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 new_flags |= FIF_BCN_PRBRESP_PROMISC; 52 53 if (local->fif_probe_req || local->probe_req_reg) 54 new_flags |= FIF_PROBE_REQ; 55 56 if (local->fif_fcsfail) 57 new_flags |= FIF_FCSFAIL; 58 59 if (local->fif_plcpfail) 60 new_flags |= FIF_PLCPFAIL; 61 62 if (local->fif_control) 63 new_flags |= FIF_CONTROL; 64 65 if (local->fif_other_bss) 66 new_flags |= FIF_OTHER_BSS; 67 68 if (local->fif_pspoll) 69 new_flags |= FIF_PSPOLL; 70 71 spin_lock_bh(&local->filter_lock); 72 changed_flags = local->filter_flags ^ new_flags; 73 74 mc = drv_prepare_multicast(local, &local->mc_list); 75 spin_unlock_bh(&local->filter_lock); 76 77 /* be a bit nasty */ 78 new_flags |= (1<<31); 79 80 drv_configure_filter(local, changed_flags, &new_flags, mc); 81 82 WARN_ON(new_flags & (1<<31)); 83 84 local->filter_flags = new_flags & ~(1<<31); 85 } 86 87 static void ieee80211_reconfig_filter(struct work_struct *work) 88 { 89 struct ieee80211_local *local = 90 container_of(work, struct ieee80211_local, reconfig_filter); 91 92 ieee80211_configure_filter(local); 93 } 94 95 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 96 { 97 struct ieee80211_channel *chan; 98 int ret = 0; 99 int power; 100 enum nl80211_channel_type channel_type; 101 u32 offchannel_flag; 102 103 might_sleep(); 104 105 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 106 if (local->scan_channel) { 107 chan = local->scan_channel; 108 /* If scanning on oper channel, use whatever channel-type 109 * is currently in use. 110 */ 111 if (chan == local->oper_channel) 112 channel_type = local->_oper_channel_type; 113 else 114 channel_type = NL80211_CHAN_NO_HT; 115 } else if (local->tmp_channel) { 116 chan = local->tmp_channel; 117 channel_type = local->tmp_channel_type; 118 } else { 119 chan = local->oper_channel; 120 channel_type = local->_oper_channel_type; 121 } 122 123 if (chan != local->oper_channel || 124 channel_type != local->_oper_channel_type) 125 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL; 126 else 127 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL; 128 129 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 130 131 if (offchannel_flag || chan != local->hw.conf.channel || 132 channel_type != local->hw.conf.channel_type) { 133 local->hw.conf.channel = chan; 134 local->hw.conf.channel_type = channel_type; 135 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 136 } 137 138 if (!conf_is_ht(&local->hw.conf)) { 139 /* 140 * mac80211.h documents that this is only valid 141 * when the channel is set to an HT type, and 142 * that otherwise STATIC is used. 143 */ 144 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC; 145 } else if (local->hw.conf.smps_mode != local->smps_mode) { 146 local->hw.conf.smps_mode = local->smps_mode; 147 changed |= IEEE80211_CONF_CHANGE_SMPS; 148 } 149 150 if (test_bit(SCAN_SW_SCANNING, &local->scanning) || 151 test_bit(SCAN_HW_SCANNING, &local->scanning)) 152 power = chan->max_power; 153 else 154 power = local->power_constr_level ? 155 min(chan->max_power, 156 (chan->max_reg_power - local->power_constr_level)) : 157 chan->max_power; 158 159 if (local->user_power_level >= 0) 160 power = min(power, local->user_power_level); 161 162 if (local->hw.conf.power_level != power) { 163 changed |= IEEE80211_CONF_CHANGE_POWER; 164 local->hw.conf.power_level = power; 165 } 166 167 if (changed && local->open_count) { 168 ret = drv_config(local, changed); 169 /* 170 * Goal: 171 * HW reconfiguration should never fail, the driver has told 172 * us what it can support so it should live up to that promise. 173 * 174 * Current status: 175 * rfkill is not integrated with mac80211 and a 176 * configuration command can thus fail if hardware rfkill 177 * is enabled 178 * 179 * FIXME: integrate rfkill with mac80211 and then add this 180 * WARN_ON() back 181 * 182 */ 183 /* WARN_ON(ret); */ 184 } 185 186 return ret; 187 } 188 189 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 190 u32 changed) 191 { 192 struct ieee80211_local *local = sdata->local; 193 static const u8 zero[ETH_ALEN] = { 0 }; 194 195 if (!changed) 196 return; 197 198 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 199 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 200 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 201 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 202 else if (sdata->vif.type == NL80211_IFTYPE_AP) 203 sdata->vif.bss_conf.bssid = sdata->vif.addr; 204 else if (sdata->vif.type == NL80211_IFTYPE_WDS) 205 sdata->vif.bss_conf.bssid = NULL; 206 else if (ieee80211_vif_is_mesh(&sdata->vif)) { 207 sdata->vif.bss_conf.bssid = zero; 208 } else { 209 WARN_ON(1); 210 return; 211 } 212 213 switch (sdata->vif.type) { 214 case NL80211_IFTYPE_AP: 215 case NL80211_IFTYPE_ADHOC: 216 case NL80211_IFTYPE_WDS: 217 case NL80211_IFTYPE_MESH_POINT: 218 break; 219 default: 220 /* do not warn to simplify caller in scan.c */ 221 changed &= ~BSS_CHANGED_BEACON_ENABLED; 222 if (WARN_ON(changed & BSS_CHANGED_BEACON)) 223 return; 224 break; 225 } 226 227 if (changed & BSS_CHANGED_BEACON_ENABLED) { 228 if (local->quiescing || !ieee80211_sdata_running(sdata) || 229 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) { 230 sdata->vif.bss_conf.enable_beacon = false; 231 } else { 232 /* 233 * Beacon should be enabled, but AP mode must 234 * check whether there is a beacon configured. 235 */ 236 switch (sdata->vif.type) { 237 case NL80211_IFTYPE_AP: 238 sdata->vif.bss_conf.enable_beacon = 239 !!sdata->u.ap.beacon; 240 break; 241 case NL80211_IFTYPE_ADHOC: 242 sdata->vif.bss_conf.enable_beacon = 243 !!sdata->u.ibss.presp; 244 break; 245 #ifdef CONFIG_MAC80211_MESH 246 case NL80211_IFTYPE_MESH_POINT: 247 sdata->vif.bss_conf.enable_beacon = 248 !!sdata->u.mesh.mesh_id_len; 249 break; 250 #endif 251 default: 252 /* not reached */ 253 WARN_ON(1); 254 break; 255 } 256 } 257 } 258 259 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed); 260 } 261 262 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 263 { 264 sdata->vif.bss_conf.use_cts_prot = false; 265 sdata->vif.bss_conf.use_short_preamble = false; 266 sdata->vif.bss_conf.use_short_slot = false; 267 return BSS_CHANGED_ERP_CTS_PROT | 268 BSS_CHANGED_ERP_PREAMBLE | 269 BSS_CHANGED_ERP_SLOT; 270 } 271 272 static void ieee80211_tasklet_handler(unsigned long data) 273 { 274 struct ieee80211_local *local = (struct ieee80211_local *) data; 275 struct sta_info *sta, *tmp; 276 struct skb_eosp_msg_data *eosp_data; 277 struct sk_buff *skb; 278 279 while ((skb = skb_dequeue(&local->skb_queue)) || 280 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 281 switch (skb->pkt_type) { 282 case IEEE80211_RX_MSG: 283 /* Clear skb->pkt_type in order to not confuse kernel 284 * netstack. */ 285 skb->pkt_type = 0; 286 ieee80211_rx(&local->hw, skb); 287 break; 288 case IEEE80211_TX_STATUS_MSG: 289 skb->pkt_type = 0; 290 ieee80211_tx_status(&local->hw, skb); 291 break; 292 case IEEE80211_EOSP_MSG: 293 eosp_data = (void *)skb->cb; 294 for_each_sta_info(local, eosp_data->sta, sta, tmp) { 295 /* skip wrong virtual interface */ 296 if (memcmp(eosp_data->iface, 297 sta->sdata->vif.addr, ETH_ALEN)) 298 continue; 299 clear_sta_flag(sta, WLAN_STA_SP); 300 break; 301 } 302 dev_kfree_skb(skb); 303 break; 304 default: 305 WARN(1, "mac80211: Packet is of unknown type %d\n", 306 skb->pkt_type); 307 dev_kfree_skb(skb); 308 break; 309 } 310 } 311 } 312 313 static void ieee80211_restart_work(struct work_struct *work) 314 { 315 struct ieee80211_local *local = 316 container_of(work, struct ieee80211_local, restart_work); 317 318 /* wait for scan work complete */ 319 flush_workqueue(local->workqueue); 320 321 mutex_lock(&local->mtx); 322 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) || 323 local->sched_scanning, 324 "%s called with hardware scan in progress\n", __func__); 325 mutex_unlock(&local->mtx); 326 327 rtnl_lock(); 328 ieee80211_scan_cancel(local); 329 ieee80211_reconfig(local); 330 rtnl_unlock(); 331 } 332 333 void ieee80211_restart_hw(struct ieee80211_hw *hw) 334 { 335 struct ieee80211_local *local = hw_to_local(hw); 336 337 trace_api_restart_hw(local); 338 339 wiphy_info(hw->wiphy, 340 "Hardware restart was requested\n"); 341 342 /* use this reason, ieee80211_reconfig will unblock it */ 343 ieee80211_stop_queues_by_reason(hw, 344 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 345 346 schedule_work(&local->restart_work); 347 } 348 EXPORT_SYMBOL(ieee80211_restart_hw); 349 350 static void ieee80211_recalc_smps_work(struct work_struct *work) 351 { 352 struct ieee80211_local *local = 353 container_of(work, struct ieee80211_local, recalc_smps); 354 355 mutex_lock(&local->iflist_mtx); 356 ieee80211_recalc_smps(local); 357 mutex_unlock(&local->iflist_mtx); 358 } 359 360 #ifdef CONFIG_INET 361 static int ieee80211_ifa_changed(struct notifier_block *nb, 362 unsigned long data, void *arg) 363 { 364 struct in_ifaddr *ifa = arg; 365 struct ieee80211_local *local = 366 container_of(nb, struct ieee80211_local, 367 ifa_notifier); 368 struct net_device *ndev = ifa->ifa_dev->dev; 369 struct wireless_dev *wdev = ndev->ieee80211_ptr; 370 struct in_device *idev; 371 struct ieee80211_sub_if_data *sdata; 372 struct ieee80211_bss_conf *bss_conf; 373 struct ieee80211_if_managed *ifmgd; 374 int c = 0; 375 376 /* Make sure it's our interface that got changed */ 377 if (!wdev) 378 return NOTIFY_DONE; 379 380 if (wdev->wiphy != local->hw.wiphy) 381 return NOTIFY_DONE; 382 383 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 384 bss_conf = &sdata->vif.bss_conf; 385 386 /* ARP filtering is only supported in managed mode */ 387 if (sdata->vif.type != NL80211_IFTYPE_STATION) 388 return NOTIFY_DONE; 389 390 idev = __in_dev_get_rtnl(sdata->dev); 391 if (!idev) 392 return NOTIFY_DONE; 393 394 ifmgd = &sdata->u.mgd; 395 mutex_lock(&ifmgd->mtx); 396 397 /* Copy the addresses to the bss_conf list */ 398 ifa = idev->ifa_list; 399 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) { 400 bss_conf->arp_addr_list[c] = ifa->ifa_address; 401 ifa = ifa->ifa_next; 402 c++; 403 } 404 405 /* If not all addresses fit the list, disable filtering */ 406 if (ifa) { 407 sdata->arp_filter_state = false; 408 c = 0; 409 } else { 410 sdata->arp_filter_state = true; 411 } 412 bss_conf->arp_addr_cnt = c; 413 414 /* Configure driver only if associated (which also implies it is up) */ 415 if (ifmgd->associated) { 416 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 417 ieee80211_bss_info_change_notify(sdata, 418 BSS_CHANGED_ARP_FILTER); 419 } 420 421 mutex_unlock(&ifmgd->mtx); 422 423 return NOTIFY_DONE; 424 } 425 #endif 426 427 static int ieee80211_napi_poll(struct napi_struct *napi, int budget) 428 { 429 struct ieee80211_local *local = 430 container_of(napi, struct ieee80211_local, napi); 431 432 return local->ops->napi_poll(&local->hw, budget); 433 } 434 435 void ieee80211_napi_schedule(struct ieee80211_hw *hw) 436 { 437 struct ieee80211_local *local = hw_to_local(hw); 438 439 napi_schedule(&local->napi); 440 } 441 EXPORT_SYMBOL(ieee80211_napi_schedule); 442 443 void ieee80211_napi_complete(struct ieee80211_hw *hw) 444 { 445 struct ieee80211_local *local = hw_to_local(hw); 446 447 napi_complete(&local->napi); 448 } 449 EXPORT_SYMBOL(ieee80211_napi_complete); 450 451 /* There isn't a lot of sense in it, but you can transmit anything you like */ 452 static const struct ieee80211_txrx_stypes 453 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = { 454 [NL80211_IFTYPE_ADHOC] = { 455 .tx = 0xffff, 456 .rx = BIT(IEEE80211_STYPE_ACTION >> 4), 457 }, 458 [NL80211_IFTYPE_STATION] = { 459 .tx = 0xffff, 460 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 461 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 462 }, 463 [NL80211_IFTYPE_AP] = { 464 .tx = 0xffff, 465 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 466 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 467 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 468 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 469 BIT(IEEE80211_STYPE_AUTH >> 4) | 470 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 471 BIT(IEEE80211_STYPE_ACTION >> 4), 472 }, 473 [NL80211_IFTYPE_AP_VLAN] = { 474 /* copy AP */ 475 .tx = 0xffff, 476 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 477 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 478 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 479 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 480 BIT(IEEE80211_STYPE_AUTH >> 4) | 481 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 482 BIT(IEEE80211_STYPE_ACTION >> 4), 483 }, 484 [NL80211_IFTYPE_P2P_CLIENT] = { 485 .tx = 0xffff, 486 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 487 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 488 }, 489 [NL80211_IFTYPE_P2P_GO] = { 490 .tx = 0xffff, 491 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 492 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 493 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 494 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 495 BIT(IEEE80211_STYPE_AUTH >> 4) | 496 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 497 BIT(IEEE80211_STYPE_ACTION >> 4), 498 }, 499 [NL80211_IFTYPE_MESH_POINT] = { 500 .tx = 0xffff, 501 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 502 BIT(IEEE80211_STYPE_AUTH >> 4) | 503 BIT(IEEE80211_STYPE_DEAUTH >> 4), 504 }, 505 }; 506 507 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = { 508 .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR | 509 IEEE80211_HT_AMPDU_PARM_DENSITY, 510 511 .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 512 IEEE80211_HT_CAP_MAX_AMSDU | 513 IEEE80211_HT_CAP_SGI_40), 514 .mcs = { 515 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff, 516 0xff, 0xff, 0xff, 0xff, 0xff, }, 517 }, 518 }; 519 520 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 521 const struct ieee80211_ops *ops) 522 { 523 struct ieee80211_local *local; 524 int priv_size, i; 525 struct wiphy *wiphy; 526 527 if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove))) 528 return NULL; 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 WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL; 562 563 wiphy->features = NL80211_FEATURE_SK_TX_STATUS | 564 NL80211_FEATURE_HT_IBSS; 565 566 if (!ops->set_key) 567 wiphy->flags |= WIPHY_FLAG_IBSS_RSN; 568 569 wiphy->bss_priv_size = sizeof(struct ieee80211_bss); 570 571 local = wiphy_priv(wiphy); 572 573 local->hw.wiphy = wiphy; 574 575 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 576 577 BUG_ON(!ops->tx && !ops->tx_frags); 578 BUG_ON(!ops->start); 579 BUG_ON(!ops->stop); 580 BUG_ON(!ops->config); 581 BUG_ON(!ops->add_interface); 582 BUG_ON(!ops->remove_interface); 583 BUG_ON(!ops->configure_filter); 584 local->ops = ops; 585 586 /* set up some defaults */ 587 local->hw.queues = 1; 588 local->hw.max_rates = 1; 589 local->hw.max_report_rates = 0; 590 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 591 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 592 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 593 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 594 local->user_power_level = -1; 595 wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask; 596 597 INIT_LIST_HEAD(&local->interfaces); 598 599 __hw_addr_init(&local->mc_list); 600 601 mutex_init(&local->iflist_mtx); 602 mutex_init(&local->mtx); 603 604 mutex_init(&local->key_mtx); 605 spin_lock_init(&local->filter_lock); 606 spin_lock_init(&local->queue_stop_reason_lock); 607 608 /* 609 * The rx_skb_queue is only accessed from tasklets, 610 * but other SKB queues are used from within IRQ 611 * context. Therefore, this one needs a different 612 * locking class so our direct, non-irq-safe use of 613 * the queue's lock doesn't throw lockdep warnings. 614 */ 615 skb_queue_head_init_class(&local->rx_skb_queue, 616 &ieee80211_rx_skb_queue_class); 617 618 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 619 620 ieee80211_work_init(local); 621 622 INIT_WORK(&local->restart_work, ieee80211_restart_work); 623 624 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter); 625 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work); 626 local->smps_mode = IEEE80211_SMPS_OFF; 627 628 INIT_WORK(&local->dynamic_ps_enable_work, 629 ieee80211_dynamic_ps_enable_work); 630 INIT_WORK(&local->dynamic_ps_disable_work, 631 ieee80211_dynamic_ps_disable_work); 632 setup_timer(&local->dynamic_ps_timer, 633 ieee80211_dynamic_ps_timer, (unsigned long) local); 634 635 INIT_WORK(&local->sched_scan_stopped_work, 636 ieee80211_sched_scan_stopped_work); 637 638 spin_lock_init(&local->ack_status_lock); 639 idr_init(&local->ack_status_frames); 640 /* preallocate at least one entry */ 641 idr_pre_get(&local->ack_status_frames, GFP_KERNEL); 642 643 sta_info_init(local); 644 645 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 646 skb_queue_head_init(&local->pending[i]); 647 atomic_set(&local->agg_queue_stop[i], 0); 648 } 649 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 650 (unsigned long)local); 651 652 tasklet_init(&local->tasklet, 653 ieee80211_tasklet_handler, 654 (unsigned long) local); 655 656 skb_queue_head_init(&local->skb_queue); 657 skb_queue_head_init(&local->skb_queue_unreliable); 658 659 /* init dummy netdev for use w/ NAPI */ 660 init_dummy_netdev(&local->napi_dev); 661 662 ieee80211_led_names(local); 663 664 ieee80211_hw_roc_setup(local); 665 666 return &local->hw; 667 } 668 EXPORT_SYMBOL(ieee80211_alloc_hw); 669 670 int ieee80211_register_hw(struct ieee80211_hw *hw) 671 { 672 struct ieee80211_local *local = hw_to_local(hw); 673 int result, i; 674 enum ieee80211_band band; 675 int channels, max_bitrates; 676 bool supp_ht; 677 static const u32 cipher_suites[] = { 678 /* keep WEP first, it may be removed below */ 679 WLAN_CIPHER_SUITE_WEP40, 680 WLAN_CIPHER_SUITE_WEP104, 681 WLAN_CIPHER_SUITE_TKIP, 682 WLAN_CIPHER_SUITE_CCMP, 683 684 /* keep last -- depends on hw flags! */ 685 WLAN_CIPHER_SUITE_AES_CMAC 686 }; 687 688 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) 689 #ifdef CONFIG_PM 690 && (!local->ops->suspend || !local->ops->resume) 691 #endif 692 ) 693 return -EINVAL; 694 695 if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan) 696 return -EINVAL; 697 698 if (hw->max_report_rates == 0) 699 hw->max_report_rates = hw->max_rates; 700 701 /* 702 * generic code guarantees at least one band, 703 * set this very early because much code assumes 704 * that hw.conf.channel is assigned 705 */ 706 channels = 0; 707 max_bitrates = 0; 708 supp_ht = false; 709 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 710 struct ieee80211_supported_band *sband; 711 712 sband = local->hw.wiphy->bands[band]; 713 if (!sband) 714 continue; 715 if (!local->oper_channel) { 716 /* init channel we're on */ 717 local->hw.conf.channel = 718 local->oper_channel = &sband->channels[0]; 719 local->hw.conf.channel_type = NL80211_CHAN_NO_HT; 720 } 721 channels += sband->n_channels; 722 723 if (max_bitrates < sband->n_bitrates) 724 max_bitrates = sband->n_bitrates; 725 supp_ht = supp_ht || sband->ht_cap.ht_supported; 726 } 727 728 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) + 729 sizeof(void *) * channels, GFP_KERNEL); 730 if (!local->int_scan_req) 731 return -ENOMEM; 732 733 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 734 if (!local->hw.wiphy->bands[band]) 735 continue; 736 local->int_scan_req->rates[band] = (u32) -1; 737 } 738 739 /* if low-level driver supports AP, we also support VLAN */ 740 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) { 741 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 742 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN); 743 } 744 745 /* mac80211 always supports monitor */ 746 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 747 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR); 748 749 /* 750 * mac80211 doesn't support more than 1 channel, and also not more 751 * than one IBSS interface 752 */ 753 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) { 754 const struct ieee80211_iface_combination *c; 755 int j; 756 757 c = &hw->wiphy->iface_combinations[i]; 758 759 if (c->num_different_channels > 1) 760 return -EINVAL; 761 762 for (j = 0; j < c->n_limits; j++) 763 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) && 764 c->limits[j].max > 1) 765 return -EINVAL; 766 } 767 768 #ifndef CONFIG_MAC80211_MESH 769 /* mesh depends on Kconfig, but drivers should set it if they want */ 770 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT); 771 #endif 772 773 /* if the underlying driver supports mesh, mac80211 will (at least) 774 * provide routing of mesh authentication frames to userspace */ 775 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT)) 776 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH; 777 778 /* mac80211 supports control port protocol changing */ 779 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL; 780 781 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 782 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 783 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 784 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 785 786 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) 787 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK), 788 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"); 789 790 /* 791 * Calculate scan IE length -- we need this to alloc 792 * memory and to subtract from the driver limit. It 793 * includes the DS Params, (extended) supported rates, and HT 794 * information -- SSID is the driver's responsibility. 795 */ 796 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ + 797 3 /* DS Params */; 798 if (supp_ht) 799 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 800 801 if (!local->ops->hw_scan) { 802 /* For hw_scan, driver needs to set these up. */ 803 local->hw.wiphy->max_scan_ssids = 4; 804 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 805 } 806 807 /* 808 * If the driver supports any scan IEs, then assume the 809 * limit includes the IEs mac80211 will add, otherwise 810 * leave it at zero and let the driver sort it out; we 811 * still pass our IEs to the driver but userspace will 812 * not be allowed to in that case. 813 */ 814 if (local->hw.wiphy->max_scan_ie_len) 815 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 816 817 /* Set up cipher suites unless driver already did */ 818 if (!local->hw.wiphy->cipher_suites) { 819 local->hw.wiphy->cipher_suites = cipher_suites; 820 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 821 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) 822 local->hw.wiphy->n_cipher_suites--; 823 } 824 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) { 825 if (local->hw.wiphy->cipher_suites == cipher_suites) { 826 local->hw.wiphy->cipher_suites += 2; 827 local->hw.wiphy->n_cipher_suites -= 2; 828 } else { 829 u32 *suites; 830 int r, w = 0; 831 832 /* Filter out WEP */ 833 834 suites = kmemdup( 835 local->hw.wiphy->cipher_suites, 836 sizeof(u32) * local->hw.wiphy->n_cipher_suites, 837 GFP_KERNEL); 838 if (!suites) 839 return -ENOMEM; 840 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) { 841 u32 suite = local->hw.wiphy->cipher_suites[r]; 842 if (suite == WLAN_CIPHER_SUITE_WEP40 || 843 suite == WLAN_CIPHER_SUITE_WEP104) 844 continue; 845 suites[w++] = suite; 846 } 847 local->hw.wiphy->cipher_suites = suites; 848 local->hw.wiphy->n_cipher_suites = w; 849 local->wiphy_ciphers_allocated = true; 850 } 851 } 852 853 if (!local->ops->remain_on_channel) 854 local->hw.wiphy->max_remain_on_channel_duration = 5000; 855 856 if (local->ops->sched_scan_start) 857 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN; 858 859 /* mac80211 based drivers don't support internal TDLS setup */ 860 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) 861 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP; 862 863 result = wiphy_register(local->hw.wiphy); 864 if (result < 0) 865 goto fail_wiphy_register; 866 867 /* 868 * We use the number of queues for feature tests (QoS, HT) internally 869 * so restrict them appropriately. 870 */ 871 if (hw->queues > IEEE80211_MAX_QUEUES) 872 hw->queues = IEEE80211_MAX_QUEUES; 873 874 local->workqueue = 875 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0); 876 if (!local->workqueue) { 877 result = -ENOMEM; 878 goto fail_workqueue; 879 } 880 881 /* 882 * The hardware needs headroom for sending the frame, 883 * and we need some headroom for passing the frame to monitor 884 * interfaces, but never both at the same time. 885 */ 886 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 887 IEEE80211_TX_STATUS_HEADROOM); 888 889 debugfs_hw_add(local); 890 891 /* 892 * if the driver doesn't specify a max listen interval we 893 * use 5 which should be a safe default 894 */ 895 if (local->hw.max_listen_interval == 0) 896 local->hw.max_listen_interval = 5; 897 898 local->hw.conf.listen_interval = local->hw.max_listen_interval; 899 900 local->dynamic_ps_forced_timeout = -1; 901 902 result = ieee80211_wep_init(local); 903 if (result < 0) 904 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n", 905 result); 906 907 ieee80211_led_init(local); 908 909 rtnl_lock(); 910 911 result = ieee80211_init_rate_ctrl_alg(local, 912 hw->rate_control_algorithm); 913 if (result < 0) { 914 wiphy_debug(local->hw.wiphy, 915 "Failed to initialize rate control algorithm\n"); 916 goto fail_rate; 917 } 918 919 /* add one default STA interface if supported */ 920 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 921 result = ieee80211_if_add(local, "wlan%d", NULL, 922 NL80211_IFTYPE_STATION, NULL); 923 if (result) 924 wiphy_warn(local->hw.wiphy, 925 "Failed to add default virtual iface\n"); 926 } 927 928 rtnl_unlock(); 929 930 local->network_latency_notifier.notifier_call = 931 ieee80211_max_network_latency; 932 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 933 &local->network_latency_notifier); 934 if (result) { 935 rtnl_lock(); 936 goto fail_pm_qos; 937 } 938 939 #ifdef CONFIG_INET 940 local->ifa_notifier.notifier_call = ieee80211_ifa_changed; 941 result = register_inetaddr_notifier(&local->ifa_notifier); 942 if (result) 943 goto fail_ifa; 944 #endif 945 946 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll, 947 local->hw.napi_weight); 948 949 return 0; 950 951 #ifdef CONFIG_INET 952 fail_ifa: 953 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 954 &local->network_latency_notifier); 955 rtnl_lock(); 956 #endif 957 fail_pm_qos: 958 ieee80211_led_exit(local); 959 ieee80211_remove_interfaces(local); 960 fail_rate: 961 rtnl_unlock(); 962 ieee80211_wep_free(local); 963 sta_info_stop(local); 964 destroy_workqueue(local->workqueue); 965 fail_workqueue: 966 wiphy_unregister(local->hw.wiphy); 967 fail_wiphy_register: 968 if (local->wiphy_ciphers_allocated) 969 kfree(local->hw.wiphy->cipher_suites); 970 kfree(local->int_scan_req); 971 return result; 972 } 973 EXPORT_SYMBOL(ieee80211_register_hw); 974 975 void ieee80211_unregister_hw(struct ieee80211_hw *hw) 976 { 977 struct ieee80211_local *local = hw_to_local(hw); 978 979 tasklet_kill(&local->tx_pending_tasklet); 980 tasklet_kill(&local->tasklet); 981 982 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 983 &local->network_latency_notifier); 984 #ifdef CONFIG_INET 985 unregister_inetaddr_notifier(&local->ifa_notifier); 986 #endif 987 988 rtnl_lock(); 989 990 /* 991 * At this point, interface list manipulations are fine 992 * because the driver cannot be handing us frames any 993 * more and the tasklet is killed. 994 */ 995 ieee80211_remove_interfaces(local); 996 997 rtnl_unlock(); 998 999 /* 1000 * Now all work items will be gone, but the 1001 * timer might still be armed, so delete it 1002 */ 1003 del_timer_sync(&local->work_timer); 1004 1005 cancel_work_sync(&local->restart_work); 1006 cancel_work_sync(&local->reconfig_filter); 1007 1008 ieee80211_clear_tx_pending(local); 1009 rate_control_deinitialize(local); 1010 1011 if (skb_queue_len(&local->skb_queue) || 1012 skb_queue_len(&local->skb_queue_unreliable)) 1013 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n"); 1014 skb_queue_purge(&local->skb_queue); 1015 skb_queue_purge(&local->skb_queue_unreliable); 1016 skb_queue_purge(&local->rx_skb_queue); 1017 1018 destroy_workqueue(local->workqueue); 1019 wiphy_unregister(local->hw.wiphy); 1020 sta_info_stop(local); 1021 ieee80211_wep_free(local); 1022 ieee80211_led_exit(local); 1023 kfree(local->int_scan_req); 1024 } 1025 EXPORT_SYMBOL(ieee80211_unregister_hw); 1026 1027 static int ieee80211_free_ack_frame(int id, void *p, void *data) 1028 { 1029 WARN_ONCE(1, "Have pending ack frames!\n"); 1030 kfree_skb(p); 1031 return 0; 1032 } 1033 1034 void ieee80211_free_hw(struct ieee80211_hw *hw) 1035 { 1036 struct ieee80211_local *local = hw_to_local(hw); 1037 1038 mutex_destroy(&local->iflist_mtx); 1039 mutex_destroy(&local->mtx); 1040 1041 if (local->wiphy_ciphers_allocated) 1042 kfree(local->hw.wiphy->cipher_suites); 1043 1044 idr_for_each(&local->ack_status_frames, 1045 ieee80211_free_ack_frame, NULL); 1046 idr_destroy(&local->ack_status_frames); 1047 1048 wiphy_free(local->hw.wiphy); 1049 } 1050 EXPORT_SYMBOL(ieee80211_free_hw); 1051 1052 static int __init ieee80211_init(void) 1053 { 1054 struct sk_buff *skb; 1055 int ret; 1056 1057 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1058 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1059 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1060 1061 ret = rc80211_minstrel_init(); 1062 if (ret) 1063 return ret; 1064 1065 ret = rc80211_minstrel_ht_init(); 1066 if (ret) 1067 goto err_minstrel; 1068 1069 ret = rc80211_pid_init(); 1070 if (ret) 1071 goto err_pid; 1072 1073 ret = ieee80211_iface_init(); 1074 if (ret) 1075 goto err_netdev; 1076 1077 return 0; 1078 err_netdev: 1079 rc80211_pid_exit(); 1080 err_pid: 1081 rc80211_minstrel_ht_exit(); 1082 err_minstrel: 1083 rc80211_minstrel_exit(); 1084 1085 return ret; 1086 } 1087 1088 static void __exit ieee80211_exit(void) 1089 { 1090 rc80211_pid_exit(); 1091 rc80211_minstrel_ht_exit(); 1092 rc80211_minstrel_exit(); 1093 1094 if (mesh_allocated) 1095 ieee80211s_stop(); 1096 1097 ieee80211_iface_exit(); 1098 1099 rcu_barrier(); 1100 } 1101 1102 1103 subsys_initcall(ieee80211_init); 1104 module_exit(ieee80211_exit); 1105 1106 MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1107 MODULE_LICENSE("GPL"); 1108