if_an.c

访问基于802.1x认证方式的网络

	}
out:
	splx(s);

	return(error != 0);
}

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

	if (sc->an_gone)
		return (0);

	for (i = 0; i < AN_TX_RING_CNT; i++) {
		if (an_alloc_nicmem(sc, 1518 +
		    0x44, &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 void
an_init(xsc)
	void			*xsc;
{
	struct an_softc		*sc = xsc;
	struct ifnet		*ifp = &sc->arpcom.ac_if;
	int			s;

	s = splimp();

	if (sc->an_gone) {
		splx(s);
		return;
	}

	if (ifp->if_flags & IFF_RUNNING)
		an_stop(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("an%d: tx buffer allocation "
			    "failed\n", sc->an_unit);
			splx(s);
			return;
		}
	}

	/* Set our MAC address. */
	bcopy((char *)&sc->arpcom.ac_enaddr,
	    (char *)&sc->an_config.an_macaddr, ETHER_ADDR_LEN);

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

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

	if (ifp->if_flags & IFF_PROMISC) {
		if (sc->an_monitor & AN_MONITOR) {
			if (sc->an_monitor & AN_MONITOR_ANY_BSS) {
				sc->an_config.an_rxmode |=
				    AN_RXMODE_80211_MONITOR_ANYBSS |
				    AN_RXMODE_NO_8023_HEADER;
			} else {
				sc->an_config.an_rxmode |=
				    AN_RXMODE_80211_MONITOR_CURBSS |
				    AN_RXMODE_NO_8023_HEADER;
			}
		}
	}

	/* 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("an%d: failed to set ssid list\n", sc->an_unit);
		splx(s);
		return;
	}

	/* 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("an%d: failed to set AP list\n", sc->an_unit);
		splx(s);
		return;
	}

	/* 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("an%d: failed to set configuration\n", sc->an_unit);
		splx(s);
		return;
	}

	/* Enable the MAC */
	if (an_cmd(sc, AN_CMD_ENABLE, 0)) {
		printf("an%d: failed to enable MAC\n", sc->an_unit);
		splx(s);
		return;
	}

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

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

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

	sc->an_stat_ch = timeout(an_stats_update, sc, hz);
	splx(s);

	return;
}

static void
an_start(ifp)
	struct ifnet		*ifp;
{
	struct an_softc		*sc;
	struct mbuf		*m0 = NULL;
	struct an_txframe_802_3	tx_frame_802_3;
	struct ether_header	*eh;
	int			id;
	int			idx;
	unsigned char           txcontrol;

	sc = ifp->if_softc;

	if (sc->an_gone)
		return;

	if (ifp->if_flags & IFF_OACTIVE)
		return;

	if (!sc->an_associated)
		return;

	if (sc->an_monitor && (ifp->if_flags & IFF_PROMISC)) {
		for (;;) {
			IF_DEQUEUE(&ifp->if_snd, m0);
			if (m0 == NULL)
				break;
		}
		return;
	}

	idx = sc->an_rdata.an_tx_prod;
	bzero((char *)&tx_frame_802_3, sizeof(tx_frame_802_3));

	while (sc->an_rdata.an_tx_ring[idx] == 0) {
		IF_DEQUEUE(&ifp->if_snd, m0);
		if (m0 == NULL)
			break;

		id = sc->an_rdata.an_tx_fids[idx];
		eh = mtod(m0, struct ether_header *);

		bcopy((char *)&eh->ether_dhost,
		    (char *)&tx_frame_802_3.an_tx_dst_addr, ETHER_ADDR_LEN);
		bcopy((char *)&eh->ether_shost,
		    (char *)&tx_frame_802_3.an_tx_src_addr, ETHER_ADDR_LEN);

		tx_frame_802_3.an_tx_802_3_payload_len =
		  m0->m_pkthdr.len - 12;  /* minus src/dest mac & type */

                m_copydata(m0, sizeof(struct ether_header) - 2 ,
                    tx_frame_802_3.an_tx_802_3_payload_len,
                    (caddr_t)&sc->an_txbuf);

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

		/* 802_3 header */
		an_write_data(sc, id, 0x34, (caddr_t)&tx_frame_802_3,
			      sizeof(struct an_txframe_802_3));

		/* in mbuf header type is just before payload */
		an_write_data(sc, id, 0x44, (caddr_t)&sc->an_txbuf,
			    tx_frame_802_3.an_tx_802_3_payload_len);

		/*
		 * If there's a BPF listner, bounce a copy of
		 * this frame to him.
		 */
		if (ifp->if_bpf)
			bpf_mtap(ifp, m0);

		m_freem(m0);
		m0 = NULL;

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

		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;

	return;
}

void
an_stop(sc)
	struct an_softc		*sc;
{
	struct ifnet		*ifp;
	int			i;
	int			s;

	s = splimp();

	if (sc->an_gone) {
		splx(s);
		return;
	}

	ifp = &sc->arpcom.ac_if;

	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]);

	untimeout(an_stats_update, sc, sc->an_stat_ch);

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

	splx(s);

	return;
}

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

	sc = ifp->if_softc;
	s = splimp();

	if (sc->an_gone) {
		splx(s);
		return;
	}

	printf("an%d: device timeout\n", sc->an_unit);

	an_reset(sc);
	an_init(sc);

	ifp->if_oerrors++;
	splx(s);

	return;
}

void
an_shutdown(dev)
	device_t		dev;
{
	struct an_softc		*sc;

	sc = device_get_softc(dev);
	an_stop(sc);

	return;
}

#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;
SYSCTL_INT(_machdep, OID_AUTO, an_cache_mcastonly, CTLFLAG_RW,
	&an_cache_mcastonly, 0, "");

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

/*
 * 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 = mtod(m, struct ip *);
	}

	/* 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 (! bcmp(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;
	}
	bcopy( eh->ether_shost, sc->an_sigcache[cache_slot].macsrc,  6);

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

	return;
}
#endif

static int
an_media_change(ifp)
	struct ifnet		*ifp;
{
	struct an_softc *sc = ifp->if_softc;
	int otype = sc->an_config.an_opmode;
	int orate = sc->an_tx_rate;

	if ((sc->an_ifmedia.ifm_cur->ifm_media & IFM_IEEE80211_ADHOC) != 0)
		sc->an_config.an_opmode = AN_OPMODE_IBSS_ADHOC;
	else
		sc->an_config.an_opmode = AN_OPMODE_INFRASTRUCTURE_STATION;

	switch (IFM_SUBTYPE(sc->an_ifmedia.ifm_cur->ifm_media)) {
	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;
	case IFM_AUTO:
		sc->an_tx_rate = 0;
		break;
	}

	if (otype != sc->an_config.an_opmode ||
	    orate != sc->an_tx_rate)
		an_init(sc);

	return(0);
}

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

	status.an_len = sizeof(status);
	status.an_type = AN_RID_STATUS;
	if (an_read_record(sc, (struct an_ltv_gen *)&status)) {
		/* If the status read fails, just lie. */
		imr->ifm_active = sc->an_ifmedia.ifm_cur->ifm_media;
		imr->ifm_status = IFM_AVALID|IFM_ACTIVE;
	}

	if (sc->an_tx_rate == 0) {
		imr->ifm_active = IFM_IEEE80211|IFM_AUTO;
		if (sc->an_config.an_opmode == AN_OPMODE_IBSS_ADHOC)
			imr->ifm_active |= IFM_IEEE80211_ADHOC;
		switch (status.an_current_tx_rate) {
		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;
		}
	} else {
		imr->ifm_active = sc->an_ifmedia.ifm_cur->ifm_media;
	}

	imr->ifm_status = IFM_AVALID;
	if (sc->an_config.an_opmode == AN_OPMODE_IBSS_ADHOC)
		imr->ifm_status |= IFM_ACTIVE;
	else if (status.an_opmode & AN_STATUS_OPMODE_ASSOCIATED)
			imr->ifm_status |= IFM_ACTIVE;
}