Commit 0d143fe1 authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville
Browse files

mac80211: move regular interface handling 



Move the code to handle regular interfaces out of main.c and
into iface.c, keep only the master interface stuff in main.c.

Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 05c914fe

net/mac80211/ieee80211_i.h

+1 −1
Original line number Diff line number Diff line
@@ -891,6 +891,7 @@ u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht, 
			struct ieee80211_ht_bss_info *req_bss_cap);

void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,

				      u32 changed);

void ieee80211_configure_filter(struct ieee80211_local *local);



/* wireless extensions */

extern const struct iw_handler_def ieee80211_iw_handler_def;
@@ -952,7 +953,6 @@ void ieee80211_rx_bss_put(struct ieee80211_local *local, 
			  struct ieee80211_bss *bss);



/* interface handling */

void ieee80211_if_setup(struct net_device *dev);

int ieee80211_if_add(struct ieee80211_local *local, const char *name,

		     struct net_device **new_dev, enum nl80211_iftype type,

		     struct vif_params *params);

net/mac80211/iface.c

+534 −0
Original line number Diff line number Diff line 
/*

 * Interface handling (except master interface)

 *

 * Copyright 2002-2005, Instant802 Networks, Inc.

 * Copyright 2005-2006, Devicescape Software, Inc.

 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
@@ -17,7 +19,539 @@ 
#include "sta_info.h"

#include "debugfs_netdev.h"

#include "mesh.h"

#include "led.h"



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;

}



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));

}



static int ieee80211_open(struct net_device *dev)

{

	struct ieee80211_sub_if_data *sdata, *nsdata;

	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);

	struct sta_info *sta;

	struct ieee80211_if_init_conf conf;

	u32 changed = 0;

	int res;

	bool need_hw_reconfig = 0;

	u8 null_addr[ETH_ALEN] = {0};



	sdata = IEEE80211_DEV_TO_SUB_IF(dev);



	/* fail early if user set an invalid address */

	if (compare_ether_addr(dev->dev_addr, null_addr) &&

	    !is_valid_ether_addr(dev->dev_addr))

		return -EADDRNOTAVAIL;



	/* 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;



		if (ndev != dev && netif_running(ndev)) {

			/*

			 * 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 == NL80211_IFTYPE_ADHOC &&

			    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

			 */

			if (!identical_mac_addr_allowed(sdata->vif.type,

							nsdata->vif.type))

				return -ENOTUNIQ;



			/*

			 * can only add VLANs to enabled APs

			 */

			if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&

			    nsdata->vif.type == NL80211_IFTYPE_AP)

				sdata->bss = &nsdata->u.ap;

		}

	}



	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:

	case __NL80211_IFTYPE_AFTER_LAST:

		/* cannot happen */

		WARN_ON(1);

		break;

	}



	if (local->open_count == 0) {

		res = 0;

		if (local->ops->start)

			res = local->ops->start(local_to_hw(local));

		if (res)

			goto err_del_bss;

		need_hw_reconfig = 1;

		ieee80211_led_radio(local, local->hw.conf.radio_enabled);

	}



	/*

	 * Check all interfaces and copy the hopefully now-present

	 * MAC address to those that have the special null one.

	 */

	list_for_each_entry(nsdata, &local->interfaces, list) {

		struct net_device *ndev = nsdata->dev;



		/*

		 * No need to check netif_running since we do not allow

		 * it to start up with this invalid address.

		 */

		if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)

			memcpy(ndev->dev_addr,

			       local->hw.wiphy->perm_addr,

			       ETH_ALEN);

	}



	if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)

		memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,

		       ETH_ALEN);



	/*

	 * Validate the MAC address for this device.

	 */

	if (!is_valid_ether_addr(dev->dev_addr)) {

		if (!local->open_count && local->ops->stop)

			local->ops->stop(local_to_hw(local));

		return -EADDRNOTAVAIL;

	}



	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++;

		if (local->monitors == 1)

			local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;



		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_addr_lock_bh(local->mdev);

		ieee80211_configure_filter(local);

		netif_addr_unlock_bh(local->mdev);

		break;

	case NL80211_IFTYPE_STATION:

	case NL80211_IFTYPE_ADHOC:

		sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;

		/* fall through */

	default:

		conf.vif = &sdata->vif;

		conf.type = sdata->vif.type;

		conf.mac_addr = dev->dev_addr;

		res = local->ops->add_interface(local_to_hw(local), &conf);

		if (res)

			goto err_stop;



		if (ieee80211_vif_is_mesh(&sdata->vif))

			ieee80211_start_mesh(sdata);

		changed |= ieee80211_reset_erp_info(sdata);

		ieee80211_bss_info_change_notify(sdata, changed);

		ieee80211_enable_keys(sdata);



		if (sdata->vif.type == NL80211_IFTYPE_STATION &&

		    !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))

			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;

		}

	}



	if (local->open_count == 0) {

		res = dev_open(local->mdev);

		WARN_ON(res);

		if (res)

			goto err_del_interface;

		tasklet_enable(&local->tx_pending_tasklet);

		tasklet_enable(&local->tasklet);

	}



	/*

	 * 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);



	local->open_count++;

	if (need_hw_reconfig) {

		ieee80211_hw_config(local);

		/*

		 * 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);

	}



	/*

	 * 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.

	 */

	if (sdata->vif.type == NL80211_IFTYPE_STATION ||

	    sdata->vif.type == NL80211_IFTYPE_ADHOC) {

		struct ieee80211_if_sta *ifsta = &sdata->u.sta;

		queue_work(local->hw.workqueue, &ifsta->work);

	}



	netif_tx_start_all_queues(dev);



	return 0;

 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));

 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;

	struct ieee80211_if_init_conf conf;

	struct sta_info *sta;



	/*

	 * Stop TX on this interface first.

	 */

	netif_tx_stop_all_queues(dev);



	/*

	 * Now delete all active aggregation sessions.

	 */

	rcu_read_lock();



	list_for_each_entry_rcu(sta, &local->sta_list, list) {

		if (sta->sdata == sdata)

			ieee80211_sta_tear_down_BA_sessions(sdata, sta->addr);

	}



	rcu_read_unlock();



	/*

	 * 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);



	/*

	 * 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);



	dev_mc_unsync(local->mdev, dev);



	/* APs need special treatment */

	if (sdata->vif.type == NL80211_IFTYPE_AP) {

		struct ieee80211_sub_if_data *vlan, *tmp;

		struct beacon_data *old_beacon = sdata->u.ap.beacon;



		/* remove beacon */

		rcu_assign_pointer(sdata->u.ap.beacon, NULL);

		synchronize_rcu();

		kfree(old_beacon);



		/* down all dependent devices, that is VLANs */

		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));

	}



	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--;

		if (local->monitors == 0)

			local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;



		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_addr_lock_bh(local->mdev);

		ieee80211_configure_filter(local);

		netif_addr_unlock_bh(local->mdev);

		break;

	case NL80211_IFTYPE_STATION:

	case NL80211_IFTYPE_ADHOC:

		sdata->u.sta.state = IEEE80211_STA_MLME_DISABLED;

		memset(sdata->u.sta.bssid, 0, ETH_ALEN);

		del_timer_sync(&sdata->u.sta.timer);

		/*

		 * If the timer fired while we waited for it, it will have

		 * requeued the work. Now the work will be running again

		 * but will not rearm the timer again because it checks

		 * whether the interface is running, which, at this point,

		 * it no longer is.

		 */

		cancel_work_sync(&sdata->u.sta.work);

		/*

		 * 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->u.sta.skb_queue);



		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;

		/* fall through */

	case NL80211_IFTYPE_MESH_POINT:

		if (ieee80211_vif_is_mesh(&sdata->vif)) {

			/* allmulti is always set on mesh ifaces */

			atomic_dec(&local->iff_allmultis);

			ieee80211_stop_mesh(sdata);

		}

		/* fall through */

	default:

		if (local->scan_sdata == sdata) {

			if (!local->ops->hw_scan)

				cancel_delayed_work_sync(&local->scan_work);

			/*

			 * The software scan can no longer run now, so we can

			 * clear out the scan_sdata reference. However, the

			 * hardware scan may still be running. The complete

			 * function must be prepared to handle a NULL value.

			 */

			local->scan_sdata = NULL;

			/*

			 * The memory barrier guarantees that another CPU

			 * that is hardware-scanning will now see the fact

			 * that this interface is gone.

			 */

			smp_mb();

			/*

			 * If software scanning, complete the scan but since

			 * the scan_sdata is NULL already don't send out a

			 * scan event to userspace -- the scan is incomplete.

			 */

			if (local->sw_scanning)

				ieee80211_scan_completed(&local->hw);

		}



		conf.vif = &sdata->vif;

		conf.type = sdata->vif.type;

		conf.mac_addr = dev->dev_addr;

		/* disable all keys for as long as this netdev is down */

		ieee80211_disable_keys(sdata);

		local->ops->remove_interface(local_to_hw(local), &conf);

	}



	sdata->bss = NULL;



	if (local->open_count == 0) {

		if (netif_running(local->mdev))

			dev_close(local->mdev);



		if (local->ops->stop)

			local->ops->stop(local_to_hw(local));



		ieee80211_led_radio(local, 0);



		flush_workqueue(local->hw.workqueue);



		tasklet_disable(&local->tx_pending_tasklet);

		tasklet_disable(&local->tasklet);

	}



	return 0;

}



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);

	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;

	}



	dev_mc_sync(local->mdev, dev);

}



static void ieee80211_if_setup(struct net_device *dev)

{

	ether_setup(dev);

	dev->hard_start_xmit = ieee80211_subif_start_xmit;

	dev->wireless_handlers = &ieee80211_iw_handler_def;

	dev->set_multicast_list = ieee80211_set_multicast_list;

	dev->change_mtu = ieee80211_change_mtu;

	dev->open = ieee80211_open;

	dev->stop = ieee80211_stop;

	dev->destructor = free_netdev;

	/* we will validate the address ourselves in ->open */

	dev->validate_addr = NULL;

}

/*

 * Called when the netdev is removed or, by the code below, before

 * the interface type changes.

net/mac80211/main.c

+15 −550

File changed.

Preview size limit exceeded, changes collapsed.