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 || test_bit(SCAN_SW_SCANNING, &local->scanning) || 51 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) 52 new_flags |= FIF_BCN_PRBRESP_PROMISC; 53 54 if (local->fif_probe_req || local->probe_req_reg) 55 new_flags |= FIF_PROBE_REQ; 56 57 if (local->fif_fcsfail) 58 new_flags |= FIF_FCSFAIL; 59 60 if (local->fif_plcpfail) 61 new_flags |= FIF_PLCPFAIL; 62 63 if (local->fif_control) 64 new_flags |= FIF_CONTROL; 65 66 if (local->fif_other_bss) 67 new_flags |= FIF_OTHER_BSS; 68 69 if (local->fif_pspoll) 70 new_flags |= FIF_PSPOLL; 71 72 spin_lock_bh(&local->filter_lock); 73 changed_flags = local->filter_flags ^ new_flags; 74 75 mc = drv_prepare_multicast(local, &local->mc_list); 76 spin_unlock_bh(&local->filter_lock); 77 78 /* be a bit nasty */ 79 new_flags |= (1<<31); 80 81 drv_configure_filter(local, changed_flags, &new_flags, mc); 82 83 WARN_ON(new_flags & (1<<31)); 84 85 local->filter_flags = new_flags & ~(1<<31); 86 } 87 88 static void ieee80211_reconfig_filter(struct work_struct *work) 89 { 90 struct ieee80211_local *local = 91 container_of(work, struct ieee80211_local, reconfig_filter); 92 93 ieee80211_configure_filter(local); 94 } 95 96 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 97 { 98 struct ieee80211_channel *chan; 99 int ret = 0; 100 int power; 101 enum nl80211_channel_type channel_type; 102 u32 offchannel_flag; 103 104 might_sleep(); 105 106 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 107 if (local->scan_channel) { 108 chan = local->scan_channel; 109 /* If scanning on oper channel, use whatever channel-type 110 * is currently in use. 111 */ 112 if (chan == local->oper_channel) 113 channel_type = local->_oper_channel_type; 114 else 115 channel_type = NL80211_CHAN_NO_HT; 116 } else if (local->tmp_channel) { 117 chan = local->tmp_channel; 118 channel_type = local->tmp_channel_type; 119 } else { 120 chan = local->oper_channel; 121 channel_type = local->_oper_channel_type; 122 } 123 124 if (chan != local->oper_channel || 125 channel_type != local->_oper_channel_type) 126 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL; 127 else 128 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL; 129 130 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 131 132 if (offchannel_flag || chan != local->hw.conf.channel || 133 channel_type != local->hw.conf.channel_type) { 134 local->hw.conf.channel = chan; 135 local->hw.conf.channel_type = channel_type; 136 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 137 } 138 139 if (!conf_is_ht(&local->hw.conf)) { 140 /* 141 * mac80211.h documents that this is only valid 142 * when the channel is set to an HT type, and 143 * that otherwise STATIC is used. 144 */ 145 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC; 146 } else if (local->hw.conf.smps_mode != local->smps_mode) { 147 local->hw.conf.smps_mode = local->smps_mode; 148 changed |= IEEE80211_CONF_CHANGE_SMPS; 149 } 150 151 if (test_bit(SCAN_SW_SCANNING, &local->scanning) || 152 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) || 153 test_bit(SCAN_HW_SCANNING, &local->scanning)) 154 power = chan->max_power; 155 else 156 power = local->power_constr_level ? 157 min(chan->max_power, 158 (chan->max_reg_power - local->power_constr_level)) : 159 chan->max_power; 160 161 if (local->user_power_level >= 0) 162 power = min(power, local->user_power_level); 163 164 if (local->hw.conf.power_level != power) { 165 changed |= IEEE80211_CONF_CHANGE_POWER; 166 local->hw.conf.power_level = power; 167 } 168 169 if (changed && local->open_count) { 170 ret = drv_config(local, changed); 171 /* 172 * Goal: 173 * HW reconfiguration should never fail, the driver has told 174 * us what it can support so it should live up to that promise. 175 * 176 * Current status: 177 * rfkill is not integrated with mac80211 and a 178 * configuration command can thus fail if hardware rfkill 179 * is enabled 180 * 181 * FIXME: integrate rfkill with mac80211 and then add this 182 * WARN_ON() back 183 * 184 */ 185 /* WARN_ON(ret); */ 186 } 187 188 return ret; 189 } 190 191 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 192 u32 changed) 193 { 194 struct ieee80211_local *local = sdata->local; 195 static const u8 zero[ETH_ALEN] = { 0 }; 196 197 if (!changed) 198 return; 199 200 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 201 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 202 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 203 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 204 else if (sdata->vif.type == NL80211_IFTYPE_AP) 205 sdata->vif.bss_conf.bssid = sdata->vif.addr; 206 else if (sdata->vif.type == NL80211_IFTYPE_WDS) 207 sdata->vif.bss_conf.bssid = NULL; 208 else if (ieee80211_vif_is_mesh(&sdata->vif)) { 209 sdata->vif.bss_conf.bssid = zero; 210 } else { 211 WARN_ON(1); 212 return; 213 } 214 215 switch (sdata->vif.type) { 216 case NL80211_IFTYPE_AP: 217 case NL80211_IFTYPE_ADHOC: 218 case NL80211_IFTYPE_WDS: 219 case NL80211_IFTYPE_MESH_POINT: 220 break; 221 default: 222 /* do not warn to simplify caller in scan.c */ 223 changed &= ~BSS_CHANGED_BEACON_ENABLED; 224 if (WARN_ON(changed & BSS_CHANGED_BEACON)) 225 return; 226 break; 227 } 228 229 if (changed & BSS_CHANGED_BEACON_ENABLED) { 230 if (local->quiescing || !ieee80211_sdata_running(sdata) || 231 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) { 232 sdata->vif.bss_conf.enable_beacon = false; 233 } else { 234 /* 235 * Beacon should be enabled, but AP mode must 236 * check whether there is a beacon configured. 237 */ 238 switch (sdata->vif.type) { 239 case NL80211_IFTYPE_AP: 240 sdata->vif.bss_conf.enable_beacon = 241 !!sdata->u.ap.beacon; 242 break; 243 case NL80211_IFTYPE_ADHOC: 244 sdata->vif.bss_conf.enable_beacon = 245 !!sdata->u.ibss.presp; 246 break; 247 #ifdef CONFIG_MAC80211_MESH 248 case NL80211_IFTYPE_MESH_POINT: 249 sdata->vif.bss_conf.enable_beacon = 250 !!sdata->u.mesh.mesh_id_len; 251 break; 252 #endif 253 default: 254 /* not reached */ 255 WARN_ON(1); 256 break; 257 } 258 } 259 } 260 261 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed); 262 } 263 264 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 265 { 266 sdata->vif.bss_conf.use_cts_prot = false; 267 sdata->vif.bss_conf.use_short_preamble = false; 268 sdata->vif.bss_conf.use_short_slot = false; 269 return BSS_CHANGED_ERP_CTS_PROT | 270 BSS_CHANGED_ERP_PREAMBLE | 271 BSS_CHANGED_ERP_SLOT; 272 } 273 274 static void ieee80211_tasklet_handler(unsigned long data) 275 { 276 struct ieee80211_local *local = (struct ieee80211_local *) data; 277 struct sta_info *sta, *tmp; 278 struct skb_eosp_msg_data *eosp_data; 279 struct sk_buff *skb; 280 281 while ((skb = skb_dequeue(&local->skb_queue)) || 282 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 283 switch (skb->pkt_type) { 284 case IEEE80211_RX_MSG: 285 /* Clear skb->pkt_type in order to not confuse kernel 286 * netstack. */ 287 skb->pkt_type = 0; 288 ieee80211_rx(&local->hw, skb); 289 break; 290 case IEEE80211_TX_STATUS_MSG: 291 skb->pkt_type = 0; 292 ieee80211_tx_status(&local->hw, skb); 293 break; 294 case IEEE80211_EOSP_MSG: 295 eosp_data = (void *)skb->cb; 296 for_each_sta_info(local, eosp_data->sta, sta, tmp) { 297 /* skip wrong virtual interface */ 298 if (memcmp(eosp_data->iface, 299 sta->sdata->vif.addr, ETH_ALEN)) 300 continue; 301 clear_sta_flag(sta, WLAN_STA_SP); 302 break; 303 } 304 dev_kfree_skb(skb); 305 break; 306 default: 307 WARN(1, "mac80211: Packet is of unknown type %d\n", 308 skb->pkt_type); 309 dev_kfree_skb(skb); 310 break; 311 } 312 } 313 } 314 315 static void ieee80211_restart_work(struct work_struct *work) 316 { 317 struct ieee80211_local *local = 318 container_of(work, struct ieee80211_local, restart_work); 319 320 /* wait for scan work complete */ 321 flush_workqueue(local->workqueue); 322 323 mutex_lock(&local->mtx); 324 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) || 325 rcu_dereference_protected(local->sched_scan_sdata, 326 lockdep_is_held(&local->mtx)), 327 "%s called with hardware scan in progress\n", __func__); 328 mutex_unlock(&local->mtx); 329 330 rtnl_lock(); 331 ieee80211_scan_cancel(local); 332 ieee80211_reconfig(local); 333 rtnl_unlock(); 334 } 335 336 void ieee80211_restart_hw(struct ieee80211_hw *hw) 337 { 338 struct ieee80211_local *local = hw_to_local(hw); 339 340 trace_api_restart_hw(local); 341 342 wiphy_info(hw->wiphy, 343 "Hardware restart was requested\n"); 344 345 /* use this reason, ieee80211_reconfig will unblock it */ 346 ieee80211_stop_queues_by_reason(hw, 347 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 348 349 /* 350 * Stop all Rx during the reconfig. We don't want state changes 351 * or driver callbacks while this is in progress. 352 */ 353 local->in_reconfig = true; 354 barrier(); 355 356 schedule_work(&local->restart_work); 357 } 358 EXPORT_SYMBOL(ieee80211_restart_hw); 359 360 static void ieee80211_recalc_smps_work(struct work_struct *work) 361 { 362 struct ieee80211_local *local = 363 container_of(work, struct ieee80211_local, recalc_smps); 364 365 mutex_lock(&local->iflist_mtx); 366 ieee80211_recalc_smps(local); 367 mutex_unlock(&local->iflist_mtx); 368 } 369 370 #ifdef CONFIG_INET 371 static int ieee80211_ifa_changed(struct notifier_block *nb, 372 unsigned long data, void *arg) 373 { 374 struct in_ifaddr *ifa = arg; 375 struct ieee80211_local *local = 376 container_of(nb, struct ieee80211_local, 377 ifa_notifier); 378 struct net_device *ndev = ifa->ifa_dev->dev; 379 struct wireless_dev *wdev = ndev->ieee80211_ptr; 380 struct in_device *idev; 381 struct ieee80211_sub_if_data *sdata; 382 struct ieee80211_bss_conf *bss_conf; 383 struct ieee80211_if_managed *ifmgd; 384 int c = 0; 385 386 /* Make sure it's our interface that got changed */ 387 if (!wdev) 388 return NOTIFY_DONE; 389 390 if (wdev->wiphy != local->hw.wiphy) 391 return NOTIFY_DONE; 392 393 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 394 bss_conf = &sdata->vif.bss_conf; 395 396 /* ARP filtering is only supported in managed mode */ 397 if (sdata->vif.type != NL80211_IFTYPE_STATION) 398 return NOTIFY_DONE; 399 400 idev = __in_dev_get_rtnl(sdata->dev); 401 if (!idev) 402 return NOTIFY_DONE; 403 404 ifmgd = &sdata->u.mgd; 405 mutex_lock(&ifmgd->mtx); 406 407 /* Copy the addresses to the bss_conf list */ 408 ifa = idev->ifa_list; 409 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) { 410 bss_conf->arp_addr_list[c] = ifa->ifa_address; 411 ifa = ifa->ifa_next; 412 c++; 413 } 414 415 /* If not all addresses fit the list, disable filtering */ 416 if (ifa) { 417 sdata->arp_filter_state = false; 418 c = 0; 419 } else { 420 sdata->arp_filter_state = true; 421 } 422 bss_conf->arp_addr_cnt = c; 423 424 /* Configure driver only if associated (which also implies it is up) */ 425 if (ifmgd->associated) { 426 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 427 ieee80211_bss_info_change_notify(sdata, 428 BSS_CHANGED_ARP_FILTER); 429 } 430 431 mutex_unlock(&ifmgd->mtx); 432 433 return NOTIFY_DONE; 434 } 435 #endif 436 437 static int ieee80211_napi_poll(struct napi_struct *napi, int budget) 438 { 439 struct ieee80211_local *local = 440 container_of(napi, struct ieee80211_local, napi); 441 442 return local->ops->napi_poll(&local->hw, budget); 443 } 444 445 void ieee80211_napi_schedule(struct ieee80211_hw *hw) 446 { 447 struct ieee80211_local *local = hw_to_local(hw); 448 449 napi_schedule(&local->napi); 450 } 451 EXPORT_SYMBOL(ieee80211_napi_schedule); 452 453 void ieee80211_napi_complete(struct ieee80211_hw *hw) 454 { 455 struct ieee80211_local *local = hw_to_local(hw); 456 457 napi_complete(&local->napi); 458 } 459 EXPORT_SYMBOL(ieee80211_napi_complete); 460 461 /* There isn't a lot of sense in it, but you can transmit anything you like */ 462 static const struct ieee80211_txrx_stypes 463 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = { 464 [NL80211_IFTYPE_ADHOC] = { 465 .tx = 0xffff, 466 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 467 BIT(IEEE80211_STYPE_AUTH >> 4) | 468 BIT(IEEE80211_STYPE_DEAUTH >> 4), 469 }, 470 [NL80211_IFTYPE_STATION] = { 471 .tx = 0xffff, 472 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 473 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 474 }, 475 [NL80211_IFTYPE_AP] = { 476 .tx = 0xffff, 477 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 478 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 479 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 480 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 481 BIT(IEEE80211_STYPE_AUTH >> 4) | 482 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 483 BIT(IEEE80211_STYPE_ACTION >> 4), 484 }, 485 [NL80211_IFTYPE_AP_VLAN] = { 486 /* copy AP */ 487 .tx = 0xffff, 488 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 489 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 490 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 491 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 492 BIT(IEEE80211_STYPE_AUTH >> 4) | 493 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 494 BIT(IEEE80211_STYPE_ACTION >> 4), 495 }, 496 [NL80211_IFTYPE_P2P_CLIENT] = { 497 .tx = 0xffff, 498 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 499 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 500 }, 501 [NL80211_IFTYPE_P2P_GO] = { 502 .tx = 0xffff, 503 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 504 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 505 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 506 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 507 BIT(IEEE80211_STYPE_AUTH >> 4) | 508 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 509 BIT(IEEE80211_STYPE_ACTION >> 4), 510 }, 511 [NL80211_IFTYPE_MESH_POINT] = { 512 .tx = 0xffff, 513 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 514 BIT(IEEE80211_STYPE_AUTH >> 4) | 515 BIT(IEEE80211_STYPE_DEAUTH >> 4), 516 }, 517 }; 518 519 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = { 520 .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR | 521 IEEE80211_HT_AMPDU_PARM_DENSITY, 522 523 .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 524 IEEE80211_HT_CAP_MAX_AMSDU | 525 IEEE80211_HT_CAP_SGI_40), 526 .mcs = { 527 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff, 528 0xff, 0xff, 0xff, 0xff, 0xff, }, 529 }, 530 }; 531 532 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 533 const struct ieee80211_ops *ops) 534 { 535 struct ieee80211_local *local; 536 int priv_size, i; 537 struct wiphy *wiphy; 538 539 if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove))) 540 return NULL; 541 542 /* Ensure 32-byte alignment of our private data and hw private data. 543 * We use the wiphy priv data for both our ieee80211_local and for 544 * the driver's private data 545 * 546 * In memory it'll be like this: 547 * 548 * +-------------------------+ 549 * | struct wiphy | 550 * +-------------------------+ 551 * | struct ieee80211_local | 552 * +-------------------------+ 553 * | driver's private data | 554 * +-------------------------+ 555 * 556 */ 557 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; 558 559 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 560 561 if (!wiphy) 562 return NULL; 563 564 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes; 565 566 wiphy->privid = mac80211_wiphy_privid; 567 568 wiphy->flags |= WIPHY_FLAG_NETNS_OK | 569 WIPHY_FLAG_4ADDR_AP | 570 WIPHY_FLAG_4ADDR_STATION | 571 WIPHY_FLAG_REPORTS_OBSS | 572 WIPHY_FLAG_OFFCHAN_TX; 573 574 if (ops->remain_on_channel) 575 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL; 576 577 wiphy->features = NL80211_FEATURE_SK_TX_STATUS | 578 NL80211_FEATURE_HT_IBSS; 579 580 if (!ops->set_key) 581 wiphy->flags |= WIPHY_FLAG_IBSS_RSN; 582 583 wiphy->bss_priv_size = sizeof(struct ieee80211_bss); 584 585 local = wiphy_priv(wiphy); 586 587 local->hw.wiphy = wiphy; 588 589 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 590 591 BUG_ON(!ops->tx); 592 BUG_ON(!ops->start); 593 BUG_ON(!ops->stop); 594 BUG_ON(!ops->config); 595 BUG_ON(!ops->add_interface); 596 BUG_ON(!ops->remove_interface); 597 BUG_ON(!ops->configure_filter); 598 local->ops = ops; 599 600 /* set up some defaults */ 601 local->hw.queues = 1; 602 local->hw.max_rates = 1; 603 local->hw.max_report_rates = 0; 604 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 605 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 606 local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE; 607 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 608 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 609 local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 610 IEEE80211_RADIOTAP_MCS_HAVE_GI | 611 IEEE80211_RADIOTAP_MCS_HAVE_BW; 612 local->user_power_level = -1; 613 wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask; 614 615 INIT_LIST_HEAD(&local->interfaces); 616 617 __hw_addr_init(&local->mc_list); 618 619 mutex_init(&local->iflist_mtx); 620 mutex_init(&local->mtx); 621 622 mutex_init(&local->key_mtx); 623 spin_lock_init(&local->filter_lock); 624 spin_lock_init(&local->queue_stop_reason_lock); 625 626 /* 627 * The rx_skb_queue is only accessed from tasklets, 628 * but other SKB queues are used from within IRQ 629 * context. Therefore, this one needs a different 630 * locking class so our direct, non-irq-safe use of 631 * the queue's lock doesn't throw lockdep warnings. 632 */ 633 skb_queue_head_init_class(&local->rx_skb_queue, 634 &ieee80211_rx_skb_queue_class); 635 636 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 637 638 INIT_WORK(&local->restart_work, ieee80211_restart_work); 639 640 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter); 641 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work); 642 local->smps_mode = IEEE80211_SMPS_OFF; 643 644 INIT_WORK(&local->dynamic_ps_enable_work, 645 ieee80211_dynamic_ps_enable_work); 646 INIT_WORK(&local->dynamic_ps_disable_work, 647 ieee80211_dynamic_ps_disable_work); 648 setup_timer(&local->dynamic_ps_timer, 649 ieee80211_dynamic_ps_timer, (unsigned long) local); 650 651 INIT_WORK(&local->sched_scan_stopped_work, 652 ieee80211_sched_scan_stopped_work); 653 654 spin_lock_init(&local->ack_status_lock); 655 idr_init(&local->ack_status_frames); 656 /* preallocate at least one entry */ 657 idr_pre_get(&local->ack_status_frames, GFP_KERNEL); 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_roc_setup(local); 681 682 return &local->hw; 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, i; 690 enum ieee80211_band band; 691 int channels, max_bitrates; 692 bool supp_ht, supp_vht; 693 netdev_features_t feature_whitelist; 694 static const u32 cipher_suites[] = { 695 /* keep WEP first, it may be removed below */ 696 WLAN_CIPHER_SUITE_WEP40, 697 WLAN_CIPHER_SUITE_WEP104, 698 WLAN_CIPHER_SUITE_TKIP, 699 WLAN_CIPHER_SUITE_CCMP, 700 701 /* keep last -- depends on hw flags! */ 702 WLAN_CIPHER_SUITE_AES_CMAC 703 }; 704 705 if (hw->flags & IEEE80211_HW_QUEUE_CONTROL && 706 (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE || 707 local->hw.offchannel_tx_hw_queue >= local->hw.queues)) 708 return -EINVAL; 709 710 #ifdef CONFIG_PM 711 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) && 712 (!local->ops->suspend || !local->ops->resume)) 713 return -EINVAL; 714 #endif 715 716 if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan) 717 return -EINVAL; 718 719 /* Only HW csum features are currently compatible with mac80211 */ 720 feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | 721 NETIF_F_HW_CSUM; 722 if (WARN_ON(hw->netdev_features & ~feature_whitelist)) 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 supp_vht = false; 737 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 738 struct ieee80211_supported_band *sband; 739 740 sband = local->hw.wiphy->bands[band]; 741 if (!sband) 742 continue; 743 if (!local->oper_channel) { 744 /* init channel we're on */ 745 local->hw.conf.channel = 746 local->oper_channel = &sband->channels[0]; 747 local->hw.conf.channel_type = NL80211_CHAN_NO_HT; 748 } 749 channels += sband->n_channels; 750 751 if (max_bitrates < sband->n_bitrates) 752 max_bitrates = sband->n_bitrates; 753 supp_ht = supp_ht || sband->ht_cap.ht_supported; 754 supp_vht = supp_vht || sband->vht_cap.vht_supported; 755 } 756 757 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) + 758 sizeof(void *) * channels, GFP_KERNEL); 759 if (!local->int_scan_req) 760 return -ENOMEM; 761 762 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 763 if (!local->hw.wiphy->bands[band]) 764 continue; 765 local->int_scan_req->rates[band] = (u32) -1; 766 } 767 768 /* if low-level driver supports AP, we also support VLAN */ 769 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) { 770 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 771 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN); 772 } 773 774 /* mac80211 always supports monitor */ 775 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 776 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR); 777 778 /* 779 * mac80211 doesn't support more than 1 channel, and also not more 780 * than one IBSS interface 781 */ 782 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) { 783 const struct ieee80211_iface_combination *c; 784 int j; 785 786 c = &hw->wiphy->iface_combinations[i]; 787 788 if (c->num_different_channels > 1) 789 return -EINVAL; 790 791 for (j = 0; j < c->n_limits; j++) 792 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) && 793 c->limits[j].max > 1) 794 return -EINVAL; 795 } 796 797 #ifndef CONFIG_MAC80211_MESH 798 /* mesh depends on Kconfig, but drivers should set it if they want */ 799 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT); 800 #endif 801 802 /* if the underlying driver supports mesh, mac80211 will (at least) 803 * provide routing of mesh authentication frames to userspace */ 804 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT)) 805 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH; 806 807 /* mac80211 supports control port protocol changing */ 808 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL; 809 810 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 811 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 812 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 813 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 814 815 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) 816 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK), 817 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"); 818 819 /* 820 * Calculate scan IE length -- we need this to alloc 821 * memory and to subtract from the driver limit. It 822 * includes the DS Params, (extended) supported rates, and HT 823 * information -- SSID is the driver's responsibility. 824 */ 825 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ + 826 3 /* DS Params */; 827 if (supp_ht) 828 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 829 830 if (supp_vht) 831 local->scan_ies_len += 832 2 + sizeof(struct ieee80211_vht_capabilities); 833 834 if (!local->ops->hw_scan) { 835 /* For hw_scan, driver needs to set these up. */ 836 local->hw.wiphy->max_scan_ssids = 4; 837 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 838 } 839 840 /* 841 * If the driver supports any scan IEs, then assume the 842 * limit includes the IEs mac80211 will add, otherwise 843 * leave it at zero and let the driver sort it out; we 844 * still pass our IEs to the driver but userspace will 845 * not be allowed to in that case. 846 */ 847 if (local->hw.wiphy->max_scan_ie_len) 848 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 849 850 /* Set up cipher suites unless driver already did */ 851 if (!local->hw.wiphy->cipher_suites) { 852 local->hw.wiphy->cipher_suites = cipher_suites; 853 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 854 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) 855 local->hw.wiphy->n_cipher_suites--; 856 } 857 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) { 858 if (local->hw.wiphy->cipher_suites == cipher_suites) { 859 local->hw.wiphy->cipher_suites += 2; 860 local->hw.wiphy->n_cipher_suites -= 2; 861 } else { 862 u32 *suites; 863 int r, w = 0; 864 865 /* Filter out WEP */ 866 867 suites = kmemdup( 868 local->hw.wiphy->cipher_suites, 869 sizeof(u32) * local->hw.wiphy->n_cipher_suites, 870 GFP_KERNEL); 871 if (!suites) 872 return -ENOMEM; 873 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) { 874 u32 suite = local->hw.wiphy->cipher_suites[r]; 875 if (suite == WLAN_CIPHER_SUITE_WEP40 || 876 suite == WLAN_CIPHER_SUITE_WEP104) 877 continue; 878 suites[w++] = suite; 879 } 880 local->hw.wiphy->cipher_suites = suites; 881 local->hw.wiphy->n_cipher_suites = w; 882 local->wiphy_ciphers_allocated = true; 883 } 884 } 885 886 if (!local->ops->remain_on_channel) 887 local->hw.wiphy->max_remain_on_channel_duration = 5000; 888 889 if (local->ops->sched_scan_start) 890 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN; 891 892 /* mac80211 based drivers don't support internal TDLS setup */ 893 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) 894 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP; 895 896 result = wiphy_register(local->hw.wiphy); 897 if (result < 0) 898 goto fail_wiphy_register; 899 900 /* 901 * We use the number of queues for feature tests (QoS, HT) internally 902 * so restrict them appropriately. 903 */ 904 if (hw->queues > IEEE80211_MAX_QUEUES) 905 hw->queues = IEEE80211_MAX_QUEUES; 906 907 local->workqueue = 908 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0); 909 if (!local->workqueue) { 910 result = -ENOMEM; 911 goto fail_workqueue; 912 } 913 914 /* 915 * The hardware needs headroom for sending the frame, 916 * and we need some headroom for passing the frame to monitor 917 * interfaces, but never both at the same time. 918 */ 919 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 920 IEEE80211_TX_STATUS_HEADROOM); 921 922 debugfs_hw_add(local); 923 924 /* 925 * if the driver doesn't specify a max listen interval we 926 * use 5 which should be a safe default 927 */ 928 if (local->hw.max_listen_interval == 0) 929 local->hw.max_listen_interval = 5; 930 931 local->hw.conf.listen_interval = local->hw.max_listen_interval; 932 933 local->dynamic_ps_forced_timeout = -1; 934 935 result = ieee80211_wep_init(local); 936 if (result < 0) 937 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n", 938 result); 939 940 ieee80211_led_init(local); 941 942 rtnl_lock(); 943 944 result = ieee80211_init_rate_ctrl_alg(local, 945 hw->rate_control_algorithm); 946 if (result < 0) { 947 wiphy_debug(local->hw.wiphy, 948 "Failed to initialize rate control algorithm\n"); 949 goto fail_rate; 950 } 951 952 /* add one default STA interface if supported */ 953 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 954 result = ieee80211_if_add(local, "wlan%d", NULL, 955 NL80211_IFTYPE_STATION, NULL); 956 if (result) 957 wiphy_warn(local->hw.wiphy, 958 "Failed to add default virtual iface\n"); 959 } 960 961 rtnl_unlock(); 962 963 local->network_latency_notifier.notifier_call = 964 ieee80211_max_network_latency; 965 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 966 &local->network_latency_notifier); 967 if (result) { 968 rtnl_lock(); 969 goto fail_pm_qos; 970 } 971 972 #ifdef CONFIG_INET 973 local->ifa_notifier.notifier_call = ieee80211_ifa_changed; 974 result = register_inetaddr_notifier(&local->ifa_notifier); 975 if (result) 976 goto fail_ifa; 977 #endif 978 979 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll, 980 local->hw.napi_weight); 981 982 return 0; 983 984 #ifdef CONFIG_INET 985 fail_ifa: 986 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 987 &local->network_latency_notifier); 988 rtnl_lock(); 989 #endif 990 fail_pm_qos: 991 ieee80211_led_exit(local); 992 ieee80211_remove_interfaces(local); 993 fail_rate: 994 rtnl_unlock(); 995 ieee80211_wep_free(local); 996 sta_info_stop(local); 997 destroy_workqueue(local->workqueue); 998 fail_workqueue: 999 wiphy_unregister(local->hw.wiphy); 1000 fail_wiphy_register: 1001 if (local->wiphy_ciphers_allocated) 1002 kfree(local->hw.wiphy->cipher_suites); 1003 kfree(local->int_scan_req); 1004 return result; 1005 } 1006 EXPORT_SYMBOL(ieee80211_register_hw); 1007 1008 void ieee80211_unregister_hw(struct ieee80211_hw *hw) 1009 { 1010 struct ieee80211_local *local = hw_to_local(hw); 1011 1012 tasklet_kill(&local->tx_pending_tasklet); 1013 tasklet_kill(&local->tasklet); 1014 1015 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 1016 &local->network_latency_notifier); 1017 #ifdef CONFIG_INET 1018 unregister_inetaddr_notifier(&local->ifa_notifier); 1019 #endif 1020 1021 rtnl_lock(); 1022 1023 /* 1024 * At this point, interface list manipulations are fine 1025 * because the driver cannot be handing us frames any 1026 * more and the tasklet is killed. 1027 */ 1028 ieee80211_remove_interfaces(local); 1029 1030 rtnl_unlock(); 1031 1032 cancel_work_sync(&local->restart_work); 1033 cancel_work_sync(&local->reconfig_filter); 1034 1035 ieee80211_clear_tx_pending(local); 1036 rate_control_deinitialize(local); 1037 1038 if (skb_queue_len(&local->skb_queue) || 1039 skb_queue_len(&local->skb_queue_unreliable)) 1040 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n"); 1041 skb_queue_purge(&local->skb_queue); 1042 skb_queue_purge(&local->skb_queue_unreliable); 1043 skb_queue_purge(&local->rx_skb_queue); 1044 1045 destroy_workqueue(local->workqueue); 1046 wiphy_unregister(local->hw.wiphy); 1047 sta_info_stop(local); 1048 ieee80211_wep_free(local); 1049 ieee80211_led_exit(local); 1050 kfree(local->int_scan_req); 1051 } 1052 EXPORT_SYMBOL(ieee80211_unregister_hw); 1053 1054 static int ieee80211_free_ack_frame(int id, void *p, void *data) 1055 { 1056 WARN_ONCE(1, "Have pending ack frames!\n"); 1057 kfree_skb(p); 1058 return 0; 1059 } 1060 1061 void ieee80211_free_hw(struct ieee80211_hw *hw) 1062 { 1063 struct ieee80211_local *local = hw_to_local(hw); 1064 1065 mutex_destroy(&local->iflist_mtx); 1066 mutex_destroy(&local->mtx); 1067 1068 if (local->wiphy_ciphers_allocated) 1069 kfree(local->hw.wiphy->cipher_suites); 1070 1071 idr_for_each(&local->ack_status_frames, 1072 ieee80211_free_ack_frame, NULL); 1073 idr_destroy(&local->ack_status_frames); 1074 1075 wiphy_free(local->hw.wiphy); 1076 } 1077 EXPORT_SYMBOL(ieee80211_free_hw); 1078 1079 static int __init ieee80211_init(void) 1080 { 1081 struct sk_buff *skb; 1082 int ret; 1083 1084 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1085 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1086 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1087 1088 ret = rc80211_minstrel_init(); 1089 if (ret) 1090 return ret; 1091 1092 ret = rc80211_minstrel_ht_init(); 1093 if (ret) 1094 goto err_minstrel; 1095 1096 ret = rc80211_pid_init(); 1097 if (ret) 1098 goto err_pid; 1099 1100 ret = ieee80211_iface_init(); 1101 if (ret) 1102 goto err_netdev; 1103 1104 return 0; 1105 err_netdev: 1106 rc80211_pid_exit(); 1107 err_pid: 1108 rc80211_minstrel_ht_exit(); 1109 err_minstrel: 1110 rc80211_minstrel_exit(); 1111 1112 return ret; 1113 } 1114 1115 static void __exit ieee80211_exit(void) 1116 { 1117 rc80211_pid_exit(); 1118 rc80211_minstrel_ht_exit(); 1119 rc80211_minstrel_exit(); 1120 1121 if (mesh_allocated) 1122 ieee80211s_stop(); 1123 1124 ieee80211_iface_exit(); 1125 1126 rcu_barrier(); 1127 } 1128 1129 1130 subsys_initcall(ieee80211_init); 1131 module_exit(ieee80211_exit); 1132 1133 MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1134 MODULE_LICENSE("GPL"); 1135