work.c 27.7 KB
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/*
 * mac80211 work implementation
 *
 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
 * 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>
 * Copyright 2009, Johannes Berg <johannes@sipsolutions.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.
 */

#include <linux/delay.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/crc32.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>

#include "ieee80211_i.h"
#include "rate.h"

#define IEEE80211_AUTH_TIMEOUT (HZ / 5)
#define IEEE80211_AUTH_MAX_TRIES 3
#define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
#define IEEE80211_ASSOC_MAX_TRIES 3
#define IEEE80211_MAX_PROBE_TRIES 5

enum work_action {
	WORK_ACT_NONE,
	WORK_ACT_TIMEOUT,
	WORK_ACT_DONE,
};


/* utils */
static inline void ASSERT_WORK_MTX(struct ieee80211_local *local)
{
	WARN_ON(!mutex_is_locked(&local->work_mtx));
}

/*
 * 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_local *local,
		      unsigned long timeout)
{
	ASSERT_WORK_MTX(local);

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

static void work_free_rcu(struct rcu_head *head)
{
	struct ieee80211_work *wk =
		container_of(head, struct ieee80211_work, rcu_head);

	kfree(wk);
}

void free_work(struct ieee80211_work *wk)
{
	call_rcu(&wk->rcu_head, work_free_rcu);
}

static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
				      struct ieee80211_supported_band *sband,
				      u32 *rates)
{
	int i, j, count;
	*rates = 0;
	count = 0;
	for (i = 0; i < supp_rates_len; i++) {
		int rate = (supp_rates[i] & 0x7F) * 5;

		for (j = 0; j < sband->n_bitrates; j++)
			if (sband->bitrates[j].bitrate == rate) {
				*rates |= BIT(j);
				count++;
				break;
			}
	}

	return count;
}

/* frame sending functions */

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static void ieee80211_add_ht_ie(struct sk_buff *skb, const u8 *ht_info_ie,
				struct ieee80211_supported_band *sband,
				struct ieee80211_channel *channel,
				enum ieee80211_smps_mode smps)
{
	struct ieee80211_ht_info *ht_info;
	u8 *pos;
	u32 flags = channel->flags;
	u16 cap = sband->ht_cap.cap;
	__le16 tmp;

	if (!sband->ht_cap.ht_supported)
		return;

	if (!ht_info_ie)
		return;

	if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info))
		return;

	ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);

	/* determine capability flags */

	if (ieee80211_disable_40mhz_24ghz &&
	    sband->band == IEEE80211_BAND_2GHZ) {
		cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
		cap &= ~IEEE80211_HT_CAP_SGI_40;
	}

	switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
		if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
			cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
			cap &= ~IEEE80211_HT_CAP_SGI_40;
		}
		break;
	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
		if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
			cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
			cap &= ~IEEE80211_HT_CAP_SGI_40;
		}
		break;
	}

	/* set SM PS mode properly */
	cap &= ~IEEE80211_HT_CAP_SM_PS;
	switch (smps) {
	case IEEE80211_SMPS_AUTOMATIC:
	case IEEE80211_SMPS_NUM_MODES:
		WARN_ON(1);
	case IEEE80211_SMPS_OFF:
		cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
			IEEE80211_HT_CAP_SM_PS_SHIFT;
		break;
	case IEEE80211_SMPS_STATIC:
		cap |= WLAN_HT_CAP_SM_PS_STATIC <<
			IEEE80211_HT_CAP_SM_PS_SHIFT;
		break;
	case IEEE80211_SMPS_DYNAMIC:
		cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
			IEEE80211_HT_CAP_SM_PS_SHIFT;
		break;
	}

	/* reserve and fill IE */

	pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
	*pos++ = WLAN_EID_HT_CAPABILITY;
	*pos++ = sizeof(struct ieee80211_ht_cap);
	memset(pos, 0, sizeof(struct ieee80211_ht_cap));

	/* capability flags */
	tmp = cpu_to_le16(cap);
	memcpy(pos, &tmp, sizeof(u16));
	pos += sizeof(u16);

	/* AMPDU parameters */
	*pos++ = sband->ht_cap.ampdu_factor |
		 (sband->ht_cap.ampdu_density <<
			IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);

	/* MCS set */
	memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
	pos += sizeof(sband->ht_cap.mcs);

	/* extended capabilities */
	pos += sizeof(__le16);

	/* BF capabilities */
	pos += sizeof(__le32);

	/* antenna selection */
	pos += sizeof(u8);
}

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static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
				 struct ieee80211_work *wk)
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u8 *pos;
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	const u8 *ies;
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	size_t offset = 0, noffset;
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	int i, len, count, rates_len, supp_rates_len;
	u16 capab;
	struct ieee80211_supported_band *sband;
	u32 rates = 0;

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	sband = local->hw.wiphy->bands[wk->chan->band];

	/*
	 * Get all rates supported by the device and the AP as
	 * some APs don't like getting a superset of their rates
	 * in the association request (e.g. D-Link DAP 1353 in
	 * b-only mode)...
	 */
	rates_len = ieee80211_compatible_rates(wk->assoc.supp_rates,
					       wk->assoc.supp_rates_len,
					       sband, &rates);

	skb = alloc_skb(local->hw.extra_tx_headroom +
			sizeof(*mgmt) + /* bit too much but doesn't matter */
			2 + wk->assoc.ssid_len + /* SSID */
			4 + rates_len + /* (extended) rates */
			4 + /* power capability */
			2 + 2 * sband->n_channels + /* supported channels */
			2 + sizeof(struct ieee80211_ht_cap) + /* HT */
			wk->ie_len + /* extra IEs */
			9, /* WMM */
			GFP_KERNEL);
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	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
		       "frame\n", sdata->name);
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	capab = WLAN_CAPABILITY_ESS;

	if (sband->band == IEEE80211_BAND_2GHZ) {
		if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
			capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
		if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
			capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
	}

	if (wk->assoc.capability & WLAN_CAPABILITY_PRIVACY)
		capab |= WLAN_CAPABILITY_PRIVACY;

	if ((wk->assoc.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
	    (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
		capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, wk->filter_ta, ETH_ALEN);
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
	memcpy(mgmt->bssid, wk->filter_ta, ETH_ALEN);

	if (!is_zero_ether_addr(wk->assoc.prev_bssid)) {
		skb_put(skb, 10);
		mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						  IEEE80211_STYPE_REASSOC_REQ);
		mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
		mgmt->u.reassoc_req.listen_interval =
				cpu_to_le16(local->hw.conf.listen_interval);
		memcpy(mgmt->u.reassoc_req.current_ap, wk->assoc.prev_bssid,
		       ETH_ALEN);
	} else {
		skb_put(skb, 4);
		mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						  IEEE80211_STYPE_ASSOC_REQ);
		mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
		mgmt->u.assoc_req.listen_interval =
				cpu_to_le16(local->hw.conf.listen_interval);
	}

	/* SSID */
	ies = pos = skb_put(skb, 2 + wk->assoc.ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = wk->assoc.ssid_len;
	memcpy(pos, wk->assoc.ssid, wk->assoc.ssid_len);

	/* add all rates which were marked to be used above */
	supp_rates_len = rates_len;
	if (supp_rates_len > 8)
		supp_rates_len = 8;

	len = sband->n_bitrates;
	pos = skb_put(skb, supp_rates_len + 2);
	*pos++ = WLAN_EID_SUPP_RATES;
	*pos++ = supp_rates_len;

	count = 0;
	for (i = 0; i < sband->n_bitrates; i++) {
		if (BIT(i) & rates) {
			int rate = sband->bitrates[i].bitrate;
			*pos++ = (u8) (rate / 5);
			if (++count == 8)
				break;
		}
	}

	if (rates_len > count) {
		pos = skb_put(skb, rates_len - count + 2);
		*pos++ = WLAN_EID_EXT_SUPP_RATES;
		*pos++ = rates_len - count;

		for (i++; i < sband->n_bitrates; i++) {
			if (BIT(i) & rates) {
				int rate = sband->bitrates[i].bitrate;
				*pos++ = (u8) (rate / 5);
			}
		}
	}

	if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
		/* 1. power capabilities */
		pos = skb_put(skb, 4);
		*pos++ = WLAN_EID_PWR_CAPABILITY;
		*pos++ = 2;
		*pos++ = 0; /* min tx power */
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		*pos++ = wk->chan->max_power; /* max tx power */
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		/* 2. supported channels */
		/* TODO: get this in reg domain format */
		pos = skb_put(skb, 2 * sband->n_channels + 2);
		*pos++ = WLAN_EID_SUPPORTED_CHANNELS;
		*pos++ = 2 * sband->n_channels;
		for (i = 0; i < sband->n_channels; i++) {
			*pos++ = ieee80211_frequency_to_channel(
					sband->channels[i].center_freq);
			*pos++ = 1; /* one channel in the subband*/
		}
	}

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	/* if present, add any custom IEs that go before HT */
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	if (wk->ie_len && wk->ie) {
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		static const u8 before_ht[] = {
			WLAN_EID_SSID,
			WLAN_EID_SUPP_RATES,
			WLAN_EID_EXT_SUPP_RATES,
			WLAN_EID_PWR_CAPABILITY,
			WLAN_EID_SUPPORTED_CHANNELS,
			WLAN_EID_RSN,
			WLAN_EID_QOS_CAPA,
			WLAN_EID_RRM_ENABLED_CAPABILITIES,
			WLAN_EID_MOBILITY_DOMAIN,
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
		noffset = ieee80211_ie_split(wk->ie, wk->ie_len,
					     before_ht, ARRAY_SIZE(before_ht),
					     offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, wk->ie + offset, noffset - offset);
		offset = noffset;
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	}

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	if (wk->assoc.use_11n && wk->assoc.wmm_used &&
	    local->hw.queues >= 4)
		ieee80211_add_ht_ie(skb, wk->assoc.ht_information_ie,
				    sband, wk->chan, wk->assoc.smps);

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	/* if present, add any custom non-vendor IEs that go after HT */
	if (wk->ie_len && wk->ie) {
		noffset = ieee80211_ie_split_vendor(wk->ie, wk->ie_len,
						    offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, wk->ie + offset, noffset - offset);
		offset = noffset;
	}

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	if (wk->assoc.wmm_used && local->hw.queues >= 4) {
		pos = skb_put(skb, 9);
		*pos++ = WLAN_EID_VENDOR_SPECIFIC;
		*pos++ = 7; /* len */
		*pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
		*pos++ = 0x50;
		*pos++ = 0xf2;
		*pos++ = 2; /* WME */
		*pos++ = 0; /* WME info */
		*pos++ = 1; /* WME ver */
		*pos++ = 0;
	}

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	/* add any remaining custom (i.e. vendor specific here) IEs */
	if (wk->ie_len && wk->ie) {
		noffset = wk->ie_len;
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, wk->ie + offset, noffset - offset);
	}

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

static void ieee80211_remove_auth_bss(struct ieee80211_local *local,
				      struct ieee80211_work *wk)
{
	struct cfg80211_bss *cbss;
	u16 capa_val = WLAN_CAPABILITY_ESS;

	if (wk->probe_auth.privacy)
		capa_val |= WLAN_CAPABILITY_PRIVACY;

	cbss = cfg80211_get_bss(local->hw.wiphy, wk->chan, wk->filter_ta,
				wk->probe_auth.ssid, wk->probe_auth.ssid_len,
				WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
				capa_val);
	if (!cbss)
		return;

	cfg80211_unlink_bss(local->hw.wiphy, cbss);
	cfg80211_put_bss(cbss);
}

static enum work_action __must_check
ieee80211_direct_probe(struct ieee80211_work *wk)
{
	struct ieee80211_sub_if_data *sdata = wk->sdata;
	struct ieee80211_local *local = sdata->local;

	wk->probe_auth.tries++;
	if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
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		printk(KERN_DEBUG "%s: direct probe to %pM timed out\n",
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		       sdata->name, wk->filter_ta);

		/*
		 * Most likely AP is not in the range so remove the
		 * bss struct for that AP.
		 */
		ieee80211_remove_auth_bss(local, wk);

		return WORK_ACT_TIMEOUT;
	}

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	printk(KERN_DEBUG "%s: direct probe to %pM (try %d)\n",
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			sdata->name, wk->filter_ta, wk->probe_auth.tries);

	/*
	 * Direct probe is sent to broadcast address as some APs
	 * will not answer to direct packet in unassociated state.
	 */
	ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
				 wk->probe_auth.ssid_len, NULL, 0);

	wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
	run_again(local, wk->timeout);

	return WORK_ACT_NONE;
}


static enum work_action __must_check
ieee80211_authenticate(struct ieee80211_work *wk)
{
	struct ieee80211_sub_if_data *sdata = wk->sdata;
	struct ieee80211_local *local = sdata->local;

	wk->probe_auth.tries++;
	if (wk->probe_auth.tries > IEEE80211_AUTH_MAX_TRIES) {
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		printk(KERN_DEBUG "%s: authentication with %pM"
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		       " timed out\n", sdata->name, wk->filter_ta);

		/*
		 * Most likely AP is not in the range so remove the
		 * bss struct for that AP.
		 */
		ieee80211_remove_auth_bss(local, wk);

		return WORK_ACT_TIMEOUT;
	}

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	printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
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	       sdata->name, wk->filter_ta, wk->probe_auth.tries);

	ieee80211_send_auth(sdata, 1, wk->probe_auth.algorithm, wk->ie,
			    wk->ie_len, wk->filter_ta, NULL, 0, 0);
	wk->probe_auth.transaction = 2;

	wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
	run_again(local, wk->timeout);

	return WORK_ACT_NONE;
}

static enum work_action __must_check
ieee80211_associate(struct ieee80211_work *wk)
{
	struct ieee80211_sub_if_data *sdata = wk->sdata;
	struct ieee80211_local *local = sdata->local;

	wk->assoc.tries++;
	if (wk->assoc.tries > IEEE80211_ASSOC_MAX_TRIES) {
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		printk(KERN_DEBUG "%s: association with %pM"
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		       " timed out\n",
		       sdata->name, wk->filter_ta);

		/*
		 * Most likely AP is not in the range so remove the
		 * bss struct for that AP.
		 */
		if (wk->assoc.bss)
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			cfg80211_unlink_bss(local->hw.wiphy, wk->assoc.bss);
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		return WORK_ACT_TIMEOUT;
	}

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	printk(KERN_DEBUG "%s: associate with %pM (try %d)\n",
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	       sdata->name, wk->filter_ta, wk->assoc.tries);
	ieee80211_send_assoc(sdata, wk);

	wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
	run_again(local, wk->timeout);

	return WORK_ACT_NONE;
}

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static enum work_action __must_check
ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
{
	/*
	 * First time we run, do nothing -- the generic code will
	 * have switched to the right channel etc.
	 */
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	if (!wk->remain.started) {
		wk->remain.started = true;
		wk->timeout = jiffies + msecs_to_jiffies(wk->remain.duration);
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		cfg80211_ready_on_channel(wk->sdata->dev, (unsigned long) wk,
					  wk->chan, wk->chan_type,
					  wk->remain.duration, GFP_KERNEL);
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		return WORK_ACT_NONE;
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	}

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	return WORK_ACT_TIMEOUT;
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}

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static void ieee80211_auth_challenge(struct ieee80211_work *wk,
				     struct ieee80211_mgmt *mgmt,
				     size_t len)
{
	struct ieee80211_sub_if_data *sdata = wk->sdata;
	u8 *pos;
	struct ieee802_11_elems elems;

	pos = mgmt->u.auth.variable;
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
	if (!elems.challenge)
		return;
	ieee80211_send_auth(sdata, 3, wk->probe_auth.algorithm,
			    elems.challenge - 2, elems.challenge_len + 2,
			    wk->filter_ta, wk->probe_auth.key,
			    wk->probe_auth.key_len, wk->probe_auth.key_idx);
	wk->probe_auth.transaction = 4;
}

static enum work_action __must_check
ieee80211_rx_mgmt_auth(struct ieee80211_work *wk,
		       struct ieee80211_mgmt *mgmt, size_t len)
{
	u16 auth_alg, auth_transaction, status_code;

	if (wk->type != IEEE80211_WORK_AUTH)
		return WORK_ACT_NONE;

	if (len < 24 + 6)
		return WORK_ACT_NONE;

	auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
	auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
	status_code = le16_to_cpu(mgmt->u.auth.status_code);

	if (auth_alg != wk->probe_auth.algorithm ||
	    auth_transaction != wk->probe_auth.transaction)
		return WORK_ACT_NONE;

	if (status_code != WLAN_STATUS_SUCCESS) {
		printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
		       wk->sdata->name, mgmt->sa, status_code);
		return WORK_ACT_DONE;
	}

	switch (wk->probe_auth.algorithm) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
	case WLAN_AUTH_FT:
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (wk->probe_auth.transaction != 4) {
			ieee80211_auth_challenge(wk, mgmt, len);
			/* need another frame */
			return WORK_ACT_NONE;
		}
		break;
	default:
		WARN_ON(1);
		return WORK_ACT_NONE;
	}

	printk(KERN_DEBUG "%s: authenticated\n", wk->sdata->name);
	return WORK_ACT_DONE;
}

static enum work_action __must_check
ieee80211_rx_mgmt_assoc_resp(struct ieee80211_work *wk,
			     struct ieee80211_mgmt *mgmt, size_t len,
			     bool reassoc)
{
	struct ieee80211_sub_if_data *sdata = wk->sdata;
	struct ieee80211_local *local = sdata->local;
	u16 capab_info, status_code, aid;
	struct ieee802_11_elems elems;
	u8 *pos;

	/*
	 * AssocResp and ReassocResp have identical structure, so process both
	 * of them in this function.
	 */

	if (len < 24 + 6)
		return WORK_ACT_NONE;

	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
	status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);

	printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
	       "status=%d aid=%d)\n",
	       sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
	       capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));

	pos = mgmt->u.assoc_resp.variable;
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);

	if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
	    elems.timeout_int && elems.timeout_int_len == 5 &&
	    elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
		u32 tu, ms;
		tu = get_unaligned_le32(elems.timeout_int + 1);
		ms = tu * 1024 / 1000;
647
		printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
648
		       "comeback duration %u TU (%u ms)\n",
649
		       sdata->name, mgmt->sa, tu, ms);
650 651 652 653 654 655 656
		wk->timeout = jiffies + msecs_to_jiffies(ms);
		if (ms > IEEE80211_ASSOC_TIMEOUT)
			run_again(local, wk->timeout);
		return WORK_ACT_NONE;
	}

	if (status_code != WLAN_STATUS_SUCCESS)
657 658
		printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
		       sdata->name, mgmt->sa, status_code);
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	else
		printk(KERN_DEBUG "%s: associated\n", sdata->name);

	return WORK_ACT_DONE;
}

static enum work_action __must_check
ieee80211_rx_mgmt_probe_resp(struct ieee80211_work *wk,
			     struct ieee80211_mgmt *mgmt, size_t len,
			     struct ieee80211_rx_status *rx_status)
{
	struct ieee80211_sub_if_data *sdata = wk->sdata;
	struct ieee80211_local *local = sdata->local;
	size_t baselen;

	ASSERT_WORK_MTX(local);

	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return WORK_ACT_NONE;

	printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
	return WORK_ACT_DONE;
}

static void ieee80211_work_rx_queued_mgmt(struct ieee80211_local *local,
					  struct sk_buff *skb)
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	struct ieee80211_work *wk;
	enum work_action rma = WORK_ACT_NONE;
	u16 fc;

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

	mutex_lock(&local->work_mtx);

	list_for_each_entry(wk, &local->work_list, list) {
		const u8 *bssid = NULL;

		switch (wk->type) {
		case IEEE80211_WORK_DIRECT_PROBE:
		case IEEE80211_WORK_AUTH:
		case IEEE80211_WORK_ASSOC:
			bssid = wk->filter_ta;
			break;
		default:
			continue;
		}

		/*
		 * Before queuing, we already verified mgmt->sa,
		 * so this is needed just for matching.
		 */
		if (compare_ether_addr(bssid, mgmt->bssid))
			continue;

		switch (fc & IEEE80211_FCTL_STYPE) {
		case IEEE80211_STYPE_PROBE_RESP:
			rma = ieee80211_rx_mgmt_probe_resp(wk, mgmt, skb->len,
							   rx_status);
			break;
		case IEEE80211_STYPE_AUTH:
			rma = ieee80211_rx_mgmt_auth(wk, mgmt, skb->len);
			break;
		case IEEE80211_STYPE_ASSOC_RESP:
			rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
							   skb->len, false);
			break;
		case IEEE80211_STYPE_REASSOC_RESP:
			rma = ieee80211_rx_mgmt_assoc_resp(wk, mgmt,
							   skb->len, true);
			break;
		default:
			WARN_ON(1);
		}
		/*
		 * We've processed this frame for that work, so it can't
		 * belong to another work struct.
		 * NB: this is also required for correctness for 'rma'!
		 */
		break;
	}

	switch (rma) {
	case WORK_ACT_NONE:
		break;
	case WORK_ACT_DONE:
		list_del_rcu(&wk->list);
		break;
	default:
		WARN(1, "unexpected: %d", rma);
	}

	mutex_unlock(&local->work_mtx);

	if (rma != WORK_ACT_DONE)
		goto out;

	switch (wk->done(wk, skb)) {
	case WORK_DONE_DESTROY:
		free_work(wk);
		break;
	case WORK_DONE_REQUEUE:
		synchronize_rcu();
767
		wk->started = false; /* restart */
768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794
		mutex_lock(&local->work_mtx);
		list_add_tail(&wk->list, &local->work_list);
		mutex_unlock(&local->work_mtx);
	}

 out:
	kfree_skb(skb);
}

static void ieee80211_work_timer(unsigned long data)
{
	struct ieee80211_local *local = (void *) data;

	if (local->quiescing)
		return;

	ieee80211_queue_work(&local->hw, &local->work_work);
}

static void ieee80211_work_work(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local, work_work);
	struct sk_buff *skb;
	struct ieee80211_work *wk, *tmp;
	LIST_HEAD(free_work);
	enum work_action rma;
795
	bool remain_off_channel = false;
796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815

	if (local->scanning)
		return;

	/*
	 * ieee80211_queue_work() should have picked up most cases,
	 * here we'll pick the the rest.
	 */
	if (WARN(local->suspended, "work scheduled while going to suspend\n"))
		return;

	/* first process frames to avoid timing out while a frame is pending */
	while ((skb = skb_dequeue(&local->work_skb_queue)))
		ieee80211_work_rx_queued_mgmt(local, skb);

	ieee80211_recalc_idle(local);

	mutex_lock(&local->work_mtx);

	list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
816 817 818 819 820
		/* mark work as started if it's on the current off-channel */
		if (!wk->started && local->tmp_channel &&
		    wk->chan == local->tmp_channel &&
		    wk->chan_type == local->tmp_channel_type) {
			wk->started = true;
821
			wk->timeout = jiffies;
822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844
		}

		if (!wk->started && !local->tmp_channel) {
			/*
			 * TODO: could optimize this by leaving the
			 *	 station vifs in awake mode if they
			 *	 happen to be on the same channel as
			 *	 the requested channel
			 */
			ieee80211_offchannel_stop_beaconing(local);
			ieee80211_offchannel_stop_station(local);

			local->tmp_channel = wk->chan;
			local->tmp_channel_type = wk->chan_type;
			ieee80211_hw_config(local, 0);
			wk->started = true;
			wk->timeout = jiffies;
		}

		/* don't try to work with items that aren't started */
		if (!wk->started)
			continue;

845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860
		if (time_is_after_jiffies(wk->timeout)) {
			/*
			 * This work item isn't supposed to be worked on
			 * right now, but take care to adjust the timer
			 * properly.
			 */
			run_again(local, wk->timeout);
			continue;
		}

		switch (wk->type) {
		default:
			WARN_ON(1);
			/* nothing */
			rma = WORK_ACT_NONE;
			break;
861 862
		case IEEE80211_WORK_ABORT:
			rma = WORK_ACT_TIMEOUT;
863 864 865 866 867 868 869 870 871
		case IEEE80211_WORK_DIRECT_PROBE:
			rma = ieee80211_direct_probe(wk);
			break;
		case IEEE80211_WORK_AUTH:
			rma = ieee80211_authenticate(wk);
			break;
		case IEEE80211_WORK_ASSOC:
			rma = ieee80211_associate(wk);
			break;
872 873 874
		case IEEE80211_WORK_REMAIN_ON_CHANNEL:
			rma = ieee80211_remain_on_channel_timeout(wk);
			break;
875 876 877 878
		}

		switch (rma) {
		case WORK_ACT_NONE:
879 880
			/* might have changed the timeout */
			run_again(local, wk->timeout);
881 882 883 884 885 886 887 888 889 890 891
			break;
		case WORK_ACT_TIMEOUT:
			list_del_rcu(&wk->list);
			synchronize_rcu();
			list_add(&wk->list, &free_work);
			break;
		default:
			WARN(1, "unexpected: %d", rma);
		}
	}

892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909
	list_for_each_entry(wk, &local->work_list, list) {
		if (!wk->started)
			continue;
		if (wk->chan != local->tmp_channel)
			continue;
		if (wk->chan_type != local->tmp_channel_type)
			continue;
		remain_off_channel = true;
	}

	if (!remain_off_channel && local->tmp_channel) {
		local->tmp_channel = NULL;
		ieee80211_hw_config(local, 0);
		ieee80211_offchannel_return(local, true);
		/* give connection some time to breathe */
		run_again(local, jiffies + HZ/2);
	}

910 911 912 913 914 915 916
	if (list_empty(&local->work_list) && local->scan_req)
		ieee80211_queue_delayed_work(&local->hw,
					     &local->scan_work,
					     round_jiffies_relative(0));

	mutex_unlock(&local->work_mtx);

917 918
	ieee80211_recalc_idle(local);

919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938
	list_for_each_entry_safe(wk, tmp, &free_work, list) {
		wk->done(wk, NULL);
		list_del(&wk->list);
		kfree(wk);
	}
}

void ieee80211_add_work(struct ieee80211_work *wk)
{
	struct ieee80211_local *local;

	if (WARN_ON(!wk->chan))
		return;

	if (WARN_ON(!wk->sdata))
		return;

	if (WARN_ON(!wk->done))
		return;

939 940 941
	if (WARN_ON(!ieee80211_sdata_running(wk->sdata)))
		return;

942
	wk->started = false;
943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964

	local = wk->sdata->local;
	mutex_lock(&local->work_mtx);
	list_add_tail(&wk->list, &local->work_list);
	mutex_unlock(&local->work_mtx);

	ieee80211_queue_work(&local->hw, &local->work_work);
}

void ieee80211_work_init(struct ieee80211_local *local)
{
	mutex_init(&local->work_mtx);
	INIT_LIST_HEAD(&local->work_list);
	setup_timer(&local->work_timer, ieee80211_work_timer,
		    (unsigned long)local);
	INIT_WORK(&local->work_work, ieee80211_work_work);
	skb_queue_head_init(&local->work_skb_queue);
}

void ieee80211_work_purge(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
965
	struct ieee80211_work *wk;
966 967

	mutex_lock(&local->work_mtx);
968
	list_for_each_entry(wk, &local->work_list, list) {
969 970
		if (wk->sdata != sdata)
			continue;
971
		wk->type = IEEE80211_WORK_ABORT;
972 973
		wk->started = true;
		wk->timeout = jiffies;
974 975 976 977 978 979 980 981 982 983 984 985
	}
	mutex_unlock(&local->work_mtx);

	/* run cleanups etc. */
	ieee80211_work_work(&local->work_work);

	mutex_lock(&local->work_mtx);
	list_for_each_entry(wk, &local->work_list, list) {
		if (wk->sdata != sdata)
			continue;
		WARN_ON(1);
		break;
986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026
	}
	mutex_unlock(&local->work_mtx);
}

ieee80211_rx_result ieee80211_work_rx_mgmt(struct ieee80211_sub_if_data *sdata,
					   struct sk_buff *skb)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_mgmt *mgmt;
	struct ieee80211_work *wk;
	u16 fc;

	if (skb->len < 24)
		return RX_DROP_MONITOR;

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

	list_for_each_entry_rcu(wk, &local->work_list, list) {
		if (sdata != wk->sdata)
			continue;
		if (compare_ether_addr(wk->filter_ta, mgmt->sa))
			continue;
		if (compare_ether_addr(wk->filter_ta, mgmt->bssid))
			continue;

		switch (fc & IEEE80211_FCTL_STYPE) {
		case IEEE80211_STYPE_AUTH:
		case IEEE80211_STYPE_PROBE_RESP:
		case IEEE80211_STYPE_ASSOC_RESP:
		case IEEE80211_STYPE_REASSOC_RESP:
		case IEEE80211_STYPE_DEAUTH:
		case IEEE80211_STYPE_DISASSOC:
			skb_queue_tail(&local->work_skb_queue, skb);
			ieee80211_queue_work(&local->hw, &local->work_work);
			return RX_QUEUED;
		}
	}

	return RX_CONTINUE;
}
1027

1028 1029 1030 1031 1032 1033
static enum work_done_result ieee80211_remain_done(struct ieee80211_work *wk,
						   struct sk_buff *skb)
{
	/*
	 * We are done serving the remain-on-channel command.
	 */
1034
	cfg80211_remain_on_channel_expired(wk->sdata->dev, (unsigned long) wk,
1035 1036 1037 1038 1039 1040
					   wk->chan, wk->chan_type,
					   GFP_KERNEL);

	return WORK_DONE_DESTROY;
}

1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_channel *chan,
				   enum nl80211_channel_type channel_type,
				   unsigned int duration, u64 *cookie)
{
	struct ieee80211_work *wk;

	wk = kzalloc(sizeof(*wk), GFP_KERNEL);
	if (!wk)
		return -ENOMEM;

	wk->type = IEEE80211_WORK_REMAIN_ON_CHANNEL;
	wk->chan = chan;
1054
	wk->chan_type = channel_type;
1055
	wk->sdata = sdata;
1056
	wk->done = ieee80211_remain_done;
1057

1058
	wk->remain.duration = duration;
1059

1060
	*cookie = (unsigned long) wk;
1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075

	ieee80211_add_work(wk);

	return 0;
}

int ieee80211_wk_cancel_remain_on_channel(struct ieee80211_sub_if_data *sdata,
					  u64 cookie)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_work *wk, *tmp;
	bool found = false;

	mutex_lock(&local->work_mtx);
	list_for_each_entry_safe(wk, tmp, &local->work_list, list) {
1076
		if ((unsigned long) wk == cookie) {
1077
			wk->timeout = jiffies;
1078 1079 1080 1081 1082 1083 1084 1085 1086
			found = true;
			break;
		}
	}
	mutex_unlock(&local->work_mtx);

	if (!found)
		return -ENOENT;

1087
	ieee80211_queue_work(&local->hw, &local->work_work);
1088 1089 1090

	return 0;
}