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 1.38 2003-11-19 06:17:10 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 %d", length);
  67                 return;
  68         }
  69
  70         len = EXTRACT_16BITS(&ip6->ip6_plen) + sizeof(struct ip6_hdr);
  71         if (length < len)
  72                 (void)printf("truncated-ip6 - %d bytes missing!",
  73                         len - length);
  74
  75         /*
  76          * Cut off the snapshot length to the end of the IP payload.
  77          */
  78         ipend = bp + len;
  79         if (ipend < snapend)
  80                 snapend = ipend;
  81
  82         cp = (const u_char *)ip6;
  83         payload_len = len;
  84         advance = sizeof(struct ip6_hdr);
  85         nh = ip6->ip6_nxt;
  86         while (cp < snapend && advance > 0) {
  87                 cp += advance;
  88                 payload_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:
 115                         /*
 116                          * XXX - we don't use "advance"; is this
 117                          * header always a final header?
 118                          */
 119                         advance = mobility_print(cp, (const u_char *)ip6);
 120                         nh = *cp;
 121                         goto end;
 122                 case IPPROTO_ROUTING:
 123                         advance = rt6_print(cp, (const u_char *)ip6);
 124                         nh = *cp;
 125                         break;
 126                 case IPPROTO_SCTP:
 127                         sctp_print(cp, (const u_char *)ip6, payload_len);
 128                         goto end;
 129                 case IPPROTO_TCP:
 130                         tcp_print(cp, payload_len, (const u_char *)ip6,
 131                             fragmented);
 132                         goto end;
 133                 case IPPROTO_UDP:
 134                         udp_print(cp, payload_len, (const u_char *)ip6,
 135                             fragmented);
 136                         goto end;
 137                 case IPPROTO_ICMPV6:
 138                         icmp6_print(cp, payload_len, (const u_char *)ip6,
 139                             fragmented);
 140                         goto end;
 141                 case IPPROTO_AH:
 142                         advance = ah_print(cp);
 143                         nh = *cp;
 144                         break;
 145                 case IPPROTO_ESP:
 146                     {
 147                         int enh, padlen;
 148                         advance = esp_print(cp, (const u_char *)ip6, &enh, &padlen);
 149                         nh = enh & 0xff;
 150                         len -= padlen;
 151                         break;
 152                     }
 153                 case IPPROTO_IPCOMP:
 154                     {
 155                         int enh;
 156                         advance = ipcomp_print(cp, &enh);
 157                         nh = enh & 0xff;
 158                         break;
 159                     }
 160
 161                 case IPPROTO_PIM:
 162                         pim_print(cp, payload_len);
 163                         goto end;
 164                 case IPPROTO_OSPF:
 165                         ospf6_print(cp, payload_len);
 166                         goto end;
 167
 168                 case IPPROTO_IPV6:
 169                         ip6_print(cp, payload_len);
 170                         goto end;
 171
 172                 case IPPROTO_IPV4:
 173                         ip_print(cp, payload_len);
 174                         goto end;
 175
 176                 case IPPROTO_NONE:
 177                         (void)printf("no next header");
 178                         goto end;
 179
 180                 default:
 181                         (void)printf("ip-proto-%d %d", ip6->ip6_nxt,
 182                             payload_len);
 183                         goto end;
 184                 }
 185         }
 186
 187  end:
 188
 189         flow = EXTRACT_32BITS(&ip6->ip6_flow);
 190 #if 0
 191         /* rfc1883 */
 192         if (flow & 0x0f000000)
 193                 (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
 194         if (flow & 0x00ffffff)
 195                 (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
 196 #else
 197         /* RFC 2460 */
 198         if (flow & 0x0ff00000)
 199                 (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
 200         if (flow & 0x000fffff)
 201                 (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
 202 #endif
 203
 204         if (ip6->ip6_hlim <= 1)
 205                 (void)printf(" [hlim %d]", (int)ip6->ip6_hlim);
 206
 207         if (vflag) {
 208                 printf(" (");
 209                 (void)printf("len %d", len);
 210                 if (ip6->ip6_hlim > 1)
 211                         (void)printf(", hlim %d", (int)ip6->ip6_hlim);
 212                 printf(")");
 213         }
 214         return;
 215 trunc:
 216         (void)printf("[|ip6]");
 217 }
 218
 219 #endif /* INET6 */