1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #include <net/mac80211.h> 12 #include <linux/module.h> 13 #include <linux/init.h> 14 #include <linux/netdevice.h> 15 #include <linux/types.h> 16 #include <linux/slab.h> 17 #include <linux/skbuff.h> 18 #include <linux/etherdevice.h> 19 #include <linux/if_arp.h> 20 #include <linux/rtnetlink.h> 21 #include <linux/bitmap.h> 22 #include <linux/pm_qos.h> 23 #include <linux/inetdevice.h> 24 #include <net/net_namespace.h> 25 #include <net/cfg80211.h> 26 27 #include "ieee80211_i.h" 28 #include "driver-ops.h" 29 #include "rate.h" 30 #include "mesh.h" 31 #include "wep.h" 32 #include "led.h" 33 #include "cfg.h" 34 #include "debugfs.h" 35 36 static struct lock_class_key ieee80211_rx_skb_queue_class; 37 38 void ieee80211_configure_filter(struct ieee80211_local *local) 39 { 40 u64 mc; 41 unsigned int changed_flags; 42 unsigned int new_flags = 0; 43 44 if (atomic_read(&local->iff_promiscs)) 45 new_flags |= FIF_PROMISC_IN_BSS; 46 47 if (atomic_read(&local->iff_allmultis)) 48 new_flags |= FIF_ALLMULTI; 49 50 if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) || 51 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) 52 new_flags |= FIF_BCN_PRBRESP_PROMISC; 53 54 if (local->fif_probe_req || local->probe_req_reg) 55 new_flags |= FIF_PROBE_REQ; 56 57 if (local->fif_fcsfail) 58 new_flags |= FIF_FCSFAIL; 59 60 if (local->fif_plcpfail) 61 new_flags |= FIF_PLCPFAIL; 62 63 if (local->fif_control) 64 new_flags |= FIF_CONTROL; 65 66 if (local->fif_other_bss) 67 new_flags |= FIF_OTHER_BSS; 68 69 if (local->fif_pspoll) 70 new_flags |= FIF_PSPOLL; 71 72 spin_lock_bh(&local->filter_lock); 73 changed_flags = local->filter_flags ^ new_flags; 74 75 mc = drv_prepare_multicast(local, &local->mc_list); 76 spin_unlock_bh(&local->filter_lock); 77 78 /* be a bit nasty */ 79 new_flags |= (1<<31); 80 81 drv_configure_filter(local, changed_flags, &new_flags, mc); 82 83 WARN_ON(new_flags & (1<<31)); 84 85 local->filter_flags = new_flags & ~(1<<31); 86 } 87 88 static void ieee80211_reconfig_filter(struct work_struct *work) 89 { 90 struct ieee80211_local *local = 91 container_of(work, struct ieee80211_local, reconfig_filter); 92 93 ieee80211_configure_filter(local); 94 } 95 96 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 97 { 98 struct ieee80211_channel *chan; 99 int ret = 0; 100 int power; 101 enum nl80211_channel_type channel_type; 102 u32 offchannel_flag; 103 104 might_sleep(); 105 106 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 107 if (local->scan_channel) { 108 chan = local->scan_channel; 109 /* If scanning on oper channel, use whatever channel-type 110 * is currently in use. 111 */ 112 if (chan == local->oper_channel) 113 channel_type = local->_oper_channel_type; 114 else 115 channel_type = NL80211_CHAN_NO_HT; 116 } else if (local->tmp_channel) { 117 chan = local->tmp_channel; 118 channel_type = local->tmp_channel_type; 119 } else { 120 chan = local->oper_channel; 121 channel_type = local->_oper_channel_type; 122 } 123 124 if (chan != local->oper_channel || 125 channel_type != local->_oper_channel_type) 126 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL; 127 else 128 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL; 129 130 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 131 132 if (offchannel_flag || chan != local->hw.conf.channel || 133 channel_type != local->hw.conf.channel_type) { 134 local->hw.conf.channel = chan; 135 local->hw.conf.channel_type = channel_type; 136 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 137 } 138 139 if (!conf_is_ht(&local->hw.conf)) { 140 /* 141 * mac80211.h documents that this is only valid 142 * when the channel is set to an HT type, and 143 * that otherwise STATIC is used. 144 */ 145 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC; 146 } else if (local->hw.conf.smps_mode != local->smps_mode) { 147 local->hw.conf.smps_mode = local->smps_mode; 148 changed |= IEEE80211_CONF_CHANGE_SMPS; 149 } 150 151 if (test_bit(SCAN_SW_SCANNING, &local->scanning) || 152 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) || 153 test_bit(SCAN_HW_SCANNING, &local->scanning)) 154 power = chan->max_power; 155 else 156 power = local->power_constr_level ? 157 min(chan->max_power, 158 (chan->max_reg_power - local->power_constr_level)) : 159 chan->max_power; 160 161 if (local->user_power_level >= 0) 162 power = min(power, local->user_power_level); 163 164 if (local->hw.conf.power_level != power) { 165 changed |= IEEE80211_CONF_CHANGE_POWER; 166 local->hw.conf.power_level = power; 167 } 168 169 if (changed && local->open_count) { 170 ret = drv_config(local, changed); 171 /* 172 * Goal: 173 * HW reconfiguration should never fail, the driver has told 174 * us what it can support so it should live up to that promise. 175 * 176 * Current status: 177 * rfkill is not integrated with mac80211 and a 178 * configuration command can thus fail if hardware rfkill 179 * is enabled 180 * 181 * FIXME: integrate rfkill with mac80211 and then add this 182 * WARN_ON() back 183 * 184 */ 185 /* WARN_ON(ret); */ 186 } 187 188 return ret; 189 } 190 191 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 192 u32 changed) 193 { 194 struct ieee80211_local *local = sdata->local; 195 static const u8 zero[ETH_ALEN] = { 0 }; 196 197 if (!changed) 198 return; 199 200 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 201 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 202 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 203 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 204 else if (sdata->vif.type == NL80211_IFTYPE_AP) 205 sdata->vif.bss_conf.bssid = sdata->vif.addr; 206 else if (sdata->vif.type == NL80211_IFTYPE_WDS) 207 sdata->vif.bss_conf.bssid = NULL; 208 else if (ieee80211_vif_is_mesh(&sdata->vif)) { 209 sdata->vif.bss_conf.bssid = zero; 210 } else { 211 WARN_ON(1); 212 return; 213 } 214 215 switch (sdata->vif.type) { 216 case NL80211_IFTYPE_AP: 217 case NL80211_IFTYPE_ADHOC: 218 case NL80211_IFTYPE_WDS: 219 case NL80211_IFTYPE_MESH_POINT: 220 break; 221 default: 222 /* do not warn to simplify caller in scan.c */ 223 changed &= ~BSS_CHANGED_BEACON_ENABLED; 224 if (WARN_ON(changed & BSS_CHANGED_BEACON)) 225 return; 226 break; 227 } 228 229 if (changed & BSS_CHANGED_BEACON_ENABLED) { 230 if (local->quiescing || !ieee80211_sdata_running(sdata) || 231 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) { 232 sdata->vif.bss_conf.enable_beacon = false; 233 } else { 234 /* 235 * Beacon should be enabled, but AP mode must 236 * check whether there is a beacon configured. 237 */ 238 switch (sdata->vif.type) { 239 case NL80211_IFTYPE_AP: 240 sdata->vif.bss_conf.enable_beacon = 241 !!sdata->u.ap.beacon; 242 break; 243 case NL80211_IFTYPE_ADHOC: 244 sdata->vif.bss_conf.enable_beacon = 245 !!sdata->u.ibss.presp; 246 break; 247 #ifdef CONFIG_MAC80211_MESH 248 case NL80211_IFTYPE_MESH_POINT: 249 sdata->vif.bss_conf.enable_beacon = 250 !!sdata->u.mesh.mesh_id_len; 251 break; 252 #endif 253 default: 254 /* not reached */ 255 WARN_ON(1); 256 break; 257 } 258 } 259 } 260 261 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed); 262 } 263 264 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 265 { 266 sdata->vif.bss_conf.use_cts_prot = false; 267 sdata->vif.bss_conf.use_short_preamble = false; 268 sdata->vif.bss_conf.use_short_slot = false; 269 return BSS_CHANGED_ERP_CTS_PROT | 270 BSS_CHANGED_ERP_PREAMBLE | 271 BSS_CHANGED_ERP_SLOT; 272 } 273 274 static void ieee80211_tasklet_handler(unsigned long data) 275 { 276 struct ieee80211_local *local = (struct ieee80211_local *) data; 277 struct sta_info *sta, *tmp; 278 struct skb_eosp_msg_data *eosp_data; 279 struct sk_buff *skb; 280 281 while ((skb = skb_dequeue(&local->skb_queue)) || 282 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 283 switch (skb->pkt_type) { 284 case IEEE80211_RX_MSG: 285 /* Clear skb->pkt_type in order to not confuse kernel 286 * netstack. */ 287 skb->pkt_type = 0; 288 ieee80211_rx(&local->hw, skb); 289 break; 290 case IEEE80211_TX_STATUS_MSG: 291 skb->pkt_type = 0; 292 ieee80211_tx_status(&local->hw, skb); 293 break; 294 case IEEE80211_EOSP_MSG: 295 eosp_data = (void *)skb->cb; 296 for_each_sta_info(local, eosp_data->sta, sta, tmp) { 297 /* skip wrong virtual interface */ 298 if (memcmp(eosp_data->iface, 299 sta->sdata->vif.addr, ETH_ALEN)) 300 continue; 301 clear_sta_flag(sta, WLAN_STA_SP); 302 break; 303 } 304 dev_kfree_skb(skb); 305 break; 306 default: 307 WARN(1, "mac80211: Packet is of unknown type %d\n", 308 skb->pkt_type); 309 dev_kfree_skb(skb); 310 break; 311 } 312 } 313 } 314 315 static void ieee80211_restart_work(struct work_struct *work) 316 { 317 struct ieee80211_local *local = 318 container_of(work, struct ieee80211_local, restart_work); 319 320 /* wait for scan work complete */ 321 flush_workqueue(local->workqueue); 322 323 mutex_lock(&local->mtx); 324 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) || 325 local->sched_scanning, 326 "%s called with hardware scan in progress\n", __func__); 327 mutex_unlock(&local->mtx); 328 329 rtnl_lock(); 330 ieee80211_scan_cancel(local); 331 ieee80211_reconfig(local); 332 rtnl_unlock(); 333 } 334 335 void ieee80211_restart_hw(struct ieee80211_hw *hw) 336 { 337 struct ieee80211_local *local = hw_to_local(hw); 338 339 trace_api_restart_hw(local); 340 341 wiphy_info(hw->wiphy, 342 "Hardware restart was requested\n"); 343 344 /* use this reason, ieee80211_reconfig will unblock it */ 345 ieee80211_stop_queues_by_reason(hw, 346 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 347 348 schedule_work(&local->restart_work); 349 } 350 EXPORT_SYMBOL(ieee80211_restart_hw); 351 352 static void ieee80211_recalc_smps_work(struct work_struct *work) 353 { 354 struct ieee80211_local *local = 355 container_of(work, struct ieee80211_local, recalc_smps); 356 357 mutex_lock(&local->iflist_mtx); 358 ieee80211_recalc_smps(local); 359 mutex_unlock(&local->iflist_mtx); 360 } 361 362 #ifdef CONFIG_INET 363 static int ieee80211_ifa_changed(struct notifier_block *nb, 364 unsigned long data, void *arg) 365 { 366 struct in_ifaddr *ifa = arg; 367 struct ieee80211_local *local = 368 container_of(nb, struct ieee80211_local, 369 ifa_notifier); 370 struct net_device *ndev = ifa->ifa_dev->dev; 371 struct wireless_dev *wdev = ndev->ieee80211_ptr; 372 struct in_device *idev; 373 struct ieee80211_sub_if_data *sdata; 374 struct ieee80211_bss_conf *bss_conf; 375 struct ieee80211_if_managed *ifmgd; 376 int c = 0; 377 378 /* Make sure it's our interface that got changed */ 379 if (!wdev) 380 return NOTIFY_DONE; 381 382 if (wdev->wiphy != local->hw.wiphy) 383 return NOTIFY_DONE; 384 385 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 386 bss_conf = &sdata->vif.bss_conf; 387 388 /* ARP filtering is only supported in managed mode */ 389 if (sdata->vif.type != NL80211_IFTYPE_STATION) 390 return NOTIFY_DONE; 391 392 idev = __in_dev_get_rtnl(sdata->dev); 393 if (!idev) 394 return NOTIFY_DONE; 395 396 ifmgd = &sdata->u.mgd; 397 mutex_lock(&ifmgd->mtx); 398 399 /* Copy the addresses to the bss_conf list */ 400 ifa = idev->ifa_list; 401 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) { 402 bss_conf->arp_addr_list[c] = ifa->ifa_address; 403 ifa = ifa->ifa_next; 404 c++; 405 } 406 407 /* If not all addresses fit the list, disable filtering */ 408 if (ifa) { 409 sdata->arp_filter_state = false; 410 c = 0; 411 } else { 412 sdata->arp_filter_state = true; 413 } 414 bss_conf->arp_addr_cnt = c; 415 416 /* Configure driver only if associated (which also implies it is up) */ 417 if (ifmgd->associated) { 418 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 419 ieee80211_bss_info_change_notify(sdata, 420 BSS_CHANGED_ARP_FILTER); 421 } 422 423 mutex_unlock(&ifmgd->mtx); 424 425 return NOTIFY_DONE; 426 } 427 #endif 428 429 static int ieee80211_napi_poll(struct napi_struct *napi, int budget) 430 { 431 struct ieee80211_local *local = 432 container_of(napi, struct ieee80211_local, napi); 433 434 return local->ops->napi_poll(&local->hw, budget); 435 } 436 437 void ieee80211_napi_schedule(struct ieee80211_hw *hw) 438 { 439 struct ieee80211_local *local = hw_to_local(hw); 440 441 napi_schedule(&local->napi); 442 } 443 EXPORT_SYMBOL(ieee80211_napi_schedule); 444 445 void ieee80211_napi_complete(struct ieee80211_hw *hw) 446 { 447 struct ieee80211_local *local = hw_to_local(hw); 448 449 napi_complete(&local->napi); 450 } 451 EXPORT_SYMBOL(ieee80211_napi_complete); 452 453 /* There isn't a lot of sense in it, but you can transmit anything you like */ 454 static const struct ieee80211_txrx_stypes 455 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = { 456 [NL80211_IFTYPE_ADHOC] = { 457 .tx = 0xffff, 458 .rx = BIT(IEEE80211_STYPE_ACTION >> 4), 459 }, 460 [NL80211_IFTYPE_STATION] = { 461 .tx = 0xffff, 462 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 463 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 464 }, 465 [NL80211_IFTYPE_AP] = { 466 .tx = 0xffff, 467 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 468 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 469 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 470 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 471 BIT(IEEE80211_STYPE_AUTH >> 4) | 472 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 473 BIT(IEEE80211_STYPE_ACTION >> 4), 474 }, 475 [NL80211_IFTYPE_AP_VLAN] = { 476 /* copy AP */ 477 .tx = 0xffff, 478 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 479 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 480 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 481 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 482 BIT(IEEE80211_STYPE_AUTH >> 4) | 483 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 484 BIT(IEEE80211_STYPE_ACTION >> 4), 485 }, 486 [NL80211_IFTYPE_P2P_CLIENT] = { 487 .tx = 0xffff, 488 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 489 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 490 }, 491 [NL80211_IFTYPE_P2P_GO] = { 492 .tx = 0xffff, 493 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 494 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 495 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 496 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 497 BIT(IEEE80211_STYPE_AUTH >> 4) | 498 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 499 BIT(IEEE80211_STYPE_ACTION >> 4), 500 }, 501 [NL80211_IFTYPE_MESH_POINT] = { 502 .tx = 0xffff, 503 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 504 BIT(IEEE80211_STYPE_AUTH >> 4) | 505 BIT(IEEE80211_STYPE_DEAUTH >> 4), 506 }, 507 }; 508 509 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = { 510 .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR | 511 IEEE80211_HT_AMPDU_PARM_DENSITY, 512 513 .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 514 IEEE80211_HT_CAP_MAX_AMSDU | 515 IEEE80211_HT_CAP_SGI_40), 516 .mcs = { 517 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff, 518 0xff, 0xff, 0xff, 0xff, 0xff, }, 519 }, 520 }; 521 522 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 523 const struct ieee80211_ops *ops) 524 { 525 struct ieee80211_local *local; 526 int priv_size, i; 527 struct wiphy *wiphy; 528 529 if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove))) 530 return NULL; 531 532 /* Ensure 32-byte alignment of our private data and hw private data. 533 * We use the wiphy priv data for both our ieee80211_local and for 534 * the driver's private data 535 * 536 * In memory it'll be like this: 537 * 538 * +-------------------------+ 539 * | struct wiphy | 540 * +-------------------------+ 541 * | struct ieee80211_local | 542 * +-------------------------+ 543 * | driver's private data | 544 * +-------------------------+ 545 * 546 */ 547 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; 548 549 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 550 551 if (!wiphy) 552 return NULL; 553 554 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes; 555 556 wiphy->privid = mac80211_wiphy_privid; 557 558 wiphy->flags |= WIPHY_FLAG_NETNS_OK | 559 WIPHY_FLAG_4ADDR_AP | 560 WIPHY_FLAG_4ADDR_STATION | 561 WIPHY_FLAG_REPORTS_OBSS | 562 WIPHY_FLAG_OFFCHAN_TX; 563 564 if (ops->remain_on_channel) 565 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL; 566 567 wiphy->features = NL80211_FEATURE_SK_TX_STATUS | 568 NL80211_FEATURE_HT_IBSS; 569 570 if (!ops->set_key) 571 wiphy->flags |= WIPHY_FLAG_IBSS_RSN; 572 573 wiphy->bss_priv_size = sizeof(struct ieee80211_bss); 574 575 local = wiphy_priv(wiphy); 576 577 local->hw.wiphy = wiphy; 578 579 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 580 581 BUG_ON(!ops->tx && !ops->tx_frags); 582 BUG_ON(!ops->start); 583 BUG_ON(!ops->stop); 584 BUG_ON(!ops->config); 585 BUG_ON(!ops->add_interface); 586 BUG_ON(!ops->remove_interface); 587 BUG_ON(!ops->configure_filter); 588 local->ops = ops; 589 590 /* set up some defaults */ 591 local->hw.queues = 1; 592 local->hw.max_rates = 1; 593 local->hw.max_report_rates = 0; 594 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 595 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 596 local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE; 597 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 598 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 599 local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 600 IEEE80211_RADIOTAP_MCS_HAVE_GI | 601 IEEE80211_RADIOTAP_MCS_HAVE_BW; 602 local->user_power_level = -1; 603 wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask; 604 605 INIT_LIST_HEAD(&local->interfaces); 606 607 __hw_addr_init(&local->mc_list); 608 609 mutex_init(&local->iflist_mtx); 610 mutex_init(&local->mtx); 611 612 mutex_init(&local->key_mtx); 613 spin_lock_init(&local->filter_lock); 614 spin_lock_init(&local->queue_stop_reason_lock); 615 616 /* 617 * The rx_skb_queue is only accessed from tasklets, 618 * but other SKB queues are used from within IRQ 619 * context. Therefore, this one needs a different 620 * locking class so our direct, non-irq-safe use of 621 * the queue's lock doesn't throw lockdep warnings. 622 */ 623 skb_queue_head_init_class(&local->rx_skb_queue, 624 &ieee80211_rx_skb_queue_class); 625 626 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 627 628 ieee80211_work_init(local); 629 630 INIT_WORK(&local->restart_work, ieee80211_restart_work); 631 632 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter); 633 INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work); 634 local->smps_mode = IEEE80211_SMPS_OFF; 635 636 INIT_WORK(&local->dynamic_ps_enable_work, 637 ieee80211_dynamic_ps_enable_work); 638 INIT_WORK(&local->dynamic_ps_disable_work, 639 ieee80211_dynamic_ps_disable_work); 640 setup_timer(&local->dynamic_ps_timer, 641 ieee80211_dynamic_ps_timer, (unsigned long) local); 642 643 INIT_WORK(&local->sched_scan_stopped_work, 644 ieee80211_sched_scan_stopped_work); 645 646 spin_lock_init(&local->ack_status_lock); 647 idr_init(&local->ack_status_frames); 648 /* preallocate at least one entry */ 649 idr_pre_get(&local->ack_status_frames, GFP_KERNEL); 650 651 sta_info_init(local); 652 653 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 654 skb_queue_head_init(&local->pending[i]); 655 atomic_set(&local->agg_queue_stop[i], 0); 656 } 657 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 658 (unsigned long)local); 659 660 tasklet_init(&local->tasklet, 661 ieee80211_tasklet_handler, 662 (unsigned long) local); 663 664 skb_queue_head_init(&local->skb_queue); 665 skb_queue_head_init(&local->skb_queue_unreliable); 666 667 /* init dummy netdev for use w/ NAPI */ 668 init_dummy_netdev(&local->napi_dev); 669 670 ieee80211_led_names(local); 671 672 ieee80211_hw_roc_setup(local); 673 674 return &local->hw; 675 } 676 EXPORT_SYMBOL(ieee80211_alloc_hw); 677 678 int ieee80211_register_hw(struct ieee80211_hw *hw) 679 { 680 struct ieee80211_local *local = hw_to_local(hw); 681 int result, i; 682 enum ieee80211_band band; 683 int channels, max_bitrates; 684 bool supp_ht; 685 static const u32 cipher_suites[] = { 686 /* keep WEP first, it may be removed below */ 687 WLAN_CIPHER_SUITE_WEP40, 688 WLAN_CIPHER_SUITE_WEP104, 689 WLAN_CIPHER_SUITE_TKIP, 690 WLAN_CIPHER_SUITE_CCMP, 691 692 /* keep last -- depends on hw flags! */ 693 WLAN_CIPHER_SUITE_AES_CMAC 694 }; 695 696 if (hw->flags & IEEE80211_HW_QUEUE_CONTROL && 697 (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE || 698 local->hw.offchannel_tx_hw_queue >= local->hw.queues)) 699 return -EINVAL; 700 701 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) 702 #ifdef CONFIG_PM 703 && (!local->ops->suspend || !local->ops->resume) 704 #endif 705 ) 706 return -EINVAL; 707 708 if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan) 709 return -EINVAL; 710 711 if (hw->max_report_rates == 0) 712 hw->max_report_rates = hw->max_rates; 713 714 /* 715 * generic code guarantees at least one band, 716 * set this very early because much code assumes 717 * that hw.conf.channel is assigned 718 */ 719 channels = 0; 720 max_bitrates = 0; 721 supp_ht = false; 722 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 723 struct ieee80211_supported_band *sband; 724 725 sband = local->hw.wiphy->bands[band]; 726 if (!sband) 727 continue; 728 if (!local->oper_channel) { 729 /* init channel we're on */ 730 local->hw.conf.channel = 731 local->oper_channel = &sband->channels[0]; 732 local->hw.conf.channel_type = NL80211_CHAN_NO_HT; 733 } 734 channels += sband->n_channels; 735 736 if (max_bitrates < sband->n_bitrates) 737 max_bitrates = sband->n_bitrates; 738 supp_ht = supp_ht || sband->ht_cap.ht_supported; 739 } 740 741 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) + 742 sizeof(void *) * channels, GFP_KERNEL); 743 if (!local->int_scan_req) 744 return -ENOMEM; 745 746 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 747 if (!local->hw.wiphy->bands[band]) 748 continue; 749 local->int_scan_req->rates[band] = (u32) -1; 750 } 751 752 /* if low-level driver supports AP, we also support VLAN */ 753 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) { 754 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 755 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN); 756 } 757 758 /* mac80211 always supports monitor */ 759 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 760 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR); 761 762 /* 763 * mac80211 doesn't support more than 1 channel, and also not more 764 * than one IBSS interface 765 */ 766 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) { 767 const struct ieee80211_iface_combination *c; 768 int j; 769 770 c = &hw->wiphy->iface_combinations[i]; 771 772 if (c->num_different_channels > 1) 773 return -EINVAL; 774 775 for (j = 0; j < c->n_limits; j++) 776 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) && 777 c->limits[j].max > 1) 778 return -EINVAL; 779 } 780 781 #ifndef CONFIG_MAC80211_MESH 782 /* mesh depends on Kconfig, but drivers should set it if they want */ 783 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT); 784 #endif 785 786 /* if the underlying driver supports mesh, mac80211 will (at least) 787 * provide routing of mesh authentication frames to userspace */ 788 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT)) 789 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH; 790 791 /* mac80211 supports control port protocol changing */ 792 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL; 793 794 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 795 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 796 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 797 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 798 799 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) 800 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK), 801 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"); 802 803 /* 804 * Calculate scan IE length -- we need this to alloc 805 * memory and to subtract from the driver limit. It 806 * includes the DS Params, (extended) supported rates, and HT 807 * information -- SSID is the driver's responsibility. 808 */ 809 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ + 810 3 /* DS Params */; 811 if (supp_ht) 812 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 813 814 if (!local->ops->hw_scan) { 815 /* For hw_scan, driver needs to set these up. */ 816 local->hw.wiphy->max_scan_ssids = 4; 817 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 818 } 819 820 /* 821 * If the driver supports any scan IEs, then assume the 822 * limit includes the IEs mac80211 will add, otherwise 823 * leave it at zero and let the driver sort it out; we 824 * still pass our IEs to the driver but userspace will 825 * not be allowed to in that case. 826 */ 827 if (local->hw.wiphy->max_scan_ie_len) 828 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 829 830 /* Set up cipher suites unless driver already did */ 831 if (!local->hw.wiphy->cipher_suites) { 832 local->hw.wiphy->cipher_suites = cipher_suites; 833 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 834 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) 835 local->hw.wiphy->n_cipher_suites--; 836 } 837 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) { 838 if (local->hw.wiphy->cipher_suites == cipher_suites) { 839 local->hw.wiphy->cipher_suites += 2; 840 local->hw.wiphy->n_cipher_suites -= 2; 841 } else { 842 u32 *suites; 843 int r, w = 0; 844 845 /* Filter out WEP */ 846 847 suites = kmemdup( 848 local->hw.wiphy->cipher_suites, 849 sizeof(u32) * local->hw.wiphy->n_cipher_suites, 850 GFP_KERNEL); 851 if (!suites) 852 return -ENOMEM; 853 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) { 854 u32 suite = local->hw.wiphy->cipher_suites[r]; 855 if (suite == WLAN_CIPHER_SUITE_WEP40 || 856 suite == WLAN_CIPHER_SUITE_WEP104) 857 continue; 858 suites[w++] = suite; 859 } 860 local->hw.wiphy->cipher_suites = suites; 861 local->hw.wiphy->n_cipher_suites = w; 862 local->wiphy_ciphers_allocated = true; 863 } 864 } 865 866 if (!local->ops->remain_on_channel) 867 local->hw.wiphy->max_remain_on_channel_duration = 5000; 868 869 if (local->ops->sched_scan_start) 870 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN; 871 872 /* mac80211 based drivers don't support internal TDLS setup */ 873 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) 874 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP; 875 876 result = wiphy_register(local->hw.wiphy); 877 if (result < 0) 878 goto fail_wiphy_register; 879 880 /* 881 * We use the number of queues for feature tests (QoS, HT) internally 882 * so restrict them appropriately. 883 */ 884 if (hw->queues > IEEE80211_MAX_QUEUES) 885 hw->queues = IEEE80211_MAX_QUEUES; 886 887 local->workqueue = 888 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0); 889 if (!local->workqueue) { 890 result = -ENOMEM; 891 goto fail_workqueue; 892 } 893 894 /* 895 * The hardware needs headroom for sending the frame, 896 * and we need some headroom for passing the frame to monitor 897 * interfaces, but never both at the same time. 898 */ 899 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 900 IEEE80211_TX_STATUS_HEADROOM); 901 902 debugfs_hw_add(local); 903 904 /* 905 * if the driver doesn't specify a max listen interval we 906 * use 5 which should be a safe default 907 */ 908 if (local->hw.max_listen_interval == 0) 909 local->hw.max_listen_interval = 5; 910 911 local->hw.conf.listen_interval = local->hw.max_listen_interval; 912 913 local->dynamic_ps_forced_timeout = -1; 914 915 result = ieee80211_wep_init(local); 916 if (result < 0) 917 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n", 918 result); 919 920 ieee80211_led_init(local); 921 922 rtnl_lock(); 923 924 result = ieee80211_init_rate_ctrl_alg(local, 925 hw->rate_control_algorithm); 926 if (result < 0) { 927 wiphy_debug(local->hw.wiphy, 928 "Failed to initialize rate control algorithm\n"); 929 goto fail_rate; 930 } 931 932 /* add one default STA interface if supported */ 933 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 934 result = ieee80211_if_add(local, "wlan%d", NULL, 935 NL80211_IFTYPE_STATION, NULL); 936 if (result) 937 wiphy_warn(local->hw.wiphy, 938 "Failed to add default virtual iface\n"); 939 } 940 941 rtnl_unlock(); 942 943 local->network_latency_notifier.notifier_call = 944 ieee80211_max_network_latency; 945 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 946 &local->network_latency_notifier); 947 if (result) { 948 rtnl_lock(); 949 goto fail_pm_qos; 950 } 951 952 #ifdef CONFIG_INET 953 local->ifa_notifier.notifier_call = ieee80211_ifa_changed; 954 result = register_inetaddr_notifier(&local->ifa_notifier); 955 if (result) 956 goto fail_ifa; 957 #endif 958 959 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll, 960 local->hw.napi_weight); 961 962 return 0; 963 964 #ifdef CONFIG_INET 965 fail_ifa: 966 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 967 &local->network_latency_notifier); 968 rtnl_lock(); 969 #endif 970 fail_pm_qos: 971 ieee80211_led_exit(local); 972 ieee80211_remove_interfaces(local); 973 fail_rate: 974 rtnl_unlock(); 975 ieee80211_wep_free(local); 976 sta_info_stop(local); 977 destroy_workqueue(local->workqueue); 978 fail_workqueue: 979 wiphy_unregister(local->hw.wiphy); 980 fail_wiphy_register: 981 if (local->wiphy_ciphers_allocated) 982 kfree(local->hw.wiphy->cipher_suites); 983 kfree(local->int_scan_req); 984 return result; 985 } 986 EXPORT_SYMBOL(ieee80211_register_hw); 987 988 void ieee80211_unregister_hw(struct ieee80211_hw *hw) 989 { 990 struct ieee80211_local *local = hw_to_local(hw); 991 992 tasklet_kill(&local->tx_pending_tasklet); 993 tasklet_kill(&local->tasklet); 994 995 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 996 &local->network_latency_notifier); 997 #ifdef CONFIG_INET 998 unregister_inetaddr_notifier(&local->ifa_notifier); 999 #endif 1000 1001 rtnl_lock(); 1002 1003 /* 1004 * At this point, interface list manipulations are fine 1005 * because the driver cannot be handing us frames any 1006 * more and the tasklet is killed. 1007 */ 1008 ieee80211_remove_interfaces(local); 1009 1010 rtnl_unlock(); 1011 1012 /* 1013 * Now all work items will be gone, but the 1014 * timer might still be armed, so delete it 1015 */ 1016 del_timer_sync(&local->work_timer); 1017 1018 cancel_work_sync(&local->restart_work); 1019 cancel_work_sync(&local->reconfig_filter); 1020 1021 ieee80211_clear_tx_pending(local); 1022 rate_control_deinitialize(local); 1023 1024 if (skb_queue_len(&local->skb_queue) || 1025 skb_queue_len(&local->skb_queue_unreliable)) 1026 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n"); 1027 skb_queue_purge(&local->skb_queue); 1028 skb_queue_purge(&local->skb_queue_unreliable); 1029 skb_queue_purge(&local->rx_skb_queue); 1030 1031 destroy_workqueue(local->workqueue); 1032 wiphy_unregister(local->hw.wiphy); 1033 sta_info_stop(local); 1034 ieee80211_wep_free(local); 1035 ieee80211_led_exit(local); 1036 kfree(local->int_scan_req); 1037 } 1038 EXPORT_SYMBOL(ieee80211_unregister_hw); 1039 1040 static int ieee80211_free_ack_frame(int id, void *p, void *data) 1041 { 1042 WARN_ONCE(1, "Have pending ack frames!\n"); 1043 kfree_skb(p); 1044 return 0; 1045 } 1046 1047 void ieee80211_free_hw(struct ieee80211_hw *hw) 1048 { 1049 struct ieee80211_local *local = hw_to_local(hw); 1050 1051 mutex_destroy(&local->iflist_mtx); 1052 mutex_destroy(&local->mtx); 1053 1054 if (local->wiphy_ciphers_allocated) 1055 kfree(local->hw.wiphy->cipher_suites); 1056 1057 idr_for_each(&local->ack_status_frames, 1058 ieee80211_free_ack_frame, NULL); 1059 idr_destroy(&local->ack_status_frames); 1060 1061 wiphy_free(local->hw.wiphy); 1062 } 1063 EXPORT_SYMBOL(ieee80211_free_hw); 1064 1065 static int __init ieee80211_init(void) 1066 { 1067 struct sk_buff *skb; 1068 int ret; 1069 1070 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1071 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1072 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1073 1074 ret = rc80211_minstrel_init(); 1075 if (ret) 1076 return ret; 1077 1078 ret = rc80211_minstrel_ht_init(); 1079 if (ret) 1080 goto err_minstrel; 1081 1082 ret = rc80211_pid_init(); 1083 if (ret) 1084 goto err_pid; 1085 1086 ret = ieee80211_iface_init(); 1087 if (ret) 1088 goto err_netdev; 1089 1090 return 0; 1091 err_netdev: 1092 rc80211_pid_exit(); 1093 err_pid: 1094 rc80211_minstrel_ht_exit(); 1095 err_minstrel: 1096 rc80211_minstrel_exit(); 1097 1098 return ret; 1099 } 1100 1101 static void __exit ieee80211_exit(void) 1102 { 1103 rc80211_pid_exit(); 1104 rc80211_minstrel_ht_exit(); 1105 rc80211_minstrel_exit(); 1106 1107 if (mesh_allocated) 1108 ieee80211s_stop(); 1109 1110 ieee80211_iface_exit(); 1111 1112 rcu_barrier(); 1113 } 1114 1115 1116 subsys_initcall(ieee80211_init); 1117 module_exit(ieee80211_exit); 1118 1119 MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1120 MODULE_LICENSE("GPL"); 1121