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 */ 67 static 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 static void cleanup_single_sta(struct sta_info *sta) 95 { 96 int ac, i; 97 struct tid_ampdu_tx *tid_tx; 98 struct ieee80211_sub_if_data *sdata = sta->sdata; 99 struct ieee80211_local *local = sdata->local; 100 struct ps_data *ps; 101 102 /* 103 * At this point, when being called as call_rcu callback, 104 * neither mac80211 nor the driver can reference this 105 * sta struct any more except by still existing timers 106 * associated with this station that we clean up below. 107 * 108 * Note though that this still uses the sdata and even 109 * calls the driver in AP and mesh mode, so interfaces 110 * of those types mush use call sta_info_flush_cleanup() 111 * (typically via sta_info_flush()) before deconfiguring 112 * the driver. 113 * 114 * In station mode, nothing happens here so it doesn't 115 * have to (and doesn't) do that, this is intentional to 116 * speed up roaming. 117 */ 118 119 if (test_sta_flag(sta, WLAN_STA_PS_STA)) { 120 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 121 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 122 ps = &sdata->bss->ps; 123 else if (ieee80211_vif_is_mesh(&sdata->vif)) 124 ps = &sdata->u.mesh.ps; 125 else 126 return; 127 128 clear_sta_flag(sta, WLAN_STA_PS_STA); 129 130 atomic_dec(&ps->num_sta_ps); 131 sta_info_recalc_tim(sta); 132 } 133 134 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 135 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]); 136 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]); 137 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]); 138 } 139 140 if (ieee80211_vif_is_mesh(&sdata->vif)) 141 mesh_sta_cleanup(sta); 142 143 cancel_work_sync(&sta->drv_unblock_wk); 144 145 /* 146 * Destroy aggregation state here. It would be nice to wait for the 147 * driver to finish aggregation stop and then clean up, but for now 148 * drivers have to handle aggregation stop being requested, followed 149 * directly by station destruction. 150 */ 151 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 152 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]); 153 if (!tid_tx) 154 continue; 155 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending); 156 kfree(tid_tx); 157 } 158 159 sta_info_free(local, sta); 160 } 161 162 void ieee80211_cleanup_sdata_stas(struct ieee80211_sub_if_data *sdata) 163 { 164 struct sta_info *sta; 165 166 spin_lock_bh(&sdata->cleanup_stations_lock); 167 while (!list_empty(&sdata->cleanup_stations)) { 168 sta = list_first_entry(&sdata->cleanup_stations, 169 struct sta_info, list); 170 list_del(&sta->list); 171 spin_unlock_bh(&sdata->cleanup_stations_lock); 172 173 cleanup_single_sta(sta); 174 175 spin_lock_bh(&sdata->cleanup_stations_lock); 176 } 177 178 spin_unlock_bh(&sdata->cleanup_stations_lock); 179 } 180 181 static void free_sta_rcu(struct rcu_head *h) 182 { 183 struct sta_info *sta = container_of(h, struct sta_info, rcu_head); 184 struct ieee80211_sub_if_data *sdata = sta->sdata; 185 186 spin_lock(&sdata->cleanup_stations_lock); 187 list_add_tail(&sta->list, &sdata->cleanup_stations); 188 spin_unlock(&sdata->cleanup_stations_lock); 189 190 ieee80211_queue_work(&sdata->local->hw, &sdata->cleanup_stations_wk); 191 } 192 193 /* protected by RCU */ 194 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata, 195 const u8 *addr) 196 { 197 struct ieee80211_local *local = sdata->local; 198 struct sta_info *sta; 199 200 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], 201 lockdep_is_held(&local->sta_mtx)); 202 while (sta) { 203 if (sta->sdata == sdata && 204 ether_addr_equal(sta->sta.addr, addr)) 205 break; 206 sta = rcu_dereference_check(sta->hnext, 207 lockdep_is_held(&local->sta_mtx)); 208 } 209 return sta; 210 } 211 212 /* 213 * Get sta info either from the specified interface 214 * or from one of its vlans 215 */ 216 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata, 217 const u8 *addr) 218 { 219 struct ieee80211_local *local = sdata->local; 220 struct sta_info *sta; 221 222 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], 223 lockdep_is_held(&local->sta_mtx)); 224 while (sta) { 225 if ((sta->sdata == sdata || 226 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) && 227 ether_addr_equal(sta->sta.addr, addr)) 228 break; 229 sta = rcu_dereference_check(sta->hnext, 230 lockdep_is_held(&local->sta_mtx)); 231 } 232 return sta; 233 } 234 235 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, 236 int idx) 237 { 238 struct ieee80211_local *local = sdata->local; 239 struct sta_info *sta; 240 int i = 0; 241 242 list_for_each_entry_rcu(sta, &local->sta_list, list) { 243 if (sdata != sta->sdata) 244 continue; 245 if (i < idx) { 246 ++i; 247 continue; 248 } 249 return sta; 250 } 251 252 return NULL; 253 } 254 255 /** 256 * sta_info_free - free STA 257 * 258 * @local: pointer to the global information 259 * @sta: STA info to free 260 * 261 * This function must undo everything done by sta_info_alloc() 262 * that may happen before sta_info_insert(). It may only be 263 * called when sta_info_insert() has not been attempted (and 264 * if that fails, the station is freed anyway.) 265 */ 266 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta) 267 { 268 if (sta->rate_ctrl) 269 rate_control_free_sta(sta); 270 271 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr); 272 273 kfree(sta); 274 } 275 276 /* Caller must hold local->sta_mtx */ 277 static void sta_info_hash_add(struct ieee80211_local *local, 278 struct sta_info *sta) 279 { 280 lockdep_assert_held(&local->sta_mtx); 281 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)]; 282 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta); 283 } 284 285 static void sta_unblock(struct work_struct *wk) 286 { 287 struct sta_info *sta; 288 289 sta = container_of(wk, struct sta_info, drv_unblock_wk); 290 291 if (sta->dead) 292 return; 293 294 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) { 295 local_bh_disable(); 296 ieee80211_sta_ps_deliver_wakeup(sta); 297 local_bh_enable(); 298 } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) { 299 clear_sta_flag(sta, WLAN_STA_PS_DRIVER); 300 301 local_bh_disable(); 302 ieee80211_sta_ps_deliver_poll_response(sta); 303 local_bh_enable(); 304 } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) { 305 clear_sta_flag(sta, WLAN_STA_PS_DRIVER); 306 307 local_bh_disable(); 308 ieee80211_sta_ps_deliver_uapsd(sta); 309 local_bh_enable(); 310 } else 311 clear_sta_flag(sta, WLAN_STA_PS_DRIVER); 312 } 313 314 static int sta_prepare_rate_control(struct ieee80211_local *local, 315 struct sta_info *sta, gfp_t gfp) 316 { 317 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) 318 return 0; 319 320 sta->rate_ctrl = local->rate_ctrl; 321 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, 322 &sta->sta, gfp); 323 if (!sta->rate_ctrl_priv) 324 return -ENOMEM; 325 326 return 0; 327 } 328 329 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, 330 const u8 *addr, gfp_t gfp) 331 { 332 struct ieee80211_local *local = sdata->local; 333 struct sta_info *sta; 334 struct timespec uptime; 335 int i; 336 337 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp); 338 if (!sta) 339 return NULL; 340 341 spin_lock_init(&sta->lock); 342 INIT_WORK(&sta->drv_unblock_wk, sta_unblock); 343 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work); 344 mutex_init(&sta->ampdu_mlme.mtx); 345 346 memcpy(sta->sta.addr, addr, ETH_ALEN); 347 sta->local = local; 348 sta->sdata = sdata; 349 sta->last_rx = jiffies; 350 351 sta->sta_state = IEEE80211_STA_NONE; 352 353 do_posix_clock_monotonic_gettime(&uptime); 354 sta->last_connected = uptime.tv_sec; 355 ewma_init(&sta->avg_signal, 1024, 8); 356 357 if (sta_prepare_rate_control(local, sta, gfp)) { 358 kfree(sta); 359 return NULL; 360 } 361 362 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 363 /* 364 * timer_to_tid must be initialized with identity mapping 365 * to enable session_timer's data differentiation. See 366 * sta_rx_agg_session_timer_expired for usage. 367 */ 368 sta->timer_to_tid[i] = i; 369 } 370 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 371 skb_queue_head_init(&sta->ps_tx_buf[i]); 372 skb_queue_head_init(&sta->tx_filtered[i]); 373 } 374 375 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 376 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX); 377 378 sta->sta.smps_mode = IEEE80211_SMPS_OFF; 379 380 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr); 381 382 return sta; 383 } 384 385 static int sta_info_insert_check(struct sta_info *sta) 386 { 387 struct ieee80211_sub_if_data *sdata = sta->sdata; 388 389 /* 390 * Can't be a WARN_ON because it can be triggered through a race: 391 * something inserts a STA (on one CPU) without holding the RTNL 392 * and another CPU turns off the net device. 393 */ 394 if (unlikely(!ieee80211_sdata_running(sdata))) 395 return -ENETDOWN; 396 397 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) || 398 is_multicast_ether_addr(sta->sta.addr))) 399 return -EINVAL; 400 401 return 0; 402 } 403 404 static int sta_info_insert_drv_state(struct ieee80211_local *local, 405 struct ieee80211_sub_if_data *sdata, 406 struct sta_info *sta) 407 { 408 enum ieee80211_sta_state state; 409 int err = 0; 410 411 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) { 412 err = drv_sta_state(local, sdata, sta, state, state + 1); 413 if (err) 414 break; 415 } 416 417 if (!err) { 418 /* 419 * Drivers using legacy sta_add/sta_remove callbacks only 420 * get uploaded set to true after sta_add is called. 421 */ 422 if (!local->ops->sta_add) 423 sta->uploaded = true; 424 return 0; 425 } 426 427 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 428 sdata_info(sdata, 429 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n", 430 sta->sta.addr, state + 1, err); 431 err = 0; 432 } 433 434 /* unwind on error */ 435 for (; state > IEEE80211_STA_NOTEXIST; state--) 436 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1)); 437 438 return err; 439 } 440 441 /* 442 * should be called with sta_mtx locked 443 * this function replaces the mutex lock 444 * with a RCU lock 445 */ 446 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU) 447 { 448 struct ieee80211_local *local = sta->local; 449 struct ieee80211_sub_if_data *sdata = sta->sdata; 450 struct station_info sinfo; 451 int err = 0; 452 453 lockdep_assert_held(&local->sta_mtx); 454 455 /* check if STA exists already */ 456 if (sta_info_get_bss(sdata, sta->sta.addr)) { 457 err = -EEXIST; 458 goto out_err; 459 } 460 461 /* notify driver */ 462 err = sta_info_insert_drv_state(local, sdata, sta); 463 if (err) 464 goto out_err; 465 466 local->num_sta++; 467 local->sta_generation++; 468 smp_mb(); 469 470 /* make the station visible */ 471 sta_info_hash_add(local, sta); 472 473 list_add_rcu(&sta->list, &local->sta_list); 474 475 set_sta_flag(sta, WLAN_STA_INSERTED); 476 477 ieee80211_sta_debugfs_add(sta); 478 rate_control_add_sta_debugfs(sta); 479 480 memset(&sinfo, 0, sizeof(sinfo)); 481 sinfo.filled = 0; 482 sinfo.generation = local->sta_generation; 483 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL); 484 485 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr); 486 487 /* move reference to rcu-protected */ 488 rcu_read_lock(); 489 mutex_unlock(&local->sta_mtx); 490 491 if (ieee80211_vif_is_mesh(&sdata->vif)) 492 mesh_accept_plinks_update(sdata); 493 494 return 0; 495 out_err: 496 mutex_unlock(&local->sta_mtx); 497 rcu_read_lock(); 498 return err; 499 } 500 501 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU) 502 { 503 struct ieee80211_local *local = sta->local; 504 int err = 0; 505 506 might_sleep(); 507 508 err = sta_info_insert_check(sta); 509 if (err) { 510 rcu_read_lock(); 511 goto out_free; 512 } 513 514 mutex_lock(&local->sta_mtx); 515 516 err = sta_info_insert_finish(sta); 517 if (err) 518 goto out_free; 519 520 return 0; 521 out_free: 522 BUG_ON(!err); 523 sta_info_free(local, sta); 524 return err; 525 } 526 527 int sta_info_insert(struct sta_info *sta) 528 { 529 int err = sta_info_insert_rcu(sta); 530 531 rcu_read_unlock(); 532 533 return err; 534 } 535 536 static inline void __bss_tim_set(u8 *tim, u16 id) 537 { 538 /* 539 * This format has been mandated by the IEEE specifications, 540 * so this line may not be changed to use the __set_bit() format. 541 */ 542 tim[id / 8] |= (1 << (id % 8)); 543 } 544 545 static inline void __bss_tim_clear(u8 *tim, u16 id) 546 { 547 /* 548 * This format has been mandated by the IEEE specifications, 549 * so this line may not be changed to use the __clear_bit() format. 550 */ 551 tim[id / 8] &= ~(1 << (id % 8)); 552 } 553 554 static unsigned long ieee80211_tids_for_ac(int ac) 555 { 556 /* If we ever support TIDs > 7, this obviously needs to be adjusted */ 557 switch (ac) { 558 case IEEE80211_AC_VO: 559 return BIT(6) | BIT(7); 560 case IEEE80211_AC_VI: 561 return BIT(4) | BIT(5); 562 case IEEE80211_AC_BE: 563 return BIT(0) | BIT(3); 564 case IEEE80211_AC_BK: 565 return BIT(1) | BIT(2); 566 default: 567 WARN_ON(1); 568 return 0; 569 } 570 } 571 572 void sta_info_recalc_tim(struct sta_info *sta) 573 { 574 struct ieee80211_local *local = sta->local; 575 struct ps_data *ps; 576 bool indicate_tim = false; 577 u8 ignore_for_tim = sta->sta.uapsd_queues; 578 int ac; 579 u16 id; 580 581 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 582 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 583 if (WARN_ON_ONCE(!sta->sdata->bss)) 584 return; 585 586 ps = &sta->sdata->bss->ps; 587 id = sta->sta.aid; 588 #ifdef CONFIG_MAC80211_MESH 589 } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) { 590 ps = &sta->sdata->u.mesh.ps; 591 /* TIM map only for PLID <= IEEE80211_MAX_AID */ 592 id = le16_to_cpu(sta->plid) % IEEE80211_MAX_AID; 593 #endif 594 } else { 595 return; 596 } 597 598 /* No need to do anything if the driver does all */ 599 if (local->hw.flags & IEEE80211_HW_AP_LINK_PS) 600 return; 601 602 if (sta->dead) 603 goto done; 604 605 /* 606 * If all ACs are delivery-enabled then we should build 607 * the TIM bit for all ACs anyway; if only some are then 608 * we ignore those and build the TIM bit using only the 609 * non-enabled ones. 610 */ 611 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1) 612 ignore_for_tim = 0; 613 614 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 615 unsigned long tids; 616 617 if (ignore_for_tim & BIT(ac)) 618 continue; 619 620 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) || 621 !skb_queue_empty(&sta->ps_tx_buf[ac]); 622 if (indicate_tim) 623 break; 624 625 tids = ieee80211_tids_for_ac(ac); 626 627 indicate_tim |= 628 sta->driver_buffered_tids & tids; 629 } 630 631 done: 632 spin_lock_bh(&local->tim_lock); 633 634 if (indicate_tim) 635 __bss_tim_set(ps->tim, id); 636 else 637 __bss_tim_clear(ps->tim, id); 638 639 if (local->ops->set_tim) { 640 local->tim_in_locked_section = true; 641 drv_set_tim(local, &sta->sta, indicate_tim); 642 local->tim_in_locked_section = false; 643 } 644 645 spin_unlock_bh(&local->tim_lock); 646 } 647 648 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb) 649 { 650 struct ieee80211_tx_info *info; 651 int timeout; 652 653 if (!skb) 654 return false; 655 656 info = IEEE80211_SKB_CB(skb); 657 658 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ 659 timeout = (sta->listen_interval * 660 sta->sdata->vif.bss_conf.beacon_int * 661 32 / 15625) * HZ; 662 if (timeout < STA_TX_BUFFER_EXPIRE) 663 timeout = STA_TX_BUFFER_EXPIRE; 664 return time_after(jiffies, info->control.jiffies + timeout); 665 } 666 667 668 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local, 669 struct sta_info *sta, int ac) 670 { 671 unsigned long flags; 672 struct sk_buff *skb; 673 674 /* 675 * First check for frames that should expire on the filtered 676 * queue. Frames here were rejected by the driver and are on 677 * a separate queue to avoid reordering with normal PS-buffered 678 * frames. They also aren't accounted for right now in the 679 * total_ps_buffered counter. 680 */ 681 for (;;) { 682 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags); 683 skb = skb_peek(&sta->tx_filtered[ac]); 684 if (sta_info_buffer_expired(sta, skb)) 685 skb = __skb_dequeue(&sta->tx_filtered[ac]); 686 else 687 skb = NULL; 688 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags); 689 690 /* 691 * Frames are queued in order, so if this one 692 * hasn't expired yet we can stop testing. If 693 * we actually reached the end of the queue we 694 * also need to stop, of course. 695 */ 696 if (!skb) 697 break; 698 ieee80211_free_txskb(&local->hw, skb); 699 } 700 701 /* 702 * Now also check the normal PS-buffered queue, this will 703 * only find something if the filtered queue was emptied 704 * since the filtered frames are all before the normal PS 705 * buffered frames. 706 */ 707 for (;;) { 708 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags); 709 skb = skb_peek(&sta->ps_tx_buf[ac]); 710 if (sta_info_buffer_expired(sta, skb)) 711 skb = __skb_dequeue(&sta->ps_tx_buf[ac]); 712 else 713 skb = NULL; 714 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags); 715 716 /* 717 * frames are queued in order, so if this one 718 * hasn't expired yet (or we reached the end of 719 * the queue) we can stop testing 720 */ 721 if (!skb) 722 break; 723 724 local->total_ps_buffered--; 725 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n", 726 sta->sta.addr); 727 ieee80211_free_txskb(&local->hw, skb); 728 } 729 730 /* 731 * Finally, recalculate the TIM bit for this station -- it might 732 * now be clear because the station was too slow to retrieve its 733 * frames. 734 */ 735 sta_info_recalc_tim(sta); 736 737 /* 738 * Return whether there are any frames still buffered, this is 739 * used to check whether the cleanup timer still needs to run, 740 * if there are no frames we don't need to rearm the timer. 741 */ 742 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) && 743 skb_queue_empty(&sta->tx_filtered[ac])); 744 } 745 746 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local, 747 struct sta_info *sta) 748 { 749 bool have_buffered = false; 750 int ac; 751 752 /* This is only necessary for stations on BSS/MBSS interfaces */ 753 if (!sta->sdata->bss && 754 !ieee80211_vif_is_mesh(&sta->sdata->vif)) 755 return false; 756 757 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 758 have_buffered |= 759 sta_info_cleanup_expire_buffered_ac(local, sta, ac); 760 761 return have_buffered; 762 } 763 764 int __must_check __sta_info_destroy(struct sta_info *sta) 765 { 766 struct ieee80211_local *local; 767 struct ieee80211_sub_if_data *sdata; 768 int ret, i; 769 bool have_key = false; 770 771 might_sleep(); 772 773 if (!sta) 774 return -ENOENT; 775 776 local = sta->local; 777 sdata = sta->sdata; 778 779 lockdep_assert_held(&local->sta_mtx); 780 781 /* 782 * Before removing the station from the driver and 783 * rate control, it might still start new aggregation 784 * sessions -- block that to make sure the tear-down 785 * will be sufficient. 786 */ 787 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 788 ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA); 789 790 ret = sta_info_hash_del(local, sta); 791 if (ret) 792 return ret; 793 794 list_del_rcu(&sta->list); 795 796 mutex_lock(&local->key_mtx); 797 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 798 __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i])); 799 have_key = true; 800 } 801 if (sta->ptk) { 802 __ieee80211_key_free(key_mtx_dereference(local, sta->ptk)); 803 have_key = true; 804 } 805 mutex_unlock(&local->key_mtx); 806 807 if (!have_key) 808 synchronize_net(); 809 810 sta->dead = true; 811 812 local->num_sta--; 813 local->sta_generation++; 814 815 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 816 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL); 817 818 while (sta->sta_state > IEEE80211_STA_NONE) { 819 ret = sta_info_move_state(sta, sta->sta_state - 1); 820 if (ret) { 821 WARN_ON_ONCE(1); 822 break; 823 } 824 } 825 826 if (sta->uploaded) { 827 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE, 828 IEEE80211_STA_NOTEXIST); 829 WARN_ON_ONCE(ret != 0); 830 } 831 832 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr); 833 834 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL); 835 836 rate_control_remove_sta_debugfs(sta); 837 ieee80211_sta_debugfs_remove(sta); 838 839 call_rcu(&sta->rcu_head, free_sta_rcu); 840 841 return 0; 842 } 843 844 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr) 845 { 846 struct sta_info *sta; 847 int ret; 848 849 mutex_lock(&sdata->local->sta_mtx); 850 sta = sta_info_get(sdata, addr); 851 ret = __sta_info_destroy(sta); 852 mutex_unlock(&sdata->local->sta_mtx); 853 854 return ret; 855 } 856 857 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata, 858 const u8 *addr) 859 { 860 struct sta_info *sta; 861 int ret; 862 863 mutex_lock(&sdata->local->sta_mtx); 864 sta = sta_info_get_bss(sdata, addr); 865 ret = __sta_info_destroy(sta); 866 mutex_unlock(&sdata->local->sta_mtx); 867 868 return ret; 869 } 870 871 static void sta_info_cleanup(unsigned long data) 872 { 873 struct ieee80211_local *local = (struct ieee80211_local *) data; 874 struct sta_info *sta; 875 bool timer_needed = false; 876 877 rcu_read_lock(); 878 list_for_each_entry_rcu(sta, &local->sta_list, list) 879 if (sta_info_cleanup_expire_buffered(local, sta)) 880 timer_needed = true; 881 rcu_read_unlock(); 882 883 if (local->quiescing) 884 return; 885 886 if (!timer_needed) 887 return; 888 889 mod_timer(&local->sta_cleanup, 890 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL)); 891 } 892 893 void sta_info_init(struct ieee80211_local *local) 894 { 895 spin_lock_init(&local->tim_lock); 896 mutex_init(&local->sta_mtx); 897 INIT_LIST_HEAD(&local->sta_list); 898 899 setup_timer(&local->sta_cleanup, sta_info_cleanup, 900 (unsigned long)local); 901 } 902 903 void sta_info_stop(struct ieee80211_local *local) 904 { 905 del_timer_sync(&local->sta_cleanup); 906 } 907 908 909 int sta_info_flush_defer(struct ieee80211_sub_if_data *sdata) 910 { 911 struct ieee80211_local *local = sdata->local; 912 struct sta_info *sta, *tmp; 913 int ret = 0; 914 915 might_sleep(); 916 917 mutex_lock(&local->sta_mtx); 918 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 919 if (sdata == sta->sdata) { 920 WARN_ON(__sta_info_destroy(sta)); 921 ret++; 922 } 923 } 924 mutex_unlock(&local->sta_mtx); 925 926 return ret; 927 } 928 929 void sta_info_flush_cleanup(struct ieee80211_sub_if_data *sdata) 930 { 931 ieee80211_cleanup_sdata_stas(sdata); 932 cancel_work_sync(&sdata->cleanup_stations_wk); 933 } 934 935 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, 936 unsigned long exp_time) 937 { 938 struct ieee80211_local *local = sdata->local; 939 struct sta_info *sta, *tmp; 940 941 mutex_lock(&local->sta_mtx); 942 943 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 944 if (sdata != sta->sdata) 945 continue; 946 947 if (time_after(jiffies, sta->last_rx + exp_time)) { 948 sta_dbg(sta->sdata, "expiring inactive STA %pM\n", 949 sta->sta.addr); 950 951 if (ieee80211_vif_is_mesh(&sdata->vif) && 952 test_sta_flag(sta, WLAN_STA_PS_STA)) 953 atomic_dec(&sdata->u.mesh.ps.num_sta_ps); 954 955 WARN_ON(__sta_info_destroy(sta)); 956 } 957 } 958 959 mutex_unlock(&local->sta_mtx); 960 } 961 962 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw, 963 const u8 *addr, 964 const u8 *localaddr) 965 { 966 struct sta_info *sta, *nxt; 967 968 /* 969 * Just return a random station if localaddr is NULL 970 * ... first in list. 971 */ 972 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) { 973 if (localaddr && 974 !ether_addr_equal(sta->sdata->vif.addr, localaddr)) 975 continue; 976 if (!sta->uploaded) 977 return NULL; 978 return &sta->sta; 979 } 980 981 return NULL; 982 } 983 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr); 984 985 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif, 986 const u8 *addr) 987 { 988 struct sta_info *sta; 989 990 if (!vif) 991 return NULL; 992 993 sta = sta_info_get_bss(vif_to_sdata(vif), addr); 994 if (!sta) 995 return NULL; 996 997 if (!sta->uploaded) 998 return NULL; 999 1000 return &sta->sta; 1001 } 1002 EXPORT_SYMBOL(ieee80211_find_sta); 1003 1004 static void clear_sta_ps_flags(void *_sta) 1005 { 1006 struct sta_info *sta = _sta; 1007 struct ieee80211_sub_if_data *sdata = sta->sdata; 1008 struct ps_data *ps; 1009 1010 if (sdata->vif.type == NL80211_IFTYPE_AP || 1011 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1012 ps = &sdata->bss->ps; 1013 else if (ieee80211_vif_is_mesh(&sdata->vif)) 1014 ps = &sdata->u.mesh.ps; 1015 else 1016 return; 1017 1018 clear_sta_flag(sta, WLAN_STA_PS_DRIVER); 1019 if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA)) 1020 atomic_dec(&ps->num_sta_ps); 1021 } 1022 1023 /* powersave support code */ 1024 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta) 1025 { 1026 struct ieee80211_sub_if_data *sdata = sta->sdata; 1027 struct ieee80211_local *local = sdata->local; 1028 struct sk_buff_head pending; 1029 int filtered = 0, buffered = 0, ac; 1030 unsigned long flags; 1031 1032 clear_sta_flag(sta, WLAN_STA_SP); 1033 1034 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1); 1035 sta->driver_buffered_tids = 0; 1036 1037 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) 1038 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta); 1039 1040 skb_queue_head_init(&pending); 1041 1042 /* Send all buffered frames to the station */ 1043 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1044 int count = skb_queue_len(&pending), tmp; 1045 1046 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags); 1047 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending); 1048 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags); 1049 tmp = skb_queue_len(&pending); 1050 filtered += tmp - count; 1051 count = tmp; 1052 1053 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags); 1054 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending); 1055 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags); 1056 tmp = skb_queue_len(&pending); 1057 buffered += tmp - count; 1058 } 1059 1060 ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta); 1061 1062 local->total_ps_buffered -= buffered; 1063 1064 sta_info_recalc_tim(sta); 1065 1066 ps_dbg(sdata, 1067 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n", 1068 sta->sta.addr, sta->sta.aid, filtered, buffered); 1069 } 1070 1071 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata, 1072 struct sta_info *sta, int tid, 1073 enum ieee80211_frame_release_type reason) 1074 { 1075 struct ieee80211_local *local = sdata->local; 1076 struct ieee80211_qos_hdr *nullfunc; 1077 struct sk_buff *skb; 1078 int size = sizeof(*nullfunc); 1079 __le16 fc; 1080 bool qos = test_sta_flag(sta, WLAN_STA_WME); 1081 struct ieee80211_tx_info *info; 1082 struct ieee80211_chanctx_conf *chanctx_conf; 1083 1084 if (qos) { 1085 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | 1086 IEEE80211_STYPE_QOS_NULLFUNC | 1087 IEEE80211_FCTL_FROMDS); 1088 } else { 1089 size -= 2; 1090 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | 1091 IEEE80211_STYPE_NULLFUNC | 1092 IEEE80211_FCTL_FROMDS); 1093 } 1094 1095 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size); 1096 if (!skb) 1097 return; 1098 1099 skb_reserve(skb, local->hw.extra_tx_headroom); 1100 1101 nullfunc = (void *) skb_put(skb, size); 1102 nullfunc->frame_control = fc; 1103 nullfunc->duration_id = 0; 1104 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN); 1105 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 1106 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN); 1107 1108 skb->priority = tid; 1109 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]); 1110 if (qos) { 1111 nullfunc->qos_ctrl = cpu_to_le16(tid); 1112 1113 if (reason == IEEE80211_FRAME_RELEASE_UAPSD) 1114 nullfunc->qos_ctrl |= 1115 cpu_to_le16(IEEE80211_QOS_CTL_EOSP); 1116 } 1117 1118 info = IEEE80211_SKB_CB(skb); 1119 1120 /* 1121 * Tell TX path to send this frame even though the 1122 * STA may still remain is PS mode after this frame 1123 * exchange. Also set EOSP to indicate this packet 1124 * ends the poll/service period. 1125 */ 1126 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER | 1127 IEEE80211_TX_STATUS_EOSP | 1128 IEEE80211_TX_CTL_REQ_TX_STATUS; 1129 1130 drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false); 1131 1132 skb->dev = sdata->dev; 1133 1134 rcu_read_lock(); 1135 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1136 if (WARN_ON(!chanctx_conf)) { 1137 rcu_read_unlock(); 1138 kfree_skb(skb); 1139 return; 1140 } 1141 1142 ieee80211_xmit(sdata, skb, chanctx_conf->def.chan->band); 1143 rcu_read_unlock(); 1144 } 1145 1146 static void 1147 ieee80211_sta_ps_deliver_response(struct sta_info *sta, 1148 int n_frames, u8 ignored_acs, 1149 enum ieee80211_frame_release_type reason) 1150 { 1151 struct ieee80211_sub_if_data *sdata = sta->sdata; 1152 struct ieee80211_local *local = sdata->local; 1153 bool found = false; 1154 bool more_data = false; 1155 int ac; 1156 unsigned long driver_release_tids = 0; 1157 struct sk_buff_head frames; 1158 1159 /* Service or PS-Poll period starts */ 1160 set_sta_flag(sta, WLAN_STA_SP); 1161 1162 __skb_queue_head_init(&frames); 1163 1164 /* 1165 * Get response frame(s) and more data bit for it. 1166 */ 1167 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1168 unsigned long tids; 1169 1170 if (ignored_acs & BIT(ac)) 1171 continue; 1172 1173 tids = ieee80211_tids_for_ac(ac); 1174 1175 if (!found) { 1176 driver_release_tids = sta->driver_buffered_tids & tids; 1177 if (driver_release_tids) { 1178 found = true; 1179 } else { 1180 struct sk_buff *skb; 1181 1182 while (n_frames > 0) { 1183 skb = skb_dequeue(&sta->tx_filtered[ac]); 1184 if (!skb) { 1185 skb = skb_dequeue( 1186 &sta->ps_tx_buf[ac]); 1187 if (skb) 1188 local->total_ps_buffered--; 1189 } 1190 if (!skb) 1191 break; 1192 n_frames--; 1193 found = true; 1194 __skb_queue_tail(&frames, skb); 1195 } 1196 } 1197 1198 /* 1199 * If the driver has data on more than one TID then 1200 * certainly there's more data if we release just a 1201 * single frame now (from a single TID). 1202 */ 1203 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL && 1204 hweight16(driver_release_tids) > 1) { 1205 more_data = true; 1206 driver_release_tids = 1207 BIT(ffs(driver_release_tids) - 1); 1208 break; 1209 } 1210 } 1211 1212 if (!skb_queue_empty(&sta->tx_filtered[ac]) || 1213 !skb_queue_empty(&sta->ps_tx_buf[ac])) { 1214 more_data = true; 1215 break; 1216 } 1217 } 1218 1219 if (!found) { 1220 int tid; 1221 1222 /* 1223 * For PS-Poll, this can only happen due to a race condition 1224 * when we set the TIM bit and the station notices it, but 1225 * before it can poll for the frame we expire it. 1226 * 1227 * For uAPSD, this is said in the standard (11.2.1.5 h): 1228 * At each unscheduled SP for a non-AP STA, the AP shall 1229 * attempt to transmit at least one MSDU or MMPDU, but no 1230 * more than the value specified in the Max SP Length field 1231 * in the QoS Capability element from delivery-enabled ACs, 1232 * that are destined for the non-AP STA. 1233 * 1234 * Since we have no other MSDU/MMPDU, transmit a QoS null frame. 1235 */ 1236 1237 /* This will evaluate to 1, 3, 5 or 7. */ 1238 tid = 7 - ((ffs(~ignored_acs) - 1) << 1); 1239 1240 ieee80211_send_null_response(sdata, sta, tid, reason); 1241 return; 1242 } 1243 1244 if (!driver_release_tids) { 1245 struct sk_buff_head pending; 1246 struct sk_buff *skb; 1247 int num = 0; 1248 u16 tids = 0; 1249 1250 skb_queue_head_init(&pending); 1251 1252 while ((skb = __skb_dequeue(&frames))) { 1253 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1254 struct ieee80211_hdr *hdr = (void *) skb->data; 1255 u8 *qoshdr = NULL; 1256 1257 num++; 1258 1259 /* 1260 * Tell TX path to send this frame even though the 1261 * STA may still remain is PS mode after this frame 1262 * exchange. 1263 */ 1264 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 1265 1266 /* 1267 * Use MoreData flag to indicate whether there are 1268 * more buffered frames for this STA 1269 */ 1270 if (more_data || !skb_queue_empty(&frames)) 1271 hdr->frame_control |= 1272 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 1273 else 1274 hdr->frame_control &= 1275 cpu_to_le16(~IEEE80211_FCTL_MOREDATA); 1276 1277 if (ieee80211_is_data_qos(hdr->frame_control) || 1278 ieee80211_is_qos_nullfunc(hdr->frame_control)) 1279 qoshdr = ieee80211_get_qos_ctl(hdr); 1280 1281 /* end service period after last frame */ 1282 if (skb_queue_empty(&frames)) { 1283 if (reason == IEEE80211_FRAME_RELEASE_UAPSD && 1284 qoshdr) 1285 *qoshdr |= IEEE80211_QOS_CTL_EOSP; 1286 1287 info->flags |= IEEE80211_TX_STATUS_EOSP | 1288 IEEE80211_TX_CTL_REQ_TX_STATUS; 1289 } 1290 1291 if (qoshdr) 1292 tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK); 1293 else 1294 tids |= BIT(0); 1295 1296 __skb_queue_tail(&pending, skb); 1297 } 1298 1299 drv_allow_buffered_frames(local, sta, tids, num, 1300 reason, more_data); 1301 1302 ieee80211_add_pending_skbs(local, &pending); 1303 1304 sta_info_recalc_tim(sta); 1305 } else { 1306 /* 1307 * We need to release a frame that is buffered somewhere in the 1308 * driver ... it'll have to handle that. 1309 * Note that, as per the comment above, it'll also have to see 1310 * if there is more than just one frame on the specific TID that 1311 * we're releasing from, and it needs to set the more-data bit 1312 * accordingly if we tell it that there's no more data. If we do 1313 * tell it there's more data, then of course the more-data bit 1314 * needs to be set anyway. 1315 */ 1316 drv_release_buffered_frames(local, sta, driver_release_tids, 1317 n_frames, reason, more_data); 1318 1319 /* 1320 * Note that we don't recalculate the TIM bit here as it would 1321 * most likely have no effect at all unless the driver told us 1322 * that the TID became empty before returning here from the 1323 * release function. 1324 * Either way, however, when the driver tells us that the TID 1325 * became empty we'll do the TIM recalculation. 1326 */ 1327 } 1328 } 1329 1330 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta) 1331 { 1332 u8 ignore_for_response = sta->sta.uapsd_queues; 1333 1334 /* 1335 * If all ACs are delivery-enabled then we should reply 1336 * from any of them, if only some are enabled we reply 1337 * only from the non-enabled ones. 1338 */ 1339 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1) 1340 ignore_for_response = 0; 1341 1342 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response, 1343 IEEE80211_FRAME_RELEASE_PSPOLL); 1344 } 1345 1346 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta) 1347 { 1348 int n_frames = sta->sta.max_sp; 1349 u8 delivery_enabled = sta->sta.uapsd_queues; 1350 1351 /* 1352 * If we ever grow support for TSPEC this might happen if 1353 * the TSPEC update from hostapd comes in between a trigger 1354 * frame setting WLAN_STA_UAPSD in the RX path and this 1355 * actually getting called. 1356 */ 1357 if (!delivery_enabled) 1358 return; 1359 1360 switch (sta->sta.max_sp) { 1361 case 1: 1362 n_frames = 2; 1363 break; 1364 case 2: 1365 n_frames = 4; 1366 break; 1367 case 3: 1368 n_frames = 6; 1369 break; 1370 case 0: 1371 /* XXX: what is a good value? */ 1372 n_frames = 8; 1373 break; 1374 } 1375 1376 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled, 1377 IEEE80211_FRAME_RELEASE_UAPSD); 1378 } 1379 1380 void ieee80211_sta_block_awake(struct ieee80211_hw *hw, 1381 struct ieee80211_sta *pubsta, bool block) 1382 { 1383 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1384 1385 trace_api_sta_block_awake(sta->local, pubsta, block); 1386 1387 if (block) 1388 set_sta_flag(sta, WLAN_STA_PS_DRIVER); 1389 else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1390 ieee80211_queue_work(hw, &sta->drv_unblock_wk); 1391 } 1392 EXPORT_SYMBOL(ieee80211_sta_block_awake); 1393 1394 void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta) 1395 { 1396 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1397 struct ieee80211_local *local = sta->local; 1398 struct sk_buff *skb; 1399 struct skb_eosp_msg_data *data; 1400 1401 trace_api_eosp(local, pubsta); 1402 1403 skb = alloc_skb(0, GFP_ATOMIC); 1404 if (!skb) { 1405 /* too bad ... but race is better than loss */ 1406 clear_sta_flag(sta, WLAN_STA_SP); 1407 return; 1408 } 1409 1410 data = (void *)skb->cb; 1411 memcpy(data->sta, pubsta->addr, ETH_ALEN); 1412 memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN); 1413 skb->pkt_type = IEEE80211_EOSP_MSG; 1414 skb_queue_tail(&local->skb_queue, skb); 1415 tasklet_schedule(&local->tasklet); 1416 } 1417 EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe); 1418 1419 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta, 1420 u8 tid, bool buffered) 1421 { 1422 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1423 1424 if (WARN_ON(tid >= IEEE80211_NUM_TIDS)) 1425 return; 1426 1427 if (buffered) 1428 set_bit(tid, &sta->driver_buffered_tids); 1429 else 1430 clear_bit(tid, &sta->driver_buffered_tids); 1431 1432 sta_info_recalc_tim(sta); 1433 } 1434 EXPORT_SYMBOL(ieee80211_sta_set_buffered); 1435 1436 int sta_info_move_state(struct sta_info *sta, 1437 enum ieee80211_sta_state new_state) 1438 { 1439 might_sleep(); 1440 1441 if (sta->sta_state == new_state) 1442 return 0; 1443 1444 /* check allowed transitions first */ 1445 1446 switch (new_state) { 1447 case IEEE80211_STA_NONE: 1448 if (sta->sta_state != IEEE80211_STA_AUTH) 1449 return -EINVAL; 1450 break; 1451 case IEEE80211_STA_AUTH: 1452 if (sta->sta_state != IEEE80211_STA_NONE && 1453 sta->sta_state != IEEE80211_STA_ASSOC) 1454 return -EINVAL; 1455 break; 1456 case IEEE80211_STA_ASSOC: 1457 if (sta->sta_state != IEEE80211_STA_AUTH && 1458 sta->sta_state != IEEE80211_STA_AUTHORIZED) 1459 return -EINVAL; 1460 break; 1461 case IEEE80211_STA_AUTHORIZED: 1462 if (sta->sta_state != IEEE80211_STA_ASSOC) 1463 return -EINVAL; 1464 break; 1465 default: 1466 WARN(1, "invalid state %d", new_state); 1467 return -EINVAL; 1468 } 1469 1470 sta_dbg(sta->sdata, "moving STA %pM to state %d\n", 1471 sta->sta.addr, new_state); 1472 1473 /* 1474 * notify the driver before the actual changes so it can 1475 * fail the transition 1476 */ 1477 if (test_sta_flag(sta, WLAN_STA_INSERTED)) { 1478 int err = drv_sta_state(sta->local, sta->sdata, sta, 1479 sta->sta_state, new_state); 1480 if (err) 1481 return err; 1482 } 1483 1484 /* reflect the change in all state variables */ 1485 1486 switch (new_state) { 1487 case IEEE80211_STA_NONE: 1488 if (sta->sta_state == IEEE80211_STA_AUTH) 1489 clear_bit(WLAN_STA_AUTH, &sta->_flags); 1490 break; 1491 case IEEE80211_STA_AUTH: 1492 if (sta->sta_state == IEEE80211_STA_NONE) 1493 set_bit(WLAN_STA_AUTH, &sta->_flags); 1494 else if (sta->sta_state == IEEE80211_STA_ASSOC) 1495 clear_bit(WLAN_STA_ASSOC, &sta->_flags); 1496 break; 1497 case IEEE80211_STA_ASSOC: 1498 if (sta->sta_state == IEEE80211_STA_AUTH) { 1499 set_bit(WLAN_STA_ASSOC, &sta->_flags); 1500 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) { 1501 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1502 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1503 !sta->sdata->u.vlan.sta)) 1504 atomic_dec(&sta->sdata->bss->num_mcast_sta); 1505 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags); 1506 } 1507 break; 1508 case IEEE80211_STA_AUTHORIZED: 1509 if (sta->sta_state == IEEE80211_STA_ASSOC) { 1510 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1511 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1512 !sta->sdata->u.vlan.sta)) 1513 atomic_inc(&sta->sdata->bss->num_mcast_sta); 1514 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags); 1515 } 1516 break; 1517 default: 1518 break; 1519 } 1520 1521 sta->sta_state = new_state; 1522 1523 return 0; 1524 } 1525