if_an.c

访问基于802.1x认证方式的网络

/*
 * 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 1.2.2.8 2001/09/26 01:02:01 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.
 */

#include "opt_inet.h"

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

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

#include <sys/module.h>
#include <sys/sysctl.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>

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

#include <net/bpf.h>

#include <machine/clock.h>
#include <machine/md_var.h>

#include <dev/an/if_aironet_ieee.h>
#include <dev/an/if_anreg.h>

#if !defined(lint)
static const char rcsid[] =
  "$FreeBSD: src/sys/dev/an/if_an.c,v 1.2.2.8 2001/09/26 01:02:01 brooks Exp $";
#endif

/* These are global because we need them in sys/pci/if_an_p.c. */
static void an_reset		__P((struct an_softc *));
static int an_ioctl		__P((struct ifnet *, u_long, caddr_t));
static void an_init		__P((void *));
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 void an_promisc		__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 void 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

static void an_dump_record	__P((struct an_softc *,struct an_ltv_gen *,
				    char *));

static int an_media_change	__P((struct ifnet *));
static void an_media_status	__P((struct ifnet *, struct ifmediareq *));

static int	an_dump = 0;
static char an_conf[256];

/* sysctl vars */
SYSCTL_NODE(_machdep, OID_AUTO, an, CTLFLAG_RD, 0, "dump RID");

static int
sysctl_an_dump(SYSCTL_HANDLER_ARGS)
{
	int	error, r, last;
	char 	*s = an_conf;

	last = an_dump;
	bzero(an_conf, sizeof(an_conf));

	switch (an_dump) {
	case 0:
		strcat(an_conf, "off");
		break;
	case 1:
		strcat(an_conf, "type");
		break;
	case 2:
		strcat(an_conf, "dump");
		break;
	default:
		snprintf(an_conf, 5, "%x", an_dump);
		break;
	}

	error = sysctl_handle_string(oidp, an_conf, sizeof(an_conf), req);

	if (strncmp(an_conf,"off", 4) == 0) {
		an_dump = 0;
 	}
	if (strncmp(an_conf,"dump", 4) == 0) {
		an_dump = 1;
	}
	if (strncmp(an_conf,"type", 4) == 0) {
		an_dump = 2;
	}
	if (*s == 'f') {
		r = 0;
		for (;;s++) {
			if ((*s >= '0') && (*s <= '9')) {
				r = r * 16 + (*s - '0');
			} else if ((*s >= 'a') && (*s <= 'f')) {
				r = r * 16 + (*s - 'a' + 10);
			} else {
				break;
			}
		}
		an_dump = r;
	}
	if (an_dump != last)
		printf("Sysctl changed for Aironet driver\n");

	return error;
}

SYSCTL_PROC(_machdep, OID_AUTO, an_dump, CTLTYPE_STRING | CTLFLAG_RW,
            0, sizeof(an_conf), sysctl_an_dump, "A", "");

/*
 * We probe for an Aironet 4500/4800 card by attempting to
 * read the default SSID list. On reset, the first entry in
 * the SSID list will contain the name "tsunami." If we don't
 * find this, then there's no card present.
 */
int
an_probe(dev)
	device_t		dev;
{
        struct an_softc *sc = device_get_softc(dev);
	struct an_ltv_ssidlist	ssid;
	int	error;

	bzero((char *)&ssid, sizeof(ssid));

	error = an_alloc_port(dev, 0, AN_IOSIZ);
	if (error != 0)
		return (0);

	/* can't do autoprobing */
	if (rman_get_start(sc->port_res) == -1)
		return(0);

	/*
	 * We need to fake up a softc structure long enough
	 * to be able to issue commands and call some of the
	 * other routines.
	 */
	sc->an_bhandle = rman_get_bushandle(sc->port_res);
	sc->an_btag = rman_get_bustag(sc->port_res);
	sc->an_unit = device_get_unit(dev);

	ssid.an_len = sizeof(ssid);
	ssid.an_type = AN_RID_SSIDLIST;

        /* Make sure interrupts are disabled. */
        CSR_WRITE_2(sc, AN_INT_EN, 0);
        CSR_WRITE_2(sc, AN_EVENT_ACK, 0xFFFF);

	an_reset(sc);

	if (an_cmd(sc, AN_CMD_READCFG, 0))
		return(0);

	if (an_read_record(sc, (struct an_ltv_gen *)&ssid))
		return(0);

	/* See if the ssid matches what we expect ... but doesn't have to */
	if (strcmp(ssid.an_ssid1, AN_DEF_SSID))
		return(0);

	return(AN_IOSIZ);
}

/*
 * Allocate a port resource with the given resource id.
 */
int
an_alloc_port(dev, rid, size)
	device_t dev;
	int rid;
	int size;
{
	struct an_softc *sc = device_get_softc(dev);
	struct resource *res;

	res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
				 0ul, ~0ul, size, RF_ACTIVE);
	if (res) {
		sc->port_rid = rid;
		sc->port_res = res;
		return (0);
	} else {
		return (ENOENT);
	}
}

/*
 * Allocate an irq resource with the given resource id.
 */
int
an_alloc_irq(dev, rid, flags)
	device_t dev;
	int rid;
	int flags;
{
	struct an_softc *sc = device_get_softc(dev);
	struct resource *res;

	res = bus_alloc_resource(dev, SYS_RES_IRQ, &rid,
				 0ul, ~0ul, 1, (RF_ACTIVE | flags));
	if (res) {
		sc->irq_rid = rid;
		sc->irq_res = res;
		return (0);
	} else {
		return (ENOENT);
	}
}

/*
 * Release all resources
 */
void
an_release_resources(dev)
	device_t dev;
{
	struct an_softc *sc = device_get_softc(dev);

	if (sc->port_res) {
		bus_release_resource(dev, SYS_RES_IOPORT,
				     sc->port_rid, sc->port_res);
		sc->port_res = 0;
	}
	if (sc->irq_res) {
		bus_release_resource(dev, SYS_RES_IRQ,
				     sc->irq_rid, sc->irq_res);
		sc->irq_res = 0;
	}
}

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

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

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

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

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

	printf("an%d: Ethernet address: %6D\n", sc->an_unit,
	    sc->arpcom.ac_enaddr, ":");

	ifp->if_softc = sc;
	ifp->if_unit = sc->an_unit = unit;
	ifp->if_name = "an";
	ifp->if_mtu = ETHERMTU;
	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
	ifp->if_ioctl = an_ioctl;
	ifp->if_output = ether_output;
	ifp->if_start = an_start;
	ifp->if_watchdog = an_watchdog;
	ifp->if_init = an_init;
	ifp->if_baudrate = 10000000;
	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;

	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));

	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 routine.
	 */
	ether_ifattach(ifp, ETHER_BPF_SUPPORTED);
	callout_handle_init(&sc->an_stat_ch);

	return(0);
}

static void
an_rxeof(sc)
	struct an_softc *sc;
{
	struct ifnet   *ifp;
	struct ether_header *eh;
	struct ieee80211_frame *ih;
	struct an_rxframe rx_frame;
	struct an_rxframe_802_3 rx_frame_802_3;
	struct mbuf    *m;
	int             len, id, error = 0;
	int             ieee80211_header_len;
	u_char          *bpf_buf;
	u_short         fc1;

	ifp = &sc->arpcom.ac_if;

	id = CSR_READ_2(sc, AN_RX_FID);

	if (sc->an_monitor && (ifp->if_flags & IFF_PROMISC)) {
		/* read raw 802.11 packet */
	        bpf_buf = sc->buf_802_11;

		/* read header */
		if (an_read_data(sc, id, 0x0, (caddr_t)&rx_frame,
				 sizeof(rx_frame))) {
			ifp->if_ierrors++;
			return;
		}

		/*
		 * skip beacon by default since this increases the
		 * system load a lot
		 */

		if (!(sc->an_monitor & AN_MONITOR_INCLUDE_BEACON) &&
		    (rx_frame.an_frame_ctl & IEEE80211_FC0_SUBTYPE_BEACON)) {
			return;
		}

		if (sc->an_monitor & AN_MONITOR_AIRONET_HEADER) {
			len = rx_frame.an_rx_payload_len
				+ sizeof(rx_frame);
			/* Check for insane frame length */
			if (len > sizeof(sc->buf_802_11)) {
				printf("an%d: oversized packet received (%d, %d)\n",
				       sc->an_unit, len, MCLBYTES);
				ifp->if_ierrors++;
				return;
			}

			bcopy((char *)&rx_frame,
			      bpf_buf, sizeof(rx_frame));

			error = an_read_data(sc, id, sizeof(rx_frame),
					     (caddr_t)bpf_buf+sizeof(rx_frame),
					     rx_frame.an_rx_payload_len);
		} else {
			fc1=rx_frame.an_frame_ctl >> 8;
			ieee80211_header_len = sizeof(struct ieee80211_frame);
			if ((fc1 & IEEE80211_FC1_DIR_TODS) &&
			    (fc1 & IEEE80211_FC1_DIR_FROMDS)) {
				ieee80211_header_len += ETHER_ADDR_LEN;
			}

			len = rx_frame.an_rx_payload_len
				+ ieee80211_header_len;
			/* Check for insane frame length */
			if (len > sizeof(sc->buf_802_11)) {
				printf("an%d: oversized packet received (%d, %d)\n",
				       sc->an_unit, len, MCLBYTES);
				ifp->if_ierrors++;
				return;
			}

			ih = (struct ieee80211_frame *)bpf_buf;

			bcopy((char *)&rx_frame.an_frame_ctl,
			      (char *)ih, ieee80211_header_len);

			error = an_read_data(sc, id, sizeof(rx_frame) +
					     rx_frame.an_gaplen,
					     (caddr_t)ih +ieee80211_header_len,
					     rx_frame.an_rx_payload_len);
		}
		/* dump raw 802.11 packet to bpf and skip ip stack */
		if (ifp->if_bpf != NULL) {
			bpf_tap(ifp, bpf_buf, len);
		}
	} else {