contrib/tcpdump/print-ip6.c

   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 1.52 2007-09-21 07:05:33 hannes 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) payload 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", nh, len);
 229                         return;
 230                 }
 231         }
 232
 233         return;
 234 trunc:
 235         (void)printf("[|ip6]");
 236 }
 237
 238 #endif /* INET6 */