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 #define TUN_TRANSIENT 0x1000 136 137 #define TUN_DRIVER_IDENT_MASK (TUN_L2 | TUN_VMNET) 138 #define TUN_READY (TUN_OPEN | TUN_INITED) 139 140 pid_t tun_pid; /* owning pid */ 141 struct ifnet *tun_ifp; /* the interface */ 142 struct sigio *tun_sigio; /* async I/O info */ 143 struct tuntap_driver *tun_drv; /* appropriate driver */ 144 struct selinfo tun_rsel; /* read select */ 145 struct mtx tun_mtx; /* softc field mutex */ 146 struct cv tun_cv; /* for ref'd dev destroy */ 147 struct ether_addr tun_ether; /* remote address */ 148 int tun_busy; /* busy count */ 149 int tun_vhdrlen; /* virtio-net header length */ 150 struct lro_ctrl tun_lro; /* for TCP LRO */ 151 bool tun_lro_ready; /* TCP LRO initialized */ 152 }; 153 #define TUN2IFP(sc) ((sc)->tun_ifp) 154 155 #define TUNDEBUG if (tundebug) if_printf 156 157 #define TUN_LOCK(tp) mtx_lock(&(tp)->tun_mtx) 158 #define TUN_UNLOCK(tp) mtx_unlock(&(tp)->tun_mtx) 159 #define TUN_LOCK_ASSERT(tp) mtx_assert(&(tp)->tun_mtx, MA_OWNED); 160 161 #define TUN_VMIO_FLAG_MASK 0x0fff 162 163 /* 164 * Interface capabilities of a tap device that supports the virtio-net 165 * header. 166 */ 167 #define TAP_VNET_HDR_CAPS (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6 \ 168 | IFCAP_VLAN_HWCSUM \ 169 | IFCAP_TSO | IFCAP_LRO \ 170 | IFCAP_VLAN_HWTSO) 171 172 #define TAP_ALL_OFFLOAD (CSUM_TSO | CSUM_TCP | CSUM_UDP |\ 173 CSUM_TCP_IPV6 | CSUM_UDP_IPV6) 174 175 /* 176 * All mutable global variables in if_tun are locked using tunmtx, with 177 * the exception of tundebug, which is used unlocked, and the drivers' *clones, 178 * which are static after setup. 179 */ 180 static struct mtx tunmtx; 181 static eventhandler_tag arrival_tag; 182 static eventhandler_tag clone_tag; 183 static int tuntap_osd_jail_slot; 184 static const char tunname[] = "tun"; 185 static const char tapname[] = "tap"; 186 static const char vmnetname[] = "vmnet"; 187 static MALLOC_DEFINE(M_TUN, tunname, "Tunnel Interface"); 188 static int tundebug = 0; 189 static int tundclone = 1; 190 static int tap_allow_uopen = 0; /* allow user devfs cloning */ 191 static int tapuponopen = 0; /* IFF_UP on open() */ 192 static int tapdclone = 1; /* enable devfs cloning */ 193 194 static TAILQ_HEAD(,tuntap_softc) tunhead = TAILQ_HEAD_INITIALIZER(tunhead); 195 SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, ""); 196 197 static struct sx tun_ioctl_sx; 198 SX_SYSINIT(tun_ioctl_sx, &tun_ioctl_sx, "tun_ioctl"); 199 200 SYSCTL_DECL(_net_link); 201 /* tun */ 202 static SYSCTL_NODE(_net_link, OID_AUTO, tun, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 203 "IP tunnel software network interface"); 204 SYSCTL_INT(_net_link_tun, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tundclone, 0, 205 "Enable legacy devfs interface creation"); 206 207 /* tap */ 208 static SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 209 "Ethernet tunnel software network interface"); 210 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tap_allow_uopen, 0, 211 "Enable legacy devfs interface creation for all users"); 212 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0, 213 "Bring interface up when /dev/tap is opened"); 214 SYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tapdclone, 0, 215 "Enable legacy devfs interface creation"); 216 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tundebug, 0, ""); 217 218 static int tun_create_device(struct tuntap_driver *drv, int unit, 219 struct ucred *cr, struct cdev **dev, const char *name); 220 static int tun_busy_locked(struct tuntap_softc *tp); 221 static void tun_unbusy_locked(struct tuntap_softc *tp); 222 static int tun_busy(struct tuntap_softc *tp); 223 static void tun_unbusy(struct tuntap_softc *tp); 224 225 static int tuntap_name2info(const char *name, int *unit, int *flags); 226 static void tunclone(void *arg, struct ucred *cred, char *name, 227 int namelen, struct cdev **dev); 228 static void tuncreate(struct cdev *dev); 229 static void tundtor(void *data); 230 static void tunrename(void *arg, struct ifnet *ifp); 231 static int tunifioctl(struct ifnet *, u_long, caddr_t); 232 static void tuninit(struct ifnet *); 233 static void tunifinit(void *xtp); 234 static int tuntapmodevent(module_t, int, void *); 235 static int tunoutput(struct ifnet *, struct mbuf *, 236 const struct sockaddr *, struct route *ro); 237 static void tunstart(struct ifnet *); 238 static void tunstart_l2(struct ifnet *); 239 240 static int tun_clone_match(struct if_clone *ifc, const char *name); 241 static int tap_clone_match(struct if_clone *ifc, const char *name); 242 static int vmnet_clone_match(struct if_clone *ifc, const char *name); 243 static int tun_clone_create(struct if_clone *, char *, size_t, 244 struct ifc_data *, struct ifnet **); 245 static int tun_clone_destroy(struct if_clone *, struct ifnet *, uint32_t); 246 static void tun_vnethdr_set(struct ifnet *ifp, int vhdrlen); 247 248 static d_open_t tunopen; 249 static d_read_t tunread; 250 static d_write_t tunwrite; 251 static d_ioctl_t tunioctl; 252 static d_poll_t tunpoll; 253 static d_kqfilter_t tunkqfilter; 254 255 static int tunkqread(struct knote *, long); 256 static int tunkqwrite(struct knote *, long); 257 static void tunkqdetach(struct knote *); 258 259 static const struct filterops tun_read_filterops = { 260 .f_isfd = 1, 261 .f_attach = NULL, 262 .f_detach = tunkqdetach, 263 .f_event = tunkqread, 264 }; 265 266 static const struct filterops tun_write_filterops = { 267 .f_isfd = 1, 268 .f_attach = NULL, 269 .f_detach = tunkqdetach, 270 .f_event = tunkqwrite, 271 }; 272 273 static struct tuntap_driver { 274 struct cdevsw cdevsw; 275 int ident_flags; 276 struct unrhdr *unrhdr; 277 struct clonedevs *clones; 278 ifc_match_f *clone_match_fn; 279 ifc_create_f *clone_create_fn; 280 ifc_destroy_f *clone_destroy_fn; 281 } tuntap_drivers[] = { 282 { 283 .ident_flags = 0, 284 .cdevsw = { 285 .d_version = D_VERSION, 286 .d_flags = D_NEEDMINOR, 287 .d_open = tunopen, 288 .d_read = tunread, 289 .d_write = tunwrite, 290 .d_ioctl = tunioctl, 291 .d_poll = tunpoll, 292 .d_kqfilter = tunkqfilter, 293 .d_name = tunname, 294 }, 295 .clone_match_fn = tun_clone_match, 296 .clone_create_fn = tun_clone_create, 297 .clone_destroy_fn = tun_clone_destroy, 298 }, 299 { 300 .ident_flags = TUN_L2, 301 .cdevsw = { 302 .d_version = D_VERSION, 303 .d_flags = D_NEEDMINOR, 304 .d_open = tunopen, 305 .d_read = tunread, 306 .d_write = tunwrite, 307 .d_ioctl = tunioctl, 308 .d_poll = tunpoll, 309 .d_kqfilter = tunkqfilter, 310 .d_name = tapname, 311 }, 312 .clone_match_fn = tap_clone_match, 313 .clone_create_fn = tun_clone_create, 314 .clone_destroy_fn = tun_clone_destroy, 315 }, 316 { 317 .ident_flags = TUN_L2 | TUN_VMNET, 318 .cdevsw = { 319 .d_version = D_VERSION, 320 .d_flags = D_NEEDMINOR, 321 .d_open = tunopen, 322 .d_read = tunread, 323 .d_write = tunwrite, 324 .d_ioctl = tunioctl, 325 .d_poll = tunpoll, 326 .d_kqfilter = tunkqfilter, 327 .d_name = vmnetname, 328 }, 329 .clone_match_fn = vmnet_clone_match, 330 .clone_create_fn = tun_clone_create, 331 .clone_destroy_fn = tun_clone_destroy, 332 }, 333 }; 334 #define NDRV nitems(tuntap_drivers) 335 336 VNET_DEFINE_STATIC(struct if_clone *, tuntap_driver_cloners[NDRV]); 337 #define V_tuntap_driver_cloners VNET(tuntap_driver_cloners) 338 339 /* 340 * Mechanism for marking a tunnel device as busy so that we can safely do some 341 * orthogonal operations (such as operations on devices) without racing against 342 * tun_destroy. tun_destroy will wait on the condvar if we're at all busy or 343 * open, to be woken up when the condition is alleviated. 344 */ 345 static int 346 tun_busy_locked(struct tuntap_softc *tp) 347 { 348 349 TUN_LOCK_ASSERT(tp); 350 if ((tp->tun_flags & TUN_DYING) != 0) { 351 /* 352 * Perhaps unintuitive, but the device is busy going away. 353 * Other interpretations of EBUSY from tun_busy make little 354 * sense, since making a busy device even more busy doesn't 355 * sound like a problem. 356 */ 357 return (EBUSY); 358 } 359 360 ++tp->tun_busy; 361 return (0); 362 } 363 364 static void 365 tun_unbusy_locked(struct tuntap_softc *tp) 366 { 367 368 TUN_LOCK_ASSERT(tp); 369 KASSERT(tp->tun_busy != 0, ("tun_unbusy: called for non-busy tunnel")); 370 371 --tp->tun_busy; 372 /* Wake up anything that may be waiting on our busy tunnel. */ 373 if (tp->tun_busy == 0) 374 cv_broadcast(&tp->tun_cv); 375 } 376 377 static int 378 tun_busy(struct tuntap_softc *tp) 379 { 380 int ret; 381 382 TUN_LOCK(tp); 383 ret = tun_busy_locked(tp); 384 TUN_UNLOCK(tp); 385 return (ret); 386 } 387 388 static void 389 tun_unbusy(struct tuntap_softc *tp) 390 { 391 392 TUN_LOCK(tp); 393 tun_unbusy_locked(tp); 394 TUN_UNLOCK(tp); 395 } 396 397 /* 398 * Sets unit and/or flags given the device name. Must be called with correct 399 * vnet context. 400 */ 401 static int 402 tuntap_name2info(const char *name, int *outunit, int *outflags) 403 { 404 struct tuntap_driver *drv; 405 char *dname; 406 int flags, unit; 407 bool found; 408 409 if (name == NULL) 410 return (EINVAL); 411 412 /* 413 * Needed for dev_stdclone, but dev_stdclone will not modify, it just 414 * wants to be able to pass back a char * through the second param. We 415 * will always set that as NULL here, so we'll fake it. 416 */ 417 dname = __DECONST(char *, name); 418 found = false; 419 420 for (u_int i = 0; i < NDRV; i++) { 421 drv = &tuntap_drivers[i]; 422 423 if (strcmp(name, drv->cdevsw.d_name) == 0) { 424 found = true; 425 unit = -1; 426 flags = drv->ident_flags; 427 break; 428 } 429 430 if (dev_stdclone(dname, NULL, drv->cdevsw.d_name, &unit) == 1) { 431 found = true; 432 flags = drv->ident_flags; 433 break; 434 } 435 } 436 437 if (!found) 438 return (ENXIO); 439 440 if (outunit != NULL) 441 *outunit = unit; 442 if (outflags != NULL) 443 *outflags = flags; 444 return (0); 445 } 446 447 static struct if_clone * 448 tuntap_cloner_from_flags(int tun_flags) 449 { 450 451 for (u_int i = 0; i < NDRV; i++) 452 if ((tun_flags & TUN_DRIVER_IDENT_MASK) == 453 tuntap_drivers[i].ident_flags) 454 return (V_tuntap_driver_cloners[i]); 455 456 return (NULL); 457 } 458 459 /* 460 * Get driver information from a set of flags specified. Masks the identifying 461 * part of the flags and compares it against all of the available 462 * tuntap_drivers. 463 */ 464 static struct tuntap_driver * 465 tuntap_driver_from_flags(int tun_flags) 466 { 467 468 for (u_int i = 0; i < NDRV; i++) 469 if ((tun_flags & TUN_DRIVER_IDENT_MASK) == 470 tuntap_drivers[i].ident_flags) 471 return (&tuntap_drivers[i]); 472 473 return (NULL); 474 } 475 476 static int 477 tun_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) == 0) 483 return (1); 484 } 485 486 return (0); 487 } 488 489 static int 490 tap_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_L2 | TUN_VMNET)) == TUN_L2) 496 return (1); 497 } 498 499 return (0); 500 } 501 502 static int 503 vmnet_clone_match(struct if_clone *ifc, const char *name) 504 { 505 int tunflags; 506 507 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 508 if ((tunflags & TUN_VMNET) != 0) 509 return (1); 510 } 511 512 return (0); 513 } 514 515 /* 516 * Create a clone via the ifnet cloning mechanism. Note that this is invoked 517 * indirectly by tunclone() below. 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 struct tuntap_softc *tp; 555 556 tuncreate(dev); 557 tp = dev->si_drv1; 558 *ifpp = tp->tun_ifp; 559 } 560 561 return (i); 562 } 563 564 /* 565 * Create a clone via devfs access. 566 */ 567 static void 568 tunclone(void *arg, struct ucred *cred, char *name, int namelen, 569 struct cdev **dev) 570 { 571 char devname[SPECNAMELEN + 1]; 572 struct tuntap_driver *drv; 573 int append_unit, i, u, tunflags; 574 bool mayclone; 575 576 if (*dev != NULL) 577 return; 578 579 tunflags = 0; 580 CURVNET_SET(CRED_TO_VNET(cred)); 581 if (tuntap_name2info(name, &u, &tunflags) != 0) 582 goto out; /* Not recognized */ 583 584 if (u != -1 && u > IF_MAXUNIT) 585 goto out; /* Unit number too high */ 586 587 mayclone = priv_check_cred(cred, PRIV_NET_IFCREATE) == 0; 588 if ((tunflags & TUN_L2) != 0) { 589 /* tap/vmnet allow user open with a sysctl */ 590 mayclone = (mayclone || tap_allow_uopen) && tapdclone; 591 } else { 592 mayclone = mayclone && tundclone; 593 } 594 595 /* 596 * If tun cloning is enabled, only the superuser can create an 597 * interface. 598 */ 599 if (!mayclone) 600 goto out; 601 602 if (u == -1) 603 append_unit = 1; 604 else 605 append_unit = 0; 606 607 drv = tuntap_driver_from_flags(tunflags); 608 if (drv == NULL) 609 goto out; 610 611 /* find any existing device, or allocate new unit number */ 612 i = clone_create(&drv->clones, &drv->cdevsw, &u, dev, 0); 613 if (i) { 614 if (append_unit) { 615 namelen = snprintf(devname, sizeof(devname), "%s%d", 616 name, u); 617 name = devname; 618 } 619 620 i = tun_create_device(drv, u, cred, dev, name); 621 } else { 622 /* Consumed by the dev_clone invoker. */ 623 dev_ref(*dev); 624 } 625 if (i == 0) 626 if_clone_create(name, namelen, NULL); 627 out: 628 CURVNET_RESTORE(); 629 } 630 631 static int 632 tun_destroy(struct tuntap_softc *tp, bool may_intr) 633 { 634 int error; 635 636 TUN_LOCK(tp); 637 638 /* 639 * Transient tunnels may have set TUN_DYING if we're being destroyed as 640 * a result of the last close, which we'll allow. 641 */ 642 MPASS((tp->tun_flags & (TUN_DYING | TUN_TRANSIENT)) != TUN_DYING); 643 tp->tun_flags |= TUN_DYING; 644 error = 0; 645 while (tp->tun_busy != 0) { 646 if (may_intr) 647 error = cv_wait_sig(&tp->tun_cv, &tp->tun_mtx); 648 else 649 cv_wait(&tp->tun_cv, &tp->tun_mtx); 650 if (error != 0) { 651 tp->tun_flags &= ~TUN_DYING; 652 TUN_UNLOCK(tp); 653 return (error); 654 } 655 } 656 TUN_UNLOCK(tp); 657 658 CURVNET_SET(TUN2IFP(tp)->if_vnet); 659 660 mtx_lock(&tunmtx); 661 TAILQ_REMOVE(&tunhead, tp, tun_list); 662 mtx_unlock(&tunmtx); 663 664 /* destroy_dev will take care of any alias. */ 665 destroy_dev(tp->tun_dev); 666 seldrain(&tp->tun_rsel); 667 knlist_clear(&tp->tun_rsel.si_note, 0); 668 knlist_destroy(&tp->tun_rsel.si_note); 669 if ((tp->tun_flags & TUN_L2) != 0) { 670 ether_ifdetach(TUN2IFP(tp)); 671 } else { 672 bpfdetach(TUN2IFP(tp)); 673 if_detach(TUN2IFP(tp)); 674 } 675 sx_xlock(&tun_ioctl_sx); 676 TUN2IFP(tp)->if_softc = NULL; 677 sx_xunlock(&tun_ioctl_sx); 678 free_unr(tp->tun_drv->unrhdr, TUN2IFP(tp)->if_dunit); 679 if_free(TUN2IFP(tp)); 680 mtx_destroy(&tp->tun_mtx); 681 cv_destroy(&tp->tun_cv); 682 free(tp, M_TUN); 683 CURVNET_RESTORE(); 684 685 return (0); 686 } 687 688 static int 689 tun_clone_destroy(struct if_clone *ifc __unused, struct ifnet *ifp, uint32_t flags) 690 { 691 struct tuntap_softc *tp = ifp->if_softc; 692 693 return (tun_destroy(tp, true)); 694 } 695 696 static void 697 vnet_tun_init(const void *unused __unused) 698 { 699 700 for (u_int i = 0; i < NDRV; ++i) { 701 struct if_clone_addreq req = { 702 .match_f = tuntap_drivers[i].clone_match_fn, 703 .create_f = tuntap_drivers[i].clone_create_fn, 704 .destroy_f = tuntap_drivers[i].clone_destroy_fn, 705 }; 706 V_tuntap_driver_cloners[i] = 707 ifc_attach_cloner(tuntap_drivers[i].cdevsw.d_name, &req); 708 }; 709 } 710 VNET_SYSINIT(vnet_tun_init, SI_SUB_PROTO_IF, SI_ORDER_ANY, 711 vnet_tun_init, NULL); 712 713 static void 714 tun_uninit(const void *unused __unused) 715 { 716 struct tuntap_driver *drv; 717 struct tuntap_softc *tp; 718 int i; 719 720 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, arrival_tag); 721 EVENTHANDLER_DEREGISTER(dev_clone, clone_tag); 722 723 CURVNET_SET(vnet0); 724 for (u_int i = 0; i < NDRV; i++) { 725 if_clone_detach(V_tuntap_driver_cloners[i]); 726 V_tuntap_driver_cloners[i] = NULL; 727 } 728 CURVNET_RESTORE(); 729 730 if (tuntap_osd_jail_slot != 0) 731 osd_jail_deregister(tuntap_osd_jail_slot); 732 733 mtx_lock(&tunmtx); 734 while ((tp = TAILQ_FIRST(&tunhead)) != NULL) { 735 mtx_unlock(&tunmtx); 736 /* tun_destroy() will remove it from the tailq. */ 737 tun_destroy(tp, false); 738 mtx_lock(&tunmtx); 739 } 740 mtx_unlock(&tunmtx); 741 for (i = 0; i < nitems(tuntap_drivers); ++i) { 742 drv = &tuntap_drivers[i]; 743 delete_unrhdr(drv->unrhdr); 744 clone_cleanup(&drv->clones); 745 } 746 mtx_destroy(&tunmtx); 747 } 748 SYSUNINIT(tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY, tun_uninit, NULL); 749 750 static struct tuntap_driver * 751 tuntap_driver_from_ifnet(const struct ifnet *ifp) 752 { 753 struct tuntap_driver *drv; 754 int i; 755 756 if (ifp == NULL) 757 return (NULL); 758 759 for (i = 0; i < nitems(tuntap_drivers); ++i) { 760 drv = &tuntap_drivers[i]; 761 if (strcmp(ifp->if_dname, drv->cdevsw.d_name) == 0) 762 return (drv); 763 } 764 765 return (NULL); 766 } 767 768 /* 769 * Remove devices that were created by devfs cloning, as they hold references 770 * which prevent the prison from collapsing, in which state VNET sysuninits will 771 * not be invoked. 772 */ 773 static int 774 tuntap_prison_remove(void *obj, void *data __unused) 775 { 776 #ifdef VIMAGE 777 struct prison *pr; 778 779 pr = obj; 780 if (prison_owns_vnet(pr)) { 781 CURVNET_SET(pr->pr_vnet); 782 for (u_int i = 0; i < NDRV; i++) { 783 if_clone_detach(V_tuntap_driver_cloners[i]); 784 V_tuntap_driver_cloners[i] = NULL; 785 } 786 CURVNET_RESTORE(); 787 } 788 #endif 789 return (0); 790 } 791 792 static int 793 tuntapmodevent(module_t mod, int type, void *data) 794 { 795 struct tuntap_driver *drv; 796 int i; 797 798 switch (type) { 799 case MOD_LOAD: 800 mtx_init(&tunmtx, "tunmtx", NULL, MTX_DEF); 801 for (i = 0; i < nitems(tuntap_drivers); ++i) { 802 drv = &tuntap_drivers[i]; 803 clone_setup(&drv->clones); 804 drv->unrhdr = new_unrhdr(0, IF_MAXUNIT, &tunmtx); 805 } 806 osd_method_t methods[PR_MAXMETHOD] = { 807 [PR_METHOD_REMOVE] = tuntap_prison_remove, 808 }; 809 tuntap_osd_jail_slot = osd_jail_register(NULL, methods); 810 arrival_tag = EVENTHANDLER_REGISTER(ifnet_arrival_event, 811 tunrename, 0, 1000); 812 if (arrival_tag == NULL) 813 return (ENOMEM); 814 clone_tag = EVENTHANDLER_REGISTER(dev_clone, tunclone, 0, 1000); 815 if (clone_tag == NULL) 816 return (ENOMEM); 817 break; 818 case MOD_UNLOAD: 819 /* See tun_uninit(). */ 820 break; 821 default: 822 return EOPNOTSUPP; 823 } 824 return 0; 825 } 826 827 static moduledata_t tuntap_mod = { 828 "if_tuntap", 829 tuntapmodevent, 830 0 831 }; 832 833 /* We'll only ever have these two, so no need for a macro. */ 834 static moduledata_t tun_mod = { "if_tun", NULL, 0 }; 835 static moduledata_t tap_mod = { "if_tap", NULL, 0 }; 836 837 DECLARE_MODULE(if_tuntap, tuntap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 838 MODULE_VERSION(if_tuntap, 1); 839 DECLARE_MODULE(if_tun, tun_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 840 MODULE_VERSION(if_tun, 1); 841 DECLARE_MODULE(if_tap, tap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 842 MODULE_VERSION(if_tap, 1); 843 844 static int 845 tun_create_device(struct tuntap_driver *drv, int unit, struct ucred *cr, 846 struct cdev **dev, const char *name) 847 { 848 struct make_dev_args args; 849 struct tuntap_softc *tp; 850 int error; 851 852 tp = malloc(sizeof(*tp), M_TUN, M_WAITOK | M_ZERO); 853 mtx_init(&tp->tun_mtx, "tun_mtx", NULL, MTX_DEF); 854 cv_init(&tp->tun_cv, "tun_condvar"); 855 tp->tun_flags = drv->ident_flags; 856 tp->tun_drv = drv; 857 858 make_dev_args_init(&args); 859 if (cr != NULL) 860 args.mda_flags = MAKEDEV_REF | MAKEDEV_CHECKNAME; 861 args.mda_devsw = &drv->cdevsw; 862 args.mda_cr = cr; 863 args.mda_uid = UID_UUCP; 864 args.mda_gid = GID_DIALER; 865 args.mda_mode = 0600; 866 args.mda_unit = unit; 867 args.mda_si_drv1 = tp; 868 error = make_dev_s(&args, dev, "%s", name); 869 if (error != 0) { 870 mtx_destroy(&tp->tun_mtx); 871 cv_destroy(&tp->tun_cv); 872 free(tp, M_TUN); 873 return (error); 874 } 875 876 KASSERT((*dev)->si_drv1 != NULL, 877 ("Failed to set si_drv1 at %s creation", name)); 878 tp->tun_dev = *dev; 879 knlist_init_mtx(&tp->tun_rsel.si_note, &tp->tun_mtx); 880 mtx_lock(&tunmtx); 881 TAILQ_INSERT_TAIL(&tunhead, tp, tun_list); 882 mtx_unlock(&tunmtx); 883 return (0); 884 } 885 886 static void 887 tunstart(struct ifnet *ifp) 888 { 889 struct tuntap_softc *tp = ifp->if_softc; 890 struct mbuf *m; 891 892 TUNDEBUG(ifp, "starting\n"); 893 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 894 IFQ_LOCK(&ifp->if_snd); 895 IFQ_POLL_NOLOCK(&ifp->if_snd, m); 896 if (m == NULL) { 897 IFQ_UNLOCK(&ifp->if_snd); 898 return; 899 } 900 IFQ_UNLOCK(&ifp->if_snd); 901 } 902 903 TUN_LOCK(tp); 904 if (tp->tun_flags & TUN_RWAIT) { 905 tp->tun_flags &= ~TUN_RWAIT; 906 wakeup(tp); 907 } 908 selwakeuppri(&tp->tun_rsel, PZERO); 909 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 910 if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio) { 911 TUN_UNLOCK(tp); 912 pgsigio(&tp->tun_sigio, SIGIO, 0); 913 } else 914 TUN_UNLOCK(tp); 915 } 916 917 /* 918 * tunstart_l2 919 * 920 * queue packets from higher level ready to put out 921 */ 922 static void 923 tunstart_l2(struct ifnet *ifp) 924 { 925 struct tuntap_softc *tp = ifp->if_softc; 926 927 TUNDEBUG(ifp, "starting\n"); 928 929 /* 930 * do not junk pending output if we are in VMnet mode. 931 * XXX: can this do any harm because of queue overflow? 932 */ 933 934 TUN_LOCK(tp); 935 if (((tp->tun_flags & TUN_VMNET) == 0) && 936 ((tp->tun_flags & TUN_READY) != TUN_READY)) { 937 struct mbuf *m; 938 939 /* Unlocked read. */ 940 TUNDEBUG(ifp, "not ready, tun_flags = 0x%x\n", tp->tun_flags); 941 942 for (;;) { 943 IF_DEQUEUE(&ifp->if_snd, m); 944 if (m != NULL) { 945 m_freem(m); 946 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 947 } else 948 break; 949 } 950 TUN_UNLOCK(tp); 951 952 return; 953 } 954 955 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 956 957 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 958 if (tp->tun_flags & TUN_RWAIT) { 959 tp->tun_flags &= ~TUN_RWAIT; 960 wakeup(tp); 961 } 962 963 if ((tp->tun_flags & TUN_ASYNC) && (tp->tun_sigio != NULL)) { 964 TUN_UNLOCK(tp); 965 pgsigio(&tp->tun_sigio, SIGIO, 0); 966 TUN_LOCK(tp); 967 } 968 969 selwakeuppri(&tp->tun_rsel, PZERO); 970 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 971 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); /* obytes are counted in ether_output */ 972 } 973 974 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 975 TUN_UNLOCK(tp); 976 } /* tunstart_l2 */ 977 978 static int 979 tap_transmit(struct ifnet *ifp, struct mbuf *m) 980 { 981 int error; 982 983 BPF_MTAP(ifp, m); 984 IFQ_HANDOFF(ifp, m, error); 985 return (error); 986 } 987 988 static void 989 tuncreate(struct cdev *dev) 990 { 991 struct tuntap_driver *drv; 992 struct tuntap_softc *tp; 993 struct ifnet *ifp; 994 struct ether_addr eaddr; 995 int iflags; 996 u_char type; 997 998 tp = dev->si_drv1; 999 KASSERT(tp != NULL, 1000 ("si_drv1 should have been initialized at creation")); 1001 1002 drv = tp->tun_drv; 1003 iflags = IFF_MULTICAST; 1004 if ((tp->tun_flags & TUN_L2) != 0) { 1005 type = IFT_ETHER; 1006 iflags |= IFF_BROADCAST | IFF_SIMPLEX; 1007 } else { 1008 type = IFT_PPP; 1009 iflags |= IFF_POINTOPOINT; 1010 } 1011 ifp = tp->tun_ifp = if_alloc(type); 1012 ifp->if_softc = tp; 1013 if_initname(ifp, drv->cdevsw.d_name, dev2unit(dev)); 1014 ifp->if_ioctl = tunifioctl; 1015 ifp->if_flags = iflags; 1016 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 1017 ifp->if_capabilities |= IFCAP_LINKSTATE | IFCAP_MEXTPG; 1018 if ((tp->tun_flags & TUN_L2) != 0) 1019 ifp->if_capabilities |= 1020 IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO; 1021 ifp->if_capenable |= IFCAP_LINKSTATE | IFCAP_MEXTPG; 1022 1023 if ((tp->tun_flags & TUN_L2) != 0) { 1024 ifp->if_init = tunifinit; 1025 ifp->if_start = tunstart_l2; 1026 ifp->if_transmit = tap_transmit; 1027 ifp->if_qflush = if_qflush; 1028 1029 ether_gen_addr(ifp, &eaddr); 1030 ether_ifattach(ifp, eaddr.octet); 1031 } else { 1032 ifp->if_mtu = TUNMTU; 1033 ifp->if_start = tunstart; 1034 ifp->if_output = tunoutput; 1035 1036 ifp->if_snd.ifq_drv_maxlen = 0; 1037 IFQ_SET_READY(&ifp->if_snd); 1038 1039 if_attach(ifp); 1040 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 1041 } 1042 1043 TUN_LOCK(tp); 1044 tp->tun_flags |= TUN_INITED; 1045 TUN_UNLOCK(tp); 1046 1047 TUNDEBUG(ifp, "interface %s is created, minor = %#x\n", 1048 ifp->if_xname, dev2unit(dev)); 1049 } 1050 1051 static void 1052 tunrename(void *arg __unused, struct ifnet *ifp) 1053 { 1054 struct tuntap_softc *tp; 1055 int error; 1056 1057 if ((ifp->if_flags & IFF_RENAMING) == 0) 1058 return; 1059 1060 if (tuntap_driver_from_ifnet(ifp) == NULL) 1061 return; 1062 1063 /* 1064 * We need to grab the ioctl sx long enough to make sure the softc is 1065 * still there. If it is, we can safely try to busy the tun device. 1066 * The busy may fail if the device is currently dying, in which case 1067 * we do nothing. If it doesn't fail, the busy count stops the device 1068 * from dying until we've created the alias (that will then be 1069 * subsequently destroyed). 1070 */ 1071 sx_xlock(&tun_ioctl_sx); 1072 tp = ifp->if_softc; 1073 if (tp == NULL) { 1074 sx_xunlock(&tun_ioctl_sx); 1075 return; 1076 } 1077 error = tun_busy(tp); 1078 sx_xunlock(&tun_ioctl_sx); 1079 if (error != 0) 1080 return; 1081 if (tp->tun_alias != NULL) { 1082 destroy_dev(tp->tun_alias); 1083 tp->tun_alias = NULL; 1084 } 1085 1086 if (strcmp(ifp->if_xname, tp->tun_dev->si_name) == 0) 1087 goto out; 1088 1089 /* 1090 * Failure's ok, aliases are created on a best effort basis. If a 1091 * tun user/consumer decides to rename the interface to conflict with 1092 * another device (non-ifnet) on the system, we will assume they know 1093 * what they are doing. make_dev_alias_p won't touch tun_alias on 1094 * failure, so we use it but ignore the return value. 1095 */ 1096 make_dev_alias_p(MAKEDEV_CHECKNAME, &tp->tun_alias, tp->tun_dev, "%s", 1097 ifp->if_xname); 1098 out: 1099 tun_unbusy(tp); 1100 } 1101 1102 static int 1103 tunopen(struct cdev *dev, int flag, int mode, struct thread *td) 1104 { 1105 struct ifnet *ifp; 1106 struct tuntap_softc *tp; 1107 int error __diagused, tunflags; 1108 1109 tunflags = 0; 1110 CURVNET_SET(TD_TO_VNET(td)); 1111 error = tuntap_name2info(dev->si_name, NULL, &tunflags); 1112 if (error != 0) { 1113 CURVNET_RESTORE(); 1114 return (error); /* Shouldn't happen */ 1115 } 1116 1117 tp = dev->si_drv1; 1118 KASSERT(tp != NULL, 1119 ("si_drv1 should have been initialized at creation")); 1120 1121 TUN_LOCK(tp); 1122 if ((tp->tun_flags & TUN_INITED) == 0) { 1123 TUN_UNLOCK(tp); 1124 CURVNET_RESTORE(); 1125 return (ENXIO); 1126 } 1127 if ((tp->tun_flags & (TUN_OPEN | TUN_DYING)) != 0) { 1128 TUN_UNLOCK(tp); 1129 CURVNET_RESTORE(); 1130 return (EBUSY); 1131 } 1132 1133 error = tun_busy_locked(tp); 1134 KASSERT(error == 0, ("Must be able to busy an unopen tunnel")); 1135 ifp = TUN2IFP(tp); 1136 1137 if ((tp->tun_flags & TUN_L2) != 0) { 1138 bcopy(IF_LLADDR(ifp), tp->tun_ether.octet, 1139 sizeof(tp->tun_ether.octet)); 1140 1141 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1142 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1143 1144 if (tapuponopen) 1145 ifp->if_flags |= IFF_UP; 1146 } 1147 1148 tp->tun_pid = td->td_proc->p_pid; 1149 tp->tun_flags |= TUN_OPEN; 1150 1151 if_link_state_change(ifp, LINK_STATE_UP); 1152 TUNDEBUG(ifp, "open\n"); 1153 TUN_UNLOCK(tp); 1154 1155 /* 1156 * This can fail with either ENOENT or EBUSY. This is in the middle of 1157 * d_open, so ENOENT should not be possible. EBUSY is possible, but 1158 * the only cdevpriv dtor being set will be tundtor and the softc being 1159 * passed is constant for a given cdev. We ignore the possible error 1160 * because of this as either "unlikely" or "not actually a problem." 1161 */ 1162 (void)devfs_set_cdevpriv(tp, tundtor); 1163 CURVNET_RESTORE(); 1164 return (0); 1165 } 1166 1167 /* 1168 * tundtor - tear down the device - mark i/f down & delete 1169 * routing info 1170 */ 1171 static void 1172 tundtor(void *data) 1173 { 1174 struct proc *p; 1175 struct tuntap_softc *tp; 1176 struct ifnet *ifp; 1177 bool l2tun; 1178 1179 tp = data; 1180 p = curproc; 1181 ifp = TUN2IFP(tp); 1182 1183 TUN_LOCK(tp); 1184 1185 /* 1186 * Realistically, we can't be obstinate here. This only means that the 1187 * tuntap device was closed out of order, and the last closer wasn't the 1188 * controller. These are still good to know about, though, as software 1189 * should avoid multiple processes with a tuntap device open and 1190 * ill-defined transfer of control (e.g., handoff, TUNSIFPID, close in 1191 * parent). 1192 */ 1193 if (p->p_pid != tp->tun_pid) { 1194 log(LOG_INFO, 1195 "pid %d (%s), %s: tun/tap protocol violation, non-controlling process closed last.\n", 1196 p->p_pid, p->p_comm, tp->tun_dev->si_name); 1197 } 1198 1199 /* 1200 * junk all pending output 1201 */ 1202 CURVNET_SET(ifp->if_vnet); 1203 1204 l2tun = false; 1205 if ((tp->tun_flags & TUN_L2) != 0) { 1206 l2tun = true; 1207 IF_DRAIN(&ifp->if_snd); 1208 } else { 1209 IFQ_PURGE(&ifp->if_snd); 1210 } 1211 1212 /* For vmnet, we won't do most of the address/route bits */ 1213 if ((tp->tun_flags & TUN_VMNET) != 0 || 1214 (l2tun && (ifp->if_flags & IFF_LINK0) != 0)) 1215 goto out; 1216 #if defined(INET) || defined(INET6) 1217 if (l2tun && tp->tun_lro_ready) { 1218 TUNDEBUG (ifp, "LRO disabled\n"); 1219 tcp_lro_free(&tp->tun_lro); 1220 tp->tun_lro_ready = false; 1221 } 1222 #endif 1223 if (ifp->if_flags & IFF_UP) { 1224 TUN_UNLOCK(tp); 1225 if_down(ifp); 1226 TUN_LOCK(tp); 1227 } 1228 1229 /* Delete all addresses and routes which reference this interface. */ 1230 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1231 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1232 TUN_UNLOCK(tp); 1233 if_purgeaddrs(ifp); 1234 TUN_LOCK(tp); 1235 } 1236 1237 out: 1238 if_link_state_change(ifp, LINK_STATE_DOWN); 1239 CURVNET_RESTORE(); 1240 1241 funsetown(&tp->tun_sigio); 1242 selwakeuppri(&tp->tun_rsel, PZERO); 1243 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 1244 TUNDEBUG (ifp, "closed\n"); 1245 tp->tun_flags &= ~TUN_OPEN; 1246 tp->tun_pid = 0; 1247 tun_vnethdr_set(ifp, 0); 1248 1249 tun_unbusy_locked(tp); 1250 if ((tp->tun_flags & TUN_TRANSIENT) != 0) { 1251 struct if_clone *cloner; 1252 int error __diagused; 1253 1254 /* Mark it busy so that nothing can re-open it. */ 1255 tp->tun_flags |= TUN_DYING; 1256 TUN_UNLOCK(tp); 1257 1258 CURVNET_SET_QUIET(ifp->if_home_vnet); 1259 cloner = tuntap_cloner_from_flags(tp->tun_flags); 1260 CURVNET_RESTORE(); 1261 1262 error = if_clone_destroyif(cloner, ifp); 1263 MPASS(error == 0 || error == EINTR || error == ERESTART); 1264 return; 1265 } 1266 1267 TUN_UNLOCK(tp); 1268 } 1269 1270 static void 1271 tuninit(struct ifnet *ifp) 1272 { 1273 struct tuntap_softc *tp = ifp->if_softc; 1274 1275 TUNDEBUG(ifp, "tuninit\n"); 1276 1277 TUN_LOCK(tp); 1278 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1279 if ((tp->tun_flags & TUN_L2) == 0) { 1280 ifp->if_flags |= IFF_UP; 1281 getmicrotime(&ifp->if_lastchange); 1282 TUN_UNLOCK(tp); 1283 } else { 1284 #if defined(INET) || defined(INET6) 1285 if (tcp_lro_init(&tp->tun_lro) == 0) { 1286 TUNDEBUG(ifp, "LRO enabled\n"); 1287 tp->tun_lro.ifp = ifp; 1288 tp->tun_lro_ready = true; 1289 } else { 1290 TUNDEBUG(ifp, "Could not enable LRO\n"); 1291 tp->tun_lro_ready = false; 1292 } 1293 #endif 1294 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1295 TUN_UNLOCK(tp); 1296 /* attempt to start output */ 1297 tunstart_l2(ifp); 1298 } 1299 1300 } 1301 1302 /* 1303 * Used only for l2 tunnel. 1304 */ 1305 static void 1306 tunifinit(void *xtp) 1307 { 1308 struct tuntap_softc *tp; 1309 1310 tp = (struct tuntap_softc *)xtp; 1311 tuninit(tp->tun_ifp); 1312 } 1313 1314 /* 1315 * To be called under TUN_LOCK. Update ifp->if_hwassist according to the 1316 * current value of ifp->if_capenable. 1317 */ 1318 static void 1319 tun_caps_changed(struct ifnet *ifp) 1320 { 1321 uint64_t hwassist = 0; 1322 1323 TUN_LOCK_ASSERT((struct tuntap_softc *)ifp->if_softc); 1324 if (ifp->if_capenable & IFCAP_TXCSUM) 1325 hwassist |= CSUM_TCP | CSUM_UDP; 1326 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) 1327 hwassist |= CSUM_TCP_IPV6 1328 | CSUM_UDP_IPV6; 1329 if (ifp->if_capenable & IFCAP_TSO4) 1330 hwassist |= CSUM_IP_TSO; 1331 if (ifp->if_capenable & IFCAP_TSO6) 1332 hwassist |= CSUM_IP6_TSO; 1333 ifp->if_hwassist = hwassist; 1334 } 1335 1336 /* 1337 * To be called under TUN_LOCK. Update tp->tun_vhdrlen and adjust 1338 * if_capabilities and if_capenable as needed. 1339 */ 1340 static void 1341 tun_vnethdr_set(struct ifnet *ifp, int vhdrlen) 1342 { 1343 struct tuntap_softc *tp = ifp->if_softc; 1344 1345 TUN_LOCK_ASSERT(tp); 1346 1347 if (tp->tun_vhdrlen == vhdrlen) 1348 return; 1349 1350 /* 1351 * Update if_capabilities to reflect the 1352 * functionalities offered by the virtio-net 1353 * header. 1354 */ 1355 if (vhdrlen != 0) 1356 ifp->if_capabilities |= 1357 TAP_VNET_HDR_CAPS; 1358 else 1359 ifp->if_capabilities &= 1360 ~TAP_VNET_HDR_CAPS; 1361 /* 1362 * Disable any capabilities that we don't 1363 * support anymore. 1364 */ 1365 ifp->if_capenable &= ifp->if_capabilities; 1366 tun_caps_changed(ifp); 1367 tp->tun_vhdrlen = vhdrlen; 1368 1369 TUNDEBUG(ifp, "vnet_hdr_len=%d, if_capabilities=%x\n", 1370 vhdrlen, ifp->if_capabilities); 1371 } 1372 1373 /* 1374 * Process an ioctl request. 1375 */ 1376 static int 1377 tunifioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1378 { 1379 struct ifreq *ifr = (struct ifreq *)data; 1380 struct tuntap_softc *tp; 1381 struct ifstat *ifs; 1382 struct ifmediareq *ifmr; 1383 int dummy, error = 0; 1384 bool l2tun; 1385 1386 ifmr = NULL; 1387 sx_xlock(&tun_ioctl_sx); 1388 tp = ifp->if_softc; 1389 if (tp == NULL) { 1390 error = ENXIO; 1391 goto bad; 1392 } 1393 l2tun = (tp->tun_flags & TUN_L2) != 0; 1394 switch(cmd) { 1395 case SIOCGIFSTATUS: 1396 ifs = (struct ifstat *)data; 1397 TUN_LOCK(tp); 1398 if (tp->tun_pid) 1399 snprintf(ifs->ascii, sizeof(ifs->ascii), 1400 "\tOpened by PID %d\n", tp->tun_pid); 1401 else 1402 ifs->ascii[0] = '\0'; 1403 TUN_UNLOCK(tp); 1404 break; 1405 case SIOCSIFADDR: 1406 if (l2tun) 1407 error = ether_ioctl(ifp, cmd, data); 1408 else 1409 tuninit(ifp); 1410 if (error == 0) 1411 TUNDEBUG(ifp, "address set\n"); 1412 break; 1413 case SIOCSIFMTU: 1414 ifp->if_mtu = ifr->ifr_mtu; 1415 TUNDEBUG(ifp, "mtu set\n"); 1416 break; 1417 case SIOCSIFFLAGS: 1418 case SIOCADDMULTI: 1419 case SIOCDELMULTI: 1420 break; 1421 case SIOCGIFMEDIA: 1422 if (!l2tun) { 1423 error = EINVAL; 1424 break; 1425 } 1426 1427 ifmr = (struct ifmediareq *)data; 1428 dummy = ifmr->ifm_count; 1429 ifmr->ifm_count = 1; 1430 ifmr->ifm_status = IFM_AVALID; 1431 ifmr->ifm_active = IFM_ETHER | IFM_FDX | IFM_1000_T; 1432 if (tp->tun_flags & TUN_OPEN) 1433 ifmr->ifm_status |= IFM_ACTIVE; 1434 ifmr->ifm_current = ifmr->ifm_active; 1435 if (dummy >= 1) { 1436 int media = IFM_ETHER; 1437 error = copyout(&media, ifmr->ifm_ulist, sizeof(int)); 1438 } 1439 break; 1440 case SIOCSIFCAP: 1441 TUN_LOCK(tp); 1442 ifp->if_capenable = ifr->ifr_reqcap; 1443 tun_caps_changed(ifp); 1444 TUN_UNLOCK(tp); 1445 VLAN_CAPABILITIES(ifp); 1446 break; 1447 default: 1448 if (l2tun) { 1449 error = ether_ioctl(ifp, cmd, data); 1450 } else { 1451 error = EINVAL; 1452 } 1453 } 1454 bad: 1455 sx_xunlock(&tun_ioctl_sx); 1456 return (error); 1457 } 1458 1459 /* 1460 * tunoutput - queue packets from higher level ready to put out. 1461 */ 1462 static int 1463 tunoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 1464 struct route *ro) 1465 { 1466 struct tuntap_softc *tp = ifp->if_softc; 1467 u_short cached_tun_flags; 1468 int error; 1469 u_int32_t af; 1470 1471 TUNDEBUG (ifp, "tunoutput\n"); 1472 1473 #ifdef MAC 1474 error = mac_ifnet_check_transmit(ifp, m0); 1475 if (error) { 1476 m_freem(m0); 1477 return (error); 1478 } 1479 #endif 1480 1481 /* Could be unlocked read? */ 1482 TUN_LOCK(tp); 1483 cached_tun_flags = tp->tun_flags; 1484 TUN_UNLOCK(tp); 1485 if ((cached_tun_flags & TUN_READY) != TUN_READY) { 1486 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 1487 m_freem (m0); 1488 return (EHOSTDOWN); 1489 } 1490 1491 if ((ifp->if_flags & IFF_UP) != IFF_UP) { 1492 m_freem (m0); 1493 return (EHOSTDOWN); 1494 } 1495 1496 /* BPF writes need to be handled specially. */ 1497 if (dst->sa_family == AF_UNSPEC || dst->sa_family == pseudo_AF_HDRCMPLT) 1498 bcopy(dst->sa_data, &af, sizeof(af)); 1499 else 1500 af = RO_GET_FAMILY(ro, dst); 1501 1502 BPF_MTAP2(ifp, &af, sizeof(af), m0); 1503 1504 /* prepend sockaddr? this may abort if the mbuf allocation fails */ 1505 if (cached_tun_flags & TUN_LMODE) { 1506 /* allocate space for sockaddr */ 1507 M_PREPEND(m0, dst->sa_len, M_NOWAIT); 1508 1509 /* if allocation failed drop packet */ 1510 if (m0 == NULL) { 1511 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1); 1512 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 1513 return (ENOBUFS); 1514 } else { 1515 bcopy(dst, m0->m_data, dst->sa_len); 1516 } 1517 } 1518 1519 if (cached_tun_flags & TUN_IFHEAD) { 1520 /* Prepend the address family */ 1521 M_PREPEND(m0, 4, M_NOWAIT); 1522 1523 /* if allocation failed drop packet */ 1524 if (m0 == NULL) { 1525 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1); 1526 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 1527 return (ENOBUFS); 1528 } else 1529 *(u_int32_t *)m0->m_data = htonl(af); 1530 } else { 1531 #ifdef INET 1532 if (af != AF_INET) 1533 #endif 1534 { 1535 m_freem(m0); 1536 return (EAFNOSUPPORT); 1537 } 1538 } 1539 1540 error = (ifp->if_transmit)(ifp, m0); 1541 if (error) 1542 return (ENOBUFS); 1543 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 1544 return (0); 1545 } 1546 1547 /* 1548 * the cdevsw interface is now pretty minimal. 1549 */ 1550 static int 1551 tunioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, 1552 struct thread *td) 1553 { 1554 struct ifreq ifr, *ifrp; 1555 struct tuntap_softc *tp = dev->si_drv1; 1556 struct ifnet *ifp = TUN2IFP(tp); 1557 struct tuninfo *tunp; 1558 int error, iflags, ival; 1559 bool l2tun; 1560 1561 l2tun = (tp->tun_flags & TUN_L2) != 0; 1562 if (l2tun) { 1563 /* tap specific ioctls */ 1564 switch(cmd) { 1565 /* VMware/VMnet port ioctl's */ 1566 #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 1567 defined(COMPAT_FREEBSD4) 1568 case _IO('V', 0): 1569 ival = IOCPARM_IVAL(data); 1570 data = (caddr_t)&ival; 1571 /* FALLTHROUGH */ 1572 #endif 1573 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 1574 iflags = *(int *)data; 1575 iflags &= TUN_VMIO_FLAG_MASK; 1576 iflags &= ~IFF_CANTCHANGE; 1577 iflags |= IFF_UP; 1578 1579 TUN_LOCK(tp); 1580 ifp->if_flags = iflags | 1581 (ifp->if_flags & IFF_CANTCHANGE); 1582 TUN_UNLOCK(tp); 1583 1584 return (0); 1585 case SIOCGIFADDR: /* get MAC address of the remote side */ 1586 TUN_LOCK(tp); 1587 bcopy(&tp->tun_ether.octet, data, 1588 sizeof(tp->tun_ether.octet)); 1589 TUN_UNLOCK(tp); 1590 1591 return (0); 1592 case SIOCSIFADDR: /* set MAC address of the remote side */ 1593 TUN_LOCK(tp); 1594 bcopy(data, &tp->tun_ether.octet, 1595 sizeof(tp->tun_ether.octet)); 1596 TUN_UNLOCK(tp); 1597 1598 return (0); 1599 case TAPSVNETHDR: 1600 ival = *(int *)data; 1601 if (ival != 0 && 1602 ival != sizeof(struct virtio_net_hdr) && 1603 ival != sizeof(struct virtio_net_hdr_mrg_rxbuf)) { 1604 return (EINVAL); 1605 } 1606 TUN_LOCK(tp); 1607 tun_vnethdr_set(ifp, ival); 1608 TUN_UNLOCK(tp); 1609 1610 return (0); 1611 case TAPGVNETHDR: 1612 TUN_LOCK(tp); 1613 *(int *)data = tp->tun_vhdrlen; 1614 TUN_UNLOCK(tp); 1615 1616 return (0); 1617 } 1618 1619 /* Fall through to the common ioctls if unhandled */ 1620 } else { 1621 switch (cmd) { 1622 case TUNSLMODE: 1623 TUN_LOCK(tp); 1624 if (*(int *)data) { 1625 tp->tun_flags |= TUN_LMODE; 1626 tp->tun_flags &= ~TUN_IFHEAD; 1627 } else 1628 tp->tun_flags &= ~TUN_LMODE; 1629 TUN_UNLOCK(tp); 1630 1631 return (0); 1632 case TUNSIFHEAD: 1633 TUN_LOCK(tp); 1634 if (*(int *)data) { 1635 tp->tun_flags |= TUN_IFHEAD; 1636 tp->tun_flags &= ~TUN_LMODE; 1637 } else 1638 tp->tun_flags &= ~TUN_IFHEAD; 1639 TUN_UNLOCK(tp); 1640 1641 return (0); 1642 case TUNGIFHEAD: 1643 TUN_LOCK(tp); 1644 *(int *)data = (tp->tun_flags & TUN_IFHEAD) ? 1 : 0; 1645 TUN_UNLOCK(tp); 1646 1647 return (0); 1648 case TUNSIFMODE: 1649 /* deny this if UP */ 1650 if (TUN2IFP(tp)->if_flags & IFF_UP) 1651 return (EBUSY); 1652 1653 switch (*(int *)data & ~IFF_MULTICAST) { 1654 case IFF_POINTOPOINT: 1655 case IFF_BROADCAST: 1656 TUN_LOCK(tp); 1657 TUN2IFP(tp)->if_flags &= 1658 ~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST); 1659 TUN2IFP(tp)->if_flags |= *(int *)data; 1660 TUN_UNLOCK(tp); 1661 1662 break; 1663 default: 1664 return (EINVAL); 1665 } 1666 1667 return (0); 1668 case TUNSIFPID: 1669 TUN_LOCK(tp); 1670 tp->tun_pid = curthread->td_proc->p_pid; 1671 TUN_UNLOCK(tp); 1672 1673 return (0); 1674 } 1675 /* Fall through to the common ioctls if unhandled */ 1676 } 1677 1678 switch (cmd) { 1679 case TUNGIFNAME: 1680 ifrp = (struct ifreq *)data; 1681 strlcpy(ifrp->ifr_name, TUN2IFP(tp)->if_xname, IFNAMSIZ); 1682 1683 return (0); 1684 case TUNSIFINFO: 1685 tunp = (struct tuninfo *)data; 1686 if (TUN2IFP(tp)->if_type != tunp->type) 1687 return (EPROTOTYPE); 1688 TUN_LOCK(tp); 1689 if (TUN2IFP(tp)->if_mtu != tunp->mtu) { 1690 strlcpy(ifr.ifr_name, if_name(TUN2IFP(tp)), IFNAMSIZ); 1691 ifr.ifr_mtu = tunp->mtu; 1692 CURVNET_SET(TUN2IFP(tp)->if_vnet); 1693 error = ifhwioctl(SIOCSIFMTU, TUN2IFP(tp), 1694 (caddr_t)&ifr, td); 1695 CURVNET_RESTORE(); 1696 if (error) { 1697 TUN_UNLOCK(tp); 1698 return (error); 1699 } 1700 } 1701 TUN2IFP(tp)->if_baudrate = tunp->baudrate; 1702 TUN_UNLOCK(tp); 1703 break; 1704 case TUNGIFINFO: 1705 tunp = (struct tuninfo *)data; 1706 TUN_LOCK(tp); 1707 tunp->mtu = TUN2IFP(tp)->if_mtu; 1708 tunp->type = TUN2IFP(tp)->if_type; 1709 tunp->baudrate = TUN2IFP(tp)->if_baudrate; 1710 TUN_UNLOCK(tp); 1711 break; 1712 case TUNSDEBUG: 1713 tundebug = *(int *)data; 1714 break; 1715 case TUNGDEBUG: 1716 *(int *)data = tundebug; 1717 break; 1718 case TUNSTRANSIENT: 1719 TUN_LOCK(tp); 1720 if (*(int *)data) 1721 tp->tun_flags |= TUN_TRANSIENT; 1722 else 1723 tp->tun_flags &= ~TUN_TRANSIENT; 1724 TUN_UNLOCK(tp); 1725 break; 1726 case TUNGTRANSIENT: 1727 TUN_LOCK(tp); 1728 *(int *)data = (tp->tun_flags & TUN_TRANSIENT) != 0; 1729 TUN_UNLOCK(tp); 1730 break; 1731 case FIONBIO: 1732 break; 1733 case FIOASYNC: 1734 TUN_LOCK(tp); 1735 if (*(int *)data) 1736 tp->tun_flags |= TUN_ASYNC; 1737 else 1738 tp->tun_flags &= ~TUN_ASYNC; 1739 TUN_UNLOCK(tp); 1740 break; 1741 case FIONREAD: 1742 if (!IFQ_IS_EMPTY(&TUN2IFP(tp)->if_snd)) { 1743 struct mbuf *mb; 1744 IFQ_LOCK(&TUN2IFP(tp)->if_snd); 1745 IFQ_POLL_NOLOCK(&TUN2IFP(tp)->if_snd, mb); 1746 for (*(int *)data = 0; mb != NULL; mb = mb->m_next) 1747 *(int *)data += mb->m_len; 1748 IFQ_UNLOCK(&TUN2IFP(tp)->if_snd); 1749 } else 1750 *(int *)data = 0; 1751 break; 1752 case FIOSETOWN: 1753 return (fsetown(*(int *)data, &tp->tun_sigio)); 1754 1755 case FIOGETOWN: 1756 *(int *)data = fgetown(&tp->tun_sigio); 1757 return (0); 1758 1759 /* This is deprecated, FIOSETOWN should be used instead. */ 1760 case TIOCSPGRP: 1761 return (fsetown(-(*(int *)data), &tp->tun_sigio)); 1762 1763 /* This is deprecated, FIOGETOWN should be used instead. */ 1764 case TIOCGPGRP: 1765 *(int *)data = -fgetown(&tp->tun_sigio); 1766 return (0); 1767 1768 default: 1769 return (ENOTTY); 1770 } 1771 return (0); 1772 } 1773 1774 /* 1775 * The cdevsw read interface - reads a packet at a time, or at 1776 * least as much of a packet as can be read. 1777 */ 1778 static int 1779 tunread(struct cdev *dev, struct uio *uio, int flag) 1780 { 1781 struct tuntap_softc *tp = dev->si_drv1; 1782 struct ifnet *ifp = TUN2IFP(tp); 1783 struct mbuf *m; 1784 size_t len; 1785 int error = 0; 1786 1787 TUNDEBUG (ifp, "read\n"); 1788 TUN_LOCK(tp); 1789 if ((tp->tun_flags & TUN_READY) != TUN_READY) { 1790 TUN_UNLOCK(tp); 1791 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 1792 return (EHOSTDOWN); 1793 } 1794 1795 tp->tun_flags &= ~TUN_RWAIT; 1796 1797 for (;;) { 1798 IFQ_DEQUEUE(&ifp->if_snd, m); 1799 if (m != NULL) 1800 break; 1801 if (flag & O_NONBLOCK) { 1802 TUN_UNLOCK(tp); 1803 return (EWOULDBLOCK); 1804 } 1805 tp->tun_flags |= TUN_RWAIT; 1806 error = mtx_sleep(tp, &tp->tun_mtx, PCATCH | PZERO, 1807 "tunread", 0); 1808 if (error != 0) { 1809 TUN_UNLOCK(tp); 1810 return (error); 1811 } 1812 } 1813 TUN_UNLOCK(tp); 1814 1815 len = min(tp->tun_vhdrlen, uio->uio_resid); 1816 if (len > 0) { 1817 struct virtio_net_hdr_mrg_rxbuf vhdr; 1818 1819 bzero(&vhdr, sizeof(vhdr)); 1820 if (m->m_pkthdr.csum_flags & TAP_ALL_OFFLOAD) { 1821 m = virtio_net_tx_offload(ifp, m, false, &vhdr.hdr); 1822 } 1823 1824 TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, " 1825 "gs %u, cs %u, co %u\n", vhdr.hdr.flags, 1826 vhdr.hdr.gso_type, vhdr.hdr.hdr_len, 1827 vhdr.hdr.gso_size, vhdr.hdr.csum_start, 1828 vhdr.hdr.csum_offset); 1829 error = uiomove(&vhdr, len, uio); 1830 } 1831 if (error == 0) 1832 error = m_mbuftouio(uio, m, 0); 1833 m_freem(m); 1834 return (error); 1835 } 1836 1837 static int 1838 tunwrite_l2(struct tuntap_softc *tp, struct mbuf *m, 1839 struct virtio_net_hdr_mrg_rxbuf *vhdr) 1840 { 1841 struct epoch_tracker et; 1842 struct ether_header *eh; 1843 struct ifnet *ifp; 1844 1845 ifp = TUN2IFP(tp); 1846 1847 /* 1848 * Only pass a unicast frame to ether_input(), if it would 1849 * actually have been received by non-virtual hardware. 1850 */ 1851 if (m->m_len < sizeof(struct ether_header)) { 1852 m_freem(m); 1853 return (0); 1854 } 1855 1856 eh = mtod(m, struct ether_header *); 1857 1858 if ((ifp->if_flags & IFF_PROMISC) == 0 && 1859 !ETHER_IS_MULTICAST(eh->ether_dhost) && 1860 bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) { 1861 m_freem(m); 1862 return (0); 1863 } 1864 1865 if (vhdr != NULL) { 1866 if (virtio_net_rx_csum(m, &vhdr->hdr)) { 1867 m_freem(m); 1868 return (0); 1869 } 1870 } else { 1871 switch (ntohs(eh->ether_type)) { 1872 #ifdef INET 1873 case ETHERTYPE_IP: 1874 if (ifp->if_capenable & IFCAP_RXCSUM) { 1875 m->m_pkthdr.csum_flags |= 1876 CSUM_IP_CHECKED | CSUM_IP_VALID | 1877 CSUM_DATA_VALID | CSUM_SCTP_VALID | 1878 CSUM_PSEUDO_HDR; 1879 m->m_pkthdr.csum_data = 0xffff; 1880 } 1881 break; 1882 #endif 1883 #ifdef INET6 1884 case ETHERTYPE_IPV6: 1885 if (ifp->if_capenable & IFCAP_RXCSUM_IPV6) { 1886 m->m_pkthdr.csum_flags |= 1887 CSUM_DATA_VALID_IPV6 | CSUM_SCTP_VALID | 1888 CSUM_PSEUDO_HDR; 1889 m->m_pkthdr.csum_data = 0xffff; 1890 } 1891 break; 1892 #endif 1893 } 1894 } 1895 1896 /* Pass packet up to parent. */ 1897 CURVNET_SET(ifp->if_vnet); 1898 NET_EPOCH_ENTER(et); 1899 #if defined(INET) || defined(INET6) 1900 if (tp->tun_lro_ready && ifp->if_capenable & IFCAP_LRO && 1901 tcp_lro_rx(&tp->tun_lro, m, 0) == 0) 1902 tcp_lro_flush_all(&tp->tun_lro); 1903 else 1904 #endif 1905 (*ifp->if_input)(ifp, m); 1906 NET_EPOCH_EXIT(et); 1907 CURVNET_RESTORE(); 1908 /* ibytes are counted in parent */ 1909 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 1910 return (0); 1911 } 1912 1913 static int 1914 tunwrite_l3(struct tuntap_softc *tp, struct mbuf *m) 1915 { 1916 struct epoch_tracker et; 1917 struct ifnet *ifp; 1918 int family, isr; 1919 1920 ifp = TUN2IFP(tp); 1921 /* Could be unlocked read? */ 1922 TUN_LOCK(tp); 1923 if (tp->tun_flags & TUN_IFHEAD) { 1924 TUN_UNLOCK(tp); 1925 if (m->m_len < sizeof(family) && 1926 (m = m_pullup(m, sizeof(family))) == NULL) 1927 return (ENOBUFS); 1928 family = ntohl(*mtod(m, u_int32_t *)); 1929 m_adj(m, sizeof(family)); 1930 } else { 1931 TUN_UNLOCK(tp); 1932 family = AF_INET; 1933 } 1934 1935 BPF_MTAP2(ifp, &family, sizeof(family), m); 1936 1937 switch (family) { 1938 #ifdef INET 1939 case AF_INET: 1940 isr = NETISR_IP; 1941 break; 1942 #endif 1943 #ifdef INET6 1944 case AF_INET6: 1945 isr = NETISR_IPV6; 1946 break; 1947 #endif 1948 default: 1949 m_freem(m); 1950 return (EAFNOSUPPORT); 1951 } 1952 random_harvest_queue(m, sizeof(*m), RANDOM_NET_TUN); 1953 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 1954 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 1955 CURVNET_SET(ifp->if_vnet); 1956 M_SETFIB(m, ifp->if_fib); 1957 NET_EPOCH_ENTER(et); 1958 netisr_dispatch(isr, m); 1959 NET_EPOCH_EXIT(et); 1960 CURVNET_RESTORE(); 1961 return (0); 1962 } 1963 1964 /* 1965 * the cdevsw write interface - an atomic write is a packet - or else! 1966 */ 1967 static int 1968 tunwrite(struct cdev *dev, struct uio *uio, int flag) 1969 { 1970 struct virtio_net_hdr_mrg_rxbuf vhdr; 1971 struct tuntap_softc *tp; 1972 struct ifnet *ifp; 1973 struct mbuf *m; 1974 uint32_t mru; 1975 int align, vhdrlen, error; 1976 bool l2tun; 1977 1978 tp = dev->si_drv1; 1979 ifp = TUN2IFP(tp); 1980 TUNDEBUG(ifp, "tunwrite\n"); 1981 if ((ifp->if_flags & IFF_UP) != IFF_UP) 1982 /* ignore silently */ 1983 return (0); 1984 1985 if (uio->uio_resid == 0) 1986 return (0); 1987 1988 l2tun = (tp->tun_flags & TUN_L2) != 0; 1989 mru = l2tun ? TAPMRU : TUNMRU; 1990 vhdrlen = tp->tun_vhdrlen; 1991 align = 0; 1992 if (l2tun) { 1993 align = ETHER_ALIGN; 1994 mru += vhdrlen; 1995 } else if ((tp->tun_flags & TUN_IFHEAD) != 0) 1996 mru += sizeof(uint32_t); /* family */ 1997 if (uio->uio_resid < 0 || uio->uio_resid > mru) { 1998 TUNDEBUG(ifp, "len=%zd!\n", uio->uio_resid); 1999 return (EIO); 2000 } 2001 2002 if (vhdrlen > 0) { 2003 error = uiomove(&vhdr, vhdrlen, uio); 2004 if (error != 0) 2005 return (error); 2006 TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, " 2007 "gs %u, cs %u, co %u\n", vhdr.hdr.flags, 2008 vhdr.hdr.gso_type, vhdr.hdr.hdr_len, 2009 vhdr.hdr.gso_size, vhdr.hdr.csum_start, 2010 vhdr.hdr.csum_offset); 2011 } 2012 2013 if ((m = m_uiotombuf(uio, M_NOWAIT, 0, align, M_PKTHDR)) == NULL) { 2014 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 2015 return (ENOBUFS); 2016 } 2017 2018 m->m_pkthdr.rcvif = ifp; 2019 #ifdef MAC 2020 mac_ifnet_create_mbuf(ifp, m); 2021 #endif 2022 2023 if (l2tun) 2024 return (tunwrite_l2(tp, m, vhdrlen > 0 ? &vhdr : NULL)); 2025 2026 return (tunwrite_l3(tp, m)); 2027 } 2028 2029 /* 2030 * tunpoll - the poll interface, this is only useful on reads 2031 * really. The write detect always returns true, write never blocks 2032 * anyway, it either accepts the packet or drops it. 2033 */ 2034 static int 2035 tunpoll(struct cdev *dev, int events, struct thread *td) 2036 { 2037 struct tuntap_softc *tp = dev->si_drv1; 2038 struct ifnet *ifp = TUN2IFP(tp); 2039 int revents = 0; 2040 2041 TUNDEBUG(ifp, "tunpoll\n"); 2042 2043 if (events & (POLLIN | POLLRDNORM)) { 2044 IFQ_LOCK(&ifp->if_snd); 2045 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 2046 TUNDEBUG(ifp, "tunpoll q=%d\n", ifp->if_snd.ifq_len); 2047 revents |= events & (POLLIN | POLLRDNORM); 2048 } else { 2049 TUNDEBUG(ifp, "tunpoll waiting\n"); 2050 selrecord(td, &tp->tun_rsel); 2051 } 2052 IFQ_UNLOCK(&ifp->if_snd); 2053 } 2054 revents |= events & (POLLOUT | POLLWRNORM); 2055 2056 return (revents); 2057 } 2058 2059 /* 2060 * tunkqfilter - support for the kevent() system call. 2061 */ 2062 static int 2063 tunkqfilter(struct cdev *dev, struct knote *kn) 2064 { 2065 struct tuntap_softc *tp = dev->si_drv1; 2066 struct ifnet *ifp = TUN2IFP(tp); 2067 2068 switch(kn->kn_filter) { 2069 case EVFILT_READ: 2070 TUNDEBUG(ifp, "%s kqfilter: EVFILT_READ, minor = %#x\n", 2071 ifp->if_xname, dev2unit(dev)); 2072 kn->kn_fop = &tun_read_filterops; 2073 break; 2074 2075 case EVFILT_WRITE: 2076 TUNDEBUG(ifp, "%s kqfilter: EVFILT_WRITE, minor = %#x\n", 2077 ifp->if_xname, dev2unit(dev)); 2078 kn->kn_fop = &tun_write_filterops; 2079 break; 2080 2081 default: 2082 TUNDEBUG(ifp, "%s kqfilter: invalid filter, minor = %#x\n", 2083 ifp->if_xname, dev2unit(dev)); 2084 return(EINVAL); 2085 } 2086 2087 kn->kn_hook = tp; 2088 knlist_add(&tp->tun_rsel.si_note, kn, 0); 2089 2090 return (0); 2091 } 2092 2093 /* 2094 * Return true of there is data in the interface queue. 2095 */ 2096 static int 2097 tunkqread(struct knote *kn, long hint) 2098 { 2099 int ret; 2100 struct tuntap_softc *tp = kn->kn_hook; 2101 struct cdev *dev = tp->tun_dev; 2102 struct ifnet *ifp = TUN2IFP(tp); 2103 2104 if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) { 2105 TUNDEBUG(ifp, 2106 "%s have data in the queue. Len = %d, minor = %#x\n", 2107 ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev)); 2108 ret = 1; 2109 } else { 2110 TUNDEBUG(ifp, 2111 "%s waiting for data, minor = %#x\n", ifp->if_xname, 2112 dev2unit(dev)); 2113 ret = 0; 2114 } 2115 2116 return (ret); 2117 } 2118 2119 /* 2120 * Always can write, always return MTU in kn->data. 2121 */ 2122 static int 2123 tunkqwrite(struct knote *kn, long hint) 2124 { 2125 struct tuntap_softc *tp = kn->kn_hook; 2126 struct ifnet *ifp = TUN2IFP(tp); 2127 2128 kn->kn_data = ifp->if_mtu; 2129 2130 return (1); 2131 } 2132 2133 static void 2134 tunkqdetach(struct knote *kn) 2135 { 2136 struct tuntap_softc *tp = kn->kn_hook; 2137 2138 knlist_remove(&tp->tun_rsel.si_note, kn, 0); 2139 } 2140