main.c 50.5 KB
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/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 *
 * 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 <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/wireless.h>
#include <linux/rtnetlink.h>
#include <linux/bitmap.h>
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#include <net/net_namespace.h>
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#include <net/cfg80211.h>

#include "ieee80211_i.h"
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#include "rate.h"
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#include "mesh.h"
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#include "wep.h"
#include "wme.h"
#include "aes_ccm.h"
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#include "led.h"
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#include "cfg.h"
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#include "debugfs.h"
#include "debugfs_netdev.h"
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/*
 * For seeing transmitted packets on monitor interfaces
 * we have a radiotap header too.
 */
struct ieee80211_tx_status_rtap_hdr {
	struct ieee80211_radiotap_header hdr;
	__le16 tx_flags;
	u8 data_retries;
} __attribute__ ((packed));

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/* common interface routines */
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static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
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{
	memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
	return ETH_ALEN;
}
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/* must be called under mdev tx lock */
static void ieee80211_configure_filter(struct ieee80211_local *local)
{
	unsigned int changed_flags;
	unsigned int new_flags = 0;

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	if (atomic_read(&local->iff_promiscs))
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		new_flags |= FIF_PROMISC_IN_BSS;

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	if (atomic_read(&local->iff_allmultis))
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		new_flags |= FIF_ALLMULTI;

	if (local->monitors)
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		new_flags |= FIF_BCN_PRBRESP_PROMISC;

	if (local->fif_fcsfail)
		new_flags |= FIF_FCSFAIL;

	if (local->fif_plcpfail)
		new_flags |= FIF_PLCPFAIL;

	if (local->fif_control)
		new_flags |= FIF_CONTROL;

	if (local->fif_other_bss)
		new_flags |= FIF_OTHER_BSS;
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	changed_flags = local->filter_flags ^ new_flags;

	/* be a bit nasty */
	new_flags |= (1<<31);

	local->ops->configure_filter(local_to_hw(local),
				     changed_flags, &new_flags,
				     local->mdev->mc_count,
				     local->mdev->mc_list);

	WARN_ON(new_flags & (1<<31));

	local->filter_flags = new_flags & ~(1<<31);
}

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/* master interface */
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static int ieee80211_master_open(struct net_device *dev)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata;
	int res = -EOPNOTSUPP;
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	/* we hold the RTNL here so can safely walk the list */
	list_for_each_entry(sdata, &local->interfaces, list) {
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		if (netif_running(sdata->dev)) {
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			res = 0;
			break;
		}
	}
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	if (res)
		return res;

	netif_start_queue(local->mdev);

	return 0;
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}
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static int ieee80211_master_stop(struct net_device *dev)
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{
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	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata;
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	/* we hold the RTNL here so can safely walk the list */
	list_for_each_entry(sdata, &local->interfaces, list)
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		if (netif_running(sdata->dev))
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			dev_close(sdata->dev);
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	return 0;
}
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static void ieee80211_master_set_multicast_list(struct net_device *dev)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);

	ieee80211_configure_filter(local);
}

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/* regular interfaces */
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static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
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{
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	int meshhdrlen;
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	meshhdrlen = (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) ? 5 : 0;

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	/* FIX: what would be proper limits for MTU?
	 * This interface uses 802.3 frames. */
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	if (new_mtu < 256 ||
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	    new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
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		return -EINVAL;
	}
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#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;
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	return 0;
}

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static inline int identical_mac_addr_allowed(int type1, int type2)
{
	return (type1 == IEEE80211_IF_TYPE_MNTR ||
		type2 == IEEE80211_IF_TYPE_MNTR ||
		(type1 == IEEE80211_IF_TYPE_AP &&
		 type2 == IEEE80211_IF_TYPE_WDS) ||
		(type1 == IEEE80211_IF_TYPE_WDS &&
		 (type2 == IEEE80211_IF_TYPE_WDS ||
		  type2 == IEEE80211_IF_TYPE_AP)) ||
		(type1 == IEEE80211_IF_TYPE_AP &&
		 type2 == IEEE80211_IF_TYPE_VLAN) ||
		(type1 == IEEE80211_IF_TYPE_VLAN &&
		 (type2 == IEEE80211_IF_TYPE_AP ||
		  type2 == IEEE80211_IF_TYPE_VLAN)));
}
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static int ieee80211_open(struct net_device *dev)
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{
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	struct ieee80211_sub_if_data *sdata, *nsdata;
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
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	struct sta_info *sta;
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	struct ieee80211_if_init_conf conf;
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	u32 changed = 0;
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	int res;
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	bool need_hw_reconfig = 0;
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	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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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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		struct net_device *ndev = nsdata->dev;
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		if (ndev != dev && netif_running(ndev)) {
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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...
			 */
			if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
			    nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
				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;

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

			/*
			 * can only add VLANs to enabled APs
			 */
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			if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
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			    nsdata->vif.type == IEEE80211_IF_TYPE_AP)
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				sdata->bss = &nsdata->u.ap;
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		}
	}
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	switch (sdata->vif.type) {
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	case IEEE80211_IF_TYPE_WDS:
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		if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
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			return -ENOLINK;
		break;
	case IEEE80211_IF_TYPE_VLAN:
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		if (!sdata->bss)
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			return -ENOLINK;
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		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
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		break;
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	case IEEE80211_IF_TYPE_AP:
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		sdata->bss = &sdata->u.ap;
		break;
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	case IEEE80211_IF_TYPE_STA:
	case IEEE80211_IF_TYPE_MNTR:
	case IEEE80211_IF_TYPE_IBSS:
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	case IEEE80211_IF_TYPE_MESH_POINT:
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		/* no special treatment */
		break;
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	case IEEE80211_IF_TYPE_INVALID:
		/* cannot happen */
		WARN_ON(1);
		break;
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	}
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	if (local->open_count == 0) {
		res = 0;
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		if (local->ops->start)
			res = local->ops->start(local_to_hw(local));
		if (res)
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			goto err_del_bss;
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		need_hw_reconfig = 1;
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		ieee80211_led_radio(local, local->hw.conf.radio_enabled);
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	}
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	switch (sdata->vif.type) {
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	case IEEE80211_IF_TYPE_VLAN:
		/* no need to tell driver */
		break;
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	case IEEE80211_IF_TYPE_MNTR:
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		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
			local->cooked_mntrs++;
			break;
		}

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		/* must be before the call to ieee80211_configure_filter */
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		local->monitors++;
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		if (local->monitors == 1)
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			local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
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		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++;

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		netif_addr_lock_bh(local->mdev);
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		ieee80211_configure_filter(local);
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		netif_addr_unlock_bh(local->mdev);
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		break;
	case IEEE80211_IF_TYPE_STA:
	case IEEE80211_IF_TYPE_IBSS:
		sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
		/* fall through */
	default:
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		conf.vif = &sdata->vif;
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		conf.type = sdata->vif.type;
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		conf.mac_addr = dev->dev_addr;
		res = local->ops->add_interface(local_to_hw(local), &conf);
		if (res)
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			goto err_stop;
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		if (ieee80211_vif_is_mesh(&sdata->vif))
			ieee80211_start_mesh(sdata->dev);
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		changed |= ieee80211_reset_erp_info(dev);
		ieee80211_bss_info_change_notify(sdata, changed);
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		ieee80211_enable_keys(sdata);
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		if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
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		    !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
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			netif_carrier_off(dev);
		else
			netif_carrier_on(dev);
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	}
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	if (sdata->vif.type == IEEE80211_IF_TYPE_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 locking required since STA is not live yet */
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		sta->flags |= WLAN_STA_AUTHORIZED;

		res = sta_info_insert(sta);
		if (res) {
			/* STA has been freed */
			goto err_del_interface;
		}
	}

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	if (local->open_count == 0) {
		res = dev_open(local->mdev);
		WARN_ON(res);
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		if (res)
			goto err_del_interface;
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		tasklet_enable(&local->tx_pending_tasklet);
		tasklet_enable(&local->tasklet);
	}

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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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	local->open_count++;
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	if (need_hw_reconfig)
		ieee80211_hw_config(local);
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	/*
	 * 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.
	 */
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	if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
	    sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
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		struct ieee80211_if_sta *ifsta = &sdata->u.sta;
		queue_work(local->hw.workqueue, &ifsta->work);
	}

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	netif_start_queue(dev);
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	return 0;
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 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));
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 err_del_bss:
	sdata->bss = NULL;
	if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
		list_del(&sdata->u.vlan.list);
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	return res;
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}

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static int ieee80211_stop(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;
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	struct ieee80211_if_init_conf conf;
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	struct sta_info *sta;
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	/*
	 * Stop TX on this interface first.
	 */
	netif_stop_queue(dev);
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	/*
	 * Now delete all active aggregation sessions.
	 */
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	rcu_read_lock();

	list_for_each_entry_rcu(sta, &local->sta_list, list) {
		if (sta->sdata == sdata)
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			ieee80211_sta_tear_down_BA_sessions(dev, sta->addr);
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	}

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	rcu_read_unlock();

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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!)
	 *
	 * 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);
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	/*
	 * 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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	dev_mc_unsync(local->mdev, dev);

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	/* APs need special treatment */
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	if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
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		struct ieee80211_sub_if_data *vlan, *tmp;
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		struct beacon_data *old_beacon = sdata->u.ap.beacon;
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		/* remove beacon */
		rcu_assign_pointer(sdata->u.ap.beacon, NULL);
		synchronize_rcu();
		kfree(old_beacon);

		/* down all dependent devices, that is VLANs */
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		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));
	}

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	local->open_count--;
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	switch (sdata->vif.type) {
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	case IEEE80211_IF_TYPE_VLAN:
		list_del(&sdata->u.vlan.list);
		/* no need to tell driver */
		break;
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	case IEEE80211_IF_TYPE_MNTR:
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		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
			local->cooked_mntrs--;
			break;
		}

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		local->monitors--;
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		if (local->monitors == 0)
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			local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
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		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--;

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		netif_addr_lock_bh(local->mdev);
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		ieee80211_configure_filter(local);
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		netif_addr_unlock_bh(local->mdev);
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		break;
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	case IEEE80211_IF_TYPE_MESH_POINT:
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	case IEEE80211_IF_TYPE_STA:
	case IEEE80211_IF_TYPE_IBSS:
		sdata->u.sta.state = IEEE80211_DISABLED;
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		memset(sdata->u.sta.bssid, 0, ETH_ALEN);
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		del_timer_sync(&sdata->u.sta.timer);
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		/*
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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.
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		 */
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		synchronize_rcu();
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		skb_queue_purge(&sdata->u.sta.skb_queue);
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		if (local->scan_dev == sdata->dev) {
			if (!local->ops->hw_scan) {
				local->sta_sw_scanning = 0;
				cancel_delayed_work(&local->scan_work);
			} else
				local->sta_hw_scanning = 0;
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		}
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		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;
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		/* fall through */
	default:
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		conf.vif = &sdata->vif;
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		conf.type = sdata->vif.type;
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		conf.mac_addr = dev->dev_addr;
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		/* disable all keys for as long as this netdev is down */
		ieee80211_disable_keys(sdata);
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		local->ops->remove_interface(local_to_hw(local), &conf);
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	}

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	sdata->bss = NULL;

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	if (local->open_count == 0) {
		if (netif_running(local->mdev))
			dev_close(local->mdev);
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		if (local->ops->stop)
			local->ops->stop(local_to_hw(local));
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		ieee80211_led_radio(local, 0);

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		flush_workqueue(local->hw.workqueue);

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		tasklet_disable(&local->tx_pending_tasklet);
		tasklet_disable(&local->tasklet);
	}

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	return 0;
}

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int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
{
	struct ieee80211_local *local = hw_to_local(hw);
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	struct netdev_queue *txq;
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	struct sta_info *sta;
	struct ieee80211_sub_if_data *sdata;
	u16 start_seq_num = 0;
	u8 *state;
	int ret;
	DECLARE_MAC_BUF(mac);

	if (tid >= STA_TID_NUM)
		return -EINVAL;

#ifdef CONFIG_MAC80211_HT_DEBUG
	printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
				print_mac(mac, ra), tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */

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	rcu_read_lock();

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	sta = sta_info_get(local, ra);
	if (!sta) {
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#ifdef CONFIG_MAC80211_HT_DEBUG
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		printk(KERN_DEBUG "Could not find the station\n");
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#endif
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		ret = -ENOENT;
		goto exit;
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	}

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	spin_lock_bh(&sta->lock);
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	/* we have tried too many times, receiver does not want A-MPDU */
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	if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
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		ret = -EBUSY;
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		goto err_unlock_sta;
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	}

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	state = &sta->ampdu_mlme.tid_state_tx[tid];
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	/* check if the TID is not in aggregation flow already */
	if (*state != HT_AGG_STATE_IDLE) {
#ifdef CONFIG_MAC80211_HT_DEBUG
		printk(KERN_DEBUG "BA request denied - session is not "
				 "idle on tid %u\n", tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */
		ret = -EAGAIN;
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		goto err_unlock_sta;
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	}

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	/* prepare A-MPDU MLME for Tx aggregation */
	sta->ampdu_mlme.tid_tx[tid] =
			kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
	if (!sta->ampdu_mlme.tid_tx[tid]) {
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#ifdef CONFIG_MAC80211_HT_DEBUG
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		if (net_ratelimit())
			printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
					tid);
611
#endif
612
		ret = -ENOMEM;
613
		goto err_unlock_sta;
614 615 616 617 618 619 620 621
	}
	/* Tx timer */
	sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
			sta_addba_resp_timer_expired;
	sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
			(unsigned long)&sta->timer_to_tid[tid];
	init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);

622 623
	/* ensure that TX flow won't interrupt us
	 * until the end of the call to requeue function */
624
	txq = netdev_get_tx_queue(local->mdev, 0);
625
	spin_lock_bh(&txq->lock);
626 627

	/* create a new queue for this aggregation */
628
	ret = ieee80211_ht_agg_queue_add(local, sta, tid);
629 630 631 632 633

	/* case no queue is available to aggregation
	 * don't switch to aggregation */
	if (ret) {
#ifdef CONFIG_MAC80211_HT_DEBUG
634
		printk(KERN_DEBUG "BA request denied - queue unavailable for"
635 636
					" tid %d\n", tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */
637
		goto err_unlock_queue;
638
	}
639
	sdata = sta->sdata;
640 641 642 643 644 645 646 647 648 649 650 651 652

	/* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
	 * call back right away, it must see that the flow has begun */
	*state |= HT_ADDBA_REQUESTED_MSK;

	if (local->ops->ampdu_action)
		ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
						ra, tid, &start_seq_num);

	if (ret) {
		/* No need to requeue the packets in the agg queue, since we
		 * held the tx lock: no packet could be enqueued to the newly
		 * allocated queue */
653
		 ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
654
#ifdef CONFIG_MAC80211_HT_DEBUG
655 656
		printk(KERN_DEBUG "BA request denied - HW unavailable for"
					" tid %d\n", tid);
657 658
#endif /* CONFIG_MAC80211_HT_DEBUG */
		*state = HT_AGG_STATE_IDLE;
659
		goto err_unlock_queue;
660 661 662
	}

	/* Will put all the packets in the new SW queue */
663
	ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
664
	spin_unlock_bh(&txq->lock);
665
	spin_unlock_bh(&sta->lock);
666 667 668

	/* send an addBA request */
	sta->ampdu_mlme.dialog_token_allocator++;
669
	sta->ampdu_mlme.tid_tx[tid]->dialog_token =
670
			sta->ampdu_mlme.dialog_token_allocator;
671
	sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
672

673

674
	ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
675 676
			 sta->ampdu_mlme.tid_tx[tid]->dialog_token,
			 sta->ampdu_mlme.tid_tx[tid]->ssn,
677 678
			 0x40, 5000);
	/* activate the timer for the recipient's addBA response */
679
	sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
680
				jiffies + ADDBA_RESP_INTERVAL;
681
	add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
682
#ifdef CONFIG_MAC80211_HT_DEBUG
683
	printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
684
#endif
685
	goto exit;
686

687
err_unlock_queue:
688 689
	kfree(sta->ampdu_mlme.tid_tx[tid]);
	sta->ampdu_mlme.tid_tx[tid] = NULL;
690
	spin_unlock_bh(&txq->lock);
691
	ret = -EBUSY;
692
err_unlock_sta:
693
	spin_unlock_bh(&sta->lock);
694
exit:
695
	rcu_read_unlock();
696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712
	return ret;
}
EXPORT_SYMBOL(ieee80211_start_tx_ba_session);

int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
				 u8 *ra, u16 tid,
				 enum ieee80211_back_parties initiator)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct sta_info *sta;
	u8 *state;
	int ret = 0;
	DECLARE_MAC_BUF(mac);

	if (tid >= STA_TID_NUM)
		return -EINVAL;

713
	rcu_read_lock();
714
	sta = sta_info_get(local, ra);
715 716
	if (!sta) {
		rcu_read_unlock();
717
		return -ENOENT;
718
	}
719 720

	/* check if the TID is in aggregation */
721
	state = &sta->ampdu_mlme.tid_state_tx[tid];
722
	spin_lock_bh(&sta->lock);
723 724 725 726 727 728

	if (*state != HT_AGG_STATE_OPERATIONAL) {
		ret = -ENOENT;
		goto stop_BA_exit;
	}

729 730 731 732 733
#ifdef CONFIG_MAC80211_HT_DEBUG
	printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
				print_mac(mac, ra), tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */

734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751
	ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);

	*state = HT_AGG_STATE_REQ_STOP_BA_MSK |
		(initiator << HT_AGG_STATE_INITIATOR_SHIFT);

	if (local->ops->ampdu_action)
		ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
						ra, tid, NULL);

	/* case HW denied going back to legacy */
	if (ret) {
		WARN_ON(ret != -EBUSY);
		*state = HT_AGG_STATE_OPERATIONAL;
		ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
		goto stop_BA_exit;
	}

stop_BA_exit:
752
	spin_unlock_bh(&sta->lock);
753
	rcu_read_unlock();
754 755 756 757 758 759 760 761 762 763 764 765
	return ret;
}
EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);

void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct sta_info *sta;
	u8 *state;
	DECLARE_MAC_BUF(mac);

	if (tid >= STA_TID_NUM) {
766
#ifdef CONFIG_MAC80211_HT_DEBUG
767 768
		printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
				tid, STA_TID_NUM);
769
#endif
770 771 772
		return;
	}

773
	rcu_read_lock();
774 775
	sta = sta_info_get(local, ra);
	if (!sta) {
776
		rcu_read_unlock();
777
#ifdef CONFIG_MAC80211_HT_DEBUG
778 779
		printk(KERN_DEBUG "Could not find station: %s\n",
				print_mac(mac, ra));
780
#endif
781 782 783
		return;
	}

784
	state = &sta->ampdu_mlme.tid_state_tx[tid];
785
	spin_lock_bh(&sta->lock);
786 787

	if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
788
#ifdef CONFIG_MAC80211_HT_DEBUG
789 790
		printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
				*state);
791
#endif
792
		spin_unlock_bh(&sta->lock);
793
		rcu_read_unlock();
794 795 796 797 798 799 800 801
		return;
	}

	WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);

	*state |= HT_ADDBA_DRV_READY_MSK;

	if (*state == HT_AGG_STATE_OPERATIONAL) {
802
#ifdef CONFIG_MAC80211_HT_DEBUG
803
		printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
804
#endif
805 806
		ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
	}
807
	spin_unlock_bh(&sta->lock);
808
	rcu_read_unlock();
809 810 811 812 813 814
}
EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);

void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
{
	struct ieee80211_local *local = hw_to_local(hw);
815
	struct netdev_queue *txq;
816 817 818 819 820 821
	struct sta_info *sta;
	u8 *state;
	int agg_queue;
	DECLARE_MAC_BUF(mac);

	if (tid >= STA_TID_NUM) {
822
#ifdef CONFIG_MAC80211_HT_DEBUG
823 824
		printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
				tid, STA_TID_NUM);
825
#endif
826 827 828
		return;
	}

829 830
#ifdef CONFIG_MAC80211_HT_DEBUG
	printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
831
				print_mac(mac, ra), tid);
832
#endif /* CONFIG_MAC80211_HT_DEBUG */
833

834
	rcu_read_lock();
835 836
	sta = sta_info_get(local, ra);
	if (!sta) {
837
#ifdef CONFIG_MAC80211_HT_DEBUG
838 839
		printk(KERN_DEBUG "Could not find station: %s\n",
				print_mac(mac, ra));
840
#endif
841
		rcu_read_unlock();
842 843
		return;
	}
844
	state = &sta->ampdu_mlme.tid_state_tx[tid];
845

846 847 848
	/* NOTE: no need to use sta->lock in this state check, as
	 * ieee80211_stop_tx_ba_session will let only
	 * one stop call to pass through per sta/tid */
849
	if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
850
#ifdef CONFIG_MAC80211_HT_DEBUG
851
		printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
852
#endif
853
		rcu_read_unlock();
854 855 856 857
		return;
	}

	if (*state & HT_AGG_STATE_INITIATOR_MSK)
858
		ieee80211_send_delba(sta->sdata->dev, ra, tid,
859 860 861 862 863 864
			WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);

	agg_queue = sta->tid_to_tx_q[tid];

	/* avoid ordering issues: we are the only one that can modify
	 * the content of the qdiscs */
865
	txq = netdev_get_tx_queue(local->mdev, 0);
866
	spin_lock_bh(&txq->lock);
867
	/* remove the queue for this aggregation */
868
	ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
869
	spin_unlock_bh(&txq->lock);
870 871

	/* we just requeued the all the frames that were in the removed
872
	 * queue, and since we might miss a softirq we do netif_schedule_queue.
873 874
	 * ieee80211_wake_queue is not used here as this queue is not
	 * necessarily stopped */
875
	netif_schedule_queue(txq);
876
	spin_lock_bh(&sta->lock);
877
	*state = HT_AGG_STATE_IDLE;
878 879 880
	sta->ampdu_mlme.addba_req_num[tid] = 0;
	kfree(sta->ampdu_mlme.tid_tx[tid]);
	sta->ampdu_mlme.tid_tx[tid] = NULL;
881
	spin_unlock_bh(&sta->lock);
882

883
	rcu_read_unlock();
884 885 886 887 888 889 890 891 892 893 894
}
EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);

void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
				      const u8 *ra, u16 tid)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_ra_tid *ra_tid;
	struct sk_buff *skb = dev_alloc_skb(0);

	if (unlikely(!skb)) {
895
#ifdef CONFIG_MAC80211_HT_DEBUG
896 897 898
		if (net_ratelimit())
			printk(KERN_WARNING "%s: Not enough memory, "
			       "dropping start BA session", skb->dev->name);
899
#endif
900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919
		return;
	}
	ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
	memcpy(&ra_tid->ra, ra, ETH_ALEN);
	ra_tid->tid = tid;

	skb->pkt_type = IEEE80211_ADDBA_MSG;
	skb_queue_tail(&local->skb_queue, skb);
	tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);

void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
				     const u8 *ra, u16 tid)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_ra_tid *ra_tid;
	struct sk_buff *skb = dev_alloc_skb(0);

	if (unlikely(!skb)) {
920
#ifdef CONFIG_MAC80211_HT_DEBUG
921 922 923
		if (net_ratelimit())
			printk(KERN_WARNING "%s: Not enough memory, "
			       "dropping stop BA session", skb->dev->name);
924
#endif
925 926 927 928 929 930 931 932 933 934 935 936
		return;
	}
	ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
	memcpy(&ra_tid->ra, ra, ETH_ALEN);
	ra_tid->tid = tid;

	skb->pkt_type = IEEE80211_DELBA_MSG;
	skb_queue_tail(&local->skb_queue, skb);
	tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);

937 938 939 940
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);
941
	int allmulti, promisc, sdata_allmulti, sdata_promisc;
942

943 944
	allmulti = !!(dev->flags & IFF_ALLMULTI);
	promisc = !!(dev->flags & IFF_PROMISC);
945 946
	sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
	sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
947 948 949

	if (allmulti != sdata_allmulti) {
		if (dev->flags & IFF_ALLMULTI)
950
			atomic_inc(&local->iff_allmultis);
951
		else
952
			atomic_dec(&local->iff_allmultis);
953
		sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
954
	}
955 956 957

	if (promisc != sdata_promisc) {
		if (dev->flags & IFF_PROMISC)
958
			atomic_inc(&local->iff_promiscs);
959
		else
960
			atomic_dec(&local->iff_promiscs);
961
		sdata->flags ^= IEEE80211_SDATA_PROMISC;
962
	}
963 964

	dev_mc_sync(local->mdev, dev);