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/*
* packet-wlancap.c
* Decode packets with a AVS-WLAN header
*
* AVS linux-wlan-based products use a new sniff header to replace the
* old prism2-specific one dissected in packet-prism2.c. This one has
* additional fields, is designed to be non-hardware-specific, and more
* importantly, version and length fields so it can be extended later
* without breaking anything.
*
* See
*
* https://mail.shaftnet.org/chora/browse.php?rt=wlanng&f=trunk%2Fdoc%2Fcapturefrm.txt
*
* By Solomon Peachy
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* Copied from README.developer
*
* 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 <glib.h>
#include <string.h>
#include <epan/packet.h>
#include "packet-ieee80211.h"
#include "packet-wlancap.h"
#define SHORT_STR 256
/* protocol */
static int proto_wlancap = -1;
/* header attached during wlan monitor mode */
struct wlan_header_v1 {
guint32 version;
guint32 length;
guint64 mactime;
guint64 hosttime;
guint32 phytype;
guint32 channel;
guint32 datarate;
guint32 antenna;
guint32 priority;
guint32 ssi_type;
gint32 ssi_signal;
gint32 ssi_noise;
gint32 preamble;
gint32 encoding;
};
/* V2 of the header */
struct wlan_header_v2 {
struct wlan_header_v1 v1_hdr;
guint32 sequence;
guint32 drops;
guint8 sniffer_addr[6];
guint8 pad[2];
};
static int hf_wlan_magic = -1;
static int hf_wlan_version = -1;
static int hf_wlan_length = -1;
static int hf_wlan_mactime = -1;
static int hf_wlan_hosttime = -1;
static int hf_wlan_phytype = -1;
static int hf_wlan_channel = -1;
static int hf_wlan_datarate = -1;
static int hf_wlan_antenna = -1;
static int hf_wlan_priority = -1;
static int hf_wlan_ssi_type = -1;
static int hf_wlan_ssi_signal = -1;
static int hf_wlan_ssi_noise = -1;
static int hf_wlan_preamble = -1;
static int hf_wlan_encoding = -1;
static int hf_wlan_sequence = -1;
static int hf_wlan_drops = -1;
static int hf_wlan_sniffer_addr = -1;
static int hf_wlan_padding = -1;
static gint ett_wlan = -1;
static dissector_handle_t ieee80211_handle;
static void
dissect_wlancap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
void
capture_wlancap(const guchar *pd, int offset, int len, packet_counts *ld)
{
/* XXX eventually add in a version test. */
if(!BYTES_ARE_IN_FRAME(offset, len, (int)sizeof(struct wlan_header_v1))) {
ld->other ++;
return;
}
offset += sizeof(struct wlan_header_v1);
/* 802.11 header follows */
capture_ieee80211(pd, offset, len, ld);
}
void
proto_register_wlancap(void)
{
static const value_string phy_type[] = {
{ 0, "Unknown" },
{ 1, "FHSS 802.11 '97" },
{ 2, "DSSS 802.11 '97" },
{ 3, "IR Baseband" },
{ 4, "DSSS 802.11b" },
{ 5, "PBCC 802.11b" },
{ 6, "OFDM 802.11g" },
{ 7, "PBCC 802.11g" },
{ 8, "OFDM 802.11a" },
{ 0, NULL },
};
static const value_string encoding_type[] = {
{ 0, "Unknown" },
{ 1, "CCK" },
{ 2, "PBCC" },
{ 3, "OFDM" },
{ 4, "DSS-OFDM" },
{ 5, "BPSK" },
{ 6, "QPSK" },
{ 7, "16QAM" },
{ 8, "64QAM" },
{ 0, NULL },
};
static const value_string ssi_type[] = {
{ 0, "None" },
{ 1, "Normalized RSSI" },
{ 2, "dBm" },
{ 3, "Raw RSSI" },
{ 0, NULL },
};
static const value_string preamble_type[] = {
{ 0, "Unknown" },
{ 1, "Short" },
{ 2, "Long" },
{ 0, NULL },
};
static hf_register_info hf[] = {
{ &hf_wlan_magic, { "Header magic", "wlancap.magic", FT_UINT32,
BASE_HEX, NULL, 0xFFFFFFF0, "", HFILL } },
{ &hf_wlan_version, { "Header revision", "wlancap.version", FT_UINT32,
BASE_DEC, NULL, 0xF, "", HFILL } },
{ &hf_wlan_length, { "Header length", "wlancap.length", FT_UINT32,
BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_wlan_mactime, { "MAC timestamp", "wlancap.mactime", FT_UINT64,
BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_wlan_hosttime, { "Host timestamp", "wlancap.hosttime", FT_UINT64,
BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_wlan_phytype, { "PHY type", "wlancap.phytype", FT_UINT32, BASE_DEC,
VALS(phy_type), 0x0, "", HFILL } },
{ &hf_wlan_channel, { "Channel", "wlancap.channel", FT_UINT32, BASE_DEC,
NULL, 0x0, "", HFILL } },
{ &hf_wlan_datarate, { "Data rate", "wlancap.datarate", FT_UINT32,
BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_wlan_antenna, { "Antenna", "wlancap.antenna", FT_UINT32, BASE_DEC,
NULL, 0x0, "", HFILL } },
{ &hf_wlan_priority, { "Priority", "wlancap.priority", FT_UINT32, BASE_DEC,
NULL, 0x0, "", HFILL } },
{ &hf_wlan_ssi_type, { "SSI Type", "wlancap.ssi_type", FT_UINT32, BASE_DEC,
VALS(ssi_type), 0x0, "", HFILL } },
{ &hf_wlan_ssi_signal, { "SSI Signal", "wlancap.ssi_signal", FT_INT32,
BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_wlan_ssi_noise, { "SSI Noise", "wlancap.ssi_noise", FT_INT32,
BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_wlan_preamble, { "Preamble", "wlancap.preamble", FT_UINT32,
BASE_DEC, VALS(preamble_type), 0x0, "", HFILL } },
{ &hf_wlan_encoding, { "Encoding Type", "wlancap.encoding", FT_UINT32,
BASE_DEC, VALS(encoding_type), 0x0, "", HFILL } },
{ &hf_wlan_sequence, { "Receive sequence", "wlancap.sequence", FT_UINT32,
BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_wlan_drops, { "Known Dropped Frames", "wlancap.drops", FT_UINT32,
BASE_DEC, NULL, 0x0, "", HFILL } },
{ &hf_wlan_sniffer_addr, { "Sniffer Address", "wlancap.sniffer_addr", FT_ETHER,
BASE_NONE, NULL, 0x0, "Sniffer Hardware Address", HFILL } },
{ &hf_wlan_padding, { "Padding", "wlancap.padding", FT_BYTES,
BASE_NONE, NULL, 0x0, "", HFILL } },
};
static gint *ett[] = {
&ett_wlan
};
proto_wlancap = proto_register_protocol("AVS WLAN Capture header", "AVS WLANCAP", "wlancap");
proto_register_field_array(proto_wlancap, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("wlancap", dissect_wlancap, proto_wlancap);
}
static void
dissect_wlancap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *wlan_tree;
proto_item *ti;
tvbuff_t *next_tvb;
int offset;
guint32 version;
guint32 length;
guint32 datarate;
if(check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "WLAN");
if(check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
offset = 0;
version = tvb_get_ntohl(tvb, offset) - WLANCAP_MAGIC_COOKIE_BASE;
length = tvb_get_ntohl(tvb, offset+4);
if(check_col(pinfo->cinfo, COL_INFO))
col_add_fstr(pinfo->cinfo, COL_INFO, "AVS WLAN Capture v%x, Length %d",version, length);
if (check_col(pinfo->cinfo, COL_FREQ_CHAN)) {
col_add_fstr(pinfo->cinfo, COL_FREQ_CHAN, "%u",
tvb_get_ntohl(tvb, offset + 28));
}
if (check_col(pinfo->cinfo, COL_TX_RATE)) {
guint32 txrate = tvb_get_ntohl(tvb, offset + 32);
col_add_fstr(pinfo->cinfo, COL_TX_RATE, "%u.%u",
txrate / 10, txrate % 10);
}
if (check_col(pinfo->cinfo, COL_RSSI)) {
/* XXX cook ssi_signal (Based on type; ie format) */
col_add_fstr(pinfo->cinfo, COL_RSSI, "%u",
tvb_get_ntohl(tvb, offset + 48));
}
/* Dissect the packet */
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_wlancap,
tvb, 0, length, "AVS WLAN Monitoring Header");
wlan_tree = proto_item_add_subtree(ti, ett_wlan);
proto_tree_add_item(wlan_tree, hf_wlan_magic, tvb, offset, 4, FALSE);
proto_tree_add_item(wlan_tree, hf_wlan_version, tvb, offset, 4, FALSE);
offset+=4;
proto_tree_add_item(wlan_tree, hf_wlan_length, tvb, offset, 4, FALSE);
offset+=4;
proto_tree_add_item(wlan_tree, hf_wlan_mactime, tvb, offset, 8, FALSE);
offset+=8;
proto_tree_add_item(wlan_tree, hf_wlan_hosttime, tvb, offset, 8, FALSE);
offset+=8;
proto_tree_add_item(wlan_tree, hf_wlan_phytype, tvb, offset, 4, FALSE);
offset+=4;
/* XXX cook channel (fh uses different numbers) */
proto_tree_add_item(wlan_tree, hf_wlan_channel, tvb, offset, 4, FALSE);
offset+=4;
/* XXX - all other 802.11 pseudo-headers use 500Kb/s, not 100Kb/s,
as the units. */
datarate = tvb_get_ntohl(tvb, offset);
proto_tree_add_uint_format(wlan_tree, hf_wlan_datarate, tvb, offset,
4, datarate * 100,
"Data Rate: %u Kb/s", datarate * 100);
offset+=4;
proto_tree_add_item(wlan_tree, hf_wlan_antenna, tvb, offset, 4, FALSE);
offset+=4;
proto_tree_add_item(wlan_tree, hf_wlan_priority, tvb, offset, 4, FALSE);
offset+=4;
proto_tree_add_item(wlan_tree, hf_wlan_ssi_type, tvb, offset, 4, FALSE);
offset+=4;
/* XXX cook ssi_signal (Based on type; ie format) */
proto_tree_add_item(wlan_tree, hf_wlan_ssi_signal, tvb, offset, 4, FALSE);
offset+=4;
/* XXX cook ssi_noise (Based on type; ie format) */
proto_tree_add_item(wlan_tree, hf_wlan_ssi_noise, tvb, offset, 4, FALSE);
offset+=4;
proto_tree_add_item(wlan_tree, hf_wlan_preamble, tvb, offset, 4, FALSE);
offset+=4;
proto_tree_add_item(wlan_tree, hf_wlan_encoding, tvb, offset, 4, FALSE);
offset+=4;
if (version > 1) {
proto_tree_add_item(wlan_tree, hf_wlan_sequence, tvb, offset,
4, FALSE);
offset+=4;
proto_tree_add_item(wlan_tree, hf_wlan_drops, tvb, offset,
4, FALSE);
offset+=4;
proto_tree_add_item(wlan_tree, hf_wlan_sniffer_addr, tvb, offset,
6, FALSE);
offset+=6;
proto_tree_add_item(wlan_tree, hf_wlan_padding, tvb, offset,
2, FALSE);
offset+=2;
}
}
offset = length;
/* dissect the 802.11 header next */
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
call_dissector(ieee80211_handle, next_tvb, pinfo, tree);
}
void
proto_reg_handoff_wlancap(void)
{
dissector_handle_t wlancap_handle;
/* handle for 802.11 dissector */
ieee80211_handle = find_dissector("wlan");
wlancap_handle = create_dissector_handle(dissect_wlancap, proto_wlancap);
dissector_add("wtap_encap", WTAP_ENCAP_IEEE_802_11_WLAN_AVS, wlancap_handle);
}
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