1 /* 2 * Copyright (c) 2009 Atheros Communications Inc. 3 * 4 * Permission to use, copy, modify, and/or distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16 17 /* 18 * Module for common driver code between ath9k and ath9k_htc 19 */ 20 21 #include <linux/kernel.h> 22 #include <linux/module.h> 23 24 #include "common.h" 25 26 MODULE_AUTHOR("Atheros Communications"); 27 MODULE_DESCRIPTION("Shared library for Atheros wireless 802.11n LAN cards."); 28 MODULE_LICENSE("Dual BSD/GPL"); 29 30 int ath9k_cmn_padpos(__le16 frame_control) 31 { 32 int padpos = 24; 33 if (ieee80211_has_a4(frame_control)) { 34 padpos += ETH_ALEN; 35 } 36 if (ieee80211_is_data_qos(frame_control)) { 37 padpos += IEEE80211_QOS_CTL_LEN; 38 } 39 40 return padpos; 41 } 42 EXPORT_SYMBOL(ath9k_cmn_padpos); 43 44 int ath9k_cmn_get_hw_crypto_keytype(struct sk_buff *skb) 45 { 46 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); 47 48 if (tx_info->control.hw_key) { 49 if (tx_info->control.hw_key->alg == ALG_WEP) 50 return ATH9K_KEY_TYPE_WEP; 51 else if (tx_info->control.hw_key->alg == ALG_TKIP) 52 return ATH9K_KEY_TYPE_TKIP; 53 else if (tx_info->control.hw_key->alg == ALG_CCMP) 54 return ATH9K_KEY_TYPE_AES; 55 } 56 57 return ATH9K_KEY_TYPE_CLEAR; 58 } 59 EXPORT_SYMBOL(ath9k_cmn_get_hw_crypto_keytype); 60 61 static u32 ath9k_get_extchanmode(struct ieee80211_channel *chan, 62 enum nl80211_channel_type channel_type) 63 { 64 u32 chanmode = 0; 65 66 switch (chan->band) { 67 case IEEE80211_BAND_2GHZ: 68 switch (channel_type) { 69 case NL80211_CHAN_NO_HT: 70 case NL80211_CHAN_HT20: 71 chanmode = CHANNEL_G_HT20; 72 break; 73 case NL80211_CHAN_HT40PLUS: 74 chanmode = CHANNEL_G_HT40PLUS; 75 break; 76 case NL80211_CHAN_HT40MINUS: 77 chanmode = CHANNEL_G_HT40MINUS; 78 break; 79 } 80 break; 81 case IEEE80211_BAND_5GHZ: 82 switch (channel_type) { 83 case NL80211_CHAN_NO_HT: 84 case NL80211_CHAN_HT20: 85 chanmode = CHANNEL_A_HT20; 86 break; 87 case NL80211_CHAN_HT40PLUS: 88 chanmode = CHANNEL_A_HT40PLUS; 89 break; 90 case NL80211_CHAN_HT40MINUS: 91 chanmode = CHANNEL_A_HT40MINUS; 92 break; 93 } 94 break; 95 default: 96 break; 97 } 98 99 return chanmode; 100 } 101 102 /* 103 * Update internal channel flags. 104 */ 105 void ath9k_cmn_update_ichannel(struct ieee80211_hw *hw, 106 struct ath9k_channel *ichan) 107 { 108 struct ieee80211_channel *chan = hw->conf.channel; 109 struct ieee80211_conf *conf = &hw->conf; 110 111 ichan->channel = chan->center_freq; 112 ichan->chan = chan; 113 114 if (chan->band == IEEE80211_BAND_2GHZ) { 115 ichan->chanmode = CHANNEL_G; 116 ichan->channelFlags = CHANNEL_2GHZ | CHANNEL_OFDM | CHANNEL_G; 117 } else { 118 ichan->chanmode = CHANNEL_A; 119 ichan->channelFlags = CHANNEL_5GHZ | CHANNEL_OFDM; 120 } 121 122 if (conf_is_ht(conf)) 123 ichan->chanmode = ath9k_get_extchanmode(chan, 124 conf->channel_type); 125 } 126 EXPORT_SYMBOL(ath9k_cmn_update_ichannel); 127 128 /* 129 * Get the internal channel reference. 130 */ 131 struct ath9k_channel *ath9k_cmn_get_curchannel(struct ieee80211_hw *hw, 132 struct ath_hw *ah) 133 { 134 struct ieee80211_channel *curchan = hw->conf.channel; 135 struct ath9k_channel *channel; 136 u8 chan_idx; 137 138 chan_idx = curchan->hw_value; 139 channel = &ah->channels[chan_idx]; 140 ath9k_cmn_update_ichannel(hw, channel); 141 142 return channel; 143 } 144 EXPORT_SYMBOL(ath9k_cmn_get_curchannel); 145 146 static int ath_setkey_tkip(struct ath_common *common, u16 keyix, const u8 *key, 147 struct ath9k_keyval *hk, const u8 *addr, 148 bool authenticator) 149 { 150 struct ath_hw *ah = common->ah; 151 const u8 *key_rxmic; 152 const u8 *key_txmic; 153 154 key_txmic = key + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY; 155 key_rxmic = key + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY; 156 157 if (addr == NULL) { 158 /* 159 * Group key installation - only two key cache entries are used 160 * regardless of splitmic capability since group key is only 161 * used either for TX or RX. 162 */ 163 if (authenticator) { 164 memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic)); 165 memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_mic)); 166 } else { 167 memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic)); 168 memcpy(hk->kv_txmic, key_rxmic, sizeof(hk->kv_mic)); 169 } 170 return ath9k_hw_set_keycache_entry(ah, keyix, hk, addr); 171 } 172 if (!common->splitmic) { 173 /* TX and RX keys share the same key cache entry. */ 174 memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic)); 175 memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_txmic)); 176 return ath9k_hw_set_keycache_entry(ah, keyix, hk, addr); 177 } 178 179 /* Separate key cache entries for TX and RX */ 180 181 /* TX key goes at first index, RX key at +32. */ 182 memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic)); 183 if (!ath9k_hw_set_keycache_entry(ah, keyix, hk, NULL)) { 184 /* TX MIC entry failed. No need to proceed further */ 185 ath_print(common, ATH_DBG_FATAL, 186 "Setting TX MIC Key Failed\n"); 187 return 0; 188 } 189 190 memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic)); 191 /* XXX delete tx key on failure? */ 192 return ath9k_hw_set_keycache_entry(ah, keyix + 32, hk, addr); 193 } 194 195 static int ath_reserve_key_cache_slot_tkip(struct ath_common *common) 196 { 197 int i; 198 199 for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) { 200 if (test_bit(i, common->keymap) || 201 test_bit(i + 64, common->keymap)) 202 continue; /* At least one part of TKIP key allocated */ 203 if (common->splitmic && 204 (test_bit(i + 32, common->keymap) || 205 test_bit(i + 64 + 32, common->keymap))) 206 continue; /* At least one part of TKIP key allocated */ 207 208 /* Found a free slot for a TKIP key */ 209 return i; 210 } 211 return -1; 212 } 213 214 static int ath_reserve_key_cache_slot(struct ath_common *common, 215 enum ieee80211_key_alg alg) 216 { 217 int i; 218 219 if (alg == ALG_TKIP) 220 return ath_reserve_key_cache_slot_tkip(common); 221 222 /* First, try to find slots that would not be available for TKIP. */ 223 if (common->splitmic) { 224 for (i = IEEE80211_WEP_NKID; i < common->keymax / 4; i++) { 225 if (!test_bit(i, common->keymap) && 226 (test_bit(i + 32, common->keymap) || 227 test_bit(i + 64, common->keymap) || 228 test_bit(i + 64 + 32, common->keymap))) 229 return i; 230 if (!test_bit(i + 32, common->keymap) && 231 (test_bit(i, common->keymap) || 232 test_bit(i + 64, common->keymap) || 233 test_bit(i + 64 + 32, common->keymap))) 234 return i + 32; 235 if (!test_bit(i + 64, common->keymap) && 236 (test_bit(i , common->keymap) || 237 test_bit(i + 32, common->keymap) || 238 test_bit(i + 64 + 32, common->keymap))) 239 return i + 64; 240 if (!test_bit(i + 64 + 32, common->keymap) && 241 (test_bit(i, common->keymap) || 242 test_bit(i + 32, common->keymap) || 243 test_bit(i + 64, common->keymap))) 244 return i + 64 + 32; 245 } 246 } else { 247 for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) { 248 if (!test_bit(i, common->keymap) && 249 test_bit(i + 64, common->keymap)) 250 return i; 251 if (test_bit(i, common->keymap) && 252 !test_bit(i + 64, common->keymap)) 253 return i + 64; 254 } 255 } 256 257 /* No partially used TKIP slots, pick any available slot */ 258 for (i = IEEE80211_WEP_NKID; i < common->keymax; i++) { 259 /* Do not allow slots that could be needed for TKIP group keys 260 * to be used. This limitation could be removed if we know that 261 * TKIP will not be used. */ 262 if (i >= 64 && i < 64 + IEEE80211_WEP_NKID) 263 continue; 264 if (common->splitmic) { 265 if (i >= 32 && i < 32 + IEEE80211_WEP_NKID) 266 continue; 267 if (i >= 64 + 32 && i < 64 + 32 + IEEE80211_WEP_NKID) 268 continue; 269 } 270 271 if (!test_bit(i, common->keymap)) 272 return i; /* Found a free slot for a key */ 273 } 274 275 /* No free slot found */ 276 return -1; 277 } 278 279 /* 280 * Configure encryption in the HW. 281 */ 282 int ath9k_cmn_key_config(struct ath_common *common, 283 struct ieee80211_vif *vif, 284 struct ieee80211_sta *sta, 285 struct ieee80211_key_conf *key) 286 { 287 struct ath_hw *ah = common->ah; 288 struct ath9k_keyval hk; 289 const u8 *mac = NULL; 290 u8 gmac[ETH_ALEN]; 291 int ret = 0; 292 int idx; 293 294 memset(&hk, 0, sizeof(hk)); 295 296 switch (key->alg) { 297 case ALG_WEP: 298 hk.kv_type = ATH9K_CIPHER_WEP; 299 break; 300 case ALG_TKIP: 301 hk.kv_type = ATH9K_CIPHER_TKIP; 302 break; 303 case ALG_CCMP: 304 hk.kv_type = ATH9K_CIPHER_AES_CCM; 305 break; 306 default: 307 return -EOPNOTSUPP; 308 } 309 310 hk.kv_len = key->keylen; 311 memcpy(hk.kv_val, key->key, key->keylen); 312 313 if (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) { 314 switch (vif->type) { 315 case NL80211_IFTYPE_AP: 316 memcpy(gmac, vif->addr, ETH_ALEN); 317 gmac[0] |= 0x01; 318 mac = gmac; 319 idx = ath_reserve_key_cache_slot(common, key->alg); 320 break; 321 case NL80211_IFTYPE_ADHOC: 322 if (!sta) { 323 idx = key->keyidx; 324 break; 325 } 326 memcpy(gmac, sta->addr, ETH_ALEN); 327 gmac[0] |= 0x01; 328 mac = gmac; 329 idx = ath_reserve_key_cache_slot(common, key->alg); 330 break; 331 default: 332 idx = key->keyidx; 333 break; 334 } 335 } else if (key->keyidx) { 336 if (WARN_ON(!sta)) 337 return -EOPNOTSUPP; 338 mac = sta->addr; 339 340 if (vif->type != NL80211_IFTYPE_AP) { 341 /* Only keyidx 0 should be used with unicast key, but 342 * allow this for client mode for now. */ 343 idx = key->keyidx; 344 } else 345 return -EIO; 346 } else { 347 if (WARN_ON(!sta)) 348 return -EOPNOTSUPP; 349 mac = sta->addr; 350 351 idx = ath_reserve_key_cache_slot(common, key->alg); 352 } 353 354 if (idx < 0) 355 return -ENOSPC; /* no free key cache entries */ 356 357 if (key->alg == ALG_TKIP) 358 ret = ath_setkey_tkip(common, idx, key->key, &hk, mac, 359 vif->type == NL80211_IFTYPE_AP); 360 else 361 ret = ath9k_hw_set_keycache_entry(ah, idx, &hk, mac); 362 363 if (!ret) 364 return -EIO; 365 366 set_bit(idx, common->keymap); 367 if (key->alg == ALG_TKIP) { 368 set_bit(idx + 64, common->keymap); 369 if (common->splitmic) { 370 set_bit(idx + 32, common->keymap); 371 set_bit(idx + 64 + 32, common->keymap); 372 } 373 } 374 375 return idx; 376 } 377 EXPORT_SYMBOL(ath9k_cmn_key_config); 378 379 /* 380 * Delete Key. 381 */ 382 void ath9k_cmn_key_delete(struct ath_common *common, 383 struct ieee80211_key_conf *key) 384 { 385 struct ath_hw *ah = common->ah; 386 387 ath9k_hw_keyreset(ah, key->hw_key_idx); 388 if (key->hw_key_idx < IEEE80211_WEP_NKID) 389 return; 390 391 clear_bit(key->hw_key_idx, common->keymap); 392 if (key->alg != ALG_TKIP) 393 return; 394 395 clear_bit(key->hw_key_idx + 64, common->keymap); 396 if (common->splitmic) { 397 ath9k_hw_keyreset(ah, key->hw_key_idx + 32); 398 clear_bit(key->hw_key_idx + 32, common->keymap); 399 clear_bit(key->hw_key_idx + 64 + 32, common->keymap); 400 } 401 } 402 EXPORT_SYMBOL(ath9k_cmn_key_delete); 403 404 int ath9k_cmn_count_streams(unsigned int chainmask, int max) 405 { 406 int streams = 0; 407 408 do { 409 if (++streams == max) 410 break; 411 } while ((chainmask = chainmask & (chainmask - 1))); 412 413 return streams; 414 } 415 EXPORT_SYMBOL(ath9k_cmn_count_streams); 416 417 static int __init ath9k_cmn_init(void) 418 { 419 return 0; 420 } 421 module_init(ath9k_cmn_init); 422 423 static void __exit ath9k_cmn_exit(void) 424 { 425 return; 426 } 427 module_exit(ath9k_cmn_exit); 428