Commit 685fb72b authored by Johannes Berg's avatar Johannes Berg
Browse files

mac80211: iterate the virtual monitor interface 



If the virtual monitor interface is requested
by the driver, it should also be iterated over
when the driver wants to iterate all active
interfaces.

To allow that protect it with the iflist_mtx.

Change-Id: I58ac5de2f4ce93d12c5a98ecd2859f60158d5d69
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 8e95ea49

net/mac80211/iface.c

+19 −10
Original line number Diff line number Diff line
@@ -334,17 +334,21 @@ static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata) 
int ieee80211_add_virtual_monitor(struct ieee80211_local *local)

{

	struct ieee80211_sub_if_data *sdata;

	int ret;

	int ret = 0;



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

		return 0;



	mutex_lock(&local->iflist_mtx);



	if (local->monitor_sdata)

		return 0;

		goto out_unlock;



	sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);

	if (!sdata)

		return -ENOMEM;

	if (!sdata) {

		ret = -ENOMEM;

		goto out_unlock;

	}



	/* set up data */

	sdata->local = local;
@@ -358,18 +362,19 @@ int ieee80211_add_virtual_monitor(struct ieee80211_local *local) 
	if (WARN_ON(ret)) {

		/* ok .. stupid driver, it asked for this! */

		kfree(sdata);

		return ret;

		goto out_unlock;

	}



	ret = ieee80211_check_queues(sdata);

	if (ret) {

		kfree(sdata);

		return ret;

		goto out_unlock;

	}



	rcu_assign_pointer(local->monitor_sdata, sdata);



	return 0;

 out_unlock:

	mutex_unlock(&local->iflist_mtx);

	return ret;

}



void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
@@ -379,10 +384,12 @@ void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 
	if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))

		return;



	sdata = rtnl_dereference(local->monitor_sdata);

	mutex_lock(&local->iflist_mtx);



	sdata = rcu_dereference_protected(local->monitor_sdata,

					  lockdep_is_held(&local->iflist_mtx));

	if (!sdata)

		return;

		goto out_unlock;



	rcu_assign_pointer(local->monitor_sdata, NULL);

	synchronize_net();
@@ -390,6 +397,8 @@ void ieee80211_del_virtual_monitor(struct ieee80211_local *local) 
	drv_remove_interface(local, sdata);



	kfree(sdata);

 out_unlock:

	mutex_unlock(&local->iflist_mtx);

}



/*

net/mac80211/util.c

+9 −0
Original line number Diff line number Diff line
@@ -529,6 +529,11 @@ void ieee80211_iterate_active_interfaces( 
				 &sdata->vif);

	}



	sdata = rcu_dereference_protected(local->monitor_sdata,

					  lockdep_is_held(&local->iflist_mtx));

	if (sdata)

		iterator(data, sdata->vif.addr, &sdata->vif);



	mutex_unlock(&local->iflist_mtx);

}

EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
@@ -557,6 +562,10 @@ void ieee80211_iterate_active_interfaces_atomic( 
				 &sdata->vif);

	}



	sdata = rcu_dereference(local->monitor_sdata);

	if (sdata)

		iterator(data, sdata->vif.addr, &sdata->vif);



	rcu_read_unlock();

}

EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);

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