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 cfg80211_chan_def chandef = {}; 99 u32 changed = 0; 100 int power; 101 u32 offchannel_flag; 102 103 offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 104 105 if (local->scan_chandef.chan) { 106 chandef = local->scan_chandef; 107 } else if (local->tmp_channel) { 108 chandef.chan = local->tmp_channel; 109 chandef.width = NL80211_CHAN_WIDTH_20_NOHT; 110 chandef.center_freq1 = chandef.chan->center_freq; 111 } else 112 chandef = local->_oper_chandef; 113 114 WARN(!cfg80211_chandef_valid(&chandef), 115 "control:%d MHz width:%d center: %d/%d MHz", 116 chandef.chan->center_freq, chandef.width, 117 chandef.center_freq1, chandef.center_freq2); 118 119 if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef)) 120 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL; 121 else 122 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL; 123 124 offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; 125 126 if (offchannel_flag || 127 !cfg80211_chandef_identical(&local->hw.conf.chandef, 128 &local->_oper_chandef)) { 129 local->hw.conf.chandef = chandef; 130 changed |= IEEE80211_CONF_CHANGE_CHANNEL; 131 } 132 133 if (!conf_is_ht(&local->hw.conf)) { 134 /* 135 * mac80211.h documents that this is only valid 136 * when the channel is set to an HT type, and 137 * that otherwise STATIC is used. 138 */ 139 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC; 140 } else if (local->hw.conf.smps_mode != local->smps_mode) { 141 local->hw.conf.smps_mode = local->smps_mode; 142 changed |= IEEE80211_CONF_CHANGE_SMPS; 143 } 144 145 power = ieee80211_chandef_max_power(&chandef); 146 147 rcu_read_lock(); 148 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 149 if (!rcu_access_pointer(sdata->vif.chanctx_conf)) 150 continue; 151 power = min(power, sdata->vif.bss_conf.txpower); 152 } 153 rcu_read_unlock(); 154 155 if (local->hw.conf.power_level != power) { 156 changed |= IEEE80211_CONF_CHANGE_POWER; 157 local->hw.conf.power_level = power; 158 } 159 160 return changed; 161 } 162 163 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) 164 { 165 int ret = 0; 166 167 might_sleep(); 168 169 if (!local->use_chanctx) 170 changed |= ieee80211_hw_conf_chan(local); 171 else 172 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL | 173 IEEE80211_CONF_CHANGE_POWER); 174 175 if (changed && local->open_count) { 176 ret = drv_config(local, changed); 177 /* 178 * Goal: 179 * HW reconfiguration should never fail, the driver has told 180 * us what it can support so it should live up to that promise. 181 * 182 * Current status: 183 * rfkill is not integrated with mac80211 and a 184 * configuration command can thus fail if hardware rfkill 185 * is enabled 186 * 187 * FIXME: integrate rfkill with mac80211 and then add this 188 * WARN_ON() back 189 * 190 */ 191 /* WARN_ON(ret); */ 192 } 193 194 return ret; 195 } 196 197 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, 198 u32 changed) 199 { 200 struct ieee80211_local *local = sdata->local; 201 202 if (!changed) 203 return; 204 205 drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed); 206 } 207 208 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) 209 { 210 sdata->vif.bss_conf.use_cts_prot = false; 211 sdata->vif.bss_conf.use_short_preamble = false; 212 sdata->vif.bss_conf.use_short_slot = false; 213 return BSS_CHANGED_ERP_CTS_PROT | 214 BSS_CHANGED_ERP_PREAMBLE | 215 BSS_CHANGED_ERP_SLOT; 216 } 217 218 static void ieee80211_tasklet_handler(unsigned long data) 219 { 220 struct ieee80211_local *local = (struct ieee80211_local *) data; 221 struct sk_buff *skb; 222 223 while ((skb = skb_dequeue(&local->skb_queue)) || 224 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 225 switch (skb->pkt_type) { 226 case IEEE80211_RX_MSG: 227 /* Clear skb->pkt_type in order to not confuse kernel 228 * netstack. */ 229 skb->pkt_type = 0; 230 ieee80211_rx(&local->hw, skb); 231 break; 232 case IEEE80211_TX_STATUS_MSG: 233 skb->pkt_type = 0; 234 ieee80211_tx_status(&local->hw, skb); 235 break; 236 default: 237 WARN(1, "mac80211: Packet is of unknown type %d\n", 238 skb->pkt_type); 239 dev_kfree_skb(skb); 240 break; 241 } 242 } 243 } 244 245 static void ieee80211_restart_work(struct work_struct *work) 246 { 247 struct ieee80211_local *local = 248 container_of(work, struct ieee80211_local, restart_work); 249 250 /* wait for scan work complete */ 251 flush_workqueue(local->workqueue); 252 253 WARN(test_bit(SCAN_HW_SCANNING, &local->scanning), 254 "%s called with hardware scan in progress\n", __func__); 255 256 rtnl_lock(); 257 ieee80211_scan_cancel(local); 258 ieee80211_reconfig(local); 259 rtnl_unlock(); 260 } 261 262 void ieee80211_restart_hw(struct ieee80211_hw *hw) 263 { 264 struct ieee80211_local *local = hw_to_local(hw); 265 266 trace_api_restart_hw(local); 267 268 wiphy_info(hw->wiphy, 269 "Hardware restart was requested\n"); 270 271 /* use this reason, ieee80211_reconfig will unblock it */ 272 ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP, 273 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 274 275 /* 276 * Stop all Rx during the reconfig. We don't want state changes 277 * or driver callbacks while this is in progress. 278 */ 279 local->in_reconfig = true; 280 barrier(); 281 282 schedule_work(&local->restart_work); 283 } 284 EXPORT_SYMBOL(ieee80211_restart_hw); 285 286 #ifdef CONFIG_INET 287 static int ieee80211_ifa_changed(struct notifier_block *nb, 288 unsigned long data, void *arg) 289 { 290 struct in_ifaddr *ifa = arg; 291 struct ieee80211_local *local = 292 container_of(nb, struct ieee80211_local, 293 ifa_notifier); 294 struct net_device *ndev = ifa->ifa_dev->dev; 295 struct wireless_dev *wdev = ndev->ieee80211_ptr; 296 struct in_device *idev; 297 struct ieee80211_sub_if_data *sdata; 298 struct ieee80211_bss_conf *bss_conf; 299 struct ieee80211_if_managed *ifmgd; 300 int c = 0; 301 302 /* Make sure it's our interface that got changed */ 303 if (!wdev) 304 return NOTIFY_DONE; 305 306 if (wdev->wiphy != local->hw.wiphy) 307 return NOTIFY_DONE; 308 309 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 310 bss_conf = &sdata->vif.bss_conf; 311 312 /* ARP filtering is only supported in managed mode */ 313 if (sdata->vif.type != NL80211_IFTYPE_STATION) 314 return NOTIFY_DONE; 315 316 idev = __in_dev_get_rtnl(sdata->dev); 317 if (!idev) 318 return NOTIFY_DONE; 319 320 ifmgd = &sdata->u.mgd; 321 sdata_lock(sdata); 322 323 /* Copy the addresses to the bss_conf list */ 324 ifa = idev->ifa_list; 325 while (ifa) { 326 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN) 327 bss_conf->arp_addr_list[c] = ifa->ifa_address; 328 ifa = ifa->ifa_next; 329 c++; 330 } 331 332 bss_conf->arp_addr_cnt = c; 333 334 /* Configure driver only if associated (which also implies it is up) */ 335 if (ifmgd->associated) 336 ieee80211_bss_info_change_notify(sdata, 337 BSS_CHANGED_ARP_FILTER); 338 339 sdata_unlock(sdata); 340 341 return NOTIFY_DONE; 342 } 343 #endif 344 345 #if IS_ENABLED(CONFIG_IPV6) 346 static int ieee80211_ifa6_changed(struct notifier_block *nb, 347 unsigned long data, void *arg) 348 { 349 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg; 350 struct inet6_dev *idev = ifa->idev; 351 struct net_device *ndev = ifa->idev->dev; 352 struct ieee80211_local *local = 353 container_of(nb, struct ieee80211_local, ifa6_notifier); 354 struct wireless_dev *wdev = ndev->ieee80211_ptr; 355 struct ieee80211_sub_if_data *sdata; 356 357 /* Make sure it's our interface that got changed */ 358 if (!wdev || wdev->wiphy != local->hw.wiphy) 359 return NOTIFY_DONE; 360 361 sdata = IEEE80211_DEV_TO_SUB_IF(ndev); 362 363 /* 364 * For now only support station mode. This is mostly because 365 * doing AP would have to handle AP_VLAN in some way ... 366 */ 367 if (sdata->vif.type != NL80211_IFTYPE_STATION) 368 return NOTIFY_DONE; 369 370 drv_ipv6_addr_change(local, sdata, idev); 371 372 return NOTIFY_DONE; 373 } 374 #endif 375 376 /* There isn't a lot of sense in it, but you can transmit anything you like */ 377 static const struct ieee80211_txrx_stypes 378 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = { 379 [NL80211_IFTYPE_ADHOC] = { 380 .tx = 0xffff, 381 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 382 BIT(IEEE80211_STYPE_AUTH >> 4) | 383 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 384 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 385 }, 386 [NL80211_IFTYPE_STATION] = { 387 .tx = 0xffff, 388 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 389 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 390 }, 391 [NL80211_IFTYPE_AP] = { 392 .tx = 0xffff, 393 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 394 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 395 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 396 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 397 BIT(IEEE80211_STYPE_AUTH >> 4) | 398 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 399 BIT(IEEE80211_STYPE_ACTION >> 4), 400 }, 401 [NL80211_IFTYPE_AP_VLAN] = { 402 /* copy AP */ 403 .tx = 0xffff, 404 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 405 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 406 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 407 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 408 BIT(IEEE80211_STYPE_AUTH >> 4) | 409 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 410 BIT(IEEE80211_STYPE_ACTION >> 4), 411 }, 412 [NL80211_IFTYPE_P2P_CLIENT] = { 413 .tx = 0xffff, 414 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 415 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 416 }, 417 [NL80211_IFTYPE_P2P_GO] = { 418 .tx = 0xffff, 419 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | 420 BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | 421 BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | 422 BIT(IEEE80211_STYPE_DISASSOC >> 4) | 423 BIT(IEEE80211_STYPE_AUTH >> 4) | 424 BIT(IEEE80211_STYPE_DEAUTH >> 4) | 425 BIT(IEEE80211_STYPE_ACTION >> 4), 426 }, 427 [NL80211_IFTYPE_MESH_POINT] = { 428 .tx = 0xffff, 429 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 430 BIT(IEEE80211_STYPE_AUTH >> 4) | 431 BIT(IEEE80211_STYPE_DEAUTH >> 4), 432 }, 433 [NL80211_IFTYPE_P2P_DEVICE] = { 434 .tx = 0xffff, 435 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | 436 BIT(IEEE80211_STYPE_PROBE_REQ >> 4), 437 }, 438 }; 439 440 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = { 441 .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR | 442 IEEE80211_HT_AMPDU_PARM_DENSITY, 443 444 .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 445 IEEE80211_HT_CAP_MAX_AMSDU | 446 IEEE80211_HT_CAP_SGI_20 | 447 IEEE80211_HT_CAP_SGI_40), 448 .mcs = { 449 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff, 450 0xff, 0xff, 0xff, 0xff, 0xff, }, 451 }, 452 }; 453 454 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = { 455 .vht_cap_info = 456 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC | 457 IEEE80211_VHT_CAP_SHORT_GI_80 | 458 IEEE80211_VHT_CAP_SHORT_GI_160 | 459 IEEE80211_VHT_CAP_RXSTBC_1 | 460 IEEE80211_VHT_CAP_RXSTBC_2 | 461 IEEE80211_VHT_CAP_RXSTBC_3 | 462 IEEE80211_VHT_CAP_RXSTBC_4 | 463 IEEE80211_VHT_CAP_TXSTBC | 464 IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE | 465 IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE | 466 IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN | 467 IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN | 468 IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK), 469 .supp_mcs = { 470 .rx_mcs_map = cpu_to_le16(~0), 471 .tx_mcs_map = cpu_to_le16(~0), 472 }, 473 }; 474 475 static const u8 extended_capabilities[] = { 476 0, 0, 0, 0, 0, 0, 0, 477 WLAN_EXT_CAPA8_OPMODE_NOTIF, 478 }; 479 480 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, 481 const struct ieee80211_ops *ops) 482 { 483 struct ieee80211_local *local; 484 int priv_size, i; 485 struct wiphy *wiphy; 486 bool use_chanctx; 487 488 if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config || 489 !ops->add_interface || !ops->remove_interface || 490 !ops->configure_filter)) 491 return NULL; 492 493 if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove))) 494 return NULL; 495 496 /* check all or no channel context operations exist */ 497 i = !!ops->add_chanctx + !!ops->remove_chanctx + 498 !!ops->change_chanctx + !!ops->assign_vif_chanctx + 499 !!ops->unassign_vif_chanctx; 500 if (WARN_ON(i != 0 && i != 5)) 501 return NULL; 502 use_chanctx = i == 5; 503 504 /* Ensure 32-byte alignment of our private data and hw private data. 505 * We use the wiphy priv data for both our ieee80211_local and for 506 * the driver's private data 507 * 508 * In memory it'll be like this: 509 * 510 * +-------------------------+ 511 * | struct wiphy | 512 * +-------------------------+ 513 * | struct ieee80211_local | 514 * +-------------------------+ 515 * | driver's private data | 516 * +-------------------------+ 517 * 518 */ 519 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; 520 521 wiphy = wiphy_new(&mac80211_config_ops, priv_size); 522 523 if (!wiphy) 524 return NULL; 525 526 wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes; 527 528 wiphy->privid = mac80211_wiphy_privid; 529 530 wiphy->flags |= WIPHY_FLAG_NETNS_OK | 531 WIPHY_FLAG_4ADDR_AP | 532 WIPHY_FLAG_4ADDR_STATION | 533 WIPHY_FLAG_REPORTS_OBSS | 534 WIPHY_FLAG_OFFCHAN_TX; 535 536 wiphy->extended_capabilities = extended_capabilities; 537 wiphy->extended_capabilities_mask = extended_capabilities; 538 wiphy->extended_capabilities_len = ARRAY_SIZE(extended_capabilities); 539 540 if (ops->remain_on_channel) 541 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL; 542 543 wiphy->features |= NL80211_FEATURE_SK_TX_STATUS | 544 NL80211_FEATURE_SAE | 545 NL80211_FEATURE_HT_IBSS | 546 NL80211_FEATURE_VIF_TXPOWER | 547 NL80211_FEATURE_USERSPACE_MPM; 548 549 if (!ops->hw_scan) 550 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN | 551 NL80211_FEATURE_AP_SCAN; 552 553 554 if (!ops->set_key) 555 wiphy->flags |= WIPHY_FLAG_IBSS_RSN; 556 557 wiphy->bss_priv_size = sizeof(struct ieee80211_bss); 558 559 local = wiphy_priv(wiphy); 560 561 local->hw.wiphy = wiphy; 562 563 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 564 565 local->ops = ops; 566 local->use_chanctx = use_chanctx; 567 568 /* set up some defaults */ 569 local->hw.queues = 1; 570 local->hw.max_rates = 1; 571 local->hw.max_report_rates = 0; 572 local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 573 local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF; 574 local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE; 575 local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; 576 local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; 577 local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 578 IEEE80211_RADIOTAP_MCS_HAVE_GI | 579 IEEE80211_RADIOTAP_MCS_HAVE_BW; 580 local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI | 581 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH; 582 local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES; 583 local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN; 584 local->user_power_level = IEEE80211_UNSET_POWER_LEVEL; 585 wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask; 586 wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask; 587 588 INIT_LIST_HEAD(&local->interfaces); 589 590 __hw_addr_init(&local->mc_list); 591 592 mutex_init(&local->iflist_mtx); 593 mutex_init(&local->mtx); 594 595 mutex_init(&local->key_mtx); 596 spin_lock_init(&local->filter_lock); 597 spin_lock_init(&local->rx_path_lock); 598 spin_lock_init(&local->queue_stop_reason_lock); 599 600 INIT_LIST_HEAD(&local->chanctx_list); 601 mutex_init(&local->chanctx_mtx); 602 603 INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); 604 605 INIT_WORK(&local->restart_work, ieee80211_restart_work); 606 607 INIT_WORK(&local->radar_detected_work, 608 ieee80211_dfs_radar_detected_work); 609 610 INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter); 611 local->smps_mode = IEEE80211_SMPS_OFF; 612 613 INIT_WORK(&local->dynamic_ps_enable_work, 614 ieee80211_dynamic_ps_enable_work); 615 INIT_WORK(&local->dynamic_ps_disable_work, 616 ieee80211_dynamic_ps_disable_work); 617 setup_timer(&local->dynamic_ps_timer, 618 ieee80211_dynamic_ps_timer, (unsigned long) local); 619 620 INIT_WORK(&local->sched_scan_stopped_work, 621 ieee80211_sched_scan_stopped_work); 622 623 spin_lock_init(&local->ack_status_lock); 624 idr_init(&local->ack_status_frames); 625 626 sta_info_init(local); 627 628 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 629 skb_queue_head_init(&local->pending[i]); 630 atomic_set(&local->agg_queue_stop[i], 0); 631 } 632 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, 633 (unsigned long)local); 634 635 tasklet_init(&local->tasklet, 636 ieee80211_tasklet_handler, 637 (unsigned long) local); 638 639 skb_queue_head_init(&local->skb_queue); 640 skb_queue_head_init(&local->skb_queue_unreliable); 641 642 ieee80211_led_names(local); 643 644 ieee80211_roc_setup(local); 645 646 return &local->hw; 647 } 648 EXPORT_SYMBOL(ieee80211_alloc_hw); 649 650 static int ieee80211_init_cipher_suites(struct ieee80211_local *local) 651 { 652 bool have_wep = !(IS_ERR(local->wep_tx_tfm) || 653 IS_ERR(local->wep_rx_tfm)); 654 bool have_mfp = local->hw.flags & IEEE80211_HW_MFP_CAPABLE; 655 const struct ieee80211_cipher_scheme *cs = local->hw.cipher_schemes; 656 int n_suites = 0, r = 0, w = 0; 657 u32 *suites; 658 static const u32 cipher_suites[] = { 659 /* keep WEP first, it may be removed below */ 660 WLAN_CIPHER_SUITE_WEP40, 661 WLAN_CIPHER_SUITE_WEP104, 662 WLAN_CIPHER_SUITE_TKIP, 663 WLAN_CIPHER_SUITE_CCMP, 664 665 /* keep last -- depends on hw flags! */ 666 WLAN_CIPHER_SUITE_AES_CMAC 667 }; 668 669 /* Driver specifies the ciphers, we have nothing to do... */ 670 if (local->hw.wiphy->cipher_suites && have_wep) 671 return 0; 672 673 /* Set up cipher suites if driver relies on mac80211 cipher defs */ 674 if (!local->hw.wiphy->cipher_suites && !cs) { 675 local->hw.wiphy->cipher_suites = cipher_suites; 676 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); 677 678 if (!have_mfp) 679 local->hw.wiphy->n_cipher_suites--; 680 681 if (!have_wep) { 682 local->hw.wiphy->cipher_suites += 2; 683 local->hw.wiphy->n_cipher_suites -= 2; 684 } 685 686 return 0; 687 } 688 689 if (!local->hw.wiphy->cipher_suites) { 690 /* 691 * Driver specifies cipher schemes only 692 * We start counting ciphers defined by schemes, TKIP and CCMP 693 */ 694 n_suites = local->hw.n_cipher_schemes + 2; 695 696 /* check if we have WEP40 and WEP104 */ 697 if (have_wep) 698 n_suites += 2; 699 700 /* check if we have AES_CMAC */ 701 if (have_mfp) 702 n_suites++; 703 704 suites = kmalloc(sizeof(u32) * n_suites, GFP_KERNEL); 705 if (!suites) 706 return -ENOMEM; 707 708 suites[w++] = WLAN_CIPHER_SUITE_CCMP; 709 suites[w++] = WLAN_CIPHER_SUITE_TKIP; 710 711 if (have_wep) { 712 suites[w++] = WLAN_CIPHER_SUITE_WEP40; 713 suites[w++] = WLAN_CIPHER_SUITE_WEP104; 714 } 715 716 if (have_mfp) 717 suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC; 718 719 for (r = 0; r < local->hw.n_cipher_schemes; r++) 720 suites[w++] = cs[r].cipher; 721 } else { 722 /* Driver provides cipher suites, but we need to exclude WEP */ 723 suites = kmemdup(local->hw.wiphy->cipher_suites, 724 sizeof(u32) * local->hw.wiphy->n_cipher_suites, 725 GFP_KERNEL); 726 if (!suites) 727 return -ENOMEM; 728 729 for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) { 730 u32 suite = local->hw.wiphy->cipher_suites[r]; 731 732 if (suite == WLAN_CIPHER_SUITE_WEP40 || 733 suite == WLAN_CIPHER_SUITE_WEP104) 734 continue; 735 suites[w++] = suite; 736 } 737 } 738 739 local->hw.wiphy->cipher_suites = suites; 740 local->hw.wiphy->n_cipher_suites = w; 741 local->wiphy_ciphers_allocated = true; 742 743 return 0; 744 } 745 746 int ieee80211_register_hw(struct ieee80211_hw *hw) 747 { 748 struct ieee80211_local *local = hw_to_local(hw); 749 int result, i; 750 enum ieee80211_band band; 751 int channels, max_bitrates; 752 bool supp_ht, supp_vht; 753 netdev_features_t feature_whitelist; 754 struct cfg80211_chan_def dflt_chandef = {}; 755 756 if (hw->flags & IEEE80211_HW_QUEUE_CONTROL && 757 (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE || 758 local->hw.offchannel_tx_hw_queue >= local->hw.queues)) 759 return -EINVAL; 760 761 #ifdef CONFIG_PM 762 if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume)) 763 return -EINVAL; 764 #endif 765 766 if (!local->use_chanctx) { 767 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) { 768 const struct ieee80211_iface_combination *comb; 769 770 comb = &local->hw.wiphy->iface_combinations[i]; 771 772 if (comb->num_different_channels > 1) 773 return -EINVAL; 774 } 775 } else { 776 /* 777 * WDS is currently prohibited when channel contexts are used 778 * because there's no clear definition of which channel WDS 779 * type interfaces use 780 */ 781 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)) 782 return -EINVAL; 783 784 /* DFS currently not supported with channel context drivers */ 785 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) { 786 const struct ieee80211_iface_combination *comb; 787 788 comb = &local->hw.wiphy->iface_combinations[i]; 789 790 if (comb->radar_detect_widths) 791 return -EINVAL; 792 } 793 } 794 795 /* Only HW csum features are currently compatible with mac80211 */ 796 feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | 797 NETIF_F_HW_CSUM; 798 if (WARN_ON(hw->netdev_features & ~feature_whitelist)) 799 return -EINVAL; 800 801 if (hw->max_report_rates == 0) 802 hw->max_report_rates = hw->max_rates; 803 804 local->rx_chains = 1; 805 806 /* 807 * generic code guarantees at least one band, 808 * set this very early because much code assumes 809 * that hw.conf.channel is assigned 810 */ 811 channels = 0; 812 max_bitrates = 0; 813 supp_ht = false; 814 supp_vht = false; 815 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 816 struct ieee80211_supported_band *sband; 817 818 sband = local->hw.wiphy->bands[band]; 819 if (!sband) 820 continue; 821 822 if (!dflt_chandef.chan) { 823 cfg80211_chandef_create(&dflt_chandef, 824 &sband->channels[0], 825 NL80211_CHAN_NO_HT); 826 /* init channel we're on */ 827 if (!local->use_chanctx && !local->_oper_chandef.chan) { 828 local->hw.conf.chandef = dflt_chandef; 829 local->_oper_chandef = dflt_chandef; 830 } 831 local->monitor_chandef = dflt_chandef; 832 } 833 834 channels += sband->n_channels; 835 836 if (max_bitrates < sband->n_bitrates) 837 max_bitrates = sband->n_bitrates; 838 supp_ht = supp_ht || sband->ht_cap.ht_supported; 839 supp_vht = supp_vht || sband->vht_cap.vht_supported; 840 841 if (sband->ht_cap.ht_supported) 842 local->rx_chains = 843 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs), 844 local->rx_chains); 845 846 /* TODO: consider VHT for RX chains, hopefully it's the same */ 847 } 848 849 /* if low-level driver supports AP, we also support VLAN */ 850 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) { 851 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); 852 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN); 853 } 854 855 /* mac80211 always supports monitor */ 856 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); 857 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR); 858 859 /* mac80211 doesn't support more than one IBSS interface right now */ 860 for (i = 0; i < hw->wiphy->n_iface_combinations; i++) { 861 const struct ieee80211_iface_combination *c; 862 int j; 863 864 c = &hw->wiphy->iface_combinations[i]; 865 866 for (j = 0; j < c->n_limits; j++) 867 if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) && 868 c->limits[j].max > 1) 869 return -EINVAL; 870 } 871 872 local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) + 873 sizeof(void *) * channels, GFP_KERNEL); 874 if (!local->int_scan_req) 875 return -ENOMEM; 876 877 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 878 if (!local->hw.wiphy->bands[band]) 879 continue; 880 local->int_scan_req->rates[band] = (u32) -1; 881 } 882 883 #ifndef CONFIG_MAC80211_MESH 884 /* mesh depends on Kconfig, but drivers should set it if they want */ 885 local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT); 886 #endif 887 888 /* if the underlying driver supports mesh, mac80211 will (at least) 889 * provide routing of mesh authentication frames to userspace */ 890 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT)) 891 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH; 892 893 /* mac80211 supports control port protocol changing */ 894 local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL; 895 896 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 897 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; 898 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 899 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; 900 901 WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) 902 && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK), 903 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"); 904 905 /* 906 * Calculate scan IE length -- we need this to alloc 907 * memory and to subtract from the driver limit. It 908 * includes the DS Params, (extended) supported rates, and HT 909 * information -- SSID is the driver's responsibility. 910 */ 911 local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ + 912 3 /* DS Params */; 913 if (supp_ht) 914 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); 915 916 if (supp_vht) 917 local->scan_ies_len += 918 2 + sizeof(struct ieee80211_vht_cap); 919 920 if (!local->ops->hw_scan) { 921 /* For hw_scan, driver needs to set these up. */ 922 local->hw.wiphy->max_scan_ssids = 4; 923 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; 924 } 925 926 /* 927 * If the driver supports any scan IEs, then assume the 928 * limit includes the IEs mac80211 will add, otherwise 929 * leave it at zero and let the driver sort it out; we 930 * still pass our IEs to the driver but userspace will 931 * not be allowed to in that case. 932 */ 933 if (local->hw.wiphy->max_scan_ie_len) 934 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; 935 936 WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes, 937 local->hw.n_cipher_schemes)); 938 939 result = ieee80211_init_cipher_suites(local); 940 if (result < 0) 941 goto fail_wiphy_register; 942 943 if (!local->ops->remain_on_channel) 944 local->hw.wiphy->max_remain_on_channel_duration = 5000; 945 946 /* mac80211 based drivers don't support internal TDLS setup */ 947 if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) 948 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP; 949 950 result = wiphy_register(local->hw.wiphy); 951 if (result < 0) 952 goto fail_wiphy_register; 953 954 /* 955 * We use the number of queues for feature tests (QoS, HT) internally 956 * so restrict them appropriately. 957 */ 958 if (hw->queues > IEEE80211_MAX_QUEUES) 959 hw->queues = IEEE80211_MAX_QUEUES; 960 961 local->workqueue = 962 alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy)); 963 if (!local->workqueue) { 964 result = -ENOMEM; 965 goto fail_workqueue; 966 } 967 968 /* 969 * The hardware needs headroom for sending the frame, 970 * and we need some headroom for passing the frame to monitor 971 * interfaces, but never both at the same time. 972 */ 973 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, 974 IEEE80211_TX_STATUS_HEADROOM); 975 976 debugfs_hw_add(local); 977 978 /* 979 * if the driver doesn't specify a max listen interval we 980 * use 5 which should be a safe default 981 */ 982 if (local->hw.max_listen_interval == 0) 983 local->hw.max_listen_interval = 5; 984 985 local->hw.conf.listen_interval = local->hw.max_listen_interval; 986 987 local->dynamic_ps_forced_timeout = -1; 988 989 result = ieee80211_wep_init(local); 990 if (result < 0) 991 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n", 992 result); 993 994 local->hw.conf.flags = IEEE80211_CONF_IDLE; 995 996 ieee80211_led_init(local); 997 998 rtnl_lock(); 999 1000 result = ieee80211_init_rate_ctrl_alg(local, 1001 hw->rate_control_algorithm); 1002 if (result < 0) { 1003 wiphy_debug(local->hw.wiphy, 1004 "Failed to initialize rate control algorithm\n"); 1005 goto fail_rate; 1006 } 1007 1008 /* add one default STA interface if supported */ 1009 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { 1010 result = ieee80211_if_add(local, "wlan%d", NULL, 1011 NL80211_IFTYPE_STATION, NULL); 1012 if (result) 1013 wiphy_warn(local->hw.wiphy, 1014 "Failed to add default virtual iface\n"); 1015 } 1016 1017 rtnl_unlock(); 1018 1019 local->network_latency_notifier.notifier_call = 1020 ieee80211_max_network_latency; 1021 result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, 1022 &local->network_latency_notifier); 1023 if (result) { 1024 rtnl_lock(); 1025 goto fail_pm_qos; 1026 } 1027 1028 #ifdef CONFIG_INET 1029 local->ifa_notifier.notifier_call = ieee80211_ifa_changed; 1030 result = register_inetaddr_notifier(&local->ifa_notifier); 1031 if (result) 1032 goto fail_ifa; 1033 #endif 1034 1035 #if IS_ENABLED(CONFIG_IPV6) 1036 local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed; 1037 result = register_inet6addr_notifier(&local->ifa6_notifier); 1038 if (result) 1039 goto fail_ifa6; 1040 #endif 1041 1042 return 0; 1043 1044 #if IS_ENABLED(CONFIG_IPV6) 1045 fail_ifa6: 1046 #ifdef CONFIG_INET 1047 unregister_inetaddr_notifier(&local->ifa_notifier); 1048 #endif 1049 #endif 1050 #if defined(CONFIG_INET) || defined(CONFIG_IPV6) 1051 fail_ifa: 1052 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 1053 &local->network_latency_notifier); 1054 rtnl_lock(); 1055 #endif 1056 fail_pm_qos: 1057 ieee80211_led_exit(local); 1058 ieee80211_remove_interfaces(local); 1059 fail_rate: 1060 rtnl_unlock(); 1061 ieee80211_wep_free(local); 1062 sta_info_stop(local); 1063 destroy_workqueue(local->workqueue); 1064 fail_workqueue: 1065 wiphy_unregister(local->hw.wiphy); 1066 fail_wiphy_register: 1067 if (local->wiphy_ciphers_allocated) 1068 kfree(local->hw.wiphy->cipher_suites); 1069 kfree(local->int_scan_req); 1070 return result; 1071 } 1072 EXPORT_SYMBOL(ieee80211_register_hw); 1073 1074 void ieee80211_unregister_hw(struct ieee80211_hw *hw) 1075 { 1076 struct ieee80211_local *local = hw_to_local(hw); 1077 1078 tasklet_kill(&local->tx_pending_tasklet); 1079 tasklet_kill(&local->tasklet); 1080 1081 pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, 1082 &local->network_latency_notifier); 1083 #ifdef CONFIG_INET 1084 unregister_inetaddr_notifier(&local->ifa_notifier); 1085 #endif 1086 #if IS_ENABLED(CONFIG_IPV6) 1087 unregister_inet6addr_notifier(&local->ifa6_notifier); 1088 #endif 1089 1090 rtnl_lock(); 1091 1092 /* 1093 * At this point, interface list manipulations are fine 1094 * because the driver cannot be handing us frames any 1095 * more and the tasklet is killed. 1096 */ 1097 ieee80211_remove_interfaces(local); 1098 1099 rtnl_unlock(); 1100 1101 cancel_work_sync(&local->restart_work); 1102 cancel_work_sync(&local->reconfig_filter); 1103 flush_work(&local->sched_scan_stopped_work); 1104 1105 ieee80211_clear_tx_pending(local); 1106 rate_control_deinitialize(local); 1107 1108 if (skb_queue_len(&local->skb_queue) || 1109 skb_queue_len(&local->skb_queue_unreliable)) 1110 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n"); 1111 skb_queue_purge(&local->skb_queue); 1112 skb_queue_purge(&local->skb_queue_unreliable); 1113 1114 destroy_workqueue(local->workqueue); 1115 wiphy_unregister(local->hw.wiphy); 1116 sta_info_stop(local); 1117 ieee80211_wep_free(local); 1118 ieee80211_led_exit(local); 1119 kfree(local->int_scan_req); 1120 } 1121 EXPORT_SYMBOL(ieee80211_unregister_hw); 1122 1123 static int ieee80211_free_ack_frame(int id, void *p, void *data) 1124 { 1125 WARN_ONCE(1, "Have pending ack frames!\n"); 1126 kfree_skb(p); 1127 return 0; 1128 } 1129 1130 void ieee80211_free_hw(struct ieee80211_hw *hw) 1131 { 1132 struct ieee80211_local *local = hw_to_local(hw); 1133 1134 mutex_destroy(&local->iflist_mtx); 1135 mutex_destroy(&local->mtx); 1136 1137 if (local->wiphy_ciphers_allocated) 1138 kfree(local->hw.wiphy->cipher_suites); 1139 1140 idr_for_each(&local->ack_status_frames, 1141 ieee80211_free_ack_frame, NULL); 1142 idr_destroy(&local->ack_status_frames); 1143 1144 kfree(rcu_access_pointer(local->tx_latency)); 1145 1146 wiphy_free(local->hw.wiphy); 1147 } 1148 EXPORT_SYMBOL(ieee80211_free_hw); 1149 1150 static int __init ieee80211_init(void) 1151 { 1152 struct sk_buff *skb; 1153 int ret; 1154 1155 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)); 1156 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + 1157 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); 1158 1159 ret = rc80211_minstrel_init(); 1160 if (ret) 1161 return ret; 1162 1163 ret = rc80211_minstrel_ht_init(); 1164 if (ret) 1165 goto err_minstrel; 1166 1167 ret = rc80211_pid_init(); 1168 if (ret) 1169 goto err_pid; 1170 1171 ret = ieee80211_iface_init(); 1172 if (ret) 1173 goto err_netdev; 1174 1175 return 0; 1176 err_netdev: 1177 rc80211_pid_exit(); 1178 err_pid: 1179 rc80211_minstrel_ht_exit(); 1180 err_minstrel: 1181 rc80211_minstrel_exit(); 1182 1183 return ret; 1184 } 1185 1186 static void __exit ieee80211_exit(void) 1187 { 1188 rc80211_pid_exit(); 1189 rc80211_minstrel_ht_exit(); 1190 rc80211_minstrel_exit(); 1191 1192 ieee80211s_stop(); 1193 1194 ieee80211_iface_exit(); 1195 1196 rcu_barrier(); 1197 } 1198 1199 1200 subsys_initcall(ieee80211_init); 1201 module_exit(ieee80211_exit); 1202 1203 MODULE_DESCRIPTION("IEEE 802.11 subsystem"); 1204 MODULE_LICENSE("GPL"); 1205