main.c revision 681c4d07dd5b2ce2ad9f6dbbf7841e479fbc7754
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 <linux/module.h> 13#include <linux/init.h> 14#include <linux/netdevice.h> 15#include <linux/types.h> 16#include <linux/slab.h> 17#include <linux/skbuff.h> 18#include <linux/etherdevice.h> 19#include <linux/if_arp.h> 20#include <linux/rtnetlink.h> 21#include <linux/bitmap.h> 22#include <linux/pm_qos_params.h> 23#include <linux/inetdevice.h> 24#include <net/net_namespace.h> 25#include <net/cfg80211.h> 26 27#include "ieee80211_i.h" 28#include "driver-ops.h" 29#include "rate.h" 30#include "mesh.h" 31#include "wep.h" 32#include "led.h" 33#include "cfg.h" 34#include "debugfs.h" 35 36 37bool ieee80211_disable_40mhz_24ghz; 38module_param(ieee80211_disable_40mhz_24ghz, bool, 0644); 39MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz, 40 "Disable 40MHz support in the 2.4GHz band"); 41 42static struct lock_class_key ieee80211_rx_skb_queue_class; 43 44void ieee80211_configure_filter(struct ieee80211_local *local) 45{ 46 u64 mc; 47 unsigned int changed_flags; 48 unsigned int new_flags = 0; 49 50 if (atomic_read(&local->iff_promiscs)) 51 new_flags |= FIF_PROMISC_IN_BSS; 52 53 if (atomic_read(&local->iff_allmultis)) 54 new_flags |= FIF_ALLMULTI; 55 56 if (local->monitors || local->scanning) 57 new_flags |= FIF_BCN_PRBRESP_PROMISC; 58 59 if (local->fif_probe_req || local->probe_req_reg) 60 new_flags |= FIF_PROBE_REQ; 61 62 if (local->fif_fcsfail) 63 new_flags |= FIF_FCSFAIL; 64 65 if (local->fif_plcpfail) 66 new_flags |= FIF_PLCPFAIL; 67 68 if (local->fif_control) 69 new_flags |= FIF_CONTROL; 70 71 if (local->fif_other_bss) 72 new_flags |= FIF_OTHER_BSS; 73 74 if (local->fif_pspoll) 75 new_flags |= FIF_PSPOLL; 76 77 spin_lock_bh(&local->filter_lock); 78 changed_flags = local->filter_flags ^ new_flags; 79 80 mc = drv_prepare_multicast(local, &local->mc_list); 81 spin_unlock_bh(&local->filter_lock); 82 83 /* be a bit nasty */ 84 new_flags |= (1<<31); 85 86 drv_configure_filter(local, changed_flags, &new_flags, mc); 87 88 WARN_ON(new_flags & (1<<31)); 89 90 local->filter_flags = new_flags & ~(1<<31); 91} 92 93static void ieee80211_reconfig_filter(struct work_struct *work) 94{ 95 struct ieee80211_local *local = 96 container_of(work, struct ieee80211_local, reconfig_filter); 97 98 ieee80211_configure_filter(local); 99} 100 101int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 102{ 103 struct ieee80211_channel *chan, *scan_chan; 104 int ret = 0; 105 int power; 106 enum nl80211_channel_type channel_type; 107 u32 offchannel_flag; 108 109 might_sleep(); 110 111 scan_chan = local->scan_channel; 112 113 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 114 if (scan_chan) { 115 chan = scan_chan; 116 channel_type = NL80211_CHAN_NO_HT; 117 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL; 118 } else if (local->tmp_channel && 119 local->oper_channel != local->tmp_channel) { 120 chan = scan_chan = local->tmp_channel; 121 channel_type = local->tmp_channel_type; 122 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL; 123 } else { 124 chan = local->oper_channel; 125 channel_type = local->_oper_channel_type; 126 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL; 127 } 128 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 129 130 if (offchannel_flag || chan != local->hw.conf.channel || 131 channel_type != local->hw.conf.channel_type) { 132 local->hw.conf.channel = chan; 133 local->hw.conf.channel_type = channel_type; 134 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 135 } 136 137 if (!conf_is_ht(&local->hw.conf)) { 138 /* 139 * mac80211.h documents that this is only valid 140 * when the channel is set to an HT type, and 141 * that otherwise STATIC is used. 142 */ 143 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC; 144 } else if (local->hw.conf.smps_mode != local->smps_mode) { 145 local->hw.conf.smps_mode = local->smps_mode; 146 changed |= IEEE80211_CONF_CHANGE_SMPS; 147 } 148 149 if (scan_chan) 150 power = chan->max_power; 151 else 152 power = local->power_constr_level ? 153 (chan->max_power - local->power_constr_level) : 154 chan->max_power; 155 156 if (local->user_power_level >= 0) 157 power = min(power, local->user_power_level); 158 159 if (local->hw.conf.power_level != power) { 160 changed |= IEEE80211_CONF_CHANGE_POWER; 161 local->hw.conf.power_level = power; 162 } 163 164 if (changed && local->open_count) { 165 ret = drv_config(local, changed); 166 /* 167 * Goal: 168 * HW reconfiguration should never fail, the driver has told 169 * us what it can support so it should live up to that promise. 170 * 171 * Current status: 172 * rfkill is not integrated with mac80211 and a 173 * configuration command can thus fail if hardware rfkill 174 * is enabled 175 * 176 * FIXME: integrate rfkill with mac80211 and then add this 177 * WARN_ON() back 178 * 179 */ 180 /* WARN_ON(ret); */ 181 } 182 183 return ret; 184} 185 186void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 187 u32 changed) 188{ 189 struct ieee80211_local *local = sdata->local; 190 static const u8 zero[ETH_ALEN] = { 0 }; 191 192 if (!changed) 193 return; 194 195 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 196 /* 197 * While not associated, claim a BSSID of all-zeroes 198 * so that drivers don't do any weird things with the 199 * BSSID at that time. 200 */ 201 if (sdata->vif.bss_conf.assoc) 202 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 203 else 204 sdata->vif.bss_conf.bssid = zero; 205 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 206 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 207 else if (sdata->vif.type == NL80211_IFTYPE_AP) 208 sdata->vif.bss_conf.bssid = sdata->vif.addr; 209 else if (sdata->vif.type == NL80211_IFTYPE_WDS) 210 sdata->vif.bss_conf.bssid = NULL; 211 else if (ieee80211_vif_is_mesh(&sdata->vif)) { 212 sdata->vif.bss_conf.bssid = zero; 213 } else { 214 WARN_ON(1); 215 return; 216 } 217 218 switch (sdata->vif.type) { 219 case NL80211_IFTYPE_AP: 220 case NL80211_IFTYPE_ADHOC: 221 case NL80211_IFTYPE_WDS: 222 case NL80211_IFTYPE_MESH_POINT: 223 break; 224 default: 225 /* do not warn to simplify caller in scan.c */ 226 changed &= ~BSS_CHANGED_BEACON_ENABLED; 227 if (WARN_ON(changed & BSS_CHANGED_BEACON)) 228 return; 229 break; 230 } 231 232 if (changed & BSS_CHANGED_BEACON_ENABLED) { 233 if (local->quiescing || !ieee80211_sdata_running(sdata) || 234 test_bit(SCAN_SW_SCANNING, &local->scanning)) { 235 sdata->vif.bss_conf.enable_beacon = false; 236 } else { 237 /* 238 * Beacon should be enabled, but AP mode must 239 * check whether there is a beacon configured. 240 */ 241 switch (sdata->vif.type) { 242 case NL80211_IFTYPE_AP: 243 sdata->vif.bss_conf.enable_beacon = 244 !!sdata->u.ap.beacon; 245 break; 246 case NL80211_IFTYPE_ADHOC: 247 sdata->vif.bss_conf.enable_beacon = 248 !!sdata->u.ibss.presp; 249 break; 250#ifdef CONFIG_MAC80211_MESH 251 case NL80211_IFTYPE_MESH_POINT: 252 sdata->vif.bss_conf.enable_beacon = 253 !!sdata->u.mesh.mesh_id_len; 254 break; 255#endif 256 default: 257 /* not reached */ 258 WARN_ON(1); 259 break; 260 } 261 } 262 } 263 264 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed); 265} 266 267u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 268{ 269 sdata->vif.bss_conf.use_cts_prot = false; 270 sdata->vif.bss_conf.use_short_preamble = false; 271 sdata->vif.bss_conf.use_short_slot = false; 272 return BSS_CHANGED_ERP_CTS_PROT | 273 BSS_CHANGED_ERP_PREAMBLE | 274 BSS_CHANGED_ERP_SLOT; 275} 276 277static void ieee80211_tasklet_handler(unsigned long data) 278{ 279 struct ieee80211_local *local = (struct ieee80211_local *) data; 280 struct sk_buff *skb; 281 282 while ((skb = skb_dequeue(&local->skb_queue)) || 283 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 284 switch (skb->pkt_type) { 285 case IEEE80211_RX_MSG: 286 /* Clear skb->pkt_type in order to not confuse kernel 287 * netstack. */ 288 skb->pkt_type = 0; 289 ieee80211_rx(local_to_hw(local), skb); 290 break; 291 case IEEE80211_TX_STATUS_MSG: 292 skb->pkt_type = 0; 293 ieee80211_tx_status(local_to_hw(local), skb); 294 break; 295 default: 296 WARN(1, "mac80211: Packet is of unknown type %d\n", 297 skb->pkt_type); 298 dev_kfree_skb(skb); 299 break; 300 } 301 } 302} 303 304static void ieee80211_restart_work(struct work_struct *work) 305{ 306 struct ieee80211_local *local = 307 container_of(work, struct ieee80211_local, restart_work); 308 309 /* wait for scan work complete */ 310 flush_workqueue(local->workqueue); 311 312 mutex_lock(&local->mtx); 313 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning), 314 "%s called with hardware scan in progress\n", __func__); 315 mutex_unlock(&local->mtx); 316 317 rtnl_lock(); 318 ieee80211_scan_cancel(local); 319 ieee80211_reconfig(local); 320 rtnl_unlock(); 321} 322 323void ieee80211_restart_hw(struct ieee80211_hw *hw) 324{ 325 struct ieee80211_local *local = hw_to_local(hw); 326 327 trace_api_restart_hw(local); 328 329 /* use this reason, ieee80211_reconfig will unblock it */ 330 ieee80211_stop_queues_by_reason(hw, 331 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 332 333 schedule_work(&local->restart_work); 334} 335EXPORT_SYMBOL(ieee80211_restart_hw); 336 337static void ieee80211_recalc_smps_work(struct work_struct *work) 338{ 339 struct ieee80211_local *local = 340 container_of(work, struct ieee80211_local, recalc_smps); 341 342 mutex_lock(&local->iflist_mtx); 343 ieee80211_recalc_smps(local); 344 mutex_unlock(&local->iflist_mtx); 345} 346 347#ifdef CONFIG_INET 348static int ieee80211_ifa_changed(struct notifier_block *nb, 349 unsigned long data, void *arg) 350{ 351 struct in_ifaddr *ifa = arg; 352 struct ieee80211_local *local = 353 container_of(nb, struct ieee80211_local, 354 ifa_notifier); 355 struct net_device *ndev = ifa->ifa_dev->dev; 356 struct wireless_dev *wdev = ndev->ieee80211_ptr; 357 struct in_device *idev; 358 struct ieee80211_sub_if_data *sdata; 359 struct ieee80211_bss_conf *bss_conf; 360 struct ieee80211_if_managed *ifmgd; 361 int c = 0; 362 363 /* Make sure it's our interface that got changed */ 364 if (!wdev) 365 return NOTIFY_DONE; 366 367 if (wdev->wiphy != local->hw.wiphy) 368 return NOTIFY_DONE; 369 370 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 371 bss_conf = &sdata->vif.bss_conf; 372 373 if (!ieee80211_sdata_running(sdata)) 374 return NOTIFY_DONE; 375 376 /* ARP filtering is only supported in managed mode */ 377 if (sdata->vif.type != NL80211_IFTYPE_STATION) 378 return NOTIFY_DONE; 379 380 idev = __in_dev_get_rtnl(sdata->dev); 381 if (!idev) 382 return NOTIFY_DONE; 383 384 ifmgd = &sdata->u.mgd; 385 mutex_lock(&ifmgd->mtx); 386 387 /* Copy the addresses to the bss_conf list */ 388 ifa = idev->ifa_list; 389 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) { 390 bss_conf->arp_addr_list[c] = ifa->ifa_address; 391 ifa = ifa->ifa_next; 392 c++; 393 } 394 395 /* If not all addresses fit the list, disable filtering */ 396 if (ifa) { 397 sdata->arp_filter_state = false; 398 c = 0; 399 } else { 400 sdata->arp_filter_state = true; 401 } 402 bss_conf->arp_addr_cnt = c; 403 404 /* Configure driver only if associated */ 405 if (ifmgd->associated) { 406 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 407 ieee80211_bss_info_change_notify(sdata, 408 BSS_CHANGED_ARP_FILTER); 409 } 410 411 mutex_unlock(&ifmgd->mtx); 412 413 return NOTIFY_DONE; 414} 415#endif 416 417static int ieee80211_napi_poll(struct napi_struct *napi, int budget) 418{ 419 struct ieee80211_local *local = 420 container_of(napi, struct ieee80211_local, napi); 421 422 return local->ops->napi_poll(&local->hw, budget); 423} 424 425void ieee80211_napi_schedule(struct ieee80211_hw *hw) 426{ 427 struct ieee80211_local *local = hw_to_local(hw); 428 429 napi_schedule(&local->napi); 430} 431EXPORT_SYMBOL(ieee80211_napi_schedule); 432 433void ieee80211_napi_complete(struct ieee80211_hw *hw) 434{ 435 struct ieee80211_local *local = hw_to_local(hw); 436 437 napi_complete(&local->napi); 438} 439EXPORT_SYMBOL(ieee80211_napi_complete); 440 441/* There isn't a lot of sense in it, but you can transmit anything you like */ 442static const struct ieee80211_txrx_stypes 443ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = { 444 [NL80211_IFTYPE_ADHOC] = { 445 .tx = 0xffff, 446 .rx = BIT(IEEE80211_STYPE_ACTION >> 4), 447 }, 448 [NL80211_IFTYPE_STATION] = { 449 .tx = 0xffff, 450 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 451 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 452 }, 453 [NL80211_IFTYPE_AP] = { 454 .tx = 0xffff, 455 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 456 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 457 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 458 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 459 BIT(IEEE80211_STYPE_AUTH >> 4) | 460 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 461 BIT(IEEE80211_STYPE_ACTION >> 4), 462 }, 463 [NL80211_IFTYPE_AP_VLAN] = { 464 /* copy AP */ 465 .tx = 0xffff, 466 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 467 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 468 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 469 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 470 BIT(IEEE80211_STYPE_AUTH >> 4) | 471 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 472 BIT(IEEE80211_STYPE_ACTION >> 4), 473 }, 474 [NL80211_IFTYPE_P2P_CLIENT] = { 475 .tx = 0xffff, 476 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 477 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 478 }, 479 [NL80211_IFTYPE_P2P_GO] = { 480 .tx = 0xffff, 481 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 482 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 483 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 484 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 485 BIT(IEEE80211_STYPE_AUTH >> 4) | 486 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 487 BIT(IEEE80211_STYPE_ACTION >> 4), 488 }, 489 [NL80211_IFTYPE_MESH_POINT] = { 490 .tx = 0xffff, 491 .rx = BIT(IEEE80211_STYPE_ACTION >> 4), 492 }, 493}; 494 495struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 496 const struct ieee80211_ops *ops) 497{ 498 struct ieee80211_local *local; 499 int priv_size, i; 500 struct wiphy *wiphy; 501 502 /* Ensure 32-byte alignment of our private data and hw private data. 503 * We use the wiphy priv data for both our ieee80211_local and for 504 * the driver's private data 505 * 506 * In memory it'll be like this: 507 * 508 * +-------------------------+ 509 * | struct wiphy | 510 * +-------------------------+ 511 * | struct ieee80211_local | 512 * +-------------------------+ 513 * | driver's private data | 514 * +-------------------------+ 515 * 516 */ 517 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; 518 519 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 520 521 if (!wiphy) 522 return NULL; 523 524 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes; 525 526 wiphy->privid = mac80211_wiphy_privid; 527 528 wiphy->flags |= WIPHY_FLAG_NETNS_OK | 529 WIPHY_FLAG_4ADDR_AP | 530 WIPHY_FLAG_4ADDR_STATION | 531 WIPHY_FLAG_SUPPORTS_SEPARATE_DEFAULT_KEYS; 532 533 if (!ops->set_key) 534 wiphy->flags |= WIPHY_FLAG_IBSS_RSN; 535 536 wiphy->bss_priv_size = sizeof(struct ieee80211_bss); 537 538 local = wiphy_priv(wiphy); 539 540 local->hw.wiphy = wiphy; 541 542 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 543 544 BUG_ON(!ops->tx); 545 BUG_ON(!ops->start); 546 BUG_ON(!ops->stop); 547 BUG_ON(!ops->config); 548 BUG_ON(!ops->add_interface); 549 BUG_ON(!ops->remove_interface); 550 BUG_ON(!ops->configure_filter); 551 local->ops = ops; 552 553 /* set up some defaults */ 554 local->hw.queues = 1; 555 local->hw.max_rates = 1; 556 local->hw.max_report_rates = 0; 557 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 558 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 559 local->user_power_level = -1; 560 local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES; 561 local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN; 562 563 INIT_LIST_HEAD(&local->interfaces); 564 565 __hw_addr_init(&local->mc_list); 566 567 mutex_init(&local->iflist_mtx); 568 mutex_init(&local->mtx); 569 570 mutex_init(&local->key_mtx); 571 spin_lock_init(&local->filter_lock); 572 spin_lock_init(&local->queue_stop_reason_lock); 573 574 /* 575 * The rx_skb_queue is only accessed from tasklets, 576 * but other SKB queues are used from within IRQ 577 * context. Therefore, this one needs a different 578 * locking class so our direct, non-irq-safe use of 579 * the queue's lock doesn't throw lockdep warnings. 580 */ 581 skb_queue_head_init_class(&local->rx_skb_queue, 582 &ieee80211_rx_skb_queue_class); 583 584 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 585 586 ieee80211_work_init(local); 587 588 INIT_WORK(&local->restart_work, ieee80211_restart_work); 589 590 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter); 591 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work); 592 local->smps_mode = IEEE80211_SMPS_OFF; 593 594 INIT_WORK(&local->dynamic_ps_enable_work, 595 ieee80211_dynamic_ps_enable_work); 596 INIT_WORK(&local->dynamic_ps_disable_work, 597 ieee80211_dynamic_ps_disable_work); 598 setup_timer(&local->dynamic_ps_timer, 599 ieee80211_dynamic_ps_timer, (unsigned long) local); 600 601 sta_info_init(local); 602 603 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 604 skb_queue_head_init(&local->pending[i]); 605 atomic_set(&local->agg_queue_stop[i], 0); 606 } 607 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 608 (unsigned long)local); 609 610 tasklet_init(&local->tasklet, 611 ieee80211_tasklet_handler, 612 (unsigned long) local); 613 614 skb_queue_head_init(&local->skb_queue); 615 skb_queue_head_init(&local->skb_queue_unreliable); 616 617 /* init dummy netdev for use w/ NAPI */ 618 init_dummy_netdev(&local->napi_dev); 619 620 ieee80211_led_names(local); 621 622 ieee80211_hw_roc_setup(local); 623 624 return local_to_hw(local); 625} 626EXPORT_SYMBOL(ieee80211_alloc_hw); 627 628int ieee80211_register_hw(struct ieee80211_hw *hw) 629{ 630 struct ieee80211_local *local = hw_to_local(hw); 631 int result; 632 enum ieee80211_band band; 633 int channels, max_bitrates; 634 bool supp_ht; 635 static const u32 cipher_suites[] = { 636 /* keep WEP first, it may be removed below */ 637 WLAN_CIPHER_SUITE_WEP40, 638 WLAN_CIPHER_SUITE_WEP104, 639 WLAN_CIPHER_SUITE_TKIP, 640 WLAN_CIPHER_SUITE_CCMP, 641 642 /* keep last -- depends on hw flags! */ 643 WLAN_CIPHER_SUITE_AES_CMAC 644 }; 645 646 if (hw->max_report_rates == 0) 647 hw->max_report_rates = hw->max_rates; 648 649 /* 650 * generic code guarantees at least one band, 651 * set this very early because much code assumes 652 * that hw.conf.channel is assigned 653 */ 654 channels = 0; 655 max_bitrates = 0; 656 supp_ht = false; 657 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 658 struct ieee80211_supported_band *sband; 659 660 sband = local->hw.wiphy->bands[band]; 661 if (!sband) 662 continue; 663 if (!local->oper_channel) { 664 /* init channel we're on */ 665 local->hw.conf.channel = 666 local->oper_channel = &sband->channels[0]; 667 local->hw.conf.channel_type = NL80211_CHAN_NO_HT; 668 } 669 channels += sband->n_channels; 670 671 if (max_bitrates < sband->n_bitrates) 672 max_bitrates = sband->n_bitrates; 673 supp_ht = supp_ht || sband->ht_cap.ht_supported; 674 } 675 676 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) + 677 sizeof(void *) * channels, GFP_KERNEL); 678 if (!local->int_scan_req) 679 return -ENOMEM; 680 681 /* if low-level driver supports AP, we also support VLAN */ 682 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) 683 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 684 685 /* mac80211 always supports monitor */ 686 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 687 688#ifndef CONFIG_MAC80211_MESH 689 /* mesh depends on Kconfig, but drivers should set it if they want */ 690 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT); 691#endif 692 693 /* mac80211 supports control port protocol changing */ 694 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL; 695 696 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 697 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 698 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 699 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 700 701 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) 702 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK), 703 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"); 704 705 /* 706 * Calculate scan IE length -- we need this to alloc 707 * memory and to subtract from the driver limit. It 708 * includes the DS Params, (extended) supported rates, and HT 709 * information -- SSID is the driver's responsibility. 710 */ 711 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ + 712 3 /* DS Params */; 713 if (supp_ht) 714 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 715 716 if (!local->ops->hw_scan) { 717 /* For hw_scan, driver needs to set these up. */ 718 local->hw.wiphy->max_scan_ssids = 4; 719 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 720 } 721 722 /* 723 * If the driver supports any scan IEs, then assume the 724 * limit includes the IEs mac80211 will add, otherwise 725 * leave it at zero and let the driver sort it out; we 726 * still pass our IEs to the driver but userspace will 727 * not be allowed to in that case. 728 */ 729 if (local->hw.wiphy->max_scan_ie_len) 730 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 731 732 /* Set up cipher suites unless driver already did */ 733 if (!local->hw.wiphy->cipher_suites) { 734 local->hw.wiphy->cipher_suites = cipher_suites; 735 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 736 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) 737 local->hw.wiphy->n_cipher_suites--; 738 } 739 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) { 740 if (local->hw.wiphy->cipher_suites == cipher_suites) { 741 local->hw.wiphy->cipher_suites += 2; 742 local->hw.wiphy->n_cipher_suites -= 2; 743 } else { 744 u32 *suites; 745 int r, w = 0; 746 747 /* Filter out WEP */ 748 749 suites = kmemdup( 750 local->hw.wiphy->cipher_suites, 751 sizeof(u32) * local->hw.wiphy->n_cipher_suites, 752 GFP_KERNEL); 753 if (!suites) 754 return -ENOMEM; 755 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) { 756 u32 suite = local->hw.wiphy->cipher_suites[r]; 757 if (suite == WLAN_CIPHER_SUITE_WEP40 || 758 suite == WLAN_CIPHER_SUITE_WEP104) 759 continue; 760 suites[w++] = suite; 761 } 762 local->hw.wiphy->cipher_suites = suites; 763 local->hw.wiphy->n_cipher_suites = w; 764 local->wiphy_ciphers_allocated = true; 765 } 766 } 767 768 if (!local->ops->remain_on_channel) 769 local->hw.wiphy->max_remain_on_channel_duration = 5000; 770 771 result = wiphy_register(local->hw.wiphy); 772 if (result < 0) 773 goto fail_wiphy_register; 774 775 /* 776 * We use the number of queues for feature tests (QoS, HT) internally 777 * so restrict them appropriately. 778 */ 779 if (hw->queues > IEEE80211_MAX_QUEUES) 780 hw->queues = IEEE80211_MAX_QUEUES; 781 782 local->workqueue = 783 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0); 784 if (!local->workqueue) { 785 result = -ENOMEM; 786 goto fail_workqueue; 787 } 788 789 /* 790 * The hardware needs headroom for sending the frame, 791 * and we need some headroom for passing the frame to monitor 792 * interfaces, but never both at the same time. 793 */ 794 BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM != 795 sizeof(struct ieee80211_tx_status_rtap_hdr)); 796 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 797 sizeof(struct ieee80211_tx_status_rtap_hdr)); 798 799 debugfs_hw_add(local); 800 801 /* 802 * if the driver doesn't specify a max listen interval we 803 * use 5 which should be a safe default 804 */ 805 if (local->hw.max_listen_interval == 0) 806 local->hw.max_listen_interval = 5; 807 808 local->hw.conf.listen_interval = local->hw.max_listen_interval; 809 810 local->dynamic_ps_forced_timeout = -1; 811 812 result = sta_info_start(local); 813 if (result < 0) 814 goto fail_sta_info; 815 816 result = ieee80211_wep_init(local); 817 if (result < 0) 818 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n", 819 result); 820 821 rtnl_lock(); 822 823 result = ieee80211_init_rate_ctrl_alg(local, 824 hw->rate_control_algorithm); 825 if (result < 0) { 826 wiphy_debug(local->hw.wiphy, 827 "Failed to initialize rate control algorithm\n"); 828 goto fail_rate; 829 } 830 831 /* add one default STA interface if supported */ 832 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 833 result = ieee80211_if_add(local, "wlan%d", NULL, 834 NL80211_IFTYPE_STATION, NULL); 835 if (result) 836 wiphy_warn(local->hw.wiphy, 837 "Failed to add default virtual iface\n"); 838 } 839 840 rtnl_unlock(); 841 842 ieee80211_led_init(local); 843 844 local->network_latency_notifier.notifier_call = 845 ieee80211_max_network_latency; 846 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 847 &local->network_latency_notifier); 848 if (result) { 849 rtnl_lock(); 850 goto fail_pm_qos; 851 } 852 853#ifdef CONFIG_INET 854 local->ifa_notifier.notifier_call = ieee80211_ifa_changed; 855 result = register_inetaddr_notifier(&local->ifa_notifier); 856 if (result) 857 goto fail_ifa; 858#endif 859 860 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll, 861 local->hw.napi_weight); 862 863 return 0; 864 865#ifdef CONFIG_INET 866 fail_ifa: 867 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 868 &local->network_latency_notifier); 869 rtnl_lock(); 870#endif 871 fail_pm_qos: 872 ieee80211_led_exit(local); 873 ieee80211_remove_interfaces(local); 874 fail_rate: 875 rtnl_unlock(); 876 ieee80211_wep_free(local); 877 sta_info_stop(local); 878 fail_sta_info: 879 destroy_workqueue(local->workqueue); 880 fail_workqueue: 881 wiphy_unregister(local->hw.wiphy); 882 fail_wiphy_register: 883 if (local->wiphy_ciphers_allocated) 884 kfree(local->hw.wiphy->cipher_suites); 885 kfree(local->int_scan_req); 886 return result; 887} 888EXPORT_SYMBOL(ieee80211_register_hw); 889 890void ieee80211_unregister_hw(struct ieee80211_hw *hw) 891{ 892 struct ieee80211_local *local = hw_to_local(hw); 893 894 tasklet_kill(&local->tx_pending_tasklet); 895 tasklet_kill(&local->tasklet); 896 897 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 898 &local->network_latency_notifier); 899#ifdef CONFIG_INET 900 unregister_inetaddr_notifier(&local->ifa_notifier); 901#endif 902 903 rtnl_lock(); 904 905 /* 906 * At this point, interface list manipulations are fine 907 * because the driver cannot be handing us frames any 908 * more and the tasklet is killed. 909 */ 910 ieee80211_remove_interfaces(local); 911 912 rtnl_unlock(); 913 914 /* 915 * Now all work items will be gone, but the 916 * timer might still be armed, so delete it 917 */ 918 del_timer_sync(&local->work_timer); 919 920 cancel_work_sync(&local->restart_work); 921 cancel_work_sync(&local->reconfig_filter); 922 923 ieee80211_clear_tx_pending(local); 924 sta_info_stop(local); 925 rate_control_deinitialize(local); 926 927 if (skb_queue_len(&local->skb_queue) || 928 skb_queue_len(&local->skb_queue_unreliable)) 929 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n"); 930 skb_queue_purge(&local->skb_queue); 931 skb_queue_purge(&local->skb_queue_unreliable); 932 skb_queue_purge(&local->rx_skb_queue); 933 934 destroy_workqueue(local->workqueue); 935 wiphy_unregister(local->hw.wiphy); 936 ieee80211_wep_free(local); 937 ieee80211_led_exit(local); 938 kfree(local->int_scan_req); 939} 940EXPORT_SYMBOL(ieee80211_unregister_hw); 941 942void ieee80211_free_hw(struct ieee80211_hw *hw) 943{ 944 struct ieee80211_local *local = hw_to_local(hw); 945 946 mutex_destroy(&local->iflist_mtx); 947 mutex_destroy(&local->mtx); 948 949 if (local->wiphy_ciphers_allocated) 950 kfree(local->hw.wiphy->cipher_suites); 951 952 wiphy_free(local->hw.wiphy); 953} 954EXPORT_SYMBOL(ieee80211_free_hw); 955 956static int __init ieee80211_init(void) 957{ 958 struct sk_buff *skb; 959 int ret; 960 961 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 962 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 963 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 964 965 ret = rc80211_minstrel_init(); 966 if (ret) 967 return ret; 968 969 ret = rc80211_minstrel_ht_init(); 970 if (ret) 971 goto err_minstrel; 972 973 ret = rc80211_pid_init(); 974 if (ret) 975 goto err_pid; 976 977 ret = ieee80211_iface_init(); 978 if (ret) 979 goto err_netdev; 980 981 return 0; 982 err_netdev: 983 rc80211_pid_exit(); 984 err_pid: 985 rc80211_minstrel_ht_exit(); 986 err_minstrel: 987 rc80211_minstrel_exit(); 988 989 return ret; 990} 991 992static void __exit ieee80211_exit(void) 993{ 994 rc80211_pid_exit(); 995 rc80211_minstrel_ht_exit(); 996 rc80211_minstrel_exit(); 997 998 if (mesh_allocated) 999 ieee80211s_stop(); 1000 1001 ieee80211_iface_exit(); 1002} 1003 1004 1005subsys_initcall(ieee80211_init); 1006module_exit(ieee80211_exit); 1007 1008MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1009MODULE_LICENSE("GPL"); 1010