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[i].buf); 53 kfree(tid_rx); 54 } 55 56 void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, 57 u16 initiator, u16 reason, bool tx) 58 { 59 struct ieee80211_local *local = sta->local; 60 struct tid_ampdu_rx *tid_rx; 61 struct ieee80211_ampdu_params params = { 62 .sta = &sta->sta, 63 .action = IEEE80211_AMPDU_RX_STOP, 64 .tid = tid, 65 .amsdu = false, 66 .timeout = 0, 67 .ssn = 0, 68 }; 69 70 lockdep_assert_wiphy(sta->local->hw.wiphy); 71 72 tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid], 73 lockdep_is_held(&sta->local->hw.wiphy->mtx)); 74 75 if (!test_bit(tid, sta->ampdu_mlme.agg_session_valid)) 76 return; 77 78 RCU_INIT_POINTER(sta->ampdu_mlme.tid_rx[tid], NULL); 79 __clear_bit(tid, sta->ampdu_mlme.agg_session_valid); 80 81 ht_dbg(sta->sdata, 82 "Rx BA session stop requested for %pM tid %u %s reason: %d\n", 83 sta->sta.addr, tid, 84 initiator == WLAN_BACK_RECIPIENT ? "recipient" : "initiator", 85 (int)reason); 86 87 if (drv_ampdu_action(local, sta->sdata, ¶ms)) 88 sdata_info(sta->sdata, 89 "HW problem - can not stop rx aggregation for %pM tid %d\n", 90 sta->sta.addr, tid); 91 92 /* check if this is a self generated aggregation halt */ 93 if (initiator == WLAN_BACK_RECIPIENT && tx) 94 ieee80211_send_delba(sta->sdata, sta->sta.addr, 95 tid, WLAN_BACK_RECIPIENT, reason, 96 ieee80211_s1g_use_ndp_ba(sta->sdata, sta)); 97 98 /* 99 * return here in case tid_rx is not assigned - which will happen if 100 * IEEE80211_HW_SUPPORTS_REORDERING_BUFFER is set. 101 */ 102 if (!tid_rx) 103 return; 104 105 timer_delete_sync(&tid_rx->session_timer); 106 107 /* make sure ieee80211_sta_reorder_release() doesn't re-arm the timer */ 108 spin_lock_bh(&tid_rx->reorder_lock); 109 tid_rx->removed = true; 110 spin_unlock_bh(&tid_rx->reorder_lock); 111 timer_delete_sync(&tid_rx->reorder_timer); 112 113 call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx); 114 } 115 116 void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap, 117 const u8 *addr) 118 { 119 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 120 struct sta_info *sta; 121 int i; 122 123 rcu_read_lock(); 124 sta = sta_info_get_bss(sdata, addr); 125 if (!sta) { 126 rcu_read_unlock(); 127 return; 128 } 129 130 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 131 if (ba_rx_bitmap & BIT(i)) 132 set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested); 133 134 wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 135 rcu_read_unlock(); 136 } 137 EXPORT_SYMBOL(ieee80211_stop_rx_ba_session); 138 139 /* 140 * After accepting the AddBA Request we activated a timer, 141 * resetting it after each frame that arrives from the originator. 142 */ 143 static void sta_rx_agg_session_timer_expired(struct timer_list *t) 144 { 145 struct tid_ampdu_rx *tid_rx = timer_container_of(tid_rx, t, 146 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 = timer_container_of(tid_rx, t, 167 reorder_timer); 168 169 rcu_read_lock(); 170 ieee80211_release_reorder_timeout(tid_rx->sta, tid_rx->tid); 171 rcu_read_unlock(); 172 } 173 174 void ieee80211_add_addbaext(struct sk_buff *skb, 175 const u8 req_addba_ext_data, 176 u16 buf_size) 177 { 178 struct ieee80211_addba_ext_ie *addba_ext; 179 u8 *pos; 180 181 pos = skb_put_zero(skb, 2 + sizeof(struct ieee80211_addba_ext_ie)); 182 *pos++ = WLAN_EID_ADDBA_EXT; 183 *pos++ = sizeof(struct ieee80211_addba_ext_ie); 184 addba_ext = (struct ieee80211_addba_ext_ie *)pos; 185 186 addba_ext->data = IEEE80211_ADDBA_EXT_NO_FRAG; 187 if (req_addba_ext_data) 188 addba_ext->data &= req_addba_ext_data; 189 190 addba_ext->data |= 191 u8_encode_bits(buf_size >> IEEE80211_ADDBA_EXT_BUF_SIZE_SHIFT, 192 IEEE80211_ADDBA_EXT_BUF_SIZE_MASK); 193 } 194 195 u8 ieee80211_retrieve_addba_ext_data(struct sta_info *sta, 196 const void *elem_data, ssize_t elem_len, 197 u16 *buf_size) 198 { 199 struct ieee802_11_elems *elems; 200 u8 buf_size_1k, data = 0; 201 202 if (!sta->sta.deflink.he_cap.has_he) 203 return 0; 204 205 if (elem_len <= 0) 206 return 0; 207 208 elems = ieee802_11_parse_elems(elem_data, elem_len, 209 IEEE80211_FTYPE_MGMT | 210 IEEE80211_STYPE_ACTION, 211 NULL); 212 213 if (!elems || elems->parse_error || !elems->addba_ext_ie) 214 goto free; 215 216 data = elems->addba_ext_ie->data; 217 218 if (buf_size && 219 (sta->sta.valid_links || sta->sta.deflink.eht_cap.has_eht)) { 220 buf_size_1k = u8_get_bits(elems->addba_ext_ie->data, 221 IEEE80211_ADDBA_EXT_BUF_SIZE_MASK); 222 *buf_size |= (u16)buf_size_1k << 223 IEEE80211_ADDBA_EXT_BUF_SIZE_SHIFT; 224 } 225 226 free: 227 kfree(elems); 228 229 return data; 230 } 231 232 static void ieee80211_send_addba_resp(struct sta_info *sta, u8 *da, u16 tid, 233 u8 dialog_token, u16 status, u16 policy, 234 u16 buf_size, u16 timeout, 235 const u8 req_addba_ext_data) 236 { 237 struct ieee80211_sub_if_data *sdata = sta->sdata; 238 struct ieee80211_local *local = sdata->local; 239 struct sk_buff *skb; 240 struct ieee80211_mgmt *mgmt; 241 bool amsdu = ieee80211_hw_check(&local->hw, SUPPORTS_AMSDU_IN_AMPDU); 242 bool use_ndp = ieee80211_s1g_use_ndp_ba(sdata, sta); 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, 2 + sizeof(mgmt->u.action.addba_resp)); 255 mgmt->u.action.category = WLAN_CATEGORY_BACK; 256 mgmt->u.action.action_code = use_ndp ? 257 WLAN_ACTION_NDP_ADDBA_RESP : WLAN_ACTION_ADDBA_RESP; 258 259 mgmt->u.action.addba_resp.dialog_token = dialog_token; 260 261 capab = u16_encode_bits(amsdu, IEEE80211_ADDBA_PARAM_AMSDU_MASK); 262 capab |= u16_encode_bits(policy, IEEE80211_ADDBA_PARAM_POLICY_MASK); 263 capab |= u16_encode_bits(tid, IEEE80211_ADDBA_PARAM_TID_MASK); 264 capab |= u16_encode_bits(buf_size, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK); 265 266 mgmt->u.action.addba_resp.capab = cpu_to_le16(capab); 267 mgmt->u.action.addba_resp.timeout = cpu_to_le16(timeout); 268 mgmt->u.action.addba_resp.status = cpu_to_le16(status); 269 270 if (sta->sta.valid_links || sta->sta.deflink.he_cap.has_he) 271 ieee80211_add_addbaext(skb, req_addba_ext_data, buf_size); 272 273 ieee80211_tx_skb(sdata, skb); 274 } 275 276 void __ieee80211_start_rx_ba_session(struct sta_info *sta, 277 u8 dialog_token, u16 timeout, 278 u16 start_seq_num, u16 ba_policy, u16 tid, 279 u16 buf_size, bool tx, bool auto_seq, 280 bool req_ndp, 281 const u8 addba_ext_data) 282 { 283 struct ieee80211_local *local = sta->sdata->local; 284 struct tid_ampdu_rx *tid_agg_rx; 285 struct ieee80211_ampdu_params params = { 286 .sta = &sta->sta, 287 .action = IEEE80211_AMPDU_RX_START, 288 .tid = tid, 289 .amsdu = false, 290 .timeout = timeout, 291 .ssn = start_seq_num, 292 }; 293 int i, ret = -EOPNOTSUPP; 294 u16 status = WLAN_STATUS_REQUEST_DECLINED; 295 u16 max_buf_size; 296 297 lockdep_assert_wiphy(sta->local->hw.wiphy); 298 299 if (tid >= IEEE80211_FIRST_TSPEC_TSID) { 300 ht_dbg(sta->sdata, 301 "STA %pM requests BA session on unsupported tid %d\n", 302 sta->sta.addr, tid); 303 goto end; 304 } 305 306 if (tx && ieee80211_s1g_use_ndp_ba(sta->sdata, sta) && !req_ndp) { 307 /* 308 * According to IEEE 802.11-2024: Inform S1G originator 309 * ADDBA rejected as NDP BlockAck is preferred 310 */ 311 status = WLAN_STATUS_REJECTED_NDP_BLOCK_ACK_SUGGESTED; 312 ht_dbg(sta->sdata, 313 "Rejecting AddBA Req from %pM tid %u - require NDP BlockAck\n", 314 sta->sta.addr, tid); 315 goto end; 316 } 317 318 if (!sta->sta.valid_links && 319 !sta->sta.deflink.ht_cap.ht_supported && 320 !sta->sta.deflink.he_cap.has_he && 321 !sta->sta.deflink.s1g_cap.s1g) { 322 ht_dbg(sta->sdata, 323 "STA %pM erroneously requests BA session on tid %d w/o HT\n", 324 sta->sta.addr, tid); 325 /* send a response anyway, it's an error case if we get here */ 326 goto end; 327 } 328 329 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { 330 ht_dbg(sta->sdata, 331 "Suspend in progress - Denying ADDBA request (%pM tid %d)\n", 332 sta->sta.addr, tid); 333 goto end; 334 } 335 336 if (sta->sta.valid_links || sta->sta.deflink.eht_cap.has_eht) 337 max_buf_size = IEEE80211_MAX_AMPDU_BUF_EHT; 338 else if (sta->sta.deflink.he_cap.has_he) 339 max_buf_size = IEEE80211_MAX_AMPDU_BUF_HE; 340 else 341 max_buf_size = IEEE80211_MAX_AMPDU_BUF_HT; 342 343 /* sanity check for incoming parameters: 344 * check if configuration can support the BA policy 345 * and if buffer size does not exceeds max value */ 346 /* XXX: check own ht delayed BA capability?? */ 347 if (((ba_policy != 1) && 348 (sta->sta.valid_links || 349 !(sta->sta.deflink.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA) || 350 !(sta->sta.deflink.s1g_cap.cap[3] & S1G_CAP3_HT_DELAYED_BA))) || 351 (buf_size > max_buf_size)) { 352 status = WLAN_STATUS_INVALID_QOS_PARAM; 353 ht_dbg_ratelimited(sta->sdata, 354 "AddBA Req with bad params from %pM on tid %u. policy %d, buffer size %d\n", 355 sta->sta.addr, tid, ba_policy, buf_size); 356 goto end; 357 } 358 /* determine default buffer size */ 359 if (buf_size == 0) 360 buf_size = max_buf_size; 361 362 /* make sure the size doesn't exceed the maximum supported by the hw */ 363 if (buf_size > sta->sta.max_rx_aggregation_subframes) 364 buf_size = sta->sta.max_rx_aggregation_subframes; 365 params.buf_size = buf_size; 366 367 ht_dbg(sta->sdata, "AddBA Req buf_size=%d for %pM\n", 368 buf_size, sta->sta.addr); 369 370 if (test_bit(tid, sta->ampdu_mlme.agg_session_valid)) { 371 if (sta->ampdu_mlme.tid_rx_token[tid] == dialog_token) { 372 struct tid_ampdu_rx *tid_rx; 373 374 ht_dbg_ratelimited(sta->sdata, 375 "updated AddBA Req from %pM on tid %u\n", 376 sta->sta.addr, tid); 377 /* We have no API to update the timeout value in the 378 * driver so reject the timeout update if the timeout 379 * changed. If it did not change, i.e., no real update, 380 * just reply with success. 381 */ 382 rcu_read_lock(); 383 tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 384 if (tid_rx && tid_rx->timeout == timeout) 385 status = WLAN_STATUS_SUCCESS; 386 else 387 status = WLAN_STATUS_REQUEST_DECLINED; 388 rcu_read_unlock(); 389 goto end; 390 } 391 392 ht_dbg_ratelimited(sta->sdata, 393 "unexpected AddBA Req from %pM on tid %u\n", 394 sta->sta.addr, tid); 395 396 /* delete existing Rx BA session on the same tid */ 397 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, 398 WLAN_STATUS_UNSPECIFIED_QOS, 399 false); 400 } 401 402 if (ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) { 403 ret = drv_ampdu_action(local, sta->sdata, ¶ms); 404 ht_dbg(sta->sdata, 405 "Rx A-MPDU request on %pM tid %d result %d\n", 406 sta->sta.addr, tid, ret); 407 if (!ret) 408 status = WLAN_STATUS_SUCCESS; 409 goto end; 410 } 411 412 /* prepare A-MPDU MLME for Rx aggregation */ 413 tid_agg_rx = kzalloc_flex(*tid_agg_rx, reorder, buf_size); 414 if (!tid_agg_rx) 415 goto end; 416 417 spin_lock_init(&tid_agg_rx->reorder_lock); 418 419 /* rx timer */ 420 timer_setup(&tid_agg_rx->session_timer, 421 sta_rx_agg_session_timer_expired, TIMER_DEFERRABLE); 422 423 /* rx reorder timer */ 424 timer_setup(&tid_agg_rx->reorder_timer, 425 sta_rx_agg_reorder_timer_expired, 0); 426 427 for (i = 0; i < buf_size; i++) 428 __skb_queue_head_init(&tid_agg_rx->reorder[i].buf); 429 430 ret = drv_ampdu_action(local, sta->sdata, ¶ms); 431 ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n", 432 sta->sta.addr, tid, ret); 433 if (ret) { 434 kfree(tid_agg_rx); 435 goto end; 436 } 437 438 /* update data */ 439 tid_agg_rx->ssn = start_seq_num; 440 tid_agg_rx->head_seq_num = start_seq_num; 441 tid_agg_rx->buf_size = buf_size; 442 tid_agg_rx->timeout = timeout; 443 tid_agg_rx->stored_mpdu_num = 0; 444 tid_agg_rx->auto_seq = auto_seq; 445 tid_agg_rx->started = false; 446 tid_agg_rx->reorder_buf_filtered = 0; 447 tid_agg_rx->tid = tid; 448 tid_agg_rx->sta = sta; 449 status = WLAN_STATUS_SUCCESS; 450 451 /* activate it for RX */ 452 rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx); 453 454 if (timeout) { 455 mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout)); 456 tid_agg_rx->last_rx = jiffies; 457 } 458 459 end: 460 if (status == WLAN_STATUS_SUCCESS) { 461 __set_bit(tid, sta->ampdu_mlme.agg_session_valid); 462 __clear_bit(tid, sta->ampdu_mlme.unexpected_agg); 463 sta->ampdu_mlme.tid_rx_token[tid] = dialog_token; 464 } 465 466 if (tx) 467 ieee80211_send_addba_resp(sta, sta->sta.addr, tid, 468 dialog_token, status, 1, buf_size, 469 timeout, addba_ext_data); 470 } 471 472 void ieee80211_process_addba_request(struct ieee80211_local *local, 473 struct sta_info *sta, 474 struct ieee80211_mgmt *mgmt, 475 size_t len) 476 { 477 bool req_ndp = mgmt->u.action.action_code == WLAN_ACTION_NDP_ADDBA_REQ; 478 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num; 479 u8 dialog_token, addba_ext_data; 480 481 /* extract session parameters from addba request frame */ 482 dialog_token = mgmt->u.action.addba_req.dialog_token; 483 timeout = le16_to_cpu(mgmt->u.action.addba_req.timeout); 484 start_seq_num = 485 le16_to_cpu(mgmt->u.action.addba_req.start_seq_num) >> 4; 486 487 capab = le16_to_cpu(mgmt->u.action.addba_req.capab); 488 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; 489 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; 490 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; 491 492 addba_ext_data = 493 ieee80211_retrieve_addba_ext_data(sta, 494 mgmt->u.action.addba_req.variable, 495 len - 496 offsetof(typeof(*mgmt), 497 u.action.addba_req.variable), 498 &buf_size); 499 500 __ieee80211_start_rx_ba_session(sta, dialog_token, timeout, 501 start_seq_num, ba_policy, tid, 502 buf_size, true, false, 503 req_ndp, addba_ext_data); 504 } 505 506 void ieee80211_manage_rx_ba_offl(struct ieee80211_vif *vif, 507 const u8 *addr, unsigned int tid) 508 { 509 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 510 struct sta_info *sta; 511 512 rcu_read_lock(); 513 sta = sta_info_get_bss(sdata, addr); 514 if (!sta) 515 goto unlock; 516 517 set_bit(tid, sta->ampdu_mlme.tid_rx_manage_offl); 518 wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 519 unlock: 520 rcu_read_unlock(); 521 } 522 EXPORT_SYMBOL(ieee80211_manage_rx_ba_offl); 523 524 void ieee80211_rx_ba_timer_expired(struct ieee80211_vif *vif, 525 const u8 *addr, unsigned int tid) 526 { 527 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 528 struct sta_info *sta; 529 530 rcu_read_lock(); 531 sta = sta_info_get_bss(sdata, addr); 532 if (!sta) 533 goto unlock; 534 535 set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired); 536 wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 537 538 unlock: 539 rcu_read_unlock(); 540 } 541 EXPORT_SYMBOL(ieee80211_rx_ba_timer_expired); 542