an.c

访问基于802.1x认证方式的网络

/*	$OpenBSD: an.c,v 1.23 2002/03/14 01:26:54 millert Exp $	*/

/*
 * Copyright (c) 1997, 1998, 1999
 *	Bill Paul <[e-mail]>.  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 1.21 2001/09/10 02:05:09 brooks Exp $
 */

/*
 * Aironet 4500/4800 802.11 PCMCIA/ISA/PCI driver for FreeBSD.
 *
 * Written by Bill Paul <[e-mail]>
 * 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.
 */

#ifdef INET
#define ANCACHE			/* enable signal strength cache */
#endif

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

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

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

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

#include <machine/bus.h>
#include <machine/intr.h>

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

#define TIMEOUT(handle,func,sc,time) timeout_add(&(handle), (time))
#define UNTIMEOUT(func,sc,handle) timeout_del(&(handle))
#define BPF_MTAP(if,mbuf) bpf_mtap((if)->if_bpf, (mbuf))
#define BPFATTACH(if_bpf,if,dlt,sz)

struct cfdriver an_cd = {
	NULL, "an", DV_IFNET
};

void an_reset(struct an_softc *);
int an_ioctl(struct ifnet *, u_long, caddr_t);
int an_init_tx_ring(struct an_softc *);
void an_start(struct ifnet *);
void an_watchdog(struct ifnet *);
void an_rxeof(struct an_softc *);
void an_txeof(struct an_softc *, int);

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

static __inline void
an_swap16(u_int16_t *p, int cnt)
{
	for (; cnt--; p++)
		*p = swap16(*p);
}

int
an_attach(sc)
	struct an_softc *sc;
{
	struct ifnet	*ifp = &sc->arpcom.ac_if;

	sc->an_gone = 0;
	sc->an_associated = 0;

	/* disable interrupts */
	CSR_WRITE_2(sc, AN_INT_EN, 0);
	CSR_WRITE_2(sc, AN_EVENT_ACK, 0xffff);

	/* Reset the NIC. */
	an_reset(sc);

	/* Load factory config */
	if (an_cmd(sc, AN_CMD_READCFG, 0)) {
		printf("%s: failed to load config data\n", ifp->if_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)) {
		printf("%s: read record failed\n", ifp->if_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)) {
		printf("%s: read record failed\n", ifp->if_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)) {
		printf("%s: read record failed\n", ifp->if_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)) {
		printf("%s: read record failed\n", ifp->if_xname);
		return(EIO);
	}

	bcopy((char *)&sc->an_caps.an_oemaddr,
	   (char *)&sc->arpcom.ac_enaddr, ETHER_ADDR_LEN);

	printf(": address %6s\n", ether_sprintf(sc->arpcom.ac_enaddr));

	bcopy(sc->sc_dev.dv_xname, ifp->if_xname, IFNAMSIZ);
	ifp->if_softc = sc;
	ifp->if_mtu = ETHERMTU;
	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
	ifp->if_ioctl = an_ioctl;
	ifp->if_start = an_start;
	ifp->if_watchdog = an_watchdog;
	ifp->if_baudrate = 10000000;
	IFQ_SET_READY(&ifp->if_snd);

	bzero(sc->an_config.an_nodename, sizeof(sc->an_config.an_nodename));
	bcopy(AN_DEFAULT_NODENAME, sc->an_config.an_nodename,
	    sizeof(AN_DEFAULT_NODENAME) - 1);

	bzero(sc->an_ssidlist.an_ssid1, sizeof(sc->an_ssidlist.an_ssid1));
	bcopy(AN_DEFAULT_NETNAME, sc->an_ssidlist.an_ssid1,
	    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;
	bzero((char *)&sc->an_stats, sizeof(sc->an_stats));
#ifdef ANCACHE
	sc->an_sigitems = sc->an_nextitem = 0;
#endif

	ifmedia_init(&sc->an_ifmedia, 0, an_media_change, an_media_status);
#define	ADD(m, c)	ifmedia_add(&sc->an_ifmedia, (m), (c), NULL)
	ADD(IFM_MAKEWORD(IFM_IEEE80211, IFM_IEEE80211_DS1,
	    IFM_IEEE80211_ADHOC, 0), 0);
	ADD(IFM_MAKEWORD(IFM_IEEE80211, IFM_IEEE80211_DS1, 0, 0), 0);
	ADD(IFM_MAKEWORD(IFM_IEEE80211, IFM_IEEE80211_DS2,
	    IFM_IEEE80211_ADHOC, 0), 0);
	ADD(IFM_MAKEWORD(IFM_IEEE80211, IFM_IEEE80211_DS2, 0, 0), 0);
	if (sc->an_caps.an_rates[2] == AN_RATE_5_5MBPS) {
		ADD(IFM_MAKEWORD(IFM_IEEE80211, IFM_IEEE80211_DS5,
		    IFM_IEEE80211_ADHOC, 0), 0);
		ADD(IFM_MAKEWORD(IFM_IEEE80211, IFM_IEEE80211_DS5, 0, 0), 0);
	}
	if (sc->an_caps.an_rates[3] == AN_RATE_11MBPS) {
		ADD(IFM_MAKEWORD(IFM_IEEE80211, IFM_IEEE80211_DS11,
		    IFM_IEEE80211_ADHOC, 0), 0);
		ADD(IFM_MAKEWORD(IFM_IEEE80211, IFM_IEEE80211_DS11, 0, 0), 0);
	}
	ADD(IFM_MAKEWORD(IFM_IEEE80211, IFM_AUTO,
	    IFM_IEEE80211_ADHOC, 0), 0);
	ADD(IFM_MAKEWORD(IFM_IEEE80211, IFM_AUTO, 0, 0), 0);
#undef ADD
	ifmedia_set(&sc->an_ifmedia, IFM_MAKEWORD(IFM_IEEE80211, IFM_AUTO,
	    0, 0));

	/*
	 * Call MI attach routines.
	 */
	if_attach(ifp);
	ether_ifattach(ifp);
	timeout_set(&sc->an_stat_ch, an_stats_update, sc);
#if NBPFILTER > 0
	BPFATTACH(&sc->arpcom.ac_if.if_bpf, ifp, DLT_EN10MB,
	    sizeof(struct ether_header));
#endif

	shutdownhook_establish(an_shutdown, sc);

	an_reset(sc);
	an_init(sc);

	return(0);
}

void
an_rxeof(sc)
	struct an_softc	 *sc;
{
	struct ifnet		*ifp;
	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;

	ifp = &sc->arpcom.ac_if;

	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;

	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, 0x34, (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 (letoh16(rx_frame_802_3.an_rx_802_3_payload_len) > MCLBYTES) {
		ifp->if_ierrors++;
		return;
	}

	m->m_pkthdr.len = m->m_len =
	    letoh16(rx_frame_802_3.an_rx_802_3_payload_len) + 12;

	bcopy((char *)&rx_frame_802_3.an_rx_dst_addr,
	    (char *)&eh->ether_dhost, ETHER_ADDR_LEN);
	bcopy((char *)&rx_frame_802_3.an_rx_src_addr,
	    (char *)&eh->ether_shost, ETHER_ADDR_LEN);

	/* in mbuf header type is just before payload */
	error = an_read_data(sc, id, 0x44, (caddr_t)&(eh->ether_type),
			     letoh16(rx_frame_802_3.an_rx_802_3_payload_len));
	if (error) {
		m_freem(m);
		ifp->if_ierrors++;
		return;
	}

	ifp->if_ipackets++;

#if NBPFILTER > 0
	/* Handle BPF listeners. */
	if (ifp->if_bpf)
		BPF_MTAP(ifp, m);
#endif

	/* Receive packet. */
#ifdef ANCACHE
	an_cache_store(sc, eh, m, rx_frame.an_rx_signal_strength);
#endif
	ether_input_mbuf(ifp, m);
}

void
an_txeof(sc, status)
	struct an_softc	*sc;
	int		status;
{
	struct ifnet	*ifp;
	int		id;

	ifp = &sc->arpcom.ac_if;

	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++;

	if (id != sc->an_rdata.an_tx_ring[sc->an_rdata.an_tx_cons])
		printf("%s: id mismatch: expected %x, got %x\n", ifp->if_xname,
		    sc->an_rdata.an_tx_ring[sc->an_rdata.an_tx_cons], id);

	sc->an_rdata.an_tx_ring[sc->an_rdata.an_tx_cons] = 0;
	AN_INC(sc->an_rdata.an_tx_cons, AN_TX_RING_CNT);
}

/*
 * 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(xsc)
	void			*xsc;
{
	struct an_softc		*sc;
	struct ifnet		*ifp;
	int			s;

	s = splimp();

	sc = xsc;
	ifp = &sc->arpcom.ac_if;

	sc->an_status.an_type = AN_RID_STATUS;
	sc->an_status.an_len = sizeof(struct an_ltv_status);
	an_read_record(sc, (struct an_ltv_gen *)&sc->an_status);

	if (sc->an_status.an_opmode & AN_STATUS_OPMODE_IN_SYNC)
		sc->an_associated = 1;
	else
		sc->an_associated = 0;

	/* Don't do this while we're transmitting */
	if (!(ifp->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);
	}

	splx(s);
	TIMEOUT(sc->an_stat_ch, an_stats_update, sc, hz);
}

int
an_intr(xsc)
	void	*xsc;
{
	struct an_softc		*sc;
	struct ifnet		*ifp;
	u_int16_t		status;

	sc = (struct an_softc*)xsc;

	if (sc->an_gone)
		return 0;

	ifp = &sc->arpcom.ac_if;

	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);

	status = CSR_READ_2(sc, AN_EVENT_STAT);
	CSR_WRITE_2(sc, AN_EVENT_ACK, ~AN_INTRS);

	if (status & AN_EV_AWAKE) {
		CSR_WRITE_2(sc, AN_EVENT_ACK, AN_EV_AWAKE);
	}

	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);
	}

	if (status & AN_EV_RX) {
		an_rxeof(sc);
		CSR_WRITE_2(sc, AN_EVENT_ACK, AN_EV_RX);
	}

	if (status & AN_EV_TX) {
		an_txeof(sc, status);
		CSR_WRITE_2(sc, AN_EVENT_ACK, AN_EV_TX);
	}

	if (status & AN_EV_TX_EXC) {
		an_txeof(sc, status);
		CSR_WRITE_2(sc, AN_EVENT_ACK, AN_EV_TX_EXC);
	}

	if (status & AN_EV_ALLOC)
		CSR_WRITE_2(sc, AN_EVENT_ACK, AN_EV_ALLOC);

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

	if (!IFQ_IS_EMPTY(&ifp->if_snd))
		an_start(ifp);

	return 1;
}

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

	/* make sure previous command completed */
	if (CSR_READ_2(sc, AN_COMMAND) & AN_CMD_BUSY) {
		printf("%s: command busy\n", sc->sc_dev.dv_xname);
		CSR_WRITE_2(sc, AN_EVENT_ACK, AN_EV_CLR_STUCK_BUSY);
	}