2 * Routines for GVRP (GARP VLAN Registration Protocol) dissection
3 * Copyright 2000, Kevin Shi <techishi@ms22.hinet.net>
5 * $Id: packet-gvrp.c,v 1.8 2001/12/10 00:25:28 guy Exp $
7 * Ethereal - Network traffic analyzer
8 * By Gerald Combs <gerald@ethereal.com>
9 * Copyright 1998 Gerald Combs
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
34 #ifdef HAVE_SYS_TYPES_H
35 # include <sys/types.h>
38 #ifdef HAVE_NETINET_IN_H
39 # include <netinet/in.h>
44 #ifdef NEED_SNPRINTF_H
45 # include "snprintf.h"
51 /* Initialize the protocol and registered fields */
52 static int proto_gvrp = -1;
53 static int hf_gvrp_proto_id = -1;
54 static int hf_gvrp_attribute_type = -1;
55 static int hf_gvrp_attribute_length = -1;
56 static int hf_gvrp_attribute_event = -1;
57 static int hf_gvrp_attribute_value = -1;
58 /*static int hf_gvrp_end_of_mark = -1;*/
60 /* Initialize the subtree pointers */
61 static gint ett_gvrp = -1;
62 /*static gint ett_gvrp_message = -1;
63 static gint ett_gvrp_attribute_list = -1;
64 static gint ett_gvrp_attribute = -1;*/
66 static dissector_handle_t data_handle;
68 /* Constant definitions */
69 #define GARP_DEFAULT_PROTOCOL_ID 0x0001
70 #define GARP_END_OF_MARK 0x00
72 #define GVRP_ATTRIBUTE_TYPE 0x01
74 static const value_string attribute_type_vals[] = {
75 { GVRP_ATTRIBUTE_TYPE, "VID" },
79 /* The length of GVRP LeaveAll attribute should be 2 octets (one for length
80 * and the other for event) */
81 #define GVRP_LENGTH_LEAVEALL (sizeof(guint8)+sizeof(guint8))
83 /* The length of GVRP attribute other than LeaveAll should be 4 octets (one
84 * for length, one for event, and the last two for VID value).
86 #define GVRP_LENGTH_NON_LEAVEALL (sizeof(guint8)+sizeof(guint8)+sizeof(guint16))
88 /* Packet offset definitions */
89 #define GARP_PROTOCOL_ID 0
91 /* Event definitions */
92 #define GVRP_EVENT_LEAVEALL 0
93 #define GVRP_EVENT_JOINEMPTY 1
94 #define GVRP_EVENT_JOININ 2
95 #define GVRP_EVENT_LEAVEEMPTY 3
96 #define GVRP_EVENT_LEAVEIN 4
97 #define GVRP_EVENT_EMPTY 5
99 static const value_string event_vals[] = {
100 { GVRP_EVENT_LEAVEALL, "Leave All" },
101 { GVRP_EVENT_JOINEMPTY, "Join Empty" },
102 { GVRP_EVENT_JOININ, "Join In" },
103 { GVRP_EVENT_LEAVEEMPTY, "Leave Empty" },
104 { GVRP_EVENT_LEAVEIN, "Leave In" },
105 { GVRP_EVENT_EMPTY, "Empty" },
109 /* Code to actually dissect the packets */
111 dissect_gvrp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
114 proto_tree *gvrp_tree;
117 int msg_index, attr_index, offset = 0, length = tvb_reported_length(tvb);
119 if (check_col(pinfo->cinfo, COL_PROTOCOL))
120 col_set_str(pinfo->cinfo, COL_PROTOCOL, "GVRP");
122 if (check_col(pinfo->cinfo, COL_INFO))
123 col_set_str(pinfo->cinfo, COL_INFO, "GVRP");
127 ti = proto_tree_add_item(tree, proto_gvrp, tvb, 0, length, FALSE);
129 gvrp_tree = proto_item_add_subtree(ti, ett_gvrp);
131 /* Read in GARP protocol ID */
132 protocol_id = tvb_get_ntohs(tvb, GARP_PROTOCOL_ID);
134 proto_tree_add_uint_format(gvrp_tree, hf_gvrp_proto_id, tvb,
135 GARP_PROTOCOL_ID, sizeof(guint16),
137 "Protocol Identifier: 0x%04x (%s)",
139 protocol_id == GARP_DEFAULT_PROTOCOL_ID ?
140 "GARP VLAN Registration Protocol" :
143 /* Currently only one protocol ID is supported */
144 if (protocol_id != GARP_DEFAULT_PROTOCOL_ID)
146 proto_tree_add_text(gvrp_tree, tvb, GARP_PROTOCOL_ID, sizeof(guint16),
147 " (Warning: this version of Ethereal only knows about protocol id = 1)");
148 call_dissector(data_handle,tvb_new_subset(tvb, GARP_PROTOCOL_ID + sizeof(guint16), -1,tvb_reported_length_remaining(tvb,GARP_PROTOCOL_ID + sizeof(guint16))), pinfo, tree);
152 offset += sizeof(guint16);
153 length -= sizeof(guint16);
157 /* Begin to parse GARP messages */
160 proto_item *msg_item;
161 int msg_start = offset;
163 /* Read in attribute type. */
164 octet = tvb_get_guint8(tvb, offset);
166 /* Check for end of mark */
167 if (octet == GARP_END_OF_MARK)
169 /* End of GARP PDU */
172 proto_tree_add_text(gvrp_tree, tvb, offset, sizeof(guint8),
178 call_dissector(data_handle,tvb_new_subset(tvb, offset, -1,tvb_reported_length_remaining(tvb,offset)),pinfo, tree);
183 offset += sizeof(guint8);
184 length -= sizeof(guint8);
186 msg_item = proto_tree_add_text(gvrp_tree, tvb, msg_start, 0,
187 "Message %d", msg_index + 1);
189 proto_tree_add_uint(gvrp_tree, hf_gvrp_attribute_type, tvb,
190 msg_start, sizeof(guint8), octet);
192 /* GVRP only supports one attribute type. */
193 if (octet != GVRP_ATTRIBUTE_TYPE)
195 call_dissector(data_handle,tvb_new_subset(tvb, offset,-1,tvb_reported_length_remaining(tvb,offset)), pinfo, tree);
203 int attr_start = offset;
204 proto_item *attr_item;
206 /* Read in attribute length. */
207 octet = tvb_get_guint8(tvb, offset);
209 /* Check for end of mark */
210 if (octet == GARP_END_OF_MARK)
212 /* If at least one message has been already read,
213 * check for another end of mark.
217 proto_tree_add_text(gvrp_tree, tvb, offset,
218 sizeof(guint8), " End of mark");
220 offset += sizeof(guint8);
221 length -= sizeof(guint8);
223 proto_item_set_len(msg_item, offset - msg_start);
228 call_dissector(data_handle,tvb_new_subset(tvb, offset,-1,tvb_reported_length_remaining(tvb,offset)), pinfo, tree);
236 offset += sizeof(guint8);
237 length -= sizeof(guint8);
239 attr_item = proto_tree_add_text(gvrp_tree, tvb,
240 attr_start, 0, " Attribute %d", attr_index + 1);
242 proto_tree_add_uint(gvrp_tree, hf_gvrp_attribute_length,
243 tvb, attr_start, sizeof(guint8), octet);
245 /* Read in attribute event */
246 event = tvb_get_guint8(tvb, offset);
248 proto_tree_add_uint(gvrp_tree, hf_gvrp_attribute_event,
249 tvb, offset, sizeof(guint8), event);
251 offset += sizeof(guint8);
252 length -= sizeof(guint8);
256 case GVRP_EVENT_LEAVEALL:
257 if (octet != GVRP_LENGTH_LEAVEALL)
259 call_dissector(data_handle,tvb_new_subset(tvb, offset, -1,tvb_reported_length_remaining(tvb,offset)),pinfo, tree);
264 case GVRP_EVENT_JOINEMPTY:
265 case GVRP_EVENT_JOININ:
266 case GVRP_EVENT_LEAVEEMPTY:
267 case GVRP_EVENT_LEAVEIN:
268 case GVRP_EVENT_EMPTY:
269 if (octet != GVRP_LENGTH_NON_LEAVEALL)
271 call_dissector(data_handle,tvb_new_subset(tvb, offset, -1,tvb_reported_length_remaining(tvb,offset)),pinfo, tree);
275 /* Show attribute value */
276 proto_tree_add_item(gvrp_tree, hf_gvrp_attribute_value,
277 tvb, offset, sizeof(guint16), FALSE);
279 offset += sizeof(guint16);
280 length -= sizeof(guint16);
284 call_dissector(data_handle,tvb_new_subset(tvb, offset, -1,tvb_reported_length_remaining(tvb,offset)),pinfo, tree);
289 proto_item_set_len(attr_item, offset - attr_start);
300 /* Register the protocol with Ethereal */
302 proto_register_gvrp(void)
304 static hf_register_info hf[] = {
306 { "Protocol ID", "garp.protocol_id",
307 FT_UINT16, BASE_HEX, NULL, 0x0,
310 { &hf_gvrp_attribute_type,
311 { "Type", "garp.attribute_type",
312 FT_UINT8, BASE_HEX, VALS(attribute_type_vals), 0x0,
315 { &hf_gvrp_attribute_length,
316 { "Length", "garp.attribute_length",
317 FT_UINT8, BASE_DEC, NULL, 0x0,
320 { &hf_gvrp_attribute_event,
321 { "Event", "garp.attribute_event",
322 FT_UINT8, BASE_DEC, VALS(event_vals), 0x0,
325 { &hf_gvrp_attribute_value,
326 { "Value", "garp.attribute_value",
327 FT_UINT16, BASE_DEC, NULL, 0x0,
332 static gint *ett[] = {
336 /* Register the protocol name and description for GVRP */
337 proto_gvrp = proto_register_protocol("GARP VLAN Registration Protocol",
340 /* Required function calls to register the header fields and subtrees
342 proto_register_field_array(proto_gvrp, hf, array_length(hf));
343 proto_register_subtree_array(ett, array_length(ett));
345 register_dissector("gvrp", dissect_gvrp, proto_gvrp);
349 proto_reg_handoff_gvrp(void){
350 data_handle = find_dissector("data");