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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/6.0/sys/net/if_tap.c 149443 2005-08-25 05:01:24Z rwatson $ 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/fcntl.h> 43 #include <sys/filio.h> 44 #include <sys/kernel.h> 45 #include <sys/malloc.h> 46 #include <sys/mbuf.h> 47 #include <sys/module.h> 48 #include <sys/poll.h> 49 #include <sys/proc.h> 50 #include <sys/selinfo.h> 51 #include <sys/signalvar.h> 52 #include <sys/socket.h> 53 #include <sys/sockio.h> 54 #include <sys/sysctl.h> 55 #include <sys/systm.h> 56 #include <sys/ttycom.h> 57 #include <sys/uio.h> 58 #include <sys/queue.h> 59 60 #include <net/bpf.h> 61 #include <net/ethernet.h> 62 #include <net/if.h> 63 #include <net/if_arp.h> 64 #include <net/route.h> 65 #include <net/if_types.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 TAPDEBUG if (tapdebug) printf 75 76 #define TAP "tap" 77 #define VMNET "vmnet" 78 #define TAPMAXUNIT 0x7fff 79 #define VMNET_DEV_MASK CLONE_FLAG0 80 81 /* module */ 82 static int tapmodevent(module_t, int, void *); 83 84 /* device */ 85 static void tapclone(void *, struct ucred *, char *, int, 86 struct cdev **); 87 static void tapcreate(struct cdev *); 88 89 /* network interface */ 90 static void tapifstart(struct ifnet *); 91 static int tapifioctl(struct ifnet *, u_long, caddr_t); 92 static void tapifinit(void *); 93 94 /* character device */ 95 static d_open_t tapopen; 96 static d_close_t tapclose; 97 static d_read_t tapread; 98 static d_write_t tapwrite; 99 static d_ioctl_t tapioctl; 100 static d_poll_t tappoll; 101 102 static struct cdevsw tap_cdevsw = { 103 .d_version = D_VERSION, 104 .d_flags = D_PSEUDO | D_NEEDGIANT, 105 .d_open = tapopen, 106 .d_close = tapclose, 107 .d_read = tapread, 108 .d_write = tapwrite, 109 .d_ioctl = tapioctl, 110 .d_poll = tappoll, 111 .d_name = CDEV_NAME, 112 }; 113 114 /* 115 * All global variables in if_tap.c are locked with tapmtx, with the 116 * exception of tapdebug, which is accessed unlocked; tapclones is 117 * static at runtime. 118 */ 119 static struct mtx tapmtx; 120 static int tapdebug = 0; /* debug flag */ 121 static int tapuopen = 0; /* allow user open() */ 122 static SLIST_HEAD(, tap_softc) taphead; /* first device */ 123 static struct clonedevs *tapclones; 124 125 MALLOC_DECLARE(M_TAP); 126 MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface"); 127 SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, ""); 128 129 SYSCTL_DECL(_net_link); 130 SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0, 131 "Ethernet tunnel software network interface"); 132 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0, 133 "Allow user to open /dev/tap (based on node permissions)"); 134 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, ""); 135 136 DEV_MODULE(if_tap, tapmodevent, NULL); 137 138 /* 139 * tapmodevent 140 * 141 * module event handler 142 */ 143 static int 144 tapmodevent(mod, type, data) 145 module_t mod; 146 int type; 147 void *data; 148 { 149 static eventhandler_tag eh_tag = NULL; 150 struct tap_softc *tp = NULL; 151 struct ifnet *ifp = NULL; 152 int s; 153 154 switch (type) { 155 case MOD_LOAD: 156 157 /* intitialize device */ 158 159 mtx_init(&tapmtx, "tapmtx", NULL, MTX_DEF); 160 SLIST_INIT(&taphead); 161 162 clone_setup(&tapclones); 163 eh_tag = EVENTHANDLER_REGISTER(dev_clone, tapclone, 0, 1000); 164 if (eh_tag == NULL) { 165 clone_cleanup(&tapclones); 166 mtx_destroy(&tapmtx); 167 return (ENOMEM); 168 } 169 return (0); 170 171 case MOD_UNLOAD: 172 /* 173 * The EBUSY algorithm here can't quite atomically 174 * guarantee that this is race-free since we have to 175 * release the tap mtx to deregister the clone handler. 176 */ 177 mtx_lock(&tapmtx); 178 SLIST_FOREACH(tp, &taphead, tap_next) { 179 mtx_lock(&tp->tap_mtx); 180 if (tp->tap_flags & TAP_OPEN) { 181 mtx_unlock(&tp->tap_mtx); 182 mtx_unlock(&tapmtx); 183 return (EBUSY); 184 } 185 mtx_unlock(&tp->tap_mtx); 186 } 187 mtx_unlock(&tapmtx); 188 189 EVENTHANDLER_DEREGISTER(dev_clone, eh_tag); 190 191 mtx_lock(&tapmtx); 192 while ((tp = SLIST_FIRST(&taphead)) != NULL) { 193 SLIST_REMOVE_HEAD(&taphead, tap_next); 194 mtx_unlock(&tapmtx); 195 196 ifp = tp->tap_ifp; 197 198 TAPDEBUG("detaching %s\n", ifp->if_xname); 199 200 /* Unlocked read. */ 201 KASSERT(!(tp->tap_flags & TAP_OPEN), 202 ("%s flags is out of sync", ifp->if_xname)); 203 204 destroy_dev(tp->tap_dev); 205 s = splimp(); 206 ether_ifdetach(ifp); 207 if_free_type(ifp, IFT_ETHER); 208 splx(s); 209 210 mtx_destroy(&tp->tap_mtx); 211 free(tp, M_TAP); 212 mtx_lock(&tapmtx); 213 } 214 mtx_unlock(&tapmtx); 215 clone_cleanup(&tapclones); 216 217 mtx_destroy(&tapmtx); 218 219 break; 220 221 default: 222 return (EOPNOTSUPP); 223 } 224 225 return (0); 226 } /* tapmodevent */ 227 228 229 /* 230 * DEVFS handler 231 * 232 * We need to support two kind of devices - tap and vmnet 233 */ 234 static void 235 tapclone(arg, cred, name, namelen, dev) 236 void *arg; 237 struct ucred *cred; 238 char *name; 239 int namelen; 240 struct cdev **dev; 241 { 242 u_int extra; 243 int i, unit; 244 char *device_name = name; 245 246 if (*dev != NULL) 247 return; 248 249 device_name = TAP; 250 extra = 0; 251 if (strcmp(name, TAP) == 0) { 252 unit = -1; 253 } else if (strcmp(name, VMNET) == 0) { 254 device_name = VMNET; 255 extra = VMNET_DEV_MASK; 256 unit = -1; 257 } else if (dev_stdclone(name, NULL, device_name, &unit) != 1) { 258 device_name = VMNET; 259 extra = VMNET_DEV_MASK; 260 if (dev_stdclone(name, NULL, device_name, &unit) != 1) 261 return; 262 } 263 264 /* find any existing device, or allocate new unit number */ 265 i = clone_create(&tapclones, &tap_cdevsw, &unit, dev, extra); 266 if (i) { 267 *dev = make_dev(&tap_cdevsw, unit2minor(unit | extra), 268 UID_ROOT, GID_WHEEL, 0600, "%s%d", device_name, unit); 269 if (*dev != NULL) { 270 dev_ref(*dev); 271 (*dev)->si_flags |= SI_CHEAPCLONE; 272 } 273 } 274 } /* tapclone */ 275 276 277 /* 278 * tapcreate 279 * 280 * to create interface 281 */ 282 static void 283 tapcreate(dev) 284 struct cdev *dev; 285 { 286 struct ifnet *ifp = NULL; 287 struct tap_softc *tp = NULL; 288 unsigned short macaddr_hi; 289 int unit, s; 290 char *name = NULL; 291 u_char eaddr[6]; 292 293 dev->si_flags &= ~SI_CHEAPCLONE; 294 295 /* allocate driver storage and create device */ 296 MALLOC(tp, struct tap_softc *, sizeof(*tp), M_TAP, M_WAITOK | M_ZERO); 297 mtx_init(&tp->tap_mtx, "tap_mtx", NULL, MTX_DEF); 298 mtx_lock(&tapmtx); 299 SLIST_INSERT_HEAD(&taphead, tp, tap_next); 300 mtx_unlock(&tapmtx); 301 302 unit = dev2unit(dev); 303 304 /* select device: tap or vmnet */ 305 if (unit & VMNET_DEV_MASK) { 306 name = VMNET; 307 tp->tap_flags |= TAP_VMNET; 308 } else 309 name = TAP; 310 311 unit &= TAPMAXUNIT; 312 313 TAPDEBUG("tapcreate(%s%d). minor = %#x\n", name, unit, minor(dev)); 314 315 /* generate fake MAC address: 00 bd xx xx xx unit_no */ 316 macaddr_hi = htons(0x00bd); 317 bcopy(&macaddr_hi, eaddr, sizeof(short)); 318 bcopy(&ticks, &eaddr[2], sizeof(long)); 319 eaddr[5] = (u_char)unit; 320 321 /* fill the rest and attach interface */ 322 ifp = tp->tap_ifp = if_alloc(IFT_ETHER); 323 if (ifp == NULL) 324 panic("%s%d: can not if_alloc()", name, unit); 325 ifp->if_softc = tp; 326 if_initname(ifp, name, unit); 327 ifp->if_init = tapifinit; 328 ifp->if_start = tapifstart; 329 ifp->if_ioctl = tapifioctl; 330 ifp->if_mtu = ETHERMTU; 331 ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST); 332 ifp->if_snd.ifq_maxlen = ifqmaxlen; 333 334 dev->si_drv1 = tp; 335 tp->tap_dev = dev; 336 337 s = splimp(); 338 ether_ifattach(ifp, eaddr); 339 splx(s); 340 341 mtx_lock(&tp->tap_mtx); 342 tp->tap_flags |= TAP_INITED; 343 mtx_unlock(&tp->tap_mtx); 344 345 TAPDEBUG("interface %s is created. minor = %#x\n", 346 ifp->if_xname, minor(dev)); 347 } /* tapcreate */ 348 349 350 /* 351 * tapopen 352 * 353 * to open tunnel. must be superuser 354 */ 355 static int 356 tapopen(dev, flag, mode, td) 357 struct cdev *dev; 358 int flag; 359 int mode; 360 struct thread *td; 361 { 362 struct tap_softc *tp = NULL; 363 struct ifnet *ifp = NULL; 364 int s; 365 366 if (tapuopen == 0 && suser(td) != 0) 367 return (EPERM); 368 369 if ((dev2unit(dev) & CLONE_UNITMASK) > TAPMAXUNIT) 370 return (ENXIO); 371 372 /* 373 * XXXRW: Non-atomic test-and-set of si_drv1. Currently protected 374 * by Giant, but the race actually exists under memory pressure as 375 * well even when running with Giant, as malloc() may sleep. 376 */ 377 tp = dev->si_drv1; 378 if (tp == NULL) { 379 tapcreate(dev); 380 tp = dev->si_drv1; 381 } 382 383 mtx_lock(&tp->tap_mtx); 384 if (tp->tap_flags & TAP_OPEN) { 385 mtx_unlock(&tp->tap_mtx); 386 return (EBUSY); 387 } 388 389 bcopy(IFP2ENADDR(tp->tap_ifp), tp->ether_addr, sizeof(tp->ether_addr)); 390 tp->tap_pid = td->td_proc->p_pid; 391 tp->tap_flags |= TAP_OPEN; 392 ifp = tp->tap_ifp; 393 mtx_unlock(&tp->tap_mtx); 394 395 s = splimp(); 396 ifp->if_drv_flags |= IFF_DRV_RUNNING; 397 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 398 splx(s); 399 400 TAPDEBUG("%s is open. minor = %#x\n", ifp->if_xname, minor(dev)); 401 402 return (0); 403 } /* tapopen */ 404 405 406 /* 407 * tapclose 408 * 409 * close the device - mark i/f down & delete routing info 410 */ 411 static int 412 tapclose(dev, foo, bar, td) 413 struct cdev *dev; 414 int foo; 415 int bar; 416 struct thread *td; 417 { 418 struct ifaddr *ifa; 419 struct tap_softc *tp = dev->si_drv1; 420 struct ifnet *ifp = tp->tap_ifp; 421 int s; 422 423 /* junk all pending output */ 424 IF_DRAIN(&ifp->if_snd); 425 426 /* 427 * do not bring the interface down, and do not anything with 428 * interface, if we are in VMnet mode. just close the device. 429 */ 430 431 mtx_lock(&tp->tap_mtx); 432 if (((tp->tap_flags & TAP_VMNET) == 0) && (ifp->if_flags & IFF_UP)) { 433 mtx_unlock(&tp->tap_mtx); 434 s = splimp(); 435 if_down(ifp); 436 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 437 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 438 rtinit(ifa, (int)RTM_DELETE, 0); 439 } 440 if_purgeaddrs(ifp); 441 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 442 } 443 splx(s); 444 } else 445 mtx_unlock(&tp->tap_mtx); 446 447 funsetown(&tp->tap_sigio); 448 selwakeuppri(&tp->tap_rsel, PZERO+1); 449 450 mtx_lock(&tp->tap_mtx); 451 tp->tap_flags &= ~TAP_OPEN; 452 tp->tap_pid = 0; 453 mtx_unlock(&tp->tap_mtx); 454 455 TAPDEBUG("%s is closed. minor = %#x\n", 456 ifp->if_xname, minor(dev)); 457 458 return (0); 459 } /* tapclose */ 460 461 462 /* 463 * tapifinit 464 * 465 * network interface initialization function 466 */ 467 static void 468 tapifinit(xtp) 469 void *xtp; 470 { 471 struct tap_softc *tp = (struct tap_softc *)xtp; 472 struct ifnet *ifp = tp->tap_ifp; 473 474 TAPDEBUG("initializing %s\n", ifp->if_xname); 475 476 ifp->if_drv_flags |= IFF_DRV_RUNNING; 477 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 478 479 /* attempt to start output */ 480 tapifstart(ifp); 481 } /* tapifinit */ 482 483 484 /* 485 * tapifioctl 486 * 487 * Process an ioctl request on network interface 488 */ 489 static int 490 tapifioctl(ifp, cmd, data) 491 struct ifnet *ifp; 492 u_long cmd; 493 caddr_t data; 494 { 495 struct tap_softc *tp = (struct tap_softc *)(ifp->if_softc); 496 struct ifstat *ifs = NULL; 497 int s, dummy; 498 499 switch (cmd) { 500 case SIOCSIFFLAGS: /* XXX -- just like vmnet does */ 501 case SIOCADDMULTI: 502 case SIOCDELMULTI: 503 break; 504 505 case SIOCGIFSTATUS: 506 s = splimp(); 507 ifs = (struct ifstat *)data; 508 dummy = strlen(ifs->ascii); 509 mtx_lock(&tp->tap_mtx); 510 if (tp->tap_pid != 0 && dummy < sizeof(ifs->ascii)) 511 snprintf(ifs->ascii + dummy, 512 sizeof(ifs->ascii) - dummy, 513 "\tOpened by PID %d\n", tp->tap_pid); 514 mtx_unlock(&tp->tap_mtx); 515 splx(s); 516 break; 517 518 default: 519 s = splimp(); 520 dummy = ether_ioctl(ifp, cmd, data); 521 splx(s); 522 return (dummy); 523 } 524 525 return (0); 526 } /* tapifioctl */ 527 528 529 /* 530 * tapifstart 531 * 532 * queue packets from higher level ready to put out 533 */ 534 static void 535 tapifstart(ifp) 536 struct ifnet *ifp; 537 { 538 struct tap_softc *tp = ifp->if_softc; 539 int s; 540 541 TAPDEBUG("%s starting\n", ifp->if_xname); 542 543 /* 544 * do not junk pending output if we are in VMnet mode. 545 * XXX: can this do any harm because of queue overflow? 546 */ 547 548 mtx_lock(&tp->tap_mtx); 549 if (((tp->tap_flags & TAP_VMNET) == 0) && 550 ((tp->tap_flags & TAP_READY) != TAP_READY)) { 551 struct mbuf *m = NULL; 552 553 mtx_unlock(&tp->tap_mtx); 554 555 /* Unlocked read. */ 556 TAPDEBUG("%s not ready, tap_flags = 0x%x\n", ifp->if_xname, 557 tp->tap_flags); 558 559 s = splimp(); 560 do { 561 IF_DEQUEUE(&ifp->if_snd, m); 562 if (m != NULL) 563 m_freem(m); 564 ifp->if_oerrors ++; 565 } while (m != NULL); 566 splx(s); 567 568 return; 569 } 570 mtx_unlock(&tp->tap_mtx); 571 572 s = splimp(); 573 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 574 575 if (ifp->if_snd.ifq_len != 0) { 576 mtx_lock(&tp->tap_mtx); 577 if (tp->tap_flags & TAP_RWAIT) { 578 tp->tap_flags &= ~TAP_RWAIT; 579 wakeup(tp); 580 } 581 582 if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) { 583 mtx_unlock(&tp->tap_mtx); 584 pgsigio(&tp->tap_sigio, SIGIO, 0); 585 } else 586 mtx_unlock(&tp->tap_mtx); 587 588 selwakeuppri(&tp->tap_rsel, PZERO+1); 589 ifp->if_opackets ++; /* obytes are counted in ether_output */ 590 } 591 592 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 593 splx(s); 594 } /* tapifstart */ 595 596 597 /* 598 * tapioctl 599 * 600 * the cdevsw interface is now pretty minimal 601 */ 602 static int 603 tapioctl(dev, cmd, data, flag, td) 604 struct cdev *dev; 605 u_long cmd; 606 caddr_t data; 607 int flag; 608 struct thread *td; 609 { 610 struct tap_softc *tp = dev->si_drv1; 611 struct ifnet *ifp = tp->tap_ifp; 612 struct tapinfo *tapp = NULL; 613 int s; 614 int f; 615 616 switch (cmd) { 617 case TAPSIFINFO: 618 s = splimp(); 619 tapp = (struct tapinfo *)data; 620 ifp->if_mtu = tapp->mtu; 621 ifp->if_type = tapp->type; 622 ifp->if_baudrate = tapp->baudrate; 623 splx(s); 624 break; 625 626 case TAPGIFINFO: 627 tapp = (struct tapinfo *)data; 628 tapp->mtu = ifp->if_mtu; 629 tapp->type = ifp->if_type; 630 tapp->baudrate = ifp->if_baudrate; 631 break; 632 633 case TAPSDEBUG: 634 tapdebug = *(int *)data; 635 break; 636 637 case TAPGDEBUG: 638 *(int *)data = tapdebug; 639 break; 640 641 case FIONBIO: 642 break; 643 644 case FIOASYNC: 645 s = splimp(); 646 mtx_lock(&tp->tap_mtx); 647 if (*(int *)data) 648 tp->tap_flags |= TAP_ASYNC; 649 else 650 tp->tap_flags &= ~TAP_ASYNC; 651 mtx_unlock(&tp->tap_mtx); 652 splx(s); 653 break; 654 655 case FIONREAD: 656 s = splimp(); 657 if (ifp->if_snd.ifq_head) { 658 struct mbuf *mb = ifp->if_snd.ifq_head; 659 660 for(*(int *)data = 0;mb != NULL;mb = mb->m_next) 661 *(int *)data += mb->m_len; 662 } else 663 *(int *)data = 0; 664 splx(s); 665 break; 666 667 case FIOSETOWN: 668 return (fsetown(*(int *)data, &tp->tap_sigio)); 669 670 case FIOGETOWN: 671 *(int *)data = fgetown(&tp->tap_sigio); 672 return (0); 673 674 /* this is deprecated, FIOSETOWN should be used instead */ 675 case TIOCSPGRP: 676 return (fsetown(-(*(int *)data), &tp->tap_sigio)); 677 678 /* this is deprecated, FIOGETOWN should be used instead */ 679 case TIOCGPGRP: 680 *(int *)data = -fgetown(&tp->tap_sigio); 681 return (0); 682 683 /* VMware/VMnet port ioctl's */ 684 685 case SIOCGIFFLAGS: /* get ifnet flags */ 686 bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags)); 687 break; 688 689 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 690 f = *(int *)data; 691 f &= 0x0fff; 692 f &= ~IFF_CANTCHANGE; 693 f |= IFF_UP; 694 695 s = splimp(); 696 ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE); 697 splx(s); 698 break; 699 700 case OSIOCGIFADDR: /* get MAC address of the remote side */ 701 case SIOCGIFADDR: 702 mtx_lock(&tp->tap_mtx); 703 bcopy(tp->ether_addr, data, sizeof(tp->ether_addr)); 704 mtx_unlock(&tp->tap_mtx); 705 break; 706 707 case SIOCSIFADDR: /* set MAC address of the remote side */ 708 mtx_lock(&tp->tap_mtx); 709 bcopy(data, tp->ether_addr, sizeof(tp->ether_addr)); 710 mtx_unlock(&tp->tap_mtx); 711 break; 712 713 default: 714 return (ENOTTY); 715 } 716 return (0); 717 } /* tapioctl */ 718 719 720 /* 721 * tapread 722 * 723 * the cdevsw read interface - reads a packet at a time, or at 724 * least as much of a packet as can be read 725 */ 726 static int 727 tapread(dev, uio, flag) 728 struct cdev *dev; 729 struct uio *uio; 730 int flag; 731 { 732 struct tap_softc *tp = dev->si_drv1; 733 struct ifnet *ifp = tp->tap_ifp; 734 struct mbuf *m = NULL; 735 int error = 0, len, s; 736 737 TAPDEBUG("%s reading, minor = %#x\n", ifp->if_xname, minor(dev)); 738 739 mtx_lock(&tp->tap_mtx); 740 if ((tp->tap_flags & TAP_READY) != TAP_READY) { 741 mtx_unlock(&tp->tap_mtx); 742 743 /* Unlocked read. */ 744 TAPDEBUG("%s not ready. minor = %#x, tap_flags = 0x%x\n", 745 ifp->if_xname, minor(dev), tp->tap_flags); 746 747 return (EHOSTDOWN); 748 } 749 750 tp->tap_flags &= ~TAP_RWAIT; 751 mtx_unlock(&tp->tap_mtx); 752 753 /* sleep until we get a packet */ 754 do { 755 s = splimp(); 756 IF_DEQUEUE(&ifp->if_snd, m); 757 splx(s); 758 759 if (m == NULL) { 760 if (flag & O_NONBLOCK) 761 return (EWOULDBLOCK); 762 763 mtx_lock(&tp->tap_mtx); 764 tp->tap_flags |= TAP_RWAIT; 765 mtx_unlock(&tp->tap_mtx); 766 error = tsleep(tp,PCATCH|(PZERO+1),"taprd",0); 767 if (error) 768 return (error); 769 } 770 } while (m == NULL); 771 772 /* feed packet to bpf */ 773 BPF_MTAP(ifp, m); 774 775 /* xfer packet to user space */ 776 while ((m != NULL) && (uio->uio_resid > 0) && (error == 0)) { 777 len = min(uio->uio_resid, m->m_len); 778 if (len == 0) 779 break; 780 781 error = uiomove(mtod(m, void *), len, uio); 782 m = m_free(m); 783 } 784 785 if (m != NULL) { 786 TAPDEBUG("%s dropping mbuf, minor = %#x\n", ifp->if_xname, 787 minor(dev)); 788 m_freem(m); 789 } 790 791 return (error); 792 } /* tapread */ 793 794 795 /* 796 * tapwrite 797 * 798 * the cdevsw write interface - an atomic write is a packet - or else! 799 */ 800 static int 801 tapwrite(dev, uio, flag) 802 struct cdev *dev; 803 struct uio *uio; 804 int flag; 805 { 806 struct tap_softc *tp = dev->si_drv1; 807 struct ifnet *ifp = tp->tap_ifp; 808 struct mbuf *m; 809 int error = 0; 810 811 TAPDEBUG("%s writting, minor = %#x\n", 812 ifp->if_xname, minor(dev)); 813 814 if (uio->uio_resid == 0) 815 return (0); 816 817 if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) { 818 TAPDEBUG("%s invalid packet len = %d, minor = %#x\n", 819 ifp->if_xname, uio->uio_resid, minor(dev)); 820 821 return (EIO); 822 } 823 824 if ((m = m_uiotombuf(uio, M_DONTWAIT, 0, ETHER_ALIGN)) == NULL) { 825 ifp->if_ierrors ++; 826 return (error); 827 } 828 829 m->m_pkthdr.rcvif = ifp; 830 831 /* Pass packet up to parent. */ 832 (*ifp->if_input)(ifp, m); 833 ifp->if_ipackets ++; /* ibytes are counted in parent */ 834 835 return (0); 836 } /* tapwrite */ 837 838 839 /* 840 * tappoll 841 * 842 * the poll interface, this is only useful on reads 843 * really. the write detect always returns true, write never blocks 844 * anyway, it either accepts the packet or drops it 845 */ 846 static int 847 tappoll(dev, events, td) 848 struct cdev *dev; 849 int events; 850 struct thread *td; 851 { 852 struct tap_softc *tp = dev->si_drv1; 853 struct ifnet *ifp = tp->tap_ifp; 854 int s, revents = 0; 855 856 TAPDEBUG("%s polling, minor = %#x\n", 857 ifp->if_xname, minor(dev)); 858 859 s = splimp(); 860 if (events & (POLLIN | POLLRDNORM)) { 861 if (ifp->if_snd.ifq_len > 0) { 862 TAPDEBUG("%s have data in queue. len = %d, " \ 863 "minor = %#x\n", ifp->if_xname, 864 ifp->if_snd.ifq_len, minor(dev)); 865 866 revents |= (events & (POLLIN | POLLRDNORM)); 867 } else { 868 TAPDEBUG("%s waiting for data, minor = %#x\n", 869 ifp->if_xname, minor(dev)); 870 871 selrecord(td, &tp->tap_rsel); 872 } 873 } 874 875 if (events & (POLLOUT | POLLWRNORM)) 876 revents |= (events & (POLLOUT | POLLWRNORM)); 877 878 splx(s); 879 return (revents); 880 } /* tappoll */
Cache object: a70e2184fbd14e01b6d6f055d33926ce
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