The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that: (1) source code distributions |
| 7 | * retain the above copyright notice and this paragraph in its entirety, (2) |
| 8 | * distributions including binary code include the above copyright notice and |
| 9 | * this paragraph in its entirety in the documentation or other materials |
| 10 | * provided with the distribution, and (3) all advertising materials mentioning |
| 11 | * features or use of this software display the following acknowledgement: |
| 12 | * ``This product includes software developed by the University of California, |
| 13 | * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| 14 | * the University nor the names of its contributors may be used to endorse |
| 15 | * or promote products derived from this software without specific prior |
| 16 | * written permission. |
| 17 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| 18 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| 19 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 20 | */ |
| 21 | |
| 22 | #ifndef lint |
| 23 | static const char rcsid[] _U_ = |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 24 | "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.159 2007-09-14 01:29:28 guy Exp $ (LBL)"; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 25 | #endif |
| 26 | |
| 27 | #ifdef HAVE_CONFIG_H |
| 28 | #include "config.h" |
| 29 | #endif |
| 30 | |
| 31 | #include <tcpdump-stdinc.h> |
| 32 | |
| 33 | #include <stdio.h> |
| 34 | #include <stdlib.h> |
| 35 | #include <string.h> |
| 36 | |
| 37 | #include "addrtoname.h" |
| 38 | #include "interface.h" |
| 39 | #include "extract.h" /* must come after interface.h */ |
| 40 | |
| 41 | #include "ip.h" |
| 42 | #include "ipproto.h" |
| 43 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 44 | static const struct tok ip_option_values[] = { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 45 | { IPOPT_EOL, "EOL" }, |
| 46 | { IPOPT_NOP, "NOP" }, |
| 47 | { IPOPT_TS, "timestamp" }, |
| 48 | { IPOPT_SECURITY, "security" }, |
| 49 | { IPOPT_RR, "RR" }, |
| 50 | { IPOPT_SSRR, "SSRR" }, |
| 51 | { IPOPT_LSRR, "LSRR" }, |
| 52 | { IPOPT_RA, "RA" }, |
| 53 | { IPOPT_RFC1393, "traceroute" }, |
| 54 | { 0, NULL } |
| 55 | }; |
| 56 | |
| 57 | /* |
| 58 | * print the recorded route in an IP RR, LSRR or SSRR option. |
| 59 | */ |
| 60 | static void |
| 61 | ip_printroute(register const u_char *cp, u_int length) |
| 62 | { |
| 63 | register u_int ptr; |
| 64 | register u_int len; |
| 65 | |
| 66 | if (length < 3) { |
| 67 | printf(" [bad length %u]", length); |
| 68 | return; |
| 69 | } |
| 70 | if ((length + 1) & 3) |
| 71 | printf(" [bad length %u]", length); |
| 72 | ptr = cp[2] - 1; |
| 73 | if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1) |
| 74 | printf(" [bad ptr %u]", cp[2]); |
| 75 | |
| 76 | for (len = 3; len < length; len += 4) { |
| 77 | printf(" %s", ipaddr_string(&cp[len])); |
| 78 | if (ptr > len) |
| 79 | printf(","); |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | /* |
| 84 | * If source-routing is present and valid, return the final destination. |
| 85 | * Otherwise, return IP destination. |
| 86 | * |
| 87 | * This is used for UDP and TCP pseudo-header in the checksum |
| 88 | * calculation. |
| 89 | */ |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 90 | static u_int32_t |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 91 | ip_finddst(const struct ip *ip) |
| 92 | { |
| 93 | int length; |
| 94 | int len; |
| 95 | const u_char *cp; |
| 96 | u_int32_t retval; |
| 97 | |
| 98 | cp = (const u_char *)(ip + 1); |
| 99 | length = (IP_HL(ip) << 2) - sizeof(struct ip); |
| 100 | |
| 101 | for (; length > 0; cp += len, length -= len) { |
| 102 | int tt; |
| 103 | |
| 104 | TCHECK(*cp); |
| 105 | tt = *cp; |
| 106 | if (tt == IPOPT_EOL) |
| 107 | break; |
| 108 | else if (tt == IPOPT_NOP) |
| 109 | len = 1; |
| 110 | else { |
| 111 | TCHECK(cp[1]); |
| 112 | len = cp[1]; |
| 113 | if (len < 2) |
| 114 | break; |
| 115 | } |
| 116 | TCHECK2(*cp, len); |
| 117 | switch (tt) { |
| 118 | |
| 119 | case IPOPT_SSRR: |
| 120 | case IPOPT_LSRR: |
| 121 | if (len < 7) |
| 122 | break; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 123 | UNALIGNED_MEMCPY(&retval, cp + len - 4, 4); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 124 | return retval; |
| 125 | } |
| 126 | } |
| 127 | trunc: |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 128 | UNALIGNED_MEMCPY(&retval, &ip->ip_dst.s_addr, sizeof(u_int32_t)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 129 | return retval; |
| 130 | } |
| 131 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 132 | /* |
| 133 | * Compute a V4-style checksum by building a pseudoheader. |
| 134 | */ |
| 135 | int |
| 136 | nextproto4_cksum(const struct ip *ip, const u_int8_t *data, |
| 137 | u_int len, u_int next_proto) |
| 138 | { |
| 139 | struct phdr { |
| 140 | u_int32_t src; |
| 141 | u_int32_t dst; |
| 142 | u_char mbz; |
| 143 | u_char proto; |
| 144 | u_int16_t len; |
| 145 | } ph; |
| 146 | struct cksum_vec vec[2]; |
| 147 | |
| 148 | /* pseudo-header.. */ |
| 149 | ph.len = htons((u_int16_t)len); |
| 150 | ph.mbz = 0; |
| 151 | ph.proto = next_proto; |
| 152 | UNALIGNED_MEMCPY(&ph.src, &ip->ip_src.s_addr, sizeof(u_int32_t)); |
| 153 | if (IP_HL(ip) == 5) |
| 154 | UNALIGNED_MEMCPY(&ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t)); |
| 155 | else |
| 156 | ph.dst = ip_finddst(ip); |
| 157 | |
| 158 | vec[0].ptr = (const u_int8_t *)(void *)&ph; |
| 159 | vec[0].len = sizeof(ph); |
| 160 | vec[1].ptr = data; |
| 161 | vec[1].len = len; |
| 162 | return (in_cksum(vec, 2)); |
| 163 | } |
| 164 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 165 | static void |
| 166 | ip_printts(register const u_char *cp, u_int length) |
| 167 | { |
| 168 | register u_int ptr; |
| 169 | register u_int len; |
| 170 | int hoplen; |
| 171 | const char *type; |
| 172 | |
| 173 | if (length < 4) { |
| 174 | printf("[bad length %u]", length); |
| 175 | return; |
| 176 | } |
| 177 | printf(" TS{"); |
| 178 | hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4; |
| 179 | if ((length - 4) & (hoplen-1)) |
| 180 | printf("[bad length %u]", length); |
| 181 | ptr = cp[2] - 1; |
| 182 | len = 0; |
| 183 | if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1) |
| 184 | printf("[bad ptr %u]", cp[2]); |
| 185 | switch (cp[3]&0xF) { |
| 186 | case IPOPT_TS_TSONLY: |
| 187 | printf("TSONLY"); |
| 188 | break; |
| 189 | case IPOPT_TS_TSANDADDR: |
| 190 | printf("TS+ADDR"); |
| 191 | break; |
| 192 | /* |
| 193 | * prespecified should really be 3, but some ones might send 2 |
| 194 | * instead, and the IPOPT_TS_PRESPEC constant can apparently |
| 195 | * have both values, so we have to hard-code it here. |
| 196 | */ |
| 197 | |
| 198 | case 2: |
| 199 | printf("PRESPEC2.0"); |
| 200 | break; |
| 201 | case 3: /* IPOPT_TS_PRESPEC */ |
| 202 | printf("PRESPEC"); |
| 203 | break; |
| 204 | default: |
| 205 | printf("[bad ts type %d]", cp[3]&0xF); |
| 206 | goto done; |
| 207 | } |
| 208 | |
| 209 | type = " "; |
| 210 | for (len = 4; len < length; len += hoplen) { |
| 211 | if (ptr == len) |
| 212 | type = " ^ "; |
| 213 | printf("%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]), |
| 214 | hoplen!=8 ? "" : ipaddr_string(&cp[len])); |
| 215 | type = " "; |
| 216 | } |
| 217 | |
| 218 | done: |
| 219 | printf("%s", ptr == len ? " ^ " : ""); |
| 220 | |
| 221 | if (cp[3]>>4) |
| 222 | printf(" [%d hops not recorded]} ", cp[3]>>4); |
| 223 | else |
| 224 | printf("}"); |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | * print IP options. |
| 229 | */ |
| 230 | static void |
| 231 | ip_optprint(register const u_char *cp, u_int length) |
| 232 | { |
| 233 | register u_int option_len; |
| 234 | const char *sep = ""; |
| 235 | |
| 236 | for (; length > 0; cp += option_len, length -= option_len) { |
| 237 | u_int option_code; |
| 238 | |
| 239 | printf("%s", sep); |
| 240 | sep = ","; |
| 241 | |
| 242 | TCHECK(*cp); |
| 243 | option_code = *cp; |
| 244 | |
| 245 | printf("%s", |
| 246 | tok2str(ip_option_values,"unknown %u",option_code)); |
| 247 | |
| 248 | if (option_code == IPOPT_NOP || |
| 249 | option_code == IPOPT_EOL) |
| 250 | option_len = 1; |
| 251 | |
| 252 | else { |
| 253 | TCHECK(cp[1]); |
| 254 | option_len = cp[1]; |
| 255 | if (option_len < 2) { |
| 256 | printf(" [bad length %u]", option_len); |
| 257 | return; |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | if (option_len > length) { |
| 262 | printf(" [bad length %u]", option_len); |
| 263 | return; |
| 264 | } |
| 265 | |
| 266 | TCHECK2(*cp, option_len); |
| 267 | |
| 268 | switch (option_code) { |
| 269 | case IPOPT_EOL: |
| 270 | return; |
| 271 | |
| 272 | case IPOPT_TS: |
| 273 | ip_printts(cp, option_len); |
| 274 | break; |
| 275 | |
| 276 | case IPOPT_RR: /* fall through */ |
| 277 | case IPOPT_SSRR: |
| 278 | case IPOPT_LSRR: |
| 279 | ip_printroute(cp, option_len); |
| 280 | break; |
| 281 | |
| 282 | case IPOPT_RA: |
| 283 | if (option_len < 4) { |
| 284 | printf(" [bad length %u]", option_len); |
| 285 | break; |
| 286 | } |
| 287 | TCHECK(cp[3]); |
| 288 | if (EXTRACT_16BITS(&cp[2]) != 0) |
| 289 | printf(" value %u", EXTRACT_16BITS(&cp[2])); |
| 290 | break; |
| 291 | |
| 292 | case IPOPT_NOP: /* nothing to print - fall through */ |
| 293 | case IPOPT_SECURITY: |
| 294 | default: |
| 295 | break; |
| 296 | } |
| 297 | } |
| 298 | return; |
| 299 | |
| 300 | trunc: |
| 301 | printf("[|ip]"); |
| 302 | } |
| 303 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 304 | #define IP_RES 0x8000 |
| 305 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 306 | static const struct tok ip_frag_values[] = { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 307 | { IP_MF, "+" }, |
| 308 | { IP_DF, "DF" }, |
| 309 | { IP_RES, "rsvd" }, /* The RFC3514 evil ;-) bit */ |
| 310 | { 0, NULL } |
| 311 | }; |
| 312 | |
| 313 | struct ip_print_demux_state { |
| 314 | const struct ip *ip; |
| 315 | const u_char *cp; |
| 316 | u_int len, off; |
| 317 | u_char nh; |
| 318 | int advance; |
| 319 | }; |
| 320 | |
| 321 | static void |
| 322 | ip_print_demux(netdissect_options *ndo, |
| 323 | struct ip_print_demux_state *ipds) |
| 324 | { |
| 325 | struct protoent *proto; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 326 | struct cksum_vec vec[1]; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 327 | |
| 328 | again: |
| 329 | switch (ipds->nh) { |
| 330 | |
| 331 | case IPPROTO_AH: |
| 332 | ipds->nh = *ipds->cp; |
| 333 | ipds->advance = ah_print(ipds->cp); |
| 334 | if (ipds->advance <= 0) |
| 335 | break; |
| 336 | ipds->cp += ipds->advance; |
| 337 | ipds->len -= ipds->advance; |
| 338 | goto again; |
| 339 | |
| 340 | case IPPROTO_ESP: |
| 341 | { |
| 342 | int enh, padlen; |
| 343 | ipds->advance = esp_print(ndo, ipds->cp, ipds->len, |
| 344 | (const u_char *)ipds->ip, |
| 345 | &enh, &padlen); |
| 346 | if (ipds->advance <= 0) |
| 347 | break; |
| 348 | ipds->cp += ipds->advance; |
| 349 | ipds->len -= ipds->advance + padlen; |
| 350 | ipds->nh = enh & 0xff; |
| 351 | goto again; |
| 352 | } |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 353 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 354 | case IPPROTO_IPCOMP: |
| 355 | { |
| 356 | int enh; |
| 357 | ipds->advance = ipcomp_print(ipds->cp, &enh); |
| 358 | if (ipds->advance <= 0) |
| 359 | break; |
| 360 | ipds->cp += ipds->advance; |
| 361 | ipds->len -= ipds->advance; |
| 362 | ipds->nh = enh & 0xff; |
| 363 | goto again; |
| 364 | } |
| 365 | |
| 366 | case IPPROTO_SCTP: |
| 367 | sctp_print(ipds->cp, (const u_char *)ipds->ip, ipds->len); |
| 368 | break; |
| 369 | |
| 370 | case IPPROTO_DCCP: |
| 371 | dccp_print(ipds->cp, (const u_char *)ipds->ip, ipds->len); |
| 372 | break; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 373 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 374 | case IPPROTO_TCP: |
| 375 | /* pass on the MF bit plus the offset to detect fragments */ |
| 376 | tcp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip, |
| 377 | ipds->off & (IP_MF|IP_OFFMASK)); |
| 378 | break; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 379 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 380 | case IPPROTO_UDP: |
| 381 | /* pass on the MF bit plus the offset to detect fragments */ |
| 382 | udp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip, |
| 383 | ipds->off & (IP_MF|IP_OFFMASK)); |
| 384 | break; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 385 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 386 | case IPPROTO_ICMP: |
| 387 | /* pass on the MF bit plus the offset to detect fragments */ |
| 388 | icmp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip, |
| 389 | ipds->off & (IP_MF|IP_OFFMASK)); |
| 390 | break; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 391 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 392 | case IPPROTO_PIGP: |
| 393 | /* |
| 394 | * XXX - the current IANA protocol number assignments |
| 395 | * page lists 9 as "any private interior gateway |
| 396 | * (used by Cisco for their IGRP)" and 88 as |
| 397 | * "EIGRP" from Cisco. |
| 398 | * |
| 399 | * Recent BSD <netinet/in.h> headers define |
| 400 | * IP_PROTO_PIGP as 9 and IP_PROTO_IGRP as 88. |
| 401 | * We define IP_PROTO_PIGP as 9 and |
| 402 | * IP_PROTO_EIGRP as 88; those names better |
| 403 | * match was the current protocol number |
| 404 | * assignments say. |
| 405 | */ |
| 406 | igrp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip); |
| 407 | break; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 408 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 409 | case IPPROTO_EIGRP: |
| 410 | eigrp_print(ipds->cp, ipds->len); |
| 411 | break; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 412 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 413 | case IPPROTO_ND: |
| 414 | ND_PRINT((ndo, " nd %d", ipds->len)); |
| 415 | break; |
| 416 | |
| 417 | case IPPROTO_EGP: |
| 418 | egp_print(ipds->cp, ipds->len); |
| 419 | break; |
| 420 | |
| 421 | case IPPROTO_OSPF: |
| 422 | ospf_print(ipds->cp, ipds->len, (const u_char *)ipds->ip); |
| 423 | break; |
| 424 | |
| 425 | case IPPROTO_IGMP: |
| 426 | igmp_print(ipds->cp, ipds->len); |
| 427 | break; |
| 428 | |
| 429 | case IPPROTO_IPV4: |
| 430 | /* DVMRP multicast tunnel (ip-in-ip encapsulation) */ |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 431 | ip_print(ndo, ipds->cp, ipds->len); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 432 | if (! vflag) { |
| 433 | ND_PRINT((ndo, " (ipip-proto-4)")); |
| 434 | return; |
| 435 | } |
| 436 | break; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 437 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 438 | #ifdef INET6 |
| 439 | case IPPROTO_IPV6: |
| 440 | /* ip6-in-ip encapsulation */ |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 441 | ip6_print(ndo, ipds->cp, ipds->len); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 442 | break; |
| 443 | #endif /*INET6*/ |
| 444 | |
| 445 | case IPPROTO_RSVP: |
| 446 | rsvp_print(ipds->cp, ipds->len); |
| 447 | break; |
| 448 | |
| 449 | case IPPROTO_GRE: |
| 450 | /* do it */ |
| 451 | gre_print(ipds->cp, ipds->len); |
| 452 | break; |
| 453 | |
| 454 | case IPPROTO_MOBILE: |
| 455 | mobile_print(ipds->cp, ipds->len); |
| 456 | break; |
| 457 | |
| 458 | case IPPROTO_PIM: |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 459 | vec[0].ptr = ipds->cp; |
| 460 | vec[0].len = ipds->len; |
| 461 | pim_print(ipds->cp, ipds->len, in_cksum(vec, 1)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 462 | break; |
| 463 | |
| 464 | case IPPROTO_VRRP: |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 465 | if (packettype == PT_CARP) { |
| 466 | if (vflag) |
| 467 | (void)printf("carp %s > %s: ", |
| 468 | ipaddr_string(&ipds->ip->ip_src), |
| 469 | ipaddr_string(&ipds->ip->ip_dst)); |
| 470 | carp_print(ipds->cp, ipds->len, ipds->ip->ip_ttl); |
| 471 | } else { |
| 472 | if (vflag) |
| 473 | (void)printf("vrrp %s > %s: ", |
| 474 | ipaddr_string(&ipds->ip->ip_src), |
| 475 | ipaddr_string(&ipds->ip->ip_dst)); |
| 476 | vrrp_print(ipds->cp, ipds->len, ipds->ip->ip_ttl); |
| 477 | } |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 478 | break; |
| 479 | |
| 480 | case IPPROTO_PGM: |
| 481 | pgm_print(ipds->cp, ipds->len, (const u_char *)ipds->ip); |
| 482 | break; |
| 483 | |
| 484 | default: |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 485 | if (ndo->ndo_nflag==0 && (proto = getprotobynumber(ipds->nh)) != NULL) |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 486 | ND_PRINT((ndo, " %s", proto->p_name)); |
| 487 | else |
| 488 | ND_PRINT((ndo, " ip-proto-%d", ipds->nh)); |
| 489 | ND_PRINT((ndo, " %d", ipds->len)); |
| 490 | break; |
| 491 | } |
| 492 | } |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 493 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 494 | void |
| 495 | ip_print_inner(netdissect_options *ndo, |
| 496 | const u_char *bp, |
| 497 | u_int length, u_int nh, |
| 498 | const u_char *bp2) |
| 499 | { |
| 500 | struct ip_print_demux_state ipd; |
| 501 | |
| 502 | ipd.ip = (const struct ip *)bp2; |
| 503 | ipd.cp = bp; |
| 504 | ipd.len = length; |
| 505 | ipd.off = 0; |
| 506 | ipd.nh = nh; |
| 507 | ipd.advance = 0; |
| 508 | |
| 509 | ip_print_demux(ndo, &ipd); |
| 510 | } |
| 511 | |
| 512 | |
| 513 | /* |
| 514 | * print an IP datagram. |
| 515 | */ |
| 516 | void |
| 517 | ip_print(netdissect_options *ndo, |
| 518 | const u_char *bp, |
| 519 | u_int length) |
| 520 | { |
| 521 | struct ip_print_demux_state ipd; |
| 522 | struct ip_print_demux_state *ipds=&ipd; |
| 523 | const u_char *ipend; |
| 524 | u_int hlen; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 525 | struct cksum_vec vec[1]; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 526 | u_int16_t sum, ip_sum; |
| 527 | struct protoent *proto; |
| 528 | |
| 529 | ipds->ip = (const struct ip *)bp; |
| 530 | if (IP_V(ipds->ip) != 4) { /* print version if != 4 */ |
| 531 | printf("IP%u ", IP_V(ipds->ip)); |
| 532 | if (IP_V(ipds->ip) == 6) |
| 533 | printf(", wrong link-layer encapsulation"); |
| 534 | } |
| 535 | else if (!eflag) |
| 536 | printf("IP "); |
| 537 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 538 | if ((u_char *)(ipds->ip + 1) > ndo->ndo_snapend) { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 539 | printf("[|ip]"); |
| 540 | return; |
| 541 | } |
| 542 | if (length < sizeof (struct ip)) { |
| 543 | (void)printf("truncated-ip %u", length); |
| 544 | return; |
| 545 | } |
| 546 | hlen = IP_HL(ipds->ip) * 4; |
| 547 | if (hlen < sizeof (struct ip)) { |
| 548 | (void)printf("bad-hlen %u", hlen); |
| 549 | return; |
| 550 | } |
| 551 | |
| 552 | ipds->len = EXTRACT_16BITS(&ipds->ip->ip_len); |
| 553 | if (length < ipds->len) |
| 554 | (void)printf("truncated-ip - %u bytes missing! ", |
| 555 | ipds->len - length); |
| 556 | if (ipds->len < hlen) { |
| 557 | #ifdef GUESS_TSO |
| 558 | if (ipds->len) { |
| 559 | (void)printf("bad-len %u", ipds->len); |
| 560 | return; |
| 561 | } |
| 562 | else { |
| 563 | /* we guess that it is a TSO send */ |
| 564 | ipds->len = length; |
| 565 | } |
| 566 | #else |
| 567 | (void)printf("bad-len %u", ipds->len); |
| 568 | return; |
| 569 | #endif /* GUESS_TSO */ |
| 570 | } |
| 571 | |
| 572 | /* |
| 573 | * Cut off the snapshot length to the end of the IP payload. |
| 574 | */ |
| 575 | ipend = bp + ipds->len; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 576 | if (ipend < ndo->ndo_snapend) |
| 577 | ndo->ndo_snapend = ipend; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 578 | |
| 579 | ipds->len -= hlen; |
| 580 | |
| 581 | ipds->off = EXTRACT_16BITS(&ipds->ip->ip_off); |
| 582 | |
| 583 | if (vflag) { |
| 584 | (void)printf("(tos 0x%x", (int)ipds->ip->ip_tos); |
| 585 | /* ECN bits */ |
| 586 | if (ipds->ip->ip_tos & 0x03) { |
| 587 | switch (ipds->ip->ip_tos & 0x03) { |
| 588 | case 1: |
| 589 | (void)printf(",ECT(1)"); |
| 590 | break; |
| 591 | case 2: |
| 592 | (void)printf(",ECT(0)"); |
| 593 | break; |
| 594 | case 3: |
| 595 | (void)printf(",CE"); |
| 596 | } |
| 597 | } |
| 598 | |
| 599 | if (ipds->ip->ip_ttl >= 1) |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 600 | (void)printf(", ttl %u", ipds->ip->ip_ttl); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 601 | |
| 602 | /* |
| 603 | * for the firewall guys, print id, offset. |
| 604 | * On all but the last stick a "+" in the flags portion. |
| 605 | * For unfragmented datagrams, note the don't fragment flag. |
| 606 | */ |
| 607 | |
| 608 | (void)printf(", id %u, offset %u, flags [%s], proto %s (%u)", |
| 609 | EXTRACT_16BITS(&ipds->ip->ip_id), |
| 610 | (ipds->off & 0x1fff) * 8, |
| 611 | bittok2str(ip_frag_values, "none", ipds->off&0xe000), |
| 612 | tok2str(ipproto_values,"unknown",ipds->ip->ip_p), |
| 613 | ipds->ip->ip_p); |
| 614 | |
| 615 | (void)printf(", length %u", EXTRACT_16BITS(&ipds->ip->ip_len)); |
| 616 | |
| 617 | if ((hlen - sizeof(struct ip)) > 0) { |
| 618 | printf(", options ("); |
| 619 | ip_optprint((u_char *)(ipds->ip + 1), hlen - sizeof(struct ip)); |
| 620 | printf(")"); |
| 621 | } |
| 622 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 623 | if (!Kflag && (u_char *)ipds->ip + hlen <= ndo->ndo_snapend) { |
| 624 | vec[0].ptr = (const u_int8_t *)(void *)ipds->ip; |
| 625 | vec[0].len = hlen; |
| 626 | sum = in_cksum(vec, 1); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 627 | if (sum != 0) { |
| 628 | ip_sum = EXTRACT_16BITS(&ipds->ip->ip_sum); |
| 629 | (void)printf(", bad cksum %x (->%x)!", ip_sum, |
| 630 | in_cksum_shouldbe(ip_sum, sum)); |
| 631 | } |
| 632 | } |
| 633 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 634 | printf(")\n "); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 635 | } |
| 636 | |
| 637 | /* |
| 638 | * If this is fragment zero, hand it to the next higher |
| 639 | * level protocol. |
| 640 | */ |
| 641 | if ((ipds->off & 0x1fff) == 0) { |
| 642 | ipds->cp = (const u_char *)ipds->ip + hlen; |
| 643 | ipds->nh = ipds->ip->ip_p; |
| 644 | |
| 645 | if (ipds->nh != IPPROTO_TCP && ipds->nh != IPPROTO_UDP && |
| 646 | ipds->nh != IPPROTO_SCTP && ipds->nh != IPPROTO_DCCP) { |
| 647 | (void)printf("%s > %s: ", |
| 648 | ipaddr_string(&ipds->ip->ip_src), |
| 649 | ipaddr_string(&ipds->ip->ip_dst)); |
| 650 | } |
| 651 | ip_print_demux(ndo, ipds); |
| 652 | } else { |
| 653 | /* Ultra quiet now means that all this stuff should be suppressed */ |
| 654 | if (qflag > 1) return; |
| 655 | |
| 656 | /* |
| 657 | * if this isn't the first frag, we're missing the |
| 658 | * next level protocol header. print the ip addr |
| 659 | * and the protocol. |
| 660 | */ |
| 661 | if (ipds->off & 0x1fff) { |
| 662 | (void)printf("%s > %s:", ipaddr_string(&ipds->ip->ip_src), |
| 663 | ipaddr_string(&ipds->ip->ip_dst)); |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 664 | if (!ndo->ndo_nflag && (proto = getprotobynumber(ipds->ip->ip_p)) != NULL) |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 665 | (void)printf(" %s", proto->p_name); |
| 666 | else |
| 667 | (void)printf(" ip-proto-%d", ipds->ip->ip_p); |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 668 | } |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 669 | } |
| 670 | } |
| 671 | |
| 672 | void |
| 673 | ipN_print(register const u_char *bp, register u_int length) |
| 674 | { |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 675 | struct ip hdr; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 676 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 677 | if (length < 4) { |
| 678 | (void)printf("truncated-ip %d", length); |
| 679 | return; |
| 680 | } |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 681 | memcpy (&hdr, bp, 4); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 682 | switch (IP_V(&hdr)) { |
| 683 | case 4: |
| 684 | ip_print (gndo, bp, length); |
| 685 | return; |
| 686 | #ifdef INET6 |
| 687 | case 6: |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 688 | ip6_print (gndo, bp, length); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 689 | return; |
| 690 | #endif |
| 691 | default: |
| 692 | (void)printf("unknown ip %d", IP_V(&hdr)); |
| 693 | return; |
| 694 | } |
| 695 | } |
| 696 | |
| 697 | /* |
| 698 | * Local Variables: |
| 699 | * c-style: whitesmith |
| 700 | * c-basic-offset: 8 |
| 701 | * End: |
| 702 | */ |
| 703 | |
| 704 | |