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/ttycom.h>
59 #include <sys/vnode.h>
60 #include <sys/serialize.h>
62 #include <sys/thread2.h>
63 #include <sys/mplock2.h>
66 #include <net/ethernet.h>
68 #include <net/ifq_var.h>
69 #include <net/if_arp.h>
70 #include <net/if_clone.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)
81 #define TAP_PREALLOCATED_UNITS 4
83 #define CDEV_NAME "tap"
84 #define CDEV_MAJOR 149
85 #define TAPDEBUG if (tapdebug) if_printf
89 #define VMNET_DEV_MASK 0x00010000
91 DEVFS_DECLARE_CLONE_BITMAP(tap);
94 static int tapmodevent (module_t, int, void *);
97 static struct tap_softc *tapcreate(int, cdev_t);
98 static void tapdestroy(struct tap_softc *);
101 static int tap_clone_create(struct if_clone *, int, caddr_t);
102 static void tap_clone_destroy(struct ifnet *);
105 /* network interface */
106 static void tapifstart (struct ifnet *);
107 static int tapifioctl (struct ifnet *, u_long, caddr_t,
109 static void tapifinit (void *);
110 static void tapifstop(struct tap_softc *, int);
111 static void tapifflags(struct tap_softc *);
113 /* character device */
114 static d_open_t tapopen;
115 static d_clone_t tapclone;
116 static d_close_t tapclose;
117 static d_read_t tapread;
118 static d_write_t tapwrite;
119 static d_ioctl_t tapioctl;
120 static d_poll_t tappoll;
121 static d_kqfilter_t tapkqfilter;
123 static struct dev_ops tap_ops = {
124 { CDEV_NAME, CDEV_MAJOR, 0 },
131 .d_kqfilter = tapkqfilter
134 static int taprefcnt = 0; /* module ref. counter */
135 static int taplastunit = -1; /* max. open unit number */
136 static int tapdebug = 0; /* debug flag */
137 static int tapuopen = 0; /* all user open() */
138 static int tapuponopen = 0; /* IFF_UP */
140 MALLOC_DECLARE(M_TAP);
141 MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface");
142 struct if_clone tap_cloner = IF_CLONE_INITIALIZER("tap",
143 tap_clone_create, tap_clone_destroy,
145 static SLIST_HEAD(,tap_softc) tap_listhead =
146 SLIST_HEAD_INITIALIZER(&tap_listhead);
148 SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, "");
149 SYSCTL_DECL(_net_link);
150 SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0,
151 "Ethernet tunnel software network interface");
152 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0,
153 "Allow user to open /dev/tap (based on node permissions)");
154 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0,
155 "Bring interface up when /dev/tap is opened");
156 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, "");
158 DEV_MODULE(if_tap, tapmodevent, NULL);
163 * module event handler
166 tapmodevent(module_t mod, int type, void *data)
168 static int attached = 0;
169 struct tap_softc *tp, *ntp;
177 make_autoclone_dev(&tap_ops, &DEVFS_CLONE_BITMAP(tap), tapclone,
178 UID_ROOT, GID_WHEEL, 0600, "tap");
179 SLIST_INIT(&tap_listhead);
180 if_clone_attach(&tap_cloner);
182 for (i = 0; i < TAP_PREALLOCATED_UNITS; ++i) {
183 make_dev(&tap_ops, i, UID_ROOT, GID_WHEEL,
185 devfs_clone_bitmap_set(&DEVFS_CLONE_BITMAP(tap), i);
195 if_clone_detach(&tap_cloner);
197 /* Maintain tap ifs in a local list */
198 SLIST_FOREACH_MUTABLE(tp, &tap_listhead, tap_link, ntp)
203 devfs_clone_handler_del("tap");
204 dev_ops_remove_all(&tap_ops);
205 devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(tap));
217 * tapcreate - create or clone an interface
219 static struct tap_softc *
220 tapcreate(int unit, cdev_t dev)
222 const char *name = TAP;
224 struct tap_softc *tp;
225 uint8_t ether_addr[ETHER_ADDR_LEN];
227 tp = kmalloc(sizeof(*tp), M_TAP, M_WAITOK | M_ZERO);
232 reference_dev(dev); /* tp association */
234 /* generate fake MAC address: 00 bd xx xx xx unit_no */
235 ether_addr[0] = 0x00;
236 ether_addr[1] = 0xbd;
237 bcopy(&ticks, ðer_addr[2], 3);
238 ether_addr[5] = (u_char)unit;
240 /* fill the rest and attach interface */
244 if_initname(ifp, name, unit);
245 if (unit > taplastunit)
248 ifp->if_init = tapifinit;
249 ifp->if_start = tapifstart;
250 ifp->if_ioctl = tapifioctl;
251 ifp->if_mtu = ETHERMTU;
252 ifp->if_flags = TAP_IFFLAGS;
253 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
254 ifq_set_ready(&ifp->if_snd);
256 ether_ifattach(ifp, ether_addr, NULL);
258 tp->tap_flags |= TAP_INITED;
259 tp->tap_devq.ifq_maxlen = ifqmaxlen;
261 SLIST_INSERT_HEAD(&tap_listhead, tp, tap_link);
263 TAPDEBUG(ifp, "created. minor = %#x\n", minor(dev));
271 struct tap_softc *tp;
273 SLIST_FOREACH(tp, &tap_listhead, tap_link) {
274 if (tp->tap_unit == unit)
283 * Create a new tap instance via ifconfig.
286 tap_clone_create(struct if_clone *ifc __unused, int unit,
287 caddr_t param __unused)
289 struct tap_softc *tp;
294 if (!devfs_clone_bitmap_chk(&DEVFS_CLONE_BITMAP(tap), unit)) {
295 devfs_clone_bitmap_set(&DEVFS_CLONE_BITMAP(tap), unit);
296 dev = make_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL,
297 0600, "%s%d", TAP, unit);
299 dev = devfs_find_device_by_name("%s%d", TAP, unit);
302 KKASSERT(dev != NULL);
303 tp = tapcreate(unit, dev);
305 tp->tap_flags |= TAP_CLONE;
306 TAPDEBUG(&tp->tap_if, "clone created. minor = %#x tap_flags = 0x%x\n",
307 minor(tp->tap_dev), tp->tap_flags);
315 * to open tunnel. must be superuser
318 tapopen(struct dev_open_args *ap)
321 struct tap_softc *tp = NULL;
322 struct ifnet *ifp = NULL;
326 (error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) != 0)
330 dev = ap->a_head.a_dev;
333 tp = tapcreate(minor(dev), dev);
334 if (tp->tap_flags & TAP_OPEN) {
338 ifp = &tp->arpcom.ac_if;
340 if ((tp->tap_flags & TAP_CLONE) == 0) {
341 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
343 /* Announce the return of the interface. */
344 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
347 bcopy(tp->arpcom.ac_enaddr, tp->ether_addr, sizeof(tp->ether_addr));
349 if (curthread->td_proc)
350 fsetown(curthread->td_proc->p_pid, &tp->tap_sigtd);
351 tp->tap_flags |= TAP_OPEN;
354 if (tapuponopen && (ifp->if_flags & IFF_UP) == 0) {
359 ifnet_serialize_all(ifp);
361 ifnet_deserialize_all(ifp);
363 tp->tap_flags |= TAP_CLOSEDOWN;
366 TAPDEBUG(ifp, "opened. minor = %#x, refcnt = %d, taplastunit = %d\n",
367 minor(tp->tap_dev), taprefcnt, taplastunit);
374 tapclone(struct dev_clone_args *ap)
378 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(tap), 0);
379 ap->a_dev = make_only_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL,
380 0600, "%s%d", TAP, unit);
381 tapcreate(unit, ap->a_dev);
388 * close the device - mark i/f down & delete routing info
391 tapclose(struct dev_close_args *ap)
393 cdev_t dev = ap->a_head.a_dev;
394 struct tap_softc *tp = dev->si_drv1;
395 struct ifnet *ifp = &tp->tap_if;
400 /* Junk all pending output */
401 ifq_purge(&ifp->if_snd);
404 * Do not bring the interface down, and do not anything with
405 * interface, if we are in VMnet mode. just close the device.
407 * If the interface is not cloned, we always bring it down.
409 * If the interface is cloned, then we bring it down during
410 * closing only if it was brought up during opening.
412 if ((tp->tap_flags & TAP_VMNET) == 0 &&
413 ((tp->tap_flags & TAP_CLONE) == 0 ||
414 (tp->tap_flags & TAP_CLOSEDOWN))) {
415 if (ifp->if_flags & IFF_UP)
419 ifnet_serialize_all(ifp);
420 tapifstop(tp, clear_flags);
421 ifnet_deserialize_all(ifp);
423 if ((tp->tap_flags & TAP_CLONE) == 0) {
424 if_purgeaddrs_nolink(ifp);
426 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
428 /* Announce the departure of the interface. */
429 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
432 funsetown(tp->tap_sigio);
433 tp->tap_sigio = NULL;
434 selwakeup(&tp->tap_rsel);
436 tp->tap_flags &= ~TAP_OPEN;
437 funsetown(tp->tap_sigtd);
438 tp->tap_sigtd = NULL;
443 if_printf(ifp, "minor = %#x, refcnt = %d is out of sync. "
444 "set refcnt to 0\n", minor(tp->tap_dev), taprefcnt);
447 TAPDEBUG(ifp, "closed. minor = %#x, refcnt = %d, taplastunit = %d\n",
448 minor(tp->tap_dev), taprefcnt, taplastunit);
450 if (tp->tap_unit >= TAP_PREALLOCATED_UNITS)
460 * Destroy a tap instance.
463 tapdestroy(struct tap_softc *tp)
465 struct ifnet *ifp = &tp->arpcom.ac_if;
468 TAPDEBUG(ifp, "destroyed. minor = %#x, refcnt = %d, taplastunit = %d\n",
469 minor(tp->tap_dev), taprefcnt, taplastunit);
471 ifnet_serialize_all(ifp);
473 ifnet_deserialize_all(ifp);
476 SLIST_REMOVE(&tap_listhead, tp, tap_softc, tap_link);
482 release_dev(dev); /* tp association */
485 * Also destroy the cloned device
487 if (tp->tap_unit >= TAP_PREALLOCATED_UNITS) {
489 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(tap), tp->tap_unit);
500 * Destroy a tap instance.
503 tap_clone_destroy(struct ifnet *ifp)
505 struct tap_softc *tp = ifp->if_softc;
507 TAPDEBUG(&tp->tap_if, "clone destroyed. minor = %#x tap_flags = 0x%x\n",
508 minor(tp->tap_dev), tp->tap_flags);
509 if (tp->tap_flags & TAP_CLONE)
516 * Network interface initialization function (called with if serializer held)
523 struct tap_softc *tp = xtp;
524 struct ifnet *ifp = &tp->tap_if;
526 TAPDEBUG(ifp, "initializing, minor = %#x tap_flags = 0x%x\n",
527 minor(tp->tap_dev), tp->tap_flags);
529 ASSERT_IFNET_SERIALIZED_ALL(ifp);
533 ifp->if_flags |= IFF_RUNNING;
534 ifp->if_flags &= ~IFF_OACTIVE;
536 /* attempt to start output */
544 * Process an ioctl request on network interface (called with if serializer
550 tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
552 struct tap_softc *tp = (struct tap_softc *)(ifp->if_softc);
553 struct ifstat *ifs = NULL;
560 dummy = ether_ioctl(ifp, cmd, data);
567 case SIOCADDMULTI: /* XXX -- just like vmnet does */
572 ifs = (struct ifstat *)data;
573 dummy = strlen(ifs->ascii);
574 if ((tp->tap_flags & TAP_OPEN) &&
575 dummy < sizeof(ifs->ascii)) {
576 if (tp->tap_sigtd && tp->tap_sigtd->sio_proc) {
577 ksnprintf(ifs->ascii + dummy,
578 sizeof(ifs->ascii) - dummy,
579 "\tOpened by pid %d\n",
580 (int)tp->tap_sigtd->sio_proc->p_pid);
582 ksnprintf(ifs->ascii + dummy,
583 sizeof(ifs->ascii) - dummy,
584 "\tOpened by <unknown>\n");
600 * Queue packets from higher level ready to put out (called with if serializer
606 tapifstart(struct ifnet *ifp)
608 struct tap_softc *tp = ifp->if_softc;
613 TAPDEBUG(ifp, "starting, minor = %#x\n", minor(tp->tap_dev));
616 * do not junk pending output if we are in VMnet mode.
617 * XXX: can this do any harm because of queue overflow?
620 if (((tp->tap_flags & TAP_VMNET) == 0) &&
621 ((tp->tap_flags & TAP_READY) != TAP_READY)) {
622 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
623 minor(tp->tap_dev), tp->tap_flags);
624 ifq_purge(&ifp->if_snd);
628 ifp->if_flags |= IFF_OACTIVE;
631 while ((m = ifq_dequeue(&ifp->if_snd, NULL)) != NULL) {
644 if (tp->tap_flags & TAP_RWAIT) {
645 tp->tap_flags &= ~TAP_RWAIT;
650 KNOTE(&tp->tap_rsel.si_note, 0);
653 if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) {
655 pgsigio(tp->tap_sigio, SIGIO, 0);
660 * selwakeup is not MPSAFE. tapifstart is.
663 selwakeup(&tp->tap_rsel);
667 ifp->if_flags &= ~IFF_OACTIVE;
674 * The ops interface is now pretty minimal. Called via fileops with nothing
680 tapioctl(struct dev_ioctl_args *ap)
682 cdev_t dev = ap->a_head.a_dev;
683 caddr_t data = ap->a_data;
684 struct tap_softc *tp = dev->si_drv1;
685 struct ifnet *ifp = &tp->tap_if;
686 struct tapinfo *tapp = NULL;
691 ifnet_serialize_all(ifp);
696 tapp = (struct tapinfo *)data;
697 ifp->if_mtu = tapp->mtu;
698 ifp->if_type = tapp->type;
699 ifp->if_baudrate = tapp->baudrate;
703 tapp = (struct tapinfo *)data;
704 tapp->mtu = ifp->if_mtu;
705 tapp->type = ifp->if_type;
706 tapp->baudrate = ifp->if_baudrate;
710 tapdebug = *(int *)data;
714 *(int *)data = tapdebug;
719 tp->tap_flags |= TAP_ASYNC;
721 tp->tap_flags &= ~TAP_ASYNC;
727 /* Take a look at devq first */
728 IF_POLL(&tp->tap_devq, mb);
730 mb = ifq_poll(&ifp->if_snd);
733 for(; mb != NULL; mb = mb->m_next)
734 *(int *)data += mb->m_len;
739 error = fsetown(*(int *)data, &tp->tap_sigio);
743 *(int *)data = fgetown(tp->tap_sigio);
746 /* this is deprecated, FIOSETOWN should be used instead */
748 error = fsetown(-(*(int *)data), &tp->tap_sigio);
751 /* this is deprecated, FIOGETOWN should be used instead */
753 *(int *)data = -fgetown(tp->tap_sigio);
756 /* VMware/VMnet port ioctl's */
758 case SIOCGIFFLAGS: /* get ifnet flags */
759 bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags));
762 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */
765 f &= ~IFF_CANTCHANGE;
767 ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE);
770 case OSIOCGIFADDR: /* get MAC address of the remote side */
772 bcopy(tp->ether_addr, data, sizeof(tp->ether_addr));
775 case SIOCSIFADDR: /* set MAC address of the remote side */
776 bcopy(data, tp->ether_addr, sizeof(tp->ether_addr));
783 ifnet_deserialize_all(ifp);
791 * The ops read interface - reads a packet at a time, or at
792 * least as much of a packet as can be read.
794 * Called from the fileops interface with nothing held.
799 tapread(struct dev_read_args *ap)
801 cdev_t dev = ap->a_head.a_dev;
802 struct uio *uio = ap->a_uio;
803 struct tap_softc *tp = dev->si_drv1;
804 struct ifnet *ifp = &tp->tap_if;
805 struct mbuf *m0 = NULL;
808 TAPDEBUG(ifp, "reading, minor = %#x\n", minor(tp->tap_dev));
810 if ((tp->tap_flags & TAP_READY) != TAP_READY) {
811 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
812 minor(tp->tap_dev), tp->tap_flags);
817 tp->tap_flags &= ~TAP_RWAIT;
819 /* sleep until we get a packet */
821 ifnet_serialize_all(ifp);
822 IF_DEQUEUE(&tp->tap_devq, m0);
824 if (ap->a_ioflag & IO_NDELAY) {
825 ifnet_deserialize_all(ifp);
826 return (EWOULDBLOCK);
828 tp->tap_flags |= TAP_RWAIT;
829 tsleep_interlock(tp, PCATCH);
830 ifnet_deserialize_all(ifp);
831 error = tsleep(tp, PCATCH | PINTERLOCKED, "taprd", 0);
835 ifnet_deserialize_all(ifp);
837 } while (m0 == NULL);
841 /* xfer packet to user space */
842 while ((m0 != NULL) && (uio->uio_resid > 0) && (error == 0)) {
843 len = (int)szmin(uio->uio_resid, m0->m_len);
847 error = uiomove(mtod(m0, caddr_t), (size_t)len, uio);
852 TAPDEBUG(ifp, "dropping mbuf, minor = %#x\n",
863 * The ops write interface - an atomic write is a packet - or else!
865 * Called from the fileops interface with nothing held.
870 tapwrite(struct dev_write_args *ap)
872 cdev_t dev = ap->a_head.a_dev;
873 struct uio *uio = ap->a_uio;
874 struct tap_softc *tp = dev->si_drv1;
875 struct ifnet *ifp = &tp->tap_if;
876 struct mbuf *top = NULL, **mp = NULL, *m = NULL;
880 TAPDEBUG(ifp, "writing, minor = %#x\n", minor(tp->tap_dev));
882 if ((tp->tap_flags & TAP_READY) != TAP_READY) {
883 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
884 minor(tp->tap_dev), tp->tap_flags);
888 if (uio->uio_resid == 0)
891 if (uio->uio_resid > TAPMRU) {
892 TAPDEBUG(ifp, "invalid packet len = %zu, minor = %#x\n",
893 uio->uio_resid, minor(tp->tap_dev));
897 tlen = uio->uio_resid;
899 /* get a header mbuf */
900 MGETHDR(m, MB_DONTWAIT, MT_DATA);
907 while ((error == 0) && (uio->uio_resid > 0)) {
908 m->m_len = (int)szmin(mlen, uio->uio_resid);
909 error = uiomove(mtod(m, caddr_t), (size_t)m->m_len, uio);
912 if (uio->uio_resid > 0) {
913 MGET(m, MB_DONTWAIT, MT_DATA);
928 top->m_pkthdr.len = (int)tlen;
929 top->m_pkthdr.rcvif = ifp;
932 * Ethernet bridge and bpf are handled in ether_input
934 * adjust mbuf and give packet to the ether_input
936 ifnet_serialize_all(ifp);
937 ifp->if_input(ifp, top);
938 ifp->if_ipackets ++; /* ibytes are counted in ether_input */
939 ifnet_deserialize_all(ifp);
947 * The poll interface, this is only useful on reads really. The write
948 * detect always returns true, write never blocks anyway, it either
949 * accepts the packet or drops it
951 * Called from the fileops interface with nothing held.
956 tappoll(struct dev_poll_args *ap)
958 cdev_t dev = ap->a_head.a_dev;
959 struct tap_softc *tp = dev->si_drv1;
960 struct ifnet *ifp = &tp->tap_if;
963 TAPDEBUG(ifp, "polling, minor = %#x\n", minor(tp->tap_dev));
965 if (ap->a_events & (POLLIN | POLLRDNORM)) {
966 if (!IF_QEMPTY(&tp->tap_devq)) {
968 "has data in queue. minor = %#x\n",
971 revents |= (ap->a_events & (POLLIN | POLLRDNORM));
973 TAPDEBUG(ifp, "waiting for data, minor = %#x\n",
977 selrecord(curthread, &tp->tap_rsel);
982 if (ap->a_events & (POLLOUT | POLLWRNORM))
983 revents |= (ap->a_events & (POLLOUT | POLLWRNORM));
984 ap->a_events = revents;
989 * tapkqfilter - called from the fileops interface with nothing held
993 static int filt_tapread(struct knote *kn, long hint);
994 static void filt_tapdetach(struct knote *kn);
995 static struct filterops tapread_filtops =
996 { 1, NULL, filt_tapdetach, filt_tapread };
999 tapkqfilter(struct dev_kqfilter_args *ap)
1001 cdev_t dev = ap->a_head.a_dev;
1002 struct knote *kn = ap->a_kn;
1003 struct tap_softc *tp;
1012 switch(kn->kn_filter) {
1014 list = &tp->tap_rsel.si_note;
1015 kn->kn_fop = &tapread_filtops;
1016 kn->kn_hook = (void *)tp;
1021 ap->a_result = EOPNOTSUPP;
1026 SLIST_INSERT_HEAD(list, kn, kn_selnext);
1033 filt_tapread(struct knote *kn, long hint)
1035 struct tap_softc *tp = (void *)kn->kn_hook;
1037 if (IF_QEMPTY(&tp->tap_devq) == 0) /* XXX serializer */
1044 filt_tapdetach(struct knote *kn)
1046 struct tap_softc *tp = (void *)kn->kn_hook;
1048 SLIST_REMOVE(&tp->tap_rsel.si_note, kn, knote, kn_selnext);
1052 tapifstop(struct tap_softc *tp, int clear_flags)
1054 struct ifnet *ifp = &tp->tap_if;
1056 ASSERT_IFNET_SERIALIZED_ALL(ifp);
1057 IF_DRAIN(&tp->tap_devq);
1058 tp->tap_flags &= ~TAP_CLOSEDOWN;
1060 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
1064 tapifflags(struct tap_softc *tp)
1066 struct ifnet *ifp = &tp->arpcom.ac_if;
1068 ASSERT_IFNET_SERIALIZED_ALL(ifp);
1069 if ((tp->tap_flags & TAP_VMNET) == 0) {
1071 * Only for non-vmnet tap(4)
1073 if (ifp->if_flags & IFF_UP) {
1074 if ((ifp->if_flags & IFF_RUNNING) == 0)