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, scanning, active; 105 unsigned int led_trig_start = 0, led_trig_stop = 0; 106 107 lockdep_assert_held(&local->mtx); 108 109 active = force_active || 110 !list_empty(&local->chanctx_list) || 111 local->monitors; 112 113 working = !local->ops->remain_on_channel && 114 !list_empty(&local->roc_list); 115 116 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 117 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 118 119 if (working || scanning) 120 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 121 else 122 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 123 124 if (active) 125 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 126 else 127 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 128 129 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 130 131 if (working || scanning || active) 132 return __ieee80211_idle_off(local); 133 return __ieee80211_idle_on(local); 134 } 135 136 u32 ieee80211_idle_off(struct ieee80211_local *local) 137 { 138 return __ieee80211_recalc_idle(local, true); 139 } 140 141 void ieee80211_recalc_idle(struct ieee80211_local *local) 142 { 143 u32 change = __ieee80211_recalc_idle(local, false); 144 if (change) 145 ieee80211_hw_config(local, change); 146 } 147 148 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) 149 { 150 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) 151 return -EINVAL; 152 153 dev->mtu = new_mtu; 154 return 0; 155 } 156 157 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr, 158 bool check_dup) 159 { 160 struct ieee80211_local *local = sdata->local; 161 struct ieee80211_sub_if_data *iter; 162 u64 new, mask, tmp; 163 u8 *m; 164 int ret = 0; 165 166 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 167 return 0; 168 169 m = addr; 170 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 171 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 172 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 173 174 m = local->hw.wiphy->addr_mask; 175 mask = ((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 if (!check_dup) 180 return ret; 181 182 mutex_lock(&local->iflist_mtx); 183 list_for_each_entry(iter, &local->interfaces, list) { 184 if (iter == sdata) 185 continue; 186 187 if (iter->vif.type == NL80211_IFTYPE_MONITOR && 188 !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 189 continue; 190 191 m = iter->vif.addr; 192 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 193 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 194 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 195 196 if ((new & ~mask) != (tmp & ~mask)) { 197 ret = -EINVAL; 198 break; 199 } 200 } 201 mutex_unlock(&local->iflist_mtx); 202 203 return ret; 204 } 205 206 static int ieee80211_change_mac(struct net_device *dev, void *addr) 207 { 208 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 209 struct sockaddr *sa = addr; 210 bool check_dup = true; 211 int ret; 212 213 if (ieee80211_sdata_running(sdata)) 214 return -EBUSY; 215 216 if (sdata->vif.type == NL80211_IFTYPE_MONITOR && 217 !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 218 check_dup = false; 219 220 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup); 221 if (ret) 222 return ret; 223 224 ret = eth_mac_addr(dev, sa); 225 226 if (ret == 0) 227 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 228 229 return ret; 230 } 231 232 static inline int identical_mac_addr_allowed(int type1, int type2) 233 { 234 return type1 == NL80211_IFTYPE_MONITOR || 235 type2 == NL80211_IFTYPE_MONITOR || 236 type1 == NL80211_IFTYPE_P2P_DEVICE || 237 type2 == NL80211_IFTYPE_P2P_DEVICE || 238 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || 239 (type1 == NL80211_IFTYPE_WDS && 240 (type2 == NL80211_IFTYPE_WDS || 241 type2 == NL80211_IFTYPE_AP)) || 242 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 243 (type1 == NL80211_IFTYPE_AP_VLAN && 244 (type2 == NL80211_IFTYPE_AP || 245 type2 == NL80211_IFTYPE_AP_VLAN)); 246 } 247 248 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 249 enum nl80211_iftype iftype) 250 { 251 struct ieee80211_local *local = sdata->local; 252 struct ieee80211_sub_if_data *nsdata; 253 int ret; 254 255 ASSERT_RTNL(); 256 257 /* we hold the RTNL here so can safely walk the list */ 258 list_for_each_entry(nsdata, &local->interfaces, list) { 259 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 260 /* 261 * Allow only a single IBSS interface to be up at any 262 * time. This is restricted because beacon distribution 263 * cannot work properly if both are in the same IBSS. 264 * 265 * To remove this restriction we'd have to disallow them 266 * from setting the same SSID on different IBSS interfaces 267 * belonging to the same hardware. Then, however, we're 268 * faced with having to adopt two different TSF timers... 269 */ 270 if (iftype == NL80211_IFTYPE_ADHOC && 271 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 272 return -EBUSY; 273 /* 274 * will not add another interface while any channel 275 * switch is active. 276 */ 277 if (nsdata->vif.csa_active) 278 return -EBUSY; 279 280 /* 281 * The remaining checks are only performed for interfaces 282 * with the same MAC address. 283 */ 284 if (!ether_addr_equal(sdata->vif.addr, 285 nsdata->vif.addr)) 286 continue; 287 288 /* 289 * check whether it may have the same address 290 */ 291 if (!identical_mac_addr_allowed(iftype, 292 nsdata->vif.type)) 293 return -ENOTUNIQ; 294 295 /* 296 * can only add VLANs to enabled APs 297 */ 298 if (iftype == NL80211_IFTYPE_AP_VLAN && 299 nsdata->vif.type == NL80211_IFTYPE_AP) 300 sdata->bss = &nsdata->u.ap; 301 } 302 } 303 304 mutex_lock(&local->chanctx_mtx); 305 ret = ieee80211_check_combinations(sdata, NULL, 0, 0); 306 mutex_unlock(&local->chanctx_mtx); 307 return ret; 308 } 309 310 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata, 311 enum nl80211_iftype iftype) 312 { 313 int n_queues = sdata->local->hw.queues; 314 int i; 315 316 if (iftype != NL80211_IFTYPE_P2P_DEVICE) { 317 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 318 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 319 IEEE80211_INVAL_HW_QUEUE)) 320 return -EINVAL; 321 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 322 n_queues)) 323 return -EINVAL; 324 } 325 } 326 327 if ((iftype != NL80211_IFTYPE_AP && 328 iftype != NL80211_IFTYPE_P2P_GO && 329 iftype != NL80211_IFTYPE_MESH_POINT) || 330 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) { 331 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 332 return 0; 333 } 334 335 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 336 return -EINVAL; 337 338 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 339 return -EINVAL; 340 341 return 0; 342 } 343 344 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 345 const int offset) 346 { 347 struct ieee80211_local *local = sdata->local; 348 u32 flags = sdata->u.mntr_flags; 349 350 #define ADJUST(_f, _s) do { \ 351 if (flags & MONITOR_FLAG_##_f) \ 352 local->fif_##_s += offset; \ 353 } while (0) 354 355 ADJUST(FCSFAIL, fcsfail); 356 ADJUST(PLCPFAIL, plcpfail); 357 ADJUST(CONTROL, control); 358 ADJUST(CONTROL, pspoll); 359 ADJUST(OTHER_BSS, other_bss); 360 361 #undef ADJUST 362 } 363 364 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 365 { 366 struct ieee80211_local *local = sdata->local; 367 int i; 368 369 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 370 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 371 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 372 else if (local->hw.queues >= IEEE80211_NUM_ACS) 373 sdata->vif.hw_queue[i] = i; 374 else 375 sdata->vif.hw_queue[i] = 0; 376 } 377 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 378 } 379 380 int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 381 { 382 struct ieee80211_sub_if_data *sdata; 383 int ret; 384 385 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 386 return 0; 387 388 ASSERT_RTNL(); 389 390 if (local->monitor_sdata) 391 return 0; 392 393 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 394 if (!sdata) 395 return -ENOMEM; 396 397 /* set up data */ 398 sdata->local = local; 399 sdata->vif.type = NL80211_IFTYPE_MONITOR; 400 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 401 wiphy_name(local->hw.wiphy)); 402 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; 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_INIT_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_INIT_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 mutex_lock(&local->mtx); 501 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 502 mutex_unlock(&local->mtx); 503 504 master = container_of(sdata->bss, 505 struct ieee80211_sub_if_data, u.ap); 506 sdata->control_port_protocol = 507 master->control_port_protocol; 508 sdata->control_port_no_encrypt = 509 master->control_port_no_encrypt; 510 sdata->vif.cab_queue = master->vif.cab_queue; 511 memcpy(sdata->vif.hw_queue, master->vif.hw_queue, 512 sizeof(sdata->vif.hw_queue)); 513 break; 514 } 515 case NL80211_IFTYPE_AP: 516 sdata->bss = &sdata->u.ap; 517 break; 518 case NL80211_IFTYPE_MESH_POINT: 519 case NL80211_IFTYPE_STATION: 520 case NL80211_IFTYPE_MONITOR: 521 case NL80211_IFTYPE_ADHOC: 522 case NL80211_IFTYPE_P2P_DEVICE: 523 /* no special treatment */ 524 break; 525 case NL80211_IFTYPE_UNSPECIFIED: 526 case NUM_NL80211_IFTYPES: 527 case NL80211_IFTYPE_P2P_CLIENT: 528 case NL80211_IFTYPE_P2P_GO: 529 /* cannot happen */ 530 WARN_ON(1); 531 break; 532 } 533 534 if (local->open_count == 0) { 535 res = drv_start(local); 536 if (res) 537 goto err_del_bss; 538 /* we're brought up, everything changes */ 539 hw_reconf_flags = ~0; 540 ieee80211_led_radio(local, true); 541 ieee80211_mod_tpt_led_trig(local, 542 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 543 } 544 545 /* 546 * Copy the hopefully now-present MAC address to 547 * this interface, if it has the special null one. 548 */ 549 if (dev && is_zero_ether_addr(dev->dev_addr)) { 550 memcpy(dev->dev_addr, 551 local->hw.wiphy->perm_addr, 552 ETH_ALEN); 553 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 554 555 if (!is_valid_ether_addr(dev->dev_addr)) { 556 res = -EADDRNOTAVAIL; 557 goto err_stop; 558 } 559 } 560 561 switch (sdata->vif.type) { 562 case NL80211_IFTYPE_AP_VLAN: 563 /* no need to tell driver, but set carrier and chanctx */ 564 if (rtnl_dereference(sdata->bss->beacon)) { 565 ieee80211_vif_vlan_copy_chanctx(sdata); 566 netif_carrier_on(dev); 567 } else { 568 netif_carrier_off(dev); 569 } 570 break; 571 case NL80211_IFTYPE_MONITOR: 572 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 573 local->cooked_mntrs++; 574 break; 575 } 576 577 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 578 res = drv_add_interface(local, sdata); 579 if (res) 580 goto err_stop; 581 } else if (local->monitors == 0 && local->open_count == 0) { 582 res = ieee80211_add_virtual_monitor(local); 583 if (res) 584 goto err_stop; 585 } 586 587 /* must be before the call to ieee80211_configure_filter */ 588 local->monitors++; 589 if (local->monitors == 1) { 590 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 591 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 592 } 593 594 ieee80211_adjust_monitor_flags(sdata, 1); 595 ieee80211_configure_filter(local); 596 mutex_lock(&local->mtx); 597 ieee80211_recalc_idle(local); 598 mutex_unlock(&local->mtx); 599 600 netif_carrier_on(dev); 601 break; 602 default: 603 if (coming_up) { 604 ieee80211_del_virtual_monitor(local); 605 606 res = drv_add_interface(local, sdata); 607 if (res) 608 goto err_stop; 609 res = ieee80211_check_queues(sdata, 610 ieee80211_vif_type_p2p(&sdata->vif)); 611 if (res) 612 goto err_del_interface; 613 } 614 615 if (sdata->vif.type == NL80211_IFTYPE_AP) { 616 local->fif_pspoll++; 617 local->fif_probe_req++; 618 619 ieee80211_configure_filter(local); 620 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 621 local->fif_probe_req++; 622 } 623 624 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 625 changed |= ieee80211_reset_erp_info(sdata); 626 ieee80211_bss_info_change_notify(sdata, changed); 627 628 switch (sdata->vif.type) { 629 case NL80211_IFTYPE_STATION: 630 case NL80211_IFTYPE_ADHOC: 631 case NL80211_IFTYPE_AP: 632 case NL80211_IFTYPE_MESH_POINT: 633 netif_carrier_off(dev); 634 break; 635 case NL80211_IFTYPE_WDS: 636 case NL80211_IFTYPE_P2P_DEVICE: 637 break; 638 default: 639 /* not reached */ 640 WARN_ON(1); 641 } 642 643 /* 644 * set default queue parameters so drivers don't 645 * need to initialise the hardware if the hardware 646 * doesn't start up with sane defaults 647 */ 648 ieee80211_set_wmm_default(sdata, true); 649 } 650 651 set_bit(SDATA_STATE_RUNNING, &sdata->state); 652 653 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 654 /* Create STA entry for the WDS peer */ 655 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 656 GFP_KERNEL); 657 if (!sta) { 658 res = -ENOMEM; 659 goto err_del_interface; 660 } 661 662 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 663 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 664 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 665 666 res = sta_info_insert(sta); 667 if (res) { 668 /* STA has been freed */ 669 goto err_del_interface; 670 } 671 672 rate_control_rate_init(sta); 673 netif_carrier_on(dev); 674 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 675 rcu_assign_pointer(local->p2p_sdata, sdata); 676 } 677 678 /* 679 * set_multicast_list will be invoked by the networking core 680 * which will check whether any increments here were done in 681 * error and sync them down to the hardware as filter flags. 682 */ 683 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 684 atomic_inc(&local->iff_allmultis); 685 686 if (sdata->flags & IEEE80211_SDATA_PROMISC) 687 atomic_inc(&local->iff_promiscs); 688 689 if (coming_up) 690 local->open_count++; 691 692 if (hw_reconf_flags) 693 ieee80211_hw_config(local, hw_reconf_flags); 694 695 ieee80211_recalc_ps(local, -1); 696 697 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 698 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 699 /* XXX: for AP_VLAN, actually track AP queues */ 700 netif_tx_start_all_queues(dev); 701 } else if (dev) { 702 unsigned long flags; 703 int n_acs = IEEE80211_NUM_ACS; 704 int ac; 705 706 if (local->hw.queues < IEEE80211_NUM_ACS) 707 n_acs = 1; 708 709 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 710 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE || 711 (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 && 712 skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) { 713 for (ac = 0; ac < n_acs; ac++) { 714 int ac_queue = sdata->vif.hw_queue[ac]; 715 716 if (local->queue_stop_reasons[ac_queue] == 0 && 717 skb_queue_empty(&local->pending[ac_queue])) 718 netif_start_subqueue(dev, ac); 719 } 720 } 721 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 722 } 723 724 return 0; 725 err_del_interface: 726 drv_remove_interface(local, sdata); 727 err_stop: 728 if (!local->open_count) 729 drv_stop(local); 730 err_del_bss: 731 sdata->bss = NULL; 732 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 733 mutex_lock(&local->mtx); 734 list_del(&sdata->u.vlan.list); 735 mutex_unlock(&local->mtx); 736 } 737 /* might already be clear but that doesn't matter */ 738 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 739 return res; 740 } 741 742 static int ieee80211_open(struct net_device *dev) 743 { 744 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 745 int err; 746 747 /* fail early if user set an invalid address */ 748 if (!is_valid_ether_addr(dev->dev_addr)) 749 return -EADDRNOTAVAIL; 750 751 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 752 if (err) 753 return err; 754 755 return ieee80211_do_open(&sdata->wdev, true); 756 } 757 758 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 759 bool going_down) 760 { 761 struct ieee80211_local *local = sdata->local; 762 unsigned long flags; 763 struct sk_buff *skb, *tmp; 764 u32 hw_reconf_flags = 0; 765 int i, flushed; 766 struct ps_data *ps; 767 struct cfg80211_chan_def chandef; 768 769 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 770 771 if (rcu_access_pointer(local->scan_sdata) == sdata) 772 ieee80211_scan_cancel(local); 773 774 /* 775 * Stop TX on this interface first. 776 */ 777 if (sdata->dev) 778 netif_tx_stop_all_queues(sdata->dev); 779 780 ieee80211_roc_purge(local, sdata); 781 782 switch (sdata->vif.type) { 783 case NL80211_IFTYPE_STATION: 784 ieee80211_mgd_stop(sdata); 785 break; 786 case NL80211_IFTYPE_ADHOC: 787 ieee80211_ibss_stop(sdata); 788 break; 789 case NL80211_IFTYPE_AP: 790 cancel_work_sync(&sdata->u.ap.request_smps_work); 791 break; 792 default: 793 break; 794 } 795 796 /* 797 * Remove all stations associated with this interface. 798 * 799 * This must be done before calling ops->remove_interface() 800 * because otherwise we can later invoke ops->sta_notify() 801 * whenever the STAs are removed, and that invalidates driver 802 * assumptions about always getting a vif pointer that is valid 803 * (because if we remove a STA after ops->remove_interface() 804 * the driver will have removed the vif info already!) 805 * 806 * This is relevant only in WDS mode, in all other modes we've 807 * already removed all stations when disconnecting or similar, 808 * so warn otherwise. 809 */ 810 flushed = sta_info_flush(sdata); 811 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) || 812 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)); 813 814 /* don't count this interface for promisc/allmulti while it is down */ 815 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 816 atomic_dec(&local->iff_allmultis); 817 818 if (sdata->flags & IEEE80211_SDATA_PROMISC) 819 atomic_dec(&local->iff_promiscs); 820 821 if (sdata->vif.type == NL80211_IFTYPE_AP) { 822 local->fif_pspoll--; 823 local->fif_probe_req--; 824 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 825 local->fif_probe_req--; 826 } 827 828 if (sdata->dev) { 829 netif_addr_lock_bh(sdata->dev); 830 spin_lock_bh(&local->filter_lock); 831 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 832 sdata->dev->addr_len); 833 spin_unlock_bh(&local->filter_lock); 834 netif_addr_unlock_bh(sdata->dev); 835 } 836 837 del_timer_sync(&local->dynamic_ps_timer); 838 cancel_work_sync(&local->dynamic_ps_enable_work); 839 840 cancel_work_sync(&sdata->recalc_smps); 841 sdata_lock(sdata); 842 mutex_lock(&local->mtx); 843 sdata->vif.csa_active = false; 844 if (!ieee80211_csa_needs_block_tx(local)) 845 ieee80211_wake_queues_by_reason(&local->hw, 846 IEEE80211_MAX_QUEUE_MAP, 847 IEEE80211_QUEUE_STOP_REASON_CSA); 848 mutex_unlock(&local->mtx); 849 sdata_unlock(sdata); 850 851 cancel_work_sync(&sdata->csa_finalize_work); 852 853 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); 854 855 if (sdata->wdev.cac_started) { 856 chandef = sdata->vif.bss_conf.chandef; 857 WARN_ON(local->suspended); 858 mutex_lock(&local->mtx); 859 ieee80211_vif_release_channel(sdata); 860 mutex_unlock(&local->mtx); 861 cfg80211_cac_event(sdata->dev, &chandef, 862 NL80211_RADAR_CAC_ABORTED, 863 GFP_KERNEL); 864 } 865 866 /* APs need special treatment */ 867 if (sdata->vif.type == NL80211_IFTYPE_AP) { 868 struct ieee80211_sub_if_data *vlan, *tmpsdata; 869 870 /* down all dependent devices, that is VLANs */ 871 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 872 u.vlan.list) 873 dev_close(vlan->dev); 874 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 875 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 876 /* remove all packets in parent bc_buf pointing to this dev */ 877 ps = &sdata->bss->ps; 878 879 spin_lock_irqsave(&ps->bc_buf.lock, flags); 880 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 881 if (skb->dev == sdata->dev) { 882 __skb_unlink(skb, &ps->bc_buf); 883 local->total_ps_buffered--; 884 ieee80211_free_txskb(&local->hw, skb); 885 } 886 } 887 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 888 } 889 890 if (going_down) 891 local->open_count--; 892 893 switch (sdata->vif.type) { 894 case NL80211_IFTYPE_AP_VLAN: 895 mutex_lock(&local->mtx); 896 list_del(&sdata->u.vlan.list); 897 mutex_unlock(&local->mtx); 898 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL); 899 /* no need to tell driver */ 900 break; 901 case NL80211_IFTYPE_MONITOR: 902 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 903 local->cooked_mntrs--; 904 break; 905 } 906 907 local->monitors--; 908 if (local->monitors == 0) { 909 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 910 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 911 } 912 913 ieee80211_adjust_monitor_flags(sdata, -1); 914 break; 915 case NL80211_IFTYPE_P2P_DEVICE: 916 /* relies on synchronize_rcu() below */ 917 RCU_INIT_POINTER(local->p2p_sdata, NULL); 918 /* fall through */ 919 default: 920 cancel_work_sync(&sdata->work); 921 /* 922 * When we get here, the interface is marked down. 923 * Free the remaining keys, if there are any 924 * (shouldn't be, except maybe in WDS mode?) 925 * 926 * Force the key freeing to always synchronize_net() 927 * to wait for the RX path in case it is using this 928 * interface enqueuing frames * at this very time on 929 * another CPU. 930 */ 931 ieee80211_free_keys(sdata, true); 932 933 /* fall through */ 934 case NL80211_IFTYPE_AP: 935 skb_queue_purge(&sdata->skb_queue); 936 } 937 938 sdata->bss = NULL; 939 940 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 941 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 942 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 943 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 944 if (info->control.vif == &sdata->vif) { 945 __skb_unlink(skb, &local->pending[i]); 946 ieee80211_free_txskb(&local->hw, skb); 947 } 948 } 949 } 950 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 951 952 if (local->open_count == 0) 953 ieee80211_clear_tx_pending(local); 954 955 /* 956 * If the interface goes down while suspended, presumably because 957 * the device was unplugged and that happens before our resume, 958 * then the driver is already unconfigured and the remainder of 959 * this function isn't needed. 960 * XXX: what about WoWLAN? If the device has software state, e.g. 961 * memory allocated, it might expect teardown commands from 962 * mac80211 here? 963 */ 964 if (local->suspended) { 965 WARN_ON(local->wowlan); 966 WARN_ON(rtnl_dereference(local->monitor_sdata)); 967 return; 968 } 969 970 switch (sdata->vif.type) { 971 case NL80211_IFTYPE_AP_VLAN: 972 break; 973 case NL80211_IFTYPE_MONITOR: 974 if (local->monitors == 0) 975 ieee80211_del_virtual_monitor(local); 976 977 mutex_lock(&local->mtx); 978 ieee80211_recalc_idle(local); 979 mutex_unlock(&local->mtx); 980 981 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 982 break; 983 984 /* fall through */ 985 default: 986 if (going_down) 987 drv_remove_interface(local, sdata); 988 } 989 990 ieee80211_recalc_ps(local, -1); 991 992 if (local->open_count == 0) { 993 ieee80211_stop_device(local); 994 995 /* no reconfiguring after stop! */ 996 return; 997 } 998 999 /* do after stop to avoid reconfiguring when we stop anyway */ 1000 ieee80211_configure_filter(local); 1001 ieee80211_hw_config(local, hw_reconf_flags); 1002 1003 if (local->monitors == local->open_count) 1004 ieee80211_add_virtual_monitor(local); 1005 } 1006 1007 static int ieee80211_stop(struct net_device *dev) 1008 { 1009 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1010 1011 ieee80211_do_stop(sdata, true); 1012 1013 return 0; 1014 } 1015 1016 static void ieee80211_set_multicast_list(struct net_device *dev) 1017 { 1018 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1019 struct ieee80211_local *local = sdata->local; 1020 int allmulti, promisc, sdata_allmulti, sdata_promisc; 1021 1022 allmulti = !!(dev->flags & IFF_ALLMULTI); 1023 promisc = !!(dev->flags & IFF_PROMISC); 1024 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 1025 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); 1026 1027 if (allmulti != sdata_allmulti) { 1028 if (dev->flags & IFF_ALLMULTI) 1029 atomic_inc(&local->iff_allmultis); 1030 else 1031 atomic_dec(&local->iff_allmultis); 1032 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 1033 } 1034 1035 if (promisc != sdata_promisc) { 1036 if (dev->flags & IFF_PROMISC) 1037 atomic_inc(&local->iff_promiscs); 1038 else 1039 atomic_dec(&local->iff_promiscs); 1040 sdata->flags ^= IEEE80211_SDATA_PROMISC; 1041 } 1042 spin_lock_bh(&local->filter_lock); 1043 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 1044 spin_unlock_bh(&local->filter_lock); 1045 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 1046 } 1047 1048 /* 1049 * Called when the netdev is removed or, by the code below, before 1050 * the interface type changes. 1051 */ 1052 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1053 { 1054 int i; 1055 1056 /* free extra data */ 1057 ieee80211_free_keys(sdata, false); 1058 1059 ieee80211_debugfs_remove_netdev(sdata); 1060 1061 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1062 __skb_queue_purge(&sdata->fragments[i].skb_list); 1063 sdata->fragment_next = 0; 1064 1065 if (ieee80211_vif_is_mesh(&sdata->vif)) 1066 mesh_rmc_free(sdata); 1067 } 1068 1069 static void ieee80211_uninit(struct net_device *dev) 1070 { 1071 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 1072 } 1073 1074 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 1075 struct sk_buff *skb, 1076 void *accel_priv, 1077 select_queue_fallback_t fallback) 1078 { 1079 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 1080 } 1081 1082 static const struct net_device_ops ieee80211_dataif_ops = { 1083 .ndo_open = ieee80211_open, 1084 .ndo_stop = ieee80211_stop, 1085 .ndo_uninit = ieee80211_uninit, 1086 .ndo_start_xmit = ieee80211_subif_start_xmit, 1087 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1088 .ndo_change_mtu = ieee80211_change_mtu, 1089 .ndo_set_mac_address = ieee80211_change_mac, 1090 .ndo_select_queue = ieee80211_netdev_select_queue, 1091 }; 1092 1093 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 1094 struct sk_buff *skb, 1095 void *accel_priv, 1096 select_queue_fallback_t fallback) 1097 { 1098 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1099 struct ieee80211_local *local = sdata->local; 1100 struct ieee80211_hdr *hdr; 1101 struct ieee80211_radiotap_header *rtap = (void *)skb->data; 1102 1103 if (local->hw.queues < IEEE80211_NUM_ACS) 1104 return 0; 1105 1106 if (skb->len < 4 || 1107 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) 1108 return 0; /* doesn't matter, frame will be dropped */ 1109 1110 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); 1111 1112 return ieee80211_select_queue_80211(sdata, skb, hdr); 1113 } 1114 1115 static const struct net_device_ops ieee80211_monitorif_ops = { 1116 .ndo_open = ieee80211_open, 1117 .ndo_stop = ieee80211_stop, 1118 .ndo_uninit = ieee80211_uninit, 1119 .ndo_start_xmit = ieee80211_monitor_start_xmit, 1120 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1121 .ndo_change_mtu = ieee80211_change_mtu, 1122 .ndo_set_mac_address = ieee80211_change_mac, 1123 .ndo_select_queue = ieee80211_monitor_select_queue, 1124 }; 1125 1126 static void ieee80211_if_setup(struct net_device *dev) 1127 { 1128 ether_setup(dev); 1129 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1130 dev->netdev_ops = &ieee80211_dataif_ops; 1131 dev->destructor = free_netdev; 1132 } 1133 1134 static void ieee80211_iface_work(struct work_struct *work) 1135 { 1136 struct ieee80211_sub_if_data *sdata = 1137 container_of(work, struct ieee80211_sub_if_data, work); 1138 struct ieee80211_local *local = sdata->local; 1139 struct sk_buff *skb; 1140 struct sta_info *sta; 1141 struct ieee80211_ra_tid *ra_tid; 1142 1143 if (!ieee80211_sdata_running(sdata)) 1144 return; 1145 1146 if (local->scanning) 1147 return; 1148 1149 /* 1150 * ieee80211_queue_work() should have picked up most cases, 1151 * here we'll pick the rest. 1152 */ 1153 if (WARN(local->suspended, 1154 "interface work scheduled while going to suspend\n")) 1155 return; 1156 1157 /* first process frames */ 1158 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1159 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1160 1161 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { 1162 ra_tid = (void *)&skb->cb; 1163 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, 1164 ra_tid->tid); 1165 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { 1166 ra_tid = (void *)&skb->cb; 1167 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, 1168 ra_tid->tid); 1169 } else if (ieee80211_is_action(mgmt->frame_control) && 1170 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1171 int len = skb->len; 1172 1173 mutex_lock(&local->sta_mtx); 1174 sta = sta_info_get_bss(sdata, mgmt->sa); 1175 if (sta) { 1176 switch (mgmt->u.action.u.addba_req.action_code) { 1177 case WLAN_ACTION_ADDBA_REQ: 1178 ieee80211_process_addba_request( 1179 local, sta, mgmt, len); 1180 break; 1181 case WLAN_ACTION_ADDBA_RESP: 1182 ieee80211_process_addba_resp(local, sta, 1183 mgmt, len); 1184 break; 1185 case WLAN_ACTION_DELBA: 1186 ieee80211_process_delba(sdata, sta, 1187 mgmt, len); 1188 break; 1189 default: 1190 WARN_ON(1); 1191 break; 1192 } 1193 } 1194 mutex_unlock(&local->sta_mtx); 1195 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1196 struct ieee80211_hdr *hdr = (void *)mgmt; 1197 /* 1198 * So the frame isn't mgmt, but frame_control 1199 * is at the right place anyway, of course, so 1200 * the if statement is correct. 1201 * 1202 * Warn if we have other data frame types here, 1203 * they must not get here. 1204 */ 1205 WARN_ON(hdr->frame_control & 1206 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1207 WARN_ON(!(hdr->seq_ctrl & 1208 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1209 /* 1210 * This was a fragment of a frame, received while 1211 * a block-ack session was active. That cannot be 1212 * right, so terminate the session. 1213 */ 1214 mutex_lock(&local->sta_mtx); 1215 sta = sta_info_get_bss(sdata, mgmt->sa); 1216 if (sta) { 1217 u16 tid = *ieee80211_get_qos_ctl(hdr) & 1218 IEEE80211_QOS_CTL_TID_MASK; 1219 1220 __ieee80211_stop_rx_ba_session( 1221 sta, tid, WLAN_BACK_RECIPIENT, 1222 WLAN_REASON_QSTA_REQUIRE_SETUP, 1223 true); 1224 } 1225 mutex_unlock(&local->sta_mtx); 1226 } else switch (sdata->vif.type) { 1227 case NL80211_IFTYPE_STATION: 1228 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1229 break; 1230 case NL80211_IFTYPE_ADHOC: 1231 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1232 break; 1233 case NL80211_IFTYPE_MESH_POINT: 1234 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1235 break; 1236 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1237 break; 1238 default: 1239 WARN(1, "frame for unexpected interface type"); 1240 break; 1241 } 1242 1243 kfree_skb(skb); 1244 } 1245 1246 /* then other type-dependent work */ 1247 switch (sdata->vif.type) { 1248 case NL80211_IFTYPE_STATION: 1249 ieee80211_sta_work(sdata); 1250 break; 1251 case NL80211_IFTYPE_ADHOC: 1252 ieee80211_ibss_work(sdata); 1253 break; 1254 case NL80211_IFTYPE_MESH_POINT: 1255 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1256 break; 1257 ieee80211_mesh_work(sdata); 1258 break; 1259 default: 1260 break; 1261 } 1262 } 1263 1264 static void ieee80211_recalc_smps_work(struct work_struct *work) 1265 { 1266 struct ieee80211_sub_if_data *sdata = 1267 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1268 1269 ieee80211_recalc_smps(sdata); 1270 } 1271 1272 /* 1273 * Helper function to initialise an interface to a specific type. 1274 */ 1275 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1276 enum nl80211_iftype type) 1277 { 1278 /* clear type-dependent union */ 1279 memset(&sdata->u, 0, sizeof(sdata->u)); 1280 1281 /* and set some type-dependent values */ 1282 sdata->vif.type = type; 1283 sdata->vif.p2p = false; 1284 sdata->wdev.iftype = type; 1285 1286 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1287 sdata->control_port_no_encrypt = false; 1288 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1289 sdata->vif.bss_conf.idle = true; 1290 1291 sdata->noack_map = 0; 1292 1293 /* only monitor/p2p-device differ */ 1294 if (sdata->dev) { 1295 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1296 sdata->dev->type = ARPHRD_ETHER; 1297 } 1298 1299 skb_queue_head_init(&sdata->skb_queue); 1300 INIT_WORK(&sdata->work, ieee80211_iface_work); 1301 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1302 INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work); 1303 INIT_LIST_HEAD(&sdata->assigned_chanctx_list); 1304 INIT_LIST_HEAD(&sdata->reserved_chanctx_list); 1305 1306 switch (type) { 1307 case NL80211_IFTYPE_P2P_GO: 1308 type = NL80211_IFTYPE_AP; 1309 sdata->vif.type = type; 1310 sdata->vif.p2p = true; 1311 /* fall through */ 1312 case NL80211_IFTYPE_AP: 1313 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1314 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1315 INIT_WORK(&sdata->u.ap.request_smps_work, 1316 ieee80211_request_smps_ap_work); 1317 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1318 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF; 1319 break; 1320 case NL80211_IFTYPE_P2P_CLIENT: 1321 type = NL80211_IFTYPE_STATION; 1322 sdata->vif.type = type; 1323 sdata->vif.p2p = true; 1324 /* fall through */ 1325 case NL80211_IFTYPE_STATION: 1326 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1327 ieee80211_sta_setup_sdata(sdata); 1328 break; 1329 case NL80211_IFTYPE_ADHOC: 1330 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1331 ieee80211_ibss_setup_sdata(sdata); 1332 break; 1333 case NL80211_IFTYPE_MESH_POINT: 1334 if (ieee80211_vif_is_mesh(&sdata->vif)) 1335 ieee80211_mesh_init_sdata(sdata); 1336 break; 1337 case NL80211_IFTYPE_MONITOR: 1338 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1339 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1340 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 1341 MONITOR_FLAG_OTHER_BSS; 1342 break; 1343 case NL80211_IFTYPE_WDS: 1344 sdata->vif.bss_conf.bssid = NULL; 1345 break; 1346 case NL80211_IFTYPE_AP_VLAN: 1347 case NL80211_IFTYPE_P2P_DEVICE: 1348 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1349 break; 1350 case NL80211_IFTYPE_UNSPECIFIED: 1351 case NUM_NL80211_IFTYPES: 1352 BUG(); 1353 break; 1354 } 1355 1356 ieee80211_debugfs_add_netdev(sdata); 1357 } 1358 1359 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1360 enum nl80211_iftype type) 1361 { 1362 struct ieee80211_local *local = sdata->local; 1363 int ret, err; 1364 enum nl80211_iftype internal_type = type; 1365 bool p2p = false; 1366 1367 ASSERT_RTNL(); 1368 1369 if (!local->ops->change_interface) 1370 return -EBUSY; 1371 1372 switch (sdata->vif.type) { 1373 case NL80211_IFTYPE_AP: 1374 case NL80211_IFTYPE_STATION: 1375 case NL80211_IFTYPE_ADHOC: 1376 /* 1377 * Could maybe also all others here? 1378 * Just not sure how that interacts 1379 * with the RX/config path e.g. for 1380 * mesh. 1381 */ 1382 break; 1383 default: 1384 return -EBUSY; 1385 } 1386 1387 switch (type) { 1388 case NL80211_IFTYPE_AP: 1389 case NL80211_IFTYPE_STATION: 1390 case NL80211_IFTYPE_ADHOC: 1391 /* 1392 * Could probably support everything 1393 * but WDS here (WDS do_open can fail 1394 * under memory pressure, which this 1395 * code isn't prepared to handle). 1396 */ 1397 break; 1398 case NL80211_IFTYPE_P2P_CLIENT: 1399 p2p = true; 1400 internal_type = NL80211_IFTYPE_STATION; 1401 break; 1402 case NL80211_IFTYPE_P2P_GO: 1403 p2p = true; 1404 internal_type = NL80211_IFTYPE_AP; 1405 break; 1406 default: 1407 return -EBUSY; 1408 } 1409 1410 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1411 if (ret) 1412 return ret; 1413 1414 ieee80211_do_stop(sdata, false); 1415 1416 ieee80211_teardown_sdata(sdata); 1417 1418 ret = drv_change_interface(local, sdata, internal_type, p2p); 1419 if (ret) 1420 type = ieee80211_vif_type_p2p(&sdata->vif); 1421 1422 /* 1423 * Ignore return value here, there's not much we can do since 1424 * the driver changed the interface type internally already. 1425 * The warnings will hopefully make driver authors fix it :-) 1426 */ 1427 ieee80211_check_queues(sdata, type); 1428 1429 ieee80211_setup_sdata(sdata, type); 1430 1431 err = ieee80211_do_open(&sdata->wdev, false); 1432 WARN(err, "type change: do_open returned %d", err); 1433 1434 return ret; 1435 } 1436 1437 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1438 enum nl80211_iftype type) 1439 { 1440 int ret; 1441 1442 ASSERT_RTNL(); 1443 1444 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1445 return 0; 1446 1447 if (ieee80211_sdata_running(sdata)) { 1448 ret = ieee80211_runtime_change_iftype(sdata, type); 1449 if (ret) 1450 return ret; 1451 } else { 1452 /* Purge and reset type-dependent state. */ 1453 ieee80211_teardown_sdata(sdata); 1454 ieee80211_setup_sdata(sdata, type); 1455 } 1456 1457 /* reset some values that shouldn't be kept across type changes */ 1458 sdata->drop_unencrypted = 0; 1459 if (type == NL80211_IFTYPE_STATION) 1460 sdata->u.mgd.use_4addr = false; 1461 1462 return 0; 1463 } 1464 1465 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1466 u8 *perm_addr, enum nl80211_iftype type) 1467 { 1468 struct ieee80211_sub_if_data *sdata; 1469 u64 mask, start, addr, val, inc; 1470 u8 *m; 1471 u8 tmp_addr[ETH_ALEN]; 1472 int i; 1473 1474 /* default ... something at least */ 1475 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1476 1477 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1478 local->hw.wiphy->n_addresses <= 1) 1479 return; 1480 1481 mutex_lock(&local->iflist_mtx); 1482 1483 switch (type) { 1484 case NL80211_IFTYPE_MONITOR: 1485 /* doesn't matter */ 1486 break; 1487 case NL80211_IFTYPE_WDS: 1488 case NL80211_IFTYPE_AP_VLAN: 1489 /* match up with an AP interface */ 1490 list_for_each_entry(sdata, &local->interfaces, list) { 1491 if (sdata->vif.type != NL80211_IFTYPE_AP) 1492 continue; 1493 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1494 break; 1495 } 1496 /* keep default if no AP interface present */ 1497 break; 1498 case NL80211_IFTYPE_P2P_CLIENT: 1499 case NL80211_IFTYPE_P2P_GO: 1500 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) { 1501 list_for_each_entry(sdata, &local->interfaces, list) { 1502 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1503 continue; 1504 if (!ieee80211_sdata_running(sdata)) 1505 continue; 1506 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1507 goto out_unlock; 1508 } 1509 } 1510 /* otherwise fall through */ 1511 default: 1512 /* assign a new address if possible -- try n_addresses first */ 1513 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1514 bool used = false; 1515 1516 list_for_each_entry(sdata, &local->interfaces, list) { 1517 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr, 1518 sdata->vif.addr)) { 1519 used = true; 1520 break; 1521 } 1522 } 1523 1524 if (!used) { 1525 memcpy(perm_addr, 1526 local->hw.wiphy->addresses[i].addr, 1527 ETH_ALEN); 1528 break; 1529 } 1530 } 1531 1532 /* try mask if available */ 1533 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1534 break; 1535 1536 m = local->hw.wiphy->addr_mask; 1537 mask = ((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 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1542 /* not a contiguous mask ... not handled now! */ 1543 pr_info("not contiguous\n"); 1544 break; 1545 } 1546 1547 /* 1548 * Pick address of existing interface in case user changed 1549 * MAC address manually, default to perm_addr. 1550 */ 1551 m = local->hw.wiphy->perm_addr; 1552 list_for_each_entry(sdata, &local->interfaces, list) { 1553 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1554 continue; 1555 m = sdata->vif.addr; 1556 break; 1557 } 1558 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1559 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1560 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1561 1562 inc = 1ULL<<__ffs64(mask); 1563 val = (start & mask); 1564 addr = (start & ~mask) | (val & mask); 1565 do { 1566 bool used = false; 1567 1568 tmp_addr[5] = addr >> 0*8; 1569 tmp_addr[4] = addr >> 1*8; 1570 tmp_addr[3] = addr >> 2*8; 1571 tmp_addr[2] = addr >> 3*8; 1572 tmp_addr[1] = addr >> 4*8; 1573 tmp_addr[0] = addr >> 5*8; 1574 1575 val += inc; 1576 1577 list_for_each_entry(sdata, &local->interfaces, list) { 1578 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) { 1579 used = true; 1580 break; 1581 } 1582 } 1583 1584 if (!used) { 1585 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1586 break; 1587 } 1588 addr = (start & ~mask) | (val & mask); 1589 } while (addr != start); 1590 1591 break; 1592 } 1593 1594 out_unlock: 1595 mutex_unlock(&local->iflist_mtx); 1596 } 1597 1598 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1599 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1600 struct vif_params *params) 1601 { 1602 struct net_device *ndev = NULL; 1603 struct ieee80211_sub_if_data *sdata = NULL; 1604 int ret, i; 1605 int txqs = 1; 1606 1607 ASSERT_RTNL(); 1608 1609 if (type == NL80211_IFTYPE_P2P_DEVICE) { 1610 struct wireless_dev *wdev; 1611 1612 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1613 GFP_KERNEL); 1614 if (!sdata) 1615 return -ENOMEM; 1616 wdev = &sdata->wdev; 1617 1618 sdata->dev = NULL; 1619 strlcpy(sdata->name, name, IFNAMSIZ); 1620 ieee80211_assign_perm_addr(local, wdev->address, type); 1621 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1622 } else { 1623 if (local->hw.queues >= IEEE80211_NUM_ACS) 1624 txqs = IEEE80211_NUM_ACS; 1625 1626 ndev = alloc_netdev_mqs(sizeof(*sdata) + 1627 local->hw.vif_data_size, 1628 name, ieee80211_if_setup, txqs, 1); 1629 if (!ndev) 1630 return -ENOMEM; 1631 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1632 1633 ndev->needed_headroom = local->tx_headroom + 1634 4*6 /* four MAC addresses */ 1635 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1636 + 6 /* mesh */ 1637 + 8 /* rfc1042/bridge tunnel */ 1638 - ETH_HLEN /* ethernet hard_header_len */ 1639 + IEEE80211_ENCRYPT_HEADROOM; 1640 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1641 1642 ret = dev_alloc_name(ndev, ndev->name); 1643 if (ret < 0) { 1644 free_netdev(ndev); 1645 return ret; 1646 } 1647 1648 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1649 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1650 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1651 1652 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1653 sdata = netdev_priv(ndev); 1654 ndev->ieee80211_ptr = &sdata->wdev; 1655 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1656 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1657 1658 sdata->dev = ndev; 1659 } 1660 1661 /* initialise type-independent data */ 1662 sdata->wdev.wiphy = local->hw.wiphy; 1663 sdata->local = local; 1664 1665 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1666 skb_queue_head_init(&sdata->fragments[i].skb_list); 1667 1668 INIT_LIST_HEAD(&sdata->key_list); 1669 1670 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 1671 ieee80211_dfs_cac_timer_work); 1672 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 1673 ieee80211_delayed_tailroom_dec); 1674 1675 for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 1676 struct ieee80211_supported_band *sband; 1677 sband = local->hw.wiphy->bands[i]; 1678 sdata->rc_rateidx_mask[i] = 1679 sband ? (1 << sband->n_bitrates) - 1 : 0; 1680 if (sband) 1681 memcpy(sdata->rc_rateidx_mcs_mask[i], 1682 sband->ht_cap.mcs.rx_mask, 1683 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1684 else 1685 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1686 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1687 } 1688 1689 ieee80211_set_default_queues(sdata); 1690 1691 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1692 sdata->user_power_level = local->user_power_level; 1693 1694 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1695 1696 /* setup type-dependent data */ 1697 ieee80211_setup_sdata(sdata, type); 1698 1699 if (ndev) { 1700 if (params) { 1701 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1702 if (type == NL80211_IFTYPE_STATION) 1703 sdata->u.mgd.use_4addr = params->use_4addr; 1704 } 1705 1706 ndev->features |= local->hw.netdev_features; 1707 1708 ret = register_netdevice(ndev); 1709 if (ret) { 1710 free_netdev(ndev); 1711 return ret; 1712 } 1713 } 1714 1715 mutex_lock(&local->iflist_mtx); 1716 list_add_tail_rcu(&sdata->list, &local->interfaces); 1717 mutex_unlock(&local->iflist_mtx); 1718 1719 if (new_wdev) 1720 *new_wdev = &sdata->wdev; 1721 1722 return 0; 1723 } 1724 1725 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1726 { 1727 ASSERT_RTNL(); 1728 1729 mutex_lock(&sdata->local->iflist_mtx); 1730 list_del_rcu(&sdata->list); 1731 mutex_unlock(&sdata->local->iflist_mtx); 1732 1733 synchronize_rcu(); 1734 1735 if (sdata->dev) { 1736 unregister_netdevice(sdata->dev); 1737 } else { 1738 cfg80211_unregister_wdev(&sdata->wdev); 1739 kfree(sdata); 1740 } 1741 } 1742 1743 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 1744 { 1745 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 1746 return; 1747 ieee80211_do_stop(sdata, true); 1748 ieee80211_teardown_sdata(sdata); 1749 } 1750 1751 /* 1752 * Remove all interfaces, may only be called at hardware unregistration 1753 * time because it doesn't do RCU-safe list removals. 1754 */ 1755 void ieee80211_remove_interfaces(struct ieee80211_local *local) 1756 { 1757 struct ieee80211_sub_if_data *sdata, *tmp; 1758 LIST_HEAD(unreg_list); 1759 LIST_HEAD(wdev_list); 1760 1761 ASSERT_RTNL(); 1762 1763 /* 1764 * Close all AP_VLAN interfaces first, as otherwise they 1765 * might be closed while the AP interface they belong to 1766 * is closed, causing unregister_netdevice_many() to crash. 1767 */ 1768 list_for_each_entry(sdata, &local->interfaces, list) 1769 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1770 dev_close(sdata->dev); 1771 1772 mutex_lock(&local->iflist_mtx); 1773 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1774 list_del(&sdata->list); 1775 1776 if (sdata->dev) 1777 unregister_netdevice_queue(sdata->dev, &unreg_list); 1778 else 1779 list_add(&sdata->list, &wdev_list); 1780 } 1781 mutex_unlock(&local->iflist_mtx); 1782 unregister_netdevice_many(&unreg_list); 1783 1784 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 1785 list_del(&sdata->list); 1786 cfg80211_unregister_wdev(&sdata->wdev); 1787 kfree(sdata); 1788 } 1789 } 1790 1791 static int netdev_notify(struct notifier_block *nb, 1792 unsigned long state, void *ptr) 1793 { 1794 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1795 struct ieee80211_sub_if_data *sdata; 1796 1797 if (state != NETDEV_CHANGENAME) 1798 return NOTIFY_DONE; 1799 1800 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1801 return NOTIFY_DONE; 1802 1803 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1804 return NOTIFY_DONE; 1805 1806 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1807 memcpy(sdata->name, dev->name, IFNAMSIZ); 1808 ieee80211_debugfs_rename_netdev(sdata); 1809 1810 return NOTIFY_OK; 1811 } 1812 1813 static struct notifier_block mac80211_netdev_notifier = { 1814 .notifier_call = netdev_notify, 1815 }; 1816 1817 int ieee80211_iface_init(void) 1818 { 1819 return register_netdevice_notifier(&mac80211_netdev_notifier); 1820 } 1821 1822 void ieee80211_iface_exit(void) 1823 { 1824 unregister_netdevice_notifier(&mac80211_netdev_notifier); 1825 } 1826