1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 4 * Copyright 2013-2014 Intel Mobile Communications GmbH 5 * Copyright (C) 2015 - 2017 Intel Deutschland GmbH 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/module.h> 13 #include <linux/init.h> 14 #include <linux/etherdevice.h> 15 #include <linux/netdevice.h> 16 #include <linux/types.h> 17 #include <linux/slab.h> 18 #include <linux/skbuff.h> 19 #include <linux/if_arp.h> 20 #include <linux/timer.h> 21 #include <linux/rtnetlink.h> 22 23 #include <net/codel.h> 24 #include <net/mac80211.h> 25 #include "ieee80211_i.h" 26 #include "driver-ops.h" 27 #include "rate.h" 28 #include "sta_info.h" 29 #include "debugfs_sta.h" 30 #include "mesh.h" 31 #include "wme.h" 32 33 /** 34 * DOC: STA information lifetime rules 35 * 36 * STA info structures (&struct sta_info) are managed in a hash table 37 * for faster lookup and a list for iteration. They are managed using 38 * RCU, i.e. access to the list and hash table is protected by RCU. 39 * 40 * Upon allocating a STA info structure with sta_info_alloc(), the caller 41 * owns that structure. It must then insert it into the hash table using 42 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter 43 * case (which acquires an rcu read section but must not be called from 44 * within one) will the pointer still be valid after the call. Note that 45 * the caller may not do much with the STA info before inserting it, in 46 * particular, it may not start any mesh peer link management or add 47 * encryption keys. 48 * 49 * When the insertion fails (sta_info_insert()) returns non-zero), the 50 * structure will have been freed by sta_info_insert()! 51 * 52 * Station entries are added by mac80211 when you establish a link with a 53 * peer. This means different things for the different type of interfaces 54 * we support. For a regular station this mean we add the AP sta when we 55 * receive an association response from the AP. For IBSS this occurs when 56 * get to know about a peer on the same IBSS. For WDS we add the sta for 57 * the peer immediately upon device open. When using AP mode we add stations 58 * for each respective station upon request from userspace through nl80211. 59 * 60 * In order to remove a STA info structure, various sta_info_destroy_*() 61 * calls are available. 62 * 63 * There is no concept of ownership on a STA entry, each structure is 64 * owned by the global hash table/list until it is removed. All users of 65 * the structure need to be RCU protected so that the structure won't be 66 * freed before they are done using it. 67 */ 68 69 static const struct rhashtable_params sta_rht_params = { 70 .nelem_hint = 3, /* start small */ 71 .automatic_shrinking = true, 72 .head_offset = offsetof(struct sta_info, hash_node), 73 .key_offset = offsetof(struct sta_info, addr), 74 .key_len = ETH_ALEN, 75 .max_size = CONFIG_MAC80211_STA_HASH_MAX_SIZE, 76 }; 77 78 /* Caller must hold local->sta_mtx */ 79 static int sta_info_hash_del(struct ieee80211_local *local, 80 struct sta_info *sta) 81 { 82 return rhltable_remove(&local->sta_hash, &sta->hash_node, 83 sta_rht_params); 84 } 85 86 static void __cleanup_single_sta(struct sta_info *sta) 87 { 88 int ac, i; 89 struct tid_ampdu_tx *tid_tx; 90 struct ieee80211_sub_if_data *sdata = sta->sdata; 91 struct ieee80211_local *local = sdata->local; 92 struct fq *fq = &local->fq; 93 struct ps_data *ps; 94 95 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 96 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 97 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 98 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 99 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 100 ps = &sdata->bss->ps; 101 else if (ieee80211_vif_is_mesh(&sdata->vif)) 102 ps = &sdata->u.mesh.ps; 103 else 104 return; 105 106 clear_sta_flag(sta, WLAN_STA_PS_STA); 107 clear_sta_flag(sta, WLAN_STA_PS_DRIVER); 108 clear_sta_flag(sta, WLAN_STA_PS_DELIVER); 109 110 atomic_dec(&ps->num_sta_ps); 111 } 112 113 if (sta->sta.txq[0]) { 114 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) { 115 struct txq_info *txqi = to_txq_info(sta->sta.txq[i]); 116 117 spin_lock_bh(&fq->lock); 118 ieee80211_txq_purge(local, txqi); 119 spin_unlock_bh(&fq->lock); 120 } 121 } 122 123 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 124 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]); 125 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]); 126 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]); 127 } 128 129 if (ieee80211_vif_is_mesh(&sdata->vif)) 130 mesh_sta_cleanup(sta); 131 132 cancel_work_sync(&sta->drv_deliver_wk); 133 134 /* 135 * Destroy aggregation state here. It would be nice to wait for the 136 * driver to finish aggregation stop and then clean up, but for now 137 * drivers have to handle aggregation stop being requested, followed 138 * directly by station destruction. 139 */ 140 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 141 kfree(sta->ampdu_mlme.tid_start_tx[i]); 142 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]); 143 if (!tid_tx) 144 continue; 145 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending); 146 kfree(tid_tx); 147 } 148 } 149 150 static void cleanup_single_sta(struct sta_info *sta) 151 { 152 struct ieee80211_sub_if_data *sdata = sta->sdata; 153 struct ieee80211_local *local = sdata->local; 154 155 __cleanup_single_sta(sta); 156 sta_info_free(local, sta); 157 } 158 159 struct rhlist_head *sta_info_hash_lookup(struct ieee80211_local *local, 160 const u8 *addr) 161 { 162 return rhltable_lookup(&local->sta_hash, addr, sta_rht_params); 163 } 164 165 /* protected by RCU */ 166 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata, 167 const u8 *addr) 168 { 169 struct ieee80211_local *local = sdata->local; 170 struct rhlist_head *tmp; 171 struct sta_info *sta; 172 173 rcu_read_lock(); 174 for_each_sta_info(local, addr, sta, tmp) { 175 if (sta->sdata == sdata) { 176 rcu_read_unlock(); 177 /* this is safe as the caller must already hold 178 * another rcu read section or the mutex 179 */ 180 return sta; 181 } 182 } 183 rcu_read_unlock(); 184 return NULL; 185 } 186 187 /* 188 * Get sta info either from the specified interface 189 * or from one of its vlans 190 */ 191 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata, 192 const u8 *addr) 193 { 194 struct ieee80211_local *local = sdata->local; 195 struct rhlist_head *tmp; 196 struct sta_info *sta; 197 198 rcu_read_lock(); 199 for_each_sta_info(local, addr, sta, tmp) { 200 if (sta->sdata == sdata || 201 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) { 202 rcu_read_unlock(); 203 /* this is safe as the caller must already hold 204 * another rcu read section or the mutex 205 */ 206 return sta; 207 } 208 } 209 rcu_read_unlock(); 210 return NULL; 211 } 212 213 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, 214 int idx) 215 { 216 struct ieee80211_local *local = sdata->local; 217 struct sta_info *sta; 218 int i = 0; 219 220 list_for_each_entry_rcu(sta, &local->sta_list, list) { 221 if (sdata != sta->sdata) 222 continue; 223 if (i < idx) { 224 ++i; 225 continue; 226 } 227 return sta; 228 } 229 230 return NULL; 231 } 232 233 /** 234 * sta_info_free - free STA 235 * 236 * @local: pointer to the global information 237 * @sta: STA info to free 238 * 239 * This function must undo everything done by sta_info_alloc() 240 * that may happen before sta_info_insert(). It may only be 241 * called when sta_info_insert() has not been attempted (and 242 * if that fails, the station is freed anyway.) 243 */ 244 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta) 245 { 246 if (sta->rate_ctrl) 247 rate_control_free_sta(sta); 248 249 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr); 250 251 if (sta->sta.txq[0]) 252 kfree(to_txq_info(sta->sta.txq[0])); 253 kfree(rcu_dereference_raw(sta->sta.rates)); 254 #ifdef CONFIG_MAC80211_MESH 255 kfree(sta->mesh); 256 #endif 257 free_percpu(sta->pcpu_rx_stats); 258 kfree(sta); 259 } 260 261 /* Caller must hold local->sta_mtx */ 262 static int sta_info_hash_add(struct ieee80211_local *local, 263 struct sta_info *sta) 264 { 265 return rhltable_insert(&local->sta_hash, &sta->hash_node, 266 sta_rht_params); 267 } 268 269 static void sta_deliver_ps_frames(struct work_struct *wk) 270 { 271 struct sta_info *sta; 272 273 sta = container_of(wk, struct sta_info, drv_deliver_wk); 274 275 if (sta->dead) 276 return; 277 278 local_bh_disable(); 279 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) 280 ieee80211_sta_ps_deliver_wakeup(sta); 281 else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) 282 ieee80211_sta_ps_deliver_poll_response(sta); 283 else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) 284 ieee80211_sta_ps_deliver_uapsd(sta); 285 local_bh_enable(); 286 } 287 288 static int sta_prepare_rate_control(struct ieee80211_local *local, 289 struct sta_info *sta, gfp_t gfp) 290 { 291 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) 292 return 0; 293 294 sta->rate_ctrl = local->rate_ctrl; 295 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, 296 sta, gfp); 297 if (!sta->rate_ctrl_priv) 298 return -ENOMEM; 299 300 return 0; 301 } 302 303 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, 304 const u8 *addr, gfp_t gfp) 305 { 306 struct ieee80211_local *local = sdata->local; 307 struct ieee80211_hw *hw = &local->hw; 308 struct sta_info *sta; 309 int i; 310 311 sta = kzalloc(sizeof(*sta) + hw->sta_data_size, gfp); 312 if (!sta) 313 return NULL; 314 315 if (ieee80211_hw_check(hw, USES_RSS)) { 316 sta->pcpu_rx_stats = 317 alloc_percpu(struct ieee80211_sta_rx_stats); 318 if (!sta->pcpu_rx_stats) 319 goto free; 320 } 321 322 spin_lock_init(&sta->lock); 323 spin_lock_init(&sta->ps_lock); 324 INIT_WORK(&sta->drv_deliver_wk, sta_deliver_ps_frames); 325 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work); 326 mutex_init(&sta->ampdu_mlme.mtx); 327 #ifdef CONFIG_MAC80211_MESH 328 if (ieee80211_vif_is_mesh(&sdata->vif)) { 329 sta->mesh = kzalloc(sizeof(*sta->mesh), gfp); 330 if (!sta->mesh) 331 goto free; 332 sta->mesh->plink_sta = sta; 333 spin_lock_init(&sta->mesh->plink_lock); 334 if (ieee80211_vif_is_mesh(&sdata->vif) && 335 !sdata->u.mesh.user_mpm) 336 timer_setup(&sta->mesh->plink_timer, mesh_plink_timer, 337 0); 338 sta->mesh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE; 339 } 340 #endif 341 342 memcpy(sta->addr, addr, ETH_ALEN); 343 memcpy(sta->sta.addr, addr, ETH_ALEN); 344 sta->sta.max_rx_aggregation_subframes = 345 local->hw.max_rx_aggregation_subframes; 346 347 sta->local = local; 348 sta->sdata = sdata; 349 sta->rx_stats.last_rx = jiffies; 350 351 u64_stats_init(&sta->rx_stats.syncp); 352 353 sta->sta_state = IEEE80211_STA_NONE; 354 355 /* Mark TID as unreserved */ 356 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 357 358 sta->last_connected = ktime_get_seconds(); 359 ewma_signal_init(&sta->rx_stats_avg.signal); 360 for (i = 0; i < ARRAY_SIZE(sta->rx_stats_avg.chain_signal); i++) 361 ewma_signal_init(&sta->rx_stats_avg.chain_signal[i]); 362 363 if (local->ops->wake_tx_queue) { 364 void *txq_data; 365 int size = sizeof(struct txq_info) + 366 ALIGN(hw->txq_data_size, sizeof(void *)); 367 368 txq_data = kcalloc(ARRAY_SIZE(sta->sta.txq), size, gfp); 369 if (!txq_data) 370 goto free; 371 372 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) { 373 struct txq_info *txq = txq_data + i * size; 374 375 ieee80211_txq_init(sdata, sta, txq, i); 376 } 377 } 378 379 if (sta_prepare_rate_control(local, sta, gfp)) 380 goto free_txq; 381 382 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 383 skb_queue_head_init(&sta->ps_tx_buf[i]); 384 skb_queue_head_init(&sta->tx_filtered[i]); 385 } 386 387 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 388 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX); 389 390 sta->sta.smps_mode = IEEE80211_SMPS_OFF; 391 if (sdata->vif.type == NL80211_IFTYPE_AP || 392 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 393 struct ieee80211_supported_band *sband; 394 u8 smps; 395 396 sband = ieee80211_get_sband(sdata); 397 if (!sband) 398 goto free_txq; 399 400 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 401 IEEE80211_HT_CAP_SM_PS_SHIFT; 402 /* 403 * Assume that hostapd advertises our caps in the beacon and 404 * this is the known_smps_mode for a station that just assciated 405 */ 406 switch (smps) { 407 case WLAN_HT_SMPS_CONTROL_DISABLED: 408 sta->known_smps_mode = IEEE80211_SMPS_OFF; 409 break; 410 case WLAN_HT_SMPS_CONTROL_STATIC: 411 sta->known_smps_mode = IEEE80211_SMPS_STATIC; 412 break; 413 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 414 sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC; 415 break; 416 default: 417 WARN_ON(1); 418 } 419 } 420 421 sta->sta.max_rc_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_BA; 422 423 sta->cparams.ce_threshold = CODEL_DISABLED_THRESHOLD; 424 sta->cparams.target = MS2TIME(20); 425 sta->cparams.interval = MS2TIME(100); 426 sta->cparams.ecn = true; 427 428 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr); 429 430 return sta; 431 432 free_txq: 433 if (sta->sta.txq[0]) 434 kfree(to_txq_info(sta->sta.txq[0])); 435 free: 436 #ifdef CONFIG_MAC80211_MESH 437 kfree(sta->mesh); 438 #endif 439 kfree(sta); 440 return NULL; 441 } 442 443 static int sta_info_insert_check(struct sta_info *sta) 444 { 445 struct ieee80211_sub_if_data *sdata = sta->sdata; 446 447 /* 448 * Can't be a WARN_ON because it can be triggered through a race: 449 * something inserts a STA (on one CPU) without holding the RTNL 450 * and another CPU turns off the net device. 451 */ 452 if (unlikely(!ieee80211_sdata_running(sdata))) 453 return -ENETDOWN; 454 455 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) || 456 is_multicast_ether_addr(sta->sta.addr))) 457 return -EINVAL; 458 459 /* The RCU read lock is required by rhashtable due to 460 * asynchronous resize/rehash. We also require the mutex 461 * for correctness. 462 */ 463 rcu_read_lock(); 464 lockdep_assert_held(&sdata->local->sta_mtx); 465 if (ieee80211_hw_check(&sdata->local->hw, NEEDS_UNIQUE_STA_ADDR) && 466 ieee80211_find_sta_by_ifaddr(&sdata->local->hw, sta->addr, NULL)) { 467 rcu_read_unlock(); 468 return -ENOTUNIQ; 469 } 470 rcu_read_unlock(); 471 472 return 0; 473 } 474 475 static int sta_info_insert_drv_state(struct ieee80211_local *local, 476 struct ieee80211_sub_if_data *sdata, 477 struct sta_info *sta) 478 { 479 enum ieee80211_sta_state state; 480 int err = 0; 481 482 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) { 483 err = drv_sta_state(local, sdata, sta, state, state + 1); 484 if (err) 485 break; 486 } 487 488 if (!err) { 489 /* 490 * Drivers using legacy sta_add/sta_remove callbacks only 491 * get uploaded set to true after sta_add is called. 492 */ 493 if (!local->ops->sta_add) 494 sta->uploaded = true; 495 return 0; 496 } 497 498 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 499 sdata_info(sdata, 500 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n", 501 sta->sta.addr, state + 1, err); 502 err = 0; 503 } 504 505 /* unwind on error */ 506 for (; state > IEEE80211_STA_NOTEXIST; state--) 507 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1)); 508 509 return err; 510 } 511 512 static void 513 ieee80211_recalc_p2p_go_ps_allowed(struct ieee80211_sub_if_data *sdata) 514 { 515 struct ieee80211_local *local = sdata->local; 516 bool allow_p2p_go_ps = sdata->vif.p2p; 517 struct sta_info *sta; 518 519 rcu_read_lock(); 520 list_for_each_entry_rcu(sta, &local->sta_list, list) { 521 if (sdata != sta->sdata || 522 !test_sta_flag(sta, WLAN_STA_ASSOC)) 523 continue; 524 if (!sta->sta.support_p2p_ps) { 525 allow_p2p_go_ps = false; 526 break; 527 } 528 } 529 rcu_read_unlock(); 530 531 if (allow_p2p_go_ps != sdata->vif.bss_conf.allow_p2p_go_ps) { 532 sdata->vif.bss_conf.allow_p2p_go_ps = allow_p2p_go_ps; 533 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_P2P_PS); 534 } 535 } 536 537 /* 538 * should be called with sta_mtx locked 539 * this function replaces the mutex lock 540 * with a RCU lock 541 */ 542 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU) 543 { 544 struct ieee80211_local *local = sta->local; 545 struct ieee80211_sub_if_data *sdata = sta->sdata; 546 struct station_info *sinfo = NULL; 547 int err = 0; 548 549 lockdep_assert_held(&local->sta_mtx); 550 551 /* check if STA exists already */ 552 if (sta_info_get_bss(sdata, sta->sta.addr)) { 553 err = -EEXIST; 554 goto out_err; 555 } 556 557 sinfo = kzalloc(sizeof(struct station_info), GFP_KERNEL); 558 if (!sinfo) { 559 err = -ENOMEM; 560 goto out_err; 561 } 562 563 local->num_sta++; 564 local->sta_generation++; 565 smp_mb(); 566 567 /* simplify things and don't accept BA sessions yet */ 568 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 569 570 /* make the station visible */ 571 err = sta_info_hash_add(local, sta); 572 if (err) 573 goto out_drop_sta; 574 575 list_add_tail_rcu(&sta->list, &local->sta_list); 576 577 /* notify driver */ 578 err = sta_info_insert_drv_state(local, sdata, sta); 579 if (err) 580 goto out_remove; 581 582 set_sta_flag(sta, WLAN_STA_INSERTED); 583 584 if (sta->sta_state >= IEEE80211_STA_ASSOC) { 585 ieee80211_recalc_min_chandef(sta->sdata); 586 if (!sta->sta.support_p2p_ps) 587 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata); 588 } 589 590 /* accept BA sessions now */ 591 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 592 593 ieee80211_sta_debugfs_add(sta); 594 rate_control_add_sta_debugfs(sta); 595 596 sinfo->generation = local->sta_generation; 597 cfg80211_new_sta(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL); 598 kfree(sinfo); 599 600 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr); 601 602 /* move reference to rcu-protected */ 603 rcu_read_lock(); 604 mutex_unlock(&local->sta_mtx); 605 606 if (ieee80211_vif_is_mesh(&sdata->vif)) 607 mesh_accept_plinks_update(sdata); 608 609 return 0; 610 out_remove: 611 sta_info_hash_del(local, sta); 612 list_del_rcu(&sta->list); 613 out_drop_sta: 614 local->num_sta--; 615 synchronize_net(); 616 __cleanup_single_sta(sta); 617 out_err: 618 mutex_unlock(&local->sta_mtx); 619 kfree(sinfo); 620 rcu_read_lock(); 621 return err; 622 } 623 624 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU) 625 { 626 struct ieee80211_local *local = sta->local; 627 int err; 628 629 might_sleep(); 630 631 mutex_lock(&local->sta_mtx); 632 633 err = sta_info_insert_check(sta); 634 if (err) { 635 mutex_unlock(&local->sta_mtx); 636 rcu_read_lock(); 637 goto out_free; 638 } 639 640 err = sta_info_insert_finish(sta); 641 if (err) 642 goto out_free; 643 644 return 0; 645 out_free: 646 sta_info_free(local, sta); 647 return err; 648 } 649 650 int sta_info_insert(struct sta_info *sta) 651 { 652 int err = sta_info_insert_rcu(sta); 653 654 rcu_read_unlock(); 655 656 return err; 657 } 658 659 static inline void __bss_tim_set(u8 *tim, u16 id) 660 { 661 /* 662 * This format has been mandated by the IEEE specifications, 663 * so this line may not be changed to use the __set_bit() format. 664 */ 665 tim[id / 8] |= (1 << (id % 8)); 666 } 667 668 static inline void __bss_tim_clear(u8 *tim, u16 id) 669 { 670 /* 671 * This format has been mandated by the IEEE specifications, 672 * so this line may not be changed to use the __clear_bit() format. 673 */ 674 tim[id / 8] &= ~(1 << (id % 8)); 675 } 676 677 static inline bool __bss_tim_get(u8 *tim, u16 id) 678 { 679 /* 680 * This format has been mandated by the IEEE specifications, 681 * so this line may not be changed to use the test_bit() format. 682 */ 683 return tim[id / 8] & (1 << (id % 8)); 684 } 685 686 static unsigned long ieee80211_tids_for_ac(int ac) 687 { 688 /* If we ever support TIDs > 7, this obviously needs to be adjusted */ 689 switch (ac) { 690 case IEEE80211_AC_VO: 691 return BIT(6) | BIT(7); 692 case IEEE80211_AC_VI: 693 return BIT(4) | BIT(5); 694 case IEEE80211_AC_BE: 695 return BIT(0) | BIT(3); 696 case IEEE80211_AC_BK: 697 return BIT(1) | BIT(2); 698 default: 699 WARN_ON(1); 700 return 0; 701 } 702 } 703 704 static void __sta_info_recalc_tim(struct sta_info *sta, bool ignore_pending) 705 { 706 struct ieee80211_local *local = sta->local; 707 struct ps_data *ps; 708 bool indicate_tim = false; 709 u8 ignore_for_tim = sta->sta.uapsd_queues; 710 int ac; 711 u16 id = sta->sta.aid; 712 713 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 714 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 715 if (WARN_ON_ONCE(!sta->sdata->bss)) 716 return; 717 718 ps = &sta->sdata->bss->ps; 719 #ifdef CONFIG_MAC80211_MESH 720 } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) { 721 ps = &sta->sdata->u.mesh.ps; 722 #endif 723 } else { 724 return; 725 } 726 727 /* No need to do anything if the driver does all */ 728 if (ieee80211_hw_check(&local->hw, AP_LINK_PS) && !local->ops->set_tim) 729 return; 730 731 if (sta->dead) 732 goto done; 733 734 /* 735 * If all ACs are delivery-enabled then we should build 736 * the TIM bit for all ACs anyway; if only some are then 737 * we ignore those and build the TIM bit using only the 738 * non-enabled ones. 739 */ 740 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1) 741 ignore_for_tim = 0; 742 743 if (ignore_pending) 744 ignore_for_tim = BIT(IEEE80211_NUM_ACS) - 1; 745 746 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 747 unsigned long tids; 748 749 if (ignore_for_tim & ieee80211_ac_to_qos_mask[ac]) 750 continue; 751 752 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) || 753 !skb_queue_empty(&sta->ps_tx_buf[ac]); 754 if (indicate_tim) 755 break; 756 757 tids = ieee80211_tids_for_ac(ac); 758 759 indicate_tim |= 760 sta->driver_buffered_tids & tids; 761 indicate_tim |= 762 sta->txq_buffered_tids & tids; 763 } 764 765 done: 766 spin_lock_bh(&local->tim_lock); 767 768 if (indicate_tim == __bss_tim_get(ps->tim, id)) 769 goto out_unlock; 770 771 if (indicate_tim) 772 __bss_tim_set(ps->tim, id); 773 else 774 __bss_tim_clear(ps->tim, id); 775 776 if (local->ops->set_tim && !WARN_ON(sta->dead)) { 777 local->tim_in_locked_section = true; 778 drv_set_tim(local, &sta->sta, indicate_tim); 779 local->tim_in_locked_section = false; 780 } 781 782 out_unlock: 783 spin_unlock_bh(&local->tim_lock); 784 } 785 786 void sta_info_recalc_tim(struct sta_info *sta) 787 { 788 __sta_info_recalc_tim(sta, false); 789 } 790 791 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb) 792 { 793 struct ieee80211_tx_info *info; 794 int timeout; 795 796 if (!skb) 797 return false; 798 799 info = IEEE80211_SKB_CB(skb); 800 801 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ 802 timeout = (sta->listen_interval * 803 sta->sdata->vif.bss_conf.beacon_int * 804 32 / 15625) * HZ; 805 if (timeout < STA_TX_BUFFER_EXPIRE) 806 timeout = STA_TX_BUFFER_EXPIRE; 807 return time_after(jiffies, info->control.jiffies + timeout); 808 } 809 810 811 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local, 812 struct sta_info *sta, int ac) 813 { 814 unsigned long flags; 815 struct sk_buff *skb; 816 817 /* 818 * First check for frames that should expire on the filtered 819 * queue. Frames here were rejected by the driver and are on 820 * a separate queue to avoid reordering with normal PS-buffered 821 * frames. They also aren't accounted for right now in the 822 * total_ps_buffered counter. 823 */ 824 for (;;) { 825 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags); 826 skb = skb_peek(&sta->tx_filtered[ac]); 827 if (sta_info_buffer_expired(sta, skb)) 828 skb = __skb_dequeue(&sta->tx_filtered[ac]); 829 else 830 skb = NULL; 831 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags); 832 833 /* 834 * Frames are queued in order, so if this one 835 * hasn't expired yet we can stop testing. If 836 * we actually reached the end of the queue we 837 * also need to stop, of course. 838 */ 839 if (!skb) 840 break; 841 ieee80211_free_txskb(&local->hw, skb); 842 } 843 844 /* 845 * Now also check the normal PS-buffered queue, this will 846 * only find something if the filtered queue was emptied 847 * since the filtered frames are all before the normal PS 848 * buffered frames. 849 */ 850 for (;;) { 851 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags); 852 skb = skb_peek(&sta->ps_tx_buf[ac]); 853 if (sta_info_buffer_expired(sta, skb)) 854 skb = __skb_dequeue(&sta->ps_tx_buf[ac]); 855 else 856 skb = NULL; 857 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags); 858 859 /* 860 * frames are queued in order, so if this one 861 * hasn't expired yet (or we reached the end of 862 * the queue) we can stop testing 863 */ 864 if (!skb) 865 break; 866 867 local->total_ps_buffered--; 868 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n", 869 sta->sta.addr); 870 ieee80211_free_txskb(&local->hw, skb); 871 } 872 873 /* 874 * Finally, recalculate the TIM bit for this station -- it might 875 * now be clear because the station was too slow to retrieve its 876 * frames. 877 */ 878 sta_info_recalc_tim(sta); 879 880 /* 881 * Return whether there are any frames still buffered, this is 882 * used to check whether the cleanup timer still needs to run, 883 * if there are no frames we don't need to rearm the timer. 884 */ 885 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) && 886 skb_queue_empty(&sta->tx_filtered[ac])); 887 } 888 889 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local, 890 struct sta_info *sta) 891 { 892 bool have_buffered = false; 893 int ac; 894 895 /* This is only necessary for stations on BSS/MBSS interfaces */ 896 if (!sta->sdata->bss && 897 !ieee80211_vif_is_mesh(&sta->sdata->vif)) 898 return false; 899 900 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 901 have_buffered |= 902 sta_info_cleanup_expire_buffered_ac(local, sta, ac); 903 904 return have_buffered; 905 } 906 907 static int __must_check __sta_info_destroy_part1(struct sta_info *sta) 908 { 909 struct ieee80211_local *local; 910 struct ieee80211_sub_if_data *sdata; 911 int ret; 912 913 might_sleep(); 914 915 if (!sta) 916 return -ENOENT; 917 918 local = sta->local; 919 sdata = sta->sdata; 920 921 lockdep_assert_held(&local->sta_mtx); 922 923 /* 924 * Before removing the station from the driver and 925 * rate control, it might still start new aggregation 926 * sessions -- block that to make sure the tear-down 927 * will be sufficient. 928 */ 929 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 930 ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA); 931 932 /* 933 * Before removing the station from the driver there might be pending 934 * rx frames on RSS queues sent prior to the disassociation - wait for 935 * all such frames to be processed. 936 */ 937 drv_sync_rx_queues(local, sta); 938 939 ret = sta_info_hash_del(local, sta); 940 if (WARN_ON(ret)) 941 return ret; 942 943 /* 944 * for TDLS peers, make sure to return to the base channel before 945 * removal. 946 */ 947 if (test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { 948 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); 949 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); 950 } 951 952 list_del_rcu(&sta->list); 953 sta->removed = true; 954 955 drv_sta_pre_rcu_remove(local, sta->sdata, sta); 956 957 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 958 rcu_access_pointer(sdata->u.vlan.sta) == sta) 959 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL); 960 961 return 0; 962 } 963 964 static void __sta_info_destroy_part2(struct sta_info *sta) 965 { 966 struct ieee80211_local *local = sta->local; 967 struct ieee80211_sub_if_data *sdata = sta->sdata; 968 struct station_info *sinfo; 969 int ret; 970 971 /* 972 * NOTE: This assumes at least synchronize_net() was done 973 * after _part1 and before _part2! 974 */ 975 976 might_sleep(); 977 lockdep_assert_held(&local->sta_mtx); 978 979 /* now keys can no longer be reached */ 980 ieee80211_free_sta_keys(local, sta); 981 982 /* disable TIM bit - last chance to tell driver */ 983 __sta_info_recalc_tim(sta, true); 984 985 sta->dead = true; 986 987 local->num_sta--; 988 local->sta_generation++; 989 990 while (sta->sta_state > IEEE80211_STA_NONE) { 991 ret = sta_info_move_state(sta, sta->sta_state - 1); 992 if (ret) { 993 WARN_ON_ONCE(1); 994 break; 995 } 996 } 997 998 if (sta->uploaded) { 999 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE, 1000 IEEE80211_STA_NOTEXIST); 1001 WARN_ON_ONCE(ret != 0); 1002 } 1003 1004 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr); 1005 1006 sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL); 1007 if (sinfo) 1008 sta_set_sinfo(sta, sinfo); 1009 cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL); 1010 kfree(sinfo); 1011 1012 rate_control_remove_sta_debugfs(sta); 1013 ieee80211_sta_debugfs_remove(sta); 1014 1015 cleanup_single_sta(sta); 1016 } 1017 1018 int __must_check __sta_info_destroy(struct sta_info *sta) 1019 { 1020 int err = __sta_info_destroy_part1(sta); 1021 1022 if (err) 1023 return err; 1024 1025 synchronize_net(); 1026 1027 __sta_info_destroy_part2(sta); 1028 1029 return 0; 1030 } 1031 1032 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr) 1033 { 1034 struct sta_info *sta; 1035 int ret; 1036 1037 mutex_lock(&sdata->local->sta_mtx); 1038 sta = sta_info_get(sdata, addr); 1039 ret = __sta_info_destroy(sta); 1040 mutex_unlock(&sdata->local->sta_mtx); 1041 1042 return ret; 1043 } 1044 1045 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata, 1046 const u8 *addr) 1047 { 1048 struct sta_info *sta; 1049 int ret; 1050 1051 mutex_lock(&sdata->local->sta_mtx); 1052 sta = sta_info_get_bss(sdata, addr); 1053 ret = __sta_info_destroy(sta); 1054 mutex_unlock(&sdata->local->sta_mtx); 1055 1056 return ret; 1057 } 1058 1059 static void sta_info_cleanup(struct timer_list *t) 1060 { 1061 struct ieee80211_local *local = from_timer(local, t, sta_cleanup); 1062 struct sta_info *sta; 1063 bool timer_needed = false; 1064 1065 rcu_read_lock(); 1066 list_for_each_entry_rcu(sta, &local->sta_list, list) 1067 if (sta_info_cleanup_expire_buffered(local, sta)) 1068 timer_needed = true; 1069 rcu_read_unlock(); 1070 1071 if (local->quiescing) 1072 return; 1073 1074 if (!timer_needed) 1075 return; 1076 1077 mod_timer(&local->sta_cleanup, 1078 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL)); 1079 } 1080 1081 int sta_info_init(struct ieee80211_local *local) 1082 { 1083 int err; 1084 1085 err = rhltable_init(&local->sta_hash, &sta_rht_params); 1086 if (err) 1087 return err; 1088 1089 spin_lock_init(&local->tim_lock); 1090 mutex_init(&local->sta_mtx); 1091 INIT_LIST_HEAD(&local->sta_list); 1092 1093 timer_setup(&local->sta_cleanup, sta_info_cleanup, 0); 1094 return 0; 1095 } 1096 1097 void sta_info_stop(struct ieee80211_local *local) 1098 { 1099 del_timer_sync(&local->sta_cleanup); 1100 rhltable_destroy(&local->sta_hash); 1101 } 1102 1103 1104 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans) 1105 { 1106 struct ieee80211_local *local = sdata->local; 1107 struct sta_info *sta, *tmp; 1108 LIST_HEAD(free_list); 1109 int ret = 0; 1110 1111 might_sleep(); 1112 1113 WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP); 1114 WARN_ON(vlans && !sdata->bss); 1115 1116 mutex_lock(&local->sta_mtx); 1117 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1118 if (sdata == sta->sdata || 1119 (vlans && sdata->bss == sta->sdata->bss)) { 1120 if (!WARN_ON(__sta_info_destroy_part1(sta))) 1121 list_add(&sta->free_list, &free_list); 1122 ret++; 1123 } 1124 } 1125 1126 if (!list_empty(&free_list)) { 1127 synchronize_net(); 1128 list_for_each_entry_safe(sta, tmp, &free_list, free_list) 1129 __sta_info_destroy_part2(sta); 1130 } 1131 mutex_unlock(&local->sta_mtx); 1132 1133 return ret; 1134 } 1135 1136 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, 1137 unsigned long exp_time) 1138 { 1139 struct ieee80211_local *local = sdata->local; 1140 struct sta_info *sta, *tmp; 1141 1142 mutex_lock(&local->sta_mtx); 1143 1144 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1145 unsigned long last_active = ieee80211_sta_last_active(sta); 1146 1147 if (sdata != sta->sdata) 1148 continue; 1149 1150 if (time_is_before_jiffies(last_active + exp_time)) { 1151 sta_dbg(sta->sdata, "expiring inactive STA %pM\n", 1152 sta->sta.addr); 1153 1154 if (ieee80211_vif_is_mesh(&sdata->vif) && 1155 test_sta_flag(sta, WLAN_STA_PS_STA)) 1156 atomic_dec(&sdata->u.mesh.ps.num_sta_ps); 1157 1158 WARN_ON(__sta_info_destroy(sta)); 1159 } 1160 } 1161 1162 mutex_unlock(&local->sta_mtx); 1163 } 1164 1165 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw, 1166 const u8 *addr, 1167 const u8 *localaddr) 1168 { 1169 struct ieee80211_local *local = hw_to_local(hw); 1170 struct rhlist_head *tmp; 1171 struct sta_info *sta; 1172 1173 /* 1174 * Just return a random station if localaddr is NULL 1175 * ... first in list. 1176 */ 1177 for_each_sta_info(local, addr, sta, tmp) { 1178 if (localaddr && 1179 !ether_addr_equal(sta->sdata->vif.addr, localaddr)) 1180 continue; 1181 if (!sta->uploaded) 1182 return NULL; 1183 return &sta->sta; 1184 } 1185 1186 return NULL; 1187 } 1188 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr); 1189 1190 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif, 1191 const u8 *addr) 1192 { 1193 struct sta_info *sta; 1194 1195 if (!vif) 1196 return NULL; 1197 1198 sta = sta_info_get_bss(vif_to_sdata(vif), addr); 1199 if (!sta) 1200 return NULL; 1201 1202 if (!sta->uploaded) 1203 return NULL; 1204 1205 return &sta->sta; 1206 } 1207 EXPORT_SYMBOL(ieee80211_find_sta); 1208 1209 /* powersave support code */ 1210 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta) 1211 { 1212 struct ieee80211_sub_if_data *sdata = sta->sdata; 1213 struct ieee80211_local *local = sdata->local; 1214 struct sk_buff_head pending; 1215 int filtered = 0, buffered = 0, ac, i; 1216 unsigned long flags; 1217 struct ps_data *ps; 1218 1219 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1220 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 1221 u.ap); 1222 1223 if (sdata->vif.type == NL80211_IFTYPE_AP) 1224 ps = &sdata->bss->ps; 1225 else if (ieee80211_vif_is_mesh(&sdata->vif)) 1226 ps = &sdata->u.mesh.ps; 1227 else 1228 return; 1229 1230 clear_sta_flag(sta, WLAN_STA_SP); 1231 1232 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1); 1233 sta->driver_buffered_tids = 0; 1234 sta->txq_buffered_tids = 0; 1235 1236 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) 1237 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta); 1238 1239 if (sta->sta.txq[0]) { 1240 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) { 1241 if (!txq_has_queue(sta->sta.txq[i])) 1242 continue; 1243 1244 drv_wake_tx_queue(local, to_txq_info(sta->sta.txq[i])); 1245 } 1246 } 1247 1248 skb_queue_head_init(&pending); 1249 1250 /* sync with ieee80211_tx_h_unicast_ps_buf */ 1251 spin_lock(&sta->ps_lock); 1252 /* Send all buffered frames to the station */ 1253 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1254 int count = skb_queue_len(&pending), tmp; 1255 1256 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags); 1257 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending); 1258 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags); 1259 tmp = skb_queue_len(&pending); 1260 filtered += tmp - count; 1261 count = tmp; 1262 1263 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags); 1264 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending); 1265 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags); 1266 tmp = skb_queue_len(&pending); 1267 buffered += tmp - count; 1268 } 1269 1270 ieee80211_add_pending_skbs(local, &pending); 1271 1272 /* now we're no longer in the deliver code */ 1273 clear_sta_flag(sta, WLAN_STA_PS_DELIVER); 1274 1275 /* The station might have polled and then woken up before we responded, 1276 * so clear these flags now to avoid them sticking around. 1277 */ 1278 clear_sta_flag(sta, WLAN_STA_PSPOLL); 1279 clear_sta_flag(sta, WLAN_STA_UAPSD); 1280 spin_unlock(&sta->ps_lock); 1281 1282 atomic_dec(&ps->num_sta_ps); 1283 1284 /* This station just woke up and isn't aware of our SMPS state */ 1285 if (!ieee80211_vif_is_mesh(&sdata->vif) && 1286 !ieee80211_smps_is_restrictive(sta->known_smps_mode, 1287 sdata->smps_mode) && 1288 sta->known_smps_mode != sdata->bss->req_smps && 1289 sta_info_tx_streams(sta) != 1) { 1290 ht_dbg(sdata, 1291 "%pM just woke up and MIMO capable - update SMPS\n", 1292 sta->sta.addr); 1293 ieee80211_send_smps_action(sdata, sdata->bss->req_smps, 1294 sta->sta.addr, 1295 sdata->vif.bss_conf.bssid); 1296 } 1297 1298 local->total_ps_buffered -= buffered; 1299 1300 sta_info_recalc_tim(sta); 1301 1302 ps_dbg(sdata, 1303 "STA %pM aid %d sending %d filtered/%d PS frames since STA woke up\n", 1304 sta->sta.addr, sta->sta.aid, filtered, buffered); 1305 1306 ieee80211_check_fast_xmit(sta); 1307 } 1308 1309 static void ieee80211_send_null_response(struct sta_info *sta, int tid, 1310 enum ieee80211_frame_release_type reason, 1311 bool call_driver, bool more_data) 1312 { 1313 struct ieee80211_sub_if_data *sdata = sta->sdata; 1314 struct ieee80211_local *local = sdata->local; 1315 struct ieee80211_qos_hdr *nullfunc; 1316 struct sk_buff *skb; 1317 int size = sizeof(*nullfunc); 1318 __le16 fc; 1319 bool qos = sta->sta.wme; 1320 struct ieee80211_tx_info *info; 1321 struct ieee80211_chanctx_conf *chanctx_conf; 1322 1323 if (qos) { 1324 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | 1325 IEEE80211_STYPE_QOS_NULLFUNC | 1326 IEEE80211_FCTL_FROMDS); 1327 } else { 1328 size -= 2; 1329 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | 1330 IEEE80211_STYPE_NULLFUNC | 1331 IEEE80211_FCTL_FROMDS); 1332 } 1333 1334 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size); 1335 if (!skb) 1336 return; 1337 1338 skb_reserve(skb, local->hw.extra_tx_headroom); 1339 1340 nullfunc = skb_put(skb, size); 1341 nullfunc->frame_control = fc; 1342 nullfunc->duration_id = 0; 1343 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN); 1344 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 1345 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN); 1346 nullfunc->seq_ctrl = 0; 1347 1348 skb->priority = tid; 1349 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]); 1350 if (qos) { 1351 nullfunc->qos_ctrl = cpu_to_le16(tid); 1352 1353 if (reason == IEEE80211_FRAME_RELEASE_UAPSD) { 1354 nullfunc->qos_ctrl |= 1355 cpu_to_le16(IEEE80211_QOS_CTL_EOSP); 1356 if (more_data) 1357 nullfunc->frame_control |= 1358 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 1359 } 1360 } 1361 1362 info = IEEE80211_SKB_CB(skb); 1363 1364 /* 1365 * Tell TX path to send this frame even though the 1366 * STA may still remain is PS mode after this frame 1367 * exchange. Also set EOSP to indicate this packet 1368 * ends the poll/service period. 1369 */ 1370 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER | 1371 IEEE80211_TX_STATUS_EOSP | 1372 IEEE80211_TX_CTL_REQ_TX_STATUS; 1373 1374 info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE; 1375 1376 if (call_driver) 1377 drv_allow_buffered_frames(local, sta, BIT(tid), 1, 1378 reason, false); 1379 1380 skb->dev = sdata->dev; 1381 1382 rcu_read_lock(); 1383 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1384 if (WARN_ON(!chanctx_conf)) { 1385 rcu_read_unlock(); 1386 kfree_skb(skb); 1387 return; 1388 } 1389 1390 info->band = chanctx_conf->def.chan->band; 1391 ieee80211_xmit(sdata, sta, skb); 1392 rcu_read_unlock(); 1393 } 1394 1395 static int find_highest_prio_tid(unsigned long tids) 1396 { 1397 /* lower 3 TIDs aren't ordered perfectly */ 1398 if (tids & 0xF8) 1399 return fls(tids) - 1; 1400 /* TID 0 is BE just like TID 3 */ 1401 if (tids & BIT(0)) 1402 return 0; 1403 return fls(tids) - 1; 1404 } 1405 1406 /* Indicates if the MORE_DATA bit should be set in the last 1407 * frame obtained by ieee80211_sta_ps_get_frames. 1408 * Note that driver_release_tids is relevant only if 1409 * reason = IEEE80211_FRAME_RELEASE_PSPOLL 1410 */ 1411 static bool 1412 ieee80211_sta_ps_more_data(struct sta_info *sta, u8 ignored_acs, 1413 enum ieee80211_frame_release_type reason, 1414 unsigned long driver_release_tids) 1415 { 1416 int ac; 1417 1418 /* If the driver has data on more than one TID then 1419 * certainly there's more data if we release just a 1420 * single frame now (from a single TID). This will 1421 * only happen for PS-Poll. 1422 */ 1423 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL && 1424 hweight16(driver_release_tids) > 1) 1425 return true; 1426 1427 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1428 if (ignored_acs & ieee80211_ac_to_qos_mask[ac]) 1429 continue; 1430 1431 if (!skb_queue_empty(&sta->tx_filtered[ac]) || 1432 !skb_queue_empty(&sta->ps_tx_buf[ac])) 1433 return true; 1434 } 1435 1436 return false; 1437 } 1438 1439 static void 1440 ieee80211_sta_ps_get_frames(struct sta_info *sta, int n_frames, u8 ignored_acs, 1441 enum ieee80211_frame_release_type reason, 1442 struct sk_buff_head *frames, 1443 unsigned long *driver_release_tids) 1444 { 1445 struct ieee80211_sub_if_data *sdata = sta->sdata; 1446 struct ieee80211_local *local = sdata->local; 1447 int ac; 1448 1449 /* Get response frame(s) and more data bit for the last one. */ 1450 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1451 unsigned long tids; 1452 1453 if (ignored_acs & ieee80211_ac_to_qos_mask[ac]) 1454 continue; 1455 1456 tids = ieee80211_tids_for_ac(ac); 1457 1458 /* if we already have frames from software, then we can't also 1459 * release from hardware queues 1460 */ 1461 if (skb_queue_empty(frames)) { 1462 *driver_release_tids |= 1463 sta->driver_buffered_tids & tids; 1464 *driver_release_tids |= sta->txq_buffered_tids & tids; 1465 } 1466 1467 if (!*driver_release_tids) { 1468 struct sk_buff *skb; 1469 1470 while (n_frames > 0) { 1471 skb = skb_dequeue(&sta->tx_filtered[ac]); 1472 if (!skb) { 1473 skb = skb_dequeue( 1474 &sta->ps_tx_buf[ac]); 1475 if (skb) 1476 local->total_ps_buffered--; 1477 } 1478 if (!skb) 1479 break; 1480 n_frames--; 1481 __skb_queue_tail(frames, skb); 1482 } 1483 } 1484 1485 /* If we have more frames buffered on this AC, then abort the 1486 * loop since we can't send more data from other ACs before 1487 * the buffered frames from this. 1488 */ 1489 if (!skb_queue_empty(&sta->tx_filtered[ac]) || 1490 !skb_queue_empty(&sta->ps_tx_buf[ac])) 1491 break; 1492 } 1493 } 1494 1495 static void 1496 ieee80211_sta_ps_deliver_response(struct sta_info *sta, 1497 int n_frames, u8 ignored_acs, 1498 enum ieee80211_frame_release_type reason) 1499 { 1500 struct ieee80211_sub_if_data *sdata = sta->sdata; 1501 struct ieee80211_local *local = sdata->local; 1502 unsigned long driver_release_tids = 0; 1503 struct sk_buff_head frames; 1504 bool more_data; 1505 1506 /* Service or PS-Poll period starts */ 1507 set_sta_flag(sta, WLAN_STA_SP); 1508 1509 __skb_queue_head_init(&frames); 1510 1511 ieee80211_sta_ps_get_frames(sta, n_frames, ignored_acs, reason, 1512 &frames, &driver_release_tids); 1513 1514 more_data = ieee80211_sta_ps_more_data(sta, ignored_acs, reason, driver_release_tids); 1515 1516 if (driver_release_tids && reason == IEEE80211_FRAME_RELEASE_PSPOLL) 1517 driver_release_tids = 1518 BIT(find_highest_prio_tid(driver_release_tids)); 1519 1520 if (skb_queue_empty(&frames) && !driver_release_tids) { 1521 int tid, ac; 1522 1523 /* 1524 * For PS-Poll, this can only happen due to a race condition 1525 * when we set the TIM bit and the station notices it, but 1526 * before it can poll for the frame we expire it. 1527 * 1528 * For uAPSD, this is said in the standard (11.2.1.5 h): 1529 * At each unscheduled SP for a non-AP STA, the AP shall 1530 * attempt to transmit at least one MSDU or MMPDU, but no 1531 * more than the value specified in the Max SP Length field 1532 * in the QoS Capability element from delivery-enabled ACs, 1533 * that are destined for the non-AP STA. 1534 * 1535 * Since we have no other MSDU/MMPDU, transmit a QoS null frame. 1536 */ 1537 1538 /* This will evaluate to 1, 3, 5 or 7. */ 1539 for (ac = IEEE80211_AC_VO; ac < IEEE80211_NUM_ACS; ac++) 1540 if (!(ignored_acs & ieee80211_ac_to_qos_mask[ac])) 1541 break; 1542 tid = 7 - 2 * ac; 1543 1544 ieee80211_send_null_response(sta, tid, reason, true, false); 1545 } else if (!driver_release_tids) { 1546 struct sk_buff_head pending; 1547 struct sk_buff *skb; 1548 int num = 0; 1549 u16 tids = 0; 1550 bool need_null = false; 1551 1552 skb_queue_head_init(&pending); 1553 1554 while ((skb = __skb_dequeue(&frames))) { 1555 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1556 struct ieee80211_hdr *hdr = (void *) skb->data; 1557 u8 *qoshdr = NULL; 1558 1559 num++; 1560 1561 /* 1562 * Tell TX path to send this frame even though the 1563 * STA may still remain is PS mode after this frame 1564 * exchange. 1565 */ 1566 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 1567 info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE; 1568 1569 /* 1570 * Use MoreData flag to indicate whether there are 1571 * more buffered frames for this STA 1572 */ 1573 if (more_data || !skb_queue_empty(&frames)) 1574 hdr->frame_control |= 1575 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 1576 else 1577 hdr->frame_control &= 1578 cpu_to_le16(~IEEE80211_FCTL_MOREDATA); 1579 1580 if (ieee80211_is_data_qos(hdr->frame_control) || 1581 ieee80211_is_qos_nullfunc(hdr->frame_control)) 1582 qoshdr = ieee80211_get_qos_ctl(hdr); 1583 1584 tids |= BIT(skb->priority); 1585 1586 __skb_queue_tail(&pending, skb); 1587 1588 /* end service period after last frame or add one */ 1589 if (!skb_queue_empty(&frames)) 1590 continue; 1591 1592 if (reason != IEEE80211_FRAME_RELEASE_UAPSD) { 1593 /* for PS-Poll, there's only one frame */ 1594 info->flags |= IEEE80211_TX_STATUS_EOSP | 1595 IEEE80211_TX_CTL_REQ_TX_STATUS; 1596 break; 1597 } 1598 1599 /* For uAPSD, things are a bit more complicated. If the 1600 * last frame has a QoS header (i.e. is a QoS-data or 1601 * QoS-nulldata frame) then just set the EOSP bit there 1602 * and be done. 1603 * If the frame doesn't have a QoS header (which means 1604 * it should be a bufferable MMPDU) then we can't set 1605 * the EOSP bit in the QoS header; add a QoS-nulldata 1606 * frame to the list to send it after the MMPDU. 1607 * 1608 * Note that this code is only in the mac80211-release 1609 * code path, we assume that the driver will not buffer 1610 * anything but QoS-data frames, or if it does, will 1611 * create the QoS-nulldata frame by itself if needed. 1612 * 1613 * Cf. 802.11-2012 10.2.1.10 (c). 1614 */ 1615 if (qoshdr) { 1616 *qoshdr |= IEEE80211_QOS_CTL_EOSP; 1617 1618 info->flags |= IEEE80211_TX_STATUS_EOSP | 1619 IEEE80211_TX_CTL_REQ_TX_STATUS; 1620 } else { 1621 /* The standard isn't completely clear on this 1622 * as it says the more-data bit should be set 1623 * if there are more BUs. The QoS-Null frame 1624 * we're about to send isn't buffered yet, we 1625 * only create it below, but let's pretend it 1626 * was buffered just in case some clients only 1627 * expect more-data=0 when eosp=1. 1628 */ 1629 hdr->frame_control |= 1630 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 1631 need_null = true; 1632 num++; 1633 } 1634 break; 1635 } 1636 1637 drv_allow_buffered_frames(local, sta, tids, num, 1638 reason, more_data); 1639 1640 ieee80211_add_pending_skbs(local, &pending); 1641 1642 if (need_null) 1643 ieee80211_send_null_response( 1644 sta, find_highest_prio_tid(tids), 1645 reason, false, false); 1646 1647 sta_info_recalc_tim(sta); 1648 } else { 1649 int tid; 1650 1651 /* 1652 * We need to release a frame that is buffered somewhere in the 1653 * driver ... it'll have to handle that. 1654 * Note that the driver also has to check the number of frames 1655 * on the TIDs we're releasing from - if there are more than 1656 * n_frames it has to set the more-data bit (if we didn't ask 1657 * it to set it anyway due to other buffered frames); if there 1658 * are fewer than n_frames it has to make sure to adjust that 1659 * to allow the service period to end properly. 1660 */ 1661 drv_release_buffered_frames(local, sta, driver_release_tids, 1662 n_frames, reason, more_data); 1663 1664 /* 1665 * Note that we don't recalculate the TIM bit here as it would 1666 * most likely have no effect at all unless the driver told us 1667 * that the TID(s) became empty before returning here from the 1668 * release function. 1669 * Either way, however, when the driver tells us that the TID(s) 1670 * became empty or we find that a txq became empty, we'll do the 1671 * TIM recalculation. 1672 */ 1673 1674 if (!sta->sta.txq[0]) 1675 return; 1676 1677 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) { 1678 if (!(driver_release_tids & BIT(tid)) || 1679 txq_has_queue(sta->sta.txq[tid])) 1680 continue; 1681 1682 sta_info_recalc_tim(sta); 1683 break; 1684 } 1685 } 1686 } 1687 1688 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta) 1689 { 1690 u8 ignore_for_response = sta->sta.uapsd_queues; 1691 1692 /* 1693 * If all ACs are delivery-enabled then we should reply 1694 * from any of them, if only some are enabled we reply 1695 * only from the non-enabled ones. 1696 */ 1697 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1) 1698 ignore_for_response = 0; 1699 1700 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response, 1701 IEEE80211_FRAME_RELEASE_PSPOLL); 1702 } 1703 1704 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta) 1705 { 1706 int n_frames = sta->sta.max_sp; 1707 u8 delivery_enabled = sta->sta.uapsd_queues; 1708 1709 /* 1710 * If we ever grow support for TSPEC this might happen if 1711 * the TSPEC update from hostapd comes in between a trigger 1712 * frame setting WLAN_STA_UAPSD in the RX path and this 1713 * actually getting called. 1714 */ 1715 if (!delivery_enabled) 1716 return; 1717 1718 switch (sta->sta.max_sp) { 1719 case 1: 1720 n_frames = 2; 1721 break; 1722 case 2: 1723 n_frames = 4; 1724 break; 1725 case 3: 1726 n_frames = 6; 1727 break; 1728 case 0: 1729 /* XXX: what is a good value? */ 1730 n_frames = 128; 1731 break; 1732 } 1733 1734 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled, 1735 IEEE80211_FRAME_RELEASE_UAPSD); 1736 } 1737 1738 void ieee80211_sta_block_awake(struct ieee80211_hw *hw, 1739 struct ieee80211_sta *pubsta, bool block) 1740 { 1741 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1742 1743 trace_api_sta_block_awake(sta->local, pubsta, block); 1744 1745 if (block) { 1746 set_sta_flag(sta, WLAN_STA_PS_DRIVER); 1747 ieee80211_clear_fast_xmit(sta); 1748 return; 1749 } 1750 1751 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1752 return; 1753 1754 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) { 1755 set_sta_flag(sta, WLAN_STA_PS_DELIVER); 1756 clear_sta_flag(sta, WLAN_STA_PS_DRIVER); 1757 ieee80211_queue_work(hw, &sta->drv_deliver_wk); 1758 } else if (test_sta_flag(sta, WLAN_STA_PSPOLL) || 1759 test_sta_flag(sta, WLAN_STA_UAPSD)) { 1760 /* must be asleep in this case */ 1761 clear_sta_flag(sta, WLAN_STA_PS_DRIVER); 1762 ieee80211_queue_work(hw, &sta->drv_deliver_wk); 1763 } else { 1764 clear_sta_flag(sta, WLAN_STA_PS_DRIVER); 1765 ieee80211_check_fast_xmit(sta); 1766 } 1767 } 1768 EXPORT_SYMBOL(ieee80211_sta_block_awake); 1769 1770 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta) 1771 { 1772 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1773 struct ieee80211_local *local = sta->local; 1774 1775 trace_api_eosp(local, pubsta); 1776 1777 clear_sta_flag(sta, WLAN_STA_SP); 1778 } 1779 EXPORT_SYMBOL(ieee80211_sta_eosp); 1780 1781 void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid) 1782 { 1783 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1784 enum ieee80211_frame_release_type reason; 1785 bool more_data; 1786 1787 trace_api_send_eosp_nullfunc(sta->local, pubsta, tid); 1788 1789 reason = IEEE80211_FRAME_RELEASE_UAPSD; 1790 more_data = ieee80211_sta_ps_more_data(sta, ~sta->sta.uapsd_queues, 1791 reason, 0); 1792 1793 ieee80211_send_null_response(sta, tid, reason, false, more_data); 1794 } 1795 EXPORT_SYMBOL(ieee80211_send_eosp_nullfunc); 1796 1797 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta, 1798 u8 tid, bool buffered) 1799 { 1800 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1801 1802 if (WARN_ON(tid >= IEEE80211_NUM_TIDS)) 1803 return; 1804 1805 trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered); 1806 1807 if (buffered) 1808 set_bit(tid, &sta->driver_buffered_tids); 1809 else 1810 clear_bit(tid, &sta->driver_buffered_tids); 1811 1812 sta_info_recalc_tim(sta); 1813 } 1814 EXPORT_SYMBOL(ieee80211_sta_set_buffered); 1815 1816 int sta_info_move_state(struct sta_info *sta, 1817 enum ieee80211_sta_state new_state) 1818 { 1819 might_sleep(); 1820 1821 if (sta->sta_state == new_state) 1822 return 0; 1823 1824 /* check allowed transitions first */ 1825 1826 switch (new_state) { 1827 case IEEE80211_STA_NONE: 1828 if (sta->sta_state != IEEE80211_STA_AUTH) 1829 return -EINVAL; 1830 break; 1831 case IEEE80211_STA_AUTH: 1832 if (sta->sta_state != IEEE80211_STA_NONE && 1833 sta->sta_state != IEEE80211_STA_ASSOC) 1834 return -EINVAL; 1835 break; 1836 case IEEE80211_STA_ASSOC: 1837 if (sta->sta_state != IEEE80211_STA_AUTH && 1838 sta->sta_state != IEEE80211_STA_AUTHORIZED) 1839 return -EINVAL; 1840 break; 1841 case IEEE80211_STA_AUTHORIZED: 1842 if (sta->sta_state != IEEE80211_STA_ASSOC) 1843 return -EINVAL; 1844 break; 1845 default: 1846 WARN(1, "invalid state %d", new_state); 1847 return -EINVAL; 1848 } 1849 1850 sta_dbg(sta->sdata, "moving STA %pM to state %d\n", 1851 sta->sta.addr, new_state); 1852 1853 /* 1854 * notify the driver before the actual changes so it can 1855 * fail the transition 1856 */ 1857 if (test_sta_flag(sta, WLAN_STA_INSERTED)) { 1858 int err = drv_sta_state(sta->local, sta->sdata, sta, 1859 sta->sta_state, new_state); 1860 if (err) 1861 return err; 1862 } 1863 1864 /* reflect the change in all state variables */ 1865 1866 switch (new_state) { 1867 case IEEE80211_STA_NONE: 1868 if (sta->sta_state == IEEE80211_STA_AUTH) 1869 clear_bit(WLAN_STA_AUTH, &sta->_flags); 1870 break; 1871 case IEEE80211_STA_AUTH: 1872 if (sta->sta_state == IEEE80211_STA_NONE) { 1873 set_bit(WLAN_STA_AUTH, &sta->_flags); 1874 } else if (sta->sta_state == IEEE80211_STA_ASSOC) { 1875 clear_bit(WLAN_STA_ASSOC, &sta->_flags); 1876 ieee80211_recalc_min_chandef(sta->sdata); 1877 if (!sta->sta.support_p2p_ps) 1878 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata); 1879 } 1880 break; 1881 case IEEE80211_STA_ASSOC: 1882 if (sta->sta_state == IEEE80211_STA_AUTH) { 1883 set_bit(WLAN_STA_ASSOC, &sta->_flags); 1884 ieee80211_recalc_min_chandef(sta->sdata); 1885 if (!sta->sta.support_p2p_ps) 1886 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata); 1887 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) { 1888 ieee80211_vif_dec_num_mcast(sta->sdata); 1889 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags); 1890 ieee80211_clear_fast_xmit(sta); 1891 ieee80211_clear_fast_rx(sta); 1892 } 1893 break; 1894 case IEEE80211_STA_AUTHORIZED: 1895 if (sta->sta_state == IEEE80211_STA_ASSOC) { 1896 ieee80211_vif_inc_num_mcast(sta->sdata); 1897 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags); 1898 ieee80211_check_fast_xmit(sta); 1899 ieee80211_check_fast_rx(sta); 1900 } 1901 break; 1902 default: 1903 break; 1904 } 1905 1906 sta->sta_state = new_state; 1907 1908 return 0; 1909 } 1910 1911 u8 sta_info_tx_streams(struct sta_info *sta) 1912 { 1913 struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap; 1914 u8 rx_streams; 1915 1916 if (!sta->sta.ht_cap.ht_supported) 1917 return 1; 1918 1919 if (sta->sta.vht_cap.vht_supported) { 1920 int i; 1921 u16 tx_mcs_map = 1922 le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map); 1923 1924 for (i = 7; i >= 0; i--) 1925 if ((tx_mcs_map & (0x3 << (i * 2))) != 1926 IEEE80211_VHT_MCS_NOT_SUPPORTED) 1927 return i + 1; 1928 } 1929 1930 if (ht_cap->mcs.rx_mask[3]) 1931 rx_streams = 4; 1932 else if (ht_cap->mcs.rx_mask[2]) 1933 rx_streams = 3; 1934 else if (ht_cap->mcs.rx_mask[1]) 1935 rx_streams = 2; 1936 else 1937 rx_streams = 1; 1938 1939 if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF)) 1940 return rx_streams; 1941 1942 return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) 1943 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; 1944 } 1945 1946 static struct ieee80211_sta_rx_stats * 1947 sta_get_last_rx_stats(struct sta_info *sta) 1948 { 1949 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats; 1950 struct ieee80211_local *local = sta->local; 1951 int cpu; 1952 1953 if (!ieee80211_hw_check(&local->hw, USES_RSS)) 1954 return stats; 1955 1956 for_each_possible_cpu(cpu) { 1957 struct ieee80211_sta_rx_stats *cpustats; 1958 1959 cpustats = per_cpu_ptr(sta->pcpu_rx_stats, cpu); 1960 1961 if (time_after(cpustats->last_rx, stats->last_rx)) 1962 stats = cpustats; 1963 } 1964 1965 return stats; 1966 } 1967 1968 static void sta_stats_decode_rate(struct ieee80211_local *local, u16 rate, 1969 struct rate_info *rinfo) 1970 { 1971 rinfo->bw = STA_STATS_GET(BW, rate); 1972 1973 switch (STA_STATS_GET(TYPE, rate)) { 1974 case STA_STATS_RATE_TYPE_VHT: 1975 rinfo->flags = RATE_INFO_FLAGS_VHT_MCS; 1976 rinfo->mcs = STA_STATS_GET(VHT_MCS, rate); 1977 rinfo->nss = STA_STATS_GET(VHT_NSS, rate); 1978 if (STA_STATS_GET(SGI, rate)) 1979 rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI; 1980 break; 1981 case STA_STATS_RATE_TYPE_HT: 1982 rinfo->flags = RATE_INFO_FLAGS_MCS; 1983 rinfo->mcs = STA_STATS_GET(HT_MCS, rate); 1984 if (STA_STATS_GET(SGI, rate)) 1985 rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI; 1986 break; 1987 case STA_STATS_RATE_TYPE_LEGACY: { 1988 struct ieee80211_supported_band *sband; 1989 u16 brate; 1990 unsigned int shift; 1991 int band = STA_STATS_GET(LEGACY_BAND, rate); 1992 int rate_idx = STA_STATS_GET(LEGACY_IDX, rate); 1993 1994 rinfo->flags = 0; 1995 sband = local->hw.wiphy->bands[band]; 1996 brate = sband->bitrates[rate_idx].bitrate; 1997 if (rinfo->bw == RATE_INFO_BW_5) 1998 shift = 2; 1999 else if (rinfo->bw == RATE_INFO_BW_10) 2000 shift = 1; 2001 else 2002 shift = 0; 2003 rinfo->legacy = DIV_ROUND_UP(brate, 1 << shift); 2004 break; 2005 } 2006 } 2007 } 2008 2009 static int sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo) 2010 { 2011 u16 rate = READ_ONCE(sta_get_last_rx_stats(sta)->last_rate); 2012 2013 if (rate == STA_STATS_RATE_INVALID) 2014 return -EINVAL; 2015 2016 sta_stats_decode_rate(sta->local, rate, rinfo); 2017 return 0; 2018 } 2019 2020 static void sta_set_tidstats(struct sta_info *sta, 2021 struct cfg80211_tid_stats *tidstats, 2022 int tid) 2023 { 2024 struct ieee80211_local *local = sta->local; 2025 2026 if (!(tidstats->filled & BIT(NL80211_TID_STATS_RX_MSDU))) { 2027 unsigned int start; 2028 2029 do { 2030 start = u64_stats_fetch_begin(&sta->rx_stats.syncp); 2031 tidstats->rx_msdu = sta->rx_stats.msdu[tid]; 2032 } while (u64_stats_fetch_retry(&sta->rx_stats.syncp, start)); 2033 2034 tidstats->filled |= BIT(NL80211_TID_STATS_RX_MSDU); 2035 } 2036 2037 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU))) { 2038 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU); 2039 tidstats->tx_msdu = sta->tx_stats.msdu[tid]; 2040 } 2041 2042 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_RETRIES)) && 2043 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 2044 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_RETRIES); 2045 tidstats->tx_msdu_retries = sta->status_stats.msdu_retries[tid]; 2046 } 2047 2048 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_FAILED)) && 2049 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 2050 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_FAILED); 2051 tidstats->tx_msdu_failed = sta->status_stats.msdu_failed[tid]; 2052 } 2053 } 2054 2055 static inline u64 sta_get_stats_bytes(struct ieee80211_sta_rx_stats *rxstats) 2056 { 2057 unsigned int start; 2058 u64 value; 2059 2060 do { 2061 start = u64_stats_fetch_begin(&rxstats->syncp); 2062 value = rxstats->bytes; 2063 } while (u64_stats_fetch_retry(&rxstats->syncp, start)); 2064 2065 return value; 2066 } 2067 2068 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo) 2069 { 2070 struct ieee80211_sub_if_data *sdata = sta->sdata; 2071 struct ieee80211_local *local = sdata->local; 2072 u32 thr = 0; 2073 int i, ac, cpu; 2074 struct ieee80211_sta_rx_stats *last_rxstats; 2075 2076 last_rxstats = sta_get_last_rx_stats(sta); 2077 2078 sinfo->generation = sdata->local->sta_generation; 2079 2080 /* do before driver, so beacon filtering drivers have a 2081 * chance to e.g. just add the number of filtered beacons 2082 * (or just modify the value entirely, of course) 2083 */ 2084 if (sdata->vif.type == NL80211_IFTYPE_STATION) 2085 sinfo->rx_beacon = sdata->u.mgd.count_beacon_signal; 2086 2087 drv_sta_statistics(local, sdata, &sta->sta, sinfo); 2088 2089 sinfo->filled |= BIT(NL80211_STA_INFO_INACTIVE_TIME) | 2090 BIT(NL80211_STA_INFO_STA_FLAGS) | 2091 BIT(NL80211_STA_INFO_BSS_PARAM) | 2092 BIT(NL80211_STA_INFO_CONNECTED_TIME) | 2093 BIT(NL80211_STA_INFO_RX_DROP_MISC); 2094 2095 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 2096 sinfo->beacon_loss_count = sdata->u.mgd.beacon_loss_count; 2097 sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_LOSS); 2098 } 2099 2100 sinfo->connected_time = ktime_get_seconds() - sta->last_connected; 2101 sinfo->inactive_time = 2102 jiffies_to_msecs(jiffies - ieee80211_sta_last_active(sta)); 2103 2104 if (!(sinfo->filled & (BIT(NL80211_STA_INFO_TX_BYTES64) | 2105 BIT(NL80211_STA_INFO_TX_BYTES)))) { 2106 sinfo->tx_bytes = 0; 2107 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 2108 sinfo->tx_bytes += sta->tx_stats.bytes[ac]; 2109 sinfo->filled |= BIT(NL80211_STA_INFO_TX_BYTES64); 2110 } 2111 2112 if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_PACKETS))) { 2113 sinfo->tx_packets = 0; 2114 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 2115 sinfo->tx_packets += sta->tx_stats.packets[ac]; 2116 sinfo->filled |= BIT(NL80211_STA_INFO_TX_PACKETS); 2117 } 2118 2119 if (!(sinfo->filled & (BIT(NL80211_STA_INFO_RX_BYTES64) | 2120 BIT(NL80211_STA_INFO_RX_BYTES)))) { 2121 sinfo->rx_bytes += sta_get_stats_bytes(&sta->rx_stats); 2122 2123 if (sta->pcpu_rx_stats) { 2124 for_each_possible_cpu(cpu) { 2125 struct ieee80211_sta_rx_stats *cpurxs; 2126 2127 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu); 2128 sinfo->rx_bytes += sta_get_stats_bytes(cpurxs); 2129 } 2130 } 2131 2132 sinfo->filled |= BIT(NL80211_STA_INFO_RX_BYTES64); 2133 } 2134 2135 if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_PACKETS))) { 2136 sinfo->rx_packets = sta->rx_stats.packets; 2137 if (sta->pcpu_rx_stats) { 2138 for_each_possible_cpu(cpu) { 2139 struct ieee80211_sta_rx_stats *cpurxs; 2140 2141 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu); 2142 sinfo->rx_packets += cpurxs->packets; 2143 } 2144 } 2145 sinfo->filled |= BIT(NL80211_STA_INFO_RX_PACKETS); 2146 } 2147 2148 if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_RETRIES))) { 2149 sinfo->tx_retries = sta->status_stats.retry_count; 2150 sinfo->filled |= BIT(NL80211_STA_INFO_TX_RETRIES); 2151 } 2152 2153 if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_FAILED))) { 2154 sinfo->tx_failed = sta->status_stats.retry_failed; 2155 sinfo->filled |= BIT(NL80211_STA_INFO_TX_FAILED); 2156 } 2157 2158 sinfo->rx_dropped_misc = sta->rx_stats.dropped; 2159 if (sta->pcpu_rx_stats) { 2160 for_each_possible_cpu(cpu) { 2161 struct ieee80211_sta_rx_stats *cpurxs; 2162 2163 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu); 2164 sinfo->rx_dropped_misc += cpurxs->dropped; 2165 } 2166 } 2167 2168 if (sdata->vif.type == NL80211_IFTYPE_STATION && 2169 !(sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)) { 2170 sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_RX) | 2171 BIT(NL80211_STA_INFO_BEACON_SIGNAL_AVG); 2172 sinfo->rx_beacon_signal_avg = ieee80211_ave_rssi(&sdata->vif); 2173 } 2174 2175 if (ieee80211_hw_check(&sta->local->hw, SIGNAL_DBM) || 2176 ieee80211_hw_check(&sta->local->hw, SIGNAL_UNSPEC)) { 2177 if (!(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL))) { 2178 sinfo->signal = (s8)last_rxstats->last_signal; 2179 sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL); 2180 } 2181 2182 if (!sta->pcpu_rx_stats && 2183 !(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL_AVG))) { 2184 sinfo->signal_avg = 2185 -ewma_signal_read(&sta->rx_stats_avg.signal); 2186 sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL_AVG); 2187 } 2188 } 2189 2190 /* for the average - if pcpu_rx_stats isn't set - rxstats must point to 2191 * the sta->rx_stats struct, so the check here is fine with and without 2192 * pcpu statistics 2193 */ 2194 if (last_rxstats->chains && 2195 !(sinfo->filled & (BIT(NL80211_STA_INFO_CHAIN_SIGNAL) | 2196 BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG)))) { 2197 sinfo->filled |= BIT(NL80211_STA_INFO_CHAIN_SIGNAL); 2198 if (!sta->pcpu_rx_stats) 2199 sinfo->filled |= BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG); 2200 2201 sinfo->chains = last_rxstats->chains; 2202 2203 for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) { 2204 sinfo->chain_signal[i] = 2205 last_rxstats->chain_signal_last[i]; 2206 sinfo->chain_signal_avg[i] = 2207 -ewma_signal_read(&sta->rx_stats_avg.chain_signal[i]); 2208 } 2209 } 2210 2211 if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_BITRATE))) { 2212 sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, 2213 &sinfo->txrate); 2214 sinfo->filled |= BIT(NL80211_STA_INFO_TX_BITRATE); 2215 } 2216 2217 if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_BITRATE))) { 2218 if (sta_set_rate_info_rx(sta, &sinfo->rxrate) == 0) 2219 sinfo->filled |= BIT(NL80211_STA_INFO_RX_BITRATE); 2220 } 2221 2222 sinfo->filled |= BIT(NL80211_STA_INFO_TID_STATS); 2223 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) { 2224 struct cfg80211_tid_stats *tidstats = &sinfo->pertid[i]; 2225 2226 sta_set_tidstats(sta, tidstats, i); 2227 } 2228 2229 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2230 #ifdef CONFIG_MAC80211_MESH 2231 sinfo->filled |= BIT(NL80211_STA_INFO_LLID) | 2232 BIT(NL80211_STA_INFO_PLID) | 2233 BIT(NL80211_STA_INFO_PLINK_STATE) | 2234 BIT(NL80211_STA_INFO_LOCAL_PM) | 2235 BIT(NL80211_STA_INFO_PEER_PM) | 2236 BIT(NL80211_STA_INFO_NONPEER_PM); 2237 2238 sinfo->llid = sta->mesh->llid; 2239 sinfo->plid = sta->mesh->plid; 2240 sinfo->plink_state = sta->mesh->plink_state; 2241 if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) { 2242 sinfo->filled |= BIT(NL80211_STA_INFO_T_OFFSET); 2243 sinfo->t_offset = sta->mesh->t_offset; 2244 } 2245 sinfo->local_pm = sta->mesh->local_pm; 2246 sinfo->peer_pm = sta->mesh->peer_pm; 2247 sinfo->nonpeer_pm = sta->mesh->nonpeer_pm; 2248 #endif 2249 } 2250 2251 sinfo->bss_param.flags = 0; 2252 if (sdata->vif.bss_conf.use_cts_prot) 2253 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_CTS_PROT; 2254 if (sdata->vif.bss_conf.use_short_preamble) 2255 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE; 2256 if (sdata->vif.bss_conf.use_short_slot) 2257 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME; 2258 sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period; 2259 sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int; 2260 2261 sinfo->sta_flags.set = 0; 2262 sinfo->sta_flags.mask = BIT(NL80211_STA_FLAG_AUTHORIZED) | 2263 BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) | 2264 BIT(NL80211_STA_FLAG_WME) | 2265 BIT(NL80211_STA_FLAG_MFP) | 2266 BIT(NL80211_STA_FLAG_AUTHENTICATED) | 2267 BIT(NL80211_STA_FLAG_ASSOCIATED) | 2268 BIT(NL80211_STA_FLAG_TDLS_PEER); 2269 if (test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2270 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHORIZED); 2271 if (test_sta_flag(sta, WLAN_STA_SHORT_PREAMBLE)) 2272 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE); 2273 if (sta->sta.wme) 2274 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_WME); 2275 if (test_sta_flag(sta, WLAN_STA_MFP)) 2276 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_MFP); 2277 if (test_sta_flag(sta, WLAN_STA_AUTH)) 2278 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHENTICATED); 2279 if (test_sta_flag(sta, WLAN_STA_ASSOC)) 2280 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_ASSOCIATED); 2281 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) 2282 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER); 2283 2284 thr = sta_get_expected_throughput(sta); 2285 2286 if (thr != 0) { 2287 sinfo->filled |= BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT); 2288 sinfo->expected_throughput = thr; 2289 } 2290 } 2291 2292 u32 sta_get_expected_throughput(struct sta_info *sta) 2293 { 2294 struct ieee80211_sub_if_data *sdata = sta->sdata; 2295 struct ieee80211_local *local = sdata->local; 2296 struct rate_control_ref *ref = NULL; 2297 u32 thr = 0; 2298 2299 if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) 2300 ref = local->rate_ctrl; 2301 2302 /* check if the driver has a SW RC implementation */ 2303 if (ref && ref->ops->get_expected_throughput) 2304 thr = ref->ops->get_expected_throughput(sta->rate_ctrl_priv); 2305 else 2306 thr = drv_get_expected_throughput(local, sta); 2307 2308 return thr; 2309 } 2310 2311 unsigned long ieee80211_sta_last_active(struct sta_info *sta) 2312 { 2313 struct ieee80211_sta_rx_stats *stats = sta_get_last_rx_stats(sta); 2314 2315 if (time_after(stats->last_rx, sta->status_stats.last_ack)) 2316 return stats->last_rx; 2317 return sta->status_stats.last_ack; 2318 } 2319 2320 static void sta_update_codel_params(struct sta_info *sta, u32 thr) 2321 { 2322 if (!sta->sdata->local->ops->wake_tx_queue) 2323 return; 2324 2325 if (thr && thr < STA_SLOW_THRESHOLD * sta->local->num_sta) { 2326 sta->cparams.target = MS2TIME(50); 2327 sta->cparams.interval = MS2TIME(300); 2328 sta->cparams.ecn = false; 2329 } else { 2330 sta->cparams.target = MS2TIME(20); 2331 sta->cparams.interval = MS2TIME(100); 2332 sta->cparams.ecn = true; 2333 } 2334 } 2335 2336 void ieee80211_sta_set_expected_throughput(struct ieee80211_sta *pubsta, 2337 u32 thr) 2338 { 2339 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 2340 2341 sta_update_codel_params(sta, thr); 2342 } 2343