sta_info.c revision ce662b44ce22e3e8886104d5feb2a451d7ba560f
1/* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 10#include <linux/module.h> 11#include <linux/init.h> 12#include <linux/netdevice.h> 13#include <linux/types.h> 14#include <linux/slab.h> 15#include <linux/skbuff.h> 16#include <linux/if_arp.h> 17#include <linux/timer.h> 18#include <linux/rtnetlink.h> 19 20#include <net/mac80211.h> 21#include "ieee80211_i.h" 22#include "driver-ops.h" 23#include "rate.h" 24#include "sta_info.h" 25#include "debugfs_sta.h" 26#include "mesh.h" 27#include "wme.h" 28 29/** 30 * DOC: STA information lifetime rules 31 * 32 * STA info structures (&struct sta_info) are managed in a hash table 33 * for faster lookup and a list for iteration. They are managed using 34 * RCU, i.e. access to the list and hash table is protected by RCU. 35 * 36 * Upon allocating a STA info structure with sta_info_alloc(), the caller 37 * owns that structure. It must then insert it into the hash table using 38 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter 39 * case (which acquires an rcu read section but must not be called from 40 * within one) will the pointer still be valid after the call. Note that 41 * the caller may not do much with the STA info before inserting it, in 42 * particular, it may not start any mesh peer link management or add 43 * encryption keys. 44 * 45 * When the insertion fails (sta_info_insert()) returns non-zero), the 46 * structure will have been freed by sta_info_insert()! 47 * 48 * Station entries are added by mac80211 when you establish a link with a 49 * peer. This means different things for the different type of interfaces 50 * we support. For a regular station this mean we add the AP sta when we 51 * receive an association response from the AP. For IBSS this occurs when 52 * get to know about a peer on the same IBSS. For WDS we add the sta for 53 * the peer immediately upon device open. When using AP mode we add stations 54 * for each respective station upon request from userspace through nl80211. 55 * 56 * In order to remove a STA info structure, various sta_info_destroy_*() 57 * calls are available. 58 * 59 * There is no concept of ownership on a STA entry, each structure is 60 * owned by the global hash table/list until it is removed. All users of 61 * the structure need to be RCU protected so that the structure won't be 62 * freed before they are done using it. 63 */ 64 65/* Caller must hold local->sta_lock */ 66static int sta_info_hash_del(struct ieee80211_local *local, 67 struct sta_info *sta) 68{ 69 struct sta_info *s; 70 71 s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)], 72 lockdep_is_held(&local->sta_lock)); 73 if (!s) 74 return -ENOENT; 75 if (s == sta) { 76 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], 77 s->hnext); 78 return 0; 79 } 80 81 while (rcu_access_pointer(s->hnext) && 82 rcu_access_pointer(s->hnext) != sta) 83 s = rcu_dereference_protected(s->hnext, 84 lockdep_is_held(&local->sta_lock)); 85 if (rcu_access_pointer(s->hnext)) { 86 rcu_assign_pointer(s->hnext, sta->hnext); 87 return 0; 88 } 89 90 return -ENOENT; 91} 92 93/* protected by RCU */ 94struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata, 95 const u8 *addr) 96{ 97 struct ieee80211_local *local = sdata->local; 98 struct sta_info *sta; 99 100 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], 101 lockdep_is_held(&local->sta_lock) || 102 lockdep_is_held(&local->sta_mtx)); 103 while (sta) { 104 if (sta->sdata == sdata && !sta->dummy && 105 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) 106 break; 107 sta = rcu_dereference_check(sta->hnext, 108 lockdep_is_held(&local->sta_lock) || 109 lockdep_is_held(&local->sta_mtx)); 110 } 111 return sta; 112} 113 114/* get a station info entry even if it is a dummy station*/ 115struct sta_info *sta_info_get_rx(struct ieee80211_sub_if_data *sdata, 116 const u8 *addr) 117{ 118 struct ieee80211_local *local = sdata->local; 119 struct sta_info *sta; 120 121 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], 122 lockdep_is_held(&local->sta_lock) || 123 lockdep_is_held(&local->sta_mtx)); 124 while (sta) { 125 if (sta->sdata == sdata && 126 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) 127 break; 128 sta = rcu_dereference_check(sta->hnext, 129 lockdep_is_held(&local->sta_lock) || 130 lockdep_is_held(&local->sta_mtx)); 131 } 132 return sta; 133} 134 135/* 136 * Get sta info either from the specified interface 137 * or from one of its vlans 138 */ 139struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata, 140 const u8 *addr) 141{ 142 struct ieee80211_local *local = sdata->local; 143 struct sta_info *sta; 144 145 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], 146 lockdep_is_held(&local->sta_lock) || 147 lockdep_is_held(&local->sta_mtx)); 148 while (sta) { 149 if ((sta->sdata == sdata || 150 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) && 151 !sta->dummy && 152 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) 153 break; 154 sta = rcu_dereference_check(sta->hnext, 155 lockdep_is_held(&local->sta_lock) || 156 lockdep_is_held(&local->sta_mtx)); 157 } 158 return sta; 159} 160 161/* 162 * Get sta info either from the specified interface 163 * or from one of its vlans (including dummy stations) 164 */ 165struct sta_info *sta_info_get_bss_rx(struct ieee80211_sub_if_data *sdata, 166 const u8 *addr) 167{ 168 struct ieee80211_local *local = sdata->local; 169 struct sta_info *sta; 170 171 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], 172 lockdep_is_held(&local->sta_lock) || 173 lockdep_is_held(&local->sta_mtx)); 174 while (sta) { 175 if ((sta->sdata == sdata || 176 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) && 177 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) 178 break; 179 sta = rcu_dereference_check(sta->hnext, 180 lockdep_is_held(&local->sta_lock) || 181 lockdep_is_held(&local->sta_mtx)); 182 } 183 return sta; 184} 185 186struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, 187 int idx) 188{ 189 struct ieee80211_local *local = sdata->local; 190 struct sta_info *sta; 191 int i = 0; 192 193 list_for_each_entry_rcu(sta, &local->sta_list, list) { 194 if (sdata != sta->sdata) 195 continue; 196 if (i < idx) { 197 ++i; 198 continue; 199 } 200 return sta; 201 } 202 203 return NULL; 204} 205 206/** 207 * __sta_info_free - internal STA free helper 208 * 209 * @local: pointer to the global information 210 * @sta: STA info to free 211 * 212 * This function must undo everything done by sta_info_alloc() 213 * that may happen before sta_info_insert(). 214 */ 215static void __sta_info_free(struct ieee80211_local *local, 216 struct sta_info *sta) 217{ 218 if (sta->rate_ctrl) { 219 rate_control_free_sta(sta); 220 rate_control_put(sta->rate_ctrl); 221 } 222 223#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 224 wiphy_debug(local->hw.wiphy, "Destroyed STA %pM\n", sta->sta.addr); 225#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 226 227 kfree(sta); 228} 229 230/* Caller must hold local->sta_lock */ 231static void sta_info_hash_add(struct ieee80211_local *local, 232 struct sta_info *sta) 233{ 234 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)]; 235 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta); 236} 237 238static void sta_unblock(struct work_struct *wk) 239{ 240 struct sta_info *sta; 241 242 sta = container_of(wk, struct sta_info, drv_unblock_wk); 243 244 if (sta->dead) 245 return; 246 247 if (!test_sta_flags(sta, WLAN_STA_PS_STA)) 248 ieee80211_sta_ps_deliver_wakeup(sta); 249 else if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL)) { 250 clear_sta_flags(sta, WLAN_STA_PS_DRIVER); 251 252 local_bh_disable(); 253 ieee80211_sta_ps_deliver_poll_response(sta); 254 local_bh_enable(); 255 } else if (test_and_clear_sta_flags(sta, WLAN_STA_UAPSD)) { 256 clear_sta_flags(sta, WLAN_STA_PS_DRIVER); 257 258 local_bh_disable(); 259 ieee80211_sta_ps_deliver_uapsd(sta); 260 local_bh_enable(); 261 } else 262 clear_sta_flags(sta, WLAN_STA_PS_DRIVER); 263} 264 265static int sta_prepare_rate_control(struct ieee80211_local *local, 266 struct sta_info *sta, gfp_t gfp) 267{ 268 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) 269 return 0; 270 271 sta->rate_ctrl = rate_control_get(local->rate_ctrl); 272 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, 273 &sta->sta, gfp); 274 if (!sta->rate_ctrl_priv) { 275 rate_control_put(sta->rate_ctrl); 276 return -ENOMEM; 277 } 278 279 return 0; 280} 281 282struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, 283 u8 *addr, gfp_t gfp) 284{ 285 struct ieee80211_local *local = sdata->local; 286 struct sta_info *sta; 287 struct timespec uptime; 288 int i; 289 290 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp); 291 if (!sta) 292 return NULL; 293 294 spin_lock_init(&sta->lock); 295 spin_lock_init(&sta->flaglock); 296 INIT_WORK(&sta->drv_unblock_wk, sta_unblock); 297 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work); 298 mutex_init(&sta->ampdu_mlme.mtx); 299 300 memcpy(sta->sta.addr, addr, ETH_ALEN); 301 sta->local = local; 302 sta->sdata = sdata; 303 sta->last_rx = jiffies; 304 305 do_posix_clock_monotonic_gettime(&uptime); 306 sta->last_connected = uptime.tv_sec; 307 ewma_init(&sta->avg_signal, 1024, 8); 308 309 if (sta_prepare_rate_control(local, sta, gfp)) { 310 kfree(sta); 311 return NULL; 312 } 313 314 for (i = 0; i < STA_TID_NUM; i++) { 315 /* 316 * timer_to_tid must be initialized with identity mapping 317 * to enable session_timer's data differentiation. See 318 * sta_rx_agg_session_timer_expired for usage. 319 */ 320 sta->timer_to_tid[i] = i; 321 } 322 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 323 skb_queue_head_init(&sta->ps_tx_buf[i]); 324 skb_queue_head_init(&sta->tx_filtered[i]); 325 } 326 327 for (i = 0; i < NUM_RX_DATA_QUEUES; i++) 328 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX); 329 330#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 331 wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr); 332#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 333 334#ifdef CONFIG_MAC80211_MESH 335 sta->plink_state = NL80211_PLINK_LISTEN; 336 init_timer(&sta->plink_timer); 337#endif 338 339 return sta; 340} 341 342static int sta_info_finish_insert(struct sta_info *sta, 343 bool async, bool dummy_reinsert) 344{ 345 struct ieee80211_local *local = sta->local; 346 struct ieee80211_sub_if_data *sdata = sta->sdata; 347 struct station_info sinfo; 348 unsigned long flags; 349 int err = 0; 350 351 lockdep_assert_held(&local->sta_mtx); 352 353 if (!sta->dummy || dummy_reinsert) { 354 /* notify driver */ 355 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 356 sdata = container_of(sdata->bss, 357 struct ieee80211_sub_if_data, 358 u.ap); 359 err = drv_sta_add(local, sdata, &sta->sta); 360 if (err) { 361 if (!async) 362 return err; 363 printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to " 364 "driver (%d) - keeping it anyway.\n", 365 sdata->name, sta->sta.addr, err); 366 } else { 367 sta->uploaded = true; 368#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 369 if (async) 370 wiphy_debug(local->hw.wiphy, 371 "Finished adding IBSS STA %pM\n", 372 sta->sta.addr); 373#endif 374 } 375 376 sdata = sta->sdata; 377 } 378 379 if (!dummy_reinsert) { 380 if (!async) { 381 local->num_sta++; 382 local->sta_generation++; 383 smp_mb(); 384 385 /* make the station visible */ 386 spin_lock_irqsave(&local->sta_lock, flags); 387 sta_info_hash_add(local, sta); 388 spin_unlock_irqrestore(&local->sta_lock, flags); 389 } 390 391 list_add(&sta->list, &local->sta_list); 392 } else { 393 sta->dummy = false; 394 } 395 396 if (!sta->dummy) { 397 ieee80211_sta_debugfs_add(sta); 398 rate_control_add_sta_debugfs(sta); 399 400 memset(&sinfo, 0, sizeof(sinfo)); 401 sinfo.filled = 0; 402 sinfo.generation = local->sta_generation; 403 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL); 404 } 405 406 return 0; 407} 408 409static void sta_info_finish_pending(struct ieee80211_local *local) 410{ 411 struct sta_info *sta; 412 unsigned long flags; 413 414 spin_lock_irqsave(&local->sta_lock, flags); 415 while (!list_empty(&local->sta_pending_list)) { 416 sta = list_first_entry(&local->sta_pending_list, 417 struct sta_info, list); 418 list_del(&sta->list); 419 spin_unlock_irqrestore(&local->sta_lock, flags); 420 421 sta_info_finish_insert(sta, true, false); 422 423 spin_lock_irqsave(&local->sta_lock, flags); 424 } 425 spin_unlock_irqrestore(&local->sta_lock, flags); 426} 427 428static void sta_info_finish_work(struct work_struct *work) 429{ 430 struct ieee80211_local *local = 431 container_of(work, struct ieee80211_local, sta_finish_work); 432 433 mutex_lock(&local->sta_mtx); 434 sta_info_finish_pending(local); 435 mutex_unlock(&local->sta_mtx); 436} 437 438static int sta_info_insert_check(struct sta_info *sta) 439{ 440 struct ieee80211_sub_if_data *sdata = sta->sdata; 441 442 /* 443 * Can't be a WARN_ON because it can be triggered through a race: 444 * something inserts a STA (on one CPU) without holding the RTNL 445 * and another CPU turns off the net device. 446 */ 447 if (unlikely(!ieee80211_sdata_running(sdata))) 448 return -ENETDOWN; 449 450 if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 || 451 is_multicast_ether_addr(sta->sta.addr))) 452 return -EINVAL; 453 454 return 0; 455} 456 457static int sta_info_insert_ibss(struct sta_info *sta) __acquires(RCU) 458{ 459 struct ieee80211_local *local = sta->local; 460 struct ieee80211_sub_if_data *sdata = sta->sdata; 461 unsigned long flags; 462 463 spin_lock_irqsave(&local->sta_lock, flags); 464 /* check if STA exists already */ 465 if (sta_info_get_bss_rx(sdata, sta->sta.addr)) { 466 spin_unlock_irqrestore(&local->sta_lock, flags); 467 rcu_read_lock(); 468 return -EEXIST; 469 } 470 471 local->num_sta++; 472 local->sta_generation++; 473 smp_mb(); 474 sta_info_hash_add(local, sta); 475 476 list_add_tail(&sta->list, &local->sta_pending_list); 477 478 rcu_read_lock(); 479 spin_unlock_irqrestore(&local->sta_lock, flags); 480 481#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 482 wiphy_debug(local->hw.wiphy, "Added IBSS STA %pM\n", 483 sta->sta.addr); 484#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 485 486 ieee80211_queue_work(&local->hw, &local->sta_finish_work); 487 488 return 0; 489} 490 491/* 492 * should be called with sta_mtx locked 493 * this function replaces the mutex lock 494 * with a RCU lock 495 */ 496static int sta_info_insert_non_ibss(struct sta_info *sta) __acquires(RCU) 497{ 498 struct ieee80211_local *local = sta->local; 499 struct ieee80211_sub_if_data *sdata = sta->sdata; 500 unsigned long flags; 501 struct sta_info *exist_sta; 502 bool dummy_reinsert = false; 503 int err = 0; 504 505 lockdep_assert_held(&local->sta_mtx); 506 507 /* 508 * On first glance, this will look racy, because the code 509 * in this function, which inserts a station with sleeping, 510 * unlocks the sta_lock between checking existence in the 511 * hash table and inserting into it. 512 * 513 * However, it is not racy against itself because it keeps 514 * the mutex locked. 515 */ 516 517 spin_lock_irqsave(&local->sta_lock, flags); 518 /* 519 * check if STA exists already. 520 * only accept a scenario of a second call to sta_info_insert_non_ibss 521 * with a dummy station entry that was inserted earlier 522 * in that case - assume that the dummy station flag should 523 * be removed. 524 */ 525 exist_sta = sta_info_get_bss_rx(sdata, sta->sta.addr); 526 if (exist_sta) { 527 if (exist_sta == sta && sta->dummy) { 528 dummy_reinsert = true; 529 } else { 530 spin_unlock_irqrestore(&local->sta_lock, flags); 531 mutex_unlock(&local->sta_mtx); 532 rcu_read_lock(); 533 return -EEXIST; 534 } 535 } 536 537 spin_unlock_irqrestore(&local->sta_lock, flags); 538 539 err = sta_info_finish_insert(sta, false, dummy_reinsert); 540 if (err) { 541 mutex_unlock(&local->sta_mtx); 542 rcu_read_lock(); 543 return err; 544 } 545 546#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 547 wiphy_debug(local->hw.wiphy, "Inserted %sSTA %pM\n", 548 sta->dummy ? "dummy " : "", sta->sta.addr); 549#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 550 551 /* move reference to rcu-protected */ 552 rcu_read_lock(); 553 mutex_unlock(&local->sta_mtx); 554 555 if (ieee80211_vif_is_mesh(&sdata->vif)) 556 mesh_accept_plinks_update(sdata); 557 558 return 0; 559} 560 561int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU) 562{ 563 struct ieee80211_local *local = sta->local; 564 struct ieee80211_sub_if_data *sdata = sta->sdata; 565 int err = 0; 566 567 err = sta_info_insert_check(sta); 568 if (err) { 569 rcu_read_lock(); 570 goto out_free; 571 } 572 573 /* 574 * In ad-hoc mode, we sometimes need to insert stations 575 * from tasklet context from the RX path. To avoid races, 576 * always do so in that case -- see the comment below. 577 */ 578 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 579 err = sta_info_insert_ibss(sta); 580 if (err) 581 goto out_free; 582 583 return 0; 584 } 585 586 /* 587 * It might seem that the function called below is in race against 588 * the function call above that atomically inserts the station... That, 589 * however, is not true because the above code can only 590 * be invoked for IBSS interfaces, and the below code will 591 * not be -- and the two do not race against each other as 592 * the hash table also keys off the interface. 593 */ 594 595 might_sleep(); 596 597 mutex_lock(&local->sta_mtx); 598 599 err = sta_info_insert_non_ibss(sta); 600 if (err) 601 goto out_free; 602 603 return 0; 604 out_free: 605 BUG_ON(!err); 606 __sta_info_free(local, sta); 607 return err; 608} 609 610int sta_info_insert(struct sta_info *sta) 611{ 612 int err = sta_info_insert_rcu(sta); 613 614 rcu_read_unlock(); 615 616 return err; 617} 618 619/* Caller must hold sta->local->sta_mtx */ 620int sta_info_reinsert(struct sta_info *sta) 621{ 622 struct ieee80211_local *local = sta->local; 623 int err = 0; 624 625 err = sta_info_insert_check(sta); 626 if (err) { 627 mutex_unlock(&local->sta_mtx); 628 return err; 629 } 630 631 might_sleep(); 632 633 err = sta_info_insert_non_ibss(sta); 634 rcu_read_unlock(); 635 return err; 636} 637 638static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid) 639{ 640 /* 641 * This format has been mandated by the IEEE specifications, 642 * so this line may not be changed to use the __set_bit() format. 643 */ 644 bss->tim[aid / 8] |= (1 << (aid % 8)); 645} 646 647static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid) 648{ 649 /* 650 * This format has been mandated by the IEEE specifications, 651 * so this line may not be changed to use the __clear_bit() format. 652 */ 653 bss->tim[aid / 8] &= ~(1 << (aid % 8)); 654} 655 656static unsigned long ieee80211_tids_for_ac(int ac) 657{ 658 /* If we ever support TIDs > 7, this obviously needs to be adjusted */ 659 switch (ac) { 660 case IEEE80211_AC_VO: 661 return BIT(6) | BIT(7); 662 case IEEE80211_AC_VI: 663 return BIT(4) | BIT(5); 664 case IEEE80211_AC_BE: 665 return BIT(0) | BIT(3); 666 case IEEE80211_AC_BK: 667 return BIT(1) | BIT(2); 668 default: 669 WARN_ON(1); 670 return 0; 671 } 672} 673 674void sta_info_recalc_tim(struct sta_info *sta) 675{ 676 struct ieee80211_local *local = sta->local; 677 struct ieee80211_if_ap *bss = sta->sdata->bss; 678 unsigned long flags; 679 bool indicate_tim = false; 680 u8 ignore_for_tim = sta->sta.uapsd_queues; 681 int ac; 682 683 if (WARN_ON_ONCE(!sta->sdata->bss)) 684 return; 685 686 /* No need to do anything if the driver does all */ 687 if (local->hw.flags & IEEE80211_HW_AP_LINK_PS) 688 return; 689 690 if (sta->dead) 691 goto done; 692 693 /* 694 * If all ACs are delivery-enabled then we should build 695 * the TIM bit for all ACs anyway; if only some are then 696 * we ignore those and build the TIM bit using only the 697 * non-enabled ones. 698 */ 699 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1) 700 ignore_for_tim = 0; 701 702 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 703 unsigned long tids; 704 705 if (ignore_for_tim & BIT(ac)) 706 continue; 707 708 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) || 709 !skb_queue_empty(&sta->ps_tx_buf[ac]); 710 if (indicate_tim) 711 break; 712 713 tids = ieee80211_tids_for_ac(ac); 714 715 indicate_tim |= 716 sta->driver_buffered_tids & tids; 717 } 718 719 done: 720 spin_lock_irqsave(&local->sta_lock, flags); 721 722 if (indicate_tim) 723 __bss_tim_set(bss, sta->sta.aid); 724 else 725 __bss_tim_clear(bss, sta->sta.aid); 726 727 if (local->ops->set_tim) { 728 local->tim_in_locked_section = true; 729 drv_set_tim(local, &sta->sta, indicate_tim); 730 local->tim_in_locked_section = false; 731 } 732 733 spin_unlock_irqrestore(&local->sta_lock, flags); 734} 735 736static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb) 737{ 738 struct ieee80211_tx_info *info; 739 int timeout; 740 741 if (!skb) 742 return false; 743 744 info = IEEE80211_SKB_CB(skb); 745 746 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ 747 timeout = (sta->listen_interval * 748 sta->sdata->vif.bss_conf.beacon_int * 749 32 / 15625) * HZ; 750 if (timeout < STA_TX_BUFFER_EXPIRE) 751 timeout = STA_TX_BUFFER_EXPIRE; 752 return time_after(jiffies, info->control.jiffies + timeout); 753} 754 755 756static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local, 757 struct sta_info *sta, int ac) 758{ 759 unsigned long flags; 760 struct sk_buff *skb; 761 762 /* 763 * First check for frames that should expire on the filtered 764 * queue. Frames here were rejected by the driver and are on 765 * a separate queue to avoid reordering with normal PS-buffered 766 * frames. They also aren't accounted for right now in the 767 * total_ps_buffered counter. 768 */ 769 for (;;) { 770 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags); 771 skb = skb_peek(&sta->tx_filtered[ac]); 772 if (sta_info_buffer_expired(sta, skb)) 773 skb = __skb_dequeue(&sta->tx_filtered[ac]); 774 else 775 skb = NULL; 776 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags); 777 778 /* 779 * Frames are queued in order, so if this one 780 * hasn't expired yet we can stop testing. If 781 * we actually reached the end of the queue we 782 * also need to stop, of course. 783 */ 784 if (!skb) 785 break; 786 dev_kfree_skb(skb); 787 } 788 789 /* 790 * Now also check the normal PS-buffered queue, this will 791 * only find something if the filtered queue was emptied 792 * since the filtered frames are all before the normal PS 793 * buffered frames. 794 */ 795 for (;;) { 796 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags); 797 skb = skb_peek(&sta->ps_tx_buf[ac]); 798 if (sta_info_buffer_expired(sta, skb)) 799 skb = __skb_dequeue(&sta->ps_tx_buf[ac]); 800 else 801 skb = NULL; 802 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags); 803 804 /* 805 * frames are queued in order, so if this one 806 * hasn't expired yet (or we reached the end of 807 * the queue) we can stop testing 808 */ 809 if (!skb) 810 break; 811 812 local->total_ps_buffered--; 813#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 814 printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n", 815 sta->sta.addr); 816#endif 817 dev_kfree_skb(skb); 818 } 819 820 /* 821 * Finally, recalculate the TIM bit for this station -- it might 822 * now be clear because the station was too slow to retrieve its 823 * frames. 824 */ 825 sta_info_recalc_tim(sta); 826 827 /* 828 * Return whether there are any frames still buffered, this is 829 * used to check whether the cleanup timer still needs to run, 830 * if there are no frames we don't need to rearm the timer. 831 */ 832 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) && 833 skb_queue_empty(&sta->tx_filtered[ac])); 834} 835 836static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local, 837 struct sta_info *sta) 838{ 839 bool have_buffered = false; 840 int ac; 841 842 /* This is only necessary for stations on BSS interfaces */ 843 if (!sta->sdata->bss) 844 return false; 845 846 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 847 have_buffered |= 848 sta_info_cleanup_expire_buffered_ac(local, sta, ac); 849 850 return have_buffered; 851} 852 853static int __must_check __sta_info_destroy(struct sta_info *sta) 854{ 855 struct ieee80211_local *local; 856 struct ieee80211_sub_if_data *sdata; 857 unsigned long flags; 858 int ret, i, ac; 859 860 might_sleep(); 861 862 if (!sta) 863 return -ENOENT; 864 865 local = sta->local; 866 sdata = sta->sdata; 867 868 /* 869 * Before removing the station from the driver and 870 * rate control, it might still start new aggregation 871 * sessions -- block that to make sure the tear-down 872 * will be sufficient. 873 */ 874 set_sta_flags(sta, WLAN_STA_BLOCK_BA); 875 ieee80211_sta_tear_down_BA_sessions(sta, true); 876 877 spin_lock_irqsave(&local->sta_lock, flags); 878 ret = sta_info_hash_del(local, sta); 879 /* this might still be the pending list ... which is fine */ 880 if (!ret) 881 list_del(&sta->list); 882 spin_unlock_irqrestore(&local->sta_lock, flags); 883 if (ret) 884 return ret; 885 886 mutex_lock(&local->key_mtx); 887 for (i = 0; i < NUM_DEFAULT_KEYS; i++) 888 __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i])); 889 if (sta->ptk) 890 __ieee80211_key_free(key_mtx_dereference(local, sta->ptk)); 891 mutex_unlock(&local->key_mtx); 892 893 sta->dead = true; 894 895 if (test_and_clear_sta_flags(sta, 896 WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) { 897 BUG_ON(!sdata->bss); 898 899 atomic_dec(&sdata->bss->num_sta_ps); 900 sta_info_recalc_tim(sta); 901 } 902 903 local->num_sta--; 904 local->sta_generation++; 905 906 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 907 rcu_assign_pointer(sdata->u.vlan.sta, NULL); 908 909 if (sta->uploaded) { 910 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 911 sdata = container_of(sdata->bss, 912 struct ieee80211_sub_if_data, 913 u.ap); 914 drv_sta_remove(local, sdata, &sta->sta); 915 sdata = sta->sdata; 916 } 917 918 /* 919 * At this point, after we wait for an RCU grace period, 920 * neither mac80211 nor the driver can reference this 921 * sta struct any more except by still existing timers 922 * associated with this station that we clean up below. 923 */ 924 synchronize_rcu(); 925 926 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 927 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]); 928 __skb_queue_purge(&sta->ps_tx_buf[ac]); 929 __skb_queue_purge(&sta->tx_filtered[ac]); 930 } 931 932#ifdef CONFIG_MAC80211_MESH 933 if (ieee80211_vif_is_mesh(&sdata->vif)) 934 mesh_accept_plinks_update(sdata); 935#endif 936 937#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 938 wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr); 939#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 940 cancel_work_sync(&sta->drv_unblock_wk); 941 942 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL); 943 944 rate_control_remove_sta_debugfs(sta); 945 ieee80211_sta_debugfs_remove(sta); 946 947#ifdef CONFIG_MAC80211_MESH 948 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) { 949 mesh_plink_deactivate(sta); 950 del_timer_sync(&sta->plink_timer); 951 } 952#endif 953 954 __sta_info_free(local, sta); 955 956 return 0; 957} 958 959int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr) 960{ 961 struct sta_info *sta; 962 int ret; 963 964 mutex_lock(&sdata->local->sta_mtx); 965 sta = sta_info_get_rx(sdata, addr); 966 ret = __sta_info_destroy(sta); 967 mutex_unlock(&sdata->local->sta_mtx); 968 969 return ret; 970} 971 972int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata, 973 const u8 *addr) 974{ 975 struct sta_info *sta; 976 int ret; 977 978 mutex_lock(&sdata->local->sta_mtx); 979 sta = sta_info_get_bss_rx(sdata, addr); 980 ret = __sta_info_destroy(sta); 981 mutex_unlock(&sdata->local->sta_mtx); 982 983 return ret; 984} 985 986static void sta_info_cleanup(unsigned long data) 987{ 988 struct ieee80211_local *local = (struct ieee80211_local *) data; 989 struct sta_info *sta; 990 bool timer_needed = false; 991 992 rcu_read_lock(); 993 list_for_each_entry_rcu(sta, &local->sta_list, list) 994 if (sta_info_cleanup_expire_buffered(local, sta)) 995 timer_needed = true; 996 rcu_read_unlock(); 997 998 if (local->quiescing) 999 return; 1000 1001 if (!timer_needed) 1002 return; 1003 1004 mod_timer(&local->sta_cleanup, 1005 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL)); 1006} 1007 1008void sta_info_init(struct ieee80211_local *local) 1009{ 1010 spin_lock_init(&local->sta_lock); 1011 mutex_init(&local->sta_mtx); 1012 INIT_LIST_HEAD(&local->sta_list); 1013 INIT_LIST_HEAD(&local->sta_pending_list); 1014 INIT_WORK(&local->sta_finish_work, sta_info_finish_work); 1015 1016 setup_timer(&local->sta_cleanup, sta_info_cleanup, 1017 (unsigned long)local); 1018} 1019 1020void sta_info_stop(struct ieee80211_local *local) 1021{ 1022 del_timer(&local->sta_cleanup); 1023 sta_info_flush(local, NULL); 1024} 1025 1026/** 1027 * sta_info_flush - flush matching STA entries from the STA table 1028 * 1029 * Returns the number of removed STA entries. 1030 * 1031 * @local: local interface data 1032 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs 1033 */ 1034int sta_info_flush(struct ieee80211_local *local, 1035 struct ieee80211_sub_if_data *sdata) 1036{ 1037 struct sta_info *sta, *tmp; 1038 int ret = 0; 1039 1040 might_sleep(); 1041 1042 mutex_lock(&local->sta_mtx); 1043 1044 sta_info_finish_pending(local); 1045 1046 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1047 if (!sdata || sdata == sta->sdata) 1048 WARN_ON(__sta_info_destroy(sta)); 1049 } 1050 mutex_unlock(&local->sta_mtx); 1051 1052 return ret; 1053} 1054 1055void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, 1056 unsigned long exp_time) 1057{ 1058 struct ieee80211_local *local = sdata->local; 1059 struct sta_info *sta, *tmp; 1060 1061 mutex_lock(&local->sta_mtx); 1062 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) 1063 if (time_after(jiffies, sta->last_rx + exp_time)) { 1064#ifdef CONFIG_MAC80211_IBSS_DEBUG 1065 printk(KERN_DEBUG "%s: expiring inactive STA %pM\n", 1066 sdata->name, sta->sta.addr); 1067#endif 1068 WARN_ON(__sta_info_destroy(sta)); 1069 } 1070 mutex_unlock(&local->sta_mtx); 1071} 1072 1073struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw, 1074 const u8 *addr, 1075 const u8 *localaddr) 1076{ 1077 struct sta_info *sta, *nxt; 1078 1079 /* 1080 * Just return a random station if localaddr is NULL 1081 * ... first in list. 1082 */ 1083 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) { 1084 if (localaddr && 1085 compare_ether_addr(sta->sdata->vif.addr, localaddr) != 0) 1086 continue; 1087 if (!sta->uploaded) 1088 return NULL; 1089 return &sta->sta; 1090 } 1091 1092 return NULL; 1093} 1094EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr); 1095 1096struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif, 1097 const u8 *addr) 1098{ 1099 struct sta_info *sta; 1100 1101 if (!vif) 1102 return NULL; 1103 1104 sta = sta_info_get_bss(vif_to_sdata(vif), addr); 1105 if (!sta) 1106 return NULL; 1107 1108 if (!sta->uploaded) 1109 return NULL; 1110 1111 return &sta->sta; 1112} 1113EXPORT_SYMBOL(ieee80211_find_sta); 1114 1115static void clear_sta_ps_flags(void *_sta) 1116{ 1117 struct sta_info *sta = _sta; 1118 1119 clear_sta_flags(sta, WLAN_STA_PS_DRIVER | WLAN_STA_PS_STA); 1120} 1121 1122/* powersave support code */ 1123void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta) 1124{ 1125 struct ieee80211_sub_if_data *sdata = sta->sdata; 1126 struct ieee80211_local *local = sdata->local; 1127 struct sk_buff_head pending; 1128 int filtered = 0, buffered = 0, ac; 1129 1130 clear_sta_flags(sta, WLAN_STA_SP); 1131 1132 BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM) > 1); 1133 sta->driver_buffered_tids = 0; 1134 1135 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) 1136 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta); 1137 1138 skb_queue_head_init(&pending); 1139 1140 /* Send all buffered frames to the station */ 1141 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1142 int count = skb_queue_len(&pending), tmp; 1143 1144 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending); 1145 tmp = skb_queue_len(&pending); 1146 filtered += tmp - count; 1147 count = tmp; 1148 1149 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending); 1150 tmp = skb_queue_len(&pending); 1151 buffered += tmp - count; 1152 } 1153 1154 ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta); 1155 1156 local->total_ps_buffered -= buffered; 1157 1158 sta_info_recalc_tim(sta); 1159 1160#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 1161 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames " 1162 "since STA not sleeping anymore\n", sdata->name, 1163 sta->sta.addr, sta->sta.aid, filtered, buffered); 1164#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 1165} 1166 1167static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata, 1168 struct sta_info *sta, int tid, 1169 bool uapsd) 1170{ 1171 struct ieee80211_local *local = sdata->local; 1172 struct ieee80211_qos_hdr *nullfunc; 1173 struct sk_buff *skb; 1174 int size = sizeof(*nullfunc); 1175 __le16 fc; 1176 bool qos = test_sta_flags(sta, WLAN_STA_WME); 1177 struct ieee80211_tx_info *info; 1178 1179 if (qos) { 1180 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | 1181 IEEE80211_STYPE_QOS_NULLFUNC | 1182 IEEE80211_FCTL_FROMDS); 1183 } else { 1184 size -= 2; 1185 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | 1186 IEEE80211_STYPE_NULLFUNC | 1187 IEEE80211_FCTL_FROMDS); 1188 } 1189 1190 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size); 1191 if (!skb) 1192 return; 1193 1194 skb_reserve(skb, local->hw.extra_tx_headroom); 1195 1196 nullfunc = (void *) skb_put(skb, size); 1197 nullfunc->frame_control = fc; 1198 nullfunc->duration_id = 0; 1199 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN); 1200 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 1201 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN); 1202 1203 if (qos) { 1204 skb->priority = tid; 1205 1206 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]); 1207 1208 nullfunc->qos_ctrl = cpu_to_le16(tid); 1209 1210 if (uapsd) 1211 nullfunc->qos_ctrl |= 1212 cpu_to_le16(IEEE80211_QOS_CTL_EOSP); 1213 } 1214 1215 info = IEEE80211_SKB_CB(skb); 1216 1217 /* 1218 * Tell TX path to send this frame even though the 1219 * STA may still remain is PS mode after this frame 1220 * exchange. 1221 */ 1222 info->flags |= IEEE80211_TX_CTL_POLL_RESPONSE; 1223 1224 if (uapsd) 1225 info->flags |= IEEE80211_TX_STATUS_EOSP | 1226 IEEE80211_TX_CTL_REQ_TX_STATUS; 1227 1228 ieee80211_xmit(sdata, skb); 1229} 1230 1231static void 1232ieee80211_sta_ps_deliver_response(struct sta_info *sta, 1233 int n_frames, u8 ignored_acs, 1234 enum ieee80211_frame_release_type reason) 1235{ 1236 struct ieee80211_sub_if_data *sdata = sta->sdata; 1237 struct ieee80211_local *local = sdata->local; 1238 bool found = false; 1239 bool more_data = false; 1240 int ac; 1241 unsigned long driver_release_tids = 0; 1242 struct sk_buff_head frames; 1243 1244 __skb_queue_head_init(&frames); 1245 1246 /* 1247 * Get response frame(s) and more data bit for it. 1248 */ 1249 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1250 unsigned long tids; 1251 1252 if (ignored_acs & BIT(ac)) 1253 continue; 1254 1255 tids = ieee80211_tids_for_ac(ac); 1256 1257 if (!found) { 1258 driver_release_tids = sta->driver_buffered_tids & tids; 1259 if (driver_release_tids) { 1260 found = true; 1261 } else { 1262 struct sk_buff *skb; 1263 1264 while (n_frames > 0) { 1265 skb = skb_dequeue(&sta->tx_filtered[ac]); 1266 if (!skb) { 1267 skb = skb_dequeue( 1268 &sta->ps_tx_buf[ac]); 1269 if (skb) 1270 local->total_ps_buffered--; 1271 } 1272 if (!skb) 1273 break; 1274 n_frames--; 1275 found = true; 1276 __skb_queue_tail(&frames, skb); 1277 } 1278 } 1279 1280 /* 1281 * If the driver has data on more than one TID then 1282 * certainly there's more data if we release just a 1283 * single frame now (from a single TID). 1284 */ 1285 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL && 1286 hweight16(driver_release_tids) > 1) { 1287 more_data = true; 1288 driver_release_tids = 1289 BIT(ffs(driver_release_tids) - 1); 1290 break; 1291 } 1292 } 1293 1294 if (!skb_queue_empty(&sta->tx_filtered[ac]) || 1295 !skb_queue_empty(&sta->ps_tx_buf[ac])) { 1296 more_data = true; 1297 break; 1298 } 1299 } 1300 1301 if (!found) { 1302 int tid; 1303 1304 /* 1305 * For PS-Poll, this can only happen due to a race condition 1306 * when we set the TIM bit and the station notices it, but 1307 * before it can poll for the frame we expire it. 1308 * 1309 * For uAPSD, this is said in the standard (11.2.1.5 h): 1310 * At each unscheduled SP for a non-AP STA, the AP shall 1311 * attempt to transmit at least one MSDU or MMPDU, but no 1312 * more than the value specified in the Max SP Length field 1313 * in the QoS Capability element from delivery-enabled ACs, 1314 * that are destined for the non-AP STA. 1315 * 1316 * Since we have no other MSDU/MMPDU, transmit a QoS null frame. 1317 */ 1318 1319 /* This will evaluate to 1, 3, 5 or 7. */ 1320 tid = 7 - ((ffs(~ignored_acs) - 1) << 1); 1321 1322 ieee80211_send_null_response(sdata, sta, tid, 1323 reason == IEEE80211_FRAME_RELEASE_UAPSD); 1324 return; 1325 } 1326 1327 if (!driver_release_tids) { 1328 struct sk_buff_head pending; 1329 struct sk_buff *skb; 1330 1331 skb_queue_head_init(&pending); 1332 1333 while ((skb = __skb_dequeue(&frames))) { 1334 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1335 struct ieee80211_hdr *hdr = (void *) skb->data; 1336 1337 /* 1338 * Tell TX path to send this frame even though the 1339 * STA may still remain is PS mode after this frame 1340 * exchange. 1341 */ 1342 info->flags |= IEEE80211_TX_CTL_POLL_RESPONSE; 1343 1344 /* 1345 * Use MoreData flag to indicate whether there are 1346 * more buffered frames for this STA 1347 */ 1348 if (!more_data) 1349 hdr->frame_control &= 1350 cpu_to_le16(~IEEE80211_FCTL_MOREDATA); 1351 else 1352 hdr->frame_control |= 1353 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 1354 1355 if (reason == IEEE80211_FRAME_RELEASE_UAPSD && 1356 skb_queue_empty(&frames)) { 1357 /* set EOSP for the frame */ 1358 u8 *p = ieee80211_get_qos_ctl(hdr); 1359 *p |= IEEE80211_QOS_CTL_EOSP; 1360 info->flags |= IEEE80211_TX_STATUS_EOSP | 1361 IEEE80211_TX_CTL_REQ_TX_STATUS; 1362 } 1363 1364 __skb_queue_tail(&pending, skb); 1365 } 1366 1367 ieee80211_add_pending_skbs(local, &pending); 1368 1369 sta_info_recalc_tim(sta); 1370 } else { 1371 /* 1372 * We need to release a frame that is buffered somewhere in the 1373 * driver ... it'll have to handle that. 1374 * Note that, as per the comment above, it'll also have to see 1375 * if there is more than just one frame on the specific TID that 1376 * we're releasing from, and it needs to set the more-data bit 1377 * accordingly if we tell it that there's no more data. If we do 1378 * tell it there's more data, then of course the more-data bit 1379 * needs to be set anyway. 1380 */ 1381 drv_release_buffered_frames(local, sta, driver_release_tids, 1382 n_frames, reason, more_data); 1383 1384 /* 1385 * Note that we don't recalculate the TIM bit here as it would 1386 * most likely have no effect at all unless the driver told us 1387 * that the TID became empty before returning here from the 1388 * release function. 1389 * Either way, however, when the driver tells us that the TID 1390 * became empty we'll do the TIM recalculation. 1391 */ 1392 } 1393} 1394 1395void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta) 1396{ 1397 u8 ignore_for_response = sta->sta.uapsd_queues; 1398 1399 /* 1400 * If all ACs are delivery-enabled then we should reply 1401 * from any of them, if only some are enabled we reply 1402 * only from the non-enabled ones. 1403 */ 1404 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1) 1405 ignore_for_response = 0; 1406 1407 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response, 1408 IEEE80211_FRAME_RELEASE_PSPOLL); 1409} 1410 1411void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta) 1412{ 1413 int n_frames = sta->sta.max_sp; 1414 u8 delivery_enabled = sta->sta.uapsd_queues; 1415 1416 /* 1417 * If we ever grow support for TSPEC this might happen if 1418 * the TSPEC update from hostapd comes in between a trigger 1419 * frame setting WLAN_STA_UAPSD in the RX path and this 1420 * actually getting called. 1421 */ 1422 if (!delivery_enabled) 1423 return; 1424 1425 /* Ohh, finally, the service period starts :-) */ 1426 set_sta_flags(sta, WLAN_STA_SP); 1427 1428 switch (sta->sta.max_sp) { 1429 case 1: 1430 n_frames = 2; 1431 break; 1432 case 2: 1433 n_frames = 4; 1434 break; 1435 case 3: 1436 n_frames = 6; 1437 break; 1438 case 0: 1439 /* XXX: what is a good value? */ 1440 n_frames = 8; 1441 break; 1442 } 1443 1444 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled, 1445 IEEE80211_FRAME_RELEASE_UAPSD); 1446} 1447 1448void ieee80211_sta_block_awake(struct ieee80211_hw *hw, 1449 struct ieee80211_sta *pubsta, bool block) 1450{ 1451 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1452 1453 trace_api_sta_block_awake(sta->local, pubsta, block); 1454 1455 if (block) 1456 set_sta_flags(sta, WLAN_STA_PS_DRIVER); 1457 else if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) 1458 ieee80211_queue_work(hw, &sta->drv_unblock_wk); 1459} 1460EXPORT_SYMBOL(ieee80211_sta_block_awake); 1461 1462void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta, 1463 u8 tid, bool buffered) 1464{ 1465 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1466 1467 if (WARN_ON(tid >= STA_TID_NUM)) 1468 return; 1469 1470 if (buffered) 1471 set_bit(tid, &sta->driver_buffered_tids); 1472 else 1473 clear_bit(tid, &sta->driver_buffered_tids); 1474 1475 sta_info_recalc_tim(sta); 1476} 1477EXPORT_SYMBOL(ieee80211_sta_set_buffered); 1478