main.c 51.1 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 *
 * 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.
 */

#include <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/wireless.h>
#include <linux/rtnetlink.h>
#include <linux/bitmap.h>
24
#include <net/net_namespace.h>
25 26 27
#include <net/cfg80211.h>

#include "ieee80211_i.h"
Johannes Berg's avatar
Johannes Berg committed
28
#include "rate.h"
29
#include "mesh.h"
30 31 32
#include "wep.h"
#include "wme.h"
#include "aes_ccm.h"
Johannes Berg's avatar
Johannes Berg committed
33
#include "led.h"
34
#include "cfg.h"
35 36
#include "debugfs.h"
#include "debugfs_netdev.h"
37

38 39 40 41 42 43 44 45 46 47
/*
 * For seeing transmitted packets on monitor interfaces
 * we have a radiotap header too.
 */
struct ieee80211_tx_status_rtap_hdr {
	struct ieee80211_radiotap_header hdr;
	__le16 tx_flags;
	u8 data_retries;
} __attribute__ ((packed));

48
/* common interface routines */
49

50
static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
51 52 53 54
{
	memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
	return ETH_ALEN;
}
55

56 57 58 59 60 61
/* must be called under mdev tx lock */
static void ieee80211_configure_filter(struct ieee80211_local *local)
{
	unsigned int changed_flags;
	unsigned int new_flags = 0;

62
	if (atomic_read(&local->iff_promiscs))
63 64
		new_flags |= FIF_PROMISC_IN_BSS;

65
	if (atomic_read(&local->iff_allmultis))
66 67 68
		new_flags |= FIF_ALLMULTI;

	if (local->monitors)
69 70 71 72 73 74 75 76 77 78 79 80 81
		new_flags |= FIF_BCN_PRBRESP_PROMISC;

	if (local->fif_fcsfail)
		new_flags |= FIF_FCSFAIL;

	if (local->fif_plcpfail)
		new_flags |= FIF_PLCPFAIL;

	if (local->fif_control)
		new_flags |= FIF_CONTROL;

	if (local->fif_other_bss)
		new_flags |= FIF_OTHER_BSS;
82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97

	changed_flags = local->filter_flags ^ new_flags;

	/* be a bit nasty */
	new_flags |= (1<<31);

	local->ops->configure_filter(local_to_hw(local),
				     changed_flags, &new_flags,
				     local->mdev->mc_count,
				     local->mdev->mc_list);

	WARN_ON(new_flags & (1<<31));

	local->filter_flags = new_flags & ~(1<<31);
}

98
/* master interface */
99

100 101 102 103 104
static int ieee80211_master_open(struct net_device *dev)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata;
	int res = -EOPNOTSUPP;
105

106 107
	/* we hold the RTNL here so can safely walk the list */
	list_for_each_entry(sdata, &local->interfaces, list) {
108
		if (netif_running(sdata->dev)) {
109 110 111 112
			res = 0;
			break;
		}
	}
113 114 115 116 117 118 119

	if (res)
		return res;

	netif_start_queue(local->mdev);

	return 0;
120
}
121

122
static int ieee80211_master_stop(struct net_device *dev)
123
{
124 125
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata;
126

127 128
	/* we hold the RTNL here so can safely walk the list */
	list_for_each_entry(sdata, &local->interfaces, list)
129
		if (netif_running(sdata->dev))
130
			dev_close(sdata->dev);
131

132 133
	return 0;
}
134

135 136 137 138 139 140 141
static void ieee80211_master_set_multicast_list(struct net_device *dev)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);

	ieee80211_configure_filter(local);
}

142
/* regular interfaces */
143

144
static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
145
{
146 147 148 149 150
	int meshhdrlen;
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	meshhdrlen = (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) ? 5 : 0;

151 152
	/* FIX: what would be proper limits for MTU?
	 * This interface uses 802.3 frames. */
153
	if (new_mtu < 256 ||
154
	    new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
155 156
		return -EINVAL;
	}
157

158 159 160 161
#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;
162 163 164
	return 0;
}

165 166 167 168 169 170 171 172 173 174 175 176 177 178 179
static inline int identical_mac_addr_allowed(int type1, int type2)
{
	return (type1 == IEEE80211_IF_TYPE_MNTR ||
		type2 == IEEE80211_IF_TYPE_MNTR ||
		(type1 == IEEE80211_IF_TYPE_AP &&
		 type2 == IEEE80211_IF_TYPE_WDS) ||
		(type1 == IEEE80211_IF_TYPE_WDS &&
		 (type2 == IEEE80211_IF_TYPE_WDS ||
		  type2 == IEEE80211_IF_TYPE_AP)) ||
		(type1 == IEEE80211_IF_TYPE_AP &&
		 type2 == IEEE80211_IF_TYPE_VLAN) ||
		(type1 == IEEE80211_IF_TYPE_VLAN &&
		 (type2 == IEEE80211_IF_TYPE_AP ||
		  type2 == IEEE80211_IF_TYPE_VLAN)));
}
180

181
static int ieee80211_open(struct net_device *dev)
182
{
183 184
	struct ieee80211_sub_if_data *sdata, *nsdata;
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
185
	struct sta_info *sta;
186
	struct ieee80211_if_init_conf conf;
187
	u32 changed = 0;
188
	int res;
189
	bool need_hw_reconfig = 0;
190

191
	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
192

193 194
	/* we hold the RTNL here so can safely walk the list */
	list_for_each_entry(nsdata, &local->interfaces, list) {
195
		struct net_device *ndev = nsdata->dev;
196

197
		if (ndev != dev && netif_running(ndev)) {
198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218
			/*
			 * 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...
			 */
			if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
			    nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
				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;

219 220 221
			/*
			 * check whether it may have the same address
			 */
222 223
			if (!identical_mac_addr_allowed(sdata->vif.type,
							nsdata->vif.type))
224 225 226 227 228
				return -ENOTUNIQ;

			/*
			 * can only add VLANs to enabled APs
			 */
229
			if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
230
			    nsdata->vif.type == IEEE80211_IF_TYPE_AP)
231
				sdata->bss = &nsdata->u.ap;
232 233
		}
	}
234

235
	switch (sdata->vif.type) {
236
	case IEEE80211_IF_TYPE_WDS:
237
		if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
238 239 240
			return -ENOLINK;
		break;
	case IEEE80211_IF_TYPE_VLAN:
241
		if (!sdata->bss)
242
			return -ENOLINK;
243
		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
244
		break;
Johannes Berg's avatar
Johannes Berg committed
245
	case IEEE80211_IF_TYPE_AP:
246 247
		sdata->bss = &sdata->u.ap;
		break;
Johannes Berg's avatar
Johannes Berg committed
248 249 250
	case IEEE80211_IF_TYPE_STA:
	case IEEE80211_IF_TYPE_MNTR:
	case IEEE80211_IF_TYPE_IBSS:
251
	case IEEE80211_IF_TYPE_MESH_POINT:
Johannes Berg's avatar
Johannes Berg committed
252 253
		/* no special treatment */
		break;
254 255 256 257
	case IEEE80211_IF_TYPE_INVALID:
		/* cannot happen */
		WARN_ON(1);
		break;
258
	}
259

260 261
	if (local->open_count == 0) {
		res = 0;
262 263 264
		if (local->ops->start)
			res = local->ops->start(local_to_hw(local));
		if (res)
265
			goto err_del_bss;
266
		need_hw_reconfig = 1;
267
		ieee80211_led_radio(local, local->hw.conf.radio_enabled);
268
	}
269

270
	switch (sdata->vif.type) {
271 272 273
	case IEEE80211_IF_TYPE_VLAN:
		/* no need to tell driver */
		break;
274
	case IEEE80211_IF_TYPE_MNTR:
275 276 277 278 279
		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
			local->cooked_mntrs++;
			break;
		}

280
		/* must be before the call to ieee80211_configure_filter */
281
		local->monitors++;
282
		if (local->monitors == 1)
283
			local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
284 285 286 287 288 289 290 291 292 293 294 295 296

		if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
			local->fif_fcsfail++;
		if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
			local->fif_plcpfail++;
		if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
			local->fif_control++;
		if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
			local->fif_other_bss++;

		netif_tx_lock_bh(local->mdev);
		ieee80211_configure_filter(local);
		netif_tx_unlock_bh(local->mdev);
297 298 299 300 301 302
		break;
	case IEEE80211_IF_TYPE_STA:
	case IEEE80211_IF_TYPE_IBSS:
		sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
		/* fall through */
	default:
303
		conf.vif = &sdata->vif;
304
		conf.type = sdata->vif.type;
305 306 307
		conf.mac_addr = dev->dev_addr;
		res = local->ops->add_interface(local_to_hw(local), &conf);
		if (res)
308
			goto err_stop;
309

310
		ieee80211_if_config(dev);
311 312
		changed |= ieee80211_reset_erp_info(dev);
		ieee80211_bss_info_change_notify(sdata, changed);
313
		ieee80211_enable_keys(sdata);
314

315
		if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
316
		    !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
317 318 319
			netif_carrier_off(dev);
		else
			netif_carrier_on(dev);
320
	}
321

322 323 324 325 326 327 328 329 330
	if (sdata->vif.type == IEEE80211_IF_TYPE_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;
		}

331
		/* no locking required since STA is not live yet */
332 333 334 335 336 337 338 339 340
		sta->flags |= WLAN_STA_AUTHORIZED;

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

341 342 343
	if (local->open_count == 0) {
		res = dev_open(local->mdev);
		WARN_ON(res);
344 345
		if (res)
			goto err_del_interface;
346 347 348 349
		tasklet_enable(&local->tx_pending_tasklet);
		tasklet_enable(&local->tasklet);
	}

350 351 352 353 354 355 356 357 358 359 360
	/*
	 * 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);

361
	local->open_count++;
362 363
	if (need_hw_reconfig)
		ieee80211_hw_config(local);
364

365 366 367 368 369 370
	/*
	 * ieee80211_sta_work is disabled while network interface
	 * is down. Therefore, some configuration changes may not
	 * yet be effective. Trigger execution of ieee80211_sta_work
	 * to fix this.
	 */
Johannes Berg's avatar
Johannes Berg committed
371 372
	if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
	    sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
373 374 375 376
		struct ieee80211_if_sta *ifsta = &sdata->u.sta;
		queue_work(local->hw.workqueue, &ifsta->work);
	}

377
	netif_start_queue(dev);
378

379
	return 0;
380 381 382 383 384
 err_del_interface:
	local->ops->remove_interface(local_to_hw(local), &conf);
 err_stop:
	if (!local->open_count && local->ops->stop)
		local->ops->stop(local_to_hw(local));
385 386 387 388
 err_del_bss:
	sdata->bss = NULL;
	if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
		list_del(&sdata->u.vlan.list);
389
	return res;
390 391
}

392
static int ieee80211_stop(struct net_device *dev)
393
{
394 395
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
396
	struct ieee80211_if_init_conf conf;
397
	struct sta_info *sta;
398

399 400 401 402
	/*
	 * Stop TX on this interface first.
	 */
	netif_stop_queue(dev);
403

404 405 406
	/*
	 * Now delete all active aggregation sessions.
	 */
407 408 409 410
	rcu_read_lock();

	list_for_each_entry_rcu(sta, &local->sta_list, list) {
		if (sta->sdata == sdata)
411
			ieee80211_sta_tear_down_BA_sessions(dev, sta->addr);
412 413
	}

414 415
	rcu_read_unlock();

416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433
	/*
	 * 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!)
	 *
	 * We could relax this and only unlink the stations from the
	 * hash table and list but keep them on a per-sdata list that
	 * will be inserted back again when the interface is brought
	 * up again, but I don't currently see a use case for that,
	 * except with WDS which gets a STA entry created when it is
	 * brought up.
	 */
	sta_info_flush(local, sdata);
434

435 436 437 438 439 440 441 442 443 444 445 446
	/*
	 * 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);

447 448
	dev_mc_unsync(local->mdev, dev);

449
	/* APs need special treatment */
450
	if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
451
		struct ieee80211_sub_if_data *vlan, *tmp;
452
		struct beacon_data *old_beacon = sdata->u.ap.beacon;
453

454 455 456 457 458 459
		/* remove beacon */
		rcu_assign_pointer(sdata->u.ap.beacon, NULL);
		synchronize_rcu();
		kfree(old_beacon);

		/* down all dependent devices, that is VLANs */
460 461 462 463 464 465
		list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
					 u.vlan.list)
			dev_close(vlan->dev);
		WARN_ON(!list_empty(&sdata->u.ap.vlans));
	}

466
	local->open_count--;
467

468
	switch (sdata->vif.type) {
469 470 471 472
	case IEEE80211_IF_TYPE_VLAN:
		list_del(&sdata->u.vlan.list);
		/* no need to tell driver */
		break;
473
	case IEEE80211_IF_TYPE_MNTR:
474 475 476 477 478
		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
			local->cooked_mntrs--;
			break;
		}

479
		local->monitors--;
480
		if (local->monitors == 0)
481
			local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
482 483 484 485 486 487 488 489 490 491 492 493 494

		if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
			local->fif_fcsfail--;
		if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
			local->fif_plcpfail--;
		if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
			local->fif_control--;
		if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
			local->fif_other_bss--;

		netif_tx_lock_bh(local->mdev);
		ieee80211_configure_filter(local);
		netif_tx_unlock_bh(local->mdev);
495
		break;
496
	case IEEE80211_IF_TYPE_MESH_POINT:
497 498 499
	case IEEE80211_IF_TYPE_STA:
	case IEEE80211_IF_TYPE_IBSS:
		sdata->u.sta.state = IEEE80211_DISABLED;
500
		memset(sdata->u.sta.bssid, 0, ETH_ALEN);
501
		del_timer_sync(&sdata->u.sta.timer);
502
		/*
503 504 505 506
		 * 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.
507
		 */
508
		synchronize_rcu();
509
		skb_queue_purge(&sdata->u.sta.skb_queue);
510

Zhu Yi's avatar
Zhu Yi committed
511 512 513 514 515 516
		if (local->scan_dev == sdata->dev) {
			if (!local->ops->hw_scan) {
				local->sta_sw_scanning = 0;
				cancel_delayed_work(&local->scan_work);
			} else
				local->sta_hw_scanning = 0;
517
		}
Zhu Yi's avatar
Zhu Yi committed
518

519 520 521 522
		sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
		kfree(sdata->u.sta.extra_ie);
		sdata->u.sta.extra_ie = NULL;
		sdata->u.sta.extra_ie_len = 0;
523 524
		/* fall through */
	default:
525
		conf.vif = &sdata->vif;
526
		conf.type = sdata->vif.type;
527
		conf.mac_addr = dev->dev_addr;
528 529
		/* disable all keys for as long as this netdev is down */
		ieee80211_disable_keys(sdata);
530
		local->ops->remove_interface(local_to_hw(local), &conf);
531 532
	}

533 534
	sdata->bss = NULL;

535 536 537
	if (local->open_count == 0) {
		if (netif_running(local->mdev))
			dev_close(local->mdev);
538

539 540
		if (local->ops->stop)
			local->ops->stop(local_to_hw(local));
541

542 543
		ieee80211_led_radio(local, 0);

544 545
		flush_workqueue(local->hw.workqueue);

546 547 548 549
		tasklet_disable(&local->tx_pending_tasklet);
		tasklet_disable(&local->tasklet);
	}

550 551 552
	return 0;
}

553 554 555
int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
{
	struct ieee80211_local *local = hw_to_local(hw);
556
	struct netdev_queue *txq;
557 558 559 560 561 562 563 564 565 566 567 568 569 570 571
	struct sta_info *sta;
	struct ieee80211_sub_if_data *sdata;
	u16 start_seq_num = 0;
	u8 *state;
	int ret;
	DECLARE_MAC_BUF(mac);

	if (tid >= STA_TID_NUM)
		return -EINVAL;

#ifdef CONFIG_MAC80211_HT_DEBUG
	printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
				print_mac(mac, ra), tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */

572 573
	rcu_read_lock();

574 575
	sta = sta_info_get(local, ra);
	if (!sta) {
576
#ifdef CONFIG_MAC80211_HT_DEBUG
577
		printk(KERN_DEBUG "Could not find the station\n");
578
#endif
579 580
		ret = -ENOENT;
		goto exit;
581 582
	}

583
	spin_lock_bh(&sta->lock);
584 585

	/* we have tried too many times, receiver does not want A-MPDU */
586
	if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
587
		ret = -EBUSY;
588
		goto err_unlock_sta;
589 590
	}

591
	state = &sta->ampdu_mlme.tid_state_tx[tid];
592 593 594 595 596 597 598
	/* check if the TID is not in aggregation flow already */
	if (*state != HT_AGG_STATE_IDLE) {
#ifdef CONFIG_MAC80211_HT_DEBUG
		printk(KERN_DEBUG "BA request denied - session is not "
				 "idle on tid %u\n", tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */
		ret = -EAGAIN;
599
		goto err_unlock_sta;
600 601
	}

602 603 604 605
	/* prepare A-MPDU MLME for Tx aggregation */
	sta->ampdu_mlme.tid_tx[tid] =
			kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
	if (!sta->ampdu_mlme.tid_tx[tid]) {
606
#ifdef CONFIG_MAC80211_HT_DEBUG
607 608 609
		if (net_ratelimit())
			printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
					tid);
610
#endif
611
		ret = -ENOMEM;
612
		goto err_unlock_sta;
613 614 615 616 617 618 619 620
	}
	/* Tx timer */
	sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
			sta_addba_resp_timer_expired;
	sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
			(unsigned long)&sta->timer_to_tid[tid];
	init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);

621 622
	/* ensure that TX flow won't interrupt us
	 * until the end of the call to requeue function */
623 624
	txq = &local->mdev->tx_queue;
	spin_lock_bh(&txq->lock);
625 626

	/* create a new queue for this aggregation */
627
	ret = ieee80211_ht_agg_queue_add(local, sta, tid);
628 629 630 631 632

	/* case no queue is available to aggregation
	 * don't switch to aggregation */
	if (ret) {
#ifdef CONFIG_MAC80211_HT_DEBUG
633
		printk(KERN_DEBUG "BA request denied - queue unavailable for"
634 635
					" tid %d\n", tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */
636
		goto err_unlock_queue;
637
	}
638
	sdata = sta->sdata;
639 640 641 642 643 644 645 646 647 648 649 650 651

	/* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
	 * call back right away, it must see that the flow has begun */
	*state |= HT_ADDBA_REQUESTED_MSK;

	if (local->ops->ampdu_action)
		ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
						ra, tid, &start_seq_num);

	if (ret) {
		/* No need to requeue the packets in the agg queue, since we
		 * held the tx lock: no packet could be enqueued to the newly
		 * allocated queue */
652
		 ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
653
#ifdef CONFIG_MAC80211_HT_DEBUG
654 655
		printk(KERN_DEBUG "BA request denied - HW unavailable for"
					" tid %d\n", tid);
656 657
#endif /* CONFIG_MAC80211_HT_DEBUG */
		*state = HT_AGG_STATE_IDLE;
658
		goto err_unlock_queue;
659 660 661
	}

	/* Will put all the packets in the new SW queue */
662
	ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
663
	spin_unlock_bh(&txq->lock);
664
	spin_unlock_bh(&sta->lock);
665 666 667

	/* send an addBA request */
	sta->ampdu_mlme.dialog_token_allocator++;
668
	sta->ampdu_mlme.tid_tx[tid]->dialog_token =
669
			sta->ampdu_mlme.dialog_token_allocator;
670
	sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
671

672

673
	ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
674 675
			 sta->ampdu_mlme.tid_tx[tid]->dialog_token,
			 sta->ampdu_mlme.tid_tx[tid]->ssn,
676 677
			 0x40, 5000);
	/* activate the timer for the recipient's addBA response */
678
	sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
679
				jiffies + ADDBA_RESP_INTERVAL;
680
	add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
681
#ifdef CONFIG_MAC80211_HT_DEBUG
682
	printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
683
#endif
684
	goto exit;
685

686
err_unlock_queue:
687 688
	kfree(sta->ampdu_mlme.tid_tx[tid]);
	sta->ampdu_mlme.tid_tx[tid] = NULL;
689
	spin_unlock_bh(&txq->lock);
690
	ret = -EBUSY;
691
err_unlock_sta:
692
	spin_unlock_bh(&sta->lock);
693
exit:
694
	rcu_read_unlock();
695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711
	return ret;
}
EXPORT_SYMBOL(ieee80211_start_tx_ba_session);

int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
				 u8 *ra, u16 tid,
				 enum ieee80211_back_parties initiator)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct sta_info *sta;
	u8 *state;
	int ret = 0;
	DECLARE_MAC_BUF(mac);

	if (tid >= STA_TID_NUM)
		return -EINVAL;

712
	rcu_read_lock();
713
	sta = sta_info_get(local, ra);
714 715
	if (!sta) {
		rcu_read_unlock();
716
		return -ENOENT;
717
	}
718 719

	/* check if the TID is in aggregation */
720
	state = &sta->ampdu_mlme.tid_state_tx[tid];
721
	spin_lock_bh(&sta->lock);
722 723 724 725 726 727

	if (*state != HT_AGG_STATE_OPERATIONAL) {
		ret = -ENOENT;
		goto stop_BA_exit;
	}

728 729 730 731 732
#ifdef CONFIG_MAC80211_HT_DEBUG
	printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
				print_mac(mac, ra), tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */

733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750
	ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);

	*state = HT_AGG_STATE_REQ_STOP_BA_MSK |
		(initiator << HT_AGG_STATE_INITIATOR_SHIFT);

	if (local->ops->ampdu_action)
		ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
						ra, tid, NULL);

	/* case HW denied going back to legacy */
	if (ret) {
		WARN_ON(ret != -EBUSY);
		*state = HT_AGG_STATE_OPERATIONAL;
		ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
		goto stop_BA_exit;
	}

stop_BA_exit:
751
	spin_unlock_bh(&sta->lock);
752
	rcu_read_unlock();
753 754 755 756 757 758 759 760 761 762 763 764
	return ret;
}
EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);

void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct sta_info *sta;
	u8 *state;
	DECLARE_MAC_BUF(mac);

	if (tid >= STA_TID_NUM) {
765
#ifdef CONFIG_MAC80211_HT_DEBUG
766 767
		printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
				tid, STA_TID_NUM);
768
#endif
769 770 771
		return;
	}

772
	rcu_read_lock();
773 774
	sta = sta_info_get(local, ra);
	if (!sta) {
775
		rcu_read_unlock();
776
#ifdef CONFIG_MAC80211_HT_DEBUG
777 778
		printk(KERN_DEBUG "Could not find station: %s\n",
				print_mac(mac, ra));
779
#endif
780 781 782
		return;
	}

783
	state = &sta->ampdu_mlme.tid_state_tx[tid];
784
	spin_lock_bh(&sta->lock);
785 786

	if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
787
#ifdef CONFIG_MAC80211_HT_DEBUG
788 789
		printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
				*state);
790
#endif
791
		spin_unlock_bh(&sta->lock);
792
		rcu_read_unlock();
793 794 795 796 797 798 799 800
		return;
	}

	WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);

	*state |= HT_ADDBA_DRV_READY_MSK;

	if (*state == HT_AGG_STATE_OPERATIONAL) {
801
#ifdef CONFIG_MAC80211_HT_DEBUG
802
		printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
803
#endif
804 805
		ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
	}
806
	spin_unlock_bh(&sta->lock);
807
	rcu_read_unlock();
808 809 810 811 812 813
}
EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);

void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
{
	struct ieee80211_local *local = hw_to_local(hw);
814
	struct netdev_queue *txq;
815 816 817 818 819 820
	struct sta_info *sta;
	u8 *state;
	int agg_queue;
	DECLARE_MAC_BUF(mac);

	if (tid >= STA_TID_NUM) {
821
#ifdef CONFIG_MAC80211_HT_DEBUG
822 823
		printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
				tid, STA_TID_NUM);
824
#endif
825 826 827
		return;
	}

828 829
#ifdef CONFIG_MAC80211_HT_DEBUG
	printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
830
				print_mac(mac, ra), tid);
831
#endif /* CONFIG_MAC80211_HT_DEBUG */
832

833
	rcu_read_lock();
834 835
	sta = sta_info_get(local, ra);
	if (!sta) {
836
#ifdef CONFIG_MAC80211_HT_DEBUG
837 838
		printk(KERN_DEBUG "Could not find station: %s\n",
				print_mac(mac, ra));
839
#endif
840
		rcu_read_unlock();
841 842
		return;
	}
843
	state = &sta->ampdu_mlme.tid_state_tx[tid];
844

845 846 847
	/* NOTE: no need to use sta->lock in this state check, as
	 * ieee80211_stop_tx_ba_session will let only
	 * one stop call to pass through per sta/tid */
848
	if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
849
#ifdef CONFIG_MAC80211_HT_DEBUG
850
		printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
851
#endif
852
		rcu_read_unlock();
853 854 855 856
		return;
	}

	if (*state & HT_AGG_STATE_INITIATOR_MSK)
857
		ieee80211_send_delba(sta->sdata->dev, ra, tid,
858 859 860 861 862 863
			WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);

	agg_queue = sta->tid_to_tx_q[tid];

	/* avoid ordering issues: we are the only one that can modify
	 * the content of the qdiscs */
864 865
	txq = &local->mdev->tx_queue;
	spin_lock_bh(&txq->lock);
866
	/* remove the queue for this aggregation */
867
	ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
868
	spin_unlock_bh(&txq->lock);
869 870

	/* we just requeued the all the frames that were in the removed
871
	 * queue, and since we might miss a softirq we do netif_schedule_queue.
872 873
	 * ieee80211_wake_queue is not used here as this queue is not
	 * necessarily stopped */
874
	netif_schedule_queue(txq);
875
	spin_lock_bh(&sta->lock);
876
	*state = HT_AGG_STATE_IDLE;
877 878 879
	sta->ampdu_mlme.addba_req_num[tid] = 0;
	kfree(sta->ampdu_mlme.tid_tx[tid]);
	sta->ampdu_mlme.tid_tx[tid] = NULL;
880
	spin_unlock_bh(&sta->lock);
881

882
	rcu_read_unlock();
883 884 885 886 887 888 889 890 891 892 893
}
EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);

void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
				      const u8 *ra, u16 tid)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_ra_tid *ra_tid;
	struct sk_buff *skb = dev_alloc_skb(0);

	if (unlikely(!skb)) {
894
#ifdef CONFIG_MAC80211_HT_DEBUG
895 896 897
		if (net_ratelimit())
			printk(KERN_WARNING "%s: Not enough memory, "
			       "dropping start BA session", skb->dev->name);
898
#endif
899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918
		return;
	}
	ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
	memcpy(&ra_tid->ra, ra, ETH_ALEN);
	ra_tid->tid = tid;

	skb->pkt_type = IEEE80211_ADDBA_MSG;
	skb_queue_tail(&local->skb_queue, skb);
	tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);

void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
				     const u8 *ra, u16 tid)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_ra_tid *ra_tid;
	struct sk_buff *skb = dev_alloc_skb(0);

	if (unlikely(!skb)) {
919
#ifdef CONFIG_MAC80211_HT_DEBUG
920 921 922
		if (net_ratelimit())
			printk(KERN_WARNING "%s: Not enough memory, "
			       "dropping stop BA session", skb->dev->name);
923
#endif
924 925 926 927 928 929 930 931 932 933 934 935
		return;
	}
	ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
	memcpy(&ra_tid->ra, ra, ETH_ALEN);
	ra_tid->tid = tid;

	skb->pkt_type = IEEE80211_DELBA_MSG;
	skb_queue_tail(&local->skb_queue, skb);
	tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);

936 937 938 939
static void ieee80211_set_multicast_list(struct net_device *dev)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
940
	int allmulti, promisc, sdata_allmulti, sdata_promisc;
941

942 943
	allmulti = !!(dev->flags & IFF_ALLMULTI);
	promisc = !!(dev->flags & IFF_PROMISC);
944 945
	sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
	sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
946 947 948

	if (allmulti != sdata_allmulti) {
		if (dev->flags & IFF_ALLMULTI)
949
			atomic_inc(&local->iff_allmultis);
950
		else
951
			atomic_dec(&local->iff_allmultis);
952
		sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
953
	}
954 955 956

	if (promisc != sdata_promisc) {
		if (dev->flags & IFF_PROMISC)
957
			atomic_inc(&local->iff_promiscs);
958
		else
959
			atomic_dec(&local->iff_promiscs);
960
		sdata->flags ^= IEEE80211_SDATA_PROMISC;
961
	}
962 963

	dev_mc_sync(local->mdev, dev);
964 965
}

966 967 968 969 970 971 972 973
static const struct header_ops ieee80211_header_ops = {
	.create		= eth_header,
	.parse		= header_parse_80211,
	.rebuild	= eth_rebuild_header,
	.cache		= eth_header_cache,
	.cache_update	= eth_header_cache_update,
};

974
void ieee80211_if_setup(struct net_device *dev)
975
{
976 977 978 979 980