iface.c 43.5 KB
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/*
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 * Interface handling (except master interface)
 *
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 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
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 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
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 *
 * 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.
 */
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#include <linux/slab.h>
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#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <net/mac80211.h>
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#include <net/ieee80211_radiotap.h>
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#include "ieee80211_i.h"
#include "sta_info.h"
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#include "debugfs_netdev.h"
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#include "mesh.h"
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#include "led.h"
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#include "driver-ops.h"
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#include "wme.h"
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#include "rate.h"
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/**
 * 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.
 */

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bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_chanctx_conf *chanctx_conf;
	int power;

	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
		return false;
	}

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	power = chanctx_conf->def.chan->max_power;
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	rcu_read_unlock();

	if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
		power = min(power, sdata->user_power_level);

	if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
		power = min(power, sdata->ap_power_level);

	if (power != sdata->vif.bss_conf.txpower) {
		sdata->vif.bss_conf.txpower = power;
		ieee80211_hw_config(sdata->local, 0);
		return true;
	}

	return false;
}

void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
{
	if (__ieee80211_recalc_txpower(sdata))
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
}
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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;
		}
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		if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
			continue;

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		/* 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;
		}
	}

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	sdata = rcu_dereference_protected(local->scan_sdata,
					  lockdep_is_held(&local->mtx));
	if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
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		scanning = true;
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		sdata->vif.bss_conf.idle = false;
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	}

	list_for_each_entry(sdata, &local->interfaces, list) {
		if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
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		    sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
		    sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
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			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);
}

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static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
{
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	if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
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		return -EINVAL;

	dev->mtu = new_mtu;
	return 0;
}

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static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
{
	struct ieee80211_sub_if_data *sdata;
	u64 new, mask, tmp;
	u8 *m;
	int ret = 0;

	if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
		return 0;

	m = addr;
	new =	((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);

	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);


	mutex_lock(&local->iflist_mtx);
	list_for_each_entry(sdata, &local->interfaces, list) {
		if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
			continue;

		m = sdata->vif.addr;
		tmp =	((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 ((new & ~mask) != (tmp & ~mask)) {
			ret = -EINVAL;
			break;
		}
	}
	mutex_unlock(&local->iflist_mtx);

	return ret;
}

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static int ieee80211_change_mac(struct net_device *dev, void *addr)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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	struct sockaddr *sa = addr;
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	int ret;

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	if (ieee80211_sdata_running(sdata))
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		return -EBUSY;

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	ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
	if (ret)
		return ret;

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	ret = eth_mac_addr(dev, sa);
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	if (ret == 0)
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		memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
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	return ret;
}

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static inline int identical_mac_addr_allowed(int type1, int type2)
{
	return type1 == NL80211_IFTYPE_MONITOR ||
		type2 == NL80211_IFTYPE_MONITOR ||
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		type1 == NL80211_IFTYPE_P2P_DEVICE ||
		type2 == NL80211_IFTYPE_P2P_DEVICE ||
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		(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));
}

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static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
					    enum nl80211_iftype iftype)
297
{
298
	struct ieee80211_local *local = sdata->local;
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	struct ieee80211_sub_if_data *nsdata;
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301
	ASSERT_RTNL();
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	/* we hold the RTNL here so can safely walk the list */
	list_for_each_entry(nsdata, &local->interfaces, list) {
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		if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
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			/*
			 * 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...
			 */
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			if (iftype == NL80211_IFTYPE_ADHOC &&
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			    nsdata->vif.type == NL80211_IFTYPE_ADHOC)
				return -EBUSY;

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

			/*
			 * check whether it may have the same address
			 */
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			if (!identical_mac_addr_allowed(iftype,
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							nsdata->vif.type))
				return -ENOTUNIQ;

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

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	return 0;
}

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static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
{
	int n_queues = sdata->local->hw.queues;
	int i;

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	if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
		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;
		}
361 362
	}

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	if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
	    !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
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		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;
}

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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
}

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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;
406
		else if (local->hw.queues >= IEEE80211_NUM_ACS)
407
			sdata->vif.hw_queue[i] = i;
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		else
			sdata->vif.hw_queue[i] = 0;
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	}
	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
}

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static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
415 416
{
	struct ieee80211_sub_if_data *sdata;
417
	int ret = 0;
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	if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
		return 0;

422 423
	mutex_lock(&local->iflist_mtx);

424
	if (local->monitor_sdata)
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		goto out_unlock;
426 427

	sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
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	if (!sdata) {
		ret = -ENOMEM;
		goto out_unlock;
	}
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	/* set up data */
	sdata->local = local;
	sdata->vif.type = NL80211_IFTYPE_MONITOR;
	snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
		 wiphy_name(local->hw.wiphy));

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	ieee80211_set_default_queues(sdata);

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	ret = drv_add_interface(local, sdata);
	if (WARN_ON(ret)) {
		/* ok .. stupid driver, it asked for this! */
		kfree(sdata);
445
		goto out_unlock;
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	}

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	ret = ieee80211_check_queues(sdata);
	if (ret) {
		kfree(sdata);
451
		goto out_unlock;
452 453
	}

454
	ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
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					IEEE80211_CHANCTX_EXCLUSIVE);
	if (ret) {
		drv_remove_interface(local, sdata);
		kfree(sdata);
		goto out_unlock;
	}

462
	rcu_assign_pointer(local->monitor_sdata, sdata);
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 out_unlock:
	mutex_unlock(&local->iflist_mtx);
	return ret;
466 467
}

468
static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
469 470 471 472 473 474
{
	struct ieee80211_sub_if_data *sdata;

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

475
	mutex_lock(&local->iflist_mtx);
476

477 478
	sdata = rcu_dereference_protected(local->monitor_sdata,
					  lockdep_is_held(&local->iflist_mtx));
479
	if (!sdata)
480
		goto out_unlock;
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	rcu_assign_pointer(local->monitor_sdata, NULL);
	synchronize_net();

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	ieee80211_vif_release_channel(sdata);

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	drv_remove_interface(local, sdata);

	kfree(sdata);
490 491
 out_unlock:
	mutex_unlock(&local->iflist_mtx);
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}

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/*
 * 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.
 */
499
int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
500
{
501 502
	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
	struct net_device *dev = wdev->netdev;
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	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
	u32 changed = 0;
	int res;
	u32 hw_reconf_flags = 0;

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	switch (sdata->vif.type) {
	case NL80211_IFTYPE_WDS:
		if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
			return -ENOLINK;
		break;
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	case NL80211_IFTYPE_AP_VLAN: {
		struct ieee80211_sub_if_data *master;

517 518
		if (!sdata->bss)
			return -ENOLINK;
519

520
		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
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		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;
528
		break;
529
		}
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	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:
537
	case NL80211_IFTYPE_P2P_DEVICE:
538 539 540
		/* no special treatment */
		break;
	case NL80211_IFTYPE_UNSPECIFIED:
541
	case NUM_NL80211_IFTYPES:
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	case NL80211_IFTYPE_P2P_CLIENT:
	case NL80211_IFTYPE_P2P_GO:
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		/* cannot happen */
		WARN_ON(1);
		break;
	}

	if (local->open_count == 0) {
550
		res = drv_start(local);
551 552
		if (res)
			goto err_del_bss;
553 554
		if (local->ops->napi_poll)
			napi_enable(&local->napi);
555 556
		/* we're brought up, everything changes */
		hw_reconf_flags = ~0;
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		ieee80211_led_radio(local, true);
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		ieee80211_mod_tpt_led_trig(local,
					   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
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	}

	/*
563 564
	 * Copy the hopefully now-present MAC address to
	 * this interface, if it has the special null one.
565
	 */
566
	if (dev && is_zero_ether_addr(dev->dev_addr)) {
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		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)) {
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			res = -EADDRNOTAVAIL;
			goto err_stop;
575
		}
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	}

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_AP_VLAN:
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		/* no need to tell driver, but set carrier and chanctx */
		if (rtnl_dereference(sdata->bss->beacon)) {
			ieee80211_vif_vlan_copy_chanctx(sdata);
583
			netif_carrier_on(dev);
584
		} else {
585
			netif_carrier_off(dev);
586
		}
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		break;
	case NL80211_IFTYPE_MONITOR:
		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
			local->cooked_mntrs++;
			break;
		}

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		if (local->monitors == 0 && local->open_count == 0) {
			res = ieee80211_add_virtual_monitor(local);
			if (res)
				goto err_stop;
		}

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		/* must be before the call to ieee80211_configure_filter */
		local->monitors++;
602
		if (local->monitors == 1) {
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			local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
605
		}
606

607
		ieee80211_adjust_monitor_flags(sdata, 1);
608
		ieee80211_configure_filter(local);
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		netif_carrier_on(dev);
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		break;
	default:
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		if (coming_up) {
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			ieee80211_del_virtual_monitor(local);

616
			res = drv_add_interface(local, sdata);
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			if (res)
				goto err_stop;
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			res = ieee80211_check_queues(sdata);
			if (res)
				goto err_del_interface;
622
		}
623

624
		if (sdata->vif.type == NL80211_IFTYPE_AP) {
I
Igor Perminov 已提交
625
			local->fif_pspoll++;
626
			local->fif_probe_req++;
I
Igor Perminov 已提交
627 628

			ieee80211_configure_filter(local);
629 630
		} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
			local->fif_probe_req++;
631
		}
I
Igor Perminov 已提交
632

633 634
		if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
			changed |= ieee80211_reset_erp_info(sdata);
635 636
		ieee80211_bss_info_change_notify(sdata, changed);

637 638 639 640 641
		switch (sdata->vif.type) {
		case NL80211_IFTYPE_STATION:
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_MESH_POINT:
642
			netif_carrier_off(dev);
643
			break;
644
		case NL80211_IFTYPE_WDS:
645
		case NL80211_IFTYPE_P2P_DEVICE:
646
			break;
647
		default:
648
			netif_carrier_on(dev);
649
		}
650 651 652 653 654 655

		/*
		 * set default queue parameters so drivers don't
		 * need to initialise the hardware if the hardware
		 * doesn't start up with sane defaults
		 */
656
		ieee80211_set_wmm_default(sdata, true);
657 658
	}

659 660
	set_bit(SDATA_STATE_RUNNING, &sdata->state);

661 662 663 664 665 666 667 668 669
	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;
		}

670 671 672
		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);
673 674 675 676 677 678

		res = sta_info_insert(sta);
		if (res) {
			/* STA has been freed */
			goto err_del_interface;
		}
B
Bill Jordan 已提交
679 680

		rate_control_rate_init(sta);
681
		netif_carrier_on(dev);
682 683
	} else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
		rcu_assign_pointer(local->p2p_sdata, sdata);
684 685 686 687 688 689 690 691 692 693 694 695 696
	}

	/*
	 * 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);

697
	mutex_lock(&local->mtx);
J
Johannes Berg 已提交
698
	hw_reconf_flags |= __ieee80211_recalc_idle(local);
699
	mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
700

701 702 703
	if (coming_up)
		local->open_count++;

704
	if (hw_reconf_flags)
705
		ieee80211_hw_config(local, hw_reconf_flags);
706

707
	ieee80211_recalc_ps(local, -1);
708

709 710
	if (dev)
		netif_tx_start_all_queues(dev);
711 712 713

	return 0;
 err_del_interface:
714
	drv_remove_interface(local, sdata);
715
 err_stop:
716 717
	if (!local->open_count)
		drv_stop(local);
718 719 720 721
 err_del_bss:
	sdata->bss = NULL;
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
		list_del(&sdata->u.vlan.list);
722
	/* might already be clear but that doesn't matter */
723
	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
724 725 726
	return res;
}

727
static int ieee80211_open(struct net_device *dev)
728 729
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
730 731 732
	int err;

	/* fail early if user set an invalid address */
733
	if (!is_valid_ether_addr(dev->dev_addr))
734 735 736 737 738 739
		return -EADDRNOTAVAIL;

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

740
	return ieee80211_do_open(&sdata->wdev, true);
741 742 743 744 745
}

static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
			      bool going_down)
{
746
	struct ieee80211_local *local = sdata->local;
747 748
	unsigned long flags;
	struct sk_buff *skb, *tmp;
749
	u32 hw_reconf_flags = 0;
750
	int i, flushed;
751

752 753
	clear_bit(SDATA_STATE_RUNNING, &sdata->state);

754
	if (rcu_access_pointer(local->scan_sdata) == sdata)
755 756
		ieee80211_scan_cancel(local);

757 758 759
	/*
	 * Stop TX on this interface first.
	 */
760 761
	if (sdata->dev)
		netif_tx_stop_all_queues(sdata->dev);
762

763
	ieee80211_roc_purge(sdata);
J
Johannes Berg 已提交
764

765 766 767 768 769 770 771 772 773 774
	/*
	 * 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!)
	 *
775 776 777
	 * This is relevant only in WDS mode, in all other modes we've
	 * already removed all stations when disconnecting or similar,
	 * so warn otherwise.
778 779
	 *
	 * We call sta_info_flush_cleanup() later, to combine RCU waits.
780
	 */
781
	flushed = sta_info_flush_defer(sdata);
782 783
	WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
		     (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
784 785 786 787 788 789 790 791 792 793 794 795 796

	/*
	 * 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);

797
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
I
Igor Perminov 已提交
798
		local->fif_pspoll--;
799 800 801 802
		local->fif_probe_req--;
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
		local->fif_probe_req--;
	}
I
Igor Perminov 已提交
803

804 805 806 807 808 809 810
	if (sdata->dev) {
		netif_addr_lock_bh(sdata->dev);
		spin_lock_bh(&local->filter_lock);
		__hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
				 sdata->dev->addr_len);
		spin_unlock_bh(&local->filter_lock);
		netif_addr_unlock_bh(sdata->dev);
J
Johannes Berg 已提交
811

812 813
		ieee80211_configure_filter(local);
	}
814

815 816
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);
817

818 819
	cancel_work_sync(&sdata->recalc_smps);

820 821
	/* APs need special treatment */
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
822
		struct ieee80211_sub_if_data *vlan, *tmpsdata;
823 824

		/* down all dependent devices, that is VLANs */
825
		list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
826 827 828
					 u.vlan.list)
			dev_close(vlan->dev);
		WARN_ON(!list_empty(&sdata->u.ap.vlans));
829 830
	} else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
		ieee80211_mgd_stop(sdata);
831 832
	}

833 834
	if (going_down)
		local->open_count--;
835 836 837 838

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_AP_VLAN:
		list_del(&sdata->u.vlan.list);
839
		rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
840 841 842 843 844 845 846 847 848
		/* 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--;
849
		if (local->monitors == 0) {
J
Johannes Berg 已提交
850 851
			local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
852
			ieee80211_del_virtual_monitor(local);
853
		}
854

855
		ieee80211_adjust_monitor_flags(sdata, -1);
856 857
		ieee80211_configure_filter(local);
		break;
858 859 860 861
	case NL80211_IFTYPE_P2P_DEVICE:
		/* relies on synchronize_rcu() below */
		rcu_assign_pointer(local->p2p_sdata, NULL);
		/* fall through */
862
	default:
863
		cancel_work_sync(&sdata->work);
J
Johannes Berg 已提交
864 865
		/*
		 * When we get here, the interface is marked down.
866 867 868 869 870
		 * sta_info_flush_cleanup() calls rcu_barrier to
		 * wait for the station call_rcu() calls to complete,
		 * here we require it to wait for the RX path in case
		 * it is using the interface and enqueuing frames at
		 * this very time on another CPU.
J
Johannes Berg 已提交
871
		 */
872 873
		sta_info_flush_cleanup(sdata);

J
Johannes Berg 已提交
874 875
		skb_queue_purge(&sdata->skb_queue);

876 877 878 879
		/*
		 * Free all remaining keys, there shouldn't be any,
		 * except maybe group keys in AP more or WDS?
		 */
J
Johannes Berg 已提交
880
		ieee80211_free_keys(sdata);
881

882
		if (going_down)
883
			drv_remove_interface(local, sdata);
884 885 886 887
	}

	sdata->bss = NULL;

888
	mutex_lock(&local->mtx);
J
Johannes Berg 已提交
889
	hw_reconf_flags |= __ieee80211_recalc_idle(local);
890
	mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
891 892 893

	ieee80211_recalc_ps(local, -1);

894
	if (local->open_count == 0) {
895 896
		if (local->ops->napi_poll)
			napi_disable(&local->napi);
897
		ieee80211_clear_tx_pending(local);
898
		ieee80211_stop_device(local);
899

900 901
		/* no reconfiguring after stop! */
		hw_reconf_flags = 0;
902 903
	}

904
	/* do after stop to avoid reconfiguring when we stop anyway */
J
Johannes Berg 已提交
905
	if (hw_reconf_flags)
906 907
		ieee80211_hw_config(local, hw_reconf_flags);

908 909 910 911 912 913
	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]);
914
				ieee80211_free_txskb(&local->hw, skb);
915 916 917 918
			}
		}
	}
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
919 920 921

	if (local->monitors == local->open_count && local->monitors > 0)
		ieee80211_add_virtual_monitor(local);
922 923 924 925 926 927 928
}

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);
929

930 931 932 933 934 935
	return 0;
}

static void ieee80211_set_multicast_list(struct net_device *dev)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
936
	struct ieee80211_local *local = sdata->local;
937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958
	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;
	}
J
Johannes Berg 已提交
959
	spin_lock_bh(&local->filter_lock);
960
	__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
J
Johannes Berg 已提交
961
	spin_unlock_bh(&local->filter_lock);
962
	ieee80211_queue_work(&local->hw, &local->reconfig_filter);
963 964
}

965 966 967 968
/*
 * Called when the netdev is removed or, by the code below, before
 * the interface type changes.
 */
969
static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
970
{
971
	int flushed;
972 973
	int i;

974 975 976
	/* free extra data */
	ieee80211_free_keys(sdata);

977 978
	ieee80211_debugfs_remove_netdev(sdata);

979
	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
980 981
		__skb_queue_purge(&sdata->fragments[i].skb_list);
	sdata->fragment_next = 0;
J
Johannes Berg 已提交
982

983 984
	if (ieee80211_vif_is_mesh(&sdata->vif))
		mesh_rmc_free(sdata);
985

986
	flushed = sta_info_flush(sdata);
987
	WARN_ON(flushed);
988 989
}

990 991 992 993 994
static void ieee80211_uninit(struct net_device *dev)
{
	ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
}

995 996 997 998 999 1000
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);
}

1001 1002 1003
static const struct net_device_ops ieee80211_dataif_ops = {
	.ndo_open		= ieee80211_open,
	.ndo_stop		= ieee80211_stop,
1004
	.ndo_uninit		= ieee80211_uninit,
1005
	.ndo_start_xmit		= ieee80211_subif_start_xmit,
1006
	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
1007
	.ndo_change_mtu 	= ieee80211_change_mtu,
1008
	.ndo_set_mac_address 	= ieee80211_change_mac,
1009
	.ndo_select_queue	= ieee80211_netdev_select_queue,
1010 1011
};

1012 1013 1014 1015 1016 1017 1018 1019
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;

J
Johannes Berg 已提交
1020
	if (local->hw.queues < IEEE80211_NUM_ACS)
1021 1022 1023
		return 0;

	if (skb->len < 4 ||
J
Johannes Berg 已提交
1024
	    skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1025 1026
		return 0; /* doesn't matter, frame will be dropped */

J
Johannes Berg 已提交
1027
	hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1028

Y
Yoni Divinsky 已提交
1029
	return ieee80211_select_queue_80211(sdata, skb, hdr);
1030 1031
}

1032 1033 1034
static const struct net_device_ops ieee80211_monitorif_ops = {
	.ndo_open		= ieee80211_open,
	.ndo_stop		= ieee80211_stop,
1035
	.ndo_uninit		= ieee80211_uninit,
1036
	.ndo_start_xmit		= ieee80211_monitor_start_xmit,
1037
	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
1038 1039
	.ndo_change_mtu 	= ieee80211_change_mtu,
	.ndo_set_mac_address 	= eth_mac_addr,
1040
	.ndo_select_queue	= ieee80211_monitor_select_queue,
1041 1042 1043 1044 1045
};

static void ieee80211_if_setup(struct net_device *dev)
{
	ether_setup(dev);
1046
	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1047 1048 1049 1050
	dev->netdev_ops = &ieee80211_dataif_ops;
	dev->destructor = free_netdev;
}

1051 1052 1053 1054 1055 1056
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;
1057
	struct sta_info *sta;
1058
	struct ieee80211_ra_tid *ra_tid;
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075

	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))) {
1076 1077
		struct ieee80211_mgmt *mgmt = (void *)skb->data;

1078 1079 1080 1081 1082 1083 1084 1085 1086 1087
		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) {
1088 1089
			int len = skb->len;

1090
			mutex_lock(&local->sta_mtx);
1091
			sta = sta_info_get_bss(sdata, mgmt->sa);
1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110
			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;
				}
			}
1111
			mutex_unlock(&local->sta_mtx);
1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130
		} 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.
			 */
1131
			mutex_lock(&local->sta_mtx);
1132
			sta = sta_info_get_bss(sdata, mgmt->sa);
1133 1134 1135 1136 1137 1138
			if (sta) {
				u16 tid = *ieee80211_get_qos_ctl(hdr) &
						IEEE80211_QOS_CTL_TID_MASK;

				__ieee80211_stop_rx_ba_session(
					sta, tid, WLAN_BACK_RECIPIENT,
1139 1140
					WLAN_REASON_QSTA_REQUIRE_SETUP,
					true);
1141
			}
1142
			mutex_unlock(&local->sta_mtx);
1143
		} else switch (sdata->vif.type) {
1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158
		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;
		}
1159 1160

		kfree_skb(skb);
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180
	}

	/* 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;
	}
}

1181 1182 1183 1184 1185 1186 1187
static void ieee80211_recalc_smps_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data, recalc_smps);

	ieee80211_recalc_smps(sdata);
}
1188

1189 1190 1191 1192
/*
 * Helper function to initialise an interface to a specific type.
 */
static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1193
				  enum nl80211_iftype type)
1194
{
1195 1196 1197 1198 1199
	/* clear type-dependent union */
	memset(&sdata->u, 0, sizeof(sdata->u));

	/* and set some type-dependent values */
	sdata->vif.type = type;
1200
	sdata->vif.p2p = false;
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Johannes Berg 已提交
1201
	sdata->wdev.iftype = type;
1202

1203 1204 1205
	sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
	sdata->control_port_no_encrypt = false;

1206 1207
	sdata->noack_map = 0;

1208 1209 1210 1211 1212
	/* only monitor/p2p-device differ */
	if (sdata->dev) {
		sdata->dev->netdev_ops = &ieee80211_dataif_ops;
		sdata->dev->type = ARPHRD_ETHER;
	}
1213

J
Johannes Berg 已提交
1214
	skb_queue_head_init(&sdata->skb_queue);
1215
	INIT_WORK(&sdata->work, ieee80211_iface_work);
1216
	INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
J
Johannes Berg 已提交
1217

1218
	switch (type) {
1219 1220 1221 1222 1223
	case NL80211_IFTYPE_P2P_GO:
		type = NL80211_IFTYPE_AP;
		sdata->vif.type = type;
		sdata->vif.p2p = true;
		/* fall through */
1224
	case NL80211_IFTYPE_AP:
1225
		skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1226 1227
		INIT_LIST_HEAD(&sdata->u.ap.vlans);
		break;
1228 1229 1230 1231 1232
	case NL80211_IFTYPE_P2P_CLIENT:
		type = NL80211_IFTYPE_STATION;
		sdata->vif.type = type;
		sdata->vif.p2p = true;
		/* fall through */
1233
	case NL80211_IFTYPE_STATION:
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Johannes Berg 已提交
1234
		ieee80211_sta_setup_sdata(sdata);
1235
		break;
1236 1237 1238
	case NL80211_IFTYPE_ADHOC:
		ieee80211_ibss_setup_sdata(sdata);
		break;
1239
	case NL80211_IFTYPE_MESH_POINT:
1240 1241 1242
		if (ieee80211_vif_is_mesh(&sdata->vif))
			ieee80211_mesh_init_sdata(sdata);
		break;
1243
	case NL80211_IFTYPE_MONITOR:
1244
		sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1245
		sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1246 1247 1248
		sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
				      MONITOR_FLAG_OTHER_BSS;
		break;
1249 1250
	case NL80211_IFTYPE_WDS:
	case NL80211_IFTYPE_AP_VLAN:
1251
	case NL80211_IFTYPE_P2P_DEVICE:
1252
		break;
1253
	case NL80211_IFTYPE_UNSPECIFIED:
1254
	case NUM_NL80211_IFTYPES:
1255 1256 1257 1258 1259 1260 1261
		BUG();
		break;
	}

	ieee80211_debugfs_add_netdev(sdata);
}

1262 1263 1264 1265 1266
static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
					   enum nl80211_iftype type)
{
	struct ieee80211_local *local = sdata->local;
	int ret, err;
1267 1268
	enum nl80211_iftype internal_type = type;
	bool p2p = false;
1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300

	ASSERT_RTNL();

	if (!local->ops->change_interface)
		return -EBUSY;

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_ADHOC:
		/*
		 * Could maybe also all others here?
		 * Just not sure how that interacts
		 * with the RX/config path e.g. for
		 * mesh.
		 */
		break;
	default:
		return -EBUSY;
	}

	switch (type) {
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_ADHOC:
		/*
		 * Could probably support everything
		 * but WDS here (WDS do_open can fail
		 * under memory pressure, which this
		 * code isn't prepared to handle).
		 */
		break;
1301 1302 1303 1304 1305 1306 1307 1308
	case NL80211_IFTYPE_P2P_CLIENT:
		p2p = true;
		internal_type = NL80211_IFTYPE_STATION;
		break;
	case NL80211_IFTYPE_P2P_GO:
		p2p = true;
		internal_type = NL80211_IFTYPE_AP;
		break;
1309 1310 1311 1312
	default:
		return -EBUSY;
	}

1313
	ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1314 1315 1316 1317 1318
	if (ret)
		return ret;

	ieee80211_do_stop(sdata, false);

1319
	ieee80211_teardown_sdata(sdata);
1320

1321
	ret = drv_change_interface(local, sdata, internal_type, p2p);
1322 1323 1324
	if (ret)
		type = sdata->vif.type;

1325 1326 1327 1328 1329 1330 1331
	/*
	 * Ignore return value here, there's not much we can do since
	 * the driver changed the interface type internally already.
	 * The warnings will hopefully make driver authors fix it :-)
	 */
	ieee80211_check_queues(sdata);

1332 1333
	ieee80211_setup_sdata(sdata, type);

1334
	err = ieee80211_do_open(&sdata->wdev, false);
1335 1336 1337 1338 1339
	WARN(err, "type change: do_open returned %d", err);

	return ret;
}

1340
int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1341
			     enum nl80211_iftype type)
1342
{
1343 1344
	int ret;

1345 1346
	ASSERT_RTNL();

1347
	if (type == ieee80211_vif_type_p2p(&sdata->vif))
1348 1349
		return 0;

1350 1351 1352 1353 1354 1355
	if (ieee80211_sdata_running(sdata)) {
		ret = ieee80211_runtime_change_iftype(sdata, type);
		if (ret)
			return ret;
	} else {
		/* Purge and reset type-dependent state. */
1356
		ieee80211_teardown_sdata(sdata);
1357 1358
		ieee80211_setup_sdata(sdata, type);
	}
1359 1360 1361

	/* reset some values that shouldn't be kept across type changes */
	sdata->drop_unencrypted = 0;
1362 1363
	if (type == NL80211_IFTYPE_STATION)
		sdata->u.mgd.use_4addr = false;
1364 1365

	return 0;
1366 1367
}

1368
static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1369
				       u8 *perm_addr, enum nl80211_iftype type)
1370 1371 1372 1373 1374 1375 1376 1377
{
	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 */
1378
	memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395

	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;
1396
			memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1397 1398 1399 1400
			break;
		}
		/* keep default if no AP interface present */
		break;
1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413
	case NL80211_IFTYPE_P2P_CLIENT:
	case NL80211_IFTYPE_P2P_GO:
		if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
			list_for_each_entry(sdata, &local->interfaces, list) {
				if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
					continue;
				if (!ieee80211_sdata_running(sdata))
					continue;
				memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
				goto out_unlock;
			}
		}
		/* otherwise fall through */
1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427
	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) {
1428
				memcpy(perm_addr,
1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445
				       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! */
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Johannes Berg 已提交
1446
			pr_info("not contiguous\n");
1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478
			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) {
1479
				memcpy(perm_addr, tmp_addr, ETH_ALEN);
1480 1481 1482 1483 1484 1485 1486 1487
				break;
			}
			addr = (start & ~mask) | (val & mask);
		} while (addr != start);

		break;
	}

1488
 out_unlock:
1489 1490 1491
	mutex_unlock(&local->iflist_mtx);
}

1492 1493 1494 1495 1496 1497 1498 1499 1500
static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
{
	struct ieee80211_sub_if_data *sdata;

	sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);

	ieee80211_cleanup_sdata_stas(sdata);
}

1501
int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1502
		     struct wireless_dev **new_wdev, enum nl80211_iftype type,
1503
		     struct vif_params *params)
1504
{
1505
	struct net_device *ndev = NULL;
1506
	struct ieee80211_sub_if_data *sdata = NULL;
1507
	int ret, i;
1508
	int txqs = 1;
1509 1510

	ASSERT_RTNL();
1511

1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562
	if (type == NL80211_IFTYPE_P2P_DEVICE) {
		struct wireless_dev *wdev;

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

		sdata->dev = NULL;
		strlcpy(sdata->name, name, IFNAMSIZ);
		ieee80211_assign_perm_addr(local, wdev->address, type);
		memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
	} else {
		if (local->hw.queues >= IEEE80211_NUM_ACS)
			txqs = IEEE80211_NUM_ACS;

		ndev = alloc_netdev_mqs(sizeof(*sdata) +
					local->hw.vif_data_size,
					name, ieee80211_if_setup, txqs, 1);
		if (!ndev)
			return -ENOMEM;
		dev_net_set(ndev, wiphy_net(local->hw.wiphy));

		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;

		ret = dev_alloc_name(ndev, ndev->name);
		if (ret < 0) {
			free_netdev(ndev);
			return ret;
		}

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

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

		sdata->dev = ndev;
	}
1563 1564

	/* initialise type-independent data */
1565 1566
	sdata->wdev.wiphy = local->hw.wiphy;
	sdata->local = local;
1567 1568 1569
#ifdef CONFIG_INET
	sdata->arp_filter_state = true;
#endif
1570 1571 1572 1573 1574 1575

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

	INIT_LIST_HEAD(&sdata->key_list);

1576 1577 1578 1579
	spin_lock_init(&sdata->cleanup_stations_lock);
	INIT_LIST_HEAD(&sdata->cleanup_stations);
	INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);

1580 1581 1582 1583 1584
	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;
1585 1586 1587 1588 1589 1590 1591
		if (sband)
			memcpy(sdata->rc_rateidx_mcs_mask[i],
			       sband->ht_cap.mcs.rx_mask,
			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
		else
			memset(sdata->rc_rateidx_mcs_mask[i], 0,
			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
1592
	}
1593

1594 1595
	ieee80211_set_default_queues(sdata);

1596 1597 1598
	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
	sdata->user_power_level = local->user_power_level;

1599 1600
	/* setup type-dependent data */
	ieee80211_setup_sdata(sdata, type);
1601

1602 1603 1604 1605 1606 1607
	if (ndev) {
		if (params) {
			ndev->ieee80211_ptr->use_4addr = params->use_4addr;
			if (type == NL80211_IFTYPE_STATION)
				sdata->u.mgd.use_4addr = params->use_4addr;
		}
1608

1609
		ndev->features |= local->hw.netdev_features;
1610

1611 1612 1613 1614 1615 1616
		ret = register_netdevice(ndev);
		if (ret) {
			free_netdev(ndev);
			return ret;
		}
	}
1617

1618
	mutex_lock(&local->iflist_mtx);
1619
	list_add_tail_rcu(&sdata->list, &local->interfaces);
1620
	mutex_unlock(&local->iflist_mtx);
1621

1622 1623
	if (new_wdev)
		*new_wdev = &sdata->wdev;
1624 1625 1626 1627

	return 0;
}

1628
void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1629 1630
{
	ASSERT_RTNL();
J
Johannes Berg 已提交
1631

1632
	mutex_lock(&sdata->local->iflist_mtx);
1633
	list_del_rcu(&sdata->list);
1634 1635
	mutex_unlock(&sdata->local->iflist_mtx);

1636
	synchronize_rcu();
1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651

	if (sdata->dev) {
		unregister_netdevice(sdata->dev);
	} else {
		cfg80211_unregister_wdev(&sdata->wdev);
		kfree(sdata);
	}
}

void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
{
	if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
		return;
	ieee80211_do_stop(sdata, true);
	ieee80211_teardown_sdata(sdata);
1652 1653
}

1654 1655 1656 1657 1658
/*
 * 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)
1659
{
1660
	struct ieee80211_sub_if_data *sdata, *tmp;
1661
	LIST_HEAD(unreg_list);
1662
	LIST_HEAD(wdev_list);
1663 1664 1665

	ASSERT_RTNL();

1666
	mutex_lock(&local->iflist_mtx);
1667 1668
	list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
		list_del(&sdata->list);
1669

1670 1671 1672 1673
		if (sdata->dev)
			unregister_netdevice_queue(sdata->dev, &unreg_list);
		else
			list_add(&sdata->list, &wdev_list);
1674
	}
1675 1676
	mutex_unlock(&local->iflist_mtx);
	unregister_netdevice_many(&unreg_list);
1677
	list_del(&unreg_list);
1678 1679 1680 1681 1682 1683

	list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
		list_del(&sdata->list);
		cfg80211_unregister_wdev(&sdata->wdev);
		kfree(sdata);
	}
1684
}
J
Johannes Berg 已提交
1685

1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703
static int netdev_notify(struct notifier_block *nb,
			 unsigned long state,
			 void *ndev)
{
	struct net_device *dev = ndev;
	struct ieee80211_sub_if_data *sdata;

	if (state != NETDEV_CHANGENAME)
		return 0;

	if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
		return 0;

	if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
		return 0;

	sdata = IEEE80211_DEV_TO_SUB_IF(dev);

J
Johannes Berg 已提交
1704
	memcpy(sdata->name, dev->name, IFNAMSIZ);
1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722

	ieee80211_debugfs_rename_netdev(sdata);
	return 0;
}

static struct notifier_block mac80211_netdev_notifier = {
	.notifier_call = netdev_notify,
};

int ieee80211_iface_init(void)
{
	return register_netdevice_notifier(&mac80211_netdev_notifier);
}

void ieee80211_iface_exit(void)
{
	unregister_netdevice_notifier(&mac80211_netdev_notifier);
}