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sys/net/if_tuntap.c
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1 /* $NetBSD: if_tun.c,v 1.14 1994/06/29 06:36:25 cgd Exp $ */ 2 /*- 3 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 4 * 5 * Copyright (C) 1999-2000 by Maksim Yevmenkin <m_evmenkin@yahoo.com> 6 * All rights reserved. 7 * Copyright (c) 2019 Kyle Evans <kevans@FreeBSD.org> 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * BASED ON: 32 * ------------------------------------------------------------------------- 33 * 34 * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk> 35 * Nottingham University 1987. 36 * 37 * This source may be freely distributed, however I would be interested 38 * in any changes that are made. 39 * 40 * This driver takes packets off the IP i/f and hands them up to a 41 * user process to have its wicked way with. This driver has it's 42 * roots in a similar driver written by Phil Cockcroft (formerly) at 43 * UCL. This driver is based much more on read/write/poll mode of 44 * operation though. 45 * 46 * $FreeBSD$ 47 */ 48 49 #include "opt_inet.h" 50 #include "opt_inet6.h" 51 52 #include <sys/param.h> 53 #include <sys/lock.h> 54 #include <sys/priv.h> 55 #include <sys/proc.h> 56 #include <sys/systm.h> 57 #include <sys/jail.h> 58 #include <sys/mbuf.h> 59 #include <sys/module.h> 60 #include <sys/socket.h> 61 #include <sys/eventhandler.h> 62 #include <sys/fcntl.h> 63 #include <sys/filio.h> 64 #include <sys/sockio.h> 65 #include <sys/sx.h> 66 #include <sys/syslog.h> 67 #include <sys/ttycom.h> 68 #include <sys/poll.h> 69 #include <sys/selinfo.h> 70 #include <sys/signalvar.h> 71 #include <sys/filedesc.h> 72 #include <sys/kernel.h> 73 #include <sys/sysctl.h> 74 #include <sys/conf.h> 75 #include <sys/uio.h> 76 #include <sys/malloc.h> 77 #include <sys/random.h> 78 #include <sys/ctype.h> 79 80 #include <net/ethernet.h> 81 #include <net/if.h> 82 #include <net/if_var.h> 83 #include <net/if_clone.h> 84 #include <net/if_dl.h> 85 #include <net/if_media.h> 86 #include <net/if_private.h> 87 #include <net/if_types.h> 88 #include <net/if_vlan_var.h> 89 #include <net/netisr.h> 90 #include <net/route.h> 91 #include <net/vnet.h> 92 #include <netinet/in.h> 93 #ifdef INET 94 #include <netinet/ip.h> 95 #endif 96 #ifdef INET6 97 #include <netinet/ip6.h> 98 #include <netinet6/ip6_var.h> 99 #endif 100 #include <netinet/udp.h> 101 #include <netinet/tcp.h> 102 #include <net/bpf.h> 103 #include <net/if_tap.h> 104 #include <net/if_tun.h> 105 106 #include <dev/virtio/network/virtio_net.h> 107 108 #include <sys/queue.h> 109 #include <sys/condvar.h> 110 #include <security/mac/mac_framework.h> 111 112 struct tuntap_driver; 113 114 /* 115 * tun_list is protected by global tunmtx. Other mutable fields are 116 * protected by tun->tun_mtx, or by their owning subsystem. tun_dev is 117 * static for the duration of a tunnel interface. 118 */ 119 struct tuntap_softc { 120 TAILQ_ENTRY(tuntap_softc) tun_list; 121 struct cdev *tun_alias; 122 struct cdev *tun_dev; 123 u_short tun_flags; /* misc flags */ 124 #define TUN_OPEN 0x0001 125 #define TUN_INITED 0x0002 126 #define TUN_UNUSED1 0x0008 127 #define TUN_UNUSED2 0x0010 128 #define TUN_LMODE 0x0020 129 #define TUN_RWAIT 0x0040 130 #define TUN_ASYNC 0x0080 131 #define TUN_IFHEAD 0x0100 132 #define TUN_DYING 0x0200 133 #define TUN_L2 0x0400 134 #define TUN_VMNET 0x0800 135 136 #define TUN_DRIVER_IDENT_MASK (TUN_L2 | TUN_VMNET) 137 #define TUN_READY (TUN_OPEN | TUN_INITED) 138 139 pid_t tun_pid; /* owning pid */ 140 struct ifnet *tun_ifp; /* the interface */ 141 struct sigio *tun_sigio; /* async I/O info */ 142 struct tuntap_driver *tun_drv; /* appropriate driver */ 143 struct selinfo tun_rsel; /* read select */ 144 struct mtx tun_mtx; /* softc field mutex */ 145 struct cv tun_cv; /* for ref'd dev destroy */ 146 struct ether_addr tun_ether; /* remote address */ 147 int tun_busy; /* busy count */ 148 int tun_vhdrlen; /* virtio-net header length */ 149 }; 150 #define TUN2IFP(sc) ((sc)->tun_ifp) 151 152 #define TUNDEBUG if (tundebug) if_printf 153 154 #define TUN_LOCK(tp) mtx_lock(&(tp)->tun_mtx) 155 #define TUN_UNLOCK(tp) mtx_unlock(&(tp)->tun_mtx) 156 #define TUN_LOCK_ASSERT(tp) mtx_assert(&(tp)->tun_mtx, MA_OWNED); 157 158 #define TUN_VMIO_FLAG_MASK 0x0fff 159 160 /* 161 * Interface capabilities of a tap device that supports the virtio-net 162 * header. 163 */ 164 #define TAP_VNET_HDR_CAPS (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6 \ 165 | IFCAP_VLAN_HWCSUM \ 166 | IFCAP_TSO | IFCAP_LRO \ 167 | IFCAP_VLAN_HWTSO) 168 169 #define TAP_ALL_OFFLOAD (CSUM_TSO | CSUM_TCP | CSUM_UDP |\ 170 CSUM_TCP_IPV6 | CSUM_UDP_IPV6) 171 172 /* 173 * All mutable global variables in if_tun are locked using tunmtx, with 174 * the exception of tundebug, which is used unlocked, and the drivers' *clones, 175 * which are static after setup. 176 */ 177 static struct mtx tunmtx; 178 static eventhandler_tag arrival_tag; 179 static eventhandler_tag clone_tag; 180 static const char tunname[] = "tun"; 181 static const char tapname[] = "tap"; 182 static const char vmnetname[] = "vmnet"; 183 static MALLOC_DEFINE(M_TUN, tunname, "Tunnel Interface"); 184 static int tundebug = 0; 185 static int tundclone = 1; 186 static int tap_allow_uopen = 0; /* allow user devfs cloning */ 187 static int tapuponopen = 0; /* IFF_UP on open() */ 188 static int tapdclone = 1; /* enable devfs cloning */ 189 190 static TAILQ_HEAD(,tuntap_softc) tunhead = TAILQ_HEAD_INITIALIZER(tunhead); 191 SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, ""); 192 193 static struct sx tun_ioctl_sx; 194 SX_SYSINIT(tun_ioctl_sx, &tun_ioctl_sx, "tun_ioctl"); 195 196 SYSCTL_DECL(_net_link); 197 /* tun */ 198 static SYSCTL_NODE(_net_link, OID_AUTO, tun, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 199 "IP tunnel software network interface"); 200 SYSCTL_INT(_net_link_tun, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tundclone, 0, 201 "Enable legacy devfs interface creation"); 202 203 /* tap */ 204 static SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 205 "Ethernet tunnel software network interface"); 206 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tap_allow_uopen, 0, 207 "Enable legacy devfs interface creation for all users"); 208 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0, 209 "Bring interface up when /dev/tap is opened"); 210 SYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tapdclone, 0, 211 "Enable legacy devfs interface creation"); 212 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tundebug, 0, ""); 213 214 static int tun_create_device(struct tuntap_driver *drv, int unit, 215 struct ucred *cr, struct cdev **dev, const char *name); 216 static int tun_busy_locked(struct tuntap_softc *tp); 217 static void tun_unbusy_locked(struct tuntap_softc *tp); 218 static int tun_busy(struct tuntap_softc *tp); 219 static void tun_unbusy(struct tuntap_softc *tp); 220 221 static int tuntap_name2info(const char *name, int *unit, int *flags); 222 static void tunclone(void *arg, struct ucred *cred, char *name, 223 int namelen, struct cdev **dev); 224 static void tuncreate(struct cdev *dev); 225 static void tundtor(void *data); 226 static void tunrename(void *arg, struct ifnet *ifp); 227 static int tunifioctl(struct ifnet *, u_long, caddr_t); 228 static void tuninit(struct ifnet *); 229 static void tunifinit(void *xtp); 230 static int tuntapmodevent(module_t, int, void *); 231 static int tunoutput(struct ifnet *, struct mbuf *, 232 const struct sockaddr *, struct route *ro); 233 static void tunstart(struct ifnet *); 234 static void tunstart_l2(struct ifnet *); 235 236 static int tun_clone_match(struct if_clone *ifc, const char *name); 237 static int tap_clone_match(struct if_clone *ifc, const char *name); 238 static int vmnet_clone_match(struct if_clone *ifc, const char *name); 239 static int tun_clone_create(struct if_clone *, char *, size_t, 240 struct ifc_data *, struct ifnet **); 241 static int tun_clone_destroy(struct if_clone *, struct ifnet *, uint32_t); 242 static void tun_vnethdr_set(struct ifnet *ifp, int vhdrlen); 243 244 static d_open_t tunopen; 245 static d_read_t tunread; 246 static d_write_t tunwrite; 247 static d_ioctl_t tunioctl; 248 static d_poll_t tunpoll; 249 static d_kqfilter_t tunkqfilter; 250 251 static int tunkqread(struct knote *, long); 252 static int tunkqwrite(struct knote *, long); 253 static void tunkqdetach(struct knote *); 254 255 static struct filterops tun_read_filterops = { 256 .f_isfd = 1, 257 .f_attach = NULL, 258 .f_detach = tunkqdetach, 259 .f_event = tunkqread, 260 }; 261 262 static struct filterops tun_write_filterops = { 263 .f_isfd = 1, 264 .f_attach = NULL, 265 .f_detach = tunkqdetach, 266 .f_event = tunkqwrite, 267 }; 268 269 static struct tuntap_driver { 270 struct cdevsw cdevsw; 271 int ident_flags; 272 struct unrhdr *unrhdr; 273 struct clonedevs *clones; 274 ifc_match_f *clone_match_fn; 275 ifc_create_f *clone_create_fn; 276 ifc_destroy_f *clone_destroy_fn; 277 } tuntap_drivers[] = { 278 { 279 .ident_flags = 0, 280 .cdevsw = { 281 .d_version = D_VERSION, 282 .d_flags = D_NEEDMINOR, 283 .d_open = tunopen, 284 .d_read = tunread, 285 .d_write = tunwrite, 286 .d_ioctl = tunioctl, 287 .d_poll = tunpoll, 288 .d_kqfilter = tunkqfilter, 289 .d_name = tunname, 290 }, 291 .clone_match_fn = tun_clone_match, 292 .clone_create_fn = tun_clone_create, 293 .clone_destroy_fn = tun_clone_destroy, 294 }, 295 { 296 .ident_flags = TUN_L2, 297 .cdevsw = { 298 .d_version = D_VERSION, 299 .d_flags = D_NEEDMINOR, 300 .d_open = tunopen, 301 .d_read = tunread, 302 .d_write = tunwrite, 303 .d_ioctl = tunioctl, 304 .d_poll = tunpoll, 305 .d_kqfilter = tunkqfilter, 306 .d_name = tapname, 307 }, 308 .clone_match_fn = tap_clone_match, 309 .clone_create_fn = tun_clone_create, 310 .clone_destroy_fn = tun_clone_destroy, 311 }, 312 { 313 .ident_flags = TUN_L2 | TUN_VMNET, 314 .cdevsw = { 315 .d_version = D_VERSION, 316 .d_flags = D_NEEDMINOR, 317 .d_open = tunopen, 318 .d_read = tunread, 319 .d_write = tunwrite, 320 .d_ioctl = tunioctl, 321 .d_poll = tunpoll, 322 .d_kqfilter = tunkqfilter, 323 .d_name = vmnetname, 324 }, 325 .clone_match_fn = vmnet_clone_match, 326 .clone_create_fn = tun_clone_create, 327 .clone_destroy_fn = tun_clone_destroy, 328 }, 329 }; 330 331 struct tuntap_driver_cloner { 332 SLIST_ENTRY(tuntap_driver_cloner) link; 333 struct tuntap_driver *drv; 334 struct if_clone *cloner; 335 }; 336 337 VNET_DEFINE_STATIC(SLIST_HEAD(, tuntap_driver_cloner), tuntap_driver_cloners) = 338 SLIST_HEAD_INITIALIZER(tuntap_driver_cloners); 339 340 #define V_tuntap_driver_cloners VNET(tuntap_driver_cloners) 341 342 /* 343 * Mechanism for marking a tunnel device as busy so that we can safely do some 344 * orthogonal operations (such as operations on devices) without racing against 345 * tun_destroy. tun_destroy will wait on the condvar if we're at all busy or 346 * open, to be woken up when the condition is alleviated. 347 */ 348 static int 349 tun_busy_locked(struct tuntap_softc *tp) 350 { 351 352 TUN_LOCK_ASSERT(tp); 353 if ((tp->tun_flags & TUN_DYING) != 0) { 354 /* 355 * Perhaps unintuitive, but the device is busy going away. 356 * Other interpretations of EBUSY from tun_busy make little 357 * sense, since making a busy device even more busy doesn't 358 * sound like a problem. 359 */ 360 return (EBUSY); 361 } 362 363 ++tp->tun_busy; 364 return (0); 365 } 366 367 static void 368 tun_unbusy_locked(struct tuntap_softc *tp) 369 { 370 371 TUN_LOCK_ASSERT(tp); 372 KASSERT(tp->tun_busy != 0, ("tun_unbusy: called for non-busy tunnel")); 373 374 --tp->tun_busy; 375 /* Wake up anything that may be waiting on our busy tunnel. */ 376 if (tp->tun_busy == 0) 377 cv_broadcast(&tp->tun_cv); 378 } 379 380 static int 381 tun_busy(struct tuntap_softc *tp) 382 { 383 int ret; 384 385 TUN_LOCK(tp); 386 ret = tun_busy_locked(tp); 387 TUN_UNLOCK(tp); 388 return (ret); 389 } 390 391 static void 392 tun_unbusy(struct tuntap_softc *tp) 393 { 394 395 TUN_LOCK(tp); 396 tun_unbusy_locked(tp); 397 TUN_UNLOCK(tp); 398 } 399 400 /* 401 * Sets unit and/or flags given the device name. Must be called with correct 402 * vnet context. 403 */ 404 static int 405 tuntap_name2info(const char *name, int *outunit, int *outflags) 406 { 407 struct tuntap_driver *drv; 408 struct tuntap_driver_cloner *drvc; 409 char *dname; 410 int flags, unit; 411 bool found; 412 413 if (name == NULL) 414 return (EINVAL); 415 416 /* 417 * Needed for dev_stdclone, but dev_stdclone will not modify, it just 418 * wants to be able to pass back a char * through the second param. We 419 * will always set that as NULL here, so we'll fake it. 420 */ 421 dname = __DECONST(char *, name); 422 found = false; 423 424 KASSERT(!SLIST_EMPTY(&V_tuntap_driver_cloners), 425 ("tuntap_driver_cloners failed to initialize")); 426 SLIST_FOREACH(drvc, &V_tuntap_driver_cloners, link) { 427 KASSERT(drvc->drv != NULL, 428 ("tuntap_driver_cloners entry not properly initialized")); 429 drv = drvc->drv; 430 431 if (strcmp(name, drv->cdevsw.d_name) == 0) { 432 found = true; 433 unit = -1; 434 flags = drv->ident_flags; 435 break; 436 } 437 438 if (dev_stdclone(dname, NULL, drv->cdevsw.d_name, &unit) == 1) { 439 found = true; 440 flags = drv->ident_flags; 441 break; 442 } 443 } 444 445 if (!found) 446 return (ENXIO); 447 448 if (outunit != NULL) 449 *outunit = unit; 450 if (outflags != NULL) 451 *outflags = flags; 452 return (0); 453 } 454 455 /* 456 * Get driver information from a set of flags specified. Masks the identifying 457 * part of the flags and compares it against all of the available 458 * tuntap_drivers. Must be called with correct vnet context. 459 */ 460 static struct tuntap_driver * 461 tuntap_driver_from_flags(int tun_flags) 462 { 463 struct tuntap_driver *drv; 464 struct tuntap_driver_cloner *drvc; 465 466 KASSERT(!SLIST_EMPTY(&V_tuntap_driver_cloners), 467 ("tuntap_driver_cloners failed to initialize")); 468 SLIST_FOREACH(drvc, &V_tuntap_driver_cloners, link) { 469 KASSERT(drvc->drv != NULL, 470 ("tuntap_driver_cloners entry not properly initialized")); 471 drv = drvc->drv; 472 if ((tun_flags & TUN_DRIVER_IDENT_MASK) == drv->ident_flags) 473 return (drv); 474 } 475 476 return (NULL); 477 } 478 479 static int 480 tun_clone_match(struct if_clone *ifc, const char *name) 481 { 482 int tunflags; 483 484 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 485 if ((tunflags & TUN_L2) == 0) 486 return (1); 487 } 488 489 return (0); 490 } 491 492 static int 493 tap_clone_match(struct if_clone *ifc, const char *name) 494 { 495 int tunflags; 496 497 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 498 if ((tunflags & (TUN_L2 | TUN_VMNET)) == TUN_L2) 499 return (1); 500 } 501 502 return (0); 503 } 504 505 static int 506 vmnet_clone_match(struct if_clone *ifc, const char *name) 507 { 508 int tunflags; 509 510 if (tuntap_name2info(name, NULL, &tunflags) == 0) { 511 if ((tunflags & TUN_VMNET) != 0) 512 return (1); 513 } 514 515 return (0); 516 } 517 518 static int 519 tun_clone_create(struct if_clone *ifc, char *name, size_t len, 520 struct ifc_data *ifd, struct ifnet **ifpp) 521 { 522 struct tuntap_driver *drv; 523 struct cdev *dev; 524 int err, i, tunflags, unit; 525 526 tunflags = 0; 527 /* The name here tells us exactly what we're creating */ 528 err = tuntap_name2info(name, &unit, &tunflags); 529 if (err != 0) 530 return (err); 531 532 drv = tuntap_driver_from_flags(tunflags); 533 if (drv == NULL) 534 return (ENXIO); 535 536 if (unit != -1) { 537 /* If this unit number is still available that's okay. */ 538 if (alloc_unr_specific(drv->unrhdr, unit) == -1) 539 return (EEXIST); 540 } else { 541 unit = alloc_unr(drv->unrhdr); 542 } 543 544 snprintf(name, IFNAMSIZ, "%s%d", drv->cdevsw.d_name, unit); 545 546 /* find any existing device, or allocate new unit number */ 547 dev = NULL; 548 i = clone_create(&drv->clones, &drv->cdevsw, &unit, &dev, 0); 549 /* No preexisting struct cdev *, create one */ 550 if (i != 0) 551 i = tun_create_device(drv, unit, NULL, &dev, name); 552 if (i == 0) { 553 tuncreate(dev); 554 struct tuntap_softc *tp = dev->si_drv1; 555 *ifpp = tp->tun_ifp; 556 } 557 558 return (i); 559 } 560 561 static void 562 tunclone(void *arg, struct ucred *cred, char *name, int namelen, 563 struct cdev **dev) 564 { 565 char devname[SPECNAMELEN + 1]; 566 struct tuntap_driver *drv; 567 int append_unit, i, u, tunflags; 568 bool mayclone; 569 570 if (*dev != NULL) 571 return; 572 573 tunflags = 0; 574 CURVNET_SET(CRED_TO_VNET(cred)); 575 if (tuntap_name2info(name, &u, &tunflags) != 0) 576 goto out; /* Not recognized */ 577 578 if (u != -1 && u > IF_MAXUNIT) 579 goto out; /* Unit number too high */ 580 581 mayclone = priv_check_cred(cred, PRIV_NET_IFCREATE) == 0; 582 if ((tunflags & TUN_L2) != 0) { 583 /* tap/vmnet allow user open with a sysctl */ 584 mayclone = (mayclone || tap_allow_uopen) && tapdclone; 585 } else { 586 mayclone = mayclone && tundclone; 587 } 588 589 /* 590 * If tun cloning is enabled, only the superuser can create an 591 * interface. 592 */ 593 if (!mayclone) 594 goto out; 595 596 if (u == -1) 597 append_unit = 1; 598 else 599 append_unit = 0; 600 601 drv = tuntap_driver_from_flags(tunflags); 602 if (drv == NULL) 603 goto out; 604 605 /* find any existing device, or allocate new unit number */ 606 i = clone_create(&drv->clones, &drv->cdevsw, &u, dev, 0); 607 if (i) { 608 if (append_unit) { 609 namelen = snprintf(devname, sizeof(devname), "%s%d", 610 name, u); 611 name = devname; 612 } 613 614 i = tun_create_device(drv, u, cred, dev, name); 615 } 616 if (i == 0) 617 if_clone_create(name, namelen, NULL); 618 out: 619 CURVNET_RESTORE(); 620 } 621 622 static void 623 tun_destroy(struct tuntap_softc *tp) 624 { 625 626 TUN_LOCK(tp); 627 tp->tun_flags |= TUN_DYING; 628 if (tp->tun_busy != 0) 629 cv_wait_unlock(&tp->tun_cv, &tp->tun_mtx); 630 else 631 TUN_UNLOCK(tp); 632 633 CURVNET_SET(TUN2IFP(tp)->if_vnet); 634 635 /* destroy_dev will take care of any alias. */ 636 destroy_dev(tp->tun_dev); 637 seldrain(&tp->tun_rsel); 638 knlist_clear(&tp->tun_rsel.si_note, 0); 639 knlist_destroy(&tp->tun_rsel.si_note); 640 if ((tp->tun_flags & TUN_L2) != 0) { 641 ether_ifdetach(TUN2IFP(tp)); 642 } else { 643 bpfdetach(TUN2IFP(tp)); 644 if_detach(TUN2IFP(tp)); 645 } 646 sx_xlock(&tun_ioctl_sx); 647 TUN2IFP(tp)->if_softc = NULL; 648 sx_xunlock(&tun_ioctl_sx); 649 free_unr(tp->tun_drv->unrhdr, TUN2IFP(tp)->if_dunit); 650 if_free(TUN2IFP(tp)); 651 mtx_destroy(&tp->tun_mtx); 652 cv_destroy(&tp->tun_cv); 653 free(tp, M_TUN); 654 CURVNET_RESTORE(); 655 } 656 657 static int 658 tun_clone_destroy(struct if_clone *ifc __unused, struct ifnet *ifp, uint32_t flags) 659 { 660 struct tuntap_softc *tp = ifp->if_softc; 661 662 mtx_lock(&tunmtx); 663 TAILQ_REMOVE(&tunhead, tp, tun_list); 664 mtx_unlock(&tunmtx); 665 tun_destroy(tp); 666 667 return (0); 668 } 669 670 static void 671 vnet_tun_init(const void *unused __unused) 672 { 673 struct tuntap_driver *drv; 674 struct tuntap_driver_cloner *drvc; 675 int i; 676 677 for (i = 0; i < nitems(tuntap_drivers); ++i) { 678 drv = &tuntap_drivers[i]; 679 drvc = malloc(sizeof(*drvc), M_TUN, M_WAITOK | M_ZERO); 680 681 drvc->drv = drv; 682 struct if_clone_addreq req = { 683 .match_f = drv->clone_match_fn, 684 .create_f = drv->clone_create_fn, 685 .destroy_f = drv->clone_destroy_fn, 686 }; 687 drvc->cloner = ifc_attach_cloner(drv->cdevsw.d_name, &req); 688 SLIST_INSERT_HEAD(&V_tuntap_driver_cloners, drvc, link); 689 }; 690 } 691 VNET_SYSINIT(vnet_tun_init, SI_SUB_PROTO_IF, SI_ORDER_ANY, 692 vnet_tun_init, NULL); 693 694 static void 695 vnet_tun_uninit(const void *unused __unused) 696 { 697 struct tuntap_driver_cloner *drvc; 698 699 while (!SLIST_EMPTY(&V_tuntap_driver_cloners)) { 700 drvc = SLIST_FIRST(&V_tuntap_driver_cloners); 701 SLIST_REMOVE_HEAD(&V_tuntap_driver_cloners, link); 702 703 if_clone_detach(drvc->cloner); 704 free(drvc, M_TUN); 705 } 706 } 707 VNET_SYSUNINIT(vnet_tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY, 708 vnet_tun_uninit, NULL); 709 710 static void 711 tun_uninit(const void *unused __unused) 712 { 713 struct tuntap_driver *drv; 714 struct tuntap_softc *tp; 715 int i; 716 717 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, arrival_tag); 718 EVENTHANDLER_DEREGISTER(dev_clone, clone_tag); 719 720 mtx_lock(&tunmtx); 721 while ((tp = TAILQ_FIRST(&tunhead)) != NULL) { 722 TAILQ_REMOVE(&tunhead, tp, tun_list); 723 mtx_unlock(&tunmtx); 724 tun_destroy(tp); 725 mtx_lock(&tunmtx); 726 } 727 mtx_unlock(&tunmtx); 728 for (i = 0; i < nitems(tuntap_drivers); ++i) { 729 drv = &tuntap_drivers[i]; 730 delete_unrhdr(drv->unrhdr); 731 clone_cleanup(&drv->clones); 732 } 733 mtx_destroy(&tunmtx); 734 } 735 SYSUNINIT(tun_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY, tun_uninit, NULL); 736 737 static struct tuntap_driver * 738 tuntap_driver_from_ifnet(const struct ifnet *ifp) 739 { 740 struct tuntap_driver *drv; 741 int i; 742 743 if (ifp == NULL) 744 return (NULL); 745 746 for (i = 0; i < nitems(tuntap_drivers); ++i) { 747 drv = &tuntap_drivers[i]; 748 if (strcmp(ifp->if_dname, drv->cdevsw.d_name) == 0) 749 return (drv); 750 } 751 752 return (NULL); 753 } 754 755 static int 756 tuntapmodevent(module_t mod, int type, void *data) 757 { 758 struct tuntap_driver *drv; 759 int i; 760 761 switch (type) { 762 case MOD_LOAD: 763 mtx_init(&tunmtx, "tunmtx", NULL, MTX_DEF); 764 for (i = 0; i < nitems(tuntap_drivers); ++i) { 765 drv = &tuntap_drivers[i]; 766 clone_setup(&drv->clones); 767 drv->unrhdr = new_unrhdr(0, IF_MAXUNIT, &tunmtx); 768 } 769 arrival_tag = EVENTHANDLER_REGISTER(ifnet_arrival_event, 770 tunrename, 0, 1000); 771 if (arrival_tag == NULL) 772 return (ENOMEM); 773 clone_tag = EVENTHANDLER_REGISTER(dev_clone, tunclone, 0, 1000); 774 if (clone_tag == NULL) 775 return (ENOMEM); 776 break; 777 case MOD_UNLOAD: 778 /* See tun_uninit, so it's done after the vnet_sysuninit() */ 779 break; 780 default: 781 return EOPNOTSUPP; 782 } 783 return 0; 784 } 785 786 static moduledata_t tuntap_mod = { 787 "if_tuntap", 788 tuntapmodevent, 789 0 790 }; 791 792 /* We'll only ever have these two, so no need for a macro. */ 793 static moduledata_t tun_mod = { "if_tun", NULL, 0 }; 794 static moduledata_t tap_mod = { "if_tap", NULL, 0 }; 795 796 DECLARE_MODULE(if_tuntap, tuntap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 797 MODULE_VERSION(if_tuntap, 1); 798 DECLARE_MODULE(if_tun, tun_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 799 MODULE_VERSION(if_tun, 1); 800 DECLARE_MODULE(if_tap, tap_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 801 MODULE_VERSION(if_tap, 1); 802 803 static int 804 tun_create_device(struct tuntap_driver *drv, int unit, struct ucred *cr, 805 struct cdev **dev, const char *name) 806 { 807 struct make_dev_args args; 808 struct tuntap_softc *tp; 809 int error; 810 811 tp = malloc(sizeof(*tp), M_TUN, M_WAITOK | M_ZERO); 812 mtx_init(&tp->tun_mtx, "tun_mtx", NULL, MTX_DEF); 813 cv_init(&tp->tun_cv, "tun_condvar"); 814 tp->tun_flags = drv->ident_flags; 815 tp->tun_drv = drv; 816 817 make_dev_args_init(&args); 818 if (cr != NULL) 819 args.mda_flags = MAKEDEV_REF; 820 args.mda_devsw = &drv->cdevsw; 821 args.mda_cr = cr; 822 args.mda_uid = UID_UUCP; 823 args.mda_gid = GID_DIALER; 824 args.mda_mode = 0600; 825 args.mda_unit = unit; 826 args.mda_si_drv1 = tp; 827 error = make_dev_s(&args, dev, "%s", name); 828 if (error != 0) { 829 free(tp, M_TUN); 830 return (error); 831 } 832 833 KASSERT((*dev)->si_drv1 != NULL, 834 ("Failed to set si_drv1 at %s creation", name)); 835 tp->tun_dev = *dev; 836 knlist_init_mtx(&tp->tun_rsel.si_note, &tp->tun_mtx); 837 mtx_lock(&tunmtx); 838 TAILQ_INSERT_TAIL(&tunhead, tp, tun_list); 839 mtx_unlock(&tunmtx); 840 return (0); 841 } 842 843 static void 844 tunstart(struct ifnet *ifp) 845 { 846 struct tuntap_softc *tp = ifp->if_softc; 847 struct mbuf *m; 848 849 TUNDEBUG(ifp, "starting\n"); 850 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 851 IFQ_LOCK(&ifp->if_snd); 852 IFQ_POLL_NOLOCK(&ifp->if_snd, m); 853 if (m == NULL) { 854 IFQ_UNLOCK(&ifp->if_snd); 855 return; 856 } 857 IFQ_UNLOCK(&ifp->if_snd); 858 } 859 860 TUN_LOCK(tp); 861 if (tp->tun_flags & TUN_RWAIT) { 862 tp->tun_flags &= ~TUN_RWAIT; 863 wakeup(tp); 864 } 865 selwakeuppri(&tp->tun_rsel, PZERO + 1); 866 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 867 if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio) { 868 TUN_UNLOCK(tp); 869 pgsigio(&tp->tun_sigio, SIGIO, 0); 870 } else 871 TUN_UNLOCK(tp); 872 } 873 874 /* 875 * tunstart_l2 876 * 877 * queue packets from higher level ready to put out 878 */ 879 static void 880 tunstart_l2(struct ifnet *ifp) 881 { 882 struct tuntap_softc *tp = ifp->if_softc; 883 884 TUNDEBUG(ifp, "starting\n"); 885 886 /* 887 * do not junk pending output if we are in VMnet mode. 888 * XXX: can this do any harm because of queue overflow? 889 */ 890 891 TUN_LOCK(tp); 892 if (((tp->tun_flags & TUN_VMNET) == 0) && 893 ((tp->tun_flags & TUN_READY) != TUN_READY)) { 894 struct mbuf *m; 895 896 /* Unlocked read. */ 897 TUNDEBUG(ifp, "not ready, tun_flags = 0x%x\n", tp->tun_flags); 898 899 for (;;) { 900 IF_DEQUEUE(&ifp->if_snd, m); 901 if (m != NULL) { 902 m_freem(m); 903 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 904 } else 905 break; 906 } 907 TUN_UNLOCK(tp); 908 909 return; 910 } 911 912 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 913 914 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 915 if (tp->tun_flags & TUN_RWAIT) { 916 tp->tun_flags &= ~TUN_RWAIT; 917 wakeup(tp); 918 } 919 920 if ((tp->tun_flags & TUN_ASYNC) && (tp->tun_sigio != NULL)) { 921 TUN_UNLOCK(tp); 922 pgsigio(&tp->tun_sigio, SIGIO, 0); 923 TUN_LOCK(tp); 924 } 925 926 selwakeuppri(&tp->tun_rsel, PZERO+1); 927 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 928 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); /* obytes are counted in ether_output */ 929 } 930 931 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 932 TUN_UNLOCK(tp); 933 } /* tunstart_l2 */ 934 935 /* XXX: should return an error code so it can fail. */ 936 static void 937 tuncreate(struct cdev *dev) 938 { 939 struct tuntap_driver *drv; 940 struct tuntap_softc *tp; 941 struct ifnet *ifp; 942 struct ether_addr eaddr; 943 int iflags; 944 u_char type; 945 946 tp = dev->si_drv1; 947 KASSERT(tp != NULL, 948 ("si_drv1 should have been initialized at creation")); 949 950 drv = tp->tun_drv; 951 iflags = IFF_MULTICAST; 952 if ((tp->tun_flags & TUN_L2) != 0) { 953 type = IFT_ETHER; 954 iflags |= IFF_BROADCAST | IFF_SIMPLEX; 955 } else { 956 type = IFT_PPP; 957 iflags |= IFF_POINTOPOINT; 958 } 959 ifp = tp->tun_ifp = if_alloc(type); 960 if (ifp == NULL) 961 panic("%s%d: failed to if_alloc() interface.\n", 962 drv->cdevsw.d_name, dev2unit(dev)); 963 ifp->if_softc = tp; 964 if_initname(ifp, drv->cdevsw.d_name, dev2unit(dev)); 965 ifp->if_ioctl = tunifioctl; 966 ifp->if_flags = iflags; 967 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 968 ifp->if_capabilities |= IFCAP_LINKSTATE; 969 ifp->if_capenable |= IFCAP_LINKSTATE; 970 971 if ((tp->tun_flags & TUN_L2) != 0) { 972 ifp->if_init = tunifinit; 973 ifp->if_start = tunstart_l2; 974 975 ether_gen_addr(ifp, &eaddr); 976 ether_ifattach(ifp, eaddr.octet); 977 } else { 978 ifp->if_mtu = TUNMTU; 979 ifp->if_start = tunstart; 980 ifp->if_output = tunoutput; 981 982 ifp->if_snd.ifq_drv_maxlen = 0; 983 IFQ_SET_READY(&ifp->if_snd); 984 985 if_attach(ifp); 986 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 987 } 988 989 TUN_LOCK(tp); 990 tp->tun_flags |= TUN_INITED; 991 TUN_UNLOCK(tp); 992 993 TUNDEBUG(ifp, "interface %s is created, minor = %#x\n", 994 ifp->if_xname, dev2unit(dev)); 995 } 996 997 static void 998 tunrename(void *arg __unused, struct ifnet *ifp) 999 { 1000 struct tuntap_softc *tp; 1001 int error; 1002 1003 if ((ifp->if_flags & IFF_RENAMING) == 0) 1004 return; 1005 1006 if (tuntap_driver_from_ifnet(ifp) == NULL) 1007 return; 1008 1009 /* 1010 * We need to grab the ioctl sx long enough to make sure the softc is 1011 * still there. If it is, we can safely try to busy the tun device. 1012 * The busy may fail if the device is currently dying, in which case 1013 * we do nothing. If it doesn't fail, the busy count stops the device 1014 * from dying until we've created the alias (that will then be 1015 * subsequently destroyed). 1016 */ 1017 sx_xlock(&tun_ioctl_sx); 1018 tp = ifp->if_softc; 1019 if (tp == NULL) { 1020 sx_xunlock(&tun_ioctl_sx); 1021 return; 1022 } 1023 error = tun_busy(tp); 1024 sx_xunlock(&tun_ioctl_sx); 1025 if (error != 0) 1026 return; 1027 if (tp->tun_alias != NULL) { 1028 destroy_dev(tp->tun_alias); 1029 tp->tun_alias = NULL; 1030 } 1031 1032 if (strcmp(ifp->if_xname, tp->tun_dev->si_name) == 0) 1033 goto out; 1034 1035 /* 1036 * Failure's ok, aliases are created on a best effort basis. If a 1037 * tun user/consumer decides to rename the interface to conflict with 1038 * another device (non-ifnet) on the system, we will assume they know 1039 * what they are doing. make_dev_alias_p won't touch tun_alias on 1040 * failure, so we use it but ignore the return value. 1041 */ 1042 make_dev_alias_p(MAKEDEV_CHECKNAME, &tp->tun_alias, tp->tun_dev, "%s", 1043 ifp->if_xname); 1044 out: 1045 tun_unbusy(tp); 1046 } 1047 1048 static int 1049 tunopen(struct cdev *dev, int flag, int mode, struct thread *td) 1050 { 1051 struct ifnet *ifp; 1052 struct tuntap_softc *tp; 1053 int error __diagused, tunflags; 1054 1055 tunflags = 0; 1056 CURVNET_SET(TD_TO_VNET(td)); 1057 error = tuntap_name2info(dev->si_name, NULL, &tunflags); 1058 if (error != 0) { 1059 CURVNET_RESTORE(); 1060 return (error); /* Shouldn't happen */ 1061 } 1062 1063 tp = dev->si_drv1; 1064 KASSERT(tp != NULL, 1065 ("si_drv1 should have been initialized at creation")); 1066 1067 TUN_LOCK(tp); 1068 if ((tp->tun_flags & TUN_INITED) == 0) { 1069 TUN_UNLOCK(tp); 1070 CURVNET_RESTORE(); 1071 return (ENXIO); 1072 } 1073 if ((tp->tun_flags & (TUN_OPEN | TUN_DYING)) != 0) { 1074 TUN_UNLOCK(tp); 1075 CURVNET_RESTORE(); 1076 return (EBUSY); 1077 } 1078 1079 error = tun_busy_locked(tp); 1080 KASSERT(error == 0, ("Must be able to busy an unopen tunnel")); 1081 ifp = TUN2IFP(tp); 1082 1083 if ((tp->tun_flags & TUN_L2) != 0) { 1084 bcopy(IF_LLADDR(ifp), tp->tun_ether.octet, 1085 sizeof(tp->tun_ether.octet)); 1086 1087 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1088 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1089 1090 if (tapuponopen) 1091 ifp->if_flags |= IFF_UP; 1092 } 1093 1094 tp->tun_pid = td->td_proc->p_pid; 1095 tp->tun_flags |= TUN_OPEN; 1096 1097 if_link_state_change(ifp, LINK_STATE_UP); 1098 TUNDEBUG(ifp, "open\n"); 1099 TUN_UNLOCK(tp); 1100 1101 /* 1102 * This can fail with either ENOENT or EBUSY. This is in the middle of 1103 * d_open, so ENOENT should not be possible. EBUSY is possible, but 1104 * the only cdevpriv dtor being set will be tundtor and the softc being 1105 * passed is constant for a given cdev. We ignore the possible error 1106 * because of this as either "unlikely" or "not actually a problem." 1107 */ 1108 (void)devfs_set_cdevpriv(tp, tundtor); 1109 CURVNET_RESTORE(); 1110 return (0); 1111 } 1112 1113 /* 1114 * tundtor - tear down the device - mark i/f down & delete 1115 * routing info 1116 */ 1117 static void 1118 tundtor(void *data) 1119 { 1120 struct proc *p; 1121 struct tuntap_softc *tp; 1122 struct ifnet *ifp; 1123 bool l2tun; 1124 1125 tp = data; 1126 p = curproc; 1127 ifp = TUN2IFP(tp); 1128 1129 TUN_LOCK(tp); 1130 1131 /* 1132 * Realistically, we can't be obstinate here. This only means that the 1133 * tuntap device was closed out of order, and the last closer wasn't the 1134 * controller. These are still good to know about, though, as software 1135 * should avoid multiple processes with a tuntap device open and 1136 * ill-defined transfer of control (e.g., handoff, TUNSIFPID, close in 1137 * parent). 1138 */ 1139 if (p->p_pid != tp->tun_pid) { 1140 log(LOG_INFO, 1141 "pid %d (%s), %s: tun/tap protocol violation, non-controlling process closed last.\n", 1142 p->p_pid, p->p_comm, tp->tun_dev->si_name); 1143 } 1144 1145 /* 1146 * junk all pending output 1147 */ 1148 CURVNET_SET(ifp->if_vnet); 1149 1150 l2tun = false; 1151 if ((tp->tun_flags & TUN_L2) != 0) { 1152 l2tun = true; 1153 IF_DRAIN(&ifp->if_snd); 1154 } else { 1155 IFQ_PURGE(&ifp->if_snd); 1156 } 1157 1158 /* For vmnet, we won't do most of the address/route bits */ 1159 if ((tp->tun_flags & TUN_VMNET) != 0 || 1160 (l2tun && (ifp->if_flags & IFF_LINK0) != 0)) 1161 goto out; 1162 1163 if (ifp->if_flags & IFF_UP) { 1164 TUN_UNLOCK(tp); 1165 if_down(ifp); 1166 TUN_LOCK(tp); 1167 } 1168 1169 /* Delete all addresses and routes which reference this interface. */ 1170 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1171 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1172 TUN_UNLOCK(tp); 1173 if_purgeaddrs(ifp); 1174 TUN_LOCK(tp); 1175 } 1176 1177 out: 1178 if_link_state_change(ifp, LINK_STATE_DOWN); 1179 CURVNET_RESTORE(); 1180 1181 funsetown(&tp->tun_sigio); 1182 selwakeuppri(&tp->tun_rsel, PZERO + 1); 1183 KNOTE_LOCKED(&tp->tun_rsel.si_note, 0); 1184 TUNDEBUG (ifp, "closed\n"); 1185 tp->tun_flags &= ~TUN_OPEN; 1186 tp->tun_pid = 0; 1187 tun_vnethdr_set(ifp, 0); 1188 1189 tun_unbusy_locked(tp); 1190 TUN_UNLOCK(tp); 1191 } 1192 1193 static void 1194 tuninit(struct ifnet *ifp) 1195 { 1196 struct tuntap_softc *tp = ifp->if_softc; 1197 1198 TUNDEBUG(ifp, "tuninit\n"); 1199 1200 TUN_LOCK(tp); 1201 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1202 if ((tp->tun_flags & TUN_L2) == 0) { 1203 ifp->if_flags |= IFF_UP; 1204 getmicrotime(&ifp->if_lastchange); 1205 TUN_UNLOCK(tp); 1206 } else { 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; 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) 1411 bcopy(dst->sa_data, &af, sizeof(af)); 1412 else 1413 af = RO_GET_FAMILY(ro, dst); 1414 1415 if (bpf_peers_present(ifp->if_bpf)) 1416 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m0); 1417 1418 /* prepend sockaddr? this may abort if the mbuf allocation fails */ 1419 if (cached_tun_flags & TUN_LMODE) { 1420 /* allocate space for sockaddr */ 1421 M_PREPEND(m0, dst->sa_len, M_NOWAIT); 1422 1423 /* if allocation failed drop packet */ 1424 if (m0 == NULL) { 1425 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1); 1426 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 1427 return (ENOBUFS); 1428 } else { 1429 bcopy(dst, m0->m_data, dst->sa_len); 1430 } 1431 } 1432 1433 if (cached_tun_flags & TUN_IFHEAD) { 1434 /* Prepend the address family */ 1435 M_PREPEND(m0, 4, M_NOWAIT); 1436 1437 /* if allocation failed drop packet */ 1438 if (m0 == NULL) { 1439 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1); 1440 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 1441 return (ENOBUFS); 1442 } else 1443 *(u_int32_t *)m0->m_data = htonl(af); 1444 } else { 1445 #ifdef INET 1446 if (af != AF_INET) 1447 #endif 1448 { 1449 m_freem(m0); 1450 return (EAFNOSUPPORT); 1451 } 1452 } 1453 1454 error = (ifp->if_transmit)(ifp, m0); 1455 if (error) 1456 return (ENOBUFS); 1457 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 1458 return (0); 1459 } 1460 1461 /* 1462 * the cdevsw interface is now pretty minimal. 1463 */ 1464 static int 1465 tunioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, 1466 struct thread *td) 1467 { 1468 struct ifreq ifr, *ifrp; 1469 struct tuntap_softc *tp = dev->si_drv1; 1470 struct ifnet *ifp = TUN2IFP(tp); 1471 struct tuninfo *tunp; 1472 int error, iflags, ival; 1473 bool l2tun; 1474 1475 l2tun = (tp->tun_flags & TUN_L2) != 0; 1476 if (l2tun) { 1477 /* tap specific ioctls */ 1478 switch(cmd) { 1479 /* VMware/VMnet port ioctl's */ 1480 #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 1481 defined(COMPAT_FREEBSD4) 1482 case _IO('V', 0): 1483 ival = IOCPARM_IVAL(data); 1484 data = (caddr_t)&ival; 1485 /* FALLTHROUGH */ 1486 #endif 1487 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 1488 iflags = *(int *)data; 1489 iflags &= TUN_VMIO_FLAG_MASK; 1490 iflags &= ~IFF_CANTCHANGE; 1491 iflags |= IFF_UP; 1492 1493 TUN_LOCK(tp); 1494 ifp->if_flags = iflags | 1495 (ifp->if_flags & IFF_CANTCHANGE); 1496 TUN_UNLOCK(tp); 1497 1498 return (0); 1499 case SIOCGIFADDR: /* get MAC address of the remote side */ 1500 TUN_LOCK(tp); 1501 bcopy(&tp->tun_ether.octet, data, 1502 sizeof(tp->tun_ether.octet)); 1503 TUN_UNLOCK(tp); 1504 1505 return (0); 1506 case SIOCSIFADDR: /* set MAC address of the remote side */ 1507 TUN_LOCK(tp); 1508 bcopy(data, &tp->tun_ether.octet, 1509 sizeof(tp->tun_ether.octet)); 1510 TUN_UNLOCK(tp); 1511 1512 return (0); 1513 case TAPSVNETHDR: 1514 ival = *(int *)data; 1515 if (ival != 0 && 1516 ival != sizeof(struct virtio_net_hdr) && 1517 ival != sizeof(struct virtio_net_hdr_mrg_rxbuf)) { 1518 return (EINVAL); 1519 } 1520 TUN_LOCK(tp); 1521 tun_vnethdr_set(ifp, ival); 1522 TUN_UNLOCK(tp); 1523 1524 return (0); 1525 case TAPGVNETHDR: 1526 TUN_LOCK(tp); 1527 *(int *)data = tp->tun_vhdrlen; 1528 TUN_UNLOCK(tp); 1529 1530 return (0); 1531 } 1532 1533 /* Fall through to the common ioctls if unhandled */ 1534 } else { 1535 switch (cmd) { 1536 case TUNSLMODE: 1537 TUN_LOCK(tp); 1538 if (*(int *)data) { 1539 tp->tun_flags |= TUN_LMODE; 1540 tp->tun_flags &= ~TUN_IFHEAD; 1541 } else 1542 tp->tun_flags &= ~TUN_LMODE; 1543 TUN_UNLOCK(tp); 1544 1545 return (0); 1546 case TUNSIFHEAD: 1547 TUN_LOCK(tp); 1548 if (*(int *)data) { 1549 tp->tun_flags |= TUN_IFHEAD; 1550 tp->tun_flags &= ~TUN_LMODE; 1551 } else 1552 tp->tun_flags &= ~TUN_IFHEAD; 1553 TUN_UNLOCK(tp); 1554 1555 return (0); 1556 case TUNGIFHEAD: 1557 TUN_LOCK(tp); 1558 *(int *)data = (tp->tun_flags & TUN_IFHEAD) ? 1 : 0; 1559 TUN_UNLOCK(tp); 1560 1561 return (0); 1562 case TUNSIFMODE: 1563 /* deny this if UP */ 1564 if (TUN2IFP(tp)->if_flags & IFF_UP) 1565 return (EBUSY); 1566 1567 switch (*(int *)data & ~IFF_MULTICAST) { 1568 case IFF_POINTOPOINT: 1569 case IFF_BROADCAST: 1570 TUN_LOCK(tp); 1571 TUN2IFP(tp)->if_flags &= 1572 ~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST); 1573 TUN2IFP(tp)->if_flags |= *(int *)data; 1574 TUN_UNLOCK(tp); 1575 1576 break; 1577 default: 1578 return (EINVAL); 1579 } 1580 1581 return (0); 1582 case TUNSIFPID: 1583 TUN_LOCK(tp); 1584 tp->tun_pid = curthread->td_proc->p_pid; 1585 TUN_UNLOCK(tp); 1586 1587 return (0); 1588 } 1589 /* Fall through to the common ioctls if unhandled */ 1590 } 1591 1592 switch (cmd) { 1593 case TUNGIFNAME: 1594 ifrp = (struct ifreq *)data; 1595 strlcpy(ifrp->ifr_name, TUN2IFP(tp)->if_xname, IFNAMSIZ); 1596 1597 return (0); 1598 case TUNSIFINFO: 1599 tunp = (struct tuninfo *)data; 1600 if (TUN2IFP(tp)->if_type != tunp->type) 1601 return (EPROTOTYPE); 1602 TUN_LOCK(tp); 1603 if (TUN2IFP(tp)->if_mtu != tunp->mtu) { 1604 strlcpy(ifr.ifr_name, if_name(TUN2IFP(tp)), IFNAMSIZ); 1605 ifr.ifr_mtu = tunp->mtu; 1606 CURVNET_SET(TUN2IFP(tp)->if_vnet); 1607 error = ifhwioctl(SIOCSIFMTU, TUN2IFP(tp), 1608 (caddr_t)&ifr, td); 1609 CURVNET_RESTORE(); 1610 if (error) { 1611 TUN_UNLOCK(tp); 1612 return (error); 1613 } 1614 } 1615 TUN2IFP(tp)->if_baudrate = tunp->baudrate; 1616 TUN_UNLOCK(tp); 1617 break; 1618 case TUNGIFINFO: 1619 tunp = (struct tuninfo *)data; 1620 TUN_LOCK(tp); 1621 tunp->mtu = TUN2IFP(tp)->if_mtu; 1622 tunp->type = TUN2IFP(tp)->if_type; 1623 tunp->baudrate = TUN2IFP(tp)->if_baudrate; 1624 TUN_UNLOCK(tp); 1625 break; 1626 case TUNSDEBUG: 1627 tundebug = *(int *)data; 1628 break; 1629 case TUNGDEBUG: 1630 *(int *)data = tundebug; 1631 break; 1632 case FIONBIO: 1633 break; 1634 case FIOASYNC: 1635 TUN_LOCK(tp); 1636 if (*(int *)data) 1637 tp->tun_flags |= TUN_ASYNC; 1638 else 1639 tp->tun_flags &= ~TUN_ASYNC; 1640 TUN_UNLOCK(tp); 1641 break; 1642 case FIONREAD: 1643 if (!IFQ_IS_EMPTY(&TUN2IFP(tp)->if_snd)) { 1644 struct mbuf *mb; 1645 IFQ_LOCK(&TUN2IFP(tp)->if_snd); 1646 IFQ_POLL_NOLOCK(&TUN2IFP(tp)->if_snd, mb); 1647 for (*(int *)data = 0; mb != NULL; mb = mb->m_next) 1648 *(int *)data += mb->m_len; 1649 IFQ_UNLOCK(&TUN2IFP(tp)->if_snd); 1650 } else 1651 *(int *)data = 0; 1652 break; 1653 case FIOSETOWN: 1654 return (fsetown(*(int *)data, &tp->tun_sigio)); 1655 1656 case FIOGETOWN: 1657 *(int *)data = fgetown(&tp->tun_sigio); 1658 return (0); 1659 1660 /* This is deprecated, FIOSETOWN should be used instead. */ 1661 case TIOCSPGRP: 1662 return (fsetown(-(*(int *)data), &tp->tun_sigio)); 1663 1664 /* This is deprecated, FIOGETOWN should be used instead. */ 1665 case TIOCGPGRP: 1666 *(int *)data = -fgetown(&tp->tun_sigio); 1667 return (0); 1668 1669 default: 1670 return (ENOTTY); 1671 } 1672 return (0); 1673 } 1674 1675 /* 1676 * The cdevsw read interface - reads a packet at a time, or at 1677 * least as much of a packet as can be read. 1678 */ 1679 static int 1680 tunread(struct cdev *dev, struct uio *uio, int flag) 1681 { 1682 struct tuntap_softc *tp = dev->si_drv1; 1683 struct ifnet *ifp = TUN2IFP(tp); 1684 struct mbuf *m; 1685 size_t len; 1686 int error = 0; 1687 1688 TUNDEBUG (ifp, "read\n"); 1689 TUN_LOCK(tp); 1690 if ((tp->tun_flags & TUN_READY) != TUN_READY) { 1691 TUN_UNLOCK(tp); 1692 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 1693 return (EHOSTDOWN); 1694 } 1695 1696 tp->tun_flags &= ~TUN_RWAIT; 1697 1698 for (;;) { 1699 IFQ_DEQUEUE(&ifp->if_snd, m); 1700 if (m != NULL) 1701 break; 1702 if (flag & O_NONBLOCK) { 1703 TUN_UNLOCK(tp); 1704 return (EWOULDBLOCK); 1705 } 1706 tp->tun_flags |= TUN_RWAIT; 1707 error = mtx_sleep(tp, &tp->tun_mtx, PCATCH | (PZERO + 1), 1708 "tunread", 0); 1709 if (error != 0) { 1710 TUN_UNLOCK(tp); 1711 return (error); 1712 } 1713 } 1714 TUN_UNLOCK(tp); 1715 1716 if ((tp->tun_flags & TUN_L2) != 0) 1717 BPF_MTAP(ifp, m); 1718 1719 len = min(tp->tun_vhdrlen, uio->uio_resid); 1720 if (len > 0) { 1721 struct virtio_net_hdr_mrg_rxbuf vhdr; 1722 1723 bzero(&vhdr, sizeof(vhdr)); 1724 if (m->m_pkthdr.csum_flags & TAP_ALL_OFFLOAD) { 1725 m = virtio_net_tx_offload(ifp, m, false, &vhdr.hdr); 1726 } 1727 1728 TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, " 1729 "gs %u, cs %u, co %u\n", vhdr.hdr.flags, 1730 vhdr.hdr.gso_type, vhdr.hdr.hdr_len, 1731 vhdr.hdr.gso_size, vhdr.hdr.csum_start, 1732 vhdr.hdr.csum_offset); 1733 error = uiomove(&vhdr, len, uio); 1734 } 1735 1736 while (m && uio->uio_resid > 0 && error == 0) { 1737 len = min(uio->uio_resid, m->m_len); 1738 if (len != 0) 1739 error = uiomove(mtod(m, void *), len, uio); 1740 m = m_free(m); 1741 } 1742 1743 if (m) { 1744 TUNDEBUG(ifp, "Dropping mbuf\n"); 1745 m_freem(m); 1746 } 1747 return (error); 1748 } 1749 1750 static int 1751 tunwrite_l2(struct tuntap_softc *tp, struct mbuf *m, 1752 struct virtio_net_hdr_mrg_rxbuf *vhdr) 1753 { 1754 struct epoch_tracker et; 1755 struct ether_header *eh; 1756 struct ifnet *ifp; 1757 1758 ifp = TUN2IFP(tp); 1759 1760 /* 1761 * Only pass a unicast frame to ether_input(), if it would 1762 * actually have been received by non-virtual hardware. 1763 */ 1764 if (m->m_len < sizeof(struct ether_header)) { 1765 m_freem(m); 1766 return (0); 1767 } 1768 1769 eh = mtod(m, struct ether_header *); 1770 1771 if (eh && (ifp->if_flags & IFF_PROMISC) == 0 && 1772 !ETHER_IS_MULTICAST(eh->ether_dhost) && 1773 bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) { 1774 m_freem(m); 1775 return (0); 1776 } 1777 1778 if (vhdr != NULL && virtio_net_rx_csum(m, &vhdr->hdr)) { 1779 m_freem(m); 1780 return (0); 1781 } 1782 1783 /* Pass packet up to parent. */ 1784 CURVNET_SET(ifp->if_vnet); 1785 NET_EPOCH_ENTER(et); 1786 (*ifp->if_input)(ifp, m); 1787 NET_EPOCH_EXIT(et); 1788 CURVNET_RESTORE(); 1789 /* ibytes are counted in parent */ 1790 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 1791 return (0); 1792 } 1793 1794 static int 1795 tunwrite_l3(struct tuntap_softc *tp, struct mbuf *m) 1796 { 1797 struct epoch_tracker et; 1798 struct ifnet *ifp; 1799 int family, isr; 1800 1801 ifp = TUN2IFP(tp); 1802 /* Could be unlocked read? */ 1803 TUN_LOCK(tp); 1804 if (tp->tun_flags & TUN_IFHEAD) { 1805 TUN_UNLOCK(tp); 1806 if (m->m_len < sizeof(family) && 1807 (m = m_pullup(m, sizeof(family))) == NULL) 1808 return (ENOBUFS); 1809 family = ntohl(*mtod(m, u_int32_t *)); 1810 m_adj(m, sizeof(family)); 1811 } else { 1812 TUN_UNLOCK(tp); 1813 family = AF_INET; 1814 } 1815 1816 BPF_MTAP2(ifp, &family, sizeof(family), m); 1817 1818 switch (family) { 1819 #ifdef INET 1820 case AF_INET: 1821 isr = NETISR_IP; 1822 break; 1823 #endif 1824 #ifdef INET6 1825 case AF_INET6: 1826 isr = NETISR_IPV6; 1827 break; 1828 #endif 1829 default: 1830 m_freem(m); 1831 return (EAFNOSUPPORT); 1832 } 1833 random_harvest_queue(m, sizeof(*m), RANDOM_NET_TUN); 1834 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 1835 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 1836 CURVNET_SET(ifp->if_vnet); 1837 M_SETFIB(m, ifp->if_fib); 1838 NET_EPOCH_ENTER(et); 1839 netisr_dispatch(isr, m); 1840 NET_EPOCH_EXIT(et); 1841 CURVNET_RESTORE(); 1842 return (0); 1843 } 1844 1845 /* 1846 * the cdevsw write interface - an atomic write is a packet - or else! 1847 */ 1848 static int 1849 tunwrite(struct cdev *dev, struct uio *uio, int flag) 1850 { 1851 struct virtio_net_hdr_mrg_rxbuf vhdr; 1852 struct tuntap_softc *tp; 1853 struct ifnet *ifp; 1854 struct mbuf *m; 1855 uint32_t mru; 1856 int align, vhdrlen, error; 1857 bool l2tun; 1858 1859 tp = dev->si_drv1; 1860 ifp = TUN2IFP(tp); 1861 TUNDEBUG(ifp, "tunwrite\n"); 1862 if ((ifp->if_flags & IFF_UP) != IFF_UP) 1863 /* ignore silently */ 1864 return (0); 1865 1866 if (uio->uio_resid == 0) 1867 return (0); 1868 1869 l2tun = (tp->tun_flags & TUN_L2) != 0; 1870 mru = l2tun ? TAPMRU : TUNMRU; 1871 vhdrlen = tp->tun_vhdrlen; 1872 align = 0; 1873 if (l2tun) { 1874 align = ETHER_ALIGN; 1875 mru += vhdrlen; 1876 } else if ((tp->tun_flags & TUN_IFHEAD) != 0) 1877 mru += sizeof(uint32_t); /* family */ 1878 if (uio->uio_resid < 0 || uio->uio_resid > mru) { 1879 TUNDEBUG(ifp, "len=%zd!\n", uio->uio_resid); 1880 return (EIO); 1881 } 1882 1883 if (vhdrlen > 0) { 1884 error = uiomove(&vhdr, vhdrlen, uio); 1885 if (error != 0) 1886 return (error); 1887 TUNDEBUG(ifp, "txvhdr: f %u, gt %u, hl %u, " 1888 "gs %u, cs %u, co %u\n", vhdr.hdr.flags, 1889 vhdr.hdr.gso_type, vhdr.hdr.hdr_len, 1890 vhdr.hdr.gso_size, vhdr.hdr.csum_start, 1891 vhdr.hdr.csum_offset); 1892 } 1893 1894 if ((m = m_uiotombuf(uio, M_NOWAIT, 0, align, M_PKTHDR)) == NULL) { 1895 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 1896 return (ENOBUFS); 1897 } 1898 1899 m->m_pkthdr.rcvif = ifp; 1900 #ifdef MAC 1901 mac_ifnet_create_mbuf(ifp, m); 1902 #endif 1903 1904 if (l2tun) 1905 return (tunwrite_l2(tp, m, vhdrlen > 0 ? &vhdr : NULL)); 1906 1907 return (tunwrite_l3(tp, m)); 1908 } 1909 1910 /* 1911 * tunpoll - the poll interface, this is only useful on reads 1912 * really. The write detect always returns true, write never blocks 1913 * anyway, it either accepts the packet or drops it. 1914 */ 1915 static int 1916 tunpoll(struct cdev *dev, int events, struct thread *td) 1917 { 1918 struct tuntap_softc *tp = dev->si_drv1; 1919 struct ifnet *ifp = TUN2IFP(tp); 1920 int revents = 0; 1921 1922 TUNDEBUG(ifp, "tunpoll\n"); 1923 1924 if (events & (POLLIN | POLLRDNORM)) { 1925 IFQ_LOCK(&ifp->if_snd); 1926 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 1927 TUNDEBUG(ifp, "tunpoll q=%d\n", ifp->if_snd.ifq_len); 1928 revents |= events & (POLLIN | POLLRDNORM); 1929 } else { 1930 TUNDEBUG(ifp, "tunpoll waiting\n"); 1931 selrecord(td, &tp->tun_rsel); 1932 } 1933 IFQ_UNLOCK(&ifp->if_snd); 1934 } 1935 revents |= events & (POLLOUT | POLLWRNORM); 1936 1937 return (revents); 1938 } 1939 1940 /* 1941 * tunkqfilter - support for the kevent() system call. 1942 */ 1943 static int 1944 tunkqfilter(struct cdev *dev, struct knote *kn) 1945 { 1946 struct tuntap_softc *tp = dev->si_drv1; 1947 struct ifnet *ifp = TUN2IFP(tp); 1948 1949 switch(kn->kn_filter) { 1950 case EVFILT_READ: 1951 TUNDEBUG(ifp, "%s kqfilter: EVFILT_READ, minor = %#x\n", 1952 ifp->if_xname, dev2unit(dev)); 1953 kn->kn_fop = &tun_read_filterops; 1954 break; 1955 1956 case EVFILT_WRITE: 1957 TUNDEBUG(ifp, "%s kqfilter: EVFILT_WRITE, minor = %#x\n", 1958 ifp->if_xname, dev2unit(dev)); 1959 kn->kn_fop = &tun_write_filterops; 1960 break; 1961 1962 default: 1963 TUNDEBUG(ifp, "%s kqfilter: invalid filter, minor = %#x\n", 1964 ifp->if_xname, dev2unit(dev)); 1965 return(EINVAL); 1966 } 1967 1968 kn->kn_hook = tp; 1969 knlist_add(&tp->tun_rsel.si_note, kn, 0); 1970 1971 return (0); 1972 } 1973 1974 /* 1975 * Return true of there is data in the interface queue. 1976 */ 1977 static int 1978 tunkqread(struct knote *kn, long hint) 1979 { 1980 int ret; 1981 struct tuntap_softc *tp = kn->kn_hook; 1982 struct cdev *dev = tp->tun_dev; 1983 struct ifnet *ifp = TUN2IFP(tp); 1984 1985 if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) { 1986 TUNDEBUG(ifp, 1987 "%s have data in the queue. Len = %d, minor = %#x\n", 1988 ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev)); 1989 ret = 1; 1990 } else { 1991 TUNDEBUG(ifp, 1992 "%s waiting for data, minor = %#x\n", ifp->if_xname, 1993 dev2unit(dev)); 1994 ret = 0; 1995 } 1996 1997 return (ret); 1998 } 1999 2000 /* 2001 * Always can write, always return MTU in kn->data. 2002 */ 2003 static int 2004 tunkqwrite(struct knote *kn, long hint) 2005 { 2006 struct tuntap_softc *tp = kn->kn_hook; 2007 struct ifnet *ifp = TUN2IFP(tp); 2008 2009 kn->kn_data = ifp->if_mtu; 2010 2011 return (1); 2012 } 2013 2014 static void 2015 tunkqdetach(struct knote *kn) 2016 { 2017 struct tuntap_softc *tp = kn->kn_hook; 2018 2019 knlist_remove(&tp->tun_rsel.si_note, kn, 0); 2020 }
Cache object: e9dbd4f1bcbdef09f43daa6cc4bde45f
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