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 1.27 2006/07/28 02:17:40 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/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/thread2.h> 57 #include <sys/ttycom.h> 58 #include <sys/uio.h> 59 #include <sys/vnode.h> 60 #include <sys/serialize.h> 61 62 #include <net/bpf.h> 63 #include <net/ethernet.h> 64 #include <net/if.h> 65 #include <net/ifq_var.h> 66 #include <net/if_arp.h> 67 #include <net/route.h> 68 69 #include <netinet/in.h> 70 71 #include "if_tapvar.h" 72 #include "if_tap.h" 73 74 75 #define CDEV_NAME "tap" 76 #define CDEV_MAJOR 149 77 #define TAPDEBUG if (tapdebug) if_printf 78 79 #define TAP "tap" 80 #define VMNET "vmnet" 81 #define VMNET_DEV_MASK 0x00010000 82 83 /* module */ 84 static int tapmodevent (module_t, int, void *); 85 86 /* device */ 87 static void tapcreate (dev_t); 88 89 /* network interface */ 90 static void tapifstart (struct ifnet *); 91 static int tapifioctl (struct ifnet *, u_long, caddr_t, 92 struct ucred *); 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 dev_ops tap_ops = { 104 { CDEV_NAME, CDEV_MAJOR, 0 }, 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 }; 112 113 static int taprefcnt = 0; /* module ref. counter */ 114 static int taplastunit = -1; /* max. open unit number */ 115 static int tapdebug = 0; /* debug flag */ 116 117 MALLOC_DECLARE(M_TAP); 118 MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface"); 119 SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, ""); 120 DEV_MODULE(if_tap, tapmodevent, NULL); 121 122 /* 123 * tapmodevent 124 * 125 * module event handler 126 */ 127 static int 128 tapmodevent(module_t mod, int type, void *data) 129 { 130 static int attached = 0; 131 struct ifnet *ifp = NULL; 132 int unit; 133 134 switch (type) { 135 case MOD_LOAD: 136 if (attached) 137 return (EEXIST); 138 139 dev_ops_add(&tap_ops, 0, 0); 140 attached = 1; 141 break; 142 143 case MOD_UNLOAD: 144 if (taprefcnt > 0) 145 return (EBUSY); 146 147 dev_ops_remove(&tap_ops, 0, 0); 148 149 /* XXX: maintain tap ifs in a local list */ 150 unit = 0; 151 while (unit <= taplastunit) { 152 TAILQ_FOREACH(ifp, &ifnet, if_link) { 153 if ((strcmp(ifp->if_dname, TAP) == 0) || 154 (strcmp(ifp->if_dname, VMNET) == 0)) { 155 if (ifp->if_dunit == unit) 156 break; 157 } 158 } 159 160 if (ifp != NULL) { 161 struct tap_softc *tp = ifp->if_softc; 162 163 TAPDEBUG(ifp, "detached. minor = %#x, " \ 164 "taplastunit = %d\n", 165 minor(tp->tap_dev), taplastunit); 166 167 ether_ifdetach(ifp); 168 destroy_dev(tp->tap_dev); 169 free(tp, M_TAP); 170 } 171 else 172 unit ++; 173 } 174 175 attached = 0; 176 break; 177 178 default: 179 return (EOPNOTSUPP); 180 } 181 182 return (0); 183 } /* tapmodevent */ 184 185 186 /* 187 * tapcreate 188 * 189 * to create interface 190 */ 191 static void 192 tapcreate(dev_t dev) 193 { 194 struct ifnet *ifp = NULL; 195 struct tap_softc *tp = NULL; 196 uint8_t ether_addr[ETHER_ADDR_LEN]; 197 int unit; 198 char *name = NULL; 199 200 /* allocate driver storage and create device */ 201 MALLOC(tp, struct tap_softc *, sizeof(*tp), M_TAP, M_WAITOK); 202 bzero(tp, sizeof(*tp)); 203 204 /* select device: tap or vmnet */ 205 if (minor(dev) & VMNET_DEV_MASK) { 206 name = VMNET; 207 unit = lminor(dev) & 0xff; 208 tp->tap_flags |= TAP_VMNET; 209 } 210 else { 211 name = TAP; 212 unit = lminor(dev); 213 } 214 215 tp->tap_dev = make_dev(&tap_ops, minor(dev), UID_ROOT, GID_WHEEL, 216 0600, "%s%d", name, unit); 217 tp->tap_dev->si_drv1 = dev->si_drv1 = tp; 218 reference_dev(tp->tap_dev); /* so we can destroy it later */ 219 220 /* generate fake MAC address: 00 bd xx xx xx unit_no */ 221 ether_addr[0] = 0x00; 222 ether_addr[1] = 0xbd; 223 bcopy(&ticks, ether_addr, 4); 224 ether_addr[5] = (u_char)unit; 225 226 /* fill the rest and attach interface */ 227 ifp = &tp->tap_if; 228 ifp->if_softc = tp; 229 230 if_initname(ifp, name, unit); 231 if (unit > taplastunit) 232 taplastunit = unit; 233 234 ifp->if_init = tapifinit; 235 ifp->if_start = tapifstart; 236 ifp->if_ioctl = tapifioctl; 237 ifp->if_mtu = ETHERMTU; 238 ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST); 239 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen); 240 ifq_set_ready(&ifp->if_snd); 241 242 ether_ifattach(ifp, ether_addr, NULL); 243 244 tp->tap_flags |= TAP_INITED; 245 246 TAPDEBUG(ifp, "created. minor = %#x\n", minor(tp->tap_dev)); 247 } /* tapcreate */ 248 249 250 /* 251 * tapopen 252 * 253 * to open tunnel. must be superuser 254 */ 255 static int 256 tapopen(struct dev_open_args *ap) 257 { 258 dev_t dev = ap->a_head.a_dev; 259 struct tap_softc *tp = NULL; 260 int error; 261 262 if ((error = suser_cred(ap->a_cred, 0)) != 0) 263 return (error); 264 265 tp = dev->si_drv1; 266 if (tp == NULL) { 267 tapcreate(dev); 268 tp = dev->si_drv1; 269 } 270 271 if (tp->tap_flags & TAP_OPEN) 272 return (EBUSY); 273 274 bcopy(tp->arpcom.ac_enaddr, tp->ether_addr, sizeof(tp->ether_addr)); 275 276 tp->tap_td = curthread; 277 tp->tap_flags |= TAP_OPEN; 278 taprefcnt ++; 279 280 TAPDEBUG(&tp->arpcom.ac_if, 281 "opened. minor = %#x, refcnt = %d, taplastunit = %d\n", 282 minor(tp->tap_dev), taprefcnt, taplastunit); 283 284 return (0); 285 } /* tapopen */ 286 287 288 /* 289 * tapclose 290 * 291 * close the device - mark i/f down & delete routing info 292 */ 293 static int 294 tapclose(struct dev_close_args *ap) 295 { 296 dev_t dev = ap->a_head.a_dev; 297 struct tap_softc *tp = dev->si_drv1; 298 struct ifnet *ifp = &tp->tap_if; 299 300 /* junk all pending output */ 301 302 lwkt_serialize_enter(ifp->if_serializer); 303 ifq_purge(&ifp->if_snd); 304 lwkt_serialize_exit(ifp->if_serializer); 305 306 /* 307 * do not bring the interface down, and do not anything with 308 * interface, if we are in VMnet mode. just close the device. 309 */ 310 311 if (((tp->tap_flags & TAP_VMNET) == 0) && (ifp->if_flags & IFF_UP)) { 312 if_down(ifp); 313 lwkt_serialize_enter(ifp->if_serializer); 314 if (ifp->if_flags & IFF_RUNNING) { 315 /* find internet addresses and delete routes */ 316 struct ifaddr *ifa = NULL; 317 318 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 319 if (ifa->ifa_addr->sa_family == AF_INET) { 320 rtinit(ifa, (int)RTM_DELETE, 0); 321 322 /* remove address from interface */ 323 bzero(ifa->ifa_addr, 324 sizeof(*(ifa->ifa_addr))); 325 bzero(ifa->ifa_dstaddr, 326 sizeof(*(ifa->ifa_dstaddr))); 327 bzero(ifa->ifa_netmask, 328 sizeof(*(ifa->ifa_netmask))); 329 } 330 } 331 332 ifp->if_flags &= ~IFF_RUNNING; 333 } 334 lwkt_serialize_exit(ifp->if_serializer); 335 } 336 337 funsetown(tp->tap_sigio); 338 selwakeup(&tp->tap_rsel); 339 340 tp->tap_flags &= ~TAP_OPEN; 341 tp->tap_td = NULL; 342 343 taprefcnt --; 344 if (taprefcnt < 0) { 345 taprefcnt = 0; 346 if_printf(ifp, "minor = %#x, refcnt = %d is out of sync. " 347 "set refcnt to 0\n", minor(tp->tap_dev), taprefcnt); 348 } 349 350 TAPDEBUG(ifp, "closed. minor = %#x, refcnt = %d, taplastunit = %d\n", 351 minor(tp->tap_dev), taprefcnt, taplastunit); 352 353 return (0); 354 } /* tapclose */ 355 356 357 /* 358 * tapifinit 359 * 360 * network interface initialization function 361 */ 362 static void 363 tapifinit(void *xtp) 364 { 365 struct tap_softc *tp = (struct tap_softc *)xtp; 366 struct ifnet *ifp = &tp->tap_if; 367 368 TAPDEBUG(ifp, "initializing, minor = %#x\n", minor(tp->tap_dev)); 369 370 ifp->if_flags |= IFF_RUNNING; 371 ifp->if_flags &= ~IFF_OACTIVE; 372 373 /* attempt to start output */ 374 tapifstart(ifp); 375 } /* tapifinit */ 376 377 378 /* 379 * tapifioctl 380 * 381 * Process an ioctl request on network interface 382 * 383 * MPSAFE 384 */ 385 int 386 tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 387 { 388 struct tap_softc *tp = (struct tap_softc *)(ifp->if_softc); 389 struct ifstat *ifs = NULL; 390 int dummy; 391 392 switch (cmd) { 393 case SIOCSIFADDR: 394 case SIOCGIFADDR: 395 case SIOCSIFMTU: 396 dummy = ether_ioctl(ifp, cmd, data); 397 return (dummy); 398 399 case SIOCSIFFLAGS: /* XXX -- just like vmnet does */ 400 case SIOCADDMULTI: 401 case SIOCDELMULTI: 402 break; 403 404 case SIOCGIFSTATUS: 405 ifs = (struct ifstat *)data; 406 dummy = strlen(ifs->ascii); 407 if (tp->tap_td != NULL && dummy < sizeof(ifs->ascii)) { 408 if (tp->tap_td->td_proc) { 409 snprintf(ifs->ascii + dummy, 410 sizeof(ifs->ascii) - dummy, 411 "\tOpened by pid %d\n", 412 (int)tp->tap_td->td_proc->p_pid); 413 } else { 414 snprintf(ifs->ascii + dummy, 415 sizeof(ifs->ascii) - dummy, 416 "\tOpened by td %p\n", tp->tap_td); 417 } 418 } 419 break; 420 421 default: 422 return (EINVAL); 423 } 424 425 return (0); 426 } /* tapifioctl */ 427 428 429 /* 430 * tapifstart 431 * 432 * queue packets from higher level ready to put out 433 */ 434 static void 435 tapifstart(struct ifnet *ifp) 436 { 437 struct tap_softc *tp = ifp->if_softc; 438 439 TAPDEBUG(ifp, "starting, minor = %#x\n", minor(tp->tap_dev)); 440 441 /* 442 * do not junk pending output if we are in VMnet mode. 443 * XXX: can this do any harm because of queue overflow? 444 */ 445 446 if (((tp->tap_flags & TAP_VMNET) == 0) && 447 ((tp->tap_flags & TAP_READY) != TAP_READY)) { 448 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n", 449 minor(tp->tap_dev), tp->tap_flags); 450 451 ifq_purge(&ifp->if_snd); 452 return; 453 } 454 455 ifp->if_flags |= IFF_OACTIVE; 456 457 if (!ifq_is_empty(&ifp->if_snd)) { 458 if (tp->tap_flags & TAP_RWAIT) { 459 tp->tap_flags &= ~TAP_RWAIT; 460 wakeup((caddr_t)tp); 461 } 462 463 if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) 464 pgsigio(tp->tap_sigio, SIGIO, 0); 465 466 /* 467 * selwakeup is not MPSAFE. tapifstart is. 468 */ 469 get_mplock(); 470 selwakeup(&tp->tap_rsel); 471 rel_mplock(); 472 ifp->if_opackets ++; /* obytes are counted in ether_output */ 473 } 474 475 ifp->if_flags &= ~IFF_OACTIVE; 476 } /* tapifstart */ 477 478 479 /* 480 * tapioctl 481 * 482 * the ops interface is now pretty minimal 483 */ 484 static int 485 tapioctl(struct dev_ioctl_args *ap) 486 { 487 dev_t dev = ap->a_head.a_dev; 488 caddr_t data = ap->a_data; 489 struct tap_softc *tp = dev->si_drv1; 490 struct ifnet *ifp = &tp->tap_if; 491 struct tapinfo *tapp = NULL; 492 struct mbuf *mb; 493 short f; 494 int error; 495 496 lwkt_serialize_enter(ifp->if_serializer); 497 error = 0; 498 499 switch (ap->a_cmd) { 500 case TAPSIFINFO: 501 tapp = (struct tapinfo *)data; 502 ifp->if_mtu = tapp->mtu; 503 ifp->if_type = tapp->type; 504 ifp->if_baudrate = tapp->baudrate; 505 break; 506 507 case TAPGIFINFO: 508 tapp = (struct tapinfo *)data; 509 tapp->mtu = ifp->if_mtu; 510 tapp->type = ifp->if_type; 511 tapp->baudrate = ifp->if_baudrate; 512 break; 513 514 case TAPSDEBUG: 515 tapdebug = *(int *)data; 516 break; 517 518 case TAPGDEBUG: 519 *(int *)data = tapdebug; 520 break; 521 522 case FIOASYNC: 523 if (*(int *)data) 524 tp->tap_flags |= TAP_ASYNC; 525 else 526 tp->tap_flags &= ~TAP_ASYNC; 527 break; 528 529 case FIONREAD: 530 *(int *)data = 0; 531 if ((mb = ifq_poll(&ifp->if_snd)) != NULL) { 532 for(; mb != NULL; mb = mb->m_next) 533 *(int *)data += mb->m_len; 534 } 535 break; 536 537 case FIOSETOWN: 538 error = fsetown(*(int *)data, &tp->tap_sigio); 539 break; 540 541 case FIOGETOWN: 542 *(int *)data = fgetown(tp->tap_sigio); 543 break; 544 545 /* this is deprecated, FIOSETOWN should be used instead */ 546 case TIOCSPGRP: 547 error = fsetown(-(*(int *)data), &tp->tap_sigio); 548 break; 549 550 /* this is deprecated, FIOGETOWN should be used instead */ 551 case TIOCGPGRP: 552 *(int *)data = -fgetown(tp->tap_sigio); 553 break; 554 555 /* VMware/VMnet port ioctl's */ 556 557 case SIOCGIFFLAGS: /* get ifnet flags */ 558 bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags)); 559 break; 560 561 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 562 f = *(short *)data; 563 f &= 0x0fff; 564 f &= ~IFF_CANTCHANGE; 565 f |= IFF_UP; 566 ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE); 567 break; 568 569 case OSIOCGIFADDR: /* get MAC address of the remote side */ 570 case SIOCGIFADDR: 571 bcopy(tp->ether_addr, data, sizeof(tp->ether_addr)); 572 break; 573 574 case SIOCSIFADDR: /* set MAC address of the remote side */ 575 bcopy(data, tp->ether_addr, sizeof(tp->ether_addr)); 576 break; 577 578 default: 579 error = ENOTTY; 580 break; 581 } 582 lwkt_serialize_exit(ifp->if_serializer); 583 return (error); 584 } /* tapioctl */ 585 586 587 /* 588 * tapread 589 * 590 * the ops read interface - reads a packet at a time, or at 591 * least as much of a packet as can be read 592 */ 593 static int 594 tapread(struct dev_read_args *ap) 595 { 596 dev_t dev = ap->a_head.a_dev; 597 struct uio *uio = ap->a_uio; 598 struct tap_softc *tp = dev->si_drv1; 599 struct ifnet *ifp = &tp->tap_if; 600 struct mbuf *m0 = NULL; 601 int error = 0, len; 602 603 TAPDEBUG(ifp, "reading, minor = %#x\n", minor(tp->tap_dev)); 604 605 if ((tp->tap_flags & TAP_READY) != TAP_READY) { 606 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n", 607 minor(tp->tap_dev), tp->tap_flags); 608 609 return (EHOSTDOWN); 610 } 611 612 tp->tap_flags &= ~TAP_RWAIT; 613 614 /* sleep until we get a packet */ 615 do { 616 lwkt_serialize_enter(ifp->if_serializer); 617 m0 = ifq_dequeue(&ifp->if_snd, NULL); 618 if (m0 == NULL) { 619 if (ap->a_ioflag & IO_NDELAY) { 620 lwkt_serialize_exit(ifp->if_serializer); 621 return (EWOULDBLOCK); 622 } 623 tp->tap_flags |= TAP_RWAIT; 624 crit_enter(); 625 tsleep_interlock(tp); 626 lwkt_serialize_exit(ifp->if_serializer); 627 error = tsleep(tp, PCATCH, "taprd", 0); 628 crit_exit(); 629 if (error) 630 return (error); 631 } else { 632 lwkt_serialize_exit(ifp->if_serializer); 633 } 634 } while (m0 == NULL); 635 636 BPF_MTAP(ifp, m0); 637 638 /* xfer packet to user space */ 639 while ((m0 != NULL) && (uio->uio_resid > 0) && (error == 0)) { 640 len = min(uio->uio_resid, m0->m_len); 641 if (len == 0) 642 break; 643 644 error = uiomove(mtod(m0, caddr_t), len, uio); 645 m0 = m_free(m0); 646 } 647 648 if (m0 != NULL) { 649 TAPDEBUG(ifp, "dropping mbuf, minor = %#x\n", 650 minor(tp->tap_dev)); 651 m_freem(m0); 652 } 653 654 return (error); 655 } /* tapread */ 656 657 658 /* 659 * tapwrite 660 * 661 * the ops write interface - an atomic write is a packet - or else! 662 */ 663 static int 664 tapwrite(struct dev_write_args *ap) 665 { 666 dev_t dev = ap->a_head.a_dev; 667 struct uio *uio = ap->a_uio; 668 struct tap_softc *tp = dev->si_drv1; 669 struct ifnet *ifp = &tp->tap_if; 670 struct mbuf *top = NULL, **mp = NULL, *m = NULL; 671 int error = 0, tlen, mlen; 672 673 TAPDEBUG(ifp, "writting, minor = %#x\n", minor(tp->tap_dev)); 674 675 if (uio->uio_resid == 0) 676 return (0); 677 678 if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) { 679 TAPDEBUG(ifp, "invalid packet len = %d, minor = %#x\n", 680 uio->uio_resid, minor(tp->tap_dev)); 681 682 return (EIO); 683 } 684 tlen = uio->uio_resid; 685 686 /* get a header mbuf */ 687 MGETHDR(m, MB_DONTWAIT, MT_DATA); 688 if (m == NULL) 689 return (ENOBUFS); 690 mlen = MHLEN; 691 692 top = 0; 693 mp = ⊤ 694 while ((error == 0) && (uio->uio_resid > 0)) { 695 m->m_len = min(mlen, uio->uio_resid); 696 error = uiomove(mtod(m, caddr_t), m->m_len, uio); 697 *mp = m; 698 mp = &m->m_next; 699 if (uio->uio_resid > 0) { 700 MGET(m, MB_DONTWAIT, MT_DATA); 701 if (m == NULL) { 702 error = ENOBUFS; 703 break; 704 } 705 mlen = MLEN; 706 } 707 } 708 if (error) { 709 ifp->if_ierrors ++; 710 if (top) 711 m_freem(top); 712 return (error); 713 } 714 715 top->m_pkthdr.len = tlen; 716 top->m_pkthdr.rcvif = ifp; 717 718 /* 719 * Ethernet bridge and bpf are handled in ether_input 720 * 721 * adjust mbuf and give packet to the ether_input 722 */ 723 lwkt_serialize_enter(ifp->if_serializer); 724 ifp->if_input(ifp, top); 725 ifp->if_ipackets ++; /* ibytes are counted in ether_input */ 726 lwkt_serialize_exit(ifp->if_serializer); 727 728 return (0); 729 } /* tapwrite */ 730 731 732 /* 733 * tappoll 734 * 735 * the poll interface, this is only useful on reads 736 * really. the write detect always returns true, write never blocks 737 * anyway, it either accepts the packet or drops it 738 */ 739 static int 740 tappoll(struct dev_poll_args *ap) 741 { 742 dev_t dev = ap->a_head.a_dev; 743 struct tap_softc *tp = dev->si_drv1; 744 struct ifnet *ifp = &tp->tap_if; 745 int revents = 0; 746 747 TAPDEBUG(ifp, "polling, minor = %#x\n", minor(tp->tap_dev)); 748 749 lwkt_serialize_enter(ifp->if_serializer); 750 if (ap->a_events & (POLLIN | POLLRDNORM)) { 751 if (!ifq_is_empty(&ifp->if_snd)) { 752 TAPDEBUG(ifp, 753 "has data in queue. minor = %#x\n", 754 minor(tp->tap_dev)); 755 756 revents |= (ap->a_events & (POLLIN | POLLRDNORM)); 757 } 758 else { 759 TAPDEBUG(ifp, "waiting for data, minor = %#x\n", 760 minor(tp->tap_dev)); 761 762 selrecord(curthread, &tp->tap_rsel); 763 } 764 } 765 lwkt_serialize_exit(ifp->if_serializer); 766 767 if (ap->a_events & (POLLOUT | POLLWRNORM)) 768 revents |= (ap->a_events & (POLLOUT | POLLWRNORM)); 769 ap->a_events = revents; 770 return(0); 771 } /* tappoll */ 772