1 /* 2 * Copyright (C) 1999-2000 by Maksim Yevmenkin <m_evmenkin@yahoo.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * BASED ON: 27 * ------------------------------------------------------------------------- 28 * 29 * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk> 30 * Nottingham University 1987. 31 */ 32 33 /* 34 * $FreeBSD: src/sys/net/if_tap.c,v 1.3.2.3 2002/04/14 21:41:48 luigi Exp $ 35 * $Id: if_tap.c,v 0.21 2000/07/23 21:46:02 max Exp $ 36 */ 37 38 #include "opt_inet.h" 39 40 #include <sys/param.h> 41 #include <sys/conf.h> 42 #include <sys/device.h> 43 #include <sys/filedesc.h> 44 #include <sys/filio.h> 45 #include <sys/kernel.h> 46 #include <sys/malloc.h> 47 #include <sys/mbuf.h> 48 #include <sys/proc.h> 49 #include <sys/priv.h> 50 #include <sys/signalvar.h> 51 #include <sys/socket.h> 52 #include <sys/sockio.h> 53 #include <sys/sysctl.h> 54 #include <sys/systm.h> 55 #include <sys/ttycom.h> 56 #include <sys/uio.h> 57 #include <sys/vnode.h> 58 #include <sys/serialize.h> 59 #include <sys/thread2.h> 60 #include <sys/mplock2.h> 61 #include <sys/devfs.h> 62 #include <sys/queue.h> 63 64 #include <net/bpf.h> 65 #include <net/ethernet.h> 66 #include <net/if.h> 67 #include <net/if_types.h> 68 #include <net/if_arp.h> 69 #include <net/if_clone.h> 70 #include <net/if_media.h> 71 #include <net/ifq_var.h> 72 #include <net/route.h> 73 74 #include <netinet/in.h> 75 76 #include "if_tapvar.h" 77 #include "if_tap.h" 78 79 #define TAP_IFFLAGS (IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST) 80 81 #define TAP "tap" 82 #define TAPDEBUG if (tapdebug) if_printf 83 84 /* module */ 85 static int tapmodevent(module_t, int, void *); 86 87 /* device */ 88 static struct tap_softc *tapcreate(cdev_t, int); 89 static void tapdestroy(struct tap_softc *); 90 91 /* clone */ 92 static int tap_clone_create(struct if_clone *, int, caddr_t); 93 static int tap_clone_destroy(struct ifnet *); 94 95 /* network interface */ 96 static void tapifinit(void *); 97 static void tapifstart(struct ifnet *, struct ifaltq_subque *); 98 static int tapifioctl(struct ifnet *, u_long, caddr_t, 99 struct ucred *); 100 static void tapifstop(struct tap_softc *, int); 101 static void tapifflags(struct tap_softc *); 102 103 /* character device */ 104 static d_open_t tapopen; 105 static d_clone_t tapclone; 106 static d_close_t tapclose; 107 static d_read_t tapread; 108 static d_write_t tapwrite; 109 static d_ioctl_t tapioctl; 110 static d_kqfilter_t tapkqfilter; 111 112 static struct dev_ops tap_ops = { 113 { TAP, 0, 0 }, 114 .d_open = tapopen, 115 .d_close = tapclose, 116 .d_read = tapread, 117 .d_write = tapwrite, 118 .d_ioctl = tapioctl, 119 .d_kqfilter = tapkqfilter 120 }; 121 122 /* kqueue support */ 123 static void tap_filter_detach(struct knote *); 124 static int tap_filter_read(struct knote *, long); 125 static int tap_filter_write(struct knote *, long); 126 127 static struct filterops tapread_filtops = { 128 FILTEROP_ISFD, 129 NULL, 130 tap_filter_detach, 131 tap_filter_read 132 }; 133 static struct filterops tapwrite_filtops = { 134 FILTEROP_ISFD, 135 NULL, 136 tap_filter_detach, 137 tap_filter_write 138 }; 139 140 static int tapdebug = 0; /* debug flag */ 141 static int taprefcnt = 0; /* module ref. counter */ 142 static int tapuopen = 0; /* allow user open() */ 143 static int tapuponopen = 0; /* IFF_UP when opened */ 144 145 static MALLOC_DEFINE(M_TAP, TAP, "Ethernet tunnel interface"); 146 147 static DEVFS_DEFINE_CLONE_BITMAP(tap); 148 149 struct if_clone tap_cloner = IF_CLONE_INITIALIZER( 150 TAP, tap_clone_create, tap_clone_destroy, 0, IF_MAXUNIT); 151 152 static SLIST_HEAD(,tap_softc) tap_listhead = 153 SLIST_HEAD_INITIALIZER(&tap_listhead); 154 155 SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, ""); 156 SYSCTL_DECL(_net_link); 157 SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0, 158 "Ethernet tunnel software network interface"); 159 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0, 160 "Allow user to open /dev/tap (based on node permissions)"); 161 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0, 162 "Bring interface up when /dev/tap is opened"); 163 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, ""); 164 SYSCTL_INT(_net_link_tap, OID_AUTO, refcnt, CTLFLAG_RD, &taprefcnt, 0, 165 "Number of opened devices"); 166 167 DEV_MODULE(if_tap, tapmodevent, NULL); 168 169 /* 170 * tapmodevent 171 * 172 * module event handler 173 */ 174 static int 175 tapmodevent(module_t mod, int type, void *data) 176 { 177 static cdev_t dev = NULL; 178 struct tap_softc *sc, *sc_tmp; 179 180 switch (type) { 181 case MOD_LOAD: 182 dev = make_autoclone_dev(&tap_ops, &DEVFS_CLONE_BITMAP(tap), 183 tapclone, UID_ROOT, GID_WHEEL, 184 0600, TAP); 185 SLIST_INIT(&tap_listhead); 186 if_clone_attach(&tap_cloner); 187 break; 188 189 case MOD_UNLOAD: 190 if (taprefcnt > 0) 191 return (EBUSY); 192 193 if_clone_detach(&tap_cloner); 194 195 SLIST_FOREACH_MUTABLE(sc, &tap_listhead, tap_link, sc_tmp) 196 tapdestroy(sc); 197 198 dev_ops_remove_all(&tap_ops); 199 destroy_autoclone_dev(dev, &DEVFS_CLONE_BITMAP(tap)); 200 break; 201 202 default: 203 return (EOPNOTSUPP); 204 } 205 206 return (0); 207 } 208 209 210 /* 211 * Create or clone an interface 212 */ 213 static struct tap_softc * 214 tapcreate(cdev_t dev, int flags) 215 { 216 struct tap_softc *sc; 217 struct ifnet *ifp; 218 uint8_t ether_addr[ETHER_ADDR_LEN]; 219 int unit = minor(dev); 220 221 sc = kmalloc(sizeof(*sc), M_TAP, M_WAITOK | M_ZERO); 222 dev->si_drv1 = sc; 223 sc->tap_dev = dev; 224 sc->tap_flags |= flags; 225 226 reference_dev(dev); /* device association */ 227 228 /* generate fake MAC address: 00 bd xx xx xx unit_no */ 229 ether_addr[0] = 0x00; 230 ether_addr[1] = 0xbd; 231 bcopy(&ticks, ðer_addr[2], 3); 232 ether_addr[5] = (u_char)unit; 233 234 /* fill the rest and attach interface */ 235 ifp = &sc->tap_if; 236 if_initname(ifp, TAP, unit); 237 ifp->if_type = IFT_ETHER; 238 ifp->if_init = tapifinit; 239 ifp->if_start = tapifstart; 240 ifp->if_ioctl = tapifioctl; 241 ifp->if_mtu = ETHERMTU; 242 ifp->if_flags = TAP_IFFLAGS; 243 ifp->if_softc = sc; 244 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen); 245 ifq_set_ready(&ifp->if_snd); 246 247 ether_ifattach(ifp, ether_addr, NULL); 248 249 sc->tap_flags |= TAP_INITED; 250 sc->tap_devq.ifq_maxlen = ifqmaxlen; 251 252 SLIST_INSERT_HEAD(&tap_listhead, sc, tap_link); 253 254 TAPDEBUG(ifp, "created, minor = %#x, flags = 0x%x\n", 255 unit, sc->tap_flags); 256 return (sc); 257 } 258 259 static struct tap_softc * 260 tapfind(int unit) 261 { 262 struct tap_softc *sc; 263 264 SLIST_FOREACH(sc, &tap_listhead, tap_link) { 265 if (minor(sc->tap_dev) == unit) 266 return (sc); 267 } 268 return (NULL); 269 } 270 271 /* 272 * Create a new tap instance via ifconfig. 273 */ 274 static int 275 tap_clone_create(struct if_clone *ifc __unused, int unit, 276 caddr_t param __unused) 277 { 278 struct tap_softc *sc; 279 cdev_t dev; 280 281 sc = tapfind(unit); 282 if (sc == NULL) { 283 if (!devfs_clone_bitmap_chk(&DEVFS_CLONE_BITMAP(tap), unit)) { 284 devfs_clone_bitmap_set(&DEVFS_CLONE_BITMAP(tap), unit); 285 dev = make_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL, 286 0600, "%s%d", TAP, unit); 287 } else { 288 dev = devfs_find_device_by_name("%s%d", TAP, unit); 289 } 290 291 if (dev == NULL) 292 return (ENODEV); 293 if ((sc = tapcreate(dev, TAP_MANUALMAKE)) == NULL) 294 return (ENOMEM); 295 } else { 296 dev = sc->tap_dev; 297 } 298 299 sc->tap_flags |= TAP_CLONE; 300 TAPDEBUG(&sc->tap_if, "clone created, minor = %#x, flags = 0x%x\n", 301 minor(dev), sc->tap_flags); 302 303 return (0); 304 } 305 306 /* 307 * Open the tap device. 308 */ 309 static int 310 tapopen(struct dev_open_args *ap) 311 { 312 cdev_t dev = NULL; 313 struct tap_softc *sc = NULL; 314 struct ifnet *ifp = NULL; 315 int error; 316 317 if (tapuopen == 0 && 318 (error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) != 0) 319 return (error); 320 321 get_mplock(); 322 dev = ap->a_head.a_dev; 323 sc = dev->si_drv1; 324 if (sc == NULL && (sc = tapcreate(dev, TAP_MANUALMAKE)) == NULL) { 325 rel_mplock(); 326 return (ENOMEM); 327 } 328 if (sc->tap_flags & TAP_OPEN) { 329 rel_mplock(); 330 return (EBUSY); 331 } 332 ifp = &sc->tap_if; 333 334 if ((sc->tap_flags & TAP_CLONE) == 0) { 335 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp); 336 337 /* Announce the return of the interface. */ 338 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 339 } 340 341 bcopy(sc->arpcom.ac_enaddr, sc->ether_addr, sizeof(sc->ether_addr)); 342 343 if (curthread->td_proc) 344 fsetown(curthread->td_proc->p_pid, &sc->tap_sigtd); 345 sc->tap_flags |= TAP_OPEN; 346 taprefcnt++; 347 348 if (tapuponopen && (ifp->if_flags & IFF_UP) == 0) { 349 crit_enter(); 350 if_up(ifp); 351 crit_exit(); 352 353 ifnet_serialize_all(ifp); 354 tapifflags(sc); 355 ifnet_deserialize_all(ifp); 356 357 sc->tap_flags |= TAP_CLOSEDOWN; 358 } 359 360 TAPDEBUG(ifp, "opened, minor = %#x. Module refcnt = %d\n", 361 minor(dev), taprefcnt); 362 363 rel_mplock(); 364 return (0); 365 } 366 367 static int 368 tapclone(struct dev_clone_args *ap) 369 { 370 int unit; 371 372 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(tap), 0); 373 ap->a_dev = make_only_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL, 374 0600, "%s%d", TAP, unit); 375 if (tapcreate(ap->a_dev, 0) == NULL) 376 return (ENOMEM); 377 else 378 return (0); 379 } 380 381 /* 382 * Close the tap device: bring the interface down & delete routing info. 383 */ 384 static int 385 tapclose(struct dev_close_args *ap) 386 { 387 cdev_t dev = ap->a_head.a_dev; 388 struct tap_softc *sc = dev->si_drv1; 389 struct ifnet *ifp; 390 int unit = minor(dev); 391 int clear_flags = 0; 392 393 KASSERT(sc != NULL, 394 ("try closing the already destroyed %s%d", TAP, unit)); 395 ifp = &sc->tap_if; 396 397 get_mplock(); 398 399 /* Junk all pending output */ 400 ifq_purge_all(&ifp->if_snd); 401 402 /* 403 * If the interface is not cloned, we always bring it down. 404 * 405 * If the interface is cloned, then we bring it down during 406 * closing only if it was brought up during opening. 407 */ 408 if ((sc->tap_flags & TAP_CLONE) == 0 || 409 (sc->tap_flags & TAP_CLOSEDOWN)) { 410 if (ifp->if_flags & IFF_UP) 411 if_down(ifp); 412 clear_flags = 1; 413 } 414 ifnet_serialize_all(ifp); 415 tapifstop(sc, clear_flags); 416 ifnet_deserialize_all(ifp); 417 418 if ((sc->tap_flags & TAP_CLONE) == 0) { 419 if_purgeaddrs_nolink(ifp); 420 421 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp); 422 423 /* Announce the departure of the interface. */ 424 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 425 } 426 427 funsetown(&sc->tap_sigio); 428 sc->tap_sigio = NULL; 429 KNOTE(&sc->tap_rkq.ki_note, 0); 430 431 sc->tap_flags &= ~TAP_OPEN; 432 funsetown(&sc->tap_sigtd); 433 sc->tap_sigtd = NULL; 434 435 taprefcnt--; 436 if (taprefcnt < 0) { 437 taprefcnt = 0; 438 if_printf(ifp, ". Module refcnt = %d is out of sync! " 439 "Force refcnt to be 0.\n", taprefcnt); 440 } 441 442 TAPDEBUG(ifp, "closed, minor = %#x. Module refcnt = %d\n", 443 unit, taprefcnt); 444 445 /* Only auto-destroy if the interface was not manually created. */ 446 if ((sc->tap_flags & TAP_MANUALMAKE) == 0) { 447 tapdestroy(sc); 448 dev->si_drv1 = NULL; 449 } 450 451 rel_mplock(); 452 return (0); 453 } 454 455 456 /* 457 * Destroy a tap instance: the interface and the associated device. 458 */ 459 static void 460 tapdestroy(struct tap_softc *sc) 461 { 462 struct ifnet *ifp = &sc->tap_if; 463 cdev_t dev = sc->tap_dev; 464 int unit = minor(dev); 465 466 TAPDEBUG(ifp, "destroyed, minor = %#x. Module refcnt = %d\n", 467 unit, taprefcnt); 468 469 ifnet_serialize_all(ifp); 470 tapifstop(sc, 1); 471 ifnet_deserialize_all(ifp); 472 473 ether_ifdetach(ifp); 474 475 kprintf("TAPDESTROY UNIT %d\n", unit); 476 477 sc->tap_dev = NULL; 478 dev->si_drv1 = NULL; 479 release_dev(dev); /* device disassociation */ 480 481 /* Also destroy the cloned device */ 482 destroy_dev(dev); 483 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(tap), unit); 484 485 SLIST_REMOVE(&tap_listhead, sc, tap_softc, tap_link); 486 kfree(sc, M_TAP); 487 } 488 489 490 /* 491 * Destroy a tap instance that is created via ifconfig. 492 */ 493 static int 494 tap_clone_destroy(struct ifnet *ifp) 495 { 496 struct tap_softc *sc = ifp->if_softc; 497 498 if (sc->tap_flags & TAP_OPEN) 499 return (EBUSY); 500 if ((sc->tap_flags & TAP_CLONE) == 0) 501 return (EINVAL); 502 503 TAPDEBUG(ifp, "clone destroyed, minor = %#x, flags = 0x%x\n", 504 minor(sc->tap_dev), sc->tap_flags); 505 tapdestroy(sc); 506 507 return (0); 508 } 509 510 511 /* 512 * tapifinit 513 * 514 * Network interface initialization function (called with if serializer held) 515 * 516 * MPSAFE 517 */ 518 static void 519 tapifinit(void *xtp) 520 { 521 struct tap_softc *sc = xtp; 522 struct ifnet *ifp = &sc->tap_if; 523 struct ifaltq_subque *ifsq = ifq_get_subq_default(&ifp->if_snd); 524 525 TAPDEBUG(ifp, "initializing, minor = %#x, flags = 0x%x\n", 526 minor(sc->tap_dev), sc->tap_flags); 527 528 ASSERT_IFNET_SERIALIZED_ALL(ifp); 529 530 tapifstop(sc, 1); 531 532 ifp->if_flags |= IFF_RUNNING; 533 ifsq_clr_oactive(ifsq); 534 535 /* attempt to start output */ 536 tapifstart(ifp, ifsq); 537 } 538 539 static void 540 tapifflags(struct tap_softc *sc) 541 { 542 struct ifnet *ifp = &sc->tap_if; 543 544 ASSERT_IFNET_SERIALIZED_ALL(ifp); 545 546 if (ifp->if_flags & IFF_UP) { 547 if ((ifp->if_flags & IFF_RUNNING) == 0) 548 tapifinit(sc); 549 } else { 550 tapifstop(sc, 1); 551 } 552 } 553 554 /* 555 * tapifioctl 556 * 557 * Process an ioctl request on network interface (called with if serializer 558 * held). 559 * 560 * MPSAFE 561 */ 562 static int 563 tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 564 { 565 struct tap_softc *sc = ifp->if_softc; 566 struct ifstat *ifs = NULL; 567 struct ifmediareq *ifmr = NULL; 568 int error = 0; 569 int dummy; 570 571 switch (cmd) { 572 case SIOCADDMULTI: 573 case SIOCDELMULTI: 574 break; 575 576 case SIOCSIFADDR: 577 case SIOCGIFADDR: 578 case SIOCSIFMTU: 579 error = ether_ioctl(ifp, cmd, data); 580 break; 581 582 case SIOCSIFFLAGS: 583 tapifflags(sc); 584 break; 585 586 case SIOCGIFMEDIA: 587 /* 588 * The bridge code needs this when running the 589 * spanning tree protocol. 590 */ 591 ifmr = (struct ifmediareq *)data; 592 dummy = ifmr->ifm_count; 593 ifmr->ifm_count = 1; 594 ifmr->ifm_status = IFM_AVALID; 595 ifmr->ifm_active = IFM_ETHER; 596 if (sc->tap_flags & TAP_OPEN) 597 ifmr->ifm_status |= IFM_ACTIVE; 598 ifmr->ifm_current = ifmr->ifm_active; 599 if (dummy >= 1) { 600 int media = IFM_ETHER; 601 error = copyout(&media, ifmr->ifm_ulist, sizeof(int)); 602 } 603 break; 604 605 case SIOCGIFSTATUS: 606 ifs = (struct ifstat *)data; 607 dummy = strlen(ifs->ascii); 608 if ((sc->tap_flags & TAP_OPEN) && dummy < sizeof(ifs->ascii)) { 609 if (sc->tap_sigtd && sc->tap_sigtd->sio_proc) { 610 ksnprintf(ifs->ascii + dummy, 611 sizeof(ifs->ascii) - dummy, 612 "\tOpened by pid %d\n", 613 (int)sc->tap_sigtd->sio_proc->p_pid); 614 } else { 615 ksnprintf(ifs->ascii + dummy, 616 sizeof(ifs->ascii) - dummy, 617 "\tOpened by <unknown>\n"); 618 } 619 } 620 break; 621 622 default: 623 error = EINVAL; 624 break; 625 } 626 627 return (error); 628 } 629 630 /* 631 * tapifstart 632 * 633 * Queue packets from higher level ready to put out (called with if serializer 634 * held) 635 * 636 * MPSAFE 637 */ 638 static void 639 tapifstart(struct ifnet *ifp, struct ifaltq_subque *ifsq) 640 { 641 struct tap_softc *sc = ifp->if_softc; 642 struct ifqueue *ifq; 643 struct mbuf *m; 644 int has_data = 0; 645 646 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq); 647 TAPDEBUG(ifp, "starting, minor = %#x\n", minor(sc->tap_dev)); 648 649 if ((sc->tap_flags & TAP_READY) != TAP_READY) { 650 TAPDEBUG(ifp, "not ready, minor = %#x, flags = 0x%x\n", 651 minor(sc->tap_dev), sc->tap_flags); 652 ifsq_purge(ifsq); 653 return; 654 } 655 656 ifsq_set_oactive(ifsq); 657 658 ifq = &sc->tap_devq; 659 while ((m = ifsq_dequeue(ifsq)) != NULL) { 660 if (IF_QFULL(ifq)) { 661 IF_DROP(ifq); 662 IFNET_STAT_INC(ifp, oerrors, 1); 663 m_freem(m); 664 } else { 665 IF_ENQUEUE(ifq, m); 666 IFNET_STAT_INC(ifp, opackets, 1); 667 has_data = 1; 668 } 669 } 670 671 if (has_data) { 672 if (sc->tap_flags & TAP_RWAIT) { 673 sc->tap_flags &= ~TAP_RWAIT; 674 wakeup((caddr_t)sc); 675 } 676 677 KNOTE(&sc->tap_rkq.ki_note, 0); 678 679 if ((sc->tap_flags & TAP_ASYNC) && (sc->tap_sigio != NULL)) { 680 get_mplock(); 681 pgsigio(sc->tap_sigio, SIGIO, 0); 682 rel_mplock(); 683 } 684 } 685 686 ifsq_clr_oactive(ifsq); 687 } 688 689 static void 690 tapifstop(struct tap_softc *sc, int clear_flags) 691 { 692 struct ifnet *ifp = &sc->tap_if; 693 694 ASSERT_IFNET_SERIALIZED_ALL(ifp); 695 IF_DRAIN(&sc->tap_devq); 696 sc->tap_flags &= ~TAP_CLOSEDOWN; 697 if (clear_flags) { 698 ifp->if_flags &= ~IFF_RUNNING; 699 ifsq_clr_oactive(ifq_get_subq_default(&ifp->if_snd)); 700 } 701 } 702 703 /* 704 * tapioctl 705 * 706 * The ops interface is now pretty minimal. Called via fileops with nothing 707 * held. 708 * 709 * MPSAFE 710 */ 711 static int 712 tapioctl(struct dev_ioctl_args *ap) 713 { 714 cdev_t dev = ap->a_head.a_dev; 715 caddr_t data = ap->a_data; 716 struct tap_softc *sc = dev->si_drv1; 717 struct ifnet *ifp = &sc->tap_if; 718 struct ifreq *ifr; 719 struct tapinfo *tapp = NULL; 720 struct mbuf *mb; 721 int error; 722 723 ifnet_serialize_all(ifp); 724 error = 0; 725 726 switch (ap->a_cmd) { 727 case TAPSIFINFO: 728 tapp = (struct tapinfo *)data; 729 if (ifp->if_type != tapp->type) 730 return (EPROTOTYPE); 731 ifp->if_mtu = tapp->mtu; 732 ifp->if_baudrate = tapp->baudrate; 733 break; 734 735 case TAPGIFINFO: 736 tapp = (struct tapinfo *)data; 737 tapp->mtu = ifp->if_mtu; 738 tapp->type = ifp->if_type; 739 tapp->baudrate = ifp->if_baudrate; 740 break; 741 742 case TAPGIFNAME: 743 ifr = (struct ifreq *)data; 744 strlcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ); 745 break; 746 747 case TAPSDEBUG: 748 tapdebug = *(int *)data; 749 break; 750 751 case TAPGDEBUG: 752 *(int *)data = tapdebug; 753 break; 754 755 case FIOASYNC: 756 if (*(int *)data) 757 sc->tap_flags |= TAP_ASYNC; 758 else 759 sc->tap_flags &= ~TAP_ASYNC; 760 break; 761 762 case FIONREAD: 763 /* Take a look at devq first */ 764 IF_POLL(&sc->tap_devq, mb); 765 if (mb != NULL) { 766 *(int *)data = 0; 767 for(; mb != NULL; mb = mb->m_next) 768 *(int *)data += mb->m_len; 769 } else { 770 *(int *)data = ifsq_poll_pktlen( 771 ifq_get_subq_default(&ifp->if_snd)); 772 } 773 break; 774 775 case FIOSETOWN: 776 error = fsetown(*(int *)data, &sc->tap_sigio); 777 if (error == 0) 778 error = fsetown(*(int *)data, &sc->tap_sigtd); 779 break; 780 781 case FIOGETOWN: 782 *(int *)data = fgetown(&sc->tap_sigio); 783 break; 784 785 /* this is deprecated, FIOSETOWN should be used instead */ 786 case TIOCSPGRP: 787 error = fsetown(-(*(int *)data), &sc->tap_sigio); 788 break; 789 790 /* this is deprecated, FIOGETOWN should be used instead */ 791 case TIOCGPGRP: 792 *(int *)data = -fgetown(&sc->tap_sigio); 793 break; 794 795 /* 796 * Support basic control of the network interface via the device file. 797 * e.g., vke(4) currently uses the 'SIOCGIFADDR' ioctl. 798 */ 799 800 case SIOCGIFFLAGS: 801 bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags)); 802 break; 803 804 case SIOCGIFADDR: 805 bcopy(sc->ether_addr, data, sizeof(sc->ether_addr)); 806 break; 807 808 case SIOCSIFADDR: 809 bcopy(data, sc->ether_addr, sizeof(sc->ether_addr)); 810 break; 811 812 default: 813 error = ENOTTY; 814 break; 815 } 816 817 ifnet_deserialize_all(ifp); 818 return (error); 819 } 820 821 822 /* 823 * tapread 824 * 825 * The ops read interface - reads a packet at a time, or at 826 * least as much of a packet as can be read. 827 * 828 * Called from the fileops interface with nothing held. 829 * 830 * MPSAFE 831 */ 832 static int 833 tapread(struct dev_read_args *ap) 834 { 835 cdev_t dev = ap->a_head.a_dev; 836 struct uio *uio = ap->a_uio; 837 struct tap_softc *sc = dev->si_drv1; 838 struct ifnet *ifp = &sc->tap_if; 839 struct mbuf *m0 = NULL; 840 int error = 0, len; 841 842 TAPDEBUG(ifp, "reading, minor = %#x\n", minor(dev)); 843 844 if ((sc->tap_flags & TAP_READY) != TAP_READY) { 845 TAPDEBUG(ifp, "not ready, minor = %#x, flags = 0x%x\n", 846 minor(dev), sc->tap_flags); 847 848 return (EHOSTDOWN); 849 } 850 851 sc->tap_flags &= ~TAP_RWAIT; 852 853 /* sleep until we get a packet */ 854 do { 855 ifnet_serialize_all(ifp); 856 IF_DEQUEUE(&sc->tap_devq, m0); 857 if (m0 == NULL) { 858 if (ap->a_ioflag & IO_NDELAY) { 859 ifnet_deserialize_all(ifp); 860 return (EWOULDBLOCK); 861 } 862 sc->tap_flags |= TAP_RWAIT; 863 tsleep_interlock(sc, PCATCH); 864 ifnet_deserialize_all(ifp); 865 error = tsleep(sc, PCATCH | PINTERLOCKED, "taprd", 0); 866 if (error) 867 return (error); 868 } else { 869 ifnet_deserialize_all(ifp); 870 } 871 } while (m0 == NULL); 872 873 BPF_MTAP(ifp, m0); 874 875 /* xfer packet to user space */ 876 while ((m0 != NULL) && (uio->uio_resid > 0) && (error == 0)) { 877 len = (int)szmin(uio->uio_resid, m0->m_len); 878 if (len == 0) 879 break; 880 881 error = uiomove(mtod(m0, caddr_t), (size_t)len, uio); 882 m0 = m_free(m0); 883 } 884 885 if (m0 != NULL) { 886 TAPDEBUG(ifp, "dropping mbuf, minor = %#x\n", minor(dev)); 887 m_freem(m0); 888 } 889 890 return (error); 891 } 892 893 /* 894 * tapwrite 895 * 896 * The ops write interface - an atomic write is a packet - or else! 897 * 898 * Called from the fileops interface with nothing held. 899 * 900 * MPSAFE 901 */ 902 static int 903 tapwrite(struct dev_write_args *ap) 904 { 905 cdev_t dev = ap->a_head.a_dev; 906 struct uio *uio = ap->a_uio; 907 struct tap_softc *sc = dev->si_drv1; 908 struct ifnet *ifp = &sc->tap_if; 909 struct mbuf *top = NULL, **mp = NULL, *m = NULL; 910 int error; 911 size_t tlen, mlen; 912 913 TAPDEBUG(ifp, "writing, minor = %#x\n", minor(dev)); 914 915 if ((sc->tap_flags & TAP_READY) != TAP_READY) { 916 TAPDEBUG(ifp, "not ready, minor = %#x, flags = 0x%x\n", 917 minor(dev), sc->tap_flags); 918 return (EHOSTDOWN); 919 } 920 921 if (uio->uio_resid == 0) 922 return (0); 923 924 if (uio->uio_resid > TAPMRU) { 925 TAPDEBUG(ifp, "invalid packet len = %zu, minor = %#x\n", 926 uio->uio_resid, minor(dev)); 927 928 return (EIO); 929 } 930 tlen = uio->uio_resid; 931 932 /* get a header mbuf */ 933 MGETHDR(m, M_WAITOK, MT_DATA); 934 if (m == NULL) 935 return (ENOBUFS); 936 mlen = MHLEN; 937 938 top = NULL; 939 mp = ⊤ 940 error = 0; 941 942 while (error == 0 && uio->uio_resid > 0) { 943 m->m_len = (int)szmin(mlen, uio->uio_resid); 944 error = uiomove(mtod(m, caddr_t), (size_t)m->m_len, uio); 945 *mp = m; 946 mp = &m->m_next; 947 if (uio->uio_resid > 0) { 948 MGET(m, M_WAITOK, MT_DATA); 949 if (m == NULL) { 950 error = ENOBUFS; 951 break; 952 } 953 mlen = MLEN; 954 } 955 } 956 if (error) { 957 IFNET_STAT_INC(ifp, ierrors, 1); 958 if (top) 959 m_freem(top); 960 return (error); 961 } 962 963 top->m_pkthdr.len = (int)tlen; 964 top->m_pkthdr.rcvif = ifp; 965 966 /* 967 * Ethernet bridge and bpf are handled in ether_input 968 * 969 * adjust mbuf and give packet to the ether_input 970 */ 971 ifnet_serialize_all(ifp); 972 ifp->if_input(ifp, top, NULL, -1); 973 IFNET_STAT_INC(ifp, ipackets, 1); /* ibytes are counted in ether_input */ 974 ifnet_deserialize_all(ifp); 975 976 return (0); 977 } 978 979 980 /* 981 * tapkqfilter - called from the fileops interface with nothing held 982 * 983 * MPSAFE 984 */ 985 static int 986 tapkqfilter(struct dev_kqfilter_args *ap) 987 { 988 cdev_t dev = ap->a_head.a_dev; 989 struct knote *kn = ap->a_kn; 990 struct tap_softc *sc = dev->si_drv1; 991 struct klist *list; 992 993 list = &sc->tap_rkq.ki_note; 994 ap->a_result =0; 995 996 switch (kn->kn_filter) { 997 case EVFILT_READ: 998 kn->kn_fop = &tapread_filtops; 999 kn->kn_hook = (void *)sc; 1000 break; 1001 case EVFILT_WRITE: 1002 kn->kn_fop = &tapwrite_filtops; 1003 kn->kn_hook = (void *)sc; 1004 break; 1005 default: 1006 ap->a_result = EOPNOTSUPP; 1007 return (0); 1008 } 1009 1010 knote_insert(list, kn); 1011 return (0); 1012 } 1013 1014 static int 1015 tap_filter_read(struct knote *kn, long hint) 1016 { 1017 struct tap_softc *sc = (struct tap_softc *)kn->kn_hook; 1018 1019 if (IF_QEMPTY(&sc->tap_devq) == 0) /* XXX serializer */ 1020 return (1); 1021 else 1022 return (0); 1023 } 1024 1025 static int 1026 tap_filter_write(struct knote *kn, long hint) 1027 { 1028 /* Always ready for a write */ 1029 return (1); 1030 } 1031 1032 static void 1033 tap_filter_detach(struct knote *kn) 1034 { 1035 struct tap_softc *sc = (struct tap_softc *)kn->kn_hook; 1036 1037 knote_remove(&sc->tap_rkq.ki_note, kn); 1038 } 1039