1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * HT handling 4 * 5 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> 6 * Copyright 2002-2005, Instant802 Networks, Inc. 7 * Copyright 2005-2006, Devicescape Software, Inc. 8 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 9 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 10 * Copyright 2007-2010, Intel Corporation 11 * Copyright(c) 2015-2017 Intel Deutschland GmbH 12 * Copyright (C) 2018 Intel Corporation 13 */ 14 15 /** 16 * DOC: RX A-MPDU aggregation 17 * 18 * Aggregation on the RX side requires only implementing the 19 * @ampdu_action callback that is invoked to start/stop any 20 * block-ack sessions for RX aggregation. 21 * 22 * When RX aggregation is started by the peer, the driver is 23 * notified via @ampdu_action function, with the 24 * %IEEE80211_AMPDU_RX_START action, and may reject the request 25 * in which case a negative response is sent to the peer, if it 26 * accepts it a positive response is sent. 27 * 28 * While the session is active, the device/driver are required 29 * to de-aggregate frames and pass them up one by one to mac80211, 30 * which will handle the reorder buffer. 31 * 32 * When the aggregation session is stopped again by the peer or 33 * ourselves, the driver's @ampdu_action function will be called 34 * with the action %IEEE80211_AMPDU_RX_STOP. In this case, the 35 * call must not fail. 36 */ 37 38 #include <linux/ieee80211.h> 39 #include <linux/slab.h> 40 #include <linux/export.h> 41 #include <net/mac80211.h> 42 #include "ieee80211_i.h" 43 #include "driver-ops.h" 44 45 static void ieee80211_free_tid_rx(struct rcu_head *h) 46 { 47 struct tid_ampdu_rx *tid_rx = 48 container_of(h, struct tid_ampdu_rx, rcu_head); 49 int i; 50 51 for (i = 0; i < tid_rx->buf_size; i++) 52 __skb_queue_purge(&tid_rx->reorder_buf[i]); 53 kfree(tid_rx->reorder_buf); 54 kfree(tid_rx->reorder_time); 55 kfree(tid_rx); 56 } 57 58 void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, 59 u16 initiator, u16 reason, bool tx) 60 { 61 struct ieee80211_local *local = sta->local; 62 struct tid_ampdu_rx *tid_rx; 63 struct ieee80211_ampdu_params params = { 64 .sta = &sta->sta, 65 .action = IEEE80211_AMPDU_RX_STOP, 66 .tid = tid, 67 .amsdu = false, 68 .timeout = 0, 69 .ssn = 0, 70 }; 71 72 lockdep_assert_held(&sta->ampdu_mlme.mtx); 73 74 tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid], 75 lockdep_is_held(&sta->ampdu_mlme.mtx)); 76 77 if (!test_bit(tid, sta->ampdu_mlme.agg_session_valid)) 78 return; 79 80 RCU_INIT_POINTER(sta->ampdu_mlme.tid_rx[tid], NULL); 81 __clear_bit(tid, sta->ampdu_mlme.agg_session_valid); 82 83 ht_dbg(sta->sdata, 84 "Rx BA session stop requested for %pM tid %u %s reason: %d\n", 85 sta->sta.addr, tid, 86 initiator == WLAN_BACK_RECIPIENT ? "recipient" : "initiator", 87 (int)reason); 88 89 if (drv_ampdu_action(local, sta->sdata, ¶ms)) 90 sdata_info(sta->sdata, 91 "HW problem - can not stop rx aggregation for %pM tid %d\n", 92 sta->sta.addr, tid); 93 94 /* check if this is a self generated aggregation halt */ 95 if (initiator == WLAN_BACK_RECIPIENT && tx) 96 ieee80211_send_delba(sta->sdata, sta->sta.addr, 97 tid, WLAN_BACK_RECIPIENT, reason); 98 99 /* 100 * return here in case tid_rx is not assigned - which will happen if 101 * IEEE80211_HW_SUPPORTS_REORDERING_BUFFER is set. 102 */ 103 if (!tid_rx) 104 return; 105 106 del_timer_sync(&tid_rx->session_timer); 107 108 /* make sure ieee80211_sta_reorder_release() doesn't re-arm the timer */ 109 spin_lock_bh(&tid_rx->reorder_lock); 110 tid_rx->removed = true; 111 spin_unlock_bh(&tid_rx->reorder_lock); 112 del_timer_sync(&tid_rx->reorder_timer); 113 114 call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx); 115 } 116 117 void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, 118 u16 initiator, u16 reason, bool tx) 119 { 120 mutex_lock(&sta->ampdu_mlme.mtx); 121 ___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx); 122 mutex_unlock(&sta->ampdu_mlme.mtx); 123 } 124 125 void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap, 126 const u8 *addr) 127 { 128 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 129 struct sta_info *sta; 130 int i; 131 132 rcu_read_lock(); 133 sta = sta_info_get_bss(sdata, addr); 134 if (!sta) { 135 rcu_read_unlock(); 136 return; 137 } 138 139 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 140 if (ba_rx_bitmap & BIT(i)) 141 set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested); 142 143 ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work); 144 rcu_read_unlock(); 145 } 146 EXPORT_SYMBOL(ieee80211_stop_rx_ba_session); 147 148 /* 149 * After accepting the AddBA Request we activated a timer, 150 * resetting it after each frame that arrives from the originator. 151 */ 152 static void sta_rx_agg_session_timer_expired(struct timer_list *t) 153 { 154 struct tid_ampdu_rx *tid_rx = from_timer(tid_rx, t, session_timer); 155 struct sta_info *sta = tid_rx->sta; 156 u8 tid = tid_rx->tid; 157 unsigned long timeout; 158 159 timeout = tid_rx->last_rx + TU_TO_JIFFIES(tid_rx->timeout); 160 if (time_is_after_jiffies(timeout)) { 161 mod_timer(&tid_rx->session_timer, timeout); 162 return; 163 } 164 165 ht_dbg(sta->sdata, "RX session timer expired on %pM tid %d\n", 166 sta->sta.addr, tid); 167 168 set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired); 169 ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work); 170 } 171 172 static void sta_rx_agg_reorder_timer_expired(struct timer_list *t) 173 { 174 struct tid_ampdu_rx *tid_rx = from_timer(tid_rx, t, reorder_timer); 175 176 rcu_read_lock(); 177 ieee80211_release_reorder_timeout(tid_rx->sta, tid_rx->tid); 178 rcu_read_unlock(); 179 } 180 181 static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid, 182 u8 dialog_token, u16 status, u16 policy, 183 u16 buf_size, u16 timeout) 184 { 185 struct ieee80211_local *local = sdata->local; 186 struct sk_buff *skb; 187 struct ieee80211_mgmt *mgmt; 188 bool amsdu = ieee80211_hw_check(&local->hw, SUPPORTS_AMSDU_IN_AMPDU); 189 u16 capab; 190 191 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); 192 if (!skb) 193 return; 194 195 skb_reserve(skb, local->hw.extra_tx_headroom); 196 mgmt = skb_put_zero(skb, 24); 197 memcpy(mgmt->da, da, ETH_ALEN); 198 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 199 if (sdata->vif.type == NL80211_IFTYPE_AP || 200 sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 201 sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 202 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 203 else if (sdata->vif.type == NL80211_IFTYPE_STATION) 204 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 205 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 206 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); 207 208 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 209 IEEE80211_STYPE_ACTION); 210 211 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp)); 212 mgmt->u.action.category = WLAN_CATEGORY_BACK; 213 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; 214 mgmt->u.action.u.addba_resp.dialog_token = dialog_token; 215 216 capab = (u16)(amsdu << 0); /* bit 0 A-MSDU support */ 217 capab |= (u16)(policy << 1); /* bit 1 aggregation policy */ 218 capab |= (u16)(tid << 2); /* bit 5:2 TID number */ 219 capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */ 220 221 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); 222 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); 223 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); 224 225 ieee80211_tx_skb(sdata, skb); 226 } 227 228 void ___ieee80211_start_rx_ba_session(struct sta_info *sta, 229 u8 dialog_token, u16 timeout, 230 u16 start_seq_num, u16 ba_policy, u16 tid, 231 u16 buf_size, bool tx, bool auto_seq) 232 { 233 struct ieee80211_local *local = sta->sdata->local; 234 struct tid_ampdu_rx *tid_agg_rx; 235 struct ieee80211_ampdu_params params = { 236 .sta = &sta->sta, 237 .action = IEEE80211_AMPDU_RX_START, 238 .tid = tid, 239 .amsdu = false, 240 .timeout = timeout, 241 .ssn = start_seq_num, 242 }; 243 int i, ret = -EOPNOTSUPP; 244 u16 status = WLAN_STATUS_REQUEST_DECLINED; 245 u16 max_buf_size; 246 247 if (tid >= IEEE80211_FIRST_TSPEC_TSID) { 248 ht_dbg(sta->sdata, 249 "STA %pM requests BA session on unsupported tid %d\n", 250 sta->sta.addr, tid); 251 goto end; 252 } 253 254 if (!sta->sta.ht_cap.ht_supported) { 255 ht_dbg(sta->sdata, 256 "STA %pM erroneously requests BA session on tid %d w/o QoS\n", 257 sta->sta.addr, tid); 258 /* send a response anyway, it's an error case if we get here */ 259 goto end; 260 } 261 262 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { 263 ht_dbg(sta->sdata, 264 "Suspend in progress - Denying ADDBA request (%pM tid %d)\n", 265 sta->sta.addr, tid); 266 goto end; 267 } 268 269 if (sta->sta.he_cap.has_he) 270 max_buf_size = IEEE80211_MAX_AMPDU_BUF; 271 else 272 max_buf_size = IEEE80211_MAX_AMPDU_BUF_HT; 273 274 /* sanity check for incoming parameters: 275 * check if configuration can support the BA policy 276 * and if buffer size does not exceeds max value */ 277 /* XXX: check own ht delayed BA capability?? */ 278 if (((ba_policy != 1) && 279 (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) || 280 (buf_size > max_buf_size)) { 281 status = WLAN_STATUS_INVALID_QOS_PARAM; 282 ht_dbg_ratelimited(sta->sdata, 283 "AddBA Req with bad params from %pM on tid %u. policy %d, buffer size %d\n", 284 sta->sta.addr, tid, ba_policy, buf_size); 285 goto end; 286 } 287 /* determine default buffer size */ 288 if (buf_size == 0) 289 buf_size = max_buf_size; 290 291 /* make sure the size doesn't exceed the maximum supported by the hw */ 292 if (buf_size > sta->sta.max_rx_aggregation_subframes) 293 buf_size = sta->sta.max_rx_aggregation_subframes; 294 params.buf_size = buf_size; 295 296 ht_dbg(sta->sdata, "AddBA Req buf_size=%d for %pM\n", 297 buf_size, sta->sta.addr); 298 299 /* examine state machine */ 300 lockdep_assert_held(&sta->ampdu_mlme.mtx); 301 302 if (test_bit(tid, sta->ampdu_mlme.agg_session_valid)) { 303 if (sta->ampdu_mlme.tid_rx_token[tid] == dialog_token) { 304 struct tid_ampdu_rx *tid_rx; 305 306 ht_dbg_ratelimited(sta->sdata, 307 "updated AddBA Req from %pM on tid %u\n", 308 sta->sta.addr, tid); 309 /* We have no API to update the timeout value in the 310 * driver so reject the timeout update if the timeout 311 * changed. If if did not change, i.e., no real update, 312 * just reply with success. 313 */ 314 rcu_read_lock(); 315 tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 316 if (tid_rx && tid_rx->timeout == timeout) 317 status = WLAN_STATUS_SUCCESS; 318 else 319 status = WLAN_STATUS_REQUEST_DECLINED; 320 rcu_read_unlock(); 321 goto end; 322 } 323 324 ht_dbg_ratelimited(sta->sdata, 325 "unexpected AddBA Req from %pM on tid %u\n", 326 sta->sta.addr, tid); 327 328 /* delete existing Rx BA session on the same tid */ 329 ___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, 330 WLAN_STATUS_UNSPECIFIED_QOS, 331 false); 332 } 333 334 if (ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) { 335 ret = drv_ampdu_action(local, sta->sdata, ¶ms); 336 ht_dbg(sta->sdata, 337 "Rx A-MPDU request on %pM tid %d result %d\n", 338 sta->sta.addr, tid, ret); 339 if (!ret) 340 status = WLAN_STATUS_SUCCESS; 341 goto end; 342 } 343 344 /* prepare A-MPDU MLME for Rx aggregation */ 345 tid_agg_rx = kzalloc(sizeof(*tid_agg_rx), GFP_KERNEL); 346 if (!tid_agg_rx) 347 goto end; 348 349 spin_lock_init(&tid_agg_rx->reorder_lock); 350 351 /* rx timer */ 352 timer_setup(&tid_agg_rx->session_timer, 353 sta_rx_agg_session_timer_expired, TIMER_DEFERRABLE); 354 355 /* rx reorder timer */ 356 timer_setup(&tid_agg_rx->reorder_timer, 357 sta_rx_agg_reorder_timer_expired, 0); 358 359 /* prepare reordering buffer */ 360 tid_agg_rx->reorder_buf = 361 kcalloc(buf_size, sizeof(struct sk_buff_head), GFP_KERNEL); 362 tid_agg_rx->reorder_time = 363 kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL); 364 if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) { 365 kfree(tid_agg_rx->reorder_buf); 366 kfree(tid_agg_rx->reorder_time); 367 kfree(tid_agg_rx); 368 goto end; 369 } 370 371 for (i = 0; i < buf_size; i++) 372 __skb_queue_head_init(&tid_agg_rx->reorder_buf[i]); 373 374 ret = drv_ampdu_action(local, sta->sdata, ¶ms); 375 ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n", 376 sta->sta.addr, tid, ret); 377 if (ret) { 378 kfree(tid_agg_rx->reorder_buf); 379 kfree(tid_agg_rx->reorder_time); 380 kfree(tid_agg_rx); 381 goto end; 382 } 383 384 /* update data */ 385 tid_agg_rx->ssn = start_seq_num; 386 tid_agg_rx->head_seq_num = start_seq_num; 387 tid_agg_rx->buf_size = buf_size; 388 tid_agg_rx->timeout = timeout; 389 tid_agg_rx->stored_mpdu_num = 0; 390 tid_agg_rx->auto_seq = auto_seq; 391 tid_agg_rx->started = false; 392 tid_agg_rx->reorder_buf_filtered = 0; 393 tid_agg_rx->tid = tid; 394 tid_agg_rx->sta = sta; 395 status = WLAN_STATUS_SUCCESS; 396 397 /* activate it for RX */ 398 rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx); 399 400 if (timeout) { 401 mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout)); 402 tid_agg_rx->last_rx = jiffies; 403 } 404 405 end: 406 if (status == WLAN_STATUS_SUCCESS) { 407 __set_bit(tid, sta->ampdu_mlme.agg_session_valid); 408 __clear_bit(tid, sta->ampdu_mlme.unexpected_agg); 409 sta->ampdu_mlme.tid_rx_token[tid] = dialog_token; 410 } 411 412 if (tx) 413 ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid, 414 dialog_token, status, 1, buf_size, 415 timeout); 416 } 417 418 static void __ieee80211_start_rx_ba_session(struct sta_info *sta, 419 u8 dialog_token, u16 timeout, 420 u16 start_seq_num, u16 ba_policy, 421 u16 tid, u16 buf_size, bool tx, 422 bool auto_seq) 423 { 424 mutex_lock(&sta->ampdu_mlme.mtx); 425 ___ieee80211_start_rx_ba_session(sta, dialog_token, timeout, 426 start_seq_num, ba_policy, tid, 427 buf_size, tx, auto_seq); 428 mutex_unlock(&sta->ampdu_mlme.mtx); 429 } 430 431 void ieee80211_process_addba_request(struct ieee80211_local *local, 432 struct sta_info *sta, 433 struct ieee80211_mgmt *mgmt, 434 size_t len) 435 { 436 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num; 437 u8 dialog_token; 438 439 /* extract session parameters from addba request frame */ 440 dialog_token = mgmt->u.action.u.addba_req.dialog_token; 441 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); 442 start_seq_num = 443 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; 444 445 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); 446 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; 447 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; 448 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; 449 450 __ieee80211_start_rx_ba_session(sta, dialog_token, timeout, 451 start_seq_num, ba_policy, tid, 452 buf_size, true, false); 453 } 454 455 void ieee80211_manage_rx_ba_offl(struct ieee80211_vif *vif, 456 const u8 *addr, unsigned int tid) 457 { 458 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 459 struct ieee80211_local *local = sdata->local; 460 struct sta_info *sta; 461 462 rcu_read_lock(); 463 sta = sta_info_get_bss(sdata, addr); 464 if (!sta) 465 goto unlock; 466 467 set_bit(tid, sta->ampdu_mlme.tid_rx_manage_offl); 468 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); 469 unlock: 470 rcu_read_unlock(); 471 } 472 EXPORT_SYMBOL(ieee80211_manage_rx_ba_offl); 473 474 void ieee80211_rx_ba_timer_expired(struct ieee80211_vif *vif, 475 const u8 *addr, unsigned int tid) 476 { 477 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 478 struct ieee80211_local *local = sdata->local; 479 struct sta_info *sta; 480 481 rcu_read_lock(); 482 sta = sta_info_get_bss(sdata, addr); 483 if (!sta) 484 goto unlock; 485 486 set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired); 487 ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); 488 489 unlock: 490 rcu_read_unlock(); 491 } 492 EXPORT_SYMBOL(ieee80211_rx_ba_timer_expired); 493