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 const char *reason) 83 { 84 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 85 return 0; 86 87 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 88 return IEEE80211_CONF_CHANGE_IDLE; 89 } 90 91 static u32 ieee80211_idle_on(struct ieee80211_local *local) 92 { 93 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 94 return 0; 95 96 drv_flush(local, false); 97 98 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 99 return IEEE80211_CONF_CHANGE_IDLE; 100 } 101 102 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local) 103 { 104 struct ieee80211_sub_if_data *sdata; 105 int count = 0; 106 bool working = false, scanning = false; 107 unsigned int led_trig_start = 0, led_trig_stop = 0; 108 struct ieee80211_roc_work *roc; 109 110 #ifdef CONFIG_PROVE_LOCKING 111 WARN_ON(debug_locks && !lockdep_rtnl_is_held() && 112 !lockdep_is_held(&local->iflist_mtx)); 113 #endif 114 lockdep_assert_held(&local->mtx); 115 116 list_for_each_entry(sdata, &local->interfaces, list) { 117 if (!ieee80211_sdata_running(sdata)) { 118 sdata->vif.bss_conf.idle = true; 119 continue; 120 } 121 122 sdata->old_idle = sdata->vif.bss_conf.idle; 123 124 /* do not count disabled managed interfaces */ 125 if (sdata->vif.type == NL80211_IFTYPE_STATION && 126 !sdata->u.mgd.associated && 127 !sdata->u.mgd.auth_data && 128 !sdata->u.mgd.assoc_data) { 129 sdata->vif.bss_conf.idle = true; 130 continue; 131 } 132 /* do not count unused IBSS interfaces */ 133 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && 134 !sdata->u.ibss.ssid_len) { 135 sdata->vif.bss_conf.idle = true; 136 continue; 137 } 138 139 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) 140 continue; 141 142 /* count everything else */ 143 sdata->vif.bss_conf.idle = false; 144 count++; 145 } 146 147 if (!local->ops->remain_on_channel) { 148 list_for_each_entry(roc, &local->roc_list, list) { 149 working = true; 150 roc->sdata->vif.bss_conf.idle = false; 151 } 152 } 153 154 sdata = rcu_dereference_protected(local->scan_sdata, 155 lockdep_is_held(&local->mtx)); 156 if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) { 157 scanning = true; 158 sdata->vif.bss_conf.idle = false; 159 } 160 161 list_for_each_entry(sdata, &local->interfaces, list) { 162 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 163 sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 164 sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) 165 continue; 166 if (sdata->old_idle == sdata->vif.bss_conf.idle) 167 continue; 168 if (!ieee80211_sdata_running(sdata)) 169 continue; 170 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE); 171 } 172 173 if (working || scanning) 174 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 175 else 176 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 177 178 if (count) 179 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 180 else 181 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 182 183 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 184 185 if (working) 186 return ieee80211_idle_off(local, "working"); 187 if (scanning) 188 return ieee80211_idle_off(local, "scanning"); 189 if (!count) 190 return ieee80211_idle_on(local); 191 else 192 return ieee80211_idle_off(local, "in use"); 193 194 return 0; 195 } 196 197 void ieee80211_recalc_idle(struct ieee80211_local *local) 198 { 199 u32 chg; 200 201 mutex_lock(&local->iflist_mtx); 202 chg = __ieee80211_recalc_idle(local); 203 mutex_unlock(&local->iflist_mtx); 204 if (chg) 205 ieee80211_hw_config(local, chg); 206 } 207 208 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) 209 { 210 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) 211 return -EINVAL; 212 213 dev->mtu = new_mtu; 214 return 0; 215 } 216 217 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr) 218 { 219 struct ieee80211_sub_if_data *sdata; 220 u64 new, mask, tmp; 221 u8 *m; 222 int ret = 0; 223 224 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 225 return 0; 226 227 m = addr; 228 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 229 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 230 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 231 232 m = local->hw.wiphy->addr_mask; 233 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 234 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 235 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 236 237 238 mutex_lock(&local->iflist_mtx); 239 list_for_each_entry(sdata, &local->interfaces, list) { 240 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 241 continue; 242 243 m = sdata->vif.addr; 244 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 245 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 246 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 247 248 if ((new & ~mask) != (tmp & ~mask)) { 249 ret = -EINVAL; 250 break; 251 } 252 } 253 mutex_unlock(&local->iflist_mtx); 254 255 return ret; 256 } 257 258 static int ieee80211_change_mac(struct net_device *dev, void *addr) 259 { 260 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 261 struct sockaddr *sa = addr; 262 int ret; 263 264 if (ieee80211_sdata_running(sdata)) 265 return -EBUSY; 266 267 ret = ieee80211_verify_mac(sdata->local, sa->sa_data); 268 if (ret) 269 return ret; 270 271 ret = eth_mac_addr(dev, sa); 272 273 if (ret == 0) 274 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 275 276 return ret; 277 } 278 279 static inline int identical_mac_addr_allowed(int type1, int type2) 280 { 281 return type1 == NL80211_IFTYPE_MONITOR || 282 type2 == NL80211_IFTYPE_MONITOR || 283 type1 == NL80211_IFTYPE_P2P_DEVICE || 284 type2 == NL80211_IFTYPE_P2P_DEVICE || 285 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || 286 (type1 == NL80211_IFTYPE_WDS && 287 (type2 == NL80211_IFTYPE_WDS || 288 type2 == NL80211_IFTYPE_AP)) || 289 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 290 (type1 == NL80211_IFTYPE_AP_VLAN && 291 (type2 == NL80211_IFTYPE_AP || 292 type2 == NL80211_IFTYPE_AP_VLAN)); 293 } 294 295 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 296 enum nl80211_iftype iftype) 297 { 298 struct ieee80211_local *local = sdata->local; 299 struct ieee80211_sub_if_data *nsdata; 300 301 ASSERT_RTNL(); 302 303 /* we hold the RTNL here so can safely walk the list */ 304 list_for_each_entry(nsdata, &local->interfaces, list) { 305 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) { 306 /* 307 * Allow only a single IBSS interface to be up at any 308 * time. This is restricted because beacon distribution 309 * cannot work properly if both are in the same IBSS. 310 * 311 * To remove this restriction we'd have to disallow them 312 * from setting the same SSID on different IBSS interfaces 313 * belonging to the same hardware. Then, however, we're 314 * faced with having to adopt two different TSF timers... 315 */ 316 if (iftype == NL80211_IFTYPE_ADHOC && 317 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 318 return -EBUSY; 319 320 /* 321 * The remaining checks are only performed for interfaces 322 * with the same MAC address. 323 */ 324 if (!ether_addr_equal(sdata->vif.addr, 325 nsdata->vif.addr)) 326 continue; 327 328 /* 329 * check whether it may have the same address 330 */ 331 if (!identical_mac_addr_allowed(iftype, 332 nsdata->vif.type)) 333 return -ENOTUNIQ; 334 335 /* 336 * can only add VLANs to enabled APs 337 */ 338 if (iftype == NL80211_IFTYPE_AP_VLAN && 339 nsdata->vif.type == NL80211_IFTYPE_AP) 340 sdata->bss = &nsdata->u.ap; 341 } 342 } 343 344 return 0; 345 } 346 347 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata) 348 { 349 int n_queues = sdata->local->hw.queues; 350 int i; 351 352 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) { 353 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 354 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 355 IEEE80211_INVAL_HW_QUEUE)) 356 return -EINVAL; 357 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 358 n_queues)) 359 return -EINVAL; 360 } 361 } 362 363 if ((sdata->vif.type != NL80211_IFTYPE_AP) || 364 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) { 365 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 366 return 0; 367 } 368 369 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 370 return -EINVAL; 371 372 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 373 return -EINVAL; 374 375 return 0; 376 } 377 378 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 379 const int offset) 380 { 381 struct ieee80211_local *local = sdata->local; 382 u32 flags = sdata->u.mntr_flags; 383 384 #define ADJUST(_f, _s) do { \ 385 if (flags & MONITOR_FLAG_##_f) \ 386 local->fif_##_s += offset; \ 387 } while (0) 388 389 ADJUST(FCSFAIL, fcsfail); 390 ADJUST(PLCPFAIL, plcpfail); 391 ADJUST(CONTROL, control); 392 ADJUST(CONTROL, pspoll); 393 ADJUST(OTHER_BSS, other_bss); 394 395 #undef ADJUST 396 } 397 398 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 399 { 400 struct ieee80211_local *local = sdata->local; 401 int i; 402 403 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 404 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 405 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 406 else if (local->hw.queues >= IEEE80211_NUM_ACS) 407 sdata->vif.hw_queue[i] = i; 408 else 409 sdata->vif.hw_queue[i] = 0; 410 } 411 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 412 } 413 414 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 415 { 416 struct ieee80211_sub_if_data *sdata; 417 int ret = 0; 418 419 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 420 return 0; 421 422 mutex_lock(&local->iflist_mtx); 423 424 if (local->monitor_sdata) 425 goto out_unlock; 426 427 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 428 if (!sdata) { 429 ret = -ENOMEM; 430 goto out_unlock; 431 } 432 433 /* set up data */ 434 sdata->local = local; 435 sdata->vif.type = NL80211_IFTYPE_MONITOR; 436 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 437 wiphy_name(local->hw.wiphy)); 438 439 ieee80211_set_default_queues(sdata); 440 441 ret = drv_add_interface(local, sdata); 442 if (WARN_ON(ret)) { 443 /* ok .. stupid driver, it asked for this! */ 444 kfree(sdata); 445 goto out_unlock; 446 } 447 448 ret = ieee80211_check_queues(sdata); 449 if (ret) { 450 kfree(sdata); 451 goto out_unlock; 452 } 453 454 ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef, 455 IEEE80211_CHANCTX_EXCLUSIVE); 456 if (ret) { 457 drv_remove_interface(local, sdata); 458 kfree(sdata); 459 goto out_unlock; 460 } 461 462 rcu_assign_pointer(local->monitor_sdata, sdata); 463 out_unlock: 464 mutex_unlock(&local->iflist_mtx); 465 return ret; 466 } 467 468 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 469 { 470 struct ieee80211_sub_if_data *sdata; 471 472 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 473 return; 474 475 mutex_lock(&local->iflist_mtx); 476 477 sdata = rcu_dereference_protected(local->monitor_sdata, 478 lockdep_is_held(&local->iflist_mtx)); 479 if (!sdata) 480 goto out_unlock; 481 482 rcu_assign_pointer(local->monitor_sdata, NULL); 483 synchronize_net(); 484 485 ieee80211_vif_release_channel(sdata); 486 487 drv_remove_interface(local, sdata); 488 489 kfree(sdata); 490 out_unlock: 491 mutex_unlock(&local->iflist_mtx); 492 } 493 494 /* 495 * NOTE: Be very careful when changing this function, it must NOT return 496 * an error on interface type changes that have been pre-checked, so most 497 * checks should be in ieee80211_check_concurrent_iface. 498 */ 499 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) 500 { 501 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 502 struct net_device *dev = wdev->netdev; 503 struct ieee80211_local *local = sdata->local; 504 struct sta_info *sta; 505 u32 changed = 0; 506 int res; 507 u32 hw_reconf_flags = 0; 508 509 switch (sdata->vif.type) { 510 case NL80211_IFTYPE_WDS: 511 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 512 return -ENOLINK; 513 break; 514 case NL80211_IFTYPE_AP_VLAN: { 515 struct ieee80211_sub_if_data *master; 516 517 if (!sdata->bss) 518 return -ENOLINK; 519 520 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 521 522 master = container_of(sdata->bss, 523 struct ieee80211_sub_if_data, u.ap); 524 sdata->control_port_protocol = 525 master->control_port_protocol; 526 sdata->control_port_no_encrypt = 527 master->control_port_no_encrypt; 528 break; 529 } 530 case NL80211_IFTYPE_AP: 531 sdata->bss = &sdata->u.ap; 532 break; 533 case NL80211_IFTYPE_MESH_POINT: 534 case NL80211_IFTYPE_STATION: 535 case NL80211_IFTYPE_MONITOR: 536 case NL80211_IFTYPE_ADHOC: 537 case NL80211_IFTYPE_P2P_DEVICE: 538 /* no special treatment */ 539 break; 540 case NL80211_IFTYPE_UNSPECIFIED: 541 case NUM_NL80211_IFTYPES: 542 case NL80211_IFTYPE_P2P_CLIENT: 543 case NL80211_IFTYPE_P2P_GO: 544 /* cannot happen */ 545 WARN_ON(1); 546 break; 547 } 548 549 if (local->open_count == 0) { 550 res = drv_start(local); 551 if (res) 552 goto err_del_bss; 553 if (local->ops->napi_poll) 554 napi_enable(&local->napi); 555 /* we're brought up, everything changes */ 556 hw_reconf_flags = ~0; 557 ieee80211_led_radio(local, true); 558 ieee80211_mod_tpt_led_trig(local, 559 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 560 } 561 562 /* 563 * Copy the hopefully now-present MAC address to 564 * this interface, if it has the special null one. 565 */ 566 if (dev && is_zero_ether_addr(dev->dev_addr)) { 567 memcpy(dev->dev_addr, 568 local->hw.wiphy->perm_addr, 569 ETH_ALEN); 570 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 571 572 if (!is_valid_ether_addr(dev->dev_addr)) { 573 res = -EADDRNOTAVAIL; 574 goto err_stop; 575 } 576 } 577 578 switch (sdata->vif.type) { 579 case NL80211_IFTYPE_AP_VLAN: 580 /* no need to tell driver, but set carrier and chanctx */ 581 if (rtnl_dereference(sdata->bss->beacon)) { 582 ieee80211_vif_vlan_copy_chanctx(sdata); 583 netif_carrier_on(dev); 584 } else { 585 netif_carrier_off(dev); 586 } 587 break; 588 case NL80211_IFTYPE_MONITOR: 589 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 590 local->cooked_mntrs++; 591 break; 592 } 593 594 if (local->monitors == 0 && local->open_count == 0) { 595 res = ieee80211_add_virtual_monitor(local); 596 if (res) 597 goto err_stop; 598 } 599 600 /* must be before the call to ieee80211_configure_filter */ 601 local->monitors++; 602 if (local->monitors == 1) { 603 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 604 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 605 } 606 607 ieee80211_adjust_monitor_flags(sdata, 1); 608 ieee80211_configure_filter(local); 609 610 netif_carrier_on(dev); 611 break; 612 default: 613 if (coming_up) { 614 ieee80211_del_virtual_monitor(local); 615 616 res = drv_add_interface(local, sdata); 617 if (res) 618 goto err_stop; 619 res = ieee80211_check_queues(sdata); 620 if (res) 621 goto err_del_interface; 622 } 623 624 if (sdata->vif.type == NL80211_IFTYPE_AP) { 625 local->fif_pspoll++; 626 local->fif_probe_req++; 627 628 ieee80211_configure_filter(local); 629 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 630 local->fif_probe_req++; 631 } 632 633 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 634 changed |= ieee80211_reset_erp_info(sdata); 635 ieee80211_bss_info_change_notify(sdata, changed); 636 637 switch (sdata->vif.type) { 638 case NL80211_IFTYPE_STATION: 639 case NL80211_IFTYPE_ADHOC: 640 case NL80211_IFTYPE_AP: 641 case NL80211_IFTYPE_MESH_POINT: 642 netif_carrier_off(dev); 643 break; 644 case NL80211_IFTYPE_WDS: 645 case NL80211_IFTYPE_P2P_DEVICE: 646 break; 647 default: 648 netif_carrier_on(dev); 649 } 650 651 /* 652 * set default queue parameters so drivers don't 653 * need to initialise the hardware if the hardware 654 * doesn't start up with sane defaults 655 */ 656 ieee80211_set_wmm_default(sdata, true); 657 } 658 659 set_bit(SDATA_STATE_RUNNING, &sdata->state); 660 661 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 662 /* Create STA entry for the WDS peer */ 663 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 664 GFP_KERNEL); 665 if (!sta) { 666 res = -ENOMEM; 667 goto err_del_interface; 668 } 669 670 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 671 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 672 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 673 674 res = sta_info_insert(sta); 675 if (res) { 676 /* STA has been freed */ 677 goto err_del_interface; 678 } 679 680 rate_control_rate_init(sta); 681 netif_carrier_on(dev); 682 } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { 683 rcu_assign_pointer(local->p2p_sdata, sdata); 684 } 685 686 /* 687 * set_multicast_list will be invoked by the networking core 688 * which will check whether any increments here were done in 689 * error and sync them down to the hardware as filter flags. 690 */ 691 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 692 atomic_inc(&local->iff_allmultis); 693 694 if (sdata->flags & IEEE80211_SDATA_PROMISC) 695 atomic_inc(&local->iff_promiscs); 696 697 mutex_lock(&local->mtx); 698 hw_reconf_flags |= __ieee80211_recalc_idle(local); 699 mutex_unlock(&local->mtx); 700 701 if (coming_up) 702 local->open_count++; 703 704 if (hw_reconf_flags) 705 ieee80211_hw_config(local, hw_reconf_flags); 706 707 ieee80211_recalc_ps(local, -1); 708 709 if (dev) 710 netif_tx_start_all_queues(dev); 711 712 return 0; 713 err_del_interface: 714 drv_remove_interface(local, sdata); 715 err_stop: 716 if (!local->open_count) 717 drv_stop(local); 718 err_del_bss: 719 sdata->bss = NULL; 720 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 721 list_del(&sdata->u.vlan.list); 722 /* might already be clear but that doesn't matter */ 723 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 724 return res; 725 } 726 727 static int ieee80211_open(struct net_device *dev) 728 { 729 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 730 int err; 731 732 /* fail early if user set an invalid address */ 733 if (!is_valid_ether_addr(dev->dev_addr)) 734 return -EADDRNOTAVAIL; 735 736 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 737 if (err) 738 return err; 739 740 return ieee80211_do_open(&sdata->wdev, true); 741 } 742 743 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 744 bool going_down) 745 { 746 struct ieee80211_local *local = sdata->local; 747 unsigned long flags; 748 struct sk_buff *skb, *tmp; 749 u32 hw_reconf_flags = 0; 750 int i; 751 752 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 753 754 if (rcu_access_pointer(local->scan_sdata) == sdata) 755 ieee80211_scan_cancel(local); 756 757 /* 758 * Stop TX on this interface first. 759 */ 760 if (sdata->dev) 761 netif_tx_stop_all_queues(sdata->dev); 762 763 ieee80211_roc_purge(sdata); 764 765 /* 766 * Remove all stations associated with this interface. 767 * 768 * This must be done before calling ops->remove_interface() 769 * because otherwise we can later invoke ops->sta_notify() 770 * whenever the STAs are removed, and that invalidates driver 771 * assumptions about always getting a vif pointer that is valid 772 * (because if we remove a STA after ops->remove_interface() 773 * the driver will have removed the vif info already!) 774 * 775 * This is relevant only in AP, WDS and mesh modes, since in 776 * all other modes we've already removed all stations when 777 * disconnecting etc. 778 */ 779 sta_info_flush(local, sdata); 780 781 /* 782 * Don't count this interface for promisc/allmulti while it 783 * is down. dev_mc_unsync() will invoke set_multicast_list 784 * on the master interface which will sync these down to the 785 * hardware as filter flags. 786 */ 787 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 788 atomic_dec(&local->iff_allmultis); 789 790 if (sdata->flags & IEEE80211_SDATA_PROMISC) 791 atomic_dec(&local->iff_promiscs); 792 793 if (sdata->vif.type == NL80211_IFTYPE_AP) { 794 local->fif_pspoll--; 795 local->fif_probe_req--; 796 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 797 local->fif_probe_req--; 798 } 799 800 if (sdata->dev) { 801 netif_addr_lock_bh(sdata->dev); 802 spin_lock_bh(&local->filter_lock); 803 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 804 sdata->dev->addr_len); 805 spin_unlock_bh(&local->filter_lock); 806 netif_addr_unlock_bh(sdata->dev); 807 808 ieee80211_configure_filter(local); 809 } 810 811 del_timer_sync(&local->dynamic_ps_timer); 812 cancel_work_sync(&local->dynamic_ps_enable_work); 813 814 cancel_work_sync(&sdata->recalc_smps); 815 816 /* APs need special treatment */ 817 if (sdata->vif.type == NL80211_IFTYPE_AP) { 818 struct ieee80211_sub_if_data *vlan, *tmpsdata; 819 820 /* down all dependent devices, that is VLANs */ 821 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 822 u.vlan.list) 823 dev_close(vlan->dev); 824 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 825 } else if (sdata->vif.type == NL80211_IFTYPE_STATION) { 826 ieee80211_mgd_stop(sdata); 827 } 828 829 if (going_down) 830 local->open_count--; 831 832 switch (sdata->vif.type) { 833 case NL80211_IFTYPE_AP_VLAN: 834 list_del(&sdata->u.vlan.list); 835 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL); 836 /* no need to tell driver */ 837 break; 838 case NL80211_IFTYPE_MONITOR: 839 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 840 local->cooked_mntrs--; 841 break; 842 } 843 844 local->monitors--; 845 if (local->monitors == 0) { 846 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 847 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 848 ieee80211_del_virtual_monitor(local); 849 } 850 851 ieee80211_adjust_monitor_flags(sdata, -1); 852 ieee80211_configure_filter(local); 853 break; 854 case NL80211_IFTYPE_P2P_DEVICE: 855 /* relies on synchronize_rcu() below */ 856 rcu_assign_pointer(local->p2p_sdata, NULL); 857 /* fall through */ 858 default: 859 cancel_work_sync(&sdata->work); 860 /* 861 * When we get here, the interface is marked down. 862 * Call synchronize_rcu() to wait for the RX path 863 * should it be using the interface and enqueuing 864 * frames at this very time on another CPU. 865 */ 866 synchronize_rcu(); 867 skb_queue_purge(&sdata->skb_queue); 868 869 /* 870 * Free all remaining keys, there shouldn't be any, 871 * except maybe group keys in AP more or WDS? 872 */ 873 ieee80211_free_keys(sdata); 874 875 if (going_down) 876 drv_remove_interface(local, sdata); 877 } 878 879 sdata->bss = NULL; 880 881 mutex_lock(&local->mtx); 882 hw_reconf_flags |= __ieee80211_recalc_idle(local); 883 mutex_unlock(&local->mtx); 884 885 ieee80211_recalc_ps(local, -1); 886 887 if (local->open_count == 0) { 888 if (local->ops->napi_poll) 889 napi_disable(&local->napi); 890 ieee80211_clear_tx_pending(local); 891 ieee80211_stop_device(local); 892 893 /* no reconfiguring after stop! */ 894 hw_reconf_flags = 0; 895 } 896 897 /* do after stop to avoid reconfiguring when we stop anyway */ 898 if (hw_reconf_flags) 899 ieee80211_hw_config(local, hw_reconf_flags); 900 901 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 902 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 903 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 904 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 905 if (info->control.vif == &sdata->vif) { 906 __skb_unlink(skb, &local->pending[i]); 907 ieee80211_free_txskb(&local->hw, skb); 908 } 909 } 910 } 911 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 912 913 if (local->monitors == local->open_count && local->monitors > 0) 914 ieee80211_add_virtual_monitor(local); 915 } 916 917 static int ieee80211_stop(struct net_device *dev) 918 { 919 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 920 921 ieee80211_do_stop(sdata, true); 922 923 return 0; 924 } 925 926 static void ieee80211_set_multicast_list(struct net_device *dev) 927 { 928 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 929 struct ieee80211_local *local = sdata->local; 930 int allmulti, promisc, sdata_allmulti, sdata_promisc; 931 932 allmulti = !!(dev->flags & IFF_ALLMULTI); 933 promisc = !!(dev->flags & IFF_PROMISC); 934 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 935 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); 936 937 if (allmulti != sdata_allmulti) { 938 if (dev->flags & IFF_ALLMULTI) 939 atomic_inc(&local->iff_allmultis); 940 else 941 atomic_dec(&local->iff_allmultis); 942 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 943 } 944 945 if (promisc != sdata_promisc) { 946 if (dev->flags & IFF_PROMISC) 947 atomic_inc(&local->iff_promiscs); 948 else 949 atomic_dec(&local->iff_promiscs); 950 sdata->flags ^= IEEE80211_SDATA_PROMISC; 951 } 952 spin_lock_bh(&local->filter_lock); 953 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 954 spin_unlock_bh(&local->filter_lock); 955 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 956 } 957 958 /* 959 * Called when the netdev is removed or, by the code below, before 960 * the interface type changes. 961 */ 962 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata) 963 { 964 struct ieee80211_local *local = sdata->local; 965 int flushed; 966 int i; 967 968 /* free extra data */ 969 ieee80211_free_keys(sdata); 970 971 ieee80211_debugfs_remove_netdev(sdata); 972 973 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 974 __skb_queue_purge(&sdata->fragments[i].skb_list); 975 sdata->fragment_next = 0; 976 977 if (ieee80211_vif_is_mesh(&sdata->vif)) 978 mesh_rmc_free(sdata); 979 980 flushed = sta_info_flush(local, sdata); 981 WARN_ON(flushed); 982 } 983 984 static void ieee80211_uninit(struct net_device *dev) 985 { 986 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev)); 987 } 988 989 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 990 struct sk_buff *skb) 991 { 992 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 993 } 994 995 static const struct net_device_ops ieee80211_dataif_ops = { 996 .ndo_open = ieee80211_open, 997 .ndo_stop = ieee80211_stop, 998 .ndo_uninit = ieee80211_uninit, 999 .ndo_start_xmit = ieee80211_subif_start_xmit, 1000 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1001 .ndo_change_mtu = ieee80211_change_mtu, 1002 .ndo_set_mac_address = ieee80211_change_mac, 1003 .ndo_select_queue = ieee80211_netdev_select_queue, 1004 }; 1005 1006 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 1007 struct sk_buff *skb) 1008 { 1009 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1010 struct ieee80211_local *local = sdata->local; 1011 struct ieee80211_hdr *hdr; 1012 struct ieee80211_radiotap_header *rtap = (void *)skb->data; 1013 1014 if (local->hw.queues < IEEE80211_NUM_ACS) 1015 return 0; 1016 1017 if (skb->len < 4 || 1018 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) 1019 return 0; /* doesn't matter, frame will be dropped */ 1020 1021 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); 1022 1023 return ieee80211_select_queue_80211(sdata, skb, hdr); 1024 } 1025 1026 static const struct net_device_ops ieee80211_monitorif_ops = { 1027 .ndo_open = ieee80211_open, 1028 .ndo_stop = ieee80211_stop, 1029 .ndo_uninit = ieee80211_uninit, 1030 .ndo_start_xmit = ieee80211_monitor_start_xmit, 1031 .ndo_set_rx_mode = ieee80211_set_multicast_list, 1032 .ndo_change_mtu = ieee80211_change_mtu, 1033 .ndo_set_mac_address = eth_mac_addr, 1034 .ndo_select_queue = ieee80211_monitor_select_queue, 1035 }; 1036 1037 static void ieee80211_if_setup(struct net_device *dev) 1038 { 1039 ether_setup(dev); 1040 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1041 dev->netdev_ops = &ieee80211_dataif_ops; 1042 dev->destructor = free_netdev; 1043 } 1044 1045 static void ieee80211_iface_work(struct work_struct *work) 1046 { 1047 struct ieee80211_sub_if_data *sdata = 1048 container_of(work, struct ieee80211_sub_if_data, work); 1049 struct ieee80211_local *local = sdata->local; 1050 struct sk_buff *skb; 1051 struct sta_info *sta; 1052 struct ieee80211_ra_tid *ra_tid; 1053 1054 if (!ieee80211_sdata_running(sdata)) 1055 return; 1056 1057 if (local->scanning) 1058 return; 1059 1060 /* 1061 * ieee80211_queue_work() should have picked up most cases, 1062 * here we'll pick the rest. 1063 */ 1064 if (WARN(local->suspended, 1065 "interface work scheduled while going to suspend\n")) 1066 return; 1067 1068 /* first process frames */ 1069 while ((skb = skb_dequeue(&sdata->skb_queue))) { 1070 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1071 1072 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { 1073 ra_tid = (void *)&skb->cb; 1074 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, 1075 ra_tid->tid); 1076 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { 1077 ra_tid = (void *)&skb->cb; 1078 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, 1079 ra_tid->tid); 1080 } else if (ieee80211_is_action(mgmt->frame_control) && 1081 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 1082 int len = skb->len; 1083 1084 mutex_lock(&local->sta_mtx); 1085 sta = sta_info_get_bss(sdata, mgmt->sa); 1086 if (sta) { 1087 switch (mgmt->u.action.u.addba_req.action_code) { 1088 case WLAN_ACTION_ADDBA_REQ: 1089 ieee80211_process_addba_request( 1090 local, sta, mgmt, len); 1091 break; 1092 case WLAN_ACTION_ADDBA_RESP: 1093 ieee80211_process_addba_resp(local, sta, 1094 mgmt, len); 1095 break; 1096 case WLAN_ACTION_DELBA: 1097 ieee80211_process_delba(sdata, sta, 1098 mgmt, len); 1099 break; 1100 default: 1101 WARN_ON(1); 1102 break; 1103 } 1104 } 1105 mutex_unlock(&local->sta_mtx); 1106 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 1107 struct ieee80211_hdr *hdr = (void *)mgmt; 1108 /* 1109 * So the frame isn't mgmt, but frame_control 1110 * is at the right place anyway, of course, so 1111 * the if statement is correct. 1112 * 1113 * Warn if we have other data frame types here, 1114 * they must not get here. 1115 */ 1116 WARN_ON(hdr->frame_control & 1117 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 1118 WARN_ON(!(hdr->seq_ctrl & 1119 cpu_to_le16(IEEE80211_SCTL_FRAG))); 1120 /* 1121 * This was a fragment of a frame, received while 1122 * a block-ack session was active. That cannot be 1123 * right, so terminate the session. 1124 */ 1125 mutex_lock(&local->sta_mtx); 1126 sta = sta_info_get_bss(sdata, mgmt->sa); 1127 if (sta) { 1128 u16 tid = *ieee80211_get_qos_ctl(hdr) & 1129 IEEE80211_QOS_CTL_TID_MASK; 1130 1131 __ieee80211_stop_rx_ba_session( 1132 sta, tid, WLAN_BACK_RECIPIENT, 1133 WLAN_REASON_QSTA_REQUIRE_SETUP, 1134 true); 1135 } 1136 mutex_unlock(&local->sta_mtx); 1137 } else switch (sdata->vif.type) { 1138 case NL80211_IFTYPE_STATION: 1139 ieee80211_sta_rx_queued_mgmt(sdata, skb); 1140 break; 1141 case NL80211_IFTYPE_ADHOC: 1142 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 1143 break; 1144 case NL80211_IFTYPE_MESH_POINT: 1145 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1146 break; 1147 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 1148 break; 1149 default: 1150 WARN(1, "frame for unexpected interface type"); 1151 break; 1152 } 1153 1154 kfree_skb(skb); 1155 } 1156 1157 /* then other type-dependent work */ 1158 switch (sdata->vif.type) { 1159 case NL80211_IFTYPE_STATION: 1160 ieee80211_sta_work(sdata); 1161 break; 1162 case NL80211_IFTYPE_ADHOC: 1163 ieee80211_ibss_work(sdata); 1164 break; 1165 case NL80211_IFTYPE_MESH_POINT: 1166 if (!ieee80211_vif_is_mesh(&sdata->vif)) 1167 break; 1168 ieee80211_mesh_work(sdata); 1169 break; 1170 default: 1171 break; 1172 } 1173 } 1174 1175 static void ieee80211_recalc_smps_work(struct work_struct *work) 1176 { 1177 struct ieee80211_sub_if_data *sdata = 1178 container_of(work, struct ieee80211_sub_if_data, recalc_smps); 1179 1180 ieee80211_recalc_smps(sdata); 1181 } 1182 1183 /* 1184 * Helper function to initialise an interface to a specific type. 1185 */ 1186 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 1187 enum nl80211_iftype type) 1188 { 1189 /* clear type-dependent union */ 1190 memset(&sdata->u, 0, sizeof(sdata->u)); 1191 1192 /* and set some type-dependent values */ 1193 sdata->vif.type = type; 1194 sdata->vif.p2p = false; 1195 sdata->wdev.iftype = type; 1196 1197 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 1198 sdata->control_port_no_encrypt = false; 1199 1200 sdata->noack_map = 0; 1201 1202 /* only monitor/p2p-device differ */ 1203 if (sdata->dev) { 1204 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 1205 sdata->dev->type = ARPHRD_ETHER; 1206 } 1207 1208 skb_queue_head_init(&sdata->skb_queue); 1209 INIT_WORK(&sdata->work, ieee80211_iface_work); 1210 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work); 1211 1212 switch (type) { 1213 case NL80211_IFTYPE_P2P_GO: 1214 type = NL80211_IFTYPE_AP; 1215 sdata->vif.type = type; 1216 sdata->vif.p2p = true; 1217 /* fall through */ 1218 case NL80211_IFTYPE_AP: 1219 skb_queue_head_init(&sdata->u.ap.ps.bc_buf); 1220 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1221 break; 1222 case NL80211_IFTYPE_P2P_CLIENT: 1223 type = NL80211_IFTYPE_STATION; 1224 sdata->vif.type = type; 1225 sdata->vif.p2p = true; 1226 /* fall through */ 1227 case NL80211_IFTYPE_STATION: 1228 ieee80211_sta_setup_sdata(sdata); 1229 break; 1230 case NL80211_IFTYPE_ADHOC: 1231 ieee80211_ibss_setup_sdata(sdata); 1232 break; 1233 case NL80211_IFTYPE_MESH_POINT: 1234 if (ieee80211_vif_is_mesh(&sdata->vif)) 1235 ieee80211_mesh_init_sdata(sdata); 1236 break; 1237 case NL80211_IFTYPE_MONITOR: 1238 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1239 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1240 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 1241 MONITOR_FLAG_OTHER_BSS; 1242 break; 1243 case NL80211_IFTYPE_WDS: 1244 case NL80211_IFTYPE_AP_VLAN: 1245 case NL80211_IFTYPE_P2P_DEVICE: 1246 break; 1247 case NL80211_IFTYPE_UNSPECIFIED: 1248 case NUM_NL80211_IFTYPES: 1249 BUG(); 1250 break; 1251 } 1252 1253 ieee80211_debugfs_add_netdev(sdata); 1254 } 1255 1256 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1257 enum nl80211_iftype type) 1258 { 1259 struct ieee80211_local *local = sdata->local; 1260 int ret, err; 1261 enum nl80211_iftype internal_type = type; 1262 bool p2p = false; 1263 1264 ASSERT_RTNL(); 1265 1266 if (!local->ops->change_interface) 1267 return -EBUSY; 1268 1269 switch (sdata->vif.type) { 1270 case NL80211_IFTYPE_AP: 1271 case NL80211_IFTYPE_STATION: 1272 case NL80211_IFTYPE_ADHOC: 1273 /* 1274 * Could maybe also all others here? 1275 * Just not sure how that interacts 1276 * with the RX/config path e.g. for 1277 * mesh. 1278 */ 1279 break; 1280 default: 1281 return -EBUSY; 1282 } 1283 1284 switch (type) { 1285 case NL80211_IFTYPE_AP: 1286 case NL80211_IFTYPE_STATION: 1287 case NL80211_IFTYPE_ADHOC: 1288 /* 1289 * Could probably support everything 1290 * but WDS here (WDS do_open can fail 1291 * under memory pressure, which this 1292 * code isn't prepared to handle). 1293 */ 1294 break; 1295 case NL80211_IFTYPE_P2P_CLIENT: 1296 p2p = true; 1297 internal_type = NL80211_IFTYPE_STATION; 1298 break; 1299 case NL80211_IFTYPE_P2P_GO: 1300 p2p = true; 1301 internal_type = NL80211_IFTYPE_AP; 1302 break; 1303 default: 1304 return -EBUSY; 1305 } 1306 1307 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1308 if (ret) 1309 return ret; 1310 1311 ieee80211_do_stop(sdata, false); 1312 1313 ieee80211_teardown_sdata(sdata); 1314 1315 ret = drv_change_interface(local, sdata, internal_type, p2p); 1316 if (ret) 1317 type = sdata->vif.type; 1318 1319 /* 1320 * Ignore return value here, there's not much we can do since 1321 * the driver changed the interface type internally already. 1322 * The warnings will hopefully make driver authors fix it :-) 1323 */ 1324 ieee80211_check_queues(sdata); 1325 1326 ieee80211_setup_sdata(sdata, type); 1327 1328 err = ieee80211_do_open(&sdata->wdev, false); 1329 WARN(err, "type change: do_open returned %d", err); 1330 1331 return ret; 1332 } 1333 1334 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1335 enum nl80211_iftype type) 1336 { 1337 int ret; 1338 1339 ASSERT_RTNL(); 1340 1341 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1342 return 0; 1343 1344 if (ieee80211_sdata_running(sdata)) { 1345 ret = ieee80211_runtime_change_iftype(sdata, type); 1346 if (ret) 1347 return ret; 1348 } else { 1349 /* Purge and reset type-dependent state. */ 1350 ieee80211_teardown_sdata(sdata); 1351 ieee80211_setup_sdata(sdata, type); 1352 } 1353 1354 /* reset some values that shouldn't be kept across type changes */ 1355 sdata->drop_unencrypted = 0; 1356 if (type == NL80211_IFTYPE_STATION) 1357 sdata->u.mgd.use_4addr = false; 1358 1359 return 0; 1360 } 1361 1362 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1363 u8 *perm_addr, enum nl80211_iftype type) 1364 { 1365 struct ieee80211_sub_if_data *sdata; 1366 u64 mask, start, addr, val, inc; 1367 u8 *m; 1368 u8 tmp_addr[ETH_ALEN]; 1369 int i; 1370 1371 /* default ... something at least */ 1372 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1373 1374 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1375 local->hw.wiphy->n_addresses <= 1) 1376 return; 1377 1378 mutex_lock(&local->iflist_mtx); 1379 1380 switch (type) { 1381 case NL80211_IFTYPE_MONITOR: 1382 /* doesn't matter */ 1383 break; 1384 case NL80211_IFTYPE_WDS: 1385 case NL80211_IFTYPE_AP_VLAN: 1386 /* match up with an AP interface */ 1387 list_for_each_entry(sdata, &local->interfaces, list) { 1388 if (sdata->vif.type != NL80211_IFTYPE_AP) 1389 continue; 1390 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1391 break; 1392 } 1393 /* keep default if no AP interface present */ 1394 break; 1395 case NL80211_IFTYPE_P2P_CLIENT: 1396 case NL80211_IFTYPE_P2P_GO: 1397 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) { 1398 list_for_each_entry(sdata, &local->interfaces, list) { 1399 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) 1400 continue; 1401 if (!ieee80211_sdata_running(sdata)) 1402 continue; 1403 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN); 1404 goto out_unlock; 1405 } 1406 } 1407 /* otherwise fall through */ 1408 default: 1409 /* assign a new address if possible -- try n_addresses first */ 1410 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1411 bool used = false; 1412 1413 list_for_each_entry(sdata, &local->interfaces, list) { 1414 if (memcmp(local->hw.wiphy->addresses[i].addr, 1415 sdata->vif.addr, ETH_ALEN) == 0) { 1416 used = true; 1417 break; 1418 } 1419 } 1420 1421 if (!used) { 1422 memcpy(perm_addr, 1423 local->hw.wiphy->addresses[i].addr, 1424 ETH_ALEN); 1425 break; 1426 } 1427 } 1428 1429 /* try mask if available */ 1430 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1431 break; 1432 1433 m = local->hw.wiphy->addr_mask; 1434 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1435 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1436 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1437 1438 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1439 /* not a contiguous mask ... not handled now! */ 1440 pr_info("not contiguous\n"); 1441 break; 1442 } 1443 1444 m = local->hw.wiphy->perm_addr; 1445 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1446 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1447 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1448 1449 inc = 1ULL<<__ffs64(mask); 1450 val = (start & mask); 1451 addr = (start & ~mask) | (val & mask); 1452 do { 1453 bool used = false; 1454 1455 tmp_addr[5] = addr >> 0*8; 1456 tmp_addr[4] = addr >> 1*8; 1457 tmp_addr[3] = addr >> 2*8; 1458 tmp_addr[2] = addr >> 3*8; 1459 tmp_addr[1] = addr >> 4*8; 1460 tmp_addr[0] = addr >> 5*8; 1461 1462 val += inc; 1463 1464 list_for_each_entry(sdata, &local->interfaces, list) { 1465 if (memcmp(tmp_addr, sdata->vif.addr, 1466 ETH_ALEN) == 0) { 1467 used = true; 1468 break; 1469 } 1470 } 1471 1472 if (!used) { 1473 memcpy(perm_addr, tmp_addr, ETH_ALEN); 1474 break; 1475 } 1476 addr = (start & ~mask) | (val & mask); 1477 } while (addr != start); 1478 1479 break; 1480 } 1481 1482 out_unlock: 1483 mutex_unlock(&local->iflist_mtx); 1484 } 1485 1486 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk) 1487 { 1488 struct ieee80211_sub_if_data *sdata; 1489 1490 sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk); 1491 1492 ieee80211_cleanup_sdata_stas(sdata); 1493 } 1494 1495 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1496 struct wireless_dev **new_wdev, enum nl80211_iftype type, 1497 struct vif_params *params) 1498 { 1499 struct net_device *ndev = NULL; 1500 struct ieee80211_sub_if_data *sdata = NULL; 1501 int ret, i; 1502 int txqs = 1; 1503 1504 ASSERT_RTNL(); 1505 1506 if (type == NL80211_IFTYPE_P2P_DEVICE) { 1507 struct wireless_dev *wdev; 1508 1509 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, 1510 GFP_KERNEL); 1511 if (!sdata) 1512 return -ENOMEM; 1513 wdev = &sdata->wdev; 1514 1515 sdata->dev = NULL; 1516 strlcpy(sdata->name, name, IFNAMSIZ); 1517 ieee80211_assign_perm_addr(local, wdev->address, type); 1518 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN); 1519 } else { 1520 if (local->hw.queues >= IEEE80211_NUM_ACS) 1521 txqs = IEEE80211_NUM_ACS; 1522 1523 ndev = alloc_netdev_mqs(sizeof(*sdata) + 1524 local->hw.vif_data_size, 1525 name, ieee80211_if_setup, txqs, 1); 1526 if (!ndev) 1527 return -ENOMEM; 1528 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1529 1530 ndev->needed_headroom = local->tx_headroom + 1531 4*6 /* four MAC addresses */ 1532 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1533 + 6 /* mesh */ 1534 + 8 /* rfc1042/bridge tunnel */ 1535 - ETH_HLEN /* ethernet hard_header_len */ 1536 + IEEE80211_ENCRYPT_HEADROOM; 1537 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1538 1539 ret = dev_alloc_name(ndev, ndev->name); 1540 if (ret < 0) { 1541 free_netdev(ndev); 1542 return ret; 1543 } 1544 1545 ieee80211_assign_perm_addr(local, ndev->perm_addr, type); 1546 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1547 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1548 1549 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */ 1550 sdata = netdev_priv(ndev); 1551 ndev->ieee80211_ptr = &sdata->wdev; 1552 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1553 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1554 1555 sdata->dev = ndev; 1556 } 1557 1558 /* initialise type-independent data */ 1559 sdata->wdev.wiphy = local->hw.wiphy; 1560 sdata->local = local; 1561 #ifdef CONFIG_INET 1562 sdata->arp_filter_state = true; 1563 #endif 1564 1565 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1566 skb_queue_head_init(&sdata->fragments[i].skb_list); 1567 1568 INIT_LIST_HEAD(&sdata->key_list); 1569 1570 spin_lock_init(&sdata->cleanup_stations_lock); 1571 INIT_LIST_HEAD(&sdata->cleanup_stations); 1572 INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk); 1573 1574 for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 1575 struct ieee80211_supported_band *sband; 1576 sband = local->hw.wiphy->bands[i]; 1577 sdata->rc_rateidx_mask[i] = 1578 sband ? (1 << sband->n_bitrates) - 1 : 0; 1579 if (sband) 1580 memcpy(sdata->rc_rateidx_mcs_mask[i], 1581 sband->ht_cap.mcs.rx_mask, 1582 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1583 else 1584 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1585 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1586 } 1587 1588 ieee80211_set_default_queues(sdata); 1589 1590 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1591 sdata->user_power_level = local->user_power_level; 1592 1593 /* setup type-dependent data */ 1594 ieee80211_setup_sdata(sdata, type); 1595 1596 if (ndev) { 1597 if (params) { 1598 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1599 if (type == NL80211_IFTYPE_STATION) 1600 sdata->u.mgd.use_4addr = params->use_4addr; 1601 } 1602 1603 ndev->features |= local->hw.netdev_features; 1604 1605 ret = register_netdevice(ndev); 1606 if (ret) { 1607 free_netdev(ndev); 1608 return ret; 1609 } 1610 } 1611 1612 mutex_lock(&local->iflist_mtx); 1613 list_add_tail_rcu(&sdata->list, &local->interfaces); 1614 mutex_unlock(&local->iflist_mtx); 1615 1616 if (new_wdev) 1617 *new_wdev = &sdata->wdev; 1618 1619 return 0; 1620 } 1621 1622 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1623 { 1624 ASSERT_RTNL(); 1625 1626 mutex_lock(&sdata->local->iflist_mtx); 1627 list_del_rcu(&sdata->list); 1628 mutex_unlock(&sdata->local->iflist_mtx); 1629 1630 synchronize_rcu(); 1631 1632 if (sdata->dev) { 1633 unregister_netdevice(sdata->dev); 1634 } else { 1635 cfg80211_unregister_wdev(&sdata->wdev); 1636 kfree(sdata); 1637 } 1638 } 1639 1640 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata) 1641 { 1642 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state))) 1643 return; 1644 ieee80211_do_stop(sdata, true); 1645 ieee80211_teardown_sdata(sdata); 1646 } 1647 1648 /* 1649 * Remove all interfaces, may only be called at hardware unregistration 1650 * time because it doesn't do RCU-safe list removals. 1651 */ 1652 void ieee80211_remove_interfaces(struct ieee80211_local *local) 1653 { 1654 struct ieee80211_sub_if_data *sdata, *tmp; 1655 LIST_HEAD(unreg_list); 1656 LIST_HEAD(wdev_list); 1657 1658 ASSERT_RTNL(); 1659 1660 mutex_lock(&local->iflist_mtx); 1661 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1662 list_del(&sdata->list); 1663 1664 if (sdata->dev) 1665 unregister_netdevice_queue(sdata->dev, &unreg_list); 1666 else 1667 list_add(&sdata->list, &wdev_list); 1668 } 1669 mutex_unlock(&local->iflist_mtx); 1670 unregister_netdevice_many(&unreg_list); 1671 list_del(&unreg_list); 1672 1673 list_for_each_entry_safe(sdata, tmp, &wdev_list, list) { 1674 list_del(&sdata->list); 1675 cfg80211_unregister_wdev(&sdata->wdev); 1676 kfree(sdata); 1677 } 1678 } 1679 1680 static int netdev_notify(struct notifier_block *nb, 1681 unsigned long state, 1682 void *ndev) 1683 { 1684 struct net_device *dev = ndev; 1685 struct ieee80211_sub_if_data *sdata; 1686 1687 if (state != NETDEV_CHANGENAME) 1688 return 0; 1689 1690 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1691 return 0; 1692 1693 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1694 return 0; 1695 1696 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1697 1698 memcpy(sdata->name, dev->name, IFNAMSIZ); 1699 1700 ieee80211_debugfs_rename_netdev(sdata); 1701 return 0; 1702 } 1703 1704 static struct notifier_block mac80211_netdev_notifier = { 1705 .notifier_call = netdev_notify, 1706 }; 1707 1708 int ieee80211_iface_init(void) 1709 { 1710 return register_netdevice_notifier(&mac80211_netdev_notifier); 1711 } 1712 1713 void ieee80211_iface_exit(void) 1714 { 1715 unregister_netdevice_notifier(&mac80211_netdev_notifier); 1716 } 1717