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     "@(#) /master/usr.sbin/tcpdump/tcpdump/print-ip.c,v 2.1 1995/02/03 18:14:45 polk Exp (LBL)";
  25 #endif
  26
  27 #ifdef INET6
  28
  29 #include <sys/param.h>
  30 #include <sys/time.h>
  31 #include <sys/types.h>
  32 #include <sys/socket.h>
  33
  34 #include <netinet/in.h>
  35 #include <netinet/in_systm.h>
  36 #include <netinet/ip.h>
  37 #include <netinet/ip_var.h>
  38 #include <netinet/udp.h>
  39 #include <netinet/udp_var.h>
  40 #include <netinet/tcp.h>
  41
  42 #include <stdio.h>
  43 #ifdef __STDC__
  44 #include <stdlib.h>
  45 #endif
  46 #include <unistd.h>
  47
  48 #include "interface.h"
  49 #include "addrtoname.h"
  50
  51 #include <netinet/ip6.h>
  52
  53 /*
  54  * print an IP6 datagram.
  55  */
  56 void
  57 ip6_print(register const u_char *bp, register int length)
  58 {
  59         register const struct ip6_hdr *ip6;
  60         register int hlen;
  61         register int len;
  62         register const u_char *cp;
  63         int nh;
  64         u_int flow;
  65
  66         ip6 = (const struct ip6_hdr *)bp;
  67
  68 #ifdef TCPDUMP_ALIGN
  69         /*
  70          * The IP header is not word aligned, so copy into abuf.
  71          * This will never happen with BPF.  It does happen raw packet
  72          * dumps from -r.
  73          */
  74         if ((int)ip & (sizeof(long)-1)) {
  75                 static u_char *abuf;
  76
  77                 if (abuf == 0)
  78                         abuf = (u_char *)malloc(snaplen);
  79                 bcopy((char *)ip, (char *)abuf, min(length, snaplen));
  80                 snapend += abuf - (u_char *)ip;
  81                 packetp = abuf;
  82                 ip = (struct ip6_hdr *)abuf;
  83         }
  84 #endif
  85         if ((u_char *)(ip6 + 1) > snapend) {
  86                 printf("[|ip6]");
  87                 return;
  88         }
  89         if (length < sizeof (struct ip6_hdr)) {
  90                 (void)printf("truncated-ip6 %d", length);
  91                 return;
  92         }
  93         hlen = sizeof(struct ip6_hdr);
  94
  95         len = ntohs(ip6->ip6_plen);
  96         if (length < len + hlen)
  97                 (void)printf("truncated-ip6 - %d bytes missing!",
  98                         len + hlen - length);
  99
 100         cp = (const u_char *)ip6;
 101         nh = ip6->ip6_nxt;
 102         while (cp < snapend) {
 103                 cp += hlen;
 104
 105                 if (cp == (u_char *)(ip6 + 1)
 106                  && nh != IPPROTO_TCP && nh != IPPROTO_UDP) {
 107                         (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
 108                                      ip6addr_string(&ip6->ip6_dst));
 109                 }
 110
 111                 switch (nh) {
 112                 case IPPROTO_HOPOPTS:
 113                         hlen = hbhopt_print(cp);
 114                         nh = *cp;
 115                         break;
 116                 case IPPROTO_DSTOPTS:
 117                         hlen = dstopt_print(cp);
 118                         nh = *cp;
 119                         break;
 120                 case IPPROTO_FRAGMENT:
 121                         hlen = frag6_print(cp, (const u_char *)ip6);
 122                         if (snapend <= cp + hlen)
 123                                 goto end;
 124                         nh = *cp;
 125                         break;
 126                 case IPPROTO_ROUTING:
 127                         hlen = rt6_print(cp, (const u_char *)ip6);
 128                         nh = *cp;
 129                         break;
 130                 case IPPROTO_TCP:
 131                         tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 132                                 (const u_char *)ip6);
 133                         goto end;
 134                 case IPPROTO_UDP:
 135                         udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 136                                 (const u_char *)ip6);
 137                         goto end;
 138                 case IPPROTO_ICMPV6:
 139                         icmp6_print(cp, (const u_char *)ip6);
 140                         goto end;
 141                 case IPPROTO_AH:
 142                         hlen = ah_print(cp, (const u_char *)ip6);
 143                         nh = *cp;
 144                         break;
 145                 case IPPROTO_ESP:
 146                     {
 147                         int enh;
 148                         cp += esp_print(cp, (const u_char *)ip6, &enh);
 149                         if (enh < 0)
 150                                 goto end;
 151                         nh = enh & 0xff;
 152                         break;
 153                     }
 154 #ifndef IPPROTO_IPCOMP
 155 #define IPPROTO_IPCOMP  108
 156 #endif
 157                 case IPPROTO_IPCOMP:
 158                     {
 159                         int enh;
 160                         cp += ipcomp_print(cp, (const u_char *)ip6, &enh);
 161                         if (enh < 0)
 162                                 goto end;
 163                         nh = enh & 0xff;
 164                         break;
 165                     }
 166                 case IPPROTO_PIM:
 167                         (void)printf("PIM");
 168                         pim_print(cp, len);
 169                         goto end;
 170 #ifndef IPPROTO_OSPF
 171 #define IPPROTO_OSPF 89
 172 #endif
 173                 case IPPROTO_OSPF:
 174                         ospf6_print(cp, len);
 175                         goto end;
 176                 case IPPROTO_IPV6:
 177                         ip6_print(cp, len);
 178                         goto end;
 179 #ifndef IPPROTO_IPV4
 180 #define IPPROTO_IPV4    4
 181 #endif
 182                 case IPPROTO_IPV4:
 183                         ip_print(cp, len);
 184                         goto end;
 185                 case IPPROTO_NONE:
 186                         (void)printf("no next header");
 187                         goto end;
 188
 189                 default:
 190                         (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
 191                         goto end;
 192                 }
 193         }
 194
 195  end:
 196
 197         flow = ntohl(ip6->ip6_flow);
 198 #if 0
 199         /* rfc1883 */
 200         if (flow & 0x0f000000)
 201                 (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
 202         if (flow & 0x00ffffff)
 203                 (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
 204 #else
 205         /* RFC 2460 */
 206         if (flow & 0x0ff00000)
 207                 (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
 208         if (flow & 0x000fffff)
 209                 (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
 210 #endif
 211
 212         if (ip6->ip6_hlim <= 1)
 213                 (void)printf(" [hlim %d]", (int)ip6->ip6_hlim);
 214
 215         if (vflag) {
 216                 printf(" (");
 217                 (void)printf("len %d", len);
 218                 if (ip6->ip6_hlim > 1)
 219                         (void)printf(", hlim %d", (int)ip6->ip6_hlim);
 220                 printf(")");
 221         }
 222 }
 223
 224 #endif /* INET6 */