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 1.31 2003-06-07 11:57:54 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 #include "extract.h"
  42
  43 #include "ip6.h"
  44 #include "ipproto.h"
  45
  46 /*
  47  * print an IP6 datagram.
  48  */
  49 void
  50 ip6_print(register const u_char *bp, register u_int length)
  51 {
  52         register const struct ip6_hdr *ip6;
  53         register int advance;
  54         register u_int len;
  55         register const u_char *cp;
  56         int nh;
  57         int fragmented = 0;
  58         u_int flow;
  59
  60         ip6 = (const struct ip6_hdr *)bp;
  61
  62         TCHECK(*ip6);
  63         if (length < sizeof (struct ip6_hdr)) {
  64                 (void)printf("truncated-ip6 %d", length);
  65                 return;
  66         }
  67         advance = sizeof(struct ip6_hdr);
  68
  69         len = EXTRACT_16BITS(&ip6->ip6_plen);
  70         if (length < len + advance)
  71                 (void)printf("truncated-ip6 - %d bytes missing!",
  72                         len + advance - length);
  73
  74         cp = (const u_char *)ip6;
  75         nh = ip6->ip6_nxt;
  76         while (cp < snapend) {
  77                 cp += advance;
  78
  79                 if (cp == (const u_char *)(ip6 + 1)
  80                  && nh != IPPROTO_TCP && nh != IPPROTO_UDP
  81                  && nh != IPPROTO_SCTP) {
  82                         (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
  83                                      ip6addr_string(&ip6->ip6_dst));
  84                 }
  85
  86                 switch (nh) {
  87                 case IPPROTO_HOPOPTS:
  88                         advance = hbhopt_print(cp);
  89                         nh = *cp;
  90                         break;
  91                 case IPPROTO_DSTOPTS:
  92                         advance = dstopt_print(cp);
  93                         nh = *cp;
  94                         break;
  95                 case IPPROTO_FRAGMENT:
  96                         advance = frag6_print(cp, (const u_char *)ip6);
  97                         if (snapend <= cp + advance)
  98                                 goto end;
  99                         nh = *cp;
 100                         fragmented = 1;
 101                         break;
 102
 103                 case IPPROTO_MOBILITY:
 104                         /*
 105                          * XXX - we don't use "advance"; is this
 106                          * header always a final header?
 107                          */
 108                         advance = mobility_print(cp, (const u_char *)ip6);
 109                         nh = *cp;
 110                         goto end;
 111                 case IPPROTO_ROUTING:
 112                         advance = rt6_print(cp, (const u_char *)ip6);
 113                         nh = *cp;
 114                         break;
 115                 case IPPROTO_SCTP:
 116                         sctp_print(cp, (const u_char *)ip6,
 117                                 len + sizeof(struct ip6_hdr) - (cp - bp));
 118                         goto end;
 119                 case IPPROTO_TCP:
 120                         tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 121                                 (const u_char *)ip6, fragmented);
 122                         goto end;
 123                 case IPPROTO_UDP:
 124                         udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 125                                 (const u_char *)ip6, fragmented);
 126                         goto end;
 127                 case IPPROTO_ICMPV6:
 128                         icmp6_print(cp, (const u_char *)ip6, fragmented);
 129                         goto end;
 130                 case IPPROTO_AH:
 131                         advance = ah_print(cp);
 132                         nh = *cp;
 133                         break;
 134                 case IPPROTO_ESP:
 135                     {
 136                         int enh, padlen;
 137                         advance = esp_print(cp, (const u_char *)ip6, &enh, &padlen);
 138                         if (enh < 0)
 139                                 goto end;
 140                         nh = enh & 0xff;
 141                         len -= padlen;
 142                         break;
 143                     }
 144                 case IPPROTO_IPCOMP:
 145                     {
 146                         int enh;
 147                         advance = ipcomp_print(cp, &enh);
 148                         if (enh < 0)
 149                                 goto end;
 150                         nh = enh & 0xff;
 151                         break;
 152                     }
 153
 154                 case IPPROTO_PIM:
 155                         pim_print(cp, len);
 156                         goto end;
 157                 case IPPROTO_OSPF:
 158                         ospf6_print(cp, len);
 159                         goto end;
 160
 161                 case IPPROTO_IPV6:
 162                         ip6_print(cp, len);
 163                         goto end;
 164
 165                 case IPPROTO_IPV4:
 166                         ip_print(cp, len);
 167                         goto end;
 168
 169                 case IPPROTO_NONE:
 170                         (void)printf("no next header");
 171                         goto end;
 172
 173                 default:
 174                         (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
 175                         goto end;
 176                 }
 177         }
 178
 179  end:
 180
 181         flow = EXTRACT_32BITS(&ip6->ip6_flow);
 182 #if 0
 183         /* rfc1883 */
 184         if (flow & 0x0f000000)
 185                 (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
 186         if (flow & 0x00ffffff)
 187                 (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
 188 #else
 189         /* RFC 2460 */
 190         if (flow & 0x0ff00000)
 191                 (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
 192         if (flow & 0x000fffff)
 193                 (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
 194 #endif
 195
 196         if (ip6->ip6_hlim <= 1)
 197                 (void)printf(" [hlim %d]", (int)ip6->ip6_hlim);
 198
 199         if (vflag) {
 200                 printf(" (");
 201                 (void)printf("len %d", len);
 202                 if (ip6->ip6_hlim > 1)
 203                         (void)printf(", hlim %d", (int)ip6->ip6_hlim);
 204                 printf(")");
 205         }
 206         return;
 207 trunc:
 208         (void)printf("[|ip6]");
 209 }
 210
 211 #endif /* INET6 */