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print-mobility.c

/*
 * Copyright (C) 2002 WIDE Project.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project 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 BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

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

#ifndef lint
static const char rcsid[] _U_ =
     "@(#) $Header: /tcpdump/master/tcpdump/print-mobility.c,v 1.9.2.2 2003/11/16 08:51:33 guy Exp $";
#endif

#ifdef INET6
#include <tcpdump-stdinc.h>

#include <stdio.h>

#include "ip6.h"

#include "interface.h"
#include "addrtoname.h"
#include "extract.h"          /* must come after interface.h */

/* Mobility header */
struct ip6_mobility {
      u_int8_t ip6m_pproto;   /* following payload protocol (for PG) */
      u_int8_t ip6m_len;      /* length in units of 8 octets */
      u_int8_t ip6m_type;     /* message type */
      u_int8_t reserved;      /* reserved */
      u_int16_t ip6m_cksum;   /* sum of IPv6 pseudo-header and MH */
      union {
            u_int16_t   ip6m_un_data16[1]; /* type-specific field */
            u_int8_t    ip6m_un_data8[2];  /* type-specific fiedl */
      } ip6m_dataun;
};

#define ip6m_data16     ip6m_dataun.ip6m_un_data16
#define ip6m_data8      ip6m_dataun.ip6m_un_data8

#define IP6M_MINLEN     8

/* message type */
#define IP6M_BINDING_REQUEST  0     /* Binding Refresh Request */
#define IP6M_HOME_TEST_INIT   1     /* Home Test Init */
#define IP6M_CAREOF_TEST_INIT 2     /* Care-of Test Init */
#define IP6M_HOME_TEST        3     /* Home Test */
#define IP6M_CAREOF_TEST      4     /* Care-of Test */
#define IP6M_BINDING_UPDATE   5     /* Binding Update */
#define IP6M_BINDING_ACK      6     /* Binding Acknowledgement */
#define IP6M_BINDING_ERROR    7     /* Binding Error */

/* Mobility Header Options */
#define IP6MOPT_MINLEN        2
#define IP6MOPT_PAD1          0x0   /* Pad1 */
#define IP6MOPT_PADN          0x1   /* PadN */
#define IP6MOPT_REFRESH       0x2   /* Binding Refresh Advice */
#define IP6MOPT_REFRESH_MINLEN  4
#define IP6MOPT_ALTCOA        0x3   /* Alternate Care-of Address */
#define IP6MOPT_ALTCOA_MINLEN  18
#define IP6MOPT_NONCEID       0x4   /* Nonce Indices */
#define IP6MOPT_NONCEID_MINLEN  6
#define IP6MOPT_AUTH          0x5   /* Binding Authorization Data */
#define IP6MOPT_AUTH_MINLEN    12

static void
mobility_opt_print(const u_char *bp, int len)
{
      int i;
      int optlen;

      for (i = 0; i < len; i += optlen) {
            if (bp[i] == IP6MOPT_PAD1)
                  optlen = 1;
            else {
                  if (i + 1 < len)
                        optlen = bp[i + 1] + 2;
                  else
                        goto trunc;
            }
            if (i + optlen > len)
                  goto trunc;

            switch (bp[i]) {
            case IP6MOPT_PAD1:
                  printf("(pad1)");
                  break;
            case IP6MOPT_PADN:
                  if (len - i < IP6MOPT_MINLEN) {
                        printf("(padn: trunc)");
                        goto trunc;
                  }
                  printf("(padn)");
                  break;
            case IP6MOPT_REFRESH:
                  if (len - i < IP6MOPT_REFRESH_MINLEN) {
                        printf("(refresh: trunc)");
                        goto trunc;
                  }
                  /* units of 4 secs */
                  printf("(refresh: %d)",
                        EXTRACT_16BITS(&bp[i+2]) << 2);
                  break;
            case IP6MOPT_ALTCOA:
                  if (len - i < IP6MOPT_ALTCOA_MINLEN) {
                        printf("(altcoa: trunc)");
                        goto trunc;
                  }
                  printf("(alt-CoA: %s)", ip6addr_string(&bp[i+2]));
                  break;
            case IP6MOPT_NONCEID:
                  if (len - i < IP6MOPT_NONCEID_MINLEN) {
                        printf("(ni: trunc)");
                        goto trunc;
                  }
                  printf("(ni: ho=0x%04x co=0x%04x)",
                        EXTRACT_16BITS(&bp[i+2]),
                        EXTRACT_16BITS(&bp[i+4]));
                  break;
            case IP6MOPT_AUTH:
                  if (len - i < IP6MOPT_AUTH_MINLEN) {
                        printf("(auth: trunc)");
                        goto trunc;
                  }
                  printf("(auth)");
                  break;
            default:
                  if (len - i < IP6MOPT_MINLEN) {
                        printf("(sopt_type %d: trunc)", bp[i]);
                        goto trunc;
                  }
                  printf("(type-0x%02x: len=%d)", bp[i], bp[i + 1]);
                  break;
            }
      }
      return;

trunc:
      printf("[trunc] ");
}

/*
 * Mobility Header
 */
int
mobility_print(const u_char *bp, const u_char *bp2)
{
      const struct ip6_mobility *mh;
      const struct ip6_hdr *ip6;
      const u_char *ep;
      int mhlen, hlen, type;

      mh = (struct ip6_mobility *)bp;
      ip6 = (struct ip6_hdr *)bp2;

      /* 'ep' points to the end of available data. */
      ep = snapend;

      if (!TTEST(mh->ip6m_len)) {
            /*
             * There's not enough captured data to include the
             * mobility header length.
             *
             * Our caller expects us to return the length, however,
             * so return a value that will run to the end of the
             * captured data.
             *
             * XXX - "ip6_print()" doesn't do anything with the
             * returned length, however, as it breaks out of the
             * header-processing loop.
             */
            mhlen = ep - bp;
            goto trunc;
      }
      mhlen = (int)((mh->ip6m_len + 1) << 3);

      /* XXX ip6m_cksum */

      TCHECK(mh->ip6m_type);
      type = mh->ip6m_type;
      switch (type) {
      case IP6M_BINDING_REQUEST:
            printf("mobility: BRR");
            hlen = IP6M_MINLEN;
            break;
      case IP6M_HOME_TEST_INIT:
      case IP6M_CAREOF_TEST_INIT:
            printf("mobility: %soTI",
                  type == IP6M_HOME_TEST_INIT ? "H" : "C");
            hlen = IP6M_MINLEN;
            if (vflag) {
                  TCHECK2(*mh, hlen + 8);
                  printf(" %s Init Cookie=%08x:%08x",
                         type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of",
                         EXTRACT_32BITS(&bp[hlen]),
                         EXTRACT_32BITS(&bp[hlen + 4]));
            }
            hlen += 8;
            break;
      case IP6M_HOME_TEST:
      case IP6M_CAREOF_TEST:
            printf("mobility: %soT",
                  type == IP6M_HOME_TEST ? "H" : "C");
            TCHECK(mh->ip6m_data16[0]);
            printf(" nonce id=0x%x", EXTRACT_16BITS(&mh->ip6m_data16[0]));
            hlen = IP6M_MINLEN;
            if (vflag) {
                  TCHECK2(*mh, hlen + 8);
                  printf(" %s Init Cookie=%08x:%08x",
                         type == IP6M_HOME_TEST ? "Home" : "Care-of",
                         EXTRACT_32BITS(&bp[hlen]),
                         EXTRACT_32BITS(&bp[hlen + 4]));
            }
            hlen += 8;
            if (vflag) {
                  TCHECK2(*mh, hlen + 8);
                  printf(" %s Keygen Token=%08x:%08x",
                         type == IP6M_HOME_TEST ? "Home" : "Care-of",
                         EXTRACT_32BITS(&bp[hlen]),
                         EXTRACT_32BITS(&bp[hlen + 4]));
            }
            hlen += 8;
            break;
      case IP6M_BINDING_UPDATE:
            printf("mobility: BU");
            TCHECK(mh->ip6m_data16[0]);
            printf(" seq#=%d", EXTRACT_16BITS(&mh->ip6m_data16[0]));
            hlen = IP6M_MINLEN;
            TCHECK2(*mh, hlen + 1);
            if (bp[hlen] & 0xf0)
                  printf(" ");
            if (bp[hlen] & 0x80)
                  printf("A");
            if (bp[hlen] & 0x40)
                  printf("H");
            if (bp[hlen] & 0x20)
                  printf("L");
            if (bp[hlen] & 0x10)
                  printf("K");
            /* Reserved (4bits) */
            hlen += 1;
            /* Reserved (8bits) */
            hlen += 1;
            TCHECK2(*mh, hlen + 2);
            /* units of 4 secs */
            printf(" lifetime=%d", EXTRACT_16BITS(&bp[hlen]) << 2);
            hlen += 2;
            break;
      case IP6M_BINDING_ACK:
            printf("mobility: BA");
            TCHECK(mh->ip6m_data8[0]);
            printf(" status=%d", mh->ip6m_data8[0]);
            if (mh->ip6m_data8[1] & 0x80)
                  printf(" K");
            /* Reserved (7bits) */
            hlen = IP6M_MINLEN;
            TCHECK2(*mh, hlen + 2);
            printf(" seq#=%d", EXTRACT_16BITS(&bp[hlen]));
            hlen += 2;
            TCHECK2(*mh, hlen + 2);
            /* units of 4 secs */
            printf(" lifetime=%d", EXTRACT_16BITS(&bp[hlen]) << 2);
            hlen += 2;
            break;
      case IP6M_BINDING_ERROR:
            printf("mobility: BE");
            TCHECK(mh->ip6m_data8[0]);
            printf(" status=%d", mh->ip6m_data8[0]);
            /* Reserved */
            hlen = IP6M_MINLEN;
            TCHECK2(*mh, hlen + 16);
            printf(" homeaddr %s", ip6addr_string(&bp[hlen]));
            hlen += 16;
            break;
      default:
            printf("mobility: type-#%d len=%d", type, mh->ip6m_len);
            return(mhlen);
            break;
      }
      if (vflag)
            mobility_opt_print(&bp[hlen], mhlen - hlen);

      return(mhlen);

 trunc:
      fputs("[|MOBILITY]", stdout);
      return(mhlen);
}
#endif /* INET6 */

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