1/* $NetBSD: if_tun.c,v 1.14 1994/06/29 06:36:25 cgd Exp $ */ 2/*- 3 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 4 * 5 * Copyright (C) 1999-2000 by Maksim Yevmenkin <m_evmenkin@yahoo.com> 6 * All rights reserved. 7 * Copyright (c) 2019 Kyle Evans <kevans@FreeBSD.org> 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * BASED ON: 32 * ------------------------------------------------------------------------- 33 * 34 * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk> 35 * Nottingham University 1987. 36 * 37 * This source may be freely distributed, however I would be interested 38 * in any changes that are made. 39 * 40 * This driver takes packets off the IP i/f and hands them up to a 41 * user process to have its wicked way with. This driver has it's 42 * roots in a similar driver written by Phil Cockcroft (formerly) at 43 * UCL. This driver is based much more on read/write/poll mode of 44 * operation though. 45 * 46 * $FreeBSD$ 47 */ 48 49#include "opt_inet.h" 50#include "opt_inet6.h" 51 52#include <sys/param.h> 53#include <sys/lock.h> 54#include <sys/priv.h> 55#include <sys/proc.h> 56#include <sys/systm.h> 57#include <sys/jail.h> 58#include <sys/mbuf.h> 59#include <sys/module.h> 60#include <sys/socket.h> 61#include <sys/eventhandler.h> 62#include <sys/fcntl.h> 63#include <sys/filio.h> 64#include <sys/sockio.h> 65#include <sys/sx.h> 66#include <sys/syslog.h> 67#include <sys/ttycom.h> 68#include <sys/poll.h> 69#include <sys/selinfo.h> 70#include <sys/signalvar.h> 71#include <sys/filedesc.h> 72#include <sys/kernel.h> 73#include <sys/sysctl.h> 74#include <sys/conf.h> 75#include <sys/uio.h> 76#include <sys/malloc.h> 77#include <sys/random.h> 78#include <sys/ctype.h> 79 80#include <net/ethernet.h> 81#include <net/if.h> 82#include <net/if_var.h> 83#include <net/if_clone.h> 84#include <net/if_dl.h> 85#include <net/if_media.h> 86#include <net/if_types.h> 87#include <net/if_vlan_var.h> 88#include <net/netisr.h> 89#include <net/route.h> 90#include <net/vnet.h> 91#include <netinet/in.h> 92#ifdef INET 93#include <netinet/ip.h> 94#endif 95#ifdef INET6 96#include <netinet/ip6.h> 97#include <netinet6/ip6_var.h> 98#endif 99#include <netinet/udp.h> 100#include <netinet/tcp.h> 101#include <net/bpf.h> 102#include <net/if_tap.h> 103#include <net/if_tun.h> 104 105#include <dev/virtio/network/virtio_net.h> 106 107#include <sys/queue.h> 108#include <sys/condvar.h> 109#include <security/mac/mac_framework.h> 110 111struct tuntap_driver; 112 113/* 114 * tun_list is protected by global tunmtx. Other mutable fields are 115 * protected by tun->tun_mtx, or by their owning subsystem. tun_dev is 116 * static for the duration of a tunnel interface. 117 */ 118struct tuntap_softc { 119 TAILQ_ENTRY(tuntap_softc) tun_list; 120 struct cdev *tun_alias; 121 struct cdev *tun_dev; 122 u_short tun_flags; /* misc flags */ 123#define TUN_OPEN 0x0001 124#define TUN_INITED 0x0002 125#define TUN_UNUSED1 0x0008 126#define TUN_UNUSED2 0x0010 127#define TUN_LMODE 0x0020 128#define TUN_RWAIT 0x0040 129#define TUN_ASYNC 0x0080 130#define TUN_IFHEAD 0x0100 131#define TUN_DYING 0x0200 132#define TUN_L2 0x0400 133#define TUN_VMNET 0x0800 134 135#define TUN_DRIVER_IDENT_MASK (TUN_L2 | TUN_VMNET) 136#define TUN_READY (TUN_OPEN | TUN_INITED) 137 138 pid_t tun_pid; /* owning pid */ 139 struct ifnet *tun_ifp; /* the interface */ 140 struct sigio *tun_sigio; /* async I/O info */ 141 struct tuntap_driver *tun_drv; /* appropriate driver */ 142 struct selinfo tun_rsel; /* read select */ 143 struct mtx tun_mtx; /* softc field mutex */ 144 struct cv tun_cv; /* for ref'd dev destroy */ 145 struct ether_addr tun_ether; /* remote address */ 146 int tun_busy; /* busy count */ 147 int tun_vhdrlen; /* virtio-net header length */ 148}; 149#define TUN2IFP(sc) ((sc)->tun_ifp) 150 151#define TUNDEBUG if (tundebug) if_printf 152 153#define TUN_LOCK(tp) mtx_lock(&(tp)->tun_mtx) 154#define TUN_UNLOCK(tp) mtx_unlock(&(tp)->tun_mtx) 155#define TUN_LOCK_ASSERT(tp) mtx_assert(&(tp)->tun_mtx, MA_OWNED); 156 157#define TUN_VMIO_FLAG_MASK 0x0fff 158 159/* 160 * Interface capabilities of a tap device that supports the virtio-net 161 * header. 162 */ 163#define TAP_VNET_HDR_CAPS (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6 \ 164 | IFCAP_VLAN_HWCSUM \ 165 | IFCAP_TSO | IFCAP_LRO \ 166 | IFCAP_VLAN_HWTSO) 167 168#define TAP_ALL_OFFLOAD (CSUM_TSO | CSUM_TCP | CSUM_UDP |\ 169 CSUM_TCP_IPV6 | CSUM_UDP_IPV6) 170 171/* 172 * All mutable global variables in if_tun are locked using tunmtx, with 173 * the exception of tundebug, which is used unlocked, and the drivers' *clones, 174 * which are static after setup. 175 */ 176static struct mtx tunmtx; 177static eventhandler_tag arrival_tag; 178static eventhandler_tag clone_tag; 179static const char tunname[] = "tun"; 180static const char tapname[] = "tap"; 181static const char vmnetname[] = "vmnet"; 182static MALLOC_DEFINE(M_TUN, tunname, "Tunnel Interface"); 183static int tundebug = 0; 184static int tundclone = 1; 185static int tap_allow_uopen = 0; /* allow user devfs cloning */ 186static int tapuponopen = 0; /* IFF_UP on open() */ 187static int tapdclone = 1; /* enable devfs cloning */ 188 189static TAILQ_HEAD(,tuntap_softc) tunhead = TAILQ_HEAD_INITIALIZER(tunhead); 190SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, ""); 191 192static struct sx tun_ioctl_sx; 193SX_SYSINIT(tun_ioctl_sx, &tun_ioctl_sx, "tun_ioctl"); 194 195SYSCTL_DECL(_net_link); 196/* tun */ 197static SYSCTL_NODE(_net_link, OID_AUTO, tun, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 198 "IP tunnel software network interface"); 199SYSCTL_INT(_net_link_tun, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tundclone, 0, 200 "Enable legacy devfs interface creation"); 201 202/* tap */ 203static SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 204 "Ethernet tunnel software network interface"); 205SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tap_allow_uopen, 0, 206 "Enable legacy devfs interface creation for all users"); 207SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0, 208 "Bring interface up when /dev/tap is opened"); 209SYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tapdclone, 0, 210 "Enable legacy devfs interface creation"); 211SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tundebug, 0, ""); 212 213static int tun_create_device(struct tuntap_driver *drv, int unit, 214 struct ucred *cr, struct cdev **dev, const char *name); 215static int tun_busy_locked(struct tuntap_softc *tp); 216static void tun_unbusy_locked(struct tuntap_softc *tp); 217static int tun_busy(struct tuntap_softc *tp); 218static void tun_unbusy(struct tuntap_softc *tp); 219 220static int tuntap_name2info(const char *name, int *unit, int *flags); 221static void tunclone(void *arg, struct ucred *cred, char *name, 222 int namelen, struct cdev **dev); 223static void tuncreate(struct cdev *dev); 224static void tundtor(void *data); 225static void tunrename(void *arg, struct ifnet *ifp); 226static int tunifioctl(struct ifnet *, u_long, caddr_t); 227static void tuninit(struct ifnet *); 228static void tunifinit(void *xtp); 229static int tuntapmodevent(module_t, int, void *); 230static int tunoutput(struct ifnet *, struct mbuf *, 231 const struct sockaddr *, struct route *ro); 232static void tunstart(struct ifnet *); 233static void tunstart_l2(struct ifnet *); 234 235static int tun_clone_match(struct if_clone *ifc, const char *name); 236static int tap_clone_match(struct if_clone *ifc, const char *name); 237static int vmnet_clone_match(struct if_clone *ifc, const char *name); 238static int tun_clone_create(struct if_clone *, char *, size_t, caddr_t); 239static int tun_clone_destroy(struct if_clone *, struct ifnet *); 240static void tun_vnethdr_set(struct ifnet *ifp, int vhdrlen); 241 242static d_open_t tunopen; 243static d_read_t tunread; 244static d_write_t tunwrite; 245static d_ioctl_t tunioctl; 246static d_poll_t tunpoll; 247static d_kqfilter_t tunkqfilter; 248 249static int tunkqread(struct knote *, long); 250static int tunkqwrite(struct knote *, long); 251static void tunkqdetach(struct knote *); 252 253static struct filterops tun_read_filterops = { 254 .f_isfd = 1, 255 .f_attach = NULL, 256 .f_detach = tunkqdetach, 257 .f_event = tunkqread, 258}; 259 260static struct filterops tun_write_filterops = { 261 .f_isfd = 1, 262 .f_attach = NULL, 263 .f_detach = tunkqdetach, 264 .f_event = tunkqwrite, 265}; 266 267static struct tuntap_driver { 268 struct cdevsw cdevsw; 269 int ident_flags; 270 struct unrhdr *unrhdr; 271 struct clonedevs *clones; 272 ifc_match_t *clone_match_fn; 273 ifc_create_t *clone_create_fn; 274 ifc_destroy_t *clone_destroy_fn; 275} tuntap_drivers[] = { 276 { 277 .ident_flags = 0, 278 .cdevsw = { 279 .d_version = D_VERSION, 280 .d_flags = D_NEEDMINOR, 281 .d_open = tunopen, 282 .d_read = tunread, 283 .d_write = tunwrite, 284 .d_ioctl = tunioctl, 285 .d_poll = tunpoll, 286 .d_kqfilter = tunkqfilter, 287 .d_name = tunname, 288 }, 289 .clone_match_fn = tun_clone_match, 290 .clone_create_fn = tun_clone_create, 291 .clone_destroy_fn = tun_clone_destroy, 292 }, 293 { 294 .ident_flags = TUN_L2, 295 .cdevsw = { 296 .d_version = D_VERSION, 297 .d_flags = D_NEEDMINOR, 298 .d_open = tunopen, 299 .d_read = tunread, 300 .d_write = tunwrite, 301 .d_ioctl = tunioctl, 302 .d_poll = tunpoll, 303 .d_kqfilter = tunkqfilter, 304 .d_name = tapname, 305 }, 306 .clone_match_fn = tap_clone_match, 307 .clone_create_fn = tun_clone_create, 308 .clone_destroy_fn = tun_clone_destroy, 309 }, 310 { 311 .ident_flags = TUN_L2 | TUN_VMNET, 312 .cdevsw = { 313 .d_version = D_VERSION, 314 .d_flags = D_NEEDMINOR, 315 .d_open = tunopen, 316 .d_read = tunread, 317 .d_write = tunwrite, 318 .d_ioctl = tunioctl, 319 .d_poll = tunpoll, 320 .d_kqfilter = tunkqfilter, 321 .d_name = vmnetname, 322 }, 323 .clone_match_fn = vmnet_clone_match, 324 .clone_create_fn = tun_clone_create, 325 .clone_destroy_fn = tun_clone_destroy, 326 }, 327}; 328 329struct tuntap_driver_cloner { 330 SLIST_ENTRY(tuntap_driver_cloner) link; 331 struct tuntap_driver *drv; 332 struct if_clone *cloner; 333}; 334 335VNET_DEFINE_STATIC(SLIST_HEAD(, tuntap_driver_cloner), tuntap_driver_cloners) = 336 SLIST_HEAD_INITIALIZER(tuntap_driver_cloners); 337 338#define V_tuntap_driver_cloners VNET(tuntap_driver_cloners) 339 340/* 341 * Mechanism for marking a tunnel device as busy so that we can safely do some 342 * orthogonal operations (such as operations on devices) without racing against 343 * tun_destroy. tun_destroy will wait on the condvar if we're at all busy or 344 * open, to be woken up when the condition is alleviated. 345 */ 346static int 347tun_busy_locked(struct tuntap_softc *tp) 348{ 349 350 TUN_LOCK_ASSERT(tp); 351 if ((tp->tun_flags & TUN_DYING) != 0) { 352 /* 353 * Perhaps unintuitive, but the device is busy going away. 354 * Other interpretations of EBUSY from tun_busy make little 355 * sense, since making a busy device even more busy doesn't 356 * sound like a problem. 357 */ 358 return (EBUSY); 359 } 360 361 ++tp->tun_busy; 362 return (0); 363} 364 365static void 366tun_unbusy_locked(struct tuntap_softc *tp) 367{ 368 369 TUN_LOCK_ASSERT(tp); 370 KASSERT(tp->tun_busy != 0, ("tun_unbusy: called for non-busy tunnel")); 371 372 --tp->tun_busy; 373 /* Wake up anything that may be waiting on our busy tunnel. */ 374 if (tp->tun_busy == 0) 375 cv_broadcast(&tp->tun_cv); 376} 377 378static int 379tun_busy(struct tuntap_softc *tp) 380{ 381 int ret; 382 383 TUN_LOCK(tp); 384 ret = tun_busy_locked(tp); 385 TUN_UNLOCK(tp); 386 return (ret); 387} 388 389static void 390tun_unbusy(struct tuntap_softc *tp) 391{ 392 393 TUN_LOCK(tp); 394 tun_unbusy_locked(tp); 395 TUN_UNLOCK(tp); 396} 397 398/* 399 * Sets unit and/or flags given the device name. Must be called with correct 400 * vnet context. 401 */ 402static int 403tuntap_name2info(const char *name, int *outunit, int *outflags) 404{ 405 struct tuntap_driver *drv; 406 struct tuntap_driver_cloner *drvc; 407 char *dname; 408 int flags, unit; 409 bool found; 410 411 if (name == NULL) 412 return (EINVAL); 413 414 /* 415 * Needed for dev_stdclone, but dev_stdclone will not modify, it just 416 * wants to be able to pass back a char * through the second param. We 417 * will always set that as NULL here, so we'll fake it. 418 */ 419 dname = __DECONST(char *, name); 420 found = false; 421 422 KASSERT(!SLIST_EMPTY(&V_tuntap_driver_cloners), 423 ("tuntap_driver_cloners failed to initialize")); 424 SLIST_FOREACH(drvc, &V_tuntap_driver_cloners, link) { 425 KASSERT(drvc->drv != NULL, 426 ("tuntap_driver_cloners entry not properly initialized")); 427 drv = drvc->drv; 428 429 if (strcmp(name, drv->cdevsw.d_name) == 0) { 430 found = true; 431 unit = -1; 432 flags = drv->ident_flags; 433 break; 434 } 435 436 if (dev_stdclone(dname, NULL, drv->cdevsw.d_name, &unit) == 1) { 437 found = true; 438 flags = drv->ident_flags; 439 break; 440 } 441 } 442 443 if (!found) 444 return (ENXIO); 445 446 if (outunit != NULL) 447 *outunit = unit; 448 if (outflags != NULL) 449 *outflags = flags; 450 return (0); 451} 452 453/* 454 * Get driver information from a set of flags specified. Masks the identifying 455 * part of the flags and compares it against all of the available 456 * tuntap_drivers. Must be called with correct vnet context. 457 */ 458static struct tuntap_driver * 459tuntap_driver_from_flags(int tun_flags) 460{ 461 struct tuntap_driver *drv; 462 struct tuntap_driver_cloner *drvc; 463 464 KASSERT(!SLIST_EMPTY(&V_tuntap_driver_cloners), 465 ("tuntap_driver_cloners failed to initialize")); 466 SLIST_FOREACH(drvc, &V_tuntap_driver_cloners, link) { 467 KASSERT(drvc->drv != NULL, 468 ("tuntap_driver_cloners entry not properly initialized")); 469 drv = drvc->drv; 470 if ((tun_flags & TUN_DRIVER_IDENT_MASK) == drv->ident_flags) 471 return (drv); 472 } 473 474 return (NULL); 475} 476 477static int 478tun_clone_match(struct if_clone *ifc, const char *name) 479{ 480 int tunflags; 481 482 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 483 if ((tunflags & TUN_L2) == 0) 484 return (1); 485 } 486 487 return (0); 488} 489 490static int 491tap_clone_match(struct if_clone *ifc, const char *name) 492{ 493 int tunflags; 494 495 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 496 if ((tunflags & (TUN_L2 | TUN_VMNET)) == TUN_L2) 497 return (1); 498 } 499 500 return (0); 501} 502 503static int 504vmnet_clone_match(struct if_clone *ifc, const char *name) 505{ 506 int tunflags; 507 508 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 509 if ((tunflags & TUN_VMNET) != 0) 510 return (1); 511 } 512 513 return (0); 514} 515 516static int 517tun_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params) 518{ 519 struct tuntap_driver *drv; 520 struct cdev *dev; 521 int err, i, tunflags, unit; 522 523 tunflags = 0; 524 /* The name here tells us exactly what we're creating */ 525 err = tuntap_name2info(name, &unit, &tunflags); 526 if (err != 0) 527 return (err); 528 529 drv = tuntap_driver_from_flags(tunflags); 530 if (drv == NULL) 531 return (ENXIO); 532 533 if (unit != -1) { 534 /* If this unit number is still available that's okay. */ 535 if (alloc_unr_specific(drv->unrhdr, unit) == -1) 536 return (EEXIST); 537 } else { 538 unit = alloc_unr(drv->unrhdr); 539 } 540 541 snprintf(name, IFNAMSIZ, "%s%d", drv->cdevsw.d_name, unit); 542 543 /* find any existing device, or allocate new unit number */ 544 dev = NULL; 545 i = clone_create(&drv->clones, &drv->cdevsw, &unit, &dev, 0); 546 /* No preexisting struct cdev *, create one */ 547 if (i != 0) 548 i = tun_create_device(drv, unit, NULL, &dev, name); 549 if (i == 0) 550 tuncreate(dev); 551 552 return (i); 553} 554 555static void 556tunclone(void *arg, struct ucred *cred, char *name, int namelen, 557 struct cdev **dev) 558{ 559 char devname[SPECNAMELEN + 1]; 560 struct tuntap_driver *drv; 561 int append_unit, i, u, tunflags; 562 bool mayclone; 563 564 if (*dev != NULL) 565 return; 566 567 tunflags = 0; 568 CURVNET_SET(CRED_TO_VNET(cred)); 569 if (tuntap_name2info(name, &u, &tunflags) != 0) 570 goto out; /* Not recognized */ 571 572 if (u != -1 && u > IF_MAXUNIT) 573 goto out; /* Unit number too high */ 574 575 mayclone = priv_check_cred(cred, PRIV_NET_IFCREATE) == 0; 576 if ((tunflags & TUN_L2) != 0) { 577 /* tap/vmnet allow user open with a sysctl */ 578 mayclone = (mayclone || tap_allow_uopen) && tapdclone; 579 } else { 580 mayclone = mayclone && tundclone; 581 } 582 583 /* 584 * If tun cloning is enabled, only the superuser can create an 585 * interface. 586 */ 587 if (!mayclone) 588 goto out; 589 590 if (u == -1) 591 append_unit = 1; 592 else 593 append_unit = 0; 594 595 drv = tuntap_driver_from_flags(tunflags); 596 if (drv == NULL) 597 goto out; 598 599 /* find any existing device, or allocate new unit number */ 600 i = clone_create(&drv->clones, &drv->cdevsw, &u, dev, 0); 601 if (i) { 602 if (append_unit) { 603 namelen = snprintf(devname, sizeof(devname), "%s%d", 604 name, u); 605 name = devname; 606 } 607 608 i = tun_create_device(drv, u, cred, dev, name); 609 } 610 if (i == 0) 611 if_clone_create(name, namelen, NULL); 612out: 613 CURVNET_RESTORE(); 614} 615 616static void 617tun_destroy(struct tuntap_softc *tp) 618{ 619 620 TUN_LOCK(tp); 621 tp->tun_flags |= TUN_DYING; 622 if (tp->tun_busy != 0) 623 cv_wait_unlock(&tp->tun_cv, &tp->tun_mtx); 624 else 625 TUN_UNLOCK(tp); 626 627 CURVNET_SET(TUN2IFP(tp)->if_vnet); 628 629 /* destroy_dev will take care of any alias. */ 630 destroy_dev(tp->tun_dev); 631 seldrain(&tp->tun_rsel); 632 knlist_clear(&tp->tun_rsel.si_note, 0); 633 knlist_destroy(&tp->tun_rsel.si_note); 634 if ((tp->tun_flags & TUN_L2) != 0) { 635 ether_ifdetach(TUN2IFP(tp)); 636 } else { 637 bpfdetach(TUN2IFP(tp)); 638 if_detach(TUN2IFP(tp)); 639 } 640 sx_xlock(&tun_ioctl_sx); 641 TUN2IFP(tp)->if_softc = NULL; 642 sx_xunlock(&tun_ioctl_sx); 643 free_unr(tp->tun_drv->unrhdr, TUN2IFP(tp)->if_dunit); 644 if_free(TUN2IFP(tp)); 645 mtx_destroy(&tp->tun_mtx); 646 cv_destroy(&tp->tun_cv); 647 free(tp, M_TUN); 648 CURVNET_RESTORE(); 649} 650 651static int 652tun_clone_destroy(struct if_clone *ifc __unused, struct ifnet *ifp) 653{ 654 struct tuntap_softc *tp = ifp->if_softc; 655 656 mtx_lock(&tunmtx); 657 TAILQ_REMOVE(&tunhead, tp, tun_list); 658 mtx_unlock(&tunmtx); 659 tun_destroy(tp); 660 661 return (0); 662} 663 664static void 665vnet_tun_init(const void *unused __unused) 666{ 667 struct tuntap_driver *drv; 668 struct tuntap_driver_cloner *drvc; 669 int i; 670 671 for (i = 0; i < nitems(tuntap_drivers); ++i) { 672 drv = &tuntap_drivers[i]; 673 drvc = malloc(sizeof(*drvc), M_TUN, M_WAITOK | M_ZERO); 674 675 drvc->drv = drv; 676 drvc->cloner = if_clone_advanced(drv->cdevsw.d_name, 0, 677 drv->clone_match_fn, drv->clone_create_fn, 678 drv->clone_destroy_fn); 679 SLIST_INSERT_HEAD(&V_tuntap_driver_cloners, drvc, link); 680 }; 681} 682VNET_SYSINIT(vnet_tun_init, SI_SUB_PROTO_IF, SI_ORDER_ANY, 683 vnet_tun_init, NULL); 684 685static void 686vnet_tun_uninit(const void *unused __unused) 687{ 688 struct tuntap_driver_cloner *drvc; 689 690 while (!SLIST_EMPTY(&V_tuntap_driver_cloners)) { 691 drvc = SLIST_FIRST(&V_tuntap_driver_cloners); 692 SLIST_REMOVE_HEAD(&V_tuntap_driver_cloners, link); 693 694 if_clone_detach(drvc->cloner); 695 free(drvc, M_TUN); 696 } 697} 698VNET_SYSUNINIT(vnet_tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY, 699 vnet_tun_uninit, NULL); 700 701static void 702tun_uninit(const void *unused __unused) 703{ 704 struct tuntap_driver *drv; 705 struct tuntap_softc *tp; 706 int i; 707 708 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, arrival_tag); 709 EVENTHANDLER_DEREGISTER(dev_clone, clone_tag); 710 drain_dev_clone_events(); 711 712 mtx_lock(&tunmtx); 713 while ((tp = TAILQ_FIRST(&tunhead)) != NULL) { 714 TAILQ_REMOVE(&tunhead, tp, tun_list); 715 mtx_unlock(&tunmtx); 716 tun_destroy(tp); 717 mtx_lock(&tunmtx); 718 } 719 mtx_unlock(&tunmtx); 720 for (i = 0; i < nitems(tuntap_drivers); ++i) { 721 drv = &tuntap_drivers[i]; 722 delete_unrhdr(drv->unrhdr); 723 clone_cleanup(&drv->clones); 724 } 725 mtx_destroy(&tunmtx); 726} 727SYSUNINIT(tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY, tun_uninit, NULL); 728 729static struct tuntap_driver * 730tuntap_driver_from_ifnet(const struct ifnet *ifp) 731{ 732 struct tuntap_driver *drv; 733 int i; 734 735 if (ifp == NULL) 736 return (NULL); 737 738 for (i = 0; i < nitems(tuntap_drivers); ++i) { 739 drv = &tuntap_drivers[i]; 740 if (strcmp(ifp->if_dname, drv->cdevsw.d_name) == 0) 741 return (drv); 742 } 743 744 return (NULL); 745} 746 747static int 748tuntapmodevent(module_t mod, int type, void *data) 749{ 750 struct tuntap_driver *drv; 751 int i; 752 753 switch (type) { 754 case MOD_LOAD: 755 mtx_init(&tunmtx, "tunmtx", NULL, MTX_DEF); 756 for (i = 0; i < nitems(tuntap_drivers); ++i) { 757 drv = &tuntap_drivers[i]; 758 clone_setup(&drv->clones); 759 drv->unrhdr = new_unrhdr(0, IF_MAXUNIT, &tunmtx); 760 } 761 arrival_tag = EVENTHANDLER_REGISTER(ifnet_arrival_event, 762 tunrename, 0, 1000); 763 if (arrival_tag == NULL) 764 return (ENOMEM); 765 clone_tag = EVENTHANDLER_REGISTER(dev_clone, tunclone, 0, 1000); 766 if (clone_tag == NULL) 767 return (ENOMEM); 768 break; 769 case MOD_UNLOAD: 770 /* See tun_uninit, so it's done after the vnet_sysuninit() */ 771 break; 772 default: 773 return EOPNOTSUPP; 774 } 775 return 0; 776} 777 778static moduledata_t tuntap_mod = { 779 "if_tuntap", 780 tuntapmodevent, 781 0 782}; 783 784/* We'll only ever have these two, so no need for a macro. */ 785static moduledata_t tun_mod = { "if_tun", NULL, 0 }; 786static moduledata_t tap_mod = { "if_tap", NULL, 0 }; 787 788DECLARE_MODULE(if_tuntap, tuntap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 789MODULE_VERSION(if_tuntap, 1); 790DECLARE_MODULE(if_tun, tun_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 791MODULE_VERSION(if_tun, 1); 792DECLARE_MODULE(if_tap, tap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 793MODULE_VERSION(if_tap, 1); 794 795static int 796tun_create_device(struct tuntap_driver *drv, int unit, struct ucred *cr, 797 struct cdev **dev, const char *name) 798{ 799 struct make_dev_args args; 800 struct tuntap_softc *tp; 801 int error; 802 803 tp = malloc(sizeof(*tp), M_TUN, M_WAITOK | M_ZERO); 804 mtx_init(&tp->tun_mtx, "tun_mtx", NULL, MTX_DEF); 805 cv_init(&tp->tun_cv, "tun_condvar"); 806 tp->tun_flags = drv->ident_flags; 807 tp->tun_drv = drv; 808 809 make_dev_args_init(&args); 810 if (cr != NULL) 811 args.mda_flags = MAKEDEV_REF; 812 args.mda_devsw = &drv->cdevsw; 813 args.mda_cr = cr; 814 args.mda_uid = UID_UUCP; 815 args.mda_gid = GID_DIALER; 816 args.mda_mode = 0600; 817 args.mda_unit = unit; 818 args.mda_si_drv1 = tp; 819 error = make_dev_s(&args, dev, "%s", name); 820 if (error != 0) { 821 free(tp, M_TUN); 822 return (error); 823 } 824 825 KASSERT((*dev)->si_drv1 != NULL, 826 ("Failed to set si_drv1 at %s creation", name)); 827 tp->tun_dev = *dev; 828 knlist_init_mtx(&tp->tun_rsel.si_note, &tp->tun_mtx); 829 mtx_lock(&tunmtx); 830 TAILQ_INSERT_TAIL(&tunhead, tp, tun_list); 831 mtx_unlock(&tunmtx); 832 return (0); 833} 834 835static void 836tunstart(struct ifnet *ifp) 837{ 838 struct tuntap_softc *tp = ifp->if_softc; 839 struct mbuf *m; 840 841 TUNDEBUG(ifp, "starting\n"); 842 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 843 IFQ_LOCK(&ifp->if_snd); 844 IFQ_POLL_NOLOCK(&ifp->if_snd, m); 845 if (m == NULL) { 846 IFQ_UNLOCK(&ifp->if_snd); 847 return; 848 } 849 IFQ_UNLOCK(&ifp->if_snd); 850 } 851 852 TUN_LOCK(tp); 853 if (tp->tun_flags & TUN_RWAIT) { 854 tp->tun_flags &= ~TUN_RWAIT; 855 wakeup(tp); 856 } 857 selwakeuppri(&tp->tun_rsel, PZERO + 1); 858 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 859 if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio) { 860 TUN_UNLOCK(tp); 861 pgsigio(&tp->tun_sigio, SIGIO, 0); 862 } else 863 TUN_UNLOCK(tp); 864} 865 866/* 867 * tunstart_l2 868 * 869 * queue packets from higher level ready to put out 870 */ 871static void 872tunstart_l2(struct ifnet *ifp) 873{ 874 struct tuntap_softc *tp = ifp->if_softc; 875 876 TUNDEBUG(ifp, "starting\n"); 877 878 /* 879 * do not junk pending output if we are in VMnet mode. 880 * XXX: can this do any harm because of queue overflow? 881 */ 882 883 TUN_LOCK(tp); 884 if (((tp->tun_flags & TUN_VMNET) == 0) && 885 ((tp->tun_flags & TUN_READY) != TUN_READY)) { 886 struct mbuf *m; 887 888 /* Unlocked read. */ 889 TUNDEBUG(ifp, "not ready, tun_flags = 0x%x\n", tp->tun_flags); 890 891 for (;;) { 892 IF_DEQUEUE(&ifp->if_snd, m); 893 if (m != NULL) { 894 m_freem(m); 895 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 896 } else 897 break; 898 } 899 TUN_UNLOCK(tp); 900 901 return; 902 } 903 904 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 905 906 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 907 if (tp->tun_flags & TUN_RWAIT) { 908 tp->tun_flags &= ~TUN_RWAIT; 909 wakeup(tp); 910 } 911 912 if ((tp->tun_flags & TUN_ASYNC) && (tp->tun_sigio != NULL)) { 913 TUN_UNLOCK(tp); 914 pgsigio(&tp->tun_sigio, SIGIO, 0); 915 TUN_LOCK(tp); 916 } 917 918 selwakeuppri(&tp->tun_rsel, PZERO+1); 919 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 920 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); /* obytes are counted in ether_output */ 921 } 922 923 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 924 TUN_UNLOCK(tp); 925} /* tunstart_l2 */ 926 927/* XXX: should return an error code so it can fail. */ 928static void 929tuncreate(struct cdev *dev) 930{ 931 struct tuntap_driver *drv; 932 struct tuntap_softc *tp; 933 struct ifnet *ifp; 934 struct ether_addr eaddr; 935 int iflags; 936 u_char type; 937 938 tp = dev->si_drv1; 939 KASSERT(tp != NULL, 940 ("si_drv1 should have been initialized at creation")); 941 942 drv = tp->tun_drv; 943 iflags = IFF_MULTICAST; 944 if ((tp->tun_flags & TUN_L2) != 0) { 945 type = IFT_ETHER; 946 iflags |= IFF_BROADCAST | IFF_SIMPLEX; 947 } else { 948 type = IFT_PPP; 949 iflags |= IFF_POINTOPOINT; 950 } 951 ifp = tp->tun_ifp = if_alloc(type); 952 if (ifp == NULL) 953 panic("%s%d: failed to if_alloc() interface.\n", 954 drv->cdevsw.d_name, dev2unit(dev)); 955 ifp->if_softc = tp; 956 if_initname(ifp, drv->cdevsw.d_name, dev2unit(dev)); 957 ifp->if_ioctl = tunifioctl; 958 ifp->if_flags = iflags; 959 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 960 ifp->if_capabilities |= IFCAP_LINKSTATE; 961 ifp->if_capenable |= IFCAP_LINKSTATE; 962 963 if ((tp->tun_flags & TUN_L2) != 0) { 964 ifp->if_init = tunifinit; 965 ifp->if_start = tunstart_l2; 966 967 ether_gen_addr(ifp, &eaddr); 968 ether_ifattach(ifp, eaddr.octet); 969 } else { 970 ifp->if_mtu = TUNMTU; 971 ifp->if_start = tunstart; 972 ifp->if_output = tunoutput; 973 974 ifp->if_snd.ifq_drv_maxlen = 0; 975 IFQ_SET_READY(&ifp->if_snd); 976 977 if_attach(ifp); 978 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 979 } 980 981 TUN_LOCK(tp); 982 tp->tun_flags |= TUN_INITED; 983 TUN_UNLOCK(tp); 984 985 TUNDEBUG(ifp, "interface %s is created, minor = %#x\n", 986 ifp->if_xname, dev2unit(dev)); 987} 988 989static void 990tunrename(void *arg __unused, struct ifnet *ifp) 991{ 992 struct tuntap_softc *tp; 993 int error; 994 995 if ((ifp->if_flags & IFF_RENAMING) == 0) 996 return; 997 998 if (tuntap_driver_from_ifnet(ifp) == NULL) 999 return; 1000 1001 /* 1002 * We need to grab the ioctl sx long enough to make sure the softc is 1003 * still there. If it is, we can safely try to busy the tun device. 1004 * The busy may fail if the device is currently dying, in which case 1005 * we do nothing. If it doesn't fail, the busy count stops the device 1006 * from dying until we've created the alias (that will then be 1007 * subsequently destroyed). 1008 */ 1009 sx_xlock(&tun_ioctl_sx); 1010 tp = ifp->if_softc; 1011 if (tp == NULL) { 1012 sx_xunlock(&tun_ioctl_sx); 1013 return; 1014 } 1015 error = tun_busy(tp); 1016 sx_xunlock(&tun_ioctl_sx); 1017 if (error != 0) 1018 return; 1019 if (tp->tun_alias != NULL) { 1020 destroy_dev(tp->tun_alias); 1021 tp->tun_alias = NULL; 1022 } 1023 1024 if (strcmp(ifp->if_xname, tp->tun_dev->si_name) == 0) 1025 goto out; 1026 1027 /* 1028 * Failure's ok, aliases are created on a best effort basis. If a 1029 * tun user/consumer decides to rename the interface to conflict with 1030 * another device (non-ifnet) on the system, we will assume they know 1031 * what they are doing. make_dev_alias_p won't touch tun_alias on 1032 * failure, so we use it but ignore the return value. 1033 */ 1034 make_dev_alias_p(MAKEDEV_CHECKNAME, &tp->tun_alias, tp->tun_dev, "%s", 1035 ifp->if_xname); 1036out: 1037 tun_unbusy(tp); 1038} 1039 1040static int 1041tunopen(struct cdev *dev, int flag, int mode, struct thread *td) 1042{ 1043 struct ifnet *ifp; 1044 struct tuntap_softc *tp; 1045 int error, tunflags; 1046 1047 tunflags = 0; 1048 CURVNET_SET(TD_TO_VNET(td)); 1049 error = tuntap_name2info(dev->si_name, NULL, &tunflags); 1050 if (error != 0) { 1051 CURVNET_RESTORE(); 1052 return (error); /* Shouldn't happen */ 1053 } 1054 1055 tp = dev->si_drv1; 1056 KASSERT(tp != NULL, 1057 ("si_drv1 should have been initialized at creation")); 1058 1059 TUN_LOCK(tp); 1060 if ((tp->tun_flags & TUN_INITED) == 0) { 1061 TUN_UNLOCK(tp); 1062 CURVNET_RESTORE(); 1063 return (ENXIO); 1064 } 1065 if ((tp->tun_flags & (TUN_OPEN | TUN_DYING)) != 0) { 1066 TUN_UNLOCK(tp); 1067 CURVNET_RESTORE(); 1068 return (EBUSY); 1069 } 1070 1071 error = tun_busy_locked(tp); 1072 KASSERT(error == 0, ("Must be able to busy an unopen tunnel")); 1073 ifp = TUN2IFP(tp); 1074 1075 if ((tp->tun_flags & TUN_L2) != 0) { 1076 bcopy(IF_LLADDR(ifp), tp->tun_ether.octet, 1077 sizeof(tp->tun_ether.octet)); 1078 1079 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1080 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1081 1082 if (tapuponopen) 1083 ifp->if_flags |= IFF_UP; 1084 } 1085 1086 tp->tun_pid = td->td_proc->p_pid; 1087 tp->tun_flags |= TUN_OPEN; 1088 1089 if_link_state_change(ifp, LINK_STATE_UP); 1090 TUNDEBUG(ifp, "open\n"); 1091 TUN_UNLOCK(tp); 1092 1093 /* 1094 * This can fail with either ENOENT or EBUSY. This is in the middle of 1095 * d_open, so ENOENT should not be possible. EBUSY is possible, but 1096 * the only cdevpriv dtor being set will be tundtor and the softc being 1097 * passed is constant for a given cdev. We ignore the possible error 1098 * because of this as either "unlikely" or "not actually a problem." 1099 */ 1100 (void)devfs_set_cdevpriv(tp, tundtor); 1101 CURVNET_RESTORE(); 1102 return (0); 1103} 1104 1105/* 1106 * tundtor - tear down the device - mark i/f down & delete 1107 * routing info 1108 */ 1109static void 1110tundtor(void *data) 1111{ 1112 struct proc *p; 1113 struct tuntap_softc *tp; 1114 struct ifnet *ifp; 1115 bool l2tun; 1116 1117 tp = data; 1118 p = curproc; 1119 ifp = TUN2IFP(tp); 1120 1121 TUN_LOCK(tp); 1122 1123 /* 1124 * Realistically, we can't be obstinate here. This only means that the 1125 * tuntap device was closed out of order, and the last closer wasn't the 1126 * controller. These are still good to know about, though, as software 1127 * should avoid multiple processes with a tuntap device open and 1128 * ill-defined transfer of control (e.g., handoff, TUNSIFPID, close in 1129 * parent). 1130 */ 1131 if (p->p_pid != tp->tun_pid) { 1132 log(LOG_INFO, 1133 "pid %d (%s), %s: tun/tap protocol violation, non-controlling process closed last.\n", 1134 p->p_pid, p->p_comm, tp->tun_dev->si_name); 1135 } 1136 1137 /* 1138 * junk all pending output 1139 */ 1140 CURVNET_SET(ifp->if_vnet); 1141 1142 l2tun = false; 1143 if ((tp->tun_flags & TUN_L2) != 0) { 1144 l2tun = true; 1145 IF_DRAIN(&ifp->if_snd); 1146 } else { 1147 IFQ_PURGE(&ifp->if_snd); 1148 } 1149 1150 /* For vmnet, we won't do most of the address/route bits */ 1151 if ((tp->tun_flags & TUN_VMNET) != 0 || 1152 (l2tun && (ifp->if_flags & IFF_LINK0) != 0)) 1153 goto out; 1154 1155 if (ifp->if_flags & IFF_UP) { 1156 TUN_UNLOCK(tp); 1157 if_down(ifp); 1158 TUN_LOCK(tp); 1159 } 1160 1161 /* Delete all addresses and routes which reference this interface. */ 1162 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1163 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1164 TUN_UNLOCK(tp); 1165 if_purgeaddrs(ifp); 1166 TUN_LOCK(tp); 1167 } 1168 1169out: 1170 if_link_state_change(ifp, LINK_STATE_DOWN); 1171 CURVNET_RESTORE(); 1172 1173 funsetown(&tp->tun_sigio); 1174 selwakeuppri(&tp->tun_rsel, PZERO + 1); 1175 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 1176 TUNDEBUG (ifp, "closed\n"); 1177 tp->tun_flags &= ~TUN_OPEN; 1178 tp->tun_pid = 0; 1179 tun_vnethdr_set(ifp, 0); 1180 1181 tun_unbusy_locked(tp); 1182 TUN_UNLOCK(tp); 1183} 1184 1185static void 1186tuninit(struct ifnet *ifp) 1187{ 1188 struct tuntap_softc *tp = ifp->if_softc; 1189 1190 TUNDEBUG(ifp, "tuninit\n"); 1191 1192 TUN_LOCK(tp); 1193 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1194 if ((tp->tun_flags & TUN_L2) == 0) { 1195 ifp->if_flags |= IFF_UP; 1196 getmicrotime(&ifp->if_lastchange); 1197 TUN_UNLOCK(tp); 1198 } else { 1199 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1200 TUN_UNLOCK(tp); 1201 /* attempt to start output */ 1202 tunstart_l2(ifp); 1203 } 1204 1205} 1206 1207/* 1208 * Used only for l2 tunnel. 1209 */ 1210static void 1211tunifinit(void *xtp) 1212{ 1213 struct tuntap_softc *tp; 1214 1215 tp = (struct tuntap_softc *)xtp; 1216 tuninit(tp->tun_ifp); 1217} 1218 1219/* 1220 * To be called under TUN_LOCK. Update ifp->if_hwassist according to the 1221 * current value of ifp->if_capenable. 1222 */ 1223static void 1224tun_caps_changed(struct ifnet *ifp) 1225{ 1226 uint64_t hwassist = 0; 1227 1228 TUN_LOCK_ASSERT((struct tuntap_softc *)ifp->if_softc); 1229 if (ifp->if_capenable & IFCAP_TXCSUM) 1230 hwassist |= CSUM_TCP | CSUM_UDP; 1231 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) 1232 hwassist |= CSUM_TCP_IPV6 1233 | CSUM_UDP_IPV6; 1234 if (ifp->if_capenable & IFCAP_TSO4) 1235 hwassist |= CSUM_IP_TSO; 1236 if (ifp->if_capenable & IFCAP_TSO6) 1237 hwassist |= CSUM_IP6_TSO; 1238 ifp->if_hwassist = hwassist; 1239} 1240 1241/* 1242 * To be called under TUN_LOCK. Update tp->tun_vhdrlen and adjust 1243 * if_capabilities and if_capenable as needed. 1244 */ 1245static void 1246tun_vnethdr_set(struct ifnet *ifp, int vhdrlen) 1247{ 1248 struct tuntap_softc *tp = ifp->if_softc; 1249 1250 TUN_LOCK_ASSERT(tp); 1251 1252 if (tp->tun_vhdrlen == vhdrlen) 1253 return; 1254 1255 /* 1256 * Update if_capabilities to reflect the 1257 * functionalities offered by the virtio-net 1258 * header. 1259 */ 1260 if (vhdrlen != 0) 1261 ifp->if_capabilities |= 1262 TAP_VNET_HDR_CAPS; 1263 else 1264 ifp->if_capabilities &= 1265 ~TAP_VNET_HDR_CAPS; 1266 /* 1267 * Disable any capabilities that we don't 1268 * support anymore. 1269 */ 1270 ifp->if_capenable &= ifp->if_capabilities; 1271 tun_caps_changed(ifp); 1272 tp->tun_vhdrlen = vhdrlen; 1273 1274 TUNDEBUG(ifp, "vnet_hdr_len=%d, if_capabilities=%x\n", 1275 vhdrlen, ifp->if_capabilities); 1276} 1277 1278/* 1279 * Process an ioctl request. 1280 */ 1281static int 1282tunifioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1283{ 1284 struct ifreq *ifr = (struct ifreq *)data; 1285 struct tuntap_softc *tp; 1286 struct ifstat *ifs; 1287 struct ifmediareq *ifmr; 1288 int dummy, error = 0; 1289 bool l2tun; 1290 1291 ifmr = NULL; 1292 sx_xlock(&tun_ioctl_sx); 1293 tp = ifp->if_softc; 1294 if (tp == NULL) { 1295 error = ENXIO; 1296 goto bad; 1297 } 1298 l2tun = (tp->tun_flags & TUN_L2) != 0; 1299 switch(cmd) { 1300 case SIOCGIFSTATUS: 1301 ifs = (struct ifstat *)data; 1302 TUN_LOCK(tp); 1303 if (tp->tun_pid) 1304 snprintf(ifs->ascii, sizeof(ifs->ascii), 1305 "\tOpened by PID %d\n", tp->tun_pid); 1306 else 1307 ifs->ascii[0] = '\0'; 1308 TUN_UNLOCK(tp); 1309 break; 1310 case SIOCSIFADDR: 1311 if (l2tun) 1312 error = ether_ioctl(ifp, cmd, data); 1313 else 1314 tuninit(ifp); 1315 if (error == 0) 1316 TUNDEBUG(ifp, "address set\n"); 1317 break; 1318 case SIOCSIFMTU: 1319 ifp->if_mtu = ifr->ifr_mtu; 1320 TUNDEBUG(ifp, "mtu set\n"); 1321 break; 1322 case SIOCSIFFLAGS: 1323 case SIOCADDMULTI: 1324 case SIOCDELMULTI: 1325 break; 1326 case SIOCGIFMEDIA: 1327 if (!l2tun) { 1328 error = EINVAL; 1329 break; 1330 } 1331 1332 ifmr = (struct ifmediareq *)data; 1333 dummy = ifmr->ifm_count; 1334 ifmr->ifm_count = 1; 1335 ifmr->ifm_status = IFM_AVALID; 1336 ifmr->ifm_active = IFM_ETHER; 1337 if (tp->tun_flags & TUN_OPEN) 1338 ifmr->ifm_status |= IFM_ACTIVE; 1339 ifmr->ifm_current = ifmr->ifm_active; 1340 if (dummy >= 1) { 1341 int media = IFM_ETHER; 1342 error = copyout(&media, ifmr->ifm_ulist, sizeof(int)); 1343 } 1344 break; 1345 case SIOCSIFCAP: 1346 TUN_LOCK(tp); 1347 ifp->if_capenable = ifr->ifr_reqcap; 1348 tun_caps_changed(ifp); 1349 TUN_UNLOCK(tp); 1350 VLAN_CAPABILITIES(ifp); 1351 break; 1352 default: 1353 if (l2tun) { 1354 error = ether_ioctl(ifp, cmd, data); 1355 } else { 1356 error = EINVAL; 1357 } 1358 } 1359bad: 1360 sx_xunlock(&tun_ioctl_sx); 1361 return (error); 1362} 1363 1364/* 1365 * tunoutput - queue packets from higher level ready to put out. 1366 */ 1367static int 1368tunoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 1369 struct route *ro) 1370{ 1371 struct tuntap_softc *tp = ifp->if_softc; 1372 u_short cached_tun_flags; 1373 int error; 1374 u_int32_t af; 1375 1376 TUNDEBUG (ifp, "tunoutput\n"); 1377 1378#ifdef MAC 1379 error = mac_ifnet_check_transmit(ifp, m0); 1380 if (error) { 1381 m_freem(m0); 1382 return (error); 1383 } 1384#endif 1385 1386 /* Could be unlocked read? */ 1387 TUN_LOCK(tp); 1388 cached_tun_flags = tp->tun_flags; 1389 TUN_UNLOCK(tp); 1390 if ((cached_tun_flags & TUN_READY) != TUN_READY) { 1391 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 1392 m_freem (m0); 1393 return (EHOSTDOWN); 1394 } 1395 1396 if ((ifp->if_flags & IFF_UP) != IFF_UP) { 1397 m_freem (m0); 1398 return (EHOSTDOWN); 1399 } 1400 1401 /* BPF writes need to be handled specially. */ 1402 if (dst->sa_family == AF_UNSPEC) 1403 bcopy(dst->sa_data, &af, sizeof(af)); 1404 else 1405 af = dst->sa_family; 1406 1407 if (bpf_peers_present(ifp->if_bpf)) 1408 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m0); 1409 1410 /* prepend sockaddr? this may abort if the mbuf allocation fails */ 1411 if (cached_tun_flags & TUN_LMODE) { 1412 /* allocate space for sockaddr */ 1413 M_PREPEND(m0, dst->sa_len, M_NOWAIT); 1414 1415 /* if allocation failed drop packet */ 1416 if (m0 == NULL) { 1417 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1); 1418 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 1419 return (ENOBUFS); 1420 } else { 1421 bcopy(dst, m0->m_data, dst->sa_len); 1422 } 1423 } 1424 1425 if (cached_tun_flags & TUN_IFHEAD) { 1426 /* Prepend the address family */ 1427 M_PREPEND(m0, 4, M_NOWAIT); 1428 1429 /* if allocation failed drop packet */ 1430 if (m0 == NULL) { 1431 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1); 1432 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 1433 return (ENOBUFS); 1434 } else 1435 *(u_int32_t *)m0->m_data = htonl(af); 1436 } else { 1437#ifdef INET 1438 if (af != AF_INET) 1439#endif 1440 { 1441 m_freem(m0); 1442 return (EAFNOSUPPORT); 1443 } 1444 } 1445 1446 error = (ifp->if_transmit)(ifp, m0); 1447 if (error) 1448 return (ENOBUFS); 1449 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 1450 return (0); 1451} 1452 1453/* 1454 * the cdevsw interface is now pretty minimal. 1455 */ 1456static int 1457tunioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, 1458 struct thread *td) 1459{ 1460 struct ifreq ifr, *ifrp; 1461 struct tuntap_softc *tp = dev->si_drv1; 1462 struct ifnet *ifp = TUN2IFP(tp); 1463 struct tuninfo *tunp; 1464 int error, iflags, ival; 1465 bool l2tun; 1466 1467 l2tun = (tp->tun_flags & TUN_L2) != 0; 1468 if (l2tun) { 1469 /* tap specific ioctls */ 1470 switch(cmd) { 1471 /* VMware/VMnet port ioctl's */ 1472#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 1473 defined(COMPAT_FREEBSD4) 1474 case _IO('V', 0): 1475 ival = IOCPARM_IVAL(data); 1476 data = (caddr_t)&ival; 1477 /* FALLTHROUGH */ 1478#endif 1479 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 1480 iflags = *(int *)data; 1481 iflags &= TUN_VMIO_FLAG_MASK; 1482 iflags &= ~IFF_CANTCHANGE; 1483 iflags |= IFF_UP; 1484 1485 TUN_LOCK(tp); 1486 ifp->if_flags = iflags | 1487 (ifp->if_flags & IFF_CANTCHANGE); 1488 TUN_UNLOCK(tp); 1489 1490 return (0); 1491 case SIOCGIFADDR: /* get MAC address of the remote side */ 1492 TUN_LOCK(tp); 1493 bcopy(&tp->tun_ether.octet, data, 1494 sizeof(tp->tun_ether.octet)); 1495 TUN_UNLOCK(tp); 1496 1497 return (0); 1498 case SIOCSIFADDR: /* set MAC address of the remote side */ 1499 TUN_LOCK(tp); 1500 bcopy(data, &tp->tun_ether.octet, 1501 sizeof(tp->tun_ether.octet)); 1502 TUN_UNLOCK(tp); 1503 1504 return (0); 1505 case TAPSVNETHDR: 1506 ival = *(int *)data; 1507 if (ival != 0 && 1508 ival != sizeof(struct virtio_net_hdr) && 1509 ival != sizeof(struct virtio_net_hdr_mrg_rxbuf)) { 1510 return (EINVAL); 1511 } 1512 TUN_LOCK(tp); 1513 tun_vnethdr_set(ifp, ival); 1514 TUN_UNLOCK(tp); 1515 1516 return (0); 1517 case TAPGVNETHDR: 1518 TUN_LOCK(tp); 1519 *(int *)data = tp->tun_vhdrlen; 1520 TUN_UNLOCK(tp); 1521 1522 return (0); 1523 } 1524 1525 /* Fall through to the common ioctls if unhandled */ 1526 } else { 1527 switch (cmd) { 1528 case TUNSLMODE: 1529 TUN_LOCK(tp); 1530 if (*(int *)data) { 1531 tp->tun_flags |= TUN_LMODE; 1532 tp->tun_flags &= ~TUN_IFHEAD; 1533 } else 1534 tp->tun_flags &= ~TUN_LMODE; 1535 TUN_UNLOCK(tp); 1536 1537 return (0); 1538 case TUNSIFHEAD: 1539 TUN_LOCK(tp); 1540 if (*(int *)data) { 1541 tp->tun_flags |= TUN_IFHEAD; 1542 tp->tun_flags &= ~TUN_LMODE; 1543 } else 1544 tp->tun_flags &= ~TUN_IFHEAD; 1545 TUN_UNLOCK(tp); 1546 1547 return (0); 1548 case TUNGIFHEAD: 1549 TUN_LOCK(tp); 1550 *(int *)data = (tp->tun_flags & TUN_IFHEAD) ? 1 : 0; 1551 TUN_UNLOCK(tp); 1552 1553 return (0); 1554 case TUNSIFMODE: 1555 /* deny this if UP */ 1556 if (TUN2IFP(tp)->if_flags & IFF_UP) 1557 return (EBUSY); 1558 1559 switch (*(int *)data & ~IFF_MULTICAST) { 1560 case IFF_POINTOPOINT: 1561 case IFF_BROADCAST: 1562 TUN_LOCK(tp); 1563 TUN2IFP(tp)->if_flags &= 1564 ~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST); 1565 TUN2IFP(tp)->if_flags |= *(int *)data; 1566 TUN_UNLOCK(tp); 1567 1568 break; 1569 default: 1570 return (EINVAL); 1571 } 1572 1573 return (0); 1574 case TUNSIFPID: 1575 TUN_LOCK(tp); 1576 tp->tun_pid = curthread->td_proc->p_pid; 1577 TUN_UNLOCK(tp); 1578 1579 return (0); 1580 } 1581 /* Fall through to the common ioctls if unhandled */ 1582 } 1583 1584 switch (cmd) { 1585 case TUNGIFNAME: 1586 ifrp = (struct ifreq *)data; 1587 strlcpy(ifrp->ifr_name, TUN2IFP(tp)->if_xname, IFNAMSIZ); 1588 1589 return (0); 1590 case TUNSIFINFO: 1591 tunp = (struct tuninfo *)data; 1592 if (TUN2IFP(tp)->if_type != tunp->type) 1593 return (EPROTOTYPE); 1594 TUN_LOCK(tp); 1595 if (TUN2IFP(tp)->if_mtu != tunp->mtu) { 1596 strlcpy(ifr.ifr_name, if_name(TUN2IFP(tp)), IFNAMSIZ); 1597 ifr.ifr_mtu = tunp->mtu; 1598 CURVNET_SET(TUN2IFP(tp)->if_vnet); 1599 error = ifhwioctl(SIOCSIFMTU, TUN2IFP(tp), 1600 (caddr_t)&ifr, td); 1601 CURVNET_RESTORE(); 1602 if (error) { 1603 TUN_UNLOCK(tp); 1604 return (error); 1605 } 1606 } 1607 TUN2IFP(tp)->if_baudrate = tunp->baudrate; 1608 TUN_UNLOCK(tp); 1609 break; 1610 case TUNGIFINFO: 1611 tunp = (struct tuninfo *)data; 1612 TUN_LOCK(tp); 1613 tunp->mtu = TUN2IFP(tp)->if_mtu; 1614 tunp->type = TUN2IFP(tp)->if_type; 1615 tunp->baudrate = TUN2IFP(tp)->if_baudrate; 1616 TUN_UNLOCK(tp); 1617 break; 1618 case TUNSDEBUG: 1619 tundebug = *(int *)data; 1620 break; 1621 case TUNGDEBUG: 1622 *(int *)data = tundebug; 1623 break; 1624 case FIONBIO: 1625 break; 1626 case FIOASYNC: 1627 TUN_LOCK(tp); 1628 if (*(int *)data) 1629 tp->tun_flags |= TUN_ASYNC; 1630 else 1631 tp->tun_flags &= ~TUN_ASYNC; 1632 TUN_UNLOCK(tp); 1633 break; 1634 case FIONREAD: 1635 if (!IFQ_IS_EMPTY(&TUN2IFP(tp)->if_snd)) { 1636 struct mbuf *mb; 1637 IFQ_LOCK(&TUN2IFP(tp)->if_snd); 1638 IFQ_POLL_NOLOCK(&TUN2IFP(tp)->if_snd, mb); 1639 for (*(int *)data = 0; mb != NULL; mb = mb->m_next) 1640 *(int *)data += mb->m_len; 1641 IFQ_UNLOCK(&TUN2IFP(tp)->if_snd); 1642 } else 1643 *(int *)data = 0; 1644 break; 1645 case FIOSETOWN: 1646 return (fsetown(*(int *)data, &tp->tun_sigio)); 1647 1648 case FIOGETOWN: 1649 *(int *)data = fgetown(&tp->tun_sigio); 1650 return (0); 1651 1652 /* This is deprecated, FIOSETOWN should be used instead. */ 1653 case TIOCSPGRP: 1654 return (fsetown(-(*(int *)data), &tp->tun_sigio)); 1655 1656 /* This is deprecated, FIOGETOWN should be used instead. */ 1657 case TIOCGPGRP: 1658 *(int *)data = -fgetown(&tp->tun_sigio); 1659 return (0); 1660 1661 default: 1662 return (ENOTTY); 1663 } 1664 return (0); 1665} 1666 1667/* 1668 * The cdevsw read interface - reads a packet at a time, or at 1669 * least as much of a packet as can be read. 1670 */ 1671static int 1672tunread(struct cdev *dev, struct uio *uio, int flag) 1673{ 1674 struct tuntap_softc *tp = dev->si_drv1; 1675 struct ifnet *ifp = TUN2IFP(tp); 1676 struct mbuf *m; 1677 size_t len; 1678 int error = 0; 1679 1680 TUNDEBUG (ifp, "read\n"); 1681 TUN_LOCK(tp); 1682 if ((tp->tun_flags & TUN_READY) != TUN_READY) { 1683 TUN_UNLOCK(tp); 1684 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 1685 return (EHOSTDOWN); 1686 } 1687 1688 tp->tun_flags &= ~TUN_RWAIT; 1689 1690 for (;;) { 1691 IFQ_DEQUEUE(&ifp->if_snd, m); 1692 if (m != NULL) 1693 break; 1694 if (flag & O_NONBLOCK) { 1695 TUN_UNLOCK(tp); 1696 return (EWOULDBLOCK); 1697 } 1698 tp->tun_flags |= TUN_RWAIT; 1699 error = mtx_sleep(tp, &tp->tun_mtx, PCATCH | (PZERO + 1), 1700 "tunread", 0); 1701 if (error != 0) { 1702 TUN_UNLOCK(tp); 1703 return (error); 1704 } 1705 } 1706 TUN_UNLOCK(tp); 1707 1708 if ((tp->tun_flags & TUN_L2) != 0) 1709 BPF_MTAP(ifp, m); 1710 1711 len = min(tp->tun_vhdrlen, uio->uio_resid); 1712 if (len > 0) { 1713 struct virtio_net_hdr_mrg_rxbuf vhdr; 1714 1715 bzero(&vhdr, sizeof(vhdr)); 1716 if (m->m_pkthdr.csum_flags & TAP_ALL_OFFLOAD) { 1717 m = virtio_net_tx_offload(ifp, m, false, &vhdr.hdr); 1718 } 1719 1720 TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, " 1721 "gs %u, cs %u, co %u\n", vhdr.hdr.flags, 1722 vhdr.hdr.gso_type, vhdr.hdr.hdr_len, 1723 vhdr.hdr.gso_size, vhdr.hdr.csum_start, 1724 vhdr.hdr.csum_offset); 1725 error = uiomove(&vhdr, len, uio); 1726 } 1727 1728 while (m && uio->uio_resid > 0 && error == 0) { 1729 len = min(uio->uio_resid, m->m_len); 1730 if (len != 0) 1731 error = uiomove(mtod(m, void *), len, uio); 1732 m = m_free(m); 1733 } 1734 1735 if (m) { 1736 TUNDEBUG(ifp, "Dropping mbuf\n"); 1737 m_freem(m); 1738 } 1739 return (error); 1740} 1741 1742static int 1743tunwrite_l2(struct tuntap_softc *tp, struct mbuf *m, 1744 struct virtio_net_hdr_mrg_rxbuf *vhdr) 1745{ 1746 struct epoch_tracker et; 1747 struct ether_header *eh; 1748 struct ifnet *ifp; 1749 1750 ifp = TUN2IFP(tp); 1751 1752 /* 1753 * Only pass a unicast frame to ether_input(), if it would 1754 * actually have been received by non-virtual hardware. 1755 */ 1756 if (m->m_len < sizeof(struct ether_header)) { 1757 m_freem(m); 1758 return (0); 1759 } 1760 1761 eh = mtod(m, struct ether_header *); 1762 1763 if (eh && (ifp->if_flags & IFF_PROMISC) == 0 && 1764 !ETHER_IS_MULTICAST(eh->ether_dhost) && 1765 bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) { 1766 m_freem(m); 1767 return (0); 1768 } 1769 1770 if (vhdr != NULL && virtio_net_rx_csum(m, &vhdr->hdr)) { 1771 m_freem(m); 1772 return (0); 1773 } 1774 1775 /* Pass packet up to parent. */ 1776 CURVNET_SET(ifp->if_vnet); 1777 NET_EPOCH_ENTER(et); 1778 (*ifp->if_input)(ifp, m); 1779 NET_EPOCH_EXIT(et); 1780 CURVNET_RESTORE(); 1781 /* ibytes are counted in parent */ 1782 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 1783 return (0); 1784} 1785 1786static int 1787tunwrite_l3(struct tuntap_softc *tp, struct mbuf *m) 1788{ 1789 struct epoch_tracker et; 1790 struct ifnet *ifp; 1791 int family, isr; 1792 1793 ifp = TUN2IFP(tp); 1794 /* Could be unlocked read? */ 1795 TUN_LOCK(tp); 1796 if (tp->tun_flags & TUN_IFHEAD) { 1797 TUN_UNLOCK(tp); 1798 if (m->m_len < sizeof(family) && 1799 (m = m_pullup(m, sizeof(family))) == NULL) 1800 return (ENOBUFS); 1801 family = ntohl(*mtod(m, u_int32_t *)); 1802 m_adj(m, sizeof(family)); 1803 } else { 1804 TUN_UNLOCK(tp); 1805 family = AF_INET; 1806 } 1807 1808 BPF_MTAP2(ifp, &family, sizeof(family), m); 1809 1810 switch (family) { 1811#ifdef INET 1812 case AF_INET: 1813 isr = NETISR_IP; 1814 break; 1815#endif 1816#ifdef INET6 1817 case AF_INET6: 1818 isr = NETISR_IPV6; 1819 break; 1820#endif 1821 default: 1822 m_freem(m); 1823 return (EAFNOSUPPORT); 1824 } 1825 random_harvest_queue(m, sizeof(*m), RANDOM_NET_TUN); 1826 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 1827 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 1828 CURVNET_SET(ifp->if_vnet); 1829 M_SETFIB(m, ifp->if_fib); 1830 NET_EPOCH_ENTER(et); 1831 netisr_dispatch(isr, m); 1832 NET_EPOCH_EXIT(et); 1833 CURVNET_RESTORE(); 1834 return (0); 1835} 1836 1837/* 1838 * the cdevsw write interface - an atomic write is a packet - or else! 1839 */ 1840static int 1841tunwrite(struct cdev *dev, struct uio *uio, int flag) 1842{ 1843 struct virtio_net_hdr_mrg_rxbuf vhdr; 1844 struct tuntap_softc *tp; 1845 struct ifnet *ifp; 1846 struct mbuf *m; 1847 uint32_t mru; 1848 int align, vhdrlen, error; 1849 bool l2tun; 1850 1851 tp = dev->si_drv1; 1852 ifp = TUN2IFP(tp); 1853 TUNDEBUG(ifp, "tunwrite\n"); 1854 if ((ifp->if_flags & IFF_UP) != IFF_UP) 1855 /* ignore silently */ 1856 return (0); 1857 1858 if (uio->uio_resid == 0) 1859 return (0); 1860 1861 l2tun = (tp->tun_flags & TUN_L2) != 0; 1862 mru = l2tun ? TAPMRU : TUNMRU; 1863 vhdrlen = tp->tun_vhdrlen; 1864 align = 0; 1865 if (l2tun) { 1866 align = ETHER_ALIGN; 1867 mru += vhdrlen; 1868 } else if ((tp->tun_flags & TUN_IFHEAD) != 0) 1869 mru += sizeof(uint32_t); /* family */ 1870 if (uio->uio_resid < 0 || uio->uio_resid > mru) { 1871 TUNDEBUG(ifp, "len=%zd!\n", uio->uio_resid); 1872 return (EIO); 1873 } 1874 1875 if (vhdrlen > 0) { 1876 error = uiomove(&vhdr, vhdrlen, uio); 1877 if (error != 0) 1878 return (error); 1879 TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, " 1880 "gs %u, cs %u, co %u\n", vhdr.hdr.flags, 1881 vhdr.hdr.gso_type, vhdr.hdr.hdr_len, 1882 vhdr.hdr.gso_size, vhdr.hdr.csum_start, 1883 vhdr.hdr.csum_offset); 1884 } 1885 1886 if ((m = m_uiotombuf(uio, M_NOWAIT, 0, align, M_PKTHDR)) == NULL) { 1887 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 1888 return (ENOBUFS); 1889 } 1890 1891 m->m_pkthdr.rcvif = ifp; 1892#ifdef MAC 1893 mac_ifnet_create_mbuf(ifp, m); 1894#endif 1895 1896 if (l2tun) 1897 return (tunwrite_l2(tp, m, vhdrlen > 0 ? &vhdr : NULL)); 1898 1899 return (tunwrite_l3(tp, m)); 1900} 1901 1902/* 1903 * tunpoll - the poll interface, this is only useful on reads 1904 * really. The write detect always returns true, write never blocks 1905 * anyway, it either accepts the packet or drops it. 1906 */ 1907static int 1908tunpoll(struct cdev *dev, int events, struct thread *td) 1909{ 1910 struct tuntap_softc *tp = dev->si_drv1; 1911 struct ifnet *ifp = TUN2IFP(tp); 1912 int revents = 0; 1913 1914 TUNDEBUG(ifp, "tunpoll\n"); 1915 1916 if (events & (POLLIN | POLLRDNORM)) { 1917 IFQ_LOCK(&ifp->if_snd); 1918 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 1919 TUNDEBUG(ifp, "tunpoll q=%d\n", ifp->if_snd.ifq_len); 1920 revents |= events & (POLLIN | POLLRDNORM); 1921 } else { 1922 TUNDEBUG(ifp, "tunpoll waiting\n"); 1923 selrecord(td, &tp->tun_rsel); 1924 } 1925 IFQ_UNLOCK(&ifp->if_snd); 1926 } 1927 revents |= events & (POLLOUT | POLLWRNORM); 1928 1929 return (revents); 1930} 1931 1932/* 1933 * tunkqfilter - support for the kevent() system call. 1934 */ 1935static int 1936tunkqfilter(struct cdev *dev, struct knote *kn) 1937{ 1938 struct tuntap_softc *tp = dev->si_drv1; 1939 struct ifnet *ifp = TUN2IFP(tp); 1940 1941 switch(kn->kn_filter) { 1942 case EVFILT_READ: 1943 TUNDEBUG(ifp, "%s kqfilter: EVFILT_READ, minor = %#x\n", 1944 ifp->if_xname, dev2unit(dev)); 1945 kn->kn_fop = &tun_read_filterops; 1946 break; 1947 1948 case EVFILT_WRITE: 1949 TUNDEBUG(ifp, "%s kqfilter: EVFILT_WRITE, minor = %#x\n", 1950 ifp->if_xname, dev2unit(dev)); 1951 kn->kn_fop = &tun_write_filterops; 1952 break; 1953 1954 default: 1955 TUNDEBUG(ifp, "%s kqfilter: invalid filter, minor = %#x\n", 1956 ifp->if_xname, dev2unit(dev)); 1957 return(EINVAL); 1958 } 1959 1960 kn->kn_hook = tp; 1961 knlist_add(&tp->tun_rsel.si_note, kn, 0); 1962 1963 return (0); 1964} 1965 1966/* 1967 * Return true of there is data in the interface queue. 1968 */ 1969static int 1970tunkqread(struct knote *kn, long hint) 1971{ 1972 int ret; 1973 struct tuntap_softc *tp = kn->kn_hook; 1974 struct cdev *dev = tp->tun_dev; 1975 struct ifnet *ifp = TUN2IFP(tp); 1976 1977 if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) { 1978 TUNDEBUG(ifp, 1979 "%s have data in the queue. Len = %d, minor = %#x\n", 1980 ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev)); 1981 ret = 1; 1982 } else { 1983 TUNDEBUG(ifp, 1984 "%s waiting for data, minor = %#x\n", ifp->if_xname, 1985 dev2unit(dev)); 1986 ret = 0; 1987 } 1988 1989 return (ret); 1990} 1991 1992/* 1993 * Always can write, always return MTU in kn->data. 1994 */ 1995static int 1996tunkqwrite(struct knote *kn, long hint) 1997{ 1998 struct tuntap_softc *tp = kn->kn_hook; 1999 struct ifnet *ifp = TUN2IFP(tp); 2000 2001 kn->kn_data = ifp->if_mtu; 2002 2003 return (1); 2004} 2005 2006static void 2007tunkqdetach(struct knote *kn) 2008{ 2009 struct tuntap_softc *tp = kn->kn_hook; 2010 2011 knlist_remove(&tp->tun_rsel.si_note, kn, 0); 2012} 2013