1 /* $NetBSD: if_tun.c,v 1.14 1994/06/29 06:36:25 cgd Exp $ */ 2 /*- 3 * SPDX-License-Identifier: BSD-2-Clause 4 * 5 * Copyright (C) 1999-2000 by Maksim Yevmenkin <m_evmenkin@yahoo.com> 6 * All rights reserved. 7 * Copyright (c) 2019 Kyle Evans <kevans@FreeBSD.org> 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * BASED ON: 32 * ------------------------------------------------------------------------- 33 * 34 * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk> 35 * Nottingham University 1987. 36 * 37 * This source may be freely distributed, however I would be interested 38 * in any changes that are made. 39 * 40 * This driver takes packets off the IP i/f and hands them up to a 41 * user process to have its wicked way with. This driver has it's 42 * roots in a similar driver written by Phil Cockcroft (formerly) at 43 * UCL. This driver is based much more on read/write/poll mode of 44 * operation though. 45 */ 46 47 #include "opt_inet.h" 48 #include "opt_inet6.h" 49 50 #include <sys/param.h> 51 #include <sys/lock.h> 52 #include <sys/priv.h> 53 #include <sys/proc.h> 54 #include <sys/systm.h> 55 #include <sys/jail.h> 56 #include <sys/mbuf.h> 57 #include <sys/module.h> 58 #include <sys/socket.h> 59 #include <sys/eventhandler.h> 60 #include <sys/fcntl.h> 61 #include <sys/filio.h> 62 #include <sys/sockio.h> 63 #include <sys/sx.h> 64 #include <sys/syslog.h> 65 #include <sys/ttycom.h> 66 #include <sys/poll.h> 67 #include <sys/selinfo.h> 68 #include <sys/signalvar.h> 69 #include <sys/filedesc.h> 70 #include <sys/kernel.h> 71 #include <sys/sysctl.h> 72 #include <sys/conf.h> 73 #include <sys/uio.h> 74 #include <sys/malloc.h> 75 #include <sys/random.h> 76 #include <sys/ctype.h> 77 78 #include <net/ethernet.h> 79 #include <net/if.h> 80 #include <net/if_var.h> 81 #include <net/if_clone.h> 82 #include <net/if_dl.h> 83 #include <net/if_media.h> 84 #include <net/if_private.h> 85 #include <net/if_types.h> 86 #include <net/if_vlan_var.h> 87 #include <net/netisr.h> 88 #include <net/route.h> 89 #include <net/vnet.h> 90 #include <netinet/in.h> 91 #ifdef INET 92 #include <netinet/ip.h> 93 #endif 94 #ifdef INET6 95 #include <netinet/ip6.h> 96 #include <netinet6/ip6_var.h> 97 #endif 98 #include <netinet/udp.h> 99 #include <netinet/tcp.h> 100 #include <netinet/tcp_lro.h> 101 #include <net/bpf.h> 102 #include <net/if_tap.h> 103 #include <net/if_tun.h> 104 105 #include <dev/virtio/network/virtio_net.h> 106 107 #include <sys/queue.h> 108 #include <sys/condvar.h> 109 #include <security/mac/mac_framework.h> 110 111 struct tuntap_driver; 112 113 /* 114 * tun_list is protected by global tunmtx. Other mutable fields are 115 * protected by tun->tun_mtx, or by their owning subsystem. tun_dev is 116 * static for the duration of a tunnel interface. 117 */ 118 struct tuntap_softc { 119 TAILQ_ENTRY(tuntap_softc) tun_list; 120 struct cdev *tun_alias; 121 struct cdev *tun_dev; 122 u_short tun_flags; /* misc flags */ 123 #define TUN_OPEN 0x0001 124 #define TUN_INITED 0x0002 125 #define TUN_UNUSED1 0x0008 126 #define TUN_UNUSED2 0x0010 127 #define TUN_LMODE 0x0020 128 #define TUN_RWAIT 0x0040 129 #define TUN_ASYNC 0x0080 130 #define TUN_IFHEAD 0x0100 131 #define TUN_DYING 0x0200 132 #define TUN_L2 0x0400 133 #define TUN_VMNET 0x0800 134 135 #define TUN_DRIVER_IDENT_MASK (TUN_L2 | TUN_VMNET) 136 #define TUN_READY (TUN_OPEN | TUN_INITED) 137 138 pid_t tun_pid; /* owning pid */ 139 struct ifnet *tun_ifp; /* the interface */ 140 struct sigio *tun_sigio; /* async I/O info */ 141 struct tuntap_driver *tun_drv; /* appropriate driver */ 142 struct selinfo tun_rsel; /* read select */ 143 struct mtx tun_mtx; /* softc field mutex */ 144 struct cv tun_cv; /* for ref'd dev destroy */ 145 struct ether_addr tun_ether; /* remote address */ 146 int tun_busy; /* busy count */ 147 int tun_vhdrlen; /* virtio-net header length */ 148 struct lro_ctrl tun_lro; /* for TCP LRO */ 149 bool tun_lro_ready; /* TCP LRO initialized */ 150 }; 151 #define TUN2IFP(sc) ((sc)->tun_ifp) 152 153 #define TUNDEBUG if (tundebug) if_printf 154 155 #define TUN_LOCK(tp) mtx_lock(&(tp)->tun_mtx) 156 #define TUN_UNLOCK(tp) mtx_unlock(&(tp)->tun_mtx) 157 #define TUN_LOCK_ASSERT(tp) mtx_assert(&(tp)->tun_mtx, MA_OWNED); 158 159 #define TUN_VMIO_FLAG_MASK 0x0fff 160 161 /* 162 * Interface capabilities of a tap device that supports the virtio-net 163 * header. 164 */ 165 #define TAP_VNET_HDR_CAPS (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6 \ 166 | IFCAP_VLAN_HWCSUM \ 167 | IFCAP_TSO | IFCAP_LRO \ 168 | IFCAP_VLAN_HWTSO) 169 170 #define TAP_ALL_OFFLOAD (CSUM_TSO | CSUM_TCP | CSUM_UDP |\ 171 CSUM_TCP_IPV6 | CSUM_UDP_IPV6) 172 173 /* 174 * All mutable global variables in if_tun are locked using tunmtx, with 175 * the exception of tundebug, which is used unlocked, and the drivers' *clones, 176 * which are static after setup. 177 */ 178 static struct mtx tunmtx; 179 static eventhandler_tag arrival_tag; 180 static eventhandler_tag clone_tag; 181 static const char tunname[] = "tun"; 182 static const char tapname[] = "tap"; 183 static const char vmnetname[] = "vmnet"; 184 static MALLOC_DEFINE(M_TUN, tunname, "Tunnel Interface"); 185 static int tundebug = 0; 186 static int tundclone = 1; 187 static int tap_allow_uopen = 0; /* allow user devfs cloning */ 188 static int tapuponopen = 0; /* IFF_UP on open() */ 189 static int tapdclone = 1; /* enable devfs cloning */ 190 191 static TAILQ_HEAD(,tuntap_softc) tunhead = TAILQ_HEAD_INITIALIZER(tunhead); 192 SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, ""); 193 194 static struct sx tun_ioctl_sx; 195 SX_SYSINIT(tun_ioctl_sx, &tun_ioctl_sx, "tun_ioctl"); 196 197 SYSCTL_DECL(_net_link); 198 /* tun */ 199 static SYSCTL_NODE(_net_link, OID_AUTO, tun, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 200 "IP tunnel software network interface"); 201 SYSCTL_INT(_net_link_tun, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tundclone, 0, 202 "Enable legacy devfs interface creation"); 203 204 /* tap */ 205 static SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 206 "Ethernet tunnel software network interface"); 207 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tap_allow_uopen, 0, 208 "Enable legacy devfs interface creation for all users"); 209 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0, 210 "Bring interface up when /dev/tap is opened"); 211 SYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tapdclone, 0, 212 "Enable legacy devfs interface creation"); 213 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tundebug, 0, ""); 214 215 static int tun_create_device(struct tuntap_driver *drv, int unit, 216 struct ucred *cr, struct cdev **dev, const char *name); 217 static int tun_busy_locked(struct tuntap_softc *tp); 218 static void tun_unbusy_locked(struct tuntap_softc *tp); 219 static int tun_busy(struct tuntap_softc *tp); 220 static void tun_unbusy(struct tuntap_softc *tp); 221 222 static int tuntap_name2info(const char *name, int *unit, int *flags); 223 static void tunclone(void *arg, struct ucred *cred, char *name, 224 int namelen, struct cdev **dev); 225 static void tuncreate(struct cdev *dev); 226 static void tundtor(void *data); 227 static void tunrename(void *arg, struct ifnet *ifp); 228 static int tunifioctl(struct ifnet *, u_long, caddr_t); 229 static void tuninit(struct ifnet *); 230 static void tunifinit(void *xtp); 231 static int tuntapmodevent(module_t, int, void *); 232 static int tunoutput(struct ifnet *, struct mbuf *, 233 const struct sockaddr *, struct route *ro); 234 static void tunstart(struct ifnet *); 235 static void tunstart_l2(struct ifnet *); 236 237 static int tun_clone_match(struct if_clone *ifc, const char *name); 238 static int tap_clone_match(struct if_clone *ifc, const char *name); 239 static int vmnet_clone_match(struct if_clone *ifc, const char *name); 240 static int tun_clone_create(struct if_clone *, char *, size_t, 241 struct ifc_data *, struct ifnet **); 242 static int tun_clone_destroy(struct if_clone *, struct ifnet *, uint32_t); 243 static void tun_vnethdr_set(struct ifnet *ifp, int vhdrlen); 244 245 static d_open_t tunopen; 246 static d_read_t tunread; 247 static d_write_t tunwrite; 248 static d_ioctl_t tunioctl; 249 static d_poll_t tunpoll; 250 static d_kqfilter_t tunkqfilter; 251 252 static int tunkqread(struct knote *, long); 253 static int tunkqwrite(struct knote *, long); 254 static void tunkqdetach(struct knote *); 255 256 static struct filterops tun_read_filterops = { 257 .f_isfd = 1, 258 .f_attach = NULL, 259 .f_detach = tunkqdetach, 260 .f_event = tunkqread, 261 }; 262 263 static struct filterops tun_write_filterops = { 264 .f_isfd = 1, 265 .f_attach = NULL, 266 .f_detach = tunkqdetach, 267 .f_event = tunkqwrite, 268 }; 269 270 static struct tuntap_driver { 271 struct cdevsw cdevsw; 272 int ident_flags; 273 struct unrhdr *unrhdr; 274 struct clonedevs *clones; 275 ifc_match_f *clone_match_fn; 276 ifc_create_f *clone_create_fn; 277 ifc_destroy_f *clone_destroy_fn; 278 } tuntap_drivers[] = { 279 { 280 .ident_flags = 0, 281 .cdevsw = { 282 .d_version = D_VERSION, 283 .d_flags = D_NEEDMINOR, 284 .d_open = tunopen, 285 .d_read = tunread, 286 .d_write = tunwrite, 287 .d_ioctl = tunioctl, 288 .d_poll = tunpoll, 289 .d_kqfilter = tunkqfilter, 290 .d_name = tunname, 291 }, 292 .clone_match_fn = tun_clone_match, 293 .clone_create_fn = tun_clone_create, 294 .clone_destroy_fn = tun_clone_destroy, 295 }, 296 { 297 .ident_flags = TUN_L2, 298 .cdevsw = { 299 .d_version = D_VERSION, 300 .d_flags = D_NEEDMINOR, 301 .d_open = tunopen, 302 .d_read = tunread, 303 .d_write = tunwrite, 304 .d_ioctl = tunioctl, 305 .d_poll = tunpoll, 306 .d_kqfilter = tunkqfilter, 307 .d_name = tapname, 308 }, 309 .clone_match_fn = tap_clone_match, 310 .clone_create_fn = tun_clone_create, 311 .clone_destroy_fn = tun_clone_destroy, 312 }, 313 { 314 .ident_flags = TUN_L2 | TUN_VMNET, 315 .cdevsw = { 316 .d_version = D_VERSION, 317 .d_flags = D_NEEDMINOR, 318 .d_open = tunopen, 319 .d_read = tunread, 320 .d_write = tunwrite, 321 .d_ioctl = tunioctl, 322 .d_poll = tunpoll, 323 .d_kqfilter = tunkqfilter, 324 .d_name = vmnetname, 325 }, 326 .clone_match_fn = vmnet_clone_match, 327 .clone_create_fn = tun_clone_create, 328 .clone_destroy_fn = tun_clone_destroy, 329 }, 330 }; 331 #define NDRV nitems(tuntap_drivers) 332 333 VNET_DEFINE_STATIC(struct if_clone *, tuntap_driver_cloners[NDRV]); 334 #define V_tuntap_driver_cloners VNET(tuntap_driver_cloners) 335 336 /* 337 * Mechanism for marking a tunnel device as busy so that we can safely do some 338 * orthogonal operations (such as operations on devices) without racing against 339 * tun_destroy. tun_destroy will wait on the condvar if we're at all busy or 340 * open, to be woken up when the condition is alleviated. 341 */ 342 static int 343 tun_busy_locked(struct tuntap_softc *tp) 344 { 345 346 TUN_LOCK_ASSERT(tp); 347 if ((tp->tun_flags & TUN_DYING) != 0) { 348 /* 349 * Perhaps unintuitive, but the device is busy going away. 350 * Other interpretations of EBUSY from tun_busy make little 351 * sense, since making a busy device even more busy doesn't 352 * sound like a problem. 353 */ 354 return (EBUSY); 355 } 356 357 ++tp->tun_busy; 358 return (0); 359 } 360 361 static void 362 tun_unbusy_locked(struct tuntap_softc *tp) 363 { 364 365 TUN_LOCK_ASSERT(tp); 366 KASSERT(tp->tun_busy != 0, ("tun_unbusy: called for non-busy tunnel")); 367 368 --tp->tun_busy; 369 /* Wake up anything that may be waiting on our busy tunnel. */ 370 if (tp->tun_busy == 0) 371 cv_broadcast(&tp->tun_cv); 372 } 373 374 static int 375 tun_busy(struct tuntap_softc *tp) 376 { 377 int ret; 378 379 TUN_LOCK(tp); 380 ret = tun_busy_locked(tp); 381 TUN_UNLOCK(tp); 382 return (ret); 383 } 384 385 static void 386 tun_unbusy(struct tuntap_softc *tp) 387 { 388 389 TUN_LOCK(tp); 390 tun_unbusy_locked(tp); 391 TUN_UNLOCK(tp); 392 } 393 394 /* 395 * Sets unit and/or flags given the device name. Must be called with correct 396 * vnet context. 397 */ 398 static int 399 tuntap_name2info(const char *name, int *outunit, int *outflags) 400 { 401 struct tuntap_driver *drv; 402 char *dname; 403 int flags, unit; 404 bool found; 405 406 if (name == NULL) 407 return (EINVAL); 408 409 /* 410 * Needed for dev_stdclone, but dev_stdclone will not modify, it just 411 * wants to be able to pass back a char * through the second param. We 412 * will always set that as NULL here, so we'll fake it. 413 */ 414 dname = __DECONST(char *, name); 415 found = false; 416 417 for (u_int i = 0; i < NDRV; i++) { 418 drv = &tuntap_drivers[i]; 419 420 if (strcmp(name, drv->cdevsw.d_name) == 0) { 421 found = true; 422 unit = -1; 423 flags = drv->ident_flags; 424 break; 425 } 426 427 if (dev_stdclone(dname, NULL, drv->cdevsw.d_name, &unit) == 1) { 428 found = true; 429 flags = drv->ident_flags; 430 break; 431 } 432 } 433 434 if (!found) 435 return (ENXIO); 436 437 if (outunit != NULL) 438 *outunit = unit; 439 if (outflags != NULL) 440 *outflags = flags; 441 return (0); 442 } 443 444 /* 445 * Get driver information from a set of flags specified. Masks the identifying 446 * part of the flags and compares it against all of the available 447 * tuntap_drivers. 448 */ 449 static struct tuntap_driver * 450 tuntap_driver_from_flags(int tun_flags) 451 { 452 453 for (u_int i = 0; i < NDRV; i++) 454 if ((tun_flags & TUN_DRIVER_IDENT_MASK) == 455 tuntap_drivers[i].ident_flags) 456 return (&tuntap_drivers[i]); 457 458 return (NULL); 459 } 460 461 static int 462 tun_clone_match(struct if_clone *ifc, const char *name) 463 { 464 int tunflags; 465 466 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 467 if ((tunflags & TUN_L2) == 0) 468 return (1); 469 } 470 471 return (0); 472 } 473 474 static int 475 tap_clone_match(struct if_clone *ifc, const char *name) 476 { 477 int tunflags; 478 479 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 480 if ((tunflags & (TUN_L2 | TUN_VMNET)) == TUN_L2) 481 return (1); 482 } 483 484 return (0); 485 } 486 487 static int 488 vmnet_clone_match(struct if_clone *ifc, const char *name) 489 { 490 int tunflags; 491 492 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 493 if ((tunflags & TUN_VMNET) != 0) 494 return (1); 495 } 496 497 return (0); 498 } 499 500 static int 501 tun_clone_create(struct if_clone *ifc, char *name, size_t len, 502 struct ifc_data *ifd, struct ifnet **ifpp) 503 { 504 struct tuntap_driver *drv; 505 struct cdev *dev; 506 int err, i, tunflags, unit; 507 508 tunflags = 0; 509 /* The name here tells us exactly what we're creating */ 510 err = tuntap_name2info(name, &unit, &tunflags); 511 if (err != 0) 512 return (err); 513 514 drv = tuntap_driver_from_flags(tunflags); 515 if (drv == NULL) 516 return (ENXIO); 517 518 if (unit != -1) { 519 /* If this unit number is still available that's okay. */ 520 if (alloc_unr_specific(drv->unrhdr, unit) == -1) 521 return (EEXIST); 522 } else { 523 unit = alloc_unr(drv->unrhdr); 524 } 525 526 snprintf(name, IFNAMSIZ, "%s%d", drv->cdevsw.d_name, unit); 527 528 /* find any existing device, or allocate new unit number */ 529 dev = NULL; 530 i = clone_create(&drv->clones, &drv->cdevsw, &unit, &dev, 0); 531 /* No preexisting struct cdev *, create one */ 532 if (i != 0) 533 i = tun_create_device(drv, unit, NULL, &dev, name); 534 if (i == 0) { 535 dev_ref(dev); 536 tuncreate(dev); 537 struct tuntap_softc *tp = dev->si_drv1; 538 *ifpp = tp->tun_ifp; 539 } 540 541 return (i); 542 } 543 544 static void 545 tunclone(void *arg, struct ucred *cred, char *name, int namelen, 546 struct cdev **dev) 547 { 548 char devname[SPECNAMELEN + 1]; 549 struct tuntap_driver *drv; 550 int append_unit, i, u, tunflags; 551 bool mayclone; 552 553 if (*dev != NULL) 554 return; 555 556 tunflags = 0; 557 CURVNET_SET(CRED_TO_VNET(cred)); 558 if (tuntap_name2info(name, &u, &tunflags) != 0) 559 goto out; /* Not recognized */ 560 561 if (u != -1 && u > IF_MAXUNIT) 562 goto out; /* Unit number too high */ 563 564 mayclone = priv_check_cred(cred, PRIV_NET_IFCREATE) == 0; 565 if ((tunflags & TUN_L2) != 0) { 566 /* tap/vmnet allow user open with a sysctl */ 567 mayclone = (mayclone || tap_allow_uopen) && tapdclone; 568 } else { 569 mayclone = mayclone && tundclone; 570 } 571 572 /* 573 * If tun cloning is enabled, only the superuser can create an 574 * interface. 575 */ 576 if (!mayclone) 577 goto out; 578 579 if (u == -1) 580 append_unit = 1; 581 else 582 append_unit = 0; 583 584 drv = tuntap_driver_from_flags(tunflags); 585 if (drv == NULL) 586 goto out; 587 588 /* find any existing device, or allocate new unit number */ 589 i = clone_create(&drv->clones, &drv->cdevsw, &u, dev, 0); 590 if (i) { 591 if (append_unit) { 592 namelen = snprintf(devname, sizeof(devname), "%s%d", 593 name, u); 594 name = devname; 595 } 596 597 i = tun_create_device(drv, u, cred, dev, name); 598 } 599 if (i == 0) { 600 dev_ref(*dev); 601 if_clone_create(name, namelen, NULL); 602 } 603 out: 604 CURVNET_RESTORE(); 605 } 606 607 static void 608 tun_destroy(struct tuntap_softc *tp) 609 { 610 611 TUN_LOCK(tp); 612 tp->tun_flags |= TUN_DYING; 613 if (tp->tun_busy != 0) 614 cv_wait_unlock(&tp->tun_cv, &tp->tun_mtx); 615 else 616 TUN_UNLOCK(tp); 617 618 CURVNET_SET(TUN2IFP(tp)->if_vnet); 619 620 /* destroy_dev will take care of any alias. */ 621 destroy_dev(tp->tun_dev); 622 seldrain(&tp->tun_rsel); 623 knlist_clear(&tp->tun_rsel.si_note, 0); 624 knlist_destroy(&tp->tun_rsel.si_note); 625 if ((tp->tun_flags & TUN_L2) != 0) { 626 ether_ifdetach(TUN2IFP(tp)); 627 } else { 628 bpfdetach(TUN2IFP(tp)); 629 if_detach(TUN2IFP(tp)); 630 } 631 sx_xlock(&tun_ioctl_sx); 632 TUN2IFP(tp)->if_softc = NULL; 633 sx_xunlock(&tun_ioctl_sx); 634 free_unr(tp->tun_drv->unrhdr, TUN2IFP(tp)->if_dunit); 635 if_free(TUN2IFP(tp)); 636 mtx_destroy(&tp->tun_mtx); 637 cv_destroy(&tp->tun_cv); 638 free(tp, M_TUN); 639 CURVNET_RESTORE(); 640 } 641 642 static int 643 tun_clone_destroy(struct if_clone *ifc __unused, struct ifnet *ifp, uint32_t flags) 644 { 645 struct tuntap_softc *tp = ifp->if_softc; 646 647 mtx_lock(&tunmtx); 648 TAILQ_REMOVE(&tunhead, tp, tun_list); 649 mtx_unlock(&tunmtx); 650 tun_destroy(tp); 651 652 return (0); 653 } 654 655 static void 656 vnet_tun_init(const void *unused __unused) 657 { 658 659 for (u_int i = 0; i < NDRV; ++i) { 660 struct if_clone_addreq req = { 661 .match_f = tuntap_drivers[i].clone_match_fn, 662 .create_f = tuntap_drivers[i].clone_create_fn, 663 .destroy_f = tuntap_drivers[i].clone_destroy_fn, 664 }; 665 V_tuntap_driver_cloners[i] = 666 ifc_attach_cloner(tuntap_drivers[i].cdevsw.d_name, &req); 667 }; 668 } 669 VNET_SYSINIT(vnet_tun_init, SI_SUB_PROTO_IF, SI_ORDER_ANY, 670 vnet_tun_init, NULL); 671 672 static void 673 vnet_tun_uninit(const void *unused __unused) 674 { 675 676 for (u_int i = 0; i < NDRV; ++i) 677 if_clone_detach(V_tuntap_driver_cloners[i]); 678 } 679 VNET_SYSUNINIT(vnet_tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY, 680 vnet_tun_uninit, NULL); 681 682 static void 683 tun_uninit(const void *unused __unused) 684 { 685 struct tuntap_driver *drv; 686 struct tuntap_softc *tp; 687 int i; 688 689 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, arrival_tag); 690 EVENTHANDLER_DEREGISTER(dev_clone, clone_tag); 691 692 mtx_lock(&tunmtx); 693 while ((tp = TAILQ_FIRST(&tunhead)) != NULL) { 694 TAILQ_REMOVE(&tunhead, tp, tun_list); 695 mtx_unlock(&tunmtx); 696 tun_destroy(tp); 697 mtx_lock(&tunmtx); 698 } 699 mtx_unlock(&tunmtx); 700 for (i = 0; i < nitems(tuntap_drivers); ++i) { 701 drv = &tuntap_drivers[i]; 702 delete_unrhdr(drv->unrhdr); 703 clone_cleanup(&drv->clones); 704 } 705 mtx_destroy(&tunmtx); 706 } 707 SYSUNINIT(tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY, tun_uninit, NULL); 708 709 static struct tuntap_driver * 710 tuntap_driver_from_ifnet(const struct ifnet *ifp) 711 { 712 struct tuntap_driver *drv; 713 int i; 714 715 if (ifp == NULL) 716 return (NULL); 717 718 for (i = 0; i < nitems(tuntap_drivers); ++i) { 719 drv = &tuntap_drivers[i]; 720 if (strcmp(ifp->if_dname, drv->cdevsw.d_name) == 0) 721 return (drv); 722 } 723 724 return (NULL); 725 } 726 727 static int 728 tuntapmodevent(module_t mod, int type, void *data) 729 { 730 struct tuntap_driver *drv; 731 int i; 732 733 switch (type) { 734 case MOD_LOAD: 735 mtx_init(&tunmtx, "tunmtx", NULL, MTX_DEF); 736 for (i = 0; i < nitems(tuntap_drivers); ++i) { 737 drv = &tuntap_drivers[i]; 738 clone_setup(&drv->clones); 739 drv->unrhdr = new_unrhdr(0, IF_MAXUNIT, &tunmtx); 740 } 741 arrival_tag = EVENTHANDLER_REGISTER(ifnet_arrival_event, 742 tunrename, 0, 1000); 743 if (arrival_tag == NULL) 744 return (ENOMEM); 745 clone_tag = EVENTHANDLER_REGISTER(dev_clone, tunclone, 0, 1000); 746 if (clone_tag == NULL) 747 return (ENOMEM); 748 break; 749 case MOD_UNLOAD: 750 /* See tun_uninit, so it's done after the vnet_sysuninit() */ 751 break; 752 default: 753 return EOPNOTSUPP; 754 } 755 return 0; 756 } 757 758 static moduledata_t tuntap_mod = { 759 "if_tuntap", 760 tuntapmodevent, 761 0 762 }; 763 764 /* We'll only ever have these two, so no need for a macro. */ 765 static moduledata_t tun_mod = { "if_tun", NULL, 0 }; 766 static moduledata_t tap_mod = { "if_tap", NULL, 0 }; 767 768 DECLARE_MODULE(if_tuntap, tuntap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 769 MODULE_VERSION(if_tuntap, 1); 770 DECLARE_MODULE(if_tun, tun_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 771 MODULE_VERSION(if_tun, 1); 772 DECLARE_MODULE(if_tap, tap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 773 MODULE_VERSION(if_tap, 1); 774 775 static int 776 tun_create_device(struct tuntap_driver *drv, int unit, struct ucred *cr, 777 struct cdev **dev, const char *name) 778 { 779 struct make_dev_args args; 780 struct tuntap_softc *tp; 781 int error; 782 783 tp = malloc(sizeof(*tp), M_TUN, M_WAITOK | M_ZERO); 784 mtx_init(&tp->tun_mtx, "tun_mtx", NULL, MTX_DEF); 785 cv_init(&tp->tun_cv, "tun_condvar"); 786 tp->tun_flags = drv->ident_flags; 787 tp->tun_drv = drv; 788 789 make_dev_args_init(&args); 790 if (cr != NULL) 791 args.mda_flags = MAKEDEV_REF | MAKEDEV_CHECKNAME; 792 args.mda_devsw = &drv->cdevsw; 793 args.mda_cr = cr; 794 args.mda_uid = UID_UUCP; 795 args.mda_gid = GID_DIALER; 796 args.mda_mode = 0600; 797 args.mda_unit = unit; 798 args.mda_si_drv1 = tp; 799 error = make_dev_s(&args, dev, "%s", name); 800 if (error != 0) { 801 free(tp, M_TUN); 802 return (error); 803 } 804 805 KASSERT((*dev)->si_drv1 != NULL, 806 ("Failed to set si_drv1 at %s creation", name)); 807 tp->tun_dev = *dev; 808 knlist_init_mtx(&tp->tun_rsel.si_note, &tp->tun_mtx); 809 mtx_lock(&tunmtx); 810 TAILQ_INSERT_TAIL(&tunhead, tp, tun_list); 811 mtx_unlock(&tunmtx); 812 return (0); 813 } 814 815 static void 816 tunstart(struct ifnet *ifp) 817 { 818 struct tuntap_softc *tp = ifp->if_softc; 819 struct mbuf *m; 820 821 TUNDEBUG(ifp, "starting\n"); 822 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 823 IFQ_LOCK(&ifp->if_snd); 824 IFQ_POLL_NOLOCK(&ifp->if_snd, m); 825 if (m == NULL) { 826 IFQ_UNLOCK(&ifp->if_snd); 827 return; 828 } 829 IFQ_UNLOCK(&ifp->if_snd); 830 } 831 832 TUN_LOCK(tp); 833 if (tp->tun_flags & TUN_RWAIT) { 834 tp->tun_flags &= ~TUN_RWAIT; 835 wakeup(tp); 836 } 837 selwakeuppri(&tp->tun_rsel, PZERO + 1); 838 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 839 if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio) { 840 TUN_UNLOCK(tp); 841 pgsigio(&tp->tun_sigio, SIGIO, 0); 842 } else 843 TUN_UNLOCK(tp); 844 } 845 846 /* 847 * tunstart_l2 848 * 849 * queue packets from higher level ready to put out 850 */ 851 static void 852 tunstart_l2(struct ifnet *ifp) 853 { 854 struct tuntap_softc *tp = ifp->if_softc; 855 856 TUNDEBUG(ifp, "starting\n"); 857 858 /* 859 * do not junk pending output if we are in VMnet mode. 860 * XXX: can this do any harm because of queue overflow? 861 */ 862 863 TUN_LOCK(tp); 864 if (((tp->tun_flags & TUN_VMNET) == 0) && 865 ((tp->tun_flags & TUN_READY) != TUN_READY)) { 866 struct mbuf *m; 867 868 /* Unlocked read. */ 869 TUNDEBUG(ifp, "not ready, tun_flags = 0x%x\n", tp->tun_flags); 870 871 for (;;) { 872 IF_DEQUEUE(&ifp->if_snd, m); 873 if (m != NULL) { 874 m_freem(m); 875 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 876 } else 877 break; 878 } 879 TUN_UNLOCK(tp); 880 881 return; 882 } 883 884 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 885 886 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 887 if (tp->tun_flags & TUN_RWAIT) { 888 tp->tun_flags &= ~TUN_RWAIT; 889 wakeup(tp); 890 } 891 892 if ((tp->tun_flags & TUN_ASYNC) && (tp->tun_sigio != NULL)) { 893 TUN_UNLOCK(tp); 894 pgsigio(&tp->tun_sigio, SIGIO, 0); 895 TUN_LOCK(tp); 896 } 897 898 selwakeuppri(&tp->tun_rsel, PZERO+1); 899 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 900 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); /* obytes are counted in ether_output */ 901 } 902 903 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 904 TUN_UNLOCK(tp); 905 } /* tunstart_l2 */ 906 907 static int 908 tap_transmit(struct ifnet *ifp, struct mbuf *m) 909 { 910 int error; 911 912 BPF_MTAP(ifp, m); 913 IFQ_HANDOFF(ifp, m, error); 914 return (error); 915 } 916 917 /* XXX: should return an error code so it can fail. */ 918 static void 919 tuncreate(struct cdev *dev) 920 { 921 struct tuntap_driver *drv; 922 struct tuntap_softc *tp; 923 struct ifnet *ifp; 924 struct ether_addr eaddr; 925 int iflags; 926 u_char type; 927 928 tp = dev->si_drv1; 929 KASSERT(tp != NULL, 930 ("si_drv1 should have been initialized at creation")); 931 932 drv = tp->tun_drv; 933 iflags = IFF_MULTICAST; 934 if ((tp->tun_flags & TUN_L2) != 0) { 935 type = IFT_ETHER; 936 iflags |= IFF_BROADCAST | IFF_SIMPLEX; 937 } else { 938 type = IFT_PPP; 939 iflags |= IFF_POINTOPOINT; 940 } 941 ifp = tp->tun_ifp = if_alloc(type); 942 ifp->if_softc = tp; 943 if_initname(ifp, drv->cdevsw.d_name, dev2unit(dev)); 944 ifp->if_ioctl = tunifioctl; 945 ifp->if_flags = iflags; 946 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 947 ifp->if_capabilities |= IFCAP_LINKSTATE | IFCAP_MEXTPG; 948 if ((tp->tun_flags & TUN_L2) != 0) 949 ifp->if_capabilities |= 950 IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO; 951 ifp->if_capenable |= IFCAP_LINKSTATE | IFCAP_MEXTPG; 952 953 if ((tp->tun_flags & TUN_L2) != 0) { 954 ifp->if_init = tunifinit; 955 ifp->if_start = tunstart_l2; 956 ifp->if_transmit = tap_transmit; 957 ifp->if_qflush = if_qflush; 958 959 ether_gen_addr(ifp, &eaddr); 960 ether_ifattach(ifp, eaddr.octet); 961 } else { 962 ifp->if_mtu = TUNMTU; 963 ifp->if_start = tunstart; 964 ifp->if_output = tunoutput; 965 966 ifp->if_snd.ifq_drv_maxlen = 0; 967 IFQ_SET_READY(&ifp->if_snd); 968 969 if_attach(ifp); 970 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 971 } 972 973 TUN_LOCK(tp); 974 tp->tun_flags |= TUN_INITED; 975 TUN_UNLOCK(tp); 976 977 TUNDEBUG(ifp, "interface %s is created, minor = %#x\n", 978 ifp->if_xname, dev2unit(dev)); 979 } 980 981 static void 982 tunrename(void *arg __unused, struct ifnet *ifp) 983 { 984 struct tuntap_softc *tp; 985 int error; 986 987 if ((ifp->if_flags & IFF_RENAMING) == 0) 988 return; 989 990 if (tuntap_driver_from_ifnet(ifp) == NULL) 991 return; 992 993 /* 994 * We need to grab the ioctl sx long enough to make sure the softc is 995 * still there. If it is, we can safely try to busy the tun device. 996 * The busy may fail if the device is currently dying, in which case 997 * we do nothing. If it doesn't fail, the busy count stops the device 998 * from dying until we've created the alias (that will then be 999 * subsequently destroyed). 1000 */ 1001 sx_xlock(&tun_ioctl_sx); 1002 tp = ifp->if_softc; 1003 if (tp == NULL) { 1004 sx_xunlock(&tun_ioctl_sx); 1005 return; 1006 } 1007 error = tun_busy(tp); 1008 sx_xunlock(&tun_ioctl_sx); 1009 if (error != 0) 1010 return; 1011 if (tp->tun_alias != NULL) { 1012 destroy_dev(tp->tun_alias); 1013 tp->tun_alias = NULL; 1014 } 1015 1016 if (strcmp(ifp->if_xname, tp->tun_dev->si_name) == 0) 1017 goto out; 1018 1019 /* 1020 * Failure's ok, aliases are created on a best effort basis. If a 1021 * tun user/consumer decides to rename the interface to conflict with 1022 * another device (non-ifnet) on the system, we will assume they know 1023 * what they are doing. make_dev_alias_p won't touch tun_alias on 1024 * failure, so we use it but ignore the return value. 1025 */ 1026 make_dev_alias_p(MAKEDEV_CHECKNAME, &tp->tun_alias, tp->tun_dev, "%s", 1027 ifp->if_xname); 1028 out: 1029 tun_unbusy(tp); 1030 } 1031 1032 static int 1033 tunopen(struct cdev *dev, int flag, int mode, struct thread *td) 1034 { 1035 struct ifnet *ifp; 1036 struct tuntap_softc *tp; 1037 int error __diagused, tunflags; 1038 1039 tunflags = 0; 1040 CURVNET_SET(TD_TO_VNET(td)); 1041 error = tuntap_name2info(dev->si_name, NULL, &tunflags); 1042 if (error != 0) { 1043 CURVNET_RESTORE(); 1044 return (error); /* Shouldn't happen */ 1045 } 1046 1047 tp = dev->si_drv1; 1048 KASSERT(tp != NULL, 1049 ("si_drv1 should have been initialized at creation")); 1050 1051 TUN_LOCK(tp); 1052 if ((tp->tun_flags & TUN_INITED) == 0) { 1053 TUN_UNLOCK(tp); 1054 CURVNET_RESTORE(); 1055 return (ENXIO); 1056 } 1057 if ((tp->tun_flags & (TUN_OPEN | TUN_DYING)) != 0) { 1058 TUN_UNLOCK(tp); 1059 CURVNET_RESTORE(); 1060 return (EBUSY); 1061 } 1062 1063 error = tun_busy_locked(tp); 1064 KASSERT(error == 0, ("Must be able to busy an unopen tunnel")); 1065 ifp = TUN2IFP(tp); 1066 1067 if ((tp->tun_flags & TUN_L2) != 0) { 1068 bcopy(IF_LLADDR(ifp), tp->tun_ether.octet, 1069 sizeof(tp->tun_ether.octet)); 1070 1071 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1072 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1073 1074 if (tapuponopen) 1075 ifp->if_flags |= IFF_UP; 1076 } 1077 1078 tp->tun_pid = td->td_proc->p_pid; 1079 tp->tun_flags |= TUN_OPEN; 1080 1081 if_link_state_change(ifp, LINK_STATE_UP); 1082 TUNDEBUG(ifp, "open\n"); 1083 TUN_UNLOCK(tp); 1084 1085 /* 1086 * This can fail with either ENOENT or EBUSY. This is in the middle of 1087 * d_open, so ENOENT should not be possible. EBUSY is possible, but 1088 * the only cdevpriv dtor being set will be tundtor and the softc being 1089 * passed is constant for a given cdev. We ignore the possible error 1090 * because of this as either "unlikely" or "not actually a problem." 1091 */ 1092 (void)devfs_set_cdevpriv(tp, tundtor); 1093 CURVNET_RESTORE(); 1094 return (0); 1095 } 1096 1097 /* 1098 * tundtor - tear down the device - mark i/f down & delete 1099 * routing info 1100 */ 1101 static void 1102 tundtor(void *data) 1103 { 1104 struct proc *p; 1105 struct tuntap_softc *tp; 1106 struct ifnet *ifp; 1107 bool l2tun; 1108 1109 tp = data; 1110 p = curproc; 1111 ifp = TUN2IFP(tp); 1112 1113 TUN_LOCK(tp); 1114 1115 /* 1116 * Realistically, we can't be obstinate here. This only means that the 1117 * tuntap device was closed out of order, and the last closer wasn't the 1118 * controller. These are still good to know about, though, as software 1119 * should avoid multiple processes with a tuntap device open and 1120 * ill-defined transfer of control (e.g., handoff, TUNSIFPID, close in 1121 * parent). 1122 */ 1123 if (p->p_pid != tp->tun_pid) { 1124 log(LOG_INFO, 1125 "pid %d (%s), %s: tun/tap protocol violation, non-controlling process closed last.\n", 1126 p->p_pid, p->p_comm, tp->tun_dev->si_name); 1127 } 1128 1129 /* 1130 * junk all pending output 1131 */ 1132 CURVNET_SET(ifp->if_vnet); 1133 1134 l2tun = false; 1135 if ((tp->tun_flags & TUN_L2) != 0) { 1136 l2tun = true; 1137 IF_DRAIN(&ifp->if_snd); 1138 } else { 1139 IFQ_PURGE(&ifp->if_snd); 1140 } 1141 1142 /* For vmnet, we won't do most of the address/route bits */ 1143 if ((tp->tun_flags & TUN_VMNET) != 0 || 1144 (l2tun && (ifp->if_flags & IFF_LINK0) != 0)) 1145 goto out; 1146 #if defined(INET) || defined(INET6) 1147 if (l2tun && tp->tun_lro_ready) { 1148 TUNDEBUG (ifp, "LRO disabled\n"); 1149 tcp_lro_free(&tp->tun_lro); 1150 tp->tun_lro_ready = false; 1151 } 1152 #endif 1153 if (ifp->if_flags & IFF_UP) { 1154 TUN_UNLOCK(tp); 1155 if_down(ifp); 1156 TUN_LOCK(tp); 1157 } 1158 1159 /* Delete all addresses and routes which reference this interface. */ 1160 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1161 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1162 TUN_UNLOCK(tp); 1163 if_purgeaddrs(ifp); 1164 TUN_LOCK(tp); 1165 } 1166 1167 out: 1168 if_link_state_change(ifp, LINK_STATE_DOWN); 1169 CURVNET_RESTORE(); 1170 1171 funsetown(&tp->tun_sigio); 1172 selwakeuppri(&tp->tun_rsel, PZERO + 1); 1173 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 1174 TUNDEBUG (ifp, "closed\n"); 1175 tp->tun_flags &= ~TUN_OPEN; 1176 tp->tun_pid = 0; 1177 tun_vnethdr_set(ifp, 0); 1178 1179 tun_unbusy_locked(tp); 1180 TUN_UNLOCK(tp); 1181 } 1182 1183 static void 1184 tuninit(struct ifnet *ifp) 1185 { 1186 struct tuntap_softc *tp = ifp->if_softc; 1187 1188 TUNDEBUG(ifp, "tuninit\n"); 1189 1190 TUN_LOCK(tp); 1191 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1192 if ((tp->tun_flags & TUN_L2) == 0) { 1193 ifp->if_flags |= IFF_UP; 1194 getmicrotime(&ifp->if_lastchange); 1195 TUN_UNLOCK(tp); 1196 } else { 1197 #if defined(INET) || defined(INET6) 1198 if (tcp_lro_init(&tp->tun_lro) == 0) { 1199 TUNDEBUG(ifp, "LRO enabled\n"); 1200 tp->tun_lro.ifp = ifp; 1201 tp->tun_lro_ready = true; 1202 } else { 1203 TUNDEBUG(ifp, "Could not enable LRO\n"); 1204 tp->tun_lro_ready = false; 1205 } 1206 #endif 1207 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1208 TUN_UNLOCK(tp); 1209 /* attempt to start output */ 1210 tunstart_l2(ifp); 1211 } 1212 1213 } 1214 1215 /* 1216 * Used only for l2 tunnel. 1217 */ 1218 static void 1219 tunifinit(void *xtp) 1220 { 1221 struct tuntap_softc *tp; 1222 1223 tp = (struct tuntap_softc *)xtp; 1224 tuninit(tp->tun_ifp); 1225 } 1226 1227 /* 1228 * To be called under TUN_LOCK. Update ifp->if_hwassist according to the 1229 * current value of ifp->if_capenable. 1230 */ 1231 static void 1232 tun_caps_changed(struct ifnet *ifp) 1233 { 1234 uint64_t hwassist = 0; 1235 1236 TUN_LOCK_ASSERT((struct tuntap_softc *)ifp->if_softc); 1237 if (ifp->if_capenable & IFCAP_TXCSUM) 1238 hwassist |= CSUM_TCP | CSUM_UDP; 1239 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) 1240 hwassist |= CSUM_TCP_IPV6 1241 | CSUM_UDP_IPV6; 1242 if (ifp->if_capenable & IFCAP_TSO4) 1243 hwassist |= CSUM_IP_TSO; 1244 if (ifp->if_capenable & IFCAP_TSO6) 1245 hwassist |= CSUM_IP6_TSO; 1246 ifp->if_hwassist = hwassist; 1247 } 1248 1249 /* 1250 * To be called under TUN_LOCK. Update tp->tun_vhdrlen and adjust 1251 * if_capabilities and if_capenable as needed. 1252 */ 1253 static void 1254 tun_vnethdr_set(struct ifnet *ifp, int vhdrlen) 1255 { 1256 struct tuntap_softc *tp = ifp->if_softc; 1257 1258 TUN_LOCK_ASSERT(tp); 1259 1260 if (tp->tun_vhdrlen == vhdrlen) 1261 return; 1262 1263 /* 1264 * Update if_capabilities to reflect the 1265 * functionalities offered by the virtio-net 1266 * header. 1267 */ 1268 if (vhdrlen != 0) 1269 ifp->if_capabilities |= 1270 TAP_VNET_HDR_CAPS; 1271 else 1272 ifp->if_capabilities &= 1273 ~TAP_VNET_HDR_CAPS; 1274 /* 1275 * Disable any capabilities that we don't 1276 * support anymore. 1277 */ 1278 ifp->if_capenable &= ifp->if_capabilities; 1279 tun_caps_changed(ifp); 1280 tp->tun_vhdrlen = vhdrlen; 1281 1282 TUNDEBUG(ifp, "vnet_hdr_len=%d, if_capabilities=%x\n", 1283 vhdrlen, ifp->if_capabilities); 1284 } 1285 1286 /* 1287 * Process an ioctl request. 1288 */ 1289 static int 1290 tunifioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1291 { 1292 struct ifreq *ifr = (struct ifreq *)data; 1293 struct tuntap_softc *tp; 1294 struct ifstat *ifs; 1295 struct ifmediareq *ifmr; 1296 int dummy, error = 0; 1297 bool l2tun; 1298 1299 ifmr = NULL; 1300 sx_xlock(&tun_ioctl_sx); 1301 tp = ifp->if_softc; 1302 if (tp == NULL) { 1303 error = ENXIO; 1304 goto bad; 1305 } 1306 l2tun = (tp->tun_flags & TUN_L2) != 0; 1307 switch(cmd) { 1308 case SIOCGIFSTATUS: 1309 ifs = (struct ifstat *)data; 1310 TUN_LOCK(tp); 1311 if (tp->tun_pid) 1312 snprintf(ifs->ascii, sizeof(ifs->ascii), 1313 "\tOpened by PID %d\n", tp->tun_pid); 1314 else 1315 ifs->ascii[0] = '\0'; 1316 TUN_UNLOCK(tp); 1317 break; 1318 case SIOCSIFADDR: 1319 if (l2tun) 1320 error = ether_ioctl(ifp, cmd, data); 1321 else 1322 tuninit(ifp); 1323 if (error == 0) 1324 TUNDEBUG(ifp, "address set\n"); 1325 break; 1326 case SIOCSIFMTU: 1327 ifp->if_mtu = ifr->ifr_mtu; 1328 TUNDEBUG(ifp, "mtu set\n"); 1329 break; 1330 case SIOCSIFFLAGS: 1331 case SIOCADDMULTI: 1332 case SIOCDELMULTI: 1333 break; 1334 case SIOCGIFMEDIA: 1335 if (!l2tun) { 1336 error = EINVAL; 1337 break; 1338 } 1339 1340 ifmr = (struct ifmediareq *)data; 1341 dummy = ifmr->ifm_count; 1342 ifmr->ifm_count = 1; 1343 ifmr->ifm_status = IFM_AVALID; 1344 ifmr->ifm_active = IFM_ETHER | IFM_FDX | IFM_1000_T; 1345 if (tp->tun_flags & TUN_OPEN) 1346 ifmr->ifm_status |= IFM_ACTIVE; 1347 ifmr->ifm_current = ifmr->ifm_active; 1348 if (dummy >= 1) { 1349 int media = IFM_ETHER; 1350 error = copyout(&media, ifmr->ifm_ulist, sizeof(int)); 1351 } 1352 break; 1353 case SIOCSIFCAP: 1354 TUN_LOCK(tp); 1355 ifp->if_capenable = ifr->ifr_reqcap; 1356 tun_caps_changed(ifp); 1357 TUN_UNLOCK(tp); 1358 VLAN_CAPABILITIES(ifp); 1359 break; 1360 default: 1361 if (l2tun) { 1362 error = ether_ioctl(ifp, cmd, data); 1363 } else { 1364 error = EINVAL; 1365 } 1366 } 1367 bad: 1368 sx_xunlock(&tun_ioctl_sx); 1369 return (error); 1370 } 1371 1372 /* 1373 * tunoutput - queue packets from higher level ready to put out. 1374 */ 1375 static int 1376 tunoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 1377 struct route *ro) 1378 { 1379 struct tuntap_softc *tp = ifp->if_softc; 1380 u_short cached_tun_flags; 1381 int error; 1382 u_int32_t af; 1383 1384 TUNDEBUG (ifp, "tunoutput\n"); 1385 1386 #ifdef MAC 1387 error = mac_ifnet_check_transmit(ifp, m0); 1388 if (error) { 1389 m_freem(m0); 1390 return (error); 1391 } 1392 #endif 1393 1394 /* Could be unlocked read? */ 1395 TUN_LOCK(tp); 1396 cached_tun_flags = tp->tun_flags; 1397 TUN_UNLOCK(tp); 1398 if ((cached_tun_flags & TUN_READY) != TUN_READY) { 1399 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 1400 m_freem (m0); 1401 return (EHOSTDOWN); 1402 } 1403 1404 if ((ifp->if_flags & IFF_UP) != IFF_UP) { 1405 m_freem (m0); 1406 return (EHOSTDOWN); 1407 } 1408 1409 /* BPF writes need to be handled specially. */ 1410 if (dst->sa_family == AF_UNSPEC || dst->sa_family == pseudo_AF_HDRCMPLT) 1411 bcopy(dst->sa_data, &af, sizeof(af)); 1412 else 1413 af = RO_GET_FAMILY(ro, dst); 1414 1415 BPF_MTAP2(ifp, &af, sizeof(af), m0); 1416 1417 /* prepend sockaddr? this may abort if the mbuf allocation fails */ 1418 if (cached_tun_flags & TUN_LMODE) { 1419 /* allocate space for sockaddr */ 1420 M_PREPEND(m0, dst->sa_len, M_NOWAIT); 1421 1422 /* if allocation failed drop packet */ 1423 if (m0 == NULL) { 1424 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1); 1425 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 1426 return (ENOBUFS); 1427 } else { 1428 bcopy(dst, m0->m_data, dst->sa_len); 1429 } 1430 } 1431 1432 if (cached_tun_flags & TUN_IFHEAD) { 1433 /* Prepend the address family */ 1434 M_PREPEND(m0, 4, M_NOWAIT); 1435 1436 /* if allocation failed drop packet */ 1437 if (m0 == NULL) { 1438 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1); 1439 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 1440 return (ENOBUFS); 1441 } else 1442 *(u_int32_t *)m0->m_data = htonl(af); 1443 } else { 1444 #ifdef INET 1445 if (af != AF_INET) 1446 #endif 1447 { 1448 m_freem(m0); 1449 return (EAFNOSUPPORT); 1450 } 1451 } 1452 1453 error = (ifp->if_transmit)(ifp, m0); 1454 if (error) 1455 return (ENOBUFS); 1456 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 1457 return (0); 1458 } 1459 1460 /* 1461 * the cdevsw interface is now pretty minimal. 1462 */ 1463 static int 1464 tunioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, 1465 struct thread *td) 1466 { 1467 struct ifreq ifr, *ifrp; 1468 struct tuntap_softc *tp = dev->si_drv1; 1469 struct ifnet *ifp = TUN2IFP(tp); 1470 struct tuninfo *tunp; 1471 int error, iflags, ival; 1472 bool l2tun; 1473 1474 l2tun = (tp->tun_flags & TUN_L2) != 0; 1475 if (l2tun) { 1476 /* tap specific ioctls */ 1477 switch(cmd) { 1478 /* VMware/VMnet port ioctl's */ 1479 #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 1480 defined(COMPAT_FREEBSD4) 1481 case _IO('V', 0): 1482 ival = IOCPARM_IVAL(data); 1483 data = (caddr_t)&ival; 1484 /* FALLTHROUGH */ 1485 #endif 1486 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 1487 iflags = *(int *)data; 1488 iflags &= TUN_VMIO_FLAG_MASK; 1489 iflags &= ~IFF_CANTCHANGE; 1490 iflags |= IFF_UP; 1491 1492 TUN_LOCK(tp); 1493 ifp->if_flags = iflags | 1494 (ifp->if_flags & IFF_CANTCHANGE); 1495 TUN_UNLOCK(tp); 1496 1497 return (0); 1498 case SIOCGIFADDR: /* get MAC address of the remote side */ 1499 TUN_LOCK(tp); 1500 bcopy(&tp->tun_ether.octet, data, 1501 sizeof(tp->tun_ether.octet)); 1502 TUN_UNLOCK(tp); 1503 1504 return (0); 1505 case SIOCSIFADDR: /* set MAC address of the remote side */ 1506 TUN_LOCK(tp); 1507 bcopy(data, &tp->tun_ether.octet, 1508 sizeof(tp->tun_ether.octet)); 1509 TUN_UNLOCK(tp); 1510 1511 return (0); 1512 case TAPSVNETHDR: 1513 ival = *(int *)data; 1514 if (ival != 0 && 1515 ival != sizeof(struct virtio_net_hdr) && 1516 ival != sizeof(struct virtio_net_hdr_mrg_rxbuf)) { 1517 return (EINVAL); 1518 } 1519 TUN_LOCK(tp); 1520 tun_vnethdr_set(ifp, ival); 1521 TUN_UNLOCK(tp); 1522 1523 return (0); 1524 case TAPGVNETHDR: 1525 TUN_LOCK(tp); 1526 *(int *)data = tp->tun_vhdrlen; 1527 TUN_UNLOCK(tp); 1528 1529 return (0); 1530 } 1531 1532 /* Fall through to the common ioctls if unhandled */ 1533 } else { 1534 switch (cmd) { 1535 case TUNSLMODE: 1536 TUN_LOCK(tp); 1537 if (*(int *)data) { 1538 tp->tun_flags |= TUN_LMODE; 1539 tp->tun_flags &= ~TUN_IFHEAD; 1540 } else 1541 tp->tun_flags &= ~TUN_LMODE; 1542 TUN_UNLOCK(tp); 1543 1544 return (0); 1545 case TUNSIFHEAD: 1546 TUN_LOCK(tp); 1547 if (*(int *)data) { 1548 tp->tun_flags |= TUN_IFHEAD; 1549 tp->tun_flags &= ~TUN_LMODE; 1550 } else 1551 tp->tun_flags &= ~TUN_IFHEAD; 1552 TUN_UNLOCK(tp); 1553 1554 return (0); 1555 case TUNGIFHEAD: 1556 TUN_LOCK(tp); 1557 *(int *)data = (tp->tun_flags & TUN_IFHEAD) ? 1 : 0; 1558 TUN_UNLOCK(tp); 1559 1560 return (0); 1561 case TUNSIFMODE: 1562 /* deny this if UP */ 1563 if (TUN2IFP(tp)->if_flags & IFF_UP) 1564 return (EBUSY); 1565 1566 switch (*(int *)data & ~IFF_MULTICAST) { 1567 case IFF_POINTOPOINT: 1568 case IFF_BROADCAST: 1569 TUN_LOCK(tp); 1570 TUN2IFP(tp)->if_flags &= 1571 ~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST); 1572 TUN2IFP(tp)->if_flags |= *(int *)data; 1573 TUN_UNLOCK(tp); 1574 1575 break; 1576 default: 1577 return (EINVAL); 1578 } 1579 1580 return (0); 1581 case TUNSIFPID: 1582 TUN_LOCK(tp); 1583 tp->tun_pid = curthread->td_proc->p_pid; 1584 TUN_UNLOCK(tp); 1585 1586 return (0); 1587 } 1588 /* Fall through to the common ioctls if unhandled */ 1589 } 1590 1591 switch (cmd) { 1592 case TUNGIFNAME: 1593 ifrp = (struct ifreq *)data; 1594 strlcpy(ifrp->ifr_name, TUN2IFP(tp)->if_xname, IFNAMSIZ); 1595 1596 return (0); 1597 case TUNSIFINFO: 1598 tunp = (struct tuninfo *)data; 1599 if (TUN2IFP(tp)->if_type != tunp->type) 1600 return (EPROTOTYPE); 1601 TUN_LOCK(tp); 1602 if (TUN2IFP(tp)->if_mtu != tunp->mtu) { 1603 strlcpy(ifr.ifr_name, if_name(TUN2IFP(tp)), IFNAMSIZ); 1604 ifr.ifr_mtu = tunp->mtu; 1605 CURVNET_SET(TUN2IFP(tp)->if_vnet); 1606 error = ifhwioctl(SIOCSIFMTU, TUN2IFP(tp), 1607 (caddr_t)&ifr, td); 1608 CURVNET_RESTORE(); 1609 if (error) { 1610 TUN_UNLOCK(tp); 1611 return (error); 1612 } 1613 } 1614 TUN2IFP(tp)->if_baudrate = tunp->baudrate; 1615 TUN_UNLOCK(tp); 1616 break; 1617 case TUNGIFINFO: 1618 tunp = (struct tuninfo *)data; 1619 TUN_LOCK(tp); 1620 tunp->mtu = TUN2IFP(tp)->if_mtu; 1621 tunp->type = TUN2IFP(tp)->if_type; 1622 tunp->baudrate = TUN2IFP(tp)->if_baudrate; 1623 TUN_UNLOCK(tp); 1624 break; 1625 case TUNSDEBUG: 1626 tundebug = *(int *)data; 1627 break; 1628 case TUNGDEBUG: 1629 *(int *)data = tundebug; 1630 break; 1631 case FIONBIO: 1632 break; 1633 case FIOASYNC: 1634 TUN_LOCK(tp); 1635 if (*(int *)data) 1636 tp->tun_flags |= TUN_ASYNC; 1637 else 1638 tp->tun_flags &= ~TUN_ASYNC; 1639 TUN_UNLOCK(tp); 1640 break; 1641 case FIONREAD: 1642 if (!IFQ_IS_EMPTY(&TUN2IFP(tp)->if_snd)) { 1643 struct mbuf *mb; 1644 IFQ_LOCK(&TUN2IFP(tp)->if_snd); 1645 IFQ_POLL_NOLOCK(&TUN2IFP(tp)->if_snd, mb); 1646 for (*(int *)data = 0; mb != NULL; mb = mb->m_next) 1647 *(int *)data += mb->m_len; 1648 IFQ_UNLOCK(&TUN2IFP(tp)->if_snd); 1649 } else 1650 *(int *)data = 0; 1651 break; 1652 case FIOSETOWN: 1653 return (fsetown(*(int *)data, &tp->tun_sigio)); 1654 1655 case FIOGETOWN: 1656 *(int *)data = fgetown(&tp->tun_sigio); 1657 return (0); 1658 1659 /* This is deprecated, FIOSETOWN should be used instead. */ 1660 case TIOCSPGRP: 1661 return (fsetown(-(*(int *)data), &tp->tun_sigio)); 1662 1663 /* This is deprecated, FIOGETOWN should be used instead. */ 1664 case TIOCGPGRP: 1665 *(int *)data = -fgetown(&tp->tun_sigio); 1666 return (0); 1667 1668 default: 1669 return (ENOTTY); 1670 } 1671 return (0); 1672 } 1673 1674 /* 1675 * The cdevsw read interface - reads a packet at a time, or at 1676 * least as much of a packet as can be read. 1677 */ 1678 static int 1679 tunread(struct cdev *dev, struct uio *uio, int flag) 1680 { 1681 struct tuntap_softc *tp = dev->si_drv1; 1682 struct ifnet *ifp = TUN2IFP(tp); 1683 struct mbuf *m; 1684 size_t len; 1685 int error = 0; 1686 1687 TUNDEBUG (ifp, "read\n"); 1688 TUN_LOCK(tp); 1689 if ((tp->tun_flags & TUN_READY) != TUN_READY) { 1690 TUN_UNLOCK(tp); 1691 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 1692 return (EHOSTDOWN); 1693 } 1694 1695 tp->tun_flags &= ~TUN_RWAIT; 1696 1697 for (;;) { 1698 IFQ_DEQUEUE(&ifp->if_snd, m); 1699 if (m != NULL) 1700 break; 1701 if (flag & O_NONBLOCK) { 1702 TUN_UNLOCK(tp); 1703 return (EWOULDBLOCK); 1704 } 1705 tp->tun_flags |= TUN_RWAIT; 1706 error = mtx_sleep(tp, &tp->tun_mtx, PCATCH | (PZERO + 1), 1707 "tunread", 0); 1708 if (error != 0) { 1709 TUN_UNLOCK(tp); 1710 return (error); 1711 } 1712 } 1713 TUN_UNLOCK(tp); 1714 1715 len = min(tp->tun_vhdrlen, uio->uio_resid); 1716 if (len > 0) { 1717 struct virtio_net_hdr_mrg_rxbuf vhdr; 1718 1719 bzero(&vhdr, sizeof(vhdr)); 1720 if (m->m_pkthdr.csum_flags & TAP_ALL_OFFLOAD) { 1721 m = virtio_net_tx_offload(ifp, m, false, &vhdr.hdr); 1722 } 1723 1724 TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, " 1725 "gs %u, cs %u, co %u\n", vhdr.hdr.flags, 1726 vhdr.hdr.gso_type, vhdr.hdr.hdr_len, 1727 vhdr.hdr.gso_size, vhdr.hdr.csum_start, 1728 vhdr.hdr.csum_offset); 1729 error = uiomove(&vhdr, len, uio); 1730 } 1731 if (error == 0) 1732 error = m_mbuftouio(uio, m, 0); 1733 m_freem(m); 1734 return (error); 1735 } 1736 1737 static int 1738 tunwrite_l2(struct tuntap_softc *tp, struct mbuf *m, 1739 struct virtio_net_hdr_mrg_rxbuf *vhdr) 1740 { 1741 struct epoch_tracker et; 1742 struct ether_header *eh; 1743 struct ifnet *ifp; 1744 1745 ifp = TUN2IFP(tp); 1746 1747 /* 1748 * Only pass a unicast frame to ether_input(), if it would 1749 * actually have been received by non-virtual hardware. 1750 */ 1751 if (m->m_len < sizeof(struct ether_header)) { 1752 m_freem(m); 1753 return (0); 1754 } 1755 1756 eh = mtod(m, struct ether_header *); 1757 1758 if ((ifp->if_flags & IFF_PROMISC) == 0 && 1759 !ETHER_IS_MULTICAST(eh->ether_dhost) && 1760 bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) { 1761 m_freem(m); 1762 return (0); 1763 } 1764 1765 if (vhdr != NULL) { 1766 if (virtio_net_rx_csum(m, &vhdr->hdr)) { 1767 m_freem(m); 1768 return (0); 1769 } 1770 } else { 1771 switch (ntohs(eh->ether_type)) { 1772 #ifdef INET 1773 case ETHERTYPE_IP: 1774 if (ifp->if_capenable & IFCAP_RXCSUM) { 1775 m->m_pkthdr.csum_flags |= 1776 CSUM_IP_CHECKED | CSUM_IP_VALID | 1777 CSUM_DATA_VALID | CSUM_SCTP_VALID | 1778 CSUM_PSEUDO_HDR; 1779 m->m_pkthdr.csum_data = 0xffff; 1780 } 1781 break; 1782 #endif 1783 #ifdef INET6 1784 case ETHERTYPE_IPV6: 1785 if (ifp->if_capenable & IFCAP_RXCSUM_IPV6) { 1786 m->m_pkthdr.csum_flags |= 1787 CSUM_DATA_VALID_IPV6 | CSUM_SCTP_VALID | 1788 CSUM_PSEUDO_HDR; 1789 m->m_pkthdr.csum_data = 0xffff; 1790 } 1791 break; 1792 #endif 1793 } 1794 } 1795 1796 /* Pass packet up to parent. */ 1797 CURVNET_SET(ifp->if_vnet); 1798 NET_EPOCH_ENTER(et); 1799 #if defined(INET) || defined(INET6) 1800 if (tp->tun_lro_ready && ifp->if_capenable & IFCAP_LRO && 1801 tcp_lro_rx(&tp->tun_lro, m, 0) == 0) 1802 tcp_lro_flush_all(&tp->tun_lro); 1803 else 1804 #endif 1805 (*ifp->if_input)(ifp, m); 1806 NET_EPOCH_EXIT(et); 1807 CURVNET_RESTORE(); 1808 /* ibytes are counted in parent */ 1809 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 1810 return (0); 1811 } 1812 1813 static int 1814 tunwrite_l3(struct tuntap_softc *tp, struct mbuf *m) 1815 { 1816 struct epoch_tracker et; 1817 struct ifnet *ifp; 1818 int family, isr; 1819 1820 ifp = TUN2IFP(tp); 1821 /* Could be unlocked read? */ 1822 TUN_LOCK(tp); 1823 if (tp->tun_flags & TUN_IFHEAD) { 1824 TUN_UNLOCK(tp); 1825 if (m->m_len < sizeof(family) && 1826 (m = m_pullup(m, sizeof(family))) == NULL) 1827 return (ENOBUFS); 1828 family = ntohl(*mtod(m, u_int32_t *)); 1829 m_adj(m, sizeof(family)); 1830 } else { 1831 TUN_UNLOCK(tp); 1832 family = AF_INET; 1833 } 1834 1835 BPF_MTAP2(ifp, &family, sizeof(family), m); 1836 1837 switch (family) { 1838 #ifdef INET 1839 case AF_INET: 1840 isr = NETISR_IP; 1841 break; 1842 #endif 1843 #ifdef INET6 1844 case AF_INET6: 1845 isr = NETISR_IPV6; 1846 break; 1847 #endif 1848 default: 1849 m_freem(m); 1850 return (EAFNOSUPPORT); 1851 } 1852 random_harvest_queue(m, sizeof(*m), RANDOM_NET_TUN); 1853 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 1854 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 1855 CURVNET_SET(ifp->if_vnet); 1856 M_SETFIB(m, ifp->if_fib); 1857 NET_EPOCH_ENTER(et); 1858 netisr_dispatch(isr, m); 1859 NET_EPOCH_EXIT(et); 1860 CURVNET_RESTORE(); 1861 return (0); 1862 } 1863 1864 /* 1865 * the cdevsw write interface - an atomic write is a packet - or else! 1866 */ 1867 static int 1868 tunwrite(struct cdev *dev, struct uio *uio, int flag) 1869 { 1870 struct virtio_net_hdr_mrg_rxbuf vhdr; 1871 struct tuntap_softc *tp; 1872 struct ifnet *ifp; 1873 struct mbuf *m; 1874 uint32_t mru; 1875 int align, vhdrlen, error; 1876 bool l2tun; 1877 1878 tp = dev->si_drv1; 1879 ifp = TUN2IFP(tp); 1880 TUNDEBUG(ifp, "tunwrite\n"); 1881 if ((ifp->if_flags & IFF_UP) != IFF_UP) 1882 /* ignore silently */ 1883 return (0); 1884 1885 if (uio->uio_resid == 0) 1886 return (0); 1887 1888 l2tun = (tp->tun_flags & TUN_L2) != 0; 1889 mru = l2tun ? TAPMRU : TUNMRU; 1890 vhdrlen = tp->tun_vhdrlen; 1891 align = 0; 1892 if (l2tun) { 1893 align = ETHER_ALIGN; 1894 mru += vhdrlen; 1895 } else if ((tp->tun_flags & TUN_IFHEAD) != 0) 1896 mru += sizeof(uint32_t); /* family */ 1897 if (uio->uio_resid < 0 || uio->uio_resid > mru) { 1898 TUNDEBUG(ifp, "len=%zd!\n", uio->uio_resid); 1899 return (EIO); 1900 } 1901 1902 if (vhdrlen > 0) { 1903 error = uiomove(&vhdr, vhdrlen, uio); 1904 if (error != 0) 1905 return (error); 1906 TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, " 1907 "gs %u, cs %u, co %u\n", vhdr.hdr.flags, 1908 vhdr.hdr.gso_type, vhdr.hdr.hdr_len, 1909 vhdr.hdr.gso_size, vhdr.hdr.csum_start, 1910 vhdr.hdr.csum_offset); 1911 } 1912 1913 if ((m = m_uiotombuf(uio, M_NOWAIT, 0, align, M_PKTHDR)) == NULL) { 1914 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 1915 return (ENOBUFS); 1916 } 1917 1918 m->m_pkthdr.rcvif = ifp; 1919 #ifdef MAC 1920 mac_ifnet_create_mbuf(ifp, m); 1921 #endif 1922 1923 if (l2tun) 1924 return (tunwrite_l2(tp, m, vhdrlen > 0 ? &vhdr : NULL)); 1925 1926 return (tunwrite_l3(tp, m)); 1927 } 1928 1929 /* 1930 * tunpoll - the poll interface, this is only useful on reads 1931 * really. The write detect always returns true, write never blocks 1932 * anyway, it either accepts the packet or drops it. 1933 */ 1934 static int 1935 tunpoll(struct cdev *dev, int events, struct thread *td) 1936 { 1937 struct tuntap_softc *tp = dev->si_drv1; 1938 struct ifnet *ifp = TUN2IFP(tp); 1939 int revents = 0; 1940 1941 TUNDEBUG(ifp, "tunpoll\n"); 1942 1943 if (events & (POLLIN | POLLRDNORM)) { 1944 IFQ_LOCK(&ifp->if_snd); 1945 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 1946 TUNDEBUG(ifp, "tunpoll q=%d\n", ifp->if_snd.ifq_len); 1947 revents |= events & (POLLIN | POLLRDNORM); 1948 } else { 1949 TUNDEBUG(ifp, "tunpoll waiting\n"); 1950 selrecord(td, &tp->tun_rsel); 1951 } 1952 IFQ_UNLOCK(&ifp->if_snd); 1953 } 1954 revents |= events & (POLLOUT | POLLWRNORM); 1955 1956 return (revents); 1957 } 1958 1959 /* 1960 * tunkqfilter - support for the kevent() system call. 1961 */ 1962 static int 1963 tunkqfilter(struct cdev *dev, struct knote *kn) 1964 { 1965 struct tuntap_softc *tp = dev->si_drv1; 1966 struct ifnet *ifp = TUN2IFP(tp); 1967 1968 switch(kn->kn_filter) { 1969 case EVFILT_READ: 1970 TUNDEBUG(ifp, "%s kqfilter: EVFILT_READ, minor = %#x\n", 1971 ifp->if_xname, dev2unit(dev)); 1972 kn->kn_fop = &tun_read_filterops; 1973 break; 1974 1975 case EVFILT_WRITE: 1976 TUNDEBUG(ifp, "%s kqfilter: EVFILT_WRITE, minor = %#x\n", 1977 ifp->if_xname, dev2unit(dev)); 1978 kn->kn_fop = &tun_write_filterops; 1979 break; 1980 1981 default: 1982 TUNDEBUG(ifp, "%s kqfilter: invalid filter, minor = %#x\n", 1983 ifp->if_xname, dev2unit(dev)); 1984 return(EINVAL); 1985 } 1986 1987 kn->kn_hook = tp; 1988 knlist_add(&tp->tun_rsel.si_note, kn, 0); 1989 1990 return (0); 1991 } 1992 1993 /* 1994 * Return true of there is data in the interface queue. 1995 */ 1996 static int 1997 tunkqread(struct knote *kn, long hint) 1998 { 1999 int ret; 2000 struct tuntap_softc *tp = kn->kn_hook; 2001 struct cdev *dev = tp->tun_dev; 2002 struct ifnet *ifp = TUN2IFP(tp); 2003 2004 if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) { 2005 TUNDEBUG(ifp, 2006 "%s have data in the queue. Len = %d, minor = %#x\n", 2007 ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev)); 2008 ret = 1; 2009 } else { 2010 TUNDEBUG(ifp, 2011 "%s waiting for data, minor = %#x\n", ifp->if_xname, 2012 dev2unit(dev)); 2013 ret = 0; 2014 } 2015 2016 return (ret); 2017 } 2018 2019 /* 2020 * Always can write, always return MTU in kn->data. 2021 */ 2022 static int 2023 tunkqwrite(struct knote *kn, long hint) 2024 { 2025 struct tuntap_softc *tp = kn->kn_hook; 2026 struct ifnet *ifp = TUN2IFP(tp); 2027 2028 kn->kn_data = ifp->if_mtu; 2029 2030 return (1); 2031 } 2032 2033 static void 2034 tunkqdetach(struct knote *kn) 2035 { 2036 struct tuntap_softc *tp = kn->kn_hook; 2037 2038 knlist_remove(&tp->tun_rsel.si_note, kn, 0); 2039 } 2040