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-rw-r--r--epan/dissectors/packet-dec-bpdu.c300
1 files changed, 300 insertions, 0 deletions
diff --git a/epan/dissectors/packet-dec-bpdu.c b/epan/dissectors/packet-dec-bpdu.c
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+++ b/epan/dissectors/packet-dec-bpdu.c
@@ -0,0 +1,300 @@
+/* packet-dec-bpdu.c
+ * Routines for DEC BPDU (DEC Spanning Tree Protocol) disassembly
+ *
+ * $Id$
+ *
+ * Copyright 2001 Paul Ionescu <paul@acorp.ro>
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdio.h>
+#include <string.h>
+#include <glib.h>
+#include <epan/packet.h>
+#include <epan/resolv.h>
+#include "etypes.h"
+#include "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;
+
+ if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "DEC_STP");
+ }
+ if (check_col(pinfo->cinfo, COL_INFO)) {
+ 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);
+
+ }
+}
+
+static const true_false_string yesno = {
+ "Yes",
+ "No"
+};
+
+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,
+ "", HFILL }},
+ { &hf_dec_bpdu_type,
+ { "BPDU Type", "dec_stp.type",
+ FT_UINT8, BASE_DEC, VALS(&bpdu_type_vals), 0x0,
+ "", HFILL }},
+ { &hf_dec_bpdu_version_id,
+ { "BPDU Version", "dec_stp.version",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+ { &hf_dec_bpdu_flags,
+ { "BPDU flags", "dec_stp.flags",
+ FT_UINT8, BASE_HEX, NULL, 0x0,
+ "", HFILL }},
+ { &hf_dec_bpdu_flags_short_timers,
+ { "Use short timers", "dec_stp.flags.short_timers",
+ FT_BOOLEAN, 8, TFS(&yesno), BPDU_FLAGS_SHORT_TIMERS,
+ "", HFILL }},
+ { &hf_dec_bpdu_flags_tcack,
+ { "Topology Change Acknowledgment", "dec_stp.flags.tcack",
+ FT_BOOLEAN, 8, TFS(&yesno), BPDU_FLAGS_TCACK,
+ "", HFILL }},
+ { &hf_dec_bpdu_flags_tc,
+ { "Topology Change", "dec_stp.flags.tc",
+ FT_BOOLEAN, 8, TFS(&yesno), BPDU_FLAGS_TC,
+ "", HFILL }},
+ { &hf_dec_bpdu_root_pri,
+ { "Root Priority", "dec_stp.root.pri",
+ FT_UINT16, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+ { &hf_dec_bpdu_root_mac,
+ { "Root MAC", "dec_stp.root.mac",
+ FT_ETHER, BASE_NONE, NULL, 0x0,
+ "", HFILL }},
+ { &hf_dec_bpdu_root_cost,
+ { "Root Path Cost", "dec_stp.root.cost",
+ FT_UINT16, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+ { &hf_dec_bpdu_bridge_pri,
+ { "Bridge Priority", "dec_stp.bridge.pri",
+ FT_UINT16, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+ { &hf_dec_bpdu_bridge_mac,
+ { "Bridge MAC", "dec_stp.bridge.mac",
+ FT_ETHER, BASE_NONE, NULL, 0x0,
+ "", HFILL }},
+ { &hf_dec_bpdu_port_id,
+ { "Port identifier", "dec_stp.port",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+ { &hf_dec_bpdu_msg_age,
+ { "Message Age", "dec_stp.msg_age",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+ { &hf_dec_bpdu_hello_time,
+ { "Hello Time", "dec_stp.hello",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+ { &hf_dec_bpdu_max_age,
+ { "Max Age", "dec_stp.max_age",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+ { &hf_dec_bpdu_forward_delay,
+ { "Forward Delay", "dec_stp.forward",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", 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("ethertype", ETHERTYPE_DEC_LB, dec_bpdu_handle);
+ dissector_add("chdlctype", ETHERTYPE_DEC_LB, dec_bpdu_handle);
+ dissector_add("ppp.protocol", PPP_DEC_LB, dec_bpdu_handle);
+}
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