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) 2018-2026 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 ieee80211_s1g_use_ndp_ba(sta->sdata, sta)); 99 100 /* 101 * return here in case tid_rx is not assigned - which will happen if 102 * IEEE80211_HW_SUPPORTS_REORDERING_BUFFER is set. 103 */ 104 if (!tid_rx) 105 return; 106 107 timer_delete_sync(&tid_rx->session_timer); 108 109 /* make sure ieee80211_sta_reorder_release() doesn't re-arm the timer */ 110 spin_lock_bh(&tid_rx->reorder_lock); 111 tid_rx->removed = true; 112 spin_unlock_bh(&tid_rx->reorder_lock); 113 timer_delete_sync(&tid_rx->reorder_timer); 114 115 call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx); 116 } 117 118 void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap, 119 const u8 *addr) 120 { 121 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 122 struct sta_info *sta; 123 int i; 124 125 rcu_read_lock(); 126 sta = sta_info_get_bss(sdata, addr); 127 if (!sta) { 128 rcu_read_unlock(); 129 return; 130 } 131 132 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 133 if (ba_rx_bitmap & BIT(i)) 134 set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested); 135 136 wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 137 rcu_read_unlock(); 138 } 139 EXPORT_SYMBOL(ieee80211_stop_rx_ba_session); 140 141 /* 142 * After accepting the AddBA Request we activated a timer, 143 * resetting it after each frame that arrives from the originator. 144 */ 145 static void sta_rx_agg_session_timer_expired(struct timer_list *t) 146 { 147 struct tid_ampdu_rx *tid_rx = timer_container_of(tid_rx, t, 148 session_timer); 149 struct sta_info *sta = tid_rx->sta; 150 u8 tid = tid_rx->tid; 151 unsigned long timeout; 152 153 timeout = tid_rx->last_rx + TU_TO_JIFFIES(tid_rx->timeout); 154 if (time_is_after_jiffies(timeout)) { 155 mod_timer(&tid_rx->session_timer, timeout); 156 return; 157 } 158 159 ht_dbg(sta->sdata, "RX session timer expired on %pM tid %d\n", 160 sta->sta.addr, tid); 161 162 set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired); 163 wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 164 } 165 166 static void sta_rx_agg_reorder_timer_expired(struct timer_list *t) 167 { 168 struct tid_ampdu_rx *tid_rx = timer_container_of(tid_rx, t, 169 reorder_timer); 170 171 rcu_read_lock(); 172 ieee80211_release_reorder_timeout(tid_rx->sta, tid_rx->tid); 173 rcu_read_unlock(); 174 } 175 176 void ieee80211_add_addbaext(struct sk_buff *skb, 177 const u8 req_addba_ext_data, 178 u16 buf_size) 179 { 180 struct ieee80211_addba_ext_ie *addba_ext; 181 u8 *pos; 182 183 pos = skb_put_zero(skb, 2 + sizeof(struct ieee80211_addba_ext_ie)); 184 *pos++ = WLAN_EID_ADDBA_EXT; 185 *pos++ = sizeof(struct ieee80211_addba_ext_ie); 186 addba_ext = (struct ieee80211_addba_ext_ie *)pos; 187 188 addba_ext->data = IEEE80211_ADDBA_EXT_NO_FRAG; 189 if (req_addba_ext_data) 190 addba_ext->data &= req_addba_ext_data; 191 192 addba_ext->data |= 193 u8_encode_bits(buf_size >> IEEE80211_ADDBA_EXT_BUF_SIZE_SHIFT, 194 IEEE80211_ADDBA_EXT_BUF_SIZE_MASK); 195 } 196 197 u8 ieee80211_retrieve_addba_ext_data(struct sta_info *sta, 198 const void *elem_data, ssize_t elem_len, 199 u16 *buf_size) 200 { 201 struct ieee802_11_elems *elems; 202 u8 buf_size_1k, data = 0; 203 204 if (!sta->sta.deflink.he_cap.has_he) 205 return 0; 206 207 if (elem_len <= 0) 208 return 0; 209 210 elems = ieee802_11_parse_elems(elem_data, elem_len, 211 IEEE80211_FTYPE_MGMT | 212 IEEE80211_STYPE_ACTION, 213 NULL); 214 215 if (!elems || elems->parse_error || !elems->addba_ext_ie) 216 goto free; 217 218 data = elems->addba_ext_ie->data; 219 220 if (buf_size && 221 (sta->sta.valid_links || sta->sta.deflink.eht_cap.has_eht)) { 222 buf_size_1k = u8_get_bits(elems->addba_ext_ie->data, 223 IEEE80211_ADDBA_EXT_BUF_SIZE_MASK); 224 *buf_size |= (u16)buf_size_1k << 225 IEEE80211_ADDBA_EXT_BUF_SIZE_SHIFT; 226 } 227 228 free: 229 kfree(elems); 230 231 return data; 232 } 233 234 static void ieee80211_send_addba_resp(struct sta_info *sta, u8 *da, u16 tid, 235 u8 dialog_token, u16 status, u16 policy, 236 u16 buf_size, u16 timeout, 237 const u8 req_addba_ext_data) 238 { 239 struct ieee80211_sub_if_data *sdata = sta->sdata; 240 struct ieee80211_local *local = sdata->local; 241 struct sk_buff *skb; 242 struct ieee80211_mgmt *mgmt; 243 bool amsdu = ieee80211_hw_check(&local->hw, SUPPORTS_AMSDU_IN_AMPDU); 244 bool use_ndp = ieee80211_s1g_use_ndp_ba(sdata, sta); 245 u16 capab; 246 247 skb = dev_alloc_skb(sizeof(*mgmt) + 248 2 + sizeof(struct ieee80211_addba_ext_ie) + 249 local->hw.extra_tx_headroom); 250 if (!skb) 251 return; 252 253 skb_reserve(skb, local->hw.extra_tx_headroom); 254 mgmt = ieee80211_mgmt_ba(skb, da, sdata); 255 256 skb_put(skb, 2 + sizeof(mgmt->u.action.addba_resp)); 257 mgmt->u.action.category = WLAN_CATEGORY_BACK; 258 mgmt->u.action.action_code = use_ndp ? 259 WLAN_ACTION_NDP_ADDBA_RESP : WLAN_ACTION_ADDBA_RESP; 260 261 mgmt->u.action.addba_resp.dialog_token = dialog_token; 262 263 capab = u16_encode_bits(amsdu, IEEE80211_ADDBA_PARAM_AMSDU_MASK); 264 capab |= u16_encode_bits(policy, IEEE80211_ADDBA_PARAM_POLICY_MASK); 265 capab |= u16_encode_bits(tid, IEEE80211_ADDBA_PARAM_TID_MASK); 266 capab |= u16_encode_bits(buf_size, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK); 267 268 mgmt->u.action.addba_resp.capab = cpu_to_le16(capab); 269 mgmt->u.action.addba_resp.timeout = cpu_to_le16(timeout); 270 mgmt->u.action.addba_resp.status = cpu_to_le16(status); 271 272 if (sta->sta.valid_links || sta->sta.deflink.he_cap.has_he) 273 ieee80211_add_addbaext(skb, req_addba_ext_data, buf_size); 274 275 ieee80211_tx_skb(sdata, skb); 276 } 277 278 void __ieee80211_start_rx_ba_session(struct sta_info *sta, 279 u8 dialog_token, u16 timeout, 280 u16 start_seq_num, u16 ba_policy, u16 tid, 281 u16 buf_size, bool tx, bool auto_seq, 282 bool req_ndp, 283 const u8 addba_ext_data) 284 { 285 struct ieee80211_local *local = sta->sdata->local; 286 struct tid_ampdu_rx *tid_agg_rx; 287 struct ieee80211_ampdu_params params = { 288 .sta = &sta->sta, 289 .action = IEEE80211_AMPDU_RX_START, 290 .tid = tid, 291 .amsdu = false, 292 .timeout = timeout, 293 .ssn = start_seq_num, 294 }; 295 int i, ret = -EOPNOTSUPP; 296 u16 status = WLAN_STATUS_REQUEST_DECLINED; 297 u16 max_buf_size; 298 299 lockdep_assert_wiphy(sta->local->hw.wiphy); 300 301 if (tid >= IEEE80211_FIRST_TSPEC_TSID) { 302 ht_dbg(sta->sdata, 303 "STA %pM requests BA session on unsupported tid %d\n", 304 sta->sta.addr, tid); 305 goto end; 306 } 307 308 if (tx && ieee80211_s1g_use_ndp_ba(sta->sdata, sta) && !req_ndp) { 309 /* 310 * According to IEEE 802.11-2024: Inform S1G originator 311 * ADDBA rejected as NDP BlockAck is preferred 312 */ 313 status = WLAN_STATUS_REJECTED_NDP_BLOCK_ACK_SUGGESTED; 314 ht_dbg(sta->sdata, 315 "Rejecting AddBA Req from %pM tid %u - require NDP BlockAck\n", 316 sta->sta.addr, tid); 317 goto end; 318 } 319 320 if (!sta->sta.valid_links && 321 !sta->sta.deflink.ht_cap.ht_supported && 322 !sta->sta.deflink.he_cap.has_he && 323 !sta->sta.deflink.s1g_cap.s1g) { 324 ht_dbg(sta->sdata, 325 "STA %pM erroneously requests BA session on tid %d w/o HT\n", 326 sta->sta.addr, tid); 327 /* send a response anyway, it's an error case if we get here */ 328 goto end; 329 } 330 331 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { 332 ht_dbg(sta->sdata, 333 "Suspend in progress - Denying ADDBA request (%pM tid %d)\n", 334 sta->sta.addr, tid); 335 goto end; 336 } 337 338 if (sta->sta.valid_links || sta->sta.deflink.eht_cap.has_eht) 339 max_buf_size = IEEE80211_MAX_AMPDU_BUF_EHT; 340 else if (sta->sta.deflink.he_cap.has_he) 341 max_buf_size = IEEE80211_MAX_AMPDU_BUF_HE; 342 else 343 max_buf_size = IEEE80211_MAX_AMPDU_BUF_HT; 344 345 /* sanity check for incoming parameters: 346 * check if configuration can support the BA policy 347 * and if buffer size does not exceeds max value */ 348 /* XXX: check own ht delayed BA capability?? */ 349 if (((ba_policy != 1) && 350 (sta->sta.valid_links || 351 !(sta->sta.deflink.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA) || 352 !(sta->sta.deflink.s1g_cap.cap[3] & S1G_CAP3_HT_DELAYED_BA))) || 353 (buf_size > max_buf_size)) { 354 status = WLAN_STATUS_INVALID_QOS_PARAM; 355 ht_dbg_ratelimited(sta->sdata, 356 "AddBA Req with bad params from %pM on tid %u. policy %d, buffer size %d\n", 357 sta->sta.addr, tid, ba_policy, buf_size); 358 goto end; 359 } 360 /* determine default buffer size */ 361 if (buf_size == 0) 362 buf_size = max_buf_size; 363 364 /* make sure the size doesn't exceed the maximum supported by the hw */ 365 if (buf_size > sta->sta.max_rx_aggregation_subframes) 366 buf_size = sta->sta.max_rx_aggregation_subframes; 367 params.buf_size = buf_size; 368 369 ht_dbg(sta->sdata, "AddBA Req buf_size=%d for %pM\n", 370 buf_size, sta->sta.addr); 371 372 if (test_bit(tid, sta->ampdu_mlme.agg_session_valid)) { 373 if (sta->ampdu_mlme.tid_rx_token[tid] == dialog_token) { 374 struct tid_ampdu_rx *tid_rx; 375 376 ht_dbg_ratelimited(sta->sdata, 377 "updated AddBA Req from %pM on tid %u\n", 378 sta->sta.addr, tid); 379 /* We have no API to update the timeout value in the 380 * driver so reject the timeout update if the timeout 381 * changed. If it did not change, i.e., no real update, 382 * just reply with success. 383 */ 384 rcu_read_lock(); 385 tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 386 if (tid_rx && tid_rx->timeout == timeout) 387 status = WLAN_STATUS_SUCCESS; 388 else 389 status = WLAN_STATUS_REQUEST_DECLINED; 390 rcu_read_unlock(); 391 goto end; 392 } 393 394 ht_dbg_ratelimited(sta->sdata, 395 "unexpected AddBA Req from %pM on tid %u\n", 396 sta->sta.addr, tid); 397 398 /* delete existing Rx BA session on the same tid */ 399 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, 400 WLAN_STATUS_UNSPECIFIED_QOS, 401 false); 402 } 403 404 if (ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) { 405 ret = drv_ampdu_action(local, sta->sdata, ¶ms); 406 ht_dbg(sta->sdata, 407 "Rx A-MPDU request on %pM tid %d result %d\n", 408 sta->sta.addr, tid, ret); 409 if (!ret) 410 status = WLAN_STATUS_SUCCESS; 411 goto end; 412 } 413 414 /* prepare A-MPDU MLME for Rx aggregation */ 415 tid_agg_rx = kzalloc_obj(*tid_agg_rx); 416 if (!tid_agg_rx) 417 goto end; 418 419 spin_lock_init(&tid_agg_rx->reorder_lock); 420 421 /* rx timer */ 422 timer_setup(&tid_agg_rx->session_timer, 423 sta_rx_agg_session_timer_expired, TIMER_DEFERRABLE); 424 425 /* rx reorder timer */ 426 timer_setup(&tid_agg_rx->reorder_timer, 427 sta_rx_agg_reorder_timer_expired, 0); 428 429 /* prepare reordering buffer */ 430 tid_agg_rx->reorder_buf = 431 kzalloc_objs(struct sk_buff_head, buf_size); 432 tid_agg_rx->reorder_time = 433 kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL); 434 if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) { 435 kfree(tid_agg_rx->reorder_buf); 436 kfree(tid_agg_rx->reorder_time); 437 kfree(tid_agg_rx); 438 goto end; 439 } 440 441 for (i = 0; i < buf_size; i++) 442 __skb_queue_head_init(&tid_agg_rx->reorder_buf[i]); 443 444 ret = drv_ampdu_action(local, sta->sdata, ¶ms); 445 ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n", 446 sta->sta.addr, tid, ret); 447 if (ret) { 448 kfree(tid_agg_rx->reorder_buf); 449 kfree(tid_agg_rx->reorder_time); 450 kfree(tid_agg_rx); 451 goto end; 452 } 453 454 /* update data */ 455 tid_agg_rx->ssn = start_seq_num; 456 tid_agg_rx->head_seq_num = start_seq_num; 457 tid_agg_rx->buf_size = buf_size; 458 tid_agg_rx->timeout = timeout; 459 tid_agg_rx->stored_mpdu_num = 0; 460 tid_agg_rx->auto_seq = auto_seq; 461 tid_agg_rx->started = false; 462 tid_agg_rx->reorder_buf_filtered = 0; 463 tid_agg_rx->tid = tid; 464 tid_agg_rx->sta = sta; 465 status = WLAN_STATUS_SUCCESS; 466 467 /* activate it for RX */ 468 rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx); 469 470 if (timeout) { 471 mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout)); 472 tid_agg_rx->last_rx = jiffies; 473 } 474 475 end: 476 if (status == WLAN_STATUS_SUCCESS) { 477 __set_bit(tid, sta->ampdu_mlme.agg_session_valid); 478 __clear_bit(tid, sta->ampdu_mlme.unexpected_agg); 479 sta->ampdu_mlme.tid_rx_token[tid] = dialog_token; 480 } 481 482 if (tx) 483 ieee80211_send_addba_resp(sta, sta->sta.addr, tid, 484 dialog_token, status, 1, buf_size, 485 timeout, addba_ext_data); 486 } 487 488 void ieee80211_process_addba_request(struct ieee80211_local *local, 489 struct sta_info *sta, 490 struct ieee80211_mgmt *mgmt, 491 size_t len) 492 { 493 bool req_ndp = mgmt->u.action.action_code == WLAN_ACTION_NDP_ADDBA_REQ; 494 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num; 495 u8 dialog_token, addba_ext_data; 496 497 /* extract session parameters from addba request frame */ 498 dialog_token = mgmt->u.action.addba_req.dialog_token; 499 timeout = le16_to_cpu(mgmt->u.action.addba_req.timeout); 500 start_seq_num = 501 le16_to_cpu(mgmt->u.action.addba_req.start_seq_num) >> 4; 502 503 capab = le16_to_cpu(mgmt->u.action.addba_req.capab); 504 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; 505 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; 506 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; 507 508 addba_ext_data = 509 ieee80211_retrieve_addba_ext_data(sta, 510 mgmt->u.action.addba_req.variable, 511 len - 512 offsetof(typeof(*mgmt), 513 u.action.addba_req.variable), 514 &buf_size); 515 516 __ieee80211_start_rx_ba_session(sta, dialog_token, timeout, 517 start_seq_num, ba_policy, tid, 518 buf_size, true, false, 519 req_ndp, addba_ext_data); 520 } 521 522 void ieee80211_manage_rx_ba_offl(struct ieee80211_vif *vif, 523 const u8 *addr, unsigned int tid) 524 { 525 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 526 struct sta_info *sta; 527 528 rcu_read_lock(); 529 sta = sta_info_get_bss(sdata, addr); 530 if (!sta) 531 goto unlock; 532 533 set_bit(tid, sta->ampdu_mlme.tid_rx_manage_offl); 534 wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 535 unlock: 536 rcu_read_unlock(); 537 } 538 EXPORT_SYMBOL(ieee80211_manage_rx_ba_offl); 539 540 void ieee80211_rx_ba_timer_expired(struct ieee80211_vif *vif, 541 const u8 *addr, unsigned int tid) 542 { 543 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 544 struct sta_info *sta; 545 546 rcu_read_lock(); 547 sta = sta_info_get_bss(sdata, addr); 548 if (!sta) 549 goto unlock; 550 551 set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired); 552 wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 553 554 unlock: 555 rcu_read_unlock(); 556 } 557 EXPORT_SYMBOL(ieee80211_rx_ba_timer_expired); 558