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 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 203 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 204 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 205 else if (sdata->vif.type == NL80211_IFTYPE_AP) 206 sdata->vif.bss_conf.bssid = sdata->vif.addr; 207 else if (sdata->vif.type == NL80211_IFTYPE_WDS) 208 sdata->vif.bss_conf.bssid = NULL; 209 else if (ieee80211_vif_is_mesh(&sdata->vif)) { 210 sdata->vif.bss_conf.bssid = zero; 211 } else { 212 WARN_ON(1); 213 return; 214 } 215 216 switch (sdata->vif.type) { 217 case NL80211_IFTYPE_AP: 218 case NL80211_IFTYPE_ADHOC: 219 case NL80211_IFTYPE_WDS: 220 case NL80211_IFTYPE_MESH_POINT: 221 break; 222 default: 223 /* do not warn to simplify caller in scan.c */ 224 changed &= ~BSS_CHANGED_BEACON_ENABLED; 225 if (WARN_ON(changed & BSS_CHANGED_BEACON)) 226 return; 227 break; 228 } 229 230 if (changed & BSS_CHANGED_BEACON_ENABLED) { 231 if (local->quiescing || !ieee80211_sdata_running(sdata) || 232 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) { 233 sdata->vif.bss_conf.enable_beacon = false; 234 } else { 235 /* 236 * Beacon should be enabled, but AP mode must 237 * check whether there is a beacon configured. 238 */ 239 switch (sdata->vif.type) { 240 case NL80211_IFTYPE_AP: 241 sdata->vif.bss_conf.enable_beacon = 242 !!sdata->u.ap.beacon; 243 break; 244 case NL80211_IFTYPE_ADHOC: 245 sdata->vif.bss_conf.enable_beacon = 246 !!sdata->u.ibss.presp; 247 break; 248 #ifdef CONFIG_MAC80211_MESH 249 case NL80211_IFTYPE_MESH_POINT: 250 sdata->vif.bss_conf.enable_beacon = 251 !!sdata->u.mesh.mesh_id_len; 252 break; 253 #endif 254 default: 255 /* not reached */ 256 WARN_ON(1); 257 break; 258 } 259 } 260 } 261 262 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed); 263 } 264 265 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 266 { 267 sdata->vif.bss_conf.use_cts_prot = false; 268 sdata->vif.bss_conf.use_short_preamble = false; 269 sdata->vif.bss_conf.use_short_slot = false; 270 return BSS_CHANGED_ERP_CTS_PROT | 271 BSS_CHANGED_ERP_PREAMBLE | 272 BSS_CHANGED_ERP_SLOT; 273 } 274 275 static void ieee80211_tasklet_handler(unsigned long data) 276 { 277 struct ieee80211_local *local = (struct ieee80211_local *) data; 278 struct sta_info *sta, *tmp; 279 struct skb_eosp_msg_data *eosp_data; 280 struct sk_buff *skb; 281 282 while ((skb = skb_dequeue(&local->skb_queue)) || 283 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 284 switch (skb->pkt_type) { 285 case IEEE80211_RX_MSG: 286 /* Clear skb->pkt_type in order to not confuse kernel 287 * netstack. */ 288 skb->pkt_type = 0; 289 ieee80211_rx(&local->hw, skb); 290 break; 291 case IEEE80211_TX_STATUS_MSG: 292 skb->pkt_type = 0; 293 ieee80211_tx_status(&local->hw, skb); 294 break; 295 case IEEE80211_EOSP_MSG: 296 eosp_data = (void *)skb->cb; 297 for_each_sta_info(local, eosp_data->sta, sta, tmp) { 298 /* skip wrong virtual interface */ 299 if (memcmp(eosp_data->iface, 300 sta->sdata->vif.addr, ETH_ALEN)) 301 continue; 302 clear_sta_flag(sta, WLAN_STA_SP); 303 break; 304 } 305 dev_kfree_skb(skb); 306 break; 307 default: 308 WARN(1, "mac80211: Packet is of unknown type %d\n", 309 skb->pkt_type); 310 dev_kfree_skb(skb); 311 break; 312 } 313 } 314 } 315 316 static void ieee80211_restart_work(struct work_struct *work) 317 { 318 struct ieee80211_local *local = 319 container_of(work, struct ieee80211_local, restart_work); 320 321 /* wait for scan work complete */ 322 flush_workqueue(local->workqueue); 323 324 mutex_lock(&local->mtx); 325 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) || 326 local->sched_scanning, 327 "%s called with hardware scan in progress\n", __func__); 328 mutex_unlock(&local->mtx); 329 330 rtnl_lock(); 331 ieee80211_scan_cancel(local); 332 ieee80211_reconfig(local); 333 rtnl_unlock(); 334 } 335 336 void ieee80211_restart_hw(struct ieee80211_hw *hw) 337 { 338 struct ieee80211_local *local = hw_to_local(hw); 339 340 trace_api_restart_hw(local); 341 342 wiphy_info(hw->wiphy, 343 "Hardware restart was requested\n"); 344 345 /* use this reason, ieee80211_reconfig will unblock it */ 346 ieee80211_stop_queues_by_reason(hw, 347 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 348 349 schedule_work(&local->restart_work); 350 } 351 EXPORT_SYMBOL(ieee80211_restart_hw); 352 353 static void ieee80211_recalc_smps_work(struct work_struct *work) 354 { 355 struct ieee80211_local *local = 356 container_of(work, struct ieee80211_local, recalc_smps); 357 358 mutex_lock(&local->iflist_mtx); 359 ieee80211_recalc_smps(local); 360 mutex_unlock(&local->iflist_mtx); 361 } 362 363 #ifdef CONFIG_INET 364 static int ieee80211_ifa_changed(struct notifier_block *nb, 365 unsigned long data, void *arg) 366 { 367 struct in_ifaddr *ifa = arg; 368 struct ieee80211_local *local = 369 container_of(nb, struct ieee80211_local, 370 ifa_notifier); 371 struct net_device *ndev = ifa->ifa_dev->dev; 372 struct wireless_dev *wdev = ndev->ieee80211_ptr; 373 struct in_device *idev; 374 struct ieee80211_sub_if_data *sdata; 375 struct ieee80211_bss_conf *bss_conf; 376 struct ieee80211_if_managed *ifmgd; 377 int c = 0; 378 379 /* Make sure it's our interface that got changed */ 380 if (!wdev) 381 return NOTIFY_DONE; 382 383 if (wdev->wiphy != local->hw.wiphy) 384 return NOTIFY_DONE; 385 386 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 387 bss_conf = &sdata->vif.bss_conf; 388 389 /* ARP filtering is only supported in managed mode */ 390 if (sdata->vif.type != NL80211_IFTYPE_STATION) 391 return NOTIFY_DONE; 392 393 idev = __in_dev_get_rtnl(sdata->dev); 394 if (!idev) 395 return NOTIFY_DONE; 396 397 ifmgd = &sdata->u.mgd; 398 mutex_lock(&ifmgd->mtx); 399 400 /* Copy the addresses to the bss_conf list */ 401 ifa = idev->ifa_list; 402 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) { 403 bss_conf->arp_addr_list[c] = ifa->ifa_address; 404 ifa = ifa->ifa_next; 405 c++; 406 } 407 408 /* If not all addresses fit the list, disable filtering */ 409 if (ifa) { 410 sdata->arp_filter_state = false; 411 c = 0; 412 } else { 413 sdata->arp_filter_state = true; 414 } 415 bss_conf->arp_addr_cnt = c; 416 417 /* Configure driver only if associated (which also implies it is up) */ 418 if (ifmgd->associated) { 419 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 420 ieee80211_bss_info_change_notify(sdata, 421 BSS_CHANGED_ARP_FILTER); 422 } 423 424 mutex_unlock(&ifmgd->mtx); 425 426 return NOTIFY_DONE; 427 } 428 #endif 429 430 static int ieee80211_napi_poll(struct napi_struct *napi, int budget) 431 { 432 struct ieee80211_local *local = 433 container_of(napi, struct ieee80211_local, napi); 434 435 return local->ops->napi_poll(&local->hw, budget); 436 } 437 438 void ieee80211_napi_schedule(struct ieee80211_hw *hw) 439 { 440 struct ieee80211_local *local = hw_to_local(hw); 441 442 napi_schedule(&local->napi); 443 } 444 EXPORT_SYMBOL(ieee80211_napi_schedule); 445 446 void ieee80211_napi_complete(struct ieee80211_hw *hw) 447 { 448 struct ieee80211_local *local = hw_to_local(hw); 449 450 napi_complete(&local->napi); 451 } 452 EXPORT_SYMBOL(ieee80211_napi_complete); 453 454 /* There isn't a lot of sense in it, but you can transmit anything you like */ 455 static const struct ieee80211_txrx_stypes 456 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = { 457 [NL80211_IFTYPE_ADHOC] = { 458 .tx = 0xffff, 459 .rx = BIT(IEEE80211_STYPE_ACTION >> 4), 460 }, 461 [NL80211_IFTYPE_STATION] = { 462 .tx = 0xffff, 463 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 464 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 465 }, 466 [NL80211_IFTYPE_AP] = { 467 .tx = 0xffff, 468 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 469 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 470 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 471 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 472 BIT(IEEE80211_STYPE_AUTH >> 4) | 473 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 474 BIT(IEEE80211_STYPE_ACTION >> 4), 475 }, 476 [NL80211_IFTYPE_AP_VLAN] = { 477 /* copy AP */ 478 .tx = 0xffff, 479 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 480 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 481 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 482 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 483 BIT(IEEE80211_STYPE_AUTH >> 4) | 484 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 485 BIT(IEEE80211_STYPE_ACTION >> 4), 486 }, 487 [NL80211_IFTYPE_P2P_CLIENT] = { 488 .tx = 0xffff, 489 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 490 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 491 }, 492 [NL80211_IFTYPE_P2P_GO] = { 493 .tx = 0xffff, 494 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 495 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 496 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 497 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 498 BIT(IEEE80211_STYPE_AUTH >> 4) | 499 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 500 BIT(IEEE80211_STYPE_ACTION >> 4), 501 }, 502 [NL80211_IFTYPE_MESH_POINT] = { 503 .tx = 0xffff, 504 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 505 BIT(IEEE80211_STYPE_AUTH >> 4) | 506 BIT(IEEE80211_STYPE_DEAUTH >> 4), 507 }, 508 }; 509 510 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = { 511 .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR | 512 IEEE80211_HT_AMPDU_PARM_DENSITY, 513 514 .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 515 IEEE80211_HT_CAP_MAX_AMSDU | 516 IEEE80211_HT_CAP_SGI_40), 517 .mcs = { 518 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff, 519 0xff, 0xff, 0xff, 0xff, 0xff, }, 520 }, 521 }; 522 523 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 524 const struct ieee80211_ops *ops) 525 { 526 struct ieee80211_local *local; 527 int priv_size, i; 528 struct wiphy *wiphy; 529 530 if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove))) 531 return NULL; 532 533 /* Ensure 32-byte alignment of our private data and hw private data. 534 * We use the wiphy priv data for both our ieee80211_local and for 535 * the driver's private data 536 * 537 * In memory it'll be like this: 538 * 539 * +-------------------------+ 540 * | struct wiphy | 541 * +-------------------------+ 542 * | struct ieee80211_local | 543 * +-------------------------+ 544 * | driver's private data | 545 * +-------------------------+ 546 * 547 */ 548 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; 549 550 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 551 552 if (!wiphy) 553 return NULL; 554 555 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes; 556 557 wiphy->privid = mac80211_wiphy_privid; 558 559 wiphy->flags |= WIPHY_FLAG_NETNS_OK | 560 WIPHY_FLAG_4ADDR_AP | 561 WIPHY_FLAG_4ADDR_STATION | 562 WIPHY_FLAG_REPORTS_OBSS | 563 WIPHY_FLAG_OFFCHAN_TX | 564 WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL; 565 566 wiphy->features = NL80211_FEATURE_SK_TX_STATUS | 567 NL80211_FEATURE_HT_IBSS; 568 569 if (!ops->set_key) 570 wiphy->flags |= WIPHY_FLAG_IBSS_RSN; 571 572 wiphy->bss_priv_size = sizeof(struct ieee80211_bss); 573 574 local = wiphy_priv(wiphy); 575 576 local->hw.wiphy = wiphy; 577 578 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 579 580 BUG_ON(!ops->tx && !ops->tx_frags); 581 BUG_ON(!ops->start); 582 BUG_ON(!ops->stop); 583 BUG_ON(!ops->config); 584 BUG_ON(!ops->add_interface); 585 BUG_ON(!ops->remove_interface); 586 BUG_ON(!ops->configure_filter); 587 local->ops = ops; 588 589 /* set up some defaults */ 590 local->hw.queues = 1; 591 local->hw.max_rates = 1; 592 local->hw.max_report_rates = 0; 593 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 594 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 595 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 596 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 597 local->user_power_level = -1; 598 wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask; 599 600 INIT_LIST_HEAD(&local->interfaces); 601 602 __hw_addr_init(&local->mc_list); 603 604 mutex_init(&local->iflist_mtx); 605 mutex_init(&local->mtx); 606 607 mutex_init(&local->key_mtx); 608 spin_lock_init(&local->filter_lock); 609 spin_lock_init(&local->queue_stop_reason_lock); 610 611 /* 612 * The rx_skb_queue is only accessed from tasklets, 613 * but other SKB queues are used from within IRQ 614 * context. Therefore, this one needs a different 615 * locking class so our direct, non-irq-safe use of 616 * the queue's lock doesn't throw lockdep warnings. 617 */ 618 skb_queue_head_init_class(&local->rx_skb_queue, 619 &ieee80211_rx_skb_queue_class); 620 621 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 622 623 ieee80211_work_init(local); 624 625 INIT_WORK(&local->restart_work, ieee80211_restart_work); 626 627 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter); 628 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work); 629 local->smps_mode = IEEE80211_SMPS_OFF; 630 631 INIT_WORK(&local->dynamic_ps_enable_work, 632 ieee80211_dynamic_ps_enable_work); 633 INIT_WORK(&local->dynamic_ps_disable_work, 634 ieee80211_dynamic_ps_disable_work); 635 setup_timer(&local->dynamic_ps_timer, 636 ieee80211_dynamic_ps_timer, (unsigned long) local); 637 638 INIT_WORK(&local->sched_scan_stopped_work, 639 ieee80211_sched_scan_stopped_work); 640 641 spin_lock_init(&local->ack_status_lock); 642 idr_init(&local->ack_status_frames); 643 /* preallocate at least one entry */ 644 idr_pre_get(&local->ack_status_frames, GFP_KERNEL); 645 646 sta_info_init(local); 647 648 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 649 skb_queue_head_init(&local->pending[i]); 650 atomic_set(&local->agg_queue_stop[i], 0); 651 } 652 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 653 (unsigned long)local); 654 655 tasklet_init(&local->tasklet, 656 ieee80211_tasklet_handler, 657 (unsigned long) local); 658 659 skb_queue_head_init(&local->skb_queue); 660 skb_queue_head_init(&local->skb_queue_unreliable); 661 662 /* init dummy netdev for use w/ NAPI */ 663 init_dummy_netdev(&local->napi_dev); 664 665 ieee80211_led_names(local); 666 667 ieee80211_hw_roc_setup(local); 668 669 return &local->hw; 670 } 671 EXPORT_SYMBOL(ieee80211_alloc_hw); 672 673 int ieee80211_register_hw(struct ieee80211_hw *hw) 674 { 675 struct ieee80211_local *local = hw_to_local(hw); 676 int result, i; 677 enum ieee80211_band band; 678 int channels, max_bitrates; 679 bool supp_ht; 680 static const u32 cipher_suites[] = { 681 /* keep WEP first, it may be removed below */ 682 WLAN_CIPHER_SUITE_WEP40, 683 WLAN_CIPHER_SUITE_WEP104, 684 WLAN_CIPHER_SUITE_TKIP, 685 WLAN_CIPHER_SUITE_CCMP, 686 687 /* keep last -- depends on hw flags! */ 688 WLAN_CIPHER_SUITE_AES_CMAC 689 }; 690 691 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) 692 #ifdef CONFIG_PM 693 && (!local->ops->suspend || !local->ops->resume) 694 #endif 695 ) 696 return -EINVAL; 697 698 if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan) 699 return -EINVAL; 700 701 if (hw->max_report_rates == 0) 702 hw->max_report_rates = hw->max_rates; 703 704 /* 705 * generic code guarantees at least one band, 706 * set this very early because much code assumes 707 * that hw.conf.channel is assigned 708 */ 709 channels = 0; 710 max_bitrates = 0; 711 supp_ht = false; 712 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 713 struct ieee80211_supported_band *sband; 714 715 sband = local->hw.wiphy->bands[band]; 716 if (!sband) 717 continue; 718 if (!local->oper_channel) { 719 /* init channel we're on */ 720 local->hw.conf.channel = 721 local->oper_channel = &sband->channels[0]; 722 local->hw.conf.channel_type = NL80211_CHAN_NO_HT; 723 } 724 channels += sband->n_channels; 725 726 if (max_bitrates < sband->n_bitrates) 727 max_bitrates = sband->n_bitrates; 728 supp_ht = supp_ht || sband->ht_cap.ht_supported; 729 } 730 731 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) + 732 sizeof(void *) * channels, GFP_KERNEL); 733 if (!local->int_scan_req) 734 return -ENOMEM; 735 736 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 737 if (!local->hw.wiphy->bands[band]) 738 continue; 739 local->int_scan_req->rates[band] = (u32) -1; 740 } 741 742 /* if low-level driver supports AP, we also support VLAN */ 743 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) { 744 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 745 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN); 746 } 747 748 /* mac80211 always supports monitor */ 749 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 750 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR); 751 752 /* 753 * mac80211 doesn't support more than 1 channel, and also not more 754 * than one IBSS interface 755 */ 756 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) { 757 const struct ieee80211_iface_combination *c; 758 int j; 759 760 c = &hw->wiphy->iface_combinations[i]; 761 762 if (c->num_different_channels > 1) 763 return -EINVAL; 764 765 for (j = 0; j < c->n_limits; j++) 766 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) && 767 c->limits[j].max > 1) 768 return -EINVAL; 769 } 770 771 #ifndef CONFIG_MAC80211_MESH 772 /* mesh depends on Kconfig, but drivers should set it if they want */ 773 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT); 774 #endif 775 776 /* if the underlying driver supports mesh, mac80211 will (at least) 777 * provide routing of mesh authentication frames to userspace */ 778 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT)) 779 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH; 780 781 /* mac80211 supports control port protocol changing */ 782 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL; 783 784 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 785 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 786 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 787 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 788 789 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) 790 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK), 791 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"); 792 793 /* 794 * Calculate scan IE length -- we need this to alloc 795 * memory and to subtract from the driver limit. It 796 * includes the DS Params, (extended) supported rates, and HT 797 * information -- SSID is the driver's responsibility. 798 */ 799 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ + 800 3 /* DS Params */; 801 if (supp_ht) 802 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 803 804 if (!local->ops->hw_scan) { 805 /* For hw_scan, driver needs to set these up. */ 806 local->hw.wiphy->max_scan_ssids = 4; 807 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 808 } 809 810 /* 811 * If the driver supports any scan IEs, then assume the 812 * limit includes the IEs mac80211 will add, otherwise 813 * leave it at zero and let the driver sort it out; we 814 * still pass our IEs to the driver but userspace will 815 * not be allowed to in that case. 816 */ 817 if (local->hw.wiphy->max_scan_ie_len) 818 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 819 820 /* Set up cipher suites unless driver already did */ 821 if (!local->hw.wiphy->cipher_suites) { 822 local->hw.wiphy->cipher_suites = cipher_suites; 823 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 824 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) 825 local->hw.wiphy->n_cipher_suites--; 826 } 827 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) { 828 if (local->hw.wiphy->cipher_suites == cipher_suites) { 829 local->hw.wiphy->cipher_suites += 2; 830 local->hw.wiphy->n_cipher_suites -= 2; 831 } else { 832 u32 *suites; 833 int r, w = 0; 834 835 /* Filter out WEP */ 836 837 suites = kmemdup( 838 local->hw.wiphy->cipher_suites, 839 sizeof(u32) * local->hw.wiphy->n_cipher_suites, 840 GFP_KERNEL); 841 if (!suites) 842 return -ENOMEM; 843 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) { 844 u32 suite = local->hw.wiphy->cipher_suites[r]; 845 if (suite == WLAN_CIPHER_SUITE_WEP40 || 846 suite == WLAN_CIPHER_SUITE_WEP104) 847 continue; 848 suites[w++] = suite; 849 } 850 local->hw.wiphy->cipher_suites = suites; 851 local->hw.wiphy->n_cipher_suites = w; 852 local->wiphy_ciphers_allocated = true; 853 } 854 } 855 856 if (!local->ops->remain_on_channel) 857 local->hw.wiphy->max_remain_on_channel_duration = 5000; 858 859 if (local->ops->sched_scan_start) 860 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN; 861 862 /* mac80211 based drivers don't support internal TDLS setup */ 863 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) 864 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP; 865 866 result = wiphy_register(local->hw.wiphy); 867 if (result < 0) 868 goto fail_wiphy_register; 869 870 /* 871 * We use the number of queues for feature tests (QoS, HT) internally 872 * so restrict them appropriately. 873 */ 874 if (hw->queues > IEEE80211_MAX_QUEUES) 875 hw->queues = IEEE80211_MAX_QUEUES; 876 877 local->workqueue = 878 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0); 879 if (!local->workqueue) { 880 result = -ENOMEM; 881 goto fail_workqueue; 882 } 883 884 /* 885 * The hardware needs headroom for sending the frame, 886 * and we need some headroom for passing the frame to monitor 887 * interfaces, but never both at the same time. 888 */ 889 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 890 IEEE80211_TX_STATUS_HEADROOM); 891 892 debugfs_hw_add(local); 893 894 /* 895 * if the driver doesn't specify a max listen interval we 896 * use 5 which should be a safe default 897 */ 898 if (local->hw.max_listen_interval == 0) 899 local->hw.max_listen_interval = 5; 900 901 local->hw.conf.listen_interval = local->hw.max_listen_interval; 902 903 local->dynamic_ps_forced_timeout = -1; 904 905 result = ieee80211_wep_init(local); 906 if (result < 0) 907 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n", 908 result); 909 910 ieee80211_led_init(local); 911 912 rtnl_lock(); 913 914 result = ieee80211_init_rate_ctrl_alg(local, 915 hw->rate_control_algorithm); 916 if (result < 0) { 917 wiphy_debug(local->hw.wiphy, 918 "Failed to initialize rate control algorithm\n"); 919 goto fail_rate; 920 } 921 922 /* add one default STA interface if supported */ 923 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 924 result = ieee80211_if_add(local, "wlan%d", NULL, 925 NL80211_IFTYPE_STATION, NULL); 926 if (result) 927 wiphy_warn(local->hw.wiphy, 928 "Failed to add default virtual iface\n"); 929 } 930 931 rtnl_unlock(); 932 933 local->network_latency_notifier.notifier_call = 934 ieee80211_max_network_latency; 935 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 936 &local->network_latency_notifier); 937 if (result) { 938 rtnl_lock(); 939 goto fail_pm_qos; 940 } 941 942 #ifdef CONFIG_INET 943 local->ifa_notifier.notifier_call = ieee80211_ifa_changed; 944 result = register_inetaddr_notifier(&local->ifa_notifier); 945 if (result) 946 goto fail_ifa; 947 #endif 948 949 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll, 950 local->hw.napi_weight); 951 952 return 0; 953 954 #ifdef CONFIG_INET 955 fail_ifa: 956 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 957 &local->network_latency_notifier); 958 rtnl_lock(); 959 #endif 960 fail_pm_qos: 961 ieee80211_led_exit(local); 962 ieee80211_remove_interfaces(local); 963 fail_rate: 964 rtnl_unlock(); 965 ieee80211_wep_free(local); 966 sta_info_stop(local); 967 destroy_workqueue(local->workqueue); 968 fail_workqueue: 969 wiphy_unregister(local->hw.wiphy); 970 fail_wiphy_register: 971 if (local->wiphy_ciphers_allocated) 972 kfree(local->hw.wiphy->cipher_suites); 973 kfree(local->int_scan_req); 974 return result; 975 } 976 EXPORT_SYMBOL(ieee80211_register_hw); 977 978 void ieee80211_unregister_hw(struct ieee80211_hw *hw) 979 { 980 struct ieee80211_local *local = hw_to_local(hw); 981 982 tasklet_kill(&local->tx_pending_tasklet); 983 tasklet_kill(&local->tasklet); 984 985 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 986 &local->network_latency_notifier); 987 #ifdef CONFIG_INET 988 unregister_inetaddr_notifier(&local->ifa_notifier); 989 #endif 990 991 rtnl_lock(); 992 993 /* 994 * At this point, interface list manipulations are fine 995 * because the driver cannot be handing us frames any 996 * more and the tasklet is killed. 997 */ 998 ieee80211_remove_interfaces(local); 999 1000 rtnl_unlock(); 1001 1002 /* 1003 * Now all work items will be gone, but the 1004 * timer might still be armed, so delete it 1005 */ 1006 del_timer_sync(&local->work_timer); 1007 1008 cancel_work_sync(&local->restart_work); 1009 cancel_work_sync(&local->reconfig_filter); 1010 1011 ieee80211_clear_tx_pending(local); 1012 rate_control_deinitialize(local); 1013 1014 if (skb_queue_len(&local->skb_queue) || 1015 skb_queue_len(&local->skb_queue_unreliable)) 1016 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n"); 1017 skb_queue_purge(&local->skb_queue); 1018 skb_queue_purge(&local->skb_queue_unreliable); 1019 skb_queue_purge(&local->rx_skb_queue); 1020 1021 destroy_workqueue(local->workqueue); 1022 wiphy_unregister(local->hw.wiphy); 1023 sta_info_stop(local); 1024 ieee80211_wep_free(local); 1025 ieee80211_led_exit(local); 1026 kfree(local->int_scan_req); 1027 } 1028 EXPORT_SYMBOL(ieee80211_unregister_hw); 1029 1030 static int ieee80211_free_ack_frame(int id, void *p, void *data) 1031 { 1032 WARN_ONCE(1, "Have pending ack frames!\n"); 1033 kfree_skb(p); 1034 return 0; 1035 } 1036 1037 void ieee80211_free_hw(struct ieee80211_hw *hw) 1038 { 1039 struct ieee80211_local *local = hw_to_local(hw); 1040 1041 mutex_destroy(&local->iflist_mtx); 1042 mutex_destroy(&local->mtx); 1043 1044 if (local->wiphy_ciphers_allocated) 1045 kfree(local->hw.wiphy->cipher_suites); 1046 1047 idr_for_each(&local->ack_status_frames, 1048 ieee80211_free_ack_frame, NULL); 1049 idr_destroy(&local->ack_status_frames); 1050 1051 wiphy_free(local->hw.wiphy); 1052 } 1053 EXPORT_SYMBOL(ieee80211_free_hw); 1054 1055 static int __init ieee80211_init(void) 1056 { 1057 struct sk_buff *skb; 1058 int ret; 1059 1060 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1061 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1062 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1063 1064 ret = rc80211_minstrel_init(); 1065 if (ret) 1066 return ret; 1067 1068 ret = rc80211_minstrel_ht_init(); 1069 if (ret) 1070 goto err_minstrel; 1071 1072 ret = rc80211_pid_init(); 1073 if (ret) 1074 goto err_pid; 1075 1076 ret = ieee80211_iface_init(); 1077 if (ret) 1078 goto err_netdev; 1079 1080 return 0; 1081 err_netdev: 1082 rc80211_pid_exit(); 1083 err_pid: 1084 rc80211_minstrel_ht_exit(); 1085 err_minstrel: 1086 rc80211_minstrel_exit(); 1087 1088 return ret; 1089 } 1090 1091 static void __exit ieee80211_exit(void) 1092 { 1093 rc80211_pid_exit(); 1094 rc80211_minstrel_ht_exit(); 1095 rc80211_minstrel_exit(); 1096 1097 if (mesh_allocated) 1098 ieee80211s_stop(); 1099 1100 ieee80211_iface_exit(); 1101 1102 rcu_barrier(); 1103 } 1104 1105 1106 subsys_initcall(ieee80211_init); 1107 module_exit(ieee80211_exit); 1108 1109 MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1110 MODULE_LICENSE("GPL"); 1111