if_tap.c revision 213028
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 213028 2010-09-22 21:02:43Z jhb $ 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, 135213028Sjhb .d_flags = D_PSEUDO | 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 213166497Sbms /* Unlocked read. */ 214166497Sbms KASSERT(!(tp->tap_flags & TAP_OPEN), 215166497Sbms ("%s flags is out of sync", ifp->if_xname)); 216166497Sbms 217166497Sbms knlist_destroy(&tp->tap_rsel.si_note); 218166497Sbms destroy_dev(tp->tap_dev); 219166497Sbms ether_ifdetach(ifp); 220166497Sbms if_free_type(ifp, IFT_ETHER); 221166497Sbms 222166497Sbms mtx_destroy(&tp->tap_mtx); 223166497Sbms free(tp, M_TAP); 224166497Sbms} 225166497Sbms 226166497Sbmsstatic void 227166497Sbmstap_clone_destroy(struct ifnet *ifp) 228166497Sbms{ 229166497Sbms struct tap_softc *tp = ifp->if_softc; 230166497Sbms 231166497Sbms mtx_lock(&tapmtx); 232166497Sbms SLIST_REMOVE(&taphead, tp, tap_softc, tap_next); 233166497Sbms mtx_unlock(&tapmtx); 234166497Sbms tap_destroy(tp); 235166497Sbms} 236166497Sbms 237166497Sbms/* vmnet devices are tap devices in disguise */ 238166497Sbmsstatic void 239166497Sbmsvmnet_clone_destroy(struct ifnet *ifp) 240166497Sbms{ 241166497Sbms tap_clone_destroy(ifp); 242166497Sbms} 243166497Sbms 24463670Snsayer/* 24563670Snsayer * tapmodevent 24663670Snsayer * 24763670Snsayer * module event handler 24863670Snsayer */ 24963670Snsayerstatic int 250156783Semaxtapmodevent(module_t mod, int type, void *data) 25163670Snsayer{ 25283043Sbrooks static eventhandler_tag eh_tag = NULL; 25383043Sbrooks struct tap_softc *tp = NULL; 25483043Sbrooks struct ifnet *ifp = NULL; 25563670Snsayer 25663670Snsayer switch (type) { 25763670Snsayer case MOD_LOAD: 25863670Snsayer 25983043Sbrooks /* intitialize device */ 26083043Sbrooks 261127003Srwatson mtx_init(&tapmtx, "tapmtx", NULL, MTX_DEF); 26283043Sbrooks SLIST_INIT(&taphead); 26383043Sbrooks 264126845Sphk clone_setup(&tapclones); 26571602Sphk eh_tag = EVENTHANDLER_REGISTER(dev_clone, tapclone, 0, 1000); 266127003Srwatson if (eh_tag == NULL) { 267127170Srwatson clone_cleanup(&tapclones); 268127003Srwatson mtx_destroy(&tapmtx); 269126077Sphk return (ENOMEM); 270127003Srwatson } 271166497Sbms if_clone_attach(&tap_cloner); 272166497Sbms if_clone_attach(&vmnet_cloner); 27383043Sbrooks return (0); 27463670Snsayer 27583043Sbrooks case MOD_UNLOAD: 276127003Srwatson /* 277127003Srwatson * The EBUSY algorithm here can't quite atomically 278127003Srwatson * guarantee that this is race-free since we have to 279127003Srwatson * release the tap mtx to deregister the clone handler. 280127003Srwatson */ 281127003Srwatson mtx_lock(&tapmtx); 282127003Srwatson SLIST_FOREACH(tp, &taphead, tap_next) { 283127098Srwatson mtx_lock(&tp->tap_mtx); 284127003Srwatson if (tp->tap_flags & TAP_OPEN) { 285127098Srwatson mtx_unlock(&tp->tap_mtx); 286127003Srwatson mtx_unlock(&tapmtx); 28783043Sbrooks return (EBUSY); 288127003Srwatson } 289127098Srwatson mtx_unlock(&tp->tap_mtx); 290127003Srwatson } 291127003Srwatson mtx_unlock(&tapmtx); 29283043Sbrooks 29371602Sphk EVENTHANDLER_DEREGISTER(dev_clone, eh_tag); 294166497Sbms if_clone_detach(&tap_cloner); 295166497Sbms if_clone_detach(&vmnet_cloner); 296204464Skib drain_dev_clone_events(); 29763670Snsayer 298127003Srwatson mtx_lock(&tapmtx); 29983043Sbrooks while ((tp = SLIST_FIRST(&taphead)) != NULL) { 30083043Sbrooks SLIST_REMOVE_HEAD(&taphead, tap_next); 301127003Srwatson mtx_unlock(&tapmtx); 30283043Sbrooks 303147256Sbrooks ifp = tp->tap_ifp; 30483043Sbrooks 305121816Sbrooks TAPDEBUG("detaching %s\n", ifp->if_xname); 30683043Sbrooks 307166497Sbms tap_destroy(tp); 308127003Srwatson mtx_lock(&tapmtx); 30983043Sbrooks } 310127003Srwatson mtx_unlock(&tapmtx); 311126077Sphk clone_cleanup(&tapclones); 31263670Snsayer 313135354Srwatson mtx_destroy(&tapmtx); 314135354Srwatson 31583043Sbrooks break; 31663670Snsayer 31763670Snsayer default: 31863670Snsayer return (EOPNOTSUPP); 31963670Snsayer } 32063670Snsayer 32163670Snsayer return (0); 32263670Snsayer} /* tapmodevent */ 32363670Snsayer 32463670Snsayer 32563670Snsayer/* 32671602Sphk * DEVFS handler 32771602Sphk * 32871602Sphk * We need to support two kind of devices - tap and vmnet 32971602Sphk */ 33071602Sphkstatic void 331156783Semaxtapclone(void *arg, struct ucred *cred, char *name, int namelen, struct cdev **dev) 33271602Sphk{ 333166497Sbms char devname[SPECNAMELEN + 1]; 334166497Sbms int i, unit, append_unit; 335166438Sbms int extra; 33671602Sphk 337130640Sphk if (*dev != NULL) 33871602Sphk return; 33971602Sphk 340166514Sbms if (!tapdclone || 341166514Sbms (!tapuopen && priv_check_cred(cred, PRIV_NET_IFCREATE, 0) != 0)) 342166497Sbms return; 343166497Sbms 344166497Sbms unit = 0; 345166497Sbms append_unit = 0; 346126077Sphk extra = 0; 347166497Sbms 348166497Sbms /* We're interested in only tap/vmnet devices. */ 349126077Sphk if (strcmp(name, TAP) == 0) { 350126077Sphk unit = -1; 351126077Sphk } else if (strcmp(name, VMNET) == 0) { 352126077Sphk unit = -1; 353126077Sphk extra = VMNET_DEV_MASK; 354166497Sbms } else if (dev_stdclone(name, NULL, TAP, &unit) != 1) { 355166497Sbms if (dev_stdclone(name, NULL, VMNET, &unit) != 1) { 356126077Sphk return; 357166497Sbms } else { 358166497Sbms extra = VMNET_DEV_MASK; 359166497Sbms } 36083043Sbrooks } 36171602Sphk 362166497Sbms if (unit == -1) 363166497Sbms append_unit = 1; 364166497Sbms 365126077Sphk /* find any existing device, or allocate new unit number */ 366126077Sphk i = clone_create(&tapclones, &tap_cdevsw, &unit, dev, extra); 367126077Sphk if (i) { 368166497Sbms if (append_unit) { 369166497Sbms /* 370166497Sbms * We were passed 'tun' or 'tap', with no unit specified 371166497Sbms * so we'll need to append it now. 372166497Sbms */ 373166497Sbms namelen = snprintf(devname, sizeof(devname), "%s%d", name, 374166497Sbms unit); 375166497Sbms name = devname; 376166497Sbms } 377166497Sbms 378204464Skib *dev = make_dev_credf(MAKEDEV_REF, &tap_cdevsw, unit | extra, 379204464Skib cred, UID_ROOT, GID_WHEEL, 0600, "%s", name); 38071602Sphk } 381166497Sbms 382166497Sbms if_clone_create(name, namelen, NULL); 38371602Sphk} /* tapclone */ 38471602Sphk 38571602Sphk 38671602Sphk/* 38763670Snsayer * tapcreate 38863670Snsayer * 38963670Snsayer * to create interface 39063670Snsayer */ 39163670Snsayerstatic void 392156783Semaxtapcreate(struct cdev *dev) 39363670Snsayer{ 39463670Snsayer struct ifnet *ifp = NULL; 39563670Snsayer struct tap_softc *tp = NULL; 39663670Snsayer unsigned short macaddr_hi; 397178221Semax uint32_t macaddr_mid; 398213028Sjhb int unit; 39963670Snsayer char *name = NULL; 400147256Sbrooks u_char eaddr[6]; 40163670Snsayer 402126077Sphk dev->si_flags &= ~SI_CHEAPCLONE; 403126077Sphk 40463670Snsayer /* allocate driver storage and create device */ 405184205Sdes tp = malloc(sizeof(*tp), M_TAP, M_WAITOK | M_ZERO); 406127098Srwatson mtx_init(&tp->tap_mtx, "tap_mtx", NULL, MTX_DEF); 407127003Srwatson mtx_lock(&tapmtx); 40883043Sbrooks SLIST_INSERT_HEAD(&taphead, tp, tap_next); 409127003Srwatson mtx_unlock(&tapmtx); 41063670Snsayer 411126796Sphk unit = dev2unit(dev); 41283043Sbrooks 41363670Snsayer /* select device: tap or vmnet */ 414126796Sphk if (unit & VMNET_DEV_MASK) { 41563670Snsayer name = VMNET; 41663803Snsayer tp->tap_flags |= TAP_VMNET; 41783043Sbrooks } else 41863670Snsayer name = TAP; 41963670Snsayer 420126796Sphk unit &= TAPMAXUNIT; 421126796Sphk 422183397Sed TAPDEBUG("tapcreate(%s%d). minor = %#x\n", name, unit, dev2unit(dev)); 42383043Sbrooks 42463670Snsayer /* generate fake MAC address: 00 bd xx xx xx unit_no */ 42563670Snsayer macaddr_hi = htons(0x00bd); 426178221Semax macaddr_mid = (uint32_t) ticks; 427147256Sbrooks bcopy(&macaddr_hi, eaddr, sizeof(short)); 428178221Semax bcopy(&macaddr_mid, &eaddr[2], sizeof(uint32_t)); 429147256Sbrooks eaddr[5] = (u_char)unit; 43063670Snsayer 431111742Sdes /* fill the rest and attach interface */ 432147256Sbrooks ifp = tp->tap_ifp = if_alloc(IFT_ETHER); 433147256Sbrooks if (ifp == NULL) 434147256Sbrooks panic("%s%d: can not if_alloc()", name, unit); 43563670Snsayer ifp->if_softc = tp; 436121816Sbrooks if_initname(ifp, name, unit); 43763670Snsayer ifp->if_init = tapifinit; 43863670Snsayer ifp->if_start = tapifstart; 43963670Snsayer ifp->if_ioctl = tapifioctl; 44063670Snsayer ifp->if_mtu = ETHERMTU; 44163670Snsayer ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST); 442213028Sjhb IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 443205222Sqingli ifp->if_capabilities |= IFCAP_LINKSTATE; 444205222Sqingli ifp->if_capenable |= IFCAP_LINKSTATE; 44563670Snsayer 44683043Sbrooks dev->si_drv1 = tp; 447126077Sphk tp->tap_dev = dev; 44883043Sbrooks 449147256Sbrooks ether_ifattach(ifp, eaddr); 45063670Snsayer 451127098Srwatson mtx_lock(&tp->tap_mtx); 45263803Snsayer tp->tap_flags |= TAP_INITED; 453127098Srwatson mtx_unlock(&tp->tap_mtx); 45463803Snsayer 455213028Sjhb knlist_init_mtx(&tp->tap_rsel.si_note, &tp->tap_mtx); 456158697Semax 457121816Sbrooks TAPDEBUG("interface %s is created. minor = %#x\n", 458183397Sed ifp->if_xname, dev2unit(dev)); 45963670Snsayer} /* tapcreate */ 46063670Snsayer 46163670Snsayer 46263670Snsayer/* 463111742Sdes * tapopen 46463670Snsayer * 46563670Snsayer * to open tunnel. must be superuser 46663670Snsayer */ 46763670Snsayerstatic int 468156783Semaxtapopen(struct cdev *dev, int flag, int mode, struct thread *td) 46963670Snsayer{ 47063670Snsayer struct tap_softc *tp = NULL; 471133460Semax struct ifnet *ifp = NULL; 472213028Sjhb int error; 47363670Snsayer 474164033Srwatson if (tapuopen == 0) { 475164033Srwatson error = priv_check(td, PRIV_NET_TAP); 476164033Srwatson if (error) 477164033Srwatson return (error); 478164033Srwatson } 47963670Snsayer 480126796Sphk if ((dev2unit(dev) & CLONE_UNITMASK) > TAPMAXUNIT) 481126796Sphk return (ENXIO); 48283043Sbrooks 48363670Snsayer tp = dev->si_drv1; 48463670Snsayer 485127165Srwatson mtx_lock(&tp->tap_mtx); 486127165Srwatson if (tp->tap_flags & TAP_OPEN) { 487127165Srwatson mtx_unlock(&tp->tap_mtx); 488127165Srwatson return (EBUSY); 489127165Srwatson } 49063670Snsayer 491152315Sru bcopy(IF_LLADDR(tp->tap_ifp), tp->ether_addr, sizeof(tp->ether_addr)); 49283366Sjulian tp->tap_pid = td->td_proc->p_pid; 49363670Snsayer tp->tap_flags |= TAP_OPEN; 494147256Sbrooks ifp = tp->tap_ifp; 49563670Snsayer 496148887Srwatson ifp->if_drv_flags |= IFF_DRV_RUNNING; 497148887Srwatson ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 498167713Sbms if (tapuponopen) 499167713Sbms ifp->if_flags |= IFF_UP; 500205024Sqingli if_link_state_change(ifp, LINK_STATE_UP); 501213028Sjhb mtx_unlock(&tp->tap_mtx); 50263670Snsayer 503183397Sed TAPDEBUG("%s is open. minor = %#x\n", ifp->if_xname, dev2unit(dev)); 504133460Semax 50563670Snsayer return (0); 50663670Snsayer} /* tapopen */ 50763670Snsayer 50863670Snsayer 50963670Snsayer/* 51063670Snsayer * tapclose 51163670Snsayer * 51263670Snsayer * close the device - mark i/f down & delete routing info 51363670Snsayer */ 51463670Snsayerstatic int 515156783Semaxtapclose(struct cdev *dev, int foo, int bar, struct thread *td) 51663670Snsayer{ 517156783Semax struct ifaddr *ifa; 51863670Snsayer struct tap_softc *tp = dev->si_drv1; 519147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 52063670Snsayer 52163670Snsayer /* junk all pending output */ 522213028Sjhb mtx_lock(&tp->tap_mtx); 52383043Sbrooks IF_DRAIN(&ifp->if_snd); 52463670Snsayer 52563803Snsayer /* 52663803Snsayer * do not bring the interface down, and do not anything with 52763803Snsayer * interface, if we are in VMnet mode. just close the device. 52863803Snsayer */ 52963803Snsayer 53063803Snsayer if (((tp->tap_flags & TAP_VMNET) == 0) && (ifp->if_flags & IFF_UP)) { 531127098Srwatson mtx_unlock(&tp->tap_mtx); 53263670Snsayer if_down(ifp); 533213028Sjhb mtx_lock(&tp->tap_mtx); 534148887Srwatson if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 535213028Sjhb ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 536213028Sjhb mtx_unlock(&tp->tap_mtx); 53763803Snsayer TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 538146620Speadar rtinit(ifa, (int)RTM_DELETE, 0); 53963670Snsayer } 540146620Speadar if_purgeaddrs(ifp); 541213028Sjhb mtx_lock(&tp->tap_mtx); 54263670Snsayer } 543213028Sjhb } 54463670Snsayer 545205024Sqingli if_link_state_change(ifp, LINK_STATE_DOWN); 54696122Salfred funsetown(&tp->tap_sigio); 547122352Stanimura selwakeuppri(&tp->tap_rsel, PZERO+1); 548213028Sjhb KNOTE_LOCKED(&tp->tap_rsel.si_note, 0); 54963670Snsayer 55063670Snsayer tp->tap_flags &= ~TAP_OPEN; 55163670Snsayer tp->tap_pid = 0; 552127098Srwatson mtx_unlock(&tp->tap_mtx); 55363670Snsayer 554121816Sbrooks TAPDEBUG("%s is closed. minor = %#x\n", 555183397Sed ifp->if_xname, dev2unit(dev)); 55663670Snsayer 55763670Snsayer return (0); 55863670Snsayer} /* tapclose */ 55963670Snsayer 56063670Snsayer 56163670Snsayer/* 56263670Snsayer * tapifinit 56363670Snsayer * 56463670Snsayer * network interface initialization function 56563670Snsayer */ 56663670Snsayerstatic void 567156783Semaxtapifinit(void *xtp) 56863670Snsayer{ 56963670Snsayer struct tap_softc *tp = (struct tap_softc *)xtp; 570147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 57163670Snsayer 572121816Sbrooks TAPDEBUG("initializing %s\n", ifp->if_xname); 57363670Snsayer 574213028Sjhb mtx_lock(&tp->tap_mtx); 575148887Srwatson ifp->if_drv_flags |= IFF_DRV_RUNNING; 576148887Srwatson ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 577213028Sjhb mtx_unlock(&tp->tap_mtx); 57863670Snsayer 57963670Snsayer /* attempt to start output */ 58063670Snsayer tapifstart(ifp); 58163670Snsayer} /* tapifinit */ 58263670Snsayer 58363670Snsayer 58463670Snsayer/* 58563670Snsayer * tapifioctl 58663670Snsayer * 58763670Snsayer * Process an ioctl request on network interface 58863670Snsayer */ 589105228Sphkstatic int 590156783Semaxtapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 59163670Snsayer{ 592160376Sbrooks struct tap_softc *tp = ifp->if_softc; 593189866Sscf struct ifreq *ifr = (struct ifreq *)data; 59463670Snsayer struct ifstat *ifs = NULL; 595213028Sjhb int dummy; 59663670Snsayer 59763670Snsayer switch (cmd) { 59863670Snsayer case SIOCSIFFLAGS: /* XXX -- just like vmnet does */ 59963670Snsayer case SIOCADDMULTI: 60063670Snsayer case SIOCDELMULTI: 60183043Sbrooks break; 60263670Snsayer 603189866Sscf case SIOCSIFMTU: 604189866Sscf ifp->if_mtu = ifr->ifr_mtu; 605189866Sscf break; 606189866Sscf 60763670Snsayer case SIOCGIFSTATUS: 60863670Snsayer ifs = (struct ifstat *)data; 60963670Snsayer dummy = strlen(ifs->ascii); 610127098Srwatson mtx_lock(&tp->tap_mtx); 61163670Snsayer if (tp->tap_pid != 0 && dummy < sizeof(ifs->ascii)) 61263670Snsayer snprintf(ifs->ascii + dummy, 61363670Snsayer sizeof(ifs->ascii) - dummy, 61463670Snsayer "\tOpened by PID %d\n", tp->tap_pid); 615127098Srwatson mtx_unlock(&tp->tap_mtx); 61683043Sbrooks break; 61763670Snsayer 61863670Snsayer default: 619213028Sjhb return (ether_ioctl(ifp, cmd, data)); 620156783Semax /* NOT REACHED */ 62163670Snsayer } 62263670Snsayer 62363670Snsayer return (0); 62463670Snsayer} /* tapifioctl */ 62563670Snsayer 62663670Snsayer 62763670Snsayer/* 628111742Sdes * tapifstart 629111742Sdes * 63063670Snsayer * queue packets from higher level ready to put out 63163670Snsayer */ 63263670Snsayerstatic void 633156783Semaxtapifstart(struct ifnet *ifp) 63463670Snsayer{ 63563670Snsayer struct tap_softc *tp = ifp->if_softc; 63663670Snsayer 637121816Sbrooks TAPDEBUG("%s starting\n", ifp->if_xname); 63863670Snsayer 63963803Snsayer /* 64063803Snsayer * do not junk pending output if we are in VMnet mode. 64163803Snsayer * XXX: can this do any harm because of queue overflow? 64263803Snsayer */ 64363803Snsayer 644127098Srwatson mtx_lock(&tp->tap_mtx); 645111742Sdes if (((tp->tap_flags & TAP_VMNET) == 0) && 64663803Snsayer ((tp->tap_flags & TAP_READY) != TAP_READY)) { 647213028Sjhb struct mbuf *m; 64863670Snsayer 649127098Srwatson /* Unlocked read. */ 650121816Sbrooks TAPDEBUG("%s not ready, tap_flags = 0x%x\n", ifp->if_xname, 651121816Sbrooks tp->tap_flags); 65263670Snsayer 653213028Sjhb for (;;) { 65463670Snsayer IF_DEQUEUE(&ifp->if_snd, m); 655213028Sjhb if (m != NULL) { 65663670Snsayer m_freem(m); 657213028Sjhb ifp->if_oerrors++; 658213028Sjhb } else 659213028Sjhb break; 660213028Sjhb } 661213028Sjhb mtx_unlock(&tp->tap_mtx); 66263670Snsayer 66363670Snsayer return; 66463670Snsayer } 66563670Snsayer 666148887Srwatson ifp->if_drv_flags |= IFF_DRV_OACTIVE; 66763670Snsayer 668213028Sjhb if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 66963670Snsayer if (tp->tap_flags & TAP_RWAIT) { 67063670Snsayer tp->tap_flags &= ~TAP_RWAIT; 671111748Sdes wakeup(tp); 67263670Snsayer } 67363670Snsayer 674127098Srwatson if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) { 675127098Srwatson mtx_unlock(&tp->tap_mtx); 67695883Salfred pgsigio(&tp->tap_sigio, SIGIO, 0); 677213028Sjhb mtx_lock(&tp->tap_mtx); 678213028Sjhb } 67963670Snsayer 680122352Stanimura selwakeuppri(&tp->tap_rsel, PZERO+1); 681213028Sjhb KNOTE_LOCKED(&tp->tap_rsel.si_note, 0); 68263670Snsayer ifp->if_opackets ++; /* obytes are counted in ether_output */ 68363670Snsayer } 68463670Snsayer 685148887Srwatson ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 686213028Sjhb mtx_unlock(&tp->tap_mtx); 68763670Snsayer} /* tapifstart */ 68863670Snsayer 68963670Snsayer 69063670Snsayer/* 69163670Snsayer * tapioctl 69263670Snsayer * 69363670Snsayer * the cdevsw interface is now pretty minimal 69463670Snsayer */ 69563670Snsayerstatic int 696156783Semaxtapioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 69763670Snsayer{ 69863670Snsayer struct tap_softc *tp = dev->si_drv1; 699147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 700111742Sdes struct tapinfo *tapp = NULL; 701102052Ssobomax int f; 702162711Sru#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 703162711Sru defined(COMPAT_FREEBSD4) 704162711Sru int ival; 705162711Sru#endif 70663670Snsayer 70763670Snsayer switch (cmd) { 708111742Sdes case TAPSIFINFO: 709111742Sdes tapp = (struct tapinfo *)data; 710213028Sjhb mtx_lock(&tp->tap_mtx); 711111742Sdes ifp->if_mtu = tapp->mtu; 712111742Sdes ifp->if_type = tapp->type; 713111742Sdes ifp->if_baudrate = tapp->baudrate; 714213028Sjhb mtx_unlock(&tp->tap_mtx); 715111742Sdes break; 71663670Snsayer 717111742Sdes case TAPGIFINFO: 718111742Sdes tapp = (struct tapinfo *)data; 719213028Sjhb mtx_lock(&tp->tap_mtx); 720111742Sdes tapp->mtu = ifp->if_mtu; 721111742Sdes tapp->type = ifp->if_type; 722111742Sdes tapp->baudrate = ifp->if_baudrate; 723213028Sjhb mtx_unlock(&tp->tap_mtx); 724111742Sdes break; 72563670Snsayer 72663670Snsayer case TAPSDEBUG: 727159079Smarius tapdebug = *(int *)data; 72883043Sbrooks break; 72963670Snsayer 73063670Snsayer case TAPGDEBUG: 731159079Smarius *(int *)data = tapdebug; 73283043Sbrooks break; 73363670Snsayer 734182880Semax case TAPGIFNAME: { 735182880Semax struct ifreq *ifr = (struct ifreq *) data; 736182880Semax 737182880Semax strlcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ); 738182880Semax } break; 739182880Semax 74063670Snsayer case FIONBIO: 74183043Sbrooks break; 74263670Snsayer 74363670Snsayer case FIOASYNC: 744127098Srwatson mtx_lock(&tp->tap_mtx); 745159079Smarius if (*(int *)data) 74663670Snsayer tp->tap_flags |= TAP_ASYNC; 74763670Snsayer else 74863670Snsayer tp->tap_flags &= ~TAP_ASYNC; 749127098Srwatson mtx_unlock(&tp->tap_mtx); 75083043Sbrooks break; 75163670Snsayer 75263670Snsayer case FIONREAD: 753213028Sjhb if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 754213028Sjhb struct mbuf *mb; 75563670Snsayer 756213028Sjhb IFQ_LOCK(&ifp->if_snd); 757213028Sjhb IFQ_POLL_NOLOCK(&ifp->if_snd, mb); 758213028Sjhb for (*(int *)data = 0; mb != NULL; 759213028Sjhb mb = mb->m_next) 760159079Smarius *(int *)data += mb->m_len; 761213028Sjhb IFQ_UNLOCK(&ifp->if_snd); 76283043Sbrooks } else 763159079Smarius *(int *)data = 0; 76483043Sbrooks break; 76563670Snsayer 76663670Snsayer case FIOSETOWN: 767159079Smarius return (fsetown(*(int *)data, &tp->tap_sigio)); 76863670Snsayer 76963670Snsayer case FIOGETOWN: 770159079Smarius *(int *)data = fgetown(&tp->tap_sigio); 77163670Snsayer return (0); 77263670Snsayer 77363670Snsayer /* this is deprecated, FIOSETOWN should be used instead */ 77463670Snsayer case TIOCSPGRP: 775159079Smarius return (fsetown(-(*(int *)data), &tp->tap_sigio)); 77663670Snsayer 77763670Snsayer /* this is deprecated, FIOGETOWN should be used instead */ 77863670Snsayer case TIOCGPGRP: 779159079Smarius *(int *)data = -fgetown(&tp->tap_sigio); 78063670Snsayer return (0); 78163670Snsayer 78263670Snsayer /* VMware/VMnet port ioctl's */ 78363670Snsayer 784162711Sru#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 785162711Sru defined(COMPAT_FREEBSD4) 786162711Sru case _IO('V', 0): 787162711Sru ival = IOCPARM_IVAL(data); 788162711Sru data = (caddr_t)&ival; 789162711Sru /* FALLTHROUGH */ 790162711Sru#endif 79183043Sbrooks case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 792162711Sru f = *(int *)data; 79363670Snsayer f &= 0x0fff; 79463670Snsayer f &= ~IFF_CANTCHANGE; 79563670Snsayer f |= IFF_UP; 79663670Snsayer 797213028Sjhb mtx_lock(&tp->tap_mtx); 79863670Snsayer ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE); 799213028Sjhb mtx_unlock(&tp->tap_mtx); 80083043Sbrooks break; 80163670Snsayer 80263861Snsayer case OSIOCGIFADDR: /* get MAC address of the remote side */ 80363670Snsayer case SIOCGIFADDR: 804127165Srwatson mtx_lock(&tp->tap_mtx); 80563861Snsayer bcopy(tp->ether_addr, data, sizeof(tp->ether_addr)); 806127165Srwatson mtx_unlock(&tp->tap_mtx); 80783043Sbrooks break; 80863670Snsayer 80963861Snsayer case SIOCSIFADDR: /* set MAC address of the remote side */ 810127165Srwatson mtx_lock(&tp->tap_mtx); 81163861Snsayer bcopy(data, tp->ether_addr, sizeof(tp->ether_addr)); 812127165Srwatson mtx_unlock(&tp->tap_mtx); 81383043Sbrooks break; 81463670Snsayer 81563670Snsayer default: 81663670Snsayer return (ENOTTY); 81763670Snsayer } 81863670Snsayer return (0); 81963670Snsayer} /* tapioctl */ 82063670Snsayer 82163670Snsayer 82263670Snsayer/* 82363670Snsayer * tapread 82463670Snsayer * 82563670Snsayer * the cdevsw read interface - reads a packet at a time, or at 82663670Snsayer * least as much of a packet as can be read 82763670Snsayer */ 82863670Snsayerstatic int 829156783Semaxtapread(struct cdev *dev, struct uio *uio, int flag) 83063670Snsayer{ 83163670Snsayer struct tap_softc *tp = dev->si_drv1; 832147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 83390227Sdillon struct mbuf *m = NULL; 834213028Sjhb int error = 0, len; 83563670Snsayer 836183397Sed TAPDEBUG("%s reading, minor = %#x\n", ifp->if_xname, dev2unit(dev)); 83763670Snsayer 838127098Srwatson mtx_lock(&tp->tap_mtx); 83963670Snsayer if ((tp->tap_flags & TAP_READY) != TAP_READY) { 840127098Srwatson mtx_unlock(&tp->tap_mtx); 841127098Srwatson 842127098Srwatson /* Unlocked read. */ 843121816Sbrooks TAPDEBUG("%s not ready. minor = %#x, tap_flags = 0x%x\n", 844183397Sed ifp->if_xname, dev2unit(dev), tp->tap_flags); 84563803Snsayer 84663670Snsayer return (EHOSTDOWN); 84763670Snsayer } 84863670Snsayer 84963670Snsayer tp->tap_flags &= ~TAP_RWAIT; 85063670Snsayer 85163670Snsayer /* sleep until we get a packet */ 85263670Snsayer do { 85390227Sdillon IF_DEQUEUE(&ifp->if_snd, m); 85463670Snsayer 85590227Sdillon if (m == NULL) { 856213028Sjhb if (flag & O_NONBLOCK) { 857213028Sjhb mtx_unlock(&tp->tap_mtx); 85863670Snsayer return (EWOULDBLOCK); 859213028Sjhb } 860111742Sdes 86163670Snsayer tp->tap_flags |= TAP_RWAIT; 862213028Sjhb error = mtx_sleep(tp, &tp->tap_mtx, PCATCH | (PZERO + 1), 863213028Sjhb "taprd", 0); 864213028Sjhb if (error) { 865213028Sjhb mtx_unlock(&tp->tap_mtx); 86663670Snsayer return (error); 867213028Sjhb } 86863670Snsayer } 86990227Sdillon } while (m == NULL); 870213028Sjhb mtx_unlock(&tp->tap_mtx); 87163670Snsayer 87263670Snsayer /* feed packet to bpf */ 873106939Ssam BPF_MTAP(ifp, m); 87463670Snsayer 87563670Snsayer /* xfer packet to user space */ 87690227Sdillon while ((m != NULL) && (uio->uio_resid > 0) && (error == 0)) { 87790227Sdillon len = min(uio->uio_resid, m->m_len); 87863670Snsayer if (len == 0) 87963670Snsayer break; 88063670Snsayer 881111741Sdes error = uiomove(mtod(m, void *), len, uio); 88290227Sdillon m = m_free(m); 88363670Snsayer } 88463670Snsayer 88590227Sdillon if (m != NULL) { 886121816Sbrooks TAPDEBUG("%s dropping mbuf, minor = %#x\n", ifp->if_xname, 887183397Sed dev2unit(dev)); 88890227Sdillon m_freem(m); 88963670Snsayer } 89063670Snsayer 89163670Snsayer return (error); 89263670Snsayer} /* tapread */ 89363670Snsayer 89463670Snsayer 89563670Snsayer/* 89663670Snsayer * tapwrite 89763670Snsayer * 89863670Snsayer * the cdevsw write interface - an atomic write is a packet - or else! 89963670Snsayer */ 90063670Snsayerstatic int 901156783Semaxtapwrite(struct cdev *dev, struct uio *uio, int flag) 90263670Snsayer{ 903166443Sbms struct ether_header *eh; 90463670Snsayer struct tap_softc *tp = dev->si_drv1; 905147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 906137101Sglebius struct mbuf *m; 90763670Snsayer 908121816Sbrooks TAPDEBUG("%s writting, minor = %#x\n", 909183397Sed ifp->if_xname, dev2unit(dev)); 91063670Snsayer 91163670Snsayer if (uio->uio_resid == 0) 91263670Snsayer return (0); 91363670Snsayer 91463670Snsayer if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) { 915194990Skib TAPDEBUG("%s invalid packet len = %zd, minor = %#x\n", 916183397Sed ifp->if_xname, uio->uio_resid, dev2unit(dev)); 91763803Snsayer 91863670Snsayer return (EIO); 91963670Snsayer } 92063670Snsayer 921163915Sandre if ((m = m_uiotombuf(uio, M_DONTWAIT, 0, ETHER_ALIGN, 922163915Sandre M_PKTHDR)) == NULL) { 92363670Snsayer ifp->if_ierrors ++; 924163986Scsjp return (ENOBUFS); 92563670Snsayer } 92663670Snsayer 927137101Sglebius m->m_pkthdr.rcvif = ifp; 928111742Sdes 929166443Sbms /* 930166443Sbms * Only pass a unicast frame to ether_input(), if it would actually 931166443Sbms * have been received by non-virtual hardware. 932166443Sbms */ 933166443Sbms if (m->m_len < sizeof(struct ether_header)) { 934166443Sbms m_freem(m); 935166443Sbms return (0); 936166443Sbms } 937166443Sbms eh = mtod(m, struct ether_header *); 938166443Sbms 939166443Sbms if (eh && (ifp->if_flags & IFF_PROMISC) == 0 && 940166443Sbms !ETHER_IS_MULTICAST(eh->ether_dhost) && 941166443Sbms bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) { 942166443Sbms m_freem(m); 943166443Sbms return (0); 944166443Sbms } 945166443Sbms 946106939Ssam /* Pass packet up to parent. */ 947137101Sglebius (*ifp->if_input)(ifp, m); 948106939Ssam ifp->if_ipackets ++; /* ibytes are counted in parent */ 94963670Snsayer 95063670Snsayer return (0); 95163670Snsayer} /* tapwrite */ 95263670Snsayer 95363670Snsayer 95463670Snsayer/* 95563670Snsayer * tappoll 95663670Snsayer * 95763670Snsayer * the poll interface, this is only useful on reads 95863670Snsayer * really. the write detect always returns true, write never blocks 95963670Snsayer * anyway, it either accepts the packet or drops it 96063670Snsayer */ 96163670Snsayerstatic int 962156783Semaxtappoll(struct cdev *dev, int events, struct thread *td) 96363670Snsayer{ 96463670Snsayer struct tap_softc *tp = dev->si_drv1; 965147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 966213028Sjhb int revents = 0; 96763670Snsayer 968121816Sbrooks TAPDEBUG("%s polling, minor = %#x\n", 969183397Sed ifp->if_xname, dev2unit(dev)); 97063670Snsayer 97163670Snsayer if (events & (POLLIN | POLLRDNORM)) { 972213028Sjhb IFQ_LOCK(&ifp->if_snd); 973213028Sjhb if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 974121816Sbrooks TAPDEBUG("%s have data in queue. len = %d, " \ 975121816Sbrooks "minor = %#x\n", ifp->if_xname, 976183397Sed ifp->if_snd.ifq_len, dev2unit(dev)); 97763803Snsayer 97863670Snsayer revents |= (events & (POLLIN | POLLRDNORM)); 97983043Sbrooks } else { 980121816Sbrooks TAPDEBUG("%s waiting for data, minor = %#x\n", 981183397Sed ifp->if_xname, dev2unit(dev)); 98263803Snsayer 98383805Sjhb selrecord(td, &tp->tap_rsel); 98463670Snsayer } 985213028Sjhb IFQ_UNLOCK(&ifp->if_snd); 98663670Snsayer } 98763670Snsayer 98863670Snsayer if (events & (POLLOUT | POLLWRNORM)) 98963670Snsayer revents |= (events & (POLLOUT | POLLWRNORM)); 99063670Snsayer 99163670Snsayer return (revents); 99263670Snsayer} /* tappoll */ 993156783Semax 994156783Semax 995156783Semax/* 996156783Semax * tap_kqfilter 997156783Semax * 998156783Semax * support for kevent() system call 999156783Semax */ 1000156783Semaxstatic int 1001156783Semaxtapkqfilter(struct cdev *dev, struct knote *kn) 1002156783Semax{ 1003156783Semax struct tap_softc *tp = dev->si_drv1; 1004156783Semax struct ifnet *ifp = tp->tap_ifp; 1005156783Semax 1006156783Semax switch (kn->kn_filter) { 1007156783Semax case EVFILT_READ: 1008156783Semax TAPDEBUG("%s kqfilter: EVFILT_READ, minor = %#x\n", 1009183397Sed ifp->if_xname, dev2unit(dev)); 1010156783Semax kn->kn_fop = &tap_read_filterops; 1011156783Semax break; 1012156783Semax 1013156783Semax case EVFILT_WRITE: 1014156783Semax TAPDEBUG("%s kqfilter: EVFILT_WRITE, minor = %#x\n", 1015183397Sed ifp->if_xname, dev2unit(dev)); 1016156783Semax kn->kn_fop = &tap_write_filterops; 1017156783Semax break; 1018156783Semax 1019156783Semax default: 1020156783Semax TAPDEBUG("%s kqfilter: invalid filter, minor = %#x\n", 1021183397Sed ifp->if_xname, dev2unit(dev)); 1022156783Semax return (EINVAL); 1023156783Semax /* NOT REACHED */ 1024156783Semax } 1025156783Semax 1026213028Sjhb kn->kn_hook = tp; 1027156783Semax knlist_add(&tp->tap_rsel.si_note, kn, 0); 1028156783Semax 1029156783Semax return (0); 1030156783Semax} /* tapkqfilter */ 1031156783Semax 1032156783Semax 1033156783Semax/* 1034156783Semax * tap_kqread 1035156783Semax * 1036156783Semax * Return true if there is data in the interface queue 1037156783Semax */ 1038156783Semaxstatic int 1039156783Semaxtapkqread(struct knote *kn, long hint) 1040156783Semax{ 1041213028Sjhb int ret; 1042213028Sjhb struct tap_softc *tp = kn->kn_hook; 1043213028Sjhb struct cdev *dev = tp->tap_dev; 1044156783Semax struct ifnet *ifp = tp->tap_ifp; 1045156783Semax 1046156783Semax if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) { 1047156783Semax TAPDEBUG("%s have data in queue. len = %d, minor = %#x\n", 1048183397Sed ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev)); 1049156783Semax ret = 1; 1050156783Semax } else { 1051156783Semax TAPDEBUG("%s waiting for data, minor = %#x\n", 1052183397Sed ifp->if_xname, dev2unit(dev)); 1053156783Semax ret = 0; 1054156783Semax } 1055156783Semax 1056156783Semax return (ret); 1057156783Semax} /* tapkqread */ 1058156783Semax 1059156783Semax 1060156783Semax/* 1061156783Semax * tap_kqwrite 1062156783Semax * 1063156783Semax * Always can write. Return the MTU in kn->data 1064156783Semax */ 1065156783Semaxstatic int 1066156783Semaxtapkqwrite(struct knote *kn, long hint) 1067156783Semax{ 1068213028Sjhb struct tap_softc *tp = kn->kn_hook; 1069156783Semax struct ifnet *ifp = tp->tap_ifp; 1070156783Semax 1071156783Semax kn->kn_data = ifp->if_mtu; 1072156783Semax 1073156783Semax return (1); 1074156783Semax} /* tapkqwrite */ 1075156783Semax 1076156783Semax 1077156783Semaxstatic void 1078156783Semaxtapkqdetach(struct knote *kn) 1079156783Semax{ 1080213028Sjhb struct tap_softc *tp = kn->kn_hook; 1081156783Semax 1082156783Semax knlist_remove(&tp->tap_rsel.si_note, kn, 0); 1083156783Semax} /* tapkqdetach */ 1084156783Semax 1085