main.c revision b9e40857682ecfc5bcd0356a23ff409883ffb982
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 */ 42struct 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 50static 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 */ 57static 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 100static 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_start_queue(local->mdev); 118 119 return 0; 120} 121 122static 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 135static 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 144static 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 165static 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 181static 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_start_queue(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 393static 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_stop_queue(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 554int 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 netdev_queue *txq; 558 struct sta_info *sta; 559 struct ieee80211_sub_if_data *sdata; 560 u16 start_seq_num = 0; 561 u8 *state; 562 int ret; 563 DECLARE_MAC_BUF(mac); 564 565 if (tid >= STA_TID_NUM) 566 return -EINVAL; 567 568#ifdef CONFIG_MAC80211_HT_DEBUG 569 printk(KERN_DEBUG "Open BA session requested for %s tid %u\n", 570 print_mac(mac, ra), tid); 571#endif /* CONFIG_MAC80211_HT_DEBUG */ 572 573 rcu_read_lock(); 574 575 sta = sta_info_get(local, ra); 576 if (!sta) { 577#ifdef CONFIG_MAC80211_HT_DEBUG 578 printk(KERN_DEBUG "Could not find the station\n"); 579#endif 580 ret = -ENOENT; 581 goto exit; 582 } 583 584 spin_lock_bh(&sta->lock); 585 586 /* we have tried too many times, receiver does not want A-MPDU */ 587 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { 588 ret = -EBUSY; 589 goto err_unlock_sta; 590 } 591 592 state = &sta->ampdu_mlme.tid_state_tx[tid]; 593 /* check if the TID is not in aggregation flow already */ 594 if (*state != HT_AGG_STATE_IDLE) { 595#ifdef CONFIG_MAC80211_HT_DEBUG 596 printk(KERN_DEBUG "BA request denied - session is not " 597 "idle on tid %u\n", tid); 598#endif /* CONFIG_MAC80211_HT_DEBUG */ 599 ret = -EAGAIN; 600 goto err_unlock_sta; 601 } 602 603 /* prepare A-MPDU MLME for Tx aggregation */ 604 sta->ampdu_mlme.tid_tx[tid] = 605 kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); 606 if (!sta->ampdu_mlme.tid_tx[tid]) { 607#ifdef CONFIG_MAC80211_HT_DEBUG 608 if (net_ratelimit()) 609 printk(KERN_ERR "allocate tx mlme to tid %d failed\n", 610 tid); 611#endif 612 ret = -ENOMEM; 613 goto err_unlock_sta; 614 } 615 /* Tx timer */ 616 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function = 617 sta_addba_resp_timer_expired; 618 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data = 619 (unsigned long)&sta->timer_to_tid[tid]; 620 init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); 621 622 /* ensure that TX flow won't interrupt us 623 * until the end of the call to requeue function */ 624 txq = &local->mdev->tx_queue; 625 spin_lock_bh(&txq->lock); 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(&txq->lock); 665 spin_unlock_bh(&sta->lock); 666 667 /* send an addBA request */ 668 sta->ampdu_mlme.dialog_token_allocator++; 669 sta->ampdu_mlme.tid_tx[tid]->dialog_token = 670 sta->ampdu_mlme.dialog_token_allocator; 671 sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num; 672 673 674 ieee80211_send_addba_request(sta->sdata->dev, ra, tid, 675 sta->ampdu_mlme.tid_tx[tid]->dialog_token, 676 sta->ampdu_mlme.tid_tx[tid]->ssn, 677 0x40, 5000); 678 /* activate the timer for the recipient's addBA response */ 679 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires = 680 jiffies + ADDBA_RESP_INTERVAL; 681 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); 682#ifdef CONFIG_MAC80211_HT_DEBUG 683 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); 684#endif 685 goto exit; 686 687err_unlock_queue: 688 kfree(sta->ampdu_mlme.tid_tx[tid]); 689 sta->ampdu_mlme.tid_tx[tid] = NULL; 690 spin_unlock_bh(&txq->lock); 691 ret = -EBUSY; 692err_unlock_sta: 693 spin_unlock_bh(&sta->lock); 694exit: 695 rcu_read_unlock(); 696 return ret; 697} 698EXPORT_SYMBOL(ieee80211_start_tx_ba_session); 699 700int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw, 701 u8 *ra, u16 tid, 702 enum ieee80211_back_parties initiator) 703{ 704 struct ieee80211_local *local = hw_to_local(hw); 705 struct sta_info *sta; 706 u8 *state; 707 int ret = 0; 708 DECLARE_MAC_BUF(mac); 709 710 if (tid >= STA_TID_NUM) 711 return -EINVAL; 712 713 rcu_read_lock(); 714 sta = sta_info_get(local, ra); 715 if (!sta) { 716 rcu_read_unlock(); 717 return -ENOENT; 718 } 719 720 /* check if the TID is in aggregation */ 721 state = &sta->ampdu_mlme.tid_state_tx[tid]; 722 spin_lock_bh(&sta->lock); 723 724 if (*state != HT_AGG_STATE_OPERATIONAL) { 725 ret = -ENOENT; 726 goto stop_BA_exit; 727 } 728 729#ifdef CONFIG_MAC80211_HT_DEBUG 730 printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n", 731 print_mac(mac, ra), tid); 732#endif /* CONFIG_MAC80211_HT_DEBUG */ 733 734 ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]); 735 736 *state = HT_AGG_STATE_REQ_STOP_BA_MSK | 737 (initiator << HT_AGG_STATE_INITIATOR_SHIFT); 738 739 if (local->ops->ampdu_action) 740 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP, 741 ra, tid, NULL); 742 743 /* case HW denied going back to legacy */ 744 if (ret) { 745 WARN_ON(ret != -EBUSY); 746 *state = HT_AGG_STATE_OPERATIONAL; 747 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); 748 goto stop_BA_exit; 749 } 750 751stop_BA_exit: 752 spin_unlock_bh(&sta->lock); 753 rcu_read_unlock(); 754 return ret; 755} 756EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); 757 758void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid) 759{ 760 struct ieee80211_local *local = hw_to_local(hw); 761 struct sta_info *sta; 762 u8 *state; 763 DECLARE_MAC_BUF(mac); 764 765 if (tid >= STA_TID_NUM) { 766#ifdef CONFIG_MAC80211_HT_DEBUG 767 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", 768 tid, STA_TID_NUM); 769#endif 770 return; 771 } 772 773 rcu_read_lock(); 774 sta = sta_info_get(local, ra); 775 if (!sta) { 776 rcu_read_unlock(); 777#ifdef CONFIG_MAC80211_HT_DEBUG 778 printk(KERN_DEBUG "Could not find station: %s\n", 779 print_mac(mac, ra)); 780#endif 781 return; 782 } 783 784 state = &sta->ampdu_mlme.tid_state_tx[tid]; 785 spin_lock_bh(&sta->lock); 786 787 if (!(*state & HT_ADDBA_REQUESTED_MSK)) { 788#ifdef CONFIG_MAC80211_HT_DEBUG 789 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n", 790 *state); 791#endif 792 spin_unlock_bh(&sta->lock); 793 rcu_read_unlock(); 794 return; 795 } 796 797 WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK); 798 799 *state |= HT_ADDBA_DRV_READY_MSK; 800 801 if (*state == HT_AGG_STATE_OPERATIONAL) { 802#ifdef CONFIG_MAC80211_HT_DEBUG 803 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid); 804#endif 805 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); 806 } 807 spin_unlock_bh(&sta->lock); 808 rcu_read_unlock(); 809} 810EXPORT_SYMBOL(ieee80211_start_tx_ba_cb); 811 812void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid) 813{ 814 struct ieee80211_local *local = hw_to_local(hw); 815 struct netdev_queue *txq; 816 struct sta_info *sta; 817 u8 *state; 818 int agg_queue; 819 DECLARE_MAC_BUF(mac); 820 821 if (tid >= STA_TID_NUM) { 822#ifdef CONFIG_MAC80211_HT_DEBUG 823 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", 824 tid, STA_TID_NUM); 825#endif 826 return; 827 } 828 829#ifdef CONFIG_MAC80211_HT_DEBUG 830 printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n", 831 print_mac(mac, ra), tid); 832#endif /* CONFIG_MAC80211_HT_DEBUG */ 833 834 rcu_read_lock(); 835 sta = sta_info_get(local, ra); 836 if (!sta) { 837#ifdef CONFIG_MAC80211_HT_DEBUG 838 printk(KERN_DEBUG "Could not find station: %s\n", 839 print_mac(mac, ra)); 840#endif 841 rcu_read_unlock(); 842 return; 843 } 844 state = &sta->ampdu_mlme.tid_state_tx[tid]; 845 846 /* NOTE: no need to use sta->lock in this state check, as 847 * ieee80211_stop_tx_ba_session will let only 848 * one stop call to pass through per sta/tid */ 849 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) { 850#ifdef CONFIG_MAC80211_HT_DEBUG 851 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); 852#endif 853 rcu_read_unlock(); 854 return; 855 } 856 857 if (*state & HT_AGG_STATE_INITIATOR_MSK) 858 ieee80211_send_delba(sta->sdata->dev, ra, tid, 859 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); 860 861 agg_queue = sta->tid_to_tx_q[tid]; 862 863 /* avoid ordering issues: we are the only one that can modify 864 * the content of the qdiscs */ 865 txq = &local->mdev->tx_queue; 866 spin_lock_bh(&txq->lock); 867 /* remove the queue for this aggregation */ 868 ieee80211_ht_agg_queue_remove(local, sta, tid, 1); 869 spin_unlock_bh(&txq->lock); 870 871 /* we just requeued the all the frames that were in the removed 872 * queue, and since we might miss a softirq we do netif_schedule_queue. 873 * ieee80211_wake_queue is not used here as this queue is not 874 * necessarily stopped */ 875 netif_schedule_queue(txq); 876 spin_lock_bh(&sta->lock); 877 *state = HT_AGG_STATE_IDLE; 878 sta->ampdu_mlme.addba_req_num[tid] = 0; 879 kfree(sta->ampdu_mlme.tid_tx[tid]); 880 sta->ampdu_mlme.tid_tx[tid] = NULL; 881 spin_unlock_bh(&sta->lock); 882 883 rcu_read_unlock(); 884} 885EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb); 886 887void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, 888 const u8 *ra, u16 tid) 889{ 890 struct ieee80211_local *local = hw_to_local(hw); 891 struct ieee80211_ra_tid *ra_tid; 892 struct sk_buff *skb = dev_alloc_skb(0); 893 894 if (unlikely(!skb)) { 895#ifdef CONFIG_MAC80211_HT_DEBUG 896 if (net_ratelimit()) 897 printk(KERN_WARNING "%s: Not enough memory, " 898 "dropping start BA session", skb->dev->name); 899#endif 900 return; 901 } 902 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 903 memcpy(&ra_tid->ra, ra, ETH_ALEN); 904 ra_tid->tid = tid; 905 906 skb->pkt_type = IEEE80211_ADDBA_MSG; 907 skb_queue_tail(&local->skb_queue, skb); 908 tasklet_schedule(&local->tasklet); 909} 910EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); 911 912void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, 913 const u8 *ra, u16 tid) 914{ 915 struct ieee80211_local *local = hw_to_local(hw); 916 struct ieee80211_ra_tid *ra_tid; 917 struct sk_buff *skb = dev_alloc_skb(0); 918 919 if (unlikely(!skb)) { 920#ifdef CONFIG_MAC80211_HT_DEBUG 921 if (net_ratelimit()) 922 printk(KERN_WARNING "%s: Not enough memory, " 923 "dropping stop BA session", skb->dev->name); 924#endif 925 return; 926 } 927 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 928 memcpy(&ra_tid->ra, ra, ETH_ALEN); 929 ra_tid->tid = tid; 930 931 skb->pkt_type = IEEE80211_DELBA_MSG; 932 skb_queue_tail(&local->skb_queue, skb); 933 tasklet_schedule(&local->tasklet); 934} 935EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); 936 937static void ieee80211_set_multicast_list(struct net_device *dev) 938{ 939 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 940 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 941 int allmulti, promisc, sdata_allmulti, sdata_promisc; 942 943 allmulti = !!(dev->flags & IFF_ALLMULTI); 944 promisc = !!(dev->flags & IFF_PROMISC); 945 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 946 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); 947 948 if (allmulti != sdata_allmulti) { 949 if (dev->flags & IFF_ALLMULTI) 950 atomic_inc(&local->iff_allmultis); 951 else 952 atomic_dec(&local->iff_allmultis); 953 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 954 } 955 956 if (promisc != sdata_promisc) { 957 if (dev->flags & IFF_PROMISC) 958 atomic_inc(&local->iff_promiscs); 959 else 960 atomic_dec(&local->iff_promiscs); 961 sdata->flags ^= IEEE80211_SDATA_PROMISC; 962 } 963 964 dev_mc_sync(local->mdev, dev); 965} 966 967static const struct header_ops ieee80211_header_ops = { 968 .create = eth_header, 969 .parse = header_parse_80211, 970 .rebuild = eth_rebuild_header, 971 .cache = eth_header_cache, 972 .cache_update = eth_header_cache_update, 973}; 974 975void ieee80211_if_setup(struct net_device *dev) 976{ 977 ether_setup(dev); 978 dev->hard_start_xmit = ieee80211_subif_start_xmit; 979 dev->wireless_handlers = &ieee80211_iw_handler_def; 980 dev->set_multicast_list = ieee80211_set_multicast_list; 981 dev->change_mtu = ieee80211_change_mtu; 982 dev->open = ieee80211_open; 983 dev->stop = ieee80211_stop; 984 dev->destructor = free_netdev; 985} 986 987/* everything else */ 988 989int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed) 990{ 991 struct ieee80211_local *local = sdata->local; 992 struct ieee80211_if_conf conf; 993 994 if (WARN_ON(!netif_running(sdata->dev))) 995 return 0; 996 997 if (!local->ops->config_interface) 998 return 0; 999 1000 memset(&conf, 0, sizeof(conf)); 1001 conf.changed = changed; 1002 1003 if (sdata->vif.type == IEEE80211_IF_TYPE_STA || 1004 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) { 1005 conf.bssid = sdata->u.sta.bssid; 1006 conf.ssid = sdata->u.sta.ssid; 1007 conf.ssid_len = sdata->u.sta.ssid_len; 1008 } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) { 1009 conf.bssid = sdata->dev->dev_addr; 1010 conf.ssid = sdata->u.ap.ssid; 1011 conf.ssid_len = sdata->u.ap.ssid_len; 1012 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 1013 u8 zero[ETH_ALEN] = { 0 }; 1014 conf.bssid = zero; 1015 conf.ssid = zero; 1016 conf.ssid_len = 0; 1017 } else { 1018 WARN_ON(1); 1019 return -EINVAL; 1020 } 1021 1022 if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID))) 1023 return -EINVAL; 1024 1025 if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID))) 1026 return -EINVAL; 1027 1028 return local->ops->config_interface(local_to_hw(local), 1029 &sdata->vif, &conf); 1030} 1031 1032int ieee80211_hw_config(struct ieee80211_local *local) 1033{ 1034 struct ieee80211_channel *chan; 1035 int ret = 0; 1036 1037 if (local->sta_sw_scanning) 1038 chan = local->scan_channel; 1039 else 1040 chan = local->oper_channel; 1041 1042 local->hw.conf.channel = chan; 1043 1044 if (!local->hw.conf.power_level) 1045 local->hw.conf.power_level = chan->max_power; 1046 else 1047 local->hw.conf.power_level = min(chan->max_power, 1048 local->hw.conf.power_level); 1049 1050 local->hw.conf.max_antenna_gain = chan->max_antenna_gain; 1051 1052#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1053 printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n", 1054 wiphy_name(local->hw.wiphy), chan->center_freq); 1055#endif 1056 1057 if (local->open_count) 1058 ret = local->ops->config(local_to_hw(local), &local->hw.conf); 1059 1060 return ret; 1061} 1062 1063/** 1064 * ieee80211_handle_ht should be used only after legacy configuration 1065 * has been determined namely band, as ht configuration depends upon 1066 * the hardware's HT abilities for a _specific_ band. 1067 */ 1068u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht, 1069 struct ieee80211_ht_info *req_ht_cap, 1070 struct ieee80211_ht_bss_info *req_bss_cap) 1071{ 1072 struct ieee80211_conf *conf = &local->hw.conf; 1073 struct ieee80211_supported_band *sband; 1074 struct ieee80211_ht_info ht_conf; 1075 struct ieee80211_ht_bss_info ht_bss_conf; 1076 u32 changed = 0; 1077 int i; 1078 u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS; 1079 u8 tx_mcs_set_cap; 1080 1081 sband = local->hw.wiphy->bands[conf->channel->band]; 1082 1083 memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info)); 1084 memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info)); 1085 1086 /* HT is not supported */ 1087 if (!sband->ht_info.ht_supported) { 1088 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE; 1089 goto out; 1090 } 1091 1092 /* disable HT */ 1093 if (!enable_ht) { 1094 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) 1095 changed |= BSS_CHANGED_HT; 1096 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE; 1097 conf->ht_conf.ht_supported = 0; 1098 goto out; 1099 } 1100 1101 1102 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) 1103 changed |= BSS_CHANGED_HT; 1104 1105 conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE; 1106 ht_conf.ht_supported = 1; 1107 1108 ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap; 1109 ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS); 1110 ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS; 1111 ht_bss_conf.primary_channel = req_bss_cap->primary_channel; 1112 ht_bss_conf.bss_cap = req_bss_cap->bss_cap; 1113 ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode; 1114 1115 ht_conf.ampdu_factor = req_ht_cap->ampdu_factor; 1116 ht_conf.ampdu_density = req_ht_cap->ampdu_density; 1117 1118 /* Bits 96-100 */ 1119 tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12]; 1120 1121 /* configure suppoerted Tx MCS according to requested MCS 1122 * (based in most cases on Rx capabilities of peer) and self 1123 * Tx MCS capabilities (as defined by low level driver HW 1124 * Tx capabilities) */ 1125 if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED)) 1126 goto check_changed; 1127 1128 /* Counting from 0 therfore + 1 */ 1129 if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF) 1130 max_tx_streams = ((tx_mcs_set_cap & 1131 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1; 1132 1133 for (i = 0; i < max_tx_streams; 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 if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM) 1139 for (i = IEEE80211_SUPP_MCS_SET_UEQM; 1140 i < IEEE80211_SUPP_MCS_SET_LEN; i++) 1141 ht_conf.supp_mcs_set[i] = 1142 sband->ht_info.supp_mcs_set[i] & 1143 req_ht_cap->supp_mcs_set[i]; 1144 1145check_changed: 1146 /* if bss configuration changed store the new one */ 1147 if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) || 1148 memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) { 1149 changed |= BSS_CHANGED_HT; 1150 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf)); 1151 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf)); 1152 } 1153out: 1154 return changed; 1155} 1156 1157void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 1158 u32 changed) 1159{ 1160 struct ieee80211_local *local = sdata->local; 1161 1162 if (!changed) 1163 return; 1164 1165 if (local->ops->bss_info_changed) 1166 local->ops->bss_info_changed(local_to_hw(local), 1167 &sdata->vif, 1168 &sdata->bss_conf, 1169 changed); 1170} 1171 1172u32 ieee80211_reset_erp_info(struct net_device *dev) 1173{ 1174 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1175 1176 sdata->bss_conf.use_cts_prot = 0; 1177 sdata->bss_conf.use_short_preamble = 0; 1178 return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE; 1179} 1180 1181void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, 1182 struct sk_buff *skb) 1183{ 1184 struct ieee80211_local *local = hw_to_local(hw); 1185 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1186 int tmp; 1187 1188 skb->dev = local->mdev; 1189 skb->pkt_type = IEEE80211_TX_STATUS_MSG; 1190 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ? 1191 &local->skb_queue : &local->skb_queue_unreliable, skb); 1192 tmp = skb_queue_len(&local->skb_queue) + 1193 skb_queue_len(&local->skb_queue_unreliable); 1194 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && 1195 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 1196 dev_kfree_skb_irq(skb); 1197 tmp--; 1198 I802_DEBUG_INC(local->tx_status_drop); 1199 } 1200 tasklet_schedule(&local->tasklet); 1201} 1202EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); 1203 1204static void ieee80211_tasklet_handler(unsigned long data) 1205{ 1206 struct ieee80211_local *local = (struct ieee80211_local *) data; 1207 struct sk_buff *skb; 1208 struct ieee80211_rx_status rx_status; 1209 struct ieee80211_ra_tid *ra_tid; 1210 1211 while ((skb = skb_dequeue(&local->skb_queue)) || 1212 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 1213 switch (skb->pkt_type) { 1214 case IEEE80211_RX_MSG: 1215 /* status is in skb->cb */ 1216 memcpy(&rx_status, skb->cb, sizeof(rx_status)); 1217 /* Clear skb->pkt_type in order to not confuse kernel 1218 * netstack. */ 1219 skb->pkt_type = 0; 1220 __ieee80211_rx(local_to_hw(local), skb, &rx_status); 1221 break; 1222 case IEEE80211_TX_STATUS_MSG: 1223 skb->pkt_type = 0; 1224 ieee80211_tx_status(local_to_hw(local), skb); 1225 break; 1226 case IEEE80211_DELBA_MSG: 1227 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 1228 ieee80211_stop_tx_ba_cb(local_to_hw(local), 1229 ra_tid->ra, ra_tid->tid); 1230 dev_kfree_skb(skb); 1231 break; 1232 case IEEE80211_ADDBA_MSG: 1233 ra_tid = (struct ieee80211_ra_tid *) &skb->cb; 1234 ieee80211_start_tx_ba_cb(local_to_hw(local), 1235 ra_tid->ra, ra_tid->tid); 1236 dev_kfree_skb(skb); 1237 break ; 1238 default: 1239 WARN_ON(1); 1240 dev_kfree_skb(skb); 1241 break; 1242 } 1243 } 1244} 1245 1246/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to 1247 * make a prepared TX frame (one that has been given to hw) to look like brand 1248 * new IEEE 802.11 frame that is ready to go through TX processing again. 1249 * Also, tx_packet_data in cb is restored from tx_control. */ 1250static void ieee80211_remove_tx_extra(struct ieee80211_local *local, 1251 struct ieee80211_key *key, 1252 struct sk_buff *skb) 1253{ 1254 int hdrlen, iv_len, mic_len; 1255 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1256 1257 info->flags &= IEEE80211_TX_CTL_REQ_TX_STATUS | 1258 IEEE80211_TX_CTL_DO_NOT_ENCRYPT | 1259 IEEE80211_TX_CTL_REQUEUE | 1260 IEEE80211_TX_CTL_EAPOL_FRAME; 1261 1262 hdrlen = ieee80211_get_hdrlen_from_skb(skb); 1263 1264 if (!key) 1265 goto no_key; 1266 1267 switch (key->conf.alg) { 1268 case ALG_WEP: 1269 iv_len = WEP_IV_LEN; 1270 mic_len = WEP_ICV_LEN; 1271 break; 1272 case ALG_TKIP: 1273 iv_len = TKIP_IV_LEN; 1274 mic_len = TKIP_ICV_LEN; 1275 break; 1276 case ALG_CCMP: 1277 iv_len = CCMP_HDR_LEN; 1278 mic_len = CCMP_MIC_LEN; 1279 break; 1280 default: 1281 goto no_key; 1282 } 1283 1284 if (skb->len >= mic_len && 1285 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 1286 skb_trim(skb, skb->len - mic_len); 1287 if (skb->len >= iv_len && skb->len > hdrlen) { 1288 memmove(skb->data + iv_len, skb->data, hdrlen); 1289 skb_pull(skb, iv_len); 1290 } 1291 1292no_key: 1293 { 1294 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1295 u16 fc = le16_to_cpu(hdr->frame_control); 1296 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ { 1297 fc &= ~IEEE80211_STYPE_QOS_DATA; 1298 hdr->frame_control = cpu_to_le16(fc); 1299 memmove(skb->data + 2, skb->data, hdrlen - 2); 1300 skb_pull(skb, 2); 1301 } 1302 } 1303} 1304 1305static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, 1306 struct sta_info *sta, 1307 struct sk_buff *skb) 1308{ 1309 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1310 1311 sta->tx_filtered_count++; 1312 1313 /* 1314 * Clear the TX filter mask for this STA when sending the next 1315 * packet. If the STA went to power save mode, this will happen 1316 * when it wakes up for the next time. 1317 */ 1318 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT); 1319 1320 /* 1321 * This code races in the following way: 1322 * 1323 * (1) STA sends frame indicating it will go to sleep and does so 1324 * (2) hardware/firmware adds STA to filter list, passes frame up 1325 * (3) hardware/firmware processes TX fifo and suppresses a frame 1326 * (4) we get TX status before having processed the frame and 1327 * knowing that the STA has gone to sleep. 1328 * 1329 * This is actually quite unlikely even when both those events are 1330 * processed from interrupts coming in quickly after one another or 1331 * even at the same time because we queue both TX status events and 1332 * RX frames to be processed by a tasklet and process them in the 1333 * same order that they were received or TX status last. Hence, there 1334 * is no race as long as the frame RX is processed before the next TX 1335 * status, which drivers can ensure, see below. 1336 * 1337 * Note that this can only happen if the hardware or firmware can 1338 * actually add STAs to the filter list, if this is done by the 1339 * driver in response to set_tim() (which will only reduce the race 1340 * this whole filtering tries to solve, not completely solve it) 1341 * this situation cannot happen. 1342 * 1343 * To completely solve this race drivers need to make sure that they 1344 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 1345 * functions and 1346 * (b) always process RX events before TX status events if ordering 1347 * can be unknown, for example with different interrupt status 1348 * bits. 1349 */ 1350 if (test_sta_flags(sta, WLAN_STA_PS) && 1351 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) { 1352 ieee80211_remove_tx_extra(local, sta->key, skb); 1353 skb_queue_tail(&sta->tx_filtered, skb); 1354 return; 1355 } 1356 1357 if (!test_sta_flags(sta, WLAN_STA_PS) && 1358 !(info->flags & IEEE80211_TX_CTL_REQUEUE)) { 1359 /* Software retry the packet once */ 1360 info->flags |= IEEE80211_TX_CTL_REQUEUE; 1361 ieee80211_remove_tx_extra(local, sta->key, skb); 1362 dev_queue_xmit(skb); 1363 return; 1364 } 1365 1366#ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1367 if (net_ratelimit()) 1368 printk(KERN_DEBUG "%s: dropped TX filtered frame, " 1369 "queue_len=%d PS=%d @%lu\n", 1370 wiphy_name(local->hw.wiphy), 1371 skb_queue_len(&sta->tx_filtered), 1372 !!test_sta_flags(sta, WLAN_STA_PS), jiffies); 1373#endif 1374 dev_kfree_skb(skb); 1375} 1376 1377void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 1378{ 1379 struct sk_buff *skb2; 1380 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1381 struct ieee80211_local *local = hw_to_local(hw); 1382 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1383 u16 frag, type; 1384 __le16 fc; 1385 struct ieee80211_tx_status_rtap_hdr *rthdr; 1386 struct ieee80211_sub_if_data *sdata; 1387 struct net_device *prev_dev = NULL; 1388 struct sta_info *sta; 1389 1390 rcu_read_lock(); 1391 1392 if (info->status.excessive_retries) { 1393 sta = sta_info_get(local, hdr->addr1); 1394 if (sta) { 1395 if (test_sta_flags(sta, WLAN_STA_PS)) { 1396 /* 1397 * The STA is in power save mode, so assume 1398 * that this TX packet failed because of that. 1399 */ 1400 ieee80211_handle_filtered_frame(local, sta, skb); 1401 rcu_read_unlock(); 1402 return; 1403 } 1404 } 1405 } 1406 1407 fc = hdr->frame_control; 1408 1409 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 1410 (ieee80211_is_data_qos(fc))) { 1411 u16 tid, ssn; 1412 u8 *qc; 1413 sta = sta_info_get(local, hdr->addr1); 1414 if (sta) { 1415 qc = ieee80211_get_qos_ctl(hdr); 1416 tid = qc[0] & 0xf; 1417 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 1418 & IEEE80211_SCTL_SEQ); 1419 ieee80211_send_bar(sta->sdata->dev, hdr->addr1, 1420 tid, ssn); 1421 } 1422 } 1423 1424 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 1425 sta = sta_info_get(local, hdr->addr1); 1426 if (sta) { 1427 ieee80211_handle_filtered_frame(local, sta, skb); 1428 rcu_read_unlock(); 1429 return; 1430 } 1431 } else 1432 rate_control_tx_status(local->mdev, skb); 1433 1434 rcu_read_unlock(); 1435 1436 ieee80211_led_tx(local, 0); 1437 1438 /* SNMP counters 1439 * Fragments are passed to low-level drivers as separate skbs, so these 1440 * are actually fragments, not frames. Update frame counters only for 1441 * the first fragment of the frame. */ 1442 1443 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG; 1444 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE; 1445 1446 if (info->flags & IEEE80211_TX_STAT_ACK) { 1447 if (frag == 0) { 1448 local->dot11TransmittedFrameCount++; 1449 if (is_multicast_ether_addr(hdr->addr1)) 1450 local->dot11MulticastTransmittedFrameCount++; 1451 if (info->status.retry_count > 0) 1452 local->dot11RetryCount++; 1453 if (info->status.retry_count > 1) 1454 local->dot11MultipleRetryCount++; 1455 } 1456 1457 /* This counter shall be incremented for an acknowledged MPDU 1458 * with an individual address in the address 1 field or an MPDU 1459 * with a multicast address in the address 1 field of type Data 1460 * or Management. */ 1461 if (!is_multicast_ether_addr(hdr->addr1) || 1462 type == IEEE80211_FTYPE_DATA || 1463 type == IEEE80211_FTYPE_MGMT) 1464 local->dot11TransmittedFragmentCount++; 1465 } else { 1466 if (frag == 0) 1467 local->dot11FailedCount++; 1468 } 1469 1470 /* this was a transmitted frame, but now we want to reuse it */ 1471 skb_orphan(skb); 1472 1473 /* 1474 * This is a bit racy but we can avoid a lot of work 1475 * with this test... 1476 */ 1477 if (!local->monitors && !local->cooked_mntrs) { 1478 dev_kfree_skb(skb); 1479 return; 1480 } 1481 1482 /* send frame to monitor interfaces now */ 1483 1484 if (skb_headroom(skb) < sizeof(*rthdr)) { 1485 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n"); 1486 dev_kfree_skb(skb); 1487 return; 1488 } 1489 1490 rthdr = (struct ieee80211_tx_status_rtap_hdr *) 1491 skb_push(skb, sizeof(*rthdr)); 1492 1493 memset(rthdr, 0, sizeof(*rthdr)); 1494 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); 1495 rthdr->hdr.it_present = 1496 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 1497 (1 << IEEE80211_RADIOTAP_DATA_RETRIES)); 1498 1499 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 1500 !is_multicast_ether_addr(hdr->addr1)) 1501 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL); 1502 1503 if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) && 1504 (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) 1505 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS); 1506 else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) 1507 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS); 1508 1509 rthdr->data_retries = info->status.retry_count; 1510 1511 /* XXX: is this sufficient for BPF? */ 1512 skb_set_mac_header(skb, 0); 1513 skb->ip_summed = CHECKSUM_UNNECESSARY; 1514 skb->pkt_type = PACKET_OTHERHOST; 1515 skb->protocol = htons(ETH_P_802_2); 1516 memset(skb->cb, 0, sizeof(skb->cb)); 1517 1518 rcu_read_lock(); 1519 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 1520 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) { 1521 if (!netif_running(sdata->dev)) 1522 continue; 1523 1524 if (prev_dev) { 1525 skb2 = skb_clone(skb, GFP_ATOMIC); 1526 if (skb2) { 1527 skb2->dev = prev_dev; 1528 netif_rx(skb2); 1529 } 1530 } 1531 1532 prev_dev = sdata->dev; 1533 } 1534 } 1535 if (prev_dev) { 1536 skb->dev = prev_dev; 1537 netif_rx(skb); 1538 skb = NULL; 1539 } 1540 rcu_read_unlock(); 1541 dev_kfree_skb(skb); 1542} 1543EXPORT_SYMBOL(ieee80211_tx_status); 1544 1545struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 1546 const struct ieee80211_ops *ops) 1547{ 1548 struct ieee80211_local *local; 1549 int priv_size; 1550 struct wiphy *wiphy; 1551 1552 /* Ensure 32-byte alignment of our private data and hw private data. 1553 * We use the wiphy priv data for both our ieee80211_local and for 1554 * the driver's private data 1555 * 1556 * In memory it'll be like this: 1557 * 1558 * +-------------------------+ 1559 * | struct wiphy | 1560 * +-------------------------+ 1561 * | struct ieee80211_local | 1562 * +-------------------------+ 1563 * | driver's private data | 1564 * +-------------------------+ 1565 * 1566 */ 1567 priv_size = ((sizeof(struct ieee80211_local) + 1568 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) + 1569 priv_data_len; 1570 1571 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 1572 1573 if (!wiphy) 1574 return NULL; 1575 1576 wiphy->privid = mac80211_wiphy_privid; 1577 1578 local = wiphy_priv(wiphy); 1579 local->hw.wiphy = wiphy; 1580 1581 local->hw.priv = (char *)local + 1582 ((sizeof(struct ieee80211_local) + 1583 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST); 1584 1585 BUG_ON(!ops->tx); 1586 BUG_ON(!ops->start); 1587 BUG_ON(!ops->stop); 1588 BUG_ON(!ops->config); 1589 BUG_ON(!ops->add_interface); 1590 BUG_ON(!ops->remove_interface); 1591 BUG_ON(!ops->configure_filter); 1592 local->ops = ops; 1593 1594 local->hw.queues = 1; /* default */ 1595 1596 local->bridge_packets = 1; 1597 1598 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD; 1599 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD; 1600 local->short_retry_limit = 7; 1601 local->long_retry_limit = 4; 1602 local->hw.conf.radio_enabled = 1; 1603 1604 INIT_LIST_HEAD(&local->interfaces); 1605 1606 spin_lock_init(&local->key_lock); 1607 1608 INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work); 1609 1610 sta_info_init(local); 1611 1612 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 1613 (unsigned long)local); 1614 tasklet_disable(&local->tx_pending_tasklet); 1615 1616 tasklet_init(&local->tasklet, 1617 ieee80211_tasklet_handler, 1618 (unsigned long) local); 1619 tasklet_disable(&local->tasklet); 1620 1621 skb_queue_head_init(&local->skb_queue); 1622 skb_queue_head_init(&local->skb_queue_unreliable); 1623 1624 return local_to_hw(local); 1625} 1626EXPORT_SYMBOL(ieee80211_alloc_hw); 1627 1628int ieee80211_register_hw(struct ieee80211_hw *hw) 1629{ 1630 struct ieee80211_local *local = hw_to_local(hw); 1631 const char *name; 1632 int result; 1633 enum ieee80211_band band; 1634 struct net_device *mdev; 1635 struct wireless_dev *mwdev; 1636 1637 /* 1638 * generic code guarantees at least one band, 1639 * set this very early because much code assumes 1640 * that hw.conf.channel is assigned 1641 */ 1642 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1643 struct ieee80211_supported_band *sband; 1644 1645 sband = local->hw.wiphy->bands[band]; 1646 if (sband) { 1647 /* init channel we're on */ 1648 local->hw.conf.channel = 1649 local->oper_channel = 1650 local->scan_channel = &sband->channels[0]; 1651 break; 1652 } 1653 } 1654 1655 result = wiphy_register(local->hw.wiphy); 1656 if (result < 0) 1657 return result; 1658 1659 /* 1660 * We use the number of queues for feature tests (QoS, HT) internally 1661 * so restrict them appropriately. 1662 */ 1663#ifdef CONFIG_MAC80211_QOS 1664 if (hw->queues > IEEE80211_MAX_QUEUES) 1665 hw->queues = IEEE80211_MAX_QUEUES; 1666 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES) 1667 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES; 1668 if (hw->queues < 4) 1669 hw->ampdu_queues = 0; 1670#else 1671 hw->queues = 1; 1672 hw->ampdu_queues = 0; 1673#endif 1674 1675 mdev = alloc_netdev_mq(sizeof(struct wireless_dev), 1676 "wmaster%d", ether_setup, 1677 ieee80211_num_queues(hw)); 1678 if (!mdev) 1679 goto fail_mdev_alloc; 1680 1681 if (ieee80211_num_queues(hw) > 1) 1682 mdev->features |= NETIF_F_MULTI_QUEUE; 1683 1684 mwdev = netdev_priv(mdev); 1685 mdev->ieee80211_ptr = mwdev; 1686 mwdev->wiphy = local->hw.wiphy; 1687 1688 local->mdev = mdev; 1689 1690 ieee80211_rx_bss_list_init(local); 1691 1692 mdev->hard_start_xmit = ieee80211_master_start_xmit; 1693 mdev->open = ieee80211_master_open; 1694 mdev->stop = ieee80211_master_stop; 1695 mdev->type = ARPHRD_IEEE80211; 1696 mdev->header_ops = &ieee80211_header_ops; 1697 mdev->set_multicast_list = ieee80211_master_set_multicast_list; 1698 1699 name = wiphy_dev(local->hw.wiphy)->driver->name; 1700 local->hw.workqueue = create_freezeable_workqueue(name); 1701 if (!local->hw.workqueue) { 1702 result = -ENOMEM; 1703 goto fail_workqueue; 1704 } 1705 1706 /* 1707 * The hardware needs headroom for sending the frame, 1708 * and we need some headroom for passing the frame to monitor 1709 * interfaces, but never both at the same time. 1710 */ 1711 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 1712 sizeof(struct ieee80211_tx_status_rtap_hdr)); 1713 1714 debugfs_hw_add(local); 1715 1716 if (local->hw.conf.beacon_int < 10) 1717 local->hw.conf.beacon_int = 100; 1718 1719 local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC | 1720 IEEE80211_HW_SIGNAL_DB | 1721 IEEE80211_HW_SIGNAL_DBM) ? 1722 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID; 1723 local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ? 1724 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID; 1725 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 1726 local->wstats_flags |= IW_QUAL_DBM; 1727 1728 result = sta_info_start(local); 1729 if (result < 0) 1730 goto fail_sta_info; 1731 1732 rtnl_lock(); 1733 result = dev_alloc_name(local->mdev, local->mdev->name); 1734 if (result < 0) 1735 goto fail_dev; 1736 1737 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1738 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy)); 1739 1740 result = register_netdevice(local->mdev); 1741 if (result < 0) 1742 goto fail_dev; 1743 1744 result = ieee80211_init_rate_ctrl_alg(local, 1745 hw->rate_control_algorithm); 1746 if (result < 0) { 1747 printk(KERN_DEBUG "%s: Failed to initialize rate control " 1748 "algorithm\n", wiphy_name(local->hw.wiphy)); 1749 goto fail_rate; 1750 } 1751 1752 result = ieee80211_wep_init(local); 1753 1754 if (result < 0) { 1755 printk(KERN_DEBUG "%s: Failed to initialize wep\n", 1756 wiphy_name(local->hw.wiphy)); 1757 goto fail_wep; 1758 } 1759 1760 ieee80211_install_qdisc(local->mdev); 1761 1762 /* add one default STA interface */ 1763 result = ieee80211_if_add(local, "wlan%d", NULL, 1764 IEEE80211_IF_TYPE_STA, NULL); 1765 if (result) 1766 printk(KERN_WARNING "%s: Failed to add default virtual iface\n", 1767 wiphy_name(local->hw.wiphy)); 1768 1769 rtnl_unlock(); 1770 1771 ieee80211_led_init(local); 1772 1773 return 0; 1774 1775fail_wep: 1776 rate_control_deinitialize(local); 1777fail_rate: 1778 unregister_netdevice(local->mdev); 1779 local->mdev = NULL; 1780fail_dev: 1781 rtnl_unlock(); 1782 sta_info_stop(local); 1783fail_sta_info: 1784 debugfs_hw_del(local); 1785 destroy_workqueue(local->hw.workqueue); 1786fail_workqueue: 1787 if (local->mdev) 1788 free_netdev(local->mdev); 1789fail_mdev_alloc: 1790 wiphy_unregister(local->hw.wiphy); 1791 return result; 1792} 1793EXPORT_SYMBOL(ieee80211_register_hw); 1794 1795void ieee80211_unregister_hw(struct ieee80211_hw *hw) 1796{ 1797 struct ieee80211_local *local = hw_to_local(hw); 1798 1799 tasklet_kill(&local->tx_pending_tasklet); 1800 tasklet_kill(&local->tasklet); 1801 1802 rtnl_lock(); 1803 1804 /* 1805 * At this point, interface list manipulations are fine 1806 * because the driver cannot be handing us frames any 1807 * more and the tasklet is killed. 1808 */ 1809 1810 /* First, we remove all virtual interfaces. */ 1811 ieee80211_remove_interfaces(local); 1812 1813 /* then, finally, remove the master interface */ 1814 unregister_netdevice(local->mdev); 1815 1816 rtnl_unlock(); 1817 1818 ieee80211_rx_bss_list_deinit(local); 1819 ieee80211_clear_tx_pending(local); 1820 sta_info_stop(local); 1821 rate_control_deinitialize(local); 1822 debugfs_hw_del(local); 1823 1824 if (skb_queue_len(&local->skb_queue) 1825 || skb_queue_len(&local->skb_queue_unreliable)) 1826 printk(KERN_WARNING "%s: skb_queue not empty\n", 1827 wiphy_name(local->hw.wiphy)); 1828 skb_queue_purge(&local->skb_queue); 1829 skb_queue_purge(&local->skb_queue_unreliable); 1830 1831 destroy_workqueue(local->hw.workqueue); 1832 wiphy_unregister(local->hw.wiphy); 1833 ieee80211_wep_free(local); 1834 ieee80211_led_exit(local); 1835 free_netdev(local->mdev); 1836} 1837EXPORT_SYMBOL(ieee80211_unregister_hw); 1838 1839void ieee80211_free_hw(struct ieee80211_hw *hw) 1840{ 1841 struct ieee80211_local *local = hw_to_local(hw); 1842 1843 wiphy_free(local->hw.wiphy); 1844} 1845EXPORT_SYMBOL(ieee80211_free_hw); 1846 1847static int __init ieee80211_init(void) 1848{ 1849 struct sk_buff *skb; 1850 int ret; 1851 1852 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1853 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1854 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1855 1856 ret = rc80211_pid_init(); 1857 if (ret) 1858 goto out; 1859 1860 ret = ieee80211_wme_register(); 1861 if (ret) { 1862 printk(KERN_DEBUG "ieee80211_init: failed to " 1863 "initialize WME (err=%d)\n", ret); 1864 goto out_cleanup_pid; 1865 } 1866 1867 ieee80211_debugfs_netdev_init(); 1868 1869 return 0; 1870 1871 out_cleanup_pid: 1872 rc80211_pid_exit(); 1873 out: 1874 return ret; 1875} 1876 1877static void __exit ieee80211_exit(void) 1878{ 1879 rc80211_pid_exit(); 1880 1881 /* 1882 * For key todo, it'll be empty by now but the work 1883 * might still be scheduled. 1884 */ 1885 flush_scheduled_work(); 1886 1887 if (mesh_allocated) 1888 ieee80211s_stop(); 1889 1890 ieee80211_wme_unregister(); 1891 ieee80211_debugfs_netdev_exit(); 1892} 1893 1894 1895subsys_initcall(ieee80211_init); 1896module_exit(ieee80211_exit); 1897 1898MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1899MODULE_LICENSE("GPL"); 1900