Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/net/if_tun.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /* $NetBSD: if_tun.c,v 1.14 1994/06/29 06:36:25 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk> 5 * Nottingham University 1987. 6 * 7 * This source may be freely distributed, however I would be interested 8 * in any changes that are made. 9 * 10 * This driver takes packets off the IP i/f and hands them up to a 11 * user process to have its wicked way with. This driver has it's 12 * roots in a similar driver written by Phil Cockcroft (formerly) at 13 * UCL. This driver is based much more on read/write/poll mode of 14 * operation though. 15 * 16 * $FreeBSD$ 17 */ 18 19 #include "opt_inet.h" 20 21 #include <sys/param.h> 22 #include <sys/proc.h> 23 #include <sys/systm.h> 24 #include <sys/mbuf.h> 25 #include <sys/socket.h> 26 #include <sys/filio.h> 27 #include <sys/sockio.h> 28 #include <sys/ttycom.h> 29 #include <sys/poll.h> 30 #include <sys/signalvar.h> 31 #include <sys/filedesc.h> 32 #include <sys/kernel.h> 33 #include <sys/sysctl.h> 34 #include <sys/conf.h> 35 #include <sys/uio.h> 36 #include <sys/vnode.h> 37 #include <sys/malloc.h> 38 39 #include <net/if.h> 40 #include <net/if_types.h> 41 #include <net/route.h> 42 #include <net/intrq.h> 43 44 #ifdef INET 45 #include <netinet/in.h> 46 #endif 47 48 #include <net/bpf.h> 49 50 #include <net/if_tunvar.h> 51 #include <net/if_tun.h> 52 53 static MALLOC_DEFINE(M_TUN, "tun", "Tunnel Interface"); 54 55 static void tunattach __P((void *)); 56 PSEUDO_SET(tunattach, if_tun); 57 58 static void tuncreate __P((dev_t dev)); 59 60 #define TUNDEBUG if (tundebug) printf 61 static int tundebug = 0; 62 SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, ""); 63 64 static int tunoutput __P((struct ifnet *, struct mbuf *, struct sockaddr *, 65 struct rtentry *rt)); 66 static int tunifioctl __P((struct ifnet *, u_long, caddr_t)); 67 static int tuninit __P((struct ifnet *)); 68 69 static d_open_t tunopen; 70 static d_close_t tunclose; 71 static d_read_t tunread; 72 static d_write_t tunwrite; 73 static d_ioctl_t tunioctl; 74 static d_poll_t tunpoll; 75 76 #define CDEV_MAJOR 52 77 static struct cdevsw tun_cdevsw = { 78 /* open */ tunopen, 79 /* close */ tunclose, 80 /* read */ tunread, 81 /* write */ tunwrite, 82 /* ioctl */ tunioctl, 83 /* poll */ tunpoll, 84 /* mmap */ nommap, 85 /* strategy */ nostrategy, 86 /* name */ "tun", 87 /* maj */ CDEV_MAJOR, 88 /* dump */ nodump, 89 /* psize */ nopsize, 90 /* flags */ 0, 91 /* bmaj */ -1 92 }; 93 94 static void 95 tunattach(dummy) 96 void *dummy; 97 { 98 99 cdevsw_add(&tun_cdevsw); 100 } 101 102 static void 103 tuncreate(dev) 104 dev_t dev; 105 { 106 struct tun_softc *sc; 107 struct ifnet *ifp; 108 109 dev = make_dev(&tun_cdevsw, minor(dev), 110 UID_UUCP, GID_DIALER, 0600, "tun%d", lminor(dev)); 111 112 MALLOC(sc, struct tun_softc *, sizeof(*sc), M_TUN, M_WAITOK); 113 bzero(sc, sizeof *sc); 114 sc->tun_flags = TUN_INITED; 115 116 ifp = &sc->tun_if; 117 ifp->if_unit = lminor(dev); 118 ifp->if_name = "tun"; 119 ifp->if_mtu = TUNMTU; 120 ifp->if_ioctl = tunifioctl; 121 ifp->if_output = tunoutput; 122 ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 123 ifp->if_type = IFT_PPP; 124 ifp->if_snd.ifq_maxlen = ifqmaxlen; 125 ifp->if_softc = sc; 126 if_attach(ifp); 127 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 128 dev->si_drv1 = sc; 129 } 130 131 /* 132 * tunnel open - must be superuser & the device must be 133 * configured in 134 */ 135 static int 136 tunopen(dev, flag, mode, p) 137 dev_t dev; 138 int flag, mode; 139 struct proc *p; 140 { 141 struct ifnet *ifp; 142 struct tun_softc *tp; 143 register int error; 144 145 error = suser(p); 146 if (error) 147 return (error); 148 149 tp = dev->si_drv1; 150 if (!tp) { 151 tuncreate(dev); 152 tp = dev->si_drv1; 153 } 154 if (tp->tun_flags & TUN_OPEN) 155 return EBUSY; 156 tp->tun_pid = p->p_pid; 157 ifp = &tp->tun_if; 158 tp->tun_flags |= TUN_OPEN; 159 TUNDEBUG("%s%d: open\n", ifp->if_name, ifp->if_unit); 160 return (0); 161 } 162 163 /* 164 * tunclose - close the device - mark i/f down & delete 165 * routing info 166 */ 167 static int 168 tunclose(dev, foo, bar, p) 169 dev_t dev; 170 int foo; 171 int bar; 172 struct proc *p; 173 { 174 register int s; 175 struct tun_softc *tp; 176 struct ifnet *ifp; 177 struct mbuf *m; 178 179 tp = dev->si_drv1; 180 ifp = &tp->tun_if; 181 182 tp->tun_flags &= ~TUN_OPEN; 183 tp->tun_pid = 0; 184 185 /* 186 * junk all pending output 187 */ 188 do { 189 s = splimp(); 190 IF_DEQUEUE(&ifp->if_snd, m); 191 splx(s); 192 if (m) 193 m_freem(m); 194 } while (m); 195 196 if (ifp->if_flags & IFF_UP) { 197 s = splimp(); 198 if_down(ifp); 199 splx(s); 200 } 201 202 if (ifp->if_flags & IFF_RUNNING) { 203 register struct ifaddr *ifa; 204 205 s = splimp(); 206 /* find internet addresses and delete routes */ 207 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 208 if (ifa->ifa_addr->sa_family == AF_INET) 209 rtinit(ifa, (int)RTM_DELETE, 210 tp->tun_flags & TUN_DSTADDR ? RTF_HOST : 0); 211 ifp->if_flags &= ~IFF_RUNNING; 212 splx(s); 213 } 214 215 funsetown(tp->tun_sigio); 216 selwakeup(&tp->tun_rsel); 217 218 TUNDEBUG ("%s%d: closed\n", ifp->if_name, ifp->if_unit); 219 return (0); 220 } 221 222 static int 223 tuninit(ifp) 224 struct ifnet *ifp; 225 { 226 struct tun_softc *tp = ifp->if_softc; 227 register struct ifaddr *ifa; 228 int error = 0; 229 230 TUNDEBUG("%s%d: tuninit\n", ifp->if_name, ifp->if_unit); 231 232 ifp->if_flags |= IFF_UP | IFF_RUNNING; 233 getmicrotime(&ifp->if_lastchange); 234 235 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 236 ifa = TAILQ_NEXT(ifa, ifa_link)) { 237 if (ifa->ifa_addr == NULL) 238 error = EFAULT; 239 /* XXX: Should maybe return straight off? */ 240 else { 241 #ifdef INET 242 if (ifa->ifa_addr->sa_family == AF_INET) { 243 struct sockaddr_in *si; 244 245 si = (struct sockaddr_in *)ifa->ifa_addr; 246 if (si->sin_addr.s_addr) 247 tp->tun_flags |= TUN_IASET; 248 249 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 250 if (si && si->sin_addr.s_addr) 251 tp->tun_flags |= TUN_DSTADDR; 252 } 253 #endif 254 } 255 } 256 return (error); 257 } 258 259 /* 260 * Process an ioctl request. 261 */ 262 int 263 tunifioctl(ifp, cmd, data) 264 struct ifnet *ifp; 265 u_long cmd; 266 caddr_t data; 267 { 268 struct ifreq *ifr = (struct ifreq *)data; 269 struct tun_softc *tp = ifp->if_softc; 270 struct ifstat *ifs; 271 int error = 0, s; 272 273 s = splimp(); 274 switch(cmd) { 275 case SIOCGIFSTATUS: 276 ifs = (struct ifstat *)data; 277 if (tp->tun_pid) 278 sprintf(ifs->ascii + strlen(ifs->ascii), 279 "\tOpened by PID %d\n", tp->tun_pid); 280 break; 281 case SIOCSIFADDR: 282 error = tuninit(ifp); 283 TUNDEBUG("%s%d: address set, error=%d\n", 284 ifp->if_name, ifp->if_unit, error); 285 break; 286 case SIOCSIFDSTADDR: 287 error = tuninit(ifp); 288 TUNDEBUG("%s%d: destination address set, error=%d\n", 289 ifp->if_name, ifp->if_unit, error); 290 break; 291 case SIOCSIFMTU: 292 ifp->if_mtu = ifr->ifr_mtu; 293 TUNDEBUG("%s%d: mtu set\n", 294 ifp->if_name, ifp->if_unit); 295 break; 296 case SIOCSIFFLAGS: 297 case SIOCADDMULTI: 298 case SIOCDELMULTI: 299 break; 300 default: 301 error = EINVAL; 302 } 303 splx(s); 304 return (error); 305 } 306 307 /* 308 * tunoutput - queue packets from higher level ready to put out. 309 */ 310 int 311 tunoutput(ifp, m0, dst, rt) 312 struct ifnet *ifp; 313 struct mbuf *m0; 314 struct sockaddr *dst; 315 struct rtentry *rt; 316 { 317 struct tun_softc *tp = ifp->if_softc; 318 int s; 319 320 TUNDEBUG ("%s%d: tunoutput\n", ifp->if_name, ifp->if_unit); 321 322 if ((tp->tun_flags & TUN_READY) != TUN_READY) { 323 TUNDEBUG ("%s%d: not ready 0%o\n", ifp->if_name, 324 ifp->if_unit, tp->tun_flags); 325 m_freem (m0); 326 return EHOSTDOWN; 327 } 328 329 /* BPF write needs to be handled specially */ 330 if (dst->sa_family == AF_UNSPEC) { 331 dst->sa_family = *(mtod(m0, int *)); 332 m0->m_len -= sizeof(int); 333 m0->m_pkthdr.len -= sizeof(int); 334 m0->m_data += sizeof(int); 335 } 336 337 if (ifp->if_bpf) { 338 /* 339 * We need to prepend the address family as 340 * a four byte field. Cons up a dummy header 341 * to pacify bpf. This is safe because bpf 342 * will only read from the mbuf (i.e., it won't 343 * try to free it or keep a pointer to it). 344 */ 345 struct mbuf m; 346 uint32_t af = dst->sa_family; 347 348 m.m_next = m0; 349 m.m_len = 4; 350 m.m_data = (char *)⁡ 351 352 bpf_mtap(ifp, &m); 353 } 354 355 /* prepend sockaddr? this may abort if the mbuf allocation fails */ 356 if (tp->tun_flags & TUN_LMODE) { 357 /* allocate space for sockaddr */ 358 M_PREPEND(m0, dst->sa_len, M_DONTWAIT); 359 360 /* if allocation failed drop packet */ 361 if (m0 == NULL){ 362 s = splimp(); /* spl on queue manipulation */ 363 IF_DROP(&ifp->if_snd); 364 splx(s); 365 ifp->if_oerrors++; 366 return (ENOBUFS); 367 } else { 368 bcopy(dst, m0->m_data, dst->sa_len); 369 } 370 } 371 372 if (tp->tun_flags & TUN_IFHEAD) { 373 /* Prepend the address family */ 374 M_PREPEND(m0, 4, M_DONTWAIT); 375 376 /* if allocation failed drop packet */ 377 if (m0 == NULL){ 378 s = splimp(); /* spl on queue manipulation */ 379 IF_DROP(&ifp->if_snd); 380 splx(s); 381 ifp->if_oerrors++; 382 return ENOBUFS; 383 } else 384 *(u_int32_t *)m0->m_data = htonl(dst->sa_family); 385 } else { 386 #ifdef INET 387 if (dst->sa_family != AF_INET) 388 #endif 389 { 390 m_freem(m0); 391 return EAFNOSUPPORT; 392 } 393 } 394 395 s = splimp(); 396 if (IF_QFULL(&ifp->if_snd)) { 397 IF_DROP(&ifp->if_snd); 398 m_freem(m0); 399 splx(s); 400 ifp->if_collisions++; 401 return ENOBUFS; 402 } 403 ifp->if_obytes += m0->m_pkthdr.len; 404 IF_ENQUEUE(&ifp->if_snd, m0); 405 splx(s); 406 ifp->if_opackets++; 407 408 if (tp->tun_flags & TUN_RWAIT) { 409 tp->tun_flags &= ~TUN_RWAIT; 410 wakeup((caddr_t)tp); 411 } 412 if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio) 413 pgsigio(tp->tun_sigio, SIGIO, 0); 414 selwakeup(&tp->tun_rsel); 415 return 0; 416 } 417 418 /* 419 * the cdevsw interface is now pretty minimal. 420 */ 421 static int 422 tunioctl(dev, cmd, data, flag, p) 423 dev_t dev; 424 u_long cmd; 425 caddr_t data; 426 int flag; 427 struct proc *p; 428 { 429 int s; 430 struct tun_softc *tp = dev->si_drv1; 431 struct tuninfo *tunp; 432 433 switch (cmd) { 434 case TUNSIFINFO: 435 tunp = (struct tuninfo *)data; 436 if (tunp->mtu < IF_MINMTU) 437 return (EINVAL); 438 tp->tun_if.if_mtu = tunp->mtu; 439 tp->tun_if.if_type = tunp->type; 440 tp->tun_if.if_baudrate = tunp->baudrate; 441 break; 442 case TUNGIFINFO: 443 tunp = (struct tuninfo *)data; 444 tunp->mtu = tp->tun_if.if_mtu; 445 tunp->type = tp->tun_if.if_type; 446 tunp->baudrate = tp->tun_if.if_baudrate; 447 break; 448 case TUNSDEBUG: 449 tundebug = *(int *)data; 450 break; 451 case TUNGDEBUG: 452 *(int *)data = tundebug; 453 break; 454 case TUNSLMODE: 455 if (*(int *)data) { 456 tp->tun_flags |= TUN_LMODE; 457 tp->tun_flags &= ~TUN_IFHEAD; 458 } else 459 tp->tun_flags &= ~TUN_LMODE; 460 break; 461 case TUNSIFHEAD: 462 if (*(int *)data) { 463 tp->tun_flags |= TUN_IFHEAD; 464 tp->tun_flags &= ~TUN_LMODE; 465 } else 466 tp->tun_flags &= ~TUN_IFHEAD; 467 break; 468 case TUNGIFHEAD: 469 *(int *)data = (tp->tun_flags & TUN_IFHEAD) ? 1 : 0; 470 break; 471 case TUNSIFMODE: 472 /* deny this if UP */ 473 if (tp->tun_if.if_flags & IFF_UP) 474 return(EBUSY); 475 476 switch (*(int *)data & ~IFF_MULTICAST) { 477 case IFF_POINTOPOINT: 478 case IFF_BROADCAST: 479 tp->tun_if.if_flags &= ~(IFF_BROADCAST|IFF_POINTOPOINT); 480 tp->tun_if.if_flags |= *(int *)data; 481 break; 482 default: 483 return(EINVAL); 484 } 485 break; 486 case TUNSIFPID: 487 tp->tun_pid = curproc->p_pid; 488 break; 489 case FIONBIO: 490 break; 491 case FIOASYNC: 492 if (*(int *)data) 493 tp->tun_flags |= TUN_ASYNC; 494 else 495 tp->tun_flags &= ~TUN_ASYNC; 496 break; 497 case FIONREAD: 498 s = splimp(); 499 if (tp->tun_if.if_snd.ifq_head) { 500 struct mbuf *mb = tp->tun_if.if_snd.ifq_head; 501 for( *(int *)data = 0; mb != 0; mb = mb->m_next) 502 *(int *)data += mb->m_len; 503 } else 504 *(int *)data = 0; 505 splx(s); 506 break; 507 case FIOSETOWN: 508 return (fsetown(*(int *)data, &tp->tun_sigio)); 509 510 case FIOGETOWN: 511 *(int *)data = fgetown(tp->tun_sigio); 512 return (0); 513 514 /* This is deprecated, FIOSETOWN should be used instead. */ 515 case TIOCSPGRP: 516 return (fsetown(-(*(int *)data), &tp->tun_sigio)); 517 518 /* This is deprecated, FIOGETOWN should be used instead. */ 519 case TIOCGPGRP: 520 *(int *)data = -fgetown(tp->tun_sigio); 521 return (0); 522 523 default: 524 return (ENOTTY); 525 } 526 return (0); 527 } 528 529 /* 530 * The cdevsw read interface - reads a packet at a time, or at 531 * least as much of a packet as can be read. 532 */ 533 static int 534 tunread(dev, uio, flag) 535 dev_t dev; 536 struct uio *uio; 537 int flag; 538 { 539 struct tun_softc *tp = dev->si_drv1; 540 struct ifnet *ifp = &tp->tun_if; 541 struct mbuf *m0; 542 int error=0, len, s; 543 544 TUNDEBUG ("%s%d: read\n", ifp->if_name, ifp->if_unit); 545 if ((tp->tun_flags & TUN_READY) != TUN_READY) { 546 TUNDEBUG ("%s%d: not ready 0%o\n", ifp->if_name, 547 ifp->if_unit, tp->tun_flags); 548 return EHOSTDOWN; 549 } 550 551 tp->tun_flags &= ~TUN_RWAIT; 552 553 s = splimp(); 554 do { 555 IF_DEQUEUE(&ifp->if_snd, m0); 556 if (m0 == 0) { 557 if (flag & IO_NDELAY) { 558 splx(s); 559 return EWOULDBLOCK; 560 } 561 tp->tun_flags |= TUN_RWAIT; 562 if((error = tsleep((caddr_t)tp, PCATCH | (PZERO + 1), 563 "tunread", 0)) != 0) { 564 splx(s); 565 return error; 566 } 567 } 568 } while (m0 == 0); 569 splx(s); 570 571 while (m0 && uio->uio_resid > 0 && error == 0) { 572 len = min(uio->uio_resid, m0->m_len); 573 if (len != 0) 574 error = uiomove(mtod(m0, caddr_t), len, uio); 575 m0 = m_free(m0); 576 } 577 578 if (m0) { 579 TUNDEBUG("%s%d: Dropping mbuf\n", ifp->if_name, ifp->if_unit); 580 m_freem(m0); 581 } 582 return error; 583 } 584 585 /* 586 * the cdevsw write interface - an atomic write is a packet - or else! 587 */ 588 static int 589 tunwrite(dev, uio, flag) 590 dev_t dev; 591 struct uio *uio; 592 int flag; 593 { 594 struct tun_softc *tp = dev->si_drv1; 595 struct ifnet *ifp = &tp->tun_if; 596 struct mbuf *top, **mp, *m; 597 int error=0, tlen, mlen; 598 uint32_t family; 599 600 TUNDEBUG("%s%d: tunwrite\n", ifp->if_name, ifp->if_unit); 601 602 if (uio->uio_resid == 0) 603 return 0; 604 605 if (uio->uio_resid < 0 || uio->uio_resid > TUNMRU) { 606 TUNDEBUG("%s%d: len=%d!\n", ifp->if_name, ifp->if_unit, 607 uio->uio_resid); 608 return EIO; 609 } 610 tlen = uio->uio_resid; 611 612 /* get a header mbuf */ 613 MGETHDR(m, M_DONTWAIT, MT_DATA); 614 if (m == NULL) 615 return ENOBUFS; 616 mlen = MHLEN; 617 618 top = 0; 619 mp = ⊤ 620 while (error == 0 && uio->uio_resid > 0) { 621 m->m_len = min(mlen, uio->uio_resid); 622 error = uiomove(mtod (m, caddr_t), m->m_len, uio); 623 *mp = m; 624 mp = &m->m_next; 625 if (uio->uio_resid > 0) { 626 MGET (m, M_DONTWAIT, MT_DATA); 627 if (m == 0) { 628 error = ENOBUFS; 629 break; 630 } 631 mlen = MLEN; 632 } 633 } 634 if (error) { 635 if (top) 636 m_freem (top); 637 ifp->if_ierrors++; 638 return error; 639 } 640 641 top->m_pkthdr.len = tlen; 642 top->m_pkthdr.rcvif = ifp; 643 644 if (ifp->if_bpf) { 645 if (tp->tun_flags & TUN_IFHEAD) { 646 /* 647 * Conveniently, we already have a 4-byte address 648 * family prepended to our packet ! 649 * Inconveniently, it's in the wrong byte order ! 650 */ 651 if ((top = m_pullup(top, sizeof(family))) == NULL) 652 return ENOBUFS; 653 *mtod(top, u_int32_t *) = 654 ntohl(*mtod(top, u_int32_t *)); 655 bpf_mtap(ifp, top); 656 *mtod(top, u_int32_t *) = 657 htonl(*mtod(top, u_int32_t *)); 658 } else { 659 /* 660 * We need to prepend the address family as 661 * a four byte field. Cons up a dummy header 662 * to pacify bpf. This is safe because bpf 663 * will only read from the mbuf (i.e., it won't 664 * try to free it or keep a pointer to it). 665 */ 666 struct mbuf m; 667 uint32_t af = AF_INET; 668 669 m.m_next = top; 670 m.m_len = 4; 671 m.m_data = (char *)⁡ 672 673 bpf_mtap(ifp, &m); 674 } 675 } 676 677 if (tp->tun_flags & TUN_IFHEAD) { 678 if (top->m_len < sizeof(family) && 679 (top = m_pullup(top, sizeof(family))) == NULL) 680 return ENOBUFS; 681 family = ntohl(*mtod(top, u_int32_t *)); 682 m_adj(top, sizeof(family)); 683 } else 684 family = AF_INET; 685 686 ifp->if_ibytes += top->m_pkthdr.len; 687 ifp->if_ipackets++; 688 689 return family_enqueue(family, top); 690 } 691 692 /* 693 * tunpoll - the poll interface, this is only useful on reads 694 * really. The write detect always returns true, write never blocks 695 * anyway, it either accepts the packet or drops it. 696 */ 697 static int 698 tunpoll(dev, events, p) 699 dev_t dev; 700 int events; 701 struct proc *p; 702 { 703 int s; 704 struct tun_softc *tp = dev->si_drv1; 705 struct ifnet *ifp = &tp->tun_if; 706 int revents = 0; 707 708 s = splimp(); 709 TUNDEBUG("%s%d: tunpoll\n", ifp->if_name, ifp->if_unit); 710 711 if (events & (POLLIN | POLLRDNORM)) { 712 if (ifp->if_snd.ifq_len > 0) { 713 TUNDEBUG("%s%d: tunpoll q=%d\n", ifp->if_name, 714 ifp->if_unit, ifp->if_snd.ifq_len); 715 revents |= events & (POLLIN | POLLRDNORM); 716 } else { 717 TUNDEBUG("%s%d: tunpoll waiting\n", ifp->if_name, 718 ifp->if_unit); 719 selrecord(p, &tp->tun_rsel); 720 } 721 } 722 if (events & (POLLOUT | POLLWRNORM)) 723 revents |= events & (POLLOUT | POLLWRNORM); 724 725 splx(s); 726 return (revents); 727 }
Cache object: f6e8f061abf73737b3e5cf48a71e5006
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]