1 /* 2 * Interface handling 3 * 4 * Copyright 2002-2005, Instant802 Networks, Inc. 5 * Copyright 2005-2006, Devicescape Software, Inc. 6 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> 7 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 #include <linux/slab.h> 14 #include <linux/kernel.h> 15 #include <linux/if_arp.h> 16 #include <linux/netdevice.h> 17 #include <linux/rtnetlink.h> 18 #include <net/mac80211.h> 19 #include <net/ieee80211_radiotap.h> 20 #include "ieee80211_i.h" 21 #include "sta_info.h" 22 #include "debugfs_netdev.h" 23 #include "mesh.h" 24 #include "led.h" 25 #include "driver-ops.h" 26 #include "wme.h" 27 #include "rate.h" 28 29 /** 30 * DOC: Interface list locking 31 * 32 * The interface list in each struct ieee80211_local is protected 33 * three-fold: 34 * 35 * (1) modifications may only be done under the RTNL 36 * (2) modifications and readers are protected against each other by 37 * the iflist_mtx. 38 * (3) modifications are done in an RCU manner so atomic readers 39 * can traverse the list in RCU-safe blocks. 40 * 41 * As a consequence, reads (traversals) of the list can be protected 42 * by either the RTNL, the iflist_mtx or RCU. 43 */ 44 45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata) 46 { 47 struct ieee80211_chanctx_conf *chanctx_conf; 48 int power; 49 50 rcu_read_lock(); 51 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 52 if (!chanctx_conf) { 53 rcu_read_unlock(); 54 return false; 55 } 56 57 power = ieee80211_chandef_max_power(&chanctx_conf->def); 58 rcu_read_unlock(); 59 60 if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL) 61 power = min(power, sdata->user_power_level); 62 63 if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL) 64 power = min(power, sdata->ap_power_level); 65 66 if (power != sdata->vif.bss_conf.txpower) { 67 sdata->vif.bss_conf.txpower = power; 68 ieee80211_hw_config(sdata->local, 0); 69 return true; 70 } 71 72 return false; 73 } 74 75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata) 76 { 77 if (__ieee80211_recalc_txpower(sdata)) 78 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER); 79 } 80 81 static u32 __ieee80211_idle_off(struct ieee80211_local *local) 82 { 83 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 84 return 0; 85 86 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 87 return IEEE80211_CONF_CHANGE_IDLE; 88 } 89 90 static u32 __ieee80211_idle_on(struct ieee80211_local *local) 91 { 92 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 93 return 0; 94 95 ieee80211_flush_queues(local, NULL); 96 97 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 98 return IEEE80211_CONF_CHANGE_IDLE; 99 } 100 101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local, 102 bool force_active) 103 { 104 bool working = false, scanning, active; 105 unsigned int led_trig_start = 0, led_trig_stop = 0; 106 struct ieee80211_roc_work *roc; 107 108 lockdep_assert_held(&local->mtx); 109 110 active = force_active || 111 !list_empty(&local->chanctx_list) || 112 local->monitors; 113 114 if (!local->ops->remain_on_channel) { 115 list_for_each_entry(roc, &local->roc_list, list) { 116 working = true; 117 break; 118 } 119 } 120 121 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 122 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 123 124 if (working || scanning) 125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 126 else 127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 128 129 if (active) 130 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 131 else 132 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 133 134 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 135 136 if (working || scanning || active) 137 return __ieee80211_idle_off(local); 138 return __ieee80211_idle_on(local); 139 } 140 141 u32 ieee80211_idle_off(struct ieee80211_local *local) 142 { 143 return __ieee80211_recalc_idle(local, true); 144 } 145 146 void ieee80211_recalc_idle(struct ieee80211_local *local) 147 { 148 u32 change = __ieee80211_recalc_idle(local, false); 149 if (change) 150 ieee80211_hw_config(local, change); 151 } 152 153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) 154 { 155 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) 156 return -EINVAL; 157 158 dev->mtu = new_mtu; 159 return 0; 160 } 161 162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 163 bool check_dup) 164 { 165 struct ieee80211_local *local = sdata->local; 166 struct ieee80211_sub_if_data *iter; 167 u64 new, mask, tmp; 168 u8 *m; 169 int ret = 0; 170 171 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 172 return 0; 173 174 m = addr; 175 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 176 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 177 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 178 179 m = local->hw.wiphy->addr_mask; 180 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 181 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 182 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 183 184 if (!check_dup) 185 return ret; 186 187 mutex_lock(&local->iflist_mtx); 188 list_for_each_entry(iter, &local->interfaces, list) { 189 if (iter == sdata) 190 continue; 191 192 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 193 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 194 continue; 195 196 m = iter->vif.addr; 197 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 198 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 199 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 200 201 if ((new & ~mask) != (tmp & ~mask)) { 202 ret = -EINVAL; 203 break; 204 } 205 } 206 mutex_unlock(&local->iflist_mtx); 207 208 return ret; 209 } 210 211 static int ieee80211_change_mac(struct net_device *dev, void *addr) 212 { 213 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 214 struct sockaddr *sa = addr; 215 bool check_dup = true; 216 int ret; 217 218 if (ieee80211_sdata_running(sdata)) 219 return -EBUSY; 220 221 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 222 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 223 check_dup = false; 224 225 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 226 if (ret) 227 return ret; 228 229 ret = eth_mac_addr(dev, sa); 230 231 if (ret == 0) 232 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 233 234 return ret; 235 } 236 237 static inline int identical_mac_addr_allowed(int type1, int type2) 238 { 239 return type1 == NL80211_IFTYPE_MONITOR || 240 type2 == NL80211_IFTYPE_MONITOR || 241 type1 == NL80211_IFTYPE_P2P_DEVICE || 242 type2 == NL80211_IFTYPE_P2P_DEVICE || 243 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || 244 (type1 == NL80211_IFTYPE_WDS && 245 (type2 == NL80211_IFTYPE_WDS || 246 type2 == NL80211_IFTYPE_AP)) || 247 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 248 (type1 == NL80211_IFTYPE_AP_VLAN && 249 (type2 == NL80211_IFTYPE_AP || 250 type2 == NL80211_IFTYPE_AP_VLAN)); 251 } 252 253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 254 enum nl80211_iftype iftype) 255 { 256 struct ieee80211_local *local = sdata->local; 257 struct ieee80211_sub_if_data *nsdata; 258 259 ASSERT_RTNL(); 260 261 /* we hold the RTNL here so can safely walk the list */ 262 list_for_each_entry(nsdata, &local->interfaces, list) { 263 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 264 /* 265 * Allow only a single IBSS interface to be up at any 266 * time. This is restricted because beacon distribution 267 * cannot work properly if both are in the same IBSS. 268 * 269 * To remove this restriction we'd have to disallow them 270 * from setting the same SSID on different IBSS interfaces 271 * belonging to the same hardware. Then, however, we're 272 * faced with having to adopt two different TSF timers... 273 */ 274 if (iftype == NL80211_IFTYPE_ADHOC && 275 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 276 return -EBUSY; 277 /* 278 * will not add another interface while any channel 279 * switch is active. 280 */ 281 if (nsdata->vif.csa_active) 282 return -EBUSY; 283 284 /* 285 * The remaining checks are only performed for interfaces 286 * with the same MAC address. 287 */ 288 if (!ether_addr_equal(sdata->vif.addr, 289 nsdata->vif.addr)) 290 continue; 291 292 /* 293 * check whether it may have the same address 294 */ 295 if (!identical_mac_addr_allowed(iftype, 296 nsdata->vif.type)) 297 return -ENOTUNIQ; 298 299 /* 300 * can only add VLANs to enabled APs 301 */ 302 if (iftype == NL80211_IFTYPE_AP_VLAN && 303 nsdata->vif.type == NL80211_IFTYPE_AP) 304 sdata->bss = &nsdata->u.ap; 305 } 306 } 307 308 return 0; 309 } 310 311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 312 enum nl80211_iftype iftype) 313 { 314 int n_queues = sdata->local->hw.queues; 315 int i; 316 317 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 318 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 319 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 320 IEEE80211_INVAL_HW_QUEUE)) 321 return -EINVAL; 322 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 323 n_queues)) 324 return -EINVAL; 325 } 326 } 327 328 if ((iftype != NL80211_IFTYPE_AP && 329 iftype != NL80211_IFTYPE_P2P_GO && 330 iftype != NL80211_IFTYPE_MESH_POINT) || 331 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) { 332 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 333 return 0; 334 } 335 336 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 337 return -EINVAL; 338 339 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 340 return -EINVAL; 341 342 return 0; 343 } 344 345 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 346 const int offset) 347 { 348 struct ieee80211_local *local = sdata->local; 349 u32 flags = sdata->u.mntr_flags; 350 351 #define ADJUST(_f, _s) do { \ 352 if (flags & MONITOR_FLAG_##_f) \ 353 local->fif_##_s += offset; \ 354 } while (0) 355 356 ADJUST(FCSFAIL, fcsfail); 357 ADJUST(PLCPFAIL, plcpfail); 358 ADJUST(CONTROL, control); 359 ADJUST(CONTROL, pspoll); 360 ADJUST(OTHER_BSS, other_bss); 361 362 #undef ADJUST 363 } 364 365 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 366 { 367 struct ieee80211_local *local = sdata->local; 368 int i; 369 370 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 371 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 372 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 373 else if (local->hw.queues >= IEEE80211_NUM_ACS) 374 sdata->vif.hw_queue[i] = i; 375 else 376 sdata->vif.hw_queue[i] = 0; 377 } 378 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 379 } 380 381 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 382 { 383 struct ieee80211_sub_if_data *sdata; 384 int ret; 385 386 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 387 return 0; 388 389 ASSERT_RTNL(); 390 391 if (local->monitor_sdata) 392 return 0; 393 394 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 395 if (!sdata) 396 return -ENOMEM; 397 398 /* set up data */ 399 sdata->local = local; 400 sdata->vif.type = NL80211_IFTYPE_MONITOR; 401 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 402 wiphy_name(local->hw.wiphy)); 403 404 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 405 406 ieee80211_set_default_queues(sdata); 407 408 ret = drv_add_interface(local, sdata); 409 if (WARN_ON(ret)) { 410 /* ok .. stupid driver, it asked for this! */ 411 kfree(sdata); 412 return ret; 413 } 414 415 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR); 416 if (ret) { 417 kfree(sdata); 418 return ret; 419 } 420 421 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef, 422 IEEE80211_CHANCTX_EXCLUSIVE); 423 if (ret) { 424 drv_remove_interface(local, sdata); 425 kfree(sdata); 426 return ret; 427 } 428 429 mutex_lock(&local->iflist_mtx); 430 rcu_assign_pointer(local->monitor_sdata, sdata); 431 mutex_unlock(&local->iflist_mtx); 432 433 return 0; 434 } 435 436 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 437 { 438 struct ieee80211_sub_if_data *sdata; 439 440 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 441 return; 442 443 ASSERT_RTNL(); 444 445 mutex_lock(&local->iflist_mtx); 446 447 sdata = rcu_dereference_protected(local->monitor_sdata, 448 lockdep_is_held(&local->iflist_mtx)); 449 if (!sdata) { 450 mutex_unlock(&local->iflist_mtx); 451 return; 452 } 453 454 rcu_assign_pointer(local->monitor_sdata, NULL); 455 mutex_unlock(&local->iflist_mtx); 456 457 synchronize_net(); 458 459 ieee80211_vif_release_channel(sdata); 460 461 drv_remove_interface(local, sdata); 462 463 kfree(sdata); 464 } 465 466 /* 467 * NOTE: Be very careful when changing this function, it must NOT return 468 * an error on interface type changes that have been pre-checked, so most 469 * checks should be in ieee80211_check_concurrent_iface. 470 */ 471 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 472 { 473 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 474 struct net_device *dev = wdev->netdev; 475 struct ieee80211_local *local = sdata->local; 476 struct sta_info *sta; 477 u32 changed = 0; 478 int res; 479 u32 hw_reconf_flags = 0; 480 481 switch (sdata->vif.type) { 482 case NL80211_IFTYPE_WDS: 483 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 484 return -ENOLINK; 485 break; 486 case NL80211_IFTYPE_AP_VLAN: { 487 struct ieee80211_sub_if_data *master; 488 489 if (!sdata->bss) 490 return -ENOLINK; 491 492 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 493 494 master = container_of(sdata->bss, 495 struct ieee80211_sub_if_data, u.ap); 496 sdata->control_port_protocol = 497 master->control_port_protocol; 498 sdata->control_port_no_encrypt = 499 master->control_port_no_encrypt; 500 sdata->vif.cab_queue = master->vif.cab_queue; 501 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 502 sizeof(sdata->vif.hw_queue)); 503 break; 504 } 505 case NL80211_IFTYPE_AP: 506 sdata->bss = &sdata->u.ap; 507 break; 508 case NL80211_IFTYPE_MESH_POINT: 509 case NL80211_IFTYPE_STATION: 510 case NL80211_IFTYPE_MONITOR: 511 case NL80211_IFTYPE_ADHOC: 512 case NL80211_IFTYPE_P2P_DEVICE: 513 /* no special treatment */ 514 break; 515 case NL80211_IFTYPE_UNSPECIFIED: 516 case NUM_NL80211_IFTYPES: 517 case NL80211_IFTYPE_P2P_CLIENT: 518 case NL80211_IFTYPE_P2P_GO: 519 /* cannot happen */ 520 WARN_ON(1); 521 break; 522 } 523 524 if (local->open_count == 0) { 525 res = drv_start(local); 526 if (res) 527 goto err_del_bss; 528 /* we're brought up, everything changes */ 529 hw_reconf_flags = ~0; 530 ieee80211_led_radio(local, true); 531 ieee80211_mod_tpt_led_trig(local, 532 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 533 } 534 535 /* 536 * Copy the hopefully now-present MAC address to 537 * this interface, if it has the special null one. 538 */ 539 if (dev && is_zero_ether_addr(dev->dev_addr)) { 540 memcpy(dev->dev_addr, 541 local->hw.wiphy->perm_addr, 542 ETH_ALEN); 543 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 544 545 if (!is_valid_ether_addr(dev->dev_addr)) { 546 res = -EADDRNOTAVAIL; 547 goto err_stop; 548 } 549 } 550 551 switch (sdata->vif.type) { 552 case NL80211_IFTYPE_AP_VLAN: 553 /* no need to tell driver, but set carrier and chanctx */ 554 if (rtnl_dereference(sdata->bss->beacon)) { 555 ieee80211_vif_vlan_copy_chanctx(sdata); 556 netif_carrier_on(dev); 557 } else { 558 netif_carrier_off(dev); 559 } 560 break; 561 case NL80211_IFTYPE_MONITOR: 562 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 563 local->cooked_mntrs++; 564 break; 565 } 566 567 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 568 res = drv_add_interface(local, sdata); 569 if (res) 570 goto err_stop; 571 } else if (local->monitors == 0 && local->open_count == 0) { 572 res = ieee80211_add_virtual_monitor(local); 573 if (res) 574 goto err_stop; 575 } 576 577 /* must be before the call to ieee80211_configure_filter */ 578 local->monitors++; 579 if (local->monitors == 1) { 580 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 581 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 582 } 583 584 ieee80211_adjust_monitor_flags(sdata, 1); 585 ieee80211_configure_filter(local); 586 mutex_lock(&local->mtx); 587 ieee80211_recalc_idle(local); 588 mutex_unlock(&local->mtx); 589 590 netif_carrier_on(dev); 591 break; 592 default: 593 if (coming_up) { 594 ieee80211_del_virtual_monitor(local); 595 596 res = drv_add_interface(local, sdata); 597 if (res) 598 goto err_stop; 599 res = ieee80211_check_queues(sdata, 600 ieee80211_vif_type_p2p(&sdata->vif)); 601 if (res) 602 goto err_del_interface; 603 } 604 605 if (sdata->vif.type == NL80211_IFTYPE_AP) { 606 local->fif_pspoll++; 607 local->fif_probe_req++; 608 609 ieee80211_configure_filter(local); 610 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 611 local->fif_probe_req++; 612 } 613 614 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 615 changed |= ieee80211_reset_erp_info(sdata); 616 ieee80211_bss_info_change_notify(sdata, changed); 617 618 switch (sdata->vif.type) { 619 case NL80211_IFTYPE_STATION: 620 case NL80211_IFTYPE_ADHOC: 621 case NL80211_IFTYPE_AP: 622 case NL80211_IFTYPE_MESH_POINT: 623 netif_carrier_off(dev); 624 break; 625 case NL80211_IFTYPE_WDS: 626 case NL80211_IFTYPE_P2P_DEVICE: 627 break; 628 default: 629 /* not reached */ 630 WARN_ON(1); 631 } 632 633 /* 634 * set default queue parameters so drivers don't 635 * need to initialise the hardware if the hardware 636 * doesn't start up with sane defaults 637 */ 638 ieee80211_set_wmm_default(sdata, true); 639 } 640 641 set_bit(SDATA_STATE_RUNNING, &sdata->state); 642 643 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 644 /* Create STA entry for the WDS peer */ 645 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 646 GFP_KERNEL); 647 if (!sta) { 648 res = -ENOMEM; 649 goto err_del_interface; 650 } 651 652 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 653 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 654 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 655 656 res = sta_info_insert(sta); 657 if (res) { 658 /* STA has been freed */ 659 goto err_del_interface; 660 } 661 662 rate_control_rate_init(sta); 663 netif_carrier_on(dev); 664 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 665 rcu_assign_pointer(local->p2p_sdata, sdata); 666 } 667 668 /* 669 * set_multicast_list will be invoked by the networking core 670 * which will check whether any increments here were done in 671 * error and sync them down to the hardware as filter flags. 672 */ 673 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 674 atomic_inc(&local->iff_allmultis); 675 676 if (sdata->flags & IEEE80211_SDATA_PROMISC) 677 atomic_inc(&local->iff_promiscs); 678 679 if (coming_up) 680 local->open_count++; 681 682 if (hw_reconf_flags) 683 ieee80211_hw_config(local, hw_reconf_flags); 684 685 ieee80211_recalc_ps(local, -1); 686 687 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 688 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 689 /* XXX: for AP_VLAN, actually track AP queues */ 690 netif_tx_start_all_queues(dev); 691 } else if (dev) { 692 unsigned long flags; 693 int n_acs = IEEE80211_NUM_ACS; 694 int ac; 695 696 if (local->hw.queues < IEEE80211_NUM_ACS) 697 n_acs = 1; 698 699 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 700 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE || 701 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 && 702 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) { 703 for (ac = 0; ac < n_acs; ac++) { 704 int ac_queue = sdata->vif.hw_queue[ac]; 705 706 if (local->queue_stop_reasons[ac_queue] == 0 && 707 skb_queue_empty(&local->pending[ac_queue])) 708 netif_start_subqueue(dev, ac); 709 } 710 } 711 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 712 } 713 714 return 0; 715 err_del_interface: 716 drv_remove_interface(local, sdata); 717 err_stop: 718 if (!local->open_count) 719 drv_stop(local); 720 err_del_bss: 721 sdata->bss = NULL; 722 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 723 list_del(&sdata->u.vlan.list); 724 /* might already be clear but that doesn't matter */ 725 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 726 return res; 727 } 728 729 static int ieee80211_open(struct net_device *dev) 730 { 731 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 732 int err; 733 734 /* fail early if user set an invalid address */ 735 if (!is_valid_ether_addr(dev->dev_addr)) 736 return -EADDRNOTAVAIL; 737 738 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 739 if (err) 740 return err; 741 742 return ieee80211_do_open(&sdata->wdev, true); 743 } 744 745 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 746 bool going_down) 747 { 748 struct ieee80211_local *local = sdata->local; 749 unsigned long flags; 750 struct sk_buff *skb, *tmp; 751 u32 hw_reconf_flags = 0; 752 int i, flushed; 753 struct ps_data *ps; 754 struct cfg80211_chan_def chandef; 755 756 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 757 758 if (rcu_access_pointer(local->scan_sdata) == sdata) 759 ieee80211_scan_cancel(local); 760 761 /* 762 * Stop TX on this interface first. 763 */ 764 if (sdata->dev) 765 netif_tx_stop_all_queues(sdata->dev); 766 767 ieee80211_roc_purge(local, sdata); 768 769 if (sdata->vif.type == NL80211_IFTYPE_STATION) 770 ieee80211_mgd_stop(sdata); 771 772 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 773 ieee80211_ibss_stop(sdata); 774 775 776 /* 777 * Remove all stations associated with this interface. 778 * 779 * This must be done before calling ops->remove_interface() 780 * because otherwise we can later invoke ops->sta_notify() 781 * whenever the STAs are removed, and that invalidates driver 782 * assumptions about always getting a vif pointer that is valid 783 * (because if we remove a STA after ops->remove_interface() 784 * the driver will have removed the vif info already!) 785 * 786 * This is relevant only in WDS mode, in all other modes we've 787 * already removed all stations when disconnecting or similar, 788 * so warn otherwise. 789 * 790 * We call sta_info_flush_cleanup() later, to combine RCU waits. 791 */ 792 flushed = sta_info_flush_defer(sdata); 793 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) || 794 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)); 795 796 /* don't count this interface for promisc/allmulti while it is down */ 797 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 798 atomic_dec(&local->iff_allmultis); 799 800 if (sdata->flags & IEEE80211_SDATA_PROMISC) 801 atomic_dec(&local->iff_promiscs); 802 803 if (sdata->vif.type == NL80211_IFTYPE_AP) { 804 local->fif_pspoll--; 805 local->fif_probe_req--; 806 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 807 local->fif_probe_req--; 808 } 809 810 if (sdata->dev) { 811 netif_addr_lock_bh(sdata->dev); 812 spin_lock_bh(&local->filter_lock); 813 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 814 sdata->dev->addr_len); 815 spin_unlock_bh(&local->filter_lock); 816 netif_addr_unlock_bh(sdata->dev); 817 } 818 819 del_timer_sync(&local->dynamic_ps_timer); 820 cancel_work_sync(&local->dynamic_ps_enable_work); 821 822 cancel_work_sync(&sdata->recalc_smps); 823 sdata->vif.csa_active = false; 824 cancel_work_sync(&sdata->csa_finalize_work); 825 826 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); 827 828 if (sdata->wdev.cac_started) { 829 chandef = sdata->vif.bss_conf.chandef; 830 WARN_ON(local->suspended); 831 mutex_lock(&local->iflist_mtx); 832 ieee80211_vif_release_channel(sdata); 833 mutex_unlock(&local->iflist_mtx); 834 cfg80211_cac_event(sdata->dev, &chandef, 835 NL80211_RADAR_CAC_ABORTED, 836 GFP_KERNEL); 837 } 838 839 /* APs need special treatment */ 840 if (sdata->vif.type == NL80211_IFTYPE_AP) { 841 struct ieee80211_sub_if_data *vlan, *tmpsdata; 842 843 /* down all dependent devices, that is VLANs */ 844 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 845 u.vlan.list) 846 dev_close(vlan->dev); 847 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 848 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 849 /* remove all packets in parent bc_buf pointing to this dev */ 850 ps = &sdata->bss->ps; 851 852 spin_lock_irqsave(&ps->bc_buf.lock, flags); 853 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 854 if (skb->dev == sdata->dev) { 855 __skb_unlink(skb, &ps->bc_buf); 856 local->total_ps_buffered--; 857 ieee80211_free_txskb(&local->hw, skb); 858 } 859 } 860 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 861 } 862 863 if (going_down) 864 local->open_count--; 865 866 switch (sdata->vif.type) { 867 case NL80211_IFTYPE_AP_VLAN: 868 list_del(&sdata->u.vlan.list); 869 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL); 870 /* no need to tell driver */ 871 break; 872 case NL80211_IFTYPE_MONITOR: 873 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 874 local->cooked_mntrs--; 875 break; 876 } 877 878 local->monitors--; 879 if (local->monitors == 0) { 880 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 881 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 882 } 883 884 ieee80211_adjust_monitor_flags(sdata, -1); 885 break; 886 case NL80211_IFTYPE_P2P_DEVICE: 887 /* relies on synchronize_rcu() below */ 888 rcu_assign_pointer(local->p2p_sdata, NULL); 889 /* fall through */ 890 default: 891 cancel_work_sync(&sdata->work); 892 /* 893 * When we get here, the interface is marked down. 894 * 895 * sta_info_flush_cleanup() requires rcu_barrier() 896 * first to wait for the station call_rcu() calls 897 * to complete, and we also need synchronize_rcu() 898 * to wait for the RX path in case it is using the 899 * interface and enqueuing frames at this very time on 900 * another CPU. 901 */ 902 synchronize_rcu(); 903 rcu_barrier(); 904 sta_info_flush_cleanup(sdata); 905 906 /* 907 * Free all remaining keys, there shouldn't be any, 908 * except maybe in WDS mode? 909 */ 910 ieee80211_free_keys(sdata); 911 912 /* fall through */ 913 case NL80211_IFTYPE_AP: 914 skb_queue_purge(&sdata->skb_queue); 915 } 916 917 sdata->bss = NULL; 918 919 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 920 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 921 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 922 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 923 if (info->control.vif == &sdata->vif) { 924 __skb_unlink(skb, &local->pending[i]); 925 ieee80211_free_txskb(&local->hw, skb); 926 } 927 } 928 } 929 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 930 931 if (local->open_count == 0) 932 ieee80211_clear_tx_pending(local); 933 934 /* 935 * If the interface goes down while suspended, presumably because 936 * the device was unplugged and that happens before our resume, 937 * then the driver is already unconfigured and the remainder of 938 * this function isn't needed. 939 * XXX: what about WoWLAN? If the device has software state, e.g. 940 * memory allocated, it might expect teardown commands from 941 * mac80211 here? 942 */ 943 if (local->suspended) { 944 WARN_ON(local->wowlan); 945 WARN_ON(rtnl_dereference(local->monitor_sdata)); 946 return; 947 } 948 949 switch (sdata->vif.type) { 950 case NL80211_IFTYPE_AP_VLAN: 951 break; 952 case NL80211_IFTYPE_MONITOR: 953 if (local->monitors == 0) 954 ieee80211_del_virtual_monitor(local); 955 956 mutex_lock(&local->mtx); 957 ieee80211_recalc_idle(local); 958 mutex_unlock(&local->mtx); 959 960 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 961 break; 962 963 /* fall through */ 964 default: 965 if (going_down) 966 drv_remove_interface(local, sdata); 967 } 968 969 ieee80211_recalc_ps(local, -1); 970 971 if (local->open_count == 0) { 972 ieee80211_stop_device(local); 973 974 /* no reconfiguring after stop! */ 975 return; 976 } 977 978 /* do after stop to avoid reconfiguring when we stop anyway */ 979 ieee80211_configure_filter(local); 980 ieee80211_hw_config(local, hw_reconf_flags); 981 982 if (local->monitors == local->open_count) 983 ieee80211_add_virtual_monitor(local); 984 } 985 986 static int ieee80211_stop(struct net_device *dev) 987 { 988 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 989 990 ieee80211_do_stop(sdata, true); 991 992 return 0; 993 } 994 995 static void ieee80211_set_multicast_list(struct net_device *dev) 996 { 997 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 998 struct ieee80211_local *local = sdata->local; 999 int allmulti, promisc, sdata_allmulti, sdata_promisc; 1000 1001 allmulti = !!(dev->flags & IFF_ALLMULTI); 1002 promisc = !!(dev->flags & IFF_PROMISC); 1003 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 1004 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); 1005 1006 if (allmulti != sdata_allmulti) { 1007 if (dev->flags & IFF_ALLMULTI) 1008 atomic_inc(&local->iff_allmultis); 1009 else 1010 atomic_dec(&local->iff_allmultis); 1011 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 1012 } 1013 1014 if (promisc != sdata_promisc) { 1015 if (dev->flags & IFF_PROMISC) 1016 atomic_inc(&local->iff_promiscs); 1017 else 1018 atomic_dec(&local->iff_promiscs); 1019 sdata->flags ^= IEEE80211_SDATA_PROMISC; 1020 } 1021 1022 /* 1023 * TODO: If somebody needs this on AP interfaces, 1024 * it can be enabled easily but multicast 1025 * addresses from VLANs need to be synced. 1026 */ 1027 if (sdata->vif.type != NL80211_IFTYPE_MONITOR && 1028 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 1029 sdata->vif.type != NL80211_IFTYPE_AP) 1030 drv_set_multicast_list(local, sdata, &dev->mc); 1031 1032 spin_lock_bh(&local->filter_lock); 1033 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 1034 spin_unlock_bh(&local->filter_lock); 1035 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 1036 } 1037 1038 /* 1039 * Called when the netdev is removed or, by the code below, before 1040 * the interface type changes. 1041 */ 1042 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1043 { 1044 int i; 1045 1046 /* free extra data */ 1047 ieee80211_free_keys(sdata); 1048 1049 ieee80211_debugfs_remove_netdev(sdata); 1050 1051 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1052 __skb_queue_purge(&sdata->fragments[i].skb_list); 1053 sdata->fragment_next = 0; 1054 1055 if (ieee80211_vif_is_mesh(&sdata->vif)) 1056 mesh_rmc_free(sdata); 1057 } 1058 1059 static void ieee80211_uninit(struct net_device *dev) 1060 { 1061 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 1062 } 1063 1064 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 1065 struct sk_buff *skb) 1066 { 1067 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 1068 } 1069 1070 static const struct net_device_ops ieee80211_dataif_ops = { 1071 .ndo_open = ieee80211_open, 1072 .ndo_stop = ieee80211_stop, 1073 .ndo_uninit = ieee80211_uninit, 1074 .ndo_start_xmit = ieee80211_subif_start_xmit, 1075 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1076 .ndo_change_mtu = ieee80211_change_mtu, 1077 .ndo_set_mac_address = ieee80211_change_mac, 1078 .ndo_select_queue = ieee80211_netdev_select_queue, 1079 }; 1080 1081 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 1082 struct sk_buff *skb) 1083 { 1084 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1085 struct ieee80211_local *local = sdata->local; 1086 struct ieee80211_hdr *hdr; 1087 struct ieee80211_radiotap_header *rtap = (void *)skb->data; 1088 1089 if (local->hw.queues < IEEE80211_NUM_ACS) 1090 return 0; 1091 1092 if (skb->len < 4 || 1093 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) 1094 return 0; /* doesn't matter, frame will be dropped */ 1095 1096 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); 1097 1098 return ieee80211_select_queue_80211(sdata, skb, hdr); 1099 } 1100 1101 static const struct net_device_ops ieee80211_monitorif_ops = { 1102 .ndo_open = ieee80211_open, 1103 .ndo_stop = ieee80211_stop, 1104 .ndo_uninit = ieee80211_uninit, 1105 .ndo_start_xmit = ieee80211_monitor_start_xmit, 1106 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1107 .ndo_change_mtu = ieee80211_change_mtu, 1108 .ndo_set_mac_address = ieee80211_change_mac, 1109 .ndo_select_queue = ieee80211_monitor_select_queue, 1110 }; 1111 1112 static void ieee80211_if_setup(struct net_device *dev) 1113 { 1114 ether_setup(dev); 1115 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1116 dev->netdev_ops = &ieee80211_dataif_ops; 1117 dev->destructor = free_netdev; 1118 } 1119 1120 static void ieee80211_iface_work(struct work_struct *work) 1121 { 1122 struct ieee80211_sub_if_data *sdata = 1123 container_of(work, struct ieee80211_sub_if_data, work); 1124 struct ieee80211_local *local = sdata->local; 1125 struct sk_buff *skb; 1126 struct sta_info *sta; 1127 struct ieee80211_ra_tid *ra_tid; 1128 1129 if (!ieee80211_sdata_running(sdata)) 1130 return; 1131 1132 if (local->scanning) 1133 return; 1134 1135 /* 1136 * ieee80211_queue_work() should have picked up most cases, 1137 * here we'll pick the rest. 1138 */ 1139 if (WARN(local->suspended, 1140 "interface work scheduled while going to suspend\n")) 1141 return; 1142 1143 /* first process frames */ 1144 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1145 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1146 1147 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { 1148 ra_tid = (void *)&skb->cb; 1149 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, 1150 ra_tid->tid); 1151 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { 1152 ra_tid = (void *)&skb->cb; 1153 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, 1154 ra_tid->tid); 1155 } else if (ieee80211_is_action(mgmt->frame_control) && 1156 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1157 int len = skb->len; 1158 1159 mutex_lock(&local->sta_mtx); 1160 sta = sta_info_get_bss(sdata, mgmt->sa); 1161 if (sta) { 1162 switch (mgmt->u.action.u.addba_req.action_code) { 1163 case WLAN_ACTION_ADDBA_REQ: 1164 ieee80211_process_addba_request( 1165 local, sta, mgmt, len); 1166 break; 1167 case WLAN_ACTION_ADDBA_RESP: 1168 ieee80211_process_addba_resp(local, sta, 1169 mgmt, len); 1170 break; 1171 case WLAN_ACTION_DELBA: 1172 ieee80211_process_delba(sdata, sta, 1173 mgmt, len); 1174 break; 1175 default: 1176 WARN_ON(1); 1177 break; 1178 } 1179 } 1180 mutex_unlock(&local->sta_mtx); 1181 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1182 struct ieee80211_hdr *hdr = (void *)mgmt; 1183 /* 1184 * So the frame isn't mgmt, but frame_control 1185 * is at the right place anyway, of course, so 1186 * the if statement is correct. 1187 * 1188 * Warn if we have other data frame types here, 1189 * they must not get here. 1190 */ 1191 WARN_ON(hdr->frame_control & 1192 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1193 WARN_ON(!(hdr->seq_ctrl & 1194 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1195 /* 1196 * This was a fragment of a frame, received while 1197 * a block-ack session was active. That cannot be 1198 * right, so terminate the session. 1199 */ 1200 mutex_lock(&local->sta_mtx); 1201 sta = sta_info_get_bss(sdata, mgmt->sa); 1202 if (sta) { 1203 u16 tid = *ieee80211_get_qos_ctl(hdr) & 1204 IEEE80211_QOS_CTL_TID_MASK; 1205 1206 __ieee80211_stop_rx_ba_session( 1207 sta, tid, WLAN_BACK_RECIPIENT, 1208 WLAN_REASON_QSTA_REQUIRE_SETUP, 1209 true); 1210 } 1211 mutex_unlock(&local->sta_mtx); 1212 } else switch (sdata->vif.type) { 1213 case NL80211_IFTYPE_STATION: 1214 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1215 break; 1216 case NL80211_IFTYPE_ADHOC: 1217 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1218 break; 1219 case NL80211_IFTYPE_MESH_POINT: 1220 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1221 break; 1222 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1223 break; 1224 default: 1225 WARN(1, "frame for unexpected interface type"); 1226 break; 1227 } 1228 1229 kfree_skb(skb); 1230 } 1231 1232 /* then other type-dependent work */ 1233 switch (sdata->vif.type) { 1234 case NL80211_IFTYPE_STATION: 1235 ieee80211_sta_work(sdata); 1236 break; 1237 case NL80211_IFTYPE_ADHOC: 1238 ieee80211_ibss_work(sdata); 1239 break; 1240 case NL80211_IFTYPE_MESH_POINT: 1241 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1242 break; 1243 ieee80211_mesh_work(sdata); 1244 break; 1245 default: 1246 break; 1247 } 1248 } 1249 1250 static void ieee80211_recalc_smps_work(struct work_struct *work) 1251 { 1252 struct ieee80211_sub_if_data *sdata = 1253 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1254 1255 ieee80211_recalc_smps(sdata); 1256 } 1257 1258 /* 1259 * Helper function to initialise an interface to a specific type. 1260 */ 1261 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1262 enum nl80211_iftype type) 1263 { 1264 /* clear type-dependent union */ 1265 memset(&sdata->u, 0, sizeof(sdata->u)); 1266 1267 /* and set some type-dependent values */ 1268 sdata->vif.type = type; 1269 sdata->vif.p2p = false; 1270 sdata->wdev.iftype = type; 1271 1272 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1273 sdata->control_port_no_encrypt = false; 1274 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1275 1276 sdata->noack_map = 0; 1277 1278 /* only monitor/p2p-device differ */ 1279 if (sdata->dev) { 1280 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1281 sdata->dev->type = ARPHRD_ETHER; 1282 } 1283 1284 skb_queue_head_init(&sdata->skb_queue); 1285 INIT_WORK(&sdata->work, ieee80211_iface_work); 1286 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1287 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work); 1288 1289 switch (type) { 1290 case NL80211_IFTYPE_P2P_GO: 1291 type = NL80211_IFTYPE_AP; 1292 sdata->vif.type = type; 1293 sdata->vif.p2p = true; 1294 /* fall through */ 1295 case NL80211_IFTYPE_AP: 1296 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1297 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1298 INIT_WORK(&sdata->u.ap.request_smps_work, 1299 ieee80211_request_smps_ap_work); 1300 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1301 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF; 1302 break; 1303 case NL80211_IFTYPE_P2P_CLIENT: 1304 type = NL80211_IFTYPE_STATION; 1305 sdata->vif.type = type; 1306 sdata->vif.p2p = true; 1307 /* fall through */ 1308 case NL80211_IFTYPE_STATION: 1309 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1310 ieee80211_sta_setup_sdata(sdata); 1311 break; 1312 case NL80211_IFTYPE_ADHOC: 1313 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1314 ieee80211_ibss_setup_sdata(sdata); 1315 break; 1316 case NL80211_IFTYPE_MESH_POINT: 1317 if (ieee80211_vif_is_mesh(&sdata->vif)) 1318 ieee80211_mesh_init_sdata(sdata); 1319 break; 1320 case NL80211_IFTYPE_MONITOR: 1321 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1322 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1323 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 1324 MONITOR_FLAG_OTHER_BSS; 1325 break; 1326 case NL80211_IFTYPE_WDS: 1327 sdata->vif.bss_conf.bssid = NULL; 1328 break; 1329 case NL80211_IFTYPE_AP_VLAN: 1330 case NL80211_IFTYPE_P2P_DEVICE: 1331 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1332 break; 1333 case NL80211_IFTYPE_UNSPECIFIED: 1334 case NUM_NL80211_IFTYPES: 1335 BUG(); 1336 break; 1337 } 1338 1339 ieee80211_debugfs_add_netdev(sdata); 1340 } 1341 1342 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1343 enum nl80211_iftype type) 1344 { 1345 struct ieee80211_local *local = sdata->local; 1346 int ret, err; 1347 enum nl80211_iftype internal_type = type; 1348 bool p2p = false; 1349 1350 ASSERT_RTNL(); 1351 1352 if (!local->ops->change_interface) 1353 return -EBUSY; 1354 1355 switch (sdata->vif.type) { 1356 case NL80211_IFTYPE_AP: 1357 case NL80211_IFTYPE_STATION: 1358 case NL80211_IFTYPE_ADHOC: 1359 /* 1360 * Could maybe also all others here? 1361 * Just not sure how that interacts 1362 * with the RX/config path e.g. for 1363 * mesh. 1364 */ 1365 break; 1366 default: 1367 return -EBUSY; 1368 } 1369 1370 switch (type) { 1371 case NL80211_IFTYPE_AP: 1372 case NL80211_IFTYPE_STATION: 1373 case NL80211_IFTYPE_ADHOC: 1374 /* 1375 * Could probably support everything 1376 * but WDS here (WDS do_open can fail 1377 * under memory pressure, which this 1378 * code isn't prepared to handle). 1379 */ 1380 break; 1381 case NL80211_IFTYPE_P2P_CLIENT: 1382 p2p = true; 1383 internal_type = NL80211_IFTYPE_STATION; 1384 break; 1385 case NL80211_IFTYPE_P2P_GO: 1386 p2p = true; 1387 internal_type = NL80211_IFTYPE_AP; 1388 break; 1389 default: 1390 return -EBUSY; 1391 } 1392 1393 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1394 if (ret) 1395 return ret; 1396 1397 ieee80211_do_stop(sdata, false); 1398 1399 ieee80211_teardown_sdata(sdata); 1400 1401 ret = drv_change_interface(local, sdata, internal_type, p2p); 1402 if (ret) 1403 type = ieee80211_vif_type_p2p(&sdata->vif); 1404 1405 /* 1406 * Ignore return value here, there's not much we can do since 1407 * the driver changed the interface type internally already. 1408 * The warnings will hopefully make driver authors fix it :-) 1409 */ 1410 ieee80211_check_queues(sdata, type); 1411 1412 ieee80211_setup_sdata(sdata, type); 1413 1414 err = ieee80211_do_open(&sdata->wdev, false); 1415 WARN(err, "type change: do_open returned %d", err); 1416 1417 return ret; 1418 } 1419 1420 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1421 enum nl80211_iftype type) 1422 { 1423 int ret; 1424 1425 ASSERT_RTNL(); 1426 1427 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1428 return 0; 1429 1430 if (ieee80211_sdata_running(sdata)) { 1431 ret = ieee80211_runtime_change_iftype(sdata, type); 1432 if (ret) 1433 return ret; 1434 } else { 1435 /* Purge and reset type-dependent state. */ 1436 ieee80211_teardown_sdata(sdata); 1437 ieee80211_setup_sdata(sdata, type); 1438 } 1439 1440 /* reset some values that shouldn't be kept across type changes */ 1441 sdata->drop_unencrypted = 0; 1442 if (type == NL80211_IFTYPE_STATION) 1443 sdata->u.mgd.use_4addr = false; 1444 1445 return 0; 1446 } 1447 1448 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1449 u8 *perm_addr, enum nl80211_iftype type) 1450 { 1451 struct ieee80211_sub_if_data *sdata; 1452 u64 mask, start, addr, val, inc; 1453 u8 *m; 1454 u8 tmp_addr[ETH_ALEN]; 1455 int i; 1456 1457 /* default ... something at least */ 1458 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1459 1460 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1461 local->hw.wiphy->n_addresses <= 1) 1462 return; 1463 1464 mutex_lock(&local->iflist_mtx); 1465 1466 switch (type) { 1467 case NL80211_IFTYPE_MONITOR: 1468 /* doesn't matter */ 1469 break; 1470 case NL80211_IFTYPE_WDS: 1471 case NL80211_IFTYPE_AP_VLAN: 1472 /* match up with an AP interface */ 1473 list_for_each_entry(sdata, &local->interfaces, list) { 1474 if (sdata->vif.type != NL80211_IFTYPE_AP) 1475 continue; 1476 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1477 break; 1478 } 1479 /* keep default if no AP interface present */ 1480 break; 1481 case NL80211_IFTYPE_P2P_CLIENT: 1482 case NL80211_IFTYPE_P2P_GO: 1483 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) { 1484 list_for_each_entry(sdata, &local->interfaces, list) { 1485 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1486 continue; 1487 if (!ieee80211_sdata_running(sdata)) 1488 continue; 1489 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1490 goto out_unlock; 1491 } 1492 } 1493 /* otherwise fall through */ 1494 default: 1495 /* assign a new address if possible -- try n_addresses first */ 1496 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1497 bool used = false; 1498 1499 list_for_each_entry(sdata, &local->interfaces, list) { 1500 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1501 sdata->vif.addr)) { 1502 used = true; 1503 break; 1504 } 1505 } 1506 1507 if (!used) { 1508 memcpy(perm_addr, 1509 local->hw.wiphy->addresses[i].addr, 1510 ETH_ALEN); 1511 break; 1512 } 1513 } 1514 1515 /* try mask if available */ 1516 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1517 break; 1518 1519 m = local->hw.wiphy->addr_mask; 1520 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1521 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1522 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1523 1524 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1525 /* not a contiguous mask ... not handled now! */ 1526 pr_info("not contiguous\n"); 1527 break; 1528 } 1529 1530 /* 1531 * Pick address of existing interface in case user changed 1532 * MAC address manually, default to perm_addr. 1533 */ 1534 m = local->hw.wiphy->perm_addr; 1535 list_for_each_entry(sdata, &local->interfaces, list) { 1536 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1537 continue; 1538 m = sdata->vif.addr; 1539 break; 1540 } 1541 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1542 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1543 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1544 1545 inc = 1ULL<<__ffs64(mask); 1546 val = (start & mask); 1547 addr = (start & ~mask) | (val & mask); 1548 do { 1549 bool used = false; 1550 1551 tmp_addr[5] = addr >> 0*8; 1552 tmp_addr[4] = addr >> 1*8; 1553 tmp_addr[3] = addr >> 2*8; 1554 tmp_addr[2] = addr >> 3*8; 1555 tmp_addr[1] = addr >> 4*8; 1556 tmp_addr[0] = addr >> 5*8; 1557 1558 val += inc; 1559 1560 list_for_each_entry(sdata, &local->interfaces, list) { 1561 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 1562 used = true; 1563 break; 1564 } 1565 } 1566 1567 if (!used) { 1568 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1569 break; 1570 } 1571 addr = (start & ~mask) | (val & mask); 1572 } while (addr != start); 1573 1574 break; 1575 } 1576 1577 out_unlock: 1578 mutex_unlock(&local->iflist_mtx); 1579 } 1580 1581 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk) 1582 { 1583 struct ieee80211_sub_if_data *sdata; 1584 1585 sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk); 1586 1587 ieee80211_cleanup_sdata_stas(sdata); 1588 } 1589 1590 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1591 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1592 struct vif_params *params) 1593 { 1594 struct net_device *ndev = NULL; 1595 struct ieee80211_sub_if_data *sdata = NULL; 1596 int ret, i; 1597 int txqs = 1; 1598 1599 ASSERT_RTNL(); 1600 1601 if (type == NL80211_IFTYPE_P2P_DEVICE) { 1602 struct wireless_dev *wdev; 1603 1604 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1605 GFP_KERNEL); 1606 if (!sdata) 1607 return -ENOMEM; 1608 wdev = &sdata->wdev; 1609 1610 sdata->dev = NULL; 1611 strlcpy(sdata->name, name, IFNAMSIZ); 1612 ieee80211_assign_perm_addr(local, wdev->address, type); 1613 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1614 } else { 1615 if (local->hw.queues >= IEEE80211_NUM_ACS) 1616 txqs = IEEE80211_NUM_ACS; 1617 1618 ndev = alloc_netdev_mqs(sizeof(*sdata) + 1619 local->hw.vif_data_size, 1620 name, ieee80211_if_setup, txqs, 1); 1621 if (!ndev) 1622 return -ENOMEM; 1623 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1624 1625 ndev->needed_headroom = local->tx_headroom + 1626 4*6 /* four MAC addresses */ 1627 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1628 + 6 /* mesh */ 1629 + 8 /* rfc1042/bridge tunnel */ 1630 - ETH_HLEN /* ethernet hard_header_len */ 1631 + IEEE80211_ENCRYPT_HEADROOM; 1632 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1633 1634 ret = dev_alloc_name(ndev, ndev->name); 1635 if (ret < 0) { 1636 free_netdev(ndev); 1637 return ret; 1638 } 1639 1640 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1641 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1642 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1643 1644 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1645 sdata = netdev_priv(ndev); 1646 ndev->ieee80211_ptr = &sdata->wdev; 1647 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1648 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1649 1650 sdata->dev = ndev; 1651 } 1652 1653 /* initialise type-independent data */ 1654 sdata->wdev.wiphy = local->hw.wiphy; 1655 sdata->local = local; 1656 1657 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1658 skb_queue_head_init(&sdata->fragments[i].skb_list); 1659 1660 INIT_LIST_HEAD(&sdata->key_list); 1661 1662 spin_lock_init(&sdata->cleanup_stations_lock); 1663 INIT_LIST_HEAD(&sdata->cleanup_stations); 1664 INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk); 1665 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 1666 ieee80211_dfs_cac_timer_work); 1667 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 1668 ieee80211_delayed_tailroom_dec); 1669 1670 for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 1671 struct ieee80211_supported_band *sband; 1672 sband = local->hw.wiphy->bands[i]; 1673 sdata->rc_rateidx_mask[i] = 1674 sband ? (1 << sband->n_bitrates) - 1 : 0; 1675 if (sband) 1676 memcpy(sdata->rc_rateidx_mcs_mask[i], 1677 sband->ht_cap.mcs.rx_mask, 1678 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1679 else 1680 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1681 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1682 } 1683 1684 ieee80211_set_default_queues(sdata); 1685 1686 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1687 sdata->user_power_level = local->user_power_level; 1688 1689 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1690 1691 /* setup type-dependent data */ 1692 ieee80211_setup_sdata(sdata, type); 1693 1694 if (ndev) { 1695 if (params) { 1696 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1697 if (type == NL80211_IFTYPE_STATION) 1698 sdata->u.mgd.use_4addr = params->use_4addr; 1699 } 1700 1701 ndev->features |= local->hw.netdev_features; 1702 1703 ret = register_netdevice(ndev); 1704 if (ret) { 1705 free_netdev(ndev); 1706 return ret; 1707 } 1708 } 1709 1710 mutex_lock(&local->iflist_mtx); 1711 list_add_tail_rcu(&sdata->list, &local->interfaces); 1712 mutex_unlock(&local->iflist_mtx); 1713 1714 if (new_wdev) 1715 *new_wdev = &sdata->wdev; 1716 1717 return 0; 1718 } 1719 1720 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1721 { 1722 ASSERT_RTNL(); 1723 1724 mutex_lock(&sdata->local->iflist_mtx); 1725 list_del_rcu(&sdata->list); 1726 mutex_unlock(&sdata->local->iflist_mtx); 1727 1728 synchronize_rcu(); 1729 1730 if (sdata->dev) { 1731 unregister_netdevice(sdata->dev); 1732 } else { 1733 cfg80211_unregister_wdev(&sdata->wdev); 1734 kfree(sdata); 1735 } 1736 } 1737 1738 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 1739 { 1740 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 1741 return; 1742 ieee80211_do_stop(sdata, true); 1743 ieee80211_teardown_sdata(sdata); 1744 } 1745 1746 /* 1747 * Remove all interfaces, may only be called at hardware unregistration 1748 * time because it doesn't do RCU-safe list removals. 1749 */ 1750 void ieee80211_remove_interfaces(struct ieee80211_local *local) 1751 { 1752 struct ieee80211_sub_if_data *sdata, *tmp; 1753 LIST_HEAD(unreg_list); 1754 LIST_HEAD(wdev_list); 1755 1756 ASSERT_RTNL(); 1757 1758 /* 1759 * Close all AP_VLAN interfaces first, as otherwise they 1760 * might be closed while the AP interface they belong to 1761 * is closed, causing unregister_netdevice_many() to crash. 1762 */ 1763 list_for_each_entry(sdata, &local->interfaces, list) 1764 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1765 dev_close(sdata->dev); 1766 1767 mutex_lock(&local->iflist_mtx); 1768 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1769 list_del(&sdata->list); 1770 1771 if (sdata->dev) 1772 unregister_netdevice_queue(sdata->dev, &unreg_list); 1773 else 1774 list_add(&sdata->list, &wdev_list); 1775 } 1776 mutex_unlock(&local->iflist_mtx); 1777 unregister_netdevice_many(&unreg_list); 1778 list_del(&unreg_list); 1779 1780 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 1781 list_del(&sdata->list); 1782 cfg80211_unregister_wdev(&sdata->wdev); 1783 kfree(sdata); 1784 } 1785 } 1786 1787 static int netdev_notify(struct notifier_block *nb, 1788 unsigned long state, void *ptr) 1789 { 1790 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1791 struct ieee80211_sub_if_data *sdata; 1792 1793 if (state != NETDEV_CHANGENAME) 1794 return 0; 1795 1796 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1797 return 0; 1798 1799 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1800 return 0; 1801 1802 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1803 1804 memcpy(sdata->name, dev->name, IFNAMSIZ); 1805 1806 ieee80211_debugfs_rename_netdev(sdata); 1807 return 0; 1808 } 1809 1810 static struct notifier_block mac80211_netdev_notifier = { 1811 .notifier_call = netdev_notify, 1812 }; 1813 1814 int ieee80211_iface_init(void) 1815 { 1816 return register_netdevice_notifier(&mac80211_netdev_notifier); 1817 } 1818 1819 void ieee80211_iface_exit(void) 1820 { 1821 unregister_netdevice_notifier(&mac80211_netdev_notifier); 1822 } 1823