iface.c 39.6 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
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;
	}

	dev->mtu = new_mtu;
	return 0;
}

64 65 66
static int ieee80211_change_mac(struct net_device *dev, void *addr)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
67
	struct sockaddr *sa = addr;
68 69
	int ret;

70
	if (ieee80211_sdata_running(sdata))
71 72
		return -EBUSY;

73
	ret = eth_mac_addr(dev, sa);
74 75

	if (ret == 0)
76
		memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
77 78 79 80

	return ret;
}

81 82 83 84 85 86 87 88 89 90 91 92 93 94
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));
}

95 96
static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
					    enum nl80211_iftype iftype)
97
{
98
	struct ieee80211_local *local = sdata->local;
99 100
	struct ieee80211_sub_if_data *nsdata;
	struct net_device *dev = sdata->dev;
101

102
	ASSERT_RTNL();
103 104 105 106 107

	/* 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;

108
		if (ndev != dev && ieee80211_sdata_running(nsdata)) {
109 110 111 112 113 114 115 116 117 118
			/*
			 * 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...
			 */
119
			if (iftype == NL80211_IFTYPE_ADHOC &&
120 121 122 123 124 125 126
			    nsdata->vif.type == NL80211_IFTYPE_ADHOC)
				return -EBUSY;

			/*
			 * The remaining checks are only performed for interfaces
			 * with the same MAC address.
			 */
127
			if (!ether_addr_equal(dev->dev_addr, ndev->dev_addr))
128 129 130 131 132
				continue;

			/*
			 * check whether it may have the same address
			 */
133
			if (!identical_mac_addr_allowed(iftype,
134 135 136 137 138 139
							nsdata->vif.type))
				return -ENOTUNIQ;

			/*
			 * can only add VLANs to enabled APs
			 */
140
			if (iftype == NL80211_IFTYPE_AP_VLAN &&
141 142 143 144 145
			    nsdata->vif.type == NL80211_IFTYPE_AP)
				sdata->bss = &nsdata->u.ap;
		}
	}

146 147 148
	return 0;
}

149 150 151 152 153 154 155 156 157 158 159 160 161 162
static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
{
	int n_queues = sdata->local->hw.queues;
	int i;

	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
		if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
				 IEEE80211_INVAL_HW_QUEUE))
			return -EINVAL;
		if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
				 n_queues))
			return -EINVAL;
	}

163 164
	if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
	    !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
165 166 167 168 169 170 171 172 173 174 175 176 177
		sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
		return 0;
	}

	if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
		return -EINVAL;

	if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
		return -EINVAL;

	return 0;
}

178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197
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
}

198 199 200 201 202 203 204 205
static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	int i;

	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
		if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
			sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
206
		else if (local->hw.queues >= IEEE80211_NUM_ACS)
207
			sdata->vif.hw_queue[i] = i;
208 209
		else
			sdata->vif.hw_queue[i] = 0;
210 211 212 213
	}
	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
}

214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234
static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
{
	struct ieee80211_sub_if_data *sdata;
	int ret;

	if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
		return 0;

	if (local->monitor_sdata)
		return 0;

	sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
	if (!sdata)
		return -ENOMEM;

	/* set up data */
	sdata->local = local;
	sdata->vif.type = NL80211_IFTYPE_MONITOR;
	snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
		 wiphy_name(local->hw.wiphy));

235 236
	ieee80211_set_default_queues(sdata);

237 238 239 240 241 242 243
	ret = drv_add_interface(local, sdata);
	if (WARN_ON(ret)) {
		/* ok .. stupid driver, it asked for this! */
		kfree(sdata);
		return ret;
	}

244 245 246 247 248 249
	ret = ieee80211_check_queues(sdata);
	if (ret) {
		kfree(sdata);
		return ret;
	}

250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274
	rcu_assign_pointer(local->monitor_sdata, sdata);

	return 0;
}

static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
{
	struct ieee80211_sub_if_data *sdata;

	if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
		return;

	sdata = rtnl_dereference(local->monitor_sdata);

	if (!sdata)
		return;

	rcu_assign_pointer(local->monitor_sdata, NULL);
	synchronize_net();

	drv_remove_interface(local, sdata);

	kfree(sdata);
}

275 276 277 278 279 280
/*
 * 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)
281 282 283 284 285 286 287 288
{
	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;

289 290 291 292 293
	switch (sdata->vif.type) {
	case NL80211_IFTYPE_WDS:
		if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
			return -ENOLINK;
		break;
294 295 296
	case NL80211_IFTYPE_AP_VLAN: {
		struct ieee80211_sub_if_data *master;

297 298
		if (!sdata->bss)
			return -ENOLINK;
299

300
		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
301 302 303 304 305 306 307

		master = container_of(sdata->bss,
				      struct ieee80211_sub_if_data, u.ap);
		sdata->control_port_protocol =
			master->control_port_protocol;
		sdata->control_port_no_encrypt =
			master->control_port_no_encrypt;
308
		break;
309
		}
310 311 312 313 314 315 316 317 318 319
	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:
320
	case NUM_NL80211_IFTYPES:
321 322
	case NL80211_IFTYPE_P2P_CLIENT:
	case NL80211_IFTYPE_P2P_GO:
323 324 325 326 327 328
		/* cannot happen */
		WARN_ON(1);
		break;
	}

	if (local->open_count == 0) {
329
		res = drv_start(local);
330 331
		if (res)
			goto err_del_bss;
332 333
		if (local->ops->napi_poll)
			napi_enable(&local->napi);
334 335
		/* we're brought up, everything changes */
		hw_reconf_flags = ~0;
Johannes Berg's avatar
Johannes Berg committed
336
		ieee80211_led_radio(local, true);
337 338
		ieee80211_mod_tpt_led_trig(local,
					   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
339 340 341
	}

	/*
342 343
	 * Copy the hopefully now-present MAC address to
	 * this interface, if it has the special null one.
344
	 */
345 346 347 348 349 350 351
	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)) {
352 353
			res = -EADDRNOTAVAIL;
			goto err_stop;
354
		}
355 356 357 358
	}

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_AP_VLAN:
359 360 361 362 363
		/* no need to tell driver, but set carrier */
		if (rtnl_dereference(sdata->bss->beacon))
			netif_carrier_on(dev);
		else
			netif_carrier_off(dev);
364 365 366 367 368 369 370
		break;
	case NL80211_IFTYPE_MONITOR:
		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
			local->cooked_mntrs++;
			break;
		}

371 372 373 374 375 376
		if (local->monitors == 0 && local->open_count == 0) {
			res = ieee80211_add_virtual_monitor(local);
			if (res)
				goto err_stop;
		}

377 378
		/* must be before the call to ieee80211_configure_filter */
		local->monitors++;
379
		if (local->monitors == 1) {
380 381
			local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
382
		}
383

384
		ieee80211_adjust_monitor_flags(sdata, 1);
385
		ieee80211_configure_filter(local);
386 387

		netif_carrier_on(dev);
388 389
		break;
	default:
390
		if (coming_up) {
391 392
			ieee80211_del_virtual_monitor(local);

393
			res = drv_add_interface(local, sdata);
394 395
			if (res)
				goto err_stop;
396 397 398
			res = ieee80211_check_queues(sdata);
			if (res)
				goto err_del_interface;
399
		}
400

401
		if (sdata->vif.type == NL80211_IFTYPE_AP) {
402
			local->fif_pspoll++;
403
			local->fif_probe_req++;
404 405

			ieee80211_configure_filter(local);
406 407
		} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
			local->fif_probe_req++;
408
		}
409

410 411 412
		changed |= ieee80211_reset_erp_info(sdata);
		ieee80211_bss_info_change_notify(sdata, changed);

413
		if (sdata->vif.type == NL80211_IFTYPE_STATION ||
414 415
		    sdata->vif.type == NL80211_IFTYPE_ADHOC ||
		    sdata->vif.type == NL80211_IFTYPE_AP)
416 417 418
			netif_carrier_off(dev);
		else
			netif_carrier_on(dev);
419 420 421 422 423 424

		/*
		 * set default queue parameters so drivers don't
		 * need to initialise the hardware if the hardware
		 * doesn't start up with sane defaults
		 */
425
		ieee80211_set_wmm_default(sdata, true);
426 427
	}

428 429
	set_bit(SDATA_STATE_RUNNING, &sdata->state);

430 431 432 433 434 435 436 437 438
	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;
		}

439 440 441
		sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
		sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
		sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
442 443 444 445 446 447

		res = sta_info_insert(sta);
		if (res) {
			/* STA has been freed */
			goto err_del_interface;
		}
Bill Jordan's avatar
Bill Jordan committed
448 449

		rate_control_rate_init(sta);
450 451 452 453 454 455 456 457 458 459 460 461 462
	}

	/*
	 * 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);

463
	mutex_lock(&local->mtx);
464
	hw_reconf_flags |= __ieee80211_recalc_idle(local);
465
	mutex_unlock(&local->mtx);
466

467 468 469
	if (coming_up)
		local->open_count++;

470
	if (hw_reconf_flags)
471
		ieee80211_hw_config(local, hw_reconf_flags);
472

473
	ieee80211_recalc_ps(local, -1);
474

475
	netif_tx_start_all_queues(dev);
476 477 478

	return 0;
 err_del_interface:
479
	drv_remove_interface(local, sdata);
480
 err_stop:
481 482
	if (!local->open_count)
		drv_stop(local);
483 484 485 486
 err_del_bss:
	sdata->bss = NULL;
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
		list_del(&sdata->u.vlan.list);
487
	/* might already be clear but that doesn't matter */
488
	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
489 490 491
	return res;
}

492
static int ieee80211_open(struct net_device *dev)
493 494
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
495 496 497
	int err;

	/* fail early if user set an invalid address */
498
	if (!is_valid_ether_addr(dev->dev_addr))
499 500 501 502 503 504 505 506 507 508 509 510
		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)
{
511
	struct ieee80211_local *local = sdata->local;
512 513
	unsigned long flags;
	struct sk_buff *skb, *tmp;
514
	u32 hw_reconf_flags = 0;
515
	int i;
516
	enum nl80211_channel_type orig_ct;
517

518 519
	clear_bit(SDATA_STATE_RUNNING, &sdata->state);

520 521 522
	if (local->scan_sdata == sdata)
		ieee80211_scan_cancel(local);

523 524 525
	/*
	 * Stop TX on this interface first.
	 */
526
	netif_tx_stop_all_queues(sdata->dev);
527

528
	ieee80211_roc_purge(sdata);
529

530 531 532 533 534 535 536 537 538 539
	/*
	 * 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!)
	 *
540 541 542
	 * This is relevant only in AP, WDS and mesh modes, since in
	 * all other modes we've already removed all stations when
	 * disconnecting etc.
543 544 545 546 547 548 549 550 551 552 553 554 555 556 557
	 */
	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);

558
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
559
		local->fif_pspoll--;
560 561 562 563
		local->fif_probe_req--;
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
		local->fif_probe_req--;
	}
564

565
	netif_addr_lock_bh(sdata->dev);
Johannes Berg's avatar
Johannes Berg committed
566
	spin_lock_bh(&local->filter_lock);
567 568
	__hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
			 sdata->dev->addr_len);
Johannes Berg's avatar
Johannes Berg committed
569
	spin_unlock_bh(&local->filter_lock);
570
	netif_addr_unlock_bh(sdata->dev);
Johannes Berg's avatar
Johannes Berg committed
571

572 573
	ieee80211_configure_filter(local);

574 575
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);
576 577 578

	/* APs need special treatment */
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
579
		struct ieee80211_sub_if_data *vlan, *tmpsdata;
580 581
		struct beacon_data *old_beacon =
			rtnl_dereference(sdata->u.ap.beacon);
582 583
		struct sk_buff *old_probe_resp =
			rtnl_dereference(sdata->u.ap.probe_resp);
584

585 586 587 588
		/* sdata_running will return false, so this will disable */
		ieee80211_bss_info_change_notify(sdata,
						 BSS_CHANGED_BEACON_ENABLED);

589
		/* remove beacon and probe response */
590
		RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
591
		RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
592 593
		synchronize_rcu();
		kfree(old_beacon);
594
		kfree_skb(old_probe_resp);
595 596

		/* down all dependent devices, that is VLANs */
597
		list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
598 599 600
					 u.vlan.list)
			dev_close(vlan->dev);
		WARN_ON(!list_empty(&sdata->u.ap.vlans));
601 602 603 604

		/* free all potentially still buffered bcast frames */
		local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
		skb_queue_purge(&sdata->u.ap.ps_bc_buf);
605 606
	} else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
		ieee80211_mgd_stop(sdata);
607 608
	}

609 610
	if (going_down)
		local->open_count--;
611 612 613 614 615 616 617 618 619 620 621 622 623

	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--;
624
		if (local->monitors == 0) {
625 626
			local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
627
			ieee80211_del_virtual_monitor(local);
628
		}
629

630
		ieee80211_adjust_monitor_flags(sdata, -1);
631 632 633
		ieee80211_configure_filter(local);
		break;
	default:
634
		flush_work(&sdata->work);
Johannes Berg's avatar
Johannes Berg committed
635 636 637 638 639 640 641 642 643
		/*
		 * 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);

644
		/*
645 646
		 * Disable beaconing here for mesh only, AP and IBSS
		 * are already taken care of.
647
		 */
648
		if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
649 650 651
			ieee80211_bss_info_change_notify(sdata,
				BSS_CHANGED_BEACON_ENABLED);

652 653 654 655
		/*
		 * 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
656
		ieee80211_free_keys(sdata);
657

658
		if (going_down)
659
			drv_remove_interface(local, sdata);
660 661 662 663
	}

	sdata->bss = NULL;

664
	mutex_lock(&local->mtx);
665
	hw_reconf_flags |= __ieee80211_recalc_idle(local);
666
	mutex_unlock(&local->mtx);
667 668 669

	ieee80211_recalc_ps(local, -1);

670
	if (local->open_count == 0) {
671 672
		if (local->ops->napi_poll)
			napi_disable(&local->napi);
673
		ieee80211_clear_tx_pending(local);
674
		ieee80211_stop_device(local);
675

676 677
		/* no reconfiguring after stop! */
		hw_reconf_flags = 0;
678 679
	}

680 681 682 683 684 685
	/* 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);

686
	/* do after stop to avoid reconfiguring when we stop anyway */
687
	if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
688 689
		ieee80211_hw_config(local, hw_reconf_flags);

690 691 692 693 694 695 696 697 698 699 700
	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);
701 702 703

	if (local->monitors == local->open_count && local->monitors > 0)
		ieee80211_add_virtual_monitor(local);
704 705 706 707 708 709 710
}

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);
711

712 713 714 715 716 717
	return 0;
}

static void ieee80211_set_multicast_list(struct net_device *dev)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
718
	struct ieee80211_local *local = sdata->local;
719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740
	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
741
	spin_lock_bh(&local->filter_lock);
742
	__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
Johannes Berg's avatar
Johannes Berg committed
743
	spin_unlock_bh(&local->filter_lock);
744
	ieee80211_queue_work(&local->hw, &local->reconfig_filter);
745 746
}

747 748 749 750 751
/*
 * 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)
752
{
753 754 755
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
	int flushed;
756 757
	int i;

758 759 760
	/* free extra data */
	ieee80211_free_keys(sdata);

761 762
	ieee80211_debugfs_remove_netdev(sdata);

763
	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
764 765
		__skb_queue_purge(&sdata->fragments[i].skb_list);
	sdata->fragment_next = 0;
766

767 768
	if (ieee80211_vif_is_mesh(&sdata->vif))
		mesh_rmc_free(sdata);
769 770 771

	flushed = sta_info_flush(local, sdata);
	WARN_ON(flushed);
772 773
}

774 775 776 777 778 779
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);
}

780 781 782 783 784
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,
785
	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
786
	.ndo_change_mtu 	= ieee80211_change_mtu,
787
	.ndo_set_mac_address 	= ieee80211_change_mac,
788
	.ndo_select_queue	= ieee80211_netdev_select_queue,
789 790
};

791 792 793 794 795 796 797 798
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;

799
	if (local->hw.queues < IEEE80211_NUM_ACS)
800 801 802
		return 0;

	if (skb->len < 4 ||
Johannes Berg's avatar
Johannes Berg committed
803
	    skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
804 805
		return 0; /* doesn't matter, frame will be dropped */

Johannes Berg's avatar
Johannes Berg committed
806
	hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
807

808
	return ieee80211_select_queue_80211(sdata, skb, hdr);
809 810
}

811 812 813 814 815
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,
816
	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
817 818
	.ndo_change_mtu 	= ieee80211_change_mtu,
	.ndo_set_mac_address 	= eth_mac_addr,
819
	.ndo_select_queue	= ieee80211_monitor_select_queue,
820 821 822 823 824
};

static void ieee80211_if_setup(struct net_device *dev)
{
	ether_setup(dev);
825
	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
826 827 828 829
	dev->netdev_ops = &ieee80211_dataif_ops;
	dev->destructor = free_netdev;
}

830 831 832 833 834 835
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;
836
	struct sta_info *sta;
837
	struct ieee80211_ra_tid *ra_tid;
838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854

	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))) {
855 856
		struct ieee80211_mgmt *mgmt = (void *)skb->data;

857 858 859 860 861 862 863 864 865 866
		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) {
867 868
			int len = skb->len;

869
			mutex_lock(&local->sta_mtx);
870
			sta = sta_info_get_bss(sdata, mgmt->sa);
871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889
			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;
				}
			}
890
			mutex_unlock(&local->sta_mtx);
891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909
		} 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.
			 */
910
			mutex_lock(&local->sta_mtx);
911
			sta = sta_info_get_bss(sdata, mgmt->sa);
912 913 914 915 916 917
			if (sta) {
				u16 tid = *ieee80211_get_qos_ctl(hdr) &
						IEEE80211_QOS_CTL_TID_MASK;

				__ieee80211_stop_rx_ba_session(
					sta, tid, WLAN_BACK_RECIPIENT,
918 919
					WLAN_REASON_QSTA_REQUIRE_SETUP,
					true);
920
			}
921
			mutex_unlock(&local->sta_mtx);
922
		} else switch (sdata->vif.type) {
923 924 925 926 927 928 929 930 931 932 933 934 935 936 937
		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;
		}
938 939

		kfree_skb(skb);
940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960
	}

	/* 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;
	}
}


961 962 963 964
/*
 * Helper function to initialise an interface to a specific type.
 */
static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
965
				  enum nl80211_iftype type)
966
{
967 968 969 970 971
	/* clear type-dependent union */
	memset(&sdata->u, 0, sizeof(sdata->u));

	/* and set some type-dependent values */
	sdata->vif.type = type;
972
	sdata->vif.p2p = false;
973
	sdata->dev->netdev_ops = &ieee80211_dataif_ops;
Johannes Berg's avatar
Johannes Berg committed
974
	sdata->wdev.iftype = type;
975

976 977 978
	sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
	sdata->control_port_no_encrypt = false;

979 980
	sdata->noack_map = 0;

981 982 983
	/* only monitor differs */
	sdata->dev->type = ARPHRD_ETHER;

Johannes Berg's avatar
Johannes Berg committed
984
	skb_queue_head_init(&sdata->skb_queue);
985
	INIT_WORK(&sdata->work, ieee80211_iface_work);
Johannes Berg's avatar
Johannes Berg committed
986

987
	switch (type) {
988 989 990 991 992
	case NL80211_IFTYPE_P2P_GO:
		type = NL80211_IFTYPE_AP;
		sdata->vif.type = type;
		sdata->vif.p2p = true;
		/* fall through */
993
	case NL80211_IFTYPE_AP:
994 995 996
		skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
		INIT_LIST_HEAD(&sdata->u.ap.vlans);
		break;
997 998 999 1000 1001
	case NL80211_IFTYPE_P2P_CLIENT:
		type = NL80211_IFTYPE_STATION;
		sdata->vif.type = type;
		sdata->vif.p2p = true;
		/* fall through */
1002
	case NL80211_IFTYPE_STATION:
1003
		ieee80211_sta_setup_sdata(sdata);
1004
		break;
1005 1006 1007
	case NL80211_IFTYPE_ADHOC:
		ieee80211_ibss_setup_sdata(sdata);
		break;
1008
	case NL80211_IFTYPE_MESH_POINT:
1009 1010 1011
		if (ieee80211_vif_is_mesh(&sdata->vif))
			ieee80211_mesh_init_sdata(sdata);
		break;
1012
	case NL80211_IFTYPE_MONITOR:
1013
		sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1014
		sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1015 1016 1017
		sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
				      MONITOR_FLAG_OTHER_BSS;
		break;
1018 1019
	case NL80211_IFTYPE_WDS:
	case NL80211_IFTYPE_AP_VLAN:
1020
		break;
1021
	case NL80211_IFTYPE_UNSPECIFIED:
1022
	case NUM_NL80211_IFTYPES:
1023 1024 1025 1026 1027 1028 1029
		BUG();
		break;
	}

	ieee80211_debugfs_add_netdev(sdata);
}

1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
static void ieee80211_clean_sdata(struct ieee80211_sub_if_data *sdata)
{
	switch (sdata->vif.type) {
	case NL80211_IFTYPE_MESH_POINT:
		mesh_path_flush_by_iface(sdata);
		break;

	default:
		break;
	}
}

1042 1043 1044 1045 1046
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;
1047 1048
	enum nl80211_iftype internal_type = type;
	bool p2p = false;
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

	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;
1081 1082 1083 1084 1085 1086 1087 1088
	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;
1089 1090 1091 1092
	default:
		return -EBUSY;
	}

1093
	ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1094 1095 1096 1097 1098 1099 1100
	if (ret)
		return ret;

	ieee80211_do_stop(sdata, false);

	ieee80211_teardown_sdata(sdata->dev);

1101
	ret = drv_change_interface(local, sdata, internal_type, p2p);
1102 1103 1104
	if (ret)
		type = sdata->vif.type;

1105 1106 1107 1108 1109 1110 1111
	/*
	 * Ignore return value here, there's not much we can do since
	 * the driver changed the interface type internally already.
	 * The warnings will hopefully make driver authors fix it :-)
	 */
	ieee80211_check_queues(sdata);

1112 1113 1114 1115 1116 1117 1118 1119
	ieee80211_setup_sdata(sdata