![Guy Harris](/assets/img/avatar_default.png)
keys to have _uint in their names, to match the routines that handle dissector tables with string keys. (Using _port can confuse people into thinking they're intended solely for use with TCP/UDP/etc. ports when, in fact, they work better for things such as Ethernet types, where the binding of particular values to particular protocols are a lot stronger.) svn path=/trunk/; revision=35224
290 lines
9.2 KiB
C
290 lines
9.2 KiB
C
/* packet-dec-bpdu.c
|
|
* Routines for DEC BPDU (DEC Spanning Tree Protocol) disassembly
|
|
*
|
|
* $Id$
|
|
*
|
|
* Copyright 2001 Paul Ionescu <paul@acorp.ro>
|
|
*
|
|
* 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 <glib.h>
|
|
#include <epan/packet.h>
|
|
#include <epan/addr_resolv.h>
|
|
#include <epan/etypes.h>
|
|
#include <epan/ppptypes.h>
|
|
|
|
/* Offsets of fields within a BPDU */
|
|
|
|
#define BPDU_DEC_CODE 0
|
|
#define BPDU_TYPE 1
|
|
#define BPDU_VERSION 2
|
|
#define BPDU_FLAGS 3
|
|
#define BPDU_ROOT_PRI 4
|
|
#define BPDU_ROOT_MAC 6
|
|
#define BPDU_ROOT_PATH_COST 12
|
|
#define BPDU_BRIDGE_PRI 14
|
|
#define BPDU_BRIDGE_MAC 16
|
|
#define BPDU_PORT_IDENTIFIER 22
|
|
#define BPDU_MESSAGE_AGE 23
|
|
#define BPDU_HELLO_TIME 24
|
|
#define BPDU_MAX_AGE 25
|
|
#define BPDU_FORWARD_DELAY 26
|
|
|
|
#define DEC_BPDU_SIZE 27
|
|
|
|
/* Flag bits */
|
|
|
|
#define BPDU_FLAGS_SHORT_TIMERS 0x80
|
|
#define BPDU_FLAGS_TCACK 0x02
|
|
#define BPDU_FLAGS_TC 0x01
|
|
|
|
static int proto_dec_bpdu = -1;
|
|
static int hf_dec_bpdu_proto_id = -1;
|
|
static int hf_dec_bpdu_type = -1;
|
|
static int hf_dec_bpdu_version_id = -1;
|
|
static int hf_dec_bpdu_flags = -1;
|
|
static int hf_dec_bpdu_flags_short_timers = -1;
|
|
static int hf_dec_bpdu_flags_tcack = -1;
|
|
static int hf_dec_bpdu_flags_tc = -1;
|
|
static int hf_dec_bpdu_root_pri = -1;
|
|
static int hf_dec_bpdu_root_mac = -1;
|
|
static int hf_dec_bpdu_root_cost = -1;
|
|
static int hf_dec_bpdu_bridge_pri = -1;
|
|
static int hf_dec_bpdu_bridge_mac = -1;
|
|
static int hf_dec_bpdu_port_id = -1;
|
|
static int hf_dec_bpdu_msg_age = -1;
|
|
static int hf_dec_bpdu_hello_time = -1;
|
|
static int hf_dec_bpdu_max_age = -1;
|
|
static int hf_dec_bpdu_forward_delay = -1;
|
|
|
|
static gint ett_dec_bpdu = -1;
|
|
static gint ett_dec_bpdu_flags = -1;
|
|
|
|
static const value_string protocol_id_vals[] = {
|
|
{ 0xe1, "DEC Spanning Tree Protocol" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
#define BPDU_TYPE_TOPOLOGY_CHANGE 2
|
|
#define BPDU_TYPE_HELLO 25
|
|
|
|
static const value_string bpdu_type_vals[] = {
|
|
{ BPDU_TYPE_TOPOLOGY_CHANGE, "Topology Change Notification" },
|
|
{ BPDU_TYPE_HELLO, "Hello Packet" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const char initial_sep[] = " (";
|
|
static const char cont_sep[] = ", ";
|
|
|
|
#define APPEND_BOOLEAN_FLAG(flag, item, string) \
|
|
if(flag){ \
|
|
if(item) \
|
|
proto_item_append_text(item, string, sep); \
|
|
sep = cont_sep; \
|
|
}
|
|
|
|
static void
|
|
dissect_dec_bpdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
guint8 protocol_version;
|
|
guint8 bpdu_type;
|
|
guint8 flags;
|
|
proto_tree *bpdu_tree;
|
|
proto_tree *flags_tree;
|
|
proto_item *ti;
|
|
const char *sep;
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DEC_STP");
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
bpdu_type = tvb_get_guint8(tvb, BPDU_TYPE);
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_str(pinfo->cinfo, COL_INFO,
|
|
val_to_str(bpdu_type, bpdu_type_vals,
|
|
"Unknown BPDU type (%u)"));
|
|
}
|
|
|
|
set_actual_length(tvb, DEC_BPDU_SIZE);
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_dec_bpdu, tvb, 0, DEC_BPDU_SIZE,
|
|
FALSE);
|
|
bpdu_tree = proto_item_add_subtree(ti, ett_dec_bpdu);
|
|
|
|
protocol_version = tvb_get_guint8(tvb, BPDU_VERSION);
|
|
|
|
proto_tree_add_item(bpdu_tree, hf_dec_bpdu_proto_id, tvb,
|
|
BPDU_DEC_CODE, 1, FALSE);
|
|
|
|
proto_tree_add_uint(bpdu_tree, hf_dec_bpdu_type, tvb,
|
|
BPDU_TYPE, 1, bpdu_type);
|
|
|
|
proto_tree_add_item(bpdu_tree, hf_dec_bpdu_version_id, tvb,
|
|
BPDU_VERSION, 1, FALSE);
|
|
|
|
flags = tvb_get_guint8(tvb, BPDU_FLAGS);
|
|
ti = proto_tree_add_uint(bpdu_tree, hf_dec_bpdu_flags, tvb,
|
|
BPDU_FLAGS, 1, flags);
|
|
flags_tree = proto_item_add_subtree(ti, ett_dec_bpdu_flags);
|
|
sep = initial_sep;
|
|
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_SHORT_TIMERS, ti,
|
|
"%sUse short timers");
|
|
proto_tree_add_boolean(flags_tree, hf_dec_bpdu_flags_short_timers, tvb,
|
|
BPDU_FLAGS, 1, flags);
|
|
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_TCACK, ti,
|
|
"%sTopology Change Acknowledgment");
|
|
proto_tree_add_boolean(flags_tree, hf_dec_bpdu_flags_tcack, tvb,
|
|
BPDU_FLAGS, 1, flags);
|
|
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_TC, ti,
|
|
"%sTopology Change");
|
|
proto_tree_add_boolean(flags_tree, hf_dec_bpdu_flags_tc, tvb,
|
|
BPDU_FLAGS, 1, flags);
|
|
if (sep != initial_sep) {
|
|
/* We put something in; put in the terminating ")" */
|
|
proto_item_append_text(ti, ")");
|
|
}
|
|
|
|
proto_tree_add_item(bpdu_tree, hf_dec_bpdu_root_pri, tvb,
|
|
BPDU_ROOT_PRI, 2, FALSE);
|
|
proto_tree_add_item(bpdu_tree, hf_dec_bpdu_root_mac, tvb,
|
|
BPDU_ROOT_MAC, 6, FALSE);
|
|
proto_tree_add_item(bpdu_tree, hf_dec_bpdu_root_cost, tvb,
|
|
BPDU_ROOT_PATH_COST, 2, FALSE);
|
|
proto_tree_add_item(bpdu_tree, hf_dec_bpdu_bridge_pri, tvb,
|
|
BPDU_BRIDGE_PRI, 2, FALSE);
|
|
proto_tree_add_item(bpdu_tree, hf_dec_bpdu_bridge_mac, tvb,
|
|
BPDU_BRIDGE_MAC, 6, FALSE);
|
|
proto_tree_add_item(bpdu_tree, hf_dec_bpdu_port_id, tvb,
|
|
BPDU_PORT_IDENTIFIER, 1, FALSE);
|
|
proto_tree_add_item(bpdu_tree, hf_dec_bpdu_msg_age, tvb,
|
|
BPDU_MESSAGE_AGE, 1, FALSE);
|
|
proto_tree_add_item(bpdu_tree, hf_dec_bpdu_hello_time, tvb,
|
|
BPDU_HELLO_TIME, 1, FALSE);
|
|
proto_tree_add_item(bpdu_tree, hf_dec_bpdu_max_age, tvb,
|
|
BPDU_MAX_AGE, 1, FALSE);
|
|
proto_tree_add_item(bpdu_tree, hf_dec_bpdu_forward_delay, tvb,
|
|
BPDU_FORWARD_DELAY, 1, FALSE);
|
|
|
|
}
|
|
}
|
|
|
|
void
|
|
proto_register_dec_bpdu(void)
|
|
{
|
|
|
|
static hf_register_info hf[] = {
|
|
{ &hf_dec_bpdu_proto_id,
|
|
{ "Protocol Identifier", "dec_stp.protocol",
|
|
FT_UINT8, BASE_HEX, VALS(protocol_id_vals), 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_dec_bpdu_type,
|
|
{ "BPDU Type", "dec_stp.type",
|
|
FT_UINT8, BASE_DEC, VALS(bpdu_type_vals), 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_dec_bpdu_version_id,
|
|
{ "BPDU Version", "dec_stp.version",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_dec_bpdu_flags,
|
|
{ "BPDU flags", "dec_stp.flags",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_dec_bpdu_flags_short_timers,
|
|
{ "Use short timers", "dec_stp.flags.short_timers",
|
|
FT_BOOLEAN, 8, TFS(&tfs_yes_no), BPDU_FLAGS_SHORT_TIMERS,
|
|
NULL, HFILL }},
|
|
{ &hf_dec_bpdu_flags_tcack,
|
|
{ "Topology Change Acknowledgment", "dec_stp.flags.tcack",
|
|
FT_BOOLEAN, 8, TFS(&tfs_yes_no), BPDU_FLAGS_TCACK,
|
|
NULL, HFILL }},
|
|
{ &hf_dec_bpdu_flags_tc,
|
|
{ "Topology Change", "dec_stp.flags.tc",
|
|
FT_BOOLEAN, 8, TFS(&tfs_yes_no), BPDU_FLAGS_TC,
|
|
NULL, HFILL }},
|
|
{ &hf_dec_bpdu_root_pri,
|
|
{ "Root Priority", "dec_stp.root.pri",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_dec_bpdu_root_mac,
|
|
{ "Root MAC", "dec_stp.root.mac",
|
|
FT_ETHER, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_dec_bpdu_root_cost,
|
|
{ "Root Path Cost", "dec_stp.root.cost",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_dec_bpdu_bridge_pri,
|
|
{ "Bridge Priority", "dec_stp.bridge.pri",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_dec_bpdu_bridge_mac,
|
|
{ "Bridge MAC", "dec_stp.bridge.mac",
|
|
FT_ETHER, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_dec_bpdu_port_id,
|
|
{ "Port identifier", "dec_stp.port",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_dec_bpdu_msg_age,
|
|
{ "Message Age", "dec_stp.msg_age",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_dec_bpdu_hello_time,
|
|
{ "Hello Time", "dec_stp.hello",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_dec_bpdu_max_age,
|
|
{ "Max Age", "dec_stp.max_age",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_dec_bpdu_forward_delay,
|
|
{ "Forward Delay", "dec_stp.forward",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_dec_bpdu,
|
|
&ett_dec_bpdu_flags,
|
|
};
|
|
|
|
proto_dec_bpdu = proto_register_protocol("DEC Spanning Tree Protocol",
|
|
"DEC_STP", "dec_stp");
|
|
proto_register_field_array(proto_dec_bpdu, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_dec_bpdu(void)
|
|
{
|
|
dissector_handle_t dec_bpdu_handle;
|
|
|
|
dec_bpdu_handle = create_dissector_handle(dissect_dec_bpdu,
|
|
proto_dec_bpdu);
|
|
dissector_add_uint("ethertype", ETHERTYPE_DEC_LB, dec_bpdu_handle);
|
|
dissector_add_uint("chdlctype", ETHERTYPE_DEC_LB, dec_bpdu_handle);
|
|
dissector_add_uint("ppp.protocol", PPP_DEC_LB, dec_bpdu_handle);
|
|
}
|