Release 4.14 net/mac80211/iface.c

/*
 * Interface handling
 *
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 * Copyright (c) 2016        Intel Deutschland GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
#include "ieee80211_i.h"
#include "sta_info.h"
#include "debugfs_netdev.h"
#include "mesh.h"
#include "led.h"
#include "driver-ops.h"
#include "wme.h"
#include "rate.h"

/**
 * 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.
 */

static void ieee80211_iface_work(struct work_struct *work);



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;
	}

	power = ieee80211_chandef_max_power(&chanctx_conf->def);
	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;
}

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void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
			      bool update_bss)
{
	if (__ieee80211_recalc_txpower(sdata) ||
	    (update_bss && ieee80211_sdata_running(sdata)))
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
}

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static u32 __ieee80211_idle_off(struct ieee80211_local *local)
{
	if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
		return 0;

	local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
	return IEEE80211_CONF_CHANGE_IDLE;
}

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static u32 __ieee80211_idle_on(struct ieee80211_local *local)
{
	if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
		return 0;

	ieee80211_flush_queues(local, NULL, false);

	local->hw.conf.flags |= IEEE80211_CONF_IDLE;
	return IEEE80211_CONF_CHANGE_IDLE;
}

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static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
				   bool force_active)
{
	bool working, scanning, active;
	unsigned int led_trig_start = 0, led_trig_stop = 0;

	lockdep_assert_held(&local->mtx);

	active = force_active ||
		 !list_empty(&local->chanctx_list) ||
		 local->monitors;

	working = !local->ops->remain_on_channel &&
		  !list_empty(&local->roc_list);

	scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
		   test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);

	if (working || scanning)
		led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
	else
		led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;

	if (active)
		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 || scanning || active)
		return __ieee80211_idle_off(local);
	return __ieee80211_idle_on(local);
}

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u32 ieee80211_idle_off(struct ieee80211_local *local)
{
	return __ieee80211_recalc_idle(local, true);
}

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void ieee80211_recalc_idle(struct ieee80211_local *local)
{
	u32 change = __ieee80211_recalc_idle(local, false);
	if (change)
		ieee80211_hw_config(local, change);
}

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static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
				bool check_dup)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_sub_if_data *iter;
	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);

	if (!check_dup)
		return ret;

	mutex_lock(&local->iflist_mtx);
	list_for_each_entry(iter, &local->interfaces, list) {
		if (iter == sdata)
			continue;

		if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
		    !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
			continue;

		m = iter->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);
	struct sockaddr *sa = addr;
	bool check_dup = true;
	int ret;

	if (ieee80211_sdata_running(sdata))
		return -EBUSY;

	if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
	    !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
		check_dup = false;

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

	ret = eth_mac_addr(dev, sa);

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

	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_P2P_DEVICE ||
		type2 == NL80211_IFTYPE_P2P_DEVICE ||
		(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)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_sub_if_data *nsdata;
	int ret;

	ASSERT_RTNL();

	/* we hold the RTNL here so can safely walk the list */
	list_for_each_entry(nsdata, &local->interfaces, list) {
		if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
			/*
                         * Only OCB and monitor mode may coexist
                         */
			if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
			     nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
			    (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
			     nsdata->vif.type == NL80211_IFTYPE_OCB))
				return -EBUSY;

			/*
                         * 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 (iftype == NL80211_IFTYPE_ADHOC &&
			    nsdata->vif.type == NL80211_IFTYPE_ADHOC)
				return -EBUSY;
			/*
                         * will not add another interface while any channel
                         * switch is active.
                         */
			if (nsdata->vif.csa_active)
				return -EBUSY;

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

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

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

	mutex_lock(&local->chanctx_mtx);
	ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
	mutex_unlock(&local->chanctx_mtx);
	return ret;
}

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static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
				  enum nl80211_iftype iftype)
{
	int n_queues = sdata->local->hw.queues;
	int i;

	if (iftype == NL80211_IFTYPE_NAN)
		return 0;

	if (iftype != 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;
		}
	}

	if ((iftype != NL80211_IFTYPE_AP &&
	     iftype != NL80211_IFTYPE_P2P_GO &&
	     iftype != NL80211_IFTYPE_MESH_POINT) ||
	    !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
		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 (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
			sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
		else if (local->hw.queues >= IEEE80211_NUM_ACS)
			sdata->vif.hw_queue[i] = i;
		else
			sdata->vif.hw_queue[i] = 0;
	}
	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
}

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int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
{
	struct ieee80211_sub_if_data *sdata;
	int ret;

	if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
		return 0;

	ASSERT_RTNL();

	if (local->monitor_sdata)
		return 0;

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

	/* set up data */
	sdata->local = local;
	sdata->vif.type = NL80211_IFTYPE_MONITOR;
	snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
		 wiphy_name(local->hw.wiphy));
	sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;

	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;

	ieee80211_set_default_queues(sdata);

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

	ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
	if (ret) {
		kfree(sdata);
		return ret;
	}

	mutex_lock(&local->iflist_mtx);
	rcu_assign_pointer(local->monitor_sdata, sdata);
	mutex_unlock(&local->iflist_mtx);

	mutex_lock(&local->mtx);
	ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
					IEEE80211_CHANCTX_EXCLUSIVE);
	mutex_unlock(&local->mtx);
	if (ret) {
		mutex_lock(&local->iflist_mtx);
		RCU_INIT_POINTER(local->monitor_sdata, NULL);
		mutex_unlock(&local->iflist_mtx);
		synchronize_net();
		drv_remove_interface(local, sdata);
		kfree(sdata);
		return ret;
	}

	skb_queue_head_init(&sdata->skb_queue);
	INIT_WORK(&sdata->work, ieee80211_iface_work);

	return 0;
}

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void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
{
	struct ieee80211_sub_if_data *sdata;

	if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
		return;

	ASSERT_RTNL();

	mutex_lock(&local->iflist_mtx);

	sdata = rcu_dereference_protected(local->monitor_sdata,
					  lockdep_is_held(&local->iflist_mtx));
	if (!sdata) {
		mutex_unlock(&local->iflist_mtx);
		return;
	}

	RCU_INIT_POINTER(local->monitor_sdata, NULL);
	mutex_unlock(&local->iflist_mtx);

	synchronize_net();

	mutex_lock(&local->mtx);
	ieee80211_vif_release_channel(sdata);
	mutex_unlock(&local->mtx);

	drv_remove_interface(local, sdata);

	kfree(sdata);
}

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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.
 */


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

	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: {
		struct ieee80211_sub_if_data *master;

		if (!sdata->bss)
			return -ENOLINK;

		mutex_lock(&local->mtx);
		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
		mutex_unlock(&local->mtx);

		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;
		sdata->vif.cab_queue = master->vif.cab_queue;
		memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
		       sizeof(sdata->vif.hw_queue));
		sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;

		mutex_lock(&local->key_mtx);
		sdata->crypto_tx_tailroom_needed_cnt +=
			master->crypto_tx_tailroom_needed_cnt;
		mutex_unlock(&local->key_mtx);

		break;
		}
	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:
	case NL80211_IFTYPE_P2P_DEVICE:
	case NL80211_IFTYPE_OCB:
	case NL80211_IFTYPE_NAN:
		/* no special treatment */
		break;
	case NL80211_IFTYPE_UNSPECIFIED:
	case NUM_NL80211_IFTYPES:
	case NL80211_IFTYPE_P2P_CLIENT:
	case NL80211_IFTYPE_P2P_GO:
		/* cannot happen */
		WARN_ON(1);
		break;
	}

	if (local->open_count == 0) {
		res = drv_start(local);
		if (res)
			goto err_del_bss;
		/* we're brought up, everything changes */
		hw_reconf_flags = ~0;
		ieee80211_led_radio(local, true);
		ieee80211_mod_tpt_led_trig(local,
					   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
	}

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

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

		if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
			res = drv_add_interface(local, sdata);
			if (res)
				goto err_stop;
		} else if (local->monitors == 0 && local->open_count == 0) {
			res = ieee80211_add_virtual_monitor(local);
			if (res)
				goto err_stop;
		}

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

		ieee80211_adjust_monitor_flags(sdata, 1);
		ieee80211_configure_filter(local);
		mutex_lock(&local->mtx);
		ieee80211_recalc_idle(local);
		mutex_unlock(&local->mtx);

		netif_carrier_on(dev);
		break;
	default:
		if (coming_up) {
			ieee80211_del_virtual_monitor(local);

			res = drv_add_interface(local, sdata);
			if (res)
				goto err_stop;
			res = ieee80211_check_queues(sdata,
				ieee80211_vif_type_p2p(&sdata->vif));
			if (res)
				goto err_del_interface;
		}

		if (sdata->vif.type == NL80211_IFTYPE_AP) {
			local->fif_pspoll++;
			local->fif_probe_req++;

			ieee80211_configure_filter(local);
		} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
			local->fif_probe_req++;
		}

		if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
		    sdata->vif.type != NL80211_IFTYPE_NAN)
			changed |= ieee80211_reset_erp_info(sdata);
		ieee80211_bss_info_change_notify(sdata, changed);

		switch (sdata->vif.type) {
		case NL80211_IFTYPE_STATION:
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_MESH_POINT:
		case NL80211_IFTYPE_OCB:
			netif_carrier_off(dev);
			break;
		case NL80211_IFTYPE_WDS:
		case NL80211_IFTYPE_P2P_DEVICE:
		case NL80211_IFTYPE_NAN:
			break;
		default:
			/* not reached */
			WARN_ON(1);
		}

		/*
                 * Set default queue parameters so drivers don't
                 * need to initialise the hardware if the hardware
                 * doesn't start up with sane defaults.
                 * Enable QoS for anything but station interfaces.
                 */
		ieee80211_set_wmm_default(sdata, true,
			sdata->vif.type != NL80211_IFTYPE_STATION);
	}

	set_bit(SDATA_STATE_RUNNING, &sdata->state);

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_WDS:
		/* Create STA entry for the WDS peer */
		sta = sta_info_alloc(