2001-01-05 19:00:37 +00:00
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/* packet-dec-bpdu.c
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* Routines for DEC BPDU (DEC Spanning Tree Protocol) disassembly
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*
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* Copyright 2001 Paul Ionescu <paul@acorp.ro>
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2002-08-28 21:04:11 +00:00
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*
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2006-05-21 04:49:01 +00:00
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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2001-01-05 19:00:37 +00:00
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* Copyright 1998 Gerald Combs
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2002-08-28 21:04:11 +00:00
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*
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2001-01-05 19:00:37 +00:00
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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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2002-08-28 21:04:11 +00:00
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*
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2001-01-05 19:00:37 +00:00
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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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2002-08-28 21:04:11 +00:00
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*
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2001-01-05 19:00:37 +00:00
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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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2012-06-28 22:56:06 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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2001-01-05 19:00:37 +00:00
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*/
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2012-09-20 02:03:38 +00:00
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#include "config.h"
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2001-01-05 19:00:37 +00:00
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2002-01-21 07:37:49 +00:00
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#include <epan/packet.h>
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2005-09-17 00:02:31 +00:00
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#include <epan/etypes.h>
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#include <epan/ppptypes.h>
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2001-01-05 19:00:37 +00:00
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/* Offsets of fields within a BPDU */
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#define BPDU_DEC_CODE 0
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#define BPDU_TYPE 1
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2012-04-26 16:05:05 +00:00
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#define BPDU_VERSION 2
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2001-01-05 19:00:37 +00:00
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#define BPDU_FLAGS 3
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#define BPDU_ROOT_PRI 4
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#define BPDU_ROOT_MAC 6
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#define BPDU_ROOT_PATH_COST 12
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#define BPDU_BRIDGE_PRI 14
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#define BPDU_BRIDGE_MAC 16
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#define BPDU_PORT_IDENTIFIER 22
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#define BPDU_MESSAGE_AGE 23
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#define BPDU_HELLO_TIME 24
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#define BPDU_MAX_AGE 25
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#define BPDU_FORWARD_DELAY 26
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2012-04-26 16:05:05 +00:00
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#define DEC_BPDU_SIZE 27
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2001-01-07 00:23:03 +00:00
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2002-03-19 08:44:41 +00:00
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/* Flag bits */
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2012-04-26 16:05:05 +00:00
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#define BPDU_FLAGS_SHORT_TIMERS 0x80
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#define BPDU_FLAGS_TCACK 0x02
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#define BPDU_FLAGS_TC 0x01
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2001-01-07 00:23:03 +00:00
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2013-03-17 09:11:21 +00:00
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void proto_register_dec_bpdu(void);
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void proto_reg_handoff_dec_bpdu(void);
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2001-01-05 19:00:37 +00:00
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static int proto_dec_bpdu = -1;
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2002-03-19 08:44:41 +00:00
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static int hf_dec_bpdu_proto_id = -1;
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static int hf_dec_bpdu_type = -1;
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static int hf_dec_bpdu_version_id = -1;
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static int hf_dec_bpdu_flags = -1;
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static int hf_dec_bpdu_flags_short_timers = -1;
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static int hf_dec_bpdu_flags_tcack = -1;
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static int hf_dec_bpdu_flags_tc = -1;
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static int hf_dec_bpdu_root_pri = -1;
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static int hf_dec_bpdu_root_mac = -1;
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static int hf_dec_bpdu_root_cost = -1;
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static int hf_dec_bpdu_bridge_pri = -1;
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static int hf_dec_bpdu_bridge_mac = -1;
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static int hf_dec_bpdu_port_id = -1;
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static int hf_dec_bpdu_msg_age = -1;
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static int hf_dec_bpdu_hello_time = -1;
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static int hf_dec_bpdu_max_age = -1;
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static int hf_dec_bpdu_forward_delay = -1;
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2001-01-05 19:00:37 +00:00
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static gint ett_dec_bpdu = -1;
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2002-03-19 08:44:41 +00:00
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static gint ett_dec_bpdu_flags = -1;
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static const value_string protocol_id_vals[] = {
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2012-04-26 16:05:05 +00:00
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{ 0xe1, "DEC Spanning Tree Protocol" },
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{ 0, NULL }
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2002-03-19 08:44:41 +00:00
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};
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2012-04-26 16:05:05 +00:00
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#define BPDU_TYPE_TOPOLOGY_CHANGE 2
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#define BPDU_TYPE_HELLO 25
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2002-03-19 08:44:41 +00:00
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static const value_string bpdu_type_vals[] = {
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2012-04-26 16:05:05 +00:00
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{ BPDU_TYPE_TOPOLOGY_CHANGE, "Topology Change Notification" },
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{ BPDU_TYPE_HELLO, "Hello Packet" },
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{ 0, NULL }
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2002-03-19 08:44:41 +00:00
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};
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static const char initial_sep[] = " (";
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static const char cont_sep[] = ", ";
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2012-04-26 16:05:05 +00:00
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#define APPEND_BOOLEAN_FLAG(flag, item, string) \
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if(flag){ \
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if(item) \
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proto_item_append_text(item, string, sep); \
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sep = cont_sep; \
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}
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2001-01-05 19:00:37 +00:00
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static void
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2002-03-19 08:44:41 +00:00
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dissect_dec_bpdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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2012-04-26 16:05:05 +00:00
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guint8 bpdu_type;
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guint8 flags;
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proto_tree *bpdu_tree;
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proto_tree *flags_tree;
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proto_item *ti;
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const char *sep;
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2001-01-05 19:00:37 +00:00
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2012-04-26 16:05:05 +00:00
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "DEC_STP");
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col_clear(pinfo->cinfo, COL_INFO);
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2001-01-05 19:00:37 +00:00
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2012-04-26 16:05:05 +00:00
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bpdu_type = tvb_get_guint8(tvb, BPDU_TYPE);
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2002-08-28 21:04:11 +00:00
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2012-04-26 16:05:05 +00:00
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col_add_str(pinfo->cinfo, COL_INFO,
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val_to_str(bpdu_type, bpdu_type_vals,
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"Unknown BPDU type (%u)"));
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2002-08-28 21:04:11 +00:00
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2012-04-26 16:05:05 +00:00
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set_actual_length(tvb, DEC_BPDU_SIZE);
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2001-01-05 19:00:37 +00:00
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2012-04-26 16:05:05 +00:00
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if (tree) {
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ti = proto_tree_add_item(tree, proto_dec_bpdu, tvb, 0, DEC_BPDU_SIZE,
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ENC_NA);
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bpdu_tree = proto_item_add_subtree(ti, ett_dec_bpdu);
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2001-01-05 19:00:37 +00:00
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2012-04-26 16:05:05 +00:00
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proto_tree_add_item(bpdu_tree, hf_dec_bpdu_proto_id, tvb,
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BPDU_DEC_CODE, 1, ENC_BIG_ENDIAN);
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2002-03-19 08:44:41 +00:00
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2012-04-26 16:05:05 +00:00
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proto_tree_add_uint(bpdu_tree, hf_dec_bpdu_type, tvb,
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BPDU_TYPE, 1, bpdu_type);
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2002-03-19 08:44:41 +00:00
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2012-04-26 16:05:05 +00:00
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proto_tree_add_item(bpdu_tree, hf_dec_bpdu_version_id, tvb,
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BPDU_VERSION, 1, ENC_BIG_ENDIAN);
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2002-03-19 08:44:41 +00:00
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2012-04-26 16:05:05 +00:00
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flags = tvb_get_guint8(tvb, BPDU_FLAGS);
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ti = proto_tree_add_uint(bpdu_tree, hf_dec_bpdu_flags, tvb,
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BPDU_FLAGS, 1, flags);
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flags_tree = proto_item_add_subtree(ti, ett_dec_bpdu_flags);
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sep = initial_sep;
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APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_SHORT_TIMERS, ti,
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"%sUse short timers");
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proto_tree_add_boolean(flags_tree, hf_dec_bpdu_flags_short_timers, tvb,
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BPDU_FLAGS, 1, flags);
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APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_TCACK, ti,
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"%sTopology Change Acknowledgment");
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proto_tree_add_boolean(flags_tree, hf_dec_bpdu_flags_tcack, tvb,
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BPDU_FLAGS, 1, flags);
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APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_TC, ti,
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"%sTopology Change");
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proto_tree_add_boolean(flags_tree, hf_dec_bpdu_flags_tc, tvb,
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BPDU_FLAGS, 1, flags);
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if (sep != initial_sep) {
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/* We put something in; put in the terminating ")" */
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proto_item_append_text(ti, ")");
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}
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2001-01-05 19:00:37 +00:00
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2012-04-26 16:05:05 +00:00
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proto_tree_add_item(bpdu_tree, hf_dec_bpdu_root_pri, tvb,
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BPDU_ROOT_PRI, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(bpdu_tree, hf_dec_bpdu_root_mac, tvb,
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BPDU_ROOT_MAC, 6, ENC_NA);
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proto_tree_add_item(bpdu_tree, hf_dec_bpdu_root_cost, tvb,
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BPDU_ROOT_PATH_COST, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(bpdu_tree, hf_dec_bpdu_bridge_pri, tvb,
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BPDU_BRIDGE_PRI, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(bpdu_tree, hf_dec_bpdu_bridge_mac, tvb,
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BPDU_BRIDGE_MAC, 6, ENC_NA);
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proto_tree_add_item(bpdu_tree, hf_dec_bpdu_port_id, tvb,
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BPDU_PORT_IDENTIFIER, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(bpdu_tree, hf_dec_bpdu_msg_age, tvb,
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BPDU_MESSAGE_AGE, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(bpdu_tree, hf_dec_bpdu_hello_time, tvb,
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BPDU_HELLO_TIME, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(bpdu_tree, hf_dec_bpdu_max_age, tvb,
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BPDU_MAX_AGE, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(bpdu_tree, hf_dec_bpdu_forward_delay, tvb,
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BPDU_FORWARD_DELAY, 1, ENC_BIG_ENDIAN);
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2001-01-05 19:00:37 +00:00
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2012-04-26 16:05:05 +00:00
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}
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2001-01-05 19:00:37 +00:00
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}
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void
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proto_register_dec_bpdu(void)
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{
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2002-03-19 08:44:41 +00:00
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2012-04-26 16:05:05 +00:00
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static hf_register_info hf[] = {
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{ &hf_dec_bpdu_proto_id,
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{ "Protocol Identifier", "dec_stp.protocol",
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FT_UINT8, BASE_HEX, VALS(protocol_id_vals), 0x0,
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NULL, HFILL }},
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{ &hf_dec_bpdu_type,
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{ "BPDU Type", "dec_stp.type",
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FT_UINT8, BASE_DEC, VALS(bpdu_type_vals), 0x0,
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NULL, HFILL }},
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{ &hf_dec_bpdu_version_id,
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{ "BPDU Version", "dec_stp.version",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_dec_bpdu_flags,
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{ "BPDU flags", "dec_stp.flags",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_dec_bpdu_flags_short_timers,
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{ "Use short timers", "dec_stp.flags.short_timers",
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FT_BOOLEAN, 8, TFS(&tfs_yes_no), BPDU_FLAGS_SHORT_TIMERS,
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NULL, HFILL }},
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{ &hf_dec_bpdu_flags_tcack,
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{ "Topology Change Acknowledgment", "dec_stp.flags.tcack",
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FT_BOOLEAN, 8, TFS(&tfs_yes_no), BPDU_FLAGS_TCACK,
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NULL, HFILL }},
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{ &hf_dec_bpdu_flags_tc,
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{ "Topology Change", "dec_stp.flags.tc",
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FT_BOOLEAN, 8, TFS(&tfs_yes_no), BPDU_FLAGS_TC,
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NULL, HFILL }},
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{ &hf_dec_bpdu_root_pri,
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{ "Root Priority", "dec_stp.root.pri",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_dec_bpdu_root_mac,
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{ "Root MAC", "dec_stp.root.mac",
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FT_ETHER, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_dec_bpdu_root_cost,
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{ "Root Path Cost", "dec_stp.root.cost",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_dec_bpdu_bridge_pri,
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{ "Bridge Priority", "dec_stp.bridge.pri",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_dec_bpdu_bridge_mac,
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{ "Bridge MAC", "dec_stp.bridge.mac",
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FT_ETHER, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_dec_bpdu_port_id,
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{ "Port identifier", "dec_stp.port",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_dec_bpdu_msg_age,
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{ "Message Age", "dec_stp.msg_age",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_dec_bpdu_hello_time,
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{ "Hello Time", "dec_stp.hello",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_dec_bpdu_max_age,
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{ "Max Age", "dec_stp.max_age",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_dec_bpdu_forward_delay,
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{ "Forward Delay", "dec_stp.forward",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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};
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static gint *ett[] = {
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&ett_dec_bpdu,
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&ett_dec_bpdu_flags,
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};
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2001-01-05 19:00:37 +00:00
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2012-04-26 16:05:05 +00:00
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proto_dec_bpdu = proto_register_protocol("DEC Spanning Tree Protocol",
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"DEC_STP", "dec_stp");
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proto_register_field_array(proto_dec_bpdu, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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2001-01-05 19:00:37 +00:00
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}
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void
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proto_reg_handoff_dec_bpdu(void)
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{
|
2012-04-26 16:05:05 +00:00
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dissector_handle_t dec_bpdu_handle;
|
2001-12-03 04:00:26 +00:00
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|
|
|
2012-04-26 16:05:05 +00:00
|
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|
dec_bpdu_handle = create_dissector_handle(dissect_dec_bpdu,
|
|
|
|
proto_dec_bpdu);
|
|
|
|
dissector_add_uint("ethertype", ETHERTYPE_DEC_LB, dec_bpdu_handle);
|
2013-09-11 21:37:58 +00:00
|
|
|
dissector_add_uint("chdlc.protocol", ETHERTYPE_DEC_LB, dec_bpdu_handle);
|
2012-04-26 16:05:05 +00:00
|
|
|
dissector_add_uint("ppp.protocol", PPP_DEC_LB, dec_bpdu_handle);
|
2001-01-05 19:00:37 +00:00
|
|
|
}
|
2014-09-29 18:42:55 +00:00
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|
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|
|
|
/*
|
|
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|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
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|
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*
|
|
|
|
* Local variables:
|
|
|
|
* c-basic-offset: 4
|
|
|
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* tab-width: 8
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|
|
|
* indent-tabs-mode: nil
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* End:
|
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|
*
|
|
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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|
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
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|
*/
|