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 46 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) 47 { 48 int meshhdrlen; 49 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 50 51 meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0; 52 53 /* FIX: what would be proper limits for MTU? 54 * This interface uses 802.3 frames. */ 55 if (new_mtu < 256 || 56 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) { 57 return -EINVAL; 58 } 59 60 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 61 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu); 62 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 63 dev->mtu = new_mtu; 64 return 0; 65 } 66 67 static int ieee80211_change_mac(struct net_device *dev, void *addr) 68 { 69 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 70 struct sockaddr *sa = addr; 71 int ret; 72 73 if (ieee80211_sdata_running(sdata)) 74 return -EBUSY; 75 76 ret = eth_mac_addr(dev, sa); 77 78 if (ret == 0) 79 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); 80 81 return ret; 82 } 83 84 static inline int identical_mac_addr_allowed(int type1, int type2) 85 { 86 return type1 == NL80211_IFTYPE_MONITOR || 87 type2 == NL80211_IFTYPE_MONITOR || 88 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) || 89 (type1 == NL80211_IFTYPE_WDS && 90 (type2 == NL80211_IFTYPE_WDS || 91 type2 == NL80211_IFTYPE_AP)) || 92 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) || 93 (type1 == NL80211_IFTYPE_AP_VLAN && 94 (type2 == NL80211_IFTYPE_AP || 95 type2 == NL80211_IFTYPE_AP_VLAN)); 96 } 97 98 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata, 99 enum nl80211_iftype iftype) 100 { 101 struct ieee80211_local *local = sdata->local; 102 struct ieee80211_sub_if_data *nsdata; 103 struct net_device *dev = sdata->dev; 104 105 ASSERT_RTNL(); 106 107 /* we hold the RTNL here so can safely walk the list */ 108 list_for_each_entry(nsdata, &local->interfaces, list) { 109 struct net_device *ndev = nsdata->dev; 110 111 if (ndev != dev && ieee80211_sdata_running(nsdata)) { 112 /* 113 * Allow only a single IBSS interface to be up at any 114 * time. This is restricted because beacon distribution 115 * cannot work properly if both are in the same IBSS. 116 * 117 * To remove this restriction we'd have to disallow them 118 * from setting the same SSID on different IBSS interfaces 119 * belonging to the same hardware. Then, however, we're 120 * faced with having to adopt two different TSF timers... 121 */ 122 if (iftype == NL80211_IFTYPE_ADHOC && 123 nsdata->vif.type == NL80211_IFTYPE_ADHOC) 124 return -EBUSY; 125 126 /* 127 * The remaining checks are only performed for interfaces 128 * with the same MAC address. 129 */ 130 if (!ether_addr_equal(dev->dev_addr, ndev->dev_addr)) 131 continue; 132 133 /* 134 * check whether it may have the same address 135 */ 136 if (!identical_mac_addr_allowed(iftype, 137 nsdata->vif.type)) 138 return -ENOTUNIQ; 139 140 /* 141 * can only add VLANs to enabled APs 142 */ 143 if (iftype == NL80211_IFTYPE_AP_VLAN && 144 nsdata->vif.type == NL80211_IFTYPE_AP) 145 sdata->bss = &nsdata->u.ap; 146 } 147 } 148 149 return 0; 150 } 151 152 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata) 153 { 154 int n_queues = sdata->local->hw.queues; 155 int i; 156 157 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 158 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] == 159 IEEE80211_INVAL_HW_QUEUE)) 160 return -EINVAL; 161 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >= 162 n_queues)) 163 return -EINVAL; 164 } 165 166 if ((sdata->vif.type != NL80211_IFTYPE_AP) || 167 !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) { 168 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 169 return 0; 170 } 171 172 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE)) 173 return -EINVAL; 174 175 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues)) 176 return -EINVAL; 177 178 return 0; 179 } 180 181 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata, 182 const int offset) 183 { 184 struct ieee80211_local *local = sdata->local; 185 u32 flags = sdata->u.mntr_flags; 186 187 #define ADJUST(_f, _s) do { \ 188 if (flags & MONITOR_FLAG_##_f) \ 189 local->fif_##_s += offset; \ 190 } while (0) 191 192 ADJUST(FCSFAIL, fcsfail); 193 ADJUST(PLCPFAIL, plcpfail); 194 ADJUST(CONTROL, control); 195 ADJUST(CONTROL, pspoll); 196 ADJUST(OTHER_BSS, other_bss); 197 198 #undef ADJUST 199 } 200 201 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 202 { 203 struct ieee80211_local *local = sdata->local; 204 int i; 205 206 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 207 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 208 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE; 209 else if (local->hw.queues >= IEEE80211_NUM_ACS) 210 sdata->vif.hw_queue[i] = i; 211 else 212 sdata->vif.hw_queue[i] = 0; 213 } 214 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE; 215 } 216 217 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 218 { 219 struct ieee80211_sub_if_data *sdata; 220 int ret; 221 222 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 223 return 0; 224 225 if (local->monitor_sdata) 226 return 0; 227 228 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL); 229 if (!sdata) 230 return -ENOMEM; 231 232 /* set up data */ 233 sdata->local = local; 234 sdata->vif.type = NL80211_IFTYPE_MONITOR; 235 snprintf(sdata->name, IFNAMSIZ, "%s-monitor", 236 wiphy_name(local->hw.wiphy)); 237 238 ieee80211_set_default_queues(sdata); 239 240 ret = drv_add_interface(local, sdata); 241 if (WARN_ON(ret)) { 242 /* ok .. stupid driver, it asked for this! */ 243 kfree(sdata); 244 return ret; 245 } 246 247 ret = ieee80211_check_queues(sdata); 248 if (ret) { 249 kfree(sdata); 250 return ret; 251 } 252 253 rcu_assign_pointer(local->monitor_sdata, sdata); 254 255 return 0; 256 } 257 258 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 259 { 260 struct ieee80211_sub_if_data *sdata; 261 262 if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF)) 263 return; 264 265 sdata = rtnl_dereference(local->monitor_sdata); 266 267 if (!sdata) 268 return; 269 270 rcu_assign_pointer(local->monitor_sdata, NULL); 271 synchronize_net(); 272 273 drv_remove_interface(local, sdata); 274 275 kfree(sdata); 276 } 277 278 /* 279 * NOTE: Be very careful when changing this function, it must NOT return 280 * an error on interface type changes that have been pre-checked, so most 281 * checks should be in ieee80211_check_concurrent_iface. 282 */ 283 static int ieee80211_do_open(struct net_device *dev, bool coming_up) 284 { 285 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 286 struct ieee80211_local *local = sdata->local; 287 struct sta_info *sta; 288 u32 changed = 0; 289 int res; 290 u32 hw_reconf_flags = 0; 291 292 switch (sdata->vif.type) { 293 case NL80211_IFTYPE_WDS: 294 if (!is_valid_ether_addr(sdata->u.wds.remote_addr)) 295 return -ENOLINK; 296 break; 297 case NL80211_IFTYPE_AP_VLAN: { 298 struct ieee80211_sub_if_data *master; 299 300 if (!sdata->bss) 301 return -ENOLINK; 302 303 list_add(&sdata->u.vlan.list, &sdata->bss->vlans); 304 305 master = container_of(sdata->bss, 306 struct ieee80211_sub_if_data, u.ap); 307 sdata->control_port_protocol = 308 master->control_port_protocol; 309 sdata->control_port_no_encrypt = 310 master->control_port_no_encrypt; 311 break; 312 } 313 case NL80211_IFTYPE_AP: 314 sdata->bss = &sdata->u.ap; 315 break; 316 case NL80211_IFTYPE_MESH_POINT: 317 case NL80211_IFTYPE_STATION: 318 case NL80211_IFTYPE_MONITOR: 319 case NL80211_IFTYPE_ADHOC: 320 /* no special treatment */ 321 break; 322 case NL80211_IFTYPE_UNSPECIFIED: 323 case NUM_NL80211_IFTYPES: 324 case NL80211_IFTYPE_P2P_CLIENT: 325 case NL80211_IFTYPE_P2P_GO: 326 /* cannot happen */ 327 WARN_ON(1); 328 break; 329 } 330 331 if (local->open_count == 0) { 332 res = drv_start(local); 333 if (res) 334 goto err_del_bss; 335 if (local->ops->napi_poll) 336 napi_enable(&local->napi); 337 /* we're brought up, everything changes */ 338 hw_reconf_flags = ~0; 339 ieee80211_led_radio(local, true); 340 ieee80211_mod_tpt_led_trig(local, 341 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 342 } 343 344 /* 345 * Copy the hopefully now-present MAC address to 346 * this interface, if it has the special null one. 347 */ 348 if (is_zero_ether_addr(dev->dev_addr)) { 349 memcpy(dev->dev_addr, 350 local->hw.wiphy->perm_addr, 351 ETH_ALEN); 352 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN); 353 354 if (!is_valid_ether_addr(dev->dev_addr)) { 355 res = -EADDRNOTAVAIL; 356 goto err_stop; 357 } 358 } 359 360 switch (sdata->vif.type) { 361 case NL80211_IFTYPE_AP_VLAN: 362 /* no need to tell driver, but set carrier */ 363 if (rtnl_dereference(sdata->bss->beacon)) 364 netif_carrier_on(dev); 365 else 366 netif_carrier_off(dev); 367 break; 368 case NL80211_IFTYPE_MONITOR: 369 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 370 local->cooked_mntrs++; 371 break; 372 } 373 374 if (local->monitors == 0 && local->open_count == 0) { 375 res = ieee80211_add_virtual_monitor(local); 376 if (res) 377 goto err_stop; 378 } 379 380 /* must be before the call to ieee80211_configure_filter */ 381 local->monitors++; 382 if (local->monitors == 1) { 383 local->hw.conf.flags |= IEEE80211_CONF_MONITOR; 384 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 385 } 386 387 ieee80211_adjust_monitor_flags(sdata, 1); 388 ieee80211_configure_filter(local); 389 390 netif_carrier_on(dev); 391 break; 392 default: 393 if (coming_up) { 394 ieee80211_del_virtual_monitor(local); 395 396 res = drv_add_interface(local, sdata); 397 if (res) 398 goto err_stop; 399 res = ieee80211_check_queues(sdata); 400 if (res) 401 goto err_del_interface; 402 } 403 404 if (sdata->vif.type == NL80211_IFTYPE_AP) { 405 local->fif_pspoll++; 406 local->fif_probe_req++; 407 408 ieee80211_configure_filter(local); 409 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 410 local->fif_probe_req++; 411 } 412 413 changed |= ieee80211_reset_erp_info(sdata); 414 ieee80211_bss_info_change_notify(sdata, changed); 415 416 if (sdata->vif.type == NL80211_IFTYPE_STATION || 417 sdata->vif.type == NL80211_IFTYPE_ADHOC || 418 sdata->vif.type == NL80211_IFTYPE_AP) 419 netif_carrier_off(dev); 420 else 421 netif_carrier_on(dev); 422 423 /* 424 * set default queue parameters so drivers don't 425 * need to initialise the hardware if the hardware 426 * doesn't start up with sane defaults 427 */ 428 ieee80211_set_wmm_default(sdata, true); 429 } 430 431 set_bit(SDATA_STATE_RUNNING, &sdata->state); 432 433 if (sdata->vif.type == NL80211_IFTYPE_WDS) { 434 /* Create STA entry for the WDS peer */ 435 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr, 436 GFP_KERNEL); 437 if (!sta) { 438 res = -ENOMEM; 439 goto err_del_interface; 440 } 441 442 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 443 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 444 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 445 446 res = sta_info_insert(sta); 447 if (res) { 448 /* STA has been freed */ 449 goto err_del_interface; 450 } 451 452 rate_control_rate_init(sta); 453 } 454 455 /* 456 * set_multicast_list will be invoked by the networking core 457 * which will check whether any increments here were done in 458 * error and sync them down to the hardware as filter flags. 459 */ 460 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 461 atomic_inc(&local->iff_allmultis); 462 463 if (sdata->flags & IEEE80211_SDATA_PROMISC) 464 atomic_inc(&local->iff_promiscs); 465 466 mutex_lock(&local->mtx); 467 hw_reconf_flags |= __ieee80211_recalc_idle(local); 468 mutex_unlock(&local->mtx); 469 470 if (coming_up) 471 local->open_count++; 472 473 if (hw_reconf_flags) 474 ieee80211_hw_config(local, hw_reconf_flags); 475 476 ieee80211_recalc_ps(local, -1); 477 478 netif_tx_start_all_queues(dev); 479 480 return 0; 481 err_del_interface: 482 drv_remove_interface(local, sdata); 483 err_stop: 484 if (!local->open_count) 485 drv_stop(local); 486 err_del_bss: 487 sdata->bss = NULL; 488 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 489 list_del(&sdata->u.vlan.list); 490 /* might already be clear but that doesn't matter */ 491 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 492 return res; 493 } 494 495 static int ieee80211_open(struct net_device *dev) 496 { 497 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 498 int err; 499 500 /* fail early if user set an invalid address */ 501 if (!is_valid_ether_addr(dev->dev_addr)) 502 return -EADDRNOTAVAIL; 503 504 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type); 505 if (err) 506 return err; 507 508 return ieee80211_do_open(dev, true); 509 } 510 511 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 512 bool going_down) 513 { 514 struct ieee80211_local *local = sdata->local; 515 unsigned long flags; 516 struct sk_buff *skb, *tmp; 517 u32 hw_reconf_flags = 0; 518 int i; 519 enum nl80211_channel_type orig_ct; 520 521 clear_bit(SDATA_STATE_RUNNING, &sdata->state); 522 523 if (local->scan_sdata == sdata) 524 ieee80211_scan_cancel(local); 525 526 /* 527 * Stop TX on this interface first. 528 */ 529 netif_tx_stop_all_queues(sdata->dev); 530 531 /* 532 * Purge work for this interface. 533 */ 534 ieee80211_work_purge(sdata); 535 536 /* 537 * Remove all stations associated with this interface. 538 * 539 * This must be done before calling ops->remove_interface() 540 * because otherwise we can later invoke ops->sta_notify() 541 * whenever the STAs are removed, and that invalidates driver 542 * assumptions about always getting a vif pointer that is valid 543 * (because if we remove a STA after ops->remove_interface() 544 * the driver will have removed the vif info already!) 545 * 546 * This is relevant only in AP, WDS and mesh modes, since in 547 * all other modes we've already removed all stations when 548 * disconnecting etc. 549 */ 550 sta_info_flush(local, sdata); 551 552 /* 553 * Don't count this interface for promisc/allmulti while it 554 * is down. dev_mc_unsync() will invoke set_multicast_list 555 * on the master interface which will sync these down to the 556 * hardware as filter flags. 557 */ 558 if (sdata->flags & IEEE80211_SDATA_ALLMULTI) 559 atomic_dec(&local->iff_allmultis); 560 561 if (sdata->flags & IEEE80211_SDATA_PROMISC) 562 atomic_dec(&local->iff_promiscs); 563 564 if (sdata->vif.type == NL80211_IFTYPE_AP) { 565 local->fif_pspoll--; 566 local->fif_probe_req--; 567 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 568 local->fif_probe_req--; 569 } 570 571 netif_addr_lock_bh(sdata->dev); 572 spin_lock_bh(&local->filter_lock); 573 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc, 574 sdata->dev->addr_len); 575 spin_unlock_bh(&local->filter_lock); 576 netif_addr_unlock_bh(sdata->dev); 577 578 ieee80211_configure_filter(local); 579 580 del_timer_sync(&local->dynamic_ps_timer); 581 cancel_work_sync(&local->dynamic_ps_enable_work); 582 583 /* APs need special treatment */ 584 if (sdata->vif.type == NL80211_IFTYPE_AP) { 585 struct ieee80211_sub_if_data *vlan, *tmpsdata; 586 struct beacon_data *old_beacon = 587 rtnl_dereference(sdata->u.ap.beacon); 588 struct sk_buff *old_probe_resp = 589 rtnl_dereference(sdata->u.ap.probe_resp); 590 591 /* sdata_running will return false, so this will disable */ 592 ieee80211_bss_info_change_notify(sdata, 593 BSS_CHANGED_BEACON_ENABLED); 594 595 /* remove beacon and probe response */ 596 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL); 597 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL); 598 synchronize_rcu(); 599 kfree(old_beacon); 600 kfree_skb(old_probe_resp); 601 602 /* down all dependent devices, that is VLANs */ 603 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans, 604 u.vlan.list) 605 dev_close(vlan->dev); 606 WARN_ON(!list_empty(&sdata->u.ap.vlans)); 607 608 /* free all potentially still buffered bcast frames */ 609 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf); 610 skb_queue_purge(&sdata->u.ap.ps_bc_buf); 611 } else if (sdata->vif.type == NL80211_IFTYPE_STATION) { 612 ieee80211_mgd_stop(sdata); 613 } 614 615 if (going_down) 616 local->open_count--; 617 618 switch (sdata->vif.type) { 619 case NL80211_IFTYPE_AP_VLAN: 620 list_del(&sdata->u.vlan.list); 621 /* no need to tell driver */ 622 break; 623 case NL80211_IFTYPE_MONITOR: 624 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { 625 local->cooked_mntrs--; 626 break; 627 } 628 629 local->monitors--; 630 if (local->monitors == 0) { 631 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR; 632 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; 633 ieee80211_del_virtual_monitor(local); 634 } 635 636 ieee80211_adjust_monitor_flags(sdata, -1); 637 ieee80211_configure_filter(local); 638 break; 639 default: 640 flush_work(&sdata->work); 641 /* 642 * When we get here, the interface is marked down. 643 * Call synchronize_rcu() to wait for the RX path 644 * should it be using the interface and enqueuing 645 * frames at this very time on another CPU. 646 */ 647 synchronize_rcu(); 648 skb_queue_purge(&sdata->skb_queue); 649 650 /* 651 * Disable beaconing here for mesh only, AP and IBSS 652 * are already taken care of. 653 */ 654 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 655 ieee80211_bss_info_change_notify(sdata, 656 BSS_CHANGED_BEACON_ENABLED); 657 658 /* 659 * Free all remaining keys, there shouldn't be any, 660 * except maybe group keys in AP more or WDS? 661 */ 662 ieee80211_free_keys(sdata); 663 664 if (going_down) 665 drv_remove_interface(local, sdata); 666 } 667 668 sdata->bss = NULL; 669 670 mutex_lock(&local->mtx); 671 hw_reconf_flags |= __ieee80211_recalc_idle(local); 672 mutex_unlock(&local->mtx); 673 674 ieee80211_recalc_ps(local, -1); 675 676 if (local->open_count == 0) { 677 if (local->ops->napi_poll) 678 napi_disable(&local->napi); 679 ieee80211_clear_tx_pending(local); 680 ieee80211_stop_device(local); 681 682 /* no reconfiguring after stop! */ 683 hw_reconf_flags = 0; 684 } 685 686 /* Re-calculate channel-type, in case there are multiple vifs 687 * on different channel types. 688 */ 689 orig_ct = local->_oper_channel_type; 690 ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT); 691 692 /* do after stop to avoid reconfiguring when we stop anyway */ 693 if (hw_reconf_flags || (orig_ct != local->_oper_channel_type)) 694 ieee80211_hw_config(local, hw_reconf_flags); 695 696 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 697 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { 698 skb_queue_walk_safe(&local->pending[i], skb, tmp) { 699 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 700 if (info->control.vif == &sdata->vif) { 701 __skb_unlink(skb, &local->pending[i]); 702 dev_kfree_skb_irq(skb); 703 } 704 } 705 } 706 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 707 708 if (local->monitors == local->open_count && local->monitors > 0) 709 ieee80211_add_virtual_monitor(local); 710 } 711 712 static int ieee80211_stop(struct net_device *dev) 713 { 714 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 715 716 ieee80211_do_stop(sdata, true); 717 718 return 0; 719 } 720 721 static void ieee80211_set_multicast_list(struct net_device *dev) 722 { 723 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 724 struct ieee80211_local *local = sdata->local; 725 int allmulti, promisc, sdata_allmulti, sdata_promisc; 726 727 allmulti = !!(dev->flags & IFF_ALLMULTI); 728 promisc = !!(dev->flags & IFF_PROMISC); 729 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); 730 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); 731 732 if (allmulti != sdata_allmulti) { 733 if (dev->flags & IFF_ALLMULTI) 734 atomic_inc(&local->iff_allmultis); 735 else 736 atomic_dec(&local->iff_allmultis); 737 sdata->flags ^= IEEE80211_SDATA_ALLMULTI; 738 } 739 740 if (promisc != sdata_promisc) { 741 if (dev->flags & IFF_PROMISC) 742 atomic_inc(&local->iff_promiscs); 743 else 744 atomic_dec(&local->iff_promiscs); 745 sdata->flags ^= IEEE80211_SDATA_PROMISC; 746 } 747 spin_lock_bh(&local->filter_lock); 748 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); 749 spin_unlock_bh(&local->filter_lock); 750 ieee80211_queue_work(&local->hw, &local->reconfig_filter); 751 } 752 753 /* 754 * Called when the netdev is removed or, by the code below, before 755 * the interface type changes. 756 */ 757 static void ieee80211_teardown_sdata(struct net_device *dev) 758 { 759 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 760 struct ieee80211_local *local = sdata->local; 761 int flushed; 762 int i; 763 764 /* free extra data */ 765 ieee80211_free_keys(sdata); 766 767 ieee80211_debugfs_remove_netdev(sdata); 768 769 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 770 __skb_queue_purge(&sdata->fragments[i].skb_list); 771 sdata->fragment_next = 0; 772 773 if (ieee80211_vif_is_mesh(&sdata->vif)) 774 mesh_rmc_free(sdata); 775 776 flushed = sta_info_flush(local, sdata); 777 WARN_ON(flushed); 778 } 779 780 static u16 ieee80211_netdev_select_queue(struct net_device *dev, 781 struct sk_buff *skb) 782 { 783 return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); 784 } 785 786 static const struct net_device_ops ieee80211_dataif_ops = { 787 .ndo_open = ieee80211_open, 788 .ndo_stop = ieee80211_stop, 789 .ndo_uninit = ieee80211_teardown_sdata, 790 .ndo_start_xmit = ieee80211_subif_start_xmit, 791 .ndo_set_rx_mode = ieee80211_set_multicast_list, 792 .ndo_change_mtu = ieee80211_change_mtu, 793 .ndo_set_mac_address = ieee80211_change_mac, 794 .ndo_select_queue = ieee80211_netdev_select_queue, 795 }; 796 797 static u16 ieee80211_monitor_select_queue(struct net_device *dev, 798 struct sk_buff *skb) 799 { 800 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 801 struct ieee80211_local *local = sdata->local; 802 struct ieee80211_hdr *hdr; 803 struct ieee80211_radiotap_header *rtap = (void *)skb->data; 804 805 if (local->hw.queues < IEEE80211_NUM_ACS) 806 return 0; 807 808 if (skb->len < 4 || 809 skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) 810 return 0; /* doesn't matter, frame will be dropped */ 811 812 hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); 813 814 return ieee80211_select_queue_80211(local, skb, hdr); 815 } 816 817 static const struct net_device_ops ieee80211_monitorif_ops = { 818 .ndo_open = ieee80211_open, 819 .ndo_stop = ieee80211_stop, 820 .ndo_uninit = ieee80211_teardown_sdata, 821 .ndo_start_xmit = ieee80211_monitor_start_xmit, 822 .ndo_set_rx_mode = ieee80211_set_multicast_list, 823 .ndo_change_mtu = ieee80211_change_mtu, 824 .ndo_set_mac_address = eth_mac_addr, 825 .ndo_select_queue = ieee80211_monitor_select_queue, 826 }; 827 828 static void ieee80211_if_setup(struct net_device *dev) 829 { 830 ether_setup(dev); 831 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 832 dev->netdev_ops = &ieee80211_dataif_ops; 833 dev->destructor = free_netdev; 834 } 835 836 static void ieee80211_iface_work(struct work_struct *work) 837 { 838 struct ieee80211_sub_if_data *sdata = 839 container_of(work, struct ieee80211_sub_if_data, work); 840 struct ieee80211_local *local = sdata->local; 841 struct sk_buff *skb; 842 struct sta_info *sta; 843 struct ieee80211_ra_tid *ra_tid; 844 845 if (!ieee80211_sdata_running(sdata)) 846 return; 847 848 if (local->scanning) 849 return; 850 851 /* 852 * ieee80211_queue_work() should have picked up most cases, 853 * here we'll pick the rest. 854 */ 855 if (WARN(local->suspended, 856 "interface work scheduled while going to suspend\n")) 857 return; 858 859 /* first process frames */ 860 while ((skb = skb_dequeue(&sdata->skb_queue))) { 861 struct ieee80211_mgmt *mgmt = (void *)skb->data; 862 863 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) { 864 ra_tid = (void *)&skb->cb; 865 ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra, 866 ra_tid->tid); 867 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) { 868 ra_tid = (void *)&skb->cb; 869 ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, 870 ra_tid->tid); 871 } else if (ieee80211_is_action(mgmt->frame_control) && 872 mgmt->u.action.category == WLAN_CATEGORY_BACK) { 873 int len = skb->len; 874 875 mutex_lock(&local->sta_mtx); 876 sta = sta_info_get_bss(sdata, mgmt->sa); 877 if (sta) { 878 switch (mgmt->u.action.u.addba_req.action_code) { 879 case WLAN_ACTION_ADDBA_REQ: 880 ieee80211_process_addba_request( 881 local, sta, mgmt, len); 882 break; 883 case WLAN_ACTION_ADDBA_RESP: 884 ieee80211_process_addba_resp(local, sta, 885 mgmt, len); 886 break; 887 case WLAN_ACTION_DELBA: 888 ieee80211_process_delba(sdata, sta, 889 mgmt, len); 890 break; 891 default: 892 WARN_ON(1); 893 break; 894 } 895 } 896 mutex_unlock(&local->sta_mtx); 897 } else if (ieee80211_is_data_qos(mgmt->frame_control)) { 898 struct ieee80211_hdr *hdr = (void *)mgmt; 899 /* 900 * So the frame isn't mgmt, but frame_control 901 * is at the right place anyway, of course, so 902 * the if statement is correct. 903 * 904 * Warn if we have other data frame types here, 905 * they must not get here. 906 */ 907 WARN_ON(hdr->frame_control & 908 cpu_to_le16(IEEE80211_STYPE_NULLFUNC)); 909 WARN_ON(!(hdr->seq_ctrl & 910 cpu_to_le16(IEEE80211_SCTL_FRAG))); 911 /* 912 * This was a fragment of a frame, received while 913 * a block-ack session was active. That cannot be 914 * right, so terminate the session. 915 */ 916 mutex_lock(&local->sta_mtx); 917 sta = sta_info_get_bss(sdata, mgmt->sa); 918 if (sta) { 919 u16 tid = *ieee80211_get_qos_ctl(hdr) & 920 IEEE80211_QOS_CTL_TID_MASK; 921 922 __ieee80211_stop_rx_ba_session( 923 sta, tid, WLAN_BACK_RECIPIENT, 924 WLAN_REASON_QSTA_REQUIRE_SETUP, 925 true); 926 } 927 mutex_unlock(&local->sta_mtx); 928 } else switch (sdata->vif.type) { 929 case NL80211_IFTYPE_STATION: 930 ieee80211_sta_rx_queued_mgmt(sdata, skb); 931 break; 932 case NL80211_IFTYPE_ADHOC: 933 ieee80211_ibss_rx_queued_mgmt(sdata, skb); 934 break; 935 case NL80211_IFTYPE_MESH_POINT: 936 if (!ieee80211_vif_is_mesh(&sdata->vif)) 937 break; 938 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 939 break; 940 default: 941 WARN(1, "frame for unexpected interface type"); 942 break; 943 } 944 945 kfree_skb(skb); 946 } 947 948 /* then other type-dependent work */ 949 switch (sdata->vif.type) { 950 case NL80211_IFTYPE_STATION: 951 ieee80211_sta_work(sdata); 952 break; 953 case NL80211_IFTYPE_ADHOC: 954 ieee80211_ibss_work(sdata); 955 break; 956 case NL80211_IFTYPE_MESH_POINT: 957 if (!ieee80211_vif_is_mesh(&sdata->vif)) 958 break; 959 ieee80211_mesh_work(sdata); 960 break; 961 default: 962 break; 963 } 964 } 965 966 967 /* 968 * Helper function to initialise an interface to a specific type. 969 */ 970 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, 971 enum nl80211_iftype type) 972 { 973 /* clear type-dependent union */ 974 memset(&sdata->u, 0, sizeof(sdata->u)); 975 976 /* and set some type-dependent values */ 977 sdata->vif.type = type; 978 sdata->vif.p2p = false; 979 sdata->dev->netdev_ops = &ieee80211_dataif_ops; 980 sdata->wdev.iftype = type; 981 982 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE); 983 sdata->control_port_no_encrypt = false; 984 985 sdata->noack_map = 0; 986 987 /* only monitor differs */ 988 sdata->dev->type = ARPHRD_ETHER; 989 990 skb_queue_head_init(&sdata->skb_queue); 991 INIT_WORK(&sdata->work, ieee80211_iface_work); 992 993 switch (type) { 994 case NL80211_IFTYPE_P2P_GO: 995 type = NL80211_IFTYPE_AP; 996 sdata->vif.type = type; 997 sdata->vif.p2p = true; 998 /* fall through */ 999 case NL80211_IFTYPE_AP: 1000 skb_queue_head_init(&sdata->u.ap.ps_bc_buf); 1001 INIT_LIST_HEAD(&sdata->u.ap.vlans); 1002 break; 1003 case NL80211_IFTYPE_P2P_CLIENT: 1004 type = NL80211_IFTYPE_STATION; 1005 sdata->vif.type = type; 1006 sdata->vif.p2p = true; 1007 /* fall through */ 1008 case NL80211_IFTYPE_STATION: 1009 ieee80211_sta_setup_sdata(sdata); 1010 break; 1011 case NL80211_IFTYPE_ADHOC: 1012 ieee80211_ibss_setup_sdata(sdata); 1013 break; 1014 case NL80211_IFTYPE_MESH_POINT: 1015 if (ieee80211_vif_is_mesh(&sdata->vif)) 1016 ieee80211_mesh_init_sdata(sdata); 1017 break; 1018 case NL80211_IFTYPE_MONITOR: 1019 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; 1020 sdata->dev->netdev_ops = &ieee80211_monitorif_ops; 1021 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | 1022 MONITOR_FLAG_OTHER_BSS; 1023 break; 1024 case NL80211_IFTYPE_WDS: 1025 case NL80211_IFTYPE_AP_VLAN: 1026 break; 1027 case NL80211_IFTYPE_UNSPECIFIED: 1028 case NUM_NL80211_IFTYPES: 1029 BUG(); 1030 break; 1031 } 1032 1033 ieee80211_debugfs_add_netdev(sdata); 1034 } 1035 1036 static void ieee80211_clean_sdata(struct ieee80211_sub_if_data *sdata) 1037 { 1038 switch (sdata->vif.type) { 1039 case NL80211_IFTYPE_MESH_POINT: 1040 mesh_path_flush_by_iface(sdata); 1041 break; 1042 1043 default: 1044 break; 1045 } 1046 } 1047 1048 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata, 1049 enum nl80211_iftype type) 1050 { 1051 struct ieee80211_local *local = sdata->local; 1052 int ret, err; 1053 enum nl80211_iftype internal_type = type; 1054 bool p2p = false; 1055 1056 ASSERT_RTNL(); 1057 1058 if (!local->ops->change_interface) 1059 return -EBUSY; 1060 1061 switch (sdata->vif.type) { 1062 case NL80211_IFTYPE_AP: 1063 case NL80211_IFTYPE_STATION: 1064 case NL80211_IFTYPE_ADHOC: 1065 /* 1066 * Could maybe also all others here? 1067 * Just not sure how that interacts 1068 * with the RX/config path e.g. for 1069 * mesh. 1070 */ 1071 break; 1072 default: 1073 return -EBUSY; 1074 } 1075 1076 switch (type) { 1077 case NL80211_IFTYPE_AP: 1078 case NL80211_IFTYPE_STATION: 1079 case NL80211_IFTYPE_ADHOC: 1080 /* 1081 * Could probably support everything 1082 * but WDS here (WDS do_open can fail 1083 * under memory pressure, which this 1084 * code isn't prepared to handle). 1085 */ 1086 break; 1087 case NL80211_IFTYPE_P2P_CLIENT: 1088 p2p = true; 1089 internal_type = NL80211_IFTYPE_STATION; 1090 break; 1091 case NL80211_IFTYPE_P2P_GO: 1092 p2p = true; 1093 internal_type = NL80211_IFTYPE_AP; 1094 break; 1095 default: 1096 return -EBUSY; 1097 } 1098 1099 ret = ieee80211_check_concurrent_iface(sdata, internal_type); 1100 if (ret) 1101 return ret; 1102 1103 ieee80211_do_stop(sdata, false); 1104 1105 ieee80211_teardown_sdata(sdata->dev); 1106 1107 ret = drv_change_interface(local, sdata, internal_type, p2p); 1108 if (ret) 1109 type = sdata->vif.type; 1110 1111 /* 1112 * Ignore return value here, there's not much we can do since 1113 * the driver changed the interface type internally already. 1114 * The warnings will hopefully make driver authors fix it :-) 1115 */ 1116 ieee80211_check_queues(sdata); 1117 1118 ieee80211_setup_sdata(sdata, type); 1119 1120 err = ieee80211_do_open(sdata->dev, false); 1121 WARN(err, "type change: do_open returned %d", err); 1122 1123 return ret; 1124 } 1125 1126 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, 1127 enum nl80211_iftype type) 1128 { 1129 int ret; 1130 1131 ASSERT_RTNL(); 1132 1133 if (type == ieee80211_vif_type_p2p(&sdata->vif)) 1134 return 0; 1135 1136 /* Setting ad-hoc mode on non-IBSS channel is not supported. */ 1137 if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS && 1138 type == NL80211_IFTYPE_ADHOC) 1139 return -EOPNOTSUPP; 1140 1141 if (ieee80211_sdata_running(sdata)) { 1142 ret = ieee80211_runtime_change_iftype(sdata, type); 1143 if (ret) 1144 return ret; 1145 } else { 1146 /* Purge and reset type-dependent state. */ 1147 ieee80211_teardown_sdata(sdata->dev); 1148 ieee80211_setup_sdata(sdata, type); 1149 } 1150 1151 /* reset some values that shouldn't be kept across type changes */ 1152 sdata->vif.bss_conf.basic_rates = 1153 ieee80211_mandatory_rates(sdata->local, 1154 sdata->local->hw.conf.channel->band); 1155 sdata->drop_unencrypted = 0; 1156 if (type == NL80211_IFTYPE_STATION) 1157 sdata->u.mgd.use_4addr = false; 1158 1159 return 0; 1160 } 1161 1162 static void ieee80211_assign_perm_addr(struct ieee80211_local *local, 1163 struct net_device *dev, 1164 enum nl80211_iftype type) 1165 { 1166 struct ieee80211_sub_if_data *sdata; 1167 u64 mask, start, addr, val, inc; 1168 u8 *m; 1169 u8 tmp_addr[ETH_ALEN]; 1170 int i; 1171 1172 /* default ... something at least */ 1173 memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); 1174 1175 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && 1176 local->hw.wiphy->n_addresses <= 1) 1177 return; 1178 1179 1180 mutex_lock(&local->iflist_mtx); 1181 1182 switch (type) { 1183 case NL80211_IFTYPE_MONITOR: 1184 /* doesn't matter */ 1185 break; 1186 case NL80211_IFTYPE_WDS: 1187 case NL80211_IFTYPE_AP_VLAN: 1188 /* match up with an AP interface */ 1189 list_for_each_entry(sdata, &local->interfaces, list) { 1190 if (sdata->vif.type != NL80211_IFTYPE_AP) 1191 continue; 1192 memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN); 1193 break; 1194 } 1195 /* keep default if no AP interface present */ 1196 break; 1197 default: 1198 /* assign a new address if possible -- try n_addresses first */ 1199 for (i = 0; i < local->hw.wiphy->n_addresses; i++) { 1200 bool used = false; 1201 1202 list_for_each_entry(sdata, &local->interfaces, list) { 1203 if (memcmp(local->hw.wiphy->addresses[i].addr, 1204 sdata->vif.addr, ETH_ALEN) == 0) { 1205 used = true; 1206 break; 1207 } 1208 } 1209 1210 if (!used) { 1211 memcpy(dev->perm_addr, 1212 local->hw.wiphy->addresses[i].addr, 1213 ETH_ALEN); 1214 break; 1215 } 1216 } 1217 1218 /* try mask if available */ 1219 if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) 1220 break; 1221 1222 m = local->hw.wiphy->addr_mask; 1223 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1224 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1225 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1226 1227 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { 1228 /* not a contiguous mask ... not handled now! */ 1229 printk(KERN_DEBUG "not contiguous\n"); 1230 break; 1231 } 1232 1233 m = local->hw.wiphy->perm_addr; 1234 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | 1235 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | 1236 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); 1237 1238 inc = 1ULL<<__ffs64(mask); 1239 val = (start & mask); 1240 addr = (start & ~mask) | (val & mask); 1241 do { 1242 bool used = false; 1243 1244 tmp_addr[5] = addr >> 0*8; 1245 tmp_addr[4] = addr >> 1*8; 1246 tmp_addr[3] = addr >> 2*8; 1247 tmp_addr[2] = addr >> 3*8; 1248 tmp_addr[1] = addr >> 4*8; 1249 tmp_addr[0] = addr >> 5*8; 1250 1251 val += inc; 1252 1253 list_for_each_entry(sdata, &local->interfaces, list) { 1254 if (memcmp(tmp_addr, sdata->vif.addr, 1255 ETH_ALEN) == 0) { 1256 used = true; 1257 break; 1258 } 1259 } 1260 1261 if (!used) { 1262 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN); 1263 break; 1264 } 1265 addr = (start & ~mask) | (val & mask); 1266 } while (addr != start); 1267 1268 break; 1269 } 1270 1271 mutex_unlock(&local->iflist_mtx); 1272 } 1273 1274 int ieee80211_if_add(struct ieee80211_local *local, const char *name, 1275 struct net_device **new_dev, enum nl80211_iftype type, 1276 struct vif_params *params) 1277 { 1278 struct net_device *ndev; 1279 struct ieee80211_sub_if_data *sdata = NULL; 1280 int ret, i; 1281 int txqs = 1; 1282 1283 ASSERT_RTNL(); 1284 1285 if (local->hw.queues >= IEEE80211_NUM_ACS) 1286 txqs = IEEE80211_NUM_ACS; 1287 1288 ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size, 1289 name, ieee80211_if_setup, txqs, 1); 1290 if (!ndev) 1291 return -ENOMEM; 1292 dev_net_set(ndev, wiphy_net(local->hw.wiphy)); 1293 1294 ndev->needed_headroom = local->tx_headroom + 1295 4*6 /* four MAC addresses */ 1296 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ 1297 + 6 /* mesh */ 1298 + 8 /* rfc1042/bridge tunnel */ 1299 - ETH_HLEN /* ethernet hard_header_len */ 1300 + IEEE80211_ENCRYPT_HEADROOM; 1301 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; 1302 1303 ret = dev_alloc_name(ndev, ndev->name); 1304 if (ret < 0) 1305 goto fail; 1306 1307 ieee80211_assign_perm_addr(local, ndev, type); 1308 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); 1309 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); 1310 1311 /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */ 1312 sdata = netdev_priv(ndev); 1313 ndev->ieee80211_ptr = &sdata->wdev; 1314 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); 1315 memcpy(sdata->name, ndev->name, IFNAMSIZ); 1316 1317 /* initialise type-independent data */ 1318 sdata->wdev.wiphy = local->hw.wiphy; 1319 sdata->local = local; 1320 sdata->dev = ndev; 1321 #ifdef CONFIG_INET 1322 sdata->arp_filter_state = true; 1323 #endif 1324 1325 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) 1326 skb_queue_head_init(&sdata->fragments[i].skb_list); 1327 1328 INIT_LIST_HEAD(&sdata->key_list); 1329 1330 for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 1331 struct ieee80211_supported_band *sband; 1332 sband = local->hw.wiphy->bands[i]; 1333 sdata->rc_rateidx_mask[i] = 1334 sband ? (1 << sband->n_bitrates) - 1 : 0; 1335 if (sband) 1336 memcpy(sdata->rc_rateidx_mcs_mask[i], 1337 sband->ht_cap.mcs.rx_mask, 1338 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1339 else 1340 memset(sdata->rc_rateidx_mcs_mask[i], 0, 1341 sizeof(sdata->rc_rateidx_mcs_mask[i])); 1342 } 1343 1344 ieee80211_set_default_queues(sdata); 1345 1346 /* setup type-dependent data */ 1347 ieee80211_setup_sdata(sdata, type); 1348 1349 if (params) { 1350 ndev->ieee80211_ptr->use_4addr = params->use_4addr; 1351 if (type == NL80211_IFTYPE_STATION) 1352 sdata->u.mgd.use_4addr = params->use_4addr; 1353 } 1354 1355 ret = register_netdevice(ndev); 1356 if (ret) 1357 goto fail; 1358 1359 mutex_lock(&local->iflist_mtx); 1360 list_add_tail_rcu(&sdata->list, &local->interfaces); 1361 mutex_unlock(&local->iflist_mtx); 1362 1363 if (new_dev) 1364 *new_dev = ndev; 1365 1366 return 0; 1367 1368 fail: 1369 free_netdev(ndev); 1370 return ret; 1371 } 1372 1373 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) 1374 { 1375 ASSERT_RTNL(); 1376 1377 mutex_lock(&sdata->local->iflist_mtx); 1378 list_del_rcu(&sdata->list); 1379 mutex_unlock(&sdata->local->iflist_mtx); 1380 1381 /* clean up type-dependent data */ 1382 ieee80211_clean_sdata(sdata); 1383 1384 synchronize_rcu(); 1385 unregister_netdevice(sdata->dev); 1386 } 1387 1388 /* 1389 * Remove all interfaces, may only be called at hardware unregistration 1390 * time because it doesn't do RCU-safe list removals. 1391 */ 1392 void ieee80211_remove_interfaces(struct ieee80211_local *local) 1393 { 1394 struct ieee80211_sub_if_data *sdata, *tmp; 1395 LIST_HEAD(unreg_list); 1396 1397 ASSERT_RTNL(); 1398 1399 mutex_lock(&local->iflist_mtx); 1400 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { 1401 list_del(&sdata->list); 1402 1403 ieee80211_clean_sdata(sdata); 1404 1405 unregister_netdevice_queue(sdata->dev, &unreg_list); 1406 } 1407 mutex_unlock(&local->iflist_mtx); 1408 unregister_netdevice_many(&unreg_list); 1409 list_del(&unreg_list); 1410 } 1411 1412 static u32 ieee80211_idle_off(struct ieee80211_local *local, 1413 const char *reason) 1414 { 1415 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) 1416 return 0; 1417 1418 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1419 wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason); 1420 #endif 1421 1422 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; 1423 return IEEE80211_CONF_CHANGE_IDLE; 1424 } 1425 1426 static u32 ieee80211_idle_on(struct ieee80211_local *local) 1427 { 1428 if (local->hw.conf.flags & IEEE80211_CONF_IDLE) 1429 return 0; 1430 1431 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1432 wiphy_debug(local->hw.wiphy, "device now idle\n"); 1433 #endif 1434 1435 drv_flush(local, false); 1436 1437 local->hw.conf.flags |= IEEE80211_CONF_IDLE; 1438 return IEEE80211_CONF_CHANGE_IDLE; 1439 } 1440 1441 u32 __ieee80211_recalc_idle(struct ieee80211_local *local) 1442 { 1443 struct ieee80211_sub_if_data *sdata; 1444 int count = 0; 1445 bool working = false, scanning = false, hw_roc = false; 1446 struct ieee80211_work *wk; 1447 unsigned int led_trig_start = 0, led_trig_stop = 0; 1448 1449 #ifdef CONFIG_PROVE_LOCKING 1450 WARN_ON(debug_locks && !lockdep_rtnl_is_held() && 1451 !lockdep_is_held(&local->iflist_mtx)); 1452 #endif 1453 lockdep_assert_held(&local->mtx); 1454 1455 list_for_each_entry(sdata, &local->interfaces, list) { 1456 if (!ieee80211_sdata_running(sdata)) { 1457 sdata->vif.bss_conf.idle = true; 1458 continue; 1459 } 1460 1461 sdata->old_idle = sdata->vif.bss_conf.idle; 1462 1463 /* do not count disabled managed interfaces */ 1464 if (sdata->vif.type == NL80211_IFTYPE_STATION && 1465 !sdata->u.mgd.associated && 1466 !sdata->u.mgd.auth_data && 1467 !sdata->u.mgd.assoc_data) { 1468 sdata->vif.bss_conf.idle = true; 1469 continue; 1470 } 1471 /* do not count unused IBSS interfaces */ 1472 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && 1473 !sdata->u.ibss.ssid_len) { 1474 sdata->vif.bss_conf.idle = true; 1475 continue; 1476 } 1477 /* count everything else */ 1478 sdata->vif.bss_conf.idle = false; 1479 count++; 1480 } 1481 1482 list_for_each_entry(wk, &local->work_list, list) { 1483 working = true; 1484 wk->sdata->vif.bss_conf.idle = false; 1485 } 1486 1487 if (local->scan_sdata && 1488 !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) { 1489 scanning = true; 1490 local->scan_sdata->vif.bss_conf.idle = false; 1491 } 1492 1493 if (local->hw_roc_channel) 1494 hw_roc = true; 1495 1496 list_for_each_entry(sdata, &local->interfaces, list) { 1497 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 1498 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1499 continue; 1500 if (sdata->old_idle == sdata->vif.bss_conf.idle) 1501 continue; 1502 if (!ieee80211_sdata_running(sdata)) 1503 continue; 1504 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE); 1505 } 1506 1507 if (working || scanning || hw_roc) 1508 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK; 1509 else 1510 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK; 1511 1512 if (count) 1513 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 1514 else 1515 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED; 1516 1517 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop); 1518 1519 if (hw_roc) 1520 return ieee80211_idle_off(local, "hw remain-on-channel"); 1521 if (working) 1522 return ieee80211_idle_off(local, "working"); 1523 if (scanning) 1524 return ieee80211_idle_off(local, "scanning"); 1525 if (!count) 1526 return ieee80211_idle_on(local); 1527 else 1528 return ieee80211_idle_off(local, "in use"); 1529 1530 return 0; 1531 } 1532 1533 void ieee80211_recalc_idle(struct ieee80211_local *local) 1534 { 1535 u32 chg; 1536 1537 mutex_lock(&local->iflist_mtx); 1538 chg = __ieee80211_recalc_idle(local); 1539 mutex_unlock(&local->iflist_mtx); 1540 if (chg) 1541 ieee80211_hw_config(local, chg); 1542 } 1543 1544 static int netdev_notify(struct notifier_block *nb, 1545 unsigned long state, 1546 void *ndev) 1547 { 1548 struct net_device *dev = ndev; 1549 struct ieee80211_sub_if_data *sdata; 1550 1551 if (state != NETDEV_CHANGENAME) 1552 return 0; 1553 1554 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) 1555 return 0; 1556 1557 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) 1558 return 0; 1559 1560 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1561 1562 memcpy(sdata->name, dev->name, IFNAMSIZ); 1563 1564 ieee80211_debugfs_rename_netdev(sdata); 1565 return 0; 1566 } 1567 1568 static struct notifier_block mac80211_netdev_notifier = { 1569 .notifier_call = netdev_notify, 1570 }; 1571 1572 int ieee80211_iface_init(void) 1573 { 1574 return register_netdevice_notifier(&mac80211_netdev_notifier); 1575 } 1576 1577 void ieee80211_iface_exit(void) 1578 { 1579 unregister_netdevice_notifier(&mac80211_netdev_notifier); 1580 } 1581