mlme.c 120 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.
 */

/* TODO:
 * order BSS list by RSSI(?) ("quality of AP")
 * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
 *    SSID)
 */
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#include <linux/delay.h>
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#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/netdevice.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 <asm/types.h>

#include <net/mac80211.h>
#include "ieee80211_i.h"
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#include "rate.h"
#include "led.h"
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#include "mesh.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)
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#define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
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#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_PROBE_DELAY (HZ / 33)
#define IEEE80211_CHANNEL_TIME (HZ / 33)
#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
#define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
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#define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
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#define IEEE80211_IBSS_MAX_STA_ENTRIES 128


#define ERP_INFO_USE_PROTECTION BIT(1)

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/* mgmt header + 1 byte category code */
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#define IEEE80211_MIN_ACTION_SIZE (24 + 1)

#define IEEE80211_ADDBA_PARAM_POLICY_MASK 0x0002
#define IEEE80211_ADDBA_PARAM_TID_MASK 0x003C
#define IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK 0xFFA0
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#define IEEE80211_DELBA_PARAM_TID_MASK 0xF000
#define IEEE80211_DELBA_PARAM_INITIATOR_MASK 0x0800
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/* next values represent the buffer size for A-MPDU frame.
 * According to IEEE802.11n spec size varies from 8K to 64K (in powers of 2) */
#define IEEE80211_MIN_AMPDU_BUF 0x8
#define IEEE80211_MAX_AMPDU_BUF 0x40

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static void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
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				     u8 *ssid, size_t ssid_len);
static struct ieee80211_sta_bss *
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ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
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		     u8 *ssid, u8 ssid_len);
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static void ieee80211_rx_bss_put(struct ieee80211_local *local,
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				 struct ieee80211_sta_bss *bss);
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static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
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				   struct ieee80211_if_sta *ifsta);
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static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata);
static int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *sdata,
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				    u8 *ssid, size_t ssid_len);
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static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
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				     struct ieee80211_if_sta *ifsta);
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static void sta_rx_agg_session_timer_expired(unsigned long data);
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static u8 * ieee80211_bss_get_ie(struct ieee80211_sta_bss *bss, u8 ie)
{
	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 ecw2cw(int ecw)
{
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	return (1 << ecw) - 1;
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}

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static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
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					 struct ieee80211_sta_bss *bss,
					 int ibss)
{
	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;


	if (local->ops->conf_tx) {
		struct ieee80211_tx_queue_params qparam;

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

		qparam.aifs = 2;

		if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
		    !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
			qparam.cw_min = 31;
		else
			qparam.cw_min = 15;

		qparam.cw_max = 1023;
		qparam.txop = 0;

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		for (i = 0; i < local_to_hw(local)->queues; i++)
			local->ops->conf_tx(local_to_hw(local), i, &qparam);
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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);
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		params.txop = get_unaligned_le16(pos + 2);
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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		printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
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		       "cWmin=%d cWmax=%d txop=%d\n",
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		       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 "
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			       "parameters for queue %d\n", local->mdev->name, queue);
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		}
	}
}

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static u32 ieee80211_handle_protect_preamb(struct ieee80211_sub_if_data *sdata,
					   bool use_protection,
					   bool use_short_preamble)
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{
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	struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
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	DECLARE_MAC_BUF(mac);
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#endif
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	u32 changed = 0;
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	if (use_protection != bss_conf->use_cts_prot) {
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
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			       "%s)\n",
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			       sdata->dev->name,
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			       use_protection ? "enabled" : "disabled",
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			       print_mac(mac, ifsta->bssid));
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		}
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#endif
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		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
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	}
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	if (use_short_preamble != bss_conf->use_short_preamble) {
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: switched to %s barker preamble"
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			       " (BSSID=%s)\n",
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			       sdata->dev->name,
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			       use_short_preamble ? "short" : "long",
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			       print_mac(mac, ifsta->bssid));
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		}
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#endif
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		bss_conf->use_short_preamble = use_short_preamble;
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		changed |= BSS_CHANGED_ERP_PREAMBLE;
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	}
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	return changed;
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}

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static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
				   u8 erp_value)
{
	bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
	bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;

	return ieee80211_handle_protect_preamb(sdata,
			use_protection, use_short_preamble);
}

static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   struct ieee80211_sta_bss *bss)
{
	u32 changed = 0;

	if (bss->has_erp_value)
		changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
	else {
		u16 capab = bss->capability;
		changed |= ieee80211_handle_protect_preamb(sdata, false,
				(capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
	}

	return changed;
}

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int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
				   struct ieee80211_ht_info *ht_info)
{

	if (ht_info == NULL)
		return -EINVAL;

	memset(ht_info, 0, sizeof(*ht_info));

	if (ht_cap_ie) {
		u8 ampdu_info = ht_cap_ie->ampdu_params_info;

		ht_info->ht_supported = 1;
		ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
		ht_info->ampdu_factor =
			ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
		ht_info->ampdu_density =
			(ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
		memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
	} else
		ht_info->ht_supported = 0;

	return 0;
}

int ieee80211_ht_addt_info_ie_to_ht_bss_info(
			struct ieee80211_ht_addt_info *ht_add_info_ie,
			struct ieee80211_ht_bss_info *bss_info)
{
	if (bss_info == NULL)
		return -EINVAL;

	memset(bss_info, 0, sizeof(*bss_info));

	if (ht_add_info_ie) {
		u16 op_mode;
		op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);

		bss_info->primary_channel = ht_add_info_ie->control_chan;
		bss_info->bss_cap = ht_add_info_ie->ht_param;
		bss_info->bss_op_mode = (u8)(op_mode & 0xff);
	}

	return 0;
}
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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)
{
	union iwreq_data wrqu;

	if (ifsta->assocreq_ies) {
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		memset(&wrqu, 0, sizeof(wrqu));
		wrqu.data.length = ifsta->assocreq_ies_len;
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		wireless_send_event(sdata->dev, IWEVASSOCREQIE, &wrqu,
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				    ifsta->assocreq_ies);
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	}
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	if (ifsta->assocresp_ies) {
		memset(&wrqu, 0, sizeof(wrqu));
		wrqu.data.length = ifsta->assocresp_ies_len;
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		wireless_send_event(sdata->dev, IWEVASSOCRESPIE, &wrqu,
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				    ifsta->assocresp_ies);
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	}
}


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static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
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				     struct ieee80211_if_sta *ifsta,
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				     bool assoc)
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{
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	struct ieee80211_local *local = sdata->local;
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	struct ieee80211_conf *conf = &local_to_hw(local)->conf;
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	union iwreq_data wrqu;
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	u32 changed = BSS_CHANGED_ASSOC;
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	if (assoc) {
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		struct ieee80211_sta_bss *bss;
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		ifsta->flags |= IEEE80211_STA_ASSOCIATED;

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		if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
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			return;
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		bss = ieee80211_rx_bss_get(local, ifsta->bssid,
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					   conf->channel->center_freq,
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					   ifsta->ssid, ifsta->ssid_len);
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		if (bss) {
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			/* set timing information */
			sdata->bss_conf.beacon_int = bss->beacon_int;
			sdata->bss_conf.timestamp = bss->timestamp;
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			sdata->bss_conf.dtim_period = bss->dtim_period;
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			changed |= ieee80211_handle_bss_capability(sdata, bss);
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			ieee80211_rx_bss_put(local, bss);
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		}

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		if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
			changed |= BSS_CHANGED_HT;
			sdata->bss_conf.assoc_ht = 1;
			sdata->bss_conf.ht_conf = &conf->ht_conf;
			sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
		}

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		ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
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		memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
		memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
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		ieee80211_sta_send_associnfo(sdata, ifsta);
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	} else {
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		ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
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		changed |= ieee80211_reset_erp_info(sdata);
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		sdata->bss_conf.assoc_ht = 0;
		sdata->bss_conf.ht_conf = NULL;
		sdata->bss_conf.ht_bss_conf = NULL;

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		memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
	}
	ifsta->last_probe = jiffies;
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	ieee80211_led_assoc(local, assoc);
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	sdata->bss_conf.assoc = assoc;
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	ieee80211_bss_info_change_notify(sdata, changed);
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	if (assoc)
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		netif_carrier_on(sdata->dev);
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	wrqu.ap_addr.sa_family = ARPHRD_ETHER;
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	wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
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}

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void ieee80211_sta_tx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
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		      int encrypt)
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{
	skb->dev = sdata->local->mdev;
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

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	skb->iif = sdata->dev->ifindex;
	skb->do_not_encrypt = !encrypt;
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	dev_queue_xmit(skb);
}


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static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
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				struct ieee80211_if_sta *ifsta,
				int transaction, u8 *extra, size_t extra_len,
				int encrypt)
{
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	struct ieee80211_local *local = sdata->local;
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	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 "
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		       "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 + 6);
	memset(mgmt, 0, 24 + 6);
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	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_AUTH);
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	if (encrypt)
		mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
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	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
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	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);

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	ieee80211_sta_tx(sdata, skb, encrypt);
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}

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static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_if_sta *ifsta)
{
	DECLARE_MAC_BUF(mac);

	ifsta->direct_probe_tries++;
	if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
		printk(KERN_DEBUG "%s: direct probe to AP %s timed out\n",
		       sdata->dev->name, print_mac(mac, ifsta->bssid));
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
		return;
	}

	printk(KERN_DEBUG "%s: direct probe to AP %s try %d\n",
			sdata->dev->name, print_mac(mac, ifsta->bssid),
			ifsta->direct_probe_tries);

	ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;

	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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static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
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				   struct ieee80211_if_sta *ifsta)
{
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	DECLARE_MAC_BUF(mac);

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	ifsta->auth_tries++;
	if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
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		printk(KERN_DEBUG "%s: authentication with AP %s"
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		       " timed out\n",
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		       sdata->dev->name, print_mac(mac, ifsta->bssid));
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		ifsta->state = IEEE80211_STA_MLME_DISABLED;
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		return;
	}

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	ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
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	printk(KERN_DEBUG "%s: authenticate with AP %s\n",
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	       sdata->dev->name, print_mac(mac, ifsta->bssid));
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	ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
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	mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
}

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static int ieee80211_compatible_rates(struct ieee80211_sta_bss *bss,
				      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;
}
566

567
static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
568 569
				 struct ieee80211_if_sta *ifsta)
{
570
	struct ieee80211_local *local = sdata->local;
571 572
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
573
	u8 *pos, *ies, *ht_add_ie;
574
	int i, len, count, rates_len, supp_rates_len;
575 576 577
	u16 capab;
	struct ieee80211_sta_bss *bss;
	int wmm = 0;
578
	struct ieee80211_supported_band *sband;
579
	u64 rates = 0;
580 581 582 583 584 585

	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 "
586
		       "frame\n", sdata->dev->name);
587 588 589 590
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

591 592
	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

593
	capab = ifsta->capab;
594 595 596 597 598 599

	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;
600
	}
601

602
	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
603
				   local->hw.conf.channel->center_freq,
604
				   ifsta->ssid, ifsta->ssid_len);
605 606 607
	if (bss) {
		if (bss->capability & WLAN_CAPABILITY_PRIVACY)
			capab |= WLAN_CAPABILITY_PRIVACY;
608
		if (bss->wmm_used)
609
			wmm = 1;
610 611 612 613 614 615 616

		/* 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);

617 618 619 620
		if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
		    (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
			capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;

621
		ieee80211_rx_bss_put(local, bss);
622 623 624
	} else {
		rates = ~0;
		rates_len = sband->n_bitrates;
625 626 627 628 629
	}

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
630
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
631 632
	memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);

633
	if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
634
		skb_put(skb, 10);
635 636
		mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						  IEEE80211_STYPE_REASSOC_REQ);
637
		mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
638 639
		mgmt->u.reassoc_req.listen_interval =
				cpu_to_le16(local->hw.conf.listen_interval);
640 641 642 643
		memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
		       ETH_ALEN);
	} else {
		skb_put(skb, 4);
644 645
		mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						  IEEE80211_STYPE_ASSOC_REQ);
646
		mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
647 648
		mgmt->u.reassoc_req.listen_interval =
				cpu_to_le16(local->hw.conf.listen_interval);
649 650 651 652 653 654 655 656
	}

	/* 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);

657
	/* add all rates which were marked to be used above */
658 659 660 661
	supp_rates_len = rates_len;
	if (supp_rates_len > 8)
		supp_rates_len = 8;

662
	len = sband->n_bitrates;
663
	pos = skb_put(skb, supp_rates_len + 2);
664
	*pos++ = WLAN_EID_SUPP_RATES;
665
	*pos++ = supp_rates_len;
666

667 668 669
	count = 0;
	for (i = 0; i < sband->n_bitrates; i++) {
		if (BIT(i) & rates) {
670
			int rate = sband->bitrates[i].bitrate;
671
			*pos++ = (u8) (rate / 5);
672 673 674 675 676
			if (++count == 8)
				break;
		}
	}

677
	if (rates_len > count) {
678 679 680 681 682 683 684 685 686
		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);
			}
687 688 689
		}
	}

690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709
	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*/
		}
	}

710 711 712 713 714
	if (ifsta->extra_ie) {
		pos = skb_put(skb, ifsta->extra_ie_len);
		memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
	}

715
	if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
716 717 718 719 720 721 722 723 724 725 726
		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;
	}
727

728
	/* wmm support is a must to HT */
729
	if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
730 731
	    sband->ht_info.ht_supported &&
	    (ht_add_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_EXTRA_INFO))) {
732
		struct ieee80211_ht_addt_info *ht_add_info =
733
			(struct ieee80211_ht_addt_info *)ht_add_ie;
734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753
		u16 cap = sband->ht_info.cap;
		__le16 tmp;
		u32 flags = local->hw.conf.channel->flags;

		switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) {
		case IEEE80211_HT_IE_CHA_SEC_ABOVE:
			if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
				cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
				cap &= ~IEEE80211_HT_CAP_SGI_40;
			}
			break;
		case IEEE80211_HT_IE_CHA_SEC_BELOW:
			if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
				cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
				cap &= ~IEEE80211_HT_CAP_SGI_40;
			}
			break;
		}

		tmp = cpu_to_le16(cap);
754 755 756 757 758 759
		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);
760 761 762 763
		/* TODO: needs a define here for << 2 */
		*pos++ = sband->ht_info.ampdu_factor |
			 (sband->ht_info.ampdu_density << 2);
		memcpy(pos, sband->ht_info.supp_mcs_set, 16);
764
	}
765 766 767

	kfree(ifsta->assocreq_ies);
	ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
768
	ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
769 770 771
	if (ifsta->assocreq_ies)
		memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);

772
	ieee80211_sta_tx(sdata, skb, 0);
773 774 775
}


776
static void ieee80211_send_deauth(struct ieee80211_sub_if_data *sdata,
777 778
				  struct ieee80211_if_sta *ifsta, u16 reason)
{
779
	struct ieee80211_local *local = sdata->local;
780 781 782 783 784 785
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
786
		       "frame\n", sdata->dev->name);
787 788 789 790 791 792 793
		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);
794
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
795
	memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
796 797
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_DEAUTH);
798 799 800
	skb_put(skb, 2);
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

801
	ieee80211_sta_tx(sdata, skb, 0);
802 803 804
}


805
static void ieee80211_send_disassoc(struct ieee80211_sub_if_data *sdata,
806 807
				    struct ieee80211_if_sta *ifsta, u16 reason)
{
808
	struct ieee80211_local *local = sdata->local;
809 810 811 812 813 814
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
815
		       "frame\n", sdata->dev->name);
816 817 818 819 820 821 822
		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);
823
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
824
	memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
825 826
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_DISASSOC);
827 828 829
	skb_put(skb, 2);
	mgmt->u.disassoc.reason_code = cpu_to_le16(reason);

830
	ieee80211_sta_tx(sdata, skb, 0);
831 832
}

833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876
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;

	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;

	netif_carrier_off(sdata->dev);

	ieee80211_sta_tear_down_BA_sessions(sdata, sta->addr);

	if (self_disconnected) {
		if (deauth)
			ieee80211_send_deauth(sdata, ifsta, reason);
		else
			ieee80211_send_disassoc(sdata, ifsta, reason);
	}

	ieee80211_set_associated(sdata, ifsta, 0);

	if (self_disconnected)
		ifsta->state = IEEE80211_STA_MLME_DISABLED;

	sta_info_unlink(&sta);

	rcu_read_unlock();

	sta_info_destroy(sta);
}
877

878
static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
879 880
				      struct ieee80211_if_sta *ifsta)
{
881
	struct ieee80211_local *local = sdata->local;
882
	struct ieee80211_sta_bss *bss;
883 884 885
	int bss_privacy;
	int wep_privacy;
	int privacy_invoked;
886

887
	if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
888 889
		return 0;

890
	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
891
				   local->hw.conf.channel->center_freq,
892
				   ifsta->ssid, ifsta->ssid_len);
893 894 895
	if (!bss)
		return 0;

896
	bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
897
	wep_privacy = !!ieee80211_sta_wep_configured(sdata);
898
	privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
899

900
	ieee80211_rx_bss_put(local, bss);
901

902 903 904 905
	if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
		return 0;

	return 1;
906 907 908
}


909
static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
910 911
				struct ieee80211_if_sta *ifsta)
{
912 913
	DECLARE_MAC_BUF(mac);

914 915
	ifsta->assoc_tries++;
	if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
916
		printk(KERN_DEBUG "%s: association with AP %s"
917
		       " timed out\n",
918
		       sdata->dev->name, print_mac(mac, ifsta->bssid));
919
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
920 921 922
		return;
	}

923
	ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
924
	printk(KERN_DEBUG "%s: associate with AP %s\n",
925 926
	       sdata->dev->name, print_mac(mac, ifsta->bssid));
	if (ieee80211_privacy_mismatch(sdata, ifsta)) {
927
		printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
928
		       "mixed-cell disabled - abort association\n", sdata->dev->name);
929
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
930 931 932
		return;
	}

933
	ieee80211_send_assoc(sdata, ifsta);
934 935 936 937 938

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


939
static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
940 941
				 struct ieee80211_if_sta *ifsta)
{
942
	struct ieee80211_local *local = sdata->local;
943 944
	struct sta_info *sta;
	int disassoc;
945
	DECLARE_MAC_BUF(mac);
946 947 948 949 950 951

	/* 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 */

952
	ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
953

954 955
	rcu_read_lock();

956 957
	sta = sta_info_get(local, ifsta->bssid);
	if (!sta) {
958
		printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
959
		       sdata->dev->name, print_mac(mac, ifsta->bssid));
960 961 962 963 964
		disassoc = 1;
	} else {
		disassoc = 0;
		if (time_after(jiffies,
			       sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
965
			if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
966
				printk(KERN_DEBUG "%s: No ProbeResp from "
967
				       "current AP %s - assume out of "
968
				       "range\n",
969
				       sdata->dev->name, print_mac(mac, ifsta->bssid));
970
				disassoc = 1;
971
			} else
972
				ieee80211_send_probe_req(sdata, ifsta->bssid,
973 974
							 local->scan_ssid,
							 local->scan_ssid_len);
975
			ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
976
		} else {
977
			ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
978 979 980
			if (time_after(jiffies, ifsta->last_probe +
				       IEEE80211_PROBE_INTERVAL)) {
				ifsta->last_probe = jiffies;
981
				ieee80211_send_probe_req(sdata, ifsta->bssid,
982 983 984 985 986
							 ifsta->ssid,
							 ifsta->ssid_len);
			}
		}
	}
987 988 989

	rcu_read_unlock();

990 991 992 993
	if (disassoc)
		ieee80211_set_disassoc(sdata, ifsta, true, true,
					WLAN_REASON_PREV_AUTH_NOT_VALID);
	else
994 995 996 997 998
		mod_timer(&ifsta->timer, jiffies +
				      IEEE80211_MONITORING_INTERVAL);
}


999
static void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1000 1001
				     u8 *ssid, size_t ssid_len)
{
1002
	struct ieee80211_local *local = sdata->local;
1003
	struct ieee80211_supported_band *sband;
1004 1005 1006 1007 1008 1009 1010 1011
	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 "
1012
		       "request\n", sdata->dev->name);
1013 1014 1015 1016 1017 1018
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
1019 1020
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_PROBE_REQ);
1021
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
	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;
1037 1038 1039 1040
	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];
1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052
		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]++;
		}
1053
		*pos = rate->bitrate / 5;
1054 1055
	}

1056
	ieee80211_sta_tx(sdata, skb, 0);
1057 1058 1059
}


1060
static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1061 1062
{
	if (!sdata || !sdata->default_key ||
1063
	    sdata->default_key->conf.alg != ALG_WEP)
1064 1065 1066 1067 1068
		return 0;
	return 1;
}


1069
static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1070 1071
				     struct ieee80211_if_sta *ifsta)
{
1072
	printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1073
	ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1074
	ieee80211_associate(sdata, ifsta);
1075 1076 1077
}


1078
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1079 1080 1081 1082 1083 1084 1085 1086
				     struct ieee80211_if_sta *ifsta,
				     struct ieee80211_mgmt *mgmt,
				     size_t len)
{
	u8 *pos;
	struct ieee802_11_elems elems;

	pos = mgmt->u.auth.variable;
1087
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1088
	if (!elems.challenge)
1089
		return;
1090
	ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1091 1092 1093
			    elems.challenge_len + 2, 1);
}

1094
static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
1095 1096 1097 1098
					u8 dialog_token, u16 status, u16 policy,
					u16 buf_size, u16 timeout)
{
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1099
	struct ieee80211_local *local = sdata->local;
1100 1101 1102 1103
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u16 capab;

1104 1105
	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);

1106 1107
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer "
1108
		       "for addba resp frame\n", sdata->dev->name);
1109 1110 1111 1112 1113 1114 1115
		return;
	}

	skb_reserve(skb, local->hw.extra_tx_headroom);
	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, da, ETH_ALEN);
1116
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1117
	if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1118
		memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1119 1120
	else
		memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1121 1122
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_ACTION);
1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136

	skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
	mgmt->u.action.u.addba_resp.dialog_token = dialog_token;

	capab = (u16)(policy << 1);	/* bit 1 aggregation policy */
	capab |= (u16)(tid << 2); 	/* bit 5:2 TID number */
	capab |= (u16)(buf_size << 6);	/* bit 15:6 max size of aggregation */

	mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
	mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
	mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);

1137
	ieee80211_sta_tx(sdata, skb, 0);
1138 1139 1140 1141

	return;
}

1142
void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, const u8 *da,
1143 1144 1145
				u16 tid, u8 dialog_token, u16 start_seq_num,
				u16 agg_size, u16 timeout)
{
1146
	struct ieee80211_local *local = sdata->local;
1147 1148 1149 1150 1151
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u16 capab;