iface.c 32.8 KB
Newer Older
1
/*
2 3
 * Interface handling (except master interface)
 *
4 5 6
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7
 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8 9 10 11 12
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
13
#include <linux/slab.h>
14 15 16 17 18
#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <net/mac80211.h>
19
#include <net/ieee80211_radiotap.h>
20 21
#include "ieee80211_i.h"
#include "sta_info.h"
22
#include "debugfs_netdev.h"
23
#include "mesh.h"
24
#include "led.h"
25
#include "driver-ops.h"
26
#include "wme.h"
27

28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
/**
 * 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.
 */


45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65
static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
{
	int meshhdrlen;
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

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

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

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

66 67 68
static int ieee80211_change_mac(struct net_device *dev, void *addr)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
69
	struct sockaddr *sa = addr;
70 71
	int ret;

72
	if (ieee80211_sdata_running(sdata))
73 74
		return -EBUSY;

75
	ret = eth_mac_addr(dev, sa);
76 77

	if (ret == 0)
78
		memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
79 80 81 82

	return ret;
}

83 84 85 86 87 88 89 90 91 92 93 94 95 96
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));
}

97 98
static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
					    enum nl80211_iftype iftype)
99
{
100
	struct ieee80211_local *local = sdata->local;
101 102
	struct ieee80211_sub_if_data *nsdata;
	struct net_device *dev = sdata->dev;
103

104
	ASSERT_RTNL();
105 106 107 108 109

	/* 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;

110
		if (ndev != dev && ieee80211_sdata_running(nsdata)) {
111 112 113 114 115 116 117 118 119 120
			/*
			 * 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...
			 */
121
			if (iftype == NL80211_IFTYPE_ADHOC &&
122 123 124 125 126 127 128 129 130 131 132 133 134
			    nsdata->vif.type == NL80211_IFTYPE_ADHOC)
				return -EBUSY;

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

			/*
			 * check whether it may have the same address
			 */
135
			if (!identical_mac_addr_allowed(iftype,
136 137 138 139 140 141
							nsdata->vif.type))
				return -ENOTUNIQ;

			/*
			 * can only add VLANs to enabled APs
			 */
142
			if (iftype == NL80211_IFTYPE_AP_VLAN &&
143 144 145 146 147
			    nsdata->vif.type == NL80211_IFTYPE_AP)
				sdata->bss = &nsdata->u.ap;
		}
	}

148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168
	return 0;
}

static int ieee80211_open(struct net_device *dev)
{
	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;

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

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

169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193
	switch (sdata->vif.type) {
	case NL80211_IFTYPE_WDS:
		if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
			return -ENOLINK;
		break;
	case NL80211_IFTYPE_AP_VLAN:
		if (!sdata->bss)
			return -ENOLINK;
		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
		break;
	case NL80211_IFTYPE_AP:
		sdata->bss = &sdata->u.ap;
		break;
	case NL80211_IFTYPE_MESH_POINT:
		if (!ieee80211_vif_is_mesh(&sdata->vif))
			break;
		/* mesh ifaces must set allmulti to forward mcast traffic */
		atomic_inc(&local->iff_allmultis);
		break;
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_MONITOR:
	case NL80211_IFTYPE_ADHOC:
		/* no special treatment */
		break;
	case NL80211_IFTYPE_UNSPECIFIED:
194
	case NUM_NL80211_IFTYPES:
195 196 197 198 199 200
		/* cannot happen */
		WARN_ON(1);
		break;
	}

	if (local->open_count == 0) {
201
		res = drv_start(local);
202 203
		if (res)
			goto err_del_bss;
204 205
		if (local->ops->napi_poll)
			napi_enable(&local->napi);
206 207
		/* we're brought up, everything changes */
		hw_reconf_flags = ~0;
Johannes Berg's avatar
Johannes Berg committed
208
		ieee80211_led_radio(local, true);
209 210 211
	}

	/*
212 213
	 * Copy the hopefully now-present MAC address to
	 * this interface, if it has the special null one.
214
	 */
215 216 217 218 219 220 221 222 223 224
	if (is_zero_ether_addr(dev->dev_addr)) {
		memcpy(dev->dev_addr,
		       local->hw.wiphy->perm_addr,
		       ETH_ALEN);
		memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);

		if (!is_valid_ether_addr(dev->dev_addr)) {
			if (!local->open_count)
				drv_stop(local);
			return -EADDRNOTAVAIL;
225
		}
226 227 228 229 230 231 232 233 234 235 236 237 238 239
	}

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

		/* must be before the call to ieee80211_configure_filter */
		local->monitors++;
240
		if (local->monitors == 1) {
241 242
			local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
243
		}
244 245 246 247 248

		if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
			local->fif_fcsfail++;
		if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
			local->fif_plcpfail++;
249
		if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
250
			local->fif_control++;
251 252
			local->fif_pspoll++;
		}
253 254 255 256
		if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
			local->fif_other_bss++;

		ieee80211_configure_filter(local);
257 258

		netif_carrier_on(dev);
259 260
		break;
	default:
261
		res = drv_add_interface(local, &sdata->vif);
262 263 264
		if (res)
			goto err_stop;

265 266 267 268
		if (ieee80211_vif_is_mesh(&sdata->vif)) {
			local->fif_other_bss++;
			ieee80211_configure_filter(local);

269
			ieee80211_start_mesh(sdata);
270 271 272 273
		} else if (sdata->vif.type == NL80211_IFTYPE_AP) {
			local->fif_pspoll++;

			ieee80211_configure_filter(local);
274
		}
275

276 277 278
		changed |= ieee80211_reset_erp_info(sdata);
		ieee80211_bss_info_change_notify(sdata, changed);

279
		if (sdata->vif.type == NL80211_IFTYPE_STATION)
280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314
			netif_carrier_off(dev);
		else
			netif_carrier_on(dev);
	}

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

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

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

	/*
	 * 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);

315
	mutex_lock(&local->mtx);
316
	hw_reconf_flags |= __ieee80211_recalc_idle(local);
317
	mutex_unlock(&local->mtx);
318

319
	local->open_count++;
320 321
	if (hw_reconf_flags) {
		ieee80211_hw_config(local, hw_reconf_flags);
322 323 324 325 326 327 328 329
		/*
		 * set default queue parameters so drivers don't
		 * need to initialise the hardware if the hardware
		 * doesn't start up with sane defaults
		 */
		ieee80211_set_wmm_default(sdata);
	}

330
	ieee80211_recalc_ps(local, -1);
331

332
	netif_tx_start_all_queues(dev);
333 334 335

	return 0;
 err_del_interface:
336
	drv_remove_interface(local, &sdata->vif);
337
 err_stop:
338 339
	if (!local->open_count)
		drv_stop(local);
340 341 342 343 344 345 346 347 348 349 350
 err_del_bss:
	sdata->bss = NULL;
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
		list_del(&sdata->u.vlan.list);
	return res;
}

static int ieee80211_stop(struct net_device *dev)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
351 352
	unsigned long flags;
	struct sk_buff *skb, *tmp;
353
	u32 hw_reconf_flags = 0;
354
	int i;
355 356 357 358

	/*
	 * Stop TX on this interface first.
	 */
359
	netif_tx_stop_all_queues(dev);
360

361 362 363 364 365
	/*
	 * Purge work for this interface.
	 */
	ieee80211_work_purge(sdata);

366 367 368 369 370 371 372 373 374 375
	/*
	 * 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!)
	 *
376 377 378
	 * This is relevant only in AP, WDS and mesh modes, since in
	 * all other modes we've already removed all stations when
	 * disconnecting etc.
379 380 381 382 383 384 385 386 387 388 389 390 391 392 393
	 */
	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);

394 395 396
	if (sdata->vif.type == NL80211_IFTYPE_AP)
		local->fif_pspoll--;

Johannes Berg's avatar
Johannes Berg committed
397 398
	netif_addr_lock_bh(dev);
	spin_lock_bh(&local->filter_lock);
399
	__hw_addr_unsync(&local->mc_list, &dev->mc, dev->addr_len);
Johannes Berg's avatar
Johannes Berg committed
400 401 402
	spin_unlock_bh(&local->filter_lock);
	netif_addr_unlock_bh(dev);

403 404
	ieee80211_configure_filter(local);

405 406
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);
407 408 409

	/* APs need special treatment */
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
410
		struct ieee80211_sub_if_data *vlan, *tmpsdata;
411 412
		struct beacon_data *old_beacon = sdata->u.ap.beacon;

413 414 415 416
		/* sdata_running will return false, so this will disable */
		ieee80211_bss_info_change_notify(sdata,
						 BSS_CHANGED_BEACON_ENABLED);

417 418 419 420 421
		/* remove beacon */
		rcu_assign_pointer(sdata->u.ap.beacon, NULL);
		synchronize_rcu();
		kfree(old_beacon);

422 423 424 425 426 427
		/* free all potentially still buffered bcast frames */
		while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
			local->total_ps_buffered--;
			dev_kfree_skb(skb);
		}

428
		/* down all dependent devices, that is VLANs */
429
		list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448
					 u.vlan.list)
			dev_close(vlan->dev);
		WARN_ON(!list_empty(&sdata->u.ap.vlans));
	}

	local->open_count--;

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

		local->monitors--;
449
		if (local->monitors == 0) {
450 451
			local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
452
		}
453 454 455 456 457

		if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
			local->fif_fcsfail--;
		if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
			local->fif_plcpfail--;
458 459
		if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
			local->fif_pspoll--;
460
			local->fif_control--;
461
		}
462 463 464 465 466 467 468
		if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
			local->fif_other_bss--;

		ieee80211_configure_filter(local);
		break;
	case NL80211_IFTYPE_MESH_POINT:
		if (ieee80211_vif_is_mesh(&sdata->vif)) {
469 470 471
			/* other_bss and allmulti are always set on mesh
			 * ifaces */
			local->fif_other_bss--;
472
			atomic_dec(&local->iff_allmultis);
473 474 475

			ieee80211_configure_filter(local);

476 477 478 479
			ieee80211_stop_mesh(sdata);
		}
		/* fall through */
	default:
480
		flush_work(&sdata->work);
Johannes Berg's avatar
Johannes Berg committed
481 482 483 484 485 486 487 488 489
		/*
		 * 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);

490 491
		if (local->scan_sdata == sdata)
			ieee80211_scan_cancel(local);
492

493
		/*
494 495
		 * Disable beaconing here for mesh only, AP and IBSS
		 * are already taken care of.
496
		 */
497
		if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
498 499 500
			ieee80211_bss_info_change_notify(sdata,
				BSS_CHANGED_BEACON_ENABLED);

501 502 503 504
		/*
		 * 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
505
		ieee80211_free_keys(sdata);
506

507
		drv_remove_interface(local, &sdata->vif);
508 509 510 511
	}

	sdata->bss = NULL;

512
	mutex_lock(&local->mtx);
513
	hw_reconf_flags |= __ieee80211_recalc_idle(local);
514
	mutex_unlock(&local->mtx);
515 516 517

	ieee80211_recalc_ps(local, -1);

518
	if (local->open_count == 0) {
519 520
		if (local->ops->napi_poll)
			napi_disable(&local->napi);
521
		ieee80211_clear_tx_pending(local);
522
		ieee80211_stop_device(local);
523

524 525
		/* no reconfiguring after stop! */
		hw_reconf_flags = 0;
526 527
	}

528 529 530 531
	/* do after stop to avoid reconfiguring when we stop anyway */
	if (hw_reconf_flags)
		ieee80211_hw_config(local, hw_reconf_flags);

532 533 534 535 536 537 538 539 540 541 542 543
	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);

544 545 546 547 548 549
	return 0;
}

static void ieee80211_set_multicast_list(struct net_device *dev)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
550
	struct ieee80211_local *local = sdata->local;
551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572
	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
573
	spin_lock_bh(&local->filter_lock);
574
	__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
Johannes Berg's avatar
Johannes Berg committed
575
	spin_unlock_bh(&local->filter_lock);
576
	ieee80211_queue_work(&local->hw, &local->reconfig_filter);
577 578
}

579 580 581 582 583
/*
 * 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)
584
{
585 586 587
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
	int flushed;
588 589
	int i;

590 591 592
	/* free extra data */
	ieee80211_free_keys(sdata);

593 594
	ieee80211_debugfs_remove_netdev(sdata);

595
	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
596 597
		__skb_queue_purge(&sdata->fragments[i].skb_list);
	sdata->fragment_next = 0;
598

599 600
	if (ieee80211_vif_is_mesh(&sdata->vif))
		mesh_rmc_free(sdata);
601 602 603

	flushed = sta_info_flush(local, sdata);
	WARN_ON(flushed);
604 605
}

606 607 608 609 610 611
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);
}

612 613 614 615 616 617 618
static const struct net_device_ops ieee80211_dataif_ops = {
	.ndo_open		= ieee80211_open,
	.ndo_stop		= ieee80211_stop,
	.ndo_uninit		= ieee80211_teardown_sdata,
	.ndo_start_xmit		= ieee80211_subif_start_xmit,
	.ndo_set_multicast_list = ieee80211_set_multicast_list,
	.ndo_change_mtu 	= ieee80211_change_mtu,
619
	.ndo_set_mac_address 	= ieee80211_change_mac,
620
	.ndo_select_queue	= ieee80211_netdev_select_queue,
621 622
};

623 624 625 626 627 628 629
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;
630
	u8 *p;
631 632 633 634 635

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

	if (skb->len < 4 ||
Johannes Berg's avatar
Johannes Berg committed
636
	    skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
637 638
		return 0; /* doesn't matter, frame will be dropped */

Johannes Berg's avatar
Johannes Berg committed
639
	hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
640

641
	if (!ieee80211_is_data(hdr->frame_control)) {
642 643 644
		skb->priority = 7;
		return ieee802_1d_to_ac[skb->priority];
	}
645 646 647 648
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
		skb->priority = 0;
		return ieee802_1d_to_ac[skb->priority];
	}
649

650 651 652
	p = ieee80211_get_qos_ctl(hdr);
	skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;

653 654 655
	return ieee80211_downgrade_queue(local, skb);
}

656 657 658 659 660 661 662 663
static const struct net_device_ops ieee80211_monitorif_ops = {
	.ndo_open		= ieee80211_open,
	.ndo_stop		= ieee80211_stop,
	.ndo_uninit		= ieee80211_teardown_sdata,
	.ndo_start_xmit		= ieee80211_monitor_start_xmit,
	.ndo_set_multicast_list = ieee80211_set_multicast_list,
	.ndo_change_mtu 	= ieee80211_change_mtu,
	.ndo_set_mac_address 	= eth_mac_addr,
664
	.ndo_select_queue	= ieee80211_monitor_select_queue,
665 666 667 668 669 670 671 672 673
};

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

674 675 676 677 678 679
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;
680
	struct sta_info *sta;
681
	struct ieee80211_ra_tid *ra_tid;
682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698

	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))) {
699 700
		struct ieee80211_mgmt *mgmt = (void *)skb->data;

701 702 703 704 705 706 707 708 709 710
		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) {
711 712
			int len = skb->len;

713
			mutex_lock(&local->sta_mtx);
714
			sta = sta_info_get_bss(sdata, mgmt->sa);
715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733
			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;
				}
			}
734
			mutex_unlock(&local->sta_mtx);
735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753
		} 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.
			 */
754
			mutex_lock(&local->sta_mtx);
755
			sta = sta_info_get_bss(sdata, mgmt->sa);
756 757 758 759 760 761 762 763
			if (sta) {
				u16 tid = *ieee80211_get_qos_ctl(hdr) &
						IEEE80211_QOS_CTL_TID_MASK;

				__ieee80211_stop_rx_ba_session(
					sta, tid, WLAN_BACK_RECIPIENT,
					WLAN_REASON_QSTA_REQUIRE_SETUP);
			}
764
			mutex_unlock(&local->sta_mtx);
765
		} else switch (sdata->vif.type) {
766 767 768 769 770 771 772 773 774 775 776 777 778 779 780
		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;
		}
781 782

		kfree_skb(skb);
783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803
	}

	/* 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;
	}
}


804 805 806 807
/*
 * Helper function to initialise an interface to a specific type.
 */
static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
808
				  enum nl80211_iftype type)
809
{
810 811 812 813 814
	/* clear type-dependent union */
	memset(&sdata->u, 0, sizeof(sdata->u));

	/* and set some type-dependent values */
	sdata->vif.type = type;
815
	sdata->dev->netdev_ops = &ieee80211_dataif_ops;
Johannes Berg's avatar
Johannes Berg committed
816
	sdata->wdev.iftype = type;
817

818 819 820
	sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
	sdata->control_port_no_encrypt = false;

821 822 823
	/* only monitor differs */
	sdata->dev->type = ARPHRD_ETHER;

Johannes Berg's avatar
Johannes Berg committed
824
	skb_queue_head_init(&sdata->skb_queue);
825
	INIT_WORK(&sdata->work, ieee80211_iface_work);
Johannes Berg's avatar
Johannes Berg committed
826

827
	switch (type) {
828
	case NL80211_IFTYPE_AP:
829 830 831
		skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
		INIT_LIST_HEAD(&sdata->u.ap.vlans);
		break;
832
	case NL80211_IFTYPE_STATION:
833
		ieee80211_sta_setup_sdata(sdata);
834
		break;
835 836 837
	case NL80211_IFTYPE_ADHOC:
		ieee80211_ibss_setup_sdata(sdata);
		break;
838
	case NL80211_IFTYPE_MESH_POINT:
839 840 841
		if (ieee80211_vif_is_mesh(&sdata->vif))
			ieee80211_mesh_init_sdata(sdata);
		break;
842
	case NL80211_IFTYPE_MONITOR:
843
		sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
844
		sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
845 846 847
		sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
				      MONITOR_FLAG_OTHER_BSS;
		break;
848 849
	case NL80211_IFTYPE_WDS:
	case NL80211_IFTYPE_AP_VLAN:
850
		break;
851
	case NL80211_IFTYPE_UNSPECIFIED:
852
	case NUM_NL80211_IFTYPES:
853 854 855 856 857 858 859
		BUG();
		break;
	}

	ieee80211_debugfs_add_netdev(sdata);
}

860
int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
861
			     enum nl80211_iftype type)
862
{
863 864 865 866 867
	ASSERT_RTNL();

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

868
	/* Setting ad-hoc mode on non-IBSS channel is not supported. */
869 870
	if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
	    type == NL80211_IFTYPE_ADHOC)
871 872
		return -EOPNOTSUPP;

873 874 875 876 877 878
	/*
	 * We could, here, on changes between IBSS/STA/MESH modes,
	 * invoke an MLME function instead that disassociates etc.
	 * and goes into the requested mode.
	 */

879
	if (ieee80211_sdata_running(sdata))
880 881
		return -EBUSY;

882 883 884 885 886
	/* Purge and reset type-dependent state. */
	ieee80211_teardown_sdata(sdata->dev);
	ieee80211_setup_sdata(sdata, type);

	/* reset some values that shouldn't be kept across type changes */
887
	sdata->vif.bss_conf.basic_rates =
888 889
		ieee80211_mandatory_rates(sdata->local,
			sdata->local->hw.conf.channel->band);
890
	sdata->drop_unencrypted = 0;
891 892
	if (type == NL80211_IFTYPE_STATION)
		sdata->u.mgd.use_4addr = false;
893 894

	return 0;
895 896
}

897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008
static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
				       struct net_device *dev,
				       enum nl80211_iftype type)
{
	struct ieee80211_sub_if_data *sdata;
	u64 mask, start, addr, val, inc;
	u8 *m;
	u8 tmp_addr[ETH_ALEN];
	int i;

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

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


	mutex_lock(&local->iflist_mtx);

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

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

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

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

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

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

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

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

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

			val += inc;

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

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

		break;
	}

	mutex_unlock(&local->iflist_mtx);
}

1009
int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1010
		     struct net_device **new_dev, enum nl80211_iftype type,
1011
		     struct vif_params *params)
1012 1013 1014
{
	struct net_device *ndev;
	struct ieee80211_sub_if_data *sdata = NULL;
1015
	int ret, i;
1016 1017

	ASSERT_RTNL();
1018

1019 1020
	ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size,
			       name, ieee80211_if_setup, local->hw.queues);
1021 1022
	if (!ndev)
		return -ENOMEM;
1023
	dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1024

1025 1026 1027 1028 1029 1030 1031 1032 1033
	ndev->needed_headroom = local->tx_headroom +
				4*6 /* four MAC addresses */
				+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
				+ 6 /* mesh */
				+ 8 /* rfc1042/bridge tunnel */
				- ETH_HLEN /* ethernet hard_header_len */
				+ IEEE80211_ENCRYPT_HEADROOM;
	ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;

1034 1035 1036 1037
	ret = dev_alloc_name(ndev, ndev->name);
	if (ret < 0)
		goto fail;

1038 1039
	ieee80211_assign_perm_addr(local, ndev, type);
	memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1040 1041
	SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));

1042 1043
	/* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
	sdata = netdev_priv(ndev);
1044
	ndev->ieee80211_ptr = &sdata->wdev;
1045 1046
	memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
	memcpy(sdata->name, ndev->name, IFNAMSIZ);
1047 1048

	/* initialise type-independent data */
1049 1050
	sdata->wdev.wiphy = local->hw.wiphy;
	sdata->local = local;
1051
	sdata->dev = ndev;
1052 1053 1054
#ifdef CONFIG_INET
	sdata->arp_filter_state = true;
#endif
1055 1056 1057 1058 1059 1060

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

	INIT_LIST_HEAD(&sdata->key_list);

1061 1062 1063 1064 1065 1066
	for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
		struct ieee80211_supported_band *sband;
		sband = local->hw.wiphy->bands[i];
		sdata->rc_rateidx_mask[i] =
			sband ? (1 << sband->n_bitrates) - 1 : 0;
	}
1067 1068 1069

	/* setup type-dependent data */
	ieee80211_setup_sdata(sdata, type);
1070

1071 1072 1073 1074 1075 1076
	if (params) {
		ndev->ieee80211_ptr->use_4addr = params->use_4addr;
		if (type == NL80211_IFTYPE_STATION)
			sdata->u.mgd.use_4addr = params->use_4addr;
	}

1077 1078 1079 1080
	ret = register_netdevice(ndev);
	if (ret)
		goto fail;

Johannes Berg's avatar
Johannes Berg committed
1081 1082
	if (ieee80211_vif_is_mesh(&sdata->vif) &&
	    params && params->mesh_id_len)
1083 1084 1085
		ieee80211_sdata_set_mesh_id(sdata,
					    params->mesh_id_len,
					    params->mesh_id);
1086

1087
	mutex_lock(&local->iflist_mtx);
1088
	list_add_tail_rcu(&sdata->list, &local->interfaces);
1089
	mutex_unlock(&local->iflist_mtx);
1090

1091 1092 1093 1094 1095
	if (new_dev)
		*new_dev = ndev;

	return 0;

1096
 fail:
1097 1098 1099 1100
	free_netdev(ndev);
	return ret;
}

1101
void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1102 1103
{
	ASSERT_RTNL();
1104

1105
	mutex_lock(&sdata->local->iflist_mtx);
1106
	list_del_rcu(&sdata->list);
1107 1108
	mutex_unlock(&sdata->local->iflist_mtx);

1109
	synchronize_rcu();
1110
	unregister_netdevice(sdata->dev);
1111 1112
}

1113 1114 1115 1116 1117
/*
 * Remove all interfaces, may only be called at hardware unregistration
 * time because it doesn't do RCU-safe list removals.
 */
void ieee80211_remove_interfaces(struct ieee80211_local *local)
1118
{
1119
	struct ieee80211_sub_if_data *sdata, *tmp;
1120
	LIST_HEAD(unreg_list);
1121 1122 1123

	ASSERT_RTNL();

1124
	mutex_lock(&local->iflist_mtx);
1125 1126
	list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
		list_del(&sdata->list);
1127

1128
		unregister_netdevice_queue(sdata->dev, &unreg_list);
1129
	}
1130 1131
	mutex_unlock(&local->iflist_mtx);
	unregister_netdevice_many(&unreg_list);
1132
}
1133 1134 1135 1136 1137 1138 1139 1140

static u32 ieee80211_idle_off(struct ieee80211_local *local,
			      const char *reason)
{
	if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
		return 0;

#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches's avatar
Joe Perches committed
1141
	wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153
#endif

	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;

#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches's avatar
Joe Perches committed
1154
	wiphy_debug(local->hw.wiphy, "device now idle\n");
1155 1156
#endif

1157 1158
	drv_flush(local, false);