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 #include <sys/osd.h> 78 79 #include <net/ethernet.h> 80 #include <net/if.h> 81 #include <net/if_var.h> 82 #include <net/if_clone.h> 83 #include <net/if_dl.h> 84 #include <net/if_media.h> 85 #include <net/if_private.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 <netinet/tcp_lro.h> 102 #include <net/bpf.h> 103 #include <net/if_tap.h> 104 #include <net/if_tun.h> 105 106 #include <dev/virtio/network/virtio_net.h> 107 108 #include <sys/queue.h> 109 #include <sys/condvar.h> 110 #include <security/mac/mac_framework.h> 111 112 struct tuntap_driver; 113 114 /* 115 * tun_list is protected by global tunmtx. Other mutable fields are 116 * protected by tun->tun_mtx, or by their owning subsystem. tun_dev is 117 * static for the duration of a tunnel interface. 118 */ 119 struct tuntap_softc { 120 TAILQ_ENTRY(tuntap_softc) tun_list; 121 struct cdev *tun_alias; 122 struct cdev *tun_dev; 123 u_short tun_flags; /* misc flags */ 124 #define TUN_OPEN 0x0001 125 #define TUN_INITED 0x0002 126 #define TUN_UNUSED1 0x0008 127 #define TUN_UNUSED2 0x0010 128 #define TUN_LMODE 0x0020 129 #define TUN_RWAIT 0x0040 130 #define TUN_ASYNC 0x0080 131 #define TUN_IFHEAD 0x0100 132 #define TUN_DYING 0x0200 133 #define TUN_L2 0x0400 134 #define TUN_VMNET 0x0800 135 136 #define TUN_DRIVER_IDENT_MASK (TUN_L2 | TUN_VMNET) 137 #define TUN_READY (TUN_OPEN | TUN_INITED) 138 139 pid_t tun_pid; /* owning pid */ 140 struct ifnet *tun_ifp; /* the interface */ 141 struct sigio *tun_sigio; /* async I/O info */ 142 struct tuntap_driver *tun_drv; /* appropriate driver */ 143 struct selinfo tun_rsel; /* read select */ 144 struct mtx tun_mtx; /* softc field mutex */ 145 struct cv tun_cv; /* for ref'd dev destroy */ 146 struct ether_addr tun_ether; /* remote address */ 147 int tun_busy; /* busy count */ 148 int tun_vhdrlen; /* virtio-net header length */ 149 struct lro_ctrl tun_lro; /* for TCP LRO */ 150 bool tun_lro_ready; /* TCP LRO initialized */ 151 }; 152 #define TUN2IFP(sc) ((sc)->tun_ifp) 153 154 #define TUNDEBUG if (tundebug) if_printf 155 156 #define TUN_LOCK(tp) mtx_lock(&(tp)->tun_mtx) 157 #define TUN_UNLOCK(tp) mtx_unlock(&(tp)->tun_mtx) 158 #define TUN_LOCK_ASSERT(tp) mtx_assert(&(tp)->tun_mtx, MA_OWNED); 159 160 #define TUN_VMIO_FLAG_MASK 0x0fff 161 162 /* 163 * Interface capabilities of a tap device that supports the virtio-net 164 * header. 165 */ 166 #define TAP_VNET_HDR_CAPS (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6 \ 167 | IFCAP_VLAN_HWCSUM \ 168 | IFCAP_TSO | IFCAP_LRO \ 169 | IFCAP_VLAN_HWTSO) 170 171 #define TAP_ALL_OFFLOAD (CSUM_TSO | CSUM_TCP | CSUM_UDP |\ 172 CSUM_TCP_IPV6 | CSUM_UDP_IPV6) 173 174 /* 175 * All mutable global variables in if_tun are locked using tunmtx, with 176 * the exception of tundebug, which is used unlocked, and the drivers' *clones, 177 * which are static after setup. 178 */ 179 static struct mtx tunmtx; 180 static eventhandler_tag arrival_tag; 181 static eventhandler_tag clone_tag; 182 static int tuntap_osd_jail_slot; 183 static const char tunname[] = "tun"; 184 static const char tapname[] = "tap"; 185 static const char vmnetname[] = "vmnet"; 186 static MALLOC_DEFINE(M_TUN, tunname, "Tunnel Interface"); 187 static int tundebug = 0; 188 static int tundclone = 1; 189 static int tap_allow_uopen = 0; /* allow user devfs cloning */ 190 static int tapuponopen = 0; /* IFF_UP on open() */ 191 static int tapdclone = 1; /* enable devfs cloning */ 192 193 static TAILQ_HEAD(,tuntap_softc) tunhead = TAILQ_HEAD_INITIALIZER(tunhead); 194 SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, ""); 195 196 static struct sx tun_ioctl_sx; 197 SX_SYSINIT(tun_ioctl_sx, &tun_ioctl_sx, "tun_ioctl"); 198 199 SYSCTL_DECL(_net_link); 200 /* tun */ 201 static SYSCTL_NODE(_net_link, OID_AUTO, tun, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 202 "IP tunnel software network interface"); 203 SYSCTL_INT(_net_link_tun, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tundclone, 0, 204 "Enable legacy devfs interface creation"); 205 206 /* tap */ 207 static SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 208 "Ethernet tunnel software network interface"); 209 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tap_allow_uopen, 0, 210 "Enable legacy devfs interface creation for all users"); 211 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0, 212 "Bring interface up when /dev/tap is opened"); 213 SYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tapdclone, 0, 214 "Enable legacy devfs interface creation"); 215 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tundebug, 0, ""); 216 217 static int tun_create_device(struct tuntap_driver *drv, int unit, 218 struct ucred *cr, struct cdev **dev, const char *name); 219 static int tun_busy_locked(struct tuntap_softc *tp); 220 static void tun_unbusy_locked(struct tuntap_softc *tp); 221 static int tun_busy(struct tuntap_softc *tp); 222 static void tun_unbusy(struct tuntap_softc *tp); 223 224 static int tuntap_name2info(const char *name, int *unit, int *flags); 225 static void tunclone(void *arg, struct ucred *cred, char *name, 226 int namelen, struct cdev **dev); 227 static void tuncreate(struct cdev *dev); 228 static void tundtor(void *data); 229 static void tunrename(void *arg, struct ifnet *ifp); 230 static int tunifioctl(struct ifnet *, u_long, caddr_t); 231 static void tuninit(struct ifnet *); 232 static void tunifinit(void *xtp); 233 static int tuntapmodevent(module_t, int, void *); 234 static int tunoutput(struct ifnet *, struct mbuf *, 235 const struct sockaddr *, struct route *ro); 236 static void tunstart(struct ifnet *); 237 static void tunstart_l2(struct ifnet *); 238 239 static int tun_clone_match(struct if_clone *ifc, const char *name); 240 static int tap_clone_match(struct if_clone *ifc, const char *name); 241 static int vmnet_clone_match(struct if_clone *ifc, const char *name); 242 static int tun_clone_create(struct if_clone *, char *, size_t, 243 struct ifc_data *, struct ifnet **); 244 static int tun_clone_destroy(struct if_clone *, struct ifnet *, uint32_t); 245 static void tun_vnethdr_set(struct ifnet *ifp, int vhdrlen); 246 247 static d_open_t tunopen; 248 static d_read_t tunread; 249 static d_write_t tunwrite; 250 static d_ioctl_t tunioctl; 251 static d_poll_t tunpoll; 252 static d_kqfilter_t tunkqfilter; 253 254 static int tunkqread(struct knote *, long); 255 static int tunkqwrite(struct knote *, long); 256 static void tunkqdetach(struct knote *); 257 258 static const struct filterops tun_read_filterops = { 259 .f_isfd = 1, 260 .f_attach = NULL, 261 .f_detach = tunkqdetach, 262 .f_event = tunkqread, 263 }; 264 265 static const struct filterops tun_write_filterops = { 266 .f_isfd = 1, 267 .f_attach = NULL, 268 .f_detach = tunkqdetach, 269 .f_event = tunkqwrite, 270 }; 271 272 static struct tuntap_driver { 273 struct cdevsw cdevsw; 274 int ident_flags; 275 struct unrhdr *unrhdr; 276 struct clonedevs *clones; 277 ifc_match_f *clone_match_fn; 278 ifc_create_f *clone_create_fn; 279 ifc_destroy_f *clone_destroy_fn; 280 } tuntap_drivers[] = { 281 { 282 .ident_flags = 0, 283 .cdevsw = { 284 .d_version = D_VERSION, 285 .d_flags = D_NEEDMINOR, 286 .d_open = tunopen, 287 .d_read = tunread, 288 .d_write = tunwrite, 289 .d_ioctl = tunioctl, 290 .d_poll = tunpoll, 291 .d_kqfilter = tunkqfilter, 292 .d_name = tunname, 293 }, 294 .clone_match_fn = tun_clone_match, 295 .clone_create_fn = tun_clone_create, 296 .clone_destroy_fn = tun_clone_destroy, 297 }, 298 { 299 .ident_flags = TUN_L2, 300 .cdevsw = { 301 .d_version = D_VERSION, 302 .d_flags = D_NEEDMINOR, 303 .d_open = tunopen, 304 .d_read = tunread, 305 .d_write = tunwrite, 306 .d_ioctl = tunioctl, 307 .d_poll = tunpoll, 308 .d_kqfilter = tunkqfilter, 309 .d_name = tapname, 310 }, 311 .clone_match_fn = tap_clone_match, 312 .clone_create_fn = tun_clone_create, 313 .clone_destroy_fn = tun_clone_destroy, 314 }, 315 { 316 .ident_flags = TUN_L2 | TUN_VMNET, 317 .cdevsw = { 318 .d_version = D_VERSION, 319 .d_flags = D_NEEDMINOR, 320 .d_open = tunopen, 321 .d_read = tunread, 322 .d_write = tunwrite, 323 .d_ioctl = tunioctl, 324 .d_poll = tunpoll, 325 .d_kqfilter = tunkqfilter, 326 .d_name = vmnetname, 327 }, 328 .clone_match_fn = vmnet_clone_match, 329 .clone_create_fn = tun_clone_create, 330 .clone_destroy_fn = tun_clone_destroy, 331 }, 332 }; 333 #define NDRV nitems(tuntap_drivers) 334 335 VNET_DEFINE_STATIC(struct if_clone *, tuntap_driver_cloners[NDRV]); 336 #define V_tuntap_driver_cloners VNET(tuntap_driver_cloners) 337 338 /* 339 * Mechanism for marking a tunnel device as busy so that we can safely do some 340 * orthogonal operations (such as operations on devices) without racing against 341 * tun_destroy. tun_destroy will wait on the condvar if we're at all busy or 342 * open, to be woken up when the condition is alleviated. 343 */ 344 static int 345 tun_busy_locked(struct tuntap_softc *tp) 346 { 347 348 TUN_LOCK_ASSERT(tp); 349 if ((tp->tun_flags & TUN_DYING) != 0) { 350 /* 351 * Perhaps unintuitive, but the device is busy going away. 352 * Other interpretations of EBUSY from tun_busy make little 353 * sense, since making a busy device even more busy doesn't 354 * sound like a problem. 355 */ 356 return (EBUSY); 357 } 358 359 ++tp->tun_busy; 360 return (0); 361 } 362 363 static void 364 tun_unbusy_locked(struct tuntap_softc *tp) 365 { 366 367 TUN_LOCK_ASSERT(tp); 368 KASSERT(tp->tun_busy != 0, ("tun_unbusy: called for non-busy tunnel")); 369 370 --tp->tun_busy; 371 /* Wake up anything that may be waiting on our busy tunnel. */ 372 if (tp->tun_busy == 0) 373 cv_broadcast(&tp->tun_cv); 374 } 375 376 static int 377 tun_busy(struct tuntap_softc *tp) 378 { 379 int ret; 380 381 TUN_LOCK(tp); 382 ret = tun_busy_locked(tp); 383 TUN_UNLOCK(tp); 384 return (ret); 385 } 386 387 static void 388 tun_unbusy(struct tuntap_softc *tp) 389 { 390 391 TUN_LOCK(tp); 392 tun_unbusy_locked(tp); 393 TUN_UNLOCK(tp); 394 } 395 396 /* 397 * Sets unit and/or flags given the device name. Must be called with correct 398 * vnet context. 399 */ 400 static int 401 tuntap_name2info(const char *name, int *outunit, int *outflags) 402 { 403 struct tuntap_driver *drv; 404 char *dname; 405 int flags, unit; 406 bool found; 407 408 if (name == NULL) 409 return (EINVAL); 410 411 /* 412 * Needed for dev_stdclone, but dev_stdclone will not modify, it just 413 * wants to be able to pass back a char * through the second param. We 414 * will always set that as NULL here, so we'll fake it. 415 */ 416 dname = __DECONST(char *, name); 417 found = false; 418 419 for (u_int i = 0; i < NDRV; i++) { 420 drv = &tuntap_drivers[i]; 421 422 if (strcmp(name, drv->cdevsw.d_name) == 0) { 423 found = true; 424 unit = -1; 425 flags = drv->ident_flags; 426 break; 427 } 428 429 if (dev_stdclone(dname, NULL, drv->cdevsw.d_name, &unit) == 1) { 430 found = true; 431 flags = drv->ident_flags; 432 break; 433 } 434 } 435 436 if (!found) 437 return (ENXIO); 438 439 if (outunit != NULL) 440 *outunit = unit; 441 if (outflags != NULL) 442 *outflags = flags; 443 return (0); 444 } 445 446 /* 447 * Get driver information from a set of flags specified. Masks the identifying 448 * part of the flags and compares it against all of the available 449 * tuntap_drivers. 450 */ 451 static struct tuntap_driver * 452 tuntap_driver_from_flags(int tun_flags) 453 { 454 455 for (u_int i = 0; i < NDRV; i++) 456 if ((tun_flags & TUN_DRIVER_IDENT_MASK) == 457 tuntap_drivers[i].ident_flags) 458 return (&tuntap_drivers[i]); 459 460 return (NULL); 461 } 462 463 static int 464 tun_clone_match(struct if_clone *ifc, const char *name) 465 { 466 int tunflags; 467 468 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 469 if ((tunflags & TUN_L2) == 0) 470 return (1); 471 } 472 473 return (0); 474 } 475 476 static int 477 tap_clone_match(struct if_clone *ifc, const char *name) 478 { 479 int tunflags; 480 481 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 482 if ((tunflags & (TUN_L2 | TUN_VMNET)) == TUN_L2) 483 return (1); 484 } 485 486 return (0); 487 } 488 489 static int 490 vmnet_clone_match(struct if_clone *ifc, const char *name) 491 { 492 int tunflags; 493 494 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 495 if ((tunflags & TUN_VMNET) != 0) 496 return (1); 497 } 498 499 return (0); 500 } 501 502 /* 503 * Create a clone via the ifnet cloning mechanism. Note that this is invoked 504 * indirectly by tunclone() below. 505 */ 506 static int 507 tun_clone_create(struct if_clone *ifc, char *name, size_t len, 508 struct ifc_data *ifd, struct ifnet **ifpp) 509 { 510 struct tuntap_driver *drv; 511 struct cdev *dev; 512 int err, i, tunflags, unit; 513 514 tunflags = 0; 515 /* The name here tells us exactly what we're creating */ 516 err = tuntap_name2info(name, &unit, &tunflags); 517 if (err != 0) 518 return (err); 519 520 drv = tuntap_driver_from_flags(tunflags); 521 if (drv == NULL) 522 return (ENXIO); 523 524 if (unit != -1) { 525 /* If this unit number is still available that's okay. */ 526 if (alloc_unr_specific(drv->unrhdr, unit) == -1) 527 return (EEXIST); 528 } else { 529 unit = alloc_unr(drv->unrhdr); 530 } 531 532 snprintf(name, IFNAMSIZ, "%s%d", drv->cdevsw.d_name, unit); 533 534 /* find any existing device, or allocate new unit number */ 535 dev = NULL; 536 i = clone_create(&drv->clones, &drv->cdevsw, &unit, &dev, 0); 537 /* No preexisting struct cdev *, create one */ 538 if (i != 0) 539 i = tun_create_device(drv, unit, NULL, &dev, name); 540 if (i == 0) { 541 struct tuntap_softc *tp; 542 543 tuncreate(dev); 544 tp = dev->si_drv1; 545 *ifpp = tp->tun_ifp; 546 } 547 548 return (i); 549 } 550 551 /* 552 * Create a clone via devfs access. 553 */ 554 static void 555 tunclone(void *arg, struct ucred *cred, char *name, int namelen, 556 struct cdev **dev) 557 { 558 char devname[SPECNAMELEN + 1]; 559 struct tuntap_driver *drv; 560 int append_unit, i, u, tunflags; 561 bool mayclone; 562 563 if (*dev != NULL) 564 return; 565 566 tunflags = 0; 567 CURVNET_SET(CRED_TO_VNET(cred)); 568 if (tuntap_name2info(name, &u, &tunflags) != 0) 569 goto out; /* Not recognized */ 570 571 if (u != -1 && u > IF_MAXUNIT) 572 goto out; /* Unit number too high */ 573 574 mayclone = priv_check_cred(cred, PRIV_NET_IFCREATE) == 0; 575 if ((tunflags & TUN_L2) != 0) { 576 /* tap/vmnet allow user open with a sysctl */ 577 mayclone = (mayclone || tap_allow_uopen) && tapdclone; 578 } else { 579 mayclone = mayclone && tundclone; 580 } 581 582 /* 583 * If tun cloning is enabled, only the superuser can create an 584 * interface. 585 */ 586 if (!mayclone) 587 goto out; 588 589 if (u == -1) 590 append_unit = 1; 591 else 592 append_unit = 0; 593 594 drv = tuntap_driver_from_flags(tunflags); 595 if (drv == NULL) 596 goto out; 597 598 /* find any existing device, or allocate new unit number */ 599 i = clone_create(&drv->clones, &drv->cdevsw, &u, dev, 0); 600 if (i) { 601 if (append_unit) { 602 namelen = snprintf(devname, sizeof(devname), "%s%d", 603 name, u); 604 name = devname; 605 } 606 607 i = tun_create_device(drv, u, cred, dev, name); 608 } else { 609 /* Consumed by the dev_clone invoker. */ 610 dev_ref(*dev); 611 } 612 if (i == 0) 613 if_clone_create(name, namelen, NULL); 614 out: 615 CURVNET_RESTORE(); 616 } 617 618 static void 619 tun_destroy(struct tuntap_softc *tp) 620 { 621 622 TUN_LOCK(tp); 623 tp->tun_flags |= TUN_DYING; 624 if (tp->tun_busy != 0) 625 cv_wait_unlock(&tp->tun_cv, &tp->tun_mtx); 626 else 627 TUN_UNLOCK(tp); 628 629 CURVNET_SET(TUN2IFP(tp)->if_vnet); 630 631 /* destroy_dev will take care of any alias. */ 632 destroy_dev(tp->tun_dev); 633 seldrain(&tp->tun_rsel); 634 knlist_clear(&tp->tun_rsel.si_note, 0); 635 knlist_destroy(&tp->tun_rsel.si_note); 636 if ((tp->tun_flags & TUN_L2) != 0) { 637 ether_ifdetach(TUN2IFP(tp)); 638 } else { 639 bpfdetach(TUN2IFP(tp)); 640 if_detach(TUN2IFP(tp)); 641 } 642 sx_xlock(&tun_ioctl_sx); 643 TUN2IFP(tp)->if_softc = NULL; 644 sx_xunlock(&tun_ioctl_sx); 645 free_unr(tp->tun_drv->unrhdr, TUN2IFP(tp)->if_dunit); 646 if_free(TUN2IFP(tp)); 647 mtx_destroy(&tp->tun_mtx); 648 cv_destroy(&tp->tun_cv); 649 free(tp, M_TUN); 650 CURVNET_RESTORE(); 651 } 652 653 static int 654 tun_clone_destroy(struct if_clone *ifc __unused, struct ifnet *ifp, uint32_t flags) 655 { 656 struct tuntap_softc *tp = ifp->if_softc; 657 658 mtx_lock(&tunmtx); 659 TAILQ_REMOVE(&tunhead, tp, tun_list); 660 mtx_unlock(&tunmtx); 661 tun_destroy(tp); 662 663 return (0); 664 } 665 666 static void 667 vnet_tun_init(const void *unused __unused) 668 { 669 670 for (u_int i = 0; i < NDRV; ++i) { 671 struct if_clone_addreq req = { 672 .match_f = tuntap_drivers[i].clone_match_fn, 673 .create_f = tuntap_drivers[i].clone_create_fn, 674 .destroy_f = tuntap_drivers[i].clone_destroy_fn, 675 }; 676 V_tuntap_driver_cloners[i] = 677 ifc_attach_cloner(tuntap_drivers[i].cdevsw.d_name, &req); 678 }; 679 } 680 VNET_SYSINIT(vnet_tun_init, SI_SUB_PROTO_IF, SI_ORDER_ANY, 681 vnet_tun_init, NULL); 682 683 static void 684 tun_uninit(const void *unused __unused) 685 { 686 struct tuntap_driver *drv; 687 struct tuntap_softc *tp; 688 int i; 689 690 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, arrival_tag); 691 EVENTHANDLER_DEREGISTER(dev_clone, clone_tag); 692 693 CURVNET_SET(vnet0); 694 for (u_int i = 0; i < NDRV; i++) { 695 if_clone_detach(V_tuntap_driver_cloners[i]); 696 V_tuntap_driver_cloners[i] = NULL; 697 } 698 CURVNET_RESTORE(); 699 700 if (tuntap_osd_jail_slot != 0) 701 osd_jail_deregister(tuntap_osd_jail_slot); 702 703 mtx_lock(&tunmtx); 704 while ((tp = TAILQ_FIRST(&tunhead)) != NULL) { 705 TAILQ_REMOVE(&tunhead, tp, tun_list); 706 mtx_unlock(&tunmtx); 707 tun_destroy(tp); 708 mtx_lock(&tunmtx); 709 } 710 mtx_unlock(&tunmtx); 711 for (i = 0; i < nitems(tuntap_drivers); ++i) { 712 drv = &tuntap_drivers[i]; 713 delete_unrhdr(drv->unrhdr); 714 clone_cleanup(&drv->clones); 715 } 716 mtx_destroy(&tunmtx); 717 } 718 SYSUNINIT(tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY, tun_uninit, NULL); 719 720 static struct tuntap_driver * 721 tuntap_driver_from_ifnet(const struct ifnet *ifp) 722 { 723 struct tuntap_driver *drv; 724 int i; 725 726 if (ifp == NULL) 727 return (NULL); 728 729 for (i = 0; i < nitems(tuntap_drivers); ++i) { 730 drv = &tuntap_drivers[i]; 731 if (strcmp(ifp->if_dname, drv->cdevsw.d_name) == 0) 732 return (drv); 733 } 734 735 return (NULL); 736 } 737 738 /* 739 * Remove devices that were created by devfs cloning, as they hold references 740 * which prevent the prison from collapsing, in which state VNET sysuninits will 741 * not be invoked. 742 */ 743 static int 744 tuntap_prison_remove(void *obj, void *data __unused) 745 { 746 #ifdef VIMAGE 747 struct prison *pr; 748 749 pr = obj; 750 if (prison_owns_vnet(pr)) { 751 CURVNET_SET(pr->pr_vnet); 752 for (u_int i = 0; i < NDRV; i++) { 753 if_clone_detach(V_tuntap_driver_cloners[i]); 754 V_tuntap_driver_cloners[i] = NULL; 755 } 756 CURVNET_RESTORE(); 757 } 758 #endif 759 return (0); 760 } 761 762 static int 763 tuntapmodevent(module_t mod, int type, void *data) 764 { 765 struct tuntap_driver *drv; 766 int i; 767 768 switch (type) { 769 case MOD_LOAD: 770 mtx_init(&tunmtx, "tunmtx", NULL, MTX_DEF); 771 for (i = 0; i < nitems(tuntap_drivers); ++i) { 772 drv = &tuntap_drivers[i]; 773 clone_setup(&drv->clones); 774 drv->unrhdr = new_unrhdr(0, IF_MAXUNIT, &tunmtx); 775 } 776 osd_method_t methods[PR_MAXMETHOD] = { 777 [PR_METHOD_REMOVE] = tuntap_prison_remove, 778 }; 779 tuntap_osd_jail_slot = osd_jail_register(NULL, methods); 780 arrival_tag = EVENTHANDLER_REGISTER(ifnet_arrival_event, 781 tunrename, 0, 1000); 782 if (arrival_tag == NULL) 783 return (ENOMEM); 784 clone_tag = EVENTHANDLER_REGISTER(dev_clone, tunclone, 0, 1000); 785 if (clone_tag == NULL) 786 return (ENOMEM); 787 break; 788 case MOD_UNLOAD: 789 /* See tun_uninit(). */ 790 break; 791 default: 792 return EOPNOTSUPP; 793 } 794 return 0; 795 } 796 797 static moduledata_t tuntap_mod = { 798 "if_tuntap", 799 tuntapmodevent, 800 0 801 }; 802 803 /* We'll only ever have these two, so no need for a macro. */ 804 static moduledata_t tun_mod = { "if_tun", NULL, 0 }; 805 static moduledata_t tap_mod = { "if_tap", NULL, 0 }; 806 807 DECLARE_MODULE(if_tuntap, tuntap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 808 MODULE_VERSION(if_tuntap, 1); 809 DECLARE_MODULE(if_tun, tun_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 810 MODULE_VERSION(if_tun, 1); 811 DECLARE_MODULE(if_tap, tap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 812 MODULE_VERSION(if_tap, 1); 813 814 static int 815 tun_create_device(struct tuntap_driver *drv, int unit, struct ucred *cr, 816 struct cdev **dev, const char *name) 817 { 818 struct make_dev_args args; 819 struct tuntap_softc *tp; 820 int error; 821 822 tp = malloc(sizeof(*tp), M_TUN, M_WAITOK | M_ZERO); 823 mtx_init(&tp->tun_mtx, "tun_mtx", NULL, MTX_DEF); 824 cv_init(&tp->tun_cv, "tun_condvar"); 825 tp->tun_flags = drv->ident_flags; 826 tp->tun_drv = drv; 827 828 make_dev_args_init(&args); 829 if (cr != NULL) 830 args.mda_flags = MAKEDEV_REF | MAKEDEV_CHECKNAME; 831 args.mda_devsw = &drv->cdevsw; 832 args.mda_cr = cr; 833 args.mda_uid = UID_UUCP; 834 args.mda_gid = GID_DIALER; 835 args.mda_mode = 0600; 836 args.mda_unit = unit; 837 args.mda_si_drv1 = tp; 838 error = make_dev_s(&args, dev, "%s", name); 839 if (error != 0) { 840 mtx_destroy(&tp->tun_mtx); 841 cv_destroy(&tp->tun_cv); 842 free(tp, M_TUN); 843 return (error); 844 } 845 846 KASSERT((*dev)->si_drv1 != NULL, 847 ("Failed to set si_drv1 at %s creation", name)); 848 tp->tun_dev = *dev; 849 knlist_init_mtx(&tp->tun_rsel.si_note, &tp->tun_mtx); 850 mtx_lock(&tunmtx); 851 TAILQ_INSERT_TAIL(&tunhead, tp, tun_list); 852 mtx_unlock(&tunmtx); 853 return (0); 854 } 855 856 static void 857 tunstart(struct ifnet *ifp) 858 { 859 struct tuntap_softc *tp = ifp->if_softc; 860 struct mbuf *m; 861 862 TUNDEBUG(ifp, "starting\n"); 863 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 864 IFQ_LOCK(&ifp->if_snd); 865 IFQ_POLL_NOLOCK(&ifp->if_snd, m); 866 if (m == NULL) { 867 IFQ_UNLOCK(&ifp->if_snd); 868 return; 869 } 870 IFQ_UNLOCK(&ifp->if_snd); 871 } 872 873 TUN_LOCK(tp); 874 if (tp->tun_flags & TUN_RWAIT) { 875 tp->tun_flags &= ~TUN_RWAIT; 876 wakeup(tp); 877 } 878 selwakeuppri(&tp->tun_rsel, PZERO); 879 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 880 if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio) { 881 TUN_UNLOCK(tp); 882 pgsigio(&tp->tun_sigio, SIGIO, 0); 883 } else 884 TUN_UNLOCK(tp); 885 } 886 887 /* 888 * tunstart_l2 889 * 890 * queue packets from higher level ready to put out 891 */ 892 static void 893 tunstart_l2(struct ifnet *ifp) 894 { 895 struct tuntap_softc *tp = ifp->if_softc; 896 897 TUNDEBUG(ifp, "starting\n"); 898 899 /* 900 * do not junk pending output if we are in VMnet mode. 901 * XXX: can this do any harm because of queue overflow? 902 */ 903 904 TUN_LOCK(tp); 905 if (((tp->tun_flags & TUN_VMNET) == 0) && 906 ((tp->tun_flags & TUN_READY) != TUN_READY)) { 907 struct mbuf *m; 908 909 /* Unlocked read. */ 910 TUNDEBUG(ifp, "not ready, tun_flags = 0x%x\n", tp->tun_flags); 911 912 for (;;) { 913 IF_DEQUEUE(&ifp->if_snd, m); 914 if (m != NULL) { 915 m_freem(m); 916 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 917 } else 918 break; 919 } 920 TUN_UNLOCK(tp); 921 922 return; 923 } 924 925 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 926 927 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 928 if (tp->tun_flags & TUN_RWAIT) { 929 tp->tun_flags &= ~TUN_RWAIT; 930 wakeup(tp); 931 } 932 933 if ((tp->tun_flags & TUN_ASYNC) && (tp->tun_sigio != NULL)) { 934 TUN_UNLOCK(tp); 935 pgsigio(&tp->tun_sigio, SIGIO, 0); 936 TUN_LOCK(tp); 937 } 938 939 selwakeuppri(&tp->tun_rsel, PZERO); 940 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 941 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); /* obytes are counted in ether_output */ 942 } 943 944 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 945 TUN_UNLOCK(tp); 946 } /* tunstart_l2 */ 947 948 static int 949 tap_transmit(struct ifnet *ifp, struct mbuf *m) 950 { 951 int error; 952 953 BPF_MTAP(ifp, m); 954 IFQ_HANDOFF(ifp, m, error); 955 return (error); 956 } 957 958 static void 959 tuncreate(struct cdev *dev) 960 { 961 struct tuntap_driver *drv; 962 struct tuntap_softc *tp; 963 struct ifnet *ifp; 964 struct ether_addr eaddr; 965 int iflags; 966 u_char type; 967 968 tp = dev->si_drv1; 969 KASSERT(tp != NULL, 970 ("si_drv1 should have been initialized at creation")); 971 972 drv = tp->tun_drv; 973 iflags = IFF_MULTICAST; 974 if ((tp->tun_flags & TUN_L2) != 0) { 975 type = IFT_ETHER; 976 iflags |= IFF_BROADCAST | IFF_SIMPLEX; 977 } else { 978 type = IFT_PPP; 979 iflags |= IFF_POINTOPOINT; 980 } 981 ifp = tp->tun_ifp = if_alloc(type); 982 ifp->if_softc = tp; 983 if_initname(ifp, drv->cdevsw.d_name, dev2unit(dev)); 984 ifp->if_ioctl = tunifioctl; 985 ifp->if_flags = iflags; 986 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 987 ifp->if_capabilities |= IFCAP_LINKSTATE | IFCAP_MEXTPG; 988 if ((tp->tun_flags & TUN_L2) != 0) 989 ifp->if_capabilities |= 990 IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO; 991 ifp->if_capenable |= IFCAP_LINKSTATE | IFCAP_MEXTPG; 992 993 if ((tp->tun_flags & TUN_L2) != 0) { 994 ifp->if_init = tunifinit; 995 ifp->if_start = tunstart_l2; 996 ifp->if_transmit = tap_transmit; 997 ifp->if_qflush = if_qflush; 998 999 ether_gen_addr(ifp, &eaddr); 1000 ether_ifattach(ifp, eaddr.octet); 1001 } else { 1002 ifp->if_mtu = TUNMTU; 1003 ifp->if_start = tunstart; 1004 ifp->if_output = tunoutput; 1005 1006 ifp->if_snd.ifq_drv_maxlen = 0; 1007 IFQ_SET_READY(&ifp->if_snd); 1008 1009 if_attach(ifp); 1010 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 1011 } 1012 1013 TUN_LOCK(tp); 1014 tp->tun_flags |= TUN_INITED; 1015 TUN_UNLOCK(tp); 1016 1017 TUNDEBUG(ifp, "interface %s is created, minor = %#x\n", 1018 ifp->if_xname, dev2unit(dev)); 1019 } 1020 1021 static void 1022 tunrename(void *arg __unused, struct ifnet *ifp) 1023 { 1024 struct tuntap_softc *tp; 1025 int error; 1026 1027 if ((ifp->if_flags & IFF_RENAMING) == 0) 1028 return; 1029 1030 if (tuntap_driver_from_ifnet(ifp) == NULL) 1031 return; 1032 1033 /* 1034 * We need to grab the ioctl sx long enough to make sure the softc is 1035 * still there. If it is, we can safely try to busy the tun device. 1036 * The busy may fail if the device is currently dying, in which case 1037 * we do nothing. If it doesn't fail, the busy count stops the device 1038 * from dying until we've created the alias (that will then be 1039 * subsequently destroyed). 1040 */ 1041 sx_xlock(&tun_ioctl_sx); 1042 tp = ifp->if_softc; 1043 if (tp == NULL) { 1044 sx_xunlock(&tun_ioctl_sx); 1045 return; 1046 } 1047 error = tun_busy(tp); 1048 sx_xunlock(&tun_ioctl_sx); 1049 if (error != 0) 1050 return; 1051 if (tp->tun_alias != NULL) { 1052 destroy_dev(tp->tun_alias); 1053 tp->tun_alias = NULL; 1054 } 1055 1056 if (strcmp(ifp->if_xname, tp->tun_dev->si_name) == 0) 1057 goto out; 1058 1059 /* 1060 * Failure's ok, aliases are created on a best effort basis. If a 1061 * tun user/consumer decides to rename the interface to conflict with 1062 * another device (non-ifnet) on the system, we will assume they know 1063 * what they are doing. make_dev_alias_p won't touch tun_alias on 1064 * failure, so we use it but ignore the return value. 1065 */ 1066 make_dev_alias_p(MAKEDEV_CHECKNAME, &tp->tun_alias, tp->tun_dev, "%s", 1067 ifp->if_xname); 1068 out: 1069 tun_unbusy(tp); 1070 } 1071 1072 static int 1073 tunopen(struct cdev *dev, int flag, int mode, struct thread *td) 1074 { 1075 struct ifnet *ifp; 1076 struct tuntap_softc *tp; 1077 int error __diagused, tunflags; 1078 1079 tunflags = 0; 1080 CURVNET_SET(TD_TO_VNET(td)); 1081 error = tuntap_name2info(dev->si_name, NULL, &tunflags); 1082 if (error != 0) { 1083 CURVNET_RESTORE(); 1084 return (error); /* Shouldn't happen */ 1085 } 1086 1087 tp = dev->si_drv1; 1088 KASSERT(tp != NULL, 1089 ("si_drv1 should have been initialized at creation")); 1090 1091 TUN_LOCK(tp); 1092 if ((tp->tun_flags & TUN_INITED) == 0) { 1093 TUN_UNLOCK(tp); 1094 CURVNET_RESTORE(); 1095 return (ENXIO); 1096 } 1097 if ((tp->tun_flags & (TUN_OPEN | TUN_DYING)) != 0) { 1098 TUN_UNLOCK(tp); 1099 CURVNET_RESTORE(); 1100 return (EBUSY); 1101 } 1102 1103 error = tun_busy_locked(tp); 1104 KASSERT(error == 0, ("Must be able to busy an unopen tunnel")); 1105 ifp = TUN2IFP(tp); 1106 1107 if ((tp->tun_flags & TUN_L2) != 0) { 1108 bcopy(IF_LLADDR(ifp), tp->tun_ether.octet, 1109 sizeof(tp->tun_ether.octet)); 1110 1111 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1112 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1113 1114 if (tapuponopen) 1115 ifp->if_flags |= IFF_UP; 1116 } 1117 1118 tp->tun_pid = td->td_proc->p_pid; 1119 tp->tun_flags |= TUN_OPEN; 1120 1121 if_link_state_change(ifp, LINK_STATE_UP); 1122 TUNDEBUG(ifp, "open\n"); 1123 TUN_UNLOCK(tp); 1124 1125 /* 1126 * This can fail with either ENOENT or EBUSY. This is in the middle of 1127 * d_open, so ENOENT should not be possible. EBUSY is possible, but 1128 * the only cdevpriv dtor being set will be tundtor and the softc being 1129 * passed is constant for a given cdev. We ignore the possible error 1130 * because of this as either "unlikely" or "not actually a problem." 1131 */ 1132 (void)devfs_set_cdevpriv(tp, tundtor); 1133 CURVNET_RESTORE(); 1134 return (0); 1135 } 1136 1137 /* 1138 * tundtor - tear down the device - mark i/f down & delete 1139 * routing info 1140 */ 1141 static void 1142 tundtor(void *data) 1143 { 1144 struct proc *p; 1145 struct tuntap_softc *tp; 1146 struct ifnet *ifp; 1147 bool l2tun; 1148 1149 tp = data; 1150 p = curproc; 1151 ifp = TUN2IFP(tp); 1152 1153 TUN_LOCK(tp); 1154 1155 /* 1156 * Realistically, we can't be obstinate here. This only means that the 1157 * tuntap device was closed out of order, and the last closer wasn't the 1158 * controller. These are still good to know about, though, as software 1159 * should avoid multiple processes with a tuntap device open and 1160 * ill-defined transfer of control (e.g., handoff, TUNSIFPID, close in 1161 * parent). 1162 */ 1163 if (p->p_pid != tp->tun_pid) { 1164 log(LOG_INFO, 1165 "pid %d (%s), %s: tun/tap protocol violation, non-controlling process closed last.\n", 1166 p->p_pid, p->p_comm, tp->tun_dev->si_name); 1167 } 1168 1169 /* 1170 * junk all pending output 1171 */ 1172 CURVNET_SET(ifp->if_vnet); 1173 1174 l2tun = false; 1175 if ((tp->tun_flags & TUN_L2) != 0) { 1176 l2tun = true; 1177 IF_DRAIN(&ifp->if_snd); 1178 } else { 1179 IFQ_PURGE(&ifp->if_snd); 1180 } 1181 1182 /* For vmnet, we won't do most of the address/route bits */ 1183 if ((tp->tun_flags & TUN_VMNET) != 0 || 1184 (l2tun && (ifp->if_flags & IFF_LINK0) != 0)) 1185 goto out; 1186 #if defined(INET) || defined(INET6) 1187 if (l2tun && tp->tun_lro_ready) { 1188 TUNDEBUG (ifp, "LRO disabled\n"); 1189 tcp_lro_free(&tp->tun_lro); 1190 tp->tun_lro_ready = false; 1191 } 1192 #endif 1193 if (ifp->if_flags & IFF_UP) { 1194 TUN_UNLOCK(tp); 1195 if_down(ifp); 1196 TUN_LOCK(tp); 1197 } 1198 1199 /* Delete all addresses and routes which reference this interface. */ 1200 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1201 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1202 TUN_UNLOCK(tp); 1203 if_purgeaddrs(ifp); 1204 TUN_LOCK(tp); 1205 } 1206 1207 out: 1208 if_link_state_change(ifp, LINK_STATE_DOWN); 1209 CURVNET_RESTORE(); 1210 1211 funsetown(&tp->tun_sigio); 1212 selwakeuppri(&tp->tun_rsel, PZERO); 1213 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 1214 TUNDEBUG (ifp, "closed\n"); 1215 tp->tun_flags &= ~TUN_OPEN; 1216 tp->tun_pid = 0; 1217 tun_vnethdr_set(ifp, 0); 1218 1219 tun_unbusy_locked(tp); 1220 TUN_UNLOCK(tp); 1221 } 1222 1223 static void 1224 tuninit(struct ifnet *ifp) 1225 { 1226 struct tuntap_softc *tp = ifp->if_softc; 1227 1228 TUNDEBUG(ifp, "tuninit\n"); 1229 1230 TUN_LOCK(tp); 1231 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1232 if ((tp->tun_flags & TUN_L2) == 0) { 1233 ifp->if_flags |= IFF_UP; 1234 getmicrotime(&ifp->if_lastchange); 1235 TUN_UNLOCK(tp); 1236 } else { 1237 #if defined(INET) || defined(INET6) 1238 if (tcp_lro_init(&tp->tun_lro) == 0) { 1239 TUNDEBUG(ifp, "LRO enabled\n"); 1240 tp->tun_lro.ifp = ifp; 1241 tp->tun_lro_ready = true; 1242 } else { 1243 TUNDEBUG(ifp, "Could not enable LRO\n"); 1244 tp->tun_lro_ready = false; 1245 } 1246 #endif 1247 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1248 TUN_UNLOCK(tp); 1249 /* attempt to start output */ 1250 tunstart_l2(ifp); 1251 } 1252 1253 } 1254 1255 /* 1256 * Used only for l2 tunnel. 1257 */ 1258 static void 1259 tunifinit(void *xtp) 1260 { 1261 struct tuntap_softc *tp; 1262 1263 tp = (struct tuntap_softc *)xtp; 1264 tuninit(tp->tun_ifp); 1265 } 1266 1267 /* 1268 * To be called under TUN_LOCK. Update ifp->if_hwassist according to the 1269 * current value of ifp->if_capenable. 1270 */ 1271 static void 1272 tun_caps_changed(struct ifnet *ifp) 1273 { 1274 uint64_t hwassist = 0; 1275 1276 TUN_LOCK_ASSERT((struct tuntap_softc *)ifp->if_softc); 1277 if (ifp->if_capenable & IFCAP_TXCSUM) 1278 hwassist |= CSUM_TCP | CSUM_UDP; 1279 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) 1280 hwassist |= CSUM_TCP_IPV6 1281 | CSUM_UDP_IPV6; 1282 if (ifp->if_capenable & IFCAP_TSO4) 1283 hwassist |= CSUM_IP_TSO; 1284 if (ifp->if_capenable & IFCAP_TSO6) 1285 hwassist |= CSUM_IP6_TSO; 1286 ifp->if_hwassist = hwassist; 1287 } 1288 1289 /* 1290 * To be called under TUN_LOCK. Update tp->tun_vhdrlen and adjust 1291 * if_capabilities and if_capenable as needed. 1292 */ 1293 static void 1294 tun_vnethdr_set(struct ifnet *ifp, int vhdrlen) 1295 { 1296 struct tuntap_softc *tp = ifp->if_softc; 1297 1298 TUN_LOCK_ASSERT(tp); 1299 1300 if (tp->tun_vhdrlen == vhdrlen) 1301 return; 1302 1303 /* 1304 * Update if_capabilities to reflect the 1305 * functionalities offered by the virtio-net 1306 * header. 1307 */ 1308 if (vhdrlen != 0) 1309 ifp->if_capabilities |= 1310 TAP_VNET_HDR_CAPS; 1311 else 1312 ifp->if_capabilities &= 1313 ~TAP_VNET_HDR_CAPS; 1314 /* 1315 * Disable any capabilities that we don't 1316 * support anymore. 1317 */ 1318 ifp->if_capenable &= ifp->if_capabilities; 1319 tun_caps_changed(ifp); 1320 tp->tun_vhdrlen = vhdrlen; 1321 1322 TUNDEBUG(ifp, "vnet_hdr_len=%d, if_capabilities=%x\n", 1323 vhdrlen, ifp->if_capabilities); 1324 } 1325 1326 /* 1327 * Process an ioctl request. 1328 */ 1329 static int 1330 tunifioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1331 { 1332 struct ifreq *ifr = (struct ifreq *)data; 1333 struct tuntap_softc *tp; 1334 struct ifstat *ifs; 1335 struct ifmediareq *ifmr; 1336 int dummy, error = 0; 1337 bool l2tun; 1338 1339 ifmr = NULL; 1340 sx_xlock(&tun_ioctl_sx); 1341 tp = ifp->if_softc; 1342 if (tp == NULL) { 1343 error = ENXIO; 1344 goto bad; 1345 } 1346 l2tun = (tp->tun_flags & TUN_L2) != 0; 1347 switch(cmd) { 1348 case SIOCGIFSTATUS: 1349 ifs = (struct ifstat *)data; 1350 TUN_LOCK(tp); 1351 if (tp->tun_pid) 1352 snprintf(ifs->ascii, sizeof(ifs->ascii), 1353 "\tOpened by PID %d\n", tp->tun_pid); 1354 else 1355 ifs->ascii[0] = '\0'; 1356 TUN_UNLOCK(tp); 1357 break; 1358 case SIOCSIFADDR: 1359 if (l2tun) 1360 error = ether_ioctl(ifp, cmd, data); 1361 else 1362 tuninit(ifp); 1363 if (error == 0) 1364 TUNDEBUG(ifp, "address set\n"); 1365 break; 1366 case SIOCSIFMTU: 1367 ifp->if_mtu = ifr->ifr_mtu; 1368 TUNDEBUG(ifp, "mtu set\n"); 1369 break; 1370 case SIOCSIFFLAGS: 1371 case SIOCADDMULTI: 1372 case SIOCDELMULTI: 1373 break; 1374 case SIOCGIFMEDIA: 1375 if (!l2tun) { 1376 error = EINVAL; 1377 break; 1378 } 1379 1380 ifmr = (struct ifmediareq *)data; 1381 dummy = ifmr->ifm_count; 1382 ifmr->ifm_count = 1; 1383 ifmr->ifm_status = IFM_AVALID; 1384 ifmr->ifm_active = IFM_ETHER | IFM_FDX | IFM_1000_T; 1385 if (tp->tun_flags & TUN_OPEN) 1386 ifmr->ifm_status |= IFM_ACTIVE; 1387 ifmr->ifm_current = ifmr->ifm_active; 1388 if (dummy >= 1) { 1389 int media = IFM_ETHER; 1390 error = copyout(&media, ifmr->ifm_ulist, sizeof(int)); 1391 } 1392 break; 1393 case SIOCSIFCAP: 1394 TUN_LOCK(tp); 1395 ifp->if_capenable = ifr->ifr_reqcap; 1396 tun_caps_changed(ifp); 1397 TUN_UNLOCK(tp); 1398 VLAN_CAPABILITIES(ifp); 1399 break; 1400 default: 1401 if (l2tun) { 1402 error = ether_ioctl(ifp, cmd, data); 1403 } else { 1404 error = EINVAL; 1405 } 1406 } 1407 bad: 1408 sx_xunlock(&tun_ioctl_sx); 1409 return (error); 1410 } 1411 1412 /* 1413 * tunoutput - queue packets from higher level ready to put out. 1414 */ 1415 static int 1416 tunoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 1417 struct route *ro) 1418 { 1419 struct tuntap_softc *tp = ifp->if_softc; 1420 u_short cached_tun_flags; 1421 int error; 1422 u_int32_t af; 1423 1424 TUNDEBUG (ifp, "tunoutput\n"); 1425 1426 #ifdef MAC 1427 error = mac_ifnet_check_transmit(ifp, m0); 1428 if (error) { 1429 m_freem(m0); 1430 return (error); 1431 } 1432 #endif 1433 1434 /* Could be unlocked read? */ 1435 TUN_LOCK(tp); 1436 cached_tun_flags = tp->tun_flags; 1437 TUN_UNLOCK(tp); 1438 if ((cached_tun_flags & TUN_READY) != TUN_READY) { 1439 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 1440 m_freem (m0); 1441 return (EHOSTDOWN); 1442 } 1443 1444 if ((ifp->if_flags & IFF_UP) != IFF_UP) { 1445 m_freem (m0); 1446 return (EHOSTDOWN); 1447 } 1448 1449 /* BPF writes need to be handled specially. */ 1450 if (dst->sa_family == AF_UNSPEC || dst->sa_family == pseudo_AF_HDRCMPLT) 1451 bcopy(dst->sa_data, &af, sizeof(af)); 1452 else 1453 af = RO_GET_FAMILY(ro, dst); 1454 1455 BPF_MTAP2(ifp, &af, sizeof(af), m0); 1456 1457 /* prepend sockaddr? this may abort if the mbuf allocation fails */ 1458 if (cached_tun_flags & TUN_LMODE) { 1459 /* allocate space for sockaddr */ 1460 M_PREPEND(m0, dst->sa_len, M_NOWAIT); 1461 1462 /* if allocation failed drop packet */ 1463 if (m0 == NULL) { 1464 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1); 1465 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 1466 return (ENOBUFS); 1467 } else { 1468 bcopy(dst, m0->m_data, dst->sa_len); 1469 } 1470 } 1471 1472 if (cached_tun_flags & TUN_IFHEAD) { 1473 /* Prepend the address family */ 1474 M_PREPEND(m0, 4, M_NOWAIT); 1475 1476 /* if allocation failed drop packet */ 1477 if (m0 == NULL) { 1478 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1); 1479 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 1480 return (ENOBUFS); 1481 } else 1482 *(u_int32_t *)m0->m_data = htonl(af); 1483 } else { 1484 #ifdef INET 1485 if (af != AF_INET) 1486 #endif 1487 { 1488 m_freem(m0); 1489 return (EAFNOSUPPORT); 1490 } 1491 } 1492 1493 error = (ifp->if_transmit)(ifp, m0); 1494 if (error) 1495 return (ENOBUFS); 1496 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 1497 return (0); 1498 } 1499 1500 /* 1501 * the cdevsw interface is now pretty minimal. 1502 */ 1503 static int 1504 tunioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, 1505 struct thread *td) 1506 { 1507 struct ifreq ifr, *ifrp; 1508 struct tuntap_softc *tp = dev->si_drv1; 1509 struct ifnet *ifp = TUN2IFP(tp); 1510 struct tuninfo *tunp; 1511 int error, iflags, ival; 1512 bool l2tun; 1513 1514 l2tun = (tp->tun_flags & TUN_L2) != 0; 1515 if (l2tun) { 1516 /* tap specific ioctls */ 1517 switch(cmd) { 1518 /* VMware/VMnet port ioctl's */ 1519 #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 1520 defined(COMPAT_FREEBSD4) 1521 case _IO('V', 0): 1522 ival = IOCPARM_IVAL(data); 1523 data = (caddr_t)&ival; 1524 /* FALLTHROUGH */ 1525 #endif 1526 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 1527 iflags = *(int *)data; 1528 iflags &= TUN_VMIO_FLAG_MASK; 1529 iflags &= ~IFF_CANTCHANGE; 1530 iflags |= IFF_UP; 1531 1532 TUN_LOCK(tp); 1533 ifp->if_flags = iflags | 1534 (ifp->if_flags & IFF_CANTCHANGE); 1535 TUN_UNLOCK(tp); 1536 1537 return (0); 1538 case SIOCGIFADDR: /* get MAC address of the remote side */ 1539 TUN_LOCK(tp); 1540 bcopy(&tp->tun_ether.octet, data, 1541 sizeof(tp->tun_ether.octet)); 1542 TUN_UNLOCK(tp); 1543 1544 return (0); 1545 case SIOCSIFADDR: /* set MAC address of the remote side */ 1546 TUN_LOCK(tp); 1547 bcopy(data, &tp->tun_ether.octet, 1548 sizeof(tp->tun_ether.octet)); 1549 TUN_UNLOCK(tp); 1550 1551 return (0); 1552 case TAPSVNETHDR: 1553 ival = *(int *)data; 1554 if (ival != 0 && 1555 ival != sizeof(struct virtio_net_hdr) && 1556 ival != sizeof(struct virtio_net_hdr_mrg_rxbuf)) { 1557 return (EINVAL); 1558 } 1559 TUN_LOCK(tp); 1560 tun_vnethdr_set(ifp, ival); 1561 TUN_UNLOCK(tp); 1562 1563 return (0); 1564 case TAPGVNETHDR: 1565 TUN_LOCK(tp); 1566 *(int *)data = tp->tun_vhdrlen; 1567 TUN_UNLOCK(tp); 1568 1569 return (0); 1570 } 1571 1572 /* Fall through to the common ioctls if unhandled */ 1573 } else { 1574 switch (cmd) { 1575 case TUNSLMODE: 1576 TUN_LOCK(tp); 1577 if (*(int *)data) { 1578 tp->tun_flags |= TUN_LMODE; 1579 tp->tun_flags &= ~TUN_IFHEAD; 1580 } else 1581 tp->tun_flags &= ~TUN_LMODE; 1582 TUN_UNLOCK(tp); 1583 1584 return (0); 1585 case TUNSIFHEAD: 1586 TUN_LOCK(tp); 1587 if (*(int *)data) { 1588 tp->tun_flags |= TUN_IFHEAD; 1589 tp->tun_flags &= ~TUN_LMODE; 1590 } else 1591 tp->tun_flags &= ~TUN_IFHEAD; 1592 TUN_UNLOCK(tp); 1593 1594 return (0); 1595 case TUNGIFHEAD: 1596 TUN_LOCK(tp); 1597 *(int *)data = (tp->tun_flags & TUN_IFHEAD) ? 1 : 0; 1598 TUN_UNLOCK(tp); 1599 1600 return (0); 1601 case TUNSIFMODE: 1602 /* deny this if UP */ 1603 if (TUN2IFP(tp)->if_flags & IFF_UP) 1604 return (EBUSY); 1605 1606 switch (*(int *)data & ~IFF_MULTICAST) { 1607 case IFF_POINTOPOINT: 1608 case IFF_BROADCAST: 1609 TUN_LOCK(tp); 1610 TUN2IFP(tp)->if_flags &= 1611 ~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST); 1612 TUN2IFP(tp)->if_flags |= *(int *)data; 1613 TUN_UNLOCK(tp); 1614 1615 break; 1616 default: 1617 return (EINVAL); 1618 } 1619 1620 return (0); 1621 case TUNSIFPID: 1622 TUN_LOCK(tp); 1623 tp->tun_pid = curthread->td_proc->p_pid; 1624 TUN_UNLOCK(tp); 1625 1626 return (0); 1627 } 1628 /* Fall through to the common ioctls if unhandled */ 1629 } 1630 1631 switch (cmd) { 1632 case TUNGIFNAME: 1633 ifrp = (struct ifreq *)data; 1634 strlcpy(ifrp->ifr_name, TUN2IFP(tp)->if_xname, IFNAMSIZ); 1635 1636 return (0); 1637 case TUNSIFINFO: 1638 tunp = (struct tuninfo *)data; 1639 if (TUN2IFP(tp)->if_type != tunp->type) 1640 return (EPROTOTYPE); 1641 TUN_LOCK(tp); 1642 if (TUN2IFP(tp)->if_mtu != tunp->mtu) { 1643 strlcpy(ifr.ifr_name, if_name(TUN2IFP(tp)), IFNAMSIZ); 1644 ifr.ifr_mtu = tunp->mtu; 1645 CURVNET_SET(TUN2IFP(tp)->if_vnet); 1646 error = ifhwioctl(SIOCSIFMTU, TUN2IFP(tp), 1647 (caddr_t)&ifr, td); 1648 CURVNET_RESTORE(); 1649 if (error) { 1650 TUN_UNLOCK(tp); 1651 return (error); 1652 } 1653 } 1654 TUN2IFP(tp)->if_baudrate = tunp->baudrate; 1655 TUN_UNLOCK(tp); 1656 break; 1657 case TUNGIFINFO: 1658 tunp = (struct tuninfo *)data; 1659 TUN_LOCK(tp); 1660 tunp->mtu = TUN2IFP(tp)->if_mtu; 1661 tunp->type = TUN2IFP(tp)->if_type; 1662 tunp->baudrate = TUN2IFP(tp)->if_baudrate; 1663 TUN_UNLOCK(tp); 1664 break; 1665 case TUNSDEBUG: 1666 tundebug = *(int *)data; 1667 break; 1668 case TUNGDEBUG: 1669 *(int *)data = tundebug; 1670 break; 1671 case FIONBIO: 1672 break; 1673 case FIOASYNC: 1674 TUN_LOCK(tp); 1675 if (*(int *)data) 1676 tp->tun_flags |= TUN_ASYNC; 1677 else 1678 tp->tun_flags &= ~TUN_ASYNC; 1679 TUN_UNLOCK(tp); 1680 break; 1681 case FIONREAD: 1682 if (!IFQ_IS_EMPTY(&TUN2IFP(tp)->if_snd)) { 1683 struct mbuf *mb; 1684 IFQ_LOCK(&TUN2IFP(tp)->if_snd); 1685 IFQ_POLL_NOLOCK(&TUN2IFP(tp)->if_snd, mb); 1686 for (*(int *)data = 0; mb != NULL; mb = mb->m_next) 1687 *(int *)data += mb->m_len; 1688 IFQ_UNLOCK(&TUN2IFP(tp)->if_snd); 1689 } else 1690 *(int *)data = 0; 1691 break; 1692 case FIOSETOWN: 1693 return (fsetown(*(int *)data, &tp->tun_sigio)); 1694 1695 case FIOGETOWN: 1696 *(int *)data = fgetown(&tp->tun_sigio); 1697 return (0); 1698 1699 /* This is deprecated, FIOSETOWN should be used instead. */ 1700 case TIOCSPGRP: 1701 return (fsetown(-(*(int *)data), &tp->tun_sigio)); 1702 1703 /* This is deprecated, FIOGETOWN should be used instead. */ 1704 case TIOCGPGRP: 1705 *(int *)data = -fgetown(&tp->tun_sigio); 1706 return (0); 1707 1708 default: 1709 return (ENOTTY); 1710 } 1711 return (0); 1712 } 1713 1714 /* 1715 * The cdevsw read interface - reads a packet at a time, or at 1716 * least as much of a packet as can be read. 1717 */ 1718 static int 1719 tunread(struct cdev *dev, struct uio *uio, int flag) 1720 { 1721 struct tuntap_softc *tp = dev->si_drv1; 1722 struct ifnet *ifp = TUN2IFP(tp); 1723 struct mbuf *m; 1724 size_t len; 1725 int error = 0; 1726 1727 TUNDEBUG (ifp, "read\n"); 1728 TUN_LOCK(tp); 1729 if ((tp->tun_flags & TUN_READY) != TUN_READY) { 1730 TUN_UNLOCK(tp); 1731 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 1732 return (EHOSTDOWN); 1733 } 1734 1735 tp->tun_flags &= ~TUN_RWAIT; 1736 1737 for (;;) { 1738 IFQ_DEQUEUE(&ifp->if_snd, m); 1739 if (m != NULL) 1740 break; 1741 if (flag & O_NONBLOCK) { 1742 TUN_UNLOCK(tp); 1743 return (EWOULDBLOCK); 1744 } 1745 tp->tun_flags |= TUN_RWAIT; 1746 error = mtx_sleep(tp, &tp->tun_mtx, PCATCH | PZERO, 1747 "tunread", 0); 1748 if (error != 0) { 1749 TUN_UNLOCK(tp); 1750 return (error); 1751 } 1752 } 1753 TUN_UNLOCK(tp); 1754 1755 len = min(tp->tun_vhdrlen, uio->uio_resid); 1756 if (len > 0) { 1757 struct virtio_net_hdr_mrg_rxbuf vhdr; 1758 1759 bzero(&vhdr, sizeof(vhdr)); 1760 if (m->m_pkthdr.csum_flags & TAP_ALL_OFFLOAD) { 1761 m = virtio_net_tx_offload(ifp, m, false, &vhdr.hdr); 1762 } 1763 1764 TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, " 1765 "gs %u, cs %u, co %u\n", vhdr.hdr.flags, 1766 vhdr.hdr.gso_type, vhdr.hdr.hdr_len, 1767 vhdr.hdr.gso_size, vhdr.hdr.csum_start, 1768 vhdr.hdr.csum_offset); 1769 error = uiomove(&vhdr, len, uio); 1770 } 1771 if (error == 0) 1772 error = m_mbuftouio(uio, m, 0); 1773 m_freem(m); 1774 return (error); 1775 } 1776 1777 static int 1778 tunwrite_l2(struct tuntap_softc *tp, struct mbuf *m, 1779 struct virtio_net_hdr_mrg_rxbuf *vhdr) 1780 { 1781 struct epoch_tracker et; 1782 struct ether_header *eh; 1783 struct ifnet *ifp; 1784 1785 ifp = TUN2IFP(tp); 1786 1787 /* 1788 * Only pass a unicast frame to ether_input(), if it would 1789 * actually have been received by non-virtual hardware. 1790 */ 1791 if (m->m_len < sizeof(struct ether_header)) { 1792 m_freem(m); 1793 return (0); 1794 } 1795 1796 eh = mtod(m, struct ether_header *); 1797 1798 if ((ifp->if_flags & IFF_PROMISC) == 0 && 1799 !ETHER_IS_MULTICAST(eh->ether_dhost) && 1800 bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) { 1801 m_freem(m); 1802 return (0); 1803 } 1804 1805 if (vhdr != NULL) { 1806 if (virtio_net_rx_csum(m, &vhdr->hdr)) { 1807 m_freem(m); 1808 return (0); 1809 } 1810 } else { 1811 switch (ntohs(eh->ether_type)) { 1812 #ifdef INET 1813 case ETHERTYPE_IP: 1814 if (ifp->if_capenable & IFCAP_RXCSUM) { 1815 m->m_pkthdr.csum_flags |= 1816 CSUM_IP_CHECKED | CSUM_IP_VALID | 1817 CSUM_DATA_VALID | CSUM_SCTP_VALID | 1818 CSUM_PSEUDO_HDR; 1819 m->m_pkthdr.csum_data = 0xffff; 1820 } 1821 break; 1822 #endif 1823 #ifdef INET6 1824 case ETHERTYPE_IPV6: 1825 if (ifp->if_capenable & IFCAP_RXCSUM_IPV6) { 1826 m->m_pkthdr.csum_flags |= 1827 CSUM_DATA_VALID_IPV6 | CSUM_SCTP_VALID | 1828 CSUM_PSEUDO_HDR; 1829 m->m_pkthdr.csum_data = 0xffff; 1830 } 1831 break; 1832 #endif 1833 } 1834 } 1835 1836 /* Pass packet up to parent. */ 1837 CURVNET_SET(ifp->if_vnet); 1838 NET_EPOCH_ENTER(et); 1839 #if defined(INET) || defined(INET6) 1840 if (tp->tun_lro_ready && ifp->if_capenable & IFCAP_LRO && 1841 tcp_lro_rx(&tp->tun_lro, m, 0) == 0) 1842 tcp_lro_flush_all(&tp->tun_lro); 1843 else 1844 #endif 1845 (*ifp->if_input)(ifp, m); 1846 NET_EPOCH_EXIT(et); 1847 CURVNET_RESTORE(); 1848 /* ibytes are counted in parent */ 1849 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 1850 return (0); 1851 } 1852 1853 static int 1854 tunwrite_l3(struct tuntap_softc *tp, struct mbuf *m) 1855 { 1856 struct epoch_tracker et; 1857 struct ifnet *ifp; 1858 int family, isr; 1859 1860 ifp = TUN2IFP(tp); 1861 /* Could be unlocked read? */ 1862 TUN_LOCK(tp); 1863 if (tp->tun_flags & TUN_IFHEAD) { 1864 TUN_UNLOCK(tp); 1865 if (m->m_len < sizeof(family) && 1866 (m = m_pullup(m, sizeof(family))) == NULL) 1867 return (ENOBUFS); 1868 family = ntohl(*mtod(m, u_int32_t *)); 1869 m_adj(m, sizeof(family)); 1870 } else { 1871 TUN_UNLOCK(tp); 1872 family = AF_INET; 1873 } 1874 1875 BPF_MTAP2(ifp, &family, sizeof(family), m); 1876 1877 switch (family) { 1878 #ifdef INET 1879 case AF_INET: 1880 isr = NETISR_IP; 1881 break; 1882 #endif 1883 #ifdef INET6 1884 case AF_INET6: 1885 isr = NETISR_IPV6; 1886 break; 1887 #endif 1888 default: 1889 m_freem(m); 1890 return (EAFNOSUPPORT); 1891 } 1892 random_harvest_queue(m, sizeof(*m), RANDOM_NET_TUN); 1893 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 1894 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 1895 CURVNET_SET(ifp->if_vnet); 1896 M_SETFIB(m, ifp->if_fib); 1897 NET_EPOCH_ENTER(et); 1898 netisr_dispatch(isr, m); 1899 NET_EPOCH_EXIT(et); 1900 CURVNET_RESTORE(); 1901 return (0); 1902 } 1903 1904 /* 1905 * the cdevsw write interface - an atomic write is a packet - or else! 1906 */ 1907 static int 1908 tunwrite(struct cdev *dev, struct uio *uio, int flag) 1909 { 1910 struct virtio_net_hdr_mrg_rxbuf vhdr; 1911 struct tuntap_softc *tp; 1912 struct ifnet *ifp; 1913 struct mbuf *m; 1914 uint32_t mru; 1915 int align, vhdrlen, error; 1916 bool l2tun; 1917 1918 tp = dev->si_drv1; 1919 ifp = TUN2IFP(tp); 1920 TUNDEBUG(ifp, "tunwrite\n"); 1921 if ((ifp->if_flags & IFF_UP) != IFF_UP) 1922 /* ignore silently */ 1923 return (0); 1924 1925 if (uio->uio_resid == 0) 1926 return (0); 1927 1928 l2tun = (tp->tun_flags & TUN_L2) != 0; 1929 mru = l2tun ? TAPMRU : TUNMRU; 1930 vhdrlen = tp->tun_vhdrlen; 1931 align = 0; 1932 if (l2tun) { 1933 align = ETHER_ALIGN; 1934 mru += vhdrlen; 1935 } else if ((tp->tun_flags & TUN_IFHEAD) != 0) 1936 mru += sizeof(uint32_t); /* family */ 1937 if (uio->uio_resid < 0 || uio->uio_resid > mru) { 1938 TUNDEBUG(ifp, "len=%zd!\n", uio->uio_resid); 1939 return (EIO); 1940 } 1941 1942 if (vhdrlen > 0) { 1943 error = uiomove(&vhdr, vhdrlen, uio); 1944 if (error != 0) 1945 return (error); 1946 TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, " 1947 "gs %u, cs %u, co %u\n", vhdr.hdr.flags, 1948 vhdr.hdr.gso_type, vhdr.hdr.hdr_len, 1949 vhdr.hdr.gso_size, vhdr.hdr.csum_start, 1950 vhdr.hdr.csum_offset); 1951 } 1952 1953 if ((m = m_uiotombuf(uio, M_NOWAIT, 0, align, M_PKTHDR)) == NULL) { 1954 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 1955 return (ENOBUFS); 1956 } 1957 1958 m->m_pkthdr.rcvif = ifp; 1959 #ifdef MAC 1960 mac_ifnet_create_mbuf(ifp, m); 1961 #endif 1962 1963 if (l2tun) 1964 return (tunwrite_l2(tp, m, vhdrlen > 0 ? &vhdr : NULL)); 1965 1966 return (tunwrite_l3(tp, m)); 1967 } 1968 1969 /* 1970 * tunpoll - the poll interface, this is only useful on reads 1971 * really. The write detect always returns true, write never blocks 1972 * anyway, it either accepts the packet or drops it. 1973 */ 1974 static int 1975 tunpoll(struct cdev *dev, int events, struct thread *td) 1976 { 1977 struct tuntap_softc *tp = dev->si_drv1; 1978 struct ifnet *ifp = TUN2IFP(tp); 1979 int revents = 0; 1980 1981 TUNDEBUG(ifp, "tunpoll\n"); 1982 1983 if (events & (POLLIN | POLLRDNORM)) { 1984 IFQ_LOCK(&ifp->if_snd); 1985 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 1986 TUNDEBUG(ifp, "tunpoll q=%d\n", ifp->if_snd.ifq_len); 1987 revents |= events & (POLLIN | POLLRDNORM); 1988 } else { 1989 TUNDEBUG(ifp, "tunpoll waiting\n"); 1990 selrecord(td, &tp->tun_rsel); 1991 } 1992 IFQ_UNLOCK(&ifp->if_snd); 1993 } 1994 revents |= events & (POLLOUT | POLLWRNORM); 1995 1996 return (revents); 1997 } 1998 1999 /* 2000 * tunkqfilter - support for the kevent() system call. 2001 */ 2002 static int 2003 tunkqfilter(struct cdev *dev, struct knote *kn) 2004 { 2005 struct tuntap_softc *tp = dev->si_drv1; 2006 struct ifnet *ifp = TUN2IFP(tp); 2007 2008 switch(kn->kn_filter) { 2009 case EVFILT_READ: 2010 TUNDEBUG(ifp, "%s kqfilter: EVFILT_READ, minor = %#x\n", 2011 ifp->if_xname, dev2unit(dev)); 2012 kn->kn_fop = &tun_read_filterops; 2013 break; 2014 2015 case EVFILT_WRITE: 2016 TUNDEBUG(ifp, "%s kqfilter: EVFILT_WRITE, minor = %#x\n", 2017 ifp->if_xname, dev2unit(dev)); 2018 kn->kn_fop = &tun_write_filterops; 2019 break; 2020 2021 default: 2022 TUNDEBUG(ifp, "%s kqfilter: invalid filter, minor = %#x\n", 2023 ifp->if_xname, dev2unit(dev)); 2024 return(EINVAL); 2025 } 2026 2027 kn->kn_hook = tp; 2028 knlist_add(&tp->tun_rsel.si_note, kn, 0); 2029 2030 return (0); 2031 } 2032 2033 /* 2034 * Return true of there is data in the interface queue. 2035 */ 2036 static int 2037 tunkqread(struct knote *kn, long hint) 2038 { 2039 int ret; 2040 struct tuntap_softc *tp = kn->kn_hook; 2041 struct cdev *dev = tp->tun_dev; 2042 struct ifnet *ifp = TUN2IFP(tp); 2043 2044 if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) { 2045 TUNDEBUG(ifp, 2046 "%s have data in the queue. Len = %d, minor = %#x\n", 2047 ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev)); 2048 ret = 1; 2049 } else { 2050 TUNDEBUG(ifp, 2051 "%s waiting for data, minor = %#x\n", ifp->if_xname, 2052 dev2unit(dev)); 2053 ret = 0; 2054 } 2055 2056 return (ret); 2057 } 2058 2059 /* 2060 * Always can write, always return MTU in kn->data. 2061 */ 2062 static int 2063 tunkqwrite(struct knote *kn, long hint) 2064 { 2065 struct tuntap_softc *tp = kn->kn_hook; 2066 struct ifnet *ifp = TUN2IFP(tp); 2067 2068 kn->kn_data = ifp->if_mtu; 2069 2070 return (1); 2071 } 2072 2073 static void 2074 tunkqdetach(struct knote *kn) 2075 { 2076 struct tuntap_softc *tp = kn->kn_hook; 2077 2078 knlist_remove(&tp->tun_rsel.si_note, kn, 0); 2079 } 2080