forked from osmocom/wireshark
345 lines
12 KiB
C
345 lines
12 KiB
C
/* packet-gvrp.c
|
|
* Routines for GVRP (GARP VLAN Registration Protocol) dissection
|
|
* Copyright 2000, Kevin Shi <techishi@ms22.hinet.net>
|
|
*
|
|
* $Id$
|
|
*
|
|
* 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>
|
|
|
|
/* 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;*/
|
|
|
|
static dissector_handle_t data_handle;
|
|
|
|
/* 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 (int)(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 (int)(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 */
|
|
static 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;
|
|
int attr_index;
|
|
int offset = 0;
|
|
int length = tvb_reported_length(tvb);
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "GVRP");
|
|
|
|
col_set_str(pinfo->cinfo, COL_INFO, "GVRP");
|
|
|
|
if (tree)
|
|
{
|
|
ti = proto_tree_add_item(tree, proto_gvrp, tvb, 0, length, ENC_NA);
|
|
|
|
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, (int)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, (int)sizeof(guint16),
|
|
" (Warning: this version of Wireshark only knows about protocol id = 1)");
|
|
call_dissector(data_handle,
|
|
tvb_new_subset(tvb, GARP_PROTOCOL_ID + (int)sizeof(guint16), -1, -1),
|
|
pinfo, tree);
|
|
return;
|
|
}
|
|
|
|
offset += (int)sizeof(guint16);
|
|
length -= (int)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, (int)sizeof(guint8),
|
|
"End of mark");
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
call_dissector(data_handle,
|
|
tvb_new_subset_remaining(tvb, offset), pinfo, tree);
|
|
return;
|
|
}
|
|
}
|
|
|
|
offset += (int)sizeof(guint8);
|
|
length -= (int)sizeof(guint8);
|
|
|
|
msg_item = proto_tree_add_text(gvrp_tree, tvb, msg_start, -1,
|
|
"Message %d", msg_index + 1);
|
|
|
|
proto_tree_add_uint(gvrp_tree, hf_gvrp_attribute_type, tvb,
|
|
msg_start, (int)sizeof(guint8), octet);
|
|
|
|
/* GVRP only supports one attribute type. */
|
|
if (octet != GVRP_ATTRIBUTE_TYPE)
|
|
{
|
|
call_dissector(data_handle, tvb_new_subset_remaining(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,
|
|
(int)sizeof(guint8), " End of mark");
|
|
|
|
offset += (int)sizeof(guint8);
|
|
length -= (int)sizeof(guint8);
|
|
|
|
proto_item_set_len(msg_item, offset - msg_start);
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
call_dissector(data_handle,
|
|
tvb_new_subset_remaining(tvb, offset), pinfo, tree);
|
|
return;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
guint8 event;
|
|
|
|
offset += (int)sizeof(guint8);
|
|
length -= (int)sizeof(guint8);
|
|
|
|
attr_item = proto_tree_add_text(gvrp_tree, tvb,
|
|
attr_start, -1, " Attribute %d", attr_index + 1);
|
|
|
|
proto_tree_add_uint(gvrp_tree, hf_gvrp_attribute_length,
|
|
tvb, attr_start, (int)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, (int)sizeof(guint8), event);
|
|
|
|
offset += (int)sizeof(guint8);
|
|
length -= (int)sizeof(guint8);
|
|
|
|
switch (event) {
|
|
|
|
case GVRP_EVENT_LEAVEALL:
|
|
if (octet != GVRP_LENGTH_LEAVEALL)
|
|
{
|
|
call_dissector(data_handle,
|
|
tvb_new_subset_remaining(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)
|
|
{
|
|
call_dissector(data_handle,
|
|
tvb_new_subset_remaining(tvb, offset),pinfo,
|
|
tree);
|
|
return;
|
|
}
|
|
|
|
/* Show attribute value */
|
|
proto_tree_add_item(gvrp_tree, hf_gvrp_attribute_value,
|
|
tvb, offset, (int)sizeof(guint16), ENC_BIG_ENDIAN);
|
|
|
|
offset += (int)sizeof(guint16);
|
|
length -= (int)sizeof (guint16);
|
|
break;
|
|
|
|
default:
|
|
call_dissector(data_handle,
|
|
tvb_new_subset_remaining(tvb, offset), pinfo, tree);
|
|
return;
|
|
}
|
|
}
|
|
|
|
proto_item_set_len(attr_item, offset - attr_start);
|
|
|
|
attr_index++;
|
|
}
|
|
|
|
msg_index++;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* Register the protocol with Wireshark */
|
|
void
|
|
proto_register_gvrp(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_gvrp_proto_id,
|
|
{ "Protocol ID", "gvrp.protocol_id",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_gvrp_attribute_type,
|
|
{ "Type", "gvrp.attribute_type",
|
|
FT_UINT8, BASE_HEX, VALS(attribute_type_vals), 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_gvrp_attribute_length,
|
|
{ "Length", "gvrp.attribute_length",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_gvrp_attribute_event,
|
|
{ "Event", "gvrp.attribute_event",
|
|
FT_UINT8, BASE_DEC, VALS(event_vals), 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_gvrp_attribute_value,
|
|
{ "Value", "gvrp.attribute_value",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
}
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_gvrp
|
|
};
|
|
|
|
/* Register the protocol name and description for GVRP */
|
|
proto_gvrp = proto_register_protocol("GARP VLAN Registration Protocol",
|
|
"GVRP", "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));
|
|
|
|
register_dissector("gvrp", dissect_gvrp, proto_gvrp);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_gvrp(void){
|
|
data_handle = find_dissector("data");
|
|
}
|