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) 2018-2024 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, true, NULL); 210 211 if (!elems || elems->parse_error || !elems->addba_ext_ie) 212 goto free; 213 214 data = elems->addba_ext_ie->data; 215 216 if (buf_size && 217 (sta->sta.valid_links || sta->sta.deflink.eht_cap.has_eht)) { 218 buf_size_1k = u8_get_bits(elems->addba_ext_ie->data, 219 IEEE80211_ADDBA_EXT_BUF_SIZE_MASK); 220 *buf_size |= (u16)buf_size_1k << 221 IEEE80211_ADDBA_EXT_BUF_SIZE_SHIFT; 222 } 223 224 free: 225 kfree(elems); 226 227 return data; 228 } 229 230 static void ieee80211_send_addba_resp(struct sta_info *sta, u8 *da, u16 tid, 231 u8 dialog_token, u16 status, u16 policy, 232 u16 buf_size, u16 timeout, 233 const u8 req_addba_ext_data) 234 { 235 struct ieee80211_sub_if_data *sdata = sta->sdata; 236 struct ieee80211_local *local = sdata->local; 237 struct sk_buff *skb; 238 struct ieee80211_mgmt *mgmt; 239 bool amsdu = ieee80211_hw_check(&local->hw, SUPPORTS_AMSDU_IN_AMPDU); 240 u16 capab; 241 242 skb = dev_alloc_skb(sizeof(*mgmt) + 243 2 + sizeof(struct ieee80211_addba_ext_ie) + 244 local->hw.extra_tx_headroom); 245 if (!skb) 246 return; 247 248 skb_reserve(skb, local->hw.extra_tx_headroom); 249 mgmt = ieee80211_mgmt_ba(skb, da, sdata); 250 251 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp)); 252 mgmt->u.action.category = WLAN_CATEGORY_BACK; 253 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; 254 mgmt->u.action.u.addba_resp.dialog_token = dialog_token; 255 256 capab = u16_encode_bits(amsdu, IEEE80211_ADDBA_PARAM_AMSDU_MASK); 257 capab |= u16_encode_bits(policy, IEEE80211_ADDBA_PARAM_POLICY_MASK); 258 capab |= u16_encode_bits(tid, IEEE80211_ADDBA_PARAM_TID_MASK); 259 capab |= u16_encode_bits(buf_size, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK); 260 261 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); 262 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); 263 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); 264 265 if (sta->sta.valid_links || sta->sta.deflink.he_cap.has_he) 266 ieee80211_add_addbaext(skb, req_addba_ext_data, buf_size); 267 268 ieee80211_tx_skb(sdata, skb); 269 } 270 271 void __ieee80211_start_rx_ba_session(struct sta_info *sta, 272 u8 dialog_token, u16 timeout, 273 u16 start_seq_num, u16 ba_policy, u16 tid, 274 u16 buf_size, bool tx, bool auto_seq, 275 const u8 addba_ext_data) 276 { 277 struct ieee80211_local *local = sta->sdata->local; 278 struct tid_ampdu_rx *tid_agg_rx; 279 struct ieee80211_ampdu_params params = { 280 .sta = &sta->sta, 281 .action = IEEE80211_AMPDU_RX_START, 282 .tid = tid, 283 .amsdu = false, 284 .timeout = timeout, 285 .ssn = start_seq_num, 286 }; 287 int i, ret = -EOPNOTSUPP; 288 u16 status = WLAN_STATUS_REQUEST_DECLINED; 289 u16 max_buf_size; 290 291 lockdep_assert_wiphy(sta->local->hw.wiphy); 292 293 if (tid >= IEEE80211_FIRST_TSPEC_TSID) { 294 ht_dbg(sta->sdata, 295 "STA %pM requests BA session on unsupported tid %d\n", 296 sta->sta.addr, tid); 297 goto end; 298 } 299 300 if (!sta->sta.valid_links && 301 !sta->sta.deflink.ht_cap.ht_supported && 302 !sta->sta.deflink.he_cap.has_he && 303 !sta->sta.deflink.s1g_cap.s1g) { 304 ht_dbg(sta->sdata, 305 "STA %pM erroneously requests BA session on tid %d w/o HT\n", 306 sta->sta.addr, tid); 307 /* send a response anyway, it's an error case if we get here */ 308 goto end; 309 } 310 311 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { 312 ht_dbg(sta->sdata, 313 "Suspend in progress - Denying ADDBA request (%pM tid %d)\n", 314 sta->sta.addr, tid); 315 goto end; 316 } 317 318 if (sta->sta.valid_links || sta->sta.deflink.eht_cap.has_eht) 319 max_buf_size = IEEE80211_MAX_AMPDU_BUF_EHT; 320 else if (sta->sta.deflink.he_cap.has_he) 321 max_buf_size = IEEE80211_MAX_AMPDU_BUF_HE; 322 else 323 max_buf_size = IEEE80211_MAX_AMPDU_BUF_HT; 324 325 /* sanity check for incoming parameters: 326 * check if configuration can support the BA policy 327 * and if buffer size does not exceeds max value */ 328 /* XXX: check own ht delayed BA capability?? */ 329 if (((ba_policy != 1) && 330 (sta->sta.valid_links || 331 !(sta->sta.deflink.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA) || 332 !(sta->sta.deflink.s1g_cap.cap[3] & S1G_CAP3_HT_DELAYED_BA))) || 333 (buf_size > max_buf_size)) { 334 status = WLAN_STATUS_INVALID_QOS_PARAM; 335 ht_dbg_ratelimited(sta->sdata, 336 "AddBA Req with bad params from %pM on tid %u. policy %d, buffer size %d\n", 337 sta->sta.addr, tid, ba_policy, buf_size); 338 goto end; 339 } 340 /* determine default buffer size */ 341 if (buf_size == 0) 342 buf_size = max_buf_size; 343 344 /* make sure the size doesn't exceed the maximum supported by the hw */ 345 if (buf_size > sta->sta.max_rx_aggregation_subframes) 346 buf_size = sta->sta.max_rx_aggregation_subframes; 347 params.buf_size = buf_size; 348 349 ht_dbg(sta->sdata, "AddBA Req buf_size=%d for %pM\n", 350 buf_size, sta->sta.addr); 351 352 if (test_bit(tid, sta->ampdu_mlme.agg_session_valid)) { 353 if (sta->ampdu_mlme.tid_rx_token[tid] == dialog_token) { 354 struct tid_ampdu_rx *tid_rx; 355 356 ht_dbg_ratelimited(sta->sdata, 357 "updated AddBA Req from %pM on tid %u\n", 358 sta->sta.addr, tid); 359 /* We have no API to update the timeout value in the 360 * driver so reject the timeout update if the timeout 361 * changed. If it did not change, i.e., no real update, 362 * just reply with success. 363 */ 364 rcu_read_lock(); 365 tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 366 if (tid_rx && tid_rx->timeout == timeout) 367 status = WLAN_STATUS_SUCCESS; 368 else 369 status = WLAN_STATUS_REQUEST_DECLINED; 370 rcu_read_unlock(); 371 goto end; 372 } 373 374 ht_dbg_ratelimited(sta->sdata, 375 "unexpected AddBA Req from %pM on tid %u\n", 376 sta->sta.addr, tid); 377 378 /* delete existing Rx BA session on the same tid */ 379 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, 380 WLAN_STATUS_UNSPECIFIED_QOS, 381 false); 382 } 383 384 if (ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) { 385 ret = drv_ampdu_action(local, sta->sdata, ¶ms); 386 ht_dbg(sta->sdata, 387 "Rx A-MPDU request on %pM tid %d result %d\n", 388 sta->sta.addr, tid, ret); 389 if (!ret) 390 status = WLAN_STATUS_SUCCESS; 391 goto end; 392 } 393 394 /* prepare A-MPDU MLME for Rx aggregation */ 395 tid_agg_rx = kzalloc(sizeof(*tid_agg_rx), GFP_KERNEL); 396 if (!tid_agg_rx) 397 goto end; 398 399 spin_lock_init(&tid_agg_rx->reorder_lock); 400 401 /* rx timer */ 402 timer_setup(&tid_agg_rx->session_timer, 403 sta_rx_agg_session_timer_expired, TIMER_DEFERRABLE); 404 405 /* rx reorder timer */ 406 timer_setup(&tid_agg_rx->reorder_timer, 407 sta_rx_agg_reorder_timer_expired, 0); 408 409 /* prepare reordering buffer */ 410 tid_agg_rx->reorder_buf = 411 kcalloc(buf_size, sizeof(struct sk_buff_head), GFP_KERNEL); 412 tid_agg_rx->reorder_time = 413 kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL); 414 if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) { 415 kfree(tid_agg_rx->reorder_buf); 416 kfree(tid_agg_rx->reorder_time); 417 kfree(tid_agg_rx); 418 goto end; 419 } 420 421 for (i = 0; i < buf_size; i++) 422 __skb_queue_head_init(&tid_agg_rx->reorder_buf[i]); 423 424 ret = drv_ampdu_action(local, sta->sdata, ¶ms); 425 ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n", 426 sta->sta.addr, tid, ret); 427 if (ret) { 428 kfree(tid_agg_rx->reorder_buf); 429 kfree(tid_agg_rx->reorder_time); 430 kfree(tid_agg_rx); 431 goto end; 432 } 433 434 /* update data */ 435 tid_agg_rx->ssn = start_seq_num; 436 tid_agg_rx->head_seq_num = start_seq_num; 437 tid_agg_rx->buf_size = buf_size; 438 tid_agg_rx->timeout = timeout; 439 tid_agg_rx->stored_mpdu_num = 0; 440 tid_agg_rx->auto_seq = auto_seq; 441 tid_agg_rx->started = false; 442 tid_agg_rx->reorder_buf_filtered = 0; 443 tid_agg_rx->tid = tid; 444 tid_agg_rx->sta = sta; 445 status = WLAN_STATUS_SUCCESS; 446 447 /* activate it for RX */ 448 rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx); 449 450 if (timeout) { 451 mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout)); 452 tid_agg_rx->last_rx = jiffies; 453 } 454 455 end: 456 if (status == WLAN_STATUS_SUCCESS) { 457 __set_bit(tid, sta->ampdu_mlme.agg_session_valid); 458 __clear_bit(tid, sta->ampdu_mlme.unexpected_agg); 459 sta->ampdu_mlme.tid_rx_token[tid] = dialog_token; 460 } 461 462 if (tx) 463 ieee80211_send_addba_resp(sta, sta->sta.addr, tid, 464 dialog_token, status, 1, buf_size, 465 timeout, addba_ext_data); 466 } 467 468 void ieee80211_process_addba_request(struct ieee80211_local *local, 469 struct sta_info *sta, 470 struct ieee80211_mgmt *mgmt, 471 size_t len) 472 { 473 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num; 474 u8 dialog_token, addba_ext_data; 475 476 /* extract session parameters from addba request frame */ 477 dialog_token = mgmt->u.action.u.addba_req.dialog_token; 478 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); 479 start_seq_num = 480 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; 481 482 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); 483 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; 484 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; 485 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; 486 487 addba_ext_data = 488 ieee80211_retrieve_addba_ext_data(sta, 489 mgmt->u.action.u.addba_req.variable, 490 len - 491 offsetof(typeof(*mgmt), 492 u.action.u.addba_req.variable), 493 &buf_size); 494 495 __ieee80211_start_rx_ba_session(sta, dialog_token, timeout, 496 start_seq_num, ba_policy, tid, 497 buf_size, true, false, addba_ext_data); 498 } 499 500 void ieee80211_manage_rx_ba_offl(struct ieee80211_vif *vif, 501 const u8 *addr, unsigned int tid) 502 { 503 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 504 struct sta_info *sta; 505 506 rcu_read_lock(); 507 sta = sta_info_get_bss(sdata, addr); 508 if (!sta) 509 goto unlock; 510 511 set_bit(tid, sta->ampdu_mlme.tid_rx_manage_offl); 512 wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 513 unlock: 514 rcu_read_unlock(); 515 } 516 EXPORT_SYMBOL(ieee80211_manage_rx_ba_offl); 517 518 void ieee80211_rx_ba_timer_expired(struct ieee80211_vif *vif, 519 const u8 *addr, unsigned int tid) 520 { 521 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 522 struct sta_info *sta; 523 524 rcu_read_lock(); 525 sta = sta_info_get_bss(sdata, addr); 526 if (!sta) 527 goto unlock; 528 529 set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired); 530 wiphy_work_queue(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 531 532 unlock: 533 rcu_read_unlock(); 534 } 535 EXPORT_SYMBOL(ieee80211_rx_ba_timer_expired); 536