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 |
| 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-ip6.c,v 1.52 2007-09-21 07:05:33 hannes Exp $"; |
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 | #ifdef INET6 |
| 32 | |
| 33 | #include <tcpdump-stdinc.h> |
| 34 | |
| 35 | #include <stdio.h> |
| 36 | #include <stdlib.h> |
| 37 | #include <string.h> |
| 38 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 39 | #include "netdissect.h" |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 40 | #include "interface.h" |
| 41 | #include "addrtoname.h" |
| 42 | #include "extract.h" |
| 43 | |
| 44 | #include "ip6.h" |
| 45 | #include "ipproto.h" |
| 46 | |
| 47 | /* |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 48 | * Compute a V6-style checksum by building a pseudoheader. |
| 49 | */ |
| 50 | int |
| 51 | nextproto6_cksum(const struct ip6_hdr *ip6, const u_int8_t *data, |
| 52 | u_int len, u_int next_proto) |
| 53 | { |
| 54 | struct { |
| 55 | struct in6_addr ph_src; |
| 56 | struct in6_addr ph_dst; |
| 57 | u_int32_t ph_len; |
| 58 | u_int8_t ph_zero[3]; |
| 59 | u_int8_t ph_nxt; |
| 60 | } ph; |
| 61 | struct cksum_vec vec[2]; |
| 62 | |
| 63 | /* pseudo-header */ |
| 64 | memset(&ph, 0, sizeof(ph)); |
| 65 | UNALIGNED_MEMCPY(&ph.ph_src, &ip6->ip6_src, sizeof (struct in6_addr)); |
| 66 | UNALIGNED_MEMCPY(&ph.ph_dst, &ip6->ip6_dst, sizeof (struct in6_addr)); |
| 67 | ph.ph_len = htonl(len); |
| 68 | ph.ph_nxt = next_proto; |
| 69 | |
| 70 | vec[0].ptr = (const u_int8_t *)(void *)&ph; |
| 71 | vec[0].len = sizeof(ph); |
| 72 | vec[1].ptr = data; |
| 73 | vec[1].len = len; |
| 74 | |
| 75 | return in_cksum(vec, 2); |
| 76 | } |
| 77 | |
| 78 | /* |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 79 | * print an IP6 datagram. |
| 80 | */ |
| 81 | void |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 82 | ip6_print(netdissect_options *ndo, const u_char *bp, u_int length) |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 83 | { |
| 84 | register const struct ip6_hdr *ip6; |
| 85 | register int advance; |
| 86 | u_int len; |
| 87 | const u_char *ipend; |
| 88 | register const u_char *cp; |
| 89 | register u_int payload_len; |
| 90 | int nh; |
| 91 | int fragmented = 0; |
| 92 | u_int flow; |
| 93 | |
| 94 | ip6 = (const struct ip6_hdr *)bp; |
| 95 | |
| 96 | TCHECK(*ip6); |
| 97 | if (length < sizeof (struct ip6_hdr)) { |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 98 | (void)ND_PRINT((ndo, "truncated-ip6 %u", length)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 99 | return; |
| 100 | } |
| 101 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 102 | if (!ndo->ndo_eflag) |
| 103 | ND_PRINT((ndo, "IP6 ")); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 104 | |
| 105 | payload_len = EXTRACT_16BITS(&ip6->ip6_plen); |
| 106 | len = payload_len + sizeof(struct ip6_hdr); |
| 107 | if (length < len) |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 108 | (void)ND_PRINT((ndo, "truncated-ip6 - %u bytes missing!", |
| 109 | len - length)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 110 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 111 | if (ndo->ndo_vflag) { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 112 | flow = EXTRACT_32BITS(&ip6->ip6_flow); |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 113 | ND_PRINT((ndo, "(")); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 114 | #if 0 |
| 115 | /* rfc1883 */ |
| 116 | if (flow & 0x0f000000) |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 117 | (void)ND_PRINT((ndo, "pri 0x%02x, ", (flow & 0x0f000000) >> 24)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 118 | if (flow & 0x00ffffff) |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 119 | (void)ND_PRINT((ndo, "flowlabel 0x%06x, ", flow & 0x00ffffff)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 120 | #else |
| 121 | /* RFC 2460 */ |
| 122 | if (flow & 0x0ff00000) |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 123 | (void)ND_PRINT((ndo, "class 0x%02x, ", (flow & 0x0ff00000) >> 20)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 124 | if (flow & 0x000fffff) |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 125 | (void)ND_PRINT((ndo, "flowlabel 0x%05x, ", flow & 0x000fffff)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 126 | #endif |
| 127 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 128 | (void)ND_PRINT((ndo, "hlim %u, next-header %s (%u) payload length: %u) ", |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 129 | ip6->ip6_hlim, |
| 130 | tok2str(ipproto_values,"unknown",ip6->ip6_nxt), |
| 131 | ip6->ip6_nxt, |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 132 | payload_len)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 133 | } |
| 134 | |
| 135 | /* |
| 136 | * Cut off the snapshot length to the end of the IP payload. |
| 137 | */ |
| 138 | ipend = bp + len; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 139 | if (ipend < ndo->ndo_snapend) |
| 140 | ndo->ndo_snapend = ipend; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 141 | |
| 142 | cp = (const u_char *)ip6; |
| 143 | advance = sizeof(struct ip6_hdr); |
| 144 | nh = ip6->ip6_nxt; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 145 | while (cp < ndo->ndo_snapend && advance > 0) { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 146 | cp += advance; |
| 147 | len -= advance; |
| 148 | |
| 149 | if (cp == (const u_char *)(ip6 + 1) && |
| 150 | nh != IPPROTO_TCP && nh != IPPROTO_UDP && |
| 151 | nh != IPPROTO_DCCP && nh != IPPROTO_SCTP) { |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 152 | (void)ND_PRINT((ndo, "%s > %s: ", ip6addr_string(&ip6->ip6_src), |
| 153 | ip6addr_string(&ip6->ip6_dst))); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | switch (nh) { |
| 157 | case IPPROTO_HOPOPTS: |
| 158 | advance = hbhopt_print(cp); |
| 159 | nh = *cp; |
| 160 | break; |
| 161 | case IPPROTO_DSTOPTS: |
| 162 | advance = dstopt_print(cp); |
| 163 | nh = *cp; |
| 164 | break; |
| 165 | case IPPROTO_FRAGMENT: |
| 166 | advance = frag6_print(cp, (const u_char *)ip6); |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 167 | if (ndo->ndo_snapend <= cp + advance) |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 168 | return; |
| 169 | nh = *cp; |
| 170 | fragmented = 1; |
| 171 | break; |
| 172 | |
| 173 | case IPPROTO_MOBILITY_OLD: |
| 174 | case IPPROTO_MOBILITY: |
| 175 | /* |
| 176 | * XXX - we don't use "advance"; the current |
| 177 | * "Mobility Support in IPv6" draft |
| 178 | * (draft-ietf-mobileip-ipv6-24) says that |
| 179 | * the next header field in a mobility header |
| 180 | * should be IPPROTO_NONE, but speaks of |
| 181 | * the possiblity of a future extension in |
| 182 | * which payload can be piggybacked atop a |
| 183 | * mobility header. |
| 184 | */ |
| 185 | advance = mobility_print(cp, (const u_char *)ip6); |
| 186 | nh = *cp; |
| 187 | return; |
| 188 | case IPPROTO_ROUTING: |
| 189 | advance = rt6_print(cp, (const u_char *)ip6); |
| 190 | nh = *cp; |
| 191 | break; |
| 192 | case IPPROTO_SCTP: |
| 193 | sctp_print(cp, (const u_char *)ip6, len); |
| 194 | return; |
| 195 | case IPPROTO_DCCP: |
| 196 | dccp_print(cp, (const u_char *)ip6, len); |
| 197 | return; |
| 198 | case IPPROTO_TCP: |
| 199 | tcp_print(cp, len, (const u_char *)ip6, fragmented); |
| 200 | return; |
| 201 | case IPPROTO_UDP: |
| 202 | udp_print(cp, len, (const u_char *)ip6, fragmented); |
| 203 | return; |
| 204 | case IPPROTO_ICMPV6: |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 205 | icmp6_print(ndo, cp, len, (const u_char *)ip6, fragmented); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 206 | return; |
| 207 | case IPPROTO_AH: |
| 208 | advance = ah_print(cp); |
| 209 | nh = *cp; |
| 210 | break; |
| 211 | case IPPROTO_ESP: |
| 212 | { |
| 213 | int enh, padlen; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 214 | advance = esp_print(ndo, cp, len, (const u_char *)ip6, &enh, &padlen); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 215 | nh = enh & 0xff; |
| 216 | len -= padlen; |
| 217 | break; |
| 218 | } |
| 219 | case IPPROTO_IPCOMP: |
| 220 | { |
| 221 | int enh; |
| 222 | advance = ipcomp_print(cp, &enh); |
| 223 | nh = enh & 0xff; |
| 224 | break; |
| 225 | } |
| 226 | |
| 227 | case IPPROTO_PIM: |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 228 | pim_print(cp, len, nextproto6_cksum(ip6, cp, len, |
| 229 | IPPROTO_PIM)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 230 | return; |
| 231 | |
| 232 | case IPPROTO_OSPF: |
| 233 | ospf6_print(cp, len); |
| 234 | return; |
| 235 | |
| 236 | case IPPROTO_IPV6: |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 237 | ip6_print(ndo, cp, len); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 238 | return; |
| 239 | |
| 240 | case IPPROTO_IPV4: |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 241 | ip_print(ndo, cp, len); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 242 | return; |
| 243 | |
| 244 | case IPPROTO_PGM: |
| 245 | pgm_print(cp, len, (const u_char *)ip6); |
| 246 | return; |
| 247 | |
| 248 | case IPPROTO_GRE: |
| 249 | gre_print(cp, len); |
| 250 | return; |
| 251 | |
| 252 | case IPPROTO_RSVP: |
| 253 | rsvp_print(cp, len); |
| 254 | return; |
| 255 | |
| 256 | case IPPROTO_NONE: |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 257 | (void)ND_PRINT((ndo, "no next header")); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 258 | return; |
| 259 | |
| 260 | default: |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 261 | (void)ND_PRINT((ndo, "ip-proto-%d %d", nh, len)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 262 | return; |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | return; |
| 267 | trunc: |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 268 | (void)ND_PRINT((ndo, "[|ip6]")); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 269 | } |
| 270 | |
| 271 | #endif /* INET6 */ |