// SPDX-License-Identifier: GPL-2.0
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/******************************************************************************
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* ieee80211.c
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*
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* Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
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* Linux device driver for RTL8192SU
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*
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* Modifications for inclusion into the Linux staging tree are
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* Copyright(c) 2010 Larry Finger. All rights reserved.
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*
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* Contact information:
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* WLAN FAE <wlanfae@realtek.com>.
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* Larry Finger <Larry.Finger@lwfinger.net>
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*
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******************************************************************************/
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#define _IEEE80211_C
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#include "drv_types.h"
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#include "ieee80211.h"
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#include "wifi.h"
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#include "osdep_service.h"
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#include "wlan_bssdef.h"
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static const u8 WPA_OUI_TYPE[] = {0x00, 0x50, 0xf2, 1};
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static const u8 WPA_CIPHER_SUITE_NONE[] = {0x00, 0x50, 0xf2, 0};
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static const u8 WPA_CIPHER_SUITE_WEP40[] = {0x00, 0x50, 0xf2, 1};
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static const u8 WPA_CIPHER_SUITE_TKIP[] = {0x00, 0x50, 0xf2, 2};
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static const u8 WPA_CIPHER_SUITE_CCMP[] = {0x00, 0x50, 0xf2, 4};
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static const u8 WPA_CIPHER_SUITE_WEP104[] = {0x00, 0x50, 0xf2, 5};
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static const u8 RSN_CIPHER_SUITE_NONE[] = {0x00, 0x0f, 0xac, 0};
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static const u8 RSN_CIPHER_SUITE_WEP40[] = {0x00, 0x0f, 0xac, 1};
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static const u8 RSN_CIPHER_SUITE_TKIP[] = {0x00, 0x0f, 0xac, 2};
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static const u8 RSN_CIPHER_SUITE_CCMP[] = {0x00, 0x0f, 0xac, 4};
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static const u8 RSN_CIPHER_SUITE_WEP104[] = {0x00, 0x0f, 0xac, 5};
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/*-----------------------------------------------------------
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* for adhoc-master to generate ie and provide supported-rate to fw
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*-----------------------------------------------------------
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*/
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static u8 WIFI_CCKRATES[] = {
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(IEEE80211_CCK_RATE_1MB | IEEE80211_BASIC_RATE_MASK),
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(IEEE80211_CCK_RATE_2MB | IEEE80211_BASIC_RATE_MASK),
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(IEEE80211_CCK_RATE_5MB | IEEE80211_BASIC_RATE_MASK),
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(IEEE80211_CCK_RATE_11MB | IEEE80211_BASIC_RATE_MASK)
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};
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static u8 WIFI_OFDMRATES[] = {
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(IEEE80211_OFDM_RATE_6MB),
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(IEEE80211_OFDM_RATE_9MB),
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(IEEE80211_OFDM_RATE_12MB),
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(IEEE80211_OFDM_RATE_18MB),
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(IEEE80211_OFDM_RATE_24MB),
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(IEEE80211_OFDM_RATE_36MB),
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(IEEE80211_OFDM_RATE_48MB),
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(IEEE80211_OFDM_RATE_54MB)
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};
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uint r8712_is_cckrates_included(u8 *rate)
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{
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u32 i = 0;
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while (rate[i] != 0) {
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if ((((rate[i]) & 0x7f) == 2) || (((rate[i]) & 0x7f) == 4) ||
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(((rate[i]) & 0x7f) == 11) || (((rate[i]) & 0x7f) == 22))
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return true;
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i++;
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}
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return false;
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}
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uint r8712_is_cckratesonly_included(u8 *rate)
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{
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u32 i = 0;
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while (rate[i] != 0) {
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if ((((rate[i]) & 0x7f) != 2) && (((rate[i]) & 0x7f) != 4) &&
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(((rate[i]) & 0x7f) != 11) && (((rate[i]) & 0x7f) != 22))
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return false;
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i++;
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}
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return true;
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}
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/* r8712_set_ie will update frame length */
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u8 *r8712_set_ie(u8 *pbuf, sint index, uint len, u8 *source, uint *frlen)
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{
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*pbuf = (u8)index;
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*(pbuf + 1) = (u8)len;
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if (len > 0)
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memcpy((void *)(pbuf + 2), (void *)source, len);
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*frlen = *frlen + (len + 2);
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return pbuf + len + 2;
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}
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/* ---------------------------------------------------------------------------
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* index: the information element id index, limit is the limit for search
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* ---------------------------------------------------------------------------
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*/
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u8 *r8712_get_ie(u8 *pbuf, sint index, uint *len, sint limit)
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{
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sint tmp, i;
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u8 *p;
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if (limit < 1)
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return NULL;
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p = pbuf;
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i = 0;
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*len = 0;
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while (1) {
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if (*p == index) {
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*len = *(p + 1);
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return p;
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}
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tmp = *(p + 1);
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p += (tmp + 2);
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i += (tmp + 2);
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if (i >= limit)
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break;
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}
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return NULL;
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}
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static void set_supported_rate(u8 *rates, uint mode)
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{
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memset(rates, 0, NDIS_802_11_LENGTH_RATES_EX);
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switch (mode) {
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case WIRELESS_11B:
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memcpy(rates, WIFI_CCKRATES, IEEE80211_CCK_RATE_LEN);
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break;
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case WIRELESS_11G:
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case WIRELESS_11A:
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memcpy(rates, WIFI_OFDMRATES, IEEE80211_NUM_OFDM_RATESLEN);
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break;
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case WIRELESS_11BG:
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memcpy(rates, WIFI_CCKRATES, IEEE80211_CCK_RATE_LEN);
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memcpy(rates + IEEE80211_CCK_RATE_LEN, WIFI_OFDMRATES,
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IEEE80211_NUM_OFDM_RATESLEN);
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break;
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}
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}
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static uint r8712_get_rateset_len(u8 *rateset)
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{
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uint i = 0;
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while (1) {
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if ((rateset[i]) == 0)
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break;
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if (i > 12)
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break;
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i++;
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}
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return i;
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}
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int r8712_generate_ie(struct registry_priv *registrypriv)
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{
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int rate_len;
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uint sz = 0;
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struct wlan_bssid_ex *dev_network = ®istrypriv->dev_network;
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u8 *ie = dev_network->IEs;
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u16 beaconPeriod = (u16)dev_network->Configuration.BeaconPeriod;
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/*timestamp will be inserted by hardware*/
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sz += 8;
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ie += sz;
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/*beacon interval : 2bytes*/
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*(__le16 *)ie = cpu_to_le16(beaconPeriod);
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sz += 2;
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ie += 2;
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/*capability info*/
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*(u16 *)ie = 0;
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*(__le16 *)ie |= cpu_to_le16(cap_IBSS);
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if (registrypriv->preamble == PREAMBLE_SHORT)
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*(__le16 *)ie |= cpu_to_le16(cap_ShortPremble);
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if (dev_network->Privacy)
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*(__le16 *)ie |= cpu_to_le16(cap_Privacy);
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sz += 2;
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ie += 2;
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/*SSID*/
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ie = r8712_set_ie(ie, WLAN_EID_SSID, dev_network->Ssid.SsidLength,
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dev_network->Ssid.Ssid, &sz);
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/*supported rates*/
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set_supported_rate(dev_network->rates, registrypriv->wireless_mode);
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rate_len = r8712_get_rateset_len(dev_network->rates);
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if (rate_len > 8) {
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ie = r8712_set_ie(ie, WLAN_EID_SUPP_RATES, 8,
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dev_network->rates, &sz);
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ie = r8712_set_ie(ie, WLAN_EID_EXT_SUPP_RATES, (rate_len - 8),
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(dev_network->rates + 8), &sz);
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} else {
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ie = r8712_set_ie(ie, WLAN_EID_SUPP_RATES,
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rate_len, dev_network->rates, &sz);
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}
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/*DS parameter set*/
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ie = r8712_set_ie(ie, WLAN_EID_DS_PARAMS, 1,
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(u8 *)&dev_network->Configuration.DSConfig, &sz);
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/*IBSS Parameter Set*/
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ie = r8712_set_ie(ie, WLAN_EID_IBSS_PARAMS, 2,
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(u8 *)&dev_network->Configuration.ATIMWindow, &sz);
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return sz;
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}
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unsigned char *r8712_get_wpa_ie(unsigned char *ie, uint *wpa_ie_len, int limit)
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{
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u32 len;
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u16 val16;
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unsigned char wpa_oui_type[] = {0x00, 0x50, 0xf2, 0x01};
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u8 *buf = ie;
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while (1) {
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buf = r8712_get_ie(buf, _WPA_IE_ID_, &len, limit);
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if (buf) {
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/*check if oui matches...*/
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if (memcmp((buf + 2), wpa_oui_type,
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sizeof(wpa_oui_type)))
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goto check_next_ie;
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/*check version...*/
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memcpy((u8 *)&val16, (buf + 6), sizeof(val16));
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le16_to_cpus(&val16);
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if (val16 != 0x0001)
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goto check_next_ie;
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*wpa_ie_len = *(buf + 1);
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return buf;
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}
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*wpa_ie_len = 0;
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return NULL;
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check_next_ie:
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limit = limit - (buf - ie) - 2 - len;
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if (limit <= 0)
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break;
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buf += (2 + len);
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}
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*wpa_ie_len = 0;
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return NULL;
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}
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unsigned char *r8712_get_wpa2_ie(unsigned char *pie, uint *rsn_ie_len,
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int limit)
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{
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return r8712_get_ie(pie, _WPA2_IE_ID_, rsn_ie_len, limit);
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}
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static int r8712_get_wpa_cipher_suite(u8 *s)
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{
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if (!memcmp(s, (void *)WPA_CIPHER_SUITE_NONE, WPA_SELECTOR_LEN))
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return WPA_CIPHER_NONE;
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if (!memcmp(s, (void *)WPA_CIPHER_SUITE_WEP40, WPA_SELECTOR_LEN))
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return WPA_CIPHER_WEP40;
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if (!memcmp(s, (void *)WPA_CIPHER_SUITE_TKIP, WPA_SELECTOR_LEN))
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return WPA_CIPHER_TKIP;
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if (!memcmp(s, (void *)WPA_CIPHER_SUITE_CCMP, WPA_SELECTOR_LEN))
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return WPA_CIPHER_CCMP;
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if (!memcmp(s, (void *)WPA_CIPHER_SUITE_WEP104, WPA_SELECTOR_LEN))
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return WPA_CIPHER_WEP104;
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return 0;
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}
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static int r8712_get_wpa2_cipher_suite(u8 *s)
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{
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if (!memcmp(s, (void *)RSN_CIPHER_SUITE_NONE, RSN_SELECTOR_LEN))
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return WPA_CIPHER_NONE;
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if (!memcmp(s, (void *)RSN_CIPHER_SUITE_WEP40, RSN_SELECTOR_LEN))
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return WPA_CIPHER_WEP40;
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if (!memcmp(s, (void *)RSN_CIPHER_SUITE_TKIP, RSN_SELECTOR_LEN))
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return WPA_CIPHER_TKIP;
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if (!memcmp(s, (void *)RSN_CIPHER_SUITE_CCMP, RSN_SELECTOR_LEN))
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return WPA_CIPHER_CCMP;
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if (!memcmp(s, (void *)RSN_CIPHER_SUITE_WEP104, RSN_SELECTOR_LEN))
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return WPA_CIPHER_WEP104;
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return 0;
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}
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int r8712_parse_wpa_ie(u8 *wpa_ie, int wpa_ie_len, int *group_cipher,
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int *pairwise_cipher)
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{
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int i;
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int left, count;
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u8 *pos;
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if (wpa_ie_len <= 0) {
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/* No WPA IE - fail silently */
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return -EINVAL;
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}
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if ((*wpa_ie != _WPA_IE_ID_) ||
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(*(wpa_ie + 1) != (u8)(wpa_ie_len - 2)) ||
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(memcmp(wpa_ie + 2, (void *)WPA_OUI_TYPE, WPA_SELECTOR_LEN)))
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return -EINVAL;
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pos = wpa_ie;
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pos += 8;
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left = wpa_ie_len - 8;
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/*group_cipher*/
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if (left >= WPA_SELECTOR_LEN) {
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*group_cipher = r8712_get_wpa_cipher_suite(pos);
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pos += WPA_SELECTOR_LEN;
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left -= WPA_SELECTOR_LEN;
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} else if (left > 0) {
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return -EINVAL;
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}
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/*pairwise_cipher*/
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if (left >= 2) {
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count = le16_to_cpu(*(__le16 *)pos);
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pos += 2;
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left -= 2;
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if (count == 0 || left < count * WPA_SELECTOR_LEN)
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return -EINVAL;
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for (i = 0; i < count; i++) {
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*pairwise_cipher |= r8712_get_wpa_cipher_suite(pos);
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pos += WPA_SELECTOR_LEN;
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left -= WPA_SELECTOR_LEN;
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}
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} else if (left == 1) {
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return -EINVAL;
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}
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return 0;
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}
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int r8712_parse_wpa2_ie(u8 *rsn_ie, int rsn_ie_len, int *group_cipher,
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int *pairwise_cipher)
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{
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int i;
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int left, count;
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u8 *pos;
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if (rsn_ie_len <= 0) {
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/* No RSN IE - fail silently */
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return -EINVAL;
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}
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if ((*rsn_ie != _WPA2_IE_ID_) ||
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(*(rsn_ie + 1) != (u8)(rsn_ie_len - 2)))
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return -EINVAL;
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pos = rsn_ie;
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pos += 4;
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left = rsn_ie_len - 4;
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/*group_cipher*/
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if (left >= RSN_SELECTOR_LEN) {
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*group_cipher = r8712_get_wpa2_cipher_suite(pos);
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pos += RSN_SELECTOR_LEN;
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left -= RSN_SELECTOR_LEN;
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} else if (left > 0) {
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return -EINVAL;
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}
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/*pairwise_cipher*/
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if (left >= 2) {
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count = le16_to_cpu(*(__le16 *)pos);
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pos += 2;
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left -= 2;
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if (count == 0 || left < count * RSN_SELECTOR_LEN)
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return -EINVAL;
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for (i = 0; i < count; i++) {
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*pairwise_cipher |= r8712_get_wpa2_cipher_suite(pos);
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pos += RSN_SELECTOR_LEN;
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left -= RSN_SELECTOR_LEN;
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}
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} else if (left == 1) {
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return -EINVAL;
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}
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return 0;
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}
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int r8712_get_sec_ie(u8 *in_ie, uint in_len, u8 *rsn_ie, u16 *rsn_len,
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u8 *wpa_ie, u16 *wpa_len)
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{
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u8 authmode;
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u8 wpa_oui[4] = {0x0, 0x50, 0xf2, 0x01};
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uint cnt;
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/*Search required WPA or WPA2 IE and copy to sec_ie[ ]*/
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cnt = _TIMESTAMP_ + _BEACON_ITERVAL_ + _CAPABILITY_;
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while (cnt < in_len) {
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authmode = in_ie[cnt];
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if ((authmode == _WPA_IE_ID_) &&
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(!memcmp(&in_ie[cnt + 2], &wpa_oui[0], 4))) {
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memcpy(wpa_ie, &in_ie[cnt], in_ie[cnt + 1] + 2);
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*wpa_len = in_ie[cnt + 1] + 2;
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cnt += in_ie[cnt + 1] + 2; /*get next */
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} else {
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if (authmode == _WPA2_IE_ID_) {
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memcpy(rsn_ie, &in_ie[cnt],
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in_ie[cnt + 1] + 2);
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*rsn_len = in_ie[cnt + 1] + 2;
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cnt += in_ie[cnt + 1] + 2; /*get next*/
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} else {
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cnt += in_ie[cnt + 1] + 2; /*get next*/
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}
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}
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}
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return *rsn_len + *wpa_len;
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}
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int r8712_get_wps_ie(u8 *in_ie, uint in_len, u8 *wps_ie, uint *wps_ielen)
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{
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int match;
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uint cnt;
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u8 eid, wps_oui[4] = {0x0, 0x50, 0xf2, 0x04};
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cnt = 12;
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match = false;
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while (cnt < in_len) {
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eid = in_ie[cnt];
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if ((eid == _WPA_IE_ID_) &&
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(!memcmp(&in_ie[cnt + 2], wps_oui, 4))) {
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memcpy(wps_ie, &in_ie[cnt], in_ie[cnt + 1] + 2);
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*wps_ielen = in_ie[cnt + 1] + 2;
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cnt += in_ie[cnt + 1] + 2;
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match = true;
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break;
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}
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cnt += in_ie[cnt + 1] + 2; /* goto next */
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}
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return match;
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}
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