main.c revision 59bdf3b0fe7a183f18ce94696259c4c76abb4568
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} 100 101/* 102 * Returns true if we are logically configured to be on 103 * the operating channel AND the hardware-conf is currently 104 * configured on the operating channel. Compares channel-type 105 * as well. 106 */ 107bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local) 108{ 109 struct ieee80211_channel *chan, *scan_chan; 110 enum nl80211_channel_type channel_type; 111 112 /* This logic needs to match logic in ieee80211_hw_config */ 113 if (local->scan_channel) { 114 chan = local->scan_channel; 115 /* If scanning on oper channel, use whatever channel-type 116 * is currently in use. 117 */ 118 if (chan == local->oper_channel) 119 channel_type = local->_oper_channel_type; 120 else 121 channel_type = NL80211_CHAN_NO_HT; 122 } else if (local->tmp_channel) { 123 chan = scan_chan = local->tmp_channel; 124 channel_type = local->tmp_channel_type; 125 } else { 126 chan = local->oper_channel; 127 channel_type = local->_oper_channel_type; 128 } 129 130 if (chan != local->oper_channel || 131 channel_type != local->_oper_channel_type) 132 return false; 133 134 /* Check current hardware-config against oper_channel. */ 135 if ((local->oper_channel != local->hw.conf.channel) || 136 (local->_oper_channel_type != local->hw.conf.channel_type)) 137 return false; 138 139 return true; 140} 141 142int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 143{ 144 struct ieee80211_channel *chan, *scan_chan; 145 int ret = 0; 146 int power; 147 enum nl80211_channel_type channel_type; 148 u32 offchannel_flag; 149 150 might_sleep(); 151 152 scan_chan = local->scan_channel; 153 154 /* If this off-channel logic ever changes, ieee80211_on_oper_channel 155 * may need to change as well. 156 */ 157 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 158 if (scan_chan) { 159 chan = scan_chan; 160 /* If scanning on oper channel, use whatever channel-type 161 * is currently in use. 162 */ 163 if (chan == local->oper_channel) 164 channel_type = local->_oper_channel_type; 165 else 166 channel_type = NL80211_CHAN_NO_HT; 167 } else if (local->tmp_channel) { 168 chan = scan_chan = local->tmp_channel; 169 channel_type = local->tmp_channel_type; 170 } else { 171 chan = local->oper_channel; 172 channel_type = local->_oper_channel_type; 173 } 174 175 if (chan != local->oper_channel || 176 channel_type != local->_oper_channel_type) 177 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL; 178 else 179 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL; 180 181 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 182 183 if (offchannel_flag || chan != local->hw.conf.channel || 184 channel_type != local->hw.conf.channel_type) { 185 local->hw.conf.channel = chan; 186 local->hw.conf.channel_type = channel_type; 187 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 188 } 189 190 if (!conf_is_ht(&local->hw.conf)) { 191 /* 192 * mac80211.h documents that this is only valid 193 * when the channel is set to an HT type, and 194 * that otherwise STATIC is used. 195 */ 196 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC; 197 } else if (local->hw.conf.smps_mode != local->smps_mode) { 198 local->hw.conf.smps_mode = local->smps_mode; 199 changed |= IEEE80211_CONF_CHANGE_SMPS; 200 } 201 202 if ((local->scanning & SCAN_SW_SCANNING) || 203 (local->scanning & SCAN_HW_SCANNING)) 204 power = chan->max_power; 205 else 206 power = local->power_constr_level ? 207 (chan->max_power - local->power_constr_level) : 208 chan->max_power; 209 210 if (local->user_power_level >= 0) 211 power = min(power, local->user_power_level); 212 213 if (local->hw.conf.power_level != power) { 214 changed |= IEEE80211_CONF_CHANGE_POWER; 215 local->hw.conf.power_level = power; 216 } 217 218 if (changed && local->open_count) { 219 ret = drv_config(local, changed); 220 /* 221 * Goal: 222 * HW reconfiguration should never fail, the driver has told 223 * us what it can support so it should live up to that promise. 224 * 225 * Current status: 226 * rfkill is not integrated with mac80211 and a 227 * configuration command can thus fail if hardware rfkill 228 * is enabled 229 * 230 * FIXME: integrate rfkill with mac80211 and then add this 231 * WARN_ON() back 232 * 233 */ 234 /* WARN_ON(ret); */ 235 } 236 237 return ret; 238} 239 240void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 241 u32 changed) 242{ 243 struct ieee80211_local *local = sdata->local; 244 static const u8 zero[ETH_ALEN] = { 0 }; 245 246 if (!changed) 247 return; 248 249 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 250 /* 251 * While not associated, claim a BSSID of all-zeroes 252 * so that drivers don't do any weird things with the 253 * BSSID at that time. 254 */ 255 if (sdata->vif.bss_conf.assoc) 256 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 257 else 258 sdata->vif.bss_conf.bssid = zero; 259 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 260 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 261 else if (sdata->vif.type == NL80211_IFTYPE_AP) 262 sdata->vif.bss_conf.bssid = sdata->vif.addr; 263 else if (sdata->vif.type == NL80211_IFTYPE_WDS) 264 sdata->vif.bss_conf.bssid = NULL; 265 else if (ieee80211_vif_is_mesh(&sdata->vif)) { 266 sdata->vif.bss_conf.bssid = zero; 267 } else { 268 WARN_ON(1); 269 return; 270 } 271 272 switch (sdata->vif.type) { 273 case NL80211_IFTYPE_AP: 274 case NL80211_IFTYPE_ADHOC: 275 case NL80211_IFTYPE_WDS: 276 case NL80211_IFTYPE_MESH_POINT: 277 break; 278 default: 279 /* do not warn to simplify caller in scan.c */ 280 changed &= ~BSS_CHANGED_BEACON_ENABLED; 281 if (WARN_ON(changed & BSS_CHANGED_BEACON)) 282 return; 283 break; 284 } 285 286 if (changed & BSS_CHANGED_BEACON_ENABLED) { 287 if (local->quiescing || !ieee80211_sdata_running(sdata) || 288 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) { 289 sdata->vif.bss_conf.enable_beacon = false; 290 } else { 291 /* 292 * Beacon should be enabled, but AP mode must 293 * check whether there is a beacon configured. 294 */ 295 switch (sdata->vif.type) { 296 case NL80211_IFTYPE_AP: 297 sdata->vif.bss_conf.enable_beacon = 298 !!sdata->u.ap.beacon; 299 break; 300 case NL80211_IFTYPE_ADHOC: 301 sdata->vif.bss_conf.enable_beacon = 302 !!sdata->u.ibss.presp; 303 break; 304#ifdef CONFIG_MAC80211_MESH 305 case NL80211_IFTYPE_MESH_POINT: 306 sdata->vif.bss_conf.enable_beacon = 307 !!sdata->u.mesh.mesh_id_len; 308 break; 309#endif 310 default: 311 /* not reached */ 312 WARN_ON(1); 313 break; 314 } 315 } 316 } 317 318 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed); 319} 320 321u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 322{ 323 sdata->vif.bss_conf.use_cts_prot = false; 324 sdata->vif.bss_conf.use_short_preamble = false; 325 sdata->vif.bss_conf.use_short_slot = false; 326 return BSS_CHANGED_ERP_CTS_PROT | 327 BSS_CHANGED_ERP_PREAMBLE | 328 BSS_CHANGED_ERP_SLOT; 329} 330 331static void ieee80211_tasklet_handler(unsigned long data) 332{ 333 struct ieee80211_local *local = (struct ieee80211_local *) data; 334 struct sk_buff *skb; 335 336 while ((skb = skb_dequeue(&local->skb_queue)) || 337 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 338 switch (skb->pkt_type) { 339 case IEEE80211_RX_MSG: 340 /* Clear skb->pkt_type in order to not confuse kernel 341 * netstack. */ 342 skb->pkt_type = 0; 343 ieee80211_rx(local_to_hw(local), skb); 344 break; 345 case IEEE80211_TX_STATUS_MSG: 346 skb->pkt_type = 0; 347 ieee80211_tx_status(local_to_hw(local), skb); 348 break; 349 default: 350 WARN(1, "mac80211: Packet is of unknown type %d\n", 351 skb->pkt_type); 352 dev_kfree_skb(skb); 353 break; 354 } 355 } 356} 357 358static void ieee80211_restart_work(struct work_struct *work) 359{ 360 struct ieee80211_local *local = 361 container_of(work, struct ieee80211_local, restart_work); 362 363 /* wait for scan work complete */ 364 flush_workqueue(local->workqueue); 365 366 mutex_lock(&local->mtx); 367 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning), 368 "%s called with hardware scan in progress\n", __func__); 369 mutex_unlock(&local->mtx); 370 371 rtnl_lock(); 372 ieee80211_scan_cancel(local); 373 ieee80211_reconfig(local); 374 rtnl_unlock(); 375} 376 377void ieee80211_restart_hw(struct ieee80211_hw *hw) 378{ 379 struct ieee80211_local *local = hw_to_local(hw); 380 381 trace_api_restart_hw(local); 382 383 /* use this reason, ieee80211_reconfig will unblock it */ 384 ieee80211_stop_queues_by_reason(hw, 385 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 386 387 schedule_work(&local->restart_work); 388} 389EXPORT_SYMBOL(ieee80211_restart_hw); 390 391static void ieee80211_recalc_smps_work(struct work_struct *work) 392{ 393 struct ieee80211_local *local = 394 container_of(work, struct ieee80211_local, recalc_smps); 395 396 mutex_lock(&local->iflist_mtx); 397 ieee80211_recalc_smps(local); 398 mutex_unlock(&local->iflist_mtx); 399} 400 401#ifdef CONFIG_INET 402static int ieee80211_ifa_changed(struct notifier_block *nb, 403 unsigned long data, void *arg) 404{ 405 struct in_ifaddr *ifa = arg; 406 struct ieee80211_local *local = 407 container_of(nb, struct ieee80211_local, 408 ifa_notifier); 409 struct net_device *ndev = ifa->ifa_dev->dev; 410 struct wireless_dev *wdev = ndev->ieee80211_ptr; 411 struct in_device *idev; 412 struct ieee80211_sub_if_data *sdata; 413 struct ieee80211_bss_conf *bss_conf; 414 struct ieee80211_if_managed *ifmgd; 415 int c = 0; 416 417 /* Make sure it's our interface that got changed */ 418 if (!wdev) 419 return NOTIFY_DONE; 420 421 if (wdev->wiphy != local->hw.wiphy) 422 return NOTIFY_DONE; 423 424 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 425 bss_conf = &sdata->vif.bss_conf; 426 427 if (!ieee80211_sdata_running(sdata)) 428 return NOTIFY_DONE; 429 430 /* ARP filtering is only supported in managed mode */ 431 if (sdata->vif.type != NL80211_IFTYPE_STATION) 432 return NOTIFY_DONE; 433 434 idev = __in_dev_get_rtnl(sdata->dev); 435 if (!idev) 436 return NOTIFY_DONE; 437 438 ifmgd = &sdata->u.mgd; 439 mutex_lock(&ifmgd->mtx); 440 441 /* Copy the addresses to the bss_conf list */ 442 ifa = idev->ifa_list; 443 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) { 444 bss_conf->arp_addr_list[c] = ifa->ifa_address; 445 ifa = ifa->ifa_next; 446 c++; 447 } 448 449 /* If not all addresses fit the list, disable filtering */ 450 if (ifa) { 451 sdata->arp_filter_state = false; 452 c = 0; 453 } else { 454 sdata->arp_filter_state = true; 455 } 456 bss_conf->arp_addr_cnt = c; 457 458 /* Configure driver only if associated */ 459 if (ifmgd->associated) { 460 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 461 ieee80211_bss_info_change_notify(sdata, 462 BSS_CHANGED_ARP_FILTER); 463 } 464 465 mutex_unlock(&ifmgd->mtx); 466 467 return NOTIFY_DONE; 468} 469#endif 470 471static int ieee80211_napi_poll(struct napi_struct *napi, int budget) 472{ 473 struct ieee80211_local *local = 474 container_of(napi, struct ieee80211_local, napi); 475 476 return local->ops->napi_poll(&local->hw, budget); 477} 478 479void ieee80211_napi_schedule(struct ieee80211_hw *hw) 480{ 481 struct ieee80211_local *local = hw_to_local(hw); 482 483 napi_schedule(&local->napi); 484} 485EXPORT_SYMBOL(ieee80211_napi_schedule); 486 487void ieee80211_napi_complete(struct ieee80211_hw *hw) 488{ 489 struct ieee80211_local *local = hw_to_local(hw); 490 491 napi_complete(&local->napi); 492} 493EXPORT_SYMBOL(ieee80211_napi_complete); 494 495/* There isn't a lot of sense in it, but you can transmit anything you like */ 496static const struct ieee80211_txrx_stypes 497ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = { 498 [NL80211_IFTYPE_ADHOC] = { 499 .tx = 0xffff, 500 .rx = BIT(IEEE80211_STYPE_ACTION >> 4), 501 }, 502 [NL80211_IFTYPE_STATION] = { 503 .tx = 0xffff, 504 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 505 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 506 }, 507 [NL80211_IFTYPE_AP] = { 508 .tx = 0xffff, 509 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 510 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 511 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 512 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 513 BIT(IEEE80211_STYPE_AUTH >> 4) | 514 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 515 BIT(IEEE80211_STYPE_ACTION >> 4), 516 }, 517 [NL80211_IFTYPE_AP_VLAN] = { 518 /* copy AP */ 519 .tx = 0xffff, 520 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 521 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 522 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 523 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 524 BIT(IEEE80211_STYPE_AUTH >> 4) | 525 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 526 BIT(IEEE80211_STYPE_ACTION >> 4), 527 }, 528 [NL80211_IFTYPE_P2P_CLIENT] = { 529 .tx = 0xffff, 530 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 531 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 532 }, 533 [NL80211_IFTYPE_P2P_GO] = { 534 .tx = 0xffff, 535 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 536 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 537 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 538 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 539 BIT(IEEE80211_STYPE_AUTH >> 4) | 540 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 541 BIT(IEEE80211_STYPE_ACTION >> 4), 542 }, 543 [NL80211_IFTYPE_MESH_POINT] = { 544 .tx = 0xffff, 545 .rx = BIT(IEEE80211_STYPE_ACTION >> 4), 546 }, 547}; 548 549struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 550 const struct ieee80211_ops *ops) 551{ 552 struct ieee80211_local *local; 553 int priv_size, i; 554 struct wiphy *wiphy; 555 556 /* Ensure 32-byte alignment of our private data and hw private data. 557 * We use the wiphy priv data for both our ieee80211_local and for 558 * the driver's private data 559 * 560 * In memory it'll be like this: 561 * 562 * +-------------------------+ 563 * | struct wiphy | 564 * +-------------------------+ 565 * | struct ieee80211_local | 566 * +-------------------------+ 567 * | driver's private data | 568 * +-------------------------+ 569 * 570 */ 571 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; 572 573 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 574 575 if (!wiphy) 576 return NULL; 577 578 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes; 579 580 wiphy->privid = mac80211_wiphy_privid; 581 582 wiphy->flags |= WIPHY_FLAG_NETNS_OK | 583 WIPHY_FLAG_4ADDR_AP | 584 WIPHY_FLAG_4ADDR_STATION | 585 WIPHY_FLAG_SUPPORTS_SEPARATE_DEFAULT_KEYS; 586 587 if (!ops->set_key) 588 wiphy->flags |= WIPHY_FLAG_IBSS_RSN; 589 590 wiphy->bss_priv_size = sizeof(struct ieee80211_bss); 591 592 local = wiphy_priv(wiphy); 593 594 local->hw.wiphy = wiphy; 595 596 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 597 598 BUG_ON(!ops->tx); 599 BUG_ON(!ops->start); 600 BUG_ON(!ops->stop); 601 BUG_ON(!ops->config); 602 BUG_ON(!ops->add_interface); 603 BUG_ON(!ops->remove_interface); 604 BUG_ON(!ops->configure_filter); 605 local->ops = ops; 606 607 /* set up some defaults */ 608 local->hw.queues = 1; 609 local->hw.max_rates = 1; 610 local->hw.max_report_rates = 0; 611 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 612 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 613 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 614 local->user_power_level = -1; 615 local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES; 616 local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN; 617 618 INIT_LIST_HEAD(&local->interfaces); 619 620 __hw_addr_init(&local->mc_list); 621 622 mutex_init(&local->iflist_mtx); 623 mutex_init(&local->mtx); 624 625 mutex_init(&local->key_mtx); 626 spin_lock_init(&local->filter_lock); 627 spin_lock_init(&local->queue_stop_reason_lock); 628 629 /* 630 * The rx_skb_queue is only accessed from tasklets, 631 * but other SKB queues are used from within IRQ 632 * context. Therefore, this one needs a different 633 * locking class so our direct, non-irq-safe use of 634 * the queue's lock doesn't throw lockdep warnings. 635 */ 636 skb_queue_head_init_class(&local->rx_skb_queue, 637 &ieee80211_rx_skb_queue_class); 638 639 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 640 641 ieee80211_work_init(local); 642 643 INIT_WORK(&local->restart_work, ieee80211_restart_work); 644 645 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter); 646 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work); 647 local->smps_mode = IEEE80211_SMPS_OFF; 648 649 INIT_WORK(&local->dynamic_ps_enable_work, 650 ieee80211_dynamic_ps_enable_work); 651 INIT_WORK(&local->dynamic_ps_disable_work, 652 ieee80211_dynamic_ps_disable_work); 653 setup_timer(&local->dynamic_ps_timer, 654 ieee80211_dynamic_ps_timer, (unsigned long) local); 655 656 sta_info_init(local); 657 658 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 659 skb_queue_head_init(&local->pending[i]); 660 atomic_set(&local->agg_queue_stop[i], 0); 661 } 662 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 663 (unsigned long)local); 664 665 tasklet_init(&local->tasklet, 666 ieee80211_tasklet_handler, 667 (unsigned long) local); 668 669 skb_queue_head_init(&local->skb_queue); 670 skb_queue_head_init(&local->skb_queue_unreliable); 671 672 /* init dummy netdev for use w/ NAPI */ 673 init_dummy_netdev(&local->napi_dev); 674 675 ieee80211_led_names(local); 676 677 ieee80211_hw_roc_setup(local); 678 679 return local_to_hw(local); 680} 681EXPORT_SYMBOL(ieee80211_alloc_hw); 682 683int ieee80211_register_hw(struct ieee80211_hw *hw) 684{ 685 struct ieee80211_local *local = hw_to_local(hw); 686 int result; 687 enum ieee80211_band band; 688 int channels, max_bitrates; 689 bool supp_ht; 690 static const u32 cipher_suites[] = { 691 /* keep WEP first, it may be removed below */ 692 WLAN_CIPHER_SUITE_WEP40, 693 WLAN_CIPHER_SUITE_WEP104, 694 WLAN_CIPHER_SUITE_TKIP, 695 WLAN_CIPHER_SUITE_CCMP, 696 697 /* keep last -- depends on hw flags! */ 698 WLAN_CIPHER_SUITE_AES_CMAC 699 }; 700 701 if (hw->max_report_rates == 0) 702 hw->max_report_rates = hw->max_rates; 703 704 /* 705 * generic code guarantees at least one band, 706 * set this very early because much code assumes 707 * that hw.conf.channel is assigned 708 */ 709 channels = 0; 710 max_bitrates = 0; 711 supp_ht = false; 712 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 713 struct ieee80211_supported_band *sband; 714 715 sband = local->hw.wiphy->bands[band]; 716 if (!sband) 717 continue; 718 if (!local->oper_channel) { 719 /* init channel we're on */ 720 local->hw.conf.channel = 721 local->oper_channel = &sband->channels[0]; 722 local->hw.conf.channel_type = NL80211_CHAN_NO_HT; 723 } 724 channels += sband->n_channels; 725 726 if (max_bitrates < sband->n_bitrates) 727 max_bitrates = sband->n_bitrates; 728 supp_ht = supp_ht || sband->ht_cap.ht_supported; 729 } 730 731 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) + 732 sizeof(void *) * channels, GFP_KERNEL); 733 if (!local->int_scan_req) 734 return -ENOMEM; 735 736 /* if low-level driver supports AP, we also support VLAN */ 737 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) 738 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 739 740 /* mac80211 always supports monitor */ 741 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 742 743#ifndef CONFIG_MAC80211_MESH 744 /* mesh depends on Kconfig, but drivers should set it if they want */ 745 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT); 746#endif 747 748 /* mac80211 supports control port protocol changing */ 749 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL; 750 751 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 752 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 753 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 754 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 755 756 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) 757 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK), 758 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"); 759 760 /* 761 * Calculate scan IE length -- we need this to alloc 762 * memory and to subtract from the driver limit. It 763 * includes the DS Params, (extended) supported rates, and HT 764 * information -- SSID is the driver's responsibility. 765 */ 766 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ + 767 3 /* DS Params */; 768 if (supp_ht) 769 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 770 771 if (!local->ops->hw_scan) { 772 /* For hw_scan, driver needs to set these up. */ 773 local->hw.wiphy->max_scan_ssids = 4; 774 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 775 } 776 777 /* 778 * If the driver supports any scan IEs, then assume the 779 * limit includes the IEs mac80211 will add, otherwise 780 * leave it at zero and let the driver sort it out; we 781 * still pass our IEs to the driver but userspace will 782 * not be allowed to in that case. 783 */ 784 if (local->hw.wiphy->max_scan_ie_len) 785 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 786 787 /* Set up cipher suites unless driver already did */ 788 if (!local->hw.wiphy->cipher_suites) { 789 local->hw.wiphy->cipher_suites = cipher_suites; 790 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 791 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) 792 local->hw.wiphy->n_cipher_suites--; 793 } 794 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) { 795 if (local->hw.wiphy->cipher_suites == cipher_suites) { 796 local->hw.wiphy->cipher_suites += 2; 797 local->hw.wiphy->n_cipher_suites -= 2; 798 } else { 799 u32 *suites; 800 int r, w = 0; 801 802 /* Filter out WEP */ 803 804 suites = kmemdup( 805 local->hw.wiphy->cipher_suites, 806 sizeof(u32) * local->hw.wiphy->n_cipher_suites, 807 GFP_KERNEL); 808 if (!suites) 809 return -ENOMEM; 810 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) { 811 u32 suite = local->hw.wiphy->cipher_suites[r]; 812 if (suite == WLAN_CIPHER_SUITE_WEP40 || 813 suite == WLAN_CIPHER_SUITE_WEP104) 814 continue; 815 suites[w++] = suite; 816 } 817 local->hw.wiphy->cipher_suites = suites; 818 local->hw.wiphy->n_cipher_suites = w; 819 local->wiphy_ciphers_allocated = true; 820 } 821 } 822 823 if (!local->ops->remain_on_channel) 824 local->hw.wiphy->max_remain_on_channel_duration = 5000; 825 826 result = wiphy_register(local->hw.wiphy); 827 if (result < 0) 828 goto fail_wiphy_register; 829 830 /* 831 * We use the number of queues for feature tests (QoS, HT) internally 832 * so restrict them appropriately. 833 */ 834 if (hw->queues > IEEE80211_MAX_QUEUES) 835 hw->queues = IEEE80211_MAX_QUEUES; 836 837 local->workqueue = 838 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0); 839 if (!local->workqueue) { 840 result = -ENOMEM; 841 goto fail_workqueue; 842 } 843 844 /* 845 * The hardware needs headroom for sending the frame, 846 * and we need some headroom for passing the frame to monitor 847 * interfaces, but never both at the same time. 848 */ 849 BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM != 850 sizeof(struct ieee80211_tx_status_rtap_hdr)); 851 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 852 sizeof(struct ieee80211_tx_status_rtap_hdr)); 853 854 debugfs_hw_add(local); 855 856 /* 857 * if the driver doesn't specify a max listen interval we 858 * use 5 which should be a safe default 859 */ 860 if (local->hw.max_listen_interval == 0) 861 local->hw.max_listen_interval = 5; 862 863 local->hw.conf.listen_interval = local->hw.max_listen_interval; 864 865 local->dynamic_ps_forced_timeout = -1; 866 867 result = sta_info_start(local); 868 if (result < 0) 869 goto fail_sta_info; 870 871 result = ieee80211_wep_init(local); 872 if (result < 0) 873 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n", 874 result); 875 876 rtnl_lock(); 877 878 result = ieee80211_init_rate_ctrl_alg(local, 879 hw->rate_control_algorithm); 880 if (result < 0) { 881 wiphy_debug(local->hw.wiphy, 882 "Failed to initialize rate control algorithm\n"); 883 goto fail_rate; 884 } 885 886 /* add one default STA interface if supported */ 887 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 888 result = ieee80211_if_add(local, "wlan%d", NULL, 889 NL80211_IFTYPE_STATION, NULL); 890 if (result) 891 wiphy_warn(local->hw.wiphy, 892 "Failed to add default virtual iface\n"); 893 } 894 895 rtnl_unlock(); 896 897 ieee80211_led_init(local); 898 899 local->network_latency_notifier.notifier_call = 900 ieee80211_max_network_latency; 901 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 902 &local->network_latency_notifier); 903 if (result) { 904 rtnl_lock(); 905 goto fail_pm_qos; 906 } 907 908#ifdef CONFIG_INET 909 local->ifa_notifier.notifier_call = ieee80211_ifa_changed; 910 result = register_inetaddr_notifier(&local->ifa_notifier); 911 if (result) 912 goto fail_ifa; 913#endif 914 915 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll, 916 local->hw.napi_weight); 917 918 return 0; 919 920#ifdef CONFIG_INET 921 fail_ifa: 922 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 923 &local->network_latency_notifier); 924 rtnl_lock(); 925#endif 926 fail_pm_qos: 927 ieee80211_led_exit(local); 928 ieee80211_remove_interfaces(local); 929 fail_rate: 930 rtnl_unlock(); 931 ieee80211_wep_free(local); 932 sta_info_stop(local); 933 fail_sta_info: 934 destroy_workqueue(local->workqueue); 935 fail_workqueue: 936 wiphy_unregister(local->hw.wiphy); 937 fail_wiphy_register: 938 if (local->wiphy_ciphers_allocated) 939 kfree(local->hw.wiphy->cipher_suites); 940 kfree(local->int_scan_req); 941 return result; 942} 943EXPORT_SYMBOL(ieee80211_register_hw); 944 945void ieee80211_unregister_hw(struct ieee80211_hw *hw) 946{ 947 struct ieee80211_local *local = hw_to_local(hw); 948 949 tasklet_kill(&local->tx_pending_tasklet); 950 tasklet_kill(&local->tasklet); 951 952 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 953 &local->network_latency_notifier); 954#ifdef CONFIG_INET 955 unregister_inetaddr_notifier(&local->ifa_notifier); 956#endif 957 958 rtnl_lock(); 959 960 /* 961 * At this point, interface list manipulations are fine 962 * because the driver cannot be handing us frames any 963 * more and the tasklet is killed. 964 */ 965 ieee80211_remove_interfaces(local); 966 967 rtnl_unlock(); 968 969 /* 970 * Now all work items will be gone, but the 971 * timer might still be armed, so delete it 972 */ 973 del_timer_sync(&local->work_timer); 974 975 cancel_work_sync(&local->restart_work); 976 cancel_work_sync(&local->reconfig_filter); 977 978 ieee80211_clear_tx_pending(local); 979 sta_info_stop(local); 980 rate_control_deinitialize(local); 981 982 if (skb_queue_len(&local->skb_queue) || 983 skb_queue_len(&local->skb_queue_unreliable)) 984 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n"); 985 skb_queue_purge(&local->skb_queue); 986 skb_queue_purge(&local->skb_queue_unreliable); 987 skb_queue_purge(&local->rx_skb_queue); 988 989 destroy_workqueue(local->workqueue); 990 wiphy_unregister(local->hw.wiphy); 991 ieee80211_wep_free(local); 992 ieee80211_led_exit(local); 993 kfree(local->int_scan_req); 994} 995EXPORT_SYMBOL(ieee80211_unregister_hw); 996 997void ieee80211_free_hw(struct ieee80211_hw *hw) 998{ 999 struct ieee80211_local *local = hw_to_local(hw); 1000 1001 mutex_destroy(&local->iflist_mtx); 1002 mutex_destroy(&local->mtx); 1003 1004 if (local->wiphy_ciphers_allocated) 1005 kfree(local->hw.wiphy->cipher_suites); 1006 1007 wiphy_free(local->hw.wiphy); 1008} 1009EXPORT_SYMBOL(ieee80211_free_hw); 1010 1011static int __init ieee80211_init(void) 1012{ 1013 struct sk_buff *skb; 1014 int ret; 1015 1016 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1017 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1018 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1019 1020 ret = rc80211_minstrel_init(); 1021 if (ret) 1022 return ret; 1023 1024 ret = rc80211_minstrel_ht_init(); 1025 if (ret) 1026 goto err_minstrel; 1027 1028 ret = rc80211_pid_init(); 1029 if (ret) 1030 goto err_pid; 1031 1032 ret = ieee80211_iface_init(); 1033 if (ret) 1034 goto err_netdev; 1035 1036 return 0; 1037 err_netdev: 1038 rc80211_pid_exit(); 1039 err_pid: 1040 rc80211_minstrel_ht_exit(); 1041 err_minstrel: 1042 rc80211_minstrel_exit(); 1043 1044 return ret; 1045} 1046 1047static void __exit ieee80211_exit(void) 1048{ 1049 rc80211_pid_exit(); 1050 rc80211_minstrel_ht_exit(); 1051 rc80211_minstrel_exit(); 1052 1053 if (mesh_allocated) 1054 ieee80211s_stop(); 1055 1056 ieee80211_iface_exit(); 1057} 1058 1059 1060subsys_initcall(ieee80211_init); 1061module_exit(ieee80211_exit); 1062 1063MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1064MODULE_LICENSE("GPL"); 1065