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 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; 353 354 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 355 return 0; 356 357 ASSERT_RTNL(); 358 359 if (local->monitor_sdata) 360 return 0; 361 362 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 363 if (!sdata) 364 return -ENOMEM; 365 366 /* set up data */ 367 sdata->local = local; 368 sdata->vif.type = NL80211_IFTYPE_MONITOR; 369 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 370 wiphy_name(local->hw.wiphy)); 371 372 ieee80211_set_default_queues(sdata); 373 374 ret = drv_add_interface(local, sdata); 375 if (WARN_ON(ret)) { 376 /* ok .. stupid driver, it asked for this! */ 377 kfree(sdata); 378 return ret; 379 } 380 381 ret = ieee80211_check_queues(sdata); 382 if (ret) { 383 kfree(sdata); 384 return ret; 385 } 386 387 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef, 388 IEEE80211_CHANCTX_EXCLUSIVE); 389 if (ret) { 390 drv_remove_interface(local, sdata); 391 kfree(sdata); 392 return ret; 393 } 394 395 mutex_lock(&local->iflist_mtx); 396 rcu_assign_pointer(local->monitor_sdata, sdata); 397 mutex_unlock(&local->iflist_mtx); 398 399 return 0; 400 } 401 402 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 403 { 404 struct ieee80211_sub_if_data *sdata; 405 406 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 407 return; 408 409 ASSERT_RTNL(); 410 411 mutex_lock(&local->iflist_mtx); 412 413 sdata = rcu_dereference_protected(local->monitor_sdata, 414 lockdep_is_held(&local->iflist_mtx)); 415 if (!sdata) { 416 mutex_unlock(&local->iflist_mtx); 417 return; 418 } 419 420 rcu_assign_pointer(local->monitor_sdata, NULL); 421 mutex_unlock(&local->iflist_mtx); 422 423 synchronize_net(); 424 425 ieee80211_vif_release_channel(sdata); 426 427 drv_remove_interface(local, sdata); 428 429 kfree(sdata); 430 } 431 432 /* 433 * NOTE: Be very careful when changing this function, it must NOT return 434 * an error on interface type changes that have been pre-checked, so most 435 * checks should be in ieee80211_check_concurrent_iface. 436 */ 437 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 438 { 439 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 440 struct net_device *dev = wdev->netdev; 441 struct ieee80211_local *local = sdata->local; 442 struct sta_info *sta; 443 u32 changed = 0; 444 int res; 445 u32 hw_reconf_flags = 0; 446 447 switch (sdata->vif.type) { 448 case NL80211_IFTYPE_WDS: 449 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 450 return -ENOLINK; 451 break; 452 case NL80211_IFTYPE_AP_VLAN: { 453 struct ieee80211_sub_if_data *master; 454 455 if (!sdata->bss) 456 return -ENOLINK; 457 458 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 459 460 master = container_of(sdata->bss, 461 struct ieee80211_sub_if_data, u.ap); 462 sdata->control_port_protocol = 463 master->control_port_protocol; 464 sdata->control_port_no_encrypt = 465 master->control_port_no_encrypt; 466 break; 467 } 468 case NL80211_IFTYPE_AP: 469 sdata->bss = &sdata->u.ap; 470 break; 471 case NL80211_IFTYPE_MESH_POINT: 472 case NL80211_IFTYPE_STATION: 473 case NL80211_IFTYPE_MONITOR: 474 case NL80211_IFTYPE_ADHOC: 475 case NL80211_IFTYPE_P2P_DEVICE: 476 /* no special treatment */ 477 break; 478 case NL80211_IFTYPE_UNSPECIFIED: 479 case NUM_NL80211_IFTYPES: 480 case NL80211_IFTYPE_P2P_CLIENT: 481 case NL80211_IFTYPE_P2P_GO: 482 /* cannot happen */ 483 WARN_ON(1); 484 break; 485 } 486 487 if (local->open_count == 0) { 488 res = drv_start(local); 489 if (res) 490 goto err_del_bss; 491 if (local->ops->napi_poll) 492 napi_enable(&local->napi); 493 /* we're brought up, everything changes */ 494 hw_reconf_flags = ~0; 495 ieee80211_led_radio(local, true); 496 ieee80211_mod_tpt_led_trig(local, 497 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 498 } 499 500 /* 501 * Copy the hopefully now-present MAC address to 502 * this interface, if it has the special null one. 503 */ 504 if (dev && is_zero_ether_addr(dev->dev_addr)) { 505 memcpy(dev->dev_addr, 506 local->hw.wiphy->perm_addr, 507 ETH_ALEN); 508 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 509 510 if (!is_valid_ether_addr(dev->dev_addr)) { 511 res = -EADDRNOTAVAIL; 512 goto err_stop; 513 } 514 } 515 516 switch (sdata->vif.type) { 517 case NL80211_IFTYPE_AP_VLAN: 518 /* no need to tell driver, but set carrier and chanctx */ 519 if (rtnl_dereference(sdata->bss->beacon)) { 520 ieee80211_vif_vlan_copy_chanctx(sdata); 521 netif_carrier_on(dev); 522 } else { 523 netif_carrier_off(dev); 524 } 525 break; 526 case NL80211_IFTYPE_MONITOR: 527 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 528 local->cooked_mntrs++; 529 break; 530 } 531 532 if (local->monitors == 0 && local->open_count == 0) { 533 res = ieee80211_add_virtual_monitor(local); 534 if (res) 535 goto err_stop; 536 } 537 538 /* must be before the call to ieee80211_configure_filter */ 539 local->monitors++; 540 if (local->monitors == 1) { 541 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 542 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 543 } 544 545 ieee80211_adjust_monitor_flags(sdata, 1); 546 ieee80211_configure_filter(local); 547 mutex_lock(&local->mtx); 548 ieee80211_recalc_idle(local); 549 mutex_unlock(&local->mtx); 550 551 netif_carrier_on(dev); 552 break; 553 default: 554 if (coming_up) { 555 ieee80211_del_virtual_monitor(local); 556 557 res = drv_add_interface(local, sdata); 558 if (res) 559 goto err_stop; 560 res = ieee80211_check_queues(sdata); 561 if (res) 562 goto err_del_interface; 563 } 564 565 drv_add_interface_debugfs(local, sdata); 566 567 if (sdata->vif.type == NL80211_IFTYPE_AP) { 568 local->fif_pspoll++; 569 local->fif_probe_req++; 570 571 ieee80211_configure_filter(local); 572 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 573 local->fif_probe_req++; 574 } 575 576 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 577 changed |= ieee80211_reset_erp_info(sdata); 578 ieee80211_bss_info_change_notify(sdata, changed); 579 580 switch (sdata->vif.type) { 581 case NL80211_IFTYPE_STATION: 582 case NL80211_IFTYPE_ADHOC: 583 case NL80211_IFTYPE_AP: 584 case NL80211_IFTYPE_MESH_POINT: 585 netif_carrier_off(dev); 586 break; 587 case NL80211_IFTYPE_WDS: 588 case NL80211_IFTYPE_P2P_DEVICE: 589 break; 590 default: 591 netif_carrier_on(dev); 592 } 593 594 /* 595 * set default queue parameters so drivers don't 596 * need to initialise the hardware if the hardware 597 * doesn't start up with sane defaults 598 */ 599 ieee80211_set_wmm_default(sdata, true); 600 } 601 602 set_bit(SDATA_STATE_RUNNING, &sdata->state); 603 604 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 605 /* Create STA entry for the WDS peer */ 606 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 607 GFP_KERNEL); 608 if (!sta) { 609 res = -ENOMEM; 610 goto err_del_interface; 611 } 612 613 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 614 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 615 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 616 617 res = sta_info_insert(sta); 618 if (res) { 619 /* STA has been freed */ 620 goto err_del_interface; 621 } 622 623 rate_control_rate_init(sta); 624 netif_carrier_on(dev); 625 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 626 rcu_assign_pointer(local->p2p_sdata, sdata); 627 } 628 629 /* 630 * set_multicast_list will be invoked by the networking core 631 * which will check whether any increments here were done in 632 * error and sync them down to the hardware as filter flags. 633 */ 634 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 635 atomic_inc(&local->iff_allmultis); 636 637 if (sdata->flags & IEEE80211_SDATA_PROMISC) 638 atomic_inc(&local->iff_promiscs); 639 640 if (coming_up) 641 local->open_count++; 642 643 if (hw_reconf_flags) 644 ieee80211_hw_config(local, hw_reconf_flags); 645 646 ieee80211_recalc_ps(local, -1); 647 648 if (dev) 649 netif_tx_start_all_queues(dev); 650 651 return 0; 652 err_del_interface: 653 drv_remove_interface(local, sdata); 654 err_stop: 655 if (!local->open_count) 656 drv_stop(local); 657 err_del_bss: 658 sdata->bss = NULL; 659 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 660 list_del(&sdata->u.vlan.list); 661 /* might already be clear but that doesn't matter */ 662 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 663 return res; 664 } 665 666 static int ieee80211_open(struct net_device *dev) 667 { 668 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 669 int err; 670 671 /* fail early if user set an invalid address */ 672 if (!is_valid_ether_addr(dev->dev_addr)) 673 return -EADDRNOTAVAIL; 674 675 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 676 if (err) 677 return err; 678 679 return ieee80211_do_open(&sdata->wdev, true); 680 } 681 682 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 683 bool going_down) 684 { 685 struct ieee80211_local *local = sdata->local; 686 unsigned long flags; 687 struct sk_buff *skb, *tmp; 688 u32 hw_reconf_flags = 0; 689 int i, flushed; 690 struct ps_data *ps; 691 692 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 693 694 if (rcu_access_pointer(local->scan_sdata) == sdata) 695 ieee80211_scan_cancel(local); 696 697 /* 698 * Stop TX on this interface first. 699 */ 700 if (sdata->dev) 701 netif_tx_stop_all_queues(sdata->dev); 702 703 ieee80211_roc_purge(sdata); 704 705 if (sdata->vif.type == NL80211_IFTYPE_STATION) 706 ieee80211_mgd_stop(sdata); 707 708 /* 709 * Remove all stations associated with this interface. 710 * 711 * This must be done before calling ops->remove_interface() 712 * because otherwise we can later invoke ops->sta_notify() 713 * whenever the STAs are removed, and that invalidates driver 714 * assumptions about always getting a vif pointer that is valid 715 * (because if we remove a STA after ops->remove_interface() 716 * the driver will have removed the vif info already!) 717 * 718 * This is relevant only in WDS mode, in all other modes we've 719 * already removed all stations when disconnecting or similar, 720 * so warn otherwise. 721 * 722 * We call sta_info_flush_cleanup() later, to combine RCU waits. 723 */ 724 flushed = sta_info_flush_defer(sdata); 725 WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) || 726 (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)); 727 728 /* 729 * Don't count this interface for promisc/allmulti while it 730 * is down. dev_mc_unsync() will invoke set_multicast_list 731 * on the master interface which will sync these down to the 732 * hardware as filter flags. 733 */ 734 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 735 atomic_dec(&local->iff_allmultis); 736 737 if (sdata->flags & IEEE80211_SDATA_PROMISC) 738 atomic_dec(&local->iff_promiscs); 739 740 if (sdata->vif.type == NL80211_IFTYPE_AP) { 741 local->fif_pspoll--; 742 local->fif_probe_req--; 743 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 744 local->fif_probe_req--; 745 } 746 747 if (sdata->dev) { 748 netif_addr_lock_bh(sdata->dev); 749 spin_lock_bh(&local->filter_lock); 750 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 751 sdata->dev->addr_len); 752 spin_unlock_bh(&local->filter_lock); 753 netif_addr_unlock_bh(sdata->dev); 754 755 ieee80211_configure_filter(local); 756 } 757 758 del_timer_sync(&local->dynamic_ps_timer); 759 cancel_work_sync(&local->dynamic_ps_enable_work); 760 761 cancel_work_sync(&sdata->recalc_smps); 762 763 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); 764 765 if (sdata->wdev.cac_started) { 766 mutex_lock(&local->iflist_mtx); 767 ieee80211_vif_release_channel(sdata); 768 mutex_unlock(&local->iflist_mtx); 769 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED, 770 GFP_KERNEL); 771 } 772 773 /* APs need special treatment */ 774 if (sdata->vif.type == NL80211_IFTYPE_AP) { 775 struct ieee80211_sub_if_data *vlan, *tmpsdata; 776 777 /* down all dependent devices, that is VLANs */ 778 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 779 u.vlan.list) 780 dev_close(vlan->dev); 781 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 782 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 783 /* remove all packets in parent bc_buf pointing to this dev */ 784 ps = &sdata->bss->ps; 785 786 spin_lock_irqsave(&ps->bc_buf.lock, flags); 787 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) { 788 if (skb->dev == sdata->dev) { 789 __skb_unlink(skb, &ps->bc_buf); 790 local->total_ps_buffered--; 791 ieee80211_free_txskb(&local->hw, skb); 792 } 793 } 794 spin_unlock_irqrestore(&ps->bc_buf.lock, flags); 795 } 796 797 if (going_down) 798 local->open_count--; 799 800 switch (sdata->vif.type) { 801 case NL80211_IFTYPE_AP_VLAN: 802 list_del(&sdata->u.vlan.list); 803 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL); 804 /* no need to tell driver */ 805 break; 806 case NL80211_IFTYPE_MONITOR: 807 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 808 local->cooked_mntrs--; 809 break; 810 } 811 812 local->monitors--; 813 if (local->monitors == 0) { 814 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 815 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 816 ieee80211_del_virtual_monitor(local); 817 } 818 819 ieee80211_adjust_monitor_flags(sdata, -1); 820 ieee80211_configure_filter(local); 821 mutex_lock(&local->mtx); 822 ieee80211_recalc_idle(local); 823 mutex_unlock(&local->mtx); 824 break; 825 case NL80211_IFTYPE_P2P_DEVICE: 826 /* relies on synchronize_rcu() below */ 827 rcu_assign_pointer(local->p2p_sdata, NULL); 828 /* fall through */ 829 default: 830 cancel_work_sync(&sdata->work); 831 /* 832 * When we get here, the interface is marked down. 833 * 834 * sta_info_flush_cleanup() requires rcu_barrier() 835 * first to wait for the station call_rcu() calls 836 * to complete, here we need at least sychronize_rcu() 837 * it to wait for the RX path in case it is using the 838 * interface and enqueuing frames at this very time on 839 * another CPU. 840 */ 841 rcu_barrier(); 842 sta_info_flush_cleanup(sdata); 843 844 skb_queue_purge(&sdata->skb_queue); 845 846 /* 847 * Free all remaining keys, there shouldn't be any, 848 * except maybe group keys in AP more or WDS? 849 */ 850 ieee80211_free_keys(sdata); 851 852 drv_remove_interface_debugfs(local, sdata); 853 854 if (going_down) 855 drv_remove_interface(local, sdata); 856 } 857 858 sdata->bss = NULL; 859 860 ieee80211_recalc_ps(local, -1); 861 862 if (local->open_count == 0) { 863 if (local->ops->napi_poll) 864 napi_disable(&local->napi); 865 ieee80211_clear_tx_pending(local); 866 ieee80211_stop_device(local); 867 868 /* no reconfiguring after stop! */ 869 hw_reconf_flags = 0; 870 } 871 872 /* do after stop to avoid reconfiguring when we stop anyway */ 873 if (hw_reconf_flags) 874 ieee80211_hw_config(local, hw_reconf_flags); 875 876 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 877 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 878 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 879 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 880 if (info->control.vif == &sdata->vif) { 881 __skb_unlink(skb, &local->pending[i]); 882 ieee80211_free_txskb(&local->hw, skb); 883 } 884 } 885 } 886 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 887 888 if (local->monitors == local->open_count && local->monitors > 0) 889 ieee80211_add_virtual_monitor(local); 890 } 891 892 static int ieee80211_stop(struct net_device *dev) 893 { 894 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 895 896 ieee80211_do_stop(sdata, true); 897 898 return 0; 899 } 900 901 static void ieee80211_set_multicast_list(struct net_device *dev) 902 { 903 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 904 struct ieee80211_local *local = sdata->local; 905 int allmulti, promisc, sdata_allmulti, sdata_promisc; 906 907 allmulti = !!(dev->flags & IFF_ALLMULTI); 908 promisc = !!(dev->flags & IFF_PROMISC); 909 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 910 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); 911 912 if (allmulti != sdata_allmulti) { 913 if (dev->flags & IFF_ALLMULTI) 914 atomic_inc(&local->iff_allmultis); 915 else 916 atomic_dec(&local->iff_allmultis); 917 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 918 } 919 920 if (promisc != sdata_promisc) { 921 if (dev->flags & IFF_PROMISC) 922 atomic_inc(&local->iff_promiscs); 923 else 924 atomic_dec(&local->iff_promiscs); 925 sdata->flags ^= IEEE80211_SDATA_PROMISC; 926 } 927 spin_lock_bh(&local->filter_lock); 928 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 929 spin_unlock_bh(&local->filter_lock); 930 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 931 } 932 933 /* 934 * Called when the netdev is removed or, by the code below, before 935 * the interface type changes. 936 */ 937 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 938 { 939 int flushed; 940 int i; 941 942 /* free extra data */ 943 ieee80211_free_keys(sdata); 944 945 ieee80211_debugfs_remove_netdev(sdata); 946 947 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 948 __skb_queue_purge(&sdata->fragments[i].skb_list); 949 sdata->fragment_next = 0; 950 951 if (ieee80211_vif_is_mesh(&sdata->vif)) 952 mesh_rmc_free(sdata); 953 954 flushed = sta_info_flush(sdata); 955 WARN_ON(flushed); 956 } 957 958 static void ieee80211_uninit(struct net_device *dev) 959 { 960 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 961 } 962 963 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 964 struct sk_buff *skb) 965 { 966 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 967 } 968 969 static const struct net_device_ops ieee80211_dataif_ops = { 970 .ndo_open = ieee80211_open, 971 .ndo_stop = ieee80211_stop, 972 .ndo_uninit = ieee80211_uninit, 973 .ndo_start_xmit = ieee80211_subif_start_xmit, 974 .ndo_set_rx_mode = ieee80211_set_multicast_list, 975 .ndo_change_mtu = ieee80211_change_mtu, 976 .ndo_set_mac_address = ieee80211_change_mac, 977 .ndo_select_queue = ieee80211_netdev_select_queue, 978 }; 979 980 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 981 struct sk_buff *skb) 982 { 983 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 984 struct ieee80211_local *local = sdata->local; 985 struct ieee80211_hdr *hdr; 986 struct ieee80211_radiotap_header *rtap = (void *)skb->data; 987 988 if (local->hw.queues < IEEE80211_NUM_ACS) 989 return 0; 990 991 if (skb->len < 4 || 992 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) 993 return 0; /* doesn't matter, frame will be dropped */ 994 995 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); 996 997 return ieee80211_select_queue_80211(sdata, skb, hdr); 998 } 999 1000 static const struct net_device_ops ieee80211_monitorif_ops = { 1001 .ndo_open = ieee80211_open, 1002 .ndo_stop = ieee80211_stop, 1003 .ndo_uninit = ieee80211_uninit, 1004 .ndo_start_xmit = ieee80211_monitor_start_xmit, 1005 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1006 .ndo_change_mtu = ieee80211_change_mtu, 1007 .ndo_set_mac_address = eth_mac_addr, 1008 .ndo_select_queue = ieee80211_monitor_select_queue, 1009 }; 1010 1011 static void ieee80211_if_setup(struct net_device *dev) 1012 { 1013 ether_setup(dev); 1014 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1015 dev->netdev_ops = &ieee80211_dataif_ops; 1016 dev->destructor = free_netdev; 1017 } 1018 1019 static void ieee80211_iface_work(struct work_struct *work) 1020 { 1021 struct ieee80211_sub_if_data *sdata = 1022 container_of(work, struct ieee80211_sub_if_data, work); 1023 struct ieee80211_local *local = sdata->local; 1024 struct sk_buff *skb; 1025 struct sta_info *sta; 1026 struct ieee80211_ra_tid *ra_tid; 1027 1028 if (!ieee80211_sdata_running(sdata)) 1029 return; 1030 1031 if (local->scanning) 1032 return; 1033 1034 /* 1035 * ieee80211_queue_work() should have picked up most cases, 1036 * here we'll pick the rest. 1037 */ 1038 if (WARN(local->suspended, 1039 "interface work scheduled while going to suspend\n")) 1040 return; 1041 1042 /* first process frames */ 1043 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1044 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1045 1046 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { 1047 ra_tid = (void *)&skb->cb; 1048 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, 1049 ra_tid->tid); 1050 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { 1051 ra_tid = (void *)&skb->cb; 1052 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, 1053 ra_tid->tid); 1054 } else if (ieee80211_is_action(mgmt->frame_control) && 1055 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1056 int len = skb->len; 1057 1058 mutex_lock(&local->sta_mtx); 1059 sta = sta_info_get_bss(sdata, mgmt->sa); 1060 if (sta) { 1061 switch (mgmt->u.action.u.addba_req.action_code) { 1062 case WLAN_ACTION_ADDBA_REQ: 1063 ieee80211_process_addba_request( 1064 local, sta, mgmt, len); 1065 break; 1066 case WLAN_ACTION_ADDBA_RESP: 1067 ieee80211_process_addba_resp(local, sta, 1068 mgmt, len); 1069 break; 1070 case WLAN_ACTION_DELBA: 1071 ieee80211_process_delba(sdata, sta, 1072 mgmt, len); 1073 break; 1074 default: 1075 WARN_ON(1); 1076 break; 1077 } 1078 } 1079 mutex_unlock(&local->sta_mtx); 1080 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1081 struct ieee80211_hdr *hdr = (void *)mgmt; 1082 /* 1083 * So the frame isn't mgmt, but frame_control 1084 * is at the right place anyway, of course, so 1085 * the if statement is correct. 1086 * 1087 * Warn if we have other data frame types here, 1088 * they must not get here. 1089 */ 1090 WARN_ON(hdr->frame_control & 1091 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1092 WARN_ON(!(hdr->seq_ctrl & 1093 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1094 /* 1095 * This was a fragment of a frame, received while 1096 * a block-ack session was active. That cannot be 1097 * right, so terminate the session. 1098 */ 1099 mutex_lock(&local->sta_mtx); 1100 sta = sta_info_get_bss(sdata, mgmt->sa); 1101 if (sta) { 1102 u16 tid = *ieee80211_get_qos_ctl(hdr) & 1103 IEEE80211_QOS_CTL_TID_MASK; 1104 1105 __ieee80211_stop_rx_ba_session( 1106 sta, tid, WLAN_BACK_RECIPIENT, 1107 WLAN_REASON_QSTA_REQUIRE_SETUP, 1108 true); 1109 } 1110 mutex_unlock(&local->sta_mtx); 1111 } else switch (sdata->vif.type) { 1112 case NL80211_IFTYPE_STATION: 1113 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1114 break; 1115 case NL80211_IFTYPE_ADHOC: 1116 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1117 break; 1118 case NL80211_IFTYPE_MESH_POINT: 1119 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1120 break; 1121 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1122 break; 1123 default: 1124 WARN(1, "frame for unexpected interface type"); 1125 break; 1126 } 1127 1128 kfree_skb(skb); 1129 } 1130 1131 /* then other type-dependent work */ 1132 switch (sdata->vif.type) { 1133 case NL80211_IFTYPE_STATION: 1134 ieee80211_sta_work(sdata); 1135 break; 1136 case NL80211_IFTYPE_ADHOC: 1137 ieee80211_ibss_work(sdata); 1138 break; 1139 case NL80211_IFTYPE_MESH_POINT: 1140 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1141 break; 1142 ieee80211_mesh_work(sdata); 1143 break; 1144 default: 1145 break; 1146 } 1147 } 1148 1149 static void ieee80211_recalc_smps_work(struct work_struct *work) 1150 { 1151 struct ieee80211_sub_if_data *sdata = 1152 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1153 1154 ieee80211_recalc_smps(sdata); 1155 } 1156 1157 /* 1158 * Helper function to initialise an interface to a specific type. 1159 */ 1160 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1161 enum nl80211_iftype type) 1162 { 1163 /* clear type-dependent union */ 1164 memset(&sdata->u, 0, sizeof(sdata->u)); 1165 1166 /* and set some type-dependent values */ 1167 sdata->vif.type = type; 1168 sdata->vif.p2p = false; 1169 sdata->wdev.iftype = type; 1170 1171 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1172 sdata->control_port_no_encrypt = false; 1173 1174 sdata->noack_map = 0; 1175 1176 /* only monitor/p2p-device differ */ 1177 if (sdata->dev) { 1178 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1179 sdata->dev->type = ARPHRD_ETHER; 1180 } 1181 1182 skb_queue_head_init(&sdata->skb_queue); 1183 INIT_WORK(&sdata->work, ieee80211_iface_work); 1184 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1185 1186 switch (type) { 1187 case NL80211_IFTYPE_P2P_GO: 1188 type = NL80211_IFTYPE_AP; 1189 sdata->vif.type = type; 1190 sdata->vif.p2p = true; 1191 /* fall through */ 1192 case NL80211_IFTYPE_AP: 1193 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1194 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1195 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1196 break; 1197 case NL80211_IFTYPE_P2P_CLIENT: 1198 type = NL80211_IFTYPE_STATION; 1199 sdata->vif.type = type; 1200 sdata->vif.p2p = true; 1201 /* fall through */ 1202 case NL80211_IFTYPE_STATION: 1203 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; 1204 ieee80211_sta_setup_sdata(sdata); 1205 break; 1206 case NL80211_IFTYPE_ADHOC: 1207 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; 1208 ieee80211_ibss_setup_sdata(sdata); 1209 break; 1210 case NL80211_IFTYPE_MESH_POINT: 1211 if (ieee80211_vif_is_mesh(&sdata->vif)) 1212 ieee80211_mesh_init_sdata(sdata); 1213 break; 1214 case NL80211_IFTYPE_MONITOR: 1215 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1216 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1217 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 1218 MONITOR_FLAG_OTHER_BSS; 1219 break; 1220 case NL80211_IFTYPE_WDS: 1221 sdata->vif.bss_conf.bssid = NULL; 1222 break; 1223 case NL80211_IFTYPE_AP_VLAN: 1224 break; 1225 case NL80211_IFTYPE_P2P_DEVICE: 1226 sdata->vif.bss_conf.bssid = sdata->vif.addr; 1227 break; 1228 case NL80211_IFTYPE_UNSPECIFIED: 1229 case NUM_NL80211_IFTYPES: 1230 BUG(); 1231 break; 1232 } 1233 1234 ieee80211_debugfs_add_netdev(sdata); 1235 } 1236 1237 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1238 enum nl80211_iftype type) 1239 { 1240 struct ieee80211_local *local = sdata->local; 1241 int ret, err; 1242 enum nl80211_iftype internal_type = type; 1243 bool p2p = false; 1244 1245 ASSERT_RTNL(); 1246 1247 if (!local->ops->change_interface) 1248 return -EBUSY; 1249 1250 switch (sdata->vif.type) { 1251 case NL80211_IFTYPE_AP: 1252 case NL80211_IFTYPE_STATION: 1253 case NL80211_IFTYPE_ADHOC: 1254 /* 1255 * Could maybe also all others here? 1256 * Just not sure how that interacts 1257 * with the RX/config path e.g. for 1258 * mesh. 1259 */ 1260 break; 1261 default: 1262 return -EBUSY; 1263 } 1264 1265 switch (type) { 1266 case NL80211_IFTYPE_AP: 1267 case NL80211_IFTYPE_STATION: 1268 case NL80211_IFTYPE_ADHOC: 1269 /* 1270 * Could probably support everything 1271 * but WDS here (WDS do_open can fail 1272 * under memory pressure, which this 1273 * code isn't prepared to handle). 1274 */ 1275 break; 1276 case NL80211_IFTYPE_P2P_CLIENT: 1277 p2p = true; 1278 internal_type = NL80211_IFTYPE_STATION; 1279 break; 1280 case NL80211_IFTYPE_P2P_GO: 1281 p2p = true; 1282 internal_type = NL80211_IFTYPE_AP; 1283 break; 1284 default: 1285 return -EBUSY; 1286 } 1287 1288 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1289 if (ret) 1290 return ret; 1291 1292 ieee80211_do_stop(sdata, false); 1293 1294 ieee80211_teardown_sdata(sdata); 1295 1296 ret = drv_change_interface(local, sdata, internal_type, p2p); 1297 if (ret) 1298 type = sdata->vif.type; 1299 1300 /* 1301 * Ignore return value here, there's not much we can do since 1302 * the driver changed the interface type internally already. 1303 * The warnings will hopefully make driver authors fix it :-) 1304 */ 1305 ieee80211_check_queues(sdata); 1306 1307 ieee80211_setup_sdata(sdata, type); 1308 1309 err = ieee80211_do_open(&sdata->wdev, false); 1310 WARN(err, "type change: do_open returned %d", err); 1311 1312 return ret; 1313 } 1314 1315 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1316 enum nl80211_iftype type) 1317 { 1318 int ret; 1319 1320 ASSERT_RTNL(); 1321 1322 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1323 return 0; 1324 1325 if (ieee80211_sdata_running(sdata)) { 1326 ret = ieee80211_runtime_change_iftype(sdata, type); 1327 if (ret) 1328 return ret; 1329 } else { 1330 /* Purge and reset type-dependent state. */ 1331 ieee80211_teardown_sdata(sdata); 1332 ieee80211_setup_sdata(sdata, type); 1333 } 1334 1335 /* reset some values that shouldn't be kept across type changes */ 1336 sdata->drop_unencrypted = 0; 1337 if (type == NL80211_IFTYPE_STATION) 1338 sdata->u.mgd.use_4addr = false; 1339 1340 return 0; 1341 } 1342 1343 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1344 u8 *perm_addr, enum nl80211_iftype type) 1345 { 1346 struct ieee80211_sub_if_data *sdata; 1347 u64 mask, start, addr, val, inc; 1348 u8 *m; 1349 u8 tmp_addr[ETH_ALEN]; 1350 int i; 1351 1352 /* default ... something at least */ 1353 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1354 1355 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1356 local->hw.wiphy->n_addresses <= 1) 1357 return; 1358 1359 mutex_lock(&local->iflist_mtx); 1360 1361 switch (type) { 1362 case NL80211_IFTYPE_MONITOR: 1363 /* doesn't matter */ 1364 break; 1365 case NL80211_IFTYPE_WDS: 1366 case NL80211_IFTYPE_AP_VLAN: 1367 /* match up with an AP interface */ 1368 list_for_each_entry(sdata, &local->interfaces, list) { 1369 if (sdata->vif.type != NL80211_IFTYPE_AP) 1370 continue; 1371 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1372 break; 1373 } 1374 /* keep default if no AP interface present */ 1375 break; 1376 case NL80211_IFTYPE_P2P_CLIENT: 1377 case NL80211_IFTYPE_P2P_GO: 1378 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) { 1379 list_for_each_entry(sdata, &local->interfaces, list) { 1380 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1381 continue; 1382 if (!ieee80211_sdata_running(sdata)) 1383 continue; 1384 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1385 goto out_unlock; 1386 } 1387 } 1388 /* otherwise fall through */ 1389 default: 1390 /* assign a new address if possible -- try n_addresses first */ 1391 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1392 bool used = false; 1393 1394 list_for_each_entry(sdata, &local->interfaces, list) { 1395 if (memcmp(local->hw.wiphy->addresses[i].addr, 1396 sdata->vif.addr, ETH_ALEN) == 0) { 1397 used = true; 1398 break; 1399 } 1400 } 1401 1402 if (!used) { 1403 memcpy(perm_addr, 1404 local->hw.wiphy->addresses[i].addr, 1405 ETH_ALEN); 1406 break; 1407 } 1408 } 1409 1410 /* try mask if available */ 1411 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1412 break; 1413 1414 m = local->hw.wiphy->addr_mask; 1415 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1416 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1417 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1418 1419 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1420 /* not a contiguous mask ... not handled now! */ 1421 pr_info("not contiguous\n"); 1422 break; 1423 } 1424 1425 m = local->hw.wiphy->perm_addr; 1426 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1427 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1428 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1429 1430 inc = 1ULL<<__ffs64(mask); 1431 val = (start & mask); 1432 addr = (start & ~mask) | (val & mask); 1433 do { 1434 bool used = false; 1435 1436 tmp_addr[5] = addr >> 0*8; 1437 tmp_addr[4] = addr >> 1*8; 1438 tmp_addr[3] = addr >> 2*8; 1439 tmp_addr[2] = addr >> 3*8; 1440 tmp_addr[1] = addr >> 4*8; 1441 tmp_addr[0] = addr >> 5*8; 1442 1443 val += inc; 1444 1445 list_for_each_entry(sdata, &local->interfaces, list) { 1446 if (memcmp(tmp_addr, sdata->vif.addr, 1447 ETH_ALEN) == 0) { 1448 used = true; 1449 break; 1450 } 1451 } 1452 1453 if (!used) { 1454 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1455 break; 1456 } 1457 addr = (start & ~mask) | (val & mask); 1458 } while (addr != start); 1459 1460 break; 1461 } 1462 1463 out_unlock: 1464 mutex_unlock(&local->iflist_mtx); 1465 } 1466 1467 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk) 1468 { 1469 struct ieee80211_sub_if_data *sdata; 1470 1471 sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk); 1472 1473 ieee80211_cleanup_sdata_stas(sdata); 1474 } 1475 1476 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1477 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1478 struct vif_params *params) 1479 { 1480 struct net_device *ndev = NULL; 1481 struct ieee80211_sub_if_data *sdata = NULL; 1482 int ret, i; 1483 int txqs = 1; 1484 1485 ASSERT_RTNL(); 1486 1487 if (type == NL80211_IFTYPE_P2P_DEVICE) { 1488 struct wireless_dev *wdev; 1489 1490 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1491 GFP_KERNEL); 1492 if (!sdata) 1493 return -ENOMEM; 1494 wdev = &sdata->wdev; 1495 1496 sdata->dev = NULL; 1497 strlcpy(sdata->name, name, IFNAMSIZ); 1498 ieee80211_assign_perm_addr(local, wdev->address, type); 1499 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1500 } else { 1501 if (local->hw.queues >= IEEE80211_NUM_ACS) 1502 txqs = IEEE80211_NUM_ACS; 1503 1504 ndev = alloc_netdev_mqs(sizeof(*sdata) + 1505 local->hw.vif_data_size, 1506 name, ieee80211_if_setup, txqs, 1); 1507 if (!ndev) 1508 return -ENOMEM; 1509 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1510 1511 ndev->needed_headroom = local->tx_headroom + 1512 4*6 /* four MAC addresses */ 1513 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1514 + 6 /* mesh */ 1515 + 8 /* rfc1042/bridge tunnel */ 1516 - ETH_HLEN /* ethernet hard_header_len */ 1517 + IEEE80211_ENCRYPT_HEADROOM; 1518 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1519 1520 ret = dev_alloc_name(ndev, ndev->name); 1521 if (ret < 0) { 1522 free_netdev(ndev); 1523 return ret; 1524 } 1525 1526 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1527 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1528 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1529 1530 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1531 sdata = netdev_priv(ndev); 1532 ndev->ieee80211_ptr = &sdata->wdev; 1533 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1534 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1535 1536 sdata->dev = ndev; 1537 } 1538 1539 /* initialise type-independent data */ 1540 sdata->wdev.wiphy = local->hw.wiphy; 1541 sdata->local = local; 1542 1543 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1544 skb_queue_head_init(&sdata->fragments[i].skb_list); 1545 1546 INIT_LIST_HEAD(&sdata->key_list); 1547 1548 spin_lock_init(&sdata->cleanup_stations_lock); 1549 INIT_LIST_HEAD(&sdata->cleanup_stations); 1550 INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk); 1551 INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work, 1552 ieee80211_dfs_cac_timer_work); 1553 1554 for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 1555 struct ieee80211_supported_band *sband; 1556 sband = local->hw.wiphy->bands[i]; 1557 sdata->rc_rateidx_mask[i] = 1558 sband ? (1 << sband->n_bitrates) - 1 : 0; 1559 if (sband) 1560 memcpy(sdata->rc_rateidx_mcs_mask[i], 1561 sband->ht_cap.mcs.rx_mask, 1562 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1563 else 1564 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1565 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1566 } 1567 1568 ieee80211_set_default_queues(sdata); 1569 1570 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1571 sdata->user_power_level = local->user_power_level; 1572 1573 /* setup type-dependent data */ 1574 ieee80211_setup_sdata(sdata, type); 1575 1576 if (ndev) { 1577 if (params) { 1578 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1579 if (type == NL80211_IFTYPE_STATION) 1580 sdata->u.mgd.use_4addr = params->use_4addr; 1581 } 1582 1583 ndev->features |= local->hw.netdev_features; 1584 1585 ret = register_netdevice(ndev); 1586 if (ret) { 1587 free_netdev(ndev); 1588 return ret; 1589 } 1590 } 1591 1592 mutex_lock(&local->iflist_mtx); 1593 list_add_tail_rcu(&sdata->list, &local->interfaces); 1594 mutex_unlock(&local->iflist_mtx); 1595 1596 if (new_wdev) 1597 *new_wdev = &sdata->wdev; 1598 1599 return 0; 1600 } 1601 1602 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1603 { 1604 ASSERT_RTNL(); 1605 1606 mutex_lock(&sdata->local->iflist_mtx); 1607 list_del_rcu(&sdata->list); 1608 mutex_unlock(&sdata->local->iflist_mtx); 1609 1610 synchronize_rcu(); 1611 1612 if (sdata->dev) { 1613 unregister_netdevice(sdata->dev); 1614 } else { 1615 cfg80211_unregister_wdev(&sdata->wdev); 1616 kfree(sdata); 1617 } 1618 } 1619 1620 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 1621 { 1622 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 1623 return; 1624 ieee80211_do_stop(sdata, true); 1625 ieee80211_teardown_sdata(sdata); 1626 } 1627 1628 /* 1629 * Remove all interfaces, may only be called at hardware unregistration 1630 * time because it doesn't do RCU-safe list removals. 1631 */ 1632 void ieee80211_remove_interfaces(struct ieee80211_local *local) 1633 { 1634 struct ieee80211_sub_if_data *sdata, *tmp; 1635 LIST_HEAD(unreg_list); 1636 LIST_HEAD(wdev_list); 1637 1638 ASSERT_RTNL(); 1639 1640 mutex_lock(&local->iflist_mtx); 1641 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1642 list_del(&sdata->list); 1643 1644 if (sdata->dev) 1645 unregister_netdevice_queue(sdata->dev, &unreg_list); 1646 else 1647 list_add(&sdata->list, &wdev_list); 1648 } 1649 mutex_unlock(&local->iflist_mtx); 1650 unregister_netdevice_many(&unreg_list); 1651 list_del(&unreg_list); 1652 1653 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 1654 list_del(&sdata->list); 1655 cfg80211_unregister_wdev(&sdata->wdev); 1656 kfree(sdata); 1657 } 1658 } 1659 1660 static int netdev_notify(struct notifier_block *nb, 1661 unsigned long state, 1662 void *ndev) 1663 { 1664 struct net_device *dev = ndev; 1665 struct ieee80211_sub_if_data *sdata; 1666 1667 if (state != NETDEV_CHANGENAME) 1668 return 0; 1669 1670 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1671 return 0; 1672 1673 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1674 return 0; 1675 1676 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1677 1678 memcpy(sdata->name, dev->name, IFNAMSIZ); 1679 1680 ieee80211_debugfs_rename_netdev(sdata); 1681 return 0; 1682 } 1683 1684 static struct notifier_block mac80211_netdev_notifier = { 1685 .notifier_call = netdev_notify, 1686 }; 1687 1688 int ieee80211_iface_init(void) 1689 { 1690 return register_netdevice_notifier(&mac80211_netdev_notifier); 1691 } 1692 1693 void ieee80211_iface_exit(void) 1694 { 1695 unregister_netdevice_notifier(&mac80211_netdev_notifier); 1696 } 1697