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 1.5 2000-04-09 19:15:14 assar 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 #include <netinet/udp.h>
  43 #include <netinet/udp_var.h>
  44 #include <netinet/tcp.h>
  45
  46 #include <stdio.h>
  47 #ifdef __STDC__
  48 #include <stdlib.h>
  49 #endif
  50 #include <unistd.h>
  51
  52 #include "interface.h"
  53 #include "addrtoname.h"
  54
  55 #include <netinet/ip6.h>
  56
  57 /*
  58  * print an IP6 datagram.
  59  */
  60 void
  61 ip6_print(register const u_char *bp, register int length)
  62 {
  63         register const struct ip6_hdr *ip6;
  64         register int hlen;
  65         register int len;
  66         register const u_char *cp;
  67         int nh;
  68         u_int flow;
  69
  70         ip6 = (const struct ip6_hdr *)bp;
  71
  72 #ifdef TCPDUMP_ALIGN
  73         /*
  74          * The IP header is not word aligned, so copy into abuf.
  75          * This will never happen with BPF.  It does happen raw packet
  76          * dumps from -r.
  77          */
  78         if ((int)ip & (sizeof(long)-1)) {
  79                 static u_char *abuf;
  80
  81                 if (abuf == 0)
  82                         abuf = (u_char *)malloc(snaplen);
  83                 bcopy((char *)ip, (char *)abuf, min(length, snaplen));
  84                 snapend += abuf - (u_char *)ip;
  85                 packetp = abuf;
  86                 ip = (struct ip6_hdr *)abuf;
  87         }
  88 #endif
  89         if ((u_char *)(ip6 + 1) > snapend) {
  90                 printf("[|ip6]");
  91                 return;
  92         }
  93         if (length < sizeof (struct ip6_hdr)) {
  94                 (void)printf("truncated-ip6 %d", length);
  95                 return;
  96         }
  97         hlen = sizeof(struct ip6_hdr);
  98
  99         len = ntohs(ip6->ip6_plen);
 100         if (length < len + hlen)
 101                 (void)printf("truncated-ip6 - %d bytes missing!",
 102                         len + hlen - length);
 103
 104         cp = (const u_char *)ip6;
 105         nh = ip6->ip6_nxt;
 106         while (cp < snapend) {
 107                 cp += hlen;
 108
 109                 if (cp == (u_char *)(ip6 + 1)
 110                  && nh != IPPROTO_TCP && nh != IPPROTO_UDP) {
 111                         (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
 112                                      ip6addr_string(&ip6->ip6_dst));
 113                 }
 114
 115                 switch (nh) {
 116                 case IPPROTO_HOPOPTS:
 117                         hlen = hbhopt_print(cp);
 118                         nh = *cp;
 119                         break;
 120                 case IPPROTO_DSTOPTS:
 121                         hlen = dstopt_print(cp);
 122                         nh = *cp;
 123                         break;
 124                 case IPPROTO_FRAGMENT:
 125                         hlen = frag6_print(cp, (const u_char *)ip6);
 126                         if (snapend <= cp + hlen)
 127                                 goto end;
 128                         nh = *cp;
 129                         break;
 130                 case IPPROTO_ROUTING:
 131                         hlen = rt6_print(cp, (const u_char *)ip6);
 132                         nh = *cp;
 133                         break;
 134                 case IPPROTO_TCP:
 135                         tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 136                                 (const u_char *)ip6);
 137                         goto end;
 138                 case IPPROTO_UDP:
 139                         udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 140                                 (const u_char *)ip6);
 141                         goto end;
 142                 case IPPROTO_ICMPV6:
 143                         icmp6_print(cp, (const u_char *)ip6);
 144                         goto end;
 145                 case IPPROTO_AH:
 146                         hlen = ah_print(cp, (const u_char *)ip6);
 147                         nh = *cp;
 148                         break;
 149                 case IPPROTO_ESP:
 150                     {
 151                         int enh;
 152                         cp += esp_print(cp, (const u_char *)ip6, &enh);
 153                         if (enh < 0)
 154                                 goto end;
 155                         nh = enh & 0xff;
 156                         break;
 157                     }
 158 #ifndef IPPROTO_IPCOMP
 159 #define IPPROTO_IPCOMP  108
 160 #endif
 161                 case IPPROTO_IPCOMP:
 162                     {
 163                         int enh;
 164                         cp += ipcomp_print(cp, (const u_char *)ip6, &enh);
 165                         if (enh < 0)
 166                                 goto end;
 167                         nh = enh & 0xff;
 168                         break;
 169                     }
 170
 171 #ifndef IPPROTO_PIM
 172 #define IPPROTO_PIM     103
 173 #endif
 174                 case IPPROTO_PIM:
 175                         pim_print(cp, len);
 176                         goto end;
 177 #ifndef IPPROTO_OSPF
 178 #define IPPROTO_OSPF 89
 179 #endif
 180                 case IPPROTO_OSPF:
 181                         ospf6_print(cp, len);
 182                         goto end;
 183                 case IPPROTO_IPV6:
 184                         ip6_print(cp, len);
 185                         goto end;
 186 #ifndef IPPROTO_IPV4
 187 #define IPPROTO_IPV4    4
 188 #endif
 189                 case IPPROTO_IPV4:
 190                         ip_print(cp, len);
 191                         goto end;
 192                 case IPPROTO_NONE:
 193                         (void)printf("no next header");
 194                         goto end;
 195
 196                 default:
 197                         (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
 198                         goto end;
 199                 }
 200         }
 201
 202  end:
 203
 204         flow = ntohl(ip6->ip6_flow);
 205 #if 0
 206         /* rfc1883 */
 207         if (flow & 0x0f000000)
 208                 (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
 209         if (flow & 0x00ffffff)
 210                 (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
 211 #else
 212         /* RFC 2460 */
 213         if (flow & 0x0ff00000)
 214                 (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
 215         if (flow & 0x000fffff)
 216                 (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
 217 #endif
 218
 219         if (ip6->ip6_hlim <= 1)
 220                 (void)printf(" [hlim %d]", (int)ip6->ip6_hlim);
 221
 222         if (vflag) {
 223                 printf(" (");
 224                 (void)printf("len %d", len);
 225                 if (ip6->ip6_hlim > 1)
 226                         (void)printf(", hlim %d", (int)ip6->ip6_hlim);
 227                 printf(")");
 228         }
 229 }
 230
 231 #endif /* INET6 */