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 1.18 2001-09-17 21:58:03 fenner 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
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <unistd.h>
  43 #include <string.h>
  44
  45 #include "interface.h"
  46 #include "addrtoname.h"
  47
  48 #include "ip6.h"
  49
  50 /*
  51  * print an IP6 datagram.
  52  */
  53 void
  54 ip6_print(register const u_char *bp, register u_int length)
  55 {
  56         register const struct ip6_hdr *ip6;
  57         register int advance;
  58         register u_int len;
  59         register const u_char *cp;
  60         int nh;
  61         int fragmented = 0;
  62         u_int flow;
  63
  64         ip6 = (const struct ip6_hdr *)bp;
  65
  66 #ifdef LBL_ALIGN
  67         /*
  68          * The IP6 header is not 16-byte aligned, so copy into abuf.
  69          * This will never happen with BPF.  It does happen raw packet
  70          * dumps from -r.
  71          */
  72         if ((u_long)ip6 & 15) {
  73                 static u_char *abuf;
  74
  75                 if (abuf == NULL)
  76                         abuf = malloc(snaplen);
  77                 memcpy(abuf, ip6, min(length, snaplen));
  78                 snapend += abuf - (u_char *)ip6;
  79                 packetp = abuf;
  80                 ip6 = (struct ip6_hdr *)abuf;
  81         }
  82 #endif
  83         TCHECK(*ip6);
  84         if (length < sizeof (struct ip6_hdr)) {
  85                 (void)printf("truncated-ip6 %d", length);
  86                 return;
  87         }
  88         advance = sizeof(struct ip6_hdr);
  89
  90         len = ntohs(ip6->ip6_plen);
  91         if (length < len + advance)
  92                 (void)printf("truncated-ip6 - %d bytes missing!",
  93                         len + advance - length);
  94
  95         cp = (const u_char *)ip6;
  96         nh = ip6->ip6_nxt;
  97         while (cp < snapend) {
  98                 cp += advance;
  99
 100                 if (cp == (const u_char *)(ip6 + 1)
 101                  && nh != IPPROTO_TCP && nh != IPPROTO_UDP) {
 102                         (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
 103                                      ip6addr_string(&ip6->ip6_dst));
 104                 }
 105
 106                 switch (nh) {
 107                 case IPPROTO_HOPOPTS:
 108                         advance = hbhopt_print(cp);
 109                         nh = *cp;
 110                         break;
 111                 case IPPROTO_DSTOPTS:
 112                         advance = dstopt_print(cp);
 113                         nh = *cp;
 114                         break;
 115                 case IPPROTO_FRAGMENT:
 116                         advance = frag6_print(cp, (const u_char *)ip6);
 117                         if (snapend <= cp + advance)
 118                                 goto end;
 119                         nh = *cp;
 120                         fragmented = 1;
 121                         break;
 122                 case IPPROTO_ROUTING:
 123                         advance = rt6_print(cp, (const u_char *)ip6);
 124                         nh = *cp;
 125                         break;
 126                 case IPPROTO_TCP:
 127                         tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 128                                 (const u_char *)ip6, fragmented);
 129                         goto end;
 130                 case IPPROTO_UDP:
 131                         udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 132                                 (const u_char *)ip6, fragmented);
 133                         goto end;
 134                 case IPPROTO_ICMPV6:
 135                         icmp6_print(cp, (const u_char *)ip6);
 136                         goto end;
 137                 case IPPROTO_AH:
 138                         advance = ah_print(cp, (const u_char *)ip6);
 139                         nh = *cp;
 140                         break;
 141                 case IPPROTO_ESP:
 142                     {
 143                         int enh, padlen;
 144                         advance = esp_print(cp, (const u_char *)ip6, &enh, &padlen);
 145                         if (enh < 0)
 146                                 goto end;
 147                         nh = enh & 0xff;
 148                         len -= padlen;
 149                         break;
 150                     }
 151 #ifndef IPPROTO_IPCOMP
 152 #define IPPROTO_IPCOMP  108
 153 #endif
 154                 case IPPROTO_IPCOMP:
 155                     {
 156                         int enh;
 157                         advance = ipcomp_print(cp, (const u_char *)ip6, &enh);
 158                         if (enh < 0)
 159                                 goto end;
 160                         nh = enh & 0xff;
 161                         break;
 162                     }
 163
 164 #ifndef IPPROTO_PIM
 165 #define IPPROTO_PIM     103
 166 #endif
 167                 case IPPROTO_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         return;
 223 trunc:
 224         (void)printf("[|ip6]");
 225 }
 226
 227 #endif /* INET6 */