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 1.25 2002-08-02 04:10:14 guy Exp $";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #ifdef INET6
  32
  33 #include <tcpdump-stdinc.h>
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38
  39 #include "interface.h"
  40 #include "addrtoname.h"
  41
  42 #include "ip6.h"
  43
  44 /*
  45  * print an IP6 datagram.
  46  */
  47 void
  48 ip6_print(register const u_char *bp, register u_int length)
  49 {
  50         register const struct ip6_hdr *ip6;
  51         register int advance;
  52         register u_int len;
  53         register const u_char *cp;
  54         int nh;
  55         int fragmented = 0;
  56         u_int flow;
  57
  58         ip6 = (const struct ip6_hdr *)bp;
  59
  60 #ifdef LBL_ALIGN
  61         /*
  62          * The IP6 header is not 16-byte aligned, so copy into abuf.
  63          */
  64         if ((u_long)ip6 & 15) {
  65                 static u_char *abuf;
  66
  67                 if (abuf == NULL) {
  68                         abuf = malloc(snaplen);
  69                         if (abuf == NULL)
  70                                 error("ip6_print: malloc");
  71                 }
  72                 memcpy(abuf, ip6, min(length, snaplen));
  73                 snapend += abuf - (u_char *)ip6;
  74                 packetp = abuf;
  75                 ip6 = (struct ip6_hdr *)abuf;
  76                 bp = abuf;
  77         }
  78 #endif
  79         TCHECK(*ip6);
  80         if (length < sizeof (struct ip6_hdr)) {
  81                 (void)printf("truncated-ip6 %d", length);
  82                 return;
  83         }
  84         advance = sizeof(struct ip6_hdr);
  85
  86         len = ntohs(ip6->ip6_plen);
  87         if (length < len + advance)
  88                 (void)printf("truncated-ip6 - %d bytes missing!",
  89                         len + advance - length);
  90
  91         cp = (const u_char *)ip6;
  92         nh = ip6->ip6_nxt;
  93         while (cp < snapend) {
  94                 cp += advance;
  95
  96                 if (cp == (const u_char *)(ip6 + 1)
  97                  && nh != IPPROTO_TCP && nh != IPPROTO_UDP) {
  98                         (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
  99                                      ip6addr_string(&ip6->ip6_dst));
 100                 }
 101
 102                 switch (nh) {
 103                 case IPPROTO_HOPOPTS:
 104                         advance = hbhopt_print(cp);
 105                         nh = *cp;
 106                         break;
 107                 case IPPROTO_DSTOPTS:
 108                         advance = dstopt_print(cp);
 109                         nh = *cp;
 110                         break;
 111                 case IPPROTO_FRAGMENT:
 112                         advance = frag6_print(cp, (const u_char *)ip6);
 113                         if (snapend <= cp + advance)
 114                                 goto end;
 115                         nh = *cp;
 116                         fragmented = 1;
 117                         break;
 118 #ifndef IPPROTO_MOBILITY
 119 #define IPPROTO_MOBILITY 62
 120 #endif
 121                 case IPPROTO_MOBILITY:
 122                         /*
 123                          * XXX - we don't use "advance"; is this
 124                          * header always a final header?
 125                          */
 126                         advance = mobility_print(cp, (const u_char *)ip6);
 127                         nh = *cp;
 128                         goto end;
 129                 case IPPROTO_ROUTING:
 130                         advance = rt6_print(cp, (const u_char *)ip6);
 131                         nh = *cp;
 132                         break;
 133                 case IPPROTO_TCP:
 134                         tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 135                                 (const u_char *)ip6, fragmented);
 136                         goto end;
 137                 case IPPROTO_UDP:
 138                         udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 139                                 (const u_char *)ip6, fragmented);
 140                         goto end;
 141                 case IPPROTO_ICMPV6:
 142                         icmp6_print(cp, (const u_char *)ip6);
 143                         goto end;
 144                 case IPPROTO_AH:
 145                         advance = ah_print(cp, (const u_char *)ip6);
 146                         nh = *cp;
 147                         break;
 148                 case IPPROTO_ESP:
 149                     {
 150                         int enh, padlen;
 151                         advance = esp_print(cp, (const u_char *)ip6, &enh, &padlen);
 152                         if (enh < 0)
 153                                 goto end;
 154                         nh = enh & 0xff;
 155                         len -= padlen;
 156                         break;
 157                     }
 158 #ifndef IPPROTO_IPCOMP
 159 #define IPPROTO_IPCOMP  108
 160 #endif
 161                 case IPPROTO_IPCOMP:
 162                     {
 163                         int enh;
 164                         advance = 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         return;
 230 trunc:
 231         (void)printf("[|ip6]");
 232 }
 233
 234 #endif /* INET6 */