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 { 1062 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 1063 } 1064 1065 static const struct net_device_ops ieee80211_dataif_ops = { 1066 .ndo_open = ieee80211_open, 1067 .ndo_stop = ieee80211_stop, 1068 .ndo_uninit = ieee80211_uninit, 1069 .ndo_start_xmit = ieee80211_subif_start_xmit, 1070 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1071 .ndo_change_mtu = ieee80211_change_mtu, 1072 .ndo_set_mac_address = ieee80211_change_mac, 1073 .ndo_select_queue = ieee80211_netdev_select_queue, 1074 }; 1075 1076 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 1077 struct sk_buff *skb, 1078 void *accel_priv) 1079 { 1080 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1081 struct ieee80211_local *local = sdata->local; 1082 struct ieee80211_hdr *hdr; 1083 struct ieee80211_radiotap_header *rtap = (void *)skb->data; 1084 1085 if (local->hw.queues < IEEE80211_NUM_ACS) 1086 return 0; 1087 1088 if (skb->len < 4 || 1089 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) 1090 return 0; /* doesn't matter, frame will be dropped */ 1091 1092 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); 1093 1094 return ieee80211_select_queue_80211(sdata, skb, hdr); 1095 } 1096 1097 static const struct net_device_ops ieee80211_monitorif_ops = { 1098 .ndo_open = ieee80211_open, 1099 .ndo_stop = ieee80211_stop, 1100 .ndo_uninit = ieee80211_uninit, 1101 .ndo_start_xmit = ieee80211_monitor_start_xmit, 1102 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1103 .ndo_change_mtu = ieee80211_change_mtu, 1104 .ndo_set_mac_address = ieee80211_change_mac, 1105 .ndo_select_queue = ieee80211_monitor_select_queue, 1106 }; 1107 1108 static void ieee80211_if_setup(struct net_device *dev) 1109 { 1110 ether_setup(dev); 1111 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1112 dev->netdev_ops = &ieee80211_dataif_ops; 1113 dev->destructor = free_netdev; 1114 } 1115 1116 static void ieee80211_iface_work(struct work_struct *work) 1117 { 1118 struct ieee80211_sub_if_data *sdata = 1119 container_of(work, struct ieee80211_sub_if_data, work); 1120 struct ieee80211_local *local = sdata->local; 1121 struct sk_buff *skb; 1122 struct sta_info *sta; 1123 struct ieee80211_ra_tid *ra_tid; 1124 1125 if (!ieee80211_sdata_running(sdata)) 1126 return; 1127 1128 if (local->scanning) 1129 return; 1130 1131 /* 1132 * ieee80211_queue_work() should have picked up most cases, 1133 * here we'll pick the rest. 1134 */ 1135 if (WARN(local->suspended, 1136 "interface work scheduled while going to suspend\n")) 1137 return; 1138 1139 /* first process frames */ 1140 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1141 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1142 1143 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { 1144 ra_tid = (void *)&skb->cb; 1145 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, 1146 ra_tid->tid); 1147 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { 1148 ra_tid = (void *)&skb->cb; 1149 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, 1150 ra_tid->tid); 1151 } else if (ieee80211_is_action(mgmt->frame_control) && 1152 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1153 int len = skb->len; 1154 1155 mutex_lock(&local->sta_mtx); 1156 sta = sta_info_get_bss(sdata, mgmt->sa); 1157 if (sta) { 1158 switch (mgmt->u.action.u.addba_req.action_code) { 1159 case WLAN_ACTION_ADDBA_REQ: 1160 ieee80211_process_addba_request( 1161 local, sta, mgmt, len); 1162 break; 1163 case WLAN_ACTION_ADDBA_RESP: 1164 ieee80211_process_addba_resp(local, sta, 1165 mgmt, len); 1166 break; 1167 case WLAN_ACTION_DELBA: 1168 ieee80211_process_delba(sdata, sta, 1169 mgmt, len); 1170 break; 1171 default: 1172 WARN_ON(1); 1173 break; 1174 } 1175 } 1176 mutex_unlock(&local->sta_mtx); 1177 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1178 struct ieee80211_hdr *hdr = (void *)mgmt; 1179 /* 1180 * So the frame isn't mgmt, but frame_control 1181 * is at the right place anyway, of course, so 1182 * the if statement is correct. 1183 * 1184 * Warn if we have other data frame types here, 1185 * they must not get here. 1186 */ 1187 WARN_ON(hdr->frame_control & 1188 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1189 WARN_ON(!(hdr->seq_ctrl & 1190 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1191 /* 1192 * This was a fragment of a frame, received while 1193 * a block-ack session was active. That cannot be 1194 * right, so terminate the session. 1195 */ 1196 mutex_lock(&local->sta_mtx); 1197 sta = sta_info_get_bss(sdata, mgmt->sa); 1198 if (sta) { 1199 u16 tid = *ieee80211_get_qos_ctl(hdr) & 1200 IEEE80211_QOS_CTL_TID_MASK; 1201 1202 __ieee80211_stop_rx_ba_session( 1203 sta, tid, WLAN_BACK_RECIPIENT, 1204 WLAN_REASON_QSTA_REQUIRE_SETUP, 1205 true); 1206 } 1207 mutex_unlock(&local->sta_mtx); 1208 } else switch (sdata->vif.type) { 1209 case NL80211_IFTYPE_STATION: 1210 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1211 break; 1212 case NL80211_IFTYPE_ADHOC: 1213 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1214 break; 1215 case NL80211_IFTYPE_MESH_POINT: 1216 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1217 break; 1218 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1219 break; 1220 default: 1221 WARN(1, "frame for unexpected interface type"); 1222 break; 1223 } 1224 1225 kfree_skb(skb); 1226 } 1227 1228 /* then other type-dependent work */ 1229 switch (sdata->vif.type) { 1230 case NL80211_IFTYPE_STATION: 1231 ieee80211_sta_work(sdata); 1232 break; 1233 case NL80211_IFTYPE_ADHOC: 1234 ieee80211_ibss_work(sdata); 1235 break; 1236 case NL80211_IFTYPE_MESH_POINT: 1237 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1238 break; 1239 ieee80211_mesh_work(sdata); 1240 break; 1241 default: 1242 break; 1243 } 1244 } 1245 1246 static void ieee80211_recalc_smps_work(struct work_struct *work) 1247 { 1248 struct ieee80211_sub_if_data *sdata = 1249 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1250 1251 ieee80211_recalc_smps(sdata); 1252 } 1253 1254 /* 1255 * Helper function to initialise an interface to a specific type. 1256 */ 1257 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1258 enum nl80211_iftype type) 1259 { 1260 /* clear type-dependent union */ 1261 memset(&sdata->u, 0, sizeof(sdata->u)); 1262 1263 /* and set some type-dependent values */ 1264 sdata->vif.type = type; 1265 sdata->vif.p2p = false; 1266 sdata->wdev.iftype = type; 1267 1268 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1269 sdata->control_port_no_encrypt = false; 1270 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1271 1272 sdata->noack_map = 0; 1273 1274 /* only monitor/p2p-device differ */ 1275 if (sdata->dev) { 1276 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1277 sdata->dev->type = ARPHRD_ETHER; 1278 } 1279 1280 skb_queue_head_init(&sdata->skb_queue); 1281 INIT_WORK(&sdata->work, ieee80211_iface_work); 1282 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1283 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work); 1284 1285 switch (type) { 1286 case NL80211_IFTYPE_P2P_GO: 1287 type = NL80211_IFTYPE_AP; 1288 sdata->vif.type = type; 1289 sdata->vif.p2p = true; 1290 /* fall through */ 1291 case NL80211_IFTYPE_AP: 1292 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1293 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1294 INIT_WORK(&sdata->u.ap.request_smps_work, 1295 ieee80211_request_smps_ap_work); 1296 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1297 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF; 1298 break; 1299 case NL80211_IFTYPE_P2P_CLIENT: 1300 type = NL80211_IFTYPE_STATION; 1301 sdata->vif.type = type; 1302 sdata->vif.p2p = true; 1303 /* fall through */ 1304 case NL80211_IFTYPE_STATION: 1305 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1306 ieee80211_sta_setup_sdata(sdata); 1307 break; 1308 case NL80211_IFTYPE_ADHOC: 1309 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1310 ieee80211_ibss_setup_sdata(sdata); 1311 break; 1312 case NL80211_IFTYPE_MESH_POINT: 1313 if (ieee80211_vif_is_mesh(&sdata->vif)) 1314 ieee80211_mesh_init_sdata(sdata); 1315 break; 1316 case NL80211_IFTYPE_MONITOR: 1317 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1318 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1319 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 1320 MONITOR_FLAG_OTHER_BSS; 1321 break; 1322 case NL80211_IFTYPE_WDS: 1323 sdata->vif.bss_conf.bssid = NULL; 1324 break; 1325 case NL80211_IFTYPE_AP_VLAN: 1326 case NL80211_IFTYPE_P2P_DEVICE: 1327 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1328 break; 1329 case NL80211_IFTYPE_UNSPECIFIED: 1330 case NUM_NL80211_IFTYPES: 1331 BUG(); 1332 break; 1333 } 1334 1335 ieee80211_debugfs_add_netdev(sdata); 1336 } 1337 1338 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1339 enum nl80211_iftype type) 1340 { 1341 struct ieee80211_local *local = sdata->local; 1342 int ret, err; 1343 enum nl80211_iftype internal_type = type; 1344 bool p2p = false; 1345 1346 ASSERT_RTNL(); 1347 1348 if (!local->ops->change_interface) 1349 return -EBUSY; 1350 1351 switch (sdata->vif.type) { 1352 case NL80211_IFTYPE_AP: 1353 case NL80211_IFTYPE_STATION: 1354 case NL80211_IFTYPE_ADHOC: 1355 /* 1356 * Could maybe also all others here? 1357 * Just not sure how that interacts 1358 * with the RX/config path e.g. for 1359 * mesh. 1360 */ 1361 break; 1362 default: 1363 return -EBUSY; 1364 } 1365 1366 switch (type) { 1367 case NL80211_IFTYPE_AP: 1368 case NL80211_IFTYPE_STATION: 1369 case NL80211_IFTYPE_ADHOC: 1370 /* 1371 * Could probably support everything 1372 * but WDS here (WDS do_open can fail 1373 * under memory pressure, which this 1374 * code isn't prepared to handle). 1375 */ 1376 break; 1377 case NL80211_IFTYPE_P2P_CLIENT: 1378 p2p = true; 1379 internal_type = NL80211_IFTYPE_STATION; 1380 break; 1381 case NL80211_IFTYPE_P2P_GO: 1382 p2p = true; 1383 internal_type = NL80211_IFTYPE_AP; 1384 break; 1385 default: 1386 return -EBUSY; 1387 } 1388 1389 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1390 if (ret) 1391 return ret; 1392 1393 ieee80211_do_stop(sdata, false); 1394 1395 ieee80211_teardown_sdata(sdata); 1396 1397 ret = drv_change_interface(local, sdata, internal_type, p2p); 1398 if (ret) 1399 type = ieee80211_vif_type_p2p(&sdata->vif); 1400 1401 /* 1402 * Ignore return value here, there's not much we can do since 1403 * the driver changed the interface type internally already. 1404 * The warnings will hopefully make driver authors fix it :-) 1405 */ 1406 ieee80211_check_queues(sdata, type); 1407 1408 ieee80211_setup_sdata(sdata, type); 1409 1410 err = ieee80211_do_open(&sdata->wdev, false); 1411 WARN(err, "type change: do_open returned %d", err); 1412 1413 return ret; 1414 } 1415 1416 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1417 enum nl80211_iftype type) 1418 { 1419 int ret; 1420 1421 ASSERT_RTNL(); 1422 1423 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1424 return 0; 1425 1426 if (ieee80211_sdata_running(sdata)) { 1427 ret = ieee80211_runtime_change_iftype(sdata, type); 1428 if (ret) 1429 return ret; 1430 } else { 1431 /* Purge and reset type-dependent state. */ 1432 ieee80211_teardown_sdata(sdata); 1433 ieee80211_setup_sdata(sdata, type); 1434 } 1435 1436 /* reset some values that shouldn't be kept across type changes */ 1437 sdata->drop_unencrypted = 0; 1438 if (type == NL80211_IFTYPE_STATION) 1439 sdata->u.mgd.use_4addr = false; 1440 1441 return 0; 1442 } 1443 1444 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1445 u8 *perm_addr, enum nl80211_iftype type) 1446 { 1447 struct ieee80211_sub_if_data *sdata; 1448 u64 mask, start, addr, val, inc; 1449 u8 *m; 1450 u8 tmp_addr[ETH_ALEN]; 1451 int i; 1452 1453 /* default ... something at least */ 1454 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1455 1456 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1457 local->hw.wiphy->n_addresses <= 1) 1458 return; 1459 1460 mutex_lock(&local->iflist_mtx); 1461 1462 switch (type) { 1463 case NL80211_IFTYPE_MONITOR: 1464 /* doesn't matter */ 1465 break; 1466 case NL80211_IFTYPE_WDS: 1467 case NL80211_IFTYPE_AP_VLAN: 1468 /* match up with an AP interface */ 1469 list_for_each_entry(sdata, &local->interfaces, list) { 1470 if (sdata->vif.type != NL80211_IFTYPE_AP) 1471 continue; 1472 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1473 break; 1474 } 1475 /* keep default if no AP interface present */ 1476 break; 1477 case NL80211_IFTYPE_P2P_CLIENT: 1478 case NL80211_IFTYPE_P2P_GO: 1479 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) { 1480 list_for_each_entry(sdata, &local->interfaces, list) { 1481 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1482 continue; 1483 if (!ieee80211_sdata_running(sdata)) 1484 continue; 1485 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1486 goto out_unlock; 1487 } 1488 } 1489 /* otherwise fall through */ 1490 default: 1491 /* assign a new address if possible -- try n_addresses first */ 1492 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1493 bool used = false; 1494 1495 list_for_each_entry(sdata, &local->interfaces, list) { 1496 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1497 sdata->vif.addr)) { 1498 used = true; 1499 break; 1500 } 1501 } 1502 1503 if (!used) { 1504 memcpy(perm_addr, 1505 local->hw.wiphy->addresses[i].addr, 1506 ETH_ALEN); 1507 break; 1508 } 1509 } 1510 1511 /* try mask if available */ 1512 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1513 break; 1514 1515 m = local->hw.wiphy->addr_mask; 1516 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1517 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1518 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1519 1520 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1521 /* not a contiguous mask ... not handled now! */ 1522 pr_info("not contiguous\n"); 1523 break; 1524 } 1525 1526 /* 1527 * Pick address of existing interface in case user changed 1528 * MAC address manually, default to perm_addr. 1529 */ 1530 m = local->hw.wiphy->perm_addr; 1531 list_for_each_entry(sdata, &local->interfaces, list) { 1532 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1533 continue; 1534 m = sdata->vif.addr; 1535 break; 1536 } 1537 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1538 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1539 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1540 1541 inc = 1ULL<<__ffs64(mask); 1542 val = (start & mask); 1543 addr = (start & ~mask) | (val & mask); 1544 do { 1545 bool used = false; 1546 1547 tmp_addr[5] = addr >> 0*8; 1548 tmp_addr[4] = addr >> 1*8; 1549 tmp_addr[3] = addr >> 2*8; 1550 tmp_addr[2] = addr >> 3*8; 1551 tmp_addr[1] = addr >> 4*8; 1552 tmp_addr[0] = addr >> 5*8; 1553 1554 val += inc; 1555 1556 list_for_each_entry(sdata, &local->interfaces, list) { 1557 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 1558 used = true; 1559 break; 1560 } 1561 } 1562 1563 if (!used) { 1564 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1565 break; 1566 } 1567 addr = (start & ~mask) | (val & mask); 1568 } while (addr != start); 1569 1570 break; 1571 } 1572 1573 out_unlock: 1574 mutex_unlock(&local->iflist_mtx); 1575 } 1576 1577 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1578 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1579 struct vif_params *params) 1580 { 1581 struct net_device *ndev = NULL; 1582 struct ieee80211_sub_if_data *sdata = NULL; 1583 int ret, i; 1584 int txqs = 1; 1585 1586 ASSERT_RTNL(); 1587 1588 if (type == NL80211_IFTYPE_P2P_DEVICE) { 1589 struct wireless_dev *wdev; 1590 1591 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1592 GFP_KERNEL); 1593 if (!sdata) 1594 return -ENOMEM; 1595 wdev = &sdata->wdev; 1596 1597 sdata->dev = NULL; 1598 strlcpy(sdata->name, name, IFNAMSIZ); 1599 ieee80211_assign_perm_addr(local, wdev->address, type); 1600 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1601 } else { 1602 if (local->hw.queues >= IEEE80211_NUM_ACS) 1603 txqs = IEEE80211_NUM_ACS; 1604 1605 ndev = alloc_netdev_mqs(sizeof(*sdata) + 1606 local->hw.vif_data_size, 1607 name, ieee80211_if_setup, txqs, 1); 1608 if (!ndev) 1609 return -ENOMEM; 1610 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1611 1612 ndev->needed_headroom = local->tx_headroom + 1613 4*6 /* four MAC addresses */ 1614 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1615 + 6 /* mesh */ 1616 + 8 /* rfc1042/bridge tunnel */ 1617 - ETH_HLEN /* ethernet hard_header_len */ 1618 + IEEE80211_ENCRYPT_HEADROOM; 1619 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1620 1621 ret = dev_alloc_name(ndev, ndev->name); 1622 if (ret < 0) { 1623 free_netdev(ndev); 1624 return ret; 1625 } 1626 1627 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1628 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1629 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1630 1631 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1632 sdata = netdev_priv(ndev); 1633 ndev->ieee80211_ptr = &sdata->wdev; 1634 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1635 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1636 1637 sdata->dev = ndev; 1638 } 1639 1640 /* initialise type-independent data */ 1641 sdata->wdev.wiphy = local->hw.wiphy; 1642 sdata->local = local; 1643 1644 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1645 skb_queue_head_init(&sdata->fragments[i].skb_list); 1646 1647 INIT_LIST_HEAD(&sdata->key_list); 1648 1649 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 1650 ieee80211_dfs_cac_timer_work); 1651 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 1652 ieee80211_delayed_tailroom_dec); 1653 1654 for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 1655 struct ieee80211_supported_band *sband; 1656 sband = local->hw.wiphy->bands[i]; 1657 sdata->rc_rateidx_mask[i] = 1658 sband ? (1 << sband->n_bitrates) - 1 : 0; 1659 if (sband) 1660 memcpy(sdata->rc_rateidx_mcs_mask[i], 1661 sband->ht_cap.mcs.rx_mask, 1662 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1663 else 1664 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1665 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1666 } 1667 1668 ieee80211_set_default_queues(sdata); 1669 1670 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1671 sdata->user_power_level = local->user_power_level; 1672 1673 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1674 1675 /* setup type-dependent data */ 1676 ieee80211_setup_sdata(sdata, type); 1677 1678 if (ndev) { 1679 if (params) { 1680 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1681 if (type == NL80211_IFTYPE_STATION) 1682 sdata->u.mgd.use_4addr = params->use_4addr; 1683 } 1684 1685 ndev->features |= local->hw.netdev_features; 1686 1687 ret = register_netdevice(ndev); 1688 if (ret) { 1689 free_netdev(ndev); 1690 return ret; 1691 } 1692 } 1693 1694 mutex_lock(&local->iflist_mtx); 1695 list_add_tail_rcu(&sdata->list, &local->interfaces); 1696 mutex_unlock(&local->iflist_mtx); 1697 1698 if (new_wdev) 1699 *new_wdev = &sdata->wdev; 1700 1701 return 0; 1702 } 1703 1704 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1705 { 1706 ASSERT_RTNL(); 1707 1708 mutex_lock(&sdata->local->iflist_mtx); 1709 list_del_rcu(&sdata->list); 1710 mutex_unlock(&sdata->local->iflist_mtx); 1711 1712 synchronize_rcu(); 1713 1714 if (sdata->dev) { 1715 unregister_netdevice(sdata->dev); 1716 } else { 1717 cfg80211_unregister_wdev(&sdata->wdev); 1718 kfree(sdata); 1719 } 1720 } 1721 1722 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 1723 { 1724 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 1725 return; 1726 ieee80211_do_stop(sdata, true); 1727 ieee80211_teardown_sdata(sdata); 1728 } 1729 1730 /* 1731 * Remove all interfaces, may only be called at hardware unregistration 1732 * time because it doesn't do RCU-safe list removals. 1733 */ 1734 void ieee80211_remove_interfaces(struct ieee80211_local *local) 1735 { 1736 struct ieee80211_sub_if_data *sdata, *tmp; 1737 LIST_HEAD(unreg_list); 1738 LIST_HEAD(wdev_list); 1739 1740 ASSERT_RTNL(); 1741 1742 /* 1743 * Close all AP_VLAN interfaces first, as otherwise they 1744 * might be closed while the AP interface they belong to 1745 * is closed, causing unregister_netdevice_many() to crash. 1746 */ 1747 list_for_each_entry(sdata, &local->interfaces, list) 1748 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1749 dev_close(sdata->dev); 1750 1751 mutex_lock(&local->iflist_mtx); 1752 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1753 list_del(&sdata->list); 1754 1755 if (sdata->dev) 1756 unregister_netdevice_queue(sdata->dev, &unreg_list); 1757 else 1758 list_add(&sdata->list, &wdev_list); 1759 } 1760 mutex_unlock(&local->iflist_mtx); 1761 unregister_netdevice_many(&unreg_list); 1762 list_del(&unreg_list); 1763 1764 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 1765 list_del(&sdata->list); 1766 cfg80211_unregister_wdev(&sdata->wdev); 1767 kfree(sdata); 1768 } 1769 } 1770 1771 static int netdev_notify(struct notifier_block *nb, 1772 unsigned long state, void *ptr) 1773 { 1774 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1775 struct ieee80211_sub_if_data *sdata; 1776 1777 if (state != NETDEV_CHANGENAME) 1778 return 0; 1779 1780 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1781 return 0; 1782 1783 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1784 return 0; 1785 1786 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1787 1788 memcpy(sdata->name, dev->name, IFNAMSIZ); 1789 1790 ieee80211_debugfs_rename_netdev(sdata); 1791 return 0; 1792 } 1793 1794 static struct notifier_block mac80211_netdev_notifier = { 1795 .notifier_call = netdev_notify, 1796 }; 1797 1798 int ieee80211_iface_init(void) 1799 { 1800 return register_netdevice_notifier(&mac80211_netdev_notifier); 1801 } 1802 1803 void ieee80211_iface_exit(void) 1804 { 1805 unregister_netdevice_notifier(&mac80211_netdev_notifier); 1806 } 1807