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.
35 * $Id: if_tap.c,v 0.21 2000/07/23 21:46:02 max Exp $
38 #include "opt_compat.h"
41 #include <sys/param.h>
43 #include <sys/fcntl.h>
44 #include <sys/filio.h>
45 #include <sys/kernel.h>
46 #include <sys/malloc.h>
48 #include <sys/module.h>
52 #include <sys/selinfo.h>
53 #include <sys/signalvar.h>
54 #include <sys/socket.h>
55 #include <sys/sockio.h>
56 #include <sys/sysctl.h>
57 #include <sys/systm.h>
58 #include <sys/ttycom.h>
60 #include <sys/queue.h>
63 #include <net/ethernet.h>
65 #include <net/if_clone.h>
66 #include <net/if_dl.h>
67 #include <net/route.h>
68 #include <net/if_types.h>
70 #include <netinet/in.h>
72 #include <net/if_tapvar.h>
73 #include <net/if_tap.h>
76 #define CDEV_NAME "tap"
77 #define TAPDEBUG if (tapdebug) printf
81 #define TAPMAXUNIT 0x7fff
82 #define VMNET_DEV_MASK CLONE_FLAG0
85 static int tapmodevent(module_t, int, void *);
88 static void tapclone(void *, struct ucred *, char *, int,
90 static void tapcreate(struct cdev *);
92 /* network interface */
93 static void tapifstart(struct ifnet *);
94 static int tapifioctl(struct ifnet *, u_long, caddr_t);
95 static void tapifinit(void *);
97 static int tap_clone_create(struct if_clone *, int, caddr_t);
98 static void tap_clone_destroy(struct ifnet *);
99 static int vmnet_clone_create(struct if_clone *, int, caddr_t);
100 static void vmnet_clone_destroy(struct ifnet *);
102 IFC_SIMPLE_DECLARE(tap, 0);
103 IFC_SIMPLE_DECLARE(vmnet, 0);
105 /* character device */
106 static d_open_t tapopen;
107 static d_close_t tapclose;
108 static d_read_t tapread;
109 static d_write_t tapwrite;
110 static d_ioctl_t tapioctl;
111 static d_poll_t tappoll;
112 static d_kqfilter_t tapkqfilter;
115 static int tapkqread(struct knote *, long);
116 static int tapkqwrite(struct knote *, long);
117 static void tapkqdetach(struct knote *);
119 static struct filterops tap_read_filterops = {
122 .f_detach = tapkqdetach,
123 .f_event = tapkqread,
126 static struct filterops tap_write_filterops = {
129 .f_detach = tapkqdetach,
130 .f_event = tapkqwrite,
133 static struct cdevsw tap_cdevsw = {
134 .d_version = D_VERSION,
135 .d_flags = D_PSEUDO | D_NEEDGIANT | D_NEEDMINOR,
143 .d_kqfilter = tapkqfilter,
147 * All global variables in if_tap.c are locked with tapmtx, with the
148 * exception of tapdebug, which is accessed unlocked; tapclones is
151 static struct mtx tapmtx;
152 static int tapdebug = 0; /* debug flag */
153 static int tapuopen = 0; /* allow user open() */
154 static int tapuponopen = 0; /* IFF_UP on open() */
155 static int tapdclone = 1; /* enable devfs cloning */
156 static SLIST_HEAD(, tap_softc) taphead; /* first device */
157 static struct clonedevs *tapclones;
159 MALLOC_DECLARE(M_TAP);
160 MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface");
161 SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, "");
163 SYSCTL_DECL(_net_link);
164 SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0,
165 "Ethernet tunnel software network interface");
166 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0,
167 "Allow user to open /dev/tap (based on node permissions)");
168 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0,
169 "Bring interface up when /dev/tap is opened");
170 SYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RW, &tapdclone, 0,
171 "Enably legacy devfs interface creation");
172 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, "");
174 TUNABLE_INT("net.link.tap.devfs_cloning", &tapdclone);
176 DEV_MODULE(if_tap, tapmodevent, NULL);
179 tap_clone_create(struct if_clone *ifc, int unit, caddr_t params)
185 if (strcmp(ifc->ifc_name, VMNET) == 0)
186 extra = VMNET_DEV_MASK;
190 /* find any existing device, or allocate new unit number */
191 i = clone_create(&tapclones, &tap_cdevsw, &unit, &dev, extra);
193 dev = make_dev(&tap_cdevsw, unit | extra,
194 UID_ROOT, GID_WHEEL, 0600, "%s%d", ifc->ifc_name, unit);
201 /* vmnet devices are tap devices in disguise */
203 vmnet_clone_create(struct if_clone *ifc, int unit, caddr_t params)
205 return tap_clone_create(ifc, unit, params);
209 tap_destroy(struct tap_softc *tp)
211 struct ifnet *ifp = tp->tap_ifp;
215 KASSERT(!(tp->tap_flags & TAP_OPEN),
216 ("%s flags is out of sync", ifp->if_xname));
218 knlist_destroy(&tp->tap_rsel.si_note);
219 destroy_dev(tp->tap_dev);
222 if_free_type(ifp, IFT_ETHER);
225 mtx_destroy(&tp->tap_mtx);
230 tap_clone_destroy(struct ifnet *ifp)
232 struct tap_softc *tp = ifp->if_softc;
235 SLIST_REMOVE(&taphead, tp, tap_softc, tap_next);
240 /* vmnet devices are tap devices in disguise */
242 vmnet_clone_destroy(struct ifnet *ifp)
244 tap_clone_destroy(ifp);
250 * module event handler
253 tapmodevent(module_t mod, int type, void *data)
255 static eventhandler_tag eh_tag = NULL;
256 struct tap_softc *tp = NULL;
257 struct ifnet *ifp = NULL;
262 /* intitialize device */
264 mtx_init(&tapmtx, "tapmtx", NULL, MTX_DEF);
265 SLIST_INIT(&taphead);
267 clone_setup(&tapclones);
268 eh_tag = EVENTHANDLER_REGISTER(dev_clone, tapclone, 0, 1000);
269 if (eh_tag == NULL) {
270 clone_cleanup(&tapclones);
271 mtx_destroy(&tapmtx);
274 if_clone_attach(&tap_cloner);
275 if_clone_attach(&vmnet_cloner);
280 * The EBUSY algorithm here can't quite atomically
281 * guarantee that this is race-free since we have to
282 * release the tap mtx to deregister the clone handler.
285 SLIST_FOREACH(tp, &taphead, tap_next) {
286 mtx_lock(&tp->tap_mtx);
287 if (tp->tap_flags & TAP_OPEN) {
288 mtx_unlock(&tp->tap_mtx);
292 mtx_unlock(&tp->tap_mtx);
296 EVENTHANDLER_DEREGISTER(dev_clone, eh_tag);
297 if_clone_detach(&tap_cloner);
298 if_clone_detach(&vmnet_cloner);
299 drain_dev_clone_events();
302 while ((tp = SLIST_FIRST(&taphead)) != NULL) {
303 SLIST_REMOVE_HEAD(&taphead, tap_next);
308 TAPDEBUG("detaching %s\n", ifp->if_xname);
314 clone_cleanup(&tapclones);
316 mtx_destroy(&tapmtx);
331 * We need to support two kind of devices - tap and vmnet
334 tapclone(void *arg, struct ucred *cred, char *name, int namelen, struct cdev **dev)
336 char devname[SPECNAMELEN + 1];
337 int i, unit, append_unit;
344 (!tapuopen && priv_check_cred(cred, PRIV_NET_IFCREATE, 0) != 0))
351 /* We're interested in only tap/vmnet devices. */
352 if (strcmp(name, TAP) == 0) {
354 } else if (strcmp(name, VMNET) == 0) {
356 extra = VMNET_DEV_MASK;
357 } else if (dev_stdclone(name, NULL, TAP, &unit) != 1) {
358 if (dev_stdclone(name, NULL, VMNET, &unit) != 1) {
361 extra = VMNET_DEV_MASK;
368 /* find any existing device, or allocate new unit number */
369 i = clone_create(&tapclones, &tap_cdevsw, &unit, dev, extra);
373 * We were passed 'tun' or 'tap', with no unit specified
374 * so we'll need to append it now.
376 namelen = snprintf(devname, sizeof(devname), "%s%d", name,
381 *dev = make_dev_credf(MAKEDEV_REF, &tap_cdevsw, unit | extra,
382 cred, UID_ROOT, GID_WHEEL, 0600, "%s", name);
385 if_clone_create(name, namelen, NULL);
392 * to create interface
395 tapcreate(struct cdev *dev)
397 struct ifnet *ifp = NULL;
398 struct tap_softc *tp = NULL;
399 unsigned short macaddr_hi;
400 uint32_t macaddr_mid;
405 dev->si_flags &= ~SI_CHEAPCLONE;
407 /* allocate driver storage and create device */
408 tp = malloc(sizeof(*tp), M_TAP, M_WAITOK | M_ZERO);
409 mtx_init(&tp->tap_mtx, "tap_mtx", NULL, MTX_DEF);
411 SLIST_INSERT_HEAD(&taphead, tp, tap_next);
414 unit = dev2unit(dev);
416 /* select device: tap or vmnet */
417 if (unit & VMNET_DEV_MASK) {
419 tp->tap_flags |= TAP_VMNET;
425 TAPDEBUG("tapcreate(%s%d). minor = %#x\n", name, unit, dev2unit(dev));
427 /* generate fake MAC address: 00 bd xx xx xx unit_no */
428 macaddr_hi = htons(0x00bd);
429 macaddr_mid = (uint32_t) ticks;
430 bcopy(&macaddr_hi, eaddr, sizeof(short));
431 bcopy(&macaddr_mid, &eaddr[2], sizeof(uint32_t));
432 eaddr[5] = (u_char)unit;
434 /* fill the rest and attach interface */
435 ifp = tp->tap_ifp = if_alloc(IFT_ETHER);
437 panic("%s%d: can not if_alloc()", name, unit);
439 if_initname(ifp, name, unit);
440 ifp->if_init = tapifinit;
441 ifp->if_start = tapifstart;
442 ifp->if_ioctl = tapifioctl;
443 ifp->if_mtu = ETHERMTU;
444 ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST);
445 ifp->if_snd.ifq_maxlen = ifqmaxlen;
446 ifp->if_capabilities |= IFCAP_LINKSTATE;
447 ifp->if_capenable |= IFCAP_LINKSTATE;
453 ether_ifattach(ifp, eaddr);
456 mtx_lock(&tp->tap_mtx);
457 tp->tap_flags |= TAP_INITED;
458 mtx_unlock(&tp->tap_mtx);
460 knlist_init_mtx(&tp->tap_rsel.si_note, NULL);
462 TAPDEBUG("interface %s is created. minor = %#x\n",
463 ifp->if_xname, dev2unit(dev));
470 * to open tunnel. must be superuser
473 tapopen(struct cdev *dev, int flag, int mode, struct thread *td)
475 struct tap_softc *tp = NULL;
476 struct ifnet *ifp = NULL;
480 error = priv_check(td, PRIV_NET_TAP);
485 if ((dev2unit(dev) & CLONE_UNITMASK) > TAPMAXUNIT)
490 mtx_lock(&tp->tap_mtx);
491 if (tp->tap_flags & TAP_OPEN) {
492 mtx_unlock(&tp->tap_mtx);
496 bcopy(IF_LLADDR(tp->tap_ifp), tp->ether_addr, sizeof(tp->ether_addr));
497 tp->tap_pid = td->td_proc->p_pid;
498 tp->tap_flags |= TAP_OPEN;
500 mtx_unlock(&tp->tap_mtx);
503 ifp->if_drv_flags |= IFF_DRV_RUNNING;
504 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
506 ifp->if_flags |= IFF_UP;
507 if_link_state_change(ifp, LINK_STATE_UP);
510 TAPDEBUG("%s is open. minor = %#x\n", ifp->if_xname, dev2unit(dev));
519 * close the device - mark i/f down & delete routing info
522 tapclose(struct cdev *dev, int foo, int bar, struct thread *td)
525 struct tap_softc *tp = dev->si_drv1;
526 struct ifnet *ifp = tp->tap_ifp;
529 /* junk all pending output */
530 IF_DRAIN(&ifp->if_snd);
533 * do not bring the interface down, and do not anything with
534 * interface, if we are in VMnet mode. just close the device.
537 mtx_lock(&tp->tap_mtx);
538 if (((tp->tap_flags & TAP_VMNET) == 0) && (ifp->if_flags & IFF_UP)) {
539 mtx_unlock(&tp->tap_mtx);
542 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
543 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
544 rtinit(ifa, (int)RTM_DELETE, 0);
547 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
551 mtx_unlock(&tp->tap_mtx);
553 if_link_state_change(ifp, LINK_STATE_DOWN);
554 funsetown(&tp->tap_sigio);
555 selwakeuppri(&tp->tap_rsel, PZERO+1);
556 KNOTE_UNLOCKED(&tp->tap_rsel.si_note, 0);
558 mtx_lock(&tp->tap_mtx);
559 tp->tap_flags &= ~TAP_OPEN;
561 mtx_unlock(&tp->tap_mtx);
563 TAPDEBUG("%s is closed. minor = %#x\n",
564 ifp->if_xname, dev2unit(dev));
573 * network interface initialization function
578 struct tap_softc *tp = (struct tap_softc *)xtp;
579 struct ifnet *ifp = tp->tap_ifp;
581 TAPDEBUG("initializing %s\n", ifp->if_xname);
583 ifp->if_drv_flags |= IFF_DRV_RUNNING;
584 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
586 /* attempt to start output */
594 * Process an ioctl request on network interface
597 tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
599 struct tap_softc *tp = ifp->if_softc;
600 struct ifreq *ifr = (struct ifreq *)data;
601 struct ifstat *ifs = NULL;
605 case SIOCSIFFLAGS: /* XXX -- just like vmnet does */
611 ifp->if_mtu = ifr->ifr_mtu;
616 ifs = (struct ifstat *)data;
617 dummy = strlen(ifs->ascii);
618 mtx_lock(&tp->tap_mtx);
619 if (tp->tap_pid != 0 && dummy < sizeof(ifs->ascii))
620 snprintf(ifs->ascii + dummy,
621 sizeof(ifs->ascii) - dummy,
622 "\tOpened by PID %d\n", tp->tap_pid);
623 mtx_unlock(&tp->tap_mtx);
629 dummy = ether_ioctl(ifp, cmd, data);
642 * queue packets from higher level ready to put out
645 tapifstart(struct ifnet *ifp)
647 struct tap_softc *tp = ifp->if_softc;
650 TAPDEBUG("%s starting\n", ifp->if_xname);
653 * do not junk pending output if we are in VMnet mode.
654 * XXX: can this do any harm because of queue overflow?
657 mtx_lock(&tp->tap_mtx);
658 if (((tp->tap_flags & TAP_VMNET) == 0) &&
659 ((tp->tap_flags & TAP_READY) != TAP_READY)) {
660 struct mbuf *m = NULL;
662 mtx_unlock(&tp->tap_mtx);
665 TAPDEBUG("%s not ready, tap_flags = 0x%x\n", ifp->if_xname,
670 IF_DEQUEUE(&ifp->if_snd, m);
679 mtx_unlock(&tp->tap_mtx);
682 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
684 if (ifp->if_snd.ifq_len != 0) {
685 mtx_lock(&tp->tap_mtx);
686 if (tp->tap_flags & TAP_RWAIT) {
687 tp->tap_flags &= ~TAP_RWAIT;
691 if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) {
692 mtx_unlock(&tp->tap_mtx);
693 pgsigio(&tp->tap_sigio, SIGIO, 0);
695 mtx_unlock(&tp->tap_mtx);
697 selwakeuppri(&tp->tap_rsel, PZERO+1);
698 KNOTE_UNLOCKED(&tp->tap_rsel.si_note, 0);
699 ifp->if_opackets ++; /* obytes are counted in ether_output */
702 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
710 * the cdevsw interface is now pretty minimal
713 tapioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
715 struct tap_softc *tp = dev->si_drv1;
716 struct ifnet *ifp = tp->tap_ifp;
717 struct tapinfo *tapp = NULL;
720 #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
721 defined(COMPAT_FREEBSD4)
728 tapp = (struct tapinfo *)data;
729 ifp->if_mtu = tapp->mtu;
730 ifp->if_type = tapp->type;
731 ifp->if_baudrate = tapp->baudrate;
736 tapp = (struct tapinfo *)data;
737 tapp->mtu = ifp->if_mtu;
738 tapp->type = ifp->if_type;
739 tapp->baudrate = ifp->if_baudrate;
743 tapdebug = *(int *)data;
747 *(int *)data = tapdebug;
751 struct ifreq *ifr = (struct ifreq *) data;
753 strlcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ);
761 mtx_lock(&tp->tap_mtx);
763 tp->tap_flags |= TAP_ASYNC;
765 tp->tap_flags &= ~TAP_ASYNC;
766 mtx_unlock(&tp->tap_mtx);
772 if (ifp->if_snd.ifq_head) {
773 struct mbuf *mb = ifp->if_snd.ifq_head;
775 for(*(int *)data = 0;mb != NULL;mb = mb->m_next)
776 *(int *)data += mb->m_len;
783 return (fsetown(*(int *)data, &tp->tap_sigio));
786 *(int *)data = fgetown(&tp->tap_sigio);
789 /* this is deprecated, FIOSETOWN should be used instead */
791 return (fsetown(-(*(int *)data), &tp->tap_sigio));
793 /* this is deprecated, FIOGETOWN should be used instead */
795 *(int *)data = -fgetown(&tp->tap_sigio);
798 /* VMware/VMnet port ioctl's */
800 case SIOCGIFFLAGS: /* get ifnet flags */
801 bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags));
804 #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
805 defined(COMPAT_FREEBSD4)
807 ival = IOCPARM_IVAL(data);
808 data = (caddr_t)&ival;
811 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */
814 f &= ~IFF_CANTCHANGE;
818 ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE);
822 case OSIOCGIFADDR: /* get MAC address of the remote side */
824 mtx_lock(&tp->tap_mtx);
825 bcopy(tp->ether_addr, data, sizeof(tp->ether_addr));
826 mtx_unlock(&tp->tap_mtx);
829 case SIOCSIFADDR: /* set MAC address of the remote side */
830 mtx_lock(&tp->tap_mtx);
831 bcopy(data, tp->ether_addr, sizeof(tp->ether_addr));
832 mtx_unlock(&tp->tap_mtx);
845 * the cdevsw read interface - reads a packet at a time, or at
846 * least as much of a packet as can be read
849 tapread(struct cdev *dev, struct uio *uio, int flag)
851 struct tap_softc *tp = dev->si_drv1;
852 struct ifnet *ifp = tp->tap_ifp;
853 struct mbuf *m = NULL;
854 int error = 0, len, s;
856 TAPDEBUG("%s reading, minor = %#x\n", ifp->if_xname, dev2unit(dev));
858 mtx_lock(&tp->tap_mtx);
859 if ((tp->tap_flags & TAP_READY) != TAP_READY) {
860 mtx_unlock(&tp->tap_mtx);
863 TAPDEBUG("%s not ready. minor = %#x, tap_flags = 0x%x\n",
864 ifp->if_xname, dev2unit(dev), tp->tap_flags);
869 tp->tap_flags &= ~TAP_RWAIT;
870 mtx_unlock(&tp->tap_mtx);
872 /* sleep until we get a packet */
875 IF_DEQUEUE(&ifp->if_snd, m);
879 if (flag & O_NONBLOCK)
880 return (EWOULDBLOCK);
882 mtx_lock(&tp->tap_mtx);
883 tp->tap_flags |= TAP_RWAIT;
884 mtx_unlock(&tp->tap_mtx);
885 error = tsleep(tp,PCATCH|(PZERO+1),"taprd",0);
891 /* feed packet to bpf */
894 /* xfer packet to user space */
895 while ((m != NULL) && (uio->uio_resid > 0) && (error == 0)) {
896 len = min(uio->uio_resid, m->m_len);
900 error = uiomove(mtod(m, void *), len, uio);
905 TAPDEBUG("%s dropping mbuf, minor = %#x\n", ifp->if_xname,
917 * the cdevsw write interface - an atomic write is a packet - or else!
920 tapwrite(struct cdev *dev, struct uio *uio, int flag)
922 struct ether_header *eh;
923 struct tap_softc *tp = dev->si_drv1;
924 struct ifnet *ifp = tp->tap_ifp;
927 TAPDEBUG("%s writting, minor = %#x\n",
928 ifp->if_xname, dev2unit(dev));
930 if (uio->uio_resid == 0)
933 if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) {
934 TAPDEBUG("%s invalid packet len = %zd, minor = %#x\n",
935 ifp->if_xname, uio->uio_resid, dev2unit(dev));
940 if ((m = m_uiotombuf(uio, M_DONTWAIT, 0, ETHER_ALIGN,
941 M_PKTHDR)) == NULL) {
946 m->m_pkthdr.rcvif = ifp;
949 * Only pass a unicast frame to ether_input(), if it would actually
950 * have been received by non-virtual hardware.
952 if (m->m_len < sizeof(struct ether_header)) {
956 eh = mtod(m, struct ether_header *);
958 if (eh && (ifp->if_flags & IFF_PROMISC) == 0 &&
959 !ETHER_IS_MULTICAST(eh->ether_dhost) &&
960 bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) {
965 /* Pass packet up to parent. */
966 (*ifp->if_input)(ifp, m);
967 ifp->if_ipackets ++; /* ibytes are counted in parent */
976 * the poll interface, this is only useful on reads
977 * really. the write detect always returns true, write never blocks
978 * anyway, it either accepts the packet or drops it
981 tappoll(struct cdev *dev, int events, struct thread *td)
983 struct tap_softc *tp = dev->si_drv1;
984 struct ifnet *ifp = tp->tap_ifp;
987 TAPDEBUG("%s polling, minor = %#x\n",
988 ifp->if_xname, dev2unit(dev));
991 if (events & (POLLIN | POLLRDNORM)) {
992 if (ifp->if_snd.ifq_len > 0) {
993 TAPDEBUG("%s have data in queue. len = %d, " \
994 "minor = %#x\n", ifp->if_xname,
995 ifp->if_snd.ifq_len, dev2unit(dev));
997 revents |= (events & (POLLIN | POLLRDNORM));
999 TAPDEBUG("%s waiting for data, minor = %#x\n",
1000 ifp->if_xname, dev2unit(dev));
1002 selrecord(td, &tp->tap_rsel);
1006 if (events & (POLLOUT | POLLWRNORM))
1007 revents |= (events & (POLLOUT | POLLWRNORM));
1017 * support for kevent() system call
1020 tapkqfilter(struct cdev *dev, struct knote *kn)
1023 struct tap_softc *tp = dev->si_drv1;
1024 struct ifnet *ifp = tp->tap_ifp;
1027 switch (kn->kn_filter) {
1029 TAPDEBUG("%s kqfilter: EVFILT_READ, minor = %#x\n",
1030 ifp->if_xname, dev2unit(dev));
1031 kn->kn_fop = &tap_read_filterops;
1035 TAPDEBUG("%s kqfilter: EVFILT_WRITE, minor = %#x\n",
1036 ifp->if_xname, dev2unit(dev));
1037 kn->kn_fop = &tap_write_filterops;
1041 TAPDEBUG("%s kqfilter: invalid filter, minor = %#x\n",
1042 ifp->if_xname, dev2unit(dev));
1049 kn->kn_hook = (caddr_t) dev;
1050 knlist_add(&tp->tap_rsel.si_note, kn, 0);
1059 * Return true if there is data in the interface queue
1062 tapkqread(struct knote *kn, long hint)
1065 struct cdev *dev = (struct cdev *)(kn->kn_hook);
1066 struct tap_softc *tp = dev->si_drv1;
1067 struct ifnet *ifp = tp->tap_ifp;
1070 if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) {
1071 TAPDEBUG("%s have data in queue. len = %d, minor = %#x\n",
1072 ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev));
1075 TAPDEBUG("%s waiting for data, minor = %#x\n",
1076 ifp->if_xname, dev2unit(dev));
1088 * Always can write. Return the MTU in kn->data
1091 tapkqwrite(struct knote *kn, long hint)
1094 struct tap_softc *tp = ((struct cdev *) kn->kn_hook)->si_drv1;
1095 struct ifnet *ifp = tp->tap_ifp;
1098 kn->kn_data = ifp->if_mtu;
1106 tapkqdetach(struct knote *kn)
1108 struct tap_softc *tp = ((struct cdev *) kn->kn_hook)->si_drv1;
1110 knlist_remove(&tp->tap_rsel.si_note, kn, 0);