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-rw-r--r--packet-gvrp.c346
1 files changed, 346 insertions, 0 deletions
diff --git a/packet-gvrp.c b/packet-gvrp.c
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+++ b/packet-gvrp.c
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+/* packet-gvrp.c
+ * Routines for GVRP (GARP VLAN Registration Protocol) dissection
+ * Copyright 2000, Kevin Shi <techishi@ms22.hinet.net>
+ *
+ * $Id: packet-gvrp.c,v 1.1 2000/11/30 09:31:50 guy Exp $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@zing.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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+
+#ifdef HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#endif
+
+#include <glib.h>
+
+#ifdef NEED_SNPRINTF_H
+# include "snprintf.h"
+#endif
+
+#include "packet.h"
+#include "llcsaps.h"
+
+/* Initialize the protocol and registered fields */
+static int proto_gvrp = -1;
+static int hf_gvrp_proto_id = -1;
+static int hf_gvrp_attribute_type = -1;
+static int hf_gvrp_attribute_length = -1;
+static int hf_gvrp_attribute_event = -1;
+static int hf_gvrp_attribute_value = -1;
+static int hf_gvrp_end_of_mark = -1;
+
+/* Initialize the subtree pointers */
+static gint ett_gvrp = -1;
+static gint ett_gvrp_message = -1;
+static gint ett_gvrp_attribute_list = -1;
+static gint ett_gvrp_attribute = -1;
+
+/* Constant definitions */
+#define GARP_DEFAULT_PROTOCOL_ID 0x0001
+#define GARP_END_OF_MARK 0x00
+
+#define GVRP_ATTRIBUTE_TYPE 0x01
+
+static const value_string attribute_type_vals[] = {
+ { GVRP_ATTRIBUTE_TYPE, "VID" },
+ { 0, NULL }
+};
+
+/* The length of GVRP LeaveAll attribute should be 2 octets (one for length
+ * and the other for event) */
+#define GVRP_LENGTH_LEAVEALL (sizeof(guint8)+sizeof(guint8))
+
+/* The length of GVRP attribute other than LeaveAll should be 4 octets (one
+ * for length, one for event, and the last two for VID value).
+ */
+#define GVRP_LENGTH_NON_LEAVEALL (sizeof(guint8)+sizeof(guint8)+sizeof(guint16))
+
+/* Packet offset definitions */
+#define GARP_PROTOCOL_ID 0
+
+/* Event definitions */
+#define GVRP_EVENT_LEAVEALL 0
+#define GVRP_EVENT_JOINEMPTY 1
+#define GVRP_EVENT_JOININ 2
+#define GVRP_EVENT_LEAVEEMPTY 3
+#define GVRP_EVENT_LEAVEIN 4
+#define GVRP_EVENT_EMPTY 5
+
+static const value_string event_vals[] = {
+ { GVRP_EVENT_LEAVEALL, "Leave All" },
+ { GVRP_EVENT_JOINEMPTY, "Join Empty" },
+ { GVRP_EVENT_JOININ, "Join In" },
+ { GVRP_EVENT_LEAVEEMPTY, "Leave Empty" },
+ { GVRP_EVENT_LEAVEIN, "Leave In" },
+ { GVRP_EVENT_EMPTY, "Empty" },
+ { 0, NULL }
+};
+
+/* Code to actually dissect the packets */
+void
+dissect_gvrp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+ proto_item *ti;
+ proto_tree *gvrp_tree;
+ guint16 protocol_id;
+ guint8 octet;
+ int msg_index, attr_index, offset = 0, length = tvb_reported_length(tvb);
+
+ CHECK_DISPLAY_AS_DATA(proto_gvrp, tvb, pinfo, tree);
+
+ pinfo->current_proto = "GVRP";
+
+ if (check_col(pinfo->fd, COL_PROTOCOL))
+ col_set_str(pinfo->fd, COL_PROTOCOL, "GVRP");
+
+ if (check_col(pinfo->fd, COL_INFO))
+ col_set_str(pinfo->fd, COL_INFO, "GVRP");
+
+ if (tree)
+ {
+ ti = proto_tree_add_item(tree, proto_gvrp, tvb, 0, length, FALSE);
+
+ gvrp_tree = proto_item_add_subtree(ti, ett_gvrp);
+
+ /* Read in GARP protocol ID */
+ protocol_id = tvb_get_ntohs(tvb, GARP_PROTOCOL_ID);
+
+ proto_tree_add_uint_format(gvrp_tree, hf_gvrp_proto_id, tvb,
+ GARP_PROTOCOL_ID, sizeof(guint16),
+ protocol_id,
+ "Protocol Identifier: 0x%04x (%s)",
+ protocol_id,
+ protocol_id == GARP_DEFAULT_PROTOCOL_ID ?
+ "GARP VLAN Registration Protocol" :
+ "Unknown Protocol");
+
+ /* Currently only one protocol ID is supported */
+ if (protocol_id != GARP_DEFAULT_PROTOCOL_ID)
+ {
+ proto_tree_add_text(gvrp_tree, tvb, GARP_PROTOCOL_ID, sizeof(guint16),
+ " (Warning: this version of Ethereal only knows about protocol id = 1)");
+ dissect_data(tvb, GARP_PROTOCOL_ID + sizeof(guint16), pinfo, tree);
+ return;
+ }
+
+ offset += sizeof(guint16);
+ length -= sizeof(guint16);
+
+ msg_index = 0;
+
+ /* Begin to parse GARP messages */
+ while (length)
+ {
+ proto_item *msg_item;
+ int msg_start = offset;
+
+ /* Read in attribute type. */
+ octet = tvb_get_guint8(tvb, offset);
+
+ /* Check for end of mark */
+ if (octet == GARP_END_OF_MARK)
+ {
+ /* End of GARP PDU */
+ if (msg_index)
+ {
+ proto_tree_add_text(gvrp_tree, tvb, offset, sizeof(guint8),
+ "End of mark");
+ break;
+ }
+ else
+ {
+ dissect_data(tvb, offset, pinfo, tree);
+ return;
+ }
+ }
+
+ offset += sizeof(guint8);
+ length -= sizeof(guint8);
+
+ msg_item = proto_tree_add_text(gvrp_tree, tvb, msg_start, 0,
+ "Message %d", msg_index + 1);
+
+ proto_tree_add_uint(gvrp_tree, hf_gvrp_attribute_type, tvb,
+ msg_start, sizeof(guint8), octet);
+
+ /* GVRP only supports one attribute type. */
+ if (octet != GVRP_ATTRIBUTE_TYPE)
+ {
+ dissect_data(tvb, offset, pinfo, tree);
+ return;
+ }
+
+ attr_index = 0;
+
+ while (length)
+ {
+ int attr_start = offset;
+ proto_item *attr_item;
+
+ /* Read in attribute length. */
+ octet = tvb_get_guint8(tvb, offset);
+
+ /* Check for end of mark */
+ if (octet == GARP_END_OF_MARK)
+ {
+ /* If at least one message has been already read,
+ * check for another end of mark.
+ */
+ if (attr_index)
+ {
+ proto_tree_add_text(gvrp_tree, tvb, offset,
+ sizeof(guint8), " End of mark");
+
+ offset += sizeof(guint8);
+ length -= sizeof(guint8);
+
+ proto_item_set_len(msg_item, offset - msg_start);
+ break;
+ }
+ else
+ {
+ dissect_data(tvb, offset, pinfo, tree);
+ return;
+ }
+ }
+ else
+ {
+ guint8 event;
+
+ offset += sizeof(guint8);
+ length -= sizeof(guint8);
+
+ attr_item = proto_tree_add_text(gvrp_tree, tvb,
+ attr_start, 0, " Attribute %d", attr_index + 1);
+
+ proto_tree_add_uint(gvrp_tree, hf_gvrp_attribute_length,
+ tvb, attr_start, sizeof(guint8), octet);
+
+ /* Read in attribute event */
+ event = tvb_get_guint8(tvb, offset);
+
+ proto_tree_add_uint(gvrp_tree, hf_gvrp_attribute_event,
+ tvb, offset, sizeof(guint8), event);
+
+ offset += sizeof(guint8);
+ length -= sizeof(guint8);
+
+ switch (event) {
+
+ case GVRP_EVENT_LEAVEALL:
+ if (octet != GVRP_LENGTH_LEAVEALL)
+ {
+ dissect_data(tvb, offset, pinfo, tree);
+ return;
+ }
+ break;
+
+ case GVRP_EVENT_JOINEMPTY:
+ case GVRP_EVENT_JOININ:
+ case GVRP_EVENT_LEAVEEMPTY:
+ case GVRP_EVENT_LEAVEIN:
+ case GVRP_EVENT_EMPTY:
+ if (octet != GVRP_LENGTH_NON_LEAVEALL)
+ {
+ dissect_data(tvb, offset, pinfo, tree);
+ return;
+ }
+
+ /* Show attribute value */
+ proto_tree_add_item(gvrp_tree, hf_gvrp_attribute_value,
+ tvb, offset, sizeof(guint16), FALSE);
+
+ offset += sizeof(guint16);
+ length -= sizeof(guint16);
+ break;
+
+ default:
+ dissect_data(tvb, offset, pinfo, tree);
+ return;
+ }
+ }
+
+ proto_item_set_len(attr_item, offset - attr_start);
+
+ attr_index++;
+ }
+
+ msg_index++;
+ }
+ }
+}
+
+
+/* Register the protocol with Ethereal */
+void
+proto_register_gvrp(void)
+{
+ static hf_register_info hf[] = {
+ { &hf_gvrp_proto_id,
+ { "Protocol ID", "garp.protocol_id",
+ FT_UINT16, BASE_HEX, NULL, 0x0,
+ "" }
+ },
+ { &hf_gvrp_attribute_type,
+ { "Type", "garp.attribute_type",
+ FT_UINT8, BASE_HEX, VALS(attribute_type_vals), 0x0,
+ "" }
+ },
+ { &hf_gvrp_attribute_length,
+ { "Length", "garp.attribute_length",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "" }
+ },
+ { &hf_gvrp_attribute_event,
+ { "Event", "garp.attribute_event",
+ FT_UINT8, BASE_DEC, VALS(event_vals), 0x0,
+ "" }
+ },
+ { &hf_gvrp_attribute_value,
+ { "Value", "garp.attribute_value",
+ FT_UINT16, BASE_DEC, NULL, 0x0,
+ "" }
+ }
+ };
+
+ static gint *ett[] = {
+ &ett_gvrp
+ };
+
+ /* Register the protocol name and description for GVRP */
+ proto_gvrp = proto_register_protocol("GARP VLAN Registration Protocol",
+ "GVRP");
+
+ /* Required function calls to register the header fields and subtrees
+ * used by GVRP */
+ proto_register_field_array(proto_gvrp, hf, array_length(hf));
+ proto_register_subtree_array(ett, array_length(ett));
+}
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