if_tap.c revision 126188
163670Snsayer/* 263670Snsayer * Copyright (C) 1999-2000 by Maksim Yevmenkin <m_evmenkin@yahoo.com> 363670Snsayer * All rights reserved. 463670Snsayer * 563670Snsayer * Redistribution and use in source and binary forms, with or without 663670Snsayer * modification, are permitted provided that the following conditions 763670Snsayer * are met: 863670Snsayer * 1. Redistributions of source code must retain the above copyright 963670Snsayer * notice, this list of conditions and the following disclaimer. 1063670Snsayer * 2. Redistributions in binary form must reproduce the above copyright 1163670Snsayer * notice, this list of conditions and the following disclaimer in the 1263670Snsayer * documentation and/or other materials provided with the distribution. 1363670Snsayer * 1463670Snsayer * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1563670Snsayer * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1663670Snsayer * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1763670Snsayer * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1863670Snsayer * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1963670Snsayer * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2063670Snsayer * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2163670Snsayer * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2263670Snsayer * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2363670Snsayer * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2463670Snsayer * SUCH DAMAGE. 2563670Snsayer * 2663670Snsayer * BASED ON: 2763670Snsayer * ------------------------------------------------------------------------- 2863670Snsayer * 2963670Snsayer * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk> 3063670Snsayer * Nottingham University 1987. 3163670Snsayer */ 3263670Snsayer 3363670Snsayer/* 3463670Snsayer * $FreeBSD: head/sys/net/if_tap.c 126188 2004-02-24 04:35:44Z bde $ 3563803Snsayer * $Id: if_tap.c,v 0.21 2000/07/23 21:46:02 max Exp $ 3663670Snsayer */ 3763670Snsayer 3863670Snsayer#include "opt_inet.h" 3963670Snsayer 4063670Snsayer#include <sys/param.h> 4163670Snsayer#include <sys/conf.h> 4263670Snsayer#include <sys/filedesc.h> 4363670Snsayer#include <sys/filio.h> 4463670Snsayer#include <sys/kernel.h> 4563670Snsayer#include <sys/malloc.h> 4663670Snsayer#include <sys/mbuf.h> 4763670Snsayer#include <sys/poll.h> 4863670Snsayer#include <sys/proc.h> 4963670Snsayer#include <sys/signalvar.h> 5063670Snsayer#include <sys/socket.h> 5163670Snsayer#include <sys/sockio.h> 5263670Snsayer#include <sys/sysctl.h> 5363670Snsayer#include <sys/systm.h> 5463670Snsayer#include <sys/ttycom.h> 5563670Snsayer#include <sys/uio.h> 5663670Snsayer#include <sys/vnode.h> 5783043Sbrooks#include <sys/queue.h> 5863670Snsayer 5963670Snsayer#include <net/bpf.h> 6063670Snsayer#include <net/ethernet.h> 6163670Snsayer#include <net/if.h> 6263670Snsayer#include <net/if_arp.h> 6363670Snsayer#include <net/route.h> 6463670Snsayer 6563670Snsayer#include <netinet/in.h> 6663670Snsayer 6763670Snsayer#include <net/if_tapvar.h> 6863670Snsayer#include <net/if_tap.h> 6963670Snsayer 7063670Snsayer 7163670Snsayer#define CDEV_NAME "tap" 7263670Snsayer#define TAPDEBUG if (tapdebug) printf 7363670Snsayer 7463670Snsayer#define TAP "tap" 7563670Snsayer#define VMNET "vmnet" 7683043Sbrooks#define TAPMAXUNIT 0x7fff 77126077Sphk#define VMNET_DEV_MASK CLONE_FLAG0 7863670Snsayer 7963670Snsayer/* module */ 80111742Sdesstatic int tapmodevent(module_t, int, void *); 8163670Snsayer 8263670Snsayer/* device */ 8393084Sbdestatic void tapclone(void *, char *, int, dev_t *); 8493084Sbdestatic void tapcreate(dev_t); 8563670Snsayer 8663670Snsayer/* network interface */ 8793084Sbdestatic void tapifstart(struct ifnet *); 8893084Sbdestatic int tapifioctl(struct ifnet *, u_long, caddr_t); 8993084Sbdestatic void tapifinit(void *); 9063670Snsayer 9163670Snsayer/* character device */ 9263670Snsayerstatic d_open_t tapopen; 9363670Snsayerstatic d_close_t tapclose; 9463670Snsayerstatic d_read_t tapread; 9563670Snsayerstatic d_write_t tapwrite; 9663670Snsayerstatic d_ioctl_t tapioctl; 9763670Snsayerstatic d_poll_t tappoll; 9863670Snsayer 9963670Snsayerstatic struct cdevsw tap_cdevsw = { 100126080Sphk .d_version = D_VERSION, 101126188Sbde .d_flags = D_PSEUDO | D_NEEDGIANT, 102111815Sphk .d_open = tapopen, 103111815Sphk .d_close = tapclose, 104111815Sphk .d_read = tapread, 105111815Sphk .d_write = tapwrite, 106111815Sphk .d_ioctl = tapioctl, 107111815Sphk .d_poll = tappoll, 108111815Sphk .d_name = CDEV_NAME, 10963670Snsayer}; 11063670Snsayer 11183043Sbrooksstatic int tapdebug = 0; /* debug flag */ 11283043Sbrooksstatic SLIST_HEAD(, tap_softc) taphead; /* first device */ 113126077Sphkstatic struct clonedevs *tapclones; 11463670Snsayer 11563670SnsayerMALLOC_DECLARE(M_TAP); 11663670SnsayerMALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface"); 11763670SnsayerSYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, ""); 11863670SnsayerDEV_MODULE(if_tap, tapmodevent, NULL); 11963670Snsayer 12063670Snsayer/* 12163670Snsayer * tapmodevent 12263670Snsayer * 12363670Snsayer * module event handler 12463670Snsayer */ 12563670Snsayerstatic int 12663670Snsayertapmodevent(mod, type, data) 12763670Snsayer module_t mod; 12863670Snsayer int type; 12963670Snsayer void *data; 13063670Snsayer{ 13183043Sbrooks static eventhandler_tag eh_tag = NULL; 13283043Sbrooks struct tap_softc *tp = NULL; 13383043Sbrooks struct ifnet *ifp = NULL; 134126077Sphk int s; 13563670Snsayer 13663670Snsayer switch (type) { 13763670Snsayer case MOD_LOAD: 13863670Snsayer 13983043Sbrooks /* intitialize device */ 14083043Sbrooks 14183043Sbrooks SLIST_INIT(&taphead); 14283043Sbrooks 14371602Sphk eh_tag = EVENTHANDLER_REGISTER(dev_clone, tapclone, 0, 1000); 144126077Sphk if (eh_tag == NULL) 145126077Sphk return (ENOMEM); 14683043Sbrooks return (0); 14763670Snsayer 14883043Sbrooks case MOD_UNLOAD: 14983043Sbrooks SLIST_FOREACH(tp, &taphead, tap_next) 150126077Sphk if (tp->tap_flags & TAP_OPEN) 15183043Sbrooks return (EBUSY); 15283043Sbrooks 15371602Sphk EVENTHANDLER_DEREGISTER(dev_clone, eh_tag); 15463670Snsayer 15583043Sbrooks while ((tp = SLIST_FIRST(&taphead)) != NULL) { 15683043Sbrooks SLIST_REMOVE_HEAD(&taphead, tap_next); 15783043Sbrooks 15883043Sbrooks ifp = &tp->tap_if; 15983043Sbrooks 160121816Sbrooks TAPDEBUG("detaching %s\n", ifp->if_xname); 16183043Sbrooks 162121816Sbrooks KASSERT(!(tp->tap_flags & TAP_OPEN), 163121816Sbrooks ("%s flags is out of sync", ifp->if_xname)); 16483043Sbrooks 165126077Sphk destroy_dev(tp->tap_dev); 16663670Snsayer s = splimp(); 167106939Ssam ether_ifdetach(ifp); 16863670Snsayer splx(s); 16963670Snsayer 17093752Sluigi free(tp, M_TAP); 17183043Sbrooks } 172126077Sphk clone_cleanup(&tapclones); 17363670Snsayer 17483043Sbrooks break; 17563670Snsayer 17663670Snsayer default: 17763670Snsayer return (EOPNOTSUPP); 17863670Snsayer } 17963670Snsayer 18063670Snsayer return (0); 18163670Snsayer} /* tapmodevent */ 18263670Snsayer 18363670Snsayer 18463670Snsayer/* 18571602Sphk * DEVFS handler 18671602Sphk * 18771602Sphk * We need to support two kind of devices - tap and vmnet 18871602Sphk */ 18971602Sphkstatic void 19071602Sphktapclone(arg, name, namelen, dev) 19171602Sphk void *arg; 19271602Sphk char *name; 19371602Sphk int namelen; 19471602Sphk dev_t *dev; 19571602Sphk{ 196126077Sphk u_int extra; 197126077Sphk int i, unit; 19883043Sbrooks char *device_name = name; 19971602Sphk 20071602Sphk if (*dev != NODEV) 20171602Sphk return; 20271602Sphk 203126077Sphk device_name = TAP; 204126077Sphk extra = 0; 205126077Sphk if (strcmp(name, TAP) == 0) { 206126077Sphk unit = -1; 207126077Sphk } else if (strcmp(name, VMNET) == 0) { 208126077Sphk device_name = VMNET; 209126077Sphk extra = VMNET_DEV_MASK; 210126077Sphk unit = -1; 211126077Sphk } else if (dev_stdclone(name, NULL, device_name, &unit) != 1) { 212126077Sphk device_name = VMNET; 213126077Sphk extra = VMNET_DEV_MASK; 214126077Sphk if (dev_stdclone(name, NULL, device_name, &unit) != 1) 215126077Sphk return; 21683043Sbrooks } 21771602Sphk 218126077Sphk /* find any existing device, or allocate new unit number */ 219126077Sphk i = clone_create(&tapclones, &tap_cdevsw, &unit, dev, extra); 220126077Sphk if (i) { 221126077Sphk *dev = make_dev(&tap_cdevsw, unit2minor(unit) | extra, 222126077Sphk UID_ROOT, GID_WHEEL, 0600, "%s%d", device_name, unit); 223126077Sphk if (*dev != NULL) 224126077Sphk (*dev)->si_flags |= SI_CHEAPCLONE; 22571602Sphk } 22671602Sphk} /* tapclone */ 22771602Sphk 22871602Sphk 22971602Sphk/* 23063670Snsayer * tapcreate 23163670Snsayer * 23263670Snsayer * to create interface 23363670Snsayer */ 23463670Snsayerstatic void 23563670Snsayertapcreate(dev) 23663670Snsayer dev_t dev; 23763670Snsayer{ 23863670Snsayer struct ifnet *ifp = NULL; 23963670Snsayer struct tap_softc *tp = NULL; 24063670Snsayer unsigned short macaddr_hi; 24163803Snsayer int unit, s; 24263670Snsayer char *name = NULL; 24363670Snsayer 244126077Sphk dev->si_flags &= ~SI_CHEAPCLONE; 245126077Sphk 24663670Snsayer /* allocate driver storage and create device */ 247111119Simp MALLOC(tp, struct tap_softc *, sizeof(*tp), M_TAP, M_WAITOK | M_ZERO); 24883043Sbrooks SLIST_INSERT_HEAD(&taphead, tp, tap_next); 24963670Snsayer 25083043Sbrooks unit = dev2unit(dev) & TAPMAXUNIT; 25183043Sbrooks 25263670Snsayer /* select device: tap or vmnet */ 25363670Snsayer if (minor(dev) & VMNET_DEV_MASK) { 25463670Snsayer name = VMNET; 25563803Snsayer tp->tap_flags |= TAP_VMNET; 25683043Sbrooks } else 25763670Snsayer name = TAP; 25863670Snsayer 25983043Sbrooks TAPDEBUG("tapcreate(%s%d). minor = %#x\n", name, unit, minor(dev)); 26083043Sbrooks 26183043Sbrooks if (!(dev->si_flags & SI_NAMED)) 262111742Sdes dev = make_dev(&tap_cdevsw, minor(dev), UID_ROOT, GID_WHEEL, 26363670Snsayer 0600, "%s%d", name, unit); 26463670Snsayer 26563670Snsayer /* generate fake MAC address: 00 bd xx xx xx unit_no */ 26663670Snsayer macaddr_hi = htons(0x00bd); 26763670Snsayer bcopy(&macaddr_hi, &tp->arpcom.ac_enaddr[0], sizeof(short)); 26863670Snsayer bcopy(&ticks, &tp->arpcom.ac_enaddr[2], sizeof(long)); 26963670Snsayer tp->arpcom.ac_enaddr[5] = (u_char)unit; 27063670Snsayer 271111742Sdes /* fill the rest and attach interface */ 27263670Snsayer ifp = &tp->tap_if; 27363670Snsayer ifp->if_softc = tp; 274121816Sbrooks if_initname(ifp, name, unit); 27563670Snsayer ifp->if_init = tapifinit; 27663670Snsayer ifp->if_start = tapifstart; 27763670Snsayer ifp->if_ioctl = tapifioctl; 27863670Snsayer ifp->if_mtu = ETHERMTU; 27963670Snsayer ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST); 28063670Snsayer ifp->if_snd.ifq_maxlen = ifqmaxlen; 28163670Snsayer 28283043Sbrooks dev->si_drv1 = tp; 283126077Sphk tp->tap_dev = dev; 28483043Sbrooks 28563803Snsayer s = splimp(); 286106939Ssam ether_ifattach(ifp, tp->arpcom.ac_enaddr); 28763803Snsayer splx(s); 28863670Snsayer 28963803Snsayer tp->tap_flags |= TAP_INITED; 29063803Snsayer 291121816Sbrooks TAPDEBUG("interface %s is created. minor = %#x\n", 292121816Sbrooks ifp->if_xname, minor(dev)); 29363670Snsayer} /* tapcreate */ 29463670Snsayer 29563670Snsayer 29663670Snsayer/* 297111742Sdes * tapopen 29863670Snsayer * 29963670Snsayer * to open tunnel. must be superuser 30063670Snsayer */ 30163670Snsayerstatic int 30283366Sjuliantapopen(dev, flag, mode, td) 30363670Snsayer dev_t dev; 30463670Snsayer int flag; 30563670Snsayer int mode; 30683366Sjulian struct thread *td; 30763670Snsayer{ 30863670Snsayer struct tap_softc *tp = NULL; 30983043Sbrooks int unit, error; 31063670Snsayer 31193593Sjhb if ((error = suser(td)) != 0) 31263670Snsayer return (error); 31363670Snsayer 31483043Sbrooks unit = dev2unit(dev) & TAPMAXUNIT; 31583043Sbrooks 31683043Sbrooks 31763670Snsayer tp = dev->si_drv1; 31863670Snsayer if (tp == NULL) { 31963670Snsayer tapcreate(dev); 32063670Snsayer tp = dev->si_drv1; 32163670Snsayer } 32263670Snsayer 323121816Sbrooks KASSERT(!(tp->tap_flags & TAP_OPEN), 324121816Sbrooks ("%s flags is out of sync", tp->tap_if.if_xname)); 32563670Snsayer 32663861Snsayer bcopy(tp->arpcom.ac_enaddr, tp->ether_addr, sizeof(tp->ether_addr)); 32763861Snsayer 32883366Sjulian tp->tap_pid = td->td_proc->p_pid; 32963670Snsayer tp->tap_flags |= TAP_OPEN; 33063670Snsayer 331121816Sbrooks TAPDEBUG("%s is open. minor = %#x\n", 332121816Sbrooks tp->tap_if.if_xname, minor(dev)); 33363670Snsayer 33463670Snsayer return (0); 33563670Snsayer} /* tapopen */ 33663670Snsayer 33763670Snsayer 33863670Snsayer/* 33963670Snsayer * tapclose 34063670Snsayer * 34163670Snsayer * close the device - mark i/f down & delete routing info 34263670Snsayer */ 34363670Snsayerstatic int 34483366Sjuliantapclose(dev, foo, bar, td) 34563670Snsayer dev_t dev; 34663670Snsayer int foo; 34763670Snsayer int bar; 34883366Sjulian struct thread *td; 34963670Snsayer{ 35063670Snsayer struct tap_softc *tp = dev->si_drv1; 35163670Snsayer struct ifnet *ifp = &tp->tap_if; 352126077Sphk int s; 35363670Snsayer 35463670Snsayer /* junk all pending output */ 35583043Sbrooks IF_DRAIN(&ifp->if_snd); 35663670Snsayer 35763803Snsayer /* 35863803Snsayer * do not bring the interface down, and do not anything with 35963803Snsayer * interface, if we are in VMnet mode. just close the device. 36063803Snsayer */ 36163803Snsayer 36263803Snsayer if (((tp->tap_flags & TAP_VMNET) == 0) && (ifp->if_flags & IFF_UP)) { 36363670Snsayer s = splimp(); 36463670Snsayer if_down(ifp); 36563670Snsayer if (ifp->if_flags & IFF_RUNNING) { 36663670Snsayer /* find internet addresses and delete routes */ 36763670Snsayer struct ifaddr *ifa = NULL; 36863670Snsayer 36963803Snsayer TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 37063670Snsayer if (ifa->ifa_addr->sa_family == AF_INET) { 37163670Snsayer rtinit(ifa, (int)RTM_DELETE, 0); 37263670Snsayer 37363670Snsayer /* remove address from interface */ 374111742Sdes bzero(ifa->ifa_addr, 37563670Snsayer sizeof(*(ifa->ifa_addr))); 376111742Sdes bzero(ifa->ifa_dstaddr, 37763670Snsayer sizeof(*(ifa->ifa_dstaddr))); 378111742Sdes bzero(ifa->ifa_netmask, 37963670Snsayer sizeof(*(ifa->ifa_netmask))); 38063670Snsayer } 38163670Snsayer } 38263670Snsayer 38363670Snsayer ifp->if_flags &= ~IFF_RUNNING; 38463670Snsayer } 38563670Snsayer splx(s); 38663670Snsayer } 38763670Snsayer 38896122Salfred funsetown(&tp->tap_sigio); 389122352Stanimura selwakeuppri(&tp->tap_rsel, PZERO+1); 39063670Snsayer 39163670Snsayer tp->tap_flags &= ~TAP_OPEN; 39263670Snsayer tp->tap_pid = 0; 39363670Snsayer 394121816Sbrooks TAPDEBUG("%s is closed. minor = %#x\n", 395121816Sbrooks ifp->if_xname, minor(dev)); 39663670Snsayer 39763670Snsayer return (0); 39863670Snsayer} /* tapclose */ 39963670Snsayer 40063670Snsayer 40163670Snsayer/* 40263670Snsayer * tapifinit 40363670Snsayer * 40463670Snsayer * network interface initialization function 40563670Snsayer */ 40663670Snsayerstatic void 40763670Snsayertapifinit(xtp) 40863670Snsayer void *xtp; 40963670Snsayer{ 41063670Snsayer struct tap_softc *tp = (struct tap_softc *)xtp; 41163670Snsayer struct ifnet *ifp = &tp->tap_if; 41263670Snsayer 413121816Sbrooks TAPDEBUG("initializing %s\n", ifp->if_xname); 41463670Snsayer 41563670Snsayer ifp->if_flags |= IFF_RUNNING; 41663670Snsayer ifp->if_flags &= ~IFF_OACTIVE; 41763670Snsayer 41863670Snsayer /* attempt to start output */ 41963670Snsayer tapifstart(ifp); 42063670Snsayer} /* tapifinit */ 42163670Snsayer 42263670Snsayer 42363670Snsayer/* 42463670Snsayer * tapifioctl 42563670Snsayer * 42663670Snsayer * Process an ioctl request on network interface 42763670Snsayer */ 428105228Sphkstatic int 42963670Snsayertapifioctl(ifp, cmd, data) 43063670Snsayer struct ifnet *ifp; 43163670Snsayer u_long cmd; 43263670Snsayer caddr_t data; 43363670Snsayer{ 434111742Sdes struct tap_softc *tp = (struct tap_softc *)(ifp->if_softc); 43563670Snsayer struct ifstat *ifs = NULL; 43663670Snsayer int s, dummy; 43763670Snsayer 43863670Snsayer switch (cmd) { 43963670Snsayer case SIOCSIFFLAGS: /* XXX -- just like vmnet does */ 44063670Snsayer case SIOCADDMULTI: 44163670Snsayer case SIOCDELMULTI: 44283043Sbrooks break; 44363670Snsayer 44463670Snsayer case SIOCGIFSTATUS: 44563670Snsayer s = splimp(); 44663670Snsayer ifs = (struct ifstat *)data; 44763670Snsayer dummy = strlen(ifs->ascii); 44863670Snsayer if (tp->tap_pid != 0 && dummy < sizeof(ifs->ascii)) 44963670Snsayer snprintf(ifs->ascii + dummy, 45063670Snsayer sizeof(ifs->ascii) - dummy, 45163670Snsayer "\tOpened by PID %d\n", tp->tap_pid); 45263670Snsayer splx(s); 45383043Sbrooks break; 45463670Snsayer 45563670Snsayer default: 456106939Ssam s = splimp(); 457106939Ssam dummy = ether_ioctl(ifp, cmd, data); 458106939Ssam splx(s); 459106939Ssam return (dummy); 46063670Snsayer } 46163670Snsayer 46263670Snsayer return (0); 46363670Snsayer} /* tapifioctl */ 46463670Snsayer 46563670Snsayer 46663670Snsayer/* 467111742Sdes * tapifstart 468111742Sdes * 46963670Snsayer * queue packets from higher level ready to put out 47063670Snsayer */ 47163670Snsayerstatic void 47263670Snsayertapifstart(ifp) 47363670Snsayer struct ifnet *ifp; 47463670Snsayer{ 47563670Snsayer struct tap_softc *tp = ifp->if_softc; 47663670Snsayer int s; 47763670Snsayer 478121816Sbrooks TAPDEBUG("%s starting\n", ifp->if_xname); 47963670Snsayer 48063803Snsayer /* 48163803Snsayer * do not junk pending output if we are in VMnet mode. 48263803Snsayer * XXX: can this do any harm because of queue overflow? 48363803Snsayer */ 48463803Snsayer 485111742Sdes if (((tp->tap_flags & TAP_VMNET) == 0) && 48663803Snsayer ((tp->tap_flags & TAP_READY) != TAP_READY)) { 48763670Snsayer struct mbuf *m = NULL; 48863670Snsayer 489121816Sbrooks TAPDEBUG("%s not ready, tap_flags = 0x%x\n", ifp->if_xname, 490121816Sbrooks tp->tap_flags); 49163670Snsayer 49263670Snsayer s = splimp(); 49363670Snsayer do { 49463670Snsayer IF_DEQUEUE(&ifp->if_snd, m); 49563670Snsayer if (m != NULL) 49663670Snsayer m_freem(m); 49763670Snsayer ifp->if_oerrors ++; 49863670Snsayer } while (m != NULL); 49963670Snsayer splx(s); 50063670Snsayer 50163670Snsayer return; 50263670Snsayer } 50363670Snsayer 50463670Snsayer s = splimp(); 50563670Snsayer ifp->if_flags |= IFF_OACTIVE; 50663670Snsayer 50763670Snsayer if (ifp->if_snd.ifq_len != 0) { 50863670Snsayer if (tp->tap_flags & TAP_RWAIT) { 50963670Snsayer tp->tap_flags &= ~TAP_RWAIT; 510111748Sdes wakeup(tp); 51163670Snsayer } 51263670Snsayer 51363670Snsayer if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) 51495883Salfred pgsigio(&tp->tap_sigio, SIGIO, 0); 51563670Snsayer 516122352Stanimura selwakeuppri(&tp->tap_rsel, PZERO+1); 51763670Snsayer ifp->if_opackets ++; /* obytes are counted in ether_output */ 51863670Snsayer } 51963670Snsayer 52063670Snsayer ifp->if_flags &= ~IFF_OACTIVE; 52163670Snsayer splx(s); 52263670Snsayer} /* tapifstart */ 52363670Snsayer 52463670Snsayer 52563670Snsayer/* 52663670Snsayer * tapioctl 52763670Snsayer * 52863670Snsayer * the cdevsw interface is now pretty minimal 52963670Snsayer */ 53063670Snsayerstatic int 53183366Sjuliantapioctl(dev, cmd, data, flag, td) 53263670Snsayer dev_t dev; 53363670Snsayer u_long cmd; 53463670Snsayer caddr_t data; 53563670Snsayer int flag; 53683366Sjulian struct thread *td; 53763670Snsayer{ 53863670Snsayer struct tap_softc *tp = dev->si_drv1; 53963670Snsayer struct ifnet *ifp = &tp->tap_if; 540111742Sdes struct tapinfo *tapp = NULL; 54163670Snsayer int s; 542102052Ssobomax int f; 54363670Snsayer 54463670Snsayer switch (cmd) { 545111742Sdes case TAPSIFINFO: 54663670Snsayer s = splimp(); 547111742Sdes tapp = (struct tapinfo *)data; 548111742Sdes ifp->if_mtu = tapp->mtu; 549111742Sdes ifp->if_type = tapp->type; 550111742Sdes ifp->if_baudrate = tapp->baudrate; 55163670Snsayer splx(s); 552111742Sdes break; 55363670Snsayer 554111742Sdes case TAPGIFINFO: 555111742Sdes tapp = (struct tapinfo *)data; 556111742Sdes tapp->mtu = ifp->if_mtu; 557111742Sdes tapp->type = ifp->if_type; 558111742Sdes tapp->baudrate = ifp->if_baudrate; 559111742Sdes break; 56063670Snsayer 56163670Snsayer case TAPSDEBUG: 56263670Snsayer tapdebug = *(int *)data; 56383043Sbrooks break; 56463670Snsayer 56563670Snsayer case TAPGDEBUG: 56663670Snsayer *(int *)data = tapdebug; 56783043Sbrooks break; 56863670Snsayer 56963670Snsayer case FIONBIO: 57083043Sbrooks break; 57163670Snsayer 57263670Snsayer case FIOASYNC: 57363803Snsayer s = splimp(); 57463670Snsayer if (*(int *)data) 57563670Snsayer tp->tap_flags |= TAP_ASYNC; 57663670Snsayer else 57763670Snsayer tp->tap_flags &= ~TAP_ASYNC; 57863803Snsayer splx(s); 57983043Sbrooks break; 58063670Snsayer 58163670Snsayer case FIONREAD: 58263670Snsayer s = splimp(); 58363670Snsayer if (ifp->if_snd.ifq_head) { 58463670Snsayer struct mbuf *mb = ifp->if_snd.ifq_head; 58563670Snsayer 58663803Snsayer for(*(int *)data = 0;mb != NULL;mb = mb->m_next) 58763670Snsayer *(int *)data += mb->m_len; 58883043Sbrooks } else 58963670Snsayer *(int *)data = 0; 59063670Snsayer splx(s); 59183043Sbrooks break; 59263670Snsayer 59363670Snsayer case FIOSETOWN: 59463670Snsayer return (fsetown(*(int *)data, &tp->tap_sigio)); 59563670Snsayer 59663670Snsayer case FIOGETOWN: 597104393Struckman *(int *)data = fgetown(&tp->tap_sigio); 59863670Snsayer return (0); 59963670Snsayer 60063670Snsayer /* this is deprecated, FIOSETOWN should be used instead */ 60163670Snsayer case TIOCSPGRP: 60263670Snsayer return (fsetown(-(*(int *)data), &tp->tap_sigio)); 60363670Snsayer 60463670Snsayer /* this is deprecated, FIOGETOWN should be used instead */ 60563670Snsayer case TIOCGPGRP: 606104393Struckman *(int *)data = -fgetown(&tp->tap_sigio); 60763670Snsayer return (0); 60863670Snsayer 60963670Snsayer /* VMware/VMnet port ioctl's */ 61063670Snsayer 61163670Snsayer case SIOCGIFFLAGS: /* get ifnet flags */ 61263670Snsayer bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags)); 61383043Sbrooks break; 61463670Snsayer 61583043Sbrooks case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 616102052Ssobomax f = *(int *)data; 61763670Snsayer f &= 0x0fff; 61863670Snsayer f &= ~IFF_CANTCHANGE; 61963670Snsayer f |= IFF_UP; 62063670Snsayer 62163670Snsayer s = splimp(); 62263670Snsayer ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE); 62363670Snsayer splx(s); 62483043Sbrooks break; 62563670Snsayer 62663861Snsayer case OSIOCGIFADDR: /* get MAC address of the remote side */ 62763670Snsayer case SIOCGIFADDR: 62863861Snsayer bcopy(tp->ether_addr, data, sizeof(tp->ether_addr)); 62983043Sbrooks break; 63063670Snsayer 63163861Snsayer case SIOCSIFADDR: /* set MAC address of the remote side */ 63263861Snsayer bcopy(data, tp->ether_addr, sizeof(tp->ether_addr)); 63383043Sbrooks break; 63463670Snsayer 63563670Snsayer default: 63663670Snsayer return (ENOTTY); 63763670Snsayer } 63863670Snsayer return (0); 63963670Snsayer} /* tapioctl */ 64063670Snsayer 64163670Snsayer 64263670Snsayer/* 64363670Snsayer * tapread 64463670Snsayer * 64563670Snsayer * the cdevsw read interface - reads a packet at a time, or at 64663670Snsayer * least as much of a packet as can be read 64763670Snsayer */ 64863670Snsayerstatic int 64963670Snsayertapread(dev, uio, flag) 65063670Snsayer dev_t dev; 65163670Snsayer struct uio *uio; 65263670Snsayer int flag; 65363670Snsayer{ 65463670Snsayer struct tap_softc *tp = dev->si_drv1; 65563670Snsayer struct ifnet *ifp = &tp->tap_if; 65690227Sdillon struct mbuf *m = NULL; 65763670Snsayer int error = 0, len, s; 65863670Snsayer 659121816Sbrooks TAPDEBUG("%s reading, minor = %#x\n", ifp->if_xname, minor(dev)); 66063670Snsayer 66163670Snsayer if ((tp->tap_flags & TAP_READY) != TAP_READY) { 662121816Sbrooks TAPDEBUG("%s not ready. minor = %#x, tap_flags = 0x%x\n", 663121816Sbrooks ifp->if_xname, minor(dev), tp->tap_flags); 66463803Snsayer 66563670Snsayer return (EHOSTDOWN); 66663670Snsayer } 66763670Snsayer 66863670Snsayer tp->tap_flags &= ~TAP_RWAIT; 66963670Snsayer 67063670Snsayer /* sleep until we get a packet */ 67163670Snsayer do { 67263670Snsayer s = splimp(); 67390227Sdillon IF_DEQUEUE(&ifp->if_snd, m); 67463670Snsayer splx(s); 67563670Snsayer 67690227Sdillon if (m == NULL) { 67763670Snsayer if (flag & IO_NDELAY) 67863670Snsayer return (EWOULDBLOCK); 679111742Sdes 68063670Snsayer tp->tap_flags |= TAP_RWAIT; 681111748Sdes error = tsleep(tp,PCATCH|(PZERO+1),"taprd",0); 68263670Snsayer if (error) 68363670Snsayer return (error); 68463670Snsayer } 68590227Sdillon } while (m == NULL); 68663670Snsayer 68763670Snsayer /* feed packet to bpf */ 688106939Ssam BPF_MTAP(ifp, m); 68963670Snsayer 69063670Snsayer /* xfer packet to user space */ 69190227Sdillon while ((m != NULL) && (uio->uio_resid > 0) && (error == 0)) { 69290227Sdillon len = min(uio->uio_resid, m->m_len); 69363670Snsayer if (len == 0) 69463670Snsayer break; 69563670Snsayer 696111741Sdes error = uiomove(mtod(m, void *), len, uio); 69790227Sdillon m = m_free(m); 69863670Snsayer } 69963670Snsayer 70090227Sdillon if (m != NULL) { 701121816Sbrooks TAPDEBUG("%s dropping mbuf, minor = %#x\n", ifp->if_xname, 702121816Sbrooks minor(dev)); 70390227Sdillon m_freem(m); 70463670Snsayer } 70563670Snsayer 70663670Snsayer return (error); 70763670Snsayer} /* tapread */ 70863670Snsayer 70963670Snsayer 71063670Snsayer/* 71163670Snsayer * tapwrite 71263670Snsayer * 71363670Snsayer * the cdevsw write interface - an atomic write is a packet - or else! 71463670Snsayer */ 71563670Snsayerstatic int 71663670Snsayertapwrite(dev, uio, flag) 71763670Snsayer dev_t dev; 71863670Snsayer struct uio *uio; 71963670Snsayer int flag; 72063670Snsayer{ 72163670Snsayer struct tap_softc *tp = dev->si_drv1; 72263670Snsayer struct ifnet *ifp = &tp->tap_if; 72363670Snsayer struct mbuf *top = NULL, **mp = NULL, *m = NULL; 724111742Sdes int error = 0, tlen, mlen; 72563670Snsayer 726121816Sbrooks TAPDEBUG("%s writting, minor = %#x\n", 727121816Sbrooks ifp->if_xname, minor(dev)); 72863670Snsayer 72963670Snsayer if (uio->uio_resid == 0) 73063670Snsayer return (0); 73163670Snsayer 73263670Snsayer if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) { 733121816Sbrooks TAPDEBUG("%s invalid packet len = %d, minor = %#x\n", 734121816Sbrooks ifp->if_xname, uio->uio_resid, minor(dev)); 73563803Snsayer 73663670Snsayer return (EIO); 73763670Snsayer } 73863670Snsayer tlen = uio->uio_resid; 73963670Snsayer 74063670Snsayer /* get a header mbuf */ 741111119Simp MGETHDR(m, M_DONTWAIT, MT_DATA); 74263670Snsayer if (m == NULL) 74363670Snsayer return (ENOBUFS); 74463670Snsayer mlen = MHLEN; 74563670Snsayer 74663670Snsayer top = 0; 74763670Snsayer mp = ⊤ 74863670Snsayer while ((error == 0) && (uio->uio_resid > 0)) { 74963670Snsayer m->m_len = min(mlen, uio->uio_resid); 750111741Sdes error = uiomove(mtod(m, void *), m->m_len, uio); 75163670Snsayer *mp = m; 75263670Snsayer mp = &m->m_next; 75363670Snsayer if (uio->uio_resid > 0) { 754111119Simp MGET(m, M_DONTWAIT, MT_DATA); 75563803Snsayer if (m == NULL) { 75663670Snsayer error = ENOBUFS; 75763670Snsayer break; 75863670Snsayer } 75963670Snsayer mlen = MLEN; 76063670Snsayer } 76163670Snsayer } 76263670Snsayer if (error) { 76363670Snsayer ifp->if_ierrors ++; 76463670Snsayer if (top) 76563670Snsayer m_freem(top); 76663670Snsayer return (error); 76763670Snsayer } 76863670Snsayer 76963670Snsayer top->m_pkthdr.len = tlen; 77063670Snsayer top->m_pkthdr.rcvif = ifp; 771111742Sdes 772106939Ssam /* Pass packet up to parent. */ 773106939Ssam (*ifp->if_input)(ifp, top); 774106939Ssam ifp->if_ipackets ++; /* ibytes are counted in parent */ 77563670Snsayer 77663670Snsayer return (0); 77763670Snsayer} /* tapwrite */ 77863670Snsayer 77963670Snsayer 78063670Snsayer/* 78163670Snsayer * tappoll 78263670Snsayer * 78363670Snsayer * the poll interface, this is only useful on reads 78463670Snsayer * really. the write detect always returns true, write never blocks 78563670Snsayer * anyway, it either accepts the packet or drops it 78663670Snsayer */ 78763670Snsayerstatic int 78883366Sjuliantappoll(dev, events, td) 78963670Snsayer dev_t dev; 79063670Snsayer int events; 79183366Sjulian struct thread *td; 79263670Snsayer{ 79363670Snsayer struct tap_softc *tp = dev->si_drv1; 79463670Snsayer struct ifnet *ifp = &tp->tap_if; 795111742Sdes int s, revents = 0; 79663670Snsayer 797121816Sbrooks TAPDEBUG("%s polling, minor = %#x\n", 798121816Sbrooks ifp->if_xname, minor(dev)); 79963670Snsayer 80063670Snsayer s = splimp(); 80163670Snsayer if (events & (POLLIN | POLLRDNORM)) { 80263670Snsayer if (ifp->if_snd.ifq_len > 0) { 803121816Sbrooks TAPDEBUG("%s have data in queue. len = %d, " \ 804121816Sbrooks "minor = %#x\n", ifp->if_xname, 80583043Sbrooks ifp->if_snd.ifq_len, minor(dev)); 80663803Snsayer 80763670Snsayer revents |= (events & (POLLIN | POLLRDNORM)); 80883043Sbrooks } else { 809121816Sbrooks TAPDEBUG("%s waiting for data, minor = %#x\n", 810121816Sbrooks ifp->if_xname, minor(dev)); 81163803Snsayer 81283805Sjhb selrecord(td, &tp->tap_rsel); 81363670Snsayer } 81463670Snsayer } 81563670Snsayer 81663670Snsayer if (events & (POLLOUT | POLLWRNORM)) 81763670Snsayer revents |= (events & (POLLOUT | POLLWRNORM)); 81863670Snsayer 81963670Snsayer splx(s); 82063670Snsayer return (revents); 82163670Snsayer} /* tappoll */ 822