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/caps.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 = caps_priv_check(ap->a_cred, SYSCAP_RESTRICTEDROOT)) != 0) 325 { 326 return (error); 327 } 328 329 get_mplock(); 330 331 dev = ap->a_head.a_dev; 332 sc = dev->si_drv1; 333 if (sc == NULL && (sc = tapcreate(dev, 0)) == NULL) { 334 rel_mplock(); 335 return (ENOMEM); 336 } 337 if (sc->tap_flags & TAP_OPEN) { 338 rel_mplock(); 339 return (EBUSY); 340 } 341 342 ifp = &sc->tap_if; 343 bcopy(sc->arpcom.ac_enaddr, sc->ether_addr, sizeof(sc->ether_addr)); 344 345 if (curthread->td_proc) 346 fsetown(curthread->td_proc->p_pid, &sc->tap_sigtd); 347 sc->tap_flags |= TAP_OPEN; 348 taprefcnt++; 349 350 if (tapuponopen && (ifp->if_flags & IFF_UP) == 0) { 351 crit_enter(); 352 if_up(ifp); 353 crit_exit(); 354 355 ifnet_serialize_all(ifp); 356 tapifflags(sc); 357 ifnet_deserialize_all(ifp); 358 359 sc->tap_flags |= TAP_CLOSEDOWN; 360 } 361 362 TAPDEBUG(ifp, "opened, minor = %#x. Module refcnt = %d\n", 363 minor(dev), taprefcnt); 364 365 rel_mplock(); 366 return (0); 367 } 368 369 static int 370 tapclone(struct dev_clone_args *ap) 371 { 372 char ifname[IFNAMSIZ]; 373 int unit; 374 375 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(tap), 0); 376 ksnprintf(ifname, IFNAMSIZ, "%s%d", TAP, unit); 377 ap->a_dev = make_only_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL, 378 0600, "%s", ifname); 379 380 /* 381 * Use the if_clone framework to create cloned device/interface, 382 * so the two clone methods (autoclone device /dev/tap; ifconfig 383 * clone) are consistent and can be mix used. 384 * 385 * Need to pass the cdev_t because the device created by 386 * 'make_only_dev()' doesn't appear in '/dev' yet so that it can't 387 * be found by 'devfs_find_device_by_name()' in 'tap_clone_create()'. 388 */ 389 return (if_clone_create(ifname, IFNAMSIZ, NULL, (caddr_t)ap->a_dev)); 390 } 391 392 /* 393 * Close the tap device: bring the interface down & delete routing info. 394 */ 395 static int 396 tapclose(struct dev_close_args *ap) 397 { 398 cdev_t dev = ap->a_head.a_dev; 399 struct tap_softc *sc = dev->si_drv1; 400 struct ifnet *ifp; 401 int unit = minor(dev); 402 int clear_flags = 0; 403 char ifname[IFNAMSIZ]; 404 405 KASSERT(sc != NULL, 406 ("try closing the already destroyed %s%d", TAP, unit)); 407 ifp = &sc->tap_if; 408 409 get_mplock(); 410 411 /* Junk all pending output */ 412 ifq_purge_all(&ifp->if_snd); 413 414 /* 415 * If the interface is not cloned, we always bring it down. 416 * 417 * If the interface is cloned, then we bring it down during 418 * closing only if it was brought up during opening. 419 */ 420 if ((sc->tap_flags & TAP_CLONE) == 0 || 421 (sc->tap_flags & TAP_CLOSEDOWN)) { 422 if (ifp->if_flags & IFF_UP) 423 if_down(ifp); 424 clear_flags = 1; 425 } 426 ifnet_serialize_all(ifp); 427 tapifstop(sc, clear_flags); 428 ifnet_deserialize_all(ifp); 429 430 if ((sc->tap_flags & TAP_MANUALMAKE) == 0) { 431 if_purgeaddrs_nolink(ifp); 432 433 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp); 434 435 /* Announce the departure of the interface. */ 436 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 437 } 438 439 funsetown(&sc->tap_sigio); 440 sc->tap_sigio = NULL; 441 KNOTE(&sc->tap_rkq.ki_note, 0); 442 443 sc->tap_flags &= ~TAP_OPEN; 444 funsetown(&sc->tap_sigtd); 445 sc->tap_sigtd = NULL; 446 447 taprefcnt--; 448 if (taprefcnt < 0) { 449 taprefcnt = 0; 450 if_printf(ifp, ". Module refcnt = %d is out of sync! " 451 "Force refcnt to be 0.\n", taprefcnt); 452 } 453 454 TAPDEBUG(ifp, "closed, minor = %#x. Module refcnt = %d\n", 455 unit, taprefcnt); 456 457 /* Only auto-destroy if the interface was not manually created. */ 458 if ((sc->tap_flags & TAP_MANUALMAKE) == 0) { 459 ksnprintf(ifname, IFNAMSIZ, "%s%d", TAP, unit); 460 if_clone_destroy(ifname); 461 } 462 463 rel_mplock(); 464 return (0); 465 } 466 467 468 /* 469 * Destroy a tap instance: the interface and the associated device. 470 */ 471 static void 472 tapdestroy(struct tap_softc *sc) 473 { 474 struct ifnet *ifp = &sc->tap_if; 475 cdev_t dev = sc->tap_dev; 476 int unit = minor(dev); 477 478 TAPDEBUG(ifp, "destroyed, minor = %#x. Module refcnt = %d\n", 479 unit, taprefcnt); 480 481 ifnet_serialize_all(ifp); 482 tapifstop(sc, 1); 483 ifnet_deserialize_all(ifp); 484 ether_ifdetach(ifp); 485 486 sc->tap_dev = NULL; 487 dev->si_drv1 = NULL; 488 release_dev(dev); /* device disassociation */ 489 490 /* Also destroy the cloned device */ 491 destroy_dev(dev); 492 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(tap), unit); 493 494 SLIST_REMOVE(&tap_listhead, sc, tap_softc, tap_link); 495 kfree(sc, M_TAP); 496 } 497 498 499 /* 500 * Destroy a tap instance that is created via ifconfig. 501 */ 502 static int 503 tap_clone_destroy(struct ifnet *ifp) 504 { 505 struct tap_softc *sc = ifp->if_softc; 506 507 if (sc->tap_flags & TAP_OPEN) 508 return (EBUSY); 509 if ((sc->tap_flags & TAP_CLONE) == 0) 510 return (EINVAL); 511 512 TAPDEBUG(ifp, "clone destroyed, minor = %#x, flags = 0x%x\n", 513 minor(sc->tap_dev), sc->tap_flags); 514 tapdestroy(sc); 515 516 return (0); 517 } 518 519 520 /* 521 * tapifinit 522 * 523 * Network interface initialization function (called with if serializer held) 524 * 525 * MPSAFE 526 */ 527 static void 528 tapifinit(void *xtp) 529 { 530 struct tap_softc *sc = xtp; 531 struct ifnet *ifp = &sc->tap_if; 532 struct ifaltq_subque *ifsq = ifq_get_subq_default(&ifp->if_snd); 533 534 TAPDEBUG(ifp, "initializing, minor = %#x, flags = 0x%x\n", 535 minor(sc->tap_dev), sc->tap_flags); 536 537 ASSERT_IFNET_SERIALIZED_ALL(ifp); 538 539 tapifstop(sc, 1); 540 541 ifp->if_flags |= IFF_RUNNING; 542 ifsq_clr_oactive(ifsq); 543 544 /* attempt to start output */ 545 tapifstart(ifp, ifsq); 546 } 547 548 static void 549 tapifflags(struct tap_softc *sc) 550 { 551 struct ifnet *ifp = &sc->tap_if; 552 553 ASSERT_IFNET_SERIALIZED_ALL(ifp); 554 555 if (ifp->if_flags & IFF_UP) { 556 if ((ifp->if_flags & IFF_RUNNING) == 0) 557 tapifinit(sc); 558 } else { 559 tapifstop(sc, 1); 560 } 561 } 562 563 /* 564 * tapifioctl 565 * 566 * Process an ioctl request on network interface (called with if serializer 567 * held). 568 * 569 * MPSAFE 570 */ 571 static int 572 tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 573 { 574 struct tap_softc *sc = ifp->if_softc; 575 struct ifreq *ifr = NULL; 576 struct ifstat *ifs = NULL; 577 struct ifmediareq *ifmr = NULL; 578 int error = 0; 579 int dummy; 580 581 switch (cmd) { 582 case SIOCADDMULTI: 583 case SIOCDELMULTI: 584 break; 585 586 case SIOCSIFMTU: 587 ifr = (struct ifreq *)data; 588 ifp->if_mtu = ifr->ifr_mtu; 589 TAPDEBUG(ifp, "mtu set\n"); 590 break; 591 592 case SIOCSIFADDR: 593 case SIOCGIFADDR: 594 error = ether_ioctl(ifp, cmd, data); 595 break; 596 597 case SIOCSIFFLAGS: 598 tapifflags(sc); 599 break; 600 601 case SIOCGIFMEDIA: 602 /* 603 * The bridge code needs this when running the 604 * spanning tree protocol. 605 */ 606 ifmr = (struct ifmediareq *)data; 607 dummy = ifmr->ifm_count; 608 ifmr->ifm_count = 1; 609 ifmr->ifm_status = IFM_AVALID; 610 ifmr->ifm_active = IFM_ETHER; 611 if (sc->tap_flags & TAP_OPEN) 612 ifmr->ifm_status |= IFM_ACTIVE; 613 ifmr->ifm_current = ifmr->ifm_active; 614 if (dummy >= 1) { 615 int media = IFM_ETHER; 616 error = copyout(&media, ifmr->ifm_ulist, sizeof(int)); 617 } 618 break; 619 620 case SIOCGIFSTATUS: 621 ifs = (struct ifstat *)data; 622 dummy = strlen(ifs->ascii); 623 if ((sc->tap_flags & TAP_OPEN) && dummy < sizeof(ifs->ascii)) { 624 if (sc->tap_sigtd && sc->tap_sigtd->sio_proc) { 625 ksnprintf(ifs->ascii + dummy, 626 sizeof(ifs->ascii) - dummy, 627 "\tOpened by pid %d\n", 628 (int)sc->tap_sigtd->sio_proc->p_pid); 629 } else { 630 ksnprintf(ifs->ascii + dummy, 631 sizeof(ifs->ascii) - dummy, 632 "\tOpened by <unknown>\n"); 633 } 634 } 635 break; 636 637 default: 638 error = EINVAL; 639 break; 640 } 641 642 return (error); 643 } 644 645 /* 646 * tapifstart 647 * 648 * Queue packets from higher level ready to put out (called with if serializer 649 * held) 650 * 651 * MPSAFE 652 */ 653 static void 654 tapifstart(struct ifnet *ifp, struct ifaltq_subque *ifsq) 655 { 656 struct tap_softc *sc = ifp->if_softc; 657 struct ifqueue *ifq; 658 struct mbuf *m; 659 int has_data = 0; 660 661 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq); 662 TAPDEBUG(ifp, "starting, minor = %#x\n", minor(sc->tap_dev)); 663 664 if ((sc->tap_flags & TAP_READY) != TAP_READY) { 665 TAPDEBUG(ifp, "not ready, minor = %#x, flags = 0x%x\n", 666 minor(sc->tap_dev), sc->tap_flags); 667 ifsq_purge(ifsq); 668 return; 669 } 670 671 ifsq_set_oactive(ifsq); 672 673 ifq = &sc->tap_devq; 674 while ((m = ifsq_dequeue(ifsq)) != NULL) { 675 if (IF_QFULL(ifq)) { 676 IF_DROP(ifq); 677 IFNET_STAT_INC(ifp, oerrors, 1); 678 m_freem(m); 679 } else { 680 IF_ENQUEUE(ifq, m); 681 IFNET_STAT_INC(ifp, opackets, 1); 682 has_data = 1; 683 } 684 } 685 686 if (has_data) { 687 if (sc->tap_flags & TAP_RWAIT) { 688 sc->tap_flags &= ~TAP_RWAIT; 689 wakeup((caddr_t)sc); 690 } 691 692 KNOTE(&sc->tap_rkq.ki_note, 0); 693 694 if ((sc->tap_flags & TAP_ASYNC) && (sc->tap_sigio != NULL)) { 695 get_mplock(); 696 pgsigio(sc->tap_sigio, SIGIO, 0); 697 rel_mplock(); 698 } 699 } 700 701 ifsq_clr_oactive(ifsq); 702 } 703 704 static void 705 tapifstop(struct tap_softc *sc, int clear_flags) 706 { 707 struct ifnet *ifp = &sc->tap_if; 708 709 ASSERT_IFNET_SERIALIZED_ALL(ifp); 710 IF_DRAIN(&sc->tap_devq); 711 sc->tap_flags &= ~TAP_CLOSEDOWN; 712 if (clear_flags) { 713 ifp->if_flags &= ~IFF_RUNNING; 714 ifsq_clr_oactive(ifq_get_subq_default(&ifp->if_snd)); 715 } 716 } 717 718 /* 719 * tapioctl 720 * 721 * The ops interface is now pretty minimal. Called via fileops with nothing 722 * held. 723 * 724 * MPSAFE 725 */ 726 static int 727 tapioctl(struct dev_ioctl_args *ap) 728 { 729 cdev_t dev = ap->a_head.a_dev; 730 caddr_t data = ap->a_data; 731 struct tap_softc *sc = dev->si_drv1; 732 struct ifnet *ifp = &sc->tap_if; 733 struct ifreq *ifr; 734 struct tapinfo *tapp = NULL; 735 struct mbuf *mb; 736 int error; 737 738 ifnet_serialize_all(ifp); 739 error = 0; 740 741 switch (ap->a_cmd) { 742 case TAPSIFINFO: 743 tapp = (struct tapinfo *)data; 744 if (ifp->if_type != tapp->type) 745 return (EPROTOTYPE); 746 ifp->if_mtu = tapp->mtu; 747 ifp->if_baudrate = tapp->baudrate; 748 break; 749 750 case TAPGIFINFO: 751 tapp = (struct tapinfo *)data; 752 tapp->mtu = ifp->if_mtu; 753 tapp->type = ifp->if_type; 754 tapp->baudrate = ifp->if_baudrate; 755 break; 756 757 case TAPGIFNAME: 758 ifr = (struct ifreq *)data; 759 strlcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ); 760 break; 761 762 case TAPSDEBUG: 763 tapdebug = *(int *)data; 764 break; 765 766 case TAPGDEBUG: 767 *(int *)data = tapdebug; 768 break; 769 770 case FIOASYNC: 771 if (*(int *)data) 772 sc->tap_flags |= TAP_ASYNC; 773 else 774 sc->tap_flags &= ~TAP_ASYNC; 775 break; 776 777 case FIONREAD: 778 /* Take a look at devq first */ 779 IF_POLL(&sc->tap_devq, mb); 780 if (mb != NULL) { 781 *(int *)data = 0; 782 for(; mb != NULL; mb = mb->m_next) 783 *(int *)data += mb->m_len; 784 } else { 785 *(int *)data = ifsq_poll_pktlen( 786 ifq_get_subq_default(&ifp->if_snd)); 787 } 788 break; 789 790 case FIOSETOWN: 791 error = fsetown(*(int *)data, &sc->tap_sigio); 792 if (error == 0) 793 error = fsetown(*(int *)data, &sc->tap_sigtd); 794 break; 795 796 case FIOGETOWN: 797 *(int *)data = fgetown(&sc->tap_sigio); 798 break; 799 800 /* this is deprecated, FIOSETOWN should be used instead */ 801 case TIOCSPGRP: 802 error = fsetown(-(*(int *)data), &sc->tap_sigio); 803 break; 804 805 /* this is deprecated, FIOGETOWN should be used instead */ 806 case TIOCGPGRP: 807 *(int *)data = -fgetown(&sc->tap_sigio); 808 break; 809 810 /* 811 * Support basic control of the network interface via the device file. 812 * e.g., vke(4) currently uses the 'SIOCGIFADDR' ioctl. 813 */ 814 815 case SIOCGIFFLAGS: 816 bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags)); 817 break; 818 819 case SIOCGIFADDR: 820 bcopy(sc->ether_addr, data, sizeof(sc->ether_addr)); 821 break; 822 823 case SIOCSIFADDR: 824 bcopy(data, sc->ether_addr, sizeof(sc->ether_addr)); 825 break; 826 827 default: 828 error = ENOTTY; 829 break; 830 } 831 832 ifnet_deserialize_all(ifp); 833 return (error); 834 } 835 836 837 /* 838 * tapread 839 * 840 * The ops read interface - reads a packet at a time, or at 841 * least as much of a packet as can be read. 842 * 843 * Called from the fileops interface with nothing held. 844 * 845 * MPSAFE 846 */ 847 static int 848 tapread(struct dev_read_args *ap) 849 { 850 cdev_t dev = ap->a_head.a_dev; 851 struct uio *uio = ap->a_uio; 852 struct tap_softc *sc = dev->si_drv1; 853 struct ifnet *ifp = &sc->tap_if; 854 struct mbuf *m0 = NULL; 855 int error = 0, len; 856 857 TAPDEBUG(ifp, "reading, minor = %#x\n", minor(dev)); 858 859 if ((sc->tap_flags & TAP_READY) != TAP_READY) { 860 TAPDEBUG(ifp, "not ready, minor = %#x, flags = 0x%x\n", 861 minor(dev), sc->tap_flags); 862 863 return (EHOSTDOWN); 864 } 865 866 sc->tap_flags &= ~TAP_RWAIT; 867 868 /* sleep until we get a packet */ 869 do { 870 ifnet_serialize_all(ifp); 871 IF_DEQUEUE(&sc->tap_devq, m0); 872 if (m0 == NULL) { 873 if (ap->a_ioflag & IO_NDELAY) { 874 ifnet_deserialize_all(ifp); 875 return (EWOULDBLOCK); 876 } 877 sc->tap_flags |= TAP_RWAIT; 878 tsleep_interlock(sc, PCATCH); 879 ifnet_deserialize_all(ifp); 880 error = tsleep(sc, PCATCH | PINTERLOCKED, "taprd", 0); 881 if (error) 882 return (error); 883 } else { 884 ifnet_deserialize_all(ifp); 885 } 886 } while (m0 == NULL); 887 888 BPF_MTAP(ifp, m0); 889 890 /* xfer packet to user space */ 891 while ((m0 != NULL) && (uio->uio_resid > 0) && (error == 0)) { 892 len = (int)szmin(uio->uio_resid, m0->m_len); 893 if (len == 0) 894 break; 895 896 error = uiomove(mtod(m0, caddr_t), (size_t)len, uio); 897 m0 = m_free(m0); 898 } 899 900 if (m0 != NULL) { 901 TAPDEBUG(ifp, "dropping mbuf, minor = %#x\n", minor(dev)); 902 m_freem(m0); 903 } 904 905 return (error); 906 } 907 908 /* 909 * tapwrite 910 * 911 * The ops write interface - an atomic write is a packet - or else! 912 * 913 * Called from the fileops interface with nothing held. 914 * 915 * MPSAFE 916 */ 917 static int 918 tapwrite(struct dev_write_args *ap) 919 { 920 cdev_t dev = ap->a_head.a_dev; 921 struct uio *uio = ap->a_uio; 922 struct tap_softc *sc = dev->si_drv1; 923 struct ifnet *ifp = &sc->tap_if; 924 struct mbuf *top = NULL, **mp = NULL, *m = NULL; 925 int error; 926 size_t tlen, mlen; 927 928 TAPDEBUG(ifp, "writing, minor = %#x\n", minor(dev)); 929 930 if ((sc->tap_flags & TAP_READY) != TAP_READY) { 931 TAPDEBUG(ifp, "not ready, minor = %#x, flags = 0x%x\n", 932 minor(dev), sc->tap_flags); 933 return (EHOSTDOWN); 934 } 935 936 if (uio->uio_resid == 0) 937 return (0); 938 939 if (uio->uio_resid > TAPMRU) { 940 TAPDEBUG(ifp, "invalid packet len = %zu, minor = %#x\n", 941 uio->uio_resid, minor(dev)); 942 943 return (EIO); 944 } 945 tlen = uio->uio_resid; 946 947 /* get a header mbuf */ 948 MGETHDR(m, M_WAITOK, MT_DATA); 949 if (m == NULL) 950 return (ENOBUFS); 951 mlen = MHLEN; 952 953 top = NULL; 954 mp = ⊤ 955 error = 0; 956 957 while (error == 0 && uio->uio_resid > 0) { 958 m->m_len = (int)szmin(mlen, uio->uio_resid); 959 error = uiomove(mtod(m, caddr_t), (size_t)m->m_len, uio); 960 *mp = m; 961 mp = &m->m_next; 962 if (uio->uio_resid > 0) { 963 MGET(m, M_WAITOK, MT_DATA); 964 if (m == NULL) { 965 error = ENOBUFS; 966 break; 967 } 968 mlen = MLEN; 969 } 970 } 971 if (error) { 972 IFNET_STAT_INC(ifp, ierrors, 1); 973 if (top) 974 m_freem(top); 975 return (error); 976 } 977 978 top->m_pkthdr.len = (int)tlen; 979 top->m_pkthdr.rcvif = ifp; 980 981 /* 982 * Ethernet bridge and bpf are handled in ether_input 983 * 984 * adjust mbuf and give packet to the ether_input 985 */ 986 ifnet_serialize_all(ifp); 987 ifp->if_input(ifp, top, NULL, -1); 988 IFNET_STAT_INC(ifp, ipackets, 1); /* ibytes are counted in ether_input */ 989 ifnet_deserialize_all(ifp); 990 991 return (0); 992 } 993 994 995 /* 996 * tapkqfilter - called from the fileops interface with nothing held 997 * 998 * MPSAFE 999 */ 1000 static int 1001 tapkqfilter(struct dev_kqfilter_args *ap) 1002 { 1003 cdev_t dev = ap->a_head.a_dev; 1004 struct knote *kn = ap->a_kn; 1005 struct tap_softc *sc = dev->si_drv1; 1006 struct klist *list; 1007 1008 list = &sc->tap_rkq.ki_note; 1009 ap->a_result =0; 1010 1011 switch (kn->kn_filter) { 1012 case EVFILT_READ: 1013 kn->kn_fop = &tapread_filtops; 1014 kn->kn_hook = (void *)sc; 1015 break; 1016 case EVFILT_WRITE: 1017 kn->kn_fop = &tapwrite_filtops; 1018 kn->kn_hook = (void *)sc; 1019 break; 1020 default: 1021 ap->a_result = EOPNOTSUPP; 1022 return (0); 1023 } 1024 1025 knote_insert(list, kn); 1026 return (0); 1027 } 1028 1029 static int 1030 tap_filter_read(struct knote *kn, long hint) 1031 { 1032 struct tap_softc *sc = (struct tap_softc *)kn->kn_hook; 1033 1034 if (IF_QEMPTY(&sc->tap_devq) == 0) /* XXX serializer */ 1035 return (1); 1036 else 1037 return (0); 1038 } 1039 1040 static int 1041 tap_filter_write(struct knote *kn, long hint) 1042 { 1043 /* Always ready for a write */ 1044 return (1); 1045 } 1046 1047 static void 1048 tap_filter_detach(struct knote *kn) 1049 { 1050 struct tap_softc *sc = (struct tap_softc *)kn->kn_hook; 1051 1052 knote_remove(&sc->tap_rkq.ki_note, kn); 1053 } 1054