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 1.7 2000-07-11 00:55:22 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 #include <stdlib.h>
  48 #include <unistd.h>
  49
  50 #include "interface.h"
  51 #include "addrtoname.h"
  52
  53 #include <netinet/ip6.h>
  54
  55 /*
  56  * print an IP6 datagram.
  57  */
  58 void
  59 ip6_print(register const u_char *bp, register int length)
  60 {
  61         register const struct ip6_hdr *ip6;
  62         register int hlen;
  63         register int len;
  64         register const u_char *cp;
  65         int nh;
  66         u_int flow;
  67
  68         ip6 = (const struct ip6_hdr *)bp;
  69
  70 #ifdef LBL_ALIGN
  71         /*
  72          * The IP header is not word aligned, so copy into abuf.
  73          * This will never happen with BPF.  It does happen raw packet
  74          * dumps from -r.
  75          */
  76         if ((int)ip & (sizeof(long)-1)) {
  77                 static u_char *abuf;
  78
  79                 if (abuf == 0)
  80                         abuf = (u_char *)malloc(snaplen);
  81                 bcopy((char *)ip, (char *)abuf, min(length, snaplen));
  82                 snapend += abuf - (u_char *)ip;
  83                 packetp = abuf;
  84                 ip = (struct ip6_hdr *)abuf;
  85         }
  86 #endif
  87         if ((u_char *)(ip6 + 1) > snapend) {
  88                 printf("[|ip6]");
  89                 return;
  90         }
  91         if (length < sizeof (struct ip6_hdr)) {
  92                 (void)printf("truncated-ip6 %d", length);
  93                 return;
  94         }
  95         hlen = sizeof(struct ip6_hdr);
  96
  97         len = ntohs(ip6->ip6_plen);
  98         if (length < len + hlen)
  99                 (void)printf("truncated-ip6 - %d bytes missing!",
 100                         len + hlen - length);
 101
 102         cp = (const u_char *)ip6;
 103         nh = ip6->ip6_nxt;
 104         while (cp < snapend) {
 105                 cp += hlen;
 106
 107                 if (cp == (u_char *)(ip6 + 1)
 108                  && nh != IPPROTO_TCP && nh != IPPROTO_UDP) {
 109                         (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
 110                                      ip6addr_string(&ip6->ip6_dst));
 111                 }
 112
 113                 switch (nh) {
 114                 case IPPROTO_HOPOPTS:
 115                         hlen = hbhopt_print(cp);
 116                         nh = *cp;
 117                         break;
 118                 case IPPROTO_DSTOPTS:
 119                         hlen = dstopt_print(cp);
 120                         nh = *cp;
 121                         break;
 122                 case IPPROTO_FRAGMENT:
 123                         hlen = frag6_print(cp, (const u_char *)ip6);
 124                         if (snapend <= cp + hlen)
 125                                 goto end;
 126                         nh = *cp;
 127                         break;
 128                 case IPPROTO_ROUTING:
 129                         hlen = rt6_print(cp, (const u_char *)ip6);
 130                         nh = *cp;
 131                         break;
 132                 case IPPROTO_TCP:
 133                         tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 134                                 (const u_char *)ip6);
 135                         goto end;
 136                 case IPPROTO_UDP:
 137                         udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 138                                 (const u_char *)ip6);
 139                         goto end;
 140                 case IPPROTO_ICMPV6:
 141                         icmp6_print(cp, (const u_char *)ip6);
 142                         goto end;
 143                 case IPPROTO_AH:
 144                         hlen = ah_print(cp, (const u_char *)ip6);
 145                         nh = *cp;
 146                         break;
 147                 case IPPROTO_ESP:
 148                     {
 149                         int enh;
 150                         cp += esp_print(cp, (const u_char *)ip6, &enh);
 151                         if (enh < 0)
 152                                 goto end;
 153                         nh = enh & 0xff;
 154                         break;
 155                     }
 156 #ifndef IPPROTO_IPCOMP
 157 #define IPPROTO_IPCOMP  108
 158 #endif
 159                 case IPPROTO_IPCOMP:
 160                     {
 161                         int enh;
 162                         cp += ipcomp_print(cp, (const u_char *)ip6, &enh);
 163                         if (enh < 0)
 164                                 goto end;
 165                         nh = enh & 0xff;
 166                         break;
 167                     }
 168
 169 #ifndef IPPROTO_PIM
 170 #define IPPROTO_PIM     103
 171 #endif
 172                 case IPPROTO_PIM:
 173                         pim_print(cp, len);
 174                         goto end;
 175 #ifndef IPPROTO_OSPF
 176 #define IPPROTO_OSPF 89
 177 #endif
 178                 case IPPROTO_OSPF:
 179                         ospf6_print(cp, len);
 180                         goto end;
 181                 case IPPROTO_IPV6:
 182                         ip6_print(cp, len);
 183                         goto end;
 184 #ifndef IPPROTO_IPV4
 185 #define IPPROTO_IPV4    4
 186 #endif
 187                 case IPPROTO_IPV4:
 188                         ip_print(cp, len);
 189                         goto end;
 190                 case IPPROTO_NONE:
 191                         (void)printf("no next header");
 192                         goto end;
 193
 194                 default:
 195                         (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
 196                         goto end;
 197                 }
 198         }
 199
 200  end:
 201
 202         flow = ntohl(ip6->ip6_flow);
 203 #if 0
 204         /* rfc1883 */
 205         if (flow & 0x0f000000)
 206                 (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
 207         if (flow & 0x00ffffff)
 208                 (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
 209 #else
 210         /* RFC 2460 */
 211         if (flow & 0x0ff00000)
 212                 (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
 213         if (flow & 0x000fffff)
 214                 (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
 215 #endif
 216
 217         if (ip6->ip6_hlim <= 1)
 218                 (void)printf(" [hlim %d]", (int)ip6->ip6_hlim);
 219
 220         if (vflag) {
 221                 printf(" (");
 222                 (void)printf("len %d", len);
 223                 if (ip6->ip6_hlim > 1)
 224                         (void)printf(", hlim %d", (int)ip6->ip6_hlim);
 225                 printf(")");
 226         }
 227 }
 228
 229 #endif /* INET6 */