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wireshark/epan/dissectors/packet-lwapp.c

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/* packet-lwapp.c
*
* Routines for LWAPP encapsulated packet disassembly
* RFC 5412
*
* Copyright (c) 2003 by David Frascone <dave@frascone.com>
*
* 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 <epan/packet.h>
#include <epan/prefs.h>
void proto_register_lwapp(void);
void proto_reg_handoff_lwapp(void);
#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 = -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_withoutfcs_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;
#if 0
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;
#endif
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,
STATISTICS_INFO_RES,
CHANGE_STATE_EVENT,
CHANGE_STATE_EVENT_RES,
RRM_CONTROL_REQ,
RRM_CONTROL_RES,
RRM_DATA_REQ,
RRM_DATA_RES,
ECHO_REQUEST,
ECHO_RESPONSE,
IMAGE_DATA,
IMAGE_DATA_RES,
RESET_REQ,
RESET_RES,
I_AM_UP_REQ,
I_AM_UP_RES,
KEY_UPDATE_REQ,
KEY_UPDATE_RES,
PRIMARY_DISCOVERY_REQ,
PRIMARY_DISCOVERY_RES,
DATA_TRANSFER,
DATA_TRANSFER_RES,
RESET_REQ_CLEAR_CONFIG
} CNTLMsgType;
static 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"},
{STATISTICS_INFO_RES , "STATISTICS_INFO_RES"},
{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"},
{IMAGE_DATA , "IMAGE_DATA"},
{IMAGE_DATA_RES , "IMAGE_DATA_RES"},
{RESET_REQ , "RESET_REQ"},
{RESET_RES , "RESET_RES"},
{I_AM_UP_REQ , "I_AM_UP_REQ"},
{I_AM_UP_RES , "I_AM_UP_RES"},
{KEY_UPDATE_REQ , "KEY_UPDATE_REQ"},
{KEY_UPDATE_RES , "KEY_UPDATE_RES"},
{PRIMARY_DISCOVERY_REQ , "PRIMARY_DISCOVERY_REQ"},
{PRIMARY_DISCOVERY_RES , "PRIMARY_DISCOVERY_RES"},
{DATA_TRANSFER , "DATA_TRANSFER"},
{DATA_TRANSFER_RES , "DATA_TRANSFER_RES"},
{RESET_REQ_CLEAR_CONFIG , "RESET_REQ_CLEAR_CONFIG"},
{ 0, NULL}
};
static value_string_ext control_msg_vals_ext = VALUE_STRING_EXT_INIT(control_msg_vals);
#if 0
static 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 value_string_ext control_tag_vals_ext = VALUE_STRING_EXT_INIT(control_tag_vals);
#endif
static const true_false_string lwapp_flags_type = {
"LWAPP Control Packet" ,
"Encapsulated 80211"
};
/*
* 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;
gint offset=0;
/* Make entries in Protocol column and Info column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "LWAPP");
col_set_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);
col_append_str(pinfo->cinfo, COL_INFO,
val_to_str_ext(header.type, &control_msg_vals_ext, "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, ENC_NA);
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_remaining(tvb, offset);
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 int
dissect_lwapp_l3(tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree, void* data _U_)
{
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *ti;
proto_tree *lwapp_tree;
gint offset = 0;
tvbuff_t *next_client;
/* Make entries in Protocol column and Info column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "LWAPP-L3");
col_set_str(pinfo->cinfo, COL_INFO, "802.3 Packets over Layer 3");
/* create display subtree for the protocol */
ti = proto_tree_add_item(tree, proto_lwapp_l3, tvb, offset,
-1, ENC_NA);
lwapp_tree = proto_item_add_subtree(ti, ett_lwapp_l3);
/* Dissect as Ethernet */
next_client = tvb_new_subset_remaining(tvb, 0);
call_dissector(eth_withoutfcs_handle, next_client, pinfo, lwapp_tree);
return tvb_captured_length(tvb);
} /* 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 int
dissect_lwapp(tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree, void* data _U_)
{
LWAPP_Header header;
guint8 slotId;
guint8 version;
proto_tree *lwapp_tree;
tvbuff_t *next_client;
guint8 dest_mac[6];
guint8 have_destmac=0;
static const int * flags[] = {
&hf_lwapp_flags_type,
&hf_lwapp_flags_fragment,
&hf_lwapp_flags_fragment_type,
NULL
};
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *ti;
gint offset=0;
/* Make entries in Protocol column and Info column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "LWAPP");
col_set_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, 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 ((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, -1, ENC_NA);
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);
proto_tree_add_bitmask(lwapp_tree, tvb, offset, hf_lwapp_flags, ett_lwapp_flags, flags, ENC_NA);
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_remaining(tvb, (have_destmac?6:0) + (int)sizeof(LWAPP_Header));
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 tvb_captured_length(tvb);
} /* 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,
NULL, HFILL }},
{ &hf_lwapp_slotid,
{ "slotId","lwapp.slotId", FT_UINT24, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_lwapp_flags,
{ "Flags", "lwapp.flags", FT_UINT8, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
{ &hf_lwapp_flags_type,
{ "Type", "lwapp.flags.type", FT_BOOLEAN, 8,
TFS(&lwapp_flags_type), LWAPP_FLAGS_T, NULL, HFILL }},
{ &hf_lwapp_flags_fragment,
{ "Fragment", "lwapp.flags.fragment", FT_BOOLEAN, 8,
TFS(&tfs_set_notset), LWAPP_FLAGS_F,
NULL, HFILL }},
{ &hf_lwapp_flags_fragment_type,
{ "Fragment Type", "lwapp.flags.fragmentType", FT_BOOLEAN, 8,
TFS(&tfs_set_notset), LWAPP_FLAGS_FT,
NULL, HFILL }},
{ &hf_lwapp_fragment_id,
{ "Fragment Id","lwapp.fragmentId", FT_UINT8, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
{ &hf_lwapp_length,
{ "Length","lwapp.Length", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_lwapp_rssi,
{ "RSSI","lwapp.rssi", FT_UINT8, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
{ &hf_lwapp_snr,
{ "SNR","lwapp.snr", FT_UINT8, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
#if 0
{ &hf_lwapp_control,
{ "Control Data (not dissected yet)","lwapp.control", FT_BYTES, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
#endif
{ &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|BASE_EXT_STRING, &control_msg_vals_ext, 0x00,
NULL, HFILL }},
{ &hf_lwapp_control_seq_no,
{ "Control Sequence Number", "lwapp.control.seqno", FT_UINT8, BASE_DEC, NULL, 0x00,
NULL, HFILL }},
{ &hf_lwapp_control_length,
{ "Control Length","lwapp.control.length", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, 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 ("LWAPP 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);
}
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_withoutfcs_handle = find_dissector("eth_withoutfcs");
wlan_handle = find_dissector("wlan_withoutfcs");
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 packaged 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)
*
*/
/* Obsoleted LWAPP via encapsulated 802.3 over UDP */
dissector_add_uint("udp.port", 12220, lwapp_l3_handle);
/* new-style lwapp directly over UDP: L3-lwapp*/
dissector_add_uint("udp.port", 12222, lwapp_handle);
dissector_add_uint("udp.port", 12223, lwapp_handle);
/* Lwapp over L2 */
dissector_add_uint("ethertype", 0x88bb, lwapp_handle);
dissector_add_uint("ethertype", 0xbbbb, lwapp_handle);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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