iface.c 39.9 KB
Newer Older
1
/*
2 3
 * Interface handling (except master interface)
 *
4 5 6
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7
 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8 9 10 11 12
 *
 * 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114
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;
		}
		/* 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;
		}
	}

115 116 117
	sdata = rcu_dereference_protected(local->scan_sdata,
					  lockdep_is_held(&local->mtx));
	if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
118
		scanning = true;
119
		sdata->vif.bss_conf.idle = false;
120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167
	}

	list_for_each_entry(sdata, &local->interfaces, list) {
		if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
		    sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
			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);
}

168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185
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;
}

186 187 188
static int ieee80211_change_mac(struct net_device *dev, void *addr)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
189
	struct sockaddr *sa = addr;
190 191
	int ret;

192
	if (ieee80211_sdata_running(sdata))
193 194
		return -EBUSY;

195
	ret = eth_mac_addr(dev, sa);
196 197

	if (ret == 0)
198
		memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
199 200 201 202

	return ret;
}

203 204 205 206 207 208 209 210 211 212 213 214 215 216
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));
}

217 218
static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
					    enum nl80211_iftype iftype)
219
{
220
	struct ieee80211_local *local = sdata->local;
221
	struct ieee80211_sub_if_data *nsdata;
222

223
	ASSERT_RTNL();
224 225 226

	/* we hold the RTNL here so can safely walk the list */
	list_for_each_entry(nsdata, &local->interfaces, list) {
227
		if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
228 229 230 231 232 233 234 235 236 237
			/*
			 * 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...
			 */
238
			if (iftype == NL80211_IFTYPE_ADHOC &&
239 240 241 242 243 244 245
			    nsdata->vif.type == NL80211_IFTYPE_ADHOC)
				return -EBUSY;

			/*
			 * The remaining checks are only performed for interfaces
			 * with the same MAC address.
			 */
246 247
			if (!ether_addr_equal(sdata->vif.addr,
					      nsdata->vif.addr))
248 249 250 251 252
				continue;

			/*
			 * check whether it may have the same address
			 */
253
			if (!identical_mac_addr_allowed(iftype,
254 255 256 257 258 259
							nsdata->vif.type))
				return -ENOTUNIQ;

			/*
			 * can only add VLANs to enabled APs
			 */
260
			if (iftype == NL80211_IFTYPE_AP_VLAN &&
261 262 263 264 265
			    nsdata->vif.type == NL80211_IFTYPE_AP)
				sdata->bss = &nsdata->u.ap;
		}
	}

266 267 268
	return 0;
}

269 270 271 272 273 274 275 276 277 278 279 280 281 282
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;
	}

283 284
	if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
	    !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
285 286 287 288 289 290 291 292 293 294 295 296 297
		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;
}

298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317
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
}

318 319 320 321 322 323 324 325
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;
326
		else if (local->hw.queues >= IEEE80211_NUM_ACS)
327
			sdata->vif.hw_queue[i] = i;
328 329
		else
			sdata->vif.hw_queue[i] = 0;
330 331 332 333
	}
	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
}

334
static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
335 336
{
	struct ieee80211_sub_if_data *sdata;
337
	int ret = 0;
338 339 340 341

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

342 343
	mutex_lock(&local->iflist_mtx);

344
	if (local->monitor_sdata)
345
		goto out_unlock;
346 347

	sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
348 349 350 351
	if (!sdata) {
		ret = -ENOMEM;
		goto out_unlock;
	}
352 353 354 355 356 357 358

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

359 360
	ieee80211_set_default_queues(sdata);

361 362 363 364
	ret = drv_add_interface(local, sdata);
	if (WARN_ON(ret)) {
		/* ok .. stupid driver, it asked for this! */
		kfree(sdata);
365
		goto out_unlock;
366 367
	}

368 369 370
	ret = ieee80211_check_queues(sdata);
	if (ret) {
		kfree(sdata);
371
		goto out_unlock;
372 373
	}

374
	rcu_assign_pointer(local->monitor_sdata, sdata);
375 376 377
 out_unlock:
	mutex_unlock(&local->iflist_mtx);
	return ret;
378 379
}

380
static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
381 382 383 384 385 386
{
	struct ieee80211_sub_if_data *sdata;

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

387
	mutex_lock(&local->iflist_mtx);
388

389 390
	sdata = rcu_dereference_protected(local->monitor_sdata,
					  lockdep_is_held(&local->iflist_mtx));
391
	if (!sdata)
392
		goto out_unlock;
393 394 395 396 397 398 399

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

	drv_remove_interface(local, sdata);

	kfree(sdata);
400 401
 out_unlock:
	mutex_unlock(&local->iflist_mtx);
402 403
}

404 405 406 407 408 409
/*
 * 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)
410 411 412 413 414 415 416 417
{
	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;

418 419 420 421 422
	switch (sdata->vif.type) {
	case NL80211_IFTYPE_WDS:
		if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
			return -ENOLINK;
		break;
423 424 425
	case NL80211_IFTYPE_AP_VLAN: {
		struct ieee80211_sub_if_data *master;

426 427
		if (!sdata->bss)
			return -ENOLINK;
428

429
		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
430 431 432 433 434 435 436

		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;
437
		break;
438
		}
439 440 441 442 443 444 445 446 447 448
	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:
449
	case NUM_NL80211_IFTYPES:
450 451
	case NL80211_IFTYPE_P2P_CLIENT:
	case NL80211_IFTYPE_P2P_GO:
452 453 454 455 456 457
		/* cannot happen */
		WARN_ON(1);
		break;
	}

	if (local->open_count == 0) {
458
		res = drv_start(local);
459 460
		if (res)
			goto err_del_bss;
461 462
		if (local->ops->napi_poll)
			napi_enable(&local->napi);
463 464
		/* we're brought up, everything changes */
		hw_reconf_flags = ~0;
Johannes Berg's avatar
Johannes Berg committed
465
		ieee80211_led_radio(local, true);
466 467
		ieee80211_mod_tpt_led_trig(local,
					   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
468 469 470
	}

	/*
471 472
	 * Copy the hopefully now-present MAC address to
	 * this interface, if it has the special null one.
473
	 */
474 475 476 477 478 479 480
	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)) {
481 482
			res = -EADDRNOTAVAIL;
			goto err_stop;
483
		}
484 485 486 487
	}

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_AP_VLAN:
488 489 490 491 492
		/* no need to tell driver, but set carrier */
		if (rtnl_dereference(sdata->bss->beacon))
			netif_carrier_on(dev);
		else
			netif_carrier_off(dev);
493 494 495 496 497 498 499
		break;
	case NL80211_IFTYPE_MONITOR:
		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
			local->cooked_mntrs++;
			break;
		}

500 501 502 503 504 505
		if (local->monitors == 0 && local->open_count == 0) {
			res = ieee80211_add_virtual_monitor(local);
			if (res)
				goto err_stop;
		}

506 507
		/* must be before the call to ieee80211_configure_filter */
		local->monitors++;
508
		if (local->monitors == 1) {
509 510
			local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
511
		}
512

513
		ieee80211_adjust_monitor_flags(sdata, 1);
514
		ieee80211_configure_filter(local);
515 516

		netif_carrier_on(dev);
517 518
		break;
	default:
519
		if (coming_up) {
520 521
			ieee80211_del_virtual_monitor(local);

522
			res = drv_add_interface(local, sdata);
523 524
			if (res)
				goto err_stop;
525 526 527
			res = ieee80211_check_queues(sdata);
			if (res)
				goto err_del_interface;
528
		}
529

530
		if (sdata->vif.type == NL80211_IFTYPE_AP) {
531
			local->fif_pspoll++;
532
			local->fif_probe_req++;
533 534

			ieee80211_configure_filter(local);
535 536
		} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
			local->fif_probe_req++;
537
		}
538

539 540 541
		changed |= ieee80211_reset_erp_info(sdata);
		ieee80211_bss_info_change_notify(sdata, changed);

542 543 544 545 546
		switch (sdata->vif.type) {
		case NL80211_IFTYPE_STATION:
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_MESH_POINT:
547
			netif_carrier_off(dev);
548 549
			break;
		default:
550
			netif_carrier_on(dev);
551
		}
552 553 554 555 556 557

		/*
		 * set default queue parameters so drivers don't
		 * need to initialise the hardware if the hardware
		 * doesn't start up with sane defaults
		 */
558
		ieee80211_set_wmm_default(sdata, true);
559 560
	}

561 562
	set_bit(SDATA_STATE_RUNNING, &sdata->state);

563 564 565 566 567 568 569 570 571
	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;
		}

572 573 574
		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);
575 576 577 578 579 580

		res = sta_info_insert(sta);
		if (res) {
			/* STA has been freed */
			goto err_del_interface;
		}
Bill Jordan's avatar
Bill Jordan committed
581 582

		rate_control_rate_init(sta);
583 584 585 586 587 588 589 590 591 592 593 594 595
	}

	/*
	 * 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);

596
	mutex_lock(&local->mtx);
597
	hw_reconf_flags |= __ieee80211_recalc_idle(local);
598
	mutex_unlock(&local->mtx);
599

600 601 602
	if (coming_up)
		local->open_count++;

603
	if (hw_reconf_flags)
604
		ieee80211_hw_config(local, hw_reconf_flags);
605

606
	ieee80211_recalc_ps(local, -1);
607

608
	netif_tx_start_all_queues(dev);
609 610 611

	return 0;
 err_del_interface:
612
	drv_remove_interface(local, sdata);
613
 err_stop:
614 615
	if (!local->open_count)
		drv_stop(local);
616 617 618 619
 err_del_bss:
	sdata->bss = NULL;
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
		list_del(&sdata->u.vlan.list);
620
	/* might already be clear but that doesn't matter */
621
	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
622 623 624
	return res;
}

625
static int ieee80211_open(struct net_device *dev)
626 627
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
628 629 630
	int err;

	/* fail early if user set an invalid address */
631
	if (!is_valid_ether_addr(dev->dev_addr))
632 633 634 635 636 637 638 639 640 641 642 643
		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)
{
644
	struct ieee80211_local *local = sdata->local;
645 646
	unsigned long flags;
	struct sk_buff *skb, *tmp;
647
	u32 hw_reconf_flags = 0;
648
	int i;
649
	enum nl80211_channel_type orig_ct;
650

651 652
	clear_bit(SDATA_STATE_RUNNING, &sdata->state);

653
	if (rcu_access_pointer(local->scan_sdata) == sdata)
654 655
		ieee80211_scan_cancel(local);

656 657 658
	/*
	 * Stop TX on this interface first.
	 */
659
	netif_tx_stop_all_queues(sdata->dev);
660

661
	ieee80211_roc_purge(sdata);
662

663 664 665 666 667 668 669 670 671 672
	/*
	 * 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!)
	 *
673 674 675
	 * This is relevant only in AP, WDS and mesh modes, since in
	 * all other modes we've already removed all stations when
	 * disconnecting etc.
676 677 678 679 680 681 682 683 684 685 686 687 688 689 690
	 */
	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);

691
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
692
		local->fif_pspoll--;
693 694 695 696
		local->fif_probe_req--;
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
		local->fif_probe_req--;
	}
697

698
	netif_addr_lock_bh(sdata->dev);
Johannes Berg's avatar
Johannes Berg committed
699
	spin_lock_bh(&local->filter_lock);
700 701
	__hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
			 sdata->dev->addr_len);
Johannes Berg's avatar
Johannes Berg committed
702
	spin_unlock_bh(&local->filter_lock);
703
	netif_addr_unlock_bh(sdata->dev);
Johannes Berg's avatar
Johannes Berg committed
704

705 706
	ieee80211_configure_filter(local);

707 708
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);
709 710 711

	/* APs need special treatment */
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
712
		struct ieee80211_sub_if_data *vlan, *tmpsdata;
713 714
		struct beacon_data *old_beacon =
			rtnl_dereference(sdata->u.ap.beacon);
715 716
		struct sk_buff *old_probe_resp =
			rtnl_dereference(sdata->u.ap.probe_resp);
717

718 719 720 721
		/* sdata_running will return false, so this will disable */
		ieee80211_bss_info_change_notify(sdata,
						 BSS_CHANGED_BEACON_ENABLED);

722
		/* remove beacon and probe response */
723
		RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
724
		RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
725 726
		synchronize_rcu();
		kfree(old_beacon);
727
		kfree_skb(old_probe_resp);
728 729

		/* down all dependent devices, that is VLANs */
730
		list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
731 732 733
					 u.vlan.list)
			dev_close(vlan->dev);
		WARN_ON(!list_empty(&sdata->u.ap.vlans));
734 735 736 737

		/* 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);
738 739
	} else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
		ieee80211_mgd_stop(sdata);
740 741
	}

742 743
	if (going_down)
		local->open_count--;
744 745 746 747 748 749 750 751 752 753 754 755 756

	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--;
757
		if (local->monitors == 0) {
758 759
			local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
760
			ieee80211_del_virtual_monitor(local);
761
		}
762

763
		ieee80211_adjust_monitor_flags(sdata, -1);
764 765 766
		ieee80211_configure_filter(local);
		break;
	default:
767
		flush_work(&sdata->work);
Johannes Berg's avatar
Johannes Berg committed
768 769 770 771 772 773 774 775 776
		/*
		 * 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);

777
		/*
778 779
		 * Disable beaconing here for mesh only, AP and IBSS
		 * are already taken care of.
780
		 */
781
		if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
782 783 784
			ieee80211_bss_info_change_notify(sdata,
				BSS_CHANGED_BEACON_ENABLED);

785 786 787 788
		/*
		 * 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
789
		ieee80211_free_keys(sdata);
790

791
		if (going_down)
792
			drv_remove_interface(local, sdata);
793 794 795 796
	}

	sdata->bss = NULL;

797
	mutex_lock(&local->mtx);
798
	hw_reconf_flags |= __ieee80211_recalc_idle(local);
799
	mutex_unlock(&local->mtx);
800 801 802

	ieee80211_recalc_ps(local, -1);

803
	if (local->open_count == 0) {
804 805
		if (local->ops->napi_poll)
			napi_disable(&local->napi);
806
		ieee80211_clear_tx_pending(local);
807
		ieee80211_stop_device(local);
808

809 810
		/* no reconfiguring after stop! */
		hw_reconf_flags = 0;
811 812
	}

813 814 815 816 817 818
	/* 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);

819
	/* do after stop to avoid reconfiguring when we stop anyway */
820
	if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
821 822
		ieee80211_hw_config(local, hw_reconf_flags);

823 824 825 826 827 828 829 830 831 832 833
	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);
834 835 836

	if (local->monitors == local->open_count && local->monitors > 0)
		ieee80211_add_virtual_monitor(local);
837 838 839 840 841 842 843
}

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);
844

845 846 847 848 849 850
	return 0;
}

static void ieee80211_set_multicast_list(struct net_device *dev)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
851
	struct ieee80211_local *local = sdata->local;
852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873
	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
874
	spin_lock_bh(&local->filter_lock);
875
	__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
Johannes Berg's avatar
Johannes Berg committed
876
	spin_unlock_bh(&local->filter_lock);
877
	ieee80211_queue_work(&local->hw, &local->reconfig_filter);
878 879
}

880 881 882 883 884
/*
 * 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)
885
{
886 887 888
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
	int flushed;
889 890
	int i;

891 892 893
	/* free extra data */
	ieee80211_free_keys(sdata);

894 895
	ieee80211_debugfs_remove_netdev(sdata);

896
	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
897 898
		__skb_queue_purge(&sdata->fragments[i].skb_list);
	sdata->fragment_next = 0;
899

900 901
	if (ieee80211_vif_is_mesh(&sdata->vif))
		mesh_rmc_free(sdata);
902 903 904

	flushed = sta_info_flush(local, sdata);
	WARN_ON(flushed);
905 906
}

907 908 909 910 911 912
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);
}

913 914 915 916 917
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,
918
	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
919
	.ndo_change_mtu 	= ieee80211_change_mtu,
920
	.ndo_set_mac_address 	= ieee80211_change_mac,
921
	.ndo_select_queue	= ieee80211_netdev_select_queue,
922 923
};

924 925 926 927 928 929 930 931
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;

932
	if (local->hw.queues < IEEE80211_NUM_ACS)
933 934 935
		return 0;

	if (skb->len < 4 ||
Johannes Berg's avatar
Johannes Berg committed
936
	    skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
937 938
		return 0; /* doesn't matter, frame will be dropped */

Johannes Berg's avatar
Johannes Berg committed
939
	hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
940

941
	return ieee80211_select_queue_80211(sdata, skb, hdr);
942 943
}

944 945 946 947 948
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,
949
	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
950 951
	.ndo_change_mtu 	= ieee80211_change_mtu,
	.ndo_set_mac_address 	= eth_mac_addr,
952
	.ndo_select_queue	= ieee80211_monitor_select_queue,
953 954 955 956 957
};

static void ieee80211_if_setup(struct net_device *dev)
{
	ether_setup(dev);
958
	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
959 960 961 962
	dev->netdev_ops = &ieee80211_dataif_ops;
	dev->destructor = free_netdev;
}

963 964 965 966 967 968
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;
969
	struct sta_info *sta;
970
	struct ieee80211_ra_tid *ra_tid;
971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987

	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))) {
988 989
		struct ieee80211_mgmt *mgmt = (void *)skb->data;

990 991 992 993 994 995 996 997 998 999
		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) {
1000 1001
			int len = skb->len;

1002
			mutex_lock(&local->sta_mtx);
1003
			sta = sta_info_get_bss(sdata, mgmt->sa);
1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022
			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;
				}
			}
1023
			mutex_unlock(&local->sta_mtx);
1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042
		} 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.
			 */
1043
			mutex_lock(&local->sta_mtx);
1044
			sta = sta_info_get_bss(sdata, mgmt->sa);
1045 1046 1047 1048 1049 1050
			if (sta) {
				u16 tid = *ieee80211_get_qos_ctl(hdr) &
						IEEE80211_QOS_CTL_TID_MASK;

				__ieee80211_stop_rx_ba_session(
					sta, tid, WLAN_BACK_RECIPIENT,
1051 1052
					WLAN_REASON_QSTA_REQUIRE_SETUP,
					true);
1053
			}
1054
			mutex_unlock(&local->sta_mtx);
1055
		} else switch (sdata->vif.type) {
1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070
		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;
		}
1071 1072

		kfree_skb(skb);
1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093
	}

	/* 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;
	}
}


1094 1095 1096 1097
/*
 * Helper function to initialise an interface to a specific type.
 */
static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1098
				  enum nl80211_iftype type)
1099
{
1100 1101 1102 1103 1104
	/* clear type-dependent union */
	memset(&sdata->u, 0, sizeof(sdata->u));

	/* and set some type-dependent values */
	sdata->vif.type = type;
1105
	sdata->vif.p2p = false;
1106
	sdata->dev->netdev_ops = &ieee80211_dataif_ops;
Johannes Berg's avatar
Johannes Berg committed
1107
	sdata->wdev.iftype = type;
1108

1109 1110 1111
	sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
	sdata->control_port_no_encrypt = false;

1112 1113
	sdata->noack_map = 0;