The Tcpdump Group git mirrors - tcpdump/blob - 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 1.32.2.9 2004-08-27 03:56:22 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         payload_len = EXTRACT_16BITS(&ip6->ip6_plen);
  71         len = payload_len + sizeof(struct ip6_hdr);
  72         if (length < len)
  73                 (void)printf("truncated-ip6 - %u bytes missing!",
  74                         len - length);
  75
  76         /*
  77          * Cut off the snapshot length to the end of the IP payload.
  78          */
  79         ipend = bp + len;
  80         if (ipend < snapend)
  81                 snapend = ipend;
  82
  83         cp = (const u_char *)ip6;
  84         advance = sizeof(struct ip6_hdr);
  85         nh = ip6->ip6_nxt;
  86         while (cp < snapend && advance > 0) {
  87                 cp += advance;
  88                 len -= advance;
  89
  90                 if (cp == (const u_char *)(ip6 + 1) &&
  91                     nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
  92                     nh != IPPROTO_SCTP) {
  93                         (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
  94                                      ip6addr_string(&ip6->ip6_dst));
  95                 }
  96
  97                 switch (nh) {
  98                 case IPPROTO_HOPOPTS:
  99                         advance = hbhopt_print(cp);
 100                         nh = *cp;
 101                         break;
 102                 case IPPROTO_DSTOPTS:
 103                         advance = dstopt_print(cp);
 104                         nh = *cp;
 105                         break;
 106                 case IPPROTO_FRAGMENT:
 107                         advance = frag6_print(cp, (const u_char *)ip6);
 108                         if (snapend <= cp + advance)
 109                                 goto end;
 110                         nh = *cp;
 111                         fragmented = 1;
 112                         break;
 113
 114                 case IPPROTO_MOBILITY_OLD:
 115                 case IPPROTO_MOBILITY:
 116                         /*
 117                          * XXX - we don't use "advance"; the current
 118                          * "Mobility Support in IPv6" draft
 119                          * (draft-ietf-mobileip-ipv6-24) says that
 120                          * the next header field in a mobility header
 121                          * should be IPPROTO_NONE, but speaks of
 122                          * the possiblity of a future extension in
 123                          * which payload can be piggybacked atop a
 124                          * mobility header.
 125                          */
 126                         advance = mobility_print(cp, (const u_char *)ip6);
 127                         nh = *cp;
 128                         goto end;
 129                 case IPPROTO_ROUTING:
 130                         advance = rt6_print(cp, (const u_char *)ip6);
 131                         nh = *cp;
 132                         break;
 133                 case IPPROTO_SCTP:
 134                         sctp_print(cp, (const u_char *)ip6, len);
 135                         goto end;
 136                 case IPPROTO_TCP:
 137                         tcp_print(cp, len, (const u_char *)ip6, fragmented);
 138                         goto end;
 139                 case IPPROTO_UDP:
 140                         udp_print(cp, len, (const u_char *)ip6, fragmented);
 141                         goto end;
 142                 case IPPROTO_ICMPV6:
 143                         icmp6_print(cp, len, (const u_char *)ip6, fragmented);
 144                         goto end;
 145                 case IPPROTO_AH:
 146                         advance = ah_print(cp);
 147                         nh = *cp;
 148                         break;
 149                 case IPPROTO_ESP:
 150                     {
 151                         int enh, padlen;
 152                         advance = esp_print(cp, (const u_char *)ip6, &enh, &padlen);
 153                         nh = enh & 0xff;
 154                         len -= padlen;
 155                         break;
 156                     }
 157                 case IPPROTO_IPCOMP:
 158                     {
 159                         int enh;
 160                         advance = ipcomp_print(cp, &enh);
 161                         nh = enh & 0xff;
 162                         break;
 163                     }
 164
 165                 case IPPROTO_PIM:
 166                         pim_print(cp, len);
 167                         goto end;
 168                 case IPPROTO_OSPF:
 169                         ospf6_print(cp, len);
 170                         goto end;
 171
 172                 case IPPROTO_IPV6:
 173                         ip6_print(cp, len);
 174                         goto end;
 175
 176                 case IPPROTO_IPV4:
 177                         ip_print(cp, len);
 178                         goto end;
 179
 180                 case IPPROTO_NONE:
 181                         (void)printf("no next header");
 182                         goto end;
 183
 184                 default:
 185                         (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
 186                         goto end;
 187                 }
 188         }
 189
 190  end:
 191
 192         flow = EXTRACT_32BITS(&ip6->ip6_flow);
 193 #if 0
 194         /* rfc1883 */
 195         if (flow & 0x0f000000)
 196                 (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
 197         if (flow & 0x00ffffff)
 198                 (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
 199 #else
 200         /* RFC 2460 */
 201         if (flow & 0x0ff00000)
 202                 (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
 203         if (flow & 0x000fffff)
 204                 (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
 205 #endif
 206
 207         if (ip6->ip6_hlim <= 1)
 208                 (void)printf(" [hlim %u]", ip6->ip6_hlim);
 209
 210         if (vflag) {
 211                 printf(" (");
 212                 (void)printf("len %u", payload_len);
 213                 if (ip6->ip6_hlim > 1)
 214                         (void)printf(", hlim %d", (int)ip6->ip6_hlim);
 215                 printf(")");
 216         }
 217         return;
 218 trunc:
 219         (void)printf("[|ip6]");
 220 }
 221
 222 #endif /* INET6 */