Move files to match FreeBSD layout

1 files changed, 1086 insertions, 0 deletions

diff --git a/freebsd/sys/net/if_tap.c b/freebsd/sys/net/if_tap.c
new file mode 100644
index 00000000..206302bb
--- /dev/null
+++ b/freebsd/sys/net/if_tap.c
@@ -0,0 +1,1086 @@
+#include <freebsd/machine/rtems-bsd-config.h>
+
+/*-
+ * Copyright (C) 1999-2000 by Maksim Yevmenkin <m_evmenkin@yahoo.com>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR OR CONTRIBUTORS 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.
+ *
+ * BASED ON:
+ * -------------------------------------------------------------------------
+ *
+ * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk>
+ * Nottingham University 1987.
+ */
+
+/*
+ * $FreeBSD$
+ * $Id: if_tap.c,v 0.21 2000/07/23 21:46:02 max Exp $
+ */
+
+#include <freebsd/local/opt_compat.h>
+#include <freebsd/local/opt_inet.h>
+
+#include <freebsd/sys/param.h>
+#include <freebsd/sys/conf.h>
+#include <freebsd/sys/fcntl.h>
+#include <freebsd/sys/filio.h>
+#include <freebsd/sys/kernel.h>
+#include <freebsd/sys/malloc.h>
+#include <freebsd/sys/mbuf.h>
+#include <freebsd/sys/module.h>
+#include <freebsd/sys/poll.h>
+#include <freebsd/sys/priv.h>
+#include <freebsd/sys/proc.h>
+#include <freebsd/sys/selinfo.h>
+#include <freebsd/sys/signalvar.h>
+#include <freebsd/sys/socket.h>
+#include <freebsd/sys/sockio.h>
+#include <freebsd/sys/sysctl.h>
+#include <freebsd/sys/systm.h>
+#include <freebsd/sys/ttycom.h>
+#include <freebsd/sys/uio.h>
+#include <freebsd/sys/queue.h>
+
+#include <freebsd/net/bpf.h>
+#include <freebsd/net/ethernet.h>
+#include <freebsd/net/if.h>
+#include <freebsd/net/if_clone.h>
+#include <freebsd/net/if_dl.h>
+#include <freebsd/net/route.h>
+#include <freebsd/net/if_types.h>
+
+#include <freebsd/netinet/in.h>
+
+#include <freebsd/net/if_tapvar.h>
+#include <freebsd/net/if_tap.h>
+
+
+#define CDEV_NAME	"tap"
+#define TAPDEBUG	if (tapdebug) printf
+
+#define TAP		"tap"
+#define VMNET		"vmnet"
+#define TAPMAXUNIT	0x7fff
+#define VMNET_DEV_MASK	CLONE_FLAG0
+
+/* module */
+static int		tapmodevent(module_t, int, void *);
+
+/* device */
+static void		tapclone(void *, struct ucred *, char *, int,
+			    struct cdev **);
+static void		tapcreate(struct cdev *);
+
+/* network interface */
+static void		tapifstart(struct ifnet *);
+static int		tapifioctl(struct ifnet *, u_long, caddr_t);
+static void		tapifinit(void *);
+
+static int		tap_clone_create(struct if_clone *, int, caddr_t);
+static void		tap_clone_destroy(struct ifnet *);
+static int		vmnet_clone_create(struct if_clone *, int, caddr_t);
+static void		vmnet_clone_destroy(struct ifnet *);
+
+IFC_SIMPLE_DECLARE(tap, 0);
+IFC_SIMPLE_DECLARE(vmnet, 0);
+
+/* character device */
+static d_open_t		tapopen;
+static d_close_t	tapclose;
+static d_read_t		tapread;
+static d_write_t	tapwrite;
+static d_ioctl_t	tapioctl;
+static d_poll_t		tappoll;
+static d_kqfilter_t	tapkqfilter;
+
+/* kqueue(2) */
+static int		tapkqread(struct knote *, long);
+static int		tapkqwrite(struct knote *, long);
+static void		tapkqdetach(struct knote *);
+
+static struct filterops	tap_read_filterops = {
+	.f_isfd =	1,
+	.f_attach =	NULL,
+	.f_detach =	tapkqdetach,
+	.f_event =	tapkqread,
+};
+
+static struct filterops	tap_write_filterops = {
+	.f_isfd =	1,
+	.f_attach =	NULL,
+	.f_detach =	tapkqdetach,
+	.f_event =	tapkqwrite,
+};
+
+static struct cdevsw	tap_cdevsw = {
+	.d_version =	D_VERSION,
+	.d_flags =	D_PSEUDO | D_NEEDMINOR,
+	.d_open =	tapopen,
+	.d_close =	tapclose,
+	.d_read =	tapread,
+	.d_write =	tapwrite,
+	.d_ioctl =	tapioctl,
+	.d_poll =	tappoll,
+	.d_name =	CDEV_NAME,
+	.d_kqfilter =	tapkqfilter,
+};
+
+/*
+ * All global variables in if_tap.c are locked with tapmtx, with the
+ * exception of tapdebug, which is accessed unlocked; tapclones is
+ * static at runtime.
+ */
+static struct mtx		tapmtx;
+static int			tapdebug = 0;        /* debug flag   */
+static int			tapuopen = 0;        /* allow user open() */
+static int			tapuponopen = 0;    /* IFF_UP on open() */
+static int			tapdclone = 1;	/* enable devfs cloning */
+static SLIST_HEAD(, tap_softc)	taphead;             /* first device */
+static struct clonedevs 	*tapclones;
+
+MALLOC_DECLARE(M_TAP);
+MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface");
+SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, "");
+
+SYSCTL_DECL(_net_link);
+SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0,
+    "Ethernet tunnel software network interface");
+SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0,
+	"Allow user to open /dev/tap (based on node permissions)");
+SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0,
+	"Bring interface up when /dev/tap is opened");
+SYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RW, &tapdclone, 0,
+	"Enably legacy devfs interface creation");
+SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, "");
+
+TUNABLE_INT("net.link.tap.devfs_cloning", &tapdclone);
+
+DEV_MODULE(if_tap, tapmodevent, NULL);
+
+static int
+tap_clone_create(struct if_clone *ifc, int unit, caddr_t params)
+{
+	struct cdev *dev;
+	int i;
+	int extra;
+
+	if (strcmp(ifc->ifc_name, VMNET) == 0)
+		extra = VMNET_DEV_MASK;
+	else
+		extra = 0;
+
+	/* find any existing device, or allocate new unit number */
+	i = clone_create(&tapclones, &tap_cdevsw, &unit, &dev, extra);
+	if (i) {
+		dev = make_dev(&tap_cdevsw, unit | extra,
+		     UID_ROOT, GID_WHEEL, 0600, "%s%d", ifc->ifc_name, unit);
+	}
+
+	tapcreate(dev);
+	return (0);
+}
+
+/* vmnet devices are tap devices in disguise */
+static int
+vmnet_clone_create(struct if_clone *ifc, int unit, caddr_t params)
+{
+	return tap_clone_create(ifc, unit, params);
+}
+
+static void
+tap_destroy(struct tap_softc *tp)
+{
+	struct ifnet *ifp = tp->tap_ifp;
+
+	/* Unlocked read. */
+	KASSERT(!(tp->tap_flags & TAP_OPEN),
+		("%s flags is out of sync", ifp->if_xname));
+
+	knlist_destroy(&tp->tap_rsel.si_note);
+	destroy_dev(tp->tap_dev);
+	ether_ifdetach(ifp);
+	if_free_type(ifp, IFT_ETHER);
+
+	mtx_destroy(&tp->tap_mtx);
+	free(tp, M_TAP);
+}
+
+static void
+tap_clone_destroy(struct ifnet *ifp)
+{
+	struct tap_softc *tp = ifp->if_softc;
+
+	mtx_lock(&tapmtx);
+	SLIST_REMOVE(&taphead, tp, tap_softc, tap_next);
+	mtx_unlock(&tapmtx);
+	tap_destroy(tp);
+}
+
+/* vmnet devices are tap devices in disguise */
+static void
+vmnet_clone_destroy(struct ifnet *ifp)
+{
+	tap_clone_destroy(ifp);
+}
+
+/*
+ * tapmodevent
+ *
+ * module event handler
+ */
+static int
+tapmodevent(module_t mod, int type, void *data)
+{
+	static eventhandler_tag	 eh_tag = NULL;
+	struct tap_softc	*tp = NULL;
+	struct ifnet		*ifp = NULL;
+
+	switch (type) {
+	case MOD_LOAD:
+
+		/* intitialize device */
+
+		mtx_init(&tapmtx, "tapmtx", NULL, MTX_DEF);
+		SLIST_INIT(&taphead);
+
+		clone_setup(&tapclones);
+		eh_tag = EVENTHANDLER_REGISTER(dev_clone, tapclone, 0, 1000);
+		if (eh_tag == NULL) {
+			clone_cleanup(&tapclones);
+			mtx_destroy(&tapmtx);
+			return (ENOMEM);
+		}
+		if_clone_attach(&tap_cloner);
+		if_clone_attach(&vmnet_cloner);
+		return (0);
+
+	case MOD_UNLOAD:
+		/*
+		 * The EBUSY algorithm here can't quite atomically
+		 * guarantee that this is race-free since we have to
+		 * release the tap mtx to deregister the clone handler.
+		 */
+		mtx_lock(&tapmtx);
+		SLIST_FOREACH(tp, &taphead, tap_next) {
+			mtx_lock(&tp->tap_mtx);
+			if (tp->tap_flags & TAP_OPEN) {
+				mtx_unlock(&tp->tap_mtx);
+				mtx_unlock(&tapmtx);
+				return (EBUSY);
+			}
+			mtx_unlock(&tp->tap_mtx);
+		}
+		mtx_unlock(&tapmtx);
+
+		EVENTHANDLER_DEREGISTER(dev_clone, eh_tag);
+		if_clone_detach(&tap_cloner);
+		if_clone_detach(&vmnet_cloner);
+		drain_dev_clone_events();
+
+		mtx_lock(&tapmtx);
+		while ((tp = SLIST_FIRST(&taphead)) != NULL) {
+			SLIST_REMOVE_HEAD(&taphead, tap_next);
+			mtx_unlock(&tapmtx);
+
+			ifp = tp->tap_ifp;
+
+			TAPDEBUG("detaching %s\n", ifp->if_xname);
+
+			tap_destroy(tp);
+			mtx_lock(&tapmtx);
+		}
+		mtx_unlock(&tapmtx);
+		clone_cleanup(&tapclones);
+
+		mtx_destroy(&tapmtx);
+
+		break;
+
+	default:
+		return (EOPNOTSUPP);
+	}
+
+	return (0);
+} /* tapmodevent */
+
+
+/*
+ * DEVFS handler
+ *
+ * We need to support two kind of devices - tap and vmnet
+ */
+static void
+tapclone(void *arg, struct ucred *cred, char *name, int namelen, struct cdev **dev)
+{
+	char		devname[SPECNAMELEN + 1];
+	int		i, unit, append_unit;
+	int		extra;
+
+	if (*dev != NULL)
+		return;
+
+	if (!tapdclone ||
+	    (!tapuopen && priv_check_cred(cred, PRIV_NET_IFCREATE, 0) != 0))
+		return;
+
+	unit = 0;
+	append_unit = 0;
+	extra = 0;
+
+	/* We're interested in only tap/vmnet devices. */
+	if (strcmp(name, TAP) == 0) {
+		unit = -1;
+	} else if (strcmp(name, VMNET) == 0) {
+		unit = -1;
+		extra = VMNET_DEV_MASK;
+	} else if (dev_stdclone(name, NULL, TAP, &unit) != 1) {
+		if (dev_stdclone(name, NULL, VMNET, &unit) != 1) {
+			return;
+		} else {
+			extra = VMNET_DEV_MASK;
+		}
+	}
+
+	if (unit == -1)
+		append_unit = 1;
+
+	/* find any existing device, or allocate new unit number */
+	i = clone_create(&tapclones, &tap_cdevsw, &unit, dev, extra);
+	if (i) {
+		if (append_unit) {
+			/*
+			 * We were passed 'tun' or 'tap', with no unit specified
+			 * so we'll need to append it now.
+			 */
+			namelen = snprintf(devname, sizeof(devname), "%s%d", name,
+			    unit);
+			name = devname;
+		}
+
+		*dev = make_dev_credf(MAKEDEV_REF, &tap_cdevsw, unit | extra,
+		     cred, UID_ROOT, GID_WHEEL, 0600, "%s", name);
+	}
+
+	if_clone_create(name, namelen, NULL);
+} /* tapclone */
+
+
+/*
+ * tapcreate
+ *
+ * to create interface
+ */
+static void
+tapcreate(struct cdev *dev)
+{
+	struct ifnet		*ifp = NULL;
+	struct tap_softc	*tp = NULL;
+	unsigned short		 macaddr_hi;
+	uint32_t		 macaddr_mid;
+	int			 unit;
+	char			*name = NULL;
+	u_char			eaddr[6];
+
+	dev->si_flags &= ~SI_CHEAPCLONE;
+
+	/* allocate driver storage and create device */
+	tp = malloc(sizeof(*tp), M_TAP, M_WAITOK | M_ZERO);
+	mtx_init(&tp->tap_mtx, "tap_mtx", NULL, MTX_DEF);
+	mtx_lock(&tapmtx);
+	SLIST_INSERT_HEAD(&taphead, tp, tap_next);
+	mtx_unlock(&tapmtx);
+
+	unit = dev2unit(dev);
+
+	/* select device: tap or vmnet */
+	if (unit & VMNET_DEV_MASK) {
+		name = VMNET;
+		tp->tap_flags |= TAP_VMNET;
+	} else
+		name = TAP;
+
+	unit &= TAPMAXUNIT;
+
+	TAPDEBUG("tapcreate(%s%d). minor = %#x\n", name, unit, dev2unit(dev));
+
+	/* generate fake MAC address: 00 bd xx xx xx unit_no */
+	macaddr_hi = htons(0x00bd);
+	macaddr_mid = (uint32_t) ticks;
+	bcopy(&macaddr_hi, eaddr, sizeof(short));
+	bcopy(&macaddr_mid, &eaddr[2], sizeof(uint32_t));
+	eaddr[5] = (u_char)unit;
+
+	/* fill the rest and attach interface */
+	ifp = tp->tap_ifp = if_alloc(IFT_ETHER);
+	if (ifp == NULL)
+		panic("%s%d: can not if_alloc()", name, unit);
+	ifp->if_softc = tp;
+	if_initname(ifp, name, unit);
+	ifp->if_init = tapifinit;
+	ifp->if_start = tapifstart;
+	ifp->if_ioctl = tapifioctl;
+	ifp->if_mtu = ETHERMTU;
+	ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST);
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_capabilities |= IFCAP_LINKSTATE;
+	ifp->if_capenable |= IFCAP_LINKSTATE;
+
+	dev->si_drv1 = tp;
+	tp->tap_dev = dev;
+
+	ether_ifattach(ifp, eaddr);
+
+	mtx_lock(&tp->tap_mtx);
+	tp->tap_flags |= TAP_INITED;
+	mtx_unlock(&tp->tap_mtx);
+
+	knlist_init_mtx(&tp->tap_rsel.si_note, &tp->tap_mtx);
+
+	TAPDEBUG("interface %s is created. minor = %#x\n",
+		ifp->if_xname, dev2unit(dev));
+} /* tapcreate */
+
+
+/*
+ * tapopen
+ *
+ * to open tunnel. must be superuser
+ */
+static int
+tapopen(struct cdev *dev, int flag, int mode, struct thread *td)
+{
+	struct tap_softc	*tp = NULL;
+	struct ifnet		*ifp = NULL;
+	int			 error;
+
+	if (tapuopen == 0) {
+		error = priv_check(td, PRIV_NET_TAP);
+		if (error)
+			return (error);
+	}
+
+	if ((dev2unit(dev) & CLONE_UNITMASK) > TAPMAXUNIT)
+		return (ENXIO);
+
+	tp = dev->si_drv1;
+
+	mtx_lock(&tp->tap_mtx);
+	if (tp->tap_flags & TAP_OPEN) {
+		mtx_unlock(&tp->tap_mtx);
+		return (EBUSY);
+	}
+
+	bcopy(IF_LLADDR(tp->tap_ifp), tp->ether_addr, sizeof(tp->ether_addr));
+	tp->tap_pid = td->td_proc->p_pid;
+	tp->tap_flags |= TAP_OPEN;
+	ifp = tp->tap_ifp;
+
+	ifp->if_drv_flags |= IFF_DRV_RUNNING;
+	ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
+	if (tapuponopen)
+		ifp->if_flags |= IFF_UP;
+	if_link_state_change(ifp, LINK_STATE_UP);
+	mtx_unlock(&tp->tap_mtx);
+
+	TAPDEBUG("%s is open. minor = %#x\n", ifp->if_xname, dev2unit(dev));
+
+	return (0);
+} /* tapopen */
+
+
+/*
+ * tapclose
+ *
+ * close the device - mark i/f down & delete routing info
+ */
+static int
+tapclose(struct cdev *dev, int foo, int bar, struct thread *td)
+{
+	struct ifaddr		*ifa;
+	struct tap_softc	*tp = dev->si_drv1;
+	struct ifnet		*ifp = tp->tap_ifp;
+
+	/* junk all pending output */
+	mtx_lock(&tp->tap_mtx);
+	IF_DRAIN(&ifp->if_snd);
+
+	/*
+	 * do not bring the interface down, and do not anything with
+	 * interface, if we are in VMnet mode. just close the device.
+	 */
+
+	if (((tp->tap_flags & TAP_VMNET) == 0) && (ifp->if_flags & IFF_UP)) {
+		mtx_unlock(&tp->tap_mtx);
+		if_down(ifp);
+		mtx_lock(&tp->tap_mtx);
+		if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
+			ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
+			mtx_unlock(&tp->tap_mtx);
+			TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
+				rtinit(ifa, (int)RTM_DELETE, 0);
+			}
+			if_purgeaddrs(ifp);
+			mtx_lock(&tp->tap_mtx);
+		}
+	}
+
+	if_link_state_change(ifp, LINK_STATE_DOWN);
+	funsetown(&tp->tap_sigio);
+	selwakeuppri(&tp->tap_rsel, PZERO+1);
+	KNOTE_LOCKED(&tp->tap_rsel.si_note, 0);
+
+	tp->tap_flags &= ~TAP_OPEN;
+	tp->tap_pid = 0;
+	mtx_unlock(&tp->tap_mtx);
+
+	TAPDEBUG("%s is closed. minor = %#x\n",
+		ifp->if_xname, dev2unit(dev));
+
+	return (0);
+} /* tapclose */
+
+
+/*
+ * tapifinit
+ *
+ * network interface initialization function
+ */
+static void
+tapifinit(void *xtp)
+{
+	struct tap_softc	*tp = (struct tap_softc *)xtp;
+	struct ifnet		*ifp = tp->tap_ifp;
+
+	TAPDEBUG("initializing %s\n", ifp->if_xname);
+
+	mtx_lock(&tp->tap_mtx);
+	ifp->if_drv_flags |= IFF_DRV_RUNNING;
+	ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
+	mtx_unlock(&tp->tap_mtx);
+
+	/* attempt to start output */
+	tapifstart(ifp);
+} /* tapifinit */
+
+
+/*
+ * tapifioctl
+ *
+ * Process an ioctl request on network interface
+ */
+static int
+tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
+{
+	struct tap_softc	*tp = ifp->if_softc;
+	struct ifreq		*ifr = (struct ifreq *)data;
+	struct ifstat		*ifs = NULL;
+	int			 dummy;
+
+	switch (cmd) {
+		case SIOCSIFFLAGS: /* XXX -- just like vmnet does */
+		case SIOCADDMULTI:
+		case SIOCDELMULTI:
+			break;
+
+		case SIOCSIFMTU:
+			ifp->if_mtu = ifr->ifr_mtu;
+			break;
+
+		case SIOCGIFSTATUS:
+			ifs = (struct ifstat *)data;
+			dummy = strlen(ifs->ascii);
+			mtx_lock(&tp->tap_mtx);
+			if (tp->tap_pid != 0 && dummy < sizeof(ifs->ascii))
+				snprintf(ifs->ascii + dummy,
+					sizeof(ifs->ascii) - dummy,
+					"\tOpened by PID %d\n", tp->tap_pid);
+			mtx_unlock(&tp->tap_mtx);
+			break;
+
+		default:
+			return (ether_ioctl(ifp, cmd, data));
+			/* NOT REACHED */
+	}
+
+	return (0);
+} /* tapifioctl */
+
+
+/*
+ * tapifstart
+ *
+ * queue packets from higher level ready to put out
+ */
+static void
+tapifstart(struct ifnet *ifp)
+{
+	struct tap_softc	*tp = ifp->if_softc;
+
+	TAPDEBUG("%s starting\n", ifp->if_xname);
+
+	/*
+	 * do not junk pending output if we are in VMnet mode.
+	 * XXX: can this do any harm because of queue overflow?
+	 */
+
+	mtx_lock(&tp->tap_mtx);
+	if (((tp->tap_flags & TAP_VMNET) == 0) &&
+	    ((tp->tap_flags & TAP_READY) != TAP_READY)) {
+		struct mbuf *m;
+
+		/* Unlocked read. */
+		TAPDEBUG("%s not ready, tap_flags = 0x%x\n", ifp->if_xname,
+		    tp->tap_flags);
+
+		for (;;) {
+			IF_DEQUEUE(&ifp->if_snd, m);
+			if (m != NULL) {
+				m_freem(m);
+				ifp->if_oerrors++;
+			} else
+				break;
+		}
+		mtx_unlock(&tp->tap_mtx);
+
+		return;
+	}
+
+	ifp->if_drv_flags |= IFF_DRV_OACTIVE;
+
+	if (!IFQ_IS_EMPTY(&ifp->if_snd)) {
+		if (tp->tap_flags & TAP_RWAIT) {
+			tp->tap_flags &= ~TAP_RWAIT;
+			wakeup(tp);
+		}
+
+		if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) {
+			mtx_unlock(&tp->tap_mtx);
+			pgsigio(&tp->tap_sigio, SIGIO, 0);
+			mtx_lock(&tp->tap_mtx);
+		}
+
+		selwakeuppri(&tp->tap_rsel, PZERO+1);
+		KNOTE_LOCKED(&tp->tap_rsel.si_note, 0);
+		ifp->if_opackets ++; /* obytes are counted in ether_output */
+	}
+
+	ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
+	mtx_unlock(&tp->tap_mtx);
+} /* tapifstart */
+
+
+/*
+ * tapioctl
+ *
+ * the cdevsw interface is now pretty minimal
+ */
+static int
+tapioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
+{
+	struct tap_softc	*tp = dev->si_drv1;
+	struct ifnet		*ifp = tp->tap_ifp;
+	struct tapinfo		*tapp = NULL;
+	int			 f;
+#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
+    defined(COMPAT_FREEBSD4)
+	int			 ival;
+#endif
+
+	switch (cmd) {
+		case TAPSIFINFO:
+			tapp = (struct tapinfo *)data;
+			mtx_lock(&tp->tap_mtx);
+			ifp->if_mtu = tapp->mtu;
+			ifp->if_type = tapp->type;
+			ifp->if_baudrate = tapp->baudrate;
+			mtx_unlock(&tp->tap_mtx);
+			break;
+
+		case TAPGIFINFO:
+			tapp = (struct tapinfo *)data;
+			mtx_lock(&tp->tap_mtx);
+			tapp->mtu = ifp->if_mtu;
+			tapp->type = ifp->if_type;
+			tapp->baudrate = ifp->if_baudrate;
+			mtx_unlock(&tp->tap_mtx);
+			break;
+
+		case TAPSDEBUG:
+			tapdebug = *(int *)data;
+			break;
+
+		case TAPGDEBUG:
+			*(int *)data = tapdebug;
+			break;
+
+		case TAPGIFNAME: {
+			struct ifreq	*ifr = (struct ifreq *) data;
+
+			strlcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ);
+			} break;
+
+		case FIONBIO:
+			break;
+
+		case FIOASYNC:
+			mtx_lock(&tp->tap_mtx);
+			if (*(int *)data)
+				tp->tap_flags |= TAP_ASYNC;
+			else
+				tp->tap_flags &= ~TAP_ASYNC;
+			mtx_unlock(&tp->tap_mtx);
+			break;
+
+		case FIONREAD:
+			if (!IFQ_IS_EMPTY(&ifp->if_snd)) {
+				struct mbuf *mb;
+
+				IFQ_LOCK(&ifp->if_snd);
+				IFQ_POLL_NOLOCK(&ifp->if_snd, mb);
+				for (*(int *)data = 0; mb != NULL;
+				     mb = mb->m_next)
+					*(int *)data += mb->m_len;
+				IFQ_UNLOCK(&ifp->if_snd);
+			} else
+				*(int *)data = 0;
+			break;
+
+		case FIOSETOWN:
+			return (fsetown(*(int *)data, &tp->tap_sigio));
+
+		case FIOGETOWN:
+			*(int *)data = fgetown(&tp->tap_sigio);
+			return (0);
+
+		/* this is deprecated, FIOSETOWN should be used instead */
+		case TIOCSPGRP:
+			return (fsetown(-(*(int *)data), &tp->tap_sigio));
+
+		/* this is deprecated, FIOGETOWN should be used instead */
+		case TIOCGPGRP:
+			*(int *)data = -fgetown(&tp->tap_sigio);
+			return (0);
+
+		/* VMware/VMnet port ioctl's */
+
+#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
+    defined(COMPAT_FREEBSD4)
+		case _IO('V', 0):
+			ival = IOCPARM_IVAL(data);
+			data = (caddr_t)&ival;
+			/* FALLTHROUGH */
+#endif
+		case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */
+			f = *(int *)data;
+			f &= 0x0fff;
+			f &= ~IFF_CANTCHANGE;
+			f |= IFF_UP;
+
+			mtx_lock(&tp->tap_mtx);
+			ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE);
+			mtx_unlock(&tp->tap_mtx);
+			break;
+
+		case OSIOCGIFADDR:	/* get MAC address of the remote side */
+		case SIOCGIFADDR:
+			mtx_lock(&tp->tap_mtx);
+			bcopy(tp->ether_addr, data, sizeof(tp->ether_addr));
+			mtx_unlock(&tp->tap_mtx);
+			break;
+
+		case SIOCSIFADDR:	/* set MAC address of the remote side */
+			mtx_lock(&tp->tap_mtx);
+			bcopy(data, tp->ether_addr, sizeof(tp->ether_addr));
+			mtx_unlock(&tp->tap_mtx);
+			break;
+
+		default:
+			return (ENOTTY);
+	}
+	return (0);
+} /* tapioctl */
+
+
+/*
+ * tapread
+ *
+ * the cdevsw read interface - reads a packet at a time, or at
+ * least as much of a packet as can be read
+ */
+static int
+tapread(struct cdev *dev, struct uio *uio, int flag)
+{
+	struct tap_softc	*tp = dev->si_drv1;
+	struct ifnet		*ifp = tp->tap_ifp;
+	struct mbuf		*m = NULL;
+	int			 error = 0, len;
+
+	TAPDEBUG("%s reading, minor = %#x\n", ifp->if_xname, dev2unit(dev));
+
+	mtx_lock(&tp->tap_mtx);
+	if ((tp->tap_flags & TAP_READY) != TAP_READY) {
+		mtx_unlock(&tp->tap_mtx);
+
+		/* Unlocked read. */
+		TAPDEBUG("%s not ready. minor = %#x, tap_flags = 0x%x\n",
+			ifp->if_xname, dev2unit(dev), tp->tap_flags);
+
+		return (EHOSTDOWN);
+	}
+
+	tp->tap_flags &= ~TAP_RWAIT;
+
+	/* sleep until we get a packet */
+	do {
+		IF_DEQUEUE(&ifp->if_snd, m);
+
+		if (m == NULL) {
+			if (flag & O_NONBLOCK) {
+				mtx_unlock(&tp->tap_mtx);
+				return (EWOULDBLOCK);
+			}
+
+			tp->tap_flags |= TAP_RWAIT;
+			error = mtx_sleep(tp, &tp->tap_mtx, PCATCH | (PZERO + 1),
+			    "taprd", 0);
+			if (error) {
+				mtx_unlock(&tp->tap_mtx);
+				return (error);
+			}
+		}
+	} while (m == NULL);
+	mtx_unlock(&tp->tap_mtx);
+
+	/* feed packet to bpf */
+	BPF_MTAP(ifp, m);
+
+	/* xfer packet to user space */
+	while ((m != NULL) && (uio->uio_resid > 0) && (error == 0)) {
+		len = min(uio->uio_resid, m->m_len);
+		if (len == 0)
+			break;
+
+		error = uiomove(mtod(m, void *), len, uio);
+		m = m_free(m);
+	}
+
+	if (m != NULL) {
+		TAPDEBUG("%s dropping mbuf, minor = %#x\n", ifp->if_xname,
+			dev2unit(dev));
+		m_freem(m);
+	}
+
+	return (error);
+} /* tapread */
+
+
+/*
+ * tapwrite
+ *
+ * the cdevsw write interface - an atomic write is a packet - or else!
+ */
+static int
+tapwrite(struct cdev *dev, struct uio *uio, int flag)
+{
+	struct ether_header	*eh;
+	struct tap_softc	*tp = dev->si_drv1;
+	struct ifnet		*ifp = tp->tap_ifp;
+	struct mbuf		*m;
+
+	TAPDEBUG("%s writting, minor = %#x\n",
+		ifp->if_xname, dev2unit(dev));
+
+	if (uio->uio_resid == 0)
+		return (0);
+
+	if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) {
+		TAPDEBUG("%s invalid packet len = %zd, minor = %#x\n",
+			ifp->if_xname, uio->uio_resid, dev2unit(dev));
+
+		return (EIO);
+	}
+
+	if ((m = m_uiotombuf(uio, M_DONTWAIT, 0, ETHER_ALIGN,
+	    M_PKTHDR)) == NULL) {
+		ifp->if_ierrors ++;
+		return (ENOBUFS);
+	}
+
+	m->m_pkthdr.rcvif = ifp;
+
+	/*
+	 * Only pass a unicast frame to ether_input(), if it would actually
+	 * have been received by non-virtual hardware.
+	 */
+	if (m->m_len < sizeof(struct ether_header)) {
+		m_freem(m);
+		return (0);
+	}
+	eh = mtod(m, struct ether_header *);
+
+	if (eh && (ifp->if_flags & IFF_PROMISC) == 0 &&
+	    !ETHER_IS_MULTICAST(eh->ether_dhost) &&
+	    bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) {
+		m_freem(m);
+		return (0);
+	}
+
+	/* Pass packet up to parent. */
+	(*ifp->if_input)(ifp, m);
+	ifp->if_ipackets ++; /* ibytes are counted in parent */
+
+	return (0);
+} /* tapwrite */
+
+
+/*
+ * tappoll
+ *
+ * the poll interface, this is only useful on reads
+ * really. the write detect always returns true, write never blocks
+ * anyway, it either accepts the packet or drops it
+ */
+static int
+tappoll(struct cdev *dev, int events, struct thread *td)
+{
+	struct tap_softc	*tp = dev->si_drv1;
+	struct ifnet		*ifp = tp->tap_ifp;
+	int			 revents = 0;
+
+	TAPDEBUG("%s polling, minor = %#x\n",
+		ifp->if_xname, dev2unit(dev));
+
+	if (events & (POLLIN | POLLRDNORM)) {
+		IFQ_LOCK(&ifp->if_snd);
+		if (!IFQ_IS_EMPTY(&ifp->if_snd)) {
+			TAPDEBUG("%s have data in queue. len = %d, " \
+				"minor = %#x\n", ifp->if_xname,
+				ifp->if_snd.ifq_len, dev2unit(dev));
+
+			revents |= (events & (POLLIN | POLLRDNORM));
+		} else {
+			TAPDEBUG("%s waiting for data, minor = %#x\n",
+				ifp->if_xname, dev2unit(dev));
+
+			selrecord(td, &tp->tap_rsel);
+		}
+		IFQ_UNLOCK(&ifp->if_snd);
+	}
+
+	if (events & (POLLOUT | POLLWRNORM))
+		revents |= (events & (POLLOUT | POLLWRNORM));
+
+	return (revents);
+} /* tappoll */
+
+
+/*
+ * tap_kqfilter
+ *
+ * support for kevent() system call
+ */
+static int
+tapkqfilter(struct cdev *dev, struct knote *kn)
+{
+	struct tap_softc	*tp = dev->si_drv1;
+	struct ifnet		*ifp = tp->tap_ifp;
+
+	switch (kn->kn_filter) {
+	case EVFILT_READ:
+		TAPDEBUG("%s kqfilter: EVFILT_READ, minor = %#x\n",
+			ifp->if_xname, dev2unit(dev));
+		kn->kn_fop = &tap_read_filterops;
+		break;
+
+	case EVFILT_WRITE:
+		TAPDEBUG("%s kqfilter: EVFILT_WRITE, minor = %#x\n",
+			ifp->if_xname, dev2unit(dev));
+		kn->kn_fop = &tap_write_filterops;
+		break;
+
+	default:
+		TAPDEBUG("%s kqfilter: invalid filter, minor = %#x\n",
+			ifp->if_xname, dev2unit(dev));
+		return (EINVAL);
+		/* NOT REACHED */
+	}
+
+	kn->kn_hook = tp;
+	knlist_add(&tp->tap_rsel.si_note, kn, 0);
+
+	return (0);
+} /* tapkqfilter */
+
+
+/*
+ * tap_kqread
+ * 
+ * Return true if there is data in the interface queue
+ */
+static int
+tapkqread(struct knote *kn, long hint)
+{
+	int			 ret;
+	struct tap_softc	*tp = kn->kn_hook;
+	struct cdev		*dev = tp->tap_dev;
+	struct ifnet		*ifp = tp->tap_ifp;
+
+	if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) {
+		TAPDEBUG("%s have data in queue. len = %d, minor = %#x\n",
+			ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev));
+		ret = 1;
+	} else {
+		TAPDEBUG("%s waiting for data, minor = %#x\n",
+			ifp->if_xname, dev2unit(dev));
+		ret = 0;
+	}
+
+	return (ret);
+} /* tapkqread */
+
+
+/*
+ * tap_kqwrite
+ *
+ * Always can write. Return the MTU in kn->data
+ */
+static int
+tapkqwrite(struct knote *kn, long hint)
+{
+	struct tap_softc	*tp = kn->kn_hook;
+	struct ifnet		*ifp = tp->tap_ifp;
+
+	kn->kn_data = ifp->if_mtu;
+
+	return (1);
+} /* tapkqwrite */
+
+
+static void
+tapkqdetach(struct knote *kn)
+{
+	struct tap_softc	*tp = kn->kn_hook;
+
+	knlist_remove(&tp->tap_rsel.si_note, kn, 0);
+} /* tapkqdetach */
+