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print-ip6.c

/*
 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.32.2.8 2003/11/24 20:31:22 guy Exp $";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef INET6

#include <tcpdump-stdinc.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "interface.h"
#include "addrtoname.h"
#include "extract.h"

#include "ip6.h"
#include "ipproto.h"

/*
 * print an IP6 datagram.
 */
void
ip6_print(register const u_char *bp, register u_int length)
{
      register const struct ip6_hdr *ip6;
      register int advance;
      u_int len;
      const u_char *ipend;
      register const u_char *cp;
      register u_int payload_len;
      int nh;
      int fragmented = 0;
      u_int flow;

      ip6 = (const struct ip6_hdr *)bp;

      TCHECK(*ip6);
      if (length < sizeof (struct ip6_hdr)) {
            (void)printf("truncated-ip6 %d", length);
            return;
      }

      payload_len = EXTRACT_16BITS(&ip6->ip6_plen);
      len = payload_len + sizeof(struct ip6_hdr);
      if (length < len)
            (void)printf("truncated-ip6 - %d bytes missing!",
                  len - length);

      /*
       * Cut off the snapshot length to the end of the IP payload.
       */
      ipend = bp + len;
      if (ipend < snapend)
            snapend = ipend;

      cp = (const u_char *)ip6;
      advance = sizeof(struct ip6_hdr);
      nh = ip6->ip6_nxt;
      while (cp < snapend && advance > 0) {
            cp += advance;
            len -= advance;

            if (cp == (const u_char *)(ip6 + 1) &&
                nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
                nh != IPPROTO_SCTP) {
                  (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
                             ip6addr_string(&ip6->ip6_dst));
            }

            switch (nh) {
            case IPPROTO_HOPOPTS:
                  advance = hbhopt_print(cp);
                  nh = *cp;
                  break;
            case IPPROTO_DSTOPTS:
                  advance = dstopt_print(cp);
                  nh = *cp;
                  break;
            case IPPROTO_FRAGMENT:
                  advance = frag6_print(cp, (const u_char *)ip6);
                  if (snapend <= cp + advance)
                        goto end;
                  nh = *cp;
                  fragmented = 1;
                  break;

            case IPPROTO_MOBILITY_OLD:
            case IPPROTO_MOBILITY:
                  /*
                   * XXX - we don't use "advance"; the current
                   * "Mobility Support in IPv6" draft
                   * (draft-ietf-mobileip-ipv6-24) says that
                   * the next header field in a mobility header
                   * should be IPPROTO_NONE, but speaks of
                   * the possiblity of a future extension in
                   * which payload can be piggybacked atop a
                   * mobility header.
                   */
                  advance = mobility_print(cp, (const u_char *)ip6);
                  nh = *cp;
                  goto end;
            case IPPROTO_ROUTING:
                  advance = rt6_print(cp, (const u_char *)ip6);
                  nh = *cp;
                  break;
            case IPPROTO_SCTP:
                  sctp_print(cp, (const u_char *)ip6, len);
                  goto end;
            case IPPROTO_TCP:
                  tcp_print(cp, len, (const u_char *)ip6, fragmented);
                  goto end;
            case IPPROTO_UDP:
                  udp_print(cp, len, (const u_char *)ip6, fragmented);
                  goto end;
            case IPPROTO_ICMPV6:
                  icmp6_print(cp, len, (const u_char *)ip6, fragmented);
                  goto end;
            case IPPROTO_AH:
                  advance = ah_print(cp);
                  nh = *cp;
                  break;
            case IPPROTO_ESP:
                {
                  int enh, padlen;
                  advance = esp_print(cp, (const u_char *)ip6, &enh, &padlen);
                  nh = enh & 0xff;
                  len -= padlen;
                  break;
                }
            case IPPROTO_IPCOMP:
                {
                  int enh;
                  advance = ipcomp_print(cp, &enh);
                  nh = enh & 0xff;
                  break;
                }

            case IPPROTO_PIM:
                  pim_print(cp, len);
                  goto end;
            case IPPROTO_OSPF:
                  ospf6_print(cp, len);
                  goto end;

            case IPPROTO_IPV6:
                  ip6_print(cp, len);
                  goto end;

            case IPPROTO_IPV4:
                  ip_print(cp, len);
                  goto end;

            case IPPROTO_NONE:
                  (void)printf("no next header");
                  goto end;

            default:
                  (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
                  goto end;
            }
      }

 end:

      flow = EXTRACT_32BITS(&ip6->ip6_flow);
#if 0
      /* rfc1883 */
      if (flow & 0x0f000000)
            (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
      if (flow & 0x00ffffff)
            (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
#else
      /* RFC 2460 */
      if (flow & 0x0ff00000)
            (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
      if (flow & 0x000fffff)
            (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
#endif

      if (ip6->ip6_hlim <= 1)
            (void)printf(" [hlim %u]", ip6->ip6_hlim);

      if (vflag) {
            printf(" (");
            (void)printf("len %u", payload_len);
            if (ip6->ip6_hlim > 1)
                  (void)printf(", hlim %d", (int)ip6->ip6_hlim);
            printf(")");
      }
      return;
trunc:
      (void)printf("[|ip6]");
}

#endif /* INET6 */

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