2 * Copyright (C) 1999-2000 by Maksim Yevmenkin <m_evmenkin@yahoo.com>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * -------------------------------------------------------------------------
29 * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk>
30 * Nottingham University 1987.
34 * $FreeBSD: src/sys/net/if_tap.c,v 1.3.2.3 2002/04/14 21:41:48 luigi Exp $
35 * $DragonFly: src/sys/net/tap/if_tap.c,v 1.41 2008/09/05 17:03:15 dillon Exp $
36 * $Id: if_tap.c,v 0.21 2000/07/23 21:46:02 max Exp $
41 #include <sys/param.h>
43 #include <sys/device.h>
44 #include <sys/filedesc.h>
45 #include <sys/filio.h>
46 #include <sys/kernel.h>
47 #include <sys/malloc.h>
52 #include <sys/signalvar.h>
53 #include <sys/socket.h>
54 #include <sys/sockio.h>
55 #include <sys/sysctl.h>
56 #include <sys/systm.h>
57 #include <sys/thread2.h>
58 #include <sys/ttycom.h>
60 #include <sys/vnode.h>
61 #include <sys/serialize.h>
64 #include <net/ethernet.h>
66 #include <net/ifq_var.h>
67 #include <net/if_arp.h>
68 #include <net/if_clone.h>
69 #include <net/route.h>
71 #include <netinet/in.h>
73 #include "if_tapvar.h"
76 #define TAP_IFFLAGS (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST)
78 #define CDEV_NAME "tap"
79 #define CDEV_MAJOR 149
80 #define TAPDEBUG if (tapdebug) if_printf
84 #define VMNET_DEV_MASK 0x00010000
87 static int tapmodevent (module_t, int, void *);
90 static void tapcreate (cdev_t);
91 static void tapdestroy(struct tap_softc *);
94 static int tap_clone_create(struct if_clone *, int);
95 static void tap_clone_destroy(struct ifnet *);
98 /* network interface */
99 static void tapifstart (struct ifnet *);
100 static int tapifioctl (struct ifnet *, u_long, caddr_t,
102 static void tapifinit (void *);
103 static void tapifstop(struct tap_softc *, int);
104 static void tapifflags(struct tap_softc *);
106 /* character device */
107 static d_open_t tapopen;
108 static d_close_t tapclose;
109 static d_read_t tapread;
110 static d_write_t tapwrite;
111 static d_ioctl_t tapioctl;
112 static d_poll_t tappoll;
113 static d_kqfilter_t tapkqfilter;
115 static struct dev_ops tap_ops = {
116 { CDEV_NAME, CDEV_MAJOR, 0 },
123 .d_kqfilter = tapkqfilter
126 static int taprefcnt = 0; /* module ref. counter */
127 static int taplastunit = -1; /* max. open unit number */
128 static int tapdebug = 0; /* debug flag */
129 static int tapuopen = 0; /* all user open() */
130 static int tapuponopen = 0; /* IFF_UP */
132 MALLOC_DECLARE(M_TAP);
133 MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface");
134 struct if_clone tap_cloner = IF_CLONE_INITIALIZER("tap",
135 tap_clone_create, tap_clone_destroy,
137 static SLIST_HEAD(,tap_softc) tap_listhead =
138 SLIST_HEAD_INITIALIZER(&tap_listhead);
140 SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, "");
141 SYSCTL_DECL(_net_link);
142 SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0,
143 "Ethernet tunnel software network interface");
144 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0,
145 "Allow user to open /dev/tap (based on node permissions)");
146 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0,
147 "Bring interface up when /dev/tap is opened");
148 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, "");
150 DEV_MODULE(if_tap, tapmodevent, NULL);
155 * module event handler
158 tapmodevent(module_t mod, int type, void *data)
160 static int attached = 0;
161 struct tap_softc *tp, *ntp;
168 dev_ops_add(&tap_ops, 0, 0);
169 SLIST_INIT(&tap_listhead);
170 if_clone_attach(&tap_cloner);
179 if_clone_detach(&tap_cloner);
180 dev_ops_remove(&tap_ops, 0, 0);
182 /* Maintain tap ifs in a local list */
183 SLIST_FOREACH_MUTABLE(tp, &tap_listhead, tap_link, ntp)
200 * to create interface
203 tapcreate(cdev_t dev)
205 struct ifnet *ifp = NULL;
206 struct tap_softc *tp = NULL;
207 uint8_t ether_addr[ETHER_ADDR_LEN];
211 /* allocate driver storage and create device */
212 MALLOC(tp, struct tap_softc *, sizeof(*tp), M_TAP, M_WAITOK | M_ZERO);
214 /* select device: tap or vmnet */
215 if (minor(dev) & VMNET_DEV_MASK) {
217 unit = lminor(dev) & 0xff;
218 tp->tap_flags |= TAP_VMNET;
225 tp->tap_dev = make_dev(&tap_ops, minor(dev), UID_ROOT, GID_WHEEL,
226 0600, "%s%d", name, unit);
227 tp->tap_dev->si_drv1 = dev->si_drv1 = tp;
228 reference_dev(tp->tap_dev); /* so we can destroy it later */
230 /* generate fake MAC address: 00 bd xx xx xx unit_no */
231 ether_addr[0] = 0x00;
232 ether_addr[1] = 0xbd;
233 bcopy(&ticks, ðer_addr[2], 3);
234 ether_addr[5] = (u_char)unit;
236 /* fill the rest and attach interface */
240 if_initname(ifp, name, unit);
241 if (unit > taplastunit)
244 ifp->if_init = tapifinit;
245 ifp->if_start = tapifstart;
246 ifp->if_ioctl = tapifioctl;
247 ifp->if_mtu = ETHERMTU;
248 ifp->if_flags = TAP_IFFLAGS;
249 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
250 ifq_set_ready(&ifp->if_snd);
252 ether_ifattach(ifp, ether_addr, NULL);
254 tp->tap_flags |= TAP_INITED;
255 tp->tap_devq.ifq_maxlen = ifqmaxlen;
257 SLIST_INSERT_HEAD(&tap_listhead, tp, tap_link);
259 TAPDEBUG(ifp, "created. minor = %#x\n", minor(tp->tap_dev));
265 * Create a new tap instance.
268 tap_clone_create(struct if_clone *ifc __unused, int unit)
270 struct tap_softc *tp = NULL;
273 dev = get_dev(CDEV_MAJOR, unit);
277 tp->tap_flags |= TAP_CLONE;
278 TAPDEBUG(&tp->tap_if, "clone created. minor = %#x tap_flags = 0x%x\n",
279 minor(tp->tap_dev), tp->tap_flags);
287 * to open tunnel. must be superuser
290 tapopen(struct dev_open_args *ap)
293 struct tap_softc *tp = NULL;
294 struct ifnet *ifp = NULL;
298 (error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) != 0)
302 dev = ap->a_head.a_dev;
307 ifp = &tp->arpcom.ac_if;
309 if (tp->tap_flags & TAP_OPEN) {
313 ifp = &tp->arpcom.ac_if;
315 if ((tp->tap_flags & TAP_CLONE) == 0) {
316 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
318 /* Announce the return of the interface. */
319 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
323 bcopy(tp->arpcom.ac_enaddr, tp->ether_addr, sizeof(tp->ether_addr));
325 if (curthread->td_proc)
326 fsetown(curthread->td_proc->p_pid, &tp->tap_sigtd);
327 tp->tap_flags |= TAP_OPEN;
330 if (tapuponopen && (ifp->if_flags & IFF_UP) == 0) {
335 ifnet_serialize_all(ifp);
337 ifnet_deserialize_all(ifp);
339 tp->tap_flags |= TAP_CLOSEDOWN;
342 TAPDEBUG(ifp, "opened. minor = %#x, refcnt = %d, taplastunit = %d\n",
343 minor(tp->tap_dev), taprefcnt, taplastunit);
353 * close the device - mark i/f down & delete routing info
356 tapclose(struct dev_close_args *ap)
358 cdev_t dev = ap->a_head.a_dev;
359 struct tap_softc *tp = dev->si_drv1;
360 struct ifnet *ifp = &tp->tap_if;
365 /* Junk all pending output */
366 ifq_purge(&ifp->if_snd);
369 * Do not bring the interface down, and do not anything with
370 * interface, if we are in VMnet mode. just close the device.
372 * If the interface is not cloned, we always bring it down.
374 * If the interface is cloned, then we bring it down during
375 * closing only if it was brought up during opening.
377 if ((tp->tap_flags & TAP_VMNET) == 0 &&
378 ((tp->tap_flags & TAP_CLONE) == 0 ||
379 (tp->tap_flags & TAP_CLOSEDOWN))) {
380 if (ifp->if_flags & IFF_UP)
384 ifnet_serialize_all(ifp);
385 tapifstop(tp, clear_flags);
386 ifnet_deserialize_all(ifp);
388 if ((tp->tap_flags & TAP_CLONE) == 0) {
389 if_purgeaddrs_nolink(ifp);
391 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
393 /* Announce the departure of the interface. */
394 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
397 funsetown(tp->tap_sigio);
398 tp->tap_sigio = NULL;
399 selwakeup(&tp->tap_rsel);
401 tp->tap_flags &= ~TAP_OPEN;
402 funsetown(tp->tap_sigtd);
403 tp->tap_sigtd = NULL;
408 if_printf(ifp, "minor = %#x, refcnt = %d is out of sync. "
409 "set refcnt to 0\n", minor(tp->tap_dev), taprefcnt);
412 TAPDEBUG(ifp, "closed. minor = %#x, refcnt = %d, taplastunit = %d\n",
413 minor(tp->tap_dev), taprefcnt, taplastunit);
416 if ((tp->tap_flags & TAP_CLONE) == 0)
427 * Destroy a tap instance.
430 tapdestroy(struct tap_softc *tp)
432 struct ifnet *ifp = &tp->arpcom.ac_if;
434 TAPDEBUG(ifp, "destroyed. minor = %#x, refcnt = %d, taplastunit = %d\n",
435 minor(tp->tap_dev), taprefcnt, taplastunit);
437 ifnet_serialize_all(ifp);
439 ifnet_deserialize_all(ifp);
442 SLIST_REMOVE(&tap_listhead, tp, tap_softc, tap_link);
444 destroy_dev(tp->tap_dev);
453 * Destroy a tap instance.
456 tap_clone_destroy(struct ifnet *ifp)
458 struct tap_softc *tp = ifp->if_softc;
460 TAPDEBUG(&tp->tap_if, "clone destroyed. minor = %#x tap_flags = 0x%x\n",
461 minor(tp->tap_dev), tp->tap_flags);
462 if (tp->tap_flags & TAP_CLONE)
469 * Network interface initialization function (called with if serializer held)
476 struct tap_softc *tp = xtp;
477 struct ifnet *ifp = &tp->tap_if;
479 TAPDEBUG(ifp, "initializing, minor = %#x tap_flags = 0x%x\n",
480 minor(tp->tap_dev), tp->tap_flags);
482 ASSERT_IFNET_SERIALIZED_ALL(ifp);
486 ifp->if_flags |= IFF_RUNNING;
487 ifp->if_flags &= ~IFF_OACTIVE;
489 /* attempt to start output */
497 * Process an ioctl request on network interface (called with if serializer
503 tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
505 struct tap_softc *tp = (struct tap_softc *)(ifp->if_softc);
506 struct ifstat *ifs = NULL;
513 dummy = ether_ioctl(ifp, cmd, data);
520 case SIOCADDMULTI: /* XXX -- just like vmnet does */
525 ifs = (struct ifstat *)data;
526 dummy = strlen(ifs->ascii);
527 if ((tp->tap_flags & TAP_OPEN) &&
528 dummy < sizeof(ifs->ascii)) {
529 if (tp->tap_sigtd && tp->tap_sigtd->sio_proc) {
530 ksnprintf(ifs->ascii + dummy,
531 sizeof(ifs->ascii) - dummy,
532 "\tOpened by pid %d\n",
533 (int)tp->tap_sigtd->sio_proc->p_pid);
535 ksnprintf(ifs->ascii + dummy,
536 sizeof(ifs->ascii) - dummy,
537 "\tOpened by <unknown>\n");
553 * Queue packets from higher level ready to put out (called with if serializer
559 tapifstart(struct ifnet *ifp)
561 struct tap_softc *tp = ifp->if_softc;
566 TAPDEBUG(ifp, "starting, minor = %#x\n", minor(tp->tap_dev));
569 * do not junk pending output if we are in VMnet mode.
570 * XXX: can this do any harm because of queue overflow?
573 if (((tp->tap_flags & TAP_VMNET) == 0) &&
574 ((tp->tap_flags & TAP_READY) != TAP_READY)) {
575 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
576 minor(tp->tap_dev), tp->tap_flags);
577 ifq_purge(&ifp->if_snd);
581 ifp->if_flags |= IFF_OACTIVE;
584 while ((m = ifq_dequeue(&ifp->if_snd, NULL)) != NULL) {
597 if (tp->tap_flags & TAP_RWAIT) {
598 tp->tap_flags &= ~TAP_RWAIT;
603 KNOTE(&tp->tap_rsel.si_note, 0);
606 if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) {
608 pgsigio(tp->tap_sigio, SIGIO, 0);
613 * selwakeup is not MPSAFE. tapifstart is.
616 selwakeup(&tp->tap_rsel);
620 ifp->if_flags &= ~IFF_OACTIVE;
627 * The ops interface is now pretty minimal. Called via fileops with nothing
633 tapioctl(struct dev_ioctl_args *ap)
635 cdev_t dev = ap->a_head.a_dev;
636 caddr_t data = ap->a_data;
637 struct tap_softc *tp = dev->si_drv1;
638 struct ifnet *ifp = &tp->tap_if;
639 struct tapinfo *tapp = NULL;
644 ifnet_serialize_all(ifp);
649 tapp = (struct tapinfo *)data;
650 ifp->if_mtu = tapp->mtu;
651 ifp->if_type = tapp->type;
652 ifp->if_baudrate = tapp->baudrate;
656 tapp = (struct tapinfo *)data;
657 tapp->mtu = ifp->if_mtu;
658 tapp->type = ifp->if_type;
659 tapp->baudrate = ifp->if_baudrate;
663 tapdebug = *(int *)data;
667 *(int *)data = tapdebug;
672 tp->tap_flags |= TAP_ASYNC;
674 tp->tap_flags &= ~TAP_ASYNC;
680 /* Take a look at devq first */
681 IF_POLL(&tp->tap_devq, mb);
683 mb = ifq_poll(&ifp->if_snd);
686 for(; mb != NULL; mb = mb->m_next)
687 *(int *)data += mb->m_len;
692 error = fsetown(*(int *)data, &tp->tap_sigio);
696 *(int *)data = fgetown(tp->tap_sigio);
699 /* this is deprecated, FIOSETOWN should be used instead */
701 error = fsetown(-(*(int *)data), &tp->tap_sigio);
704 /* this is deprecated, FIOGETOWN should be used instead */
706 *(int *)data = -fgetown(tp->tap_sigio);
709 /* VMware/VMnet port ioctl's */
711 case SIOCGIFFLAGS: /* get ifnet flags */
712 bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags));
715 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */
718 f &= ~IFF_CANTCHANGE;
720 ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE);
723 case OSIOCGIFADDR: /* get MAC address of the remote side */
725 bcopy(tp->ether_addr, data, sizeof(tp->ether_addr));
728 case SIOCSIFADDR: /* set MAC address of the remote side */
729 bcopy(data, tp->ether_addr, sizeof(tp->ether_addr));
736 ifnet_deserialize_all(ifp);
744 * The ops read interface - reads a packet at a time, or at
745 * least as much of a packet as can be read.
747 * Called from the fileops interface with nothing held.
752 tapread(struct dev_read_args *ap)
754 cdev_t dev = ap->a_head.a_dev;
755 struct uio *uio = ap->a_uio;
756 struct tap_softc *tp = dev->si_drv1;
757 struct ifnet *ifp = &tp->tap_if;
758 struct mbuf *m0 = NULL;
761 TAPDEBUG(ifp, "reading, minor = %#x\n", minor(tp->tap_dev));
763 if ((tp->tap_flags & TAP_READY) != TAP_READY) {
764 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
765 minor(tp->tap_dev), tp->tap_flags);
770 tp->tap_flags &= ~TAP_RWAIT;
772 /* sleep until we get a packet */
774 ifnet_serialize_all(ifp);
775 IF_DEQUEUE(&tp->tap_devq, m0);
777 if (ap->a_ioflag & IO_NDELAY) {
778 ifnet_deserialize_all(ifp);
779 return (EWOULDBLOCK);
781 tp->tap_flags |= TAP_RWAIT;
783 tsleep_interlock(tp);
784 ifnet_deserialize_all(ifp);
785 error = tsleep(tp, PCATCH, "taprd", 0);
790 ifnet_deserialize_all(ifp);
792 } while (m0 == NULL);
796 /* xfer packet to user space */
797 while ((m0 != NULL) && (uio->uio_resid > 0) && (error == 0)) {
798 len = min(uio->uio_resid, m0->m_len);
802 error = uiomove(mtod(m0, caddr_t), len, uio);
807 TAPDEBUG(ifp, "dropping mbuf, minor = %#x\n",
818 * The ops write interface - an atomic write is a packet - or else!
820 * Called from the fileops interface with nothing held.
825 tapwrite(struct dev_write_args *ap)
827 cdev_t dev = ap->a_head.a_dev;
828 struct uio *uio = ap->a_uio;
829 struct tap_softc *tp = dev->si_drv1;
830 struct ifnet *ifp = &tp->tap_if;
831 struct mbuf *top = NULL, **mp = NULL, *m = NULL;
832 int error = 0, tlen, mlen;
834 TAPDEBUG(ifp, "writing, minor = %#x\n", minor(tp->tap_dev));
836 if ((tp->tap_flags & TAP_READY) != TAP_READY) {
837 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
838 minor(tp->tap_dev), tp->tap_flags);
842 if (uio->uio_resid == 0)
845 if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) {
846 TAPDEBUG(ifp, "invalid packet len = %d, minor = %#x\n",
847 uio->uio_resid, minor(tp->tap_dev));
851 tlen = uio->uio_resid;
853 /* get a header mbuf */
854 MGETHDR(m, MB_DONTWAIT, MT_DATA);
861 while ((error == 0) && (uio->uio_resid > 0)) {
862 m->m_len = min(mlen, uio->uio_resid);
863 error = uiomove(mtod(m, caddr_t), m->m_len, uio);
866 if (uio->uio_resid > 0) {
867 MGET(m, MB_DONTWAIT, MT_DATA);
882 top->m_pkthdr.len = tlen;
883 top->m_pkthdr.rcvif = ifp;
886 * Ethernet bridge and bpf are handled in ether_input
888 * adjust mbuf and give packet to the ether_input
890 ifnet_serialize_all(ifp);
891 ifp->if_input(ifp, top);
892 ifp->if_ipackets ++; /* ibytes are counted in ether_input */
893 ifnet_deserialize_all(ifp);
901 * The poll interface, this is only useful on reads really. The write
902 * detect always returns true, write never blocks anyway, it either
903 * accepts the packet or drops it
905 * Called from the fileops interface with nothing held.
910 tappoll(struct dev_poll_args *ap)
912 cdev_t dev = ap->a_head.a_dev;
913 struct tap_softc *tp = dev->si_drv1;
914 struct ifnet *ifp = &tp->tap_if;
917 TAPDEBUG(ifp, "polling, minor = %#x\n", minor(tp->tap_dev));
919 if (ap->a_events & (POLLIN | POLLRDNORM)) {
920 if (!IF_QEMPTY(&tp->tap_devq)) {
922 "has data in queue. minor = %#x\n",
925 revents |= (ap->a_events & (POLLIN | POLLRDNORM));
927 TAPDEBUG(ifp, "waiting for data, minor = %#x\n",
931 selrecord(curthread, &tp->tap_rsel);
936 if (ap->a_events & (POLLOUT | POLLWRNORM))
937 revents |= (ap->a_events & (POLLOUT | POLLWRNORM));
938 ap->a_events = revents;
943 * tapkqfilter - called from the fileops interface with nothing held
947 static int filt_tapread(struct knote *kn, long hint);
948 static void filt_tapdetach(struct knote *kn);
949 static struct filterops tapread_filtops =
950 { 1, NULL, filt_tapdetach, filt_tapread };
953 tapkqfilter(struct dev_kqfilter_args *ap)
955 cdev_t dev = ap->a_head.a_dev;
956 struct knote *kn = ap->a_kn;
957 struct tap_softc *tp;
966 switch(kn->kn_filter) {
968 list = &tp->tap_rsel.si_note;
969 kn->kn_fop = &tapread_filtops;
970 kn->kn_hook = (void *)tp;
980 SLIST_INSERT_HEAD(list, kn, kn_selnext);
987 filt_tapread(struct knote *kn, long hint)
989 struct tap_softc *tp = (void *)kn->kn_hook;
991 if (IF_QEMPTY(&tp->tap_devq) == 0) /* XXX serializer */
998 filt_tapdetach(struct knote *kn)
1000 struct tap_softc *tp = (void *)kn->kn_hook;
1002 SLIST_REMOVE(&tp->tap_rsel.si_note, kn, knote, kn_selnext);
1006 tapifstop(struct tap_softc *tp, int clear_flags)
1008 struct ifnet *ifp = &tp->tap_if;
1010 ASSERT_IFNET_SERIALIZED_ALL(ifp);
1011 IF_DRAIN(&tp->tap_devq);
1012 tp->tap_flags &= ~TAP_CLOSEDOWN;
1014 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
1018 tapifflags(struct tap_softc *tp)
1020 struct ifnet *ifp = &tp->arpcom.ac_if;
1022 ASSERT_IFNET_SERIALIZED_ALL(ifp);
1023 if ((tp->tap_flags & TAP_VMNET) == 0) {
1025 * Only for non-vmnet tap(4)
1027 if (ifp->if_flags & IFF_UP) {
1028 if ((ifp->if_flags & IFF_RUNNING) == 0)