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wireshark/epan/dissectors/packet-bpdu.c

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/* packet-bpdu.c
* Routines for BPDU (Spanning Tree Protocol) disassembly
*
* $Id$
*
* Copyright 1999 Christophe Tronche <ch.tronche@computer.org>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <glib.h>
#include <epan/packet.h>
#include <epan/llcsaps.h>
#include <epan/ppptypes.h>
#include <epan/chdlctypes.h>
#include <epan/etypes.h>
#include <epan/addr_resolv.h>
#include <epan/prefs.h>
/* Offsets of fields within a BPDU */
#define BPDU_IDENTIFIER 0
#define BPDU_VERSION_IDENTIFIER 2
#define BPDU_TYPE 3
#define BPDU_FLAGS 4
#define BPDU_ROOT_IDENTIFIER 5
#define BPDU_ROOT_PATH_COST 13
#define BPDU_BRIDGE_IDENTIFIER 17
#define BPDU_PORT_IDENTIFIER 25
#define BPDU_MESSAGE_AGE 27
#define BPDU_MAX_AGE 29
#define BPDU_HELLO_TIME 31
#define BPDU_FORWARD_DELAY 33
#define BPDU_VERSION_1_LENGTH 35
#define BPDU_VERSION_3_LENGTH 36
#define BPDU_MST_CONFIG_FORMAT_SELECTOR 38
#define BPDU_MST_CONFIG_NAME 39
#define BPDU_MST_CONFIG_REVISION_LEVEL 71
#define BPDU_MST_CONFIG_DIGEST 73
#define BPDU_CIST_INTERNAL_ROOT_PATH_COST 89
#define BPDU_CIST_BRIDGE_IDENTIFIER 93
#define BPDU_CIST_REMAINING_HOPS 101
#define BPDU_MSTI 102
#define MSTI_FLAGS 0
#define MSTI_REGIONAL_ROOT 1
#define MSTI_INTERNAL_ROOT_PATH_COST 9
#define MSTI_BRIDGE_IDENTIFIER_PRIORITY 13
#define MSTI_PORT_IDENTIFIER_PRIORITY 14
#define MSTI_REMAINING_HOPS 15
#define CONF_BPDU_SIZE 35
#define TC_BPDU_SIZE 4
#define MST_BPDU_SIZE 38
#define VERSION_3_STATIC_LENGTH 64
#define MSTI_MESSAGE_SIZE 16
/* Values for the Alternative MSTI format */
#define ALT_BPDU_CIST_BRIDGE_IDENTIFIER 89
#define ALT_BPDU_CIST_INTERNAL_ROOT_PATH_COST 97
#define ALT_MSTI_MSTID 0
#define ALT_MSTI_FLAGS 2
#define ALT_MSTI_REGIONAL_ROOT 3
#define ALT_MSTI_INTERNAL_ROOT_PATH_COST 11
#define ALT_MSTI_BRIDGE_IDENTIFIER 15
#define ALT_MSTI_PORT_IDENTIFIER 23
#define ALT_MSTI_REMAINING_HOPS 25
#define ALT_MSTI_MESSAGE_SIZE 26
/* Flag bits */
#define BPDU_FLAGS_TCACK 0x80
#define BPDU_FLAGS_AGREEMENT 0x40
#define BPDU_FLAGS_FORWARDING 0x20
#define BPDU_FLAGS_LEARNING 0x10
#define BPDU_FLAGS_PORT_ROLE_MASK 0x0C
#define BPDU_FLAGS_PORT_ROLE_SHIFT 2
#define BPDU_FLAGS_PROPOSAL 0x02
#define BPDU_FLAGS_TC 0x01
static int proto_bpdu = -1;
static int hf_bpdu_proto_id = -1;
static int hf_bpdu_version_id = -1;
static int hf_bpdu_type = -1;
static int hf_bpdu_flags = -1;
static int hf_bpdu_flags_tcack = -1;
static int hf_bpdu_flags_agreement = -1;
static int hf_bpdu_flags_forwarding = -1;
static int hf_bpdu_flags_learning = -1;
static int hf_bpdu_flags_port_role = -1;
static int hf_bpdu_flags_proposal = -1;
static int hf_bpdu_flags_tc = -1;
static int hf_bpdu_root_prio = -1;
static int hf_bpdu_root_sys_id_ext = -1;
static int hf_bpdu_root_mac = -1;
static int hf_bpdu_root_cost = -1;
static int hf_bpdu_bridge_prio = -1;
static int hf_bpdu_bridge_sys_id_ext = -1;
static int hf_bpdu_bridge_mac = -1;
static int hf_bpdu_port_id = -1;
static int hf_bpdu_msg_age = -1;
static int hf_bpdu_max_age = -1;
static int hf_bpdu_hello_time = -1;
static int hf_bpdu_forward_delay = -1;
static int hf_bpdu_version_1_length = -1;
static int hf_bpdu_version_3_length = -1;
static int hf_bpdu_mst_config_format_selector = -1;
static int hf_bpdu_mst_config_name = -1;
static int hf_bpdu_mst_config_revision_level = -1;
static int hf_bpdu_mst_config_digest = -1;
static int hf_bpdu_cist_internal_root_path_cost = -1;
static int hf_bpdu_cist_bridge_prio = -1;
static int hf_bpdu_cist_bridge_sys_id_ext = -1;
static int hf_bpdu_cist_bridge_mac = -1;
static int hf_bpdu_cist_remaining_hops = -1;
static int hf_bpdu_msti_flags = -1;
static int hf_bpdu_msti_regional_root_mac = -1;
static int hf_bpdu_msti_internal_root_path_cost = -1;
static int hf_bpdu_msti_bridge_identifier_priority = -1;
static int hf_bpdu_msti_port_identifier_priority = -1;
static int hf_bpdu_msti_port_id = -1;
static int hf_bpdu_msti_remaining_hops = -1;
static int hf_bpdu_version_4_length = -1;
static int hf_bpdu_spt_config_format_selector = -1;
static int hf_bpdu_spt_config_name = -1;
static int hf_bpdu_spt_config_revision_level = -1;
static int hf_bpdu_spt_config_digest = -1;
static int hf_bpdu_flags_agree_num = -1;
static int hf_bpdu_flags_dagree_num = -1;
static int hf_bpdu_flags_agree_valid = -1;
static int hf_bpdu_flags_restricted_role = -1;
static int hf_bpdu_spt_agreement_digest = -1;
static gint ett_bpdu = -1;
static gint ett_bpdu_flags = -1;
static gint ett_root_id = -1;
static gint ett_bridge_id = -1;
static gint ett_mstp = -1;
static gint ett_msti = -1;
static gint ett_cist_bridge_id = -1;
static gint ett_spt = -1;
static gint ett_aux_mcid = -1;
static gint ett_agreement = -1;
static gboolean bpdu_use_system_id_extensions = TRUE;
static dissector_handle_t gvrp_handle;
static dissector_handle_t gmrp_handle;
static dissector_handle_t data_handle;
static const value_string protocol_id_vals[] = {
{ 0, "Spanning Tree Protocol" },
{ 0, NULL }
};
#define BPDU_TYPE_CONF 0x00 /* STP Configuration BPDU */
#define BPDU_TYPE_RST 0x02 /* RST BPDU (or MST) */
#define BPDU_TYPE_TOPOLOGY_CHANGE 0x80 /* STP TCN (Topology change notify) BPDU */
static const value_string bpdu_type_vals[] = {
{ BPDU_TYPE_CONF, "Configuration" },
{ BPDU_TYPE_RST, "Rapid/Multiple Spanning Tree" },
{ BPDU_TYPE_TOPOLOGY_CHANGE, "Topology Change Notification" },
{ 0, NULL }
};
#define PROTO_VERSION_STP 0
#define PROTO_VERSION_RSTP 2
#define PROTO_VERSION_MSTP 3
#define PROTO_VERSION_SPB 4
#define MSTI_FORMAT_UNKNOWN 0
#define MSTI_FORMAT_IEEE_8021S 1
#define MSTI_FORMAT_ALTERNATIVE 2
static const value_string version_id_vals[] = {
{ PROTO_VERSION_STP, "Spanning Tree" },
{ PROTO_VERSION_RSTP, "Rapid Spanning Tree" },
{ PROTO_VERSION_MSTP, "Multiple Spanning Tree" },
{ PROTO_VERSION_SPB, "Shortest Path Tree" },
{ 0, NULL}
};
static const value_string role_vals[] = {
{ 1, "Alternate or Backup" },
{ 2, "Root" },
{ 3, "Designated" },
{ 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_bpdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint16 protocol_identifier;
guint8 protocol_version_identifier;
guint8 bpdu_type;
guint8 flags;
guint16 root_identifier_bridge_priority;
guint16 root_identifier_system_id_extension = 0;
const gchar *root_identifier_mac_str;
guint32 root_path_cost;
guint16 bridge_identifier_bridge_priority;
guint16 bridge_identifier_system_id_extension = 0;
const gchar *bridge_identifier_mac_str;
guint16 port_identifier;
double message_age;
double max_age;
double hello_time;
double forward_delay;
guint8 version_1_length;
guint16 version_3_length;
guint16 version_4_length = 0;
guint16 bpdu_version_4_length = 0;
guint8 config_format_selector;
guint16 cist_bridge_identifier_bridge_priority;
guint16 cist_bridge_identifier_system_id_extension = 0;
const gchar *cist_bridge_identifier_mac_str;
guint16 msti_mstid;
guint32 msti_regional_root_mstid, msti_regional_root_priority;
const gchar *msti_regional_root_mac_str;
guint16 msti_bridge_identifier_priority, msti_port_identifier_priority;
const gchar *msti_bridge_identifier_mac_str;
int total_msti_length, offset, msti, msti_format;
int msti_length_remaining;
guint8 agree_num = 0, dagree_num = 0;
int spt_offset = 0;
guint16 spt_edge_count = 0;
int MCID_LEN = 51;
guint8 spt_agree_data = 0;
proto_tree *bpdu_tree;
proto_tree *mstp_tree, *msti_tree, *spt_tree = NULL, *aux_mcid_tree = NULL, *agreement_tree = NULL;
proto_item *bpdu_item;
proto_item *mstp_item, *msti_item, *spt_item = NULL, *aux_mcid_item = NULL, *agreement_item = NULL;
proto_tree *flags_tree;
proto_item *flags_item;
proto_tree *root_id_tree;
proto_item *root_id_item;
proto_tree *bridge_id_tree;
proto_item *bridge_id_item;
proto_tree *cist_bridge_id_tree;
proto_item *cist_bridge_id_item;
proto_item *hidden_item;
const char *sep;
/* GARP application frames require special interpretation of the
destination address field; otherwise, they will be mistaken as
BPDU frames.
Fortunately, they can be recognized by checking the first 6 octets
of the destination address, which are in the range from
01-80-C2-00-00-20 to 01-80-C2-00-00-2F.
Yes - we *do* need to check the destination address type;
on Linux cooked captures, there *is* no destination address,
so it's AT_NONE. */
if (pinfo->dl_dst.type == AT_ETHER) {
const guint8 *dstaddr;
dstaddr = pinfo->dl_dst.data;
if(dstaddr[0] == 0x01 && dstaddr[1] == 0x80 &&
dstaddr[2] == 0xC2 && dstaddr[3] == 0x00 &&
dstaddr[4] == 0x00 && ((dstaddr[5] == 0x0D) || ((dstaddr[5] & 0xF0) == 0x20))) {
switch (dstaddr[5]) {
case 0x20:
/* for GMRP */
call_dissector(gmrp_handle, tvb, pinfo, tree);
return;
case 0x21:
case 0x0D:
/* for GVRP */
call_dissector(gvrp_handle, tvb, pinfo, tree);
return;
}
pinfo->current_proto = "GARP";
col_set_str(pinfo->cinfo, COL_PROTOCOL, "GARP");
/* Generic Attribute Registration Protocol */
col_add_fstr(pinfo->cinfo, COL_INFO,
"Unknown GARP application (0x%02X)",
dstaddr[5]);
return;
}
}
col_set_str(pinfo->cinfo, COL_PROTOCOL, "STP"); /* Spanning Tree Protocol */
col_clear(pinfo->cinfo, COL_INFO);
bpdu_type = tvb_get_guint8(tvb, BPDU_TYPE);
protocol_version_identifier = tvb_get_guint8(tvb, BPDU_VERSION_IDENTIFIER);
switch (bpdu_type) {
case BPDU_TYPE_CONF:
case BPDU_TYPE_RST:
flags = tvb_get_guint8(tvb, BPDU_FLAGS);
root_identifier_bridge_priority = tvb_get_ntohs(tvb,BPDU_ROOT_IDENTIFIER);
if (bpdu_use_system_id_extensions ) {
root_identifier_system_id_extension = root_identifier_bridge_priority & 0x0fff;
root_identifier_bridge_priority &= 0xf000;
}
root_identifier_mac_str = tvb_ether_to_str(tvb, BPDU_ROOT_IDENTIFIER + 2);
root_path_cost = tvb_get_ntohl(tvb, BPDU_ROOT_PATH_COST);
port_identifier = tvb_get_ntohs(tvb, BPDU_PORT_IDENTIFIER);
break;
default:
/* Squelch GCC complaints. */
flags = 0;
root_identifier_bridge_priority = 0;
root_identifier_mac_str = NULL;
root_path_cost = 0;
port_identifier = 0;
break;
}
switch (bpdu_type) {
case BPDU_TYPE_CONF:
if (bpdu_use_system_id_extensions ) {
col_add_fstr(pinfo->cinfo, COL_INFO,
"Conf. %sRoot = %d/%d/%s Cost = %d Port = 0x%04x",
flags & 0x1 ? "TC + " : "",
root_identifier_bridge_priority,
root_identifier_system_id_extension,
root_identifier_mac_str,
root_path_cost, port_identifier);
} else {
col_add_fstr(pinfo->cinfo, COL_INFO,
"Conf. %sRoot = %d/%s Cost = %d Port = 0x%04x",
flags & 0x1 ? "TC + " : "",
root_identifier_bridge_priority, root_identifier_mac_str,
root_path_cost, port_identifier);
}
break;
case BPDU_TYPE_TOPOLOGY_CHANGE:
col_set_str(pinfo->cinfo, COL_INFO, "Topology Change Notification");
break;
case BPDU_TYPE_RST:
if (bpdu_use_system_id_extensions ) {
col_add_fstr(pinfo->cinfo, COL_INFO,
"%sT. %sRoot = %d/%d/%s Cost = %d Port = 0x%04x",
protocol_version_identifier == 3 ? "MS":
(protocol_version_identifier == 4 ? "SP":"RS"),
flags & 0x1 ? "TC + " : "",
root_identifier_bridge_priority,
root_identifier_system_id_extension,
root_identifier_mac_str,
root_path_cost, port_identifier);
} else {
col_add_fstr(pinfo->cinfo, COL_INFO,
"%sT. %sRoot = %d/%s Cost = %d Port = 0x%04x",
protocol_version_identifier == 3 ? "MS":
(protocol_version_identifier == 4 ? "SP":"RS"),
flags & 0x1 ? "TC + " : "",
root_identifier_bridge_priority, root_identifier_mac_str,
root_path_cost, port_identifier);
}
break;
default:
col_add_fstr(pinfo->cinfo, COL_INFO, "Unknown BPDU type (%u)", bpdu_type);
break;
}
if (tree) {
bpdu_item = proto_tree_add_protocol_format(tree, proto_bpdu, tvb, 0, -1,
"Spanning Tree Protocol");
bpdu_tree = proto_item_add_subtree(bpdu_item, ett_bpdu);
protocol_identifier = tvb_get_ntohs(tvb, BPDU_IDENTIFIER);
proto_tree_add_uint(bpdu_tree, hf_bpdu_proto_id, tvb, BPDU_IDENTIFIER, 2,
protocol_identifier);
proto_tree_add_uint(bpdu_tree, hf_bpdu_version_id, tvb,
BPDU_VERSION_IDENTIFIER, 1,
protocol_version_identifier);
switch (protocol_version_identifier) {
case 0:
break;
case 2:
case 3:
case 4:
break;
default:
proto_tree_add_text(bpdu_tree, tvb, BPDU_VERSION_IDENTIFIER, 1,
" (Warning: this version of Wireshark only knows about versions 0, 2, 3 & 4)");
break;
}
proto_tree_add_uint(bpdu_tree, hf_bpdu_type, tvb, BPDU_TYPE, 1, bpdu_type);
if (bpdu_type == BPDU_TYPE_TOPOLOGY_CHANGE) {
set_actual_length(tvb, TC_BPDU_SIZE);
return;
}
if (bpdu_type != BPDU_TYPE_CONF && bpdu_type != BPDU_TYPE_RST) {
/* Unknown BPDU type - just display the rest of the PDU as data */
proto_tree_add_text(bpdu_tree, tvb, BPDU_TYPE + 1, -1,
"Unknown BPDU type data");
return;
}
bridge_identifier_bridge_priority = tvb_get_ntohs(tvb, BPDU_BRIDGE_IDENTIFIER);
if (bpdu_use_system_id_extensions ) {
bridge_identifier_system_id_extension = bridge_identifier_bridge_priority & 0x0fff;
bridge_identifier_bridge_priority &= 0xf000;
}
bridge_identifier_mac_str = tvb_ether_to_str(tvb, BPDU_BRIDGE_IDENTIFIER + 2);
flags_item = proto_tree_add_uint(bpdu_tree, hf_bpdu_flags, tvb,
BPDU_FLAGS, 1, flags);
flags_tree = proto_item_add_subtree(flags_item, ett_bpdu_flags);
sep = initial_sep;
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_TCACK, flags_item,
"%sTopology Change Acknowledgment");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_tcack, tvb,
BPDU_FLAGS, 1, flags);
if (bpdu_type == BPDU_TYPE_RST) {
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_AGREEMENT, flags_item,
"%sAgreement");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_agreement, tvb,
BPDU_FLAGS, 1, flags);
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_FORWARDING, flags_item,
"%sForwarding");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_forwarding, tvb,
BPDU_FLAGS, 1, flags);
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_LEARNING, flags_item,
"%sLearning");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_learning, tvb,
BPDU_FLAGS, 1, flags);
if (flags_item) {
guint8 port_role;
port_role = (flags & BPDU_FLAGS_PORT_ROLE_MASK) >> BPDU_FLAGS_PORT_ROLE_SHIFT;
proto_item_append_text(flags_item, "%sPort Role: %s", sep,
val_to_str(port_role, role_vals,
"Unknown (%u)"));
}
sep = cont_sep;
proto_tree_add_uint(flags_tree, hf_bpdu_flags_port_role, tvb,
BPDU_FLAGS, 1, flags);
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_PROPOSAL, flags_item,
"%sProposal");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_proposal, tvb,
BPDU_FLAGS, 1, flags);
}
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_TC, flags_item,
"%sTopology Change");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_tc, tvb,
BPDU_FLAGS, 1, flags);
if (sep != initial_sep) {
/* We put something in; put in the terminating ")" */
proto_item_append_text(flags_item, ")");
}
/* add Identifier with format based on preference value
* bpdu_use_system_id_extensions
* */
if (bpdu_use_system_id_extensions) {
root_id_item = proto_tree_add_text(bpdu_tree, tvb,
BPDU_ROOT_IDENTIFIER, 8,
"Root Identifier: %d / %d / %s",
root_identifier_bridge_priority,
root_identifier_system_id_extension,
root_identifier_mac_str);
root_id_tree = proto_item_add_subtree(root_id_item, ett_root_id);
proto_tree_add_uint(root_id_tree, hf_bpdu_root_prio, tvb,
BPDU_ROOT_IDENTIFIER , 1,
root_identifier_bridge_priority);
proto_tree_add_uint(root_id_tree, hf_bpdu_root_sys_id_ext, tvb,
BPDU_ROOT_IDENTIFIER , 2,
root_identifier_system_id_extension);
proto_tree_add_item(root_id_tree, hf_bpdu_root_mac, tvb,
BPDU_ROOT_IDENTIFIER + 2, 6, ENC_BIG_ENDIAN);
} else {
root_id_item = proto_tree_add_text(bpdu_tree, tvb,
BPDU_ROOT_IDENTIFIER, 8,
"Root Identifier: %d / %s",
root_identifier_bridge_priority,
root_identifier_mac_str);
root_id_tree = proto_item_add_subtree(root_id_item, ett_root_id);
proto_tree_add_uint(root_id_tree, hf_bpdu_root_prio, tvb,
BPDU_ROOT_IDENTIFIER , 2,
root_identifier_bridge_priority);
proto_tree_add_item(root_id_tree, hf_bpdu_root_mac, tvb,
BPDU_ROOT_IDENTIFIER + 2, 6, ENC_BIG_ENDIAN);
}
/* end of Identifier formatting */
proto_tree_add_uint(bpdu_tree, hf_bpdu_root_cost, tvb,
BPDU_ROOT_PATH_COST, 4, root_path_cost);
/* add Identifier with format based on preference value
* bpdu_use_system_id_extensions
* */
if (bpdu_use_system_id_extensions) {
bridge_id_item = proto_tree_add_text(bpdu_tree, tvb,
BPDU_BRIDGE_IDENTIFIER, 8,
"Bridge Identifier: %d / %d / %s",
bridge_identifier_bridge_priority,
bridge_identifier_system_id_extension,
bridge_identifier_mac_str);
bridge_id_tree = proto_item_add_subtree(bridge_id_item, ett_bridge_id);
proto_tree_add_uint(bridge_id_tree, hf_bpdu_bridge_prio, tvb,
BPDU_BRIDGE_IDENTIFIER , 1,
bridge_identifier_bridge_priority);
proto_tree_add_uint(bridge_id_tree, hf_bpdu_bridge_sys_id_ext, tvb,
BPDU_BRIDGE_IDENTIFIER , 2,
bridge_identifier_system_id_extension);
proto_tree_add_item(bridge_id_tree, hf_bpdu_bridge_mac, tvb,
BPDU_BRIDGE_IDENTIFIER + 2, 6, ENC_BIG_ENDIAN);
} else {
bridge_id_item = proto_tree_add_text(bpdu_tree, tvb,
BPDU_BRIDGE_IDENTIFIER, 8,
"Bridge Identifier: %d / %s",
bridge_identifier_bridge_priority,
bridge_identifier_mac_str);
bridge_id_tree = proto_item_add_subtree(bridge_id_item, ett_bridge_id);
proto_tree_add_uint(bridge_id_tree, hf_bpdu_bridge_prio, tvb,
BPDU_BRIDGE_IDENTIFIER , 2,
bridge_identifier_bridge_priority);
proto_tree_add_item(bridge_id_tree, hf_bpdu_bridge_mac, tvb,
BPDU_BRIDGE_IDENTIFIER + 2, 6, ENC_BIG_ENDIAN);
}
/* end of Identifier formatting */
proto_tree_add_uint(bpdu_tree, hf_bpdu_port_id, tvb,
BPDU_PORT_IDENTIFIER, 2, port_identifier);
message_age = tvb_get_ntohs(tvb, BPDU_MESSAGE_AGE) / 256.0;
proto_tree_add_double(bpdu_tree, hf_bpdu_msg_age, tvb, BPDU_MESSAGE_AGE, 2,
message_age);
max_age = tvb_get_ntohs(tvb, BPDU_MAX_AGE) / 256.0;
proto_tree_add_double(bpdu_tree, hf_bpdu_max_age, tvb, BPDU_MAX_AGE, 2,
max_age);
hello_time = tvb_get_ntohs(tvb, BPDU_HELLO_TIME) / 256.0;
proto_tree_add_double(bpdu_tree, hf_bpdu_hello_time, tvb,
BPDU_HELLO_TIME, 2, hello_time);
forward_delay = tvb_get_ntohs(tvb, BPDU_FORWARD_DELAY) / 256.0;
proto_tree_add_double(bpdu_tree, hf_bpdu_forward_delay, tvb,
BPDU_FORWARD_DELAY, 2, forward_delay);
if (bpdu_type == BPDU_TYPE_CONF) {
/* Nothing more in this BPDU */
set_actual_length(tvb, CONF_BPDU_SIZE);
return;
}
/* RST or MST BPDU */
version_1_length = tvb_get_guint8(tvb, BPDU_VERSION_1_LENGTH);
proto_tree_add_uint(bpdu_tree, hf_bpdu_version_1_length, tvb,
BPDU_VERSION_1_LENGTH, 1, version_1_length);
/* Is this an MST BPDU? */
if (protocol_version_identifier >= 3 && version_1_length == 0 &&
tvb_reported_length(tvb) >= 102) {
/*
* OK, it passes the "Protocol Identifier is 0000 0000
* 0000 0000", "Protocol Version Identifier is 3 or
* greater", "BPDU Type is 0000 0010", "contains 102 or
* more octets", and "a Version 1 Length of 0" tests.
*/
version_3_length = tvb_get_ntohs(tvb, BPDU_VERSION_3_LENGTH);
proto_tree_add_uint(bpdu_tree, hf_bpdu_version_3_length, tvb,
BPDU_VERSION_3_LENGTH, 2, version_3_length);
/*
* Check the Version 3 Length, and see whether it's a
* multiple of the MSTI Configuration Message length. Also
* check the config_format_selector because some MST BPDU's
* have BPDU_VERSION_3_LENGTH set to 0 and use the
* field BPDU_MST_CONFIG_FORMAT_SELECTOR as a length-field
* for the MSTI data.
*/
config_format_selector = tvb_get_guint8(tvb, BPDU_MST_CONFIG_FORMAT_SELECTOR);
if (version_3_length != 0) {
msti_format = MSTI_FORMAT_IEEE_8021S;
if (version_3_length >= VERSION_3_STATIC_LENGTH) {
total_msti_length = version_3_length - VERSION_3_STATIC_LENGTH;
} else {
/*
* XXX - there appears to be an ambiguity in the 802.3Q-2003
* standard and at least some of the 802.3s drafts.
*
* The "Version 3 Length" field is defined to be "the number of
* octets taken by the parameters that follow in the BPDU", but
* it's spoken of as "representing an integral number, from 0 to
* 64 inclusive, of MSTI Configuration Messages".
*
* According to mail from a member of the stds-802-1@ieee.org list,
* the latter of those is just saying that the length must not have
* a value that implies that there's a partial MSTI message in the
* packet; it's still in units of octets, not messages.
*
* However, it appears that Cisco's C3550 software (C3550-I5Q3L2-M,
* Version 12.1(12c)EA1) might be sending out lengths in units of
* messages.
*
* This length can't be the number of octets taken by the parameters
* that follow in the BPDU, because it's less than the fixed-length
* portion of those parameters, so we assume the length is a count of
* messages.
*/
total_msti_length = version_3_length * MSTI_MESSAGE_SIZE;
}
} else {
if (tvb_reported_length(tvb) == (guint)config_format_selector + MST_BPDU_SIZE + 1 ) {
msti_format = MSTI_FORMAT_ALTERNATIVE;
total_msti_length = config_format_selector - VERSION_3_STATIC_LENGTH;
} else {
/*
* XXX - Unknown MSTI format, since version_3_length is 0
* lets assume there are no msti instances in the packet.
*/
msti_format = MSTI_FORMAT_UNKNOWN;
total_msti_length = 0;
}
}
if (protocol_version_identifier == 3) {
set_actual_length(tvb, BPDU_MSTI + total_msti_length);
}
mstp_item = proto_tree_add_text(bpdu_tree, tvb, BPDU_VERSION_3_LENGTH,
-1, "MST Extension");
mstp_tree = proto_item_add_subtree(mstp_item, ett_mstp);
proto_tree_add_item(mstp_tree, hf_bpdu_mst_config_format_selector, tvb,
BPDU_MST_CONFIG_FORMAT_SELECTOR, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(mstp_tree, hf_bpdu_mst_config_name, tvb,
BPDU_MST_CONFIG_NAME, 32, ENC_ASCII|ENC_NA);
proto_tree_add_item(mstp_tree, hf_bpdu_mst_config_revision_level, tvb,
BPDU_MST_CONFIG_REVISION_LEVEL, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(mstp_tree, hf_bpdu_mst_config_digest, tvb,
BPDU_MST_CONFIG_DIGEST, 16, ENC_NA);
switch(msti_format) {
case MSTI_FORMAT_IEEE_8021S:
proto_tree_add_item(mstp_tree, hf_bpdu_cist_internal_root_path_cost, tvb,
BPDU_CIST_INTERNAL_ROOT_PATH_COST, 4, ENC_BIG_ENDIAN);
cist_bridge_identifier_bridge_priority = tvb_get_ntohs(tvb,BPDU_CIST_BRIDGE_IDENTIFIER);
cist_bridge_identifier_mac_str = tvb_ether_to_str(tvb, BPDU_CIST_BRIDGE_IDENTIFIER + 2);
/* add Identifier with format based on preference value
* bpdu_use_system_id_extensions
* */
if (bpdu_use_system_id_extensions ) {
cist_bridge_identifier_system_id_extension = cist_bridge_identifier_bridge_priority & 0x0fff;
cist_bridge_identifier_bridge_priority &= 0xf000;
cist_bridge_id_item = proto_tree_add_text(mstp_tree, tvb,
BPDU_CIST_BRIDGE_IDENTIFIER, 8,
"CIST Bridge Identifier: %d / %d / %s",
cist_bridge_identifier_bridge_priority,
cist_bridge_identifier_system_id_extension,
cist_bridge_identifier_mac_str);
cist_bridge_id_tree = proto_item_add_subtree(cist_bridge_id_item, ett_cist_bridge_id);
proto_tree_add_uint(cist_bridge_id_tree, hf_bpdu_cist_bridge_prio, tvb,
BPDU_CIST_BRIDGE_IDENTIFIER , 1,
cist_bridge_identifier_bridge_priority);
proto_tree_add_uint(cist_bridge_id_tree, hf_bpdu_cist_bridge_sys_id_ext, tvb,
BPDU_CIST_BRIDGE_IDENTIFIER , 2,
cist_bridge_identifier_system_id_extension);
proto_tree_add_item(cist_bridge_id_tree, hf_bpdu_cist_bridge_mac, tvb,
BPDU_CIST_BRIDGE_IDENTIFIER + 2, 6, ENC_BIG_ENDIAN);
} else {
cist_bridge_id_item = proto_tree_add_text(mstp_tree, tvb,
BPDU_CIST_BRIDGE_IDENTIFIER, 8,
"CIST Bridge Identifier: %d / %s",
cist_bridge_identifier_bridge_priority,
cist_bridge_identifier_mac_str);
cist_bridge_id_tree = proto_item_add_subtree(cist_bridge_id_item, ett_cist_bridge_id);
proto_tree_add_uint(cist_bridge_id_tree, hf_bpdu_cist_bridge_prio, tvb,
BPDU_CIST_BRIDGE_IDENTIFIER , 2,
cist_bridge_identifier_bridge_priority);
proto_tree_add_item(cist_bridge_id_tree, hf_bpdu_cist_bridge_mac, tvb,
BPDU_CIST_BRIDGE_IDENTIFIER + 2, 6, ENC_BIG_ENDIAN);
}
/* end of Identifier formatting */
break;
case MSTI_FORMAT_ALTERNATIVE:
cist_bridge_identifier_bridge_priority = tvb_get_ntohs(tvb,ALT_BPDU_CIST_BRIDGE_IDENTIFIER);
cist_bridge_identifier_mac_str = tvb_ether_to_str(tvb, ALT_BPDU_CIST_BRIDGE_IDENTIFIER + 2);
/* add Identifier with format based on preference value
* bpdu_use_system_id_extensions
* */
if (bpdu_use_system_id_extensions ) {
cist_bridge_identifier_system_id_extension = cist_bridge_identifier_bridge_priority & 0x0fff;
cist_bridge_identifier_bridge_priority &= 0xf000;
cist_bridge_id_item = proto_tree_add_text(mstp_tree, tvb,
ALT_BPDU_CIST_BRIDGE_IDENTIFIER, 8,
"CIST Bridge Identifier: %d / %d / %s",
cist_bridge_identifier_bridge_priority,
cist_bridge_identifier_system_id_extension,
cist_bridge_identifier_mac_str);
cist_bridge_id_tree = proto_item_add_subtree(cist_bridge_id_item, ett_cist_bridge_id);
proto_tree_add_uint(cist_bridge_id_tree, hf_bpdu_cist_bridge_prio, tvb,
ALT_BPDU_CIST_BRIDGE_IDENTIFIER , 1,
cist_bridge_identifier_bridge_priority);
proto_tree_add_uint(cist_bridge_id_tree, hf_bpdu_cist_bridge_sys_id_ext, tvb,
ALT_BPDU_CIST_BRIDGE_IDENTIFIER , 2,
cist_bridge_identifier_system_id_extension);
proto_tree_add_item(cist_bridge_id_tree, hf_bpdu_cist_bridge_mac, tvb,
ALT_BPDU_CIST_BRIDGE_IDENTIFIER + 2, 6, ENC_BIG_ENDIAN);
} else {
cist_bridge_id_item = proto_tree_add_text(mstp_tree, tvb,
ALT_BPDU_CIST_BRIDGE_IDENTIFIER, 8,
"CIST Bridge Identifier: %d / %s",
cist_bridge_identifier_bridge_priority,
cist_bridge_identifier_mac_str);
cist_bridge_id_tree = proto_item_add_subtree(cist_bridge_id_item, ett_cist_bridge_id);
proto_tree_add_uint(cist_bridge_id_tree, hf_bpdu_cist_bridge_prio, tvb,
ALT_BPDU_CIST_BRIDGE_IDENTIFIER , 2,
cist_bridge_identifier_bridge_priority);
proto_tree_add_item(cist_bridge_id_tree, hf_bpdu_cist_bridge_mac, tvb,
ALT_BPDU_CIST_BRIDGE_IDENTIFIER + 2, 6, ENC_BIG_ENDIAN);
}
/* end of Identifier formatting */
proto_tree_add_item(mstp_tree, hf_bpdu_cist_internal_root_path_cost, tvb,
ALT_BPDU_CIST_INTERNAL_ROOT_PATH_COST, 4, ENC_BIG_ENDIAN);
break;
}
proto_tree_add_item(mstp_tree, hf_bpdu_cist_remaining_hops, tvb,
BPDU_CIST_REMAINING_HOPS, 1, ENC_BIG_ENDIAN);
/* MSTI messages */
offset = BPDU_MSTI;
msti = 1;
msti_length_remaining = total_msti_length;
while (msti_length_remaining > 0) {
switch(msti_format) {
case MSTI_FORMAT_IEEE_8021S:
msti_regional_root_mstid = tvb_get_guint8(tvb, offset+ MSTI_REGIONAL_ROOT);
msti_regional_root_priority = (msti_regional_root_mstid &0xf0) << 8;
msti_regional_root_mstid = ((msti_regional_root_mstid & 0x0f) << 8) +
tvb_get_guint8(tvb, offset+ MSTI_REGIONAL_ROOT+1);
msti_regional_root_mac_str = tvb_ether_to_str(tvb, MSTI_REGIONAL_ROOT + 2);
msti_item = proto_tree_add_text(mstp_tree, tvb, offset, 16,
"MSTID %d, Regional Root Identifier %d / %s",
msti_regional_root_mstid,
msti_regional_root_priority,
msti_regional_root_mac_str);
msti_tree = proto_item_add_subtree(msti_item, ett_msti);
/* flags */
flags = tvb_get_guint8(tvb, offset+MSTI_FLAGS);
flags_item = proto_tree_add_uint(msti_tree, hf_bpdu_msti_flags, tvb,
offset+MSTI_FLAGS, 1, flags);
flags_tree = proto_item_add_subtree(flags_item, ett_bpdu_flags);
sep = initial_sep;
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_TCACK, flags_item, "%sMaster");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_tcack, tvb,
offset+MSTI_FLAGS, 1, flags);
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_AGREEMENT, flags_item, "%sAgreement");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_agreement, tvb,
offset+MSTI_FLAGS, 1, flags);
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_FORWARDING, flags_item, "%sForwarding");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_forwarding, tvb,
offset+MSTI_FLAGS, 1, flags);
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_LEARNING, flags_item, "%sLearning");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_learning, tvb,
offset+MSTI_FLAGS, 1, flags);
if (flags_item) {
guint8 port_role;
port_role = (flags & BPDU_FLAGS_PORT_ROLE_MASK) >> BPDU_FLAGS_PORT_ROLE_SHIFT;
proto_item_append_text(flags_item, "%sPort Role: %s", sep,
val_to_str(port_role, role_vals,
"Unknown (%u)"));
}
proto_tree_add_uint(flags_tree, hf_bpdu_flags_port_role, tvb,
offset+MSTI_FLAGS, 1, flags);
sep = cont_sep;
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_PROPOSAL, flags_item, "%sProposal");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_proposal, tvb,
offset+MSTI_FLAGS, 1, flags);
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_TC, flags_item, "%sTopology Change");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_tc, tvb,
offset+MSTI_FLAGS, 1, flags);
if (sep != initial_sep) { /* We put something in; put in the terminating ")" */
proto_item_append_text(flags_item, ")");
}
/* pri, MSTID, Regional root */
hidden_item = proto_tree_add_item(msti_tree, hf_bpdu_msti_regional_root_mac, tvb,
offset + MSTI_REGIONAL_ROOT + 2, 6, ENC_BIG_ENDIAN);
PROTO_ITEM_SET_HIDDEN(hidden_item);
proto_tree_add_text(msti_tree, tvb, offset + MSTI_REGIONAL_ROOT, 8,
"MSTID %d, priority %d Root Identifier %s",
msti_regional_root_mstid,
msti_regional_root_priority,
msti_regional_root_mac_str);
proto_tree_add_item(msti_tree, hf_bpdu_msti_internal_root_path_cost, tvb,
offset+MSTI_INTERNAL_ROOT_PATH_COST, 4, ENC_BIG_ENDIAN);
msti_bridge_identifier_priority = tvb_get_guint8(tvb, offset+MSTI_BRIDGE_IDENTIFIER_PRIORITY) >> 4;
msti_port_identifier_priority = tvb_get_guint8(tvb, offset+MSTI_PORT_IDENTIFIER_PRIORITY) >> 4;
proto_tree_add_uint(msti_tree, hf_bpdu_msti_bridge_identifier_priority, tvb,
offset+MSTI_BRIDGE_IDENTIFIER_PRIORITY, 1,
msti_bridge_identifier_priority);
proto_tree_add_uint(msti_tree, hf_bpdu_msti_port_identifier_priority, tvb,
offset+MSTI_PORT_IDENTIFIER_PRIORITY, 1,
msti_port_identifier_priority);
proto_tree_add_item(msti_tree, hf_bpdu_msti_remaining_hops, tvb,
offset + MSTI_REMAINING_HOPS, 1, ENC_BIG_ENDIAN);
msti_length_remaining -= MSTI_MESSAGE_SIZE;
offset += MSTI_MESSAGE_SIZE;
break;
case MSTI_FORMAT_ALTERNATIVE:
msti_regional_root_mstid = tvb_get_guint8(tvb, offset+ ALT_MSTI_REGIONAL_ROOT);
msti_regional_root_priority = (msti_regional_root_mstid &0xf0) << 8;
msti_regional_root_mstid = ((msti_regional_root_mstid & 0x0f) << 8) +
tvb_get_guint8(tvb, offset+ ALT_MSTI_REGIONAL_ROOT+1);
msti_regional_root_mac_str = tvb_ether_to_str(tvb, offset+ ALT_MSTI_REGIONAL_ROOT + 2);
msti_item = proto_tree_add_text(mstp_tree, tvb, offset, 16,
"MSTID %d, Regional Root Identifier %d / %s",
msti_regional_root_mstid,
msti_regional_root_priority,
msti_regional_root_mac_str);
msti_tree = proto_item_add_subtree(msti_item, ett_msti);
msti_mstid = tvb_get_ntohs(tvb, offset+ ALT_MSTI_MSTID);
proto_tree_add_text(msti_tree, tvb, offset+ALT_MSTI_MSTID, 2,
"MSTID: %d", msti_mstid);
/* flags */
flags = tvb_get_guint8(tvb, offset+ALT_MSTI_FLAGS);
flags_item = proto_tree_add_uint(msti_tree, hf_bpdu_msti_flags, tvb,
offset+ALT_MSTI_FLAGS, 1, flags);
flags_tree = proto_item_add_subtree(flags_item, ett_bpdu_flags);
sep = initial_sep;
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_TCACK, flags_item, "%sMaster");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_tcack, tvb,
offset+ALT_MSTI_FLAGS, 1, flags);
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_AGREEMENT, flags_item, "%sAgreement");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_agreement, tvb,
offset+ALT_MSTI_FLAGS, 1, flags);
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_FORWARDING, flags_item, "%sForwarding");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_forwarding, tvb,
offset+ALT_MSTI_FLAGS, 1, flags);
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_LEARNING, flags_item, "%sLearning");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_learning, tvb,
offset+ALT_MSTI_FLAGS, 1, flags);
if (flags_item) {
guint8 port_role;
port_role = (flags & BPDU_FLAGS_PORT_ROLE_MASK) >> BPDU_FLAGS_PORT_ROLE_SHIFT;
proto_item_append_text(flags_item, "%sPort Role: %s", sep,
val_to_str(port_role, role_vals,
"Unknown (%u)"));
}
proto_tree_add_uint(flags_tree, hf_bpdu_flags_port_role, tvb,
offset+ALT_MSTI_FLAGS, 1, flags);
sep = cont_sep;
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_PROPOSAL, flags_item, "%sProposal");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_proposal, tvb,
offset+ALT_MSTI_FLAGS, 1, flags);
APPEND_BOOLEAN_FLAG(flags & BPDU_FLAGS_TC, flags_item, "%sTopology Change");
proto_tree_add_boolean(flags_tree, hf_bpdu_flags_tc, tvb,
offset+ALT_MSTI_FLAGS, 1, flags);
if (sep != initial_sep) { /* We put something in; put in the terminating ")" */
proto_item_append_text(flags_item, ")");
}
/* pri, MSTID, Regional root */
hidden_item = proto_tree_add_item(msti_tree, hf_bpdu_msti_regional_root_mac, tvb,
offset + ALT_MSTI_REGIONAL_ROOT + 2, 6, ENC_BIG_ENDIAN);
PROTO_ITEM_SET_HIDDEN(hidden_item);
proto_tree_add_text(msti_tree, tvb, offset + ALT_MSTI_REGIONAL_ROOT, 8,
"MSTI Regional Root Identifier: %d / %d / %s",
msti_regional_root_mstid,
msti_regional_root_priority,
msti_regional_root_mac_str);
proto_tree_add_item(msti_tree, hf_bpdu_msti_internal_root_path_cost, tvb,
offset+ALT_MSTI_INTERNAL_ROOT_PATH_COST, 4, ENC_BIG_ENDIAN);
msti_bridge_identifier_priority = tvb_get_ntohs(tvb, offset+ALT_MSTI_BRIDGE_IDENTIFIER);
msti_bridge_identifier_mac_str = tvb_ether_to_str(tvb, ALT_MSTI_BRIDGE_IDENTIFIER + 2);
proto_tree_add_text(msti_tree, tvb, offset+ALT_MSTI_BRIDGE_IDENTIFIER, 8,
"MSTI Bridge Identifier: %d / %d / %s",
msti_bridge_identifier_priority & 0x0fff,
msti_bridge_identifier_priority & 0xf000,
msti_bridge_identifier_mac_str);
msti_port_identifier_priority = tvb_get_ntohs(tvb, offset+ALT_MSTI_PORT_IDENTIFIER);
proto_tree_add_uint(msti_tree, hf_bpdu_msti_port_id, tvb,
offset+ALT_MSTI_PORT_IDENTIFIER, 2, msti_port_identifier_priority);
proto_tree_add_item(msti_tree, hf_bpdu_msti_remaining_hops, tvb,
offset + ALT_MSTI_REMAINING_HOPS, 1, ENC_BIG_ENDIAN);
msti_length_remaining -= ALT_MSTI_MESSAGE_SIZE;
offset += ALT_MSTI_MESSAGE_SIZE;
break;
}
msti++;
}
if (protocol_version_identifier >= 4 && version_1_length == 0
&& tvb_reported_length(tvb) >= 106) {
/*
* OK, it passes the "Protocol Identifier is 0000 0000
* 0000 0000", "Protocol Version Identifier is 4 or
* greater", "BPDU Type is 0000 0010", "contains 106 or
* more octets", and "a Version 1 Length of 0" tests.
*/
bpdu_version_4_length = BPDU_MSTI + total_msti_length;
version_4_length = tvb_get_ntohs(tvb, bpdu_version_4_length);
proto_tree_add_uint(bpdu_tree, hf_bpdu_version_4_length, tvb,
bpdu_version_4_length, 2, version_4_length);
/* version 4 length is 55 or more.
*/
if (version_4_length >= 53) {
spt_item = proto_tree_add_text(bpdu_tree, tvb,
bpdu_version_4_length, -1, "SPT Extension");
spt_tree = proto_item_add_subtree(spt_item, ett_spt);
spt_offset = (bpdu_version_4_length + 2);
/* Aux MCID: */
aux_mcid_item = proto_tree_add_text(spt_tree, tvb, spt_offset,
MCID_LEN, "MCID Data");
aux_mcid_tree = proto_item_add_subtree(aux_mcid_item, ett_aux_mcid);
proto_tree_add_item(aux_mcid_tree,
hf_bpdu_spt_config_format_selector, tvb, spt_offset, 1,
ENC_BIG_ENDIAN);
proto_tree_add_item(aux_mcid_tree, hf_bpdu_spt_config_name, tvb,
spt_offset + 1, 32, ENC_ASCII | ENC_NA);
proto_tree_add_item(aux_mcid_tree,
hf_bpdu_spt_config_revision_level, tvb, spt_offset + 33,
2, ENC_BIG_ENDIAN);
proto_tree_add_item(aux_mcid_tree, hf_bpdu_spt_config_digest,
tvb, spt_offset + 35, 16, ENC_NA);
spt_offset += MCID_LEN;
/* Agreement Data */
agreement_item = proto_tree_add_text(spt_tree, tvb, spt_offset,
-1, "Agreement Data");
agreement_tree = proto_item_add_subtree(agreement_item, ett_agreement);
spt_agree_data = tvb_get_guint8(tvb, spt_offset);
sep = initial_sep;
if (agreement_item) {
agree_num = (spt_agree_data & 0x03);
proto_item_append_text(agreement_item, "%sAN: %d", sep, agree_num );
}
proto_tree_add_uint(agreement_tree, hf_bpdu_flags_agree_num,
tvb, spt_offset, 1, spt_agree_data);
sep = cont_sep;
if (agreement_item) {
dagree_num = ((spt_agree_data & 0x0C) >> 2);
proto_item_append_text(agreement_item, "%sDAN: %d", sep, dagree_num);
}
proto_tree_add_uint(agreement_tree, hf_bpdu_flags_dagree_num,
tvb, spt_offset, 1, spt_agree_data);
proto_tree_add_boolean(agreement_tree, hf_bpdu_flags_agree_valid,
tvb, spt_offset, 1, spt_agree_data);
proto_tree_add_boolean(agreement_tree, hf_bpdu_flags_restricted_role,
tvb, spt_offset, 1, spt_agree_data);
if (sep != initial_sep) {
proto_item_append_text(agreement_item, ")");
}
spt_offset += 2;
spt_agree_data = tvb_get_guint8(tvb, spt_offset);
proto_tree_add_text(agreement_tree, tvb, spt_offset, 1,
"Agreement Digest Format Id: %d",
(spt_agree_data & 0xf0) >> 4);
proto_tree_add_text(agreement_tree, tvb, spt_offset, 1,
"Agreement Digest Format Capabilites: %d",
(spt_agree_data & 0x0f));
spt_offset += 1;
spt_agree_data = tvb_get_guint8(tvb, spt_offset);
proto_tree_add_text(agreement_tree, tvb, spt_offset, 1,
"Agreement Digest Convention Id: %d",
(spt_agree_data & 0xf0) >> 4);
proto_tree_add_text(agreement_tree, tvb, spt_offset, 1,
"Agreement Digest Convention Capabilites: %d",
(spt_agree_data & 0x0f));
spt_offset += 1;
spt_edge_count = tvb_get_ntohs(tvb, spt_offset);
proto_tree_add_text(agreement_tree, tvb, spt_offset, 2,
"Agreement Digest Edge Count: %d", spt_edge_count);
spt_offset += 10;
proto_tree_add_item(agreement_tree, hf_bpdu_spt_agreement_digest,
tvb, spt_offset, 20, ENC_NA);
spt_offset += 20;
if (protocol_version_identifier == 4) {
set_actual_length(tvb, (bpdu_version_4_length + version_4_length + 2));
}
}
}
}
}
}
void
proto_register_bpdu(void)
{
static hf_register_info hf[] = {
{ &hf_bpdu_proto_id,
{ "Protocol Identifier", "stp.protocol",
FT_UINT16, BASE_HEX, VALS(protocol_id_vals), 0x0,
NULL, HFILL }},
{ &hf_bpdu_version_id,
{ "Protocol Version Identifier", "stp.version",
FT_UINT8, BASE_DEC, VALS(version_id_vals), 0x0,
NULL, HFILL }},
{ &hf_bpdu_type,
{ "BPDU Type", "stp.type",
FT_UINT8, BASE_HEX, VALS(bpdu_type_vals), 0x0,
NULL, HFILL }},
{ &hf_bpdu_flags,
{ "BPDU flags", "stp.flags",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_flags_tcack,
{ "Topology Change Acknowledgment", "stp.flags.tcack",
FT_BOOLEAN, 8, TFS(&tfs_yes_no), BPDU_FLAGS_TCACK,
NULL, HFILL }},
{ &hf_bpdu_flags_agreement,
{ "Agreement", "stp.flags.agreement",
FT_BOOLEAN, 8, TFS(&tfs_yes_no), BPDU_FLAGS_AGREEMENT,
NULL, HFILL }},
{ &hf_bpdu_flags_forwarding,
{ "Forwarding", "stp.flags.forwarding",
FT_BOOLEAN, 8, TFS(&tfs_yes_no), BPDU_FLAGS_FORWARDING,
NULL, HFILL }},
{ &hf_bpdu_flags_learning,
{ "Learning", "stp.flags.learning",
FT_BOOLEAN, 8, TFS(&tfs_yes_no), BPDU_FLAGS_LEARNING,
NULL, HFILL }},
{ &hf_bpdu_flags_port_role,
{ "Port Role", "stp.flags.port_role",
FT_UINT8, BASE_DEC, VALS(role_vals), BPDU_FLAGS_PORT_ROLE_MASK,
NULL, HFILL }},
{ &hf_bpdu_flags_proposal,
{ "Proposal", "stp.flags.proposal",
FT_BOOLEAN, 8, TFS(&tfs_yes_no), BPDU_FLAGS_PROPOSAL,
NULL, HFILL }},
{ &hf_bpdu_flags_tc,
{ "Topology Change", "stp.flags.tc",
FT_BOOLEAN, 8, TFS(&tfs_yes_no), BPDU_FLAGS_TC,
NULL, HFILL }},
{ &hf_bpdu_root_prio,
{ "Root Bridge Priority", "stp.root.prio",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_root_sys_id_ext,
{ "Root Bridge System ID Extension", "stp.root.ext",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_root_mac,
{ "Root Bridge System ID", "stp.root.hw",
FT_ETHER, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_root_cost,
{ "Root Path Cost", "stp.root.cost",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_bridge_prio,
{ "Bridge Priority", "stp.bridge.prio",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_bridge_sys_id_ext,
{ "Bridge System ID Extension", "stp.bridge.ext",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_bridge_mac,
{ "Bridge System ID", "stp.bridge.hw",
FT_ETHER, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_port_id,
{ "Port identifier", "stp.port",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_msg_age,
{ "Message Age", "stp.msg_age",
FT_DOUBLE, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_max_age,
{ "Max Age", "stp.max_age",
FT_DOUBLE, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_hello_time,
{ "Hello Time", "stp.hello",
FT_DOUBLE, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_forward_delay,
{ "Forward Delay", "stp.forward",
FT_DOUBLE, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_version_1_length,
{ "Version 1 Length", "stp.version_1_length",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_version_3_length,
{ "Version 3 Length", "mstp.version_3_length",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_mst_config_format_selector,
{ "MST Config ID format selector", "mstp.config_format_selector",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_mst_config_name,
{ "MST Config name", "mstp.config_name",
FT_STRINGZ, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_mst_config_revision_level,
{ "MST Config revision", "mstp.config_revision_level",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_mst_config_digest,
{ "MST Config digest", "mstp.config_digest",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_cist_internal_root_path_cost,
{ "CIST Internal Root Path Cost", "mstp.cist_internal_root_path_cost",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_cist_bridge_prio,
{ "CIST Bridge Priority", "mstp.cist_bridge.prio",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_cist_bridge_sys_id_ext,
{ "CIST Bridge Identifier System ID Extension", "mstp.cist_bridge.ext",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_cist_bridge_mac,
{ "CIST Bridge Identifier System ID", "mstp.cist_bridge.hw",
FT_ETHER, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_cist_remaining_hops,
{ "CIST Remaining hops", "mstp.cist_remaining_hops",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_msti_flags,
{ "MSTI flags", "mstp.msti.flags",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_msti_regional_root_mac,
{ "Regional Root", "mstp.msti.root.hw",
FT_ETHER, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_msti_internal_root_path_cost,
{ "Internal root path cost", "mstp.msti.root_cost",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_msti_bridge_identifier_priority,
{ "Bridge Identifier Priority", "mstp.msti.bridge_priority",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_msti_port_identifier_priority,
{ "Port identifier priority", "mstp.msti.port_priority",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_msti_port_id,
{ "Port identifier", "mstp.msti.port",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_msti_remaining_hops,
{ "Remaining hops", "mstp.msti.remaining_hops",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_version_4_length,
{ "Version 4 Length", "mstp.version_4_length",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_spt_config_format_selector,
{ "SPT Config ID format selector", "mstp.config_format_selector",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_bpdu_spt_config_name,
{"SPT Config name", "mstp.config_name",
FT_STRINGZ, BASE_NONE, NULL, 0x0,
NULL, HFILL } },
{ &hf_bpdu_spt_config_revision_level,
{ "SPT Config revision", "mstp.config_revision_level",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL } },
{ &hf_bpdu_spt_config_digest,
{ "SPT Config digest", "mstp.config_digest",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL } },
{ &hf_bpdu_flags_agree_num,
{ "Agreement Number", "mstp.agree_flags.agreement_num",
FT_UINT8, BASE_DEC, NULL, 0x03,
NULL, HFILL } },
{ &hf_bpdu_flags_dagree_num,
{ "Disagreement Number", "mstp.agree_flags.dagreement_num",
FT_UINT8, BASE_DEC, NULL, 0x0C,
NULL, HFILL } },
{ &hf_bpdu_flags_agree_valid,
{ "Agreement Valid Flag", "mstp.agree_flags.agreement_valid",
FT_BOOLEAN, 8, TFS(&tfs_yes_no), 0x10,
NULL, HFILL } },
{ &hf_bpdu_flags_restricted_role,
{ "Restricted Role", "mstp.agree_flags.rest_role",
FT_BOOLEAN, 8, TFS(&tfs_yes_no), 0x20,
NULL, HFILL } },
{ &hf_bpdu_spt_agreement_digest,
{ "Agreement Digest", "mstp.agreement_digest",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL } },
};
static gint *ett[] = {
&ett_bpdu,
&ett_bpdu_flags,
&ett_root_id,
&ett_bridge_id,
&ett_mstp,
&ett_msti,
&ett_cist_bridge_id,
&ett_spt,
&ett_aux_mcid,
&ett_agreement
};
module_t *bpdu_module;
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);
bpdu_module = prefs_register_protocol(proto_bpdu, NULL);
prefs_register_bool_preference(bpdu_module, "use_system_id_extension",
"Use 802.1t System ID Extensions",
"Whether the BPDU dissector should use 802.1t System ID Extensions when dissecting the Bridge Identifier",
&bpdu_use_system_id_extensions);
}
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_uint("llc.dsap", SAP_BPDU, bpdu_handle);
dissector_add_uint("chdlctype", CHDLCTYPE_BPDU, bpdu_handle);
dissector_add_uint("llc.cisco_pid", 0x010b, bpdu_handle);
dissector_add_uint("llc.cisco_pid", 0x010c, bpdu_handle);
dissector_add_uint("ethertype", ETHERTYPE_STP, bpdu_handle);
}
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