NetBSD/sys/dev/ic/an.c

/*	$NetBSD: an.c,v 1.22 2002/03/23 03:40:24 gmcgarry Exp $	*/
/*
 * Copyright (c) 1997, 1998, 1999
 *	Bill Paul <wpaul@ctr.columbia.edu>.  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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Bill Paul.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``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 Bill Paul OR THE VOICES IN HIS HEAD
 * 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.
 *
 * $FreeBSD: src/sys/dev/an/if_an.c,v 1.12 2000/11/13 23:04:12 wpaul Exp $
 */

/*
 * Aironet 4500/4800 802.11 PCMCIA/ISA/PCI driver for FreeBSD.
 *
 * Written by Bill Paul <wpaul@ctr.columbia.edu>
 * Electrical Engineering Department
 * Columbia University, New York City
 */

/*
 * The Aironet 4500/4800 series cards some in PCMCIA, ISA and PCI form.
 * This driver supports all three device types (PCI devices are supported
 * through an extra PCI shim: /sys/pci/if_an_p.c). ISA devices can be
 * supported either using hard-coded IO port/IRQ settings or via Plug
 * and Play. The 4500 series devices support 1Mbps and 2Mbps data rates.
 * The 4800 devices support 1, 2, 5.5 and 11Mbps rates.
 *
 * Like the WaveLAN/IEEE cards, the Aironet NICs are all essentially
 * PCMCIA devices. The ISA and PCI cards are a combination of a PCMCIA
 * device and a PCMCIA to ISA or PCMCIA to PCI adapter card. There are
 * a couple of important differences though:
 *
 * - Lucent doesn't currently offer a PCI card, however Aironet does
 * - Lucent ISA card looks to the host like a PCMCIA controller with
 *   a PCMCIA WaveLAN card inserted. This means that even desktop
 *   machines need to be configured with PCMCIA support in order to
 *   use WaveLAN/IEEE ISA cards. The Aironet cards on the other hand
 *   actually look like normal ISA and PCI devices to the host, so
 *   no PCMCIA controller support is needed
 *
 * The latter point results in a small gotcha. The Aironet PCMCIA
 * cards can be configured for one of two operating modes depending
 * on how the Vpp1 and Vpp2 programming voltages are set when the
 * card is activated. In order to put the card in proper PCMCIA
 * operation (where the CIS table is visible and the interface is
 * programmed for PCMCIA operation), both Vpp1 and Vpp2 have to be
 * set to 5 volts. FreeBSD by default doesn't set the Vpp voltages,
 * which leaves the card in ISA/PCI mode, which prevents it from
 * being activated as an PCMCIA device. Consequently, /sys/pccard/pccard.c
 * has to be patched slightly in order to enable the Vpp voltages in
 * order to make the Aironet PCMCIA cards work.
 *
 * Note that some PCMCIA controller software packages for Windows NT
 * fail to set the voltages as well.
 * 
 * The Aironet devices can operate in both station mode and access point
 * mode. Typically, when programmed for station mode, the card can be set
 * to automatically perform encapsulation/decapsulation of Ethernet II
 * and 802.3 frames within 802.11 frames so that the host doesn't have
 * to do it itself. This driver doesn't program the card that way: the
 * driver handles all of the encapsulation/decapsulation itself.
 */

/*
 * Ported to NetBSD from FreeBSD by Atsushi Onoe at the San Diego
 * IETF meeting.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: an.c,v 1.22 2002/03/23 03:40:24 gmcgarry Exp $");

#include "opt_inet.h"
#include "bpfilter.h"

#ifdef INET
/*
 * It is designed for IPv4 only.
 * no one use it and disabled for now. -- onoe
 */
#undef ANCACHE			/* enable signal strength cache */
#endif

#include <sys/param.h>
#include <sys/callout.h>
#include <sys/systm.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/ucred.h>
#include <sys/socket.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/md4.h>
#ifdef ANCACHE
#include <sys/syslog.h>
#include <sys/sysctl.h>
#endif

#include <machine/bus.h>

#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_ether.h>
#include <net/if_ieee80211.h>
#include <net/if_types.h>
#include <net/if_media.h>

#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#endif

#if NBPFILTER > 0
#include <net/bpf.h>
#endif

#include <dev/ic/anreg.h>
#include <dev/ic/anvar.h>

/* These are global because we need them in sys/pci/if_an_p.c. */
static void an_reset		__P((struct an_softc *));
static void an_wait		__P((struct an_softc *));
static int an_ioctl		__P((struct ifnet *, u_long, caddr_t));
static int an_set_nwkey		__P((struct an_softc *,
					struct ieee80211_nwkey *));
static int an_set_nwkey_wep	__P((struct an_softc *,
					struct ieee80211_nwkey *));
static int an_set_nwkey_eap	__P((struct an_softc *,
					struct ieee80211_nwkey *));
static int an_get_nwkey		__P((struct an_softc *,
					struct ieee80211_nwkey *));
static int an_write_wepkey	__P((struct an_softc *sc, int type,
					struct an_wepkey *keys, int kid));
static int an_init		__P((struct ifnet *));
static void an_stop		__P((struct ifnet *, int));
static int an_init_tx_ring	__P((struct an_softc *));
static void an_start		__P((struct ifnet *));
static void an_watchdog		__P((struct ifnet *));
static void an_rxeof		__P((struct an_softc *));
static void an_txeof		__P((struct an_softc *, int));

static int an_cmd		__P((struct an_softc *, int, int));
static int an_read_record	__P((struct an_softc *, struct an_ltv_gen *));
static int an_write_record	__P((struct an_softc *, struct an_ltv_gen *));
static int an_read_data		__P((struct an_softc *, int,
					int, caddr_t, int));
static int an_write_data	__P((struct an_softc *, int,
					int, caddr_t, int));
static int an_seek		__P((struct an_softc *, int, int, int));
static int an_alloc_nicmem	__P((struct an_softc *, int, int *));
static void an_stats_update	__P((void *));
static int an_setdef		__P((struct an_softc *, struct an_req *));
#ifdef ANCACHE
static void an_cache_store	__P((struct an_softc *, struct ether_header *,
					struct mbuf *, unsigned short));
#endif
#ifdef IFM_IEEE80211
static int an_media_change __P((struct ifnet *ifp));
static void an_media_status __P((struct ifnet *ifp, struct ifmediareq *imr));
#endif

int
an_attach(struct an_softc *sc)
{
	struct ifnet *ifp = &sc->arpcom.ec_if;
	int i, s;
	struct an_ltv_wepkey *akey;
#ifdef IFM_IEEE80211
	int mtype;
	struct ifmediareq imr;
#endif

	s = splnet();
	sc->an_associated = 0;
	an_wait(sc);

	/* Load factory config */
	if (an_cmd(sc, AN_CMD_READCFG, 0)) {
		splx(s);
		printf("%s: failed to load config data\n", sc->an_dev.dv_xname);
		return(EIO);
	}

	/* Read the current configuration */
	sc->an_config.an_type = AN_RID_GENCONFIG;
	sc->an_config.an_len = sizeof(struct an_ltv_genconfig);
	if (an_read_record(sc, (struct an_ltv_gen *)&sc->an_config)) {
		splx(s);
		printf("%s: read record failed\n", sc->an_dev.dv_xname);
		return(EIO);
	}

	/* Read the card capabilities */
	sc->an_caps.an_type = AN_RID_CAPABILITIES;
	sc->an_caps.an_len = sizeof(struct an_ltv_caps);
	if (an_read_record(sc, (struct an_ltv_gen *)&sc->an_caps)) {
		splx(s);
		printf("%s: read record failed\n", sc->an_dev.dv_xname);
		return(EIO);
	}

	/* Read ssid list */
	sc->an_ssidlist.an_type = AN_RID_SSIDLIST;
	sc->an_ssidlist.an_len = sizeof(struct an_ltv_ssidlist);
	if (an_read_record(sc, (struct an_ltv_gen *)&sc->an_ssidlist)) {
		splx(s);
		printf("%s: read record failed\n", sc->an_dev.dv_xname);
		return(EIO);
	}

	/* Read AP list */
	sc->an_aplist.an_type = AN_RID_APLIST;
	sc->an_aplist.an_len = sizeof(struct an_ltv_aplist);
	if (an_read_record(sc, (struct an_ltv_gen *)&sc->an_aplist)) {
		splx(s);
		printf("%s: read record failed\n", sc->an_dev.dv_xname);
		return(EIO);
	}

	/* Read WEP settings from persistent memory */
	akey = (struct an_ltv_wepkey *)&sc->an_reqbuf;
	akey->an_type = AN_RID_WEP_VOLATILE;
	akey->an_len = sizeof(struct an_ltv_wepkey);
	while (an_read_record(sc, (struct an_ltv_gen *)akey) == 0) {
		if (akey->an_key_index == 0xffff) {
			sc->an_tx_perskey = akey->an_mac_addr[0];
			sc->an_tx_key = -1;
			break;
		}
		if (akey->an_key_index >= IEEE80211_WEP_NKID)
			break;
		sc->an_perskeylen[akey->an_key_index] = akey->an_key_len;
		sc->an_wepkeys[akey->an_key_index].an_wep_keylen = -1;
		akey->an_type = AN_RID_WEP_PERSISTENT;	/* for next key */
		akey->an_len = sizeof(*akey);
	}
	/* XXX not sure if persistent key settings should be printed here */

	printf("%s: 802.11 address: %s\n", sc->an_dev.dv_xname,
	    ether_sprintf(sc->an_caps.an_oemaddr));

	ifp->if_softc = sc;
	ifp->if_flags = IFF_BROADCAST | IFF_NOTRAILERS | IFF_SIMPLEX |
	    IFF_MULTICAST | IFF_ALLMULTI;
	ifp->if_ioctl = an_ioctl;
	ifp->if_start = an_start;
	ifp->if_init = an_init;
	ifp->if_stop = an_stop;
	ifp->if_watchdog = an_watchdog;
	IFQ_SET_READY(&ifp->if_snd);

	memcpy(ifp->if_xname, sc->an_dev.dv_xname, IFNAMSIZ);

	memset(sc->an_config.an_nodename, 0, sizeof(sc->an_config.an_nodename));
	memcpy(sc->an_config.an_nodename, AN_DEFAULT_NODENAME,
	    sizeof(AN_DEFAULT_NODENAME) - 1);

	memset(sc->an_ssidlist.an_ssid1, 0, sizeof(sc->an_ssidlist.an_ssid1));
	memcpy(sc->an_ssidlist.an_ssid1, AN_DEFAULT_NETNAME,
	    sizeof(AN_DEFAULT_NETNAME) - 1);
	sc->an_ssidlist.an_ssid1_len = strlen(AN_DEFAULT_NETNAME);

	sc->an_config.an_opmode = AN_OPMODE_INFRASTRUCTURE_STATION;

	sc->an_tx_rate = 0;
#if 0
	memset(&sc->an_stats, 0, sizeof(sc->an_stats));
#endif

	/*
	 * Call MI attach routine.
	 */
	if_attach(ifp);
	ether_ifattach(ifp, sc->an_caps.an_oemaddr);

#ifdef IFM_IEEE80211
	ifmedia_init(&sc->sc_media, 0, an_media_change, an_media_status);
	ifmedia_add(&sc->sc_media, IFM_MAKEWORD(IFM_IEEE80211, IFM_AUTO,
	    0, 0), 0, NULL);
	ifmedia_add(&sc->sc_media, IFM_MAKEWORD(IFM_IEEE80211, IFM_AUTO,
	    IFM_IEEE80211_ADHOC, 0), 0, NULL);
	for (i = 0; i < sizeof(sc->an_caps.an_rates); i++) {
		switch (sc->an_caps.an_rates[i]) {
		case AN_RATE_1MBPS:
			mtype = IFM_IEEE80211_DS1;
			break;
		case AN_RATE_2MBPS:
			mtype = IFM_IEEE80211_DS2;
			break;
		case AN_RATE_5_5MBPS:
			mtype = IFM_IEEE80211_DS5;
			break;
		case AN_RATE_11MBPS:
			mtype = IFM_IEEE80211_DS11;
			break;
		default:
			continue;
		}
		ifmedia_add(&sc->sc_media, IFM_MAKEWORD(IFM_IEEE80211, mtype,
		    0, 0), 0, NULL);
		ifmedia_add(&sc->sc_media, IFM_MAKEWORD(IFM_IEEE80211, mtype,
		    IFM_IEEE80211_ADHOC, 0), 0, NULL);
	}
	an_media_status(ifp, &imr);
	ifmedia_set(&sc->sc_media, imr.ifm_active);
#endif
	callout_init(&sc->an_stat_ch);
	splx(s);

	return(0);
}

int
an_detach(struct an_softc *sc)
{
	struct ifnet *ifp = &sc->arpcom.ec_if;
	int s;

	s = splnet();
	an_stop(ifp, 1);
	ifmedia_delete_instance(&sc->sc_media, IFM_INST_ANY);
	ether_ifdetach(ifp);
	if_detach(ifp);
	splx(s);
	return 0;
}

int
an_activate(struct device *self, enum devact act)
{
	struct an_softc *sc = (struct an_softc *)self;
	int s, error = 0;

	s = splnet();
	switch (act) {
	case DVACT_ACTIVATE:
		error = EOPNOTSUPP;
		break;

	case DVACT_DEACTIVATE:
		if_deactivate(&sc->arpcom.ec_if);
		break;
	}
	splx(s);

	return error;
}

void
an_power(int why, void *arg)
{
	int s;
	struct an_softc *sc = arg;
	struct ifnet *ifp = &sc->arpcom.ec_if;

	s = splnet();
	switch (why) {
	case PWR_SUSPEND:
	case PWR_STANDBY:
		an_stop(ifp, 1);
		break;
	case PWR_RESUME:
		if (ifp->if_flags & IFF_UP)
			an_init(ifp);
		break;
	case PWR_SOFTSUSPEND:
	case PWR_SOFTSTANDBY:
	case PWR_SOFTRESUME:
		break;
	}
	splx(s);
}

void
an_shutdown(void *arg)
{
	struct an_softc *sc = arg;

	an_stop(&sc->arpcom.ec_if, 1);
	return;
}

static int
an_setdef(struct an_softc *sc, struct an_req *areq)
{
	int error;
	struct ifnet *ifp = &sc->arpcom.ec_if;
	struct an_ltv_genconfig	*cfg;
	struct an_ltv_gen *sp;

	error = 0;

	switch (areq->an_type) {
	case AN_RID_GENCONFIG:
		cfg = (struct an_ltv_genconfig *)areq;
		memcpy(sc->an_caps.an_oemaddr, cfg->an_macaddr, ETHER_ADDR_LEN);
		memcpy(LLADDR(ifp->if_sadl), cfg->an_macaddr, ETHER_ADDR_LEN);
		memcpy(&sc->an_config, areq, sizeof(struct an_ltv_genconfig));
		error = ENETRESET;
		break;
	case AN_RID_SSIDLIST:
		memcpy(&sc->an_ssidlist, areq, sizeof(struct an_ltv_ssidlist));
		error = ENETRESET;
		break;
	case AN_RID_APLIST:
		memcpy(&sc->an_aplist, areq, sizeof(struct an_ltv_aplist));
		error = ENETRESET;
		break;
	case AN_RID_TX_SPEED:
		sp = (struct an_ltv_gen *)areq;
		sc->an_tx_rate = sp->an_val;
		break;
	case AN_RID_WEP_VOLATILE:
	case AN_RID_WEP_PERSISTENT:
	case AN_RID_LEAP_USER:
	case AN_RID_LEAP_PASS:
		if (!sc->sc_enabled) {
			error = ENXIO;
			break;
		}
		an_cmd(sc, AN_CMD_DISABLE, 0);
		an_write_record(sc, (struct an_ltv_gen *)areq);
		if (an_cmd(sc, AN_CMD_ENABLE, 0))
			error = EIO;
		break;
	default:
		if (ifp->if_flags & IFF_DEBUG)
			printf("%s: unknown RID: %x\n", sc->an_dev.dv_xname,
			    areq->an_type);
		error = EINVAL;
		break;
	}
	return error;
}

static int
an_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
{
	int s;
	int error = 0;
	struct an_softc *sc;
	struct an_req *areq;
	struct ifreq *ifr;
	struct ieee80211_nwid nwid;
	struct ieee80211_power *power;

	sc = ifp->if_softc;
	ifr = (struct ifreq *)data;
	s = splnet();

	switch (command) {
	case SIOCSIFFLAGS:
		if (ifp->if_flags & IFF_UP) {
			if (sc->sc_enabled) {
				/*
				 * To avoid rescanning another access point,
				 * do not call an_init() here.  Instead, only
				 * reflect promisc mode settings.
				 */
				error = an_cmd(sc, AN_CMD_SET_MODE,
				    (ifp->if_flags & IFF_PROMISC) ? 0xffff : 0);
			} else
				error = an_init(ifp);
		} else if (sc->sc_enabled)
			an_stop(ifp, 1);
		break;
	case SIOCGAIRONET:
		areq = &sc->an_reqbuf;
		error = copyin(ifr->ifr_data, areq, sizeof(struct an_req));
		if (error)
			break;
		switch (areq->an_type) {
#ifdef ANCACHE
		case AN_RID_ZERO_CACHE:
			/* XXX suser()? -- should belong to SIOCSAIRONET */
			sc->an_sigitems = sc->an_nextitem = 0;
			goto out;
		case AN_RID_READ_CACHE:
			caddr_t pt = (char *)&areq->an_val;
			memcpy(pt, &sc->an_sigitems, sizeof(int));
			pt += sizeof(int);
			areq->an_len = sizeof(int) / 2;
			memcpy(pt, &sc->an_sigcache,
			    sizeof(struct an_sigcache) * sc->an_sigitems);
			areq->an_len += ((sizeof(struct an_sigcache) *
			    sc->an_sigitems) / 2) + 1;
			break;
#endif
		default:
			if (an_read_record(sc, (struct an_ltv_gen *)areq)) {
				error = EINVAL;
				break;
			}
			break;
		}
		error = copyout(areq, ifr->ifr_data, sizeof(struct an_req));
		break;
	case SIOCSAIRONET:
		if ((error = suser(curproc->p_ucred, &curproc->p_acflag)))
			break;
		areq = &sc->an_reqbuf;
		error = copyin(ifr->ifr_data, areq, sizeof(struct an_req));
		if (error)
			break;
		error = an_setdef(sc, areq);
		break;
	case SIOCS80211NWID:
		error = copyin(ifr->ifr_data, &nwid, sizeof(nwid));
		if (error)
			break;
		if (nwid.i_len > IEEE80211_NWID_LEN) {
			error = EINVAL;
			break;
		}
		if (sc->an_ssidlist.an_ssid1_len == nwid.i_len &&
		    memcmp(sc->an_ssidlist.an_ssid1, nwid.i_nwid, nwid.i_len)
		    == 0)
			break;
		memset(sc->an_ssidlist.an_ssid1, 0, IEEE80211_NWID_LEN);
		sc->an_ssidlist.an_ssid1_len = nwid.i_len;
		memcpy(sc->an_ssidlist.an_ssid1, nwid.i_nwid, nwid.i_len);
		error = ENETRESET;
		break;
	case SIOCG80211NWID:
		memset(&nwid, 0, sizeof(nwid));
		if (sc->sc_enabled && sc->an_associated) {
			nwid.i_len = sc->an_status.an_ssidlen;
			memcpy(nwid.i_nwid, sc->an_status.an_ssid, nwid.i_len);
		} else {
			nwid.i_len = sc->an_ssidlist.an_ssid1_len;
			memcpy(nwid.i_nwid, sc->an_ssidlist.an_ssid1,
			    nwid.i_len);
		}
		error = copyout(&nwid, ifr->ifr_data, sizeof(nwid));
		break;
	case SIOCS80211NWKEY:
		error = an_set_nwkey(sc, (struct ieee80211_nwkey *)data);
		break;
	case SIOCG80211NWKEY:
		error = an_get_nwkey(sc, (struct ieee80211_nwkey *)data);
		break;
	case SIOCS80211POWER:
		power = (struct ieee80211_power *)data;
		sc->an_config.an_psave_mode = power->i_enabled ?
		    AN_PSAVE_PSP : AN_PSAVE_NONE;
		sc->an_config.an_listen_interval = power->i_maxsleep;
		error = ENETRESET;
		break;
	case SIOCG80211POWER:
		power = (struct ieee80211_power *)data;
		power->i_enabled =
		    sc->an_config.an_psave_mode != AN_PSAVE_NONE ? 1 : 0;
		power->i_maxsleep = sc->an_config.an_listen_interval;
		break;
#ifdef IFM_IEEE80211
	case SIOCSIFMEDIA:
	case SIOCGIFMEDIA:
		error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, command);
		break;
#endif
	case SIOCADDMULTI:
	case SIOCDELMULTI:
		error = ether_ioctl(ifp, command, data);
		if (error == ENETRESET) {
			/* we don't have multicast filter. */
			error = 0;
		}
		break;
	default:
		error = ether_ioctl(ifp, command, data);
		break;
	}
	if (error == ENETRESET) {
		if (sc->sc_enabled)
			error = an_init(ifp);
		else
			error = 0;
	}
#ifdef ANCACHE
out:
#endif
	splx(s);
	return error;
}

static int
an_set_nwkey(struct an_softc *sc, struct ieee80211_nwkey *nwkey)
{
	int error;
	u_int16_t prevauth;

	error = 0;
	prevauth = sc->an_config.an_authtype;

	switch (nwkey->i_wepon) {
	case IEEE80211_NWKEY_OPEN:
		sc->an_config.an_authtype = AN_AUTHTYPE_OPEN;
		break;

	case IEEE80211_NWKEY_WEP:
	case IEEE80211_NWKEY_WEP | IEEE80211_NWKEY_PERSIST:
		error = an_set_nwkey_wep(sc, nwkey);
		if (error == 0 || error == ENETRESET)
			sc->an_config.an_authtype =
			    AN_AUTHTYPE_OPEN | AN_AUTHTYPE_PRIVACY_IN_USE;
		break;

	case IEEE80211_NWKEY_EAP:
		error = an_set_nwkey_eap(sc, nwkey);
		if (error == 0 || error == ENETRESET)
			sc->an_config.an_authtype = AN_AUTHTYPE_OPEN |
			    AN_AUTHTYPE_PRIVACY_IN_USE | AN_AUTHTYPE_LEAP;
		break;
	default:
		error = EINVAL;
		break;
	}
	if (error == 0 && prevauth != sc->an_config.an_authtype)
		error = ENETRESET;
	return error;
}

static int
an_set_nwkey_wep(struct an_softc *sc, struct ieee80211_nwkey *nwkey)
{
	int i, txkey, anysetkey, needreset, error;
	struct an_wepkey keys[IEEE80211_WEP_NKID];

	error = 0;
	memset(keys, 0, sizeof(keys));
	anysetkey = needreset = 0;

	/* load argument and sanity check */
	for (i = 0; i < IEEE80211_WEP_NKID; i++) {
		keys[i].an_wep_keylen = nwkey->i_key[i].i_keylen;
		if (keys[i].an_wep_keylen < 0)
			continue;
		if (keys[i].an_wep_keylen != 0 &&
		    keys[i].an_wep_keylen < IEEE80211_WEP_KEYLEN)
			return EINVAL;
		if (keys[i].an_wep_keylen > sizeof(keys[i].an_wep_key))
			return EINVAL;
		if ((error = copyin(nwkey->i_key[i].i_keydat,
		    keys[i].an_wep_key, keys[i].an_wep_keylen)) != 0)
			return error;
		anysetkey++;
	}
	txkey = nwkey->i_defkid - 1;
	if (txkey >= 0) {
		if (txkey >= IEEE80211_WEP_NKID)
			return EINVAL;
		/* default key must have a valid value */
		if (keys[txkey].an_wep_keylen == 0 ||
		    (keys[txkey].an_wep_keylen < 0 &&
		    sc->an_perskeylen[txkey] == 0))
			return EINVAL;
		anysetkey++;
	}
	if (!(nwkey->i_wepon & IEEE80211_NWKEY_PERSIST)) {
		/* set temporary keys */
		sc->an_tx_key = txkey;
		for (i = 0; i < IEEE80211_WEP_NKID; i++) {
			if (keys[i].an_wep_keylen < 0)
				continue;
			memcpy(&sc->an_wepkeys[i], &keys[i], sizeof(keys[i]));
		}
	} else {
		/* set persist keys */
		if (anysetkey) {
			/* prepare to write nvram */
			if (!sc->sc_enabled) {
				if (sc->sc_enable)
					(*sc->sc_enable)(sc);
				an_wait(sc);
				sc->sc_enabled = 1;
				error = an_write_wepkey(sc,
				    AN_RID_WEP_PERSISTENT, keys, txkey);
				if (sc->sc_disable)
					(*sc->sc_disable)(sc);
				sc->sc_enabled = 0;
			} else {
				an_cmd(sc, AN_CMD_DISABLE, 0);
				error = an_write_wepkey(sc,
				    AN_RID_WEP_PERSISTENT, keys, txkey);
				an_cmd(sc, AN_CMD_ENABLE, 0);
			}
			if (error)
				return error;
		}
		if (txkey >= 0)
			sc->an_tx_perskey = txkey;
		if (sc->an_tx_key >= 0) {
			sc->an_tx_key = -1;
			needreset++;
		}
		for (i = 0; i < IEEE80211_WEP_NKID; i++) {
			if (sc->an_wepkeys[i].an_wep_keylen >= 0) {
				memset(&sc->an_wepkeys[i].an_wep_key, 0,
				    sizeof(sc->an_wepkeys[i].an_wep_key));
				sc->an_wepkeys[i].an_wep_keylen = -1;
				needreset++;
			}
			if (keys[i].an_wep_keylen >= 0)
				sc->an_perskeylen[i] = keys[i].an_wep_keylen;
		}
	}
	if (needreset) {
		/* firmware restart to reload persistent key */
		an_reset(sc);
	}
	if (anysetkey || needreset)
		error = ENETRESET;
	return error;
}

static int
an_set_nwkey_eap(struct an_softc *sc, struct ieee80211_nwkey *nwkey)
{
	int i, error;
	struct an_ltv_leapkey *key;
	u_int16_t unibuf[sizeof(key->an_key)];
	MD4_CTX ctx;

	error = 0;

	if (nwkey->i_key[0].i_keydat == NULL &&
	    nwkey->i_key[1].i_keydat == NULL)
		return 0;
	if (!sc->sc_enabled)
		return ENXIO;
	an_cmd(sc, AN_CMD_DISABLE, 0);
	key = (struct an_ltv_leapkey *)&sc->an_reqbuf;
	if (nwkey->i_key[0].i_keydat != NULL) {
		memset(key, 0, sizeof(*key));
		key->an_type = AN_RID_LEAP_USER;
		key->an_len = sizeof(*key);
		key->an_key_len = nwkey->i_key[0].i_keylen;
		if (key->an_key_len > sizeof(key->an_key))
			return EINVAL;
		if ((error = copyin(nwkey->i_key[0].i_keydat, key->an_key,
		    key->an_key_len)) != 0)
			return error;
		an_write_record(sc, (struct an_ltv_gen *)key);
	}
	if (nwkey->i_key[1].i_keydat != NULL) {
		memset(key, 0, sizeof(*key));
		key->an_type = AN_RID_LEAP_PASS;
		key->an_len = sizeof(*key);
		key->an_key_len = nwkey->i_key[1].i_keylen;
		if (key->an_key_len > sizeof(key->an_key))
			return EINVAL;
		if ((error = copyin(nwkey->i_key[1].i_keydat, key->an_key,
		    key->an_key_len)) != 0)
			return error;
		/*
		 * Cisco seems to use PasswordHash and PasswordHashHash
		 * in RFC-2759 (MS-CHAP-V2).
		 */
		memset(unibuf, 0, sizeof(unibuf));
		/* XXX: convert password to unicode */
		for (i = 0; i < key->an_key_len; i++)
			unibuf[i] = key->an_key[i];
		/* set PasswordHash */
		MD4Init(&ctx);
		MD4Update(&ctx, (u_int8_t *)unibuf, key->an_key_len * 2);
		MD4Final(key->an_key, &ctx);
		/* set PasswordHashHash */
		MD4Init(&ctx);
		MD4Update(&ctx, key->an_key, 16);
		MD4Final(key->an_key + 16, &ctx);
		key->an_key_len = 32;
		an_write_record(sc, (struct an_ltv_gen *)key);
	}
	error = an_cmd(sc, AN_CMD_ENABLE, 0);
	if (error)
		printf("%s: an_set_nwkey: failed to enable MAC\n",
		    sc->an_dev.dv_xname);
	else
		error = ENETRESET;
	return error;
}

static int
an_get_nwkey(struct an_softc *sc, struct ieee80211_nwkey *nwkey)
{
	int i, error;

	error = 0;
	if (sc->an_config.an_authtype & AN_AUTHTYPE_LEAP)
		nwkey->i_wepon = IEEE80211_NWKEY_EAP;
	else if (sc->an_config.an_authtype & AN_AUTHTYPE_PRIVACY_IN_USE)
		nwkey->i_wepon = IEEE80211_NWKEY_WEP;
	else
		nwkey->i_wepon = IEEE80211_NWKEY_OPEN;
	if (sc->an_tx_key == -1)
		nwkey->i_defkid = sc->an_tx_perskey + 1;
	else
		nwkey->i_defkid = sc->an_tx_key + 1;
	if (nwkey->i_key[0].i_keydat == NULL)
		return 0;
	for (i = 0; i < IEEE80211_WEP_NKID; i++) {
		if (nwkey->i_key[i].i_keydat == NULL)
			continue;
		/* do not show any keys to non-root user */
		if ((error = suser(curproc->p_ucred, &curproc->p_acflag)) != 0)
			break;
		nwkey->i_key[i].i_keylen = sc->an_wepkeys[i].an_wep_keylen;
		if (nwkey->i_key[i].i_keylen < 0) {
			if (sc->an_perskeylen[i] == 0)
				nwkey->i_key[i].i_keylen = 0;
			continue;
		}
		if ((error = copyout(sc->an_wepkeys[i].an_wep_key,
		    nwkey->i_key[i].i_keydat,
		    sc->an_wepkeys[i].an_wep_keylen)) != 0)
			break;
	}
	return error;
}

static int
an_write_wepkey(struct an_softc *sc, int type, struct an_wepkey *keys, int kid)
{
	int i, error;
	struct an_ltv_wepkey	*akey;

	error = 0;
	akey = (struct an_ltv_wepkey *)&sc->an_reqbuf;
	memset(akey, 0, sizeof(struct an_ltv_wepkey));
	akey->an_type = type;
	akey->an_len = sizeof(struct an_ltv_wepkey);
	for (i = 0; i < IEEE80211_WEP_NKID; i++) {
		if (keys[i].an_wep_keylen < 0 ||
		    keys[i].an_wep_keylen > sizeof(akey->an_key))
			continue;
		akey->an_key_len = keys[i].an_wep_keylen;
		akey->an_key_index = i;
		akey->an_mac_addr[0] = 1;	/* default mac */
		memcpy(akey->an_key, keys[i].an_wep_key, akey->an_key_len);
		error = an_write_record(sc, (struct an_ltv_gen *)akey);
		if (error)
			return error;
	}
	if (kid >= 0) {
		akey->an_key_index = 0xffff;
		akey->an_mac_addr[0] = kid;
		akey->an_key_len = 0;
		memset(akey->an_key, 0, sizeof(akey->an_key));
		error = an_write_record(sc, (struct an_ltv_gen *)akey);
	}
	return error;
}

#ifdef IFM_IEEE80211
static int
an_media_change(struct ifnet *ifp)
{
	struct an_softc *sc = ifp->if_softc;
	struct ifmedia_entry *ime;
	int error;

	error = 0;
	ime = sc->sc_media.ifm_cur;
	switch (IFM_SUBTYPE(ime->ifm_media)) {
	case IFM_AUTO:
		sc->an_tx_rate = 0;
		break;
	case IFM_IEEE80211_DS1:
		sc->an_tx_rate = AN_RATE_1MBPS;
		break;
	case IFM_IEEE80211_DS2:
		sc->an_tx_rate = AN_RATE_2MBPS;
		break;
	case IFM_IEEE80211_DS5:
		sc->an_tx_rate = AN_RATE_5_5MBPS;
		break;
	case IFM_IEEE80211_DS11:
		sc->an_tx_rate = AN_RATE_11MBPS;
		break;
	}
	if (ime->ifm_media & IFM_IEEE80211_ADHOC)
		sc->an_config.an_opmode = AN_OPMODE_IBSS_ADHOC;
	else
		sc->an_config.an_opmode = AN_OPMODE_INFRASTRUCTURE_STATION;
	/*
	 * XXX: how to set txrate for the firmware?
	 * There is a struct defined as an_txframe, which is used nowhere.
	 * Perhaps we need to change the transmit mode from 802.3 to native.
	 */

	/* we cannot return ENETRESET here */
	if (sc->sc_enabled)
		error = an_init(ifp);
	return error;
}

static void
an_media_status(ifp, imr)
	struct ifnet *ifp;
	struct ifmediareq *imr;
{
	struct an_softc *sc = ifp->if_softc;

	imr->ifm_status = IFM_AVALID;
	imr->ifm_active = IFM_IEEE80211;
	if (sc->sc_enabled && sc->an_associated) {
		imr->ifm_status |= IFM_ACTIVE;
		switch (sc->an_status.an_current_tx_rate) {
		case 0:
			imr->ifm_active |= IFM_AUTO;
			break;
		case AN_RATE_1MBPS:
			imr->ifm_active |= IFM_IEEE80211_DS1;
			break;
		case AN_RATE_2MBPS:
			imr->ifm_active |= IFM_IEEE80211_DS2;
			break;
		case AN_RATE_5_5MBPS:
			imr->ifm_active |= IFM_IEEE80211_DS5;
			break;
		case AN_RATE_11MBPS:
			imr->ifm_active |= IFM_IEEE80211_DS11;
			break;
		}
	}
	if ((sc->an_config.an_opmode & 0x0f) == AN_OPMODE_IBSS_ADHOC)
		imr->ifm_active |= IFM_IEEE80211_ADHOC;
}
#endif /* IFM_IEEE80211 */

static int
an_init_tx_ring(struct an_softc *sc)
{
	int i, id;

	for (i = 0; i < AN_TX_RING_CNT; i++) {
		if (an_alloc_nicmem(sc,
		    ETHER_MAX_LEN + ETHER_TYPE_LEN + AN_802_11_OFFSET, &id))
			return ENOMEM;
		sc->an_rdata.an_tx_fids[i] = id;
		sc->an_rdata.an_tx_ring[i] = 0;
	}

	sc->an_rdata.an_tx_prod = 0;
	sc->an_rdata.an_tx_cons = 0;
	return 0;
}

static int
an_init(struct ifnet *ifp)
{
	struct an_softc *sc = (struct an_softc *)ifp->if_softc;

	if (sc->sc_enabled) {
		an_stop(ifp, 0);
	} else {
		if (sc->sc_enable)
			(*sc->sc_enable)(sc);
		sc->sc_enabled = 1;
		an_wait(sc);
	}

	sc->an_associated = 0;

	/* Allocate the TX buffers */
	if (an_init_tx_ring(sc)) {
		an_reset(sc);
		if (an_init_tx_ring(sc)) {
			printf("%s: tx buffer allocation failed\n",
			    sc->an_dev.dv_xname);
			an_stop(ifp, 1);
			return ENOMEM;
		}
	}

	/* Set our MAC address. */
	memcpy(sc->an_config.an_macaddr, sc->an_caps.an_oemaddr,
	    ETHER_ADDR_LEN);

	if (ifp->if_flags & IFF_MULTICAST)
		sc->an_config.an_rxmode = AN_RXMODE_BC_MC_ADDR;
	else if (ifp->if_flags & IFF_BROADCAST)
		sc->an_config.an_rxmode = AN_RXMODE_BC_ADDR;
	else
		sc->an_config.an_rxmode = AN_RXMODE_ADDR;

	/* Set the ssid list */
	sc->an_ssidlist.an_type = AN_RID_SSIDLIST;
	sc->an_ssidlist.an_len = sizeof(struct an_ltv_ssidlist);
	if (an_write_record(sc, (struct an_ltv_gen *)&sc->an_ssidlist)) {
		printf("%s: failed to set ssid list\n", sc->an_dev.dv_xname);
		an_stop(ifp, 1);
		return ENXIO;
	}

	/* Set the AP list */
	sc->an_aplist.an_type = AN_RID_APLIST;
	sc->an_aplist.an_len = sizeof(struct an_ltv_aplist);
	if (an_write_record(sc, (struct an_ltv_gen *)&sc->an_aplist)) {
		printf("%s: failed to set AP list\n", sc->an_dev.dv_xname);
		an_stop(ifp, 1);
		return ENXIO;
	}

	/* Set the configuration in the NIC */
	sc->an_config.an_len = sizeof(struct an_ltv_genconfig);
	sc->an_config.an_type = AN_RID_GENCONFIG;
	if (an_write_record(sc, (struct an_ltv_gen *)&sc->an_config)) {
		printf("%s: failed to set configuration\n", sc->an_dev.dv_xname);
		an_stop(ifp, 1);
		return ENXIO;
	}

	/* Set the WEP Keys */
	if ((sc->an_config.an_authtype & AN_AUTHTYPE_PRIVACY_IN_USE) != 0)
		an_write_wepkey(sc, AN_RID_WEP_VOLATILE, sc->an_wepkeys,
		    sc->an_tx_key);

	/* Enable the MAC */
	if (an_cmd(sc, AN_CMD_ENABLE, 0)) {
		printf("%s: failed to enable MAC\n", sc->an_dev.dv_xname);
		an_stop(ifp, 1);
		return ENXIO;
	}

	an_cmd(sc, AN_CMD_SET_MODE, (ifp->if_flags & IFF_PROMISC) ? 0xffff : 0);

	/* enable interrupts */
	CSR_WRITE_2(sc, AN_INT_EN, AN_INTRS);

	ifp->if_flags |= IFF_RUNNING;
	ifp->if_flags &= ~IFF_OACTIVE;

	callout_reset(&sc->an_stat_ch, hz, an_stats_update, sc);
	return 0;
}

static void
an_start(struct ifnet *ifp)
{
	struct an_softc *sc = (struct an_softc *)ifp->if_softc;
	struct mbuf *m0 = NULL, *m;
	struct an_txframe_802_3 tx_frame_802_3;
	struct ether_header *eh;
	int id, idx;
	u_int16_t txctl;

	if (!sc->sc_enabled)
		return;

	if (ifp->if_flags & IFF_OACTIVE)
		return;

	if (!sc->an_associated)
		return;

	idx = sc->an_rdata.an_tx_prod;
	memset(&tx_frame_802_3, 0, sizeof(tx_frame_802_3));

	for (;;) {
		IFQ_POLL(&ifp->if_snd, m0);
		if (m0 == NULL)
			break;
		if (sc->an_rdata.an_tx_ring[idx] != 0)
			break;
		id = sc->an_rdata.an_tx_fids[idx];
		IFQ_DEQUEUE(&ifp->if_snd, m0);
#if NBPFILTER > 0
		/*
		 * If there's a BPF listner, bounce a copy of
		 * this frame to him.
		 */
		if (ifp->if_bpf)
			bpf_mtap(ifp->if_bpf, m0);
#endif

		txctl = AN_TXCTL_8023;
		/* write the txctl only */
		an_write_data(sc, id, 0x08, (caddr_t)&txctl, sizeof(txctl));

		eh = mtod(m0, struct ether_header *);
		memcpy(tx_frame_802_3.an_tx_dst_addr, eh->ether_dhost,
		    ETHER_ADDR_LEN);
		memcpy(tx_frame_802_3.an_tx_src_addr, eh->ether_shost,
		    ETHER_ADDR_LEN);
		tx_frame_802_3.an_tx_802_3_payload_len =
		    m0->m_pkthdr.len - ETHER_ADDR_LEN * 2;
		m_adj(m0, ETHER_ADDR_LEN * 2);

		/* 802_3 header */
		an_write_data(sc, id, AN_802_3_OFFSET,
		    (caddr_t)&tx_frame_802_3, sizeof(struct an_txframe_802_3));
		for (m = m0; m != NULL; m = m->m_next)
			an_write_data(sc, id, -1, mtod(m, caddr_t), m->m_len);
		m_freem(m0);
		m0 = NULL;

		sc->an_rdata.an_tx_ring[idx] = id;
		if (an_cmd(sc, AN_CMD_TX, id))
			printf("%s: xmit failed\n", sc->an_dev.dv_xname);

		AN_INC(idx, AN_TX_RING_CNT);
	}

	if (m0 != NULL)
		ifp->if_flags |= IFF_OACTIVE;

	sc->an_rdata.an_tx_prod = idx;

	/*
	 * Set a timeout in case the chip goes out to lunch.
	 */
	ifp->if_timer = 5;
}

void
an_stop(struct ifnet *ifp, int disable)
{
	struct an_softc *sc = (struct an_softc *)ifp->if_softc;
	int i;

	callout_stop(&sc->an_stat_ch);

	ifp->if_flags &= ~(IFF_RUNNING|IFF_OACTIVE);
	ifp->if_timer = 0;

	if (!sc->sc_enabled)
		return;

	an_cmd(sc, AN_CMD_FORCE_SYNCLOSS, 0);
	CSR_WRITE_2(sc, AN_INT_EN, 0);
	an_cmd(sc, AN_CMD_DISABLE, 0);

	for (i = 0; i < AN_TX_RING_CNT; i++)
		an_cmd(sc, AN_CMD_DEALLOC_MEM, sc->an_rdata.an_tx_fids[i]);

	if (disable) {
		if (sc->sc_disable)
			(*sc->sc_disable)(sc);
		sc->sc_enabled = 0;
	}
}

static void
an_watchdog(struct ifnet *ifp)
{
	struct an_softc *sc;

	sc = ifp->if_softc;
	if (!sc->sc_enabled)
		return;

	printf("%s: device timeout\n", sc->an_dev.dv_xname);

	an_reset(sc);
	an_init(ifp);

	ifp->if_oerrors++;
	return;
}

/*
 * Low level functions
 */

static void
an_rxeof(struct an_softc *sc)
{
	struct ifnet *ifp = &sc->arpcom.ec_if;
	struct ether_header *eh;
#ifdef ANCACHE
	struct an_rxframe rx_frame;
#endif
	struct an_rxframe_802_3	rx_frame_802_3;
	struct mbuf *m;
	int id, error = 0;


	id = CSR_READ_2(sc, AN_RX_FID);

	MGETHDR(m, M_DONTWAIT, MT_DATA);
	if (m == NULL) {
		ifp->if_ierrors++;
		return;
	}
	MCLGET(m, M_DONTWAIT);
	if (!(m->m_flags & M_EXT)) {
		m_freem(m);
		ifp->if_ierrors++;
		return;
	}

	m->m_pkthdr.rcvif = ifp;

	/* Align the data after the ethernet header */
	m->m_data = (caddr_t) ALIGN(m->m_data + sizeof(struct ether_header)) -
	    sizeof(struct ether_header);

	eh = mtod(m, struct ether_header *);

#ifdef ANCACHE
	/* Read NIC frame header */
	if (an_read_data(sc, id, 0, (caddr_t)&rx_frame, sizeof(rx_frame))) {
		ifp->if_ierrors++;
		return;
	}
#endif
	/* Read in the 802_3 frame header */
	if (an_read_data(sc, id, AN_802_3_OFFSET, (caddr_t)&rx_frame_802_3, 
	    sizeof(rx_frame_802_3))) {
		ifp->if_ierrors++;
		return;
	}

	if (rx_frame_802_3.an_rx_802_3_status != 0) {
		ifp->if_ierrors++;
		return;
	}

	/* Check for insane frame length */
	if (rx_frame_802_3.an_rx_802_3_payload_len > MCLBYTES) {
		ifp->if_ierrors++;
		return;
	}

	m->m_pkthdr.len = m->m_len =
	    rx_frame_802_3.an_rx_802_3_payload_len + ETHER_ADDR_LEN * 2;

	memcpy(&eh->ether_dhost, &rx_frame_802_3.an_rx_dst_addr,
	    ETHER_ADDR_LEN);
	memcpy(&eh->ether_shost, &rx_frame_802_3.an_rx_src_addr,
	    ETHER_ADDR_LEN);

	/* in mbuf header type is just before payload */
	error = an_read_data(sc, id, -1, (caddr_t)&(eh->ether_type), 
	     rx_frame_802_3.an_rx_802_3_payload_len);

	if (error) {
		m_freem(m);
		ifp->if_ierrors++;
		return;
	}

	ifp->if_ipackets++;

	/* Receive packet. */
#ifdef ANCACHE
	an_cache_store(sc, eh, m, rx_frame.an_rx_signal_strength);
#endif
#if NBPFILTER > 0
	if (ifp->if_bpf)
		bpf_mtap(ifp->if_bpf, m);
#endif
	(*ifp->if_input)(ifp, m);
}

static void
an_txeof(struct an_softc *sc, int status)
{
	struct ifnet *ifp = &sc->arpcom.ec_if;
	int i, id;

	ifp->if_timer = 0;
	ifp->if_flags &= ~IFF_OACTIVE;

	id = CSR_READ_2(sc, AN_TX_CMP_FID);

	if (status & AN_EV_TX_EXC)
		ifp->if_oerrors++;
	else
		ifp->if_opackets++;

	/* fix from Doug Ambrisko -wsr */
	for (i = 0; i < AN_TX_RING_CNT; i++) {
		if (id == sc->an_rdata.an_tx_ring[i]) {
			sc->an_rdata.an_tx_ring[i] = 0;
			break;
		}
	}
	if (i != sc->an_rdata.an_tx_cons) {
		if (ifp->if_flags & IFF_DEBUG)
			printf("%s: id mismatch: id %x, "
			    "expected %x(%d), actual %x(%d)\n",
			    sc->an_dev.dv_xname, id,
			    sc->an_rdata.an_tx_ring[sc->an_rdata.an_tx_cons],
			    sc->an_rdata.an_tx_cons, id, i);
	}

	AN_INC(sc->an_rdata.an_tx_cons, AN_TX_RING_CNT);

	return;
}

/*
 * We abuse the stats updater to check the current NIC status. This
 * is important because we don't want to allow transmissions until
 * the NIC has synchronized to the current cell (either as the master
 * in an ad-hoc group, or as a station connected to an access point).
 */
void
an_stats_update(void *xsc)
{
	struct an_softc *sc = xsc;

	if (sc->sc_enabled) {
		sc->an_status.an_type = AN_RID_STATUS;
		sc->an_status.an_len = sizeof(struct an_ltv_status);
		if (an_read_record(sc, (struct an_ltv_gen *)&sc->an_status)
		    == 0) {
			if (sc->an_status.an_opmode & AN_STATUS_OPMODE_IN_SYNC)
				sc->an_associated = 1;
			else
				sc->an_associated = 0;
#if 0
			/* Don't do this while we're transmitting */
			if (sc->arpcom.ec_if.if_flags & IFF_OACTIVE) {
				sc->an_stats.an_len =
				    sizeof(struct an_ltv_stats);
				sc->an_stats.an_type = AN_RID_32BITS_CUM;
				an_read_record(sc,
				    (struct an_ltv_gen *)&sc->an_stats.an_len);
			}
#endif
		}
	}
	callout_reset(&sc->an_stat_ch, hz, an_stats_update, sc);
}

int
an_intr(void *arg)
{
	struct an_softc *sc = arg;
	struct ifnet *ifp = &sc->arpcom.ec_if;
	u_int16_t status;

	if (!sc->sc_enabled)
		return 0;

	if (!(ifp->if_flags & IFF_UP)) {
		CSR_WRITE_2(sc, AN_EVENT_ACK, 0xFFFF);
		CSR_WRITE_2(sc, AN_INT_EN, 0);
		return 0;
	}

	/* Disable interrupts. */
	CSR_WRITE_2(sc, AN_INT_EN, 0);

	while ((status = (CSR_READ_2(sc, AN_EVENT_STAT) & AN_INTRS)) != 0) {
		if (status & AN_EV_RX) {
			an_rxeof(sc);
			CSR_WRITE_2(sc, AN_EVENT_ACK, AN_EV_RX);
			status &= ~AN_EV_RX;
		}
		if (status & (AN_EV_TX | AN_EV_TX_EXC)) {
			an_txeof(sc, status);
			CSR_WRITE_2(sc, AN_EVENT_ACK,
			    status & (AN_EV_TX | AN_EV_TX_EXC));
			status &= ~(AN_EV_TX | AN_EV_TX_EXC);
		}
		if (status & AN_EV_LINKSTAT) {
			if (CSR_READ_2(sc, AN_LINKSTAT) ==
			    AN_LINKSTAT_ASSOCIATED)
				sc->an_associated = 1;
			else
				sc->an_associated = 0;
			CSR_WRITE_2(sc, AN_EVENT_ACK, AN_EV_LINKSTAT);
			status &= ~AN_EV_LINKSTAT;
		}
#if 0
		if (status & AN_EV_CMD) {
			wakeup(sc);
			CSR_WRITE_2(sc, AN_EVENT_ACK, AN_EV_CMD);
			status &= ~AN_EV_CMD;
		}
#endif
		if (status)
			CSR_WRITE_2(sc, AN_EVENT_ACK, status);
	}

	/* Re-enable interrupts. */
	CSR_WRITE_2(sc, AN_INT_EN, AN_INTRS);

	if (IFQ_IS_EMPTY(&ifp->if_snd) == 0)
		an_start(ifp);

	return 1;
}

static int
an_cmd(struct an_softc *sc, int cmd, int val)
{
	int i, stat;

	/* make sure that previous command completed */
	if (CSR_READ_2(sc, AN_COMMAND) & AN_CMD_BUSY) {
		if (sc->arpcom.ec_if.if_flags & IFF_DEBUG)
			printf("%s: command 0x%x busy\n", sc->an_dev.dv_xname,
			    CSR_READ_2(sc, AN_COMMAND));
		CSR_WRITE_2(sc, AN_EVENT_ACK, AN_EV_CLR_STUCK_BUSY);
	}

	CSR_WRITE_2(sc, AN_PARAM0, val);
	CSR_WRITE_2(sc, AN_PARAM1, 0);
	CSR_WRITE_2(sc, AN_PARAM2, 0);
	CSR_WRITE_2(sc, AN_COMMAND, cmd);

	for (i = 0; i < AN_TIMEOUT; i++) {
		if (CSR_READ_2(sc, AN_EVENT_STAT) & AN_EV_CMD)
			break;
		/* make sure the command is accepted */
		if (CSR_READ_2(sc, AN_COMMAND) == cmd)
			CSR_WRITE_2(sc, AN_COMMAND, cmd);
		DELAY(10);
	}

	stat = CSR_READ_2(sc, AN_STATUS);

	/* clear stuck command busy if necessary */
	if (CSR_READ_2(sc, AN_COMMAND) & AN_CMD_BUSY)
		CSR_WRITE_2(sc, AN_EVENT_ACK, AN_EV_CLR_STUCK_BUSY);

	/* Ack the command */
	CSR_WRITE_2(sc, AN_EVENT_ACK, AN_EV_CMD);

	if (i == AN_TIMEOUT) {
		if (sc->arpcom.ec_if.if_flags & IFF_DEBUG)
			printf("%s: command 0x%x param 0x%x timeout\n",
			    sc->an_dev.dv_xname, cmd, val);
		return ETIMEDOUT;
	}
	if (stat & AN_STAT_CMD_RESULT) {
		if (sc->arpcom.ec_if.if_flags & IFF_DEBUG)
			printf("%s: command 0x%x param 0x%x stat 0x%x\n",
			    sc->an_dev.dv_xname, cmd, val, stat);
		return EIO;
	}

	return 0;
}

/*
 * This reset sequence may look a little strange, but this is the
 * most reliable method I've found to really kick the NIC in the
 * head and force it to reboot correctly.
 */
static void
an_reset(struct an_softc *sc)
{

	if (!sc->sc_enabled)
		return;

	an_cmd(sc, AN_CMD_ENABLE, 0);
	an_cmd(sc, AN_CMD_FW_RESTART, 0);
	an_cmd(sc, AN_CMD_NOOP2, 0);

	if (an_cmd(sc, AN_CMD_FORCE_SYNCLOSS, 0) == ETIMEDOUT)
		printf("%s: reset failed\n", sc->an_dev.dv_xname);

	an_cmd(sc, AN_CMD_DISABLE, 0);
}

/*
 * Wait for firmware come up after power enabled.
 */
static void
an_wait(struct an_softc *sc)
{
	int i;

	CSR_WRITE_2(sc, AN_COMMAND, AN_CMD_NOOP2);
	for (i = 0; i < 3*hz; i++) {
		if (CSR_READ_2(sc, AN_EVENT_STAT) & AN_EV_CMD)
			break;
		(void)tsleep(sc, PWAIT, "anatch", 1);
	}
	CSR_WRITE_2(sc, AN_EVENT_ACK, AN_EV_CMD);
}

/*
 * Read an LTV record from the NIC.
 */
static int
an_read_record(struct an_softc *sc, struct an_ltv_gen *ltv)
{
	u_int16_t *ptr;
	int i, len;

	if (ltv->an_len == 0 || ltv->an_type == 0)
		return EINVAL;

	/* Tell the NIC to enter record read mode. */
	if (an_cmd(sc, AN_CMD_ACCESS|AN_ACCESS_READ, ltv->an_type))
		return EIO;

	/* Seek to the record. */
	if (an_seek(sc, ltv->an_type, 0, AN_BAP1))
		return EIO;

	/*
	 * Read the length and record type and make sure they
	 * match what we expect (this verifies that we have enough
	 * room to hold all of the returned data).
	 */
	len = CSR_READ_2(sc, AN_DATA1);
	if (len > ltv->an_len) {
		if (sc->arpcom.ec_if.if_flags & IFF_DEBUG)
			printf("%s: RID 0x%04x record length mismatch"
			    "-- expected %d, got %d\n", sc->an_dev.dv_xname,
			    ltv->an_type, ltv->an_len, len);
		return ENOSPC;
	}

	ltv->an_len = len;

	/* Now read the data. */
	ptr = &ltv->an_val;
	for (i = 0; i < (ltv->an_len - 2) >> 1; i++)
		ptr[i] = CSR_READ_2(sc, AN_DATA1);

	return 0;
}

/*
 * Same as read, except we inject data instead of reading it.
 */
static int
an_write_record(struct an_softc *sc, struct an_ltv_gen *ltv)
{
	u_int16_t *ptr;
	int i;

	if (an_cmd(sc, AN_CMD_ACCESS|AN_ACCESS_READ, ltv->an_type))
		return EIO;

	if (an_seek(sc, ltv->an_type, 0, AN_BAP1))
		return EIO;

	CSR_WRITE_2(sc, AN_DATA1, ltv->an_len-2);
	
	ptr = &ltv->an_val;
	for (i = 0; i < (ltv->an_len - 4) >> 1; i++)
		CSR_WRITE_2(sc, AN_DATA1, ptr[i]);

	if (an_cmd(sc, AN_CMD_ACCESS|AN_ACCESS_WRITE, ltv->an_type))
		return EIO;

	return 0;
}

static int
an_seek(struct an_softc *sc, int id, int off, int chan)
{
	int i, selreg, offreg;

	switch (chan) {
	case AN_BAP0:
		selreg = AN_SEL0;
		offreg = AN_OFF0;
		break;
	case AN_BAP1:
		selreg = AN_SEL1;
		offreg = AN_OFF1;
		break;
	default:
		panic("%s: invalid chan: %x\n", sc->an_dev.dv_xname, chan);
	}

	CSR_WRITE_2(sc, selreg, id);
	CSR_WRITE_2(sc, offreg, off);

	for (i = 0; i < AN_TIMEOUT; i++) {
		if (!(CSR_READ_2(sc, offreg) & (AN_OFF_BUSY|AN_OFF_ERR)))
			break;
		DELAY(10);
	}
	if (i == AN_TIMEOUT) {
		if (sc->arpcom.ec_if.if_flags & IFF_DEBUG)
			printf("%s: seek(0x%x, 0x%x, 0x%x) timeout\n",
			    sc->an_dev.dv_xname, id, off, chan);
		return ETIMEDOUT;
	}

	return 0;
}

static int
an_read_data(struct an_softc *sc, int id, int off, caddr_t buf, int len)
{
	int i;
	u_int16_t *ptr;
	u_int8_t *ptr2;

	if (off != -1) {
		if (an_seek(sc, id, off, AN_BAP1))
			return EIO;
	}

	ptr = (u_int16_t *)buf;
	for (i = 0; i < len / 2; i++)
		ptr[i] = CSR_READ_2(sc, AN_DATA1);
	i *= 2;
	if (i < len){
	        ptr2 = (u_int8_t *)buf;
	        ptr2[i] = CSR_READ_1(sc, AN_DATA1);
	}

	return 0;
}

static int
an_write_data(struct an_softc *sc, int id, int off, caddr_t buf, int len)
{
	int i;
	u_int16_t *ptr;
	u_int8_t *ptr2;

	if (off != -1) {
		if (an_seek(sc, id, off, AN_BAP0))
			return EIO;
	}

	ptr = (u_int16_t *)buf;
	for (i = 0; i < (len / 2); i++)
		CSR_WRITE_2(sc, AN_DATA0, ptr[i]);
	i *= 2;
	if (i < len){
	        ptr2 = (u_int8_t *)buf;
	        CSR_WRITE_1(sc, AN_DATA0, ptr2[i]);
	}

	return 0;
}

/*
 * Allocate a region of memory inside the NIC and zero
 * it out.
 */
static int
an_alloc_nicmem(struct an_softc *sc, int len, int *id)
{
	int			i;

	if (an_cmd(sc, AN_CMD_ALLOC_MEM, len)) {
		printf("%s: failed to allocate %d bytes on NIC\n",
		    sc->an_dev.dv_xname, len);
		return ENOMEM;
	}

	for (i = 0; i < AN_TIMEOUT; i++) {
		if (CSR_READ_2(sc, AN_EVENT_STAT) & AN_EV_ALLOC)
			break;
		DELAY(10);
	}

	if (i == AN_TIMEOUT)
		return(ETIMEDOUT);

	CSR_WRITE_2(sc, AN_EVENT_ACK, AN_EV_ALLOC);
	*id = CSR_READ_2(sc, AN_ALLOC_FID);

	if (an_seek(sc, *id, 0, AN_BAP0))
		return EIO;

	for (i = 0; i < len / 2; i++)
		CSR_WRITE_2(sc, AN_DATA0, 0);

	return 0;
}

#ifdef ANCACHE
/* Aironet signal strength cache code.
 * store signal/noise/quality on per MAC src basis in
 * a small fixed cache.  The cache wraps if > MAX slots
 * used.  The cache may be zeroed out to start over.
 * Two simple filters exist to reduce computation:
 * 1. ip only (literally 0x800) which may be used
 * to ignore some packets.  It defaults to ip only.
 * it could be used to focus on broadcast, non-IP 802.11 beacons.
 * 2. multicast/broadcast only.  This may be used to
 * ignore unicast packets and only cache signal strength
 * for multicast/broadcast packets (beacons); e.g., Mobile-IP
 * beacons and not unicast traffic.
 *
 * The cache stores (MAC src(index), IP src (major clue), signal,
 *	quality, noise)
 *
 * No apologies for storing IP src here.  It's easy and saves much
 * trouble elsewhere.  The cache is assumed to be INET dependent, 
 * although it need not be.
 *
 * Note: the Aironet only has a single byte of signal strength value
 * in the rx frame header, and it's not scaled to anything sensible.
 * This is kind of lame, but it's all we've got.
 */

#ifdef documentation

int an_sigitems;                                /* number of cached entries */
struct an_sigcache an_sigcache[MAXANCACHE];  /*  array of cache entries */
int an_nextitem;                                /*  index/# of entries */


#endif

/* control variables for cache filtering.  Basic idea is
 * to reduce cost (e.g., to only Mobile-IP agent beacons
 * which are broadcast or multicast).  Still you might
 * want to measure signal strength anth unicast ping packets
 * on a pt. to pt. ant. setup.
 */
/* set true if you want to limit cache items to broadcast/mcast 
 * only packets (not unicast).  Useful for mobile-ip beacons which
 * are broadcast/multicast at network layer.  Default is all packets
 * so ping/unicast anll work say anth pt. to pt. antennae setup.
 */
static int an_cache_mcastonly = 0;
#if 0
SYSCTL_INT(_machdep, OID_AUTO, an_cache_mcastonly, CTLFLAG_RW, 
	&an_cache_mcastonly, 0, "");
#endif

/* set true if you want to limit cache items to IP packets only
*/
static int an_cache_iponly = 1;
#if 0
SYSCTL_INT(_machdep, OID_AUTO, an_cache_iponly, CTLFLAG_RW, 
	&an_cache_iponly, 0, "");
#endif

/*
 * an_cache_store, per rx packet store signal
 * strength in MAC (src) indexed cache.
 */
static  
void an_cache_store (sc, eh, m, rx_quality)
	struct an_softc *sc;
	struct ether_header *eh;
	struct mbuf *m;
	unsigned short rx_quality;
{
	struct ip *ip = 0; 
	int i;
	static int cache_slot = 0; 	/* use this cache entry */
	static int wrapindex = 0;       /* next "free" cache entry */
	int saanp=0;

	/* filters:
	 * 1. ip only
	 * 2. configurable filter to throw out unicast packets,
	 * keep multicast only.
	 */
 
	if ((ntohs(eh->ether_type) == 0x800)) {
		saanp = 1;
	}

	/* filter for ip packets only 
	*/
	if (an_cache_iponly && !saanp) {
		return;
	}

	/* filter for broadcast/multicast only
	 */
	if (an_cache_mcastonly && ((eh->ether_dhost[0] & 1) == 0)) {
		return;
	}

#ifdef SIGDEBUG
	printf("an: q value %x (MSB=0x%x, LSB=0x%x) \n",
	    rx_quality & 0xffff, rx_quality >> 8, rx_quality & 0xff);
#endif

	/* find the ip header.  we want to store the ip_src
	 * address.  
	 */
	if (saanp) {
		ip = (struct ip *)(mtod(m, caddr_t) + 14);
	}
        
	/* do a linear search for a matching MAC address 
	 * in the cache table
	 * . MAC address is 6 bytes,
	 * . var w_nextitem holds total number of entries already cached
	 */
	for(i = 0; i < sc->an_nextitem; i++) {
		if (!memcmp(eh->ether_shost , sc->an_sigcache[i].macsrc,  6 )) {
			/* Match!,
			 * so we already have this entry,
			 * update the data
			 */
			break;	
		}
	}

	/* did we find a matching mac address?
	 * if yes, then overwrite a previously existing cache entry
	 */
	if (i < sc->an_nextitem )   {
		cache_slot = i; 
	}
	/* else, have a new address entry,so
	 * add this new entry,
	 * if table full, then we need to replace LRU entry
	 */
	else    {                          

		/* check for space in cache table 
		 * note: an_nextitem also holds number of entries
		 * added in the cache table 
		 */
		if (sc->an_nextitem < MAXANCACHE ) {
			cache_slot = sc->an_nextitem;
			sc->an_nextitem++;                 
			sc->an_sigitems = sc->an_nextitem;
		}
        	/* no space found, so simply wrap anth wrap index
		 * and "zap" the next entry
		 */
		else {
			if (wrapindex == MAXANCACHE) {
				wrapindex = 0;
			}
			cache_slot = wrapindex++;
		}
	}

	/* invariant: cache_slot now points at some slot
	 * in cache.
	 */
	if (cache_slot < 0 || cache_slot >= MAXANCACHE) {
		log(LOG_ERR, "an_cache_store, bad index: %d of "
		    "[0..%d], gross cache error\n",
		    cache_slot, MAXANCACHE);
		return;
	}

	/*  store items in cache
	 *  .ip source address
	 *  .mac src
	 *  .signal, etc.
	 */
	if (saanp) {
		sc->an_sigcache[cache_slot].ipsrc = ip->ip_src.s_addr;
	}
	memcpy(sc->an_sigcache[cache_slot].macsrc, eh->ether_shost, 6);

	sc->an_sigcache[cache_slot].signal = rx_quality;

	return;
}
#endif