ieee80211_sta.c 92.7 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>
#include <net/iw_handler.h>
#include <asm/types.h>

#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "ieee80211_rate.h"
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#include "ieee80211_led.h"
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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)
#define IEEE80211_IBSS_JOIN_TIMEOUT (20 * HZ)

#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)

#define IEEE80211_IBSS_MAX_STA_ENTRIES 128


#define IEEE80211_FC(type, stype) cpu_to_le16(type | stype)

#define ERP_INFO_USE_PROTECTION BIT(1)

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/* mgmt header + 1 byte action code */
#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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static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
				     u8 *ssid, size_t ssid_len);
static struct ieee80211_sta_bss *
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ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel,
		     u8 *ssid, u8 ssid_len);
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static void ieee80211_rx_bss_put(struct net_device *dev,
				 struct ieee80211_sta_bss *bss);
static int ieee80211_sta_find_ibss(struct net_device *dev,
				   struct ieee80211_if_sta *ifsta);
static int ieee80211_sta_wep_configured(struct net_device *dev);
static int ieee80211_sta_start_scan(struct net_device *dev,
				    u8 *ssid, size_t ssid_len);
static int ieee80211_sta_config_auth(struct net_device *dev,
				     struct ieee80211_if_sta *ifsta);


/* Parsed Information Elements */
struct ieee802_11_elems {
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	/* pointers to IEs */
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	u8 *ssid;
	u8 *supp_rates;
	u8 *fh_params;
	u8 *ds_params;
	u8 *cf_params;
	u8 *tim;
	u8 *ibss_params;
	u8 *challenge;
	u8 *wpa;
	u8 *rsn;
	u8 *erp_info;
	u8 *ext_supp_rates;
	u8 *wmm_info;
	u8 *wmm_param;
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	u8 *ht_cap_elem;
	u8 *ht_info_elem;
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	/* length of them, respectively */
	u8 ssid_len;
	u8 supp_rates_len;
	u8 fh_params_len;
	u8 ds_params_len;
	u8 cf_params_len;
	u8 tim_len;
	u8 ibss_params_len;
	u8 challenge_len;
	u8 wpa_len;
	u8 rsn_len;
	u8 erp_info_len;
	u8 ext_supp_rates_len;
	u8 wmm_info_len;
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	u8 wmm_param_len;
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	u8 ht_cap_elem_len;
	u8 ht_info_elem_len;
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};

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static void ieee802_11_parse_elems(u8 *start, size_t len,
				   struct ieee802_11_elems *elems)
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{
	size_t left = len;
	u8 *pos = start;

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

	while (left >= 2) {
		u8 id, elen;

		id = *pos++;
		elen = *pos++;
		left -= 2;

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		if (elen > left)
			return;
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		switch (id) {
		case WLAN_EID_SSID:
			elems->ssid = pos;
			elems->ssid_len = elen;
			break;
		case WLAN_EID_SUPP_RATES:
			elems->supp_rates = pos;
			elems->supp_rates_len = elen;
			break;
		case WLAN_EID_FH_PARAMS:
			elems->fh_params = pos;
			elems->fh_params_len = elen;
			break;
		case WLAN_EID_DS_PARAMS:
			elems->ds_params = pos;
			elems->ds_params_len = elen;
			break;
		case WLAN_EID_CF_PARAMS:
			elems->cf_params = pos;
			elems->cf_params_len = elen;
			break;
		case WLAN_EID_TIM:
			elems->tim = pos;
			elems->tim_len = elen;
			break;
		case WLAN_EID_IBSS_PARAMS:
			elems->ibss_params = pos;
			elems->ibss_params_len = elen;
			break;
		case WLAN_EID_CHALLENGE:
			elems->challenge = pos;
			elems->challenge_len = elen;
			break;
		case WLAN_EID_WPA:
			if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
			    pos[2] == 0xf2) {
				/* Microsoft OUI (00:50:F2) */
				if (pos[3] == 1) {
					/* OUI Type 1 - WPA IE */
					elems->wpa = pos;
					elems->wpa_len = elen;
				} else if (elen >= 5 && pos[3] == 2) {
					if (pos[4] == 0) {
						elems->wmm_info = pos;
						elems->wmm_info_len = elen;
					} else if (pos[4] == 1) {
						elems->wmm_param = pos;
						elems->wmm_param_len = elen;
					}
				}
			}
			break;
		case WLAN_EID_RSN:
			elems->rsn = pos;
			elems->rsn_len = elen;
			break;
		case WLAN_EID_ERP_INFO:
			elems->erp_info = pos;
			elems->erp_info_len = elen;
			break;
		case WLAN_EID_EXT_SUPP_RATES:
			elems->ext_supp_rates = pos;
			elems->ext_supp_rates_len = elen;
			break;
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		case WLAN_EID_HT_CAPABILITY:
			elems->ht_cap_elem = pos;
			elems->ht_cap_elem_len = elen;
			break;
		case WLAN_EID_HT_EXTRA_INFO:
			elems->ht_info_elem = pos;
			elems->ht_info_elem_len = elen;
			break;
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		default:
			break;
		}

		left -= elen;
		pos += elen;
	}
}


static int ecw2cw(int ecw)
{
	int cw = 1;
	while (ecw > 0) {
		cw <<= 1;
		ecw--;
	}
	return cw - 1;
}

static void ieee80211_sta_wmm_params(struct net_device *dev,
				     struct ieee80211_if_sta *ifsta,
				     u8 *wmm_param, size_t wmm_param_len)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_tx_queue_params params;
	size_t left;
	int count;
	u8 *pos;

	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:
			queue = IEEE80211_TX_QUEUE_DATA3;
			if (acm) {
				local->wmm_acm |= BIT(0) | BIT(3);
			}
			break;
		case 2:
			queue = IEEE80211_TX_QUEUE_DATA1;
			if (acm) {
				local->wmm_acm |= BIT(4) | BIT(5);
			}
			break;
		case 3:
			queue = IEEE80211_TX_QUEUE_DATA0;
			if (acm) {
				local->wmm_acm |= BIT(6) | BIT(7);
			}
			break;
		case 0:
		default:
			queue = IEEE80211_TX_QUEUE_DATA2;
			if (acm) {
				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);
		/* TXOP is in units of 32 usec; burst_time in 0.1 ms */
		params.burst_time = (pos[2] | (pos[3] << 8)) * 32 / 100;
		printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
		       "cWmin=%d cWmax=%d burst=%d\n",
		       dev->name, queue, aci, acm, params.aifs, params.cw_min,
		       params.cw_max, params.burst_time);
		/* 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 "
			       "parameters for queue %d\n", dev->name, queue);
		}
	}
}


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static void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
	int use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
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	int preamble_mode = (erp_value & WLAN_ERP_BARKER_PREAMBLE) != 0;
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	u8 changes = 0;
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	DECLARE_MAC_BUF(mac);
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	if (use_protection != !!(sdata->flags & IEEE80211_SDATA_USE_PROTECTION)) {
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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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			       dev->name,
			       use_protection ? "enabled" : "disabled",
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			       print_mac(mac, ifsta->bssid));
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		}
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		if (use_protection)
			sdata->flags |= IEEE80211_SDATA_USE_PROTECTION;
		else
			sdata->flags &= ~IEEE80211_SDATA_USE_PROTECTION;
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		changes |= IEEE80211_ERP_CHANGE_PROTECTION;
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	}
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	if (preamble_mode != !(sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE)) {
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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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			       dev->name,
			       (preamble_mode == WLAN_ERP_PREAMBLE_SHORT) ?
					"short" : "long",
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			       print_mac(mac, ifsta->bssid));
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		}
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		if (preamble_mode)
			sdata->flags &= ~IEEE80211_SDATA_SHORT_PREAMBLE;
		else
			sdata->flags |= IEEE80211_SDATA_SHORT_PREAMBLE;
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		changes |= IEEE80211_ERP_CHANGE_PREAMBLE;
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	}
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	if (changes)
		ieee80211_erp_info_change_notify(dev, changes);
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}

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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 net_device *dev,
					 struct ieee80211_if_sta *ifsta)
{
	char *buf;
	size_t len;
	int i;
	union iwreq_data wrqu;

	if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
		return;

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

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

	memset(&wrqu, 0, sizeof(wrqu));
	wrqu.data.length = len;
	wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);

	kfree(buf);
}


static void ieee80211_set_associated(struct net_device *dev,
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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 = wdev_priv(dev->ieee80211_ptr);
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	union iwreq_data wrqu;

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	if (!!(ifsta->flags & IEEE80211_STA_ASSOCIATED) == assoc)
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		return;

	if (assoc) {
		struct ieee80211_sub_if_data *sdata;
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		struct ieee80211_sta_bss *bss;
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		ifsta->flags |= IEEE80211_STA_ASSOCIATED;

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		sdata = IEEE80211_DEV_TO_SUB_IF(dev);
		if (sdata->type != IEEE80211_IF_TYPE_STA)
			return;
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		bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
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					   local->hw.conf.channel,
					   ifsta->ssid, ifsta->ssid_len);
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		if (bss) {
			if (bss->has_erp_value)
				ieee80211_handle_erp_ie(dev, bss->erp_value);
			ieee80211_rx_bss_put(dev, bss);
		}

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		netif_carrier_on(dev);
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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);
		ieee80211_sta_send_associnfo(dev, ifsta);
	} else {
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		ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;

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		netif_carrier_off(dev);
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		ieee80211_reset_erp_info(dev);
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		memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
	}
	wrqu.ap_addr.sa_family = ARPHRD_ETHER;
	wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
	ifsta->last_probe = jiffies;
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	ieee80211_led_assoc(local, assoc);
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}

static void ieee80211_set_disassoc(struct net_device *dev,
				   struct ieee80211_if_sta *ifsta, int deauth)
{
	if (deauth)
		ifsta->auth_tries = 0;
	ifsta->assoc_tries = 0;
	ieee80211_set_associated(dev, ifsta, 0);
}

static void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
			     int encrypt)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_tx_packet_data *pkt_data;

	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	skb->dev = sdata->local->mdev;
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

	pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
	memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
	pkt_data->ifindex = sdata->dev->ifindex;
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	if (!encrypt)
		pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
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	dev_queue_xmit(skb);
}


static void ieee80211_send_auth(struct net_device *dev,
				struct ieee80211_if_sta *ifsta,
				int transaction, u8 *extra, size_t extra_len,
				int encrypt)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	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", 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 = IEEE80211_FC(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, 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_sta_tx(dev, skb, encrypt);
}


static void ieee80211_authenticate(struct net_device *dev,
				   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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		       dev->name, print_mac(mac, ifsta->bssid));
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		ifsta->state = IEEE80211_DISABLED;
		return;
	}

	ifsta->state = IEEE80211_AUTHENTICATE;
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	printk(KERN_DEBUG "%s: authenticate with AP %s\n",
	       dev->name, print_mac(mac, ifsta->bssid));
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	ieee80211_send_auth(dev, ifsta, 1, NULL, 0, 0);

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


static void ieee80211_send_assoc(struct net_device *dev,
				 struct ieee80211_if_sta *ifsta)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_hw_mode *mode;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u8 *pos, *ies;
	int i, len;
	u16 capab;
	struct ieee80211_sta_bss *bss;
	int wmm = 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", dev->name);
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mode = local->oper_hw_mode;
	capab = ifsta->capab;
	if (mode->mode == MODE_IEEE80211G) {
		capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME |
			WLAN_CAPABILITY_SHORT_PREAMBLE;
	}
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	bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel,
				   ifsta->ssid, ifsta->ssid_len);
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	if (bss) {
		if (bss->capability & WLAN_CAPABILITY_PRIVACY)
			capab |= WLAN_CAPABILITY_PRIVACY;
		if (bss->wmm_ie) {
			wmm = 1;
		}
		ieee80211_rx_bss_put(dev, bss);
	}

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

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	if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
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		skb_put(skb, 10);
		mgmt->frame_control = IEEE80211_FC(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(1);
		memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
		       ETH_ALEN);
	} else {
		skb_put(skb, 4);
		mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
						   IEEE80211_STYPE_ASSOC_REQ);
		mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
		mgmt->u.assoc_req.listen_interval = cpu_to_le16(1);
	}

	/* 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);

	len = mode->num_rates;
	if (len > 8)
		len = 8;
	pos = skb_put(skb, len + 2);
	*pos++ = WLAN_EID_SUPP_RATES;
	*pos++ = len;
	for (i = 0; i < len; i++) {
		int rate = mode->rates[i].rate;
		*pos++ = (u8) (rate / 5);
	}

	if (mode->num_rates > len) {
		pos = skb_put(skb, mode->num_rates - len + 2);
		*pos++ = WLAN_EID_EXT_SUPP_RATES;
		*pos++ = mode->num_rates - len;
		for (i = len; i < mode->num_rates; i++) {
			int rate = mode->rates[i].rate;
			*pos++ = (u8) (rate / 5);
		}
	}

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

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	if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
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		pos = skb_put(skb, 9);
		*pos++ = WLAN_EID_VENDOR_SPECIFIC;
		*pos++ = 7; /* len */
		*pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
		*pos++ = 0x50;
		*pos++ = 0xf2;
		*pos++ = 2; /* WME */
		*pos++ = 0; /* WME info */
		*pos++ = 1; /* WME ver */
		*pos++ = 0;
	}
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	/* wmm support is a must to HT */
	if (wmm && mode->ht_info.ht_supported) {
		__le16 tmp = cpu_to_le16(mode->ht_info.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);
		*pos++ = (mode->ht_info.ampdu_factor |
				(mode->ht_info.ampdu_density << 2));
		memcpy(pos, mode->ht_info.supp_mcs_set, 16);
	}
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	kfree(ifsta->assocreq_ies);
	ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
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	ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
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	if (ifsta->assocreq_ies)
		memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);

	ieee80211_sta_tx(dev, skb, 0);
}


static void ieee80211_send_deauth(struct net_device *dev,
				  struct ieee80211_if_sta *ifsta, u16 reason)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	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 "
		       "frame\n", dev->name);
		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, dev->dev_addr, ETH_ALEN);
	memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
	mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
					   IEEE80211_STYPE_DEAUTH);
	skb_put(skb, 2);
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

	ieee80211_sta_tx(dev, skb, 0);
}


static void ieee80211_send_disassoc(struct net_device *dev,
				    struct ieee80211_if_sta *ifsta, u16 reason)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	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 "
		       "frame\n", dev->name);
		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, dev->dev_addr, ETH_ALEN);
	memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
	mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
					   IEEE80211_STYPE_DISASSOC);
	skb_put(skb, 2);
	mgmt->u.disassoc.reason_code = cpu_to_le16(reason);

	ieee80211_sta_tx(dev, skb, 0);
}


static int ieee80211_privacy_mismatch(struct net_device *dev,
				      struct ieee80211_if_sta *ifsta)
{
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	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
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	struct ieee80211_sta_bss *bss;
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	int bss_privacy;
	int wep_privacy;
	int privacy_invoked;
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	if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
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		return 0;

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	bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel,
				   ifsta->ssid, ifsta->ssid_len);
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	if (!bss)
		return 0;

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	bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
	wep_privacy = !!ieee80211_sta_wep_configured(dev);
	privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
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	ieee80211_rx_bss_put(dev, bss);

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	if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
		return 0;

	return 1;
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}


static void ieee80211_associate(struct net_device *dev,
				struct ieee80211_if_sta *ifsta)
{
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	DECLARE_MAC_BUF(mac);

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	ifsta->assoc_tries++;
	if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
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		printk(KERN_DEBUG "%s: association with AP %s"
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		       " timed out\n",
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		       dev->name, print_mac(mac, ifsta->bssid));
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		ifsta->state = IEEE80211_DISABLED;
		return;
	}

	ifsta->state = IEEE80211_ASSOCIATE;
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	printk(KERN_DEBUG "%s: associate with AP %s\n",
	       dev->name, print_mac(mac, ifsta->bssid));
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	if (ieee80211_privacy_mismatch(dev, ifsta)) {
		printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
		       "mixed-cell disabled - abort association\n", dev->name);
		ifsta->state = IEEE80211_DISABLED;
		return;
	}

	ieee80211_send_assoc(dev, ifsta);

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


static void ieee80211_associated(struct net_device *dev,
				 struct ieee80211_if_sta *ifsta)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct sta_info *sta;
	int disassoc;
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	DECLARE_MAC_BUF(mac);
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	/* 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 */

	ifsta->state = IEEE80211_ASSOCIATED;

	sta = sta_info_get(local, ifsta->bssid);
	if (!sta) {
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		printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
		       dev->name, print_mac(mac, ifsta->bssid));
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		disassoc = 1;
	} else {
		disassoc = 0;
		if (time_after(jiffies,
			       sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
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			if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
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				printk(KERN_DEBUG "%s: No ProbeResp from "
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				       "current AP %s - assume out of "
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				       "range\n",
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				       dev->name, print_mac(mac, ifsta->bssid));
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				disassoc = 1;
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				sta_info_free(sta);
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			} else
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				ieee80211_send_probe_req(dev, ifsta->bssid,
							 local->scan_ssid,
							 local->scan_ssid_len);
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			ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
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		} else {
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			ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
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			if (time_after(jiffies, ifsta->last_probe +
				       IEEE80211_PROBE_INTERVAL)) {
				ifsta->last_probe = jiffies;
				ieee80211_send_probe_req(dev, ifsta->bssid,
							 ifsta->ssid,
							 ifsta->ssid_len);
			}
		}
		sta_info_put(sta);
	}
	if (disassoc) {
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		ifsta->state = IEEE80211_DISABLED;
		ieee80211_set_associated(dev, ifsta, 0);
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	} else {
		mod_timer(&ifsta->timer, jiffies +
				      IEEE80211_MONITORING_INTERVAL);
	}
}


static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
				     u8 *ssid, size_t ssid_len)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_hw_mode *mode;
	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", 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 = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
					   IEEE80211_STYPE_PROBE_REQ);
	memcpy(mgmt->sa, 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;
	mode = local->oper_hw_mode;
	for (i = 0; i < mode->num_rates; i++) {
		struct ieee80211_rate *rate = &mode->rates[i];
		if (!(rate->flags & IEEE80211_RATE_SUPPORTED))
			continue;
		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]++;
		}
Johannes Berg's avatar
Johannes Berg committed
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		*pos = rate->rate / 5;
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	}

	ieee80211_sta_tx(dev, skb, 0);
}


static int ieee80211_sta_wep_configured(struct net_device *dev)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	if (!sdata || !sdata->default_key ||
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	    sdata->default_key->conf.alg != ALG_WEP)
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		return 0;
	return 1;
}


static void ieee80211_auth_completed(struct net_device *dev,
				     struct ieee80211_if_sta *ifsta)
{
	printk(KERN_DEBUG "%s: authenticated\n", dev->name);
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	ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
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	ieee80211_associate(dev, ifsta);
}


static void ieee80211_auth_challenge(struct net_device *dev,
				     struct ieee80211_if_sta *ifsta,
				     struct ieee80211_mgmt *mgmt,
				     size_t len)
{
	u8 *pos;
	struct ieee802_11_elems elems;

	printk(KERN_DEBUG "%s: replying to auth challenge\n", dev->name);
	pos = mgmt->u.auth.variable;
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	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
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	if (!elems.challenge) {
		printk(KERN_DEBUG "%s: no challenge IE in shared key auth "
		       "frame\n", dev->name);
		return;
	}
	ieee80211_send_auth(dev, ifsta, 3, elems.challenge - 2,
			    elems.challenge_len + 2, 1);
}

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static void ieee80211_send_addba_resp(struct net_device *dev, u8 *da, u16 tid,
					u8 dialog_token, u16 status, u16 policy,
					u16 buf_size, u16 timeout)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u16 capab;

	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer "
		       "for addba resp frame\n", dev->name);
		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);
	memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
	if (sdata->type == IEEE80211_IF_TYPE_AP)
		memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
	else
		memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
	mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
					   IEEE80211_STYPE_ACTION);

	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);

	ieee80211_sta_tx(dev, skb, 0);

	return;
}

static void ieee80211_sta_process_addba_request(struct net_device *dev,
						struct ieee80211_mgmt *mgmt,
						size_t len)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct sta_info *sta;
	u16 capab, tid, timeout, ba_policy, buf_size, status;
	u8 dialog_token;

	sta = sta_info_get(local, mgmt->sa);
	if (!sta)
		return;

	/* extract session parameters from addba request frame */
	dialog_token = mgmt->u.action.u.addba_req.dialog_token;
	timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);

	capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
	ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
	tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
	buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;

	/* TODO - currently aggregation is declined (A-MPDU add BA request
	* acceptance is not obligatory by 802.11n draft), but here is
	* the entry point for dealing with it */
#ifdef MAC80211_HT_DEBUG
	if (net_ratelimit())
		printk(KERN_DEBUG "Add Block Ack request arrived,"
				   " currently denying it\n");
#endif /* MAC80211_HT_DEBUG */

	status = WLAN_STATUS_REQUEST_DECLINED;

	ieee80211_send_addba_resp(sta->dev, sta->addr, tid, dialog_token,
				status, 1, buf_size, timeout);
	sta_info_put(sta);
}
1082
1083
1084
1085
1086
1087
1088
1089

static void ieee80211_rx_mgmt_auth(struct net_device *dev,
				   struct ieee80211_if_sta *ifsta,
				   struct ieee80211_mgmt *mgmt,
				   size_t len)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	u16 auth_alg, auth_transaction, status_code;
1090
	DECLARE_MAC_BUF(mac);
1091
1092
1093
1094

	if (ifsta->state != IEEE80211_AUTHENTICATE &&
	    sdata->type != IEEE80211_IF_TYPE_IBSS) {
		printk(KERN_DEBUG "%s: authentication frame received from "
1095
1096
		       "%s, but not in authenticate state - ignored\n",
		       dev->name, print_mac(mac, mgmt->sa));
1097
1098
1099
1100
1101
		return;
	}

	if (len < 24 + 6) {
		printk(KERN_DEBUG "%s: too short (%zd) authentication frame "
1102
1103
		       "received from %s - ignored\n",
		       dev->name, len, print_mac(mac, mgmt->sa));
1104
1105
1106
1107
1108
1109
		return;
	}

	if (sdata->type != IEEE80211_IF_TYPE_IBSS &&
	    memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
		printk(KERN_DEBUG "%s: authentication frame received from "
1110
1111
1112
		       "unknown AP (SA=%s BSSID=%s) - "
		       "ignored\n", dev->name, print_mac(mac, mgmt->sa),
		       print_mac(mac, mgmt->bssid));
1113
1114
1115
1116
1117
1118
		return;
	}

	if (sdata->type != IEEE80211_IF_TYPE_IBSS &&
	    memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) {
		printk(KERN_DEBUG "%s: authentication frame received from "
1119
1120
1121
		       "unknown BSSID (SA=%s BSSID=%s) - "
		       "ignored\n", dev->name, print_mac(mac, mgmt->sa),
		       print_mac(mac, mgmt->bssid));
1122
1123
1124
1125
1126
1127
1128
		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);

1129
	printk(KERN_DEBUG "%s: RX authentication from %s (alg=%d "
1130
	       "transaction=%d status=%d)\n",
1131
	       dev->name, print_mac(mac, mgmt->sa), auth_alg,
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
	       auth_transaction, status_code);

	if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
		/* IEEE 802.11 standard does not require authentication in IBSS
		 * networks and most implementations do not seem to use it.
		 * However, try to reply to authentication attempts if someone
		 * has actually implemented this.
		 * TODO: Could implement shared key authentication. */
		if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) {
			printk(KERN_DEBUG "%s: unexpected IBSS authentication "
			       "frame (alg=%d transaction=%d)\n",
			       dev->name, auth_alg, auth_transaction);
			return;
		}
		ieee80211_send_auth(dev, ifsta, 2, NULL, 0, 0);
	}

	if (auth_alg != ifsta->auth_alg ||
	    auth_transaction != ifsta->auth_transaction) {
		printk(KERN_DEBUG "%s: unexpected authentication frame "
		       "(alg=%d transaction=%d)\n",
		       dev->name, auth_alg, auth_transaction);
		return;
	}

	if (status_code != WLAN_STATUS_SUCCESS) {
		printk(KERN_DEBUG "%s: AP denied authentication (auth_alg=%d "
		       "code=%d)\n", dev->name, ifsta->auth_alg, status_code);
		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 &&
				    !ieee80211_sta_wep_configured(dev))
					continue;
				ifsta->auth_alg = algs[pos];
				printk(KERN_DEBUG "%s: set auth_alg=%d for "
				       "next try\n",
				       dev->name, ifsta->auth_alg);
				break;
			}
		}
		return;
	}

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


static void ieee80211_rx_mgmt_deauth(struct net_device *dev,
				     struct ieee80211_if_sta *ifsta,
				     struct ieee80211_mgmt *mgmt,
				     size_t len)
{
	u16 reason_code;
1218
	DECLARE_MAC_BUF(mac);
1219
1220
1221

	if (len < 24 + 2) {
		printk(KERN_DEBUG "%s: too short (%zd) deauthentication frame "
1222
1223
		       "received from %s - ignored\n",
		       dev->name, len, print_mac(mac, mgmt->sa));
1224
1225
1226
1227
1228
		return;
	}

	if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
		printk(KERN_DEBUG "%s: deauthentication frame received from "
1229
1230
1231
		       "unknown AP (SA=%s BSSID=%s) - "
		       "ignored\n", dev->name, print_mac(mac, mgmt->sa),
		       print_mac(mac, mgmt->bssid));
1232
1233
1234
1235
1236
		return;
	}

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

1237
	printk(KERN_DEBUG "%s: RX deauthentication from %s"
1238
	       " (reason=%d)\n",
1239
	       dev->name, print_mac(mac, mgmt->sa), reason_code);
1240

1241
	if (ifsta->flags & IEEE80211_STA_AUTHENTICATED) {
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
		printk(KERN_DEBUG "%s: deauthenticated\n", dev->name);
	}

	if (ifsta->state == IEEE80211_AUTHENTICATE ||
	    ifsta->state == IEEE80211_ASSOCIATE ||
	    ifsta->state == IEEE80211_ASSOCIATED) {
		ifsta->state = IEEE80211_AUTHENTICATE;
		mod_timer(&ifsta->timer, jiffies +
				      IEEE80211_RETRY_AUTH_INTERVAL);
	}

	ieee80211_set_disassoc(dev, ifsta, 1);
1254
	ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1255
1256
1257
1258
1259
1260
1261
1262
1263
}


static void ieee80211_rx_mgmt_disassoc(struct net_device *dev,
				       struct ieee80211_if_sta *ifsta,
				       struct ieee80211_mgmt *mgmt,
				       size_t len)
{
	u16 reason_code;
1264
	DECLARE_MAC_BUF(mac);
1265
1266
1267

	if (len < 24 + 2) {
		printk(KERN_DEBUG "%s: too short (%zd) disassociation frame "
1268
1269
		       "received from %s - ignored\n",
		       dev->name, len, print_mac(mac, mgmt->sa));
1270
1271
1272
1273
1274
		return;
	}

	if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
		printk(KERN_DEBUG "%s: disassociation frame received from "
1275
1276
1277
		       "unknown AP (SA=%s BSSID=%s) - "
		       "ignored\n", dev->name, print_mac(mac, mgmt->sa),
		       print_mac(mac, mgmt->bssid));
1278
1279
1280
1281
1282
		return;
	}

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

1283
	printk(KERN_DEBUG "%s: RX disassociation from %s"
1284
	       " (reason=%d)\n",
1285
	       dev->name, print_mac(mac, mgmt->sa), reason_code);
1286

1287
	if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
		printk(KERN_DEBUG "%s: disassociated\n", dev->name);

	if (ifsta->state == IEEE80211_ASSOCIATED) {
		ifsta->state = IEEE80211_ASSOCIATE;
		mod_timer(&ifsta->timer, jiffies +
				      IEEE80211_RETRY_AUTH_INTERVAL);
	}

	ieee80211_set_disassoc(dev, ifsta, 0);
}


static void ieee80211_rx_mgmt_assoc_resp(struct net_device *dev,
					 struct ieee80211_if_sta *ifsta,
					 struct ieee80211_mgmt *mgmt,
					 size_t len,
					 int reassoc)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_hw_mode *mode;
	struct sta_info *sta;
	u32 rates;
	u16 capab_info, status_code, aid;
	struct ieee802_11_elems elems;
	u8 *pos;
	int i, j;
1314
	DECLARE_MAC_BUF(mac);
1315
1316
1317
1318
1319
1320

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

	if (ifsta->state != IEEE80211_ASSOCIATE) {
		printk(KERN_DEBUG "%s: association frame received from "
1321
1322
		       "%s, but not in associate state - ignored\n",
		       dev->name, print_mac(mac, mgmt->sa));
1323
1324
1325
1326
1327
		return;
	}

	if (len < 24 + 6) {
		printk(KERN_DEBUG "%s: too short (%zd) association frame "
1328
1329
		       "received from %s - ignored\n",
		       dev->name, len, print_mac(mac, mgmt->sa));
1330
1331
1332
1333
1334
		return;
	}

	if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
		printk(KERN_DEBUG "%s: association frame received from "
1335
1336
1337
		       "unknown AP (SA=%s BSSID=%s) - "
		       "ignored\n", dev->name, print_mac(mac, mgmt->sa),
		       print_mac(mac, mgmt->bssid));
1338
1339
1340
1341
1342
1343
1344
		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);

1345
	printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
1346
	       "status=%d aid=%d)\n",
1347
	       dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
1348
	       capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1349
1350
1351
1352

	if (status_code != WLAN_STATUS_SUCCESS) {
		printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
		       dev->name, status_code);
1353
1354
1355
		/* 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. */
1356
		ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1357
1358
1359
		return;
	}

1360
1361
1362
1363
1364
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
		printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
		       "set\n", dev->name, aid);
	aid &= ~(BIT(15) | BIT(14));

1365
	pos = mgmt->u.assoc_resp.variable;
1366
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379

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

	printk(KERN_DEBUG "%s: associated\n", dev->name);
	ifsta->aid = aid;
	ifsta->ap_capab = capab_info;

	kfree(ifsta->assocresp_ies);
	ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1380
	ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1381
1382
1383
1384
1385
1386
1387
1388
1389
	if (ifsta->assocresp_ies)
		memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);

	ieee80211_set_associated(dev, ifsta, 1);

	/* Add STA entry for the AP */
	sta = sta_info_get(local, ifsta->bssid);
	if (!sta) {
		struct ieee80211_sta_bss *bss;
1390
		sta = sta_info_add(local, dev, ifsta->bssid, GFP_KERNEL);
1391
1392
1393
1394
1395
		if (!sta) {
			printk(KERN_DEBUG "%s: failed to add STA entry for the"
			       " AP\n", dev->name);
			return;
		}
1396
		bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
1397
1398
					   local->hw.conf.channel,
					   ifsta->ssid, ifsta->ssid_len);
1399
1400
1401
1402
1403
1404
1405
1406
1407
		if (bss) {
			sta->last_rssi = bss->rssi;
			sta->last_signal = bss->signal;
			sta->last_noise = bss->noise;
			ieee80211_rx_bss_put(dev, bss);
		}
	}

	sta->dev = dev;
1408
	sta->flags |= WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP;
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425

	rates = 0;
	mode = local->oper_hw_mode;
	for (i = 0; i < elems.supp_rates_len; i++) {
		int rate = (elems.supp_rates[i] & 0x7f) * 5;
		for (j = 0; j < mode->num_rates; j++)
			if (mode->rates[j].rate == rate)
				rates |= BIT(j);
	}
	for (i = 0; i < elems.ext_supp_rates_len; i++) {
		int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
		for (j = 0; j < mode->num_rates; j++)
			if (mode->rates[j].rate == rate)
				rates |= BIT(j);
	}
	sta->supp_rates = rates;

1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
	if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
	    local->ops->conf_ht) {
		struct ieee80211_ht_bss_info bss_info;

		ieee80211_ht_cap_ie_to_ht_info(
				(struct ieee80211_ht_cap *)
				elems.ht_cap_elem, &sta->ht_info);
		ieee80211_ht_addt_info_ie_to_ht_bss_info(
				(struct ieee80211_ht_addt_info *)
				elems.ht_info_elem, &bss_info);
		ieee80211_hw_config_ht(local, 1, &sta->ht_info, &bss_info);
	}

1439
1440
	rate_control_rate_init(sta, local);

1441
	if (elems.wmm_param && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
		sta->flags |= WLAN_STA_WME;
		ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
					 elems.wmm_param_len);
	}


	sta_info_put(sta);

	ieee80211_associated(dev, ifsta);
}


/* Caller must hold local->sta_bss_lock */
static void __ieee80211_rx_bss_hash_add(struct net_device *dev,
					struct ieee80211_sta_bss *bss)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	bss->hnext = local->sta_bss_hash[STA_HASH(bss->bssid)];
	local->sta_bss_hash[STA_HASH(bss->bssid)] = bss;
}


/* Caller must hold local->sta_bss_lock */
static void __ieee80211_rx_bss_hash_del(struct net_device *dev,
					struct ieee80211_sta_bss *bss)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sta_bss *b, *prev = NULL;
	b = local->sta_bss_hash[STA_HASH(bss->bssid)];
	while (b) {
		if (b == bss) {
			if (!prev)
				local->sta_bss_hash[STA_HASH(bss->bssid)] =
					bss->hnext;
			else
				prev->hnext = bss->hnext;
			break;
		}
		prev = b;
		b = b->hnext;
	}
}


static struct ieee80211_sta_bss *
1487
1488
ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int channel,
		     u8 *ssid, u8 ssid_len)
1489
1490
1491
1492
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sta_bss *bss;

1493
	bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
1494
1495
1496
1497
1498
	if (!bss)
		return NULL;
	atomic_inc(&bss->users);
	atomic_inc(&bss->users);
	memcpy(bss->bssid, bssid, ETH_ALEN);
1499
	bss->channel = channel;
1500
1501
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	if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
		memcpy(bss->ssid, ssid, ssid_len);
		bss->ssid_len = ssid_len;
	}
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	spin_lock_bh(&local->sta_bss_lock);
	/* TODO: order by RSSI? */
	list_add_tail(&bss->list, &local->sta_bss_list);
	__ieee80211_rx_bss_hash_add(dev, bss);
	spin_unlock_bh(&local->sta_bss_lock);
	return bss;
}


static struct ieee80211_sta_bss *
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ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel,
		     u8 *ssid, u8 ssid_len)
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{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sta_bss *bss;

	spin_lock_bh(&local->sta_bss_lock);
	bss = local->sta_bss_hash[STA_HASH(bssid)];
	while (bss) {
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		if (!memcmp(bss->bssid, bssid, ETH_ALEN) &&
		    bss->channel == channel &&
		    bss->ssid_len == ssid_len &&
		    (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
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			atomic_inc(&bss->users);
			break;
		}
		bss = bss->hnext;
	}
	spin_unlock_bh(&local->sta_bss_lock);
	return bss;
}


static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
{
	kfree(bss->wpa_ie);
	kfree(bss->rsn_ie);
	kfree(bss->wmm_ie);
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	kfree(bss->ht_ie);
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	kfree(bss);
}


static void ieee80211_rx_bss_put(struct net_device *dev,
				 struct ieee80211_sta_bss *bss)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	if (!atomic_dec_and_test(&bss->users))
		return;

	spin_lock_bh(&local->sta_bss_lock);
	__ieee80211_rx_bss_hash_del(dev, bss);
	list_del(&bss->list);
	spin_unlock_bh(&local->sta_bss_lock);
	ieee80211_rx_bss_free(bss);
}


void ieee80211_rx_bss_list_init(struct net_device *dev)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	spin_lock_init(&local->sta_bss_lock);
	INIT_LIST_HEAD(&local->sta_bss_list);
}


void ieee80211_rx_bss_list_deinit(struct net_device *dev)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sta_bss *bss, *tmp;

	list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
		ieee80211_rx_bss_put(dev, bss);
}


static void ieee80211_rx_bss_info(struct net_device *dev,
				  struct ieee80211_mgmt *mgmt,
				  size_t len,
				  struct ieee80211_rx_status *rx_status,
				  int beacon)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee802_11_elems elems;
	size_t baselen;
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	int channel, clen;
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	struct ieee80211_sta_bss *bss;
	struct sta_info *sta;
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	u64 timestamp;
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	DECLARE_MAC_BUF(mac);
	DECLARE_MAC_BUF(mac2);
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	if (!beacon && memcmp(mgmt->da, dev->dev_addr, ETH_ALEN))
		return; /* ignore ProbeResp to foreign address */

#if 0
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	printk(KERN_DEBUG "%s: RX %s from %s to %s\n",
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	       dev->name, beacon ? "Beacon" : "Probe Response",
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	       print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da));
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#endif

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

	timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);

	if (sdata->type == IEEE80211_IF_TYPE_IBSS && beacon &&
	    memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
#ifdef CONFIG_MAC80211_IBSS_DEBUG
		static unsigned long last_tsf_debug = 0;
		u64 tsf;
		if (local->ops->get_tsf)
			tsf = local->ops->get_tsf(local_to_hw(local));
		else
			tsf = -1LLU;
		if (time_after(jiffies, last_tsf_debug + 5 * HZ)) {
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			printk(KERN_DEBUG "RX beacon SA=%s BSSID="
			       "%s TSF=0x%llx BCN=0x%llx diff=%lld "
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			       "@%lu\n",
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			       print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->bssid),
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			       (unsigned long long)tsf,
			       (unsigned long long)timestamp,
			       (unsigned long long)(tsf - timestamp),
			       jiffies);
			last_tsf_debug = jiffies;
		}
#endif /* CONFIG_MAC80211_IBSS_DEBUG */
	}

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	ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
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	if (sdata->type == IEEE80211_IF_TYPE_IBSS && elems.supp_rates &&
	    memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0 &&
	    (sta = sta_info_get(local, mgmt->sa))) {
		struct ieee80211_hw_mode *mode;
		struct ieee80211_rate *rates;
		size_t num_rates;
		u32 supp_rates, prev_rates;
		int i, j;

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		mode = local->sta_sw_scanning ?
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		       local->scan_hw_mode : local->oper_hw_mode;
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		if (local->sta_hw_scanning) {
			/* search for the correct mode matches the beacon */
			list_for_each_entry(mode, &local->modes_list, list)
				if (mode->mode == rx_status->phymode)
					break;

			if (mode == NULL)
				mode = local->oper_hw_mode;
		}
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		rates = mode->rates;
		num_rates = mode->num_rates;

		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 (rates[j].rate == own_rate)
					supp_rates |= BIT(j);
		}

		prev_rates = sta->supp_rates;
		sta->supp_rates &= supp_rates;
		if (sta->supp_rates == 0) {
			/* No matching rates - this should not really happen.
			 * Make sure that at least one rate is marked
			 * supported to avoid issues with TX rate ctrl. */
			sta->supp_rates = sdata->u.sta.supp_rates_bits;
		}
		if (sta->supp_rates != prev_rates) {
			printk(KERN_DEBUG "%s: updated supp_rates set for "
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			       "%s based on beacon info (0x%x & 0x%x -> "
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			       "0x%x)\n",
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			       dev->name, print_mac(mac, sta->addr), prev_rates,
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			       supp_rates, sta->supp_rates);
		}
		sta_info_put(sta);
	}

	if (!elems.ssid)
		return;

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

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	bss = ieee80211_rx_bss_get(dev, mgmt->bssid, channel,
				   elems.ssid, elems.ssid_len);
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	if (!bss) {