| //------------------------------------------------------------------------------ |
| // <copyright file="wlan_recv_beacon.c" company="Atheros"> |
| // Copyright (c) 2004-2010 Atheros Corporation. All rights reserved. |
| // |
| // |
| // Permission to use, copy, modify, and/or distribute this software for any |
| // purpose with or without fee is hereby granted, provided that the above |
| // copyright notice and this permission notice appear in all copies. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| // ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| // OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| // |
| // |
| //------------------------------------------------------------------------------ |
| //============================================================================== |
| // 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; |
| } |
