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//------------------------------------------------------------------------------
// <copyright file="wlan_recv_beacon.c" company="Atheros">
// Copyright (c) 2004-2008 Atheros Corporation. All rights reserved.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation;
//
// Software distributed under the License is distributed on an "AS
// IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
// implied. See the License for the specific language governing
// rights and limitations under the License.
//
//
//------------------------------------------------------------------------------
//==============================================================================
// IEEE 802.11 input handling.
//
// Author(s): ="Atheros"
//==============================================================================
#include "a_config.h"
#include "athdefs.h"
#include "a_types.h"
#include "a_osapi.h"
#include <wmi.h>
#include <ieee80211.h>
#include <wlan_api.h>
#define IEEE80211_VERIFY_LENGTH(_len, _minlen) do { \
if ((_len) < (_minlen)) { \
return A_EINVAL; \
} \
} while (0)
#define IEEE80211_VERIFY_ELEMENT(__elem, __maxlen) do { \
if ((__elem) == NULL) { \
return A_EINVAL; \
} \
if ((__elem)[1] > (__maxlen)) { \
return A_EINVAL; \
} \
} while (0)
/* unaligned little endian access */
#define LE_READ_2(p) \
((A_UINT16) \
((((A_UINT8 *)(p))[0] ) | (((A_UINT8 *)(p))[1] << 8)))
#define LE_READ_4(p) \
((A_UINT32) \
((((A_UINT8 *)(p))[0] ) | (((A_UINT8 *)(p))[1] << 8) | \
(((A_UINT8 *)(p))[2] << 16) | (((A_UINT8 *)(p))[3] << 24)))
static int __inline
iswpaoui(const A_UINT8 *frm)
{
return frm[1] > 3 && LE_READ_4(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI);
}
static int __inline
iswmmoui(const A_UINT8 *frm)
{
return frm[1] > 3 && LE_READ_4(frm+2) == ((WMM_OUI_TYPE<<24)|WMM_OUI);
}
/* unused functions for now */
#if 0
static int __inline
iswmmparam(const A_UINT8 *frm)
{
return frm[1] > 5 && frm[6] == WMM_PARAM_OUI_SUBTYPE;
}
static int __inline
iswmminfo(const A_UINT8 *frm)
{
return frm[1] > 5 && frm[6] == WMM_INFO_OUI_SUBTYPE;
}
#endif
static int __inline
isatherosoui(const A_UINT8 *frm)
{
return frm[1] > 3 && LE_READ_4(frm+2) == ((ATH_OUI_TYPE<<24)|ATH_OUI);
}
static int __inline
iswscoui(const A_UINT8 *frm)
{
return frm[1] > 3 && LE_READ_4(frm+2) == ((0x04<<24)|WPA_OUI);
}
A_STATUS
wlan_parse_beacon(A_UINT8 *buf, int framelen, struct ieee80211_common_ie *cie)
{
A_UINT8 *frm, *efrm;
A_UINT8 elemid_ssid = FALSE;
frm = buf;
efrm = (A_UINT8 *) (frm + framelen);
/*
* beacon/probe response frame format
* [8] time stamp
* [2] beacon interval
* [2] capability information
* [tlv] ssid
* [tlv] supported rates
* [tlv] country information
* [tlv] parameter set (FH/DS)
* [tlv] erp information
* [tlv] extended supported rates
* [tlv] WMM
* [tlv] WPA or RSN
* [tlv] Atheros Advanced Capabilities
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 12);
A_MEMZERO(cie, sizeof(*cie));
cie->ie_tstamp = frm; frm += 8;
cie->ie_beaconInt = A_LE2CPU16(*(A_UINT16 *)frm); frm += 2;
cie->ie_capInfo = A_LE2CPU16(*(A_UINT16 *)frm); frm += 2;
cie->ie_chan = 0;
while (frm < efrm) {
switch (*frm) {
case IEEE80211_ELEMID_SSID:
if (!elemid_ssid) {
cie->ie_ssid = frm;
elemid_ssid = TRUE;
}
break;
case IEEE80211_ELEMID_RATES:
cie->ie_rates = frm;
break;
case IEEE80211_ELEMID_COUNTRY:
cie->ie_country = frm;
break;
case IEEE80211_ELEMID_FHPARMS:
break;
case IEEE80211_ELEMID_DSPARMS:
cie->ie_chan = frm[2];
break;
case IEEE80211_ELEMID_TIM:
cie->ie_tim = frm;
break;
case IEEE80211_ELEMID_IBSSPARMS:
break;
case IEEE80211_ELEMID_XRATES:
cie->ie_xrates = frm;
break;
case IEEE80211_ELEMID_ERP:
if (frm[1] != 1) {
//A_PRINTF("Discarding ERP Element - Bad Len\n");
return A_EINVAL;
}
cie->ie_erp = frm[2];
break;
case IEEE80211_ELEMID_RSN:
cie->ie_rsn = frm;
break;
case IEEE80211_ELEMID_HTCAP_ANA:
cie->ie_htcap = frm;
break;
case IEEE80211_ELEMID_HTINFO_ANA:
cie->ie_htop = frm;
break;
#ifdef WAPI_ENABLE
case IEEE80211_ELEMID_WAPI:
cie->ie_wapi = frm;
break;
#endif
case IEEE80211_ELEMID_VENDOR:
if (iswpaoui(frm)) {
cie->ie_wpa = frm;
} else if (iswmmoui(frm)) {
cie->ie_wmm = frm;
} else if (isatherosoui(frm)) {
cie->ie_ath = frm;
} else if(iswscoui(frm)) {
cie->ie_wsc = frm;
}
break;
default:
break;
}
frm += frm[1] + 2;
}
IEEE80211_VERIFY_ELEMENT(cie->ie_rates, IEEE80211_RATE_MAXSIZE);
IEEE80211_VERIFY_ELEMENT(cie->ie_ssid, IEEE80211_NWID_LEN);
return A_OK;
}
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