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 #include <net/addrconf.h> 27 28 #include "ieee80211_i.h" 29 #include "driver-ops.h" 30 #include "rate.h" 31 #include "mesh.h" 32 #include "wep.h" 33 #include "led.h" 34 #include "cfg.h" 35 #include "debugfs.h" 36 37 void ieee80211_configure_filter(struct ieee80211_local *local) 38 { 39 u64 mc; 40 unsigned int changed_flags; 41 unsigned int new_flags = 0; 42 43 if (atomic_read(&local->iff_promiscs)) 44 new_flags |= FIF_PROMISC_IN_BSS; 45 46 if (atomic_read(&local->iff_allmultis)) 47 new_flags |= FIF_ALLMULTI; 48 49 if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) || 50 test_bit(SCAN_ONCHANNEL_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 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local) 96 { 97 struct ieee80211_sub_if_data *sdata; 98 struct ieee80211_channel *chan; 99 u32 changed = 0; 100 int power; 101 enum nl80211_channel_type channel_type; 102 u32 offchannel_flag; 103 bool scanning = false; 104 105 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 106 if (local->scan_channel) { 107 chan = local->scan_channel; 108 /* If scanning on oper channel, use whatever channel-type 109 * is currently in use. 110 */ 111 if (chan == local->_oper_channel) 112 channel_type = local->_oper_channel_type; 113 else 114 channel_type = NL80211_CHAN_NO_HT; 115 } else if (local->tmp_channel) { 116 chan = local->tmp_channel; 117 channel_type = NL80211_CHAN_NO_HT; 118 } else { 119 chan = local->_oper_channel; 120 channel_type = local->_oper_channel_type; 121 } 122 123 if (chan != local->_oper_channel || 124 channel_type != local->_oper_channel_type) 125 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL; 126 else 127 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL; 128 129 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 130 131 if (offchannel_flag || chan != local->hw.conf.channel || 132 channel_type != local->hw.conf.channel_type) { 133 local->hw.conf.channel = chan; 134 local->hw.conf.channel_type = channel_type; 135 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 136 } 137 138 if (!conf_is_ht(&local->hw.conf)) { 139 /* 140 * mac80211.h documents that this is only valid 141 * when the channel is set to an HT type, and 142 * that otherwise STATIC is used. 143 */ 144 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC; 145 } else if (local->hw.conf.smps_mode != local->smps_mode) { 146 local->hw.conf.smps_mode = local->smps_mode; 147 changed |= IEEE80211_CONF_CHANGE_SMPS; 148 } 149 150 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 151 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) || 152 test_bit(SCAN_HW_SCANNING, &local->scanning); 153 power = chan->max_power; 154 155 rcu_read_lock(); 156 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 157 if (!rcu_access_pointer(sdata->vif.chanctx_conf)) 158 continue; 159 power = min(power, sdata->vif.bss_conf.txpower); 160 } 161 rcu_read_unlock(); 162 163 if (local->hw.conf.power_level != power) { 164 changed |= IEEE80211_CONF_CHANGE_POWER; 165 local->hw.conf.power_level = power; 166 } 167 168 return changed; 169 } 170 171 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 172 { 173 int ret = 0; 174 175 might_sleep(); 176 177 if (!local->use_chanctx) 178 changed |= ieee80211_hw_conf_chan(local); 179 else 180 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL | 181 IEEE80211_CONF_CHANGE_POWER); 182 183 if (changed && local->open_count) { 184 ret = drv_config(local, changed); 185 /* 186 * Goal: 187 * HW reconfiguration should never fail, the driver has told 188 * us what it can support so it should live up to that promise. 189 * 190 * Current status: 191 * rfkill is not integrated with mac80211 and a 192 * configuration command can thus fail if hardware rfkill 193 * is enabled 194 * 195 * FIXME: integrate rfkill with mac80211 and then add this 196 * WARN_ON() back 197 * 198 */ 199 /* WARN_ON(ret); */ 200 } 201 202 return ret; 203 } 204 205 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 206 u32 changed) 207 { 208 struct ieee80211_local *local = sdata->local; 209 210 if (!changed) 211 return; 212 213 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed); 214 } 215 216 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 217 { 218 sdata->vif.bss_conf.use_cts_prot = false; 219 sdata->vif.bss_conf.use_short_preamble = false; 220 sdata->vif.bss_conf.use_short_slot = false; 221 return BSS_CHANGED_ERP_CTS_PROT | 222 BSS_CHANGED_ERP_PREAMBLE | 223 BSS_CHANGED_ERP_SLOT; 224 } 225 226 static void ieee80211_tasklet_handler(unsigned long data) 227 { 228 struct ieee80211_local *local = (struct ieee80211_local *) data; 229 struct sta_info *sta, *tmp; 230 struct skb_eosp_msg_data *eosp_data; 231 struct sk_buff *skb; 232 233 while ((skb = skb_dequeue(&local->skb_queue)) || 234 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 235 switch (skb->pkt_type) { 236 case IEEE80211_RX_MSG: 237 /* Clear skb->pkt_type in order to not confuse kernel 238 * netstack. */ 239 skb->pkt_type = 0; 240 ieee80211_rx(&local->hw, skb); 241 break; 242 case IEEE80211_TX_STATUS_MSG: 243 skb->pkt_type = 0; 244 ieee80211_tx_status(&local->hw, skb); 245 break; 246 case IEEE80211_EOSP_MSG: 247 eosp_data = (void *)skb->cb; 248 for_each_sta_info(local, eosp_data->sta, sta, tmp) { 249 /* skip wrong virtual interface */ 250 if (memcmp(eosp_data->iface, 251 sta->sdata->vif.addr, ETH_ALEN)) 252 continue; 253 clear_sta_flag(sta, WLAN_STA_SP); 254 break; 255 } 256 dev_kfree_skb(skb); 257 break; 258 default: 259 WARN(1, "mac80211: Packet is of unknown type %d\n", 260 skb->pkt_type); 261 dev_kfree_skb(skb); 262 break; 263 } 264 } 265 } 266 267 static void ieee80211_restart_work(struct work_struct *work) 268 { 269 struct ieee80211_local *local = 270 container_of(work, struct ieee80211_local, restart_work); 271 272 /* wait for scan work complete */ 273 flush_workqueue(local->workqueue); 274 275 mutex_lock(&local->mtx); 276 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) || 277 rcu_dereference_protected(local->sched_scan_sdata, 278 lockdep_is_held(&local->mtx)), 279 "%s called with hardware scan in progress\n", __func__); 280 mutex_unlock(&local->mtx); 281 282 rtnl_lock(); 283 ieee80211_scan_cancel(local); 284 ieee80211_reconfig(local); 285 rtnl_unlock(); 286 } 287 288 void ieee80211_restart_hw(struct ieee80211_hw *hw) 289 { 290 struct ieee80211_local *local = hw_to_local(hw); 291 292 trace_api_restart_hw(local); 293 294 wiphy_info(hw->wiphy, 295 "Hardware restart was requested\n"); 296 297 /* use this reason, ieee80211_reconfig will unblock it */ 298 ieee80211_stop_queues_by_reason(hw, 299 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 300 301 /* 302 * Stop all Rx during the reconfig. We don't want state changes 303 * or driver callbacks while this is in progress. 304 */ 305 local->in_reconfig = true; 306 barrier(); 307 308 schedule_work(&local->restart_work); 309 } 310 EXPORT_SYMBOL(ieee80211_restart_hw); 311 312 #ifdef CONFIG_INET 313 static int ieee80211_ifa_changed(struct notifier_block *nb, 314 unsigned long data, void *arg) 315 { 316 struct in_ifaddr *ifa = arg; 317 struct ieee80211_local *local = 318 container_of(nb, struct ieee80211_local, 319 ifa_notifier); 320 struct net_device *ndev = ifa->ifa_dev->dev; 321 struct wireless_dev *wdev = ndev->ieee80211_ptr; 322 struct in_device *idev; 323 struct ieee80211_sub_if_data *sdata; 324 struct ieee80211_bss_conf *bss_conf; 325 struct ieee80211_if_managed *ifmgd; 326 int c = 0; 327 328 /* Make sure it's our interface that got changed */ 329 if (!wdev) 330 return NOTIFY_DONE; 331 332 if (wdev->wiphy != local->hw.wiphy) 333 return NOTIFY_DONE; 334 335 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 336 bss_conf = &sdata->vif.bss_conf; 337 338 /* ARP filtering is only supported in managed mode */ 339 if (sdata->vif.type != NL80211_IFTYPE_STATION) 340 return NOTIFY_DONE; 341 342 idev = __in_dev_get_rtnl(sdata->dev); 343 if (!idev) 344 return NOTIFY_DONE; 345 346 ifmgd = &sdata->u.mgd; 347 mutex_lock(&ifmgd->mtx); 348 349 /* Copy the addresses to the bss_conf list */ 350 ifa = idev->ifa_list; 351 while (ifa) { 352 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN) 353 bss_conf->arp_addr_list[c] = ifa->ifa_address; 354 ifa = ifa->ifa_next; 355 c++; 356 } 357 358 bss_conf->arp_addr_cnt = c; 359 360 /* Configure driver only if associated (which also implies it is up) */ 361 if (ifmgd->associated) 362 ieee80211_bss_info_change_notify(sdata, 363 BSS_CHANGED_ARP_FILTER); 364 365 mutex_unlock(&ifmgd->mtx); 366 367 return NOTIFY_DONE; 368 } 369 #endif 370 371 #if IS_ENABLED(CONFIG_IPV6) 372 static int ieee80211_ifa6_changed(struct notifier_block *nb, 373 unsigned long data, void *arg) 374 { 375 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg; 376 struct inet6_dev *idev = ifa->idev; 377 struct net_device *ndev = ifa->idev->dev; 378 struct ieee80211_local *local = 379 container_of(nb, struct ieee80211_local, ifa6_notifier); 380 struct wireless_dev *wdev = ndev->ieee80211_ptr; 381 struct ieee80211_sub_if_data *sdata; 382 383 /* Make sure it's our interface that got changed */ 384 if (!wdev || wdev->wiphy != local->hw.wiphy) 385 return NOTIFY_DONE; 386 387 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 388 389 /* 390 * For now only support station mode. This is mostly because 391 * doing AP would have to handle AP_VLAN in some way ... 392 */ 393 if (sdata->vif.type != NL80211_IFTYPE_STATION) 394 return NOTIFY_DONE; 395 396 drv_ipv6_addr_change(local, sdata, idev); 397 398 return NOTIFY_DONE; 399 } 400 #endif 401 402 static int ieee80211_napi_poll(struct napi_struct *napi, int budget) 403 { 404 struct ieee80211_local *local = 405 container_of(napi, struct ieee80211_local, napi); 406 407 return local->ops->napi_poll(&local->hw, budget); 408 } 409 410 void ieee80211_napi_schedule(struct ieee80211_hw *hw) 411 { 412 struct ieee80211_local *local = hw_to_local(hw); 413 414 napi_schedule(&local->napi); 415 } 416 EXPORT_SYMBOL(ieee80211_napi_schedule); 417 418 void ieee80211_napi_complete(struct ieee80211_hw *hw) 419 { 420 struct ieee80211_local *local = hw_to_local(hw); 421 422 napi_complete(&local->napi); 423 } 424 EXPORT_SYMBOL(ieee80211_napi_complete); 425 426 /* There isn't a lot of sense in it, but you can transmit anything you like */ 427 static const struct ieee80211_txrx_stypes 428 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = { 429 [NL80211_IFTYPE_ADHOC] = { 430 .tx = 0xffff, 431 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 432 BIT(IEEE80211_STYPE_AUTH >> 4) | 433 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 434 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 435 }, 436 [NL80211_IFTYPE_STATION] = { 437 .tx = 0xffff, 438 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 439 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 440 }, 441 [NL80211_IFTYPE_AP] = { 442 .tx = 0xffff, 443 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 444 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 445 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 446 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 447 BIT(IEEE80211_STYPE_AUTH >> 4) | 448 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 449 BIT(IEEE80211_STYPE_ACTION >> 4), 450 }, 451 [NL80211_IFTYPE_AP_VLAN] = { 452 /* copy AP */ 453 .tx = 0xffff, 454 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 455 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 456 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 457 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 458 BIT(IEEE80211_STYPE_AUTH >> 4) | 459 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 460 BIT(IEEE80211_STYPE_ACTION >> 4), 461 }, 462 [NL80211_IFTYPE_P2P_CLIENT] = { 463 .tx = 0xffff, 464 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 465 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 466 }, 467 [NL80211_IFTYPE_P2P_GO] = { 468 .tx = 0xffff, 469 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 470 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 471 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 472 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 473 BIT(IEEE80211_STYPE_AUTH >> 4) | 474 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 475 BIT(IEEE80211_STYPE_ACTION >> 4), 476 }, 477 [NL80211_IFTYPE_MESH_POINT] = { 478 .tx = 0xffff, 479 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 480 BIT(IEEE80211_STYPE_AUTH >> 4) | 481 BIT(IEEE80211_STYPE_DEAUTH >> 4), 482 }, 483 [NL80211_IFTYPE_P2P_DEVICE] = { 484 .tx = 0xffff, 485 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 486 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 487 }, 488 }; 489 490 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = { 491 .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR | 492 IEEE80211_HT_AMPDU_PARM_DENSITY, 493 494 .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 495 IEEE80211_HT_CAP_MAX_AMSDU | 496 IEEE80211_HT_CAP_SGI_20 | 497 IEEE80211_HT_CAP_SGI_40), 498 .mcs = { 499 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff, 500 0xff, 0xff, 0xff, 0xff, 0xff, }, 501 }, 502 }; 503 504 static const u8 extended_capabilities[] = { 505 0, 0, 0, 0, 0, 0, 0, 506 WLAN_EXT_CAPA8_OPMODE_NOTIF, 507 }; 508 509 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 510 const struct ieee80211_ops *ops) 511 { 512 struct ieee80211_local *local; 513 int priv_size, i; 514 struct wiphy *wiphy; 515 bool use_chanctx; 516 517 if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config || 518 !ops->add_interface || !ops->remove_interface || 519 !ops->configure_filter)) 520 return NULL; 521 522 if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove))) 523 return NULL; 524 525 /* check all or no channel context operations exist */ 526 i = !!ops->add_chanctx + !!ops->remove_chanctx + 527 !!ops->change_chanctx + !!ops->assign_vif_chanctx + 528 !!ops->unassign_vif_chanctx; 529 if (WARN_ON(i != 0 && i != 5)) 530 return NULL; 531 use_chanctx = i == 5; 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; 564 565 wiphy->extended_capabilities = extended_capabilities; 566 wiphy->extended_capabilities_mask = extended_capabilities; 567 wiphy->extended_capabilities_len = ARRAY_SIZE(extended_capabilities); 568 569 if (ops->remain_on_channel) 570 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL; 571 572 wiphy->features |= NL80211_FEATURE_SK_TX_STATUS | 573 NL80211_FEATURE_SAE | 574 NL80211_FEATURE_HT_IBSS | 575 NL80211_FEATURE_VIF_TXPOWER; 576 577 if (!ops->hw_scan) 578 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN | 579 NL80211_FEATURE_AP_SCAN; 580 581 582 if (!ops->set_key) 583 wiphy->flags |= WIPHY_FLAG_IBSS_RSN; 584 585 wiphy->bss_priv_size = sizeof(struct ieee80211_bss); 586 587 local = wiphy_priv(wiphy); 588 589 local->hw.wiphy = wiphy; 590 591 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 592 593 local->ops = ops; 594 local->use_chanctx = use_chanctx; 595 596 /* set up some defaults */ 597 local->hw.queues = 1; 598 local->hw.max_rates = 1; 599 local->hw.max_report_rates = 0; 600 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 601 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 602 local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE; 603 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 604 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 605 local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 606 IEEE80211_RADIOTAP_MCS_HAVE_GI | 607 IEEE80211_RADIOTAP_MCS_HAVE_BW; 608 local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI | 609 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH; 610 local->user_power_level = IEEE80211_UNSET_POWER_LEVEL; 611 wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask; 612 613 INIT_LIST_HEAD(&local->interfaces); 614 615 __hw_addr_init(&local->mc_list); 616 617 mutex_init(&local->iflist_mtx); 618 mutex_init(&local->mtx); 619 620 mutex_init(&local->key_mtx); 621 spin_lock_init(&local->filter_lock); 622 spin_lock_init(&local->rx_path_lock); 623 spin_lock_init(&local->queue_stop_reason_lock); 624 625 INIT_LIST_HEAD(&local->chanctx_list); 626 mutex_init(&local->chanctx_mtx); 627 628 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 629 630 INIT_WORK(&local->restart_work, ieee80211_restart_work); 631 632 INIT_WORK(&local->radar_detected_work, 633 ieee80211_dfs_radar_detected_work); 634 635 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter); 636 local->smps_mode = IEEE80211_SMPS_OFF; 637 638 INIT_WORK(&local->dynamic_ps_enable_work, 639 ieee80211_dynamic_ps_enable_work); 640 INIT_WORK(&local->dynamic_ps_disable_work, 641 ieee80211_dynamic_ps_disable_work); 642 setup_timer(&local->dynamic_ps_timer, 643 ieee80211_dynamic_ps_timer, (unsigned long) local); 644 645 INIT_WORK(&local->sched_scan_stopped_work, 646 ieee80211_sched_scan_stopped_work); 647 648 spin_lock_init(&local->ack_status_lock); 649 idr_init(&local->ack_status_frames); 650 /* preallocate at least one entry */ 651 idr_pre_get(&local->ack_status_frames, GFP_KERNEL); 652 653 sta_info_init(local); 654 655 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 656 skb_queue_head_init(&local->pending[i]); 657 atomic_set(&local->agg_queue_stop[i], 0); 658 } 659 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 660 (unsigned long)local); 661 662 tasklet_init(&local->tasklet, 663 ieee80211_tasklet_handler, 664 (unsigned long) local); 665 666 skb_queue_head_init(&local->skb_queue); 667 skb_queue_head_init(&local->skb_queue_unreliable); 668 669 /* init dummy netdev for use w/ NAPI */ 670 init_dummy_netdev(&local->napi_dev); 671 672 ieee80211_led_names(local); 673 674 ieee80211_roc_setup(local); 675 676 return &local->hw; 677 } 678 EXPORT_SYMBOL(ieee80211_alloc_hw); 679 680 int ieee80211_register_hw(struct ieee80211_hw *hw) 681 { 682 struct ieee80211_local *local = hw_to_local(hw); 683 int result, i; 684 enum ieee80211_band band; 685 int channels, max_bitrates; 686 bool supp_ht, supp_vht; 687 netdev_features_t feature_whitelist; 688 static const u32 cipher_suites[] = { 689 /* keep WEP first, it may be removed below */ 690 WLAN_CIPHER_SUITE_WEP40, 691 WLAN_CIPHER_SUITE_WEP104, 692 WLAN_CIPHER_SUITE_TKIP, 693 WLAN_CIPHER_SUITE_CCMP, 694 695 /* keep last -- depends on hw flags! */ 696 WLAN_CIPHER_SUITE_AES_CMAC 697 }; 698 699 if (hw->flags & IEEE80211_HW_QUEUE_CONTROL && 700 (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE || 701 local->hw.offchannel_tx_hw_queue >= local->hw.queues)) 702 return -EINVAL; 703 704 #ifdef CONFIG_PM 705 if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) && 706 (!local->ops->suspend || !local->ops->resume)) 707 return -EINVAL; 708 #endif 709 710 if (!local->use_chanctx) { 711 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) { 712 const struct ieee80211_iface_combination *comb; 713 714 comb = &local->hw.wiphy->iface_combinations[i]; 715 716 if (comb->num_different_channels > 1) 717 return -EINVAL; 718 } 719 } else { 720 /* 721 * WDS is currently prohibited when channel contexts are used 722 * because there's no clear definition of which channel WDS 723 * type interfaces use 724 */ 725 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)) 726 return -EINVAL; 727 728 /* DFS currently not supported with channel context drivers */ 729 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) { 730 const struct ieee80211_iface_combination *comb; 731 732 comb = &local->hw.wiphy->iface_combinations[i]; 733 734 if (comb->radar_detect_widths) 735 return -EINVAL; 736 } 737 } 738 739 /* Only HW csum features are currently compatible with mac80211 */ 740 feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | 741 NETIF_F_HW_CSUM; 742 if (WARN_ON(hw->netdev_features & ~feature_whitelist)) 743 return -EINVAL; 744 745 if (hw->max_report_rates == 0) 746 hw->max_report_rates = hw->max_rates; 747 748 local->rx_chains = 1; 749 750 /* 751 * generic code guarantees at least one band, 752 * set this very early because much code assumes 753 * that hw.conf.channel is assigned 754 */ 755 channels = 0; 756 max_bitrates = 0; 757 supp_ht = false; 758 supp_vht = false; 759 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 760 struct ieee80211_supported_band *sband; 761 762 sband = local->hw.wiphy->bands[band]; 763 if (!sband) 764 continue; 765 if (!local->use_chanctx && !local->_oper_channel) { 766 /* init channel we're on */ 767 local->hw.conf.channel = 768 local->_oper_channel = &sband->channels[0]; 769 local->hw.conf.channel_type = NL80211_CHAN_NO_HT; 770 } 771 cfg80211_chandef_create(&local->monitor_chandef, 772 &sband->channels[0], 773 NL80211_CHAN_NO_HT); 774 channels += sband->n_channels; 775 776 if (max_bitrates < sband->n_bitrates) 777 max_bitrates = sband->n_bitrates; 778 supp_ht = supp_ht || sband->ht_cap.ht_supported; 779 supp_vht = supp_vht || sband->vht_cap.vht_supported; 780 781 if (sband->ht_cap.ht_supported) 782 local->rx_chains = 783 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs), 784 local->rx_chains); 785 786 /* TODO: consider VHT for RX chains, hopefully it's the same */ 787 } 788 789 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) + 790 sizeof(void *) * channels, GFP_KERNEL); 791 if (!local->int_scan_req) 792 return -ENOMEM; 793 794 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 795 if (!local->hw.wiphy->bands[band]) 796 continue; 797 local->int_scan_req->rates[band] = (u32) -1; 798 } 799 800 /* if low-level driver supports AP, we also support VLAN */ 801 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) { 802 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 803 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN); 804 } 805 806 /* mac80211 always supports monitor */ 807 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 808 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR); 809 810 /* mac80211 doesn't support more than one IBSS interface right now */ 811 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) { 812 const struct ieee80211_iface_combination *c; 813 int j; 814 815 c = &hw->wiphy->iface_combinations[i]; 816 817 for (j = 0; j < c->n_limits; j++) 818 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) && 819 c->limits[j].max > 1) 820 return -EINVAL; 821 } 822 823 #ifndef CONFIG_MAC80211_MESH 824 /* mesh depends on Kconfig, but drivers should set it if they want */ 825 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT); 826 #endif 827 828 /* if the underlying driver supports mesh, mac80211 will (at least) 829 * provide routing of mesh authentication frames to userspace */ 830 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT)) 831 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH; 832 833 /* mac80211 supports control port protocol changing */ 834 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL; 835 836 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 837 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 838 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 839 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 840 841 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) 842 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK), 843 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"); 844 845 /* 846 * Calculate scan IE length -- we need this to alloc 847 * memory and to subtract from the driver limit. It 848 * includes the DS Params, (extended) supported rates, and HT 849 * information -- SSID is the driver's responsibility. 850 */ 851 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ + 852 3 /* DS Params */; 853 if (supp_ht) 854 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 855 856 if (supp_vht) { 857 local->scan_ies_len += 858 2 + sizeof(struct ieee80211_vht_cap); 859 860 /* 861 * (for now at least), drivers wanting to use VHT must 862 * support channel contexts, as they contain all the 863 * necessary VHT information and the global hw config 864 * doesn't (yet) 865 */ 866 if (WARN_ON(!local->use_chanctx)) { 867 result = -EINVAL; 868 goto fail_wiphy_register; 869 } 870 } 871 872 if (!local->ops->hw_scan) { 873 /* For hw_scan, driver needs to set these up. */ 874 local->hw.wiphy->max_scan_ssids = 4; 875 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 876 } 877 878 /* 879 * If the driver supports any scan IEs, then assume the 880 * limit includes the IEs mac80211 will add, otherwise 881 * leave it at zero and let the driver sort it out; we 882 * still pass our IEs to the driver but userspace will 883 * not be allowed to in that case. 884 */ 885 if (local->hw.wiphy->max_scan_ie_len) 886 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 887 888 /* Set up cipher suites unless driver already did */ 889 if (!local->hw.wiphy->cipher_suites) { 890 local->hw.wiphy->cipher_suites = cipher_suites; 891 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 892 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) 893 local->hw.wiphy->n_cipher_suites--; 894 } 895 if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) { 896 if (local->hw.wiphy->cipher_suites == cipher_suites) { 897 local->hw.wiphy->cipher_suites += 2; 898 local->hw.wiphy->n_cipher_suites -= 2; 899 } else { 900 u32 *suites; 901 int r, w = 0; 902 903 /* Filter out WEP */ 904 905 suites = kmemdup( 906 local->hw.wiphy->cipher_suites, 907 sizeof(u32) * local->hw.wiphy->n_cipher_suites, 908 GFP_KERNEL); 909 if (!suites) { 910 result = -ENOMEM; 911 goto fail_wiphy_register; 912 } 913 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) { 914 u32 suite = local->hw.wiphy->cipher_suites[r]; 915 if (suite == WLAN_CIPHER_SUITE_WEP40 || 916 suite == WLAN_CIPHER_SUITE_WEP104) 917 continue; 918 suites[w++] = suite; 919 } 920 local->hw.wiphy->cipher_suites = suites; 921 local->hw.wiphy->n_cipher_suites = w; 922 local->wiphy_ciphers_allocated = true; 923 } 924 } 925 926 if (!local->ops->remain_on_channel) 927 local->hw.wiphy->max_remain_on_channel_duration = 5000; 928 929 if (local->ops->sched_scan_start) 930 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN; 931 932 /* mac80211 based drivers don't support internal TDLS setup */ 933 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) 934 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP; 935 936 result = wiphy_register(local->hw.wiphy); 937 if (result < 0) 938 goto fail_wiphy_register; 939 940 /* 941 * We use the number of queues for feature tests (QoS, HT) internally 942 * so restrict them appropriately. 943 */ 944 if (hw->queues > IEEE80211_MAX_QUEUES) 945 hw->queues = IEEE80211_MAX_QUEUES; 946 947 local->workqueue = 948 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0); 949 if (!local->workqueue) { 950 result = -ENOMEM; 951 goto fail_workqueue; 952 } 953 954 /* 955 * The hardware needs headroom for sending the frame, 956 * and we need some headroom for passing the frame to monitor 957 * interfaces, but never both at the same time. 958 */ 959 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 960 IEEE80211_TX_STATUS_HEADROOM); 961 962 debugfs_hw_add(local); 963 964 /* 965 * if the driver doesn't specify a max listen interval we 966 * use 5 which should be a safe default 967 */ 968 if (local->hw.max_listen_interval == 0) 969 local->hw.max_listen_interval = 5; 970 971 local->hw.conf.listen_interval = local->hw.max_listen_interval; 972 973 local->dynamic_ps_forced_timeout = -1; 974 975 result = ieee80211_wep_init(local); 976 if (result < 0) 977 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n", 978 result); 979 980 ieee80211_led_init(local); 981 982 rtnl_lock(); 983 984 result = ieee80211_init_rate_ctrl_alg(local, 985 hw->rate_control_algorithm); 986 if (result < 0) { 987 wiphy_debug(local->hw.wiphy, 988 "Failed to initialize rate control algorithm\n"); 989 goto fail_rate; 990 } 991 992 /* add one default STA interface if supported */ 993 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 994 result = ieee80211_if_add(local, "wlan%d", NULL, 995 NL80211_IFTYPE_STATION, NULL); 996 if (result) 997 wiphy_warn(local->hw.wiphy, 998 "Failed to add default virtual iface\n"); 999 } 1000 1001 rtnl_unlock(); 1002 1003 local->network_latency_notifier.notifier_call = 1004 ieee80211_max_network_latency; 1005 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 1006 &local->network_latency_notifier); 1007 if (result) { 1008 rtnl_lock(); 1009 goto fail_pm_qos; 1010 } 1011 1012 #ifdef CONFIG_INET 1013 local->ifa_notifier.notifier_call = ieee80211_ifa_changed; 1014 result = register_inetaddr_notifier(&local->ifa_notifier); 1015 if (result) 1016 goto fail_ifa; 1017 #endif 1018 1019 #if IS_ENABLED(CONFIG_IPV6) 1020 local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed; 1021 result = register_inet6addr_notifier(&local->ifa6_notifier); 1022 if (result) 1023 goto fail_ifa6; 1024 #endif 1025 1026 netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll, 1027 local->hw.napi_weight); 1028 1029 return 0; 1030 1031 #if IS_ENABLED(CONFIG_IPV6) 1032 fail_ifa6: 1033 #ifdef CONFIG_INET 1034 unregister_inetaddr_notifier(&local->ifa_notifier); 1035 #endif 1036 #endif 1037 #if defined(CONFIG_INET) || defined(CONFIG_IPV6) 1038 fail_ifa: 1039 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 1040 &local->network_latency_notifier); 1041 rtnl_lock(); 1042 #endif 1043 fail_pm_qos: 1044 ieee80211_led_exit(local); 1045 ieee80211_remove_interfaces(local); 1046 fail_rate: 1047 rtnl_unlock(); 1048 ieee80211_wep_free(local); 1049 sta_info_stop(local); 1050 destroy_workqueue(local->workqueue); 1051 fail_workqueue: 1052 wiphy_unregister(local->hw.wiphy); 1053 fail_wiphy_register: 1054 if (local->wiphy_ciphers_allocated) 1055 kfree(local->hw.wiphy->cipher_suites); 1056 kfree(local->int_scan_req); 1057 return result; 1058 } 1059 EXPORT_SYMBOL(ieee80211_register_hw); 1060 1061 void ieee80211_unregister_hw(struct ieee80211_hw *hw) 1062 { 1063 struct ieee80211_local *local = hw_to_local(hw); 1064 1065 tasklet_kill(&local->tx_pending_tasklet); 1066 tasklet_kill(&local->tasklet); 1067 1068 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 1069 &local->network_latency_notifier); 1070 #ifdef CONFIG_INET 1071 unregister_inetaddr_notifier(&local->ifa_notifier); 1072 #endif 1073 #if IS_ENABLED(CONFIG_IPV6) 1074 unregister_inet6addr_notifier(&local->ifa6_notifier); 1075 #endif 1076 1077 rtnl_lock(); 1078 1079 /* 1080 * At this point, interface list manipulations are fine 1081 * because the driver cannot be handing us frames any 1082 * more and the tasklet is killed. 1083 */ 1084 ieee80211_remove_interfaces(local); 1085 1086 rtnl_unlock(); 1087 1088 cancel_work_sync(&local->restart_work); 1089 cancel_work_sync(&local->reconfig_filter); 1090 1091 ieee80211_clear_tx_pending(local); 1092 rate_control_deinitialize(local); 1093 1094 if (skb_queue_len(&local->skb_queue) || 1095 skb_queue_len(&local->skb_queue_unreliable)) 1096 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n"); 1097 skb_queue_purge(&local->skb_queue); 1098 skb_queue_purge(&local->skb_queue_unreliable); 1099 1100 destroy_workqueue(local->workqueue); 1101 wiphy_unregister(local->hw.wiphy); 1102 sta_info_stop(local); 1103 ieee80211_wep_free(local); 1104 ieee80211_led_exit(local); 1105 kfree(local->int_scan_req); 1106 } 1107 EXPORT_SYMBOL(ieee80211_unregister_hw); 1108 1109 static int ieee80211_free_ack_frame(int id, void *p, void *data) 1110 { 1111 WARN_ONCE(1, "Have pending ack frames!\n"); 1112 kfree_skb(p); 1113 return 0; 1114 } 1115 1116 void ieee80211_free_hw(struct ieee80211_hw *hw) 1117 { 1118 struct ieee80211_local *local = hw_to_local(hw); 1119 1120 mutex_destroy(&local->iflist_mtx); 1121 mutex_destroy(&local->mtx); 1122 1123 if (local->wiphy_ciphers_allocated) 1124 kfree(local->hw.wiphy->cipher_suites); 1125 1126 idr_for_each(&local->ack_status_frames, 1127 ieee80211_free_ack_frame, NULL); 1128 idr_destroy(&local->ack_status_frames); 1129 1130 wiphy_free(local->hw.wiphy); 1131 } 1132 EXPORT_SYMBOL(ieee80211_free_hw); 1133 1134 static int __init ieee80211_init(void) 1135 { 1136 struct sk_buff *skb; 1137 int ret; 1138 1139 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1140 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1141 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1142 1143 ret = rc80211_minstrel_init(); 1144 if (ret) 1145 return ret; 1146 1147 ret = rc80211_minstrel_ht_init(); 1148 if (ret) 1149 goto err_minstrel; 1150 1151 ret = rc80211_pid_init(); 1152 if (ret) 1153 goto err_pid; 1154 1155 ret = ieee80211_iface_init(); 1156 if (ret) 1157 goto err_netdev; 1158 1159 return 0; 1160 err_netdev: 1161 rc80211_pid_exit(); 1162 err_pid: 1163 rc80211_minstrel_ht_exit(); 1164 err_minstrel: 1165 rc80211_minstrel_exit(); 1166 1167 return ret; 1168 } 1169 1170 static void __exit ieee80211_exit(void) 1171 { 1172 rc80211_pid_exit(); 1173 rc80211_minstrel_ht_exit(); 1174 rc80211_minstrel_exit(); 1175 1176 ieee80211s_stop(); 1177 1178 ieee80211_iface_exit(); 1179 1180 rcu_barrier(); 1181 } 1182 1183 1184 subsys_initcall(ieee80211_init); 1185 module_exit(ieee80211_exit); 1186 1187 MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1188 MODULE_LICENSE("GPL"); 1189