iface.c 41.6 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 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102
static u32 ieee80211_idle_off(struct ieee80211_local *local,
			      const char *reason)
{
	if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
		return 0;

	local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
	return IEEE80211_CONF_CHANGE_IDLE;
}

static u32 ieee80211_idle_on(struct ieee80211_local *local)
{
	if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
		return 0;

	drv_flush(local, false);

	local->hw.conf.flags |= IEEE80211_CONF_IDLE;
	return IEEE80211_CONF_CHANGE_IDLE;
}

static u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
{
	struct ieee80211_sub_if_data *sdata;
	int count = 0;
	bool working = false, scanning = false;
	unsigned int led_trig_start = 0, led_trig_stop = 0;
	struct ieee80211_roc_work *roc;

#ifdef CONFIG_PROVE_LOCKING
	WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
		!lockdep_is_held(&local->iflist_mtx));
#endif
	lockdep_assert_held(&local->mtx);

	list_for_each_entry(sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(sdata)) {
			sdata->vif.bss_conf.idle = true;
			continue;
		}

		sdata->old_idle = sdata->vif.bss_conf.idle;

		/* do not count disabled managed interfaces */
		if (sdata->vif.type == NL80211_IFTYPE_STATION &&
		    !sdata->u.mgd.associated &&
		    !sdata->u.mgd.auth_data &&
		    !sdata->u.mgd.assoc_data) {
			sdata->vif.bss_conf.idle = true;
			continue;
		}
		/* do not count unused IBSS interfaces */
		if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
		    !sdata->u.ibss.ssid_len) {
			sdata->vif.bss_conf.idle = true;
			continue;
		}
103 104 105 106

		if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
			continue;

107 108 109 110 111 112 113 114 115 116 117 118
		/* count everything else */
		sdata->vif.bss_conf.idle = false;
		count++;
	}

	if (!local->ops->remain_on_channel) {
		list_for_each_entry(roc, &local->roc_list, list) {
			working = true;
			roc->sdata->vif.bss_conf.idle = false;
		}
	}

119 120 121
	sdata = rcu_dereference_protected(local->scan_sdata,
					  lockdep_is_held(&local->mtx));
	if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
122
		scanning = true;
123
		sdata->vif.bss_conf.idle = false;
124 125 126 127
	}

	list_for_each_entry(sdata, &local->interfaces, list) {
		if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
128 129
		    sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
		    sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172
			continue;
		if (sdata->old_idle == sdata->vif.bss_conf.idle)
			continue;
		if (!ieee80211_sdata_running(sdata))
			continue;
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
	}

	if (working || scanning)
		led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
	else
		led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;

	if (count)
		led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
	else
		led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;

	ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);

	if (working)
		return ieee80211_idle_off(local, "working");
	if (scanning)
		return ieee80211_idle_off(local, "scanning");
	if (!count)
		return ieee80211_idle_on(local);
	else
		return ieee80211_idle_off(local, "in use");

	return 0;
}

void ieee80211_recalc_idle(struct ieee80211_local *local)
{
	u32 chg;

	mutex_lock(&local->iflist_mtx);
	chg = __ieee80211_recalc_idle(local);
	mutex_unlock(&local->iflist_mtx);
	if (chg)
		ieee80211_hw_config(local, chg);
}

173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190
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;
}

191 192 193
static int ieee80211_change_mac(struct net_device *dev, void *addr)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
194
	struct sockaddr *sa = addr;
195 196
	int ret;

197
	if (ieee80211_sdata_running(sdata))
198 199
		return -EBUSY;

200
	ret = eth_mac_addr(dev, sa);
201 202

	if (ret == 0)
203
		memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
204 205 206 207

	return ret;
}

208 209 210 211
static inline int identical_mac_addr_allowed(int type1, int type2)
{
	return type1 == NL80211_IFTYPE_MONITOR ||
		type2 == NL80211_IFTYPE_MONITOR ||
212 213
		type1 == NL80211_IFTYPE_P2P_DEVICE ||
		type2 == NL80211_IFTYPE_P2P_DEVICE ||
214 215 216 217 218 219 220 221 222 223
		(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));
}

224 225
static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
					    enum nl80211_iftype iftype)
226
{
227
	struct ieee80211_local *local = sdata->local;
228
	struct ieee80211_sub_if_data *nsdata;
229

230
	ASSERT_RTNL();
231 232 233

	/* we hold the RTNL here so can safely walk the list */
	list_for_each_entry(nsdata, &local->interfaces, list) {
234
		if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
235 236 237 238 239 240 241 242 243 244
			/*
			 * 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...
			 */
245
			if (iftype == NL80211_IFTYPE_ADHOC &&
246 247 248 249 250 251 252
			    nsdata->vif.type == NL80211_IFTYPE_ADHOC)
				return -EBUSY;

			/*
			 * The remaining checks are only performed for interfaces
			 * with the same MAC address.
			 */
253 254
			if (!ether_addr_equal(sdata->vif.addr,
					      nsdata->vif.addr))
255 256 257 258 259
				continue;

			/*
			 * check whether it may have the same address
			 */
260
			if (!identical_mac_addr_allowed(iftype,
261 262 263 264 265 266
							nsdata->vif.type))
				return -ENOTUNIQ;

			/*
			 * can only add VLANs to enabled APs
			 */
267
			if (iftype == NL80211_IFTYPE_AP_VLAN &&
268 269 270 271 272
			    nsdata->vif.type == NL80211_IFTYPE_AP)
				sdata->bss = &nsdata->u.ap;
		}
	}

273 274 275
	return 0;
}

276 277 278 279 280 281 282 283 284 285 286 287 288 289
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;
	}

290 291
	if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
	    !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
292 293 294 295 296 297 298 299 300 301 302 303 304
		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;
}

305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324
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
}

325 326 327 328 329 330 331 332
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;
333
		else if (local->hw.queues >= IEEE80211_NUM_ACS)
334
			sdata->vif.hw_queue[i] = i;
335 336
		else
			sdata->vif.hw_queue[i] = 0;
337 338 339 340
	}
	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
}

341
static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
342 343
{
	struct ieee80211_sub_if_data *sdata;
344
	int ret = 0;
345 346 347 348

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

349 350
	mutex_lock(&local->iflist_mtx);

351
	if (local->monitor_sdata)
352
		goto out_unlock;
353 354

	sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
355 356 357 358
	if (!sdata) {
		ret = -ENOMEM;
		goto out_unlock;
	}
359 360 361 362 363 364 365

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

366 367
	ieee80211_set_default_queues(sdata);

368 369 370 371
	ret = drv_add_interface(local, sdata);
	if (WARN_ON(ret)) {
		/* ok .. stupid driver, it asked for this! */
		kfree(sdata);
372
		goto out_unlock;
373 374
	}

375 376 377
	ret = ieee80211_check_queues(sdata);
	if (ret) {
		kfree(sdata);
378
		goto out_unlock;
379 380
	}

381
	rcu_assign_pointer(local->monitor_sdata, sdata);
382 383 384
 out_unlock:
	mutex_unlock(&local->iflist_mtx);
	return ret;
385 386
}

387
static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
388 389 390 391 392 393
{
	struct ieee80211_sub_if_data *sdata;

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

394
	mutex_lock(&local->iflist_mtx);
395

396 397
	sdata = rcu_dereference_protected(local->monitor_sdata,
					  lockdep_is_held(&local->iflist_mtx));
398
	if (!sdata)
399
		goto out_unlock;
400 401 402 403 404 405 406

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

	drv_remove_interface(local, sdata);

	kfree(sdata);
407 408
 out_unlock:
	mutex_unlock(&local->iflist_mtx);
409 410
}

411 412 413 414 415
/*
 * 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.
 */
416
int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
417
{
418 419
	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
	struct net_device *dev = wdev->netdev;
420 421 422 423 424 425
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
	u32 changed = 0;
	int res;
	u32 hw_reconf_flags = 0;

426 427 428 429 430
	switch (sdata->vif.type) {
	case NL80211_IFTYPE_WDS:
		if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
			return -ENOLINK;
		break;
431 432 433
	case NL80211_IFTYPE_AP_VLAN: {
		struct ieee80211_sub_if_data *master;

434 435
		if (!sdata->bss)
			return -ENOLINK;
436

437
		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
438 439 440 441 442 443 444

		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;
445
		break;
446
		}
447 448 449 450 451 452 453
	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:
454
	case NL80211_IFTYPE_P2P_DEVICE:
455 456 457
		/* no special treatment */
		break;
	case NL80211_IFTYPE_UNSPECIFIED:
458
	case NUM_NL80211_IFTYPES:
459 460
	case NL80211_IFTYPE_P2P_CLIENT:
	case NL80211_IFTYPE_P2P_GO:
461 462 463 464 465 466
		/* cannot happen */
		WARN_ON(1);
		break;
	}

	if (local->open_count == 0) {
467
		res = drv_start(local);
468 469
		if (res)
			goto err_del_bss;
470 471
		if (local->ops->napi_poll)
			napi_enable(&local->napi);
472 473
		/* we're brought up, everything changes */
		hw_reconf_flags = ~0;
Johannes Berg's avatar
Johannes Berg committed
474
		ieee80211_led_radio(local, true);
475 476
		ieee80211_mod_tpt_led_trig(local,
					   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
477 478 479
	}

	/*
480 481
	 * Copy the hopefully now-present MAC address to
	 * this interface, if it has the special null one.
482
	 */
483
	if (dev && is_zero_ether_addr(dev->dev_addr)) {
484 485 486 487 488 489
		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)) {
490 491
			res = -EADDRNOTAVAIL;
			goto err_stop;
492
		}
493 494 495 496
	}

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_AP_VLAN:
497 498 499 500 501
		/* no need to tell driver, but set carrier */
		if (rtnl_dereference(sdata->bss->beacon))
			netif_carrier_on(dev);
		else
			netif_carrier_off(dev);
502 503 504 505 506 507 508
		break;
	case NL80211_IFTYPE_MONITOR:
		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
			local->cooked_mntrs++;
			break;
		}

509 510 511 512 513 514
		if (local->monitors == 0 && local->open_count == 0) {
			res = ieee80211_add_virtual_monitor(local);
			if (res)
				goto err_stop;
		}

515 516
		/* must be before the call to ieee80211_configure_filter */
		local->monitors++;
517
		if (local->monitors == 1) {
518 519
			local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
520
		}
521

522
		ieee80211_adjust_monitor_flags(sdata, 1);
523
		ieee80211_configure_filter(local);
524 525

		netif_carrier_on(dev);
526 527
		break;
	default:
528
		if (coming_up) {
529 530
			ieee80211_del_virtual_monitor(local);

531
			res = drv_add_interface(local, sdata);
532 533
			if (res)
				goto err_stop;
534 535 536
			res = ieee80211_check_queues(sdata);
			if (res)
				goto err_del_interface;
537
		}
538

539
		if (sdata->vif.type == NL80211_IFTYPE_AP) {
540
			local->fif_pspoll++;
541
			local->fif_probe_req++;
542 543

			ieee80211_configure_filter(local);
544 545
		} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
			local->fif_probe_req++;
546
		}
547

548 549
		if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
			changed |= ieee80211_reset_erp_info(sdata);
550 551
		ieee80211_bss_info_change_notify(sdata, changed);

552 553 554 555 556
		switch (sdata->vif.type) {
		case NL80211_IFTYPE_STATION:
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_MESH_POINT:
557
			netif_carrier_off(dev);
558
			break;
559
		case NL80211_IFTYPE_WDS:
560
		case NL80211_IFTYPE_P2P_DEVICE:
561
			break;
562
		default:
563
			netif_carrier_on(dev);
564
		}
565 566 567 568 569 570

		/*
		 * set default queue parameters so drivers don't
		 * need to initialise the hardware if the hardware
		 * doesn't start up with sane defaults
		 */
571
		ieee80211_set_wmm_default(sdata, true);
572 573
	}

574 575
	set_bit(SDATA_STATE_RUNNING, &sdata->state);

576 577 578 579 580 581 582 583 584
	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;
		}

585 586 587
		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);
588 589 590 591 592 593

		res = sta_info_insert(sta);
		if (res) {
			/* STA has been freed */
			goto err_del_interface;
		}
Bill Jordan's avatar
Bill Jordan committed
594 595

		rate_control_rate_init(sta);
596
		netif_carrier_on(dev);
597 598
	} else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
		rcu_assign_pointer(local->p2p_sdata, sdata);
599 600 601 602 603 604 605 606 607 608 609 610 611
	}

	/*
	 * 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);

612
	mutex_lock(&local->mtx);
613
	hw_reconf_flags |= __ieee80211_recalc_idle(local);
614
	mutex_unlock(&local->mtx);
615

616 617 618
	if (coming_up)
		local->open_count++;

619
	if (hw_reconf_flags)
620
		ieee80211_hw_config(local, hw_reconf_flags);
621

622
	ieee80211_recalc_ps(local, -1);
623

624 625
	if (dev)
		netif_tx_start_all_queues(dev);
626 627 628

	return 0;
 err_del_interface:
629
	drv_remove_interface(local, sdata);
630
 err_stop:
631 632
	if (!local->open_count)
		drv_stop(local);
633 634 635 636
 err_del_bss:
	sdata->bss = NULL;
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
		list_del(&sdata->u.vlan.list);
637
	/* might already be clear but that doesn't matter */
638
	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
639 640 641
	return res;
}

642
static int ieee80211_open(struct net_device *dev)
643 644
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
645 646 647
	int err;

	/* fail early if user set an invalid address */
648
	if (!is_valid_ether_addr(dev->dev_addr))
649 650 651 652 653 654
		return -EADDRNOTAVAIL;

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

655
	return ieee80211_do_open(&sdata->wdev, true);
656 657 658 659 660
}

static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
			      bool going_down)
{
661
	struct ieee80211_local *local = sdata->local;
662 663
	unsigned long flags;
	struct sk_buff *skb, *tmp;
664
	u32 hw_reconf_flags = 0;
665
	int i;
666
	enum nl80211_channel_type orig_ct;
667

668 669
	clear_bit(SDATA_STATE_RUNNING, &sdata->state);

670
	if (rcu_access_pointer(local->scan_sdata) == sdata)
671 672
		ieee80211_scan_cancel(local);

673 674 675
	/*
	 * Stop TX on this interface first.
	 */
676 677
	if (sdata->dev)
		netif_tx_stop_all_queues(sdata->dev);
678

679
	ieee80211_roc_purge(sdata);
680

681 682 683 684 685 686 687 688 689 690
	/*
	 * 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!)
	 *
691 692 693
	 * This is relevant only in AP, WDS and mesh modes, since in
	 * all other modes we've already removed all stations when
	 * disconnecting etc.
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708
	 */
	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);

709
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
710
		local->fif_pspoll--;
711 712 713 714
		local->fif_probe_req--;
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
		local->fif_probe_req--;
	}
715

716 717 718 719 720 721 722
	if (sdata->dev) {
		netif_addr_lock_bh(sdata->dev);
		spin_lock_bh(&local->filter_lock);
		__hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
				 sdata->dev->addr_len);
		spin_unlock_bh(&local->filter_lock);
		netif_addr_unlock_bh(sdata->dev);
Johannes Berg's avatar
Johannes Berg committed
723

724 725
		ieee80211_configure_filter(local);
	}
726

727 728
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);
729 730 731

	/* APs need special treatment */
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
732
		struct ieee80211_sub_if_data *vlan, *tmpsdata;
733 734
		struct beacon_data *old_beacon =
			rtnl_dereference(sdata->u.ap.beacon);
735
		struct probe_resp *old_probe_resp =
736
			rtnl_dereference(sdata->u.ap.probe_resp);
737

738 739 740 741
		/* sdata_running will return false, so this will disable */
		ieee80211_bss_info_change_notify(sdata,
						 BSS_CHANGED_BEACON_ENABLED);

742
		/* remove beacon and probe response */
743
		RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
744
		RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
745 746
		synchronize_rcu();
		kfree(old_beacon);
747
		kfree(old_probe_resp);
748 749

		/* down all dependent devices, that is VLANs */
750
		list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
751 752 753
					 u.vlan.list)
			dev_close(vlan->dev);
		WARN_ON(!list_empty(&sdata->u.ap.vlans));
754 755 756 757

		/* 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);
758 759
	} else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
		ieee80211_mgd_stop(sdata);
760 761
	}

762 763
	if (going_down)
		local->open_count--;
764 765 766 767 768 769 770 771 772 773 774 775 776

	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--;
777
		if (local->monitors == 0) {
778 779
			local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
780
			ieee80211_del_virtual_monitor(local);
781
		}
782

783
		ieee80211_adjust_monitor_flags(sdata, -1);
784 785
		ieee80211_configure_filter(local);
		break;
786 787 788 789
	case NL80211_IFTYPE_P2P_DEVICE:
		/* relies on synchronize_rcu() below */
		rcu_assign_pointer(local->p2p_sdata, NULL);
		/* fall through */
790
	default:
791
		flush_work(&sdata->work);
Johannes Berg's avatar
Johannes Berg committed
792 793 794 795 796 797 798 799 800
		/*
		 * 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);

801 802 803 804
		/*
		 * 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
805
		ieee80211_free_keys(sdata);
806

807
		if (going_down)
808
			drv_remove_interface(local, sdata);
809 810 811 812
	}

	sdata->bss = NULL;

813
	mutex_lock(&local->mtx);
814
	hw_reconf_flags |= __ieee80211_recalc_idle(local);
815
	mutex_unlock(&local->mtx);
816 817 818

	ieee80211_recalc_ps(local, -1);

819
	if (local->open_count == 0) {
820 821
		if (local->ops->napi_poll)
			napi_disable(&local->napi);
822
		ieee80211_clear_tx_pending(local);
823
		ieee80211_stop_device(local);
824

825 826
		/* no reconfiguring after stop! */
		hw_reconf_flags = 0;
827 828
	}

829 830 831 832 833 834
	/* 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);

835
	/* do after stop to avoid reconfiguring when we stop anyway */
836
	if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
837 838
		ieee80211_hw_config(local, hw_reconf_flags);

839 840 841 842 843 844 845 846 847 848 849
	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);
850 851 852

	if (local->monitors == local->open_count && local->monitors > 0)
		ieee80211_add_virtual_monitor(local);
853 854 855 856 857 858 859
}

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);
860

861 862 863 864 865 866
	return 0;
}

static void ieee80211_set_multicast_list(struct net_device *dev)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
867
	struct ieee80211_local *local = sdata->local;
868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889
	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
890
	spin_lock_bh(&local->filter_lock);
891
	__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
Johannes Berg's avatar
Johannes Berg committed
892
	spin_unlock_bh(&local->filter_lock);
893
	ieee80211_queue_work(&local->hw, &local->reconfig_filter);
894 895
}

896 897 898 899
/*
 * Called when the netdev is removed or, by the code below, before
 * the interface type changes.
 */
900
static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
901
{
902 903
	struct ieee80211_local *local = sdata->local;
	int flushed;
904 905
	int i;

906 907 908
	/* free extra data */
	ieee80211_free_keys(sdata);

909 910
	ieee80211_debugfs_remove_netdev(sdata);

911
	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
912 913
		__skb_queue_purge(&sdata->fragments[i].skb_list);
	sdata->fragment_next = 0;
914

915 916
	if (ieee80211_vif_is_mesh(&sdata->vif))
		mesh_rmc_free(sdata);
917 918 919

	flushed = sta_info_flush(local, sdata);
	WARN_ON(flushed);
920 921
}

922 923 924 925 926
static void ieee80211_uninit(struct net_device *dev)
{
	ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
}

927 928 929 930 931 932
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);
}

933 934 935
static const struct net_device_ops ieee80211_dataif_ops = {
	.ndo_open		= ieee80211_open,
	.ndo_stop		= ieee80211_stop,
936
	.ndo_uninit		= ieee80211_uninit,
937
	.ndo_start_xmit		= ieee80211_subif_start_xmit,
938
	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
939
	.ndo_change_mtu 	= ieee80211_change_mtu,
940
	.ndo_set_mac_address 	= ieee80211_change_mac,
941
	.ndo_select_queue	= ieee80211_netdev_select_queue,
942 943
};

944 945 946 947 948 949 950 951
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;

952
	if (local->hw.queues < IEEE80211_NUM_ACS)
953 954 955
		return 0;

	if (skb->len < 4 ||
Johannes Berg's avatar
Johannes Berg committed
956
	    skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
957 958
		return 0; /* doesn't matter, frame will be dropped */

Johannes Berg's avatar
Johannes Berg committed
959
	hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
960

961
	return ieee80211_select_queue_80211(sdata, skb, hdr);
962 963
}

964 965 966
static const struct net_device_ops ieee80211_monitorif_ops = {
	.ndo_open		= ieee80211_open,
	.ndo_stop		= ieee80211_stop,
967
	.ndo_uninit		= ieee80211_uninit,
968
	.ndo_start_xmit		= ieee80211_monitor_start_xmit,
969
	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
970 971
	.ndo_change_mtu 	= ieee80211_change_mtu,
	.ndo_set_mac_address 	= eth_mac_addr,
972
	.ndo_select_queue	= ieee80211_monitor_select_queue,
973 974 975 976 977
};

static void ieee80211_if_setup(struct net_device *dev)
{
	ether_setup(dev);
978
	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
979 980 981 982
	dev->netdev_ops = &ieee80211_dataif_ops;
	dev->destructor = free_netdev;
}

983 984 985 986 987 988
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;
989
	struct sta_info *sta;
990
	struct ieee80211_ra_tid *ra_tid;
991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007

	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))) {
1008 1009
		struct ieee80211_mgmt *mgmt = (void *)skb->data;

1010 1011 1012 1013 1014 1015 1016 1017 1018 1019
		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) {
1020 1021
			int len = skb->len;

1022
			mutex_lock(&local->sta_mtx);
1023
			sta = sta_info_get_bss(sdata, mgmt->sa);
1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042
			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;
				}
			}
1043
			mutex_unlock(&local->sta_mtx);
1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062
		} 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.
			 */
1063
			mutex_lock(&local->sta_mtx);
1064
			sta = sta_info_get_bss(sdata, mgmt->sa);
1065 1066 1067 1068 1069 1070
			if (sta) {
				u16 tid = *ieee80211_get_qos_ctl(hdr) &
						IEEE80211_QOS_CTL_TID_MASK;

				__ieee80211_stop_rx_ba_session(
					sta, tid, WLAN_BACK_RECIPIENT,
1071 1072
					WLAN_REASON_QSTA_REQUIRE_SETUP,
					true);
1073
			}
1074
			mutex_unlock(&local->sta_mtx);
1075
		} else switch (sdata->vif.type) {