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