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->iflist_mtx); 422 rcu_assign_pointer(local->monitor_sdata, sdata); 423 mutex_unlock(&local->iflist_mtx); 424 425 mutex_lock(&local->mtx); 426 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef, 427 IEEE80211_CHANCTX_EXCLUSIVE); 428 mutex_unlock(&local->mtx); 429 if (ret) { 430 mutex_lock(&local->iflist_mtx); 431 rcu_assign_pointer(local->monitor_sdata, NULL); 432 mutex_unlock(&local->iflist_mtx); 433 synchronize_net(); 434 drv_remove_interface(local, sdata); 435 kfree(sdata); 436 return ret; 437 } 438 439 return 0; 440 } 441 442 void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 443 { 444 struct ieee80211_sub_if_data *sdata; 445 446 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 447 return; 448 449 ASSERT_RTNL(); 450 451 mutex_lock(&local->iflist_mtx); 452 453 sdata = rcu_dereference_protected(local->monitor_sdata, 454 lockdep_is_held(&local->iflist_mtx)); 455 if (!sdata) { 456 mutex_unlock(&local->iflist_mtx); 457 return; 458 } 459 460 rcu_assign_pointer(local->monitor_sdata, NULL); 461 mutex_unlock(&local->iflist_mtx); 462 463 synchronize_net(); 464 465 mutex_lock(&local->mtx); 466 ieee80211_vif_release_channel(sdata); 467 mutex_unlock(&local->mtx); 468 469 drv_remove_interface(local, sdata); 470 471 kfree(sdata); 472 } 473 474 /* 475 * NOTE: Be very careful when changing this function, it must NOT return 476 * an error on interface type changes that have been pre-checked, so most 477 * checks should be in ieee80211_check_concurrent_iface. 478 */ 479 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 480 { 481 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 482 struct net_device *dev = wdev->netdev; 483 struct ieee80211_local *local = sdata->local; 484 struct sta_info *sta; 485 u32 changed = 0; 486 int res; 487 u32 hw_reconf_flags = 0; 488 489 switch (sdata->vif.type) { 490 case NL80211_IFTYPE_WDS: 491 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 492 return -ENOLINK; 493 break; 494 case NL80211_IFTYPE_AP_VLAN: { 495 struct ieee80211_sub_if_data *master; 496 497 if (!sdata->bss) 498 return -ENOLINK; 499 500 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 501 502 master = container_of(sdata->bss, 503 struct ieee80211_sub_if_data, u.ap); 504 sdata->control_port_protocol = 505 master->control_port_protocol; 506 sdata->control_port_no_encrypt = 507 master->control_port_no_encrypt; 508 sdata->vif.cab_queue = master->vif.cab_queue; 509 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 510 sizeof(sdata->vif.hw_queue)); 511 break; 512 } 513 case NL80211_IFTYPE_AP: 514 sdata->bss = &sdata->u.ap; 515 break; 516 case NL80211_IFTYPE_MESH_POINT: 517 case NL80211_IFTYPE_STATION: 518 case NL80211_IFTYPE_MONITOR: 519 case NL80211_IFTYPE_ADHOC: 520 case NL80211_IFTYPE_P2P_DEVICE: 521 /* no special treatment */ 522 break; 523 case NL80211_IFTYPE_UNSPECIFIED: 524 case NUM_NL80211_IFTYPES: 525 case NL80211_IFTYPE_P2P_CLIENT: 526 case NL80211_IFTYPE_P2P_GO: 527 /* cannot happen */ 528 WARN_ON(1); 529 break; 530 } 531 532 if (local->open_count == 0) { 533 res = drv_start(local); 534 if (res) 535 goto err_del_bss; 536 /* we're brought up, everything changes */ 537 hw_reconf_flags = ~0; 538 ieee80211_led_radio(local, true); 539 ieee80211_mod_tpt_led_trig(local, 540 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 541 } 542 543 /* 544 * Copy the hopefully now-present MAC address to 545 * this interface, if it has the special null one. 546 */ 547 if (dev && is_zero_ether_addr(dev->dev_addr)) { 548 memcpy(dev->dev_addr, 549 local->hw.wiphy->perm_addr, 550 ETH_ALEN); 551 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 552 553 if (!is_valid_ether_addr(dev->dev_addr)) { 554 res = -EADDRNOTAVAIL; 555 goto err_stop; 556 } 557 } 558 559 switch (sdata->vif.type) { 560 case NL80211_IFTYPE_AP_VLAN: 561 /* no need to tell driver, but set carrier and chanctx */ 562 if (rtnl_dereference(sdata->bss->beacon)) { 563 ieee80211_vif_vlan_copy_chanctx(sdata); 564 netif_carrier_on(dev); 565 } else { 566 netif_carrier_off(dev); 567 } 568 break; 569 case NL80211_IFTYPE_MONITOR: 570 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 571 local->cooked_mntrs++; 572 break; 573 } 574 575 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 576 res = drv_add_interface(local, sdata); 577 if (res) 578 goto err_stop; 579 } else if (local->monitors == 0 && local->open_count == 0) { 580 res = ieee80211_add_virtual_monitor(local); 581 if (res) 582 goto err_stop; 583 } 584 585 /* must be before the call to ieee80211_configure_filter */ 586 local->monitors++; 587 if (local->monitors == 1) { 588 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 589 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 590 } 591 592 ieee80211_adjust_monitor_flags(sdata, 1); 593 ieee80211_configure_filter(local); 594 mutex_lock(&local->mtx); 595 ieee80211_recalc_idle(local); 596 mutex_unlock(&local->mtx); 597 598 netif_carrier_on(dev); 599 break; 600 default: 601 if (coming_up) { 602 ieee80211_del_virtual_monitor(local); 603 604 res = drv_add_interface(local, sdata); 605 if (res) 606 goto err_stop; 607 res = ieee80211_check_queues(sdata, 608 ieee80211_vif_type_p2p(&sdata->vif)); 609 if (res) 610 goto err_del_interface; 611 } 612 613 if (sdata->vif.type == NL80211_IFTYPE_AP) { 614 local->fif_pspoll++; 615 local->fif_probe_req++; 616 617 ieee80211_configure_filter(local); 618 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 619 local->fif_probe_req++; 620 } 621 622 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 623 changed |= ieee80211_reset_erp_info(sdata); 624 ieee80211_bss_info_change_notify(sdata, changed); 625 626 switch (sdata->vif.type) { 627 case NL80211_IFTYPE_STATION: 628 case NL80211_IFTYPE_ADHOC: 629 case NL80211_IFTYPE_AP: 630 case NL80211_IFTYPE_MESH_POINT: 631 netif_carrier_off(dev); 632 break; 633 case NL80211_IFTYPE_WDS: 634 case NL80211_IFTYPE_P2P_DEVICE: 635 break; 636 default: 637 /* not reached */ 638 WARN_ON(1); 639 } 640 641 /* 642 * set default queue parameters so drivers don't 643 * need to initialise the hardware if the hardware 644 * doesn't start up with sane defaults 645 */ 646 ieee80211_set_wmm_default(sdata, true); 647 } 648 649 set_bit(SDATA_STATE_RUNNING, &sdata->state); 650 651 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 652 /* Create STA entry for the WDS peer */ 653 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 654 GFP_KERNEL); 655 if (!sta) { 656 res = -ENOMEM; 657 goto err_del_interface; 658 } 659 660 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 661 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 662 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 663 664 res = sta_info_insert(sta); 665 if (res) { 666 /* STA has been freed */ 667 goto err_del_interface; 668 } 669 670 rate_control_rate_init(sta); 671 netif_carrier_on(dev); 672 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 673 rcu_assign_pointer(local->p2p_sdata, sdata); 674 } 675 676 /* 677 * set_multicast_list will be invoked by the networking core 678 * which will check whether any increments here were done in 679 * error and sync them down to the hardware as filter flags. 680 */ 681 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 682 atomic_inc(&local->iff_allmultis); 683 684 if (sdata->flags & IEEE80211_SDATA_PROMISC) 685 atomic_inc(&local->iff_promiscs); 686 687 if (coming_up) 688 local->open_count++; 689 690 if (hw_reconf_flags) 691 ieee80211_hw_config(local, hw_reconf_flags); 692 693 ieee80211_recalc_ps(local, -1); 694 695 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 696 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 697 /* XXX: for AP_VLAN, actually track AP queues */ 698 netif_tx_start_all_queues(dev); 699 } else if (dev) { 700 unsigned long flags; 701 int n_acs = IEEE80211_NUM_ACS; 702 int ac; 703 704 if (local->hw.queues < IEEE80211_NUM_ACS) 705 n_acs = 1; 706 707 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 708 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE || 709 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 && 710 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) { 711 for (ac = 0; ac < n_acs; ac++) { 712 int ac_queue = sdata->vif.hw_queue[ac]; 713 714 if (local->queue_stop_reasons[ac_queue] == 0 && 715 skb_queue_empty(&local->pending[ac_queue])) 716 netif_start_subqueue(dev, ac); 717 } 718 } 719 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 720 } 721 722 return 0; 723 err_del_interface: 724 drv_remove_interface(local, sdata); 725 err_stop: 726 if (!local->open_count) 727 drv_stop(local); 728 err_del_bss: 729 sdata->bss = NULL; 730 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 731 list_del(&sdata->u.vlan.list); 732 /* might already be clear but that doesn't matter */ 733 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 734 return res; 735 } 736 737 static int ieee80211_open(struct net_device *dev) 738 { 739 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 740 int err; 741 742 /* fail early if user set an invalid address */ 743 if (!is_valid_ether_addr(dev->dev_addr)) 744 return -EADDRNOTAVAIL; 745 746 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 747 if (err) 748 return err; 749 750 return ieee80211_do_open(&sdata->wdev, true); 751 } 752 753 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 754 bool going_down) 755 { 756 struct ieee80211_local *local = sdata->local; 757 unsigned long flags; 758 struct sk_buff *skb, *tmp; 759 u32 hw_reconf_flags = 0; 760 int i, flushed; 761 struct ps_data *ps; 762 struct cfg80211_chan_def chandef; 763 764 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 765 766 if (rcu_access_pointer(local->scan_sdata) == sdata) 767 ieee80211_scan_cancel(local); 768 769 /* 770 * Stop TX on this interface first. 771 */ 772 if (sdata->dev) 773 netif_tx_stop_all_queues(sdata->dev); 774 775 ieee80211_roc_purge(local, sdata); 776 777 switch (sdata->vif.type) { 778 case NL80211_IFTYPE_STATION: 779 ieee80211_mgd_stop(sdata); 780 break; 781 case NL80211_IFTYPE_ADHOC: 782 ieee80211_ibss_stop(sdata); 783 break; 784 case NL80211_IFTYPE_AP: 785 cancel_work_sync(&sdata->u.ap.request_smps_work); 786 break; 787 default: 788 break; 789 } 790 791 /* 792 * Remove all stations associated with this interface. 793 * 794 * This must be done before calling ops->remove_interface() 795 * because otherwise we can later invoke ops->sta_notify() 796 * whenever the STAs are removed, and that invalidates driver 797 * assumptions about always getting a vif pointer that is valid 798 * (because if we remove a STA after ops->remove_interface() 799 * the driver will have removed the vif info already!) 800 * 801 * This is relevant only in WDS mode, in all other modes we've 802 * already removed all stations when disconnecting or similar, 803 * so warn otherwise. 804 */ 805 flushed = sta_info_flush(sdata); 806 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) || 807 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)); 808 809 /* don't count this interface for promisc/allmulti while it is down */ 810 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 811 atomic_dec(&local->iff_allmultis); 812 813 if (sdata->flags & IEEE80211_SDATA_PROMISC) 814 atomic_dec(&local->iff_promiscs); 815 816 if (sdata->vif.type == NL80211_IFTYPE_AP) { 817 local->fif_pspoll--; 818 local->fif_probe_req--; 819 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 820 local->fif_probe_req--; 821 } 822 823 if (sdata->dev) { 824 netif_addr_lock_bh(sdata->dev); 825 spin_lock_bh(&local->filter_lock); 826 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 827 sdata->dev->addr_len); 828 spin_unlock_bh(&local->filter_lock); 829 netif_addr_unlock_bh(sdata->dev); 830 } 831 832 del_timer_sync(&local->dynamic_ps_timer); 833 cancel_work_sync(&local->dynamic_ps_enable_work); 834 835 cancel_work_sync(&sdata->recalc_smps); 836 sdata->vif.csa_active = false; 837 cancel_work_sync(&sdata->csa_finalize_work); 838 839 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); 840 841 if (sdata->wdev.cac_started) { 842 chandef = sdata->vif.bss_conf.chandef; 843 WARN_ON(local->suspended); 844 mutex_lock(&local->mtx); 845 ieee80211_vif_release_channel(sdata); 846 mutex_unlock(&local->mtx); 847 cfg80211_cac_event(sdata->dev, &chandef, 848 NL80211_RADAR_CAC_ABORTED, 849 GFP_KERNEL); 850 } 851 852 /* APs need special treatment */ 853 if (sdata->vif.type == NL80211_IFTYPE_AP) { 854 struct ieee80211_sub_if_data *vlan, *tmpsdata; 855 856 /* down all dependent devices, that is VLANs */ 857 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 858 u.vlan.list) 859 dev_close(vlan->dev); 860 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 861 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 862 /* remove all packets in parent bc_buf pointing to this dev */ 863 ps = &sdata->bss->ps; 864 865 spin_lock_irqsave(&ps->bc_buf.lock, flags); 866 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 867 if (skb->dev == sdata->dev) { 868 __skb_unlink(skb, &ps->bc_buf); 869 local->total_ps_buffered--; 870 ieee80211_free_txskb(&local->hw, skb); 871 } 872 } 873 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 874 } 875 876 if (going_down) 877 local->open_count--; 878 879 switch (sdata->vif.type) { 880 case NL80211_IFTYPE_AP_VLAN: 881 list_del(&sdata->u.vlan.list); 882 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL); 883 /* no need to tell driver */ 884 break; 885 case NL80211_IFTYPE_MONITOR: 886 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 887 local->cooked_mntrs--; 888 break; 889 } 890 891 local->monitors--; 892 if (local->monitors == 0) { 893 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 894 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 895 } 896 897 ieee80211_adjust_monitor_flags(sdata, -1); 898 break; 899 case NL80211_IFTYPE_P2P_DEVICE: 900 /* relies on synchronize_rcu() below */ 901 rcu_assign_pointer(local->p2p_sdata, NULL); 902 /* fall through */ 903 default: 904 cancel_work_sync(&sdata->work); 905 /* 906 * When we get here, the interface is marked down. 907 * Free the remaining keys, if there are any 908 * (shouldn't be, except maybe in WDS mode?) 909 * 910 * Force the key freeing to always synchronize_net() 911 * to wait for the RX path in case it is using this 912 * interface enqueuing frames * at this very time on 913 * another CPU. 914 */ 915 ieee80211_free_keys(sdata, true); 916 917 /* fall through */ 918 case NL80211_IFTYPE_AP: 919 skb_queue_purge(&sdata->skb_queue); 920 } 921 922 sdata->bss = NULL; 923 924 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 925 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 926 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 927 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 928 if (info->control.vif == &sdata->vif) { 929 __skb_unlink(skb, &local->pending[i]); 930 ieee80211_free_txskb(&local->hw, skb); 931 } 932 } 933 } 934 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 935 936 if (local->open_count == 0) 937 ieee80211_clear_tx_pending(local); 938 939 /* 940 * If the interface goes down while suspended, presumably because 941 * the device was unplugged and that happens before our resume, 942 * then the driver is already unconfigured and the remainder of 943 * this function isn't needed. 944 * XXX: what about WoWLAN? If the device has software state, e.g. 945 * memory allocated, it might expect teardown commands from 946 * mac80211 here? 947 */ 948 if (local->suspended) { 949 WARN_ON(local->wowlan); 950 WARN_ON(rtnl_dereference(local->monitor_sdata)); 951 return; 952 } 953 954 switch (sdata->vif.type) { 955 case NL80211_IFTYPE_AP_VLAN: 956 break; 957 case NL80211_IFTYPE_MONITOR: 958 if (local->monitors == 0) 959 ieee80211_del_virtual_monitor(local); 960 961 mutex_lock(&local->mtx); 962 ieee80211_recalc_idle(local); 963 mutex_unlock(&local->mtx); 964 965 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 966 break; 967 968 /* fall through */ 969 default: 970 if (going_down) 971 drv_remove_interface(local, sdata); 972 } 973 974 ieee80211_recalc_ps(local, -1); 975 976 if (local->open_count == 0) { 977 ieee80211_stop_device(local); 978 979 /* no reconfiguring after stop! */ 980 return; 981 } 982 983 /* do after stop to avoid reconfiguring when we stop anyway */ 984 ieee80211_configure_filter(local); 985 ieee80211_hw_config(local, hw_reconf_flags); 986 987 if (local->monitors == local->open_count) 988 ieee80211_add_virtual_monitor(local); 989 } 990 991 static int ieee80211_stop(struct net_device *dev) 992 { 993 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 994 995 ieee80211_do_stop(sdata, true); 996 997 return 0; 998 } 999 1000 static void ieee80211_set_multicast_list(struct net_device *dev) 1001 { 1002 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1003 struct ieee80211_local *local = sdata->local; 1004 int allmulti, promisc, sdata_allmulti, sdata_promisc; 1005 1006 allmulti = !!(dev->flags & IFF_ALLMULTI); 1007 promisc = !!(dev->flags & IFF_PROMISC); 1008 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 1009 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); 1010 1011 if (allmulti != sdata_allmulti) { 1012 if (dev->flags & IFF_ALLMULTI) 1013 atomic_inc(&local->iff_allmultis); 1014 else 1015 atomic_dec(&local->iff_allmultis); 1016 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 1017 } 1018 1019 if (promisc != sdata_promisc) { 1020 if (dev->flags & IFF_PROMISC) 1021 atomic_inc(&local->iff_promiscs); 1022 else 1023 atomic_dec(&local->iff_promiscs); 1024 sdata->flags ^= IEEE80211_SDATA_PROMISC; 1025 } 1026 spin_lock_bh(&local->filter_lock); 1027 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 1028 spin_unlock_bh(&local->filter_lock); 1029 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 1030 } 1031 1032 /* 1033 * Called when the netdev is removed or, by the code below, before 1034 * the interface type changes. 1035 */ 1036 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1037 { 1038 int i; 1039 1040 /* free extra data */ 1041 ieee80211_free_keys(sdata, false); 1042 1043 ieee80211_debugfs_remove_netdev(sdata); 1044 1045 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1046 __skb_queue_purge(&sdata->fragments[i].skb_list); 1047 sdata->fragment_next = 0; 1048 1049 if (ieee80211_vif_is_mesh(&sdata->vif)) 1050 mesh_rmc_free(sdata); 1051 } 1052 1053 static void ieee80211_uninit(struct net_device *dev) 1054 { 1055 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 1056 } 1057 1058 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 1059 struct sk_buff *skb, 1060 void *accel_priv, 1061 select_queue_fallback_t fallback) 1062 { 1063 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 1064 } 1065 1066 static const struct net_device_ops ieee80211_dataif_ops = { 1067 .ndo_open = ieee80211_open, 1068 .ndo_stop = ieee80211_stop, 1069 .ndo_uninit = ieee80211_uninit, 1070 .ndo_start_xmit = ieee80211_subif_start_xmit, 1071 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1072 .ndo_change_mtu = ieee80211_change_mtu, 1073 .ndo_set_mac_address = ieee80211_change_mac, 1074 .ndo_select_queue = ieee80211_netdev_select_queue, 1075 }; 1076 1077 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 1078 struct sk_buff *skb, 1079 void *accel_priv, 1080 select_queue_fallback_t fallback) 1081 { 1082 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1083 struct ieee80211_local *local = sdata->local; 1084 struct ieee80211_hdr *hdr; 1085 struct ieee80211_radiotap_header *rtap = (void *)skb->data; 1086 1087 if (local->hw.queues < IEEE80211_NUM_ACS) 1088 return 0; 1089 1090 if (skb->len < 4 || 1091 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) 1092 return 0; /* doesn't matter, frame will be dropped */ 1093 1094 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); 1095 1096 return ieee80211_select_queue_80211(sdata, skb, hdr); 1097 } 1098 1099 static const struct net_device_ops ieee80211_monitorif_ops = { 1100 .ndo_open = ieee80211_open, 1101 .ndo_stop = ieee80211_stop, 1102 .ndo_uninit = ieee80211_uninit, 1103 .ndo_start_xmit = ieee80211_monitor_start_xmit, 1104 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1105 .ndo_change_mtu = ieee80211_change_mtu, 1106 .ndo_set_mac_address = ieee80211_change_mac, 1107 .ndo_select_queue = ieee80211_monitor_select_queue, 1108 }; 1109 1110 static void ieee80211_if_setup(struct net_device *dev) 1111 { 1112 ether_setup(dev); 1113 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1114 dev->netdev_ops = &ieee80211_dataif_ops; 1115 dev->destructor = free_netdev; 1116 } 1117 1118 static void ieee80211_iface_work(struct work_struct *work) 1119 { 1120 struct ieee80211_sub_if_data *sdata = 1121 container_of(work, struct ieee80211_sub_if_data, work); 1122 struct ieee80211_local *local = sdata->local; 1123 struct sk_buff *skb; 1124 struct sta_info *sta; 1125 struct ieee80211_ra_tid *ra_tid; 1126 1127 if (!ieee80211_sdata_running(sdata)) 1128 return; 1129 1130 if (local->scanning) 1131 return; 1132 1133 /* 1134 * ieee80211_queue_work() should have picked up most cases, 1135 * here we'll pick the rest. 1136 */ 1137 if (WARN(local->suspended, 1138 "interface work scheduled while going to suspend\n")) 1139 return; 1140 1141 /* first process frames */ 1142 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1143 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1144 1145 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { 1146 ra_tid = (void *)&skb->cb; 1147 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, 1148 ra_tid->tid); 1149 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { 1150 ra_tid = (void *)&skb->cb; 1151 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, 1152 ra_tid->tid); 1153 } else if (ieee80211_is_action(mgmt->frame_control) && 1154 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1155 int len = skb->len; 1156 1157 mutex_lock(&local->sta_mtx); 1158 sta = sta_info_get_bss(sdata, mgmt->sa); 1159 if (sta) { 1160 switch (mgmt->u.action.u.addba_req.action_code) { 1161 case WLAN_ACTION_ADDBA_REQ: 1162 ieee80211_process_addba_request( 1163 local, sta, mgmt, len); 1164 break; 1165 case WLAN_ACTION_ADDBA_RESP: 1166 ieee80211_process_addba_resp(local, sta, 1167 mgmt, len); 1168 break; 1169 case WLAN_ACTION_DELBA: 1170 ieee80211_process_delba(sdata, sta, 1171 mgmt, len); 1172 break; 1173 default: 1174 WARN_ON(1); 1175 break; 1176 } 1177 } 1178 mutex_unlock(&local->sta_mtx); 1179 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1180 struct ieee80211_hdr *hdr = (void *)mgmt; 1181 /* 1182 * So the frame isn't mgmt, but frame_control 1183 * is at the right place anyway, of course, so 1184 * the if statement is correct. 1185 * 1186 * Warn if we have other data frame types here, 1187 * they must not get here. 1188 */ 1189 WARN_ON(hdr->frame_control & 1190 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1191 WARN_ON(!(hdr->seq_ctrl & 1192 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1193 /* 1194 * This was a fragment of a frame, received while 1195 * a block-ack session was active. That cannot be 1196 * right, so terminate the session. 1197 */ 1198 mutex_lock(&local->sta_mtx); 1199 sta = sta_info_get_bss(sdata, mgmt->sa); 1200 if (sta) { 1201 u16 tid = *ieee80211_get_qos_ctl(hdr) & 1202 IEEE80211_QOS_CTL_TID_MASK; 1203 1204 __ieee80211_stop_rx_ba_session( 1205 sta, tid, WLAN_BACK_RECIPIENT, 1206 WLAN_REASON_QSTA_REQUIRE_SETUP, 1207 true); 1208 } 1209 mutex_unlock(&local->sta_mtx); 1210 } else switch (sdata->vif.type) { 1211 case NL80211_IFTYPE_STATION: 1212 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1213 break; 1214 case NL80211_IFTYPE_ADHOC: 1215 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1216 break; 1217 case NL80211_IFTYPE_MESH_POINT: 1218 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1219 break; 1220 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1221 break; 1222 default: 1223 WARN(1, "frame for unexpected interface type"); 1224 break; 1225 } 1226 1227 kfree_skb(skb); 1228 } 1229 1230 /* then other type-dependent work */ 1231 switch (sdata->vif.type) { 1232 case NL80211_IFTYPE_STATION: 1233 ieee80211_sta_work(sdata); 1234 break; 1235 case NL80211_IFTYPE_ADHOC: 1236 ieee80211_ibss_work(sdata); 1237 break; 1238 case NL80211_IFTYPE_MESH_POINT: 1239 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1240 break; 1241 ieee80211_mesh_work(sdata); 1242 break; 1243 default: 1244 break; 1245 } 1246 } 1247 1248 static void ieee80211_recalc_smps_work(struct work_struct *work) 1249 { 1250 struct ieee80211_sub_if_data *sdata = 1251 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1252 1253 ieee80211_recalc_smps(sdata); 1254 } 1255 1256 /* 1257 * Helper function to initialise an interface to a specific type. 1258 */ 1259 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1260 enum nl80211_iftype type) 1261 { 1262 /* clear type-dependent union */ 1263 memset(&sdata->u, 0, sizeof(sdata->u)); 1264 1265 /* and set some type-dependent values */ 1266 sdata->vif.type = type; 1267 sdata->vif.p2p = false; 1268 sdata->wdev.iftype = type; 1269 1270 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1271 sdata->control_port_no_encrypt = false; 1272 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1273 1274 sdata->noack_map = 0; 1275 1276 /* only monitor/p2p-device differ */ 1277 if (sdata->dev) { 1278 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1279 sdata->dev->type = ARPHRD_ETHER; 1280 } 1281 1282 skb_queue_head_init(&sdata->skb_queue); 1283 INIT_WORK(&sdata->work, ieee80211_iface_work); 1284 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1285 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work); 1286 1287 switch (type) { 1288 case NL80211_IFTYPE_P2P_GO: 1289 type = NL80211_IFTYPE_AP; 1290 sdata->vif.type = type; 1291 sdata->vif.p2p = true; 1292 /* fall through */ 1293 case NL80211_IFTYPE_AP: 1294 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1295 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1296 INIT_WORK(&sdata->u.ap.request_smps_work, 1297 ieee80211_request_smps_ap_work); 1298 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1299 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF; 1300 break; 1301 case NL80211_IFTYPE_P2P_CLIENT: 1302 type = NL80211_IFTYPE_STATION; 1303 sdata->vif.type = type; 1304 sdata->vif.p2p = true; 1305 /* fall through */ 1306 case NL80211_IFTYPE_STATION: 1307 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1308 ieee80211_sta_setup_sdata(sdata); 1309 break; 1310 case NL80211_IFTYPE_ADHOC: 1311 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1312 ieee80211_ibss_setup_sdata(sdata); 1313 break; 1314 case NL80211_IFTYPE_MESH_POINT: 1315 if (ieee80211_vif_is_mesh(&sdata->vif)) 1316 ieee80211_mesh_init_sdata(sdata); 1317 break; 1318 case NL80211_IFTYPE_MONITOR: 1319 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1320 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1321 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 1322 MONITOR_FLAG_OTHER_BSS; 1323 break; 1324 case NL80211_IFTYPE_WDS: 1325 sdata->vif.bss_conf.bssid = NULL; 1326 break; 1327 case NL80211_IFTYPE_AP_VLAN: 1328 case NL80211_IFTYPE_P2P_DEVICE: 1329 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1330 break; 1331 case NL80211_IFTYPE_UNSPECIFIED: 1332 case NUM_NL80211_IFTYPES: 1333 BUG(); 1334 break; 1335 } 1336 1337 ieee80211_debugfs_add_netdev(sdata); 1338 } 1339 1340 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1341 enum nl80211_iftype type) 1342 { 1343 struct ieee80211_local *local = sdata->local; 1344 int ret, err; 1345 enum nl80211_iftype internal_type = type; 1346 bool p2p = false; 1347 1348 ASSERT_RTNL(); 1349 1350 if (!local->ops->change_interface) 1351 return -EBUSY; 1352 1353 switch (sdata->vif.type) { 1354 case NL80211_IFTYPE_AP: 1355 case NL80211_IFTYPE_STATION: 1356 case NL80211_IFTYPE_ADHOC: 1357 /* 1358 * Could maybe also all others here? 1359 * Just not sure how that interacts 1360 * with the RX/config path e.g. for 1361 * mesh. 1362 */ 1363 break; 1364 default: 1365 return -EBUSY; 1366 } 1367 1368 switch (type) { 1369 case NL80211_IFTYPE_AP: 1370 case NL80211_IFTYPE_STATION: 1371 case NL80211_IFTYPE_ADHOC: 1372 /* 1373 * Could probably support everything 1374 * but WDS here (WDS do_open can fail 1375 * under memory pressure, which this 1376 * code isn't prepared to handle). 1377 */ 1378 break; 1379 case NL80211_IFTYPE_P2P_CLIENT: 1380 p2p = true; 1381 internal_type = NL80211_IFTYPE_STATION; 1382 break; 1383 case NL80211_IFTYPE_P2P_GO: 1384 p2p = true; 1385 internal_type = NL80211_IFTYPE_AP; 1386 break; 1387 default: 1388 return -EBUSY; 1389 } 1390 1391 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1392 if (ret) 1393 return ret; 1394 1395 ieee80211_do_stop(sdata, false); 1396 1397 ieee80211_teardown_sdata(sdata); 1398 1399 ret = drv_change_interface(local, sdata, internal_type, p2p); 1400 if (ret) 1401 type = ieee80211_vif_type_p2p(&sdata->vif); 1402 1403 /* 1404 * Ignore return value here, there's not much we can do since 1405 * the driver changed the interface type internally already. 1406 * The warnings will hopefully make driver authors fix it :-) 1407 */ 1408 ieee80211_check_queues(sdata, type); 1409 1410 ieee80211_setup_sdata(sdata, type); 1411 1412 err = ieee80211_do_open(&sdata->wdev, false); 1413 WARN(err, "type change: do_open returned %d", err); 1414 1415 return ret; 1416 } 1417 1418 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1419 enum nl80211_iftype type) 1420 { 1421 int ret; 1422 1423 ASSERT_RTNL(); 1424 1425 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1426 return 0; 1427 1428 if (ieee80211_sdata_running(sdata)) { 1429 ret = ieee80211_runtime_change_iftype(sdata, type); 1430 if (ret) 1431 return ret; 1432 } else { 1433 /* Purge and reset type-dependent state. */ 1434 ieee80211_teardown_sdata(sdata); 1435 ieee80211_setup_sdata(sdata, type); 1436 } 1437 1438 /* reset some values that shouldn't be kept across type changes */ 1439 sdata->drop_unencrypted = 0; 1440 if (type == NL80211_IFTYPE_STATION) 1441 sdata->u.mgd.use_4addr = false; 1442 1443 return 0; 1444 } 1445 1446 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1447 u8 *perm_addr, enum nl80211_iftype type) 1448 { 1449 struct ieee80211_sub_if_data *sdata; 1450 u64 mask, start, addr, val, inc; 1451 u8 *m; 1452 u8 tmp_addr[ETH_ALEN]; 1453 int i; 1454 1455 /* default ... something at least */ 1456 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1457 1458 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1459 local->hw.wiphy->n_addresses <= 1) 1460 return; 1461 1462 mutex_lock(&local->iflist_mtx); 1463 1464 switch (type) { 1465 case NL80211_IFTYPE_MONITOR: 1466 /* doesn't matter */ 1467 break; 1468 case NL80211_IFTYPE_WDS: 1469 case NL80211_IFTYPE_AP_VLAN: 1470 /* match up with an AP interface */ 1471 list_for_each_entry(sdata, &local->interfaces, list) { 1472 if (sdata->vif.type != NL80211_IFTYPE_AP) 1473 continue; 1474 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1475 break; 1476 } 1477 /* keep default if no AP interface present */ 1478 break; 1479 case NL80211_IFTYPE_P2P_CLIENT: 1480 case NL80211_IFTYPE_P2P_GO: 1481 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) { 1482 list_for_each_entry(sdata, &local->interfaces, list) { 1483 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1484 continue; 1485 if (!ieee80211_sdata_running(sdata)) 1486 continue; 1487 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1488 goto out_unlock; 1489 } 1490 } 1491 /* otherwise fall through */ 1492 default: 1493 /* assign a new address if possible -- try n_addresses first */ 1494 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1495 bool used = false; 1496 1497 list_for_each_entry(sdata, &local->interfaces, list) { 1498 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1499 sdata->vif.addr)) { 1500 used = true; 1501 break; 1502 } 1503 } 1504 1505 if (!used) { 1506 memcpy(perm_addr, 1507 local->hw.wiphy->addresses[i].addr, 1508 ETH_ALEN); 1509 break; 1510 } 1511 } 1512 1513 /* try mask if available */ 1514 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1515 break; 1516 1517 m = local->hw.wiphy->addr_mask; 1518 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1519 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1520 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1521 1522 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1523 /* not a contiguous mask ... not handled now! */ 1524 pr_info("not contiguous\n"); 1525 break; 1526 } 1527 1528 /* 1529 * Pick address of existing interface in case user changed 1530 * MAC address manually, default to perm_addr. 1531 */ 1532 m = local->hw.wiphy->perm_addr; 1533 list_for_each_entry(sdata, &local->interfaces, list) { 1534 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1535 continue; 1536 m = sdata->vif.addr; 1537 break; 1538 } 1539 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1540 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1541 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1542 1543 inc = 1ULL<<__ffs64(mask); 1544 val = (start & mask); 1545 addr = (start & ~mask) | (val & mask); 1546 do { 1547 bool used = false; 1548 1549 tmp_addr[5] = addr >> 0*8; 1550 tmp_addr[4] = addr >> 1*8; 1551 tmp_addr[3] = addr >> 2*8; 1552 tmp_addr[2] = addr >> 3*8; 1553 tmp_addr[1] = addr >> 4*8; 1554 tmp_addr[0] = addr >> 5*8; 1555 1556 val += inc; 1557 1558 list_for_each_entry(sdata, &local->interfaces, list) { 1559 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 1560 used = true; 1561 break; 1562 } 1563 } 1564 1565 if (!used) { 1566 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1567 break; 1568 } 1569 addr = (start & ~mask) | (val & mask); 1570 } while (addr != start); 1571 1572 break; 1573 } 1574 1575 out_unlock: 1576 mutex_unlock(&local->iflist_mtx); 1577 } 1578 1579 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1580 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1581 struct vif_params *params) 1582 { 1583 struct net_device *ndev = NULL; 1584 struct ieee80211_sub_if_data *sdata = NULL; 1585 int ret, i; 1586 int txqs = 1; 1587 1588 ASSERT_RTNL(); 1589 1590 if (type == NL80211_IFTYPE_P2P_DEVICE) { 1591 struct wireless_dev *wdev; 1592 1593 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1594 GFP_KERNEL); 1595 if (!sdata) 1596 return -ENOMEM; 1597 wdev = &sdata->wdev; 1598 1599 sdata->dev = NULL; 1600 strlcpy(sdata->name, name, IFNAMSIZ); 1601 ieee80211_assign_perm_addr(local, wdev->address, type); 1602 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1603 } else { 1604 if (local->hw.queues >= IEEE80211_NUM_ACS) 1605 txqs = IEEE80211_NUM_ACS; 1606 1607 ndev = alloc_netdev_mqs(sizeof(*sdata) + 1608 local->hw.vif_data_size, 1609 name, ieee80211_if_setup, txqs, 1); 1610 if (!ndev) 1611 return -ENOMEM; 1612 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1613 1614 ndev->needed_headroom = local->tx_headroom + 1615 4*6 /* four MAC addresses */ 1616 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1617 + 6 /* mesh */ 1618 + 8 /* rfc1042/bridge tunnel */ 1619 - ETH_HLEN /* ethernet hard_header_len */ 1620 + IEEE80211_ENCRYPT_HEADROOM; 1621 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1622 1623 ret = dev_alloc_name(ndev, ndev->name); 1624 if (ret < 0) { 1625 free_netdev(ndev); 1626 return ret; 1627 } 1628 1629 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1630 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1631 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1632 1633 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1634 sdata = netdev_priv(ndev); 1635 ndev->ieee80211_ptr = &sdata->wdev; 1636 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1637 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1638 1639 sdata->dev = ndev; 1640 } 1641 1642 /* initialise type-independent data */ 1643 sdata->wdev.wiphy = local->hw.wiphy; 1644 sdata->local = local; 1645 1646 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1647 skb_queue_head_init(&sdata->fragments[i].skb_list); 1648 1649 INIT_LIST_HEAD(&sdata->key_list); 1650 1651 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 1652 ieee80211_dfs_cac_timer_work); 1653 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 1654 ieee80211_delayed_tailroom_dec); 1655 1656 for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 1657 struct ieee80211_supported_band *sband; 1658 sband = local->hw.wiphy->bands[i]; 1659 sdata->rc_rateidx_mask[i] = 1660 sband ? (1 << sband->n_bitrates) - 1 : 0; 1661 if (sband) 1662 memcpy(sdata->rc_rateidx_mcs_mask[i], 1663 sband->ht_cap.mcs.rx_mask, 1664 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1665 else 1666 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1667 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1668 } 1669 1670 ieee80211_set_default_queues(sdata); 1671 1672 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1673 sdata->user_power_level = local->user_power_level; 1674 1675 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1676 1677 /* setup type-dependent data */ 1678 ieee80211_setup_sdata(sdata, type); 1679 1680 if (ndev) { 1681 if (params) { 1682 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1683 if (type == NL80211_IFTYPE_STATION) 1684 sdata->u.mgd.use_4addr = params->use_4addr; 1685 } 1686 1687 ndev->features |= local->hw.netdev_features; 1688 1689 ret = register_netdevice(ndev); 1690 if (ret) { 1691 free_netdev(ndev); 1692 return ret; 1693 } 1694 } 1695 1696 mutex_lock(&local->iflist_mtx); 1697 list_add_tail_rcu(&sdata->list, &local->interfaces); 1698 mutex_unlock(&local->iflist_mtx); 1699 1700 if (new_wdev) 1701 *new_wdev = &sdata->wdev; 1702 1703 return 0; 1704 } 1705 1706 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1707 { 1708 ASSERT_RTNL(); 1709 1710 mutex_lock(&sdata->local->iflist_mtx); 1711 list_del_rcu(&sdata->list); 1712 mutex_unlock(&sdata->local->iflist_mtx); 1713 1714 synchronize_rcu(); 1715 1716 if (sdata->dev) { 1717 unregister_netdevice(sdata->dev); 1718 } else { 1719 cfg80211_unregister_wdev(&sdata->wdev); 1720 kfree(sdata); 1721 } 1722 } 1723 1724 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 1725 { 1726 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 1727 return; 1728 ieee80211_do_stop(sdata, true); 1729 ieee80211_teardown_sdata(sdata); 1730 } 1731 1732 /* 1733 * Remove all interfaces, may only be called at hardware unregistration 1734 * time because it doesn't do RCU-safe list removals. 1735 */ 1736 void ieee80211_remove_interfaces(struct ieee80211_local *local) 1737 { 1738 struct ieee80211_sub_if_data *sdata, *tmp; 1739 LIST_HEAD(unreg_list); 1740 LIST_HEAD(wdev_list); 1741 1742 ASSERT_RTNL(); 1743 1744 /* 1745 * Close all AP_VLAN interfaces first, as otherwise they 1746 * might be closed while the AP interface they belong to 1747 * is closed, causing unregister_netdevice_many() to crash. 1748 */ 1749 list_for_each_entry(sdata, &local->interfaces, list) 1750 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1751 dev_close(sdata->dev); 1752 1753 mutex_lock(&local->iflist_mtx); 1754 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1755 list_del(&sdata->list); 1756 1757 if (sdata->dev) 1758 unregister_netdevice_queue(sdata->dev, &unreg_list); 1759 else 1760 list_add(&sdata->list, &wdev_list); 1761 } 1762 mutex_unlock(&local->iflist_mtx); 1763 unregister_netdevice_many(&unreg_list); 1764 list_del(&unreg_list); 1765 1766 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 1767 list_del(&sdata->list); 1768 cfg80211_unregister_wdev(&sdata->wdev); 1769 kfree(sdata); 1770 } 1771 } 1772 1773 static int netdev_notify(struct notifier_block *nb, 1774 unsigned long state, void *ptr) 1775 { 1776 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1777 struct ieee80211_sub_if_data *sdata; 1778 1779 if (state != NETDEV_CHANGENAME) 1780 return 0; 1781 1782 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1783 return 0; 1784 1785 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1786 return 0; 1787 1788 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1789 1790 memcpy(sdata->name, dev->name, IFNAMSIZ); 1791 1792 ieee80211_debugfs_rename_netdev(sdata); 1793 return 0; 1794 } 1795 1796 static struct notifier_block mac80211_netdev_notifier = { 1797 .notifier_call = netdev_notify, 1798 }; 1799 1800 int ieee80211_iface_init(void) 1801 { 1802 return register_netdevice_notifier(&mac80211_netdev_notifier); 1803 } 1804 1805 void ieee80211_iface_exit(void) 1806 { 1807 unregister_netdevice_notifier(&mac80211_netdev_notifier); 1808 } 1809