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/* packet-lwapp.c
*
* Routines for LWAPP encapsulated packet disassembly
* draft-calhoun-seamoby-lwapp-N (the current draft is 3)
*
* $Id: packet-lwapp.c,v 1.5 2003/12/16 19:58:45 guy Exp $
*
* Copyright (c) 2003 by David Frascone <dave@frascone.com>
*
* 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 <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <time.h>
#include <glib.h>
#include <epan/filesystem.h>
#include "xmlstub.h"
#include <epan/packet.h>
#include <epan/resolv.h>
#include "prefs.h"
#ifdef NEED_SNPRINTF_H
# include "snprintf.h"
#endif
#define LWAPP_FLAGS_T 0x04
#define LWAPP_FLAGS_F 0x02
#define LWAPP_FLAGS_FT 0x01
static gint proto_lwapp = -1;
static gint proto_lwapp_l3 = -1;
static gint proto_lwapp_control = -1;
static gint ett_lwapp = -1;
static gint ett_lwapp_l3 = -1;
static gint ett_lwapp_flags = -1;
static gint ett_lwapp_control = -1;
static gint hf_lwapp_version = -1;
static gint hf_lwapp_slotid = -1;
static gint hf_lwapp_flags_type = -1;
static gint hf_lwapp_flags_fragment = -1;
static gint hf_lwapp_flags_fragment_type = -1;
static gint hf_lwapp_fragment_id = -1;
static gint hf_lwapp_length = -1;
static gint hf_lwapp_rssi = -1;
static gint hf_lwapp_snr = -1;
static gint hf_lwapp_control = -1;
static gint hf_lwapp_control_mac = -1;
static gint hf_lwapp_control_type = -1;
static gint hf_lwapp_control_seq_no = -1;
static gint hf_lwapp_control_length = -1;
static dissector_handle_t eth_handle;
static dissector_handle_t wlan_handle;
static dissector_handle_t wlan_bsfc_handle;
static dissector_handle_t data_handle;
/* Set by preferences */
static gboolean swap_frame_control;
typedef struct {
guint8 flags;
guint8 fragmentId;
guint16 length;
guint8 rssi;
guint8 snr;
} LWAPP_Header;
typedef struct {
guint8 tag;
guint16 length;
} CNTL_Data_Header;
typedef struct {
guint8 type;
guint8 seqNo;
guint16 length;
} CNTL_Header;
typedef enum {
RESULT_CODE = 1,
MWAR_ADDR_PAYLOAD,
RAD_PAYLOAD,
RAD_SLOT_PAYLOAD,
RAD_NAME_PAYLOAD,
MWAR_PAYLOAD,
VAP_PAYLOAD,
STATION_CFG_PAYLOAD,
OPERATION_RATE_SET_PAYLOAD,
MULTI_DOMAIN_CAPABILITY_PAYLOAD,
MAC_OPERATION_PAYLOAD,
PHY_TX_POWER_PAYLOAD,
PHY_TX_POWER_LEVEL_PAYLOAD,
PHY_DSSS_PAYLOAD,
PHY_OFDM_PAYLOAD,
SUPPORTED_RATES_PAYLOAD,
AUTH_PAYLOAD,
TEST_PAYLOAD,
RRM_NEIGHBOR_CTRL_PAYLOAD,
RRM_NOISE_CTRL_PAYLOAD,
RRM_NOISE_DATA_PAYLOAD,
RRM_INTERFERENCE_CTRL_PAYLOAD,
RRM_INTERFERENCE_DATA_PAYLOAD,
RRM_LOAD_CTRL_PAYLOAD,
RRM_LOAD_DATA_PAYLOAD,
CHANGE_STATE_EVENT_PAYLOAD,
ADMIN_STATE_PAYLOAD,
DELETE_VAP_PAYLOAD,
ADD_MOBILE_PAYLOAD,
DELETE_MOBILE_PAYLOAD
} control_tags;
typedef enum
{
DISCOVERY_REQUEST = 1,
DISCOVERY_REPLY,
JOIN_REQUEST,
JOIN_REPLY,
HANDOFF_REQUEST,
HANDOFF_REPLY,
HANDOFF_COMMAND,
HANDOFF_RESPONSE,
HANDOFF_CONFIRM,
CONFIGURE_REQUEST,
CONFIGURE_RESPONSE,
CONFIGURE_COMMAND,
CONFIGURE_COMMAND_RES,
STATISTICS_INFO,
CHANGE_STATE_EVENT,
CHANGE_STATE_EVENT_RES,
RRM_CONTROL_REQ,
RRM_CONTROL_RES,
RRM_DATA_REQ,
RRM_DATA_RES,
ECHO_REQUEST,
ECHO_RESPONSE,
I_AM_UP_REQ,
I_AM_UP_RES
}CNTLMsgType;
const value_string control_msg_vals[] = {
{DISCOVERY_REQUEST, "DISCOVERY_REQUEST"},
{DISCOVERY_REPLY, "DISCOVERY_REPLY"},
{JOIN_REQUEST, "JOIN_REQUEST"},
{JOIN_REPLY, "JOIN_REPLY"},
{HANDOFF_REQUEST, "HANDOFF_REQUEST"},
{HANDOFF_REPLY, "HANDOFF_REPLY"},
{HANDOFF_COMMAND, "HANDOFF_COMMAND"},
{HANDOFF_RESPONSE, "HANDOFF_RESPONSE"},
{HANDOFF_CONFIRM, "HANDOFF_CONFIRM"},
{CONFIGURE_REQUEST, "CONFIGURE_REQUEST"},
{CONFIGURE_RESPONSE, "CONFIGURE_RESPONSE"},
{CONFIGURE_COMMAND, "CONFIGURE_COMMAND"},
{CONFIGURE_COMMAND_RES, "CONFIGURE_COMMAND_RES"},
{STATISTICS_INFO, "STATISTICS_INFO"},
{CHANGE_STATE_EVENT, "CHANGE_STATE_EVENT"},
{CHANGE_STATE_EVENT_RES, "CHANGE_STATE_EVENT_RES"},
{RRM_CONTROL_REQ, "RRM_CONTROL_REQ"},
{RRM_CONTROL_RES, "RRM_CONTROL_RES"},
{RRM_DATA_REQ, "RRM_DATA_REQ"},
{RRM_DATA_RES, "RRM_DATA_RES"},
{ECHO_REQUEST, "ECHO_REQUEST"},
{ECHO_RESPONSE, "ECHO_RESPONSE"},
{I_AM_UP_REQ, "I_AM_UP_REQ"},
{I_AM_UP_RES, "I_AM_UP_RES"},
{ 0, NULL}
};
const value_string control_tag_vals[] = {
{RESULT_CODE, "RESULT_CODE"},
{MWAR_ADDR_PAYLOAD, "MWAR_ADDR_PAYLOAD"},
{RAD_PAYLOAD, "RAD_PAYLOAD"},
{RAD_SLOT_PAYLOAD, "RAD_SLOT_PAYLOAD"},
{RAD_NAME_PAYLOAD, "RAD_NAME_PAYLOAD"},
{MWAR_PAYLOAD, "MWAR_PAYLOAD"},
{VAP_PAYLOAD, "VAP_PAYLOAD"},
{STATION_CFG_PAYLOAD, "STATION_CFG_PAYLOAD"},
{OPERATION_RATE_SET_PAYLOAD, "OPERATION_RATE_SET_PAYLOAD"},
{MULTI_DOMAIN_CAPABILITY_PAYLOAD, "MULTI_DOMAIN_CAPABILITY_PAYLOAD"},
{MAC_OPERATION_PAYLOAD, "MAC_OPERATION_PAYLOAD"},
{PHY_TX_POWER_PAYLOAD, "PHY_TX_POWER_PAYLOAD"},
{PHY_TX_POWER_LEVEL_PAYLOAD, "PHY_TX_POWER_LEVEL_PAYLOAD"},
{PHY_DSSS_PAYLOAD, "PHY_DSSS_PAYLOAD"},
{PHY_OFDM_PAYLOAD, "PHY_OFDM_PAYLOAD"},
{SUPPORTED_RATES_PAYLOAD, "SUPPORTED_RATES_PAYLOAD"},
{AUTH_PAYLOAD, "AUTH_PAYLOAD"},
{TEST_PAYLOAD, "TEST_PAYLOAD"},
{RRM_NEIGHBOR_CTRL_PAYLOAD, "RRM_NEIGHBOR_CTRL_PAYLOAD"},
{RRM_NOISE_CTRL_PAYLOAD, "RRM_NOISE_CTRL_PAYLOAD"},
{RRM_NOISE_DATA_PAYLOAD, "RRM_NOISE_DATA_PAYLOAD"},
{RRM_INTERFERENCE_CTRL_PAYLOAD, "RRM_INTERFERENCE_CTRL_PAYLOAD"},
{RRM_INTERFERENCE_DATA_PAYLOAD, "RRM_INTERFERENCE_DATA_PAYLOAD"},
{RRM_LOAD_CTRL_PAYLOAD, "RRM_LOAD_CTRL_PAYLOAD"},
{RRM_LOAD_DATA_PAYLOAD, "RRM_LOAD_DATA_PAYLOAD"},
{CHANGE_STATE_EVENT_PAYLOAD, "CHANGE_STATE_EVENT_PAYLOAD"},
{ADMIN_STATE_PAYLOAD, "ADMIN_STATE_PAYLOAD"},
{DELETE_VAP_PAYLOAD, "DELETE_VAP_PAYLOAD"},
{ADD_MOBILE_PAYLOAD, "ADD_MOBILE_PAYLOAD"},
{DELETE_MOBILE_PAYLOAD, "DELETE_MOBILE_PAYLOAD"},
{0, NULL}
};
static const true_false_string lwapp_flags_type = {
"LWAPP Control Packet" ,
"Encapsulated 80211"
};
static const true_false_string lwapp_set_truth = {
"Not Set",
"Set"
};
/*
* dissect lwapp control packets. This is not fully implemented,
* but it's a good start.
*/
static void dissect_control(tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree)
{
CNTL_Header header;
proto_tree *control_tree;
tvbuff_t *next_tvb;
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *ti;
size_t offset=0;
/* Make entries in Protocol column and Info column on summary display */
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "LWAPP");
if (check_col(pinfo->cinfo, COL_INFO)) {
col_clear(pinfo->cinfo, COL_INFO);
col_add_str(pinfo->cinfo, COL_INFO,
"CNTL ");
}
/* Copy our header */
tvb_memcpy(tvb, (guint8*) &header, offset, sizeof(header));
/*
* Fix the length (network byte ordering), and set our version &
* slot id
*/
header.length = g_ntohs(header.length);
if (check_col(pinfo->cinfo, COL_INFO)) {
col_append_str(pinfo->cinfo, COL_INFO,
val_to_str(header.type, control_msg_vals, "Bad Type: 0x%02x"));
}
/* In the interest of speed, if "tree" is NULL, don't do any work not
necessary to generate protocol tree items. */
if (tree) {
/* create display subtree for the protocol */
ti = proto_tree_add_item(tree, proto_lwapp_control, tvb, offset,
-1, FALSE);
control_tree = proto_item_add_subtree(ti, ett_lwapp_control);
proto_tree_add_uint(control_tree, hf_lwapp_control_type,
tvb, offset, 1, header.type);
offset++;
proto_tree_add_uint(control_tree, hf_lwapp_control_seq_no,
tvb, offset, 1, header.seqNo);
offset++;
proto_tree_add_uint(control_tree, hf_lwapp_control_length,
tvb, offset, 2, header.length);
offset += 2;
/* Dissect rest of packet as data */
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
call_dissector(data_handle,next_tvb, pinfo, tree);
}
} /* dissect_control */
/*
* This lwapp dissector assumes that there is an 802.3 header at
* the start of the packet, so it simply re-calls the ethernet
* dissector on the packet.
*/
static void dissect_lwapp_l3(tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree)
{
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *ti;
proto_tree *lwapp_tree;
size_t offset=0;
tvbuff_t *next_client;
/* Make entries in Protocol column and Info column on summary display */
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "LWAPP-L3");
if (check_col(pinfo->cinfo, COL_INFO)) {
col_clear(pinfo->cinfo, COL_INFO);
col_add_str(pinfo->cinfo, COL_INFO, "802.3 Packets over Layer 3");
}
if (tree) {
/* create display subtree for the protocol */
ti = proto_tree_add_item(tree, proto_lwapp_l3, tvb, offset,
-1, FALSE);
lwapp_tree = proto_item_add_subtree(ti, ett_lwapp_l3);
}
/* Dissect as Ethernet */
next_client = tvb_new_subset(tvb, 0, -1, -1);
call_dissector(eth_handle, next_client, pinfo, tree);
return;
} /* dissect_lwapp_l3*/
/*
* This dissector dissects the lwapp protocol itself. It assumes an
* lwapp payload in the data, and doesn't care whether the data was
* from a UDP packet, or a Layer 2 one.
*/
static void dissect_lwapp(tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree)
{
LWAPP_Header header;
guint8 slotId;
guint8 version;
proto_tree *lwapp_tree;
proto_tree *flags_tree;
tvbuff_t *next_client;
char dest_mac[6];
guint8 have_destmac=0;
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *ti;
size_t offset=0;
/* Make entries in Protocol column and Info column on summary display */
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "LWAPP");
if (check_col(pinfo->cinfo, COL_INFO)) {
col_clear(pinfo->cinfo, COL_INFO);
col_add_str(pinfo->cinfo, COL_INFO,
"LWAPP IP or Layer 2");
}
/* First, set up our dest mac, if we're a control packet with a
* dest of port 12223 */
if (pinfo->destport == 12223 ) {
tvb_memcpy(tvb, (guint8*)dest_mac, offset, 6);
have_destmac = 1;
/* Copy our header */
tvb_memcpy(tvb, (guint8*) &header, offset + 6, sizeof(header));
} else {
/* Copy our header */
tvb_memcpy(tvb, (guint8*) &header, offset, sizeof(header));
}
/*
* Fix the length (network byte ordering), and set our version &
* slot id
*/
header.length = g_ntohs(header.length);
version = (header.flags & 0xc0) >> 6;
slotId = (header.flags & 0x38) >> 3;
if (check_col(pinfo->cinfo, COL_INFO)) {
if ((header.flags & LWAPP_FLAGS_T) != 0)
col_append_str(pinfo->cinfo, COL_INFO,
" Control Packet");
else
col_append_str(pinfo->cinfo, COL_INFO,
" 802.11 Packet");
}
/* In the interest of speed, if "tree" is NULL, don't do any work not
necessary to generate protocol tree items. */
if (tree) {
/* create display subtree for the protocol */
ti = proto_tree_add_item(tree, proto_lwapp, tvb, offset,
tvb_length(tvb), FALSE);
lwapp_tree = proto_item_add_subtree(ti, ett_lwapp);
if (have_destmac) {
proto_tree_add_ether(lwapp_tree, hf_lwapp_control_mac, tvb, offset,
6, dest_mac);
offset += 6;
}
proto_tree_add_uint(lwapp_tree, hf_lwapp_version,
tvb, offset, 1, version);
proto_tree_add_uint(lwapp_tree, hf_lwapp_slotid,
tvb, offset, 1, slotId);
flags_tree = proto_item_add_subtree(lwapp_tree, ett_lwapp_flags);
proto_tree_add_boolean(flags_tree, hf_lwapp_flags_type,
tvb, offset, 1, header.flags);
proto_tree_add_boolean(flags_tree, hf_lwapp_flags_fragment,
tvb, offset, 1, header.flags);
proto_tree_add_boolean(flags_tree, hf_lwapp_flags_fragment_type,
tvb, offset, 1, header.flags);
offset++;
proto_tree_add_uint(lwapp_tree, hf_lwapp_fragment_id,
tvb, offset, 1, header.fragmentId);
offset++;
proto_tree_add_uint(lwapp_tree, hf_lwapp_length,
tvb, offset, 2, header.length);
offset += 2;
proto_tree_add_uint(lwapp_tree, hf_lwapp_rssi,
tvb, offset, 1, header.rssi);
offset++;
proto_tree_add_uint(lwapp_tree, hf_lwapp_snr,
tvb, offset, 1, header.snr);
offset++;
} /* tree */
next_client = tvb_new_subset(tvb, (have_destmac?6:0) + sizeof(LWAPP_Header), -1, -1);
if ((header.flags & LWAPP_FLAGS_T) == 0) {
call_dissector(swap_frame_control ? wlan_bsfc_handle : wlan_handle,
next_client, pinfo, tree);
} else {
dissect_control(next_client, pinfo, tree);
}
return;
} /* dissect_lwapp*/
/* registration with the filtering engine */
void
proto_register_lwapp(void)
{
static hf_register_info hf[] = {
{ &hf_lwapp_version,
{ "Version", "lwapp.version", FT_UINT8, BASE_DEC, NULL, 0x00,
"", HFILL }},
{ &hf_lwapp_slotid,
{ "slotId","lwapp.slotId", FT_UINT24, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_lwapp_flags_type,
{ "Type", "lwapp.flags.type", FT_BOOLEAN, 8,
TFS(&lwapp_flags_type), LWAPP_FLAGS_T, "", HFILL }},
{ &hf_lwapp_flags_fragment,
{ "Fragment", "lwapp.flags.fragment", FT_BOOLEAN, 8,
TFS(&lwapp_set_truth), LWAPP_FLAGS_F,
"", HFILL }},
{ &hf_lwapp_flags_fragment_type,
{ "Fragment Type", "lwapp.flags.fragmentType", FT_BOOLEAN, 8,
TFS(&lwapp_set_truth), LWAPP_FLAGS_FT,
"", HFILL }},
{ &hf_lwapp_fragment_id,
{ "Fragment Id","lwapp.fragmentId", FT_UINT8, BASE_HEX,
NULL, 0x0, "", HFILL }},
{ &hf_lwapp_length,
{ "Length","lwapp.Length", FT_UINT16, BASE_DEC,
NULL, 0x0, "", HFILL }},
{ &hf_lwapp_rssi,
{ "RSSI","lwapp.rssi", FT_UINT8, BASE_HEX,
NULL, 0x0, "", HFILL }},
{ &hf_lwapp_snr,
{ "SNR","lwapp.snr", FT_UINT8, BASE_HEX,
NULL, 0x0, "", HFILL }},
{ &hf_lwapp_control,
{ "Control Data (not dissected yet)","lwapp.control", FT_BYTES, BASE_NONE,
NULL, 0x0, "", HFILL }},
{ &hf_lwapp_control_mac,
{ "AP Identity", "lwapp.apid", FT_ETHER, BASE_NONE, NULL, 0x0,
"Access Point Identity", HFILL }},
{ &hf_lwapp_control_type,
{ "Control Type", "lwapp.control.type", FT_UINT8, BASE_DEC, NULL, 0x00,
"", HFILL }},
{ &hf_lwapp_control_seq_no,
{ "Control Sequence Number", "lwapp.control.seqno", FT_UINT8, BASE_DEC, NULL, 0x00,
"", HFILL }},
{ &hf_lwapp_control_length,
{ "Control Length","lwapp.control.length", FT_UINT16, BASE_DEC,
NULL, 0x0, "", HFILL }},
};
static gint *ett[] = {
&ett_lwapp_l3,
&ett_lwapp,
&ett_lwapp_control,
&ett_lwapp_flags
};
module_t *lwapp_module;
proto_lwapp = proto_register_protocol ("LWAPP Encapsulated Packet",
"LWAPP", "lwapp");
proto_lwapp_l3 = proto_register_protocol ("LWAPP Layer 3 Packet",
"LWAPP-L3", "lwapp-l3");
proto_lwapp_control = proto_register_protocol ("LWAP Control Message",
"LWAPP-CNTL", "lwapp-cntl");
proto_register_field_array(proto_lwapp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
lwapp_module = prefs_register_protocol(proto_lwapp, NULL);
prefs_register_bool_preference(lwapp_module,"swap_fc","Swap Frame Control",
"Swap frame control bytes (needed for some APs",
&swap_frame_control);
} /* proto_register_diameter */
void
proto_reg_handoff_lwapp(void)
{
dissector_handle_t lwapp_l3_handle;
dissector_handle_t lwapp_handle;
/*
* Get handles for the Ethernet and wireless dissectors.
*/
eth_handle = find_dissector("eth");
wlan_handle = find_dissector("wlan");
wlan_bsfc_handle = find_dissector("wlan_bsfc");
data_handle = find_dissector("data");
/* This dissector assumes lwapp packets in an 802.3 frame */
lwapp_l3_handle = create_dissector_handle(dissect_lwapp_l3, proto_lwapp_l3);
/* This dissector assumes a lwapp packet */
lwapp_handle = create_dissector_handle(dissect_lwapp, proto_lwapp);
/*
* Ok, the following deserves some comments. We have four
* different ways lwapp can appear on the wire. Mostly, this is
* because lwapp is such a new protocol.
*
* First, lwapp can join on multiple udp ports, as encapsulated
* packets on top of UDP. In this case, there is a full raw
* ethernet frame inside of the UDP packet. This method is
* becoming obscelete, but we still wanted to dissect the
* packets.
*
* Next, lwapp can be over UDP, but packged for L3 tunneling. This
* is the new-style. In this case, LWAP headers are just transmitted
* via UDP.
*
* The last method is lwapp directly over layer 2. For this, we
* dissect two different ethertypes (until IANA gives us one)
*
*/
/* Obsceleted LWAP via encapsulated 802.3 over UDP */
dissector_add("udp.port", 12220, lwapp_l3_handle);
/* new-style lwapp directly over UDP: L3-lwapp*/
dissector_add("udp.port", 12222, lwapp_handle);
dissector_add("udp.port", 12223, lwapp_handle);
/* Lwapp over L2 */
dissector_add("ethertype", 0x88bb, lwapp_handle);
dissector_add("ethertype", 0xbbbb, lwapp_handle);
}
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