424 lines
11 KiB
C
424 lines
11 KiB
C
/*
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* Copyright (c) 2009 Atheros Communications Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Module for common driver code between ath9k and ath9k_htc
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "common.h"
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MODULE_AUTHOR("Atheros Communications");
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MODULE_DESCRIPTION("Shared library for Atheros wireless 802.11n LAN cards.");
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MODULE_LICENSE("Dual BSD/GPL");
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int ath9k_cmn_padpos(__le16 frame_control)
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{
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int padpos = 24;
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if (ieee80211_has_a4(frame_control)) {
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padpos += ETH_ALEN;
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}
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if (ieee80211_is_data_qos(frame_control)) {
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padpos += IEEE80211_QOS_CTL_LEN;
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}
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return padpos;
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}
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EXPORT_SYMBOL(ath9k_cmn_padpos);
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int ath9k_cmn_get_hw_crypto_keytype(struct sk_buff *skb)
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{
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struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
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if (tx_info->control.hw_key) {
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if (tx_info->control.hw_key->alg == ALG_WEP)
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return ATH9K_KEY_TYPE_WEP;
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else if (tx_info->control.hw_key->alg == ALG_TKIP)
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return ATH9K_KEY_TYPE_TKIP;
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else if (tx_info->control.hw_key->alg == ALG_CCMP)
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return ATH9K_KEY_TYPE_AES;
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}
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return ATH9K_KEY_TYPE_CLEAR;
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}
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EXPORT_SYMBOL(ath9k_cmn_get_hw_crypto_keytype);
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static u32 ath9k_get_extchanmode(struct ieee80211_channel *chan,
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enum nl80211_channel_type channel_type)
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{
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u32 chanmode = 0;
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switch (chan->band) {
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case IEEE80211_BAND_2GHZ:
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switch (channel_type) {
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case NL80211_CHAN_NO_HT:
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case NL80211_CHAN_HT20:
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chanmode = CHANNEL_G_HT20;
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break;
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case NL80211_CHAN_HT40PLUS:
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chanmode = CHANNEL_G_HT40PLUS;
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break;
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case NL80211_CHAN_HT40MINUS:
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chanmode = CHANNEL_G_HT40MINUS;
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break;
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}
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break;
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case IEEE80211_BAND_5GHZ:
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switch (channel_type) {
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case NL80211_CHAN_NO_HT:
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case NL80211_CHAN_HT20:
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chanmode = CHANNEL_A_HT20;
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break;
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case NL80211_CHAN_HT40PLUS:
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chanmode = CHANNEL_A_HT40PLUS;
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break;
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case NL80211_CHAN_HT40MINUS:
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chanmode = CHANNEL_A_HT40MINUS;
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break;
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}
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break;
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default:
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break;
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}
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return chanmode;
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}
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/*
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* Update internal channel flags.
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*/
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void ath9k_cmn_update_ichannel(struct ieee80211_hw *hw,
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struct ath9k_channel *ichan)
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{
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struct ieee80211_channel *chan = hw->conf.channel;
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struct ieee80211_conf *conf = &hw->conf;
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ichan->channel = chan->center_freq;
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ichan->chan = chan;
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if (chan->band == IEEE80211_BAND_2GHZ) {
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ichan->chanmode = CHANNEL_G;
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ichan->channelFlags = CHANNEL_2GHZ | CHANNEL_OFDM | CHANNEL_G;
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} else {
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ichan->chanmode = CHANNEL_A;
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ichan->channelFlags = CHANNEL_5GHZ | CHANNEL_OFDM;
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}
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if (conf_is_ht(conf))
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ichan->chanmode = ath9k_get_extchanmode(chan,
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conf->channel_type);
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}
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EXPORT_SYMBOL(ath9k_cmn_update_ichannel);
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/*
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* Get the internal channel reference.
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*/
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struct ath9k_channel *ath9k_cmn_get_curchannel(struct ieee80211_hw *hw,
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struct ath_hw *ah)
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{
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struct ieee80211_channel *curchan = hw->conf.channel;
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struct ath9k_channel *channel;
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u8 chan_idx;
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chan_idx = curchan->hw_value;
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channel = &ah->channels[chan_idx];
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ath9k_cmn_update_ichannel(hw, channel);
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return channel;
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}
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EXPORT_SYMBOL(ath9k_cmn_get_curchannel);
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static int ath_setkey_tkip(struct ath_common *common, u16 keyix, const u8 *key,
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struct ath9k_keyval *hk, const u8 *addr,
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bool authenticator)
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{
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struct ath_hw *ah = common->ah;
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const u8 *key_rxmic;
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const u8 *key_txmic;
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key_txmic = key + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
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key_rxmic = key + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;
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if (addr == NULL) {
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/*
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* Group key installation - only two key cache entries are used
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* regardless of splitmic capability since group key is only
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* used either for TX or RX.
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*/
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if (authenticator) {
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memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
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memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_mic));
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} else {
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memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
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memcpy(hk->kv_txmic, key_rxmic, sizeof(hk->kv_mic));
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}
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return ath9k_hw_set_keycache_entry(ah, keyix, hk, addr);
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}
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if (!common->splitmic) {
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/* TX and RX keys share the same key cache entry. */
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memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
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memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_txmic));
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return ath9k_hw_set_keycache_entry(ah, keyix, hk, addr);
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}
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/* Separate key cache entries for TX and RX */
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/* TX key goes at first index, RX key at +32. */
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memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
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if (!ath9k_hw_set_keycache_entry(ah, keyix, hk, NULL)) {
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/* TX MIC entry failed. No need to proceed further */
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ath_print(common, ATH_DBG_FATAL,
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"Setting TX MIC Key Failed\n");
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return 0;
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}
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memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
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/* XXX delete tx key on failure? */
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return ath9k_hw_set_keycache_entry(ah, keyix + 32, hk, addr);
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}
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static int ath_reserve_key_cache_slot_tkip(struct ath_common *common)
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{
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int i;
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for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) {
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if (test_bit(i, common->keymap) ||
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test_bit(i + 64, common->keymap))
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continue; /* At least one part of TKIP key allocated */
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if (common->splitmic &&
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(test_bit(i + 32, common->keymap) ||
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test_bit(i + 64 + 32, common->keymap)))
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continue; /* At least one part of TKIP key allocated */
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/* Found a free slot for a TKIP key */
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return i;
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}
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return -1;
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}
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static int ath_reserve_key_cache_slot(struct ath_common *common,
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enum ieee80211_key_alg alg)
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{
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int i;
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if (alg == ALG_TKIP)
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return ath_reserve_key_cache_slot_tkip(common);
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/* First, try to find slots that would not be available for TKIP. */
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if (common->splitmic) {
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for (i = IEEE80211_WEP_NKID; i < common->keymax / 4; i++) {
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if (!test_bit(i, common->keymap) &&
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(test_bit(i + 32, common->keymap) ||
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test_bit(i + 64, common->keymap) ||
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test_bit(i + 64 + 32, common->keymap)))
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return i;
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if (!test_bit(i + 32, common->keymap) &&
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(test_bit(i, common->keymap) ||
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test_bit(i + 64, common->keymap) ||
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test_bit(i + 64 + 32, common->keymap)))
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return i + 32;
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if (!test_bit(i + 64, common->keymap) &&
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(test_bit(i , common->keymap) ||
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test_bit(i + 32, common->keymap) ||
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test_bit(i + 64 + 32, common->keymap)))
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return i + 64;
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if (!test_bit(i + 64 + 32, common->keymap) &&
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(test_bit(i, common->keymap) ||
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test_bit(i + 32, common->keymap) ||
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test_bit(i + 64, common->keymap)))
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return i + 64 + 32;
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}
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} else {
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for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) {
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if (!test_bit(i, common->keymap) &&
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test_bit(i + 64, common->keymap))
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return i;
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if (test_bit(i, common->keymap) &&
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!test_bit(i + 64, common->keymap))
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return i + 64;
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}
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}
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/* No partially used TKIP slots, pick any available slot */
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for (i = IEEE80211_WEP_NKID; i < common->keymax; i++) {
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/* Do not allow slots that could be needed for TKIP group keys
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* to be used. This limitation could be removed if we know that
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* TKIP will not be used. */
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if (i >= 64 && i < 64 + IEEE80211_WEP_NKID)
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continue;
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if (common->splitmic) {
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if (i >= 32 && i < 32 + IEEE80211_WEP_NKID)
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continue;
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if (i >= 64 + 32 && i < 64 + 32 + IEEE80211_WEP_NKID)
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continue;
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}
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if (!test_bit(i, common->keymap))
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return i; /* Found a free slot for a key */
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}
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/* No free slot found */
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return -1;
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}
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/*
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* Configure encryption in the HW.
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*/
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int ath9k_cmn_key_config(struct ath_common *common,
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struct ieee80211_vif *vif,
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struct ieee80211_sta *sta,
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struct ieee80211_key_conf *key)
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{
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struct ath_hw *ah = common->ah;
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struct ath9k_keyval hk;
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const u8 *mac = NULL;
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u8 gmac[ETH_ALEN];
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int ret = 0;
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int idx;
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memset(&hk, 0, sizeof(hk));
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switch (key->alg) {
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case ALG_WEP:
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hk.kv_type = ATH9K_CIPHER_WEP;
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break;
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case ALG_TKIP:
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hk.kv_type = ATH9K_CIPHER_TKIP;
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break;
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case ALG_CCMP:
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hk.kv_type = ATH9K_CIPHER_AES_CCM;
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break;
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default:
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return -EOPNOTSUPP;
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}
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hk.kv_len = key->keylen;
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memcpy(hk.kv_val, key->key, key->keylen);
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if (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
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switch (vif->type) {
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case NL80211_IFTYPE_AP:
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memcpy(gmac, vif->addr, ETH_ALEN);
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gmac[0] |= 0x01;
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mac = gmac;
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idx = ath_reserve_key_cache_slot(common, key->alg);
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break;
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case NL80211_IFTYPE_ADHOC:
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memcpy(gmac, sta->addr, ETH_ALEN);
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gmac[0] |= 0x01;
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mac = gmac;
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idx = ath_reserve_key_cache_slot(common, key->alg);
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break;
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default:
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idx = key->keyidx;
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break;
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}
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} else if (key->keyidx) {
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if (WARN_ON(!sta))
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return -EOPNOTSUPP;
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mac = sta->addr;
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if (vif->type != NL80211_IFTYPE_AP) {
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/* Only keyidx 0 should be used with unicast key, but
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* allow this for client mode for now. */
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idx = key->keyidx;
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} else
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return -EIO;
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} else {
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if (WARN_ON(!sta))
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return -EOPNOTSUPP;
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mac = sta->addr;
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idx = ath_reserve_key_cache_slot(common, key->alg);
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}
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if (idx < 0)
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return -ENOSPC; /* no free key cache entries */
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if (key->alg == ALG_TKIP)
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ret = ath_setkey_tkip(common, idx, key->key, &hk, mac,
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vif->type == NL80211_IFTYPE_AP);
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else
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ret = ath9k_hw_set_keycache_entry(ah, idx, &hk, mac);
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if (!ret)
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return -EIO;
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set_bit(idx, common->keymap);
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if (key->alg == ALG_TKIP) {
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set_bit(idx + 64, common->keymap);
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if (common->splitmic) {
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set_bit(idx + 32, common->keymap);
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set_bit(idx + 64 + 32, common->keymap);
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}
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}
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return idx;
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}
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EXPORT_SYMBOL(ath9k_cmn_key_config);
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/*
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* Delete Key.
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*/
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void ath9k_cmn_key_delete(struct ath_common *common,
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struct ieee80211_key_conf *key)
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{
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struct ath_hw *ah = common->ah;
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ath9k_hw_keyreset(ah, key->hw_key_idx);
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if (key->hw_key_idx < IEEE80211_WEP_NKID)
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return;
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clear_bit(key->hw_key_idx, common->keymap);
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if (key->alg != ALG_TKIP)
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return;
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clear_bit(key->hw_key_idx + 64, common->keymap);
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if (common->splitmic) {
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ath9k_hw_keyreset(ah, key->hw_key_idx + 32);
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clear_bit(key->hw_key_idx + 32, common->keymap);
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clear_bit(key->hw_key_idx + 64 + 32, common->keymap);
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}
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}
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EXPORT_SYMBOL(ath9k_cmn_key_delete);
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int ath9k_cmn_count_streams(unsigned int chainmask, int max)
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{
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int streams = 0;
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do {
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if (++streams == max)
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break;
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} while ((chainmask = chainmask & (chainmask - 1)));
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return streams;
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}
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EXPORT_SYMBOL(ath9k_cmn_count_streams);
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static int __init ath9k_cmn_init(void)
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{
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return 0;
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}
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module_init(ath9k_cmn_init);
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static void __exit ath9k_cmn_exit(void)
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{
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return;
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}
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module_exit(ath9k_cmn_exit);
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