/* * 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. */ /* * $FreeBSD$ * $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 /* XXX: Shouldn't really be required! */ #include #include #include #include #include #include #include #include #include #include #define CDEV_NAME "tap" #define CDEV_MAJOR 149 #define TAPDEBUG if (tapdebug) printf #define TAP "tap" #define VMNET "vmnet" #define TAPMAXUNIT 0x7fff #define VMNET_DEV_MASK 0x00800000 /* 0x007f00ff */ /* module */ static int tapmodevent(module_t, int, void *); /* device */ static void tapclone(void *, char *, int, dev_t *); static void tapcreate(dev_t); /* network interface */ static void tapifstart(struct ifnet *); static int tapifioctl(struct ifnet *, u_long, caddr_t); static void tapifinit(void *); /* character device */ static d_open_t tapopen; static d_close_t tapclose; static d_read_t tapread; static d_write_t tapwrite; static d_ioctl_t tapioctl; static d_poll_t tappoll; static struct cdevsw tap_cdevsw = { /* open */ tapopen, /* close */ tapclose, /* read */ tapread, /* write */ tapwrite, /* ioctl */ tapioctl, /* poll */ tappoll, /* mmap */ nommap, /* startegy */ nostrategy, /* dev name */ CDEV_NAME, /* dev major */ CDEV_MAJOR, /* dump */ nodump, /* psize */ nopsize, /* flags */ 0, }; static int tapdebug = 0; /* debug flag */ static SLIST_HEAD(, tap_softc) taphead; /* first device */ static udev_t tapbasedev = NOUDEV; /* base device */ static struct rman tapdevunits[2]; /* device units */ #define tapunits tapdevunits #define vmnetunits (tapdevunits + 1) MALLOC_DECLARE(M_TAP); MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface"); SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, ""); DEV_MODULE(if_tap, tapmodevent, NULL); /* * tapmodevent * * module event handler */ static int tapmodevent(mod, type, data) module_t mod; int type; void *data; { static eventhandler_tag eh_tag = NULL; struct tap_softc *tp = NULL; struct ifnet *ifp = NULL; int error, s; switch (type) { case MOD_LOAD: /* initialize resources */ tapunits->rm_type = RMAN_ARRAY; tapunits->rm_descr = "open tap units"; vmnetunits->rm_type = RMAN_ARRAY; vmnetunits->rm_descr = "open vmnet units"; error = rman_init(tapunits); if (error != 0) goto bail; error = rman_init(vmnetunits); if (error != 0) goto bail1; error = rman_manage_region(tapunits, 0, TAPMAXUNIT); if (error != 0) goto bail2; error = rman_manage_region(vmnetunits, 0, TAPMAXUNIT); if (error != 0) goto bail2; /* intitialize device */ SLIST_INIT(&taphead); eh_tag = EVENTHANDLER_REGISTER(dev_clone, tapclone, 0, 1000); if (eh_tag == NULL) { error = ENOMEM; goto bail2; } return (0); bail2: rman_fini(vmnetunits); bail1: rman_fini(tapunits); bail: return (error); case MOD_UNLOAD: SLIST_FOREACH(tp, &taphead, tap_next) if (tp->tap_unit != NULL) return (EBUSY); EVENTHANDLER_DEREGISTER(dev_clone, eh_tag); error = rman_fini(tapunits); KASSERT((error == 0), ("Could not fini tap units")); error = rman_fini(vmnetunits); KASSERT((error == 0), ("Could not fini vmnet units")); while ((tp = SLIST_FIRST(&taphead)) != NULL) { SLIST_REMOVE_HEAD(&taphead, tap_next); ifp = &tp->tap_if; TAPDEBUG("detaching %s%d\n", ifp->if_name,ifp->if_unit); KASSERT(!(tp->tap_flags & TAP_OPEN), ("%s%d flags is out of sync", ifp->if_name, ifp->if_unit)); /* XXX makedev check? nah.. not right now :) */ s = splimp(); ether_ifdetach(ifp); splx(s); free(tp, M_TAP); } if (tapbasedev != NOUDEV) destroy_dev(udev2dev(tapbasedev, 0)); break; default: return (EOPNOTSUPP); } return (0); } /* tapmodevent */ /* * DEVFS handler * * We need to support two kind of devices - tap and vmnet */ static void tapclone(arg, name, namelen, dev) void *arg; char *name; int namelen; dev_t *dev; { int unit, minor = 0 /* XXX avoid warning */ , error; char *device_name = name; struct resource *r = NULL; if (*dev != NODEV) return; if (strcmp(device_name, TAP) == 0) { /* get first free tap unit */ r = rman_reserve_resource(tapunits, 0, TAPMAXUNIT, 1, RF_ALLOCATED | RF_ACTIVE, NULL); unit = rman_get_start(r); minor = unit2minor(unit); } else if (strcmp(device_name, VMNET) == 0) { /* get first free vmnet unit */ r = rman_reserve_resource(vmnetunits, 0, TAPMAXUNIT, 1, RF_ALLOCATED | RF_ACTIVE, NULL); unit = rman_get_start(r); minor = unit2minor(unit) | VMNET_DEV_MASK; } if (r != NULL) { /* need cloning */ TAPDEBUG("%s%d is available. minor = %#x\n", device_name, unit, minor); error = rman_release_resource(r); KASSERT((error == 0), ("Could not release tap/vmnet unit")); /* check if device for the unit has been created */ *dev = makedev(CDEV_MAJOR, minor); if ((*dev)->si_flags & SI_NAMED) { TAPDEBUG("%s%d device exists. minor = %#x\n", device_name, unit, minor); return; /* device has been created */ } } else { /* try to match name/unit, first try tap then vmnet */ device_name = TAP; if (dev_stdclone(name, NULL, device_name, &unit) != 1) { device_name = VMNET; if (dev_stdclone(name, NULL, device_name, &unit) != 1) return; minor = unit2minor(unit) | VMNET_DEV_MASK; } else minor = unit2minor(unit); } TAPDEBUG("make_dev(%s%d). minor = %#x\n", device_name, unit, minor); *dev = make_dev(&tap_cdevsw, minor, UID_ROOT, GID_WHEEL, 0600, "%s%d", device_name, unit); if (tapbasedev == NOUDEV) tapbasedev = (*dev)->si_udev; else { (*dev)->si_flags |= SI_CHEAPCLONE; dev_depends(udev2dev(tapbasedev, 0), *dev); } } /* tapclone */ /* * tapcreate * * to create interface */ static void tapcreate(dev) dev_t dev; { struct ifnet *ifp = NULL; struct tap_softc *tp = NULL; unsigned short macaddr_hi; int unit, s; char *name = NULL; /* allocate driver storage and create device */ MALLOC(tp, struct tap_softc *, sizeof(*tp), M_TAP, M_WAITOK | M_ZERO); SLIST_INSERT_HEAD(&taphead, tp, tap_next); unit = dev2unit(dev) & TAPMAXUNIT; /* select device: tap or vmnet */ if (minor(dev) & VMNET_DEV_MASK) { name = VMNET; tp->tap_flags |= TAP_VMNET; } else name = TAP; TAPDEBUG("tapcreate(%s%d). minor = %#x\n", name, unit, minor(dev)); if (!(dev->si_flags & SI_NAMED)) dev = make_dev(&tap_cdevsw, minor(dev), UID_ROOT, GID_WHEEL, 0600, "%s%d", name, unit); /* generate fake MAC address: 00 bd xx xx xx unit_no */ macaddr_hi = htons(0x00bd); bcopy(&macaddr_hi, &tp->arpcom.ac_enaddr[0], sizeof(short)); bcopy(&ticks, &tp->arpcom.ac_enaddr[2], sizeof(long)); tp->arpcom.ac_enaddr[5] = (u_char)unit; /* fill the rest and attach interface */ ifp = &tp->tap_if; ifp->if_softc = tp; ifp->if_unit = unit; ifp->if_name = name; ifp->if_init = tapifinit; ifp->if_start = tapifstart; ifp->if_ioctl = tapifioctl; ifp->if_mtu = ETHERMTU; ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST); ifp->if_snd.ifq_maxlen = ifqmaxlen; dev->si_drv1 = tp; s = splimp(); ether_ifattach(ifp, tp->arpcom.ac_enaddr); splx(s); tp->tap_flags |= TAP_INITED; TAPDEBUG("interface %s%d is created. minor = %#x\n", ifp->if_name, ifp->if_unit, minor(dev)); } /* tapcreate */ /* * tapopen * * to open tunnel. must be superuser */ static int tapopen(dev, flag, mode, td) dev_t dev; int flag; int mode; struct thread *td; { struct tap_softc *tp = NULL; int unit, error; struct resource *r = NULL; if ((error = suser(td)) != 0) return (error); unit = dev2unit(dev) & TAPMAXUNIT; if (minor(dev) & VMNET_DEV_MASK) r = rman_reserve_resource(vmnetunits, unit, unit, 1, RF_ALLOCATED | RF_ACTIVE, NULL); else r = rman_reserve_resource(tapunits, unit, unit, 1, RF_ALLOCATED | RF_ACTIVE, NULL); if (r == NULL) return (EBUSY); dev->si_flags &= ~SI_CHEAPCLONE; tp = dev->si_drv1; if (tp == NULL) { tapcreate(dev); tp = dev->si_drv1; } KASSERT(!(tp->tap_flags & TAP_OPEN), ("%s%d flags is out of sync", tp->tap_if.if_name, unit)); bcopy(tp->arpcom.ac_enaddr, tp->ether_addr, sizeof(tp->ether_addr)); tp->tap_unit = r; tp->tap_pid = td->td_proc->p_pid; tp->tap_flags |= TAP_OPEN; TAPDEBUG("%s%d is open. minor = %#x\n", tp->tap_if.if_name, unit, minor(dev)); return (0); } /* tapopen */ /* * tapclose * * close the device - mark i/f down & delete routing info */ static int tapclose(dev, foo, bar, td) dev_t dev; int foo; int bar; struct thread *td; { int s, error; struct tap_softc *tp = dev->si_drv1; struct ifnet *ifp = &tp->tap_if; KASSERT((tp->tap_unit != NULL), ("%s%d is not open", ifp->if_name, ifp->if_unit)); /* junk all pending output */ IF_DRAIN(&ifp->if_snd); /* * do not bring the interface down, and do not anything with * interface, if we are in VMnet mode. just close the device. */ if (((tp->tap_flags & TAP_VMNET) == 0) && (ifp->if_flags & IFF_UP)) { s = splimp(); if_down(ifp); if (ifp->if_flags & IFF_RUNNING) { /* find internet addresses and delete routes */ struct ifaddr *ifa = NULL; TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { if (ifa->ifa_addr->sa_family == AF_INET) { rtinit(ifa, (int)RTM_DELETE, 0); /* remove address from interface */ bzero(ifa->ifa_addr, sizeof(*(ifa->ifa_addr))); bzero(ifa->ifa_dstaddr, sizeof(*(ifa->ifa_dstaddr))); bzero(ifa->ifa_netmask, sizeof(*(ifa->ifa_netmask))); } } ifp->if_flags &= ~IFF_RUNNING; } splx(s); } funsetown(&tp->tap_sigio); selwakeup(&tp->tap_rsel); tp->tap_flags &= ~TAP_OPEN; tp->tap_pid = 0; error = rman_release_resource(tp->tap_unit); KASSERT((error == 0), ("%s%d could not release unit", ifp->if_name, ifp->if_unit)); tp->tap_unit = NULL; TAPDEBUG("%s%d is closed. minor = %#x\n", ifp->if_name, ifp->if_unit, minor(dev)); return (0); } /* tapclose */ /* * tapifinit * * network interface initialization function */ static void tapifinit(xtp) void *xtp; { struct tap_softc *tp = (struct tap_softc *)xtp; struct ifnet *ifp = &tp->tap_if; TAPDEBUG("initializing %s%d\n", ifp->if_name, ifp->if_unit); ifp->if_flags |= IFF_RUNNING; ifp->if_flags &= ~IFF_OACTIVE; /* attempt to start output */ tapifstart(ifp); } /* tapifinit */ /* * tapifioctl * * Process an ioctl request on network interface */ static int tapifioctl(ifp, cmd, data) struct ifnet *ifp; u_long cmd; caddr_t data; { struct tap_softc *tp = (struct tap_softc *)(ifp->if_softc); struct ifstat *ifs = NULL; int s, dummy; switch (cmd) { case SIOCSIFFLAGS: /* XXX -- just like vmnet does */ case SIOCADDMULTI: case SIOCDELMULTI: break; case SIOCGIFSTATUS: s = splimp(); ifs = (struct ifstat *)data; dummy = strlen(ifs->ascii); if (tp->tap_pid != 0 && dummy < sizeof(ifs->ascii)) snprintf(ifs->ascii + dummy, sizeof(ifs->ascii) - dummy, "\tOpened by PID %d\n", tp->tap_pid); splx(s); break; default: s = splimp(); dummy = ether_ioctl(ifp, cmd, data); splx(s); return (dummy); } return (0); } /* tapifioctl */ /* * tapifstart * * queue packets from higher level ready to put out */ static void tapifstart(ifp) struct ifnet *ifp; { struct tap_softc *tp = ifp->if_softc; int s; TAPDEBUG("%s%d starting\n", ifp->if_name, ifp->if_unit); /* * do not junk pending output if we are in VMnet mode. * XXX: can this do any harm because of queue overflow? */ if (((tp->tap_flags & TAP_VMNET) == 0) && ((tp->tap_flags & TAP_READY) != TAP_READY)) { struct mbuf *m = NULL; TAPDEBUG("%s%d not ready, tap_flags = 0x%x\n", ifp->if_name, ifp->if_unit, tp->tap_flags); s = splimp(); do { IF_DEQUEUE(&ifp->if_snd, m); if (m != NULL) m_freem(m); ifp->if_oerrors ++; } while (m != NULL); splx(s); return; } s = splimp(); ifp->if_flags |= IFF_OACTIVE; if (ifp->if_snd.ifq_len != 0) { if (tp->tap_flags & TAP_RWAIT) { tp->tap_flags &= ~TAP_RWAIT; wakeup((caddr_t)tp); } if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) pgsigio(&tp->tap_sigio, SIGIO, 0); selwakeup(&tp->tap_rsel); ifp->if_opackets ++; /* obytes are counted in ether_output */ } ifp->if_flags &= ~IFF_OACTIVE; splx(s); } /* tapifstart */ /* * tapioctl * * the cdevsw interface is now pretty minimal */ static int tapioctl(dev, cmd, data, flag, td) dev_t dev; u_long cmd; caddr_t data; int flag; struct thread *td; { struct tap_softc *tp = dev->si_drv1; struct ifnet *ifp = &tp->tap_if; struct tapinfo *tapp = NULL; int s; int f; switch (cmd) { case TAPSIFINFO: s = splimp(); tapp = (struct tapinfo *)data; ifp->if_mtu = tapp->mtu; ifp->if_type = tapp->type; ifp->if_baudrate = tapp->baudrate; splx(s); break; case TAPGIFINFO: tapp = (struct tapinfo *)data; tapp->mtu = ifp->if_mtu; tapp->type = ifp->if_type; tapp->baudrate = ifp->if_baudrate; break; case TAPSDEBUG: tapdebug = *(int *)data; break; case TAPGDEBUG: *(int *)data = tapdebug; break; case FIONBIO: break; case FIOASYNC: s = splimp(); if (*(int *)data) tp->tap_flags |= TAP_ASYNC; else tp->tap_flags &= ~TAP_ASYNC; splx(s); break; case FIONREAD: s = splimp(); if (ifp->if_snd.ifq_head) { struct mbuf *mb = ifp->if_snd.ifq_head; for(*(int *)data = 0;mb != NULL;mb = mb->m_next) *(int *)data += mb->m_len; } else *(int *)data = 0; splx(s); break; case FIOSETOWN: return (fsetown(*(int *)data, &tp->tap_sigio)); case FIOGETOWN: *(int *)data = fgetown(&tp->tap_sigio); return (0); /* this is deprecated, FIOSETOWN should be used instead */ case TIOCSPGRP: return (fsetown(-(*(int *)data), &tp->tap_sigio)); /* this is deprecated, FIOGETOWN should be used instead */ case TIOCGPGRP: *(int *)data = -fgetown(&tp->tap_sigio); return (0); /* VMware/VMnet port ioctl's */ case SIOCGIFFLAGS: /* get ifnet flags */ bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags)); break; case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ f = *(int *)data; f &= 0x0fff; f &= ~IFF_CANTCHANGE; f |= IFF_UP; s = splimp(); ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE); splx(s); break; case OSIOCGIFADDR: /* get MAC address of the remote side */ case SIOCGIFADDR: bcopy(tp->ether_addr, data, sizeof(tp->ether_addr)); break; case SIOCSIFADDR: /* set MAC address of the remote side */ bcopy(data, tp->ether_addr, sizeof(tp->ether_addr)); break; default: return (ENOTTY); } return (0); } /* tapioctl */ /* * tapread * * the cdevsw read interface - reads a packet at a time, or at * least as much of a packet as can be read */ static int tapread(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { struct tap_softc *tp = dev->si_drv1; struct ifnet *ifp = &tp->tap_if; struct mbuf *m = NULL; int error = 0, len, s; TAPDEBUG("%s%d reading, minor = %#x\n", ifp->if_name, ifp->if_unit, minor(dev)); if ((tp->tap_flags & TAP_READY) != TAP_READY) { TAPDEBUG("%s%d not ready. minor = %#x, tap_flags = 0x%x\n", ifp->if_name, ifp->if_unit, minor(dev), tp->tap_flags); return (EHOSTDOWN); } tp->tap_flags &= ~TAP_RWAIT; /* sleep until we get a packet */ do { s = splimp(); IF_DEQUEUE(&ifp->if_snd, m); splx(s); if (m == NULL) { if (flag & IO_NDELAY) return (EWOULDBLOCK); tp->tap_flags |= TAP_RWAIT; error = tsleep((caddr_t)tp,PCATCH|(PZERO+1),"taprd",0); if (error) return (error); } } while (m == NULL); /* feed packet to bpf */ BPF_MTAP(ifp, m); /* xfer packet to user space */ while ((m != NULL) && (uio->uio_resid > 0) && (error == 0)) { len = min(uio->uio_resid, m->m_len); if (len == 0) break; error = uiomove(mtod(m, caddr_t), len, uio); m = m_free(m); } if (m != NULL) { TAPDEBUG("%s%d dropping mbuf, minor = %#x\n", ifp->if_name, ifp->if_unit, minor(dev)); m_freem(m); } return (error); } /* tapread */ /* * tapwrite * * the cdevsw write interface - an atomic write is a packet - or else! */ static int tapwrite(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { struct tap_softc *tp = dev->si_drv1; struct ifnet *ifp = &tp->tap_if; struct mbuf *top = NULL, **mp = NULL, *m = NULL; int error = 0, tlen, mlen; TAPDEBUG("%s%d writting, minor = %#x\n", ifp->if_name, ifp->if_unit, minor(dev)); if (uio->uio_resid == 0) return (0); if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) { TAPDEBUG("%s%d invalid packet len = %d, minor = %#x\n", ifp->if_name, ifp->if_unit, uio->uio_resid, minor(dev)); return (EIO); } tlen = uio->uio_resid; /* get a header mbuf */ MGETHDR(m, M_DONTWAIT, MT_DATA); if (m == NULL) return (ENOBUFS); mlen = MHLEN; top = 0; mp = ⊤ while ((error == 0) && (uio->uio_resid > 0)) { m->m_len = min(mlen, uio->uio_resid); error = uiomove(mtod(m, caddr_t), m->m_len, uio); *mp = m; mp = &m->m_next; if (uio->uio_resid > 0) { MGET(m, M_DONTWAIT, MT_DATA); if (m == NULL) { error = ENOBUFS; break; } mlen = MLEN; } } if (error) { ifp->if_ierrors ++; if (top) m_freem(top); return (error); } top->m_pkthdr.len = tlen; top->m_pkthdr.rcvif = ifp; /* Pass packet up to parent. */ (*ifp->if_input)(ifp, top); ifp->if_ipackets ++; /* ibytes are counted in parent */ return (0); } /* tapwrite */ /* * tappoll * * the poll interface, this is only useful on reads * really. the write detect always returns true, write never blocks * anyway, it either accepts the packet or drops it */ static int tappoll(dev, events, td) dev_t dev; int events; struct thread *td; { struct tap_softc *tp = dev->si_drv1; struct ifnet *ifp = &tp->tap_if; int s, revents = 0; TAPDEBUG("%s%d polling, minor = %#x\n", ifp->if_name, ifp->if_unit, minor(dev)); s = splimp(); if (events & (POLLIN | POLLRDNORM)) { if (ifp->if_snd.ifq_len > 0) { TAPDEBUG("%s%d have data in queue. len = %d, " \ "minor = %#x\n", ifp->if_name, ifp->if_unit, ifp->if_snd.ifq_len, minor(dev)); revents |= (events & (POLLIN | POLLRDNORM)); } else { TAPDEBUG("%s%d waiting for data, minor = %#x\n", ifp->if_name, ifp->if_unit, minor(dev)); selrecord(td, &tp->tap_rsel); } } if (events & (POLLOUT | POLLWRNORM)) revents |= (events & (POLLOUT | POLLWRNORM)); splx(s); return (revents); } /* tappoll */