: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 4736 | b0 = gen_ipfchostop(eaddr, Q_OR); |
| 4737 | break; |
| 4738 | default: |
| 4739 | bpf_error( |
| 4740 | "'gateway' supported only on ethernet/FDDI/token ring/802.11/ATM LANE/Fibre Channel"); |
| 4741 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4742 | b1 = gen_host(**alist++, 0xffffffff, proto, Q_OR, Q_HOST); |
| 4743 | while (*alist) { |
| 4744 | tmp = gen_host(**alist++, 0xffffffff, proto, Q_OR, |
| 4745 | Q_HOST); |
| 4746 | gen_or(b1, tmp); |
| 4747 | b1 = tmp; |
| 4748 | } |
| 4749 | gen_not(b1); |
| 4750 | gen_and(b0, b1); |
| 4751 | return b1; |
| 4752 | } |
| 4753 | bpf_error("illegal modifier of 'gateway'"); |
| 4754 | /* NOTREACHED */ |
| 4755 | } |
| 4756 | #endif |
| 4757 | |
| 4758 | struct block * |
| 4759 | gen_proto_abbrev(proto) |
| 4760 | int proto; |
| 4761 | { |
| 4762 | struct block *b0; |
| 4763 | struct block *b1; |
| 4764 | |
| 4765 | switch (proto) { |
| 4766 | |
| 4767 | case Q_SCTP: |
| 4768 | b1 = gen_proto(IPPROTO_SCTP, Q_IP, Q_DEFAULT); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4769 | b0 = gen_proto(IPPROTO_SCTP, Q_IPV6, Q_DEFAULT); |
| 4770 | gen_or(b0, b1); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4771 | break; |
| 4772 | |
| 4773 | case Q_TCP: |
| 4774 | b1 = gen_proto(IPPROTO_TCP, Q_IP, Q_DEFAULT); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4775 | b0 = gen_proto(IPPROTO_TCP, Q_IPV6, Q_DEFAULT); |
| 4776 | gen_or(b0, b1); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4777 | break; |
| 4778 | |
| 4779 | case Q_UDP: |
| 4780 | b1 = gen_proto(IPPROTO_UDP, Q_IP, Q_DEFAULT); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4781 | b0 = gen_proto(IPPROTO_UDP, Q_IPV6, Q_DEFAULT); |
| 4782 | gen_or(b0, b1); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4783 | break; |
| 4784 | |
| 4785 | case Q_ICMP: |
| 4786 | b1 = gen_proto(IPPROTO_ICMP, Q_IP, Q_DEFAULT); |
| 4787 | break; |
| 4788 | |
| 4789 | #ifndef IPPROTO_IGMP |
| 4790 | #define IPPROTO_IGMP 2 |
| 4791 | #endif |
| 4792 | |
| 4793 | case Q_IGMP: |
| 4794 | b1 = gen_proto(IPPROTO_IGMP, Q_IP, Q_DEFAULT); |
| 4795 | break; |
| 4796 | |
| 4797 | #ifndef IPPROTO_IGRP |
| 4798 | #define IPPROTO_IGRP 9 |
| 4799 | #endif |
| 4800 | case Q_IGRP: |
| 4801 | b1 = gen_proto(IPPROTO_IGRP, Q_IP, Q_DEFAULT); |
| 4802 | break; |
| 4803 | |
| 4804 | #ifndef IPPROTO_PIM |
| 4805 | #define IPPROTO_PIM 103 |
| 4806 | #endif |
| 4807 | |
| 4808 | case Q_PIM: |
| 4809 | b1 = gen_proto(IPPROTO_PIM, Q_IP, Q_DEFAULT); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4810 | b0 = gen_proto(IPPROTO_PIM, Q_IPV6, Q_DEFAULT); |
| 4811 | gen_or(b0, b1); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4812 | break; |
| 4813 | |
| 4814 | #ifndef IPPROTO_VRRP |
| 4815 | #define IPPROTO_VRRP 112 |
| 4816 | #endif |
| 4817 | |
| 4818 | case Q_VRRP: |
| 4819 | b1 = gen_proto(IPPROTO_VRRP, Q_IP, Q_DEFAULT); |
| 4820 | break; |
| 4821 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 4822 | #ifndef IPPROTO_CARP |
| 4823 | #define IPPROTO_CARP 112 |
| 4824 | #endif |
| 4825 | |
| 4826 | case Q_CARP: |
| 4827 | b1 = gen_proto(IPPROTO_CARP, Q_IP, Q_DEFAULT); |
| 4828 | break; |
| 4829 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4830 | case Q_IP: |
| 4831 | b1 = gen_linktype(ETHERTYPE_IP); |
| 4832 | break; |
| 4833 | |
| 4834 | case Q_ARP: |
| 4835 | b1 = gen_linktype(ETHERTYPE_ARP); |
| 4836 | break; |
| 4837 | |
| 4838 | case Q_RARP: |
| 4839 | b1 = gen_linktype(ETHERTYPE_REVARP); |
| 4840 | break; |
| 4841 | |
| 4842 | case Q_LINK: |
| 4843 | bpf_error("link layer applied in wrong context"); |
| 4844 | |
| 4845 | case Q_ATALK: |
| 4846 | b1 = gen_linktype(ETHERTYPE_ATALK); |
| 4847 | break; |
| 4848 | |
| 4849 | case Q_AARP: |
| 4850 | b1 = gen_linktype(ETHERTYPE_AARP); |
| 4851 | break; |
| 4852 | |
| 4853 | case Q_DECNET: |
| 4854 | b1 = gen_linktype(ETHERTYPE_DN); |
| 4855 | break; |
| 4856 | |
| 4857 | case Q_SCA: |
| 4858 | b1 = gen_linktype(ETHERTYPE_SCA); |
| 4859 | break; |
| 4860 | |
| 4861 | case Q_LAT: |
| 4862 | b1 = gen_linktype(ETHERTYPE_LAT); |
| 4863 | break; |
| 4864 | |
| 4865 | case Q_MOPDL: |
| 4866 | b1 = gen_linktype(ETHERTYPE_MOPDL); |
| 4867 | break; |
| 4868 | |
| 4869 | case Q_MOPRC: |
| 4870 | b1 = gen_linktype(ETHERTYPE_MOPRC); |
| 4871 | break; |
| 4872 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4873 | case Q_IPV6: |
| 4874 | b1 = gen_linktype(ETHERTYPE_IPV6); |
| 4875 | break; |
| 4876 | |
| 4877 | #ifndef IPPROTO_ICMPV6 |
| 4878 | #define IPPROTO_ICMPV6 58 |
| 4879 | #endif |
| 4880 | case Q_ICMPV6: |
| 4881 | b1 = gen_proto(IPPROTO_ICMPV6, Q_IPV6, Q_DEFAULT); |
| 4882 | break; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4883 | |
| 4884 | #ifndef IPPROTO_AH |
| 4885 | #define IPPROTO_AH 51 |
| 4886 | #endif |
| 4887 | case Q_AH: |
| 4888 | b1 = gen_proto(IPPROTO_AH, Q_IP, Q_DEFAULT); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4889 | b0 = gen_proto(IPPROTO_AH, Q_IPV6, Q_DEFAULT); |
| 4890 | gen_or(b0, b1); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4891 | break; |
| 4892 | |
| 4893 | #ifndef IPPROTO_ESP |
| 4894 | #define IPPROTO_ESP 50 |
| 4895 | #endif |
| 4896 | case Q_ESP: |
| 4897 | b1 = gen_proto(IPPROTO_ESP, Q_IP, Q_DEFAULT); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4898 | b0 = gen_proto(IPPROTO_ESP, Q_IPV6, Q_DEFAULT); |
| 4899 | gen_or(b0, b1); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 4900 | break; |
| 4901 | |
| 4902 | case Q_ISO: |
| 4903 | b1 = gen_linktype(LLCSAP_ISONS); |
| 4904 | break; |
| 4905 | |
| 4906 | case Q_ESIS: |
| 4907 | b1 = gen_proto(ISO9542_ESIS, Q_ISO, Q_DEFAULT); |
| 4908 | break; |
| 4909 | |
| 4910 | case Q_ISIS: |
| 4911 | b1 = gen_proto(ISO10589_ISIS, Q_ISO, Q_DEFAULT); |
| 4912 | break; |
| 4913 | |
| 4914 | case Q_ISIS_L1: /* all IS-IS Level1 PDU-Types */ |
| 4915 | b0 = gen_proto(ISIS_L1_LAN_IIH, Q_ISIS, Q_DEFAULT); |
| 4916 | b1 = gen_proto(ISIS_PTP_IIH, Q_ISIS, Q_DEFAULT); /* FIXME extract the circuit-type bits */ |
| 4917 | gen_or(b0, b1); |
| 4918 | b0 = gen_proto(ISIS_L1_LSP, Q_ISIS, Q_DEFAULT); |
| 4919 | gen_or(b0, b1); |
| 4920 | b0 = gen_proto(ISIS_L1_CSNP, Q_ISIS, Q_DEFAULT); |
| 4921 | gen_or(b0, b1); |
| 4922 | b0 = gen_proto(ISIS_L1_PSNP, Q_ISIS, Q_DEFAULT); |
| 4923 | gen_or(b0, b1); |
| 4924 | break; |
| 4925 | |
| 4926 | case Q_ISIS_L2: /* all IS-IS Level2 PDU-Types */ |
| 4927 | b0 = gen_proto(ISIS_L2_LAN_IIH, Q_ISIS, Q_DEFAULT); |
| 4928 | b1 = gen_proto(ISIS_PTP_IIH, Q_ISIS, Q_DEFAULT); /* FIXME extract the circuit-type bits */ |
| 4929 | gen_or(b0, b1); |
| 4930 | b0 = gen_proto(ISIS_L2_LSP, Q_ISIS, Q_DEFAULT); |
| 4931 | gen_or(b0, b1); |
| 4932 | b0 = gen_proto(ISIS_L2_CSNP, Q_ISIS, Q_DEFAULT); |
| 4933 | gen_or(b0, b1); |
| 4934 | b0 = gen_proto(ISIS_L2_PSNP, Q_ISIS, Q_DEFAULT); |
| 4935 | gen_or(b0, b1); |
| 4936 | break; |
| 4937 | |
| 4938 | case Q_ISIS_IIH: /* all IS-IS Hello PDU-Types */ |
| 4939 | b0 = gen_proto(ISIS_L1_LAN_IIH, Q_ISIS, Q_DEFAULT); |
| 4940 | b1 = gen_proto(ISIS_L2_LAN_IIH, Q_ISIS, Q_DEFAULT); |
| 4941 | gen_or(b0, b1); |
| 4942 | b0 = gen_proto(ISIS_PTP_IIH, Q_ISIS, Q_DEFAULT); |
| 4943 | gen_or(b0, b1); |
| 4944 | break; |
| 4945 | |
| 4946 | case Q_ISIS_LSP: |
| 4947 | b0 = gen_proto(ISIS_L1_LSP, Q_ISIS, Q_DEFAULT); |
| 4948 | b1 = gen_proto(ISIS_L2_LSP, Q_ISIS, Q_DEFAULT); |
| 4949 | gen_or(b0, b1); |
| 4950 | break; |
| 4951 | |
| 4952 | case Q_ISIS_SNP: |
| 4953 | b0 = gen_proto(ISIS_L1_CSNP, Q_ISIS, Q_DEFAULT); |
| 4954 | b1 = gen_proto(ISIS_L2_CSNP, Q_ISIS, Q_DEFAULT); |
| 4955 | gen_or(b0, b1); |
| 4956 | b0 = gen_proto(ISIS_L1_PSNP, Q_ISIS, Q_DEFAULT); |
| 4957 | gen_or(b0, b1); |
| 4958 | b0 = gen_proto(ISIS_L2_PSNP, Q_ISIS, Q_DEFAULT); |
| 4959 | gen_or(b0, b1); |
| 4960 | break; |
| 4961 | |
| 4962 | case Q_ISIS_CSNP: |
| 4963 | b0 = gen_proto(ISIS_L1_CSNP, Q_ISIS, Q_DEFAULT); |
| 4964 | b1 = gen_proto(ISIS_L2_CSNP, Q_ISIS, Q_DEFAULT); |
| 4965 | gen_or(b0, b1); |
| 4966 | break; |
| 4967 | |
| 4968 | case Q_ISIS_PSNP: |
| 4969 | b0 = gen_proto(ISIS_L1_PSNP, Q_ISIS, Q_DEFAULT); |
| 4970 | b1 = gen_proto(ISIS_L2_PSNP, Q_ISIS, Q_DEFAULT); |
| 4971 | gen_or(b0, b1); |
| 4972 | break; |
| 4973 | |
| 4974 | case Q_CLNP: |
| 4975 | b1 = gen_proto(ISO8473_CLNP, Q_ISO, Q_DEFAULT); |
| 4976 | break; |
| 4977 | |
| 4978 | case Q_STP: |
| 4979 | b1 = gen_linktype(LLCSAP_8021D); |
| 4980 | break; |
| 4981 | |
| 4982 | case Q_IPX: |
| 4983 | b1 = gen_linktype(LLCSAP_IPX); |
| 4984 | break; |
| 4985 | |
| 4986 | case Q_NETBEUI: |
| 4987 | b1 = gen_linktype(LLCSAP_NETBEUI); |
| 4988 | break; |
| 4989 | |
| 4990 | case Q_RADIO: |
| 4991 | bpf_error("'radio' is not a valid protocol type"); |
| 4992 | |
| 4993 | default: |
| 4994 | abort(); |
| 4995 | } |
| 4996 | return b1; |
| 4997 | } |
| 4998 | |
| 4999 | static struct block * |
| 5000 | gen_ipfrag() |
| 5001 | { |
| 5002 | struct slist *s; |
| 5003 | struct block *b; |
| 5004 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5005 | /* not IPv4 frag other than the first frag */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5006 | s = gen_load_a(OR_NET, 6, BPF_H); |
| 5007 | b = new_block(JMP(BPF_JSET)); |
| 5008 | b->s.k = 0x1fff; |
| 5009 | b->stmts = s; |
| 5010 | gen_not(b); |
| 5011 | |
| 5012 | return b; |
| 5013 | } |
| 5014 | |
| 5015 | /* |
| 5016 | * Generate a comparison to a port value in the transport-layer header |
| 5017 | * at the specified offset from the beginning of that header. |
| 5018 | * |
| 5019 | * XXX - this handles a variable-length prefix preceding the link-layer |
| 5020 | * header, such as the radiotap or AVS radio prefix, but doesn't handle |
| 5021 | * variable-length link-layer headers (such as Token Ring or 802.11 |
| 5022 | * headers). |
| 5023 | */ |
| 5024 | static struct block * |
| 5025 | gen_portatom(off, v) |
| 5026 | int off; |
| 5027 | bpf_int32 v; |
| 5028 | { |
| 5029 | return gen_cmp(OR_TRAN_IPV4, off, BPF_H, v); |
| 5030 | } |
| 5031 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5032 | static struct block * |
| 5033 | gen_portatom6(off, v) |
| 5034 | int off; |
| 5035 | bpf_int32 v; |
| 5036 | { |
| 5037 | return gen_cmp(OR_TRAN_IPV6, off, BPF_H, v); |
| 5038 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5039 | |
| 5040 | struct block * |
| 5041 | gen_portop(port, proto, dir) |
| 5042 | int port, proto, dir; |
| 5043 | { |
| 5044 | struct block *b0, *b1, *tmp; |
| 5045 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5046 | /* ip proto 'proto' and not a fragment other than the first fragment */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5047 | tmp = gen_cmp(OR_NET, 9, BPF_B, (bpf_int32)proto); |
| 5048 | b0 = gen_ipfrag(); |
| 5049 | gen_and(tmp, b0); |
| 5050 | |
| 5051 | switch (dir) { |
| 5052 | case Q_SRC: |
| 5053 | b1 = gen_portatom(0, (bpf_int32)port); |
| 5054 | break; |
| 5055 | |
| 5056 | case Q_DST: |
| 5057 | b1 = gen_portatom(2, (bpf_int32)port); |
| 5058 | break; |
| 5059 | |
| 5060 | case Q_OR: |
| 5061 | case Q_DEFAULT: |
| 5062 | tmp = gen_portatom(0, (bpf_int32)port); |
| 5063 | b1 = gen_portatom(2, (bpf_int32)port); |
| 5064 | gen_or(tmp, b1); |
| 5065 | break; |
| 5066 | |
| 5067 | case Q_AND: |
| 5068 | tmp = gen_portatom(0, (bpf_int32)port); |
| 5069 | b1 = gen_portatom(2, (bpf_int32)port); |
| 5070 | gen_and(tmp, b1); |
| 5071 | break; |
| 5072 | |
| 5073 | default: |
| 5074 | abort(); |
| 5075 | } |
| 5076 | gen_and(b0, b1); |
| 5077 | |
| 5078 | return b1; |
| 5079 | } |
| 5080 | |
| 5081 | static struct block * |
| 5082 | gen_port(port, ip_proto, dir) |
| 5083 | int port; |
| 5084 | int ip_proto; |
| 5085 | int dir; |
| 5086 | { |
| 5087 | struct block *b0, *b1, *tmp; |
| 5088 | |
| 5089 | /* |
| 5090 | * ether proto ip |
| 5091 | * |
| 5092 | * For FDDI, RFC 1188 says that SNAP encapsulation is used, |
| 5093 | * not LLC encapsulation with LLCSAP_IP. |
| 5094 | * |
| 5095 | * For IEEE 802 networks - which includes 802.5 token ring |
| 5096 | * (which is what DLT_IEEE802 means) and 802.11 - RFC 1042 |
| 5097 | * says that SNAP encapsulation is used, not LLC encapsulation |
| 5098 | * with LLCSAP_IP. |
| 5099 | * |
| 5100 | * For LLC-encapsulated ATM/"Classical IP", RFC 1483 and |
| 5101 | * RFC 2225 say that SNAP encapsulation is used, not LLC |
| 5102 | * encapsulation with LLCSAP_IP. |
| 5103 | * |
| 5104 | * So we always check for ETHERTYPE_IP. |
| 5105 | */ |
| 5106 | b0 = gen_linktype(ETHERTYPE_IP); |
| 5107 | |
| 5108 | switch (ip_proto) { |
| 5109 | case IPPROTO_UDP: |
| 5110 | case IPPROTO_TCP: |
| 5111 | case IPPROTO_SCTP: |
| 5112 | b1 = gen_portop(port, ip_proto, dir); |
| 5113 | break; |
| 5114 | |
| 5115 | case PROTO_UNDEF: |
| 5116 | tmp = gen_portop(port, IPPROTO_TCP, dir); |
| 5117 | b1 = gen_portop(port, IPPROTO_UDP, dir); |
| 5118 | gen_or(tmp, b1); |
| 5119 | tmp = gen_portop(port, IPPROTO_SCTP, dir); |
| 5120 | gen_or(tmp, b1); |
| 5121 | break; |
| 5122 | |
| 5123 | default: |
| 5124 | abort(); |
| 5125 | } |
| 5126 | gen_and(b0, b1); |
| 5127 | return b1; |
| 5128 | } |
| 5129 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5130 | struct block * |
| 5131 | gen_portop6(port, proto, dir) |
| 5132 | int port, proto, dir; |
| 5133 | { |
| 5134 | struct block *b0, *b1, *tmp; |
| 5135 | |
| 5136 | /* ip6 proto 'proto' */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5137 | /* XXX - catch the first fragment of a fragmented packet? */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5138 | b0 = gen_cmp(OR_NET, 6, BPF_B, (bpf_int32)proto); |
| 5139 | |
| 5140 | switch (dir) { |
| 5141 | case Q_SRC: |
| 5142 | b1 = gen_portatom6(0, (bpf_int32)port); |
| 5143 | break; |
| 5144 | |
| 5145 | case Q_DST: |
| 5146 | b1 = gen_portatom6(2, (bpf_int32)port); |
| 5147 | break; |
| 5148 | |
| 5149 | case Q_OR: |
| 5150 | case Q_DEFAULT: |
| 5151 | tmp = gen_portatom6(0, (bpf_int32)port); |
| 5152 | b1 = gen_portatom6(2, (bpf_int32)port); |
| 5153 | gen_or(tmp, b1); |
| 5154 | break; |
| 5155 | |
| 5156 | case Q_AND: |
| 5157 | tmp = gen_portatom6(0, (bpf_int32)port); |
| 5158 | b1 = gen_portatom6(2, (bpf_int32)port); |
| 5159 | gen_and(tmp, b1); |
| 5160 | break; |
| 5161 | |
| 5162 | default: |
| 5163 | abort(); |
| 5164 | } |
| 5165 | gen_and(b0, b1); |
| 5166 | |
| 5167 | return b1; |
| 5168 | } |
| 5169 | |
| 5170 | static struct block * |
| 5171 | gen_port6(port, ip_proto, dir) |
| 5172 | int port; |
| 5173 | int ip_proto; |
| 5174 | int dir; |
| 5175 | { |
| 5176 | struct block *b0, *b1, *tmp; |
| 5177 | |
| 5178 | /* link proto ip6 */ |
| 5179 | b0 = gen_linktype(ETHERTYPE_IPV6); |
| 5180 | |
| 5181 | switch (ip_proto) { |
| 5182 | case IPPROTO_UDP: |
| 5183 | case IPPROTO_TCP: |
| 5184 | case IPPROTO_SCTP: |
| 5185 | b1 = gen_portop6(port, ip_proto, dir); |
| 5186 | break; |
| 5187 | |
| 5188 | case PROTO_UNDEF: |
| 5189 | tmp = gen_portop6(port, IPPROTO_TCP, dir); |
| 5190 | b1 = gen_portop6(port, IPPROTO_UDP, dir); |
| 5191 | gen_or(tmp, b1); |
| 5192 | tmp = gen_portop6(port, IPPROTO_SCTP, dir); |
| 5193 | gen_or(tmp, b1); |
| 5194 | break; |
| 5195 | |
| 5196 | default: |
| 5197 | abort(); |
| 5198 | } |
| 5199 | gen_and(b0, b1); |
| 5200 | return b1; |
| 5201 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5202 | |
| 5203 | /* gen_portrange code */ |
| 5204 | static struct block * |
| 5205 | gen_portrangeatom(off, v1, v2) |
| 5206 | int off; |
| 5207 | bpf_int32 v1, v2; |
| 5208 | { |
| 5209 | struct block *b1, *b2; |
| 5210 | |
| 5211 | if (v1 > v2) { |
| 5212 | /* |
| 5213 | * Reverse the order of the ports, so v1 is the lower one. |
| 5214 | */ |
| 5215 | bpf_int32 vtemp; |
| 5216 | |
| 5217 | vtemp = v1; |
| 5218 | v1 = v2; |
| 5219 | v2 = vtemp; |
| 5220 | } |
| 5221 | |
| 5222 | b1 = gen_cmp_ge(OR_TRAN_IPV4, off, BPF_H, v1); |
| 5223 | b2 = gen_cmp_le(OR_TRAN_IPV4, off, BPF_H, v2); |
| 5224 | |
| 5225 | gen_and(b1, b2); |
| 5226 | |
| 5227 | return b2; |
| 5228 | } |
| 5229 | |
| 5230 | struct block * |
| 5231 | gen_portrangeop(port1, port2, proto, dir) |
| 5232 | int port1, port2; |
| 5233 | int proto; |
| 5234 | int dir; |
| 5235 | { |
| 5236 | struct block *b0, *b1, *tmp; |
| 5237 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5238 | /* ip proto 'proto' and not a fragment other than the first fragment */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5239 | tmp = gen_cmp(OR_NET, 9, BPF_B, (bpf_int32)proto); |
| 5240 | b0 = gen_ipfrag(); |
| 5241 | gen_and(tmp, b0); |
| 5242 | |
| 5243 | switch (dir) { |
| 5244 | case Q_SRC: |
| 5245 | b1 = gen_portrangeatom(0, (bpf_int32)port1, (bpf_int32)port2); |
| 5246 | break; |
| 5247 | |
| 5248 | case Q_DST: |
| 5249 | b1 = gen_portrangeatom(2, (bpf_int32)port1, (bpf_int32)port2); |
| 5250 | break; |
| 5251 | |
| 5252 | case Q_OR: |
| 5253 | case Q_DEFAULT: |
| 5254 | tmp = gen_portrangeatom(0, (bpf_int32)port1, (bpf_int32)port2); |
| 5255 | b1 = gen_portrangeatom(2, (bpf_int32)port1, (bpf_int32)port2); |
| 5256 | gen_or(tmp, b1); |
| 5257 | break; |
| 5258 | |
| 5259 | case Q_AND: |
| 5260 | tmp = gen_portrangeatom(0, (bpf_int32)port1, (bpf_int32)port2); |
| 5261 | b1 = gen_portrangeatom(2, (bpf_int32)port1, (bpf_int32)port2); |
| 5262 | gen_and(tmp, b1); |
| 5263 | break; |
| 5264 | |
| 5265 | default: |
| 5266 | abort(); |
| 5267 | } |
| 5268 | gen_and(b0, b1); |
| 5269 | |
| 5270 | return b1; |
| 5271 | } |
| 5272 | |
| 5273 | static struct block * |
| 5274 | gen_portrange(port1, port2, ip_proto, dir) |
| 5275 | int port1, port2; |
| 5276 | int ip_proto; |
| 5277 | int dir; |
| 5278 | { |
| 5279 | struct block *b0, *b1, *tmp; |
| 5280 | |
| 5281 | /* link proto ip */ |
| 5282 | b0 = gen_linktype(ETHERTYPE_IP); |
| 5283 | |
| 5284 | switch (ip_proto) { |
| 5285 | case IPPROTO_UDP: |
| 5286 | case IPPROTO_TCP: |
| 5287 | case IPPROTO_SCTP: |
| 5288 | b1 = gen_portrangeop(port1, port2, ip_proto, dir); |
| 5289 | break; |
| 5290 | |
| 5291 | case PROTO_UNDEF: |
| 5292 | tmp = gen_portrangeop(port1, port2, IPPROTO_TCP, dir); |
| 5293 | b1 = gen_portrangeop(port1, port2, IPPROTO_UDP, dir); |
| 5294 | gen_or(tmp, b1); |
| 5295 | tmp = gen_portrangeop(port1, port2, IPPROTO_SCTP, dir); |
| 5296 | gen_or(tmp, b1); |
| 5297 | break; |
| 5298 | |
| 5299 | default: |
| 5300 | abort(); |
| 5301 | } |
| 5302 | gen_and(b0, b1); |
| 5303 | return b1; |
| 5304 | } |
| 5305 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5306 | static struct block * |
| 5307 | gen_portrangeatom6(off, v1, v2) |
| 5308 | int off; |
| 5309 | bpf_int32 v1, v2; |
| 5310 | { |
| 5311 | struct block *b1, *b2; |
| 5312 | |
| 5313 | if (v1 > v2) { |
| 5314 | /* |
| 5315 | * Reverse the order of the ports, so v1 is the lower one. |
| 5316 | */ |
| 5317 | bpf_int32 vtemp; |
| 5318 | |
| 5319 | vtemp = v1; |
| 5320 | v1 = v2; |
| 5321 | v2 = vtemp; |
| 5322 | } |
| 5323 | |
| 5324 | b1 = gen_cmp_ge(OR_TRAN_IPV6, off, BPF_H, v1); |
| 5325 | b2 = gen_cmp_le(OR_TRAN_IPV6, off, BPF_H, v2); |
| 5326 | |
| 5327 | gen_and(b1, b2); |
| 5328 | |
| 5329 | return b2; |
| 5330 | } |
| 5331 | |
| 5332 | struct block * |
| 5333 | gen_portrangeop6(port1, port2, proto, dir) |
| 5334 | int port1, port2; |
| 5335 | int proto; |
| 5336 | int dir; |
| 5337 | { |
| 5338 | struct block *b0, *b1, *tmp; |
| 5339 | |
| 5340 | /* ip6 proto 'proto' */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5341 | /* XXX - catch the first fragment of a fragmented packet? */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5342 | b0 = gen_cmp(OR_NET, 6, BPF_B, (bpf_int32)proto); |
| 5343 | |
| 5344 | switch (dir) { |
| 5345 | case Q_SRC: |
| 5346 | b1 = gen_portrangeatom6(0, (bpf_int32)port1, (bpf_int32)port2); |
| 5347 | break; |
| 5348 | |
| 5349 | case Q_DST: |
| 5350 | b1 = gen_portrangeatom6(2, (bpf_int32)port1, (bpf_int32)port2); |
| 5351 | break; |
| 5352 | |
| 5353 | case Q_OR: |
| 5354 | case Q_DEFAULT: |
| 5355 | tmp = gen_portrangeatom6(0, (bpf_int32)port1, (bpf_int32)port2); |
| 5356 | b1 = gen_portrangeatom6(2, (bpf_int32)port1, (bpf_int32)port2); |
| 5357 | gen_or(tmp, b1); |
| 5358 | break; |
| 5359 | |
| 5360 | case Q_AND: |
| 5361 | tmp = gen_portrangeatom6(0, (bpf_int32)port1, (bpf_int32)port2); |
| 5362 | b1 = gen_portrangeatom6(2, (bpf_int32)port1, (bpf_int32)port2); |
| 5363 | gen_and(tmp, b1); |
| 5364 | break; |
| 5365 | |
| 5366 | default: |
| 5367 | abort(); |
| 5368 | } |
| 5369 | gen_and(b0, b1); |
| 5370 | |
| 5371 | return b1; |
| 5372 | } |
| 5373 | |
| 5374 | static struct block * |
| 5375 | gen_portrange6(port1, port2, ip_proto, dir) |
| 5376 | int port1, port2; |
| 5377 | int ip_proto; |
| 5378 | int dir; |
| 5379 | { |
| 5380 | struct block *b0, *b1, *tmp; |
| 5381 | |
| 5382 | /* link proto ip6 */ |
| 5383 | b0 = gen_linktype(ETHERTYPE_IPV6); |
| 5384 | |
| 5385 | switch (ip_proto) { |
| 5386 | case IPPROTO_UDP: |
| 5387 | case IPPROTO_TCP: |
| 5388 | case IPPROTO_SCTP: |
| 5389 | b1 = gen_portrangeop6(port1, port2, ip_proto, dir); |
| 5390 | break; |
| 5391 | |
| 5392 | case PROTO_UNDEF: |
| 5393 | tmp = gen_portrangeop6(port1, port2, IPPROTO_TCP, dir); |
| 5394 | b1 = gen_portrangeop6(port1, port2, IPPROTO_UDP, dir); |
| 5395 | gen_or(tmp, b1); |
| 5396 | tmp = gen_portrangeop6(port1, port2, IPPROTO_SCTP, dir); |
| 5397 | gen_or(tmp, b1); |
| 5398 | break; |
| 5399 | |
| 5400 | default: |
| 5401 | abort(); |
| 5402 | } |
| 5403 | gen_and(b0, b1); |
| 5404 | return b1; |
| 5405 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5406 | |
| 5407 | static int |
| 5408 | lookup_proto(name, proto) |
| 5409 | register const char *name; |
| 5410 | register int proto; |
| 5411 | { |
| 5412 | register int v; |
| 5413 | |
| 5414 | switch (proto) { |
| 5415 | |
| 5416 | case Q_DEFAULT: |
| 5417 | case Q_IP: |
| 5418 | case Q_IPV6: |
| 5419 | v = pcap_nametoproto(name); |
| 5420 | if (v == PROTO_UNDEF) |
| 5421 | bpf_error("unknown ip proto '%s'", name); |
| 5422 | break; |
| 5423 | |
| 5424 | case Q_LINK: |
| 5425 | /* XXX should look up h/w protocol type based on linktype */ |
| 5426 | v = pcap_nametoeproto(name); |
| 5427 | if (v == PROTO_UNDEF) { |
| 5428 | v = pcap_nametollc(name); |
| 5429 | if (v == PROTO_UNDEF) |
| 5430 | bpf_error("unknown ether proto '%s'", name); |
| 5431 | } |
| 5432 | break; |
| 5433 | |
| 5434 | case Q_ISO: |
| 5435 | if (strcmp(name, "esis") == 0) |
| 5436 | v = ISO9542_ESIS; |
| 5437 | else if (strcmp(name, "isis") == 0) |
| 5438 | v = ISO10589_ISIS; |
| 5439 | else if (strcmp(name, "clnp") == 0) |
| 5440 | v = ISO8473_CLNP; |
| 5441 | else |
| 5442 | bpf_error("unknown osi proto '%s'", name); |
| 5443 | break; |
| 5444 | |
| 5445 | default: |
| 5446 | v = PROTO_UNDEF; |
| 5447 | break; |
| 5448 | } |
| 5449 | return v; |
| 5450 | } |
| 5451 | |
| 5452 | #if 0 |
| 5453 | struct stmt * |
| 5454 | gen_joinsp(s, n) |
| 5455 | struct stmt **s; |
| 5456 | int n; |
| 5457 | { |
| 5458 | return NULL; |
| 5459 | } |
| 5460 | #endif |
| 5461 | |
| 5462 | static struct block * |
| 5463 | gen_protochain(v, proto, dir) |
| 5464 | int v; |
| 5465 | int proto; |
| 5466 | int dir; |
| 5467 | { |
| 5468 | #ifdef NO_PROTOCHAIN |
| 5469 | return gen_proto(v, proto, dir); |
| 5470 | #else |
| 5471 | struct block *b0, *b; |
| 5472 | struct slist *s[100]; |
| 5473 | int fix2, fix3, fix4, fix5; |
| 5474 | int ahcheck, again, end; |
| 5475 | int i, max; |
| 5476 | int reg2 = alloc_reg(); |
| 5477 | |
| 5478 | memset(s, 0, sizeof(s)); |
| 5479 | fix2 = fix3 = fix4 = fix5 = 0; |
| 5480 | |
| 5481 | switch (proto) { |
| 5482 | case Q_IP: |
| 5483 | case Q_IPV6: |
| 5484 | break; |
| 5485 | case Q_DEFAULT: |
| 5486 | b0 = gen_protochain(v, Q_IP, dir); |
| 5487 | b = gen_protochain(v, Q_IPV6, dir); |
| 5488 | gen_or(b0, b); |
| 5489 | return b; |
| 5490 | default: |
| 5491 | bpf_error("bad protocol applied for 'protochain'"); |
| 5492 | /*NOTREACHED*/ |
| 5493 | } |
| 5494 | |
| 5495 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5496 | * We don't handle variable-length prefixes before the link-layer |
| 5497 | * header, or variable-length link-layer headers, here yet. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5498 | * We might want to add BPF instructions to do the protochain |
| 5499 | * work, to simplify that and, on platforms that have a BPF |
| 5500 | * interpreter with the new instructions, let the filtering |
| 5501 | * be done in the kernel. (We already require a modified BPF |
| 5502 | * engine to do the protochain stuff, to support backward |
| 5503 | * branches, and backward branch support is unlikely to appear |
| 5504 | * in kernel BPF engines.) |
| 5505 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5506 | switch (linktype) { |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5507 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5508 | case DLT_IEEE802_11: |
| 5509 | case DLT_PRISM_HEADER: |
| 5510 | case DLT_IEEE802_11_RADIO_AVS: |
| 5511 | case DLT_IEEE802_11_RADIO: |
| 5512 | case DLT_PPI: |
| 5513 | bpf_error("'protochain' not supported with 802.11"); |
| 5514 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5515 | |
| 5516 | no_optimize = 1; /*this code is not compatible with optimzer yet */ |
| 5517 | |
| 5518 | /* |
| 5519 | * s[0] is a dummy entry to protect other BPF insn from damage |
| 5520 | * by s[fix] = foo with uninitialized variable "fix". It is somewhat |
| 5521 | * hard to find interdependency made by jump table fixup. |
| 5522 | */ |
| 5523 | i = 0; |
| 5524 | s[i] = new_stmt(0); /*dummy*/ |
| 5525 | i++; |
| 5526 | |
| 5527 | switch (proto) { |
| 5528 | case Q_IP: |
| 5529 | b0 = gen_linktype(ETHERTYPE_IP); |
| 5530 | |
| 5531 | /* A = ip->ip_p */ |
| 5532 | s[i] = new_stmt(BPF_LD|BPF_ABS|BPF_B); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5533 | s[i]->s.k = off_macpl + off_nl + 9; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5534 | i++; |
| 5535 | /* X = ip->ip_hl << 2 */ |
| 5536 | s[i] = new_stmt(BPF_LDX|BPF_MSH|BPF_B); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5537 | s[i]->s.k = off_macpl + off_nl; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5538 | i++; |
| 5539 | break; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5540 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5541 | case Q_IPV6: |
| 5542 | b0 = gen_linktype(ETHERTYPE_IPV6); |
| 5543 | |
| 5544 | /* A = ip6->ip_nxt */ |
| 5545 | s[i] = new_stmt(BPF_LD|BPF_ABS|BPF_B); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5546 | s[i]->s.k = off_macpl + off_nl + 6; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5547 | i++; |
| 5548 | /* X = sizeof(struct ip6_hdr) */ |
| 5549 | s[i] = new_stmt(BPF_LDX|BPF_IMM); |
| 5550 | s[i]->s.k = 40; |
| 5551 | i++; |
| 5552 | break; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5553 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5554 | default: |
| 5555 | bpf_error("unsupported proto to gen_protochain"); |
| 5556 | /*NOTREACHED*/ |
| 5557 | } |
| 5558 | |
| 5559 | /* again: if (A == v) goto end; else fall through; */ |
| 5560 | again = i; |
| 5561 | s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K); |
| 5562 | s[i]->s.k = v; |
| 5563 | s[i]->s.jt = NULL; /*later*/ |
| 5564 | s[i]->s.jf = NULL; /*update in next stmt*/ |
| 5565 | fix5 = i; |
| 5566 | i++; |
| 5567 | |
| 5568 | #ifndef IPPROTO_NONE |
| 5569 | #define IPPROTO_NONE 59 |
| 5570 | #endif |
| 5571 | /* if (A == IPPROTO_NONE) goto end */ |
| 5572 | s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K); |
| 5573 | s[i]->s.jt = NULL; /*later*/ |
| 5574 | s[i]->s.jf = NULL; /*update in next stmt*/ |
| 5575 | s[i]->s.k = IPPROTO_NONE; |
| 5576 | s[fix5]->s.jf = s[i]; |
| 5577 | fix2 = i; |
| 5578 | i++; |
| 5579 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5580 | if (proto == Q_IPV6) { |
| 5581 | int v6start, v6end, v6advance, j; |
| 5582 | |
| 5583 | v6start = i; |
| 5584 | /* if (A == IPPROTO_HOPOPTS) goto v6advance */ |
| 5585 | s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K); |
| 5586 | s[i]->s.jt = NULL; /*later*/ |
| 5587 | s[i]->s.jf = NULL; /*update in next stmt*/ |
| 5588 | s[i]->s.k = IPPROTO_HOPOPTS; |
| 5589 | s[fix2]->s.jf = s[i]; |
| 5590 | i++; |
| 5591 | /* if (A == IPPROTO_DSTOPTS) goto v6advance */ |
| 5592 | s[i - 1]->s.jf = s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K); |
| 5593 | s[i]->s.jt = NULL; /*later*/ |
| 5594 | s[i]->s.jf = NULL; /*update in next stmt*/ |
| 5595 | s[i]->s.k = IPPROTO_DSTOPTS; |
| 5596 | i++; |
| 5597 | /* if (A == IPPROTO_ROUTING) goto v6advance */ |
| 5598 | s[i - 1]->s.jf = s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K); |
| 5599 | s[i]->s.jt = NULL; /*later*/ |
| 5600 | s[i]->s.jf = NULL; /*update in next stmt*/ |
| 5601 | s[i]->s.k = IPPROTO_ROUTING; |
| 5602 | i++; |
| 5603 | /* if (A == IPPROTO_FRAGMENT) goto v6advance; else goto ahcheck; */ |
| 5604 | s[i - 1]->s.jf = s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K); |
| 5605 | s[i]->s.jt = NULL; /*later*/ |
| 5606 | s[i]->s.jf = NULL; /*later*/ |
| 5607 | s[i]->s.k = IPPROTO_FRAGMENT; |
| 5608 | fix3 = i; |
| 5609 | v6end = i; |
| 5610 | i++; |
| 5611 | |
| 5612 | /* v6advance: */ |
| 5613 | v6advance = i; |
| 5614 | |
| 5615 | /* |
| 5616 | * in short, |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5617 | * A = P[X + packet head]; |
| 5618 | * X = X + (P[X + packet head + 1] + 1) * 8; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5619 | */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5620 | /* A = P[X + packet head] */ |
| 5621 | s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5622 | s[i]->s.k = off_macpl + off_nl; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5623 | i++; |
| 5624 | /* MEM[reg2] = A */ |
| 5625 | s[i] = new_stmt(BPF_ST); |
| 5626 | s[i]->s.k = reg2; |
| 5627 | i++; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5628 | /* A = P[X + packet head + 1]; */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5629 | s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5630 | s[i]->s.k = off_macpl + off_nl + 1; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5631 | i++; |
| 5632 | /* A += 1 */ |
| 5633 | s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K); |
| 5634 | s[i]->s.k = 1; |
| 5635 | i++; |
| 5636 | /* A *= 8 */ |
| 5637 | s[i] = new_stmt(BPF_ALU|BPF_MUL|BPF_K); |
| 5638 | s[i]->s.k = 8; |
| 5639 | i++; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5640 | /* A += X */ |
| 5641 | s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_X); |
| 5642 | s[i]->s.k = 0; |
| 5643 | i++; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5644 | /* X = A; */ |
| 5645 | s[i] = new_stmt(BPF_MISC|BPF_TAX); |
| 5646 | i++; |
| 5647 | /* A = MEM[reg2] */ |
| 5648 | s[i] = new_stmt(BPF_LD|BPF_MEM); |
| 5649 | s[i]->s.k = reg2; |
| 5650 | i++; |
| 5651 | |
| 5652 | /* goto again; (must use BPF_JA for backward jump) */ |
| 5653 | s[i] = new_stmt(BPF_JMP|BPF_JA); |
| 5654 | s[i]->s.k = again - i - 1; |
| 5655 | s[i - 1]->s.jf = s[i]; |
| 5656 | i++; |
| 5657 | |
| 5658 | /* fixup */ |
| 5659 | for (j = v6start; j <= v6end; j++) |
| 5660 | s[j]->s.jt = s[v6advance]; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5661 | } else { |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5662 | /* nop */ |
| 5663 | s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K); |
| 5664 | s[i]->s.k = 0; |
| 5665 | s[fix2]->s.jf = s[i]; |
| 5666 | i++; |
| 5667 | } |
| 5668 | |
| 5669 | /* ahcheck: */ |
| 5670 | ahcheck = i; |
| 5671 | /* if (A == IPPROTO_AH) then fall through; else goto end; */ |
| 5672 | s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K); |
| 5673 | s[i]->s.jt = NULL; /*later*/ |
| 5674 | s[i]->s.jf = NULL; /*later*/ |
| 5675 | s[i]->s.k = IPPROTO_AH; |
| 5676 | if (fix3) |
| 5677 | s[fix3]->s.jf = s[ahcheck]; |
| 5678 | fix4 = i; |
| 5679 | i++; |
| 5680 | |
| 5681 | /* |
| 5682 | * in short, |
| 5683 | * A = P[X]; |
| 5684 | * X = X + (P[X + 1] + 2) * 4; |
| 5685 | */ |
| 5686 | /* A = X */ |
| 5687 | s[i - 1]->s.jt = s[i] = new_stmt(BPF_MISC|BPF_TXA); |
| 5688 | i++; |
| 5689 | /* A = P[X + packet head]; */ |
| 5690 | s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5691 | s[i]->s.k = off_macpl + off_nl; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5692 | i++; |
| 5693 | /* MEM[reg2] = A */ |
| 5694 | s[i] = new_stmt(BPF_ST); |
| 5695 | s[i]->s.k = reg2; |
| 5696 | i++; |
| 5697 | /* A = X */ |
| 5698 | s[i - 1]->s.jt = s[i] = new_stmt(BPF_MISC|BPF_TXA); |
| 5699 | i++; |
| 5700 | /* A += 1 */ |
| 5701 | s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K); |
| 5702 | s[i]->s.k = 1; |
| 5703 | i++; |
| 5704 | /* X = A */ |
| 5705 | s[i] = new_stmt(BPF_MISC|BPF_TAX); |
| 5706 | i++; |
| 5707 | /* A = P[X + packet head] */ |
| 5708 | s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5709 | s[i]->s.k = off_macpl + off_nl; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5710 | i++; |
| 5711 | /* A += 2 */ |
| 5712 | s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K); |
| 5713 | s[i]->s.k = 2; |
| 5714 | i++; |
| 5715 | /* A *= 4 */ |
| 5716 | s[i] = new_stmt(BPF_ALU|BPF_MUL|BPF_K); |
| 5717 | s[i]->s.k = 4; |
| 5718 | i++; |
| 5719 | /* X = A; */ |
| 5720 | s[i] = new_stmt(BPF_MISC|BPF_TAX); |
| 5721 | i++; |
| 5722 | /* A = MEM[reg2] */ |
| 5723 | s[i] = new_stmt(BPF_LD|BPF_MEM); |
| 5724 | s[i]->s.k = reg2; |
| 5725 | i++; |
| 5726 | |
| 5727 | /* goto again; (must use BPF_JA for backward jump) */ |
| 5728 | s[i] = new_stmt(BPF_JMP|BPF_JA); |
| 5729 | s[i]->s.k = again - i - 1; |
| 5730 | i++; |
| 5731 | |
| 5732 | /* end: nop */ |
| 5733 | end = i; |
| 5734 | s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K); |
| 5735 | s[i]->s.k = 0; |
| 5736 | s[fix2]->s.jt = s[end]; |
| 5737 | s[fix4]->s.jf = s[end]; |
| 5738 | s[fix5]->s.jt = s[end]; |
| 5739 | i++; |
| 5740 | |
| 5741 | /* |
| 5742 | * make slist chain |
| 5743 | */ |
| 5744 | max = i; |
| 5745 | for (i = 0; i < max - 1; i++) |
| 5746 | s[i]->next = s[i + 1]; |
| 5747 | s[max - 1]->next = NULL; |
| 5748 | |
| 5749 | /* |
| 5750 | * emit final check |
| 5751 | */ |
| 5752 | b = new_block(JMP(BPF_JEQ)); |
| 5753 | b->stmts = s[1]; /*remember, s[0] is dummy*/ |
| 5754 | b->s.k = v; |
| 5755 | |
| 5756 | free_reg(reg2); |
| 5757 | |
| 5758 | gen_and(b0, b); |
| 5759 | return b; |
| 5760 | #endif |
| 5761 | } |
| 5762 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5763 | static struct block * |
| 5764 | gen_check_802_11_data_frame() |
| 5765 | { |
| 5766 | struct slist *s; |
| 5767 | struct block *b0, *b1; |
| 5768 | |
| 5769 | /* |
| 5770 | * A data frame has the 0x08 bit (b3) in the frame control field set |
| 5771 | * and the 0x04 bit (b2) clear. |
| 5772 | */ |
| 5773 | s = gen_load_a(OR_LINK, 0, BPF_B); |
| 5774 | b0 = new_block(JMP(BPF_JSET)); |
| 5775 | b0->s.k = 0x08; |
| 5776 | b0->stmts = s; |
| 5777 | |
| 5778 | s = gen_load_a(OR_LINK, 0, BPF_B); |
| 5779 | b1 = new_block(JMP(BPF_JSET)); |
| 5780 | b1->s.k = 0x04; |
| 5781 | b1->stmts = s; |
| 5782 | gen_not(b1); |
| 5783 | |
| 5784 | gen_and(b1, b0); |
| 5785 | |
| 5786 | return b0; |
| 5787 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5788 | |
| 5789 | /* |
| 5790 | * Generate code that checks whether the packet is a packet for protocol |
| 5791 | * <proto> and whether the type field in that protocol's header has |
| 5792 | * the value <v>, e.g. if <proto> is Q_IP, it checks whether it's an |
| 5793 | * IP packet and checks the protocol number in the IP header against <v>. |
| 5794 | * |
| 5795 | * If <proto> is Q_DEFAULT, i.e. just "proto" was specified, it checks |
| 5796 | * against Q_IP and Q_IPV6. |
| 5797 | */ |
| 5798 | static struct block * |
| 5799 | gen_proto(v, proto, dir) |
| 5800 | int v; |
| 5801 | int proto; |
| 5802 | int dir; |
| 5803 | { |
| 5804 | struct block *b0, *b1; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5805 | #ifndef CHASE_CHAIN |
| 5806 | struct block *b2; |
| 5807 | #endif |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5808 | |
| 5809 | if (dir != Q_DEFAULT) |
| 5810 | bpf_error("direction applied to 'proto'"); |
| 5811 | |
| 5812 | switch (proto) { |
| 5813 | case Q_DEFAULT: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5814 | b0 = gen_proto(v, Q_IP, dir); |
| 5815 | b1 = gen_proto(v, Q_IPV6, dir); |
| 5816 | gen_or(b0, b1); |
| 5817 | return b1; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5818 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5819 | case Q_IP: |
| 5820 | /* |
| 5821 | * For FDDI, RFC 1188 says that SNAP encapsulation is used, |
| 5822 | * not LLC encapsulation with LLCSAP_IP. |
| 5823 | * |
| 5824 | * For IEEE 802 networks - which includes 802.5 token ring |
| 5825 | * (which is what DLT_IEEE802 means) and 802.11 - RFC 1042 |
| 5826 | * says that SNAP encapsulation is used, not LLC encapsulation |
| 5827 | * with LLCSAP_IP. |
| 5828 | * |
| 5829 | * For LLC-encapsulated ATM/"Classical IP", RFC 1483 and |
| 5830 | * RFC 2225 say that SNAP encapsulation is used, not LLC |
| 5831 | * encapsulation with LLCSAP_IP. |
| 5832 | * |
| 5833 | * So we always check for ETHERTYPE_IP. |
| 5834 | */ |
| 5835 | b0 = gen_linktype(ETHERTYPE_IP); |
| 5836 | #ifndef CHASE_CHAIN |
| 5837 | b1 = gen_cmp(OR_NET, 9, BPF_B, (bpf_int32)v); |
| 5838 | #else |
| 5839 | b1 = gen_protochain(v, Q_IP); |
| 5840 | #endif |
| 5841 | gen_and(b0, b1); |
| 5842 | return b1; |
| 5843 | |
| 5844 | case Q_ISO: |
| 5845 | switch (linktype) { |
| 5846 | |
| 5847 | case DLT_FRELAY: |
| 5848 | /* |
| 5849 | * Frame Relay packets typically have an OSI |
| 5850 | * NLPID at the beginning; "gen_linktype(LLCSAP_ISONS)" |
| 5851 | * generates code to check for all the OSI |
| 5852 | * NLPIDs, so calling it and then adding a check |
| 5853 | * for the particular NLPID for which we're |
| 5854 | * looking is bogus, as we can just check for |
| 5855 | * the NLPID. |
| 5856 | * |
| 5857 | * What we check for is the NLPID and a frame |
| 5858 | * control field value of UI, i.e. 0x03 followed |
| 5859 | * by the NLPID. |
| 5860 | * |
| 5861 | * XXX - assumes a 2-byte Frame Relay header with |
| 5862 | * DLCI and flags. What if the address is longer? |
| 5863 | * |
| 5864 | * XXX - what about SNAP-encapsulated frames? |
| 5865 | */ |
| 5866 | return gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | v); |
| 5867 | /*NOTREACHED*/ |
| 5868 | break; |
| 5869 | |
| 5870 | case DLT_C_HDLC: |
| 5871 | /* |
| 5872 | * Cisco uses an Ethertype lookalike - for OSI, |
| 5873 | * it's 0xfefe. |
| 5874 | */ |
| 5875 | b0 = gen_linktype(LLCSAP_ISONS<<8 | LLCSAP_ISONS); |
| 5876 | /* OSI in C-HDLC is stuffed with a fudge byte */ |
| 5877 | b1 = gen_cmp(OR_NET_NOSNAP, 1, BPF_B, (long)v); |
| 5878 | gen_and(b0, b1); |
| 5879 | return b1; |
| 5880 | |
| 5881 | default: |
| 5882 | b0 = gen_linktype(LLCSAP_ISONS); |
| 5883 | b1 = gen_cmp(OR_NET_NOSNAP, 0, BPF_B, (long)v); |
| 5884 | gen_and(b0, b1); |
| 5885 | return b1; |
| 5886 | } |
| 5887 | |
| 5888 | case Q_ISIS: |
| 5889 | b0 = gen_proto(ISO10589_ISIS, Q_ISO, Q_DEFAULT); |
| 5890 | /* |
| 5891 | * 4 is the offset of the PDU type relative to the IS-IS |
| 5892 | * header. |
| 5893 | */ |
| 5894 | b1 = gen_cmp(OR_NET_NOSNAP, 4, BPF_B, (long)v); |
| 5895 | gen_and(b0, b1); |
| 5896 | return b1; |
| 5897 | |
| 5898 | case Q_ARP: |
| 5899 | bpf_error("arp does not encapsulate another protocol"); |
| 5900 | /* NOTREACHED */ |
| 5901 | |
| 5902 | case Q_RARP: |
| 5903 | bpf_error("rarp does not encapsulate another protocol"); |
| 5904 | /* NOTREACHED */ |
| 5905 | |
| 5906 | case Q_ATALK: |
| 5907 | bpf_error("atalk encapsulation is not specifiable"); |
| 5908 | /* NOTREACHED */ |
| 5909 | |
| 5910 | case Q_DECNET: |
| 5911 | bpf_error("decnet encapsulation is not specifiable"); |
| 5912 | /* NOTREACHED */ |
| 5913 | |
| 5914 | case Q_SCA: |
| 5915 | bpf_error("sca does not encapsulate another protocol"); |
| 5916 | /* NOTREACHED */ |
| 5917 | |
| 5918 | case Q_LAT: |
| 5919 | bpf_error("lat does not encapsulate another protocol"); |
| 5920 | /* NOTREACHED */ |
| 5921 | |
| 5922 | case Q_MOPRC: |
| 5923 | bpf_error("moprc does not encapsulate another protocol"); |
| 5924 | /* NOTREACHED */ |
| 5925 | |
| 5926 | case Q_MOPDL: |
| 5927 | bpf_error("mopdl does not encapsulate another protocol"); |
| 5928 | /* NOTREACHED */ |
| 5929 | |
| 5930 | case Q_LINK: |
| 5931 | return gen_linktype(v); |
| 5932 | |
| 5933 | case Q_UDP: |
| 5934 | bpf_error("'udp proto' is bogus"); |
| 5935 | /* NOTREACHED */ |
| 5936 | |
| 5937 | case Q_TCP: |
| 5938 | bpf_error("'tcp proto' is bogus"); |
| 5939 | /* NOTREACHED */ |
| 5940 | |
| 5941 | case Q_SCTP: |
| 5942 | bpf_error("'sctp proto' is bogus"); |
| 5943 | /* NOTREACHED */ |
| 5944 | |
| 5945 | case Q_ICMP: |
| 5946 | bpf_error("'icmp proto' is bogus"); |
| 5947 | /* NOTREACHED */ |
| 5948 | |
| 5949 | case Q_IGMP: |
| 5950 | bpf_error("'igmp proto' is bogus"); |
| 5951 | /* NOTREACHED */ |
| 5952 | |
| 5953 | case Q_IGRP: |
| 5954 | bpf_error("'igrp proto' is bogus"); |
| 5955 | /* NOTREACHED */ |
| 5956 | |
| 5957 | case Q_PIM: |
| 5958 | bpf_error("'pim proto' is bogus"); |
| 5959 | /* NOTREACHED */ |
| 5960 | |
| 5961 | case Q_VRRP: |
| 5962 | bpf_error("'vrrp proto' is bogus"); |
| 5963 | /* NOTREACHED */ |
| 5964 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5965 | case Q_CARP: |
| 5966 | bpf_error("'carp proto' is bogus"); |
| 5967 | /* NOTREACHED */ |
| 5968 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5969 | case Q_IPV6: |
| 5970 | b0 = gen_linktype(ETHERTYPE_IPV6); |
| 5971 | #ifndef CHASE_CHAIN |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 5972 | /* |
| 5973 | * Also check for a fragment header before the final |
| 5974 | * header. |
| 5975 | */ |
| 5976 | b2 = gen_cmp(OR_NET, 6, BPF_B, IPPROTO_FRAGMENT); |
| 5977 | b1 = gen_cmp(OR_NET, 40, BPF_B, (bpf_int32)v); |
| 5978 | gen_and(b2, b1); |
| 5979 | b2 = gen_cmp(OR_NET, 6, BPF_B, (bpf_int32)v); |
| 5980 | gen_or(b2, b1); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5981 | #else |
| 5982 | b1 = gen_protochain(v, Q_IPV6); |
| 5983 | #endif |
| 5984 | gen_and(b0, b1); |
| 5985 | return b1; |
| 5986 | |
| 5987 | case Q_ICMPV6: |
| 5988 | bpf_error("'icmp6 proto' is bogus"); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5989 | |
| 5990 | case Q_AH: |
| 5991 | bpf_error("'ah proto' is bogus"); |
| 5992 | |
| 5993 | case Q_ESP: |
| 5994 | bpf_error("'ah proto' is bogus"); |
| 5995 | |
| 5996 | case Q_STP: |
| 5997 | bpf_error("'stp proto' is bogus"); |
| 5998 | |
| 5999 | case Q_IPX: |
| 6000 | bpf_error("'ipx proto' is bogus"); |
| 6001 | |
| 6002 | case Q_NETBEUI: |
| 6003 | bpf_error("'netbeui proto' is bogus"); |
| 6004 | |
| 6005 | case Q_RADIO: |
| 6006 | bpf_error("'radio proto' is bogus"); |
| 6007 | |
| 6008 | default: |
| 6009 | abort(); |
| 6010 | /* NOTREACHED */ |
| 6011 | } |
| 6012 | /* NOTREACHED */ |
| 6013 | } |
| 6014 | |
| 6015 | struct block * |
| 6016 | gen_scode(name, q) |
| 6017 | register const char *name; |
| 6018 | struct qual q; |
| 6019 | { |
| 6020 | int proto = q.proto; |
| 6021 | int dir = q.dir; |
| 6022 | int tproto; |
| 6023 | u_char *eaddr; |
| 6024 | bpf_u_int32 mask, addr; |
| 6025 | #ifndef INET6 |
| 6026 | bpf_u_int32 **alist; |
| 6027 | #else |
| 6028 | int tproto6; |
| 6029 | struct sockaddr_in *sin4; |
| 6030 | struct sockaddr_in6 *sin6; |
| 6031 | struct addrinfo *res, *res0; |
| 6032 | struct in6_addr mask128; |
| 6033 | #endif /*INET6*/ |
| 6034 | struct block *b, *tmp; |
| 6035 | int port, real_proto; |
| 6036 | int port1, port2; |
| 6037 | |
| 6038 | switch (q.addr) { |
| 6039 | |
| 6040 | case Q_NET: |
| 6041 | addr = pcap_nametonetaddr(name); |
| 6042 | if (addr == 0) |
| 6043 | bpf_error("unknown network '%s'", name); |
| 6044 | /* Left justify network addr and calculate its network mask */ |
| 6045 | mask = 0xffffffff; |
| 6046 | while (addr && (addr & 0xff000000) == 0) { |
| 6047 | addr <<= 8; |
| 6048 | mask <<= 8; |
| 6049 | } |
| 6050 | return gen_host(addr, mask, proto, dir, q.addr); |
| 6051 | |
| 6052 | case Q_DEFAULT: |
| 6053 | case Q_HOST: |
| 6054 | if (proto == Q_LINK) { |
| 6055 | switch (linktype) { |
| 6056 | |
| 6057 | case DLT_EN10MB: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6058 | case DLT_NETANALYZER: |
| 6059 | case DLT_NETANALYZER_TRANSPARENT: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6060 | eaddr = pcap_ether_hostton(name); |
| 6061 | if (eaddr == NULL) |
| 6062 | bpf_error( |
| 6063 | "unknown ether host '%s'", name); |
| 6064 | b = gen_ehostop(eaddr, dir); |
| 6065 | free(eaddr); |
| 6066 | return b; |
| 6067 | |
| 6068 | case DLT_FDDI: |
| 6069 | eaddr = pcap_ether_hostton(name); |
| 6070 | if (eaddr == NULL) |
| 6071 | bpf_error( |
| 6072 | "unknown FDDI host '%s'", name); |
| 6073 | b = gen_fhostop(eaddr, dir); |
| 6074 | free(eaddr); |
| 6075 | return b; |
| 6076 | |
| 6077 | case DLT_IEEE802: |
| 6078 | eaddr = pcap_ether_hostton(name); |
| 6079 | if (eaddr == NULL) |
| 6080 | bpf_error( |
| 6081 | "unknown token ring host '%s'", name); |
| 6082 | b = gen_thostop(eaddr, dir); |
| 6083 | free(eaddr); |
| 6084 | return b; |
| 6085 | |
| 6086 | case DLT_IEEE802_11: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6087 | case DLT_PRISM_HEADER: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6088 | case DLT_IEEE802_11_RADIO_AVS: |
| 6089 | case DLT_IEEE802_11_RADIO: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6090 | case DLT_PPI: |
| 6091 | eaddr = pcap_ether_hostton(name); |
| 6092 | if (eaddr == NULL) |
| 6093 | bpf_error( |
| 6094 | "unknown 802.11 host '%s'", name); |
| 6095 | b = gen_wlanhostop(eaddr, dir); |
| 6096 | free(eaddr); |
| 6097 | return b; |
| 6098 | |
| 6099 | case DLT_IP_OVER_FC: |
| 6100 | eaddr = pcap_ether_hostton(name); |
| 6101 | if (eaddr == NULL) |
| 6102 | bpf_error( |
| 6103 | "unknown Fibre Channel host '%s'", name); |
| 6104 | b = gen_ipfchostop(eaddr, dir); |
| 6105 | free(eaddr); |
| 6106 | return b; |
| 6107 | |
| 6108 | case DLT_SUNATM: |
| 6109 | if (!is_lane) |
| 6110 | break; |
| 6111 | |
| 6112 | /* |
| 6113 | * Check that the packet doesn't begin |
| 6114 | * with an LE Control marker. (We've |
| 6115 | * already generated a test for LANE.) |
| 6116 | */ |
| 6117 | tmp = gen_cmp(OR_LINK, SUNATM_PKT_BEGIN_POS, |
| 6118 | BPF_H, 0xFF00); |
| 6119 | gen_not(tmp); |
| 6120 | |
| 6121 | eaddr = pcap_ether_hostton(name); |
| 6122 | if (eaddr == NULL) |
| 6123 | bpf_error( |
| 6124 | "unknown ether host '%s'", name); |
| 6125 | b = gen_ehostop(eaddr, dir); |
| 6126 | gen_and(tmp, b); |
| 6127 | free(eaddr); |
| 6128 | return b; |
| 6129 | } |
| 6130 | |
| 6131 | bpf_error("only ethernet/FDDI/token ring/802.11/ATM LANE/Fibre Channel supports link-level host name"); |
| 6132 | } else if (proto == Q_DECNET) { |
| 6133 | unsigned short dn_addr = __pcap_nametodnaddr(name); |
| 6134 | /* |
| 6135 | * I don't think DECNET hosts can be multihomed, so |
| 6136 | * there is no need to build up a list of addresses |
| 6137 | */ |
| 6138 | return (gen_host(dn_addr, 0, proto, dir, q.addr)); |
| 6139 | } else { |
| 6140 | #ifndef INET6 |
| 6141 | alist = pcap_nametoaddr(name); |
| 6142 | if (alist == NULL || *alist == NULL) |
| 6143 | bpf_error("unknown host '%s'", name); |
| 6144 | tproto = proto; |
| 6145 | if (off_linktype == (u_int)-1 && tproto == Q_DEFAULT) |
| 6146 | tproto = Q_IP; |
| 6147 | b = gen_host(**alist++, 0xffffffff, tproto, dir, q.addr); |
| 6148 | while (*alist) { |
| 6149 | tmp = gen_host(**alist++, 0xffffffff, |
| 6150 | tproto, dir, q.addr); |
| 6151 | gen_or(b, tmp); |
| 6152 | b = tmp; |
| 6153 | } |
| 6154 | return b; |
| 6155 | #else |
| 6156 | memset(&mask128, 0xff, sizeof(mask128)); |
| 6157 | res0 = res = pcap_nametoaddrinfo(name); |
| 6158 | if (res == NULL) |
| 6159 | bpf_error("unknown host '%s'", name); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6160 | ai = res; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6161 | b = tmp = NULL; |
| 6162 | tproto = tproto6 = proto; |
| 6163 | if (off_linktype == -1 && tproto == Q_DEFAULT) { |
| 6164 | tproto = Q_IP; |
| 6165 | tproto6 = Q_IPV6; |
| 6166 | } |
| 6167 | for (res = res0; res; res = res->ai_next) { |
| 6168 | switch (res->ai_family) { |
| 6169 | case AF_INET: |
| 6170 | if (tproto == Q_IPV6) |
| 6171 | continue; |
| 6172 | |
| 6173 | sin4 = (struct sockaddr_in *) |
| 6174 | res->ai_addr; |
| 6175 | tmp = gen_host(ntohl(sin4->sin_addr.s_addr), |
| 6176 | 0xffffffff, tproto, dir, q.addr); |
| 6177 | break; |
| 6178 | case AF_INET6: |
| 6179 | if (tproto6 == Q_IP) |
| 6180 | continue; |
| 6181 | |
| 6182 | sin6 = (struct sockaddr_in6 *) |
| 6183 | res->ai_addr; |
| 6184 | tmp = gen_host6(&sin6->sin6_addr, |
| 6185 | &mask128, tproto6, dir, q.addr); |
| 6186 | break; |
| 6187 | default: |
| 6188 | continue; |
| 6189 | } |
| 6190 | if (b) |
| 6191 | gen_or(b, tmp); |
| 6192 | b = tmp; |
| 6193 | } |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6194 | ai = NULL; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6195 | freeaddrinfo(res0); |
| 6196 | if (b == NULL) { |
| 6197 | bpf_error("unknown host '%s'%s", name, |
| 6198 | (proto == Q_DEFAULT) |
| 6199 | ? "" |
| 6200 | : " for specified address family"); |
| 6201 | } |
| 6202 | return b; |
| 6203 | #endif /*INET6*/ |
| 6204 | } |
| 6205 | |
| 6206 | case Q_PORT: |
| 6207 | if (proto != Q_DEFAULT && |
| 6208 | proto != Q_UDP && proto != Q_TCP && proto != Q_SCTP) |
| 6209 | bpf_error("illegal qualifier of 'port'"); |
| 6210 | if (pcap_nametoport(name, &port, &real_proto) == 0) |
| 6211 | bpf_error("unknown port '%s'", name); |
| 6212 | if (proto == Q_UDP) { |
| 6213 | if (real_proto == IPPROTO_TCP) |
| 6214 | bpf_error("port '%s' is tcp", name); |
| 6215 | else if (real_proto == IPPROTO_SCTP) |
| 6216 | bpf_error("port '%s' is sctp", name); |
| 6217 | else |
| 6218 | /* override PROTO_UNDEF */ |
| 6219 | real_proto = IPPROTO_UDP; |
| 6220 | } |
| 6221 | if (proto == Q_TCP) { |
| 6222 | if (real_proto == IPPROTO_UDP) |
| 6223 | bpf_error("port '%s' is udp", name); |
| 6224 | |
| 6225 | else if (real_proto == IPPROTO_SCTP) |
| 6226 | bpf_error("port '%s' is sctp", name); |
| 6227 | else |
| 6228 | /* override PROTO_UNDEF */ |
| 6229 | real_proto = IPPROTO_TCP; |
| 6230 | } |
| 6231 | if (proto == Q_SCTP) { |
| 6232 | if (real_proto == IPPROTO_UDP) |
| 6233 | bpf_error("port '%s' is udp", name); |
| 6234 | |
| 6235 | else if (real_proto == IPPROTO_TCP) |
| 6236 | bpf_error("port '%s' is tcp", name); |
| 6237 | else |
| 6238 | /* override PROTO_UNDEF */ |
| 6239 | real_proto = IPPROTO_SCTP; |
| 6240 | } |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6241 | if (port < 0) |
| 6242 | bpf_error("illegal port number %d < 0", port); |
| 6243 | if (port > 65535) |
| 6244 | bpf_error("illegal port number %d > 65535", port); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6245 | b = gen_port(port, real_proto, dir); |
| 6246 | gen_or(gen_port6(port, real_proto, dir), b); |
| 6247 | return b; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6248 | |
| 6249 | case Q_PORTRANGE: |
| 6250 | if (proto != Q_DEFAULT && |
| 6251 | proto != Q_UDP && proto != Q_TCP && proto != Q_SCTP) |
| 6252 | bpf_error("illegal qualifier of 'portrange'"); |
| 6253 | if (pcap_nametoportrange(name, &port1, &port2, &real_proto) == 0) |
| 6254 | bpf_error("unknown port in range '%s'", name); |
| 6255 | if (proto == Q_UDP) { |
| 6256 | if (real_proto == IPPROTO_TCP) |
| 6257 | bpf_error("port in range '%s' is tcp", name); |
| 6258 | else if (real_proto == IPPROTO_SCTP) |
| 6259 | bpf_error("port in range '%s' is sctp", name); |
| 6260 | else |
| 6261 | /* override PROTO_UNDEF */ |
| 6262 | real_proto = IPPROTO_UDP; |
| 6263 | } |
| 6264 | if (proto == Q_TCP) { |
| 6265 | if (real_proto == IPPROTO_UDP) |
| 6266 | bpf_error("port in range '%s' is udp", name); |
| 6267 | else if (real_proto == IPPROTO_SCTP) |
| 6268 | bpf_error("port in range '%s' is sctp", name); |
| 6269 | else |
| 6270 | /* override PROTO_UNDEF */ |
| 6271 | real_proto = IPPROTO_TCP; |
| 6272 | } |
| 6273 | if (proto == Q_SCTP) { |
| 6274 | if (real_proto == IPPROTO_UDP) |
| 6275 | bpf_error("port in range '%s' is udp", name); |
| 6276 | else if (real_proto == IPPROTO_TCP) |
| 6277 | bpf_error("port in range '%s' is tcp", name); |
| 6278 | else |
| 6279 | /* override PROTO_UNDEF */ |
| 6280 | real_proto = IPPROTO_SCTP; |
| 6281 | } |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6282 | if (port1 < 0) |
| 6283 | bpf_error("illegal port number %d < 0", port1); |
| 6284 | if (port1 > 65535) |
| 6285 | bpf_error("illegal port number %d > 65535", port1); |
| 6286 | if (port2 < 0) |
| 6287 | bpf_error("illegal port number %d < 0", port2); |
| 6288 | if (port2 > 65535) |
| 6289 | bpf_error("illegal port number %d > 65535", port2); |
| 6290 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6291 | b = gen_portrange(port1, port2, real_proto, dir); |
| 6292 | gen_or(gen_portrange6(port1, port2, real_proto, dir), b); |
| 6293 | return b; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6294 | |
| 6295 | case Q_GATEWAY: |
| 6296 | #ifndef INET6 |
| 6297 | eaddr = pcap_ether_hostton(name); |
| 6298 | if (eaddr == NULL) |
| 6299 | bpf_error("unknown ether host: %s", name); |
| 6300 | |
| 6301 | alist = pcap_nametoaddr(name); |
| 6302 | if (alist == NULL || *alist == NULL) |
| 6303 | bpf_error("unknown host '%s'", name); |
| 6304 | b = gen_gateway(eaddr, alist, proto, dir); |
| 6305 | free(eaddr); |
| 6306 | return b; |
| 6307 | #else |
| 6308 | bpf_error("'gateway' not supported in this configuration"); |
| 6309 | #endif /*INET6*/ |
| 6310 | |
| 6311 | case Q_PROTO: |
| 6312 | real_proto = lookup_proto(name, proto); |
| 6313 | if (real_proto >= 0) |
| 6314 | return gen_proto(real_proto, proto, dir); |
| 6315 | else |
| 6316 | bpf_error("unknown protocol: %s", name); |
| 6317 | |
| 6318 | case Q_PROTOCHAIN: |
| 6319 | real_proto = lookup_proto(name, proto); |
| 6320 | if (real_proto >= 0) |
| 6321 | return gen_protochain(real_proto, proto, dir); |
| 6322 | else |
| 6323 | bpf_error("unknown protocol: %s", name); |
| 6324 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6325 | case Q_UNDEF: |
| 6326 | syntax(); |
| 6327 | /* NOTREACHED */ |
| 6328 | } |
| 6329 | abort(); |
| 6330 | /* NOTREACHED */ |
| 6331 | } |
| 6332 | |
| 6333 | struct block * |
| 6334 | gen_mcode(s1, s2, masklen, q) |
| 6335 | register const char *s1, *s2; |
| 6336 | register int masklen; |
| 6337 | struct qual q; |
| 6338 | { |
| 6339 | register int nlen, mlen; |
| 6340 | bpf_u_int32 n, m; |
| 6341 | |
| 6342 | nlen = __pcap_atoin(s1, &n); |
| 6343 | /* Promote short ipaddr */ |
| 6344 | n <<= 32 - nlen; |
| 6345 | |
| 6346 | if (s2 != NULL) { |
| 6347 | mlen = __pcap_atoin(s2, &m); |
| 6348 | /* Promote short ipaddr */ |
| 6349 | m <<= 32 - mlen; |
| 6350 | if ((n & ~m) != 0) |
| 6351 | bpf_error("non-network bits set in \"%s mask %s\"", |
| 6352 | s1, s2); |
| 6353 | } else { |
| 6354 | /* Convert mask len to mask */ |
| 6355 | if (masklen > 32) |
| 6356 | bpf_error("mask length must be <= 32"); |
| 6357 | if (masklen == 0) { |
| 6358 | /* |
| 6359 | * X << 32 is not guaranteed by C to be 0; it's |
| 6360 | * undefined. |
| 6361 | */ |
| 6362 | m = 0; |
| 6363 | } else |
| 6364 | m = 0xffffffff << (32 - masklen); |
| 6365 | if ((n & ~m) != 0) |
| 6366 | bpf_error("non-network bits set in \"%s/%d\"", |
| 6367 | s1, masklen); |
| 6368 | } |
| 6369 | |
| 6370 | switch (q.addr) { |
| 6371 | |
| 6372 | case Q_NET: |
| 6373 | return gen_host(n, m, q.proto, q.dir, q.addr); |
| 6374 | |
| 6375 | default: |
| 6376 | bpf_error("Mask syntax for networks only"); |
| 6377 | /* NOTREACHED */ |
| 6378 | } |
| 6379 | /* NOTREACHED */ |
| 6380 | return NULL; |
| 6381 | } |
| 6382 | |
| 6383 | struct block * |
| 6384 | gen_ncode(s, v, q) |
| 6385 | register const char *s; |
| 6386 | bpf_u_int32 v; |
| 6387 | struct qual q; |
| 6388 | { |
| 6389 | bpf_u_int32 mask; |
| 6390 | int proto = q.proto; |
| 6391 | int dir = q.dir; |
| 6392 | register int vlen; |
| 6393 | |
| 6394 | if (s == NULL) |
| 6395 | vlen = 32; |
| 6396 | else if (q.proto == Q_DECNET) |
| 6397 | vlen = __pcap_atodn(s, &v); |
| 6398 | else |
| 6399 | vlen = __pcap_atoin(s, &v); |
| 6400 | |
| 6401 | switch (q.addr) { |
| 6402 | |
| 6403 | case Q_DEFAULT: |
| 6404 | case Q_HOST: |
| 6405 | case Q_NET: |
| 6406 | if (proto == Q_DECNET) |
| 6407 | return gen_host(v, 0, proto, dir, q.addr); |
| 6408 | else if (proto == Q_LINK) { |
| 6409 | bpf_error("illegal link layer address"); |
| 6410 | } else { |
| 6411 | mask = 0xffffffff; |
| 6412 | if (s == NULL && q.addr == Q_NET) { |
| 6413 | /* Promote short net number */ |
| 6414 | while (v && (v & 0xff000000) == 0) { |
| 6415 | v <<= 8; |
| 6416 | mask <<= 8; |
| 6417 | } |
| 6418 | } else { |
| 6419 | /* Promote short ipaddr */ |
| 6420 | v <<= 32 - vlen; |
| 6421 | mask <<= 32 - vlen; |
| 6422 | } |
| 6423 | return gen_host(v, mask, proto, dir, q.addr); |
| 6424 | } |
| 6425 | |
| 6426 | case Q_PORT: |
| 6427 | if (proto == Q_UDP) |
| 6428 | proto = IPPROTO_UDP; |
| 6429 | else if (proto == Q_TCP) |
| 6430 | proto = IPPROTO_TCP; |
| 6431 | else if (proto == Q_SCTP) |
| 6432 | proto = IPPROTO_SCTP; |
| 6433 | else if (proto == Q_DEFAULT) |
| 6434 | proto = PROTO_UNDEF; |
| 6435 | else |
| 6436 | bpf_error("illegal qualifier of 'port'"); |
| 6437 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6438 | if (v > 65535) |
| 6439 | bpf_error("illegal port number %u > 65535", v); |
| 6440 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6441 | { |
| 6442 | struct block *b; |
| 6443 | b = gen_port((int)v, proto, dir); |
| 6444 | gen_or(gen_port6((int)v, proto, dir), b); |
| 6445 | return b; |
| 6446 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6447 | |
| 6448 | case Q_PORTRANGE: |
| 6449 | if (proto == Q_UDP) |
| 6450 | proto = IPPROTO_UDP; |
| 6451 | else if (proto == Q_TCP) |
| 6452 | proto = IPPROTO_TCP; |
| 6453 | else if (proto == Q_SCTP) |
| 6454 | proto = IPPROTO_SCTP; |
| 6455 | else if (proto == Q_DEFAULT) |
| 6456 | proto = PROTO_UNDEF; |
| 6457 | else |
| 6458 | bpf_error("illegal qualifier of 'portrange'"); |
| 6459 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6460 | if (v > 65535) |
| 6461 | bpf_error("illegal port number %u > 65535", v); |
| 6462 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6463 | { |
| 6464 | struct block *b; |
| 6465 | b = gen_portrange((int)v, (int)v, proto, dir); |
| 6466 | gen_or(gen_portrange6((int)v, (int)v, proto, dir), b); |
| 6467 | return b; |
| 6468 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6469 | |
| 6470 | case Q_GATEWAY: |
| 6471 | bpf_error("'gateway' requires a name"); |
| 6472 | /* NOTREACHED */ |
| 6473 | |
| 6474 | case Q_PROTO: |
| 6475 | return gen_proto((int)v, proto, dir); |
| 6476 | |
| 6477 | case Q_PROTOCHAIN: |
| 6478 | return gen_protochain((int)v, proto, dir); |
| 6479 | |
| 6480 | case Q_UNDEF: |
| 6481 | syntax(); |
| 6482 | /* NOTREACHED */ |
| 6483 | |
| 6484 | default: |
| 6485 | abort(); |
| 6486 | /* NOTREACHED */ |
| 6487 | } |
| 6488 | /* NOTREACHED */ |
| 6489 | } |
| 6490 | |
| 6491 | #ifdef INET6 |
| 6492 | struct block * |
| 6493 | gen_mcode6(s1, s2, masklen, q) |
| 6494 | register const char *s1, *s2; |
| 6495 | register int masklen; |
| 6496 | struct qual q; |
| 6497 | { |
| 6498 | struct addrinfo *res; |
| 6499 | struct in6_addr *addr; |
| 6500 | struct in6_addr mask; |
| 6501 | struct block *b; |
| 6502 | u_int32_t *a, *m; |
| 6503 | |
| 6504 | if (s2) |
| 6505 | bpf_error("no mask %s supported", s2); |
| 6506 | |
| 6507 | res = pcap_nametoaddrinfo(s1); |
| 6508 | if (!res) |
| 6509 | bpf_error("invalid ip6 address %s", s1); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6510 | ai = res; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6511 | if (res->ai_next) |
| 6512 | bpf_error("%s resolved to multiple address", s1); |
| 6513 | addr = &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr; |
| 6514 | |
| 6515 | if (sizeof(mask) * 8 < masklen) |
| 6516 | bpf_error("mask length must be <= %u", (unsigned int)(sizeof(mask) * 8)); |
| 6517 | memset(&mask, 0, sizeof(mask)); |
| 6518 | memset(&mask, 0xff, masklen / 8); |
| 6519 | if (masklen % 8) { |
| 6520 | mask.s6_addr[masklen / 8] = |
| 6521 | (0xff << (8 - masklen % 8)) & 0xff; |
| 6522 | } |
| 6523 | |
| 6524 | a = (u_int32_t *)addr; |
| 6525 | m = (u_int32_t *)&mask; |
| 6526 | if ((a[0] & ~m[0]) || (a[1] & ~m[1]) |
| 6527 | || (a[2] & ~m[2]) || (a[3] & ~m[3])) { |
| 6528 | bpf_error("non-network bits set in \"%s/%d\"", s1, masklen); |
| 6529 | } |
| 6530 | |
| 6531 | switch (q.addr) { |
| 6532 | |
| 6533 | case Q_DEFAULT: |
| 6534 | case Q_HOST: |
| 6535 | if (masklen != 128) |
| 6536 | bpf_error("Mask syntax for networks only"); |
| 6537 | /* FALLTHROUGH */ |
| 6538 | |
| 6539 | case Q_NET: |
| 6540 | b = gen_host6(addr, &mask, q.proto, q.dir, q.addr); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6541 | ai = NULL; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6542 | freeaddrinfo(res); |
| 6543 | return b; |
| 6544 | |
| 6545 | default: |
| 6546 | bpf_error("invalid qualifier against IPv6 address"); |
| 6547 | /* NOTREACHED */ |
| 6548 | } |
| 6549 | return NULL; |
| 6550 | } |
| 6551 | #endif /*INET6*/ |
| 6552 | |
| 6553 | struct block * |
| 6554 | gen_ecode(eaddr, q) |
| 6555 | register const u_char *eaddr; |
| 6556 | struct qual q; |
| 6557 | { |
| 6558 | struct block *b, *tmp; |
| 6559 | |
| 6560 | if ((q.addr == Q_HOST || q.addr == Q_DEFAULT) && q.proto == Q_LINK) { |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6561 | switch (linktype) { |
| 6562 | case DLT_EN10MB: |
| 6563 | case DLT_NETANALYZER: |
| 6564 | case DLT_NETANALYZER_TRANSPARENT: |
| 6565 | return gen_ehostop(eaddr, (int)q.dir); |
| 6566 | case DLT_FDDI: |
| 6567 | return gen_fhostop(eaddr, (int)q.dir); |
| 6568 | case DLT_IEEE802: |
| 6569 | return gen_thostop(eaddr, (int)q.dir); |
| 6570 | case DLT_IEEE802_11: |
| 6571 | case DLT_PRISM_HEADER: |
| 6572 | case DLT_IEEE802_11_RADIO_AVS: |
| 6573 | case DLT_IEEE802_11_RADIO: |
| 6574 | case DLT_PPI: |
| 6575 | return gen_wlanhostop(eaddr, (int)q.dir); |
| 6576 | case DLT_SUNATM: |
| 6577 | if (is_lane) { |
| 6578 | /* |
| 6579 | * Check that the packet doesn't begin with an |
| 6580 | * LE Control marker. (We've already generated |
| 6581 | * a test for LANE.) |
| 6582 | */ |
| 6583 | tmp = gen_cmp(OR_LINK, SUNATM_PKT_BEGIN_POS, BPF_H, |
| 6584 | 0xFF00); |
| 6585 | gen_not(tmp); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6586 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6587 | /* |
| 6588 | * Now check the MAC address. |
| 6589 | */ |
| 6590 | b = gen_ehostop(eaddr, (int)q.dir); |
| 6591 | gen_and(tmp, b); |
| 6592 | return b; |
| 6593 | } |
| 6594 | break; |
| 6595 | case DLT_IP_OVER_FC: |
| 6596 | return gen_ipfchostop(eaddr, (int)q.dir); |
| 6597 | default: |
| 6598 | bpf_error("ethernet addresses supported only on ethernet/FDDI/token ring/802.11/ATM LANE/Fibre Channel"); |
| 6599 | break; |
| 6600 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6601 | } |
| 6602 | bpf_error("ethernet address used in non-ether expression"); |
| 6603 | /* NOTREACHED */ |
| 6604 | return NULL; |
| 6605 | } |
| 6606 | |
| 6607 | void |
| 6608 | sappend(s0, s1) |
| 6609 | struct slist *s0, *s1; |
| 6610 | { |
| 6611 | /* |
| 6612 | * This is definitely not the best way to do this, but the |
| 6613 | * lists will rarely get long. |
| 6614 | */ |
| 6615 | while (s0->next) |
| 6616 | s0 = s0->next; |
| 6617 | s0->next = s1; |
| 6618 | } |
| 6619 | |
| 6620 | static struct slist * |
| 6621 | xfer_to_x(a) |
| 6622 | struct arth *a; |
| 6623 | { |
| 6624 | struct slist *s; |
| 6625 | |
| 6626 | s = new_stmt(BPF_LDX|BPF_MEM); |
| 6627 | s->s.k = a->regno; |
| 6628 | return s; |
| 6629 | } |
| 6630 | |
| 6631 | static struct slist * |
| 6632 | xfer_to_a(a) |
| 6633 | struct arth *a; |
| 6634 | { |
| 6635 | struct slist *s; |
| 6636 | |
| 6637 | s = new_stmt(BPF_LD|BPF_MEM); |
| 6638 | s->s.k = a->regno; |
| 6639 | return s; |
| 6640 | } |
| 6641 | |
| 6642 | /* |
| 6643 | * Modify "index" to use the value stored into its register as an |
| 6644 | * offset relative to the beginning of the header for the protocol |
| 6645 | * "proto", and allocate a register and put an item "size" bytes long |
| 6646 | * (1, 2, or 4) at that offset into that register, making it the register |
| 6647 | * for "index". |
| 6648 | */ |
| 6649 | struct arth * |
| 6650 | gen_load(proto, inst, size) |
| 6651 | int proto; |
| 6652 | struct arth *inst; |
| 6653 | int size; |
| 6654 | { |
| 6655 | struct slist *s, *tmp; |
| 6656 | struct block *b; |
| 6657 | int regno = alloc_reg(); |
| 6658 | |
| 6659 | free_reg(inst->regno); |
| 6660 | switch (size) { |
| 6661 | |
| 6662 | default: |
| 6663 | bpf_error("data size must be 1, 2, or 4"); |
| 6664 | |
| 6665 | case 1: |
| 6666 | size = BPF_B; |
| 6667 | break; |
| 6668 | |
| 6669 | case 2: |
| 6670 | size = BPF_H; |
| 6671 | break; |
| 6672 | |
| 6673 | case 4: |
| 6674 | size = BPF_W; |
| 6675 | break; |
| 6676 | } |
| 6677 | switch (proto) { |
| 6678 | default: |
| 6679 | bpf_error("unsupported index operation"); |
| 6680 | |
| 6681 | case Q_RADIO: |
| 6682 | /* |
| 6683 | * The offset is relative to the beginning of the packet |
| 6684 | * data, if we have a radio header. (If we don't, this |
| 6685 | * is an error.) |
| 6686 | */ |
| 6687 | if (linktype != DLT_IEEE802_11_RADIO_AVS && |
| 6688 | linktype != DLT_IEEE802_11_RADIO && |
| 6689 | linktype != DLT_PRISM_HEADER) |
| 6690 | bpf_error("radio information not present in capture"); |
| 6691 | |
| 6692 | /* |
| 6693 | * Load into the X register the offset computed into the |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6694 | * register specified by "index". |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6695 | */ |
| 6696 | s = xfer_to_x(inst); |
| 6697 | |
| 6698 | /* |
| 6699 | * Load the item at that offset. |
| 6700 | */ |
| 6701 | tmp = new_stmt(BPF_LD|BPF_IND|size); |
| 6702 | sappend(s, tmp); |
| 6703 | sappend(inst->s, s); |
| 6704 | break; |
| 6705 | |
| 6706 | case Q_LINK: |
| 6707 | /* |
| 6708 | * The offset is relative to the beginning of |
| 6709 | * the link-layer header. |
| 6710 | * |
| 6711 | * XXX - what about ATM LANE? Should the index be |
| 6712 | * relative to the beginning of the AAL5 frame, so |
| 6713 | * that 0 refers to the beginning of the LE Control |
| 6714 | * field, or relative to the beginning of the LAN |
| 6715 | * frame, so that 0 refers, for Ethernet LANE, to |
| 6716 | * the beginning of the destination address? |
| 6717 | */ |
| 6718 | s = gen_llprefixlen(); |
| 6719 | |
| 6720 | /* |
| 6721 | * If "s" is non-null, it has code to arrange that the |
| 6722 | * X register contains the length of the prefix preceding |
| 6723 | * the link-layer header. Add to it the offset computed |
| 6724 | * into the register specified by "index", and move that |
| 6725 | * into the X register. Otherwise, just load into the X |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6726 | * register the offset computed into the register specified |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6727 | * by "index". |
| 6728 | */ |
| 6729 | if (s != NULL) { |
| 6730 | sappend(s, xfer_to_a(inst)); |
| 6731 | sappend(s, new_stmt(BPF_ALU|BPF_ADD|BPF_X)); |
| 6732 | sappend(s, new_stmt(BPF_MISC|BPF_TAX)); |
| 6733 | } else |
| 6734 | s = xfer_to_x(inst); |
| 6735 | |
| 6736 | /* |
| 6737 | * Load the item at the sum of the offset we've put in the |
| 6738 | * X register and the offset of the start of the link |
| 6739 | * layer header (which is 0 if the radio header is |
| 6740 | * variable-length; that header length is what we put |
| 6741 | * into the X register and then added to the index). |
| 6742 | */ |
| 6743 | tmp = new_stmt(BPF_LD|BPF_IND|size); |
| 6744 | tmp->s.k = off_ll; |
| 6745 | sappend(s, tmp); |
| 6746 | sappend(inst->s, s); |
| 6747 | break; |
| 6748 | |
| 6749 | case Q_IP: |
| 6750 | case Q_ARP: |
| 6751 | case Q_RARP: |
| 6752 | case Q_ATALK: |
| 6753 | case Q_DECNET: |
| 6754 | case Q_SCA: |
| 6755 | case Q_LAT: |
| 6756 | case Q_MOPRC: |
| 6757 | case Q_MOPDL: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6758 | case Q_IPV6: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6759 | /* |
| 6760 | * The offset is relative to the beginning of |
| 6761 | * the network-layer header. |
| 6762 | * XXX - are there any cases where we want |
| 6763 | * off_nl_nosnap? |
| 6764 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6765 | s = gen_off_macpl(); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6766 | |
| 6767 | /* |
| 6768 | * If "s" is non-null, it has code to arrange that the |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6769 | * X register contains the offset of the MAC-layer |
| 6770 | * payload. Add to it the offset computed into the |
| 6771 | * register specified by "index", and move that into |
| 6772 | * the X register. Otherwise, just load into the X |
| 6773 | * register the offset computed into the register specified |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6774 | * by "index". |
| 6775 | */ |
| 6776 | if (s != NULL) { |
| 6777 | sappend(s, xfer_to_a(inst)); |
| 6778 | sappend(s, new_stmt(BPF_ALU|BPF_ADD|BPF_X)); |
| 6779 | sappend(s, new_stmt(BPF_MISC|BPF_TAX)); |
| 6780 | } else |
| 6781 | s = xfer_to_x(inst); |
| 6782 | |
| 6783 | /* |
| 6784 | * Load the item at the sum of the offset we've put in the |
| 6785 | * X register, the offset of the start of the network |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6786 | * layer header from the beginning of the MAC-layer |
| 6787 | * payload, and the purported offset of the start of the |
| 6788 | * MAC-layer payload (which might be 0 if there's a |
| 6789 | * variable-length prefix before the link-layer header |
| 6790 | * or the link-layer header itself is variable-length; |
| 6791 | * the variable-length offset of the start of the |
| 6792 | * MAC-layer payload is what we put into the X register |
| 6793 | * and then added to the index). |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6794 | */ |
| 6795 | tmp = new_stmt(BPF_LD|BPF_IND|size); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6796 | tmp->s.k = off_macpl + off_nl; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6797 | sappend(s, tmp); |
| 6798 | sappend(inst->s, s); |
| 6799 | |
| 6800 | /* |
| 6801 | * Do the computation only if the packet contains |
| 6802 | * the protocol in question. |
| 6803 | */ |
| 6804 | b = gen_proto_abbrev(proto); |
| 6805 | if (inst->b) |
| 6806 | gen_and(inst->b, b); |
| 6807 | inst->b = b; |
| 6808 | break; |
| 6809 | |
| 6810 | case Q_SCTP: |
| 6811 | case Q_TCP: |
| 6812 | case Q_UDP: |
| 6813 | case Q_ICMP: |
| 6814 | case Q_IGMP: |
| 6815 | case Q_IGRP: |
| 6816 | case Q_PIM: |
| 6817 | case Q_VRRP: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6818 | case Q_CARP: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6819 | /* |
| 6820 | * The offset is relative to the beginning of |
| 6821 | * the transport-layer header. |
| 6822 | * |
| 6823 | * Load the X register with the length of the IPv4 header |
| 6824 | * (plus the offset of the link-layer header, if it's |
| 6825 | * a variable-length header), in bytes. |
| 6826 | * |
| 6827 | * XXX - are there any cases where we want |
| 6828 | * off_nl_nosnap? |
| 6829 | * XXX - we should, if we're built with |
| 6830 | * IPv6 support, generate code to load either |
| 6831 | * IPv4, IPv6, or both, as appropriate. |
| 6832 | */ |
| 6833 | s = gen_loadx_iphdrlen(); |
| 6834 | |
| 6835 | /* |
| 6836 | * The X register now contains the sum of the length |
| 6837 | * of any variable-length header preceding the link-layer |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6838 | * header, any variable-length link-layer header, and the |
| 6839 | * length of the network-layer header. |
| 6840 | * |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6841 | * Load into the A register the offset relative to |
| 6842 | * the beginning of the transport layer header, |
| 6843 | * add the X register to that, move that to the |
| 6844 | * X register, and load with an offset from the |
| 6845 | * X register equal to the offset of the network |
| 6846 | * layer header relative to the beginning of |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6847 | * the MAC-layer payload plus the fixed-length |
| 6848 | * portion of the offset of the MAC-layer payload |
| 6849 | * from the beginning of the raw packet data. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6850 | */ |
| 6851 | sappend(s, xfer_to_a(inst)); |
| 6852 | sappend(s, new_stmt(BPF_ALU|BPF_ADD|BPF_X)); |
| 6853 | sappend(s, new_stmt(BPF_MISC|BPF_TAX)); |
| 6854 | sappend(s, tmp = new_stmt(BPF_LD|BPF_IND|size)); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 6855 | tmp->s.k = off_macpl + off_nl; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6856 | sappend(inst->s, s); |
| 6857 | |
| 6858 | /* |
| 6859 | * Do the computation only if the packet contains |
| 6860 | * the protocol in question - which is true only |
| 6861 | * if this is an IP datagram and is the first or |
| 6862 | * only fragment of that datagram. |
| 6863 | */ |
| 6864 | gen_and(gen_proto_abbrev(proto), b = gen_ipfrag()); |
| 6865 | if (inst->b) |
| 6866 | gen_and(inst->b, b); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6867 | gen_and(gen_proto_abbrev(Q_IP), b); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6868 | inst->b = b; |
| 6869 | break; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6870 | case Q_ICMPV6: |
| 6871 | bpf_error("IPv6 upper-layer protocol is not supported by proto[x]"); |
| 6872 | /*NOTREACHED*/ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6873 | } |
| 6874 | inst->regno = regno; |
| 6875 | s = new_stmt(BPF_ST); |
| 6876 | s->s.k = regno; |
| 6877 | sappend(inst->s, s); |
| 6878 | |
| 6879 | return inst; |
| 6880 | } |
| 6881 | |
| 6882 | struct block * |
| 6883 | gen_relation(code, a0, a1, reversed) |
| 6884 | int code; |
| 6885 | struct arth *a0, *a1; |
| 6886 | int reversed; |
| 6887 | { |
| 6888 | struct slist *s0, *s1, *s2; |
| 6889 | struct block *b, *tmp; |
| 6890 | |
| 6891 | s0 = xfer_to_x(a1); |
| 6892 | s1 = xfer_to_a(a0); |
| 6893 | if (code == BPF_JEQ) { |
| 6894 | s2 = new_stmt(BPF_ALU|BPF_SUB|BPF_X); |
| 6895 | b = new_block(JMP(code)); |
| 6896 | sappend(s1, s2); |
| 6897 | } |
| 6898 | else |
| 6899 | b = new_block(BPF_JMP|code|BPF_X); |
| 6900 | if (reversed) |
| 6901 | gen_not(b); |
| 6902 | |
| 6903 | sappend(s0, s1); |
| 6904 | sappend(a1->s, s0); |
| 6905 | sappend(a0->s, a1->s); |
| 6906 | |
| 6907 | b->stmts = a0->s; |
| 6908 | |
| 6909 | free_reg(a0->regno); |
| 6910 | free_reg(a1->regno); |
| 6911 | |
| 6912 | /* 'and' together protocol checks */ |
| 6913 | if (a0->b) { |
| 6914 | if (a1->b) { |
| 6915 | gen_and(a0->b, tmp = a1->b); |
| 6916 | } |
| 6917 | else |
| 6918 | tmp = a0->b; |
| 6919 | } else |
| 6920 | tmp = a1->b; |
| 6921 | |
| 6922 | if (tmp) |
| 6923 | gen_and(tmp, b); |
| 6924 | |
| 6925 | return b; |
| 6926 | } |
| 6927 | |
| 6928 | struct arth * |
| 6929 | gen_loadlen() |
| 6930 | { |
| 6931 | int regno = alloc_reg(); |
| 6932 | struct arth *a = (struct arth *)newchunk(sizeof(*a)); |
| 6933 | struct slist *s; |
| 6934 | |
| 6935 | s = new_stmt(BPF_LD|BPF_LEN); |
| 6936 | s->next = new_stmt(BPF_ST); |
| 6937 | s->next->s.k = regno; |
| 6938 | a->s = s; |
| 6939 | a->regno = regno; |
| 6940 | |
| 6941 | return a; |
| 6942 | } |
| 6943 | |
| 6944 | struct arth * |
| 6945 | gen_loadi(val) |
| 6946 | int val; |
| 6947 | { |
| 6948 | struct arth *a; |
| 6949 | struct slist *s; |
| 6950 | int reg; |
| 6951 | |
| 6952 | a = (struct arth *)newchunk(sizeof(*a)); |
| 6953 | |
| 6954 | reg = alloc_reg(); |
| 6955 | |
| 6956 | s = new_stmt(BPF_LD|BPF_IMM); |
| 6957 | s->s.k = val; |
| 6958 | s->next = new_stmt(BPF_ST); |
| 6959 | s->next->s.k = reg; |
| 6960 | a->s = s; |
| 6961 | a->regno = reg; |
| 6962 | |
| 6963 | return a; |
| 6964 | } |
| 6965 | |
| 6966 | struct arth * |
| 6967 | gen_neg(a) |
| 6968 | struct arth *a; |
| 6969 | { |
| 6970 | struct slist *s; |
| 6971 | |
| 6972 | s = xfer_to_a(a); |
| 6973 | sappend(a->s, s); |
| 6974 | s = new_stmt(BPF_ALU|BPF_NEG); |
| 6975 | s->s.k = 0; |
| 6976 | sappend(a->s, s); |
| 6977 | s = new_stmt(BPF_ST); |
| 6978 | s->s.k = a->regno; |
| 6979 | sappend(a->s, s); |
| 6980 | |
| 6981 | return a; |
| 6982 | } |
| 6983 | |
| 6984 | struct arth * |
| 6985 | gen_arth(code, a0, a1) |
| 6986 | int code; |
| 6987 | struct arth *a0, *a1; |
| 6988 | { |
| 6989 | struct slist *s0, *s1, *s2; |
| 6990 | |
| 6991 | s0 = xfer_to_x(a1); |
| 6992 | s1 = xfer_to_a(a0); |
| 6993 | s2 = new_stmt(BPF_ALU|BPF_X|code); |
| 6994 | |
| 6995 | sappend(s1, s2); |
| 6996 | sappend(s0, s1); |
| 6997 | sappend(a1->s, s0); |
| 6998 | sappend(a0->s, a1->s); |
| 6999 | |
| 7000 | free_reg(a0->regno); |
| 7001 | free_reg(a1->regno); |
| 7002 | |
| 7003 | s0 = new_stmt(BPF_ST); |
| 7004 | a0->regno = s0->s.k = alloc_reg(); |
| 7005 | sappend(a0->s, s0); |
| 7006 | |
| 7007 | return a0; |
| 7008 | } |
| 7009 | |
| 7010 | /* |
| 7011 | * Here we handle simple allocation of the scratch registers. |
| 7012 | * If too many registers are alloc'd, the allocator punts. |
| 7013 | */ |
| 7014 | static int regused[BPF_MEMWORDS]; |
| 7015 | static int curreg; |
| 7016 | |
| 7017 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7018 | * Initialize the table of used registers and the current register. |
| 7019 | */ |
| 7020 | static void |
| 7021 | init_regs() |
| 7022 | { |
| 7023 | curreg = 0; |
| 7024 | memset(regused, 0, sizeof regused); |
| 7025 | } |
| 7026 | |
| 7027 | /* |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7028 | * Return the next free register. |
| 7029 | */ |
| 7030 | static int |
| 7031 | alloc_reg() |
| 7032 | { |
| 7033 | int n = BPF_MEMWORDS; |
| 7034 | |
| 7035 | while (--n >= 0) { |
| 7036 | if (regused[curreg]) |
| 7037 | curreg = (curreg + 1) % BPF_MEMWORDS; |
| 7038 | else { |
| 7039 | regused[curreg] = 1; |
| 7040 | return curreg; |
| 7041 | } |
| 7042 | } |
| 7043 | bpf_error("too many registers needed to evaluate expression"); |
| 7044 | /* NOTREACHED */ |
| 7045 | return 0; |
| 7046 | } |
| 7047 | |
| 7048 | /* |
| 7049 | * Return a register to the table so it can |
| 7050 | * be used later. |
| 7051 | */ |
| 7052 | static void |
| 7053 | free_reg(n) |
| 7054 | int n; |
| 7055 | { |
| 7056 | regused[n] = 0; |
| 7057 | } |
| 7058 | |
| 7059 | static struct block * |
| 7060 | gen_len(jmp, n) |
| 7061 | int jmp, n; |
| 7062 | { |
| 7063 | struct slist *s; |
| 7064 | struct block *b; |
| 7065 | |
| 7066 | s = new_stmt(BPF_LD|BPF_LEN); |
| 7067 | b = new_block(JMP(jmp)); |
| 7068 | b->stmts = s; |
| 7069 | b->s.k = n; |
| 7070 | |
| 7071 | return b; |
| 7072 | } |
| 7073 | |
| 7074 | struct block * |
| 7075 | gen_greater(n) |
| 7076 | int n; |
| 7077 | { |
| 7078 | return gen_len(BPF_JGE, n); |
| 7079 | } |
| 7080 | |
| 7081 | /* |
| 7082 | * Actually, this is less than or equal. |
| 7083 | */ |
| 7084 | struct block * |
| 7085 | gen_less(n) |
| 7086 | int n; |
| 7087 | { |
| 7088 | struct block *b; |
| 7089 | |
| 7090 | b = gen_len(BPF_JGT, n); |
| 7091 | gen_not(b); |
| 7092 | |
| 7093 | return b; |
| 7094 | } |
| 7095 | |
| 7096 | /* |
| 7097 | * This is for "byte {idx} {op} {val}"; "idx" is treated as relative to |
| 7098 | * the beginning of the link-layer header. |
| 7099 | * XXX - that means you can't test values in the radiotap header, but |
| 7100 | * as that header is difficult if not impossible to parse generally |
| 7101 | * without a loop, that might not be a severe problem. A new keyword |
| 7102 | * "radio" could be added for that, although what you'd really want |
| 7103 | * would be a way of testing particular radio header values, which |
| 7104 | * would generate code appropriate to the radio header in question. |
| 7105 | */ |
| 7106 | struct block * |
| 7107 | gen_byteop(op, idx, val) |
| 7108 | int op, idx, val; |
| 7109 | { |
| 7110 | struct block *b; |
| 7111 | struct slist *s; |
| 7112 | |
| 7113 | switch (op) { |
| 7114 | default: |
| 7115 | abort(); |
| 7116 | |
| 7117 | case '=': |
| 7118 | return gen_cmp(OR_LINK, (u_int)idx, BPF_B, (bpf_int32)val); |
| 7119 | |
| 7120 | case '<': |
| 7121 | b = gen_cmp_lt(OR_LINK, (u_int)idx, BPF_B, (bpf_int32)val); |
| 7122 | return b; |
| 7123 | |
| 7124 | case '>': |
| 7125 | b = gen_cmp_gt(OR_LINK, (u_int)idx, BPF_B, (bpf_int32)val); |
| 7126 | return b; |
| 7127 | |
| 7128 | case '|': |
| 7129 | s = new_stmt(BPF_ALU|BPF_OR|BPF_K); |
| 7130 | break; |
| 7131 | |
| 7132 | case '&': |
| 7133 | s = new_stmt(BPF_ALU|BPF_AND|BPF_K); |
| 7134 | break; |
| 7135 | } |
| 7136 | s->s.k = val; |
| 7137 | b = new_block(JMP(BPF_JEQ)); |
| 7138 | b->stmts = s; |
| 7139 | gen_not(b); |
| 7140 | |
| 7141 | return b; |
| 7142 | } |
| 7143 | |
| 7144 | static u_char abroadcast[] = { 0x0 }; |
| 7145 | |
| 7146 | struct block * |
| 7147 | gen_broadcast(proto) |
| 7148 | int proto; |
| 7149 | { |
| 7150 | bpf_u_int32 hostmask; |
| 7151 | struct block *b0, *b1, *b2; |
| 7152 | static u_char ebroadcast[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
| 7153 | |
| 7154 | switch (proto) { |
| 7155 | |
| 7156 | case Q_DEFAULT: |
| 7157 | case Q_LINK: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7158 | switch (linktype) { |
| 7159 | case DLT_ARCNET: |
| 7160 | case DLT_ARCNET_LINUX: |
| 7161 | return gen_ahostop(abroadcast, Q_DST); |
| 7162 | case DLT_EN10MB: |
| 7163 | case DLT_NETANALYZER: |
| 7164 | case DLT_NETANALYZER_TRANSPARENT: |
| 7165 | return gen_ehostop(ebroadcast, Q_DST); |
| 7166 | case DLT_FDDI: |
| 7167 | return gen_fhostop(ebroadcast, Q_DST); |
| 7168 | case DLT_IEEE802: |
| 7169 | return gen_thostop(ebroadcast, Q_DST); |
| 7170 | case DLT_IEEE802_11: |
| 7171 | case DLT_PRISM_HEADER: |
| 7172 | case DLT_IEEE802_11_RADIO_AVS: |
| 7173 | case DLT_IEEE802_11_RADIO: |
| 7174 | case DLT_PPI: |
| 7175 | return gen_wlanhostop(ebroadcast, Q_DST); |
| 7176 | case DLT_IP_OVER_FC: |
| 7177 | return gen_ipfchostop(ebroadcast, Q_DST); |
| 7178 | case DLT_SUNATM: |
| 7179 | if (is_lane) { |
| 7180 | /* |
| 7181 | * Check that the packet doesn't begin with an |
| 7182 | * LE Control marker. (We've already generated |
| 7183 | * a test for LANE.) |
| 7184 | */ |
| 7185 | b1 = gen_cmp(OR_LINK, SUNATM_PKT_BEGIN_POS, |
| 7186 | BPF_H, 0xFF00); |
| 7187 | gen_not(b1); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7188 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7189 | /* |
| 7190 | * Now check the MAC address. |
| 7191 | */ |
| 7192 | b0 = gen_ehostop(ebroadcast, Q_DST); |
| 7193 | gen_and(b1, b0); |
| 7194 | return b0; |
| 7195 | } |
| 7196 | break; |
| 7197 | default: |
| 7198 | bpf_error("not a broadcast link"); |
| 7199 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7200 | break; |
| 7201 | |
| 7202 | case Q_IP: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7203 | /* |
| 7204 | * We treat a netmask of PCAP_NETMASK_UNKNOWN (0xffffffff) |
| 7205 | * as an indication that we don't know the netmask, and fail |
| 7206 | * in that case. |
| 7207 | */ |
| 7208 | if (netmask == PCAP_NETMASK_UNKNOWN) |
| 7209 | bpf_error("netmask not known, so 'ip broadcast' not supported"); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7210 | b0 = gen_linktype(ETHERTYPE_IP); |
| 7211 | hostmask = ~netmask; |
| 7212 | b1 = gen_mcmp(OR_NET, 16, BPF_W, (bpf_int32)0, hostmask); |
| 7213 | b2 = gen_mcmp(OR_NET, 16, BPF_W, |
| 7214 | (bpf_int32)(~0 & hostmask), hostmask); |
| 7215 | gen_or(b1, b2); |
| 7216 | gen_and(b0, b2); |
| 7217 | return b2; |
| 7218 | } |
| 7219 | bpf_error("only link-layer/IP broadcast filters supported"); |
| 7220 | /* NOTREACHED */ |
| 7221 | return NULL; |
| 7222 | } |
| 7223 | |
| 7224 | /* |
| 7225 | * Generate code to test the low-order bit of a MAC address (that's |
| 7226 | * the bottom bit of the *first* byte). |
| 7227 | */ |
| 7228 | static struct block * |
| 7229 | gen_mac_multicast(offset) |
| 7230 | int offset; |
| 7231 | { |
| 7232 | register struct block *b0; |
| 7233 | register struct slist *s; |
| 7234 | |
| 7235 | /* link[offset] & 1 != 0 */ |
| 7236 | s = gen_load_a(OR_LINK, offset, BPF_B); |
| 7237 | b0 = new_block(JMP(BPF_JSET)); |
| 7238 | b0->s.k = 1; |
| 7239 | b0->stmts = s; |
| 7240 | return b0; |
| 7241 | } |
| 7242 | |
| 7243 | struct block * |
| 7244 | gen_multicast(proto) |
| 7245 | int proto; |
| 7246 | { |
| 7247 | register struct block *b0, *b1, *b2; |
| 7248 | register struct slist *s; |
| 7249 | |
| 7250 | switch (proto) { |
| 7251 | |
| 7252 | case Q_DEFAULT: |
| 7253 | case Q_LINK: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7254 | switch (linktype) { |
| 7255 | case DLT_ARCNET: |
| 7256 | case DLT_ARCNET_LINUX: |
| 7257 | /* all ARCnet multicasts use the same address */ |
| 7258 | return gen_ahostop(abroadcast, Q_DST); |
| 7259 | case DLT_EN10MB: |
| 7260 | case DLT_NETANALYZER: |
| 7261 | case DLT_NETANALYZER_TRANSPARENT: |
| 7262 | /* ether[0] & 1 != 0 */ |
| 7263 | return gen_mac_multicast(0); |
| 7264 | case DLT_FDDI: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7265 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7266 | * XXX TEST THIS: MIGHT NOT PORT PROPERLY XXX |
| 7267 | * |
| 7268 | * XXX - was that referring to bit-order issues? |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7269 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7270 | /* fddi[1] & 1 != 0 */ |
| 7271 | return gen_mac_multicast(1); |
| 7272 | case DLT_IEEE802: |
| 7273 | /* tr[2] & 1 != 0 */ |
| 7274 | return gen_mac_multicast(2); |
| 7275 | case DLT_IEEE802_11: |
| 7276 | case DLT_PRISM_HEADER: |
| 7277 | case DLT_IEEE802_11_RADIO_AVS: |
| 7278 | case DLT_IEEE802_11_RADIO: |
| 7279 | case DLT_PPI: |
| 7280 | /* |
| 7281 | * Oh, yuk. |
| 7282 | * |
| 7283 | * For control frames, there is no DA. |
| 7284 | * |
| 7285 | * For management frames, DA is at an |
| 7286 | * offset of 4 from the beginning of |
| 7287 | * the packet. |
| 7288 | * |
| 7289 | * For data frames, DA is at an offset |
| 7290 | * of 4 from the beginning of the packet |
| 7291 | * if To DS is clear and at an offset of |
| 7292 | * 16 from the beginning of the packet |
| 7293 | * if To DS is set. |
| 7294 | */ |
| 7295 | |
| 7296 | /* |
| 7297 | * Generate the tests to be done for data frames. |
| 7298 | * |
| 7299 | * First, check for To DS set, i.e. "link[1] & 0x01". |
| 7300 | */ |
| 7301 | s = gen_load_a(OR_LINK, 1, BPF_B); |
| 7302 | b1 = new_block(JMP(BPF_JSET)); |
| 7303 | b1->s.k = 0x01; /* To DS */ |
| 7304 | b1->stmts = s; |
| 7305 | |
| 7306 | /* |
| 7307 | * If To DS is set, the DA is at 16. |
| 7308 | */ |
| 7309 | b0 = gen_mac_multicast(16); |
| 7310 | gen_and(b1, b0); |
| 7311 | |
| 7312 | /* |
| 7313 | * Now, check for To DS not set, i.e. check |
| 7314 | * "!(link[1] & 0x01)". |
| 7315 | */ |
| 7316 | s = gen_load_a(OR_LINK, 1, BPF_B); |
| 7317 | b2 = new_block(JMP(BPF_JSET)); |
| 7318 | b2->s.k = 0x01; /* To DS */ |
| 7319 | b2->stmts = s; |
| 7320 | gen_not(b2); |
| 7321 | |
| 7322 | /* |
| 7323 | * If To DS is not set, the DA is at 4. |
| 7324 | */ |
| 7325 | b1 = gen_mac_multicast(4); |
| 7326 | gen_and(b2, b1); |
| 7327 | |
| 7328 | /* |
| 7329 | * Now OR together the last two checks. That gives |
| 7330 | * the complete set of checks for data frames. |
| 7331 | */ |
| 7332 | gen_or(b1, b0); |
| 7333 | |
| 7334 | /* |
| 7335 | * Now check for a data frame. |
| 7336 | * I.e, check "link[0] & 0x08". |
| 7337 | */ |
| 7338 | s = gen_load_a(OR_LINK, 0, BPF_B); |
| 7339 | b1 = new_block(JMP(BPF_JSET)); |
| 7340 | b1->s.k = 0x08; |
| 7341 | b1->stmts = s; |
| 7342 | |
| 7343 | /* |
| 7344 | * AND that with the checks done for data frames. |
| 7345 | */ |
| 7346 | gen_and(b1, b0); |
| 7347 | |
| 7348 | /* |
| 7349 | * If the high-order bit of the type value is 0, this |
| 7350 | * is a management frame. |
| 7351 | * I.e, check "!(link[0] & 0x08)". |
| 7352 | */ |
| 7353 | s = gen_load_a(OR_LINK, 0, BPF_B); |
| 7354 | b2 = new_block(JMP(BPF_JSET)); |
| 7355 | b2->s.k = 0x08; |
| 7356 | b2->stmts = s; |
| 7357 | gen_not(b2); |
| 7358 | |
| 7359 | /* |
| 7360 | * For management frames, the DA is at 4. |
| 7361 | */ |
| 7362 | b1 = gen_mac_multicast(4); |
| 7363 | gen_and(b2, b1); |
| 7364 | |
| 7365 | /* |
| 7366 | * OR that with the checks done for data frames. |
| 7367 | * That gives the checks done for management and |
| 7368 | * data frames. |
| 7369 | */ |
| 7370 | gen_or(b1, b0); |
| 7371 | |
| 7372 | /* |
| 7373 | * If the low-order bit of the type value is 1, |
| 7374 | * this is either a control frame or a frame |
| 7375 | * with a reserved type, and thus not a |
| 7376 | * frame with an SA. |
| 7377 | * |
| 7378 | * I.e., check "!(link[0] & 0x04)". |
| 7379 | */ |
| 7380 | s = gen_load_a(OR_LINK, 0, BPF_B); |
| 7381 | b1 = new_block(JMP(BPF_JSET)); |
| 7382 | b1->s.k = 0x04; |
| 7383 | b1->stmts = s; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7384 | gen_not(b1); |
| 7385 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7386 | /* |
| 7387 | * AND that with the checks for data and management |
| 7388 | * frames. |
| 7389 | */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7390 | gen_and(b1, b0); |
| 7391 | return b0; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7392 | case DLT_IP_OVER_FC: |
| 7393 | b0 = gen_mac_multicast(2); |
| 7394 | return b0; |
| 7395 | case DLT_SUNATM: |
| 7396 | if (is_lane) { |
| 7397 | /* |
| 7398 | * Check that the packet doesn't begin with an |
| 7399 | * LE Control marker. (We've already generated |
| 7400 | * a test for LANE.) |
| 7401 | */ |
| 7402 | b1 = gen_cmp(OR_LINK, SUNATM_PKT_BEGIN_POS, |
| 7403 | BPF_H, 0xFF00); |
| 7404 | gen_not(b1); |
| 7405 | |
| 7406 | /* ether[off_mac] & 1 != 0 */ |
| 7407 | b0 = gen_mac_multicast(off_mac); |
| 7408 | gen_and(b1, b0); |
| 7409 | return b0; |
| 7410 | } |
| 7411 | break; |
| 7412 | default: |
| 7413 | break; |
| 7414 | } |
| 7415 | /* Link not known to support multicasts */ |
| 7416 | break; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7417 | |
| 7418 | case Q_IP: |
| 7419 | b0 = gen_linktype(ETHERTYPE_IP); |
| 7420 | b1 = gen_cmp_ge(OR_NET, 16, BPF_B, (bpf_int32)224); |
| 7421 | gen_and(b0, b1); |
| 7422 | return b1; |
| 7423 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7424 | case Q_IPV6: |
| 7425 | b0 = gen_linktype(ETHERTYPE_IPV6); |
| 7426 | b1 = gen_cmp(OR_NET, 24, BPF_B, (bpf_int32)255); |
| 7427 | gen_and(b0, b1); |
| 7428 | return b1; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7429 | } |
| 7430 | bpf_error("link-layer multicast filters supported only on ethernet/FDDI/token ring/ARCNET/802.11/ATM LANE/Fibre Channel"); |
| 7431 | /* NOTREACHED */ |
| 7432 | return NULL; |
| 7433 | } |
| 7434 | |
| 7435 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7436 | * Filter on inbound (dir == 0) or outbound (dir == 1) traffic. |
| 7437 | * Outbound traffic is sent by this machine, while inbound traffic is |
| 7438 | * sent by a remote machine (and may include packets destined for a |
| 7439 | * unicast or multicast link-layer address we are not subscribing to). |
| 7440 | * These are the same definitions implemented by pcap_setdirection(). |
| 7441 | * Capturing only unicast traffic destined for this host is probably |
| 7442 | * better accomplished using a higher-layer filter. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7443 | */ |
| 7444 | struct block * |
| 7445 | gen_inbound(dir) |
| 7446 | int dir; |
| 7447 | { |
| 7448 | register struct block *b0; |
| 7449 | |
| 7450 | /* |
| 7451 | * Only some data link types support inbound/outbound qualifiers. |
| 7452 | */ |
| 7453 | switch (linktype) { |
| 7454 | case DLT_SLIP: |
| 7455 | b0 = gen_relation(BPF_JEQ, |
| 7456 | gen_load(Q_LINK, gen_loadi(0), 1), |
| 7457 | gen_loadi(0), |
| 7458 | dir); |
| 7459 | break; |
| 7460 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7461 | case DLT_IPNET: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7462 | if (dir) { |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7463 | /* match outgoing packets */ |
| 7464 | b0 = gen_cmp(OR_LINK, 2, BPF_H, IPNET_OUTBOUND); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7465 | } else { |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7466 | /* match incoming packets */ |
| 7467 | b0 = gen_cmp(OR_LINK, 2, BPF_H, IPNET_INBOUND); |
| 7468 | } |
| 7469 | break; |
| 7470 | |
| 7471 | case DLT_LINUX_SLL: |
| 7472 | /* match outgoing packets */ |
| 7473 | b0 = gen_cmp(OR_LINK, 0, BPF_H, LINUX_SLL_OUTGOING); |
| 7474 | if (!dir) { |
| 7475 | /* to filter on inbound traffic, invert the match */ |
| 7476 | gen_not(b0); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7477 | } |
| 7478 | break; |
| 7479 | |
| 7480 | #ifdef HAVE_NET_PFVAR_H |
| 7481 | case DLT_PFLOG: |
| 7482 | b0 = gen_cmp(OR_LINK, offsetof(struct pfloghdr, dir), BPF_B, |
| 7483 | (bpf_int32)((dir == 0) ? PF_IN : PF_OUT)); |
| 7484 | break; |
| 7485 | #endif |
| 7486 | |
| 7487 | case DLT_PPP_PPPD: |
| 7488 | if (dir) { |
| 7489 | /* match outgoing packets */ |
| 7490 | b0 = gen_cmp(OR_LINK, 0, BPF_B, PPP_PPPD_OUT); |
| 7491 | } else { |
| 7492 | /* match incoming packets */ |
| 7493 | b0 = gen_cmp(OR_LINK, 0, BPF_B, PPP_PPPD_IN); |
| 7494 | } |
| 7495 | break; |
| 7496 | |
| 7497 | case DLT_JUNIPER_MFR: |
| 7498 | case DLT_JUNIPER_MLFR: |
| 7499 | case DLT_JUNIPER_MLPPP: |
| 7500 | case DLT_JUNIPER_ATM1: |
| 7501 | case DLT_JUNIPER_ATM2: |
| 7502 | case DLT_JUNIPER_PPPOE: |
| 7503 | case DLT_JUNIPER_PPPOE_ATM: |
| 7504 | case DLT_JUNIPER_GGSN: |
| 7505 | case DLT_JUNIPER_ES: |
| 7506 | case DLT_JUNIPER_MONITOR: |
| 7507 | case DLT_JUNIPER_SERVICES: |
| 7508 | case DLT_JUNIPER_ETHER: |
| 7509 | case DLT_JUNIPER_PPP: |
| 7510 | case DLT_JUNIPER_FRELAY: |
| 7511 | case DLT_JUNIPER_CHDLC: |
| 7512 | case DLT_JUNIPER_VP: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7513 | case DLT_JUNIPER_ST: |
| 7514 | case DLT_JUNIPER_ISM: |
| 7515 | case DLT_JUNIPER_VS: |
| 7516 | case DLT_JUNIPER_SRX_E2E: |
| 7517 | case DLT_JUNIPER_FIBRECHANNEL: |
| 7518 | case DLT_JUNIPER_ATM_CEMIC: |
| 7519 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7520 | /* juniper flags (including direction) are stored |
| 7521 | * the byte after the 3-byte magic number */ |
| 7522 | if (dir) { |
| 7523 | /* match outgoing packets */ |
| 7524 | b0 = gen_mcmp(OR_LINK, 3, BPF_B, 0, 0x01); |
| 7525 | } else { |
| 7526 | /* match incoming packets */ |
| 7527 | b0 = gen_mcmp(OR_LINK, 3, BPF_B, 1, 0x01); |
| 7528 | } |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7529 | break; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7530 | |
| 7531 | default: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7532 | /* |
| 7533 | * If we have packet meta-data indicating a direction, |
| 7534 | * check it, otherwise give up as this link-layer type |
| 7535 | * has nothing in the packet data. |
| 7536 | */ |
| 7537 | #if defined(linux) && defined(PF_PACKET) && defined(SO_ATTACH_FILTER) |
| 7538 | /* |
| 7539 | * This is Linux with PF_PACKET support. |
| 7540 | * If this is a *live* capture, we can look at |
| 7541 | * special meta-data in the filter expression; |
| 7542 | * if it's a savefile, we can't. |
| 7543 | */ |
| 7544 | if (bpf_pcap->rfile != NULL) { |
| 7545 | /* We have a FILE *, so this is a savefile */ |
| 7546 | bpf_error("inbound/outbound not supported on linktype %d when reading savefiles", |
| 7547 | linktype); |
| 7548 | b0 = NULL; |
| 7549 | /* NOTREACHED */ |
| 7550 | } |
| 7551 | /* match outgoing packets */ |
| 7552 | b0 = gen_cmp(OR_LINK, SKF_AD_OFF + SKF_AD_PKTTYPE, BPF_H, |
| 7553 | PACKET_OUTGOING); |
| 7554 | if (!dir) { |
| 7555 | /* to filter on inbound traffic, invert the match */ |
| 7556 | gen_not(b0); |
| 7557 | } |
| 7558 | #else /* defined(linux) && defined(PF_PACKET) && defined(SO_ATTACH_FILTER) */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7559 | bpf_error("inbound/outbound not supported on linktype %d", |
| 7560 | linktype); |
| 7561 | b0 = NULL; |
| 7562 | /* NOTREACHED */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7563 | #endif /* defined(linux) && defined(PF_PACKET) && defined(SO_ATTACH_FILTER) */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7564 | } |
| 7565 | return (b0); |
| 7566 | } |
| 7567 | |
| 7568 | #ifdef HAVE_NET_PFVAR_H |
| 7569 | /* PF firewall log matched interface */ |
| 7570 | struct block * |
| 7571 | gen_pf_ifname(const char *ifname) |
| 7572 | { |
| 7573 | struct block *b0; |
| 7574 | u_int len, off; |
| 7575 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7576 | if (linktype != DLT_PFLOG) { |
| 7577 | bpf_error("ifname supported only on PF linktype"); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7578 | /* NOTREACHED */ |
| 7579 | } |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7580 | len = sizeof(((struct pfloghdr *)0)->ifname); |
| 7581 | off = offsetof(struct pfloghdr, ifname); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7582 | if (strlen(ifname) >= len) { |
| 7583 | bpf_error("ifname interface names can only be %d characters", |
| 7584 | len-1); |
| 7585 | /* NOTREACHED */ |
| 7586 | } |
| 7587 | b0 = gen_bcmp(OR_LINK, off, strlen(ifname), (const u_char *)ifname); |
| 7588 | return (b0); |
| 7589 | } |
| 7590 | |
| 7591 | /* PF firewall log ruleset name */ |
| 7592 | struct block * |
| 7593 | gen_pf_ruleset(char *ruleset) |
| 7594 | { |
| 7595 | struct block *b0; |
| 7596 | |
| 7597 | if (linktype != DLT_PFLOG) { |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7598 | bpf_error("ruleset supported only on PF linktype"); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7599 | /* NOTREACHED */ |
| 7600 | } |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7601 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7602 | if (strlen(ruleset) >= sizeof(((struct pfloghdr *)0)->ruleset)) { |
| 7603 | bpf_error("ruleset names can only be %ld characters", |
| 7604 | (long)(sizeof(((struct pfloghdr *)0)->ruleset) - 1)); |
| 7605 | /* NOTREACHED */ |
| 7606 | } |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7607 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7608 | b0 = gen_bcmp(OR_LINK, offsetof(struct pfloghdr, ruleset), |
| 7609 | strlen(ruleset), (const u_char *)ruleset); |
| 7610 | return (b0); |
| 7611 | } |
| 7612 | |
| 7613 | /* PF firewall log rule number */ |
| 7614 | struct block * |
| 7615 | gen_pf_rnr(int rnr) |
| 7616 | { |
| 7617 | struct block *b0; |
| 7618 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7619 | if (linktype != DLT_PFLOG) { |
| 7620 | bpf_error("rnr supported only on PF linktype"); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7621 | /* NOTREACHED */ |
| 7622 | } |
| 7623 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7624 | b0 = gen_cmp(OR_LINK, offsetof(struct pfloghdr, rulenr), BPF_W, |
| 7625 | (bpf_int32)rnr); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7626 | return (b0); |
| 7627 | } |
| 7628 | |
| 7629 | /* PF firewall log sub-rule number */ |
| 7630 | struct block * |
| 7631 | gen_pf_srnr(int srnr) |
| 7632 | { |
| 7633 | struct block *b0; |
| 7634 | |
| 7635 | if (linktype != DLT_PFLOG) { |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7636 | bpf_error("srnr supported only on PF linktype"); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7637 | /* NOTREACHED */ |
| 7638 | } |
| 7639 | |
| 7640 | b0 = gen_cmp(OR_LINK, offsetof(struct pfloghdr, subrulenr), BPF_W, |
| 7641 | (bpf_int32)srnr); |
| 7642 | return (b0); |
| 7643 | } |
| 7644 | |
| 7645 | /* PF firewall log reason code */ |
| 7646 | struct block * |
| 7647 | gen_pf_reason(int reason) |
| 7648 | { |
| 7649 | struct block *b0; |
| 7650 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7651 | if (linktype != DLT_PFLOG) { |
| 7652 | bpf_error("reason supported only on PF linktype"); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7653 | /* NOTREACHED */ |
| 7654 | } |
| 7655 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7656 | b0 = gen_cmp(OR_LINK, offsetof(struct pfloghdr, reason), BPF_B, |
| 7657 | (bpf_int32)reason); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7658 | return (b0); |
| 7659 | } |
| 7660 | |
| 7661 | /* PF firewall log action */ |
| 7662 | struct block * |
| 7663 | gen_pf_action(int action) |
| 7664 | { |
| 7665 | struct block *b0; |
| 7666 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7667 | if (linktype != DLT_PFLOG) { |
| 7668 | bpf_error("action supported only on PF linktype"); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7669 | /* NOTREACHED */ |
| 7670 | } |
| 7671 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7672 | b0 = gen_cmp(OR_LINK, offsetof(struct pfloghdr, action), BPF_B, |
| 7673 | (bpf_int32)action); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7674 | return (b0); |
| 7675 | } |
| 7676 | #else /* !HAVE_NET_PFVAR_H */ |
| 7677 | struct block * |
| 7678 | gen_pf_ifname(const char *ifname) |
| 7679 | { |
| 7680 | bpf_error("libpcap was compiled without pf support"); |
| 7681 | /* NOTREACHED */ |
| 7682 | return (NULL); |
| 7683 | } |
| 7684 | |
| 7685 | struct block * |
| 7686 | gen_pf_ruleset(char *ruleset) |
| 7687 | { |
| 7688 | bpf_error("libpcap was compiled on a machine without pf support"); |
| 7689 | /* NOTREACHED */ |
| 7690 | return (NULL); |
| 7691 | } |
| 7692 | |
| 7693 | struct block * |
| 7694 | gen_pf_rnr(int rnr) |
| 7695 | { |
| 7696 | bpf_error("libpcap was compiled on a machine without pf support"); |
| 7697 | /* NOTREACHED */ |
| 7698 | return (NULL); |
| 7699 | } |
| 7700 | |
| 7701 | struct block * |
| 7702 | gen_pf_srnr(int srnr) |
| 7703 | { |
| 7704 | bpf_error("libpcap was compiled on a machine without pf support"); |
| 7705 | /* NOTREACHED */ |
| 7706 | return (NULL); |
| 7707 | } |
| 7708 | |
| 7709 | struct block * |
| 7710 | gen_pf_reason(int reason) |
| 7711 | { |
| 7712 | bpf_error("libpcap was compiled on a machine without pf support"); |
| 7713 | /* NOTREACHED */ |
| 7714 | return (NULL); |
| 7715 | } |
| 7716 | |
| 7717 | struct block * |
| 7718 | gen_pf_action(int action) |
| 7719 | { |
| 7720 | bpf_error("libpcap was compiled on a machine without pf support"); |
| 7721 | /* NOTREACHED */ |
| 7722 | return (NULL); |
| 7723 | } |
| 7724 | #endif /* HAVE_NET_PFVAR_H */ |
| 7725 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7726 | /* IEEE 802.11 wireless header */ |
| 7727 | struct block * |
| 7728 | gen_p80211_type(int type, int mask) |
| 7729 | { |
| 7730 | struct block *b0; |
| 7731 | |
| 7732 | switch (linktype) { |
| 7733 | |
| 7734 | case DLT_IEEE802_11: |
| 7735 | case DLT_PRISM_HEADER: |
| 7736 | case DLT_IEEE802_11_RADIO_AVS: |
| 7737 | case DLT_IEEE802_11_RADIO: |
| 7738 | b0 = gen_mcmp(OR_LINK, 0, BPF_B, (bpf_int32)type, |
| 7739 | (bpf_int32)mask); |
| 7740 | break; |
| 7741 | |
| 7742 | default: |
| 7743 | bpf_error("802.11 link-layer types supported only on 802.11"); |
| 7744 | /* NOTREACHED */ |
| 7745 | } |
| 7746 | |
| 7747 | return (b0); |
| 7748 | } |
| 7749 | |
| 7750 | struct block * |
| 7751 | gen_p80211_fcdir(int fcdir) |
| 7752 | { |
| 7753 | struct block *b0; |
| 7754 | |
| 7755 | switch (linktype) { |
| 7756 | |
| 7757 | case DLT_IEEE802_11: |
| 7758 | case DLT_PRISM_HEADER: |
| 7759 | case DLT_IEEE802_11_RADIO_AVS: |
| 7760 | case DLT_IEEE802_11_RADIO: |
| 7761 | break; |
| 7762 | |
| 7763 | default: |
| 7764 | bpf_error("frame direction supported only with 802.11 headers"); |
| 7765 | /* NOTREACHED */ |
| 7766 | } |
| 7767 | |
| 7768 | b0 = gen_mcmp(OR_LINK, 1, BPF_B, (bpf_int32)fcdir, |
| 7769 | (bpf_u_int32)IEEE80211_FC1_DIR_MASK); |
| 7770 | |
| 7771 | return (b0); |
| 7772 | } |
| 7773 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7774 | struct block * |
| 7775 | gen_acode(eaddr, q) |
| 7776 | register const u_char *eaddr; |
| 7777 | struct qual q; |
| 7778 | { |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7779 | switch (linktype) { |
| 7780 | |
| 7781 | case DLT_ARCNET: |
| 7782 | case DLT_ARCNET_LINUX: |
| 7783 | if ((q.addr == Q_HOST || q.addr == Q_DEFAULT) && |
| 7784 | q.proto == Q_LINK) |
| 7785 | return (gen_ahostop(eaddr, (int)q.dir)); |
| 7786 | else { |
| 7787 | bpf_error("ARCnet address used in non-arc expression"); |
| 7788 | /* NOTREACHED */ |
| 7789 | } |
| 7790 | break; |
| 7791 | |
| 7792 | default: |
| 7793 | bpf_error("aid supported only on ARCnet"); |
| 7794 | /* NOTREACHED */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7795 | } |
| 7796 | bpf_error("ARCnet address used in non-arc expression"); |
| 7797 | /* NOTREACHED */ |
| 7798 | return NULL; |
| 7799 | } |
| 7800 | |
| 7801 | static struct block * |
| 7802 | gen_ahostop(eaddr, dir) |
| 7803 | register const u_char *eaddr; |
| 7804 | register int dir; |
| 7805 | { |
| 7806 | register struct block *b0, *b1; |
| 7807 | |
| 7808 | switch (dir) { |
| 7809 | /* src comes first, different from Ethernet */ |
| 7810 | case Q_SRC: |
| 7811 | return gen_bcmp(OR_LINK, 0, 1, eaddr); |
| 7812 | |
| 7813 | case Q_DST: |
| 7814 | return gen_bcmp(OR_LINK, 1, 1, eaddr); |
| 7815 | |
| 7816 | case Q_AND: |
| 7817 | b0 = gen_ahostop(eaddr, Q_SRC); |
| 7818 | b1 = gen_ahostop(eaddr, Q_DST); |
| 7819 | gen_and(b0, b1); |
| 7820 | return b1; |
| 7821 | |
| 7822 | case Q_DEFAULT: |
| 7823 | case Q_OR: |
| 7824 | b0 = gen_ahostop(eaddr, Q_SRC); |
| 7825 | b1 = gen_ahostop(eaddr, Q_DST); |
| 7826 | gen_or(b0, b1); |
| 7827 | return b1; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7828 | |
| 7829 | case Q_ADDR1: |
| 7830 | bpf_error("'addr1' is only supported on 802.11"); |
| 7831 | break; |
| 7832 | |
| 7833 | case Q_ADDR2: |
| 7834 | bpf_error("'addr2' is only supported on 802.11"); |
| 7835 | break; |
| 7836 | |
| 7837 | case Q_ADDR3: |
| 7838 | bpf_error("'addr3' is only supported on 802.11"); |
| 7839 | break; |
| 7840 | |
| 7841 | case Q_ADDR4: |
| 7842 | bpf_error("'addr4' is only supported on 802.11"); |
| 7843 | break; |
| 7844 | |
| 7845 | case Q_RA: |
| 7846 | bpf_error("'ra' is only supported on 802.11"); |
| 7847 | break; |
| 7848 | |
| 7849 | case Q_TA: |
| 7850 | bpf_error("'ta' is only supported on 802.11"); |
| 7851 | break; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7852 | } |
| 7853 | abort(); |
| 7854 | /* NOTREACHED */ |
| 7855 | } |
| 7856 | |
| 7857 | /* |
| 7858 | * support IEEE 802.1Q VLAN trunk over ethernet |
| 7859 | */ |
| 7860 | struct block * |
| 7861 | gen_vlan(vlan_num) |
| 7862 | int vlan_num; |
| 7863 | { |
| 7864 | struct block *b0, *b1; |
| 7865 | |
| 7866 | /* can't check for VLAN-encapsulated packets inside MPLS */ |
| 7867 | if (label_stack_depth > 0) |
| 7868 | bpf_error("no VLAN match after MPLS"); |
| 7869 | |
| 7870 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7871 | * Check for a VLAN packet, and then change the offsets to point |
| 7872 | * to the type and data fields within the VLAN packet. Just |
| 7873 | * increment the offsets, so that we can support a hierarchy, e.g. |
| 7874 | * "vlan 300 && vlan 200" to capture VLAN 200 encapsulated within |
| 7875 | * VLAN 100. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7876 | * |
| 7877 | * XXX - this is a bit of a kludge. If we were to split the |
| 7878 | * compiler into a parser that parses an expression and |
| 7879 | * generates an expression tree, and a code generator that |
| 7880 | * takes an expression tree (which could come from our |
| 7881 | * parser or from some other parser) and generates BPF code, |
| 7882 | * we could perhaps make the offsets parameters of routines |
| 7883 | * and, in the handler for an "AND" node, pass to subnodes |
| 7884 | * other than the VLAN node the adjusted offsets. |
| 7885 | * |
| 7886 | * This would mean that "vlan" would, instead of changing the |
| 7887 | * behavior of *all* tests after it, change only the behavior |
| 7888 | * of tests ANDed with it. That would change the documented |
| 7889 | * semantics of "vlan", which might break some expressions. |
| 7890 | * However, it would mean that "(vlan and ip) or ip" would check |
| 7891 | * both for VLAN-encapsulated IP and IP-over-Ethernet, rather than |
| 7892 | * checking only for VLAN-encapsulated IP, so that could still |
| 7893 | * be considered worth doing; it wouldn't break expressions |
| 7894 | * that are of the form "vlan and ..." or "vlan N and ...", |
| 7895 | * which I suspect are the most common expressions involving |
| 7896 | * "vlan". "vlan or ..." doesn't necessarily do what the user |
| 7897 | * would really want, now, as all the "or ..." tests would |
| 7898 | * be done assuming a VLAN, even though the "or" could be viewed |
| 7899 | * as meaning "or, if this isn't a VLAN packet...". |
| 7900 | */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7901 | orig_nl = off_nl; |
| 7902 | |
| 7903 | switch (linktype) { |
| 7904 | |
| 7905 | case DLT_EN10MB: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7906 | case DLT_NETANALYZER: |
| 7907 | case DLT_NETANALYZER_TRANSPARENT: |
| 7908 | /* check for VLAN, including QinQ */ |
| 7909 | b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, |
| 7910 | (bpf_int32)ETHERTYPE_8021Q); |
| 7911 | b1 = gen_cmp(OR_LINK, off_linktype, BPF_H, |
| 7912 | (bpf_int32)ETHERTYPE_8021QINQ); |
| 7913 | gen_or(b0,b1); |
| 7914 | b0 = b1; |
| 7915 | |
| 7916 | /* If a specific VLAN is requested, check VLAN id */ |
| 7917 | if (vlan_num >= 0) { |
| 7918 | b1 = gen_mcmp(OR_MACPL, 0, BPF_H, |
| 7919 | (bpf_int32)vlan_num, 0x0fff); |
| 7920 | gen_and(b0, b1); |
| 7921 | b0 = b1; |
| 7922 | } |
| 7923 | |
| 7924 | off_macpl += 4; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7925 | off_linktype += 4; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7926 | #if 0 |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7927 | off_nl_nosnap += 4; |
| 7928 | off_nl += 4; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7929 | #endif |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7930 | break; |
| 7931 | |
| 7932 | default: |
| 7933 | bpf_error("no VLAN support for data link type %d", |
| 7934 | linktype); |
| 7935 | /*NOTREACHED*/ |
| 7936 | } |
| 7937 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7938 | return (b0); |
| 7939 | } |
| 7940 | |
| 7941 | /* |
| 7942 | * support for MPLS |
| 7943 | */ |
| 7944 | struct block * |
| 7945 | gen_mpls(label_num) |
| 7946 | int label_num; |
| 7947 | { |
| 7948 | struct block *b0,*b1; |
| 7949 | |
| 7950 | /* |
| 7951 | * Change the offsets to point to the type and data fields within |
| 7952 | * the MPLS packet. Just increment the offsets, so that we |
| 7953 | * can support a hierarchy, e.g. "mpls 100000 && mpls 1024" to |
| 7954 | * capture packets with an outer label of 100000 and an inner |
| 7955 | * label of 1024. |
| 7956 | * |
| 7957 | * XXX - this is a bit of a kludge. See comments in gen_vlan(). |
| 7958 | */ |
| 7959 | orig_nl = off_nl; |
| 7960 | |
| 7961 | if (label_stack_depth > 0) { |
| 7962 | /* just match the bottom-of-stack bit clear */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7963 | b0 = gen_mcmp(OR_MACPL, orig_nl-2, BPF_B, 0, 0x01); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7964 | } else { |
| 7965 | /* |
| 7966 | * Indicate that we're checking MPLS-encapsulated headers, |
| 7967 | * to make sure higher level code generators don't try to |
| 7968 | * match against IP-related protocols such as Q_ARP, Q_RARP |
| 7969 | * etc. |
| 7970 | */ |
| 7971 | switch (linktype) { |
| 7972 | |
| 7973 | case DLT_C_HDLC: /* fall through */ |
| 7974 | case DLT_EN10MB: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 7975 | case DLT_NETANALYZER: |
| 7976 | case DLT_NETANALYZER_TRANSPARENT: |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7977 | b0 = gen_linktype(ETHERTYPE_MPLS); |
| 7978 | break; |
| 7979 | |
| 7980 | case DLT_PPP: |
| 7981 | b0 = gen_linktype(PPP_MPLS_UCAST); |
| 7982 | break; |
| 7983 | |
| 7984 | /* FIXME add other DLT_s ... |
| 7985 | * for Frame-Relay/and ATM this may get messy due to SNAP headers |
| 7986 | * leave it for now */ |
| 7987 | |
| 7988 | default: |
| 7989 | bpf_error("no MPLS support for data link type %d", |
| 7990 | linktype); |
| 7991 | b0 = NULL; |
| 7992 | /*NOTREACHED*/ |
| 7993 | break; |
| 7994 | } |
| 7995 | } |
| 7996 | |
| 7997 | /* If a specific MPLS label is requested, check it */ |
| 7998 | if (label_num >= 0) { |
| 7999 | label_num = label_num << 12; /* label is shifted 12 bits on the wire */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8000 | b1 = gen_mcmp(OR_MACPL, orig_nl, BPF_W, (bpf_int32)label_num, |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8001 | 0xfffff000); /* only compare the first 20 bits */ |
| 8002 | gen_and(b0, b1); |
| 8003 | b0 = b1; |
| 8004 | } |
| 8005 | |
| 8006 | off_nl_nosnap += 4; |
| 8007 | off_nl += 4; |
| 8008 | label_stack_depth++; |
| 8009 | return (b0); |
| 8010 | } |
| 8011 | |
| 8012 | /* |
| 8013 | * Support PPPOE discovery and session. |
| 8014 | */ |
| 8015 | struct block * |
| 8016 | gen_pppoed() |
| 8017 | { |
| 8018 | /* check for PPPoE discovery */ |
| 8019 | return gen_linktype((bpf_int32)ETHERTYPE_PPPOED); |
| 8020 | } |
| 8021 | |
| 8022 | struct block * |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8023 | gen_pppoes(sess_num) |
| 8024 | int sess_num; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8025 | { |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8026 | struct block *b0, *b1; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8027 | |
| 8028 | /* |
| 8029 | * Test against the PPPoE session link-layer type. |
| 8030 | */ |
| 8031 | b0 = gen_linktype((bpf_int32)ETHERTYPE_PPPOES); |
| 8032 | |
| 8033 | /* |
| 8034 | * Change the offsets to point to the type and data fields within |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8035 | * the PPP packet, and note that this is PPPoE rather than |
| 8036 | * raw PPP. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8037 | * |
| 8038 | * XXX - this is a bit of a kludge. If we were to split the |
| 8039 | * compiler into a parser that parses an expression and |
| 8040 | * generates an expression tree, and a code generator that |
| 8041 | * takes an expression tree (which could come from our |
| 8042 | * parser or from some other parser) and generates BPF code, |
| 8043 | * we could perhaps make the offsets parameters of routines |
| 8044 | * and, in the handler for an "AND" node, pass to subnodes |
| 8045 | * other than the PPPoE node the adjusted offsets. |
| 8046 | * |
| 8047 | * This would mean that "pppoes" would, instead of changing the |
| 8048 | * behavior of *all* tests after it, change only the behavior |
| 8049 | * of tests ANDed with it. That would change the documented |
| 8050 | * semantics of "pppoes", which might break some expressions. |
| 8051 | * However, it would mean that "(pppoes and ip) or ip" would check |
| 8052 | * both for VLAN-encapsulated IP and IP-over-Ethernet, rather than |
| 8053 | * checking only for VLAN-encapsulated IP, so that could still |
| 8054 | * be considered worth doing; it wouldn't break expressions |
| 8055 | * that are of the form "pppoes and ..." which I suspect are the |
| 8056 | * most common expressions involving "pppoes". "pppoes or ..." |
| 8057 | * doesn't necessarily do what the user would really want, now, |
| 8058 | * as all the "or ..." tests would be done assuming PPPoE, even |
| 8059 | * though the "or" could be viewed as meaning "or, if this isn't |
| 8060 | * a PPPoE packet...". |
| 8061 | */ |
| 8062 | orig_linktype = off_linktype; /* save original values */ |
| 8063 | orig_nl = off_nl; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8064 | is_pppoes = 1; |
| 8065 | |
| 8066 | /* If a specific session is requested, check PPPoE session id */ |
| 8067 | if (sess_num >= 0) { |
| 8068 | b1 = gen_mcmp(OR_MACPL, orig_nl, BPF_W, |
| 8069 | (bpf_int32)sess_num, 0x0000ffff); |
| 8070 | gen_and(b0, b1); |
| 8071 | b0 = b1; |
| 8072 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8073 | |
| 8074 | /* |
| 8075 | * The "network-layer" protocol is PPPoE, which has a 6-byte |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8076 | * PPPoE header, followed by a PPP packet. |
| 8077 | * |
| 8078 | * There is no HDLC encapsulation for the PPP packet (it's |
| 8079 | * encapsulated in PPPoES instead), so the link-layer type |
| 8080 | * starts at the first byte of the PPP packet. For PPPoE, |
| 8081 | * that offset is relative to the beginning of the total |
| 8082 | * link-layer payload, including any 802.2 LLC header, so |
| 8083 | * it's 6 bytes past off_nl. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8084 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8085 | off_linktype = off_nl + 6; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8086 | |
| 8087 | /* |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8088 | * The network-layer offsets are relative to the beginning |
| 8089 | * of the MAC-layer payload; that's past the 6-byte |
| 8090 | * PPPoE header and the 2-byte PPP header. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8091 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8092 | off_nl = 6+2; |
| 8093 | off_nl_nosnap = 6+2; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8094 | |
| 8095 | return b0; |
| 8096 | } |
| 8097 | |
| 8098 | struct block * |
| 8099 | gen_atmfield_code(atmfield, jvalue, jtype, reverse) |
| 8100 | int atmfield; |
| 8101 | bpf_int32 jvalue; |
| 8102 | bpf_u_int32 jtype; |
| 8103 | int reverse; |
| 8104 | { |
| 8105 | struct block *b0; |
| 8106 | |
| 8107 | switch (atmfield) { |
| 8108 | |
| 8109 | case A_VPI: |
| 8110 | if (!is_atm) |
| 8111 | bpf_error("'vpi' supported only on raw ATM"); |
| 8112 | if (off_vpi == (u_int)-1) |
| 8113 | abort(); |
| 8114 | b0 = gen_ncmp(OR_LINK, off_vpi, BPF_B, 0xffffffff, jtype, |
| 8115 | reverse, jvalue); |
| 8116 | break; |
| 8117 | |
| 8118 | case A_VCI: |
| 8119 | if (!is_atm) |
| 8120 | bpf_error("'vci' supported only on raw ATM"); |
| 8121 | if (off_vci == (u_int)-1) |
| 8122 | abort(); |
| 8123 | b0 = gen_ncmp(OR_LINK, off_vci, BPF_H, 0xffffffff, jtype, |
| 8124 | reverse, jvalue); |
| 8125 | break; |
| 8126 | |
| 8127 | case A_PROTOTYPE: |
| 8128 | if (off_proto == (u_int)-1) |
| 8129 | abort(); /* XXX - this isn't on FreeBSD */ |
| 8130 | b0 = gen_ncmp(OR_LINK, off_proto, BPF_B, 0x0f, jtype, |
| 8131 | reverse, jvalue); |
| 8132 | break; |
| 8133 | |
| 8134 | case A_MSGTYPE: |
| 8135 | if (off_payload == (u_int)-1) |
| 8136 | abort(); |
| 8137 | b0 = gen_ncmp(OR_LINK, off_payload + MSG_TYPE_POS, BPF_B, |
| 8138 | 0xffffffff, jtype, reverse, jvalue); |
| 8139 | break; |
| 8140 | |
| 8141 | case A_CALLREFTYPE: |
| 8142 | if (!is_atm) |
| 8143 | bpf_error("'callref' supported only on raw ATM"); |
| 8144 | if (off_proto == (u_int)-1) |
| 8145 | abort(); |
| 8146 | b0 = gen_ncmp(OR_LINK, off_proto, BPF_B, 0xffffffff, |
| 8147 | jtype, reverse, jvalue); |
| 8148 | break; |
| 8149 | |
| 8150 | default: |
| 8151 | abort(); |
| 8152 | } |
| 8153 | return b0; |
| 8154 | } |
| 8155 | |
| 8156 | struct block * |
| 8157 | gen_atmtype_abbrev(type) |
| 8158 | int type; |
| 8159 | { |
| 8160 | struct block *b0, *b1; |
| 8161 | |
| 8162 | switch (type) { |
| 8163 | |
| 8164 | case A_METAC: |
| 8165 | /* Get all packets in Meta signalling Circuit */ |
| 8166 | if (!is_atm) |
| 8167 | bpf_error("'metac' supported only on raw ATM"); |
| 8168 | b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0); |
| 8169 | b1 = gen_atmfield_code(A_VCI, 1, BPF_JEQ, 0); |
| 8170 | gen_and(b0, b1); |
| 8171 | break; |
| 8172 | |
| 8173 | case A_BCC: |
| 8174 | /* Get all packets in Broadcast Circuit*/ |
| 8175 | if (!is_atm) |
| 8176 | bpf_error("'bcc' supported only on raw ATM"); |
| 8177 | b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0); |
| 8178 | b1 = gen_atmfield_code(A_VCI, 2, BPF_JEQ, 0); |
| 8179 | gen_and(b0, b1); |
| 8180 | break; |
| 8181 | |
| 8182 | case A_OAMF4SC: |
| 8183 | /* Get all cells in Segment OAM F4 circuit*/ |
| 8184 | if (!is_atm) |
| 8185 | bpf_error("'oam4sc' supported only on raw ATM"); |
| 8186 | b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0); |
| 8187 | b1 = gen_atmfield_code(A_VCI, 3, BPF_JEQ, 0); |
| 8188 | gen_and(b0, b1); |
| 8189 | break; |
| 8190 | |
| 8191 | case A_OAMF4EC: |
| 8192 | /* Get all cells in End-to-End OAM F4 Circuit*/ |
| 8193 | if (!is_atm) |
| 8194 | bpf_error("'oam4ec' supported only on raw ATM"); |
| 8195 | b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0); |
| 8196 | b1 = gen_atmfield_code(A_VCI, 4, BPF_JEQ, 0); |
| 8197 | gen_and(b0, b1); |
| 8198 | break; |
| 8199 | |
| 8200 | case A_SC: |
| 8201 | /* Get all packets in connection Signalling Circuit */ |
| 8202 | if (!is_atm) |
| 8203 | bpf_error("'sc' supported only on raw ATM"); |
| 8204 | b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0); |
| 8205 | b1 = gen_atmfield_code(A_VCI, 5, BPF_JEQ, 0); |
| 8206 | gen_and(b0, b1); |
| 8207 | break; |
| 8208 | |
| 8209 | case A_ILMIC: |
| 8210 | /* Get all packets in ILMI Circuit */ |
| 8211 | if (!is_atm) |
| 8212 | bpf_error("'ilmic' supported only on raw ATM"); |
| 8213 | b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0); |
| 8214 | b1 = gen_atmfield_code(A_VCI, 16, BPF_JEQ, 0); |
| 8215 | gen_and(b0, b1); |
| 8216 | break; |
| 8217 | |
| 8218 | case A_LANE: |
| 8219 | /* Get all LANE packets */ |
| 8220 | if (!is_atm) |
| 8221 | bpf_error("'lane' supported only on raw ATM"); |
| 8222 | b1 = gen_atmfield_code(A_PROTOTYPE, PT_LANE, BPF_JEQ, 0); |
| 8223 | |
| 8224 | /* |
| 8225 | * Arrange that all subsequent tests assume LANE |
| 8226 | * rather than LLC-encapsulated packets, and set |
| 8227 | * the offsets appropriately for LANE-encapsulated |
| 8228 | * Ethernet. |
| 8229 | * |
| 8230 | * "off_mac" is the offset of the Ethernet header, |
| 8231 | * which is 2 bytes past the ATM pseudo-header |
| 8232 | * (skipping the pseudo-header and 2-byte LE Client |
| 8233 | * field). The other offsets are Ethernet offsets |
| 8234 | * relative to "off_mac". |
| 8235 | */ |
| 8236 | is_lane = 1; |
| 8237 | off_mac = off_payload + 2; /* MAC header */ |
| 8238 | off_linktype = off_mac + 12; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8239 | off_macpl = off_mac + 14; /* Ethernet */ |
| 8240 | off_nl = 0; /* Ethernet II */ |
| 8241 | off_nl_nosnap = 3; /* 802.3+802.2 */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8242 | break; |
| 8243 | |
| 8244 | case A_LLC: |
| 8245 | /* Get all LLC-encapsulated packets */ |
| 8246 | if (!is_atm) |
| 8247 | bpf_error("'llc' supported only on raw ATM"); |
| 8248 | b1 = gen_atmfield_code(A_PROTOTYPE, PT_LLC, BPF_JEQ, 0); |
| 8249 | is_lane = 0; |
| 8250 | break; |
| 8251 | |
| 8252 | default: |
| 8253 | abort(); |
| 8254 | } |
| 8255 | return b1; |
| 8256 | } |
| 8257 | |
| 8258 | /* |
| 8259 | * Filtering for MTP2 messages based on li value |
| 8260 | * FISU, length is null |
| 8261 | * LSSU, length is 1 or 2 |
| 8262 | * MSU, length is 3 or more |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8263 | * For MTP2_HSL, sequences are on 2 bytes, and length on 9 bits |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8264 | */ |
| 8265 | struct block * |
| 8266 | gen_mtp2type_abbrev(type) |
| 8267 | int type; |
| 8268 | { |
| 8269 | struct block *b0, *b1; |
| 8270 | |
| 8271 | switch (type) { |
| 8272 | |
| 8273 | case M_FISU: |
| 8274 | if ( (linktype != DLT_MTP2) && |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8275 | (linktype != DLT_ERF) && |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8276 | (linktype != DLT_MTP2_WITH_PHDR) ) |
| 8277 | bpf_error("'fisu' supported only on MTP2"); |
| 8278 | /* gen_ncmp(offrel, offset, size, mask, jtype, reverse, value) */ |
| 8279 | b0 = gen_ncmp(OR_PACKET, off_li, BPF_B, 0x3f, BPF_JEQ, 0, 0); |
| 8280 | break; |
| 8281 | |
| 8282 | case M_LSSU: |
| 8283 | if ( (linktype != DLT_MTP2) && |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8284 | (linktype != DLT_ERF) && |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8285 | (linktype != DLT_MTP2_WITH_PHDR) ) |
| 8286 | bpf_error("'lssu' supported only on MTP2"); |
| 8287 | b0 = gen_ncmp(OR_PACKET, off_li, BPF_B, 0x3f, BPF_JGT, 1, 2); |
| 8288 | b1 = gen_ncmp(OR_PACKET, off_li, BPF_B, 0x3f, BPF_JGT, 0, 0); |
| 8289 | gen_and(b1, b0); |
| 8290 | break; |
| 8291 | |
| 8292 | case M_MSU: |
| 8293 | if ( (linktype != DLT_MTP2) && |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8294 | (linktype != DLT_ERF) && |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8295 | (linktype != DLT_MTP2_WITH_PHDR) ) |
| 8296 | bpf_error("'msu' supported only on MTP2"); |
| 8297 | b0 = gen_ncmp(OR_PACKET, off_li, BPF_B, 0x3f, BPF_JGT, 0, 2); |
| 8298 | break; |
| 8299 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8300 | case MH_FISU: |
| 8301 | if ( (linktype != DLT_MTP2) && |
| 8302 | (linktype != DLT_ERF) && |
| 8303 | (linktype != DLT_MTP2_WITH_PHDR) ) |
| 8304 | bpf_error("'hfisu' supported only on MTP2_HSL"); |
| 8305 | /* gen_ncmp(offrel, offset, size, mask, jtype, reverse, value) */ |
| 8306 | b0 = gen_ncmp(OR_PACKET, off_li_hsl, BPF_H, 0xff80, BPF_JEQ, 0, 0); |
| 8307 | break; |
| 8308 | |
| 8309 | case MH_LSSU: |
| 8310 | if ( (linktype != DLT_MTP2) && |
| 8311 | (linktype != DLT_ERF) && |
| 8312 | (linktype != DLT_MTP2_WITH_PHDR) ) |
| 8313 | bpf_error("'hlssu' supported only on MTP2_HSL"); |
| 8314 | b0 = gen_ncmp(OR_PACKET, off_li_hsl, BPF_H, 0xff80, BPF_JGT, 1, 0x0100); |
| 8315 | b1 = gen_ncmp(OR_PACKET, off_li_hsl, BPF_H, 0xff80, BPF_JGT, 0, 0); |
| 8316 | gen_and(b1, b0); |
| 8317 | break; |
| 8318 | |
| 8319 | case MH_MSU: |
| 8320 | if ( (linktype != DLT_MTP2) && |
| 8321 | (linktype != DLT_ERF) && |
| 8322 | (linktype != DLT_MTP2_WITH_PHDR) ) |
| 8323 | bpf_error("'hmsu' supported only on MTP2_HSL"); |
| 8324 | b0 = gen_ncmp(OR_PACKET, off_li_hsl, BPF_H, 0xff80, BPF_JGT, 0, 0x0100); |
| 8325 | break; |
| 8326 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8327 | default: |
| 8328 | abort(); |
| 8329 | } |
| 8330 | return b0; |
| 8331 | } |
| 8332 | |
| 8333 | struct block * |
| 8334 | gen_mtp3field_code(mtp3field, jvalue, jtype, reverse) |
| 8335 | int mtp3field; |
| 8336 | bpf_u_int32 jvalue; |
| 8337 | bpf_u_int32 jtype; |
| 8338 | int reverse; |
| 8339 | { |
| 8340 | struct block *b0; |
| 8341 | bpf_u_int32 val1 , val2 , val3; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8342 | u_int newoff_sio=off_sio; |
| 8343 | u_int newoff_opc=off_opc; |
| 8344 | u_int newoff_dpc=off_dpc; |
| 8345 | u_int newoff_sls=off_sls; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8346 | |
| 8347 | switch (mtp3field) { |
| 8348 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8349 | case MH_SIO: |
| 8350 | newoff_sio += 3; /* offset for MTP2_HSL */ |
| 8351 | /* FALLTHROUGH */ |
| 8352 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8353 | case M_SIO: |
| 8354 | if (off_sio == (u_int)-1) |
| 8355 | bpf_error("'sio' supported only on SS7"); |
| 8356 | /* sio coded on 1 byte so max value 255 */ |
| 8357 | if(jvalue > 255) |
| 8358 | bpf_error("sio value %u too big; max value = 255", |
| 8359 | jvalue); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8360 | b0 = gen_ncmp(OR_PACKET, newoff_sio, BPF_B, 0xffffffff, |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8361 | (u_int)jtype, reverse, (u_int)jvalue); |
| 8362 | break; |
| 8363 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8364 | case MH_OPC: |
| 8365 | newoff_opc+=3; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8366 | case M_OPC: |
| 8367 | if (off_opc == (u_int)-1) |
| 8368 | bpf_error("'opc' supported only on SS7"); |
| 8369 | /* opc coded on 14 bits so max value 16383 */ |
| 8370 | if (jvalue > 16383) |
| 8371 | bpf_error("opc value %u too big; max value = 16383", |
| 8372 | jvalue); |
| 8373 | /* the following instructions are made to convert jvalue |
| 8374 | * to the form used to write opc in an ss7 message*/ |
| 8375 | val1 = jvalue & 0x00003c00; |
| 8376 | val1 = val1 >>10; |
| 8377 | val2 = jvalue & 0x000003fc; |
| 8378 | val2 = val2 <<6; |
| 8379 | val3 = jvalue & 0x00000003; |
| 8380 | val3 = val3 <<22; |
| 8381 | jvalue = val1 + val2 + val3; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8382 | b0 = gen_ncmp(OR_PACKET, newoff_opc, BPF_W, 0x00c0ff0f, |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8383 | (u_int)jtype, reverse, (u_int)jvalue); |
| 8384 | break; |
| 8385 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8386 | case MH_DPC: |
| 8387 | newoff_dpc += 3; |
| 8388 | /* FALLTHROUGH */ |
| 8389 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8390 | case M_DPC: |
| 8391 | if (off_dpc == (u_int)-1) |
| 8392 | bpf_error("'dpc' supported only on SS7"); |
| 8393 | /* dpc coded on 14 bits so max value 16383 */ |
| 8394 | if (jvalue > 16383) |
| 8395 | bpf_error("dpc value %u too big; max value = 16383", |
| 8396 | jvalue); |
| 8397 | /* the following instructions are made to convert jvalue |
| 8398 | * to the forme used to write dpc in an ss7 message*/ |
| 8399 | val1 = jvalue & 0x000000ff; |
| 8400 | val1 = val1 << 24; |
| 8401 | val2 = jvalue & 0x00003f00; |
| 8402 | val2 = val2 << 8; |
| 8403 | jvalue = val1 + val2; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8404 | b0 = gen_ncmp(OR_PACKET, newoff_dpc, BPF_W, 0xff3f0000, |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8405 | (u_int)jtype, reverse, (u_int)jvalue); |
| 8406 | break; |
| 8407 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8408 | case MH_SLS: |
| 8409 | newoff_sls+=3; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8410 | case M_SLS: |
| 8411 | if (off_sls == (u_int)-1) |
| 8412 | bpf_error("'sls' supported only on SS7"); |
| 8413 | /* sls coded on 4 bits so max value 15 */ |
| 8414 | if (jvalue > 15) |
| 8415 | bpf_error("sls value %u too big; max value = 15", |
| 8416 | jvalue); |
| 8417 | /* the following instruction is made to convert jvalue |
| 8418 | * to the forme used to write sls in an ss7 message*/ |
| 8419 | jvalue = jvalue << 4; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 8420 | b0 = gen_ncmp(OR_PACKET, newoff_sls, BPF_B, 0xf0, |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 8421 | (u_int)jtype,reverse, (u_int)jvalue); |
| 8422 | break; |
| 8423 | |
| 8424 | default: |
| 8425 | abort(); |
| 8426 | } |
| 8427 | return b0; |
| 8428 | } |
| 8429 | |
| 8430 | static struct block * |
| 8431 | gen_msg_abbrev(type) |
| 8432 | int type; |
| 8433 | { |
| 8434 | struct block *b1; |
| 8435 | |
| 8436 | /* |
| 8437 | * Q.2931 signalling protocol messages for handling virtual circuits |
| 8438 | * establishment and teardown |
| 8439 | */ |
| 8440 | switch (type) { |
| 8441 | |
| 8442 | case A_SETUP: |
| 8443 | b1 = gen_atmfield_code(A_MSGTYPE, SETUP, BPF_JEQ, 0); |
| 8444 | break; |
| 8445 | |
| 8446 | case A_CALLPROCEED: |
| 8447 | b1 = gen_atmfield_code(A_MSGTYPE, CALL_PROCEED, BPF_JEQ, 0); |
| 8448 | break; |
| 8449 | |
| 8450 | case A_CONNECT: |
| 8451 | b1 = gen_atmfield_code(A_MSGTYPE, CONNECT, BPF_JEQ, 0); |
| 8452 | break; |
| 8453 | |
| 8454 | case A_CONNECTACK: |
| 8455 | b1 = gen_atmfield_code(A_MSGTYPE, CONNECT_ACK, BPF_JEQ, 0); |
| 8456 | break; |
| 8457 | |
| 8458 | case A_RELEASE: |
| 8459 | b1 = gen_atmfield_code(A_MSGTYPE, RELEASE, BPF_JEQ, 0); |
| 8460 | break; |
| 8461 | |
| 8462 | case A_RELEASE_DONE: |
| 8463 | b1 = gen_atmfield_code(A_MSGTYPE, RELEASE_DONE, BPF_JEQ, 0); |
| 8464 | break; |
| 8465 | |
| 8466 | default: |
| 8467 | abort(); |
| 8468 | } |
| 8469 | return b1; |
| 8470 | } |
| 8471 | |
| 8472 | struct block * |
| 8473 | gen_atmmulti_abbrev(type) |
| 8474 | int type; |
| 8475 | { |
| 8476 | struct block *b0, *b1; |
| 8477 | |
| 8478 | switch (type) { |
| 8479 | |
| 8480 | case A_OAM: |
| 8481 | if (!is_atm) |
| 8482 | bpf_error("'oam' supported only on raw ATM"); |
| 8483 | b1 = gen_atmmulti_abbrev(A_OAMF4); |
| 8484 | break; |
| 8485 | |
| 8486 | case A_OAMF4: |
| 8487 | if (!is_atm) |
| 8488 | bpf_error("'oamf4' supported only on raw ATM"); |
| 8489 | /* OAM F4 type */ |
| 8490 | b0 = gen_atmfield_code(A_VCI, 3, BPF_JEQ, 0); |
| 8491 | b1 = gen_atmfield_code(A_VCI, 4, BPF_JEQ, 0); |
| 8492 | gen_or(b0, b1); |
| 8493 | b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0); |
| 8494 | gen_and(b0, b1); |
| 8495 | break; |
| 8496 | |
| 8497 | case A_CONNECTMSG: |
| 8498 | /* |
| 8499 | * Get Q.2931 signalling messages for switched |
| 8500 | * virtual connection |
| 8501 | */ |
| 8502 | if (!is_atm) |
| 8503 | bpf_error("'connectmsg' supported only on raw ATM"); |
| 8504 | b0 = gen_msg_abbrev(A_SETUP); |
| 8505 | b1 = gen_msg_abbrev(A_CALLPROCEED); |
| 8506 | gen_or(b0, b1); |
| 8507 | b0 = gen_msg_abbrev(A_CONNECT); |
| 8508 | gen_or(b0, b1); |
| 8509 | b0 = gen_msg_abbrev(A_CONNECTACK); |
| 8510 | gen_or(b0, b1); |
| 8511 | b0 = gen_msg_abbrev(A_RELEASE); |
| 8512 | gen_or(b0, b1); |
| 8513 | b0 = gen_msg_abbrev(A_RELEASE_DONE); |
| 8514 | gen_or(b0, b1); |
| 8515 | b0 = gen_atmtype_abbrev(A_SC); |
| 8516 | gen_and(b0, b1); |
| 8517 | break; |
| 8518 | |
| 8519 | case A_METACONNECT: |
| 8520 | if (!is_atm) |
| 8521 | bpf_error("'metaconnect' supported only on raw ATM"); |
| 8522 | b0 = gen_msg_abbrev(A_SETUP); |
| 8523 | b1 = gen_msg_abbrev(A_CALLPROCEED); |
| 8524 | gen_or(b0, b1); |
| 8525 | b0 = gen_msg_abbrev(A_CONNECT); |
| 8526 | gen_or(b0, b1); |
| 8527 | b0 = gen_msg_abbrev(A_RELEASE); |
| 8528 | gen_or(b0, b1); |
| 8529 | b0 = gen_msg_abbrev(A_RELEASE_DONE); |
| 8530 | gen_or(b0, b1); |
| 8531 | b0 = gen_atmtype_abbrev(A_METAC); |
| 8532 | gen_and(b0, b1); |
| 8533 | break; |
| 8534 | |
| 8535 | default: |
| 8536 | abort(); |
| 8537 | } |
| 8538 | return b1; |
| 8539 | } |