/* * Copyright (C) 1999-2000 by Maksim Yevmenkin * 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 * Nottingham University 1987. */ /* * $FreeBSD: src/sys/net/if_tap.c,v 1.3.2.3 2002/04/14 21:41:48 luigi Exp $ * $Id: if_tap.c,v 0.21 2000/07/23 21:46:02 max Exp $ */ #include "opt_inet.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "if_tapvar.h" #include "if_tap.h" #define TAP_IFFLAGS (IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST) #define TAP "tap" #define TAPDEBUG if (tapdebug) if_printf /* module */ static int tapmodevent(module_t, int, void *); /* device */ static struct tap_softc *tapcreate(cdev_t, int); static void tapdestroy(struct tap_softc *); /* clone */ static int tap_clone_create(struct if_clone *, int, caddr_t, caddr_t); static int tap_clone_destroy(struct ifnet *); /* network interface */ static void tapifinit(void *); static void tapifstart(struct ifnet *, struct ifaltq_subque *); static int tapifioctl(struct ifnet *, u_long, caddr_t, struct ucred *); static void tapifstop(struct tap_softc *, int); static void tapifflags(struct tap_softc *); /* character device */ static d_open_t tapopen; static d_clone_t tapclone; static d_close_t tapclose; static d_read_t tapread; static d_write_t tapwrite; static d_ioctl_t tapioctl; static d_kqfilter_t tapkqfilter; static struct dev_ops tap_ops = { { TAP, 0, 0 }, .d_open = tapopen, .d_close = tapclose, .d_read = tapread, .d_write = tapwrite, .d_ioctl = tapioctl, .d_kqfilter = tapkqfilter }; /* kqueue support */ static void tap_filter_detach(struct knote *); static int tap_filter_read(struct knote *, long); static int tap_filter_write(struct knote *, long); static struct filterops tapread_filtops = { FILTEROP_ISFD, NULL, tap_filter_detach, tap_filter_read }; static struct filterops tapwrite_filtops = { FILTEROP_ISFD, NULL, tap_filter_detach, tap_filter_write }; static int tapdebug = 0; /* debug flag */ static int taprefcnt = 0; /* module ref. counter */ static int tapuopen = 0; /* allow user open() */ static int tapuponopen = 0; /* IFF_UP when opened */ static MALLOC_DEFINE(M_TAP, TAP, "Ethernet tunnel interface"); static DEVFS_DEFINE_CLONE_BITMAP(tap); struct if_clone tap_cloner = IF_CLONE_INITIALIZER( TAP, tap_clone_create, tap_clone_destroy, 0, IF_MAXUNIT); static SLIST_HEAD(,tap_softc) tap_listhead = SLIST_HEAD_INITIALIZER(&tap_listhead); 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, debug, CTLFLAG_RW, &tapdebug, 0, ""); SYSCTL_INT(_net_link_tap, OID_AUTO, refcnt, CTLFLAG_RD, &taprefcnt, 0, "Number of opened devices"); DEV_MODULE(if_tap, tapmodevent, NULL); /* * tapmodevent * * module event handler */ static int tapmodevent(module_t mod, int type, void *data) { static cdev_t dev = NULL; struct tap_softc *sc, *sc_tmp; switch (type) { case MOD_LOAD: dev = make_autoclone_dev(&tap_ops, &DEVFS_CLONE_BITMAP(tap), tapclone, UID_ROOT, GID_WHEEL, 0600, TAP); SLIST_INIT(&tap_listhead); if_clone_attach(&tap_cloner); break; case MOD_UNLOAD: if (taprefcnt > 0) return (EBUSY); if_clone_detach(&tap_cloner); SLIST_FOREACH_MUTABLE(sc, &tap_listhead, tap_link, sc_tmp) tapdestroy(sc); dev_ops_remove_all(&tap_ops); destroy_autoclone_dev(dev, &DEVFS_CLONE_BITMAP(tap)); break; default: return (EOPNOTSUPP); } return (0); } /* * Create or clone an interface */ static struct tap_softc * tapcreate(cdev_t dev, int flags) { struct tap_softc *sc; struct ifnet *ifp; uint8_t ether_addr[ETHER_ADDR_LEN]; int unit = minor(dev); sc = kmalloc(sizeof(*sc), M_TAP, M_WAITOK | M_ZERO); dev->si_drv1 = sc; sc->tap_dev = dev; sc->tap_flags |= flags; reference_dev(dev); /* device association */ /* generate fake MAC address: 00 bd xx xx xx unit_no */ ether_addr[0] = 0x00; ether_addr[1] = 0xbd; bcopy(&ticks, ðer_addr[2], 3); ether_addr[5] = (u_char)unit; /* fill the rest and attach interface */ ifp = &sc->tap_if; if_initname(ifp, TAP, unit); ifp->if_type = IFT_ETHER; ifp->if_init = tapifinit; ifp->if_start = tapifstart; ifp->if_ioctl = tapifioctl; ifp->if_mtu = ETHERMTU; ifp->if_flags = TAP_IFFLAGS; ifp->if_softc = sc; ifq_set_maxlen(&ifp->if_snd, ifqmaxlen); ifq_set_ready(&ifp->if_snd); ether_ifattach(ifp, ether_addr, NULL); sc->tap_flags |= TAP_INITED; sc->tap_devq.ifq_maxlen = ifqmaxlen; SLIST_INSERT_HEAD(&tap_listhead, sc, tap_link); TAPDEBUG(ifp, "created, minor = %#x, flags = 0x%x\n", unit, sc->tap_flags); return (sc); } static struct tap_softc * tapfind(int unit) { struct tap_softc *sc; SLIST_FOREACH(sc, &tap_listhead, tap_link) { if (minor(sc->tap_dev) == unit) return (sc); } return (NULL); } /* * Create a new tap instance via ifconfig. */ static int tap_clone_create(struct if_clone *ifc __unused, int unit, caddr_t params __unused, caddr_t data) { struct tap_softc *sc; cdev_t dev = (cdev_t)data; int flags; if (tapfind(unit) != NULL) return (EEXIST); if (dev == NULL) { if (!devfs_clone_bitmap_chk(&DEVFS_CLONE_BITMAP(tap), unit)) { devfs_clone_bitmap_set(&DEVFS_CLONE_BITMAP(tap), unit); dev = make_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL, 0600, "%s%d", TAP, unit); } else { dev = devfs_find_device_by_name("%s%d", TAP, unit); if (dev == NULL) return (ENOENT); } flags = TAP_MANUALMAKE; } else { flags = 0; } if ((sc = tapcreate(dev, flags)) == NULL) return (ENOMEM); sc->tap_flags |= TAP_CLONE; TAPDEBUG(&sc->tap_if, "clone created, minor = %#x, flags = 0x%x\n", minor(sc->tap_dev), sc->tap_flags); return (0); } /* * Open the tap device. */ static int tapopen(struct dev_open_args *ap) { cdev_t dev = NULL; struct tap_softc *sc = NULL; struct ifnet *ifp = NULL; int error; if (tapuopen == 0 && (error = caps_priv_check(ap->a_cred, SYSCAP_RESTRICTEDROOT)) != 0) { return (error); } get_mplock(); dev = ap->a_head.a_dev; sc = dev->si_drv1; if (sc == NULL && (sc = tapcreate(dev, 0)) == NULL) { rel_mplock(); return (ENOMEM); } if (sc->tap_flags & TAP_OPEN) { rel_mplock(); return (EBUSY); } ifp = &sc->tap_if; bcopy(sc->arpcom.ac_enaddr, sc->ether_addr, sizeof(sc->ether_addr)); if (curthread->td_proc) fsetown(curthread->td_proc->p_pid, &sc->tap_sigtd); sc->tap_flags |= TAP_OPEN; taprefcnt++; if (tapuponopen && (ifp->if_flags & IFF_UP) == 0) { crit_enter(); if_up(ifp); crit_exit(); ifnet_serialize_all(ifp); tapifflags(sc); ifnet_deserialize_all(ifp); sc->tap_flags |= TAP_CLOSEDOWN; } TAPDEBUG(ifp, "opened, minor = %#x. Module refcnt = %d\n", minor(dev), taprefcnt); rel_mplock(); return (0); } static int tapclone(struct dev_clone_args *ap) { char ifname[IFNAMSIZ]; int unit; unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(tap), 0); ksnprintf(ifname, IFNAMSIZ, "%s%d", TAP, unit); ap->a_dev = make_only_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL, 0600, "%s", ifname); /* * Use the if_clone framework to create cloned device/interface, * so the two clone methods (autoclone device /dev/tap; ifconfig * clone) are consistent and can be mix used. * * Need to pass the cdev_t because the device created by * 'make_only_dev()' doesn't appear in '/dev' yet so that it can't * be found by 'devfs_find_device_by_name()' in 'tap_clone_create()'. */ return (if_clone_create(ifname, IFNAMSIZ, NULL, (caddr_t)ap->a_dev)); } /* * Close the tap device: bring the interface down & delete routing info. */ static int tapclose(struct dev_close_args *ap) { cdev_t dev = ap->a_head.a_dev; struct tap_softc *sc = dev->si_drv1; struct ifnet *ifp; int unit = minor(dev); int clear_flags = 0; char ifname[IFNAMSIZ]; KASSERT(sc != NULL, ("try closing the already destroyed %s%d", TAP, unit)); ifp = &sc->tap_if; get_mplock(); /* Junk all pending output */ ifq_purge_all(&ifp->if_snd); /* * If the interface is not cloned, we always bring it down. * * If the interface is cloned, then we bring it down during * closing only if it was brought up during opening. */ if ((sc->tap_flags & TAP_CLONE) == 0 || (sc->tap_flags & TAP_CLOSEDOWN)) { if (ifp->if_flags & IFF_UP) if_down(ifp); clear_flags = 1; } ifnet_serialize_all(ifp); tapifstop(sc, clear_flags); ifnet_deserialize_all(ifp); if ((sc->tap_flags & TAP_MANUALMAKE) == 0) { if_purgeaddrs_nolink(ifp); EVENTHANDLER_INVOKE(ifnet_detach_event, ifp); /* Announce the departure of the interface. */ rt_ifannouncemsg(ifp, IFAN_DEPARTURE); } funsetown(&sc->tap_sigio); sc->tap_sigio = NULL; KNOTE(&sc->tap_rkq.ki_note, 0); sc->tap_flags &= ~TAP_OPEN; funsetown(&sc->tap_sigtd); sc->tap_sigtd = NULL; taprefcnt--; if (taprefcnt < 0) { taprefcnt = 0; if_printf(ifp, ". Module refcnt = %d is out of sync! " "Force refcnt to be 0.\n", taprefcnt); } TAPDEBUG(ifp, "closed, minor = %#x. Module refcnt = %d\n", unit, taprefcnt); /* Only auto-destroy if the interface was not manually created. */ if ((sc->tap_flags & TAP_MANUALMAKE) == 0) { ksnprintf(ifname, IFNAMSIZ, "%s%d", TAP, unit); if_clone_destroy(ifname); } rel_mplock(); return (0); } /* * Destroy a tap instance: the interface and the associated device. */ static void tapdestroy(struct tap_softc *sc) { struct ifnet *ifp = &sc->tap_if; cdev_t dev = sc->tap_dev; int unit = minor(dev); TAPDEBUG(ifp, "destroyed, minor = %#x. Module refcnt = %d\n", unit, taprefcnt); ifnet_serialize_all(ifp); tapifstop(sc, 1); ifnet_deserialize_all(ifp); ether_ifdetach(ifp); sc->tap_dev = NULL; dev->si_drv1 = NULL; release_dev(dev); /* device disassociation */ /* Also destroy the cloned device */ destroy_dev(dev); devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(tap), unit); SLIST_REMOVE(&tap_listhead, sc, tap_softc, tap_link); kfree(sc, M_TAP); } /* * Destroy a tap instance that is created via ifconfig. */ static int tap_clone_destroy(struct ifnet *ifp) { struct tap_softc *sc = ifp->if_softc; if (sc->tap_flags & TAP_OPEN) return (EBUSY); if ((sc->tap_flags & TAP_CLONE) == 0) return (EINVAL); TAPDEBUG(ifp, "clone destroyed, minor = %#x, flags = 0x%x\n", minor(sc->tap_dev), sc->tap_flags); tapdestroy(sc); return (0); } /* * tapifinit * * Network interface initialization function (called with if serializer held) * * MPSAFE */ static void tapifinit(void *xtp) { struct tap_softc *sc = xtp; struct ifnet *ifp = &sc->tap_if; struct ifaltq_subque *ifsq = ifq_get_subq_default(&ifp->if_snd); TAPDEBUG(ifp, "initializing, minor = %#x, flags = 0x%x\n", minor(sc->tap_dev), sc->tap_flags); ASSERT_IFNET_SERIALIZED_ALL(ifp); tapifstop(sc, 1); ifp->if_flags |= IFF_RUNNING; ifsq_clr_oactive(ifsq); /* attempt to start output */ tapifstart(ifp, ifsq); } static void tapifflags(struct tap_softc *sc) { struct ifnet *ifp = &sc->tap_if; ASSERT_IFNET_SERIALIZED_ALL(ifp); if (ifp->if_flags & IFF_UP) { if ((ifp->if_flags & IFF_RUNNING) == 0) tapifinit(sc); } else { tapifstop(sc, 1); } } /* * tapifioctl * * Process an ioctl request on network interface (called with if serializer * held). * * MPSAFE */ static int tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) { struct tap_softc *sc = ifp->if_softc; struct ifreq *ifr = NULL; struct ifstat *ifs = NULL; struct ifmediareq *ifmr = NULL; int error = 0; int dummy; switch (cmd) { case SIOCADDMULTI: case SIOCDELMULTI: break; case SIOCSIFMTU: ifr = (struct ifreq *)data; ifp->if_mtu = ifr->ifr_mtu; TAPDEBUG(ifp, "mtu set\n"); break; case SIOCSIFADDR: case SIOCGIFADDR: error = ether_ioctl(ifp, cmd, data); break; case SIOCSIFFLAGS: tapifflags(sc); break; case SIOCGIFMEDIA: /* * The bridge code needs this when running the * spanning tree protocol. */ ifmr = (struct ifmediareq *)data; dummy = ifmr->ifm_count; ifmr->ifm_count = 1; ifmr->ifm_status = IFM_AVALID; ifmr->ifm_active = IFM_ETHER; if (sc->tap_flags & TAP_OPEN) ifmr->ifm_status |= IFM_ACTIVE; ifmr->ifm_current = ifmr->ifm_active; if (dummy >= 1) { int media = IFM_ETHER; error = copyout(&media, ifmr->ifm_ulist, sizeof(int)); } break; case SIOCGIFSTATUS: ifs = (struct ifstat *)data; dummy = strlen(ifs->ascii); if ((sc->tap_flags & TAP_OPEN) && dummy < sizeof(ifs->ascii)) { if (sc->tap_sigtd && sc->tap_sigtd->sio_proc) { ksnprintf(ifs->ascii + dummy, sizeof(ifs->ascii) - dummy, "\tOpened by pid %d\n", (int)sc->tap_sigtd->sio_proc->p_pid); } else { ksnprintf(ifs->ascii + dummy, sizeof(ifs->ascii) - dummy, "\tOpened by \n"); } } break; default: error = EINVAL; break; } return (error); } /* * tapifstart * * Queue packets from higher level ready to put out (called with if serializer * held) * * MPSAFE */ static void tapifstart(struct ifnet *ifp, struct ifaltq_subque *ifsq) { struct tap_softc *sc = ifp->if_softc; struct ifqueue *ifq; struct mbuf *m; int has_data = 0; ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq); TAPDEBUG(ifp, "starting, minor = %#x\n", minor(sc->tap_dev)); if ((sc->tap_flags & TAP_READY) != TAP_READY) { TAPDEBUG(ifp, "not ready, minor = %#x, flags = 0x%x\n", minor(sc->tap_dev), sc->tap_flags); ifsq_purge(ifsq); return; } ifsq_set_oactive(ifsq); ifq = &sc->tap_devq; while ((m = ifsq_dequeue(ifsq)) != NULL) { if (IF_QFULL(ifq)) { IF_DROP(ifq); IFNET_STAT_INC(ifp, oerrors, 1); m_freem(m); } else { IF_ENQUEUE(ifq, m); IFNET_STAT_INC(ifp, opackets, 1); has_data = 1; } } if (has_data) { if (sc->tap_flags & TAP_RWAIT) { sc->tap_flags &= ~TAP_RWAIT; wakeup((caddr_t)sc); } KNOTE(&sc->tap_rkq.ki_note, 0); if ((sc->tap_flags & TAP_ASYNC) && (sc->tap_sigio != NULL)) { get_mplock(); pgsigio(sc->tap_sigio, SIGIO, 0); rel_mplock(); } } ifsq_clr_oactive(ifsq); } static void tapifstop(struct tap_softc *sc, int clear_flags) { struct ifnet *ifp = &sc->tap_if; ASSERT_IFNET_SERIALIZED_ALL(ifp); IF_DRAIN(&sc->tap_devq); sc->tap_flags &= ~TAP_CLOSEDOWN; if (clear_flags) { ifp->if_flags &= ~IFF_RUNNING; ifsq_clr_oactive(ifq_get_subq_default(&ifp->if_snd)); } } /* * tapioctl * * The ops interface is now pretty minimal. Called via fileops with nothing * held. * * MPSAFE */ static int tapioctl(struct dev_ioctl_args *ap) { cdev_t dev = ap->a_head.a_dev; caddr_t data = ap->a_data; struct tap_softc *sc = dev->si_drv1; struct ifnet *ifp = &sc->tap_if; struct ifreq *ifr; struct tapinfo *tapp = NULL; struct mbuf *mb; int error; ifnet_serialize_all(ifp); error = 0; switch (ap->a_cmd) { case TAPSIFINFO: tapp = (struct tapinfo *)data; if (ifp->if_type != tapp->type) return (EPROTOTYPE); ifp->if_mtu = tapp->mtu; ifp->if_baudrate = tapp->baudrate; break; case TAPGIFINFO: tapp = (struct tapinfo *)data; tapp->mtu = ifp->if_mtu; tapp->type = ifp->if_type; tapp->baudrate = ifp->if_baudrate; break; case TAPGIFNAME: ifr = (struct ifreq *)data; strlcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ); break; case TAPSDEBUG: tapdebug = *(int *)data; break; case TAPGDEBUG: *(int *)data = tapdebug; break; case FIOASYNC: if (*(int *)data) sc->tap_flags |= TAP_ASYNC; else sc->tap_flags &= ~TAP_ASYNC; break; case FIONREAD: /* Take a look at devq first */ IF_POLL(&sc->tap_devq, mb); if (mb != NULL) { *(int *)data = 0; for(; mb != NULL; mb = mb->m_next) *(int *)data += mb->m_len; } else { *(int *)data = ifsq_poll_pktlen( ifq_get_subq_default(&ifp->if_snd)); } break; case FIOSETOWN: error = fsetown(*(int *)data, &sc->tap_sigio); if (error == 0) error = fsetown(*(int *)data, &sc->tap_sigtd); break; case FIOGETOWN: *(int *)data = fgetown(&sc->tap_sigio); break; /* this is deprecated, FIOSETOWN should be used instead */ case TIOCSPGRP: error = fsetown(-(*(int *)data), &sc->tap_sigio); break; /* this is deprecated, FIOGETOWN should be used instead */ case TIOCGPGRP: *(int *)data = -fgetown(&sc->tap_sigio); break; /* * Support basic control of the network interface via the device file. * e.g., vke(4) currently uses the 'SIOCGIFADDR' ioctl. */ case SIOCGIFFLAGS: bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags)); break; case SIOCGIFADDR: bcopy(sc->ether_addr, data, sizeof(sc->ether_addr)); break; case SIOCSIFADDR: bcopy(data, sc->ether_addr, sizeof(sc->ether_addr)); break; default: error = ENOTTY; break; } ifnet_deserialize_all(ifp); return (error); } /* * tapread * * The ops read interface - reads a packet at a time, or at * least as much of a packet as can be read. * * Called from the fileops interface with nothing held. * * MPSAFE */ static int tapread(struct dev_read_args *ap) { cdev_t dev = ap->a_head.a_dev; struct uio *uio = ap->a_uio; struct tap_softc *sc = dev->si_drv1; struct ifnet *ifp = &sc->tap_if; struct mbuf *m0 = NULL; int error = 0, len; TAPDEBUG(ifp, "reading, minor = %#x\n", minor(dev)); if ((sc->tap_flags & TAP_READY) != TAP_READY) { TAPDEBUG(ifp, "not ready, minor = %#x, flags = 0x%x\n", minor(dev), sc->tap_flags); return (EHOSTDOWN); } sc->tap_flags &= ~TAP_RWAIT; /* sleep until we get a packet */ do { ifnet_serialize_all(ifp); IF_DEQUEUE(&sc->tap_devq, m0); if (m0 == NULL) { if (ap->a_ioflag & IO_NDELAY) { ifnet_deserialize_all(ifp); return (EWOULDBLOCK); } sc->tap_flags |= TAP_RWAIT; tsleep_interlock(sc, PCATCH); ifnet_deserialize_all(ifp); error = tsleep(sc, PCATCH | PINTERLOCKED, "taprd", 0); if (error) return (error); } else { ifnet_deserialize_all(ifp); } } while (m0 == NULL); BPF_MTAP(ifp, m0); /* xfer packet to user space */ while ((m0 != NULL) && (uio->uio_resid > 0) && (error == 0)) { len = (int)szmin(uio->uio_resid, m0->m_len); if (len == 0) break; error = uiomove(mtod(m0, caddr_t), (size_t)len, uio); m0 = m_free(m0); } if (m0 != NULL) { TAPDEBUG(ifp, "dropping mbuf, minor = %#x\n", minor(dev)); m_freem(m0); } return (error); } /* * tapwrite * * The ops write interface - an atomic write is a packet - or else! * * Called from the fileops interface with nothing held. * * MPSAFE */ static int tapwrite(struct dev_write_args *ap) { cdev_t dev = ap->a_head.a_dev; struct uio *uio = ap->a_uio; struct tap_softc *sc = dev->si_drv1; struct ifnet *ifp = &sc->tap_if; struct mbuf *top = NULL, **mp = NULL, *m = NULL; int error; size_t tlen, mlen; TAPDEBUG(ifp, "writing, minor = %#x\n", minor(dev)); if ((sc->tap_flags & TAP_READY) != TAP_READY) { TAPDEBUG(ifp, "not ready, minor = %#x, flags = 0x%x\n", minor(dev), sc->tap_flags); return (EHOSTDOWN); } if (uio->uio_resid == 0) return (0); if (uio->uio_resid > TAPMRU) { TAPDEBUG(ifp, "invalid packet len = %zu, minor = %#x\n", uio->uio_resid, minor(dev)); return (EIO); } tlen = uio->uio_resid; /* get a header mbuf */ MGETHDR(m, M_WAITOK, MT_DATA); mlen = MHLEN; top = NULL; mp = ⊤ error = 0; while (error == 0 && uio->uio_resid > 0) { m->m_len = (int)szmin(mlen, uio->uio_resid); error = uiomove(mtod(m, caddr_t), (size_t)m->m_len, uio); *mp = m; mp = &m->m_next; if (uio->uio_resid > 0) { MGET(m, M_WAITOK, MT_DATA); mlen = MLEN; } } if (error) { IFNET_STAT_INC(ifp, ierrors, 1); if (top) m_freem(top); return (error); } top->m_pkthdr.len = (int)tlen; top->m_pkthdr.rcvif = ifp; /* * Ethernet bridge and bpf are handled in ether_input * * adjust mbuf and give packet to the ether_input */ ifnet_serialize_all(ifp); ifp->if_input(ifp, top, NULL, -1); IFNET_STAT_INC(ifp, ipackets, 1); /* ibytes are counted in ether_input */ ifnet_deserialize_all(ifp); return (0); } /* * tapkqfilter - called from the fileops interface with nothing held * * MPSAFE */ static int tapkqfilter(struct dev_kqfilter_args *ap) { cdev_t dev = ap->a_head.a_dev; struct knote *kn = ap->a_kn; struct tap_softc *sc = dev->si_drv1; struct klist *list; list = &sc->tap_rkq.ki_note; ap->a_result =0; switch (kn->kn_filter) { case EVFILT_READ: kn->kn_fop = &tapread_filtops; kn->kn_hook = (void *)sc; break; case EVFILT_WRITE: kn->kn_fop = &tapwrite_filtops; kn->kn_hook = (void *)sc; break; default: ap->a_result = EOPNOTSUPP; return (0); } knote_insert(list, kn); return (0); } static int tap_filter_read(struct knote *kn, long hint) { struct tap_softc *sc = (struct tap_softc *)kn->kn_hook; int ready = 0; if (!IF_QEMPTY(&sc->tap_devq)) { /* XXX serializer */ if ((kn->kn_sfflags & NOTE_HUPONLY) == 0) ready = 1; } return ready; } static int tap_filter_write(struct knote *kn, long hint) { /* Always ready for a write */ return (1); } static void tap_filter_detach(struct knote *kn) { struct tap_softc *sc = (struct tap_softc *)kn->kn_hook; knote_remove(&sc->tap_rkq.ki_note, kn); }