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 * $DragonFly: src/sys/net/tap/if_tap.c,v 1.41 2008/09/05 17:03:15 dillon Exp $ 36 * $Id: if_tap.c,v 0.21 2000/07/23 21:46:02 max Exp $ 37 */ 38 39 #include "opt_inet.h" 40 41 #include <sys/param.h> 42 #include <sys/conf.h> 43 #include <sys/device.h> 44 #include <sys/filedesc.h> 45 #include <sys/filio.h> 46 #include <sys/kernel.h> 47 #include <sys/malloc.h> 48 #include <sys/mbuf.h> 49 #include <sys/poll.h> 50 #include <sys/proc.h> 51 #include <sys/priv.h> 52 #include <sys/signalvar.h> 53 #include <sys/socket.h> 54 #include <sys/sockio.h> 55 #include <sys/sysctl.h> 56 #include <sys/systm.h> 57 #include <sys/thread2.h> 58 #include <sys/ttycom.h> 59 #include <sys/uio.h> 60 #include <sys/vnode.h> 61 #include <sys/serialize.h> 62 63 #include <net/bpf.h> 64 #include <net/ethernet.h> 65 #include <net/if.h> 66 #include <net/ifq_var.h> 67 #include <net/if_arp.h> 68 #include <net/if_clone.h> 69 #include <net/route.h> 70 #include <sys/devfs.h> 71 72 #include <netinet/in.h> 73 74 #include "if_tapvar.h" 75 #include "if_tap.h" 76 77 #define TAP_IFFLAGS (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST) 78 79 #define TAP_PREALLOCATED_UNITS 4 80 81 #define CDEV_NAME "tap" 82 #define CDEV_MAJOR 149 83 #define TAPDEBUG if (tapdebug) if_printf 84 85 #define TAP "tap" 86 #define VMNET "vmnet" 87 #define VMNET_DEV_MASK 0x00010000 88 89 DEVFS_DECLARE_CLONE_BITMAP(tap); 90 91 /* module */ 92 static int tapmodevent (module_t, int, void *); 93 94 /* device */ 95 static struct tap_softc *tapcreate(int, cdev_t); 96 static void tapdestroy(struct tap_softc *); 97 98 /* clone */ 99 static int tap_clone_create(struct if_clone *, int); 100 static void tap_clone_destroy(struct ifnet *); 101 102 103 /* network interface */ 104 static void tapifstart (struct ifnet *); 105 static int tapifioctl (struct ifnet *, u_long, caddr_t, 106 struct ucred *); 107 static void tapifinit (void *); 108 static void tapifstop(struct tap_softc *, int); 109 static void tapifflags(struct tap_softc *); 110 111 /* character device */ 112 static d_open_t tapopen; 113 static d_clone_t tapclone; 114 static d_close_t tapclose; 115 static d_read_t tapread; 116 static d_write_t tapwrite; 117 static d_ioctl_t tapioctl; 118 static d_poll_t tappoll; 119 static d_kqfilter_t tapkqfilter; 120 121 static struct dev_ops tap_ops = { 122 { CDEV_NAME, CDEV_MAJOR, 0 }, 123 .d_open = tapopen, 124 .d_close = tapclose, 125 .d_read = tapread, 126 .d_write = tapwrite, 127 .d_ioctl = tapioctl, 128 .d_poll = tappoll, 129 .d_kqfilter = tapkqfilter 130 }; 131 132 static int taprefcnt = 0; /* module ref. counter */ 133 static int taplastunit = -1; /* max. open unit number */ 134 static int tapdebug = 0; /* debug flag */ 135 static int tapuopen = 0; /* all user open() */ 136 static int tapuponopen = 0; /* IFF_UP */ 137 138 MALLOC_DECLARE(M_TAP); 139 MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface"); 140 struct if_clone tap_cloner = IF_CLONE_INITIALIZER("tap", 141 tap_clone_create, tap_clone_destroy, 142 0, IF_MAXUNIT); 143 static SLIST_HEAD(,tap_softc) tap_listhead = 144 SLIST_HEAD_INITIALIZER(&tap_listhead); 145 146 SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, ""); 147 SYSCTL_DECL(_net_link); 148 SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0, 149 "Ethernet tunnel software network interface"); 150 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0, 151 "Allow user to open /dev/tap (based on node permissions)"); 152 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0, 153 "Bring interface up when /dev/tap is opened"); 154 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, ""); 155 156 DEV_MODULE(if_tap, tapmodevent, NULL); 157 158 /* 159 * tapmodevent 160 * 161 * module event handler 162 */ 163 static int 164 tapmodevent(module_t mod, int type, void *data) 165 { 166 static int attached = 0; 167 struct tap_softc *tp, *ntp; 168 int i; 169 170 switch (type) { 171 case MOD_LOAD: 172 if (attached) 173 return (EEXIST); 174 175 make_autoclone_dev(&tap_ops, &DEVFS_CLONE_BITMAP(tap), tapclone, 176 UID_ROOT, GID_WHEEL, 0600, "tap"); 177 SLIST_INIT(&tap_listhead); 178 if_clone_attach(&tap_cloner); 179 180 for (i = 0; i < TAP_PREALLOCATED_UNITS; ++i) { 181 make_dev(&tap_ops, i, UID_ROOT, GID_WHEEL, 182 0600, "tap%d", i); 183 devfs_clone_bitmap_set(&DEVFS_CLONE_BITMAP(tap), i); 184 } 185 186 attached = 1; 187 break; 188 189 case MOD_UNLOAD: 190 if (taprefcnt > 0) 191 return (EBUSY); 192 193 if_clone_detach(&tap_cloner); 194 195 /* Maintain tap ifs in a local list */ 196 SLIST_FOREACH_MUTABLE(tp, &tap_listhead, tap_link, ntp) 197 tapdestroy(tp); 198 199 attached = 0; 200 201 devfs_clone_handler_del("tap"); 202 dev_ops_remove_all(&tap_ops); 203 devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(tap)); 204 break; 205 206 default: 207 return (EOPNOTSUPP); 208 } 209 210 return (0); 211 } /* tapmodevent */ 212 213 214 /* 215 * tapcreate - create or clone an interface 216 */ 217 static struct tap_softc * 218 tapcreate(int unit, cdev_t dev) 219 { 220 const char *name = TAP; 221 struct ifnet *ifp; 222 struct tap_softc *tp; 223 uint8_t ether_addr[ETHER_ADDR_LEN]; 224 225 tp = kmalloc(sizeof(*tp), M_TAP, M_WAITOK | M_ZERO); 226 dev->si_drv1 = tp; 227 tp->tap_dev = dev; 228 tp->tap_unit = unit; 229 230 reference_dev(dev); /* tp association */ 231 232 /* generate fake MAC address: 00 bd xx xx xx unit_no */ 233 ether_addr[0] = 0x00; 234 ether_addr[1] = 0xbd; 235 bcopy(&ticks, ðer_addr[2], 3); 236 ether_addr[5] = (u_char)unit; 237 238 /* fill the rest and attach interface */ 239 ifp = &tp->tap_if; 240 ifp->if_softc = tp; 241 242 if_initname(ifp, name, unit); 243 if (unit > taplastunit) 244 taplastunit = unit; 245 246 ifp->if_init = tapifinit; 247 ifp->if_start = tapifstart; 248 ifp->if_ioctl = tapifioctl; 249 ifp->if_mtu = ETHERMTU; 250 ifp->if_flags = TAP_IFFLAGS; 251 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen); 252 ifq_set_ready(&ifp->if_snd); 253 254 ether_ifattach(ifp, ether_addr, NULL); 255 256 tp->tap_flags |= TAP_INITED; 257 tp->tap_devq.ifq_maxlen = ifqmaxlen; 258 259 SLIST_INSERT_HEAD(&tap_listhead, tp, tap_link); 260 261 TAPDEBUG(ifp, "created. minor = %#x\n", minor(dev)); 262 return (tp); 263 } 264 265 static 266 struct tap_softc * 267 tapfind(int unit) 268 { 269 struct tap_softc *tp; 270 271 SLIST_FOREACH(tp, &tap_listhead, tap_link) { 272 if (tp->tap_unit == unit) 273 return(tp); 274 } 275 return (NULL); 276 } 277 278 /* 279 * tap_clone_create: 280 * 281 * Create a new tap instance via ifconfig. 282 */ 283 static int 284 tap_clone_create(struct if_clone *ifc __unused, int unit) 285 { 286 struct tap_softc *tp; 287 cdev_t dev; 288 289 tp = tapfind(unit); 290 if (tp == NULL) { 291 if (!devfs_clone_bitmap_chk(&DEVFS_CLONE_BITMAP(tap), unit)) { 292 devfs_clone_bitmap_set(&DEVFS_CLONE_BITMAP(tap), unit); 293 dev = make_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL, 294 0600, "%s%d", TAP, unit); 295 } else { 296 dev = devfs_find_device_by_name("%s%d", TAP, unit); 297 } 298 299 KKASSERT(dev != NULL); 300 tp = tapcreate(unit, dev); 301 } 302 tp->tap_flags |= TAP_CLONE; 303 TAPDEBUG(&tp->tap_if, "clone created. minor = %#x tap_flags = 0x%x\n", 304 minor(tp->tap_dev), tp->tap_flags); 305 306 return (0); 307 } 308 309 /* 310 * tapopen 311 * 312 * to open tunnel. must be superuser 313 */ 314 static int 315 tapopen(struct dev_open_args *ap) 316 { 317 cdev_t dev = NULL; 318 struct tap_softc *tp = NULL; 319 struct ifnet *ifp = NULL; 320 int error; 321 322 if (tapuopen == 0 && 323 (error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) != 0) 324 return (error); 325 326 get_mplock(); 327 dev = ap->a_head.a_dev; 328 tp = dev->si_drv1; 329 if (tp == NULL) 330 tp = tapcreate(minor(dev), dev); 331 if (tp->tap_flags & TAP_OPEN) { 332 rel_mplock(); 333 return (EBUSY); 334 } 335 ifp = &tp->arpcom.ac_if; 336 337 if ((tp->tap_flags & TAP_CLONE) == 0) { 338 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp); 339 340 /* Announce the return of the interface. */ 341 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 342 } 343 344 bcopy(tp->arpcom.ac_enaddr, tp->ether_addr, sizeof(tp->ether_addr)); 345 346 if (curthread->td_proc) 347 fsetown(curthread->td_proc->p_pid, &tp->tap_sigtd); 348 tp->tap_flags |= TAP_OPEN; 349 taprefcnt ++; 350 351 if (tapuponopen && (ifp->if_flags & IFF_UP) == 0) { 352 crit_enter(); 353 if_up(ifp); 354 crit_exit(); 355 356 ifnet_serialize_all(ifp); 357 tapifflags(tp); 358 ifnet_deserialize_all(ifp); 359 360 tp->tap_flags |= TAP_CLOSEDOWN; 361 } 362 363 TAPDEBUG(ifp, "opened. minor = %#x, refcnt = %d, taplastunit = %d\n", 364 minor(tp->tap_dev), taprefcnt, taplastunit); 365 366 rel_mplock(); 367 return (0); 368 } 369 370 static int 371 tapclone(struct dev_clone_args *ap) 372 { 373 int unit; 374 375 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(tap), 0); 376 ap->a_dev = make_only_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL, 377 0600, "%s%d", TAP, unit); 378 tapcreate(unit, ap->a_dev); 379 return (0); 380 } 381 382 /* 383 * tapclose 384 * 385 * close the device - mark i/f down & delete routing info 386 */ 387 static int 388 tapclose(struct dev_close_args *ap) 389 { 390 cdev_t dev = ap->a_head.a_dev; 391 struct tap_softc *tp = dev->si_drv1; 392 struct ifnet *ifp = &tp->tap_if; 393 int clear_flags = 0; 394 395 get_mplock(); 396 397 /* Junk all pending output */ 398 ifq_purge(&ifp->if_snd); 399 400 /* 401 * Do not bring the interface down, and do not anything with 402 * interface, if we are in VMnet mode. just close the device. 403 * 404 * If the interface is not cloned, we always bring it down. 405 * 406 * If the interface is cloned, then we bring it down during 407 * closing only if it was brought up during opening. 408 */ 409 if ((tp->tap_flags & TAP_VMNET) == 0 && 410 ((tp->tap_flags & TAP_CLONE) == 0 || 411 (tp->tap_flags & TAP_CLOSEDOWN))) { 412 if (ifp->if_flags & IFF_UP) 413 if_down(ifp); 414 clear_flags = 1; 415 } 416 ifnet_serialize_all(ifp); 417 tapifstop(tp, clear_flags); 418 ifnet_deserialize_all(ifp); 419 420 if ((tp->tap_flags & TAP_CLONE) == 0) { 421 if_purgeaddrs_nolink(ifp); 422 423 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp); 424 425 /* Announce the departure of the interface. */ 426 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 427 } 428 429 funsetown(tp->tap_sigio); 430 tp->tap_sigio = NULL; 431 selwakeup(&tp->tap_rsel); 432 433 tp->tap_flags &= ~TAP_OPEN; 434 funsetown(tp->tap_sigtd); 435 tp->tap_sigtd = NULL; 436 437 taprefcnt --; 438 if (taprefcnt < 0) { 439 taprefcnt = 0; 440 if_printf(ifp, "minor = %#x, refcnt = %d is out of sync. " 441 "set refcnt to 0\n", minor(tp->tap_dev), taprefcnt); 442 } 443 444 TAPDEBUG(ifp, "closed. minor = %#x, refcnt = %d, taplastunit = %d\n", 445 minor(tp->tap_dev), taprefcnt, taplastunit); 446 447 if (tp->tap_unit >= TAP_PREALLOCATED_UNITS) 448 tapdestroy(tp); 449 450 rel_mplock(); 451 return (0); 452 } 453 454 /* 455 * tapdestroy: 456 * 457 * Destroy a tap instance. 458 */ 459 static void 460 tapdestroy(struct tap_softc *tp) 461 { 462 struct ifnet *ifp = &tp->arpcom.ac_if; 463 cdev_t dev; 464 465 TAPDEBUG(ifp, "destroyed. minor = %#x, refcnt = %d, taplastunit = %d\n", 466 minor(tp->tap_dev), taprefcnt, taplastunit); 467 468 ifnet_serialize_all(ifp); 469 tapifstop(tp, 1); 470 ifnet_deserialize_all(ifp); 471 472 ether_ifdetach(ifp); 473 SLIST_REMOVE(&tap_listhead, tp, tap_softc, tap_link); 474 475 dev = tp->tap_dev; 476 tp->tap_dev = NULL; 477 dev->si_drv1 = NULL; 478 479 release_dev(dev); /* tp association */ 480 481 /* 482 * Also destroy the cloned device 483 */ 484 if (tp->tap_unit >= TAP_PREALLOCATED_UNITS) { 485 destroy_dev(dev); 486 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(tap), tp->tap_unit); 487 } 488 489 kfree(tp, M_TAP); 490 491 taplastunit--; 492 } 493 494 /* 495 * tap_clone_destroy: 496 * 497 * Destroy a tap instance. 498 */ 499 static void 500 tap_clone_destroy(struct ifnet *ifp) 501 { 502 struct tap_softc *tp = ifp->if_softc; 503 504 TAPDEBUG(&tp->tap_if, "clone destroyed. minor = %#x tap_flags = 0x%x\n", 505 minor(tp->tap_dev), tp->tap_flags); 506 if (tp->tap_flags & TAP_CLONE) 507 tapdestroy(tp); 508 } 509 510 /* 511 * tapifinit 512 * 513 * Network interface initialization function (called with if serializer held) 514 * 515 * MPSAFE 516 */ 517 static void 518 tapifinit(void *xtp) 519 { 520 struct tap_softc *tp = xtp; 521 struct ifnet *ifp = &tp->tap_if; 522 523 TAPDEBUG(ifp, "initializing, minor = %#x tap_flags = 0x%x\n", 524 minor(tp->tap_dev), tp->tap_flags); 525 526 ASSERT_IFNET_SERIALIZED_ALL(ifp); 527 528 tapifstop(tp, 1); 529 530 ifp->if_flags |= IFF_RUNNING; 531 ifp->if_flags &= ~IFF_OACTIVE; 532 533 /* attempt to start output */ 534 tapifstart(ifp); 535 } 536 537 538 /* 539 * tapifioctl 540 * 541 * Process an ioctl request on network interface (called with if serializer 542 * held). 543 * 544 * MPSAFE 545 */ 546 static int 547 tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 548 { 549 struct tap_softc *tp = (struct tap_softc *)(ifp->if_softc); 550 struct ifstat *ifs = NULL; 551 int dummy; 552 553 switch (cmd) { 554 case SIOCSIFADDR: 555 case SIOCGIFADDR: 556 case SIOCSIFMTU: 557 dummy = ether_ioctl(ifp, cmd, data); 558 return (dummy); 559 560 case SIOCSIFFLAGS: 561 tapifflags(tp); 562 break; 563 564 case SIOCADDMULTI: /* XXX -- just like vmnet does */ 565 case SIOCDELMULTI: 566 break; 567 568 case SIOCGIFSTATUS: 569 ifs = (struct ifstat *)data; 570 dummy = strlen(ifs->ascii); 571 if ((tp->tap_flags & TAP_OPEN) && 572 dummy < sizeof(ifs->ascii)) { 573 if (tp->tap_sigtd && tp->tap_sigtd->sio_proc) { 574 ksnprintf(ifs->ascii + dummy, 575 sizeof(ifs->ascii) - dummy, 576 "\tOpened by pid %d\n", 577 (int)tp->tap_sigtd->sio_proc->p_pid); 578 } else { 579 ksnprintf(ifs->ascii + dummy, 580 sizeof(ifs->ascii) - dummy, 581 "\tOpened by <unknown>\n"); 582 } 583 } 584 break; 585 586 default: 587 return (EINVAL); 588 } 589 590 return (0); 591 } 592 593 594 /* 595 * tapifstart 596 * 597 * Queue packets from higher level ready to put out (called with if serializer 598 * held) 599 * 600 * MPSAFE 601 */ 602 static void 603 tapifstart(struct ifnet *ifp) 604 { 605 struct tap_softc *tp = ifp->if_softc; 606 struct ifqueue *ifq; 607 struct mbuf *m; 608 int has_data = 0; 609 610 TAPDEBUG(ifp, "starting, minor = %#x\n", minor(tp->tap_dev)); 611 612 /* 613 * do not junk pending output if we are in VMnet mode. 614 * XXX: can this do any harm because of queue overflow? 615 */ 616 617 if (((tp->tap_flags & TAP_VMNET) == 0) && 618 ((tp->tap_flags & TAP_READY) != TAP_READY)) { 619 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n", 620 minor(tp->tap_dev), tp->tap_flags); 621 ifq_purge(&ifp->if_snd); 622 return; 623 } 624 625 ifp->if_flags |= IFF_OACTIVE; 626 627 ifq = &tp->tap_devq; 628 while ((m = ifq_dequeue(&ifp->if_snd, NULL)) != NULL) { 629 if (IF_QFULL(ifq)) { 630 IF_DROP(ifq); 631 ifp->if_oerrors++; 632 m_freem(m); 633 } else { 634 IF_ENQUEUE(ifq, m); 635 ifp->if_opackets++; 636 has_data = 1; 637 } 638 } 639 640 if (has_data) { 641 if (tp->tap_flags & TAP_RWAIT) { 642 tp->tap_flags &= ~TAP_RWAIT; 643 wakeup((caddr_t)tp); 644 } 645 646 get_mplock(); 647 KNOTE(&tp->tap_rsel.si_note, 0); 648 rel_mplock(); 649 650 if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) { 651 get_mplock(); 652 pgsigio(tp->tap_sigio, SIGIO, 0); 653 rel_mplock(); 654 } 655 656 /* 657 * selwakeup is not MPSAFE. tapifstart is. 658 */ 659 get_mplock(); 660 selwakeup(&tp->tap_rsel); 661 rel_mplock(); 662 } 663 664 ifp->if_flags &= ~IFF_OACTIVE; 665 } 666 667 668 /* 669 * tapioctl 670 * 671 * The ops interface is now pretty minimal. Called via fileops with nothing 672 * held. 673 * 674 * MPSAFE 675 */ 676 static int 677 tapioctl(struct dev_ioctl_args *ap) 678 { 679 cdev_t dev = ap->a_head.a_dev; 680 caddr_t data = ap->a_data; 681 struct tap_softc *tp = dev->si_drv1; 682 struct ifnet *ifp = &tp->tap_if; 683 struct tapinfo *tapp = NULL; 684 struct mbuf *mb; 685 short f; 686 int error; 687 688 ifnet_serialize_all(ifp); 689 error = 0; 690 691 switch (ap->a_cmd) { 692 case TAPSIFINFO: 693 tapp = (struct tapinfo *)data; 694 ifp->if_mtu = tapp->mtu; 695 ifp->if_type = tapp->type; 696 ifp->if_baudrate = tapp->baudrate; 697 break; 698 699 case TAPGIFINFO: 700 tapp = (struct tapinfo *)data; 701 tapp->mtu = ifp->if_mtu; 702 tapp->type = ifp->if_type; 703 tapp->baudrate = ifp->if_baudrate; 704 break; 705 706 case TAPSDEBUG: 707 tapdebug = *(int *)data; 708 break; 709 710 case TAPGDEBUG: 711 *(int *)data = tapdebug; 712 break; 713 714 case FIOASYNC: 715 if (*(int *)data) 716 tp->tap_flags |= TAP_ASYNC; 717 else 718 tp->tap_flags &= ~TAP_ASYNC; 719 break; 720 721 case FIONREAD: 722 *(int *)data = 0; 723 724 /* Take a look at devq first */ 725 IF_POLL(&tp->tap_devq, mb); 726 if (mb == NULL) 727 mb = ifq_poll(&ifp->if_snd); 728 729 if (mb != NULL) { 730 for(; mb != NULL; mb = mb->m_next) 731 *(int *)data += mb->m_len; 732 } 733 break; 734 735 case FIOSETOWN: 736 error = fsetown(*(int *)data, &tp->tap_sigio); 737 break; 738 739 case FIOGETOWN: 740 *(int *)data = fgetown(tp->tap_sigio); 741 break; 742 743 /* this is deprecated, FIOSETOWN should be used instead */ 744 case TIOCSPGRP: 745 error = fsetown(-(*(int *)data), &tp->tap_sigio); 746 break; 747 748 /* this is deprecated, FIOGETOWN should be used instead */ 749 case TIOCGPGRP: 750 *(int *)data = -fgetown(tp->tap_sigio); 751 break; 752 753 /* VMware/VMnet port ioctl's */ 754 755 case SIOCGIFFLAGS: /* get ifnet flags */ 756 bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags)); 757 break; 758 759 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 760 f = *(short *)data; 761 f &= 0x0fff; 762 f &= ~IFF_CANTCHANGE; 763 f |= IFF_UP; 764 ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE); 765 break; 766 767 case OSIOCGIFADDR: /* get MAC address of the remote side */ 768 case SIOCGIFADDR: 769 bcopy(tp->ether_addr, data, sizeof(tp->ether_addr)); 770 break; 771 772 case SIOCSIFADDR: /* set MAC address of the remote side */ 773 bcopy(data, tp->ether_addr, sizeof(tp->ether_addr)); 774 break; 775 776 default: 777 error = ENOTTY; 778 break; 779 } 780 ifnet_deserialize_all(ifp); 781 return (error); 782 } 783 784 785 /* 786 * tapread 787 * 788 * The ops read interface - reads a packet at a time, or at 789 * least as much of a packet as can be read. 790 * 791 * Called from the fileops interface with nothing held. 792 * 793 * MPSAFE 794 */ 795 static int 796 tapread(struct dev_read_args *ap) 797 { 798 cdev_t dev = ap->a_head.a_dev; 799 struct uio *uio = ap->a_uio; 800 struct tap_softc *tp = dev->si_drv1; 801 struct ifnet *ifp = &tp->tap_if; 802 struct mbuf *m0 = NULL; 803 int error = 0, len; 804 805 TAPDEBUG(ifp, "reading, minor = %#x\n", minor(tp->tap_dev)); 806 807 if ((tp->tap_flags & TAP_READY) != TAP_READY) { 808 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n", 809 minor(tp->tap_dev), tp->tap_flags); 810 811 return (EHOSTDOWN); 812 } 813 814 tp->tap_flags &= ~TAP_RWAIT; 815 816 /* sleep until we get a packet */ 817 do { 818 ifnet_serialize_all(ifp); 819 IF_DEQUEUE(&tp->tap_devq, m0); 820 if (m0 == NULL) { 821 if (ap->a_ioflag & IO_NDELAY) { 822 ifnet_deserialize_all(ifp); 823 return (EWOULDBLOCK); 824 } 825 tp->tap_flags |= TAP_RWAIT; 826 tsleep_interlock(tp, PCATCH); 827 ifnet_deserialize_all(ifp); 828 error = tsleep(tp, PCATCH | PINTERLOCKED, "taprd", 0); 829 if (error) 830 return (error); 831 } else { 832 ifnet_deserialize_all(ifp); 833 } 834 } while (m0 == NULL); 835 836 BPF_MTAP(ifp, m0); 837 838 /* xfer packet to user space */ 839 while ((m0 != NULL) && (uio->uio_resid > 0) && (error == 0)) { 840 len = (int)szmin(uio->uio_resid, m0->m_len); 841 if (len == 0) 842 break; 843 844 error = uiomove(mtod(m0, caddr_t), (size_t)len, uio); 845 m0 = m_free(m0); 846 } 847 848 if (m0 != NULL) { 849 TAPDEBUG(ifp, "dropping mbuf, minor = %#x\n", 850 minor(tp->tap_dev)); 851 m_freem(m0); 852 } 853 854 return (error); 855 } 856 857 /* 858 * tapwrite 859 * 860 * The ops write interface - an atomic write is a packet - or else! 861 * 862 * Called from the fileops interface with nothing held. 863 * 864 * MPSAFE 865 */ 866 static int 867 tapwrite(struct dev_write_args *ap) 868 { 869 cdev_t dev = ap->a_head.a_dev; 870 struct uio *uio = ap->a_uio; 871 struct tap_softc *tp = dev->si_drv1; 872 struct ifnet *ifp = &tp->tap_if; 873 struct mbuf *top = NULL, **mp = NULL, *m = NULL; 874 int error = 0; 875 size_t tlen, mlen; 876 877 TAPDEBUG(ifp, "writing, minor = %#x\n", minor(tp->tap_dev)); 878 879 if ((tp->tap_flags & TAP_READY) != TAP_READY) { 880 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n", 881 minor(tp->tap_dev), tp->tap_flags); 882 return (EHOSTDOWN); 883 } 884 885 if (uio->uio_resid == 0) 886 return (0); 887 888 if (uio->uio_resid > TAPMRU) { 889 TAPDEBUG(ifp, "invalid packet len = %zu, minor = %#x\n", 890 uio->uio_resid, minor(tp->tap_dev)); 891 892 return (EIO); 893 } 894 tlen = uio->uio_resid; 895 896 /* get a header mbuf */ 897 MGETHDR(m, MB_DONTWAIT, MT_DATA); 898 if (m == NULL) 899 return (ENOBUFS); 900 mlen = MHLEN; 901 902 top = 0; 903 mp = ⊤ 904 while ((error == 0) && (uio->uio_resid > 0)) { 905 m->m_len = (int)szmin(mlen, uio->uio_resid); 906 error = uiomove(mtod(m, caddr_t), (size_t)m->m_len, uio); 907 *mp = m; 908 mp = &m->m_next; 909 if (uio->uio_resid > 0) { 910 MGET(m, MB_DONTWAIT, MT_DATA); 911 if (m == NULL) { 912 error = ENOBUFS; 913 break; 914 } 915 mlen = MLEN; 916 } 917 } 918 if (error) { 919 ifp->if_ierrors ++; 920 if (top) 921 m_freem(top); 922 return (error); 923 } 924 925 top->m_pkthdr.len = (int)tlen; 926 top->m_pkthdr.rcvif = ifp; 927 928 /* 929 * Ethernet bridge and bpf are handled in ether_input 930 * 931 * adjust mbuf and give packet to the ether_input 932 */ 933 ifnet_serialize_all(ifp); 934 ifp->if_input(ifp, top); 935 ifp->if_ipackets ++; /* ibytes are counted in ether_input */ 936 ifnet_deserialize_all(ifp); 937 938 return (0); 939 } 940 941 /* 942 * tappoll 943 * 944 * The poll interface, this is only useful on reads really. The write 945 * detect always returns true, write never blocks anyway, it either 946 * accepts the packet or drops it 947 * 948 * Called from the fileops interface with nothing held. 949 * 950 * MPSAFE 951 */ 952 static int 953 tappoll(struct dev_poll_args *ap) 954 { 955 cdev_t dev = ap->a_head.a_dev; 956 struct tap_softc *tp = dev->si_drv1; 957 struct ifnet *ifp = &tp->tap_if; 958 int revents = 0; 959 960 TAPDEBUG(ifp, "polling, minor = %#x\n", minor(tp->tap_dev)); 961 962 if (ap->a_events & (POLLIN | POLLRDNORM)) { 963 if (!IF_QEMPTY(&tp->tap_devq)) { 964 TAPDEBUG(ifp, 965 "has data in queue. minor = %#x\n", 966 minor(tp->tap_dev)); 967 968 revents |= (ap->a_events & (POLLIN | POLLRDNORM)); 969 } else { 970 TAPDEBUG(ifp, "waiting for data, minor = %#x\n", 971 minor(tp->tap_dev)); 972 973 get_mplock(); 974 selrecord(curthread, &tp->tap_rsel); 975 rel_mplock(); 976 } 977 } 978 979 if (ap->a_events & (POLLOUT | POLLWRNORM)) 980 revents |= (ap->a_events & (POLLOUT | POLLWRNORM)); 981 ap->a_events = revents; 982 return (0); 983 } 984 985 /* 986 * tapkqfilter - called from the fileops interface with nothing held 987 * 988 * MPSAFE 989 */ 990 static int filt_tapread(struct knote *kn, long hint); 991 static void filt_tapdetach(struct knote *kn); 992 static struct filterops tapread_filtops = 993 { 1, NULL, filt_tapdetach, filt_tapread }; 994 995 static int 996 tapkqfilter(struct dev_kqfilter_args *ap) 997 { 998 cdev_t dev = ap->a_head.a_dev; 999 struct knote *kn = ap->a_kn; 1000 struct tap_softc *tp; 1001 struct klist *list; 1002 struct ifnet *ifp; 1003 1004 get_mplock(); 1005 tp = dev->si_drv1; 1006 ifp = &tp->tap_if; 1007 ap->a_result =0; 1008 1009 switch(kn->kn_filter) { 1010 case EVFILT_READ: 1011 list = &tp->tap_rsel.si_note; 1012 kn->kn_fop = &tapread_filtops; 1013 kn->kn_hook = (void *)tp; 1014 break; 1015 case EVFILT_WRITE: 1016 /* fall through */ 1017 default: 1018 ap->a_result = 1; 1019 rel_mplock(); 1020 return(0); 1021 } 1022 crit_enter(); 1023 SLIST_INSERT_HEAD(list, kn, kn_selnext); 1024 crit_exit(); 1025 rel_mplock(); 1026 return(0); 1027 } 1028 1029 static int 1030 filt_tapread(struct knote *kn, long hint) 1031 { 1032 struct tap_softc *tp = (void *)kn->kn_hook; 1033 1034 if (IF_QEMPTY(&tp->tap_devq) == 0) /* XXX serializer */ 1035 return(1); 1036 else 1037 return(0); 1038 } 1039 1040 static void 1041 filt_tapdetach(struct knote *kn) 1042 { 1043 struct tap_softc *tp = (void *)kn->kn_hook; 1044 1045 SLIST_REMOVE(&tp->tap_rsel.si_note, kn, knote, kn_selnext); 1046 } 1047 1048 static void 1049 tapifstop(struct tap_softc *tp, int clear_flags) 1050 { 1051 struct ifnet *ifp = &tp->tap_if; 1052 1053 ASSERT_IFNET_SERIALIZED_ALL(ifp); 1054 IF_DRAIN(&tp->tap_devq); 1055 tp->tap_flags &= ~TAP_CLOSEDOWN; 1056 if (clear_flags) 1057 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); 1058 } 1059 1060 static void 1061 tapifflags(struct tap_softc *tp) 1062 { 1063 struct ifnet *ifp = &tp->arpcom.ac_if; 1064 1065 ASSERT_IFNET_SERIALIZED_ALL(ifp); 1066 if ((tp->tap_flags & TAP_VMNET) == 0) { 1067 /* 1068 * Only for non-vmnet tap(4) 1069 */ 1070 if (ifp->if_flags & IFF_UP) { 1071 if ((ifp->if_flags & IFF_RUNNING) == 0) 1072 tapifinit(tp); 1073 } else { 1074 tapifstop(tp, 1); 1075 } 1076 } else { 1077 /* XXX */ 1078 } 1079 } 1080