mlme.c 74.0 KB
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/*
 * BSS client mode implementation
 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.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>
 *
 * 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/wireless.h>
#include <linux/random.h>
#include <linux/etherdevice.h>
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#include <linux/rtnetlink.h>
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#include <net/iw_handler.h>
#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 "rate.h"
#include "led.h"
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#define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
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#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_MONITORING_INTERVAL (2 * HZ)
#define IEEE80211_PROBE_INTERVAL (60 * HZ)
#define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
#define IEEE80211_SCAN_INTERVAL (2 * HZ)
#define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
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#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
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#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)

#define IEEE80211_IBSS_MAX_STA_ENTRIES 128


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/* utils */
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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static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
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{
	u8 *end, *pos;

	pos = bss->ies;
	if (pos == NULL)
		return NULL;
	end = pos + bss->ies_len;

	while (pos + 1 < end) {
		if (pos + 2 + pos[1] > end)
			break;
		if (pos[0] == ie)
			return pos;
		pos += 2 + pos[1];
	}

	return NULL;
}

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static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
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				      struct ieee80211_supported_band *sband,
				      u64 *rates)
{
	int i, j, count;
	*rates = 0;
	count = 0;
	for (i = 0; i < bss->supp_rates_len; i++) {
		int rate = (bss->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;
}

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/* also used by mesh code */
u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
			    struct ieee802_11_elems *elems,
			    enum ieee80211_band band)
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{
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	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *bitrates;
	size_t num_rates;
	u64 supp_rates;
	int i, j;
	sband = local->hw.wiphy->bands[band];
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	if (!sband) {
		WARN_ON(1);
		sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
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	}

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	bitrates = sband->bitrates;
	num_rates = sband->n_bitrates;
	supp_rates = 0;
	for (i = 0; i < elems->supp_rates_len +
		     elems->ext_supp_rates_len; i++) {
		u8 rate = 0;
		int own_rate;
		if (i < elems->supp_rates_len)
			rate = elems->supp_rates[i];
		else if (elems->ext_supp_rates)
			rate = elems->ext_supp_rates
				[i - elems->supp_rates_len];
		own_rate = 5 * (rate & 0x7f);
		for (j = 0; j < num_rates; j++)
			if (bitrates[j].bitrate == own_rate)
				supp_rates |= BIT(j);
	}
	return supp_rates;
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}

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/* frame sending functions */

/* also used by scanning code */
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void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
			      u8 *ssid, size_t ssid_len)
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{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u8 *pos, *supp_rates, *esupp_rates = NULL;
	int i;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
		       "request\n", sdata->dev->name);
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_PROBE_REQ);
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
	if (dst) {
		memcpy(mgmt->da, dst, ETH_ALEN);
		memcpy(mgmt->bssid, dst, ETH_ALEN);
	} else {
		memset(mgmt->da, 0xff, ETH_ALEN);
		memset(mgmt->bssid, 0xff, ETH_ALEN);
	}
	pos = skb_put(skb, 2 + ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
	memcpy(pos, ssid, ssid_len);

	supp_rates = skb_put(skb, 2);
	supp_rates[0] = WLAN_EID_SUPP_RATES;
	supp_rates[1] = 0;
	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

	for (i = 0; i < sband->n_bitrates; i++) {
		struct ieee80211_rate *rate = &sband->bitrates[i];
		if (esupp_rates) {
			pos = skb_put(skb, 1);
			esupp_rates[1]++;
		} else if (supp_rates[1] == 8) {
			esupp_rates = skb_put(skb, 3);
			esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
			esupp_rates[1] = 1;
			pos = &esupp_rates[2];
		} else {
			pos = skb_put(skb, 1);
			supp_rates[1]++;
		}
		*pos = rate->bitrate / 5;
	}

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	ieee80211_tx_skb(sdata, skb, 0);
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}

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static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
				struct ieee80211_if_sta *ifsta,
				int transaction, u8 *extra, size_t extra_len,
				int encrypt)
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
			    sizeof(*mgmt) + 6 + extra_len);
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
		       "frame\n", sdata->dev->name);
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
	memset(mgmt, 0, 24 + 6);
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_AUTH);
	if (encrypt)
		mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
	memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
	mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
	mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
	ifsta->auth_transaction = transaction + 1;
	mgmt->u.auth.status_code = cpu_to_le16(0);
	if (extra)
		memcpy(skb_put(skb, extra_len), extra, extra_len);

	ieee80211_tx_skb(sdata, skb, encrypt);
}

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static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
				 struct ieee80211_if_sta *ifsta)
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
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	u8 *pos, *ies, *ht_ie;
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	int i, len, count, rates_len, supp_rates_len;
	u16 capab;
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	struct ieee80211_bss *bss;
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	int wmm = 0;
	struct ieee80211_supported_band *sband;
	u64 rates = 0;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
			    sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
			    ifsta->ssid_len);
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
		       "frame\n", sdata->dev->name);
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

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

	capab = ifsta->capab;

	if (local->hw.conf.channel->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;
	}

	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
				   local->hw.conf.channel->center_freq,
				   ifsta->ssid, ifsta->ssid_len);
	if (bss) {
		if (bss->capability & WLAN_CAPABILITY_PRIVACY)
			capab |= WLAN_CAPABILITY_PRIVACY;
		if (bss->wmm_used)
			wmm = 1;

		/* 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(bss, sband, &rates);

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

		ieee80211_rx_bss_put(local, bss);
	} else {
		rates = ~0;
		rates_len = sband->n_bitrates;
	}

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
	memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);

	if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
		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, ifsta->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);
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		mgmt->u.assoc_req.listen_interval =
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				cpu_to_le16(local->hw.conf.listen_interval);
	}

	/* SSID */
	ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ifsta->ssid_len;
	memcpy(pos, ifsta->ssid, ifsta->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 */
		*pos++ = local->hw.conf.channel->max_power; /* max tx power */

		/* 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*/
		}
	}

	if (ifsta->extra_ie) {
		pos = skb_put(skb, ifsta->extra_ie_len);
		memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
	}

	if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
		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;
	}

	/* wmm support is a must to HT */
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	/*
	 * 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.
	 */
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	if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
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	    sband->ht_cap.ht_supported &&
	    (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
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	    ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
	    (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
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		struct ieee80211_ht_info *ht_info =
			(struct ieee80211_ht_info *)(ht_ie + 2);
		u16 cap = sband->ht_cap.cap;
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		__le16 tmp;
		u32 flags = local->hw.conf.channel->flags;

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		switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
		case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
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			if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
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				cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
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				cap &= ~IEEE80211_HT_CAP_SGI_40;
			}
			break;
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		case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
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			if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
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				cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
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				cap &= ~IEEE80211_HT_CAP_SGI_40;
			}
			break;
		}

		tmp = cpu_to_le16(cap);
		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));
		memcpy(pos, &tmp, sizeof(u16));
		pos += sizeof(u16);
		/* TODO: needs a define here for << 2 */
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		*pos++ = sband->ht_cap.ampdu_factor |
			 (sband->ht_cap.ampdu_density << 2);
		memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
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	}

	kfree(ifsta->assocreq_ies);
	ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
	ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
	if (ifsta->assocreq_ies)
		memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);

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	ieee80211_tx_skb(sdata, skb, 0);
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}


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static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
					   u16 stype, u16 reason)
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{
	struct ieee80211_local *local = sdata->local;
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	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
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	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
	if (!skb) {
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		printk(KERN_DEBUG "%s: failed to allocate buffer for "
		       "deauth/disassoc frame\n", sdata->dev->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);
	memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
	memcpy(mgmt->bssid, ifsta->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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	ieee80211_tx_skb(sdata, skb, 0);
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}

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/* MLME */
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static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
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					 struct ieee80211_bss *bss)
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{
	struct ieee80211_local *local = sdata->local;
	int i, have_higher_than_11mbit = 0;

	/* cf. IEEE 802.11 9.2.12 */
	for (i = 0; i < bss->supp_rates_len; i++)
		if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
			have_higher_than_11mbit = 1;

	if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
	    have_higher_than_11mbit)
		sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
	else
		sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

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	ieee80211_set_wmm_default(sdata);
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}

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static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
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				     struct ieee80211_if_sta *ifsta,
				     u8 *wmm_param, size_t wmm_param_len)
{
	struct ieee80211_tx_queue_params params;
	size_t left;
	int count;
	u8 *pos;

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	if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
		return;

	if (!wmm_param)
		return;

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	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
		return;
	count = wmm_param[6] & 0x0f;
	if (count == ifsta->wmm_last_param_set)
		return;
	ifsta->wmm_last_param_set = count;

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

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

	if (!local->ops->conf_tx)
		return;

	local->wmm_acm = 0;
	for (; left >= 4; left -= 4, pos += 4) {
		int aci = (pos[0] >> 5) & 0x03;
		int acm = (pos[0] >> 4) & 0x01;
		int queue;

		switch (aci) {
		case 1:
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			queue = 3;
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			if (acm)
539 540 541
				local->wmm_acm |= BIT(0) | BIT(3);
			break;
		case 2:
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542
			queue = 1;
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543
			if (acm)
544 545 546
				local->wmm_acm |= BIT(4) | BIT(5);
			break;
		case 3:
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547
			queue = 0;
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548
			if (acm)
549 550 551 552
				local->wmm_acm |= BIT(6) | BIT(7);
			break;
		case 0:
		default:
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553
			queue = 2;
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554
			if (acm)
555 556 557 558 559 560 561
				local->wmm_acm |= BIT(1) | BIT(2);
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
562
		params.txop = get_unaligned_le16(pos + 2);
563
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
564
		printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
565
		       "cWmin=%d cWmax=%d txop=%d\n",
566
		       local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
567 568
		       params.cw_max, params.txop);
#endif
569 570 571 572
		/* TODO: handle ACM (block TX, fallback to next lowest allowed
		 * AC for now) */
		if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
			printk(KERN_DEBUG "%s: failed to set TX queue "
573
			       "parameters for queue %d\n", local->mdev->name, queue);
574 575 576 577
		}
	}
}

578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601
static bool check_tim(struct ieee802_11_elems *elems, u16 aid, bool *is_mc)
{
	u8 mask;
	u8 index, indexn1, indexn2;
	struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;

	aid &= 0x3fff;
	index = aid / 8;
	mask  = 1 << (aid & 7);

	if (tim->bitmap_ctrl & 0x01)
		*is_mc = true;

	indexn1 = tim->bitmap_ctrl & 0xfe;
	indexn2 = elems->tim_len + indexn1 - 4;

	if (index < indexn1 || index > indexn2)
		return false;

	index -= indexn1;

	return !!(tim->virtual_map[index] & mask);
}

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static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
604
{
J
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605
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
606
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
607
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
608
#endif
609
	u32 changed = 0;
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610 611 612 613 614 615 616 617 618 619 620 621 622
	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);
623

624
	if (use_protection != bss_conf->use_cts_prot) {
625
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
626
		if (net_ratelimit()) {
627
			printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
628
			       sdata->dev->name,
629
			       use_protection ? "enabled" : "disabled",
630
			       ifsta->bssid);
631
		}
632
#endif
633 634
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
635
	}
636

637
	if (use_short_preamble != bss_conf->use_short_preamble) {
638
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
639 640
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: switched to %s barker preamble"
641
			       " (BSSID=%pM)\n",
642
			       sdata->dev->name,
643
			       use_short_preamble ? "short" : "long",
644
			       ifsta->bssid);
645
		}
646
#endif
647
		bss_conf->use_short_preamble = use_short_preamble;
648
		changed |= BSS_CHANGED_ERP_PREAMBLE;
649
	}
650

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651 652 653
	if (use_short_slot != bss_conf->use_short_slot) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit()) {
654 655
			printk(KERN_DEBUG "%s: switched to %s slot time"
			       " (BSSID=%pM)\n",
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656 657 658 659 660 661 662
			       sdata->dev->name,
			       use_short_slot ? "short" : "long",
			       ifsta->bssid);
		}
#endif
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
663 664 665 666 667
	}

	return changed;
}

668 669 670 671 672 673 674 675 676 677 678
static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
					struct ieee80211_if_sta *ifsta)
{
	union iwreq_data wrqu;
	memset(&wrqu, 0, sizeof(wrqu));
	if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
		memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
	wrqu.ap_addr.sa_family = ARPHRD_ETHER;
	wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
}

679
static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
680 681
					 struct ieee80211_if_sta *ifsta)
{
682 683 684
	char *buf;
	size_t len;
	int i;
685 686
	union iwreq_data wrqu;

687 688 689 690 691 692 693 694 695
	if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
		return;

	buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
				ifsta->assocresp_ies_len), GFP_KERNEL);
	if (!buf)
		return;

	len = sprintf(buf, "ASSOCINFO(");
696
	if (ifsta->assocreq_ies) {
697 698 699 700 701
		len += sprintf(buf + len, "ReqIEs=");
		for (i = 0; i < ifsta->assocreq_ies_len; i++) {
			len += sprintf(buf + len, "%02x",
				       ifsta->assocreq_ies[i]);
		}
702
	}
703
	if (ifsta->assocresp_ies) {
704 705 706 707 708 709 710
		if (ifsta->assocreq_ies)
			len += sprintf(buf + len, " ");
		len += sprintf(buf + len, "RespIEs=");
		for (i = 0; i < ifsta->assocresp_ies_len; i++) {
			len += sprintf(buf + len, "%02x",
				       ifsta->assocresp_ies[i]);
		}
711
	}
712 713 714 715 716 717 718 719 720 721
	len += sprintf(buf + len, ")");

	if (len > IW_CUSTOM_MAX) {
		len = sprintf(buf, "ASSOCRESPIE=");
		for (i = 0; i < ifsta->assocresp_ies_len; i++) {
			len += sprintf(buf + len, "%02x",
				       ifsta->assocresp_ies[i]);
		}
	}

722 723 724 725 726
	if (len <= IW_CUSTOM_MAX) {
		memset(&wrqu, 0, sizeof(wrqu));
		wrqu.data.length = len;
		wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
	}
727 728

	kfree(buf);
729 730 731
}


732
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
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733 734
				     struct ieee80211_if_sta *ifsta,
				     u32 bss_info_changed)
735
{
736
	struct ieee80211_local *local = sdata->local;
T
Tomas Winkler 已提交
737
	struct ieee80211_conf *conf = &local_to_hw(local)->conf;
738

739
	struct ieee80211_bss *bss;
740

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741
	bss_info_changed |= BSS_CHANGED_ASSOC;
742
	ifsta->flags |= IEEE80211_STA_ASSOCIATED;
743

744
	if (sdata->vif.type != NL80211_IFTYPE_STATION)
745
		return;
746

747 748 749 750 751
	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
				   conf->channel->center_freq,
				   ifsta->ssid, ifsta->ssid_len);
	if (bss) {
		/* set timing information */
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752 753 754
		sdata->vif.bss_conf.beacon_int = bss->beacon_int;
		sdata->vif.bss_conf.timestamp = bss->timestamp;
		sdata->vif.bss_conf.dtim_period = bss->dtim_period;
755

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756
		bss_info_changed |= ieee80211_handle_bss_capability(sdata,
J
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757
			bss->capability, bss->has_erp_value, bss->erp_value);
758 759

		ieee80211_rx_bss_put(local, bss);
760 761
	}

762 763 764
	ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
	memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
	ieee80211_sta_send_associnfo(sdata, ifsta);
765

766 767
	ifsta->last_probe = jiffies;
	ieee80211_led_assoc(local, 1);
768

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769
	sdata->vif.bss_conf.assoc = 1;
770 771 772 773 774
	/*
	 * 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.
	 */
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775 776
	bss_info_changed |= BSS_CHANGED_BASIC_RATES;
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
777

778 779
	if (local->powersave &&
			!(local->hw.flags & IEEE80211_HW_NO_STACK_DYNAMIC_PS)) {
780
		if (local->hw.conf.dynamic_ps_timeout > 0)
781
			mod_timer(&local->dynamic_ps_timer, jiffies +
782 783
				  msecs_to_jiffies(
					local->hw.conf.dynamic_ps_timeout));
784
		else {
785
			ieee80211_send_nullfunc(local, sdata, 1);
786 787 788 789
			conf->flags |= IEEE80211_CONF_PS;
			ieee80211_hw_config(local,
					    IEEE80211_CONF_CHANGE_PS);
		}
790 791
	}

792 793
	netif_tx_start_all_queues(sdata->dev);
	netif_carrier_on(sdata->dev);
794

795
	ieee80211_sta_send_apinfo(sdata, ifsta);
796 797
}

798 799
static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_if_sta *ifsta)
800
{
801 802
	ifsta->direct_probe_tries++;
	if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
803 804
		printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
		       sdata->dev->name, ifsta->bssid);
805
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
806
		ieee80211_sta_send_apinfo(sdata, ifsta);
807 808 809
		return;
	}

810 811
	printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
			sdata->dev->name, ifsta->bssid,
812
			ifsta->direct_probe_tries);
813

814
	ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
815

816 817 818 819 820 821 822 823 824
	set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);

	/* 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,
				 ifsta->ssid, ifsta->ssid_len);

	mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
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Johannes Berg 已提交
825
}
826

827 828 829

static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_if_sta *ifsta)
830
{
831 832
	ifsta->auth_tries++;
	if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
833
		printk(KERN_DEBUG "%s: authentication with AP %pM"
834
		       " timed out\n",
835
		       sdata->dev->name, ifsta->bssid);
836
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
837
		ieee80211_sta_send_apinfo(sdata, ifsta);
838 839 840
		return;
	}

841
	ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
842 843
	printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
	       sdata->dev->name, ifsta->bssid);
844

845 846 847
	ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);

	mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
848 849
}

850 851 852 853
/*
 * The disassoc 'reason' argument can be either our own reason
 * if self disconnected or a reason code from the AP.
 */
854 855 856 857 858 859
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_if_sta *ifsta, bool deauth,
				   bool self_disconnected, u16 reason)
{
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
860
	u32 changed = 0, config_changed = 0;
861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876

	rcu_read_lock();

	sta = sta_info_get(local, ifsta->bssid);
	if (!sta) {
		rcu_read_unlock();
		return;
	}

	if (deauth) {
		ifsta->direct_probe_tries = 0;
		ifsta->auth_tries = 0;
	}
	ifsta->assoc_scan_tries = 0;
	ifsta->assoc_tries = 0;

877
	netif_tx_stop_all_queues(sdata->dev);
878 879
	netif_carrier_off(sdata->dev);

880
	ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
881 882 883

	if (self_disconnected) {
		if (deauth)
884 885
			ieee80211_send_deauth_disassoc(sdata,
				IEEE80211_STYPE_DEAUTH, reason);
886
		else
887 888
			ieee80211_send_deauth_disassoc(sdata,
				IEEE80211_STYPE_DISASSOC, reason);
889 890
	}

891 892 893 894
	ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
J
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895 896
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
897 898

	ieee80211_sta_send_apinfo(sdata, ifsta);
899

900
	if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT)
901 902 903 904
		ifsta->state = IEEE80211_STA_MLME_DISABLED;

	rcu_read_unlock();

905
	/* channel(_type) changes are handled by ieee80211_hw_config */
S
Sujith 已提交
906
	local->oper_channel_type = NL80211_CHAN_NO_HT;
907

908 909 910
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

911 912 913 914
	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
915

916
	ieee80211_hw_config(local, config_changed);
J
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917
	ieee80211_bss_info_change_notify(sdata, changed);
918 919 920 921 922 923 924 925 926 927 928 929 930 931

	rcu_read_lock();

	sta = sta_info_get(local, ifsta->bssid);
	if (!sta) {
		rcu_read_unlock();
		return;
	}

	sta_info_unlink(&sta);

	rcu_read_unlock();

	sta_info_destroy(sta);
932
}
933

934 935 936 937 938 939 940 941
static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
{
	if (!sdata || !sdata->default_key ||
	    sdata->default_key->conf.alg != ALG_WEP)
		return 0;
	return 1;
}

942
static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
943 944
				      struct ieee80211_if_sta *ifsta)
{
945
	struct ieee80211_local *local = sdata->local;
946
	struct ieee80211_bss *bss;
947 948 949
	int bss_privacy;
	int wep_privacy;
	int privacy_invoked;
950

951
	if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
952 953
		return 0;

954
	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
955
				   local->hw.conf.channel->center_freq,
956
				   ifsta->ssid, ifsta->ssid_len);
957 958 959
	if (!bss)
		return 0;

960
	bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
961
	wep_privacy = !!ieee80211_sta_wep_configured(sdata);
962
	privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
963

964
	ieee80211_rx_bss_put(local, bss);
965

966 967 968 969
	if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
		return 0;

	return 1;
970 971
}

972
static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
973 974 975 976
				struct ieee80211_if_sta *ifsta)
{
	ifsta->assoc_tries++;
	if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
977
		printk(KERN_DEBUG "%s: association with AP %pM"
978
		       " timed out\n",
979
		       sdata->dev->name, ifsta->bssid);
980
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
981
		ieee80211_sta_send_apinfo(sdata, ifsta);
982 983 984
		return;
	}

985
	ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
986 987
	printk(KERN_DEBUG "%s: associate with AP %pM\n",
	       sdata->dev->name, ifsta->bssid);
988
	if (ieee80211_privacy_mismatch(sdata, ifsta)) {
989
		printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
990
		       "mixed-cell disabled - abort association\n", sdata->dev->name);
991
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
992 993 994
		return;
	}

995
	ieee80211_send_assoc(sdata, ifsta);
996 997 998 999 1000

	mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
}


1001
static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1002 1003
				 struct ieee80211_if_sta *ifsta)
{
1004
	struct ieee80211_local *local = sdata->local;
1005 1006 1007 1008 1009 1010 1011 1012
	struct sta_info *sta;
	int disassoc;

	/* TODO: start monitoring current AP signal quality and number of
	 * missed beacons. Scan other channels every now and then and search
	 * for better APs. */
	/* TODO: remove expired BSSes */

1013
	ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1014

1015 1016
	rcu_read_lock();

1017 1018
	sta = sta_info_get(local, ifsta->bssid);
	if (!sta) {
1019 1020
		printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
		       sdata->dev->name, ifsta->bssid);
1021 1022 1023 1024 1025
		disassoc = 1;
	} else {
		disassoc = 0;
		if (time_after(jiffies,
			       sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1026
			if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1027
				printk(KERN_DEBUG "%s: No ProbeResp from "
1028
				       "current AP %pM - assume out of "
1029
				       "range\n",
1030
				       sdata->dev->name, ifsta->bssid);
1031
				disassoc = 1;
1032
			} else
1033
				ieee80211_send_probe_req(sdata, ifsta->bssid,
1034 1035
							 ifsta->ssid,
							 ifsta->ssid_len);
1036
			ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1037
		} else {
1038
			ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1039 1040 1041
			if (time_after(jiffies, ifsta->last_probe +
				       IEEE80211_PROBE_INTERVAL)) {
				ifsta->last_probe = jiffies;
1042
				ieee80211_send_probe_req(sdata, ifsta->bssid,
1043 1044 1045 1046 1047
							 ifsta->ssid,
							 ifsta->ssid_len);
			}
		}
	}
1048 1049 1050

	rcu_read_unlock();

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Johannes Berg 已提交
1051 1052 1053 1054 1055 1056
	if (disassoc)
		ieee80211_set_disassoc(sdata, ifsta, true, true,
					WLAN_REASON_PREV_AUTH_NOT_VALID);
	else
		mod_timer(&ifsta->timer, jiffies +
				      IEEE80211_MONITORING_INTERVAL);
1057 1058 1059
}


1060
static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1061 1062
				     struct ieee80211_if_sta *ifsta)
{
1063
	printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1064
	ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1065
	ieee80211_associate(sdata, ifsta);
1066 1067 1068
}


1069
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1070 1071 1072 1073 1074 1075 1076 1077
				     struct ieee80211_if_sta *ifsta,
				     struct ieee80211_mgmt *mgmt,
				     size_t len)
{
	u8 *pos;
	struct ieee802_11_elems elems;

	pos = mgmt->u.auth.variable;
1078
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1079
	if (!elems.challenge)
1080
		return;
1081
	ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1082 1083 1084
			    elems.challenge_len + 2, 1);
}

1085
static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1086 1087 1088 1089 1090 1091
				   struct ieee80211_if_sta *ifsta,
				   struct ieee80211_mgmt *mgmt,
				   size_t len)
{
	u16 auth_alg, auth_transaction, status_code;

1092
	if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1093
	    sdata->vif.type != NL80211_IFTYPE_ADHOC)
1094 1095
		return;

1096
	if (len < 24 + 6)
1097 1098
		return;

1099
	if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1100
	    memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1101 1102
		return;

1103
	if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1104
	    memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1105 1106 1107 1108 1109 1110
		return;

	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);

1111
	if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
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1112 1113
		/*
		 * IEEE 802.11 standard does not require authentication in IBSS
1114 1115 1116
		 * networks and most implementations do not seem to use it.
		 * However, try to reply to authentication attempts if someone
		 * has actually implemented this.
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1117
		 */
1118
		if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1119
			return;
1120
		ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1121 1122 1123
	}

	if (auth_alg != ifsta->auth_alg ||
1124
	    auth_transaction != ifsta->auth_transaction)
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152
		return;

	if (status_code != WLAN_STATUS_SUCCESS) {
		if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
			u8 algs[3];
			const int num_algs = ARRAY_SIZE(algs);
			int i, pos;
			algs[0] = algs[1] = algs[2] = 0xff;
			if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
				algs[0] = WLAN_AUTH_OPEN;
			if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
				algs[1] = WLAN_AUTH_SHARED_KEY;
			if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
				algs[2] = WLAN_AUTH_LEAP;
			if (ifsta->auth_alg == WLAN_AUTH_OPEN)
				pos = 0;
			else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
				pos = 1;
			else
				pos = 2;
			for (i = 0; i < num_algs; i++) {
				pos++;
				if (pos >= num_algs)
					pos = 0;
				if (algs[pos] == ifsta->auth_alg ||
				    algs[pos] == 0xff)
					continue;
				if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1153
				    !ieee80211_sta_wep_configured(sdata))
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164
					continue;
				ifsta->auth_alg = algs[pos];
				break;
			}
		}
		return;
	}

	switch (ifsta->auth_alg) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
1165
		ieee80211_auth_completed(sdata, ifsta);
1166 1167 1168
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifsta->auth_transaction == 4)
1169
			ieee80211_auth_completed(sdata, ifsta);
1170
		else
1171
			ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1172 1173 1174 1175 1176
		break;
	}
}


1177
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1178 1179 1180 1181 1182 1183
				     struct ieee80211_if_sta *ifsta,
				     struct ieee80211_mgmt *mgmt,
				     size_t len)
{
	u16 reason_code;

1184
	if (len < 24 + 2)
1185 1186
		return;

1187
	if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1188 1189 1190 1191
		return;

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

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1192
	if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1193 1194
		printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
				sdata->dev->name, reason_code);
1195

1196 1197 1198
	if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
	    ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
	    ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1199
		ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1200 1201 1202 1203
		mod_timer(&ifsta->timer, jiffies +
				      IEEE80211_RETRY_AUTH_INTERVAL);
	}

1204
	ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1205
	ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1206 1207 1208
}


1209
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1210 1211 1212 1213 1214 1215
				       struct ieee80211_if_sta *ifsta,
				       struct ieee80211_mgmt *mgmt,
				       size_t len)
{
	u16 reason_code;

1216
	if (len < 24 + 2)
1217 1218
		return;

1219
	if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1220 1221 1222 1223
		return;

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

1224
	if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1225 1226
		printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
				sdata->dev->name, reason_code);
1227

1228 1229
	if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
		ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1230 1231 1232 1233
		mod_timer(&ifsta->timer, jiffies +
				      IEEE80211_RETRY_AUTH_INTERVAL);
	}

1234
	ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1235 1236 1237
}


1238
static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1239 1240 1241 1242 1243
					 struct ieee80211_if_sta *ifsta,
					 struct ieee80211_mgmt *mgmt,
					 size_t len,
					 int reassoc)
{
1244
	struct ieee80211_local *local = sdata->local;
1245
	struct ieee80211_supported_band *sband;
1246
	struct sta_info *sta;
1247
	u64 rates, basic_rates;
1248 1249
	u16 capab_info, status_code, aid;
	struct ieee802_11_elems elems;
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1250
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1251
	u8 *pos;
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1252
	u32 changed = 0;
1253
	int i, j;
1254
	bool have_higher_than_11mbit = false, newsta = false;
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1255
	u16 ap_ht_cap_flags;
1256 1257 1258 1259

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

1260
	if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1261 1262
		return;

1263
	if (len < 24 + 6)
1264 1265
		return;

1266
	if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1267 1268 1269 1270 1271 1272
		return;

	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);

1273
	printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1274
	       "status=%d aid=%d)\n",
1275
	       sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1276
	       capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1277 1278 1279

	if (status_code != WLAN_STATUS_SUCCESS) {
		printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1280
		       sdata->dev->name, status_code);
1281 1282 1283
		/* if this was a reassociation, ensure we try a "full"
		 * association next time. This works around some broken APs
		 * which do not correctly reject reassociation requests. */
1284
		ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1285 1286 1287
		return;
	}

1288 1289
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
		printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1290
		       "set\n", sdata->dev->name, aid);
1291 1292
	aid &= ~(BIT(15) | BIT(14));

1293
	pos = mgmt->u.assoc_resp.variable;
1294
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1295 1296 1297

	if (!elems.supp_rates) {
		printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1298
		       sdata->dev->name);
1299 1300 1301
		return;
	}

1302
	printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1303 1304 1305 1306 1307
	ifsta->aid = aid;
	ifsta->ap_capab = capab_info;

	kfree(ifsta->assocresp_ies);
	ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1308
	ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1309 1310 1311
	if (ifsta->assocresp_ies)
		memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);

1312 1313
	rcu_read_lock();

1314 1315 1316
	/* Add STA entry for the AP */
	sta = sta_info_get(local, ifsta->bssid);
	if (!sta) {
1317
		struct ieee80211_bss *bss;
1318 1319

		newsta = true;
1320

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1321 1322 1323
		sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
		if (!sta) {
			printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1324
			       " the AP\n", sdata->dev->name);
1325
			rcu_read_unlock();
1326 1327
			return;
		}
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1328 1329 1330 1331 1332 1333 1334 1335 1336
		bss = ieee80211_rx_bss_get(local, ifsta->bssid,
					   local->hw.conf.channel->center_freq,
					   ifsta->ssid, ifsta->ssid_len);
		if (bss) {
			sta->last_signal = bss->signal;
			sta->last_qual = bss->qual;
			sta->last_noise = bss->noise;
			ieee80211_rx_bss_put(local, bss);
		}
1337

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1338 1339
		/* update new sta with its last rx activity */
		sta->last_rx = jiffies;
1340 1341
	}

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1342 1343 1344 1345 1346 1347 1348 1349 1350
	/*
	 * FIXME: Do we really need to update the sta_info's information here?
	 *	  We already know about the AP (we found it in our list) so it
	 *	  should already be filled with the right info, no?
	 *	  As is stands, all this is racy because typically we assume
	 *	  the information that is filled in here (except flags) doesn't
	 *	  change while a STA structure is alive. As such, it should move
	 *	  to between the sta_info_alloc() and sta_info_insert() above.
	 */
1351

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1352 1353
	set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
			   WLAN_STA_AUTHORIZED);
1354

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1355 1356 1357
	rates = 0;
	basic_rates = 0;
	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1358

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1359 1360
	for (i = 0; i < elems.supp_rates_len; i++) {
		int rate = (elems.supp_rates[i] & 0x7f) * 5;
1361
		bool is_basic = !!(elems.supp_rates[i] & 0x80);
1362

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1363 1364 1365 1366
		if (rate > 110)
			have_higher_than_11mbit = true;

		for (j = 0; j < sband->n_bitrates; j++) {
1367
			if (sband->bitrates[j].bitrate == rate) {
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1368
				rates |= BIT(j);
1369 1370 1371 1372
				if (is_basic)
					basic_rates |= BIT(j);
				break;
			}
1373 1374 1375
		}
	}

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1376 1377
	for (i = 0; i < elems.ext_supp_rates_len; i++) {
		int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1378
		bool is_basic = !!(elems.supp_rates[i] & 0x80);
1379

J
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1380 1381
		if (rate > 110)
			have_higher_than_11mbit = true;
1382

J
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1383
		for (j = 0; j < sband->n_bitrates; j++) {
1384
			if (sband->bitrates[j].bitrate == rate) {
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Johannes Berg 已提交
1385
				rates |= BIT(j);
1386 1387 1388 1389
				if (is_basic)
					basic_rates |= BIT(j);
				break;
			}
J
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1390
		}
1391
	}
1392

J
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1393
	sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
J
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1394
	sdata->vif.bss_conf.basic_rates = basic_rates;
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1395 1396 1397 1398 1399 1400 1401

	/* cf. IEEE 802.11 9.2.12 */
	if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
	    have_higher_than_11mbit)
		sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
	else
		sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1402

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1403 1404
	if (elems.ht_cap_elem)
		ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
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1405
				elems.ht_cap_elem, &sta->sta.ht_cap);
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1406 1407

	ap_ht_cap_flags = sta->sta.ht_cap.cap;
1408

1409
	rate_control_rate_init(sta);
1410

1411
	if (elems.wmm_param)
J
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1412
		set_sta_flags(sta, WLAN_STA_WME);
1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426

	if (newsta) {
		int err = sta_info_insert(sta);
		if (err) {
			printk(KERN_DEBUG "%s: failed to insert STA entry for"
			       " the AP (error %d)\n", sdata->dev->name, err);
			rcu_read_unlock();
			return;
		}
	}

	rcu_read_unlock();

	if (elems.wmm_param)
J
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1427 1428
		ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
					 elems.wmm_param_len);
1429

J
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1430 1431 1432 1433 1434
	if (elems.ht_info_elem && elems.wmm_param &&
	    (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
		changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
					       ap_ht_cap_flags);

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1435 1436 1437 1438
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
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1439
	ieee80211_set_associated(sdata, ifsta, changed);
1440

J
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1441
	ieee80211_associated(sdata, ifsta);
1442 1443 1444
}


1445
static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1446
				   struct ieee80211_if_sta *ifsta,
1447
				   struct ieee80211_bss *bss)
1448
{
1449
	struct ieee80211_local *local = sdata->local;
1450 1451 1452 1453 1454
	int res, rates, i, j;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u8 *pos;
	struct ieee80211_supported_band *sband;
1455
	union iwreq_data wrqu;
1456

1457 1458 1459 1460 1461 1462 1463
	skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
		       "response\n", sdata->dev->name);
		return -ENOMEM;
	}

1464 1465 1466
	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

	/* Remove possible STA entries from other IBSS networks. */
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1467
	sta_info_flush_delayed(sdata);
1468 1469 1470 1471 1472 1473

	if (local->ops->reset_tsf) {
		/* Reset own TSF to allow time synchronization work. */
		local->ops->reset_tsf(local_to_hw(local));
	}
	memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
1474
	res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1475 1476 1477 1478 1479 1480 1481 1482
	if (res)
		return res;

	local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;

	sdata->drop_unencrypted = bss->capability &
		WLAN_CAPABILITY_PRIVACY ? 1 : 0;

1483
	res = ieee80211_set_freq(sdata, bss->freq);
1484

1485 1486
	if (res)
		return res;
1487

1488
	/* Build IBSS probe response */
1489

1490
	skb_reserve(skb, local->hw.extra_tx_headroom);
1491

1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503
	mgmt = (struct ieee80211_mgmt *)
		skb_put(skb, 24 + sizeof(mgmt->u.beacon));
	memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						IEEE80211_STYPE_PROBE_RESP);
	memset(mgmt->da, 0xff, ETH_ALEN);
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
	memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
	mgmt->u.beacon.beacon_int =
		cpu_to_le16(local->hw.conf.beacon_int);
	mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
	mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
1504

1505 1506 1507 1508
	pos = skb_put(skb, 2 + ifsta->ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ifsta->ssid_len;
	memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1509

1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523
	rates = bss->supp_rates_len;
	if (rates > 8)
		rates = 8;
	pos = skb_put(skb, 2 + rates);
	*pos++ = WLAN_EID_SUPP_RATES;
	*pos++ = rates;
	memcpy(pos, bss->supp_rates, rates);

	if (bss->band == IEEE80211_BAND_2GHZ) {
		pos = skb_put(skb, 2 + 1);
		*pos++ = WLAN_EID_DS_PARAMS;
		*pos++ = 1;
		*pos++ = ieee80211_frequency_to_channel(bss->freq);
	}
1524

1525 1526 1527 1528 1529 1530
	pos = skb_put(skb, 2 + 2);
	*pos++ = WLAN_EID_IBSS_PARAMS;
	*pos++ = 2;
	/* FIX: set ATIM window based on scan results */
	*pos++ = 0;
	*pos++ = 0;
1531

1532 1533 1534 1535 1536 1537
	if (bss->supp_rates_len > 8) {
		rates = bss->supp_rates_len - 8;
		pos = skb_put(skb, 2 + rates);
		*pos++ = WLAN_EID_EXT_SUPP_RATES;
		*pos++ = rates;
		memcpy(pos, &bss->supp_rates[8], rates);
1538
	}
1539

1540 1541 1542 1543 1544
	ifsta->probe_resp = skb;

	ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);


1545 1546 1547 1548 1549 1550 1551
	rates = 0;
	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
	for (i = 0; i < bss->supp_rates_len; i++) {
		int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
		for (j = 0; j < sband->n_bitrates; j++)
			if (sband->bitrates[j].bitrate == bitrate)
				rates |= BIT(j);
1552
	}
1553 1554
	ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;

1555
	ieee80211_sta_def_wmm_params(sdata, bss);
1556

1557
	ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1558 1559
	mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);

1560 1561
	ieee80211_led_assoc(local, true);

1562 1563
	memset(&wrqu, 0, sizeof(wrqu));
	memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
1564
	wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1565 1566 1567 1568

	return res;
}

1569 1570 1571 1572 1573 1574 1575 1576 1577
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;
1578
	struct ieee80211_bss *bss;
1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594
	struct sta_info *sta;
	struct ieee80211_channel *channel;
	u64 beacon_timestamp, rx_timestamp;
	u64 supp_rates = 0;
	enum ieee80211_band band = rx_status->band;

	if (elems->ds_params && elems->ds_params_len == 1)
		freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
	else
		freq = rx_status->freq;

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

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

1595
	if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1596 1597 1598 1599 1600 1601 1602 1603 1604
	    memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
		supp_rates = ieee80211_sta_get_rates(local, elems, band);

		rcu_read_lock();

		sta = sta_info_get(local, mgmt->sa);
		if (sta) {
			u64 prev_rates;

J
Johannes Berg 已提交
1605
			prev_rates = sta->sta.supp_rates[band];
1606
			/* make sure mandatory rates are always added */
J
Johannes Berg 已提交
1607
			sta->sta.supp_rates[band] = supp_rates |
1608
				ieee80211_mandatory_rates(local, band);
1609 1610

#ifdef CONFIG_MAC80211_IBSS_DEBUG
J
Johannes Berg 已提交
1611
			if (sta->sta.supp_rates[band] != prev_rates)
1612
				printk(KERN_DEBUG "%s: updated supp_rates set "
1613
				    "for %pM based on beacon info (0x%llx | "
1614
				    "0x%llx -> 0x%llx)\n",
1615
				    sdata->dev->name,
1616
				    sta->sta.addr,
1617 1618
				    (unsigned long long) prev_rates,
				    (unsigned long long) supp_rates,
J
Johannes Berg 已提交
1619
				    (unsigned long long) sta->sta.supp_rates[band]);
1620 1621
#endif
		} else {
R
Rami Rosen 已提交
1622
			ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1623 1624 1625 1626 1627 1628 1629 1630 1631 1632
		}

		rcu_read_unlock();
	}

	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
					freq, beacon);
	if (!bss)
		return;

S
Sujith 已提交
1633 1634 1635 1636 1637 1638 1639
	if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
	    (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
		struct ieee80211_channel_sw_ie *sw_elem =
			(struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
		ieee80211_process_chanswitch(sdata, sw_elem, bss);
	}

1640 1641 1642
	/* was just updated in ieee80211_bss_info_update */
	beacon_timestamp = bss->timestamp;

1643 1644 1645 1646
	/*
	 * In STA mode, the remaining parameters should not be overridden
	 * by beacons because they're not necessarily accurate there.
	 */
1647
	if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1648
	    bss->last_probe_resp && beacon) {
1649
		ieee80211_rx_bss_put(local, bss);
1650 1651 1652
		return;
	}

B
Bruno Randolf 已提交
1653
	/* check if we need to merge IBSS */
1654
	if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1655
	    (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
J
Johannes Berg 已提交
1656
	    bss->capability & WLAN_CAPABILITY_IBSS &&
B
Bruno Randolf 已提交
1657
	    bss->freq == local->oper_channel->center_freq &&
1658 1659 1660
	    elems->ssid_len == sdata->u.sta.ssid_len &&
	    memcmp(elems->ssid, sdata->u.sta.ssid,
				sdata->u.sta.ssid_len) == 0) {
B
Bruno Randolf 已提交
1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676
		if (rx_status->flag & RX_FLAG_TSFT) {
			/* in order for correct IBSS merging we need mactime
			 *
			 * since mactime is defined as the time the first data
			 * symbol of the frame hits the PHY, and the timestamp
			 * of the beacon is defined as "the time that the data
			 * symbol containing the first bit of the timestamp is
			 * transmitted to the PHY plus the transmitting STA’s
			 * delays through its local PHY from the MAC-PHY
			 * interface to its interface with the WM"
			 * (802.11 11.1.2) - equals the time this bit arrives at
			 * the receiver - we have to take into account the
			 * offset between the two.
			 * e.g: at 1 MBit that means mactime is 192 usec earlier
			 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
			 */
1677 1678 1679 1680 1681
			int rate;
			if (rx_status->flag & RX_FLAG_HT) {
				rate = 65; /* TODO: HT rates */
			} else {
				rate = local->hw.wiphy->bands[band]->
B
Bruno Randolf 已提交
1682
					bitrates[rx_status->rate_idx].bitrate;
1683
			}
B
Bruno Randolf 已提交
1684 1685 1686 1687 1688 1689 1690 1691
			rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
		} else if (local && local->ops && local->ops->get_tsf)
			/* second best option: get current TSF */
			rx_timestamp = local->ops->get_tsf(local_to_hw(local));
		else
			/* can't merge without knowing the TSF */
			rx_timestamp = -1LLU;
#ifdef CONFIG_MAC80211_IBSS_DEBUG
1692 1693 1694
		printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
		       "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
		       mgmt->sa, mgmt->bssid,
B
Bruno Randolf 已提交
1695 1696 1697 1698 1699 1700
		       (unsigned long long)rx_timestamp,
		       (unsigned long long)beacon_timestamp,
		       (unsigned long long)(rx_timestamp - beacon_timestamp),
		       jiffies);
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
		if (beacon_timestamp > rx_timestamp) {
1701
#ifdef CONFIG_MAC80211_IBSS_DEBUG
1702
			printk(KERN_DEBUG "%s: beacon TSF higher than "
1703 1704
			       "local TSF - IBSS merge with BSSID %pM\n",
			       sdata->dev->name, mgmt->bssid);
J
Johannes Berg 已提交
1705
#endif
1706
			ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
R
Rami Rosen 已提交
1707
			ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
B
Bruno Randolf 已提交
1708 1709 1710
		}
	}

1711
	ieee80211_rx_bss_put(local, bss);
1712 1713 1714
}


1715
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1716 1717 1718 1719
					 struct ieee80211_mgmt *mgmt,
					 size_t len,
					 struct ieee80211_rx_status *rx_status)
{
1720 1721
	size_t baselen;
	struct ieee802_11_elems elems;
1722
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1723

1724 1725 1726
	if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
		return; /* ignore ProbeResp to foreign address */

1727 1728 1729 1730 1731 1732 1733
	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);

1734
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1735 1736 1737 1738 1739 1740 1741 1742

	/* direct probe may be part of the association flow */
	if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
							&ifsta->request)) {
		printk(KERN_DEBUG "%s direct probe responded\n",
		       sdata->dev->name);
		ieee80211_authenticate(sdata, ifsta);
	}
1743 1744 1745
}


1746
static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1747 1748 1749 1750 1751 1752 1753
				     struct ieee80211_mgmt *mgmt,
				     size_t len,
				     struct ieee80211_rx_status *rx_status)
{
	struct ieee80211_if_sta *ifsta;
	size_t baselen;
	struct ieee802_11_elems elems;
1754
	struct ieee80211_local *local = sdata->local;
1755
	u32 changed = 0;
1756
	bool erp_valid, directed_tim, is_mc = false;
J
Johannes Berg 已提交
1757
	u8 erp_value = 0;
1758

1759 1760 1761 1762 1763 1764 1765
	/* Process beacon from the current BSS */
	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

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

1766
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1767

1768
	if (sdata->vif.type != NL80211_IFTYPE_STATION)
1769 1770 1771
		return;
	ifsta = &sdata->u.sta;

1772
	if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1773 1774 1775
	    memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
		return;

S
Sujith 已提交
1776 1777 1778
	if (rx_status->freq != local->hw.conf.channel->center_freq)
		return;

1779 1780 1781
	ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
				 elems.wmm_param_len);

1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793
	if (!(local->hw.flags & IEEE80211_HW_NO_STACK_DYNAMIC_PS)) {
		directed_tim = check_tim(&elems, ifsta->aid, &is_mc);

		if (directed_tim || is_mc) {
			if (local->hw.conf.flags && IEEE80211_CONF_PS) {
				local->hw.conf.flags &= ~IEEE80211_CONF_PS;
				ieee80211_hw_config(local,
						IEEE80211_CONF_CHANGE_PS);
				ieee80211_send_nullfunc(local, sdata, 0);
			}
		}
	}
J
Johannes Berg 已提交
1794 1795 1796 1797 1798 1799

	if (elems.erp_info && elems.erp_info_len >= 1) {
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
1800
	}
J
Johannes Berg 已提交
1801 1802 1803
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
1804

1805

J
Johannes Berg 已提交
1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829
	if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
		struct sta_info *sta;
		struct ieee80211_supported_band *sband;
		u16 ap_ht_cap_flags;

		rcu_read_lock();

		sta = sta_info_get(local, ifsta->bssid);
		if (!sta) {
			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,
					       ap_ht_cap_flags);
1830 1831
	}

1832 1833 1834 1835 1836 1837 1838
	if (elems.country_elem) {
		/* Note we are only reviewing this on beacons
		 * for the BSSID we are associated to */
		regulatory_hint_11d(local->hw.wiphy,
			elems.country_elem, elems.country_elem_len);
	}

1839
	ieee80211_bss_info_change_notify(sdata, changed);
1840 1841 1842
}


1843
static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1844 1845
					struct ieee80211_if_sta *ifsta,
					struct ieee80211_mgmt *mgmt,
1846
					size_t len)
1847
{
1848
	struct ieee80211_local *local = sdata->local;
1849 1850 1851 1852 1853
	int tx_last_beacon;
	struct sk_buff *skb;
	struct ieee80211_mgmt *resp;
	u8 *pos, *end;

1854
	if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1855
	    ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1856 1857 1858 1859 1860 1861 1862 1863 1864
	    len < 24 + 2 || !ifsta->probe_resp)
		return;

	if (local->ops->tx_last_beacon)
		tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
	else
		tx_last_beacon = 1;

#ifdef CONFIG_MAC80211_IBSS_DEBUG
1865 1866 1867 1868
	printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
	       " (tx_last_beacon=%d)\n",
	       sdata->dev->name, mgmt->sa, mgmt->da,
	       mgmt->bssid, tx_last_beacon);
1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881
#endif /* CONFIG_MAC80211_IBSS_DEBUG */

	if (!tx_last_beacon)
		return;

	if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
	    memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
		return;

	end = ((u8 *) mgmt) + len;
	pos = mgmt->u.probe_req.variable;
	if (pos[0] != WLAN_EID_SSID ||
	    pos + 2 + pos[1] > end) {
1882 1883
#ifdef CONFIG_MAC80211_IBSS_DEBUG
		printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1884 1885
		       "from %pM\n",
		       sdata->dev->name, mgmt->sa);
1886
#endif
1887 1888 1889 1890 1891 1892 1893 1894 1895 1896
		return;
	}
	if (pos[1] != 0 &&
	    (pos[1] != ifsta->ssid_len ||
	     memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
		/* Ignore ProbeReq for foreign SSID */
		return;
	}

	/* Reply with ProbeResp */
1897
	skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1898 1899 1900 1901 1902 1903
	if (!skb)
		return;

	resp = (struct ieee80211_mgmt *) skb->data;
	memcpy(resp->da, mgmt->sa, ETH_ALEN);
#ifdef CONFIG_MAC80211_IBSS_DEBUG
1904 1905
	printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
	       sdata->dev->name, resp->da);
1906
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
J
Johannes Berg 已提交
1907
	ieee80211_tx_skb(sdata, skb, 0);
1908 1909
}

1910
void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1911 1912
			   struct ieee80211_rx_status *rx_status)
{
1913
	struct ieee80211_local *local = sdata->local;
1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944
	struct ieee80211_if_sta *ifsta;
	struct ieee80211_mgmt *mgmt;
	u16 fc;

	if (skb->len < 24)
		goto fail;

	ifsta = &sdata->u.sta;

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

	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_PROBE_REQ:
	case IEEE80211_STYPE_PROBE_RESP:
	case IEEE80211_STYPE_BEACON:
		memcpy(skb->cb, rx_status, sizeof(*rx_status));
	case IEEE80211_STYPE_AUTH:
	case IEEE80211_STYPE_ASSOC_RESP:
	case IEEE80211_STYPE_REASSOC_RESP:
	case IEEE80211_STYPE_DEAUTH:
	case IEEE80211_STYPE_DISASSOC:
		skb_queue_tail(&ifsta->skb_queue, skb);
		queue_work(local->hw.workqueue, &ifsta->work);
		return;
	}

 fail:
	kfree_skb(skb);
}

1945
static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960
					 struct sk_buff *skb)
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_if_sta *ifsta;
	struct ieee80211_mgmt *mgmt;
	u16 fc;

	ifsta = &sdata->u.sta;

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

	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_PROBE_REQ:
1961
		ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
1962 1963
		break;
	case IEEE80211_STYPE_PROBE_RESP:
1964
		ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
1965 1966
		break;
	case IEEE80211_STYPE_BEACON:
1967
		ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
1968 1969
		break;
	case IEEE80211_STYPE_AUTH:
1970
		ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
1971 1972
		break;
	case IEEE80211_STYPE_ASSOC_RESP:
1973
		ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
1974 1975
		break;
	case IEEE80211_STYPE_REASSOC_RESP:
1976
		ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
1977 1978
		break;
	case IEEE80211_STYPE_DEAUTH:
1979
		ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
1980 1981
		break;
	case IEEE80211_STYPE_DISASSOC:
1982
		ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
1983 1984 1985 1986 1987 1988 1989
		break;
	}

	kfree_skb(skb);
}


1990
static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
1991
{
1992
	struct ieee80211_local *local = sdata->local;
1993 1994 1995
	int active = 0;
	struct sta_info *sta;

1996 1997 1998 1999
	rcu_read_lock();

	list_for_each_entry_rcu(sta, &local->sta_list, list) {
		if (sta->sdata == sdata &&
2000 2001 2002 2003 2004 2005
		    time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
			       jiffies)) {
			active++;
			break;
		}
	}
2006 2007

	rcu_read_unlock();
2008 2009 2010 2011 2012

	return active;
}


2013
static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2014 2015 2016 2017
				     struct ieee80211_if_sta *ifsta)
{
	mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);

2018 2019
	ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
	if (ieee80211_sta_active_ibss(sdata))
2020 2021
		return;

2022 2023 2024 2025
	if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
	    (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
		return;

2026
	printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2027
	       "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2028
	ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
2029 2030 2031
}


J
Johannes Berg 已提交
2032
static void ieee80211_sta_timer(unsigned long data)
2033
{
J
Johannes Berg 已提交
2034 2035 2036 2037
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
	struct ieee80211_local *local = sdata->local;
2038

J
Johannes Berg 已提交
2039 2040
	set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
	queue_work(local->hw.workqueue, &ifsta->work);
2041 2042
}

2043
static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2044 2045
				     struct ieee80211_if_sta *ifsta)
{
2046
	struct ieee80211_local *local = sdata->local;
2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064

	if (local->ops->reset_tsf) {
		/* Reset own TSF to allow time synchronization work. */
		local->ops->reset_tsf(local_to_hw(local));
	}

	ifsta->wmm_last_param_set = -1; /* allow any WMM update */


	if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
		ifsta->auth_alg = WLAN_AUTH_OPEN;
	else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
		ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
	else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
		ifsta->auth_alg = WLAN_AUTH_LEAP;
	else
		ifsta->auth_alg = WLAN_AUTH_OPEN;
	ifsta->auth_transaction = -1;
2065
	ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2066
	ifsta->assoc_scan_tries = 0;
2067
	ifsta->direct_probe_tries = 0;
2068 2069
	ifsta->auth_tries = 0;
	ifsta->assoc_tries = 0;
2070
	netif_tx_stop_all_queues(sdata->dev);
2071
	netif_carrier_off(sdata->dev);
2072 2073 2074 2075 2076 2077 2078 2079
}


static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
				    const char *ssid, int ssid_len)
{
	int tmp, hidden_ssid;

2080 2081
	if (ssid_len == ifsta->ssid_len &&
	    !memcmp(ifsta->ssid, ssid, ssid_len))
2082 2083
		return 1;

2084
	if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095
		return 0;

	hidden_ssid = 1;
	tmp = ssid_len;
	while (tmp--) {
		if (ssid[tmp] != '\0') {
			hidden_ssid = 0;
			break;
		}
	}

2096
	if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
2097 2098 2099 2100 2101 2102 2103 2104
		return 1;

	if (ssid_len == 1 && ssid[0] == ' ')
		return 1;

	return 0;
}

2105
static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2106 2107
				     struct ieee80211_if_sta *ifsta)
{
2108
	struct ieee80211_local *local = sdata->local;
2109
	struct ieee80211_bss *bss;
2110
	struct ieee80211_supported_band *sband;
2111 2112
	u8 bssid[ETH_ALEN], *pos;
	int i;
2113
	int ret;
2114 2115 2116 2117 2118 2119 2120 2121 2122 2123

#if 0
	/* Easier testing, use fixed BSSID. */
	memset(bssid, 0xfe, ETH_ALEN);
#else
	/* Generate random, not broadcast, locally administered BSSID. Mix in
	 * own MAC address to make sure that devices that do not have proper
	 * random number generator get different BSSID. */
	get_random_bytes(bssid, ETH_ALEN);
	for (i = 0; i < ETH_ALEN; i++)
2124
		bssid[i] ^= sdata->dev->dev_addr[i];
2125 2126 2127 2128
	bssid[0] &= ~0x01;
	bssid[0] |= 0x02;
#endif

2129 2130
	printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
	       sdata->dev->name, bssid);
2131

2132
	bss = ieee80211_rx_bss_add(local, bssid,
2133
				   local->hw.conf.channel->center_freq,
2134
				   sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2135 2136 2137
	if (!bss)
		return -ENOMEM;

2138 2139
	bss->band = local->hw.conf.channel->band;
	sband = local->hw.wiphy->bands[bss->band];
2140 2141

	if (local->hw.conf.beacon_int == 0)
2142
		local->hw.conf.beacon_int = 100;
2143 2144 2145
	bss->beacon_int = local->hw.conf.beacon_int;
	bss->last_update = jiffies;
	bss->capability = WLAN_CAPABILITY_IBSS;
J
Johannes Berg 已提交
2146 2147

	if (sdata->default_key)
2148
		bss->capability |= WLAN_CAPABILITY_PRIVACY;
J
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2149
	else
2150
		sdata->drop_unencrypted = 0;
J
Johannes Berg 已提交
2151

2152
	bss->supp_rates_len = sband->n_bitrates;
2153
	pos = bss->supp_rates;
2154 2155
	for (i = 0; i < sband->n_bitrates; i++) {
		int rate = sband->bitrates[i].bitrate;
2156 2157 2158
		*pos++ = (u8) (rate / 5);
	}

2159
	ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2160
	ieee80211_rx_bss_put(local, bss);
2161
	return ret;
2162 2163 2164
}


2165
static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2166 2167
				   struct ieee80211_if_sta *ifsta)
{
2168
	struct ieee80211_local *local = sdata->local;
2169
	struct ieee80211_bss *bss;
2170 2171 2172 2173 2174 2175 2176
	int found = 0;
	u8 bssid[ETH_ALEN];
	int active_ibss;

	if (ifsta->ssid_len == 0)
		return -EINVAL;

2177
	active_ibss = ieee80211_sta_active_ibss(sdata);
2178 2179
#ifdef CONFIG_MAC80211_IBSS_DEBUG
	printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2180
	       sdata->dev->name, active_ibss);
2181
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
2182 2183
	spin_lock_bh(&local->bss_lock);
	list_for_each_entry(bss, &local->bss_list, list) {
2184 2185 2186 2187 2188
		if (ifsta->ssid_len != bss->ssid_len ||
		    memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
		    || !(bss->capability & WLAN_CAPABILITY_IBSS))
			continue;
#ifdef CONFIG_MAC80211_IBSS_DEBUG
2189
		printk(KERN_DEBUG "   bssid=%pM found\n", bss->bssid);
2190 2191 2192 2193 2194 2195
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
		memcpy(bssid, bss->bssid, ETH_ALEN);
		found = 1;
		if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
			break;
	}
2196
	spin_unlock_bh(&local->bss_lock);
2197 2198

#ifdef CONFIG_MAC80211_IBSS_DEBUG
2199
	if (found)
2200 2201
		printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
		       "%pM\n", bssid, ifsta->bssid);
2202
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
2203 2204

	if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2205
		int ret;
2206 2207 2208 2209 2210 2211 2212
		int search_freq;

		if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
			search_freq = bss->freq;
		else
			search_freq = local->hw.conf.channel->center_freq;

2213
		bss = ieee80211_rx_bss_get(local, bssid, search_freq,
2214 2215 2216 2217
					   ifsta->ssid, ifsta->ssid_len);
		if (!bss)
			goto dont_join;

2218
		printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2219
		       " based on configured SSID\n",
2220
		       sdata->dev->name, bssid);
2221
		ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2222
		ieee80211_rx_bss_put(local, bss);
2223
		return ret;
2224
	}
2225 2226

dont_join:
2227 2228 2229 2230 2231
#ifdef CONFIG_MAC80211_IBSS_DEBUG
	printk(KERN_DEBUG "   did not try to join ibss\n");
#endif /* CONFIG_MAC80211_IBSS_DEBUG */

	/* Selected IBSS not found in current scan results - try to scan */
2232
	if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2233
	    !ieee80211_sta_active_ibss(sdata)) {
2234 2235 2236 2237 2238
		mod_timer(&ifsta->timer, jiffies +
				      IEEE80211_IBSS_MERGE_INTERVAL);
	} else if (time_after(jiffies, local->last_scan_completed +
			      IEEE80211_SCAN_INTERVAL)) {
		printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2239
		       "join\n", sdata->dev->name);
2240
		return ieee80211_request_scan(sdata, ifsta->ssid,
2241
					      ifsta->ssid_len);
2242
	} else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2243 2244 2245 2246
		int interval = IEEE80211_SCAN_INTERVAL;

		if (time_after(jiffies, ifsta->ibss_join_req +
			       IEEE80211_IBSS_JOIN_TIMEOUT)) {
2247
			if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2248 2249
			    (!(local->oper_channel->flags &
					IEEE80211_CHAN_NO_IBSS)))
2250
				return ieee80211_sta_create_ibss(sdata, ifsta);
2251
			if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2252
				printk(KERN_DEBUG "%s: IBSS not allowed on"
2253
				       " %d MHz\n", sdata->dev->name,
2254
				       local->hw.conf.channel->center_freq);
2255 2256 2257 2258 2259 2260 2261
			}

			/* No IBSS found - decrease scan interval and continue
			 * scanning. */
			interval = IEEE80211_SCAN_INTERVAL_SLOW;
		}

2262
		ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2263 2264 2265 2266 2267 2268 2269 2270
		mod_timer(&ifsta->timer, jiffies + interval);
		return 0;
	}

	return 0;
}


J
Johannes Berg 已提交
2271 2272
static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_if_sta *ifsta)
2273
{
J
Johannes Berg 已提交
2274
	struct ieee80211_local *local = sdata->local;
2275
	struct ieee80211_bss *bss, *selected = NULL;
J
Johannes Berg 已提交
2276
	int top_rssi = 0, freq;
2277

2278
	spin_lock_bh(&local->bss_lock);
J
Johannes Berg 已提交
2279
	freq = local->oper_channel->center_freq;
2280
	list_for_each_entry(bss, &local->bss_list, list) {
J
Johannes Berg 已提交
2281 2282
		if (!(bss->capability & WLAN_CAPABILITY_ESS))
			continue;
2283

J
Johannes Berg 已提交
2284 2285 2286 2287 2288 2289
		if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
			IEEE80211_STA_AUTO_BSSID_SEL |
			IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
		    (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
		     !!sdata->default_key))
			continue;
2290

J
Johannes Berg 已提交
2291 2292 2293
		if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
		    bss->freq != freq)
			continue;
2294

J
Johannes Berg 已提交
2295 2296 2297
		if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
		    memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
			continue;
2298

J
Johannes Berg 已提交
2299 2300 2301
		if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
		    !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
			continue;
2302

J
Johannes Berg 已提交
2303 2304 2305 2306
		if (!selected || top_rssi < bss->signal) {
			selected = bss;
			top_rssi = bss->signal;
		}
2307
	}
J
Johannes Berg 已提交
2308 2309
	if (selected)
		atomic_inc(&selected->users);
2310
	spin_unlock_bh(&local->bss_lock);
2311

J
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2312 2313 2314 2315 2316 2317 2318
	if (selected) {
		ieee80211_set_freq(sdata, selected->freq);
		if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
			ieee80211_sta_set_ssid(sdata, selected->ssid,
					       selected->ssid_len);
		ieee80211_sta_set_bssid(sdata, selected->bssid);
		ieee80211_sta_def_wmm_params(sdata, selected);
2319

J
Johannes Berg 已提交
2320 2321 2322 2323 2324 2325 2326 2327 2328
		/* Send out direct probe if no probe resp was received or
		 * the one we have is outdated
		 */
		if (!selected->last_probe_resp ||
		    time_after(jiffies, selected->last_probe_resp
					+ IEEE80211_SCAN_RESULT_EXPIRE))
			ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
		else
			ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2329

J
Johannes Berg 已提交
2330 2331 2332 2333 2334 2335 2336
		ieee80211_rx_bss_put(local, selected);
		ieee80211_sta_reset_auth(sdata, ifsta);
		return 0;
	} else {
		if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
			ifsta->assoc_scan_tries++;
			if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2337
				ieee80211_start_scan(sdata, NULL, 0);
J
Johannes Berg 已提交
2338
			else
2339
				ieee80211_start_scan(sdata, ifsta->ssid,
J
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2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360
							 ifsta->ssid_len);
			ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
			set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
		} else
			ifsta->state = IEEE80211_STA_MLME_DISABLED;
	}
	return -1;
}


static void ieee80211_sta_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data, u.sta.work);
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_sta *ifsta;
	struct sk_buff *skb;

	if (!netif_running(sdata->dev))
		return;

2361
	if (local->sw_scanning || local->hw_scanning)
J
Johannes Berg 已提交
2362 2363
		return;

2364 2365
	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
		    sdata->vif.type != NL80211_IFTYPE_ADHOC))
J
Johannes Berg 已提交
2366
		return;
2367 2368
	ifsta = &sdata->u.sta;

J
Johannes Berg 已提交
2369 2370 2371 2372 2373 2374 2375
	while ((skb = skb_dequeue(&ifsta->skb_queue)))
		ieee80211_sta_rx_queued_mgmt(sdata, skb);

	if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
	    ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
	    ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
	    test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2376 2377
		ieee80211_start_scan(sdata, ifsta->scan_ssid,
				     ifsta->scan_ssid_len);
J
Johannes Berg 已提交
2378
		return;
2379 2380
	}

J
Johannes Berg 已提交
2381 2382 2383 2384 2385 2386
	if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
		if (ieee80211_sta_config_auth(sdata, ifsta))
			return;
		clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
	} else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
		return;
2387

J
Johannes Berg 已提交
2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420
	switch (ifsta->state) {
	case IEEE80211_STA_MLME_DISABLED:
		break;
	case IEEE80211_STA_MLME_DIRECT_PROBE:
		ieee80211_direct_probe(sdata, ifsta);
		break;
	case IEEE80211_STA_MLME_AUTHENTICATE:
		ieee80211_authenticate(sdata, ifsta);
		break;
	case IEEE80211_STA_MLME_ASSOCIATE:
		ieee80211_associate(sdata, ifsta);
		break;
	case IEEE80211_STA_MLME_ASSOCIATED:
		ieee80211_associated(sdata, ifsta);
		break;
	case IEEE80211_STA_MLME_IBSS_SEARCH:
		ieee80211_sta_find_ibss(sdata, ifsta);
		break;
	case IEEE80211_STA_MLME_IBSS_JOINED:
		ieee80211_sta_merge_ibss(sdata, ifsta);
		break;
	default:
		WARN_ON(1);
		break;
	}

	if (ieee80211_privacy_mismatch(sdata, ifsta)) {
		printk(KERN_DEBUG "%s: privacy configuration mismatch and "
		       "mixed-cell disabled - disassociate\n", sdata->dev->name);

		ieee80211_set_disassoc(sdata, ifsta, false, true,
					WLAN_REASON_UNSPECIFIED);
	}
2421 2422
}

J
Johannes Berg 已提交
2423 2424
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
2425
	if (sdata->vif.type == NL80211_IFTYPE_STATION)
J
Johannes Berg 已提交
2426 2427 2428
		queue_work(sdata->local->hw.workqueue,
			   &sdata->u.sta.work);
}
2429

J
Johannes Berg 已提交
2430 2431
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2432
{
J
Johannes Berg 已提交
2433
	struct ieee80211_if_sta *ifsta;
J
Johannes Berg 已提交
2434

J
Johannes Berg 已提交
2435 2436
	ifsta = &sdata->u.sta;
	INIT_WORK(&ifsta->work, ieee80211_sta_work);
S
Sujith 已提交
2437
	INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
J
Johannes Berg 已提交
2438
	setup_timer(&ifsta->timer, ieee80211_sta_timer,
S
Sujith 已提交
2439 2440
		    (unsigned long) sdata);
	setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
J
Johannes Berg 已提交
2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451
		    (unsigned long) sdata);
	skb_queue_head_init(&ifsta->skb_queue);

	ifsta->capab = WLAN_CAPABILITY_ESS;
	ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
		IEEE80211_AUTH_ALG_SHARED_KEY;
	ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
		IEEE80211_STA_AUTO_BSSID_SEL |
		IEEE80211_STA_AUTO_CHANNEL_SEL;
	if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
		ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2452 2453
}

J
Johannes Berg 已提交
2454 2455 2456 2457 2458
/*
 * Add a new IBSS station, will also be called by the RX code when,
 * in IBSS mode, receiving a frame from a yet-unknown station, hence
 * must be callable in atomic context.
 */
2459
struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
R
Rami Rosen 已提交
2460
					u8 *bssid,u8 *addr, u64 supp_rates)
2461
{
2462
	struct ieee80211_local *local = sdata->local;
2463
	struct sta_info *sta;
2464
	int band = local->hw.conf.channel->band;
2465 2466 2467 2468 2469 2470

	/* TODO: Could consider removing the least recently used entry and
	 * allow new one to be added. */
	if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2471
			       "entry %pM\n", sdata->dev->name, addr);
2472 2473 2474 2475
		}
		return NULL;
	}

2476
	if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2477 2478
		return NULL;

2479
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2480 2481
	printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
	       wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2482
#endif
2483

J
Johannes Berg 已提交
2484 2485
	sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
	if (!sta)
2486 2487
		return NULL;

2488
	set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2489

2490
	/* make sure mandatory rates are always added */
J
Johannes Berg 已提交
2491
	sta->sta.supp_rates[band] = supp_rates |
2492
			ieee80211_mandatory_rates(local, band);
2493

2494
	rate_control_rate_init(sta);
2495

2496
	if (sta_info_insert(sta))
J
Johannes Berg 已提交
2497 2498
		return NULL;

2499
	return sta;
2500 2501
}

J
Johannes Berg 已提交
2502 2503 2504
/* configuration hooks */
void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
			    struct ieee80211_if_sta *ifsta)
J
Johannes Berg 已提交
2505 2506 2507
{
	struct ieee80211_local *local = sdata->local;

2508
	if (sdata->vif.type != NL80211_IFTYPE_STATION)
J
Johannes Berg 已提交
2509
		return;
J
Johannes Berg 已提交
2510

J
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2511 2512 2513 2514
	if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
			     IEEE80211_STA_AUTO_BSSID_SEL)) &&
	    (ifsta->flags & (IEEE80211_STA_SSID_SET |
			     IEEE80211_STA_AUTO_SSID_SEL))) {
J
Johannes Berg 已提交
2515

J
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2516 2517 2518
		if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
			ieee80211_set_disassoc(sdata, ifsta, true, true,
					       WLAN_REASON_DEAUTH_LEAVING);
J
Johannes Berg 已提交
2519

J
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2520 2521 2522 2523
		set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
		queue_work(local->hw.workqueue, &ifsta->work);
	}
}
J
Johannes Berg 已提交
2524

J
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2525 2526 2527
int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
{
	struct ieee80211_if_sta *ifsta;
J
Johannes Berg 已提交
2528

J
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2529 2530 2531 2532 2533 2534 2535 2536 2537 2538
	if (len > IEEE80211_MAX_SSID_LEN)
		return -EINVAL;

	ifsta = &sdata->u.sta;

	if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
		memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
		memcpy(ifsta->ssid, ssid, len);
		ifsta->ssid_len = len;
		ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
J
Johannes Berg 已提交
2539 2540
	}

J
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2541 2542 2543 2544
	if (len)
		ifsta->flags |= IEEE80211_STA_SSID_SET;
	else
		ifsta->flags &= ~IEEE80211_STA_SSID_SET;
J
Johannes Berg 已提交
2545

2546
	if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
J
Johannes Berg 已提交
2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567
	    !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
		ifsta->ibss_join_req = jiffies;
		ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
		return ieee80211_sta_find_ibss(sdata, ifsta);
	}

	return 0;
}

int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
{
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
	memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
	*len = ifsta->ssid_len;
	return 0;
}

int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
{
	struct ieee80211_if_sta *ifsta;
	int res;
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	bool valid;
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	ifsta = &sdata->u.sta;
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	valid = is_valid_ether_addr(bssid);
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	if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
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		if(valid)
			memcpy(ifsta->bssid, bssid, ETH_ALEN);
		else
			memset(ifsta->bssid, 0, ETH_ALEN);
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		res = 0;
		/*
		 * Hack! See also ieee80211_sta_set_ssid.
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		 */
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		if (netif_running(sdata->dev))
			res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
		if (res) {
			printk(KERN_DEBUG "%s: Failed to config new BSSID to "
			       "the low-level driver\n", sdata->dev->name);
			return res;
		}
	}
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	if (valid)
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		ifsta->flags |= IEEE80211_STA_BSSID_SET;
	else
		ifsta->flags &= ~IEEE80211_STA_BSSID_SET;

	return 0;
}

int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
{
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;

	kfree(ifsta->extra_ie);
	if (len == 0) {
		ifsta->extra_ie = NULL;
		ifsta->extra_ie_len = 0;
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		return 0;
	}
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	ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
	if (!ifsta->extra_ie) {
		ifsta->extra_ie_len = 0;
		return -ENOMEM;
	}
	memcpy(ifsta->extra_ie, ie, len);
	ifsta->extra_ie_len = len;
	return 0;
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}

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int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
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{
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;

2623
	printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2624
	       sdata->dev->name, reason);
2625

2626 2627
	if (sdata->vif.type != NL80211_IFTYPE_STATION &&
	    sdata->vif.type != NL80211_IFTYPE_ADHOC)
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		return -EINVAL;

2630
	ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
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	return 0;
}

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int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
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{
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;

2638
	printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2639
	       sdata->dev->name, reason);
2640

2641
	if (sdata->vif.type != NL80211_IFTYPE_STATION)
2642 2643
		return -EINVAL;

2644
	if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
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		return -1;

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	ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
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	return 0;
}
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/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
{
	struct ieee80211_sub_if_data *sdata = local->scan_sdata;
	struct ieee80211_if_sta *ifsta;

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	if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
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		ifsta = &sdata->u.sta;
		if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
		    (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
		    !ieee80211_sta_active_ibss(sdata)))
			ieee80211_sta_find_ibss(sdata, ifsta);
	}

	/* 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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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);
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	struct ieee80211_sub_if_data *sdata = local->scan_sdata;
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	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

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	ieee80211_send_nullfunc(local, sdata, 1);
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	local->hw.conf.flags |= IEEE80211_CONF_PS;

	ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
}

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

	queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
}