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[] =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.29 2003-05-02 08:13:55 itojun 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
  45 /*
  46  * print an IP6 datagram.
  47  */
  48 void
  49 ip6_print(register const u_char *bp, register u_int length)
  50 {
  51         register const struct ip6_hdr *ip6;
  52         register int advance;
  53         register u_int len;
  54         register const u_char *cp;
  55         int nh;
  56         int fragmented = 0;
  57         u_int flow;
  58
  59         ip6 = (const struct ip6_hdr *)bp;
  60
  61         TCHECK(*ip6);
  62         if (length < sizeof (struct ip6_hdr)) {
  63                 (void)printf("truncated-ip6 %d", length);
  64                 return;
  65         }
  66         advance = sizeof(struct ip6_hdr);
  67
  68         len = EXTRACT_16BITS(&ip6->ip6_plen);
  69         if (length < len + advance)
  70                 (void)printf("truncated-ip6 - %d bytes missing!",
  71                         len + advance - length);
  72
  73         cp = (const u_char *)ip6;
  74         nh = ip6->ip6_nxt;
  75         while (cp < snapend) {
  76                 cp += advance;
  77
  78                 if (cp == (const u_char *)(ip6 + 1)
  79                  && nh != IPPROTO_TCP && nh != IPPROTO_UDP) {
  80                         (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
  81                                      ip6addr_string(&ip6->ip6_dst));
  82                 }
  83
  84                 switch (nh) {
  85                 case IPPROTO_HOPOPTS:
  86                         advance = hbhopt_print(cp);
  87                         nh = *cp;
  88                         break;
  89                 case IPPROTO_DSTOPTS:
  90                         advance = dstopt_print(cp);
  91                         nh = *cp;
  92                         break;
  93                 case IPPROTO_FRAGMENT:
  94                         advance = frag6_print(cp, (const u_char *)ip6);
  95                         if (snapend <= cp + advance)
  96                                 goto end;
  97                         nh = *cp;
  98                         fragmented = 1;
  99                         break;
 100 #ifndef IPPROTO_MOBILITY
 101 #define IPPROTO_MOBILITY 62
 102 #endif
 103                 case IPPROTO_MOBILITY:
 104                         /*
 105                          * XXX - we don't use "advance"; is this
 106                          * header always a final header?
 107                          */
 108                         advance = mobility_print(cp, (const u_char *)ip6);
 109                         nh = *cp;
 110                         goto end;
 111                 case IPPROTO_ROUTING:
 112                         advance = rt6_print(cp, (const u_char *)ip6);
 113                         nh = *cp;
 114                         break;
 115                 case IPPROTO_TCP:
 116                         tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 117                                 (const u_char *)ip6, fragmented);
 118                         goto end;
 119                 case IPPROTO_UDP:
 120                         udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 121                                 (const u_char *)ip6, fragmented);
 122                         goto end;
 123                 case IPPROTO_ICMPV6:
 124                         icmp6_print(cp, (const u_char *)ip6, fragmented);
 125                         goto end;
 126                 case IPPROTO_AH:
 127                         advance = ah_print(cp);
 128                         nh = *cp;
 129                         break;
 130                 case IPPROTO_ESP:
 131                     {
 132                         int enh, padlen;
 133                         advance = esp_print(cp, (const u_char *)ip6, &enh, &padlen);
 134                         if (enh < 0)
 135                                 goto end;
 136                         nh = enh & 0xff;
 137                         len -= padlen;
 138                         break;
 139                     }
 140 #ifndef IPPROTO_IPCOMP
 141 #define IPPROTO_IPCOMP  108
 142 #endif
 143                 case IPPROTO_IPCOMP:
 144                     {
 145                         int enh;
 146                         advance = ipcomp_print(cp, &enh);
 147                         if (enh < 0)
 148                                 goto end;
 149                         nh = enh & 0xff;
 150                         break;
 151                     }
 152
 153 #ifndef IPPROTO_PIM
 154 #define IPPROTO_PIM     103
 155 #endif
 156                 case IPPROTO_PIM:
 157                         pim_print(cp, len);
 158                         goto end;
 159 #ifndef IPPROTO_OSPF
 160 #define IPPROTO_OSPF 89
 161 #endif
 162                 case IPPROTO_OSPF:
 163                         ospf6_print(cp, len);
 164                         goto end;
 165                 case IPPROTO_IPV6:
 166                         ip6_print(cp, len);
 167                         goto end;
 168 #ifndef IPPROTO_IPV4
 169 #define IPPROTO_IPV4    4
 170 #endif
 171                 case IPPROTO_IPV4:
 172                         ip_print(cp, len);
 173                         goto end;
 174                 case IPPROTO_NONE:
 175                         (void)printf("no next header");
 176                         goto end;
 177
 178                 default:
 179                         (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
 180                         goto end;
 181                 }
 182         }
 183
 184  end:
 185
 186         flow = EXTRACT_32BITS(&ip6->ip6_flow);
 187 #if 0
 188         /* rfc1883 */
 189         if (flow & 0x0f000000)
 190                 (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
 191         if (flow & 0x00ffffff)
 192                 (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
 193 #else
 194         /* RFC 2460 */
 195         if (flow & 0x0ff00000)
 196                 (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
 197         if (flow & 0x000fffff)
 198                 (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
 199 #endif
 200
 201         if (ip6->ip6_hlim <= 1)
 202                 (void)printf(" [hlim %d]", (int)ip6->ip6_hlim);
 203
 204         if (vflag) {
 205                 printf(" (");
 206                 (void)printf("len %d", len);
 207                 if (ip6->ip6_hlim > 1)
 208                         (void)printf(", hlim %d", (int)ip6->ip6_hlim);
 209                 printf(")");
 210         }
 211         return;
 212 trunc:
 213         (void)printf("[|ip6]");
 214 }
 215
 216 #endif /* INET6 */