| 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_ = |
| 24 | "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.47.2.3 2005/09/20 06:05:38 guy Exp $"; |
| 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 | |
| 39 | #include "interface.h" |
| 40 | #include "addrtoname.h" |
| 41 | #include "extract.h" |
| 42 | |
| 43 | #include "ip6.h" |
| 44 | #include "ipproto.h" |
| 45 | |
| 46 | /* |
| 47 | * print an IP6 datagram. |
| 48 | */ |
| 49 | void |
| 50 | ip6_print(register const u_char *bp, register u_int length) |
| 51 | { |
| 52 | register const struct ip6_hdr *ip6; |
| 53 | register int advance; |
| 54 | u_int len; |
| 55 | const u_char *ipend; |
| 56 | register const u_char *cp; |
| 57 | register u_int payload_len; |
| 58 | int nh; |
| 59 | int fragmented = 0; |
| 60 | u_int flow; |
| 61 | |
| 62 | ip6 = (const struct ip6_hdr *)bp; |
| 63 | |
| 64 | TCHECK(*ip6); |
| 65 | if (length < sizeof (struct ip6_hdr)) { |
| 66 | (void)printf("truncated-ip6 %u", length); |
| 67 | return; |
| 68 | } |
| 69 | |
| 70 | if (!eflag) |
| 71 | printf("IP6 "); |
| 72 | |
| 73 | payload_len = EXTRACT_16BITS(&ip6->ip6_plen); |
| 74 | len = payload_len + sizeof(struct ip6_hdr); |
| 75 | if (length < len) |
| 76 | (void)printf("truncated-ip6 - %u bytes missing!", |
| 77 | len - length); |
| 78 | |
| 79 | if (vflag) { |
| 80 | flow = EXTRACT_32BITS(&ip6->ip6_flow); |
| 81 | printf("("); |
| 82 | #if 0 |
| 83 | /* rfc1883 */ |
| 84 | if (flow & 0x0f000000) |
| 85 | (void)printf("pri 0x%02x, ", (flow & 0x0f000000) >> 24); |
| 86 | if (flow & 0x00ffffff) |
| 87 | (void)printf("flowlabel 0x%06x, ", flow & 0x00ffffff); |
| 88 | #else |
| 89 | /* RFC 2460 */ |
| 90 | if (flow & 0x0ff00000) |
| 91 | (void)printf("class 0x%02x, ", (flow & 0x0ff00000) >> 20); |
| 92 | if (flow & 0x000fffff) |
| 93 | (void)printf("flowlabel 0x%05x, ", flow & 0x000fffff); |
| 94 | #endif |
| 95 | |
| 96 | (void)printf("hlim %u, next-header: %s (%u), length: %u) ", |
| 97 | ip6->ip6_hlim, |
| 98 | tok2str(ipproto_values,"unknown",ip6->ip6_nxt), |
| 99 | ip6->ip6_nxt, |
| 100 | payload_len); |
| 101 | } |
| 102 | |
| 103 | /* |
| 104 | * Cut off the snapshot length to the end of the IP payload. |
| 105 | */ |
| 106 | ipend = bp + len; |
| 107 | if (ipend < snapend) |
| 108 | snapend = ipend; |
| 109 | |
| 110 | cp = (const u_char *)ip6; |
| 111 | advance = sizeof(struct ip6_hdr); |
| 112 | nh = ip6->ip6_nxt; |
| 113 | while (cp < snapend && advance > 0) { |
| 114 | cp += advance; |
| 115 | len -= advance; |
| 116 | |
| 117 | if (cp == (const u_char *)(ip6 + 1) && |
| 118 | nh != IPPROTO_TCP && nh != IPPROTO_UDP && |
| 119 | nh != IPPROTO_DCCP && nh != IPPROTO_SCTP) { |
| 120 | (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src), |
| 121 | ip6addr_string(&ip6->ip6_dst)); |
| 122 | } |
| 123 | |
| 124 | switch (nh) { |
| 125 | case IPPROTO_HOPOPTS: |
| 126 | advance = hbhopt_print(cp); |
| 127 | nh = *cp; |
| 128 | break; |
| 129 | case IPPROTO_DSTOPTS: |
| 130 | advance = dstopt_print(cp); |
| 131 | nh = *cp; |
| 132 | break; |
| 133 | case IPPROTO_FRAGMENT: |
| 134 | advance = frag6_print(cp, (const u_char *)ip6); |
| 135 | if (snapend <= cp + advance) |
| 136 | return; |
| 137 | nh = *cp; |
| 138 | fragmented = 1; |
| 139 | break; |
| 140 | |
| 141 | case IPPROTO_MOBILITY_OLD: |
| 142 | case IPPROTO_MOBILITY: |
| 143 | /* |
| 144 | * XXX - we don't use "advance"; the current |
| 145 | * "Mobility Support in IPv6" draft |
| 146 | * (draft-ietf-mobileip-ipv6-24) says that |
| 147 | * the next header field in a mobility header |
| 148 | * should be IPPROTO_NONE, but speaks of |
| 149 | * the possiblity of a future extension in |
| 150 | * which payload can be piggybacked atop a |
| 151 | * mobility header. |
| 152 | */ |
| 153 | advance = mobility_print(cp, (const u_char *)ip6); |
| 154 | nh = *cp; |
| 155 | return; |
| 156 | case IPPROTO_ROUTING: |
| 157 | advance = rt6_print(cp, (const u_char *)ip6); |
| 158 | nh = *cp; |
| 159 | break; |
| 160 | case IPPROTO_SCTP: |
| 161 | sctp_print(cp, (const u_char *)ip6, len); |
| 162 | return; |
| 163 | case IPPROTO_DCCP: |
| 164 | dccp_print(cp, (const u_char *)ip6, len); |
| 165 | return; |
| 166 | case IPPROTO_TCP: |
| 167 | tcp_print(cp, len, (const u_char *)ip6, fragmented); |
| 168 | return; |
| 169 | case IPPROTO_UDP: |
| 170 | udp_print(cp, len, (const u_char *)ip6, fragmented); |
| 171 | return; |
| 172 | case IPPROTO_ICMPV6: |
| 173 | icmp6_print(cp, len, (const u_char *)ip6, fragmented); |
| 174 | return; |
| 175 | case IPPROTO_AH: |
| 176 | advance = ah_print(cp); |
| 177 | nh = *cp; |
| 178 | break; |
| 179 | case IPPROTO_ESP: |
| 180 | { |
| 181 | int enh, padlen; |
| 182 | advance = esp_print(gndo, cp, len, (const u_char *)ip6, &enh, &padlen); |
| 183 | nh = enh & 0xff; |
| 184 | len -= padlen; |
| 185 | break; |
| 186 | } |
| 187 | case IPPROTO_IPCOMP: |
| 188 | { |
| 189 | int enh; |
| 190 | advance = ipcomp_print(cp, &enh); |
| 191 | nh = enh & 0xff; |
| 192 | break; |
| 193 | } |
| 194 | |
| 195 | case IPPROTO_PIM: |
| 196 | pim_print(cp, len); |
| 197 | return; |
| 198 | |
| 199 | case IPPROTO_OSPF: |
| 200 | ospf6_print(cp, len); |
| 201 | return; |
| 202 | |
| 203 | case IPPROTO_IPV6: |
| 204 | ip6_print(cp, len); |
| 205 | return; |
| 206 | |
| 207 | case IPPROTO_IPV4: |
| 208 | ip_print(gndo, cp, len); |
| 209 | return; |
| 210 | |
| 211 | case IPPROTO_PGM: |
| 212 | pgm_print(cp, len, (const u_char *)ip6); |
| 213 | return; |
| 214 | |
| 215 | case IPPROTO_GRE: |
| 216 | gre_print(cp, len); |
| 217 | return; |
| 218 | |
| 219 | case IPPROTO_RSVP: |
| 220 | rsvp_print(cp, len); |
| 221 | return; |
| 222 | |
| 223 | case IPPROTO_NONE: |
| 224 | (void)printf("no next header"); |
| 225 | return; |
| 226 | |
| 227 | default: |
| 228 | (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len); |
| 229 | return; |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | return; |
| 234 | trunc: |
| 235 | (void)printf("[|ip6]"); |
| 236 | } |
| 237 | |
| 238 | #endif /* INET6 */ |