iface.c 36.1 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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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;
}

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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 = 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 ||
		(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)
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{
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	struct ieee80211_local *local = sdata->local;
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	struct ieee80211_sub_if_data *nsdata;
	struct net_device *dev = sdata->dev;
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	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) {
		struct net_device *ndev = nsdata->dev;

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		if (ndev != dev && 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.
			 */
			if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
				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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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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/*
 * 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.
 */
static int ieee80211_do_open(struct net_device *dev, bool coming_up)
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{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
	u32 changed = 0;
	int res;
	u32 hw_reconf_flags = 0;

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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;

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		if (!sdata->bss)
			return -ENOLINK;
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		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;
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		break;
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		}
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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:
		/* no special treatment */
		break;
	case NL80211_IFTYPE_UNSPECIFIED:
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	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) {
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		res = drv_start(local);
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		if (res)
			goto err_del_bss;
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		if (local->ops->napi_poll)
			napi_enable(&local->napi);
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		/* 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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	}

	/*
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	 * Copy the hopefully now-present MAC address to
	 * this interface, if it has the special null one.
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	 */
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	if (is_zero_ether_addr(dev->dev_addr)) {
		memcpy(dev->dev_addr,
		       local->hw.wiphy->perm_addr,
		       ETH_ALEN);
		memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);

		if (!is_valid_ether_addr(dev->dev_addr)) {
			if (!local->open_count)
				drv_stop(local);
			return -EADDRNOTAVAIL;
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		}
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	}

	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++;
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		if (local->monitors == 1) {
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			local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
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		}
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		ieee80211_adjust_monitor_flags(sdata, 1);
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		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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			res = drv_add_interface(local, sdata);
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			if (res)
				goto err_stop;
		}
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		if (sdata->vif.type == NL80211_IFTYPE_AP) {
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			local->fif_pspoll++;
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			local->fif_probe_req++;
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			ieee80211_configure_filter(local);
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		} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
			local->fif_probe_req++;
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		}
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		changed |= ieee80211_reset_erp_info(sdata);
		ieee80211_bss_info_change_notify(sdata, changed);

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		if (sdata->vif.type == NL80211_IFTYPE_STATION ||
		    sdata->vif.type == NL80211_IFTYPE_ADHOC)
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			netif_carrier_off(dev);
		else
			netif_carrier_on(dev);
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		/*
		 * 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);
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	}

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	set_bit(SDATA_STATE_RUNNING, &sdata->state);

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	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;
		}

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		/* no atomic bitop required since STA is not live yet */
		set_sta_flag(sta, WLAN_STA_AUTHORIZED);
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		res = sta_info_insert(sta);
		if (res) {
			/* STA has been freed */
			goto err_del_interface;
		}
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		rate_control_rate_init(sta);
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	}

	/*
	 * 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);

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	mutex_lock(&local->mtx);
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	hw_reconf_flags |= __ieee80211_recalc_idle(local);
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	mutex_unlock(&local->mtx);
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	if (coming_up)
		local->open_count++;

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	if (hw_reconf_flags)
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		ieee80211_hw_config(local, hw_reconf_flags);
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	ieee80211_recalc_ps(local, -1);
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	netif_tx_start_all_queues(dev);
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	return 0;
 err_del_interface:
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	drv_remove_interface(local, sdata);
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 err_stop:
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	if (!local->open_count)
		drv_stop(local);
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 err_del_bss:
	sdata->bss = NULL;
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
		list_del(&sdata->u.vlan.list);
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	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
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	return res;
}

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static int ieee80211_open(struct net_device *dev)
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{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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	int err;

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

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

	return ieee80211_do_open(dev, true);
}

static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
			      bool going_down)
{
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	struct ieee80211_local *local = sdata->local;
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	unsigned long flags;
	struct sk_buff *skb, *tmp;
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	u32 hw_reconf_flags = 0;
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	int i;
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	enum nl80211_channel_type orig_ct;
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	clear_bit(SDATA_STATE_RUNNING, &sdata->state);

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	if (local->scan_sdata == sdata)
		ieee80211_scan_cancel(local);

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	/*
	 * Stop TX on this interface first.
	 */
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	netif_tx_stop_all_queues(sdata->dev);
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	/*
	 * Purge work for this interface.
	 */
	ieee80211_work_purge(sdata);

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	/*
	 * 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!)
	 *
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	 * This is relevant only in AP, WDS and mesh modes, since in
	 * all other modes we've already removed all stations when
	 * disconnecting etc.
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	 */
	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);

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	if (sdata->vif.type == NL80211_IFTYPE_AP) {
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		local->fif_pspoll--;
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		local->fif_probe_req--;
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
		local->fif_probe_req--;
	}
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	netif_addr_lock_bh(sdata->dev);
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	spin_lock_bh(&local->filter_lock);
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	__hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
			 sdata->dev->addr_len);
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	spin_unlock_bh(&local->filter_lock);
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	netif_addr_unlock_bh(sdata->dev);
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	ieee80211_configure_filter(local);

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	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);
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	/* APs need special treatment */
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
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		struct ieee80211_sub_if_data *vlan, *tmpsdata;
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		struct beacon_data *old_beacon =
			rtnl_dereference(sdata->u.ap.beacon);
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		/* sdata_running will return false, so this will disable */
		ieee80211_bss_info_change_notify(sdata,
						 BSS_CHANGED_BEACON_ENABLED);

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		/* remove beacon */
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		RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
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		synchronize_rcu();
		kfree(old_beacon);

		/* down all dependent devices, that is VLANs */
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		list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
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					 u.vlan.list)
			dev_close(vlan->dev);
		WARN_ON(!list_empty(&sdata->u.ap.vlans));
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		/* free all potentially still buffered bcast frames */
		local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
		skb_queue_purge(&sdata->u.ap.ps_bc_buf);
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	}

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	if (going_down)
		local->open_count--;
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	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--;
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		if (local->monitors == 0) {
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			local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
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		}
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		ieee80211_adjust_monitor_flags(sdata, -1);
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		ieee80211_configure_filter(local);
		break;
	default:
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		flush_work(&sdata->work);
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		/*
		 * When we get here, the interface is marked down.
		 * Call synchronize_rcu() to wait for the RX path
		 * should it be using the interface and enqueuing
		 * frames at this very time on another CPU.
		 */
		synchronize_rcu();
		skb_queue_purge(&sdata->skb_queue);

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		/*
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		 * Disable beaconing here for mesh only, AP and IBSS
		 * are already taken care of.
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		 */
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		if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
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			ieee80211_bss_info_change_notify(sdata,
				BSS_CHANGED_BEACON_ENABLED);

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		/*
		 * Free all remaining keys, there shouldn't be any,
		 * except maybe group keys in AP more or WDS?
		 */
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		ieee80211_free_keys(sdata);
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		if (going_down)
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			drv_remove_interface(local, sdata);
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	}

	sdata->bss = NULL;

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	mutex_lock(&local->mtx);
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	hw_reconf_flags |= __ieee80211_recalc_idle(local);
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	mutex_unlock(&local->mtx);
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	ieee80211_recalc_ps(local, -1);

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	if (local->open_count == 0) {
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		if (local->ops->napi_poll)
			napi_disable(&local->napi);
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		ieee80211_clear_tx_pending(local);
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		ieee80211_stop_device(local);
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		/* no reconfiguring after stop! */
		hw_reconf_flags = 0;
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	}

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	/* Re-calculate channel-type, in case there are multiple vifs
	 * on different channel types.
	 */
	orig_ct = local->_oper_channel_type;
	ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);

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	/* do after stop to avoid reconfiguring when we stop anyway */
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	if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
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		ieee80211_hw_config(local, hw_reconf_flags);

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	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
		skb_queue_walk_safe(&local->pending[i], skb, tmp) {
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
			if (info->control.vif == &sdata->vif) {
				__skb_unlink(skb, &local->pending[i]);
				dev_kfree_skb_irq(skb);
			}
		}
	}
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
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}

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);
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	return 0;
}

static void ieee80211_set_multicast_list(struct net_device *dev)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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	struct ieee80211_local *local = sdata->local;
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	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;
	}
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	spin_lock_bh(&local->filter_lock);
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	__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
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	spin_unlock_bh(&local->filter_lock);
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	ieee80211_queue_work(&local->hw, &local->reconfig_filter);
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}

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/*
 * Called when the netdev is removed or, by the code below, before
 * the interface type changes.
 */
static void ieee80211_teardown_sdata(struct net_device *dev)
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{
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	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
	int flushed;
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	int i;

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	/* free extra data */
	ieee80211_free_keys(sdata);

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	ieee80211_debugfs_remove_netdev(sdata);

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	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
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		__skb_queue_purge(&sdata->fragments[i].skb_list);
	sdata->fragment_next = 0;
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	if (ieee80211_vif_is_mesh(&sdata->vif))
		mesh_rmc_free(sdata);
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	flushed = sta_info_flush(local, sdata);
	WARN_ON(flushed);
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}

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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);
}

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static const struct net_device_ops ieee80211_dataif_ops = {
	.ndo_open		= ieee80211_open,
	.ndo_stop		= ieee80211_stop,
	.ndo_uninit		= ieee80211_teardown_sdata,
	.ndo_start_xmit		= ieee80211_subif_start_xmit,
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	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
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	.ndo_change_mtu 	= ieee80211_change_mtu,
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	.ndo_set_mac_address 	= ieee80211_change_mac,
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	.ndo_select_queue	= ieee80211_netdev_select_queue,
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};

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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;
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	u8 *p;
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	if (local->hw.queues < 4)
		return 0;

	if (skb->len < 4 ||
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	    skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
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		return 0; /* doesn't matter, frame will be dropped */

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	hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
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	if (!ieee80211_is_data(hdr->frame_control)) {
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		skb->priority = 7;
		return ieee802_1d_to_ac[skb->priority];
	}
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	if (!ieee80211_is_data_qos(hdr->frame_control)) {
		skb->priority = 0;
		return ieee802_1d_to_ac[skb->priority];
	}
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	p = ieee80211_get_qos_ctl(hdr);
	skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;

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	return ieee80211_downgrade_queue(local, skb);
}

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static const struct net_device_ops ieee80211_monitorif_ops = {
	.ndo_open		= ieee80211_open,
	.ndo_stop		= ieee80211_stop,
	.ndo_uninit		= ieee80211_teardown_sdata,
	.ndo_start_xmit		= ieee80211_monitor_start_xmit,
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	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
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	.ndo_change_mtu 	= ieee80211_change_mtu,
	.ndo_set_mac_address 	= eth_mac_addr,
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	.ndo_select_queue	= ieee80211_monitor_select_queue,
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};

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

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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;
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	struct sta_info *sta;
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	struct ieee80211_ra_tid *ra_tid;
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	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))) {
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		struct ieee80211_mgmt *mgmt = (void *)skb->data;

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		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) {
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			int len = skb->len;

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			mutex_lock(&local->sta_mtx);
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			sta = sta_info_get_bss(sdata, mgmt->sa);
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			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;
				}
			}
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			mutex_unlock(&local->sta_mtx);
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		} 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.
			 */
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			mutex_lock(&local->sta_mtx);
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			sta = sta_info_get_bss(sdata, mgmt->sa);
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			if (sta) {
				u16 tid = *ieee80211_get_qos_ctl(hdr) &
						IEEE80211_QOS_CTL_TID_MASK;

				__ieee80211_stop_rx_ba_session(
					sta, tid, WLAN_BACK_RECIPIENT,
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					WLAN_REASON_QSTA_REQUIRE_SETUP,
					true);
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			}
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			mutex_unlock(&local->sta_mtx);
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		} else switch (sdata->vif.type) {
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		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;
		}
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		kfree_skb(skb);
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	}

	/* 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;
	}
}


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/*
 * Helper function to initialise an interface to a specific type.
 */
static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
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				  enum nl80211_iftype type)
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{
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	/* clear type-dependent union */
	memset(&sdata->u, 0, sizeof(sdata->u));

	/* and set some type-dependent values */
	sdata->vif.type = type;
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	sdata->vif.p2p = false;
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	sdata->dev->netdev_ops = &ieee80211_dataif_ops;
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	sdata->wdev.iftype = type;
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	sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
	sdata->control_port_no_encrypt = false;

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

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	skb_queue_head_init(&sdata->skb_queue);
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	INIT_WORK(&sdata->work, ieee80211_iface_work);
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	switch (type) {
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	case NL80211_IFTYPE_P2P_GO:
		type = NL80211_IFTYPE_AP;
		sdata->vif.type = type;
		sdata->vif.p2p = true;
		/* fall through */
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	case NL80211_IFTYPE_AP:
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		skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
		INIT_LIST_HEAD(&sdata->u.ap.vlans);
		break;
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	case NL80211_IFTYPE_P2P_CLIENT:
		type = NL80211_IFTYPE_STATION;
		sdata->vif.type = type;
		sdata->vif.p2p = true;
		/* fall through */
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	case NL80211_IFTYPE_STATION:
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		ieee80211_sta_setup_sdata(sdata);
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		break;
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	case NL80211_IFTYPE_ADHOC:
		ieee80211_ibss_setup_sdata(sdata);
		break;
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	case NL80211_IFTYPE_MESH_POINT:
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		if (ieee80211_vif_is_mesh(&sdata->vif))
			ieee80211_mesh_init_sdata(sdata);
		break;
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	case NL80211_IFTYPE_MONITOR:
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		sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
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		sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
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		sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
				      MONITOR_FLAG_OTHER_BSS;
		break;
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	case NL80211_IFTYPE_WDS:
	case NL80211_IFTYPE_AP_VLAN:
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		break;
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	case NL80211_IFTYPE_UNSPECIFIED:
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	case NUM_NL80211_IFTYPES:
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		BUG();
		break;
	}

	ieee80211_debugfs_add_netdev(sdata);
}

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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;
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	enum nl80211_iftype internal_type = type;
	bool p2p = false;
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	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;
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	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;
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	default:
		return -EBUSY;
	}

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	ret = ieee80211_check_concurrent_iface(sdata, internal_type);
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	if (ret)
		return ret;

	ieee80211_do_stop(sdata, false);

	ieee80211_teardown_sdata(sdata->dev);

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

	ieee80211_setup_sdata(sdata, type);

	err = ieee80211_do_open(sdata->dev, false);
	WARN(err, "type change: do_open returned %d", err);

	return ret;
}

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int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
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			     enum nl80211_iftype type)
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{
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	int ret;

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	ASSERT_RTNL();

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

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

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	if (ieee80211_sdata_running(sdata)) {
		ret = ieee80211_runtime_change_iftype(sdata, type);
		if (ret)
			return ret;
	} else {
		/* Purge and reset type-dependent state. */
		ieee80211_teardown_sdata(sdata->dev);
		ieee80211_setup_sdata(sdata, type);
	}
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	/* reset some values that shouldn't be kept across type changes */
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	sdata->vif.bss_conf.basic_rates =
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		ieee80211_mandatory_rates(sdata->local,
			sdata->local->hw.conf.channel->band);
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	sdata->drop_unencrypted = 0;
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	if (type == NL80211_IFTYPE_STATION)
		sdata->u.mgd.use_4addr = false;
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	return 0;
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}

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