forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
in promiscuous mode, packets captured promiscuously show up as 802.11 packets encapsulated in Ethernet, with an Ethernet type of 0x2452. svn path=/trunk/; revision=11451
3451 lines
111 KiB
C
3451 lines
111 KiB
C
/* packet-ieee80211.c
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* Routines for Wireless LAN (IEEE 802.11) dissection
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* Copyright 2000, Axis Communications AB
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* Inquiries/bugreports should be sent to Johan.Jorgensen@axis.com
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* Copied from README.developer
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Credits:
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*
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* The following people helped me by pointing out bugs etc. Thank you!
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*
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* Marco Molteni
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* Lena-Marie Nilsson
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* Magnus Hultman-Persson
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*/
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/*
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* 09/12/2003 - Added dissection of country information tag
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*
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* Ritchie<at>tipsybottle.com
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*
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* 03/22/2004 - Added dissection of RSN IE
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* Jouni Malinen <jkmaline@cc.hut.fi>
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef NEED_SNPRINTF_H
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# include "snprintf.h"
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#endif
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#include <string.h>
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#include <glib.h>
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#include <epan/bitswap.h>
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#include <epan/proto.h>
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#include <epan/packet.h>
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#include <epan/resolv.h>
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#include <epan/strutil.h>
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#include "prefs.h"
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#include "reassemble.h"
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#include "packet-ipx.h"
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#include "packet-llc.h"
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#include "packet-ieee80211.h"
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#include "etypes.h"
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#include "crc32.h"
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/* Defragment fragmented 802.11 datagrams */
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static gboolean wlan_defragment = TRUE;
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/* Check for the presence of the 802.11 FCS */
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static gboolean wlan_check_fcs = FALSE;
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/* Ignore the WEP bit; assume packet is decrypted */
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static gboolean wlan_ignore_wep = FALSE;
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/* Tables for reassembly of fragments. */
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static GHashTable *wlan_fragment_table = NULL;
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static GHashTable *wlan_reassembled_table = NULL;
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/* Stuff for the WEP decoder */
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static guint num_wepkeys = 0;
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static guint8 **wep_keys = NULL;
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static int *wep_keylens = NULL;
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static void init_wepkeys(void);
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static int wep_decrypt(guint8 *buf, guint32 len, int key_override);
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static tvbuff_t *try_decrypt_wep(tvbuff_t *tvb, guint32 offset, guint32 len);
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#define SSWAP(a,b) {guint8 tmp = s[a]; s[a] = s[b]; s[b] = tmp;}
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/* #define USE_ENV */
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/* When this is set, an unlimited number of WEP keys can be set in the
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environment:
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ETHEREAL_WEPKEYNUM=##
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ETHEREAL_WEPKEY1=aa:bb:cc:dd:...
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ETHEREAL_WEPKEY2=aa:bab:cc:dd:ee:...
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... you get the idea.
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otherwise you're limited to specifying four keys in the preference system.
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*/
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#ifndef USE_ENV
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static char *wep_keystr[] = {NULL, NULL, NULL, NULL};
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#endif
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/* ************************************************************************* */
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/* Miscellaneous Constants */
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/* ************************************************************************* */
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#define SHORT_STR 256
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/* ************************************************************************* */
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/* Define some very useful macros that are used to analyze frame types etc. */
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/* ************************************************************************* */
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#define COMPOSE_FRAME_TYPE(x) (((x & 0x0C)<< 2)+((x & 0xF0) >> 4)) /* Create key to (sub)type */
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#define COOK_PROT_VERSION(x) ((x) & 0x3)
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#define COOK_FRAME_TYPE(x) (((x) & 0xC) >> 2)
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#define COOK_FRAME_SUBTYPE(x) (((x) & 0xF0) >> 4)
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#define COOK_ADDR_SELECTOR(x) ((x) & 0x300)
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#define COOK_ASSOC_ID(x) ((x) & 0x3FFF)
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#define COOK_FRAGMENT_NUMBER(x) ((x) & 0x000F)
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#define COOK_SEQUENCE_NUMBER(x) (((x) & 0xFFF0) >> 4)
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#define COOK_QOS_PRIORITY(x) ((x) & 0x0007)
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#define COOK_QOS_ACK_POLICY(x) (((x) & 0x0060) >> 5)
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#define COOK_FLAGS(x) (((x) & 0xFF00) >> 8)
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#define COOK_DS_STATUS(x) ((x) & 0x3)
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#define COOK_WEP_KEY(x) (((x) & 0xC0) >> 6)
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#define KEY_EXTIV 0x20
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#define EXTIV_LEN 8
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#define FLAG_TO_DS 0x01
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#define FLAG_FROM_DS 0x02
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#define FLAG_MORE_FRAGMENTS 0x04
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#define FLAG_RETRY 0x08
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#define FLAG_POWER_MGT 0x10
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#define FLAG_MORE_DATA 0x20
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#define FLAG_WEP 0x40
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#define FLAG_ORDER 0x80
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#define IS_TO_DS(x) ((x) & FLAG_TO_DS)
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#define IS_FROM_DS(x) ((x) & FLAG_FROM_DS)
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#define HAVE_FRAGMENTS(x) ((x) & FLAG_MORE_FRAGMENTS)
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#define IS_RETRY(x) ((x) & FLAG_RETRY)
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#define POWER_MGT_STATUS(x) ((x) & FLAG_POWER_MGT)
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#define HAS_MORE_DATA(x) ((x) & FLAG_MORE_DATA)
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#define IS_WEP(x) (!wlan_ignore_wep && ((x) & FLAG_WEP))
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#define IS_STRICTLY_ORDERED(x) ((x) & FLAG_ORDER)
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#define MGT_RESERVED_RANGE(x) (((x>=0x06)&&(x<=0x07))||((x>=0x0D)&&(x<=0x0F)))
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#define CTRL_RESERVED_RANGE(x) ((x>=0x10)&&(x<=0x19))
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#define DATA_RESERVED_RANGE(x) ((x>=0x28)&&(x<=0x2f))
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#define SPEC_RESERVED_RANGE(x) ((x>=0x30)&&(x<=0x3f))
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/* ************************************************************************* */
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/* Constants used to identify cooked frame types */
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/* ************************************************************************* */
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#define MGT_FRAME 0x00 /* Frame type is management */
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#define CONTROL_FRAME 0x01 /* Frame type is control */
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#define DATA_FRAME 0x02 /* Frame type is Data */
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#define DATA_SHORT_HDR_LEN 24
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#define DATA_LONG_HDR_LEN 30
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#define MGT_FRAME_HDR_LEN 24 /* Length of Managment frame-headers */
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#define MGT_ASSOC_REQ 0x00 /* Management - association request */
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#define MGT_ASSOC_RESP 0x01 /* Management - association response */
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#define MGT_REASSOC_REQ 0x02 /* Management - reassociation request */
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#define MGT_REASSOC_RESP 0x03 /* Management - reassociation response */
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#define MGT_PROBE_REQ 0x04 /* Management - Probe request */
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#define MGT_PROBE_RESP 0x05 /* Management - Probe response */
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#define MGT_BEACON 0x08 /* Management - Beacon frame */
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#define MGT_ATIM 0x09 /* Management - ATIM */
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#define MGT_DISASS 0x0A /* Management - Disassociation */
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#define MGT_AUTHENTICATION 0x0B /* Management - Authentication */
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#define MGT_DEAUTHENTICATION 0x0C /* Management - Deauthentication */
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#define MGT_ACTION 0x0D /* Management - Action */
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#define CTRL_PS_POLL 0x1A /* Control - power-save poll */
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#define CTRL_RTS 0x1B /* Control - request to send */
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#define CTRL_CTS 0x1C /* Control - clear to send */
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#define CTRL_ACKNOWLEDGEMENT 0x1D /* Control - acknowledgement */
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#define CTRL_CFP_END 0x1E /* Control - contention-free period end */
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#define CTRL_CFP_ENDACK 0x1F /* Control - contention-free period end/ack */
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#define DATA 0x20 /* Data - Data */
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#define DATA_CF_ACK 0x21 /* Data - Data + CF acknowledge */
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#define DATA_CF_POLL 0x22 /* Data - Data + CF poll */
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#define DATA_CF_ACK_POLL 0x23 /* Data - Data + CF acknowledge + CF poll */
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#define DATA_NULL_FUNCTION 0x24 /* Data - Null function (no data) */
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#define DATA_CF_ACK_NOD 0x25 /* Data - CF ack (no data) */
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#define DATA_CF_POLL_NOD 0x26 /* Data - Data + CF poll (No data) */
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#define DATA_CF_ACK_POLL_NOD 0x27 /* Data - CF ack + CF poll (no data) */
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#define DATA_QOS_DATA 0x28 /* Data - QoS Data */
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#define DATA_QOS_NULL 0x2c /* Data - QoS Null */
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#define DATA_ADDR_T1 0
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#define DATA_ADDR_T2 (FLAG_FROM_DS << 8)
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#define DATA_ADDR_T3 (FLAG_TO_DS << 8)
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#define DATA_ADDR_T4 ((FLAG_TO_DS|FLAG_FROM_DS) << 8)
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/* ************************************************************************* */
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/* Macros used to extract information about fixed fields */
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/* ************************************************************************* */
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#define ESS_SET(x) ((x) & 0x0001)
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#define IBSS_SET(x) ((x) & 0x0002)
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/* ************************************************************************* */
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/* Logical field codes (dissector's encoding of fixed fields) */
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/* ************************************************************************* */
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#define FIELD_TIMESTAMP 0x01 /* 64-bit timestamp */
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#define FIELD_BEACON_INTERVAL 0x02 /* 16-bit beacon interval */
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#define FIELD_CAP_INFO 0x03 /* Add capability information tree */
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#define FIELD_AUTH_ALG 0x04 /* Authentication algorithm used */
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#define FIELD_AUTH_TRANS_SEQ 0x05 /* Authentication sequence number */
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#define FIELD_CURRENT_AP_ADDR 0x06
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#define FIELD_LISTEN_IVAL 0x07
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#define FIELD_REASON_CODE 0x08
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#define FIELD_ASSOC_ID 0x09
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#define FIELD_STATUS_CODE 0x0A
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#define FIELD_CATEGORY_CODE 0x0B /* Management action category */
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#define FIELD_ACTION_CODE 0x0C /* Management action code */
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#define FIELD_DIALOG_TOKEN 0x0D /* Management action dialog token */
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#define FIELD_WME_ACTION_CODE 0x0E /* Management notification action code */
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#define FIELD_WME_DIALOG_TOKEN 0x0F /* Management notification dialog token */
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#define FIELD_WME_STATUS_CODE 0x10 /* Management notification setup response status code */
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/* ************************************************************************* */
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/* Logical field codes (IEEE 802.11 encoding of tags) */
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/* ************************************************************************* */
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#define TAG_SSID 0x00
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#define TAG_SUPP_RATES 0x01
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#define TAG_FH_PARAMETER 0x02
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#define TAG_DS_PARAMETER 0x03
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#define TAG_CF_PARAMETER 0x04
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#define TAG_TIM 0x05
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#define TAG_IBSS_PARAMETER 0x06
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#define TAG_COUNTRY_INFO 0x07
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#define TAG_FH_HOPPING_PARAMETER 0x08
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#define TAG_FH_HOPPING_TABLE 0x09
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#define TAG_CHALLENGE_TEXT 0x10
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#define TAG_ERP_INFO 0x2A
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#define TAG_ERP_INFO_OLD 0x2F /* IEEE Std 802.11g/D4.0 */
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#define TAG_RSN_IE 0x30
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#define TAG_EXT_SUPP_RATES 0x32
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#define TAG_VENDOR_SPECIFIC_IE 0xDD
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#define WPA_OUI "\x00\x50\xF2"
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#define RSN_OUI "\x00\x0F\xAC"
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#define WME_OUI "\x00\x50\xF2"
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#define PMKID_LEN 16
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/* ************************************************************************* */
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/* Frame types, and their names */
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/* ************************************************************************* */
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static const value_string frame_type_subtype_vals[] = {
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{MGT_ASSOC_REQ, "Association Request"},
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{MGT_ASSOC_RESP, "Association Response"},
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{MGT_REASSOC_REQ, "Reassociation Request"},
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{MGT_REASSOC_RESP, "Reassociation Response"},
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{MGT_PROBE_REQ, "Probe Request"},
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{MGT_PROBE_RESP, "Probe Response"},
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{MGT_BEACON, "Beacon frame"},
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{MGT_ATIM, "ATIM"},
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{MGT_DISASS, "Dissassociate"},
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{MGT_AUTHENTICATION, "Authentication"},
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{MGT_DEAUTHENTICATION, "Deauthentication"},
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{MGT_ACTION, "Action"},
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{CTRL_PS_POLL, "Power-Save poll"},
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{CTRL_RTS, "Request-to-send"},
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{CTRL_CTS, "Clear-to-send"},
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{CTRL_ACKNOWLEDGEMENT, "Acknowledgement"},
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{CTRL_CFP_END, "CF-End (Control-frame)"},
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{CTRL_CFP_ENDACK, "CF-End + CF-Ack (Control-frame)"},
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{DATA, "Data"},
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{DATA_CF_ACK, "Data + CF-Acknowledgement"},
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{DATA_CF_POLL, "Data + CF-Poll"},
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{DATA_CF_ACK_POLL, "Data + CF-Acknowledgement/Poll"},
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{DATA_NULL_FUNCTION, "Null function (No data)"},
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{DATA_CF_ACK_NOD, "Data + Acknowledgement (No data)"},
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{DATA_CF_POLL_NOD, "Data + CF-Poll (No data)"},
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{DATA_CF_ACK_POLL_NOD, "Data + CF-Acknowledgement/Poll (No data)"},
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{DATA_QOS_DATA, "QoS Data"},
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{DATA_QOS_NULL, "QoS Null (No data)"},
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{0, NULL}
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};
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/* ************************************************************************* */
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/* 802.1D Tag Names */
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/* ************************************************************************* */
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static const char *qos_tags[8] = {
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"Best Effort",
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"Background",
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"Spare",
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"Excellent Effort",
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"Controlled Load",
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"Video",
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"Voice",
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"Network Control"
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};
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/* ************************************************************************* */
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/* WME Access Category Names (by 802.1D Tag) */
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/* ************************************************************************* */
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static const char *qos_acs[8] = {
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"Best Effort",
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"Background",
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"Background",
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"Video",
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"Video",
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"Video",
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"Voice",
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"Voice"
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};
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/* ************************************************************************* */
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/* WME Access Category Names (by WME ACI) */
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/* ************************************************************************* */
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static const char *wme_acs[4] = {
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"Best Effort",
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"Background",
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"Video",
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"Voice",
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};
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static int proto_wlan = -1;
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/* ************************************************************************* */
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/* Header field info values for radio information */
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/* ************************************************************************* */
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static int hf_data_rate = -1;
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static int hf_channel = -1;
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static int hf_signal_strength = -1;
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/* ************************************************************************* */
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/* Header field info values for FC-field */
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/* ************************************************************************* */
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static int hf_fc_field = -1;
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static int hf_fc_proto_version = -1;
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static int hf_fc_frame_type = -1;
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static int hf_fc_frame_subtype = -1;
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static int hf_fc_frame_type_subtype = -1;
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static int hf_fc_flags = -1;
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static int hf_fc_to_ds = -1;
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static int hf_fc_from_ds = -1;
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static int hf_fc_data_ds = -1;
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static int hf_fc_more_frag = -1;
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static int hf_fc_retry = -1;
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static int hf_fc_pwr_mgt = -1;
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static int hf_fc_more_data = -1;
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static int hf_fc_wep = -1;
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static int hf_fc_order = -1;
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/* ************************************************************************* */
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/* Header values for Duration/ID field */
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/* ************************************************************************* */
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static int hf_did_duration = -1;
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static int hf_assoc_id = -1;
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/* ************************************************************************* */
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/* Header values for different address-fields (all 4 of them) */
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/* ************************************************************************* */
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static int hf_addr_da = -1; /* Destination address subfield */
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static int hf_addr_sa = -1; /* Source address subfield */
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static int hf_addr_ra = -1; /* Receiver address subfield */
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static int hf_addr_ta = -1; /* Transmitter address subfield */
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static int hf_addr_bssid = -1; /* address is bssid */
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static int hf_addr = -1; /* Source or destination address subfield */
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/* ************************************************************************* */
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/* Header values for QoS control field */
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/* ************************************************************************* */
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static int hf_qos_priority = -1;
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static int hf_qos_ack_policy = -1;
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/* ************************************************************************* */
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/* Header values for sequence number field */
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/* ************************************************************************* */
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static int hf_frag_number = -1;
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static int hf_seq_number = -1;
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/* ************************************************************************* */
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/* Header values for Frame Check field */
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/* ************************************************************************* */
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static int hf_fcs = -1;
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/* ************************************************************************* */
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/* Header values for reassembly */
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/* ************************************************************************* */
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static int hf_fragments = -1;
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static int hf_fragment = -1;
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static int hf_fragment_overlap = -1;
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static int hf_fragment_overlap_conflict = -1;
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static int hf_fragment_multiple_tails = -1;
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static int hf_fragment_too_long_fragment = -1;
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static int hf_fragment_error = -1;
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static int hf_reassembled_in = -1;
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static int proto_wlan_mgt = -1;
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/* ************************************************************************* */
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/* Fixed fields found in mgt frames */
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/* ************************************************************************* */
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static int ff_auth_alg = -1; /* Authentication algorithm field */
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static int ff_auth_seq = -1; /* Authentication transaction sequence */
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static int ff_current_ap = -1; /* Current AP MAC address */
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static int ff_listen_ival = -1; /* Listen interval fixed field */
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static int ff_timestamp = -1; /* 64 bit timestamp */
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static int ff_beacon_interval = -1; /* 16 bit Beacon interval */
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static int ff_assoc_id = -1; /* 16 bit AID field */
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static int ff_reason = -1; /* 16 bit reason code */
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static int ff_status_code = -1; /* Status code */
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static int ff_category_code = -1; /* 8 bit Category code */
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static int ff_action_code = -1; /* 8 bit Action code */
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static int ff_dialog_token = -1; /* 8 bit Dialog token */
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static int ff_wme_action_code = -1; /* Management notification action code */
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static int ff_wme_status_code = -1; /* Management notification setup response status code */
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/* ************************************************************************* */
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/* Flags found in the capability field (fixed field) */
|
|
/* ************************************************************************* */
|
|
static int ff_capture = -1;
|
|
static int ff_cf_ess = -1;
|
|
static int ff_cf_ibss = -1;
|
|
static int ff_cf_sta_poll = -1; /* CF pollable status for a STA */
|
|
static int ff_cf_ap_poll = -1; /* CF pollable status for an AP */
|
|
static int ff_cf_privacy = -1;
|
|
static int ff_cf_preamble = -1;
|
|
static int ff_cf_pbcc = -1;
|
|
static int ff_cf_agility = -1;
|
|
static int ff_short_slot_time = -1;
|
|
static int ff_dsss_ofdm = -1;
|
|
|
|
/* ************************************************************************* */
|
|
/* Tagged value format fields */
|
|
/* ************************************************************************* */
|
|
static int tag_number = -1;
|
|
static int tag_length = -1;
|
|
static int tag_interpretation = -1;
|
|
|
|
|
|
|
|
static int hf_fixed_parameters = -1; /* Protocol payload for management frames */
|
|
static int hf_tagged_parameters = -1; /* Fixed payload item */
|
|
static int hf_wep_iv = -1;
|
|
static int hf_tkip_extiv = -1;
|
|
static int hf_ccmp_extiv = -1;
|
|
static int hf_wep_key = -1;
|
|
static int hf_wep_icv = -1;
|
|
|
|
|
|
static int rsn_cap = -1;
|
|
static int rsn_cap_preauth = -1;
|
|
static int rsn_cap_no_pairwise = -1;
|
|
static int rsn_cap_ptksa_replay_counter = -1;
|
|
static int rsn_cap_gtksa_replay_counter = -1;
|
|
|
|
/* ************************************************************************* */
|
|
/* Protocol trees */
|
|
/* ************************************************************************* */
|
|
static gint ett_80211 = -1;
|
|
static gint ett_proto_flags = -1;
|
|
static gint ett_cap_tree = -1;
|
|
static gint ett_fc_tree = -1;
|
|
static gint ett_fragments = -1;
|
|
static gint ett_fragment = -1;
|
|
|
|
static gint ett_80211_mgt = -1;
|
|
static gint ett_fixed_parameters = -1;
|
|
static gint ett_tagged_parameters = -1;
|
|
static gint ett_qos_parameters = -1;
|
|
static gint ett_wep_parameters = -1;
|
|
|
|
static gint ett_rsn_cap_tree = -1;
|
|
|
|
static const fragment_items frag_items = {
|
|
&ett_fragment,
|
|
&ett_fragments,
|
|
&hf_fragments,
|
|
&hf_fragment,
|
|
&hf_fragment_overlap,
|
|
&hf_fragment_overlap_conflict,
|
|
&hf_fragment_multiple_tails,
|
|
&hf_fragment_too_long_fragment,
|
|
&hf_fragment_error,
|
|
&hf_reassembled_in,
|
|
"fragments"
|
|
};
|
|
|
|
static dissector_handle_t llc_handle;
|
|
static dissector_handle_t ipx_handle;
|
|
static dissector_handle_t eth_handle;
|
|
static dissector_handle_t data_handle;
|
|
|
|
/* ************************************************************************* */
|
|
/* Return the length of the current header (in bytes) */
|
|
/* ************************************************************************* */
|
|
static int
|
|
find_header_length (guint16 fcf)
|
|
{
|
|
int len;
|
|
|
|
switch (COOK_FRAME_TYPE (fcf)) {
|
|
|
|
case MGT_FRAME:
|
|
return MGT_FRAME_HDR_LEN;
|
|
|
|
case CONTROL_FRAME:
|
|
switch (COMPOSE_FRAME_TYPE (fcf)) {
|
|
|
|
case CTRL_CTS:
|
|
case CTRL_ACKNOWLEDGEMENT:
|
|
return 10;
|
|
|
|
case CTRL_RTS:
|
|
case CTRL_PS_POLL:
|
|
case CTRL_CFP_END:
|
|
case CTRL_CFP_ENDACK:
|
|
return 16;
|
|
}
|
|
return 4; /* XXX */
|
|
|
|
case DATA_FRAME:
|
|
len = (COOK_ADDR_SELECTOR(fcf) == DATA_ADDR_T4) ? DATA_LONG_HDR_LEN :
|
|
DATA_SHORT_HDR_LEN;
|
|
switch (COMPOSE_FRAME_TYPE (fcf)) {
|
|
|
|
case DATA_QOS_DATA:
|
|
case DATA_QOS_NULL:
|
|
return len + 2;
|
|
|
|
default:
|
|
return len;
|
|
}
|
|
default:
|
|
return 4; /* XXX */
|
|
}
|
|
}
|
|
|
|
|
|
/* ************************************************************************* */
|
|
/* This is the capture function used to update packet counts */
|
|
/* ************************************************************************* */
|
|
static void
|
|
capture_ieee80211_common (const guchar * pd, int offset, int len,
|
|
packet_counts * ld, gboolean fixed_length_header)
|
|
{
|
|
guint16 fcf, hdr_length;
|
|
|
|
if (!BYTES_ARE_IN_FRAME(offset, len, 2)) {
|
|
ld->other++;
|
|
return;
|
|
}
|
|
|
|
fcf = pletohs (&pd[0]);
|
|
|
|
if (IS_WEP(COOK_FLAGS(fcf)))
|
|
{
|
|
ld->other++;
|
|
return;
|
|
}
|
|
|
|
switch (COMPOSE_FRAME_TYPE (fcf))
|
|
{
|
|
|
|
case DATA: /* We got a data frame */
|
|
case DATA_CF_ACK: /* Data with ACK */
|
|
case DATA_CF_POLL:
|
|
case DATA_CF_ACK_POLL:
|
|
case DATA_QOS_DATA:
|
|
if (fixed_length_header)
|
|
hdr_length = DATA_LONG_HDR_LEN;
|
|
else
|
|
hdr_length = find_header_length (fcf);
|
|
/* I guess some bridges take Netware Ethernet_802_3 frames,
|
|
which are 802.3 frames (with a length field rather than
|
|
a type field, but with no 802.2 header in the payload),
|
|
and just stick the payload into an 802.11 frame. I've seen
|
|
captures that show frames of that sort.
|
|
|
|
This means we have to do the same check for Netware 802.3 -
|
|
or, if you will, "Netware 802.11" - that we do in the
|
|
Ethernet dissector, i.e. checking for 0xffff as the first
|
|
four bytes of the payload and, if we find it, treating it
|
|
as an IPX frame. */
|
|
if (!BYTES_ARE_IN_FRAME(offset+hdr_length, len, 2)) {
|
|
ld->other++;
|
|
return;
|
|
}
|
|
if (pd[offset+hdr_length] == 0xff && pd[offset+hdr_length+1] == 0xff) {
|
|
capture_ipx (ld);
|
|
}
|
|
else {
|
|
capture_llc (pd, offset + hdr_length, len, ld);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
ld->other++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Handle 802.11 with a variable-length link-layer header.
|
|
*/
|
|
void
|
|
capture_ieee80211 (const guchar * pd, int offset, int len, packet_counts * ld)
|
|
{
|
|
capture_ieee80211_common (pd, offset, len, ld, FALSE);
|
|
}
|
|
|
|
/*
|
|
* Handle 802.11 with a fixed-length link-layer header (padded to the
|
|
* maximum length).
|
|
*/
|
|
void
|
|
capture_ieee80211_fixed (const guchar * pd, int offset, int len, packet_counts * ld)
|
|
{
|
|
capture_ieee80211_common (pd, offset, len, ld, TRUE);
|
|
}
|
|
|
|
|
|
/* ************************************************************************* */
|
|
/* Add the subtree used to store the fixed parameters */
|
|
/* ************************************************************************* */
|
|
static proto_tree *
|
|
get_fixed_parameter_tree (proto_tree * tree, tvbuff_t *tvb, int start, int size)
|
|
{
|
|
proto_item *fixed_fields;
|
|
fixed_fields =
|
|
proto_tree_add_uint_format (tree, hf_fixed_parameters, tvb, start,
|
|
size, size, "Fixed parameters (%d bytes)",
|
|
size);
|
|
|
|
return proto_item_add_subtree (fixed_fields, ett_fixed_parameters);
|
|
}
|
|
|
|
|
|
/* ************************************************************************* */
|
|
/* Add the subtree used to store tagged parameters */
|
|
/* ************************************************************************* */
|
|
static proto_tree *
|
|
get_tagged_parameter_tree (proto_tree * tree, tvbuff_t *tvb, int start, int size)
|
|
{
|
|
proto_item *tagged_fields;
|
|
|
|
tagged_fields = proto_tree_add_uint_format (tree, hf_tagged_parameters,
|
|
tvb,
|
|
start,
|
|
size,
|
|
size,
|
|
"Tagged parameters (%d bytes)",
|
|
size);
|
|
|
|
return proto_item_add_subtree (tagged_fields, ett_tagged_parameters);
|
|
}
|
|
|
|
|
|
/* ************************************************************************* */
|
|
/* Dissect and add fixed mgmt fields to protocol tree */
|
|
/* ************************************************************************* */
|
|
static void
|
|
add_fixed_field (proto_tree * tree, tvbuff_t * tvb, int offset, int lfcode)
|
|
{
|
|
const guint8 *dataptr;
|
|
char out_buff[SHORT_STR];
|
|
guint16 capability;
|
|
proto_item *cap_item;
|
|
static proto_tree *cap_tree;
|
|
double temp_double;
|
|
|
|
switch (lfcode)
|
|
{
|
|
case FIELD_TIMESTAMP:
|
|
dataptr = tvb_get_ptr (tvb, offset, 8);
|
|
memset (out_buff, 0, SHORT_STR);
|
|
snprintf (out_buff, SHORT_STR, "0x%02X%02X%02X%02X%02X%02X%02X%02X",
|
|
dataptr[7],
|
|
dataptr[6],
|
|
dataptr[5],
|
|
dataptr[4],
|
|
dataptr[3],
|
|
dataptr[2],
|
|
dataptr[1],
|
|
dataptr[0]);
|
|
|
|
proto_tree_add_string (tree, ff_timestamp, tvb, offset, 8, out_buff);
|
|
break;
|
|
|
|
case FIELD_BEACON_INTERVAL:
|
|
temp_double = (double) tvb_get_letohs (tvb, offset);
|
|
temp_double = temp_double * 1024 / 1000000;
|
|
proto_tree_add_double_format (tree, ff_beacon_interval, tvb, offset, 2,
|
|
temp_double,"Beacon Interval: %f [Seconds]",
|
|
temp_double);
|
|
break;
|
|
|
|
|
|
case FIELD_CAP_INFO:
|
|
capability = tvb_get_letohs (tvb, offset);
|
|
|
|
cap_item = proto_tree_add_uint_format (tree, ff_capture,
|
|
tvb, offset, 2,
|
|
capability,
|
|
"Capability Information: 0x%04X",
|
|
capability);
|
|
cap_tree = proto_item_add_subtree (cap_item, ett_cap_tree);
|
|
proto_tree_add_boolean (cap_tree, ff_cf_ess, tvb, offset, 2,
|
|
capability);
|
|
proto_tree_add_boolean (cap_tree, ff_cf_ibss, tvb, offset, 2,
|
|
capability);
|
|
if (ESS_SET (capability) != 0) /* This is an AP */
|
|
proto_tree_add_uint (cap_tree, ff_cf_ap_poll, tvb, offset, 2,
|
|
capability);
|
|
|
|
else /* This is a STA */
|
|
proto_tree_add_uint (cap_tree, ff_cf_sta_poll, tvb, offset, 2,
|
|
capability);
|
|
proto_tree_add_boolean (cap_tree, ff_cf_privacy, tvb, offset, 2,
|
|
capability);
|
|
proto_tree_add_boolean (cap_tree, ff_cf_preamble, tvb, offset, 2,
|
|
capability);
|
|
proto_tree_add_boolean (cap_tree, ff_cf_pbcc, tvb, offset, 2,
|
|
capability);
|
|
proto_tree_add_boolean (cap_tree, ff_cf_agility, tvb, offset, 2,
|
|
capability);
|
|
proto_tree_add_boolean (cap_tree, ff_short_slot_time, tvb, offset, 2,
|
|
capability);
|
|
proto_tree_add_boolean (cap_tree, ff_dsss_ofdm, tvb, offset, 2,
|
|
capability);
|
|
break;
|
|
|
|
case FIELD_AUTH_ALG:
|
|
proto_tree_add_item (tree, ff_auth_alg, tvb, offset, 2, TRUE);
|
|
break;
|
|
|
|
case FIELD_AUTH_TRANS_SEQ:
|
|
proto_tree_add_item (tree, ff_auth_seq, tvb, offset, 2, TRUE);
|
|
break;
|
|
|
|
case FIELD_CURRENT_AP_ADDR:
|
|
proto_tree_add_item (tree, ff_current_ap, tvb, offset, 6, FALSE);
|
|
break;
|
|
|
|
case FIELD_LISTEN_IVAL:
|
|
proto_tree_add_item (tree, ff_listen_ival, tvb, offset, 2, TRUE);
|
|
break;
|
|
|
|
case FIELD_REASON_CODE:
|
|
proto_tree_add_item (tree, ff_reason, tvb, offset, 2, TRUE);
|
|
break;
|
|
|
|
case FIELD_ASSOC_ID:
|
|
proto_tree_add_uint(tree, ff_assoc_id, tvb, offset, 2,
|
|
COOK_ASSOC_ID(tvb_get_letohs(tvb,offset)));
|
|
/* proto_tree_add_item (tree, ff_assoc_id, tvb, offset, 2, TRUE); */
|
|
break;
|
|
|
|
case FIELD_STATUS_CODE:
|
|
proto_tree_add_item (tree, ff_status_code, tvb, offset, 2, TRUE);
|
|
break;
|
|
|
|
case FIELD_CATEGORY_CODE:
|
|
proto_tree_add_item (tree, ff_category_code, tvb, offset, 1, TRUE);
|
|
break;
|
|
|
|
case FIELD_ACTION_CODE:
|
|
proto_tree_add_item (tree, ff_action_code, tvb, offset, 1, TRUE);
|
|
break;
|
|
|
|
case FIELD_DIALOG_TOKEN:
|
|
proto_tree_add_item (tree, ff_dialog_token, tvb, offset, 1, TRUE);
|
|
break;
|
|
|
|
case FIELD_WME_ACTION_CODE:
|
|
proto_tree_add_item (tree, ff_wme_action_code, tvb, offset, 1, TRUE);
|
|
break;
|
|
|
|
case FIELD_WME_STATUS_CODE:
|
|
proto_tree_add_item (tree, ff_wme_status_code, tvb, offset, 1, TRUE);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static char *wpa_cipher_str[] =
|
|
{
|
|
"NONE",
|
|
"WEP (40-bit)",
|
|
"TKIP",
|
|
"AES (OCB)",
|
|
"AES (CCM)",
|
|
"WEP (104-bit)",
|
|
};
|
|
|
|
static char *
|
|
wpa_cipher_idx2str(guint idx)
|
|
{
|
|
if (idx < sizeof(wpa_cipher_str)/sizeof(wpa_cipher_str[0]))
|
|
return wpa_cipher_str[idx];
|
|
return "UNKNOWN";
|
|
}
|
|
|
|
static char *wpa_keymgmt_str[] =
|
|
{
|
|
"NONE",
|
|
"WPA",
|
|
"PSK",
|
|
};
|
|
|
|
static char *
|
|
wpa_keymgmt_idx2str(guint idx)
|
|
{
|
|
if (idx < sizeof(wpa_keymgmt_str)/sizeof(wpa_keymgmt_str[0]))
|
|
return wpa_keymgmt_str[idx];
|
|
return "UNKNOWN";
|
|
}
|
|
|
|
static void
|
|
dissect_vendor_specific_ie(proto_tree * tree, tvbuff_t * tvb, int offset,
|
|
guint32 tag_len, const guint8 *tag_val)
|
|
{
|
|
guint32 tag_val_off = 0;
|
|
char out_buff[SHORT_STR], *pos;
|
|
guint i;
|
|
|
|
/* Wi-Fi Protected Access (WPA) Information Element */
|
|
if (tag_val_off + 6 <= tag_len && !memcmp(tag_val, WPA_OUI"\x01", 4)) {
|
|
snprintf(out_buff, SHORT_STR, "WPA IE, type %u, version %u",
|
|
tag_val[tag_val_off + 3], pletohs(&tag_val[tag_val_off + 4]));
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 6, out_buff);
|
|
offset += 6;
|
|
tag_val_off += 6;
|
|
if (tag_val_off + 4 <= tag_len) {
|
|
/* multicast cipher suite */
|
|
if (!memcmp(&tag_val[tag_val_off], WPA_OUI, 3)) {
|
|
snprintf(out_buff, SHORT_STR, "Multicast cipher suite: %s",
|
|
wpa_cipher_idx2str(tag_val[tag_val_off + 3]));
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 4, out_buff);
|
|
offset += 4;
|
|
tag_val_off += 4;
|
|
/* unicast cipher suites */
|
|
if (tag_val_off + 2 <= tag_len) {
|
|
snprintf(out_buff, SHORT_STR, "# of unicast cipher suites: %u",
|
|
pletohs(tag_val + tag_val_off));
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 2, out_buff);
|
|
offset += 2;
|
|
tag_val_off += 2;
|
|
i = 1;
|
|
while (tag_val_off + 4 <= tag_len) {
|
|
if (!memcmp(&tag_val[tag_val_off], WPA_OUI, 3)) {
|
|
snprintf(out_buff, SHORT_STR, "Unicast cipher suite %u: %s",
|
|
i, wpa_cipher_idx2str(tag_val[tag_val_off + 3]));
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 4, out_buff);
|
|
offset += 4;
|
|
tag_val_off += 4;
|
|
i ++;
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
/* authenticated key management suites */
|
|
if (tag_val_off + 2 <= tag_len) {
|
|
snprintf(out_buff, SHORT_STR, "# of auth key management suites: %u",
|
|
pletohs(tag_val + tag_val_off));
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 2, out_buff);
|
|
offset += 2;
|
|
tag_val_off += 2;
|
|
i = 1;
|
|
while (tag_val_off + 4 <= tag_len) {
|
|
if (!memcmp(&tag_val[tag_val_off], WPA_OUI, 3)) {
|
|
snprintf(out_buff, SHORT_STR, "auth key management suite %u: %s",
|
|
i, wpa_keymgmt_idx2str(tag_val[tag_val_off + 3]));
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 4, out_buff);
|
|
offset += 4;
|
|
tag_val_off += 4;
|
|
i ++;
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (tag_val_off < tag_len)
|
|
proto_tree_add_string(tree, tag_interpretation, tvb,
|
|
offset, tag_len - tag_val_off, "Not interpreted");
|
|
} else if (tag_val_off + 7 <= tag_len && !memcmp(tag_val, WME_OUI"\x02\x00", 5)) {
|
|
/* Wireless Multimedia Enhancements (WME) Information Element */
|
|
snprintf(out_buff, SHORT_STR, "WME IE: type %u, subtype %u, version %u, parameter set %u",
|
|
tag_val[tag_val_off + 3], tag_val[tag_val_off + 4], tag_val[tag_val_off + 5],
|
|
tag_val[tag_val_off + 6]);
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 7, out_buff);
|
|
} else if (tag_val_off + 24 <= tag_len && !memcmp(tag_val, WME_OUI"\x02\x01", 5)) {
|
|
/* Wireless Multimedia Enhancements (WME) Parameter Element */
|
|
snprintf(out_buff, SHORT_STR, "WME PE: type %u, subtype %u, version %u, parameter set %u",
|
|
tag_val[tag_val_off + 3], tag_val[tag_val_off + 4], tag_val[tag_val_off + 5],
|
|
tag_val[tag_val_off + 6]);
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 7, out_buff);
|
|
offset += 8;
|
|
tag_val_off += 8;
|
|
for (i = 0; i < 4; i++) {
|
|
snprintf(out_buff, SHORT_STR, "WME AC Parameters: ACI %u (%s), Admission Control %sMandatory, AIFSN %u, ECWmin %u, ECWmax %u, TXOP %u",
|
|
(tag_val[tag_val_off] & 0x60) >> 5,
|
|
wme_acs[(tag_val[tag_val_off] & 0x60) >> 5],
|
|
(tag_val[tag_val_off] & 0x10) ? "" : "not ",
|
|
tag_val[tag_val_off] & 0x0f,
|
|
tag_val[tag_val_off + 1] & 0x0f,
|
|
(tag_val[tag_val_off + 1] & 0xf0) >> 4,
|
|
tvb_get_letohs(tvb, offset + 2));
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 4, out_buff);
|
|
offset += 4;
|
|
tag_val_off += 4;
|
|
}
|
|
} else if (tag_val_off + 56 <= tag_len && !memcmp(tag_val, WME_OUI"\x02\x02", 5)) {
|
|
/* Wireless Multimedia Enhancements (WME) TSPEC Element */
|
|
guint16 ts_info, msdu_size, surplus_bandwidth;
|
|
const char *direction[] = { "Uplink", "Downlink", "Reserved", "Bi-directional" };
|
|
const value_string fields[] = {
|
|
{12, "Minimum Service Interval"},
|
|
{16, "Maximum Service Interval"},
|
|
{20, "Inactivity Interval"},
|
|
{24, "Service Start Time"},
|
|
{28, "Minimum Data Rate"},
|
|
{32, "Mean Data Rate"},
|
|
{36, "Maximum Burst Size"},
|
|
{40, "Minimum PHY Rate"},
|
|
{44, "Peak Data Rate"},
|
|
{48, "Delay Bound"},
|
|
{0, NULL}
|
|
};
|
|
char *field;
|
|
|
|
snprintf(out_buff, SHORT_STR, "WME TSPEC: type %u, subtype %u, version %u",
|
|
tag_val[tag_val_off + 3], tag_val[tag_val_off + 4], tag_val[tag_val_off + 5]);
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 6, out_buff);
|
|
offset += 6;
|
|
tag_val_off += 6;
|
|
|
|
ts_info = tvb_get_letohs(tvb, offset);
|
|
snprintf(out_buff, SHORT_STR, "WME TS Info: Priority %u (%s) (%s), Contention-based access %sset, %s",
|
|
(ts_info >> 11) & 0x7, qos_tags[(ts_info >> 11) & 0x7], qos_acs[(ts_info >> 11) & 0x7],
|
|
(ts_info & 0x0080) ? "" : "not ",
|
|
direction[(ts_info >> 5) & 0x3]);
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 2, out_buff);
|
|
offset += 2;
|
|
tag_val_off += 2;
|
|
|
|
msdu_size = tvb_get_letohs(tvb, offset);
|
|
snprintf(out_buff, SHORT_STR, "WME TSPEC: %s MSDU Size %u",
|
|
(msdu_size & 0x8000) ? "Fixed" : "Nominal", msdu_size & 0x7fff);
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 2, out_buff);
|
|
offset += 2;
|
|
tag_val_off += 2;
|
|
|
|
snprintf(out_buff, SHORT_STR, "WME TSPEC: Maximum MSDU Size %u", tvb_get_letohs(tvb, offset));
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 2, out_buff);
|
|
offset += 2;
|
|
tag_val_off += 2;
|
|
|
|
while ((field = val_to_str(tag_val_off, fields, NULL))) {
|
|
snprintf(out_buff, SHORT_STR, "WME TSPEC: %s %u", field, tvb_get_letohl(tvb, offset));
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 4, out_buff);
|
|
offset += 4;
|
|
tag_val_off += 4;
|
|
if (tag_val_off == 52)
|
|
break;
|
|
}
|
|
|
|
surplus_bandwidth = tvb_get_letohs(tvb, offset);
|
|
snprintf(out_buff, SHORT_STR, "WME TSPEC: Surplus Bandwidth Allowance Factor %u.%u",
|
|
(surplus_bandwidth >> 13) & 0x7, (surplus_bandwidth & 0x1fff));
|
|
offset += 2;
|
|
tag_val_off += 2;
|
|
|
|
snprintf(out_buff, SHORT_STR, "WME TSPEC: Medium Time %u", tvb_get_letohs(tvb, offset));
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 2, out_buff);
|
|
offset += 2;
|
|
tag_val_off += 2;
|
|
} else if (tag_val_off + 4 <= tag_len && !memcmp(tag_val, RSN_OUI"\x04", 4)) {
|
|
/* IEEE 802.11i / Key Data Encapsulation / Data Type=4 - PMKID.
|
|
* This is only used within EAPOL-Key frame Key Data. */
|
|
pos = out_buff;
|
|
pos += snprintf(pos, out_buff + SHORT_STR - pos, "RSN PMKID: ");
|
|
if (tag_len - 4 != PMKID_LEN) {
|
|
pos += snprintf(pos, out_buff + SHORT_STR - pos,
|
|
"(invalid PMKID len=%d, expected 16) ", tag_len - 4);
|
|
}
|
|
for (i = 0; i < tag_len - 4; i++) {
|
|
pos += snprintf(pos, out_buff + SHORT_STR - pos, "%02X",
|
|
tag_val[tag_val_off + 4 + i]);
|
|
}
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset,
|
|
tag_len, out_buff);
|
|
} else
|
|
proto_tree_add_string(tree, tag_interpretation,
|
|
tvb, offset, tag_len, "Not interpreted");
|
|
}
|
|
|
|
static void
|
|
dissect_rsn_ie(proto_tree * tree, tvbuff_t * tvb, int offset,
|
|
guint32 tag_len, const guint8 *tag_val)
|
|
{
|
|
guint32 tag_val_off = 0;
|
|
guint16 rsn_capab;
|
|
char out_buff[SHORT_STR];
|
|
int i, j, count;
|
|
proto_item *cap_item;
|
|
proto_tree *cap_tree;
|
|
|
|
if (tag_val_off + 2 > tag_len) {
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, tag_len,
|
|
"Not interpreted");
|
|
return;
|
|
}
|
|
|
|
snprintf(out_buff, SHORT_STR, "RSN IE, version %u",
|
|
pletohs(&tag_val[tag_val_off]));
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 2, out_buff);
|
|
|
|
offset += 2;
|
|
tag_val_off += 2;
|
|
|
|
if (tag_val_off + 4 > tag_len)
|
|
goto done;
|
|
|
|
/* multicast cipher suite */
|
|
if (!memcmp(&tag_val[tag_val_off], RSN_OUI, 3)) {
|
|
snprintf(out_buff, SHORT_STR, "Multicast cipher suite: %s",
|
|
wpa_cipher_idx2str(tag_val[tag_val_off + 3]));
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 4, out_buff);
|
|
offset += 4;
|
|
tag_val_off += 4;
|
|
}
|
|
|
|
if (tag_val_off + 2 > tag_len)
|
|
goto done;
|
|
|
|
/* unicast cipher suites */
|
|
count = pletohs(tag_val + tag_val_off);
|
|
snprintf(out_buff, SHORT_STR, "# of unicast cipher suites: %u", count);
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 2, out_buff);
|
|
offset += 2;
|
|
tag_val_off += 2;
|
|
i = 1;
|
|
while (tag_val_off + 4 <= tag_len && i <= count) {
|
|
if (memcmp(&tag_val[tag_val_off], RSN_OUI, 3) != 0)
|
|
goto done;
|
|
snprintf(out_buff, SHORT_STR, "Unicast cipher suite %u: %s",
|
|
i, wpa_cipher_idx2str(tag_val[tag_val_off + 3]));
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 4, out_buff);
|
|
offset += 4;
|
|
tag_val_off += 4;
|
|
i++;
|
|
}
|
|
|
|
if (i <= count || tag_val_off + 2 > tag_len)
|
|
goto done;
|
|
|
|
/* authenticated key management suites */
|
|
count = pletohs(tag_val + tag_val_off);
|
|
snprintf(out_buff, SHORT_STR, "# of auth key management suites: %u", count);
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 2, out_buff);
|
|
offset += 2;
|
|
tag_val_off += 2;
|
|
i = 1;
|
|
while (tag_val_off + 4 <= tag_len && i <= count) {
|
|
if (memcmp(&tag_val[tag_val_off], RSN_OUI, 3) != 0)
|
|
goto done;
|
|
snprintf(out_buff, SHORT_STR, "auth key management suite %u: %s",
|
|
i, wpa_keymgmt_idx2str(tag_val[tag_val_off + 3]));
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 4, out_buff);
|
|
offset += 4;
|
|
tag_val_off += 4;
|
|
i++;
|
|
}
|
|
|
|
if (i <= count || tag_val_off + 2 > tag_len)
|
|
goto done;
|
|
|
|
rsn_capab = pletohs(&tag_val[tag_val_off]);
|
|
snprintf(out_buff, SHORT_STR, "RSN Capabilities 0x%04x", rsn_capab);
|
|
cap_item = proto_tree_add_uint_format(tree, rsn_cap, tvb,
|
|
offset, 2, rsn_capab,
|
|
"RSN Capabilities: 0x%04X", rsn_capab);
|
|
cap_tree = proto_item_add_subtree(cap_item, ett_rsn_cap_tree);
|
|
proto_tree_add_boolean(cap_tree, rsn_cap_preauth, tvb, offset, 2,
|
|
rsn_capab);
|
|
proto_tree_add_boolean(cap_tree, rsn_cap_no_pairwise, tvb, offset, 2,
|
|
rsn_capab);
|
|
proto_tree_add_uint(cap_tree, rsn_cap_ptksa_replay_counter, tvb, offset, 2,
|
|
rsn_capab);
|
|
proto_tree_add_uint(cap_tree, rsn_cap_gtksa_replay_counter, tvb, offset, 2,
|
|
rsn_capab);
|
|
offset += 2;
|
|
tag_val_off += 2;
|
|
|
|
if (tag_val_off + 2 > tag_len)
|
|
goto done;
|
|
|
|
count = pletohs(tag_val + tag_val_off);
|
|
snprintf(out_buff, SHORT_STR, "# of PMKIDs: %u", count);
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset, 2, out_buff);
|
|
offset += 2;
|
|
tag_val_off += 2;
|
|
|
|
/* PMKID List (16 * n octets) */
|
|
for (i = 0; i < count; i++) {
|
|
char *pos;
|
|
if (tag_val_off + PMKID_LEN > tag_len)
|
|
goto done;
|
|
pos = out_buff;
|
|
pos += snprintf(pos, out_buff + SHORT_STR - pos, "PMKID %u: ", i);
|
|
for (j = 0; j < PMKID_LEN; j++) {
|
|
pos += snprintf(pos, out_buff + SHORT_STR - pos, "%02X",
|
|
tag_val[tag_val_off + j]);
|
|
}
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset,
|
|
PMKID_LEN, out_buff);
|
|
offset += PMKID_LEN;
|
|
tag_val_off += PMKID_LEN;
|
|
}
|
|
|
|
done:
|
|
if (tag_val_off < tag_len)
|
|
proto_tree_add_string(tree, tag_interpretation, tvb, offset,
|
|
tag_len - tag_val_off, "Not interpreted");
|
|
}
|
|
|
|
/* ************************************************************************* */
|
|
/* Dissect and add tagged (optional) fields to proto tree */
|
|
/* ************************************************************************* */
|
|
|
|
static const value_string tag_num_vals[] = {
|
|
{ TAG_SSID, "SSID parameter set" },
|
|
{ TAG_SUPP_RATES, "Supported Rates" },
|
|
{ TAG_FH_PARAMETER, "FH Parameter set" },
|
|
{ TAG_DS_PARAMETER, "DS Parameter set" },
|
|
{ TAG_CF_PARAMETER, "CF Parameter set" },
|
|
{ TAG_TIM, "(TIM) Traffic Indication Map" },
|
|
{ TAG_IBSS_PARAMETER, "IBSS Parameter set" },
|
|
{ TAG_COUNTRY_INFO, "Country Information" },
|
|
{ TAG_FH_HOPPING_PARAMETER, "Hopping Pattern Parameters" },
|
|
{ TAG_CHALLENGE_TEXT, "Challenge text" },
|
|
{ TAG_ERP_INFO, "ERP Information" },
|
|
{ TAG_ERP_INFO_OLD, "ERP Information" },
|
|
{ TAG_RSN_IE, "RSN Information" },
|
|
{ TAG_EXT_SUPP_RATES, "Extended Supported Rates" },
|
|
{ TAG_VENDOR_SPECIFIC_IE, "Vendor Specific" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string environment_vals[] = {
|
|
{ 0x20, "Any" },
|
|
{ 0x4f, "Outdoor" },
|
|
{ 0x49, "Indoor" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static int
|
|
add_tagged_field (proto_tree * tree, tvbuff_t * tvb, int offset)
|
|
{
|
|
const guint8 *tag_data_ptr;
|
|
guint32 tag_no, tag_len;
|
|
unsigned int i;
|
|
int n, ret;
|
|
char out_buff[SHORT_STR];
|
|
|
|
|
|
tag_no = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint_format (tree, tag_number, tvb, offset, 1, tag_no,
|
|
"Tag Number: %u (%s)",
|
|
tag_no,
|
|
val_to_str(tag_no, tag_num_vals,
|
|
(tag_no >= 17 && tag_no <= 31) ?
|
|
"Reserved for challenge text" :
|
|
"Reserved tag number"));
|
|
|
|
tag_len = tvb_get_guint8(tvb, offset + 1);
|
|
proto_tree_add_uint (tree, tag_length, tvb, offset + 1, 1, tag_len);
|
|
|
|
tag_data_ptr = tvb_get_ptr (tvb, offset + 2, tag_len);
|
|
|
|
switch (tag_no)
|
|
{
|
|
|
|
|
|
case TAG_SSID:
|
|
memset (out_buff, 0, SHORT_STR);
|
|
|
|
memcpy (out_buff, tag_data_ptr, (size_t) tag_len);
|
|
out_buff[tag_len + 1] = 0;
|
|
|
|
proto_tree_add_string (tree, tag_interpretation, tvb, offset + 2,
|
|
tag_len, out_buff);
|
|
break;
|
|
|
|
|
|
|
|
case TAG_SUPP_RATES:
|
|
case TAG_EXT_SUPP_RATES:
|
|
memset (out_buff, 0, SHORT_STR);
|
|
strcpy (out_buff, "Supported rates: ");
|
|
n = strlen (out_buff);
|
|
|
|
for (i = 0; i < tag_len && n < SHORT_STR; i++)
|
|
{
|
|
ret = snprintf (out_buff + n, SHORT_STR - n, "%2.1f%s ",
|
|
(tag_data_ptr[i] & 0x7F) * 0.5,
|
|
(tag_data_ptr[i] & 0x80) ? "(B)" : "");
|
|
if (ret == -1 || ret >= SHORT_STR - n) {
|
|
/* Some versions of snprintf return -1 if they'd truncate
|
|
the output. Others return <buf_size> or greater. */
|
|
break;
|
|
}
|
|
n += ret;
|
|
}
|
|
if (n < SHORT_STR)
|
|
snprintf (out_buff + n, SHORT_STR - n, "[Mbit/sec]");
|
|
|
|
out_buff[SHORT_STR-1] = '\0';
|
|
proto_tree_add_string (tree, tag_interpretation, tvb, offset + 2,
|
|
tag_len, out_buff);
|
|
break;
|
|
|
|
|
|
|
|
case TAG_FH_PARAMETER:
|
|
memset (out_buff, 0, SHORT_STR);
|
|
|
|
snprintf (out_buff, SHORT_STR,
|
|
"Dwell time 0x%04X, Hop Set %2d, Hop Pattern %2d, "
|
|
"Hop Index %2d", pletohs (tag_data_ptr), tag_data_ptr[2],
|
|
tag_data_ptr[3], tag_data_ptr[4]);
|
|
|
|
proto_tree_add_string (tree, tag_interpretation, tvb, offset + 2,
|
|
tag_len, out_buff);
|
|
break;
|
|
|
|
|
|
|
|
case TAG_DS_PARAMETER:
|
|
memset (out_buff, 0, SHORT_STR);
|
|
|
|
snprintf (out_buff, SHORT_STR, "Current Channel: %u", tag_data_ptr[0]);
|
|
proto_tree_add_string (tree, tag_interpretation, tvb, offset + 2,
|
|
tag_len, out_buff);
|
|
break;
|
|
|
|
|
|
case TAG_CF_PARAMETER:
|
|
memset (out_buff, 0, SHORT_STR);
|
|
|
|
snprintf (out_buff, SHORT_STR,
|
|
"CFP count %u, CFP period %u, CFP max duration %u, "
|
|
"CFP Remaining %u", tag_data_ptr[0], tag_data_ptr[1],
|
|
pletohs (tag_data_ptr + 2), pletohs (tag_data_ptr + 4));
|
|
|
|
proto_tree_add_string (tree, tag_interpretation, tvb, offset + 2,
|
|
tag_len, out_buff);
|
|
break;
|
|
|
|
|
|
case TAG_TIM:
|
|
memset (out_buff, 0, SHORT_STR);
|
|
snprintf (out_buff, SHORT_STR,
|
|
"DTIM count %u, DTIM period %u, Bitmap control 0x%X, "
|
|
"(Bitmap suppressed)", tag_data_ptr[0], tag_data_ptr[1],
|
|
tag_data_ptr[2]);
|
|
proto_tree_add_string (tree, tag_interpretation, tvb, offset + 2,
|
|
tag_len, out_buff);
|
|
break;
|
|
|
|
|
|
|
|
case TAG_IBSS_PARAMETER:
|
|
memset (out_buff, 0, SHORT_STR);
|
|
snprintf (out_buff, SHORT_STR, "ATIM window 0x%X",
|
|
pletohs (tag_data_ptr));
|
|
|
|
proto_tree_add_string (tree, tag_interpretation, tvb, offset + 2,
|
|
tag_len, out_buff);
|
|
break;
|
|
|
|
|
|
case TAG_COUNTRY_INFO:
|
|
memset (out_buff, 0, SHORT_STR);
|
|
|
|
snprintf (out_buff, SHORT_STR, "Country Code: %c%c, %s Environment",
|
|
tag_data_ptr[0], tag_data_ptr[1],
|
|
val_to_str(tag_data_ptr[2], environment_vals,"Unknown (0x%02x)"));
|
|
|
|
n = strlen (out_buff);
|
|
|
|
for (i = 3; (i + 3) <= tag_len && n < SHORT_STR; i += 3)
|
|
{
|
|
ret = snprintf(out_buff + n, SHORT_STR - n,
|
|
", Start Channel: %u, Channels: %u, Max TX Power: %d dBm",
|
|
tag_data_ptr[i], tag_data_ptr[i + 1],
|
|
(gint)tag_data_ptr[i + 2]);
|
|
|
|
if (ret == -1 || ret >= SHORT_STR - n) {
|
|
/* Some versions of snprintf return -1 if they'd truncate
|
|
the output. Others return <buf_size> or greater. */
|
|
break;
|
|
}
|
|
n += ret;
|
|
}
|
|
|
|
proto_tree_add_string (tree, tag_interpretation, tvb, offset + 2,tag_len, out_buff);
|
|
break;
|
|
|
|
|
|
case TAG_FH_HOPPING_PARAMETER:
|
|
memset (out_buff, 0, SHORT_STR);
|
|
snprintf (out_buff, SHORT_STR, "Prime Radix: %u, Number of Channels: %u",
|
|
tag_data_ptr[0], tag_data_ptr[1]);
|
|
proto_tree_add_string (tree, tag_interpretation, tvb, offset + 2, tag_len, out_buff);
|
|
|
|
|
|
break;
|
|
|
|
|
|
case TAG_CHALLENGE_TEXT:
|
|
memset (out_buff, 0, SHORT_STR);
|
|
snprintf (out_buff, SHORT_STR, "Challenge text: %.47s", tag_data_ptr);
|
|
proto_tree_add_string (tree, tag_interpretation, tvb, offset + 2,
|
|
tag_len, out_buff);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case TAG_ERP_INFO:
|
|
case TAG_ERP_INFO_OLD:
|
|
memset (out_buff, 0, SHORT_STR);
|
|
|
|
snprintf (out_buff, SHORT_STR,
|
|
"ERP info: 0x%x (%sNon-ERP STAs, %suse protection, %s preambles)",
|
|
tag_data_ptr[0],
|
|
tag_data_ptr[0] & 0x01 ? "" : "no ",
|
|
tag_data_ptr[0] & 0x02 ? "" : "do not ",
|
|
tag_data_ptr[0] & 0x04 ? "short or long": "long");
|
|
proto_tree_add_string (tree, tag_interpretation, tvb, offset + 2,
|
|
tag_len, out_buff);
|
|
|
|
break;
|
|
|
|
case TAG_VENDOR_SPECIFIC_IE:
|
|
dissect_vendor_specific_ie(tree, tvb, offset + 2, tag_len,
|
|
tag_data_ptr);
|
|
break;
|
|
|
|
case TAG_RSN_IE:
|
|
dissect_rsn_ie(tree, tvb, offset + 2, tag_len, tag_data_ptr);
|
|
break;
|
|
|
|
|
|
default:
|
|
proto_tree_add_string (tree, tag_interpretation, tvb, offset + 2,
|
|
tag_len, "Not interpreted");
|
|
break;
|
|
}
|
|
|
|
return tag_len + 2;
|
|
}
|
|
|
|
void
|
|
ieee_80211_add_tagged_parameters (tvbuff_t * tvb, int offset, proto_tree * tree,
|
|
int tagged_parameters_len)
|
|
{
|
|
int next_len;
|
|
|
|
while (tagged_parameters_len > 0) {
|
|
if ((next_len=add_tagged_field (tree, tvb, offset))==0)
|
|
break;
|
|
if (next_len > tagged_parameters_len) {
|
|
/* XXX - flag this as an error? */
|
|
next_len = tagged_parameters_len;
|
|
}
|
|
offset += next_len;
|
|
tagged_parameters_len -= next_len;
|
|
}
|
|
}
|
|
|
|
/* ************************************************************************* */
|
|
/* Dissect 802.11 management frame */
|
|
/* ************************************************************************* */
|
|
static void
|
|
dissect_ieee80211_mgt (guint16 fcf, tvbuff_t * tvb, packet_info * pinfo,
|
|
proto_tree * tree)
|
|
{
|
|
proto_item *ti = NULL;
|
|
proto_tree *mgt_tree;
|
|
proto_tree *fixed_tree;
|
|
proto_tree *tagged_tree;
|
|
int offset;
|
|
int tagged_parameter_tree_len;
|
|
|
|
CHECK_DISPLAY_AS_X(data_handle,proto_wlan_mgt, tvb, pinfo, tree);
|
|
|
|
if (tree)
|
|
{
|
|
ti = proto_tree_add_item (tree, proto_wlan_mgt, tvb, 0, -1, FALSE);
|
|
mgt_tree = proto_item_add_subtree (ti, ett_80211_mgt);
|
|
|
|
switch (COMPOSE_FRAME_TYPE(fcf))
|
|
{
|
|
|
|
case MGT_ASSOC_REQ:
|
|
fixed_tree = get_fixed_parameter_tree (mgt_tree, tvb, 0, 4);
|
|
add_fixed_field (fixed_tree, tvb, 0, FIELD_CAP_INFO);
|
|
add_fixed_field (fixed_tree, tvb, 2, FIELD_LISTEN_IVAL);
|
|
|
|
offset = 4; /* Size of fixed fields */
|
|
tagged_parameter_tree_len =
|
|
tvb_reported_length_remaining(tvb, offset);
|
|
tagged_tree = get_tagged_parameter_tree (mgt_tree, tvb, offset,
|
|
tagged_parameter_tree_len);
|
|
|
|
ieee_80211_add_tagged_parameters (tvb, offset, tagged_tree,
|
|
tagged_parameter_tree_len);
|
|
break;
|
|
|
|
|
|
case MGT_ASSOC_RESP:
|
|
fixed_tree = get_fixed_parameter_tree (mgt_tree, tvb, 0, 6);
|
|
add_fixed_field (fixed_tree, tvb, 0, FIELD_CAP_INFO);
|
|
add_fixed_field (fixed_tree, tvb, 2, FIELD_STATUS_CODE);
|
|
add_fixed_field (fixed_tree, tvb, 4, FIELD_ASSOC_ID);
|
|
|
|
offset = 6; /* Size of fixed fields */
|
|
|
|
tagged_parameter_tree_len =
|
|
tvb_reported_length_remaining(tvb, offset);
|
|
tagged_tree = get_tagged_parameter_tree (mgt_tree, tvb, offset,
|
|
tagged_parameter_tree_len);
|
|
|
|
ieee_80211_add_tagged_parameters (tvb, offset, tagged_tree,
|
|
tagged_parameter_tree_len);
|
|
break;
|
|
|
|
|
|
case MGT_REASSOC_REQ:
|
|
fixed_tree = get_fixed_parameter_tree (mgt_tree, tvb, 0, 10);
|
|
add_fixed_field (fixed_tree, tvb, 0, FIELD_CAP_INFO);
|
|
add_fixed_field (fixed_tree, tvb, 2, FIELD_LISTEN_IVAL);
|
|
add_fixed_field (fixed_tree, tvb, 4, FIELD_CURRENT_AP_ADDR);
|
|
|
|
offset = 10; /* Size of fixed fields */
|
|
tagged_parameter_tree_len =
|
|
tvb_reported_length_remaining(tvb, offset);
|
|
tagged_tree = get_tagged_parameter_tree (mgt_tree, tvb, offset,
|
|
tagged_parameter_tree_len);
|
|
|
|
ieee_80211_add_tagged_parameters (tvb, offset, tagged_tree,
|
|
tagged_parameter_tree_len);
|
|
break;
|
|
|
|
case MGT_REASSOC_RESP:
|
|
fixed_tree = get_fixed_parameter_tree (mgt_tree, tvb, 0, 10);
|
|
add_fixed_field (fixed_tree, tvb, 0, FIELD_CAP_INFO);
|
|
add_fixed_field (fixed_tree, tvb, 2, FIELD_STATUS_CODE);
|
|
add_fixed_field (fixed_tree, tvb, 4, FIELD_ASSOC_ID);
|
|
|
|
offset = 6; /* Size of fixed fields */
|
|
tagged_parameter_tree_len =
|
|
tvb_reported_length_remaining(tvb, offset);
|
|
tagged_tree = get_tagged_parameter_tree (mgt_tree, tvb, offset,
|
|
tagged_parameter_tree_len);
|
|
|
|
ieee_80211_add_tagged_parameters (tvb, offset, tagged_tree,
|
|
tagged_parameter_tree_len);
|
|
break;
|
|
|
|
|
|
case MGT_PROBE_REQ:
|
|
offset = 0;
|
|
tagged_parameter_tree_len =
|
|
tvb_reported_length_remaining(tvb, offset);
|
|
tagged_tree = get_tagged_parameter_tree (mgt_tree, tvb, offset,
|
|
tagged_parameter_tree_len);
|
|
|
|
ieee_80211_add_tagged_parameters (tvb, offset, tagged_tree,
|
|
tagged_parameter_tree_len);
|
|
break;
|
|
|
|
|
|
case MGT_PROBE_RESP:
|
|
fixed_tree = get_fixed_parameter_tree (mgt_tree, tvb, 0, 12);
|
|
add_fixed_field (fixed_tree, tvb, 0, FIELD_TIMESTAMP);
|
|
add_fixed_field (fixed_tree, tvb, 8, FIELD_BEACON_INTERVAL);
|
|
add_fixed_field (fixed_tree, tvb, 10, FIELD_CAP_INFO);
|
|
|
|
offset = 12; /* Size of fixed fields */
|
|
tagged_parameter_tree_len =
|
|
tvb_reported_length_remaining(tvb, offset);
|
|
tagged_tree = get_tagged_parameter_tree (mgt_tree, tvb, offset,
|
|
tagged_parameter_tree_len);
|
|
|
|
ieee_80211_add_tagged_parameters (tvb, offset, tagged_tree,
|
|
tagged_parameter_tree_len);
|
|
break;
|
|
|
|
|
|
case MGT_BEACON: /* Dissect protocol payload fields */
|
|
fixed_tree = get_fixed_parameter_tree (mgt_tree, tvb, 0, 12);
|
|
|
|
add_fixed_field (fixed_tree, tvb, 0, FIELD_TIMESTAMP);
|
|
add_fixed_field (fixed_tree, tvb, 8, FIELD_BEACON_INTERVAL);
|
|
add_fixed_field (fixed_tree, tvb, 10, FIELD_CAP_INFO);
|
|
|
|
offset = 12; /* Size of fixed fields */
|
|
tagged_parameter_tree_len =
|
|
tvb_reported_length_remaining(tvb, offset);
|
|
tagged_tree = get_tagged_parameter_tree (mgt_tree, tvb, offset,
|
|
tagged_parameter_tree_len);
|
|
|
|
ieee_80211_add_tagged_parameters (tvb, offset, tagged_tree,
|
|
tagged_parameter_tree_len);
|
|
break;
|
|
|
|
|
|
case MGT_ATIM:
|
|
break;
|
|
|
|
|
|
case MGT_DISASS:
|
|
fixed_tree = get_fixed_parameter_tree (mgt_tree, tvb, 0, 2);
|
|
add_fixed_field (fixed_tree, tvb, 0, FIELD_REASON_CODE);
|
|
break;
|
|
|
|
|
|
case MGT_AUTHENTICATION:
|
|
fixed_tree = get_fixed_parameter_tree (mgt_tree, tvb, 0, 6);
|
|
add_fixed_field (fixed_tree, tvb, 0, FIELD_AUTH_ALG);
|
|
add_fixed_field (fixed_tree, tvb, 2, FIELD_AUTH_TRANS_SEQ);
|
|
add_fixed_field (fixed_tree, tvb, 4, FIELD_STATUS_CODE);
|
|
|
|
offset = 6; /* Size of fixed fields */
|
|
|
|
tagged_parameter_tree_len =
|
|
tvb_reported_length_remaining(tvb, offset);
|
|
if (tagged_parameter_tree_len != 0)
|
|
{
|
|
tagged_tree = get_tagged_parameter_tree (mgt_tree,
|
|
tvb,
|
|
offset,
|
|
tagged_parameter_tree_len);
|
|
|
|
ieee_80211_add_tagged_parameters (tvb, offset, tagged_tree,
|
|
tagged_parameter_tree_len);
|
|
}
|
|
break;
|
|
|
|
|
|
case MGT_DEAUTHENTICATION:
|
|
fixed_tree = get_fixed_parameter_tree (mgt_tree, tvb, 0, 2);
|
|
add_fixed_field (fixed_tree, tvb, 0, FIELD_REASON_CODE);
|
|
break;
|
|
|
|
|
|
case MGT_ACTION:
|
|
fixed_tree = get_fixed_parameter_tree (mgt_tree, tvb, 0, 3);
|
|
add_fixed_field (fixed_tree, tvb, 0, FIELD_CATEGORY_CODE);
|
|
|
|
switch (tvb_get_guint8(tvb, 0))
|
|
{
|
|
|
|
case 17: /* Management notification frame */
|
|
add_fixed_field (fixed_tree, tvb, 1, FIELD_WME_ACTION_CODE);
|
|
add_fixed_field (fixed_tree, tvb, 2, FIELD_DIALOG_TOKEN);
|
|
add_fixed_field (fixed_tree, tvb, 3, FIELD_WME_STATUS_CODE);
|
|
|
|
offset = 4; /* Size of fixed fields */
|
|
|
|
tagged_parameter_tree_len =
|
|
tvb_reported_length_remaining(tvb, offset);
|
|
if (tagged_parameter_tree_len != 0)
|
|
{
|
|
tagged_tree = get_tagged_parameter_tree (mgt_tree, tvb, offset,
|
|
tagged_parameter_tree_len);
|
|
|
|
ieee_80211_add_tagged_parameters (tvb, offset, tagged_tree,
|
|
tagged_parameter_tree_len);
|
|
}
|
|
break;
|
|
|
|
default: /* Management action frame */
|
|
add_fixed_field (fixed_tree, tvb, 1, FIELD_ACTION_CODE);
|
|
add_fixed_field (fixed_tree, tvb, 2, FIELD_DIALOG_TOKEN);
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
set_src_addr_cols(packet_info *pinfo, const guint8 *addr, char *type)
|
|
{
|
|
if (check_col(pinfo->cinfo, COL_RES_DL_SRC))
|
|
col_add_fstr(pinfo->cinfo, COL_RES_DL_SRC, "%s (%s)",
|
|
get_ether_name(addr), type);
|
|
if (check_col(pinfo->cinfo, COL_UNRES_DL_SRC))
|
|
col_add_fstr(pinfo->cinfo, COL_UNRES_DL_SRC, "%s (%s)",
|
|
ether_to_str(addr), type);
|
|
}
|
|
|
|
static void
|
|
set_dst_addr_cols(packet_info *pinfo, const guint8 *addr, char *type)
|
|
{
|
|
if (check_col(pinfo->cinfo, COL_RES_DL_DST))
|
|
col_add_fstr(pinfo->cinfo, COL_RES_DL_DST, "%s (%s)",
|
|
get_ether_name(addr), type);
|
|
if (check_col(pinfo->cinfo, COL_UNRES_DL_DST))
|
|
col_add_fstr(pinfo->cinfo, COL_UNRES_DL_DST, "%s (%s)",
|
|
ether_to_str(addr), type);
|
|
}
|
|
|
|
typedef enum {
|
|
ENCAP_802_2,
|
|
ENCAP_IPX,
|
|
ENCAP_ETHERNET
|
|
} encap_t;
|
|
|
|
/* ************************************************************************* */
|
|
/* Dissect 802.11 frame */
|
|
/* ************************************************************************* */
|
|
static void
|
|
dissect_ieee80211_common (tvbuff_t * tvb, packet_info * pinfo,
|
|
proto_tree * tree, gboolean fixed_length_header,
|
|
gboolean has_radio_information, gint fcs_len,
|
|
gboolean wlan_broken_fc)
|
|
{
|
|
guint16 fcf, flags, frame_type_subtype;
|
|
guint16 seq_control;
|
|
guint32 seq_number, frag_number;
|
|
gboolean more_frags;
|
|
const guint8 *src = NULL, *dst = NULL;
|
|
proto_item *ti = NULL;
|
|
proto_item *flag_item;
|
|
proto_item *fc_item;
|
|
proto_tree *hdr_tree = NULL;
|
|
proto_tree *flag_tree;
|
|
proto_tree *fc_tree;
|
|
guint16 hdr_len;
|
|
gboolean has_fcs;
|
|
gint len, reported_len, ivlen;
|
|
gboolean save_fragmented;
|
|
tvbuff_t *volatile next_tvb = NULL;
|
|
guint32 addr_type;
|
|
volatile encap_t encap_type;
|
|
guint8 octet1, octet2;
|
|
char out_buff[SHORT_STR];
|
|
|
|
if (check_col (pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str (pinfo->cinfo, COL_PROTOCOL, "IEEE 802.11");
|
|
if (check_col (pinfo->cinfo, COL_INFO))
|
|
col_clear (pinfo->cinfo, COL_INFO);
|
|
|
|
/* Add the radio information, if present, to the column information */
|
|
if (has_radio_information) {
|
|
if (check_col(pinfo->cinfo, COL_TX_RATE)) {
|
|
col_add_fstr(pinfo->cinfo, COL_TX_RATE, "%u.%u",
|
|
pinfo->pseudo_header->ieee_802_11.data_rate / 2,
|
|
pinfo->pseudo_header->ieee_802_11.data_rate & 1 ? 5 : 0);
|
|
}
|
|
if (check_col(pinfo->cinfo, COL_RSSI)) {
|
|
/* XX - this is a percentage, not a dBm or normalized or raw RSSI */
|
|
col_add_fstr(pinfo->cinfo, COL_RSSI, "%u",
|
|
pinfo->pseudo_header->ieee_802_11.signal_level);
|
|
}
|
|
}
|
|
|
|
fcf = tvb_get_letohs (tvb, 0);
|
|
if (wlan_broken_fc) {
|
|
/* Swap bytes */
|
|
fcf = ((fcf & 0xff) << 8) | (((fcf & 0xff00) >> 8) & 0xff);
|
|
}
|
|
if (fixed_length_header)
|
|
hdr_len = DATA_LONG_HDR_LEN;
|
|
else
|
|
hdr_len = find_header_length (fcf);
|
|
frame_type_subtype = COMPOSE_FRAME_TYPE(fcf);
|
|
|
|
if (check_col (pinfo->cinfo, COL_INFO))
|
|
col_set_str (pinfo->cinfo, COL_INFO,
|
|
val_to_str(frame_type_subtype, frame_type_subtype_vals,
|
|
"Unrecognized (Reserved frame)"));
|
|
|
|
flags = COOK_FLAGS (fcf);
|
|
more_frags = HAVE_FRAGMENTS (flags);
|
|
|
|
/* Add the radio information, if present, and the FC to the current tree */
|
|
if (tree)
|
|
{
|
|
ti = proto_tree_add_protocol_format (tree, proto_wlan, tvb, 0, hdr_len,
|
|
"IEEE 802.11");
|
|
hdr_tree = proto_item_add_subtree (ti, ett_80211);
|
|
|
|
if (has_radio_information) {
|
|
proto_tree_add_uint_format(hdr_tree, hf_data_rate,
|
|
tvb, 0, 0,
|
|
pinfo->pseudo_header->ieee_802_11.data_rate,
|
|
"Data Rate: %u.%u Mb/s",
|
|
pinfo->pseudo_header->ieee_802_11.data_rate / 2,
|
|
pinfo->pseudo_header->ieee_802_11.data_rate & 1 ? 5 : 0);
|
|
|
|
proto_tree_add_uint(hdr_tree, hf_channel,
|
|
tvb, 0, 0,
|
|
pinfo->pseudo_header->ieee_802_11.channel);
|
|
|
|
proto_tree_add_uint_format(hdr_tree, hf_signal_strength,
|
|
tvb, 0, 0,
|
|
pinfo->pseudo_header->ieee_802_11.signal_level,
|
|
"Signal Strength: %u%%",
|
|
pinfo->pseudo_header->ieee_802_11.signal_level);
|
|
}
|
|
|
|
proto_tree_add_uint (hdr_tree, hf_fc_frame_type_subtype,
|
|
tvb,
|
|
wlan_broken_fc?1:0, 1,
|
|
frame_type_subtype);
|
|
|
|
fc_item = proto_tree_add_uint_format (hdr_tree, hf_fc_field, tvb,
|
|
0, 2,
|
|
fcf,
|
|
"Frame Control: 0x%04X (%s)",
|
|
fcf, wlan_broken_fc?"Swapped":"Normal");
|
|
|
|
fc_tree = proto_item_add_subtree (fc_item, ett_fc_tree);
|
|
|
|
|
|
proto_tree_add_uint (fc_tree, hf_fc_proto_version, tvb,
|
|
wlan_broken_fc?1:0, 1,
|
|
COOK_PROT_VERSION (fcf));
|
|
|
|
proto_tree_add_uint (fc_tree, hf_fc_frame_type, tvb,
|
|
wlan_broken_fc?1:0, 1,
|
|
COOK_FRAME_TYPE (fcf));
|
|
|
|
proto_tree_add_uint (fc_tree, hf_fc_frame_subtype,
|
|
tvb,
|
|
wlan_broken_fc?1:0, 1,
|
|
COOK_FRAME_SUBTYPE (fcf));
|
|
|
|
flag_item =
|
|
proto_tree_add_uint_format (fc_tree, hf_fc_flags, tvb,
|
|
wlan_broken_fc?0:1, 1,
|
|
flags, "Flags: 0x%X", flags);
|
|
|
|
flag_tree = proto_item_add_subtree (flag_item, ett_proto_flags);
|
|
|
|
proto_tree_add_uint (flag_tree, hf_fc_data_ds, tvb,
|
|
wlan_broken_fc?0:1, 1,
|
|
COOK_DS_STATUS (flags));
|
|
proto_tree_add_boolean_hidden (flag_tree, hf_fc_to_ds, tvb, 1, 1,
|
|
flags);
|
|
proto_tree_add_boolean_hidden (flag_tree, hf_fc_from_ds, tvb, 1, 1,
|
|
flags);
|
|
|
|
proto_tree_add_boolean (flag_tree, hf_fc_more_frag, tvb,
|
|
wlan_broken_fc?0:1, 1,
|
|
flags);
|
|
|
|
proto_tree_add_boolean (flag_tree, hf_fc_retry, tvb,
|
|
wlan_broken_fc?0:1, 1, flags);
|
|
|
|
proto_tree_add_boolean (flag_tree, hf_fc_pwr_mgt, tvb,
|
|
wlan_broken_fc?0:1, 1, flags);
|
|
|
|
proto_tree_add_boolean (flag_tree, hf_fc_more_data, tvb,
|
|
wlan_broken_fc?0:1, 1,
|
|
flags);
|
|
|
|
proto_tree_add_boolean (flag_tree, hf_fc_wep, tvb,
|
|
wlan_broken_fc?0:1, 1, flags);
|
|
|
|
proto_tree_add_boolean (flag_tree, hf_fc_order, tvb,
|
|
wlan_broken_fc?0:1, 1, flags);
|
|
|
|
if (frame_type_subtype == CTRL_PS_POLL)
|
|
proto_tree_add_uint(hdr_tree, hf_assoc_id,tvb,2,2,
|
|
COOK_ASSOC_ID(tvb_get_letohs(tvb,2)));
|
|
|
|
else
|
|
proto_tree_add_uint (hdr_tree, hf_did_duration, tvb, 2, 2,
|
|
tvb_get_letohs (tvb, 2));
|
|
}
|
|
|
|
/*
|
|
* Decode the part of the frame header that isn't the same for all
|
|
* frame types.
|
|
*/
|
|
seq_control = 0;
|
|
frag_number = 0;
|
|
seq_number = 0;
|
|
|
|
switch (COOK_FRAME_TYPE (fcf))
|
|
{
|
|
|
|
case MGT_FRAME:
|
|
/*
|
|
* All management frame types have the same header.
|
|
*/
|
|
src = tvb_get_ptr (tvb, 10, 6);
|
|
dst = tvb_get_ptr (tvb, 4, 6);
|
|
|
|
SET_ADDRESS(&pinfo->dl_src, AT_ETHER, 6, src);
|
|
SET_ADDRESS(&pinfo->src, AT_ETHER, 6, src);
|
|
SET_ADDRESS(&pinfo->dl_dst, AT_ETHER, 6, dst);
|
|
SET_ADDRESS(&pinfo->dst, AT_ETHER, 6, dst);
|
|
|
|
seq_control = tvb_get_letohs(tvb, 22);
|
|
frag_number = COOK_FRAGMENT_NUMBER(seq_control);
|
|
seq_number = COOK_SEQUENCE_NUMBER(seq_control);
|
|
|
|
if (tree)
|
|
{
|
|
proto_tree_add_ether (hdr_tree, hf_addr_da, tvb, 4, 6, dst);
|
|
|
|
proto_tree_add_ether (hdr_tree, hf_addr_sa, tvb, 10, 6, src);
|
|
|
|
/* add items for wlan.addr filter */
|
|
proto_tree_add_ether_hidden(hdr_tree, hf_addr, tvb, 4, 6, dst);
|
|
proto_tree_add_ether_hidden(hdr_tree, hf_addr, tvb, 10, 6, src);
|
|
|
|
proto_tree_add_ether (hdr_tree, hf_addr_bssid, tvb, 16, 6,
|
|
tvb_get_ptr (tvb, 16, 6));
|
|
|
|
proto_tree_add_uint (hdr_tree, hf_frag_number, tvb, 22, 2,
|
|
frag_number);
|
|
|
|
proto_tree_add_uint (hdr_tree, hf_seq_number, tvb, 22, 2,
|
|
seq_number);
|
|
}
|
|
break;
|
|
|
|
case CONTROL_FRAME:
|
|
switch (frame_type_subtype)
|
|
{
|
|
|
|
case CTRL_PS_POLL:
|
|
src = tvb_get_ptr (tvb, 10, 6);
|
|
dst = tvb_get_ptr (tvb, 4, 6);
|
|
|
|
set_src_addr_cols(pinfo, src, "BSSID");
|
|
set_dst_addr_cols(pinfo, dst, "BSSID");
|
|
|
|
if (tree)
|
|
{
|
|
proto_tree_add_ether (hdr_tree, hf_addr_bssid, tvb, 4, 6, dst);
|
|
|
|
proto_tree_add_ether (hdr_tree, hf_addr_ta, tvb, 10, 6, src);
|
|
}
|
|
break;
|
|
|
|
|
|
case CTRL_RTS:
|
|
src = tvb_get_ptr (tvb, 10, 6);
|
|
dst = tvb_get_ptr (tvb, 4, 6);
|
|
|
|
set_src_addr_cols(pinfo, src, "TA");
|
|
set_dst_addr_cols(pinfo, dst, "RA");
|
|
|
|
if (tree)
|
|
{
|
|
proto_tree_add_ether (hdr_tree, hf_addr_ra, tvb, 4, 6, dst);
|
|
|
|
proto_tree_add_ether (hdr_tree, hf_addr_ta, tvb, 10, 6, src);
|
|
}
|
|
break;
|
|
|
|
|
|
case CTRL_CTS:
|
|
dst = tvb_get_ptr (tvb, 4, 6);
|
|
|
|
set_dst_addr_cols(pinfo, dst, "RA");
|
|
|
|
if (tree)
|
|
proto_tree_add_ether (hdr_tree, hf_addr_ra, tvb, 4, 6, dst);
|
|
break;
|
|
|
|
|
|
case CTRL_ACKNOWLEDGEMENT:
|
|
dst = tvb_get_ptr (tvb, 4, 6);
|
|
|
|
set_dst_addr_cols(pinfo, dst, "RA");
|
|
|
|
if (tree)
|
|
proto_tree_add_ether (hdr_tree, hf_addr_ra, tvb, 4, 6, dst);
|
|
break;
|
|
|
|
|
|
case CTRL_CFP_END:
|
|
src = tvb_get_ptr (tvb, 10, 6);
|
|
dst = tvb_get_ptr (tvb, 4, 6);
|
|
|
|
set_src_addr_cols(pinfo, src, "BSSID");
|
|
set_dst_addr_cols(pinfo, dst, "RA");
|
|
|
|
if (tree)
|
|
{
|
|
proto_tree_add_ether (hdr_tree, hf_addr_ra, tvb, 4, 6, dst);
|
|
proto_tree_add_ether (hdr_tree, hf_addr_bssid, tvb, 10, 6, src);
|
|
}
|
|
break;
|
|
|
|
|
|
case CTRL_CFP_ENDACK:
|
|
src = tvb_get_ptr (tvb, 10, 6);
|
|
dst = tvb_get_ptr (tvb, 4, 6);
|
|
|
|
set_src_addr_cols(pinfo, src, "BSSID");
|
|
set_dst_addr_cols(pinfo, dst, "RA");
|
|
|
|
if (tree)
|
|
{
|
|
proto_tree_add_ether (hdr_tree, hf_addr_ra, tvb, 4, 6, dst);
|
|
|
|
proto_tree_add_ether (hdr_tree, hf_addr_bssid, tvb, 10, 6, src);
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case DATA_FRAME:
|
|
addr_type = COOK_ADDR_SELECTOR (fcf);
|
|
|
|
/* In order to show src/dst address we must always do the following */
|
|
switch (addr_type)
|
|
{
|
|
|
|
case DATA_ADDR_T1:
|
|
src = tvb_get_ptr (tvb, 10, 6);
|
|
dst = tvb_get_ptr (tvb, 4, 6);
|
|
break;
|
|
|
|
|
|
case DATA_ADDR_T2:
|
|
src = tvb_get_ptr (tvb, 16, 6);
|
|
dst = tvb_get_ptr (tvb, 4, 6);
|
|
break;
|
|
|
|
|
|
case DATA_ADDR_T3:
|
|
src = tvb_get_ptr (tvb, 10, 6);
|
|
dst = tvb_get_ptr (tvb, 16, 6);
|
|
break;
|
|
|
|
|
|
case DATA_ADDR_T4:
|
|
src = tvb_get_ptr (tvb, 24, 6);
|
|
dst = tvb_get_ptr (tvb, 16, 6);
|
|
break;
|
|
}
|
|
|
|
SET_ADDRESS(&pinfo->dl_src, AT_ETHER, 6, src);
|
|
SET_ADDRESS(&pinfo->src, AT_ETHER, 6, src);
|
|
SET_ADDRESS(&pinfo->dl_dst, AT_ETHER, 6, dst);
|
|
SET_ADDRESS(&pinfo->dst, AT_ETHER, 6, dst);
|
|
|
|
seq_control = tvb_get_letohs(tvb, 22);
|
|
frag_number = COOK_FRAGMENT_NUMBER(seq_control);
|
|
seq_number = COOK_SEQUENCE_NUMBER(seq_control);
|
|
|
|
/* Now if we have a tree we start adding stuff */
|
|
if (tree)
|
|
{
|
|
|
|
|
|
switch (addr_type)
|
|
{
|
|
|
|
case DATA_ADDR_T1:
|
|
proto_tree_add_ether (hdr_tree, hf_addr_da, tvb, 4, 6, dst);
|
|
proto_tree_add_ether (hdr_tree, hf_addr_sa, tvb, 10, 6, src);
|
|
proto_tree_add_ether (hdr_tree, hf_addr_bssid, tvb, 16, 6,
|
|
tvb_get_ptr (tvb, 16, 6));
|
|
proto_tree_add_uint (hdr_tree, hf_frag_number, tvb, 22, 2,
|
|
frag_number);
|
|
proto_tree_add_uint (hdr_tree, hf_seq_number, tvb, 22, 2,
|
|
seq_number);
|
|
|
|
/* add items for wlan.addr filter */
|
|
proto_tree_add_ether_hidden(hdr_tree, hf_addr, tvb, 4, 6, dst);
|
|
proto_tree_add_ether_hidden(hdr_tree, hf_addr, tvb, 10, 6, src);
|
|
break;
|
|
|
|
|
|
case DATA_ADDR_T2:
|
|
proto_tree_add_ether (hdr_tree, hf_addr_da, tvb, 4, 6, dst);
|
|
proto_tree_add_ether (hdr_tree, hf_addr_bssid, tvb, 10, 6,
|
|
tvb_get_ptr (tvb, 10, 6));
|
|
proto_tree_add_ether (hdr_tree, hf_addr_sa, tvb, 16, 6, src);
|
|
proto_tree_add_uint (hdr_tree, hf_frag_number, tvb, 22, 2,
|
|
frag_number);
|
|
proto_tree_add_uint (hdr_tree, hf_seq_number, tvb, 22, 2,
|
|
seq_number);
|
|
|
|
/* add items for wlan.addr filter */
|
|
proto_tree_add_ether_hidden(hdr_tree, hf_addr, tvb, 4, 6, dst);
|
|
proto_tree_add_ether_hidden(hdr_tree, hf_addr, tvb, 16, 6, src);
|
|
break;
|
|
|
|
|
|
case DATA_ADDR_T3:
|
|
proto_tree_add_ether (hdr_tree, hf_addr_bssid, tvb, 4, 6,
|
|
tvb_get_ptr (tvb, 4, 6));
|
|
proto_tree_add_ether (hdr_tree, hf_addr_sa, tvb, 10, 6, src);
|
|
proto_tree_add_ether (hdr_tree, hf_addr_da, tvb, 16, 6, dst);
|
|
|
|
proto_tree_add_uint (hdr_tree, hf_frag_number, tvb, 22, 2,
|
|
frag_number);
|
|
proto_tree_add_uint (hdr_tree, hf_seq_number, tvb, 22, 2,
|
|
seq_number);
|
|
|
|
/* add items for wlan.addr filter */
|
|
proto_tree_add_ether_hidden(hdr_tree, hf_addr, tvb, 10, 6, src);
|
|
proto_tree_add_ether_hidden(hdr_tree, hf_addr, tvb, 16, 6, dst);
|
|
break;
|
|
|
|
|
|
case DATA_ADDR_T4:
|
|
proto_tree_add_ether (hdr_tree, hf_addr_ra, tvb, 4, 6,
|
|
tvb_get_ptr (tvb, 4, 6));
|
|
proto_tree_add_ether (hdr_tree, hf_addr_ta, tvb, 10, 6,
|
|
tvb_get_ptr (tvb, 10, 6));
|
|
proto_tree_add_ether (hdr_tree, hf_addr_da, tvb, 16, 6, dst);
|
|
proto_tree_add_uint (hdr_tree, hf_frag_number, tvb, 22, 2,
|
|
frag_number);
|
|
proto_tree_add_uint (hdr_tree, hf_seq_number, tvb, 22, 2,
|
|
seq_number);
|
|
proto_tree_add_ether (hdr_tree, hf_addr_sa, tvb, 24, 6, src);
|
|
|
|
/* add items for wlan.addr filter */
|
|
proto_tree_add_ether_hidden(hdr_tree, hf_addr, tvb, 16, 6, dst);
|
|
proto_tree_add_ether_hidden(hdr_tree, hf_addr, tvb, 24, 6, src);
|
|
break;
|
|
}
|
|
|
|
}
|
|
break;
|
|
}
|
|
|
|
len = tvb_length_remaining(tvb, hdr_len);
|
|
reported_len = tvb_reported_length_remaining(tvb, hdr_len);
|
|
|
|
switch (fcs_len)
|
|
{
|
|
case 0: /* Definitely has no FCS */
|
|
has_fcs = FALSE;
|
|
break;
|
|
|
|
case 4: /* Definitely has an FCS */
|
|
has_fcs = TRUE;
|
|
break;
|
|
|
|
default: /* Don't know - use "wlan_check_fcs" */
|
|
has_fcs = wlan_check_fcs;
|
|
break;
|
|
}
|
|
if (has_fcs)
|
|
{
|
|
/*
|
|
* Well, this packet should, in theory, have an FCS.
|
|
* Do we have the entire packet, and does it have enough data for
|
|
* the FCS?
|
|
*/
|
|
if (reported_len < 4)
|
|
{
|
|
/*
|
|
* The packet is claimed not to even have enough data for a 4-byte
|
|
* FCS.
|
|
* Pretend it doesn't have an FCS.
|
|
*/
|
|
;
|
|
}
|
|
else if (len < reported_len)
|
|
{
|
|
/*
|
|
* The packet is claimed to have enough data for a 4-byte FCS, but
|
|
* we didn't capture all of the packet.
|
|
* Slice off the 4-byte FCS from the reported length, and trim the
|
|
* captured length so it's no more than the reported length; that
|
|
* will slice off what of the FCS, if any, is in the captured
|
|
* length.
|
|
*/
|
|
reported_len -= 4;
|
|
if (len > reported_len)
|
|
len = reported_len;
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* We have the entire packet, and it includes a 4-byte FCS.
|
|
* Slice it off, and put it into the tree.
|
|
*/
|
|
len -= 4;
|
|
reported_len -= 4;
|
|
if (tree)
|
|
{
|
|
guint32 fcs = crc32_802_tvb(tvb, hdr_len + len);
|
|
guint32 sent_fcs = tvb_get_ntohl(tvb, hdr_len + len);
|
|
if (fcs == sent_fcs)
|
|
proto_tree_add_uint_format(hdr_tree, hf_fcs, tvb,
|
|
hdr_len + len, 4, sent_fcs,
|
|
"Frame check sequence: 0x%08x (correct)", sent_fcs);
|
|
else
|
|
proto_tree_add_uint_format(hdr_tree, hf_fcs, tvb,
|
|
hdr_len + len, 4, sent_fcs,
|
|
"Frame check sequence: 0x%08x (incorrect, should be 0x%08x)",
|
|
sent_fcs, fcs);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (tree && (frame_type_subtype == DATA_QOS_DATA || frame_type_subtype == DATA_QOS_NULL)) {
|
|
proto_item *qos_fields;
|
|
proto_tree *qos_tree;
|
|
|
|
guint16 qos_control, qos_priority, qos_ack_policy;
|
|
|
|
qos_fields = proto_tree_add_text(hdr_tree, tvb, hdr_len - 2, 2,
|
|
"QoS parameters");
|
|
qos_tree = proto_item_add_subtree (qos_fields, ett_qos_parameters);
|
|
|
|
qos_control = tvb_get_letohs(tvb, hdr_len - 2);
|
|
qos_priority = COOK_QOS_PRIORITY(qos_control);
|
|
qos_ack_policy = COOK_QOS_ACK_POLICY(qos_control);
|
|
proto_tree_add_uint_format (qos_tree, hf_qos_priority, tvb,
|
|
hdr_len - 2, 2, qos_priority,
|
|
"Priority: %d (%s) (%s)",
|
|
qos_priority, qos_tags[qos_priority], qos_acs[qos_priority]);
|
|
proto_tree_add_uint_format (qos_tree, hf_qos_ack_policy, tvb,
|
|
hdr_len - 2, 2, qos_ack_policy,
|
|
"Ack Policy: %d (%sAcknowledge)",
|
|
qos_ack_policy, qos_ack_policy ? "Do not " : "");
|
|
}
|
|
|
|
/*
|
|
* Only management and data frames have a body, so we don't have
|
|
* anything more to do for other types of frames.
|
|
*/
|
|
switch (COOK_FRAME_TYPE (fcf))
|
|
{
|
|
|
|
case MGT_FRAME:
|
|
break;
|
|
|
|
case DATA_FRAME:
|
|
/*
|
|
* No-data frames don't have a body.
|
|
*/
|
|
switch (frame_type_subtype)
|
|
{
|
|
|
|
case DATA_NULL_FUNCTION:
|
|
case DATA_CF_ACK_NOD:
|
|
case DATA_CF_POLL_NOD:
|
|
case DATA_CF_ACK_POLL_NOD:
|
|
case DATA_QOS_NULL:
|
|
return;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
return;
|
|
}
|
|
|
|
if (IS_WEP(COOK_FLAGS(fcf))) {
|
|
/*
|
|
* It's a WEP-encrypted frame; dissect the WEP parameters and decrypt
|
|
* the data, if we have a matching key. Otherwise display it as data.
|
|
*/
|
|
gboolean can_decrypt = FALSE;
|
|
proto_tree *wep_tree = NULL;
|
|
guint32 iv;
|
|
guint8 key, keybyte;
|
|
|
|
keybyte = tvb_get_guint8(tvb, hdr_len + 3);
|
|
key = COOK_WEP_KEY(keybyte);
|
|
if ((keybyte & KEY_EXTIV) && (len >= EXTIV_LEN)) {
|
|
/* Extended IV; this frame is likely encrypted with TKIP or CCMP */
|
|
if (tree) {
|
|
proto_item *extiv_fields;
|
|
|
|
extiv_fields = proto_tree_add_text(hdr_tree, tvb, hdr_len, 8,
|
|
"TKIP/CCMP parameters");
|
|
wep_tree = proto_item_add_subtree (extiv_fields, ett_wep_parameters);
|
|
/* It is unknown whether this is a TKIP or CCMP encrypted packet, so
|
|
* display both packet number alternatives unless the ExtIV can be
|
|
* determined to be possible only with one of the encryption protocols.
|
|
*/
|
|
if (tvb_get_guint8(tvb, hdr_len + 1) & 0x20) {
|
|
snprintf(out_buff, SHORT_STR, "0x%08X%02X%02X",
|
|
tvb_get_letohl(tvb, hdr_len + 4),
|
|
tvb_get_guint8(tvb, hdr_len),
|
|
tvb_get_guint8(tvb, hdr_len + 2));
|
|
proto_tree_add_string(wep_tree, hf_tkip_extiv, tvb, hdr_len,
|
|
EXTIV_LEN, out_buff);
|
|
}
|
|
if (tvb_get_guint8(tvb, hdr_len + 2) == 0) {
|
|
snprintf(out_buff, SHORT_STR, "0x%08X%02X%02X",
|
|
tvb_get_letohl(tvb, hdr_len + 4),
|
|
tvb_get_guint8(tvb, hdr_len + 1),
|
|
tvb_get_guint8(tvb, hdr_len));
|
|
proto_tree_add_string(wep_tree, hf_ccmp_extiv, tvb, hdr_len,
|
|
EXTIV_LEN, out_buff);
|
|
}
|
|
proto_tree_add_uint(wep_tree, hf_wep_key, tvb, hdr_len + 3, 1, key);
|
|
}
|
|
|
|
/* Subtract out the length of the IV. */
|
|
len -= EXTIV_LEN;
|
|
reported_len -= EXTIV_LEN;
|
|
ivlen = EXTIV_LEN;
|
|
/* It is unknown whether this is TKIP or CCMP, so let's not even try to
|
|
* parse TKIP Michael MIC+ICV or CCMP MIC. */
|
|
} else {
|
|
/* No Ext. IV - WEP packet */
|
|
/*
|
|
* XXX - pass the IV and key to "try_decrypt_wep()", and have it pass
|
|
* them to "wep_decrypt()", rather than having "wep_decrypt()" extract
|
|
* them itself.
|
|
*
|
|
* Also, just pass the data *following* the WEP parameters as the
|
|
* buffer to decrypt.
|
|
*/
|
|
iv = tvb_get_letoh24(tvb, hdr_len);
|
|
if (tree) {
|
|
proto_item *wep_fields;
|
|
|
|
wep_fields = proto_tree_add_text(hdr_tree, tvb, hdr_len, 4,
|
|
"WEP parameters");
|
|
|
|
wep_tree = proto_item_add_subtree (wep_fields, ett_wep_parameters);
|
|
proto_tree_add_uint (wep_tree, hf_wep_iv, tvb, hdr_len, 3, iv);
|
|
}
|
|
if (tree)
|
|
proto_tree_add_uint (wep_tree, hf_wep_key, tvb, hdr_len + 3, 1, key);
|
|
|
|
/* Subtract out the length of the IV. */
|
|
len -= 4;
|
|
reported_len -= 4;
|
|
ivlen = 4;
|
|
|
|
/*
|
|
* Well, this packet should, in theory, have an ICV.
|
|
* Do we have the entire packet, and does it have enough data for
|
|
* the ICV?
|
|
*/
|
|
if (reported_len < 4) {
|
|
/*
|
|
* The packet is claimed not to even have enough data for a
|
|
* 4-byte ICV.
|
|
* Pretend it doesn't have an ICV.
|
|
*/
|
|
;
|
|
} else if (len < reported_len) {
|
|
/*
|
|
* The packet is claimed to have enough data for a 4-byte ICV,
|
|
* but we didn't capture all of the packet.
|
|
* Slice off the 4-byte ICV from the reported length, and trim
|
|
* the captured length so it's no more than the reported length;
|
|
* that will slice off what of the ICV, if any, is in the
|
|
* captured length.
|
|
*
|
|
*/
|
|
reported_len -= 4;
|
|
if (len > reported_len)
|
|
len = reported_len;
|
|
} else {
|
|
/*
|
|
* We have the entire packet, and it includes a 4-byte ICV.
|
|
* Slice it off, and put it into the tree.
|
|
*
|
|
* We only support decrypting if we have the the ICV.
|
|
*
|
|
* XXX - the ICV is encrypted; we're putting the encrypted
|
|
* value, not the decrypted value, into the tree.
|
|
*/
|
|
len -= 4;
|
|
reported_len -= 4;
|
|
can_decrypt = TRUE;
|
|
}
|
|
}
|
|
|
|
if (!can_decrypt || (next_tvb = try_decrypt_wep(tvb, hdr_len, reported_len + 8)) == NULL) {
|
|
/*
|
|
* WEP decode impossible or failed, treat payload as raw data
|
|
* and don't attempt fragment reassembly or further dissection.
|
|
*/
|
|
next_tvb = tvb_new_subset(tvb, hdr_len + ivlen, len, reported_len);
|
|
|
|
if (tree && can_decrypt)
|
|
proto_tree_add_uint_format (wep_tree, hf_wep_icv, tvb,
|
|
hdr_len + ivlen + len, 4,
|
|
tvb_get_ntohl(tvb, hdr_len + ivlen + len),
|
|
"WEP ICV: 0x%08x (not verified)",
|
|
tvb_get_ntohl(tvb, hdr_len + ivlen + len));
|
|
|
|
if (pinfo->ethertype != ETHERTYPE_CENTRINO_PROMISC)
|
|
{
|
|
/* Some wireless drivers (such as Centrino) WEP payload already decrypted */
|
|
call_dissector(data_handle, next_tvb, pinfo, tree);
|
|
return;
|
|
}
|
|
} else {
|
|
|
|
if (tree)
|
|
proto_tree_add_uint_format (wep_tree, hf_wep_icv, tvb,
|
|
hdr_len + ivlen + len, 4,
|
|
tvb_get_ntohl(tvb, hdr_len + ivlen + len),
|
|
"WEP ICV: 0x%08x (correct)",
|
|
tvb_get_ntohl(tvb, hdr_len + ivlen + len));
|
|
|
|
add_new_data_source(pinfo, next_tvb, "Decrypted WEP data");
|
|
}
|
|
|
|
/*
|
|
* WEP decryption successful!
|
|
*
|
|
* Use the tvbuff we got back from the decryption; the data starts at
|
|
* the beginning. The lengths are already correct for the decoded WEP
|
|
* payload.
|
|
*/
|
|
hdr_len = 0;
|
|
|
|
} else {
|
|
/*
|
|
* Not a WEP-encrypted frame; just use the data from the tvbuff
|
|
* handed to us.
|
|
*
|
|
* The payload starts at "hdr_len" (i.e., just past the 802.11
|
|
* MAC header), the length of data in the tvbuff following the
|
|
* 802.11 header is "len", and the length of data in the packet
|
|
* following the 802.11 header is "reported_len".
|
|
*/
|
|
next_tvb = tvb;
|
|
}
|
|
|
|
/*
|
|
* Do defragmentation if "wlan_defragment" is true, and we have more
|
|
* fragments or this isn't the first fragment.
|
|
*
|
|
* We have to do some special handling to catch frames that
|
|
* have the "More Fragments" indicator not set but that
|
|
* don't show up as reassembled and don't have any other
|
|
* fragments present. Some networking interfaces appear
|
|
* to do reassembly even when you're capturing raw packets
|
|
* *and* show the reassembled packet without the "More
|
|
* Fragments" indicator set *but* with a non-zero fragment
|
|
* number.
|
|
*
|
|
* "fragment_add_seq_802_11()" handles that; we want to call it
|
|
* even if we have a short frame, so that it does those checks - if
|
|
* the frame is short, it doesn't do reassembly on it.
|
|
*
|
|
* (This could get some false positives if we really *did* only
|
|
* capture the last fragment of a fragmented packet, but that's
|
|
* life.)
|
|
*/
|
|
save_fragmented = pinfo->fragmented;
|
|
if (wlan_defragment && (more_frags || frag_number != 0)) {
|
|
fragment_data *fd_head;
|
|
|
|
/*
|
|
* If we've already seen this frame, look it up in the
|
|
* table of reassembled packets, otherwise add it to
|
|
* whatever reassembly is in progress, if any, and see
|
|
* if it's done.
|
|
*/
|
|
fd_head = fragment_add_seq_802_11(next_tvb, hdr_len, pinfo, seq_number,
|
|
wlan_fragment_table,
|
|
wlan_reassembled_table,
|
|
frag_number,
|
|
reported_len,
|
|
more_frags);
|
|
next_tvb = process_reassembled_data(tvb, hdr_len, pinfo,
|
|
"Reassembled 802.11", fd_head,
|
|
&frag_items, NULL, hdr_tree);
|
|
} else {
|
|
/*
|
|
* If this is the first fragment, dissect its contents, otherwise
|
|
* just show it as a fragment.
|
|
*/
|
|
if (frag_number != 0) {
|
|
/* Not the first fragment - don't dissect it. */
|
|
next_tvb = NULL;
|
|
} else {
|
|
/* First fragment, or not fragmented. Dissect what we have here. */
|
|
|
|
/* Get a tvbuff for the payload. */
|
|
next_tvb = tvb_new_subset (next_tvb, hdr_len, len, reported_len);
|
|
|
|
/*
|
|
* If this is the first fragment, but not the only fragment,
|
|
* tell the next protocol that.
|
|
*/
|
|
if (more_frags)
|
|
pinfo->fragmented = TRUE;
|
|
else
|
|
pinfo->fragmented = FALSE;
|
|
}
|
|
}
|
|
|
|
if (next_tvb == NULL) {
|
|
/* Just show this as an incomplete fragment. */
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Fragmented IEEE 802.11 frame");
|
|
next_tvb = tvb_new_subset (tvb, hdr_len, len, reported_len);
|
|
call_dissector(data_handle, next_tvb, pinfo, tree);
|
|
pinfo->fragmented = save_fragmented;
|
|
return;
|
|
}
|
|
|
|
switch (COOK_FRAME_TYPE (fcf))
|
|
{
|
|
|
|
case MGT_FRAME:
|
|
dissect_ieee80211_mgt (fcf, next_tvb, pinfo, tree);
|
|
break;
|
|
|
|
|
|
case DATA_FRAME:
|
|
/* I guess some bridges take Netware Ethernet_802_3 frames,
|
|
which are 802.3 frames (with a length field rather than
|
|
a type field, but with no 802.2 header in the payload),
|
|
and just stick the payload into an 802.11 frame. I've seen
|
|
captures that show frames of that sort.
|
|
|
|
We also handle some odd form of encapsulation in which a
|
|
complete Ethernet frame is encapsulated within an 802.11
|
|
data frame, with no 802.2 header. This has been seen
|
|
from some hardware.
|
|
|
|
So, if the packet doesn't start with 0xaa 0xaa:
|
|
|
|
we first use the same scheme that linux-wlan-ng does to detect
|
|
those encapsulated Ethernet frames, namely looking to see whether
|
|
the frame either starts with 6 octets that match the destination
|
|
address from the 802.11 header or has 6 octets that match the
|
|
source address from the 802.11 header following the first 6 octets,
|
|
and, if so, treat it as an encapsulated Ethernet frame;
|
|
|
|
otherwise, we use the same scheme that we use in the Ethernet
|
|
dissector to recognize Netware 802.3 frames, namely checking
|
|
whether the packet starts with 0xff 0xff and, if so, treat it
|
|
as an encapsulated IPX frame. */
|
|
encap_type = ENCAP_802_2;
|
|
TRY {
|
|
octet1 = tvb_get_guint8(next_tvb, 0);
|
|
octet2 = tvb_get_guint8(next_tvb, 1);
|
|
if (octet1 != 0xaa || octet2 != 0xaa) {
|
|
src = tvb_get_ptr (next_tvb, 6, 6);
|
|
dst = tvb_get_ptr (next_tvb, 0, 6);
|
|
if (memcmp(src, pinfo->dl_src.data, 6) == 0 ||
|
|
memcmp(dst, pinfo->dl_dst.data, 6) == 0)
|
|
encap_type = ENCAP_ETHERNET;
|
|
else if (octet1 == 0xff && octet2 == 0xff)
|
|
encap_type = ENCAP_IPX;
|
|
}
|
|
}
|
|
CATCH2(BoundsError, ReportedBoundsError) {
|
|
; /* do nothing */
|
|
|
|
}
|
|
ENDTRY;
|
|
|
|
switch (encap_type) {
|
|
|
|
case ENCAP_802_2:
|
|
call_dissector(llc_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
|
|
case ENCAP_ETHERNET:
|
|
call_dissector(eth_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
|
|
case ENCAP_IPX:
|
|
call_dissector(ipx_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
pinfo->fragmented = save_fragmented;
|
|
}
|
|
|
|
/*
|
|
* Dissect 802.11 with a variable-length link-layer header.
|
|
*/
|
|
static void
|
|
dissect_ieee80211 (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
|
|
{
|
|
dissect_ieee80211_common (tvb, pinfo, tree, FALSE, FALSE,
|
|
pinfo->pseudo_header->ieee_802_11.fcs_len, FALSE);
|
|
}
|
|
|
|
/*
|
|
* Dissect 802.11 with a variable-length link-layer header and a pseudo-
|
|
* header containing radio information.
|
|
*/
|
|
static void
|
|
dissect_ieee80211_radio (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
|
|
{
|
|
dissect_ieee80211_common (tvb, pinfo, tree, FALSE, TRUE,
|
|
pinfo->pseudo_header->ieee_802_11.fcs_len, FALSE);
|
|
}
|
|
|
|
/*
|
|
* Dissect 802.11 with a variable-length link-layer header and a byte-swapped
|
|
* control field (some hardware sends out LWAPP-encapsulated 802.11
|
|
* packets with the control field byte swapped).
|
|
*/
|
|
static void
|
|
dissect_ieee80211_bsfc (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
|
|
{
|
|
dissect_ieee80211_common (tvb, pinfo, tree, FALSE, FALSE, FALSE, TRUE);
|
|
}
|
|
|
|
/*
|
|
* Dissect 802.11 with a fixed-length link-layer header (padded to the
|
|
* maximum length).
|
|
*/
|
|
static void
|
|
dissect_ieee80211_fixed (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
|
|
{
|
|
dissect_ieee80211_common (tvb, pinfo, tree, TRUE, FALSE, FALSE, FALSE);
|
|
}
|
|
|
|
static void
|
|
wlan_defragment_init(void)
|
|
{
|
|
fragment_table_init(&wlan_fragment_table);
|
|
reassembled_table_init(&wlan_reassembled_table);
|
|
}
|
|
|
|
void
|
|
proto_register_ieee80211 (void)
|
|
{
|
|
static const value_string frame_type[] = {
|
|
{MGT_FRAME, "Management frame"},
|
|
{CONTROL_FRAME, "Control frame"},
|
|
{DATA_FRAME, "Data frame"},
|
|
{0, NULL}
|
|
};
|
|
|
|
static const value_string tofrom_ds[] = {
|
|
{0, "Not leaving DS or network is operating in AD-HOC mode (To DS: 0 From DS: 0)"},
|
|
{FLAG_TO_DS, "Frame is entering DS (To DS: 1 From DS: 0)"},
|
|
{FLAG_FROM_DS, "Frame is exiting DS (To DS: 0 From DS: 1)"},
|
|
{FLAG_TO_DS|FLAG_FROM_DS, "Frame part of WDS (To DS: 1 From DS: 1)"},
|
|
{0, NULL}
|
|
};
|
|
|
|
static const true_false_string tods_flag = {
|
|
"Frame is entering DS",
|
|
"Frame is not entering DS"
|
|
};
|
|
|
|
static const true_false_string fromds_flag = {
|
|
"Frame is exiting DS",
|
|
"Frame is not exiting DS"
|
|
};
|
|
|
|
static const true_false_string more_frags = {
|
|
"More fragments follow",
|
|
"This is the last fragment"
|
|
};
|
|
|
|
static const true_false_string retry_flags = {
|
|
"Frame is being retransmitted",
|
|
"Frame is not being retransmitted"
|
|
};
|
|
|
|
static const true_false_string pm_flags = {
|
|
"STA will go to sleep",
|
|
"STA will stay up"
|
|
};
|
|
|
|
static const true_false_string md_flags = {
|
|
"Data is buffered for STA at AP",
|
|
"No data buffered"
|
|
};
|
|
|
|
static const true_false_string wep_flags = {
|
|
"WEP is enabled",
|
|
"WEP is disabled"
|
|
};
|
|
|
|
static const true_false_string order_flags = {
|
|
"Strictly ordered",
|
|
"Not strictly ordered"
|
|
};
|
|
|
|
static const true_false_string cf_ess_flags = {
|
|
"Transmitter is an AP",
|
|
"Transmitter is a STA"
|
|
};
|
|
|
|
|
|
static const true_false_string cf_privacy_flags = {
|
|
"AP/STA can support WEP",
|
|
"AP/STA cannot support WEP"
|
|
};
|
|
|
|
static const true_false_string cf_preamble_flags = {
|
|
"Short preamble allowed",
|
|
"Short preamble not allowed"
|
|
};
|
|
|
|
static const true_false_string cf_pbcc_flags = {
|
|
"PBCC modulation allowed",
|
|
"PBCC modulation not allowed"
|
|
};
|
|
|
|
static const true_false_string cf_agility_flags = {
|
|
"Channel agility in use",
|
|
"Channel agility not in use"
|
|
};
|
|
|
|
static const true_false_string short_slot_time_flags = {
|
|
"Short slot time in use",
|
|
"Short slot time not in use"
|
|
};
|
|
|
|
static const true_false_string dsss_ofdm_flags = {
|
|
"DSSS-OFDM modulation allowed",
|
|
"DSSS-OFDM modulation not allowed"
|
|
};
|
|
|
|
|
|
static const true_false_string cf_ibss_flags = {
|
|
"Transmitter belongs to an IBSS",
|
|
"Transmitter belongs to a BSS"
|
|
};
|
|
|
|
static const value_string sta_cf_pollable[] = {
|
|
{0x00, "Station is not CF-Pollable"},
|
|
{0x02, "Station is CF-Pollable, "
|
|
"not requesting to be placed on the CF-polling list"},
|
|
{0x01, "Station is CF-Pollable, "
|
|
"requesting to be placed on the CF-polling list"},
|
|
{0x03, "Station is CF-Pollable, requesting never to be polled"},
|
|
{0, NULL}
|
|
};
|
|
|
|
static const value_string ap_cf_pollable[] = {
|
|
{0x00, "No point coordinator at AP"},
|
|
{0x02, "Point coordinator at AP for delivery only (no polling)"},
|
|
{0x01, "Point coordinator at AP for delivery and polling"},
|
|
{0x03, "Reserved"},
|
|
{0, NULL}
|
|
};
|
|
|
|
|
|
static const value_string auth_alg[] = {
|
|
{0x00, "Open System"},
|
|
{0x01, "Shared key"},
|
|
{0, NULL}
|
|
};
|
|
|
|
static const value_string reason_codes[] = {
|
|
{0x00, "Reserved"},
|
|
{0x01, "Unspecified reason"},
|
|
{0x02, "Previous authentication no longer valid"},
|
|
{0x03, "Deauthenticated because sending STA is leaving (has left) "
|
|
"IBSS or ESS"},
|
|
{0x04, "Disassociated due to inactivity"},
|
|
{0x05, "Disassociated because AP is unable to handle all currently "
|
|
"associated stations"},
|
|
{0x06, "Class 2 frame received from nonauthenticated station"},
|
|
{0x07, "Class 3 frame received from nonassociated station"},
|
|
{0x08, "Disassociated because sending STA is leaving (has left) BSS"},
|
|
{0x09, "Station requesting (re)association is not authenticated with "
|
|
"responding station"},
|
|
{0x0D, "Invalid Information Element"},
|
|
{0x0E, "Michael MIC failure"},
|
|
{0x0F, "4-Way Handshake timeout"},
|
|
{0x10, "Group key update timeout"},
|
|
{0x11, "Information element in 4-Way Handshake different from "
|
|
"(Re)Association Request/Probe Response/Beacon"},
|
|
{0x12, "Group Cipher is not valid"},
|
|
{0x13, "Pairwise Cipher is not valid"},
|
|
{0x14, "AKMP is not valid"},
|
|
{0x15, "Unsupported RSN IE version"},
|
|
{0x16, "Invalid RSN IE Capabilities"},
|
|
{0x17, "IEEE 802.1X Authentication failed"},
|
|
{0x18, "Cipher suite is rejected per security policy"},
|
|
{0x00, NULL}
|
|
};
|
|
|
|
|
|
static const value_string status_codes[] = {
|
|
{0x00, "Successful"},
|
|
{0x01, "Unspecified failure"},
|
|
{0x0A, "Cannot support all requested capabilities in the "
|
|
"Capability information field"},
|
|
{0x0B, "Reassociation denied due to inability to confirm that "
|
|
"association exists"},
|
|
{0x0C, "Association denied due to reason outside the scope of this "
|
|
"standard"},
|
|
|
|
{0x0D, "Responding station does not support the specified authentication "
|
|
"algorithm"},
|
|
{0x0E, "Received an Authentication frame with authentication sequence "
|
|
"transaction sequence number out of expected sequence"},
|
|
{0x0F, "Authentication rejected because of challenge failure"},
|
|
{0x10, "Authentication rejected due to timeout waiting for next "
|
|
"frame in sequence"},
|
|
{0x11, "Association denied because AP is unable to handle additional "
|
|
"associated stations"},
|
|
{0x12, "Association denied due to requesting station not supporting all "
|
|
"of the datarates in the BSSBasicServiceSet Parameter"},
|
|
{0x13, "Association denied due to requesting station not supporting "
|
|
"short preamble operation"},
|
|
{0x14, "Association denied due to requesting station not supporting "
|
|
"PBCC encoding"},
|
|
{0x15, "Association denied due to requesting station not supporting "
|
|
"channel agility"},
|
|
{0x19, "Association denied due to requesting station not supporting "
|
|
"short slot operation"},
|
|
{0x1A, "Association denied due to requesting station not supporting "
|
|
"DSSS-OFDM operation"},
|
|
{0x28, "Invalid Information Element"},
|
|
{0x29, "Group Cipher is not valid"},
|
|
{0x2A, "Pairwise Cipher is not valid"},
|
|
{0x2B, "AKMP is not valid"},
|
|
{0x2C, "Unsupported RSN IE version"},
|
|
{0x2D, "Invalid RSN IE Capabilities"},
|
|
{0x2E, "Cipher suite is rejected per security policy"},
|
|
{0x00, NULL}
|
|
};
|
|
|
|
static const value_string category_codes[] = {
|
|
{0x11, "Management notification frame"},
|
|
{0x00, NULL}
|
|
};
|
|
|
|
static const value_string action_codes[] = {
|
|
{0x00, NULL}
|
|
};
|
|
|
|
static const value_string wme_action_codes[] = {
|
|
{0x00, "Setup request"},
|
|
{0x01, "Setup response"},
|
|
{0x02, "Teardown"},
|
|
{0x00, NULL}
|
|
};
|
|
|
|
static const value_string wme_status_codes[] = {
|
|
{0x00, "Admission accepted"},
|
|
{0x01, "Invalid parameters"},
|
|
{0x03, "Refused"},
|
|
{0x00, NULL}
|
|
};
|
|
|
|
static hf_register_info hf[] = {
|
|
{&hf_data_rate,
|
|
{"Data Rate", "wlan.data_rate", FT_UINT8, BASE_DEC, NULL, 0,
|
|
"Data rate (.5 Mb/s units)", HFILL }},
|
|
|
|
{&hf_channel,
|
|
{"Channel", "wlan.channel", FT_UINT8, BASE_DEC, NULL, 0,
|
|
"Radio channel", HFILL }},
|
|
|
|
{&hf_signal_strength,
|
|
{"Signal Strength", "wlan.signal_strength", FT_UINT8, BASE_DEC, NULL, 0,
|
|
"Signal strength (percentage)", HFILL }},
|
|
|
|
{&hf_fc_field,
|
|
{"Frame Control Field", "wlan.fc", FT_UINT16, BASE_HEX, NULL, 0,
|
|
"MAC Frame control", HFILL }},
|
|
|
|
{&hf_fc_proto_version,
|
|
{"Version", "wlan.fc.version", FT_UINT8, BASE_DEC, NULL, 0,
|
|
"MAC Protocol version", HFILL }}, /* 0 */
|
|
|
|
{&hf_fc_frame_type,
|
|
{"Type", "wlan.fc.type", FT_UINT8, BASE_DEC, VALS(frame_type), 0,
|
|
"Frame type", HFILL }},
|
|
|
|
{&hf_fc_frame_subtype,
|
|
{"Subtype", "wlan.fc.subtype", FT_UINT8, BASE_DEC, NULL, 0,
|
|
"Frame subtype", HFILL }}, /* 2 */
|
|
|
|
{&hf_fc_frame_type_subtype,
|
|
{"Type/Subtype", "wlan.fc.type_subtype", FT_UINT16, BASE_DEC, VALS(frame_type_subtype_vals), 0,
|
|
"Type and subtype combined", HFILL }},
|
|
|
|
{&hf_fc_flags,
|
|
{"Protocol Flags", "wlan.flags", FT_UINT8, BASE_HEX, NULL, 0,
|
|
"Protocol flags", HFILL }},
|
|
|
|
{&hf_fc_data_ds,
|
|
{"DS status", "wlan.fc.ds", FT_UINT8, BASE_HEX, VALS (&tofrom_ds), 0,
|
|
"Data-frame DS-traversal status", HFILL }}, /* 3 */
|
|
|
|
{&hf_fc_to_ds,
|
|
{"To DS", "wlan.fc.tods", FT_BOOLEAN, 8, TFS (&tods_flag), FLAG_TO_DS,
|
|
"To DS flag", HFILL }}, /* 4 */
|
|
|
|
{&hf_fc_from_ds,
|
|
{"From DS", "wlan.fc.fromds", FT_BOOLEAN, 8, TFS (&fromds_flag), FLAG_FROM_DS,
|
|
"From DS flag", HFILL }}, /* 5 */
|
|
|
|
{&hf_fc_more_frag,
|
|
{"More Fragments", "wlan.fc.frag", FT_BOOLEAN, 8, TFS (&more_frags), FLAG_MORE_FRAGMENTS,
|
|
"More Fragments flag", HFILL }}, /* 6 */
|
|
|
|
{&hf_fc_retry,
|
|
{"Retry", "wlan.fc.retry", FT_BOOLEAN, 8, TFS (&retry_flags), FLAG_RETRY,
|
|
"Retransmission flag", HFILL }},
|
|
|
|
{&hf_fc_pwr_mgt,
|
|
{"PWR MGT", "wlan.fc.pwrmgt", FT_BOOLEAN, 8, TFS (&pm_flags), FLAG_POWER_MGT,
|
|
"Power management status", HFILL }},
|
|
|
|
{&hf_fc_more_data,
|
|
{"More Data", "wlan.fc.moredata", FT_BOOLEAN, 8, TFS (&md_flags), FLAG_MORE_DATA,
|
|
"More data flag", HFILL }},
|
|
|
|
{&hf_fc_wep,
|
|
{"WEP flag", "wlan.fc.wep", FT_BOOLEAN, 8, TFS (&wep_flags), FLAG_WEP,
|
|
"WEP flag", HFILL }},
|
|
|
|
{&hf_fc_order,
|
|
{"Order flag", "wlan.fc.order", FT_BOOLEAN, 8, TFS (&order_flags), FLAG_ORDER,
|
|
"Strictly ordered flag", HFILL }},
|
|
|
|
{&hf_assoc_id,
|
|
{"Association ID","wlan.aid",FT_UINT16, BASE_DEC,NULL,0,
|
|
"Association-ID field", HFILL }},
|
|
|
|
{&hf_did_duration,
|
|
{"Duration", "wlan.duration", FT_UINT16, BASE_DEC, NULL, 0,
|
|
"Duration field", HFILL }},
|
|
|
|
{&hf_addr_da,
|
|
{"Destination address", "wlan.da", FT_ETHER, BASE_NONE, NULL, 0,
|
|
"Destination Hardware Address", HFILL }},
|
|
|
|
{&hf_addr_sa,
|
|
{"Source address", "wlan.sa", FT_ETHER, BASE_NONE, NULL, 0,
|
|
"Source Hardware Address", HFILL }},
|
|
|
|
{ &hf_addr,
|
|
{"Source or Destination address", "wlan.addr", FT_ETHER, BASE_NONE, NULL, 0,
|
|
"Source or Destination Hardware Address", HFILL }},
|
|
|
|
{&hf_addr_ra,
|
|
{"Receiver address", "wlan.ra", FT_ETHER, BASE_NONE, NULL, 0,
|
|
"Receiving Station Hardware Address", HFILL }},
|
|
|
|
{&hf_addr_ta,
|
|
{"Transmitter address", "wlan.ta", FT_ETHER, BASE_NONE, NULL, 0,
|
|
"Transmitting Station Hardware Address", HFILL }},
|
|
|
|
{&hf_addr_bssid,
|
|
{"BSS Id", "wlan.bssid", FT_ETHER, BASE_NONE, NULL, 0,
|
|
"Basic Service Set ID", HFILL }},
|
|
|
|
{&hf_frag_number,
|
|
{"Fragment number", "wlan.frag", FT_UINT16, BASE_DEC, NULL, 0,
|
|
"Fragment number", HFILL }},
|
|
|
|
{&hf_seq_number,
|
|
{"Sequence number", "wlan.seq", FT_UINT16, BASE_DEC, NULL, 0,
|
|
"Sequence number", HFILL }},
|
|
|
|
{&hf_qos_priority,
|
|
{"Priority", "wlan.qos.priority", FT_UINT16, BASE_DEC, NULL, 0,
|
|
"802.1D Tag", HFILL }},
|
|
|
|
{&hf_qos_ack_policy,
|
|
{"Ack Policy", "wlan.qos.ack", FT_UINT16, BASE_DEC, NULL, 0,
|
|
"Ack Policy", HFILL }},
|
|
|
|
{&hf_fcs,
|
|
{"Frame check sequence", "wlan.fcs", FT_UINT32, BASE_HEX,
|
|
NULL, 0, "FCS", HFILL }},
|
|
|
|
{&hf_fragment_overlap,
|
|
{"Fragment overlap", "wlan.fragment.overlap", FT_BOOLEAN, BASE_NONE,
|
|
NULL, 0x0, "Fragment overlaps with other fragments", HFILL }},
|
|
|
|
{&hf_fragment_overlap_conflict,
|
|
{"Conflicting data in fragment overlap", "wlan.fragment.overlap.conflict",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Overlapping fragments contained conflicting data", HFILL }},
|
|
|
|
{&hf_fragment_multiple_tails,
|
|
{"Multiple tail fragments found", "wlan.fragment.multipletails",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Several tails were found when defragmenting the packet", HFILL }},
|
|
|
|
{&hf_fragment_too_long_fragment,
|
|
{"Fragment too long", "wlan.fragment.toolongfragment",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Fragment contained data past end of packet", HFILL }},
|
|
|
|
{&hf_fragment_error,
|
|
{"Defragmentation error", "wlan.fragment.error",
|
|
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"Defragmentation error due to illegal fragments", HFILL }},
|
|
|
|
{&hf_fragment,
|
|
{"802.11 Fragment", "wlan.fragment", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"802.11 Fragment", HFILL }},
|
|
|
|
{&hf_fragments,
|
|
{"802.11 Fragments", "wlan.fragments", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"802.11 Fragments", HFILL }},
|
|
|
|
{&hf_reassembled_in,
|
|
{"Reassembled 802.11 in frame", "wlan.reassembled_in", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"This 802.11 packet is reassembled in this frame", HFILL }},
|
|
|
|
{&hf_wep_iv,
|
|
{"Initialization Vector", "wlan.wep.iv", FT_UINT24, BASE_HEX, NULL, 0,
|
|
"Initialization Vector", HFILL }},
|
|
|
|
{&hf_tkip_extiv,
|
|
{"TKIP Ext. Initialization Vector", "wlan.tkip.extiv", FT_STRING,
|
|
BASE_HEX, NULL, 0, "TKIP Extended Initialization Vector", HFILL }},
|
|
|
|
{&hf_ccmp_extiv,
|
|
{"CCMP Ext. Initialization Vector", "wlan.ccmp.extiv", FT_STRING,
|
|
BASE_HEX, NULL, 0, "CCMP Extended Initialization Vector", HFILL }},
|
|
|
|
{&hf_wep_key,
|
|
{"Key", "wlan.wep.key", FT_UINT8, BASE_DEC, NULL, 0,
|
|
"Key", HFILL }},
|
|
|
|
{&hf_wep_icv,
|
|
{"WEP ICV", "wlan.wep.icv", FT_UINT32, BASE_HEX, NULL, 0,
|
|
"WEP ICV", HFILL }},
|
|
};
|
|
|
|
static const true_false_string rsn_preauth_flags = {
|
|
"Transmitter supports pre-authentication",
|
|
"Transmitter does not support pre-authentication"
|
|
};
|
|
|
|
static const true_false_string rsn_no_pairwise_flags = {
|
|
"Transmitter cannot support WEP default key 0 simultaneously with "
|
|
"Pairwise key",
|
|
"Transmitter can support WEP default key 0 simultaneously with "
|
|
"Pairwise key"
|
|
};
|
|
|
|
static const value_string rsn_cap_replay_counter[] = {
|
|
{0x00, "1 replay counter per PTKSA/GTKSA/STAKeySA"},
|
|
{0x01, "2 replay counters per PTKSA/GTKSA/STAKeySA"},
|
|
{0x02, "4 replay counters per PTKSA/GTKSA/STAKeySA"},
|
|
{0x03, "16 replay counters per PTKSA/GTKSA/STAKeySA"},
|
|
{0, NULL}
|
|
};
|
|
|
|
static hf_register_info ff[] = {
|
|
{&ff_timestamp,
|
|
{"Timestamp", "wlan_mgt.fixed.timestamp", FT_STRING, BASE_NONE,
|
|
NULL, 0, "", HFILL }},
|
|
|
|
{&ff_auth_alg,
|
|
{"Authentication Algorithm", "wlan_mgt.fixed.auth.alg",
|
|
FT_UINT16, BASE_DEC, VALS (&auth_alg), 0, "", HFILL }},
|
|
|
|
{&ff_beacon_interval,
|
|
{"Beacon Interval", "wlan_mgt.fixed.beacon", FT_DOUBLE, BASE_DEC, NULL, 0,
|
|
"", HFILL }},
|
|
|
|
{&hf_fixed_parameters,
|
|
{"Fixed parameters", "wlan_mgt.fixed.all", FT_UINT16, BASE_DEC, NULL, 0,
|
|
"", HFILL }},
|
|
|
|
{&hf_tagged_parameters,
|
|
{"Tagged parameters", "wlan_mgt.tagged.all", FT_UINT16, BASE_DEC, NULL, 0,
|
|
"", HFILL }},
|
|
|
|
{&ff_capture,
|
|
{"Capabilities", "wlan_mgt.fixed.capabilities", FT_UINT16, BASE_HEX, NULL, 0,
|
|
"Capability information", HFILL }},
|
|
|
|
{&ff_cf_ess,
|
|
{"ESS capabilities", "wlan_mgt.fixed.capabilities.ess",
|
|
FT_BOOLEAN, 16, TFS (&cf_ess_flags), 0x0001, "ESS capabilities", HFILL }},
|
|
|
|
{&ff_cf_ibss,
|
|
{"IBSS status", "wlan_mgt.fixed.capabilities.ibss",
|
|
FT_BOOLEAN, 16, TFS (&cf_ibss_flags), 0x0002, "IBSS participation", HFILL }},
|
|
|
|
{&ff_cf_sta_poll,
|
|
{"CFP participation capabilities", "wlan_mgt.fixed.capabilities.cfpoll.sta",
|
|
FT_UINT16, BASE_HEX, VALS (&sta_cf_pollable), 0x000C,
|
|
"CF-Poll capabilities for a STA", HFILL }},
|
|
|
|
{&ff_cf_ap_poll,
|
|
{"CFP participation capabilities", "wlan_mgt.fixed.capabilities.cfpoll.ap",
|
|
FT_UINT16, BASE_HEX, VALS (&ap_cf_pollable), 0x000C,
|
|
"CF-Poll capabilities for an AP", HFILL }},
|
|
|
|
{&ff_cf_privacy,
|
|
{"Privacy", "wlan_mgt.fixed.capabilities.privacy",
|
|
FT_BOOLEAN, 16, TFS (&cf_privacy_flags), 0x0010, "WEP support", HFILL }},
|
|
|
|
{&ff_cf_preamble,
|
|
{"Short Preamble", "wlan_mgt.fixed.capabilities.preamble",
|
|
FT_BOOLEAN, 16, TFS (&cf_preamble_flags), 0x0020, "Short Preamble", HFILL }},
|
|
|
|
{&ff_cf_pbcc,
|
|
{"PBCC", "wlan_mgt.fixed.capabilities.pbcc",
|
|
FT_BOOLEAN, 16, TFS (&cf_pbcc_flags), 0x0040, "PBCC Modulation", HFILL }},
|
|
|
|
{&ff_cf_agility,
|
|
{"Channel Agility", "wlan_mgt.fixed.capabilities.agility",
|
|
FT_BOOLEAN, 16, TFS (&cf_agility_flags), 0x0080, "Channel Agility", HFILL }},
|
|
|
|
{&ff_short_slot_time,
|
|
{"Short Slot Time", "wlan_mgt.fixed.capabilities.short_slot_time",
|
|
FT_BOOLEAN, 16, TFS (&short_slot_time_flags), 0x0400, "Short Slot Time",
|
|
HFILL }},
|
|
|
|
{&ff_dsss_ofdm,
|
|
{"DSSS-OFDM", "wlan_mgt.fixed.capabilities.dsss_ofdm",
|
|
FT_BOOLEAN, 16, TFS (&dsss_ofdm_flags), 0x2000, "DSSS-OFDM Modulation",
|
|
HFILL }},
|
|
|
|
{&ff_auth_seq,
|
|
{"Authentication SEQ", "wlan_mgt.fixed.auth_seq",
|
|
FT_UINT16, BASE_HEX, NULL, 0, "Authentication sequence number", HFILL }},
|
|
|
|
{&ff_assoc_id,
|
|
{"Association ID", "wlan_mgt.fixed.aid",
|
|
FT_UINT16, BASE_HEX, NULL, 0, "Association ID", HFILL }},
|
|
|
|
{&ff_listen_ival,
|
|
{"Listen Interval", "wlan_mgt.fixed.listen_ival",
|
|
FT_UINT16, BASE_HEX, NULL, 0, "Listen Interval", HFILL }},
|
|
|
|
{&ff_current_ap,
|
|
{"Current AP", "wlan_mgt.fixed.current_ap",
|
|
FT_ETHER, BASE_NONE, NULL, 0, "MAC address of current AP", HFILL }},
|
|
|
|
{&ff_reason,
|
|
{"Reason code", "wlan_mgt.fixed.reason_code",
|
|
FT_UINT16, BASE_HEX, VALS (&reason_codes), 0,
|
|
"Reason for unsolicited notification", HFILL }},
|
|
|
|
{&ff_status_code,
|
|
{"Status code", "wlan_mgt.fixed.status_code",
|
|
FT_UINT16, BASE_HEX, VALS (&status_codes), 0,
|
|
"Status of requested event", HFILL }},
|
|
|
|
{&ff_category_code,
|
|
{"Category code", "wlan_mgt.fixed.category_code",
|
|
FT_UINT16, BASE_HEX, VALS (&category_codes), 0,
|
|
"Management action category", HFILL }},
|
|
|
|
{&ff_action_code,
|
|
{"Action code", "wlan_mgt.fixed.action_code",
|
|
FT_UINT16, BASE_HEX, VALS (&action_codes), 0,
|
|
"Management action code", HFILL }},
|
|
|
|
{&ff_dialog_token,
|
|
{"Dialog token", "wlan_mgt.fixed.dialog_token",
|
|
FT_UINT16, BASE_HEX, NULL, 0, "Management action dialog token", HFILL }},
|
|
|
|
{&ff_wme_action_code,
|
|
{"Action code", "wlan_mgt.fixed.action_code",
|
|
FT_UINT16, BASE_HEX, VALS (&wme_action_codes), 0,
|
|
"Management notification action code", HFILL }},
|
|
|
|
{&ff_wme_status_code,
|
|
{"Status code", "wlan_mgt.fixed.status_code",
|
|
FT_UINT16, BASE_HEX, VALS (&wme_status_codes), 0,
|
|
"Management notification setup response status code", HFILL }},
|
|
|
|
{&tag_number,
|
|
{"Tag", "wlan_mgt.tag.number",
|
|
FT_UINT8, BASE_DEC, VALS(tag_num_vals), 0,
|
|
"Element ID", HFILL }},
|
|
|
|
{&tag_length,
|
|
{"Tag length", "wlan_mgt.tag.length",
|
|
FT_UINT8, BASE_DEC, NULL, 0, "Length of tag", HFILL }},
|
|
|
|
{&tag_interpretation,
|
|
{"Tag interpretation", "wlan_mgt.tag.interpretation",
|
|
FT_STRING, BASE_NONE, NULL, 0, "Interpretation of tag", HFILL }},
|
|
|
|
{&rsn_cap,
|
|
{"RSN Capabilities", "wlan_mgt.rsn.capabilities", FT_UINT16, BASE_HEX,
|
|
NULL, 0, "RSN Capability information", HFILL }},
|
|
|
|
{&rsn_cap_preauth,
|
|
{"RSN Pre-Auth capabilities", "wlan_mgt.rsn.capabilities.preauth",
|
|
FT_BOOLEAN, 16, TFS (&rsn_preauth_flags), 0x0001,
|
|
"RSN Pre-Auth capabilities", HFILL }},
|
|
|
|
{&rsn_cap_no_pairwise,
|
|
{"RSN No Pairwise capabilities", "wlan_mgt.rsn.capabilities.no_pairwise",
|
|
FT_BOOLEAN, 16, TFS (&rsn_no_pairwise_flags), 0x0002,
|
|
"RSN No Pairwise capabilities", HFILL }},
|
|
|
|
{&rsn_cap_ptksa_replay_counter,
|
|
{"RSN PTKSA Replay Counter capabilities",
|
|
"wlan_mgt.rsn.capabilities.ptksa_replay_counter",
|
|
FT_UINT16, BASE_HEX, VALS (&rsn_cap_replay_counter), 0x000C,
|
|
"RSN PTKSA Replay Counter capabilities", HFILL }},
|
|
|
|
{&rsn_cap_gtksa_replay_counter,
|
|
{"RSN GTKSA Replay Counter capabilities",
|
|
"wlan_mgt.rsn.capabilities.gtksa_replay_counter",
|
|
FT_UINT16, BASE_HEX, VALS (&rsn_cap_replay_counter), 0x0030,
|
|
"RSN GTKSA Replay Counter capabilities", HFILL }},
|
|
};
|
|
|
|
static gint *tree_array[] = {
|
|
&ett_80211,
|
|
&ett_fc_tree,
|
|
&ett_proto_flags,
|
|
&ett_fragments,
|
|
&ett_fragment,
|
|
&ett_80211_mgt,
|
|
&ett_fixed_parameters,
|
|
&ett_tagged_parameters,
|
|
&ett_qos_parameters,
|
|
&ett_wep_parameters,
|
|
&ett_cap_tree,
|
|
&ett_rsn_cap_tree,
|
|
};
|
|
module_t *wlan_module;
|
|
|
|
static const enum_val_t wep_keys_options[] = {
|
|
{"0", "0", 0},
|
|
{"1", "1", 1},
|
|
{"2", "2", 2},
|
|
{"3", "3", 3},
|
|
{"4", "4", 4},
|
|
{NULL, NULL, -1},
|
|
};
|
|
|
|
|
|
proto_wlan = proto_register_protocol ("IEEE 802.11 wireless LAN",
|
|
"IEEE 802.11", "wlan");
|
|
proto_register_field_array (proto_wlan, hf, array_length (hf));
|
|
proto_wlan_mgt = proto_register_protocol ("IEEE 802.11 wireless LAN management frame",
|
|
"802.11 MGT", "wlan_mgt");
|
|
proto_register_field_array (proto_wlan_mgt, ff, array_length (ff));
|
|
proto_register_subtree_array (tree_array, array_length (tree_array));
|
|
|
|
register_dissector("wlan", dissect_ieee80211, proto_wlan);
|
|
register_dissector("wlan_fixed", dissect_ieee80211_fixed, proto_wlan);
|
|
register_dissector("wlan_bsfc", dissect_ieee80211_bsfc, proto_wlan);
|
|
register_init_routine(wlan_defragment_init);
|
|
|
|
/* Register configuration options */
|
|
wlan_module = prefs_register_protocol(proto_wlan, init_wepkeys);
|
|
prefs_register_bool_preference(wlan_module, "defragment",
|
|
"Reassemble fragmented 802.11 datagrams",
|
|
"Whether fragmented 802.11 datagrams should be reassembled",
|
|
&wlan_defragment);
|
|
|
|
prefs_register_bool_preference(wlan_module, "check_fcs",
|
|
"Assume packets have FCS",
|
|
"Some 802.11 cards include the FCS at the end of a packet, others do not.",
|
|
&wlan_check_fcs);
|
|
|
|
prefs_register_bool_preference(wlan_module, "ignore_wep",
|
|
"Ignore the WEP bit",
|
|
"Some 802.11 cards leave the WEP bit set even though the packet is decrypted.",
|
|
&wlan_ignore_wep);
|
|
|
|
#ifndef USE_ENV
|
|
prefs_register_enum_preference(wlan_module, "wep_keys",
|
|
"WEP key count",
|
|
"How many WEP keys do we have to choose from? (0 to disable, up to 4)",
|
|
&num_wepkeys, wep_keys_options, FALSE);
|
|
|
|
prefs_register_string_preference(wlan_module, "wep_key1",
|
|
"WEP key #1",
|
|
"First WEP key (A:B:C:D:E) [40bit], (A:B:C:D:E:F:G:H:I:J:K:L:M) [104bit], or whatever key length you're using",
|
|
&wep_keystr[0]);
|
|
prefs_register_string_preference(wlan_module, "wep_key2",
|
|
"WEP key #2",
|
|
"Second WEP key (A:B:C:D:E) [40bit], (A:B:C:D:E:F:G:H:I:J:K:L:M) [104bit], or whatever key length you're using",
|
|
&wep_keystr[1]);
|
|
prefs_register_string_preference(wlan_module, "wep_key3",
|
|
"WEP key #3",
|
|
"Third WEP key (A:B:C:D:E) [40bit], (A:B:C:D:E:F:G:H:I:J:K:L:M) [104bit], or whatever key length you're using",
|
|
&wep_keystr[2]);
|
|
prefs_register_string_preference(wlan_module, "wep_key4",
|
|
"WEP key #4",
|
|
"Fourth WEP key (A:B:C:D:E) [40bit] (A:B:C:D:E:F:G:H:I:J:K:L:M) [104bit], or whatever key length you're using",
|
|
&wep_keystr[3]);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_ieee80211(void)
|
|
{
|
|
dissector_handle_t ieee80211_handle;
|
|
dissector_handle_t ieee80211_radio_handle;
|
|
|
|
/*
|
|
* Get handles for the LLC, IPX and Ethernet dissectors.
|
|
*/
|
|
llc_handle = find_dissector("llc");
|
|
ipx_handle = find_dissector("ipx");
|
|
eth_handle = find_dissector("eth");
|
|
data_handle = find_dissector("data");
|
|
|
|
ieee80211_handle = find_dissector("wlan");
|
|
dissector_add("wtap_encap", WTAP_ENCAP_IEEE_802_11, ieee80211_handle);
|
|
ieee80211_radio_handle = create_dissector_handle(dissect_ieee80211_radio,
|
|
proto_wlan);
|
|
dissector_add("wtap_encap", WTAP_ENCAP_IEEE_802_11_WITH_RADIO,
|
|
ieee80211_radio_handle);
|
|
dissector_add("ethertype", ETHERTYPE_CENTRINO_PROMISC, ieee80211_handle);
|
|
}
|
|
|
|
static tvbuff_t *try_decrypt_wep(tvbuff_t *tvb, guint32 offset, guint32 len) {
|
|
const guint8 *enc_data;
|
|
guint8 *tmp = NULL;
|
|
int i;
|
|
tvbuff_t *decr_tvb = NULL;
|
|
|
|
if (num_wepkeys < 1)
|
|
return NULL;
|
|
|
|
enc_data = tvb_get_ptr(tvb, offset, len);
|
|
|
|
if ((tmp = g_malloc(len)) == NULL)
|
|
return NULL; /* krap! */
|
|
|
|
/* try once with the key index in the packet, then look through our list. */
|
|
for (i = -1; i < (int) num_wepkeys; i++) {
|
|
/* copy the encrypted data over to the tmp buffer */
|
|
#if 0
|
|
printf("trying %d\n", i);
|
|
#endif
|
|
memcpy(tmp, enc_data, len);
|
|
if (wep_decrypt(tmp, len, i) == 0) {
|
|
|
|
/* decrypt successful, let's set up a new data tvb. */
|
|
decr_tvb = tvb_new_real_data(tmp, len-8, len-8);
|
|
tvb_set_free_cb(decr_tvb, g_free);
|
|
tvb_set_child_real_data_tvbuff(tvb, decr_tvb);
|
|
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
done:
|
|
if ((!decr_tvb) && (tmp)) g_free(tmp);
|
|
|
|
#if 0
|
|
printf("de-wep %p\n", decr_tvb);
|
|
#endif
|
|
|
|
return decr_tvb;
|
|
}
|
|
|
|
|
|
/* de-weps the block. if successful, buf* will point to the data start. */
|
|
static int wep_decrypt(guint8 *buf, guint32 len, int key_override) {
|
|
guint32 i, j, k, crc, keylen;
|
|
guint8 s[256], key[128], c_crc[4];
|
|
guint8 keyidx, *dpos, *cpos;
|
|
|
|
/* Needs to be at least 8 bytes of payload */
|
|
if (len < 8)
|
|
return -1;
|
|
|
|
/* initialize the first bytes of the key from the IV */
|
|
key[0] = buf[0];
|
|
key[1] = buf[1];
|
|
key[2] = buf[2];
|
|
keyidx = COOK_WEP_KEY(buf[3]);
|
|
|
|
if (key_override >= 0)
|
|
keyidx = key_override;
|
|
|
|
if (keyidx >= num_wepkeys)
|
|
return -1;
|
|
|
|
keylen = wep_keylens[keyidx];
|
|
|
|
if (keylen == 0)
|
|
return -1;
|
|
if (wep_keys[keyidx] == NULL)
|
|
return -1;
|
|
|
|
keylen+=3; /* add in ICV bytes */
|
|
|
|
/* copy the rest of the key over from the designated key */
|
|
memcpy(key+3, wep_keys[keyidx], wep_keylens[keyidx]);
|
|
|
|
#if 0
|
|
printf("%d: %02x %02x %02x (%d %d) %02x:%02x:%02x:%02x:%02x\n", len, key[0], key[1], key[2], keyidx, keylen, key[3], key[4], key[5], key[6], key[7]);
|
|
#endif
|
|
|
|
/* set up the RC4 state */
|
|
for (i = 0; i < 256; i++)
|
|
s[i] = i;
|
|
j = 0;
|
|
for (i = 0; i < 256; i++) {
|
|
j = (j + s[i] + key[i % keylen]) & 0xff;
|
|
SSWAP(i,j);
|
|
}
|
|
|
|
/* Apply the RC4 to the data, update the CRC32 */
|
|
cpos = buf+4;
|
|
dpos = buf;
|
|
crc = ~0;
|
|
i = j = 0;
|
|
for (k = 0; k < (len -8); k++) {
|
|
i = (i+1) & 0xff;
|
|
j = (j+s[i]) & 0xff;
|
|
SSWAP(i,j);
|
|
#if 0
|
|
printf("%d -- %02x ", k, *dpos);
|
|
#endif
|
|
*dpos = *cpos++ ^ s[(s[i] + s[j]) & 0xff];
|
|
#if 0
|
|
printf("%02x\n", *dpos);
|
|
#endif
|
|
crc = crc32_ccitt_table[(crc ^ *dpos++) & 0xff] ^ (crc >> 8);
|
|
}
|
|
crc = ~crc;
|
|
|
|
/* now let's check the crc */
|
|
c_crc[0] = crc;
|
|
c_crc[1] = crc >> 8;
|
|
c_crc[2] = crc >> 16;
|
|
c_crc[3] = crc >> 24;
|
|
|
|
for (k = 0; k < 4; k++) {
|
|
i = (i + 1) & 0xff;
|
|
j = (j+s[i]) & 0xff;
|
|
SSWAP(i,j);
|
|
#if 0
|
|
printf("-- %02x %02x\n", *dpos, c_crc[k]);
|
|
#endif
|
|
if ((*cpos++ ^ s[(s[i] + s[j]) & 0xff]) != c_crc[k])
|
|
return -1; /* ICV mismatch */
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void init_wepkeys(void) {
|
|
char *tmp;
|
|
guint i;
|
|
GByteArray *bytes;
|
|
gboolean res;
|
|
|
|
#ifdef USE_ENV
|
|
guint8 buf[128];
|
|
|
|
tmp = getenv("ETHEREAL_WEPKEYNUM");
|
|
if (!tmp) {
|
|
num_wepkeys = 0;
|
|
return;
|
|
}
|
|
num_wepkeys = atoi(tmp);
|
|
#else
|
|
if (num_wepkeys > 4)
|
|
num_wepkeys = 4;
|
|
#endif
|
|
|
|
if (num_wepkeys < 1)
|
|
return;
|
|
|
|
if (wep_keys)
|
|
g_free(wep_keys);
|
|
|
|
if (wep_keylens)
|
|
g_free(wep_keylens);
|
|
|
|
wep_keys = g_malloc(num_wepkeys * sizeof(guint8*));
|
|
wep_keylens = g_malloc(num_wepkeys * sizeof(int));
|
|
bytes = g_byte_array_new();
|
|
|
|
for (i = 0 ; i < num_wepkeys; i++) {
|
|
wep_keys[i] = NULL;
|
|
wep_keylens[i] = 0;
|
|
|
|
#ifdef USE_ENV
|
|
sprintf(buf, "ETHEREAL_WEPKEY%d", i+1);
|
|
tmp = getenv(buf);
|
|
#else
|
|
tmp = wep_keystr[i];
|
|
#endif
|
|
|
|
if (tmp) {
|
|
#if 0
|
|
#ifdef USE_ENV
|
|
printf("%s -- %s\n", buf, tmp);
|
|
#else
|
|
printf("%d -- %s\n", i+1, tmp);
|
|
#endif
|
|
#endif
|
|
|
|
if (wep_keys[i]) {
|
|
g_free(wep_keys[i]);
|
|
}
|
|
|
|
res = hex_str_to_bytes(tmp, bytes, FALSE);
|
|
if (res && bytes->len > 0) {
|
|
if (bytes->len > 32) {
|
|
bytes->len = 32;
|
|
}
|
|
wep_keys[i] = g_malloc(32 * sizeof(guint8));
|
|
memset(wep_keys[i], 0, 32 * sizeof(guint8));
|
|
memcpy(wep_keys[i], bytes->data, bytes->len * sizeof(guint8));
|
|
wep_keylens[i] = bytes->len;
|
|
#if 0
|
|
printf("%d: %d bytes\n", i, bytes->len);
|
|
printf("%d: %s\n", i, bytes_to_str(bytes->data, bytes->len));
|
|
#endif
|
|
} else {
|
|
#if 0
|
|
printf("res: %d bytes->len: %d\n", res, bytes->len);
|
|
#endif
|
|
g_warning("Could not parse WEP key %d: %s", i + 1, tmp);
|
|
}
|
|
}
|
|
}
|
|
g_byte_array_free(bytes, TRUE);
|
|
}
|