/*-
 * Copyright (c) 2001 Atsushi Onoe
 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $Id$
 */
#ifndef EXPORT_SYMTAB
#define	EXPORT_SYMTAB
#endif

/*
 * IEEE 802.11 protocol support.
 */
#ifndef AUTOCONF_INCLUDED
#include <linux/config.h>
#endif
#include <linux/version.h>
#include <linux/kmod.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>

#include "if_media.h"

#include <net80211/ieee80211_var.h>

/* XXX tunables */
#define	AGGRESSIVE_MODE_SWITCH_HYSTERESIS	3	/* pkts / 100ms */
#define	HIGH_PRI_SWITCH_THRESH			10	/* pkts / 100ms */

#define	IEEE80211_RATE2MBS(r)	(((r) & IEEE80211_RATE_VAL) / 2)

const char *ieee80211_mgt_subtype_name[] = {
	"assoc_req",	"assoc_resp",	"reassoc_req",	"reassoc_resp",
	"probe_req",	"probe_resp",	"reserved#6",	"reserved#7",
	"beacon",	"atim",		"disassoc",	"auth",
	"deauth",	"reserved#13",	"reserved#14",	"reserved#15"
};
EXPORT_SYMBOL(ieee80211_mgt_subtype_name);
const char *ieee80211_ctl_subtype_name[] = {
	"reserved#0",	"reserved#1",	"reserved#2",	"reserved#3",
	"reserved#3",	"reserved#5",	"reserved#6",	"reserved#7",
	"reserved#8",	"reserved#9",	"ps_poll",	"rts",
	"cts",		"ack",		"cf_end",	"cf_end_ack"
};
EXPORT_SYMBOL(ieee80211_ctl_subtype_name);
const char *ieee80211_state_name[IEEE80211_S_MAX] = {
	"INIT",		/* IEEE80211_S_INIT */
	"SCAN",		/* IEEE80211_S_SCAN */
	"AUTH",		/* IEEE80211_S_AUTH */
	"ASSOC",	/* IEEE80211_S_ASSOC */
	"RUN"		/* IEEE80211_S_RUN */
};
EXPORT_SYMBOL(ieee80211_state_name);
const char *ieee80211_wme_acnames[] = {
	"WME_AC_BE",
	"WME_AC_BK",
	"WME_AC_VI",
	"WME_AC_VO",
	"WME_UPSD",
};
EXPORT_SYMBOL(ieee80211_wme_acnames);

static int ieee80211_newstate(struct ieee80211vap *, enum ieee80211_state, int);
static void ieee80211_tx_timeout(unsigned long);
#ifdef ATH_SUPERG_XR
static void ieee80211_start_xrvap(unsigned long);
#endif
void ieee80211_auth_setup(void);

void
ieee80211_proto_attach(struct ieee80211com *ic)
{

	ic->ic_protmode = IEEE80211_PROT_CTSONLY;

	ic->ic_wme.wme_hipri_switch_hysteresis =
		AGGRESSIVE_MODE_SWITCH_HYSTERESIS;

	/* initialize management frame handlers */
	ic->ic_recv_mgmt = ieee80211_recv_mgmt;
	ic->ic_send_mgmt = ieee80211_send_mgmt;

	ieee80211_auth_setup();
}

void
ieee80211_proto_detach(struct ieee80211com *ic)
{
}

void
ieee80211_proto_vattach(struct ieee80211vap *vap)
{
#ifdef notdef
	vap->iv_rtsthreshold = IEEE80211_RTS_DEFAULT;
#else
	vap->iv_rtsthreshold = IEEE80211_RTS_MAX;
#endif
	vap->iv_fragthreshold = 2346;		/* XXX not used yet */
	vap->iv_fixed_rate = IEEE80211_FIXED_RATE_NONE;
	init_timer(&vap->iv_mgtsend);
	init_timer(&vap->iv_xrvapstart);
	init_timer(&vap->iv_swbmiss);
	init_timer(&vap->iv_csa_timer);
	vap->iv_mgtsend.function = ieee80211_tx_timeout;
	vap->iv_mgtsend.data = (unsigned long) vap;

	/* protocol state change handler */
	vap->iv_newstate = ieee80211_newstate;
}

void
ieee80211_proto_vdetach(struct ieee80211vap *vap)
{
	/*
	 * This should not be needed as we detach when reseting
	 * the state but be conservative here since the
	 * authenticator may do things like spawn kernel threads.
	 */
	if (vap->iv_auth->ia_detach)
		vap->iv_auth->ia_detach(vap);

	/*
	 * Detach any ACL'ator.
	 */
	if (vap->iv_acl != NULL)
		vap->iv_acl->iac_detach(vap);
}

/*
 * Simple-minded authenticator module support.
 */

#define	IEEE80211_AUTH_MAX	(IEEE80211_AUTH_WPA+1)
/* XXX well-known names */
static const char *auth_modnames[IEEE80211_AUTH_MAX] = {
	"wlan_internal",	/* IEEE80211_AUTH_NONE */
	"wlan_internal",	/* IEEE80211_AUTH_OPEN */
	"wlan_internal",	/* IEEE80211_AUTH_SHARED */
	"wlan_xauth",		/* IEEE80211_AUTH_8021X	 */
	"wlan_internal",	/* IEEE80211_AUTH_AUTO */
	"wlan_xauth",		/* IEEE80211_AUTH_WPA */
};
static const struct ieee80211_authenticator *authenticators[IEEE80211_AUTH_MAX];

static const struct ieee80211_authenticator auth_internal = {
	.ia_name		= "wlan_internal",
	.ia_attach		= NULL,
	.ia_detach		= NULL,
	.ia_node_join		= NULL,
	.ia_node_leave		= NULL,
};

/*
 * Setup internal authenticators once; they are never unregistered.
 */
void
ieee80211_auth_setup(void)
{
	ieee80211_authenticator_register(IEEE80211_AUTH_OPEN, &auth_internal);
	ieee80211_authenticator_register(IEEE80211_AUTH_SHARED, &auth_internal);
	ieee80211_authenticator_register(IEEE80211_AUTH_AUTO, &auth_internal);
}

const struct ieee80211_authenticator *
ieee80211_authenticator_get(int auth)
{
	if (auth >= IEEE80211_AUTH_MAX)
		return NULL;
	if (authenticators[auth] == NULL)
		ieee80211_load_module(auth_modnames[auth]);
	return authenticators[auth];
}

void
ieee80211_authenticator_register(int type,
	const struct ieee80211_authenticator *auth)
{
	if (type >= IEEE80211_AUTH_MAX)
		return;
	authenticators[type] = auth;
}
EXPORT_SYMBOL(ieee80211_authenticator_register);

void
ieee80211_authenticator_unregister(int type)
{
	if (type >= IEEE80211_AUTH_MAX)
		return;
	authenticators[type] = NULL;
}
EXPORT_SYMBOL(ieee80211_authenticator_unregister);

/*
 * Very simple-minded authenticator backend module support.
 */
/* XXX just one for now */
static	const struct ieee80211_authenticator_backend *backend = NULL;

void
ieee80211_authenticator_backend_register(
	const struct ieee80211_authenticator_backend *be)
{
	printk(KERN_INFO "wlan: %s backend registered\n", be->iab_name);
	backend = be;
}
EXPORT_SYMBOL(ieee80211_authenticator_backend_register);

void
ieee80211_authenticator_backend_unregister(
	const struct ieee80211_authenticator_backend * be)
{
	if (backend == be)
		backend = NULL;
	printk(KERN_INFO "wlan: %s backend unregistered\n",
		be->iab_name);
}
EXPORT_SYMBOL(ieee80211_authenticator_backend_unregister);

const struct ieee80211_authenticator_backend *
ieee80211_authenticator_backend_get(const char *name)
{
	return backend && strcmp(backend->iab_name, name) == 0 ? backend : NULL;
}
EXPORT_SYMBOL(ieee80211_authenticator_backend_get);

/*
 * Very simple-minded ACL module support.
 */
/* XXX just one for now */
static const struct ieee80211_aclator *acl = NULL;

void
ieee80211_aclator_register(const struct ieee80211_aclator *iac)
{
	printk(KERN_INFO "wlan: %s acl policy registered\n", iac->iac_name);
	acl = iac;
}
EXPORT_SYMBOL(ieee80211_aclator_register);

void
ieee80211_aclator_unregister(const struct ieee80211_aclator *iac)
{
	if (acl == iac)
		acl = NULL;
	printk(KERN_INFO "wlan: %s acl policy unregistered\n", iac->iac_name);
}
EXPORT_SYMBOL(ieee80211_aclator_unregister);

const struct ieee80211_aclator *
ieee80211_aclator_get(const char *name)
{
	if (acl == NULL)
		ieee80211_load_module("wlan_acl");
	return acl && strcmp(acl->iac_name, name) == 0 ? acl : NULL;
}
EXPORT_SYMBOL(ieee80211_aclator_get);

#ifdef IEEE80211_DEBUG
void
ieee80211_print_essid(const u_int8_t *essid, int len)
{
	int i;
	const u_int8_t *p;

	if (len > IEEE80211_NWID_LEN)
		len = IEEE80211_NWID_LEN;
	/* determine printable or not */
	for (i = 0, p = essid; i < len; i++, p++) {
		if (*p < ' ' || *p > 0x7e)
			break;
	}
	if (i == len) {
		printf("\"");
		for (i = 0, p = essid; i < len; i++, p++)
			printf("%c", *p);
		printf("\"");
	} else {
		printf("0x");
		for (i = 0, p = essid; i < len; i++, p++)
			printf("%02x", *p);
	}
}
EXPORT_SYMBOL(ieee80211_print_essid);

void
ieee80211_dump_pkt(struct ieee80211com *ic,
	const u_int8_t *buf, int len, int rate, int rssi)
{
	const struct ieee80211_frame *wh;
	int i;

	wh = (const struct ieee80211_frame *)buf;
	switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
	case IEEE80211_FC1_DIR_NODS:
		printf("NODS %s", ether_sprintf(wh->i_addr2));
		printf("->%s", ether_sprintf(wh->i_addr1));
		printf("(%s)", ether_sprintf(wh->i_addr3));
		break;
	case IEEE80211_FC1_DIR_TODS:
		printf("TODS %s", ether_sprintf(wh->i_addr2));
		printf("->%s", ether_sprintf(wh->i_addr3));
		printf("(%s)", ether_sprintf(wh->i_addr1));
		break;
	case IEEE80211_FC1_DIR_FROMDS:
		printf("FRDS %s", ether_sprintf(wh->i_addr3));
		printf("->%s", ether_sprintf(wh->i_addr1));
		printf("(%s)", ether_sprintf(wh->i_addr2));
		break;
	case IEEE80211_FC1_DIR_DSTODS:
		printf("DSDS %s", ether_sprintf((u_int8_t *)&wh[1]));
		printf("->%s", ether_sprintf(wh->i_addr3));
		printf("(%s", ether_sprintf(wh->i_addr2));
		printf("->%s)", ether_sprintf(wh->i_addr1));
		break;
	}
	switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) {
	case IEEE80211_FC0_TYPE_DATA:
		printf(" data");
		break;
	case IEEE80211_FC0_TYPE_MGT:
		printf(" %s", ieee80211_mgt_subtype_name[
			(wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK)
			>> IEEE80211_FC0_SUBTYPE_SHIFT]);
		break;
	default:
		printf(" type#%d", wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK);
		break;
	}
	if (IEEE80211_QOS_HAS_SEQ(wh)) {
		const struct ieee80211_qosframe *qwh =
			(const struct ieee80211_qosframe *)buf;
		printf(" QoS [TID %u%s]", qwh->i_qos[0] & IEEE80211_QOS_TID,
			qwh->i_qos[0] & IEEE80211_QOS_ACKPOLICY ? " ACM" : "");
	}
	if (wh->i_fc[1] & IEEE80211_FC1_PROT) {
		int off;

		off = ieee80211_anyhdrspace(ic, wh);
		printf(" WEP [IV %.02x %.02x %.02x",
			buf[off+0], buf[off+1], buf[off+2]);
		if (buf[off+IEEE80211_WEP_IVLEN] & IEEE80211_WEP_EXTIV)
			printf(" %.02x %.02x %.02x",
				buf[off+4], buf[off+5], buf[off+6]);
		printf(" KID %u]", buf[off+IEEE80211_WEP_IVLEN] >> 6);
	}
	if (rate >= 0)
		printf(" %dM", rate / 2);
	if (rssi >= 0)
		printf(" +%d", rssi);
	printf("\n");
	if (len > 0) {
		for (i = 0; i < len; i++) {
			if ((i % 8) == 0)
				printf(" ");
			if ((i % 16) == 0)
				printf("\n");
			printf("%02x ", buf[i]);
		}
		printf("\n\n");
	}
}
EXPORT_SYMBOL(ieee80211_dump_pkt);
#endif

int
ieee80211_fix_rate(struct ieee80211_node *ni, int flags)
{
#define	RV(v)	((v) & IEEE80211_RATE_VAL)
	struct ieee80211vap *vap = ni->ni_vap;
	struct ieee80211com *ic = ni->ni_ic;
	int i, j, ignore, error;
	int okrate, badrate, fixedrate;
	struct ieee80211_rateset *srs, *nrs;
	u_int8_t r;

	error = 0;
	okrate = badrate = fixedrate = 0;
	srs = &ic->ic_sup_rates[ieee80211_chan2mode(ni->ni_chan)];
	nrs = &ni->ni_rates;
	fixedrate = IEEE80211_FIXED_RATE_NONE;
	for (i = 0; i < nrs->rs_nrates;) {
		ignore = 0;
		if (flags & IEEE80211_F_DOSORT) {
			/*
			 * Sort rates.
			 */
			for (j = i + 1; j < nrs->rs_nrates; j++) {
				if (RV(nrs->rs_rates[i]) > RV(nrs->rs_rates[j])) {
					r = nrs->rs_rates[i];
					nrs->rs_rates[i] = nrs->rs_rates[j];
					nrs->rs_rates[j] = r;
				}
			}
		}
		r = nrs->rs_rates[i] & IEEE80211_RATE_VAL;
		badrate = r;

		/*
		 * remove 0 rates
		 * they don't make sense and can lead to trouble later
		 */
		if (r == 0) {
			nrs->rs_nrates--;
			for (j = i; j < nrs->rs_nrates; j++)
				nrs->rs_rates[j] = nrs->rs_rates[j + 1];
			nrs->rs_rates[j] = 0;
			continue;
		}

		/*
		 * Check for fixed rate. 
		 */
		if (r == vap->iv_fixed_rate)
			fixedrate = r;
		if (flags & IEEE80211_F_DONEGO) {
			/*
			 * Check against supported rates.
			 */
			for (j = 0; j < srs->rs_nrates; j++) {
				if (r == RV(srs->rs_rates[j])) {
					/*
					 * Overwrite with the supported rate
					 * value so any basic rate bit is set.
					 * This ensures that response we send
					 * to stations have the necessary basic
					 * rate bit set.
					 */
					nrs->rs_rates[i] = srs->rs_rates[j];
					break;
				}
			}
			if (j == srs->rs_nrates) {
				/*
				 * A rate in the node's rate set is not
				 * supported.  If this is a basic rate and we
				 * are operating as an AP then this is an error.
				 * Otherwise we just discard/ignore the rate.
				 * Note that this is important for 11b stations
				 * when they want to associate with an 11g AP.
				 */
				if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
				    (nrs->rs_rates[i] & IEEE80211_RATE_BASIC))
					error++;
				ignore++;
			}
		}
		if (flags & IEEE80211_F_DODEL) {
			/*
			 * Delete unacceptable rates.
			 */
			if (ignore) {
				nrs->rs_nrates--;
				for (j = i; j < nrs->rs_nrates; j++)
					nrs->rs_rates[j] = nrs->rs_rates[j + 1];
				nrs->rs_rates[j] = 0;
				continue;
			}
		}
		if (!ignore)
			okrate = nrs->rs_rates[i];
		i++;
	}
	if (okrate == 0 || error != 0 ||
	    ((flags & IEEE80211_F_DOFRATE) && fixedrate != vap->iv_fixed_rate))
		return badrate | IEEE80211_RATE_BASIC;
	else
		return RV(okrate);
#undef RV
}

/*
 * Reset 11g-related state.
 */
void
ieee80211_reset_erp(struct ieee80211com *ic, enum ieee80211_phymode mode)
{
#define	IS_11G(m) \
	((m) == IEEE80211_MODE_11G || (m) == IEEE80211_MODE_TURBO_G)

	ic->ic_flags &= ~IEEE80211_F_USEPROT;
	/*
	 * Preserve the long slot and nonerp station count if
	 * switching between 11g and turboG. Otherwise, inactivity
	 * will cause the turbo station to disassociate and possibly
	 * try to leave the network.
	 * XXX not right if really trying to reset state
	 */
	if (IS_11G(mode) ^ IS_11G(ic->ic_curmode)) {
		ic->ic_nonerpsta = 0;
		ic->ic_longslotsta = 0;
	}

	/*
	 * Short slot time is enabled only when operating in 11g
	 * and not in an IBSS.  We must also honor whether or not
	 * the driver is capable of doing it.
	 */
	ieee80211_set_shortslottime(ic,
		IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
		(IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
		ic->ic_opmode == IEEE80211_M_HOSTAP &&
		(ic->ic_caps & IEEE80211_C_SHSLOT)));
	/*
	 * Set short preamble and ERP barker-preamble flags.
	 */
	if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
	    (ic->ic_caps & IEEE80211_C_SHPREAMBLE)) {
		ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
		ic->ic_flags &= ~IEEE80211_F_USEBARKER;
	} else {
		ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
		ic->ic_flags |= IEEE80211_F_USEBARKER;
	}
#undef IS_11G
}

/*
 * Set the short slot time state and notify the driver.
 */
void
ieee80211_set_shortslottime(struct ieee80211com *ic, int onoff)
{
	if (onoff)
		ic->ic_flags |= IEEE80211_F_SHSLOT;
	else
		ic->ic_flags &= ~IEEE80211_F_SHSLOT;
	/* notify driver */
	if (ic->ic_updateslot != NULL)
		ic->ic_updateslot(ic->ic_dev);
}

/*
 * Check if the specified rate set supports ERP.
 * NB: the rate set is assumed to be sorted.
 */
int
ieee80211_iserp_rateset(struct ieee80211com *ic, struct ieee80211_rateset *rs)
{
	static const int rates[] = { 2, 4, 11, 22, 12, 24, 48 };
	int i, j;

	if (rs->rs_nrates < ARRAY_SIZE(rates))
		return 0;
	for (i = 0; i < ARRAY_SIZE(rates); i++) {
		for (j = 0; j < rs->rs_nrates; j++) {
			int r = rs->rs_rates[j] & IEEE80211_RATE_VAL;
			if (rates[i] == r)
				goto next;
			if (r > rates[i])
				return 0;
		}
		return 0;
	next:
		;
	}
	return 1;
}

static const struct ieee80211_rateset basic11g[IEEE80211_MODE_MAX] = {
	{ 0 },			/* IEEE80211_MODE_AUTO */
	{ 3, { 12, 24, 48 } },	/* IEEE80211_MODE_11A */
	{ 2, { 2, 4 } },		/* IEEE80211_MODE_11B */
	{ 4, { 2, 4, 11, 22 } },	/* IEEE80211_MODE_11G (mixed b/g) */
	{ 0 },			/* IEEE80211_MODE_FH */
	{ 3, { 12, 24, 48 } },	/* IEEE80211_MODE_TURBO_A */
	{ 4, { 2, 4, 11, 22 } },	/* IEEE80211_MODE_TURBO_G (mixed b/g) */
};

/*
 * Mark the basic rates for the 11g rate table based on the
 * specified mode.  For 11b compatibility we mark only 11b
 * rates.  There's also a pseudo 11a-mode used to mark only
 * the basic OFDM rates; this is used to exclude 11b stations
 * from an 11g bss.
 */
void
ieee80211_set11gbasicrates(struct ieee80211_rateset *rs, enum ieee80211_phymode mode)
{
	int i, j;

	KASSERT(mode < IEEE80211_MODE_MAX, ("invalid mode %u", mode));
	for (i = 0; i < rs->rs_nrates; i++) {
		rs->rs_rates[i] &= IEEE80211_RATE_VAL;
		for (j = 0; j < basic11g[mode].rs_nrates; j++)
			if (basic11g[mode].rs_rates[j] == rs->rs_rates[i]) {
				rs->rs_rates[i] |= IEEE80211_RATE_BASIC;
				break;
			}
	}
}

/*
 * Deduce the 11g setup by examining the rates
 * that are marked basic.
 */
enum ieee80211_phymode
ieee80211_get11gbasicrates(struct ieee80211_rateset *rs)
{
	struct ieee80211_rateset basic;
	int i;

	memset(&basic, 0, sizeof(basic));
	for (i = 0; i < rs->rs_nrates; i++)
		if (rs->rs_rates[i] & IEEE80211_RATE_BASIC)
			basic.rs_rates[basic.rs_nrates++] =
				rs->rs_rates[i] & IEEE80211_RATE_VAL;
	for (i = 0; i < IEEE80211_MODE_MAX; i++)
		if (memcmp(&basic, &basic11g[i], sizeof(basic)) == 0)
			return i;
	return IEEE80211_MODE_AUTO;
}

void
ieee80211_wme_initparams(struct ieee80211vap *vap)
{
	struct ieee80211com *ic = vap->iv_ic;

	IEEE80211_LOCK_IRQ(ic);
	ieee80211_wme_initparams_locked(vap);
	IEEE80211_UNLOCK_IRQ(ic);
}

void
ieee80211_wme_initparams_locked(struct ieee80211vap *vap)
{
	struct ieee80211com *ic = vap->iv_ic;
	struct ieee80211_wme_state *wme = &ic->ic_wme;
	struct phyParamType {
		u_int8_t aifsn;
		u_int8_t logcwmin;
		u_int8_t logcwmax;
		u_int16_t txopLimit;
		u_int8_t acm;
	};
	enum ieee80211_phymode mode;

	struct phyParamType *pPhyParam, *pBssPhyParam;

	static struct phyParamType phyParamForAC_BE[IEEE80211_MODE_MAX] = {
		/* IEEE80211_MODE_AUTO  */ { 3, 4,  6,   0, 0 },
		/* IEEE80211_MODE_11A   */ { 3, 4,  6,   0, 0 },
		/* IEEE80211_MODE_11B   */ { 3, 5,  7,   0, 0 },
		/* IEEE80211_MODE_11G   */ { 3, 4,  6,   0, 0 },
		/* IEEE80211_MODE_FH    */ { 3, 5,  7,   0, 0 },
		/* IEEE80211_MODE_TURBO */ { 2, 3,  5,   0, 0 },
		/* IEEE80211_MODE_TURBO */ { 2, 3,  5,   0, 0 }};
	static struct phyParamType phyParamForAC_BK[IEEE80211_MODE_MAX] = {
		/* IEEE80211_MODE_AUTO  */ { 7, 4, 10,   0, 0 },
		/* IEEE80211_MODE_11A   */ { 7, 4, 10,   0, 0 },
		/* IEEE80211_MODE_11B   */ { 7, 5, 10,   0, 0 },
		/* IEEE80211_MODE_11G   */ { 7, 4, 10,   0, 0 },
		/* IEEE80211_MODE_FH    */ { 7, 5, 10,   0, 0 },
		/* IEEE80211_MODE_TURBO */ { 7, 3, 10,   0, 0 },
		/* IEEE80211_MODE_TURBO */ { 7, 3, 10,   0, 0 }};
	static struct phyParamType phyParamForAC_VI[IEEE80211_MODE_MAX] = {
		/* IEEE80211_MODE_AUTO  */ { 1, 3,  4,  94, 0 },
		/* IEEE80211_MODE_11A   */ { 1, 3,  4,  94, 0 },
		/* IEEE80211_MODE_11B   */ { 1, 4,  5, 188, 0 },
		/* IEEE80211_MODE_11G   */ { 1, 3,  4,  94, 0 },
		/* IEEE80211_MODE_FH    */ { 1, 4,  5, 188, 0 },
		/* IEEE80211_MODE_TURBO */ { 1, 2,  3,  94, 0 },
		/* IEEE80211_MODE_TURBO */ { 1, 2,  3,  94, 0 }};
	static struct phyParamType phyParamForAC_VO[IEEE80211_MODE_MAX] = {
		/* IEEE80211_MODE_AUTO  */ { 1, 2,  3,  47, 0 },
		/* IEEE80211_MODE_11A   */ { 1, 2,  3,  47, 0 },
		/* IEEE80211_MODE_11B   */ { 1, 3,  4, 102, 0 },
		/* IEEE80211_MODE_11G   */ { 1, 2,  3,  47, 0 },
		/* IEEE80211_MODE_FH    */ { 1, 3,  4, 102, 0 },
		/* IEEE80211_MODE_TURBO */ { 1, 2,  2,  47, 0 },
		/* IEEE80211_MODE_TURBO */ { 1, 2,  2,  47, 0 }};

	static struct phyParamType bssPhyParamForAC_BE[IEEE80211_MODE_MAX] = {
		/* IEEE80211_MODE_AUTO  */ { 3, 4, 10,   0, 0 },
		/* IEEE80211_MODE_11A   */ { 3, 4, 10,   0, 0 },
		/* IEEE80211_MODE_11B   */ { 3, 5, 10,   0, 0 },
		/* IEEE80211_MODE_11G   */ { 3, 4, 10,   0, 0 },
		/* IEEE80211_MODE_FH    */ { 3, 5, 10,   0, 0 },
		/* IEEE80211_MODE_TURBO */ { 2, 3, 10,   0, 0 },
		/* IEEE80211_MODE_TURBO */ { 2, 3, 10,   0, 0 }};
	static struct phyParamType bssPhyParamForAC_VI[IEEE80211_MODE_MAX] = {
		/* IEEE80211_MODE_AUTO  */ { 2, 3,  4,  94, 0 },
		/* IEEE80211_MODE_11A   */ { 2, 3,  4,  94, 0 },
		/* IEEE80211_MODE_11B   */ { 2, 4,  5, 188, 0 },
		/* IEEE80211_MODE_11G   */ { 2, 3,  4,  94, 0 },
		/* IEEE80211_MODE_FH    */ { 2, 4,  5, 188, 0 },
		/* IEEE80211_MODE_TURBO */ { 2, 2,  3,  94, 0 },
		/* IEEE80211_MODE_TURBO */ { 2, 2,  3,  94, 0 }};
	static struct phyParamType bssPhyParamForAC_VO[IEEE80211_MODE_MAX] = {
		/* IEEE80211_MODE_AUTO  */ { 2, 2,  3,  47, 0 },
		/* IEEE80211_MODE_11A   */ { 2, 2,  3,  47, 0 },
		/* IEEE80211_MODE_11B   */ { 2, 3,  4, 102, 0 },
		/* IEEE80211_MODE_11G   */ { 2, 2,  3,  47, 0 },
		/* IEEE80211_MODE_FH    */ { 2, 3,  4, 102, 0 },
		/* IEEE80211_MODE_TURBO */ { 1, 2,  2,  47, 0 },
		/* IEEE80211_MODE_TURBO */ { 1, 2,  2,  47, 0 }};

	int i;

	IEEE80211_LOCK_ASSERT(ic);

	if ((ic->ic_caps & IEEE80211_C_WME) == 0)
		return;
	/*
	 * Select mode; we can be called early in which case we
	 * always use auto mode.  We know we'll be called when
	 * entering the RUN state with bsschan setup properly
	 * so state will eventually get set correctly
	 */
	if (ic->ic_bsschan != IEEE80211_CHAN_ANYC)
		mode = ieee80211_chan2mode(ic->ic_bsschan);
	else
		mode = IEEE80211_MODE_AUTO;
	for (i = 0; i < WME_NUM_AC; i++) {
		switch (i) {
		case WME_AC_BK:
			pPhyParam = &phyParamForAC_BK[mode];
			pBssPhyParam = &phyParamForAC_BK[mode];
			break;
		case WME_AC_VI:
			pPhyParam = &phyParamForAC_VI[mode];
			pBssPhyParam = &bssPhyParamForAC_VI[mode];
			break;
		case WME_AC_VO:
			pPhyParam = &phyParamForAC_VO[mode];
			pBssPhyParam = &bssPhyParamForAC_VO[mode];
			break;
		case WME_AC_BE:
		default:
			pPhyParam = &phyParamForAC_BE[mode];
			pBssPhyParam = &bssPhyParamForAC_BE[mode];
			break;
		}

		if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
			wme->wme_wmeChanParams.cap_wmeParams[i].wmep_acm =
				pPhyParam->acm;
			wme->wme_wmeChanParams.cap_wmeParams[i].wmep_aifsn =
				pPhyParam->aifsn;
			wme->wme_wmeChanParams.cap_wmeParams[i].wmep_logcwmin =
				pPhyParam->logcwmin;
			wme->wme_wmeChanParams.cap_wmeParams[i].wmep_logcwmax =
				pPhyParam->logcwmax;
			wme->wme_wmeChanParams.cap_wmeParams[i].wmep_txopLimit =
				pPhyParam->txopLimit;
		} else {
			wme->wme_wmeChanParams.cap_wmeParams[i].wmep_acm =
				pBssPhyParam->acm;
			wme->wme_wmeChanParams.cap_wmeParams[i].wmep_aifsn =
				pBssPhyParam->aifsn;
			wme->wme_wmeChanParams.cap_wmeParams[i].wmep_logcwmin =
				pBssPhyParam->logcwmin;
			wme->wme_wmeChanParams.cap_wmeParams[i].wmep_logcwmax =
				pBssPhyParam->logcwmax;
			wme->wme_wmeChanParams.cap_wmeParams[i].wmep_txopLimit =
				pBssPhyParam->txopLimit;
		}
		wme->wme_wmeBssChanParams.cap_wmeParams[i].wmep_acm =
			pBssPhyParam->acm;
		wme->wme_wmeBssChanParams.cap_wmeParams[i].wmep_aifsn =
			pBssPhyParam->aifsn;
		wme->wme_wmeBssChanParams.cap_wmeParams[i].wmep_logcwmin =
			pBssPhyParam->logcwmin;
		wme->wme_wmeBssChanParams.cap_wmeParams[i].wmep_logcwmax =
			pBssPhyParam->logcwmax;
		wme->wme_wmeBssChanParams.cap_wmeParams[i].wmep_txopLimit =
			pBssPhyParam->txopLimit;
	}
	/* NB: check ic_bss to avoid NULL deref on initial attach */
	if (vap->iv_bss != NULL) {
		/*
		 * Calculate aggressive mode switching threshold based
		 * on beacon interval.
		 */
		wme->wme_hipri_switch_thresh =
			(HIGH_PRI_SWITCH_THRESH * vap->iv_bss->ni_intval) / 100;
		ieee80211_wme_updateparams_locked(vap);
	}
}

/*
 * Update WME parameters for ourself and the BSS.
 */
void
ieee80211_wme_updateparams_locked(struct ieee80211vap *vap)
{
	static const struct { u_int8_t aifsn; u_int8_t logcwmin; u_int8_t logcwmax; u_int16_t txopLimit;}
	phyParam[IEEE80211_MODE_MAX] = {
	      /* IEEE80211_MODE_AUTO  */ { 2, 4, 10, 64 },
	      /* IEEE80211_MODE_11A   */ { 2, 4, 10, 64 },
	      /* IEEE80211_MODE_11B   */ { 2, 5, 10, 64 },
	      /* IEEE80211_MODE_11G   */ { 2, 4, 10, 64 },
	      /* IEEE80211_MODE_FH    */ { 2, 5, 10, 64 },
	      /* IEEE80211_MODE_TURBO */ { 1, 3, 10, 64 }};
	struct ieee80211com *ic = vap->iv_ic;
	struct ieee80211_wme_state *wme = &ic->ic_wme;
	enum ieee80211_phymode mode;
	int i;

	IEEE80211_LOCK_ASSERT(vap->iv_ic);

	/* set up the channel access parameters for the physical device */

	for (i = 0; i < WME_NUM_AC; i++) {
		wme->wme_chanParams.cap_wmeParams[i].wmep_aifsn =
			wme->wme_wmeChanParams.cap_wmeParams[i].wmep_aifsn;
		wme->wme_chanParams.cap_wmeParams[i].wmep_logcwmin =
			wme->wme_wmeChanParams.cap_wmeParams[i].wmep_logcwmin;
		wme->wme_chanParams.cap_wmeParams[i].wmep_logcwmax =
			wme->wme_wmeChanParams.cap_wmeParams[i].wmep_logcwmax;
		wme->wme_chanParams.cap_wmeParams[i].wmep_txopLimit =
			wme->wme_wmeChanParams.cap_wmeParams[i].wmep_txopLimit;
		wme->wme_bssChanParams.cap_wmeParams[i].wmep_aifsn =
			wme->wme_wmeBssChanParams.cap_wmeParams[i].wmep_aifsn;
		wme->wme_bssChanParams.cap_wmeParams[i].wmep_logcwmin =
			wme->wme_wmeBssChanParams.cap_wmeParams[i].wmep_logcwmin;
		wme->wme_bssChanParams.cap_wmeParams[i].wmep_logcwmax =
			wme->wme_wmeBssChanParams.cap_wmeParams[i].wmep_logcwmax;
		wme->wme_bssChanParams.cap_wmeParams[i].wmep_txopLimit =
			wme->wme_wmeBssChanParams.cap_wmeParams[i].wmep_txopLimit;
	}

	/*
	 * Select mode; we can be called early in which case we
	 * always use auto mode.  We know we'll be called when
	 * entering the RUN state with bsschan setup properly
	 * so state will eventually get set correctly
	 */
	if (ic->ic_bsschan != IEEE80211_CHAN_ANYC)
		mode = ieee80211_chan2mode(ic->ic_bsschan);
	else
		mode = IEEE80211_MODE_AUTO;
	    if ((vap->iv_opmode == IEEE80211_M_HOSTAP &&
	     (wme->wme_flags & WME_F_AGGRMODE) != 0) ||
	    (vap->iv_opmode != IEEE80211_M_HOSTAP &&
	     (vap->iv_bss->ni_flags & IEEE80211_NODE_QOS) == 0) ||
	    (vap->iv_flags & IEEE80211_F_WME) == 0) {
		struct ieee80211vap *tmpvap;
		u_int8_t burstEnabled = 0;
		/* check if bursting  enabled on at least one vap */
		TAILQ_FOREACH(tmpvap, &ic->ic_vaps, iv_next) {
			if (tmpvap->iv_ath_cap & IEEE80211_ATHC_BURST) {
				burstEnabled = 1;
				break;
			}
		}
		wme->wme_chanParams.cap_wmeParams[WME_AC_BE].wmep_aifsn =
			phyParam[mode].aifsn;
		wme->wme_chanParams.cap_wmeParams[WME_AC_BE].wmep_logcwmin =
			phyParam[mode].logcwmin;
		wme->wme_chanParams.cap_wmeParams[WME_AC_BE].wmep_logcwmax =
			phyParam[mode].logcwmax;
		wme->wme_chanParams.cap_wmeParams[WME_AC_BE].wmep_txopLimit =
			burstEnabled ? phyParam[mode].txopLimit : 0;
		wme->wme_bssChanParams.cap_wmeParams[WME_AC_BE].wmep_aifsn =
			phyParam[mode].aifsn;
		wme->wme_bssChanParams.cap_wmeParams[WME_AC_BE].wmep_logcwmin =
			phyParam[mode].logcwmin;
		wme->wme_bssChanParams.cap_wmeParams[WME_AC_BE].wmep_logcwmax =
			phyParam[mode].logcwmax;
		wme->wme_bssChanParams.cap_wmeParams[WME_AC_BE].wmep_txopLimit =
			burstEnabled ? phyParam[mode].txopLimit : 0;
	}

	if (ic->ic_opmode == IEEE80211_M_HOSTAP &&
	    ic->ic_sta_assoc < 2 && (wme->wme_flags & WME_F_AGGRMODE) != 0) {
		static const u_int8_t logCwMin[IEEE80211_MODE_MAX] = {
			/* IEEE80211_MODE_AUTO  */   3,
			/* IEEE80211_MODE_11A   */   3,
			/* IEEE80211_MODE_11B   */   4,
			/* IEEE80211_MODE_11G   */   3,
			/* IEEE80211_MODE_FH    */   4,
			/* IEEE80211_MODE_TURBO_A */ 3,
			/* IEEE80211_MODE_TURBO_G */ 3
		};

		wme->wme_chanParams.cap_wmeParams[WME_AC_BE].wmep_logcwmin =
			wme->wme_bssChanParams.cap_wmeParams[WME_AC_BE].wmep_logcwmin =
			logCwMin[mode];
	}
	if (vap->iv_opmode == IEEE80211_M_HOSTAP) {	/* XXX ibss? */
		/*
		 * Arrange for a beacon update and bump the parameter
		 * set number so associated stations load the new values.
		 */
		wme->wme_bssChanParams.cap_info_count =
			(wme->wme_bssChanParams.cap_info_count + 1) & WME_QOSINFO_COUNT;
		vap->iv_flags |= IEEE80211_F_WMEUPDATE;
	}

	wme->wme_update(ic);

	IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
		"%s: WME params updated, cap_info 0x%x\n", __func__,
		vap->iv_opmode == IEEE80211_M_STA ?
			wme->wme_wmeChanParams.cap_info_count :
			wme->wme_bssChanParams.cap_info_count);
}

EXPORT_SYMBOL(ieee80211_wme_updateparams);

void
ieee80211_wme_updateparams(struct ieee80211vap *vap)
{
	struct ieee80211com *ic = vap->iv_ic;

	if (ic->ic_caps & IEEE80211_C_WME) {
		IEEE80211_LOCK_IRQ(ic);
		ieee80211_wme_updateparams_locked(vap);
		IEEE80211_UNLOCK_IRQ(ic);
	}
}

/*
 * Start a vap.  If this is the first vap running on the
 * underlying device then we first bring it up.
 */
int
ieee80211_init(struct net_device *dev, int forcescan)
{
#define	IS_RUNNING(_dev) \
	((_dev->flags & (IFF_RUNNING|IFF_UP)) == (IFF_RUNNING|IFF_UP))
	struct ieee80211vap *vap = dev->priv;
	struct ieee80211com *ic = vap->iv_ic;
	struct net_device *parent = ic->ic_dev;

	IEEE80211_DPRINTF(vap,
		IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
		"start running (state=%d)\n", vap->iv_state);


	if ((dev->flags & IFF_RUNNING) == 0) {
		if (ic->ic_nopened++ == 0 &&
		    (parent->flags & IFF_RUNNING) == 0)
			dev_open(parent);
		/*
		 * Mark us running.  Note that we do this after
		 * opening the parent device to avoid recursion.
		 */
		dev->flags |= IFF_RUNNING;		/* mark us running */
	}
	/*
	 * If the parent is up and running, then kick the
	 * 802.11 state machine as appropriate.
	 * XXX parent should always be up+running
	 */
	if (IS_RUNNING(ic->ic_dev) &&
	    ic->ic_roaming != IEEE80211_ROAMING_MANUAL) {
		if (vap->iv_opmode == IEEE80211_M_STA) {
			/*
			 * Try to be intelligent about clocking the state
			 * machine.  If we're currently in RUN state then
			 * we should be able to apply any new state/parameters
			 * simply by re-associating.  Otherwise we need to
			 * re-scan to select an appropriate ap.
			 */
			if (vap->iv_state != IEEE80211_S_RUN || forcescan)
				ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
			else
				ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
		} else {
			/*
			 * When the old state is running the vap must 
			 * be brought to init.
			 */
			if (vap->iv_state == IEEE80211_S_RUN)
				ieee80211_new_state(vap, IEEE80211_S_INIT, -1);
			/*
			 * For monitor+wds modes there's nothing to do but
			 * start running.  Otherwise, if this is the first
			 * vap to be brought up, start a scan which may be
			 * preempted if the station is locked to a particular
			 * channel.
			 */
			if (vap->iv_opmode == IEEE80211_M_MONITOR ||
			    vap->iv_opmode == IEEE80211_M_WDS) {
				ieee80211_new_state(vap, IEEE80211_S_RUN, -1);
			} else
				ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
		}
	}
	return 0;
#undef IS_RUNNING
}

int
ieee80211_open(struct net_device *dev)
{
	return ieee80211_init(dev, 0);
}

/*
 * Start all runnable VAPs on a device.
 */
void
ieee80211_start_running(struct ieee80211com *ic)
{
	struct ieee80211vap *vap;
	struct net_device *dev;

	/* XXX locking */
	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
		dev = vap->iv_dev;
		if ((dev->flags & IFF_UP) && !(dev->flags & IFF_RUNNING))	/* NB: avoid recursion */
			ieee80211_open(dev);
	}
}
EXPORT_SYMBOL(ieee80211_start_running);

/*
 * Stop a vap.  We force it down using the state machine
 * then mark its device not running.  If this is the last
 * vap running on the underlying device then we close it
 * too to ensure it will be properly initialized when the
 * next vap is brought up.
 */
int
ieee80211_stop(struct net_device *dev)
{
	struct ieee80211vap *vap = dev->priv;
	struct ieee80211com *ic = vap->iv_ic;
	struct net_device *parent = ic->ic_dev;

	IEEE80211_DPRINTF(vap,
		IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
		"%s\n", "stop running");

	ieee80211_new_state(vap, IEEE80211_S_INIT, -1);
	if (dev->flags & IFF_RUNNING) {
		dev->flags &= ~IFF_RUNNING;		/* mark us stopped */
		del_timer(&vap->iv_mgtsend);
		if (--ic->ic_nopened == 0 && (parent->flags & IFF_RUNNING))
			dev_close(parent);
	}
#ifdef ATH_SUPERG_XR
	/*
	 * also stop the XR vap. 
	 */
	if (vap->iv_xrvap && !(vap->iv_flags & IEEE80211_F_XR)) {
		ieee80211_stop(vap->iv_xrvap->iv_dev);
		del_timer(&vap->iv_xrvapstart);
		vap->iv_xrvap->iv_dev->flags = dev->flags;
	}
#endif
	return 0;
}
EXPORT_SYMBOL(ieee80211_stop);

/*
 * Stop all VAPs running on a device.
 */
void
ieee80211_stop_running(struct ieee80211com *ic)
{
	struct ieee80211vap *vap;
	struct net_device *dev;

	/* XXX locking */
	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
		dev = vap->iv_dev;
		if (dev->flags & IFF_RUNNING)	/* NB: avoid recursion */
			ieee80211_stop(dev);
	}
}
EXPORT_SYMBOL(ieee80211_stop_running);

#ifdef ATH_SUPERG_DYNTURBO
/*
 * Switch between turbo and non-turbo operating modes.
 * Use the specified channel flags to locate the new
 * channel, update 802.11 state, and then call back into
 * the driver to effect the change.
 */
void
ieee80211_dturbo_switch(struct ieee80211com *ic, int newflags)
{
#ifdef IEEE80211_DEBUG
	/* XXX use first vap for debug flags */
	struct ieee80211vap *vap = TAILQ_FIRST(&ic->ic_vaps);
#endif
	struct ieee80211_channel *chan;

	chan = ieee80211_find_channel(ic, ic->ic_bsschan->ic_freq, newflags);
	if (chan == NULL) {		/* XXX should not happen */
		IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPG,
			"%s: no channel with freq %u flags 0x%x\n",
			__func__, ic->ic_bsschan->ic_freq, newflags);
		return;
	}

	IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPG,
		"%s: %s -> %s (freq %u flags 0x%x)\n", __func__,
		ieee80211_phymode_name[ieee80211_chan2mode(ic->ic_bsschan)],
		ieee80211_phymode_name[ieee80211_chan2mode(chan)],
		chan->ic_freq, chan->ic_flags);

	ic->ic_bsschan = chan;
	ic->ic_curchan = chan;
	ic->ic_set_channel(ic);
	/* NB: do not need to reset ERP state because in sta mode */
}
EXPORT_SYMBOL(ieee80211_dturbo_switch);
#endif /* ATH_SUPERG_DYNTURBO */

void
ieee80211_beacon_miss(struct ieee80211com *ic)
{
	struct ieee80211vap *vap;

	if (ic->ic_flags & IEEE80211_F_SCAN) {
		/* XXX check ic_curchan != ic_bsschan? */
		return;
	}
	/* XXX locking */
	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
		IEEE80211_DPRINTF(vap,
			IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
			"%s\n", "beacon miss");

		/*
		 * Our handling is only meaningful for stations that are
		 * associated; any other conditions else will be handled
		 * through different means (e.g. the tx timeout on mgt frames).
		 */
		if (vap->iv_opmode != IEEE80211_M_STA ||
		    vap->iv_state != IEEE80211_S_RUN)
			continue;
		if (ic->ic_roaming == IEEE80211_ROAMING_AUTO) {
#ifdef ATH_SUPERG_DYNTURBO
			/* 
			 * If we receive a beacon miss interrupt when using
			 * dynamic turbo, attempt to switch modes before
			 * reassociating.
			 */
			if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_ATHC_TURBOP))
				ieee80211_dturbo_switch(ic,
					ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
#endif /* ATH_SUPERG_DYNTURBO */
			/*
			 * Try to reassociate before scanning for a new ap.
			 */
			ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
		} else {
			/*
			 * Somebody else is controlling state changes (e.g.
			 * a user-mode app) don't do anything that would
			 * confuse them; just drop into scan mode so they'll
			 * notified of the state change and given control.
			 */
			ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
		}
	}
}
EXPORT_SYMBOL(ieee80211_beacon_miss);

/*
 * STA software beacon timer callback. This is called
 * only when we have a series beacon misses.
 */
static void
ieee80211_sta_swbmiss(unsigned long arg)
{
	struct ieee80211vap *vap = (struct ieee80211vap *) arg;
	ieee80211_beacon_miss(vap->iv_ic);
}

/*
 * Per-ieee80211vap watchdog timer callback.  This
 * is used only to timeout the xmit of management frames.
 */
static void
ieee80211_tx_timeout(unsigned long arg)
{
	struct ieee80211vap *vap = (struct ieee80211vap *) arg;

	IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
		"%s: state %s%s\n", __func__,
		ieee80211_state_name[vap->iv_state],
		vap->iv_ic->ic_flags & IEEE80211_F_SCAN ? ", scan active" : "");

	if (vap->iv_state != IEEE80211_S_INIT &&
	    (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) {
		/*
		 * NB: it's safe to specify a timeout as the reason here;
		 *     it'll only be used in the right state.
		 */
		ieee80211_new_state(vap, IEEE80211_S_SCAN,
			IEEE80211_SCAN_FAIL_TIMEOUT);
	}
}

static void
sta_disassoc(void *arg, struct ieee80211_node *ni)
{
	struct ieee80211vap *vap = arg;

	if (ni->ni_vap == vap && ni->ni_associd != 0) {
		IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
			IEEE80211_REASON_ASSOC_LEAVE);
		ieee80211_node_leave(ni);
	}
}

static void
sta_deauth(void *arg, struct ieee80211_node *ni)
{
	struct ieee80211vap *vap = arg;

	if (ni->ni_vap == vap)
		IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
			IEEE80211_REASON_ASSOC_LEAVE);
}

/*
 * Context: softIRQ (tasklet) and process
 */
int
ieee80211_new_state(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
{
	struct ieee80211com *ic = vap->iv_ic;
	int rc;

	/* grab the lock so that only one vap can go through transition at any time */
	IEEE80211_VAPS_LOCK_BH(ic);
	rc = vap->iv_newstate(vap, nstate, arg);
	IEEE80211_VAPS_UNLOCK_BH(ic);
	return rc;
}

static int
__ieee80211_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
{
	struct ieee80211com *ic = vap->iv_ic;
	struct ieee80211_node *ni;
	enum ieee80211_state ostate;

	ostate = vap->iv_state;
	IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
		ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
	vap->iv_state = nstate;			/* state transition */
	del_timer(&vap->iv_mgtsend);
	if ((vap->iv_opmode != IEEE80211_M_HOSTAP) && 
			(ostate != IEEE80211_S_SCAN))
		ieee80211_cancel_scan(vap);	/* background scan */
	ni = vap->iv_bss;			/* NB: no reference held */
	switch (nstate) {
	case IEEE80211_S_INIT:
		switch (ostate) {
		case IEEE80211_S_INIT:
			break;
		case IEEE80211_S_RUN:
			switch (vap->iv_opmode) {
			case IEEE80211_M_STA:
				IEEE80211_SEND_MGMT(ni,
					IEEE80211_FC0_SUBTYPE_DISASSOC,
					IEEE80211_REASON_ASSOC_LEAVE);
				ieee80211_sta_leave(ni);
				break;
			case IEEE80211_M_HOSTAP:
				ieee80211_iterate_nodes(&ic->ic_sta,
					sta_disassoc, vap);
				break;
			default:
				break;
			}
			goto reset;
		case IEEE80211_S_ASSOC:
			switch (vap->iv_opmode) {
			case IEEE80211_M_STA:
				IEEE80211_SEND_MGMT(ni,
					IEEE80211_FC0_SUBTYPE_DEAUTH,
					IEEE80211_REASON_AUTH_LEAVE);
				break;
			case IEEE80211_M_HOSTAP:
				ieee80211_iterate_nodes(&ic->ic_sta,
					sta_deauth, vap);
				break;
			default:
				break;
			}
			goto reset;
		case IEEE80211_S_SCAN:
			ieee80211_cancel_scan(vap);
			goto reset;
		case IEEE80211_S_AUTH:
		reset:
			ieee80211_reset_bss(vap);
			break;
		}
		if (vap->iv_auth->ia_detach != NULL)
			vap->iv_auth->ia_detach(vap);
		break;
	case IEEE80211_S_SCAN:
		switch (ostate) {
		case IEEE80211_S_INIT:
		createibss:
			if ((vap->iv_opmode == IEEE80211_M_HOSTAP ||
			     vap->iv_opmode == IEEE80211_M_IBSS ||
			     vap->iv_opmode == IEEE80211_M_AHDEMO) &&
			    vap->iv_des_chan != IEEE80211_CHAN_ANYC) {
				/*
				 * AP operation and we already have a channel;
				 * bypass the scan and startup immediately.
				 */
				ieee80211_create_ibss(vap, vap->iv_des_chan);
			} else {
				ieee80211_check_scan(vap,
					IEEE80211_SCAN_ACTIVE |
					IEEE80211_SCAN_FLUSH,
					IEEE80211_SCAN_FOREVER,
					vap->iv_des_nssid, vap->iv_des_ssid,
					NULL);
			}
			break;
		case IEEE80211_S_SCAN:
		case IEEE80211_S_AUTH:
		case IEEE80211_S_ASSOC:
			/*
			 * These can happen either because of a timeout
			 * on an assoc/auth response or because of a
			 * change in state that requires a reset.  For
			 * the former we're called with a non-zero arg
			 * that is the cause for the failure; pass this
			 * to the scan code so it can update state.
			 * Otherwise trigger a new scan unless we're in
			 * manual roaming mode in which case an application
			 * must issue an explicit scan request.
			 */
			if (arg != 0)
				ieee80211_scan_assoc_fail(ic,
					vap->iv_bss->ni_macaddr, arg);
			if (ic->ic_roaming == IEEE80211_ROAMING_AUTO)
				ieee80211_check_scan(vap,
					IEEE80211_SCAN_ACTIVE,
					IEEE80211_SCAN_FOREVER,
					vap->iv_des_nssid, vap->iv_des_ssid,
					NULL);
			break;
		case IEEE80211_S_RUN:		/* beacon miss */
			if (vap->iv_opmode == IEEE80211_M_STA) {
				ieee80211_sta_leave(ni);
				vap->iv_flags &= ~IEEE80211_F_SIBSS;	/* XXX */
				if (ic->ic_roaming == IEEE80211_ROAMING_AUTO)
					ieee80211_check_scan(vap,
						IEEE80211_SCAN_ACTIVE,
						IEEE80211_SCAN_FOREVER,
						vap->iv_des_nssid,
						vap->iv_des_ssid,
						NULL);
			} else {
				ieee80211_iterate_nodes(&ic->ic_sta,
					sta_disassoc, vap);
				goto createibss;
			}
			break;
		}
		break;
	case IEEE80211_S_AUTH:
		/* auth frames are possible between IBSS nodes, see 802.11-1999, chapter 5.7.6 */
		KASSERT(vap->iv_opmode == IEEE80211_M_STA || vap->iv_opmode == IEEE80211_M_IBSS,
			("switch to %s state when operating in mode %u",
			 ieee80211_state_name[nstate], vap->iv_opmode));
		switch (ostate) {
		case IEEE80211_S_INIT:
		case IEEE80211_S_SCAN:
			IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
			break;
		case IEEE80211_S_AUTH:
		case IEEE80211_S_ASSOC:
			switch (arg) {
			case IEEE80211_FC0_SUBTYPE_AUTH:
				/* ??? */
				IEEE80211_SEND_MGMT(ni,
					IEEE80211_FC0_SUBTYPE_AUTH, 2);
				break;
			case IEEE80211_FC0_SUBTYPE_DEAUTH:
				IEEE80211_SEND_MGMT(ni,
					IEEE80211_FC0_SUBTYPE_AUTH, 1);
				break;
			}
			break;
		case IEEE80211_S_RUN:
			switch (arg) {
			case IEEE80211_FC0_SUBTYPE_AUTH:
				IEEE80211_SEND_MGMT(ni,
					IEEE80211_FC0_SUBTYPE_AUTH, 2);
				vap->iv_state = ostate;	/* stay RUN */
				break;
			case IEEE80211_FC0_SUBTYPE_DEAUTH:
				ieee80211_sta_leave(ni);
				if (ic->ic_roaming == IEEE80211_ROAMING_AUTO) {
					/* try to reauth */
					IEEE80211_SEND_MGMT(ni,
						IEEE80211_FC0_SUBTYPE_AUTH, 1);
				}
				break;
			}
			break;
		}
		break;
	case IEEE80211_S_ASSOC:
		KASSERT(vap->iv_opmode == IEEE80211_M_STA,
			("switch to %s state when operating in mode %u",
			 ieee80211_state_name[nstate], vap->iv_opmode));
		switch (ostate) {
		case IEEE80211_S_INIT:
		case IEEE80211_S_SCAN:
			IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY,
				"%s: invalid transition\n", __func__);
			break;
		case IEEE80211_S_AUTH:
		case IEEE80211_S_ASSOC:
			IEEE80211_SEND_MGMT(ni,
				IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
			break;
		case IEEE80211_S_RUN:
			ieee80211_sta_leave(ni);
			if (ic->ic_roaming == IEEE80211_ROAMING_AUTO) {
				/* NB: caller specifies ASSOC/REASSOC by arg */
				IEEE80211_SEND_MGMT(ni, arg ?
					IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
					IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
			}
			break;
		}
		break;
	case IEEE80211_S_RUN:
		if (vap->iv_flags & IEEE80211_F_WPA) {
			/* XXX validate prerequisites */
		}

		switch (ostate) {
		case IEEE80211_S_INIT:
			if (vap->iv_opmode == IEEE80211_M_MONITOR ||
			    vap->iv_opmode == IEEE80211_M_WDS ||
			    vap->iv_opmode == IEEE80211_M_HOSTAP) {
				/*
				 * Already have a channel; bypass the
				 * scan and startup immediately.
				 */
				ieee80211_create_ibss(vap, ic->ic_curchan);

				/* In WDS mode, allocate and initialize peer node. */
				if (vap->iv_opmode == IEEE80211_M_WDS) {
					/* XXX: This is horribly non-atomic. */
					struct ieee80211_node *wds_ni =
						ieee80211_find_node(&ic->ic_sta,
								vap->wds_mac);

					if (wds_ni == NULL) {
						wds_ni = ieee80211_alloc_node_table(
								vap,
								vap->wds_mac);
						if (wds_ni != NULL)
							ieee80211_add_wds_addr(
									&ic->ic_sta,
									wds_ni,
									vap->wds_mac,
									1);
						else
							IEEE80211_DPRINTF(
									vap,
									IEEE80211_MSG_NODE,
									"%s: Unable to "
									"allocate node for "
									"WDS: %s\n",
									__func__,
									ether_sprintf(
										vap->wds_mac)
									);
					}

					if (wds_ni != NULL) {
						ieee80211_node_authorize(wds_ni);
						wds_ni->ni_chan =
							vap->iv_bss->ni_chan;
						wds_ni->ni_capinfo =
							ni->ni_capinfo;
						wds_ni->ni_associd = 1;
						wds_ni->ni_ath_flags =
							vap->iv_ath_cap;
					}
				}
				break;
			}
			/* fall thru... */
		case IEEE80211_S_AUTH:
			IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY,
				"%s: invalid transition\n", __func__);
			break;
		case IEEE80211_S_RUN:
			break;
		case IEEE80211_S_SCAN:		/* adhoc/hostap mode */
		case IEEE80211_S_ASSOC:		/* infra mode */
			KASSERT(ni->ni_txrate < ni->ni_rates.rs_nrates,
				("%s: bogus xmit rate %u setup\n", __func__,
				ni->ni_txrate));
#ifdef IEEE80211_DEBUG
			if (ieee80211_msg_debug(vap)) {
				ieee80211_note(vap, "%s with %s ssid ",
					(vap->iv_opmode == IEEE80211_M_STA ?
					"associated" : "synchronized "),
					ether_sprintf(ni->ni_bssid));
				ieee80211_print_essid(vap->iv_bss->ni_essid,
					ni->ni_esslen);
				printf(" channel %d start %uMb\n",
					ieee80211_chan2ieee(ic, ic->ic_curchan),
					IEEE80211_RATE2MBS(ni->ni_rates.rs_rates[ni->ni_txrate]));
			}
#endif
			if (vap->iv_opmode == IEEE80211_M_STA) {
				ieee80211_scan_assoc_success(ic,
					ni->ni_macaddr);
				ieee80211_notify_node_join(ni,
					(arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP) | \
					(arg == IEEE80211_FC0_SUBTYPE_REASSOC_RESP));
			}
			break;
		}

		/* WDS/Repeater: Start software beacon timer for STA */
		if (ostate != IEEE80211_S_RUN &&
		    (vap->iv_opmode == IEEE80211_M_STA &&
		     vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) {
			vap->iv_swbmiss.function = ieee80211_sta_swbmiss;
			vap->iv_swbmiss.data = (unsigned long) vap;
			vap->iv_swbmiss_period = IEEE80211_TU_TO_JIFFIES(
				IEEE80211_SWBMISS_THRESHOLD * ni->ni_intval);

			mod_timer(&vap->iv_swbmiss, jiffies + vap->iv_swbmiss_period);
		}

		/*
		 * Start/stop the authenticator when operating as an
		 * AP.  We delay until here to allow configuration to
		 * happen out of order.
		 */
		/* XXX WDS? */
		if (vap->iv_opmode == IEEE80211_M_HOSTAP && /* XXX IBSS/AHDEMO */
		    vap->iv_auth->ia_attach != NULL) {
			/* XXX check failure */
			vap->iv_auth->ia_attach(vap);
		} else if (vap->iv_auth->ia_detach != NULL)
			vap->iv_auth->ia_detach(vap);
		/*
		 * When 802.1x is not in use mark the port authorized
		 * at this point so traffic can flow.
		 */
		if (ni->ni_authmode != IEEE80211_AUTH_8021X)
			ieee80211_node_authorize(ni);
#ifdef ATH_SUPERG_XR
		/*
		 * fire a timer to bring up XR vap if configured.
		 */
		if (ostate != IEEE80211_S_RUN &&
		    vap->iv_xrvap &&
		    !(vap->iv_flags & IEEE80211_F_XR)) {
			vap->iv_xrvapstart.function = ieee80211_start_xrvap;
			vap->iv_xrvapstart.data = (unsigned long) vap->iv_xrvap;
			mod_timer(&vap->iv_xrvapstart, jiffies + HZ); /* start xr vap on next second */
			/* 
			 * do not let the normal vap automatically bring up XR vap.
			 * let the timer handler start the XR vap. if you let the
			 * normal vap automatically start the XR vap  normal vap will not
			 * have the bssid initialized and the XR vap will use the
			 * invalid bssid in XRIE of its beacon.
			 */
			if (vap->iv_xrvap->iv_flags_ext & IEEE80211_FEXT_SCAN_PENDING)
				vap->iv_xrvap->iv_flags_ext &= ~IEEE80211_FEXT_SCAN_PENDING;
		}
		/*
		 * when an XR vap transitions to RUN state,
		 * normal vap needs to update the XR IE
		 * with the xr vaps MAC address.
		 */
		if (vap->iv_flags & IEEE80211_F_XR)
			vap->iv_xrvap->iv_flags |= IEEE80211_F_XRUPDATE;
#endif
		break;
	}
	return 0;
}

static int
ieee80211_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
{
	struct ieee80211com *ic = vap->iv_ic;
	enum ieee80211_state ostate;
	struct ieee80211vap *tmpvap;

	ostate = vap->iv_state;
	switch (nstate) {
	case IEEE80211_S_SCAN:
		if (ostate == IEEE80211_S_INIT) {
			int nrunning, nscanning;

			nrunning = nscanning = 0;
			TAILQ_FOREACH(tmpvap, &ic->ic_vaps, iv_next) {
				if (vap != tmpvap) {
					if (tmpvap->iv_opmode == IEEE80211_M_MONITOR)
						/* skip monitor vaps as their
						 * S_RUN shouldn't have any
						 * influence on modifying state
						 * transition */
						continue;
					if (tmpvap->iv_state == IEEE80211_S_RUN)
						nrunning++;
					else if (tmpvap->iv_state == IEEE80211_S_SCAN ||
					    tmpvap->iv_state == IEEE80211_S_AUTH || /* STA in WDS/Repeater */
					    tmpvap->iv_state == IEEE80211_S_ASSOC)
						nscanning++;
				}
			}

			KASSERT(!(nscanning && nrunning), ("SCAN and RUN can't happen at the same time\n"));

			if (!nscanning && !nrunning) {
				/* when no one is running or scanning, start a new scan */
				__ieee80211_newstate(vap, nstate, arg);
			} else if (!nscanning && nrunning) {
				/* when no one is scanning but someone is running, bypass
				 * scan and go to run state immediately */
				if (vap->iv_opmode == IEEE80211_M_MONITOR ||
				    vap->iv_opmode == IEEE80211_M_WDS ||
				    vap->iv_opmode == IEEE80211_M_HOSTAP) {
					__ieee80211_newstate(vap, IEEE80211_S_RUN, arg);
				} else {
					/* MW: avoid invalid S_INIT -> S_RUN transition */
					__ieee80211_newstate(vap, nstate, arg);
				}
			} else if (nscanning && !nrunning) {
				/* when someone is scanning and no one is running, set
				 * the scan pending flag. Don't go through state machine */
				IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
					"%s: %s -> %s with SCAN_PENDING\n",
					__func__,
					ieee80211_state_name[ostate],
					ieee80211_state_name[nstate]);
				vap->iv_flags_ext |= IEEE80211_FEXT_SCAN_PENDING;
			}
		} else {
			/* the VAP is forced to scan, we need to change all other VAPs state
			 * to INIT and pend for the scan completion */
			TAILQ_FOREACH(tmpvap, &ic->ic_vaps, iv_next) {
				if (vap != tmpvap && tmpvap->iv_state != IEEE80211_S_INIT) {
					tmpvap->iv_newstate(tmpvap, IEEE80211_S_INIT, 0);
					tmpvap->iv_flags_ext |= IEEE80211_FEXT_SCAN_PENDING;
				}
			}

			/* start the new scan */
			__ieee80211_newstate(vap, nstate, arg);
		}
		break;

	case IEEE80211_S_RUN:
		if ((ostate == IEEE80211_S_SCAN) ||		/* AP coming out of scan */
		    (vap->iv_opmode == IEEE80211_M_STA)) {	/* STA in WDS/Repeater needs to bring up other VAPs  */
			__ieee80211_newstate(vap, nstate, arg);

			/* bring up all other vaps pending on the scan */
			TAILQ_FOREACH(tmpvap, &ic->ic_vaps, iv_next) {
				if (vap != tmpvap) {
					if (tmpvap->iv_flags_ext & IEEE80211_FEXT_SCAN_PENDING) {
						tmpvap->iv_flags_ext &= ~IEEE80211_FEXT_SCAN_PENDING;
						tmpvap->iv_newstate(tmpvap, IEEE80211_S_RUN, 0);
					}
				}
			}
		} else
			__ieee80211_newstate(vap, nstate, arg);
		break;

	case IEEE80211_S_INIT:
		if (ostate == IEEE80211_S_INIT)
			vap->iv_flags_ext &= ~IEEE80211_FEXT_SCAN_PENDING;
		/* fall through */

	default:
		__ieee80211_newstate(vap, nstate, arg);
	}
	return 0;
}

#ifdef ATH_SUPERG_XR
/*
 * start the XR vap .
 * called from a timer when normal vap enters RUN state .
 */
static void
ieee80211_start_xrvap(unsigned long data)
{
	struct ieee80211vap *vap = (struct ieee80211vap *)data;
	/* make sure that the normal vap is still in RUN state */
	if (vap->iv_xrvap->iv_state == IEEE80211_S_RUN)
		ieee80211_init(vap->iv_dev, 0);
}

#endif