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 free_sta_work(struct work_struct *wk) 95 { 96 struct sta_info *sta = container_of(wk, struct sta_info, free_sta_wk); 97 int ac, i; 98 struct tid_ampdu_tx *tid_tx; 99 struct ieee80211_sub_if_data *sdata = sta->sdata; 100 struct ieee80211_local *local = sdata->local; 101 struct ps_data *ps; 102 103 /* 104 * At this point, when being called as call_rcu callback, 105 * neither mac80211 nor the driver can reference this 106 * sta struct any more except by still existing timers 107 * associated with this station that we clean up below. 108 */ 109 110 if (test_sta_flag(sta, WLAN_STA_PS_STA)) { 111 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 112 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 113 ps = &sdata->bss->ps; 114 else 115 return; 116 117 clear_sta_flag(sta, WLAN_STA_PS_STA); 118 119 atomic_dec(&ps->num_sta_ps); 120 sta_info_recalc_tim(sta); 121 } 122 123 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 124 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]); 125 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]); 126 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]); 127 } 128 129 #ifdef CONFIG_MAC80211_MESH 130 if (ieee80211_vif_is_mesh(&sdata->vif)) { 131 mesh_accept_plinks_update(sdata); 132 mesh_plink_deactivate(sta); 133 del_timer_sync(&sta->plink_timer); 134 } 135 #endif 136 137 cancel_work_sync(&sta->drv_unblock_wk); 138 139 /* 140 * Destroy aggregation state here. It would be nice to wait for the 141 * driver to finish aggregation stop and then clean up, but for now 142 * drivers have to handle aggregation stop being requested, followed 143 * directly by station destruction. 144 */ 145 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 146 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]); 147 if (!tid_tx) 148 continue; 149 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending); 150 kfree(tid_tx); 151 } 152 153 sta_info_free(local, sta); 154 } 155 156 static void free_sta_rcu(struct rcu_head *h) 157 { 158 struct sta_info *sta = container_of(h, struct sta_info, rcu_head); 159 160 ieee80211_queue_work(&sta->local->hw, &sta->free_sta_wk); 161 } 162 163 /* protected by RCU */ 164 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata, 165 const u8 *addr) 166 { 167 struct ieee80211_local *local = sdata->local; 168 struct sta_info *sta; 169 170 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], 171 lockdep_is_held(&local->sta_mtx)); 172 while (sta) { 173 if (sta->sdata == sdata && 174 ether_addr_equal(sta->sta.addr, addr)) 175 break; 176 sta = rcu_dereference_check(sta->hnext, 177 lockdep_is_held(&local->sta_mtx)); 178 } 179 return sta; 180 } 181 182 /* 183 * Get sta info either from the specified interface 184 * or from one of its vlans 185 */ 186 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata, 187 const u8 *addr) 188 { 189 struct ieee80211_local *local = sdata->local; 190 struct sta_info *sta; 191 192 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], 193 lockdep_is_held(&local->sta_mtx)); 194 while (sta) { 195 if ((sta->sdata == sdata || 196 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) && 197 ether_addr_equal(sta->sta.addr, addr)) 198 break; 199 sta = rcu_dereference_check(sta->hnext, 200 lockdep_is_held(&local->sta_mtx)); 201 } 202 return sta; 203 } 204 205 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, 206 int idx) 207 { 208 struct ieee80211_local *local = sdata->local; 209 struct sta_info *sta; 210 int i = 0; 211 212 list_for_each_entry_rcu(sta, &local->sta_list, list) { 213 if (sdata != sta->sdata) 214 continue; 215 if (i < idx) { 216 ++i; 217 continue; 218 } 219 return sta; 220 } 221 222 return NULL; 223 } 224 225 /** 226 * sta_info_free - free STA 227 * 228 * @local: pointer to the global information 229 * @sta: STA info to free 230 * 231 * This function must undo everything done by sta_info_alloc() 232 * that may happen before sta_info_insert(). It may only be 233 * called when sta_info_insert() has not been attempted (and 234 * if that fails, the station is freed anyway.) 235 */ 236 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta) 237 { 238 if (sta->rate_ctrl) 239 rate_control_free_sta(sta); 240 241 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr); 242 243 kfree(sta); 244 } 245 246 /* Caller must hold local->sta_mtx */ 247 static void sta_info_hash_add(struct ieee80211_local *local, 248 struct sta_info *sta) 249 { 250 lockdep_assert_held(&local->sta_mtx); 251 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)]; 252 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta); 253 } 254 255 static void sta_unblock(struct work_struct *wk) 256 { 257 struct sta_info *sta; 258 259 sta = container_of(wk, struct sta_info, drv_unblock_wk); 260 261 if (sta->dead) 262 return; 263 264 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) { 265 local_bh_disable(); 266 ieee80211_sta_ps_deliver_wakeup(sta); 267 local_bh_enable(); 268 } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) { 269 clear_sta_flag(sta, WLAN_STA_PS_DRIVER); 270 271 local_bh_disable(); 272 ieee80211_sta_ps_deliver_poll_response(sta); 273 local_bh_enable(); 274 } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) { 275 clear_sta_flag(sta, WLAN_STA_PS_DRIVER); 276 277 local_bh_disable(); 278 ieee80211_sta_ps_deliver_uapsd(sta); 279 local_bh_enable(); 280 } else 281 clear_sta_flag(sta, WLAN_STA_PS_DRIVER); 282 } 283 284 static int sta_prepare_rate_control(struct ieee80211_local *local, 285 struct sta_info *sta, gfp_t gfp) 286 { 287 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) 288 return 0; 289 290 sta->rate_ctrl = local->rate_ctrl; 291 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, 292 &sta->sta, gfp); 293 if (!sta->rate_ctrl_priv) 294 return -ENOMEM; 295 296 return 0; 297 } 298 299 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, 300 const u8 *addr, gfp_t gfp) 301 { 302 struct ieee80211_local *local = sdata->local; 303 struct sta_info *sta; 304 struct timespec uptime; 305 int i; 306 307 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp); 308 if (!sta) 309 return NULL; 310 311 spin_lock_init(&sta->lock); 312 INIT_WORK(&sta->drv_unblock_wk, sta_unblock); 313 INIT_WORK(&sta->free_sta_wk, free_sta_work); 314 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work); 315 mutex_init(&sta->ampdu_mlme.mtx); 316 317 memcpy(sta->sta.addr, addr, ETH_ALEN); 318 sta->local = local; 319 sta->sdata = sdata; 320 sta->last_rx = jiffies; 321 322 sta->sta_state = IEEE80211_STA_NONE; 323 324 do_posix_clock_monotonic_gettime(&uptime); 325 sta->last_connected = uptime.tv_sec; 326 ewma_init(&sta->avg_signal, 1024, 8); 327 328 if (sta_prepare_rate_control(local, sta, gfp)) { 329 kfree(sta); 330 return NULL; 331 } 332 333 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 334 /* 335 * timer_to_tid must be initialized with identity mapping 336 * to enable session_timer's data differentiation. See 337 * sta_rx_agg_session_timer_expired for usage. 338 */ 339 sta->timer_to_tid[i] = i; 340 } 341 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 342 skb_queue_head_init(&sta->ps_tx_buf[i]); 343 skb_queue_head_init(&sta->tx_filtered[i]); 344 } 345 346 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 347 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX); 348 349 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr); 350 351 #ifdef CONFIG_MAC80211_MESH 352 sta->plink_state = NL80211_PLINK_LISTEN; 353 init_timer(&sta->plink_timer); 354 #endif 355 356 return sta; 357 } 358 359 static int sta_info_insert_check(struct sta_info *sta) 360 { 361 struct ieee80211_sub_if_data *sdata = sta->sdata; 362 363 /* 364 * Can't be a WARN_ON because it can be triggered through a race: 365 * something inserts a STA (on one CPU) without holding the RTNL 366 * and another CPU turns off the net device. 367 */ 368 if (unlikely(!ieee80211_sdata_running(sdata))) 369 return -ENETDOWN; 370 371 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) || 372 is_multicast_ether_addr(sta->sta.addr))) 373 return -EINVAL; 374 375 return 0; 376 } 377 378 static int sta_info_insert_drv_state(struct ieee80211_local *local, 379 struct ieee80211_sub_if_data *sdata, 380 struct sta_info *sta) 381 { 382 enum ieee80211_sta_state state; 383 int err = 0; 384 385 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) { 386 err = drv_sta_state(local, sdata, sta, state, state + 1); 387 if (err) 388 break; 389 } 390 391 if (!err) { 392 /* 393 * Drivers using legacy sta_add/sta_remove callbacks only 394 * get uploaded set to true after sta_add is called. 395 */ 396 if (!local->ops->sta_add) 397 sta->uploaded = true; 398 return 0; 399 } 400 401 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 402 sdata_info(sdata, 403 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n", 404 sta->sta.addr, state + 1, err); 405 err = 0; 406 } 407 408 /* unwind on error */ 409 for (; state > IEEE80211_STA_NOTEXIST; state--) 410 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1)); 411 412 return err; 413 } 414 415 /* 416 * should be called with sta_mtx locked 417 * this function replaces the mutex lock 418 * with a RCU lock 419 */ 420 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU) 421 { 422 struct ieee80211_local *local = sta->local; 423 struct ieee80211_sub_if_data *sdata = sta->sdata; 424 struct station_info sinfo; 425 int err = 0; 426 427 lockdep_assert_held(&local->sta_mtx); 428 429 /* check if STA exists already */ 430 if (sta_info_get_bss(sdata, sta->sta.addr)) { 431 err = -EEXIST; 432 goto out_err; 433 } 434 435 /* notify driver */ 436 err = sta_info_insert_drv_state(local, sdata, sta); 437 if (err) 438 goto out_err; 439 440 local->num_sta++; 441 local->sta_generation++; 442 smp_mb(); 443 444 /* make the station visible */ 445 sta_info_hash_add(local, sta); 446 447 list_add_rcu(&sta->list, &local->sta_list); 448 449 set_sta_flag(sta, WLAN_STA_INSERTED); 450 451 ieee80211_sta_debugfs_add(sta); 452 rate_control_add_sta_debugfs(sta); 453 454 memset(&sinfo, 0, sizeof(sinfo)); 455 sinfo.filled = 0; 456 sinfo.generation = local->sta_generation; 457 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL); 458 459 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr); 460 461 /* move reference to rcu-protected */ 462 rcu_read_lock(); 463 mutex_unlock(&local->sta_mtx); 464 465 if (ieee80211_vif_is_mesh(&sdata->vif)) 466 mesh_accept_plinks_update(sdata); 467 468 return 0; 469 out_err: 470 mutex_unlock(&local->sta_mtx); 471 rcu_read_lock(); 472 return err; 473 } 474 475 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU) 476 { 477 struct ieee80211_local *local = sta->local; 478 int err = 0; 479 480 might_sleep(); 481 482 err = sta_info_insert_check(sta); 483 if (err) { 484 rcu_read_lock(); 485 goto out_free; 486 } 487 488 mutex_lock(&local->sta_mtx); 489 490 err = sta_info_insert_finish(sta); 491 if (err) 492 goto out_free; 493 494 return 0; 495 out_free: 496 BUG_ON(!err); 497 sta_info_free(local, sta); 498 return err; 499 } 500 501 int sta_info_insert(struct sta_info *sta) 502 { 503 int err = sta_info_insert_rcu(sta); 504 505 rcu_read_unlock(); 506 507 return err; 508 } 509 510 static inline void __bss_tim_set(u8 *tim, u16 id) 511 { 512 /* 513 * This format has been mandated by the IEEE specifications, 514 * so this line may not be changed to use the __set_bit() format. 515 */ 516 tim[id / 8] |= (1 << (id % 8)); 517 } 518 519 static inline void __bss_tim_clear(u8 *tim, u16 id) 520 { 521 /* 522 * This format has been mandated by the IEEE specifications, 523 * so this line may not be changed to use the __clear_bit() format. 524 */ 525 tim[id / 8] &= ~(1 << (id % 8)); 526 } 527 528 static unsigned long ieee80211_tids_for_ac(int ac) 529 { 530 /* If we ever support TIDs > 7, this obviously needs to be adjusted */ 531 switch (ac) { 532 case IEEE80211_AC_VO: 533 return BIT(6) | BIT(7); 534 case IEEE80211_AC_VI: 535 return BIT(4) | BIT(5); 536 case IEEE80211_AC_BE: 537 return BIT(0) | BIT(3); 538 case IEEE80211_AC_BK: 539 return BIT(1) | BIT(2); 540 default: 541 WARN_ON(1); 542 return 0; 543 } 544 } 545 546 void sta_info_recalc_tim(struct sta_info *sta) 547 { 548 struct ieee80211_local *local = sta->local; 549 struct ps_data *ps; 550 unsigned long flags; 551 bool indicate_tim = false; 552 u8 ignore_for_tim = sta->sta.uapsd_queues; 553 int ac; 554 u16 id; 555 556 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 557 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 558 if (WARN_ON_ONCE(!sta->sdata->bss)) 559 return; 560 561 ps = &sta->sdata->bss->ps; 562 id = sta->sta.aid; 563 } else { 564 return; 565 } 566 567 /* No need to do anything if the driver does all */ 568 if (local->hw.flags & IEEE80211_HW_AP_LINK_PS) 569 return; 570 571 if (sta->dead) 572 goto done; 573 574 /* 575 * If all ACs are delivery-enabled then we should build 576 * the TIM bit for all ACs anyway; if only some are then 577 * we ignore those and build the TIM bit using only the 578 * non-enabled ones. 579 */ 580 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1) 581 ignore_for_tim = 0; 582 583 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 584 unsigned long tids; 585 586 if (ignore_for_tim & BIT(ac)) 587 continue; 588 589 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) || 590 !skb_queue_empty(&sta->ps_tx_buf[ac]); 591 if (indicate_tim) 592 break; 593 594 tids = ieee80211_tids_for_ac(ac); 595 596 indicate_tim |= 597 sta->driver_buffered_tids & tids; 598 } 599 600 done: 601 spin_lock_irqsave(&local->tim_lock, flags); 602 603 if (indicate_tim) 604 __bss_tim_set(ps->tim, id); 605 else 606 __bss_tim_clear(ps->tim, id); 607 608 if (local->ops->set_tim) { 609 local->tim_in_locked_section = true; 610 drv_set_tim(local, &sta->sta, indicate_tim); 611 local->tim_in_locked_section = false; 612 } 613 614 spin_unlock_irqrestore(&local->tim_lock, flags); 615 } 616 617 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb) 618 { 619 struct ieee80211_tx_info *info; 620 int timeout; 621 622 if (!skb) 623 return false; 624 625 info = IEEE80211_SKB_CB(skb); 626 627 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ 628 timeout = (sta->listen_interval * 629 sta->sdata->vif.bss_conf.beacon_int * 630 32 / 15625) * HZ; 631 if (timeout < STA_TX_BUFFER_EXPIRE) 632 timeout = STA_TX_BUFFER_EXPIRE; 633 return time_after(jiffies, info->control.jiffies + timeout); 634 } 635 636 637 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local, 638 struct sta_info *sta, int ac) 639 { 640 unsigned long flags; 641 struct sk_buff *skb; 642 643 /* 644 * First check for frames that should expire on the filtered 645 * queue. Frames here were rejected by the driver and are on 646 * a separate queue to avoid reordering with normal PS-buffered 647 * frames. They also aren't accounted for right now in the 648 * total_ps_buffered counter. 649 */ 650 for (;;) { 651 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags); 652 skb = skb_peek(&sta->tx_filtered[ac]); 653 if (sta_info_buffer_expired(sta, skb)) 654 skb = __skb_dequeue(&sta->tx_filtered[ac]); 655 else 656 skb = NULL; 657 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags); 658 659 /* 660 * Frames are queued in order, so if this one 661 * hasn't expired yet we can stop testing. If 662 * we actually reached the end of the queue we 663 * also need to stop, of course. 664 */ 665 if (!skb) 666 break; 667 ieee80211_free_txskb(&local->hw, skb); 668 } 669 670 /* 671 * Now also check the normal PS-buffered queue, this will 672 * only find something if the filtered queue was emptied 673 * since the filtered frames are all before the normal PS 674 * buffered frames. 675 */ 676 for (;;) { 677 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags); 678 skb = skb_peek(&sta->ps_tx_buf[ac]); 679 if (sta_info_buffer_expired(sta, skb)) 680 skb = __skb_dequeue(&sta->ps_tx_buf[ac]); 681 else 682 skb = NULL; 683 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags); 684 685 /* 686 * frames are queued in order, so if this one 687 * hasn't expired yet (or we reached the end of 688 * the queue) we can stop testing 689 */ 690 if (!skb) 691 break; 692 693 local->total_ps_buffered--; 694 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n", 695 sta->sta.addr); 696 ieee80211_free_txskb(&local->hw, skb); 697 } 698 699 /* 700 * Finally, recalculate the TIM bit for this station -- it might 701 * now be clear because the station was too slow to retrieve its 702 * frames. 703 */ 704 sta_info_recalc_tim(sta); 705 706 /* 707 * Return whether there are any frames still buffered, this is 708 * used to check whether the cleanup timer still needs to run, 709 * if there are no frames we don't need to rearm the timer. 710 */ 711 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) && 712 skb_queue_empty(&sta->tx_filtered[ac])); 713 } 714 715 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local, 716 struct sta_info *sta) 717 { 718 bool have_buffered = false; 719 int ac; 720 721 /* This is only necessary for stations on BSS interfaces */ 722 if (!sta->sdata->bss) 723 return false; 724 725 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 726 have_buffered |= 727 sta_info_cleanup_expire_buffered_ac(local, sta, ac); 728 729 return have_buffered; 730 } 731 732 int __must_check __sta_info_destroy(struct sta_info *sta) 733 { 734 struct ieee80211_local *local; 735 struct ieee80211_sub_if_data *sdata; 736 int ret, i; 737 738 might_sleep(); 739 740 if (!sta) 741 return -ENOENT; 742 743 local = sta->local; 744 sdata = sta->sdata; 745 746 lockdep_assert_held(&local->sta_mtx); 747 748 /* 749 * Before removing the station from the driver and 750 * rate control, it might still start new aggregation 751 * sessions -- block that to make sure the tear-down 752 * will be sufficient. 753 */ 754 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 755 ieee80211_sta_tear_down_BA_sessions(sta, false); 756 757 ret = sta_info_hash_del(local, sta); 758 if (ret) 759 return ret; 760 761 list_del_rcu(&sta->list); 762 763 mutex_lock(&local->key_mtx); 764 for (i = 0; i < NUM_DEFAULT_KEYS; i++) 765 __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i])); 766 if (sta->ptk) 767 __ieee80211_key_free(key_mtx_dereference(local, sta->ptk)); 768 mutex_unlock(&local->key_mtx); 769 770 sta->dead = true; 771 772 local->num_sta--; 773 local->sta_generation++; 774 775 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 776 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL); 777 778 while (sta->sta_state > IEEE80211_STA_NONE) { 779 ret = sta_info_move_state(sta, sta->sta_state - 1); 780 if (ret) { 781 WARN_ON_ONCE(1); 782 break; 783 } 784 } 785 786 if (sta->uploaded) { 787 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE, 788 IEEE80211_STA_NOTEXIST); 789 WARN_ON_ONCE(ret != 0); 790 } 791 792 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr); 793 794 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL); 795 796 rate_control_remove_sta_debugfs(sta); 797 ieee80211_sta_debugfs_remove(sta); 798 799 call_rcu(&sta->rcu_head, free_sta_rcu); 800 801 return 0; 802 } 803 804 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr) 805 { 806 struct sta_info *sta; 807 int ret; 808 809 mutex_lock(&sdata->local->sta_mtx); 810 sta = sta_info_get(sdata, addr); 811 ret = __sta_info_destroy(sta); 812 mutex_unlock(&sdata->local->sta_mtx); 813 814 return ret; 815 } 816 817 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata, 818 const u8 *addr) 819 { 820 struct sta_info *sta; 821 int ret; 822 823 mutex_lock(&sdata->local->sta_mtx); 824 sta = sta_info_get_bss(sdata, addr); 825 ret = __sta_info_destroy(sta); 826 mutex_unlock(&sdata->local->sta_mtx); 827 828 return ret; 829 } 830 831 static void sta_info_cleanup(unsigned long data) 832 { 833 struct ieee80211_local *local = (struct ieee80211_local *) data; 834 struct sta_info *sta; 835 bool timer_needed = false; 836 837 rcu_read_lock(); 838 list_for_each_entry_rcu(sta, &local->sta_list, list) 839 if (sta_info_cleanup_expire_buffered(local, sta)) 840 timer_needed = true; 841 rcu_read_unlock(); 842 843 if (local->quiescing) 844 return; 845 846 if (!timer_needed) 847 return; 848 849 mod_timer(&local->sta_cleanup, 850 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL)); 851 } 852 853 void sta_info_init(struct ieee80211_local *local) 854 { 855 spin_lock_init(&local->tim_lock); 856 mutex_init(&local->sta_mtx); 857 INIT_LIST_HEAD(&local->sta_list); 858 859 setup_timer(&local->sta_cleanup, sta_info_cleanup, 860 (unsigned long)local); 861 } 862 863 void sta_info_stop(struct ieee80211_local *local) 864 { 865 del_timer(&local->sta_cleanup); 866 sta_info_flush(local, NULL); 867 } 868 869 /** 870 * sta_info_flush - flush matching STA entries from the STA table 871 * 872 * Returns the number of removed STA entries. 873 * 874 * @local: local interface data 875 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs 876 */ 877 int sta_info_flush(struct ieee80211_local *local, 878 struct ieee80211_sub_if_data *sdata) 879 { 880 struct sta_info *sta, *tmp; 881 int ret = 0; 882 883 might_sleep(); 884 885 mutex_lock(&local->sta_mtx); 886 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 887 if (!sdata || sdata == sta->sdata) { 888 WARN_ON(__sta_info_destroy(sta)); 889 ret++; 890 } 891 } 892 mutex_unlock(&local->sta_mtx); 893 894 return ret; 895 } 896 897 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, 898 unsigned long exp_time) 899 { 900 struct ieee80211_local *local = sdata->local; 901 struct sta_info *sta, *tmp; 902 903 mutex_lock(&local->sta_mtx); 904 905 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 906 if (sdata != sta->sdata) 907 continue; 908 909 if (time_after(jiffies, sta->last_rx + exp_time)) { 910 sta_dbg(sta->sdata, "expiring inactive STA %pM\n", 911 sta->sta.addr); 912 WARN_ON(__sta_info_destroy(sta)); 913 } 914 } 915 916 mutex_unlock(&local->sta_mtx); 917 } 918 919 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw, 920 const u8 *addr, 921 const u8 *localaddr) 922 { 923 struct sta_info *sta, *nxt; 924 925 /* 926 * Just return a random station if localaddr is NULL 927 * ... first in list. 928 */ 929 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) { 930 if (localaddr && 931 !ether_addr_equal(sta->sdata->vif.addr, localaddr)) 932 continue; 933 if (!sta->uploaded) 934 return NULL; 935 return &sta->sta; 936 } 937 938 return NULL; 939 } 940 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr); 941 942 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif, 943 const u8 *addr) 944 { 945 struct sta_info *sta; 946 947 if (!vif) 948 return NULL; 949 950 sta = sta_info_get_bss(vif_to_sdata(vif), addr); 951 if (!sta) 952 return NULL; 953 954 if (!sta->uploaded) 955 return NULL; 956 957 return &sta->sta; 958 } 959 EXPORT_SYMBOL(ieee80211_find_sta); 960 961 static void clear_sta_ps_flags(void *_sta) 962 { 963 struct sta_info *sta = _sta; 964 struct ieee80211_sub_if_data *sdata = sta->sdata; 965 struct ps_data *ps; 966 967 if (sdata->vif.type == NL80211_IFTYPE_AP || 968 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 969 ps = &sdata->bss->ps; 970 else 971 return; 972 973 clear_sta_flag(sta, WLAN_STA_PS_DRIVER); 974 if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA)) 975 atomic_dec(&ps->num_sta_ps); 976 } 977 978 /* powersave support code */ 979 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta) 980 { 981 struct ieee80211_sub_if_data *sdata = sta->sdata; 982 struct ieee80211_local *local = sdata->local; 983 struct sk_buff_head pending; 984 int filtered = 0, buffered = 0, ac; 985 unsigned long flags; 986 987 clear_sta_flag(sta, WLAN_STA_SP); 988 989 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1); 990 sta->driver_buffered_tids = 0; 991 992 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) 993 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta); 994 995 skb_queue_head_init(&pending); 996 997 /* Send all buffered frames to the station */ 998 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 999 int count = skb_queue_len(&pending), tmp; 1000 1001 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags); 1002 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending); 1003 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags); 1004 tmp = skb_queue_len(&pending); 1005 filtered += tmp - count; 1006 count = tmp; 1007 1008 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags); 1009 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending); 1010 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags); 1011 tmp = skb_queue_len(&pending); 1012 buffered += tmp - count; 1013 } 1014 1015 ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta); 1016 1017 local->total_ps_buffered -= buffered; 1018 1019 sta_info_recalc_tim(sta); 1020 1021 ps_dbg(sdata, 1022 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n", 1023 sta->sta.addr, sta->sta.aid, filtered, buffered); 1024 } 1025 1026 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata, 1027 struct sta_info *sta, int tid, 1028 enum ieee80211_frame_release_type reason) 1029 { 1030 struct ieee80211_local *local = sdata->local; 1031 struct ieee80211_qos_hdr *nullfunc; 1032 struct sk_buff *skb; 1033 int size = sizeof(*nullfunc); 1034 __le16 fc; 1035 bool qos = test_sta_flag(sta, WLAN_STA_WME); 1036 struct ieee80211_tx_info *info; 1037 struct ieee80211_chanctx_conf *chanctx_conf; 1038 1039 if (qos) { 1040 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | 1041 IEEE80211_STYPE_QOS_NULLFUNC | 1042 IEEE80211_FCTL_FROMDS); 1043 } else { 1044 size -= 2; 1045 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | 1046 IEEE80211_STYPE_NULLFUNC | 1047 IEEE80211_FCTL_FROMDS); 1048 } 1049 1050 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size); 1051 if (!skb) 1052 return; 1053 1054 skb_reserve(skb, local->hw.extra_tx_headroom); 1055 1056 nullfunc = (void *) skb_put(skb, size); 1057 nullfunc->frame_control = fc; 1058 nullfunc->duration_id = 0; 1059 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN); 1060 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 1061 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN); 1062 1063 skb->priority = tid; 1064 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]); 1065 if (qos) { 1066 nullfunc->qos_ctrl = cpu_to_le16(tid); 1067 1068 if (reason == IEEE80211_FRAME_RELEASE_UAPSD) 1069 nullfunc->qos_ctrl |= 1070 cpu_to_le16(IEEE80211_QOS_CTL_EOSP); 1071 } 1072 1073 info = IEEE80211_SKB_CB(skb); 1074 1075 /* 1076 * Tell TX path to send this frame even though the 1077 * STA may still remain is PS mode after this frame 1078 * exchange. Also set EOSP to indicate this packet 1079 * ends the poll/service period. 1080 */ 1081 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER | 1082 IEEE80211_TX_STATUS_EOSP | 1083 IEEE80211_TX_CTL_REQ_TX_STATUS; 1084 1085 drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false); 1086 1087 rcu_read_lock(); 1088 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1089 if (WARN_ON(!chanctx_conf)) { 1090 rcu_read_unlock(); 1091 kfree_skb(skb); 1092 return; 1093 } 1094 1095 ieee80211_xmit(sdata, skb, chanctx_conf->def.chan->band); 1096 rcu_read_unlock(); 1097 } 1098 1099 static void 1100 ieee80211_sta_ps_deliver_response(struct sta_info *sta, 1101 int n_frames, u8 ignored_acs, 1102 enum ieee80211_frame_release_type reason) 1103 { 1104 struct ieee80211_sub_if_data *sdata = sta->sdata; 1105 struct ieee80211_local *local = sdata->local; 1106 bool found = false; 1107 bool more_data = false; 1108 int ac; 1109 unsigned long driver_release_tids = 0; 1110 struct sk_buff_head frames; 1111 1112 /* Service or PS-Poll period starts */ 1113 set_sta_flag(sta, WLAN_STA_SP); 1114 1115 __skb_queue_head_init(&frames); 1116 1117 /* 1118 * Get response frame(s) and more data bit for it. 1119 */ 1120 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1121 unsigned long tids; 1122 1123 if (ignored_acs & BIT(ac)) 1124 continue; 1125 1126 tids = ieee80211_tids_for_ac(ac); 1127 1128 if (!found) { 1129 driver_release_tids = sta->driver_buffered_tids & tids; 1130 if (driver_release_tids) { 1131 found = true; 1132 } else { 1133 struct sk_buff *skb; 1134 1135 while (n_frames > 0) { 1136 skb = skb_dequeue(&sta->tx_filtered[ac]); 1137 if (!skb) { 1138 skb = skb_dequeue( 1139 &sta->ps_tx_buf[ac]); 1140 if (skb) 1141 local->total_ps_buffered--; 1142 } 1143 if (!skb) 1144 break; 1145 n_frames--; 1146 found = true; 1147 __skb_queue_tail(&frames, skb); 1148 } 1149 } 1150 1151 /* 1152 * If the driver has data on more than one TID then 1153 * certainly there's more data if we release just a 1154 * single frame now (from a single TID). 1155 */ 1156 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL && 1157 hweight16(driver_release_tids) > 1) { 1158 more_data = true; 1159 driver_release_tids = 1160 BIT(ffs(driver_release_tids) - 1); 1161 break; 1162 } 1163 } 1164 1165 if (!skb_queue_empty(&sta->tx_filtered[ac]) || 1166 !skb_queue_empty(&sta->ps_tx_buf[ac])) { 1167 more_data = true; 1168 break; 1169 } 1170 } 1171 1172 if (!found) { 1173 int tid; 1174 1175 /* 1176 * For PS-Poll, this can only happen due to a race condition 1177 * when we set the TIM bit and the station notices it, but 1178 * before it can poll for the frame we expire it. 1179 * 1180 * For uAPSD, this is said in the standard (11.2.1.5 h): 1181 * At each unscheduled SP for a non-AP STA, the AP shall 1182 * attempt to transmit at least one MSDU or MMPDU, but no 1183 * more than the value specified in the Max SP Length field 1184 * in the QoS Capability element from delivery-enabled ACs, 1185 * that are destined for the non-AP STA. 1186 * 1187 * Since we have no other MSDU/MMPDU, transmit a QoS null frame. 1188 */ 1189 1190 /* This will evaluate to 1, 3, 5 or 7. */ 1191 tid = 7 - ((ffs(~ignored_acs) - 1) << 1); 1192 1193 ieee80211_send_null_response(sdata, sta, tid, reason); 1194 return; 1195 } 1196 1197 if (!driver_release_tids) { 1198 struct sk_buff_head pending; 1199 struct sk_buff *skb; 1200 int num = 0; 1201 u16 tids = 0; 1202 1203 skb_queue_head_init(&pending); 1204 1205 while ((skb = __skb_dequeue(&frames))) { 1206 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1207 struct ieee80211_hdr *hdr = (void *) skb->data; 1208 u8 *qoshdr = NULL; 1209 1210 num++; 1211 1212 /* 1213 * Tell TX path to send this frame even though the 1214 * STA may still remain is PS mode after this frame 1215 * exchange. 1216 */ 1217 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 1218 1219 /* 1220 * Use MoreData flag to indicate whether there are 1221 * more buffered frames for this STA 1222 */ 1223 if (more_data || !skb_queue_empty(&frames)) 1224 hdr->frame_control |= 1225 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 1226 else 1227 hdr->frame_control &= 1228 cpu_to_le16(~IEEE80211_FCTL_MOREDATA); 1229 1230 if (ieee80211_is_data_qos(hdr->frame_control) || 1231 ieee80211_is_qos_nullfunc(hdr->frame_control)) 1232 qoshdr = ieee80211_get_qos_ctl(hdr); 1233 1234 /* end service period after last frame */ 1235 if (skb_queue_empty(&frames)) { 1236 if (reason == IEEE80211_FRAME_RELEASE_UAPSD && 1237 qoshdr) 1238 *qoshdr |= IEEE80211_QOS_CTL_EOSP; 1239 1240 info->flags |= IEEE80211_TX_STATUS_EOSP | 1241 IEEE80211_TX_CTL_REQ_TX_STATUS; 1242 } 1243 1244 if (qoshdr) 1245 tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK); 1246 else 1247 tids |= BIT(0); 1248 1249 __skb_queue_tail(&pending, skb); 1250 } 1251 1252 drv_allow_buffered_frames(local, sta, tids, num, 1253 reason, more_data); 1254 1255 ieee80211_add_pending_skbs(local, &pending); 1256 1257 sta_info_recalc_tim(sta); 1258 } else { 1259 /* 1260 * We need to release a frame that is buffered somewhere in the 1261 * driver ... it'll have to handle that. 1262 * Note that, as per the comment above, it'll also have to see 1263 * if there is more than just one frame on the specific TID that 1264 * we're releasing from, and it needs to set the more-data bit 1265 * accordingly if we tell it that there's no more data. If we do 1266 * tell it there's more data, then of course the more-data bit 1267 * needs to be set anyway. 1268 */ 1269 drv_release_buffered_frames(local, sta, driver_release_tids, 1270 n_frames, reason, more_data); 1271 1272 /* 1273 * Note that we don't recalculate the TIM bit here as it would 1274 * most likely have no effect at all unless the driver told us 1275 * that the TID became empty before returning here from the 1276 * release function. 1277 * Either way, however, when the driver tells us that the TID 1278 * became empty we'll do the TIM recalculation. 1279 */ 1280 } 1281 } 1282 1283 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta) 1284 { 1285 u8 ignore_for_response = sta->sta.uapsd_queues; 1286 1287 /* 1288 * If all ACs are delivery-enabled then we should reply 1289 * from any of them, if only some are enabled we reply 1290 * only from the non-enabled ones. 1291 */ 1292 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1) 1293 ignore_for_response = 0; 1294 1295 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response, 1296 IEEE80211_FRAME_RELEASE_PSPOLL); 1297 } 1298 1299 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta) 1300 { 1301 int n_frames = sta->sta.max_sp; 1302 u8 delivery_enabled = sta->sta.uapsd_queues; 1303 1304 /* 1305 * If we ever grow support for TSPEC this might happen if 1306 * the TSPEC update from hostapd comes in between a trigger 1307 * frame setting WLAN_STA_UAPSD in the RX path and this 1308 * actually getting called. 1309 */ 1310 if (!delivery_enabled) 1311 return; 1312 1313 switch (sta->sta.max_sp) { 1314 case 1: 1315 n_frames = 2; 1316 break; 1317 case 2: 1318 n_frames = 4; 1319 break; 1320 case 3: 1321 n_frames = 6; 1322 break; 1323 case 0: 1324 /* XXX: what is a good value? */ 1325 n_frames = 8; 1326 break; 1327 } 1328 1329 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled, 1330 IEEE80211_FRAME_RELEASE_UAPSD); 1331 } 1332 1333 void ieee80211_sta_block_awake(struct ieee80211_hw *hw, 1334 struct ieee80211_sta *pubsta, bool block) 1335 { 1336 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1337 1338 trace_api_sta_block_awake(sta->local, pubsta, block); 1339 1340 if (block) 1341 set_sta_flag(sta, WLAN_STA_PS_DRIVER); 1342 else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) 1343 ieee80211_queue_work(hw, &sta->drv_unblock_wk); 1344 } 1345 EXPORT_SYMBOL(ieee80211_sta_block_awake); 1346 1347 void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta) 1348 { 1349 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1350 struct ieee80211_local *local = sta->local; 1351 struct sk_buff *skb; 1352 struct skb_eosp_msg_data *data; 1353 1354 trace_api_eosp(local, pubsta); 1355 1356 skb = alloc_skb(0, GFP_ATOMIC); 1357 if (!skb) { 1358 /* too bad ... but race is better than loss */ 1359 clear_sta_flag(sta, WLAN_STA_SP); 1360 return; 1361 } 1362 1363 data = (void *)skb->cb; 1364 memcpy(data->sta, pubsta->addr, ETH_ALEN); 1365 memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN); 1366 skb->pkt_type = IEEE80211_EOSP_MSG; 1367 skb_queue_tail(&local->skb_queue, skb); 1368 tasklet_schedule(&local->tasklet); 1369 } 1370 EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe); 1371 1372 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta, 1373 u8 tid, bool buffered) 1374 { 1375 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1376 1377 if (WARN_ON(tid >= IEEE80211_NUM_TIDS)) 1378 return; 1379 1380 if (buffered) 1381 set_bit(tid, &sta->driver_buffered_tids); 1382 else 1383 clear_bit(tid, &sta->driver_buffered_tids); 1384 1385 sta_info_recalc_tim(sta); 1386 } 1387 EXPORT_SYMBOL(ieee80211_sta_set_buffered); 1388 1389 int sta_info_move_state(struct sta_info *sta, 1390 enum ieee80211_sta_state new_state) 1391 { 1392 might_sleep(); 1393 1394 if (sta->sta_state == new_state) 1395 return 0; 1396 1397 /* check allowed transitions first */ 1398 1399 switch (new_state) { 1400 case IEEE80211_STA_NONE: 1401 if (sta->sta_state != IEEE80211_STA_AUTH) 1402 return -EINVAL; 1403 break; 1404 case IEEE80211_STA_AUTH: 1405 if (sta->sta_state != IEEE80211_STA_NONE && 1406 sta->sta_state != IEEE80211_STA_ASSOC) 1407 return -EINVAL; 1408 break; 1409 case IEEE80211_STA_ASSOC: 1410 if (sta->sta_state != IEEE80211_STA_AUTH && 1411 sta->sta_state != IEEE80211_STA_AUTHORIZED) 1412 return -EINVAL; 1413 break; 1414 case IEEE80211_STA_AUTHORIZED: 1415 if (sta->sta_state != IEEE80211_STA_ASSOC) 1416 return -EINVAL; 1417 break; 1418 default: 1419 WARN(1, "invalid state %d", new_state); 1420 return -EINVAL; 1421 } 1422 1423 sta_dbg(sta->sdata, "moving STA %pM to state %d\n", 1424 sta->sta.addr, new_state); 1425 1426 /* 1427 * notify the driver before the actual changes so it can 1428 * fail the transition 1429 */ 1430 if (test_sta_flag(sta, WLAN_STA_INSERTED)) { 1431 int err = drv_sta_state(sta->local, sta->sdata, sta, 1432 sta->sta_state, new_state); 1433 if (err) 1434 return err; 1435 } 1436 1437 /* reflect the change in all state variables */ 1438 1439 switch (new_state) { 1440 case IEEE80211_STA_NONE: 1441 if (sta->sta_state == IEEE80211_STA_AUTH) 1442 clear_bit(WLAN_STA_AUTH, &sta->_flags); 1443 break; 1444 case IEEE80211_STA_AUTH: 1445 if (sta->sta_state == IEEE80211_STA_NONE) 1446 set_bit(WLAN_STA_AUTH, &sta->_flags); 1447 else if (sta->sta_state == IEEE80211_STA_ASSOC) 1448 clear_bit(WLAN_STA_ASSOC, &sta->_flags); 1449 break; 1450 case IEEE80211_STA_ASSOC: 1451 if (sta->sta_state == IEEE80211_STA_AUTH) { 1452 set_bit(WLAN_STA_ASSOC, &sta->_flags); 1453 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) { 1454 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1455 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1456 !sta->sdata->u.vlan.sta)) 1457 atomic_dec(&sta->sdata->bss->num_mcast_sta); 1458 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags); 1459 } 1460 break; 1461 case IEEE80211_STA_AUTHORIZED: 1462 if (sta->sta_state == IEEE80211_STA_ASSOC) { 1463 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 1464 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1465 !sta->sdata->u.vlan.sta)) 1466 atomic_inc(&sta->sdata->bss->num_mcast_sta); 1467 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags); 1468 } 1469 break; 1470 default: 1471 break; 1472 } 1473 1474 sta->sta_state = new_state; 1475 1476 return 0; 1477 } 1478