mlme.c 73.3 KB
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/*
 * BSS client mode implementation
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 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
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 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
 *
 * 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/delay.h>
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#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
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#include <linux/rtnetlink.h>
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#include <linux/pm_qos_params.h>
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#include <linux/crc32.h>
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#include <linux/slab.h>
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#include <net/mac80211.h>
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#include <asm/unaligned.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "rate.h"
#include "led.h"
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static int max_nullfunc_tries = 2;
module_param(max_nullfunc_tries, int, 0644);
MODULE_PARM_DESC(max_nullfunc_tries,
		 "Maximum nullfunc tx tries before disconnecting (reason 4).");

static int max_probe_tries = 5;
module_param(max_probe_tries, int, 0644);
MODULE_PARM_DESC(max_probe_tries,
		 "Maximum probe tries before disconnecting (reason 4).");
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/*
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 * Beacon loss timeout is calculated as N frames times the
 * advertised beacon interval.  This may need to be somewhat
 * higher than what hardware might detect to account for
 * delays in the host processing frames. But since we also
 * probe on beacon miss before declaring the connection lost
 * default to what we want.
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 */
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#define IEEE80211_BEACON_LOSS_COUNT	7

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/*
 * Time the connection can be idle before we probe
 * it to see if we can still talk to the AP.
 */
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#define IEEE80211_CONNECTION_IDLE_TIME	(30 * HZ)
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/*
 * Time we wait for a probe response after sending
 * a probe request because of beacon loss or for
 * checking the connection still works.
 */
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static int probe_wait_ms = 500;
module_param(probe_wait_ms, int, 0644);
MODULE_PARM_DESC(probe_wait_ms,
		 "Maximum time(ms) to wait for probe response"
		 " before disconnecting (reason 4).");
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/*
 * Weight given to the latest Beacon frame when calculating average signal
 * strength for Beacon frames received in the current BSS. This must be
 * between 1 and 15.
 */
#define IEEE80211_SIGNAL_AVE_WEIGHT	3

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/*
 * How many Beacon frames need to have been used in average signal strength
 * before starting to indicate signal change events.
 */
#define IEEE80211_SIGNAL_AVE_MIN_COUNT	4

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#define TMR_RUNNING_TIMER	0
#define TMR_RUNNING_CHANSW	1

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/*
 * All cfg80211 functions have to be called outside a locked
 * section so that they can acquire a lock themselves... This
 * is much simpler than queuing up things in cfg80211, but we
 * do need some indirection for that here.
 */
enum rx_mgmt_action {
	/* no action required */
	RX_MGMT_NONE,

	/* caller must call cfg80211_send_deauth() */
	RX_MGMT_CFG80211_DEAUTH,

	/* caller must call cfg80211_send_disassoc() */
	RX_MGMT_CFG80211_DISASSOC,
};

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/* utils */
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static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
{
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	lockdep_assert_held(&ifmgd->mtx);
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}

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/*
 * We can have multiple work items (and connection probing)
 * scheduling this timer, but we need to take care to only
 * reschedule it when it should fire _earlier_ than it was
 * asked for before, or if it's not pending right now. This
 * function ensures that. Note that it then is required to
 * run this function for all timeouts after the first one
 * has happened -- the work that runs from this timer will
 * do that.
 */
static void run_again(struct ieee80211_if_managed *ifmgd,
			     unsigned long timeout)
{
	ASSERT_MGD_MTX(ifmgd);

	if (!timer_pending(&ifmgd->timer) ||
	    time_before(timeout, ifmgd->timer.expires))
		mod_timer(&ifmgd->timer, timeout);
}

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void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
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{
	if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
		return;

	mod_timer(&sdata->u.mgd.bcn_mon_timer,
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		  round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
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}

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void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
{
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	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

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	if (unlikely(!sdata->u.mgd.associated))
		return;

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	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
		return;

	mod_timer(&sdata->u.mgd.conn_mon_timer,
		  round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
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	ifmgd->probe_send_count = 0;
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}

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static int ecw2cw(int ecw)
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{
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	return (1 << ecw) - 1;
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}

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/*
 * ieee80211_enable_ht should be called only after the operating band
 * has been determined as ht configuration depends on the hw's
 * HT abilities for a specific band.
 */
static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
			       struct ieee80211_ht_info *hti,
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			       const u8 *bssid, u16 ap_ht_cap_flags)
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{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	struct sta_info *sta;
	u32 changed = 0;
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	int hti_cfreq;
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	u16 ht_opmode;
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	bool enable_ht = true;
	enum nl80211_channel_type prev_chantype;
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	enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

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	prev_chantype = sdata->vif.bss_conf.channel_type;

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	/* HT is not supported */
	if (!sband->ht_cap.ht_supported)
		enable_ht = false;

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	if (enable_ht) {
		hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
							   sband->band);
		/* check that channel matches the right operating channel */
		if (local->hw.conf.channel->center_freq != hti_cfreq) {
			/* Some APs mess this up, evidently.
			 * Netgear WNDR3700 sometimes reports 4 higher than
			 * the actual channel, for instance.
			 */
			printk(KERN_DEBUG
			       "%s: Wrong control channel in association"
			       " response: configured center-freq: %d"
			       " hti-cfreq: %d  hti->control_chan: %d"
			       " band: %d.  Disabling HT.\n",
			       sdata->name,
			       local->hw.conf.channel->center_freq,
			       hti_cfreq, hti->control_chan,
			       sband->band);
			enable_ht = false;
		}
	}
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	if (enable_ht) {
		channel_type = NL80211_CHAN_HT20;

		if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
		    (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
		    (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
			switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
			case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
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				if (!(local->hw.conf.channel->flags &
				    IEEE80211_CHAN_NO_HT40PLUS))
					channel_type = NL80211_CHAN_HT40PLUS;
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				break;
			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
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				if (!(local->hw.conf.channel->flags &
				    IEEE80211_CHAN_NO_HT40MINUS))
					channel_type = NL80211_CHAN_HT40MINUS;
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				break;
			}
		}
	}

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	if (local->tmp_channel)
		local->tmp_channel_type = channel_type;
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	if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
		/* can only fail due to HT40+/- mismatch */
		channel_type = NL80211_CHAN_HT20;
		WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
	}
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	ieee80211_stop_queues_by_reason(&sdata->local->hw,
					IEEE80211_QUEUE_STOP_REASON_CSA);

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	/* channel_type change automatically detected */
	ieee80211_hw_config(local, 0);
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	if (prev_chantype != channel_type) {
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		rcu_read_lock();
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		sta = sta_info_get(sdata, bssid);
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		if (sta)
			rate_control_rate_update(local, sband, sta,
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						 IEEE80211_RC_HT_CHANGED,
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						 channel_type);
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		rcu_read_unlock();
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	}
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	ieee80211_wake_queues_by_reason(&sdata->local->hw,
					IEEE80211_QUEUE_STOP_REASON_CSA);

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	ht_opmode = le16_to_cpu(hti->operation_mode);
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	/* if bss configuration changed store the new one */
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	if (sdata->ht_opmode_valid != enable_ht ||
	    sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
	    prev_chantype != channel_type) {
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		changed |= BSS_CHANGED_HT;
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		sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
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		sdata->ht_opmode_valid = enable_ht;
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	}

	return changed;
}

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/* frame sending functions */

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static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
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					   const u8 *bssid, u16 stype, u16 reason,
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					   void *cookie, bool send_frame)
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{
	struct ieee80211_local *local = sdata->local;
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	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
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	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
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	if (!skb) {
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		printk(KERN_DEBUG "%s: failed to allocate buffer for "
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		       "deauth/disassoc frame\n", sdata->name);
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		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
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	memcpy(mgmt->da, bssid, ETH_ALEN);
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	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
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	memcpy(mgmt->bssid, bssid, ETH_ALEN);
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	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
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	skb_put(skb, 2);
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	/* u.deauth.reason_code == u.disassoc.reason_code */
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	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

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	if (stype == IEEE80211_STYPE_DEAUTH)
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		if (cookie)
			__cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
		else
			cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
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	else
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		if (cookie)
			__cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
		else
			cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
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	if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
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	if (send_frame)
		ieee80211_tx_skb(sdata, skb);
	else
		kfree_skb(skb);
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}

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void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

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	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
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		return;

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	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
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	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
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}

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void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	struct sk_buff *skb;
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	struct ieee80211_hdr_3addr *nullfunc;
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	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
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		return;

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	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
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	if (powersave)
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		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
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	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
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}

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static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
					  struct ieee80211_sub_if_data *sdata)
{
	struct sk_buff *skb;
	struct ieee80211_hdr *nullfunc;
	__le16 fc;

	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
		return;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
		       "nullfunc frame\n", sdata->name);
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
	memset(nullfunc, 0, 30);
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
			 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
	nullfunc->frame_control = fc;
	memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
	memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
	memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
	memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);

	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
}

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/* spectrum management related things */
static void ieee80211_chswitch_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

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	if (!ieee80211_sdata_running(sdata))
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		return;

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	mutex_lock(&ifmgd->mtx);
	if (!ifmgd->associated)
		goto out;
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	sdata->local->oper_channel = sdata->local->csa_channel;
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	if (!sdata->local->ops->channel_switch) {
		/* call "hw_config" only if doing sw channel switch */
		ieee80211_hw_config(sdata->local,
			IEEE80211_CONF_CHANGE_CHANNEL);
	}
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	/* XXX: shouldn't really modify cfg80211-owned data! */
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	ifmgd->associated->channel = sdata->local->oper_channel;
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	ieee80211_wake_queues_by_reason(&sdata->local->hw,
					IEEE80211_QUEUE_STOP_REASON_CSA);
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 out:
	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
	mutex_unlock(&ifmgd->mtx);
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}

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void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_managed *ifmgd;

	sdata = vif_to_sdata(vif);
	ifmgd = &sdata->u.mgd;

	trace_api_chswitch_done(sdata, success);
	if (!success) {
		/*
		 * If the channel switch was not successful, stay
		 * around on the old channel. We currently lack
		 * good handling of this situation, possibly we
		 * should just drop the association.
		 */
		sdata->local->csa_channel = sdata->local->oper_channel;
	}

	ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

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static void ieee80211_chswitch_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

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	if (sdata->local->quiescing) {
		set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
		return;
	}

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	ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
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}

void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
				      struct ieee80211_channel_sw_ie *sw_elem,
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				      struct ieee80211_bss *bss,
				      u64 timestamp)
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{
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	struct cfg80211_bss *cbss =
		container_of((void *)bss, struct cfg80211_bss, priv);
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	struct ieee80211_channel *new_ch;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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	int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
						      cbss->channel->band);
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	ASSERT_MGD_MTX(ifmgd);

	if (!ifmgd->associated)
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		return;

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	if (sdata->local->scanning)
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		return;

	/* Disregard subsequent beacons if we are already running a timer
	   processing a CSA */

	if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
		return;

	new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
	if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
		return;

	sdata->local->csa_channel = new_ch;

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	if (sdata->local->ops->channel_switch) {
		/* use driver's channel switch callback */
		struct ieee80211_channel_switch ch_switch;
		memset(&ch_switch, 0, sizeof(ch_switch));
		ch_switch.timestamp = timestamp;
		if (sw_elem->mode) {
			ch_switch.block_tx = true;
			ieee80211_stop_queues_by_reason(&sdata->local->hw,
					IEEE80211_QUEUE_STOP_REASON_CSA);
		}
		ch_switch.channel = new_ch;
		ch_switch.count = sw_elem->count;
		ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
		drv_channel_switch(sdata->local, &ch_switch);
		return;
	}

	/* channel switch handled in software */
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	if (sw_elem->count <= 1) {
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		ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
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	} else {
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		if (sw_elem->mode)
			ieee80211_stop_queues_by_reason(&sdata->local->hw,
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					IEEE80211_QUEUE_STOP_REASON_CSA);
		ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
		mod_timer(&ifmgd->chswitch_timer,
			  jiffies +
			  msecs_to_jiffies(sw_elem->count *
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					   cbss->beacon_interval));
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	}
}

static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
					u16 capab_info, u8 *pwr_constr_elem,
					u8 pwr_constr_elem_len)
{
	struct ieee80211_conf *conf = &sdata->local->hw.conf;

	if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
		return;

	/* Power constraint IE length should be 1 octet */
	if (pwr_constr_elem_len != 1)
		return;

	if ((*pwr_constr_elem <= conf->channel->max_power) &&
	    (*pwr_constr_elem != sdata->local->power_constr_level)) {
		sdata->local->power_constr_level = *pwr_constr_elem;
		ieee80211_hw_config(sdata->local, 0);
	}
}

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void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_conf *conf = &local->hw.conf;

	WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
		!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
		(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));

	local->disable_dynamic_ps = false;
	conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
}
EXPORT_SYMBOL(ieee80211_enable_dyn_ps);

void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_conf *conf = &local->hw.conf;

	WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
		!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
		(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));

	local->disable_dynamic_ps = true;
	conf->dynamic_ps_timeout = 0;
	del_timer_sync(&local->dynamic_ps_timer);
	ieee80211_queue_work(&local->hw,
			     &local->dynamic_ps_enable_work);
}
EXPORT_SYMBOL(ieee80211_disable_dyn_ps);

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/* powersave */
static void ieee80211_enable_ps(struct ieee80211_local *local,
				struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_conf *conf = &local->hw.conf;

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	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
579
	if (local->scanning)
J
Johannes Berg 已提交
580 581
		return;

582 583 584 585 586 587 588
	if (conf->dynamic_ps_timeout > 0 &&
	    !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
		mod_timer(&local->dynamic_ps_timer, jiffies +
			  msecs_to_jiffies(conf->dynamic_ps_timeout));
	} else {
		if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
			ieee80211_send_nullfunc(local, sdata, 1);
589

590 591 592 593 594 595
		if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
		    (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
			return;

		conf->flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612
	}
}

static void ieee80211_change_ps(struct ieee80211_local *local)
{
	struct ieee80211_conf *conf = &local->hw.conf;

	if (local->ps_sdata) {
		ieee80211_enable_ps(local, local->ps_sdata);
	} else if (conf->flags & IEEE80211_CONF_PS) {
		conf->flags &= ~IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
		del_timer_sync(&local->dynamic_ps_timer);
		cancel_work_sync(&local->dynamic_ps_enable_work);
	}
}

613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643
static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *mgd = &sdata->u.mgd;
	struct sta_info *sta = NULL;
	u32 sta_flags = 0;

	if (!mgd->powersave)
		return false;

	if (!mgd->associated)
		return false;

	if (!mgd->associated->beacon_ies)
		return false;

	if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
			  IEEE80211_STA_CONNECTION_POLL))
		return false;

	rcu_read_lock();
	sta = sta_info_get(sdata, mgd->bssid);
	if (sta)
		sta_flags = get_sta_flags(sta);
	rcu_read_unlock();

	if (!(sta_flags & WLAN_STA_AUTHORIZED))
		return false;

	return true;
}

644
/* need to hold RTNL or interface lock */
645
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
646 647 648
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
649
	int timeout;
650 651 652 653 654 655

	if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
		local->ps_sdata = NULL;
		return;
	}

J
Johannes Berg 已提交
656 657 658 659 660
	if (!list_empty(&local->work_list)) {
		local->ps_sdata = NULL;
		goto change;
	}

661
	list_for_each_entry(sdata, &local->interfaces, list) {
662
		if (!ieee80211_sdata_running(sdata))
663
			continue;
664 665 666 667 668 669 670 671
		if (sdata->vif.type == NL80211_IFTYPE_AP) {
			/* If an AP vif is found, then disable PS
			 * by setting the count to zero thereby setting
			 * ps_sdata to NULL.
			 */
			count = 0;
			break;
		}
672 673 674 675 676 677
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

678
	if (count == 1 && ieee80211_powersave_allowed(found)) {
679
		struct ieee80211_conf *conf = &local->hw.conf;
680 681 682
		s32 beaconint_us;

		if (latency < 0)
M
Mark Gross 已提交
683
			latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
684 685 686 687

		beaconint_us = ieee80211_tu_to_usec(
					found->vif.bss_conf.beacon_int);

688
		timeout = local->dynamic_ps_forced_timeout;
689 690
		if (timeout < 0) {
			/*
691 692
			 * Go to full PSM if the user configures a very low
			 * latency requirement.
693 694 695
			 * The 2000 second value is there for compatibility
			 * until the PM_QOS_NETWORK_LATENCY is configured
			 * with real values.
696
			 */
697 698
			if (latency > (1900 * USEC_PER_MSEC) &&
			    latency != (2000 * USEC_PER_SEC))
699
				timeout = 0;
700 701
			else
				timeout = 100;
702
		}
703 704 705 706
		local->dynamic_ps_user_timeout = timeout;
		if (!local->disable_dynamic_ps)
			conf->dynamic_ps_timeout =
				local->dynamic_ps_user_timeout;
707

708
		if (beaconint_us > latency) {
709
			local->ps_sdata = NULL;
710
		} else {
711
			struct ieee80211_bss *bss;
712
			int maxslp = 1;
713
			u8 dtimper;
714

715 716 717 718 719 720 721
			bss = (void *)found->u.mgd.associated->priv;
			dtimper = bss->dtim_period;

			/* If the TIM IE is invalid, pretend the value is 1 */
			if (!dtimper)
				dtimper = 1;
			else if (dtimper > 1)
722 723 724
				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

725
			local->hw.conf.max_sleep_period = maxslp;
726
			local->hw.conf.ps_dtim_period = dtimper;
727
			local->ps_sdata = found;
728
		}
729
	} else {
730
		local->ps_sdata = NULL;
731
	}
732

J
Johannes Berg 已提交
733
 change:
734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757
	ieee80211_change_ps(local);
}

void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local,
			     dynamic_ps_disable_work);

	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		local->hw.conf.flags &= ~IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
	}

	ieee80211_wake_queues_by_reason(&local->hw,
					IEEE80211_QUEUE_STOP_REASON_PS);
}

void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local,
			     dynamic_ps_enable_work);
	struct ieee80211_sub_if_data *sdata = local->ps_sdata;
758
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
759 760
	unsigned long flags;
	int q;
761 762 763 764 765 766 767 768

	/* can only happen when PS was just disabled anyway */
	if (!sdata)
		return;

	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786
	/*
	 * transmission can be stopped by others which leads to
	 * dynamic_ps_timer expiry. Postpond the ps timer if it
	 * is not the actual idle state.
	 */
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	for (q = 0; q < local->hw.queues; q++) {
		if (local->queue_stop_reasons[q]) {
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
	}
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);

787
	if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
788 789
	    (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
		netif_tx_stop_all_queues(sdata->dev);
790

791 792 793 794 795 796 797 798 799
		if (drv_tx_frames_pending(local))
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
		else {
			ieee80211_send_nullfunc(local, sdata, 1);
			/* Flush to get the tx status of nullfunc frame */
			drv_flush(local, false);
		}
800 801
	}

802 803
	if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
	      (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
804 805 806 807 808
	    (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
		local->hw.conf.flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
	}
809

810
	netif_tx_wake_all_queues(sdata->dev);
811 812 813 814 815 816
}

void ieee80211_dynamic_ps_timer(unsigned long data)
{
	struct ieee80211_local *local = (void *) data;

817
	if (local->quiescing || local->suspended)
818 819
		return;

820
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
821 822
}

J
Johannes Berg 已提交
823
/* MLME */
824
static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
825
				     struct ieee80211_sub_if_data *sdata,
826 827 828
				     u8 *wmm_param, size_t wmm_param_len)
{
	struct ieee80211_tx_queue_params params;
829
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
830 831
	size_t left;
	int count;
K
Kalle Valo 已提交
832
	u8 *pos, uapsd_queues = 0;
833

834 835 836
	if (!local->ops->conf_tx)
		return;

J
Johannes Berg 已提交
837
	if (local->hw.queues < 4)
838 839 840 841 842
		return;

	if (!wmm_param)
		return;

843 844
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
		return;
K
Kalle Valo 已提交
845 846

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
847
		uapsd_queues = local->uapsd_queues;
K
Kalle Valo 已提交
848

849
	count = wmm_param[6] & 0x0f;
850
	if (count == ifmgd->wmm_last_param_set)
851
		return;
852
	ifmgd->wmm_last_param_set = count;
853 854 855 856 857 858 859 860 861 862

	pos = wmm_param + 8;
	left = wmm_param_len - 8;

	memset(&params, 0, sizeof(params));

	local->wmm_acm = 0;
	for (; left >= 4; left -= 4, pos += 4) {
		int aci = (pos[0] >> 5) & 0x03;
		int acm = (pos[0] >> 4) & 0x01;
K
Kalle Valo 已提交
863
		bool uapsd = false;
864 865 866
		int queue;

		switch (aci) {
867
		case 1: /* AC_BK */
J
Johannes Berg 已提交
868
			queue = 3;
J
Johannes Berg 已提交
869
			if (acm)
870
				local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
K
Kalle Valo 已提交
871 872
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
873
			break;
874
		case 2: /* AC_VI */
J
Johannes Berg 已提交
875
			queue = 1;
J
Johannes Berg 已提交
876
			if (acm)
877
				local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
K
Kalle Valo 已提交
878 879
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
880
			break;
881
		case 3: /* AC_VO */
J
Johannes Berg 已提交
882
			queue = 0;
J
Johannes Berg 已提交
883
			if (acm)
884
				local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
K
Kalle Valo 已提交
885 886
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
887
			break;
888
		case 0: /* AC_BE */
889
		default:
J
Johannes Berg 已提交
890
			queue = 2;
J
Johannes Berg 已提交
891
			if (acm)
892
				local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
K
Kalle Valo 已提交
893 894
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
895 896 897 898 899 900
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
901
		params.txop = get_unaligned_le16(pos + 2);
K
Kalle Valo 已提交
902 903
		params.uapsd = uapsd;

904
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
J
Joe Perches 已提交
905 906 907 908 909 910
		wiphy_debug(local->hw.wiphy,
			    "WMM queue=%d aci=%d acm=%d aifs=%d "
			    "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
			    queue, aci, acm,
			    params.aifs, params.cw_min, params.cw_max,
			    params.txop, params.uapsd);
911
#endif
912
		if (drv_conf_tx(local, queue, &params))
J
Joe Perches 已提交
913 914 915
			wiphy_debug(local->hw.wiphy,
				    "failed to set TX queue parameters for queue %d\n",
				    queue);
916
	}
917 918

	/* enable WMM or activate new settings */
919 920
	sdata->vif.bss_conf.qos = true;
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
921 922
}

J
Johannes Berg 已提交
923 924
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
925
{
J
Johannes Berg 已提交
926
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
927
	u32 changed = 0;
J
Johannes Berg 已提交
928 929 930 931 932 933 934 935 936 937 938 939 940
	bool use_protection;
	bool use_short_preamble;
	bool use_short_slot;

	if (erp_valid) {
		use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
		use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
	} else {
		use_protection = false;
		use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
	}

	use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
941 942
	if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
		use_short_slot = true;
943

944 945 946
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
947
	}
948

949 950
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
951
		changed |= BSS_CHANGED_ERP_PREAMBLE;
952
	}
953

J
Johannes Berg 已提交
954 955 956
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
957 958 959 960 961
	}

	return changed;
}

962
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
963
				     struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
964
				     u32 bss_info_changed)
965
{
966
	struct ieee80211_bss *bss = (void *)cbss->priv;
967
	struct ieee80211_local *local = sdata->local;
968
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
969

J
Johannes Berg 已提交
970
	bss_info_changed |= BSS_CHANGED_ASSOC;
971
	/* set timing information */
972 973
	bss_conf->beacon_int = cbss->beacon_interval;
	bss_conf->timestamp = cbss->tsf;
974

975 976
	bss_info_changed |= BSS_CHANGED_BEACON_INT;
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
977
		cbss->capability, bss->has_erp_value, bss->erp_value);
978

979 980 981
	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
		IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));

982 983
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
984

985 986
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

J
Johannes Berg 已提交
987 988 989 990
	/* just to be sure */
	sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
				IEEE80211_STA_BEACON_POLL);

991
	ieee80211_led_assoc(local, 1);
992

993 994 995 996 997
	if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
		bss_conf->dtim_period = bss->dtim_period;
	else
		bss_conf->dtim_period = 0;

998
	bss_conf->assoc = 1;
999 1000 1001 1002 1003
	/*
	 * For now just always ask the driver to update the basic rateset
	 * when we have associated, we aren't checking whether it actually
	 * changed or not.
	 */
J
Johannes Berg 已提交
1004
	bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1005 1006 1007 1008

	/* And the BSSID changed - we're associated now */
	bss_info_changed |= BSS_CHANGED_BSSID;

1009 1010
	/* Tell the driver to monitor connection quality (if supported) */
	if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1011
	    bss_conf->cqm_rssi_thold)
1012 1013
		bss_info_changed |= BSS_CHANGED_CQM;

1014 1015 1016 1017 1018 1019
	/* Enable ARP filtering */
	if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
		bss_conf->arp_filter_enabled = sdata->arp_filter_state;
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;
	}

J
Johannes Berg 已提交
1020
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1021

J
Johannes Berg 已提交
1022 1023
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
1024
	ieee80211_recalc_smps(local);
J
Johannes Berg 已提交
1025
	mutex_unlock(&local->iflist_mtx);
1026

1027
	netif_tx_start_all_queues(sdata->dev);
1028
	netif_carrier_on(sdata->dev);
1029 1030
}

1031
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1032
				   bool remove_sta, bool tx)
1033
{
1034
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1035 1036
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
1037
	u32 changed = 0, config_changed = 0;
J
Johannes Berg 已提交
1038
	u8 bssid[ETH_ALEN];
1039

1040 1041
	ASSERT_MGD_MTX(ifmgd);

J
Johannes Berg 已提交
1042 1043 1044
	if (WARN_ON(!ifmgd->associated))
		return;

1045
	memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
J
Johannes Berg 已提交
1046

1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062
	ifmgd->associated = NULL;
	memset(ifmgd->bssid, 0, ETH_ALEN);

	/*
	 * we need to commit the associated = NULL change because the
	 * scan code uses that to determine whether this iface should
	 * go to/wake up from powersave or not -- and could otherwise
	 * wake the queues erroneously.
	 */
	smp_mb();

	/*
	 * Thus, we can only afterwards stop the queues -- to account
	 * for the case where another CPU is finishing a scan at this
	 * time -- we don't want the scan code to enable queues.
	 */
1063

1064
	netif_tx_stop_all_queues(sdata->dev);
1065 1066
	netif_carrier_off(sdata->dev);

1067
	mutex_lock(&local->sta_mtx);
1068
	sta = sta_info_get(sdata, bssid);
1069
	if (sta) {
1070
		set_sta_flags(sta, WLAN_STA_BLOCK_BA);
1071
		ieee80211_sta_tear_down_BA_sessions(sta, tx);
1072
	}
1073
	mutex_unlock(&local->sta_mtx);
1074

1075 1076 1077
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
J
Johannes Berg 已提交
1078 1079
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
1080

1081 1082
	ieee80211_set_wmm_default(sdata);

1083
	/* channel(_type) changes are handled by ieee80211_hw_config */
1084
	WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1085

1086 1087 1088
	/* on the next assoc, re-program HT parameters */
	sdata->ht_opmode_valid = false;

1089 1090
	local->power_constr_level = 0;

1091 1092 1093
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

1094 1095 1096 1097
	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		local->hw.conf.flags &= ~IEEE80211_CONF_PS;
		config_changed |= IEEE80211_CONF_CHANGE_PS;
	}
J
Johannes Berg 已提交
1098

1099
	ieee80211_hw_config(local, config_changed);
1100

1101 1102 1103 1104 1105 1106
	/* Disable ARP filtering */
	if (sdata->vif.bss_conf.arp_filter_enabled) {
		sdata->vif.bss_conf.arp_filter_enabled = false;
		changed |= BSS_CHANGED_ARP_FILTER;
	}

1107 1108
	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
J
Johannes Berg 已提交
1109
	ieee80211_bss_info_change_notify(sdata, changed);
1110

1111 1112
	if (remove_sta)
		sta_info_destroy_addr(sdata, bssid);
1113 1114 1115 1116 1117

	del_timer_sync(&sdata->u.mgd.conn_mon_timer);
	del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
	del_timer_sync(&sdata->u.mgd.timer);
	del_timer_sync(&sdata->u.mgd.chswitch_timer);
1118
}
1119

1120 1121 1122 1123 1124 1125 1126 1127
void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
			     struct ieee80211_hdr *hdr)
{
	/*
	 * We can postpone the mgd.timer whenever receiving unicast frames
	 * from AP because we know that the connection is working both ways
	 * at that time. But multicast frames (and hence also beacons) must
	 * be ignored here, because we need to trigger the timer during
J
Johannes Berg 已提交
1128 1129
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
1130
	 */
J
Johannes Berg 已提交
1131 1132 1133
	if (is_multicast_ether_addr(hdr->addr1))
		return;

1134
	ieee80211_sta_reset_conn_monitor(sdata);
1135
}
1136

1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

	if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
			      IEEE80211_STA_CONNECTION_POLL)))
	    return;

	ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
			  IEEE80211_STA_BEACON_POLL);
	mutex_lock(&sdata->local->iflist_mtx);
	ieee80211_recalc_ps(sdata->local, -1);
	mutex_unlock(&sdata->local->iflist_mtx);

	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
		return;

	/*
	 * We've received a probe response, but are not sure whether
	 * we have or will be receiving any beacons or data, so let's
	 * schedule the timers again, just in case.
	 */
	ieee80211_sta_reset_beacon_monitor(sdata);

	mod_timer(&ifmgd->conn_mon_timer,
		  round_jiffies_up(jiffies +
				   IEEE80211_CONNECTION_IDLE_TIME));
}

void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1167
			     struct ieee80211_hdr *hdr, bool ack)
1168
{
F
Felix Fietkau 已提交
1169
	if (!ieee80211_is_data(hdr->frame_control))
1170 1171
	    return;

1172 1173
	if (ack)
		ieee80211_sta_reset_conn_monitor(sdata);
1174 1175 1176

	if (ieee80211_is_nullfunc(hdr->frame_control) &&
	    sdata->u.mgd.probe_send_count > 0) {
1177 1178 1179 1180
		if (ack)
			sdata->u.mgd.probe_send_count = 0;
		else
			sdata->u.mgd.nullfunc_failed = true;
1181 1182 1183 1184
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
	}
}

1185 1186 1187 1188
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;
1189
	u8 *dst = ifmgd->associated->bssid;
1190
	u8 unicast_limit = max(1, max_probe_tries - 3);
1191 1192 1193 1194 1195 1196 1197 1198

	/*
	 * Try sending broadcast probe requests for the last three
	 * probe requests after the first ones failed since some
	 * buggy APs only support broadcast probe requests.
	 */
	if (ifmgd->probe_send_count >= unicast_limit)
		dst = NULL;
1199

1200 1201 1202 1203 1204 1205 1206
	/*
	 * When the hardware reports an accurate Tx ACK status, it's
	 * better to send a nullfunc frame instead of a probe request,
	 * as it will kick us off the AP quickly if we aren't associated
	 * anymore. The timeout will be reset if the frame is ACKed by
	 * the AP.
	 */
1207 1208
	if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
		ifmgd->nullfunc_failed = false;
1209
		ieee80211_send_nullfunc(sdata->local, sdata, 0);
1210
	} else {
1211 1212 1213
		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
		ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0);
	}
1214 1215

	ifmgd->probe_send_count++;
1216
	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1217 1218 1219
	run_again(ifmgd, ifmgd->probe_timeout);
}

J
Johannes Berg 已提交
1220 1221
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
1222 1223
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
1224
	bool already = false;
1225

1226
	if (!ieee80211_sdata_running(sdata))
1227 1228
		return;

1229 1230 1231
	if (sdata->local->scanning)
		return;

1232 1233 1234
	if (sdata->local->tmp_channel)
		return;

1235 1236 1237 1238 1239
	mutex_lock(&ifmgd->mtx);

	if (!ifmgd->associated)
		goto out;

1240
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
J
Johannes Berg 已提交
1241 1242
	if (beacon && net_ratelimit())
		printk(KERN_DEBUG "%s: detected beacon loss from AP "
1243
		       "- sending probe request\n", sdata->name);
1244
#endif
1245

J
Johannes Berg 已提交
1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268
	/*
	 * The driver/our work has already reported this event or the
	 * connection monitoring has kicked in and we have already sent
	 * a probe request. Or maybe the AP died and the driver keeps
	 * reporting until we disassociate...
	 *
	 * In either case we have to ignore the current call to this
	 * function (except for setting the correct probe reason bit)
	 * because otherwise we would reset the timer every time and
	 * never check whether we received a probe response!
	 */
	if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
			    IEEE80211_STA_CONNECTION_POLL))
		already = true;

	if (beacon)
		ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
	else
		ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

	if (already)
		goto out;

1269 1270 1271 1272
	mutex_lock(&sdata->local->iflist_mtx);
	ieee80211_recalc_ps(sdata->local, -1);
	mutex_unlock(&sdata->local->iflist_mtx);

1273 1274
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
1275 1276
 out:
	mutex_unlock(&ifmgd->mtx);
1277 1278
}

1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
					  struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct sk_buff *skb;
	const u8 *ssid;

	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
		return NULL;

	ASSERT_MGD_MTX(ifmgd);

	if (!ifmgd->associated)
		return NULL;

	ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
	skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
					ssid + 2, ssid[1], NULL, 0);

	return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316
static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_local *local = sdata->local;
	u8 bssid[ETH_ALEN];

	mutex_lock(&ifmgd->mtx);
	if (!ifmgd->associated) {
		mutex_unlock(&ifmgd->mtx);
		return;
	}

	memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);

1317 1318
	printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
	       sdata->name, bssid);
1319

1320
	ieee80211_set_disassoc(sdata, true, true);
1321
	mutex_unlock(&ifmgd->mtx);
1322 1323 1324 1325

	mutex_lock(&local->mtx);
	ieee80211_recalc_idle(local);
	mutex_unlock(&local->mtx);
1326 1327 1328 1329 1330 1331 1332
	/*
	 * must be outside lock due to cfg80211,
	 * but that's not a problem.
	 */
	ieee80211_send_deauth_disassoc(sdata, bssid,
				       IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1333
				       NULL, true);
1334 1335 1336
}

void ieee80211_beacon_connection_loss_work(struct work_struct *work)
J
Johannes Berg 已提交
1337 1338 1339
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
1340
			     u.mgd.beacon_connection_loss_work);
J
Johannes Berg 已提交
1341

1342 1343 1344 1345
	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
		__ieee80211_connection_loss(sdata);
	else
		ieee80211_mgd_probe_ap(sdata, true);
J
Johannes Berg 已提交
1346 1347
}

1348 1349 1350
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1351
	struct ieee80211_hw *hw = &sdata->local->hw;
1352

J
Johannes Berg 已提交
1353 1354
	trace_api_beacon_loss(sdata);

1355 1356
	WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1357 1358 1359
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

1360 1361 1362 1363 1364
void ieee80211_connection_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_hw *hw = &sdata->local->hw;

J
Johannes Berg 已提交
1365 1366
	trace_api_connection_loss(sdata);

1367 1368 1369 1370 1371 1372
	WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


1373 1374 1375
static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
			 struct ieee80211_mgmt *mgmt, size_t len)
1376
{
1377
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1378
	const u8 *bssid = NULL;
1379 1380
	u16 reason_code;

1381
	if (len < 24 + 2)
1382
		return RX_MGMT_NONE;
1383

1384 1385
	ASSERT_MGD_MTX(ifmgd);

1386
	bssid = ifmgd->associated->bssid;
1387 1388 1389

	reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);

1390
	printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1391
			sdata->name, bssid, reason_code);
1392

1393
	ieee80211_set_disassoc(sdata, true, false);
1394
	mutex_lock(&sdata->local->mtx);
1395
	ieee80211_recalc_idle(sdata->local);
1396
	mutex_unlock(&sdata->local->mtx);
1397

1398
	return RX_MGMT_CFG80211_DEAUTH;
1399 1400 1401
}


1402 1403 1404
static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
			   struct ieee80211_mgmt *mgmt, size_t len)
1405
{
1406
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1407 1408
	u16 reason_code;

1409
	if (len < 24 + 2)
1410
		return RX_MGMT_NONE;
1411

1412 1413 1414 1415 1416
	ASSERT_MGD_MTX(ifmgd);

	if (WARN_ON(!ifmgd->associated))
		return RX_MGMT_NONE;

1417
	if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1418
		return RX_MGMT_NONE;
1419 1420 1421

	reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);

1422
	printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1423
			sdata->name, mgmt->sa, reason_code);
1424

1425
	ieee80211_set_disassoc(sdata, true, false);
1426
	mutex_lock(&sdata->local->mtx);
1427
	ieee80211_recalc_idle(sdata->local);
1428
	mutex_unlock(&sdata->local->mtx);
1429
	return RX_MGMT_CFG80211_DISASSOC;
1430 1431 1432
}


J
Johannes Berg 已提交
1433 1434
static bool ieee80211_assoc_success(struct ieee80211_work *wk,
				    struct ieee80211_mgmt *mgmt, size_t len)
1435
{
J
Johannes Berg 已提交
1436
	struct ieee80211_sub_if_data *sdata = wk->sdata;
1437
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1438
	struct ieee80211_local *local = sdata->local;
1439
	struct ieee80211_supported_band *sband;
1440
	struct sta_info *sta;
1441
	struct cfg80211_bss *cbss = wk->assoc.bss;
J
Johannes Berg 已提交
1442
	u8 *pos;
1443
	u32 rates, basic_rates;
J
Johannes Berg 已提交
1444
	u16 capab_info, aid;
1445
	struct ieee802_11_elems elems;
J
Johannes Berg 已提交
1446
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
J
Johannes Berg 已提交
1447
	u32 changed = 0;
1448 1449
	int i, j, err;
	bool have_higher_than_11mbit = false;
J
Johannes Berg 已提交
1450
	u16 ap_ht_cap_flags;
1451

J
Johannes Berg 已提交
1452
	/* AssocResp and ReassocResp have identical structure */
1453 1454

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
J
Johannes Berg 已提交
1455
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1456

1457 1458
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
		printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1459
		       "set\n", sdata->name, aid);
1460 1461
	aid &= ~(BIT(15) | BIT(14));

J
Johannes Berg 已提交
1462 1463 1464
	pos = mgmt->u.assoc_resp.variable;
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);

1465 1466
	if (!elems.supp_rates) {
		printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1467
		       sdata->name);
J
Johannes Berg 已提交
1468
		return false;
1469 1470
	}

1471
	ifmgd->aid = aid;
1472

1473
	sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1474
	if (!sta) {
1475 1476
		printk(KERN_DEBUG "%s: failed to alloc STA entry for"
		       " the AP\n", sdata->name);
J
Johannes Berg 已提交
1477
		return false;
1478
	}
1479

1480 1481 1482 1483 1484
	set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
			   WLAN_STA_ASSOC_AP);
	if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
		set_sta_flags(sta, WLAN_STA_AUTHORIZED);

J
Johannes Berg 已提交
1485 1486
	rates = 0;
	basic_rates = 0;
1487
	sband = local->hw.wiphy->bands[wk->chan->band];
1488

J
Johannes Berg 已提交
1489 1490
	for (i = 0; i < elems.supp_rates_len; i++) {
		int rate = (elems.supp_rates[i] & 0x7f) * 5;
1491
		bool is_basic = !!(elems.supp_rates[i] & 0x80);
1492

J
Johannes Berg 已提交
1493 1494 1495 1496
		if (rate > 110)
			have_higher_than_11mbit = true;

		for (j = 0; j < sband->n_bitrates; j++) {
1497
			if (sband->bitrates[j].bitrate == rate) {
J
Johannes Berg 已提交
1498
				rates |= BIT(j);
1499 1500 1501 1502
				if (is_basic)
					basic_rates |= BIT(j);
				break;
			}
1503 1504 1505
		}
	}

J
Johannes Berg 已提交
1506 1507
	for (i = 0; i < elems.ext_supp_rates_len; i++) {
		int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1508
		bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1509

J
Johannes Berg 已提交
1510 1511
		if (rate > 110)
			have_higher_than_11mbit = true;
1512

J
Johannes Berg 已提交
1513
		for (j = 0; j < sband->n_bitrates; j++) {
1514
			if (sband->bitrates[j].bitrate == rate) {
J
Johannes Berg 已提交
1515
				rates |= BIT(j);
1516 1517 1518 1519
				if (is_basic)
					basic_rates |= BIT(j);
				break;
			}
J
Johannes Berg 已提交
1520
		}
1521
	}
1522

1523
	sta->sta.supp_rates[wk->chan->band] = rates;
J
Johannes Berg 已提交
1524
	sdata->vif.bss_conf.basic_rates = basic_rates;
J
Johannes Berg 已提交
1525 1526

	/* cf. IEEE 802.11 9.2.12 */
1527
	if (wk->chan->band == IEEE80211_BAND_2GHZ &&
J
Johannes Berg 已提交
1528 1529 1530 1531
	    have_higher_than_11mbit)
		sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
	else
		sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1532

1533
	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
J
Johannes Berg 已提交
1534
		ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
J
Johannes Berg 已提交
1535
				elems.ht_cap_elem, &sta->sta.ht_cap);
J
Johannes Berg 已提交
1536 1537

	ap_ht_cap_flags = sta->sta.ht_cap.cap;
1538

1539
	rate_control_rate_init(sta);
1540

1541
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1542 1543
		set_sta_flags(sta, WLAN_STA_MFP);

1544
	if (elems.wmm_param)
J
Johannes Berg 已提交
1545
		set_sta_flags(sta, WLAN_STA_WME);
1546

1547 1548 1549 1550 1551
	err = sta_info_insert(sta);
	sta = NULL;
	if (err) {
		printk(KERN_DEBUG "%s: failed to insert STA entry for"
		       " the AP (error %d)\n", sdata->name, err);
1552
		return false;
1553 1554
	}

1555 1556 1557 1558 1559 1560 1561 1562
	/*
	 * Always handle WMM once after association regardless
	 * of the first value the AP uses. Setting -1 here has
	 * that effect because the AP values is an unsigned
	 * 4-bit value.
	 */
	ifmgd->wmm_last_param_set = -1;

1563
	if (elems.wmm_param)
1564
		ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
J
Johannes Berg 已提交
1565
					 elems.wmm_param_len);
1566 1567
	else
		ieee80211_set_wmm_default(sdata);
1568

1569 1570
	local->oper_channel = wk->chan;

J
Johannes Berg 已提交
1571
	if (elems.ht_info_elem && elems.wmm_param &&
J
Johannes Berg 已提交
1572
	    (sdata->local->hw.queues >= 4) &&
1573
	    !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
J
Johannes Berg 已提交
1574
		changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1575
					       cbss->bssid, ap_ht_cap_flags);
J
Johannes Berg 已提交
1576

J
Johannes Berg 已提交
1577 1578 1579 1580
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
1581
	ieee80211_set_associated(sdata, cbss, changed);
1582

1583 1584 1585 1586 1587 1588 1589
	/*
	 * If we're using 4-addr mode, let the AP know that we're
	 * doing so, so that it can create the STA VLAN on its side
	 */
	if (ifmgd->use_4addr)
		ieee80211_send_4addr_nullfunc(local, sdata);

1590
	/*
J
Johannes Berg 已提交
1591 1592
	 * Start timer to probe the connection to the AP now.
	 * Also start the timer that will detect beacon loss.
1593
	 */
J
Johannes Berg 已提交
1594
	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1595
	ieee80211_sta_reset_beacon_monitor(sdata);
1596

J
Johannes Berg 已提交
1597
	return true;
1598 1599 1600
}


1601 1602 1603 1604 1605 1606 1607 1608 1609
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
				  struct ieee80211_mgmt *mgmt,
				  size_t len,
				  struct ieee80211_rx_status *rx_status,
				  struct ieee802_11_elems *elems,
				  bool beacon)
{
	struct ieee80211_local *local = sdata->local;
	int freq;
1610
	struct ieee80211_bss *bss;
1611
	struct ieee80211_channel *channel;
1612 1613 1614 1615 1616 1617 1618
	bool need_ps = false;

	if (sdata->u.mgd.associated) {
		bss = (void *)sdata->u.mgd.associated->priv;
		/* not previously set so we may need to recalc */
		need_ps = !bss->dtim_period;
	}
1619 1620

	if (elems->ds_params && elems->ds_params_len == 1)
1621 1622
		freq = ieee80211_channel_to_frequency(elems->ds_params[0],
						      rx_status->band);
1623 1624 1625 1626 1627 1628 1629 1630 1631
	else
		freq = rx_status->freq;

	channel = ieee80211_get_channel(local->hw.wiphy, freq);

	if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
		return;

	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1632
					channel, beacon);
1633 1634 1635 1636
	if (bss)
		ieee80211_rx_bss_put(local, bss);

	if (!sdata->u.mgd.associated)
1637 1638
		return;

1639 1640 1641 1642 1643 1644
	if (need_ps) {
		mutex_lock(&local->iflist_mtx);
		ieee80211_recalc_ps(local, -1);
		mutex_unlock(&local->iflist_mtx);
	}

S
Sujith 已提交
1645
	if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1646
	    (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1647
							ETH_ALEN) == 0)) {
S
Sujith 已提交
1648 1649
		struct ieee80211_channel_sw_ie *sw_elem =
			(struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1650 1651
		ieee80211_sta_process_chanswitch(sdata, sw_elem,
						 bss, rx_status->mactime);
S
Sujith 已提交
1652
	}
1653 1654 1655
}


1656
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1657
					 struct sk_buff *skb)
1658
{
J
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1659
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
1660
	struct ieee80211_if_managed *ifmgd;
J
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1661 1662
	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
	size_t baselen, len = skb->len;
1663 1664
	struct ieee802_11_elems elems;

1665 1666
	ifmgd = &sdata->u.mgd;

1667 1668
	ASSERT_MGD_MTX(ifmgd);

1669
	if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1670 1671
		return; /* ignore ProbeResp to foreign address */

1672 1673 1674 1675 1676 1677 1678
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
				&elems);

1679
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1680

1681
	if (ifmgd->associated &&
1682 1683
	    memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
		ieee80211_reset_ap_probe(sdata);
1684 1685
}

1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699
/*
 * This is the canonical list of information elements we care about,
 * the filter code also gives us all changes to the Microsoft OUI
 * (00:50:F2) vendor IE which is used for WMM which we need to track.
 *
 * We implement beacon filtering in software since that means we can
 * avoid processing the frame here and in cfg80211, and userspace
 * will not be able to tell whether the hardware supports it or not.
 *
 * XXX: This list needs to be dynamic -- userspace needs to be able to
 *	add items it requires. It also needs to be able to tell us to
 *	look out for other vendor IEs.
 */
static const u64 care_about_ies =
1700 1701 1702 1703 1704 1705
	(1ULL << WLAN_EID_COUNTRY) |
	(1ULL << WLAN_EID_ERP_INFO) |
	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
	(1ULL << WLAN_EID_HT_CAPABILITY) |
	(1ULL << WLAN_EID_HT_INFORMATION);
1706

1707
static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1708 1709 1710 1711
				     struct ieee80211_mgmt *mgmt,
				     size_t len,
				     struct ieee80211_rx_status *rx_status)
{
1712
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1713
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1714 1715
	size_t baselen;
	struct ieee802_11_elems elems;
1716
	struct ieee80211_local *local = sdata->local;
1717
	u32 changed = 0;
1718
	bool erp_valid, directed_tim = false;
J
Johannes Berg 已提交
1719
	u8 erp_value = 0;
1720
	u32 ncrc;
1721 1722 1723
	u8 *bssid;

	ASSERT_MGD_MTX(ifmgd);
1724

1725 1726 1727 1728 1729
	/* Process beacon from the current BSS */
	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

1730
	if (rx_status->freq != local->hw.conf.channel->center_freq)
1731 1732
		return;

J
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1733 1734 1735 1736 1737
	/*
	 * We might have received a number of frames, among them a
	 * disassoc frame and a beacon...
	 */
	if (!ifmgd->associated)
1738 1739
		return;

1740
	bssid = ifmgd->associated->bssid;
1741

J
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1742 1743 1744 1745 1746
	/*
	 * And in theory even frames from a different AP we were just
	 * associated to a split-second ago!
	 */
	if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1747 1748
		return;

1749 1750 1751 1752
	/* Track average RSSI from the Beacon frames of the current AP */
	ifmgd->last_beacon_signal = rx_status->signal;
	if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
		ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1753
		ifmgd->ave_beacon_signal = rx_status->signal * 16;
1754
		ifmgd->last_cqm_event_signal = 0;
1755
		ifmgd->count_beacon_signal = 1;
1756 1757 1758 1759 1760
	} else {
		ifmgd->ave_beacon_signal =
			(IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
			 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
			 ifmgd->ave_beacon_signal) / 16;
1761
		ifmgd->count_beacon_signal++;
1762 1763
	}
	if (bss_conf->cqm_rssi_thold &&
1764
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786
	    !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
		int sig = ifmgd->ave_beacon_signal / 16;
		int last_event = ifmgd->last_cqm_event_signal;
		int thold = bss_conf->cqm_rssi_thold;
		int hyst = bss_conf->cqm_rssi_hyst;
		if (sig < thold &&
		    (last_event == 0 || sig < last_event - hyst)) {
			ifmgd->last_cqm_event_signal = sig;
			ieee80211_cqm_rssi_notify(
				&sdata->vif,
				NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
				GFP_KERNEL);
		} else if (sig > thold &&
			   (last_event == 0 || sig > last_event + hyst)) {
			ifmgd->last_cqm_event_signal = sig;
			ieee80211_cqm_rssi_notify(
				&sdata->vif,
				NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
				GFP_KERNEL);
		}
	}

J
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1787
	if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1788 1789 1790
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: cancelling probereq poll due "
1791
			       "to a received beacon\n", sdata->name);
1792 1793
		}
#endif
J
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1794
		ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1795 1796 1797
		mutex_lock(&local->iflist_mtx);
		ieee80211_recalc_ps(local, -1);
		mutex_unlock(&local->iflist_mtx);
1798 1799
	}

J
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1800 1801 1802 1803
	/*
	 * Push the beacon loss detection into the future since
	 * we are processing a beacon from the AP just now.
	 */
1804
	ieee80211_sta_reset_beacon_monitor(sdata);
J
Johannes Berg 已提交
1805

1806 1807 1808 1809 1810 1811
	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
					  len - baselen, &elems,
					  care_about_ies, ncrc);

	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1812 1813
		directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
						   ifmgd->aid);
1814

1815
	if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1816 1817
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
				      true);
1818

1819
		ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1820 1821
					 elems.wmm_param_len);
	}
1822

1823
	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1824
		if (directed_tim) {
1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842
			if (local->hw.conf.dynamic_ps_timeout > 0) {
				local->hw.conf.flags &= ~IEEE80211_CONF_PS;
				ieee80211_hw_config(local,
						    IEEE80211_CONF_CHANGE_PS);
				ieee80211_send_nullfunc(local, sdata, 0);
			} else {
				local->pspolling = true;

				/*
				 * Here is assumed that the driver will be
				 * able to send ps-poll frame and receive a
				 * response even though power save mode is
				 * enabled, but some drivers might require
				 * to disable power save here. This needs
				 * to be investigated.
				 */
				ieee80211_send_pspoll(local, sdata);
			}
1843 1844
		}
	}
J
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1845

1846
	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1847 1848
		return;
	ifmgd->beacon_crc = ncrc;
1849
	ifmgd->beacon_crc_valid = true;
1850

J
Johannes Berg 已提交
1851 1852 1853 1854 1855
	if (elems.erp_info && elems.erp_info_len >= 1) {
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
1856
	}
J
Johannes Berg 已提交
1857 1858 1859
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
1860

1861

1862
	if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1863
	    !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
J
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1864 1865 1866 1867 1868 1869
		struct sta_info *sta;
		struct ieee80211_supported_band *sband;
		u16 ap_ht_cap_flags;

		rcu_read_lock();

1870
		sta = sta_info_get(sdata, bssid);
1871
		if (WARN_ON(!sta)) {
J
Johannes Berg 已提交
1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885
			rcu_read_unlock();
			return;
		}

		sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

		ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
				elems.ht_cap_elem, &sta->sta.ht_cap);

		ap_ht_cap_flags = sta->sta.ht_cap.cap;

		rcu_read_unlock();

		changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1886
					       bssid, ap_ht_cap_flags);
1887 1888
	}

1889
	/* Note: country IE parsing is done for us by cfg80211 */
1890
	if (elems.country_elem) {
1891 1892 1893 1894 1895 1896
		/* TODO: IBSS also needs this */
		if (elems.pwr_constr_elem)
			ieee80211_handle_pwr_constr(sdata,
				le16_to_cpu(mgmt->u.probe_resp.capab_info),
				elems.pwr_constr_elem,
				elems.pwr_constr_elem_len);
1897 1898
	}

1899
	ieee80211_bss_info_change_notify(sdata, changed);
1900 1901
}

1902 1903
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				  struct sk_buff *skb)
1904
{
1905
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1906 1907
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
1908
	enum rx_mgmt_action rma = RX_MGMT_NONE;
1909 1910 1911 1912 1913 1914
	u16 fc;

	rx_status = (struct ieee80211_rx_status *) skb->cb;
	mgmt = (struct ieee80211_mgmt *) skb->data;
	fc = le16_to_cpu(mgmt->frame_control);

1915 1916 1917
	mutex_lock(&ifmgd->mtx);

	if (ifmgd->associated &&
1918
	    memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1919 1920 1921 1922 1923 1924
		switch (fc & IEEE80211_FCTL_STYPE) {
		case IEEE80211_STYPE_BEACON:
			ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
						 rx_status);
			break;
		case IEEE80211_STYPE_PROBE_RESP:
J
Johannes Berg 已提交
1925
			ieee80211_rx_mgmt_probe_resp(sdata, skb);
1926 1927
			break;
		case IEEE80211_STYPE_DEAUTH:
1928
			rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1929 1930 1931 1932 1933
			break;
		case IEEE80211_STYPE_DISASSOC:
			rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
			break;
		case IEEE80211_STYPE_ACTION:
1934 1935 1936 1937 1938 1939 1940 1941
			switch (mgmt->u.action.category) {
			case WLAN_CATEGORY_SPECTRUM_MGMT:
				ieee80211_sta_process_chanswitch(sdata,
						&mgmt->u.action.u.chan_switch.sw_elem,
						(void *)ifmgd->associated->priv,
						rx_status->mactime);
				break;
			}
1942 1943 1944 1945 1946 1947 1948 1949
		}
		mutex_unlock(&ifmgd->mtx);

		switch (rma) {
		case RX_MGMT_NONE:
			/* no action */
			break;
		case RX_MGMT_CFG80211_DEAUTH:
1950
			cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1951 1952
			break;
		case RX_MGMT_CFG80211_DISASSOC:
1953
			cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1954 1955 1956 1957
			break;
		default:
			WARN(1, "unexpected: %d", rma);
		}
1958
		return;
1959 1960 1961 1962
	}

	mutex_unlock(&ifmgd->mtx);

1963
	if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1964 1965 1966 1967
	    (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
		struct ieee80211_local *local = sdata->local;
		struct ieee80211_work *wk;

1968
		mutex_lock(&local->mtx);
1969 1970 1971 1972
		list_for_each_entry(wk, &local->work_list, list) {
			if (wk->sdata != sdata)
				continue;

1973 1974
			if (wk->type != IEEE80211_WORK_ASSOC &&
			    wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
				continue;

			if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
				continue;
			if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
				continue;

			/*
			 * Printing the message only here means we can't
			 * spuriously print it, but it also means that it
			 * won't be printed when the frame comes in before
			 * we even tried to associate or in similar cases.
			 *
			 * Ultimately, I suspect cfg80211 should print the
			 * messages instead.
			 */
			printk(KERN_DEBUG
			       "%s: deauthenticated from %pM (Reason: %u)\n",
			       sdata->name, mgmt->bssid,
			       le16_to_cpu(mgmt->u.deauth.reason_code));

			list_del_rcu(&wk->list);
			free_work(wk);
			break;
		}
2000
		mutex_unlock(&local->mtx);
2001

2002
		cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2003
	}
2004 2005
}

J
Johannes Berg 已提交
2006
static void ieee80211_sta_timer(unsigned long data)
2007
{
J
Johannes Berg 已提交
2008 2009
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
2010
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
2011
	struct ieee80211_local *local = sdata->local;
2012

2013 2014 2015 2016 2017
	if (local->quiescing) {
		set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
		return;
	}

J
Johannes Berg 已提交
2018
	ieee80211_queue_work(&local->hw, &sdata->work);
2019 2020
}

2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
					  u8 *bssid)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

	ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
			  IEEE80211_STA_BEACON_POLL);

	ieee80211_set_disassoc(sdata, true, true);
	mutex_unlock(&ifmgd->mtx);
	mutex_lock(&local->mtx);
	ieee80211_recalc_idle(local);
	mutex_unlock(&local->mtx);
	/*
	 * must be outside lock due to cfg80211,
	 * but that's not a problem.
	 */
	ieee80211_send_deauth_disassoc(sdata, bssid,
			IEEE80211_STYPE_DEAUTH,
			WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
			NULL, true);
	mutex_lock(&ifmgd->mtx);
}

2046
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
2047 2048
{
	struct ieee80211_local *local = sdata->local;
2049
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
2050

2051 2052 2053
	/* then process the rest of the work */
	mutex_lock(&ifmgd->mtx);

J
Johannes Berg 已提交
2054 2055 2056
	if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
			    IEEE80211_STA_CONNECTION_POLL) &&
	    ifmgd->associated) {
2057
		u8 bssid[ETH_ALEN];
2058
		int max_tries;
2059

2060
		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2061

2062
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2063
			max_tries = max_nullfunc_tries;
2064
		else
2065
			max_tries = max_probe_tries;
2066

2067 2068 2069
		/* ACK received for nullfunc probing frame */
		if (!ifmgd->probe_send_count)
			ieee80211_reset_ap_probe(sdata);
2070 2071 2072 2073 2074
		else if (ifmgd->nullfunc_failed) {
			if (ifmgd->probe_send_count < max_tries) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
				wiphy_debug(local->hw.wiphy,
					    "%s: No ack for nullfunc frame to"
2075
					    " AP %pM, try %d/%i\n",
2076
					    sdata->name, bssid,
2077
					    ifmgd->probe_send_count, max_tries);
2078 2079 2080 2081 2082 2083 2084
#endif
				ieee80211_mgd_probe_ap_send(sdata);
			} else {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
				wiphy_debug(local->hw.wiphy,
					    "%s: No ack for nullfunc frame to"
					    " AP %pM, disconnecting.\n",
F
Felix Fietkau 已提交
2085
					    sdata->name, bssid);
2086 2087 2088 2089
#endif
				ieee80211_sta_connection_lost(sdata, bssid);
			}
		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
J
Johannes Berg 已提交
2090
			run_again(ifmgd, ifmgd->probe_timeout);
2091 2092 2093 2094 2095 2096
		else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
			wiphy_debug(local->hw.wiphy,
				    "%s: Failed to send nullfunc to AP %pM"
				    " after %dms, disconnecting.\n",
				    sdata->name,
2097
				    bssid, probe_wait_ms);
2098 2099 2100
#endif
			ieee80211_sta_connection_lost(sdata, bssid);
		} else if (ifmgd->probe_send_count < max_tries) {
2101
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2102 2103
			wiphy_debug(local->hw.wiphy,
				    "%s: No probe response from AP %pM"
2104
				    " after %dms, try %d/%i\n",
2105
				    sdata->name,
2106
				    bssid, probe_wait_ms,
2107
				    ifmgd->probe_send_count, max_tries);
2108 2109 2110
#endif
			ieee80211_mgd_probe_ap_send(sdata);
		} else {
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2111 2112 2113 2114
			/*
			 * We actually lost the connection ... or did we?
			 * Let's make sure!
			 */
2115 2116 2117 2118
			wiphy_debug(local->hw.wiphy,
				    "%s: No probe response from AP %pM"
				    " after %dms, disconnecting.\n",
				    sdata->name,
2119
				    bssid, probe_wait_ms);
2120 2121

			ieee80211_sta_connection_lost(sdata, bssid);
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2122 2123 2124
		}
	}

2125
	mutex_unlock(&ifmgd->mtx);
2126 2127
}

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2128 2129 2130 2131 2132 2133 2134 2135 2136
static void ieee80211_sta_bcn_mon_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
	struct ieee80211_local *local = sdata->local;

	if (local->quiescing)
		return;

2137 2138
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.beacon_connection_loss_work);
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2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150
}

static void ieee80211_sta_conn_mon_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_local *local = sdata->local;

	if (local->quiescing)
		return;

2151
	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
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2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162
}

static void ieee80211_sta_monitor_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
			     u.mgd.monitor_work);

	ieee80211_mgd_probe_ap(sdata, false);
}

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2163 2164
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
2165
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
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2166 2167
		sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
					IEEE80211_STA_CONNECTION_POLL);
2168

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2169
		/* let's probe the connection once */
2170
		ieee80211_queue_work(&sdata->local->hw,
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2171 2172
			   &sdata->u.mgd.monitor_work);
		/* and do all the other regular work too */
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2173
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2174
	}
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2175
}
2176

2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187
#ifdef CONFIG_PM
void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

	/*
	 * we need to use atomic bitops for the running bits
	 * only because both timers might fire at the same
	 * time -- the code here is properly synchronised.
	 */

2188 2189
	cancel_work_sync(&ifmgd->request_smps_work);

2190
	cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2191 2192 2193 2194 2195 2196
	if (del_timer_sync(&ifmgd->timer))
		set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);

	cancel_work_sync(&ifmgd->chswitch_work);
	if (del_timer_sync(&ifmgd->chswitch_timer))
		set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
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2197 2198 2199 2200 2201

	cancel_work_sync(&ifmgd->monitor_work);
	/* these will just be re-established on connection */
	del_timer_sync(&ifmgd->conn_mon_timer);
	del_timer_sync(&ifmgd->bcn_mon_timer);
2202 2203 2204 2205 2206 2207 2208 2209 2210 2211
}

void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

	if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
		add_timer(&ifmgd->timer);
	if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
		add_timer(&ifmgd->chswitch_timer);
2212
	ieee80211_sta_reset_beacon_monitor(sdata);
2213
	ieee80211_restart_sta_timer(sdata);
2214 2215 2216
}
#endif

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2217 2218
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2219
{
2220
	struct ieee80211_if_managed *ifmgd;
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2221

2222
	ifmgd = &sdata->u.mgd;
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2223
	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2224
	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2225 2226
	INIT_WORK(&ifmgd->beacon_connection_loss_work,
		  ieee80211_beacon_connection_loss_work);
2227
	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2228
	setup_timer(&ifmgd->timer, ieee80211_sta_timer,
S
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2229
		    (unsigned long) sdata);
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2230 2231 2232 2233
	setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
		    (unsigned long) sdata);
	setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
		    (unsigned long) sdata);
2234
	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
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2235 2236
		    (unsigned long) sdata);

2237
	ifmgd->flags = 0;
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2238

2239
	mutex_init(&ifmgd->mtx);
2240 2241 2242 2243 2244

	if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
	else
		ifmgd->req_smps = IEEE80211_SMPS_OFF;
2245 2246
}

2247 2248
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
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2249
{
2250
	struct ieee80211_sub_if_data *sdata = local->scan_sdata;
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2251

2252 2253 2254 2255 2256 2257
	/* Restart STA timers */
	rcu_read_lock();
	list_for_each_entry_rcu(sdata, &local->interfaces, list)
		ieee80211_restart_sta_timer(sdata);
	rcu_read_unlock();
}
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2258

2259 2260 2261 2262 2263 2264 2265
int ieee80211_max_network_latency(struct notifier_block *nb,
				  unsigned long data, void *dummy)
{
	s32 latency_usec = (s32) data;
	struct ieee80211_local *local =
		container_of(nb, struct ieee80211_local,
			     network_latency_notifier);
2266

2267 2268 2269
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, latency_usec);
	mutex_unlock(&local->iflist_mtx);
2270

2271
	return 0;
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2272 2273
}

2274
/* config hooks */
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2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297
static enum work_done_result
ieee80211_probe_auth_done(struct ieee80211_work *wk,
			  struct sk_buff *skb)
{
	if (!skb) {
		cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
		return WORK_DONE_DESTROY;
	}

	if (wk->type == IEEE80211_WORK_AUTH) {
		cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
		return WORK_DONE_DESTROY;
	}

	mutex_lock(&wk->sdata->u.mgd.mtx);
	ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
	mutex_unlock(&wk->sdata->u.mgd.mtx);

	wk->type = IEEE80211_WORK_AUTH;
	wk->probe_auth.tries = 0;
	return WORK_DONE_REQUEUE;
}

2298 2299
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
		       struct cfg80211_auth_request *req)
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2300
{
2301
	const u8 *ssid;
2302
	struct ieee80211_work *wk;
2303
	u16 auth_alg;
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2304

2305 2306 2307
	if (req->local_state_change)
		return 0; /* no need to update mac80211 state */

2308 2309 2310 2311 2312
	switch (req->auth_type) {
	case NL80211_AUTHTYPE_OPEN_SYSTEM:
		auth_alg = WLAN_AUTH_OPEN;
		break;
	case NL80211_AUTHTYPE_SHARED_KEY:
2313 2314
		if (IS_ERR(sdata->local->wep_tx_tfm))
			return -EOPNOTSUPP;
2315 2316 2317 2318 2319 2320 2321 2322 2323 2324
		auth_alg = WLAN_AUTH_SHARED_KEY;
		break;
	case NL80211_AUTHTYPE_FT:
		auth_alg = WLAN_AUTH_FT;
		break;
	case NL80211_AUTHTYPE_NETWORK_EAP:
		auth_alg = WLAN_AUTH_LEAP;
		break;
	default:
		return -EOPNOTSUPP;
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2325
	}
2326 2327 2328

	wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
	if (!wk)
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2329
		return -ENOMEM;
2330

2331
	memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2332 2333 2334 2335

	if (req->ie && req->ie_len) {
		memcpy(wk->ie, req->ie, req->ie_len);
		wk->ie_len = req->ie_len;
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2336
	}
2337

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2338
	if (req->key && req->key_len) {
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2339 2340 2341
		wk->probe_auth.key_len = req->key_len;
		wk->probe_auth.key_idx = req->key_idx;
		memcpy(wk->probe_auth.key, req->key, req->key_len);
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2342 2343
	}

2344
	ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
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2345 2346
	memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
	wk->probe_auth.ssid_len = ssid[1];
2347

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2348 2349
	wk->probe_auth.algorithm = auth_alg;
	wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2350

2351 2352 2353 2354 2355
	/* if we already have a probe, don't probe again */
	if (req->bss->proberesp_ies)
		wk->type = IEEE80211_WORK_AUTH;
	else
		wk->type = IEEE80211_WORK_DIRECT_PROBE;
2356
	wk->chan = req->bss->channel;
2357
	wk->chan_type = NL80211_CHAN_NO_HT;
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2358 2359
	wk->sdata = sdata;
	wk->done = ieee80211_probe_auth_done;
2360

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2361
	ieee80211_add_work(wk);
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2362
	return 0;
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2363 2364
}

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2365 2366 2367 2368
static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
						  struct sk_buff *skb)
{
	struct ieee80211_mgmt *mgmt;
2369 2370
	struct ieee80211_rx_status *rx_status;
	struct ieee802_11_elems elems;
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2371 2372 2373 2374 2375 2376 2377
	u16 status;

	if (!skb) {
		cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
		return WORK_DONE_DESTROY;
	}

2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390
	if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
		mutex_lock(&wk->sdata->u.mgd.mtx);
		rx_status = (void *) skb->cb;
		ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
		ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
				      &elems, true);
		mutex_unlock(&wk->sdata->u.mgd.mtx);

		wk->type = IEEE80211_WORK_ASSOC;
		/* not really done yet */
		return WORK_DONE_REQUEUE;
	}

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2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402
	mgmt = (void *)skb->data;
	status = le16_to_cpu(mgmt->u.assoc_resp.status_code);

	if (status == WLAN_STATUS_SUCCESS) {
		mutex_lock(&wk->sdata->u.mgd.mtx);
		if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
			mutex_unlock(&wk->sdata->u.mgd.mtx);
			/* oops -- internal error -- send timeout for now */
			cfg80211_send_assoc_timeout(wk->sdata->dev,
						    wk->filter_ta);
			return WORK_DONE_DESTROY;
		}
2403 2404

		mutex_unlock(&wk->sdata->u.mgd.mtx);
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2405 2406 2407 2408 2409 2410
	}

	cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
	return WORK_DONE_DESTROY;
}

2411 2412
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_assoc_request *req)
2413
{
2414
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2415
	struct ieee80211_bss *bss = (void *)req->bss->priv;
2416
	struct ieee80211_work *wk;
2417
	const u8 *ssid;
J
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2418
	int i;
2419

2420
	mutex_lock(&ifmgd->mtx);
J
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2421
	if (ifmgd->associated) {
2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434
		if (!req->prev_bssid ||
		    memcmp(req->prev_bssid, ifmgd->associated->bssid,
			   ETH_ALEN)) {
			/*
			 * We are already associated and the request was not a
			 * reassociation request from the current BSS, so
			 * reject it.
			 */
			mutex_unlock(&ifmgd->mtx);
			return -EALREADY;
		}

		/* Trying to reassociate - clear previous association state */
2435
		ieee80211_set_disassoc(sdata, true, false);
J
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2436 2437
	}
	mutex_unlock(&ifmgd->mtx);
2438

2439
	wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
J
Johannes Berg 已提交
2440 2441
	if (!wk)
		return -ENOMEM;
2442 2443

	ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2444
	ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2445

2446 2447
	ifmgd->beacon_crc_valid = false;

2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460
	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
			ifmgd->flags |= IEEE80211_STA_DISABLE_11N;


	if (req->ie && req->ie_len) {
		memcpy(wk->ie, req->ie, req->ie_len);
		wk->ie_len = req->ie_len;
	} else
		wk->ie_len = 0;

2461
	wk->assoc.bss = req->bss;
2462

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2463
	memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2464

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2465 2466 2467 2468 2469 2470 2471 2472 2473 2474
	/* new association always uses requested smps mode */
	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
		if (ifmgd->powersave)
			ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
		else
			ifmgd->ap_smps = IEEE80211_SMPS_OFF;
	} else
		ifmgd->ap_smps = ifmgd->req_smps;

	wk->assoc.smps = ifmgd->ap_smps;
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2475 2476 2477 2478 2479 2480 2481
	/*
	 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
	 * We still associate in non-HT mode (11a/b/g) if any one of these
	 * ciphers is configured as pairwise.
	 * We can set this to true for non-11n hardware, that'll be checked
	 * separately along with the peer capabilities.
	 */
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2482
	wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2483
	wk->assoc.capability = req->bss->capability;
2484 2485 2486
	wk->assoc.wmm_used = bss->wmm_used;
	wk->assoc.supp_rates = bss->supp_rates;
	wk->assoc.supp_rates_len = bss->supp_rates_len;
2487 2488
	wk->assoc.ht_information_ie =
		ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2489

K
Kalle Valo 已提交
2490 2491 2492 2493 2494 2495 2496 2497 2498
	if (bss->wmm_used && bss->uapsd_supported &&
	    (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
		wk->assoc.uapsd_used = true;
		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
	} else {
		wk->assoc.uapsd_used = false;
		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
	}

2499
	ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2500 2501
	memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
	wk->assoc.ssid_len = ssid[1];
2502

2503
	if (req->prev_bssid)
2504
		memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2505

2506
	wk->chan = req->bss->channel;
2507
	wk->chan_type = NL80211_CHAN_NO_HT;
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2508 2509
	wk->sdata = sdata;
	wk->done = ieee80211_assoc_done;
2510 2511 2512 2513 2514
	if (!bss->dtim_period &&
	    sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
		wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
	else
		wk->type = IEEE80211_WORK_ASSOC;
2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528

	if (req->use_mfp) {
		ifmgd->mfp = IEEE80211_MFP_REQUIRED;
		ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
	} else {
		ifmgd->mfp = IEEE80211_MFP_DISABLED;
		ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
	}

	if (req->crypto.control_port)
		ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
	else
		ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;

2529 2530 2531
	sdata->control_port_protocol = req->crypto.control_port_ethertype;
	sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;

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2532 2533
	ieee80211_add_work(wk);
	return 0;
2534 2535
}

2536
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
J
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2537 2538
			 struct cfg80211_deauth_request *req,
			 void *cookie)
2539
{
J
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2540
	struct ieee80211_local *local = sdata->local;
2541
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2542
	struct ieee80211_work *wk;
2543 2544
	u8 bssid[ETH_ALEN];
	bool assoc_bss = false;
2545

2546 2547
	mutex_lock(&ifmgd->mtx);

2548
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
2549
	if (ifmgd->associated == req->bss) {
2550
		ieee80211_set_disassoc(sdata, false, true);
J
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2551
		mutex_unlock(&ifmgd->mtx);
2552
		assoc_bss = true;
J
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2553 2554
	} else {
		bool not_auth_yet = false;
2555

2556 2557
		mutex_unlock(&ifmgd->mtx);

2558
		mutex_lock(&local->mtx);
J
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2559
		list_for_each_entry(wk, &local->work_list, list) {
J
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2560
			if (wk->sdata != sdata)
J
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2561
				continue;
J
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2562 2563

			if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2564
			    wk->type != IEEE80211_WORK_AUTH &&
2565 2566
			    wk->type != IEEE80211_WORK_ASSOC &&
			    wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
J
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2567 2568
				continue;

J
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2569 2570
			if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
				continue;
J
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2571 2572 2573

			not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
			list_del_rcu(&wk->list);
J
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2574 2575 2576
			free_work(wk);
			break;
		}
2577
		mutex_unlock(&local->mtx);
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2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591

		/*
		 * If somebody requests authentication and we haven't
		 * sent out an auth frame yet there's no need to send
		 * out a deauth frame either. If the state was PROBE,
		 * then this is the case. If it's AUTH we have sent a
		 * frame, and if it's IDLE we have completed the auth
		 * process already.
		 */
		if (not_auth_yet) {
			__cfg80211_auth_canceled(sdata->dev, bssid);
			return 0;
		}
	}
2592

2593
	printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2594
	       sdata->name, bssid, req->reason_code);
2595

2596 2597 2598
	ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
				       req->reason_code, cookie,
				       !req->local_state_change);
2599 2600
	if (assoc_bss)
		sta_info_destroy_addr(sdata, bssid);
2601

2602
	mutex_lock(&sdata->local->mtx);
2603
	ieee80211_recalc_idle(sdata->local);
2604
	mutex_unlock(&sdata->local->mtx);
2605

2606 2607
	return 0;
}
2608

2609
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
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2610 2611
			   struct cfg80211_disassoc_request *req,
			   void *cookie)
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2612
{
2613
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2614
	u8 bssid[ETH_ALEN];
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Johannes Berg 已提交
2615

2616
	mutex_lock(&ifmgd->mtx);
2617

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2618 2619 2620 2621 2622 2623
	/*
	 * cfg80211 should catch this ... but it's racy since
	 * we can receive a disassoc frame, process it, hand it
	 * to cfg80211 while that's in a locked section already
	 * trying to tell us that the user wants to disconnect.
	 */
2624
	if (ifmgd->associated != req->bss) {
2625 2626 2627 2628
		mutex_unlock(&ifmgd->mtx);
		return -ENOLINK;
	}

2629
	printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2630
	       sdata->name, req->bss->bssid, req->reason_code);
2631

2632
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
2633
	ieee80211_set_disassoc(sdata, false, true);
2634 2635

	mutex_unlock(&ifmgd->mtx);
2636

2637
	ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
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Johannes Berg 已提交
2638
			IEEE80211_STYPE_DISASSOC, req->reason_code,
2639
			cookie, !req->local_state_change);
2640
	sta_info_destroy_addr(sdata, bssid);
2641

2642
	mutex_lock(&sdata->local->mtx);
2643
	ieee80211_recalc_idle(sdata->local);
2644
	mutex_unlock(&sdata->local->mtx);
2645

2646 2647
	return 0;
}
2648

2649 2650 2651 2652 2653 2654
void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
			       enum nl80211_cqm_rssi_threshold_event rssi_event,
			       gfp_t gfp)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

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2655 2656
	trace_api_cqm_rssi_notify(sdata, rssi_event);

2657 2658 2659
	cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);