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> 110 111 struct 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 */ 118 struct 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 */ 176 static struct mtx tunmtx; 177 static eventhandler_tag arrival_tag; 178 static eventhandler_tag clone_tag; 179 static const char tunname[] = "tun"; 180 static const char tapname[] = "tap"; 181 static const char vmnetname[] = "vmnet"; 182 static MALLOC_DEFINE(M_TUN, tunname, "Tunnel Interface"); 183 static int tundebug = 0; 184 static int tundclone = 1; 185 static int tap_allow_uopen = 0; /* allow user devfs cloning */ 186 static int tapuponopen = 0; /* IFF_UP on open() */ 187 static int tapdclone = 1; /* enable devfs cloning */ 188 189 static TAILQ_HEAD(,tuntap_softc) tunhead = TAILQ_HEAD_INITIALIZER(tunhead); 190 SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, ""); 191 192 static struct sx tun_ioctl_sx; 193 SX_SYSINIT(tun_ioctl_sx, &tun_ioctl_sx, "tun_ioctl"); 194 195 SYSCTL_DECL(_net_link); 196 /* tun */ 197 static SYSCTL_NODE(_net_link, OID_AUTO, tun, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 198 "IP tunnel software network interface"); 199 SYSCTL_INT(_net_link_tun, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tundclone, 0, 200 "Enable legacy devfs interface creation"); 201 202 /* tap */ 203 static SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 204 "Ethernet tunnel software network interface"); 205 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tap_allow_uopen, 0, 206 "Enable legacy devfs interface creation for all users"); 207 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0, 208 "Bring interface up when /dev/tap is opened"); 209 SYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tapdclone, 0, 210 "Enable legacy devfs interface creation"); 211 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tundebug, 0, ""); 212 213 static int tun_create_device(struct tuntap_driver *drv, int unit, 214 struct ucred *cr, struct cdev **dev, const char *name); 215 static int tun_busy_locked(struct tuntap_softc *tp); 216 static void tun_unbusy_locked(struct tuntap_softc *tp); 217 static int tun_busy(struct tuntap_softc *tp); 218 static void tun_unbusy(struct tuntap_softc *tp); 219 220 static int tuntap_name2info(const char *name, int *unit, int *flags); 221 static void tunclone(void *arg, struct ucred *cred, char *name, 222 int namelen, struct cdev **dev); 223 static void tuncreate(struct cdev *dev); 224 static void tundtor(void *data); 225 static void tunrename(void *arg, struct ifnet *ifp); 226 static int tunifioctl(struct ifnet *, u_long, caddr_t); 227 static void tuninit(struct ifnet *); 228 static void tunifinit(void *xtp); 229 static int tuntapmodevent(module_t, int, void *); 230 static int tunoutput(struct ifnet *, struct mbuf *, 231 const struct sockaddr *, struct route *ro); 232 static void tunstart(struct ifnet *); 233 static void tunstart_l2(struct ifnet *); 234 235 static int tun_clone_match(struct if_clone *ifc, const char *name); 236 static int tap_clone_match(struct if_clone *ifc, const char *name); 237 static int vmnet_clone_match(struct if_clone *ifc, const char *name); 238 static int tun_clone_create(struct if_clone *, char *, size_t, 239 struct ifc_data *, struct ifnet **); 240 static int tun_clone_destroy(struct if_clone *, struct ifnet *, uint32_t); 241 static void tun_vnethdr_set(struct ifnet *ifp, int vhdrlen); 242 243 static d_open_t tunopen; 244 static d_read_t tunread; 245 static d_write_t tunwrite; 246 static d_ioctl_t tunioctl; 247 static d_poll_t tunpoll; 248 static d_kqfilter_t tunkqfilter; 249 250 static int tunkqread(struct knote *, long); 251 static int tunkqwrite(struct knote *, long); 252 static void tunkqdetach(struct knote *); 253 254 static struct filterops tun_read_filterops = { 255 .f_isfd = 1, 256 .f_attach = NULL, 257 .f_detach = tunkqdetach, 258 .f_event = tunkqread, 259 }; 260 261 static struct filterops tun_write_filterops = { 262 .f_isfd = 1, 263 .f_attach = NULL, 264 .f_detach = tunkqdetach, 265 .f_event = tunkqwrite, 266 }; 267 268 static struct tuntap_driver { 269 struct cdevsw cdevsw; 270 int ident_flags; 271 struct unrhdr *unrhdr; 272 struct clonedevs *clones; 273 ifc_match_f *clone_match_fn; 274 ifc_create_f *clone_create_fn; 275 ifc_destroy_f *clone_destroy_fn; 276 } tuntap_drivers[] = { 277 { 278 .ident_flags = 0, 279 .cdevsw = { 280 .d_version = D_VERSION, 281 .d_flags = D_NEEDMINOR, 282 .d_open = tunopen, 283 .d_read = tunread, 284 .d_write = tunwrite, 285 .d_ioctl = tunioctl, 286 .d_poll = tunpoll, 287 .d_kqfilter = tunkqfilter, 288 .d_name = tunname, 289 }, 290 .clone_match_fn = tun_clone_match, 291 .clone_create_fn = tun_clone_create, 292 .clone_destroy_fn = tun_clone_destroy, 293 }, 294 { 295 .ident_flags = TUN_L2, 296 .cdevsw = { 297 .d_version = D_VERSION, 298 .d_flags = D_NEEDMINOR, 299 .d_open = tunopen, 300 .d_read = tunread, 301 .d_write = tunwrite, 302 .d_ioctl = tunioctl, 303 .d_poll = tunpoll, 304 .d_kqfilter = tunkqfilter, 305 .d_name = tapname, 306 }, 307 .clone_match_fn = tap_clone_match, 308 .clone_create_fn = tun_clone_create, 309 .clone_destroy_fn = tun_clone_destroy, 310 }, 311 { 312 .ident_flags = TUN_L2 | TUN_VMNET, 313 .cdevsw = { 314 .d_version = D_VERSION, 315 .d_flags = D_NEEDMINOR, 316 .d_open = tunopen, 317 .d_read = tunread, 318 .d_write = tunwrite, 319 .d_ioctl = tunioctl, 320 .d_poll = tunpoll, 321 .d_kqfilter = tunkqfilter, 322 .d_name = vmnetname, 323 }, 324 .clone_match_fn = vmnet_clone_match, 325 .clone_create_fn = tun_clone_create, 326 .clone_destroy_fn = tun_clone_destroy, 327 }, 328 }; 329 330 struct tuntap_driver_cloner { 331 SLIST_ENTRY(tuntap_driver_cloner) link; 332 struct tuntap_driver *drv; 333 struct if_clone *cloner; 334 }; 335 336 VNET_DEFINE_STATIC(SLIST_HEAD(, tuntap_driver_cloner), tuntap_driver_cloners) = 337 SLIST_HEAD_INITIALIZER(tuntap_driver_cloners); 338 339 #define V_tuntap_driver_cloners VNET(tuntap_driver_cloners) 340 341 /* 342 * Mechanism for marking a tunnel device as busy so that we can safely do some 343 * orthogonal operations (such as operations on devices) without racing against 344 * tun_destroy. tun_destroy will wait on the condvar if we're at all busy or 345 * open, to be woken up when the condition is alleviated. 346 */ 347 static int 348 tun_busy_locked(struct tuntap_softc *tp) 349 { 350 351 TUN_LOCK_ASSERT(tp); 352 if ((tp->tun_flags & TUN_DYING) != 0) { 353 /* 354 * Perhaps unintuitive, but the device is busy going away. 355 * Other interpretations of EBUSY from tun_busy make little 356 * sense, since making a busy device even more busy doesn't 357 * sound like a problem. 358 */ 359 return (EBUSY); 360 } 361 362 ++tp->tun_busy; 363 return (0); 364 } 365 366 static void 367 tun_unbusy_locked(struct tuntap_softc *tp) 368 { 369 370 TUN_LOCK_ASSERT(tp); 371 KASSERT(tp->tun_busy != 0, ("tun_unbusy: called for non-busy tunnel")); 372 373 --tp->tun_busy; 374 /* Wake up anything that may be waiting on our busy tunnel. */ 375 if (tp->tun_busy == 0) 376 cv_broadcast(&tp->tun_cv); 377 } 378 379 static int 380 tun_busy(struct tuntap_softc *tp) 381 { 382 int ret; 383 384 TUN_LOCK(tp); 385 ret = tun_busy_locked(tp); 386 TUN_UNLOCK(tp); 387 return (ret); 388 } 389 390 static void 391 tun_unbusy(struct tuntap_softc *tp) 392 { 393 394 TUN_LOCK(tp); 395 tun_unbusy_locked(tp); 396 TUN_UNLOCK(tp); 397 } 398 399 /* 400 * Sets unit and/or flags given the device name. Must be called with correct 401 * vnet context. 402 */ 403 static int 404 tuntap_name2info(const char *name, int *outunit, int *outflags) 405 { 406 struct tuntap_driver *drv; 407 struct tuntap_driver_cloner *drvc; 408 char *dname; 409 int flags, unit; 410 bool found; 411 412 if (name == NULL) 413 return (EINVAL); 414 415 /* 416 * Needed for dev_stdclone, but dev_stdclone will not modify, it just 417 * wants to be able to pass back a char * through the second param. We 418 * will always set that as NULL here, so we'll fake it. 419 */ 420 dname = __DECONST(char *, name); 421 found = false; 422 423 KASSERT(!SLIST_EMPTY(&V_tuntap_driver_cloners), 424 ("tuntap_driver_cloners failed to initialize")); 425 SLIST_FOREACH(drvc, &V_tuntap_driver_cloners, link) { 426 KASSERT(drvc->drv != NULL, 427 ("tuntap_driver_cloners entry not properly initialized")); 428 drv = drvc->drv; 429 430 if (strcmp(name, drv->cdevsw.d_name) == 0) { 431 found = true; 432 unit = -1; 433 flags = drv->ident_flags; 434 break; 435 } 436 437 if (dev_stdclone(dname, NULL, drv->cdevsw.d_name, &unit) == 1) { 438 found = true; 439 flags = drv->ident_flags; 440 break; 441 } 442 } 443 444 if (!found) 445 return (ENXIO); 446 447 if (outunit != NULL) 448 *outunit = unit; 449 if (outflags != NULL) 450 *outflags = flags; 451 return (0); 452 } 453 454 /* 455 * Get driver information from a set of flags specified. Masks the identifying 456 * part of the flags and compares it against all of the available 457 * tuntap_drivers. Must be called with correct vnet context. 458 */ 459 static struct tuntap_driver * 460 tuntap_driver_from_flags(int tun_flags) 461 { 462 struct tuntap_driver *drv; 463 struct tuntap_driver_cloner *drvc; 464 465 KASSERT(!SLIST_EMPTY(&V_tuntap_driver_cloners), 466 ("tuntap_driver_cloners failed to initialize")); 467 SLIST_FOREACH(drvc, &V_tuntap_driver_cloners, link) { 468 KASSERT(drvc->drv != NULL, 469 ("tuntap_driver_cloners entry not properly initialized")); 470 drv = drvc->drv; 471 if ((tun_flags & TUN_DRIVER_IDENT_MASK) == drv->ident_flags) 472 return (drv); 473 } 474 475 return (NULL); 476 } 477 478 static int 479 tun_clone_match(struct if_clone *ifc, const char *name) 480 { 481 int tunflags; 482 483 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 484 if ((tunflags & TUN_L2) == 0) 485 return (1); 486 } 487 488 return (0); 489 } 490 491 static int 492 tap_clone_match(struct if_clone *ifc, const char *name) 493 { 494 int tunflags; 495 496 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 497 if ((tunflags & (TUN_L2 | TUN_VMNET)) == TUN_L2) 498 return (1); 499 } 500 501 return (0); 502 } 503 504 static int 505 vmnet_clone_match(struct if_clone *ifc, const char *name) 506 { 507 int tunflags; 508 509 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 510 if ((tunflags & TUN_VMNET) != 0) 511 return (1); 512 } 513 514 return (0); 515 } 516 517 static int 518 tun_clone_create(struct if_clone *ifc, char *name, size_t len, 519 struct ifc_data *ifd, struct ifnet **ifpp) 520 { 521 struct tuntap_driver *drv; 522 struct cdev *dev; 523 int err, i, tunflags, unit; 524 525 tunflags = 0; 526 /* The name here tells us exactly what we're creating */ 527 err = tuntap_name2info(name, &unit, &tunflags); 528 if (err != 0) 529 return (err); 530 531 drv = tuntap_driver_from_flags(tunflags); 532 if (drv == NULL) 533 return (ENXIO); 534 535 if (unit != -1) { 536 /* If this unit number is still available that's okay. */ 537 if (alloc_unr_specific(drv->unrhdr, unit) == -1) 538 return (EEXIST); 539 } else { 540 unit = alloc_unr(drv->unrhdr); 541 } 542 543 snprintf(name, IFNAMSIZ, "%s%d", drv->cdevsw.d_name, unit); 544 545 /* find any existing device, or allocate new unit number */ 546 dev = NULL; 547 i = clone_create(&drv->clones, &drv->cdevsw, &unit, &dev, 0); 548 /* No preexisting struct cdev *, create one */ 549 if (i != 0) 550 i = tun_create_device(drv, unit, NULL, &dev, name); 551 if (i == 0) { 552 tuncreate(dev); 553 struct tuntap_softc *tp = dev->si_drv1; 554 *ifpp = tp->tun_ifp; 555 } 556 557 return (i); 558 } 559 560 static void 561 tunclone(void *arg, struct ucred *cred, char *name, int namelen, 562 struct cdev **dev) 563 { 564 char devname[SPECNAMELEN + 1]; 565 struct tuntap_driver *drv; 566 int append_unit, i, u, tunflags; 567 bool mayclone; 568 569 if (*dev != NULL) 570 return; 571 572 tunflags = 0; 573 CURVNET_SET(CRED_TO_VNET(cred)); 574 if (tuntap_name2info(name, &u, &tunflags) != 0) 575 goto out; /* Not recognized */ 576 577 if (u != -1 && u > IF_MAXUNIT) 578 goto out; /* Unit number too high */ 579 580 mayclone = priv_check_cred(cred, PRIV_NET_IFCREATE) == 0; 581 if ((tunflags & TUN_L2) != 0) { 582 /* tap/vmnet allow user open with a sysctl */ 583 mayclone = (mayclone || tap_allow_uopen) && tapdclone; 584 } else { 585 mayclone = mayclone && tundclone; 586 } 587 588 /* 589 * If tun cloning is enabled, only the superuser can create an 590 * interface. 591 */ 592 if (!mayclone) 593 goto out; 594 595 if (u == -1) 596 append_unit = 1; 597 else 598 append_unit = 0; 599 600 drv = tuntap_driver_from_flags(tunflags); 601 if (drv == NULL) 602 goto out; 603 604 /* find any existing device, or allocate new unit number */ 605 i = clone_create(&drv->clones, &drv->cdevsw, &u, dev, 0); 606 if (i) { 607 if (append_unit) { 608 namelen = snprintf(devname, sizeof(devname), "%s%d", 609 name, u); 610 name = devname; 611 } 612 613 i = tun_create_device(drv, u, cred, dev, name); 614 } 615 if (i == 0) 616 if_clone_create(name, namelen, NULL); 617 out: 618 CURVNET_RESTORE(); 619 } 620 621 static void 622 tun_destroy(struct tuntap_softc *tp) 623 { 624 625 TUN_LOCK(tp); 626 tp->tun_flags |= TUN_DYING; 627 if (tp->tun_busy != 0) 628 cv_wait_unlock(&tp->tun_cv, &tp->tun_mtx); 629 else 630 TUN_UNLOCK(tp); 631 632 CURVNET_SET(TUN2IFP(tp)->if_vnet); 633 634 /* destroy_dev will take care of any alias. */ 635 destroy_dev(tp->tun_dev); 636 seldrain(&tp->tun_rsel); 637 knlist_clear(&tp->tun_rsel.si_note, 0); 638 knlist_destroy(&tp->tun_rsel.si_note); 639 if ((tp->tun_flags & TUN_L2) != 0) { 640 ether_ifdetach(TUN2IFP(tp)); 641 } else { 642 bpfdetach(TUN2IFP(tp)); 643 if_detach(TUN2IFP(tp)); 644 } 645 sx_xlock(&tun_ioctl_sx); 646 TUN2IFP(tp)->if_softc = NULL; 647 sx_xunlock(&tun_ioctl_sx); 648 free_unr(tp->tun_drv->unrhdr, TUN2IFP(tp)->if_dunit); 649 if_free(TUN2IFP(tp)); 650 mtx_destroy(&tp->tun_mtx); 651 cv_destroy(&tp->tun_cv); 652 free(tp, M_TUN); 653 CURVNET_RESTORE(); 654 } 655 656 static int 657 tun_clone_destroy(struct if_clone *ifc __unused, struct ifnet *ifp, uint32_t flags) 658 { 659 struct tuntap_softc *tp = ifp->if_softc; 660 661 mtx_lock(&tunmtx); 662 TAILQ_REMOVE(&tunhead, tp, tun_list); 663 mtx_unlock(&tunmtx); 664 tun_destroy(tp); 665 666 return (0); 667 } 668 669 static void 670 vnet_tun_init(const void *unused __unused) 671 { 672 struct tuntap_driver *drv; 673 struct tuntap_driver_cloner *drvc; 674 int i; 675 676 for (i = 0; i < nitems(tuntap_drivers); ++i) { 677 drv = &tuntap_drivers[i]; 678 drvc = malloc(sizeof(*drvc), M_TUN, M_WAITOK | M_ZERO); 679 680 drvc->drv = drv; 681 struct if_clone_addreq req = { 682 .match_f = drv->clone_match_fn, 683 .create_f = drv->clone_create_fn, 684 .destroy_f = drv->clone_destroy_fn, 685 }; 686 drvc->cloner = ifc_attach_cloner(drv->cdevsw.d_name, &req); 687 SLIST_INSERT_HEAD(&V_tuntap_driver_cloners, drvc, link); 688 }; 689 } 690 VNET_SYSINIT(vnet_tun_init, SI_SUB_PROTO_IF, SI_ORDER_ANY, 691 vnet_tun_init, NULL); 692 693 static void 694 vnet_tun_uninit(const void *unused __unused) 695 { 696 struct tuntap_driver_cloner *drvc; 697 698 while (!SLIST_EMPTY(&V_tuntap_driver_cloners)) { 699 drvc = SLIST_FIRST(&V_tuntap_driver_cloners); 700 SLIST_REMOVE_HEAD(&V_tuntap_driver_cloners, link); 701 702 if_clone_detach(drvc->cloner); 703 free(drvc, M_TUN); 704 } 705 } 706 VNET_SYSUNINIT(vnet_tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY, 707 vnet_tun_uninit, NULL); 708 709 static void 710 tun_uninit(const void *unused __unused) 711 { 712 struct tuntap_driver *drv; 713 struct tuntap_softc *tp; 714 int i; 715 716 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, arrival_tag); 717 EVENTHANDLER_DEREGISTER(dev_clone, clone_tag); 718 719 mtx_lock(&tunmtx); 720 while ((tp = TAILQ_FIRST(&tunhead)) != NULL) { 721 TAILQ_REMOVE(&tunhead, tp, tun_list); 722 mtx_unlock(&tunmtx); 723 tun_destroy(tp); 724 mtx_lock(&tunmtx); 725 } 726 mtx_unlock(&tunmtx); 727 for (i = 0; i < nitems(tuntap_drivers); ++i) { 728 drv = &tuntap_drivers[i]; 729 delete_unrhdr(drv->unrhdr); 730 clone_cleanup(&drv->clones); 731 } 732 mtx_destroy(&tunmtx); 733 } 734 SYSUNINIT(tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY, tun_uninit, NULL); 735 736 static struct tuntap_driver * 737 tuntap_driver_from_ifnet(const struct ifnet *ifp) 738 { 739 struct tuntap_driver *drv; 740 int i; 741 742 if (ifp == NULL) 743 return (NULL); 744 745 for (i = 0; i < nitems(tuntap_drivers); ++i) { 746 drv = &tuntap_drivers[i]; 747 if (strcmp(ifp->if_dname, drv->cdevsw.d_name) == 0) 748 return (drv); 749 } 750 751 return (NULL); 752 } 753 754 static int 755 tuntapmodevent(module_t mod, int type, void *data) 756 { 757 struct tuntap_driver *drv; 758 int i; 759 760 switch (type) { 761 case MOD_LOAD: 762 mtx_init(&tunmtx, "tunmtx", NULL, MTX_DEF); 763 for (i = 0; i < nitems(tuntap_drivers); ++i) { 764 drv = &tuntap_drivers[i]; 765 clone_setup(&drv->clones); 766 drv->unrhdr = new_unrhdr(0, IF_MAXUNIT, &tunmtx); 767 } 768 arrival_tag = EVENTHANDLER_REGISTER(ifnet_arrival_event, 769 tunrename, 0, 1000); 770 if (arrival_tag == NULL) 771 return (ENOMEM); 772 clone_tag = EVENTHANDLER_REGISTER(dev_clone, tunclone, 0, 1000); 773 if (clone_tag == NULL) 774 return (ENOMEM); 775 break; 776 case MOD_UNLOAD: 777 /* See tun_uninit, so it's done after the vnet_sysuninit() */ 778 break; 779 default: 780 return EOPNOTSUPP; 781 } 782 return 0; 783 } 784 785 static moduledata_t tuntap_mod = { 786 "if_tuntap", 787 tuntapmodevent, 788 0 789 }; 790 791 /* We'll only ever have these two, so no need for a macro. */ 792 static moduledata_t tun_mod = { "if_tun", NULL, 0 }; 793 static moduledata_t tap_mod = { "if_tap", NULL, 0 }; 794 795 DECLARE_MODULE(if_tuntap, tuntap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 796 MODULE_VERSION(if_tuntap, 1); 797 DECLARE_MODULE(if_tun, tun_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 798 MODULE_VERSION(if_tun, 1); 799 DECLARE_MODULE(if_tap, tap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 800 MODULE_VERSION(if_tap, 1); 801 802 static int 803 tun_create_device(struct tuntap_driver *drv, int unit, struct ucred *cr, 804 struct cdev **dev, const char *name) 805 { 806 struct make_dev_args args; 807 struct tuntap_softc *tp; 808 int error; 809 810 tp = malloc(sizeof(*tp), M_TUN, M_WAITOK | M_ZERO); 811 mtx_init(&tp->tun_mtx, "tun_mtx", NULL, MTX_DEF); 812 cv_init(&tp->tun_cv, "tun_condvar"); 813 tp->tun_flags = drv->ident_flags; 814 tp->tun_drv = drv; 815 816 make_dev_args_init(&args); 817 if (cr != NULL) 818 args.mda_flags = MAKEDEV_REF; 819 args.mda_devsw = &drv->cdevsw; 820 args.mda_cr = cr; 821 args.mda_uid = UID_UUCP; 822 args.mda_gid = GID_DIALER; 823 args.mda_mode = 0600; 824 args.mda_unit = unit; 825 args.mda_si_drv1 = tp; 826 error = make_dev_s(&args, dev, "%s", name); 827 if (error != 0) { 828 free(tp, M_TUN); 829 return (error); 830 } 831 832 KASSERT((*dev)->si_drv1 != NULL, 833 ("Failed to set si_drv1 at %s creation", name)); 834 tp->tun_dev = *dev; 835 knlist_init_mtx(&tp->tun_rsel.si_note, &tp->tun_mtx); 836 mtx_lock(&tunmtx); 837 TAILQ_INSERT_TAIL(&tunhead, tp, tun_list); 838 mtx_unlock(&tunmtx); 839 return (0); 840 } 841 842 static void 843 tunstart(struct ifnet *ifp) 844 { 845 struct tuntap_softc *tp = ifp->if_softc; 846 struct mbuf *m; 847 848 TUNDEBUG(ifp, "starting\n"); 849 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 850 IFQ_LOCK(&ifp->if_snd); 851 IFQ_POLL_NOLOCK(&ifp->if_snd, m); 852 if (m == NULL) { 853 IFQ_UNLOCK(&ifp->if_snd); 854 return; 855 } 856 IFQ_UNLOCK(&ifp->if_snd); 857 } 858 859 TUN_LOCK(tp); 860 if (tp->tun_flags & TUN_RWAIT) { 861 tp->tun_flags &= ~TUN_RWAIT; 862 wakeup(tp); 863 } 864 selwakeuppri(&tp->tun_rsel, PZERO + 1); 865 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 866 if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio) { 867 TUN_UNLOCK(tp); 868 pgsigio(&tp->tun_sigio, SIGIO, 0); 869 } else 870 TUN_UNLOCK(tp); 871 } 872 873 /* 874 * tunstart_l2 875 * 876 * queue packets from higher level ready to put out 877 */ 878 static void 879 tunstart_l2(struct ifnet *ifp) 880 { 881 struct tuntap_softc *tp = ifp->if_softc; 882 883 TUNDEBUG(ifp, "starting\n"); 884 885 /* 886 * do not junk pending output if we are in VMnet mode. 887 * XXX: can this do any harm because of queue overflow? 888 */ 889 890 TUN_LOCK(tp); 891 if (((tp->tun_flags & TUN_VMNET) == 0) && 892 ((tp->tun_flags & TUN_READY) != TUN_READY)) { 893 struct mbuf *m; 894 895 /* Unlocked read. */ 896 TUNDEBUG(ifp, "not ready, tun_flags = 0x%x\n", tp->tun_flags); 897 898 for (;;) { 899 IF_DEQUEUE(&ifp->if_snd, m); 900 if (m != NULL) { 901 m_freem(m); 902 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 903 } else 904 break; 905 } 906 TUN_UNLOCK(tp); 907 908 return; 909 } 910 911 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 912 913 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 914 if (tp->tun_flags & TUN_RWAIT) { 915 tp->tun_flags &= ~TUN_RWAIT; 916 wakeup(tp); 917 } 918 919 if ((tp->tun_flags & TUN_ASYNC) && (tp->tun_sigio != NULL)) { 920 TUN_UNLOCK(tp); 921 pgsigio(&tp->tun_sigio, SIGIO, 0); 922 TUN_LOCK(tp); 923 } 924 925 selwakeuppri(&tp->tun_rsel, PZERO+1); 926 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 927 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); /* obytes are counted in ether_output */ 928 } 929 930 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 931 TUN_UNLOCK(tp); 932 } /* tunstart_l2 */ 933 934 /* XXX: should return an error code so it can fail. */ 935 static void 936 tuncreate(struct cdev *dev) 937 { 938 struct tuntap_driver *drv; 939 struct tuntap_softc *tp; 940 struct ifnet *ifp; 941 struct ether_addr eaddr; 942 int iflags; 943 u_char type; 944 945 tp = dev->si_drv1; 946 KASSERT(tp != NULL, 947 ("si_drv1 should have been initialized at creation")); 948 949 drv = tp->tun_drv; 950 iflags = IFF_MULTICAST; 951 if ((tp->tun_flags & TUN_L2) != 0) { 952 type = IFT_ETHER; 953 iflags |= IFF_BROADCAST | IFF_SIMPLEX; 954 } else { 955 type = IFT_PPP; 956 iflags |= IFF_POINTOPOINT; 957 } 958 ifp = tp->tun_ifp = if_alloc(type); 959 if (ifp == NULL) 960 panic("%s%d: failed to if_alloc() interface.\n", 961 drv->cdevsw.d_name, dev2unit(dev)); 962 ifp->if_softc = tp; 963 if_initname(ifp, drv->cdevsw.d_name, dev2unit(dev)); 964 ifp->if_ioctl = tunifioctl; 965 ifp->if_flags = iflags; 966 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 967 ifp->if_capabilities |= IFCAP_LINKSTATE; 968 ifp->if_capenable |= IFCAP_LINKSTATE; 969 970 if ((tp->tun_flags & TUN_L2) != 0) { 971 ifp->if_init = tunifinit; 972 ifp->if_start = tunstart_l2; 973 974 ether_gen_addr(ifp, &eaddr); 975 ether_ifattach(ifp, eaddr.octet); 976 } else { 977 ifp->if_mtu = TUNMTU; 978 ifp->if_start = tunstart; 979 ifp->if_output = tunoutput; 980 981 ifp->if_snd.ifq_drv_maxlen = 0; 982 IFQ_SET_READY(&ifp->if_snd); 983 984 if_attach(ifp); 985 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 986 } 987 988 TUN_LOCK(tp); 989 tp->tun_flags |= TUN_INITED; 990 TUN_UNLOCK(tp); 991 992 TUNDEBUG(ifp, "interface %s is created, minor = %#x\n", 993 ifp->if_xname, dev2unit(dev)); 994 } 995 996 static void 997 tunrename(void *arg __unused, struct ifnet *ifp) 998 { 999 struct tuntap_softc *tp; 1000 int error; 1001 1002 if ((ifp->if_flags & IFF_RENAMING) == 0) 1003 return; 1004 1005 if (tuntap_driver_from_ifnet(ifp) == NULL) 1006 return; 1007 1008 /* 1009 * We need to grab the ioctl sx long enough to make sure the softc is 1010 * still there. If it is, we can safely try to busy the tun device. 1011 * The busy may fail if the device is currently dying, in which case 1012 * we do nothing. If it doesn't fail, the busy count stops the device 1013 * from dying until we've created the alias (that will then be 1014 * subsequently destroyed). 1015 */ 1016 sx_xlock(&tun_ioctl_sx); 1017 tp = ifp->if_softc; 1018 if (tp == NULL) { 1019 sx_xunlock(&tun_ioctl_sx); 1020 return; 1021 } 1022 error = tun_busy(tp); 1023 sx_xunlock(&tun_ioctl_sx); 1024 if (error != 0) 1025 return; 1026 if (tp->tun_alias != NULL) { 1027 destroy_dev(tp->tun_alias); 1028 tp->tun_alias = NULL; 1029 } 1030 1031 if (strcmp(ifp->if_xname, tp->tun_dev->si_name) == 0) 1032 goto out; 1033 1034 /* 1035 * Failure's ok, aliases are created on a best effort basis. If a 1036 * tun user/consumer decides to rename the interface to conflict with 1037 * another device (non-ifnet) on the system, we will assume they know 1038 * what they are doing. make_dev_alias_p won't touch tun_alias on 1039 * failure, so we use it but ignore the return value. 1040 */ 1041 make_dev_alias_p(MAKEDEV_CHECKNAME, &tp->tun_alias, tp->tun_dev, "%s", 1042 ifp->if_xname); 1043 out: 1044 tun_unbusy(tp); 1045 } 1046 1047 static int 1048 tunopen(struct cdev *dev, int flag, int mode, struct thread *td) 1049 { 1050 struct ifnet *ifp; 1051 struct tuntap_softc *tp; 1052 int error __diagused, tunflags; 1053 1054 tunflags = 0; 1055 CURVNET_SET(TD_TO_VNET(td)); 1056 error = tuntap_name2info(dev->si_name, NULL, &tunflags); 1057 if (error != 0) { 1058 CURVNET_RESTORE(); 1059 return (error); /* Shouldn't happen */ 1060 } 1061 1062 tp = dev->si_drv1; 1063 KASSERT(tp != NULL, 1064 ("si_drv1 should have been initialized at creation")); 1065 1066 TUN_LOCK(tp); 1067 if ((tp->tun_flags & TUN_INITED) == 0) { 1068 TUN_UNLOCK(tp); 1069 CURVNET_RESTORE(); 1070 return (ENXIO); 1071 } 1072 if ((tp->tun_flags & (TUN_OPEN | TUN_DYING)) != 0) { 1073 TUN_UNLOCK(tp); 1074 CURVNET_RESTORE(); 1075 return (EBUSY); 1076 } 1077 1078 error = tun_busy_locked(tp); 1079 KASSERT(error == 0, ("Must be able to busy an unopen tunnel")); 1080 ifp = TUN2IFP(tp); 1081 1082 if ((tp->tun_flags & TUN_L2) != 0) { 1083 bcopy(IF_LLADDR(ifp), tp->tun_ether.octet, 1084 sizeof(tp->tun_ether.octet)); 1085 1086 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1087 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1088 1089 if (tapuponopen) 1090 ifp->if_flags |= IFF_UP; 1091 } 1092 1093 tp->tun_pid = td->td_proc->p_pid; 1094 tp->tun_flags |= TUN_OPEN; 1095 1096 if_link_state_change(ifp, LINK_STATE_UP); 1097 TUNDEBUG(ifp, "open\n"); 1098 TUN_UNLOCK(tp); 1099 1100 /* 1101 * This can fail with either ENOENT or EBUSY. This is in the middle of 1102 * d_open, so ENOENT should not be possible. EBUSY is possible, but 1103 * the only cdevpriv dtor being set will be tundtor and the softc being 1104 * passed is constant for a given cdev. We ignore the possible error 1105 * because of this as either "unlikely" or "not actually a problem." 1106 */ 1107 (void)devfs_set_cdevpriv(tp, tundtor); 1108 CURVNET_RESTORE(); 1109 return (0); 1110 } 1111 1112 /* 1113 * tundtor - tear down the device - mark i/f down & delete 1114 * routing info 1115 */ 1116 static void 1117 tundtor(void *data) 1118 { 1119 struct proc *p; 1120 struct tuntap_softc *tp; 1121 struct ifnet *ifp; 1122 bool l2tun; 1123 1124 tp = data; 1125 p = curproc; 1126 ifp = TUN2IFP(tp); 1127 1128 TUN_LOCK(tp); 1129 1130 /* 1131 * Realistically, we can't be obstinate here. This only means that the 1132 * tuntap device was closed out of order, and the last closer wasn't the 1133 * controller. These are still good to know about, though, as software 1134 * should avoid multiple processes with a tuntap device open and 1135 * ill-defined transfer of control (e.g., handoff, TUNSIFPID, close in 1136 * parent). 1137 */ 1138 if (p->p_pid != tp->tun_pid) { 1139 log(LOG_INFO, 1140 "pid %d (%s), %s: tun/tap protocol violation, non-controlling process closed last.\n", 1141 p->p_pid, p->p_comm, tp->tun_dev->si_name); 1142 } 1143 1144 /* 1145 * junk all pending output 1146 */ 1147 CURVNET_SET(ifp->if_vnet); 1148 1149 l2tun = false; 1150 if ((tp->tun_flags & TUN_L2) != 0) { 1151 l2tun = true; 1152 IF_DRAIN(&ifp->if_snd); 1153 } else { 1154 IFQ_PURGE(&ifp->if_snd); 1155 } 1156 1157 /* For vmnet, we won't do most of the address/route bits */ 1158 if ((tp->tun_flags & TUN_VMNET) != 0 || 1159 (l2tun && (ifp->if_flags & IFF_LINK0) != 0)) 1160 goto out; 1161 1162 if (ifp->if_flags & IFF_UP) { 1163 TUN_UNLOCK(tp); 1164 if_down(ifp); 1165 TUN_LOCK(tp); 1166 } 1167 1168 /* Delete all addresses and routes which reference this interface. */ 1169 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1170 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1171 TUN_UNLOCK(tp); 1172 if_purgeaddrs(ifp); 1173 TUN_LOCK(tp); 1174 } 1175 1176 out: 1177 if_link_state_change(ifp, LINK_STATE_DOWN); 1178 CURVNET_RESTORE(); 1179 1180 funsetown(&tp->tun_sigio); 1181 selwakeuppri(&tp->tun_rsel, PZERO + 1); 1182 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 1183 TUNDEBUG (ifp, "closed\n"); 1184 tp->tun_flags &= ~TUN_OPEN; 1185 tp->tun_pid = 0; 1186 tun_vnethdr_set(ifp, 0); 1187 1188 tun_unbusy_locked(tp); 1189 TUN_UNLOCK(tp); 1190 } 1191 1192 static void 1193 tuninit(struct ifnet *ifp) 1194 { 1195 struct tuntap_softc *tp = ifp->if_softc; 1196 1197 TUNDEBUG(ifp, "tuninit\n"); 1198 1199 TUN_LOCK(tp); 1200 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1201 if ((tp->tun_flags & TUN_L2) == 0) { 1202 ifp->if_flags |= IFF_UP; 1203 getmicrotime(&ifp->if_lastchange); 1204 TUN_UNLOCK(tp); 1205 } else { 1206 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1207 TUN_UNLOCK(tp); 1208 /* attempt to start output */ 1209 tunstart_l2(ifp); 1210 } 1211 1212 } 1213 1214 /* 1215 * Used only for l2 tunnel. 1216 */ 1217 static void 1218 tunifinit(void *xtp) 1219 { 1220 struct tuntap_softc *tp; 1221 1222 tp = (struct tuntap_softc *)xtp; 1223 tuninit(tp->tun_ifp); 1224 } 1225 1226 /* 1227 * To be called under TUN_LOCK. Update ifp->if_hwassist according to the 1228 * current value of ifp->if_capenable. 1229 */ 1230 static void 1231 tun_caps_changed(struct ifnet *ifp) 1232 { 1233 uint64_t hwassist = 0; 1234 1235 TUN_LOCK_ASSERT((struct tuntap_softc *)ifp->if_softc); 1236 if (ifp->if_capenable & IFCAP_TXCSUM) 1237 hwassist |= CSUM_TCP | CSUM_UDP; 1238 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) 1239 hwassist |= CSUM_TCP_IPV6 1240 | CSUM_UDP_IPV6; 1241 if (ifp->if_capenable & IFCAP_TSO4) 1242 hwassist |= CSUM_IP_TSO; 1243 if (ifp->if_capenable & IFCAP_TSO6) 1244 hwassist |= CSUM_IP6_TSO; 1245 ifp->if_hwassist = hwassist; 1246 } 1247 1248 /* 1249 * To be called under TUN_LOCK. Update tp->tun_vhdrlen and adjust 1250 * if_capabilities and if_capenable as needed. 1251 */ 1252 static void 1253 tun_vnethdr_set(struct ifnet *ifp, int vhdrlen) 1254 { 1255 struct tuntap_softc *tp = ifp->if_softc; 1256 1257 TUN_LOCK_ASSERT(tp); 1258 1259 if (tp->tun_vhdrlen == vhdrlen) 1260 return; 1261 1262 /* 1263 * Update if_capabilities to reflect the 1264 * functionalities offered by the virtio-net 1265 * header. 1266 */ 1267 if (vhdrlen != 0) 1268 ifp->if_capabilities |= 1269 TAP_VNET_HDR_CAPS; 1270 else 1271 ifp->if_capabilities &= 1272 ~TAP_VNET_HDR_CAPS; 1273 /* 1274 * Disable any capabilities that we don't 1275 * support anymore. 1276 */ 1277 ifp->if_capenable &= ifp->if_capabilities; 1278 tun_caps_changed(ifp); 1279 tp->tun_vhdrlen = vhdrlen; 1280 1281 TUNDEBUG(ifp, "vnet_hdr_len=%d, if_capabilities=%x\n", 1282 vhdrlen, ifp->if_capabilities); 1283 } 1284 1285 /* 1286 * Process an ioctl request. 1287 */ 1288 static int 1289 tunifioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1290 { 1291 struct ifreq *ifr = (struct ifreq *)data; 1292 struct tuntap_softc *tp; 1293 struct ifstat *ifs; 1294 struct ifmediareq *ifmr; 1295 int dummy, error = 0; 1296 bool l2tun; 1297 1298 ifmr = NULL; 1299 sx_xlock(&tun_ioctl_sx); 1300 tp = ifp->if_softc; 1301 if (tp == NULL) { 1302 error = ENXIO; 1303 goto bad; 1304 } 1305 l2tun = (tp->tun_flags & TUN_L2) != 0; 1306 switch(cmd) { 1307 case SIOCGIFSTATUS: 1308 ifs = (struct ifstat *)data; 1309 TUN_LOCK(tp); 1310 if (tp->tun_pid) 1311 snprintf(ifs->ascii, sizeof(ifs->ascii), 1312 "\tOpened by PID %d\n", tp->tun_pid); 1313 else 1314 ifs->ascii[0] = '\0'; 1315 TUN_UNLOCK(tp); 1316 break; 1317 case SIOCSIFADDR: 1318 if (l2tun) 1319 error = ether_ioctl(ifp, cmd, data); 1320 else 1321 tuninit(ifp); 1322 if (error == 0) 1323 TUNDEBUG(ifp, "address set\n"); 1324 break; 1325 case SIOCSIFMTU: 1326 ifp->if_mtu = ifr->ifr_mtu; 1327 TUNDEBUG(ifp, "mtu set\n"); 1328 break; 1329 case SIOCSIFFLAGS: 1330 case SIOCADDMULTI: 1331 case SIOCDELMULTI: 1332 break; 1333 case SIOCGIFMEDIA: 1334 if (!l2tun) { 1335 error = EINVAL; 1336 break; 1337 } 1338 1339 ifmr = (struct ifmediareq *)data; 1340 dummy = ifmr->ifm_count; 1341 ifmr->ifm_count = 1; 1342 ifmr->ifm_status = IFM_AVALID; 1343 ifmr->ifm_active = IFM_ETHER; 1344 if (tp->tun_flags & TUN_OPEN) 1345 ifmr->ifm_status |= IFM_ACTIVE; 1346 ifmr->ifm_current = ifmr->ifm_active; 1347 if (dummy >= 1) { 1348 int media = IFM_ETHER; 1349 error = copyout(&media, ifmr->ifm_ulist, sizeof(int)); 1350 } 1351 break; 1352 case SIOCSIFCAP: 1353 TUN_LOCK(tp); 1354 ifp->if_capenable = ifr->ifr_reqcap; 1355 tun_caps_changed(ifp); 1356 TUN_UNLOCK(tp); 1357 VLAN_CAPABILITIES(ifp); 1358 break; 1359 default: 1360 if (l2tun) { 1361 error = ether_ioctl(ifp, cmd, data); 1362 } else { 1363 error = EINVAL; 1364 } 1365 } 1366 bad: 1367 sx_xunlock(&tun_ioctl_sx); 1368 return (error); 1369 } 1370 1371 /* 1372 * tunoutput - queue packets from higher level ready to put out. 1373 */ 1374 static int 1375 tunoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 1376 struct route *ro) 1377 { 1378 struct tuntap_softc *tp = ifp->if_softc; 1379 u_short cached_tun_flags; 1380 int error; 1381 u_int32_t af; 1382 1383 TUNDEBUG (ifp, "tunoutput\n"); 1384 1385 #ifdef MAC 1386 error = mac_ifnet_check_transmit(ifp, m0); 1387 if (error) { 1388 m_freem(m0); 1389 return (error); 1390 } 1391 #endif 1392 1393 /* Could be unlocked read? */ 1394 TUN_LOCK(tp); 1395 cached_tun_flags = tp->tun_flags; 1396 TUN_UNLOCK(tp); 1397 if ((cached_tun_flags & TUN_READY) != TUN_READY) { 1398 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 1399 m_freem (m0); 1400 return (EHOSTDOWN); 1401 } 1402 1403 if ((ifp->if_flags & IFF_UP) != IFF_UP) { 1404 m_freem (m0); 1405 return (EHOSTDOWN); 1406 } 1407 1408 /* BPF writes need to be handled specially. */ 1409 if (dst->sa_family == AF_UNSPEC) 1410 bcopy(dst->sa_data, &af, sizeof(af)); 1411 else 1412 af = RO_GET_FAMILY(ro, dst); 1413 1414 if (bpf_peers_present(ifp->if_bpf)) 1415 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m0); 1416 1417 /* prepend sockaddr? this may abort if the mbuf allocation fails */ 1418 if (cached_tun_flags & TUN_LMODE) { 1419 /* allocate space for sockaddr */ 1420 M_PREPEND(m0, dst->sa_len, M_NOWAIT); 1421 1422 /* if allocation failed drop packet */ 1423 if (m0 == NULL) { 1424 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1); 1425 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 1426 return (ENOBUFS); 1427 } else { 1428 bcopy(dst, m0->m_data, dst->sa_len); 1429 } 1430 } 1431 1432 if (cached_tun_flags & TUN_IFHEAD) { 1433 /* Prepend the address family */ 1434 M_PREPEND(m0, 4, M_NOWAIT); 1435 1436 /* if allocation failed drop packet */ 1437 if (m0 == NULL) { 1438 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1); 1439 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 1440 return (ENOBUFS); 1441 } else 1442 *(u_int32_t *)m0->m_data = htonl(af); 1443 } else { 1444 #ifdef INET 1445 if (af != AF_INET) 1446 #endif 1447 { 1448 m_freem(m0); 1449 return (EAFNOSUPPORT); 1450 } 1451 } 1452 1453 error = (ifp->if_transmit)(ifp, m0); 1454 if (error) 1455 return (ENOBUFS); 1456 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 1457 return (0); 1458 } 1459 1460 /* 1461 * the cdevsw interface is now pretty minimal. 1462 */ 1463 static int 1464 tunioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, 1465 struct thread *td) 1466 { 1467 struct ifreq ifr, *ifrp; 1468 struct tuntap_softc *tp = dev->si_drv1; 1469 struct ifnet *ifp = TUN2IFP(tp); 1470 struct tuninfo *tunp; 1471 int error, iflags, ival; 1472 bool l2tun; 1473 1474 l2tun = (tp->tun_flags & TUN_L2) != 0; 1475 if (l2tun) { 1476 /* tap specific ioctls */ 1477 switch(cmd) { 1478 /* VMware/VMnet port ioctl's */ 1479 #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 1480 defined(COMPAT_FREEBSD4) 1481 case _IO('V', 0): 1482 ival = IOCPARM_IVAL(data); 1483 data = (caddr_t)&ival; 1484 /* FALLTHROUGH */ 1485 #endif 1486 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 1487 iflags = *(int *)data; 1488 iflags &= TUN_VMIO_FLAG_MASK; 1489 iflags &= ~IFF_CANTCHANGE; 1490 iflags |= IFF_UP; 1491 1492 TUN_LOCK(tp); 1493 ifp->if_flags = iflags | 1494 (ifp->if_flags & IFF_CANTCHANGE); 1495 TUN_UNLOCK(tp); 1496 1497 return (0); 1498 case SIOCGIFADDR: /* get MAC address of the remote side */ 1499 TUN_LOCK(tp); 1500 bcopy(&tp->tun_ether.octet, data, 1501 sizeof(tp->tun_ether.octet)); 1502 TUN_UNLOCK(tp); 1503 1504 return (0); 1505 case SIOCSIFADDR: /* set MAC address of the remote side */ 1506 TUN_LOCK(tp); 1507 bcopy(data, &tp->tun_ether.octet, 1508 sizeof(tp->tun_ether.octet)); 1509 TUN_UNLOCK(tp); 1510 1511 return (0); 1512 case TAPSVNETHDR: 1513 ival = *(int *)data; 1514 if (ival != 0 && 1515 ival != sizeof(struct virtio_net_hdr) && 1516 ival != sizeof(struct virtio_net_hdr_mrg_rxbuf)) { 1517 return (EINVAL); 1518 } 1519 TUN_LOCK(tp); 1520 tun_vnethdr_set(ifp, ival); 1521 TUN_UNLOCK(tp); 1522 1523 return (0); 1524 case TAPGVNETHDR: 1525 TUN_LOCK(tp); 1526 *(int *)data = tp->tun_vhdrlen; 1527 TUN_UNLOCK(tp); 1528 1529 return (0); 1530 } 1531 1532 /* Fall through to the common ioctls if unhandled */ 1533 } else { 1534 switch (cmd) { 1535 case TUNSLMODE: 1536 TUN_LOCK(tp); 1537 if (*(int *)data) { 1538 tp->tun_flags |= TUN_LMODE; 1539 tp->tun_flags &= ~TUN_IFHEAD; 1540 } else 1541 tp->tun_flags &= ~TUN_LMODE; 1542 TUN_UNLOCK(tp); 1543 1544 return (0); 1545 case TUNSIFHEAD: 1546 TUN_LOCK(tp); 1547 if (*(int *)data) { 1548 tp->tun_flags |= TUN_IFHEAD; 1549 tp->tun_flags &= ~TUN_LMODE; 1550 } else 1551 tp->tun_flags &= ~TUN_IFHEAD; 1552 TUN_UNLOCK(tp); 1553 1554 return (0); 1555 case TUNGIFHEAD: 1556 TUN_LOCK(tp); 1557 *(int *)data = (tp->tun_flags & TUN_IFHEAD) ? 1 : 0; 1558 TUN_UNLOCK(tp); 1559 1560 return (0); 1561 case TUNSIFMODE: 1562 /* deny this if UP */ 1563 if (TUN2IFP(tp)->if_flags & IFF_UP) 1564 return (EBUSY); 1565 1566 switch (*(int *)data & ~IFF_MULTICAST) { 1567 case IFF_POINTOPOINT: 1568 case IFF_BROADCAST: 1569 TUN_LOCK(tp); 1570 TUN2IFP(tp)->if_flags &= 1571 ~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST); 1572 TUN2IFP(tp)->if_flags |= *(int *)data; 1573 TUN_UNLOCK(tp); 1574 1575 break; 1576 default: 1577 return (EINVAL); 1578 } 1579 1580 return (0); 1581 case TUNSIFPID: 1582 TUN_LOCK(tp); 1583 tp->tun_pid = curthread->td_proc->p_pid; 1584 TUN_UNLOCK(tp); 1585 1586 return (0); 1587 } 1588 /* Fall through to the common ioctls if unhandled */ 1589 } 1590 1591 switch (cmd) { 1592 case TUNGIFNAME: 1593 ifrp = (struct ifreq *)data; 1594 strlcpy(ifrp->ifr_name, TUN2IFP(tp)->if_xname, IFNAMSIZ); 1595 1596 return (0); 1597 case TUNSIFINFO: 1598 tunp = (struct tuninfo *)data; 1599 if (TUN2IFP(tp)->if_type != tunp->type) 1600 return (EPROTOTYPE); 1601 TUN_LOCK(tp); 1602 if (TUN2IFP(tp)->if_mtu != tunp->mtu) { 1603 strlcpy(ifr.ifr_name, if_name(TUN2IFP(tp)), IFNAMSIZ); 1604 ifr.ifr_mtu = tunp->mtu; 1605 CURVNET_SET(TUN2IFP(tp)->if_vnet); 1606 error = ifhwioctl(SIOCSIFMTU, TUN2IFP(tp), 1607 (caddr_t)&ifr, td); 1608 CURVNET_RESTORE(); 1609 if (error) { 1610 TUN_UNLOCK(tp); 1611 return (error); 1612 } 1613 } 1614 TUN2IFP(tp)->if_baudrate = tunp->baudrate; 1615 TUN_UNLOCK(tp); 1616 break; 1617 case TUNGIFINFO: 1618 tunp = (struct tuninfo *)data; 1619 TUN_LOCK(tp); 1620 tunp->mtu = TUN2IFP(tp)->if_mtu; 1621 tunp->type = TUN2IFP(tp)->if_type; 1622 tunp->baudrate = TUN2IFP(tp)->if_baudrate; 1623 TUN_UNLOCK(tp); 1624 break; 1625 case TUNSDEBUG: 1626 tundebug = *(int *)data; 1627 break; 1628 case TUNGDEBUG: 1629 *(int *)data = tundebug; 1630 break; 1631 case FIONBIO: 1632 break; 1633 case FIOASYNC: 1634 TUN_LOCK(tp); 1635 if (*(int *)data) 1636 tp->tun_flags |= TUN_ASYNC; 1637 else 1638 tp->tun_flags &= ~TUN_ASYNC; 1639 TUN_UNLOCK(tp); 1640 break; 1641 case FIONREAD: 1642 if (!IFQ_IS_EMPTY(&TUN2IFP(tp)->if_snd)) { 1643 struct mbuf *mb; 1644 IFQ_LOCK(&TUN2IFP(tp)->if_snd); 1645 IFQ_POLL_NOLOCK(&TUN2IFP(tp)->if_snd, mb); 1646 for (*(int *)data = 0; mb != NULL; mb = mb->m_next) 1647 *(int *)data += mb->m_len; 1648 IFQ_UNLOCK(&TUN2IFP(tp)->if_snd); 1649 } else 1650 *(int *)data = 0; 1651 break; 1652 case FIOSETOWN: 1653 return (fsetown(*(int *)data, &tp->tun_sigio)); 1654 1655 case FIOGETOWN: 1656 *(int *)data = fgetown(&tp->tun_sigio); 1657 return (0); 1658 1659 /* This is deprecated, FIOSETOWN should be used instead. */ 1660 case TIOCSPGRP: 1661 return (fsetown(-(*(int *)data), &tp->tun_sigio)); 1662 1663 /* This is deprecated, FIOGETOWN should be used instead. */ 1664 case TIOCGPGRP: 1665 *(int *)data = -fgetown(&tp->tun_sigio); 1666 return (0); 1667 1668 default: 1669 return (ENOTTY); 1670 } 1671 return (0); 1672 } 1673 1674 /* 1675 * The cdevsw read interface - reads a packet at a time, or at 1676 * least as much of a packet as can be read. 1677 */ 1678 static int 1679 tunread(struct cdev *dev, struct uio *uio, int flag) 1680 { 1681 struct tuntap_softc *tp = dev->si_drv1; 1682 struct ifnet *ifp = TUN2IFP(tp); 1683 struct mbuf *m; 1684 size_t len; 1685 int error = 0; 1686 1687 TUNDEBUG (ifp, "read\n"); 1688 TUN_LOCK(tp); 1689 if ((tp->tun_flags & TUN_READY) != TUN_READY) { 1690 TUN_UNLOCK(tp); 1691 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 1692 return (EHOSTDOWN); 1693 } 1694 1695 tp->tun_flags &= ~TUN_RWAIT; 1696 1697 for (;;) { 1698 IFQ_DEQUEUE(&ifp->if_snd, m); 1699 if (m != NULL) 1700 break; 1701 if (flag & O_NONBLOCK) { 1702 TUN_UNLOCK(tp); 1703 return (EWOULDBLOCK); 1704 } 1705 tp->tun_flags |= TUN_RWAIT; 1706 error = mtx_sleep(tp, &tp->tun_mtx, PCATCH | (PZERO + 1), 1707 "tunread", 0); 1708 if (error != 0) { 1709 TUN_UNLOCK(tp); 1710 return (error); 1711 } 1712 } 1713 TUN_UNLOCK(tp); 1714 1715 if ((tp->tun_flags & TUN_L2) != 0) 1716 BPF_MTAP(ifp, m); 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 1749 static int 1750 tunwrite_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 (eh && (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 && virtio_net_rx_csum(m, &vhdr->hdr)) { 1778 m_freem(m); 1779 return (0); 1780 } 1781 1782 /* Pass packet up to parent. */ 1783 CURVNET_SET(ifp->if_vnet); 1784 NET_EPOCH_ENTER(et); 1785 (*ifp->if_input)(ifp, m); 1786 NET_EPOCH_EXIT(et); 1787 CURVNET_RESTORE(); 1788 /* ibytes are counted in parent */ 1789 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 1790 return (0); 1791 } 1792 1793 static int 1794 tunwrite_l3(struct tuntap_softc *tp, struct mbuf *m) 1795 { 1796 struct epoch_tracker et; 1797 struct ifnet *ifp; 1798 int family, isr; 1799 1800 ifp = TUN2IFP(tp); 1801 /* Could be unlocked read? */ 1802 TUN_LOCK(tp); 1803 if (tp->tun_flags & TUN_IFHEAD) { 1804 TUN_UNLOCK(tp); 1805 if (m->m_len < sizeof(family) && 1806 (m = m_pullup(m, sizeof(family))) == NULL) 1807 return (ENOBUFS); 1808 family = ntohl(*mtod(m, u_int32_t *)); 1809 m_adj(m, sizeof(family)); 1810 } else { 1811 TUN_UNLOCK(tp); 1812 family = AF_INET; 1813 } 1814 1815 BPF_MTAP2(ifp, &family, sizeof(family), m); 1816 1817 switch (family) { 1818 #ifdef INET 1819 case AF_INET: 1820 isr = NETISR_IP; 1821 break; 1822 #endif 1823 #ifdef INET6 1824 case AF_INET6: 1825 isr = NETISR_IPV6; 1826 break; 1827 #endif 1828 default: 1829 m_freem(m); 1830 return (EAFNOSUPPORT); 1831 } 1832 random_harvest_queue(m, sizeof(*m), RANDOM_NET_TUN); 1833 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 1834 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 1835 CURVNET_SET(ifp->if_vnet); 1836 M_SETFIB(m, ifp->if_fib); 1837 NET_EPOCH_ENTER(et); 1838 netisr_dispatch(isr, m); 1839 NET_EPOCH_EXIT(et); 1840 CURVNET_RESTORE(); 1841 return (0); 1842 } 1843 1844 /* 1845 * the cdevsw write interface - an atomic write is a packet - or else! 1846 */ 1847 static int 1848 tunwrite(struct cdev *dev, struct uio *uio, int flag) 1849 { 1850 struct virtio_net_hdr_mrg_rxbuf vhdr; 1851 struct tuntap_softc *tp; 1852 struct ifnet *ifp; 1853 struct mbuf *m; 1854 uint32_t mru; 1855 int align, vhdrlen, error; 1856 bool l2tun; 1857 1858 tp = dev->si_drv1; 1859 ifp = TUN2IFP(tp); 1860 TUNDEBUG(ifp, "tunwrite\n"); 1861 if ((ifp->if_flags & IFF_UP) != IFF_UP) 1862 /* ignore silently */ 1863 return (0); 1864 1865 if (uio->uio_resid == 0) 1866 return (0); 1867 1868 l2tun = (tp->tun_flags & TUN_L2) != 0; 1869 mru = l2tun ? TAPMRU : TUNMRU; 1870 vhdrlen = tp->tun_vhdrlen; 1871 align = 0; 1872 if (l2tun) { 1873 align = ETHER_ALIGN; 1874 mru += vhdrlen; 1875 } else if ((tp->tun_flags & TUN_IFHEAD) != 0) 1876 mru += sizeof(uint32_t); /* family */ 1877 if (uio->uio_resid < 0 || uio->uio_resid > mru) { 1878 TUNDEBUG(ifp, "len=%zd!\n", uio->uio_resid); 1879 return (EIO); 1880 } 1881 1882 if (vhdrlen > 0) { 1883 error = uiomove(&vhdr, vhdrlen, uio); 1884 if (error != 0) 1885 return (error); 1886 TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, " 1887 "gs %u, cs %u, co %u\n", vhdr.hdr.flags, 1888 vhdr.hdr.gso_type, vhdr.hdr.hdr_len, 1889 vhdr.hdr.gso_size, vhdr.hdr.csum_start, 1890 vhdr.hdr.csum_offset); 1891 } 1892 1893 if ((m = m_uiotombuf(uio, M_NOWAIT, 0, align, M_PKTHDR)) == NULL) { 1894 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 1895 return (ENOBUFS); 1896 } 1897 1898 m->m_pkthdr.rcvif = ifp; 1899 #ifdef MAC 1900 mac_ifnet_create_mbuf(ifp, m); 1901 #endif 1902 1903 if (l2tun) 1904 return (tunwrite_l2(tp, m, vhdrlen > 0 ? &vhdr : NULL)); 1905 1906 return (tunwrite_l3(tp, m)); 1907 } 1908 1909 /* 1910 * tunpoll - the poll interface, this is only useful on reads 1911 * really. The write detect always returns true, write never blocks 1912 * anyway, it either accepts the packet or drops it. 1913 */ 1914 static int 1915 tunpoll(struct cdev *dev, int events, struct thread *td) 1916 { 1917 struct tuntap_softc *tp = dev->si_drv1; 1918 struct ifnet *ifp = TUN2IFP(tp); 1919 int revents = 0; 1920 1921 TUNDEBUG(ifp, "tunpoll\n"); 1922 1923 if (events & (POLLIN | POLLRDNORM)) { 1924 IFQ_LOCK(&ifp->if_snd); 1925 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 1926 TUNDEBUG(ifp, "tunpoll q=%d\n", ifp->if_snd.ifq_len); 1927 revents |= events & (POLLIN | POLLRDNORM); 1928 } else { 1929 TUNDEBUG(ifp, "tunpoll waiting\n"); 1930 selrecord(td, &tp->tun_rsel); 1931 } 1932 IFQ_UNLOCK(&ifp->if_snd); 1933 } 1934 revents |= events & (POLLOUT | POLLWRNORM); 1935 1936 return (revents); 1937 } 1938 1939 /* 1940 * tunkqfilter - support for the kevent() system call. 1941 */ 1942 static int 1943 tunkqfilter(struct cdev *dev, struct knote *kn) 1944 { 1945 struct tuntap_softc *tp = dev->si_drv1; 1946 struct ifnet *ifp = TUN2IFP(tp); 1947 1948 switch(kn->kn_filter) { 1949 case EVFILT_READ: 1950 TUNDEBUG(ifp, "%s kqfilter: EVFILT_READ, minor = %#x\n", 1951 ifp->if_xname, dev2unit(dev)); 1952 kn->kn_fop = &tun_read_filterops; 1953 break; 1954 1955 case EVFILT_WRITE: 1956 TUNDEBUG(ifp, "%s kqfilter: EVFILT_WRITE, minor = %#x\n", 1957 ifp->if_xname, dev2unit(dev)); 1958 kn->kn_fop = &tun_write_filterops; 1959 break; 1960 1961 default: 1962 TUNDEBUG(ifp, "%s kqfilter: invalid filter, minor = %#x\n", 1963 ifp->if_xname, dev2unit(dev)); 1964 return(EINVAL); 1965 } 1966 1967 kn->kn_hook = tp; 1968 knlist_add(&tp->tun_rsel.si_note, kn, 0); 1969 1970 return (0); 1971 } 1972 1973 /* 1974 * Return true of there is data in the interface queue. 1975 */ 1976 static int 1977 tunkqread(struct knote *kn, long hint) 1978 { 1979 int ret; 1980 struct tuntap_softc *tp = kn->kn_hook; 1981 struct cdev *dev = tp->tun_dev; 1982 struct ifnet *ifp = TUN2IFP(tp); 1983 1984 if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) { 1985 TUNDEBUG(ifp, 1986 "%s have data in the queue. Len = %d, minor = %#x\n", 1987 ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev)); 1988 ret = 1; 1989 } else { 1990 TUNDEBUG(ifp, 1991 "%s waiting for data, minor = %#x\n", ifp->if_xname, 1992 dev2unit(dev)); 1993 ret = 0; 1994 } 1995 1996 return (ret); 1997 } 1998 1999 /* 2000 * Always can write, always return MTU in kn->data. 2001 */ 2002 static int 2003 tunkqwrite(struct knote *kn, long hint) 2004 { 2005 struct tuntap_softc *tp = kn->kn_hook; 2006 struct ifnet *ifp = TUN2IFP(tp); 2007 2008 kn->kn_data = ifp->if_mtu; 2009 2010 return (1); 2011 } 2012 2013 static void 2014 tunkqdetach(struct knote *kn) 2015 { 2016 struct tuntap_softc *tp = kn->kn_hook; 2017 2018 knlist_remove(&tp->tun_rsel.si_note, kn, 0); 2019 } 2020