sta_info.c revision 499f42bb03a9bd8a23f73e7c3886f70f52e7edc5
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/etherdevice.h> 13#include <linux/netdevice.h> 14#include <linux/types.h> 15#include <linux/slab.h> 16#include <linux/skbuff.h> 17#include <linux/if_arp.h> 18#include <linux/timer.h> 19#include <linux/rtnetlink.h> 20 21#include <net/mac80211.h> 22#include "ieee80211_i.h" 23#include "driver-ops.h" 24#include "rate.h" 25#include "sta_info.h" 26#include "debugfs_sta.h" 27#include "mesh.h" 28#include "wme.h" 29 30/** 31 * DOC: STA information lifetime rules 32 * 33 * STA info structures (&struct sta_info) are managed in a hash table 34 * for faster lookup and a list for iteration. They are managed using 35 * RCU, i.e. access to the list and hash table is protected by RCU. 36 * 37 * Upon allocating a STA info structure with sta_info_alloc(), the caller 38 * owns that structure. It must then insert it into the hash table using 39 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter 40 * case (which acquires an rcu read section but must not be called from 41 * within one) will the pointer still be valid after the call. Note that 42 * the caller may not do much with the STA info before inserting it, in 43 * particular, it may not start any mesh peer link management or add 44 * encryption keys. 45 * 46 * When the insertion fails (sta_info_insert()) returns non-zero), the 47 * structure will have been freed by sta_info_insert()! 48 * 49 * Station entries are added by mac80211 when you establish a link with a 50 * peer. This means different things for the different type of interfaces 51 * we support. For a regular station this mean we add the AP sta when we 52 * receive an association response from the AP. For IBSS this occurs when 53 * get to know about a peer on the same IBSS. For WDS we add the sta for 54 * the peer immediately upon device open. When using AP mode we add stations 55 * for each respective station upon request from userspace through nl80211. 56 * 57 * In order to remove a STA info structure, various sta_info_destroy_*() 58 * calls are available. 59 * 60 * There is no concept of ownership on a STA entry, each structure is 61 * owned by the global hash table/list until it is removed. All users of 62 * the structure need to be RCU protected so that the structure won't be 63 * freed before they are done using it. 64 */ 65 66/* Caller must hold local->sta_mtx */ 67static int sta_info_hash_del(struct ieee80211_local *local, 68 struct sta_info *sta) 69{ 70 struct sta_info *s; 71 72 s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)], 73 lockdep_is_held(&local->sta_mtx)); 74 if (!s) 75 return -ENOENT; 76 if (s == sta) { 77 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], 78 s->hnext); 79 return 0; 80 } 81 82 while (rcu_access_pointer(s->hnext) && 83 rcu_access_pointer(s->hnext) != sta) 84 s = rcu_dereference_protected(s->hnext, 85 lockdep_is_held(&local->sta_mtx)); 86 if (rcu_access_pointer(s->hnext)) { 87 rcu_assign_pointer(s->hnext, sta->hnext); 88 return 0; 89 } 90 91 return -ENOENT; 92} 93 94/* protected by RCU */ 95struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata, 96 const u8 *addr) 97{ 98 struct ieee80211_local *local = sdata->local; 99 struct sta_info *sta; 100 101 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], 102 lockdep_is_held(&local->sta_mtx)); 103 while (sta) { 104 if (sta->sdata == sdata && 105 ether_addr_equal(sta->sta.addr, addr)) 106 break; 107 sta = rcu_dereference_check(sta->hnext, 108 lockdep_is_held(&local->sta_mtx)); 109 } 110 return sta; 111} 112 113/* 114 * Get sta info either from the specified interface 115 * or from one of its vlans 116 */ 117struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata, 118 const u8 *addr) 119{ 120 struct ieee80211_local *local = sdata->local; 121 struct sta_info *sta; 122 123 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], 124 lockdep_is_held(&local->sta_mtx)); 125 while (sta) { 126 if ((sta->sdata == sdata || 127 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) && 128 ether_addr_equal(sta->sta.addr, addr)) 129 break; 130 sta = rcu_dereference_check(sta->hnext, 131 lockdep_is_held(&local->sta_mtx)); 132 } 133 return sta; 134} 135 136struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, 137 int idx) 138{ 139 struct ieee80211_local *local = sdata->local; 140 struct sta_info *sta; 141 int i = 0; 142 143 list_for_each_entry_rcu(sta, &local->sta_list, list) { 144 if (sdata != sta->sdata) 145 continue; 146 if (i < idx) { 147 ++i; 148 continue; 149 } 150 return sta; 151 } 152 153 return NULL; 154} 155 156/** 157 * sta_info_free - free STA 158 * 159 * @local: pointer to the global information 160 * @sta: STA info to free 161 * 162 * This function must undo everything done by sta_info_alloc() 163 * that may happen before sta_info_insert(). It may only be 164 * called when sta_info_insert() has not been attempted (and 165 * if that fails, the station is freed anyway.) 166 */ 167void sta_info_free(struct ieee80211_local *local, struct sta_info *sta) 168{ 169 if (sta->rate_ctrl) 170 rate_control_free_sta(sta); 171 172#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 173 wiphy_debug(local->hw.wiphy, "Destroyed STA %pM\n", sta->sta.addr); 174#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 175 176 kfree(sta); 177} 178 179/* Caller must hold local->sta_mtx */ 180static void sta_info_hash_add(struct ieee80211_local *local, 181 struct sta_info *sta) 182{ 183 lockdep_assert_held(&local->sta_mtx); 184 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)]; 185 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta); 186} 187 188static void sta_unblock(struct work_struct *wk) 189{ 190 struct sta_info *sta; 191 192 sta = container_of(wk, struct sta_info, drv_unblock_wk); 193 194 if (sta->dead) 195 return; 196 197 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) { 198 local_bh_disable(); 199 ieee80211_sta_ps_deliver_wakeup(sta); 200 local_bh_enable(); 201 } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) { 202 clear_sta_flag(sta, WLAN_STA_PS_DRIVER); 203 204 local_bh_disable(); 205 ieee80211_sta_ps_deliver_poll_response(sta); 206 local_bh_enable(); 207 } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) { 208 clear_sta_flag(sta, WLAN_STA_PS_DRIVER); 209 210 local_bh_disable(); 211 ieee80211_sta_ps_deliver_uapsd(sta); 212 local_bh_enable(); 213 } else 214 clear_sta_flag(sta, WLAN_STA_PS_DRIVER); 215} 216 217static int sta_prepare_rate_control(struct ieee80211_local *local, 218 struct sta_info *sta, gfp_t gfp) 219{ 220 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) 221 return 0; 222 223 sta->rate_ctrl = local->rate_ctrl; 224 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, 225 &sta->sta, gfp); 226 if (!sta->rate_ctrl_priv) 227 return -ENOMEM; 228 229 return 0; 230} 231 232struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, 233 const u8 *addr, gfp_t gfp) 234{ 235 struct ieee80211_local *local = sdata->local; 236 struct sta_info *sta; 237 struct timespec uptime; 238 int i; 239 240 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp); 241 if (!sta) 242 return NULL; 243 244 spin_lock_init(&sta->lock); 245 INIT_WORK(&sta->drv_unblock_wk, sta_unblock); 246 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work); 247 mutex_init(&sta->ampdu_mlme.mtx); 248 249 memcpy(sta->sta.addr, addr, ETH_ALEN); 250 sta->local = local; 251 sta->sdata = sdata; 252 sta->last_rx = jiffies; 253 254 sta->sta_state = IEEE80211_STA_NONE; 255 256 do_posix_clock_monotonic_gettime(&uptime); 257 sta->last_connected = uptime.tv_sec; 258 ewma_init(&sta->avg_signal, 1024, 8); 259 260 if (sta_prepare_rate_control(local, sta, gfp)) { 261 kfree(sta); 262 return NULL; 263 } 264 265 for (i = 0; i < STA_TID_NUM; i++) { 266 /* 267 * timer_to_tid must be initialized with identity mapping 268 * to enable session_timer's data differentiation. See 269 * sta_rx_agg_session_timer_expired for usage. 270 */ 271 sta->timer_to_tid[i] = i; 272 } 273 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 274 skb_queue_head_init(&sta->ps_tx_buf[i]); 275 skb_queue_head_init(&sta->tx_filtered[i]); 276 } 277 278 for (i = 0; i < NUM_RX_DATA_QUEUES; i++) 279 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX); 280 281#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 282 wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr); 283#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 284 285#ifdef CONFIG_MAC80211_MESH 286 sta->plink_state = NL80211_PLINK_LISTEN; 287 init_timer(&sta->plink_timer); 288#endif 289 290 return sta; 291} 292 293static int sta_info_insert_check(struct sta_info *sta) 294{ 295 struct ieee80211_sub_if_data *sdata = sta->sdata; 296 297 /* 298 * Can't be a WARN_ON because it can be triggered through a race: 299 * something inserts a STA (on one CPU) without holding the RTNL 300 * and another CPU turns off the net device. 301 */ 302 if (unlikely(!ieee80211_sdata_running(sdata))) 303 return -ENETDOWN; 304 305 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) || 306 is_multicast_ether_addr(sta->sta.addr))) 307 return -EINVAL; 308 309 return 0; 310} 311 312static int sta_info_insert_drv_state(struct ieee80211_local *local, 313 struct ieee80211_sub_if_data *sdata, 314 struct sta_info *sta) 315{ 316 enum ieee80211_sta_state state; 317 int err = 0; 318 319 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) { 320 err = drv_sta_state(local, sdata, sta, state, state + 1); 321 if (err) 322 break; 323 } 324 325 if (!err) { 326 /* 327 * Drivers using legacy sta_add/sta_remove callbacks only 328 * get uploaded set to true after sta_add is called. 329 */ 330 if (!local->ops->sta_add) 331 sta->uploaded = true; 332 return 0; 333 } 334 335 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 336 pr_debug("%s: failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n", 337 sdata->name, sta->sta.addr, state + 1, err); 338 err = 0; 339 } 340 341 /* unwind on error */ 342 for (; state > IEEE80211_STA_NOTEXIST; state--) 343 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1)); 344 345 return err; 346} 347 348/* 349 * should be called with sta_mtx locked 350 * this function replaces the mutex lock 351 * with a RCU lock 352 */ 353static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU) 354{ 355 struct ieee80211_local *local = sta->local; 356 struct ieee80211_sub_if_data *sdata = sta->sdata; 357 struct station_info sinfo; 358 int err = 0; 359 360 lockdep_assert_held(&local->sta_mtx); 361 362 /* check if STA exists already */ 363 if (sta_info_get_bss(sdata, sta->sta.addr)) { 364 err = -EEXIST; 365 goto out_err; 366 } 367 368 /* notify driver */ 369 err = sta_info_insert_drv_state(local, sdata, sta); 370 if (err) 371 goto out_err; 372 373 local->num_sta++; 374 local->sta_generation++; 375 smp_mb(); 376 377 /* make the station visible */ 378 sta_info_hash_add(local, sta); 379 380 list_add(&sta->list, &local->sta_list); 381 382 set_sta_flag(sta, WLAN_STA_INSERTED); 383 384 ieee80211_sta_debugfs_add(sta); 385 rate_control_add_sta_debugfs(sta); 386 387 memset(&sinfo, 0, sizeof(sinfo)); 388 sinfo.filled = 0; 389 sinfo.generation = local->sta_generation; 390 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL); 391 392#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 393 wiphy_debug(local->hw.wiphy, "Inserted STA %pM\n", sta->sta.addr); 394#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 395 396 /* move reference to rcu-protected */ 397 rcu_read_lock(); 398 mutex_unlock(&local->sta_mtx); 399 400 if (ieee80211_vif_is_mesh(&sdata->vif)) 401 mesh_accept_plinks_update(sdata); 402 403 return 0; 404 out_err: 405 mutex_unlock(&local->sta_mtx); 406 rcu_read_lock(); 407 return err; 408} 409 410int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU) 411{ 412 struct ieee80211_local *local = sta->local; 413 int err = 0; 414 415 might_sleep(); 416 417 err = sta_info_insert_check(sta); 418 if (err) { 419 rcu_read_lock(); 420 goto out_free; 421 } 422 423 mutex_lock(&local->sta_mtx); 424 425 err = sta_info_insert_finish(sta); 426 if (err) 427 goto out_free; 428 429 return 0; 430 out_free: 431 BUG_ON(!err); 432 sta_info_free(local, sta); 433 return err; 434} 435 436int sta_info_insert(struct sta_info *sta) 437{ 438 int err = sta_info_insert_rcu(sta); 439 440 rcu_read_unlock(); 441 442 return err; 443} 444 445static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid) 446{ 447 /* 448 * This format has been mandated by the IEEE specifications, 449 * so this line may not be changed to use the __set_bit() format. 450 */ 451 bss->tim[aid / 8] |= (1 << (aid % 8)); 452} 453 454static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid) 455{ 456 /* 457 * This format has been mandated by the IEEE specifications, 458 * so this line may not be changed to use the __clear_bit() format. 459 */ 460 bss->tim[aid / 8] &= ~(1 << (aid % 8)); 461} 462 463static unsigned long ieee80211_tids_for_ac(int ac) 464{ 465 /* If we ever support TIDs > 7, this obviously needs to be adjusted */ 466 switch (ac) { 467 case IEEE80211_AC_VO: 468 return BIT(6) | BIT(7); 469 case IEEE80211_AC_VI: 470 return BIT(4) | BIT(5); 471 case IEEE80211_AC_BE: 472 return BIT(0) | BIT(3); 473 case IEEE80211_AC_BK: 474 return BIT(1) | BIT(2); 475 default: 476 WARN_ON(1); 477 return 0; 478 } 479} 480 481void sta_info_recalc_tim(struct sta_info *sta) 482{ 483 struct ieee80211_local *local = sta->local; 484 struct ieee80211_if_ap *bss = sta->sdata->bss; 485 unsigned long flags; 486 bool indicate_tim = false; 487 u8 ignore_for_tim = sta->sta.uapsd_queues; 488 int ac; 489 490 if (WARN_ON_ONCE(!sta->sdata->bss)) 491 return; 492 493 /* No need to do anything if the driver does all */ 494 if (local->hw.flags & IEEE80211_HW_AP_LINK_PS) 495 return; 496 497 if (sta->dead) 498 goto done; 499 500 /* 501 * If all ACs are delivery-enabled then we should build 502 * the TIM bit for all ACs anyway; if only some are then 503 * we ignore those and build the TIM bit using only the 504 * non-enabled ones. 505 */ 506 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1) 507 ignore_for_tim = 0; 508 509 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 510 unsigned long tids; 511 512 if (ignore_for_tim & BIT(ac)) 513 continue; 514 515 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) || 516 !skb_queue_empty(&sta->ps_tx_buf[ac]); 517 if (indicate_tim) 518 break; 519 520 tids = ieee80211_tids_for_ac(ac); 521 522 indicate_tim |= 523 sta->driver_buffered_tids & tids; 524 } 525 526 done: 527 spin_lock_irqsave(&local->tim_lock, flags); 528 529 if (indicate_tim) 530 __bss_tim_set(bss, sta->sta.aid); 531 else 532 __bss_tim_clear(bss, sta->sta.aid); 533 534 if (local->ops->set_tim) { 535 local->tim_in_locked_section = true; 536 drv_set_tim(local, &sta->sta, indicate_tim); 537 local->tim_in_locked_section = false; 538 } 539 540 spin_unlock_irqrestore(&local->tim_lock, flags); 541} 542 543static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb) 544{ 545 struct ieee80211_tx_info *info; 546 int timeout; 547 548 if (!skb) 549 return false; 550 551 info = IEEE80211_SKB_CB(skb); 552 553 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ 554 timeout = (sta->listen_interval * 555 sta->sdata->vif.bss_conf.beacon_int * 556 32 / 15625) * HZ; 557 if (timeout < STA_TX_BUFFER_EXPIRE) 558 timeout = STA_TX_BUFFER_EXPIRE; 559 return time_after(jiffies, info->control.jiffies + timeout); 560} 561 562 563static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local, 564 struct sta_info *sta, int ac) 565{ 566 unsigned long flags; 567 struct sk_buff *skb; 568 569 /* 570 * First check for frames that should expire on the filtered 571 * queue. Frames here were rejected by the driver and are on 572 * a separate queue to avoid reordering with normal PS-buffered 573 * frames. They also aren't accounted for right now in the 574 * total_ps_buffered counter. 575 */ 576 for (;;) { 577 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags); 578 skb = skb_peek(&sta->tx_filtered[ac]); 579 if (sta_info_buffer_expired(sta, skb)) 580 skb = __skb_dequeue(&sta->tx_filtered[ac]); 581 else 582 skb = NULL; 583 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags); 584 585 /* 586 * Frames are queued in order, so if this one 587 * hasn't expired yet we can stop testing. If 588 * we actually reached the end of the queue we 589 * also need to stop, of course. 590 */ 591 if (!skb) 592 break; 593 dev_kfree_skb(skb); 594 } 595 596 /* 597 * Now also check the normal PS-buffered queue, this will 598 * only find something if the filtered queue was emptied 599 * since the filtered frames are all before the normal PS 600 * buffered frames. 601 */ 602 for (;;) { 603 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags); 604 skb = skb_peek(&sta->ps_tx_buf[ac]); 605 if (sta_info_buffer_expired(sta, skb)) 606 skb = __skb_dequeue(&sta->ps_tx_buf[ac]); 607 else 608 skb = NULL; 609 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags); 610 611 /* 612 * frames are queued in order, so if this one 613 * hasn't expired yet (or we reached the end of 614 * the queue) we can stop testing 615 */ 616 if (!skb) 617 break; 618 619 local->total_ps_buffered--; 620#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 621 pr_debug("Buffered frame expired (STA %pM)\n", sta->sta.addr); 622#endif 623 dev_kfree_skb(skb); 624 } 625 626 /* 627 * Finally, recalculate the TIM bit for this station -- it might 628 * now be clear because the station was too slow to retrieve its 629 * frames. 630 */ 631 sta_info_recalc_tim(sta); 632 633 /* 634 * Return whether there are any frames still buffered, this is 635 * used to check whether the cleanup timer still needs to run, 636 * if there are no frames we don't need to rearm the timer. 637 */ 638 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) && 639 skb_queue_empty(&sta->tx_filtered[ac])); 640} 641 642static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local, 643 struct sta_info *sta) 644{ 645 bool have_buffered = false; 646 int ac; 647 648 /* This is only necessary for stations on BSS interfaces */ 649 if (!sta->sdata->bss) 650 return false; 651 652 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 653 have_buffered |= 654 sta_info_cleanup_expire_buffered_ac(local, sta, ac); 655 656 return have_buffered; 657} 658 659int __must_check __sta_info_destroy(struct sta_info *sta) 660{ 661 struct ieee80211_local *local; 662 struct ieee80211_sub_if_data *sdata; 663 int ret, i, ac; 664 struct tid_ampdu_tx *tid_tx; 665 666 might_sleep(); 667 668 if (!sta) 669 return -ENOENT; 670 671 local = sta->local; 672 sdata = sta->sdata; 673 674 lockdep_assert_held(&local->sta_mtx); 675 676 /* 677 * Before removing the station from the driver and 678 * rate control, it might still start new aggregation 679 * sessions -- block that to make sure the tear-down 680 * will be sufficient. 681 */ 682 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 683 ieee80211_sta_tear_down_BA_sessions(sta, true); 684 685 ret = sta_info_hash_del(local, sta); 686 if (ret) 687 return ret; 688 689 list_del(&sta->list); 690 691 mutex_lock(&local->key_mtx); 692 for (i = 0; i < NUM_DEFAULT_KEYS; i++) 693 __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i])); 694 if (sta->ptk) 695 __ieee80211_key_free(key_mtx_dereference(local, sta->ptk)); 696 mutex_unlock(&local->key_mtx); 697 698 sta->dead = true; 699 700 local->num_sta--; 701 local->sta_generation++; 702 703 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 704 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL); 705 706 while (sta->sta_state > IEEE80211_STA_NONE) { 707 ret = sta_info_move_state(sta, sta->sta_state - 1); 708 if (ret) { 709 WARN_ON_ONCE(1); 710 break; 711 } 712 } 713 714 if (sta->uploaded) { 715 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE, 716 IEEE80211_STA_NOTEXIST); 717 WARN_ON_ONCE(ret != 0); 718 } 719 720 /* 721 * At this point, after we wait for an RCU grace period, 722 * neither mac80211 nor the driver can reference this 723 * sta struct any more except by still existing timers 724 * associated with this station that we clean up below. 725 */ 726 synchronize_rcu(); 727 728 if (test_sta_flag(sta, WLAN_STA_PS_STA)) { 729 BUG_ON(!sdata->bss); 730 731 clear_sta_flag(sta, WLAN_STA_PS_STA); 732 733 atomic_dec(&sdata->bss->num_sta_ps); 734 sta_info_recalc_tim(sta); 735 } 736 737 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 738 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]); 739 __skb_queue_purge(&sta->ps_tx_buf[ac]); 740 __skb_queue_purge(&sta->tx_filtered[ac]); 741 } 742 743#ifdef CONFIG_MAC80211_MESH 744 if (ieee80211_vif_is_mesh(&sdata->vif)) 745 mesh_accept_plinks_update(sdata); 746#endif 747 748#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 749 wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr); 750#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 751 cancel_work_sync(&sta->drv_unblock_wk); 752 753 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL); 754 755 rate_control_remove_sta_debugfs(sta); 756 ieee80211_sta_debugfs_remove(sta); 757 758#ifdef CONFIG_MAC80211_MESH 759 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) { 760 mesh_plink_deactivate(sta); 761 del_timer_sync(&sta->plink_timer); 762 } 763#endif 764 765 /* 766 * Destroy aggregation state here. It would be nice to wait for the 767 * driver to finish aggregation stop and then clean up, but for now 768 * drivers have to handle aggregation stop being requested, followed 769 * directly by station destruction. 770 */ 771 for (i = 0; i < STA_TID_NUM; i++) { 772 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]); 773 if (!tid_tx) 774 continue; 775 __skb_queue_purge(&tid_tx->pending); 776 kfree(tid_tx); 777 } 778 779 sta_info_free(local, sta); 780 781 return 0; 782} 783 784int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr) 785{ 786 struct sta_info *sta; 787 int ret; 788 789 mutex_lock(&sdata->local->sta_mtx); 790 sta = sta_info_get(sdata, addr); 791 ret = __sta_info_destroy(sta); 792 mutex_unlock(&sdata->local->sta_mtx); 793 794 return ret; 795} 796 797int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata, 798 const u8 *addr) 799{ 800 struct sta_info *sta; 801 int ret; 802 803 mutex_lock(&sdata->local->sta_mtx); 804 sta = sta_info_get_bss(sdata, addr); 805 ret = __sta_info_destroy(sta); 806 mutex_unlock(&sdata->local->sta_mtx); 807 808 return ret; 809} 810 811static void sta_info_cleanup(unsigned long data) 812{ 813 struct ieee80211_local *local = (struct ieee80211_local *) data; 814 struct sta_info *sta; 815 bool timer_needed = false; 816 817 rcu_read_lock(); 818 list_for_each_entry_rcu(sta, &local->sta_list, list) 819 if (sta_info_cleanup_expire_buffered(local, sta)) 820 timer_needed = true; 821 rcu_read_unlock(); 822 823 if (local->quiescing) 824 return; 825 826 if (!timer_needed) 827 return; 828 829 mod_timer(&local->sta_cleanup, 830 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL)); 831} 832 833void sta_info_init(struct ieee80211_local *local) 834{ 835 spin_lock_init(&local->tim_lock); 836 mutex_init(&local->sta_mtx); 837 INIT_LIST_HEAD(&local->sta_list); 838 839 setup_timer(&local->sta_cleanup, sta_info_cleanup, 840 (unsigned long)local); 841} 842 843void sta_info_stop(struct ieee80211_local *local) 844{ 845 del_timer(&local->sta_cleanup); 846 sta_info_flush(local, NULL); 847} 848 849/** 850 * sta_info_flush - flush matching STA entries from the STA table 851 * 852 * Returns the number of removed STA entries. 853 * 854 * @local: local interface data 855 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs 856 */ 857int sta_info_flush(struct ieee80211_local *local, 858 struct ieee80211_sub_if_data *sdata) 859{ 860 struct sta_info *sta, *tmp; 861 int ret = 0; 862 863 might_sleep(); 864 865 mutex_lock(&local->sta_mtx); 866 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 867 if (!sdata || sdata == sta->sdata) { 868 WARN_ON(__sta_info_destroy(sta)); 869 ret++; 870 } 871 } 872 mutex_unlock(&local->sta_mtx); 873 874 return ret; 875} 876 877void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, 878 unsigned long exp_time) 879{ 880 struct ieee80211_local *local = sdata->local; 881 struct sta_info *sta, *tmp; 882 883 mutex_lock(&local->sta_mtx); 884 885 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 886 if (sdata != sta->sdata) 887 continue; 888 889 if (time_after(jiffies, sta->last_rx + exp_time)) { 890 ibss_vdbg("%s: expiring inactive STA %pM\n", 891 sdata->name, sta->sta.addr); 892 WARN_ON(__sta_info_destroy(sta)); 893 } 894 } 895 896 mutex_unlock(&local->sta_mtx); 897} 898 899struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw, 900 const u8 *addr, 901 const u8 *localaddr) 902{ 903 struct sta_info *sta, *nxt; 904 905 /* 906 * Just return a random station if localaddr is NULL 907 * ... first in list. 908 */ 909 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) { 910 if (localaddr && 911 !ether_addr_equal(sta->sdata->vif.addr, localaddr)) 912 continue; 913 if (!sta->uploaded) 914 return NULL; 915 return &sta->sta; 916 } 917 918 return NULL; 919} 920EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr); 921 922struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif, 923 const u8 *addr) 924{ 925 struct sta_info *sta; 926 927 if (!vif) 928 return NULL; 929 930 sta = sta_info_get_bss(vif_to_sdata(vif), addr); 931 if (!sta) 932 return NULL; 933 934 if (!sta->uploaded) 935 return NULL; 936 937 return &sta->sta; 938} 939EXPORT_SYMBOL(ieee80211_find_sta); 940 941static void clear_sta_ps_flags(void *_sta) 942{ 943 struct sta_info *sta = _sta; 944 struct ieee80211_sub_if_data *sdata = sta->sdata; 945 946 clear_sta_flag(sta, WLAN_STA_PS_DRIVER); 947 if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA)) 948 atomic_dec(&sdata->bss->num_sta_ps); 949} 950 951/* powersave support code */ 952void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta) 953{ 954 struct ieee80211_sub_if_data *sdata = sta->sdata; 955 struct ieee80211_local *local = sdata->local; 956 struct sk_buff_head pending; 957 int filtered = 0, buffered = 0, ac; 958 959 clear_sta_flag(sta, WLAN_STA_SP); 960 961 BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM) > 1); 962 sta->driver_buffered_tids = 0; 963 964 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) 965 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta); 966 967 skb_queue_head_init(&pending); 968 969 /* Send all buffered frames to the station */ 970 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 971 int count = skb_queue_len(&pending), tmp; 972 973 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending); 974 tmp = skb_queue_len(&pending); 975 filtered += tmp - count; 976 count = tmp; 977 978 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending); 979 tmp = skb_queue_len(&pending); 980 buffered += tmp - count; 981 } 982 983 ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta); 984 985 local->total_ps_buffered -= buffered; 986 987 sta_info_recalc_tim(sta); 988 989#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 990 pr_debug("%s: STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n", 991 sdata->name, sta->sta.addr, sta->sta.aid, filtered, buffered); 992#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 993} 994 995static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata, 996 struct sta_info *sta, int tid, 997 enum ieee80211_frame_release_type reason) 998{ 999 struct ieee80211_local *local = sdata->local; 1000 struct ieee80211_qos_hdr *nullfunc; 1001 struct sk_buff *skb; 1002 int size = sizeof(*nullfunc); 1003 __le16 fc; 1004 bool qos = test_sta_flag(sta, WLAN_STA_WME); 1005 struct ieee80211_tx_info *info; 1006 1007 if (qos) { 1008 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | 1009 IEEE80211_STYPE_QOS_NULLFUNC | 1010 IEEE80211_FCTL_FROMDS); 1011 } else { 1012 size -= 2; 1013 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | 1014 IEEE80211_STYPE_NULLFUNC | 1015 IEEE80211_FCTL_FROMDS); 1016 } 1017 1018 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size); 1019 if (!skb) 1020 return; 1021 1022 skb_reserve(skb, local->hw.extra_tx_headroom); 1023 1024 nullfunc = (void *) skb_put(skb, size); 1025 nullfunc->frame_control = fc; 1026 nullfunc->duration_id = 0; 1027 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN); 1028 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 1029 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN); 1030 1031 skb->priority = tid; 1032 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]); 1033 if (qos) { 1034 nullfunc->qos_ctrl = cpu_to_le16(tid); 1035 1036 if (reason == IEEE80211_FRAME_RELEASE_UAPSD) 1037 nullfunc->qos_ctrl |= 1038 cpu_to_le16(IEEE80211_QOS_CTL_EOSP); 1039 } 1040 1041 info = IEEE80211_SKB_CB(skb); 1042 1043 /* 1044 * Tell TX path to send this frame even though the 1045 * STA may still remain is PS mode after this frame 1046 * exchange. Also set EOSP to indicate this packet 1047 * ends the poll/service period. 1048 */ 1049 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER | 1050 IEEE80211_TX_STATUS_EOSP | 1051 IEEE80211_TX_CTL_REQ_TX_STATUS; 1052 1053 drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false); 1054 1055 ieee80211_xmit(sdata, skb); 1056} 1057 1058static void 1059ieee80211_sta_ps_deliver_response(struct sta_info *sta, 1060 int n_frames, u8 ignored_acs, 1061 enum ieee80211_frame_release_type reason) 1062{ 1063 struct ieee80211_sub_if_data *sdata = sta->sdata; 1064 struct ieee80211_local *local = sdata->local; 1065 bool found = false; 1066 bool more_data = false; 1067 int ac; 1068 unsigned long driver_release_tids = 0; 1069 struct sk_buff_head frames; 1070 1071 /* Service or PS-Poll period starts */ 1072 set_sta_flag(sta, WLAN_STA_SP); 1073 1074 __skb_queue_head_init(&frames); 1075 1076 /* 1077 * Get response frame(s) and more data bit for it. 1078 */ 1079 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1080 unsigned long tids; 1081 1082 if (ignored_acs & BIT(ac)) 1083 continue; 1084 1085 tids = ieee80211_tids_for_ac(ac); 1086 1087 if (!found) { 1088 driver_release_tids = sta->driver_buffered_tids & tids; 1089 if (driver_release_tids) { 1090 found = true; 1091 } else { 1092 struct sk_buff *skb; 1093 1094 while (n_frames > 0) { 1095 skb = skb_dequeue(&sta->tx_filtered[ac]); 1096 if (!skb) { 1097 skb = skb_dequeue( 1098 &sta->ps_tx_buf[ac]); 1099 if (skb) 1100 local->total_ps_buffered--; 1101 } 1102 if (!skb) 1103 break; 1104 n_frames--; 1105 found = true; 1106 __skb_queue_tail(&frames, skb); 1107 } 1108 } 1109 1110 /* 1111 * If the driver has data on more than one TID then 1112 * certainly there's more data if we release just a 1113 * single frame now (from a single TID). 1114 */ 1115 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL && 1116 hweight16(driver_release_tids) > 1) { 1117 more_data = true; 1118 driver_release_tids = 1119 BIT(ffs(driver_release_tids) - 1); 1120 break; 1121 } 1122 } 1123 1124 if (!skb_queue_empty(&sta->tx_filtered[ac]) || 1125 !skb_queue_empty(&sta->ps_tx_buf[ac])) { 1126 more_data = true; 1127 break; 1128 } 1129 } 1130 1131 if (!found) { 1132 int tid; 1133 1134 /* 1135 * For PS-Poll, this can only happen due to a race condition 1136 * when we set the TIM bit and the station notices it, but 1137 * before it can poll for the frame we expire it. 1138 * 1139 * For uAPSD, this is said in the standard (11.2.1.5 h): 1140 * At each unscheduled SP for a non-AP STA, the AP shall 1141 * attempt to transmit at least one MSDU or MMPDU, but no 1142 * more than the value specified in the Max SP Length field 1143 * in the QoS Capability element from delivery-enabled ACs, 1144 * that are destined for the non-AP STA. 1145 * 1146 * Since we have no other MSDU/MMPDU, transmit a QoS null frame. 1147 */ 1148 1149 /* This will evaluate to 1, 3, 5 or 7. */ 1150 tid = 7 - ((ffs(~ignored_acs) - 1) << 1); 1151 1152 ieee80211_send_null_response(sdata, sta, tid, reason); 1153 return; 1154 } 1155 1156 if (!driver_release_tids) { 1157 struct sk_buff_head pending; 1158 struct sk_buff *skb; 1159 int num = 0; 1160 u16 tids = 0; 1161 1162 skb_queue_head_init(&pending); 1163 1164 while ((skb = __skb_dequeue(&frames))) { 1165 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1166 struct ieee80211_hdr *hdr = (void *) skb->data; 1167 u8 *qoshdr = NULL; 1168 1169 num++; 1170 1171 /* 1172 * Tell TX path to send this frame even though the 1173 * STA may still remain is PS mode after this frame 1174 * exchange. 1175 */ 1176 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 1177 1178 /* 1179 * Use MoreData flag to indicate whether there are 1180 * more buffered frames for this STA 1181 */ 1182 if (more_data || !skb_queue_empty(&frames)) 1183 hdr->frame_control |= 1184 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 1185 else 1186 hdr->frame_control &= 1187 cpu_to_le16(~IEEE80211_FCTL_MOREDATA); 1188 1189 if (ieee80211_is_data_qos(hdr->frame_control) || 1190 ieee80211_is_qos_nullfunc(hdr->frame_control)) 1191 qoshdr = ieee80211_get_qos_ctl(hdr); 1192 1193 /* end service period after last frame */ 1194 if (skb_queue_empty(&frames)) { 1195 if (reason == IEEE80211_FRAME_RELEASE_UAPSD && 1196 qoshdr) 1197 *qoshdr |= IEEE80211_QOS_CTL_EOSP; 1198 1199 info->flags |= IEEE80211_TX_STATUS_EOSP | 1200 IEEE80211_TX_CTL_REQ_TX_STATUS; 1201 } 1202 1203 if (qoshdr) 1204 tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK); 1205 else 1206 tids |= BIT(0); 1207 1208 __skb_queue_tail(&pending, skb); 1209 } 1210 1211 drv_allow_buffered_frames(local, sta, tids, num, 1212 reason, more_data); 1213 1214 ieee80211_add_pending_skbs(local, &pending); 1215 1216 sta_info_recalc_tim(sta); 1217 } else { 1218 /* 1219 * We need to release a frame that is buffered somewhere in the 1220 * driver ... it'll have to handle that. 1221 * Note that, as per the comment above, it'll also have to see 1222 * if there is more than just one frame on the specific TID that 1223 * we're releasing from, and it needs to set the more-data bit 1224 * accordingly if we tell it that there's no more data. If we do 1225 * tell it there's more data, then of course the more-data bit 1226 * needs to be set anyway. 1227 */ 1228 drv_release_buffered_frames(local, sta, driver_release_tids, 1229 n_frames, reason, more_data); 1230 1231 /* 1232 * Note that we don't recalculate the TIM bit here as it would 1233 * most likely have no effect at all unless the driver told us 1234 * that the TID became empty before returning here from the 1235 * release function. 1236 * Either way, however, when the driver tells us that the TID 1237 * became empty we'll do the TIM recalculation. 1238 */ 1239 } 1240} 1241 1242void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta) 1243{ 1244 u8 ignore_for_response = sta->sta.uapsd_queues; 1245 1246 /* 1247 * If all ACs are delivery-enabled then we should reply 1248 * from any of them, if only some are enabled we reply 1249 * only from the non-enabled ones. 1250 */ 1251 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1) 1252 ignore_for_response = 0; 1253 1254 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response, 1255 IEEE80211_FRAME_RELEASE_PSPOLL); 1256} 1257 1258void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta) 1259{ 1260 int n_frames = sta->sta.max_sp; 1261 u8 delivery_enabled = sta->sta.uapsd_queues; 1262 1263 /* 1264 * If we ever grow support for TSPEC this might happen if 1265 * the TSPEC update from hostapd comes in between a trigger 1266 * frame setting WLAN_STA_UAPSD in the RX path and this 1267 * actually getting called. 1268 */ 1269 if (!delivery_enabled) 1270 return; 1271 1272 switch (sta->sta.max_sp) { 1273 case 1: 1274 n_frames = 2; 1275 break; 1276 case 2: 1277 n_frames = 4; 1278 break; 1279 case 3: 1280 n_frames = 6; 1281 break; 1282 case 0: 1283 /* XXX: what is a good value? */ 1284 n_frames = 8; 1285 break; 1286 } 1287 1288 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled, 1289 IEEE80211_FRAME_RELEASE_UAPSD); 1290} 1291 1292void ieee80211_sta_block_awake(struct ieee80211_hw *hw, 1293 struct ieee80211_sta *pubsta, bool block) 1294{ 1295 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1296 1297 trace_api_sta_block_awake(sta->local, pubsta, block); 1298 1299 if (block) 1300 set_sta_flag(sta, WLAN_STA_PS_DRIVER); 1301 else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1302 ieee80211_queue_work(hw, &sta->drv_unblock_wk); 1303} 1304EXPORT_SYMBOL(ieee80211_sta_block_awake); 1305 1306void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta) 1307{ 1308 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1309 struct ieee80211_local *local = sta->local; 1310 struct sk_buff *skb; 1311 struct skb_eosp_msg_data *data; 1312 1313 trace_api_eosp(local, pubsta); 1314 1315 skb = alloc_skb(0, GFP_ATOMIC); 1316 if (!skb) { 1317 /* too bad ... but race is better than loss */ 1318 clear_sta_flag(sta, WLAN_STA_SP); 1319 return; 1320 } 1321 1322 data = (void *)skb->cb; 1323 memcpy(data->sta, pubsta->addr, ETH_ALEN); 1324 memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN); 1325 skb->pkt_type = IEEE80211_EOSP_MSG; 1326 skb_queue_tail(&local->skb_queue, skb); 1327 tasklet_schedule(&local->tasklet); 1328} 1329EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe); 1330 1331void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta, 1332 u8 tid, bool buffered) 1333{ 1334 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1335 1336 if (WARN_ON(tid >= STA_TID_NUM)) 1337 return; 1338 1339 if (buffered) 1340 set_bit(tid, &sta->driver_buffered_tids); 1341 else 1342 clear_bit(tid, &sta->driver_buffered_tids); 1343 1344 sta_info_recalc_tim(sta); 1345} 1346EXPORT_SYMBOL(ieee80211_sta_set_buffered); 1347 1348int sta_info_move_state(struct sta_info *sta, 1349 enum ieee80211_sta_state new_state) 1350{ 1351 might_sleep(); 1352 1353 if (sta->sta_state == new_state) 1354 return 0; 1355 1356 /* check allowed transitions first */ 1357 1358 switch (new_state) { 1359 case IEEE80211_STA_NONE: 1360 if (sta->sta_state != IEEE80211_STA_AUTH) 1361 return -EINVAL; 1362 break; 1363 case IEEE80211_STA_AUTH: 1364 if (sta->sta_state != IEEE80211_STA_NONE && 1365 sta->sta_state != IEEE80211_STA_ASSOC) 1366 return -EINVAL; 1367 break; 1368 case IEEE80211_STA_ASSOC: 1369 if (sta->sta_state != IEEE80211_STA_AUTH && 1370 sta->sta_state != IEEE80211_STA_AUTHORIZED) 1371 return -EINVAL; 1372 break; 1373 case IEEE80211_STA_AUTHORIZED: 1374 if (sta->sta_state != IEEE80211_STA_ASSOC) 1375 return -EINVAL; 1376 break; 1377 default: 1378 WARN(1, "invalid state %d", new_state); 1379 return -EINVAL; 1380 } 1381 1382#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1383 pr_debug("%s: moving STA %pM to state %d\n", 1384 sta->sdata->name, sta->sta.addr, new_state); 1385#endif 1386 1387 /* 1388 * notify the driver before the actual changes so it can 1389 * fail the transition 1390 */ 1391 if (test_sta_flag(sta, WLAN_STA_INSERTED)) { 1392 int err = drv_sta_state(sta->local, sta->sdata, sta, 1393 sta->sta_state, new_state); 1394 if (err) 1395 return err; 1396 } 1397 1398 /* reflect the change in all state variables */ 1399 1400 switch (new_state) { 1401 case IEEE80211_STA_NONE: 1402 if (sta->sta_state == IEEE80211_STA_AUTH) 1403 clear_bit(WLAN_STA_AUTH, &sta->_flags); 1404 break; 1405 case IEEE80211_STA_AUTH: 1406 if (sta->sta_state == IEEE80211_STA_NONE) 1407 set_bit(WLAN_STA_AUTH, &sta->_flags); 1408 else if (sta->sta_state == IEEE80211_STA_ASSOC) 1409 clear_bit(WLAN_STA_ASSOC, &sta->_flags); 1410 break; 1411 case IEEE80211_STA_ASSOC: 1412 if (sta->sta_state == IEEE80211_STA_AUTH) { 1413 set_bit(WLAN_STA_ASSOC, &sta->_flags); 1414 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) { 1415 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1416 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1417 !sta->sdata->u.vlan.sta)) 1418 atomic_dec(&sta->sdata->bss->num_mcast_sta); 1419 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags); 1420 } 1421 break; 1422 case IEEE80211_STA_AUTHORIZED: 1423 if (sta->sta_state == IEEE80211_STA_ASSOC) { 1424 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1425 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1426 !sta->sdata->u.vlan.sta)) 1427 atomic_inc(&sta->sdata->bss->num_mcast_sta); 1428 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags); 1429 } 1430 break; 1431 default: 1432 break; 1433 } 1434 1435 sta->sta_state = new_state; 1436 1437 return 0; 1438} 1439