iface.c 35.8 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
 *
 * 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.
 */
13
#include <linux/slab.h>
14 15 16 17 18
#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <net/mac80211.h>
19
#include <net/ieee80211_radiotap.h>
20 21
#include "ieee80211_i.h"
#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"
Bill Jordan's avatar
Bill Jordan committed
27
#include "rate.h"
28

29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
/**
 * 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.
 */


46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66
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;
}

67 68 69
static int ieee80211_change_mac(struct net_device *dev, void *addr)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
70
	struct sockaddr *sa = addr;
71 72
	int ret;

73
	if (ieee80211_sdata_running(sdata))
74 75
		return -EBUSY;

76
	ret = eth_mac_addr(dev, sa);
77 78

	if (ret == 0)
79
		memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
80 81 82 83

	return ret;
}

84 85 86 87 88 89 90 91 92 93 94 95 96 97
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));
}

98 99
static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
					    enum nl80211_iftype iftype)
100
{
101
	struct ieee80211_local *local = sdata->local;
102 103
	struct ieee80211_sub_if_data *nsdata;
	struct net_device *dev = sdata->dev;
104

105
	ASSERT_RTNL();
106 107 108 109 110

	/* 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;

111
		if (ndev != dev && ieee80211_sdata_running(nsdata)) {
112 113 114 115 116 117 118 119 120 121
			/*
			 * 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...
			 */
122
			if (iftype == NL80211_IFTYPE_ADHOC &&
123 124 125 126 127 128 129 130 131 132 133 134 135
			    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
			 */
136
			if (!identical_mac_addr_allowed(iftype,
137 138 139 140 141 142
							nsdata->vif.type))
				return -ENOTUNIQ;

			/*
			 * can only add VLANs to enabled APs
			 */
143
			if (iftype == NL80211_IFTYPE_AP_VLAN &&
144 145 146 147 148
			    nsdata->vif.type == NL80211_IFTYPE_AP)
				sdata->bss = &nsdata->u.ap;
		}
	}

149 150 151
	return 0;
}

152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171
void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
				    const int offset)
{
	struct ieee80211_local *local = sdata->local;
	u32 flags = sdata->u.mntr_flags;

#define ADJUST(_f, _s)	do {					\
	if (flags & MONITOR_FLAG_##_f)				\
		local->fif_##_s += offset;			\
	} while (0)

	ADJUST(FCSFAIL, fcsfail);
	ADJUST(PLCPFAIL, plcpfail);
	ADJUST(CONTROL, control);
	ADJUST(CONTROL, pspoll);
	ADJUST(OTHER_BSS, other_bss);

#undef ADJUST
}

172 173 174 175 176 177
/*
 * NOTE: Be very careful when changing this function, it must NOT return
 * an error on interface type changes that have been pre-checked, so most
 * checks should be in ieee80211_check_concurrent_iface.
 */
static int ieee80211_do_open(struct net_device *dev, bool coming_up)
178 179 180 181 182 183 184 185
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
	u32 changed = 0;
	int res;
	u32 hw_reconf_flags = 0;

186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205
	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:
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_MONITOR:
	case NL80211_IFTYPE_ADHOC:
		/* no special treatment */
		break;
	case NL80211_IFTYPE_UNSPECIFIED:
206
	case NUM_NL80211_IFTYPES:
207 208
	case NL80211_IFTYPE_P2P_CLIENT:
	case NL80211_IFTYPE_P2P_GO:
209 210 211 212 213 214
		/* cannot happen */
		WARN_ON(1);
		break;
	}

	if (local->open_count == 0) {
215
		res = drv_start(local);
216 217
		if (res)
			goto err_del_bss;
218 219
		if (local->ops->napi_poll)
			napi_enable(&local->napi);
220 221
		/* we're brought up, everything changes */
		hw_reconf_flags = ~0;
Johannes Berg's avatar
Johannes Berg committed
222
		ieee80211_led_radio(local, true);
223 224
		ieee80211_mod_tpt_led_trig(local,
					   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
225 226 227
	}

	/*
228 229
	 * Copy the hopefully now-present MAC address to
	 * this interface, if it has the special null one.
230
	 */
231 232 233 234 235 236 237 238 239 240
	if (is_zero_ether_addr(dev->dev_addr)) {
		memcpy(dev->dev_addr,
		       local->hw.wiphy->perm_addr,
		       ETH_ALEN);
		memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);

		if (!is_valid_ether_addr(dev->dev_addr)) {
			if (!local->open_count)
				drv_stop(local);
			return -EADDRNOTAVAIL;
241
		}
242 243 244 245 246 247 248 249 250 251 252 253 254 255
	}

	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++;
256
		if (local->monitors == 1) {
257 258
			local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
259
		}
260

261
		ieee80211_adjust_monitor_flags(sdata, 1);
262
		ieee80211_configure_filter(local);
263 264

		netif_carrier_on(dev);
265 266
		break;
	default:
267 268 269 270 271
		if (coming_up) {
			res = drv_add_interface(local, &sdata->vif);
			if (res)
				goto err_stop;
		}
272

273
		if (sdata->vif.type == NL80211_IFTYPE_AP) {
274
			local->fif_pspoll++;
275
			local->fif_probe_req++;
276 277

			ieee80211_configure_filter(local);
278 279
		} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
			local->fif_probe_req++;
280
		}
281

282 283 284
		changed |= ieee80211_reset_erp_info(sdata);
		ieee80211_bss_info_change_notify(sdata, changed);

285
		if (sdata->vif.type == NL80211_IFTYPE_STATION)
286 287 288 289 290
			netif_carrier_off(dev);
		else
			netif_carrier_on(dev);
	}

291 292
	set_bit(SDATA_STATE_RUNNING, &sdata->state);

293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309
	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;
		}
Bill Jordan's avatar
Bill Jordan committed
310 311

		rate_control_rate_init(sta);
312 313 314 315 316 317 318 319 320 321 322 323 324
	}

	/*
	 * 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);

325
	mutex_lock(&local->mtx);
326
	hw_reconf_flags |= __ieee80211_recalc_idle(local);
327
	mutex_unlock(&local->mtx);
328

329 330 331
	if (coming_up)
		local->open_count++;

332 333
	if (hw_reconf_flags) {
		ieee80211_hw_config(local, hw_reconf_flags);
334 335 336 337 338 339 340 341
		/*
		 * 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);
	}

342
	ieee80211_recalc_ps(local, -1);
343

344
	netif_tx_start_all_queues(dev);
345 346 347

	return 0;
 err_del_interface:
348
	drv_remove_interface(local, &sdata->vif);
349
 err_stop:
350 351
	if (!local->open_count)
		drv_stop(local);
352 353 354 355
 err_del_bss:
	sdata->bss = NULL;
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
		list_del(&sdata->u.vlan.list);
356
	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
357 358 359
	return res;
}

360
static int ieee80211_open(struct net_device *dev)
361 362
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
363 364 365
	int err;

	/* fail early if user set an invalid address */
366
	if (!is_valid_ether_addr(dev->dev_addr))
367 368 369 370 371 372 373 374 375 376 377 378
		return -EADDRNOTAVAIL;

	err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
	if (err)
		return err;

	return ieee80211_do_open(dev, true);
}

static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
			      bool going_down)
{
379
	struct ieee80211_local *local = sdata->local;
380 381
	unsigned long flags;
	struct sk_buff *skb, *tmp;
382
	u32 hw_reconf_flags = 0;
383
	int i;
384
	enum nl80211_channel_type orig_ct;
385

386 387
	clear_bit(SDATA_STATE_RUNNING, &sdata->state);

388 389 390
	if (local->scan_sdata == sdata)
		ieee80211_scan_cancel(local);

391 392 393
	/*
	 * Stop TX on this interface first.
	 */
394
	netif_tx_stop_all_queues(sdata->dev);
395

396 397 398 399 400
	/*
	 * Purge work for this interface.
	 */
	ieee80211_work_purge(sdata);

401 402 403 404 405 406 407 408 409 410
	/*
	 * 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!)
	 *
411 412 413
	 * This is relevant only in AP, WDS and mesh modes, since in
	 * all other modes we've already removed all stations when
	 * disconnecting etc.
414 415 416 417 418 419 420 421 422 423 424 425 426 427 428
	 */
	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);

429
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
430
		local->fif_pspoll--;
431 432 433 434
		local->fif_probe_req--;
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
		local->fif_probe_req--;
	}
435

436
	netif_addr_lock_bh(sdata->dev);
Johannes Berg's avatar
Johannes Berg committed
437
	spin_lock_bh(&local->filter_lock);
438 439
	__hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
			 sdata->dev->addr_len);
Johannes Berg's avatar
Johannes Berg committed
440
	spin_unlock_bh(&local->filter_lock);
441
	netif_addr_unlock_bh(sdata->dev);
Johannes Berg's avatar
Johannes Berg committed
442

443 444
	ieee80211_configure_filter(local);

445 446
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);
447 448 449

	/* APs need special treatment */
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
450
		struct ieee80211_sub_if_data *vlan, *tmpsdata;
451 452
		struct beacon_data *old_beacon =
			rtnl_dereference(sdata->u.ap.beacon);
453

454 455 456 457
		/* sdata_running will return false, so this will disable */
		ieee80211_bss_info_change_notify(sdata,
						 BSS_CHANGED_BEACON_ENABLED);

458 459 460 461 462
		/* remove beacon */
		rcu_assign_pointer(sdata->u.ap.beacon, NULL);
		synchronize_rcu();
		kfree(old_beacon);

463 464 465 466 467 468
		/* free all potentially still buffered bcast frames */
		while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
			local->total_ps_buffered--;
			dev_kfree_skb(skb);
		}

469
		/* down all dependent devices, that is VLANs */
470
		list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
471 472 473 474 475
					 u.vlan.list)
			dev_close(vlan->dev);
		WARN_ON(!list_empty(&sdata->u.ap.vlans));
	}

476 477
	if (going_down)
		local->open_count--;
478 479 480 481 482 483 484 485 486 487 488 489 490

	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--;
491
		if (local->monitors == 0) {
492 493
			local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
494
		}
495

496
		ieee80211_adjust_monitor_flags(sdata, -1);
497 498 499
		ieee80211_configure_filter(local);
		break;
	default:
500
		flush_work(&sdata->work);
Johannes Berg's avatar
Johannes Berg committed
501 502 503 504 505 506 507 508 509
		/*
		 * 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();
		skb_queue_purge(&sdata->skb_queue);

510
		/*
511 512
		 * Disable beaconing here for mesh only, AP and IBSS
		 * are already taken care of.
513
		 */
514
		if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
515 516 517
			ieee80211_bss_info_change_notify(sdata,
				BSS_CHANGED_BEACON_ENABLED);

518 519 520 521
		/*
		 * Free all remaining keys, there shouldn't be any,
		 * except maybe group keys in AP more or WDS?
		 */
Johannes Berg's avatar
Johannes Berg committed
522
		ieee80211_free_keys(sdata);
523

524 525
		if (going_down)
			drv_remove_interface(local, &sdata->vif);
526 527 528 529
	}

	sdata->bss = NULL;

530
	mutex_lock(&local->mtx);
531
	hw_reconf_flags |= __ieee80211_recalc_idle(local);
532
	mutex_unlock(&local->mtx);
533 534 535

	ieee80211_recalc_ps(local, -1);

536
	if (local->open_count == 0) {
537 538
		if (local->ops->napi_poll)
			napi_disable(&local->napi);
539
		ieee80211_clear_tx_pending(local);
540
		ieee80211_stop_device(local);
541

542 543
		/* no reconfiguring after stop! */
		hw_reconf_flags = 0;
544 545
	}

546 547 548 549 550 551
	/* Re-calculate channel-type, in case there are multiple vifs
	 * on different channel types.
	 */
	orig_ct = local->_oper_channel_type;
	ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);

552
	/* do after stop to avoid reconfiguring when we stop anyway */
553
	if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
554 555
		ieee80211_hw_config(local, hw_reconf_flags);

556 557 558 559 560 561 562 563 564 565 566
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
		skb_queue_walk_safe(&local->pending[i], skb, tmp) {
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
			if (info->control.vif == &sdata->vif) {
				__skb_unlink(skb, &local->pending[i]);
				dev_kfree_skb_irq(skb);
			}
		}
	}
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
567 568 569 570 571 572 573
}

static int ieee80211_stop(struct net_device *dev)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	ieee80211_do_stop(sdata, true);
574

575 576 577 578 579 580
	return 0;
}

static void ieee80211_set_multicast_list(struct net_device *dev)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
581
	struct ieee80211_local *local = sdata->local;
582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603
	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;
	}
Johannes Berg's avatar
Johannes Berg committed
604
	spin_lock_bh(&local->filter_lock);
605
	__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
Johannes Berg's avatar
Johannes Berg committed
606
	spin_unlock_bh(&local->filter_lock);
607
	ieee80211_queue_work(&local->hw, &local->reconfig_filter);
608 609
}

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
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
	int flushed;
619 620
	int i;

621 622 623
	/* free extra data */
	ieee80211_free_keys(sdata);

624 625
	ieee80211_debugfs_remove_netdev(sdata);

626
	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
627 628
		__skb_queue_purge(&sdata->fragments[i].skb_list);
	sdata->fragment_next = 0;
629

630 631
	if (ieee80211_vif_is_mesh(&sdata->vif))
		mesh_rmc_free(sdata);
632 633 634

	flushed = sta_info_flush(local, sdata);
	WARN_ON(flushed);
635 636
}

637 638 639 640 641 642
static u16 ieee80211_netdev_select_queue(struct net_device *dev,
					 struct sk_buff *skb)
{
	return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
}

643 644 645 646 647 648 649
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,
650
	.ndo_set_mac_address 	= ieee80211_change_mac,
651
	.ndo_select_queue	= ieee80211_netdev_select_queue,
652 653
};

654 655 656 657 658 659 660
static u16 ieee80211_monitor_select_queue(struct net_device *dev,
					  struct sk_buff *skb)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_hdr *hdr;
	struct ieee80211_radiotap_header *rtap = (void *)skb->data;
661
	u8 *p;
662 663 664 665 666

	if (local->hw.queues < 4)
		return 0;

	if (skb->len < 4 ||
Johannes Berg's avatar
Johannes Berg committed
667
	    skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
668 669
		return 0; /* doesn't matter, frame will be dropped */

Johannes Berg's avatar
Johannes Berg committed
670
	hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
671

672
	if (!ieee80211_is_data(hdr->frame_control)) {
673 674 675
		skb->priority = 7;
		return ieee802_1d_to_ac[skb->priority];
	}
676 677 678 679
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
		skb->priority = 0;
		return ieee802_1d_to_ac[skb->priority];
	}
680

681 682 683
	p = ieee80211_get_qos_ctl(hdr);
	skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;

684 685 686
	return ieee80211_downgrade_queue(local, skb);
}

687 688 689 690 691 692 693 694
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,
695
	.ndo_select_queue	= ieee80211_monitor_select_queue,
696 697 698 699 700
};

static void ieee80211_if_setup(struct net_device *dev)
{
	ether_setup(dev);
701
	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
702 703 704 705
	dev->netdev_ops = &ieee80211_dataif_ops;
	dev->destructor = free_netdev;
}

706 707 708 709 710 711
static void ieee80211_iface_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data, work);
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
712
	struct sta_info *sta;
713
	struct ieee80211_ra_tid *ra_tid;
714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730

	if (!ieee80211_sdata_running(sdata))
		return;

	if (local->scanning)
		return;

	/*
	 * ieee80211_queue_work() should have picked up most cases,
	 * here we'll pick the rest.
	 */
	if (WARN(local->suspended,
		 "interface work scheduled while going to suspend\n"))
		return;

	/* first process frames */
	while ((skb = skb_dequeue(&sdata->skb_queue))) {
731 732
		struct ieee80211_mgmt *mgmt = (void *)skb->data;

733 734 735 736 737 738 739 740 741 742
		if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
			ra_tid = (void *)&skb->cb;
			ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
						 ra_tid->tid);
		} else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
			ra_tid = (void *)&skb->cb;
			ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
						ra_tid->tid);
		} else if (ieee80211_is_action(mgmt->frame_control) &&
			   mgmt->u.action.category == WLAN_CATEGORY_BACK) {
743 744
			int len = skb->len;

745
			mutex_lock(&local->sta_mtx);
746
			sta = sta_info_get_bss(sdata, mgmt->sa);
747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765
			if (sta) {
				switch (mgmt->u.action.u.addba_req.action_code) {
				case WLAN_ACTION_ADDBA_REQ:
					ieee80211_process_addba_request(
							local, sta, mgmt, len);
					break;
				case WLAN_ACTION_ADDBA_RESP:
					ieee80211_process_addba_resp(local, sta,
								     mgmt, len);
					break;
				case WLAN_ACTION_DELBA:
					ieee80211_process_delba(sdata, sta,
								mgmt, len);
					break;
				default:
					WARN_ON(1);
					break;
				}
			}
766
			mutex_unlock(&local->sta_mtx);
767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785
		} else if (ieee80211_is_data_qos(mgmt->frame_control)) {
			struct ieee80211_hdr *hdr = (void *)mgmt;
			/*
			 * So the frame isn't mgmt, but frame_control
			 * is at the right place anyway, of course, so
			 * the if statement is correct.
			 *
			 * Warn if we have other data frame types here,
			 * they must not get here.
			 */
			WARN_ON(hdr->frame_control &
					cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
			WARN_ON(!(hdr->seq_ctrl &
					cpu_to_le16(IEEE80211_SCTL_FRAG)));
			/*
			 * This was a fragment of a frame, received while
			 * a block-ack session was active. That cannot be
			 * right, so terminate the session.
			 */
786
			mutex_lock(&local->sta_mtx);
787
			sta = sta_info_get_bss(sdata, mgmt->sa);
788 789 790 791 792 793
			if (sta) {
				u16 tid = *ieee80211_get_qos_ctl(hdr) &
						IEEE80211_QOS_CTL_TID_MASK;

				__ieee80211_stop_rx_ba_session(
					sta, tid, WLAN_BACK_RECIPIENT,
794 795
					WLAN_REASON_QSTA_REQUIRE_SETUP,
					true);
796
			}
797
			mutex_unlock(&local->sta_mtx);
798
		} else switch (sdata->vif.type) {
799 800 801 802 803 804 805 806 807 808 809 810 811 812 813
		case NL80211_IFTYPE_STATION:
			ieee80211_sta_rx_queued_mgmt(sdata, skb);
			break;
		case NL80211_IFTYPE_ADHOC:
			ieee80211_ibss_rx_queued_mgmt(sdata, skb);
			break;
		case NL80211_IFTYPE_MESH_POINT:
			if (!ieee80211_vif_is_mesh(&sdata->vif))
				break;
			ieee80211_mesh_rx_queued_mgmt(sdata, skb);
			break;
		default:
			WARN(1, "frame for unexpected interface type");
			break;
		}
814 815

		kfree_skb(skb);
816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836
	}

	/* then other type-dependent work */
	switch (sdata->vif.type) {
	case NL80211_IFTYPE_STATION:
		ieee80211_sta_work(sdata);
		break;
	case NL80211_IFTYPE_ADHOC:
		ieee80211_ibss_work(sdata);
		break;
	case NL80211_IFTYPE_MESH_POINT:
		if (!ieee80211_vif_is_mesh(&sdata->vif))
			break;
		ieee80211_mesh_work(sdata);
		break;
	default:
		break;
	}
}


837 838 839 840
/*
 * Helper function to initialise an interface to a specific type.
 */
static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
841
				  enum nl80211_iftype type)
842
{
843 844 845 846 847
	/* clear type-dependent union */
	memset(&sdata->u, 0, sizeof(sdata->u));

	/* and set some type-dependent values */
	sdata->vif.type = type;
848
	sdata->vif.p2p = false;
849
	sdata->dev->netdev_ops = &ieee80211_dataif_ops;
Johannes Berg's avatar
Johannes Berg committed
850
	sdata->wdev.iftype = type;
851

852 853 854
	sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
	sdata->control_port_no_encrypt = false;

855 856 857
	/* only monitor differs */
	sdata->dev->type = ARPHRD_ETHER;

Johannes Berg's avatar
Johannes Berg committed
858
	skb_queue_head_init(&sdata->skb_queue);
859
	INIT_WORK(&sdata->work, ieee80211_iface_work);
Johannes Berg's avatar
Johannes Berg committed
860

861
	switch (type) {
862 863 864 865 866
	case NL80211_IFTYPE_P2P_GO:
		type = NL80211_IFTYPE_AP;
		sdata->vif.type = type;
		sdata->vif.p2p = true;
		/* fall through */
867
	case NL80211_IFTYPE_AP:
868 869 870
		skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
		INIT_LIST_HEAD(&sdata->u.ap.vlans);
		break;
871 872 873 874 875
	case NL80211_IFTYPE_P2P_CLIENT:
		type = NL80211_IFTYPE_STATION;
		sdata->vif.type = type;
		sdata->vif.p2p = true;
		/* fall through */
876
	case NL80211_IFTYPE_STATION:
877
		ieee80211_sta_setup_sdata(sdata);
878
		break;
879 880 881
	case NL80211_IFTYPE_ADHOC:
		ieee80211_ibss_setup_sdata(sdata);
		break;
882
	case NL80211_IFTYPE_MESH_POINT:
883 884 885
		if (ieee80211_vif_is_mesh(&sdata->vif))
			ieee80211_mesh_init_sdata(sdata);
		break;
886
	case NL80211_IFTYPE_MONITOR:
887
		sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
888
		sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
889 890 891
		sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
				      MONITOR_FLAG_OTHER_BSS;
		break;
892 893
	case NL80211_IFTYPE_WDS:
	case NL80211_IFTYPE_AP_VLAN:
894
		break;
895
	case NL80211_IFTYPE_UNSPECIFIED:
896
	case NUM_NL80211_IFTYPES:
897 898 899 900 901 902 903
		BUG();
		break;
	}

	ieee80211_debugfs_add_netdev(sdata);
}

904 905 906 907 908
static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
					   enum nl80211_iftype type)
{
	struct ieee80211_local *local = sdata->local;
	int ret, err;
909 910
	enum nl80211_iftype internal_type = type;
	bool p2p = false;
911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942

	ASSERT_RTNL();

	if (!local->ops->change_interface)
		return -EBUSY;

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_ADHOC:
		/*
		 * Could maybe also all others here?
		 * Just not sure how that interacts
		 * with the RX/config path e.g. for
		 * mesh.
		 */
		break;
	default:
		return -EBUSY;
	}

	switch (type) {
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_ADHOC:
		/*
		 * Could probably support everything
		 * but WDS here (WDS do_open can fail
		 * under memory pressure, which this
		 * code isn't prepared to handle).
		 */
		break;
943 944 945 946 947 948 949 950
	case NL80211_IFTYPE_P2P_CLIENT:
		p2p = true;
		internal_type = NL80211_IFTYPE_STATION;
		break;
	case NL80211_IFTYPE_P2P_GO:
		p2p = true;
		internal_type = NL80211_IFTYPE_AP;
		break;
951 952 953 954
	default:
		return -EBUSY;
	}

955
	ret = ieee80211_check_concurrent_iface(sdata, internal_type);
956 957 958 959 960 961 962
	if (ret)
		return ret;

	ieee80211_do_stop(sdata, false);

	ieee80211_teardown_sdata(sdata->dev);

963
	ret = drv_change_interface(local, sdata, internal_type, p2p);
964 965 966 967 968 969 970 971 972 973 974
	if (ret)
		type = sdata->vif.type;

	ieee80211_setup_sdata(sdata, type);

	err = ieee80211_do_open(sdata->dev, false);
	WARN(err, "type change: do_open returned %d", err);

	return ret;
}

975
int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
976
			     enum nl80211_iftype type)
977
{
978 979
	int ret;

980 981
	ASSERT_RTNL();

982
	if (type == ieee80211_vif_type_p2p(&sdata->vif))
983 984
		return 0;

985
	/* Setting ad-hoc mode on non-IBSS channel is not supported. */
986 987
	if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
	    type == NL80211_IFTYPE_ADHOC)
988 989
		return -EOPNOTSUPP;

990 991 992 993 994 995 996 997 998
	if (ieee80211_sdata_running(sdata)) {
		ret = ieee80211_runtime_change_iftype(sdata, type);
		if (ret)
			return ret;
	} else {
		/* Purge and reset type-dependent state. */
		ieee80211_teardown_sdata(sdata->dev);
		ieee80211_setup_sdata(sdata, type);
	}
999 1000

	/* reset some values that shouldn't be kept across type changes */
1001
	sdata->vif.bss_conf.basic_rates =
1002 1003
		ieee80211_mandatory_rates(sdata->local,
			sdata->local->hw.conf.channel->band);
1004
	sdata->drop_unencrypted = 0;
1005 1006
	if (type == NL80211_IFTYPE_STATION)
		sdata->u.mgd.use_4addr = false;
1007 1008

	return 0;
1009 1010
}

1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122
static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
				       struct net_device *dev,
				       enum nl80211_iftype type)
{
	struct ieee80211_sub_if_data *sdata;
	u64 mask, start, addr, val, inc;
	u8 *m;
	u8 tmp_addr[ETH_ALEN];
	int i;

	/* default ... something at least */
	memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);

	if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
	    local->hw.wiphy->n_addresses <= 1)
		return;


	mutex_lock(&local->iflist_mtx);

	switch (type) {
	case NL80211_IFTYPE_MONITOR:
		/* doesn't matter */
		break;
	case NL80211_IFTYPE_WDS:
	case NL80211_IFTYPE_AP_VLAN:
		/* match up with an AP interface */
		list_for_each_entry(sdata, &local->interfaces, list) {
			if (sdata->vif.type != NL80211_IFTYPE_AP)
				continue;
			memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
			break;
		}
		/* keep default if no AP interface present */
		break;
	default:
		/* assign a new address if possible -- try n_addresses first */
		for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
			bool used = false;

			list_for_each_entry(sdata, &local->interfaces, list) {
				if (memcmp(local->hw.wiphy->addresses[i].addr,
					   sdata->vif.addr, ETH_ALEN) == 0) {
					used = true;
					break;
				}
			}

			if (!used) {
				memcpy(dev->perm_addr,
				       local->hw.wiphy->addresses[i].addr,
				       ETH_ALEN);
				break;
			}
		}

		/* try mask if available */
		if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
			break;

		m = local->hw.wiphy->addr_mask;
		mask =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);

		if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
			/* not a contiguous mask ... not handled now! */
			printk(KERN_DEBUG "not contiguous\n");
			break;
		}

		m = local->hw.wiphy->perm_addr;
		start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);

		inc = 1ULL<<__ffs64(mask);
		val = (start & mask);
		addr = (start & ~mask) | (val & mask);
		do {
			bool used = false;

			tmp_addr[5] = addr >> 0*8;
			tmp_addr[4] = addr >> 1*8;
			tmp_addr[3] = addr >> 2*8;
			tmp_addr[2] = addr >> 3*8;
			tmp_addr[1] = addr >> 4*8;
			tmp_addr[0] = addr >> 5*8;

			val += inc;

			list_for_each_entry(sdata, &local->interfaces, list) {
				if (memcmp(tmp_addr, sdata->vif.addr,
							ETH_ALEN) == 0) {
					used = true;
					break;
				}
			}

			if (!used) {
				memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
				break;
			}
			addr = (start & ~mask) | (val & mask);
		} while (addr != start);

		break;
	}

	mutex_unlock(&local->iflist_mtx);
}

1123
int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1124
		     struct net_device **new_dev, enum nl80211_iftype type,