target/linux/s3c24xx/files-2.6.30/drivers/ar6000/wlan/wlan_recv_beacon.c

   1 /*-
   2  * Copyright (c) 2001 Atsushi Onoe
   3  * Copyright (c) 2002-2004 Sam Leffler, Errno Consulting
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * Alternatively, this software may be distributed under the terms of the
  18  * GNU General Public License ("GPL") version 2 as published by the Free
  19  * Software Foundation.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32 /*
  33  * IEEE 802.11 input handling.
  34  */
  35
  36 #include "a_config.h"
  37 #include "athdefs.h"
  38 #include "a_types.h"
  39 #include "a_osapi.h"
  40 #include <wmi.h>
  41 #include <ieee80211.h>
  42 #include <wlan_api.h>
  43
  44 #define IEEE80211_VERIFY_LENGTH(_len, _minlen) do {         \
  45     if ((_len) < (_minlen)) {                   \
  46         return A_EINVAL;                         \
  47     }                               \
  48 } while (0)
  49
  50 #define IEEE80211_VERIFY_ELEMENT(__elem, __maxlen) do {         \
  51     if ((__elem) == NULL) {                     \
  52         return A_EINVAL;                         \
  53     }                               \
  54     if ((__elem)[1] > (__maxlen)) {                 \
  55         return A_EINVAL;                         \
  56     }                               \
  57 } while (0)
  58
  59
  60 /* unaligned little endian access */
  61 #define LE_READ_2(p)                            \
  62     ((A_UINT16)                            \
  63      ((((A_UINT8 *)(p))[0]      ) | (((A_UINT8 *)(p))[1] <<  8)))
  64
  65 #define LE_READ_4(p)                            \
  66     ((A_UINT32)                            \
  67      ((((A_UINT8 *)(p))[0]      ) | (((A_UINT8 *)(p))[1] <<  8) | \
  68       (((A_UINT8 *)(p))[2] << 16) | (((A_UINT8 *)(p))[3] << 24)))
  69
  70
  71 static int __inline
  72 iswpaoui(const A_UINT8 *frm)
  73 {
  74     return frm[1] > 3 && LE_READ_4(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI);
  75 }
  76
  77 static int __inline
  78 iswmmoui(const A_UINT8 *frm)
  79 {
  80     return frm[1] > 3 && LE_READ_4(frm+2) == ((WMM_OUI_TYPE<<24)|WMM_OUI);
  81 }
  82
  83 static int __inline
  84 iswmmparam(const A_UINT8 *frm)
  85 {
  86     return frm[1] > 5 && frm[6] == WMM_PARAM_OUI_SUBTYPE;
  87 }
  88
  89 static int __inline
  90 iswmminfo(const A_UINT8 *frm)
  91 {
  92     return frm[1] > 5 && frm[6] == WMM_INFO_OUI_SUBTYPE;
  93 }
  94
  95 static int __inline
  96 isatherosoui(const A_UINT8 *frm)
  97 {
  98     return frm[1] > 3 && LE_READ_4(frm+2) == ((ATH_OUI_TYPE<<24)|ATH_OUI);
  99 }
 100
 101 static int __inline
 102 iswscoui(const A_UINT8 *frm)
 103 {
 104     return frm[1] > 3 && LE_READ_4(frm+2) == ((0x04<<24)|WPA_OUI);
 105 }
 106
 107 A_STATUS
 108 wlan_parse_beacon(A_UINT8 *buf, int framelen, struct ieee80211_common_ie *cie)
 109 {
 110     A_UINT8 *frm, *efrm;
 111
 112     frm = buf;
 113     efrm = (A_UINT8 *) (frm + framelen);
 114
 115     /*
 116      * beacon/probe response frame format
 117      *  [8] time stamp
 118      *  [2] beacon interval
 119      *  [2] capability information
 120      *  [tlv] ssid
 121      *  [tlv] supported rates
 122      *  [tlv] country information
 123      *  [tlv] parameter set (FH/DS)
 124      *  [tlv] erp information
 125      *  [tlv] extended supported rates
 126      *  [tlv] WMM
 127      *  [tlv] WPA or RSN
 128      *  [tlv] Atheros Advanced Capabilities
 129      */
 130     IEEE80211_VERIFY_LENGTH(efrm - frm, 12);
 131     A_MEMZERO(cie, sizeof(*cie));
 132
 133     cie->ie_tstamp = frm; frm += 8;
 134     cie->ie_beaconInt = A_LE2CPU16(*(A_UINT16 *)frm);  frm += 2;
 135     cie->ie_capInfo = A_LE2CPU16(*(A_UINT16 *)frm);  frm += 2;
 136     cie->ie_chan = 0;
 137
 138     while (frm < efrm) {
 139         switch (*frm) {
 140         case IEEE80211_ELEMID_SSID:
 141             cie->ie_ssid = frm;
 142             break;
 143         case IEEE80211_ELEMID_RATES:
 144             cie->ie_rates = frm;
 145             break;
 146         case IEEE80211_ELEMID_COUNTRY:
 147             cie->ie_country = frm;
 148             break;
 149         case IEEE80211_ELEMID_FHPARMS:
 150             break;
 151         case IEEE80211_ELEMID_DSPARMS:
 152             cie->ie_chan = frm[2];
 153             break;
 154         case IEEE80211_ELEMID_TIM:
 155             cie->ie_tim = frm;
 156             break;
 157         case IEEE80211_ELEMID_IBSSPARMS:
 158             break;
 159         case IEEE80211_ELEMID_XRATES:
 160             cie->ie_xrates = frm;
 161             break;
 162         case IEEE80211_ELEMID_ERP:
 163             if (frm[1] != 1) {
 164                 //A_PRINTF("Discarding ERP Element - Bad Len\n");
 165                 return A_EINVAL;
 166             }
 167             cie->ie_erp = frm[2];
 168             break;
 169         case IEEE80211_ELEMID_RSN:
 170             cie->ie_rsn = frm;
 171             break;
 172         case IEEE80211_ELEMID_VENDOR:
 173             if (iswpaoui(frm)) {
 174                 cie->ie_wpa = frm;
 175             } else if (iswmmoui(frm)) {
 176                 cie->ie_wmm = frm;
 177             } else if (isatherosoui(frm)) {
 178                 cie->ie_ath = frm;
 179             } else if(iswscoui(frm)) {
 180                 cie->ie_wsc = frm;
 181             }
 182             break;
 183         default:
 184             break;
 185         }
 186         frm += frm[1] + 2;
 187     }
 188     IEEE80211_VERIFY_ELEMENT(cie->ie_rates, IEEE80211_RATE_MAXSIZE);
 189     IEEE80211_VERIFY_ELEMENT(cie->ie_ssid, IEEE80211_NWID_LEN);
 190
 191     return A_OK;
 192 }