1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/netdevice.h> 13 #include <linux/types.h> 14 #include <linux/slab.h> 15 #include <linux/skbuff.h> 16 #include <linux/if_arp.h> 17 #include <linux/timer.h> 18 #include <linux/rtnetlink.h> 19 20 #include <net/mac80211.h> 21 #include "ieee80211_i.h" 22 #include "driver-ops.h" 23 #include "rate.h" 24 #include "sta_info.h" 25 #include "debugfs_sta.h" 26 #include "mesh.h" 27 28 /** 29 * DOC: STA information lifetime rules 30 * 31 * STA info structures (&struct sta_info) are managed in a hash table 32 * for faster lookup and a list for iteration. They are managed using 33 * RCU, i.e. access to the list and hash table is protected by RCU. 34 * 35 * Upon allocating a STA info structure with sta_info_alloc(), the caller 36 * owns that structure. It must then insert it into the hash table using 37 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter 38 * case (which acquires an rcu read section but must not be called from 39 * within one) will the pointer still be valid after the call. Note that 40 * the caller may not do much with the STA info before inserting it, in 41 * particular, it may not start any mesh peer link management or add 42 * encryption keys. 43 * 44 * When the insertion fails (sta_info_insert()) returns non-zero), the 45 * structure will have been freed by sta_info_insert()! 46 * 47 * Station entries are added by mac80211 when you establish a link with a 48 * peer. This means different things for the different type of interfaces 49 * we support. For a regular station this mean we add the AP sta when we 50 * receive an association response from the AP. For IBSS this occurs when 51 * get to know about a peer on the same IBSS. For WDS we add the sta for 52 * the peer immediately upon device open. When using AP mode we add stations 53 * for each respective station upon request from userspace through nl80211. 54 * 55 * In order to remove a STA info structure, various sta_info_destroy_*() 56 * calls are available. 57 * 58 * There is no concept of ownership on a STA entry, each structure is 59 * owned by the global hash table/list until it is removed. All users of 60 * the structure need to be RCU protected so that the structure won't be 61 * freed before they are done using it. 62 */ 63 64 /* Caller must hold local->sta_lock */ 65 static int sta_info_hash_del(struct ieee80211_local *local, 66 struct sta_info *sta) 67 { 68 struct sta_info *s; 69 70 s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)], 71 lockdep_is_held(&local->sta_lock)); 72 if (!s) 73 return -ENOENT; 74 if (s == sta) { 75 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], 76 s->hnext); 77 return 0; 78 } 79 80 while (rcu_access_pointer(s->hnext) && 81 rcu_access_pointer(s->hnext) != sta) 82 s = rcu_dereference_protected(s->hnext, 83 lockdep_is_held(&local->sta_lock)); 84 if (rcu_access_pointer(s->hnext)) { 85 rcu_assign_pointer(s->hnext, sta->hnext); 86 return 0; 87 } 88 89 return -ENOENT; 90 } 91 92 /* protected by RCU */ 93 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata, 94 const u8 *addr) 95 { 96 struct ieee80211_local *local = sdata->local; 97 struct sta_info *sta; 98 99 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], 100 lockdep_is_held(&local->sta_lock) || 101 lockdep_is_held(&local->sta_mtx)); 102 while (sta) { 103 if (sta->sdata == sdata && 104 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) 105 break; 106 sta = rcu_dereference_check(sta->hnext, 107 lockdep_is_held(&local->sta_lock) || 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 */ 117 struct 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_lock) || 125 lockdep_is_held(&local->sta_mtx)); 126 while (sta) { 127 if ((sta->sdata == sdata || 128 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) && 129 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) 130 break; 131 sta = rcu_dereference_check(sta->hnext, 132 lockdep_is_held(&local->sta_lock) || 133 lockdep_is_held(&local->sta_mtx)); 134 } 135 return sta; 136 } 137 138 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, 139 int idx) 140 { 141 struct ieee80211_local *local = sdata->local; 142 struct sta_info *sta; 143 int i = 0; 144 145 list_for_each_entry_rcu(sta, &local->sta_list, list) { 146 if (sdata != sta->sdata) 147 continue; 148 if (i < idx) { 149 ++i; 150 continue; 151 } 152 return sta; 153 } 154 155 return NULL; 156 } 157 158 /** 159 * __sta_info_free - internal STA free helper 160 * 161 * @local: pointer to the global information 162 * @sta: STA info to free 163 * 164 * This function must undo everything done by sta_info_alloc() 165 * that may happen before sta_info_insert(). 166 */ 167 static void __sta_info_free(struct ieee80211_local *local, 168 struct sta_info *sta) 169 { 170 if (sta->rate_ctrl) { 171 rate_control_free_sta(sta); 172 rate_control_put(sta->rate_ctrl); 173 } 174 175 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 176 wiphy_debug(local->hw.wiphy, "Destroyed STA %pM\n", sta->sta.addr); 177 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 178 179 kfree(sta); 180 } 181 182 /* Caller must hold local->sta_lock */ 183 static void sta_info_hash_add(struct ieee80211_local *local, 184 struct sta_info *sta) 185 { 186 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)]; 187 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta); 188 } 189 190 static void sta_unblock(struct work_struct *wk) 191 { 192 struct sta_info *sta; 193 194 sta = container_of(wk, struct sta_info, drv_unblock_wk); 195 196 if (sta->dead) 197 return; 198 199 if (!test_sta_flags(sta, WLAN_STA_PS_STA)) 200 ieee80211_sta_ps_deliver_wakeup(sta); 201 else if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL)) { 202 clear_sta_flags(sta, WLAN_STA_PS_DRIVER); 203 ieee80211_sta_ps_deliver_poll_response(sta); 204 } else 205 clear_sta_flags(sta, WLAN_STA_PS_DRIVER); 206 } 207 208 static int sta_prepare_rate_control(struct ieee80211_local *local, 209 struct sta_info *sta, gfp_t gfp) 210 { 211 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) 212 return 0; 213 214 sta->rate_ctrl = rate_control_get(local->rate_ctrl); 215 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, 216 &sta->sta, gfp); 217 if (!sta->rate_ctrl_priv) { 218 rate_control_put(sta->rate_ctrl); 219 return -ENOMEM; 220 } 221 222 return 0; 223 } 224 225 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, 226 u8 *addr, gfp_t gfp) 227 { 228 struct ieee80211_local *local = sdata->local; 229 struct sta_info *sta; 230 struct timespec uptime; 231 int i; 232 233 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp); 234 if (!sta) 235 return NULL; 236 237 spin_lock_init(&sta->lock); 238 spin_lock_init(&sta->flaglock); 239 INIT_WORK(&sta->drv_unblock_wk, sta_unblock); 240 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work); 241 mutex_init(&sta->ampdu_mlme.mtx); 242 243 memcpy(sta->sta.addr, addr, ETH_ALEN); 244 sta->local = local; 245 sta->sdata = sdata; 246 sta->last_rx = jiffies; 247 248 do_posix_clock_monotonic_gettime(&uptime); 249 sta->last_connected = uptime.tv_sec; 250 ewma_init(&sta->avg_signal, 1024, 8); 251 252 if (sta_prepare_rate_control(local, sta, gfp)) { 253 kfree(sta); 254 return NULL; 255 } 256 257 for (i = 0; i < STA_TID_NUM; i++) { 258 /* 259 * timer_to_tid must be initialized with identity mapping 260 * to enable session_timer's data differentiation. See 261 * sta_rx_agg_session_timer_expired for usage. 262 */ 263 sta->timer_to_tid[i] = i; 264 } 265 skb_queue_head_init(&sta->ps_tx_buf); 266 skb_queue_head_init(&sta->tx_filtered); 267 268 for (i = 0; i < NUM_RX_DATA_QUEUES; i++) 269 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX); 270 271 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 272 wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr); 273 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 274 275 #ifdef CONFIG_MAC80211_MESH 276 sta->plink_state = NL80211_PLINK_LISTEN; 277 init_timer(&sta->plink_timer); 278 #endif 279 280 return sta; 281 } 282 283 static int sta_info_finish_insert(struct sta_info *sta, bool async) 284 { 285 struct ieee80211_local *local = sta->local; 286 struct ieee80211_sub_if_data *sdata = sta->sdata; 287 struct station_info sinfo; 288 unsigned long flags; 289 int err = 0; 290 291 lockdep_assert_held(&local->sta_mtx); 292 293 /* notify driver */ 294 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 295 sdata = container_of(sdata->bss, 296 struct ieee80211_sub_if_data, 297 u.ap); 298 err = drv_sta_add(local, sdata, &sta->sta); 299 if (err) { 300 if (!async) 301 return err; 302 printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to driver (%d)" 303 " - keeping it anyway.\n", 304 sdata->name, sta->sta.addr, err); 305 } else { 306 sta->uploaded = true; 307 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 308 if (async) 309 wiphy_debug(local->hw.wiphy, 310 "Finished adding IBSS STA %pM\n", 311 sta->sta.addr); 312 #endif 313 } 314 315 sdata = sta->sdata; 316 317 if (!async) { 318 local->num_sta++; 319 local->sta_generation++; 320 smp_mb(); 321 322 /* make the station visible */ 323 spin_lock_irqsave(&local->sta_lock, flags); 324 sta_info_hash_add(local, sta); 325 spin_unlock_irqrestore(&local->sta_lock, flags); 326 } 327 328 list_add(&sta->list, &local->sta_list); 329 330 ieee80211_sta_debugfs_add(sta); 331 rate_control_add_sta_debugfs(sta); 332 333 sinfo.filled = 0; 334 sinfo.generation = local->sta_generation; 335 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL); 336 337 338 return 0; 339 } 340 341 static void sta_info_finish_pending(struct ieee80211_local *local) 342 { 343 struct sta_info *sta; 344 unsigned long flags; 345 346 spin_lock_irqsave(&local->sta_lock, flags); 347 while (!list_empty(&local->sta_pending_list)) { 348 sta = list_first_entry(&local->sta_pending_list, 349 struct sta_info, list); 350 list_del(&sta->list); 351 spin_unlock_irqrestore(&local->sta_lock, flags); 352 353 sta_info_finish_insert(sta, true); 354 355 spin_lock_irqsave(&local->sta_lock, flags); 356 } 357 spin_unlock_irqrestore(&local->sta_lock, flags); 358 } 359 360 static void sta_info_finish_work(struct work_struct *work) 361 { 362 struct ieee80211_local *local = 363 container_of(work, struct ieee80211_local, sta_finish_work); 364 365 mutex_lock(&local->sta_mtx); 366 sta_info_finish_pending(local); 367 mutex_unlock(&local->sta_mtx); 368 } 369 370 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU) 371 { 372 struct ieee80211_local *local = sta->local; 373 struct ieee80211_sub_if_data *sdata = sta->sdata; 374 unsigned long flags; 375 int err = 0; 376 377 /* 378 * Can't be a WARN_ON because it can be triggered through a race: 379 * something inserts a STA (on one CPU) without holding the RTNL 380 * and another CPU turns off the net device. 381 */ 382 if (unlikely(!ieee80211_sdata_running(sdata))) { 383 err = -ENETDOWN; 384 rcu_read_lock(); 385 goto out_free; 386 } 387 388 if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 || 389 is_multicast_ether_addr(sta->sta.addr))) { 390 err = -EINVAL; 391 rcu_read_lock(); 392 goto out_free; 393 } 394 395 /* 396 * In ad-hoc mode, we sometimes need to insert stations 397 * from tasklet context from the RX path. To avoid races, 398 * always do so in that case -- see the comment below. 399 */ 400 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 401 spin_lock_irqsave(&local->sta_lock, flags); 402 /* check if STA exists already */ 403 if (sta_info_get_bss(sdata, sta->sta.addr)) { 404 spin_unlock_irqrestore(&local->sta_lock, flags); 405 rcu_read_lock(); 406 err = -EEXIST; 407 goto out_free; 408 } 409 410 local->num_sta++; 411 local->sta_generation++; 412 smp_mb(); 413 sta_info_hash_add(local, sta); 414 415 list_add_tail(&sta->list, &local->sta_pending_list); 416 417 rcu_read_lock(); 418 spin_unlock_irqrestore(&local->sta_lock, flags); 419 420 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 421 wiphy_debug(local->hw.wiphy, "Added IBSS STA %pM\n", 422 sta->sta.addr); 423 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 424 425 ieee80211_queue_work(&local->hw, &local->sta_finish_work); 426 427 return 0; 428 } 429 430 /* 431 * On first glance, this will look racy, because the code 432 * below this point, which inserts a station with sleeping, 433 * unlocks the sta_lock between checking existence in the 434 * hash table and inserting into it. 435 * 436 * However, it is not racy against itself because it keeps 437 * the mutex locked. It still seems to race against the 438 * above code that atomically inserts the station... That, 439 * however, is not true because the above code can only 440 * be invoked for IBSS interfaces, and the below code will 441 * not be -- and the two do not race against each other as 442 * the hash table also keys off the interface. 443 */ 444 445 might_sleep(); 446 447 mutex_lock(&local->sta_mtx); 448 449 spin_lock_irqsave(&local->sta_lock, flags); 450 /* check if STA exists already */ 451 if (sta_info_get_bss(sdata, sta->sta.addr)) { 452 spin_unlock_irqrestore(&local->sta_lock, flags); 453 mutex_unlock(&local->sta_mtx); 454 rcu_read_lock(); 455 err = -EEXIST; 456 goto out_free; 457 } 458 459 spin_unlock_irqrestore(&local->sta_lock, flags); 460 461 err = sta_info_finish_insert(sta, false); 462 if (err) { 463 mutex_unlock(&local->sta_mtx); 464 rcu_read_lock(); 465 goto out_free; 466 } 467 468 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 469 wiphy_debug(local->hw.wiphy, "Inserted STA %pM\n", sta->sta.addr); 470 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 471 472 /* move reference to rcu-protected */ 473 rcu_read_lock(); 474 mutex_unlock(&local->sta_mtx); 475 476 if (ieee80211_vif_is_mesh(&sdata->vif)) 477 mesh_accept_plinks_update(sdata); 478 479 return 0; 480 out_free: 481 BUG_ON(!err); 482 __sta_info_free(local, sta); 483 return err; 484 } 485 486 int sta_info_insert(struct sta_info *sta) 487 { 488 int err = sta_info_insert_rcu(sta); 489 490 rcu_read_unlock(); 491 492 return err; 493 } 494 495 static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid) 496 { 497 /* 498 * This format has been mandated by the IEEE specifications, 499 * so this line may not be changed to use the __set_bit() format. 500 */ 501 bss->tim[aid / 8] |= (1 << (aid % 8)); 502 } 503 504 static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid) 505 { 506 /* 507 * This format has been mandated by the IEEE specifications, 508 * so this line may not be changed to use the __clear_bit() format. 509 */ 510 bss->tim[aid / 8] &= ~(1 << (aid % 8)); 511 } 512 513 static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss, 514 struct sta_info *sta) 515 { 516 BUG_ON(!bss); 517 518 __bss_tim_set(bss, sta->sta.aid); 519 520 if (sta->local->ops->set_tim) { 521 sta->local->tim_in_locked_section = true; 522 drv_set_tim(sta->local, &sta->sta, true); 523 sta->local->tim_in_locked_section = false; 524 } 525 } 526 527 void sta_info_set_tim_bit(struct sta_info *sta) 528 { 529 unsigned long flags; 530 531 BUG_ON(!sta->sdata->bss); 532 533 spin_lock_irqsave(&sta->local->sta_lock, flags); 534 __sta_info_set_tim_bit(sta->sdata->bss, sta); 535 spin_unlock_irqrestore(&sta->local->sta_lock, flags); 536 } 537 538 static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss, 539 struct sta_info *sta) 540 { 541 BUG_ON(!bss); 542 543 __bss_tim_clear(bss, sta->sta.aid); 544 545 if (sta->local->ops->set_tim) { 546 sta->local->tim_in_locked_section = true; 547 drv_set_tim(sta->local, &sta->sta, false); 548 sta->local->tim_in_locked_section = false; 549 } 550 } 551 552 void sta_info_clear_tim_bit(struct sta_info *sta) 553 { 554 unsigned long flags; 555 556 BUG_ON(!sta->sdata->bss); 557 558 spin_lock_irqsave(&sta->local->sta_lock, flags); 559 __sta_info_clear_tim_bit(sta->sdata->bss, sta); 560 spin_unlock_irqrestore(&sta->local->sta_lock, flags); 561 } 562 563 static int sta_info_buffer_expired(struct sta_info *sta, 564 struct sk_buff *skb) 565 { 566 struct ieee80211_tx_info *info; 567 int timeout; 568 569 if (!skb) 570 return 0; 571 572 info = IEEE80211_SKB_CB(skb); 573 574 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ 575 timeout = (sta->listen_interval * 576 sta->sdata->vif.bss_conf.beacon_int * 577 32 / 15625) * HZ; 578 if (timeout < STA_TX_BUFFER_EXPIRE) 579 timeout = STA_TX_BUFFER_EXPIRE; 580 return time_after(jiffies, info->control.jiffies + timeout); 581 } 582 583 584 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local, 585 struct sta_info *sta) 586 { 587 unsigned long flags; 588 struct sk_buff *skb; 589 590 if (skb_queue_empty(&sta->ps_tx_buf)) 591 return false; 592 593 for (;;) { 594 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags); 595 skb = skb_peek(&sta->ps_tx_buf); 596 if (sta_info_buffer_expired(sta, skb)) 597 skb = __skb_dequeue(&sta->ps_tx_buf); 598 else 599 skb = NULL; 600 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags); 601 602 if (!skb) 603 break; 604 605 local->total_ps_buffered--; 606 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 607 printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n", 608 sta->sta.addr); 609 #endif 610 dev_kfree_skb(skb); 611 612 if (skb_queue_empty(&sta->ps_tx_buf) && 613 !test_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF)) 614 sta_info_clear_tim_bit(sta); 615 } 616 617 return true; 618 } 619 620 static int __must_check __sta_info_destroy(struct sta_info *sta) 621 { 622 struct ieee80211_local *local; 623 struct ieee80211_sub_if_data *sdata; 624 struct sk_buff *skb; 625 unsigned long flags; 626 int ret, i; 627 628 might_sleep(); 629 630 if (!sta) 631 return -ENOENT; 632 633 local = sta->local; 634 sdata = sta->sdata; 635 636 /* 637 * Before removing the station from the driver and 638 * rate control, it might still start new aggregation 639 * sessions -- block that to make sure the tear-down 640 * will be sufficient. 641 */ 642 set_sta_flags(sta, WLAN_STA_BLOCK_BA); 643 ieee80211_sta_tear_down_BA_sessions(sta, true); 644 645 spin_lock_irqsave(&local->sta_lock, flags); 646 ret = sta_info_hash_del(local, sta); 647 /* this might still be the pending list ... which is fine */ 648 if (!ret) 649 list_del(&sta->list); 650 spin_unlock_irqrestore(&local->sta_lock, flags); 651 if (ret) 652 return ret; 653 654 mutex_lock(&local->key_mtx); 655 for (i = 0; i < NUM_DEFAULT_KEYS; i++) 656 __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i])); 657 if (sta->ptk) 658 __ieee80211_key_free(key_mtx_dereference(local, sta->ptk)); 659 mutex_unlock(&local->key_mtx); 660 661 sta->dead = true; 662 663 if (test_and_clear_sta_flags(sta, 664 WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) { 665 BUG_ON(!sdata->bss); 666 667 atomic_dec(&sdata->bss->num_sta_ps); 668 __sta_info_clear_tim_bit(sdata->bss, sta); 669 } 670 671 local->num_sta--; 672 local->sta_generation++; 673 674 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 675 rcu_assign_pointer(sdata->u.vlan.sta, NULL); 676 677 if (sta->uploaded) { 678 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 679 sdata = container_of(sdata->bss, 680 struct ieee80211_sub_if_data, 681 u.ap); 682 drv_sta_remove(local, sdata, &sta->sta); 683 sdata = sta->sdata; 684 } 685 686 /* 687 * At this point, after we wait for an RCU grace period, 688 * neither mac80211 nor the driver can reference this 689 * sta struct any more except by still existing timers 690 * associated with this station that we clean up below. 691 */ 692 synchronize_rcu(); 693 694 #ifdef CONFIG_MAC80211_MESH 695 if (ieee80211_vif_is_mesh(&sdata->vif)) 696 mesh_accept_plinks_update(sdata); 697 #endif 698 699 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 700 wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr); 701 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 702 cancel_work_sync(&sta->drv_unblock_wk); 703 704 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL); 705 706 rate_control_remove_sta_debugfs(sta); 707 ieee80211_sta_debugfs_remove(sta); 708 709 #ifdef CONFIG_MAC80211_MESH 710 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) { 711 mesh_plink_deactivate(sta); 712 del_timer_sync(&sta->plink_timer); 713 } 714 #endif 715 716 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { 717 local->total_ps_buffered--; 718 dev_kfree_skb_any(skb); 719 } 720 721 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) 722 dev_kfree_skb_any(skb); 723 724 __sta_info_free(local, sta); 725 726 return 0; 727 } 728 729 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr) 730 { 731 struct sta_info *sta; 732 int ret; 733 734 mutex_lock(&sdata->local->sta_mtx); 735 sta = sta_info_get(sdata, addr); 736 ret = __sta_info_destroy(sta); 737 mutex_unlock(&sdata->local->sta_mtx); 738 739 return ret; 740 } 741 742 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata, 743 const u8 *addr) 744 { 745 struct sta_info *sta; 746 int ret; 747 748 mutex_lock(&sdata->local->sta_mtx); 749 sta = sta_info_get_bss(sdata, addr); 750 ret = __sta_info_destroy(sta); 751 mutex_unlock(&sdata->local->sta_mtx); 752 753 return ret; 754 } 755 756 static void sta_info_cleanup(unsigned long data) 757 { 758 struct ieee80211_local *local = (struct ieee80211_local *) data; 759 struct sta_info *sta; 760 bool timer_needed = false; 761 762 rcu_read_lock(); 763 list_for_each_entry_rcu(sta, &local->sta_list, list) 764 if (sta_info_cleanup_expire_buffered(local, sta)) 765 timer_needed = true; 766 rcu_read_unlock(); 767 768 if (local->quiescing) 769 return; 770 771 if (!timer_needed) 772 return; 773 774 mod_timer(&local->sta_cleanup, 775 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL)); 776 } 777 778 void sta_info_init(struct ieee80211_local *local) 779 { 780 spin_lock_init(&local->sta_lock); 781 mutex_init(&local->sta_mtx); 782 INIT_LIST_HEAD(&local->sta_list); 783 INIT_LIST_HEAD(&local->sta_pending_list); 784 INIT_WORK(&local->sta_finish_work, sta_info_finish_work); 785 786 setup_timer(&local->sta_cleanup, sta_info_cleanup, 787 (unsigned long)local); 788 } 789 790 void sta_info_stop(struct ieee80211_local *local) 791 { 792 del_timer(&local->sta_cleanup); 793 sta_info_flush(local, NULL); 794 } 795 796 /** 797 * sta_info_flush - flush matching STA entries from the STA table 798 * 799 * Returns the number of removed STA entries. 800 * 801 * @local: local interface data 802 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs 803 */ 804 int sta_info_flush(struct ieee80211_local *local, 805 struct ieee80211_sub_if_data *sdata) 806 { 807 struct sta_info *sta, *tmp; 808 int ret = 0; 809 810 might_sleep(); 811 812 mutex_lock(&local->sta_mtx); 813 814 sta_info_finish_pending(local); 815 816 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 817 if (!sdata || sdata == sta->sdata) 818 WARN_ON(__sta_info_destroy(sta)); 819 } 820 mutex_unlock(&local->sta_mtx); 821 822 return ret; 823 } 824 825 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, 826 unsigned long exp_time) 827 { 828 struct ieee80211_local *local = sdata->local; 829 struct sta_info *sta, *tmp; 830 831 mutex_lock(&local->sta_mtx); 832 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) 833 if (time_after(jiffies, sta->last_rx + exp_time)) { 834 #ifdef CONFIG_MAC80211_IBSS_DEBUG 835 printk(KERN_DEBUG "%s: expiring inactive STA %pM\n", 836 sdata->name, sta->sta.addr); 837 #endif 838 WARN_ON(__sta_info_destroy(sta)); 839 } 840 mutex_unlock(&local->sta_mtx); 841 } 842 843 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw, 844 const u8 *addr, 845 const u8 *localaddr) 846 { 847 struct sta_info *sta, *nxt; 848 849 /* 850 * Just return a random station if localaddr is NULL 851 * ... first in list. 852 */ 853 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) { 854 if (localaddr && 855 compare_ether_addr(sta->sdata->vif.addr, localaddr) != 0) 856 continue; 857 if (!sta->uploaded) 858 return NULL; 859 return &sta->sta; 860 } 861 862 return NULL; 863 } 864 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr); 865 866 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif, 867 const u8 *addr) 868 { 869 struct sta_info *sta; 870 871 if (!vif) 872 return NULL; 873 874 sta = sta_info_get_bss(vif_to_sdata(vif), addr); 875 if (!sta) 876 return NULL; 877 878 if (!sta->uploaded) 879 return NULL; 880 881 return &sta->sta; 882 } 883 EXPORT_SYMBOL(ieee80211_find_sta); 884 885 static void clear_sta_ps_flags(void *_sta) 886 { 887 struct sta_info *sta = _sta; 888 889 clear_sta_flags(sta, WLAN_STA_PS_DRIVER | WLAN_STA_PS_STA); 890 } 891 892 /* powersave support code */ 893 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta) 894 { 895 struct ieee80211_sub_if_data *sdata = sta->sdata; 896 struct ieee80211_local *local = sdata->local; 897 int sent, buffered; 898 899 clear_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF); 900 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) 901 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta); 902 903 if (!skb_queue_empty(&sta->ps_tx_buf)) 904 sta_info_clear_tim_bit(sta); 905 906 /* Send all buffered frames to the station */ 907 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered); 908 buffered = ieee80211_add_pending_skbs_fn(local, &sta->ps_tx_buf, 909 clear_sta_ps_flags, sta); 910 sent += buffered; 911 local->total_ps_buffered -= buffered; 912 913 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 914 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames " 915 "since STA not sleeping anymore\n", sdata->name, 916 sta->sta.addr, sta->sta.aid, sent - buffered, buffered); 917 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 918 } 919 920 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta) 921 { 922 struct ieee80211_sub_if_data *sdata = sta->sdata; 923 struct ieee80211_local *local = sdata->local; 924 struct sk_buff *skb; 925 int no_pending_pkts; 926 927 skb = skb_dequeue(&sta->tx_filtered); 928 if (!skb) { 929 skb = skb_dequeue(&sta->ps_tx_buf); 930 if (skb) 931 local->total_ps_buffered--; 932 } 933 no_pending_pkts = skb_queue_empty(&sta->tx_filtered) && 934 skb_queue_empty(&sta->ps_tx_buf); 935 936 if (skb) { 937 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 938 struct ieee80211_hdr *hdr = 939 (struct ieee80211_hdr *) skb->data; 940 941 /* 942 * Tell TX path to send this frame even though the STA may 943 * still remain is PS mode after this frame exchange. 944 */ 945 info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE; 946 947 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 948 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", 949 sta->sta.addr, sta->sta.aid, 950 skb_queue_len(&sta->ps_tx_buf)); 951 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 952 953 /* Use MoreData flag to indicate whether there are more 954 * buffered frames for this STA */ 955 if (no_pending_pkts) 956 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); 957 else 958 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); 959 960 ieee80211_add_pending_skb(local, skb); 961 962 if (no_pending_pkts) 963 sta_info_clear_tim_bit(sta); 964 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 965 } else { 966 /* 967 * FIXME: This can be the result of a race condition between 968 * us expiring a frame and the station polling for it. 969 * Should we send it a null-func frame indicating we 970 * have nothing buffered for it? 971 */ 972 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " 973 "though there are no buffered frames for it\n", 974 sdata->name, sta->sta.addr); 975 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 976 } 977 } 978 979 void ieee80211_sta_block_awake(struct ieee80211_hw *hw, 980 struct ieee80211_sta *pubsta, bool block) 981 { 982 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 983 984 trace_api_sta_block_awake(sta->local, pubsta, block); 985 986 if (block) 987 set_sta_flags(sta, WLAN_STA_PS_DRIVER); 988 else if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) 989 ieee80211_queue_work(hw, &sta->drv_unblock_wk); 990 } 991 EXPORT_SYMBOL(ieee80211_sta_block_awake); 992 993 void ieee80211_sta_set_tim(struct ieee80211_sta *pubsta) 994 { 995 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 996 997 set_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF); 998 sta_info_set_tim_bit(sta); 999 } 1000 EXPORT_SYMBOL(ieee80211_sta_set_tim); 1001