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  * $FreeBSD$
  22  */
  23
  24 #ifndef lint
  25 static const char rcsid[] _U_ =
  26     "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.52 2007-09-21 07:05:33 hannes Exp $";
  27 #endif
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include "config.h"
  31 #endif
  32
  33 #ifdef INET6
  34
  35 #include <tcpdump-stdinc.h>
  36
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40
  41 #include "interface.h"
  42 #include "addrtoname.h"
  43 #include "extract.h"
  44
  45 #include "ip6.h"
  46 #include "ipproto.h"
  47
  48 /*
  49  * print an IP6 datagram.
  50  */
  51 void
  52 ip6_print(register const u_char *bp, register u_int length)
  53 {
  54         register const struct ip6_hdr *ip6;
  55         register int advance;
  56         u_int len;
  57         const u_char *ipend;
  58         register const u_char *cp;
  59         register u_int payload_len;
  60         int nh;
  61         int fragmented = 0;
  62         u_int flow;
  63
  64         ip6 = (const struct ip6_hdr *)bp;
  65
  66         TCHECK(*ip6);
  67         if (length < sizeof (struct ip6_hdr)) {
  68                 (void)printf("truncated-ip6 %u", length);
  69                 return;
  70         }
  71
  72         if (!eflag)
  73             printf("IP6 ");
  74
  75         payload_len = EXTRACT_16BITS(&ip6->ip6_plen);
  76         len = payload_len + sizeof(struct ip6_hdr);
  77         if (length < len)
  78                 (void)printf("truncated-ip6 - %u bytes missing!",
  79                         len - length);
  80
  81         if (vflag) {
  82             flow = EXTRACT_32BITS(&ip6->ip6_flow);
  83             printf("(");
  84 #if 0
  85             /* rfc1883 */
  86             if (flow & 0x0f000000)
  87                 (void)printf("pri 0x%02x, ", (flow & 0x0f000000) >> 24);
  88             if (flow & 0x00ffffff)
  89                 (void)printf("flowlabel 0x%06x, ", flow & 0x00ffffff);
  90 #else
  91             /* RFC 2460 */
  92             if (flow & 0x0ff00000)
  93                 (void)printf("class 0x%02x, ", (flow & 0x0ff00000) >> 20);
  94             if (flow & 0x000fffff)
  95                 (void)printf("flowlabel 0x%05x, ", flow & 0x000fffff);
  96 #endif
  97
  98             (void)printf("hlim %u, next-header %s (%u) payload length: %u) ",
  99                          ip6->ip6_hlim,
 100                          tok2str(ipproto_values,"unknown",ip6->ip6_nxt),
 101                          ip6->ip6_nxt,
 102                          payload_len);
 103         }
 104
 105         /*
 106          * Cut off the snapshot length to the end of the IP payload.
 107          */
 108         ipend = bp + len;
 109         if (ipend < snapend)
 110                 snapend = ipend;
 111
 112         cp = (const u_char *)ip6;
 113         advance = sizeof(struct ip6_hdr);
 114         nh = ip6->ip6_nxt;
 115         while (cp < snapend && advance > 0) {
 116                 cp += advance;
 117                 len -= advance;
 118
 119                 if (cp == (const u_char *)(ip6 + 1) &&
 120                     nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
 121                     nh != IPPROTO_DCCP && nh != IPPROTO_SCTP) {
 122                         (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
 123                                      ip6addr_string(&ip6->ip6_dst));
 124                 }
 125
 126                 switch (nh) {
 127                 case IPPROTO_HOPOPTS:
 128                         advance = hbhopt_print(cp);
 129                         nh = *cp;
 130                         break;
 131                 case IPPROTO_DSTOPTS:
 132                         advance = dstopt_print(cp);
 133                         nh = *cp;
 134                         break;
 135                 case IPPROTO_FRAGMENT:
 136                         advance = frag6_print(cp, (const u_char *)ip6);
 137                         if (snapend <= cp + advance)
 138                                 return;
 139                         nh = *cp;
 140                         fragmented = 1;
 141                         break;
 142
 143                 case IPPROTO_MOBILITY_OLD:
 144                 case IPPROTO_MOBILITY:
 145                         /*
 146                          * XXX - we don't use "advance"; the current
 147                          * "Mobility Support in IPv6" draft
 148                          * (draft-ietf-mobileip-ipv6-24) says that
 149                          * the next header field in a mobility header
 150                          * should be IPPROTO_NONE, but speaks of
 151                          * the possiblity of a future extension in
 152                          * which payload can be piggybacked atop a
 153                          * mobility header.
 154                          */
 155                         advance = mobility_print(cp, (const u_char *)ip6);
 156                         nh = *cp;
 157                         return;
 158                 case IPPROTO_ROUTING:
 159                         advance = rt6_print(cp, (const u_char *)ip6);
 160                         nh = *cp;
 161                         break;
 162                 case IPPROTO_SCTP:
 163                         sctp_print(cp, (const u_char *)ip6, len);
 164                         return;
 165                 case IPPROTO_DCCP:
 166                         dccp_print(cp, (const u_char *)ip6, len);
 167                         return;
 168                 case IPPROTO_TCP:
 169                         tcp_print(cp, len, (const u_char *)ip6, fragmented);
 170                         return;
 171                 case IPPROTO_UDP:
 172                         udp_print(cp, len, (const u_char *)ip6, fragmented);
 173                         return;
 174                 case IPPROTO_ICMPV6:
 175                         icmp6_print(cp, len, (const u_char *)ip6, fragmented);
 176                         return;
 177                 case IPPROTO_AH:
 178                         advance = ah_print(cp);
 179                         nh = *cp;
 180                         break;
 181                 case IPPROTO_ESP:
 182                     {
 183                         int enh, padlen;
 184                         advance = esp_print(gndo, cp, len, (const u_char *)ip6, &enh, &padlen);
 185                         nh = enh & 0xff;
 186                         len -= padlen;
 187                         break;
 188                     }
 189                 case IPPROTO_IPCOMP:
 190                     {
 191                         int enh;
 192                         advance = ipcomp_print(cp, &enh);
 193                         nh = enh & 0xff;
 194                         break;
 195                     }
 196
 197                 case IPPROTO_PIM:
 198                         pim_print(cp, len);
 199                         return;
 200
 201                 case IPPROTO_OSPF:
 202                         ospf6_print(cp, len);
 203                         return;
 204
 205                 case IPPROTO_IPV6:
 206                         ip6_print(cp, len);
 207                         return;
 208
 209                 case IPPROTO_IPV4:
 210                         ip_print(gndo, cp, len);
 211                         return;
 212
 213                 case IPPROTO_PGM:
 214                         pgm_print(cp, len, (const u_char *)ip6);
 215                         return;
 216
 217                 case IPPROTO_GRE:
 218                         gre_print(cp, len);
 219                         return;
 220
 221                 case IPPROTO_RSVP:
 222                         rsvp_print(cp, len);
 223                         return;
 224
 225                 case IPPROTO_NONE:
 226                         (void)printf("no next header");
 227                         return;
 228
 229                 default:
 230                         (void)printf("ip-proto-%d %d", nh, len);
 231                         return;
 232                 }
 233         }
 234
 235         return;
 236 trunc:
 237         (void)printf("[|ip6]");
 238 }
 239
 240 #endif /* INET6 */