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 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 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 default: 344 WARN(1, "mac80211: Packet is of unknown type %d\n", 345 skb->pkt_type); 346 dev_kfree_skb(skb); 347 break; 348 } 349 } 350 } 351 352 static void ieee80211_restart_work(struct work_struct *work) 353 { 354 struct ieee80211_local *local = 355 container_of(work, struct ieee80211_local, restart_work); 356 357 /* wait for scan work complete */ 358 flush_workqueue(local->workqueue); 359 360 mutex_lock(&local->mtx); 361 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) || 362 local->sched_scanning, 363 "%s called with hardware scan in progress\n", __func__); 364 mutex_unlock(&local->mtx); 365 366 rtnl_lock(); 367 ieee80211_scan_cancel(local); 368 ieee80211_reconfig(local); 369 rtnl_unlock(); 370 } 371 372 void ieee80211_restart_hw(struct ieee80211_hw *hw) 373 { 374 struct ieee80211_local *local = hw_to_local(hw); 375 376 trace_api_restart_hw(local); 377 378 wiphy_info(hw->wiphy, 379 "Hardware restart was requested\n"); 380 381 /* use this reason, ieee80211_reconfig will unblock it */ 382 ieee80211_stop_queues_by_reason(hw, 383 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 384 385 schedule_work(&local->restart_work); 386 } 387 EXPORT_SYMBOL(ieee80211_restart_hw); 388 389 static void ieee80211_recalc_smps_work(struct work_struct *work) 390 { 391 struct ieee80211_local *local = 392 container_of(work, struct ieee80211_local, recalc_smps); 393 394 mutex_lock(&local->iflist_mtx); 395 ieee80211_recalc_smps(local); 396 mutex_unlock(&local->iflist_mtx); 397 } 398 399 #ifdef CONFIG_INET 400 static int ieee80211_ifa_changed(struct notifier_block *nb, 401 unsigned long data, void *arg) 402 { 403 struct in_ifaddr *ifa = arg; 404 struct ieee80211_local *local = 405 container_of(nb, struct ieee80211_local, 406 ifa_notifier); 407 struct net_device *ndev = ifa->ifa_dev->dev; 408 struct wireless_dev *wdev = ndev->ieee80211_ptr; 409 struct in_device *idev; 410 struct ieee80211_sub_if_data *sdata; 411 struct ieee80211_bss_conf *bss_conf; 412 struct ieee80211_if_managed *ifmgd; 413 int c = 0; 414 415 /* Make sure it's our interface that got changed */ 416 if (!wdev) 417 return NOTIFY_DONE; 418 419 if (wdev->wiphy != local->hw.wiphy) 420 return NOTIFY_DONE; 421 422 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 423 bss_conf = &sdata->vif.bss_conf; 424 425 if (!ieee80211_sdata_running(sdata)) 426 return NOTIFY_DONE; 427 428 /* ARP filtering is only supported in managed mode */ 429 if (sdata->vif.type != NL80211_IFTYPE_STATION) 430 return NOTIFY_DONE; 431 432 idev = __in_dev_get_rtnl(sdata->dev); 433 if (!idev) 434 return NOTIFY_DONE; 435 436 ifmgd = &sdata->u.mgd; 437 mutex_lock(&ifmgd->mtx); 438 439 /* Copy the addresses to the bss_conf list */ 440 ifa = idev->ifa_list; 441 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) { 442 bss_conf->arp_addr_list[c] = ifa->ifa_address; 443 ifa = ifa->ifa_next; 444 c++; 445 } 446 447 /* If not all addresses fit the list, disable filtering */ 448 if (ifa) { 449 sdata->arp_filter_state = false; 450 c = 0; 451 } else { 452 sdata->arp_filter_state = true; 453 } 454 bss_conf->arp_addr_cnt = c; 455 456 /* Configure driver only if associated */ 457 if (ifmgd->associated) { 458 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 459 ieee80211_bss_info_change_notify(sdata, 460 BSS_CHANGED_ARP_FILTER); 461 } 462 463 mutex_unlock(&ifmgd->mtx); 464 465 return NOTIFY_DONE; 466 } 467 #endif 468 469 static int ieee80211_napi_poll(struct napi_struct *napi, int budget) 470 { 471 struct ieee80211_local *local = 472 container_of(napi, struct ieee80211_local, napi); 473 474 return local->ops->napi_poll(&local->hw, budget); 475 } 476 477 void ieee80211_napi_schedule(struct ieee80211_hw *hw) 478 { 479 struct ieee80211_local *local = hw_to_local(hw); 480 481 napi_schedule(&local->napi); 482 } 483 EXPORT_SYMBOL(ieee80211_napi_schedule); 484 485 void ieee80211_napi_complete(struct ieee80211_hw *hw) 486 { 487 struct ieee80211_local *local = hw_to_local(hw); 488 489 napi_complete(&local->napi); 490 } 491 EXPORT_SYMBOL(ieee80211_napi_complete); 492 493 /* There isn't a lot of sense in it, but you can transmit anything you like */ 494 static const struct ieee80211_txrx_stypes 495 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = { 496 [NL80211_IFTYPE_ADHOC] = { 497 .tx = 0xffff, 498 .rx = BIT(IEEE80211_STYPE_ACTION >> 4), 499 }, 500 [NL80211_IFTYPE_STATION] = { 501 .tx = 0xffff, 502 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 503 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 504 }, 505 [NL80211_IFTYPE_AP] = { 506 .tx = 0xffff, 507 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 508 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 509 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 510 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 511 BIT(IEEE80211_STYPE_AUTH >> 4) | 512 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 513 BIT(IEEE80211_STYPE_ACTION >> 4), 514 }, 515 [NL80211_IFTYPE_AP_VLAN] = { 516 /* copy AP */ 517 .tx = 0xffff, 518 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 519 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 520 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 521 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 522 BIT(IEEE80211_STYPE_AUTH >> 4) | 523 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 524 BIT(IEEE80211_STYPE_ACTION >> 4), 525 }, 526 [NL80211_IFTYPE_P2P_CLIENT] = { 527 .tx = 0xffff, 528 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 529 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 530 }, 531 [NL80211_IFTYPE_P2P_GO] = { 532 .tx = 0xffff, 533 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 534 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 535 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 536 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 537 BIT(IEEE80211_STYPE_AUTH >> 4) | 538 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 539 BIT(IEEE80211_STYPE_ACTION >> 4), 540 }, 541 [NL80211_IFTYPE_MESH_POINT] = { 542 .tx = 0xffff, 543 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 544 BIT(IEEE80211_STYPE_AUTH >> 4) | 545 BIT(IEEE80211_STYPE_DEAUTH >> 4), 546 }, 547 }; 548 549 struct 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; 585 586 if (!ops->set_key) 587 wiphy->flags |= WIPHY_FLAG_IBSS_RSN; 588 589 wiphy->bss_priv_size = sizeof(struct ieee80211_bss); 590 591 local = wiphy_priv(wiphy); 592 593 local->hw.wiphy = wiphy; 594 595 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 596 597 BUG_ON(!ops->tx); 598 BUG_ON(!ops->start); 599 BUG_ON(!ops->stop); 600 BUG_ON(!ops->config); 601 BUG_ON(!ops->add_interface); 602 BUG_ON(!ops->remove_interface); 603 BUG_ON(!ops->configure_filter); 604 local->ops = ops; 605 606 /* set up some defaults */ 607 local->hw.queues = 1; 608 local->hw.max_rates = 1; 609 local->hw.max_report_rates = 0; 610 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 611 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 612 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 613 local->user_power_level = -1; 614 local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES; 615 local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN; 616 617 INIT_LIST_HEAD(&local->interfaces); 618 619 __hw_addr_init(&local->mc_list); 620 621 mutex_init(&local->iflist_mtx); 622 mutex_init(&local->mtx); 623 624 mutex_init(&local->key_mtx); 625 spin_lock_init(&local->filter_lock); 626 spin_lock_init(&local->queue_stop_reason_lock); 627 628 /* 629 * The rx_skb_queue is only accessed from tasklets, 630 * but other SKB queues are used from within IRQ 631 * context. Therefore, this one needs a different 632 * locking class so our direct, non-irq-safe use of 633 * the queue's lock doesn't throw lockdep warnings. 634 */ 635 skb_queue_head_init_class(&local->rx_skb_queue, 636 &ieee80211_rx_skb_queue_class); 637 638 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 639 640 ieee80211_work_init(local); 641 642 INIT_WORK(&local->restart_work, ieee80211_restart_work); 643 644 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter); 645 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work); 646 local->smps_mode = IEEE80211_SMPS_OFF; 647 648 INIT_WORK(&local->dynamic_ps_enable_work, 649 ieee80211_dynamic_ps_enable_work); 650 INIT_WORK(&local->dynamic_ps_disable_work, 651 ieee80211_dynamic_ps_disable_work); 652 setup_timer(&local->dynamic_ps_timer, 653 ieee80211_dynamic_ps_timer, (unsigned long) local); 654 655 INIT_WORK(&local->sched_scan_stopped_work, 656 ieee80211_sched_scan_stopped_work); 657 658 sta_info_init(local); 659 660 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 661 skb_queue_head_init(&local->pending[i]); 662 atomic_set(&local->agg_queue_stop[i], 0); 663 } 664 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 665 (unsigned long)local); 666 667 tasklet_init(&local->tasklet, 668 ieee80211_tasklet_handler, 669 (unsigned long) local); 670 671 skb_queue_head_init(&local->skb_queue); 672 skb_queue_head_init(&local->skb_queue_unreliable); 673 674 /* init dummy netdev for use w/ NAPI */ 675 init_dummy_netdev(&local->napi_dev); 676 677 ieee80211_led_names(local); 678 679 ieee80211_hw_roc_setup(local); 680 681 return local_to_hw(local); 682 } 683 EXPORT_SYMBOL(ieee80211_alloc_hw); 684 685 int ieee80211_register_hw(struct ieee80211_hw *hw) 686 { 687 struct ieee80211_local *local = hw_to_local(hw); 688 int result, i; 689 enum ieee80211_band band; 690 int channels, max_bitrates; 691 bool supp_ht; 692 static const u32 cipher_suites[] = { 693 /* keep WEP first, it may be removed below */ 694 WLAN_CIPHER_SUITE_WEP40, 695 WLAN_CIPHER_SUITE_WEP104, 696 WLAN_CIPHER_SUITE_TKIP, 697 WLAN_CIPHER_SUITE_CCMP, 698 699 /* keep last -- depends on hw flags! */ 700 WLAN_CIPHER_SUITE_AES_CMAC 701 }; 702 703 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) 704 #ifdef CONFIG_PM 705 && (!local->ops->suspend || !local->ops->resume) 706 #endif 707 ) 708 return -EINVAL; 709 710 if (hw->max_report_rates == 0) 711 hw->max_report_rates = hw->max_rates; 712 713 /* 714 * generic code guarantees at least one band, 715 * set this very early because much code assumes 716 * that hw.conf.channel is assigned 717 */ 718 channels = 0; 719 max_bitrates = 0; 720 supp_ht = false; 721 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 722 struct ieee80211_supported_band *sband; 723 724 sband = local->hw.wiphy->bands[band]; 725 if (!sband) 726 continue; 727 if (!local->oper_channel) { 728 /* init channel we're on */ 729 local->hw.conf.channel = 730 local->oper_channel = &sband->channels[0]; 731 local->hw.conf.channel_type = NL80211_CHAN_NO_HT; 732 } 733 channels += sband->n_channels; 734 735 if (max_bitrates < sband->n_bitrates) 736 max_bitrates = sband->n_bitrates; 737 supp_ht = supp_ht || sband->ht_cap.ht_supported; 738 } 739 740 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) + 741 sizeof(void *) * channels, GFP_KERNEL); 742 if (!local->int_scan_req) 743 return -ENOMEM; 744 745 /* if low-level driver supports AP, we also support VLAN */ 746 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) { 747 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 748 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN); 749 } 750 751 /* mac80211 always supports monitor */ 752 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 753 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR); 754 755 /* mac80211 doesn't support more than 1 channel */ 756 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) 757 if (hw->wiphy->iface_combinations[i].num_different_channels > 1) 758 return -EINVAL; 759 760 #ifndef CONFIG_MAC80211_MESH 761 /* mesh depends on Kconfig, but drivers should set it if they want */ 762 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT); 763 #endif 764 765 /* if the underlying driver supports mesh, mac80211 will (at least) 766 * provide routing of mesh authentication frames to userspace */ 767 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT)) 768 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH; 769 770 /* mac80211 supports control port protocol changing */ 771 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL; 772 773 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 774 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 775 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 776 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 777 778 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) 779 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK), 780 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"); 781 782 /* 783 * Calculate scan IE length -- we need this to alloc 784 * memory and to subtract from the driver limit. It 785 * includes the DS Params, (extended) supported rates, and HT 786 * information -- SSID is the driver's responsibility. 787 */ 788 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ + 789 3 /* DS Params */; 790 if (supp_ht) 791 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 792 793 if (!local->ops->hw_scan) { 794 /* For hw_scan, driver needs to set these up. */ 795 local->hw.wiphy->max_scan_ssids = 4; 796 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 797 } 798 799 /* 800 * If the driver supports any scan IEs, then assume the 801 * limit includes the IEs mac80211 will add, otherwise 802 * leave it at zero and let the driver sort it out; we 803 * still pass our IEs to the driver but userspace will 804 * not be allowed to in that case. 805 */ 806 if (local->hw.wiphy->max_scan_ie_len) 807 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 808 809 /* Set up cipher suites unless driver already did */ 810 if (!local->hw.wiphy->cipher_suites) { 811 local->hw.wiphy->cipher_suites = cipher_suites; 812 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 813 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) 814 local->hw.wiphy->n_cipher_suites--; 815 } 816 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) { 817 if (local->hw.wiphy->cipher_suites == cipher_suites) { 818 local->hw.wiphy->cipher_suites += 2; 819 local->hw.wiphy->n_cipher_suites -= 2; 820 } else { 821 u32 *suites; 822 int r, w = 0; 823 824 /* Filter out WEP */ 825 826 suites = kmemdup( 827 local->hw.wiphy->cipher_suites, 828 sizeof(u32) * local->hw.wiphy->n_cipher_suites, 829 GFP_KERNEL); 830 if (!suites) 831 return -ENOMEM; 832 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) { 833 u32 suite = local->hw.wiphy->cipher_suites[r]; 834 if (suite == WLAN_CIPHER_SUITE_WEP40 || 835 suite == WLAN_CIPHER_SUITE_WEP104) 836 continue; 837 suites[w++] = suite; 838 } 839 local->hw.wiphy->cipher_suites = suites; 840 local->hw.wiphy->n_cipher_suites = w; 841 local->wiphy_ciphers_allocated = true; 842 } 843 } 844 845 if (!local->ops->remain_on_channel) 846 local->hw.wiphy->max_remain_on_channel_duration = 5000; 847 848 if (local->ops->sched_scan_start) 849 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN; 850 851 result = wiphy_register(local->hw.wiphy); 852 if (result < 0) 853 goto fail_wiphy_register; 854 855 /* 856 * We use the number of queues for feature tests (QoS, HT) internally 857 * so restrict them appropriately. 858 */ 859 if (hw->queues > IEEE80211_MAX_QUEUES) 860 hw->queues = IEEE80211_MAX_QUEUES; 861 862 local->workqueue = 863 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0); 864 if (!local->workqueue) { 865 result = -ENOMEM; 866 goto fail_workqueue; 867 } 868 869 /* 870 * The hardware needs headroom for sending the frame, 871 * and we need some headroom for passing the frame to monitor 872 * interfaces, but never both at the same time. 873 */ 874 #ifndef __CHECKER__ 875 BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM != 876 sizeof(struct ieee80211_tx_status_rtap_hdr)); 877 #endif 878 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 879 sizeof(struct ieee80211_tx_status_rtap_hdr)); 880 881 debugfs_hw_add(local); 882 883 /* 884 * if the driver doesn't specify a max listen interval we 885 * use 5 which should be a safe default 886 */ 887 if (local->hw.max_listen_interval == 0) 888 local->hw.max_listen_interval = 5; 889 890 local->hw.conf.listen_interval = local->hw.max_listen_interval; 891 892 local->dynamic_ps_forced_timeout = -1; 893 894 result = ieee80211_wep_init(local); 895 if (result < 0) 896 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n", 897 result); 898 899 rtnl_lock(); 900 901 result = ieee80211_init_rate_ctrl_alg(local, 902 hw->rate_control_algorithm); 903 if (result < 0) { 904 wiphy_debug(local->hw.wiphy, 905 "Failed to initialize rate control algorithm\n"); 906 goto fail_rate; 907 } 908 909 /* add one default STA interface if supported */ 910 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 911 result = ieee80211_if_add(local, "wlan%d", NULL, 912 NL80211_IFTYPE_STATION, NULL); 913 if (result) 914 wiphy_warn(local->hw.wiphy, 915 "Failed to add default virtual iface\n"); 916 } 917 918 rtnl_unlock(); 919 920 ieee80211_led_init(local); 921 922 local->network_latency_notifier.notifier_call = 923 ieee80211_max_network_latency; 924 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 925 &local->network_latency_notifier); 926 if (result) { 927 rtnl_lock(); 928 goto fail_pm_qos; 929 } 930 931 #ifdef CONFIG_INET 932 local->ifa_notifier.notifier_call = ieee80211_ifa_changed; 933 result = register_inetaddr_notifier(&local->ifa_notifier); 934 if (result) 935 goto fail_ifa; 936 #endif 937 938 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll, 939 local->hw.napi_weight); 940 941 return 0; 942 943 #ifdef CONFIG_INET 944 fail_ifa: 945 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 946 &local->network_latency_notifier); 947 rtnl_lock(); 948 #endif 949 fail_pm_qos: 950 ieee80211_led_exit(local); 951 ieee80211_remove_interfaces(local); 952 fail_rate: 953 rtnl_unlock(); 954 ieee80211_wep_free(local); 955 sta_info_stop(local); 956 destroy_workqueue(local->workqueue); 957 fail_workqueue: 958 wiphy_unregister(local->hw.wiphy); 959 fail_wiphy_register: 960 if (local->wiphy_ciphers_allocated) 961 kfree(local->hw.wiphy->cipher_suites); 962 kfree(local->int_scan_req); 963 return result; 964 } 965 EXPORT_SYMBOL(ieee80211_register_hw); 966 967 void ieee80211_unregister_hw(struct ieee80211_hw *hw) 968 { 969 struct ieee80211_local *local = hw_to_local(hw); 970 971 tasklet_kill(&local->tx_pending_tasklet); 972 tasklet_kill(&local->tasklet); 973 974 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 975 &local->network_latency_notifier); 976 #ifdef CONFIG_INET 977 unregister_inetaddr_notifier(&local->ifa_notifier); 978 #endif 979 980 rtnl_lock(); 981 982 /* 983 * At this point, interface list manipulations are fine 984 * because the driver cannot be handing us frames any 985 * more and the tasklet is killed. 986 */ 987 ieee80211_remove_interfaces(local); 988 989 rtnl_unlock(); 990 991 /* 992 * Now all work items will be gone, but the 993 * timer might still be armed, so delete it 994 */ 995 del_timer_sync(&local->work_timer); 996 997 cancel_work_sync(&local->restart_work); 998 cancel_work_sync(&local->reconfig_filter); 999 1000 ieee80211_clear_tx_pending(local); 1001 sta_info_stop(local); 1002 rate_control_deinitialize(local); 1003 1004 if (skb_queue_len(&local->skb_queue) || 1005 skb_queue_len(&local->skb_queue_unreliable)) 1006 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n"); 1007 skb_queue_purge(&local->skb_queue); 1008 skb_queue_purge(&local->skb_queue_unreliable); 1009 skb_queue_purge(&local->rx_skb_queue); 1010 1011 destroy_workqueue(local->workqueue); 1012 wiphy_unregister(local->hw.wiphy); 1013 ieee80211_wep_free(local); 1014 ieee80211_led_exit(local); 1015 kfree(local->int_scan_req); 1016 } 1017 EXPORT_SYMBOL(ieee80211_unregister_hw); 1018 1019 void ieee80211_free_hw(struct ieee80211_hw *hw) 1020 { 1021 struct ieee80211_local *local = hw_to_local(hw); 1022 1023 mutex_destroy(&local->iflist_mtx); 1024 mutex_destroy(&local->mtx); 1025 1026 if (local->wiphy_ciphers_allocated) 1027 kfree(local->hw.wiphy->cipher_suites); 1028 1029 wiphy_free(local->hw.wiphy); 1030 } 1031 EXPORT_SYMBOL(ieee80211_free_hw); 1032 1033 static int __init ieee80211_init(void) 1034 { 1035 struct sk_buff *skb; 1036 int ret; 1037 1038 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1039 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1040 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1041 1042 ret = rc80211_minstrel_init(); 1043 if (ret) 1044 return ret; 1045 1046 ret = rc80211_minstrel_ht_init(); 1047 if (ret) 1048 goto err_minstrel; 1049 1050 ret = rc80211_pid_init(); 1051 if (ret) 1052 goto err_pid; 1053 1054 ret = ieee80211_iface_init(); 1055 if (ret) 1056 goto err_netdev; 1057 1058 return 0; 1059 err_netdev: 1060 rc80211_pid_exit(); 1061 err_pid: 1062 rc80211_minstrel_ht_exit(); 1063 err_minstrel: 1064 rc80211_minstrel_exit(); 1065 1066 return ret; 1067 } 1068 1069 static void __exit ieee80211_exit(void) 1070 { 1071 rc80211_pid_exit(); 1072 rc80211_minstrel_ht_exit(); 1073 rc80211_minstrel_exit(); 1074 1075 if (mesh_allocated) 1076 ieee80211s_stop(); 1077 1078 ieee80211_iface_exit(); 1079 } 1080 1081 1082 subsys_initcall(ieee80211_init); 1083 module_exit(ieee80211_exit); 1084 1085 MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1086 MODULE_LICENSE("GPL"); 1087