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/* packet-bfd.c
* Routines for Bi-directional Fault Detection (BFD) message dissection
*
* Copyright 2003, Hannes Gredler <hannes@juniper.net>
* Copyright 2006, Balint Reczey <Balint.Reczey@ericsson.com>
*
* $Id$
*
* 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
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#define UDP_PORT_BFD_CONTROL 3784 /* draft-katz-ward-bfd-v4v6-1hop-00.txt */
static const value_string bfd_control_v0_diag_values[] = {
{ 0, "No Diagnostic" },
{ 1, "Control Detection Time Expired" },
{ 2, "Echo Function Failed" },
{ 3, "Neighbor Signaled Session Down" },
{ 4, "Forwarding Plane Reset" },
{ 5, "Path Down" },
{ 6, "Concatenated Path Down" },
{ 7, "Administratively Down" },
{ 0, NULL }
};
static const value_string bfd_control_v1_diag_values[] = {
{ 0, "No Diagnostic" },
{ 1, "Control Detection Time Expired" },
{ 2, "Echo Function Failed" },
{ 3, "Neighbor Signaled Session Down" },
{ 4, "Forwarding Plane Reset" },
{ 5, "Path Down" },
{ 6, "Concatenated Path Down" },
{ 7, "Administratively Down" },
{ 8, "Reverse Concatenated Path Down" },
{ 0, NULL }
};
static const value_string bfd_control_sta_values[] = {
{ 0, "AdminDown" },
{ 1, "Down" },
{ 2, "Init" },
{ 3, "Up" },
{ 0, NULL }
};
static gint proto_bfd = -1;
static gint hf_bfd_version = -1;
static gint hf_bfd_diag = -1;
static gint hf_bfd_sta = -1;
static gint hf_bfd_flags = -1;
static gint hf_bfd_flags_h = -1;
static gint hf_bfd_flags_p = -1;
static gint hf_bfd_flags_f = -1;
static gint hf_bfd_flags_c = -1;
static gint hf_bfd_flags_a = -1;
static gint hf_bfd_flags_d = -1;
static gint hf_bfd_flags_d_v0 = -1;
static gint hf_bfd_detect_time_multiplier = -1;
static gint hf_bfd_my_discriminator = -1;
static gint hf_bfd_your_discriminator = -1;
static gint hf_bfd_desired_min_tx_interval = -1;
static gint hf_bfd_required_min_rx_interval = -1;
static gint hf_bfd_required_min_echo_interval = -1;
static gint ett_bfd = -1;
static gint ett_bfd_flags = -1;
/*
* Control packet version 0, draft-katz-ward-bfd-01.txt
*
* 0 1 2 3
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |Vers | Diag |H|D|P|F| Rsvd | Detect Mult | Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | My Discriminator |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Your Discriminator |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Desired Min TX Interval |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Required Min RX Interval |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Required Min Echo RX Interval |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/*
* Control packet version 1, draft-ietf-bfd-base-04.txt
*
* 0 1 2 3
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |Vers | Diag |Sta|P|F|C|A|D|R| Detect Mult | Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | My Discriminator |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Your Discriminator |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Desired Min TX Interval |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Required Min RX Interval |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Required Min Echo RX Interval |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* An optional Authentication Section may be present:
* Dissection is not implemented yet.
* 0 1 2 3
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Auth Type | Auth Len | Authentication Data... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*
*
*/
static void dissect_bfd_control(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
gint bfd_version = -1;
gint bfd_diag = -1;
gint bfd_sta = -1;
gint bfd_flags = -1;
gint bfd_flags_h = -1;
gint bfd_flags_p = -1;
gint bfd_flags_f = -1;
gint bfd_flags_c = -1;
gint bfd_flags_a = -1;
gint bfd_flags_d = -1;
gint bfd_flags_d_v0 = -1;
gint bfd_detect_time_multiplier = -1;
gint bfd_length = -1;
gint bfd_my_discriminator = -1;
gint bfd_your_discriminator = -1;
gint bfd_desired_min_tx_interval = -1;
gint bfd_required_min_rx_interval = -1;
gint bfd_required_min_echo_interval = -1;
proto_item *ti;
proto_tree *bfd_tree;
proto_tree *bfd_flags_tree;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "BFD Control");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
bfd_version = ((tvb_get_guint8(tvb, 0) & 0xe0) >> 5);
bfd_diag = (tvb_get_guint8(tvb, 0) & 0x1f);
switch (bfd_version) {
case 0:
bfd_flags = tvb_get_guint8(tvb, 1 );
bfd_flags_h = (tvb_get_guint8(tvb, 1) & 0x80);
bfd_flags_d_v0 = (tvb_get_guint8(tvb, 1) & 0x40);
break;
case 1:
default:
bfd_sta = (tvb_get_guint8(tvb, 1) & 0xc0);
bfd_flags = (tvb_get_guint8(tvb, 1) & 0x3e);
bfd_flags_p = (tvb_get_guint8(tvb, 1) & 0x20);
bfd_flags_f = (tvb_get_guint8(tvb, 1) & 0x10);
bfd_flags_c = (tvb_get_guint8(tvb, 1) & 0x08);
bfd_flags_a = (tvb_get_guint8(tvb, 1) & 0x04);
bfd_flags_d = (tvb_get_guint8(tvb, 1) & 0x02);
break;
}
bfd_detect_time_multiplier = tvb_get_guint8(tvb, 2);
bfd_length = tvb_get_guint8(tvb, 3);
bfd_my_discriminator = tvb_get_ntohl(tvb, 4);
bfd_your_discriminator = tvb_get_ntohl(tvb, 8);
bfd_desired_min_tx_interval = tvb_get_ntohl(tvb, 12);
bfd_required_min_rx_interval = tvb_get_ntohl(tvb, 16);
bfd_required_min_echo_interval = tvb_get_ntohl(tvb, 20);
if (check_col(pinfo->cinfo, COL_INFO)) {
switch (bfd_version) {
case 0:
col_add_fstr(pinfo->cinfo, COL_INFO, "Diag: %s, Flags: 0x%02x",
val_to_str(bfd_diag, bfd_control_v0_diag_values, "UNKNOWN"),
bfd_flags);
break;
case 1:
default:
col_add_fstr(pinfo->cinfo, COL_INFO, "Diag: %s, State: %s, Flags: 0x%02x",
val_to_str(bfd_diag, bfd_control_v1_diag_values, "UNKNOWN"),
val_to_str(bfd_sta >> 6 , bfd_control_sta_values, "UNKNOWN"),
bfd_flags);
break;
}
}
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_bfd, tvb, 0, -1,
"BFD Control message");
bfd_tree = proto_item_add_subtree(ti, ett_bfd);
ti = proto_tree_add_uint(bfd_tree, hf_bfd_version, tvb, 0,
1, bfd_version << 5);
ti = proto_tree_add_uint(bfd_tree, hf_bfd_diag, tvb, 0,
1, bfd_diag);
switch (bfd_version) {
case 0:
break;
case 1:
default:
ti = proto_tree_add_uint(bfd_tree, hf_bfd_sta, tvb, 1,
1, bfd_sta);
break;
}
switch (bfd_version) {
case 0:
ti = proto_tree_add_text ( bfd_tree, tvb, 1, 1, "Message Flags: 0x%02x",
bfd_flags);
bfd_flags_tree = proto_item_add_subtree(bfd_tree, ett_bfd_flags);
ti = proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_h, tvb, 8, 1, bfd_flags_h);
ti = proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_d_v0, tvb, 8, 1, bfd_flags_d_v0);
break;
case 1:
default:
ti = proto_tree_add_text ( bfd_tree, tvb, 1, 1, "Message Flags: 0x%02x",
bfd_flags);
bfd_flags_tree = proto_item_add_subtree(bfd_tree, ett_bfd_flags);
ti = proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_p, tvb, 6, 1, bfd_flags_p);
ti = proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_f, tvb, 6, 1, bfd_flags_f);
ti = proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_c, tvb, 6, 1, bfd_flags_c);
ti = proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_a, tvb, 6, 1, bfd_flags_a);
ti = proto_tree_add_boolean(bfd_flags_tree, hf_bfd_flags_d, tvb, 6, 1, bfd_flags_d);
break;
}
ti = proto_tree_add_uint_format_value(bfd_tree, hf_bfd_detect_time_multiplier, tvb, 2,
1, bfd_detect_time_multiplier,
"%u (= %u ms Detection time)",
bfd_detect_time_multiplier,
bfd_detect_time_multiplier * bfd_desired_min_tx_interval/1000);
ti = proto_tree_add_text ( bfd_tree, tvb, 3, 1, "Message Length: %u Bytes", bfd_length );
ti = proto_tree_add_uint(bfd_tree, hf_bfd_my_discriminator, tvb, 4,
4, bfd_my_discriminator);
ti = proto_tree_add_uint(bfd_tree, hf_bfd_your_discriminator, tvb, 8,
4, bfd_your_discriminator);
ti = proto_tree_add_uint_format_value(bfd_tree, hf_bfd_desired_min_tx_interval, tvb, 12,
4, bfd_desired_min_tx_interval,
"%4u ms",
bfd_desired_min_tx_interval/1000);
ti = proto_tree_add_uint_format_value(bfd_tree, hf_bfd_required_min_rx_interval, tvb, 16,
4, bfd_required_min_rx_interval,
"%4u ms",
bfd_required_min_rx_interval/1000);
ti = proto_tree_add_uint_format_value(bfd_tree, hf_bfd_required_min_echo_interval, tvb, 20,
4, bfd_required_min_echo_interval,
"%4u ms",
bfd_required_min_echo_interval/1000);
}
return;
}
/* Register the protocol with Wireshark */
void proto_register_bfd(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_bfd_version,
{ "Protocol Version", "bfd.version",
FT_UINT8, BASE_DEC, NULL , 0xe0,
"", HFILL }
},
{ &hf_bfd_diag,
{ "Diagnostic Code", "bfd.diag",
FT_UINT8, BASE_HEX, VALS(bfd_control_v1_diag_values), 0x1f,
"", HFILL }
},
{ &hf_bfd_sta,
{ "Session State", "bfd.sta",
FT_UINT8, BASE_HEX, VALS(bfd_control_sta_values), 0xc0,
"", HFILL }
},
{ &hf_bfd_flags,
{ "Message Flags", "bfd.flags",
FT_UINT8, BASE_HEX, NULL, 0xf0,
"", HFILL }
},
{ &hf_bfd_flags_h,
{ "I hear you", "bfd.flags.h",
FT_BOOLEAN, 8, TFS(&flags_set_truth), 0x80,
"", HFILL }
},
{ &hf_bfd_flags_d_v0,
{ "Demand", "bfd.flags.d",
FT_BOOLEAN, 8, TFS(&flags_set_truth), 0x40,
"", HFILL }
},
{ &hf_bfd_flags_p,
{ "Poll", "bfd.flags.p",
FT_BOOLEAN, 6, TFS(&flags_set_truth), 0x20,
"", HFILL }
},
{ &hf_bfd_flags_f,
{ "Final", "bfd.flags.f",
FT_BOOLEAN, 6, TFS(&flags_set_truth), 0x10,
"", HFILL }
},
{ &hf_bfd_flags_c,
{ "Control Plane Independent", "bfd.flags.c",
FT_BOOLEAN, 6, TFS(&flags_set_truth), 0x08,
"", HFILL }
},
{ &hf_bfd_flags_a,
{ "Authentication Present", "bfd.flags.a",
FT_BOOLEAN, 6, TFS(&flags_set_truth), 0x04,
"", HFILL }
},
{ &hf_bfd_flags_d,
{ "Demand", "bfd.flags.d",
FT_BOOLEAN, 6, TFS(&flags_set_truth), 0x02,
"", HFILL }
},
{ &hf_bfd_detect_time_multiplier,
{ "Detect Time Multiplier", "bfd.detect_time_multiplier",
FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_bfd_my_discriminator,
{ "My Discriminator", "bfd.my_discriminator",
FT_UINT32, BASE_HEX, NULL, 0x0,
"", HFILL }
},
{ &hf_bfd_your_discriminator,
{ "Your Discriminator", "bfd.your_discriminator",
FT_UINT32, BASE_HEX, NULL, 0x0,
"", HFILL }
},
{ &hf_bfd_desired_min_tx_interval,
{ "Desired Min TX Interval", "bfd.desired_min_tx_interval",
FT_UINT32, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_bfd_required_min_rx_interval,
{ "Required Min RX Interval", "bfd.required_min_rx_interval",
FT_UINT32, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_bfd_required_min_echo_interval,
{ "Required Min Echo Interval", "bfd.required_min_echo_interval",
FT_UINT32, BASE_DEC, NULL, 0x0,
"", HFILL }
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_bfd,
&ett_bfd_flags
};
/* Register the protocol name and description */
proto_bfd = proto_register_protocol("Bi-directional Fault Detection Control Message",
"BFD Control",
"bfdcontrol");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_bfd, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_bfd(void)
{
dissector_handle_t bfd_control_handle;
bfd_control_handle = create_dissector_handle(dissect_bfd_control, proto_bfd);
dissector_add("udp.port", UDP_PORT_BFD_CONTROL, bfd_control_handle);
}
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