1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #include <net/mac80211.h> 12 #include <net/ieee80211_radiotap.h> 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/netdevice.h> 16 #include <linux/types.h> 17 #include <linux/slab.h> 18 #include <linux/skbuff.h> 19 #include <linux/etherdevice.h> 20 #include <linux/if_arp.h> 21 #include <linux/wireless.h> 22 #include <linux/rtnetlink.h> 23 #include <linux/bitmap.h> 24 #include <net/net_namespace.h> 25 #include <net/cfg80211.h> 26 27 #include "ieee80211_i.h" 28 #include "rate.h" 29 #include "mesh.h" 30 #include "wep.h" 31 #include "wme.h" 32 #include "aes_ccm.h" 33 #include "led.h" 34 #include "cfg.h" 35 #include "debugfs.h" 36 #include "debugfs_netdev.h" 37 38 /* 39 * For seeing transmitted packets on monitor interfaces 40 * we have a radiotap header too. 41 */ 42 struct ieee80211_tx_status_rtap_hdr { 43 struct ieee80211_radiotap_header hdr; 44 __le16 tx_flags; 45 u8 data_retries; 46 } __attribute__ ((packed)); 47 48 /* common interface routines */ 49 50 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr) 51 { 52 memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */ 53 return ETH_ALEN; 54 } 55 56 /* must be called under mdev tx lock */ 57 static void ieee80211_configure_filter(struct ieee80211_local *local) 58 { 59 unsigned int changed_flags; 60 unsigned int new_flags = 0; 61 62 if (atomic_read(&local->iff_promiscs)) 63 new_flags |= FIF_PROMISC_IN_BSS; 64 65 if (atomic_read(&local->iff_allmultis)) 66 new_flags |= FIF_ALLMULTI; 67 68 if (local->monitors) 69 new_flags |= FIF_BCN_PRBRESP_PROMISC; 70 71 if (local->fif_fcsfail) 72 new_flags |= FIF_FCSFAIL; 73 74 if (local->fif_plcpfail) 75 new_flags |= FIF_PLCPFAIL; 76 77 if (local->fif_control) 78 new_flags |= FIF_CONTROL; 79 80 if (local->fif_other_bss) 81 new_flags |= FIF_OTHER_BSS; 82 83 changed_flags = local->filter_flags ^ new_flags; 84 85 /* be a bit nasty */ 86 new_flags |= (1<<31); 87 88 local->ops->configure_filter(local_to_hw(local), 89 changed_flags, &new_flags, 90 local->mdev->mc_count, 91 local->mdev->mc_list); 92 93 WARN_ON(new_flags & (1<<31)); 94 95 local->filter_flags = new_flags & ~(1<<31); 96 } 97 98 /* master interface */ 99 100 static int ieee80211_master_open(struct net_device *dev) 101 { 102 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 103 struct ieee80211_sub_if_data *sdata; 104 int res = -EOPNOTSUPP; 105 106 /* we hold the RTNL here so can safely walk the list */ 107 list_for_each_entry(sdata, &local->interfaces, list) { 108 if (netif_running(sdata->dev)) { 109 res = 0; 110 break; 111 } 112 } 113 114 if (res) 115 return res; 116 117 netif_tx_start_all_queues(local->mdev); 118 119 return 0; 120 } 121 122 static int ieee80211_master_stop(struct net_device *dev) 123 { 124 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 125 struct ieee80211_sub_if_data *sdata; 126 127 /* we hold the RTNL here so can safely walk the list */ 128 list_for_each_entry(sdata, &local->interfaces, list) 129 if (netif_running(sdata->dev)) 130 dev_close(sdata->dev); 131 132 return 0; 133 } 134 135 static void ieee80211_master_set_multicast_list(struct net_device *dev) 136 { 137 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 138 139 ieee80211_configure_filter(local); 140 } 141 142 /* regular interfaces */ 143 144 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) 145 { 146 int meshhdrlen; 147 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 148 149 meshhdrlen = (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) ? 5 : 0; 150 151 /* FIX: what would be proper limits for MTU? 152 * This interface uses 802.3 frames. */ 153 if (new_mtu < 256 || 154 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) { 155 return -EINVAL; 156 } 157 158 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 159 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu); 160 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 161 dev->mtu = new_mtu; 162 return 0; 163 } 164 165 static inline int identical_mac_addr_allowed(int type1, int type2) 166 { 167 return (type1 == IEEE80211_IF_TYPE_MNTR || 168 type2 == IEEE80211_IF_TYPE_MNTR || 169 (type1 == IEEE80211_IF_TYPE_AP && 170 type2 == IEEE80211_IF_TYPE_WDS) || 171 (type1 == IEEE80211_IF_TYPE_WDS && 172 (type2 == IEEE80211_IF_TYPE_WDS || 173 type2 == IEEE80211_IF_TYPE_AP)) || 174 (type1 == IEEE80211_IF_TYPE_AP && 175 type2 == IEEE80211_IF_TYPE_VLAN) || 176 (type1 == IEEE80211_IF_TYPE_VLAN && 177 (type2 == IEEE80211_IF_TYPE_AP || 178 type2 == IEEE80211_IF_TYPE_VLAN))); 179 } 180 181 static int ieee80211_open(struct net_device *dev) 182 { 183 struct ieee80211_sub_if_data *sdata, *nsdata; 184 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 185 struct sta_info *sta; 186 struct ieee80211_if_init_conf conf; 187 u32 changed = 0; 188 int res; 189 bool need_hw_reconfig = 0; 190 191 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 192 193 /* we hold the RTNL here so can safely walk the list */ 194 list_for_each_entry(nsdata, &local->interfaces, list) { 195 struct net_device *ndev = nsdata->dev; 196 197 if (ndev != dev && netif_running(ndev)) { 198 /* 199 * Allow only a single IBSS interface to be up at any 200 * time. This is restricted because beacon distribution 201 * cannot work properly if both are in the same IBSS. 202 * 203 * To remove this restriction we'd have to disallow them 204 * from setting the same SSID on different IBSS interfaces 205 * belonging to the same hardware. Then, however, we're 206 * faced with having to adopt two different TSF timers... 207 */ 208 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && 209 nsdata->vif.type == IEEE80211_IF_TYPE_IBSS) 210 return -EBUSY; 211 212 /* 213 * The remaining checks are only performed for interfaces 214 * with the same MAC address. 215 */ 216 if (compare_ether_addr(dev->dev_addr, ndev->dev_addr)) 217 continue; 218 219 /* 220 * check whether it may have the same address 221 */ 222 if (!identical_mac_addr_allowed(sdata->vif.type, 223 nsdata->vif.type)) 224 return -ENOTUNIQ; 225 226 /* 227 * can only add VLANs to enabled APs 228 */ 229 if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN && 230 nsdata->vif.type == IEEE80211_IF_TYPE_AP) 231 sdata->bss = &nsdata->u.ap; 232 } 233 } 234 235 switch (sdata->vif.type) { 236 case IEEE80211_IF_TYPE_WDS: 237 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 238 return -ENOLINK; 239 break; 240 case IEEE80211_IF_TYPE_VLAN: 241 if (!sdata->bss) 242 return -ENOLINK; 243 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 244 break; 245 case IEEE80211_IF_TYPE_AP: 246 sdata->bss = &sdata->u.ap; 247 break; 248 case IEEE80211_IF_TYPE_MESH_POINT: 249 /* mesh ifaces must set allmulti to forward mcast traffic */ 250 atomic_inc(&local->iff_allmultis); 251 break; 252 case IEEE80211_IF_TYPE_STA: 253 case IEEE80211_IF_TYPE_MNTR: 254 case IEEE80211_IF_TYPE_IBSS: 255 /* no special treatment */ 256 break; 257 case IEEE80211_IF_TYPE_INVALID: 258 /* cannot happen */ 259 WARN_ON(1); 260 break; 261 } 262 263 if (local->open_count == 0) { 264 res = 0; 265 if (local->ops->start) 266 res = local->ops->start(local_to_hw(local)); 267 if (res) 268 goto err_del_bss; 269 need_hw_reconfig = 1; 270 ieee80211_led_radio(local, local->hw.conf.radio_enabled); 271 } 272 273 switch (sdata->vif.type) { 274 case IEEE80211_IF_TYPE_VLAN: 275 /* no need to tell driver */ 276 break; 277 case IEEE80211_IF_TYPE_MNTR: 278 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 279 local->cooked_mntrs++; 280 break; 281 } 282 283 /* must be before the call to ieee80211_configure_filter */ 284 local->monitors++; 285 if (local->monitors == 1) 286 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP; 287 288 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL) 289 local->fif_fcsfail++; 290 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL) 291 local->fif_plcpfail++; 292 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) 293 local->fif_control++; 294 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS) 295 local->fif_other_bss++; 296 297 netif_addr_lock_bh(local->mdev); 298 ieee80211_configure_filter(local); 299 netif_addr_unlock_bh(local->mdev); 300 break; 301 case IEEE80211_IF_TYPE_STA: 302 case IEEE80211_IF_TYPE_IBSS: 303 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET; 304 /* fall through */ 305 default: 306 conf.vif = &sdata->vif; 307 conf.type = sdata->vif.type; 308 conf.mac_addr = dev->dev_addr; 309 res = local->ops->add_interface(local_to_hw(local), &conf); 310 if (res) 311 goto err_stop; 312 313 if (ieee80211_vif_is_mesh(&sdata->vif)) 314 ieee80211_start_mesh(sdata->dev); 315 changed |= ieee80211_reset_erp_info(dev); 316 ieee80211_bss_info_change_notify(sdata, changed); 317 ieee80211_enable_keys(sdata); 318 319 if (sdata->vif.type == IEEE80211_IF_TYPE_STA && 320 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)) 321 netif_carrier_off(dev); 322 else 323 netif_carrier_on(dev); 324 } 325 326 if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) { 327 /* Create STA entry for the WDS peer */ 328 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 329 GFP_KERNEL); 330 if (!sta) { 331 res = -ENOMEM; 332 goto err_del_interface; 333 } 334 335 /* no locking required since STA is not live yet */ 336 sta->flags |= WLAN_STA_AUTHORIZED; 337 338 res = sta_info_insert(sta); 339 if (res) { 340 /* STA has been freed */ 341 goto err_del_interface; 342 } 343 } 344 345 if (local->open_count == 0) { 346 res = dev_open(local->mdev); 347 WARN_ON(res); 348 if (res) 349 goto err_del_interface; 350 tasklet_enable(&local->tx_pending_tasklet); 351 tasklet_enable(&local->tasklet); 352 } 353 354 /* 355 * set_multicast_list will be invoked by the networking core 356 * which will check whether any increments here were done in 357 * error and sync them down to the hardware as filter flags. 358 */ 359 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 360 atomic_inc(&local->iff_allmultis); 361 362 if (sdata->flags & IEEE80211_SDATA_PROMISC) 363 atomic_inc(&local->iff_promiscs); 364 365 local->open_count++; 366 if (need_hw_reconfig) 367 ieee80211_hw_config(local); 368 369 /* 370 * ieee80211_sta_work is disabled while network interface 371 * is down. Therefore, some configuration changes may not 372 * yet be effective. Trigger execution of ieee80211_sta_work 373 * to fix this. 374 */ 375 if (sdata->vif.type == IEEE80211_IF_TYPE_STA || 376 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) { 377 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 378 queue_work(local->hw.workqueue, &ifsta->work); 379 } 380 381 netif_tx_start_all_queues(dev); 382 383 return 0; 384 err_del_interface: 385 local->ops->remove_interface(local_to_hw(local), &conf); 386 err_stop: 387 if (!local->open_count && local->ops->stop) 388 local->ops->stop(local_to_hw(local)); 389 err_del_bss: 390 sdata->bss = NULL; 391 if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN) 392 list_del(&sdata->u.vlan.list); 393 return res; 394 } 395 396 static int ieee80211_stop(struct net_device *dev) 397 { 398 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 399 struct ieee80211_local *local = sdata->local; 400 struct ieee80211_if_init_conf conf; 401 struct sta_info *sta; 402 403 /* 404 * Stop TX on this interface first. 405 */ 406 netif_tx_stop_all_queues(dev); 407 408 /* 409 * Now delete all active aggregation sessions. 410 */ 411 rcu_read_lock(); 412 413 list_for_each_entry_rcu(sta, &local->sta_list, list) { 414 if (sta->sdata == sdata) 415 ieee80211_sta_tear_down_BA_sessions(dev, sta->addr); 416 } 417 418 rcu_read_unlock(); 419 420 /* 421 * Remove all stations associated with this interface. 422 * 423 * This must be done before calling ops->remove_interface() 424 * because otherwise we can later invoke ops->sta_notify() 425 * whenever the STAs are removed, and that invalidates driver 426 * assumptions about always getting a vif pointer that is valid 427 * (because if we remove a STA after ops->remove_interface() 428 * the driver will have removed the vif info already!) 429 * 430 * We could relax this and only unlink the stations from the 431 * hash table and list but keep them on a per-sdata list that 432 * will be inserted back again when the interface is brought 433 * up again, but I don't currently see a use case for that, 434 * except with WDS which gets a STA entry created when it is 435 * brought up. 436 */ 437 sta_info_flush(local, sdata); 438 439 /* 440 * Don't count this interface for promisc/allmulti while it 441 * is down. dev_mc_unsync() will invoke set_multicast_list 442 * on the master interface which will sync these down to the 443 * hardware as filter flags. 444 */ 445 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 446 atomic_dec(&local->iff_allmultis); 447 448 if (sdata->flags & IEEE80211_SDATA_PROMISC) 449 atomic_dec(&local->iff_promiscs); 450 451 dev_mc_unsync(local->mdev, dev); 452 453 /* APs need special treatment */ 454 if (sdata->vif.type == IEEE80211_IF_TYPE_AP) { 455 struct ieee80211_sub_if_data *vlan, *tmp; 456 struct beacon_data *old_beacon = sdata->u.ap.beacon; 457 458 /* remove beacon */ 459 rcu_assign_pointer(sdata->u.ap.beacon, NULL); 460 synchronize_rcu(); 461 kfree(old_beacon); 462 463 /* down all dependent devices, that is VLANs */ 464 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans, 465 u.vlan.list) 466 dev_close(vlan->dev); 467 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 468 } 469 470 local->open_count--; 471 472 switch (sdata->vif.type) { 473 case IEEE80211_IF_TYPE_VLAN: 474 list_del(&sdata->u.vlan.list); 475 /* no need to tell driver */ 476 break; 477 case IEEE80211_IF_TYPE_MNTR: 478 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 479 local->cooked_mntrs--; 480 break; 481 } 482 483 local->monitors--; 484 if (local->monitors == 0) 485 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP; 486 487 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL) 488 local->fif_fcsfail--; 489 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL) 490 local->fif_plcpfail--; 491 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) 492 local->fif_control--; 493 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS) 494 local->fif_other_bss--; 495 496 netif_addr_lock_bh(local->mdev); 497 ieee80211_configure_filter(local); 498 netif_addr_unlock_bh(local->mdev); 499 break; 500 case IEEE80211_IF_TYPE_MESH_POINT: 501 /* allmulti is always set on mesh ifaces */ 502 atomic_dec(&local->iff_allmultis); 503 /* fall through */ 504 case IEEE80211_IF_TYPE_STA: 505 case IEEE80211_IF_TYPE_IBSS: 506 sdata->u.sta.state = IEEE80211_DISABLED; 507 memset(sdata->u.sta.bssid, 0, ETH_ALEN); 508 del_timer_sync(&sdata->u.sta.timer); 509 /* 510 * When we get here, the interface is marked down. 511 * Call synchronize_rcu() to wait for the RX path 512 * should it be using the interface and enqueuing 513 * frames at this very time on another CPU. 514 */ 515 synchronize_rcu(); 516 skb_queue_purge(&sdata->u.sta.skb_queue); 517 518 if (local->scan_dev == sdata->dev) { 519 if (!local->ops->hw_scan) { 520 local->sta_sw_scanning = 0; 521 cancel_delayed_work(&local->scan_work); 522 } else 523 local->sta_hw_scanning = 0; 524 } 525 526 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED; 527 kfree(sdata->u.sta.extra_ie); 528 sdata->u.sta.extra_ie = NULL; 529 sdata->u.sta.extra_ie_len = 0; 530 /* fall through */ 531 default: 532 conf.vif = &sdata->vif; 533 conf.type = sdata->vif.type; 534 conf.mac_addr = dev->dev_addr; 535 /* disable all keys for as long as this netdev is down */ 536 ieee80211_disable_keys(sdata); 537 local->ops->remove_interface(local_to_hw(local), &conf); 538 } 539 540 sdata->bss = NULL; 541 542 if (local->open_count == 0) { 543 if (netif_running(local->mdev)) 544 dev_close(local->mdev); 545 546 if (local->ops->stop) 547 local->ops->stop(local_to_hw(local)); 548 549 ieee80211_led_radio(local, 0); 550 551 flush_workqueue(local->hw.workqueue); 552 553 tasklet_disable(&local->tx_pending_tasklet); 554 tasklet_disable(&local->tasklet); 555 } 556 557 return 0; 558 } 559 560 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid) 561 { 562 struct ieee80211_local *local = hw_to_local(hw); 563 struct sta_info *sta; 564 struct ieee80211_sub_if_data *sdata; 565 u16 start_seq_num = 0; 566 u8 *state; 567 int ret; 568 DECLARE_MAC_BUF(mac); 569 570 if (tid >= STA_TID_NUM) 571 return -EINVAL; 572 573 #ifdef CONFIG_MAC80211_HT_DEBUG 574 printk(KERN_DEBUG "Open BA session requested for %s tid %u\n", 575 print_mac(mac, ra), tid); 576 #endif /* CONFIG_MAC80211_HT_DEBUG */ 577 578 rcu_read_lock(); 579 580 sta = sta_info_get(local, ra); 581 if (!sta) { 582 #ifdef CONFIG_MAC80211_HT_DEBUG 583 printk(KERN_DEBUG "Could not find the station\n"); 584 #endif 585 ret = -ENOENT; 586 goto exit; 587 } 588 589 spin_lock_bh(&sta->lock); 590 591 /* we have tried too many times, receiver does not want A-MPDU */ 592 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { 593 ret = -EBUSY; 594 goto err_unlock_sta; 595 } 596 597 state = &sta->ampdu_mlme.tid_state_tx[tid]; 598 /* check if the TID is not in aggregation flow already */ 599 if (*state != HT_AGG_STATE_IDLE) { 600 #ifdef CONFIG_MAC80211_HT_DEBUG 601 printk(KERN_DEBUG "BA request denied - session is not " 602 "idle on tid %u\n", tid); 603 #endif /* CONFIG_MAC80211_HT_DEBUG */ 604 ret = -EAGAIN; 605 goto err_unlock_sta; 606 } 607 608 /* prepare A-MPDU MLME for Tx aggregation */ 609 sta->ampdu_mlme.tid_tx[tid] = 610 kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); 611 if (!sta->ampdu_mlme.tid_tx[tid]) { 612 #ifdef CONFIG_MAC80211_HT_DEBUG 613 if (net_ratelimit()) 614 printk(KERN_ERR "allocate tx mlme to tid %d failed\n", 615 tid); 616 #endif 617 ret = -ENOMEM; 618 goto err_unlock_sta; 619 } 620 /* Tx timer */ 621 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function = 622 sta_addba_resp_timer_expired; 623 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data = 624 (unsigned long)&sta->timer_to_tid[tid]; 625 init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); 626 627 /* create a new queue for this aggregation */ 628 ret = ieee80211_ht_agg_queue_add(local, sta, tid); 629 630 /* case no queue is available to aggregation 631 * don't switch to aggregation */ 632 if (ret) { 633 #ifdef CONFIG_MAC80211_HT_DEBUG 634 printk(KERN_DEBUG "BA request denied - queue unavailable for" 635 " tid %d\n", tid); 636 #endif /* CONFIG_MAC80211_HT_DEBUG */ 637 goto err_unlock_queue; 638 } 639 sdata = sta->sdata; 640 641 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the 642 * call back right away, it must see that the flow has begun */ 643 *state |= HT_ADDBA_REQUESTED_MSK; 644 645 if (local->ops->ampdu_action) 646 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START, 647 ra, tid, &start_seq_num); 648 649 if (ret) { 650 /* No need to requeue the packets in the agg queue, since we 651 * held the tx lock: no packet could be enqueued to the newly 652 * allocated queue */ 653 ieee80211_ht_agg_queue_remove(local, sta, tid, 0); 654 #ifdef CONFIG_MAC80211_HT_DEBUG 655 printk(KERN_DEBUG "BA request denied - HW unavailable for" 656 " tid %d\n", tid); 657 #endif /* CONFIG_MAC80211_HT_DEBUG */ 658 *state = HT_AGG_STATE_IDLE; 659 goto err_unlock_queue; 660 } 661 662 /* Will put all the packets in the new SW queue */ 663 ieee80211_requeue(local, ieee802_1d_to_ac[tid]); 664 spin_unlock_bh(&sta->lock); 665 666 /* send an addBA request */ 667 sta->ampdu_mlme.dialog_token_allocator++; 668 sta->ampdu_mlme.tid_tx[tid]->dialog_token = 669 sta->ampdu_mlme.dialog_token_allocator; 670 sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num; 671 672 673 ieee80211_send_addba_request(sta->sdata->dev, ra, tid, 674 sta->ampdu_mlme.tid_tx[tid]->dialog_token, 675 sta->ampdu_mlme.tid_tx[tid]->ssn, 676 0x40, 5000); 677 /* activate the timer for the recipient's addBA response */ 678 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires = 679 jiffies + ADDBA_RESP_INTERVAL; 680 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); 681 #ifdef CONFIG_MAC80211_HT_DEBUG 682 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); 683 #endif 684 goto exit; 685 686 err_unlock_queue: 687 kfree(sta->ampdu_mlme.tid_tx[tid]); 688 sta->ampdu_mlme.tid_tx[tid] = NULL; 689 ret = -EBUSY; 690 err_unlock_sta: 691 spin_unlock_bh(&sta->lock); 692 exit: 693 rcu_read_unlock(); 694 return ret; 695 } 696 EXPORT_SYMBOL(ieee80211_start_tx_ba_session); 697 698 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw, 699 u8 *ra, u16 tid, 700 enum ieee80211_back_parties initiator) 701 { 702 struct ieee80211_local *local = hw_to_local(hw); 703 struct sta_info *sta; 704 u8 *state; 705 int ret = 0; 706 DECLARE_MAC_BUF(mac); 707 708 if (tid >= STA_TID_NUM) 709 return -EINVAL; 710 711 rcu_read_lock(); 712 sta = sta_info_get(local, ra); 713 if (!sta) { 714 rcu_read_unlock(); 715 return -ENOENT; 716 } 717 718 /* check if the TID is in aggregation */ 719 state = &sta->ampdu_mlme.tid_state_tx[tid]; 720 spin_lock_bh(&sta->lock); 721 722 if (*state != HT_AGG_STATE_OPERATIONAL) { 723 ret = -ENOENT; 724 goto stop_BA_exit; 725 } 726 727 #ifdef CONFIG_MAC80211_HT_DEBUG 728 printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n", 729 print_mac(mac, ra), tid); 730 #endif /* CONFIG_MAC80211_HT_DEBUG */ 731 732 ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]); 733 734 *state = HT_AGG_STATE_REQ_STOP_BA_MSK | 735 (initiator << HT_AGG_STATE_INITIATOR_SHIFT); 736 737 if (local->ops->ampdu_action) 738 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP, 739 ra, tid, NULL); 740 741 /* case HW denied going back to legacy */ 742 if (ret) { 743 WARN_ON(ret != -EBUSY); 744 *state = HT_AGG_STATE_OPERATIONAL; 745 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); 746 goto stop_BA_exit; 747 } 748 749 stop_BA_exit: 750 spin_unlock_bh(&sta->lock); 751 rcu_read_unlock(); 752 return ret; 753 } 754 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); 755 756 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid) 757 { 758 struct ieee80211_local *local = hw_to_local(hw); 759 struct sta_info *sta; 760 u8 *state; 761 DECLARE_MAC_BUF(mac); 762 763 if (tid >= STA_TID_NUM) { 764 #ifdef CONFIG_MAC80211_HT_DEBUG 765 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", 766 tid, STA_TID_NUM); 767 #endif 768 return; 769 } 770 771 rcu_read_lock(); 772 sta = sta_info_get(local, ra); 773 if (!sta) { 774 rcu_read_unlock(); 775 #ifdef CONFIG_MAC80211_HT_DEBUG 776 printk(KERN_DEBUG "Could not find station: %s\n", 777 print_mac(mac, ra)); 778 #endif 779 return; 780 } 781 782 state = &sta->ampdu_mlme.tid_state_tx[tid]; 783 spin_lock_bh(&sta->lock); 784 785 if (!(*state & HT_ADDBA_REQUESTED_MSK)) { 786 #ifdef CONFIG_MAC80211_HT_DEBUG 787 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n", 788 *state); 789 #endif 790 spin_unlock_bh(&sta->lock); 791 rcu_read_unlock(); 792 return; 793 } 794 795 WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK); 796 797 *state |= HT_ADDBA_DRV_READY_MSK; 798 799 if (*state == HT_AGG_STATE_OPERATIONAL) { 800 #ifdef CONFIG_MAC80211_HT_DEBUG 801 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid); 802 #endif 803 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); 804 } 805 spin_unlock_bh(&sta->lock); 806 rcu_read_unlock(); 807 } 808 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb); 809 810 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid) 811 { 812 struct ieee80211_local *local = hw_to_local(hw); 813 struct sta_info *sta; 814 u8 *state; 815 int agg_queue; 816 DECLARE_MAC_BUF(mac); 817 818 if (tid >= STA_TID_NUM) { 819 #ifdef CONFIG_MAC80211_HT_DEBUG 820 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", 821 tid, STA_TID_NUM); 822 #endif 823 return; 824 } 825 826 #ifdef CONFIG_MAC80211_HT_DEBUG 827 printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n", 828 print_mac(mac, ra), tid); 829 #endif /* CONFIG_MAC80211_HT_DEBUG */ 830 831 rcu_read_lock(); 832 sta = sta_info_get(local, ra); 833 if (!sta) { 834 #ifdef CONFIG_MAC80211_HT_DEBUG 835 printk(KERN_DEBUG "Could not find station: %s\n", 836 print_mac(mac, ra)); 837 #endif 838 rcu_read_unlock(); 839 return; 840 } 841 state = &sta->ampdu_mlme.tid_state_tx[tid]; 842 843 /* NOTE: no need to use sta->lock in this state check, as 844 * ieee80211_stop_tx_ba_session will let only one stop call to 845 * pass through per sta/tid 846 */ 847 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) { 848 #ifdef CONFIG_MAC80211_HT_DEBUG 849 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); 850 #endif 851 rcu_read_unlock(); 852 return; 853 } 854 855 if (*state & HT_AGG_STATE_INITIATOR_MSK) 856 ieee80211_send_delba(sta->sdata->dev, ra, tid, 857 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); 858 859 agg_queue = sta->tid_to_tx_q[tid]; 860 861 ieee80211_ht_agg_queue_remove(local, sta, tid, 1); 862 863 /* We just requeued the all the frames that were in the 864 * removed queue, and since we might miss a softirq we do 865 * netif_schedule_queue. ieee80211_wake_queue is not used 866 * here as this queue is not necessarily stopped 867 */ 868 netif_schedule_queue(netdev_get_tx_queue(local->mdev, agg_queue)); 869 spin_lock_bh(&sta->lock); 870 *state = HT_AGG_STATE_IDLE; 871 sta->ampdu_mlme.addba_req_num[tid] = 0; 872 kfree(sta->ampdu_mlme.tid_tx[tid]); 873 sta->ampdu_mlme.tid_tx[tid] = NULL; 874 spin_unlock_bh(&sta->lock); 875 876 rcu_read_unlock(); 877 } 878 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb); 879 880 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, 881 const u8 *ra, u16 tid) 882 { 883 struct ieee80211_local *local = hw_to_local(hw); 884 struct ieee80211_ra_tid *ra_tid; 885 struct sk_buff *skb = dev_alloc_skb(0); 886 887 if (unlikely(!skb)) { 888 #ifdef CONFIG_MAC80211_HT_DEBUG 889 if (net_ratelimit()) 890 printk(KERN_WARNING "%s: Not enough memory, " 891 "dropping start BA session", skb->dev->name); 892 #endif 893 return; 894 } 895 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 896 memcpy(&ra_tid->ra, ra, ETH_ALEN); 897 ra_tid->tid = tid; 898 899 skb->pkt_type = IEEE80211_ADDBA_MSG; 900 skb_queue_tail(&local->skb_queue, skb); 901 tasklet_schedule(&local->tasklet); 902 } 903 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); 904 905 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, 906 const u8 *ra, u16 tid) 907 { 908 struct ieee80211_local *local = hw_to_local(hw); 909 struct ieee80211_ra_tid *ra_tid; 910 struct sk_buff *skb = dev_alloc_skb(0); 911 912 if (unlikely(!skb)) { 913 #ifdef CONFIG_MAC80211_HT_DEBUG 914 if (net_ratelimit()) 915 printk(KERN_WARNING "%s: Not enough memory, " 916 "dropping stop BA session", skb->dev->name); 917 #endif 918 return; 919 } 920 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 921 memcpy(&ra_tid->ra, ra, ETH_ALEN); 922 ra_tid->tid = tid; 923 924 skb->pkt_type = IEEE80211_DELBA_MSG; 925 skb_queue_tail(&local->skb_queue, skb); 926 tasklet_schedule(&local->tasklet); 927 } 928 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); 929 930 static void ieee80211_set_multicast_list(struct net_device *dev) 931 { 932 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 933 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 934 int allmulti, promisc, sdata_allmulti, sdata_promisc; 935 936 allmulti = !!(dev->flags & IFF_ALLMULTI); 937 promisc = !!(dev->flags & IFF_PROMISC); 938 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 939 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); 940 941 if (allmulti != sdata_allmulti) { 942 if (dev->flags & IFF_ALLMULTI) 943 atomic_inc(&local->iff_allmultis); 944 else 945 atomic_dec(&local->iff_allmultis); 946 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 947 } 948 949 if (promisc != sdata_promisc) { 950 if (dev->flags & IFF_PROMISC) 951 atomic_inc(&local->iff_promiscs); 952 else 953 atomic_dec(&local->iff_promiscs); 954 sdata->flags ^= IEEE80211_SDATA_PROMISC; 955 } 956 957 dev_mc_sync(local->mdev, dev); 958 } 959 960 static const struct header_ops ieee80211_header_ops = { 961 .create = eth_header, 962 .parse = header_parse_80211, 963 .rebuild = eth_rebuild_header, 964 .cache = eth_header_cache, 965 .cache_update = eth_header_cache_update, 966 }; 967 968 void ieee80211_if_setup(struct net_device *dev) 969 { 970 ether_setup(dev); 971 dev->hard_start_xmit = ieee80211_subif_start_xmit; 972 dev->wireless_handlers = &ieee80211_iw_handler_def; 973 dev->set_multicast_list = ieee80211_set_multicast_list; 974 dev->change_mtu = ieee80211_change_mtu; 975 dev->open = ieee80211_open; 976 dev->stop = ieee80211_stop; 977 dev->destructor = free_netdev; 978 } 979 980 /* everything else */ 981 982 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed) 983 { 984 struct ieee80211_local *local = sdata->local; 985 struct ieee80211_if_conf conf; 986 987 if (WARN_ON(!netif_running(sdata->dev))) 988 return 0; 989 990 if (!local->ops->config_interface) 991 return 0; 992 993 memset(&conf, 0, sizeof(conf)); 994 conf.changed = changed; 995 996 if (sdata->vif.type == IEEE80211_IF_TYPE_STA || 997 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) { 998 conf.bssid = sdata->u.sta.bssid; 999 conf.ssid = sdata->u.sta.ssid; 1000 conf.ssid_len = sdata->u.sta.ssid_len; 1001 } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) { 1002 conf.bssid = sdata->dev->dev_addr; 1003 conf.ssid = sdata->u.ap.ssid; 1004 conf.ssid_len = sdata->u.ap.ssid_len; 1005 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 1006 u8 zero[ETH_ALEN] = { 0 }; 1007 conf.bssid = zero; 1008 conf.ssid = zero; 1009 conf.ssid_len = 0; 1010 } else { 1011 WARN_ON(1); 1012 return -EINVAL; 1013 } 1014 1015 if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID))) 1016 return -EINVAL; 1017 1018 if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID))) 1019 return -EINVAL; 1020 1021 return local->ops->config_interface(local_to_hw(local), 1022 &sdata->vif, &conf); 1023 } 1024 1025 int ieee80211_hw_config(struct ieee80211_local *local) 1026 { 1027 struct ieee80211_channel *chan; 1028 int ret = 0; 1029 1030 if (local->sta_sw_scanning) 1031 chan = local->scan_channel; 1032 else 1033 chan = local->oper_channel; 1034 1035 local->hw.conf.channel = chan; 1036 1037 if (!local->hw.conf.power_level) 1038 local->hw.conf.power_level = chan->max_power; 1039 else 1040 local->hw.conf.power_level = min(chan->max_power, 1041 local->hw.conf.power_level); 1042 1043 local->hw.conf.max_antenna_gain = chan->max_antenna_gain; 1044 1045 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1046 printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n", 1047 wiphy_name(local->hw.wiphy), chan->center_freq); 1048 #endif 1049 1050 if (local->open_count) 1051 ret = local->ops->config(local_to_hw(local), &local->hw.conf); 1052 1053 return ret; 1054 } 1055 1056 /** 1057 * ieee80211_handle_ht should be used only after legacy configuration 1058 * has been determined namely band, as ht configuration depends upon 1059 * the hardware's HT abilities for a _specific_ band. 1060 */ 1061 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht, 1062 struct ieee80211_ht_info *req_ht_cap, 1063 struct ieee80211_ht_bss_info *req_bss_cap) 1064 { 1065 struct ieee80211_conf *conf = &local->hw.conf; 1066 struct ieee80211_supported_band *sband; 1067 struct ieee80211_ht_info ht_conf; 1068 struct ieee80211_ht_bss_info ht_bss_conf; 1069 u32 changed = 0; 1070 int i; 1071 u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS; 1072 u8 tx_mcs_set_cap; 1073 1074 sband = local->hw.wiphy->bands[conf->channel->band]; 1075 1076 memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info)); 1077 memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info)); 1078 1079 /* HT is not supported */ 1080 if (!sband->ht_info.ht_supported) { 1081 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE; 1082 goto out; 1083 } 1084 1085 /* disable HT */ 1086 if (!enable_ht) { 1087 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) 1088 changed |= BSS_CHANGED_HT; 1089 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE; 1090 conf->ht_conf.ht_supported = 0; 1091 goto out; 1092 } 1093 1094 1095 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) 1096 changed |= BSS_CHANGED_HT; 1097 1098 conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE; 1099 ht_conf.ht_supported = 1; 1100 1101 ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap; 1102 ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS); 1103 ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS; 1104 ht_bss_conf.primary_channel = req_bss_cap->primary_channel; 1105 ht_bss_conf.bss_cap = req_bss_cap->bss_cap; 1106 ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode; 1107 1108 ht_conf.ampdu_factor = req_ht_cap->ampdu_factor; 1109 ht_conf.ampdu_density = req_ht_cap->ampdu_density; 1110 1111 /* Bits 96-100 */ 1112 tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12]; 1113 1114 /* configure suppoerted Tx MCS according to requested MCS 1115 * (based in most cases on Rx capabilities of peer) and self 1116 * Tx MCS capabilities (as defined by low level driver HW 1117 * Tx capabilities) */ 1118 if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED)) 1119 goto check_changed; 1120 1121 /* Counting from 0 therfore + 1 */ 1122 if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF) 1123 max_tx_streams = ((tx_mcs_set_cap & 1124 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1; 1125 1126 for (i = 0; i < max_tx_streams; i++) 1127 ht_conf.supp_mcs_set[i] = 1128 sband->ht_info.supp_mcs_set[i] & 1129 req_ht_cap->supp_mcs_set[i]; 1130 1131 if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM) 1132 for (i = IEEE80211_SUPP_MCS_SET_UEQM; 1133 i < IEEE80211_SUPP_MCS_SET_LEN; i++) 1134 ht_conf.supp_mcs_set[i] = 1135 sband->ht_info.supp_mcs_set[i] & 1136 req_ht_cap->supp_mcs_set[i]; 1137 1138 check_changed: 1139 /* if bss configuration changed store the new one */ 1140 if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) || 1141 memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) { 1142 changed |= BSS_CHANGED_HT; 1143 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf)); 1144 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf)); 1145 } 1146 out: 1147 return changed; 1148 } 1149 1150 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 1151 u32 changed) 1152 { 1153 struct ieee80211_local *local = sdata->local; 1154 1155 if (!changed) 1156 return; 1157 1158 if (local->ops->bss_info_changed) 1159 local->ops->bss_info_changed(local_to_hw(local), 1160 &sdata->vif, 1161 &sdata->bss_conf, 1162 changed); 1163 } 1164 1165 u32 ieee80211_reset_erp_info(struct net_device *dev) 1166 { 1167 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1168 1169 sdata->bss_conf.use_cts_prot = 0; 1170 sdata->bss_conf.use_short_preamble = 0; 1171 return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE; 1172 } 1173 1174 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, 1175 struct sk_buff *skb) 1176 { 1177 struct ieee80211_local *local = hw_to_local(hw); 1178 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1179 int tmp; 1180 1181 skb->dev = local->mdev; 1182 skb->pkt_type = IEEE80211_TX_STATUS_MSG; 1183 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ? 1184 &local->skb_queue : &local->skb_queue_unreliable, skb); 1185 tmp = skb_queue_len(&local->skb_queue) + 1186 skb_queue_len(&local->skb_queue_unreliable); 1187 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && 1188 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 1189 dev_kfree_skb_irq(skb); 1190 tmp--; 1191 I802_DEBUG_INC(local->tx_status_drop); 1192 } 1193 tasklet_schedule(&local->tasklet); 1194 } 1195 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); 1196 1197 static void ieee80211_tasklet_handler(unsigned long data) 1198 { 1199 struct ieee80211_local *local = (struct ieee80211_local *) data; 1200 struct sk_buff *skb; 1201 struct ieee80211_rx_status rx_status; 1202 struct ieee80211_ra_tid *ra_tid; 1203 1204 while ((skb = skb_dequeue(&local->skb_queue)) || 1205 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 1206 switch (skb->pkt_type) { 1207 case IEEE80211_RX_MSG: 1208 /* status is in skb->cb */ 1209 memcpy(&rx_status, skb->cb, sizeof(rx_status)); 1210 /* Clear skb->pkt_type in order to not confuse kernel 1211 * netstack. */ 1212 skb->pkt_type = 0; 1213 __ieee80211_rx(local_to_hw(local), skb, &rx_status); 1214 break; 1215 case IEEE80211_TX_STATUS_MSG: 1216 skb->pkt_type = 0; 1217 ieee80211_tx_status(local_to_hw(local), skb); 1218 break; 1219 case IEEE80211_DELBA_MSG: 1220 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 1221 ieee80211_stop_tx_ba_cb(local_to_hw(local), 1222 ra_tid->ra, ra_tid->tid); 1223 dev_kfree_skb(skb); 1224 break; 1225 case IEEE80211_ADDBA_MSG: 1226 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 1227 ieee80211_start_tx_ba_cb(local_to_hw(local), 1228 ra_tid->ra, ra_tid->tid); 1229 dev_kfree_skb(skb); 1230 break ; 1231 default: 1232 WARN_ON(1); 1233 dev_kfree_skb(skb); 1234 break; 1235 } 1236 } 1237 } 1238 1239 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to 1240 * make a prepared TX frame (one that has been given to hw) to look like brand 1241 * new IEEE 802.11 frame that is ready to go through TX processing again. 1242 */ 1243 static void ieee80211_remove_tx_extra(struct ieee80211_local *local, 1244 struct ieee80211_key *key, 1245 struct sk_buff *skb) 1246 { 1247 int hdrlen, iv_len, mic_len; 1248 1249 hdrlen = ieee80211_get_hdrlen_from_skb(skb); 1250 1251 if (!key) 1252 goto no_key; 1253 1254 switch (key->conf.alg) { 1255 case ALG_WEP: 1256 iv_len = WEP_IV_LEN; 1257 mic_len = WEP_ICV_LEN; 1258 break; 1259 case ALG_TKIP: 1260 iv_len = TKIP_IV_LEN; 1261 mic_len = TKIP_ICV_LEN; 1262 break; 1263 case ALG_CCMP: 1264 iv_len = CCMP_HDR_LEN; 1265 mic_len = CCMP_MIC_LEN; 1266 break; 1267 default: 1268 goto no_key; 1269 } 1270 1271 if (skb->len >= mic_len && 1272 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 1273 skb_trim(skb, skb->len - mic_len); 1274 if (skb->len >= iv_len && skb->len > hdrlen) { 1275 memmove(skb->data + iv_len, skb->data, hdrlen); 1276 skb_pull(skb, iv_len); 1277 } 1278 1279 no_key: 1280 { 1281 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1282 u16 fc = le16_to_cpu(hdr->frame_control); 1283 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ { 1284 fc &= ~IEEE80211_STYPE_QOS_DATA; 1285 hdr->frame_control = cpu_to_le16(fc); 1286 memmove(skb->data + 2, skb->data, hdrlen - 2); 1287 skb_pull(skb, 2); 1288 } 1289 } 1290 } 1291 1292 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, 1293 struct sta_info *sta, 1294 struct sk_buff *skb) 1295 { 1296 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1297 1298 sta->tx_filtered_count++; 1299 1300 /* 1301 * Clear the TX filter mask for this STA when sending the next 1302 * packet. If the STA went to power save mode, this will happen 1303 * when it wakes up for the next time. 1304 */ 1305 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT); 1306 1307 /* 1308 * This code races in the following way: 1309 * 1310 * (1) STA sends frame indicating it will go to sleep and does so 1311 * (2) hardware/firmware adds STA to filter list, passes frame up 1312 * (3) hardware/firmware processes TX fifo and suppresses a frame 1313 * (4) we get TX status before having processed the frame and 1314 * knowing that the STA has gone to sleep. 1315 * 1316 * This is actually quite unlikely even when both those events are 1317 * processed from interrupts coming in quickly after one another or 1318 * even at the same time because we queue both TX status events and 1319 * RX frames to be processed by a tasklet and process them in the 1320 * same order that they were received or TX status last. Hence, there 1321 * is no race as long as the frame RX is processed before the next TX 1322 * status, which drivers can ensure, see below. 1323 * 1324 * Note that this can only happen if the hardware or firmware can 1325 * actually add STAs to the filter list, if this is done by the 1326 * driver in response to set_tim() (which will only reduce the race 1327 * this whole filtering tries to solve, not completely solve it) 1328 * this situation cannot happen. 1329 * 1330 * To completely solve this race drivers need to make sure that they 1331 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 1332 * functions and 1333 * (b) always process RX events before TX status events if ordering 1334 * can be unknown, for example with different interrupt status 1335 * bits. 1336 */ 1337 if (test_sta_flags(sta, WLAN_STA_PS) && 1338 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) { 1339 ieee80211_remove_tx_extra(local, sta->key, skb); 1340 skb_queue_tail(&sta->tx_filtered, skb); 1341 return; 1342 } 1343 1344 if (!test_sta_flags(sta, WLAN_STA_PS) && 1345 !(info->flags & IEEE80211_TX_CTL_REQUEUE)) { 1346 /* Software retry the packet once */ 1347 info->flags |= IEEE80211_TX_CTL_REQUEUE; 1348 ieee80211_remove_tx_extra(local, sta->key, skb); 1349 dev_queue_xmit(skb); 1350 return; 1351 } 1352 1353 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1354 if (net_ratelimit()) 1355 printk(KERN_DEBUG "%s: dropped TX filtered frame, " 1356 "queue_len=%d PS=%d @%lu\n", 1357 wiphy_name(local->hw.wiphy), 1358 skb_queue_len(&sta->tx_filtered), 1359 !!test_sta_flags(sta, WLAN_STA_PS), jiffies); 1360 #endif 1361 dev_kfree_skb(skb); 1362 } 1363 1364 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 1365 { 1366 struct sk_buff *skb2; 1367 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1368 struct ieee80211_local *local = hw_to_local(hw); 1369 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1370 u16 frag, type; 1371 __le16 fc; 1372 struct ieee80211_tx_status_rtap_hdr *rthdr; 1373 struct ieee80211_sub_if_data *sdata; 1374 struct net_device *prev_dev = NULL; 1375 struct sta_info *sta; 1376 1377 rcu_read_lock(); 1378 1379 if (info->status.excessive_retries) { 1380 sta = sta_info_get(local, hdr->addr1); 1381 if (sta) { 1382 if (test_sta_flags(sta, WLAN_STA_PS)) { 1383 /* 1384 * The STA is in power save mode, so assume 1385 * that this TX packet failed because of that. 1386 */ 1387 ieee80211_handle_filtered_frame(local, sta, skb); 1388 rcu_read_unlock(); 1389 return; 1390 } 1391 } 1392 } 1393 1394 fc = hdr->frame_control; 1395 1396 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 1397 (ieee80211_is_data_qos(fc))) { 1398 u16 tid, ssn; 1399 u8 *qc; 1400 sta = sta_info_get(local, hdr->addr1); 1401 if (sta) { 1402 qc = ieee80211_get_qos_ctl(hdr); 1403 tid = qc[0] & 0xf; 1404 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 1405 & IEEE80211_SCTL_SEQ); 1406 ieee80211_send_bar(sta->sdata->dev, hdr->addr1, 1407 tid, ssn); 1408 } 1409 } 1410 1411 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 1412 sta = sta_info_get(local, hdr->addr1); 1413 if (sta) { 1414 ieee80211_handle_filtered_frame(local, sta, skb); 1415 rcu_read_unlock(); 1416 return; 1417 } 1418 } else 1419 rate_control_tx_status(local->mdev, skb); 1420 1421 rcu_read_unlock(); 1422 1423 ieee80211_led_tx(local, 0); 1424 1425 /* SNMP counters 1426 * Fragments are passed to low-level drivers as separate skbs, so these 1427 * are actually fragments, not frames. Update frame counters only for 1428 * the first fragment of the frame. */ 1429 1430 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG; 1431 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE; 1432 1433 if (info->flags & IEEE80211_TX_STAT_ACK) { 1434 if (frag == 0) { 1435 local->dot11TransmittedFrameCount++; 1436 if (is_multicast_ether_addr(hdr->addr1)) 1437 local->dot11MulticastTransmittedFrameCount++; 1438 if (info->status.retry_count > 0) 1439 local->dot11RetryCount++; 1440 if (info->status.retry_count > 1) 1441 local->dot11MultipleRetryCount++; 1442 } 1443 1444 /* This counter shall be incremented for an acknowledged MPDU 1445 * with an individual address in the address 1 field or an MPDU 1446 * with a multicast address in the address 1 field of type Data 1447 * or Management. */ 1448 if (!is_multicast_ether_addr(hdr->addr1) || 1449 type == IEEE80211_FTYPE_DATA || 1450 type == IEEE80211_FTYPE_MGMT) 1451 local->dot11TransmittedFragmentCount++; 1452 } else { 1453 if (frag == 0) 1454 local->dot11FailedCount++; 1455 } 1456 1457 /* this was a transmitted frame, but now we want to reuse it */ 1458 skb_orphan(skb); 1459 1460 /* 1461 * This is a bit racy but we can avoid a lot of work 1462 * with this test... 1463 */ 1464 if (!local->monitors && !local->cooked_mntrs) { 1465 dev_kfree_skb(skb); 1466 return; 1467 } 1468 1469 /* send frame to monitor interfaces now */ 1470 1471 if (skb_headroom(skb) < sizeof(*rthdr)) { 1472 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n"); 1473 dev_kfree_skb(skb); 1474 return; 1475 } 1476 1477 rthdr = (struct ieee80211_tx_status_rtap_hdr *) 1478 skb_push(skb, sizeof(*rthdr)); 1479 1480 memset(rthdr, 0, sizeof(*rthdr)); 1481 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); 1482 rthdr->hdr.it_present = 1483 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 1484 (1 << IEEE80211_RADIOTAP_DATA_RETRIES)); 1485 1486 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 1487 !is_multicast_ether_addr(hdr->addr1)) 1488 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL); 1489 1490 if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) && 1491 (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) 1492 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS); 1493 else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) 1494 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS); 1495 1496 rthdr->data_retries = info->status.retry_count; 1497 1498 /* XXX: is this sufficient for BPF? */ 1499 skb_set_mac_header(skb, 0); 1500 skb->ip_summed = CHECKSUM_UNNECESSARY; 1501 skb->pkt_type = PACKET_OTHERHOST; 1502 skb->protocol = htons(ETH_P_802_2); 1503 memset(skb->cb, 0, sizeof(skb->cb)); 1504 1505 rcu_read_lock(); 1506 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 1507 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) { 1508 if (!netif_running(sdata->dev)) 1509 continue; 1510 1511 if (prev_dev) { 1512 skb2 = skb_clone(skb, GFP_ATOMIC); 1513 if (skb2) { 1514 skb2->dev = prev_dev; 1515 netif_rx(skb2); 1516 } 1517 } 1518 1519 prev_dev = sdata->dev; 1520 } 1521 } 1522 if (prev_dev) { 1523 skb->dev = prev_dev; 1524 netif_rx(skb); 1525 skb = NULL; 1526 } 1527 rcu_read_unlock(); 1528 dev_kfree_skb(skb); 1529 } 1530 EXPORT_SYMBOL(ieee80211_tx_status); 1531 1532 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 1533 const struct ieee80211_ops *ops) 1534 { 1535 struct ieee80211_local *local; 1536 int priv_size; 1537 struct wiphy *wiphy; 1538 1539 /* Ensure 32-byte alignment of our private data and hw private data. 1540 * We use the wiphy priv data for both our ieee80211_local and for 1541 * the driver's private data 1542 * 1543 * In memory it'll be like this: 1544 * 1545 * +-------------------------+ 1546 * | struct wiphy | 1547 * +-------------------------+ 1548 * | struct ieee80211_local | 1549 * +-------------------------+ 1550 * | driver's private data | 1551 * +-------------------------+ 1552 * 1553 */ 1554 priv_size = ((sizeof(struct ieee80211_local) + 1555 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) + 1556 priv_data_len; 1557 1558 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 1559 1560 if (!wiphy) 1561 return NULL; 1562 1563 wiphy->privid = mac80211_wiphy_privid; 1564 1565 local = wiphy_priv(wiphy); 1566 local->hw.wiphy = wiphy; 1567 1568 local->hw.priv = (char *)local + 1569 ((sizeof(struct ieee80211_local) + 1570 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST); 1571 1572 BUG_ON(!ops->tx); 1573 BUG_ON(!ops->start); 1574 BUG_ON(!ops->stop); 1575 BUG_ON(!ops->config); 1576 BUG_ON(!ops->add_interface); 1577 BUG_ON(!ops->remove_interface); 1578 BUG_ON(!ops->configure_filter); 1579 local->ops = ops; 1580 1581 local->hw.queues = 1; /* default */ 1582 1583 local->bridge_packets = 1; 1584 1585 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD; 1586 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD; 1587 local->short_retry_limit = 7; 1588 local->long_retry_limit = 4; 1589 local->hw.conf.radio_enabled = 1; 1590 1591 INIT_LIST_HEAD(&local->interfaces); 1592 1593 spin_lock_init(&local->key_lock); 1594 1595 INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work); 1596 1597 sta_info_init(local); 1598 1599 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 1600 (unsigned long)local); 1601 tasklet_disable(&local->tx_pending_tasklet); 1602 1603 tasklet_init(&local->tasklet, 1604 ieee80211_tasklet_handler, 1605 (unsigned long) local); 1606 tasklet_disable(&local->tasklet); 1607 1608 skb_queue_head_init(&local->skb_queue); 1609 skb_queue_head_init(&local->skb_queue_unreliable); 1610 1611 return local_to_hw(local); 1612 } 1613 EXPORT_SYMBOL(ieee80211_alloc_hw); 1614 1615 int ieee80211_register_hw(struct ieee80211_hw *hw) 1616 { 1617 struct ieee80211_local *local = hw_to_local(hw); 1618 const char *name; 1619 int result; 1620 enum ieee80211_band band; 1621 struct net_device *mdev; 1622 struct wireless_dev *mwdev; 1623 1624 /* 1625 * generic code guarantees at least one band, 1626 * set this very early because much code assumes 1627 * that hw.conf.channel is assigned 1628 */ 1629 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1630 struct ieee80211_supported_band *sband; 1631 1632 sband = local->hw.wiphy->bands[band]; 1633 if (sband) { 1634 /* init channel we're on */ 1635 local->hw.conf.channel = 1636 local->oper_channel = 1637 local->scan_channel = &sband->channels[0]; 1638 break; 1639 } 1640 } 1641 1642 result = wiphy_register(local->hw.wiphy); 1643 if (result < 0) 1644 return result; 1645 1646 /* 1647 * We use the number of queues for feature tests (QoS, HT) internally 1648 * so restrict them appropriately. 1649 */ 1650 if (hw->queues > IEEE80211_MAX_QUEUES) 1651 hw->queues = IEEE80211_MAX_QUEUES; 1652 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES) 1653 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES; 1654 if (hw->queues < 4) 1655 hw->ampdu_queues = 0; 1656 1657 mdev = alloc_netdev_mq(sizeof(struct wireless_dev), 1658 "wmaster%d", ether_setup, 1659 ieee80211_num_queues(hw)); 1660 if (!mdev) 1661 goto fail_mdev_alloc; 1662 1663 mwdev = netdev_priv(mdev); 1664 mdev->ieee80211_ptr = mwdev; 1665 mwdev->wiphy = local->hw.wiphy; 1666 1667 local->mdev = mdev; 1668 1669 ieee80211_rx_bss_list_init(local); 1670 1671 mdev->hard_start_xmit = ieee80211_master_start_xmit; 1672 mdev->open = ieee80211_master_open; 1673 mdev->stop = ieee80211_master_stop; 1674 mdev->type = ARPHRD_IEEE80211; 1675 mdev->header_ops = &ieee80211_header_ops; 1676 mdev->set_multicast_list = ieee80211_master_set_multicast_list; 1677 1678 name = wiphy_dev(local->hw.wiphy)->driver->name; 1679 local->hw.workqueue = create_freezeable_workqueue(name); 1680 if (!local->hw.workqueue) { 1681 result = -ENOMEM; 1682 goto fail_workqueue; 1683 } 1684 1685 /* 1686 * The hardware needs headroom for sending the frame, 1687 * and we need some headroom for passing the frame to monitor 1688 * interfaces, but never both at the same time. 1689 */ 1690 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 1691 sizeof(struct ieee80211_tx_status_rtap_hdr)); 1692 1693 debugfs_hw_add(local); 1694 1695 if (local->hw.conf.beacon_int < 10) 1696 local->hw.conf.beacon_int = 100; 1697 1698 if (local->hw.max_listen_interval == 0) 1699 local->hw.max_listen_interval = 1; 1700 1701 local->hw.conf.listen_interval = local->hw.max_listen_interval; 1702 1703 local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC | 1704 IEEE80211_HW_SIGNAL_DB | 1705 IEEE80211_HW_SIGNAL_DBM) ? 1706 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID; 1707 local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ? 1708 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID; 1709 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 1710 local->wstats_flags |= IW_QUAL_DBM; 1711 1712 result = sta_info_start(local); 1713 if (result < 0) 1714 goto fail_sta_info; 1715 1716 rtnl_lock(); 1717 result = dev_alloc_name(local->mdev, local->mdev->name); 1718 if (result < 0) 1719 goto fail_dev; 1720 1721 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1722 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy)); 1723 1724 result = register_netdevice(local->mdev); 1725 if (result < 0) 1726 goto fail_dev; 1727 1728 result = ieee80211_init_rate_ctrl_alg(local, 1729 hw->rate_control_algorithm); 1730 if (result < 0) { 1731 printk(KERN_DEBUG "%s: Failed to initialize rate control " 1732 "algorithm\n", wiphy_name(local->hw.wiphy)); 1733 goto fail_rate; 1734 } 1735 1736 result = ieee80211_wep_init(local); 1737 1738 if (result < 0) { 1739 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n", 1740 wiphy_name(local->hw.wiphy), result); 1741 goto fail_wep; 1742 } 1743 1744 local->mdev->select_queue = ieee80211_select_queue; 1745 1746 /* add one default STA interface */ 1747 result = ieee80211_if_add(local, "wlan%d", NULL, 1748 IEEE80211_IF_TYPE_STA, NULL); 1749 if (result) 1750 printk(KERN_WARNING "%s: Failed to add default virtual iface\n", 1751 wiphy_name(local->hw.wiphy)); 1752 1753 rtnl_unlock(); 1754 1755 ieee80211_led_init(local); 1756 1757 return 0; 1758 1759 fail_wep: 1760 rate_control_deinitialize(local); 1761 fail_rate: 1762 unregister_netdevice(local->mdev); 1763 local->mdev = NULL; 1764 fail_dev: 1765 rtnl_unlock(); 1766 sta_info_stop(local); 1767 fail_sta_info: 1768 debugfs_hw_del(local); 1769 destroy_workqueue(local->hw.workqueue); 1770 fail_workqueue: 1771 if (local->mdev) 1772 free_netdev(local->mdev); 1773 fail_mdev_alloc: 1774 wiphy_unregister(local->hw.wiphy); 1775 return result; 1776 } 1777 EXPORT_SYMBOL(ieee80211_register_hw); 1778 1779 void ieee80211_unregister_hw(struct ieee80211_hw *hw) 1780 { 1781 struct ieee80211_local *local = hw_to_local(hw); 1782 1783 tasklet_kill(&local->tx_pending_tasklet); 1784 tasklet_kill(&local->tasklet); 1785 1786 rtnl_lock(); 1787 1788 /* 1789 * At this point, interface list manipulations are fine 1790 * because the driver cannot be handing us frames any 1791 * more and the tasklet is killed. 1792 */ 1793 1794 /* First, we remove all virtual interfaces. */ 1795 ieee80211_remove_interfaces(local); 1796 1797 /* then, finally, remove the master interface */ 1798 unregister_netdevice(local->mdev); 1799 1800 rtnl_unlock(); 1801 1802 ieee80211_rx_bss_list_deinit(local); 1803 ieee80211_clear_tx_pending(local); 1804 sta_info_stop(local); 1805 rate_control_deinitialize(local); 1806 debugfs_hw_del(local); 1807 1808 if (skb_queue_len(&local->skb_queue) 1809 || skb_queue_len(&local->skb_queue_unreliable)) 1810 printk(KERN_WARNING "%s: skb_queue not empty\n", 1811 wiphy_name(local->hw.wiphy)); 1812 skb_queue_purge(&local->skb_queue); 1813 skb_queue_purge(&local->skb_queue_unreliable); 1814 1815 destroy_workqueue(local->hw.workqueue); 1816 wiphy_unregister(local->hw.wiphy); 1817 ieee80211_wep_free(local); 1818 ieee80211_led_exit(local); 1819 free_netdev(local->mdev); 1820 } 1821 EXPORT_SYMBOL(ieee80211_unregister_hw); 1822 1823 void ieee80211_free_hw(struct ieee80211_hw *hw) 1824 { 1825 struct ieee80211_local *local = hw_to_local(hw); 1826 1827 wiphy_free(local->hw.wiphy); 1828 } 1829 EXPORT_SYMBOL(ieee80211_free_hw); 1830 1831 static int __init ieee80211_init(void) 1832 { 1833 struct sk_buff *skb; 1834 int ret; 1835 1836 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1837 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1838 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1839 1840 ret = rc80211_pid_init(); 1841 if (ret) 1842 return ret; 1843 1844 ieee80211_debugfs_netdev_init(); 1845 1846 return 0; 1847 } 1848 1849 static void __exit ieee80211_exit(void) 1850 { 1851 rc80211_pid_exit(); 1852 1853 /* 1854 * For key todo, it'll be empty by now but the work 1855 * might still be scheduled. 1856 */ 1857 flush_scheduled_work(); 1858 1859 if (mesh_allocated) 1860 ieee80211s_stop(); 1861 1862 ieee80211_debugfs_netdev_exit(); 1863 } 1864 1865 1866 subsys_initcall(ieee80211_init); 1867 module_exit(ieee80211_exit); 1868 1869 MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1870 MODULE_LICENSE("GPL"); 1871