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packet-aodv.c

/* packet-aodv.c
 * Routines for AODV dissection
 * Copyright 2000, Erik Nordström <erik.nordstrom@it.uu.se>
 *
 * $Id: packet-aodv.c 18196 2006-05-21 04:49:01Z sahlberg $
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

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

#ifdef HAVE_STDDEF_H
#include <stddef.h>
#endif
#include <string.h>

#include <glib.h>

#include <epan/packet.h>

#ifndef offsetof
#define     offsetof(type, member)  ((size_t)(&((type *)0)->member))
#endif

/*
 * See
 *
 *    RFC 3561 (which indicates that, for IPv6, the only change is that
 *    the address fields are enlarged)
 *
 *    http://www.cs.ucsb.edu/~ebelding/txt/aodv6.txt
 *
 *    http://www.tcs.hut.fi/~anttit/manet/drafts/draft-perkins-aodv6-01.txt
 *
 *    (both of the above two are draft-perkins-manet-aodv6-01.txt, which
 *    is from November 2000)
 */

#define INET6_ADDRLEN   16
#define UDP_PORT_AODV   654

/* Message Types */
#define RREQ                  1
#define RREP                  2
#define RERR                  3
#define RREP_ACK        4
#define DRAFT_01_V6_RREQ      16
#define DRAFT_01_V6_RREP      17
#define DRAFT_01_V6_RERR      18
#define DRAFT_01_V6_RREP_ACK  19

/* Extension Types */
#define AODV_EXT  1
#define AODV_EXT_INT    2
#define AODV_EXT_NTP    3

/* Flag bits: */
#define RREQ_UNKNSEQ    0x08
#define RREQ_DESTONLY   0x10
#define RREQ_GRATRREP   0x20
#define RREQ_REP  0x40
#define RREQ_JOIN 0x80

#define RREP_ACK_REQ    0x40
#define RREP_REP  0x80

#define RERR_NODEL      0x80

static const value_string type_vals[] = {
    { RREQ,                 "Route Request" },
    { RREP,                 "Route Reply" },
    { RERR,                 "Route Error" },
    { RREP_ACK,             "Route Reply Acknowledgment"},
    { DRAFT_01_V6_RREQ,     "draft-perkins-manet-aodv6-01 IPv6 Route Request"},
    { DRAFT_01_V6_RREP,     "draft-perkins-manet-aodv6-01 IPv6 Route Reply"},
    { DRAFT_01_V6_RERR,     "draft-perkins-manet-aodv6-01 IPv6 Route Error"},
    { DRAFT_01_V6_RREP_ACK, "draft-perkins-manet-aodv6-01 IPv6 Route Reply Acknowledgment"},
    { 0,                    NULL }
};

static const value_string exttype_vals[] = {
    { AODV_EXT,     "None"},
    { AODV_EXT_INT, "Hello Interval"},
    { AODV_EXT_NTP, "Timestamp"},
    { 0,            NULL}
};

typedef struct v6_ext {
    guint8 type;
    guint8 length;
} aodv_ext_t;

/* Initialize the protocol and registered fields */
static int proto_aodv = -1;
static int hf_aodv_type = -1;
static int hf_aodv_flags = -1;
static int hf_aodv_prefix_sz = -1;
static int hf_aodv_hopcount = -1;
static int hf_aodv_rreq_id = -1;
static int hf_aodv_dest_ip = -1;
static int hf_aodv_dest_ipv6 = -1;
static int hf_aodv_dest_seqno = -1;
static int hf_aodv_orig_ip = -1;
static int hf_aodv_orig_ipv6 = -1;
static int hf_aodv_orig_seqno = -1;
static int hf_aodv_lifetime = -1;
static int hf_aodv_destcount = -1;
static int hf_aodv_unreach_dest_ip = -1;
static int hf_aodv_unreach_dest_ipv6 = -1;
static int hf_aodv_unreach_dest_seqno = -1;
static int hf_aodv_flags_rreq_join = -1;
static int hf_aodv_flags_rreq_repair = -1;
static int hf_aodv_flags_rreq_gratuitous = -1;
static int hf_aodv_flags_rreq_destinationonly = -1;
static int hf_aodv_flags_rreq_unknown = -1;
static int hf_aodv_flags_rrep_repair = -1;
static int hf_aodv_flags_rrep_ack = -1;
static int hf_aodv_flags_rerr_nodelete = -1;
static int hf_aodv_ext_type = -1;
static int hf_aodv_ext_length = -1;
static int hf_aodv_ext_interval = -1;
static int hf_aodv_ext_timestamp = -1;

/* Initialize the subtree pointers */
static gint ett_aodv = -1;
static gint ett_aodv_flags = -1;
static gint ett_aodv_unreach_dest = -1;
static gint ett_aodv_extensions = -1;

/* Code to actually dissect the packets */

static void
dissect_aodv_ext(tvbuff_t * tvb, int offset, proto_tree * tree)
{
    proto_tree *ext_tree;
    proto_item *ti;
    aodv_ext_t aodvext, *ext;
    int len;

    if (!tree)
      return;

  again:
    if ((int) tvb_reported_length(tvb) <= offset)
      return;                 /* No more options left */

    ext = &aodvext;
    tvb_memcpy(tvb, (guint8 *) ext, offset, sizeof(*ext));
    len = ext->length;

    ti = proto_tree_add_text(tree, tvb, offset, sizeof(aodv_ext_t) +
                       len, "Extensions");
    ext_tree = proto_item_add_subtree(ti, ett_aodv_extensions);

    if (len == 0) {
      proto_tree_add_text(ext_tree, tvb,
                      offset + offsetof(aodv_ext_t, length), 1,
                      "Invalid option length: %u", ext->length);
      return;                 /* we must not try to decode this */
    }

    proto_tree_add_text(ext_tree, tvb,
                  offset + offsetof(aodv_ext_t, type), 1,
                  "Type: %u (%s)", ext->type,
                  val_to_str(ext->type, exttype_vals, "Unknown"));
    proto_tree_add_text(ext_tree, tvb,
                  offset + offsetof(aodv_ext_t, length), 1,
                  "Length: %u bytes", ext->length);

    offset += sizeof(aodv_ext_t);

    switch (ext->type) {
    case AODV_EXT_INT:
      proto_tree_add_uint(ext_tree, hf_aodv_ext_interval,
                      tvb, offset, 4, tvb_get_ntohl(tvb, offset));
      break;
    case AODV_EXT_NTP:
      proto_tree_add_item(ext_tree, hf_aodv_ext_timestamp,
                      tvb, offset, 8, FALSE);
      break;
    default:
      break;
    }
    /* If multifield extensions appear, we need more
     * sophisticated handler.  For now, this is okay. */

    offset += ext->length;
    goto again;
}

static void
dissect_aodv_rreq(tvbuff_t *tvb, packet_info *pinfo, proto_tree *aodv_tree,
              proto_item *ti, gboolean is_ipv6)
{
    int offset = 1;
    proto_item *tj;
    proto_tree *aodv_flags_tree;
    guint8 flags;
    guint8 hop_count;
    guint32 rreq_id;
    guint32 dest_addr_v4;
    struct e_in6_addr dest_addr_v6;
    guint32 dest_seqno;
    guint32 orig_addr_v4;
    struct e_in6_addr orig_addr_v6;
    guint32 orig_seqno;
    int extlen;

    flags = tvb_get_guint8(tvb, offset);
    if (aodv_tree) {
      tj = proto_tree_add_text(aodv_tree, tvb, offset, 1, "Flags:");
      aodv_flags_tree = proto_item_add_subtree(tj, ett_aodv_flags);
      proto_tree_add_boolean(aodv_flags_tree, hf_aodv_flags_rreq_join,
                         tvb, offset, 1, flags);
      proto_tree_add_boolean(aodv_flags_tree, hf_aodv_flags_rreq_repair,
                         tvb, offset, 1, flags);
      proto_tree_add_boolean(aodv_flags_tree, hf_aodv_flags_rreq_gratuitous,
                         tvb, offset, 1, flags);
      proto_tree_add_boolean(aodv_flags_tree, hf_aodv_flags_rreq_destinationonly,
                         tvb, offset, 1, flags);
      proto_tree_add_boolean(aodv_flags_tree, hf_aodv_flags_rreq_unknown,
                         tvb, offset, 1, flags);
      if (flags & RREQ_JOIN)
          proto_item_append_text(tj, " J");
      if (flags & RREQ_REP)
          proto_item_append_text(tj, " R");
      if (flags & RREQ_GRATRREP)
          proto_item_append_text(tj, " G");
      if (flags & RREQ_DESTONLY)
          proto_item_append_text(tj, " D");
      if (flags & RREQ_UNKNSEQ)
          proto_item_append_text(tj, " U");
    }
    offset += 2;  /* skip reserved byte */

    hop_count = tvb_get_guint8(tvb, offset);
    if (aodv_tree)
      proto_tree_add_uint(aodv_tree, hf_aodv_hopcount, tvb, offset, 1,
                      hop_count);
    offset += 1;

    rreq_id = tvb_get_ntohl(tvb, offset);
    if (aodv_tree)
      proto_tree_add_uint(aodv_tree, hf_aodv_rreq_id, tvb, offset, 4,
                      rreq_id);
    offset += 4;

    if (is_ipv6) {
      tvb_get_ipv6(tvb, offset, &dest_addr_v6);
      if (aodv_tree) {
          proto_tree_add_ipv6(aodv_tree, hf_aodv_dest_ipv6, tvb, offset,
                        INET6_ADDRLEN, (guint8 *)&dest_addr_v6);
          proto_item_append_text(ti, ", Dest IP: %s",
                           ip6_to_str(&dest_addr_v6));
      }
      if (check_col(pinfo->cinfo, COL_INFO))
          col_append_fstr(pinfo->cinfo, COL_INFO, ", D: %s",
                      ip6_to_str(&dest_addr_v6));
      offset += INET6_ADDRLEN;
    } else {
      dest_addr_v4 = tvb_get_ipv4(tvb, offset);
      if (aodv_tree) {
          proto_tree_add_ipv4(aodv_tree, hf_aodv_dest_ip, tvb, offset, 4,
                        dest_addr_v4);
          proto_item_append_text(ti, ", Dest IP: %s",
                           ip_to_str((guint8 *)&dest_addr_v4));
      }
      if (check_col(pinfo->cinfo, COL_INFO))
          col_append_fstr(pinfo->cinfo, COL_INFO, ", D: %s",
                      ip_to_str((guint8 *)&dest_addr_v4));
      offset += 4;
    }

    dest_seqno = tvb_get_ntohl(tvb, offset);
    if (aodv_tree)
      proto_tree_add_uint(aodv_tree, hf_aodv_dest_seqno, tvb, offset, 4,
                      dest_seqno);
    offset += 4;

    if (is_ipv6) {
      tvb_get_ipv6(tvb, offset, &orig_addr_v6);
      if (aodv_tree) {
          proto_tree_add_ipv6(aodv_tree, hf_aodv_orig_ipv6, tvb, offset,
                        INET6_ADDRLEN, (guint8 *)&orig_addr_v6);
          proto_item_append_text(ti, ", Orig IP: %s",
                           ip6_to_str(&orig_addr_v6));
      }
      if (check_col(pinfo->cinfo, COL_INFO))
          col_append_fstr(pinfo->cinfo, COL_INFO, ", O: %s",
                      ip6_to_str(&orig_addr_v6));
      offset += INET6_ADDRLEN;
    } else {
      orig_addr_v4 = tvb_get_ipv4(tvb, offset);
      if (aodv_tree) {
          proto_tree_add_ipv4(aodv_tree, hf_aodv_orig_ip, tvb, offset, 4,
                        orig_addr_v4);
          proto_item_append_text(ti, ", Orig IP: %s",
                           ip_to_str((guint8 *)&orig_addr_v4));
      }
      if (check_col(pinfo->cinfo, COL_INFO))
          col_append_fstr(pinfo->cinfo, COL_INFO, ", O: %s",
                      ip_to_str((guint8 *)&orig_addr_v4));
      offset += 4;
    }

    orig_seqno = tvb_get_ntohl(tvb, offset);
    if (aodv_tree)
      proto_tree_add_uint(aodv_tree, hf_aodv_orig_seqno, tvb, offset, 4,
                      orig_seqno);
    if (check_col(pinfo->cinfo, COL_INFO))
      col_append_fstr(pinfo->cinfo, COL_INFO, " Id=%u Hcnt=%u DSN=%u OSN=%u",
                  rreq_id,
                  hop_count,
                  dest_seqno,
                  orig_seqno);
    offset += 4;

    if (aodv_tree) {
      extlen = tvb_reported_length_remaining(tvb, offset);
      if (extlen > 0)
          dissect_aodv_ext(tvb, offset, aodv_tree);
    }
}

static void
dissect_aodv_rrep(tvbuff_t *tvb, packet_info *pinfo, proto_tree *aodv_tree,
              proto_item *ti, gboolean is_ipv6)
{
    int offset = 1;
    proto_item *tj;
    proto_tree *aodv_flags_tree;
    guint8 flags;
    guint8 prefix_sz;
    guint8 hop_count;
    guint32 dest_addr_v4;
    struct e_in6_addr dest_addr_v6;
    guint32 dest_seqno;
    guint32 orig_addr_v4;
    struct e_in6_addr orig_addr_v6;
    guint32 lifetime;
    int extlen;

    flags = tvb_get_guint8(tvb, offset);
    if (aodv_tree) {
      tj = proto_tree_add_text(aodv_tree, tvb, offset, 1, "Flags:");
      aodv_flags_tree = proto_item_add_subtree(tj, ett_aodv_flags);
      proto_tree_add_boolean(aodv_flags_tree, hf_aodv_flags_rrep_repair,
                         tvb, offset, 1, flags);
      proto_tree_add_boolean(aodv_flags_tree, hf_aodv_flags_rrep_ack, tvb,
                         offset, 1, flags);
      if (flags & RREP_REP)
          proto_item_append_text(tj, " R");
      if (flags & RREP_ACK_REQ)
          proto_item_append_text(tj, " A");
    }
    offset += 1;

    prefix_sz = tvb_get_guint8(tvb, offset) & 0x1F;
    if (aodv_tree)
      proto_tree_add_uint(aodv_tree, hf_aodv_prefix_sz, tvb, offset, 1,
                      prefix_sz);
    offset += 1;

    hop_count = tvb_get_guint8(tvb, offset);
    if (aodv_tree)
      proto_tree_add_uint(aodv_tree, hf_aodv_hopcount, tvb, offset, 1,
                      hop_count);
    offset += 1;

    if (is_ipv6) {
      tvb_get_ipv6(tvb, offset, &dest_addr_v6);
      if (aodv_tree) {
          proto_tree_add_ipv6(aodv_tree, hf_aodv_dest_ipv6, tvb, offset,
                        INET6_ADDRLEN, (guint8 *)&dest_addr_v6);
          proto_item_append_text(ti, ", Dest IP: %s",
                           ip6_to_str(&dest_addr_v6));
      }
      if (check_col(pinfo->cinfo, COL_INFO))
          col_append_fstr(pinfo->cinfo, COL_INFO, ", D: %s",
                      ip6_to_str(&dest_addr_v6));
      offset += INET6_ADDRLEN;
    } else {
      dest_addr_v4 = tvb_get_ipv4(tvb, offset);
      if (aodv_tree) {
          proto_tree_add_ipv4(aodv_tree, hf_aodv_dest_ip, tvb, offset, 4,
                        dest_addr_v4);
          proto_item_append_text(ti, ", Dest IP: %s",
                           ip_to_str((guint8 *)&dest_addr_v4));
      }
      if (check_col(pinfo->cinfo, COL_INFO))
          col_append_fstr(pinfo->cinfo, COL_INFO, ", D: %s",
                      ip_to_str((guint8 *)&dest_addr_v4));
      offset += 4;
    }

    dest_seqno = tvb_get_ntohl(tvb, offset);
    if (aodv_tree)
      proto_tree_add_uint(aodv_tree, hf_aodv_dest_seqno, tvb, offset, 4,
                      dest_seqno);
    offset += 4;

    if (is_ipv6) {
      tvb_get_ipv6(tvb, offset, &orig_addr_v6);
      if (aodv_tree) {
          proto_tree_add_ipv6(aodv_tree, hf_aodv_orig_ipv6, tvb, offset,
                        INET6_ADDRLEN, (guint8 *)&orig_addr_v6);
          proto_item_append_text(ti, ", Orig IP: %s",
                           ip6_to_str(&orig_addr_v6));
      }
      if (check_col(pinfo->cinfo, COL_INFO))
          col_append_fstr(pinfo->cinfo, COL_INFO, ", O: %s",
                      ip6_to_str(&orig_addr_v6));
      offset += INET6_ADDRLEN;
    } else {
      orig_addr_v4 = tvb_get_ipv4(tvb, offset);
      if (aodv_tree) {
          proto_tree_add_ipv4(aodv_tree, hf_aodv_orig_ip, tvb, offset, 4,
                        orig_addr_v4);
          proto_item_append_text(ti, ", Orig IP: %s",
                           ip_to_str((guint8 *)&orig_addr_v4));
      }
      if (check_col(pinfo->cinfo, COL_INFO))
          col_append_fstr(pinfo->cinfo, COL_INFO, ", O: %s",
                      ip_to_str((guint8 *)&orig_addr_v4));
      offset += 4;
    }

    lifetime = tvb_get_ntohl(tvb, offset);
    if (aodv_tree) {
      proto_tree_add_uint(aodv_tree, hf_aodv_lifetime, tvb, offset, 4,
                      lifetime);
      proto_item_append_text(ti, ", Lifetime=%u", lifetime);
    }
    if (check_col(pinfo->cinfo, COL_INFO))
      col_append_fstr(pinfo->cinfo, COL_INFO, " Hcnt=%u DSN=%u Lifetime=%u",
                  hop_count,
                  dest_seqno,
                  lifetime);
    offset += 4;

    if (aodv_tree) {
      extlen = tvb_reported_length_remaining(tvb, offset);
      if (extlen > 0)
          dissect_aodv_ext(tvb, offset, aodv_tree);
    }
}

static void
dissect_aodv_rerr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *aodv_tree,
              gboolean is_ipv6)
{
    int offset = 1;
    proto_item *tj;
    proto_tree *aodv_flags_tree;
    proto_tree *aodv_unreach_dest_tree;
    guint8 flags;
    guint8 dest_count;
    int i;

    flags = tvb_get_guint8(tvb, offset);
    if (aodv_tree) {
      tj = proto_tree_add_text(aodv_tree, tvb, offset, 1, "Flags:");
      aodv_flags_tree = proto_item_add_subtree(tj, ett_aodv_flags);
      proto_tree_add_boolean(aodv_flags_tree, hf_aodv_flags_rerr_nodelete,
                         tvb, offset, 1, flags);
      if (flags & RERR_NODEL)
          proto_item_append_text(tj, " N");
    }
    offset += 2;  /* skip reserved byte */

    dest_count = tvb_get_guint8(tvb, offset);
    if (aodv_tree)
      proto_tree_add_uint(aodv_tree, hf_aodv_destcount, tvb, offset, 1,
                      dest_count);
    if (check_col(pinfo->cinfo, COL_INFO))
      col_append_fstr(pinfo->cinfo, COL_INFO, ", Dest Count=%u",
                  dest_count);
    offset += 1;

    if (is_ipv6) {
      tj = proto_tree_add_text(aodv_tree, tvb, offset,
                         (INET6_ADDRLEN + 4)*dest_count,
                         "Unreachable Destinations");
      aodv_unreach_dest_tree = proto_item_add_subtree(tj, ett_aodv_unreach_dest);
      for (i = 0; i < dest_count; i++) {
          proto_tree_add_item(aodv_unreach_dest_tree,
                        hf_aodv_unreach_dest_ipv6,
                        tvb, offset, INET6_ADDRLEN, FALSE);
          offset += INET6_ADDRLEN;
          proto_tree_add_item(aodv_unreach_dest_tree, hf_aodv_dest_seqno,
                        tvb, offset, 4, FALSE);
          offset += 4;
      }
    } else {
      tj = proto_tree_add_text(aodv_tree, tvb, offset, (4 + 4)*dest_count,
                         "Unreachable Destinations");
      aodv_unreach_dest_tree = proto_item_add_subtree(tj, ett_aodv_unreach_dest);
      for (i = 0; i < dest_count; i++) {
          proto_tree_add_item(aodv_unreach_dest_tree, hf_aodv_unreach_dest_ip,
                        tvb, offset, 4, FALSE);
          offset += 4;
          proto_tree_add_item(aodv_unreach_dest_tree, hf_aodv_dest_seqno,
                        tvb, offset, 4, FALSE);
          offset += 4;
      }
    }
}

static void
dissect_aodv_draft_01_v6_rreq(tvbuff_t *tvb, packet_info *pinfo,
                        proto_tree *aodv_tree, proto_item *ti)
{
    int offset = 1;
    proto_item *tj;
    proto_tree *aodv_flags_tree;
    guint8 flags;
    guint8 hop_count;
    guint32 rreq_id;
    guint32 dest_seqno;
    guint32 orig_seqno;
    struct e_in6_addr dest_addr_v6;
    struct e_in6_addr orig_addr_v6;
    int extlen;

    flags = tvb_get_guint8(tvb, offset);
    if (aodv_tree) {
      tj = proto_tree_add_text(aodv_tree, tvb, offset, 1, "Flags:");
      aodv_flags_tree = proto_item_add_subtree(tj, ett_aodv_flags);
      proto_tree_add_boolean(aodv_flags_tree, hf_aodv_flags_rreq_join,
                         tvb, offset, 1, flags);
      proto_tree_add_boolean(aodv_flags_tree, hf_aodv_flags_rreq_repair,
                         tvb, offset, 1, flags);
      proto_tree_add_boolean(aodv_flags_tree, hf_aodv_flags_rreq_gratuitous,
                         tvb, offset, 1, flags);
      proto_tree_add_boolean(aodv_flags_tree, hf_aodv_flags_rreq_destinationonly,
                         tvb, offset, 1, flags);
      proto_tree_add_boolean(aodv_flags_tree, hf_aodv_flags_rreq_unknown,
                         tvb, offset, 1, flags);
      if (flags & RREQ_JOIN)
          proto_item_append_text(tj, " J");
      if (flags & RREQ_REP)
          proto_item_append_text(tj, " R");
      if (flags & RREQ_GRATRREP)
          proto_item_append_text(tj, " G");
      if (flags & RREQ_DESTONLY)
          proto_item_append_text(tj, " D");
      if (flags & RREQ_UNKNSEQ)
          proto_item_append_text(tj, " U");
    }
    offset += 2;  /* skip reserved byte */

    hop_count = tvb_get_guint8(tvb, offset);
    if (aodv_tree)
      proto_tree_add_uint(aodv_tree, hf_aodv_hopcount, tvb, offset, 1,
                       hop_count);
    offset += 1;

    rreq_id = tvb_get_ntohl(tvb, offset);
    if (aodv_tree)
      proto_tree_add_uint(aodv_tree, hf_aodv_rreq_id, tvb, offset, 4,
                      rreq_id);
    offset += 4;

    dest_seqno = tvb_get_ntohl(tvb, offset);
    if (aodv_tree)
      proto_tree_add_uint(aodv_tree, hf_aodv_dest_seqno, tvb, offset, 4,
                      dest_seqno);
    offset += 4;

    orig_seqno = tvb_get_ntohl(tvb, offset);
    if (aodv_tree)
      proto_tree_add_uint(aodv_tree, hf_aodv_orig_seqno, tvb, offset, 4,
                      orig_seqno);
    offset += 4;

    tvb_get_ipv6(tvb, offset, &dest_addr_v6);
    if (aodv_tree) {
      proto_tree_add_ipv6(aodv_tree, hf_aodv_dest_ipv6, tvb, offset,
                      INET6_ADDRLEN, (guint8 *)&dest_addr_v6);
      proto_item_append_text(ti, ", Dest IP: %s",
                         ip6_to_str(&dest_addr_v6));
    }
    if (check_col(pinfo->cinfo, COL_INFO))
      col_append_fstr(pinfo->cinfo, COL_INFO, ", D: %s",
                  ip6_to_str(&dest_addr_v6));
    offset += INET6_ADDRLEN;

    tvb_get_ipv6(tvb, offset, &orig_addr_v6);
    if (aodv_tree) {
      proto_tree_add_ipv6(aodv_tree, hf_aodv_orig_ipv6, tvb, offset,
                      INET6_ADDRLEN, (guint8 *)&orig_addr_v6);
      proto_item_append_text(ti, ", Orig IP: %s",
                         ip6_to_str(&orig_addr_v6));
    }
    if (check_col(pinfo->cinfo, COL_INFO))
      col_append_fstr(pinfo->cinfo, COL_INFO,
                  ", O: %s Id=%u Hcnt=%u DSN=%u OSN=%u",
                  ip6_to_str(&orig_addr_v6),
                  rreq_id,
                  hop_count,
                  dest_seqno,
                  orig_seqno);
    offset += INET6_ADDRLEN;

    if (aodv_tree) {
      extlen = tvb_reported_length_remaining(tvb, offset);
      if (extlen > 0)
          dissect_aodv_ext(tvb, offset, aodv_tree);
    }
}

static void
dissect_aodv_draft_01_v6_rrep(tvbuff_t *tvb, packet_info *pinfo,
                        proto_tree *aodv_tree, proto_item *ti)
{
    int offset = 1;
    proto_item *tj;
    proto_tree *aodv_flags_tree;
    guint8 flags;
    guint8 prefix_sz;
    guint8 hop_count;
    guint32 dest_seqno;
    struct e_in6_addr dest_addr_v6;
    struct e_in6_addr orig_addr_v6;
    guint32 lifetime;
    int extlen;

    flags = tvb_get_guint8(tvb, offset);
    if (aodv_tree) {
      tj = proto_tree_add_text(aodv_tree, tvb, offset, 1, "Flags:");
      aodv_flags_tree = proto_item_add_subtree(tj, ett_aodv_flags);
      proto_tree_add_boolean(aodv_flags_tree, hf_aodv_flags_rrep_repair,
                         tvb, offset, 1, flags);
      proto_tree_add_boolean(aodv_flags_tree, hf_aodv_flags_rrep_ack, tvb,
                         offset, 1, flags);
      if (flags & RREP_REP)
          proto_item_append_text(tj, " R");
      if (flags & RREP_ACK_REQ)
          proto_item_append_text(tj, " A");
    }
    offset += 1;

    prefix_sz = tvb_get_guint8(tvb, offset) & 0x7F;
    if (aodv_tree)
      proto_tree_add_uint(aodv_tree, hf_aodv_prefix_sz, tvb, offset, 1,
                      prefix_sz);
    offset += 1;

    hop_count = tvb_get_guint8(tvb, offset);
    if (aodv_tree)
      proto_tree_add_uint(aodv_tree, hf_aodv_hopcount, tvb, offset, 1,
                      hop_count);
    offset += 1;

    dest_seqno = tvb_get_ntohl(tvb, offset);
    if (aodv_tree)
      proto_tree_add_uint(aodv_tree, hf_aodv_dest_seqno, tvb, offset, 4,
                      dest_seqno);
    offset += 4;

    tvb_get_ipv6(tvb, offset, &dest_addr_v6);
    if (aodv_tree) {
      proto_tree_add_ipv6(aodv_tree, hf_aodv_dest_ipv6, tvb, offset,
                      INET6_ADDRLEN, (guint8 *)&dest_addr_v6);
      proto_item_append_text(ti, ", Dest IP: %s",
                         ip6_to_str(&dest_addr_v6));
    }
    if (check_col(pinfo->cinfo, COL_INFO))
      col_append_fstr(pinfo->cinfo, COL_INFO, ", D: %s",
                  ip6_to_str(&dest_addr_v6));
    offset += INET6_ADDRLEN;

    tvb_get_ipv6(tvb, offset, &orig_addr_v6);
    if (aodv_tree) {
      proto_tree_add_ipv6(aodv_tree, hf_aodv_orig_ipv6, tvb, offset,
                      INET6_ADDRLEN, (guint8 *)&orig_addr_v6);
      proto_item_append_text(ti, ", Orig IP: %s",
                         ip6_to_str(&orig_addr_v6));
    }
    if (check_col(pinfo->cinfo, COL_INFO))
      col_append_fstr(pinfo->cinfo, COL_INFO, ", O: %s",
                  ip6_to_str(&orig_addr_v6));
    offset += INET6_ADDRLEN;

    lifetime = tvb_get_ntohl(tvb, offset);
    if (aodv_tree) {
      proto_tree_add_uint(aodv_tree, hf_aodv_lifetime, tvb, offset, 4,
                      lifetime);
      proto_item_append_text(ti, ", Lifetime=%u", lifetime);
    }
    if (check_col(pinfo->cinfo, COL_INFO))
      col_append_fstr(pinfo->cinfo, COL_INFO, " Hcnt=%u DSN=%u Lifetime=%u",
                  hop_count,
                  dest_seqno,
                  lifetime);
    offset += 4;

    if (aodv_tree) {
      extlen = tvb_reported_length_remaining(tvb, offset);
      if (extlen > 0)
          dissect_aodv_ext(tvb, offset, aodv_tree);
    }
}

static void
dissect_aodv_draft_01_v6_rerr(tvbuff_t *tvb, packet_info *pinfo,
                        proto_tree *aodv_tree)
{
    int offset = 1;
    proto_item *tj;
    proto_tree *aodv_flags_tree;
    proto_tree *aodv_unreach_dest_tree;
    guint8 flags;
    guint8 dest_count;
    int i;

    flags = tvb_get_guint8(tvb, offset);
    if (aodv_tree) {
      tj = proto_tree_add_text(aodv_tree, tvb, offset, 1, "Flags:");
      aodv_flags_tree = proto_item_add_subtree(tj, ett_aodv_flags);
      proto_tree_add_boolean(aodv_flags_tree, hf_aodv_flags_rerr_nodelete,
                         tvb, offset, 1, flags);
      if (flags & RERR_NODEL)
          proto_item_append_text(tj, " N");
    }
    offset += 2;  /* skip reserved byte */

    dest_count = tvb_get_guint8(tvb, offset);
    if (aodv_tree)
      proto_tree_add_uint(aodv_tree, hf_aodv_destcount, tvb, offset, 1,
                      dest_count);
    if (check_col(pinfo->cinfo, COL_INFO))
      col_append_fstr(pinfo->cinfo, COL_INFO, ", Dest Count=%u",
                  dest_count);
    offset += 1;

    tj = proto_tree_add_text(aodv_tree, tvb, offset,
                       (4 + INET6_ADDRLEN)*dest_count,
                       "Unreachable Destinations");
    aodv_unreach_dest_tree = proto_item_add_subtree(tj, ett_aodv_unreach_dest);
    for (i = 0; i < dest_count; i++) {
      proto_tree_add_item(aodv_unreach_dest_tree, hf_aodv_dest_seqno,
                      tvb, offset, 4, FALSE);
      offset += 4;
      proto_tree_add_item(aodv_unreach_dest_tree,
                      hf_aodv_unreach_dest_ipv6,
                      tvb, offset, INET6_ADDRLEN, FALSE);
      offset += INET6_ADDRLEN;
    }
}

static int
dissect_aodv(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
    proto_item *ti = NULL;
    proto_tree *aodv_tree = NULL;
    gboolean is_ipv6;
    guint8 type;

/* Make entries in Protocol column and Info column on summary display */
    if (check_col(pinfo->cinfo, COL_PROTOCOL))
      col_set_str(pinfo->cinfo, COL_PROTOCOL, "AODV");

    if (check_col(pinfo->cinfo, COL_INFO))
      col_clear(pinfo->cinfo, COL_INFO);

    /* Is this running over IPv6? */
    is_ipv6 = (pinfo->src.type == AT_IPv6);

    /* Check the type of AODV packet. */
    type = tvb_get_guint8(tvb, 0);
    if (match_strval(type, type_vals) == NULL) {
      /*
       * We assume this is not an AODV packet.
       */
      return 0;
    }

    if (check_col(pinfo->cinfo, COL_INFO))
      col_add_fstr(pinfo->cinfo, COL_INFO, "%s",
                 val_to_str(type, type_vals,
                        "Unknown AODV Packet Type (%u)"));
    if (tree) {
      ti = proto_tree_add_protocol_format(tree, proto_aodv, tvb, 0, -1,
          "Ad hoc On-demand Distance Vector Routing Protocol, %s",
          val_to_str(type, type_vals, "Unknown AODV Packet Type (%u)"));
      aodv_tree = proto_item_add_subtree(ti, ett_aodv);

      proto_tree_add_uint(aodv_tree, hf_aodv_type, tvb, 0, 1, type);
    }

    switch (type) {
    case RREQ:
      dissect_aodv_rreq(tvb, pinfo, aodv_tree, ti, is_ipv6);
      break;
    case RREP:
      dissect_aodv_rrep(tvb, pinfo, aodv_tree, ti, is_ipv6);
      break;
    case RERR:
      dissect_aodv_rerr(tvb, pinfo, aodv_tree, is_ipv6);
      break;
    case RREP_ACK:
      break;
    case DRAFT_01_V6_RREQ:
      dissect_aodv_draft_01_v6_rreq(tvb, pinfo, aodv_tree, ti);
      break;
    case DRAFT_01_V6_RREP:
      dissect_aodv_draft_01_v6_rrep(tvb, pinfo, aodv_tree, ti);
      break;
    case DRAFT_01_V6_RERR:
      dissect_aodv_draft_01_v6_rerr(tvb, pinfo, aodv_tree);
      break;
    case DRAFT_01_V6_RREP_ACK:
      break;
    default:
      proto_tree_add_text(aodv_tree, tvb, 0, -1,
                      "Unknown AODV Packet Type (%u)", type);
    }

    return tvb_length(tvb);
}


/* Register the protocol with Wireshark */
void
proto_register_aodv(void)
{
    static hf_register_info hf[] = {
      { &hf_aodv_type,
        { "Type", "aodv.type",
          FT_UINT8, BASE_DEC, VALS(type_vals), 0x0,
          "AODV packet type", HFILL }
      },
      { &hf_aodv_flags,
        { "Flags", "aodv.flags",
          FT_UINT16, BASE_DEC, NULL, 0x0,
          "Flags", HFILL }
      },
      { &hf_aodv_flags_rreq_join,
        { "RREQ Join", "aodv.flags.rreq_join",
          FT_BOOLEAN, 8, TFS(&flags_set_truth), RREQ_JOIN,
          "", HFILL }
      },
      { &hf_aodv_flags_rreq_repair,
        { "RREQ Repair", "aodv.flags.rreq_repair",
          FT_BOOLEAN, 8, TFS(&flags_set_truth), RREQ_REP,
          "", HFILL }
      },
      { &hf_aodv_flags_rreq_gratuitous,
        { "RREQ Gratuitous RREP", "aodv.flags.rreq_gratuitous",
          FT_BOOLEAN, 8, TFS(&flags_set_truth), RREQ_GRATRREP,
          "", HFILL }
      },
      { &hf_aodv_flags_rreq_destinationonly,
        { "RREQ Destination only", "aodv.flags.rreq_destinationonly",
          FT_BOOLEAN, 8, TFS(&flags_set_truth), RREQ_DESTONLY,
          "", HFILL }
      },
      { &hf_aodv_flags_rreq_unknown,
        { "RREQ Unknown Sequence Number", "aodv.flags.rreq_unknown",
          FT_BOOLEAN, 8, TFS(&flags_set_truth), RREQ_UNKNSEQ,
          "", HFILL }
      },
      { &hf_aodv_flags_rrep_repair,
        { "RREP Repair", "aodv.flags.rrep_repair",
          FT_BOOLEAN, 8, TFS(&flags_set_truth), RREP_REP,
          "", HFILL }
      },
      { &hf_aodv_flags_rrep_ack,
        { "RREP Acknowledgement", "aodv.flags.rrep_ack",
          FT_BOOLEAN, 8, TFS(&flags_set_truth), RREP_ACK_REQ,
          "", HFILL }
      },
      { &hf_aodv_flags_rerr_nodelete,
        { "RERR No Delete", "aodv.flags.rerr_nodelete",
          FT_BOOLEAN, 8, TFS(&flags_set_truth), RERR_NODEL,
          "", HFILL }
      },
      { &hf_aodv_prefix_sz,
        { "Prefix Size", "aodv.prefix_sz",
          FT_UINT8, BASE_DEC, NULL, 0x0,
          "Prefix Size", HFILL }
      },
      { &hf_aodv_hopcount,
        { "Hop Count", "aodv.hopcount",
          FT_UINT8, BASE_DEC, NULL, 0x0,
          "Hop Count", HFILL }
      },
      { &hf_aodv_rreq_id,
        { "RREQ Id", "aodv.rreq_id",
          FT_UINT32, BASE_DEC, NULL, 0x0,
          "RREQ Id", HFILL }
      },
      { &hf_aodv_dest_ip,
        { "Destination IP", "aodv.dest_ip",
          FT_IPv4, BASE_NONE, NULL, 0x0,
          "Destination IP Address", HFILL }
      },
      { &hf_aodv_dest_ipv6,
        { "Destination IPv6", "aodv.dest_ipv6",
          FT_IPv6, BASE_NONE, NULL, 0x0,
          "Destination IPv6 Address", HFILL}
      },
      { &hf_aodv_dest_seqno,
        { "Destination Sequence Number", "aodv.dest_seqno",
          FT_UINT32, BASE_DEC, NULL, 0x0,
          "Destination Sequence Number", HFILL }
      },
      { &hf_aodv_orig_ip,
        { "Originator IP", "aodv.orig_ip",
          FT_IPv4, BASE_NONE, NULL, 0x0,
          "Originator IP Address", HFILL }
      },
      { &hf_aodv_orig_ipv6,
        { "Originator IPv6", "aodv.orig_ipv6",
          FT_IPv6, BASE_NONE, NULL, 0x0,
          "Originator IPv6 Address", HFILL}
      },
      { &hf_aodv_orig_seqno,
        { "Originator Sequence Number", "aodv.orig_seqno",
          FT_UINT32, BASE_DEC, NULL, 0x0,
          "Originator Sequence Number", HFILL }
      },
      { &hf_aodv_lifetime,
        { "Lifetime", "aodv.lifetime",
          FT_UINT32, BASE_DEC, NULL, 0x0,
          "Lifetime", HFILL }
      },
      { &hf_aodv_destcount,
        { "Destination Count", "aodv.destcount",
          FT_UINT8, BASE_DEC, NULL, 0x0,
          "Unreachable Destinations Count", HFILL }
      },
      { &hf_aodv_unreach_dest_ip,
        { "Unreachable Destination IP", "aodv.unreach_dest_ip",
          FT_IPv4, BASE_NONE, NULL, 0x0,
          "Unreachable Destination IP Address", HFILL }
      },
      { &hf_aodv_unreach_dest_ipv6,
        { "Unreachable Destination IPv6", "aodv.unreach_dest_ipv6",
          FT_IPv6, BASE_NONE, NULL, 0x0,
          "Unreachable Destination IPv6 Address", HFILL}
      },
      { &hf_aodv_unreach_dest_seqno,
        { "Unreachable Destination Sequence Number", "aodv.unreach_dest_seqno",
          FT_UINT32, BASE_DEC, NULL, 0x0,
          "Unreachable Destination Sequence Number", HFILL }
      },
      { &hf_aodv_ext_type,
        { "Extension Type", "aodv.ext_type",
          FT_UINT8, BASE_DEC, NULL, 0x0,
          "Extension Format Type", HFILL}
      },
      { &hf_aodv_ext_length,
        { "Extension Length", "aodv.ext_length",
          FT_UINT8, BASE_DEC, NULL, 0x0,
          "Extension Data Length", HFILL}
      },
      { &hf_aodv_ext_interval,
        { "Hello Interval", "aodv.hello_interval",
          FT_UINT32, BASE_DEC, NULL, 0x0,
          "Hello Interval Extension", HFILL}
       },
      { &hf_aodv_ext_timestamp,
        { "Timestamp", "aodv.timestamp",
          FT_UINT64, BASE_DEC, NULL, 0x0,
          "Timestamp Extension", HFILL}
       },
    };

/* Setup protocol subtree array */
    static gint *ett[] = {
      &ett_aodv,
      &ett_aodv_flags,
      &ett_aodv_unreach_dest,
      &ett_aodv_extensions,
    };

/* Register the protocol name and description */
    proto_aodv = proto_register_protocol("Ad hoc On-demand Distance Vector Routing Protocol", "AODV", "aodv");

/* Required function calls to register the header fields and subtrees used */
    proto_register_field_array(proto_aodv, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));
}


void
proto_reg_handoff_aodv(void)
{
    dissector_handle_t aodv_handle;

    aodv_handle = new_create_dissector_handle(dissect_aodv,
                                    proto_aodv);
    dissector_add("udp.port", UDP_PORT_AODV, aodv_handle);
}

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