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 37 static bool ieee80211_disable_40mhz_24ghz; 38 module_param(ieee80211_disable_40mhz_24ghz, bool, 0644); 39 MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz, 40 "Disable 40MHz support in the 2.4GHz band"); 41 42 static struct lock_class_key ieee80211_rx_skb_queue_class; 43 44 void ieee80211_configure_filter(struct ieee80211_local *local) 45 { 46 u64 mc; 47 unsigned int changed_flags; 48 unsigned int new_flags = 0; 49 50 if (atomic_read(&local->iff_promiscs)) 51 new_flags |= FIF_PROMISC_IN_BSS; 52 53 if (atomic_read(&local->iff_allmultis)) 54 new_flags |= FIF_ALLMULTI; 55 56 if (local->monitors || local->scanning) 57 new_flags |= FIF_BCN_PRBRESP_PROMISC; 58 59 if (local->fif_probe_req || local->probe_req_reg) 60 new_flags |= FIF_PROBE_REQ; 61 62 if (local->fif_fcsfail) 63 new_flags |= FIF_FCSFAIL; 64 65 if (local->fif_plcpfail) 66 new_flags |= FIF_PLCPFAIL; 67 68 if (local->fif_control) 69 new_flags |= FIF_CONTROL; 70 71 if (local->fif_other_bss) 72 new_flags |= FIF_OTHER_BSS; 73 74 if (local->fif_pspoll) 75 new_flags |= FIF_PSPOLL; 76 77 spin_lock_bh(&local->filter_lock); 78 changed_flags = local->filter_flags ^ new_flags; 79 80 mc = drv_prepare_multicast(local, &local->mc_list); 81 spin_unlock_bh(&local->filter_lock); 82 83 /* be a bit nasty */ 84 new_flags |= (1<<31); 85 86 drv_configure_filter(local, changed_flags, &new_flags, mc); 87 88 WARN_ON(new_flags & (1<<31)); 89 90 local->filter_flags = new_flags & ~(1<<31); 91 } 92 93 static void ieee80211_reconfig_filter(struct work_struct *work) 94 { 95 struct ieee80211_local *local = 96 container_of(work, struct ieee80211_local, reconfig_filter); 97 98 ieee80211_configure_filter(local); 99 } 100 101 /* 102 * Returns true if we are logically configured to be on 103 * the operating channel AND the hardware-conf is currently 104 * configured on the operating channel. Compares channel-type 105 * as well. 106 */ 107 bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local) 108 { 109 struct ieee80211_channel *chan, *scan_chan; 110 enum nl80211_channel_type channel_type; 111 112 /* This logic needs to match logic in ieee80211_hw_config */ 113 if (local->scan_channel) { 114 chan = local->scan_channel; 115 /* If scanning on oper channel, use whatever channel-type 116 * is currently in use. 117 */ 118 if (chan == local->oper_channel) 119 channel_type = local->_oper_channel_type; 120 else 121 channel_type = NL80211_CHAN_NO_HT; 122 } else if (local->tmp_channel) { 123 chan = scan_chan = local->tmp_channel; 124 channel_type = local->tmp_channel_type; 125 } else { 126 chan = local->oper_channel; 127 channel_type = local->_oper_channel_type; 128 } 129 130 if (chan != local->oper_channel || 131 channel_type != local->_oper_channel_type) 132 return false; 133 134 /* Check current hardware-config against oper_channel. */ 135 if ((local->oper_channel != local->hw.conf.channel) || 136 (local->_oper_channel_type != local->hw.conf.channel_type)) 137 return false; 138 139 return true; 140 } 141 142 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 143 { 144 struct ieee80211_channel *chan, *scan_chan; 145 int ret = 0; 146 int power; 147 enum nl80211_channel_type channel_type; 148 u32 offchannel_flag; 149 150 might_sleep(); 151 152 scan_chan = local->scan_channel; 153 154 /* If this off-channel logic ever changes, ieee80211_on_oper_channel 155 * may need to change as well. 156 */ 157 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 158 if (scan_chan) { 159 chan = scan_chan; 160 /* If scanning on oper channel, use whatever channel-type 161 * is currently in use. 162 */ 163 if (chan == local->oper_channel) 164 channel_type = local->_oper_channel_type; 165 else 166 channel_type = NL80211_CHAN_NO_HT; 167 } else if (local->tmp_channel) { 168 chan = scan_chan = local->tmp_channel; 169 channel_type = local->tmp_channel_type; 170 } else { 171 chan = local->oper_channel; 172 channel_type = local->_oper_channel_type; 173 } 174 175 if (chan != local->oper_channel || 176 channel_type != local->_oper_channel_type) 177 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL; 178 else 179 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL; 180 181 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 182 183 if (offchannel_flag || chan != local->hw.conf.channel || 184 channel_type != local->hw.conf.channel_type) { 185 local->hw.conf.channel = chan; 186 local->hw.conf.channel_type = channel_type; 187 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 188 } 189 190 if (!conf_is_ht(&local->hw.conf)) { 191 /* 192 * mac80211.h documents that this is only valid 193 * when the channel is set to an HT type, and 194 * that otherwise STATIC is used. 195 */ 196 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC; 197 } else if (local->hw.conf.smps_mode != local->smps_mode) { 198 local->hw.conf.smps_mode = local->smps_mode; 199 changed |= IEEE80211_CONF_CHANGE_SMPS; 200 } 201 202 if ((local->scanning & SCAN_SW_SCANNING) || 203 (local->scanning & SCAN_HW_SCANNING)) 204 power = chan->max_power; 205 else 206 power = local->power_constr_level ? 207 (chan->max_power - local->power_constr_level) : 208 chan->max_power; 209 210 if (local->user_power_level >= 0) 211 power = min(power, local->user_power_level); 212 213 if (local->hw.conf.power_level != power) { 214 changed |= IEEE80211_CONF_CHANGE_POWER; 215 local->hw.conf.power_level = power; 216 } 217 218 if (changed && local->open_count) { 219 ret = drv_config(local, changed); 220 /* 221 * Goal: 222 * HW reconfiguration should never fail, the driver has told 223 * us what it can support so it should live up to that promise. 224 * 225 * Current status: 226 * rfkill is not integrated with mac80211 and a 227 * configuration command can thus fail if hardware rfkill 228 * is enabled 229 * 230 * FIXME: integrate rfkill with mac80211 and then add this 231 * WARN_ON() back 232 * 233 */ 234 /* WARN_ON(ret); */ 235 } 236 237 return ret; 238 } 239 240 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 241 u32 changed) 242 { 243 struct ieee80211_local *local = sdata->local; 244 static const u8 zero[ETH_ALEN] = { 0 }; 245 246 if (!changed) 247 return; 248 249 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 250 /* 251 * While not associated, claim a BSSID of all-zeroes 252 * so that drivers don't do any weird things with the 253 * BSSID at that time. 254 */ 255 if (sdata->vif.bss_conf.assoc) 256 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 257 else 258 sdata->vif.bss_conf.bssid = zero; 259 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 260 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 261 else if (sdata->vif.type == NL80211_IFTYPE_AP) 262 sdata->vif.bss_conf.bssid = sdata->vif.addr; 263 else if (sdata->vif.type == NL80211_IFTYPE_WDS) 264 sdata->vif.bss_conf.bssid = NULL; 265 else if (ieee80211_vif_is_mesh(&sdata->vif)) { 266 sdata->vif.bss_conf.bssid = zero; 267 } else { 268 WARN_ON(1); 269 return; 270 } 271 272 switch (sdata->vif.type) { 273 case NL80211_IFTYPE_AP: 274 case NL80211_IFTYPE_ADHOC: 275 case NL80211_IFTYPE_WDS: 276 case NL80211_IFTYPE_MESH_POINT: 277 break; 278 default: 279 /* do not warn to simplify caller in scan.c */ 280 changed &= ~BSS_CHANGED_BEACON_ENABLED; 281 if (WARN_ON(changed & BSS_CHANGED_BEACON)) 282 return; 283 break; 284 } 285 286 if (changed & BSS_CHANGED_BEACON_ENABLED) { 287 if (local->quiescing || !ieee80211_sdata_running(sdata) || 288 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) { 289 sdata->vif.bss_conf.enable_beacon = false; 290 } else { 291 /* 292 * Beacon should be enabled, but AP mode must 293 * check whether there is a beacon configured. 294 */ 295 switch (sdata->vif.type) { 296 case NL80211_IFTYPE_AP: 297 sdata->vif.bss_conf.enable_beacon = 298 !!sdata->u.ap.beacon; 299 break; 300 case NL80211_IFTYPE_ADHOC: 301 sdata->vif.bss_conf.enable_beacon = 302 !!sdata->u.ibss.presp; 303 break; 304 #ifdef CONFIG_MAC80211_MESH 305 case NL80211_IFTYPE_MESH_POINT: 306 sdata->vif.bss_conf.enable_beacon = 307 !!sdata->u.mesh.mesh_id_len; 308 break; 309 #endif 310 default: 311 /* not reached */ 312 WARN_ON(1); 313 break; 314 } 315 } 316 } 317 318 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed); 319 } 320 321 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 322 { 323 sdata->vif.bss_conf.use_cts_prot = false; 324 sdata->vif.bss_conf.use_short_preamble = false; 325 sdata->vif.bss_conf.use_short_slot = false; 326 return BSS_CHANGED_ERP_CTS_PROT | 327 BSS_CHANGED_ERP_PREAMBLE | 328 BSS_CHANGED_ERP_SLOT; 329 } 330 331 static void ieee80211_tasklet_handler(unsigned long data) 332 { 333 struct ieee80211_local *local = (struct ieee80211_local *) data; 334 struct sk_buff *skb; 335 336 while ((skb = skb_dequeue(&local->skb_queue)) || 337 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 338 switch (skb->pkt_type) { 339 case IEEE80211_RX_MSG: 340 /* Clear skb->pkt_type in order to not confuse kernel 341 * netstack. */ 342 skb->pkt_type = 0; 343 ieee80211_rx(local_to_hw(local), skb); 344 break; 345 case IEEE80211_TX_STATUS_MSG: 346 skb->pkt_type = 0; 347 ieee80211_tx_status(local_to_hw(local), skb); 348 break; 349 default: 350 WARN(1, "mac80211: Packet is of unknown type %d\n", 351 skb->pkt_type); 352 dev_kfree_skb(skb); 353 break; 354 } 355 } 356 } 357 358 static void ieee80211_restart_work(struct work_struct *work) 359 { 360 struct ieee80211_local *local = 361 container_of(work, struct ieee80211_local, restart_work); 362 363 /* wait for scan work complete */ 364 flush_workqueue(local->workqueue); 365 366 mutex_lock(&local->mtx); 367 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning), 368 "%s called with hardware scan in progress\n", __func__); 369 mutex_unlock(&local->mtx); 370 371 rtnl_lock(); 372 ieee80211_scan_cancel(local); 373 ieee80211_reconfig(local); 374 rtnl_unlock(); 375 } 376 377 void ieee80211_restart_hw(struct ieee80211_hw *hw) 378 { 379 struct ieee80211_local *local = hw_to_local(hw); 380 381 trace_api_restart_hw(local); 382 383 wiphy_info(hw->wiphy, 384 "Hardware restart was requested\n"); 385 386 /* use this reason, ieee80211_reconfig will unblock it */ 387 ieee80211_stop_queues_by_reason(hw, 388 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 389 390 schedule_work(&local->restart_work); 391 } 392 EXPORT_SYMBOL(ieee80211_restart_hw); 393 394 static void ieee80211_recalc_smps_work(struct work_struct *work) 395 { 396 struct ieee80211_local *local = 397 container_of(work, struct ieee80211_local, recalc_smps); 398 399 mutex_lock(&local->iflist_mtx); 400 ieee80211_recalc_smps(local); 401 mutex_unlock(&local->iflist_mtx); 402 } 403 404 #ifdef CONFIG_INET 405 static int ieee80211_ifa_changed(struct notifier_block *nb, 406 unsigned long data, void *arg) 407 { 408 struct in_ifaddr *ifa = arg; 409 struct ieee80211_local *local = 410 container_of(nb, struct ieee80211_local, 411 ifa_notifier); 412 struct net_device *ndev = ifa->ifa_dev->dev; 413 struct wireless_dev *wdev = ndev->ieee80211_ptr; 414 struct in_device *idev; 415 struct ieee80211_sub_if_data *sdata; 416 struct ieee80211_bss_conf *bss_conf; 417 struct ieee80211_if_managed *ifmgd; 418 int c = 0; 419 420 /* Make sure it's our interface that got changed */ 421 if (!wdev) 422 return NOTIFY_DONE; 423 424 if (wdev->wiphy != local->hw.wiphy) 425 return NOTIFY_DONE; 426 427 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 428 bss_conf = &sdata->vif.bss_conf; 429 430 if (!ieee80211_sdata_running(sdata)) 431 return NOTIFY_DONE; 432 433 /* ARP filtering is only supported in managed mode */ 434 if (sdata->vif.type != NL80211_IFTYPE_STATION) 435 return NOTIFY_DONE; 436 437 idev = __in_dev_get_rtnl(sdata->dev); 438 if (!idev) 439 return NOTIFY_DONE; 440 441 ifmgd = &sdata->u.mgd; 442 mutex_lock(&ifmgd->mtx); 443 444 /* Copy the addresses to the bss_conf list */ 445 ifa = idev->ifa_list; 446 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) { 447 bss_conf->arp_addr_list[c] = ifa->ifa_address; 448 ifa = ifa->ifa_next; 449 c++; 450 } 451 452 /* If not all addresses fit the list, disable filtering */ 453 if (ifa) { 454 sdata->arp_filter_state = false; 455 c = 0; 456 } else { 457 sdata->arp_filter_state = true; 458 } 459 bss_conf->arp_addr_cnt = c; 460 461 /* Configure driver only if associated */ 462 if (ifmgd->associated) { 463 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 464 ieee80211_bss_info_change_notify(sdata, 465 BSS_CHANGED_ARP_FILTER); 466 } 467 468 mutex_unlock(&ifmgd->mtx); 469 470 return NOTIFY_DONE; 471 } 472 #endif 473 474 static int ieee80211_napi_poll(struct napi_struct *napi, int budget) 475 { 476 struct ieee80211_local *local = 477 container_of(napi, struct ieee80211_local, napi); 478 479 return local->ops->napi_poll(&local->hw, budget); 480 } 481 482 void ieee80211_napi_schedule(struct ieee80211_hw *hw) 483 { 484 struct ieee80211_local *local = hw_to_local(hw); 485 486 napi_schedule(&local->napi); 487 } 488 EXPORT_SYMBOL(ieee80211_napi_schedule); 489 490 void ieee80211_napi_complete(struct ieee80211_hw *hw) 491 { 492 struct ieee80211_local *local = hw_to_local(hw); 493 494 napi_complete(&local->napi); 495 } 496 EXPORT_SYMBOL(ieee80211_napi_complete); 497 498 /* There isn't a lot of sense in it, but you can transmit anything you like */ 499 static const struct ieee80211_txrx_stypes 500 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = { 501 [NL80211_IFTYPE_ADHOC] = { 502 .tx = 0xffff, 503 .rx = BIT(IEEE80211_STYPE_ACTION >> 4), 504 }, 505 [NL80211_IFTYPE_STATION] = { 506 .tx = 0xffff, 507 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 508 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 509 }, 510 [NL80211_IFTYPE_AP] = { 511 .tx = 0xffff, 512 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 513 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 514 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 515 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 516 BIT(IEEE80211_STYPE_AUTH >> 4) | 517 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 518 BIT(IEEE80211_STYPE_ACTION >> 4), 519 }, 520 [NL80211_IFTYPE_AP_VLAN] = { 521 /* copy AP */ 522 .tx = 0xffff, 523 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 524 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 525 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 526 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 527 BIT(IEEE80211_STYPE_AUTH >> 4) | 528 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 529 BIT(IEEE80211_STYPE_ACTION >> 4), 530 }, 531 [NL80211_IFTYPE_P2P_CLIENT] = { 532 .tx = 0xffff, 533 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 534 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 535 }, 536 [NL80211_IFTYPE_P2P_GO] = { 537 .tx = 0xffff, 538 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 539 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 540 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 541 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 542 BIT(IEEE80211_STYPE_AUTH >> 4) | 543 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 544 BIT(IEEE80211_STYPE_ACTION >> 4), 545 }, 546 [NL80211_IFTYPE_MESH_POINT] = { 547 .tx = 0xffff, 548 .rx = BIT(IEEE80211_STYPE_ACTION >> 4), 549 }, 550 }; 551 552 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 553 const struct ieee80211_ops *ops) 554 { 555 struct ieee80211_local *local; 556 int priv_size, i; 557 struct wiphy *wiphy; 558 559 /* Ensure 32-byte alignment of our private data and hw private data. 560 * We use the wiphy priv data for both our ieee80211_local and for 561 * the driver's private data 562 * 563 * In memory it'll be like this: 564 * 565 * +-------------------------+ 566 * | struct wiphy | 567 * +-------------------------+ 568 * | struct ieee80211_local | 569 * +-------------------------+ 570 * | driver's private data | 571 * +-------------------------+ 572 * 573 */ 574 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; 575 576 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 577 578 if (!wiphy) 579 return NULL; 580 581 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes; 582 583 wiphy->privid = mac80211_wiphy_privid; 584 585 wiphy->flags |= WIPHY_FLAG_NETNS_OK | 586 WIPHY_FLAG_4ADDR_AP | 587 WIPHY_FLAG_4ADDR_STATION | 588 WIPHY_FLAG_SUPPORTS_SEPARATE_DEFAULT_KEYS; 589 590 if (!ops->set_key) 591 wiphy->flags |= WIPHY_FLAG_IBSS_RSN; 592 593 wiphy->bss_priv_size = sizeof(struct ieee80211_bss); 594 595 local = wiphy_priv(wiphy); 596 597 local->hw.wiphy = wiphy; 598 599 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 600 601 BUG_ON(!ops->tx); 602 BUG_ON(!ops->start); 603 BUG_ON(!ops->stop); 604 BUG_ON(!ops->config); 605 BUG_ON(!ops->add_interface); 606 BUG_ON(!ops->remove_interface); 607 BUG_ON(!ops->configure_filter); 608 local->ops = ops; 609 610 /* set up some defaults */ 611 local->hw.queues = 1; 612 local->hw.max_rates = 1; 613 local->hw.max_report_rates = 0; 614 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 615 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 616 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 617 local->user_power_level = -1; 618 local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES; 619 local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN; 620 621 INIT_LIST_HEAD(&local->interfaces); 622 623 __hw_addr_init(&local->mc_list); 624 625 mutex_init(&local->iflist_mtx); 626 mutex_init(&local->mtx); 627 628 mutex_init(&local->key_mtx); 629 spin_lock_init(&local->filter_lock); 630 spin_lock_init(&local->queue_stop_reason_lock); 631 632 /* 633 * The rx_skb_queue is only accessed from tasklets, 634 * but other SKB queues are used from within IRQ 635 * context. Therefore, this one needs a different 636 * locking class so our direct, non-irq-safe use of 637 * the queue's lock doesn't throw lockdep warnings. 638 */ 639 skb_queue_head_init_class(&local->rx_skb_queue, 640 &ieee80211_rx_skb_queue_class); 641 642 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 643 644 ieee80211_work_init(local); 645 646 INIT_WORK(&local->restart_work, ieee80211_restart_work); 647 648 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter); 649 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work); 650 local->smps_mode = IEEE80211_SMPS_OFF; 651 652 INIT_WORK(&local->dynamic_ps_enable_work, 653 ieee80211_dynamic_ps_enable_work); 654 INIT_WORK(&local->dynamic_ps_disable_work, 655 ieee80211_dynamic_ps_disable_work); 656 setup_timer(&local->dynamic_ps_timer, 657 ieee80211_dynamic_ps_timer, (unsigned long) local); 658 659 sta_info_init(local); 660 661 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 662 skb_queue_head_init(&local->pending[i]); 663 atomic_set(&local->agg_queue_stop[i], 0); 664 } 665 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 666 (unsigned long)local); 667 668 tasklet_init(&local->tasklet, 669 ieee80211_tasklet_handler, 670 (unsigned long) local); 671 672 skb_queue_head_init(&local->skb_queue); 673 skb_queue_head_init(&local->skb_queue_unreliable); 674 675 /* init dummy netdev for use w/ NAPI */ 676 init_dummy_netdev(&local->napi_dev); 677 678 ieee80211_led_names(local); 679 680 ieee80211_hw_roc_setup(local); 681 682 return local_to_hw(local); 683 } 684 EXPORT_SYMBOL(ieee80211_alloc_hw); 685 686 int ieee80211_register_hw(struct ieee80211_hw *hw) 687 { 688 struct ieee80211_local *local = hw_to_local(hw); 689 int result; 690 enum ieee80211_band band; 691 int channels, max_bitrates; 692 bool supp_ht; 693 static const u32 cipher_suites[] = { 694 /* keep WEP first, it may be removed below */ 695 WLAN_CIPHER_SUITE_WEP40, 696 WLAN_CIPHER_SUITE_WEP104, 697 WLAN_CIPHER_SUITE_TKIP, 698 WLAN_CIPHER_SUITE_CCMP, 699 700 /* keep last -- depends on hw flags! */ 701 WLAN_CIPHER_SUITE_AES_CMAC 702 }; 703 704 if (hw->max_report_rates == 0) 705 hw->max_report_rates = hw->max_rates; 706 707 /* 708 * generic code guarantees at least one band, 709 * set this very early because much code assumes 710 * that hw.conf.channel is assigned 711 */ 712 channels = 0; 713 max_bitrates = 0; 714 supp_ht = false; 715 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 716 struct ieee80211_supported_band *sband; 717 718 sband = local->hw.wiphy->bands[band]; 719 if (!sband) 720 continue; 721 if (!local->oper_channel) { 722 /* init channel we're on */ 723 local->hw.conf.channel = 724 local->oper_channel = &sband->channels[0]; 725 local->hw.conf.channel_type = NL80211_CHAN_NO_HT; 726 } 727 channels += sband->n_channels; 728 729 /* 730 * Since ieee80211_disable_40mhz_24ghz is global, we can 731 * modify the sband's ht data even if the driver uses a 732 * global structure for that. 733 */ 734 if (ieee80211_disable_40mhz_24ghz && 735 band == IEEE80211_BAND_2GHZ && 736 sband->ht_cap.ht_supported) { 737 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 738 sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; 739 } 740 741 if (max_bitrates < sband->n_bitrates) 742 max_bitrates = sband->n_bitrates; 743 supp_ht = supp_ht || sband->ht_cap.ht_supported; 744 } 745 746 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) + 747 sizeof(void *) * channels, GFP_KERNEL); 748 if (!local->int_scan_req) 749 return -ENOMEM; 750 751 /* if low-level driver supports AP, we also support VLAN */ 752 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) 753 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 754 755 /* mac80211 always supports monitor */ 756 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 757 758 #ifndef CONFIG_MAC80211_MESH 759 /* mesh depends on Kconfig, but drivers should set it if they want */ 760 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT); 761 #endif 762 763 /* mac80211 supports control port protocol changing */ 764 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL; 765 766 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 767 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 768 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 769 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 770 771 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) 772 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK), 773 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"); 774 775 /* 776 * Calculate scan IE length -- we need this to alloc 777 * memory and to subtract from the driver limit. It 778 * includes the DS Params, (extended) supported rates, and HT 779 * information -- SSID is the driver's responsibility. 780 */ 781 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ + 782 3 /* DS Params */; 783 if (supp_ht) 784 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 785 786 if (!local->ops->hw_scan) { 787 /* For hw_scan, driver needs to set these up. */ 788 local->hw.wiphy->max_scan_ssids = 4; 789 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 790 } 791 792 /* 793 * If the driver supports any scan IEs, then assume the 794 * limit includes the IEs mac80211 will add, otherwise 795 * leave it at zero and let the driver sort it out; we 796 * still pass our IEs to the driver but userspace will 797 * not be allowed to in that case. 798 */ 799 if (local->hw.wiphy->max_scan_ie_len) 800 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 801 802 /* Set up cipher suites unless driver already did */ 803 if (!local->hw.wiphy->cipher_suites) { 804 local->hw.wiphy->cipher_suites = cipher_suites; 805 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 806 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) 807 local->hw.wiphy->n_cipher_suites--; 808 } 809 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) { 810 if (local->hw.wiphy->cipher_suites == cipher_suites) { 811 local->hw.wiphy->cipher_suites += 2; 812 local->hw.wiphy->n_cipher_suites -= 2; 813 } else { 814 u32 *suites; 815 int r, w = 0; 816 817 /* Filter out WEP */ 818 819 suites = kmemdup( 820 local->hw.wiphy->cipher_suites, 821 sizeof(u32) * local->hw.wiphy->n_cipher_suites, 822 GFP_KERNEL); 823 if (!suites) 824 return -ENOMEM; 825 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) { 826 u32 suite = local->hw.wiphy->cipher_suites[r]; 827 if (suite == WLAN_CIPHER_SUITE_WEP40 || 828 suite == WLAN_CIPHER_SUITE_WEP104) 829 continue; 830 suites[w++] = suite; 831 } 832 local->hw.wiphy->cipher_suites = suites; 833 local->hw.wiphy->n_cipher_suites = w; 834 local->wiphy_ciphers_allocated = true; 835 } 836 } 837 838 if (!local->ops->remain_on_channel) 839 local->hw.wiphy->max_remain_on_channel_duration = 5000; 840 841 result = wiphy_register(local->hw.wiphy); 842 if (result < 0) 843 goto fail_wiphy_register; 844 845 /* 846 * We use the number of queues for feature tests (QoS, HT) internally 847 * so restrict them appropriately. 848 */ 849 if (hw->queues > IEEE80211_MAX_QUEUES) 850 hw->queues = IEEE80211_MAX_QUEUES; 851 852 local->workqueue = 853 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0); 854 if (!local->workqueue) { 855 result = -ENOMEM; 856 goto fail_workqueue; 857 } 858 859 /* 860 * The hardware needs headroom for sending the frame, 861 * and we need some headroom for passing the frame to monitor 862 * interfaces, but never both at the same time. 863 */ 864 BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM != 865 sizeof(struct ieee80211_tx_status_rtap_hdr)); 866 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 867 sizeof(struct ieee80211_tx_status_rtap_hdr)); 868 869 debugfs_hw_add(local); 870 871 /* 872 * if the driver doesn't specify a max listen interval we 873 * use 5 which should be a safe default 874 */ 875 if (local->hw.max_listen_interval == 0) 876 local->hw.max_listen_interval = 5; 877 878 local->hw.conf.listen_interval = local->hw.max_listen_interval; 879 880 local->dynamic_ps_forced_timeout = -1; 881 882 result = sta_info_start(local); 883 if (result < 0) 884 goto fail_sta_info; 885 886 result = ieee80211_wep_init(local); 887 if (result < 0) 888 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n", 889 result); 890 891 rtnl_lock(); 892 893 result = ieee80211_init_rate_ctrl_alg(local, 894 hw->rate_control_algorithm); 895 if (result < 0) { 896 wiphy_debug(local->hw.wiphy, 897 "Failed to initialize rate control algorithm\n"); 898 goto fail_rate; 899 } 900 901 /* add one default STA interface if supported */ 902 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 903 result = ieee80211_if_add(local, "wlan%d", NULL, 904 NL80211_IFTYPE_STATION, NULL); 905 if (result) 906 wiphy_warn(local->hw.wiphy, 907 "Failed to add default virtual iface\n"); 908 } 909 910 rtnl_unlock(); 911 912 ieee80211_led_init(local); 913 914 local->network_latency_notifier.notifier_call = 915 ieee80211_max_network_latency; 916 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 917 &local->network_latency_notifier); 918 if (result) { 919 rtnl_lock(); 920 goto fail_pm_qos; 921 } 922 923 #ifdef CONFIG_INET 924 local->ifa_notifier.notifier_call = ieee80211_ifa_changed; 925 result = register_inetaddr_notifier(&local->ifa_notifier); 926 if (result) 927 goto fail_ifa; 928 #endif 929 930 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll, 931 local->hw.napi_weight); 932 933 return 0; 934 935 #ifdef CONFIG_INET 936 fail_ifa: 937 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 938 &local->network_latency_notifier); 939 rtnl_lock(); 940 #endif 941 fail_pm_qos: 942 ieee80211_led_exit(local); 943 ieee80211_remove_interfaces(local); 944 fail_rate: 945 rtnl_unlock(); 946 ieee80211_wep_free(local); 947 sta_info_stop(local); 948 fail_sta_info: 949 destroy_workqueue(local->workqueue); 950 fail_workqueue: 951 wiphy_unregister(local->hw.wiphy); 952 fail_wiphy_register: 953 if (local->wiphy_ciphers_allocated) 954 kfree(local->hw.wiphy->cipher_suites); 955 kfree(local->int_scan_req); 956 return result; 957 } 958 EXPORT_SYMBOL(ieee80211_register_hw); 959 960 void ieee80211_unregister_hw(struct ieee80211_hw *hw) 961 { 962 struct ieee80211_local *local = hw_to_local(hw); 963 964 tasklet_kill(&local->tx_pending_tasklet); 965 tasklet_kill(&local->tasklet); 966 967 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 968 &local->network_latency_notifier); 969 #ifdef CONFIG_INET 970 unregister_inetaddr_notifier(&local->ifa_notifier); 971 #endif 972 973 rtnl_lock(); 974 975 /* 976 * At this point, interface list manipulations are fine 977 * because the driver cannot be handing us frames any 978 * more and the tasklet is killed. 979 */ 980 ieee80211_remove_interfaces(local); 981 982 rtnl_unlock(); 983 984 /* 985 * Now all work items will be gone, but the 986 * timer might still be armed, so delete it 987 */ 988 del_timer_sync(&local->work_timer); 989 990 cancel_work_sync(&local->restart_work); 991 cancel_work_sync(&local->reconfig_filter); 992 993 ieee80211_clear_tx_pending(local); 994 sta_info_stop(local); 995 rate_control_deinitialize(local); 996 997 if (skb_queue_len(&local->skb_queue) || 998 skb_queue_len(&local->skb_queue_unreliable)) 999 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n"); 1000 skb_queue_purge(&local->skb_queue); 1001 skb_queue_purge(&local->skb_queue_unreliable); 1002 skb_queue_purge(&local->rx_skb_queue); 1003 1004 destroy_workqueue(local->workqueue); 1005 wiphy_unregister(local->hw.wiphy); 1006 ieee80211_wep_free(local); 1007 ieee80211_led_exit(local); 1008 kfree(local->int_scan_req); 1009 } 1010 EXPORT_SYMBOL(ieee80211_unregister_hw); 1011 1012 void ieee80211_free_hw(struct ieee80211_hw *hw) 1013 { 1014 struct ieee80211_local *local = hw_to_local(hw); 1015 1016 mutex_destroy(&local->iflist_mtx); 1017 mutex_destroy(&local->mtx); 1018 1019 if (local->wiphy_ciphers_allocated) 1020 kfree(local->hw.wiphy->cipher_suites); 1021 1022 wiphy_free(local->hw.wiphy); 1023 } 1024 EXPORT_SYMBOL(ieee80211_free_hw); 1025 1026 static int __init ieee80211_init(void) 1027 { 1028 struct sk_buff *skb; 1029 int ret; 1030 1031 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1032 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1033 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1034 1035 ret = rc80211_minstrel_init(); 1036 if (ret) 1037 return ret; 1038 1039 ret = rc80211_minstrel_ht_init(); 1040 if (ret) 1041 goto err_minstrel; 1042 1043 ret = rc80211_pid_init(); 1044 if (ret) 1045 goto err_pid; 1046 1047 ret = ieee80211_iface_init(); 1048 if (ret) 1049 goto err_netdev; 1050 1051 return 0; 1052 err_netdev: 1053 rc80211_pid_exit(); 1054 err_pid: 1055 rc80211_minstrel_ht_exit(); 1056 err_minstrel: 1057 rc80211_minstrel_exit(); 1058 1059 return ret; 1060 } 1061 1062 static void __exit ieee80211_exit(void) 1063 { 1064 rc80211_pid_exit(); 1065 rc80211_minstrel_ht_exit(); 1066 rc80211_minstrel_exit(); 1067 1068 if (mesh_allocated) 1069 ieee80211s_stop(); 1070 1071 ieee80211_iface_exit(); 1072 } 1073 1074 1075 subsys_initcall(ieee80211_init); 1076 module_exit(ieee80211_exit); 1077 1078 MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1079 MODULE_LICENSE("GPL"); 1080