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 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local) 97 { 98 struct ieee80211_sub_if_data *sdata; 99 struct ieee80211_channel *chan; 100 u32 changed = 0; 101 int power; 102 enum nl80211_channel_type channel_type; 103 u32 offchannel_flag; 104 bool scanning = false; 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 = NL80211_CHAN_NO_HT; 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 scanning = 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; 155 156 rcu_read_lock(); 157 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 158 if (!rcu_access_pointer(sdata->vif.chanctx_conf)) 159 continue; 160 power = min(power, sdata->vif.bss_conf.txpower); 161 } 162 rcu_read_unlock(); 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 return changed; 170 } 171 172 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 173 { 174 int ret = 0; 175 176 might_sleep(); 177 178 if (!local->use_chanctx) 179 changed |= ieee80211_hw_conf_chan(local); 180 else 181 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL | 182 IEEE80211_CONF_CHANGE_POWER); 183 184 if (changed && local->open_count) { 185 ret = drv_config(local, changed); 186 /* 187 * Goal: 188 * HW reconfiguration should never fail, the driver has told 189 * us what it can support so it should live up to that promise. 190 * 191 * Current status: 192 * rfkill is not integrated with mac80211 and a 193 * configuration command can thus fail if hardware rfkill 194 * is enabled 195 * 196 * FIXME: integrate rfkill with mac80211 and then add this 197 * WARN_ON() back 198 * 199 */ 200 /* WARN_ON(ret); */ 201 } 202 203 return ret; 204 } 205 206 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 207 u32 changed) 208 { 209 struct ieee80211_local *local = sdata->local; 210 static const u8 zero[ETH_ALEN] = { 0 }; 211 212 if (!changed) 213 return; 214 215 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 216 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 217 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 218 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 219 else if (sdata->vif.type == NL80211_IFTYPE_AP) 220 sdata->vif.bss_conf.bssid = sdata->vif.addr; 221 else if (sdata->vif.type == NL80211_IFTYPE_WDS) 222 sdata->vif.bss_conf.bssid = NULL; 223 else if (ieee80211_vif_is_mesh(&sdata->vif)) { 224 sdata->vif.bss_conf.bssid = zero; 225 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 226 sdata->vif.bss_conf.bssid = sdata->vif.addr; 227 WARN_ONCE(changed & ~(BSS_CHANGED_IDLE), 228 "P2P Device BSS changed %#x", changed); 229 } else { 230 WARN_ON(1); 231 return; 232 } 233 234 switch (sdata->vif.type) { 235 case NL80211_IFTYPE_AP: 236 case NL80211_IFTYPE_ADHOC: 237 case NL80211_IFTYPE_WDS: 238 case NL80211_IFTYPE_MESH_POINT: 239 break; 240 default: 241 /* do not warn to simplify caller in scan.c */ 242 changed &= ~BSS_CHANGED_BEACON_ENABLED; 243 if (WARN_ON(changed & BSS_CHANGED_BEACON)) 244 return; 245 break; 246 } 247 248 if (changed & BSS_CHANGED_BEACON_ENABLED) { 249 if (local->quiescing || !ieee80211_sdata_running(sdata) || 250 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) { 251 sdata->vif.bss_conf.enable_beacon = false; 252 } else { 253 /* 254 * Beacon should be enabled, but AP mode must 255 * check whether there is a beacon configured. 256 */ 257 switch (sdata->vif.type) { 258 case NL80211_IFTYPE_AP: 259 sdata->vif.bss_conf.enable_beacon = 260 !!sdata->u.ap.beacon; 261 break; 262 case NL80211_IFTYPE_ADHOC: 263 sdata->vif.bss_conf.enable_beacon = 264 !!sdata->u.ibss.presp; 265 break; 266 #ifdef CONFIG_MAC80211_MESH 267 case NL80211_IFTYPE_MESH_POINT: 268 sdata->vif.bss_conf.enable_beacon = 269 !!sdata->u.mesh.mesh_id_len; 270 break; 271 #endif 272 default: 273 /* not reached */ 274 WARN_ON(1); 275 break; 276 } 277 } 278 } 279 280 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed); 281 } 282 283 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 284 { 285 sdata->vif.bss_conf.use_cts_prot = false; 286 sdata->vif.bss_conf.use_short_preamble = false; 287 sdata->vif.bss_conf.use_short_slot = false; 288 return BSS_CHANGED_ERP_CTS_PROT | 289 BSS_CHANGED_ERP_PREAMBLE | 290 BSS_CHANGED_ERP_SLOT; 291 } 292 293 static void ieee80211_tasklet_handler(unsigned long data) 294 { 295 struct ieee80211_local *local = (struct ieee80211_local *) data; 296 struct sta_info *sta, *tmp; 297 struct skb_eosp_msg_data *eosp_data; 298 struct sk_buff *skb; 299 300 while ((skb = skb_dequeue(&local->skb_queue)) || 301 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 302 switch (skb->pkt_type) { 303 case IEEE80211_RX_MSG: 304 /* Clear skb->pkt_type in order to not confuse kernel 305 * netstack. */ 306 skb->pkt_type = 0; 307 ieee80211_rx(&local->hw, skb); 308 break; 309 case IEEE80211_TX_STATUS_MSG: 310 skb->pkt_type = 0; 311 ieee80211_tx_status(&local->hw, skb); 312 break; 313 case IEEE80211_EOSP_MSG: 314 eosp_data = (void *)skb->cb; 315 for_each_sta_info(local, eosp_data->sta, sta, tmp) { 316 /* skip wrong virtual interface */ 317 if (memcmp(eosp_data->iface, 318 sta->sdata->vif.addr, ETH_ALEN)) 319 continue; 320 clear_sta_flag(sta, WLAN_STA_SP); 321 break; 322 } 323 dev_kfree_skb(skb); 324 break; 325 default: 326 WARN(1, "mac80211: Packet is of unknown type %d\n", 327 skb->pkt_type); 328 dev_kfree_skb(skb); 329 break; 330 } 331 } 332 } 333 334 static void ieee80211_restart_work(struct work_struct *work) 335 { 336 struct ieee80211_local *local = 337 container_of(work, struct ieee80211_local, restart_work); 338 339 /* wait for scan work complete */ 340 flush_workqueue(local->workqueue); 341 342 mutex_lock(&local->mtx); 343 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) || 344 rcu_dereference_protected(local->sched_scan_sdata, 345 lockdep_is_held(&local->mtx)), 346 "%s called with hardware scan in progress\n", __func__); 347 mutex_unlock(&local->mtx); 348 349 rtnl_lock(); 350 ieee80211_scan_cancel(local); 351 ieee80211_reconfig(local); 352 rtnl_unlock(); 353 } 354 355 void ieee80211_restart_hw(struct ieee80211_hw *hw) 356 { 357 struct ieee80211_local *local = hw_to_local(hw); 358 359 trace_api_restart_hw(local); 360 361 wiphy_info(hw->wiphy, 362 "Hardware restart was requested\n"); 363 364 /* use this reason, ieee80211_reconfig will unblock it */ 365 ieee80211_stop_queues_by_reason(hw, 366 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 367 368 /* 369 * Stop all Rx during the reconfig. We don't want state changes 370 * or driver callbacks while this is in progress. 371 */ 372 local->in_reconfig = true; 373 barrier(); 374 375 schedule_work(&local->restart_work); 376 } 377 EXPORT_SYMBOL(ieee80211_restart_hw); 378 379 #ifdef CONFIG_INET 380 static int ieee80211_ifa_changed(struct notifier_block *nb, 381 unsigned long data, void *arg) 382 { 383 struct in_ifaddr *ifa = arg; 384 struct ieee80211_local *local = 385 container_of(nb, struct ieee80211_local, 386 ifa_notifier); 387 struct net_device *ndev = ifa->ifa_dev->dev; 388 struct wireless_dev *wdev = ndev->ieee80211_ptr; 389 struct in_device *idev; 390 struct ieee80211_sub_if_data *sdata; 391 struct ieee80211_bss_conf *bss_conf; 392 struct ieee80211_if_managed *ifmgd; 393 int c = 0; 394 395 /* Make sure it's our interface that got changed */ 396 if (!wdev) 397 return NOTIFY_DONE; 398 399 if (wdev->wiphy != local->hw.wiphy) 400 return NOTIFY_DONE; 401 402 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 403 bss_conf = &sdata->vif.bss_conf; 404 405 /* ARP filtering is only supported in managed mode */ 406 if (sdata->vif.type != NL80211_IFTYPE_STATION) 407 return NOTIFY_DONE; 408 409 idev = __in_dev_get_rtnl(sdata->dev); 410 if (!idev) 411 return NOTIFY_DONE; 412 413 ifmgd = &sdata->u.mgd; 414 mutex_lock(&ifmgd->mtx); 415 416 /* Copy the addresses to the bss_conf list */ 417 ifa = idev->ifa_list; 418 while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) { 419 bss_conf->arp_addr_list[c] = ifa->ifa_address; 420 ifa = ifa->ifa_next; 421 c++; 422 } 423 424 /* If not all addresses fit the list, disable filtering */ 425 if (ifa) { 426 sdata->arp_filter_state = false; 427 c = 0; 428 } else { 429 sdata->arp_filter_state = true; 430 } 431 bss_conf->arp_addr_cnt = c; 432 433 /* Configure driver only if associated (which also implies it is up) */ 434 if (ifmgd->associated) { 435 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 436 ieee80211_bss_info_change_notify(sdata, 437 BSS_CHANGED_ARP_FILTER); 438 } 439 440 mutex_unlock(&ifmgd->mtx); 441 442 return NOTIFY_DONE; 443 } 444 #endif 445 446 static int ieee80211_napi_poll(struct napi_struct *napi, int budget) 447 { 448 struct ieee80211_local *local = 449 container_of(napi, struct ieee80211_local, napi); 450 451 return local->ops->napi_poll(&local->hw, budget); 452 } 453 454 void ieee80211_napi_schedule(struct ieee80211_hw *hw) 455 { 456 struct ieee80211_local *local = hw_to_local(hw); 457 458 napi_schedule(&local->napi); 459 } 460 EXPORT_SYMBOL(ieee80211_napi_schedule); 461 462 void ieee80211_napi_complete(struct ieee80211_hw *hw) 463 { 464 struct ieee80211_local *local = hw_to_local(hw); 465 466 napi_complete(&local->napi); 467 } 468 EXPORT_SYMBOL(ieee80211_napi_complete); 469 470 /* There isn't a lot of sense in it, but you can transmit anything you like */ 471 static const struct ieee80211_txrx_stypes 472 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = { 473 [NL80211_IFTYPE_ADHOC] = { 474 .tx = 0xffff, 475 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 476 BIT(IEEE80211_STYPE_AUTH >> 4) | 477 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 478 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 479 }, 480 [NL80211_IFTYPE_STATION] = { 481 .tx = 0xffff, 482 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 483 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 484 }, 485 [NL80211_IFTYPE_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_AP_VLAN] = { 496 /* copy AP */ 497 .tx = 0xffff, 498 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 499 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 500 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 501 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 502 BIT(IEEE80211_STYPE_AUTH >> 4) | 503 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 504 BIT(IEEE80211_STYPE_ACTION >> 4), 505 }, 506 [NL80211_IFTYPE_P2P_CLIENT] = { 507 .tx = 0xffff, 508 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 509 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 510 }, 511 [NL80211_IFTYPE_P2P_GO] = { 512 .tx = 0xffff, 513 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 514 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 515 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 516 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 517 BIT(IEEE80211_STYPE_AUTH >> 4) | 518 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 519 BIT(IEEE80211_STYPE_ACTION >> 4), 520 }, 521 [NL80211_IFTYPE_MESH_POINT] = { 522 .tx = 0xffff, 523 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 524 BIT(IEEE80211_STYPE_AUTH >> 4) | 525 BIT(IEEE80211_STYPE_DEAUTH >> 4), 526 }, 527 [NL80211_IFTYPE_P2P_DEVICE] = { 528 .tx = 0xffff, 529 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 530 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 531 }, 532 }; 533 534 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = { 535 .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR | 536 IEEE80211_HT_AMPDU_PARM_DENSITY, 537 538 .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 539 IEEE80211_HT_CAP_MAX_AMSDU | 540 IEEE80211_HT_CAP_SGI_40), 541 .mcs = { 542 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff, 543 0xff, 0xff, 0xff, 0xff, 0xff, }, 544 }, 545 }; 546 547 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 548 const struct ieee80211_ops *ops) 549 { 550 struct ieee80211_local *local; 551 int priv_size, i; 552 struct wiphy *wiphy; 553 bool use_chanctx; 554 555 if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config || 556 !ops->add_interface || !ops->remove_interface || 557 !ops->configure_filter)) 558 return NULL; 559 560 if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove))) 561 return NULL; 562 563 /* check all or no channel context operations exist */ 564 i = !!ops->add_chanctx + !!ops->remove_chanctx + 565 !!ops->change_chanctx + !!ops->assign_vif_chanctx + 566 !!ops->unassign_vif_chanctx; 567 if (WARN_ON(i != 0 && i != 5)) 568 return NULL; 569 use_chanctx = i == 5; 570 571 /* Ensure 32-byte alignment of our private data and hw private data. 572 * We use the wiphy priv data for both our ieee80211_local and for 573 * the driver's private data 574 * 575 * In memory it'll be like this: 576 * 577 * +-------------------------+ 578 * | struct wiphy | 579 * +-------------------------+ 580 * | struct ieee80211_local | 581 * +-------------------------+ 582 * | driver's private data | 583 * +-------------------------+ 584 * 585 */ 586 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; 587 588 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 589 590 if (!wiphy) 591 return NULL; 592 593 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes; 594 595 wiphy->privid = mac80211_wiphy_privid; 596 597 wiphy->flags |= WIPHY_FLAG_NETNS_OK | 598 WIPHY_FLAG_4ADDR_AP | 599 WIPHY_FLAG_4ADDR_STATION | 600 WIPHY_FLAG_REPORTS_OBSS | 601 WIPHY_FLAG_OFFCHAN_TX; 602 603 if (ops->remain_on_channel) 604 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL; 605 606 wiphy->features |= NL80211_FEATURE_SK_TX_STATUS | 607 NL80211_FEATURE_SAE | 608 NL80211_FEATURE_HT_IBSS | 609 NL80211_FEATURE_VIF_TXPOWER; 610 611 if (!ops->hw_scan) 612 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN | 613 NL80211_FEATURE_AP_SCAN; 614 615 616 if (!ops->set_key) 617 wiphy->flags |= WIPHY_FLAG_IBSS_RSN; 618 619 wiphy->bss_priv_size = sizeof(struct ieee80211_bss); 620 621 local = wiphy_priv(wiphy); 622 623 local->hw.wiphy = wiphy; 624 625 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 626 627 local->ops = ops; 628 local->use_chanctx = use_chanctx; 629 630 /* set up some defaults */ 631 local->hw.queues = 1; 632 local->hw.max_rates = 1; 633 local->hw.max_report_rates = 0; 634 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 635 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 636 local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE; 637 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 638 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 639 local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 640 IEEE80211_RADIOTAP_MCS_HAVE_GI | 641 IEEE80211_RADIOTAP_MCS_HAVE_BW; 642 local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI | 643 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH; 644 local->user_power_level = IEEE80211_UNSET_POWER_LEVEL; 645 wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask; 646 647 INIT_LIST_HEAD(&local->interfaces); 648 649 __hw_addr_init(&local->mc_list); 650 651 mutex_init(&local->iflist_mtx); 652 mutex_init(&local->mtx); 653 654 mutex_init(&local->key_mtx); 655 spin_lock_init(&local->filter_lock); 656 spin_lock_init(&local->queue_stop_reason_lock); 657 658 INIT_LIST_HEAD(&local->chanctx_list); 659 mutex_init(&local->chanctx_mtx); 660 661 /* 662 * The rx_skb_queue is only accessed from tasklets, 663 * but other SKB queues are used from within IRQ 664 * context. Therefore, this one needs a different 665 * locking class so our direct, non-irq-safe use of 666 * the queue's lock doesn't throw lockdep warnings. 667 */ 668 skb_queue_head_init_class(&local->rx_skb_queue, 669 &ieee80211_rx_skb_queue_class); 670 671 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 672 673 INIT_WORK(&local->restart_work, ieee80211_restart_work); 674 675 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter); 676 local->smps_mode = IEEE80211_SMPS_OFF; 677 678 INIT_WORK(&local->dynamic_ps_enable_work, 679 ieee80211_dynamic_ps_enable_work); 680 INIT_WORK(&local->dynamic_ps_disable_work, 681 ieee80211_dynamic_ps_disable_work); 682 setup_timer(&local->dynamic_ps_timer, 683 ieee80211_dynamic_ps_timer, (unsigned long) local); 684 685 INIT_WORK(&local->sched_scan_stopped_work, 686 ieee80211_sched_scan_stopped_work); 687 688 spin_lock_init(&local->ack_status_lock); 689 idr_init(&local->ack_status_frames); 690 /* preallocate at least one entry */ 691 idr_pre_get(&local->ack_status_frames, GFP_KERNEL); 692 693 sta_info_init(local); 694 695 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 696 skb_queue_head_init(&local->pending[i]); 697 atomic_set(&local->agg_queue_stop[i], 0); 698 } 699 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 700 (unsigned long)local); 701 702 tasklet_init(&local->tasklet, 703 ieee80211_tasklet_handler, 704 (unsigned long) local); 705 706 skb_queue_head_init(&local->skb_queue); 707 skb_queue_head_init(&local->skb_queue_unreliable); 708 709 /* init dummy netdev for use w/ NAPI */ 710 init_dummy_netdev(&local->napi_dev); 711 712 ieee80211_led_names(local); 713 714 ieee80211_roc_setup(local); 715 716 return &local->hw; 717 } 718 EXPORT_SYMBOL(ieee80211_alloc_hw); 719 720 int ieee80211_register_hw(struct ieee80211_hw *hw) 721 { 722 struct ieee80211_local *local = hw_to_local(hw); 723 int result, i; 724 enum ieee80211_band band; 725 int channels, max_bitrates; 726 bool supp_ht, supp_vht; 727 netdev_features_t feature_whitelist; 728 static const u32 cipher_suites[] = { 729 /* keep WEP first, it may be removed below */ 730 WLAN_CIPHER_SUITE_WEP40, 731 WLAN_CIPHER_SUITE_WEP104, 732 WLAN_CIPHER_SUITE_TKIP, 733 WLAN_CIPHER_SUITE_CCMP, 734 735 /* keep last -- depends on hw flags! */ 736 WLAN_CIPHER_SUITE_AES_CMAC 737 }; 738 739 if (hw->flags & IEEE80211_HW_QUEUE_CONTROL && 740 (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE || 741 local->hw.offchannel_tx_hw_queue >= local->hw.queues)) 742 return -EINVAL; 743 744 #ifdef CONFIG_PM 745 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) && 746 (!local->ops->suspend || !local->ops->resume)) 747 return -EINVAL; 748 #endif 749 750 if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan) 751 return -EINVAL; 752 753 if (!local->use_chanctx) { 754 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) { 755 const struct ieee80211_iface_combination *comb; 756 757 comb = &local->hw.wiphy->iface_combinations[i]; 758 759 if (comb->num_different_channels > 1) 760 return -EINVAL; 761 } 762 } else { 763 /* 764 * WDS is currently prohibited when channel contexts are used 765 * because there's no clear definition of which channel WDS 766 * type interfaces use 767 */ 768 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)) 769 return -EINVAL; 770 } 771 772 /* Only HW csum features are currently compatible with mac80211 */ 773 feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | 774 NETIF_F_HW_CSUM; 775 if (WARN_ON(hw->netdev_features & ~feature_whitelist)) 776 return -EINVAL; 777 778 if (hw->max_report_rates == 0) 779 hw->max_report_rates = hw->max_rates; 780 781 local->rx_chains = 1; 782 783 /* 784 * generic code guarantees at least one band, 785 * set this very early because much code assumes 786 * that hw.conf.channel is assigned 787 */ 788 channels = 0; 789 max_bitrates = 0; 790 supp_ht = false; 791 supp_vht = false; 792 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 793 struct ieee80211_supported_band *sband; 794 795 sband = local->hw.wiphy->bands[band]; 796 if (!sband) 797 continue; 798 if (!local->use_chanctx && !local->_oper_channel) { 799 /* init channel we're on */ 800 local->hw.conf.channel = 801 local->_oper_channel = &sband->channels[0]; 802 local->hw.conf.channel_type = NL80211_CHAN_NO_HT; 803 } 804 cfg80211_chandef_create(&local->monitor_chandef, 805 &sband->channels[0], 806 NL80211_CHAN_NO_HT); 807 channels += sband->n_channels; 808 809 if (max_bitrates < sband->n_bitrates) 810 max_bitrates = sband->n_bitrates; 811 supp_ht = supp_ht || sband->ht_cap.ht_supported; 812 supp_vht = supp_vht || sband->vht_cap.vht_supported; 813 814 if (sband->ht_cap.ht_supported) 815 local->rx_chains = 816 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs), 817 local->rx_chains); 818 819 /* TODO: consider VHT for RX chains, hopefully it's the same */ 820 } 821 822 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) + 823 sizeof(void *) * channels, GFP_KERNEL); 824 if (!local->int_scan_req) 825 return -ENOMEM; 826 827 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 828 if (!local->hw.wiphy->bands[band]) 829 continue; 830 local->int_scan_req->rates[band] = (u32) -1; 831 } 832 833 /* if low-level driver supports AP, we also support VLAN */ 834 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) { 835 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 836 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN); 837 } 838 839 /* mac80211 always supports monitor */ 840 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 841 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR); 842 843 /* mac80211 doesn't support more than one IBSS interface right now */ 844 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) { 845 const struct ieee80211_iface_combination *c; 846 int j; 847 848 c = &hw->wiphy->iface_combinations[i]; 849 850 for (j = 0; j < c->n_limits; j++) 851 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) && 852 c->limits[j].max > 1) 853 return -EINVAL; 854 } 855 856 #ifndef CONFIG_MAC80211_MESH 857 /* mesh depends on Kconfig, but drivers should set it if they want */ 858 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT); 859 #endif 860 861 /* if the underlying driver supports mesh, mac80211 will (at least) 862 * provide routing of mesh authentication frames to userspace */ 863 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT)) 864 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH; 865 866 /* mac80211 supports control port protocol changing */ 867 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL; 868 869 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 870 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 871 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 872 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 873 874 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) 875 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK), 876 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"); 877 878 /* 879 * Calculate scan IE length -- we need this to alloc 880 * memory and to subtract from the driver limit. It 881 * includes the DS Params, (extended) supported rates, and HT 882 * information -- SSID is the driver's responsibility. 883 */ 884 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ + 885 3 /* DS Params */; 886 if (supp_ht) 887 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 888 889 if (supp_vht) { 890 local->scan_ies_len += 891 2 + sizeof(struct ieee80211_vht_cap); 892 893 /* 894 * (for now at least), drivers wanting to use VHT must 895 * support channel contexts, as they contain all the 896 * necessary VHT information and the global hw config 897 * doesn't (yet) 898 */ 899 if (WARN_ON(!local->use_chanctx)) { 900 result = -EINVAL; 901 goto fail_wiphy_register; 902 } 903 } 904 905 if (!local->ops->hw_scan) { 906 /* For hw_scan, driver needs to set these up. */ 907 local->hw.wiphy->max_scan_ssids = 4; 908 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 909 } 910 911 /* 912 * If the driver supports any scan IEs, then assume the 913 * limit includes the IEs mac80211 will add, otherwise 914 * leave it at zero and let the driver sort it out; we 915 * still pass our IEs to the driver but userspace will 916 * not be allowed to in that case. 917 */ 918 if (local->hw.wiphy->max_scan_ie_len) 919 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 920 921 /* Set up cipher suites unless driver already did */ 922 if (!local->hw.wiphy->cipher_suites) { 923 local->hw.wiphy->cipher_suites = cipher_suites; 924 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 925 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) 926 local->hw.wiphy->n_cipher_suites--; 927 } 928 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) { 929 if (local->hw.wiphy->cipher_suites == cipher_suites) { 930 local->hw.wiphy->cipher_suites += 2; 931 local->hw.wiphy->n_cipher_suites -= 2; 932 } else { 933 u32 *suites; 934 int r, w = 0; 935 936 /* Filter out WEP */ 937 938 suites = kmemdup( 939 local->hw.wiphy->cipher_suites, 940 sizeof(u32) * local->hw.wiphy->n_cipher_suites, 941 GFP_KERNEL); 942 if (!suites) { 943 result = -ENOMEM; 944 goto fail_wiphy_register; 945 } 946 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) { 947 u32 suite = local->hw.wiphy->cipher_suites[r]; 948 if (suite == WLAN_CIPHER_SUITE_WEP40 || 949 suite == WLAN_CIPHER_SUITE_WEP104) 950 continue; 951 suites[w++] = suite; 952 } 953 local->hw.wiphy->cipher_suites = suites; 954 local->hw.wiphy->n_cipher_suites = w; 955 local->wiphy_ciphers_allocated = true; 956 } 957 } 958 959 if (!local->ops->remain_on_channel) 960 local->hw.wiphy->max_remain_on_channel_duration = 5000; 961 962 if (local->ops->sched_scan_start) 963 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN; 964 965 /* mac80211 based drivers don't support internal TDLS setup */ 966 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) 967 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP; 968 969 result = wiphy_register(local->hw.wiphy); 970 if (result < 0) 971 goto fail_wiphy_register; 972 973 /* 974 * We use the number of queues for feature tests (QoS, HT) internally 975 * so restrict them appropriately. 976 */ 977 if (hw->queues > IEEE80211_MAX_QUEUES) 978 hw->queues = IEEE80211_MAX_QUEUES; 979 980 local->workqueue = 981 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0); 982 if (!local->workqueue) { 983 result = -ENOMEM; 984 goto fail_workqueue; 985 } 986 987 /* 988 * The hardware needs headroom for sending the frame, 989 * and we need some headroom for passing the frame to monitor 990 * interfaces, but never both at the same time. 991 */ 992 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 993 IEEE80211_TX_STATUS_HEADROOM); 994 995 debugfs_hw_add(local); 996 997 /* 998 * if the driver doesn't specify a max listen interval we 999 * use 5 which should be a safe default 1000 */ 1001 if (local->hw.max_listen_interval == 0) 1002 local->hw.max_listen_interval = 5; 1003 1004 local->hw.conf.listen_interval = local->hw.max_listen_interval; 1005 1006 local->dynamic_ps_forced_timeout = -1; 1007 1008 result = ieee80211_wep_init(local); 1009 if (result < 0) 1010 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n", 1011 result); 1012 1013 ieee80211_led_init(local); 1014 1015 rtnl_lock(); 1016 1017 result = ieee80211_init_rate_ctrl_alg(local, 1018 hw->rate_control_algorithm); 1019 if (result < 0) { 1020 wiphy_debug(local->hw.wiphy, 1021 "Failed to initialize rate control algorithm\n"); 1022 goto fail_rate; 1023 } 1024 1025 /* add one default STA interface if supported */ 1026 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 1027 result = ieee80211_if_add(local, "wlan%d", NULL, 1028 NL80211_IFTYPE_STATION, NULL); 1029 if (result) 1030 wiphy_warn(local->hw.wiphy, 1031 "Failed to add default virtual iface\n"); 1032 } 1033 1034 rtnl_unlock(); 1035 1036 local->network_latency_notifier.notifier_call = 1037 ieee80211_max_network_latency; 1038 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 1039 &local->network_latency_notifier); 1040 if (result) { 1041 rtnl_lock(); 1042 goto fail_pm_qos; 1043 } 1044 1045 #ifdef CONFIG_INET 1046 local->ifa_notifier.notifier_call = ieee80211_ifa_changed; 1047 result = register_inetaddr_notifier(&local->ifa_notifier); 1048 if (result) 1049 goto fail_ifa; 1050 #endif 1051 1052 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll, 1053 local->hw.napi_weight); 1054 1055 return 0; 1056 1057 #ifdef CONFIG_INET 1058 fail_ifa: 1059 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 1060 &local->network_latency_notifier); 1061 rtnl_lock(); 1062 #endif 1063 fail_pm_qos: 1064 ieee80211_led_exit(local); 1065 ieee80211_remove_interfaces(local); 1066 fail_rate: 1067 rtnl_unlock(); 1068 ieee80211_wep_free(local); 1069 sta_info_stop(local); 1070 destroy_workqueue(local->workqueue); 1071 fail_workqueue: 1072 wiphy_unregister(local->hw.wiphy); 1073 fail_wiphy_register: 1074 if (local->wiphy_ciphers_allocated) 1075 kfree(local->hw.wiphy->cipher_suites); 1076 kfree(local->int_scan_req); 1077 return result; 1078 } 1079 EXPORT_SYMBOL(ieee80211_register_hw); 1080 1081 void ieee80211_unregister_hw(struct ieee80211_hw *hw) 1082 { 1083 struct ieee80211_local *local = hw_to_local(hw); 1084 1085 tasklet_kill(&local->tx_pending_tasklet); 1086 tasklet_kill(&local->tasklet); 1087 1088 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 1089 &local->network_latency_notifier); 1090 #ifdef CONFIG_INET 1091 unregister_inetaddr_notifier(&local->ifa_notifier); 1092 #endif 1093 1094 rtnl_lock(); 1095 1096 /* 1097 * At this point, interface list manipulations are fine 1098 * because the driver cannot be handing us frames any 1099 * more and the tasklet is killed. 1100 */ 1101 ieee80211_remove_interfaces(local); 1102 1103 rtnl_unlock(); 1104 1105 cancel_work_sync(&local->restart_work); 1106 cancel_work_sync(&local->reconfig_filter); 1107 1108 ieee80211_clear_tx_pending(local); 1109 rate_control_deinitialize(local); 1110 1111 if (skb_queue_len(&local->skb_queue) || 1112 skb_queue_len(&local->skb_queue_unreliable)) 1113 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n"); 1114 skb_queue_purge(&local->skb_queue); 1115 skb_queue_purge(&local->skb_queue_unreliable); 1116 skb_queue_purge(&local->rx_skb_queue); 1117 1118 destroy_workqueue(local->workqueue); 1119 wiphy_unregister(local->hw.wiphy); 1120 sta_info_stop(local); 1121 ieee80211_wep_free(local); 1122 ieee80211_led_exit(local); 1123 kfree(local->int_scan_req); 1124 } 1125 EXPORT_SYMBOL(ieee80211_unregister_hw); 1126 1127 static int ieee80211_free_ack_frame(int id, void *p, void *data) 1128 { 1129 WARN_ONCE(1, "Have pending ack frames!\n"); 1130 kfree_skb(p); 1131 return 0; 1132 } 1133 1134 void ieee80211_free_hw(struct ieee80211_hw *hw) 1135 { 1136 struct ieee80211_local *local = hw_to_local(hw); 1137 1138 mutex_destroy(&local->iflist_mtx); 1139 mutex_destroy(&local->mtx); 1140 1141 if (local->wiphy_ciphers_allocated) 1142 kfree(local->hw.wiphy->cipher_suites); 1143 1144 idr_for_each(&local->ack_status_frames, 1145 ieee80211_free_ack_frame, NULL); 1146 idr_destroy(&local->ack_status_frames); 1147 1148 wiphy_free(local->hw.wiphy); 1149 } 1150 EXPORT_SYMBOL(ieee80211_free_hw); 1151 1152 static int __init ieee80211_init(void) 1153 { 1154 struct sk_buff *skb; 1155 int ret; 1156 1157 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1158 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1159 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1160 1161 ret = rc80211_minstrel_init(); 1162 if (ret) 1163 return ret; 1164 1165 ret = rc80211_minstrel_ht_init(); 1166 if (ret) 1167 goto err_minstrel; 1168 1169 ret = rc80211_pid_init(); 1170 if (ret) 1171 goto err_pid; 1172 1173 ret = ieee80211_iface_init(); 1174 if (ret) 1175 goto err_netdev; 1176 1177 return 0; 1178 err_netdev: 1179 rc80211_pid_exit(); 1180 err_pid: 1181 rc80211_minstrel_ht_exit(); 1182 err_minstrel: 1183 rc80211_minstrel_exit(); 1184 1185 return ret; 1186 } 1187 1188 static void __exit ieee80211_exit(void) 1189 { 1190 rc80211_pid_exit(); 1191 rc80211_minstrel_ht_exit(); 1192 rc80211_minstrel_exit(); 1193 1194 if (mesh_allocated) 1195 ieee80211s_stop(); 1196 1197 ieee80211_iface_exit(); 1198 1199 rcu_barrier(); 1200 } 1201 1202 1203 subsys_initcall(ieee80211_init); 1204 module_exit(ieee80211_exit); 1205 1206 MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1207 MODULE_LICENSE("GPL"); 1208