1 /* 2 * Interface handling (except master interface) 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 = chanctx_conf->def.chan->max_power; 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 drv_flush(local, false); 96 97 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 98 return IEEE80211_CONF_CHANGE_IDLE; 99 } 100 101 void ieee80211_recalc_idle(struct ieee80211_local *local) 102 { 103 bool working = false, scanning, active; 104 unsigned int led_trig_start = 0, led_trig_stop = 0; 105 struct ieee80211_roc_work *roc; 106 u32 change; 107 108 lockdep_assert_held(&local->mtx); 109 110 active = !list_empty(&local->chanctx_list) || local->monitors; 111 112 if (!local->ops->remain_on_channel) { 113 list_for_each_entry(roc, &local->roc_list, list) { 114 working = true; 115 break; 116 } 117 } 118 119 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) || 120 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 121 122 if (working || scanning) 123 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 124 else 125 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 126 127 if (active) 128 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 129 else 130 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 131 132 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 133 134 if (working || scanning || active) 135 change = ieee80211_idle_off(local); 136 else 137 change = ieee80211_idle_on(local); 138 if (change) 139 ieee80211_hw_config(local, change); 140 } 141 142 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) 143 { 144 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) 145 return -EINVAL; 146 147 dev->mtu = new_mtu; 148 return 0; 149 } 150 151 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr) 152 { 153 struct ieee80211_sub_if_data *sdata; 154 u64 new, mask, tmp; 155 u8 *m; 156 int ret = 0; 157 158 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 159 return 0; 160 161 m = addr; 162 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 163 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 164 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 165 166 m = local->hw.wiphy->addr_mask; 167 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 168 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 169 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 170 171 172 mutex_lock(&local->iflist_mtx); 173 list_for_each_entry(sdata, &local->interfaces, list) { 174 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 175 continue; 176 177 m = sdata->vif.addr; 178 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 179 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 180 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 181 182 if ((new & ~mask) != (tmp & ~mask)) { 183 ret = -EINVAL; 184 break; 185 } 186 } 187 mutex_unlock(&local->iflist_mtx); 188 189 return ret; 190 } 191 192 static int ieee80211_change_mac(struct net_device *dev, void *addr) 193 { 194 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 195 struct sockaddr *sa = addr; 196 int ret; 197 198 if (ieee80211_sdata_running(sdata)) 199 return -EBUSY; 200 201 ret = ieee80211_verify_mac(sdata->local, sa->sa_data); 202 if (ret) 203 return ret; 204 205 ret = eth_mac_addr(dev, sa); 206 207 if (ret == 0) 208 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 209 210 return ret; 211 } 212 213 static inline int identical_mac_addr_allowed(int type1, int type2) 214 { 215 return type1 == NL80211_IFTYPE_MONITOR || 216 type2 == NL80211_IFTYPE_MONITOR || 217 type1 == NL80211_IFTYPE_P2P_DEVICE || 218 type2 == NL80211_IFTYPE_P2P_DEVICE || 219 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || 220 (type1 == NL80211_IFTYPE_WDS && 221 (type2 == NL80211_IFTYPE_WDS || 222 type2 == NL80211_IFTYPE_AP)) || 223 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 224 (type1 == NL80211_IFTYPE_AP_VLAN && 225 (type2 == NL80211_IFTYPE_AP || 226 type2 == NL80211_IFTYPE_AP_VLAN)); 227 } 228 229 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 230 enum nl80211_iftype iftype) 231 { 232 struct ieee80211_local *local = sdata->local; 233 struct ieee80211_sub_if_data *nsdata; 234 235 ASSERT_RTNL(); 236 237 /* we hold the RTNL here so can safely walk the list */ 238 list_for_each_entry(nsdata, &local->interfaces, list) { 239 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 240 /* 241 * Allow only a single IBSS interface to be up at any 242 * time. This is restricted because beacon distribution 243 * cannot work properly if both are in the same IBSS. 244 * 245 * To remove this restriction we'd have to disallow them 246 * from setting the same SSID on different IBSS interfaces 247 * belonging to the same hardware. Then, however, we're 248 * faced with having to adopt two different TSF timers... 249 */ 250 if (iftype == NL80211_IFTYPE_ADHOC && 251 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 252 return -EBUSY; 253 254 /* 255 * The remaining checks are only performed for interfaces 256 * with the same MAC address. 257 */ 258 if (!ether_addr_equal(sdata->vif.addr, 259 nsdata->vif.addr)) 260 continue; 261 262 /* 263 * check whether it may have the same address 264 */ 265 if (!identical_mac_addr_allowed(iftype, 266 nsdata->vif.type)) 267 return -ENOTUNIQ; 268 269 /* 270 * can only add VLANs to enabled APs 271 */ 272 if (iftype == NL80211_IFTYPE_AP_VLAN && 273 nsdata->vif.type == NL80211_IFTYPE_AP) 274 sdata->bss = &nsdata->u.ap; 275 } 276 } 277 278 return 0; 279 } 280 281 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata) 282 { 283 int n_queues = sdata->local->hw.queues; 284 int i; 285 286 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) { 287 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 288 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 289 IEEE80211_INVAL_HW_QUEUE)) 290 return -EINVAL; 291 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 292 n_queues)) 293 return -EINVAL; 294 } 295 } 296 297 if ((sdata->vif.type != NL80211_IFTYPE_AP && 298 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) || 299 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) { 300 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 301 return 0; 302 } 303 304 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 305 return -EINVAL; 306 307 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 308 return -EINVAL; 309 310 return 0; 311 } 312 313 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 314 const int offset) 315 { 316 struct ieee80211_local *local = sdata->local; 317 u32 flags = sdata->u.mntr_flags; 318 319 #define ADJUST(_f, _s) do { \ 320 if (flags & MONITOR_FLAG_##_f) \ 321 local->fif_##_s += offset; \ 322 } while (0) 323 324 ADJUST(FCSFAIL, fcsfail); 325 ADJUST(PLCPFAIL, plcpfail); 326 ADJUST(CONTROL, control); 327 ADJUST(CONTROL, pspoll); 328 ADJUST(OTHER_BSS, other_bss); 329 330 #undef ADJUST 331 } 332 333 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 334 { 335 struct ieee80211_local *local = sdata->local; 336 int i; 337 338 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 339 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 340 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 341 else if (local->hw.queues >= IEEE80211_NUM_ACS) 342 sdata->vif.hw_queue[i] = i; 343 else 344 sdata->vif.hw_queue[i] = 0; 345 } 346 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 347 } 348 349 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 350 { 351 struct ieee80211_sub_if_data *sdata; 352 int ret = 0; 353 354 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 355 return 0; 356 357 mutex_lock(&local->iflist_mtx); 358 359 if (local->monitor_sdata) 360 goto out_unlock; 361 362 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 363 if (!sdata) { 364 ret = -ENOMEM; 365 goto out_unlock; 366 } 367 368 /* set up data */ 369 sdata->local = local; 370 sdata->vif.type = NL80211_IFTYPE_MONITOR; 371 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 372 wiphy_name(local->hw.wiphy)); 373 374 ieee80211_set_default_queues(sdata); 375 376 ret = drv_add_interface(local, sdata); 377 if (WARN_ON(ret)) { 378 /* ok .. stupid driver, it asked for this! */ 379 kfree(sdata); 380 goto out_unlock; 381 } 382 383 ret = ieee80211_check_queues(sdata); 384 if (ret) { 385 kfree(sdata); 386 goto out_unlock; 387 } 388 389 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef, 390 IEEE80211_CHANCTX_EXCLUSIVE); 391 if (ret) { 392 drv_remove_interface(local, sdata); 393 kfree(sdata); 394 goto out_unlock; 395 } 396 397 rcu_assign_pointer(local->monitor_sdata, sdata); 398 out_unlock: 399 mutex_unlock(&local->iflist_mtx); 400 return ret; 401 } 402 403 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 404 { 405 struct ieee80211_sub_if_data *sdata; 406 407 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 408 return; 409 410 mutex_lock(&local->iflist_mtx); 411 412 sdata = rcu_dereference_protected(local->monitor_sdata, 413 lockdep_is_held(&local->iflist_mtx)); 414 if (!sdata) 415 goto out_unlock; 416 417 rcu_assign_pointer(local->monitor_sdata, NULL); 418 synchronize_net(); 419 420 ieee80211_vif_release_channel(sdata); 421 422 drv_remove_interface(local, sdata); 423 424 kfree(sdata); 425 out_unlock: 426 mutex_unlock(&local->iflist_mtx); 427 } 428 429 /* 430 * NOTE: Be very careful when changing this function, it must NOT return 431 * an error on interface type changes that have been pre-checked, so most 432 * checks should be in ieee80211_check_concurrent_iface. 433 */ 434 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 435 { 436 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 437 struct net_device *dev = wdev->netdev; 438 struct ieee80211_local *local = sdata->local; 439 struct sta_info *sta; 440 u32 changed = 0; 441 int res; 442 u32 hw_reconf_flags = 0; 443 444 switch (sdata->vif.type) { 445 case NL80211_IFTYPE_WDS: 446 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 447 return -ENOLINK; 448 break; 449 case NL80211_IFTYPE_AP_VLAN: { 450 struct ieee80211_sub_if_data *master; 451 452 if (!sdata->bss) 453 return -ENOLINK; 454 455 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 456 457 master = container_of(sdata->bss, 458 struct ieee80211_sub_if_data, u.ap); 459 sdata->control_port_protocol = 460 master->control_port_protocol; 461 sdata->control_port_no_encrypt = 462 master->control_port_no_encrypt; 463 break; 464 } 465 case NL80211_IFTYPE_AP: 466 sdata->bss = &sdata->u.ap; 467 break; 468 case NL80211_IFTYPE_MESH_POINT: 469 case NL80211_IFTYPE_STATION: 470 case NL80211_IFTYPE_MONITOR: 471 case NL80211_IFTYPE_ADHOC: 472 case NL80211_IFTYPE_P2P_DEVICE: 473 /* no special treatment */ 474 break; 475 case NL80211_IFTYPE_UNSPECIFIED: 476 case NUM_NL80211_IFTYPES: 477 case NL80211_IFTYPE_P2P_CLIENT: 478 case NL80211_IFTYPE_P2P_GO: 479 /* cannot happen */ 480 WARN_ON(1); 481 break; 482 } 483 484 if (local->open_count == 0) { 485 res = drv_start(local); 486 if (res) 487 goto err_del_bss; 488 /* we're brought up, everything changes */ 489 hw_reconf_flags = ~0; 490 ieee80211_led_radio(local, true); 491 ieee80211_mod_tpt_led_trig(local, 492 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 493 } 494 495 /* 496 * Copy the hopefully now-present MAC address to 497 * this interface, if it has the special null one. 498 */ 499 if (dev && is_zero_ether_addr(dev->dev_addr)) { 500 memcpy(dev->dev_addr, 501 local->hw.wiphy->perm_addr, 502 ETH_ALEN); 503 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 504 505 if (!is_valid_ether_addr(dev->dev_addr)) { 506 res = -EADDRNOTAVAIL; 507 goto err_stop; 508 } 509 } 510 511 switch (sdata->vif.type) { 512 case NL80211_IFTYPE_AP_VLAN: 513 /* no need to tell driver, but set carrier and chanctx */ 514 if (rtnl_dereference(sdata->bss->beacon)) { 515 ieee80211_vif_vlan_copy_chanctx(sdata); 516 netif_carrier_on(dev); 517 } else { 518 netif_carrier_off(dev); 519 } 520 break; 521 case NL80211_IFTYPE_MONITOR: 522 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 523 local->cooked_mntrs++; 524 break; 525 } 526 527 if (local->monitors == 0 && local->open_count == 0) { 528 res = ieee80211_add_virtual_monitor(local); 529 if (res) 530 goto err_stop; 531 } 532 533 /* must be before the call to ieee80211_configure_filter */ 534 local->monitors++; 535 if (local->monitors == 1) { 536 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 537 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 538 } 539 540 ieee80211_adjust_monitor_flags(sdata, 1); 541 ieee80211_configure_filter(local); 542 mutex_lock(&local->mtx); 543 ieee80211_recalc_idle(local); 544 mutex_unlock(&local->mtx); 545 546 netif_carrier_on(dev); 547 break; 548 default: 549 if (coming_up) { 550 ieee80211_del_virtual_monitor(local); 551 552 res = drv_add_interface(local, sdata); 553 if (res) 554 goto err_stop; 555 res = ieee80211_check_queues(sdata); 556 if (res) 557 goto err_del_interface; 558 } 559 560 drv_add_interface_debugfs(local, sdata); 561 562 if (sdata->vif.type == NL80211_IFTYPE_AP) { 563 local->fif_pspoll++; 564 local->fif_probe_req++; 565 566 ieee80211_configure_filter(local); 567 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 568 local->fif_probe_req++; 569 } 570 571 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 572 changed |= ieee80211_reset_erp_info(sdata); 573 ieee80211_bss_info_change_notify(sdata, changed); 574 575 switch (sdata->vif.type) { 576 case NL80211_IFTYPE_STATION: 577 case NL80211_IFTYPE_ADHOC: 578 case NL80211_IFTYPE_AP: 579 case NL80211_IFTYPE_MESH_POINT: 580 netif_carrier_off(dev); 581 break; 582 case NL80211_IFTYPE_WDS: 583 case NL80211_IFTYPE_P2P_DEVICE: 584 break; 585 default: 586 netif_carrier_on(dev); 587 } 588 589 /* 590 * set default queue parameters so drivers don't 591 * need to initialise the hardware if the hardware 592 * doesn't start up with sane defaults 593 */ 594 ieee80211_set_wmm_default(sdata, true); 595 } 596 597 set_bit(SDATA_STATE_RUNNING, &sdata->state); 598 599 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 600 /* Create STA entry for the WDS peer */ 601 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 602 GFP_KERNEL); 603 if (!sta) { 604 res = -ENOMEM; 605 goto err_del_interface; 606 } 607 608 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 609 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 610 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 611 612 res = sta_info_insert(sta); 613 if (res) { 614 /* STA has been freed */ 615 goto err_del_interface; 616 } 617 618 rate_control_rate_init(sta); 619 netif_carrier_on(dev); 620 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 621 rcu_assign_pointer(local->p2p_sdata, sdata); 622 } 623 624 /* 625 * set_multicast_list will be invoked by the networking core 626 * which will check whether any increments here were done in 627 * error and sync them down to the hardware as filter flags. 628 */ 629 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 630 atomic_inc(&local->iff_allmultis); 631 632 if (sdata->flags & IEEE80211_SDATA_PROMISC) 633 atomic_inc(&local->iff_promiscs); 634 635 if (coming_up) 636 local->open_count++; 637 638 if (hw_reconf_flags) 639 ieee80211_hw_config(local, hw_reconf_flags); 640 641 ieee80211_recalc_ps(local, -1); 642 643 if (dev) 644 netif_tx_start_all_queues(dev); 645 646 return 0; 647 err_del_interface: 648 drv_remove_interface(local, sdata); 649 err_stop: 650 if (!local->open_count) 651 drv_stop(local); 652 err_del_bss: 653 sdata->bss = NULL; 654 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 655 list_del(&sdata->u.vlan.list); 656 /* might already be clear but that doesn't matter */ 657 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 658 return res; 659 } 660 661 static int ieee80211_open(struct net_device *dev) 662 { 663 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 664 int err; 665 666 /* fail early if user set an invalid address */ 667 if (!is_valid_ether_addr(dev->dev_addr)) 668 return -EADDRNOTAVAIL; 669 670 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 671 if (err) 672 return err; 673 674 return ieee80211_do_open(&sdata->wdev, true); 675 } 676 677 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 678 bool going_down) 679 { 680 struct ieee80211_local *local = sdata->local; 681 unsigned long flags; 682 struct sk_buff *skb, *tmp; 683 u32 hw_reconf_flags = 0; 684 int i, flushed; 685 struct ps_data *ps; 686 687 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 688 689 if (rcu_access_pointer(local->scan_sdata) == sdata) 690 ieee80211_scan_cancel(local); 691 692 /* 693 * Stop TX on this interface first. 694 */ 695 if (sdata->dev) 696 netif_tx_stop_all_queues(sdata->dev); 697 698 ieee80211_roc_purge(sdata); 699 700 if (sdata->vif.type == NL80211_IFTYPE_STATION) 701 ieee80211_mgd_stop(sdata); 702 703 /* 704 * Remove all stations associated with this interface. 705 * 706 * This must be done before calling ops->remove_interface() 707 * because otherwise we can later invoke ops->sta_notify() 708 * whenever the STAs are removed, and that invalidates driver 709 * assumptions about always getting a vif pointer that is valid 710 * (because if we remove a STA after ops->remove_interface() 711 * the driver will have removed the vif info already!) 712 * 713 * This is relevant only in WDS mode, in all other modes we've 714 * already removed all stations when disconnecting or similar, 715 * so warn otherwise. 716 * 717 * We call sta_info_flush_cleanup() later, to combine RCU waits. 718 */ 719 flushed = sta_info_flush_defer(sdata); 720 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) || 721 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)); 722 723 /* 724 * Don't count this interface for promisc/allmulti while it 725 * is down. dev_mc_unsync() will invoke set_multicast_list 726 * on the master interface which will sync these down to the 727 * hardware as filter flags. 728 */ 729 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 730 atomic_dec(&local->iff_allmultis); 731 732 if (sdata->flags & IEEE80211_SDATA_PROMISC) 733 atomic_dec(&local->iff_promiscs); 734 735 if (sdata->vif.type == NL80211_IFTYPE_AP) { 736 local->fif_pspoll--; 737 local->fif_probe_req--; 738 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 739 local->fif_probe_req--; 740 } 741 742 if (sdata->dev) { 743 netif_addr_lock_bh(sdata->dev); 744 spin_lock_bh(&local->filter_lock); 745 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 746 sdata->dev->addr_len); 747 spin_unlock_bh(&local->filter_lock); 748 netif_addr_unlock_bh(sdata->dev); 749 750 ieee80211_configure_filter(local); 751 } 752 753 del_timer_sync(&local->dynamic_ps_timer); 754 cancel_work_sync(&local->dynamic_ps_enable_work); 755 756 cancel_work_sync(&sdata->recalc_smps); 757 758 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); 759 760 if (sdata->wdev.cac_started) { 761 mutex_lock(&local->iflist_mtx); 762 ieee80211_vif_release_channel(sdata); 763 mutex_unlock(&local->iflist_mtx); 764 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED, 765 GFP_KERNEL); 766 } 767 768 /* APs need special treatment */ 769 if (sdata->vif.type == NL80211_IFTYPE_AP) { 770 struct ieee80211_sub_if_data *vlan, *tmpsdata; 771 772 /* down all dependent devices, that is VLANs */ 773 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 774 u.vlan.list) 775 dev_close(vlan->dev); 776 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 777 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 778 /* remove all packets in parent bc_buf pointing to this dev */ 779 ps = &sdata->bss->ps; 780 781 spin_lock_irqsave(&ps->bc_buf.lock, flags); 782 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 783 if (skb->dev == sdata->dev) { 784 __skb_unlink(skb, &ps->bc_buf); 785 local->total_ps_buffered--; 786 ieee80211_free_txskb(&local->hw, skb); 787 } 788 } 789 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 790 } 791 792 if (going_down) 793 local->open_count--; 794 795 switch (sdata->vif.type) { 796 case NL80211_IFTYPE_AP_VLAN: 797 list_del(&sdata->u.vlan.list); 798 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL); 799 /* no need to tell driver */ 800 break; 801 case NL80211_IFTYPE_MONITOR: 802 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 803 local->cooked_mntrs--; 804 break; 805 } 806 807 local->monitors--; 808 if (local->monitors == 0) { 809 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 810 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 811 ieee80211_del_virtual_monitor(local); 812 } 813 814 ieee80211_adjust_monitor_flags(sdata, -1); 815 ieee80211_configure_filter(local); 816 mutex_lock(&local->mtx); 817 ieee80211_recalc_idle(local); 818 mutex_unlock(&local->mtx); 819 break; 820 case NL80211_IFTYPE_P2P_DEVICE: 821 /* relies on synchronize_rcu() below */ 822 rcu_assign_pointer(local->p2p_sdata, NULL); 823 /* fall through */ 824 default: 825 cancel_work_sync(&sdata->work); 826 /* 827 * When we get here, the interface is marked down. 828 * 829 * sta_info_flush_cleanup() requires rcu_barrier() 830 * first to wait for the station call_rcu() calls 831 * to complete, here we need at least sychronize_rcu() 832 * it to wait for the RX path in case it is using the 833 * interface and enqueuing frames at this very time on 834 * another CPU. 835 */ 836 rcu_barrier(); 837 sta_info_flush_cleanup(sdata); 838 839 /* 840 * Free all remaining keys, there shouldn't be any, 841 * except maybe in WDS mode? 842 */ 843 ieee80211_free_keys(sdata); 844 845 /* fall through */ 846 case NL80211_IFTYPE_AP: 847 skb_queue_purge(&sdata->skb_queue); 848 849 drv_remove_interface_debugfs(local, sdata); 850 851 if (going_down) 852 drv_remove_interface(local, sdata); 853 } 854 855 sdata->bss = NULL; 856 857 ieee80211_recalc_ps(local, -1); 858 859 if (local->open_count == 0) { 860 ieee80211_clear_tx_pending(local); 861 ieee80211_stop_device(local); 862 863 /* no reconfiguring after stop! */ 864 hw_reconf_flags = 0; 865 } 866 867 /* do after stop to avoid reconfiguring when we stop anyway */ 868 if (hw_reconf_flags) 869 ieee80211_hw_config(local, hw_reconf_flags); 870 871 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 872 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 873 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 874 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 875 if (info->control.vif == &sdata->vif) { 876 __skb_unlink(skb, &local->pending[i]); 877 ieee80211_free_txskb(&local->hw, skb); 878 } 879 } 880 } 881 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 882 883 if (local->monitors == local->open_count && local->monitors > 0) 884 ieee80211_add_virtual_monitor(local); 885 } 886 887 static int ieee80211_stop(struct net_device *dev) 888 { 889 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 890 891 ieee80211_do_stop(sdata, true); 892 893 return 0; 894 } 895 896 static void ieee80211_set_multicast_list(struct net_device *dev) 897 { 898 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 899 struct ieee80211_local *local = sdata->local; 900 int allmulti, promisc, sdata_allmulti, sdata_promisc; 901 902 allmulti = !!(dev->flags & IFF_ALLMULTI); 903 promisc = !!(dev->flags & IFF_PROMISC); 904 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 905 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); 906 907 if (allmulti != sdata_allmulti) { 908 if (dev->flags & IFF_ALLMULTI) 909 atomic_inc(&local->iff_allmultis); 910 else 911 atomic_dec(&local->iff_allmultis); 912 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 913 } 914 915 if (promisc != sdata_promisc) { 916 if (dev->flags & IFF_PROMISC) 917 atomic_inc(&local->iff_promiscs); 918 else 919 atomic_dec(&local->iff_promiscs); 920 sdata->flags ^= IEEE80211_SDATA_PROMISC; 921 } 922 spin_lock_bh(&local->filter_lock); 923 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 924 spin_unlock_bh(&local->filter_lock); 925 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 926 } 927 928 /* 929 * Called when the netdev is removed or, by the code below, before 930 * the interface type changes. 931 */ 932 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 933 { 934 int flushed; 935 int i; 936 937 /* free extra data */ 938 ieee80211_free_keys(sdata); 939 940 ieee80211_debugfs_remove_netdev(sdata); 941 942 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 943 __skb_queue_purge(&sdata->fragments[i].skb_list); 944 sdata->fragment_next = 0; 945 946 if (ieee80211_vif_is_mesh(&sdata->vif)) 947 mesh_rmc_free(sdata); 948 949 flushed = sta_info_flush(sdata); 950 WARN_ON(flushed); 951 } 952 953 static void ieee80211_uninit(struct net_device *dev) 954 { 955 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 956 } 957 958 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 959 struct sk_buff *skb) 960 { 961 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 962 } 963 964 static const struct net_device_ops ieee80211_dataif_ops = { 965 .ndo_open = ieee80211_open, 966 .ndo_stop = ieee80211_stop, 967 .ndo_uninit = ieee80211_uninit, 968 .ndo_start_xmit = ieee80211_subif_start_xmit, 969 .ndo_set_rx_mode = ieee80211_set_multicast_list, 970 .ndo_change_mtu = ieee80211_change_mtu, 971 .ndo_set_mac_address = ieee80211_change_mac, 972 .ndo_select_queue = ieee80211_netdev_select_queue, 973 }; 974 975 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 976 struct sk_buff *skb) 977 { 978 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 979 struct ieee80211_local *local = sdata->local; 980 struct ieee80211_hdr *hdr; 981 struct ieee80211_radiotap_header *rtap = (void *)skb->data; 982 983 if (local->hw.queues < IEEE80211_NUM_ACS) 984 return 0; 985 986 if (skb->len < 4 || 987 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) 988 return 0; /* doesn't matter, frame will be dropped */ 989 990 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); 991 992 return ieee80211_select_queue_80211(sdata, skb, hdr); 993 } 994 995 static const struct net_device_ops ieee80211_monitorif_ops = { 996 .ndo_open = ieee80211_open, 997 .ndo_stop = ieee80211_stop, 998 .ndo_uninit = ieee80211_uninit, 999 .ndo_start_xmit = ieee80211_monitor_start_xmit, 1000 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1001 .ndo_change_mtu = ieee80211_change_mtu, 1002 .ndo_set_mac_address = eth_mac_addr, 1003 .ndo_select_queue = ieee80211_monitor_select_queue, 1004 }; 1005 1006 static void ieee80211_if_setup(struct net_device *dev) 1007 { 1008 ether_setup(dev); 1009 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1010 dev->netdev_ops = &ieee80211_dataif_ops; 1011 dev->destructor = free_netdev; 1012 } 1013 1014 static void ieee80211_iface_work(struct work_struct *work) 1015 { 1016 struct ieee80211_sub_if_data *sdata = 1017 container_of(work, struct ieee80211_sub_if_data, work); 1018 struct ieee80211_local *local = sdata->local; 1019 struct sk_buff *skb; 1020 struct sta_info *sta; 1021 struct ieee80211_ra_tid *ra_tid; 1022 1023 if (!ieee80211_sdata_running(sdata)) 1024 return; 1025 1026 if (local->scanning) 1027 return; 1028 1029 /* 1030 * ieee80211_queue_work() should have picked up most cases, 1031 * here we'll pick the rest. 1032 */ 1033 if (WARN(local->suspended, 1034 "interface work scheduled while going to suspend\n")) 1035 return; 1036 1037 /* first process frames */ 1038 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1039 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1040 1041 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { 1042 ra_tid = (void *)&skb->cb; 1043 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, 1044 ra_tid->tid); 1045 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { 1046 ra_tid = (void *)&skb->cb; 1047 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, 1048 ra_tid->tid); 1049 } else if (ieee80211_is_action(mgmt->frame_control) && 1050 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1051 int len = skb->len; 1052 1053 mutex_lock(&local->sta_mtx); 1054 sta = sta_info_get_bss(sdata, mgmt->sa); 1055 if (sta) { 1056 switch (mgmt->u.action.u.addba_req.action_code) { 1057 case WLAN_ACTION_ADDBA_REQ: 1058 ieee80211_process_addba_request( 1059 local, sta, mgmt, len); 1060 break; 1061 case WLAN_ACTION_ADDBA_RESP: 1062 ieee80211_process_addba_resp(local, sta, 1063 mgmt, len); 1064 break; 1065 case WLAN_ACTION_DELBA: 1066 ieee80211_process_delba(sdata, sta, 1067 mgmt, len); 1068 break; 1069 default: 1070 WARN_ON(1); 1071 break; 1072 } 1073 } 1074 mutex_unlock(&local->sta_mtx); 1075 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1076 struct ieee80211_hdr *hdr = (void *)mgmt; 1077 /* 1078 * So the frame isn't mgmt, but frame_control 1079 * is at the right place anyway, of course, so 1080 * the if statement is correct. 1081 * 1082 * Warn if we have other data frame types here, 1083 * they must not get here. 1084 */ 1085 WARN_ON(hdr->frame_control & 1086 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1087 WARN_ON(!(hdr->seq_ctrl & 1088 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1089 /* 1090 * This was a fragment of a frame, received while 1091 * a block-ack session was active. That cannot be 1092 * right, so terminate the session. 1093 */ 1094 mutex_lock(&local->sta_mtx); 1095 sta = sta_info_get_bss(sdata, mgmt->sa); 1096 if (sta) { 1097 u16 tid = *ieee80211_get_qos_ctl(hdr) & 1098 IEEE80211_QOS_CTL_TID_MASK; 1099 1100 __ieee80211_stop_rx_ba_session( 1101 sta, tid, WLAN_BACK_RECIPIENT, 1102 WLAN_REASON_QSTA_REQUIRE_SETUP, 1103 true); 1104 } 1105 mutex_unlock(&local->sta_mtx); 1106 } else switch (sdata->vif.type) { 1107 case NL80211_IFTYPE_STATION: 1108 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1109 break; 1110 case NL80211_IFTYPE_ADHOC: 1111 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1112 break; 1113 case NL80211_IFTYPE_MESH_POINT: 1114 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1115 break; 1116 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1117 break; 1118 default: 1119 WARN(1, "frame for unexpected interface type"); 1120 break; 1121 } 1122 1123 kfree_skb(skb); 1124 } 1125 1126 /* then other type-dependent work */ 1127 switch (sdata->vif.type) { 1128 case NL80211_IFTYPE_STATION: 1129 ieee80211_sta_work(sdata); 1130 break; 1131 case NL80211_IFTYPE_ADHOC: 1132 ieee80211_ibss_work(sdata); 1133 break; 1134 case NL80211_IFTYPE_MESH_POINT: 1135 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1136 break; 1137 ieee80211_mesh_work(sdata); 1138 break; 1139 default: 1140 break; 1141 } 1142 } 1143 1144 static void ieee80211_recalc_smps_work(struct work_struct *work) 1145 { 1146 struct ieee80211_sub_if_data *sdata = 1147 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1148 1149 ieee80211_recalc_smps(sdata); 1150 } 1151 1152 /* 1153 * Helper function to initialise an interface to a specific type. 1154 */ 1155 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1156 enum nl80211_iftype type) 1157 { 1158 /* clear type-dependent union */ 1159 memset(&sdata->u, 0, sizeof(sdata->u)); 1160 1161 /* and set some type-dependent values */ 1162 sdata->vif.type = type; 1163 sdata->vif.p2p = false; 1164 sdata->wdev.iftype = type; 1165 1166 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1167 sdata->control_port_no_encrypt = false; 1168 1169 sdata->noack_map = 0; 1170 1171 /* only monitor/p2p-device differ */ 1172 if (sdata->dev) { 1173 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1174 sdata->dev->type = ARPHRD_ETHER; 1175 } 1176 1177 skb_queue_head_init(&sdata->skb_queue); 1178 INIT_WORK(&sdata->work, ieee80211_iface_work); 1179 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1180 1181 switch (type) { 1182 case NL80211_IFTYPE_P2P_GO: 1183 type = NL80211_IFTYPE_AP; 1184 sdata->vif.type = type; 1185 sdata->vif.p2p = true; 1186 /* fall through */ 1187 case NL80211_IFTYPE_AP: 1188 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1189 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1190 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1191 break; 1192 case NL80211_IFTYPE_P2P_CLIENT: 1193 type = NL80211_IFTYPE_STATION; 1194 sdata->vif.type = type; 1195 sdata->vif.p2p = true; 1196 /* fall through */ 1197 case NL80211_IFTYPE_STATION: 1198 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1199 ieee80211_sta_setup_sdata(sdata); 1200 break; 1201 case NL80211_IFTYPE_ADHOC: 1202 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1203 ieee80211_ibss_setup_sdata(sdata); 1204 break; 1205 case NL80211_IFTYPE_MESH_POINT: 1206 if (ieee80211_vif_is_mesh(&sdata->vif)) 1207 ieee80211_mesh_init_sdata(sdata); 1208 break; 1209 case NL80211_IFTYPE_MONITOR: 1210 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1211 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1212 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 1213 MONITOR_FLAG_OTHER_BSS; 1214 break; 1215 case NL80211_IFTYPE_WDS: 1216 sdata->vif.bss_conf.bssid = NULL; 1217 break; 1218 case NL80211_IFTYPE_AP_VLAN: 1219 break; 1220 case NL80211_IFTYPE_P2P_DEVICE: 1221 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1222 break; 1223 case NL80211_IFTYPE_UNSPECIFIED: 1224 case NUM_NL80211_IFTYPES: 1225 BUG(); 1226 break; 1227 } 1228 1229 ieee80211_debugfs_add_netdev(sdata); 1230 } 1231 1232 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1233 enum nl80211_iftype type) 1234 { 1235 struct ieee80211_local *local = sdata->local; 1236 int ret, err; 1237 enum nl80211_iftype internal_type = type; 1238 bool p2p = false; 1239 1240 ASSERT_RTNL(); 1241 1242 if (!local->ops->change_interface) 1243 return -EBUSY; 1244 1245 switch (sdata->vif.type) { 1246 case NL80211_IFTYPE_AP: 1247 case NL80211_IFTYPE_STATION: 1248 case NL80211_IFTYPE_ADHOC: 1249 /* 1250 * Could maybe also all others here? 1251 * Just not sure how that interacts 1252 * with the RX/config path e.g. for 1253 * mesh. 1254 */ 1255 break; 1256 default: 1257 return -EBUSY; 1258 } 1259 1260 switch (type) { 1261 case NL80211_IFTYPE_AP: 1262 case NL80211_IFTYPE_STATION: 1263 case NL80211_IFTYPE_ADHOC: 1264 /* 1265 * Could probably support everything 1266 * but WDS here (WDS do_open can fail 1267 * under memory pressure, which this 1268 * code isn't prepared to handle). 1269 */ 1270 break; 1271 case NL80211_IFTYPE_P2P_CLIENT: 1272 p2p = true; 1273 internal_type = NL80211_IFTYPE_STATION; 1274 break; 1275 case NL80211_IFTYPE_P2P_GO: 1276 p2p = true; 1277 internal_type = NL80211_IFTYPE_AP; 1278 break; 1279 default: 1280 return -EBUSY; 1281 } 1282 1283 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1284 if (ret) 1285 return ret; 1286 1287 ieee80211_do_stop(sdata, false); 1288 1289 ieee80211_teardown_sdata(sdata); 1290 1291 ret = drv_change_interface(local, sdata, internal_type, p2p); 1292 if (ret) 1293 type = sdata->vif.type; 1294 1295 /* 1296 * Ignore return value here, there's not much we can do since 1297 * the driver changed the interface type internally already. 1298 * The warnings will hopefully make driver authors fix it :-) 1299 */ 1300 ieee80211_check_queues(sdata); 1301 1302 ieee80211_setup_sdata(sdata, type); 1303 1304 err = ieee80211_do_open(&sdata->wdev, false); 1305 WARN(err, "type change: do_open returned %d", err); 1306 1307 return ret; 1308 } 1309 1310 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1311 enum nl80211_iftype type) 1312 { 1313 int ret; 1314 1315 ASSERT_RTNL(); 1316 1317 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1318 return 0; 1319 1320 if (ieee80211_sdata_running(sdata)) { 1321 ret = ieee80211_runtime_change_iftype(sdata, type); 1322 if (ret) 1323 return ret; 1324 } else { 1325 /* Purge and reset type-dependent state. */ 1326 ieee80211_teardown_sdata(sdata); 1327 ieee80211_setup_sdata(sdata, type); 1328 } 1329 1330 /* reset some values that shouldn't be kept across type changes */ 1331 sdata->drop_unencrypted = 0; 1332 if (type == NL80211_IFTYPE_STATION) 1333 sdata->u.mgd.use_4addr = false; 1334 1335 return 0; 1336 } 1337 1338 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1339 u8 *perm_addr, enum nl80211_iftype type) 1340 { 1341 struct ieee80211_sub_if_data *sdata; 1342 u64 mask, start, addr, val, inc; 1343 u8 *m; 1344 u8 tmp_addr[ETH_ALEN]; 1345 int i; 1346 1347 /* default ... something at least */ 1348 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1349 1350 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1351 local->hw.wiphy->n_addresses <= 1) 1352 return; 1353 1354 mutex_lock(&local->iflist_mtx); 1355 1356 switch (type) { 1357 case NL80211_IFTYPE_MONITOR: 1358 /* doesn't matter */ 1359 break; 1360 case NL80211_IFTYPE_WDS: 1361 case NL80211_IFTYPE_AP_VLAN: 1362 /* match up with an AP interface */ 1363 list_for_each_entry(sdata, &local->interfaces, list) { 1364 if (sdata->vif.type != NL80211_IFTYPE_AP) 1365 continue; 1366 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1367 break; 1368 } 1369 /* keep default if no AP interface present */ 1370 break; 1371 case NL80211_IFTYPE_P2P_CLIENT: 1372 case NL80211_IFTYPE_P2P_GO: 1373 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) { 1374 list_for_each_entry(sdata, &local->interfaces, list) { 1375 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1376 continue; 1377 if (!ieee80211_sdata_running(sdata)) 1378 continue; 1379 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1380 goto out_unlock; 1381 } 1382 } 1383 /* otherwise fall through */ 1384 default: 1385 /* assign a new address if possible -- try n_addresses first */ 1386 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1387 bool used = false; 1388 1389 list_for_each_entry(sdata, &local->interfaces, list) { 1390 if (memcmp(local->hw.wiphy->addresses[i].addr, 1391 sdata->vif.addr, ETH_ALEN) == 0) { 1392 used = true; 1393 break; 1394 } 1395 } 1396 1397 if (!used) { 1398 memcpy(perm_addr, 1399 local->hw.wiphy->addresses[i].addr, 1400 ETH_ALEN); 1401 break; 1402 } 1403 } 1404 1405 /* try mask if available */ 1406 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1407 break; 1408 1409 m = local->hw.wiphy->addr_mask; 1410 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1411 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1412 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1413 1414 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1415 /* not a contiguous mask ... not handled now! */ 1416 pr_info("not contiguous\n"); 1417 break; 1418 } 1419 1420 m = local->hw.wiphy->perm_addr; 1421 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1422 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1423 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1424 1425 inc = 1ULL<<__ffs64(mask); 1426 val = (start & mask); 1427 addr = (start & ~mask) | (val & mask); 1428 do { 1429 bool used = false; 1430 1431 tmp_addr[5] = addr >> 0*8; 1432 tmp_addr[4] = addr >> 1*8; 1433 tmp_addr[3] = addr >> 2*8; 1434 tmp_addr[2] = addr >> 3*8; 1435 tmp_addr[1] = addr >> 4*8; 1436 tmp_addr[0] = addr >> 5*8; 1437 1438 val += inc; 1439 1440 list_for_each_entry(sdata, &local->interfaces, list) { 1441 if (memcmp(tmp_addr, sdata->vif.addr, 1442 ETH_ALEN) == 0) { 1443 used = true; 1444 break; 1445 } 1446 } 1447 1448 if (!used) { 1449 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1450 break; 1451 } 1452 addr = (start & ~mask) | (val & mask); 1453 } while (addr != start); 1454 1455 break; 1456 } 1457 1458 out_unlock: 1459 mutex_unlock(&local->iflist_mtx); 1460 } 1461 1462 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk) 1463 { 1464 struct ieee80211_sub_if_data *sdata; 1465 1466 sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk); 1467 1468 ieee80211_cleanup_sdata_stas(sdata); 1469 } 1470 1471 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1472 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1473 struct vif_params *params) 1474 { 1475 struct net_device *ndev = NULL; 1476 struct ieee80211_sub_if_data *sdata = NULL; 1477 int ret, i; 1478 int txqs = 1; 1479 1480 ASSERT_RTNL(); 1481 1482 if (type == NL80211_IFTYPE_P2P_DEVICE) { 1483 struct wireless_dev *wdev; 1484 1485 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1486 GFP_KERNEL); 1487 if (!sdata) 1488 return -ENOMEM; 1489 wdev = &sdata->wdev; 1490 1491 sdata->dev = NULL; 1492 strlcpy(sdata->name, name, IFNAMSIZ); 1493 ieee80211_assign_perm_addr(local, wdev->address, type); 1494 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1495 } else { 1496 if (local->hw.queues >= IEEE80211_NUM_ACS) 1497 txqs = IEEE80211_NUM_ACS; 1498 1499 ndev = alloc_netdev_mqs(sizeof(*sdata) + 1500 local->hw.vif_data_size, 1501 name, ieee80211_if_setup, txqs, 1); 1502 if (!ndev) 1503 return -ENOMEM; 1504 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1505 1506 ndev->needed_headroom = local->tx_headroom + 1507 4*6 /* four MAC addresses */ 1508 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1509 + 6 /* mesh */ 1510 + 8 /* rfc1042/bridge tunnel */ 1511 - ETH_HLEN /* ethernet hard_header_len */ 1512 + IEEE80211_ENCRYPT_HEADROOM; 1513 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1514 1515 ret = dev_alloc_name(ndev, ndev->name); 1516 if (ret < 0) { 1517 free_netdev(ndev); 1518 return ret; 1519 } 1520 1521 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1522 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1523 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1524 1525 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1526 sdata = netdev_priv(ndev); 1527 ndev->ieee80211_ptr = &sdata->wdev; 1528 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1529 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1530 1531 sdata->dev = ndev; 1532 } 1533 1534 /* initialise type-independent data */ 1535 sdata->wdev.wiphy = local->hw.wiphy; 1536 sdata->local = local; 1537 1538 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1539 skb_queue_head_init(&sdata->fragments[i].skb_list); 1540 1541 INIT_LIST_HEAD(&sdata->key_list); 1542 1543 spin_lock_init(&sdata->cleanup_stations_lock); 1544 INIT_LIST_HEAD(&sdata->cleanup_stations); 1545 INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk); 1546 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 1547 ieee80211_dfs_cac_timer_work); 1548 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk, 1549 ieee80211_delayed_tailroom_dec); 1550 1551 for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 1552 struct ieee80211_supported_band *sband; 1553 sband = local->hw.wiphy->bands[i]; 1554 sdata->rc_rateidx_mask[i] = 1555 sband ? (1 << sband->n_bitrates) - 1 : 0; 1556 if (sband) 1557 memcpy(sdata->rc_rateidx_mcs_mask[i], 1558 sband->ht_cap.mcs.rx_mask, 1559 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1560 else 1561 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1562 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1563 } 1564 1565 ieee80211_set_default_queues(sdata); 1566 1567 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1568 sdata->user_power_level = local->user_power_level; 1569 1570 /* setup type-dependent data */ 1571 ieee80211_setup_sdata(sdata, type); 1572 1573 if (ndev) { 1574 if (params) { 1575 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1576 if (type == NL80211_IFTYPE_STATION) 1577 sdata->u.mgd.use_4addr = params->use_4addr; 1578 } 1579 1580 ndev->features |= local->hw.netdev_features; 1581 1582 ret = register_netdevice(ndev); 1583 if (ret) { 1584 free_netdev(ndev); 1585 return ret; 1586 } 1587 } 1588 1589 mutex_lock(&local->iflist_mtx); 1590 list_add_tail_rcu(&sdata->list, &local->interfaces); 1591 mutex_unlock(&local->iflist_mtx); 1592 1593 if (new_wdev) 1594 *new_wdev = &sdata->wdev; 1595 1596 return 0; 1597 } 1598 1599 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1600 { 1601 ASSERT_RTNL(); 1602 1603 mutex_lock(&sdata->local->iflist_mtx); 1604 list_del_rcu(&sdata->list); 1605 mutex_unlock(&sdata->local->iflist_mtx); 1606 1607 synchronize_rcu(); 1608 1609 if (sdata->dev) { 1610 unregister_netdevice(sdata->dev); 1611 } else { 1612 cfg80211_unregister_wdev(&sdata->wdev); 1613 kfree(sdata); 1614 } 1615 } 1616 1617 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 1618 { 1619 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 1620 return; 1621 ieee80211_do_stop(sdata, true); 1622 ieee80211_teardown_sdata(sdata); 1623 } 1624 1625 /* 1626 * Remove all interfaces, may only be called at hardware unregistration 1627 * time because it doesn't do RCU-safe list removals. 1628 */ 1629 void ieee80211_remove_interfaces(struct ieee80211_local *local) 1630 { 1631 struct ieee80211_sub_if_data *sdata, *tmp; 1632 LIST_HEAD(unreg_list); 1633 LIST_HEAD(wdev_list); 1634 1635 ASSERT_RTNL(); 1636 1637 mutex_lock(&local->iflist_mtx); 1638 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1639 list_del(&sdata->list); 1640 1641 if (sdata->dev) 1642 unregister_netdevice_queue(sdata->dev, &unreg_list); 1643 else 1644 list_add(&sdata->list, &wdev_list); 1645 } 1646 mutex_unlock(&local->iflist_mtx); 1647 unregister_netdevice_many(&unreg_list); 1648 list_del(&unreg_list); 1649 1650 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 1651 list_del(&sdata->list); 1652 cfg80211_unregister_wdev(&sdata->wdev); 1653 kfree(sdata); 1654 } 1655 } 1656 1657 static int netdev_notify(struct notifier_block *nb, 1658 unsigned long state, 1659 void *ndev) 1660 { 1661 struct net_device *dev = ndev; 1662 struct ieee80211_sub_if_data *sdata; 1663 1664 if (state != NETDEV_CHANGENAME) 1665 return 0; 1666 1667 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1668 return 0; 1669 1670 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1671 return 0; 1672 1673 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1674 1675 memcpy(sdata->name, dev->name, IFNAMSIZ); 1676 1677 ieee80211_debugfs_rename_netdev(sdata); 1678 return 0; 1679 } 1680 1681 static struct notifier_block mac80211_netdev_notifier = { 1682 .notifier_call = netdev_notify, 1683 }; 1684 1685 int ieee80211_iface_init(void) 1686 { 1687 return register_netdevice_notifier(&mac80211_netdev_notifier); 1688 } 1689 1690 void ieee80211_iface_exit(void) 1691 { 1692 unregister_netdevice_notifier(&mac80211_netdev_notifier); 1693 } 1694