main.c revision 7c4ef7122cef54dc49562eea35cbfaf0f44faa0b
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.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 36static struct lock_class_key ieee80211_rx_skb_queue_class; 37 38void ieee80211_configure_filter(struct ieee80211_local *local) 39{ 40 u64 mc; 41 unsigned int changed_flags; 42 unsigned int new_flags = 0; 43 44 if (atomic_read(&local->iff_promiscs)) 45 new_flags |= FIF_PROMISC_IN_BSS; 46 47 if (atomic_read(&local->iff_allmultis)) 48 new_flags |= FIF_ALLMULTI; 49 50 if (local->monitors || local->scanning) 51 new_flags |= FIF_BCN_PRBRESP_PROMISC; 52 53 if (local->fif_probe_req || local->probe_req_reg) 54 new_flags |= FIF_PROBE_REQ; 55 56 if (local->fif_fcsfail) 57 new_flags |= FIF_FCSFAIL; 58 59 if (local->fif_plcpfail) 60 new_flags |= FIF_PLCPFAIL; 61 62 if (local->fif_control) 63 new_flags |= FIF_CONTROL; 64 65 if (local->fif_other_bss) 66 new_flags |= FIF_OTHER_BSS; 67 68 if (local->fif_pspoll) 69 new_flags |= FIF_PSPOLL; 70 71 spin_lock_bh(&local->filter_lock); 72 changed_flags = local->filter_flags ^ new_flags; 73 74 mc = drv_prepare_multicast(local, &local->mc_list); 75 spin_unlock_bh(&local->filter_lock); 76 77 /* be a bit nasty */ 78 new_flags |= (1<<31); 79 80 drv_configure_filter(local, changed_flags, &new_flags, mc); 81 82 WARN_ON(new_flags & (1<<31)); 83 84 local->filter_flags = new_flags & ~(1<<31); 85} 86 87static void ieee80211_reconfig_filter(struct work_struct *work) 88{ 89 struct ieee80211_local *local = 90 container_of(work, struct ieee80211_local, reconfig_filter); 91 92 ieee80211_configure_filter(local); 93} 94 95/* 96 * Returns true if we are logically configured to be on 97 * the operating channel AND the hardware-conf is currently 98 * configured on the operating channel. Compares channel-type 99 * as well. 100 */ 101bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local) 102{ 103 struct ieee80211_channel *chan; 104 enum nl80211_channel_type channel_type; 105 106 /* This logic needs to match logic in ieee80211_hw_config */ 107 if (local->scan_channel) { 108 chan = local->scan_channel; 109 /* If scanning on oper channel, use whatever channel-type 110 * is currently in use. 111 */ 112 if (chan == local->oper_channel) 113 channel_type = local->_oper_channel_type; 114 else 115 channel_type = NL80211_CHAN_NO_HT; 116 } else if (local->tmp_channel) { 117 chan = local->tmp_channel; 118 channel_type = local->tmp_channel_type; 119 } else { 120 chan = local->oper_channel; 121 channel_type = local->_oper_channel_type; 122 } 123 124 if (chan != local->oper_channel || 125 channel_type != local->_oper_channel_type) 126 return false; 127 128 /* Check current hardware-config against oper_channel. */ 129 if (local->oper_channel != local->hw.conf.channel || 130 local->_oper_channel_type != local->hw.conf.channel_type) 131 return false; 132 133 return true; 134} 135 136int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 137{ 138 struct ieee80211_channel *chan; 139 int ret = 0; 140 int power; 141 enum nl80211_channel_type channel_type; 142 u32 offchannel_flag; 143 144 might_sleep(); 145 146 /* If this off-channel logic ever changes, ieee80211_on_oper_channel 147 * may need to change as well. 148 */ 149 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 150 if (local->scan_channel) { 151 chan = local->scan_channel; 152 /* If scanning on oper channel, use whatever channel-type 153 * is currently in use. 154 */ 155 if (chan == local->oper_channel) 156 channel_type = local->_oper_channel_type; 157 else 158 channel_type = NL80211_CHAN_NO_HT; 159 } else if (local->tmp_channel) { 160 chan = local->tmp_channel; 161 channel_type = local->tmp_channel_type; 162 } else { 163 chan = local->oper_channel; 164 channel_type = local->_oper_channel_type; 165 } 166 167 if (chan != local->oper_channel || 168 channel_type != local->_oper_channel_type) 169 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL; 170 else 171 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL; 172 173 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 174 175 if (offchannel_flag || chan != local->hw.conf.channel || 176 channel_type != local->hw.conf.channel_type) { 177 local->hw.conf.channel = chan; 178 local->hw.conf.channel_type = channel_type; 179 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 180 } 181 182 if (!conf_is_ht(&local->hw.conf)) { 183 /* 184 * mac80211.h documents that this is only valid 185 * when the channel is set to an HT type, and 186 * that otherwise STATIC is used. 187 */ 188 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC; 189 } else if (local->hw.conf.smps_mode != local->smps_mode) { 190 local->hw.conf.smps_mode = local->smps_mode; 191 changed |= IEEE80211_CONF_CHANGE_SMPS; 192 } 193 194 if ((local->scanning & SCAN_SW_SCANNING) || 195 (local->scanning & SCAN_HW_SCANNING)) 196 power = chan->max_power; 197 else 198 power = local->power_constr_level ? 199 (chan->max_power - local->power_constr_level) : 200 chan->max_power; 201 202 if (local->user_power_level >= 0) 203 power = min(power, local->user_power_level); 204 205 if (local->hw.conf.power_level != power) { 206 changed |= IEEE80211_CONF_CHANGE_POWER; 207 local->hw.conf.power_level = power; 208 } 209 210 if (changed && local->open_count) { 211 ret = drv_config(local, changed); 212 /* 213 * Goal: 214 * HW reconfiguration should never fail, the driver has told 215 * us what it can support so it should live up to that promise. 216 * 217 * Current status: 218 * rfkill is not integrated with mac80211 and a 219 * configuration command can thus fail if hardware rfkill 220 * is enabled 221 * 222 * FIXME: integrate rfkill with mac80211 and then add this 223 * WARN_ON() back 224 * 225 */ 226 /* WARN_ON(ret); */ 227 } 228 229 return ret; 230} 231 232void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 233 u32 changed) 234{ 235 struct ieee80211_local *local = sdata->local; 236 static const u8 zero[ETH_ALEN] = { 0 }; 237 238 if (!changed) 239 return; 240 241 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 242 /* 243 * While not associated, claim a BSSID of all-zeroes 244 * so that drivers don't do any weird things with the 245 * BSSID at that time. 246 */ 247 if (sdata->vif.bss_conf.assoc) 248 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 249 else 250 sdata->vif.bss_conf.bssid = zero; 251 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 252 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 253 else if (sdata->vif.type == NL80211_IFTYPE_AP) 254 sdata->vif.bss_conf.bssid = sdata->vif.addr; 255 else if (sdata->vif.type == NL80211_IFTYPE_WDS) 256 sdata->vif.bss_conf.bssid = NULL; 257 else if (ieee80211_vif_is_mesh(&sdata->vif)) { 258 sdata->vif.bss_conf.bssid = zero; 259 } else { 260 WARN_ON(1); 261 return; 262 } 263 264 switch (sdata->vif.type) { 265 case NL80211_IFTYPE_AP: 266 case NL80211_IFTYPE_ADHOC: 267 case NL80211_IFTYPE_WDS: 268 case NL80211_IFTYPE_MESH_POINT: 269 break; 270 default: 271 /* do not warn to simplify caller in scan.c */ 272 changed &= ~BSS_CHANGED_BEACON_ENABLED; 273 if (WARN_ON(changed & BSS_CHANGED_BEACON)) 274 return; 275 break; 276 } 277 278 if (changed & BSS_CHANGED_BEACON_ENABLED) { 279 if (local->quiescing || !ieee80211_sdata_running(sdata) || 280 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) { 281 sdata->vif.bss_conf.enable_beacon = false; 282 } else { 283 /* 284 * Beacon should be enabled, but AP mode must 285 * check whether there is a beacon configured. 286 */ 287 switch (sdata->vif.type) { 288 case NL80211_IFTYPE_AP: 289 sdata->vif.bss_conf.enable_beacon = 290 !!sdata->u.ap.beacon; 291 break; 292 case NL80211_IFTYPE_ADHOC: 293 sdata->vif.bss_conf.enable_beacon = 294 !!sdata->u.ibss.presp; 295 break; 296#ifdef CONFIG_MAC80211_MESH 297 case NL80211_IFTYPE_MESH_POINT: 298 sdata->vif.bss_conf.enable_beacon = 299 !!sdata->u.mesh.mesh_id_len; 300 break; 301#endif 302 default: 303 /* not reached */ 304 WARN_ON(1); 305 break; 306 } 307 } 308 } 309 310 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed); 311} 312 313u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 314{ 315 sdata->vif.bss_conf.use_cts_prot = false; 316 sdata->vif.bss_conf.use_short_preamble = false; 317 sdata->vif.bss_conf.use_short_slot = false; 318 return BSS_CHANGED_ERP_CTS_PROT | 319 BSS_CHANGED_ERP_PREAMBLE | 320 BSS_CHANGED_ERP_SLOT; 321} 322 323static void ieee80211_tasklet_handler(unsigned long data) 324{ 325 struct ieee80211_local *local = (struct ieee80211_local *) data; 326 struct sta_info *sta, *tmp; 327 struct skb_eosp_msg_data *eosp_data; 328 struct sk_buff *skb; 329 330 while ((skb = skb_dequeue(&local->skb_queue)) || 331 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 332 switch (skb->pkt_type) { 333 case IEEE80211_RX_MSG: 334 /* Clear skb->pkt_type in order to not confuse kernel 335 * netstack. */ 336 skb->pkt_type = 0; 337 ieee80211_rx(local_to_hw(local), skb); 338 break; 339 case IEEE80211_TX_STATUS_MSG: 340 skb->pkt_type = 0; 341 ieee80211_tx_status(local_to_hw(local), skb); 342 break; 343 case IEEE80211_EOSP_MSG: 344 eosp_data = (void *)skb->cb; 345 for_each_sta_info(local, eosp_data->sta, sta, tmp) { 346 /* skip wrong virtual interface */ 347 if (memcmp(eosp_data->iface, 348 sta->sdata->vif.addr, ETH_ALEN)) 349 continue; 350 clear_sta_flag(sta, WLAN_STA_SP); 351 break; 352 } 353 dev_kfree_skb(skb); 354 break; 355 default: 356 WARN(1, "mac80211: Packet is of unknown type %d\n", 357 skb->pkt_type); 358 dev_kfree_skb(skb); 359 break; 360 } 361 } 362} 363 364static void ieee80211_restart_work(struct work_struct *work) 365{ 366 struct ieee80211_local *local = 367 container_of(work, struct ieee80211_local, restart_work); 368 369 /* wait for scan work complete */ 370 flush_workqueue(local->workqueue); 371 372 mutex_lock(&local->mtx); 373 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) || 374 local->sched_scanning, 375 "%s called with hardware scan in progress\n", __func__); 376 mutex_unlock(&local->mtx); 377 378 rtnl_lock(); 379 ieee80211_scan_cancel(local); 380 ieee80211_reconfig(local); 381 rtnl_unlock(); 382} 383 384void ieee80211_restart_hw(struct ieee80211_hw *hw) 385{ 386 struct ieee80211_local *local = hw_to_local(hw); 387 388 trace_api_restart_hw(local); 389 390 wiphy_info(hw->wiphy, 391 "Hardware restart was requested\n"); 392 393 /* use this reason, ieee80211_reconfig will unblock it */ 394 ieee80211_stop_queues_by_reason(hw, 395 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 396 397 schedule_work(&local->restart_work); 398} 399EXPORT_SYMBOL(ieee80211_restart_hw); 400 401static void ieee80211_recalc_smps_work(struct work_struct *work) 402{ 403 struct ieee80211_local *local = 404 container_of(work, struct ieee80211_local, recalc_smps); 405 406 mutex_lock(&local->iflist_mtx); 407 ieee80211_recalc_smps(local); 408 mutex_unlock(&local->iflist_mtx); 409} 410 411#ifdef CONFIG_INET 412static int ieee80211_ifa_changed(struct notifier_block *nb, 413 unsigned long data, void *arg) 414{ 415 struct in_ifaddr *ifa = arg; 416 struct ieee80211_local *local = 417 container_of(nb, struct ieee80211_local, 418 ifa_notifier); 419 struct net_device *ndev = ifa->ifa_dev->dev; 420 struct wireless_dev *wdev = ndev->ieee80211_ptr; 421 struct in_device *idev; 422 struct ieee80211_sub_if_data *sdata; 423 struct ieee80211_bss_conf *bss_conf; 424 struct ieee80211_if_managed *ifmgd; 425 int c = 0; 426 427 /* Make sure it's our interface that got changed */ 428 if (!wdev) 429 return NOTIFY_DONE; 430 431 if (wdev->wiphy != local->hw.wiphy) 432 return NOTIFY_DONE; 433 434 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 435 bss_conf = &sdata->vif.bss_conf; 436 437 if (!ieee80211_sdata_running(sdata)) 438 return NOTIFY_DONE; 439 440 /* ARP filtering is only supported in managed mode */ 441 if (sdata->vif.type != NL80211_IFTYPE_STATION) 442 return NOTIFY_DONE; 443 444 idev = __in_dev_get_rtnl(sdata->dev); 445 if (!idev) 446 return NOTIFY_DONE; 447 448 ifmgd = &sdata->u.mgd; 449 mutex_lock(&ifmgd->mtx); 450 451 /* Copy the addresses to the bss_conf list */ 452 ifa = idev->ifa_list; 453 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) { 454 bss_conf->arp_addr_list[c] = ifa->ifa_address; 455 ifa = ifa->ifa_next; 456 c++; 457 } 458 459 /* If not all addresses fit the list, disable filtering */ 460 if (ifa) { 461 sdata->arp_filter_state = false; 462 c = 0; 463 } else { 464 sdata->arp_filter_state = true; 465 } 466 bss_conf->arp_addr_cnt = c; 467 468 /* Configure driver only if associated */ 469 if (ifmgd->associated) { 470 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 471 ieee80211_bss_info_change_notify(sdata, 472 BSS_CHANGED_ARP_FILTER); 473 } 474 475 mutex_unlock(&ifmgd->mtx); 476 477 return NOTIFY_DONE; 478} 479#endif 480 481static int ieee80211_napi_poll(struct napi_struct *napi, int budget) 482{ 483 struct ieee80211_local *local = 484 container_of(napi, struct ieee80211_local, napi); 485 486 return local->ops->napi_poll(&local->hw, budget); 487} 488 489void ieee80211_napi_schedule(struct ieee80211_hw *hw) 490{ 491 struct ieee80211_local *local = hw_to_local(hw); 492 493 napi_schedule(&local->napi); 494} 495EXPORT_SYMBOL(ieee80211_napi_schedule); 496 497void ieee80211_napi_complete(struct ieee80211_hw *hw) 498{ 499 struct ieee80211_local *local = hw_to_local(hw); 500 501 napi_complete(&local->napi); 502} 503EXPORT_SYMBOL(ieee80211_napi_complete); 504 505/* There isn't a lot of sense in it, but you can transmit anything you like */ 506static const struct ieee80211_txrx_stypes 507ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = { 508 [NL80211_IFTYPE_ADHOC] = { 509 .tx = 0xffff, 510 .rx = BIT(IEEE80211_STYPE_ACTION >> 4), 511 }, 512 [NL80211_IFTYPE_STATION] = { 513 .tx = 0xffff, 514 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 515 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 516 }, 517 [NL80211_IFTYPE_AP] = { 518 .tx = 0xffff, 519 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 520 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 521 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 522 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 523 BIT(IEEE80211_STYPE_AUTH >> 4) | 524 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 525 BIT(IEEE80211_STYPE_ACTION >> 4), 526 }, 527 [NL80211_IFTYPE_AP_VLAN] = { 528 /* copy AP */ 529 .tx = 0xffff, 530 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 531 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 532 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 533 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 534 BIT(IEEE80211_STYPE_AUTH >> 4) | 535 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 536 BIT(IEEE80211_STYPE_ACTION >> 4), 537 }, 538 [NL80211_IFTYPE_P2P_CLIENT] = { 539 .tx = 0xffff, 540 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 541 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 542 }, 543 [NL80211_IFTYPE_P2P_GO] = { 544 .tx = 0xffff, 545 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 546 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 547 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 548 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 549 BIT(IEEE80211_STYPE_AUTH >> 4) | 550 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 551 BIT(IEEE80211_STYPE_ACTION >> 4), 552 }, 553 [NL80211_IFTYPE_MESH_POINT] = { 554 .tx = 0xffff, 555 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 556 BIT(IEEE80211_STYPE_AUTH >> 4) | 557 BIT(IEEE80211_STYPE_DEAUTH >> 4), 558 }, 559}; 560 561struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 562 const struct ieee80211_ops *ops) 563{ 564 struct ieee80211_local *local; 565 int priv_size, i; 566 struct wiphy *wiphy; 567 568 /* Ensure 32-byte alignment of our private data and hw private data. 569 * We use the wiphy priv data for both our ieee80211_local and for 570 * the driver's private data 571 * 572 * In memory it'll be like this: 573 * 574 * +-------------------------+ 575 * | struct wiphy | 576 * +-------------------------+ 577 * | struct ieee80211_local | 578 * +-------------------------+ 579 * | driver's private data | 580 * +-------------------------+ 581 * 582 */ 583 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; 584 585 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 586 587 if (!wiphy) 588 return NULL; 589 590 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes; 591 592 wiphy->privid = mac80211_wiphy_privid; 593 594 wiphy->flags |= WIPHY_FLAG_NETNS_OK | 595 WIPHY_FLAG_4ADDR_AP | 596 WIPHY_FLAG_4ADDR_STATION | 597 WIPHY_FLAG_REPORTS_OBSS | 598 WIPHY_FLAG_OFFCHAN_TX | 599 WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL; 600 601 wiphy->features = NL80211_FEATURE_SK_TX_STATUS; 602 603 if (!ops->set_key) 604 wiphy->flags |= WIPHY_FLAG_IBSS_RSN; 605 606 wiphy->bss_priv_size = sizeof(struct ieee80211_bss); 607 608 local = wiphy_priv(wiphy); 609 610 local->hw.wiphy = wiphy; 611 612 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 613 614 BUG_ON(!ops->tx && !ops->tx_frags); 615 BUG_ON(!ops->start); 616 BUG_ON(!ops->stop); 617 BUG_ON(!ops->config); 618 BUG_ON(!ops->add_interface); 619 BUG_ON(!ops->remove_interface); 620 BUG_ON(!ops->configure_filter); 621 local->ops = ops; 622 623 /* set up some defaults */ 624 local->hw.queues = 1; 625 local->hw.max_rates = 1; 626 local->hw.max_report_rates = 0; 627 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 628 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 629 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 630 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 631 local->user_power_level = -1; 632 local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES; 633 local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN; 634 635 INIT_LIST_HEAD(&local->interfaces); 636 637 __hw_addr_init(&local->mc_list); 638 639 mutex_init(&local->iflist_mtx); 640 mutex_init(&local->mtx); 641 642 mutex_init(&local->key_mtx); 643 spin_lock_init(&local->filter_lock); 644 spin_lock_init(&local->queue_stop_reason_lock); 645 646 /* 647 * The rx_skb_queue is only accessed from tasklets, 648 * but other SKB queues are used from within IRQ 649 * context. Therefore, this one needs a different 650 * locking class so our direct, non-irq-safe use of 651 * the queue's lock doesn't throw lockdep warnings. 652 */ 653 skb_queue_head_init_class(&local->rx_skb_queue, 654 &ieee80211_rx_skb_queue_class); 655 656 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 657 658 ieee80211_work_init(local); 659 660 INIT_WORK(&local->restart_work, ieee80211_restart_work); 661 662 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter); 663 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work); 664 local->smps_mode = IEEE80211_SMPS_OFF; 665 666 INIT_WORK(&local->dynamic_ps_enable_work, 667 ieee80211_dynamic_ps_enable_work); 668 INIT_WORK(&local->dynamic_ps_disable_work, 669 ieee80211_dynamic_ps_disable_work); 670 setup_timer(&local->dynamic_ps_timer, 671 ieee80211_dynamic_ps_timer, (unsigned long) local); 672 673 INIT_WORK(&local->sched_scan_stopped_work, 674 ieee80211_sched_scan_stopped_work); 675 676 spin_lock_init(&local->ack_status_lock); 677 idr_init(&local->ack_status_frames); 678 /* preallocate at least one entry */ 679 idr_pre_get(&local->ack_status_frames, GFP_KERNEL); 680 681 sta_info_init(local); 682 683 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 684 skb_queue_head_init(&local->pending[i]); 685 atomic_set(&local->agg_queue_stop[i], 0); 686 } 687 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 688 (unsigned long)local); 689 690 tasklet_init(&local->tasklet, 691 ieee80211_tasklet_handler, 692 (unsigned long) local); 693 694 skb_queue_head_init(&local->skb_queue); 695 skb_queue_head_init(&local->skb_queue_unreliable); 696 697 /* init dummy netdev for use w/ NAPI */ 698 init_dummy_netdev(&local->napi_dev); 699 700 ieee80211_led_names(local); 701 702 ieee80211_hw_roc_setup(local); 703 704 return local_to_hw(local); 705} 706EXPORT_SYMBOL(ieee80211_alloc_hw); 707 708int ieee80211_register_hw(struct ieee80211_hw *hw) 709{ 710 struct ieee80211_local *local = hw_to_local(hw); 711 int result, i; 712 enum ieee80211_band band; 713 int channels, max_bitrates; 714 bool supp_ht; 715 static const u32 cipher_suites[] = { 716 /* keep WEP first, it may be removed below */ 717 WLAN_CIPHER_SUITE_WEP40, 718 WLAN_CIPHER_SUITE_WEP104, 719 WLAN_CIPHER_SUITE_TKIP, 720 WLAN_CIPHER_SUITE_CCMP, 721 722 /* keep last -- depends on hw flags! */ 723 WLAN_CIPHER_SUITE_AES_CMAC 724 }; 725 726 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) 727#ifdef CONFIG_PM 728 && (!local->ops->suspend || !local->ops->resume) 729#endif 730 ) 731 return -EINVAL; 732 733 if (hw->max_report_rates == 0) 734 hw->max_report_rates = hw->max_rates; 735 736 /* 737 * generic code guarantees at least one band, 738 * set this very early because much code assumes 739 * that hw.conf.channel is assigned 740 */ 741 channels = 0; 742 max_bitrates = 0; 743 supp_ht = false; 744 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 745 struct ieee80211_supported_band *sband; 746 747 sband = local->hw.wiphy->bands[band]; 748 if (!sband) 749 continue; 750 if (!local->oper_channel) { 751 /* init channel we're on */ 752 local->hw.conf.channel = 753 local->oper_channel = &sband->channels[0]; 754 local->hw.conf.channel_type = NL80211_CHAN_NO_HT; 755 } 756 channels += sband->n_channels; 757 758 if (max_bitrates < sband->n_bitrates) 759 max_bitrates = sband->n_bitrates; 760 supp_ht = supp_ht || sband->ht_cap.ht_supported; 761 } 762 763 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) + 764 sizeof(void *) * channels, GFP_KERNEL); 765 if (!local->int_scan_req) 766 return -ENOMEM; 767 768 /* if low-level driver supports AP, we also support VLAN */ 769 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) { 770 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 771 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN); 772 } 773 774 /* mac80211 always supports monitor */ 775 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 776 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR); 777 778 /* 779 * mac80211 doesn't support more than 1 channel, and also not more 780 * than one IBSS interface 781 */ 782 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) { 783 const struct ieee80211_iface_combination *c; 784 int j; 785 786 c = &hw->wiphy->iface_combinations[i]; 787 788 if (c->num_different_channels > 1) 789 return -EINVAL; 790 791 for (j = 0; j < c->n_limits; j++) 792 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) && 793 c->limits[j].max > 1) 794 return -EINVAL; 795 } 796 797#ifndef CONFIG_MAC80211_MESH 798 /* mesh depends on Kconfig, but drivers should set it if they want */ 799 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT); 800#endif 801 802 /* if the underlying driver supports mesh, mac80211 will (at least) 803 * provide routing of mesh authentication frames to userspace */ 804 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT)) 805 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH; 806 807 /* mac80211 supports control port protocol changing */ 808 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL; 809 810 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 811 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 812 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 813 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 814 815 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) 816 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK), 817 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"); 818 819 /* 820 * Calculate scan IE length -- we need this to alloc 821 * memory and to subtract from the driver limit. It 822 * includes the DS Params, (extended) supported rates, and HT 823 * information -- SSID is the driver's responsibility. 824 */ 825 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ + 826 3 /* DS Params */; 827 if (supp_ht) 828 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 829 830 if (!local->ops->hw_scan) { 831 /* For hw_scan, driver needs to set these up. */ 832 local->hw.wiphy->max_scan_ssids = 4; 833 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 834 } 835 836 /* 837 * If the driver supports any scan IEs, then assume the 838 * limit includes the IEs mac80211 will add, otherwise 839 * leave it at zero and let the driver sort it out; we 840 * still pass our IEs to the driver but userspace will 841 * not be allowed to in that case. 842 */ 843 if (local->hw.wiphy->max_scan_ie_len) 844 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 845 846 /* Set up cipher suites unless driver already did */ 847 if (!local->hw.wiphy->cipher_suites) { 848 local->hw.wiphy->cipher_suites = cipher_suites; 849 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 850 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) 851 local->hw.wiphy->n_cipher_suites--; 852 } 853 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) { 854 if (local->hw.wiphy->cipher_suites == cipher_suites) { 855 local->hw.wiphy->cipher_suites += 2; 856 local->hw.wiphy->n_cipher_suites -= 2; 857 } else { 858 u32 *suites; 859 int r, w = 0; 860 861 /* Filter out WEP */ 862 863 suites = kmemdup( 864 local->hw.wiphy->cipher_suites, 865 sizeof(u32) * local->hw.wiphy->n_cipher_suites, 866 GFP_KERNEL); 867 if (!suites) 868 return -ENOMEM; 869 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) { 870 u32 suite = local->hw.wiphy->cipher_suites[r]; 871 if (suite == WLAN_CIPHER_SUITE_WEP40 || 872 suite == WLAN_CIPHER_SUITE_WEP104) 873 continue; 874 suites[w++] = suite; 875 } 876 local->hw.wiphy->cipher_suites = suites; 877 local->hw.wiphy->n_cipher_suites = w; 878 local->wiphy_ciphers_allocated = true; 879 } 880 } 881 882 if (!local->ops->remain_on_channel) 883 local->hw.wiphy->max_remain_on_channel_duration = 5000; 884 885 if (local->ops->sched_scan_start) 886 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN; 887 888 /* mac80211 based drivers don't support internal TDLS setup */ 889 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) 890 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP; 891 892 result = wiphy_register(local->hw.wiphy); 893 if (result < 0) 894 goto fail_wiphy_register; 895 896 /* 897 * We use the number of queues for feature tests (QoS, HT) internally 898 * so restrict them appropriately. 899 */ 900 if (hw->queues > IEEE80211_MAX_QUEUES) 901 hw->queues = IEEE80211_MAX_QUEUES; 902 903 local->workqueue = 904 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0); 905 if (!local->workqueue) { 906 result = -ENOMEM; 907 goto fail_workqueue; 908 } 909 910 /* 911 * The hardware needs headroom for sending the frame, 912 * and we need some headroom for passing the frame to monitor 913 * interfaces, but never both at the same time. 914 */ 915 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 916 IEEE80211_TX_STATUS_HEADROOM); 917 918 debugfs_hw_add(local); 919 920 /* 921 * if the driver doesn't specify a max listen interval we 922 * use 5 which should be a safe default 923 */ 924 if (local->hw.max_listen_interval == 0) 925 local->hw.max_listen_interval = 5; 926 927 local->hw.conf.listen_interval = local->hw.max_listen_interval; 928 929 local->dynamic_ps_forced_timeout = -1; 930 931 result = ieee80211_wep_init(local); 932 if (result < 0) 933 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n", 934 result); 935 936 rtnl_lock(); 937 938 result = ieee80211_init_rate_ctrl_alg(local, 939 hw->rate_control_algorithm); 940 if (result < 0) { 941 wiphy_debug(local->hw.wiphy, 942 "Failed to initialize rate control algorithm\n"); 943 goto fail_rate; 944 } 945 946 /* add one default STA interface if supported */ 947 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 948 result = ieee80211_if_add(local, "wlan%d", NULL, 949 NL80211_IFTYPE_STATION, NULL); 950 if (result) 951 wiphy_warn(local->hw.wiphy, 952 "Failed to add default virtual iface\n"); 953 } 954 955 rtnl_unlock(); 956 957 ieee80211_led_init(local); 958 959 local->network_latency_notifier.notifier_call = 960 ieee80211_max_network_latency; 961 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 962 &local->network_latency_notifier); 963 if (result) { 964 rtnl_lock(); 965 goto fail_pm_qos; 966 } 967 968#ifdef CONFIG_INET 969 local->ifa_notifier.notifier_call = ieee80211_ifa_changed; 970 result = register_inetaddr_notifier(&local->ifa_notifier); 971 if (result) 972 goto fail_ifa; 973#endif 974 975 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll, 976 local->hw.napi_weight); 977 978 return 0; 979 980#ifdef CONFIG_INET 981 fail_ifa: 982 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 983 &local->network_latency_notifier); 984 rtnl_lock(); 985#endif 986 fail_pm_qos: 987 ieee80211_led_exit(local); 988 ieee80211_remove_interfaces(local); 989 fail_rate: 990 rtnl_unlock(); 991 ieee80211_wep_free(local); 992 sta_info_stop(local); 993 destroy_workqueue(local->workqueue); 994 fail_workqueue: 995 wiphy_unregister(local->hw.wiphy); 996 fail_wiphy_register: 997 if (local->wiphy_ciphers_allocated) 998 kfree(local->hw.wiphy->cipher_suites); 999 kfree(local->int_scan_req); 1000 return result; 1001} 1002EXPORT_SYMBOL(ieee80211_register_hw); 1003 1004void ieee80211_unregister_hw(struct ieee80211_hw *hw) 1005{ 1006 struct ieee80211_local *local = hw_to_local(hw); 1007 1008 tasklet_kill(&local->tx_pending_tasklet); 1009 tasklet_kill(&local->tasklet); 1010 1011 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 1012 &local->network_latency_notifier); 1013#ifdef CONFIG_INET 1014 unregister_inetaddr_notifier(&local->ifa_notifier); 1015#endif 1016 1017 rtnl_lock(); 1018 1019 /* 1020 * At this point, interface list manipulations are fine 1021 * because the driver cannot be handing us frames any 1022 * more and the tasklet is killed. 1023 */ 1024 ieee80211_remove_interfaces(local); 1025 1026 rtnl_unlock(); 1027 1028 /* 1029 * Now all work items will be gone, but the 1030 * timer might still be armed, so delete it 1031 */ 1032 del_timer_sync(&local->work_timer); 1033 1034 cancel_work_sync(&local->restart_work); 1035 cancel_work_sync(&local->reconfig_filter); 1036 1037 ieee80211_clear_tx_pending(local); 1038 rate_control_deinitialize(local); 1039 1040 if (skb_queue_len(&local->skb_queue) || 1041 skb_queue_len(&local->skb_queue_unreliable)) 1042 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n"); 1043 skb_queue_purge(&local->skb_queue); 1044 skb_queue_purge(&local->skb_queue_unreliable); 1045 skb_queue_purge(&local->rx_skb_queue); 1046 1047 destroy_workqueue(local->workqueue); 1048 wiphy_unregister(local->hw.wiphy); 1049 sta_info_stop(local); 1050 ieee80211_wep_free(local); 1051 ieee80211_led_exit(local); 1052 kfree(local->int_scan_req); 1053} 1054EXPORT_SYMBOL(ieee80211_unregister_hw); 1055 1056static int ieee80211_free_ack_frame(int id, void *p, void *data) 1057{ 1058 WARN_ONCE(1, "Have pending ack frames!\n"); 1059 kfree_skb(p); 1060 return 0; 1061} 1062 1063void ieee80211_free_hw(struct ieee80211_hw *hw) 1064{ 1065 struct ieee80211_local *local = hw_to_local(hw); 1066 1067 mutex_destroy(&local->iflist_mtx); 1068 mutex_destroy(&local->mtx); 1069 1070 if (local->wiphy_ciphers_allocated) 1071 kfree(local->hw.wiphy->cipher_suites); 1072 1073 idr_for_each(&local->ack_status_frames, 1074 ieee80211_free_ack_frame, NULL); 1075 idr_destroy(&local->ack_status_frames); 1076 1077 wiphy_free(local->hw.wiphy); 1078} 1079EXPORT_SYMBOL(ieee80211_free_hw); 1080 1081static int __init ieee80211_init(void) 1082{ 1083 struct sk_buff *skb; 1084 int ret; 1085 1086 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1087 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1088 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1089 1090 ret = rc80211_minstrel_init(); 1091 if (ret) 1092 return ret; 1093 1094 ret = rc80211_minstrel_ht_init(); 1095 if (ret) 1096 goto err_minstrel; 1097 1098 ret = rc80211_pid_init(); 1099 if (ret) 1100 goto err_pid; 1101 1102 ret = ieee80211_iface_init(); 1103 if (ret) 1104 goto err_netdev; 1105 1106 return 0; 1107 err_netdev: 1108 rc80211_pid_exit(); 1109 err_pid: 1110 rc80211_minstrel_ht_exit(); 1111 err_minstrel: 1112 rc80211_minstrel_exit(); 1113 1114 return ret; 1115} 1116 1117static void __exit ieee80211_exit(void) 1118{ 1119 rc80211_pid_exit(); 1120 rc80211_minstrel_ht_exit(); 1121 rc80211_minstrel_exit(); 1122 1123 if (mesh_allocated) 1124 ieee80211s_stop(); 1125 1126 ieee80211_iface_exit(); 1127 1128 rcu_barrier(); 1129} 1130 1131 1132subsys_initcall(ieee80211_init); 1133module_exit(ieee80211_exit); 1134 1135MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1136MODULE_LICENSE("GPL"); 1137