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, 93 caddr_t, caddr_t); 94 static int tap_clone_destroy(struct ifnet *); 95 96 /* network interface */ 97 static void tapifinit(void *); 98 static void tapifstart(struct ifnet *, struct ifaltq_subque *); 99 static int tapifioctl(struct ifnet *, u_long, caddr_t, 100 struct ucred *); 101 static void tapifstop(struct tap_softc *, int); 102 static void tapifflags(struct tap_softc *); 103 104 /* character device */ 105 static d_open_t tapopen; 106 static d_clone_t tapclone; 107 static d_close_t tapclose; 108 static d_read_t tapread; 109 static d_write_t tapwrite; 110 static d_ioctl_t tapioctl; 111 static d_kqfilter_t tapkqfilter; 112 113 static struct dev_ops tap_ops = { 114 { TAP, 0, 0 }, 115 .d_open = tapopen, 116 .d_close = tapclose, 117 .d_read = tapread, 118 .d_write = tapwrite, 119 .d_ioctl = tapioctl, 120 .d_kqfilter = tapkqfilter 121 }; 122 123 /* kqueue support */ 124 static void tap_filter_detach(struct knote *); 125 static int tap_filter_read(struct knote *, long); 126 static int tap_filter_write(struct knote *, long); 127 128 static struct filterops tapread_filtops = { 129 FILTEROP_ISFD, 130 NULL, 131 tap_filter_detach, 132 tap_filter_read 133 }; 134 static struct filterops tapwrite_filtops = { 135 FILTEROP_ISFD, 136 NULL, 137 tap_filter_detach, 138 tap_filter_write 139 }; 140 141 static int tapdebug = 0; /* debug flag */ 142 static int taprefcnt = 0; /* module ref. counter */ 143 static int tapuopen = 0; /* allow user open() */ 144 static int tapuponopen = 0; /* IFF_UP when opened */ 145 146 static MALLOC_DEFINE(M_TAP, TAP, "Ethernet tunnel interface"); 147 148 static DEVFS_DEFINE_CLONE_BITMAP(tap); 149 150 struct if_clone tap_cloner = IF_CLONE_INITIALIZER( 151 TAP, tap_clone_create, tap_clone_destroy, 0, IF_MAXUNIT); 152 153 static SLIST_HEAD(,tap_softc) tap_listhead = 154 SLIST_HEAD_INITIALIZER(&tap_listhead); 155 156 SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, ""); 157 SYSCTL_DECL(_net_link); 158 SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0, 159 "Ethernet tunnel software network interface"); 160 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0, 161 "Allow user to open /dev/tap (based on node permissions)"); 162 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0, 163 "Bring interface up when /dev/tap is opened"); 164 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, ""); 165 SYSCTL_INT(_net_link_tap, OID_AUTO, refcnt, CTLFLAG_RD, &taprefcnt, 0, 166 "Number of opened devices"); 167 168 DEV_MODULE(if_tap, tapmodevent, NULL); 169 170 /* 171 * tapmodevent 172 * 173 * module event handler 174 */ 175 static int 176 tapmodevent(module_t mod, int type, void *data) 177 { 178 static cdev_t dev = NULL; 179 struct tap_softc *sc, *sc_tmp; 180 181 switch (type) { 182 case MOD_LOAD: 183 dev = make_autoclone_dev(&tap_ops, &DEVFS_CLONE_BITMAP(tap), 184 tapclone, UID_ROOT, GID_WHEEL, 185 0600, TAP); 186 SLIST_INIT(&tap_listhead); 187 if_clone_attach(&tap_cloner); 188 break; 189 190 case MOD_UNLOAD: 191 if (taprefcnt > 0) 192 return (EBUSY); 193 194 if_clone_detach(&tap_cloner); 195 196 SLIST_FOREACH_MUTABLE(sc, &tap_listhead, tap_link, sc_tmp) 197 tapdestroy(sc); 198 199 dev_ops_remove_all(&tap_ops); 200 destroy_autoclone_dev(dev, &DEVFS_CLONE_BITMAP(tap)); 201 break; 202 203 default: 204 return (EOPNOTSUPP); 205 } 206 207 return (0); 208 } 209 210 211 /* 212 * Create or clone an interface 213 */ 214 static struct tap_softc * 215 tapcreate(cdev_t dev, int flags) 216 { 217 struct tap_softc *sc; 218 struct ifnet *ifp; 219 uint8_t ether_addr[ETHER_ADDR_LEN]; 220 int unit = minor(dev); 221 222 sc = kmalloc(sizeof(*sc), M_TAP, M_WAITOK | M_ZERO); 223 dev->si_drv1 = sc; 224 sc->tap_dev = dev; 225 sc->tap_flags |= flags; 226 227 reference_dev(dev); /* device association */ 228 229 /* generate fake MAC address: 00 bd xx xx xx unit_no */ 230 ether_addr[0] = 0x00; 231 ether_addr[1] = 0xbd; 232 bcopy(&ticks, ðer_addr[2], 3); 233 ether_addr[5] = (u_char)unit; 234 235 /* fill the rest and attach interface */ 236 ifp = &sc->tap_if; 237 if_initname(ifp, TAP, unit); 238 ifp->if_type = IFT_ETHER; 239 ifp->if_init = tapifinit; 240 ifp->if_start = tapifstart; 241 ifp->if_ioctl = tapifioctl; 242 ifp->if_mtu = ETHERMTU; 243 ifp->if_flags = TAP_IFFLAGS; 244 ifp->if_softc = sc; 245 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen); 246 ifq_set_ready(&ifp->if_snd); 247 248 ether_ifattach(ifp, ether_addr, NULL); 249 250 sc->tap_flags |= TAP_INITED; 251 sc->tap_devq.ifq_maxlen = ifqmaxlen; 252 253 SLIST_INSERT_HEAD(&tap_listhead, sc, tap_link); 254 255 TAPDEBUG(ifp, "created, minor = %#x, flags = 0x%x\n", 256 unit, sc->tap_flags); 257 return (sc); 258 } 259 260 static struct tap_softc * 261 tapfind(int unit) 262 { 263 struct tap_softc *sc; 264 265 SLIST_FOREACH(sc, &tap_listhead, tap_link) { 266 if (minor(sc->tap_dev) == unit) 267 return (sc); 268 } 269 return (NULL); 270 } 271 272 /* 273 * Create a new tap instance via ifconfig. 274 */ 275 static int 276 tap_clone_create(struct if_clone *ifc __unused, int unit, 277 caddr_t params __unused, caddr_t data) 278 { 279 struct tap_softc *sc; 280 cdev_t dev = (cdev_t)data; 281 int flags; 282 283 if (tapfind(unit) != NULL) 284 return (EEXIST); 285 286 if (dev == NULL) { 287 if (!devfs_clone_bitmap_chk(&DEVFS_CLONE_BITMAP(tap), unit)) { 288 devfs_clone_bitmap_set(&DEVFS_CLONE_BITMAP(tap), unit); 289 dev = make_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL, 290 0600, "%s%d", TAP, unit); 291 } else { 292 dev = devfs_find_device_by_name("%s%d", TAP, unit); 293 if (dev == NULL) 294 return (ENOENT); 295 } 296 flags = TAP_MANUALMAKE; 297 } else { 298 flags = 0; 299 } 300 301 if ((sc = tapcreate(dev, flags)) == NULL) 302 return (ENOMEM); 303 304 sc->tap_flags |= TAP_CLONE; 305 306 TAPDEBUG(&sc->tap_if, "clone created, minor = %#x, flags = 0x%x\n", 307 minor(sc->tap_dev), sc->tap_flags); 308 309 return (0); 310 } 311 312 /* 313 * Open the tap device. 314 */ 315 static int 316 tapopen(struct dev_open_args *ap) 317 { 318 cdev_t dev = NULL; 319 struct tap_softc *sc = NULL; 320 struct ifnet *ifp = NULL; 321 int error; 322 323 if (tapuopen == 0 && 324 (error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) != 0) 325 return (error); 326 327 get_mplock(); 328 329 dev = ap->a_head.a_dev; 330 sc = dev->si_drv1; 331 if (sc == NULL && (sc = tapcreate(dev, 0)) == NULL) { 332 rel_mplock(); 333 return (ENOMEM); 334 } 335 if (sc->tap_flags & TAP_OPEN) { 336 rel_mplock(); 337 return (EBUSY); 338 } 339 340 ifp = &sc->tap_if; 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 char ifname[IFNAMSIZ]; 371 int unit; 372 373 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(tap), 0); 374 ksnprintf(ifname, IFNAMSIZ, "%s%d", TAP, unit); 375 ap->a_dev = make_only_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL, 376 0600, "%s", ifname); 377 378 /* 379 * Use the if_clone framework to create cloned device/interface, 380 * so the two clone methods (autoclone device /dev/tap; ifconfig 381 * clone) are consistent and can be mix used. 382 * 383 * Need to pass the cdev_t because the device created by 384 * 'make_only_dev()' doesn't appear in '/dev' yet so that it can't 385 * be found by 'devfs_find_device_by_name()' in 'tap_clone_create()'. 386 */ 387 return (if_clone_create(ifname, IFNAMSIZ, NULL, (caddr_t)ap->a_dev)); 388 } 389 390 /* 391 * Close the tap device: bring the interface down & delete routing info. 392 */ 393 static int 394 tapclose(struct dev_close_args *ap) 395 { 396 cdev_t dev = ap->a_head.a_dev; 397 struct tap_softc *sc = dev->si_drv1; 398 struct ifnet *ifp; 399 int unit = minor(dev); 400 int clear_flags = 0; 401 char ifname[IFNAMSIZ]; 402 403 KASSERT(sc != NULL, 404 ("try closing the already destroyed %s%d", TAP, unit)); 405 ifp = &sc->tap_if; 406 407 get_mplock(); 408 409 /* Junk all pending output */ 410 ifq_purge_all(&ifp->if_snd); 411 412 /* 413 * If the interface is not cloned, we always bring it down. 414 * 415 * If the interface is cloned, then we bring it down during 416 * closing only if it was brought up during opening. 417 */ 418 if ((sc->tap_flags & TAP_CLONE) == 0 || 419 (sc->tap_flags & TAP_CLOSEDOWN)) { 420 if (ifp->if_flags & IFF_UP) 421 if_down(ifp); 422 clear_flags = 1; 423 } 424 ifnet_serialize_all(ifp); 425 tapifstop(sc, clear_flags); 426 ifnet_deserialize_all(ifp); 427 428 if ((sc->tap_flags & TAP_MANUALMAKE) == 0) { 429 if_purgeaddrs_nolink(ifp); 430 431 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp); 432 433 /* Announce the departure of the interface. */ 434 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 435 } 436 437 funsetown(&sc->tap_sigio); 438 sc->tap_sigio = NULL; 439 KNOTE(&sc->tap_rkq.ki_note, 0); 440 441 sc->tap_flags &= ~TAP_OPEN; 442 funsetown(&sc->tap_sigtd); 443 sc->tap_sigtd = NULL; 444 445 taprefcnt--; 446 if (taprefcnt < 0) { 447 taprefcnt = 0; 448 if_printf(ifp, ". Module refcnt = %d is out of sync! " 449 "Force refcnt to be 0.\n", taprefcnt); 450 } 451 452 TAPDEBUG(ifp, "closed, minor = %#x. Module refcnt = %d\n", 453 unit, taprefcnt); 454 455 /* Only auto-destroy if the interface was not manually created. */ 456 if ((sc->tap_flags & TAP_MANUALMAKE) == 0) { 457 ksnprintf(ifname, IFNAMSIZ, "%s%d", TAP, unit); 458 if_clone_destroy(ifname); 459 } 460 461 rel_mplock(); 462 return (0); 463 } 464 465 466 /* 467 * Destroy a tap instance: the interface and the associated device. 468 */ 469 static void 470 tapdestroy(struct tap_softc *sc) 471 { 472 struct ifnet *ifp = &sc->tap_if; 473 cdev_t dev = sc->tap_dev; 474 int unit = minor(dev); 475 476 TAPDEBUG(ifp, "destroyed, minor = %#x. Module refcnt = %d\n", 477 unit, taprefcnt); 478 479 ifnet_serialize_all(ifp); 480 tapifstop(sc, 1); 481 ifnet_deserialize_all(ifp); 482 ether_ifdetach(ifp); 483 484 sc->tap_dev = NULL; 485 dev->si_drv1 = NULL; 486 release_dev(dev); /* device disassociation */ 487 488 /* Also destroy the cloned device */ 489 destroy_dev(dev); 490 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(tap), unit); 491 492 SLIST_REMOVE(&tap_listhead, sc, tap_softc, tap_link); 493 kfree(sc, M_TAP); 494 } 495 496 497 /* 498 * Destroy a tap instance that is created via ifconfig. 499 */ 500 static int 501 tap_clone_destroy(struct ifnet *ifp) 502 { 503 struct tap_softc *sc = ifp->if_softc; 504 505 if (sc->tap_flags & TAP_OPEN) 506 return (EBUSY); 507 if ((sc->tap_flags & TAP_CLONE) == 0) 508 return (EINVAL); 509 510 TAPDEBUG(ifp, "clone destroyed, minor = %#x, flags = 0x%x\n", 511 minor(sc->tap_dev), sc->tap_flags); 512 tapdestroy(sc); 513 514 return (0); 515 } 516 517 518 /* 519 * tapifinit 520 * 521 * Network interface initialization function (called with if serializer held) 522 * 523 * MPSAFE 524 */ 525 static void 526 tapifinit(void *xtp) 527 { 528 struct tap_softc *sc = xtp; 529 struct ifnet *ifp = &sc->tap_if; 530 struct ifaltq_subque *ifsq = ifq_get_subq_default(&ifp->if_snd); 531 532 TAPDEBUG(ifp, "initializing, minor = %#x, flags = 0x%x\n", 533 minor(sc->tap_dev), sc->tap_flags); 534 535 ASSERT_IFNET_SERIALIZED_ALL(ifp); 536 537 tapifstop(sc, 1); 538 539 ifp->if_flags |= IFF_RUNNING; 540 ifsq_clr_oactive(ifsq); 541 542 /* attempt to start output */ 543 tapifstart(ifp, ifsq); 544 } 545 546 static void 547 tapifflags(struct tap_softc *sc) 548 { 549 struct ifnet *ifp = &sc->tap_if; 550 551 ASSERT_IFNET_SERIALIZED_ALL(ifp); 552 553 if (ifp->if_flags & IFF_UP) { 554 if ((ifp->if_flags & IFF_RUNNING) == 0) 555 tapifinit(sc); 556 } else { 557 tapifstop(sc, 1); 558 } 559 } 560 561 /* 562 * tapifioctl 563 * 564 * Process an ioctl request on network interface (called with if serializer 565 * held). 566 * 567 * MPSAFE 568 */ 569 static int 570 tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 571 { 572 struct tap_softc *sc = ifp->if_softc; 573 struct ifreq *ifr = NULL; 574 struct ifstat *ifs = NULL; 575 struct ifmediareq *ifmr = NULL; 576 int error = 0; 577 int dummy; 578 579 switch (cmd) { 580 case SIOCADDMULTI: 581 case SIOCDELMULTI: 582 break; 583 584 case SIOCSIFMTU: 585 ifr = (struct ifreq *)data; 586 ifp->if_mtu = ifr->ifr_mtu; 587 TAPDEBUG(ifp, "mtu set\n"); 588 break; 589 590 case SIOCSIFADDR: 591 case SIOCGIFADDR: 592 error = ether_ioctl(ifp, cmd, data); 593 break; 594 595 case SIOCSIFFLAGS: 596 tapifflags(sc); 597 break; 598 599 case SIOCGIFMEDIA: 600 /* 601 * The bridge code needs this when running the 602 * spanning tree protocol. 603 */ 604 ifmr = (struct ifmediareq *)data; 605 dummy = ifmr->ifm_count; 606 ifmr->ifm_count = 1; 607 ifmr->ifm_status = IFM_AVALID; 608 ifmr->ifm_active = IFM_ETHER; 609 if (sc->tap_flags & TAP_OPEN) 610 ifmr->ifm_status |= IFM_ACTIVE; 611 ifmr->ifm_current = ifmr->ifm_active; 612 if (dummy >= 1) { 613 int media = IFM_ETHER; 614 error = copyout(&media, ifmr->ifm_ulist, sizeof(int)); 615 } 616 break; 617 618 case SIOCGIFSTATUS: 619 ifs = (struct ifstat *)data; 620 dummy = strlen(ifs->ascii); 621 if ((sc->tap_flags & TAP_OPEN) && dummy < sizeof(ifs->ascii)) { 622 if (sc->tap_sigtd && sc->tap_sigtd->sio_proc) { 623 ksnprintf(ifs->ascii + dummy, 624 sizeof(ifs->ascii) - dummy, 625 "\tOpened by pid %d\n", 626 (int)sc->tap_sigtd->sio_proc->p_pid); 627 } else { 628 ksnprintf(ifs->ascii + dummy, 629 sizeof(ifs->ascii) - dummy, 630 "\tOpened by <unknown>\n"); 631 } 632 } 633 break; 634 635 default: 636 error = EINVAL; 637 break; 638 } 639 640 return (error); 641 } 642 643 /* 644 * tapifstart 645 * 646 * Queue packets from higher level ready to put out (called with if serializer 647 * held) 648 * 649 * MPSAFE 650 */ 651 static void 652 tapifstart(struct ifnet *ifp, struct ifaltq_subque *ifsq) 653 { 654 struct tap_softc *sc = ifp->if_softc; 655 struct ifqueue *ifq; 656 struct mbuf *m; 657 int has_data = 0; 658 659 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq); 660 TAPDEBUG(ifp, "starting, minor = %#x\n", minor(sc->tap_dev)); 661 662 if ((sc->tap_flags & TAP_READY) != TAP_READY) { 663 TAPDEBUG(ifp, "not ready, minor = %#x, flags = 0x%x\n", 664 minor(sc->tap_dev), sc->tap_flags); 665 ifsq_purge(ifsq); 666 return; 667 } 668 669 ifsq_set_oactive(ifsq); 670 671 ifq = &sc->tap_devq; 672 while ((m = ifsq_dequeue(ifsq)) != NULL) { 673 if (IF_QFULL(ifq)) { 674 IF_DROP(ifq); 675 IFNET_STAT_INC(ifp, oerrors, 1); 676 m_freem(m); 677 } else { 678 IF_ENQUEUE(ifq, m); 679 IFNET_STAT_INC(ifp, opackets, 1); 680 has_data = 1; 681 } 682 } 683 684 if (has_data) { 685 if (sc->tap_flags & TAP_RWAIT) { 686 sc->tap_flags &= ~TAP_RWAIT; 687 wakeup((caddr_t)sc); 688 } 689 690 KNOTE(&sc->tap_rkq.ki_note, 0); 691 692 if ((sc->tap_flags & TAP_ASYNC) && (sc->tap_sigio != NULL)) { 693 get_mplock(); 694 pgsigio(sc->tap_sigio, SIGIO, 0); 695 rel_mplock(); 696 } 697 } 698 699 ifsq_clr_oactive(ifsq); 700 } 701 702 static void 703 tapifstop(struct tap_softc *sc, int clear_flags) 704 { 705 struct ifnet *ifp = &sc->tap_if; 706 707 ASSERT_IFNET_SERIALIZED_ALL(ifp); 708 IF_DRAIN(&sc->tap_devq); 709 sc->tap_flags &= ~TAP_CLOSEDOWN; 710 if (clear_flags) { 711 ifp->if_flags &= ~IFF_RUNNING; 712 ifsq_clr_oactive(ifq_get_subq_default(&ifp->if_snd)); 713 } 714 } 715 716 /* 717 * tapioctl 718 * 719 * The ops interface is now pretty minimal. Called via fileops with nothing 720 * held. 721 * 722 * MPSAFE 723 */ 724 static int 725 tapioctl(struct dev_ioctl_args *ap) 726 { 727 cdev_t dev = ap->a_head.a_dev; 728 caddr_t data = ap->a_data; 729 struct tap_softc *sc = dev->si_drv1; 730 struct ifnet *ifp = &sc->tap_if; 731 struct ifreq *ifr; 732 struct tapinfo *tapp = NULL; 733 struct mbuf *mb; 734 int error; 735 736 ifnet_serialize_all(ifp); 737 error = 0; 738 739 switch (ap->a_cmd) { 740 case TAPSIFINFO: 741 tapp = (struct tapinfo *)data; 742 if (ifp->if_type != tapp->type) 743 return (EPROTOTYPE); 744 ifp->if_mtu = tapp->mtu; 745 ifp->if_baudrate = tapp->baudrate; 746 break; 747 748 case TAPGIFINFO: 749 tapp = (struct tapinfo *)data; 750 tapp->mtu = ifp->if_mtu; 751 tapp->type = ifp->if_type; 752 tapp->baudrate = ifp->if_baudrate; 753 break; 754 755 case TAPGIFNAME: 756 ifr = (struct ifreq *)data; 757 strlcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ); 758 break; 759 760 case TAPSDEBUG: 761 tapdebug = *(int *)data; 762 break; 763 764 case TAPGDEBUG: 765 *(int *)data = tapdebug; 766 break; 767 768 case FIOASYNC: 769 if (*(int *)data) 770 sc->tap_flags |= TAP_ASYNC; 771 else 772 sc->tap_flags &= ~TAP_ASYNC; 773 break; 774 775 case FIONREAD: 776 /* Take a look at devq first */ 777 IF_POLL(&sc->tap_devq, mb); 778 if (mb != NULL) { 779 *(int *)data = 0; 780 for(; mb != NULL; mb = mb->m_next) 781 *(int *)data += mb->m_len; 782 } else { 783 *(int *)data = ifsq_poll_pktlen( 784 ifq_get_subq_default(&ifp->if_snd)); 785 } 786 break; 787 788 case FIOSETOWN: 789 error = fsetown(*(int *)data, &sc->tap_sigio); 790 if (error == 0) 791 error = fsetown(*(int *)data, &sc->tap_sigtd); 792 break; 793 794 case FIOGETOWN: 795 *(int *)data = fgetown(&sc->tap_sigio); 796 break; 797 798 /* this is deprecated, FIOSETOWN should be used instead */ 799 case TIOCSPGRP: 800 error = fsetown(-(*(int *)data), &sc->tap_sigio); 801 break; 802 803 /* this is deprecated, FIOGETOWN should be used instead */ 804 case TIOCGPGRP: 805 *(int *)data = -fgetown(&sc->tap_sigio); 806 break; 807 808 /* 809 * Support basic control of the network interface via the device file. 810 * e.g., vke(4) currently uses the 'SIOCGIFADDR' ioctl. 811 */ 812 813 case SIOCGIFFLAGS: 814 bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags)); 815 break; 816 817 case SIOCGIFADDR: 818 bcopy(sc->ether_addr, data, sizeof(sc->ether_addr)); 819 break; 820 821 case SIOCSIFADDR: 822 bcopy(data, sc->ether_addr, sizeof(sc->ether_addr)); 823 break; 824 825 default: 826 error = ENOTTY; 827 break; 828 } 829 830 ifnet_deserialize_all(ifp); 831 return (error); 832 } 833 834 835 /* 836 * tapread 837 * 838 * The ops read interface - reads a packet at a time, or at 839 * least as much of a packet as can be read. 840 * 841 * Called from the fileops interface with nothing held. 842 * 843 * MPSAFE 844 */ 845 static int 846 tapread(struct dev_read_args *ap) 847 { 848 cdev_t dev = ap->a_head.a_dev; 849 struct uio *uio = ap->a_uio; 850 struct tap_softc *sc = dev->si_drv1; 851 struct ifnet *ifp = &sc->tap_if; 852 struct mbuf *m0 = NULL; 853 int error = 0, len; 854 855 TAPDEBUG(ifp, "reading, minor = %#x\n", minor(dev)); 856 857 if ((sc->tap_flags & TAP_READY) != TAP_READY) { 858 TAPDEBUG(ifp, "not ready, minor = %#x, flags = 0x%x\n", 859 minor(dev), sc->tap_flags); 860 861 return (EHOSTDOWN); 862 } 863 864 sc->tap_flags &= ~TAP_RWAIT; 865 866 /* sleep until we get a packet */ 867 do { 868 ifnet_serialize_all(ifp); 869 IF_DEQUEUE(&sc->tap_devq, m0); 870 if (m0 == NULL) { 871 if (ap->a_ioflag & IO_NDELAY) { 872 ifnet_deserialize_all(ifp); 873 return (EWOULDBLOCK); 874 } 875 sc->tap_flags |= TAP_RWAIT; 876 tsleep_interlock(sc, PCATCH); 877 ifnet_deserialize_all(ifp); 878 error = tsleep(sc, PCATCH | PINTERLOCKED, "taprd", 0); 879 if (error) 880 return (error); 881 } else { 882 ifnet_deserialize_all(ifp); 883 } 884 } while (m0 == NULL); 885 886 BPF_MTAP(ifp, m0); 887 888 /* xfer packet to user space */ 889 while ((m0 != NULL) && (uio->uio_resid > 0) && (error == 0)) { 890 len = (int)szmin(uio->uio_resid, m0->m_len); 891 if (len == 0) 892 break; 893 894 error = uiomove(mtod(m0, caddr_t), (size_t)len, uio); 895 m0 = m_free(m0); 896 } 897 898 if (m0 != NULL) { 899 TAPDEBUG(ifp, "dropping mbuf, minor = %#x\n", minor(dev)); 900 m_freem(m0); 901 } 902 903 return (error); 904 } 905 906 /* 907 * tapwrite 908 * 909 * The ops write interface - an atomic write is a packet - or else! 910 * 911 * Called from the fileops interface with nothing held. 912 * 913 * MPSAFE 914 */ 915 static int 916 tapwrite(struct dev_write_args *ap) 917 { 918 cdev_t dev = ap->a_head.a_dev; 919 struct uio *uio = ap->a_uio; 920 struct tap_softc *sc = dev->si_drv1; 921 struct ifnet *ifp = &sc->tap_if; 922 struct mbuf *top = NULL, **mp = NULL, *m = NULL; 923 int error; 924 size_t tlen, mlen; 925 926 TAPDEBUG(ifp, "writing, minor = %#x\n", minor(dev)); 927 928 if ((sc->tap_flags & TAP_READY) != TAP_READY) { 929 TAPDEBUG(ifp, "not ready, minor = %#x, flags = 0x%x\n", 930 minor(dev), sc->tap_flags); 931 return (EHOSTDOWN); 932 } 933 934 if (uio->uio_resid == 0) 935 return (0); 936 937 if (uio->uio_resid > TAPMRU) { 938 TAPDEBUG(ifp, "invalid packet len = %zu, minor = %#x\n", 939 uio->uio_resid, minor(dev)); 940 941 return (EIO); 942 } 943 tlen = uio->uio_resid; 944 945 /* get a header mbuf */ 946 MGETHDR(m, M_WAITOK, MT_DATA); 947 if (m == NULL) 948 return (ENOBUFS); 949 mlen = MHLEN; 950 951 top = NULL; 952 mp = ⊤ 953 error = 0; 954 955 while (error == 0 && uio->uio_resid > 0) { 956 m->m_len = (int)szmin(mlen, uio->uio_resid); 957 error = uiomove(mtod(m, caddr_t), (size_t)m->m_len, uio); 958 *mp = m; 959 mp = &m->m_next; 960 if (uio->uio_resid > 0) { 961 MGET(m, M_WAITOK, MT_DATA); 962 if (m == NULL) { 963 error = ENOBUFS; 964 break; 965 } 966 mlen = MLEN; 967 } 968 } 969 if (error) { 970 IFNET_STAT_INC(ifp, ierrors, 1); 971 if (top) 972 m_freem(top); 973 return (error); 974 } 975 976 top->m_pkthdr.len = (int)tlen; 977 top->m_pkthdr.rcvif = ifp; 978 979 /* 980 * Ethernet bridge and bpf are handled in ether_input 981 * 982 * adjust mbuf and give packet to the ether_input 983 */ 984 ifnet_serialize_all(ifp); 985 ifp->if_input(ifp, top, NULL, -1); 986 IFNET_STAT_INC(ifp, ipackets, 1); /* ibytes are counted in ether_input */ 987 ifnet_deserialize_all(ifp); 988 989 return (0); 990 } 991 992 993 /* 994 * tapkqfilter - called from the fileops interface with nothing held 995 * 996 * MPSAFE 997 */ 998 static int 999 tapkqfilter(struct dev_kqfilter_args *ap) 1000 { 1001 cdev_t dev = ap->a_head.a_dev; 1002 struct knote *kn = ap->a_kn; 1003 struct tap_softc *sc = dev->si_drv1; 1004 struct klist *list; 1005 1006 list = &sc->tap_rkq.ki_note; 1007 ap->a_result =0; 1008 1009 switch (kn->kn_filter) { 1010 case EVFILT_READ: 1011 kn->kn_fop = &tapread_filtops; 1012 kn->kn_hook = (void *)sc; 1013 break; 1014 case EVFILT_WRITE: 1015 kn->kn_fop = &tapwrite_filtops; 1016 kn->kn_hook = (void *)sc; 1017 break; 1018 default: 1019 ap->a_result = EOPNOTSUPP; 1020 return (0); 1021 } 1022 1023 knote_insert(list, kn); 1024 return (0); 1025 } 1026 1027 static int 1028 tap_filter_read(struct knote *kn, long hint) 1029 { 1030 struct tap_softc *sc = (struct tap_softc *)kn->kn_hook; 1031 1032 if (IF_QEMPTY(&sc->tap_devq) == 0) /* XXX serializer */ 1033 return (1); 1034 else 1035 return (0); 1036 } 1037 1038 static int 1039 tap_filter_write(struct knote *kn, long hint) 1040 { 1041 /* Always ready for a write */ 1042 return (1); 1043 } 1044 1045 static void 1046 tap_filter_detach(struct knote *kn) 1047 { 1048 struct tap_softc *sc = (struct tap_softc *)kn->kn_hook; 1049 1050 knote_remove(&sc->tap_rkq.ki_note, kn); 1051 } 1052