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 1.10 2000-09-23 08:26:35 guy Exp $";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #ifdef INET6
  32
  33 #include <sys/param.h>
  34 #include <sys/time.h>
  35 #include <sys/types.h>
  36 #include <sys/socket.h>
  37
  38 #include <netinet/in.h>
  39 #include <netinet/in_systm.h>
  40 #include <netinet/ip.h>
  41 #include <netinet/ip_var.h>
  42
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <unistd.h>
  46
  47 #include "interface.h"
  48 #include "addrtoname.h"
  49
  50 #include <netinet/ip6.h>
  51
  52 /*
  53  * print an IP6 datagram.
  54  */
  55 void
  56 ip6_print(register const u_char *bp, register int length)
  57 {
  58         register const struct ip6_hdr *ip6;
  59         register int hlen;
  60         register int len;
  61         register const u_char *cp;
  62         int nh;
  63         u_int flow;
  64
  65         ip6 = (const struct ip6_hdr *)bp;
  66
  67 #ifdef LBL_ALIGN
  68         /*
  69          * The IP6 header is not 16-byte aligned, so copy into abuf.
  70          * This will never happen with BPF.  It does happen raw packet
  71          * dumps from -r.
  72          */
  73         if ((int)ip6 & 15) {
  74                 static u_char *abuf;
  75
  76                 if (abuf == NULL)
  77                         abuf = malloc(snaplen);
  78                 memcpy(abuf, ip6, min(length, snaplen));
  79                 snapend += abuf - (u_char *)ip6;
  80                 packetp = abuf;
  81                 ip6 = (struct ip6_hdr *)abuf;
  82         }
  83 #endif
  84         if ((u_char *)(ip6 + 1) > snapend) {
  85                 printf("[|ip6]");
  86                 return;
  87         }
  88         if (length < sizeof (struct ip6_hdr)) {
  89                 (void)printf("truncated-ip6 %d", length);
  90                 return;
  91         }
  92         hlen = sizeof(struct ip6_hdr);
  93
  94         len = ntohs(ip6->ip6_plen);
  95         if (length < len + hlen)
  96                 (void)printf("truncated-ip6 - %d bytes missing!",
  97                         len + hlen - length);
  98
  99         cp = (const u_char *)ip6;
 100         nh = ip6->ip6_nxt;
 101         while (cp < snapend) {
 102                 cp += hlen;
 103
 104                 if (cp == (u_char *)(ip6 + 1)
 105                  && nh != IPPROTO_TCP && nh != IPPROTO_UDP) {
 106                         (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
 107                                      ip6addr_string(&ip6->ip6_dst));
 108                 }
 109
 110                 switch (nh) {
 111                 case IPPROTO_HOPOPTS:
 112                         hlen = hbhopt_print(cp);
 113                         nh = *cp;
 114                         break;
 115                 case IPPROTO_DSTOPTS:
 116                         hlen = dstopt_print(cp);
 117                         nh = *cp;
 118                         break;
 119                 case IPPROTO_FRAGMENT:
 120                         hlen = frag6_print(cp, (const u_char *)ip6);
 121                         if (snapend <= cp + hlen)
 122                                 goto end;
 123                         nh = *cp;
 124                         break;
 125                 case IPPROTO_ROUTING:
 126                         hlen = rt6_print(cp, (const u_char *)ip6);
 127                         nh = *cp;
 128                         break;
 129                 case IPPROTO_TCP:
 130                         tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 131                                 (const u_char *)ip6);
 132                         goto end;
 133                 case IPPROTO_UDP:
 134                         udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 135                                 (const u_char *)ip6);
 136                         goto end;
 137                 case IPPROTO_ICMPV6:
 138                         icmp6_print(cp, (const u_char *)ip6);
 139                         goto end;
 140                 case IPPROTO_AH:
 141                         hlen = ah_print(cp, (const u_char *)ip6);
 142                         nh = *cp;
 143                         break;
 144                 case IPPROTO_ESP:
 145                     {
 146                         int enh;
 147                         cp += esp_print(cp, (const u_char *)ip6, &enh);
 148                         if (enh < 0)
 149                                 goto end;
 150                         nh = enh & 0xff;
 151                         break;
 152                     }
 153 #ifndef IPPROTO_IPCOMP
 154 #define IPPROTO_IPCOMP  108
 155 #endif
 156                 case IPPROTO_IPCOMP:
 157                     {
 158                         int enh;
 159                         cp += ipcomp_print(cp, (const u_char *)ip6, &enh);
 160                         if (enh < 0)
 161                                 goto end;
 162                         nh = enh & 0xff;
 163                         break;
 164                     }
 165
 166 #ifndef IPPROTO_PIM
 167 #define IPPROTO_PIM     103
 168 #endif
 169                 case IPPROTO_PIM:
 170                         pim_print(cp, len);
 171                         goto end;
 172 #ifndef IPPROTO_OSPF
 173 #define IPPROTO_OSPF 89
 174 #endif
 175                 case IPPROTO_OSPF:
 176                         ospf6_print(cp, len);
 177                         goto end;
 178                 case IPPROTO_IPV6:
 179                         ip6_print(cp, len);
 180                         goto end;
 181 #ifndef IPPROTO_IPV4
 182 #define IPPROTO_IPV4    4
 183 #endif
 184                 case IPPROTO_IPV4:
 185                         ip_print(cp, len);
 186                         goto end;
 187                 case IPPROTO_NONE:
 188                         (void)printf("no next header");
 189                         goto end;
 190
 191                 default:
 192                         (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
 193                         goto end;
 194                 }
 195         }
 196
 197  end:
 198
 199         flow = ntohl(ip6->ip6_flow);
 200 #if 0
 201         /* rfc1883 */
 202         if (flow & 0x0f000000)
 203                 (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
 204         if (flow & 0x00ffffff)
 205                 (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
 206 #else
 207         /* RFC 2460 */
 208         if (flow & 0x0ff00000)
 209                 (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
 210         if (flow & 0x000fffff)
 211                 (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
 212 #endif
 213
 214         if (ip6->ip6_hlim <= 1)
 215                 (void)printf(" [hlim %d]", (int)ip6->ip6_hlim);
 216
 217         if (vflag) {
 218                 printf(" (");
 219                 (void)printf("len %d", len);
 220                 if (ip6->ip6_hlim > 1)
 221                         (void)printf(", hlim %d", (int)ip6->ip6_hlim);
 222                 printf(")");
 223         }
 224 }
 225
 226 #endif /* INET6 */