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> 110 111 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 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 */ 178 static struct mtx tunmtx; 179 static eventhandler_tag arrival_tag; 180 static eventhandler_tag clone_tag; 181 static const char tunname[] = "tun"; 182 static const char tapname[] = "tap"; 183 static const char vmnetname[] = "vmnet"; 184 static MALLOC_DEFINE(M_TUN, tunname, "Tunnel Interface"); 185 static int tundebug = 0; 186 static int tundclone = 1; 187 static int tap_allow_uopen = 0; /* allow user devfs cloning */ 188 static int tapuponopen = 0; /* IFF_UP on open() */ 189 static int tapdclone = 1; /* enable devfs cloning */ 190 191 static TAILQ_HEAD(,tuntap_softc) tunhead = TAILQ_HEAD_INITIALIZER(tunhead); 192 SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, ""); 193 194 static struct sx tun_ioctl_sx; 195 SX_SYSINIT(tun_ioctl_sx, &tun_ioctl_sx, "tun_ioctl"); 196 197 SYSCTL_DECL(_net_link); 198 /* tun */ 199 static SYSCTL_NODE(_net_link, OID_AUTO, tun, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 200 "IP tunnel software network interface"); 201 SYSCTL_INT(_net_link_tun, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tundclone, 0, 202 "Enable legacy devfs interface creation"); 203 204 /* tap */ 205 static SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 206 "Ethernet tunnel software network interface"); 207 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tap_allow_uopen, 0, 208 "Enable legacy devfs interface creation for all users"); 209 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0, 210 "Bring interface up when /dev/tap is opened"); 211 SYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tapdclone, 0, 212 "Enable legacy devfs interface creation"); 213 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tundebug, 0, ""); 214 215 static int tun_create_device(struct tuntap_driver *drv, int unit, 216 struct ucred *cr, struct cdev **dev, const char *name); 217 static int tun_busy_locked(struct tuntap_softc *tp); 218 static void tun_unbusy_locked(struct tuntap_softc *tp); 219 static int tun_busy(struct tuntap_softc *tp); 220 static void tun_unbusy(struct tuntap_softc *tp); 221 222 static int tuntap_name2info(const char *name, int *unit, int *flags); 223 static void tunclone(void *arg, struct ucred *cred, char *name, 224 int namelen, struct cdev **dev); 225 static void tuncreate(struct cdev *dev); 226 static void tundtor(void *data); 227 static void tunrename(void *arg, struct ifnet *ifp); 228 static int tunifioctl(struct ifnet *, u_long, caddr_t); 229 static void tuninit(struct ifnet *); 230 static void tunifinit(void *xtp); 231 static int tuntapmodevent(module_t, int, void *); 232 static int tunoutput(struct ifnet *, struct mbuf *, 233 const struct sockaddr *, struct route *ro); 234 static void tunstart(struct ifnet *); 235 static void tunstart_l2(struct ifnet *); 236 237 static int tun_clone_match(struct if_clone *ifc, const char *name); 238 static int tap_clone_match(struct if_clone *ifc, const char *name); 239 static int vmnet_clone_match(struct if_clone *ifc, const char *name); 240 static int tun_clone_create(struct if_clone *, char *, size_t, 241 struct ifc_data *, struct ifnet **); 242 static int tun_clone_destroy(struct if_clone *, struct ifnet *, uint32_t); 243 static void tun_vnethdr_set(struct ifnet *ifp, int vhdrlen); 244 245 static d_open_t tunopen; 246 static d_read_t tunread; 247 static d_write_t tunwrite; 248 static d_ioctl_t tunioctl; 249 static d_poll_t tunpoll; 250 static d_kqfilter_t tunkqfilter; 251 252 static int tunkqread(struct knote *, long); 253 static int tunkqwrite(struct knote *, long); 254 static void tunkqdetach(struct knote *); 255 256 static struct filterops tun_read_filterops = { 257 .f_isfd = 1, 258 .f_attach = NULL, 259 .f_detach = tunkqdetach, 260 .f_event = tunkqread, 261 }; 262 263 static struct filterops tun_write_filterops = { 264 .f_isfd = 1, 265 .f_attach = NULL, 266 .f_detach = tunkqdetach, 267 .f_event = tunkqwrite, 268 }; 269 270 static 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 }; 331 332 struct tuntap_driver_cloner { 333 SLIST_ENTRY(tuntap_driver_cloner) link; 334 struct tuntap_driver *drv; 335 struct if_clone *cloner; 336 }; 337 338 VNET_DEFINE_STATIC(SLIST_HEAD(, tuntap_driver_cloner), tuntap_driver_cloners) = 339 SLIST_HEAD_INITIALIZER(tuntap_driver_cloners); 340 341 #define V_tuntap_driver_cloners VNET(tuntap_driver_cloners) 342 343 /* 344 * Mechanism for marking a tunnel device as busy so that we can safely do some 345 * orthogonal operations (such as operations on devices) without racing against 346 * tun_destroy. tun_destroy will wait on the condvar if we're at all busy or 347 * open, to be woken up when the condition is alleviated. 348 */ 349 static int 350 tun_busy_locked(struct tuntap_softc *tp) 351 { 352 353 TUN_LOCK_ASSERT(tp); 354 if ((tp->tun_flags & TUN_DYING) != 0) { 355 /* 356 * Perhaps unintuitive, but the device is busy going away. 357 * Other interpretations of EBUSY from tun_busy make little 358 * sense, since making a busy device even more busy doesn't 359 * sound like a problem. 360 */ 361 return (EBUSY); 362 } 363 364 ++tp->tun_busy; 365 return (0); 366 } 367 368 static void 369 tun_unbusy_locked(struct tuntap_softc *tp) 370 { 371 372 TUN_LOCK_ASSERT(tp); 373 KASSERT(tp->tun_busy != 0, ("tun_unbusy: called for non-busy tunnel")); 374 375 --tp->tun_busy; 376 /* Wake up anything that may be waiting on our busy tunnel. */ 377 if (tp->tun_busy == 0) 378 cv_broadcast(&tp->tun_cv); 379 } 380 381 static int 382 tun_busy(struct tuntap_softc *tp) 383 { 384 int ret; 385 386 TUN_LOCK(tp); 387 ret = tun_busy_locked(tp); 388 TUN_UNLOCK(tp); 389 return (ret); 390 } 391 392 static void 393 tun_unbusy(struct tuntap_softc *tp) 394 { 395 396 TUN_LOCK(tp); 397 tun_unbusy_locked(tp); 398 TUN_UNLOCK(tp); 399 } 400 401 /* 402 * Sets unit and/or flags given the device name. Must be called with correct 403 * vnet context. 404 */ 405 static int 406 tuntap_name2info(const char *name, int *outunit, int *outflags) 407 { 408 struct tuntap_driver *drv; 409 struct tuntap_driver_cloner *drvc; 410 char *dname; 411 int flags, unit; 412 bool found; 413 414 if (name == NULL) 415 return (EINVAL); 416 417 /* 418 * Needed for dev_stdclone, but dev_stdclone will not modify, it just 419 * wants to be able to pass back a char * through the second param. We 420 * will always set that as NULL here, so we'll fake it. 421 */ 422 dname = __DECONST(char *, name); 423 found = false; 424 425 KASSERT(!SLIST_EMPTY(&V_tuntap_driver_cloners), 426 ("tuntap_driver_cloners failed to initialize")); 427 SLIST_FOREACH(drvc, &V_tuntap_driver_cloners, link) { 428 KASSERT(drvc->drv != NULL, 429 ("tuntap_driver_cloners entry not properly initialized")); 430 drv = drvc->drv; 431 432 if (strcmp(name, drv->cdevsw.d_name) == 0) { 433 found = true; 434 unit = -1; 435 flags = drv->ident_flags; 436 break; 437 } 438 439 if (dev_stdclone(dname, NULL, drv->cdevsw.d_name, &unit) == 1) { 440 found = true; 441 flags = drv->ident_flags; 442 break; 443 } 444 } 445 446 if (!found) 447 return (ENXIO); 448 449 if (outunit != NULL) 450 *outunit = unit; 451 if (outflags != NULL) 452 *outflags = flags; 453 return (0); 454 } 455 456 /* 457 * Get driver information from a set of flags specified. Masks the identifying 458 * part of the flags and compares it against all of the available 459 * tuntap_drivers. Must be called with correct vnet context. 460 */ 461 static struct tuntap_driver * 462 tuntap_driver_from_flags(int tun_flags) 463 { 464 struct tuntap_driver *drv; 465 struct tuntap_driver_cloner *drvc; 466 467 KASSERT(!SLIST_EMPTY(&V_tuntap_driver_cloners), 468 ("tuntap_driver_cloners failed to initialize")); 469 SLIST_FOREACH(drvc, &V_tuntap_driver_cloners, link) { 470 KASSERT(drvc->drv != NULL, 471 ("tuntap_driver_cloners entry not properly initialized")); 472 drv = drvc->drv; 473 if ((tun_flags & TUN_DRIVER_IDENT_MASK) == drv->ident_flags) 474 return (drv); 475 } 476 477 return (NULL); 478 } 479 480 static int 481 tun_clone_match(struct if_clone *ifc, const char *name) 482 { 483 int tunflags; 484 485 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 486 if ((tunflags & TUN_L2) == 0) 487 return (1); 488 } 489 490 return (0); 491 } 492 493 static int 494 tap_clone_match(struct if_clone *ifc, const char *name) 495 { 496 int tunflags; 497 498 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 499 if ((tunflags & (TUN_L2 | TUN_VMNET)) == TUN_L2) 500 return (1); 501 } 502 503 return (0); 504 } 505 506 static int 507 vmnet_clone_match(struct if_clone *ifc, const char *name) 508 { 509 int tunflags; 510 511 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 512 if ((tunflags & TUN_VMNET) != 0) 513 return (1); 514 } 515 516 return (0); 517 } 518 519 static int 520 tun_clone_create(struct if_clone *ifc, char *name, size_t len, 521 struct ifc_data *ifd, struct ifnet **ifpp) 522 { 523 struct tuntap_driver *drv; 524 struct cdev *dev; 525 int err, i, tunflags, unit; 526 527 tunflags = 0; 528 /* The name here tells us exactly what we're creating */ 529 err = tuntap_name2info(name, &unit, &tunflags); 530 if (err != 0) 531 return (err); 532 533 drv = tuntap_driver_from_flags(tunflags); 534 if (drv == NULL) 535 return (ENXIO); 536 537 if (unit != -1) { 538 /* If this unit number is still available that's okay. */ 539 if (alloc_unr_specific(drv->unrhdr, unit) == -1) 540 return (EEXIST); 541 } else { 542 unit = alloc_unr(drv->unrhdr); 543 } 544 545 snprintf(name, IFNAMSIZ, "%s%d", drv->cdevsw.d_name, unit); 546 547 /* find any existing device, or allocate new unit number */ 548 dev = NULL; 549 i = clone_create(&drv->clones, &drv->cdevsw, &unit, &dev, 0); 550 /* No preexisting struct cdev *, create one */ 551 if (i != 0) 552 i = tun_create_device(drv, unit, NULL, &dev, name); 553 if (i == 0) { 554 dev_ref(dev); 555 tuncreate(dev); 556 struct tuntap_softc *tp = dev->si_drv1; 557 *ifpp = tp->tun_ifp; 558 } 559 560 return (i); 561 } 562 563 static void 564 tunclone(void *arg, struct ucred *cred, char *name, int namelen, 565 struct cdev **dev) 566 { 567 char devname[SPECNAMELEN + 1]; 568 struct tuntap_driver *drv; 569 int append_unit, i, u, tunflags; 570 bool mayclone; 571 572 if (*dev != NULL) 573 return; 574 575 tunflags = 0; 576 CURVNET_SET(CRED_TO_VNET(cred)); 577 if (tuntap_name2info(name, &u, &tunflags) != 0) 578 goto out; /* Not recognized */ 579 580 if (u != -1 && u > IF_MAXUNIT) 581 goto out; /* Unit number too high */ 582 583 mayclone = priv_check_cred(cred, PRIV_NET_IFCREATE) == 0; 584 if ((tunflags & TUN_L2) != 0) { 585 /* tap/vmnet allow user open with a sysctl */ 586 mayclone = (mayclone || tap_allow_uopen) && tapdclone; 587 } else { 588 mayclone = mayclone && tundclone; 589 } 590 591 /* 592 * If tun cloning is enabled, only the superuser can create an 593 * interface. 594 */ 595 if (!mayclone) 596 goto out; 597 598 if (u == -1) 599 append_unit = 1; 600 else 601 append_unit = 0; 602 603 drv = tuntap_driver_from_flags(tunflags); 604 if (drv == NULL) 605 goto out; 606 607 /* find any existing device, or allocate new unit number */ 608 i = clone_create(&drv->clones, &drv->cdevsw, &u, dev, 0); 609 if (i) { 610 if (append_unit) { 611 namelen = snprintf(devname, sizeof(devname), "%s%d", 612 name, u); 613 name = devname; 614 } 615 616 i = tun_create_device(drv, u, cred, dev, name); 617 } 618 if (i == 0) { 619 dev_ref(*dev); 620 if_clone_create(name, namelen, NULL); 621 } 622 out: 623 CURVNET_RESTORE(); 624 } 625 626 static void 627 tun_destroy(struct tuntap_softc *tp) 628 { 629 630 TUN_LOCK(tp); 631 tp->tun_flags |= TUN_DYING; 632 if (tp->tun_busy != 0) 633 cv_wait_unlock(&tp->tun_cv, &tp->tun_mtx); 634 else 635 TUN_UNLOCK(tp); 636 637 CURVNET_SET(TUN2IFP(tp)->if_vnet); 638 639 /* destroy_dev will take care of any alias. */ 640 destroy_dev(tp->tun_dev); 641 seldrain(&tp->tun_rsel); 642 knlist_clear(&tp->tun_rsel.si_note, 0); 643 knlist_destroy(&tp->tun_rsel.si_note); 644 if ((tp->tun_flags & TUN_L2) != 0) { 645 ether_ifdetach(TUN2IFP(tp)); 646 } else { 647 bpfdetach(TUN2IFP(tp)); 648 if_detach(TUN2IFP(tp)); 649 } 650 sx_xlock(&tun_ioctl_sx); 651 TUN2IFP(tp)->if_softc = NULL; 652 sx_xunlock(&tun_ioctl_sx); 653 free_unr(tp->tun_drv->unrhdr, TUN2IFP(tp)->if_dunit); 654 if_free(TUN2IFP(tp)); 655 mtx_destroy(&tp->tun_mtx); 656 cv_destroy(&tp->tun_cv); 657 free(tp, M_TUN); 658 CURVNET_RESTORE(); 659 } 660 661 static int 662 tun_clone_destroy(struct if_clone *ifc __unused, struct ifnet *ifp, uint32_t flags) 663 { 664 struct tuntap_softc *tp = ifp->if_softc; 665 666 mtx_lock(&tunmtx); 667 TAILQ_REMOVE(&tunhead, tp, tun_list); 668 mtx_unlock(&tunmtx); 669 tun_destroy(tp); 670 671 return (0); 672 } 673 674 static void 675 vnet_tun_init(const void *unused __unused) 676 { 677 struct tuntap_driver *drv; 678 struct tuntap_driver_cloner *drvc; 679 int i; 680 681 for (i = 0; i < nitems(tuntap_drivers); ++i) { 682 drv = &tuntap_drivers[i]; 683 drvc = malloc(sizeof(*drvc), M_TUN, M_WAITOK | M_ZERO); 684 685 drvc->drv = drv; 686 struct if_clone_addreq req = { 687 .match_f = drv->clone_match_fn, 688 .create_f = drv->clone_create_fn, 689 .destroy_f = drv->clone_destroy_fn, 690 }; 691 drvc->cloner = ifc_attach_cloner(drv->cdevsw.d_name, &req); 692 SLIST_INSERT_HEAD(&V_tuntap_driver_cloners, drvc, link); 693 }; 694 } 695 VNET_SYSINIT(vnet_tun_init, SI_SUB_PROTO_IF, SI_ORDER_ANY, 696 vnet_tun_init, NULL); 697 698 static void 699 vnet_tun_uninit(const void *unused __unused) 700 { 701 struct tuntap_driver_cloner *drvc; 702 703 while (!SLIST_EMPTY(&V_tuntap_driver_cloners)) { 704 drvc = SLIST_FIRST(&V_tuntap_driver_cloners); 705 SLIST_REMOVE_HEAD(&V_tuntap_driver_cloners, link); 706 707 if_clone_detach(drvc->cloner); 708 free(drvc, M_TUN); 709 } 710 } 711 VNET_SYSUNINIT(vnet_tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY, 712 vnet_tun_uninit, NULL); 713 714 static void 715 tun_uninit(const void *unused __unused) 716 { 717 struct tuntap_driver *drv; 718 struct tuntap_softc *tp; 719 int i; 720 721 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, arrival_tag); 722 EVENTHANDLER_DEREGISTER(dev_clone, clone_tag); 723 724 mtx_lock(&tunmtx); 725 while ((tp = TAILQ_FIRST(&tunhead)) != NULL) { 726 TAILQ_REMOVE(&tunhead, tp, tun_list); 727 mtx_unlock(&tunmtx); 728 tun_destroy(tp); 729 mtx_lock(&tunmtx); 730 } 731 mtx_unlock(&tunmtx); 732 for (i = 0; i < nitems(tuntap_drivers); ++i) { 733 drv = &tuntap_drivers[i]; 734 delete_unrhdr(drv->unrhdr); 735 clone_cleanup(&drv->clones); 736 } 737 mtx_destroy(&tunmtx); 738 } 739 SYSUNINIT(tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY, tun_uninit, NULL); 740 741 static struct tuntap_driver * 742 tuntap_driver_from_ifnet(const struct ifnet *ifp) 743 { 744 struct tuntap_driver *drv; 745 int i; 746 747 if (ifp == NULL) 748 return (NULL); 749 750 for (i = 0; i < nitems(tuntap_drivers); ++i) { 751 drv = &tuntap_drivers[i]; 752 if (strcmp(ifp->if_dname, drv->cdevsw.d_name) == 0) 753 return (drv); 754 } 755 756 return (NULL); 757 } 758 759 static int 760 tuntapmodevent(module_t mod, int type, void *data) 761 { 762 struct tuntap_driver *drv; 763 int i; 764 765 switch (type) { 766 case MOD_LOAD: 767 mtx_init(&tunmtx, "tunmtx", NULL, MTX_DEF); 768 for (i = 0; i < nitems(tuntap_drivers); ++i) { 769 drv = &tuntap_drivers[i]; 770 clone_setup(&drv->clones); 771 drv->unrhdr = new_unrhdr(0, IF_MAXUNIT, &tunmtx); 772 } 773 arrival_tag = EVENTHANDLER_REGISTER(ifnet_arrival_event, 774 tunrename, 0, 1000); 775 if (arrival_tag == NULL) 776 return (ENOMEM); 777 clone_tag = EVENTHANDLER_REGISTER(dev_clone, tunclone, 0, 1000); 778 if (clone_tag == NULL) 779 return (ENOMEM); 780 break; 781 case MOD_UNLOAD: 782 /* See tun_uninit, so it's done after the vnet_sysuninit() */ 783 break; 784 default: 785 return EOPNOTSUPP; 786 } 787 return 0; 788 } 789 790 static moduledata_t tuntap_mod = { 791 "if_tuntap", 792 tuntapmodevent, 793 0 794 }; 795 796 /* We'll only ever have these two, so no need for a macro. */ 797 static moduledata_t tun_mod = { "if_tun", NULL, 0 }; 798 static moduledata_t tap_mod = { "if_tap", NULL, 0 }; 799 800 DECLARE_MODULE(if_tuntap, tuntap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 801 MODULE_VERSION(if_tuntap, 1); 802 DECLARE_MODULE(if_tun, tun_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 803 MODULE_VERSION(if_tun, 1); 804 DECLARE_MODULE(if_tap, tap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 805 MODULE_VERSION(if_tap, 1); 806 807 static int 808 tun_create_device(struct tuntap_driver *drv, int unit, struct ucred *cr, 809 struct cdev **dev, const char *name) 810 { 811 struct make_dev_args args; 812 struct tuntap_softc *tp; 813 int error; 814 815 tp = malloc(sizeof(*tp), M_TUN, M_WAITOK | M_ZERO); 816 mtx_init(&tp->tun_mtx, "tun_mtx", NULL, MTX_DEF); 817 cv_init(&tp->tun_cv, "tun_condvar"); 818 tp->tun_flags = drv->ident_flags; 819 tp->tun_drv = drv; 820 821 make_dev_args_init(&args); 822 if (cr != NULL) 823 args.mda_flags = MAKEDEV_REF; 824 args.mda_devsw = &drv->cdevsw; 825 args.mda_cr = cr; 826 args.mda_uid = UID_UUCP; 827 args.mda_gid = GID_DIALER; 828 args.mda_mode = 0600; 829 args.mda_unit = unit; 830 args.mda_si_drv1 = tp; 831 error = make_dev_s(&args, dev, "%s", name); 832 if (error != 0) { 833 free(tp, M_TUN); 834 return (error); 835 } 836 837 KASSERT((*dev)->si_drv1 != NULL, 838 ("Failed to set si_drv1 at %s creation", name)); 839 tp->tun_dev = *dev; 840 knlist_init_mtx(&tp->tun_rsel.si_note, &tp->tun_mtx); 841 mtx_lock(&tunmtx); 842 TAILQ_INSERT_TAIL(&tunhead, tp, tun_list); 843 mtx_unlock(&tunmtx); 844 return (0); 845 } 846 847 static void 848 tunstart(struct ifnet *ifp) 849 { 850 struct tuntap_softc *tp = ifp->if_softc; 851 struct mbuf *m; 852 853 TUNDEBUG(ifp, "starting\n"); 854 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 855 IFQ_LOCK(&ifp->if_snd); 856 IFQ_POLL_NOLOCK(&ifp->if_snd, m); 857 if (m == NULL) { 858 IFQ_UNLOCK(&ifp->if_snd); 859 return; 860 } 861 IFQ_UNLOCK(&ifp->if_snd); 862 } 863 864 TUN_LOCK(tp); 865 if (tp->tun_flags & TUN_RWAIT) { 866 tp->tun_flags &= ~TUN_RWAIT; 867 wakeup(tp); 868 } 869 selwakeuppri(&tp->tun_rsel, PZERO + 1); 870 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 871 if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio) { 872 TUN_UNLOCK(tp); 873 pgsigio(&tp->tun_sigio, SIGIO, 0); 874 } else 875 TUN_UNLOCK(tp); 876 } 877 878 /* 879 * tunstart_l2 880 * 881 * queue packets from higher level ready to put out 882 */ 883 static void 884 tunstart_l2(struct ifnet *ifp) 885 { 886 struct tuntap_softc *tp = ifp->if_softc; 887 888 TUNDEBUG(ifp, "starting\n"); 889 890 /* 891 * do not junk pending output if we are in VMnet mode. 892 * XXX: can this do any harm because of queue overflow? 893 */ 894 895 TUN_LOCK(tp); 896 if (((tp->tun_flags & TUN_VMNET) == 0) && 897 ((tp->tun_flags & TUN_READY) != TUN_READY)) { 898 struct mbuf *m; 899 900 /* Unlocked read. */ 901 TUNDEBUG(ifp, "not ready, tun_flags = 0x%x\n", tp->tun_flags); 902 903 for (;;) { 904 IF_DEQUEUE(&ifp->if_snd, m); 905 if (m != NULL) { 906 m_freem(m); 907 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 908 } else 909 break; 910 } 911 TUN_UNLOCK(tp); 912 913 return; 914 } 915 916 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 917 918 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 919 if (tp->tun_flags & TUN_RWAIT) { 920 tp->tun_flags &= ~TUN_RWAIT; 921 wakeup(tp); 922 } 923 924 if ((tp->tun_flags & TUN_ASYNC) && (tp->tun_sigio != NULL)) { 925 TUN_UNLOCK(tp); 926 pgsigio(&tp->tun_sigio, SIGIO, 0); 927 TUN_LOCK(tp); 928 } 929 930 selwakeuppri(&tp->tun_rsel, PZERO+1); 931 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 932 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); /* obytes are counted in ether_output */ 933 } 934 935 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 936 TUN_UNLOCK(tp); 937 } /* tunstart_l2 */ 938 939 static int 940 tap_transmit(struct ifnet *ifp, struct mbuf *m) 941 { 942 int error; 943 944 BPF_MTAP(ifp, m); 945 IFQ_HANDOFF(ifp, m, error); 946 return (error); 947 } 948 949 /* XXX: should return an error code so it can fail. */ 950 static void 951 tuncreate(struct cdev *dev) 952 { 953 struct tuntap_driver *drv; 954 struct tuntap_softc *tp; 955 struct ifnet *ifp; 956 struct ether_addr eaddr; 957 int iflags; 958 u_char type; 959 960 tp = dev->si_drv1; 961 KASSERT(tp != NULL, 962 ("si_drv1 should have been initialized at creation")); 963 964 drv = tp->tun_drv; 965 iflags = IFF_MULTICAST; 966 if ((tp->tun_flags & TUN_L2) != 0) { 967 type = IFT_ETHER; 968 iflags |= IFF_BROADCAST | IFF_SIMPLEX; 969 } else { 970 type = IFT_PPP; 971 iflags |= IFF_POINTOPOINT; 972 } 973 ifp = tp->tun_ifp = if_alloc(type); 974 if (ifp == NULL) 975 panic("%s%d: failed to if_alloc() interface.\n", 976 drv->cdevsw.d_name, dev2unit(dev)); 977 ifp->if_softc = tp; 978 if_initname(ifp, drv->cdevsw.d_name, dev2unit(dev)); 979 ifp->if_ioctl = tunifioctl; 980 ifp->if_flags = iflags; 981 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 982 ifp->if_capabilities |= IFCAP_LINKSTATE; 983 if ((tp->tun_flags & TUN_L2) != 0) 984 ifp->if_capabilities |= 985 IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO; 986 ifp->if_capenable |= IFCAP_LINKSTATE; 987 988 if ((tp->tun_flags & TUN_L2) != 0) { 989 ifp->if_init = tunifinit; 990 ifp->if_start = tunstart_l2; 991 ifp->if_transmit = tap_transmit; 992 ifp->if_qflush = if_qflush; 993 994 ether_gen_addr(ifp, &eaddr); 995 ether_ifattach(ifp, eaddr.octet); 996 } else { 997 ifp->if_mtu = TUNMTU; 998 ifp->if_start = tunstart; 999 ifp->if_output = tunoutput; 1000 1001 ifp->if_snd.ifq_drv_maxlen = 0; 1002 IFQ_SET_READY(&ifp->if_snd); 1003 1004 if_attach(ifp); 1005 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 1006 } 1007 1008 TUN_LOCK(tp); 1009 tp->tun_flags |= TUN_INITED; 1010 TUN_UNLOCK(tp); 1011 1012 TUNDEBUG(ifp, "interface %s is created, minor = %#x\n", 1013 ifp->if_xname, dev2unit(dev)); 1014 } 1015 1016 static void 1017 tunrename(void *arg __unused, struct ifnet *ifp) 1018 { 1019 struct tuntap_softc *tp; 1020 int error; 1021 1022 if ((ifp->if_flags & IFF_RENAMING) == 0) 1023 return; 1024 1025 if (tuntap_driver_from_ifnet(ifp) == NULL) 1026 return; 1027 1028 /* 1029 * We need to grab the ioctl sx long enough to make sure the softc is 1030 * still there. If it is, we can safely try to busy the tun device. 1031 * The busy may fail if the device is currently dying, in which case 1032 * we do nothing. If it doesn't fail, the busy count stops the device 1033 * from dying until we've created the alias (that will then be 1034 * subsequently destroyed). 1035 */ 1036 sx_xlock(&tun_ioctl_sx); 1037 tp = ifp->if_softc; 1038 if (tp == NULL) { 1039 sx_xunlock(&tun_ioctl_sx); 1040 return; 1041 } 1042 error = tun_busy(tp); 1043 sx_xunlock(&tun_ioctl_sx); 1044 if (error != 0) 1045 return; 1046 if (tp->tun_alias != NULL) { 1047 destroy_dev(tp->tun_alias); 1048 tp->tun_alias = NULL; 1049 } 1050 1051 if (strcmp(ifp->if_xname, tp->tun_dev->si_name) == 0) 1052 goto out; 1053 1054 /* 1055 * Failure's ok, aliases are created on a best effort basis. If a 1056 * tun user/consumer decides to rename the interface to conflict with 1057 * another device (non-ifnet) on the system, we will assume they know 1058 * what they are doing. make_dev_alias_p won't touch tun_alias on 1059 * failure, so we use it but ignore the return value. 1060 */ 1061 make_dev_alias_p(MAKEDEV_CHECKNAME, &tp->tun_alias, tp->tun_dev, "%s", 1062 ifp->if_xname); 1063 out: 1064 tun_unbusy(tp); 1065 } 1066 1067 static int 1068 tunopen(struct cdev *dev, int flag, int mode, struct thread *td) 1069 { 1070 struct ifnet *ifp; 1071 struct tuntap_softc *tp; 1072 int error __diagused, tunflags; 1073 1074 tunflags = 0; 1075 CURVNET_SET(TD_TO_VNET(td)); 1076 error = tuntap_name2info(dev->si_name, NULL, &tunflags); 1077 if (error != 0) { 1078 CURVNET_RESTORE(); 1079 return (error); /* Shouldn't happen */ 1080 } 1081 1082 tp = dev->si_drv1; 1083 KASSERT(tp != NULL, 1084 ("si_drv1 should have been initialized at creation")); 1085 1086 TUN_LOCK(tp); 1087 if ((tp->tun_flags & TUN_INITED) == 0) { 1088 TUN_UNLOCK(tp); 1089 CURVNET_RESTORE(); 1090 return (ENXIO); 1091 } 1092 if ((tp->tun_flags & (TUN_OPEN | TUN_DYING)) != 0) { 1093 TUN_UNLOCK(tp); 1094 CURVNET_RESTORE(); 1095 return (EBUSY); 1096 } 1097 1098 error = tun_busy_locked(tp); 1099 KASSERT(error == 0, ("Must be able to busy an unopen tunnel")); 1100 ifp = TUN2IFP(tp); 1101 1102 if ((tp->tun_flags & TUN_L2) != 0) { 1103 bcopy(IF_LLADDR(ifp), tp->tun_ether.octet, 1104 sizeof(tp->tun_ether.octet)); 1105 1106 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1107 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1108 1109 if (tapuponopen) 1110 ifp->if_flags |= IFF_UP; 1111 } 1112 1113 tp->tun_pid = td->td_proc->p_pid; 1114 tp->tun_flags |= TUN_OPEN; 1115 1116 if_link_state_change(ifp, LINK_STATE_UP); 1117 TUNDEBUG(ifp, "open\n"); 1118 TUN_UNLOCK(tp); 1119 1120 /* 1121 * This can fail with either ENOENT or EBUSY. This is in the middle of 1122 * d_open, so ENOENT should not be possible. EBUSY is possible, but 1123 * the only cdevpriv dtor being set will be tundtor and the softc being 1124 * passed is constant for a given cdev. We ignore the possible error 1125 * because of this as either "unlikely" or "not actually a problem." 1126 */ 1127 (void)devfs_set_cdevpriv(tp, tundtor); 1128 CURVNET_RESTORE(); 1129 return (0); 1130 } 1131 1132 /* 1133 * tundtor - tear down the device - mark i/f down & delete 1134 * routing info 1135 */ 1136 static void 1137 tundtor(void *data) 1138 { 1139 struct proc *p; 1140 struct tuntap_softc *tp; 1141 struct ifnet *ifp; 1142 bool l2tun; 1143 1144 tp = data; 1145 p = curproc; 1146 ifp = TUN2IFP(tp); 1147 1148 TUN_LOCK(tp); 1149 1150 /* 1151 * Realistically, we can't be obstinate here. This only means that the 1152 * tuntap device was closed out of order, and the last closer wasn't the 1153 * controller. These are still good to know about, though, as software 1154 * should avoid multiple processes with a tuntap device open and 1155 * ill-defined transfer of control (e.g., handoff, TUNSIFPID, close in 1156 * parent). 1157 */ 1158 if (p->p_pid != tp->tun_pid) { 1159 log(LOG_INFO, 1160 "pid %d (%s), %s: tun/tap protocol violation, non-controlling process closed last.\n", 1161 p->p_pid, p->p_comm, tp->tun_dev->si_name); 1162 } 1163 1164 /* 1165 * junk all pending output 1166 */ 1167 CURVNET_SET(ifp->if_vnet); 1168 1169 l2tun = false; 1170 if ((tp->tun_flags & TUN_L2) != 0) { 1171 l2tun = true; 1172 IF_DRAIN(&ifp->if_snd); 1173 } else { 1174 IFQ_PURGE(&ifp->if_snd); 1175 } 1176 1177 /* For vmnet, we won't do most of the address/route bits */ 1178 if ((tp->tun_flags & TUN_VMNET) != 0 || 1179 (l2tun && (ifp->if_flags & IFF_LINK0) != 0)) 1180 goto out; 1181 #if defined(INET) || defined(INET6) 1182 if (l2tun && tp->tun_lro_ready) { 1183 TUNDEBUG (ifp, "LRO disabled\n"); 1184 tcp_lro_free(&tp->tun_lro); 1185 tp->tun_lro_ready = false; 1186 } 1187 #endif 1188 if (ifp->if_flags & IFF_UP) { 1189 TUN_UNLOCK(tp); 1190 if_down(ifp); 1191 TUN_LOCK(tp); 1192 } 1193 1194 /* Delete all addresses and routes which reference this interface. */ 1195 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1196 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1197 TUN_UNLOCK(tp); 1198 if_purgeaddrs(ifp); 1199 TUN_LOCK(tp); 1200 } 1201 1202 out: 1203 if_link_state_change(ifp, LINK_STATE_DOWN); 1204 CURVNET_RESTORE(); 1205 1206 funsetown(&tp->tun_sigio); 1207 selwakeuppri(&tp->tun_rsel, PZERO + 1); 1208 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 1209 TUNDEBUG (ifp, "closed\n"); 1210 tp->tun_flags &= ~TUN_OPEN; 1211 tp->tun_pid = 0; 1212 tun_vnethdr_set(ifp, 0); 1213 1214 tun_unbusy_locked(tp); 1215 TUN_UNLOCK(tp); 1216 } 1217 1218 static void 1219 tuninit(struct ifnet *ifp) 1220 { 1221 struct tuntap_softc *tp = ifp->if_softc; 1222 1223 TUNDEBUG(ifp, "tuninit\n"); 1224 1225 TUN_LOCK(tp); 1226 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1227 if ((tp->tun_flags & TUN_L2) == 0) { 1228 ifp->if_flags |= IFF_UP; 1229 getmicrotime(&ifp->if_lastchange); 1230 TUN_UNLOCK(tp); 1231 } else { 1232 #if defined(INET) || defined(INET6) 1233 if (tcp_lro_init(&tp->tun_lro) == 0) { 1234 TUNDEBUG(ifp, "LRO enabled\n"); 1235 tp->tun_lro.ifp = ifp; 1236 tp->tun_lro_ready = true; 1237 } else { 1238 TUNDEBUG(ifp, "Could not enable LRO\n"); 1239 tp->tun_lro_ready = false; 1240 } 1241 #endif 1242 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1243 TUN_UNLOCK(tp); 1244 /* attempt to start output */ 1245 tunstart_l2(ifp); 1246 } 1247 1248 } 1249 1250 /* 1251 * Used only for l2 tunnel. 1252 */ 1253 static void 1254 tunifinit(void *xtp) 1255 { 1256 struct tuntap_softc *tp; 1257 1258 tp = (struct tuntap_softc *)xtp; 1259 tuninit(tp->tun_ifp); 1260 } 1261 1262 /* 1263 * To be called under TUN_LOCK. Update ifp->if_hwassist according to the 1264 * current value of ifp->if_capenable. 1265 */ 1266 static void 1267 tun_caps_changed(struct ifnet *ifp) 1268 { 1269 uint64_t hwassist = 0; 1270 1271 TUN_LOCK_ASSERT((struct tuntap_softc *)ifp->if_softc); 1272 if (ifp->if_capenable & IFCAP_TXCSUM) 1273 hwassist |= CSUM_TCP | CSUM_UDP; 1274 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) 1275 hwassist |= CSUM_TCP_IPV6 1276 | CSUM_UDP_IPV6; 1277 if (ifp->if_capenable & IFCAP_TSO4) 1278 hwassist |= CSUM_IP_TSO; 1279 if (ifp->if_capenable & IFCAP_TSO6) 1280 hwassist |= CSUM_IP6_TSO; 1281 ifp->if_hwassist = hwassist; 1282 } 1283 1284 /* 1285 * To be called under TUN_LOCK. Update tp->tun_vhdrlen and adjust 1286 * if_capabilities and if_capenable as needed. 1287 */ 1288 static void 1289 tun_vnethdr_set(struct ifnet *ifp, int vhdrlen) 1290 { 1291 struct tuntap_softc *tp = ifp->if_softc; 1292 1293 TUN_LOCK_ASSERT(tp); 1294 1295 if (tp->tun_vhdrlen == vhdrlen) 1296 return; 1297 1298 /* 1299 * Update if_capabilities to reflect the 1300 * functionalities offered by the virtio-net 1301 * header. 1302 */ 1303 if (vhdrlen != 0) 1304 ifp->if_capabilities |= 1305 TAP_VNET_HDR_CAPS; 1306 else 1307 ifp->if_capabilities &= 1308 ~TAP_VNET_HDR_CAPS; 1309 /* 1310 * Disable any capabilities that we don't 1311 * support anymore. 1312 */ 1313 ifp->if_capenable &= ifp->if_capabilities; 1314 tun_caps_changed(ifp); 1315 tp->tun_vhdrlen = vhdrlen; 1316 1317 TUNDEBUG(ifp, "vnet_hdr_len=%d, if_capabilities=%x\n", 1318 vhdrlen, ifp->if_capabilities); 1319 } 1320 1321 /* 1322 * Process an ioctl request. 1323 */ 1324 static int 1325 tunifioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1326 { 1327 struct ifreq *ifr = (struct ifreq *)data; 1328 struct tuntap_softc *tp; 1329 struct ifstat *ifs; 1330 struct ifmediareq *ifmr; 1331 int dummy, error = 0; 1332 bool l2tun; 1333 1334 ifmr = NULL; 1335 sx_xlock(&tun_ioctl_sx); 1336 tp = ifp->if_softc; 1337 if (tp == NULL) { 1338 error = ENXIO; 1339 goto bad; 1340 } 1341 l2tun = (tp->tun_flags & TUN_L2) != 0; 1342 switch(cmd) { 1343 case SIOCGIFSTATUS: 1344 ifs = (struct ifstat *)data; 1345 TUN_LOCK(tp); 1346 if (tp->tun_pid) 1347 snprintf(ifs->ascii, sizeof(ifs->ascii), 1348 "\tOpened by PID %d\n", tp->tun_pid); 1349 else 1350 ifs->ascii[0] = '\0'; 1351 TUN_UNLOCK(tp); 1352 break; 1353 case SIOCSIFADDR: 1354 if (l2tun) 1355 error = ether_ioctl(ifp, cmd, data); 1356 else 1357 tuninit(ifp); 1358 if (error == 0) 1359 TUNDEBUG(ifp, "address set\n"); 1360 break; 1361 case SIOCSIFMTU: 1362 ifp->if_mtu = ifr->ifr_mtu; 1363 TUNDEBUG(ifp, "mtu set\n"); 1364 break; 1365 case SIOCSIFFLAGS: 1366 case SIOCADDMULTI: 1367 case SIOCDELMULTI: 1368 break; 1369 case SIOCGIFMEDIA: 1370 if (!l2tun) { 1371 error = EINVAL; 1372 break; 1373 } 1374 1375 ifmr = (struct ifmediareq *)data; 1376 dummy = ifmr->ifm_count; 1377 ifmr->ifm_count = 1; 1378 ifmr->ifm_status = IFM_AVALID; 1379 ifmr->ifm_active = IFM_ETHER | IFM_FDX | IFM_1000_T; 1380 if (tp->tun_flags & TUN_OPEN) 1381 ifmr->ifm_status |= IFM_ACTIVE; 1382 ifmr->ifm_current = ifmr->ifm_active; 1383 if (dummy >= 1) { 1384 int media = IFM_ETHER; 1385 error = copyout(&media, ifmr->ifm_ulist, sizeof(int)); 1386 } 1387 break; 1388 case SIOCSIFCAP: 1389 TUN_LOCK(tp); 1390 ifp->if_capenable = ifr->ifr_reqcap; 1391 tun_caps_changed(ifp); 1392 TUN_UNLOCK(tp); 1393 VLAN_CAPABILITIES(ifp); 1394 break; 1395 default: 1396 if (l2tun) { 1397 error = ether_ioctl(ifp, cmd, data); 1398 } else { 1399 error = EINVAL; 1400 } 1401 } 1402 bad: 1403 sx_xunlock(&tun_ioctl_sx); 1404 return (error); 1405 } 1406 1407 /* 1408 * tunoutput - queue packets from higher level ready to put out. 1409 */ 1410 static int 1411 tunoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 1412 struct route *ro) 1413 { 1414 struct tuntap_softc *tp = ifp->if_softc; 1415 u_short cached_tun_flags; 1416 int error; 1417 u_int32_t af; 1418 1419 TUNDEBUG (ifp, "tunoutput\n"); 1420 1421 #ifdef MAC 1422 error = mac_ifnet_check_transmit(ifp, m0); 1423 if (error) { 1424 m_freem(m0); 1425 return (error); 1426 } 1427 #endif 1428 1429 /* Could be unlocked read? */ 1430 TUN_LOCK(tp); 1431 cached_tun_flags = tp->tun_flags; 1432 TUN_UNLOCK(tp); 1433 if ((cached_tun_flags & TUN_READY) != TUN_READY) { 1434 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 1435 m_freem (m0); 1436 return (EHOSTDOWN); 1437 } 1438 1439 if ((ifp->if_flags & IFF_UP) != IFF_UP) { 1440 m_freem (m0); 1441 return (EHOSTDOWN); 1442 } 1443 1444 /* BPF writes need to be handled specially. */ 1445 if (dst->sa_family == AF_UNSPEC) 1446 bcopy(dst->sa_data, &af, sizeof(af)); 1447 else 1448 af = RO_GET_FAMILY(ro, dst); 1449 1450 BPF_MTAP2(ifp, &af, sizeof(af), m0); 1451 1452 /* prepend sockaddr? this may abort if the mbuf allocation fails */ 1453 if (cached_tun_flags & TUN_LMODE) { 1454 /* allocate space for sockaddr */ 1455 M_PREPEND(m0, dst->sa_len, M_NOWAIT); 1456 1457 /* if allocation failed drop packet */ 1458 if (m0 == NULL) { 1459 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1); 1460 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 1461 return (ENOBUFS); 1462 } else { 1463 bcopy(dst, m0->m_data, dst->sa_len); 1464 } 1465 } 1466 1467 if (cached_tun_flags & TUN_IFHEAD) { 1468 /* Prepend the address family */ 1469 M_PREPEND(m0, 4, M_NOWAIT); 1470 1471 /* if allocation failed drop packet */ 1472 if (m0 == NULL) { 1473 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1); 1474 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 1475 return (ENOBUFS); 1476 } else 1477 *(u_int32_t *)m0->m_data = htonl(af); 1478 } else { 1479 #ifdef INET 1480 if (af != AF_INET) 1481 #endif 1482 { 1483 m_freem(m0); 1484 return (EAFNOSUPPORT); 1485 } 1486 } 1487 1488 error = (ifp->if_transmit)(ifp, m0); 1489 if (error) 1490 return (ENOBUFS); 1491 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 1492 return (0); 1493 } 1494 1495 /* 1496 * the cdevsw interface is now pretty minimal. 1497 */ 1498 static int 1499 tunioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, 1500 struct thread *td) 1501 { 1502 struct ifreq ifr, *ifrp; 1503 struct tuntap_softc *tp = dev->si_drv1; 1504 struct ifnet *ifp = TUN2IFP(tp); 1505 struct tuninfo *tunp; 1506 int error, iflags, ival; 1507 bool l2tun; 1508 1509 l2tun = (tp->tun_flags & TUN_L2) != 0; 1510 if (l2tun) { 1511 /* tap specific ioctls */ 1512 switch(cmd) { 1513 /* VMware/VMnet port ioctl's */ 1514 #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 1515 defined(COMPAT_FREEBSD4) 1516 case _IO('V', 0): 1517 ival = IOCPARM_IVAL(data); 1518 data = (caddr_t)&ival; 1519 /* FALLTHROUGH */ 1520 #endif 1521 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 1522 iflags = *(int *)data; 1523 iflags &= TUN_VMIO_FLAG_MASK; 1524 iflags &= ~IFF_CANTCHANGE; 1525 iflags |= IFF_UP; 1526 1527 TUN_LOCK(tp); 1528 ifp->if_flags = iflags | 1529 (ifp->if_flags & IFF_CANTCHANGE); 1530 TUN_UNLOCK(tp); 1531 1532 return (0); 1533 case SIOCGIFADDR: /* get MAC address of the remote side */ 1534 TUN_LOCK(tp); 1535 bcopy(&tp->tun_ether.octet, data, 1536 sizeof(tp->tun_ether.octet)); 1537 TUN_UNLOCK(tp); 1538 1539 return (0); 1540 case SIOCSIFADDR: /* set MAC address of the remote side */ 1541 TUN_LOCK(tp); 1542 bcopy(data, &tp->tun_ether.octet, 1543 sizeof(tp->tun_ether.octet)); 1544 TUN_UNLOCK(tp); 1545 1546 return (0); 1547 case TAPSVNETHDR: 1548 ival = *(int *)data; 1549 if (ival != 0 && 1550 ival != sizeof(struct virtio_net_hdr) && 1551 ival != sizeof(struct virtio_net_hdr_mrg_rxbuf)) { 1552 return (EINVAL); 1553 } 1554 TUN_LOCK(tp); 1555 tun_vnethdr_set(ifp, ival); 1556 TUN_UNLOCK(tp); 1557 1558 return (0); 1559 case TAPGVNETHDR: 1560 TUN_LOCK(tp); 1561 *(int *)data = tp->tun_vhdrlen; 1562 TUN_UNLOCK(tp); 1563 1564 return (0); 1565 } 1566 1567 /* Fall through to the common ioctls if unhandled */ 1568 } else { 1569 switch (cmd) { 1570 case TUNSLMODE: 1571 TUN_LOCK(tp); 1572 if (*(int *)data) { 1573 tp->tun_flags |= TUN_LMODE; 1574 tp->tun_flags &= ~TUN_IFHEAD; 1575 } else 1576 tp->tun_flags &= ~TUN_LMODE; 1577 TUN_UNLOCK(tp); 1578 1579 return (0); 1580 case TUNSIFHEAD: 1581 TUN_LOCK(tp); 1582 if (*(int *)data) { 1583 tp->tun_flags |= TUN_IFHEAD; 1584 tp->tun_flags &= ~TUN_LMODE; 1585 } else 1586 tp->tun_flags &= ~TUN_IFHEAD; 1587 TUN_UNLOCK(tp); 1588 1589 return (0); 1590 case TUNGIFHEAD: 1591 TUN_LOCK(tp); 1592 *(int *)data = (tp->tun_flags & TUN_IFHEAD) ? 1 : 0; 1593 TUN_UNLOCK(tp); 1594 1595 return (0); 1596 case TUNSIFMODE: 1597 /* deny this if UP */ 1598 if (TUN2IFP(tp)->if_flags & IFF_UP) 1599 return (EBUSY); 1600 1601 switch (*(int *)data & ~IFF_MULTICAST) { 1602 case IFF_POINTOPOINT: 1603 case IFF_BROADCAST: 1604 TUN_LOCK(tp); 1605 TUN2IFP(tp)->if_flags &= 1606 ~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST); 1607 TUN2IFP(tp)->if_flags |= *(int *)data; 1608 TUN_UNLOCK(tp); 1609 1610 break; 1611 default: 1612 return (EINVAL); 1613 } 1614 1615 return (0); 1616 case TUNSIFPID: 1617 TUN_LOCK(tp); 1618 tp->tun_pid = curthread->td_proc->p_pid; 1619 TUN_UNLOCK(tp); 1620 1621 return (0); 1622 } 1623 /* Fall through to the common ioctls if unhandled */ 1624 } 1625 1626 switch (cmd) { 1627 case TUNGIFNAME: 1628 ifrp = (struct ifreq *)data; 1629 strlcpy(ifrp->ifr_name, TUN2IFP(tp)->if_xname, IFNAMSIZ); 1630 1631 return (0); 1632 case TUNSIFINFO: 1633 tunp = (struct tuninfo *)data; 1634 if (TUN2IFP(tp)->if_type != tunp->type) 1635 return (EPROTOTYPE); 1636 TUN_LOCK(tp); 1637 if (TUN2IFP(tp)->if_mtu != tunp->mtu) { 1638 strlcpy(ifr.ifr_name, if_name(TUN2IFP(tp)), IFNAMSIZ); 1639 ifr.ifr_mtu = tunp->mtu; 1640 CURVNET_SET(TUN2IFP(tp)->if_vnet); 1641 error = ifhwioctl(SIOCSIFMTU, TUN2IFP(tp), 1642 (caddr_t)&ifr, td); 1643 CURVNET_RESTORE(); 1644 if (error) { 1645 TUN_UNLOCK(tp); 1646 return (error); 1647 } 1648 } 1649 TUN2IFP(tp)->if_baudrate = tunp->baudrate; 1650 TUN_UNLOCK(tp); 1651 break; 1652 case TUNGIFINFO: 1653 tunp = (struct tuninfo *)data; 1654 TUN_LOCK(tp); 1655 tunp->mtu = TUN2IFP(tp)->if_mtu; 1656 tunp->type = TUN2IFP(tp)->if_type; 1657 tunp->baudrate = TUN2IFP(tp)->if_baudrate; 1658 TUN_UNLOCK(tp); 1659 break; 1660 case TUNSDEBUG: 1661 tundebug = *(int *)data; 1662 break; 1663 case TUNGDEBUG: 1664 *(int *)data = tundebug; 1665 break; 1666 case FIONBIO: 1667 break; 1668 case FIOASYNC: 1669 TUN_LOCK(tp); 1670 if (*(int *)data) 1671 tp->tun_flags |= TUN_ASYNC; 1672 else 1673 tp->tun_flags &= ~TUN_ASYNC; 1674 TUN_UNLOCK(tp); 1675 break; 1676 case FIONREAD: 1677 if (!IFQ_IS_EMPTY(&TUN2IFP(tp)->if_snd)) { 1678 struct mbuf *mb; 1679 IFQ_LOCK(&TUN2IFP(tp)->if_snd); 1680 IFQ_POLL_NOLOCK(&TUN2IFP(tp)->if_snd, mb); 1681 for (*(int *)data = 0; mb != NULL; mb = mb->m_next) 1682 *(int *)data += mb->m_len; 1683 IFQ_UNLOCK(&TUN2IFP(tp)->if_snd); 1684 } else 1685 *(int *)data = 0; 1686 break; 1687 case FIOSETOWN: 1688 return (fsetown(*(int *)data, &tp->tun_sigio)); 1689 1690 case FIOGETOWN: 1691 *(int *)data = fgetown(&tp->tun_sigio); 1692 return (0); 1693 1694 /* This is deprecated, FIOSETOWN should be used instead. */ 1695 case TIOCSPGRP: 1696 return (fsetown(-(*(int *)data), &tp->tun_sigio)); 1697 1698 /* This is deprecated, FIOGETOWN should be used instead. */ 1699 case TIOCGPGRP: 1700 *(int *)data = -fgetown(&tp->tun_sigio); 1701 return (0); 1702 1703 default: 1704 return (ENOTTY); 1705 } 1706 return (0); 1707 } 1708 1709 /* 1710 * The cdevsw read interface - reads a packet at a time, or at 1711 * least as much of a packet as can be read. 1712 */ 1713 static int 1714 tunread(struct cdev *dev, struct uio *uio, int flag) 1715 { 1716 struct tuntap_softc *tp = dev->si_drv1; 1717 struct ifnet *ifp = TUN2IFP(tp); 1718 struct mbuf *m; 1719 size_t len; 1720 int error = 0; 1721 1722 TUNDEBUG (ifp, "read\n"); 1723 TUN_LOCK(tp); 1724 if ((tp->tun_flags & TUN_READY) != TUN_READY) { 1725 TUN_UNLOCK(tp); 1726 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 1727 return (EHOSTDOWN); 1728 } 1729 1730 tp->tun_flags &= ~TUN_RWAIT; 1731 1732 for (;;) { 1733 IFQ_DEQUEUE(&ifp->if_snd, m); 1734 if (m != NULL) 1735 break; 1736 if (flag & O_NONBLOCK) { 1737 TUN_UNLOCK(tp); 1738 return (EWOULDBLOCK); 1739 } 1740 tp->tun_flags |= TUN_RWAIT; 1741 error = mtx_sleep(tp, &tp->tun_mtx, PCATCH | (PZERO + 1), 1742 "tunread", 0); 1743 if (error != 0) { 1744 TUN_UNLOCK(tp); 1745 return (error); 1746 } 1747 } 1748 TUN_UNLOCK(tp); 1749 1750 len = min(tp->tun_vhdrlen, uio->uio_resid); 1751 if (len > 0) { 1752 struct virtio_net_hdr_mrg_rxbuf vhdr; 1753 1754 bzero(&vhdr, sizeof(vhdr)); 1755 if (m->m_pkthdr.csum_flags & TAP_ALL_OFFLOAD) { 1756 m = virtio_net_tx_offload(ifp, m, false, &vhdr.hdr); 1757 } 1758 1759 TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, " 1760 "gs %u, cs %u, co %u\n", vhdr.hdr.flags, 1761 vhdr.hdr.gso_type, vhdr.hdr.hdr_len, 1762 vhdr.hdr.gso_size, vhdr.hdr.csum_start, 1763 vhdr.hdr.csum_offset); 1764 error = uiomove(&vhdr, len, uio); 1765 } 1766 1767 while (m && uio->uio_resid > 0 && error == 0) { 1768 len = min(uio->uio_resid, m->m_len); 1769 if (len != 0) 1770 error = uiomove(mtod(m, void *), len, uio); 1771 m = m_free(m); 1772 } 1773 1774 if (m) { 1775 TUNDEBUG(ifp, "Dropping mbuf\n"); 1776 m_freem(m); 1777 } 1778 return (error); 1779 } 1780 1781 static int 1782 tunwrite_l2(struct tuntap_softc *tp, struct mbuf *m, 1783 struct virtio_net_hdr_mrg_rxbuf *vhdr) 1784 { 1785 struct epoch_tracker et; 1786 struct ether_header *eh; 1787 struct ifnet *ifp; 1788 1789 ifp = TUN2IFP(tp); 1790 1791 /* 1792 * Only pass a unicast frame to ether_input(), if it would 1793 * actually have been received by non-virtual hardware. 1794 */ 1795 if (m->m_len < sizeof(struct ether_header)) { 1796 m_freem(m); 1797 return (0); 1798 } 1799 1800 eh = mtod(m, struct ether_header *); 1801 1802 if ((ifp->if_flags & IFF_PROMISC) == 0 && 1803 !ETHER_IS_MULTICAST(eh->ether_dhost) && 1804 bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) { 1805 m_freem(m); 1806 return (0); 1807 } 1808 1809 if (vhdr != NULL) { 1810 if (virtio_net_rx_csum(m, &vhdr->hdr)) { 1811 m_freem(m); 1812 return (0); 1813 } 1814 } else { 1815 switch (ntohs(eh->ether_type)) { 1816 #ifdef INET 1817 case ETHERTYPE_IP: 1818 if (ifp->if_capenable & IFCAP_RXCSUM) { 1819 m->m_pkthdr.csum_flags |= 1820 CSUM_IP_CHECKED | CSUM_IP_VALID | 1821 CSUM_DATA_VALID | CSUM_SCTP_VALID | 1822 CSUM_PSEUDO_HDR; 1823 m->m_pkthdr.csum_data = 0xffff; 1824 } 1825 break; 1826 #endif 1827 #ifdef INET6 1828 case ETHERTYPE_IPV6: 1829 if (ifp->if_capenable & IFCAP_RXCSUM_IPV6) { 1830 m->m_pkthdr.csum_flags |= 1831 CSUM_DATA_VALID_IPV6 | CSUM_SCTP_VALID | 1832 CSUM_PSEUDO_HDR; 1833 m->m_pkthdr.csum_data = 0xffff; 1834 } 1835 break; 1836 #endif 1837 } 1838 } 1839 1840 /* Pass packet up to parent. */ 1841 CURVNET_SET(ifp->if_vnet); 1842 NET_EPOCH_ENTER(et); 1843 #if defined(INET) || defined(INET6) 1844 if (tp->tun_lro_ready && ifp->if_capenable & IFCAP_LRO && 1845 tcp_lro_rx(&tp->tun_lro, m, 0) == 0) 1846 tcp_lro_flush_all(&tp->tun_lro); 1847 else 1848 #endif 1849 (*ifp->if_input)(ifp, m); 1850 NET_EPOCH_EXIT(et); 1851 CURVNET_RESTORE(); 1852 /* ibytes are counted in parent */ 1853 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 1854 return (0); 1855 } 1856 1857 static int 1858 tunwrite_l3(struct tuntap_softc *tp, struct mbuf *m) 1859 { 1860 struct epoch_tracker et; 1861 struct ifnet *ifp; 1862 int family, isr; 1863 1864 ifp = TUN2IFP(tp); 1865 /* Could be unlocked read? */ 1866 TUN_LOCK(tp); 1867 if (tp->tun_flags & TUN_IFHEAD) { 1868 TUN_UNLOCK(tp); 1869 if (m->m_len < sizeof(family) && 1870 (m = m_pullup(m, sizeof(family))) == NULL) 1871 return (ENOBUFS); 1872 family = ntohl(*mtod(m, u_int32_t *)); 1873 m_adj(m, sizeof(family)); 1874 } else { 1875 TUN_UNLOCK(tp); 1876 family = AF_INET; 1877 } 1878 1879 BPF_MTAP2(ifp, &family, sizeof(family), m); 1880 1881 switch (family) { 1882 #ifdef INET 1883 case AF_INET: 1884 isr = NETISR_IP; 1885 break; 1886 #endif 1887 #ifdef INET6 1888 case AF_INET6: 1889 isr = NETISR_IPV6; 1890 break; 1891 #endif 1892 default: 1893 m_freem(m); 1894 return (EAFNOSUPPORT); 1895 } 1896 random_harvest_queue(m, sizeof(*m), RANDOM_NET_TUN); 1897 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 1898 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 1899 CURVNET_SET(ifp->if_vnet); 1900 M_SETFIB(m, ifp->if_fib); 1901 NET_EPOCH_ENTER(et); 1902 netisr_dispatch(isr, m); 1903 NET_EPOCH_EXIT(et); 1904 CURVNET_RESTORE(); 1905 return (0); 1906 } 1907 1908 /* 1909 * the cdevsw write interface - an atomic write is a packet - or else! 1910 */ 1911 static int 1912 tunwrite(struct cdev *dev, struct uio *uio, int flag) 1913 { 1914 struct virtio_net_hdr_mrg_rxbuf vhdr; 1915 struct tuntap_softc *tp; 1916 struct ifnet *ifp; 1917 struct mbuf *m; 1918 uint32_t mru; 1919 int align, vhdrlen, error; 1920 bool l2tun; 1921 1922 tp = dev->si_drv1; 1923 ifp = TUN2IFP(tp); 1924 TUNDEBUG(ifp, "tunwrite\n"); 1925 if ((ifp->if_flags & IFF_UP) != IFF_UP) 1926 /* ignore silently */ 1927 return (0); 1928 1929 if (uio->uio_resid == 0) 1930 return (0); 1931 1932 l2tun = (tp->tun_flags & TUN_L2) != 0; 1933 mru = l2tun ? TAPMRU : TUNMRU; 1934 vhdrlen = tp->tun_vhdrlen; 1935 align = 0; 1936 if (l2tun) { 1937 align = ETHER_ALIGN; 1938 mru += vhdrlen; 1939 } else if ((tp->tun_flags & TUN_IFHEAD) != 0) 1940 mru += sizeof(uint32_t); /* family */ 1941 if (uio->uio_resid < 0 || uio->uio_resid > mru) { 1942 TUNDEBUG(ifp, "len=%zd!\n", uio->uio_resid); 1943 return (EIO); 1944 } 1945 1946 if (vhdrlen > 0) { 1947 error = uiomove(&vhdr, vhdrlen, uio); 1948 if (error != 0) 1949 return (error); 1950 TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, " 1951 "gs %u, cs %u, co %u\n", vhdr.hdr.flags, 1952 vhdr.hdr.gso_type, vhdr.hdr.hdr_len, 1953 vhdr.hdr.gso_size, vhdr.hdr.csum_start, 1954 vhdr.hdr.csum_offset); 1955 } 1956 1957 if ((m = m_uiotombuf(uio, M_NOWAIT, 0, align, M_PKTHDR)) == NULL) { 1958 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 1959 return (ENOBUFS); 1960 } 1961 1962 m->m_pkthdr.rcvif = ifp; 1963 #ifdef MAC 1964 mac_ifnet_create_mbuf(ifp, m); 1965 #endif 1966 1967 if (l2tun) 1968 return (tunwrite_l2(tp, m, vhdrlen > 0 ? &vhdr : NULL)); 1969 1970 return (tunwrite_l3(tp, m)); 1971 } 1972 1973 /* 1974 * tunpoll - the poll interface, this is only useful on reads 1975 * really. The write detect always returns true, write never blocks 1976 * anyway, it either accepts the packet or drops it. 1977 */ 1978 static int 1979 tunpoll(struct cdev *dev, int events, struct thread *td) 1980 { 1981 struct tuntap_softc *tp = dev->si_drv1; 1982 struct ifnet *ifp = TUN2IFP(tp); 1983 int revents = 0; 1984 1985 TUNDEBUG(ifp, "tunpoll\n"); 1986 1987 if (events & (POLLIN | POLLRDNORM)) { 1988 IFQ_LOCK(&ifp->if_snd); 1989 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 1990 TUNDEBUG(ifp, "tunpoll q=%d\n", ifp->if_snd.ifq_len); 1991 revents |= events & (POLLIN | POLLRDNORM); 1992 } else { 1993 TUNDEBUG(ifp, "tunpoll waiting\n"); 1994 selrecord(td, &tp->tun_rsel); 1995 } 1996 IFQ_UNLOCK(&ifp->if_snd); 1997 } 1998 revents |= events & (POLLOUT | POLLWRNORM); 1999 2000 return (revents); 2001 } 2002 2003 /* 2004 * tunkqfilter - support for the kevent() system call. 2005 */ 2006 static int 2007 tunkqfilter(struct cdev *dev, struct knote *kn) 2008 { 2009 struct tuntap_softc *tp = dev->si_drv1; 2010 struct ifnet *ifp = TUN2IFP(tp); 2011 2012 switch(kn->kn_filter) { 2013 case EVFILT_READ: 2014 TUNDEBUG(ifp, "%s kqfilter: EVFILT_READ, minor = %#x\n", 2015 ifp->if_xname, dev2unit(dev)); 2016 kn->kn_fop = &tun_read_filterops; 2017 break; 2018 2019 case EVFILT_WRITE: 2020 TUNDEBUG(ifp, "%s kqfilter: EVFILT_WRITE, minor = %#x\n", 2021 ifp->if_xname, dev2unit(dev)); 2022 kn->kn_fop = &tun_write_filterops; 2023 break; 2024 2025 default: 2026 TUNDEBUG(ifp, "%s kqfilter: invalid filter, minor = %#x\n", 2027 ifp->if_xname, dev2unit(dev)); 2028 return(EINVAL); 2029 } 2030 2031 kn->kn_hook = tp; 2032 knlist_add(&tp->tun_rsel.si_note, kn, 0); 2033 2034 return (0); 2035 } 2036 2037 /* 2038 * Return true of there is data in the interface queue. 2039 */ 2040 static int 2041 tunkqread(struct knote *kn, long hint) 2042 { 2043 int ret; 2044 struct tuntap_softc *tp = kn->kn_hook; 2045 struct cdev *dev = tp->tun_dev; 2046 struct ifnet *ifp = TUN2IFP(tp); 2047 2048 if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) { 2049 TUNDEBUG(ifp, 2050 "%s have data in the queue. Len = %d, minor = %#x\n", 2051 ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev)); 2052 ret = 1; 2053 } else { 2054 TUNDEBUG(ifp, 2055 "%s waiting for data, minor = %#x\n", ifp->if_xname, 2056 dev2unit(dev)); 2057 ret = 0; 2058 } 2059 2060 return (ret); 2061 } 2062 2063 /* 2064 * Always can write, always return MTU in kn->data. 2065 */ 2066 static int 2067 tunkqwrite(struct knote *kn, long hint) 2068 { 2069 struct tuntap_softc *tp = kn->kn_hook; 2070 struct ifnet *ifp = TUN2IFP(tp); 2071 2072 kn->kn_data = ifp->if_mtu; 2073 2074 return (1); 2075 } 2076 2077 static void 2078 tunkqdetach(struct knote *kn) 2079 { 2080 struct tuntap_softc *tp = kn->kn_hook; 2081 2082 knlist_remove(&tp->tun_rsel.si_note, kn, 0); 2083 } 2084