![Guy Harris](/assets/img/avatar_default.png)
argument to "tvb_new_subset()" - just use -1 if the subset tvbuff is to run to the end of the parent tvbuff. svn path=/trunk/; revision=5597
541 lines
17 KiB
C
541 lines
17 KiB
C
/* packet-bpdu.c
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* Routines for BPDU (Spanning Tree Protocol) disassembly
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*
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* $Id: packet-bpdu.c,v 1.36 2002/05/30 01:56:54 guy Exp $
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*
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* Copyright 1999 Christophe Tronche <ch.tronche@computer.org>
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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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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#include <stdio.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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#include "llcsaps.h"
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#include "ppptypes.h"
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#include <epan/resolv.h>
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/* Offsets of fields within a BPDU */
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#define BPDU_IDENTIFIER 0
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#define BPDU_VERSION_IDENTIFIER 2
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#define BPDU_TYPE 3
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#define BPDU_FLAGS 4
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#define BPDU_ROOT_IDENTIFIER 5
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#define BPDU_ROOT_PATH_COST 13
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#define BPDU_BRIDGE_IDENTIFIER 17
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#define BPDU_PORT_IDENTIFIER 25
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#define BPDU_MESSAGE_AGE 27
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#define BPDU_MAX_AGE 29
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#define BPDU_HELLO_TIME 31
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#define BPDU_FORWARD_DELAY 33
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#define BPDU_VERSION_1_LENGTH 35
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#define CONF_BPDU_SIZE 35
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#define TC_BPDU_SIZE 4
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#define RST_BPDU_SIZE 36
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/* Flag bits */
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#define BPDU_FLAGS_TCACK 0x80
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#define BPDU_FLAGS_AGREEMENT 0x40
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#define BPDU_FLAGS_FORWARDING 0x20
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#define BPDU_FLAGS_LEARNING 0x10
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#define BPDU_FLAGS_PORT_ROLE_MASK 0x0C
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#define BPDU_FLAGS_PORT_ROLE_SHIFT 2
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#define BPDU_FLAGS_PROPOSAL 0x02
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#define BPDU_FLAGS_TC 0x01
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static int proto_bpdu = -1;
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static int hf_bpdu_proto_id = -1;
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static int hf_bpdu_version_id = -1;
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static int hf_bpdu_type = -1;
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static int hf_bpdu_flags = -1;
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static int hf_bpdu_flags_tcack = -1;
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static int hf_bpdu_flags_agreement = -1;
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static int hf_bpdu_flags_forwarding = -1;
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static int hf_bpdu_flags_learning = -1;
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static int hf_bpdu_flags_port_role = -1;
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static int hf_bpdu_flags_proposal = -1;
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static int hf_bpdu_flags_tc = -1;
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static int hf_bpdu_root_mac = -1;
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static int hf_bpdu_root_cost = -1;
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static int hf_bpdu_bridge_mac = -1;
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static int hf_bpdu_port_id = -1;
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static int hf_bpdu_msg_age = -1;
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static int hf_bpdu_max_age = -1;
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static int hf_bpdu_hello_time = -1;
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static int hf_bpdu_forward_delay = -1;
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static int hf_bpdu_version_1_length = -1;
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static gint ett_bpdu = -1;
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static gint ett_bpdu_flags = -1;
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static dissector_handle_t gvrp_handle;
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static dissector_handle_t gmrp_handle;
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static dissector_handle_t data_handle;
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static const value_string protocol_id_vals[] = {
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{ 0, "Spanning Tree Protocol" },
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{ 0, NULL }
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};
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#define BPDU_TYPE_CONF 0x00
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#define BPDU_TYPE_RST 0x02
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#define BPDU_TYPE_TOPOLOGY_CHANGE 0x80
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static const value_string bpdu_type_vals[] = {
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{ BPDU_TYPE_CONF, "Configuration" },
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{ BPDU_TYPE_RST, "Rapid Spanning Tree" },
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{ BPDU_TYPE_TOPOLOGY_CHANGE, "Topology Change Notification" },
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{ 0, NULL }
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};
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static const value_string role_vals[] = {
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{ 1, "Alternate or Backup" },
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{ 2, "Root" },
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{ 3, "Designated" },
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{ 0, NULL }
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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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#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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static void
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dissect_bpdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint16 protocol_identifier;
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guint8 protocol_version_identifier;
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guint8 bpdu_type;
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guint8 flags;
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guint16 root_identifier_bridge_priority;
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const guint8 *root_identifier_mac;
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gchar *root_identifier_mac_str;
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guint32 root_path_cost;
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guint16 bridge_identifier_bridge_priority;
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const guint8 *bridge_identifier_mac;
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gchar *bridge_identifier_mac_str;
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guint16 port_identifier;
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double message_age;
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double max_age;
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double hello_time;
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double forward_delay;
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proto_tree *bpdu_tree;
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proto_item *bpdu_item;
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proto_tree *flags_tree;
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proto_item *flags_item;
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guint8 rstp_bpdu;
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const char *sep;
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/* GARP application frames require special interpretation of the
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destination address field; otherwise, they will be mistaken as
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BPDU frames.
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Fortunately, they can be recognized by checking the first 6 octets
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of the destination address, which are in the range from
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01-80-C2-00-00-20 to 01-80-C2-00-00-2F.
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Yes - we *do* need to check the destination address type;
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on Linux cooked captures, there *is* no destination address,
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so it's AT_NONE. */
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if (pinfo->dl_dst.type == AT_ETHER &&
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pinfo->dl_dst.data[0] == 0x01 && pinfo->dl_dst.data[1] == 0x80 &&
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pinfo->dl_dst.data[2] == 0xC2 && pinfo->dl_dst.data[3] == 0x00 &&
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pinfo->dl_dst.data[4] == 0x00 && ((pinfo->dl_dst.data[5] & 0x20) == 0x20)) {
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protocol_identifier = tvb_get_ntohs(tvb, BPDU_IDENTIFIER);
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switch (pinfo->dl_dst.data[5]) {
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case 0x20:
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/* for GMRP */
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call_dissector(gmrp_handle, tvb, pinfo, tree);
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return;
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case 0x21:
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/* for GVRP */
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call_dissector(gvrp_handle, tvb, pinfo, tree);
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return;
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}
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pinfo->current_proto = "GARP";
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if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "GARP");
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/* Generic Attribute Registration Protocol */
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}
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO,
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"Unknown GARP application (0x%02X)",
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pinfo->dl_dst.data[5]);
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}
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return;
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}
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if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "STP"); /* Spanning Tree Protocol */
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}
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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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}
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bpdu_type = tvb_get_guint8(tvb, BPDU_TYPE);
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switch (bpdu_type) {
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case BPDU_TYPE_CONF:
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case BPDU_TYPE_RST:
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flags = tvb_get_guint8(tvb, BPDU_FLAGS);
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root_identifier_bridge_priority = tvb_get_ntohs(tvb,
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BPDU_ROOT_IDENTIFIER);
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root_identifier_mac = tvb_get_ptr(tvb, BPDU_ROOT_IDENTIFIER + 2, 6);
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root_identifier_mac_str = ether_to_str(root_identifier_mac);
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root_path_cost = tvb_get_ntohl(tvb, BPDU_ROOT_PATH_COST);
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port_identifier = tvb_get_ntohs(tvb, BPDU_PORT_IDENTIFIER);
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break;
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default:
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/* Squelch GCC complaints. */
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flags = 0;
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root_identifier_bridge_priority = 0;
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root_identifier_mac = NULL;
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root_identifier_mac_str = NULL;
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root_path_cost = 0;
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port_identifier = 0;
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break;
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}
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if (check_col(pinfo->cinfo, COL_INFO)) {
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switch (bpdu_type) {
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case BPDU_TYPE_CONF:
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col_add_fstr(pinfo->cinfo, COL_INFO, "Conf. %sRoot = %d/%s Cost = %d Port = 0x%04x",
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flags & 0x1 ? "TC + " : "",
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root_identifier_bridge_priority, root_identifier_mac_str, root_path_cost,
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port_identifier);
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break;
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case BPDU_TYPE_TOPOLOGY_CHANGE:
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col_add_fstr(pinfo->cinfo, COL_INFO, "Topology Change Notification");
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break;
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case BPDU_TYPE_RST:
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col_add_fstr(pinfo->cinfo, COL_INFO, "RST. %sRoot = %d/%s Cost = %d Port = 0x%04x",
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flags & 0x1 ? "TC + " : "",
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root_identifier_bridge_priority, root_identifier_mac_str, root_path_cost,
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port_identifier);
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break;
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default:
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col_add_fstr(pinfo->cinfo, COL_INFO, "Unknown BPDU type (%u)",
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bpdu_type);
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break;
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}
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}
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switch (bpdu_type) {
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case BPDU_TYPE_CONF:
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set_actual_length(tvb, CONF_BPDU_SIZE);
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break;
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case BPDU_TYPE_TOPOLOGY_CHANGE:
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set_actual_length(tvb, TC_BPDU_SIZE);
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break;
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case BPDU_TYPE_RST:
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set_actual_length(tvb, RST_BPDU_SIZE);
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break;
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}
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if (tree) {
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bpdu_item = proto_tree_add_protocol_format(tree, proto_bpdu, tvb,
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0, -1, "Spanning Tree Protocol");
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bpdu_tree = proto_item_add_subtree(bpdu_item, ett_bpdu);
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protocol_identifier = tvb_get_ntohs(tvb, BPDU_IDENTIFIER);
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proto_tree_add_uint(bpdu_tree, hf_bpdu_proto_id, tvb,
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BPDU_IDENTIFIER, 2, protocol_identifier);
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protocol_version_identifier = tvb_get_guint8(tvb, BPDU_VERSION_IDENTIFIER);
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proto_tree_add_uint(bpdu_tree, hf_bpdu_version_id, tvb,
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BPDU_VERSION_IDENTIFIER, 1,
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protocol_version_identifier);
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switch (protocol_version_identifier) {
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case 0:
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break;
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case 2:
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break;
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default:
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proto_tree_add_text(bpdu_tree, tvb, BPDU_VERSION_IDENTIFIER, 1,
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" (Warning: this version of Ethereal only knows about versions 0 & 2)");
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break;
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}
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proto_tree_add_uint(bpdu_tree, hf_bpdu_type, tvb,
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BPDU_TYPE, 1,
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bpdu_type);
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if (bpdu_type != BPDU_TYPE_CONF && bpdu_type != BPDU_TYPE_RST) {
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call_dissector(data_handle,
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tvb_new_subset(tvb, BPDU_TYPE + 1, -1, -1),
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pinfo, tree);
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return;
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}
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rstp_bpdu = (bpdu_type == BPDU_TYPE_RST);
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bridge_identifier_bridge_priority = tvb_get_ntohs(tvb, BPDU_BRIDGE_IDENTIFIER);
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bridge_identifier_mac = tvb_get_ptr(tvb, BPDU_BRIDGE_IDENTIFIER + 2, 6);
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bridge_identifier_mac_str = ether_to_str(bridge_identifier_mac);
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flags_item = proto_tree_add_uint(bpdu_tree, hf_bpdu_flags, tvb,
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BPDU_FLAGS, 1, flags);
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flags_tree = proto_item_add_subtree(flags_item, ett_bpdu_flags);
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sep = initial_sep;
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APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_TCACK, flags_item,
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"%sTopology Change Acknowledgment");
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proto_tree_add_boolean(flags_tree, hf_bpdu_flags_tcack, tvb,
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BPDU_FLAGS, 1, flags);
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if (rstp_bpdu) {
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APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_AGREEMENT, flags_item,
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"%sAgreement");
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proto_tree_add_boolean(flags_tree, hf_bpdu_flags_agreement, tvb,
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BPDU_FLAGS, 1, flags);
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APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_FORWARDING, flags_item,
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"%sForwarding");
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proto_tree_add_boolean(flags_tree, hf_bpdu_flags_forwarding, tvb,
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BPDU_FLAGS, 1, flags);
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APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_LEARNING, flags_item,
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"%sLearning");
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proto_tree_add_boolean(flags_tree, hf_bpdu_flags_learning, tvb,
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BPDU_FLAGS, 1, flags);
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if (flags_item) {
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guint8 port_role;
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port_role = (flags & BPDU_FLAGS_PORT_ROLE_MASK) >> BPDU_FLAGS_PORT_ROLE_SHIFT;
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proto_item_append_text(flags_item, "%sPort Role: %s", sep,
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val_to_str(port_role, role_vals,
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"Unknown (%u)"));
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}
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sep = cont_sep;
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proto_tree_add_uint(flags_tree, hf_bpdu_flags_port_role, tvb,
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BPDU_FLAGS, 1, flags);
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APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_PROPOSAL, flags_item,
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"%sProposal");
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proto_tree_add_boolean(flags_tree, hf_bpdu_flags_proposal, tvb,
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BPDU_FLAGS, 1, flags);
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}
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APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_TC, flags_item,
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"%sTopology Change");
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proto_tree_add_boolean(flags_tree, hf_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(flags_item, ")");
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}
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proto_tree_add_ether_hidden(bpdu_tree, hf_bpdu_root_mac, tvb,
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BPDU_ROOT_IDENTIFIER + 2, 6,
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root_identifier_mac);
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proto_tree_add_text(bpdu_tree, tvb,
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BPDU_ROOT_IDENTIFIER, 8,
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"Root Identifier: %d / %s",
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root_identifier_bridge_priority,
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root_identifier_mac_str);
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proto_tree_add_uint(bpdu_tree, hf_bpdu_root_cost, tvb,
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BPDU_ROOT_PATH_COST, 4,
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root_path_cost);
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proto_tree_add_text(bpdu_tree, tvb,
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BPDU_BRIDGE_IDENTIFIER, 8,
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"Bridge Identifier: %d / %s",
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bridge_identifier_bridge_priority,
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bridge_identifier_mac_str);
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proto_tree_add_ether_hidden(bpdu_tree, hf_bpdu_bridge_mac, tvb,
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BPDU_BRIDGE_IDENTIFIER + 2, 6,
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bridge_identifier_mac);
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proto_tree_add_uint(bpdu_tree, hf_bpdu_port_id, tvb,
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BPDU_PORT_IDENTIFIER, 2,
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port_identifier);
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message_age = tvb_get_ntohs(tvb, BPDU_MESSAGE_AGE) / 256.0;
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proto_tree_add_double(bpdu_tree, hf_bpdu_msg_age, tvb,
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BPDU_MESSAGE_AGE, 2,
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message_age);
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max_age = tvb_get_ntohs(tvb, BPDU_MAX_AGE) / 256.0;
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proto_tree_add_double(bpdu_tree, hf_bpdu_max_age, tvb,
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BPDU_MAX_AGE, 2,
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max_age);
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hello_time = tvb_get_ntohs(tvb, BPDU_HELLO_TIME) / 256.0;
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proto_tree_add_double(bpdu_tree, hf_bpdu_hello_time, tvb,
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BPDU_HELLO_TIME, 2,
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hello_time);
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forward_delay = tvb_get_ntohs(tvb, BPDU_FORWARD_DELAY) / 256.0;
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proto_tree_add_double(bpdu_tree, hf_bpdu_forward_delay, tvb,
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BPDU_FORWARD_DELAY, 2,
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forward_delay);
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if (rstp_bpdu) {
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proto_tree_add_item(bpdu_tree, hf_bpdu_version_1_length, tvb,
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BPDU_VERSION_1_LENGTH, 1, FALSE);
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}
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}
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}
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static const true_false_string yesno = {
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"Yes",
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"No"
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};
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void
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proto_register_bpdu(void)
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{
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static hf_register_info hf[] = {
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{ &hf_bpdu_proto_id,
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{ "Protocol Identifier", "stp.protocol",
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FT_UINT16, BASE_HEX, VALS(&protocol_id_vals), 0x0,
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"", HFILL }},
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{ &hf_bpdu_version_id,
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{ "Protocol Version Identifier", "stp.version",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"", HFILL }},
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{ &hf_bpdu_type,
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{ "BPDU Type", "stp.type",
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FT_UINT8, BASE_HEX, VALS(&bpdu_type_vals), 0x0,
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"", HFILL }},
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{ &hf_bpdu_flags,
|
|
{ "BPDU flags", "stp.flags",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
"", HFILL }},
|
|
{ &hf_bpdu_flags_tcack,
|
|
{ "Topology Change Acknowledgment", "stp.flags.tcack",
|
|
FT_BOOLEAN, 8, TFS(&yesno), BPDU_FLAGS_TCACK,
|
|
"", HFILL }},
|
|
{ &hf_bpdu_flags_agreement,
|
|
{ "Agreement", "stp.flags.agreement",
|
|
FT_BOOLEAN, 8, TFS(&yesno), BPDU_FLAGS_AGREEMENT,
|
|
"", HFILL }},
|
|
{ &hf_bpdu_flags_forwarding,
|
|
{ "Forwarding", "stp.flags.forwarding",
|
|
FT_BOOLEAN, 8, TFS(&yesno), BPDU_FLAGS_FORWARDING,
|
|
"", HFILL }},
|
|
{ &hf_bpdu_flags_learning,
|
|
{ "Learning", "stp.flags.learning",
|
|
FT_BOOLEAN, 8, TFS(&yesno), BPDU_FLAGS_LEARNING,
|
|
"", HFILL }},
|
|
{ &hf_bpdu_flags_port_role,
|
|
{ "Port Role", "stp.flags.port_role",
|
|
FT_UINT8, BASE_DEC, VALS(role_vals), BPDU_FLAGS_PORT_ROLE_MASK,
|
|
"", HFILL }},
|
|
{ &hf_bpdu_flags_proposal,
|
|
{ "Proposal", "stp.flags.proposal",
|
|
FT_BOOLEAN, 8, TFS(&yesno), BPDU_FLAGS_PROPOSAL,
|
|
"", HFILL }},
|
|
{ &hf_bpdu_flags_tc,
|
|
{ "Topology Change", "stp.flags.tc",
|
|
FT_BOOLEAN, 8, TFS(&yesno), BPDU_FLAGS_TC,
|
|
"", HFILL }},
|
|
{ &hf_bpdu_root_mac,
|
|
{ "Root Identifier", "stp.root.hw",
|
|
FT_ETHER, BASE_NONE, NULL, 0x0,
|
|
"", HFILL }},
|
|
{ &hf_bpdu_root_cost,
|
|
{ "Root Path Cost", "stp.root.cost",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"", HFILL }},
|
|
{ &hf_bpdu_bridge_mac,
|
|
{ "Bridge Identifier", "stp.bridge.hw",
|
|
FT_ETHER, BASE_NONE, NULL, 0x0,
|
|
"", HFILL }},
|
|
{ &hf_bpdu_port_id,
|
|
{ "Port identifier", "stp.port",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
"", HFILL }},
|
|
{ &hf_bpdu_msg_age,
|
|
{ "Message Age", "stp.msg_age",
|
|
FT_DOUBLE, BASE_NONE, NULL, 0x0,
|
|
"", HFILL }},
|
|
{ &hf_bpdu_max_age,
|
|
{ "Max Age", "stp.max_age",
|
|
FT_DOUBLE, BASE_NONE, NULL, 0x0,
|
|
"", HFILL }},
|
|
{ &hf_bpdu_hello_time,
|
|
{ "Hello Time", "stp.hello",
|
|
FT_DOUBLE, BASE_NONE, NULL, 0x0,
|
|
"", HFILL }},
|
|
{ &hf_bpdu_forward_delay,
|
|
{ "Forward Delay", "stp.forward",
|
|
FT_DOUBLE, BASE_NONE, NULL, 0x0,
|
|
"", HFILL }},
|
|
{ &hf_bpdu_version_1_length,
|
|
{ "Version 1 Length", "stp.version_1_length",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"", HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_bpdu,
|
|
&ett_bpdu_flags,
|
|
};
|
|
|
|
proto_bpdu = proto_register_protocol("Spanning Tree Protocol", "STP", "stp");
|
|
proto_register_field_array(proto_bpdu, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
register_dissector("bpdu", dissect_bpdu, proto_bpdu);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_bpdu(void)
|
|
{
|
|
dissector_handle_t bpdu_handle;
|
|
|
|
/*
|
|
* Get handle for the GVRP dissector.
|
|
*/
|
|
gvrp_handle = find_dissector("gvrp");
|
|
|
|
/*
|
|
* Get handle for the GMRP dissector.
|
|
*/
|
|
gmrp_handle = find_dissector("gmrp");
|
|
data_handle = find_dissector("data");
|
|
|
|
bpdu_handle = find_dissector("bpdu");
|
|
dissector_add("llc.dsap", SAP_BPDU, bpdu_handle);
|
|
dissector_add("ppp.protocol", PPP_BPDU, bpdu_handle);
|
|
}
|