1/* $NetBSD: if_tun.c,v 1.14 1994/06/29 06:36:25 cgd Exp $ */ 2/*- 3 * SPDX-License-Identifier: BSD-2-Clause 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 47#include "opt_inet.h" 48#include "opt_inet6.h" 49 50#include <sys/param.h> 51#include <sys/lock.h> 52#include <sys/priv.h> 53#include <sys/proc.h> 54#include <sys/systm.h> 55#include <sys/jail.h> 56#include <sys/mbuf.h> 57#include <sys/module.h> 58#include <sys/socket.h> 59#include <sys/eventhandler.h> 60#include <sys/fcntl.h> 61#include <sys/filio.h> 62#include <sys/sockio.h> 63#include <sys/sx.h> 64#include <sys/syslog.h> 65#include <sys/ttycom.h> 66#include <sys/poll.h> 67#include <sys/selinfo.h> 68#include <sys/signalvar.h> 69#include <sys/filedesc.h> 70#include <sys/kernel.h> 71#include <sys/sysctl.h> 72#include <sys/conf.h> 73#include <sys/uio.h> 74#include <sys/malloc.h> 75#include <sys/random.h> 76#include <sys/ctype.h> 77 78#include <net/ethernet.h> 79#include <net/if.h> 80#include <net/if_var.h> 81#include <net/if_clone.h> 82#include <net/if_dl.h> 83#include <net/if_media.h> 84#include <net/if_private.h> 85#include <net/if_types.h> 86#include <net/if_vlan_var.h> 87#include <net/netisr.h> 88#include <net/route.h> 89#include <net/vnet.h> 90#include <netinet/in.h> 91#ifdef INET 92#include <netinet/ip.h> 93#endif 94#ifdef INET6 95#include <netinet/ip6.h> 96#include <netinet6/ip6_var.h> 97#endif 98#include <netinet/udp.h> 99#include <netinet/tcp.h> 100#include <netinet/tcp_lro.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 struct lro_ctrl tun_lro; /* for TCP LRO */ 149 bool tun_lro_ready; /* TCP LRO initialized */ 150}; 151#define TUN2IFP(sc) ((sc)->tun_ifp) 152 153#define TUNDEBUG if (tundebug) if_printf 154 155#define TUN_LOCK(tp) mtx_lock(&(tp)->tun_mtx) 156#define TUN_UNLOCK(tp) mtx_unlock(&(tp)->tun_mtx) 157#define TUN_LOCK_ASSERT(tp) mtx_assert(&(tp)->tun_mtx, MA_OWNED); 158 159#define TUN_VMIO_FLAG_MASK 0x0fff 160 161/* 162 * Interface capabilities of a tap device that supports the virtio-net 163 * header. 164 */ 165#define TAP_VNET_HDR_CAPS (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6 \ 166 | IFCAP_VLAN_HWCSUM \ 167 | IFCAP_TSO | IFCAP_LRO \ 168 | IFCAP_VLAN_HWTSO) 169 170#define TAP_ALL_OFFLOAD (CSUM_TSO | CSUM_TCP | CSUM_UDP |\ 171 CSUM_TCP_IPV6 | CSUM_UDP_IPV6) 172 173/* 174 * All mutable global variables in if_tun are locked using tunmtx, with 175 * the exception of tundebug, which is used unlocked, and the drivers' *clones, 176 * which are static after setup. 177 */ 178static struct mtx tunmtx; 179static eventhandler_tag arrival_tag; 180static eventhandler_tag clone_tag; 181static const char tunname[] = "tun"; 182static const char tapname[] = "tap"; 183static const char vmnetname[] = "vmnet"; 184static MALLOC_DEFINE(M_TUN, tunname, "Tunnel Interface"); 185static int tundebug = 0; 186static int tundclone = 1; 187static int tap_allow_uopen = 0; /* allow user devfs cloning */ 188static int tapuponopen = 0; /* IFF_UP on open() */ 189static int tapdclone = 1; /* enable devfs cloning */ 190 191static TAILQ_HEAD(,tuntap_softc) tunhead = TAILQ_HEAD_INITIALIZER(tunhead); 192SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, ""); 193 194static struct sx tun_ioctl_sx; 195SX_SYSINIT(tun_ioctl_sx, &tun_ioctl_sx, "tun_ioctl"); 196 197SYSCTL_DECL(_net_link); 198/* tun */ 199static SYSCTL_NODE(_net_link, OID_AUTO, tun, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 200 "IP tunnel software network interface"); 201SYSCTL_INT(_net_link_tun, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tundclone, 0, 202 "Enable legacy devfs interface creation"); 203 204/* tap */ 205static SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 206 "Ethernet tunnel software network interface"); 207SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tap_allow_uopen, 0, 208 "Enable legacy devfs interface creation for all users"); 209SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0, 210 "Bring interface up when /dev/tap is opened"); 211SYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tapdclone, 0, 212 "Enable legacy devfs interface creation"); 213SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tundebug, 0, ""); 214 215static int tun_create_device(struct tuntap_driver *drv, int unit, 216 struct ucred *cr, struct cdev **dev, const char *name); 217static int tun_busy_locked(struct tuntap_softc *tp); 218static void tun_unbusy_locked(struct tuntap_softc *tp); 219static int tun_busy(struct tuntap_softc *tp); 220static void tun_unbusy(struct tuntap_softc *tp); 221 222static int tuntap_name2info(const char *name, int *unit, int *flags); 223static void tunclone(void *arg, struct ucred *cred, char *name, 224 int namelen, struct cdev **dev); 225static void tuncreate(struct cdev *dev); 226static void tundtor(void *data); 227static void tunrename(void *arg, struct ifnet *ifp); 228static int tunifioctl(struct ifnet *, u_long, caddr_t); 229static void tuninit(struct ifnet *); 230static void tunifinit(void *xtp); 231static int tuntapmodevent(module_t, int, void *); 232static int tunoutput(struct ifnet *, struct mbuf *, 233 const struct sockaddr *, struct route *ro); 234static void tunstart(struct ifnet *); 235static void tunstart_l2(struct ifnet *); 236 237static int tun_clone_match(struct if_clone *ifc, const char *name); 238static int tap_clone_match(struct if_clone *ifc, const char *name); 239static int vmnet_clone_match(struct if_clone *ifc, const char *name); 240static int tun_clone_create(struct if_clone *, char *, size_t, 241 struct ifc_data *, struct ifnet **); 242static int tun_clone_destroy(struct if_clone *, struct ifnet *, uint32_t); 243static void tun_vnethdr_set(struct ifnet *ifp, int vhdrlen); 244 245static d_open_t tunopen; 246static d_read_t tunread; 247static d_write_t tunwrite; 248static d_ioctl_t tunioctl; 249static d_poll_t tunpoll; 250static d_kqfilter_t tunkqfilter; 251 252static int tunkqread(struct knote *, long); 253static int tunkqwrite(struct knote *, long); 254static void tunkqdetach(struct knote *); 255 256static struct filterops tun_read_filterops = { 257 .f_isfd = 1, 258 .f_attach = NULL, 259 .f_detach = tunkqdetach, 260 .f_event = tunkqread, 261}; 262 263static struct filterops tun_write_filterops = { 264 .f_isfd = 1, 265 .f_attach = NULL, 266 .f_detach = tunkqdetach, 267 .f_event = tunkqwrite, 268}; 269 270static struct tuntap_driver { 271 struct cdevsw cdevsw; 272 int ident_flags; 273 struct unrhdr *unrhdr; 274 struct clonedevs *clones; 275 ifc_match_f *clone_match_fn; 276 ifc_create_f *clone_create_fn; 277 ifc_destroy_f *clone_destroy_fn; 278} tuntap_drivers[] = { 279 { 280 .ident_flags = 0, 281 .cdevsw = { 282 .d_version = D_VERSION, 283 .d_flags = D_NEEDMINOR, 284 .d_open = tunopen, 285 .d_read = tunread, 286 .d_write = tunwrite, 287 .d_ioctl = tunioctl, 288 .d_poll = tunpoll, 289 .d_kqfilter = tunkqfilter, 290 .d_name = tunname, 291 }, 292 .clone_match_fn = tun_clone_match, 293 .clone_create_fn = tun_clone_create, 294 .clone_destroy_fn = tun_clone_destroy, 295 }, 296 { 297 .ident_flags = TUN_L2, 298 .cdevsw = { 299 .d_version = D_VERSION, 300 .d_flags = D_NEEDMINOR, 301 .d_open = tunopen, 302 .d_read = tunread, 303 .d_write = tunwrite, 304 .d_ioctl = tunioctl, 305 .d_poll = tunpoll, 306 .d_kqfilter = tunkqfilter, 307 .d_name = tapname, 308 }, 309 .clone_match_fn = tap_clone_match, 310 .clone_create_fn = tun_clone_create, 311 .clone_destroy_fn = tun_clone_destroy, 312 }, 313 { 314 .ident_flags = TUN_L2 | TUN_VMNET, 315 .cdevsw = { 316 .d_version = D_VERSION, 317 .d_flags = D_NEEDMINOR, 318 .d_open = tunopen, 319 .d_read = tunread, 320 .d_write = tunwrite, 321 .d_ioctl = tunioctl, 322 .d_poll = tunpoll, 323 .d_kqfilter = tunkqfilter, 324 .d_name = vmnetname, 325 }, 326 .clone_match_fn = vmnet_clone_match, 327 .clone_create_fn = tun_clone_create, 328 .clone_destroy_fn = tun_clone_destroy, 329 }, 330}; 331#define NDRV nitems(tuntap_drivers) 332 333VNET_DEFINE_STATIC(struct if_clone *, tuntap_driver_cloners[NDRV]); 334#define V_tuntap_driver_cloners VNET(tuntap_driver_cloners) 335 336/* 337 * Mechanism for marking a tunnel device as busy so that we can safely do some 338 * orthogonal operations (such as operations on devices) without racing against 339 * tun_destroy. tun_destroy will wait on the condvar if we're at all busy or 340 * open, to be woken up when the condition is alleviated. 341 */ 342static int 343tun_busy_locked(struct tuntap_softc *tp) 344{ 345 346 TUN_LOCK_ASSERT(tp); 347 if ((tp->tun_flags & TUN_DYING) != 0) { 348 /* 349 * Perhaps unintuitive, but the device is busy going away. 350 * Other interpretations of EBUSY from tun_busy make little 351 * sense, since making a busy device even more busy doesn't 352 * sound like a problem. 353 */ 354 return (EBUSY); 355 } 356 357 ++tp->tun_busy; 358 return (0); 359} 360 361static void 362tun_unbusy_locked(struct tuntap_softc *tp) 363{ 364 365 TUN_LOCK_ASSERT(tp); 366 KASSERT(tp->tun_busy != 0, ("tun_unbusy: called for non-busy tunnel")); 367 368 --tp->tun_busy; 369 /* Wake up anything that may be waiting on our busy tunnel. */ 370 if (tp->tun_busy == 0) 371 cv_broadcast(&tp->tun_cv); 372} 373 374static int 375tun_busy(struct tuntap_softc *tp) 376{ 377 int ret; 378 379 TUN_LOCK(tp); 380 ret = tun_busy_locked(tp); 381 TUN_UNLOCK(tp); 382 return (ret); 383} 384 385static void 386tun_unbusy(struct tuntap_softc *tp) 387{ 388 389 TUN_LOCK(tp); 390 tun_unbusy_locked(tp); 391 TUN_UNLOCK(tp); 392} 393 394/* 395 * Sets unit and/or flags given the device name. Must be called with correct 396 * vnet context. 397 */ 398static int 399tuntap_name2info(const char *name, int *outunit, int *outflags) 400{ 401 struct tuntap_driver *drv; 402 char *dname; 403 int flags, unit; 404 bool found; 405 406 if (name == NULL) 407 return (EINVAL); 408 409 /* 410 * Needed for dev_stdclone, but dev_stdclone will not modify, it just 411 * wants to be able to pass back a char * through the second param. We 412 * will always set that as NULL here, so we'll fake it. 413 */ 414 dname = __DECONST(char *, name); 415 found = false; 416 417 for (u_int i = 0; i < NDRV; i++) { 418 drv = &tuntap_drivers[i]; 419 420 if (strcmp(name, drv->cdevsw.d_name) == 0) { 421 found = true; 422 unit = -1; 423 flags = drv->ident_flags; 424 break; 425 } 426 427 if (dev_stdclone(dname, NULL, drv->cdevsw.d_name, &unit) == 1) { 428 found = true; 429 flags = drv->ident_flags; 430 break; 431 } 432 } 433 434 if (!found) 435 return (ENXIO); 436 437 if (outunit != NULL) 438 *outunit = unit; 439 if (outflags != NULL) 440 *outflags = flags; 441 return (0); 442} 443 444/* 445 * Get driver information from a set of flags specified. Masks the identifying 446 * part of the flags and compares it against all of the available 447 * tuntap_drivers. 448 */ 449static struct tuntap_driver * 450tuntap_driver_from_flags(int tun_flags) 451{ 452 453 for (u_int i = 0; i < NDRV; i++) 454 if ((tun_flags & TUN_DRIVER_IDENT_MASK) == 455 tuntap_drivers[i].ident_flags) 456 return (&tuntap_drivers[i]); 457 458 return (NULL); 459} 460 461static int 462tun_clone_match(struct if_clone *ifc, const char *name) 463{ 464 int tunflags; 465 466 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 467 if ((tunflags & TUN_L2) == 0) 468 return (1); 469 } 470 471 return (0); 472} 473 474static int 475tap_clone_match(struct if_clone *ifc, const char *name) 476{ 477 int tunflags; 478 479 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 480 if ((tunflags & (TUN_L2 | TUN_VMNET)) == TUN_L2) 481 return (1); 482 } 483 484 return (0); 485} 486 487static int 488vmnet_clone_match(struct if_clone *ifc, const char *name) 489{ 490 int tunflags; 491 492 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 493 if ((tunflags & TUN_VMNET) != 0) 494 return (1); 495 } 496 497 return (0); 498} 499 500static int 501tun_clone_create(struct if_clone *ifc, char *name, size_t len, 502 struct ifc_data *ifd, struct ifnet **ifpp) 503{ 504 struct tuntap_driver *drv; 505 struct cdev *dev; 506 int err, i, tunflags, unit; 507 508 tunflags = 0; 509 /* The name here tells us exactly what we're creating */ 510 err = tuntap_name2info(name, &unit, &tunflags); 511 if (err != 0) 512 return (err); 513 514 drv = tuntap_driver_from_flags(tunflags); 515 if (drv == NULL) 516 return (ENXIO); 517 518 if (unit != -1) { 519 /* If this unit number is still available that's okay. */ 520 if (alloc_unr_specific(drv->unrhdr, unit) == -1) 521 return (EEXIST); 522 } else { 523 unit = alloc_unr(drv->unrhdr); 524 } 525 526 snprintf(name, IFNAMSIZ, "%s%d", drv->cdevsw.d_name, unit); 527 528 /* find any existing device, or allocate new unit number */ 529 dev = NULL; 530 i = clone_create(&drv->clones, &drv->cdevsw, &unit, &dev, 0); 531 /* No preexisting struct cdev *, create one */ 532 if (i != 0) 533 i = tun_create_device(drv, unit, NULL, &dev, name); 534 if (i == 0) { 535 dev_ref(dev); 536 tuncreate(dev); 537 struct tuntap_softc *tp = dev->si_drv1; 538 *ifpp = tp->tun_ifp; 539 } 540 541 return (i); 542} 543 544static void 545tunclone(void *arg, struct ucred *cred, char *name, int namelen, 546 struct cdev **dev) 547{ 548 char devname[SPECNAMELEN + 1]; 549 struct tuntap_driver *drv; 550 int append_unit, i, u, tunflags; 551 bool mayclone; 552 553 if (*dev != NULL) 554 return; 555 556 tunflags = 0; 557 CURVNET_SET(CRED_TO_VNET(cred)); 558 if (tuntap_name2info(name, &u, &tunflags) != 0) 559 goto out; /* Not recognized */ 560 561 if (u != -1 && u > IF_MAXUNIT) 562 goto out; /* Unit number too high */ 563 564 mayclone = priv_check_cred(cred, PRIV_NET_IFCREATE) == 0; 565 if ((tunflags & TUN_L2) != 0) { 566 /* tap/vmnet allow user open with a sysctl */ 567 mayclone = (mayclone || tap_allow_uopen) && tapdclone; 568 } else { 569 mayclone = mayclone && tundclone; 570 } 571 572 /* 573 * If tun cloning is enabled, only the superuser can create an 574 * interface. 575 */ 576 if (!mayclone) 577 goto out; 578 579 if (u == -1) 580 append_unit = 1; 581 else 582 append_unit = 0; 583 584 drv = tuntap_driver_from_flags(tunflags); 585 if (drv == NULL) 586 goto out; 587 588 /* find any existing device, or allocate new unit number */ 589 i = clone_create(&drv->clones, &drv->cdevsw, &u, dev, 0); 590 if (i) { 591 if (append_unit) { 592 namelen = snprintf(devname, sizeof(devname), "%s%d", 593 name, u); 594 name = devname; 595 } 596 597 i = tun_create_device(drv, u, cred, dev, name); 598 } 599 if (i == 0) { 600 dev_ref(*dev); 601 if_clone_create(name, namelen, NULL); 602 } 603out: 604 CURVNET_RESTORE(); 605} 606 607static void 608tun_destroy(struct tuntap_softc *tp) 609{ 610 611 TUN_LOCK(tp); 612 tp->tun_flags |= TUN_DYING; 613 if (tp->tun_busy != 0) 614 cv_wait_unlock(&tp->tun_cv, &tp->tun_mtx); 615 else 616 TUN_UNLOCK(tp); 617 618 CURVNET_SET(TUN2IFP(tp)->if_vnet); 619 620 /* destroy_dev will take care of any alias. */ 621 destroy_dev(tp->tun_dev); 622 seldrain(&tp->tun_rsel); 623 knlist_clear(&tp->tun_rsel.si_note, 0); 624 knlist_destroy(&tp->tun_rsel.si_note); 625 if ((tp->tun_flags & TUN_L2) != 0) { 626 ether_ifdetach(TUN2IFP(tp)); 627 } else { 628 bpfdetach(TUN2IFP(tp)); 629 if_detach(TUN2IFP(tp)); 630 } 631 sx_xlock(&tun_ioctl_sx); 632 TUN2IFP(tp)->if_softc = NULL; 633 sx_xunlock(&tun_ioctl_sx); 634 free_unr(tp->tun_drv->unrhdr, TUN2IFP(tp)->if_dunit); 635 if_free(TUN2IFP(tp)); 636 mtx_destroy(&tp->tun_mtx); 637 cv_destroy(&tp->tun_cv); 638 free(tp, M_TUN); 639 CURVNET_RESTORE(); 640} 641 642static int 643tun_clone_destroy(struct if_clone *ifc __unused, struct ifnet *ifp, uint32_t flags) 644{ 645 struct tuntap_softc *tp = ifp->if_softc; 646 647 mtx_lock(&tunmtx); 648 TAILQ_REMOVE(&tunhead, tp, tun_list); 649 mtx_unlock(&tunmtx); 650 tun_destroy(tp); 651 652 return (0); 653} 654 655static void 656vnet_tun_init(const void *unused __unused) 657{ 658 659 for (u_int i = 0; i < NDRV; ++i) { 660 struct if_clone_addreq req = { 661 .match_f = tuntap_drivers[i].clone_match_fn, 662 .create_f = tuntap_drivers[i].clone_create_fn, 663 .destroy_f = tuntap_drivers[i].clone_destroy_fn, 664 }; 665 V_tuntap_driver_cloners[i] = 666 ifc_attach_cloner(tuntap_drivers[i].cdevsw.d_name, &req); 667 }; 668} 669VNET_SYSINIT(vnet_tun_init, SI_SUB_PROTO_IF, SI_ORDER_ANY, 670 vnet_tun_init, NULL); 671 672static void 673vnet_tun_uninit(const void *unused __unused) 674{ 675 676 for (u_int i = 0; i < NDRV; ++i) 677 if_clone_detach(V_tuntap_driver_cloners[i]); 678} 679VNET_SYSUNINIT(vnet_tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY, 680 vnet_tun_uninit, NULL); 681 682static void 683tun_uninit(const void *unused __unused) 684{ 685 struct tuntap_driver *drv; 686 struct tuntap_softc *tp; 687 int i; 688 689 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, arrival_tag); 690 EVENTHANDLER_DEREGISTER(dev_clone, clone_tag); 691 692 mtx_lock(&tunmtx); 693 while ((tp = TAILQ_FIRST(&tunhead)) != NULL) { 694 TAILQ_REMOVE(&tunhead, tp, tun_list); 695 mtx_unlock(&tunmtx); 696 tun_destroy(tp); 697 mtx_lock(&tunmtx); 698 } 699 mtx_unlock(&tunmtx); 700 for (i = 0; i < nitems(tuntap_drivers); ++i) { 701 drv = &tuntap_drivers[i]; 702 delete_unrhdr(drv->unrhdr); 703 clone_cleanup(&drv->clones); 704 } 705 mtx_destroy(&tunmtx); 706} 707SYSUNINIT(tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY, tun_uninit, NULL); 708 709static struct tuntap_driver * 710tuntap_driver_from_ifnet(const struct ifnet *ifp) 711{ 712 struct tuntap_driver *drv; 713 int i; 714 715 if (ifp == NULL) 716 return (NULL); 717 718 for (i = 0; i < nitems(tuntap_drivers); ++i) { 719 drv = &tuntap_drivers[i]; 720 if (strcmp(ifp->if_dname, drv->cdevsw.d_name) == 0) 721 return (drv); 722 } 723 724 return (NULL); 725} 726 727static int 728tuntapmodevent(module_t mod, int type, void *data) 729{ 730 struct tuntap_driver *drv; 731 int i; 732 733 switch (type) { 734 case MOD_LOAD: 735 mtx_init(&tunmtx, "tunmtx", NULL, MTX_DEF); 736 for (i = 0; i < nitems(tuntap_drivers); ++i) { 737 drv = &tuntap_drivers[i]; 738 clone_setup(&drv->clones); 739 drv->unrhdr = new_unrhdr(0, IF_MAXUNIT, &tunmtx); 740 } 741 arrival_tag = EVENTHANDLER_REGISTER(ifnet_arrival_event, 742 tunrename, 0, 1000); 743 if (arrival_tag == NULL) 744 return (ENOMEM); 745 clone_tag = EVENTHANDLER_REGISTER(dev_clone, tunclone, 0, 1000); 746 if (clone_tag == NULL) 747 return (ENOMEM); 748 break; 749 case MOD_UNLOAD: 750 /* See tun_uninit, so it's done after the vnet_sysuninit() */ 751 break; 752 default: 753 return EOPNOTSUPP; 754 } 755 return 0; 756} 757 758static moduledata_t tuntap_mod = { 759 "if_tuntap", 760 tuntapmodevent, 761 0 762}; 763 764/* We'll only ever have these two, so no need for a macro. */ 765static moduledata_t tun_mod = { "if_tun", NULL, 0 }; 766static moduledata_t tap_mod = { "if_tap", NULL, 0 }; 767 768DECLARE_MODULE(if_tuntap, tuntap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 769MODULE_VERSION(if_tuntap, 1); 770DECLARE_MODULE(if_tun, tun_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 771MODULE_VERSION(if_tun, 1); 772DECLARE_MODULE(if_tap, tap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 773MODULE_VERSION(if_tap, 1); 774 775static int 776tun_create_device(struct tuntap_driver *drv, int unit, struct ucred *cr, 777 struct cdev **dev, const char *name) 778{ 779 struct make_dev_args args; 780 struct tuntap_softc *tp; 781 int error; 782 783 tp = malloc(sizeof(*tp), M_TUN, M_WAITOK | M_ZERO); 784 mtx_init(&tp->tun_mtx, "tun_mtx", NULL, MTX_DEF); 785 cv_init(&tp->tun_cv, "tun_condvar"); 786 tp->tun_flags = drv->ident_flags; 787 tp->tun_drv = drv; 788 789 make_dev_args_init(&args); 790 if (cr != NULL) 791 args.mda_flags = MAKEDEV_REF | MAKEDEV_CHECKNAME; 792 args.mda_devsw = &drv->cdevsw; 793 args.mda_cr = cr; 794 args.mda_uid = UID_UUCP; 795 args.mda_gid = GID_DIALER; 796 args.mda_mode = 0600; 797 args.mda_unit = unit; 798 args.mda_si_drv1 = tp; 799 error = make_dev_s(&args, dev, "%s", name); 800 if (error != 0) { 801 free(tp, M_TUN); 802 return (error); 803 } 804 805 KASSERT((*dev)->si_drv1 != NULL, 806 ("Failed to set si_drv1 at %s creation", name)); 807 tp->tun_dev = *dev; 808 knlist_init_mtx(&tp->tun_rsel.si_note, &tp->tun_mtx); 809 mtx_lock(&tunmtx); 810 TAILQ_INSERT_TAIL(&tunhead, tp, tun_list); 811 mtx_unlock(&tunmtx); 812 return (0); 813} 814 815static void 816tunstart(struct ifnet *ifp) 817{ 818 struct tuntap_softc *tp = ifp->if_softc; 819 struct mbuf *m; 820 821 TUNDEBUG(ifp, "starting\n"); 822 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 823 IFQ_LOCK(&ifp->if_snd); 824 IFQ_POLL_NOLOCK(&ifp->if_snd, m); 825 if (m == NULL) { 826 IFQ_UNLOCK(&ifp->if_snd); 827 return; 828 } 829 IFQ_UNLOCK(&ifp->if_snd); 830 } 831 832 TUN_LOCK(tp); 833 if (tp->tun_flags & TUN_RWAIT) { 834 tp->tun_flags &= ~TUN_RWAIT; 835 wakeup(tp); 836 } 837 selwakeuppri(&tp->tun_rsel, PZERO + 1); 838 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 839 if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio) { 840 TUN_UNLOCK(tp); 841 pgsigio(&tp->tun_sigio, SIGIO, 0); 842 } else 843 TUN_UNLOCK(tp); 844} 845 846/* 847 * tunstart_l2 848 * 849 * queue packets from higher level ready to put out 850 */ 851static void 852tunstart_l2(struct ifnet *ifp) 853{ 854 struct tuntap_softc *tp = ifp->if_softc; 855 856 TUNDEBUG(ifp, "starting\n"); 857 858 /* 859 * do not junk pending output if we are in VMnet mode. 860 * XXX: can this do any harm because of queue overflow? 861 */ 862 863 TUN_LOCK(tp); 864 if (((tp->tun_flags & TUN_VMNET) == 0) && 865 ((tp->tun_flags & TUN_READY) != TUN_READY)) { 866 struct mbuf *m; 867 868 /* Unlocked read. */ 869 TUNDEBUG(ifp, "not ready, tun_flags = 0x%x\n", tp->tun_flags); 870 871 for (;;) { 872 IF_DEQUEUE(&ifp->if_snd, m); 873 if (m != NULL) { 874 m_freem(m); 875 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 876 } else 877 break; 878 } 879 TUN_UNLOCK(tp); 880 881 return; 882 } 883 884 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 885 886 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 887 if (tp->tun_flags & TUN_RWAIT) { 888 tp->tun_flags &= ~TUN_RWAIT; 889 wakeup(tp); 890 } 891 892 if ((tp->tun_flags & TUN_ASYNC) && (tp->tun_sigio != NULL)) { 893 TUN_UNLOCK(tp); 894 pgsigio(&tp->tun_sigio, SIGIO, 0); 895 TUN_LOCK(tp); 896 } 897 898 selwakeuppri(&tp->tun_rsel, PZERO+1); 899 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 900 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); /* obytes are counted in ether_output */ 901 } 902 903 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 904 TUN_UNLOCK(tp); 905} /* tunstart_l2 */ 906 907static int 908tap_transmit(struct ifnet *ifp, struct mbuf *m) 909{ 910 int error; 911 912 BPF_MTAP(ifp, m); 913 IFQ_HANDOFF(ifp, m, error); 914 return (error); 915} 916 917/* XXX: should return an error code so it can fail. */ 918static void 919tuncreate(struct cdev *dev) 920{ 921 struct tuntap_driver *drv; 922 struct tuntap_softc *tp; 923 struct ifnet *ifp; 924 struct ether_addr eaddr; 925 int iflags; 926 u_char type; 927 928 tp = dev->si_drv1; 929 KASSERT(tp != NULL, 930 ("si_drv1 should have been initialized at creation")); 931 932 drv = tp->tun_drv; 933 iflags = IFF_MULTICAST; 934 if ((tp->tun_flags & TUN_L2) != 0) { 935 type = IFT_ETHER; 936 iflags |= IFF_BROADCAST | IFF_SIMPLEX; 937 } else { 938 type = IFT_PPP; 939 iflags |= IFF_POINTOPOINT; 940 } 941 ifp = tp->tun_ifp = if_alloc(type); 942 if (ifp == NULL) 943 panic("%s%d: failed to if_alloc() interface.\n", 944 drv->cdevsw.d_name, dev2unit(dev)); 945 ifp->if_softc = tp; 946 if_initname(ifp, drv->cdevsw.d_name, dev2unit(dev)); 947 ifp->if_ioctl = tunifioctl; 948 ifp->if_flags = iflags; 949 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 950 ifp->if_capabilities |= IFCAP_LINKSTATE; 951 if ((tp->tun_flags & TUN_L2) != 0) 952 ifp->if_capabilities |= 953 IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO; 954 ifp->if_capenable |= IFCAP_LINKSTATE; 955 956 if ((tp->tun_flags & TUN_L2) != 0) { 957 ifp->if_init = tunifinit; 958 ifp->if_start = tunstart_l2; 959 ifp->if_transmit = tap_transmit; 960 ifp->if_qflush = if_qflush; 961 962 ether_gen_addr(ifp, &eaddr); 963 ether_ifattach(ifp, eaddr.octet); 964 } else { 965 ifp->if_mtu = TUNMTU; 966 ifp->if_start = tunstart; 967 ifp->if_output = tunoutput; 968 969 ifp->if_snd.ifq_drv_maxlen = 0; 970 IFQ_SET_READY(&ifp->if_snd); 971 972 if_attach(ifp); 973 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 974 } 975 976 TUN_LOCK(tp); 977 tp->tun_flags |= TUN_INITED; 978 TUN_UNLOCK(tp); 979 980 TUNDEBUG(ifp, "interface %s is created, minor = %#x\n", 981 ifp->if_xname, dev2unit(dev)); 982} 983 984static void 985tunrename(void *arg __unused, struct ifnet *ifp) 986{ 987 struct tuntap_softc *tp; 988 int error; 989 990 if ((ifp->if_flags & IFF_RENAMING) == 0) 991 return; 992 993 if (tuntap_driver_from_ifnet(ifp) == NULL) 994 return; 995 996 /* 997 * We need to grab the ioctl sx long enough to make sure the softc is 998 * still there. If it is, we can safely try to busy the tun device. 999 * The busy may fail if the device is currently dying, in which case 1000 * we do nothing. If it doesn't fail, the busy count stops the device 1001 * from dying until we've created the alias (that will then be 1002 * subsequently destroyed). 1003 */ 1004 sx_xlock(&tun_ioctl_sx); 1005 tp = ifp->if_softc; 1006 if (tp == NULL) { 1007 sx_xunlock(&tun_ioctl_sx); 1008 return; 1009 } 1010 error = tun_busy(tp); 1011 sx_xunlock(&tun_ioctl_sx); 1012 if (error != 0) 1013 return; 1014 if (tp->tun_alias != NULL) { 1015 destroy_dev(tp->tun_alias); 1016 tp->tun_alias = NULL; 1017 } 1018 1019 if (strcmp(ifp->if_xname, tp->tun_dev->si_name) == 0) 1020 goto out; 1021 1022 /* 1023 * Failure's ok, aliases are created on a best effort basis. If a 1024 * tun user/consumer decides to rename the interface to conflict with 1025 * another device (non-ifnet) on the system, we will assume they know 1026 * what they are doing. make_dev_alias_p won't touch tun_alias on 1027 * failure, so we use it but ignore the return value. 1028 */ 1029 make_dev_alias_p(MAKEDEV_CHECKNAME, &tp->tun_alias, tp->tun_dev, "%s", 1030 ifp->if_xname); 1031out: 1032 tun_unbusy(tp); 1033} 1034 1035static int 1036tunopen(struct cdev *dev, int flag, int mode, struct thread *td) 1037{ 1038 struct ifnet *ifp; 1039 struct tuntap_softc *tp; 1040 int error __diagused, tunflags; 1041 1042 tunflags = 0; 1043 CURVNET_SET(TD_TO_VNET(td)); 1044 error = tuntap_name2info(dev->si_name, NULL, &tunflags); 1045 if (error != 0) { 1046 CURVNET_RESTORE(); 1047 return (error); /* Shouldn't happen */ 1048 } 1049 1050 tp = dev->si_drv1; 1051 KASSERT(tp != NULL, 1052 ("si_drv1 should have been initialized at creation")); 1053 1054 TUN_LOCK(tp); 1055 if ((tp->tun_flags & TUN_INITED) == 0) { 1056 TUN_UNLOCK(tp); 1057 CURVNET_RESTORE(); 1058 return (ENXIO); 1059 } 1060 if ((tp->tun_flags & (TUN_OPEN | TUN_DYING)) != 0) { 1061 TUN_UNLOCK(tp); 1062 CURVNET_RESTORE(); 1063 return (EBUSY); 1064 } 1065 1066 error = tun_busy_locked(tp); 1067 KASSERT(error == 0, ("Must be able to busy an unopen tunnel")); 1068 ifp = TUN2IFP(tp); 1069 1070 if ((tp->tun_flags & TUN_L2) != 0) { 1071 bcopy(IF_LLADDR(ifp), tp->tun_ether.octet, 1072 sizeof(tp->tun_ether.octet)); 1073 1074 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1075 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1076 1077 if (tapuponopen) 1078 ifp->if_flags |= IFF_UP; 1079 } 1080 1081 tp->tun_pid = td->td_proc->p_pid; 1082 tp->tun_flags |= TUN_OPEN; 1083 1084 if_link_state_change(ifp, LINK_STATE_UP); 1085 TUNDEBUG(ifp, "open\n"); 1086 TUN_UNLOCK(tp); 1087 1088 /* 1089 * This can fail with either ENOENT or EBUSY. This is in the middle of 1090 * d_open, so ENOENT should not be possible. EBUSY is possible, but 1091 * the only cdevpriv dtor being set will be tundtor and the softc being 1092 * passed is constant for a given cdev. We ignore the possible error 1093 * because of this as either "unlikely" or "not actually a problem." 1094 */ 1095 (void)devfs_set_cdevpriv(tp, tundtor); 1096 CURVNET_RESTORE(); 1097 return (0); 1098} 1099 1100/* 1101 * tundtor - tear down the device - mark i/f down & delete 1102 * routing info 1103 */ 1104static void 1105tundtor(void *data) 1106{ 1107 struct proc *p; 1108 struct tuntap_softc *tp; 1109 struct ifnet *ifp; 1110 bool l2tun; 1111 1112 tp = data; 1113 p = curproc; 1114 ifp = TUN2IFP(tp); 1115 1116 TUN_LOCK(tp); 1117 1118 /* 1119 * Realistically, we can't be obstinate here. This only means that the 1120 * tuntap device was closed out of order, and the last closer wasn't the 1121 * controller. These are still good to know about, though, as software 1122 * should avoid multiple processes with a tuntap device open and 1123 * ill-defined transfer of control (e.g., handoff, TUNSIFPID, close in 1124 * parent). 1125 */ 1126 if (p->p_pid != tp->tun_pid) { 1127 log(LOG_INFO, 1128 "pid %d (%s), %s: tun/tap protocol violation, non-controlling process closed last.\n", 1129 p->p_pid, p->p_comm, tp->tun_dev->si_name); 1130 } 1131 1132 /* 1133 * junk all pending output 1134 */ 1135 CURVNET_SET(ifp->if_vnet); 1136 1137 l2tun = false; 1138 if ((tp->tun_flags & TUN_L2) != 0) { 1139 l2tun = true; 1140 IF_DRAIN(&ifp->if_snd); 1141 } else { 1142 IFQ_PURGE(&ifp->if_snd); 1143 } 1144 1145 /* For vmnet, we won't do most of the address/route bits */ 1146 if ((tp->tun_flags & TUN_VMNET) != 0 || 1147 (l2tun && (ifp->if_flags & IFF_LINK0) != 0)) 1148 goto out; 1149#if defined(INET) || defined(INET6) 1150 if (l2tun && tp->tun_lro_ready) { 1151 TUNDEBUG (ifp, "LRO disabled\n"); 1152 tcp_lro_free(&tp->tun_lro); 1153 tp->tun_lro_ready = false; 1154 } 1155#endif 1156 if (ifp->if_flags & IFF_UP) { 1157 TUN_UNLOCK(tp); 1158 if_down(ifp); 1159 TUN_LOCK(tp); 1160 } 1161 1162 /* Delete all addresses and routes which reference this interface. */ 1163 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1164 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1165 TUN_UNLOCK(tp); 1166 if_purgeaddrs(ifp); 1167 TUN_LOCK(tp); 1168 } 1169 1170out: 1171 if_link_state_change(ifp, LINK_STATE_DOWN); 1172 CURVNET_RESTORE(); 1173 1174 funsetown(&tp->tun_sigio); 1175 selwakeuppri(&tp->tun_rsel, PZERO + 1); 1176 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 1177 TUNDEBUG (ifp, "closed\n"); 1178 tp->tun_flags &= ~TUN_OPEN; 1179 tp->tun_pid = 0; 1180 tun_vnethdr_set(ifp, 0); 1181 1182 tun_unbusy_locked(tp); 1183 TUN_UNLOCK(tp); 1184} 1185 1186static void 1187tuninit(struct ifnet *ifp) 1188{ 1189 struct tuntap_softc *tp = ifp->if_softc; 1190 1191 TUNDEBUG(ifp, "tuninit\n"); 1192 1193 TUN_LOCK(tp); 1194 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1195 if ((tp->tun_flags & TUN_L2) == 0) { 1196 ifp->if_flags |= IFF_UP; 1197 getmicrotime(&ifp->if_lastchange); 1198 TUN_UNLOCK(tp); 1199 } else { 1200#if defined(INET) || defined(INET6) 1201 if (tcp_lro_init(&tp->tun_lro) == 0) { 1202 TUNDEBUG(ifp, "LRO enabled\n"); 1203 tp->tun_lro.ifp = ifp; 1204 tp->tun_lro_ready = true; 1205 } else { 1206 TUNDEBUG(ifp, "Could not enable LRO\n"); 1207 tp->tun_lro_ready = false; 1208 } 1209#endif 1210 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1211 TUN_UNLOCK(tp); 1212 /* attempt to start output */ 1213 tunstart_l2(ifp); 1214 } 1215 1216} 1217 1218/* 1219 * Used only for l2 tunnel. 1220 */ 1221static void 1222tunifinit(void *xtp) 1223{ 1224 struct tuntap_softc *tp; 1225 1226 tp = (struct tuntap_softc *)xtp; 1227 tuninit(tp->tun_ifp); 1228} 1229 1230/* 1231 * To be called under TUN_LOCK. Update ifp->if_hwassist according to the 1232 * current value of ifp->if_capenable. 1233 */ 1234static void 1235tun_caps_changed(struct ifnet *ifp) 1236{ 1237 uint64_t hwassist = 0; 1238 1239 TUN_LOCK_ASSERT((struct tuntap_softc *)ifp->if_softc); 1240 if (ifp->if_capenable & IFCAP_TXCSUM) 1241 hwassist |= CSUM_TCP | CSUM_UDP; 1242 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) 1243 hwassist |= CSUM_TCP_IPV6 1244 | CSUM_UDP_IPV6; 1245 if (ifp->if_capenable & IFCAP_TSO4) 1246 hwassist |= CSUM_IP_TSO; 1247 if (ifp->if_capenable & IFCAP_TSO6) 1248 hwassist |= CSUM_IP6_TSO; 1249 ifp->if_hwassist = hwassist; 1250} 1251 1252/* 1253 * To be called under TUN_LOCK. Update tp->tun_vhdrlen and adjust 1254 * if_capabilities and if_capenable as needed. 1255 */ 1256static void 1257tun_vnethdr_set(struct ifnet *ifp, int vhdrlen) 1258{ 1259 struct tuntap_softc *tp = ifp->if_softc; 1260 1261 TUN_LOCK_ASSERT(tp); 1262 1263 if (tp->tun_vhdrlen == vhdrlen) 1264 return; 1265 1266 /* 1267 * Update if_capabilities to reflect the 1268 * functionalities offered by the virtio-net 1269 * header. 1270 */ 1271 if (vhdrlen != 0) 1272 ifp->if_capabilities |= 1273 TAP_VNET_HDR_CAPS; 1274 else 1275 ifp->if_capabilities &= 1276 ~TAP_VNET_HDR_CAPS; 1277 /* 1278 * Disable any capabilities that we don't 1279 * support anymore. 1280 */ 1281 ifp->if_capenable &= ifp->if_capabilities; 1282 tun_caps_changed(ifp); 1283 tp->tun_vhdrlen = vhdrlen; 1284 1285 TUNDEBUG(ifp, "vnet_hdr_len=%d, if_capabilities=%x\n", 1286 vhdrlen, ifp->if_capabilities); 1287} 1288 1289/* 1290 * Process an ioctl request. 1291 */ 1292static int 1293tunifioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1294{ 1295 struct ifreq *ifr = (struct ifreq *)data; 1296 struct tuntap_softc *tp; 1297 struct ifstat *ifs; 1298 struct ifmediareq *ifmr; 1299 int dummy, error = 0; 1300 bool l2tun; 1301 1302 ifmr = NULL; 1303 sx_xlock(&tun_ioctl_sx); 1304 tp = ifp->if_softc; 1305 if (tp == NULL) { 1306 error = ENXIO; 1307 goto bad; 1308 } 1309 l2tun = (tp->tun_flags & TUN_L2) != 0; 1310 switch(cmd) { 1311 case SIOCGIFSTATUS: 1312 ifs = (struct ifstat *)data; 1313 TUN_LOCK(tp); 1314 if (tp->tun_pid) 1315 snprintf(ifs->ascii, sizeof(ifs->ascii), 1316 "\tOpened by PID %d\n", tp->tun_pid); 1317 else 1318 ifs->ascii[0] = '\0'; 1319 TUN_UNLOCK(tp); 1320 break; 1321 case SIOCSIFADDR: 1322 if (l2tun) 1323 error = ether_ioctl(ifp, cmd, data); 1324 else 1325 tuninit(ifp); 1326 if (error == 0) 1327 TUNDEBUG(ifp, "address set\n"); 1328 break; 1329 case SIOCSIFMTU: 1330 ifp->if_mtu = ifr->ifr_mtu; 1331 TUNDEBUG(ifp, "mtu set\n"); 1332 break; 1333 case SIOCSIFFLAGS: 1334 case SIOCADDMULTI: 1335 case SIOCDELMULTI: 1336 break; 1337 case SIOCGIFMEDIA: 1338 if (!l2tun) { 1339 error = EINVAL; 1340 break; 1341 } 1342 1343 ifmr = (struct ifmediareq *)data; 1344 dummy = ifmr->ifm_count; 1345 ifmr->ifm_count = 1; 1346 ifmr->ifm_status = IFM_AVALID; 1347 ifmr->ifm_active = IFM_ETHER | IFM_FDX | IFM_1000_T; 1348 if (tp->tun_flags & TUN_OPEN) 1349 ifmr->ifm_status |= IFM_ACTIVE; 1350 ifmr->ifm_current = ifmr->ifm_active; 1351 if (dummy >= 1) { 1352 int media = IFM_ETHER; 1353 error = copyout(&media, ifmr->ifm_ulist, sizeof(int)); 1354 } 1355 break; 1356 case SIOCSIFCAP: 1357 TUN_LOCK(tp); 1358 ifp->if_capenable = ifr->ifr_reqcap; 1359 tun_caps_changed(ifp); 1360 TUN_UNLOCK(tp); 1361 VLAN_CAPABILITIES(ifp); 1362 break; 1363 default: 1364 if (l2tun) { 1365 error = ether_ioctl(ifp, cmd, data); 1366 } else { 1367 error = EINVAL; 1368 } 1369 } 1370bad: 1371 sx_xunlock(&tun_ioctl_sx); 1372 return (error); 1373} 1374 1375/* 1376 * tunoutput - queue packets from higher level ready to put out. 1377 */ 1378static int 1379tunoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 1380 struct route *ro) 1381{ 1382 struct tuntap_softc *tp = ifp->if_softc; 1383 u_short cached_tun_flags; 1384 int error; 1385 u_int32_t af; 1386 1387 TUNDEBUG (ifp, "tunoutput\n"); 1388 1389#ifdef MAC 1390 error = mac_ifnet_check_transmit(ifp, m0); 1391 if (error) { 1392 m_freem(m0); 1393 return (error); 1394 } 1395#endif 1396 1397 /* Could be unlocked read? */ 1398 TUN_LOCK(tp); 1399 cached_tun_flags = tp->tun_flags; 1400 TUN_UNLOCK(tp); 1401 if ((cached_tun_flags & TUN_READY) != TUN_READY) { 1402 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 1403 m_freem (m0); 1404 return (EHOSTDOWN); 1405 } 1406 1407 if ((ifp->if_flags & IFF_UP) != IFF_UP) { 1408 m_freem (m0); 1409 return (EHOSTDOWN); 1410 } 1411 1412 /* BPF writes need to be handled specially. */ 1413 if (dst->sa_family == AF_UNSPEC || dst->sa_family == pseudo_AF_HDRCMPLT) 1414 bcopy(dst->sa_data, &af, sizeof(af)); 1415 else 1416 af = RO_GET_FAMILY(ro, dst); 1417 1418 BPF_MTAP2(ifp, &af, sizeof(af), m0); 1419 1420 /* prepend sockaddr? this may abort if the mbuf allocation fails */ 1421 if (cached_tun_flags & TUN_LMODE) { 1422 /* allocate space for sockaddr */ 1423 M_PREPEND(m0, dst->sa_len, M_NOWAIT); 1424 1425 /* if allocation failed drop packet */ 1426 if (m0 == NULL) { 1427 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1); 1428 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 1429 return (ENOBUFS); 1430 } else { 1431 bcopy(dst, m0->m_data, dst->sa_len); 1432 } 1433 } 1434 1435 if (cached_tun_flags & TUN_IFHEAD) { 1436 /* Prepend the address family */ 1437 M_PREPEND(m0, 4, M_NOWAIT); 1438 1439 /* if allocation failed drop packet */ 1440 if (m0 == NULL) { 1441 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1); 1442 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 1443 return (ENOBUFS); 1444 } else 1445 *(u_int32_t *)m0->m_data = htonl(af); 1446 } else { 1447#ifdef INET 1448 if (af != AF_INET) 1449#endif 1450 { 1451 m_freem(m0); 1452 return (EAFNOSUPPORT); 1453 } 1454 } 1455 1456 error = (ifp->if_transmit)(ifp, m0); 1457 if (error) 1458 return (ENOBUFS); 1459 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 1460 return (0); 1461} 1462 1463/* 1464 * the cdevsw interface is now pretty minimal. 1465 */ 1466static int 1467tunioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, 1468 struct thread *td) 1469{ 1470 struct ifreq ifr, *ifrp; 1471 struct tuntap_softc *tp = dev->si_drv1; 1472 struct ifnet *ifp = TUN2IFP(tp); 1473 struct tuninfo *tunp; 1474 int error, iflags, ival; 1475 bool l2tun; 1476 1477 l2tun = (tp->tun_flags & TUN_L2) != 0; 1478 if (l2tun) { 1479 /* tap specific ioctls */ 1480 switch(cmd) { 1481 /* VMware/VMnet port ioctl's */ 1482#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 1483 defined(COMPAT_FREEBSD4) 1484 case _IO('V', 0): 1485 ival = IOCPARM_IVAL(data); 1486 data = (caddr_t)&ival; 1487 /* FALLTHROUGH */ 1488#endif 1489 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 1490 iflags = *(int *)data; 1491 iflags &= TUN_VMIO_FLAG_MASK; 1492 iflags &= ~IFF_CANTCHANGE; 1493 iflags |= IFF_UP; 1494 1495 TUN_LOCK(tp); 1496 ifp->if_flags = iflags | 1497 (ifp->if_flags & IFF_CANTCHANGE); 1498 TUN_UNLOCK(tp); 1499 1500 return (0); 1501 case SIOCGIFADDR: /* get MAC address of the remote side */ 1502 TUN_LOCK(tp); 1503 bcopy(&tp->tun_ether.octet, data, 1504 sizeof(tp->tun_ether.octet)); 1505 TUN_UNLOCK(tp); 1506 1507 return (0); 1508 case SIOCSIFADDR: /* set MAC address of the remote side */ 1509 TUN_LOCK(tp); 1510 bcopy(data, &tp->tun_ether.octet, 1511 sizeof(tp->tun_ether.octet)); 1512 TUN_UNLOCK(tp); 1513 1514 return (0); 1515 case TAPSVNETHDR: 1516 ival = *(int *)data; 1517 if (ival != 0 && 1518 ival != sizeof(struct virtio_net_hdr) && 1519 ival != sizeof(struct virtio_net_hdr_mrg_rxbuf)) { 1520 return (EINVAL); 1521 } 1522 TUN_LOCK(tp); 1523 tun_vnethdr_set(ifp, ival); 1524 TUN_UNLOCK(tp); 1525 1526 return (0); 1527 case TAPGVNETHDR: 1528 TUN_LOCK(tp); 1529 *(int *)data = tp->tun_vhdrlen; 1530 TUN_UNLOCK(tp); 1531 1532 return (0); 1533 } 1534 1535 /* Fall through to the common ioctls if unhandled */ 1536 } else { 1537 switch (cmd) { 1538 case TUNSLMODE: 1539 TUN_LOCK(tp); 1540 if (*(int *)data) { 1541 tp->tun_flags |= TUN_LMODE; 1542 tp->tun_flags &= ~TUN_IFHEAD; 1543 } else 1544 tp->tun_flags &= ~TUN_LMODE; 1545 TUN_UNLOCK(tp); 1546 1547 return (0); 1548 case TUNSIFHEAD: 1549 TUN_LOCK(tp); 1550 if (*(int *)data) { 1551 tp->tun_flags |= TUN_IFHEAD; 1552 tp->tun_flags &= ~TUN_LMODE; 1553 } else 1554 tp->tun_flags &= ~TUN_IFHEAD; 1555 TUN_UNLOCK(tp); 1556 1557 return (0); 1558 case TUNGIFHEAD: 1559 TUN_LOCK(tp); 1560 *(int *)data = (tp->tun_flags & TUN_IFHEAD) ? 1 : 0; 1561 TUN_UNLOCK(tp); 1562 1563 return (0); 1564 case TUNSIFMODE: 1565 /* deny this if UP */ 1566 if (TUN2IFP(tp)->if_flags & IFF_UP) 1567 return (EBUSY); 1568 1569 switch (*(int *)data & ~IFF_MULTICAST) { 1570 case IFF_POINTOPOINT: 1571 case IFF_BROADCAST: 1572 TUN_LOCK(tp); 1573 TUN2IFP(tp)->if_flags &= 1574 ~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST); 1575 TUN2IFP(tp)->if_flags |= *(int *)data; 1576 TUN_UNLOCK(tp); 1577 1578 break; 1579 default: 1580 return (EINVAL); 1581 } 1582 1583 return (0); 1584 case TUNSIFPID: 1585 TUN_LOCK(tp); 1586 tp->tun_pid = curthread->td_proc->p_pid; 1587 TUN_UNLOCK(tp); 1588 1589 return (0); 1590 } 1591 /* Fall through to the common ioctls if unhandled */ 1592 } 1593 1594 switch (cmd) { 1595 case TUNGIFNAME: 1596 ifrp = (struct ifreq *)data; 1597 strlcpy(ifrp->ifr_name, TUN2IFP(tp)->if_xname, IFNAMSIZ); 1598 1599 return (0); 1600 case TUNSIFINFO: 1601 tunp = (struct tuninfo *)data; 1602 if (TUN2IFP(tp)->if_type != tunp->type) 1603 return (EPROTOTYPE); 1604 TUN_LOCK(tp); 1605 if (TUN2IFP(tp)->if_mtu != tunp->mtu) { 1606 strlcpy(ifr.ifr_name, if_name(TUN2IFP(tp)), IFNAMSIZ); 1607 ifr.ifr_mtu = tunp->mtu; 1608 CURVNET_SET(TUN2IFP(tp)->if_vnet); 1609 error = ifhwioctl(SIOCSIFMTU, TUN2IFP(tp), 1610 (caddr_t)&ifr, td); 1611 CURVNET_RESTORE(); 1612 if (error) { 1613 TUN_UNLOCK(tp); 1614 return (error); 1615 } 1616 } 1617 TUN2IFP(tp)->if_baudrate = tunp->baudrate; 1618 TUN_UNLOCK(tp); 1619 break; 1620 case TUNGIFINFO: 1621 tunp = (struct tuninfo *)data; 1622 TUN_LOCK(tp); 1623 tunp->mtu = TUN2IFP(tp)->if_mtu; 1624 tunp->type = TUN2IFP(tp)->if_type; 1625 tunp->baudrate = TUN2IFP(tp)->if_baudrate; 1626 TUN_UNLOCK(tp); 1627 break; 1628 case TUNSDEBUG: 1629 tundebug = *(int *)data; 1630 break; 1631 case TUNGDEBUG: 1632 *(int *)data = tundebug; 1633 break; 1634 case FIONBIO: 1635 break; 1636 case FIOASYNC: 1637 TUN_LOCK(tp); 1638 if (*(int *)data) 1639 tp->tun_flags |= TUN_ASYNC; 1640 else 1641 tp->tun_flags &= ~TUN_ASYNC; 1642 TUN_UNLOCK(tp); 1643 break; 1644 case FIONREAD: 1645 if (!IFQ_IS_EMPTY(&TUN2IFP(tp)->if_snd)) { 1646 struct mbuf *mb; 1647 IFQ_LOCK(&TUN2IFP(tp)->if_snd); 1648 IFQ_POLL_NOLOCK(&TUN2IFP(tp)->if_snd, mb); 1649 for (*(int *)data = 0; mb != NULL; mb = mb->m_next) 1650 *(int *)data += mb->m_len; 1651 IFQ_UNLOCK(&TUN2IFP(tp)->if_snd); 1652 } else 1653 *(int *)data = 0; 1654 break; 1655 case FIOSETOWN: 1656 return (fsetown(*(int *)data, &tp->tun_sigio)); 1657 1658 case FIOGETOWN: 1659 *(int *)data = fgetown(&tp->tun_sigio); 1660 return (0); 1661 1662 /* This is deprecated, FIOSETOWN should be used instead. */ 1663 case TIOCSPGRP: 1664 return (fsetown(-(*(int *)data), &tp->tun_sigio)); 1665 1666 /* This is deprecated, FIOGETOWN should be used instead. */ 1667 case TIOCGPGRP: 1668 *(int *)data = -fgetown(&tp->tun_sigio); 1669 return (0); 1670 1671 default: 1672 return (ENOTTY); 1673 } 1674 return (0); 1675} 1676 1677/* 1678 * The cdevsw read interface - reads a packet at a time, or at 1679 * least as much of a packet as can be read. 1680 */ 1681static int 1682tunread(struct cdev *dev, struct uio *uio, int flag) 1683{ 1684 struct tuntap_softc *tp = dev->si_drv1; 1685 struct ifnet *ifp = TUN2IFP(tp); 1686 struct mbuf *m; 1687 size_t len; 1688 int error = 0; 1689 1690 TUNDEBUG (ifp, "read\n"); 1691 TUN_LOCK(tp); 1692 if ((tp->tun_flags & TUN_READY) != TUN_READY) { 1693 TUN_UNLOCK(tp); 1694 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 1695 return (EHOSTDOWN); 1696 } 1697 1698 tp->tun_flags &= ~TUN_RWAIT; 1699 1700 for (;;) { 1701 IFQ_DEQUEUE(&ifp->if_snd, m); 1702 if (m != NULL) 1703 break; 1704 if (flag & O_NONBLOCK) { 1705 TUN_UNLOCK(tp); 1706 return (EWOULDBLOCK); 1707 } 1708 tp->tun_flags |= TUN_RWAIT; 1709 error = mtx_sleep(tp, &tp->tun_mtx, PCATCH | (PZERO + 1), 1710 "tunread", 0); 1711 if (error != 0) { 1712 TUN_UNLOCK(tp); 1713 return (error); 1714 } 1715 } 1716 TUN_UNLOCK(tp); 1717 1718 len = min(tp->tun_vhdrlen, uio->uio_resid); 1719 if (len > 0) { 1720 struct virtio_net_hdr_mrg_rxbuf vhdr; 1721 1722 bzero(&vhdr, sizeof(vhdr)); 1723 if (m->m_pkthdr.csum_flags & TAP_ALL_OFFLOAD) { 1724 m = virtio_net_tx_offload(ifp, m, false, &vhdr.hdr); 1725 } 1726 1727 TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, " 1728 "gs %u, cs %u, co %u\n", vhdr.hdr.flags, 1729 vhdr.hdr.gso_type, vhdr.hdr.hdr_len, 1730 vhdr.hdr.gso_size, vhdr.hdr.csum_start, 1731 vhdr.hdr.csum_offset); 1732 error = uiomove(&vhdr, len, uio); 1733 } 1734 1735 while (m && uio->uio_resid > 0 && error == 0) { 1736 len = min(uio->uio_resid, m->m_len); 1737 if (len != 0) 1738 error = uiomove(mtod(m, void *), len, uio); 1739 m = m_free(m); 1740 } 1741 1742 if (m) { 1743 TUNDEBUG(ifp, "Dropping mbuf\n"); 1744 m_freem(m); 1745 } 1746 return (error); 1747} 1748 1749static int 1750tunwrite_l2(struct tuntap_softc *tp, struct mbuf *m, 1751 struct virtio_net_hdr_mrg_rxbuf *vhdr) 1752{ 1753 struct epoch_tracker et; 1754 struct ether_header *eh; 1755 struct ifnet *ifp; 1756 1757 ifp = TUN2IFP(tp); 1758 1759 /* 1760 * Only pass a unicast frame to ether_input(), if it would 1761 * actually have been received by non-virtual hardware. 1762 */ 1763 if (m->m_len < sizeof(struct ether_header)) { 1764 m_freem(m); 1765 return (0); 1766 } 1767 1768 eh = mtod(m, struct ether_header *); 1769 1770 if ((ifp->if_flags & IFF_PROMISC) == 0 && 1771 !ETHER_IS_MULTICAST(eh->ether_dhost) && 1772 bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) { 1773 m_freem(m); 1774 return (0); 1775 } 1776 1777 if (vhdr != NULL) { 1778 if (virtio_net_rx_csum(m, &vhdr->hdr)) { 1779 m_freem(m); 1780 return (0); 1781 } 1782 } else { 1783 switch (ntohs(eh->ether_type)) { 1784#ifdef INET 1785 case ETHERTYPE_IP: 1786 if (ifp->if_capenable & IFCAP_RXCSUM) { 1787 m->m_pkthdr.csum_flags |= 1788 CSUM_IP_CHECKED | CSUM_IP_VALID | 1789 CSUM_DATA_VALID | CSUM_SCTP_VALID | 1790 CSUM_PSEUDO_HDR; 1791 m->m_pkthdr.csum_data = 0xffff; 1792 } 1793 break; 1794#endif 1795#ifdef INET6 1796 case ETHERTYPE_IPV6: 1797 if (ifp->if_capenable & IFCAP_RXCSUM_IPV6) { 1798 m->m_pkthdr.csum_flags |= 1799 CSUM_DATA_VALID_IPV6 | CSUM_SCTP_VALID | 1800 CSUM_PSEUDO_HDR; 1801 m->m_pkthdr.csum_data = 0xffff; 1802 } 1803 break; 1804#endif 1805 } 1806 } 1807 1808 /* Pass packet up to parent. */ 1809 CURVNET_SET(ifp->if_vnet); 1810 NET_EPOCH_ENTER(et); 1811#if defined(INET) || defined(INET6) 1812 if (tp->tun_lro_ready && ifp->if_capenable & IFCAP_LRO && 1813 tcp_lro_rx(&tp->tun_lro, m, 0) == 0) 1814 tcp_lro_flush_all(&tp->tun_lro); 1815 else 1816#endif 1817 (*ifp->if_input)(ifp, m); 1818 NET_EPOCH_EXIT(et); 1819 CURVNET_RESTORE(); 1820 /* ibytes are counted in parent */ 1821 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 1822 return (0); 1823} 1824 1825static int 1826tunwrite_l3(struct tuntap_softc *tp, struct mbuf *m) 1827{ 1828 struct epoch_tracker et; 1829 struct ifnet *ifp; 1830 int family, isr; 1831 1832 ifp = TUN2IFP(tp); 1833 /* Could be unlocked read? */ 1834 TUN_LOCK(tp); 1835 if (tp->tun_flags & TUN_IFHEAD) { 1836 TUN_UNLOCK(tp); 1837 if (m->m_len < sizeof(family) && 1838 (m = m_pullup(m, sizeof(family))) == NULL) 1839 return (ENOBUFS); 1840 family = ntohl(*mtod(m, u_int32_t *)); 1841 m_adj(m, sizeof(family)); 1842 } else { 1843 TUN_UNLOCK(tp); 1844 family = AF_INET; 1845 } 1846 1847 BPF_MTAP2(ifp, &family, sizeof(family), m); 1848 1849 switch (family) { 1850#ifdef INET 1851 case AF_INET: 1852 isr = NETISR_IP; 1853 break; 1854#endif 1855#ifdef INET6 1856 case AF_INET6: 1857 isr = NETISR_IPV6; 1858 break; 1859#endif 1860 default: 1861 m_freem(m); 1862 return (EAFNOSUPPORT); 1863 } 1864 random_harvest_queue(m, sizeof(*m), RANDOM_NET_TUN); 1865 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 1866 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 1867 CURVNET_SET(ifp->if_vnet); 1868 M_SETFIB(m, ifp->if_fib); 1869 NET_EPOCH_ENTER(et); 1870 netisr_dispatch(isr, m); 1871 NET_EPOCH_EXIT(et); 1872 CURVNET_RESTORE(); 1873 return (0); 1874} 1875 1876/* 1877 * the cdevsw write interface - an atomic write is a packet - or else! 1878 */ 1879static int 1880tunwrite(struct cdev *dev, struct uio *uio, int flag) 1881{ 1882 struct virtio_net_hdr_mrg_rxbuf vhdr; 1883 struct tuntap_softc *tp; 1884 struct ifnet *ifp; 1885 struct mbuf *m; 1886 uint32_t mru; 1887 int align, vhdrlen, error; 1888 bool l2tun; 1889 1890 tp = dev->si_drv1; 1891 ifp = TUN2IFP(tp); 1892 TUNDEBUG(ifp, "tunwrite\n"); 1893 if ((ifp->if_flags & IFF_UP) != IFF_UP) 1894 /* ignore silently */ 1895 return (0); 1896 1897 if (uio->uio_resid == 0) 1898 return (0); 1899 1900 l2tun = (tp->tun_flags & TUN_L2) != 0; 1901 mru = l2tun ? TAPMRU : TUNMRU; 1902 vhdrlen = tp->tun_vhdrlen; 1903 align = 0; 1904 if (l2tun) { 1905 align = ETHER_ALIGN; 1906 mru += vhdrlen; 1907 } else if ((tp->tun_flags & TUN_IFHEAD) != 0) 1908 mru += sizeof(uint32_t); /* family */ 1909 if (uio->uio_resid < 0 || uio->uio_resid > mru) { 1910 TUNDEBUG(ifp, "len=%zd!\n", uio->uio_resid); 1911 return (EIO); 1912 } 1913 1914 if (vhdrlen > 0) { 1915 error = uiomove(&vhdr, vhdrlen, uio); 1916 if (error != 0) 1917 return (error); 1918 TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, " 1919 "gs %u, cs %u, co %u\n", vhdr.hdr.flags, 1920 vhdr.hdr.gso_type, vhdr.hdr.hdr_len, 1921 vhdr.hdr.gso_size, vhdr.hdr.csum_start, 1922 vhdr.hdr.csum_offset); 1923 } 1924 1925 if ((m = m_uiotombuf(uio, M_NOWAIT, 0, align, M_PKTHDR)) == NULL) { 1926 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 1927 return (ENOBUFS); 1928 } 1929 1930 m->m_pkthdr.rcvif = ifp; 1931#ifdef MAC 1932 mac_ifnet_create_mbuf(ifp, m); 1933#endif 1934 1935 if (l2tun) 1936 return (tunwrite_l2(tp, m, vhdrlen > 0 ? &vhdr : NULL)); 1937 1938 return (tunwrite_l3(tp, m)); 1939} 1940 1941/* 1942 * tunpoll - the poll interface, this is only useful on reads 1943 * really. The write detect always returns true, write never blocks 1944 * anyway, it either accepts the packet or drops it. 1945 */ 1946static int 1947tunpoll(struct cdev *dev, int events, struct thread *td) 1948{ 1949 struct tuntap_softc *tp = dev->si_drv1; 1950 struct ifnet *ifp = TUN2IFP(tp); 1951 int revents = 0; 1952 1953 TUNDEBUG(ifp, "tunpoll\n"); 1954 1955 if (events & (POLLIN | POLLRDNORM)) { 1956 IFQ_LOCK(&ifp->if_snd); 1957 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 1958 TUNDEBUG(ifp, "tunpoll q=%d\n", ifp->if_snd.ifq_len); 1959 revents |= events & (POLLIN | POLLRDNORM); 1960 } else { 1961 TUNDEBUG(ifp, "tunpoll waiting\n"); 1962 selrecord(td, &tp->tun_rsel); 1963 } 1964 IFQ_UNLOCK(&ifp->if_snd); 1965 } 1966 revents |= events & (POLLOUT | POLLWRNORM); 1967 1968 return (revents); 1969} 1970 1971/* 1972 * tunkqfilter - support for the kevent() system call. 1973 */ 1974static int 1975tunkqfilter(struct cdev *dev, struct knote *kn) 1976{ 1977 struct tuntap_softc *tp = dev->si_drv1; 1978 struct ifnet *ifp = TUN2IFP(tp); 1979 1980 switch(kn->kn_filter) { 1981 case EVFILT_READ: 1982 TUNDEBUG(ifp, "%s kqfilter: EVFILT_READ, minor = %#x\n", 1983 ifp->if_xname, dev2unit(dev)); 1984 kn->kn_fop = &tun_read_filterops; 1985 break; 1986 1987 case EVFILT_WRITE: 1988 TUNDEBUG(ifp, "%s kqfilter: EVFILT_WRITE, minor = %#x\n", 1989 ifp->if_xname, dev2unit(dev)); 1990 kn->kn_fop = &tun_write_filterops; 1991 break; 1992 1993 default: 1994 TUNDEBUG(ifp, "%s kqfilter: invalid filter, minor = %#x\n", 1995 ifp->if_xname, dev2unit(dev)); 1996 return(EINVAL); 1997 } 1998 1999 kn->kn_hook = tp; 2000 knlist_add(&tp->tun_rsel.si_note, kn, 0); 2001 2002 return (0); 2003} 2004 2005/* 2006 * Return true of there is data in the interface queue. 2007 */ 2008static int 2009tunkqread(struct knote *kn, long hint) 2010{ 2011 int ret; 2012 struct tuntap_softc *tp = kn->kn_hook; 2013 struct cdev *dev = tp->tun_dev; 2014 struct ifnet *ifp = TUN2IFP(tp); 2015 2016 if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) { 2017 TUNDEBUG(ifp, 2018 "%s have data in the queue. Len = %d, minor = %#x\n", 2019 ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev)); 2020 ret = 1; 2021 } else { 2022 TUNDEBUG(ifp, 2023 "%s waiting for data, minor = %#x\n", ifp->if_xname, 2024 dev2unit(dev)); 2025 ret = 0; 2026 } 2027 2028 return (ret); 2029} 2030 2031/* 2032 * Always can write, always return MTU in kn->data. 2033 */ 2034static int 2035tunkqwrite(struct knote *kn, long hint) 2036{ 2037 struct tuntap_softc *tp = kn->kn_hook; 2038 struct ifnet *ifp = TUN2IFP(tp); 2039 2040 kn->kn_data = ifp->if_mtu; 2041 2042 return (1); 2043} 2044 2045static void 2046tunkqdetach(struct knote *kn) 2047{ 2048 struct tuntap_softc *tp = kn->kn_hook; 2049 2050 knlist_remove(&tp->tun_rsel.si_note, kn, 0); 2051} 2052