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 1.27 2002-10-18 04:40:03 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
  42 #include "ip6.h"
  43
  44 /*
  45  * print an IP6 datagram.
  46  */
  47 void
  48 ip6_print(register const u_char *bp, register u_int length)
  49 {
  50         register const struct ip6_hdr *ip6;
  51         register int advance;
  52         register u_int len;
  53         register const u_char *cp;
  54         int nh;
  55         int fragmented = 0;
  56         u_int flow;
  57
  58         ip6 = (const struct ip6_hdr *)bp;
  59
  60         TCHECK(*ip6);
  61         if (length < sizeof (struct ip6_hdr)) {
  62                 (void)printf("truncated-ip6 %d", length);
  63                 return;
  64         }
  65         advance = sizeof(struct ip6_hdr);
  66
  67         len = ntohs(ip6->ip6_plen);
  68         if (length < len + advance)
  69                 (void)printf("truncated-ip6 - %d bytes missing!",
  70                         len + advance - length);
  71
  72         cp = (const u_char *)ip6;
  73         nh = ip6->ip6_nxt;
  74         while (cp < snapend) {
  75                 cp += advance;
  76
  77                 if (cp == (const u_char *)(ip6 + 1)
  78                  && nh != IPPROTO_TCP && nh != IPPROTO_UDP) {
  79                         (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
  80                                      ip6addr_string(&ip6->ip6_dst));
  81                 }
  82
  83                 switch (nh) {
  84                 case IPPROTO_HOPOPTS:
  85                         advance = hbhopt_print(cp);
  86                         nh = *cp;
  87                         break;
  88                 case IPPROTO_DSTOPTS:
  89                         advance = dstopt_print(cp);
  90                         nh = *cp;
  91                         break;
  92                 case IPPROTO_FRAGMENT:
  93                         advance = frag6_print(cp, (const u_char *)ip6);
  94                         if (snapend <= cp + advance)
  95                                 goto end;
  96                         nh = *cp;
  97                         fragmented = 1;
  98                         break;
  99 #ifndef IPPROTO_MOBILITY
 100 #define IPPROTO_MOBILITY 62
 101 #endif
 102                 case IPPROTO_MOBILITY:
 103                         /*
 104                          * XXX - we don't use "advance"; is this
 105                          * header always a final header?
 106                          */
 107                         advance = mobility_print(cp, (const u_char *)ip6);
 108                         nh = *cp;
 109                         goto end;
 110                 case IPPROTO_ROUTING:
 111                         advance = rt6_print(cp, (const u_char *)ip6);
 112                         nh = *cp;
 113                         break;
 114                 case IPPROTO_TCP:
 115                         tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 116                                 (const u_char *)ip6, fragmented);
 117                         goto end;
 118                 case IPPROTO_UDP:
 119                         udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 120                                 (const u_char *)ip6, fragmented);
 121                         goto end;
 122                 case IPPROTO_ICMPV6:
 123                         icmp6_print(cp, (const u_char *)ip6);
 124                         goto end;
 125                 case IPPROTO_AH:
 126                         advance = ah_print(cp);
 127                         nh = *cp;
 128                         break;
 129                 case IPPROTO_ESP:
 130                     {
 131                         int enh, padlen;
 132                         advance = esp_print(cp, (const u_char *)ip6, &enh, &padlen);
 133                         if (enh < 0)
 134                                 goto end;
 135                         nh = enh & 0xff;
 136                         len -= padlen;
 137                         break;
 138                     }
 139 #ifndef IPPROTO_IPCOMP
 140 #define IPPROTO_IPCOMP  108
 141 #endif
 142                 case IPPROTO_IPCOMP:
 143                     {
 144                         int enh;
 145                         advance = ipcomp_print(cp, &enh);
 146                         if (enh < 0)
 147                                 goto end;
 148                         nh = enh & 0xff;
 149                         break;
 150                     }
 151
 152 #ifndef IPPROTO_PIM
 153 #define IPPROTO_PIM     103
 154 #endif
 155                 case IPPROTO_PIM:
 156                         pim_print(cp, len);
 157                         goto end;
 158 #ifndef IPPROTO_OSPF
 159 #define IPPROTO_OSPF 89
 160 #endif
 161                 case IPPROTO_OSPF:
 162                         ospf6_print(cp, len);
 163                         goto end;
 164                 case IPPROTO_IPV6:
 165                         ip6_print(cp, len);
 166                         goto end;
 167 #ifndef IPPROTO_IPV4
 168 #define IPPROTO_IPV4    4
 169 #endif
 170                 case IPPROTO_IPV4:
 171                         ip_print(cp, len);
 172                         goto end;
 173                 case IPPROTO_NONE:
 174                         (void)printf("no next header");
 175                         goto end;
 176
 177                 default:
 178                         (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
 179                         goto end;
 180                 }
 181         }
 182
 183  end:
 184
 185         flow = ntohl(ip6->ip6_flow);
 186 #if 0
 187         /* rfc1883 */
 188         if (flow & 0x0f000000)
 189                 (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
 190         if (flow & 0x00ffffff)
 191                 (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
 192 #else
 193         /* RFC 2460 */
 194         if (flow & 0x0ff00000)
 195                 (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
 196         if (flow & 0x000fffff)
 197                 (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
 198 #endif
 199
 200         if (ip6->ip6_hlim <= 1)
 201                 (void)printf(" [hlim %d]", (int)ip6->ip6_hlim);
 202
 203         if (vflag) {
 204                 printf(" (");
 205                 (void)printf("len %d", len);
 206                 if (ip6->ip6_hlim > 1)
 207                         (void)printf(", hlim %d", (int)ip6->ip6_hlim);
 208                 printf(")");
 209         }
 210         return;
 211 trunc:
 212         (void)printf("[|ip6]");
 213 }
 214
 215 #endif /* INET6 */