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 mutex_lock(&local->mtx); 422 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef, 423 IEEE80211_CHANCTX_EXCLUSIVE); 424 mutex_unlock(&local->mtx); 425 if (ret) { 426 drv_remove_interface(local, sdata); 427 kfree(sdata); 428 return ret; 429 } 430 431 mutex_lock(&local->iflist_mtx); 432 rcu_assign_pointer(local->monitor_sdata, sdata); 433 mutex_unlock(&local->iflist_mtx); 434 435 return 0; 436 } 437 438 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 439 { 440 struct ieee80211_sub_if_data *sdata; 441 442 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 443 return; 444 445 ASSERT_RTNL(); 446 447 mutex_lock(&local->iflist_mtx); 448 449 sdata = rcu_dereference_protected(local->monitor_sdata, 450 lockdep_is_held(&local->iflist_mtx)); 451 if (!sdata) { 452 mutex_unlock(&local->iflist_mtx); 453 return; 454 } 455 456 rcu_assign_pointer(local->monitor_sdata, NULL); 457 mutex_unlock(&local->iflist_mtx); 458 459 synchronize_net(); 460 461 mutex_lock(&local->mtx); 462 ieee80211_vif_release_channel(sdata); 463 mutex_unlock(&local->mtx); 464 465 drv_remove_interface(local, sdata); 466 467 kfree(sdata); 468 } 469 470 /* 471 * NOTE: Be very careful when changing this function, it must NOT return 472 * an error on interface type changes that have been pre-checked, so most 473 * checks should be in ieee80211_check_concurrent_iface. 474 */ 475 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 476 { 477 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 478 struct net_device *dev = wdev->netdev; 479 struct ieee80211_local *local = sdata->local; 480 struct sta_info *sta; 481 u32 changed = 0; 482 int res; 483 u32 hw_reconf_flags = 0; 484 485 switch (sdata->vif.type) { 486 case NL80211_IFTYPE_WDS: 487 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 488 return -ENOLINK; 489 break; 490 case NL80211_IFTYPE_AP_VLAN: { 491 struct ieee80211_sub_if_data *master; 492 493 if (!sdata->bss) 494 return -ENOLINK; 495 496 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 497 498 master = container_of(sdata->bss, 499 struct ieee80211_sub_if_data, u.ap); 500 sdata->control_port_protocol = 501 master->control_port_protocol; 502 sdata->control_port_no_encrypt = 503 master->control_port_no_encrypt; 504 sdata->vif.cab_queue = master->vif.cab_queue; 505 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 506 sizeof(sdata->vif.hw_queue)); 507 break; 508 } 509 case NL80211_IFTYPE_AP: 510 sdata->bss = &sdata->u.ap; 511 break; 512 case NL80211_IFTYPE_MESH_POINT: 513 case NL80211_IFTYPE_STATION: 514 case NL80211_IFTYPE_MONITOR: 515 case NL80211_IFTYPE_ADHOC: 516 case NL80211_IFTYPE_P2P_DEVICE: 517 /* no special treatment */ 518 break; 519 case NL80211_IFTYPE_UNSPECIFIED: 520 case NUM_NL80211_IFTYPES: 521 case NL80211_IFTYPE_P2P_CLIENT: 522 case NL80211_IFTYPE_P2P_GO: 523 /* cannot happen */ 524 WARN_ON(1); 525 break; 526 } 527 528 if (local->open_count == 0) { 529 res = drv_start(local); 530 if (res) 531 goto err_del_bss; 532 /* we're brought up, everything changes */ 533 hw_reconf_flags = ~0; 534 ieee80211_led_radio(local, true); 535 ieee80211_mod_tpt_led_trig(local, 536 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 537 } 538 539 /* 540 * Copy the hopefully now-present MAC address to 541 * this interface, if it has the special null one. 542 */ 543 if (dev && is_zero_ether_addr(dev->dev_addr)) { 544 memcpy(dev->dev_addr, 545 local->hw.wiphy->perm_addr, 546 ETH_ALEN); 547 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 548 549 if (!is_valid_ether_addr(dev->dev_addr)) { 550 res = -EADDRNOTAVAIL; 551 goto err_stop; 552 } 553 } 554 555 switch (sdata->vif.type) { 556 case NL80211_IFTYPE_AP_VLAN: 557 /* no need to tell driver, but set carrier and chanctx */ 558 if (rtnl_dereference(sdata->bss->beacon)) { 559 ieee80211_vif_vlan_copy_chanctx(sdata); 560 netif_carrier_on(dev); 561 } else { 562 netif_carrier_off(dev); 563 } 564 break; 565 case NL80211_IFTYPE_MONITOR: 566 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 567 local->cooked_mntrs++; 568 break; 569 } 570 571 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 572 res = drv_add_interface(local, sdata); 573 if (res) 574 goto err_stop; 575 } else if (local->monitors == 0 && local->open_count == 0) { 576 res = ieee80211_add_virtual_monitor(local); 577 if (res) 578 goto err_stop; 579 } 580 581 /* must be before the call to ieee80211_configure_filter */ 582 local->monitors++; 583 if (local->monitors == 1) { 584 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 585 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 586 } 587 588 ieee80211_adjust_monitor_flags(sdata, 1); 589 ieee80211_configure_filter(local); 590 mutex_lock(&local->mtx); 591 ieee80211_recalc_idle(local); 592 mutex_unlock(&local->mtx); 593 594 netif_carrier_on(dev); 595 break; 596 default: 597 if (coming_up) { 598 ieee80211_del_virtual_monitor(local); 599 600 res = drv_add_interface(local, sdata); 601 if (res) 602 goto err_stop; 603 res = ieee80211_check_queues(sdata, 604 ieee80211_vif_type_p2p(&sdata->vif)); 605 if (res) 606 goto err_del_interface; 607 } 608 609 if (sdata->vif.type == NL80211_IFTYPE_AP) { 610 local->fif_pspoll++; 611 local->fif_probe_req++; 612 613 ieee80211_configure_filter(local); 614 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 615 local->fif_probe_req++; 616 } 617 618 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 619 changed |= ieee80211_reset_erp_info(sdata); 620 ieee80211_bss_info_change_notify(sdata, changed); 621 622 switch (sdata->vif.type) { 623 case NL80211_IFTYPE_STATION: 624 case NL80211_IFTYPE_ADHOC: 625 case NL80211_IFTYPE_AP: 626 case NL80211_IFTYPE_MESH_POINT: 627 netif_carrier_off(dev); 628 break; 629 case NL80211_IFTYPE_WDS: 630 case NL80211_IFTYPE_P2P_DEVICE: 631 break; 632 default: 633 /* not reached */ 634 WARN_ON(1); 635 } 636 637 /* 638 * set default queue parameters so drivers don't 639 * need to initialise the hardware if the hardware 640 * doesn't start up with sane defaults 641 */ 642 ieee80211_set_wmm_default(sdata, true); 643 } 644 645 set_bit(SDATA_STATE_RUNNING, &sdata->state); 646 647 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 648 /* Create STA entry for the WDS peer */ 649 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 650 GFP_KERNEL); 651 if (!sta) { 652 res = -ENOMEM; 653 goto err_del_interface; 654 } 655 656 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 657 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 658 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 659 660 res = sta_info_insert(sta); 661 if (res) { 662 /* STA has been freed */ 663 goto err_del_interface; 664 } 665 666 rate_control_rate_init(sta); 667 netif_carrier_on(dev); 668 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 669 rcu_assign_pointer(local->p2p_sdata, sdata); 670 } 671 672 /* 673 * set_multicast_list will be invoked by the networking core 674 * which will check whether any increments here were done in 675 * error and sync them down to the hardware as filter flags. 676 */ 677 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 678 atomic_inc(&local->iff_allmultis); 679 680 if (sdata->flags & IEEE80211_SDATA_PROMISC) 681 atomic_inc(&local->iff_promiscs); 682 683 if (coming_up) 684 local->open_count++; 685 686 if (hw_reconf_flags) 687 ieee80211_hw_config(local, hw_reconf_flags); 688 689 ieee80211_recalc_ps(local, -1); 690 691 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 692 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 693 /* XXX: for AP_VLAN, actually track AP queues */ 694 netif_tx_start_all_queues(dev); 695 } else if (dev) { 696 unsigned long flags; 697 int n_acs = IEEE80211_NUM_ACS; 698 int ac; 699 700 if (local->hw.queues < IEEE80211_NUM_ACS) 701 n_acs = 1; 702 703 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 704 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE || 705 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 && 706 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) { 707 for (ac = 0; ac < n_acs; ac++) { 708 int ac_queue = sdata->vif.hw_queue[ac]; 709 710 if (local->queue_stop_reasons[ac_queue] == 0 && 711 skb_queue_empty(&local->pending[ac_queue])) 712 netif_start_subqueue(dev, ac); 713 } 714 } 715 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 716 } 717 718 return 0; 719 err_del_interface: 720 drv_remove_interface(local, sdata); 721 err_stop: 722 if (!local->open_count) 723 drv_stop(local); 724 err_del_bss: 725 sdata->bss = NULL; 726 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 727 list_del(&sdata->u.vlan.list); 728 /* might already be clear but that doesn't matter */ 729 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 730 return res; 731 } 732 733 static int ieee80211_open(struct net_device *dev) 734 { 735 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 736 int err; 737 738 /* fail early if user set an invalid address */ 739 if (!is_valid_ether_addr(dev->dev_addr)) 740 return -EADDRNOTAVAIL; 741 742 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 743 if (err) 744 return err; 745 746 return ieee80211_do_open(&sdata->wdev, true); 747 } 748 749 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 750 bool going_down) 751 { 752 struct ieee80211_local *local = sdata->local; 753 unsigned long flags; 754 struct sk_buff *skb, *tmp; 755 u32 hw_reconf_flags = 0; 756 int i, flushed; 757 struct ps_data *ps; 758 struct cfg80211_chan_def chandef; 759 760 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 761 762 if (rcu_access_pointer(local->scan_sdata) == sdata) 763 ieee80211_scan_cancel(local); 764 765 /* 766 * Stop TX on this interface first. 767 */ 768 if (sdata->dev) 769 netif_tx_stop_all_queues(sdata->dev); 770 771 ieee80211_roc_purge(local, sdata); 772 773 if (sdata->vif.type == NL80211_IFTYPE_STATION) 774 ieee80211_mgd_stop(sdata); 775 776 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 777 ieee80211_ibss_stop(sdata); 778 779 780 /* 781 * Remove all stations associated with this interface. 782 * 783 * This must be done before calling ops->remove_interface() 784 * because otherwise we can later invoke ops->sta_notify() 785 * whenever the STAs are removed, and that invalidates driver 786 * assumptions about always getting a vif pointer that is valid 787 * (because if we remove a STA after ops->remove_interface() 788 * the driver will have removed the vif info already!) 789 * 790 * This is relevant only in WDS mode, in all other modes we've 791 * already removed all stations when disconnecting or similar, 792 * so warn otherwise. 793 */ 794 flushed = sta_info_flush(sdata); 795 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) || 796 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)); 797 798 /* don't count this interface for promisc/allmulti while it is down */ 799 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 800 atomic_dec(&local->iff_allmultis); 801 802 if (sdata->flags & IEEE80211_SDATA_PROMISC) 803 atomic_dec(&local->iff_promiscs); 804 805 if (sdata->vif.type == NL80211_IFTYPE_AP) { 806 local->fif_pspoll--; 807 local->fif_probe_req--; 808 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 809 local->fif_probe_req--; 810 } 811 812 if (sdata->dev) { 813 netif_addr_lock_bh(sdata->dev); 814 spin_lock_bh(&local->filter_lock); 815 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 816 sdata->dev->addr_len); 817 spin_unlock_bh(&local->filter_lock); 818 netif_addr_unlock_bh(sdata->dev); 819 } 820 821 del_timer_sync(&local->dynamic_ps_timer); 822 cancel_work_sync(&local->dynamic_ps_enable_work); 823 824 cancel_work_sync(&sdata->recalc_smps); 825 sdata->vif.csa_active = false; 826 cancel_work_sync(&sdata->csa_finalize_work); 827 828 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); 829 830 if (sdata->wdev.cac_started) { 831 chandef = sdata->vif.bss_conf.chandef; 832 WARN_ON(local->suspended); 833 mutex_lock(&local->mtx); 834 ieee80211_vif_release_channel(sdata); 835 mutex_unlock(&local->mtx); 836 cfg80211_cac_event(sdata->dev, &chandef, 837 NL80211_RADAR_CAC_ABORTED, 838 GFP_KERNEL); 839 } 840 841 /* APs need special treatment */ 842 if (sdata->vif.type == NL80211_IFTYPE_AP) { 843 struct ieee80211_sub_if_data *vlan, *tmpsdata; 844 845 /* down all dependent devices, that is VLANs */ 846 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 847 u.vlan.list) 848 dev_close(vlan->dev); 849 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 850 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 851 /* remove all packets in parent bc_buf pointing to this dev */ 852 ps = &sdata->bss->ps; 853 854 spin_lock_irqsave(&ps->bc_buf.lock, flags); 855 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 856 if (skb->dev == sdata->dev) { 857 __skb_unlink(skb, &ps->bc_buf); 858 local->total_ps_buffered--; 859 ieee80211_free_txskb(&local->hw, skb); 860 } 861 } 862 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 863 } 864 865 if (going_down) 866 local->open_count--; 867 868 switch (sdata->vif.type) { 869 case NL80211_IFTYPE_AP_VLAN: 870 list_del(&sdata->u.vlan.list); 871 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL); 872 /* no need to tell driver */ 873 break; 874 case NL80211_IFTYPE_MONITOR: 875 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 876 local->cooked_mntrs--; 877 break; 878 } 879 880 local->monitors--; 881 if (local->monitors == 0) { 882 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 883 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 884 } 885 886 ieee80211_adjust_monitor_flags(sdata, -1); 887 break; 888 case NL80211_IFTYPE_P2P_DEVICE: 889 /* relies on synchronize_rcu() below */ 890 rcu_assign_pointer(local->p2p_sdata, NULL); 891 /* fall through */ 892 default: 893 cancel_work_sync(&sdata->work); 894 /* 895 * When we get here, the interface is marked down. 896 * Free the remaining keys, if there are any 897 * (shouldn't be, except maybe in WDS mode?) 898 * 899 * Force the key freeing to always synchronize_net() 900 * to wait for the RX path in case it is using this 901 * interface enqueuing frames * at this very time on 902 * another CPU. 903 */ 904 ieee80211_free_keys(sdata, true); 905 906 /* fall through */ 907 case NL80211_IFTYPE_AP: 908 skb_queue_purge(&sdata->skb_queue); 909 } 910 911 sdata->bss = NULL; 912 913 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 914 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 915 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 916 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 917 if (info->control.vif == &sdata->vif) { 918 __skb_unlink(skb, &local->pending[i]); 919 ieee80211_free_txskb(&local->hw, skb); 920 } 921 } 922 } 923 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 924 925 if (local->open_count == 0) 926 ieee80211_clear_tx_pending(local); 927 928 /* 929 * If the interface goes down while suspended, presumably because 930 * the device was unplugged and that happens before our resume, 931 * then the driver is already unconfigured and the remainder of 932 * this function isn't needed. 933 * XXX: what about WoWLAN? If the device has software state, e.g. 934 * memory allocated, it might expect teardown commands from 935 * mac80211 here? 936 */ 937 if (local->suspended) { 938 WARN_ON(local->wowlan); 939 WARN_ON(rtnl_dereference(local->monitor_sdata)); 940 return; 941 } 942 943 switch (sdata->vif.type) { 944 case NL80211_IFTYPE_AP_VLAN: 945 break; 946 case NL80211_IFTYPE_MONITOR: 947 if (local->monitors == 0) 948 ieee80211_del_virtual_monitor(local); 949 950 mutex_lock(&local->mtx); 951 ieee80211_recalc_idle(local); 952 mutex_unlock(&local->mtx); 953 954 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 955 break; 956 957 /* fall through */ 958 default: 959 if (going_down) 960 drv_remove_interface(local, sdata); 961 } 962 963 ieee80211_recalc_ps(local, -1); 964 965 if (local->open_count == 0) { 966 ieee80211_stop_device(local); 967 968 /* no reconfiguring after stop! */ 969 return; 970 } 971 972 /* do after stop to avoid reconfiguring when we stop anyway */ 973 ieee80211_configure_filter(local); 974 ieee80211_hw_config(local, hw_reconf_flags); 975 976 if (local->monitors == local->open_count) 977 ieee80211_add_virtual_monitor(local); 978 } 979 980 static int ieee80211_stop(struct net_device *dev) 981 { 982 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 983 984 ieee80211_do_stop(sdata, true); 985 986 return 0; 987 } 988 989 static void ieee80211_set_multicast_list(struct net_device *dev) 990 { 991 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 992 struct ieee80211_local *local = sdata->local; 993 int allmulti, promisc, sdata_allmulti, sdata_promisc; 994 995 allmulti = !!(dev->flags & IFF_ALLMULTI); 996 promisc = !!(dev->flags & IFF_PROMISC); 997 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 998 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); 999 1000 if (allmulti != sdata_allmulti) { 1001 if (dev->flags & IFF_ALLMULTI) 1002 atomic_inc(&local->iff_allmultis); 1003 else 1004 atomic_dec(&local->iff_allmultis); 1005 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 1006 } 1007 1008 if (promisc != sdata_promisc) { 1009 if (dev->flags & IFF_PROMISC) 1010 atomic_inc(&local->iff_promiscs); 1011 else 1012 atomic_dec(&local->iff_promiscs); 1013 sdata->flags ^= IEEE80211_SDATA_PROMISC; 1014 } 1015 spin_lock_bh(&local->filter_lock); 1016 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 1017 spin_unlock_bh(&local->filter_lock); 1018 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 1019 } 1020 1021 /* 1022 * Called when the netdev is removed or, by the code below, before 1023 * the interface type changes. 1024 */ 1025 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1026 { 1027 int i; 1028 1029 /* free extra data */ 1030 ieee80211_free_keys(sdata, false); 1031 1032 ieee80211_debugfs_remove_netdev(sdata); 1033 1034 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1035 __skb_queue_purge(&sdata->fragments[i].skb_list); 1036 sdata->fragment_next = 0; 1037 1038 if (ieee80211_vif_is_mesh(&sdata->vif)) 1039 mesh_rmc_free(sdata); 1040 } 1041 1042 static void ieee80211_uninit(struct net_device *dev) 1043 { 1044 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 1045 } 1046 1047 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 1048 struct sk_buff *skb, 1049 void *accel_priv) 1050 { 1051 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 1052 } 1053 1054 static const struct net_device_ops ieee80211_dataif_ops = { 1055 .ndo_open = ieee80211_open, 1056 .ndo_stop = ieee80211_stop, 1057 .ndo_uninit = ieee80211_uninit, 1058 .ndo_start_xmit = ieee80211_subif_start_xmit, 1059 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1060 .ndo_change_mtu = ieee80211_change_mtu, 1061 .ndo_set_mac_address = ieee80211_change_mac, 1062 .ndo_select_queue = ieee80211_netdev_select_queue, 1063 }; 1064 1065 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 1066 struct sk_buff *skb, 1067 void *accel_priv) 1068 { 1069 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1070 struct ieee80211_local *local = sdata->local; 1071 struct ieee80211_hdr *hdr; 1072 struct ieee80211_radiotap_header *rtap = (void *)skb->data; 1073 1074 if (local->hw.queues < IEEE80211_NUM_ACS) 1075 return 0; 1076 1077 if (skb->len < 4 || 1078 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) 1079 return 0; /* doesn't matter, frame will be dropped */ 1080 1081 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); 1082 1083 return ieee80211_select_queue_80211(sdata, skb, hdr); 1084 } 1085 1086 static const struct net_device_ops ieee80211_monitorif_ops = { 1087 .ndo_open = ieee80211_open, 1088 .ndo_stop = ieee80211_stop, 1089 .ndo_uninit = ieee80211_uninit, 1090 .ndo_start_xmit = ieee80211_monitor_start_xmit, 1091 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1092 .ndo_change_mtu = ieee80211_change_mtu, 1093 .ndo_set_mac_address = ieee80211_change_mac, 1094 .ndo_select_queue = ieee80211_monitor_select_queue, 1095 }; 1096 1097 static void ieee80211_if_setup(struct net_device *dev) 1098 { 1099 ether_setup(dev); 1100 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1101 dev->netdev_ops = &ieee80211_dataif_ops; 1102 dev->destructor = free_netdev; 1103 } 1104 1105 static void ieee80211_iface_work(struct work_struct *work) 1106 { 1107 struct ieee80211_sub_if_data *sdata = 1108 container_of(work, struct ieee80211_sub_if_data, work); 1109 struct ieee80211_local *local = sdata->local; 1110 struct sk_buff *skb; 1111 struct sta_info *sta; 1112 struct ieee80211_ra_tid *ra_tid; 1113 1114 if (!ieee80211_sdata_running(sdata)) 1115 return; 1116 1117 if (local->scanning) 1118 return; 1119 1120 /* 1121 * ieee80211_queue_work() should have picked up most cases, 1122 * here we'll pick the rest. 1123 */ 1124 if (WARN(local->suspended, 1125 "interface work scheduled while going to suspend\n")) 1126 return; 1127 1128 /* first process frames */ 1129 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1130 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1131 1132 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { 1133 ra_tid = (void *)&skb->cb; 1134 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, 1135 ra_tid->tid); 1136 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { 1137 ra_tid = (void *)&skb->cb; 1138 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, 1139 ra_tid->tid); 1140 } else if (ieee80211_is_action(mgmt->frame_control) && 1141 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1142 int len = skb->len; 1143 1144 mutex_lock(&local->sta_mtx); 1145 sta = sta_info_get_bss(sdata, mgmt->sa); 1146 if (sta) { 1147 switch (mgmt->u.action.u.addba_req.action_code) { 1148 case WLAN_ACTION_ADDBA_REQ: 1149 ieee80211_process_addba_request( 1150 local, sta, mgmt, len); 1151 break; 1152 case WLAN_ACTION_ADDBA_RESP: 1153 ieee80211_process_addba_resp(local, sta, 1154 mgmt, len); 1155 break; 1156 case WLAN_ACTION_DELBA: 1157 ieee80211_process_delba(sdata, sta, 1158 mgmt, len); 1159 break; 1160 default: 1161 WARN_ON(1); 1162 break; 1163 } 1164 } 1165 mutex_unlock(&local->sta_mtx); 1166 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1167 struct ieee80211_hdr *hdr = (void *)mgmt; 1168 /* 1169 * So the frame isn't mgmt, but frame_control 1170 * is at the right place anyway, of course, so 1171 * the if statement is correct. 1172 * 1173 * Warn if we have other data frame types here, 1174 * they must not get here. 1175 */ 1176 WARN_ON(hdr->frame_control & 1177 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1178 WARN_ON(!(hdr->seq_ctrl & 1179 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1180 /* 1181 * This was a fragment of a frame, received while 1182 * a block-ack session was active. That cannot be 1183 * right, so terminate the session. 1184 */ 1185 mutex_lock(&local->sta_mtx); 1186 sta = sta_info_get_bss(sdata, mgmt->sa); 1187 if (sta) { 1188 u16 tid = *ieee80211_get_qos_ctl(hdr) & 1189 IEEE80211_QOS_CTL_TID_MASK; 1190 1191 __ieee80211_stop_rx_ba_session( 1192 sta, tid, WLAN_BACK_RECIPIENT, 1193 WLAN_REASON_QSTA_REQUIRE_SETUP, 1194 true); 1195 } 1196 mutex_unlock(&local->sta_mtx); 1197 } else switch (sdata->vif.type) { 1198 case NL80211_IFTYPE_STATION: 1199 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1200 break; 1201 case NL80211_IFTYPE_ADHOC: 1202 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1203 break; 1204 case NL80211_IFTYPE_MESH_POINT: 1205 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1206 break; 1207 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1208 break; 1209 default: 1210 WARN(1, "frame for unexpected interface type"); 1211 break; 1212 } 1213 1214 kfree_skb(skb); 1215 } 1216 1217 /* then other type-dependent work */ 1218 switch (sdata->vif.type) { 1219 case NL80211_IFTYPE_STATION: 1220 ieee80211_sta_work(sdata); 1221 break; 1222 case NL80211_IFTYPE_ADHOC: 1223 ieee80211_ibss_work(sdata); 1224 break; 1225 case NL80211_IFTYPE_MESH_POINT: 1226 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1227 break; 1228 ieee80211_mesh_work(sdata); 1229 break; 1230 default: 1231 break; 1232 } 1233 } 1234 1235 static void ieee80211_recalc_smps_work(struct work_struct *work) 1236 { 1237 struct ieee80211_sub_if_data *sdata = 1238 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1239 1240 ieee80211_recalc_smps(sdata); 1241 } 1242 1243 /* 1244 * Helper function to initialise an interface to a specific type. 1245 */ 1246 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1247 enum nl80211_iftype type) 1248 { 1249 /* clear type-dependent union */ 1250 memset(&sdata->u, 0, sizeof(sdata->u)); 1251 1252 /* and set some type-dependent values */ 1253 sdata->vif.type = type; 1254 sdata->vif.p2p = false; 1255 sdata->wdev.iftype = type; 1256 1257 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1258 sdata->control_port_no_encrypt = false; 1259 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1260 1261 sdata->noack_map = 0; 1262 1263 /* only monitor/p2p-device differ */ 1264 if (sdata->dev) { 1265 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1266 sdata->dev->type = ARPHRD_ETHER; 1267 } 1268 1269 skb_queue_head_init(&sdata->skb_queue); 1270 INIT_WORK(&sdata->work, ieee80211_iface_work); 1271 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1272 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work); 1273 1274 switch (type) { 1275 case NL80211_IFTYPE_P2P_GO: 1276 type = NL80211_IFTYPE_AP; 1277 sdata->vif.type = type; 1278 sdata->vif.p2p = true; 1279 /* fall through */ 1280 case NL80211_IFTYPE_AP: 1281 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1282 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1283 INIT_WORK(&sdata->u.ap.request_smps_work, 1284 ieee80211_request_smps_ap_work); 1285 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1286 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF; 1287 break; 1288 case NL80211_IFTYPE_P2P_CLIENT: 1289 type = NL80211_IFTYPE_STATION; 1290 sdata->vif.type = type; 1291 sdata->vif.p2p = true; 1292 /* fall through */ 1293 case NL80211_IFTYPE_STATION: 1294 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1295 ieee80211_sta_setup_sdata(sdata); 1296 break; 1297 case NL80211_IFTYPE_ADHOC: 1298 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1299 ieee80211_ibss_setup_sdata(sdata); 1300 break; 1301 case NL80211_IFTYPE_MESH_POINT: 1302 if (ieee80211_vif_is_mesh(&sdata->vif)) 1303 ieee80211_mesh_init_sdata(sdata); 1304 break; 1305 case NL80211_IFTYPE_MONITOR: 1306 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1307 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1308 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 1309 MONITOR_FLAG_OTHER_BSS; 1310 break; 1311 case NL80211_IFTYPE_WDS: 1312 sdata->vif.bss_conf.bssid = NULL; 1313 break; 1314 case NL80211_IFTYPE_AP_VLAN: 1315 case NL80211_IFTYPE_P2P_DEVICE: 1316 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1317 break; 1318 case NL80211_IFTYPE_UNSPECIFIED: 1319 case NUM_NL80211_IFTYPES: 1320 BUG(); 1321 break; 1322 } 1323 1324 ieee80211_debugfs_add_netdev(sdata); 1325 } 1326 1327 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1328 enum nl80211_iftype type) 1329 { 1330 struct ieee80211_local *local = sdata->local; 1331 int ret, err; 1332 enum nl80211_iftype internal_type = type; 1333 bool p2p = false; 1334 1335 ASSERT_RTNL(); 1336 1337 if (!local->ops->change_interface) 1338 return -EBUSY; 1339 1340 switch (sdata->vif.type) { 1341 case NL80211_IFTYPE_AP: 1342 case NL80211_IFTYPE_STATION: 1343 case NL80211_IFTYPE_ADHOC: 1344 /* 1345 * Could maybe also all others here? 1346 * Just not sure how that interacts 1347 * with the RX/config path e.g. for 1348 * mesh. 1349 */ 1350 break; 1351 default: 1352 return -EBUSY; 1353 } 1354 1355 switch (type) { 1356 case NL80211_IFTYPE_AP: 1357 case NL80211_IFTYPE_STATION: 1358 case NL80211_IFTYPE_ADHOC: 1359 /* 1360 * Could probably support everything 1361 * but WDS here (WDS do_open can fail 1362 * under memory pressure, which this 1363 * code isn't prepared to handle). 1364 */ 1365 break; 1366 case NL80211_IFTYPE_P2P_CLIENT: 1367 p2p = true; 1368 internal_type = NL80211_IFTYPE_STATION; 1369 break; 1370 case NL80211_IFTYPE_P2P_GO: 1371 p2p = true; 1372 internal_type = NL80211_IFTYPE_AP; 1373 break; 1374 default: 1375 return -EBUSY; 1376 } 1377 1378 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1379 if (ret) 1380 return ret; 1381 1382 ieee80211_do_stop(sdata, false); 1383 1384 ieee80211_teardown_sdata(sdata); 1385 1386 ret = drv_change_interface(local, sdata, internal_type, p2p); 1387 if (ret) 1388 type = ieee80211_vif_type_p2p(&sdata->vif); 1389 1390 /* 1391 * Ignore return value here, there's not much we can do since 1392 * the driver changed the interface type internally already. 1393 * The warnings will hopefully make driver authors fix it :-) 1394 */ 1395 ieee80211_check_queues(sdata, type); 1396 1397 ieee80211_setup_sdata(sdata, type); 1398 1399 err = ieee80211_do_open(&sdata->wdev, false); 1400 WARN(err, "type change: do_open returned %d", err); 1401 1402 return ret; 1403 } 1404 1405 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1406 enum nl80211_iftype type) 1407 { 1408 int ret; 1409 1410 ASSERT_RTNL(); 1411 1412 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1413 return 0; 1414 1415 if (ieee80211_sdata_running(sdata)) { 1416 ret = ieee80211_runtime_change_iftype(sdata, type); 1417 if (ret) 1418 return ret; 1419 } else { 1420 /* Purge and reset type-dependent state. */ 1421 ieee80211_teardown_sdata(sdata); 1422 ieee80211_setup_sdata(sdata, type); 1423 } 1424 1425 /* reset some values that shouldn't be kept across type changes */ 1426 sdata->drop_unencrypted = 0; 1427 if (type == NL80211_IFTYPE_STATION) 1428 sdata->u.mgd.use_4addr = false; 1429 1430 return 0; 1431 } 1432 1433 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1434 u8 *perm_addr, enum nl80211_iftype type) 1435 { 1436 struct ieee80211_sub_if_data *sdata; 1437 u64 mask, start, addr, val, inc; 1438 u8 *m; 1439 u8 tmp_addr[ETH_ALEN]; 1440 int i; 1441 1442 /* default ... something at least */ 1443 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1444 1445 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1446 local->hw.wiphy->n_addresses <= 1) 1447 return; 1448 1449 mutex_lock(&local->iflist_mtx); 1450 1451 switch (type) { 1452 case NL80211_IFTYPE_MONITOR: 1453 /* doesn't matter */ 1454 break; 1455 case NL80211_IFTYPE_WDS: 1456 case NL80211_IFTYPE_AP_VLAN: 1457 /* match up with an AP interface */ 1458 list_for_each_entry(sdata, &local->interfaces, list) { 1459 if (sdata->vif.type != NL80211_IFTYPE_AP) 1460 continue; 1461 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1462 break; 1463 } 1464 /* keep default if no AP interface present */ 1465 break; 1466 case NL80211_IFTYPE_P2P_CLIENT: 1467 case NL80211_IFTYPE_P2P_GO: 1468 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) { 1469 list_for_each_entry(sdata, &local->interfaces, list) { 1470 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1471 continue; 1472 if (!ieee80211_sdata_running(sdata)) 1473 continue; 1474 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1475 goto out_unlock; 1476 } 1477 } 1478 /* otherwise fall through */ 1479 default: 1480 /* assign a new address if possible -- try n_addresses first */ 1481 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1482 bool used = false; 1483 1484 list_for_each_entry(sdata, &local->interfaces, list) { 1485 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1486 sdata->vif.addr)) { 1487 used = true; 1488 break; 1489 } 1490 } 1491 1492 if (!used) { 1493 memcpy(perm_addr, 1494 local->hw.wiphy->addresses[i].addr, 1495 ETH_ALEN); 1496 break; 1497 } 1498 } 1499 1500 /* try mask if available */ 1501 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1502 break; 1503 1504 m = local->hw.wiphy->addr_mask; 1505 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1506 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1507 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1508 1509 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1510 /* not a contiguous mask ... not handled now! */ 1511 pr_info("not contiguous\n"); 1512 break; 1513 } 1514 1515 /* 1516 * Pick address of existing interface in case user changed 1517 * MAC address manually, default to perm_addr. 1518 */ 1519 m = local->hw.wiphy->perm_addr; 1520 list_for_each_entry(sdata, &local->interfaces, list) { 1521 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1522 continue; 1523 m = sdata->vif.addr; 1524 break; 1525 } 1526 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1527 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1528 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1529 1530 inc = 1ULL<<__ffs64(mask); 1531 val = (start & mask); 1532 addr = (start & ~mask) | (val & mask); 1533 do { 1534 bool used = false; 1535 1536 tmp_addr[5] = addr >> 0*8; 1537 tmp_addr[4] = addr >> 1*8; 1538 tmp_addr[3] = addr >> 2*8; 1539 tmp_addr[2] = addr >> 3*8; 1540 tmp_addr[1] = addr >> 4*8; 1541 tmp_addr[0] = addr >> 5*8; 1542 1543 val += inc; 1544 1545 list_for_each_entry(sdata, &local->interfaces, list) { 1546 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 1547 used = true; 1548 break; 1549 } 1550 } 1551 1552 if (!used) { 1553 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1554 break; 1555 } 1556 addr = (start & ~mask) | (val & mask); 1557 } while (addr != start); 1558 1559 break; 1560 } 1561 1562 out_unlock: 1563 mutex_unlock(&local->iflist_mtx); 1564 } 1565 1566 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1567 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1568 struct vif_params *params) 1569 { 1570 struct net_device *ndev = NULL; 1571 struct ieee80211_sub_if_data *sdata = NULL; 1572 int ret, i; 1573 int txqs = 1; 1574 1575 ASSERT_RTNL(); 1576 1577 if (type == NL80211_IFTYPE_P2P_DEVICE) { 1578 struct wireless_dev *wdev; 1579 1580 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1581 GFP_KERNEL); 1582 if (!sdata) 1583 return -ENOMEM; 1584 wdev = &sdata->wdev; 1585 1586 sdata->dev = NULL; 1587 strlcpy(sdata->name, name, IFNAMSIZ); 1588 ieee80211_assign_perm_addr(local, wdev->address, type); 1589 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1590 } else { 1591 if (local->hw.queues >= IEEE80211_NUM_ACS) 1592 txqs = IEEE80211_NUM_ACS; 1593 1594 ndev = alloc_netdev_mqs(sizeof(*sdata) + 1595 local->hw.vif_data_size, 1596 name, ieee80211_if_setup, txqs, 1); 1597 if (!ndev) 1598 return -ENOMEM; 1599 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1600 1601 ndev->needed_headroom = local->tx_headroom + 1602 4*6 /* four MAC addresses */ 1603 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1604 + 6 /* mesh */ 1605 + 8 /* rfc1042/bridge tunnel */ 1606 - ETH_HLEN /* ethernet hard_header_len */ 1607 + IEEE80211_ENCRYPT_HEADROOM; 1608 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1609 1610 ret = dev_alloc_name(ndev, ndev->name); 1611 if (ret < 0) { 1612 free_netdev(ndev); 1613 return ret; 1614 } 1615 1616 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1617 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1618 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1619 1620 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1621 sdata = netdev_priv(ndev); 1622 ndev->ieee80211_ptr = &sdata->wdev; 1623 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1624 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1625 1626 sdata->dev = ndev; 1627 } 1628 1629 /* initialise type-independent data */ 1630 sdata->wdev.wiphy = local->hw.wiphy; 1631 sdata->local = local; 1632 1633 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1634 skb_queue_head_init(&sdata->fragments[i].skb_list); 1635 1636 INIT_LIST_HEAD(&sdata->key_list); 1637 1638 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 1639 ieee80211_dfs_cac_timer_work); 1640 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 1641 ieee80211_delayed_tailroom_dec); 1642 1643 for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 1644 struct ieee80211_supported_band *sband; 1645 sband = local->hw.wiphy->bands[i]; 1646 sdata->rc_rateidx_mask[i] = 1647 sband ? (1 << sband->n_bitrates) - 1 : 0; 1648 if (sband) 1649 memcpy(sdata->rc_rateidx_mcs_mask[i], 1650 sband->ht_cap.mcs.rx_mask, 1651 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1652 else 1653 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1654 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1655 } 1656 1657 ieee80211_set_default_queues(sdata); 1658 1659 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1660 sdata->user_power_level = local->user_power_level; 1661 1662 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1663 1664 /* setup type-dependent data */ 1665 ieee80211_setup_sdata(sdata, type); 1666 1667 if (ndev) { 1668 if (params) { 1669 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1670 if (type == NL80211_IFTYPE_STATION) 1671 sdata->u.mgd.use_4addr = params->use_4addr; 1672 } 1673 1674 ndev->features |= local->hw.netdev_features; 1675 1676 ret = register_netdevice(ndev); 1677 if (ret) { 1678 free_netdev(ndev); 1679 return ret; 1680 } 1681 } 1682 1683 mutex_lock(&local->iflist_mtx); 1684 list_add_tail_rcu(&sdata->list, &local->interfaces); 1685 mutex_unlock(&local->iflist_mtx); 1686 1687 if (new_wdev) 1688 *new_wdev = &sdata->wdev; 1689 1690 return 0; 1691 } 1692 1693 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1694 { 1695 ASSERT_RTNL(); 1696 1697 mutex_lock(&sdata->local->iflist_mtx); 1698 list_del_rcu(&sdata->list); 1699 mutex_unlock(&sdata->local->iflist_mtx); 1700 1701 synchronize_rcu(); 1702 1703 if (sdata->dev) { 1704 unregister_netdevice(sdata->dev); 1705 } else { 1706 cfg80211_unregister_wdev(&sdata->wdev); 1707 kfree(sdata); 1708 } 1709 } 1710 1711 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 1712 { 1713 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 1714 return; 1715 ieee80211_do_stop(sdata, true); 1716 ieee80211_teardown_sdata(sdata); 1717 } 1718 1719 /* 1720 * Remove all interfaces, may only be called at hardware unregistration 1721 * time because it doesn't do RCU-safe list removals. 1722 */ 1723 void ieee80211_remove_interfaces(struct ieee80211_local *local) 1724 { 1725 struct ieee80211_sub_if_data *sdata, *tmp; 1726 LIST_HEAD(unreg_list); 1727 LIST_HEAD(wdev_list); 1728 1729 ASSERT_RTNL(); 1730 1731 /* 1732 * Close all AP_VLAN interfaces first, as otherwise they 1733 * might be closed while the AP interface they belong to 1734 * is closed, causing unregister_netdevice_many() to crash. 1735 */ 1736 list_for_each_entry(sdata, &local->interfaces, list) 1737 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1738 dev_close(sdata->dev); 1739 1740 mutex_lock(&local->iflist_mtx); 1741 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1742 list_del(&sdata->list); 1743 1744 if (sdata->dev) 1745 unregister_netdevice_queue(sdata->dev, &unreg_list); 1746 else 1747 list_add(&sdata->list, &wdev_list); 1748 } 1749 mutex_unlock(&local->iflist_mtx); 1750 unregister_netdevice_many(&unreg_list); 1751 list_del(&unreg_list); 1752 1753 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 1754 list_del(&sdata->list); 1755 cfg80211_unregister_wdev(&sdata->wdev); 1756 kfree(sdata); 1757 } 1758 } 1759 1760 static int netdev_notify(struct notifier_block *nb, 1761 unsigned long state, void *ptr) 1762 { 1763 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1764 struct ieee80211_sub_if_data *sdata; 1765 1766 if (state != NETDEV_CHANGENAME) 1767 return 0; 1768 1769 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1770 return 0; 1771 1772 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1773 return 0; 1774 1775 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1776 1777 memcpy(sdata->name, dev->name, IFNAMSIZ); 1778 1779 ieee80211_debugfs_rename_netdev(sdata); 1780 return 0; 1781 } 1782 1783 static struct notifier_block mac80211_netdev_notifier = { 1784 .notifier_call = netdev_notify, 1785 }; 1786 1787 int ieee80211_iface_init(void) 1788 { 1789 return register_netdevice_notifier(&mac80211_netdev_notifier); 1790 } 1791 1792 void ieee80211_iface_exit(void) 1793 { 1794 unregister_netdevice_notifier(&mac80211_netdev_notifier); 1795 } 1796