forked from osmocom/wireshark
274 lines
10 KiB
C
274 lines
10 KiB
C
/* packet-bfd.c
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* Routines for Bi-directional Fault Detection (BFD) message dissection
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*
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* Copyright 2003, Hannes Gredler <hannes@juniper.net>
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*
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* $Id: packet-bfd.c,v 1.1 2003/11/23 22:00:48 gerald Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#define UDP_PORT_BFD_CONTROL 3784 /* draft-katz-ward-bfd-v4v6-1hop-00.txt */
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static const value_string bfd_control_diag_values[] = {
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{ 0, "No Diagnostic" },
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{ 1, "Control Detection Time Expired" },
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{ 2, "Echo Function Failed" },
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{ 3, "Neighbor Signaled Session Down" },
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{ 4, "Forwarding Plane Reset" },
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{ 5, "Path Down" },
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{ 6, "Concatenated Path Down" },
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{ 7, "Administratively Down" },
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{ 0, NULL }
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};
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static const value_string bfd_control_flag_values[] = {
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{ 0x80, "I Hear You" },
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{ 0x40, "Demand" },
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{ 0x20, "Poll" },
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{ 0x10, "Final" },
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{ 0x08, "Reserved" },
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{ 0x04, "Reserved" },
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{ 0x02, "Reserved" },
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{ 0x01, "Reserved" },
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{ 0, NULL }
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};
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static gint proto_bfd = -1;
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static gint hf_bfd_version = -1;
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static gint hf_bfd_diag = -1;
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static gint hf_bfd_flags = -1;
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static gint hf_bfd_detect_time_multiplier = -1;
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static gint hf_bfd_my_discriminator = -1;
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static gint hf_bfd_your_discriminator = -1;
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static gint hf_bfd_desired_min_tx_interval = -1;
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static gint hf_bfd_required_min_rx_interval = -1;
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static gint hf_bfd_required_min_echo_interval = -1;
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static gint ett_bfd = -1;
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/*
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* Control packet, draft-katz-ward-bfd-01.txt
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |Vers | Diag |H|D|P|F| Rsvd | Detect Mult | Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | My Discriminator |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Your Discriminator |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Desired Min TX Interval |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Required Min RX Interval |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Required Min Echo RX Interval |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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static void dissect_bfd_control(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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gint bfd_version = -1;
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gint bfd_diag = -1;
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gint bfd_flags = -1;
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gint bfd_detect_time_multiplier = -1;
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gint bfd_length = -1;
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gint bfd_my_discriminator = -1;
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gint bfd_your_discriminator = -1;
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gint bfd_desired_min_tx_interval = -1;
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gint bfd_required_min_rx_interval = -1;
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gint bfd_required_min_echo_interval = -1;
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proto_item *ti;
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proto_tree *bfd_tree;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "BFD Control");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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bfd_version = ((tvb_get_guint8(tvb, 0) & 0xe0) >> 5);
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bfd_diag = (tvb_get_guint8(tvb, 0) & 0x1f);
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bfd_flags = tvb_get_guint8(tvb, 1);
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bfd_detect_time_multiplier = tvb_get_guint8(tvb, 2);
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bfd_length = tvb_get_guint8(tvb, 3);
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bfd_my_discriminator = tvb_get_ntohl(tvb, 4);
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bfd_your_discriminator = tvb_get_ntohl(tvb, 8);
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bfd_desired_min_tx_interval = tvb_get_ntohl(tvb, 12);
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bfd_required_min_rx_interval = tvb_get_ntohl(tvb, 16);
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bfd_required_min_echo_interval = tvb_get_ntohl(tvb, 20);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "Diag: %s, Flags: %s",
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val_to_str(bfd_diag, bfd_control_diag_values, "UNKNOWN"),
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decode_enumerated_bitfield(bfd_flags,
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0xf0,
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8,
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bfd_control_flag_values,
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"%s"));
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}
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_bfd, tvb, 0, -1,
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"BFD Control message");
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bfd_tree = proto_item_add_subtree(ti, ett_bfd);
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ti = proto_tree_add_uint(bfd_tree, hf_bfd_version, tvb, 0,
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1, bfd_version);
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ti = proto_tree_add_uint(bfd_tree, hf_bfd_diag, tvb, 0,
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1, bfd_diag);
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ti = proto_tree_add_text ( bfd_tree, tvb, 1, 1, "Message Flags: %s",
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decode_enumerated_bitfield(bfd_flags,
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0xf0,
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8,
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bfd_control_flag_values,
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"%s"));
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ti = proto_tree_add_uint_format(bfd_tree, hf_bfd_detect_time_multiplier, tvb, 2,
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1, bfd_detect_time_multiplier,
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"%s: %u (= %u ms Detection time)",
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proto_registrar_get_nth(hf_bfd_detect_time_multiplier) -> name,
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bfd_detect_time_multiplier,
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bfd_detect_time_multiplier * bfd_desired_min_tx_interval/1000);
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ti = proto_tree_add_text ( bfd_tree, tvb, 3, 1, "Message Length: %u Bytes", bfd_length );
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ti = proto_tree_add_uint(bfd_tree, hf_bfd_my_discriminator, tvb, 4,
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4, bfd_my_discriminator);
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ti = proto_tree_add_uint(bfd_tree, hf_bfd_your_discriminator, tvb, 8,
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4, bfd_your_discriminator);
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ti = proto_tree_add_uint_format(bfd_tree, hf_bfd_desired_min_tx_interval, tvb, 12,
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4, bfd_desired_min_tx_interval,
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"%s: %4u ms",
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proto_registrar_get_nth(hf_bfd_desired_min_tx_interval) -> name,
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bfd_desired_min_tx_interval/1000);
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ti = proto_tree_add_uint_format(bfd_tree, hf_bfd_required_min_rx_interval, tvb, 16,
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4, bfd_required_min_rx_interval,
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"%s: %4u ms",
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proto_registrar_get_nth(hf_bfd_required_min_rx_interval) -> name,
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bfd_required_min_rx_interval/1000);
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ti = proto_tree_add_uint_format(bfd_tree, hf_bfd_required_min_echo_interval, tvb, 20,
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4, bfd_required_min_echo_interval,
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"%s: %4u ms",
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proto_registrar_get_nth(hf_bfd_required_min_echo_interval) -> name,
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bfd_required_min_echo_interval/1000);
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}
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return;
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}
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/* Register the protocol with Ethereal */
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void proto_register_bfd(void)
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{
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/* Setup list of header fields */
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static hf_register_info hf[] = {
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{ &hf_bfd_version,
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{ "Protocol Version", "bfd.version",
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FT_UINT8, BASE_DEC, NULL , 0xe0,
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"", HFILL }
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},
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{ &hf_bfd_diag,
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{ "Diagnostic Code", "bfd.diag",
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FT_UINT8, BASE_HEX, VALS(bfd_control_diag_values), 0x1f,
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"", HFILL }
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},
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{ &hf_bfd_flags,
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{ "Message Flags", "bfd.flags",
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FT_UINT8, BASE_HEX, NULL, 0xf0,
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"", HFILL }
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},
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{ &hf_bfd_detect_time_multiplier,
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{ "Detect Time Multiplier", "bfd.detect_time_multiplier",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_bfd_my_discriminator,
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{ "My Discriminator", "bfd.my_discriminator",
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FT_UINT32, BASE_HEX, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_bfd_your_discriminator,
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{ "Your Discriminator", "bfd.your_discriminator",
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FT_UINT32, BASE_HEX, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_bfd_desired_min_tx_interval,
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{ "Desired Min TX Interval", "bfd.desired_min_tx_interval",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_bfd_required_min_rx_interval,
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{ "Required Min RX Interval", "bfd.required_min_rx_interval",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_bfd_required_min_echo_interval,
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{ "Required Min Echo Interval", "bfd.required_min_echo_interval",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"", HFILL }
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},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_bfd,
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};
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/* Register the protocol name and description */
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proto_bfd = proto_register_protocol("Bi-directional Fault Detection Control Message",
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"BFD Control",
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"bfdcontrol");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_bfd, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_bfd(void)
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{
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dissector_handle_t bfd_control_handle;
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bfd_control_handle = create_dissector_handle(dissect_bfd_control, proto_bfd);
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dissector_add("udp.port", UDP_PORT_BFD_CONTROL, bfd_control_handle);
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}
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