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 1.32.2.8 2003/11/24 20:31:22 guy 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 %d", length);
  69                 return;
  70         }
  71
  72         payload_len = EXTRACT_16BITS(&ip6->ip6_plen);
  73         len = payload_len + sizeof(struct ip6_hdr);
  74         if (length < len)
  75                 (void)printf("truncated-ip6 - %d bytes missing!",
  76                         len - length);
  77
  78         /*
  79          * Cut off the snapshot length to the end of the IP payload.
  80          */
  81         ipend = bp + len;
  82         if (ipend < snapend)
  83                 snapend = ipend;
  84
  85         cp = (const u_char *)ip6;
  86         advance = sizeof(struct ip6_hdr);
  87         nh = ip6->ip6_nxt;
  88         while (cp < snapend && advance > 0) {
  89                 cp += advance;
  90                 len -= advance;
  91
  92                 if (cp == (const u_char *)(ip6 + 1) &&
  93                     nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
  94                     nh != IPPROTO_SCTP) {
  95                         (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
  96                                      ip6addr_string(&ip6->ip6_dst));
  97                 }
  98
  99                 switch (nh) {
 100                 case IPPROTO_HOPOPTS:
 101                         advance = hbhopt_print(cp);
 102                         nh = *cp;
 103                         break;
 104                 case IPPROTO_DSTOPTS:
 105                         advance = dstopt_print(cp);
 106                         nh = *cp;
 107                         break;
 108                 case IPPROTO_FRAGMENT:
 109                         advance = frag6_print(cp, (const u_char *)ip6);
 110                         if (snapend <= cp + advance)
 111                                 goto end;
 112                         nh = *cp;
 113                         fragmented = 1;
 114                         break;
 115
 116                 case IPPROTO_MOBILITY_OLD:
 117                 case IPPROTO_MOBILITY:
 118                         /*
 119                          * XXX - we don't use "advance"; the current
 120                          * "Mobility Support in IPv6" draft
 121                          * (draft-ietf-mobileip-ipv6-24) says that
 122                          * the next header field in a mobility header
 123                          * should be IPPROTO_NONE, but speaks of
 124                          * the possiblity of a future extension in
 125                          * which payload can be piggybacked atop a
 126                          * mobility header.
 127                          */
 128                         advance = mobility_print(cp, (const u_char *)ip6);
 129                         nh = *cp;
 130                         goto end;
 131                 case IPPROTO_ROUTING:
 132                         advance = rt6_print(cp, (const u_char *)ip6);
 133                         nh = *cp;
 134                         break;
 135                 case IPPROTO_SCTP:
 136                         sctp_print(cp, (const u_char *)ip6, len);
 137                         goto end;
 138                 case IPPROTO_TCP:
 139                         tcp_print(cp, len, (const u_char *)ip6, fragmented);
 140                         goto end;
 141                 case IPPROTO_UDP:
 142                         udp_print(cp, len, (const u_char *)ip6, fragmented);
 143                         goto end;
 144                 case IPPROTO_ICMPV6:
 145                         icmp6_print(cp, len, (const u_char *)ip6, fragmented);
 146                         goto end;
 147                 case IPPROTO_AH:
 148                         advance = ah_print(cp);
 149                         nh = *cp;
 150                         break;
 151                 case IPPROTO_ESP:
 152                     {
 153                         int enh, padlen;
 154                         advance = esp_print(cp, (const u_char *)ip6, &enh, &padlen);
 155                         nh = enh & 0xff;
 156                         len -= padlen;
 157                         break;
 158                     }
 159                 case IPPROTO_IPCOMP:
 160                     {
 161                         int enh;
 162                         advance = ipcomp_print(cp, &enh);
 163                         nh = enh & 0xff;
 164                         break;
 165                     }
 166
 167                 case IPPROTO_PIM:
 168                         pim_print(cp, len);
 169                         goto end;
 170                 case IPPROTO_OSPF:
 171                         ospf6_print(cp, len);
 172                         goto end;
 173
 174                 case IPPROTO_IPV6:
 175                         ip6_print(cp, len);
 176                         goto end;
 177
 178                 case IPPROTO_IPV4:
 179                         ip_print(cp, len);
 180                         goto end;
 181
 182                 case IPPROTO_NONE:
 183                         (void)printf("no next header");
 184                         goto end;
 185
 186                 default:
 187                         (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
 188                         goto end;
 189                 }
 190         }
 191
 192  end:
 193
 194         flow = EXTRACT_32BITS(&ip6->ip6_flow);
 195 #if 0
 196         /* rfc1883 */
 197         if (flow & 0x0f000000)
 198                 (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
 199         if (flow & 0x00ffffff)
 200                 (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
 201 #else
 202         /* RFC 2460 */
 203         if (flow & 0x0ff00000)
 204                 (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
 205         if (flow & 0x000fffff)
 206                 (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
 207 #endif
 208
 209         if (ip6->ip6_hlim <= 1)
 210                 (void)printf(" [hlim %u]", ip6->ip6_hlim);
 211
 212         if (vflag) {
 213                 printf(" (");
 214                 (void)printf("len %u", payload_len);
 215                 if (ip6->ip6_hlim > 1)
 216                         (void)printf(", hlim %d", (int)ip6->ip6_hlim);
 217                 printf(")");
 218         }
 219         return;
 220 trunc:
 221         (void)printf("[|ip6]");
 222 }
 223
 224 #endif /* INET6 */