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) 2018-2025 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 timer_delete_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 timer_delete_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 = timer_container_of(tid_rx, t, 147 session_timer); 148 struct sta_info *sta = tid_rx->sta; 149 u8 tid = tid_rx->tid; 150 unsigned long timeout; 151 152 timeout = tid_rx->last_rx + TU_TO_JIFFIES(tid_rx->timeout); 153 if (time_is_after_jiffies(timeout)) { 154 mod_timer(&tid_rx->session_timer, timeout); 155 return; 156 } 157 158 ht_dbg(sta->sdata, "RX session timer expired on %pM tid %d\n", 159 sta->sta.addr, tid); 160 161 set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired); 162 wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 163 } 164 165 static void sta_rx_agg_reorder_timer_expired(struct timer_list *t) 166 { 167 struct tid_ampdu_rx *tid_rx = timer_container_of(tid_rx, t, 168 reorder_timer); 169 170 rcu_read_lock(); 171 ieee80211_release_reorder_timeout(tid_rx->sta, tid_rx->tid); 172 rcu_read_unlock(); 173 } 174 175 void ieee80211_add_addbaext(struct sk_buff *skb, 176 const u8 req_addba_ext_data, 177 u16 buf_size) 178 { 179 struct ieee80211_addba_ext_ie *addba_ext; 180 u8 *pos; 181 182 pos = skb_put_zero(skb, 2 + sizeof(struct ieee80211_addba_ext_ie)); 183 *pos++ = WLAN_EID_ADDBA_EXT; 184 *pos++ = sizeof(struct ieee80211_addba_ext_ie); 185 addba_ext = (struct ieee80211_addba_ext_ie *)pos; 186 187 addba_ext->data = IEEE80211_ADDBA_EXT_NO_FRAG; 188 if (req_addba_ext_data) 189 addba_ext->data &= req_addba_ext_data; 190 191 addba_ext->data |= 192 u8_encode_bits(buf_size >> IEEE80211_ADDBA_EXT_BUF_SIZE_SHIFT, 193 IEEE80211_ADDBA_EXT_BUF_SIZE_MASK); 194 } 195 196 u8 ieee80211_retrieve_addba_ext_data(struct sta_info *sta, 197 const void *elem_data, ssize_t elem_len, 198 u16 *buf_size) 199 { 200 struct ieee802_11_elems *elems; 201 u8 buf_size_1k, data = 0; 202 203 if (!sta->sta.deflink.he_cap.has_he) 204 return 0; 205 206 if (elem_len <= 0) 207 return 0; 208 209 elems = ieee802_11_parse_elems(elem_data, elem_len, 210 IEEE80211_FTYPE_MGMT | 211 IEEE80211_STYPE_ACTION, 212 NULL); 213 214 if (!elems || elems->parse_error || !elems->addba_ext_ie) 215 goto free; 216 217 data = elems->addba_ext_ie->data; 218 219 if (buf_size && 220 (sta->sta.valid_links || sta->sta.deflink.eht_cap.has_eht)) { 221 buf_size_1k = u8_get_bits(elems->addba_ext_ie->data, 222 IEEE80211_ADDBA_EXT_BUF_SIZE_MASK); 223 *buf_size |= (u16)buf_size_1k << 224 IEEE80211_ADDBA_EXT_BUF_SIZE_SHIFT; 225 } 226 227 free: 228 kfree(elems); 229 230 return data; 231 } 232 233 static void ieee80211_send_addba_resp(struct sta_info *sta, u8 *da, u16 tid, 234 u8 dialog_token, u16 status, u16 policy, 235 u16 buf_size, u16 timeout, 236 const u8 req_addba_ext_data) 237 { 238 struct ieee80211_sub_if_data *sdata = sta->sdata; 239 struct ieee80211_local *local = sdata->local; 240 struct sk_buff *skb; 241 struct ieee80211_mgmt *mgmt; 242 bool amsdu = ieee80211_hw_check(&local->hw, SUPPORTS_AMSDU_IN_AMPDU); 243 u16 capab; 244 245 skb = dev_alloc_skb(sizeof(*mgmt) + 246 2 + sizeof(struct ieee80211_addba_ext_ie) + 247 local->hw.extra_tx_headroom); 248 if (!skb) 249 return; 250 251 skb_reserve(skb, local->hw.extra_tx_headroom); 252 mgmt = ieee80211_mgmt_ba(skb, da, sdata); 253 254 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp)); 255 mgmt->u.action.category = WLAN_CATEGORY_BACK; 256 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; 257 mgmt->u.action.u.addba_resp.dialog_token = dialog_token; 258 259 capab = u16_encode_bits(amsdu, IEEE80211_ADDBA_PARAM_AMSDU_MASK); 260 capab |= u16_encode_bits(policy, IEEE80211_ADDBA_PARAM_POLICY_MASK); 261 capab |= u16_encode_bits(tid, IEEE80211_ADDBA_PARAM_TID_MASK); 262 capab |= u16_encode_bits(buf_size, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK); 263 264 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); 265 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); 266 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); 267 268 if (sta->sta.valid_links || sta->sta.deflink.he_cap.has_he) 269 ieee80211_add_addbaext(skb, req_addba_ext_data, buf_size); 270 271 ieee80211_tx_skb(sdata, skb); 272 } 273 274 void __ieee80211_start_rx_ba_session(struct sta_info *sta, 275 u8 dialog_token, u16 timeout, 276 u16 start_seq_num, u16 ba_policy, u16 tid, 277 u16 buf_size, bool tx, bool auto_seq, 278 const u8 addba_ext_data) 279 { 280 struct ieee80211_local *local = sta->sdata->local; 281 struct tid_ampdu_rx *tid_agg_rx; 282 struct ieee80211_ampdu_params params = { 283 .sta = &sta->sta, 284 .action = IEEE80211_AMPDU_RX_START, 285 .tid = tid, 286 .amsdu = false, 287 .timeout = timeout, 288 .ssn = start_seq_num, 289 }; 290 int i, ret = -EOPNOTSUPP; 291 u16 status = WLAN_STATUS_REQUEST_DECLINED; 292 u16 max_buf_size; 293 294 lockdep_assert_wiphy(sta->local->hw.wiphy); 295 296 if (tid >= IEEE80211_FIRST_TSPEC_TSID) { 297 ht_dbg(sta->sdata, 298 "STA %pM requests BA session on unsupported tid %d\n", 299 sta->sta.addr, tid); 300 goto end; 301 } 302 303 if (!sta->sta.valid_links && 304 !sta->sta.deflink.ht_cap.ht_supported && 305 !sta->sta.deflink.he_cap.has_he && 306 !sta->sta.deflink.s1g_cap.s1g) { 307 ht_dbg(sta->sdata, 308 "STA %pM erroneously requests BA session on tid %d w/o HT\n", 309 sta->sta.addr, tid); 310 /* send a response anyway, it's an error case if we get here */ 311 goto end; 312 } 313 314 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { 315 ht_dbg(sta->sdata, 316 "Suspend in progress - Denying ADDBA request (%pM tid %d)\n", 317 sta->sta.addr, tid); 318 goto end; 319 } 320 321 if (sta->sta.valid_links || sta->sta.deflink.eht_cap.has_eht) 322 max_buf_size = IEEE80211_MAX_AMPDU_BUF_EHT; 323 else if (sta->sta.deflink.he_cap.has_he) 324 max_buf_size = IEEE80211_MAX_AMPDU_BUF_HE; 325 else 326 max_buf_size = IEEE80211_MAX_AMPDU_BUF_HT; 327 328 /* sanity check for incoming parameters: 329 * check if configuration can support the BA policy 330 * and if buffer size does not exceeds max value */ 331 /* XXX: check own ht delayed BA capability?? */ 332 if (((ba_policy != 1) && 333 (sta->sta.valid_links || 334 !(sta->sta.deflink.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA) || 335 !(sta->sta.deflink.s1g_cap.cap[3] & S1G_CAP3_HT_DELAYED_BA))) || 336 (buf_size > max_buf_size)) { 337 status = WLAN_STATUS_INVALID_QOS_PARAM; 338 ht_dbg_ratelimited(sta->sdata, 339 "AddBA Req with bad params from %pM on tid %u. policy %d, buffer size %d\n", 340 sta->sta.addr, tid, ba_policy, buf_size); 341 goto end; 342 } 343 /* determine default buffer size */ 344 if (buf_size == 0) 345 buf_size = max_buf_size; 346 347 /* make sure the size doesn't exceed the maximum supported by the hw */ 348 if (buf_size > sta->sta.max_rx_aggregation_subframes) 349 buf_size = sta->sta.max_rx_aggregation_subframes; 350 params.buf_size = buf_size; 351 352 ht_dbg(sta->sdata, "AddBA Req buf_size=%d for %pM\n", 353 buf_size, sta->sta.addr); 354 355 if (test_bit(tid, sta->ampdu_mlme.agg_session_valid)) { 356 if (sta->ampdu_mlme.tid_rx_token[tid] == dialog_token) { 357 struct tid_ampdu_rx *tid_rx; 358 359 ht_dbg_ratelimited(sta->sdata, 360 "updated AddBA Req from %pM on tid %u\n", 361 sta->sta.addr, tid); 362 /* We have no API to update the timeout value in the 363 * driver so reject the timeout update if the timeout 364 * changed. If it did not change, i.e., no real update, 365 * just reply with success. 366 */ 367 rcu_read_lock(); 368 tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 369 if (tid_rx && tid_rx->timeout == timeout) 370 status = WLAN_STATUS_SUCCESS; 371 else 372 status = WLAN_STATUS_REQUEST_DECLINED; 373 rcu_read_unlock(); 374 goto end; 375 } 376 377 ht_dbg_ratelimited(sta->sdata, 378 "unexpected AddBA Req from %pM on tid %u\n", 379 sta->sta.addr, tid); 380 381 /* delete existing Rx BA session on the same tid */ 382 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, 383 WLAN_STATUS_UNSPECIFIED_QOS, 384 false); 385 } 386 387 if (ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) { 388 ret = drv_ampdu_action(local, sta->sdata, ¶ms); 389 ht_dbg(sta->sdata, 390 "Rx A-MPDU request on %pM tid %d result %d\n", 391 sta->sta.addr, tid, ret); 392 if (!ret) 393 status = WLAN_STATUS_SUCCESS; 394 goto end; 395 } 396 397 /* prepare A-MPDU MLME for Rx aggregation */ 398 tid_agg_rx = kzalloc(sizeof(*tid_agg_rx), GFP_KERNEL); 399 if (!tid_agg_rx) 400 goto end; 401 402 spin_lock_init(&tid_agg_rx->reorder_lock); 403 404 /* rx timer */ 405 timer_setup(&tid_agg_rx->session_timer, 406 sta_rx_agg_session_timer_expired, TIMER_DEFERRABLE); 407 408 /* rx reorder timer */ 409 timer_setup(&tid_agg_rx->reorder_timer, 410 sta_rx_agg_reorder_timer_expired, 0); 411 412 /* prepare reordering buffer */ 413 tid_agg_rx->reorder_buf = 414 kcalloc(buf_size, sizeof(struct sk_buff_head), GFP_KERNEL); 415 tid_agg_rx->reorder_time = 416 kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL); 417 if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) { 418 kfree(tid_agg_rx->reorder_buf); 419 kfree(tid_agg_rx->reorder_time); 420 kfree(tid_agg_rx); 421 goto end; 422 } 423 424 for (i = 0; i < buf_size; i++) 425 __skb_queue_head_init(&tid_agg_rx->reorder_buf[i]); 426 427 ret = drv_ampdu_action(local, sta->sdata, ¶ms); 428 ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n", 429 sta->sta.addr, tid, ret); 430 if (ret) { 431 kfree(tid_agg_rx->reorder_buf); 432 kfree(tid_agg_rx->reorder_time); 433 kfree(tid_agg_rx); 434 goto end; 435 } 436 437 /* update data */ 438 tid_agg_rx->ssn = start_seq_num; 439 tid_agg_rx->head_seq_num = start_seq_num; 440 tid_agg_rx->buf_size = buf_size; 441 tid_agg_rx->timeout = timeout; 442 tid_agg_rx->stored_mpdu_num = 0; 443 tid_agg_rx->auto_seq = auto_seq; 444 tid_agg_rx->started = false; 445 tid_agg_rx->reorder_buf_filtered = 0; 446 tid_agg_rx->tid = tid; 447 tid_agg_rx->sta = sta; 448 status = WLAN_STATUS_SUCCESS; 449 450 /* activate it for RX */ 451 rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx); 452 453 if (timeout) { 454 mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout)); 455 tid_agg_rx->last_rx = jiffies; 456 } 457 458 end: 459 if (status == WLAN_STATUS_SUCCESS) { 460 __set_bit(tid, sta->ampdu_mlme.agg_session_valid); 461 __clear_bit(tid, sta->ampdu_mlme.unexpected_agg); 462 sta->ampdu_mlme.tid_rx_token[tid] = dialog_token; 463 } 464 465 if (tx) 466 ieee80211_send_addba_resp(sta, sta->sta.addr, tid, 467 dialog_token, status, 1, buf_size, 468 timeout, addba_ext_data); 469 } 470 471 void ieee80211_process_addba_request(struct ieee80211_local *local, 472 struct sta_info *sta, 473 struct ieee80211_mgmt *mgmt, 474 size_t len) 475 { 476 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num; 477 u8 dialog_token, addba_ext_data; 478 479 /* extract session parameters from addba request frame */ 480 dialog_token = mgmt->u.action.u.addba_req.dialog_token; 481 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); 482 start_seq_num = 483 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; 484 485 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); 486 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; 487 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; 488 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; 489 490 addba_ext_data = 491 ieee80211_retrieve_addba_ext_data(sta, 492 mgmt->u.action.u.addba_req.variable, 493 len - 494 offsetof(typeof(*mgmt), 495 u.action.u.addba_req.variable), 496 &buf_size); 497 498 __ieee80211_start_rx_ba_session(sta, dialog_token, timeout, 499 start_seq_num, ba_policy, tid, 500 buf_size, true, false, addba_ext_data); 501 } 502 503 void ieee80211_manage_rx_ba_offl(struct ieee80211_vif *vif, 504 const u8 *addr, unsigned int tid) 505 { 506 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 507 struct sta_info *sta; 508 509 rcu_read_lock(); 510 sta = sta_info_get_bss(sdata, addr); 511 if (!sta) 512 goto unlock; 513 514 set_bit(tid, sta->ampdu_mlme.tid_rx_manage_offl); 515 wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 516 unlock: 517 rcu_read_unlock(); 518 } 519 EXPORT_SYMBOL(ieee80211_manage_rx_ba_offl); 520 521 void ieee80211_rx_ba_timer_expired(struct ieee80211_vif *vif, 522 const u8 *addr, unsigned int tid) 523 { 524 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 525 struct sta_info *sta; 526 527 rcu_read_lock(); 528 sta = sta_info_get_bss(sdata, addr); 529 if (!sta) 530 goto unlock; 531 532 set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired); 533 wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 534 535 unlock: 536 rcu_read_unlock(); 537 } 538 EXPORT_SYMBOL(ieee80211_rx_ba_timer_expired); 539