iface.c 24.9 KB
Newer Older
1
/*
2 3
 * Interface handling (except master interface)
 *
4 5 6
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7
 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8 9 10 11 12 13 14 15 16 17 18 19
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "sta_info.h"
20
#include "debugfs_netdev.h"
21
#include "mesh.h"
22 23
#include "led.h"

24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
/**
 * DOC: Interface list locking
 *
 * The interface list in each struct ieee80211_local is protected
 * three-fold:
 *
 * (1) modifications may only be done under the RTNL
 * (2) modifications and readers are protected against each other by
 *     the iflist_mtx.
 * (3) modifications are done in an RCU manner so atomic readers
 *     can traverse the list in RCU-safe blocks.
 *
 * As a consequence, reads (traversals) of the list can be protected
 * by either the RTNL, the iflist_mtx or RCU.
 */


41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77
static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
{
	int meshhdrlen;
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;

	/* FIX: what would be proper limits for MTU?
	 * This interface uses 802.3 frames. */
	if (new_mtu < 256 ||
	    new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
		return -EINVAL;
	}

#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
	printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
	dev->mtu = new_mtu;
	return 0;
}

static inline int identical_mac_addr_allowed(int type1, int type2)
{
	return type1 == NL80211_IFTYPE_MONITOR ||
		type2 == NL80211_IFTYPE_MONITOR ||
		(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
		(type1 == NL80211_IFTYPE_WDS &&
			(type2 == NL80211_IFTYPE_WDS ||
			 type2 == NL80211_IFTYPE_AP)) ||
		(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
		(type1 == NL80211_IFTYPE_AP_VLAN &&
			(type2 == NL80211_IFTYPE_AP ||
			 type2 == NL80211_IFTYPE_AP_VLAN));
}

static int ieee80211_open(struct net_device *dev)
{
78 79 80
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_sub_if_data *nsdata;
	struct ieee80211_local *local = sdata->local;
81 82 83 84
	struct sta_info *sta;
	struct ieee80211_if_init_conf conf;
	u32 changed = 0;
	int res;
85
	u32 hw_reconf_flags = 0;
86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171
	u8 null_addr[ETH_ALEN] = {0};

	/* fail early if user set an invalid address */
	if (compare_ether_addr(dev->dev_addr, null_addr) &&
	    !is_valid_ether_addr(dev->dev_addr))
		return -EADDRNOTAVAIL;

	/* we hold the RTNL here so can safely walk the list */
	list_for_each_entry(nsdata, &local->interfaces, list) {
		struct net_device *ndev = nsdata->dev;

		if (ndev != dev && netif_running(ndev)) {
			/*
			 * Allow only a single IBSS interface to be up at any
			 * time. This is restricted because beacon distribution
			 * cannot work properly if both are in the same IBSS.
			 *
			 * To remove this restriction we'd have to disallow them
			 * from setting the same SSID on different IBSS interfaces
			 * belonging to the same hardware. Then, however, we're
			 * faced with having to adopt two different TSF timers...
			 */
			if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
			    nsdata->vif.type == NL80211_IFTYPE_ADHOC)
				return -EBUSY;

			/*
			 * The remaining checks are only performed for interfaces
			 * with the same MAC address.
			 */
			if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
				continue;

			/*
			 * check whether it may have the same address
			 */
			if (!identical_mac_addr_allowed(sdata->vif.type,
							nsdata->vif.type))
				return -ENOTUNIQ;

			/*
			 * can only add VLANs to enabled APs
			 */
			if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
			    nsdata->vif.type == NL80211_IFTYPE_AP)
				sdata->bss = &nsdata->u.ap;
		}
	}

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_WDS:
		if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
			return -ENOLINK;
		break;
	case NL80211_IFTYPE_AP_VLAN:
		if (!sdata->bss)
			return -ENOLINK;
		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
		break;
	case NL80211_IFTYPE_AP:
		sdata->bss = &sdata->u.ap;
		break;
	case NL80211_IFTYPE_MESH_POINT:
		if (!ieee80211_vif_is_mesh(&sdata->vif))
			break;
		/* mesh ifaces must set allmulti to forward mcast traffic */
		atomic_inc(&local->iff_allmultis);
		break;
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_MONITOR:
	case NL80211_IFTYPE_ADHOC:
		/* no special treatment */
		break;
	case NL80211_IFTYPE_UNSPECIFIED:
	case __NL80211_IFTYPE_AFTER_LAST:
		/* cannot happen */
		WARN_ON(1);
		break;
	}

	if (local->open_count == 0) {
		res = 0;
		if (local->ops->start)
			res = local->ops->start(local_to_hw(local));
		if (res)
			goto err_del_bss;
172 173
		/* we're brought up, everything changes */
		hw_reconf_flags = ~0;
174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218
		ieee80211_led_radio(local, local->hw.conf.radio_enabled);
	}

	/*
	 * Check all interfaces and copy the hopefully now-present
	 * MAC address to those that have the special null one.
	 */
	list_for_each_entry(nsdata, &local->interfaces, list) {
		struct net_device *ndev = nsdata->dev;

		/*
		 * No need to check netif_running since we do not allow
		 * it to start up with this invalid address.
		 */
		if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
			memcpy(ndev->dev_addr,
			       local->hw.wiphy->perm_addr,
			       ETH_ALEN);
	}

	if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
		memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
		       ETH_ALEN);

	/*
	 * Validate the MAC address for this device.
	 */
	if (!is_valid_ether_addr(dev->dev_addr)) {
		if (!local->open_count && local->ops->stop)
			local->ops->stop(local_to_hw(local));
		return -EADDRNOTAVAIL;
	}

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_AP_VLAN:
		/* no need to tell driver */
		break;
	case NL80211_IFTYPE_MONITOR:
		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
			local->cooked_mntrs++;
			break;
		}

		/* must be before the call to ieee80211_configure_filter */
		local->monitors++;
219
		if (local->monitors == 1) {
220
			local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
221 222
			hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
		}
223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238

		if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
			local->fif_fcsfail++;
		if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
			local->fif_plcpfail++;
		if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
			local->fif_control++;
		if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
			local->fif_other_bss++;

		netif_addr_lock_bh(local->mdev);
		ieee80211_configure_filter(local);
		netif_addr_unlock_bh(local->mdev);
		break;
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_ADHOC:
239 240 241 242
		if (sdata->vif.type == NL80211_IFTYPE_STATION)
			sdata->u.mgd.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
		else
			sdata->u.ibss.flags &= ~IEEE80211_IBSS_PREV_BSSID_SET;
243 244 245 246 247 248 249 250 251
		/* fall through */
	default:
		conf.vif = &sdata->vif;
		conf.type = sdata->vif.type;
		conf.mac_addr = dev->dev_addr;
		res = local->ops->add_interface(local_to_hw(local), &conf);
		if (res)
			goto err_stop;

252 253 254 255 256 257
		if (ieee80211_vif_is_mesh(&sdata->vif)) {
			local->fif_other_bss++;
			netif_addr_lock_bh(local->mdev);
			ieee80211_configure_filter(local);
			netif_addr_unlock_bh(local->mdev);

258
			ieee80211_start_mesh(sdata);
259
		}
260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310
		changed |= ieee80211_reset_erp_info(sdata);
		ieee80211_bss_info_change_notify(sdata, changed);
		ieee80211_enable_keys(sdata);

		if (sdata->vif.type == NL80211_IFTYPE_STATION &&
		    !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
			netif_carrier_off(dev);
		else
			netif_carrier_on(dev);
	}

	if (sdata->vif.type == NL80211_IFTYPE_WDS) {
		/* Create STA entry for the WDS peer */
		sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
				     GFP_KERNEL);
		if (!sta) {
			res = -ENOMEM;
			goto err_del_interface;
		}

		/* no locking required since STA is not live yet */
		sta->flags |= WLAN_STA_AUTHORIZED;

		res = sta_info_insert(sta);
		if (res) {
			/* STA has been freed */
			goto err_del_interface;
		}
	}

	if (local->open_count == 0) {
		res = dev_open(local->mdev);
		WARN_ON(res);
		if (res)
			goto err_del_interface;
		tasklet_enable(&local->tx_pending_tasklet);
		tasklet_enable(&local->tasklet);
	}

	/*
	 * set_multicast_list will be invoked by the networking core
	 * which will check whether any increments here were done in
	 * error and sync them down to the hardware as filter flags.
	 */
	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
		atomic_inc(&local->iff_allmultis);

	if (sdata->flags & IEEE80211_SDATA_PROMISC)
		atomic_inc(&local->iff_promiscs);

	local->open_count++;
311 312
	if (hw_reconf_flags) {
		ieee80211_hw_config(local, hw_reconf_flags);
313 314 315 316 317 318 319 320 321 322 323 324 325 326
		/*
		 * set default queue parameters so drivers don't
		 * need to initialise the hardware if the hardware
		 * doesn't start up with sane defaults
		 */
		ieee80211_set_wmm_default(sdata);
	}

	/*
	 * ieee80211_sta_work is disabled while network interface
	 * is down. Therefore, some configuration changes may not
	 * yet be effective. Trigger execution of ieee80211_sta_work
	 * to fix this.
	 */
327 328 329 330
	if (sdata->vif.type == NL80211_IFTYPE_STATION)
		queue_work(local->hw.workqueue, &sdata->u.mgd.work);
	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
		queue_work(local->hw.workqueue, &sdata->u.ibss.work);
331

332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352
	netif_tx_start_all_queues(dev);

	return 0;
 err_del_interface:
	local->ops->remove_interface(local_to_hw(local), &conf);
 err_stop:
	if (!local->open_count && local->ops->stop)
		local->ops->stop(local_to_hw(local));
 err_del_bss:
	sdata->bss = NULL;
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
		list_del(&sdata->u.vlan.list);
	return res;
}

static int ieee80211_stop(struct net_device *dev)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_init_conf conf;
	struct sta_info *sta;
353
	u32 hw_reconf_flags = 0;
354 355 356 357 358 359 360 361 362 363 364 365 366

	/*
	 * Stop TX on this interface first.
	 */
	netif_tx_stop_all_queues(dev);

	/*
	 * Now delete all active aggregation sessions.
	 */
	rcu_read_lock();

	list_for_each_entry_rcu(sta, &local->sta_list, list) {
		if (sta->sdata == sdata)
367
			ieee80211_sta_tear_down_BA_sessions(sta);
368 369 370 371
	}

	rcu_read_unlock();

372 373 374 375 376 377 378 379 380 381 382 383
	/*
	 * Announce that we are leaving the network, in case we are a
	 * station interface type. This must be done before removing
	 * all stations associated with sta_info_flush, otherwise STA
	 * information will be gone and no announce being done.
	 */
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
		if (sdata->u.mgd.state != IEEE80211_STA_MLME_DISABLED)
			ieee80211_sta_deauthenticate(sdata,
				WLAN_REASON_DEAUTH_LEAVING);
	}

384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415
	/*
	 * Remove all stations associated with this interface.
	 *
	 * This must be done before calling ops->remove_interface()
	 * because otherwise we can later invoke ops->sta_notify()
	 * whenever the STAs are removed, and that invalidates driver
	 * assumptions about always getting a vif pointer that is valid
	 * (because if we remove a STA after ops->remove_interface()
	 * the driver will have removed the vif info already!)
	 *
	 * We could relax this and only unlink the stations from the
	 * hash table and list but keep them on a per-sdata list that
	 * will be inserted back again when the interface is brought
	 * up again, but I don't currently see a use case for that,
	 * except with WDS which gets a STA entry created when it is
	 * brought up.
	 */
	sta_info_flush(local, sdata);

	/*
	 * Don't count this interface for promisc/allmulti while it
	 * is down. dev_mc_unsync() will invoke set_multicast_list
	 * on the master interface which will sync these down to the
	 * hardware as filter flags.
	 */
	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
		atomic_dec(&local->iff_allmultis);

	if (sdata->flags & IEEE80211_SDATA_PROMISC)
		atomic_dec(&local->iff_promiscs);

	dev_mc_unsync(local->mdev, dev);
416 417
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);
418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449

	/* APs need special treatment */
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
		struct ieee80211_sub_if_data *vlan, *tmp;
		struct beacon_data *old_beacon = sdata->u.ap.beacon;

		/* remove beacon */
		rcu_assign_pointer(sdata->u.ap.beacon, NULL);
		synchronize_rcu();
		kfree(old_beacon);

		/* down all dependent devices, that is VLANs */
		list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
					 u.vlan.list)
			dev_close(vlan->dev);
		WARN_ON(!list_empty(&sdata->u.ap.vlans));
	}

	local->open_count--;

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_AP_VLAN:
		list_del(&sdata->u.vlan.list);
		/* no need to tell driver */
		break;
	case NL80211_IFTYPE_MONITOR:
		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
			local->cooked_mntrs--;
			break;
		}

		local->monitors--;
450
		if (local->monitors == 0) {
451
			local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
452 453
			hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
		}
454 455 456 457 458 459 460 461 462 463 464 465 466 467 468

		if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
			local->fif_fcsfail--;
		if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
			local->fif_plcpfail--;
		if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
			local->fif_control--;
		if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
			local->fif_other_bss--;

		netif_addr_lock_bh(local->mdev);
		ieee80211_configure_filter(local);
		netif_addr_unlock_bh(local->mdev);
		break;
	case NL80211_IFTYPE_STATION:
469 470 471
		memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
		del_timer_sync(&sdata->u.mgd.chswitch_timer);
		del_timer_sync(&sdata->u.mgd.timer);
472 473 474 475 476 477 478
		/*
		 * If the timer fired while we waited for it, it will have
		 * requeued the work. Now the work will be running again
		 * but will not rearm the timer again because it checks
		 * whether the interface is running, which, at this point,
		 * it no longer is.
		 */
479 480
		cancel_work_sync(&sdata->u.mgd.work);
		cancel_work_sync(&sdata->u.mgd.chswitch_work);
481 482 483 484 485 486 487
		/*
		 * When we get here, the interface is marked down.
		 * Call synchronize_rcu() to wait for the RX path
		 * should it be using the interface and enqueuing
		 * frames at this very time on another CPU.
		 */
		synchronize_rcu();
488
		skb_queue_purge(&sdata->u.mgd.skb_queue);
489

490
		sdata->u.mgd.flags &= ~(IEEE80211_STA_PRIVACY_INVOKED |
491
					IEEE80211_STA_TKIP_WEP_USED);
492 493 494 495 496 497 498 499 500 501 502 503
		kfree(sdata->u.mgd.extra_ie);
		sdata->u.mgd.extra_ie = NULL;
		sdata->u.mgd.extra_ie_len = 0;
		/* fall through */
	case NL80211_IFTYPE_ADHOC:
		if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
			memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
			del_timer_sync(&sdata->u.ibss.timer);
			cancel_work_sync(&sdata->u.ibss.work);
			synchronize_rcu();
			skb_queue_purge(&sdata->u.ibss.skb_queue);
		}
504 505 506
		/* fall through */
	case NL80211_IFTYPE_MESH_POINT:
		if (ieee80211_vif_is_mesh(&sdata->vif)) {
507 508 509
			/* other_bss and allmulti are always set on mesh
			 * ifaces */
			local->fif_other_bss--;
510
			atomic_dec(&local->iff_allmultis);
511 512 513 514 515

			netif_addr_lock_bh(local->mdev);
			ieee80211_configure_filter(local);
			netif_addr_unlock_bh(local->mdev);

516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541
			ieee80211_stop_mesh(sdata);
		}
		/* fall through */
	default:
		if (local->scan_sdata == sdata) {
			if (!local->ops->hw_scan)
				cancel_delayed_work_sync(&local->scan_work);
			/*
			 * The software scan can no longer run now, so we can
			 * clear out the scan_sdata reference. However, the
			 * hardware scan may still be running. The complete
			 * function must be prepared to handle a NULL value.
			 */
			local->scan_sdata = NULL;
			/*
			 * The memory barrier guarantees that another CPU
			 * that is hardware-scanning will now see the fact
			 * that this interface is gone.
			 */
			smp_mb();
			/*
			 * If software scanning, complete the scan but since
			 * the scan_sdata is NULL already don't send out a
			 * scan event to userspace -- the scan is incomplete.
			 */
			if (local->sw_scanning)
542
				ieee80211_scan_completed(&local->hw, true);
543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567
		}

		conf.vif = &sdata->vif;
		conf.type = sdata->vif.type;
		conf.mac_addr = dev->dev_addr;
		/* disable all keys for as long as this netdev is down */
		ieee80211_disable_keys(sdata);
		local->ops->remove_interface(local_to_hw(local), &conf);
	}

	sdata->bss = NULL;

	if (local->open_count == 0) {
		if (netif_running(local->mdev))
			dev_close(local->mdev);

		if (local->ops->stop)
			local->ops->stop(local_to_hw(local));

		ieee80211_led_radio(local, 0);

		flush_workqueue(local->hw.workqueue);

		tasklet_disable(&local->tx_pending_tasklet);
		tasklet_disable(&local->tasklet);
568 569 570

		/* no reconfiguring after stop! */
		hw_reconf_flags = 0;
571 572
	}

573 574 575 576
	/* do after stop to avoid reconfiguring when we stop anyway */
	if (hw_reconf_flags)
		ieee80211_hw_config(local, hw_reconf_flags);

577 578 579 580 581 582
	return 0;
}

static void ieee80211_set_multicast_list(struct net_device *dev)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
583
	struct ieee80211_local *local = sdata->local;
584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609
	int allmulti, promisc, sdata_allmulti, sdata_promisc;

	allmulti = !!(dev->flags & IFF_ALLMULTI);
	promisc = !!(dev->flags & IFF_PROMISC);
	sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
	sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);

	if (allmulti != sdata_allmulti) {
		if (dev->flags & IFF_ALLMULTI)
			atomic_inc(&local->iff_allmultis);
		else
			atomic_dec(&local->iff_allmultis);
		sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
	}

	if (promisc != sdata_promisc) {
		if (dev->flags & IFF_PROMISC)
			atomic_inc(&local->iff_promiscs);
		else
			atomic_dec(&local->iff_promiscs);
		sdata->flags ^= IEEE80211_SDATA_PROMISC;
	}

	dev_mc_sync(local->mdev, dev);
}

610 611 612 613 614
/*
 * Called when the netdev is removed or, by the code below, before
 * the interface type changes.
 */
static void ieee80211_teardown_sdata(struct net_device *dev)
615
{
616 617 618 619 620
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
	struct beacon_data *beacon;
	struct sk_buff *skb;
	int flushed;
621 622
	int i;

623 624 625
	/* free extra data */
	ieee80211_free_keys(sdata);

626 627
	ieee80211_debugfs_remove_netdev(sdata);

628
	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
629 630
		__skb_queue_purge(&sdata->fragments[i].skb_list);
	sdata->fragment_next = 0;
631

632
	switch (sdata->vif.type) {
633
	case NL80211_IFTYPE_AP:
634 635 636 637
		beacon = sdata->u.ap.beacon;
		rcu_assign_pointer(sdata->u.ap.beacon, NULL);
		synchronize_rcu();
		kfree(beacon);
638

639 640 641 642 643 644
		while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
			local->total_ps_buffered--;
			dev_kfree_skb(skb);
		}

		break;
645
	case NL80211_IFTYPE_MESH_POINT:
646
		if (ieee80211_vif_is_mesh(&sdata->vif))
647
			mesh_rmc_free(sdata);
648
		break;
649
	case NL80211_IFTYPE_ADHOC:
650 651 652 653 654 655 656 657 658 659 660 661 662
		kfree_skb(sdata->u.ibss.probe_resp);
		break;
	case NL80211_IFTYPE_STATION:
		kfree(sdata->u.mgd.extra_ie);
		kfree(sdata->u.mgd.assocreq_ies);
		kfree(sdata->u.mgd.assocresp_ies);
		kfree(sdata->u.mgd.ie_probereq);
		kfree(sdata->u.mgd.ie_proberesp);
		kfree(sdata->u.mgd.ie_auth);
		kfree(sdata->u.mgd.ie_assocreq);
		kfree(sdata->u.mgd.ie_reassocreq);
		kfree(sdata->u.mgd.ie_deauth);
		kfree(sdata->u.mgd.ie_disassoc);
663
		kfree(sdata->u.mgd.sme_auth_ie);
664
		break;
665 666 667
	case NL80211_IFTYPE_WDS:
	case NL80211_IFTYPE_AP_VLAN:
	case NL80211_IFTYPE_MONITOR:
668
		break;
669 670
	case NL80211_IFTYPE_UNSPECIFIED:
	case __NL80211_IFTYPE_AFTER_LAST:
671 672 673 674 675 676
		BUG();
		break;
	}

	flushed = sta_info_flush(local, sdata);
	WARN_ON(flushed);
677 678
}

679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706
static const struct net_device_ops ieee80211_dataif_ops = {
	.ndo_open		= ieee80211_open,
	.ndo_stop		= ieee80211_stop,
	.ndo_uninit		= ieee80211_teardown_sdata,
	.ndo_start_xmit		= ieee80211_subif_start_xmit,
	.ndo_set_multicast_list = ieee80211_set_multicast_list,
	.ndo_change_mtu 	= ieee80211_change_mtu,
	.ndo_set_mac_address 	= eth_mac_addr,
};

static const struct net_device_ops ieee80211_monitorif_ops = {
	.ndo_open		= ieee80211_open,
	.ndo_stop		= ieee80211_stop,
	.ndo_uninit		= ieee80211_teardown_sdata,
	.ndo_start_xmit		= ieee80211_monitor_start_xmit,
	.ndo_set_multicast_list = ieee80211_set_multicast_list,
	.ndo_change_mtu 	= ieee80211_change_mtu,
	.ndo_set_mac_address 	= eth_mac_addr,
};

static void ieee80211_if_setup(struct net_device *dev)
{
	ether_setup(dev);
	dev->netdev_ops = &ieee80211_dataif_ops;
	dev->wireless_handlers = &ieee80211_iw_handler_def;
	dev->destructor = free_netdev;
}

707 708 709 710
/*
 * Helper function to initialise an interface to a specific type.
 */
static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
711
				  enum nl80211_iftype type)
712
{
713 714 715 716 717
	/* clear type-dependent union */
	memset(&sdata->u, 0, sizeof(sdata->u));

	/* and set some type-dependent values */
	sdata->vif.type = type;
718
	sdata->dev->netdev_ops = &ieee80211_dataif_ops;
Johannes Berg's avatar
Johannes Berg committed
719
	sdata->wdev.iftype = type;
720 721 722 723 724

	/* only monitor differs */
	sdata->dev->type = ARPHRD_ETHER;

	switch (type) {
725
	case NL80211_IFTYPE_AP:
726 727 728
		skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
		INIT_LIST_HEAD(&sdata->u.ap.vlans);
		break;
729
	case NL80211_IFTYPE_STATION:
730
		ieee80211_sta_setup_sdata(sdata);
731
		break;
732 733 734
	case NL80211_IFTYPE_ADHOC:
		ieee80211_ibss_setup_sdata(sdata);
		break;
735
	case NL80211_IFTYPE_MESH_POINT:
736 737 738
		if (ieee80211_vif_is_mesh(&sdata->vif))
			ieee80211_mesh_init_sdata(sdata);
		break;
739
	case NL80211_IFTYPE_MONITOR:
740
		sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
741
		sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
742 743 744
		sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
				      MONITOR_FLAG_OTHER_BSS;
		break;
745 746
	case NL80211_IFTYPE_WDS:
	case NL80211_IFTYPE_AP_VLAN:
747
		break;
748 749
	case NL80211_IFTYPE_UNSPECIFIED:
	case __NL80211_IFTYPE_AFTER_LAST:
750 751 752 753 754 755 756
		BUG();
		break;
	}

	ieee80211_debugfs_add_netdev(sdata);
}

757
int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
758
			     enum nl80211_iftype type)
759
{
760 761 762 763 764
	ASSERT_RTNL();

	if (type == sdata->vif.type)
		return 0;

765
	/* Setting ad-hoc mode on non-IBSS channel is not supported. */
766 767
	if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
	    type == NL80211_IFTYPE_ADHOC)
768 769
		return -EOPNOTSUPP;

770 771 772 773 774 775 776 777 778
	/*
	 * We could, here, on changes between IBSS/STA/MESH modes,
	 * invoke an MLME function instead that disassociates etc.
	 * and goes into the requested mode.
	 */

	if (netif_running(sdata->dev))
		return -EBUSY;

779 780 781 782 783
	/* Purge and reset type-dependent state. */
	ieee80211_teardown_sdata(sdata->dev);
	ieee80211_setup_sdata(sdata, type);

	/* reset some values that shouldn't be kept across type changes */
784
	sdata->vif.bss_conf.basic_rates =
785 786
		ieee80211_mandatory_rates(sdata->local,
			sdata->local->hw.conf.channel->band);
787
	sdata->drop_unencrypted = 0;
788 789

	return 0;
790 791
}

792
int ieee80211_if_add(struct ieee80211_local *local, const char *name,
793
		     struct net_device **new_dev, enum nl80211_iftype type,
794
		     struct vif_params *params)
795 796 797
{
	struct net_device *ndev;
	struct ieee80211_sub_if_data *sdata = NULL;
798
	int ret, i;
799 800

	ASSERT_RTNL();
801

802
	ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
803 804 805 806
			    name, ieee80211_if_setup);
	if (!ndev)
		return -ENOMEM;

807 808 809 810 811 812 813 814 815
	ndev->needed_headroom = local->tx_headroom +
				4*6 /* four MAC addresses */
				+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
				+ 6 /* mesh */
				+ 8 /* rfc1042/bridge tunnel */
				- ETH_HLEN /* ethernet hard_header_len */
				+ IEEE80211_ENCRYPT_HEADROOM;
	ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;

816 817 818 819 820 821
	ret = dev_alloc_name(ndev, ndev->name);
	if (ret < 0)
		goto fail;

	memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
	SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
822
	ndev->features |= NETIF_F_NETNS_LOCAL;
823

824 825
	/* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
	sdata = netdev_priv(ndev);
826
	ndev->ieee80211_ptr = &sdata->wdev;
827 828

	/* initialise type-independent data */
829 830
	sdata->wdev.wiphy = local->hw.wiphy;
	sdata->local = local;
831 832 833 834 835 836 837 838 839 840 841 842
	sdata->dev = ndev;

	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
		skb_queue_head_init(&sdata->fragments[i].skb_list);

	INIT_LIST_HEAD(&sdata->key_list);

	sdata->force_unicast_rateidx = -1;
	sdata->max_ratectrl_rateidx = -1;

	/* setup type-dependent data */
	ieee80211_setup_sdata(sdata, type);
843 844 845 846 847

	ret = register_netdevice(ndev);
	if (ret)
		goto fail;

Johannes Berg's avatar
Johannes Berg committed
848 849
	if (ieee80211_vif_is_mesh(&sdata->vif) &&
	    params && params->mesh_id_len)
850 851 852
		ieee80211_sdata_set_mesh_id(sdata,
					    params->mesh_id_len,
					    params->mesh_id);
853

854
	mutex_lock(&local->iflist_mtx);
855
	list_add_tail_rcu(&sdata->list, &local->interfaces);
856
	mutex_unlock(&local->iflist_mtx);
857

858 859 860 861 862
	if (new_dev)
		*new_dev = ndev;

	return 0;

863
 fail:
864 865 866 867
	free_netdev(ndev);
	return ret;
}

868
void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
869 870
{
	ASSERT_RTNL();
871

872
	mutex_lock(&sdata->local->iflist_mtx);
873
	list_del_rcu(&sdata->list);
874 875
	mutex_unlock(&sdata->local->iflist_mtx);

876
	synchronize_rcu();
877
	unregister_netdevice(sdata->dev);
878 879
}

880 881 882 883 884
/*
 * Remove all interfaces, may only be called at hardware unregistration
 * time because it doesn't do RCU-safe list removals.
 */
void ieee80211_remove_interfaces(struct ieee80211_local *local)
885
{
886
	struct ieee80211_sub_if_data *sdata, *tmp;
887 888 889

	ASSERT_RTNL();

890
	list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
891 892 893 894 895 896 897
		/*
		 * we cannot hold the iflist_mtx across unregister_netdevice,
		 * but we only need to hold it for list modifications to lock
		 * out readers since we're under the RTNL here as all other
		 * writers.
		 */
		mutex_lock(&local->iflist_mtx);
898
		list_del(&sdata->list);
899 900
		mutex_unlock(&local->iflist_mtx);

901
		unregister_netdevice(sdata->dev);
902 903
	}
}