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