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 * $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>
51 #include <sys/signalvar.h>
52 #include <sys/socket.h>
53 #include <sys/sockio.h>
54 #include <sys/sysctl.h>
55 #include <sys/systm.h>
56 #include <sys/ttycom.h>
58 #include <sys/vnode.h>
59 #include <sys/serialize.h>
61 #include <sys/thread2.h>
62 #include <sys/mplock2.h>
65 #include <net/ethernet.h>
67 #include <net/ifq_var.h>
68 #include <net/if_arp.h>
69 #include <net/if_clone.h>
70 #include <net/if_media.h>
71 #include <net/route.h>
72 #include <sys/devfs.h>
74 #include <netinet/in.h>
76 #include "if_tapvar.h"
79 #define TAP_IFFLAGS (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST)
82 #define TAP_PREALLOCATED_UNITS 4
84 #define TAP_PREALLOCATED_UNITS NTAP
87 #define CDEV_NAME "tap"
88 #define TAPDEBUG if (tapdebug) if_printf
92 #define VMNET_DEV_MASK 0x00010000
94 DEVFS_DECLARE_CLONE_BITMAP(tap);
97 static int tapmodevent (module_t, int, void *);
100 static struct tap_softc *tapcreate(int, cdev_t, int);
101 static void tapdestroy(struct tap_softc *);
104 static int tap_clone_create(struct if_clone *, int, caddr_t);
105 static int tap_clone_destroy(struct ifnet *);
108 /* network interface */
109 static void tapifstart (struct ifnet *,
110 struct ifaltq_subque *);
111 static int tapifioctl (struct ifnet *, u_long, caddr_t,
113 static void tapifinit (void *);
114 static void tapifstop(struct tap_softc *, int);
115 static void tapifflags(struct tap_softc *);
118 /* character device */
119 static d_open_t tapopen;
120 static d_clone_t tapclone;
121 static d_close_t tapclose;
122 static d_read_t tapread;
123 static d_write_t tapwrite;
124 static d_ioctl_t tapioctl;
125 static d_kqfilter_t tapkqfilter;
127 static struct dev_ops tap_ops = {
134 .d_kqfilter = tapkqfilter
137 static int taprefcnt = 0; /* module ref. counter */
138 static int taplastunit = -1; /* max. open unit number */
139 static int tapdebug = 0; /* debug flag */
140 static int tapuopen = 0; /* all user open() */
141 static int tapuponopen = 0; /* IFF_UP */
143 MALLOC_DECLARE(M_TAP);
144 MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface");
145 struct if_clone tap_cloner = IF_CLONE_INITIALIZER("tap",
146 tap_clone_create, tap_clone_destroy,
148 static SLIST_HEAD(,tap_softc) tap_listhead =
149 SLIST_HEAD_INITIALIZER(&tap_listhead);
151 SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, "");
152 SYSCTL_DECL(_net_link);
153 SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0,
154 "Ethernet tunnel software network interface");
155 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0,
156 "Allow user to open /dev/tap (based on node permissions)");
157 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0,
158 "Bring interface up when /dev/tap is opened");
159 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, "");
161 DEV_MODULE(if_tap, tapmodevent, NULL);
166 * module event handler
169 tapmodevent(module_t mod, int type, void *data)
171 static int attached = 0;
172 struct tap_softc *tp, *ntp;
180 make_autoclone_dev(&tap_ops, &DEVFS_CLONE_BITMAP(tap), tapclone,
181 UID_ROOT, GID_WHEEL, 0600, "tap");
182 SLIST_INIT(&tap_listhead);
183 if_clone_attach(&tap_cloner);
185 for (i = 0; i < TAP_PREALLOCATED_UNITS; ++i) {
186 make_dev(&tap_ops, i, UID_ROOT, GID_WHEEL,
188 devfs_clone_bitmap_set(&DEVFS_CLONE_BITMAP(tap), i);
198 if_clone_detach(&tap_cloner);
200 /* Maintain tap ifs in a local list */
201 SLIST_FOREACH_MUTABLE(tp, &tap_listhead, tap_link, ntp)
206 devfs_clone_handler_del("tap");
207 dev_ops_remove_all(&tap_ops);
208 devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(tap));
220 * tapcreate - create or clone an interface
222 static struct tap_softc *
223 tapcreate(int unit, cdev_t dev, int flags)
225 const char *name = TAP;
227 struct tap_softc *tp;
228 uint8_t ether_addr[ETHER_ADDR_LEN];
230 tp = kmalloc(sizeof(*tp), M_TAP, M_WAITOK | M_ZERO);
234 tp->tap_flags |= flags;
236 reference_dev(dev); /* tp association */
238 /* generate fake MAC address: 00 bd xx xx xx unit_no */
239 ether_addr[0] = 0x00;
240 ether_addr[1] = 0xbd;
241 bcopy(&ticks, ðer_addr[2], 3);
242 ether_addr[5] = (u_char)unit;
244 /* fill the rest and attach interface */
248 if_initname(ifp, name, unit);
249 if (unit > taplastunit)
252 ifp->if_init = tapifinit;
253 ifp->if_start = tapifstart;
254 ifp->if_ioctl = tapifioctl;
255 ifp->if_mtu = ETHERMTU;
256 ifp->if_flags = TAP_IFFLAGS;
257 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
258 ifq_set_ready(&ifp->if_snd);
260 ether_ifattach(ifp, ether_addr, NULL);
262 tp->tap_flags |= TAP_INITED;
263 tp->tap_devq.ifq_maxlen = ifqmaxlen;
265 SLIST_INSERT_HEAD(&tap_listhead, tp, tap_link);
267 TAPDEBUG(ifp, "created. minor = %#x\n", minor(dev));
275 struct tap_softc *tp;
277 SLIST_FOREACH(tp, &tap_listhead, tap_link) {
278 if (tp->tap_unit == unit)
287 * Create a new tap instance via ifconfig.
290 tap_clone_create(struct if_clone *ifc __unused, int unit,
291 caddr_t param __unused)
293 struct tap_softc *tp;
298 if (!devfs_clone_bitmap_chk(&DEVFS_CLONE_BITMAP(tap), unit)) {
299 devfs_clone_bitmap_set(&DEVFS_CLONE_BITMAP(tap), unit);
300 dev = make_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL,
301 0600, "%s%d", TAP, unit);
303 dev = devfs_find_device_by_name("%s%d", TAP, unit);
306 KKASSERT(dev != NULL);
307 tp = tapcreate(unit, dev, TAP_MANUALMAKE);
309 tp->tap_flags |= TAP_CLONE;
310 TAPDEBUG(&tp->tap_if, "clone created. minor = %#x tap_flags = 0x%x\n",
311 minor(tp->tap_dev), tp->tap_flags);
319 * to open tunnel. must be superuser
322 tapopen(struct dev_open_args *ap)
325 struct tap_softc *tp = NULL;
326 struct ifnet *ifp = NULL;
330 (error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) != 0)
334 dev = ap->a_head.a_dev;
337 tp = tapcreate(minor(dev), dev, TAP_MANUALMAKE);
338 if (tp->tap_flags & TAP_OPEN) {
342 ifp = &tp->arpcom.ac_if;
344 if ((tp->tap_flags & TAP_CLONE) == 0) {
345 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
347 /* Announce the return of the interface. */
348 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
351 bcopy(tp->arpcom.ac_enaddr, tp->ether_addr, sizeof(tp->ether_addr));
353 if (curthread->td_proc)
354 fsetown(curthread->td_proc->p_pid, &tp->tap_sigtd);
355 tp->tap_flags |= TAP_OPEN;
358 if (tapuponopen && (ifp->if_flags & IFF_UP) == 0) {
363 ifnet_serialize_all(ifp);
365 ifnet_deserialize_all(ifp);
367 tp->tap_flags |= TAP_CLOSEDOWN;
370 TAPDEBUG(ifp, "opened. minor = %#x, refcnt = %d, taplastunit = %d\n",
371 minor(tp->tap_dev), taprefcnt, taplastunit);
378 tapclone(struct dev_clone_args *ap)
382 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(tap), 0);
383 ap->a_dev = make_only_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL,
384 0600, "%s%d", TAP, unit);
385 tapcreate(unit, ap->a_dev, 0);
392 * close the device - mark i/f down & delete routing info
395 tapclose(struct dev_close_args *ap)
397 cdev_t dev = ap->a_head.a_dev;
398 struct tap_softc *tp = dev->si_drv1;
399 struct ifnet *ifp = &tp->tap_if;
404 /* Junk all pending output */
405 ifq_purge_all(&ifp->if_snd);
408 * Do not bring the interface down, and do not anything with
409 * interface, if we are in VMnet mode. just close the device.
411 * If the interface is not cloned, we always bring it down.
413 * If the interface is cloned, then we bring it down during
414 * closing only if it was brought up during opening.
416 if ((tp->tap_flags & TAP_VMNET) == 0 &&
417 ((tp->tap_flags & TAP_CLONE) == 0 ||
418 (tp->tap_flags & TAP_CLOSEDOWN))) {
419 if (ifp->if_flags & IFF_UP)
423 ifnet_serialize_all(ifp);
424 tapifstop(tp, clear_flags);
425 ifnet_deserialize_all(ifp);
427 if ((tp->tap_flags & TAP_CLONE) == 0) {
428 if_purgeaddrs_nolink(ifp);
430 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
432 /* Announce the departure of the interface. */
433 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
436 funsetown(&tp->tap_sigio);
437 tp->tap_sigio = NULL;
438 KNOTE(&tp->tap_rkq.ki_note, 0);
440 tp->tap_flags &= ~TAP_OPEN;
441 funsetown(&tp->tap_sigtd);
442 tp->tap_sigtd = NULL;
447 if_printf(ifp, "minor = %#x, refcnt = %d is out of sync. "
448 "set refcnt to 0\n", minor(tp->tap_dev), taprefcnt);
451 TAPDEBUG(ifp, "closed. minor = %#x, refcnt = %d, taplastunit = %d\n",
452 minor(tp->tap_dev), taprefcnt, taplastunit);
455 * Only auto-destroy if the interface was not manually
458 if ((tp->tap_flags & TAP_MANUALMAKE) == 0 &&
459 tp->tap_unit >= TAP_PREALLOCATED_UNITS) {
470 * Destroy a tap instance.
473 tapdestroy(struct tap_softc *tp)
475 struct ifnet *ifp = &tp->arpcom.ac_if;
478 TAPDEBUG(ifp, "destroyed. minor = %#x, refcnt = %d, taplastunit = %d\n",
479 minor(tp->tap_dev), taprefcnt, taplastunit);
481 ifnet_serialize_all(ifp);
483 ifnet_deserialize_all(ifp);
486 SLIST_REMOVE(&tap_listhead, tp, tap_softc, tap_link);
492 release_dev(dev); /* tp association */
495 * Also destroy the cloned device
497 if (tp->tap_unit >= TAP_PREALLOCATED_UNITS) {
499 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(tap), tp->tap_unit);
510 * Destroy a tap instance.
513 tap_clone_destroy(struct ifnet *ifp)
515 struct tap_softc *tp = ifp->if_softc;
517 if ((tp->tap_flags & TAP_CLONE) == 0)
520 TAPDEBUG(&tp->tap_if, "clone destroyed. minor = %#x tap_flags = 0x%x\n",
521 minor(tp->tap_dev), tp->tap_flags);
530 * Network interface initialization function (called with if serializer held)
537 struct tap_softc *tp = xtp;
538 struct ifnet *ifp = &tp->tap_if;
539 struct ifaltq_subque *ifsq = ifq_get_subq_default(&ifp->if_snd);
541 TAPDEBUG(ifp, "initializing, minor = %#x tap_flags = 0x%x\n",
542 minor(tp->tap_dev), tp->tap_flags);
544 ASSERT_IFNET_SERIALIZED_ALL(ifp);
548 ifp->if_flags |= IFF_RUNNING;
549 ifsq_clr_oactive(ifsq);
551 /* attempt to start output */
552 tapifstart(ifp, ifsq);
559 * Process an ioctl request on network interface (called with if serializer
565 tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
567 struct tap_softc *tp = (struct tap_softc *)(ifp->if_softc);
568 struct ifstat *ifs = NULL;
569 struct ifmediareq *ifmr = NULL;
577 error = ether_ioctl(ifp, cmd, data);
584 case SIOCADDMULTI: /* XXX -- just like vmnet does */
590 * The bridge code needs this when running the
591 * spanning tree protocol.
593 ifmr = (struct ifmediareq *)data;
594 dummy = ifmr->ifm_count;
596 ifmr->ifm_status = IFM_AVALID;
597 ifmr->ifm_active = IFM_ETHER;
598 if (tp->tap_flags & TAP_OPEN)
599 ifmr->ifm_status |= IFM_ACTIVE;
600 ifmr->ifm_current = ifmr->ifm_active;
602 int media = IFM_ETHER;
603 error = copyout(&media,
610 ifs = (struct ifstat *)data;
611 dummy = strlen(ifs->ascii);
612 if ((tp->tap_flags & TAP_OPEN) &&
613 dummy < sizeof(ifs->ascii)) {
614 if (tp->tap_sigtd && tp->tap_sigtd->sio_proc) {
615 ksnprintf(ifs->ascii + dummy,
616 sizeof(ifs->ascii) - dummy,
617 "\tOpened by pid %d\n",
618 (int)tp->tap_sigtd->sio_proc->p_pid);
620 ksnprintf(ifs->ascii + dummy,
621 sizeof(ifs->ascii) - dummy,
622 "\tOpened by <unknown>\n");
639 * Queue packets from higher level ready to put out (called with if serializer
645 tapifstart(struct ifnet *ifp, struct ifaltq_subque *ifsq)
647 struct tap_softc *tp = ifp->if_softc;
652 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq);
653 TAPDEBUG(ifp, "starting, minor = %#x\n", minor(tp->tap_dev));
656 * do not junk pending output if we are in VMnet mode.
657 * XXX: can this do any harm because of queue overflow?
660 if (((tp->tap_flags & TAP_VMNET) == 0) &&
661 ((tp->tap_flags & TAP_READY) != TAP_READY)) {
662 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
663 minor(tp->tap_dev), tp->tap_flags);
668 ifsq_set_oactive(ifsq);
671 while ((m = ifsq_dequeue(ifsq)) != NULL) {
674 IFNET_STAT_INC(ifp, oerrors, 1);
678 IFNET_STAT_INC(ifp, opackets, 1);
684 if (tp->tap_flags & TAP_RWAIT) {
685 tp->tap_flags &= ~TAP_RWAIT;
689 KNOTE(&tp->tap_rkq.ki_note, 0);
691 if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) {
693 pgsigio(tp->tap_sigio, SIGIO, 0);
698 ifsq_clr_oactive(ifsq);
705 * The ops interface is now pretty minimal. Called via fileops with nothing
711 tapioctl(struct dev_ioctl_args *ap)
713 cdev_t dev = ap->a_head.a_dev;
714 caddr_t data = ap->a_data;
715 struct tap_softc *tp = dev->si_drv1;
716 struct ifnet *ifp = &tp->tap_if;
717 struct tapinfo *tapp = NULL;
722 ifnet_serialize_all(ifp);
727 tapp = (struct tapinfo *)data;
728 ifp->if_mtu = tapp->mtu;
729 ifp->if_type = tapp->type;
730 ifp->if_baudrate = tapp->baudrate;
734 tapp = (struct tapinfo *)data;
735 tapp->mtu = ifp->if_mtu;
736 tapp->type = ifp->if_type;
737 tapp->baudrate = ifp->if_baudrate;
741 tapdebug = *(int *)data;
745 *(int *)data = tapdebug;
750 tp->tap_flags |= TAP_ASYNC;
752 tp->tap_flags &= ~TAP_ASYNC;
756 /* Take a look at devq first */
757 IF_POLL(&tp->tap_devq, mb);
760 for(; mb != NULL; mb = mb->m_next)
761 *(int *)data += mb->m_len;
763 *(int *)data = ifsq_poll_pktlen(
764 ifq_get_subq_default(&ifp->if_snd));
769 error = fsetown(*(int *)data, &tp->tap_sigio);
773 *(int *)data = fgetown(&tp->tap_sigio);
776 /* this is deprecated, FIOSETOWN should be used instead */
778 error = fsetown(-(*(int *)data), &tp->tap_sigio);
781 /* this is deprecated, FIOGETOWN should be used instead */
783 *(int *)data = -fgetown(&tp->tap_sigio);
786 /* VMware/VMnet port ioctl's */
788 case SIOCGIFFLAGS: /* get ifnet flags */
789 bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags));
792 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */
795 f &= ~IFF_CANTCHANGE;
797 ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE);
800 case OSIOCGIFADDR: /* get MAC address of the remote side */
802 bcopy(tp->ether_addr, data, sizeof(tp->ether_addr));
805 case SIOCSIFADDR: /* set MAC address of the remote side */
806 bcopy(data, tp->ether_addr, sizeof(tp->ether_addr));
813 ifnet_deserialize_all(ifp);
821 * The ops read interface - reads a packet at a time, or at
822 * least as much of a packet as can be read.
824 * Called from the fileops interface with nothing held.
829 tapread(struct dev_read_args *ap)
831 cdev_t dev = ap->a_head.a_dev;
832 struct uio *uio = ap->a_uio;
833 struct tap_softc *tp = dev->si_drv1;
834 struct ifnet *ifp = &tp->tap_if;
835 struct mbuf *m0 = NULL;
838 TAPDEBUG(ifp, "reading, minor = %#x\n", minor(tp->tap_dev));
840 if ((tp->tap_flags & TAP_READY) != TAP_READY) {
841 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
842 minor(tp->tap_dev), tp->tap_flags);
847 tp->tap_flags &= ~TAP_RWAIT;
849 /* sleep until we get a packet */
851 ifnet_serialize_all(ifp);
852 IF_DEQUEUE(&tp->tap_devq, m0);
854 if (ap->a_ioflag & IO_NDELAY) {
855 ifnet_deserialize_all(ifp);
856 return (EWOULDBLOCK);
858 tp->tap_flags |= TAP_RWAIT;
859 tsleep_interlock(tp, PCATCH);
860 ifnet_deserialize_all(ifp);
861 error = tsleep(tp, PCATCH | PINTERLOCKED, "taprd", 0);
865 ifnet_deserialize_all(ifp);
867 } while (m0 == NULL);
871 /* xfer packet to user space */
872 while ((m0 != NULL) && (uio->uio_resid > 0) && (error == 0)) {
873 len = (int)szmin(uio->uio_resid, m0->m_len);
877 error = uiomove(mtod(m0, caddr_t), (size_t)len, uio);
882 TAPDEBUG(ifp, "dropping mbuf, minor = %#x\n",
893 * The ops write interface - an atomic write is a packet - or else!
895 * Called from the fileops interface with nothing held.
900 tapwrite(struct dev_write_args *ap)
902 cdev_t dev = ap->a_head.a_dev;
903 struct uio *uio = ap->a_uio;
904 struct tap_softc *tp = dev->si_drv1;
905 struct ifnet *ifp = &tp->tap_if;
906 struct mbuf *top = NULL, **mp = NULL, *m = NULL;
910 TAPDEBUG(ifp, "writing, minor = %#x\n", minor(tp->tap_dev));
912 if ((tp->tap_flags & TAP_READY) != TAP_READY) {
913 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
914 minor(tp->tap_dev), tp->tap_flags);
918 if (uio->uio_resid == 0)
921 if (uio->uio_resid > TAPMRU) {
922 TAPDEBUG(ifp, "invalid packet len = %zu, minor = %#x\n",
923 uio->uio_resid, minor(tp->tap_dev));
927 tlen = uio->uio_resid;
929 /* get a header mbuf */
930 MGETHDR(m, M_WAITOK, MT_DATA);
939 while (error == 0 && uio->uio_resid > 0) {
940 m->m_len = (int)szmin(mlen, uio->uio_resid);
941 error = uiomove(mtod(m, caddr_t), (size_t)m->m_len, uio);
944 if (uio->uio_resid > 0) {
945 MGET(m, M_WAITOK, MT_DATA);
954 IFNET_STAT_INC(ifp, ierrors, 1);
960 top->m_pkthdr.len = (int)tlen;
961 top->m_pkthdr.rcvif = ifp;
964 * Ethernet bridge and bpf are handled in ether_input
966 * adjust mbuf and give packet to the ether_input
968 ifnet_serialize_all(ifp);
969 ifp->if_input(ifp, top, NULL, -1);
970 IFNET_STAT_INC(ifp, ipackets, 1);/* ibytes are counted in ether_input */
971 ifnet_deserialize_all(ifp);
977 * tapkqfilter - called from the fileops interface with nothing held
981 static int filt_tapread(struct knote *kn, long hint);
982 static int filt_tapwrite(struct knote *kn, long hint);
983 static void filt_tapdetach(struct knote *kn);
984 static struct filterops tapread_filtops =
985 { FILTEROP_ISFD, NULL, filt_tapdetach, filt_tapread };
986 static struct filterops tapwrite_filtops =
987 { FILTEROP_ISFD, NULL, filt_tapdetach, filt_tapwrite };
990 tapkqfilter(struct dev_kqfilter_args *ap)
992 cdev_t dev = ap->a_head.a_dev;
993 struct knote *kn = ap->a_kn;
994 struct tap_softc *tp;
998 list = &tp->tap_rkq.ki_note;
1001 switch(kn->kn_filter) {
1003 kn->kn_fop = &tapread_filtops;
1004 kn->kn_hook = (void *)tp;
1007 kn->kn_fop = &tapwrite_filtops;
1008 kn->kn_hook = (void *)tp;
1011 ap->a_result = EOPNOTSUPP;
1015 knote_insert(list, kn);
1020 filt_tapread(struct knote *kn, long hint)
1022 struct tap_softc *tp = (void *)kn->kn_hook;
1024 if (IF_QEMPTY(&tp->tap_devq) == 0) /* XXX serializer */
1031 filt_tapwrite(struct knote *kn, long hint)
1033 /* Always ready for a write */
1038 filt_tapdetach(struct knote *kn)
1040 struct tap_softc *tp = (void *)kn->kn_hook;
1042 knote_remove(&tp->tap_rkq.ki_note, kn);
1046 tapifstop(struct tap_softc *tp, int clear_flags)
1048 struct ifnet *ifp = &tp->tap_if;
1050 ASSERT_IFNET_SERIALIZED_ALL(ifp);
1051 IF_DRAIN(&tp->tap_devq);
1052 tp->tap_flags &= ~TAP_CLOSEDOWN;
1054 ifp->if_flags &= ~IFF_RUNNING;
1055 ifsq_clr_oactive(ifq_get_subq_default(&ifp->if_snd));
1060 tapifflags(struct tap_softc *tp)
1062 struct ifnet *ifp = &tp->arpcom.ac_if;
1064 ASSERT_IFNET_SERIALIZED_ALL(ifp);
1065 if ((tp->tap_flags & TAP_VMNET) == 0) {
1067 * Only for non-vmnet tap(4)
1069 if (ifp->if_flags & IFF_UP) {
1070 if ((ifp->if_flags & IFF_RUNNING) == 0)