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) 2018-2023 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_wiphy(sta->local->hw.wiphy); 73 74 tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid], 75 lockdep_is_held(&sta->local->hw.wiphy->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 ieee80211_vif *vif, u16 ba_rx_bitmap, 118 const u8 *addr) 119 { 120 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 121 struct sta_info *sta; 122 int i; 123 124 rcu_read_lock(); 125 sta = sta_info_get_bss(sdata, addr); 126 if (!sta) { 127 rcu_read_unlock(); 128 return; 129 } 130 131 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 132 if (ba_rx_bitmap & BIT(i)) 133 set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested); 134 135 wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 136 rcu_read_unlock(); 137 } 138 EXPORT_SYMBOL(ieee80211_stop_rx_ba_session); 139 140 /* 141 * After accepting the AddBA Request we activated a timer, 142 * resetting it after each frame that arrives from the originator. 143 */ 144 static void sta_rx_agg_session_timer_expired(struct timer_list *t) 145 { 146 struct tid_ampdu_rx *tid_rx = from_timer(tid_rx, t, session_timer); 147 struct sta_info *sta = tid_rx->sta; 148 u8 tid = tid_rx->tid; 149 unsigned long timeout; 150 151 timeout = tid_rx->last_rx + TU_TO_JIFFIES(tid_rx->timeout); 152 if (time_is_after_jiffies(timeout)) { 153 mod_timer(&tid_rx->session_timer, timeout); 154 return; 155 } 156 157 ht_dbg(sta->sdata, "RX session timer expired on %pM tid %d\n", 158 sta->sta.addr, tid); 159 160 set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired); 161 wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 162 } 163 164 static void sta_rx_agg_reorder_timer_expired(struct timer_list *t) 165 { 166 struct tid_ampdu_rx *tid_rx = from_timer(tid_rx, t, reorder_timer); 167 168 rcu_read_lock(); 169 ieee80211_release_reorder_timeout(tid_rx->sta, tid_rx->tid); 170 rcu_read_unlock(); 171 } 172 173 void ieee80211_add_addbaext(struct sk_buff *skb, 174 const u8 req_addba_ext_data, 175 u16 buf_size) 176 { 177 struct ieee80211_addba_ext_ie *addba_ext; 178 u8 *pos; 179 180 pos = skb_put_zero(skb, 2 + sizeof(struct ieee80211_addba_ext_ie)); 181 *pos++ = WLAN_EID_ADDBA_EXT; 182 *pos++ = sizeof(struct ieee80211_addba_ext_ie); 183 addba_ext = (struct ieee80211_addba_ext_ie *)pos; 184 185 addba_ext->data = IEEE80211_ADDBA_EXT_NO_FRAG; 186 if (req_addba_ext_data) 187 addba_ext->data &= req_addba_ext_data; 188 189 addba_ext->data |= 190 u8_encode_bits(buf_size >> IEEE80211_ADDBA_EXT_BUF_SIZE_SHIFT, 191 IEEE80211_ADDBA_EXT_BUF_SIZE_MASK); 192 } 193 194 u8 ieee80211_retrieve_addba_ext_data(struct sta_info *sta, 195 const void *elem_data, ssize_t elem_len, 196 u16 *buf_size) 197 { 198 struct ieee802_11_elems *elems; 199 u8 buf_size_1k, data = 0; 200 201 if (!sta->sta.deflink.he_cap.has_he) 202 return 0; 203 204 if (elem_len <= 0) 205 return 0; 206 207 elems = ieee802_11_parse_elems(elem_data, elem_len, true, NULL); 208 209 if (elems && !elems->parse_error && elems->addba_ext_ie) { 210 data = elems->addba_ext_ie->data; 211 212 if (!sta->sta.deflink.eht_cap.has_eht || !buf_size) 213 goto free; 214 215 buf_size_1k = u8_get_bits(elems->addba_ext_ie->data, 216 IEEE80211_ADDBA_EXT_BUF_SIZE_MASK); 217 *buf_size |= (u16)buf_size_1k << 218 IEEE80211_ADDBA_EXT_BUF_SIZE_SHIFT; 219 } 220 free: 221 kfree(elems); 222 223 return data; 224 } 225 226 static void ieee80211_send_addba_resp(struct sta_info *sta, u8 *da, u16 tid, 227 u8 dialog_token, u16 status, u16 policy, 228 u16 buf_size, u16 timeout, 229 const u8 req_addba_ext_data) 230 { 231 struct ieee80211_sub_if_data *sdata = sta->sdata; 232 struct ieee80211_local *local = sdata->local; 233 struct sk_buff *skb; 234 struct ieee80211_mgmt *mgmt; 235 bool amsdu = ieee80211_hw_check(&local->hw, SUPPORTS_AMSDU_IN_AMPDU); 236 u16 capab; 237 238 skb = dev_alloc_skb(sizeof(*mgmt) + 239 2 + sizeof(struct ieee80211_addba_ext_ie) + 240 local->hw.extra_tx_headroom); 241 if (!skb) 242 return; 243 244 skb_reserve(skb, local->hw.extra_tx_headroom); 245 mgmt = ieee80211_mgmt_ba(skb, da, sdata); 246 247 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp)); 248 mgmt->u.action.category = WLAN_CATEGORY_BACK; 249 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; 250 mgmt->u.action.u.addba_resp.dialog_token = dialog_token; 251 252 capab = u16_encode_bits(amsdu, IEEE80211_ADDBA_PARAM_AMSDU_MASK); 253 capab |= u16_encode_bits(policy, IEEE80211_ADDBA_PARAM_POLICY_MASK); 254 capab |= u16_encode_bits(tid, IEEE80211_ADDBA_PARAM_TID_MASK); 255 capab |= u16_encode_bits(buf_size, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK); 256 257 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); 258 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); 259 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); 260 261 if (sta->sta.deflink.he_cap.has_he) 262 ieee80211_add_addbaext(skb, req_addba_ext_data, buf_size); 263 264 ieee80211_tx_skb(sdata, skb); 265 } 266 267 void __ieee80211_start_rx_ba_session(struct sta_info *sta, 268 u8 dialog_token, u16 timeout, 269 u16 start_seq_num, u16 ba_policy, u16 tid, 270 u16 buf_size, bool tx, bool auto_seq, 271 const u8 addba_ext_data) 272 { 273 struct ieee80211_local *local = sta->sdata->local; 274 struct tid_ampdu_rx *tid_agg_rx; 275 struct ieee80211_ampdu_params params = { 276 .sta = &sta->sta, 277 .action = IEEE80211_AMPDU_RX_START, 278 .tid = tid, 279 .amsdu = false, 280 .timeout = timeout, 281 .ssn = start_seq_num, 282 }; 283 int i, ret = -EOPNOTSUPP; 284 u16 status = WLAN_STATUS_REQUEST_DECLINED; 285 u16 max_buf_size; 286 287 lockdep_assert_wiphy(sta->local->hw.wiphy); 288 289 if (tid >= IEEE80211_FIRST_TSPEC_TSID) { 290 ht_dbg(sta->sdata, 291 "STA %pM requests BA session on unsupported tid %d\n", 292 sta->sta.addr, tid); 293 goto end; 294 } 295 296 if (!sta->sta.deflink.ht_cap.ht_supported && 297 !sta->sta.deflink.he_cap.has_he) { 298 ht_dbg(sta->sdata, 299 "STA %pM erroneously requests BA session on tid %d w/o HT\n", 300 sta->sta.addr, tid); 301 /* send a response anyway, it's an error case if we get here */ 302 goto end; 303 } 304 305 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { 306 ht_dbg(sta->sdata, 307 "Suspend in progress - Denying ADDBA request (%pM tid %d)\n", 308 sta->sta.addr, tid); 309 goto end; 310 } 311 312 if (sta->sta.deflink.eht_cap.has_eht) 313 max_buf_size = IEEE80211_MAX_AMPDU_BUF_EHT; 314 else if (sta->sta.deflink.he_cap.has_he) 315 max_buf_size = IEEE80211_MAX_AMPDU_BUF_HE; 316 else 317 max_buf_size = IEEE80211_MAX_AMPDU_BUF_HT; 318 319 /* sanity check for incoming parameters: 320 * check if configuration can support the BA policy 321 * and if buffer size does not exceeds max value */ 322 /* XXX: check own ht delayed BA capability?? */ 323 if (((ba_policy != 1) && 324 (!(sta->sta.deflink.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) || 325 (buf_size > max_buf_size)) { 326 status = WLAN_STATUS_INVALID_QOS_PARAM; 327 ht_dbg_ratelimited(sta->sdata, 328 "AddBA Req with bad params from %pM on tid %u. policy %d, buffer size %d\n", 329 sta->sta.addr, tid, ba_policy, buf_size); 330 goto end; 331 } 332 /* determine default buffer size */ 333 if (buf_size == 0) 334 buf_size = max_buf_size; 335 336 /* make sure the size doesn't exceed the maximum supported by the hw */ 337 if (buf_size > sta->sta.max_rx_aggregation_subframes) 338 buf_size = sta->sta.max_rx_aggregation_subframes; 339 params.buf_size = buf_size; 340 341 ht_dbg(sta->sdata, "AddBA Req buf_size=%d for %pM\n", 342 buf_size, sta->sta.addr); 343 344 if (test_bit(tid, sta->ampdu_mlme.agg_session_valid)) { 345 if (sta->ampdu_mlme.tid_rx_token[tid] == dialog_token) { 346 struct tid_ampdu_rx *tid_rx; 347 348 ht_dbg_ratelimited(sta->sdata, 349 "updated AddBA Req from %pM on tid %u\n", 350 sta->sta.addr, tid); 351 /* We have no API to update the timeout value in the 352 * driver so reject the timeout update if the timeout 353 * changed. If it did not change, i.e., no real update, 354 * just reply with success. 355 */ 356 rcu_read_lock(); 357 tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 358 if (tid_rx && tid_rx->timeout == timeout) 359 status = WLAN_STATUS_SUCCESS; 360 else 361 status = WLAN_STATUS_REQUEST_DECLINED; 362 rcu_read_unlock(); 363 goto end; 364 } 365 366 ht_dbg_ratelimited(sta->sdata, 367 "unexpected AddBA Req from %pM on tid %u\n", 368 sta->sta.addr, tid); 369 370 /* delete existing Rx BA session on the same tid */ 371 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, 372 WLAN_STATUS_UNSPECIFIED_QOS, 373 false); 374 } 375 376 if (ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) { 377 ret = drv_ampdu_action(local, sta->sdata, ¶ms); 378 ht_dbg(sta->sdata, 379 "Rx A-MPDU request on %pM tid %d result %d\n", 380 sta->sta.addr, tid, ret); 381 if (!ret) 382 status = WLAN_STATUS_SUCCESS; 383 goto end; 384 } 385 386 /* prepare A-MPDU MLME for Rx aggregation */ 387 tid_agg_rx = kzalloc(sizeof(*tid_agg_rx), GFP_KERNEL); 388 if (!tid_agg_rx) 389 goto end; 390 391 spin_lock_init(&tid_agg_rx->reorder_lock); 392 393 /* rx timer */ 394 timer_setup(&tid_agg_rx->session_timer, 395 sta_rx_agg_session_timer_expired, TIMER_DEFERRABLE); 396 397 /* rx reorder timer */ 398 timer_setup(&tid_agg_rx->reorder_timer, 399 sta_rx_agg_reorder_timer_expired, 0); 400 401 /* prepare reordering buffer */ 402 tid_agg_rx->reorder_buf = 403 kcalloc(buf_size, sizeof(struct sk_buff_head), GFP_KERNEL); 404 tid_agg_rx->reorder_time = 405 kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL); 406 if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) { 407 kfree(tid_agg_rx->reorder_buf); 408 kfree(tid_agg_rx->reorder_time); 409 kfree(tid_agg_rx); 410 goto end; 411 } 412 413 for (i = 0; i < buf_size; i++) 414 __skb_queue_head_init(&tid_agg_rx->reorder_buf[i]); 415 416 ret = drv_ampdu_action(local, sta->sdata, ¶ms); 417 ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n", 418 sta->sta.addr, tid, ret); 419 if (ret) { 420 kfree(tid_agg_rx->reorder_buf); 421 kfree(tid_agg_rx->reorder_time); 422 kfree(tid_agg_rx); 423 goto end; 424 } 425 426 /* update data */ 427 tid_agg_rx->ssn = start_seq_num; 428 tid_agg_rx->head_seq_num = start_seq_num; 429 tid_agg_rx->buf_size = buf_size; 430 tid_agg_rx->timeout = timeout; 431 tid_agg_rx->stored_mpdu_num = 0; 432 tid_agg_rx->auto_seq = auto_seq; 433 tid_agg_rx->started = false; 434 tid_agg_rx->reorder_buf_filtered = 0; 435 tid_agg_rx->tid = tid; 436 tid_agg_rx->sta = sta; 437 status = WLAN_STATUS_SUCCESS; 438 439 /* activate it for RX */ 440 rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx); 441 442 if (timeout) { 443 mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout)); 444 tid_agg_rx->last_rx = jiffies; 445 } 446 447 end: 448 if (status == WLAN_STATUS_SUCCESS) { 449 __set_bit(tid, sta->ampdu_mlme.agg_session_valid); 450 __clear_bit(tid, sta->ampdu_mlme.unexpected_agg); 451 sta->ampdu_mlme.tid_rx_token[tid] = dialog_token; 452 } 453 454 if (tx) 455 ieee80211_send_addba_resp(sta, sta->sta.addr, tid, 456 dialog_token, status, 1, buf_size, 457 timeout, addba_ext_data); 458 } 459 460 void ieee80211_process_addba_request(struct ieee80211_local *local, 461 struct sta_info *sta, 462 struct ieee80211_mgmt *mgmt, 463 size_t len) 464 { 465 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num; 466 u8 dialog_token, addba_ext_data; 467 468 /* extract session parameters from addba request frame */ 469 dialog_token = mgmt->u.action.u.addba_req.dialog_token; 470 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); 471 start_seq_num = 472 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; 473 474 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); 475 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; 476 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; 477 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; 478 479 addba_ext_data = 480 ieee80211_retrieve_addba_ext_data(sta, 481 mgmt->u.action.u.addba_req.variable, 482 len - 483 offsetof(typeof(*mgmt), 484 u.action.u.addba_req.variable), 485 &buf_size); 486 487 __ieee80211_start_rx_ba_session(sta, dialog_token, timeout, 488 start_seq_num, ba_policy, tid, 489 buf_size, true, false, addba_ext_data); 490 } 491 492 void ieee80211_manage_rx_ba_offl(struct ieee80211_vif *vif, 493 const u8 *addr, unsigned int tid) 494 { 495 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 496 struct sta_info *sta; 497 498 rcu_read_lock(); 499 sta = sta_info_get_bss(sdata, addr); 500 if (!sta) 501 goto unlock; 502 503 set_bit(tid, sta->ampdu_mlme.tid_rx_manage_offl); 504 wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 505 unlock: 506 rcu_read_unlock(); 507 } 508 EXPORT_SYMBOL(ieee80211_manage_rx_ba_offl); 509 510 void ieee80211_rx_ba_timer_expired(struct ieee80211_vif *vif, 511 const u8 *addr, unsigned int tid) 512 { 513 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 514 struct sta_info *sta; 515 516 rcu_read_lock(); 517 sta = sta_info_get_bss(sdata, addr); 518 if (!sta) 519 goto unlock; 520 521 set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired); 522 wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 523 524 unlock: 525 rcu_read_unlock(); 526 } 527 EXPORT_SYMBOL(ieee80211_rx_ba_timer_expired); 528