1 /* 2 * HT handling 3 * 4 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> 5 * Copyright 2002-2005, Instant802 Networks, Inc. 6 * Copyright 2005-2006, Devicescape Software, Inc. 7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 9 * Copyright 2007-2010, Intel Corporation 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License version 2 as 13 * published by the Free Software Foundation. 14 */ 15 16 #include <linux/ieee80211.h> 17 #include <linux/export.h> 18 #include <net/mac80211.h> 19 #include "ieee80211_i.h" 20 #include "rate.h" 21 22 static void __check_htcap_disable(struct ieee80211_sub_if_data *sdata, 23 struct ieee80211_sta_ht_cap *ht_cap, 24 u16 flag) 25 { 26 __le16 le_flag = cpu_to_le16(flag); 27 if (sdata->u.mgd.ht_capa_mask.cap_info & le_flag) { 28 if (!(sdata->u.mgd.ht_capa.cap_info & le_flag)) 29 ht_cap->cap &= ~flag; 30 } 31 } 32 33 void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata, 34 struct ieee80211_sta_ht_cap *ht_cap) 35 { 36 u8 *scaps = (u8 *)(&sdata->u.mgd.ht_capa.mcs.rx_mask); 37 u8 *smask = (u8 *)(&sdata->u.mgd.ht_capa_mask.mcs.rx_mask); 38 int i; 39 40 if (!ht_cap->ht_supported) 41 return; 42 43 if (sdata->vif.type != NL80211_IFTYPE_STATION) { 44 /* AP interfaces call this code when adding new stations, 45 * so just silently ignore non station interfaces. 46 */ 47 return; 48 } 49 50 /* NOTE: If you add more over-rides here, update register_hw 51 * ht_capa_mod_msk logic in main.c as well. 52 * And, if this method can ever change ht_cap.ht_supported, fix 53 * the check in ieee80211_add_ht_ie. 54 */ 55 56 /* check for HT over-rides, MCS rates first. */ 57 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) { 58 u8 m = smask[i]; 59 ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */ 60 /* Add back rates that are supported */ 61 ht_cap->mcs.rx_mask[i] |= (m & scaps[i]); 62 } 63 64 /* Force removal of HT-40 capabilities? */ 65 __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SUP_WIDTH_20_40); 66 __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_40); 67 68 /* Allow user to disable SGI-20 (SGI-40 is handled above) */ 69 __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_20); 70 71 /* Allow user to disable the max-AMSDU bit. */ 72 __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_MAX_AMSDU); 73 74 /* Allow user to decrease AMPDU factor */ 75 if (sdata->u.mgd.ht_capa_mask.ampdu_params_info & 76 IEEE80211_HT_AMPDU_PARM_FACTOR) { 77 u8 n = sdata->u.mgd.ht_capa.ampdu_params_info 78 & IEEE80211_HT_AMPDU_PARM_FACTOR; 79 if (n < ht_cap->ampdu_factor) 80 ht_cap->ampdu_factor = n; 81 } 82 83 /* Allow the user to increase AMPDU density. */ 84 if (sdata->u.mgd.ht_capa_mask.ampdu_params_info & 85 IEEE80211_HT_AMPDU_PARM_DENSITY) { 86 u8 n = (sdata->u.mgd.ht_capa.ampdu_params_info & 87 IEEE80211_HT_AMPDU_PARM_DENSITY) 88 >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT; 89 if (n > ht_cap->ampdu_density) 90 ht_cap->ampdu_density = n; 91 } 92 } 93 94 95 bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata, 96 struct ieee80211_supported_band *sband, 97 const struct ieee80211_ht_cap *ht_cap_ie, 98 struct sta_info *sta) 99 { 100 struct ieee80211_sta_ht_cap ht_cap; 101 u8 ampdu_info, tx_mcs_set_cap; 102 int i, max_tx_streams; 103 bool changed; 104 enum ieee80211_sta_rx_bandwidth bw; 105 enum ieee80211_smps_mode smps_mode; 106 107 memset(&ht_cap, 0, sizeof(ht_cap)); 108 109 if (!ht_cap_ie || !sband->ht_cap.ht_supported) 110 goto apply; 111 112 ht_cap.ht_supported = true; 113 114 /* 115 * The bits listed in this expression should be 116 * the same for the peer and us, if the station 117 * advertises more then we can't use those thus 118 * we mask them out. 119 */ 120 ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) & 121 (sband->ht_cap.cap | 122 ~(IEEE80211_HT_CAP_LDPC_CODING | 123 IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 124 IEEE80211_HT_CAP_GRN_FLD | 125 IEEE80211_HT_CAP_SGI_20 | 126 IEEE80211_HT_CAP_SGI_40 | 127 IEEE80211_HT_CAP_DSSSCCK40)); 128 129 /* 130 * The STBC bits are asymmetric -- if we don't have 131 * TX then mask out the peer's RX and vice versa. 132 */ 133 if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC)) 134 ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC; 135 if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC)) 136 ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC; 137 138 ampdu_info = ht_cap_ie->ampdu_params_info; 139 ht_cap.ampdu_factor = 140 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; 141 ht_cap.ampdu_density = 142 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; 143 144 /* own MCS TX capabilities */ 145 tx_mcs_set_cap = sband->ht_cap.mcs.tx_params; 146 147 /* Copy peer MCS TX capabilities, the driver might need them. */ 148 ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params; 149 150 /* can we TX with MCS rates? */ 151 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) 152 goto apply; 153 154 /* Counting from 0, therefore +1 */ 155 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) 156 max_tx_streams = 157 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) 158 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; 159 else 160 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; 161 162 /* 163 * 802.11n-2009 20.3.5 / 20.6 says: 164 * - indices 0 to 7 and 32 are single spatial stream 165 * - 8 to 31 are multiple spatial streams using equal modulation 166 * [8..15 for two streams, 16..23 for three and 24..31 for four] 167 * - remainder are multiple spatial streams using unequal modulation 168 */ 169 for (i = 0; i < max_tx_streams; i++) 170 ht_cap.mcs.rx_mask[i] = 171 sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; 172 173 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) 174 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; 175 i < IEEE80211_HT_MCS_MASK_LEN; i++) 176 ht_cap.mcs.rx_mask[i] = 177 sband->ht_cap.mcs.rx_mask[i] & 178 ht_cap_ie->mcs.rx_mask[i]; 179 180 /* handle MCS rate 32 too */ 181 if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) 182 ht_cap.mcs.rx_mask[32/8] |= 1; 183 184 apply: 185 /* 186 * If user has specified capability over-rides, take care 187 * of that here. 188 */ 189 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 190 191 changed = memcmp(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap)); 192 193 memcpy(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap)); 194 195 switch (sdata->vif.bss_conf.chandef.width) { 196 default: 197 WARN_ON_ONCE(1); 198 /* fall through */ 199 case NL80211_CHAN_WIDTH_20_NOHT: 200 case NL80211_CHAN_WIDTH_20: 201 bw = IEEE80211_STA_RX_BW_20; 202 break; 203 case NL80211_CHAN_WIDTH_40: 204 case NL80211_CHAN_WIDTH_80: 205 case NL80211_CHAN_WIDTH_80P80: 206 case NL80211_CHAN_WIDTH_160: 207 bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 208 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 209 break; 210 } 211 212 if (bw != sta->sta.bandwidth) 213 changed = true; 214 sta->sta.bandwidth = bw; 215 216 sta->cur_max_bandwidth = 217 ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 218 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 219 220 switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS) 221 >> IEEE80211_HT_CAP_SM_PS_SHIFT) { 222 case WLAN_HT_CAP_SM_PS_INVALID: 223 case WLAN_HT_CAP_SM_PS_STATIC: 224 smps_mode = IEEE80211_SMPS_STATIC; 225 break; 226 case WLAN_HT_CAP_SM_PS_DYNAMIC: 227 smps_mode = IEEE80211_SMPS_DYNAMIC; 228 break; 229 case WLAN_HT_CAP_SM_PS_DISABLED: 230 smps_mode = IEEE80211_SMPS_OFF; 231 break; 232 } 233 234 if (smps_mode != sta->sta.smps_mode) 235 changed = true; 236 sta->sta.smps_mode = smps_mode; 237 238 return changed; 239 } 240 241 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, 242 enum ieee80211_agg_stop_reason reason) 243 { 244 int i; 245 246 cancel_work_sync(&sta->ampdu_mlme.work); 247 248 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 249 __ieee80211_stop_tx_ba_session(sta, i, reason); 250 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, 251 WLAN_REASON_QSTA_LEAVE_QBSS, 252 reason != AGG_STOP_DESTROY_STA && 253 reason != AGG_STOP_PEER_REQUEST); 254 } 255 } 256 257 void ieee80211_ba_session_work(struct work_struct *work) 258 { 259 struct sta_info *sta = 260 container_of(work, struct sta_info, ampdu_mlme.work); 261 struct tid_ampdu_tx *tid_tx; 262 int tid; 263 264 /* 265 * When this flag is set, new sessions should be 266 * blocked, and existing sessions will be torn 267 * down by the code that set the flag, so this 268 * need not run. 269 */ 270 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) 271 return; 272 273 mutex_lock(&sta->ampdu_mlme.mtx); 274 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { 275 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) 276 ___ieee80211_stop_rx_ba_session( 277 sta, tid, WLAN_BACK_RECIPIENT, 278 WLAN_REASON_QSTA_TIMEOUT, true); 279 280 if (test_and_clear_bit(tid, 281 sta->ampdu_mlme.tid_rx_stop_requested)) 282 ___ieee80211_stop_rx_ba_session( 283 sta, tid, WLAN_BACK_RECIPIENT, 284 WLAN_REASON_UNSPECIFIED, true); 285 286 tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; 287 if (tid_tx) { 288 /* 289 * Assign it over to the normal tid_tx array 290 * where it "goes live". 291 */ 292 spin_lock_bh(&sta->lock); 293 294 sta->ampdu_mlme.tid_start_tx[tid] = NULL; 295 /* could there be a race? */ 296 if (sta->ampdu_mlme.tid_tx[tid]) 297 kfree(tid_tx); 298 else 299 ieee80211_assign_tid_tx(sta, tid, tid_tx); 300 spin_unlock_bh(&sta->lock); 301 302 ieee80211_tx_ba_session_handle_start(sta, tid); 303 continue; 304 } 305 306 tid_tx = rcu_dereference_protected_tid_tx(sta, tid); 307 if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP, 308 &tid_tx->state)) 309 ___ieee80211_stop_tx_ba_session(sta, tid, 310 AGG_STOP_LOCAL_REQUEST); 311 } 312 mutex_unlock(&sta->ampdu_mlme.mtx); 313 } 314 315 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, 316 const u8 *da, u16 tid, 317 u16 initiator, u16 reason_code) 318 { 319 struct ieee80211_local *local = sdata->local; 320 struct sk_buff *skb; 321 struct ieee80211_mgmt *mgmt; 322 u16 params; 323 324 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); 325 if (!skb) 326 return; 327 328 skb_reserve(skb, local->hw.extra_tx_headroom); 329 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 330 memset(mgmt, 0, 24); 331 memcpy(mgmt->da, da, ETH_ALEN); 332 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 333 if (sdata->vif.type == NL80211_IFTYPE_AP || 334 sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 335 sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 336 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 337 else if (sdata->vif.type == NL80211_IFTYPE_STATION) 338 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 339 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 340 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); 341 342 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 343 IEEE80211_STYPE_ACTION); 344 345 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); 346 347 mgmt->u.action.category = WLAN_CATEGORY_BACK; 348 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; 349 params = (u16)(initiator << 11); /* bit 11 initiator */ 350 params |= (u16)(tid << 12); /* bit 15:12 TID number */ 351 352 mgmt->u.action.u.delba.params = cpu_to_le16(params); 353 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); 354 355 ieee80211_tx_skb_tid(sdata, skb, tid); 356 } 357 358 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, 359 struct sta_info *sta, 360 struct ieee80211_mgmt *mgmt, size_t len) 361 { 362 u16 tid, params; 363 u16 initiator; 364 365 params = le16_to_cpu(mgmt->u.action.u.delba.params); 366 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; 367 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; 368 369 ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n", 370 mgmt->sa, initiator ? "initiator" : "recipient", 371 tid, 372 le16_to_cpu(mgmt->u.action.u.delba.reason_code)); 373 374 if (initiator == WLAN_BACK_INITIATOR) 375 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0, 376 true); 377 else 378 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST); 379 } 380 381 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, 382 enum ieee80211_smps_mode smps, const u8 *da, 383 const u8 *bssid) 384 { 385 struct ieee80211_local *local = sdata->local; 386 struct sk_buff *skb; 387 struct ieee80211_mgmt *action_frame; 388 389 /* 27 = header + category + action + smps mode */ 390 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); 391 if (!skb) 392 return -ENOMEM; 393 394 skb_reserve(skb, local->hw.extra_tx_headroom); 395 action_frame = (void *)skb_put(skb, 27); 396 memcpy(action_frame->da, da, ETH_ALEN); 397 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); 398 memcpy(action_frame->bssid, bssid, ETH_ALEN); 399 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 400 IEEE80211_STYPE_ACTION); 401 action_frame->u.action.category = WLAN_CATEGORY_HT; 402 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; 403 switch (smps) { 404 case IEEE80211_SMPS_AUTOMATIC: 405 case IEEE80211_SMPS_NUM_MODES: 406 WARN_ON(1); 407 case IEEE80211_SMPS_OFF: 408 action_frame->u.action.u.ht_smps.smps_control = 409 WLAN_HT_SMPS_CONTROL_DISABLED; 410 break; 411 case IEEE80211_SMPS_STATIC: 412 action_frame->u.action.u.ht_smps.smps_control = 413 WLAN_HT_SMPS_CONTROL_STATIC; 414 break; 415 case IEEE80211_SMPS_DYNAMIC: 416 action_frame->u.action.u.ht_smps.smps_control = 417 WLAN_HT_SMPS_CONTROL_DYNAMIC; 418 break; 419 } 420 421 /* we'll do more on status of this frame */ 422 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 423 ieee80211_tx_skb(sdata, skb); 424 425 return 0; 426 } 427 428 void ieee80211_request_smps_work(struct work_struct *work) 429 { 430 struct ieee80211_sub_if_data *sdata = 431 container_of(work, struct ieee80211_sub_if_data, 432 u.mgd.request_smps_work); 433 434 mutex_lock(&sdata->u.mgd.mtx); 435 __ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode); 436 mutex_unlock(&sdata->u.mgd.mtx); 437 } 438 439 void ieee80211_request_smps(struct ieee80211_vif *vif, 440 enum ieee80211_smps_mode smps_mode) 441 { 442 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 443 444 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 445 return; 446 447 if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF)) 448 smps_mode = IEEE80211_SMPS_AUTOMATIC; 449 450 if (sdata->u.mgd.driver_smps_mode == smps_mode) 451 return; 452 453 sdata->u.mgd.driver_smps_mode = smps_mode; 454 455 ieee80211_queue_work(&sdata->local->hw, 456 &sdata->u.mgd.request_smps_work); 457 } 458 /* this might change ... don't want non-open drivers using it */ 459 EXPORT_SYMBOL_GPL(ieee80211_request_smps); 460