main.c revision a65240c1013222dbf41166c8b2c5ed2720c807c3
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#include <net/addrconf.h> 27 28#include "ieee80211_i.h" 29#include "driver-ops.h" 30#include "rate.h" 31#include "mesh.h" 32#include "wep.h" 33#include "led.h" 34#include "cfg.h" 35#include "debugfs.h" 36 37static struct lock_class_key ieee80211_rx_skb_queue_class; 38 39void ieee80211_configure_filter(struct ieee80211_local *local) 40{ 41 u64 mc; 42 unsigned int changed_flags; 43 unsigned int new_flags = 0; 44 45 if (atomic_read(&local->iff_promiscs)) 46 new_flags |= FIF_PROMISC_IN_BSS; 47 48 if (atomic_read(&local->iff_allmultis)) 49 new_flags |= FIF_ALLMULTI; 50 51 if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) || 52 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) 53 new_flags |= FIF_BCN_PRBRESP_PROMISC; 54 55 if (local->fif_probe_req || local->probe_req_reg) 56 new_flags |= FIF_PROBE_REQ; 57 58 if (local->fif_fcsfail) 59 new_flags |= FIF_FCSFAIL; 60 61 if (local->fif_plcpfail) 62 new_flags |= FIF_PLCPFAIL; 63 64 if (local->fif_control) 65 new_flags |= FIF_CONTROL; 66 67 if (local->fif_other_bss) 68 new_flags |= FIF_OTHER_BSS; 69 70 if (local->fif_pspoll) 71 new_flags |= FIF_PSPOLL; 72 73 spin_lock_bh(&local->filter_lock); 74 changed_flags = local->filter_flags ^ new_flags; 75 76 mc = drv_prepare_multicast(local, &local->mc_list); 77 spin_unlock_bh(&local->filter_lock); 78 79 /* be a bit nasty */ 80 new_flags |= (1<<31); 81 82 drv_configure_filter(local, changed_flags, &new_flags, mc); 83 84 WARN_ON(new_flags & (1<<31)); 85 86 local->filter_flags = new_flags & ~(1<<31); 87} 88 89static void ieee80211_reconfig_filter(struct work_struct *work) 90{ 91 struct ieee80211_local *local = 92 container_of(work, struct ieee80211_local, reconfig_filter); 93 94 ieee80211_configure_filter(local); 95} 96 97static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local) 98{ 99 struct ieee80211_sub_if_data *sdata; 100 struct ieee80211_channel *chan; 101 u32 changed = 0; 102 int power; 103 enum nl80211_channel_type channel_type; 104 u32 offchannel_flag; 105 bool scanning = false; 106 107 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 108 if (local->scan_channel) { 109 chan = local->scan_channel; 110 /* If scanning on oper channel, use whatever channel-type 111 * is currently in use. 112 */ 113 if (chan == local->_oper_channel) 114 channel_type = local->_oper_channel_type; 115 else 116 channel_type = NL80211_CHAN_NO_HT; 117 } else if (local->tmp_channel) { 118 chan = local->tmp_channel; 119 channel_type = NL80211_CHAN_NO_HT; 120 } else { 121 chan = local->_oper_channel; 122 channel_type = local->_oper_channel_type; 123 } 124 125 if (chan != local->_oper_channel || 126 channel_type != local->_oper_channel_type) 127 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL; 128 else 129 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL; 130 131 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 132 133 if (offchannel_flag || chan != local->hw.conf.channel || 134 channel_type != local->hw.conf.channel_type) { 135 local->hw.conf.channel = chan; 136 local->hw.conf.channel_type = channel_type; 137 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 138 } 139 140 if (!conf_is_ht(&local->hw.conf)) { 141 /* 142 * mac80211.h documents that this is only valid 143 * when the channel is set to an HT type, and 144 * that otherwise STATIC is used. 145 */ 146 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC; 147 } else if (local->hw.conf.smps_mode != local->smps_mode) { 148 local->hw.conf.smps_mode = local->smps_mode; 149 changed |= IEEE80211_CONF_CHANGE_SMPS; 150 } 151 152 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 153 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) || 154 test_bit(SCAN_HW_SCANNING, &local->scanning); 155 power = chan->max_power; 156 157 rcu_read_lock(); 158 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 159 if (!rcu_access_pointer(sdata->vif.chanctx_conf)) 160 continue; 161 power = min(power, sdata->vif.bss_conf.txpower); 162 } 163 rcu_read_unlock(); 164 165 if (local->hw.conf.power_level != power) { 166 changed |= IEEE80211_CONF_CHANGE_POWER; 167 local->hw.conf.power_level = power; 168 } 169 170 return changed; 171} 172 173int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 174{ 175 int ret = 0; 176 177 might_sleep(); 178 179 if (!local->use_chanctx) 180 changed |= ieee80211_hw_conf_chan(local); 181 else 182 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL | 183 IEEE80211_CONF_CHANGE_POWER); 184 185 if (changed && local->open_count) { 186 ret = drv_config(local, changed); 187 /* 188 * Goal: 189 * HW reconfiguration should never fail, the driver has told 190 * us what it can support so it should live up to that promise. 191 * 192 * Current status: 193 * rfkill is not integrated with mac80211 and a 194 * configuration command can thus fail if hardware rfkill 195 * is enabled 196 * 197 * FIXME: integrate rfkill with mac80211 and then add this 198 * WARN_ON() back 199 * 200 */ 201 /* WARN_ON(ret); */ 202 } 203 204 return ret; 205} 206 207void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 208 u32 changed) 209{ 210 struct ieee80211_local *local = sdata->local; 211 212 if (!changed) 213 return; 214 215 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed); 216} 217 218u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 219{ 220 sdata->vif.bss_conf.use_cts_prot = false; 221 sdata->vif.bss_conf.use_short_preamble = false; 222 sdata->vif.bss_conf.use_short_slot = false; 223 return BSS_CHANGED_ERP_CTS_PROT | 224 BSS_CHANGED_ERP_PREAMBLE | 225 BSS_CHANGED_ERP_SLOT; 226} 227 228static void ieee80211_tasklet_handler(unsigned long data) 229{ 230 struct ieee80211_local *local = (struct ieee80211_local *) data; 231 struct sta_info *sta, *tmp; 232 struct skb_eosp_msg_data *eosp_data; 233 struct sk_buff *skb; 234 235 while ((skb = skb_dequeue(&local->skb_queue)) || 236 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 237 switch (skb->pkt_type) { 238 case IEEE80211_RX_MSG: 239 /* Clear skb->pkt_type in order to not confuse kernel 240 * netstack. */ 241 skb->pkt_type = 0; 242 ieee80211_rx(&local->hw, skb); 243 break; 244 case IEEE80211_TX_STATUS_MSG: 245 skb->pkt_type = 0; 246 ieee80211_tx_status(&local->hw, skb); 247 break; 248 case IEEE80211_EOSP_MSG: 249 eosp_data = (void *)skb->cb; 250 for_each_sta_info(local, eosp_data->sta, sta, tmp) { 251 /* skip wrong virtual interface */ 252 if (memcmp(eosp_data->iface, 253 sta->sdata->vif.addr, ETH_ALEN)) 254 continue; 255 clear_sta_flag(sta, WLAN_STA_SP); 256 break; 257 } 258 dev_kfree_skb(skb); 259 break; 260 default: 261 WARN(1, "mac80211: Packet is of unknown type %d\n", 262 skb->pkt_type); 263 dev_kfree_skb(skb); 264 break; 265 } 266 } 267} 268 269static void ieee80211_restart_work(struct work_struct *work) 270{ 271 struct ieee80211_local *local = 272 container_of(work, struct ieee80211_local, restart_work); 273 274 /* wait for scan work complete */ 275 flush_workqueue(local->workqueue); 276 277 mutex_lock(&local->mtx); 278 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) || 279 rcu_dereference_protected(local->sched_scan_sdata, 280 lockdep_is_held(&local->mtx)), 281 "%s called with hardware scan in progress\n", __func__); 282 mutex_unlock(&local->mtx); 283 284 rtnl_lock(); 285 ieee80211_scan_cancel(local); 286 ieee80211_reconfig(local); 287 rtnl_unlock(); 288} 289 290void ieee80211_restart_hw(struct ieee80211_hw *hw) 291{ 292 struct ieee80211_local *local = hw_to_local(hw); 293 294 trace_api_restart_hw(local); 295 296 wiphy_info(hw->wiphy, 297 "Hardware restart was requested\n"); 298 299 /* use this reason, ieee80211_reconfig will unblock it */ 300 ieee80211_stop_queues_by_reason(hw, 301 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 302 303 /* 304 * Stop all Rx during the reconfig. We don't want state changes 305 * or driver callbacks while this is in progress. 306 */ 307 local->in_reconfig = true; 308 barrier(); 309 310 schedule_work(&local->restart_work); 311} 312EXPORT_SYMBOL(ieee80211_restart_hw); 313 314#ifdef CONFIG_INET 315static int ieee80211_ifa_changed(struct notifier_block *nb, 316 unsigned long data, void *arg) 317{ 318 struct in_ifaddr *ifa = arg; 319 struct ieee80211_local *local = 320 container_of(nb, struct ieee80211_local, 321 ifa_notifier); 322 struct net_device *ndev = ifa->ifa_dev->dev; 323 struct wireless_dev *wdev = ndev->ieee80211_ptr; 324 struct in_device *idev; 325 struct ieee80211_sub_if_data *sdata; 326 struct ieee80211_bss_conf *bss_conf; 327 struct ieee80211_if_managed *ifmgd; 328 int c = 0; 329 330 /* Make sure it's our interface that got changed */ 331 if (!wdev) 332 return NOTIFY_DONE; 333 334 if (wdev->wiphy != local->hw.wiphy) 335 return NOTIFY_DONE; 336 337 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 338 bss_conf = &sdata->vif.bss_conf; 339 340 /* ARP filtering is only supported in managed mode */ 341 if (sdata->vif.type != NL80211_IFTYPE_STATION) 342 return NOTIFY_DONE; 343 344 idev = __in_dev_get_rtnl(sdata->dev); 345 if (!idev) 346 return NOTIFY_DONE; 347 348 ifmgd = &sdata->u.mgd; 349 mutex_lock(&ifmgd->mtx); 350 351 /* Copy the addresses to the bss_conf list */ 352 ifa = idev->ifa_list; 353 while (ifa) { 354 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN) 355 bss_conf->arp_addr_list[c] = ifa->ifa_address; 356 ifa = ifa->ifa_next; 357 c++; 358 } 359 360 bss_conf->arp_addr_cnt = c; 361 362 /* Configure driver only if associated (which also implies it is up) */ 363 if (ifmgd->associated) 364 ieee80211_bss_info_change_notify(sdata, 365 BSS_CHANGED_ARP_FILTER); 366 367 mutex_unlock(&ifmgd->mtx); 368 369 return NOTIFY_DONE; 370} 371#endif 372 373#if IS_ENABLED(CONFIG_IPV6) 374static int ieee80211_ifa6_changed(struct notifier_block *nb, 375 unsigned long data, void *arg) 376{ 377 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg; 378 struct inet6_dev *idev = ifa->idev; 379 struct net_device *ndev = ifa->idev->dev; 380 struct ieee80211_local *local = 381 container_of(nb, struct ieee80211_local, ifa6_notifier); 382 struct wireless_dev *wdev = ndev->ieee80211_ptr; 383 struct ieee80211_sub_if_data *sdata; 384 385 /* Make sure it's our interface that got changed */ 386 if (!wdev || wdev->wiphy != local->hw.wiphy) 387 return NOTIFY_DONE; 388 389 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 390 391 /* 392 * For now only support station mode. This is mostly because 393 * doing AP would have to handle AP_VLAN in some way ... 394 */ 395 if (sdata->vif.type != NL80211_IFTYPE_STATION) 396 return NOTIFY_DONE; 397 398 drv_ipv6_addr_change(local, sdata, idev); 399 400 return NOTIFY_DONE; 401} 402#endif 403 404static int ieee80211_napi_poll(struct napi_struct *napi, int budget) 405{ 406 struct ieee80211_local *local = 407 container_of(napi, struct ieee80211_local, napi); 408 409 return local->ops->napi_poll(&local->hw, budget); 410} 411 412void ieee80211_napi_schedule(struct ieee80211_hw *hw) 413{ 414 struct ieee80211_local *local = hw_to_local(hw); 415 416 napi_schedule(&local->napi); 417} 418EXPORT_SYMBOL(ieee80211_napi_schedule); 419 420void ieee80211_napi_complete(struct ieee80211_hw *hw) 421{ 422 struct ieee80211_local *local = hw_to_local(hw); 423 424 napi_complete(&local->napi); 425} 426EXPORT_SYMBOL(ieee80211_napi_complete); 427 428/* There isn't a lot of sense in it, but you can transmit anything you like */ 429static const struct ieee80211_txrx_stypes 430ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = { 431 [NL80211_IFTYPE_ADHOC] = { 432 .tx = 0xffff, 433 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 434 BIT(IEEE80211_STYPE_AUTH >> 4) | 435 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 436 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 437 }, 438 [NL80211_IFTYPE_STATION] = { 439 .tx = 0xffff, 440 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 441 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 442 }, 443 [NL80211_IFTYPE_AP] = { 444 .tx = 0xffff, 445 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 446 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 447 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 448 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 449 BIT(IEEE80211_STYPE_AUTH >> 4) | 450 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 451 BIT(IEEE80211_STYPE_ACTION >> 4), 452 }, 453 [NL80211_IFTYPE_AP_VLAN] = { 454 /* copy AP */ 455 .tx = 0xffff, 456 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 457 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 458 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 459 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 460 BIT(IEEE80211_STYPE_AUTH >> 4) | 461 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 462 BIT(IEEE80211_STYPE_ACTION >> 4), 463 }, 464 [NL80211_IFTYPE_P2P_CLIENT] = { 465 .tx = 0xffff, 466 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 467 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 468 }, 469 [NL80211_IFTYPE_P2P_GO] = { 470 .tx = 0xffff, 471 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 472 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 473 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 474 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 475 BIT(IEEE80211_STYPE_AUTH >> 4) | 476 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 477 BIT(IEEE80211_STYPE_ACTION >> 4), 478 }, 479 [NL80211_IFTYPE_MESH_POINT] = { 480 .tx = 0xffff, 481 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 482 BIT(IEEE80211_STYPE_AUTH >> 4) | 483 BIT(IEEE80211_STYPE_DEAUTH >> 4), 484 }, 485 [NL80211_IFTYPE_P2P_DEVICE] = { 486 .tx = 0xffff, 487 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 488 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 489 }, 490}; 491 492static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = { 493 .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR | 494 IEEE80211_HT_AMPDU_PARM_DENSITY, 495 496 .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 497 IEEE80211_HT_CAP_MAX_AMSDU | 498 IEEE80211_HT_CAP_SGI_20 | 499 IEEE80211_HT_CAP_SGI_40), 500 .mcs = { 501 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff, 502 0xff, 0xff, 0xff, 0xff, 0xff, }, 503 }, 504}; 505 506struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 507 const struct ieee80211_ops *ops) 508{ 509 struct ieee80211_local *local; 510 int priv_size, i; 511 struct wiphy *wiphy; 512 bool use_chanctx; 513 514 if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config || 515 !ops->add_interface || !ops->remove_interface || 516 !ops->configure_filter)) 517 return NULL; 518 519 if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove))) 520 return NULL; 521 522 /* check all or no channel context operations exist */ 523 i = !!ops->add_chanctx + !!ops->remove_chanctx + 524 !!ops->change_chanctx + !!ops->assign_vif_chanctx + 525 !!ops->unassign_vif_chanctx; 526 if (WARN_ON(i != 0 && i != 5)) 527 return NULL; 528 use_chanctx = i == 5; 529 530 /* Ensure 32-byte alignment of our private data and hw private data. 531 * We use the wiphy priv data for both our ieee80211_local and for 532 * the driver's private data 533 * 534 * In memory it'll be like this: 535 * 536 * +-------------------------+ 537 * | struct wiphy | 538 * +-------------------------+ 539 * | struct ieee80211_local | 540 * +-------------------------+ 541 * | driver's private data | 542 * +-------------------------+ 543 * 544 */ 545 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; 546 547 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 548 549 if (!wiphy) 550 return NULL; 551 552 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes; 553 554 wiphy->privid = mac80211_wiphy_privid; 555 556 wiphy->flags |= WIPHY_FLAG_NETNS_OK | 557 WIPHY_FLAG_4ADDR_AP | 558 WIPHY_FLAG_4ADDR_STATION | 559 WIPHY_FLAG_REPORTS_OBSS | 560 WIPHY_FLAG_OFFCHAN_TX; 561 562 if (ops->remain_on_channel) 563 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL; 564 565 wiphy->features |= NL80211_FEATURE_SK_TX_STATUS | 566 NL80211_FEATURE_SAE | 567 NL80211_FEATURE_HT_IBSS | 568 NL80211_FEATURE_VIF_TXPOWER | 569 NL80211_FEATURE_FULL_AP_CLIENT_STATE; 570 571 if (!ops->hw_scan) 572 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN | 573 NL80211_FEATURE_AP_SCAN; 574 575 576 if (!ops->set_key) 577 wiphy->flags |= WIPHY_FLAG_IBSS_RSN; 578 579 wiphy->bss_priv_size = sizeof(struct ieee80211_bss); 580 581 local = wiphy_priv(wiphy); 582 583 local->hw.wiphy = wiphy; 584 585 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 586 587 local->ops = ops; 588 local->use_chanctx = use_chanctx; 589 590 /* set up some defaults */ 591 local->hw.queues = 1; 592 local->hw.max_rates = 1; 593 local->hw.max_report_rates = 0; 594 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 595 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 596 local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE; 597 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 598 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 599 local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 600 IEEE80211_RADIOTAP_MCS_HAVE_GI | 601 IEEE80211_RADIOTAP_MCS_HAVE_BW; 602 local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI | 603 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH; 604 local->user_power_level = IEEE80211_UNSET_POWER_LEVEL; 605 wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask; 606 607 INIT_LIST_HEAD(&local->interfaces); 608 609 __hw_addr_init(&local->mc_list); 610 611 mutex_init(&local->iflist_mtx); 612 mutex_init(&local->mtx); 613 614 mutex_init(&local->key_mtx); 615 spin_lock_init(&local->filter_lock); 616 spin_lock_init(&local->queue_stop_reason_lock); 617 618 INIT_LIST_HEAD(&local->chanctx_list); 619 mutex_init(&local->chanctx_mtx); 620 621 /* 622 * The rx_skb_queue is only accessed from tasklets, 623 * but other SKB queues are used from within IRQ 624 * context. Therefore, this one needs a different 625 * locking class so our direct, non-irq-safe use of 626 * the queue's lock doesn't throw lockdep warnings. 627 */ 628 skb_queue_head_init_class(&local->rx_skb_queue, 629 &ieee80211_rx_skb_queue_class); 630 631 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 632 633 INIT_WORK(&local->restart_work, ieee80211_restart_work); 634 635 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter); 636 local->smps_mode = IEEE80211_SMPS_OFF; 637 638 INIT_WORK(&local->dynamic_ps_enable_work, 639 ieee80211_dynamic_ps_enable_work); 640 INIT_WORK(&local->dynamic_ps_disable_work, 641 ieee80211_dynamic_ps_disable_work); 642 setup_timer(&local->dynamic_ps_timer, 643 ieee80211_dynamic_ps_timer, (unsigned long) local); 644 645 INIT_WORK(&local->sched_scan_stopped_work, 646 ieee80211_sched_scan_stopped_work); 647 648 spin_lock_init(&local->ack_status_lock); 649 idr_init(&local->ack_status_frames); 650 /* preallocate at least one entry */ 651 idr_pre_get(&local->ack_status_frames, GFP_KERNEL); 652 653 sta_info_init(local); 654 655 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 656 skb_queue_head_init(&local->pending[i]); 657 atomic_set(&local->agg_queue_stop[i], 0); 658 } 659 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 660 (unsigned long)local); 661 662 tasklet_init(&local->tasklet, 663 ieee80211_tasklet_handler, 664 (unsigned long) local); 665 666 skb_queue_head_init(&local->skb_queue); 667 skb_queue_head_init(&local->skb_queue_unreliable); 668 669 /* init dummy netdev for use w/ NAPI */ 670 init_dummy_netdev(&local->napi_dev); 671 672 ieee80211_led_names(local); 673 674 ieee80211_roc_setup(local); 675 676 return &local->hw; 677} 678EXPORT_SYMBOL(ieee80211_alloc_hw); 679 680int ieee80211_register_hw(struct ieee80211_hw *hw) 681{ 682 struct ieee80211_local *local = hw_to_local(hw); 683 int result, i; 684 enum ieee80211_band band; 685 int channels, max_bitrates; 686 bool supp_ht, supp_vht; 687 netdev_features_t feature_whitelist; 688 static const u32 cipher_suites[] = { 689 /* keep WEP first, it may be removed below */ 690 WLAN_CIPHER_SUITE_WEP40, 691 WLAN_CIPHER_SUITE_WEP104, 692 WLAN_CIPHER_SUITE_TKIP, 693 WLAN_CIPHER_SUITE_CCMP, 694 695 /* keep last -- depends on hw flags! */ 696 WLAN_CIPHER_SUITE_AES_CMAC 697 }; 698 699 if (hw->flags & IEEE80211_HW_QUEUE_CONTROL && 700 (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE || 701 local->hw.offchannel_tx_hw_queue >= local->hw.queues)) 702 return -EINVAL; 703 704#ifdef CONFIG_PM 705 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) && 706 (!local->ops->suspend || !local->ops->resume)) 707 return -EINVAL; 708#endif 709 710 if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan) 711 return -EINVAL; 712 713 if (!local->use_chanctx) { 714 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) { 715 const struct ieee80211_iface_combination *comb; 716 717 comb = &local->hw.wiphy->iface_combinations[i]; 718 719 if (comb->num_different_channels > 1) 720 return -EINVAL; 721 } 722 } else { 723 /* 724 * WDS is currently prohibited when channel contexts are used 725 * because there's no clear definition of which channel WDS 726 * type interfaces use 727 */ 728 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)) 729 return -EINVAL; 730 } 731 732 /* Only HW csum features are currently compatible with mac80211 */ 733 feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | 734 NETIF_F_HW_CSUM; 735 if (WARN_ON(hw->netdev_features & ~feature_whitelist)) 736 return -EINVAL; 737 738 if (hw->max_report_rates == 0) 739 hw->max_report_rates = hw->max_rates; 740 741 local->rx_chains = 1; 742 743 /* 744 * generic code guarantees at least one band, 745 * set this very early because much code assumes 746 * that hw.conf.channel is assigned 747 */ 748 channels = 0; 749 max_bitrates = 0; 750 supp_ht = false; 751 supp_vht = false; 752 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 753 struct ieee80211_supported_band *sband; 754 755 sband = local->hw.wiphy->bands[band]; 756 if (!sband) 757 continue; 758 if (!local->use_chanctx && !local->_oper_channel) { 759 /* init channel we're on */ 760 local->hw.conf.channel = 761 local->_oper_channel = &sband->channels[0]; 762 local->hw.conf.channel_type = NL80211_CHAN_NO_HT; 763 } 764 cfg80211_chandef_create(&local->monitor_chandef, 765 &sband->channels[0], 766 NL80211_CHAN_NO_HT); 767 channels += sband->n_channels; 768 769 if (max_bitrates < sband->n_bitrates) 770 max_bitrates = sband->n_bitrates; 771 supp_ht = supp_ht || sband->ht_cap.ht_supported; 772 supp_vht = supp_vht || sband->vht_cap.vht_supported; 773 774 if (sband->ht_cap.ht_supported) 775 local->rx_chains = 776 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs), 777 local->rx_chains); 778 779 /* TODO: consider VHT for RX chains, hopefully it's the same */ 780 } 781 782 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) + 783 sizeof(void *) * channels, GFP_KERNEL); 784 if (!local->int_scan_req) 785 return -ENOMEM; 786 787 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 788 if (!local->hw.wiphy->bands[band]) 789 continue; 790 local->int_scan_req->rates[band] = (u32) -1; 791 } 792 793 /* if low-level driver supports AP, we also support VLAN */ 794 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) { 795 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 796 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN); 797 } 798 799 /* mac80211 always supports monitor */ 800 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 801 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR); 802 803 /* mac80211 doesn't support more than one IBSS interface right now */ 804 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) { 805 const struct ieee80211_iface_combination *c; 806 int j; 807 808 c = &hw->wiphy->iface_combinations[i]; 809 810 for (j = 0; j < c->n_limits; j++) 811 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) && 812 c->limits[j].max > 1) 813 return -EINVAL; 814 } 815 816#ifndef CONFIG_MAC80211_MESH 817 /* mesh depends on Kconfig, but drivers should set it if they want */ 818 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT); 819#endif 820 821 /* if the underlying driver supports mesh, mac80211 will (at least) 822 * provide routing of mesh authentication frames to userspace */ 823 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT)) 824 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH; 825 826 /* mac80211 supports control port protocol changing */ 827 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL; 828 829 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 830 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 831 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 832 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 833 834 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) 835 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK), 836 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"); 837 838 /* 839 * Calculate scan IE length -- we need this to alloc 840 * memory and to subtract from the driver limit. It 841 * includes the DS Params, (extended) supported rates, and HT 842 * information -- SSID is the driver's responsibility. 843 */ 844 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ + 845 3 /* DS Params */; 846 if (supp_ht) 847 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 848 849 if (supp_vht) { 850 local->scan_ies_len += 851 2 + sizeof(struct ieee80211_vht_cap); 852 853 /* 854 * (for now at least), drivers wanting to use VHT must 855 * support channel contexts, as they contain all the 856 * necessary VHT information and the global hw config 857 * doesn't (yet) 858 */ 859 if (WARN_ON(!local->use_chanctx)) { 860 result = -EINVAL; 861 goto fail_wiphy_register; 862 } 863 } 864 865 if (!local->ops->hw_scan) { 866 /* For hw_scan, driver needs to set these up. */ 867 local->hw.wiphy->max_scan_ssids = 4; 868 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 869 } 870 871 /* 872 * If the driver supports any scan IEs, then assume the 873 * limit includes the IEs mac80211 will add, otherwise 874 * leave it at zero and let the driver sort it out; we 875 * still pass our IEs to the driver but userspace will 876 * not be allowed to in that case. 877 */ 878 if (local->hw.wiphy->max_scan_ie_len) 879 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 880 881 /* Set up cipher suites unless driver already did */ 882 if (!local->hw.wiphy->cipher_suites) { 883 local->hw.wiphy->cipher_suites = cipher_suites; 884 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 885 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) 886 local->hw.wiphy->n_cipher_suites--; 887 } 888 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) { 889 if (local->hw.wiphy->cipher_suites == cipher_suites) { 890 local->hw.wiphy->cipher_suites += 2; 891 local->hw.wiphy->n_cipher_suites -= 2; 892 } else { 893 u32 *suites; 894 int r, w = 0; 895 896 /* Filter out WEP */ 897 898 suites = kmemdup( 899 local->hw.wiphy->cipher_suites, 900 sizeof(u32) * local->hw.wiphy->n_cipher_suites, 901 GFP_KERNEL); 902 if (!suites) { 903 result = -ENOMEM; 904 goto fail_wiphy_register; 905 } 906 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) { 907 u32 suite = local->hw.wiphy->cipher_suites[r]; 908 if (suite == WLAN_CIPHER_SUITE_WEP40 || 909 suite == WLAN_CIPHER_SUITE_WEP104) 910 continue; 911 suites[w++] = suite; 912 } 913 local->hw.wiphy->cipher_suites = suites; 914 local->hw.wiphy->n_cipher_suites = w; 915 local->wiphy_ciphers_allocated = true; 916 } 917 } 918 919 if (!local->ops->remain_on_channel) 920 local->hw.wiphy->max_remain_on_channel_duration = 5000; 921 922 if (local->ops->sched_scan_start) 923 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN; 924 925 /* mac80211 based drivers don't support internal TDLS setup */ 926 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) 927 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP; 928 929 result = wiphy_register(local->hw.wiphy); 930 if (result < 0) 931 goto fail_wiphy_register; 932 933 /* 934 * We use the number of queues for feature tests (QoS, HT) internally 935 * so restrict them appropriately. 936 */ 937 if (hw->queues > IEEE80211_MAX_QUEUES) 938 hw->queues = IEEE80211_MAX_QUEUES; 939 940 local->workqueue = 941 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0); 942 if (!local->workqueue) { 943 result = -ENOMEM; 944 goto fail_workqueue; 945 } 946 947 /* 948 * The hardware needs headroom for sending the frame, 949 * and we need some headroom for passing the frame to monitor 950 * interfaces, but never both at the same time. 951 */ 952 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 953 IEEE80211_TX_STATUS_HEADROOM); 954 955 debugfs_hw_add(local); 956 957 /* 958 * if the driver doesn't specify a max listen interval we 959 * use 5 which should be a safe default 960 */ 961 if (local->hw.max_listen_interval == 0) 962 local->hw.max_listen_interval = 5; 963 964 local->hw.conf.listen_interval = local->hw.max_listen_interval; 965 966 local->dynamic_ps_forced_timeout = -1; 967 968 result = ieee80211_wep_init(local); 969 if (result < 0) 970 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n", 971 result); 972 973 ieee80211_led_init(local); 974 975 rtnl_lock(); 976 977 result = ieee80211_init_rate_ctrl_alg(local, 978 hw->rate_control_algorithm); 979 if (result < 0) { 980 wiphy_debug(local->hw.wiphy, 981 "Failed to initialize rate control algorithm\n"); 982 goto fail_rate; 983 } 984 985 /* add one default STA interface if supported */ 986 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 987 result = ieee80211_if_add(local, "wlan%d", NULL, 988 NL80211_IFTYPE_STATION, NULL); 989 if (result) 990 wiphy_warn(local->hw.wiphy, 991 "Failed to add default virtual iface\n"); 992 } 993 994 rtnl_unlock(); 995 996 local->network_latency_notifier.notifier_call = 997 ieee80211_max_network_latency; 998 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 999 &local->network_latency_notifier); 1000 if (result) { 1001 rtnl_lock(); 1002 goto fail_pm_qos; 1003 } 1004 1005#ifdef CONFIG_INET 1006 local->ifa_notifier.notifier_call = ieee80211_ifa_changed; 1007 result = register_inetaddr_notifier(&local->ifa_notifier); 1008 if (result) 1009 goto fail_ifa; 1010#endif 1011 1012#if IS_ENABLED(CONFIG_IPV6) 1013 local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed; 1014 result = register_inet6addr_notifier(&local->ifa6_notifier); 1015 if (result) 1016 goto fail_ifa6; 1017#endif 1018 1019 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll, 1020 local->hw.napi_weight); 1021 1022 return 0; 1023 1024#if IS_ENABLED(CONFIG_IPV6) 1025 fail_ifa6: 1026#ifdef CONFIG_INET 1027 unregister_inetaddr_notifier(&local->ifa_notifier); 1028#endif 1029#endif 1030#if defined(CONFIG_INET) || defined(CONFIG_IPV6) 1031 fail_ifa: 1032 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 1033 &local->network_latency_notifier); 1034 rtnl_lock(); 1035#endif 1036 fail_pm_qos: 1037 ieee80211_led_exit(local); 1038 ieee80211_remove_interfaces(local); 1039 fail_rate: 1040 rtnl_unlock(); 1041 ieee80211_wep_free(local); 1042 sta_info_stop(local); 1043 destroy_workqueue(local->workqueue); 1044 fail_workqueue: 1045 wiphy_unregister(local->hw.wiphy); 1046 fail_wiphy_register: 1047 if (local->wiphy_ciphers_allocated) 1048 kfree(local->hw.wiphy->cipher_suites); 1049 kfree(local->int_scan_req); 1050 return result; 1051} 1052EXPORT_SYMBOL(ieee80211_register_hw); 1053 1054void ieee80211_unregister_hw(struct ieee80211_hw *hw) 1055{ 1056 struct ieee80211_local *local = hw_to_local(hw); 1057 1058 tasklet_kill(&local->tx_pending_tasklet); 1059 tasklet_kill(&local->tasklet); 1060 1061 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 1062 &local->network_latency_notifier); 1063#ifdef CONFIG_INET 1064 unregister_inetaddr_notifier(&local->ifa_notifier); 1065#endif 1066#if IS_ENABLED(CONFIG_IPV6) 1067 unregister_inet6addr_notifier(&local->ifa6_notifier); 1068#endif 1069 1070 rtnl_lock(); 1071 1072 /* 1073 * At this point, interface list manipulations are fine 1074 * because the driver cannot be handing us frames any 1075 * more and the tasklet is killed. 1076 */ 1077 ieee80211_remove_interfaces(local); 1078 1079 rtnl_unlock(); 1080 1081 cancel_work_sync(&local->restart_work); 1082 cancel_work_sync(&local->reconfig_filter); 1083 1084 ieee80211_clear_tx_pending(local); 1085 rate_control_deinitialize(local); 1086 1087 if (skb_queue_len(&local->skb_queue) || 1088 skb_queue_len(&local->skb_queue_unreliable)) 1089 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n"); 1090 skb_queue_purge(&local->skb_queue); 1091 skb_queue_purge(&local->skb_queue_unreliable); 1092 skb_queue_purge(&local->rx_skb_queue); 1093 1094 destroy_workqueue(local->workqueue); 1095 wiphy_unregister(local->hw.wiphy); 1096 sta_info_stop(local); 1097 ieee80211_wep_free(local); 1098 ieee80211_led_exit(local); 1099 kfree(local->int_scan_req); 1100} 1101EXPORT_SYMBOL(ieee80211_unregister_hw); 1102 1103static int ieee80211_free_ack_frame(int id, void *p, void *data) 1104{ 1105 WARN_ONCE(1, "Have pending ack frames!\n"); 1106 kfree_skb(p); 1107 return 0; 1108} 1109 1110void ieee80211_free_hw(struct ieee80211_hw *hw) 1111{ 1112 struct ieee80211_local *local = hw_to_local(hw); 1113 1114 mutex_destroy(&local->iflist_mtx); 1115 mutex_destroy(&local->mtx); 1116 1117 if (local->wiphy_ciphers_allocated) 1118 kfree(local->hw.wiphy->cipher_suites); 1119 1120 idr_for_each(&local->ack_status_frames, 1121 ieee80211_free_ack_frame, NULL); 1122 idr_destroy(&local->ack_status_frames); 1123 1124 wiphy_free(local->hw.wiphy); 1125} 1126EXPORT_SYMBOL(ieee80211_free_hw); 1127 1128static int __init ieee80211_init(void) 1129{ 1130 struct sk_buff *skb; 1131 int ret; 1132 1133 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1134 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1135 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1136 1137 ret = rc80211_minstrel_init(); 1138 if (ret) 1139 return ret; 1140 1141 ret = rc80211_minstrel_ht_init(); 1142 if (ret) 1143 goto err_minstrel; 1144 1145 ret = rc80211_pid_init(); 1146 if (ret) 1147 goto err_pid; 1148 1149 ret = ieee80211_iface_init(); 1150 if (ret) 1151 goto err_netdev; 1152 1153 return 0; 1154 err_netdev: 1155 rc80211_pid_exit(); 1156 err_pid: 1157 rc80211_minstrel_ht_exit(); 1158 err_minstrel: 1159 rc80211_minstrel_exit(); 1160 1161 return ret; 1162} 1163 1164static void __exit ieee80211_exit(void) 1165{ 1166 rc80211_pid_exit(); 1167 rc80211_minstrel_ht_exit(); 1168 rc80211_minstrel_exit(); 1169 1170 if (mesh_allocated) 1171 ieee80211s_stop(); 1172 1173 ieee80211_iface_exit(); 1174 1175 rcu_barrier(); 1176} 1177 1178 1179subsys_initcall(ieee80211_init); 1180module_exit(ieee80211_exit); 1181 1182MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1183MODULE_LICENSE("GPL"); 1184