if_tap.c revision 205222
1139823Simp/*- 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 205222 2010-03-16 17:59:12Z qingli $ 3563803Snsayer * $Id: if_tap.c,v 0.21 2000/07/23 21:46:02 max Exp $ 3663670Snsayer */ 3763670Snsayer 38162711Sru#include "opt_compat.h" 3963670Snsayer#include "opt_inet.h" 4063670Snsayer 4163670Snsayer#include <sys/param.h> 4263670Snsayer#include <sys/conf.h> 43139207Sphk#include <sys/fcntl.h> 4463670Snsayer#include <sys/filio.h> 4563670Snsayer#include <sys/kernel.h> 4663670Snsayer#include <sys/malloc.h> 4763670Snsayer#include <sys/mbuf.h> 48129880Sphk#include <sys/module.h> 4963670Snsayer#include <sys/poll.h> 50164033Srwatson#include <sys/priv.h> 5163670Snsayer#include <sys/proc.h> 52139207Sphk#include <sys/selinfo.h> 5363670Snsayer#include <sys/signalvar.h> 5463670Snsayer#include <sys/socket.h> 5563670Snsayer#include <sys/sockio.h> 5663670Snsayer#include <sys/sysctl.h> 5763670Snsayer#include <sys/systm.h> 5863670Snsayer#include <sys/ttycom.h> 5963670Snsayer#include <sys/uio.h> 6083043Sbrooks#include <sys/queue.h> 6163670Snsayer 6263670Snsayer#include <net/bpf.h> 6363670Snsayer#include <net/ethernet.h> 6463670Snsayer#include <net/if.h> 65166497Sbms#include <net/if_clone.h> 66152315Sru#include <net/if_dl.h> 6763670Snsayer#include <net/route.h> 68147256Sbrooks#include <net/if_types.h> 6963670Snsayer 7063670Snsayer#include <netinet/in.h> 7163670Snsayer 7263670Snsayer#include <net/if_tapvar.h> 7363670Snsayer#include <net/if_tap.h> 7463670Snsayer 7563670Snsayer 7663670Snsayer#define CDEV_NAME "tap" 7763670Snsayer#define TAPDEBUG if (tapdebug) printf 7863670Snsayer 7963670Snsayer#define TAP "tap" 8063670Snsayer#define VMNET "vmnet" 8183043Sbrooks#define TAPMAXUNIT 0x7fff 82126077Sphk#define VMNET_DEV_MASK CLONE_FLAG0 8363670Snsayer 8463670Snsayer/* module */ 85111742Sdesstatic int tapmodevent(module_t, int, void *); 8663670Snsayer 8763670Snsayer/* device */ 88148868Srwatsonstatic void tapclone(void *, struct ucred *, char *, int, 89148868Srwatson struct cdev **); 90130585Sphkstatic void tapcreate(struct cdev *); 9163670Snsayer 9263670Snsayer/* network interface */ 9393084Sbdestatic void tapifstart(struct ifnet *); 9493084Sbdestatic int tapifioctl(struct ifnet *, u_long, caddr_t); 9593084Sbdestatic void tapifinit(void *); 9663670Snsayer 97166497Sbmsstatic int tap_clone_create(struct if_clone *, int, caddr_t); 98166497Sbmsstatic void tap_clone_destroy(struct ifnet *); 99166497Sbmsstatic int vmnet_clone_create(struct if_clone *, int, caddr_t); 100166497Sbmsstatic void vmnet_clone_destroy(struct ifnet *); 101166497Sbms 102166497SbmsIFC_SIMPLE_DECLARE(tap, 0); 103166497SbmsIFC_SIMPLE_DECLARE(vmnet, 0); 104166497Sbms 10563670Snsayer/* character device */ 10663670Snsayerstatic d_open_t tapopen; 10763670Snsayerstatic d_close_t tapclose; 10863670Snsayerstatic d_read_t tapread; 10963670Snsayerstatic d_write_t tapwrite; 11063670Snsayerstatic d_ioctl_t tapioctl; 11163670Snsayerstatic d_poll_t tappoll; 112156783Semaxstatic d_kqfilter_t tapkqfilter; 11363670Snsayer 114156783Semax/* kqueue(2) */ 115156783Semaxstatic int tapkqread(struct knote *, long); 116156783Semaxstatic int tapkqwrite(struct knote *, long); 117156783Semaxstatic void tapkqdetach(struct knote *); 118156783Semax 119156783Semaxstatic struct filterops tap_read_filterops = { 120156783Semax .f_isfd = 1, 121156783Semax .f_attach = NULL, 122156783Semax .f_detach = tapkqdetach, 123156783Semax .f_event = tapkqread, 124156783Semax}; 125156783Semax 126156783Semaxstatic struct filterops tap_write_filterops = { 127156783Semax .f_isfd = 1, 128156783Semax .f_attach = NULL, 129156783Semax .f_detach = tapkqdetach, 130156783Semax .f_event = tapkqwrite, 131156783Semax}; 132156783Semax 13363670Snsayerstatic struct cdevsw tap_cdevsw = { 134126080Sphk .d_version = D_VERSION, 135179726Sed .d_flags = D_PSEUDO | D_NEEDGIANT | D_NEEDMINOR, 136111815Sphk .d_open = tapopen, 137111815Sphk .d_close = tapclose, 138111815Sphk .d_read = tapread, 139111815Sphk .d_write = tapwrite, 140111815Sphk .d_ioctl = tapioctl, 141111815Sphk .d_poll = tappoll, 142111815Sphk .d_name = CDEV_NAME, 143156783Semax .d_kqfilter = tapkqfilter, 14463670Snsayer}; 14563670Snsayer 146127003Srwatson/* 147127003Srwatson * All global variables in if_tap.c are locked with tapmtx, with the 148127003Srwatson * exception of tapdebug, which is accessed unlocked; tapclones is 149127003Srwatson * static at runtime. 150127003Srwatson */ 151127003Srwatsonstatic struct mtx tapmtx; 15283043Sbrooksstatic int tapdebug = 0; /* debug flag */ 153167713Sbmsstatic int tapuopen = 0; /* allow user open() */ 154167713Sbmsstatic int tapuponopen = 0; /* IFF_UP on open() */ 155166497Sbmsstatic int tapdclone = 1; /* enable devfs cloning */ 15683043Sbrooksstatic SLIST_HEAD(, tap_softc) taphead; /* first device */ 157126077Sphkstatic struct clonedevs *tapclones; 15863670Snsayer 15963670SnsayerMALLOC_DECLARE(M_TAP); 16063670SnsayerMALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface"); 16163670SnsayerSYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, ""); 162144979Smdodd 163144979SmdoddSYSCTL_DECL(_net_link); 164144979SmdoddSYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0, 165144979Smdodd "Ethernet tunnel software network interface"); 166144979SmdoddSYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0, 167144979Smdodd "Allow user to open /dev/tap (based on node permissions)"); 168167713SbmsSYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0, 169167713Sbms "Bring interface up when /dev/tap is opened"); 170166497SbmsSYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RW, &tapdclone, 0, 171166497Sbms "Enably legacy devfs interface creation"); 172144979SmdoddSYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, ""); 173144979Smdodd 174166497SbmsTUNABLE_INT("net.link.tap.devfs_cloning", &tapdclone); 175166497Sbms 17663670SnsayerDEV_MODULE(if_tap, tapmodevent, NULL); 17763670Snsayer 178166497Sbmsstatic int 179166497Sbmstap_clone_create(struct if_clone *ifc, int unit, caddr_t params) 180166497Sbms{ 181166497Sbms struct cdev *dev; 182166497Sbms int i; 183166497Sbms int extra; 184166497Sbms 185166497Sbms if (strcmp(ifc->ifc_name, VMNET) == 0) 186166497Sbms extra = VMNET_DEV_MASK; 187166497Sbms else 188166497Sbms extra = 0; 189166497Sbms 190166497Sbms /* find any existing device, or allocate new unit number */ 191166497Sbms i = clone_create(&tapclones, &tap_cdevsw, &unit, &dev, extra); 192166497Sbms if (i) { 193183381Sed dev = make_dev(&tap_cdevsw, unit | extra, 194166497Sbms UID_ROOT, GID_WHEEL, 0600, "%s%d", ifc->ifc_name, unit); 195166497Sbms } 196166497Sbms 197166497Sbms tapcreate(dev); 198166497Sbms return (0); 199166497Sbms} 200166497Sbms 201166497Sbms/* vmnet devices are tap devices in disguise */ 202166497Sbmsstatic int 203166497Sbmsvmnet_clone_create(struct if_clone *ifc, int unit, caddr_t params) 204166497Sbms{ 205166497Sbms return tap_clone_create(ifc, unit, params); 206166497Sbms} 207166497Sbms 208166497Sbmsstatic void 209166497Sbmstap_destroy(struct tap_softc *tp) 210166497Sbms{ 211166497Sbms struct ifnet *ifp = tp->tap_ifp; 212166497Sbms int s; 213166497Sbms 214166497Sbms /* Unlocked read. */ 215166497Sbms KASSERT(!(tp->tap_flags & TAP_OPEN), 216166497Sbms ("%s flags is out of sync", ifp->if_xname)); 217166497Sbms 218166497Sbms knlist_destroy(&tp->tap_rsel.si_note); 219166497Sbms destroy_dev(tp->tap_dev); 220166497Sbms s = splimp(); 221166497Sbms ether_ifdetach(ifp); 222166497Sbms if_free_type(ifp, IFT_ETHER); 223166497Sbms splx(s); 224166497Sbms 225166497Sbms mtx_destroy(&tp->tap_mtx); 226166497Sbms free(tp, M_TAP); 227166497Sbms} 228166497Sbms 229166497Sbmsstatic void 230166497Sbmstap_clone_destroy(struct ifnet *ifp) 231166497Sbms{ 232166497Sbms struct tap_softc *tp = ifp->if_softc; 233166497Sbms 234166497Sbms mtx_lock(&tapmtx); 235166497Sbms SLIST_REMOVE(&taphead, tp, tap_softc, tap_next); 236166497Sbms mtx_unlock(&tapmtx); 237166497Sbms tap_destroy(tp); 238166497Sbms} 239166497Sbms 240166497Sbms/* vmnet devices are tap devices in disguise */ 241166497Sbmsstatic void 242166497Sbmsvmnet_clone_destroy(struct ifnet *ifp) 243166497Sbms{ 244166497Sbms tap_clone_destroy(ifp); 245166497Sbms} 246166497Sbms 24763670Snsayer/* 24863670Snsayer * tapmodevent 24963670Snsayer * 25063670Snsayer * module event handler 25163670Snsayer */ 25263670Snsayerstatic int 253156783Semaxtapmodevent(module_t mod, int type, void *data) 25463670Snsayer{ 25583043Sbrooks static eventhandler_tag eh_tag = NULL; 25683043Sbrooks struct tap_softc *tp = NULL; 25783043Sbrooks struct ifnet *ifp = NULL; 25863670Snsayer 25963670Snsayer switch (type) { 26063670Snsayer case MOD_LOAD: 26163670Snsayer 26283043Sbrooks /* intitialize device */ 26383043Sbrooks 264127003Srwatson mtx_init(&tapmtx, "tapmtx", NULL, MTX_DEF); 26583043Sbrooks SLIST_INIT(&taphead); 26683043Sbrooks 267126845Sphk clone_setup(&tapclones); 26871602Sphk eh_tag = EVENTHANDLER_REGISTER(dev_clone, tapclone, 0, 1000); 269127003Srwatson if (eh_tag == NULL) { 270127170Srwatson clone_cleanup(&tapclones); 271127003Srwatson mtx_destroy(&tapmtx); 272126077Sphk return (ENOMEM); 273127003Srwatson } 274166497Sbms if_clone_attach(&tap_cloner); 275166497Sbms if_clone_attach(&vmnet_cloner); 27683043Sbrooks return (0); 27763670Snsayer 27883043Sbrooks case MOD_UNLOAD: 279127003Srwatson /* 280127003Srwatson * The EBUSY algorithm here can't quite atomically 281127003Srwatson * guarantee that this is race-free since we have to 282127003Srwatson * release the tap mtx to deregister the clone handler. 283127003Srwatson */ 284127003Srwatson mtx_lock(&tapmtx); 285127003Srwatson SLIST_FOREACH(tp, &taphead, tap_next) { 286127098Srwatson mtx_lock(&tp->tap_mtx); 287127003Srwatson if (tp->tap_flags & TAP_OPEN) { 288127098Srwatson mtx_unlock(&tp->tap_mtx); 289127003Srwatson mtx_unlock(&tapmtx); 29083043Sbrooks return (EBUSY); 291127003Srwatson } 292127098Srwatson mtx_unlock(&tp->tap_mtx); 293127003Srwatson } 294127003Srwatson mtx_unlock(&tapmtx); 29583043Sbrooks 29671602Sphk EVENTHANDLER_DEREGISTER(dev_clone, eh_tag); 297166497Sbms if_clone_detach(&tap_cloner); 298166497Sbms if_clone_detach(&vmnet_cloner); 299204464Skib drain_dev_clone_events(); 30063670Snsayer 301127003Srwatson mtx_lock(&tapmtx); 30283043Sbrooks while ((tp = SLIST_FIRST(&taphead)) != NULL) { 30383043Sbrooks SLIST_REMOVE_HEAD(&taphead, tap_next); 304127003Srwatson mtx_unlock(&tapmtx); 30583043Sbrooks 306147256Sbrooks ifp = tp->tap_ifp; 30783043Sbrooks 308121816Sbrooks TAPDEBUG("detaching %s\n", ifp->if_xname); 30983043Sbrooks 310166497Sbms tap_destroy(tp); 311127003Srwatson mtx_lock(&tapmtx); 31283043Sbrooks } 313127003Srwatson mtx_unlock(&tapmtx); 314126077Sphk clone_cleanup(&tapclones); 31563670Snsayer 316135354Srwatson mtx_destroy(&tapmtx); 317135354Srwatson 31883043Sbrooks break; 31963670Snsayer 32063670Snsayer default: 32163670Snsayer return (EOPNOTSUPP); 32263670Snsayer } 32363670Snsayer 32463670Snsayer return (0); 32563670Snsayer} /* tapmodevent */ 32663670Snsayer 32763670Snsayer 32863670Snsayer/* 32971602Sphk * DEVFS handler 33071602Sphk * 33171602Sphk * We need to support two kind of devices - tap and vmnet 33271602Sphk */ 33371602Sphkstatic void 334156783Semaxtapclone(void *arg, struct ucred *cred, char *name, int namelen, struct cdev **dev) 33571602Sphk{ 336166497Sbms char devname[SPECNAMELEN + 1]; 337166497Sbms int i, unit, append_unit; 338166438Sbms int extra; 33971602Sphk 340130640Sphk if (*dev != NULL) 34171602Sphk return; 34271602Sphk 343166514Sbms if (!tapdclone || 344166514Sbms (!tapuopen && priv_check_cred(cred, PRIV_NET_IFCREATE, 0) != 0)) 345166497Sbms return; 346166497Sbms 347166497Sbms unit = 0; 348166497Sbms append_unit = 0; 349126077Sphk extra = 0; 350166497Sbms 351166497Sbms /* We're interested in only tap/vmnet devices. */ 352126077Sphk if (strcmp(name, TAP) == 0) { 353126077Sphk unit = -1; 354126077Sphk } else if (strcmp(name, VMNET) == 0) { 355126077Sphk unit = -1; 356126077Sphk extra = VMNET_DEV_MASK; 357166497Sbms } else if (dev_stdclone(name, NULL, TAP, &unit) != 1) { 358166497Sbms if (dev_stdclone(name, NULL, VMNET, &unit) != 1) { 359126077Sphk return; 360166497Sbms } else { 361166497Sbms extra = VMNET_DEV_MASK; 362166497Sbms } 36383043Sbrooks } 36471602Sphk 365166497Sbms if (unit == -1) 366166497Sbms append_unit = 1; 367166497Sbms 368126077Sphk /* find any existing device, or allocate new unit number */ 369126077Sphk i = clone_create(&tapclones, &tap_cdevsw, &unit, dev, extra); 370126077Sphk if (i) { 371166497Sbms if (append_unit) { 372166497Sbms /* 373166497Sbms * We were passed 'tun' or 'tap', with no unit specified 374166497Sbms * so we'll need to append it now. 375166497Sbms */ 376166497Sbms namelen = snprintf(devname, sizeof(devname), "%s%d", name, 377166497Sbms unit); 378166497Sbms name = devname; 379166497Sbms } 380166497Sbms 381204464Skib *dev = make_dev_credf(MAKEDEV_REF, &tap_cdevsw, unit | extra, 382204464Skib cred, UID_ROOT, GID_WHEEL, 0600, "%s", name); 38371602Sphk } 384166497Sbms 385166497Sbms if_clone_create(name, namelen, NULL); 38671602Sphk} /* tapclone */ 38771602Sphk 38871602Sphk 38971602Sphk/* 39063670Snsayer * tapcreate 39163670Snsayer * 39263670Snsayer * to create interface 39363670Snsayer */ 39463670Snsayerstatic void 395156783Semaxtapcreate(struct cdev *dev) 39663670Snsayer{ 39763670Snsayer struct ifnet *ifp = NULL; 39863670Snsayer struct tap_softc *tp = NULL; 39963670Snsayer unsigned short macaddr_hi; 400178221Semax uint32_t macaddr_mid; 40163803Snsayer int unit, s; 40263670Snsayer char *name = NULL; 403147256Sbrooks u_char eaddr[6]; 40463670Snsayer 405126077Sphk dev->si_flags &= ~SI_CHEAPCLONE; 406126077Sphk 40763670Snsayer /* allocate driver storage and create device */ 408184205Sdes tp = malloc(sizeof(*tp), M_TAP, M_WAITOK | M_ZERO); 409127098Srwatson mtx_init(&tp->tap_mtx, "tap_mtx", NULL, MTX_DEF); 410127003Srwatson mtx_lock(&tapmtx); 41183043Sbrooks SLIST_INSERT_HEAD(&taphead, tp, tap_next); 412127003Srwatson mtx_unlock(&tapmtx); 41363670Snsayer 414126796Sphk unit = dev2unit(dev); 41583043Sbrooks 41663670Snsayer /* select device: tap or vmnet */ 417126796Sphk if (unit & VMNET_DEV_MASK) { 41863670Snsayer name = VMNET; 41963803Snsayer tp->tap_flags |= TAP_VMNET; 42083043Sbrooks } else 42163670Snsayer name = TAP; 42263670Snsayer 423126796Sphk unit &= TAPMAXUNIT; 424126796Sphk 425183397Sed TAPDEBUG("tapcreate(%s%d). minor = %#x\n", name, unit, dev2unit(dev)); 42683043Sbrooks 42763670Snsayer /* generate fake MAC address: 00 bd xx xx xx unit_no */ 42863670Snsayer macaddr_hi = htons(0x00bd); 429178221Semax macaddr_mid = (uint32_t) ticks; 430147256Sbrooks bcopy(&macaddr_hi, eaddr, sizeof(short)); 431178221Semax bcopy(&macaddr_mid, &eaddr[2], sizeof(uint32_t)); 432147256Sbrooks eaddr[5] = (u_char)unit; 43363670Snsayer 434111742Sdes /* fill the rest and attach interface */ 435147256Sbrooks ifp = tp->tap_ifp = if_alloc(IFT_ETHER); 436147256Sbrooks if (ifp == NULL) 437147256Sbrooks panic("%s%d: can not if_alloc()", name, unit); 43863670Snsayer ifp->if_softc = tp; 439121816Sbrooks if_initname(ifp, name, unit); 44063670Snsayer ifp->if_init = tapifinit; 44163670Snsayer ifp->if_start = tapifstart; 44263670Snsayer ifp->if_ioctl = tapifioctl; 44363670Snsayer ifp->if_mtu = ETHERMTU; 44463670Snsayer ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST); 44563670Snsayer ifp->if_snd.ifq_maxlen = ifqmaxlen; 446205222Sqingli ifp->if_capabilities |= IFCAP_LINKSTATE; 447205222Sqingli ifp->if_capenable |= IFCAP_LINKSTATE; 44863670Snsayer 44983043Sbrooks dev->si_drv1 = tp; 450126077Sphk tp->tap_dev = dev; 45183043Sbrooks 45263803Snsayer s = splimp(); 453147256Sbrooks ether_ifattach(ifp, eaddr); 45463803Snsayer splx(s); 45563670Snsayer 456127098Srwatson mtx_lock(&tp->tap_mtx); 45763803Snsayer tp->tap_flags |= TAP_INITED; 458127098Srwatson mtx_unlock(&tp->tap_mtx); 45963803Snsayer 460193951Skib knlist_init_mtx(&tp->tap_rsel.si_note, NULL); 461158697Semax 462121816Sbrooks TAPDEBUG("interface %s is created. minor = %#x\n", 463183397Sed ifp->if_xname, dev2unit(dev)); 46463670Snsayer} /* tapcreate */ 46563670Snsayer 46663670Snsayer 46763670Snsayer/* 468111742Sdes * tapopen 46963670Snsayer * 47063670Snsayer * to open tunnel. must be superuser 47163670Snsayer */ 47263670Snsayerstatic int 473156783Semaxtapopen(struct cdev *dev, int flag, int mode, struct thread *td) 47463670Snsayer{ 47563670Snsayer struct tap_softc *tp = NULL; 476133460Semax struct ifnet *ifp = NULL; 477164033Srwatson int error, s; 47863670Snsayer 479164033Srwatson if (tapuopen == 0) { 480164033Srwatson error = priv_check(td, PRIV_NET_TAP); 481164033Srwatson if (error) 482164033Srwatson return (error); 483164033Srwatson } 48463670Snsayer 485126796Sphk if ((dev2unit(dev) & CLONE_UNITMASK) > TAPMAXUNIT) 486126796Sphk return (ENXIO); 48783043Sbrooks 48863670Snsayer tp = dev->si_drv1; 48963670Snsayer 490127165Srwatson mtx_lock(&tp->tap_mtx); 491127165Srwatson if (tp->tap_flags & TAP_OPEN) { 492127165Srwatson mtx_unlock(&tp->tap_mtx); 493127165Srwatson return (EBUSY); 494127165Srwatson } 49563670Snsayer 496152315Sru bcopy(IF_LLADDR(tp->tap_ifp), tp->ether_addr, sizeof(tp->ether_addr)); 49783366Sjulian tp->tap_pid = td->td_proc->p_pid; 49863670Snsayer tp->tap_flags |= TAP_OPEN; 499147256Sbrooks ifp = tp->tap_ifp; 500127098Srwatson mtx_unlock(&tp->tap_mtx); 50163670Snsayer 502133460Semax s = splimp(); 503148887Srwatson ifp->if_drv_flags |= IFF_DRV_RUNNING; 504148887Srwatson ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 505167713Sbms if (tapuponopen) 506167713Sbms ifp->if_flags |= IFF_UP; 507205024Sqingli if_link_state_change(ifp, LINK_STATE_UP); 508133460Semax splx(s); 50963670Snsayer 510183397Sed TAPDEBUG("%s is open. minor = %#x\n", ifp->if_xname, dev2unit(dev)); 511133460Semax 51263670Snsayer return (0); 51363670Snsayer} /* tapopen */ 51463670Snsayer 51563670Snsayer 51663670Snsayer/* 51763670Snsayer * tapclose 51863670Snsayer * 51963670Snsayer * close the device - mark i/f down & delete routing info 52063670Snsayer */ 52163670Snsayerstatic int 522156783Semaxtapclose(struct cdev *dev, int foo, int bar, struct thread *td) 52363670Snsayer{ 524156783Semax struct ifaddr *ifa; 52563670Snsayer struct tap_softc *tp = dev->si_drv1; 526147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 527126077Sphk int s; 52863670Snsayer 52963670Snsayer /* junk all pending output */ 53083043Sbrooks IF_DRAIN(&ifp->if_snd); 53163670Snsayer 53263803Snsayer /* 53363803Snsayer * do not bring the interface down, and do not anything with 53463803Snsayer * interface, if we are in VMnet mode. just close the device. 53563803Snsayer */ 53663803Snsayer 537127098Srwatson mtx_lock(&tp->tap_mtx); 53863803Snsayer if (((tp->tap_flags & TAP_VMNET) == 0) && (ifp->if_flags & IFF_UP)) { 539127098Srwatson mtx_unlock(&tp->tap_mtx); 54063670Snsayer s = splimp(); 54163670Snsayer if_down(ifp); 542148887Srwatson if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 54363803Snsayer TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 544146620Speadar rtinit(ifa, (int)RTM_DELETE, 0); 54563670Snsayer } 546146620Speadar if_purgeaddrs(ifp); 547148887Srwatson ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 54863670Snsayer } 54963670Snsayer splx(s); 550127098Srwatson } else 551127098Srwatson mtx_unlock(&tp->tap_mtx); 55263670Snsayer 553205024Sqingli if_link_state_change(ifp, LINK_STATE_DOWN); 55496122Salfred funsetown(&tp->tap_sigio); 555122352Stanimura selwakeuppri(&tp->tap_rsel, PZERO+1); 556156783Semax KNOTE_UNLOCKED(&tp->tap_rsel.si_note, 0); 55763670Snsayer 558127098Srwatson mtx_lock(&tp->tap_mtx); 55963670Snsayer tp->tap_flags &= ~TAP_OPEN; 56063670Snsayer tp->tap_pid = 0; 561127098Srwatson mtx_unlock(&tp->tap_mtx); 56263670Snsayer 563121816Sbrooks TAPDEBUG("%s is closed. minor = %#x\n", 564183397Sed ifp->if_xname, dev2unit(dev)); 56563670Snsayer 56663670Snsayer return (0); 56763670Snsayer} /* tapclose */ 56863670Snsayer 56963670Snsayer 57063670Snsayer/* 57163670Snsayer * tapifinit 57263670Snsayer * 57363670Snsayer * network interface initialization function 57463670Snsayer */ 57563670Snsayerstatic void 576156783Semaxtapifinit(void *xtp) 57763670Snsayer{ 57863670Snsayer struct tap_softc *tp = (struct tap_softc *)xtp; 579147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 58063670Snsayer 581121816Sbrooks TAPDEBUG("initializing %s\n", ifp->if_xname); 58263670Snsayer 583148887Srwatson ifp->if_drv_flags |= IFF_DRV_RUNNING; 584148887Srwatson ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 58563670Snsayer 58663670Snsayer /* attempt to start output */ 58763670Snsayer tapifstart(ifp); 58863670Snsayer} /* tapifinit */ 58963670Snsayer 59063670Snsayer 59163670Snsayer/* 59263670Snsayer * tapifioctl 59363670Snsayer * 59463670Snsayer * Process an ioctl request on network interface 59563670Snsayer */ 596105228Sphkstatic int 597156783Semaxtapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 59863670Snsayer{ 599160376Sbrooks struct tap_softc *tp = ifp->if_softc; 600189866Sscf struct ifreq *ifr = (struct ifreq *)data; 60163670Snsayer struct ifstat *ifs = NULL; 60263670Snsayer int s, dummy; 60363670Snsayer 60463670Snsayer switch (cmd) { 60563670Snsayer case SIOCSIFFLAGS: /* XXX -- just like vmnet does */ 60663670Snsayer case SIOCADDMULTI: 60763670Snsayer case SIOCDELMULTI: 60883043Sbrooks break; 60963670Snsayer 610189866Sscf case SIOCSIFMTU: 611189866Sscf ifp->if_mtu = ifr->ifr_mtu; 612189866Sscf break; 613189866Sscf 61463670Snsayer case SIOCGIFSTATUS: 61563670Snsayer s = splimp(); 61663670Snsayer ifs = (struct ifstat *)data; 61763670Snsayer dummy = strlen(ifs->ascii); 618127098Srwatson mtx_lock(&tp->tap_mtx); 61963670Snsayer if (tp->tap_pid != 0 && dummy < sizeof(ifs->ascii)) 62063670Snsayer snprintf(ifs->ascii + dummy, 62163670Snsayer sizeof(ifs->ascii) - dummy, 62263670Snsayer "\tOpened by PID %d\n", tp->tap_pid); 623127098Srwatson mtx_unlock(&tp->tap_mtx); 62463670Snsayer splx(s); 62583043Sbrooks break; 62663670Snsayer 62763670Snsayer default: 628106939Ssam s = splimp(); 629106939Ssam dummy = ether_ioctl(ifp, cmd, data); 630106939Ssam splx(s); 631106939Ssam return (dummy); 632156783Semax /* NOT REACHED */ 63363670Snsayer } 63463670Snsayer 63563670Snsayer return (0); 63663670Snsayer} /* tapifioctl */ 63763670Snsayer 63863670Snsayer 63963670Snsayer/* 640111742Sdes * tapifstart 641111742Sdes * 64263670Snsayer * queue packets from higher level ready to put out 64363670Snsayer */ 64463670Snsayerstatic void 645156783Semaxtapifstart(struct ifnet *ifp) 64663670Snsayer{ 64763670Snsayer struct tap_softc *tp = ifp->if_softc; 64863670Snsayer int s; 64963670Snsayer 650121816Sbrooks TAPDEBUG("%s starting\n", ifp->if_xname); 65163670Snsayer 65263803Snsayer /* 65363803Snsayer * do not junk pending output if we are in VMnet mode. 65463803Snsayer * XXX: can this do any harm because of queue overflow? 65563803Snsayer */ 65663803Snsayer 657127098Srwatson mtx_lock(&tp->tap_mtx); 658111742Sdes if (((tp->tap_flags & TAP_VMNET) == 0) && 65963803Snsayer ((tp->tap_flags & TAP_READY) != TAP_READY)) { 66063670Snsayer struct mbuf *m = NULL; 66163670Snsayer 662127098Srwatson mtx_unlock(&tp->tap_mtx); 663127098Srwatson 664127098Srwatson /* Unlocked read. */ 665121816Sbrooks TAPDEBUG("%s not ready, tap_flags = 0x%x\n", ifp->if_xname, 666121816Sbrooks tp->tap_flags); 66763670Snsayer 66863670Snsayer s = splimp(); 66963670Snsayer do { 67063670Snsayer IF_DEQUEUE(&ifp->if_snd, m); 67163670Snsayer if (m != NULL) 67263670Snsayer m_freem(m); 67363670Snsayer ifp->if_oerrors ++; 67463670Snsayer } while (m != NULL); 67563670Snsayer splx(s); 67663670Snsayer 67763670Snsayer return; 67863670Snsayer } 679127098Srwatson mtx_unlock(&tp->tap_mtx); 68063670Snsayer 68163670Snsayer s = splimp(); 682148887Srwatson ifp->if_drv_flags |= IFF_DRV_OACTIVE; 68363670Snsayer 68463670Snsayer if (ifp->if_snd.ifq_len != 0) { 685127098Srwatson mtx_lock(&tp->tap_mtx); 68663670Snsayer if (tp->tap_flags & TAP_RWAIT) { 68763670Snsayer tp->tap_flags &= ~TAP_RWAIT; 688111748Sdes wakeup(tp); 68963670Snsayer } 69063670Snsayer 691127098Srwatson if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) { 692127098Srwatson mtx_unlock(&tp->tap_mtx); 69395883Salfred pgsigio(&tp->tap_sigio, SIGIO, 0); 694127098Srwatson } else 695127098Srwatson mtx_unlock(&tp->tap_mtx); 69663670Snsayer 697122352Stanimura selwakeuppri(&tp->tap_rsel, PZERO+1); 698156783Semax KNOTE_UNLOCKED(&tp->tap_rsel.si_note, 0); 69963670Snsayer ifp->if_opackets ++; /* obytes are counted in ether_output */ 70063670Snsayer } 70163670Snsayer 702148887Srwatson ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 70363670Snsayer splx(s); 70463670Snsayer} /* tapifstart */ 70563670Snsayer 70663670Snsayer 70763670Snsayer/* 70863670Snsayer * tapioctl 70963670Snsayer * 71063670Snsayer * the cdevsw interface is now pretty minimal 71163670Snsayer */ 71263670Snsayerstatic int 713156783Semaxtapioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 71463670Snsayer{ 71563670Snsayer struct tap_softc *tp = dev->si_drv1; 716147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 717111742Sdes struct tapinfo *tapp = NULL; 71863670Snsayer int s; 719102052Ssobomax int f; 720162711Sru#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 721162711Sru defined(COMPAT_FREEBSD4) 722162711Sru int ival; 723162711Sru#endif 72463670Snsayer 72563670Snsayer switch (cmd) { 726111742Sdes case TAPSIFINFO: 72763670Snsayer s = splimp(); 728111742Sdes tapp = (struct tapinfo *)data; 729111742Sdes ifp->if_mtu = tapp->mtu; 730111742Sdes ifp->if_type = tapp->type; 731111742Sdes ifp->if_baudrate = tapp->baudrate; 73263670Snsayer splx(s); 733111742Sdes break; 73463670Snsayer 735111742Sdes case TAPGIFINFO: 736111742Sdes tapp = (struct tapinfo *)data; 737111742Sdes tapp->mtu = ifp->if_mtu; 738111742Sdes tapp->type = ifp->if_type; 739111742Sdes tapp->baudrate = ifp->if_baudrate; 740111742Sdes break; 74163670Snsayer 74263670Snsayer case TAPSDEBUG: 743159079Smarius tapdebug = *(int *)data; 74483043Sbrooks break; 74563670Snsayer 74663670Snsayer case TAPGDEBUG: 747159079Smarius *(int *)data = tapdebug; 74883043Sbrooks break; 74963670Snsayer 750182880Semax case TAPGIFNAME: { 751182880Semax struct ifreq *ifr = (struct ifreq *) data; 752182880Semax 753182880Semax strlcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ); 754182880Semax } break; 755182880Semax 75663670Snsayer case FIONBIO: 75783043Sbrooks break; 75863670Snsayer 75963670Snsayer case FIOASYNC: 76063803Snsayer s = splimp(); 761127098Srwatson mtx_lock(&tp->tap_mtx); 762159079Smarius if (*(int *)data) 76363670Snsayer tp->tap_flags |= TAP_ASYNC; 76463670Snsayer else 76563670Snsayer tp->tap_flags &= ~TAP_ASYNC; 766127098Srwatson mtx_unlock(&tp->tap_mtx); 76763803Snsayer splx(s); 76883043Sbrooks break; 76963670Snsayer 77063670Snsayer case FIONREAD: 77163670Snsayer s = splimp(); 77263670Snsayer if (ifp->if_snd.ifq_head) { 77363670Snsayer struct mbuf *mb = ifp->if_snd.ifq_head; 77463670Snsayer 775159079Smarius for(*(int *)data = 0;mb != NULL;mb = mb->m_next) 776159079Smarius *(int *)data += mb->m_len; 77783043Sbrooks } else 778159079Smarius *(int *)data = 0; 77963670Snsayer splx(s); 78083043Sbrooks break; 78163670Snsayer 78263670Snsayer case FIOSETOWN: 783159079Smarius return (fsetown(*(int *)data, &tp->tap_sigio)); 78463670Snsayer 78563670Snsayer case FIOGETOWN: 786159079Smarius *(int *)data = fgetown(&tp->tap_sigio); 78763670Snsayer return (0); 78863670Snsayer 78963670Snsayer /* this is deprecated, FIOSETOWN should be used instead */ 79063670Snsayer case TIOCSPGRP: 791159079Smarius return (fsetown(-(*(int *)data), &tp->tap_sigio)); 79263670Snsayer 79363670Snsayer /* this is deprecated, FIOGETOWN should be used instead */ 79463670Snsayer case TIOCGPGRP: 795159079Smarius *(int *)data = -fgetown(&tp->tap_sigio); 79663670Snsayer return (0); 79763670Snsayer 79863670Snsayer /* VMware/VMnet port ioctl's */ 79963670Snsayer 80063670Snsayer case SIOCGIFFLAGS: /* get ifnet flags */ 80163670Snsayer bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags)); 80283043Sbrooks break; 80363670Snsayer 804162711Sru#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 805162711Sru defined(COMPAT_FREEBSD4) 806162711Sru case _IO('V', 0): 807162711Sru ival = IOCPARM_IVAL(data); 808162711Sru data = (caddr_t)&ival; 809162711Sru /* FALLTHROUGH */ 810162711Sru#endif 81183043Sbrooks case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 812162711Sru f = *(int *)data; 81363670Snsayer f &= 0x0fff; 81463670Snsayer f &= ~IFF_CANTCHANGE; 81563670Snsayer f |= IFF_UP; 81663670Snsayer 81763670Snsayer s = splimp(); 81863670Snsayer ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE); 81963670Snsayer splx(s); 82083043Sbrooks break; 82163670Snsayer 82263861Snsayer case OSIOCGIFADDR: /* get MAC address of the remote side */ 82363670Snsayer case SIOCGIFADDR: 824127165Srwatson mtx_lock(&tp->tap_mtx); 82563861Snsayer bcopy(tp->ether_addr, data, sizeof(tp->ether_addr)); 826127165Srwatson mtx_unlock(&tp->tap_mtx); 82783043Sbrooks break; 82863670Snsayer 82963861Snsayer case SIOCSIFADDR: /* set MAC address of the remote side */ 830127165Srwatson mtx_lock(&tp->tap_mtx); 83163861Snsayer bcopy(data, tp->ether_addr, sizeof(tp->ether_addr)); 832127165Srwatson mtx_unlock(&tp->tap_mtx); 83383043Sbrooks break; 83463670Snsayer 83563670Snsayer default: 83663670Snsayer return (ENOTTY); 83763670Snsayer } 83863670Snsayer return (0); 83963670Snsayer} /* tapioctl */ 84063670Snsayer 84163670Snsayer 84263670Snsayer/* 84363670Snsayer * tapread 84463670Snsayer * 84563670Snsayer * the cdevsw read interface - reads a packet at a time, or at 84663670Snsayer * least as much of a packet as can be read 84763670Snsayer */ 84863670Snsayerstatic int 849156783Semaxtapread(struct cdev *dev, struct uio *uio, int flag) 85063670Snsayer{ 85163670Snsayer struct tap_softc *tp = dev->si_drv1; 852147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 85390227Sdillon struct mbuf *m = NULL; 85463670Snsayer int error = 0, len, s; 85563670Snsayer 856183397Sed TAPDEBUG("%s reading, minor = %#x\n", ifp->if_xname, dev2unit(dev)); 85763670Snsayer 858127098Srwatson mtx_lock(&tp->tap_mtx); 85963670Snsayer if ((tp->tap_flags & TAP_READY) != TAP_READY) { 860127098Srwatson mtx_unlock(&tp->tap_mtx); 861127098Srwatson 862127098Srwatson /* Unlocked read. */ 863121816Sbrooks TAPDEBUG("%s not ready. minor = %#x, tap_flags = 0x%x\n", 864183397Sed ifp->if_xname, dev2unit(dev), tp->tap_flags); 86563803Snsayer 86663670Snsayer return (EHOSTDOWN); 86763670Snsayer } 86863670Snsayer 86963670Snsayer tp->tap_flags &= ~TAP_RWAIT; 870127098Srwatson mtx_unlock(&tp->tap_mtx); 87163670Snsayer 87263670Snsayer /* sleep until we get a packet */ 87363670Snsayer do { 87463670Snsayer s = splimp(); 87590227Sdillon IF_DEQUEUE(&ifp->if_snd, m); 87663670Snsayer splx(s); 87763670Snsayer 87890227Sdillon if (m == NULL) { 879139207Sphk if (flag & O_NONBLOCK) 88063670Snsayer return (EWOULDBLOCK); 881111742Sdes 882127098Srwatson mtx_lock(&tp->tap_mtx); 88363670Snsayer tp->tap_flags |= TAP_RWAIT; 884127098Srwatson mtx_unlock(&tp->tap_mtx); 885111748Sdes error = tsleep(tp,PCATCH|(PZERO+1),"taprd",0); 88663670Snsayer if (error) 88763670Snsayer return (error); 88863670Snsayer } 88990227Sdillon } while (m == NULL); 89063670Snsayer 89163670Snsayer /* feed packet to bpf */ 892106939Ssam BPF_MTAP(ifp, m); 89363670Snsayer 89463670Snsayer /* xfer packet to user space */ 89590227Sdillon while ((m != NULL) && (uio->uio_resid > 0) && (error == 0)) { 89690227Sdillon len = min(uio->uio_resid, m->m_len); 89763670Snsayer if (len == 0) 89863670Snsayer break; 89963670Snsayer 900111741Sdes error = uiomove(mtod(m, void *), len, uio); 90190227Sdillon m = m_free(m); 90263670Snsayer } 90363670Snsayer 90490227Sdillon if (m != NULL) { 905121816Sbrooks TAPDEBUG("%s dropping mbuf, minor = %#x\n", ifp->if_xname, 906183397Sed dev2unit(dev)); 90790227Sdillon m_freem(m); 90863670Snsayer } 90963670Snsayer 91063670Snsayer return (error); 91163670Snsayer} /* tapread */ 91263670Snsayer 91363670Snsayer 91463670Snsayer/* 91563670Snsayer * tapwrite 91663670Snsayer * 91763670Snsayer * the cdevsw write interface - an atomic write is a packet - or else! 91863670Snsayer */ 91963670Snsayerstatic int 920156783Semaxtapwrite(struct cdev *dev, struct uio *uio, int flag) 92163670Snsayer{ 922166443Sbms struct ether_header *eh; 92363670Snsayer struct tap_softc *tp = dev->si_drv1; 924147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 925137101Sglebius struct mbuf *m; 92663670Snsayer 927121816Sbrooks TAPDEBUG("%s writting, minor = %#x\n", 928183397Sed ifp->if_xname, dev2unit(dev)); 92963670Snsayer 93063670Snsayer if (uio->uio_resid == 0) 93163670Snsayer return (0); 93263670Snsayer 93363670Snsayer if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) { 934194990Skib TAPDEBUG("%s invalid packet len = %zd, minor = %#x\n", 935183397Sed ifp->if_xname, uio->uio_resid, dev2unit(dev)); 93663803Snsayer 93763670Snsayer return (EIO); 93863670Snsayer } 93963670Snsayer 940163915Sandre if ((m = m_uiotombuf(uio, M_DONTWAIT, 0, ETHER_ALIGN, 941163915Sandre M_PKTHDR)) == NULL) { 94263670Snsayer ifp->if_ierrors ++; 943163986Scsjp return (ENOBUFS); 94463670Snsayer } 94563670Snsayer 946137101Sglebius m->m_pkthdr.rcvif = ifp; 947111742Sdes 948166443Sbms /* 949166443Sbms * Only pass a unicast frame to ether_input(), if it would actually 950166443Sbms * have been received by non-virtual hardware. 951166443Sbms */ 952166443Sbms if (m->m_len < sizeof(struct ether_header)) { 953166443Sbms m_freem(m); 954166443Sbms return (0); 955166443Sbms } 956166443Sbms eh = mtod(m, struct ether_header *); 957166443Sbms 958166443Sbms if (eh && (ifp->if_flags & IFF_PROMISC) == 0 && 959166443Sbms !ETHER_IS_MULTICAST(eh->ether_dhost) && 960166443Sbms bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) { 961166443Sbms m_freem(m); 962166443Sbms return (0); 963166443Sbms } 964166443Sbms 965106939Ssam /* Pass packet up to parent. */ 966137101Sglebius (*ifp->if_input)(ifp, m); 967106939Ssam ifp->if_ipackets ++; /* ibytes are counted in parent */ 96863670Snsayer 96963670Snsayer return (0); 97063670Snsayer} /* tapwrite */ 97163670Snsayer 97263670Snsayer 97363670Snsayer/* 97463670Snsayer * tappoll 97563670Snsayer * 97663670Snsayer * the poll interface, this is only useful on reads 97763670Snsayer * really. the write detect always returns true, write never blocks 97863670Snsayer * anyway, it either accepts the packet or drops it 97963670Snsayer */ 98063670Snsayerstatic int 981156783Semaxtappoll(struct cdev *dev, int events, struct thread *td) 98263670Snsayer{ 98363670Snsayer struct tap_softc *tp = dev->si_drv1; 984147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 985111742Sdes int s, revents = 0; 98663670Snsayer 987121816Sbrooks TAPDEBUG("%s polling, minor = %#x\n", 988183397Sed ifp->if_xname, dev2unit(dev)); 98963670Snsayer 99063670Snsayer s = splimp(); 99163670Snsayer if (events & (POLLIN | POLLRDNORM)) { 99263670Snsayer if (ifp->if_snd.ifq_len > 0) { 993121816Sbrooks TAPDEBUG("%s have data in queue. len = %d, " \ 994121816Sbrooks "minor = %#x\n", ifp->if_xname, 995183397Sed ifp->if_snd.ifq_len, dev2unit(dev)); 99663803Snsayer 99763670Snsayer revents |= (events & (POLLIN | POLLRDNORM)); 99883043Sbrooks } else { 999121816Sbrooks TAPDEBUG("%s waiting for data, minor = %#x\n", 1000183397Sed ifp->if_xname, dev2unit(dev)); 100163803Snsayer 100283805Sjhb selrecord(td, &tp->tap_rsel); 100363670Snsayer } 100463670Snsayer } 100563670Snsayer 100663670Snsayer if (events & (POLLOUT | POLLWRNORM)) 100763670Snsayer revents |= (events & (POLLOUT | POLLWRNORM)); 100863670Snsayer 100963670Snsayer splx(s); 101063670Snsayer return (revents); 101163670Snsayer} /* tappoll */ 1012156783Semax 1013156783Semax 1014156783Semax/* 1015156783Semax * tap_kqfilter 1016156783Semax * 1017156783Semax * support for kevent() system call 1018156783Semax */ 1019156783Semaxstatic int 1020156783Semaxtapkqfilter(struct cdev *dev, struct knote *kn) 1021156783Semax{ 1022156783Semax int s; 1023156783Semax struct tap_softc *tp = dev->si_drv1; 1024156783Semax struct ifnet *ifp = tp->tap_ifp; 1025156783Semax 1026156783Semax s = splimp(); 1027156783Semax switch (kn->kn_filter) { 1028156783Semax case EVFILT_READ: 1029156783Semax TAPDEBUG("%s kqfilter: EVFILT_READ, minor = %#x\n", 1030183397Sed ifp->if_xname, dev2unit(dev)); 1031156783Semax kn->kn_fop = &tap_read_filterops; 1032156783Semax break; 1033156783Semax 1034156783Semax case EVFILT_WRITE: 1035156783Semax TAPDEBUG("%s kqfilter: EVFILT_WRITE, minor = %#x\n", 1036183397Sed ifp->if_xname, dev2unit(dev)); 1037156783Semax kn->kn_fop = &tap_write_filterops; 1038156783Semax break; 1039156783Semax 1040156783Semax default: 1041156783Semax TAPDEBUG("%s kqfilter: invalid filter, minor = %#x\n", 1042183397Sed ifp->if_xname, dev2unit(dev)); 1043156783Semax splx(s); 1044156783Semax return (EINVAL); 1045156783Semax /* NOT REACHED */ 1046156783Semax } 1047156783Semax splx(s); 1048156783Semax 1049156783Semax kn->kn_hook = (caddr_t) dev; 1050156783Semax knlist_add(&tp->tap_rsel.si_note, kn, 0); 1051156783Semax 1052156783Semax return (0); 1053156783Semax} /* tapkqfilter */ 1054156783Semax 1055156783Semax 1056156783Semax/* 1057156783Semax * tap_kqread 1058156783Semax * 1059156783Semax * Return true if there is data in the interface queue 1060156783Semax */ 1061156783Semaxstatic int 1062156783Semaxtapkqread(struct knote *kn, long hint) 1063156783Semax{ 1064156783Semax int ret, s; 1065156783Semax struct cdev *dev = (struct cdev *)(kn->kn_hook); 1066156783Semax struct tap_softc *tp = dev->si_drv1; 1067156783Semax struct ifnet *ifp = tp->tap_ifp; 1068156783Semax 1069156783Semax s = splimp(); 1070156783Semax if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) { 1071156783Semax TAPDEBUG("%s have data in queue. len = %d, minor = %#x\n", 1072183397Sed ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev)); 1073156783Semax ret = 1; 1074156783Semax } else { 1075156783Semax TAPDEBUG("%s waiting for data, minor = %#x\n", 1076183397Sed ifp->if_xname, dev2unit(dev)); 1077156783Semax ret = 0; 1078156783Semax } 1079156783Semax splx(s); 1080156783Semax 1081156783Semax return (ret); 1082156783Semax} /* tapkqread */ 1083156783Semax 1084156783Semax 1085156783Semax/* 1086156783Semax * tap_kqwrite 1087156783Semax * 1088156783Semax * Always can write. Return the MTU in kn->data 1089156783Semax */ 1090156783Semaxstatic int 1091156783Semaxtapkqwrite(struct knote *kn, long hint) 1092156783Semax{ 1093156783Semax int s; 1094156783Semax struct tap_softc *tp = ((struct cdev *) kn->kn_hook)->si_drv1; 1095156783Semax struct ifnet *ifp = tp->tap_ifp; 1096156783Semax 1097156783Semax s = splimp(); 1098156783Semax kn->kn_data = ifp->if_mtu; 1099156783Semax splx(s); 1100156783Semax 1101156783Semax return (1); 1102156783Semax} /* tapkqwrite */ 1103156783Semax 1104156783Semax 1105156783Semaxstatic void 1106156783Semaxtapkqdetach(struct knote *kn) 1107156783Semax{ 1108156783Semax struct tap_softc *tp = ((struct cdev *) kn->kn_hook)->si_drv1; 1109156783Semax 1110156783Semax knlist_remove(&tp->tap_rsel.si_note, kn, 0); 1111156783Semax} /* tapkqdetach */ 1112156783Semax 1113