mlme.c 70.1 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);
		mgmt->u.reassoc_req.listen_interval =
				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 */
	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)) &&
	    ht_ie[1] >= sizeof(struct ieee80211_ht_info)) {
		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)
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				local->wmm_acm |= BIT(0) | BIT(3);
			break;
		case 2:
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			queue = 1;
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			if (acm)
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				local->wmm_acm |= BIT(4) | BIT(5);
			break;
		case 3:
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			queue = 0;
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			if (acm)
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				local->wmm_acm |= BIT(6) | BIT(7);
			break;
		case 0:
		default:
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			queue = 2;
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			if (acm)
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				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);
555
		params.txop = get_unaligned_le16(pos + 2);
556
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
557
		printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
558
		       "cWmin=%d cWmax=%d txop=%d\n",
559
		       local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
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		       params.cw_max, params.txop);
#endif
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		/* 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 "
566
			       "parameters for queue %d\n", local->mdev->name, queue);
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		}
	}
}

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static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
573
{
574
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
575
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
576
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
577
#endif
578
	u32 changed = 0;
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	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);
592

593
	if (use_protection != bss_conf->use_cts_prot) {
594
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
595
		if (net_ratelimit()) {
596
			printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
597
			       sdata->dev->name,
598
			       use_protection ? "enabled" : "disabled",
599
			       ifsta->bssid);
600
		}
601
#endif
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		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
604
	}
605

606
	if (use_short_preamble != bss_conf->use_short_preamble) {
607
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
608 609
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: switched to %s barker preamble"
610
			       " (BSSID=%pM)\n",
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			       sdata->dev->name,
612
			       use_short_preamble ? "short" : "long",
613
			       ifsta->bssid);
614
		}
615
#endif
616
		bss_conf->use_short_preamble = use_short_preamble;
617
		changed |= BSS_CHANGED_ERP_PREAMBLE;
618
	}
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	if (use_short_slot != bss_conf->use_short_slot) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: switched to %s slot"
			       " (BSSID=%s)\n",
			       sdata->dev->name,
			       use_short_slot ? "short" : "long",
			       ifsta->bssid);
		}
#endif
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
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	}

	return changed;
}

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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);
}

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static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
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					 struct ieee80211_if_sta *ifsta)
{
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	char *buf;
	size_t len;
	int i;
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	union iwreq_data wrqu;

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	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(");
665
	if (ifsta->assocreq_ies) {
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		len += sprintf(buf + len, "ReqIEs=");
		for (i = 0; i < ifsta->assocreq_ies_len; i++) {
			len += sprintf(buf + len, "%02x",
				       ifsta->assocreq_ies[i]);
		}
671
	}
672
	if (ifsta->assocresp_ies) {
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		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]);
		}
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	}
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	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]);
		}
	}

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	if (len <= IW_CUSTOM_MAX) {
		memset(&wrqu, 0, sizeof(wrqu));
		wrqu.data.length = len;
		wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
	}
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	kfree(buf);
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}


701
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
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				     struct ieee80211_if_sta *ifsta,
				     u32 bss_info_changed)
704
{
705
	struct ieee80211_local *local = sdata->local;
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	struct ieee80211_conf *conf = &local_to_hw(local)->conf;
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708
	struct ieee80211_bss *bss;
709

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	bss_info_changed |= BSS_CHANGED_ASSOC;
711
	ifsta->flags |= IEEE80211_STA_ASSOCIATED;
712

713
	if (sdata->vif.type != NL80211_IFTYPE_STATION)
714
		return;
715

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	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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		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;
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		bss_info_changed |= ieee80211_handle_bss_capability(sdata,
726
			bss->capability, bss->has_erp_value, bss->erp_value);
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		ieee80211_rx_bss_put(local, bss);
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	}

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	ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
	memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
	ieee80211_sta_send_associnfo(sdata, ifsta);
734

735 736
	ifsta->last_probe = jiffies;
	ieee80211_led_assoc(local, 1);
737

738
	sdata->vif.bss_conf.assoc = 1;
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	/*
	 * 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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	bss_info_changed |= BSS_CHANGED_BASIC_RATES;
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
746

747 748
	netif_tx_start_all_queues(sdata->dev);
	netif_carrier_on(sdata->dev);
749

750
	ieee80211_sta_send_apinfo(sdata, ifsta);
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}

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static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_if_sta *ifsta)
755
{
756 757
	ifsta->direct_probe_tries++;
	if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
758 759
		printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
		       sdata->dev->name, ifsta->bssid);
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		ifsta->state = IEEE80211_STA_MLME_DISABLED;
761
		ieee80211_sta_send_apinfo(sdata, ifsta);
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		return;
	}

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	printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
			sdata->dev->name, ifsta->bssid,
767
			ifsta->direct_probe_tries);
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	ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
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	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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}
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static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_if_sta *ifsta)
785
{
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	ifsta->auth_tries++;
	if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
788
		printk(KERN_DEBUG "%s: authentication with AP %pM"
789
		       " timed out\n",
790
		       sdata->dev->name, ifsta->bssid);
791
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
792
		ieee80211_sta_send_apinfo(sdata, ifsta);
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		return;
	}

796
	ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
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	printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
	       sdata->dev->name, ifsta->bssid);
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	ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);

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

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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;
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	u32 changed = 0;
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	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;

828
	netif_tx_stop_all_queues(sdata->dev);
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	netif_carrier_off(sdata->dev);

831
	ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
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	if (self_disconnected) {
		if (deauth)
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			ieee80211_send_deauth_disassoc(sdata,
				IEEE80211_STYPE_DEAUTH, reason);
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		else
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			ieee80211_send_deauth_disassoc(sdata,
				IEEE80211_STYPE_DISASSOC, reason);
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	}

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	ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
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	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
848 849

	ieee80211_sta_send_apinfo(sdata, ifsta);
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	if (self_disconnected)
		ifsta->state = IEEE80211_STA_MLME_DISABLED;

	sta_info_unlink(&sta);

	rcu_read_unlock();

	sta_info_destroy(sta);
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	local->hw.conf.ht.enabled = false;
	ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_HT);

	ieee80211_bss_info_change_notify(sdata, changed);
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}
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866 867 868 869 870 871 872 873
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;
}

874
static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
875 876
				      struct ieee80211_if_sta *ifsta)
{
877
	struct ieee80211_local *local = sdata->local;
878
	struct ieee80211_bss *bss;
879 880 881
	int bss_privacy;
	int wep_privacy;
	int privacy_invoked;
882

883
	if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
884 885
		return 0;

886
	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
887
				   local->hw.conf.channel->center_freq,
888
				   ifsta->ssid, ifsta->ssid_len);
889 890 891
	if (!bss)
		return 0;

892
	bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
893
	wep_privacy = !!ieee80211_sta_wep_configured(sdata);
894
	privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
895

896
	ieee80211_rx_bss_put(local, bss);
897

898 899 900 901
	if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
		return 0;

	return 1;
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}

904
static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
905 906 907 908
				struct ieee80211_if_sta *ifsta)
{
	ifsta->assoc_tries++;
	if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
909
		printk(KERN_DEBUG "%s: association with AP %pM"
910
		       " timed out\n",
911
		       sdata->dev->name, ifsta->bssid);
912
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
913
		ieee80211_sta_send_apinfo(sdata, ifsta);
914 915 916
		return;
	}

917
	ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
918 919
	printk(KERN_DEBUG "%s: associate with AP %pM\n",
	       sdata->dev->name, ifsta->bssid);
920
	if (ieee80211_privacy_mismatch(sdata, ifsta)) {
921
		printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
922
		       "mixed-cell disabled - abort association\n", sdata->dev->name);
923
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
924 925 926
		return;
	}

927
	ieee80211_send_assoc(sdata, ifsta);
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	mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
}


933
static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
934 935
				 struct ieee80211_if_sta *ifsta)
{
936
	struct ieee80211_local *local = sdata->local;
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	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 */

945
	ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
946

947 948
	rcu_read_lock();

949 950
	sta = sta_info_get(local, ifsta->bssid);
	if (!sta) {
951 952
		printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
		       sdata->dev->name, ifsta->bssid);
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		disassoc = 1;
	} else {
		disassoc = 0;
		if (time_after(jiffies,
			       sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
958
			if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
959
				printk(KERN_DEBUG "%s: No ProbeResp from "
960
				       "current AP %pM - assume out of "
961
				       "range\n",
962
				       sdata->dev->name, ifsta->bssid);
963
				disassoc = 1;
964
			} else
965
				ieee80211_send_probe_req(sdata, ifsta->bssid,
966 967
							 ifsta->ssid,
							 ifsta->ssid_len);
968
			ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
969
		} else {
970
			ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
971 972 973
			if (time_after(jiffies, ifsta->last_probe +
				       IEEE80211_PROBE_INTERVAL)) {
				ifsta->last_probe = jiffies;
974
				ieee80211_send_probe_req(sdata, ifsta->bssid,
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							 ifsta->ssid,
							 ifsta->ssid_len);
			}
		}
	}
980 981 982

	rcu_read_unlock();

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	if (disassoc)
		ieee80211_set_disassoc(sdata, ifsta, true, true,
					WLAN_REASON_PREV_AUTH_NOT_VALID);
	else
		mod_timer(&ifsta->timer, jiffies +
				      IEEE80211_MONITORING_INTERVAL);
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}


992
static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
993 994
				     struct ieee80211_if_sta *ifsta)
{
995
	printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
996
	ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
997
	ieee80211_associate(sdata, ifsta);
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}


1001
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1002 1003 1004 1005 1006 1007 1008 1009
				     struct ieee80211_if_sta *ifsta,
				     struct ieee80211_mgmt *mgmt,
				     size_t len)
{
	u8 *pos;
	struct ieee802_11_elems elems;

	pos = mgmt->u.auth.variable;
1010
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1011
	if (!elems.challenge)
1012
		return;
1013
	ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1014 1015 1016
			    elems.challenge_len + 2, 1);
}

1017
static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1018 1019 1020 1021 1022 1023
				   struct ieee80211_if_sta *ifsta,
				   struct ieee80211_mgmt *mgmt,
				   size_t len)
{
	u16 auth_alg, auth_transaction, status_code;

1024
	if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1025
	    sdata->vif.type != NL80211_IFTYPE_ADHOC)
1026 1027
		return;

1028
	if (len < 24 + 6)
1029 1030
		return;

1031
	if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1032
	    memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1033 1034
		return;

1035
	if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1036
	    memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1037 1038 1039 1040 1041 1042
		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);

1043
	if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1044 1045
		/*
		 * IEEE 802.11 standard does not require authentication in IBSS
1046 1047 1048
		 * networks and most implementations do not seem to use it.
		 * However, try to reply to authentication attempts if someone
		 * has actually implemented this.
1049
		 */
1050
		if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1051
			return;
1052
		ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1053 1054 1055
	}

	if (auth_alg != ifsta->auth_alg ||
1056
	    auth_transaction != ifsta->auth_transaction)
1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
		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 &&
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				    !ieee80211_sta_wep_configured(sdata))
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					continue;
				ifsta->auth_alg = algs[pos];
				break;
			}
		}
		return;
	}

	switch (ifsta->auth_alg) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
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		ieee80211_auth_completed(sdata, ifsta);
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		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifsta->auth_transaction == 4)
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			ieee80211_auth_completed(sdata, ifsta);
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		else
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			ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
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		break;
	}
}


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static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
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				     struct ieee80211_if_sta *ifsta,
				     struct ieee80211_mgmt *mgmt,
				     size_t len)
{
	u16 reason_code;

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	if (len < 24 + 2)
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		return;

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	if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
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		return;

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

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Johannes Berg committed
1124
	if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
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		printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
				sdata->dev->name, reason_code);