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