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packet-bat.c

/* packet-bat.c
 * Routines for B.A.T.M.A.N. Layer 3 dissection
 * Copyright 2008-2009 Sven Eckelmann <sven.eckelmann@gmx.de>
 *
 * $Id: packet-bat.c 27588 2009-03-03 19:26:45Z etxrab $
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

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

#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/tap.h>
#include <epan/addr_resolv.h>

#include "packet-bat.h"

/* trees */
static gint ett_bat_batman = -1;
static gint ett_bat_batman_flags = -1;
static gint ett_bat_batman_gwflags = -1;
static gint ett_bat_batman_hna = -1;
static gint ett_bat_gw = -1;
static gint ett_bat_vis = -1;
static gint ett_bat_vis_entry = -1;

/* hfs */
static int hf_bat_batman_version = -1;
static int hf_bat_batman_flags = -1;
static int hf_bat_batman_ttl = -1;
static int hf_bat_batman_gwflags = -1;
static int hf_bat_batman_seqno = -1;
static int hf_bat_batman_gwport = -1;
static int hf_bat_batman_orig = -1;
static int hf_bat_batman_old_orig = -1;
static int hf_bat_batman_tq = -1;
static int hf_bat_batman_hna_len = -1;
static int hf_bat_batman_hna_network = -1;
static int hf_bat_batman_hna_netmask = -1;

static int hf_bat_gw_type = -1;
static int hf_bat_gw_ip = -1;

static int hf_bat_vis_vis_orig = -1;
static int hf_bat_vis_version = -1;
static int hf_bat_vis_gwflags = -1;
static int hf_bat_max_tq_v22 = -1;
static int hf_bat_max_tq_v23 = -1;
static int hf_bat_vis_data_type = -1;
static int hf_bat_vis_netmask = -1;
static int hf_bat_vis_tq_v22 = -1;
static int hf_bat_vis_tq_v23 = -1;
static int hf_bat_vis_data_ip = -1;

/* flags */
static int hf_bat_batman_flags_unidirectional = -1;
static int hf_bat_batman_flags_directlink = -1;

static const value_string gw_packettypenames[] = {
      { TUNNEL_DATA, "DATA" },
      { TUNNEL_IP_REQUEST, "IP_REQUEST" },
      { TUNNEL_IP_INVALID, "IP_INVALID" },
      { TUNNEL_KEEPALIVE_REQUEST, "KEEPALIVE_REQUEST" },
      { TUNNEL_KEEPALIVE_REPLY, "KEEPALIVE_REPLY" },
      { 0, NULL }
};

static const value_string vis_packettypenames[] = {
      { DATA_TYPE_NEIGH, "NEIGH" },
      { DATA_TYPE_SEC_IF, "SEC_IF" },
      { DATA_TYPE_HNA, "HNA" },
      { 0, NULL }
};

/* forward declaration */
void proto_register_bat(void);
void proto_reg_handoff_bat(void);

/* supported packet dissectors */
/* supported packet dissectors */
static void dissect_bat_batman(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
static void dissect_bat_batman_v5(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);

static void dissect_bat_gw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);

static void dissect_bat_vis(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
static void dissect_bat_vis_v22(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
static void dissect_vis_entry_v22(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
static void dissect_bat_vis_v23(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
static void dissect_vis_entry_v23(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);

static void dissect_bat_hna(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);

/* other dissectors */
static dissector_handle_t ip_handle;
static dissector_handle_t data_handle;

static int proto_bat_plugin = -1;

/* tap */
static int bat_tap = -1;
static int bat_follow_tap = -1;

/* values changed by preferences */
static guint global_bat_batman_udp_port = BAT_BATMAN_PORT;
static guint global_bat_gw_udp_port = BAT_GW_PORT;
static guint global_bat_vis_udp_port = BAT_VIS_PORT;



static void dissect_bat_batman(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      guint8 version;

      /* set protocol name */
      if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
            col_set_str(pinfo->cinfo, COL_PROTOCOL, "BAT_BATMAN");
      }

      version = tvb_get_guint8(tvb, 0);
      switch (version) {
      case 5:
            dissect_bat_batman_v5(tvb, pinfo, tree);
            break;
      default:
            if (check_col(pinfo->cinfo, COL_INFO)) {
                  col_clear(pinfo->cinfo, COL_INFO);
                  col_append_fstr(pinfo->cinfo, COL_INFO, "Unsupported Version %d", version);
            }
            call_dissector(data_handle, tvb, pinfo, tree);
            break;
      }
}

static void dissect_bat_gwflags(tvbuff_t *tvb, guint8 gwflags, int offset, proto_item *tgw)
{
      proto_tree *gwflags_tree;
      guint8 s = (gwflags & 0x80) >> 7;
      guint8 downbits = (gwflags & 0x7C) >> 3;
      guint8 upbits = (gwflags & 0x07);
      guint down, up;

      down = 32 * (s + 2) * (1 << downbits);
      up = ((upbits + 1) * down) / 8;

      gwflags_tree =  proto_item_add_subtree(tgw, ett_bat_batman_gwflags);
      proto_tree_add_text(gwflags_tree, tvb, offset, 1, "Download Speed: %dkbit", down);
      proto_tree_add_text(gwflags_tree, tvb, offset, 1, "Upload Speed: %dkbit", up);

}

static void dissect_bat_batman_v5(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      struct batman_packet_v5 *batman_packeth;
      const guint8  *old_orig_addr, *orig_addr;
      guint32 old_orig, orig;
      gint i;

      tvbuff_t *next_tvb;
      guint length_remaining;
      int offset = 0;

      batman_packeth = ep_alloc(sizeof(struct batman_packet_v5));

      batman_packeth->version = tvb_get_guint8(tvb, 0);
      batman_packeth->flags = tvb_get_guint8(tvb, 1);
      batman_packeth->ttl = tvb_get_guint8(tvb, 2);
      batman_packeth->gwflags = tvb_get_guint8(tvb, 3);
      batman_packeth->seqno = tvb_get_ntohs(tvb, 4);
      batman_packeth->gwport = tvb_get_ntohs(tvb, 6);
      orig_addr = tvb_get_ptr(tvb, 8, 4);
      orig = tvb_get_ipv4(tvb, 8);
      SET_ADDRESS(&batman_packeth->orig, AT_IPv4, 4, orig_addr);
      old_orig_addr = tvb_get_ptr(tvb, 12, 4);
      old_orig = tvb_get_ipv4(tvb, 12);
      SET_ADDRESS(&batman_packeth->old_orig, AT_IPv4, 4, old_orig_addr);
      batman_packeth->tq = tvb_get_guint8(tvb, 16);
      batman_packeth->hna_len = tvb_get_guint8(tvb, 17);

      /* Set info column */
      if (check_col(pinfo->cinfo, COL_INFO)) {
            col_clear(pinfo->cinfo, COL_INFO);
            col_append_fstr(pinfo->cinfo, COL_INFO, "Seq=%u",
                            batman_packeth->seqno);
      }

      /* Set tree info */
      if (tree) {
            proto_item *ti = NULL, *tf, *tgw;
            proto_tree *bat_batman_tree = NULL, *flag_tree = NULL;

            if (PTREE_DATA(tree)->visible) {
                  ti = proto_tree_add_protocol_format(tree, proto_bat_plugin, tvb, 0, BATMAN_PACKET_V5_SIZE,
                                                      "B.A.T.M.A.N., Orig: %s (%s)",
                                                      get_hostname(orig), ip_to_str(batman_packeth->orig.data));
            } else {
                  ti = proto_tree_add_item(tree, proto_bat_plugin, tvb, 0, BATMAN_PACKET_V5_SIZE, FALSE);
            }
            bat_batman_tree = proto_item_add_subtree(ti, ett_bat_batman);

            /* items */
            proto_tree_add_item(bat_batman_tree, hf_bat_batman_version, tvb, offset, 1, FALSE);
            offset += 1;

            tf = proto_tree_add_item(bat_batman_tree, hf_bat_batman_flags, tvb, offset, 1, FALSE);
            /* <flags> */
            flag_tree =  proto_item_add_subtree(tf, ett_bat_batman_flags);
            proto_tree_add_boolean(flag_tree, hf_bat_batman_flags_unidirectional, tvb, offset, 1, batman_packeth->flags);
            proto_tree_add_boolean(flag_tree, hf_bat_batman_flags_directlink, tvb, offset, 1, batman_packeth->flags);
            /* </flags> */
            offset += 1;

            proto_tree_add_item(bat_batman_tree, hf_bat_batman_ttl, tvb, offset, 1, FALSE);
            offset += 1;

            tgw = proto_tree_add_item(bat_batman_tree, hf_bat_batman_gwflags, tvb, offset, 1, FALSE);
            dissect_bat_gwflags(tvb, batman_packeth->gwflags, offset, tgw);
            offset += 1;

            proto_tree_add_item(bat_batman_tree, hf_bat_batman_seqno, tvb, offset, 2, FALSE);
            offset += 2;

            proto_tree_add_item(bat_batman_tree, hf_bat_batman_gwport, tvb, offset, 2, FALSE);
            offset += 2;

            proto_tree_add_ipv4(bat_batman_tree, hf_bat_batman_orig, tvb, offset, 4, orig);
            offset += 4;

            proto_tree_add_ipv4(bat_batman_tree, hf_bat_batman_old_orig, tvb, offset, 4,  old_orig);
            offset += 4;

            proto_tree_add_item(bat_batman_tree, hf_bat_batman_tq, tvb, offset, 1, FALSE);
            offset += 1;

            proto_tree_add_item(bat_batman_tree, hf_bat_batman_hna_len, tvb, offset, 1, FALSE);
            offset += 1;

            tap_queue_packet(bat_tap, pinfo, batman_packeth);

            for (i = 0; i < batman_packeth->hna_len; i++) {
                  next_tvb = tvb_new_subset(tvb, offset, 5, 5);

                  if (have_tap_listener(bat_follow_tap)) {
                        tap_queue_packet(bat_follow_tap, pinfo, next_tvb);
                  }

                  dissect_bat_hna(next_tvb, pinfo, bat_batman_tree);
                  offset += 5;
            }
      }

      length_remaining = tvb_reported_length_remaining(tvb, offset);
      if (length_remaining != 0) {
            next_tvb = tvb_new_subset(tvb, offset, -1, -1);

            if (have_tap_listener(bat_follow_tap)) {
                  tap_queue_packet(bat_follow_tap, pinfo, next_tvb);
            }

            dissect_bat_batman(next_tvb, pinfo, tree);
      }
}

static void dissect_bat_hna(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
{
      const guint8  *hna_addr;
      guint32 hna;
      guint8 hna_netmask;

      hna_addr = tvb_get_ptr(tvb, 0, 4);
      hna = tvb_get_ipv4(tvb, 0);
      hna_netmask = tvb_get_guint8(tvb, 4);


      /* Set tree info */
      if (tree) {
            proto_item *ti = NULL;
            proto_tree *bat_batman_hna_tree = NULL;

            if (PTREE_DATA(tree)->visible) {
                  ti = proto_tree_add_protocol_format(tree, proto_bat_plugin, tvb, 0, 5,
                                                      "B.A.T.M.A.N. HNA: %s/%d",
                                                      ip_to_str(hna_addr), hna_netmask);
            } else {
                  ti = proto_tree_add_item(tree, proto_bat_plugin, tvb, 0, 5, FALSE);
            }
            bat_batman_hna_tree = proto_item_add_subtree(ti, ett_bat_batman_hna);

            proto_tree_add_ipv4(bat_batman_hna_tree, hf_bat_batman_hna_network, tvb, 0, 4, hna);
            proto_tree_add_item(bat_batman_hna_tree, hf_bat_batman_hna_netmask, tvb, 4, 1, FALSE);
      }
}


static void dissect_bat_gw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      struct gw_packet *gw_packeth;
      const guint8  *ip_addr;
      guint32 ip;
      int ip_pos;

      tvbuff_t *next_tvb;
      guint length_remaining;
      int offset = 0;

      gw_packeth = ep_alloc(sizeof(struct gw_packet));
      gw_packeth->type = tvb_get_guint8(tvb, 0);

      switch (gw_packeth->type) {
            case TUNNEL_IP_INVALID:
                  ip_pos = 13;
                  break;
            default:
                  ip_pos = 1;
      }
      ip = tvb_get_ipv4(tvb, ip_pos);
      ip_addr = tvb_get_ptr(tvb, ip_pos, 4);

      /* set protocol name */
      if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
            col_set_str(pinfo->cinfo, COL_PROTOCOL, "BAT_GW");
      }

      /* Set info column */
      if (check_col(pinfo->cinfo, COL_INFO)) {
            col_clear(pinfo->cinfo, COL_INFO);
            col_append_fstr(pinfo->cinfo, COL_INFO, "Type=%s",
                            val_to_str(gw_packeth->type, gw_packettypenames, "Unknown (0x%02x)"));
            if (ip != 0) {
                  col_append_fstr(pinfo->cinfo, COL_INFO, " IP: %s (%s)",
                                  get_hostname(ip), ip_to_str(ip_addr));
            }
      }


      /* Set tree info */
      if (tree) {
            proto_item *ti = NULL;
            proto_tree *bat_gw_entry_tree = NULL;

            if (PTREE_DATA(tree)->visible) {
                  ti = proto_tree_add_protocol_format(tree, proto_bat_plugin, tvb, 0, 1,
                                                      "B.A.T.M.A.N. GW [%s]",
                                                      val_to_str(gw_packeth->type, gw_packettypenames, "Unknown (0x%02x)"));
            } else {
                  ti = proto_tree_add_item(tree, proto_bat_plugin, tvb, 0, 1, FALSE);
            }
            bat_gw_entry_tree = proto_item_add_subtree(ti, ett_bat_gw);

            proto_tree_add_item(bat_gw_entry_tree, hf_bat_gw_type, tvb, offset, 1, FALSE);
            offset += 1;

            if (gw_packeth->type != TUNNEL_DATA && ip != 0) {
                  proto_tree_add_ipv4(bat_gw_entry_tree, hf_bat_gw_ip, tvb, ip_pos, 4, ip);
                  offset = ip_pos + 4;
            }
      }

      length_remaining = tvb_reported_length_remaining(tvb, offset);
      if (length_remaining != 0) {
            next_tvb = tvb_new_subset(tvb, offset, -1, -1);

            if (have_tap_listener(bat_follow_tap)) {
                  tap_queue_packet(bat_follow_tap, pinfo, next_tvb);
            }

            if (gw_packeth->type == TUNNEL_DATA) {
                  call_dissector(ip_handle, next_tvb, pinfo, tree);
            } else {
                  call_dissector(data_handle, next_tvb, pinfo, tree);
            }
      }
}

static void dissect_bat_vis(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      guint8 version;

      /* set protocol name */
      if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
            col_set_str(pinfo->cinfo, COL_PROTOCOL, "BAT_VIS");
      }

      version = tvb_get_guint8(tvb, 4);
      switch (version) {
      case 22:
            dissect_bat_vis_v22(tvb, pinfo, tree);
            break;
      case 23:
            dissect_bat_vis_v23(tvb, pinfo, tree);
            break;
      default:
            if (check_col(pinfo->cinfo, COL_INFO)) {
                  col_clear(pinfo->cinfo, COL_INFO);
                  col_append_fstr(pinfo->cinfo, COL_INFO, "Unsupported Version %d", version);
            }
            call_dissector(data_handle, tvb, pinfo, tree);
            break;
      }
}

static void dissect_bat_vis_v22(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      struct vis_packet_v22 *vis_packeth;
      const guint8  *sender_ip_addr;
      guint32 sender_ip;
      proto_tree *bat_vis_tree = NULL;

      tvbuff_t *next_tvb;
      guint length_remaining, i;
      int offset = 0;

      vis_packeth = ep_alloc(sizeof(struct vis_packet_v22));

      sender_ip_addr = tvb_get_ptr(tvb, 0, 4);
      sender_ip = tvb_get_ipv4(tvb, 0);
      SET_ADDRESS(&vis_packeth->sender_ip, AT_IPv4, 4, sender_ip_addr);
      vis_packeth->version = tvb_get_guint8(tvb, 4);
      vis_packeth->gw_class = tvb_get_guint8(tvb, 5);
      vis_packeth->tq_max = tvb_get_ntohs(tvb, 6);

      /* set protocol name */
      if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
            col_set_str(pinfo->cinfo, COL_PROTOCOL, "BAT_VIS");
      }

      /* Set info column */
      if (check_col(pinfo->cinfo, COL_INFO)) {
            col_clear(pinfo->cinfo, COL_INFO);
            col_append_fstr(pinfo->cinfo, COL_INFO, "Src: %s (%s)",
                            get_hostname(sender_ip), ip_to_str(vis_packeth->sender_ip.data));
      }

      /* Set tree info */
      if (tree) {
            proto_item *ti = NULL;

            if (PTREE_DATA(tree)->visible) {
                  ti = proto_tree_add_protocol_format(tree, proto_bat_plugin, tvb, 0, VIS_PACKET_V22_SIZE,
                                                      "B.A.T.M.A.N. Vis, Src: %s (%s)",
                                                      get_hostname(sender_ip), ip_to_str(vis_packeth->sender_ip.data));
            } else {
                  ti = proto_tree_add_item(tree, proto_bat_plugin, tvb, 0, VIS_PACKET_V22_SIZE, FALSE);
            }
            bat_vis_tree = proto_item_add_subtree(ti, ett_bat_vis);

            /* items */
            proto_tree_add_ipv4(bat_vis_tree, hf_bat_vis_vis_orig, tvb, offset, 4, sender_ip);
            offset += 4;

            proto_tree_add_item(bat_vis_tree, hf_bat_vis_version, tvb, offset, 1, FALSE);
            offset += 1;

            proto_tree_add_item(bat_vis_tree, hf_bat_vis_gwflags, tvb, offset, 1, FALSE);
            offset += 1;

            proto_tree_add_item(bat_vis_tree, hf_bat_max_tq_v22, tvb, offset, 2, FALSE);
            offset += 2;
      }

      tap_queue_packet(bat_tap, pinfo, vis_packeth);

      length_remaining = tvb_reported_length_remaining(tvb, offset);

      for (i = 0; i < length_remaining; i += VIS_PACKET_V22_DATA_SIZE) {
            next_tvb = tvb_new_subset(tvb, offset, VIS_PACKET_V22_DATA_SIZE, VIS_PACKET_V22_DATA_SIZE);

            if (have_tap_listener(bat_follow_tap)) {
                  tap_queue_packet(bat_follow_tap, pinfo, next_tvb);
            }

            if (bat_vis_tree != NULL) {
                  dissect_vis_entry_v22(next_tvb, pinfo, tree);
            }

            offset += VIS_PACKET_V22_DATA_SIZE;
      }

      length_remaining = tvb_reported_length_remaining(tvb, offset);
      if (length_remaining != 0) {
            next_tvb = tvb_new_subset(tvb, offset, -1, -1);

            if (have_tap_listener(bat_follow_tap)) {
                  tap_queue_packet(bat_follow_tap, pinfo, next_tvb);
            }

            call_dissector(data_handle, next_tvb, pinfo, tree);
      }
}

static void dissect_vis_entry_v22(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
{
      struct vis_data_v22 *vis_datah;
      const guint8  *ip_addr;
      guint32 ip;

      vis_datah = ep_alloc(sizeof(struct vis_data_v22));
      vis_datah->type = tvb_get_guint8(tvb, 0);
      vis_datah->data = tvb_get_ntohs(tvb, 1);
      ip_addr = tvb_get_ptr(tvb, 3, 4);
      ip = tvb_get_ipv4(tvb, 3);
      SET_ADDRESS(&vis_datah->ip, AT_IPv4, 4, ip_addr);


      /* Set tree info */
      if (tree) {
            proto_item *ti = NULL;
            proto_tree *bat_vis_entry_tree = NULL;

            if (PTREE_DATA(tree)->visible) {
                  ti = proto_tree_add_protocol_format(tree, proto_bat_plugin, tvb, 0, 7,
                                                      "VIS Entry: [%s] %s (%s)",
                                                      val_to_str(vis_datah->type, vis_packettypenames, "Unknown (0x%02x)"),
                                                      get_hostname(ip), ip_to_str(vis_datah->ip.data));
            } else {
                  ti = proto_tree_add_item(tree, proto_bat_plugin, tvb, 0, 7, FALSE);
            }
            bat_vis_entry_tree = proto_item_add_subtree(ti, ett_bat_vis_entry);

            proto_tree_add_item(bat_vis_entry_tree, hf_bat_vis_data_type, tvb, 0, 1, FALSE);

            switch (vis_datah->type) {
            case DATA_TYPE_NEIGH:
                  proto_tree_add_item(bat_vis_entry_tree, hf_bat_vis_tq_v22, tvb, 1, 2, FALSE);
                  break;
            case DATA_TYPE_HNA:
                  proto_tree_add_item(bat_vis_entry_tree, hf_bat_vis_netmask, tvb, 1, 1, FALSE);
                  break;
            case DATA_TYPE_SEC_IF:
            default:
                  break;
            }
            proto_tree_add_ipv4(bat_vis_entry_tree, hf_bat_vis_data_ip, tvb, 3, 4,  ip);
      }
}

static void dissect_bat_vis_v23(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      struct vis_packet_v23 *vis_packeth;
      const guint8  *sender_ip_addr;
      guint32 sender_ip;
      proto_tree *bat_vis_tree = NULL;

      tvbuff_t *next_tvb;
      guint length_remaining, i;
      int offset = 0;

      vis_packeth = ep_alloc(sizeof(struct vis_packet_v23));

      sender_ip_addr = tvb_get_ptr(tvb, 0, 4);
      sender_ip = tvb_get_ipv4(tvb, 0);
      SET_ADDRESS(&vis_packeth->sender_ip, AT_IPv4, 4, sender_ip_addr);
      vis_packeth->version = tvb_get_guint8(tvb, 4);
      vis_packeth->gw_class = tvb_get_guint8(tvb, 5);
      vis_packeth->tq_max = tvb_get_guint8(tvb, 6);

      /* set protocol name */
      if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
            col_set_str(pinfo->cinfo, COL_PROTOCOL, "BAT_VIS");
      }

      /* Set info column */
      if (check_col(pinfo->cinfo, COL_INFO)) {
            col_clear(pinfo->cinfo, COL_INFO);
            col_append_fstr(pinfo->cinfo, COL_INFO, "Src: %s (%s)",
                            get_hostname(sender_ip), ip_to_str(vis_packeth->sender_ip.data));
      }

      /* Set tree info */
      if (tree) {
            proto_item *ti = NULL;

            if (PTREE_DATA(tree)->visible) {
                  ti = proto_tree_add_protocol_format(tree, proto_bat_plugin, tvb, 0, VIS_PACKET_V23_SIZE,
                                                      "B.A.T.M.A.N. Vis, Src: %s (%s)",
                                                      get_hostname(sender_ip), ip_to_str(vis_packeth->sender_ip.data));
            } else {
                  ti = proto_tree_add_item(tree, proto_bat_plugin, tvb, 0, VIS_PACKET_V23_SIZE, FALSE);
            }
            bat_vis_tree = proto_item_add_subtree(ti, ett_bat_vis);

            /* items */
            proto_tree_add_ipv4(bat_vis_tree, hf_bat_vis_vis_orig, tvb, offset, 4, sender_ip);
            offset += 4;

            proto_tree_add_item(bat_vis_tree, hf_bat_vis_version, tvb, offset, 1, FALSE);
            offset += 1;

            proto_tree_add_item(bat_vis_tree, hf_bat_vis_gwflags, tvb, offset, 1, FALSE);
            offset += 1;

            proto_tree_add_item(bat_vis_tree, hf_bat_max_tq_v23, tvb, offset, 1, FALSE);
            offset += 1;
      }

      tap_queue_packet(bat_tap, pinfo, vis_packeth);

      length_remaining = tvb_reported_length_remaining(tvb, offset);

      for (i = 0; i < length_remaining; i += VIS_PACKET_V23_DATA_SIZE) {
            next_tvb = tvb_new_subset(tvb, offset, VIS_PACKET_V23_DATA_SIZE, VIS_PACKET_V23_DATA_SIZE);

            if (have_tap_listener(bat_follow_tap)) {
                  tap_queue_packet(bat_follow_tap, pinfo, next_tvb);
            }

            if (bat_vis_tree != NULL) {
                  dissect_vis_entry_v23(next_tvb, pinfo, tree);
            }

            offset += VIS_PACKET_V23_DATA_SIZE;
      }

      length_remaining = tvb_reported_length_remaining(tvb, offset);
      if (length_remaining != 0) {
            next_tvb = tvb_new_subset(tvb, offset, -1, -1);

            if (have_tap_listener(bat_follow_tap)) {
                  tap_queue_packet(bat_follow_tap, pinfo, next_tvb);
            }

            call_dissector(data_handle, next_tvb, pinfo, tree);
      }
}

static void dissect_vis_entry_v23(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
{
      struct vis_data_v23 *vis_datah;
      const guint8  *ip_addr;
      guint32 ip;

      vis_datah = ep_alloc(sizeof(struct vis_data_v23));
      vis_datah->type = tvb_get_guint8(tvb, 0);
      vis_datah->data = tvb_get_guint8(tvb, 1);
      ip_addr = tvb_get_ptr(tvb, 2, 4);
      ip = tvb_get_ipv4(tvb, 2);
      SET_ADDRESS(&vis_datah->ip, AT_IPv4, 4, ip_addr);


      /* Set tree info */
      if (tree) {
            proto_item *ti = NULL;
            proto_tree *bat_vis_entry_tree = NULL;

            if (PTREE_DATA(tree)->visible) {
                  ti = proto_tree_add_protocol_format(tree, proto_bat_plugin, tvb, 0, 7,
                                                      "VIS Entry: [%s] %s (%s)",
                                                      val_to_str(vis_datah->type, vis_packettypenames, "Unknown (0x%02x)"),
                                                      get_hostname(ip), ip_to_str(vis_datah->ip.data));
            } else {
                  ti = proto_tree_add_item(tree, proto_bat_plugin, tvb, 0, 7, FALSE);
            }
            bat_vis_entry_tree = proto_item_add_subtree(ti, ett_bat_vis_entry);

            proto_tree_add_item(bat_vis_entry_tree, hf_bat_vis_data_type, tvb, 0, 1, FALSE);

            switch (vis_datah->type) {
            case DATA_TYPE_NEIGH:
                  proto_tree_add_item(bat_vis_entry_tree, hf_bat_vis_tq_v23, tvb, 1, 1, FALSE);
                  break;
            case DATA_TYPE_HNA:
                  proto_tree_add_item(bat_vis_entry_tree, hf_bat_vis_netmask, tvb, 1, 1, FALSE);
                  break;
            case DATA_TYPE_SEC_IF:
            default:
                  break;
            }
            proto_tree_add_ipv4(bat_vis_entry_tree, hf_bat_vis_data_ip, tvb, 2, 4,  ip);
      }
}

void proto_register_bat(void)
{
      module_t *bat_module = NULL;

      static hf_register_info hf[] = {
            { &hf_bat_batman_version,
              { "Version", "bat.batman.version",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_batman_flags,
              { "Flags", "bat.batman.flags",
                FT_UINT8, BASE_HEX, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_batman_ttl,
              { "Time to Live", "bat.batman.ttl",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_batman_gwflags,
              { "Gateway Flags", "bat.batman.gwflags",
                FT_UINT8, BASE_HEX, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_batman_seqno,
              { "Sequence number", "bat.batman.seq",
                FT_UINT16, BASE_DEC, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_batman_gwport,
              { "Gateway Port", "bat.batman.gwport",
                FT_UINT16, BASE_DEC, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_batman_orig,
              { "Originator", "bat.batman.orig",
                FT_IPv4, BASE_NONE, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_batman_old_orig,
              { "Received from", "bat.batman.old_orig",
                FT_IPv4, BASE_NONE, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_batman_tq,
              { "Transmission Quality", "bat.batman.tq",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_batman_hna_len,
              { "Number of HNAs", "bat.batman.hna_len",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_batman_flags_unidirectional,
              { "Unidirectional", "bat.batman.flags.unidirectional",
                FT_BOOLEAN, 8, TFS(&flags_set_truth), 0x80,
                "", HFILL }
            },
            { &hf_bat_batman_flags_directlink,
              { "DirectLink", "bat.batman.flags.directlink",
                FT_BOOLEAN, 8, TFS(&flags_set_truth), 0x40,
                "", HFILL }
            },
            { &hf_bat_batman_hna_network,
              { "HNA Network", "bat.batman.hna_network",
                FT_IPv4, BASE_NONE, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_batman_hna_netmask,
              { "HNA Netmask", "bat.batman.hna_netmask",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_gw_type,
              { "Type", "bat.gw.type",
                FT_UINT8, BASE_DEC, VALS(gw_packettypenames), 0x0,
                "", HFILL }
            },
            { &hf_bat_gw_ip,
              { "IP", "bat.gw.ip",
                FT_IPv4, BASE_NONE, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_vis_vis_orig,
              { "Originator", "bat.vis.sender_ip",
                FT_IPv4, BASE_NONE, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_vis_version,
              { "Version", "bat.vis.version",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_vis_gwflags,
              { "Gateway Flags", "bat.vis.gwflags",
                FT_UINT8, BASE_HEX, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_max_tq_v22,
              { "Maximum Transmission Quality", "bat.vis.tq_max",
                FT_UINT16, BASE_DEC, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_max_tq_v23,
              { "Maximum Transmission Quality", "bat.vis.tq_max",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                "", HFILL }
            },
            { &hf_bat_vis_data_type,
              { "Type", "bat.vis.data_type",
                FT_UINT8, BASE_DEC, VALS(vis_packettypenames), 0x0,
                "", HFILL }
            },
            { &hf_bat_vis_tq_v22,
              { "Transmission Quality", "bat.vis.tq",
                FT_UINT16, BASE_DEC, NULL, 0x0,
                "", HFILL}
            },
            { &hf_bat_vis_tq_v23,
              { "Transmission Quality", "bat.vis.tq",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                "", HFILL}
            },
            { &hf_bat_vis_netmask,
              { "Netmask", "bat.vis.netmask",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                "", HFILL}
            },
            { &hf_bat_vis_data_ip,
              { "IP", "bat.vis.data_ip",
                FT_IPv4, BASE_NONE, NULL, 0x0,
                "", HFILL }
            }
      };

      /* Setup protocol subtree array */
      static gint *ett[] = {
            &ett_bat_batman,
            &ett_bat_batman_flags,
            &ett_bat_batman_gwflags,
            &ett_bat_batman_hna,
            &ett_bat_gw,
            &ett_bat_vis,
            &ett_bat_vis_entry
      };

      proto_bat_plugin = proto_register_protocol(
                                 "B.A.T.M.A.N. Layer 3 Protocol",
                                 "BAT",          /* short name */
                                 "bat"           /* abbrev */
                         );

      /* Register our configuration options for B.A.T.M.A.N. */
      bat_module = prefs_register_protocol(proto_bat_plugin, proto_reg_handoff_bat);

      proto_register_field_array(proto_bat_plugin, hf, array_length(hf));
      proto_register_subtree_array(ett, array_length(ett));

      prefs_register_uint_preference(bat_module, "batman.bat.port", "BAT UDP Port",
                                     "Set the port for B.A.T.M.A.N. BAT "
                                     "messages (if other than the default of 4305)",
                                     10, &global_bat_batman_udp_port);
      prefs_register_uint_preference(bat_module, "batman.gw.port", "GW UDP Port",
                                     "Set the port for B.A.T.M.A.N. Gateway "
                                     "messages (if other than the default of 4306)",
                                     10, &global_bat_gw_udp_port);
      prefs_register_uint_preference(bat_module, "batman.vis.port", "VIS UDP Port",
                                     "Set the port for B.A.T.M.A.N. VIS "
                                     "messages (if other than the default of 4307)",
                                     10, &global_bat_vis_udp_port);
}

void proto_reg_handoff_bat(void)
{
      static gboolean inited = FALSE;
      static dissector_handle_t batman_handle;
      static dissector_handle_t gw_handle;
      static dissector_handle_t vis_handle;
      static guint batman_udp_port;
      static guint gw_udp_port;
      static guint vis_udp_port;

      if (!inited) {
            bat_tap = register_tap("batman");
            bat_follow_tap = register_tap("batman_follow");

            batman_handle = create_dissector_handle(dissect_bat_batman, proto_bat_plugin);
            gw_handle = create_dissector_handle(dissect_bat_gw, proto_bat_plugin);
            vis_handle = create_dissector_handle(dissect_bat_vis, proto_bat_plugin);

            ip_handle = find_dissector("ip");
            data_handle = find_dissector("data");

            inited = TRUE;
      } else {
            dissector_delete("udp.port", batman_udp_port, batman_handle);
            dissector_delete("udp.port", gw_udp_port, gw_handle);
            dissector_delete("udp.port", vis_udp_port, vis_handle);
      }

      batman_udp_port = global_bat_batman_udp_port;
      gw_udp_port = global_bat_gw_udp_port;
      vis_udp_port = global_bat_vis_udp_port;
      dissector_add("udp.port", batman_udp_port, batman_handle);
      dissector_add("udp.port", gw_udp_port, gw_handle);
      dissector_add("udp.port", vis_udp_port, vis_handle);
}

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