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 /* If this off-channel logic ever changes, ieee80211_on_oper_channel 106 * may need to change as well. 107 */ 108 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 109 if (local->scan_channel) { 110 chan = local->scan_channel; 111 /* If scanning on oper channel, use whatever channel-type 112 * is currently in use. 113 */ 114 if (chan == local->oper_channel) 115 channel_type = local->_oper_channel_type; 116 else 117 channel_type = NL80211_CHAN_NO_HT; 118 } else if (local->tmp_channel) { 119 chan = local->tmp_channel; 120 channel_type = local->tmp_channel_type; 121 } else { 122 chan = local->oper_channel; 123 channel_type = local->_oper_channel_type; 124 } 125 126 if (chan != local->oper_channel || 127 channel_type != local->_oper_channel_type) 128 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL; 129 else 130 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL; 131 132 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 133 134 if (offchannel_flag || chan != local->hw.conf.channel || 135 channel_type != local->hw.conf.channel_type) { 136 local->hw.conf.channel = chan; 137 local->hw.conf.channel_type = channel_type; 138 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 139 } 140 141 if (!conf_is_ht(&local->hw.conf)) { 142 /* 143 * mac80211.h documents that this is only valid 144 * when the channel is set to an HT type, and 145 * that otherwise STATIC is used. 146 */ 147 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC; 148 } else if (local->hw.conf.smps_mode != local->smps_mode) { 149 local->hw.conf.smps_mode = local->smps_mode; 150 changed |= IEEE80211_CONF_CHANGE_SMPS; 151 } 152 153 if (test_bit(SCAN_SW_SCANNING, &local->scanning) || 154 test_bit(SCAN_HW_SCANNING, &local->scanning)) 155 power = chan->max_power; 156 else 157 power = local->power_constr_level ? 158 min(chan->max_power, 159 (chan->max_reg_power - local->power_constr_level)) : 160 chan->max_power; 161 162 if (local->user_power_level >= 0) 163 power = min(power, local->user_power_level); 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 if (changed && local->open_count) { 171 ret = drv_config(local, changed); 172 /* 173 * Goal: 174 * HW reconfiguration should never fail, the driver has told 175 * us what it can support so it should live up to that promise. 176 * 177 * Current status: 178 * rfkill is not integrated with mac80211 and a 179 * configuration command can thus fail if hardware rfkill 180 * is enabled 181 * 182 * FIXME: integrate rfkill with mac80211 and then add this 183 * WARN_ON() back 184 * 185 */ 186 /* WARN_ON(ret); */ 187 } 188 189 return ret; 190 } 191 192 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 193 u32 changed) 194 { 195 struct ieee80211_local *local = sdata->local; 196 static const u8 zero[ETH_ALEN] = { 0 }; 197 198 if (!changed) 199 return; 200 201 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 202 /* 203 * While not associated, claim a BSSID of all-zeroes 204 * so that drivers don't do any weird things with the 205 * BSSID at that time. 206 */ 207 if (sdata->vif.bss_conf.assoc) 208 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 209 else 210 sdata->vif.bss_conf.bssid = zero; 211 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 212 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 213 else if (sdata->vif.type == NL80211_IFTYPE_AP) 214 sdata->vif.bss_conf.bssid = sdata->vif.addr; 215 else if (sdata->vif.type == NL80211_IFTYPE_WDS) 216 sdata->vif.bss_conf.bssid = NULL; 217 else if (ieee80211_vif_is_mesh(&sdata->vif)) { 218 sdata->vif.bss_conf.bssid = zero; 219 } else { 220 WARN_ON(1); 221 return; 222 } 223 224 switch (sdata->vif.type) { 225 case NL80211_IFTYPE_AP: 226 case NL80211_IFTYPE_ADHOC: 227 case NL80211_IFTYPE_WDS: 228 case NL80211_IFTYPE_MESH_POINT: 229 break; 230 default: 231 /* do not warn to simplify caller in scan.c */ 232 changed &= ~BSS_CHANGED_BEACON_ENABLED; 233 if (WARN_ON(changed & BSS_CHANGED_BEACON)) 234 return; 235 break; 236 } 237 238 if (changed & BSS_CHANGED_BEACON_ENABLED) { 239 if (local->quiescing || !ieee80211_sdata_running(sdata) || 240 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) { 241 sdata->vif.bss_conf.enable_beacon = false; 242 } else { 243 /* 244 * Beacon should be enabled, but AP mode must 245 * check whether there is a beacon configured. 246 */ 247 switch (sdata->vif.type) { 248 case NL80211_IFTYPE_AP: 249 sdata->vif.bss_conf.enable_beacon = 250 !!sdata->u.ap.beacon; 251 break; 252 case NL80211_IFTYPE_ADHOC: 253 sdata->vif.bss_conf.enable_beacon = 254 !!sdata->u.ibss.presp; 255 break; 256 #ifdef CONFIG_MAC80211_MESH 257 case NL80211_IFTYPE_MESH_POINT: 258 sdata->vif.bss_conf.enable_beacon = 259 !!sdata->u.mesh.mesh_id_len; 260 break; 261 #endif 262 default: 263 /* not reached */ 264 WARN_ON(1); 265 break; 266 } 267 } 268 } 269 270 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed); 271 } 272 273 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 274 { 275 sdata->vif.bss_conf.use_cts_prot = false; 276 sdata->vif.bss_conf.use_short_preamble = false; 277 sdata->vif.bss_conf.use_short_slot = false; 278 return BSS_CHANGED_ERP_CTS_PROT | 279 BSS_CHANGED_ERP_PREAMBLE | 280 BSS_CHANGED_ERP_SLOT; 281 } 282 283 static void ieee80211_tasklet_handler(unsigned long data) 284 { 285 struct ieee80211_local *local = (struct ieee80211_local *) data; 286 struct sta_info *sta, *tmp; 287 struct skb_eosp_msg_data *eosp_data; 288 struct sk_buff *skb; 289 290 while ((skb = skb_dequeue(&local->skb_queue)) || 291 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 292 switch (skb->pkt_type) { 293 case IEEE80211_RX_MSG: 294 /* Clear skb->pkt_type in order to not confuse kernel 295 * netstack. */ 296 skb->pkt_type = 0; 297 ieee80211_rx(local_to_hw(local), skb); 298 break; 299 case IEEE80211_TX_STATUS_MSG: 300 skb->pkt_type = 0; 301 ieee80211_tx_status(local_to_hw(local), skb); 302 break; 303 case IEEE80211_EOSP_MSG: 304 eosp_data = (void *)skb->cb; 305 for_each_sta_info(local, eosp_data->sta, sta, tmp) { 306 /* skip wrong virtual interface */ 307 if (memcmp(eosp_data->iface, 308 sta->sdata->vif.addr, ETH_ALEN)) 309 continue; 310 clear_sta_flag(sta, WLAN_STA_SP); 311 break; 312 } 313 dev_kfree_skb(skb); 314 break; 315 default: 316 WARN(1, "mac80211: Packet is of unknown type %d\n", 317 skb->pkt_type); 318 dev_kfree_skb(skb); 319 break; 320 } 321 } 322 } 323 324 static void ieee80211_restart_work(struct work_struct *work) 325 { 326 struct ieee80211_local *local = 327 container_of(work, struct ieee80211_local, restart_work); 328 329 /* wait for scan work complete */ 330 flush_workqueue(local->workqueue); 331 332 mutex_lock(&local->mtx); 333 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) || 334 local->sched_scanning, 335 "%s called with hardware scan in progress\n", __func__); 336 mutex_unlock(&local->mtx); 337 338 rtnl_lock(); 339 ieee80211_scan_cancel(local); 340 ieee80211_reconfig(local); 341 rtnl_unlock(); 342 } 343 344 void ieee80211_restart_hw(struct ieee80211_hw *hw) 345 { 346 struct ieee80211_local *local = hw_to_local(hw); 347 348 trace_api_restart_hw(local); 349 350 wiphy_info(hw->wiphy, 351 "Hardware restart was requested\n"); 352 353 /* use this reason, ieee80211_reconfig will unblock it */ 354 ieee80211_stop_queues_by_reason(hw, 355 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 356 357 schedule_work(&local->restart_work); 358 } 359 EXPORT_SYMBOL(ieee80211_restart_hw); 360 361 static void ieee80211_recalc_smps_work(struct work_struct *work) 362 { 363 struct ieee80211_local *local = 364 container_of(work, struct ieee80211_local, recalc_smps); 365 366 mutex_lock(&local->iflist_mtx); 367 ieee80211_recalc_smps(local); 368 mutex_unlock(&local->iflist_mtx); 369 } 370 371 #ifdef CONFIG_INET 372 static int ieee80211_ifa_changed(struct notifier_block *nb, 373 unsigned long data, void *arg) 374 { 375 struct in_ifaddr *ifa = arg; 376 struct ieee80211_local *local = 377 container_of(nb, struct ieee80211_local, 378 ifa_notifier); 379 struct net_device *ndev = ifa->ifa_dev->dev; 380 struct wireless_dev *wdev = ndev->ieee80211_ptr; 381 struct in_device *idev; 382 struct ieee80211_sub_if_data *sdata; 383 struct ieee80211_bss_conf *bss_conf; 384 struct ieee80211_if_managed *ifmgd; 385 int c = 0; 386 387 /* Make sure it's our interface that got changed */ 388 if (!wdev) 389 return NOTIFY_DONE; 390 391 if (wdev->wiphy != local->hw.wiphy) 392 return NOTIFY_DONE; 393 394 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 395 bss_conf = &sdata->vif.bss_conf; 396 397 /* ARP filtering is only supported in managed mode */ 398 if (sdata->vif.type != NL80211_IFTYPE_STATION) 399 return NOTIFY_DONE; 400 401 idev = __in_dev_get_rtnl(sdata->dev); 402 if (!idev) 403 return NOTIFY_DONE; 404 405 ifmgd = &sdata->u.mgd; 406 mutex_lock(&ifmgd->mtx); 407 408 /* Copy the addresses to the bss_conf list */ 409 ifa = idev->ifa_list; 410 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) { 411 bss_conf->arp_addr_list[c] = ifa->ifa_address; 412 ifa = ifa->ifa_next; 413 c++; 414 } 415 416 /* If not all addresses fit the list, disable filtering */ 417 if (ifa) { 418 sdata->arp_filter_state = false; 419 c = 0; 420 } else { 421 sdata->arp_filter_state = true; 422 } 423 bss_conf->arp_addr_cnt = c; 424 425 /* Configure driver only if associated (which also implies it is up) */ 426 if (ifmgd->associated) { 427 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 428 ieee80211_bss_info_change_notify(sdata, 429 BSS_CHANGED_ARP_FILTER); 430 } 431 432 mutex_unlock(&ifmgd->mtx); 433 434 return NOTIFY_DONE; 435 } 436 #endif 437 438 static int ieee80211_napi_poll(struct napi_struct *napi, int budget) 439 { 440 struct ieee80211_local *local = 441 container_of(napi, struct ieee80211_local, napi); 442 443 return local->ops->napi_poll(&local->hw, budget); 444 } 445 446 void ieee80211_napi_schedule(struct ieee80211_hw *hw) 447 { 448 struct ieee80211_local *local = hw_to_local(hw); 449 450 napi_schedule(&local->napi); 451 } 452 EXPORT_SYMBOL(ieee80211_napi_schedule); 453 454 void ieee80211_napi_complete(struct ieee80211_hw *hw) 455 { 456 struct ieee80211_local *local = hw_to_local(hw); 457 458 napi_complete(&local->napi); 459 } 460 EXPORT_SYMBOL(ieee80211_napi_complete); 461 462 /* There isn't a lot of sense in it, but you can transmit anything you like */ 463 static const struct ieee80211_txrx_stypes 464 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = { 465 [NL80211_IFTYPE_ADHOC] = { 466 .tx = 0xffff, 467 .rx = BIT(IEEE80211_STYPE_ACTION >> 4), 468 }, 469 [NL80211_IFTYPE_STATION] = { 470 .tx = 0xffff, 471 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 472 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 473 }, 474 [NL80211_IFTYPE_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_AP_VLAN] = { 485 /* copy AP */ 486 .tx = 0xffff, 487 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 488 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 489 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 490 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 491 BIT(IEEE80211_STYPE_AUTH >> 4) | 492 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 493 BIT(IEEE80211_STYPE_ACTION >> 4), 494 }, 495 [NL80211_IFTYPE_P2P_CLIENT] = { 496 .tx = 0xffff, 497 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 498 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 499 }, 500 [NL80211_IFTYPE_P2P_GO] = { 501 .tx = 0xffff, 502 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 503 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 504 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 505 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 506 BIT(IEEE80211_STYPE_AUTH >> 4) | 507 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 508 BIT(IEEE80211_STYPE_ACTION >> 4), 509 }, 510 [NL80211_IFTYPE_MESH_POINT] = { 511 .tx = 0xffff, 512 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 513 BIT(IEEE80211_STYPE_AUTH >> 4) | 514 BIT(IEEE80211_STYPE_DEAUTH >> 4), 515 }, 516 }; 517 518 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = { 519 .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR | 520 IEEE80211_HT_AMPDU_PARM_DENSITY, 521 522 .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 523 IEEE80211_HT_CAP_MAX_AMSDU | 524 IEEE80211_HT_CAP_SGI_40), 525 .mcs = { 526 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff, 527 0xff, 0xff, 0xff, 0xff, 0xff, }, 528 }, 529 }; 530 531 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 532 const struct ieee80211_ops *ops) 533 { 534 struct ieee80211_local *local; 535 int priv_size, i; 536 struct wiphy *wiphy; 537 538 /* Ensure 32-byte alignment of our private data and hw private data. 539 * We use the wiphy priv data for both our ieee80211_local and for 540 * the driver's private data 541 * 542 * In memory it'll be like this: 543 * 544 * +-------------------------+ 545 * | struct wiphy | 546 * +-------------------------+ 547 * | struct ieee80211_local | 548 * +-------------------------+ 549 * | driver's private data | 550 * +-------------------------+ 551 * 552 */ 553 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; 554 555 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 556 557 if (!wiphy) 558 return NULL; 559 560 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes; 561 562 wiphy->privid = mac80211_wiphy_privid; 563 564 wiphy->flags |= WIPHY_FLAG_NETNS_OK | 565 WIPHY_FLAG_4ADDR_AP | 566 WIPHY_FLAG_4ADDR_STATION | 567 WIPHY_FLAG_REPORTS_OBSS | 568 WIPHY_FLAG_OFFCHAN_TX | 569 WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL; 570 571 wiphy->features = NL80211_FEATURE_SK_TX_STATUS | 572 NL80211_FEATURE_HT_IBSS; 573 574 if (!ops->set_key) 575 wiphy->flags |= WIPHY_FLAG_IBSS_RSN; 576 577 wiphy->bss_priv_size = sizeof(struct ieee80211_bss); 578 579 local = wiphy_priv(wiphy); 580 581 local->hw.wiphy = wiphy; 582 583 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 584 585 BUG_ON(!ops->tx && !ops->tx_frags); 586 BUG_ON(!ops->start); 587 BUG_ON(!ops->stop); 588 BUG_ON(!ops->config); 589 BUG_ON(!ops->add_interface); 590 BUG_ON(!ops->remove_interface); 591 BUG_ON(!ops->configure_filter); 592 local->ops = ops; 593 594 /* set up some defaults */ 595 local->hw.queues = 1; 596 local->hw.max_rates = 1; 597 local->hw.max_report_rates = 0; 598 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 599 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 600 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 601 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 602 local->user_power_level = -1; 603 local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES; 604 local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN; 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 /* 619 * The rx_skb_queue is only accessed from tasklets, 620 * but other SKB queues are used from within IRQ 621 * context. Therefore, this one needs a different 622 * locking class so our direct, non-irq-safe use of 623 * the queue's lock doesn't throw lockdep warnings. 624 */ 625 skb_queue_head_init_class(&local->rx_skb_queue, 626 &ieee80211_rx_skb_queue_class); 627 628 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 629 630 ieee80211_work_init(local); 631 632 INIT_WORK(&local->restart_work, ieee80211_restart_work); 633 634 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter); 635 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work); 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_hw_roc_setup(local); 675 676 return local_to_hw(local); 677 } 678 EXPORT_SYMBOL(ieee80211_alloc_hw); 679 680 int 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; 687 static const u32 cipher_suites[] = { 688 /* keep WEP first, it may be removed below */ 689 WLAN_CIPHER_SUITE_WEP40, 690 WLAN_CIPHER_SUITE_WEP104, 691 WLAN_CIPHER_SUITE_TKIP, 692 WLAN_CIPHER_SUITE_CCMP, 693 694 /* keep last -- depends on hw flags! */ 695 WLAN_CIPHER_SUITE_AES_CMAC 696 }; 697 698 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) 699 #ifdef CONFIG_PM 700 && (!local->ops->suspend || !local->ops->resume) 701 #endif 702 ) 703 return -EINVAL; 704 705 if (hw->max_report_rates == 0) 706 hw->max_report_rates = hw->max_rates; 707 708 /* 709 * generic code guarantees at least one band, 710 * set this very early because much code assumes 711 * that hw.conf.channel is assigned 712 */ 713 channels = 0; 714 max_bitrates = 0; 715 supp_ht = false; 716 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 717 struct ieee80211_supported_band *sband; 718 719 sband = local->hw.wiphy->bands[band]; 720 if (!sband) 721 continue; 722 if (!local->oper_channel) { 723 /* init channel we're on */ 724 local->hw.conf.channel = 725 local->oper_channel = &sband->channels[0]; 726 local->hw.conf.channel_type = NL80211_CHAN_NO_HT; 727 } 728 channels += sband->n_channels; 729 730 if (max_bitrates < sband->n_bitrates) 731 max_bitrates = sband->n_bitrates; 732 supp_ht = supp_ht || sband->ht_cap.ht_supported; 733 } 734 735 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) + 736 sizeof(void *) * channels, GFP_KERNEL); 737 if (!local->int_scan_req) 738 return -ENOMEM; 739 740 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 741 if (!local->hw.wiphy->bands[band]) 742 continue; 743 local->int_scan_req->rates[band] = (u32) -1; 744 } 745 746 /* if low-level driver supports AP, we also support VLAN */ 747 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) { 748 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 749 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN); 750 } 751 752 /* mac80211 always supports monitor */ 753 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 754 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR); 755 756 /* 757 * mac80211 doesn't support more than 1 channel, and also not more 758 * than one IBSS interface 759 */ 760 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) { 761 const struct ieee80211_iface_combination *c; 762 int j; 763 764 c = &hw->wiphy->iface_combinations[i]; 765 766 if (c->num_different_channels > 1) 767 return -EINVAL; 768 769 for (j = 0; j < c->n_limits; j++) 770 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) && 771 c->limits[j].max > 1) 772 return -EINVAL; 773 } 774 775 #ifndef CONFIG_MAC80211_MESH 776 /* mesh depends on Kconfig, but drivers should set it if they want */ 777 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT); 778 #endif 779 780 /* if the underlying driver supports mesh, mac80211 will (at least) 781 * provide routing of mesh authentication frames to userspace */ 782 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT)) 783 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH; 784 785 /* mac80211 supports control port protocol changing */ 786 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL; 787 788 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 789 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 790 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 791 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 792 793 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) 794 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK), 795 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"); 796 797 /* 798 * Calculate scan IE length -- we need this to alloc 799 * memory and to subtract from the driver limit. It 800 * includes the DS Params, (extended) supported rates, and HT 801 * information -- SSID is the driver's responsibility. 802 */ 803 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ + 804 3 /* DS Params */; 805 if (supp_ht) 806 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 807 808 if (!local->ops->hw_scan) { 809 /* For hw_scan, driver needs to set these up. */ 810 local->hw.wiphy->max_scan_ssids = 4; 811 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 812 } 813 814 /* 815 * If the driver supports any scan IEs, then assume the 816 * limit includes the IEs mac80211 will add, otherwise 817 * leave it at zero and let the driver sort it out; we 818 * still pass our IEs to the driver but userspace will 819 * not be allowed to in that case. 820 */ 821 if (local->hw.wiphy->max_scan_ie_len) 822 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 823 824 /* Set up cipher suites unless driver already did */ 825 if (!local->hw.wiphy->cipher_suites) { 826 local->hw.wiphy->cipher_suites = cipher_suites; 827 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 828 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) 829 local->hw.wiphy->n_cipher_suites--; 830 } 831 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) { 832 if (local->hw.wiphy->cipher_suites == cipher_suites) { 833 local->hw.wiphy->cipher_suites += 2; 834 local->hw.wiphy->n_cipher_suites -= 2; 835 } else { 836 u32 *suites; 837 int r, w = 0; 838 839 /* Filter out WEP */ 840 841 suites = kmemdup( 842 local->hw.wiphy->cipher_suites, 843 sizeof(u32) * local->hw.wiphy->n_cipher_suites, 844 GFP_KERNEL); 845 if (!suites) 846 return -ENOMEM; 847 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) { 848 u32 suite = local->hw.wiphy->cipher_suites[r]; 849 if (suite == WLAN_CIPHER_SUITE_WEP40 || 850 suite == WLAN_CIPHER_SUITE_WEP104) 851 continue; 852 suites[w++] = suite; 853 } 854 local->hw.wiphy->cipher_suites = suites; 855 local->hw.wiphy->n_cipher_suites = w; 856 local->wiphy_ciphers_allocated = true; 857 } 858 } 859 860 if (!local->ops->remain_on_channel) 861 local->hw.wiphy->max_remain_on_channel_duration = 5000; 862 863 if (local->ops->sched_scan_start) 864 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN; 865 866 /* mac80211 based drivers don't support internal TDLS setup */ 867 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) 868 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP; 869 870 result = wiphy_register(local->hw.wiphy); 871 if (result < 0) 872 goto fail_wiphy_register; 873 874 /* 875 * We use the number of queues for feature tests (QoS, HT) internally 876 * so restrict them appropriately. 877 */ 878 if (hw->queues > IEEE80211_MAX_QUEUES) 879 hw->queues = IEEE80211_MAX_QUEUES; 880 881 local->workqueue = 882 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0); 883 if (!local->workqueue) { 884 result = -ENOMEM; 885 goto fail_workqueue; 886 } 887 888 /* 889 * The hardware needs headroom for sending the frame, 890 * and we need some headroom for passing the frame to monitor 891 * interfaces, but never both at the same time. 892 */ 893 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 894 IEEE80211_TX_STATUS_HEADROOM); 895 896 debugfs_hw_add(local); 897 898 /* 899 * if the driver doesn't specify a max listen interval we 900 * use 5 which should be a safe default 901 */ 902 if (local->hw.max_listen_interval == 0) 903 local->hw.max_listen_interval = 5; 904 905 local->hw.conf.listen_interval = local->hw.max_listen_interval; 906 907 local->dynamic_ps_forced_timeout = -1; 908 909 result = ieee80211_wep_init(local); 910 if (result < 0) 911 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n", 912 result); 913 914 rtnl_lock(); 915 916 result = ieee80211_init_rate_ctrl_alg(local, 917 hw->rate_control_algorithm); 918 if (result < 0) { 919 wiphy_debug(local->hw.wiphy, 920 "Failed to initialize rate control algorithm\n"); 921 goto fail_rate; 922 } 923 924 /* add one default STA interface if supported */ 925 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 926 result = ieee80211_if_add(local, "wlan%d", NULL, 927 NL80211_IFTYPE_STATION, NULL); 928 if (result) 929 wiphy_warn(local->hw.wiphy, 930 "Failed to add default virtual iface\n"); 931 } 932 933 rtnl_unlock(); 934 935 ieee80211_led_init(local); 936 937 local->network_latency_notifier.notifier_call = 938 ieee80211_max_network_latency; 939 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 940 &local->network_latency_notifier); 941 if (result) { 942 rtnl_lock(); 943 goto fail_pm_qos; 944 } 945 946 #ifdef CONFIG_INET 947 local->ifa_notifier.notifier_call = ieee80211_ifa_changed; 948 result = register_inetaddr_notifier(&local->ifa_notifier); 949 if (result) 950 goto fail_ifa; 951 #endif 952 953 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll, 954 local->hw.napi_weight); 955 956 return 0; 957 958 #ifdef CONFIG_INET 959 fail_ifa: 960 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 961 &local->network_latency_notifier); 962 rtnl_lock(); 963 #endif 964 fail_pm_qos: 965 ieee80211_led_exit(local); 966 ieee80211_remove_interfaces(local); 967 fail_rate: 968 rtnl_unlock(); 969 ieee80211_wep_free(local); 970 sta_info_stop(local); 971 destroy_workqueue(local->workqueue); 972 fail_workqueue: 973 wiphy_unregister(local->hw.wiphy); 974 fail_wiphy_register: 975 if (local->wiphy_ciphers_allocated) 976 kfree(local->hw.wiphy->cipher_suites); 977 kfree(local->int_scan_req); 978 return result; 979 } 980 EXPORT_SYMBOL(ieee80211_register_hw); 981 982 void ieee80211_unregister_hw(struct ieee80211_hw *hw) 983 { 984 struct ieee80211_local *local = hw_to_local(hw); 985 986 tasklet_kill(&local->tx_pending_tasklet); 987 tasklet_kill(&local->tasklet); 988 989 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 990 &local->network_latency_notifier); 991 #ifdef CONFIG_INET 992 unregister_inetaddr_notifier(&local->ifa_notifier); 993 #endif 994 995 rtnl_lock(); 996 997 /* 998 * At this point, interface list manipulations are fine 999 * because the driver cannot be handing us frames any 1000 * more and the tasklet is killed. 1001 */ 1002 ieee80211_remove_interfaces(local); 1003 1004 rtnl_unlock(); 1005 1006 /* 1007 * Now all work items will be gone, but the 1008 * timer might still be armed, so delete it 1009 */ 1010 del_timer_sync(&local->work_timer); 1011 1012 cancel_work_sync(&local->restart_work); 1013 cancel_work_sync(&local->reconfig_filter); 1014 1015 ieee80211_clear_tx_pending(local); 1016 rate_control_deinitialize(local); 1017 1018 if (skb_queue_len(&local->skb_queue) || 1019 skb_queue_len(&local->skb_queue_unreliable)) 1020 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n"); 1021 skb_queue_purge(&local->skb_queue); 1022 skb_queue_purge(&local->skb_queue_unreliable); 1023 skb_queue_purge(&local->rx_skb_queue); 1024 1025 destroy_workqueue(local->workqueue); 1026 wiphy_unregister(local->hw.wiphy); 1027 sta_info_stop(local); 1028 ieee80211_wep_free(local); 1029 ieee80211_led_exit(local); 1030 kfree(local->int_scan_req); 1031 } 1032 EXPORT_SYMBOL(ieee80211_unregister_hw); 1033 1034 static int ieee80211_free_ack_frame(int id, void *p, void *data) 1035 { 1036 WARN_ONCE(1, "Have pending ack frames!\n"); 1037 kfree_skb(p); 1038 return 0; 1039 } 1040 1041 void ieee80211_free_hw(struct ieee80211_hw *hw) 1042 { 1043 struct ieee80211_local *local = hw_to_local(hw); 1044 1045 mutex_destroy(&local->iflist_mtx); 1046 mutex_destroy(&local->mtx); 1047 1048 if (local->wiphy_ciphers_allocated) 1049 kfree(local->hw.wiphy->cipher_suites); 1050 1051 idr_for_each(&local->ack_status_frames, 1052 ieee80211_free_ack_frame, NULL); 1053 idr_destroy(&local->ack_status_frames); 1054 1055 wiphy_free(local->hw.wiphy); 1056 } 1057 EXPORT_SYMBOL(ieee80211_free_hw); 1058 1059 static int __init ieee80211_init(void) 1060 { 1061 struct sk_buff *skb; 1062 int ret; 1063 1064 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1065 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1066 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1067 1068 ret = rc80211_minstrel_init(); 1069 if (ret) 1070 return ret; 1071 1072 ret = rc80211_minstrel_ht_init(); 1073 if (ret) 1074 goto err_minstrel; 1075 1076 ret = rc80211_pid_init(); 1077 if (ret) 1078 goto err_pid; 1079 1080 ret = ieee80211_iface_init(); 1081 if (ret) 1082 goto err_netdev; 1083 1084 return 0; 1085 err_netdev: 1086 rc80211_pid_exit(); 1087 err_pid: 1088 rc80211_minstrel_ht_exit(); 1089 err_minstrel: 1090 rc80211_minstrel_exit(); 1091 1092 return ret; 1093 } 1094 1095 static void __exit ieee80211_exit(void) 1096 { 1097 rc80211_pid_exit(); 1098 rc80211_minstrel_ht_exit(); 1099 rc80211_minstrel_exit(); 1100 1101 if (mesh_allocated) 1102 ieee80211s_stop(); 1103 1104 ieee80211_iface_exit(); 1105 1106 rcu_barrier(); 1107 } 1108 1109 1110 subsys_initcall(ieee80211_init); 1111 module_exit(ieee80211_exit); 1112 1113 MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1114 MODULE_LICENSE("GPL"); 1115