if_tap.c revision 257696
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 257696 2013-11-05 10:29:47Z glebius $ 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> 45236724Strociny#include <sys/jail.h> 4663670Snsayer#include <sys/kernel.h> 4763670Snsayer#include <sys/malloc.h> 4863670Snsayer#include <sys/mbuf.h> 49129880Sphk#include <sys/module.h> 5063670Snsayer#include <sys/poll.h> 51164033Srwatson#include <sys/priv.h> 5263670Snsayer#include <sys/proc.h> 53139207Sphk#include <sys/selinfo.h> 5463670Snsayer#include <sys/signalvar.h> 5563670Snsayer#include <sys/socket.h> 5663670Snsayer#include <sys/sockio.h> 5763670Snsayer#include <sys/sysctl.h> 5863670Snsayer#include <sys/systm.h> 5963670Snsayer#include <sys/ttycom.h> 6063670Snsayer#include <sys/uio.h> 6183043Sbrooks#include <sys/queue.h> 6263670Snsayer 6363670Snsayer#include <net/bpf.h> 6463670Snsayer#include <net/ethernet.h> 6563670Snsayer#include <net/if.h> 66257176Sglebius#include <net/if_var.h> 67166497Sbms#include <net/if_clone.h> 68152315Sru#include <net/if_dl.h> 69238183Semaste#include <net/if_media.h> 70236725Strociny#include <net/if_types.h> 7163670Snsayer#include <net/route.h> 72236724Strociny#include <net/vnet.h> 7363670Snsayer 7463670Snsayer#include <netinet/in.h> 7563670Snsayer 7663670Snsayer#include <net/if_tapvar.h> 7763670Snsayer#include <net/if_tap.h> 7863670Snsayer 7963670Snsayer 8063670Snsayer#define CDEV_NAME "tap" 8163670Snsayer#define TAPDEBUG if (tapdebug) printf 8263670Snsayer 83241610Sglebiusstatic const char tapname[] = "tap"; 84241610Sglebiusstatic const char vmnetname[] = "vmnet"; 8583043Sbrooks#define TAPMAXUNIT 0x7fff 86126077Sphk#define VMNET_DEV_MASK CLONE_FLAG0 8763670Snsayer 8863670Snsayer/* module */ 89111742Sdesstatic int tapmodevent(module_t, int, void *); 9063670Snsayer 9163670Snsayer/* device */ 92148868Srwatsonstatic void tapclone(void *, struct ucred *, char *, int, 93148868Srwatson struct cdev **); 94130585Sphkstatic void tapcreate(struct cdev *); 9563670Snsayer 9663670Snsayer/* network interface */ 9793084Sbdestatic void tapifstart(struct ifnet *); 9893084Sbdestatic int tapifioctl(struct ifnet *, u_long, caddr_t); 9993084Sbdestatic void tapifinit(void *); 10063670Snsayer 101166497Sbmsstatic int tap_clone_create(struct if_clone *, int, caddr_t); 102166497Sbmsstatic void tap_clone_destroy(struct ifnet *); 103241610Sglebiusstatic struct if_clone *tap_cloner; 104166497Sbmsstatic int vmnet_clone_create(struct if_clone *, int, caddr_t); 105166497Sbmsstatic void vmnet_clone_destroy(struct ifnet *); 106241610Sglebiusstatic struct if_clone *vmnet_cloner; 107166497Sbms 10863670Snsayer/* character device */ 10963670Snsayerstatic d_open_t tapopen; 11063670Snsayerstatic d_close_t tapclose; 11163670Snsayerstatic d_read_t tapread; 11263670Snsayerstatic d_write_t tapwrite; 11363670Snsayerstatic d_ioctl_t tapioctl; 11463670Snsayerstatic d_poll_t tappoll; 115156783Semaxstatic d_kqfilter_t tapkqfilter; 11663670Snsayer 117156783Semax/* kqueue(2) */ 118156783Semaxstatic int tapkqread(struct knote *, long); 119156783Semaxstatic int tapkqwrite(struct knote *, long); 120156783Semaxstatic void tapkqdetach(struct knote *); 121156783Semax 122156783Semaxstatic struct filterops tap_read_filterops = { 123156783Semax .f_isfd = 1, 124156783Semax .f_attach = NULL, 125156783Semax .f_detach = tapkqdetach, 126156783Semax .f_event = tapkqread, 127156783Semax}; 128156783Semax 129156783Semaxstatic struct filterops tap_write_filterops = { 130156783Semax .f_isfd = 1, 131156783Semax .f_attach = NULL, 132156783Semax .f_detach = tapkqdetach, 133156783Semax .f_event = tapkqwrite, 134156783Semax}; 135156783Semax 13663670Snsayerstatic struct cdevsw tap_cdevsw = { 137126080Sphk .d_version = D_VERSION, 138226500Sed .d_flags = D_NEEDMINOR, 139111815Sphk .d_open = tapopen, 140111815Sphk .d_close = tapclose, 141111815Sphk .d_read = tapread, 142111815Sphk .d_write = tapwrite, 143111815Sphk .d_ioctl = tapioctl, 144111815Sphk .d_poll = tappoll, 145111815Sphk .d_name = CDEV_NAME, 146156783Semax .d_kqfilter = tapkqfilter, 14763670Snsayer}; 14863670Snsayer 149127003Srwatson/* 150127003Srwatson * All global variables in if_tap.c are locked with tapmtx, with the 151127003Srwatson * exception of tapdebug, which is accessed unlocked; tapclones is 152127003Srwatson * static at runtime. 153127003Srwatson */ 154127003Srwatsonstatic struct mtx tapmtx; 15583043Sbrooksstatic int tapdebug = 0; /* debug flag */ 156167713Sbmsstatic int tapuopen = 0; /* allow user open() */ 157167713Sbmsstatic int tapuponopen = 0; /* IFF_UP on open() */ 158166497Sbmsstatic int tapdclone = 1; /* enable devfs cloning */ 15983043Sbrooksstatic SLIST_HEAD(, tap_softc) taphead; /* first device */ 160126077Sphkstatic struct clonedevs *tapclones; 16163670Snsayer 16263670SnsayerMALLOC_DECLARE(M_TAP); 16363670SnsayerMALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface"); 16463670SnsayerSYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, ""); 165144979Smdodd 166144979SmdoddSYSCTL_DECL(_net_link); 167227309Sedstatic SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0, 168144979Smdodd "Ethernet tunnel software network interface"); 169144979SmdoddSYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0, 170144979Smdodd "Allow user to open /dev/tap (based on node permissions)"); 171167713SbmsSYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0, 172167713Sbms "Bring interface up when /dev/tap is opened"); 173166497SbmsSYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RW, &tapdclone, 0, 174166497Sbms "Enably legacy devfs interface creation"); 175144979SmdoddSYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, ""); 176144979Smdodd 177166497SbmsTUNABLE_INT("net.link.tap.devfs_cloning", &tapdclone); 178166497Sbms 17963670SnsayerDEV_MODULE(if_tap, tapmodevent, NULL); 18063670Snsayer 181166497Sbmsstatic int 182166497Sbmstap_clone_create(struct if_clone *ifc, int unit, caddr_t params) 183166497Sbms{ 184166497Sbms struct cdev *dev; 185166497Sbms int i; 186166497Sbms 187241610Sglebius /* Find any existing device, or allocate new unit number. */ 188241610Sglebius i = clone_create(&tapclones, &tap_cdevsw, &unit, &dev, 0); 189166497Sbms if (i) { 190243615Sdavidxu dev = make_dev(&tap_cdevsw, unit, UID_ROOT, GID_WHEEL, 0600, 191241610Sglebius "%s%d", tapname, unit); 192166497Sbms } 193166497Sbms 194166497Sbms tapcreate(dev); 195166497Sbms return (0); 196166497Sbms} 197166497Sbms 198166497Sbms/* vmnet devices are tap devices in disguise */ 199166497Sbmsstatic int 200166497Sbmsvmnet_clone_create(struct if_clone *ifc, int unit, caddr_t params) 201166497Sbms{ 202241610Sglebius struct cdev *dev; 203241610Sglebius int i; 204241610Sglebius 205241610Sglebius /* Find any existing device, or allocate new unit number. */ 206241610Sglebius i = clone_create(&tapclones, &tap_cdevsw, &unit, &dev, VMNET_DEV_MASK); 207241610Sglebius if (i) { 208241610Sglebius dev = make_dev(&tap_cdevsw, unit | VMNET_DEV_MASK, UID_ROOT, 209257078Sgrehan GID_WHEEL, 0600, "%s%d", vmnetname, unit); 210241610Sglebius } 211241610Sglebius 212241610Sglebius tapcreate(dev); 213241610Sglebius return (0); 214166497Sbms} 215166497Sbms 216166497Sbmsstatic void 217166497Sbmstap_destroy(struct tap_softc *tp) 218166497Sbms{ 219166497Sbms struct ifnet *ifp = tp->tap_ifp; 220166497Sbms 221236724Strociny CURVNET_SET(ifp->if_vnet); 222240938Semaste destroy_dev(tp->tap_dev); 223225177Sattilio seldrain(&tp->tap_rsel); 224256008Sglebius knlist_clear(&tp->tap_rsel.si_note, 0); 225166497Sbms knlist_destroy(&tp->tap_rsel.si_note); 226166497Sbms ether_ifdetach(ifp); 227227459Sbrooks if_free(ifp); 228166497Sbms 229166497Sbms mtx_destroy(&tp->tap_mtx); 230166497Sbms free(tp, M_TAP); 231236724Strociny CURVNET_RESTORE(); 232166497Sbms} 233166497Sbms 234166497Sbmsstatic void 235166497Sbmstap_clone_destroy(struct ifnet *ifp) 236166497Sbms{ 237166497Sbms struct tap_softc *tp = ifp->if_softc; 238166497Sbms 239166497Sbms mtx_lock(&tapmtx); 240166497Sbms SLIST_REMOVE(&taphead, tp, tap_softc, tap_next); 241166497Sbms mtx_unlock(&tapmtx); 242166497Sbms tap_destroy(tp); 243166497Sbms} 244166497Sbms 245166497Sbms/* vmnet devices are tap devices in disguise */ 246166497Sbmsstatic void 247166497Sbmsvmnet_clone_destroy(struct ifnet *ifp) 248166497Sbms{ 249166497Sbms tap_clone_destroy(ifp); 250166497Sbms} 251166497Sbms 25263670Snsayer/* 25363670Snsayer * tapmodevent 25463670Snsayer * 25563670Snsayer * module event handler 25663670Snsayer */ 25763670Snsayerstatic int 258156783Semaxtapmodevent(module_t mod, int type, void *data) 25963670Snsayer{ 26083043Sbrooks static eventhandler_tag eh_tag = NULL; 26183043Sbrooks struct tap_softc *tp = NULL; 26283043Sbrooks struct ifnet *ifp = NULL; 26363670Snsayer 26463670Snsayer switch (type) { 26563670Snsayer case MOD_LOAD: 26663670Snsayer 26783043Sbrooks /* intitialize device */ 26883043Sbrooks 269127003Srwatson mtx_init(&tapmtx, "tapmtx", NULL, MTX_DEF); 27083043Sbrooks SLIST_INIT(&taphead); 27183043Sbrooks 272126845Sphk clone_setup(&tapclones); 27371602Sphk eh_tag = EVENTHANDLER_REGISTER(dev_clone, tapclone, 0, 1000); 274127003Srwatson if (eh_tag == NULL) { 275127170Srwatson clone_cleanup(&tapclones); 276127003Srwatson mtx_destroy(&tapmtx); 277126077Sphk return (ENOMEM); 278127003Srwatson } 279241610Sglebius tap_cloner = if_clone_simple(tapname, tap_clone_create, 280241610Sglebius tap_clone_destroy, 0); 281241610Sglebius vmnet_cloner = if_clone_simple(vmnetname, vmnet_clone_create, 282241610Sglebius vmnet_clone_destroy, 0); 28383043Sbrooks return (0); 28463670Snsayer 28583043Sbrooks case MOD_UNLOAD: 286127003Srwatson /* 287127003Srwatson * The EBUSY algorithm here can't quite atomically 288127003Srwatson * guarantee that this is race-free since we have to 289127003Srwatson * release the tap mtx to deregister the clone handler. 290127003Srwatson */ 291127003Srwatson mtx_lock(&tapmtx); 292127003Srwatson SLIST_FOREACH(tp, &taphead, tap_next) { 293127098Srwatson mtx_lock(&tp->tap_mtx); 294127003Srwatson if (tp->tap_flags & TAP_OPEN) { 295127098Srwatson mtx_unlock(&tp->tap_mtx); 296127003Srwatson mtx_unlock(&tapmtx); 29783043Sbrooks return (EBUSY); 298127003Srwatson } 299127098Srwatson mtx_unlock(&tp->tap_mtx); 300127003Srwatson } 301127003Srwatson mtx_unlock(&tapmtx); 30283043Sbrooks 30371602Sphk EVENTHANDLER_DEREGISTER(dev_clone, eh_tag); 304241610Sglebius if_clone_detach(tap_cloner); 305241610Sglebius if_clone_detach(vmnet_cloner); 306204464Skib drain_dev_clone_events(); 30763670Snsayer 308127003Srwatson mtx_lock(&tapmtx); 30983043Sbrooks while ((tp = SLIST_FIRST(&taphead)) != NULL) { 31083043Sbrooks SLIST_REMOVE_HEAD(&taphead, tap_next); 311127003Srwatson mtx_unlock(&tapmtx); 31283043Sbrooks 313147256Sbrooks ifp = tp->tap_ifp; 31483043Sbrooks 315121816Sbrooks TAPDEBUG("detaching %s\n", ifp->if_xname); 31683043Sbrooks 317166497Sbms tap_destroy(tp); 318127003Srwatson mtx_lock(&tapmtx); 31983043Sbrooks } 320127003Srwatson mtx_unlock(&tapmtx); 321126077Sphk clone_cleanup(&tapclones); 32263670Snsayer 323135354Srwatson mtx_destroy(&tapmtx); 324135354Srwatson 32583043Sbrooks break; 32663670Snsayer 32763670Snsayer default: 32863670Snsayer return (EOPNOTSUPP); 32963670Snsayer } 33063670Snsayer 33163670Snsayer return (0); 33263670Snsayer} /* tapmodevent */ 33363670Snsayer 33463670Snsayer 33563670Snsayer/* 33671602Sphk * DEVFS handler 33771602Sphk * 33871602Sphk * We need to support two kind of devices - tap and vmnet 33971602Sphk */ 34071602Sphkstatic void 341156783Semaxtapclone(void *arg, struct ucred *cred, char *name, int namelen, struct cdev **dev) 34271602Sphk{ 343166497Sbms char devname[SPECNAMELEN + 1]; 344166497Sbms int i, unit, append_unit; 345166438Sbms int extra; 34671602Sphk 347130640Sphk if (*dev != NULL) 34871602Sphk return; 34971602Sphk 350166514Sbms if (!tapdclone || 351166514Sbms (!tapuopen && priv_check_cred(cred, PRIV_NET_IFCREATE, 0) != 0)) 352166497Sbms return; 353166497Sbms 354166497Sbms unit = 0; 355166497Sbms append_unit = 0; 356126077Sphk extra = 0; 357166497Sbms 358166497Sbms /* We're interested in only tap/vmnet devices. */ 359241610Sglebius if (strcmp(name, tapname) == 0) { 360126077Sphk unit = -1; 361241610Sglebius } else if (strcmp(name, vmnetname) == 0) { 362126077Sphk unit = -1; 363126077Sphk extra = VMNET_DEV_MASK; 364241610Sglebius } else if (dev_stdclone(name, NULL, tapname, &unit) != 1) { 365241610Sglebius if (dev_stdclone(name, NULL, vmnetname, &unit) != 1) { 366126077Sphk return; 367166497Sbms } else { 368166497Sbms extra = VMNET_DEV_MASK; 369166497Sbms } 37083043Sbrooks } 37171602Sphk 372166497Sbms if (unit == -1) 373166497Sbms append_unit = 1; 374166497Sbms 375236724Strociny CURVNET_SET(CRED_TO_VNET(cred)); 376126077Sphk /* find any existing device, or allocate new unit number */ 377126077Sphk i = clone_create(&tapclones, &tap_cdevsw, &unit, dev, extra); 378126077Sphk if (i) { 379166497Sbms if (append_unit) { 380166497Sbms /* 381166497Sbms * We were passed 'tun' or 'tap', with no unit specified 382166497Sbms * so we'll need to append it now. 383166497Sbms */ 384166497Sbms namelen = snprintf(devname, sizeof(devname), "%s%d", name, 385166497Sbms unit); 386166497Sbms name = devname; 387166497Sbms } 388166497Sbms 389204464Skib *dev = make_dev_credf(MAKEDEV_REF, &tap_cdevsw, unit | extra, 390204464Skib cred, UID_ROOT, GID_WHEEL, 0600, "%s", name); 39171602Sphk } 392166497Sbms 393166497Sbms if_clone_create(name, namelen, NULL); 394236724Strociny CURVNET_RESTORE(); 39571602Sphk} /* tapclone */ 39671602Sphk 39771602Sphk 39871602Sphk/* 39963670Snsayer * tapcreate 40063670Snsayer * 40163670Snsayer * to create interface 40263670Snsayer */ 40363670Snsayerstatic void 404156783Semaxtapcreate(struct cdev *dev) 40563670Snsayer{ 40663670Snsayer struct ifnet *ifp = NULL; 40763670Snsayer struct tap_softc *tp = NULL; 40863670Snsayer unsigned short macaddr_hi; 409178221Semax uint32_t macaddr_mid; 410213028Sjhb int unit; 411241610Sglebius const char *name = NULL; 412147256Sbrooks u_char eaddr[6]; 41363670Snsayer 41463670Snsayer /* allocate driver storage and create device */ 415184205Sdes tp = malloc(sizeof(*tp), M_TAP, M_WAITOK | M_ZERO); 416127098Srwatson mtx_init(&tp->tap_mtx, "tap_mtx", NULL, MTX_DEF); 417127003Srwatson mtx_lock(&tapmtx); 41883043Sbrooks SLIST_INSERT_HEAD(&taphead, tp, tap_next); 419127003Srwatson mtx_unlock(&tapmtx); 42063670Snsayer 421126796Sphk unit = dev2unit(dev); 42283043Sbrooks 42363670Snsayer /* select device: tap or vmnet */ 424126796Sphk if (unit & VMNET_DEV_MASK) { 425241610Sglebius name = vmnetname; 42663803Snsayer tp->tap_flags |= TAP_VMNET; 42783043Sbrooks } else 428241610Sglebius name = tapname; 42963670Snsayer 430126796Sphk unit &= TAPMAXUNIT; 431126796Sphk 432183397Sed TAPDEBUG("tapcreate(%s%d). minor = %#x\n", name, unit, dev2unit(dev)); 43383043Sbrooks 43463670Snsayer /* generate fake MAC address: 00 bd xx xx xx unit_no */ 43563670Snsayer macaddr_hi = htons(0x00bd); 436178221Semax macaddr_mid = (uint32_t) ticks; 437147256Sbrooks bcopy(&macaddr_hi, eaddr, sizeof(short)); 438178221Semax bcopy(&macaddr_mid, &eaddr[2], sizeof(uint32_t)); 439147256Sbrooks eaddr[5] = (u_char)unit; 44063670Snsayer 441111742Sdes /* fill the rest and attach interface */ 442147256Sbrooks ifp = tp->tap_ifp = if_alloc(IFT_ETHER); 443147256Sbrooks if (ifp == NULL) 444147256Sbrooks panic("%s%d: can not if_alloc()", name, unit); 44563670Snsayer ifp->if_softc = tp; 446121816Sbrooks if_initname(ifp, name, unit); 44763670Snsayer ifp->if_init = tapifinit; 44863670Snsayer ifp->if_start = tapifstart; 44963670Snsayer ifp->if_ioctl = tapifioctl; 45063670Snsayer ifp->if_mtu = ETHERMTU; 45163670Snsayer ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST); 452213028Sjhb IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 453205222Sqingli ifp->if_capabilities |= IFCAP_LINKSTATE; 454205222Sqingli ifp->if_capenable |= IFCAP_LINKSTATE; 45563670Snsayer 45683043Sbrooks dev->si_drv1 = tp; 457126077Sphk tp->tap_dev = dev; 45883043Sbrooks 459147256Sbrooks ether_ifattach(ifp, eaddr); 46063670Snsayer 461127098Srwatson mtx_lock(&tp->tap_mtx); 46263803Snsayer tp->tap_flags |= TAP_INITED; 463127098Srwatson mtx_unlock(&tp->tap_mtx); 46463803Snsayer 465213028Sjhb knlist_init_mtx(&tp->tap_rsel.si_note, &tp->tap_mtx); 466158697Semax 467121816Sbrooks TAPDEBUG("interface %s is created. minor = %#x\n", 468183397Sed ifp->if_xname, dev2unit(dev)); 46963670Snsayer} /* tapcreate */ 47063670Snsayer 47163670Snsayer 47263670Snsayer/* 473111742Sdes * tapopen 47463670Snsayer * 47563670Snsayer * to open tunnel. must be superuser 47663670Snsayer */ 47763670Snsayerstatic int 478156783Semaxtapopen(struct cdev *dev, int flag, int mode, struct thread *td) 47963670Snsayer{ 48063670Snsayer struct tap_softc *tp = NULL; 481133460Semax struct ifnet *ifp = NULL; 482213028Sjhb int error; 48363670Snsayer 484164033Srwatson if (tapuopen == 0) { 485164033Srwatson error = priv_check(td, PRIV_NET_TAP); 486164033Srwatson if (error) 487164033Srwatson return (error); 488164033Srwatson } 48963670Snsayer 490126796Sphk if ((dev2unit(dev) & CLONE_UNITMASK) > TAPMAXUNIT) 491126796Sphk return (ENXIO); 49283043Sbrooks 49363670Snsayer tp = dev->si_drv1; 49463670Snsayer 495127165Srwatson mtx_lock(&tp->tap_mtx); 496127165Srwatson if (tp->tap_flags & TAP_OPEN) { 497127165Srwatson mtx_unlock(&tp->tap_mtx); 498127165Srwatson return (EBUSY); 499127165Srwatson } 50063670Snsayer 501152315Sru bcopy(IF_LLADDR(tp->tap_ifp), tp->ether_addr, sizeof(tp->ether_addr)); 50283366Sjulian tp->tap_pid = td->td_proc->p_pid; 50363670Snsayer tp->tap_flags |= TAP_OPEN; 504147256Sbrooks ifp = tp->tap_ifp; 50563670Snsayer 506148887Srwatson ifp->if_drv_flags |= IFF_DRV_RUNNING; 507148887Srwatson ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 508167713Sbms if (tapuponopen) 509167713Sbms ifp->if_flags |= IFF_UP; 510205024Sqingli if_link_state_change(ifp, LINK_STATE_UP); 511213028Sjhb mtx_unlock(&tp->tap_mtx); 51263670Snsayer 513183397Sed TAPDEBUG("%s is open. minor = %#x\n", ifp->if_xname, dev2unit(dev)); 514133460Semax 51563670Snsayer return (0); 51663670Snsayer} /* tapopen */ 51763670Snsayer 51863670Snsayer 51963670Snsayer/* 52063670Snsayer * tapclose 52163670Snsayer * 52263670Snsayer * close the device - mark i/f down & delete routing info 52363670Snsayer */ 52463670Snsayerstatic int 525156783Semaxtapclose(struct cdev *dev, int foo, int bar, struct thread *td) 52663670Snsayer{ 527156783Semax struct ifaddr *ifa; 52863670Snsayer struct tap_softc *tp = dev->si_drv1; 529147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 53063670Snsayer 53163670Snsayer /* junk all pending output */ 532213028Sjhb mtx_lock(&tp->tap_mtx); 533236724Strociny CURVNET_SET(ifp->if_vnet); 53483043Sbrooks IF_DRAIN(&ifp->if_snd); 53563670Snsayer 53663803Snsayer /* 53763803Snsayer * do not bring the interface down, and do not anything with 53863803Snsayer * interface, if we are in VMnet mode. just close the device. 53963803Snsayer */ 54063803Snsayer 54163803Snsayer if (((tp->tap_flags & TAP_VMNET) == 0) && (ifp->if_flags & IFF_UP)) { 542127098Srwatson mtx_unlock(&tp->tap_mtx); 54363670Snsayer if_down(ifp); 544213028Sjhb mtx_lock(&tp->tap_mtx); 545148887Srwatson if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 546213028Sjhb ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 547213028Sjhb mtx_unlock(&tp->tap_mtx); 54863803Snsayer TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 549146620Speadar rtinit(ifa, (int)RTM_DELETE, 0); 55063670Snsayer } 551146620Speadar if_purgeaddrs(ifp); 552213028Sjhb mtx_lock(&tp->tap_mtx); 55363670Snsayer } 554213028Sjhb } 55563670Snsayer 556205024Sqingli if_link_state_change(ifp, LINK_STATE_DOWN); 557236724Strociny CURVNET_RESTORE(); 558236724Strociny 55996122Salfred funsetown(&tp->tap_sigio); 560122352Stanimura selwakeuppri(&tp->tap_rsel, PZERO+1); 561213028Sjhb KNOTE_LOCKED(&tp->tap_rsel.si_note, 0); 56263670Snsayer 56363670Snsayer tp->tap_flags &= ~TAP_OPEN; 56463670Snsayer tp->tap_pid = 0; 565127098Srwatson mtx_unlock(&tp->tap_mtx); 56663670Snsayer 567121816Sbrooks TAPDEBUG("%s is closed. minor = %#x\n", 568183397Sed ifp->if_xname, dev2unit(dev)); 56963670Snsayer 57063670Snsayer return (0); 57163670Snsayer} /* tapclose */ 57263670Snsayer 57363670Snsayer 57463670Snsayer/* 57563670Snsayer * tapifinit 57663670Snsayer * 57763670Snsayer * network interface initialization function 57863670Snsayer */ 57963670Snsayerstatic void 580156783Semaxtapifinit(void *xtp) 58163670Snsayer{ 58263670Snsayer struct tap_softc *tp = (struct tap_softc *)xtp; 583147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 58463670Snsayer 585121816Sbrooks TAPDEBUG("initializing %s\n", ifp->if_xname); 58663670Snsayer 587213028Sjhb mtx_lock(&tp->tap_mtx); 588148887Srwatson ifp->if_drv_flags |= IFF_DRV_RUNNING; 589148887Srwatson ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 590213028Sjhb mtx_unlock(&tp->tap_mtx); 59163670Snsayer 59263670Snsayer /* attempt to start output */ 59363670Snsayer tapifstart(ifp); 59463670Snsayer} /* tapifinit */ 59563670Snsayer 59663670Snsayer 59763670Snsayer/* 59863670Snsayer * tapifioctl 59963670Snsayer * 60063670Snsayer * Process an ioctl request on network interface 60163670Snsayer */ 602105228Sphkstatic int 603156783Semaxtapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 60463670Snsayer{ 605160376Sbrooks struct tap_softc *tp = ifp->if_softc; 606189866Sscf struct ifreq *ifr = (struct ifreq *)data; 60763670Snsayer struct ifstat *ifs = NULL; 608238183Semaste struct ifmediareq *ifmr = NULL; 609238183Semaste int dummy, error = 0; 61063670Snsayer 61163670Snsayer switch (cmd) { 61263670Snsayer case SIOCSIFFLAGS: /* XXX -- just like vmnet does */ 61363670Snsayer case SIOCADDMULTI: 61463670Snsayer case SIOCDELMULTI: 61583043Sbrooks break; 61663670Snsayer 617238183Semaste case SIOCGIFMEDIA: 618238183Semaste ifmr = (struct ifmediareq *)data; 619238183Semaste dummy = ifmr->ifm_count; 620238183Semaste ifmr->ifm_count = 1; 621238183Semaste ifmr->ifm_status = IFM_AVALID; 622238183Semaste ifmr->ifm_active = IFM_ETHER; 623238183Semaste if (tp->tap_flags & TAP_OPEN) 624238183Semaste ifmr->ifm_status |= IFM_ACTIVE; 625238183Semaste ifmr->ifm_current = ifmr->ifm_active; 626238183Semaste if (dummy >= 1) { 627238183Semaste int media = IFM_ETHER; 628238183Semaste error = copyout(&media, ifmr->ifm_ulist, 629238183Semaste sizeof(int)); 630238183Semaste } 631238183Semaste break; 632238183Semaste 633189866Sscf case SIOCSIFMTU: 634189866Sscf ifp->if_mtu = ifr->ifr_mtu; 635189866Sscf break; 636189866Sscf 63763670Snsayer case SIOCGIFSTATUS: 63863670Snsayer ifs = (struct ifstat *)data; 63963670Snsayer dummy = strlen(ifs->ascii); 640127098Srwatson mtx_lock(&tp->tap_mtx); 64163670Snsayer if (tp->tap_pid != 0 && dummy < sizeof(ifs->ascii)) 64263670Snsayer snprintf(ifs->ascii + dummy, 64363670Snsayer sizeof(ifs->ascii) - dummy, 64463670Snsayer "\tOpened by PID %d\n", tp->tap_pid); 645127098Srwatson mtx_unlock(&tp->tap_mtx); 64683043Sbrooks break; 64763670Snsayer 64863670Snsayer default: 649238183Semaste error = ether_ioctl(ifp, cmd, data); 650238183Semaste break; 65163670Snsayer } 65263670Snsayer 653238183Semaste return (error); 65463670Snsayer} /* tapifioctl */ 65563670Snsayer 65663670Snsayer 65763670Snsayer/* 658111742Sdes * tapifstart 659111742Sdes * 66063670Snsayer * queue packets from higher level ready to put out 66163670Snsayer */ 66263670Snsayerstatic void 663156783Semaxtapifstart(struct ifnet *ifp) 66463670Snsayer{ 66563670Snsayer struct tap_softc *tp = ifp->if_softc; 66663670Snsayer 667121816Sbrooks TAPDEBUG("%s starting\n", ifp->if_xname); 66863670Snsayer 66963803Snsayer /* 67063803Snsayer * do not junk pending output if we are in VMnet mode. 67163803Snsayer * XXX: can this do any harm because of queue overflow? 67263803Snsayer */ 67363803Snsayer 674127098Srwatson mtx_lock(&tp->tap_mtx); 675111742Sdes if (((tp->tap_flags & TAP_VMNET) == 0) && 67663803Snsayer ((tp->tap_flags & TAP_READY) != TAP_READY)) { 677213028Sjhb struct mbuf *m; 67863670Snsayer 679127098Srwatson /* Unlocked read. */ 680121816Sbrooks TAPDEBUG("%s not ready, tap_flags = 0x%x\n", ifp->if_xname, 681121816Sbrooks tp->tap_flags); 68263670Snsayer 683213028Sjhb for (;;) { 68463670Snsayer IF_DEQUEUE(&ifp->if_snd, m); 685213028Sjhb if (m != NULL) { 68663670Snsayer m_freem(m); 687213028Sjhb ifp->if_oerrors++; 688213028Sjhb } else 689213028Sjhb break; 690213028Sjhb } 691213028Sjhb mtx_unlock(&tp->tap_mtx); 69263670Snsayer 69363670Snsayer return; 69463670Snsayer } 69563670Snsayer 696148887Srwatson ifp->if_drv_flags |= IFF_DRV_OACTIVE; 69763670Snsayer 698213028Sjhb if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 69963670Snsayer if (tp->tap_flags & TAP_RWAIT) { 70063670Snsayer tp->tap_flags &= ~TAP_RWAIT; 701111748Sdes wakeup(tp); 70263670Snsayer } 70363670Snsayer 704127098Srwatson if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) { 705127098Srwatson mtx_unlock(&tp->tap_mtx); 70695883Salfred pgsigio(&tp->tap_sigio, SIGIO, 0); 707213028Sjhb mtx_lock(&tp->tap_mtx); 708213028Sjhb } 70963670Snsayer 710122352Stanimura selwakeuppri(&tp->tap_rsel, PZERO+1); 711213028Sjhb KNOTE_LOCKED(&tp->tap_rsel.si_note, 0); 71263670Snsayer ifp->if_opackets ++; /* obytes are counted in ether_output */ 71363670Snsayer } 71463670Snsayer 715148887Srwatson ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 716213028Sjhb mtx_unlock(&tp->tap_mtx); 71763670Snsayer} /* tapifstart */ 71863670Snsayer 71963670Snsayer 72063670Snsayer/* 72163670Snsayer * tapioctl 72263670Snsayer * 72363670Snsayer * the cdevsw interface is now pretty minimal 72463670Snsayer */ 72563670Snsayerstatic int 726156783Semaxtapioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 72763670Snsayer{ 72863670Snsayer struct tap_softc *tp = dev->si_drv1; 729147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 730111742Sdes struct tapinfo *tapp = NULL; 731102052Ssobomax int f; 732162711Sru#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 733162711Sru defined(COMPAT_FREEBSD4) 734162711Sru int ival; 735162711Sru#endif 73663670Snsayer 73763670Snsayer switch (cmd) { 738111742Sdes case TAPSIFINFO: 739111742Sdes tapp = (struct tapinfo *)data; 740213028Sjhb mtx_lock(&tp->tap_mtx); 741111742Sdes ifp->if_mtu = tapp->mtu; 742111742Sdes ifp->if_type = tapp->type; 743111742Sdes ifp->if_baudrate = tapp->baudrate; 744213028Sjhb mtx_unlock(&tp->tap_mtx); 745111742Sdes break; 74663670Snsayer 747111742Sdes case TAPGIFINFO: 748111742Sdes tapp = (struct tapinfo *)data; 749213028Sjhb mtx_lock(&tp->tap_mtx); 750111742Sdes tapp->mtu = ifp->if_mtu; 751111742Sdes tapp->type = ifp->if_type; 752111742Sdes tapp->baudrate = ifp->if_baudrate; 753213028Sjhb mtx_unlock(&tp->tap_mtx); 754111742Sdes break; 75563670Snsayer 75663670Snsayer case TAPSDEBUG: 757159079Smarius tapdebug = *(int *)data; 75883043Sbrooks break; 75963670Snsayer 76063670Snsayer case TAPGDEBUG: 761159079Smarius *(int *)data = tapdebug; 76283043Sbrooks break; 76363670Snsayer 764182880Semax case TAPGIFNAME: { 765182880Semax struct ifreq *ifr = (struct ifreq *) data; 766182880Semax 767182880Semax strlcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ); 768182880Semax } break; 769182880Semax 77063670Snsayer case FIONBIO: 77183043Sbrooks break; 77263670Snsayer 77363670Snsayer case FIOASYNC: 774127098Srwatson mtx_lock(&tp->tap_mtx); 775159079Smarius if (*(int *)data) 77663670Snsayer tp->tap_flags |= TAP_ASYNC; 77763670Snsayer else 77863670Snsayer tp->tap_flags &= ~TAP_ASYNC; 779127098Srwatson mtx_unlock(&tp->tap_mtx); 78083043Sbrooks break; 78163670Snsayer 78263670Snsayer case FIONREAD: 783213028Sjhb if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 784213028Sjhb struct mbuf *mb; 78563670Snsayer 786213028Sjhb IFQ_LOCK(&ifp->if_snd); 787213028Sjhb IFQ_POLL_NOLOCK(&ifp->if_snd, mb); 788213028Sjhb for (*(int *)data = 0; mb != NULL; 789213028Sjhb mb = mb->m_next) 790159079Smarius *(int *)data += mb->m_len; 791213028Sjhb IFQ_UNLOCK(&ifp->if_snd); 79283043Sbrooks } else 793159079Smarius *(int *)data = 0; 79483043Sbrooks break; 79563670Snsayer 79663670Snsayer case FIOSETOWN: 797159079Smarius return (fsetown(*(int *)data, &tp->tap_sigio)); 79863670Snsayer 79963670Snsayer case FIOGETOWN: 800159079Smarius *(int *)data = fgetown(&tp->tap_sigio); 80163670Snsayer return (0); 80263670Snsayer 80363670Snsayer /* this is deprecated, FIOSETOWN should be used instead */ 80463670Snsayer case TIOCSPGRP: 805159079Smarius return (fsetown(-(*(int *)data), &tp->tap_sigio)); 80663670Snsayer 80763670Snsayer /* this is deprecated, FIOGETOWN should be used instead */ 80863670Snsayer case TIOCGPGRP: 809159079Smarius *(int *)data = -fgetown(&tp->tap_sigio); 81063670Snsayer return (0); 81163670Snsayer 81263670Snsayer /* VMware/VMnet port ioctl's */ 81363670Snsayer 814162711Sru#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 815162711Sru defined(COMPAT_FREEBSD4) 816162711Sru case _IO('V', 0): 817162711Sru ival = IOCPARM_IVAL(data); 818162711Sru data = (caddr_t)&ival; 819162711Sru /* FALLTHROUGH */ 820162711Sru#endif 82183043Sbrooks case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 822162711Sru f = *(int *)data; 82363670Snsayer f &= 0x0fff; 82463670Snsayer f &= ~IFF_CANTCHANGE; 82563670Snsayer f |= IFF_UP; 82663670Snsayer 827213028Sjhb mtx_lock(&tp->tap_mtx); 82863670Snsayer ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE); 829213028Sjhb mtx_unlock(&tp->tap_mtx); 83083043Sbrooks break; 83163670Snsayer 832257696Sglebius case SIOCGIFADDR: /* get MAC address of the remote side */ 833127165Srwatson mtx_lock(&tp->tap_mtx); 83463861Snsayer bcopy(tp->ether_addr, data, sizeof(tp->ether_addr)); 835127165Srwatson mtx_unlock(&tp->tap_mtx); 83683043Sbrooks break; 83763670Snsayer 83863861Snsayer case SIOCSIFADDR: /* set MAC address of the remote side */ 839127165Srwatson mtx_lock(&tp->tap_mtx); 84063861Snsayer bcopy(data, tp->ether_addr, sizeof(tp->ether_addr)); 841127165Srwatson mtx_unlock(&tp->tap_mtx); 84283043Sbrooks break; 84363670Snsayer 84463670Snsayer default: 84563670Snsayer return (ENOTTY); 84663670Snsayer } 84763670Snsayer return (0); 84863670Snsayer} /* tapioctl */ 84963670Snsayer 85063670Snsayer 85163670Snsayer/* 85263670Snsayer * tapread 85363670Snsayer * 85463670Snsayer * the cdevsw read interface - reads a packet at a time, or at 85563670Snsayer * least as much of a packet as can be read 85663670Snsayer */ 85763670Snsayerstatic int 858156783Semaxtapread(struct cdev *dev, struct uio *uio, int flag) 85963670Snsayer{ 86063670Snsayer struct tap_softc *tp = dev->si_drv1; 861147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 86290227Sdillon struct mbuf *m = NULL; 863213028Sjhb int error = 0, len; 86463670Snsayer 865183397Sed TAPDEBUG("%s reading, minor = %#x\n", ifp->if_xname, dev2unit(dev)); 86663670Snsayer 867127098Srwatson mtx_lock(&tp->tap_mtx); 86863670Snsayer if ((tp->tap_flags & TAP_READY) != TAP_READY) { 869127098Srwatson mtx_unlock(&tp->tap_mtx); 870127098Srwatson 871127098Srwatson /* Unlocked read. */ 872121816Sbrooks TAPDEBUG("%s not ready. minor = %#x, tap_flags = 0x%x\n", 873183397Sed ifp->if_xname, dev2unit(dev), tp->tap_flags); 87463803Snsayer 87563670Snsayer return (EHOSTDOWN); 87663670Snsayer } 87763670Snsayer 87863670Snsayer tp->tap_flags &= ~TAP_RWAIT; 87963670Snsayer 88063670Snsayer /* sleep until we get a packet */ 88163670Snsayer do { 88290227Sdillon IF_DEQUEUE(&ifp->if_snd, m); 88363670Snsayer 88490227Sdillon if (m == NULL) { 885213028Sjhb if (flag & O_NONBLOCK) { 886213028Sjhb mtx_unlock(&tp->tap_mtx); 88763670Snsayer return (EWOULDBLOCK); 888213028Sjhb } 889111742Sdes 89063670Snsayer tp->tap_flags |= TAP_RWAIT; 891213028Sjhb error = mtx_sleep(tp, &tp->tap_mtx, PCATCH | (PZERO + 1), 892213028Sjhb "taprd", 0); 893213028Sjhb if (error) { 894213028Sjhb mtx_unlock(&tp->tap_mtx); 89563670Snsayer return (error); 896213028Sjhb } 89763670Snsayer } 89890227Sdillon } while (m == NULL); 899213028Sjhb mtx_unlock(&tp->tap_mtx); 90063670Snsayer 90163670Snsayer /* feed packet to bpf */ 902106939Ssam BPF_MTAP(ifp, m); 90363670Snsayer 90463670Snsayer /* xfer packet to user space */ 90590227Sdillon while ((m != NULL) && (uio->uio_resid > 0) && (error == 0)) { 90690227Sdillon len = min(uio->uio_resid, m->m_len); 90763670Snsayer if (len == 0) 90863670Snsayer break; 90963670Snsayer 910111741Sdes error = uiomove(mtod(m, void *), len, uio); 91190227Sdillon m = m_free(m); 91263670Snsayer } 91363670Snsayer 91490227Sdillon if (m != NULL) { 915121816Sbrooks TAPDEBUG("%s dropping mbuf, minor = %#x\n", ifp->if_xname, 916183397Sed dev2unit(dev)); 91790227Sdillon m_freem(m); 91863670Snsayer } 91963670Snsayer 92063670Snsayer return (error); 92163670Snsayer} /* tapread */ 92263670Snsayer 92363670Snsayer 92463670Snsayer/* 92563670Snsayer * tapwrite 92663670Snsayer * 92763670Snsayer * the cdevsw write interface - an atomic write is a packet - or else! 92863670Snsayer */ 92963670Snsayerstatic int 930156783Semaxtapwrite(struct cdev *dev, struct uio *uio, int flag) 93163670Snsayer{ 932166443Sbms struct ether_header *eh; 93363670Snsayer struct tap_softc *tp = dev->si_drv1; 934147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 935137101Sglebius struct mbuf *m; 93663670Snsayer 937240945Semaste TAPDEBUG("%s writing, minor = %#x\n", 938183397Sed ifp->if_xname, dev2unit(dev)); 93963670Snsayer 94063670Snsayer if (uio->uio_resid == 0) 94163670Snsayer return (0); 94263670Snsayer 94363670Snsayer if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) { 944194990Skib TAPDEBUG("%s invalid packet len = %zd, minor = %#x\n", 945183397Sed ifp->if_xname, uio->uio_resid, dev2unit(dev)); 94663803Snsayer 94763670Snsayer return (EIO); 94863670Snsayer } 94963670Snsayer 950243882Sglebius if ((m = m_uiotombuf(uio, M_NOWAIT, 0, ETHER_ALIGN, 951163915Sandre M_PKTHDR)) == NULL) { 95263670Snsayer ifp->if_ierrors ++; 953163986Scsjp return (ENOBUFS); 95463670Snsayer } 95563670Snsayer 956137101Sglebius m->m_pkthdr.rcvif = ifp; 957111742Sdes 958166443Sbms /* 959166443Sbms * Only pass a unicast frame to ether_input(), if it would actually 960166443Sbms * have been received by non-virtual hardware. 961166443Sbms */ 962166443Sbms if (m->m_len < sizeof(struct ether_header)) { 963166443Sbms m_freem(m); 964166443Sbms return (0); 965166443Sbms } 966166443Sbms eh = mtod(m, struct ether_header *); 967166443Sbms 968166443Sbms if (eh && (ifp->if_flags & IFF_PROMISC) == 0 && 969166443Sbms !ETHER_IS_MULTICAST(eh->ether_dhost) && 970166443Sbms bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) { 971166443Sbms m_freem(m); 972166443Sbms return (0); 973166443Sbms } 974166443Sbms 975106939Ssam /* Pass packet up to parent. */ 976236724Strociny CURVNET_SET(ifp->if_vnet); 977137101Sglebius (*ifp->if_input)(ifp, m); 978236724Strociny CURVNET_RESTORE(); 979106939Ssam ifp->if_ipackets ++; /* ibytes are counted in parent */ 98063670Snsayer 98163670Snsayer return (0); 98263670Snsayer} /* tapwrite */ 98363670Snsayer 98463670Snsayer 98563670Snsayer/* 98663670Snsayer * tappoll 98763670Snsayer * 98863670Snsayer * the poll interface, this is only useful on reads 98963670Snsayer * really. the write detect always returns true, write never blocks 99063670Snsayer * anyway, it either accepts the packet or drops it 99163670Snsayer */ 99263670Snsayerstatic int 993156783Semaxtappoll(struct cdev *dev, int events, struct thread *td) 99463670Snsayer{ 99563670Snsayer struct tap_softc *tp = dev->si_drv1; 996147256Sbrooks struct ifnet *ifp = tp->tap_ifp; 997213028Sjhb int revents = 0; 99863670Snsayer 999121816Sbrooks TAPDEBUG("%s polling, minor = %#x\n", 1000183397Sed ifp->if_xname, dev2unit(dev)); 100163670Snsayer 100263670Snsayer if (events & (POLLIN | POLLRDNORM)) { 1003213028Sjhb IFQ_LOCK(&ifp->if_snd); 1004213028Sjhb if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 1005121816Sbrooks TAPDEBUG("%s have data in queue. len = %d, " \ 1006121816Sbrooks "minor = %#x\n", ifp->if_xname, 1007183397Sed ifp->if_snd.ifq_len, dev2unit(dev)); 100863803Snsayer 100963670Snsayer revents |= (events & (POLLIN | POLLRDNORM)); 101083043Sbrooks } else { 1011121816Sbrooks TAPDEBUG("%s waiting for data, minor = %#x\n", 1012183397Sed ifp->if_xname, dev2unit(dev)); 101363803Snsayer 101483805Sjhb selrecord(td, &tp->tap_rsel); 101563670Snsayer } 1016213028Sjhb IFQ_UNLOCK(&ifp->if_snd); 101763670Snsayer } 101863670Snsayer 101963670Snsayer if (events & (POLLOUT | POLLWRNORM)) 102063670Snsayer revents |= (events & (POLLOUT | POLLWRNORM)); 102163670Snsayer 102263670Snsayer return (revents); 102363670Snsayer} /* tappoll */ 1024156783Semax 1025156783Semax 1026156783Semax/* 1027156783Semax * tap_kqfilter 1028156783Semax * 1029156783Semax * support for kevent() system call 1030156783Semax */ 1031156783Semaxstatic int 1032156783Semaxtapkqfilter(struct cdev *dev, struct knote *kn) 1033156783Semax{ 1034156783Semax struct tap_softc *tp = dev->si_drv1; 1035156783Semax struct ifnet *ifp = tp->tap_ifp; 1036156783Semax 1037156783Semax switch (kn->kn_filter) { 1038156783Semax case EVFILT_READ: 1039156783Semax TAPDEBUG("%s kqfilter: EVFILT_READ, minor = %#x\n", 1040183397Sed ifp->if_xname, dev2unit(dev)); 1041156783Semax kn->kn_fop = &tap_read_filterops; 1042156783Semax break; 1043156783Semax 1044156783Semax case EVFILT_WRITE: 1045156783Semax TAPDEBUG("%s kqfilter: EVFILT_WRITE, minor = %#x\n", 1046183397Sed ifp->if_xname, dev2unit(dev)); 1047156783Semax kn->kn_fop = &tap_write_filterops; 1048156783Semax break; 1049156783Semax 1050156783Semax default: 1051156783Semax TAPDEBUG("%s kqfilter: invalid filter, minor = %#x\n", 1052183397Sed ifp->if_xname, dev2unit(dev)); 1053156783Semax return (EINVAL); 1054156783Semax /* NOT REACHED */ 1055156783Semax } 1056156783Semax 1057213028Sjhb kn->kn_hook = tp; 1058156783Semax knlist_add(&tp->tap_rsel.si_note, kn, 0); 1059156783Semax 1060156783Semax return (0); 1061156783Semax} /* tapkqfilter */ 1062156783Semax 1063156783Semax 1064156783Semax/* 1065156783Semax * tap_kqread 1066156783Semax * 1067156783Semax * Return true if there is data in the interface queue 1068156783Semax */ 1069156783Semaxstatic int 1070156783Semaxtapkqread(struct knote *kn, long hint) 1071156783Semax{ 1072213028Sjhb int ret; 1073213028Sjhb struct tap_softc *tp = kn->kn_hook; 1074213028Sjhb struct cdev *dev = tp->tap_dev; 1075156783Semax struct ifnet *ifp = tp->tap_ifp; 1076156783Semax 1077156783Semax if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) { 1078156783Semax TAPDEBUG("%s have data in queue. len = %d, minor = %#x\n", 1079183397Sed ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev)); 1080156783Semax ret = 1; 1081156783Semax } else { 1082156783Semax TAPDEBUG("%s waiting for data, minor = %#x\n", 1083183397Sed ifp->if_xname, dev2unit(dev)); 1084156783Semax ret = 0; 1085156783Semax } 1086156783Semax 1087156783Semax return (ret); 1088156783Semax} /* tapkqread */ 1089156783Semax 1090156783Semax 1091156783Semax/* 1092156783Semax * tap_kqwrite 1093156783Semax * 1094156783Semax * Always can write. Return the MTU in kn->data 1095156783Semax */ 1096156783Semaxstatic int 1097156783Semaxtapkqwrite(struct knote *kn, long hint) 1098156783Semax{ 1099213028Sjhb struct tap_softc *tp = kn->kn_hook; 1100156783Semax struct ifnet *ifp = tp->tap_ifp; 1101156783Semax 1102156783Semax kn->kn_data = ifp->if_mtu; 1103156783Semax 1104156783Semax return (1); 1105156783Semax} /* tapkqwrite */ 1106156783Semax 1107156783Semax 1108156783Semaxstatic void 1109156783Semaxtapkqdetach(struct knote *kn) 1110156783Semax{ 1111213028Sjhb struct tap_softc *tp = kn->kn_hook; 1112156783Semax 1113156783Semax knlist_remove(&tp->tap_rsel.si_note, kn, 0); 1114156783Semax} /* tapkqdetach */ 1115156783Semax 1116