Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net/if_tap.c
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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: releng/5.1/sys/net/if_tap.c 111815 2003-03-03 12:15:54Z phk $ 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/filedesc.h> 43 #include <sys/filio.h> 44 #include <sys/kernel.h> 45 #include <sys/malloc.h> 46 #include <sys/mbuf.h> 47 #include <sys/poll.h> 48 #include <sys/proc.h> 49 #include <sys/signalvar.h> 50 #include <sys/socket.h> 51 #include <sys/sockio.h> 52 #include <sys/sysctl.h> 53 #include <sys/systm.h> 54 #include <sys/ttycom.h> 55 #include <sys/uio.h> 56 #include <sys/vnode.h> 57 #include <machine/bus.h> /* XXX: Shouldn't really be required! */ 58 #include <sys/rman.h> 59 #include <sys/queue.h> 60 61 #include <net/bpf.h> 62 #include <net/ethernet.h> 63 #include <net/if.h> 64 #include <net/if_arp.h> 65 #include <net/route.h> 66 67 #include <netinet/in.h> 68 69 #include <net/if_tapvar.h> 70 #include <net/if_tap.h> 71 72 73 #define CDEV_NAME "tap" 74 #define CDEV_MAJOR 149 75 #define TAPDEBUG if (tapdebug) printf 76 77 #define TAP "tap" 78 #define VMNET "vmnet" 79 #define TAPMAXUNIT 0x7fff 80 #define VMNET_DEV_MASK 0x00800000 81 /* 0x007f00ff */ 82 83 /* module */ 84 static int tapmodevent(module_t, int, void *); 85 86 /* device */ 87 static void tapclone(void *, char *, int, dev_t *); 88 static void tapcreate(dev_t); 89 90 /* network interface */ 91 static void tapifstart(struct ifnet *); 92 static int tapifioctl(struct ifnet *, u_long, caddr_t); 93 static void tapifinit(void *); 94 95 /* character device */ 96 static d_open_t tapopen; 97 static d_close_t tapclose; 98 static d_read_t tapread; 99 static d_write_t tapwrite; 100 static d_ioctl_t tapioctl; 101 static d_poll_t tappoll; 102 103 static struct cdevsw tap_cdevsw = { 104 .d_open = tapopen, 105 .d_close = tapclose, 106 .d_read = tapread, 107 .d_write = tapwrite, 108 .d_ioctl = tapioctl, 109 .d_poll = tappoll, 110 .d_name = CDEV_NAME, 111 .d_maj = CDEV_MAJOR, 112 }; 113 114 static int tapdebug = 0; /* debug flag */ 115 static SLIST_HEAD(, tap_softc) taphead; /* first device */ 116 static udev_t tapbasedev = NOUDEV; /* base device */ 117 static struct rman tapdevunits[2]; /* device units */ 118 #define tapunits tapdevunits 119 #define vmnetunits (tapdevunits + 1) 120 121 MALLOC_DECLARE(M_TAP); 122 MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface"); 123 SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, ""); 124 DEV_MODULE(if_tap, tapmodevent, NULL); 125 126 /* 127 * tapmodevent 128 * 129 * module event handler 130 */ 131 static int 132 tapmodevent(mod, type, data) 133 module_t mod; 134 int type; 135 void *data; 136 { 137 static eventhandler_tag eh_tag = NULL; 138 struct tap_softc *tp = NULL; 139 struct ifnet *ifp = NULL; 140 int error, s; 141 142 switch (type) { 143 case MOD_LOAD: 144 /* initialize resources */ 145 tapunits->rm_type = RMAN_ARRAY; 146 tapunits->rm_descr = "open tap units"; 147 vmnetunits->rm_type = RMAN_ARRAY; 148 vmnetunits->rm_descr = "open vmnet units"; 149 150 error = rman_init(tapunits); 151 if (error != 0) 152 goto bail; 153 154 error = rman_init(vmnetunits); 155 if (error != 0) 156 goto bail1; 157 158 error = rman_manage_region(tapunits, 0, TAPMAXUNIT); 159 if (error != 0) 160 goto bail2; 161 162 error = rman_manage_region(vmnetunits, 0, TAPMAXUNIT); 163 if (error != 0) 164 goto bail2; 165 166 /* intitialize device */ 167 168 SLIST_INIT(&taphead); 169 170 eh_tag = EVENTHANDLER_REGISTER(dev_clone, tapclone, 0, 1000); 171 if (eh_tag == NULL) { 172 error = ENOMEM; 173 goto bail2; 174 } 175 176 177 return (0); 178 bail2: 179 rman_fini(vmnetunits); 180 bail1: 181 rman_fini(tapunits); 182 bail: 183 return (error); 184 185 case MOD_UNLOAD: 186 SLIST_FOREACH(tp, &taphead, tap_next) 187 if (tp->tap_unit != NULL) 188 return (EBUSY); 189 190 EVENTHANDLER_DEREGISTER(dev_clone, eh_tag); 191 192 error = rman_fini(tapunits); 193 KASSERT((error == 0), ("Could not fini tap units")); 194 error = rman_fini(vmnetunits); 195 KASSERT((error == 0), ("Could not fini vmnet units")); 196 197 while ((tp = SLIST_FIRST(&taphead)) != NULL) { 198 SLIST_REMOVE_HEAD(&taphead, tap_next); 199 200 ifp = &tp->tap_if; 201 202 TAPDEBUG("detaching %s%d\n", ifp->if_name,ifp->if_unit); 203 204 KASSERT(!(tp->tap_flags & TAP_OPEN), 205 ("%s%d flags is out of sync", ifp->if_name, 206 ifp->if_unit)); 207 208 /* XXX makedev check? nah.. not right now :) */ 209 210 s = splimp(); 211 ether_ifdetach(ifp); 212 splx(s); 213 214 free(tp, M_TAP); 215 } 216 217 if (tapbasedev != NOUDEV) 218 destroy_dev(udev2dev(tapbasedev, 0)); 219 220 221 break; 222 223 default: 224 return (EOPNOTSUPP); 225 } 226 227 return (0); 228 } /* tapmodevent */ 229 230 231 /* 232 * DEVFS handler 233 * 234 * We need to support two kind of devices - tap and vmnet 235 */ 236 static void 237 tapclone(arg, name, namelen, dev) 238 void *arg; 239 char *name; 240 int namelen; 241 dev_t *dev; 242 { 243 int unit, minor = 0 /* XXX avoid warning */ , error; 244 char *device_name = name; 245 struct resource *r = NULL; 246 247 if (*dev != NODEV) 248 return; 249 250 if (strcmp(device_name, TAP) == 0) { 251 /* get first free tap unit */ 252 r = rman_reserve_resource(tapunits, 0, TAPMAXUNIT, 1, 253 RF_ALLOCATED | RF_ACTIVE, NULL); 254 unit = rman_get_start(r); 255 minor = unit2minor(unit); 256 } 257 else if (strcmp(device_name, VMNET) == 0) { 258 /* get first free vmnet unit */ 259 r = rman_reserve_resource(vmnetunits, 0, TAPMAXUNIT, 1, 260 RF_ALLOCATED | RF_ACTIVE, NULL); 261 unit = rman_get_start(r); 262 minor = unit2minor(unit) | VMNET_DEV_MASK; 263 } 264 265 if (r != NULL) { /* need cloning */ 266 TAPDEBUG("%s%d is available. minor = %#x\n", 267 device_name, unit, minor); 268 269 error = rman_release_resource(r); 270 KASSERT((error == 0), ("Could not release tap/vmnet unit")); 271 272 /* check if device for the unit has been created */ 273 *dev = makedev(CDEV_MAJOR, minor); 274 if ((*dev)->si_flags & SI_NAMED) { 275 TAPDEBUG("%s%d device exists. minor = %#x\n", 276 device_name, unit, minor); 277 return; /* device has been created */ 278 } 279 } else { /* try to match name/unit, first try tap then vmnet */ 280 device_name = TAP; 281 if (dev_stdclone(name, NULL, device_name, &unit) != 1) { 282 device_name = VMNET; 283 284 if (dev_stdclone(name, NULL, device_name, &unit) != 1) 285 return; 286 287 minor = unit2minor(unit) | VMNET_DEV_MASK; 288 } else 289 minor = unit2minor(unit); 290 } 291 292 TAPDEBUG("make_dev(%s%d). minor = %#x\n", device_name, unit, minor); 293 294 *dev = make_dev(&tap_cdevsw, minor, UID_ROOT, GID_WHEEL, 0600, "%s%d", 295 device_name, unit); 296 297 if (tapbasedev == NOUDEV) 298 tapbasedev = (*dev)->si_udev; 299 else { 300 (*dev)->si_flags |= SI_CHEAPCLONE; 301 dev_depends(udev2dev(tapbasedev, 0), *dev); 302 } 303 } /* tapclone */ 304 305 306 /* 307 * tapcreate 308 * 309 * to create interface 310 */ 311 static void 312 tapcreate(dev) 313 dev_t dev; 314 { 315 struct ifnet *ifp = NULL; 316 struct tap_softc *tp = NULL; 317 unsigned short macaddr_hi; 318 int unit, s; 319 char *name = NULL; 320 321 /* allocate driver storage and create device */ 322 MALLOC(tp, struct tap_softc *, sizeof(*tp), M_TAP, M_WAITOK | M_ZERO); 323 SLIST_INSERT_HEAD(&taphead, tp, tap_next); 324 325 unit = dev2unit(dev) & TAPMAXUNIT; 326 327 /* select device: tap or vmnet */ 328 if (minor(dev) & VMNET_DEV_MASK) { 329 name = VMNET; 330 tp->tap_flags |= TAP_VMNET; 331 } else 332 name = TAP; 333 334 TAPDEBUG("tapcreate(%s%d). minor = %#x\n", name, unit, minor(dev)); 335 336 if (!(dev->si_flags & SI_NAMED)) 337 dev = make_dev(&tap_cdevsw, minor(dev), UID_ROOT, GID_WHEEL, 338 0600, "%s%d", name, unit); 339 340 /* generate fake MAC address: 00 bd xx xx xx unit_no */ 341 macaddr_hi = htons(0x00bd); 342 bcopy(&macaddr_hi, &tp->arpcom.ac_enaddr[0], sizeof(short)); 343 bcopy(&ticks, &tp->arpcom.ac_enaddr[2], sizeof(long)); 344 tp->arpcom.ac_enaddr[5] = (u_char)unit; 345 346 /* fill the rest and attach interface */ 347 ifp = &tp->tap_if; 348 ifp->if_softc = tp; 349 ifp->if_unit = unit; 350 ifp->if_name = name; 351 ifp->if_init = tapifinit; 352 ifp->if_start = tapifstart; 353 ifp->if_ioctl = tapifioctl; 354 ifp->if_mtu = ETHERMTU; 355 ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST); 356 ifp->if_snd.ifq_maxlen = ifqmaxlen; 357 358 dev->si_drv1 = tp; 359 360 s = splimp(); 361 ether_ifattach(ifp, tp->arpcom.ac_enaddr); 362 splx(s); 363 364 tp->tap_flags |= TAP_INITED; 365 366 TAPDEBUG("interface %s%d is created. minor = %#x\n", 367 ifp->if_name, ifp->if_unit, minor(dev)); 368 } /* tapcreate */ 369 370 371 /* 372 * tapopen 373 * 374 * to open tunnel. must be superuser 375 */ 376 static int 377 tapopen(dev, flag, mode, td) 378 dev_t dev; 379 int flag; 380 int mode; 381 struct thread *td; 382 { 383 struct tap_softc *tp = NULL; 384 int unit, error; 385 struct resource *r = NULL; 386 387 if ((error = suser(td)) != 0) 388 return (error); 389 390 unit = dev2unit(dev) & TAPMAXUNIT; 391 392 if (minor(dev) & VMNET_DEV_MASK) 393 r = rman_reserve_resource(vmnetunits, unit, unit, 1, 394 RF_ALLOCATED | RF_ACTIVE, NULL); 395 else 396 r = rman_reserve_resource(tapunits, unit, unit, 1, 397 RF_ALLOCATED | RF_ACTIVE, NULL); 398 399 if (r == NULL) 400 return (EBUSY); 401 402 dev->si_flags &= ~SI_CHEAPCLONE; 403 404 tp = dev->si_drv1; 405 if (tp == NULL) { 406 tapcreate(dev); 407 tp = dev->si_drv1; 408 } 409 410 KASSERT(!(tp->tap_flags & TAP_OPEN), 411 ("%s%d flags is out of sync", tp->tap_if.if_name, unit)); 412 413 bcopy(tp->arpcom.ac_enaddr, tp->ether_addr, sizeof(tp->ether_addr)); 414 415 tp->tap_unit = r; 416 tp->tap_pid = td->td_proc->p_pid; 417 tp->tap_flags |= TAP_OPEN; 418 419 TAPDEBUG("%s%d is open. minor = %#x\n", 420 tp->tap_if.if_name, unit, minor(dev)); 421 422 return (0); 423 } /* tapopen */ 424 425 426 /* 427 * tapclose 428 * 429 * close the device - mark i/f down & delete routing info 430 */ 431 static int 432 tapclose(dev, foo, bar, td) 433 dev_t dev; 434 int foo; 435 int bar; 436 struct thread *td; 437 { 438 int s, error; 439 struct tap_softc *tp = dev->si_drv1; 440 struct ifnet *ifp = &tp->tap_if; 441 442 KASSERT((tp->tap_unit != NULL), 443 ("%s%d is not open", ifp->if_name, ifp->if_unit)); 444 445 /* junk all pending output */ 446 IF_DRAIN(&ifp->if_snd); 447 448 /* 449 * do not bring the interface down, and do not anything with 450 * interface, if we are in VMnet mode. just close the device. 451 */ 452 453 if (((tp->tap_flags & TAP_VMNET) == 0) && (ifp->if_flags & IFF_UP)) { 454 s = splimp(); 455 if_down(ifp); 456 if (ifp->if_flags & IFF_RUNNING) { 457 /* find internet addresses and delete routes */ 458 struct ifaddr *ifa = NULL; 459 460 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 461 if (ifa->ifa_addr->sa_family == AF_INET) { 462 rtinit(ifa, (int)RTM_DELETE, 0); 463 464 /* remove address from interface */ 465 bzero(ifa->ifa_addr, 466 sizeof(*(ifa->ifa_addr))); 467 bzero(ifa->ifa_dstaddr, 468 sizeof(*(ifa->ifa_dstaddr))); 469 bzero(ifa->ifa_netmask, 470 sizeof(*(ifa->ifa_netmask))); 471 } 472 } 473 474 ifp->if_flags &= ~IFF_RUNNING; 475 } 476 splx(s); 477 } 478 479 funsetown(&tp->tap_sigio); 480 selwakeup(&tp->tap_rsel); 481 482 tp->tap_flags &= ~TAP_OPEN; 483 tp->tap_pid = 0; 484 error = rman_release_resource(tp->tap_unit); 485 KASSERT((error == 0), 486 ("%s%d could not release unit", ifp->if_name, ifp->if_unit)); 487 tp->tap_unit = NULL; 488 489 TAPDEBUG("%s%d is closed. minor = %#x\n", 490 ifp->if_name, ifp->if_unit, minor(dev)); 491 492 return (0); 493 } /* tapclose */ 494 495 496 /* 497 * tapifinit 498 * 499 * network interface initialization function 500 */ 501 static void 502 tapifinit(xtp) 503 void *xtp; 504 { 505 struct tap_softc *tp = (struct tap_softc *)xtp; 506 struct ifnet *ifp = &tp->tap_if; 507 508 TAPDEBUG("initializing %s%d\n", ifp->if_name, ifp->if_unit); 509 510 ifp->if_flags |= IFF_RUNNING; 511 ifp->if_flags &= ~IFF_OACTIVE; 512 513 /* attempt to start output */ 514 tapifstart(ifp); 515 } /* tapifinit */ 516 517 518 /* 519 * tapifioctl 520 * 521 * Process an ioctl request on network interface 522 */ 523 static int 524 tapifioctl(ifp, cmd, data) 525 struct ifnet *ifp; 526 u_long cmd; 527 caddr_t data; 528 { 529 struct tap_softc *tp = (struct tap_softc *)(ifp->if_softc); 530 struct ifstat *ifs = NULL; 531 int s, dummy; 532 533 switch (cmd) { 534 case SIOCSIFFLAGS: /* XXX -- just like vmnet does */ 535 case SIOCADDMULTI: 536 case SIOCDELMULTI: 537 break; 538 539 case SIOCGIFSTATUS: 540 s = splimp(); 541 ifs = (struct ifstat *)data; 542 dummy = strlen(ifs->ascii); 543 if (tp->tap_pid != 0 && dummy < sizeof(ifs->ascii)) 544 snprintf(ifs->ascii + dummy, 545 sizeof(ifs->ascii) - dummy, 546 "\tOpened by PID %d\n", tp->tap_pid); 547 splx(s); 548 break; 549 550 default: 551 s = splimp(); 552 dummy = ether_ioctl(ifp, cmd, data); 553 splx(s); 554 return (dummy); 555 } 556 557 return (0); 558 } /* tapifioctl */ 559 560 561 /* 562 * tapifstart 563 * 564 * queue packets from higher level ready to put out 565 */ 566 static void 567 tapifstart(ifp) 568 struct ifnet *ifp; 569 { 570 struct tap_softc *tp = ifp->if_softc; 571 int s; 572 573 TAPDEBUG("%s%d starting\n", ifp->if_name, ifp->if_unit); 574 575 /* 576 * do not junk pending output if we are in VMnet mode. 577 * XXX: can this do any harm because of queue overflow? 578 */ 579 580 if (((tp->tap_flags & TAP_VMNET) == 0) && 581 ((tp->tap_flags & TAP_READY) != TAP_READY)) { 582 struct mbuf *m = NULL; 583 584 TAPDEBUG("%s%d not ready, tap_flags = 0x%x\n", ifp->if_name, 585 ifp->if_unit, tp->tap_flags); 586 587 s = splimp(); 588 do { 589 IF_DEQUEUE(&ifp->if_snd, m); 590 if (m != NULL) 591 m_freem(m); 592 ifp->if_oerrors ++; 593 } while (m != NULL); 594 splx(s); 595 596 return; 597 } 598 599 s = splimp(); 600 ifp->if_flags |= IFF_OACTIVE; 601 602 if (ifp->if_snd.ifq_len != 0) { 603 if (tp->tap_flags & TAP_RWAIT) { 604 tp->tap_flags &= ~TAP_RWAIT; 605 wakeup(tp); 606 } 607 608 if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) 609 pgsigio(&tp->tap_sigio, SIGIO, 0); 610 611 selwakeup(&tp->tap_rsel); 612 ifp->if_opackets ++; /* obytes are counted in ether_output */ 613 } 614 615 ifp->if_flags &= ~IFF_OACTIVE; 616 splx(s); 617 } /* tapifstart */ 618 619 620 /* 621 * tapioctl 622 * 623 * the cdevsw interface is now pretty minimal 624 */ 625 static int 626 tapioctl(dev, cmd, data, flag, td) 627 dev_t dev; 628 u_long cmd; 629 caddr_t data; 630 int flag; 631 struct thread *td; 632 { 633 struct tap_softc *tp = dev->si_drv1; 634 struct ifnet *ifp = &tp->tap_if; 635 struct tapinfo *tapp = NULL; 636 int s; 637 int f; 638 639 switch (cmd) { 640 case TAPSIFINFO: 641 s = splimp(); 642 tapp = (struct tapinfo *)data; 643 ifp->if_mtu = tapp->mtu; 644 ifp->if_type = tapp->type; 645 ifp->if_baudrate = tapp->baudrate; 646 splx(s); 647 break; 648 649 case TAPGIFINFO: 650 tapp = (struct tapinfo *)data; 651 tapp->mtu = ifp->if_mtu; 652 tapp->type = ifp->if_type; 653 tapp->baudrate = ifp->if_baudrate; 654 break; 655 656 case TAPSDEBUG: 657 tapdebug = *(int *)data; 658 break; 659 660 case TAPGDEBUG: 661 *(int *)data = tapdebug; 662 break; 663 664 case FIONBIO: 665 break; 666 667 case FIOASYNC: 668 s = splimp(); 669 if (*(int *)data) 670 tp->tap_flags |= TAP_ASYNC; 671 else 672 tp->tap_flags &= ~TAP_ASYNC; 673 splx(s); 674 break; 675 676 case FIONREAD: 677 s = splimp(); 678 if (ifp->if_snd.ifq_head) { 679 struct mbuf *mb = ifp->if_snd.ifq_head; 680 681 for(*(int *)data = 0;mb != NULL;mb = mb->m_next) 682 *(int *)data += mb->m_len; 683 } else 684 *(int *)data = 0; 685 splx(s); 686 break; 687 688 case FIOSETOWN: 689 return (fsetown(*(int *)data, &tp->tap_sigio)); 690 691 case FIOGETOWN: 692 *(int *)data = fgetown(&tp->tap_sigio); 693 return (0); 694 695 /* this is deprecated, FIOSETOWN should be used instead */ 696 case TIOCSPGRP: 697 return (fsetown(-(*(int *)data), &tp->tap_sigio)); 698 699 /* this is deprecated, FIOGETOWN should be used instead */ 700 case TIOCGPGRP: 701 *(int *)data = -fgetown(&tp->tap_sigio); 702 return (0); 703 704 /* VMware/VMnet port ioctl's */ 705 706 case SIOCGIFFLAGS: /* get ifnet flags */ 707 bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags)); 708 break; 709 710 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 711 f = *(int *)data; 712 f &= 0x0fff; 713 f &= ~IFF_CANTCHANGE; 714 f |= IFF_UP; 715 716 s = splimp(); 717 ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE); 718 splx(s); 719 break; 720 721 case OSIOCGIFADDR: /* get MAC address of the remote side */ 722 case SIOCGIFADDR: 723 bcopy(tp->ether_addr, data, sizeof(tp->ether_addr)); 724 break; 725 726 case SIOCSIFADDR: /* set MAC address of the remote side */ 727 bcopy(data, tp->ether_addr, sizeof(tp->ether_addr)); 728 break; 729 730 default: 731 return (ENOTTY); 732 } 733 return (0); 734 } /* tapioctl */ 735 736 737 /* 738 * tapread 739 * 740 * the cdevsw read interface - reads a packet at a time, or at 741 * least as much of a packet as can be read 742 */ 743 static int 744 tapread(dev, uio, flag) 745 dev_t dev; 746 struct uio *uio; 747 int flag; 748 { 749 struct tap_softc *tp = dev->si_drv1; 750 struct ifnet *ifp = &tp->tap_if; 751 struct mbuf *m = NULL; 752 int error = 0, len, s; 753 754 TAPDEBUG("%s%d reading, minor = %#x\n", 755 ifp->if_name, ifp->if_unit, minor(dev)); 756 757 if ((tp->tap_flags & TAP_READY) != TAP_READY) { 758 TAPDEBUG("%s%d not ready. minor = %#x, tap_flags = 0x%x\n", 759 ifp->if_name, ifp->if_unit, minor(dev), tp->tap_flags); 760 761 return (EHOSTDOWN); 762 } 763 764 tp->tap_flags &= ~TAP_RWAIT; 765 766 /* sleep until we get a packet */ 767 do { 768 s = splimp(); 769 IF_DEQUEUE(&ifp->if_snd, m); 770 splx(s); 771 772 if (m == NULL) { 773 if (flag & IO_NDELAY) 774 return (EWOULDBLOCK); 775 776 tp->tap_flags |= TAP_RWAIT; 777 error = tsleep(tp,PCATCH|(PZERO+1),"taprd",0); 778 if (error) 779 return (error); 780 } 781 } while (m == NULL); 782 783 /* feed packet to bpf */ 784 BPF_MTAP(ifp, m); 785 786 /* xfer packet to user space */ 787 while ((m != NULL) && (uio->uio_resid > 0) && (error == 0)) { 788 len = min(uio->uio_resid, m->m_len); 789 if (len == 0) 790 break; 791 792 error = uiomove(mtod(m, void *), len, uio); 793 m = m_free(m); 794 } 795 796 if (m != NULL) { 797 TAPDEBUG("%s%d dropping mbuf, minor = %#x\n", ifp->if_name, 798 ifp->if_unit, minor(dev)); 799 m_freem(m); 800 } 801 802 return (error); 803 } /* tapread */ 804 805 806 /* 807 * tapwrite 808 * 809 * the cdevsw write interface - an atomic write is a packet - or else! 810 */ 811 static int 812 tapwrite(dev, uio, flag) 813 dev_t dev; 814 struct uio *uio; 815 int flag; 816 { 817 struct tap_softc *tp = dev->si_drv1; 818 struct ifnet *ifp = &tp->tap_if; 819 struct mbuf *top = NULL, **mp = NULL, *m = NULL; 820 int error = 0, tlen, mlen; 821 822 TAPDEBUG("%s%d writting, minor = %#x\n", 823 ifp->if_name, ifp->if_unit, minor(dev)); 824 825 if (uio->uio_resid == 0) 826 return (0); 827 828 if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) { 829 TAPDEBUG("%s%d invalid packet len = %d, minor = %#x\n", 830 ifp->if_name, ifp->if_unit, uio->uio_resid, minor(dev)); 831 832 return (EIO); 833 } 834 tlen = uio->uio_resid; 835 836 /* get a header mbuf */ 837 MGETHDR(m, M_DONTWAIT, MT_DATA); 838 if (m == NULL) 839 return (ENOBUFS); 840 mlen = MHLEN; 841 842 top = 0; 843 mp = ⊤ 844 while ((error == 0) && (uio->uio_resid > 0)) { 845 m->m_len = min(mlen, uio->uio_resid); 846 error = uiomove(mtod(m, void *), m->m_len, uio); 847 *mp = m; 848 mp = &m->m_next; 849 if (uio->uio_resid > 0) { 850 MGET(m, M_DONTWAIT, MT_DATA); 851 if (m == NULL) { 852 error = ENOBUFS; 853 break; 854 } 855 mlen = MLEN; 856 } 857 } 858 if (error) { 859 ifp->if_ierrors ++; 860 if (top) 861 m_freem(top); 862 return (error); 863 } 864 865 top->m_pkthdr.len = tlen; 866 top->m_pkthdr.rcvif = ifp; 867 868 /* Pass packet up to parent. */ 869 (*ifp->if_input)(ifp, top); 870 ifp->if_ipackets ++; /* ibytes are counted in parent */ 871 872 return (0); 873 } /* tapwrite */ 874 875 876 /* 877 * tappoll 878 * 879 * the poll interface, this is only useful on reads 880 * really. the write detect always returns true, write never blocks 881 * anyway, it either accepts the packet or drops it 882 */ 883 static int 884 tappoll(dev, events, td) 885 dev_t dev; 886 int events; 887 struct thread *td; 888 { 889 struct tap_softc *tp = dev->si_drv1; 890 struct ifnet *ifp = &tp->tap_if; 891 int s, revents = 0; 892 893 TAPDEBUG("%s%d polling, minor = %#x\n", 894 ifp->if_name, ifp->if_unit, minor(dev)); 895 896 s = splimp(); 897 if (events & (POLLIN | POLLRDNORM)) { 898 if (ifp->if_snd.ifq_len > 0) { 899 TAPDEBUG("%s%d have data in queue. len = %d, " \ 900 "minor = %#x\n", ifp->if_name, ifp->if_unit, 901 ifp->if_snd.ifq_len, minor(dev)); 902 903 revents |= (events & (POLLIN | POLLRDNORM)); 904 } else { 905 TAPDEBUG("%s%d waiting for data, minor = %#x\n", 906 ifp->if_name, ifp->if_unit, minor(dev)); 907 908 selrecord(td, &tp->tap_rsel); 909 } 910 } 911 912 if (events & (POLLOUT | POLLWRNORM)) 913 revents |= (events & (POLLOUT | POLLWRNORM)); 914 915 splx(s); 916 return (revents); 917 } /* tappoll */
Cache object: d2d0bfe801130c007a60388efe7509a3
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