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[] _U_ =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.35 2003-11-19 00:17:32 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         const u_char *ipend;
  56         register const u_char *cp;
  57         int nh;
  58         int fragmented = 0;
  59         u_int flow;
  60
  61         ip6 = (const struct ip6_hdr *)bp;
  62
  63         TCHECK(*ip6);
  64         if (length < sizeof (struct ip6_hdr)) {
  65                 (void)printf("truncated-ip6 %d", length);
  66                 return;
  67         }
  68
  69         len = EXTRACT_16BITS(&ip6->ip6_plen) + sizeof(struct ip6_hdr);
  70         if (length < len)
  71                 (void)printf("truncated-ip6 - %d bytes missing!",
  72                         len - length);
  73
  74         /*
  75          * Cut off the snapshot length to the end of the IP payload.
  76          */
  77         ipend = bp + len;
  78         if (ipend < snapend)
  79                 snapend = ipend;
  80
  81         cp = (const u_char *)ip6;
  82         advance = sizeof(struct ip6_hdr);
  83         nh = ip6->ip6_nxt;
  84         while (cp < snapend) {
  85                 cp += advance;
  86                 len -= advance;
  87
  88                 if (cp == (const u_char *)(ip6 + 1) &&
  89                     nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
  90                     nh != IPPROTO_SCTP) {
  91                         (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
  92                                      ip6addr_string(&ip6->ip6_dst));
  93                 }
  94
  95                 switch (nh) {
  96                 case IPPROTO_HOPOPTS:
  97                         advance = hbhopt_print(cp);
  98                         nh = *cp;
  99                         break;
 100                 case IPPROTO_DSTOPTS:
 101                         advance = dstopt_print(cp);
 102                         nh = *cp;
 103                         break;
 104                 case IPPROTO_FRAGMENT:
 105                         advance = frag6_print(cp, (const u_char *)ip6);
 106                         if (snapend <= cp + advance)
 107                                 goto end;
 108                         nh = *cp;
 109                         fragmented = 1;
 110                         break;
 111
 112                 case IPPROTO_MOBILITY:
 113                         /*
 114                          * XXX - we don't use "advance"; is this
 115                          * header always a final header?
 116                          */
 117                         advance = mobility_print(cp, (const u_char *)ip6);
 118                         nh = *cp;
 119                         goto end;
 120                 case IPPROTO_ROUTING:
 121                         advance = rt6_print(cp, (const u_char *)ip6);
 122                         nh = *cp;
 123                         break;
 124                 case IPPROTO_SCTP:
 125                         sctp_print(cp, (const u_char *)ip6,
 126                                 len + sizeof(struct ip6_hdr) - (cp - bp));
 127                         goto end;
 128                 case IPPROTO_TCP:
 129                         tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 130                                 (const u_char *)ip6, fragmented);
 131                         goto end;
 132                 case IPPROTO_UDP:
 133                         udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 134                                 (const u_char *)ip6, fragmented);
 135                         goto end;
 136                 case IPPROTO_ICMPV6:
 137                         icmp6_print(cp, (const u_char *)ip6, fragmented);
 138                         goto end;
 139                 case IPPROTO_AH:
 140                         advance = ah_print(cp);
 141                         nh = *cp;
 142                         break;
 143                 case IPPROTO_ESP:
 144                     {
 145                         int enh, padlen;
 146                         advance = esp_print(cp, (const u_char *)ip6, &enh, &padlen);
 147                         if (enh < 0)
 148                                 goto end;
 149                         nh = enh & 0xff;
 150                         len -= padlen;
 151                         break;
 152                     }
 153                 case IPPROTO_IPCOMP:
 154                     {
 155                         int enh;
 156                         advance = ipcomp_print(cp, &enh);
 157                         if (enh < 0)
 158                                 goto end;
 159                         nh = enh & 0xff;
 160                         break;
 161                     }
 162
 163                 case IPPROTO_PIM:
 164                         pim_print(cp, len);
 165                         goto end;
 166                 case IPPROTO_OSPF:
 167                         ospf6_print(cp, len);
 168                         goto end;
 169
 170                 case IPPROTO_IPV6:
 171                         ip6_print(cp, len);
 172                         goto end;
 173
 174                 case IPPROTO_IPV4:
 175                         ip_print(cp, len);
 176                         goto end;
 177
 178                 case IPPROTO_NONE:
 179                         (void)printf("no next header");
 180                         goto end;
 181
 182                 default:
 183                         (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
 184                         goto end;
 185                 }
 186         }
 187
 188  end:
 189
 190         flow = EXTRACT_32BITS(&ip6->ip6_flow);
 191 #if 0
 192         /* rfc1883 */
 193         if (flow & 0x0f000000)
 194                 (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
 195         if (flow & 0x00ffffff)
 196                 (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
 197 #else
 198         /* RFC 2460 */
 199         if (flow & 0x0ff00000)
 200                 (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
 201         if (flow & 0x000fffff)
 202                 (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
 203 #endif
 204
 205         if (ip6->ip6_hlim <= 1)
 206                 (void)printf(" [hlim %d]", (int)ip6->ip6_hlim);
 207
 208         if (vflag) {
 209                 printf(" (");
 210                 (void)printf("len %d", len);
 211                 if (ip6->ip6_hlim > 1)
 212                         (void)printf(", hlim %d", (int)ip6->ip6_hlim);
 213                 printf(")");
 214         }
 215         return;
 216 trunc:
 217         (void)printf("[|ip6]");
 218 }
 219
 220 #endif /* INET6 */