mlme.c 127 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_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 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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#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 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 freq,
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		     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);
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static void sta_rx_agg_session_timer_expired(unsigned long data);
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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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		case WLAN_EID_MESH_ID:
			elems->mesh_id = pos;
			elems->mesh_id_len = elen;
			break;
		case WLAN_EID_MESH_CONFIG:
			elems->mesh_config = pos;
			elems->mesh_config_len = elen;
			break;
		case WLAN_EID_PEER_LINK:
			elems->peer_link = pos;
			elems->peer_link_len = elen;
			break;
		case WLAN_EID_PREQ:
			elems->preq = pos;
			elems->preq_len = elen;
			break;
		case WLAN_EID_PREP:
			elems->prep = pos;
			elems->prep_len = elen;
			break;
		case WLAN_EID_PERR:
			elems->perr = pos;
			elems->perr_len = elen;
			break;
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		case WLAN_EID_CHANNEL_SWITCH:
			elems->ch_switch_elem = pos;
			elems->ch_switch_elem_len = elen;
			break;
		case WLAN_EID_QUIET:
			if (!elems->quiet_elem) {
				elems->quiet_elem = pos;
				elems->quiet_elem_len = elen;
			}
			elems->num_of_quiet_elem++;
			break;
		case WLAN_EID_COUNTRY:
			elems->country_elem = pos;
			elems->country_elem_len = elen;
			break;
		case WLAN_EID_PWR_CONSTRAINT:
			elems->pwr_constr_elem = pos;
			elems->pwr_constr_elem_len = elen;
			break;
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		default:
			break;
		}

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


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 net_device *dev,
					 struct ieee80211_sta_bss *bss,
					 int ibss)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	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 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;

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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 = pos[2] | (pos[3] << 8);
#ifdef CONFIG_MAC80211_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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		       dev->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 "
			       "parameters for queue %d\n", dev->name, queue);
		}
	}
}

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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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	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
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	DECLARE_MAC_BUF(mac);
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	u32 changed = 0;
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	if (use_protection != bss_conf->use_cts_prot) {
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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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		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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		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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		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 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_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	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(dev, 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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			changed |= ieee80211_handle_bss_capability(sdata, bss);
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			ieee80211_rx_bss_put(dev, bss);
		}

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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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		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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		ieee80211_sta_tear_down_BA_sessions(dev, ifsta->bssid);
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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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		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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	wrqu.ap_addr.sa_family = ARPHRD_ETHER;
	wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
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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);
}

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void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
		      int encrypt)
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{
	struct ieee80211_sub_if_data *sdata;
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	struct ieee80211_tx_info *info;
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	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);

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	info = IEEE80211_SKB_CB(skb);
	memset(info, 0, sizeof(struct ieee80211_tx_info));
	info->control.ifindex = sdata->dev->ifindex;
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	if (!encrypt)
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		info->flags |= IEEE80211_TX_CTL_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);
}

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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;
}
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static void ieee80211_send_assoc(struct net_device *dev,
				 struct ieee80211_if_sta *ifsta)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u8 *pos, *ies;
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	int i, len, count, rates_len, supp_rates_len;
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	u16 capab;
	struct ieee80211_sta_bss *bss;
	int wmm = 0;
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	struct ieee80211_supported_band *sband;
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	u64 rates = 0;
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	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);

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

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

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

	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);

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

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	len = sband->n_bitrates;
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	pos = skb_put(skb, supp_rates_len + 2);
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	*pos++ = WLAN_EID_SUPP_RATES;
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	*pos++ = supp_rates_len;
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	count = 0;
	for (i = 0; i < sband->n_bitrates; i++) {
		if (BIT(i) & rates) {
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			int rate = sband->bitrates[i].bitrate;
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			*pos++ = (u8) (rate / 5);
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			if (++count == 8)
				break;
		}
	}

	if (count == 8) {
		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);
			}
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		}
	}

	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 */
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	if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
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	    sband->ht_info.ht_supported && bss->ht_add_ie) {
		struct ieee80211_ht_addt_info *ht_add_info =
			(struct ieee80211_ht_addt_info *)bss->ht_add_ie;
		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);
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		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);
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		/* 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);
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	}
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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->center_freq,
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				   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;

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	rcu_read_lock();

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	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));
1022
1023
1024
1025
1026
		disassoc = 1;
	} else {
		disassoc = 0;
		if (time_after(jiffies,
			       sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1027
			if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1028
				printk(KERN_DEBUG "%s: No ProbeResp from "
1029
				       "current AP %s - assume out of "
1030
				       "range\n",
1031
				       dev->name, print_mac(mac, ifsta->bssid));
1032
				disassoc = 1;
1033
				sta_info_unlink(&sta);
1034
			} else
1035
1036
1037
				ieee80211_send_probe_req(dev, ifsta->bssid,
							 local->scan_ssid,
							 local->scan_ssid_len);
1038
			ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1039
		} else {
1040
			ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1041
1042
1043
1044
1045
1046
1047
1048
1049
			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);
			}
		}
	}
1050
1051
1052

	rcu_read_unlock();

1053
	if (disassoc && sta)
1054
1055
		sta_info_destroy(sta);

1056
	if (disassoc) {
1057
1058
		ifsta->state = IEEE80211_DISABLED;
		ieee80211_set_associated(dev, ifsta, 0);
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
	} 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);
1070
	struct ieee80211_supported_band *sband;
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
	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;
1104
1105
1106
1107
	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];
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
		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]++;
		}
1120
		*pos = rate->bitrate / 5;
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
	}

	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 ||
1131
	    sdata->default_key->conf.alg != ALG_WEP)
1132
1133
1134
1135
1136
1137
1138
1139
1140
		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);
1141
	ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
	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;
1156
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1157
1158
1159
1160
1161
1162
1163
1164
1165
	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);
}

1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
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;

1177
1178
	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);

1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
	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);
1190
	if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
		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;
}

1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
void ieee80211_send_addba_request(struct net_device *dev, const u8 *da,
				u16 tid, u8 dialog_token, u16 start_seq_num,
				u16 agg_size, u16 timeout)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u16 capab;

1226
	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264

	if (!skb) {
		printk(KERN_ERR "%s: failed to allocate buffer "
				"for addba request 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->vif.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_req));

	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;

	mgmt->u.action.u.addba_req.dialog_token = dialog_token;
	capab = (u16)(1 << 1);		/* bit 1 aggregation policy */
	capab |= (u16)(tid << 2); 	/* bit 5:2 TID number */
	capab |= (u16)(agg_size << 6);	/* bit 15:6 max size of aggergation */

	mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);

	mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
	mgmt->u.action.u.addba_req.start_seq_num =
					cpu_to_le16(start_seq_num << 4);

	ieee80211_sta_tx(dev, skb, 0);
}

1265
1266
1267
1268
1269
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);
1270
1271
	struct ieee80211_hw *hw = &local->hw;
	struct ieee80211_conf *conf = &hw->conf;
1272
	struct sta_info *sta;
1273
1274
	struct tid_ampdu_rx *tid_agg_rx;
	u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
1275
	u8 dialog_token;
1276
1277
	int ret = -EOPNOTSUPP;
	DECLARE_MAC_BUF(mac);
1278

1279
1280
	rcu_read_lock();

1281
	sta = sta_info_get(local, mgmt->sa);
1282
1283
	if (!sta) {
		rcu_read_unlock();
1284
		return;
1285
	}
1286
1287
1288
1289

	/* 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);
1290
1291
	start_seq_num =
		le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
1292
1293
1294
1295
1296
1297
1298
1299

	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;

	status = WLAN_STATUS_REQUEST_DECLINED;

1300
1301
1302
1303
1304
1305
1306
1307
1308
	/* sanity check for incoming parameters:
	 * check if configuration can support the BA policy
	 * and if buffer size does not exceeds max value */
	if (((ba_policy != 1)
		&& (!(conf->ht_conf.cap & IEEE80211_HT_CAP_DELAY_BA)))
		|| (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
		status = WLAN_STATUS_INVALID_QOS_PARAM;
#ifdef CONFIG_MAC80211_HT_DEBUG
		if (net_ratelimit())
1309
			printk(KERN_DEBUG "AddBA Req with bad params from "
1310
1311
1312
1313
1314
1315
1316
1317
				"%s on tid %u. policy %d, buffer size %d\n",
				print_mac(mac, mgmt->sa), tid, ba_policy,
				buf_size);
#endif /* CONFIG_MAC80211_HT_DEBUG */
		goto end_no_lock;
	}
	/* determine default buffer size */
	if (buf_size == 0) {
1318
1319
1320
		struct ieee80211_supported_band *sband;

		sband = local->hw.wiphy->bands[conf->channel->band];
1321
		buf_size = IEEE80211_MIN_AMPDU_BUF;
1322
		buf_size = buf_size << sband->ht_info.ampdu_factor;
1323
1324
1325
1326
	}


	/* examine state machine */
1327
	spin_lock_bh(&sta->lock);
1328

1329
	if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
1330
1331
#ifdef CONFIG_MAC80211_HT_DEBUG
		if (net_ratelimit())
1332
			printk(KERN_DEBUG "unexpected AddBA Req from "
1333
1334
1335
1336
1337
1338
				"%s on tid %u\n",
				print_mac(mac, mgmt->sa), tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */
		goto end;
	}

1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
	/* prepare A-MPDU MLME for Rx aggregation */
	sta->ampdu_mlme.tid_rx[tid] =
			kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
	if (!sta->ampdu_mlme.tid_rx[tid]) {
		if (net_ratelimit())
			printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
					tid);
		goto end;
	}
	/* rx timer */
	sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
				sta_rx_agg_session_timer_expired;
	sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
				(unsigned long)&sta->timer_to_tid[tid];
	init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);

	tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];

1357
1358
	/* prepare reordering buffer */
	tid_agg_rx->reorder_buf =
1359
		kmalloc(buf_size * sizeof(struct sk_buff *), GFP_ATOMIC);
1360
1361
1362
1363
	if (!tid_agg_rx->reorder_buf) {
		if (net_ratelimit())
			printk(KERN_ERR "can not allocate reordering buffer "
			       "to tid %d\n", tid);
1364
		kfree(sta->ampdu_mlme.tid_rx[tid]);
1365
1366
1367
		goto end;
	}
	memset(tid_agg_rx->reorder_buf, 0,
1368
		buf_size * sizeof(struct sk_buff *));
1369
1370
1371

	if (local->ops->ampdu_action)
		ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
1372
					       sta->addr, tid, &start_seq_num);
1373
#ifdef CONFIG_MAC80211_HT_DEBUG
1374
	printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
1375
1376
1377
1378
#endif /* CONFIG_MAC80211_HT_DEBUG */

	if (ret) {
		kfree(tid_agg_rx->reorder_buf);
1379
1380
		kfree(tid_agg_rx);
		sta->ampdu_mlme.tid_rx[tid] = NULL;
1381
1382
1383
1384
		goto end;
	}

	/* change state and send addba resp */
1385
	sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
1386
1387
1388
1389
1390
1391
1392
1393
	tid_agg_rx->dialog_token = dialog_token;
	tid_agg_rx->ssn = start_seq_num;
	tid_agg_rx->head_seq_num = start_seq_num;
	tid_agg_rx->buf_size = buf_size;
	tid_agg_rx->timeout = timeout;
	tid_agg_rx->stored_mpdu_num = 0;
	status = WLAN_STATUS_SUCCESS;
end:
1394
	spin_unlock_bh(&sta->lock);
1395
1396

end_no_lock:
1397
1398
1399
	ieee80211_send_addba_resp(sta->sdata->dev, sta->addr, tid,
				  dialog_token, status, 1, buf_size, timeout);
	rcu_read_unlock();
1400
}
1401

1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
static void ieee80211_sta_process_addba_resp(struct net_device *dev,
					     struct ieee80211_mgmt *mgmt,
					     size_t len)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_hw *hw = &local->hw;
	struct sta_info *sta;
	u16 capab;
	u16 tid;
	u8 *state;

1413
1414
	rcu_read_lock();

1415
	sta = sta_info_get(local, mgmt->sa);
1416
1417
	if (!sta) {
		rcu_read_unlock();
1418
		return;
1419
	}
1420
1421
1422
1423

	capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
	tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;

1424
	state = &sta->ampdu_mlme.tid_state_tx[tid];
1425

1426
	spin_lock_bh(&sta->lock);
1427

1428
	if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1429
		spin_unlock_bh(&sta->lock);
1430
1431
1432
1433
1434
		printk(KERN_DEBUG "state not HT_ADDBA_REQUESTED_MSK:"
			"%d\n", *state);
		goto addba_resp_exit;
	}

1435
	if (mgmt->u.action.u.addba_resp.dialog_token !=
1436
		sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
1437
		spin_unlock_bh(&sta->lock);