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: releng/6.2/sys/net/if_tun.c 161441 2006-08-18 14:05:17Z rwatson $ 17 */ 18 19 #include "opt_atalk.h" 20 #include "opt_inet.h" 21 #include "opt_inet6.h" 22 #include "opt_ipx.h" 23 #include "opt_mac.h" 24 25 #include <sys/param.h> 26 #include <sys/proc.h> 27 #include <sys/systm.h> 28 #include <sys/mac.h> 29 #include <sys/mbuf.h> 30 #include <sys/module.h> 31 #include <sys/socket.h> 32 #include <sys/fcntl.h> 33 #include <sys/filio.h> 34 #include <sys/sockio.h> 35 #include <sys/ttycom.h> 36 #include <sys/poll.h> 37 #include <sys/selinfo.h> 38 #include <sys/signalvar.h> 39 #include <sys/filedesc.h> 40 #include <sys/kernel.h> 41 #include <sys/sysctl.h> 42 #include <sys/conf.h> 43 #include <sys/uio.h> 44 #include <sys/malloc.h> 45 #include <sys/random.h> 46 47 #include <net/if.h> 48 #include <net/if_types.h> 49 #include <net/netisr.h> 50 #include <net/route.h> 51 #ifdef INET 52 #include <netinet/in.h> 53 #endif 54 #include <net/bpf.h> 55 #include <net/if_tun.h> 56 57 #include <sys/queue.h> 58 59 /* 60 * tun_list is protected by global tunmtx. Other mutable fields are 61 * protected by tun->tun_mtx, or by their owning subsystem. tun_dev is 62 * static for the duration of a tunnel interface. 63 */ 64 struct tun_softc { 65 TAILQ_ENTRY(tun_softc) tun_list; 66 struct cdev *tun_dev; 67 u_short tun_flags; /* misc flags */ 68 #define TUN_OPEN 0x0001 69 #define TUN_INITED 0x0002 70 #define TUN_RCOLL 0x0004 71 #define TUN_IASET 0x0008 72 #define TUN_DSTADDR 0x0010 73 #define TUN_LMODE 0x0020 74 #define TUN_RWAIT 0x0040 75 #define TUN_ASYNC 0x0080 76 #define TUN_IFHEAD 0x0100 77 78 #define TUN_READY (TUN_OPEN | TUN_INITED) 79 80 /* 81 * XXXRW: tun_pid is used to exclusively lock /dev/tun. Is this 82 * actually needed? Can we just return EBUSY if already open? 83 * Problem is that this involved inherent races when a tun device 84 * is handed off from one process to another, as opposed to just 85 * being slightly stale informationally. 86 */ 87 pid_t tun_pid; /* owning pid */ 88 struct ifnet *tun_ifp; /* the interface */ 89 struct sigio *tun_sigio; /* information for async I/O */ 90 struct selinfo tun_rsel; /* read select */ 91 struct mtx tun_mtx; /* protect mutable softc fields */ 92 }; 93 #define TUN2IFP(sc) ((sc)->tun_ifp) 94 95 #define TUNDEBUG if (tundebug) if_printf 96 #define TUNNAME "tun" 97 98 /* 99 * All mutable global variables in if_tun are locked using tunmtx, with 100 * the exception of tundebug, which is used unlocked, and tunclones, 101 * which is static after setup. 102 */ 103 static struct mtx tunmtx; 104 static MALLOC_DEFINE(M_TUN, TUNNAME, "Tunnel Interface"); 105 static int tundebug = 0; 106 static struct clonedevs *tunclones; 107 static TAILQ_HEAD(,tun_softc) tunhead = TAILQ_HEAD_INITIALIZER(tunhead); 108 SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, ""); 109 110 static void tunclone(void *arg, struct ucred *cred, char *name, 111 int namelen, struct cdev **dev); 112 static void tuncreate(struct cdev *dev); 113 static int tunifioctl(struct ifnet *, u_long, caddr_t); 114 static int tuninit(struct ifnet *); 115 static int tunmodevent(module_t, int, void *); 116 static int tunoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 117 struct rtentry *rt); 118 static void tunstart(struct ifnet *); 119 120 static d_open_t tunopen; 121 static d_close_t tunclose; 122 static d_read_t tunread; 123 static d_write_t tunwrite; 124 static d_ioctl_t tunioctl; 125 static d_poll_t tunpoll; 126 static d_kqfilter_t tunkqfilter; 127 128 static int tunkqread(struct knote *, long); 129 static int tunkqwrite(struct knote *, long); 130 static void tunkqdetach(struct knote *); 131 132 static struct filterops tun_read_filterops = { 133 .f_isfd = 1, 134 .f_attach = NULL, 135 .f_detach = tunkqdetach, 136 .f_event = tunkqread, 137 }; 138 139 static struct filterops tun_write_filterops = { 140 .f_isfd = 1, 141 .f_attach = NULL, 142 .f_detach = tunkqdetach, 143 .f_event = tunkqwrite, 144 }; 145 146 static struct cdevsw tun_cdevsw = { 147 .d_version = D_VERSION, 148 .d_flags = D_PSEUDO | D_NEEDGIANT, 149 .d_open = tunopen, 150 .d_close = tunclose, 151 .d_read = tunread, 152 .d_write = tunwrite, 153 .d_ioctl = tunioctl, 154 .d_poll = tunpoll, 155 .d_kqfilter = tunkqfilter, 156 .d_name = TUNNAME, 157 }; 158 159 static void 160 tunclone(void *arg, struct ucred *cred, char *name, int namelen, 161 struct cdev **dev) 162 { 163 int u, i; 164 165 if (*dev != NULL) 166 return; 167 168 if (strcmp(name, TUNNAME) == 0) { 169 u = -1; 170 } else if (dev_stdclone(name, NULL, TUNNAME, &u) != 1) 171 return; /* Don't recognise the name */ 172 if (u != -1 && u > IF_MAXUNIT) 173 return; /* Unit number too high */ 174 175 /* find any existing device, or allocate new unit number */ 176 i = clone_create(&tunclones, &tun_cdevsw, &u, dev, 0); 177 if (i) { 178 /* No preexisting struct cdev *, create one */ 179 *dev = make_dev(&tun_cdevsw, unit2minor(u), 180 UID_UUCP, GID_DIALER, 0600, "tun%d", u); 181 if (*dev != NULL) { 182 dev_ref(*dev); 183 (*dev)->si_flags |= SI_CHEAPCLONE; 184 } 185 } 186 } 187 188 static void 189 tun_destroy(struct tun_softc *tp) 190 { 191 struct cdev *dev; 192 193 /* Unlocked read. */ 194 KASSERT((tp->tun_flags & TUN_OPEN) == 0, 195 ("tununits is out of sync - unit %d", TUN2IFP(tp)->if_dunit)); 196 197 dev = tp->tun_dev; 198 bpfdetach(TUN2IFP(tp)); 199 if_detach(TUN2IFP(tp)); 200 if_free(TUN2IFP(tp)); 201 destroy_dev(dev); 202 knlist_destroy(&tp->tun_rsel.si_note); 203 mtx_destroy(&tp->tun_mtx); 204 free(tp, M_TUN); 205 } 206 207 static int 208 tunmodevent(module_t mod, int type, void *data) 209 { 210 static eventhandler_tag tag; 211 struct tun_softc *tp; 212 213 switch (type) { 214 case MOD_LOAD: 215 mtx_init(&tunmtx, "tunmtx", NULL, MTX_DEF); 216 clone_setup(&tunclones); 217 tag = EVENTHANDLER_REGISTER(dev_clone, tunclone, 0, 1000); 218 if (tag == NULL) 219 return (ENOMEM); 220 break; 221 case MOD_UNLOAD: 222 EVENTHANDLER_DEREGISTER(dev_clone, tag); 223 224 mtx_lock(&tunmtx); 225 while ((tp = TAILQ_FIRST(&tunhead)) != NULL) { 226 TAILQ_REMOVE(&tunhead, tp, tun_list); 227 mtx_unlock(&tunmtx); 228 tun_destroy(tp); 229 mtx_lock(&tunmtx); 230 } 231 mtx_unlock(&tunmtx); 232 clone_cleanup(&tunclones); 233 mtx_destroy(&tunmtx); 234 break; 235 default: 236 return EOPNOTSUPP; 237 } 238 return 0; 239 } 240 241 static moduledata_t tun_mod = { 242 "if_tun", 243 tunmodevent, 244 0 245 }; 246 247 DECLARE_MODULE(if_tun, tun_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 248 249 static void 250 tunstart(struct ifnet *ifp) 251 { 252 struct tun_softc *tp = ifp->if_softc; 253 struct mbuf *m; 254 255 TUNDEBUG(ifp,"%s starting\n", ifp->if_xname); 256 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 257 IFQ_LOCK(&ifp->if_snd); 258 IFQ_POLL_NOLOCK(&ifp->if_snd, m); 259 if (m == NULL) { 260 IFQ_UNLOCK(&ifp->if_snd); 261 return; 262 } 263 IFQ_UNLOCK(&ifp->if_snd); 264 } 265 266 mtx_lock(&tp->tun_mtx); 267 if (tp->tun_flags & TUN_RWAIT) { 268 tp->tun_flags &= ~TUN_RWAIT; 269 wakeup(tp); 270 } 271 if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio) { 272 mtx_unlock(&tp->tun_mtx); 273 pgsigio(&tp->tun_sigio, SIGIO, 0); 274 } else 275 mtx_unlock(&tp->tun_mtx); 276 selwakeuppri(&tp->tun_rsel, PZERO + 1); 277 KNOTE_UNLOCKED(&tp->tun_rsel.si_note, 0); 278 } 279 280 /* XXX: should return an error code so it can fail. */ 281 static void 282 tuncreate(struct cdev *dev) 283 { 284 struct tun_softc *sc; 285 struct ifnet *ifp; 286 287 dev->si_flags &= ~SI_CHEAPCLONE; 288 289 MALLOC(sc, struct tun_softc *, sizeof(*sc), M_TUN, M_WAITOK | M_ZERO); 290 mtx_init(&sc->tun_mtx, "tun_mtx", NULL, MTX_DEF); 291 sc->tun_flags = TUN_INITED; 292 sc->tun_dev = dev; 293 mtx_lock(&tunmtx); 294 TAILQ_INSERT_TAIL(&tunhead, sc, tun_list); 295 mtx_unlock(&tunmtx); 296 297 ifp = sc->tun_ifp = if_alloc(IFT_PPP); 298 if (ifp == NULL) 299 panic("%s%d: failed to if_alloc() interface.\n", 300 TUNNAME, dev2unit(dev)); 301 if_initname(ifp, TUNNAME, dev2unit(dev)); 302 ifp->if_mtu = TUNMTU; 303 ifp->if_ioctl = tunifioctl; 304 ifp->if_output = tunoutput; 305 ifp->if_start = tunstart; 306 ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 307 ifp->if_softc = sc; 308 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 309 ifp->if_snd.ifq_drv_maxlen = 0; 310 IFQ_SET_READY(&ifp->if_snd); 311 knlist_init(&sc->tun_rsel.si_note, NULL, NULL, NULL, NULL); 312 313 if_attach(ifp); 314 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 315 dev->si_drv1 = sc; 316 TUNDEBUG(ifp, "interface %s is created, minor = %#x\n", 317 ifp->if_xname, minor(dev)); 318 } 319 320 static int 321 tunopen(struct cdev *dev, int flag, int mode, struct thread *td) 322 { 323 struct ifnet *ifp; 324 struct tun_softc *tp; 325 326 /* 327 * XXXRW: Non-atomic test and set of dev->si_drv1 requires 328 * synchronization. 329 */ 330 tp = dev->si_drv1; 331 if (!tp) { 332 tuncreate(dev); 333 tp = dev->si_drv1; 334 } 335 336 /* 337 * XXXRW: This use of tun_pid is subject to error due to the 338 * fact that a reference to the tunnel can live beyond the 339 * death of the process that created it. Can we replace this 340 * with a simple busy flag? 341 */ 342 mtx_lock(&tp->tun_mtx); 343 if (tp->tun_pid != 0 && tp->tun_pid != td->td_proc->p_pid) { 344 mtx_unlock(&tp->tun_mtx); 345 return (EBUSY); 346 } 347 tp->tun_pid = td->td_proc->p_pid; 348 349 tp->tun_flags |= TUN_OPEN; 350 mtx_unlock(&tp->tun_mtx); 351 ifp = TUN2IFP(tp); 352 TUNDEBUG(ifp, "open\n"); 353 354 return (0); 355 } 356 357 /* 358 * tunclose - close the device - mark i/f down & delete 359 * routing info 360 */ 361 static int 362 tunclose(struct cdev *dev, int foo, int bar, struct thread *td) 363 { 364 struct tun_softc *tp; 365 struct ifnet *ifp; 366 int s; 367 368 tp = dev->si_drv1; 369 ifp = TUN2IFP(tp); 370 371 mtx_lock(&tp->tun_mtx); 372 tp->tun_flags &= ~TUN_OPEN; 373 tp->tun_pid = 0; 374 375 /* 376 * junk all pending output 377 */ 378 s = splimp(); 379 IFQ_PURGE(&ifp->if_snd); 380 splx(s); 381 mtx_unlock(&tp->tun_mtx); 382 383 if (ifp->if_flags & IFF_UP) { 384 s = splimp(); 385 if_down(ifp); 386 splx(s); 387 } 388 389 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 390 struct ifaddr *ifa; 391 392 s = splimp(); 393 /* find internet addresses and delete routes */ 394 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 395 if (ifa->ifa_addr->sa_family == AF_INET) 396 /* Unlocked read. */ 397 rtinit(ifa, (int)RTM_DELETE, 398 tp->tun_flags & TUN_DSTADDR ? RTF_HOST : 0); 399 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 400 splx(s); 401 } 402 403 funsetown(&tp->tun_sigio); 404 selwakeuppri(&tp->tun_rsel, PZERO + 1); 405 KNOTE_UNLOCKED(&tp->tun_rsel.si_note, 0); 406 TUNDEBUG (ifp, "closed\n"); 407 return (0); 408 } 409 410 static int 411 tuninit(struct ifnet *ifp) 412 { 413 struct tun_softc *tp = ifp->if_softc; 414 struct ifaddr *ifa; 415 int error = 0; 416 417 TUNDEBUG(ifp, "tuninit\n"); 418 419 ifp->if_flags |= IFF_UP; 420 ifp->if_drv_flags |= IFF_DRV_RUNNING; 421 getmicrotime(&ifp->if_lastchange); 422 423 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 424 ifa = TAILQ_NEXT(ifa, ifa_link)) { 425 if (ifa->ifa_addr == NULL) 426 error = EFAULT; 427 /* XXX: Should maybe return straight off? */ 428 else { 429 #ifdef INET 430 if (ifa->ifa_addr->sa_family == AF_INET) { 431 struct sockaddr_in *si; 432 433 si = (struct sockaddr_in *)ifa->ifa_addr; 434 mtx_lock(&tp->tun_mtx); 435 if (si->sin_addr.s_addr) 436 tp->tun_flags |= TUN_IASET; 437 438 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 439 if (si && si->sin_addr.s_addr) 440 tp->tun_flags |= TUN_DSTADDR; 441 mtx_unlock(&tp->tun_mtx); 442 } 443 #endif 444 } 445 } 446 return (error); 447 } 448 449 /* 450 * Process an ioctl request. 451 */ 452 static int 453 tunifioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 454 { 455 struct ifreq *ifr = (struct ifreq *)data; 456 struct tun_softc *tp = ifp->if_softc; 457 struct ifstat *ifs; 458 int error = 0, s; 459 460 s = splimp(); 461 switch(cmd) { 462 case SIOCGIFSTATUS: 463 ifs = (struct ifstat *)data; 464 mtx_lock(&tp->tun_mtx); 465 if (tp->tun_pid) 466 sprintf(ifs->ascii + strlen(ifs->ascii), 467 "\tOpened by PID %d\n", tp->tun_pid); 468 mtx_unlock(&tp->tun_mtx); 469 break; 470 case SIOCSIFADDR: 471 error = tuninit(ifp); 472 TUNDEBUG(ifp, "address set, error=%d\n", error); 473 break; 474 case SIOCSIFDSTADDR: 475 error = tuninit(ifp); 476 TUNDEBUG(ifp, "destination address set, error=%d\n", error); 477 break; 478 case SIOCSIFMTU: 479 ifp->if_mtu = ifr->ifr_mtu; 480 TUNDEBUG(ifp, "mtu set\n"); 481 break; 482 case SIOCSIFFLAGS: 483 case SIOCADDMULTI: 484 case SIOCDELMULTI: 485 break; 486 default: 487 error = EINVAL; 488 } 489 splx(s); 490 return (error); 491 } 492 493 /* 494 * tunoutput - queue packets from higher level ready to put out. 495 */ 496 static int 497 tunoutput( 498 struct ifnet *ifp, 499 struct mbuf *m0, 500 struct sockaddr *dst, 501 struct rtentry *rt) 502 { 503 struct tun_softc *tp = ifp->if_softc; 504 u_short cached_tun_flags; 505 int error; 506 u_int32_t af; 507 508 TUNDEBUG (ifp, "tunoutput\n"); 509 510 #ifdef MAC 511 error = mac_check_ifnet_transmit(ifp, m0); 512 if (error) { 513 m_freem(m0); 514 return (error); 515 } 516 #endif 517 518 /* Could be unlocked read? */ 519 mtx_lock(&tp->tun_mtx); 520 cached_tun_flags = tp->tun_flags; 521 mtx_unlock(&tp->tun_mtx); 522 if ((cached_tun_flags & TUN_READY) != TUN_READY) { 523 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 524 m_freem (m0); 525 return (EHOSTDOWN); 526 } 527 528 if ((ifp->if_flags & IFF_UP) != IFF_UP) { 529 m_freem (m0); 530 return (EHOSTDOWN); 531 } 532 533 /* BPF writes need to be handled specially. */ 534 if (dst->sa_family == AF_UNSPEC) { 535 bcopy(dst->sa_data, &af, sizeof(af)); 536 dst->sa_family = af; 537 } 538 539 if (ifp->if_bpf) { 540 af = dst->sa_family; 541 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m0); 542 } 543 544 /* prepend sockaddr? this may abort if the mbuf allocation fails */ 545 if (cached_tun_flags & TUN_LMODE) { 546 /* allocate space for sockaddr */ 547 M_PREPEND(m0, dst->sa_len, M_DONTWAIT); 548 549 /* if allocation failed drop packet */ 550 if (m0 == NULL) { 551 ifp->if_iqdrops++; 552 ifp->if_oerrors++; 553 return (ENOBUFS); 554 } else { 555 bcopy(dst, m0->m_data, dst->sa_len); 556 } 557 } 558 559 if (cached_tun_flags & TUN_IFHEAD) { 560 /* Prepend the address family */ 561 M_PREPEND(m0, 4, M_DONTWAIT); 562 563 /* if allocation failed drop packet */ 564 if (m0 == NULL) { 565 ifp->if_iqdrops++; 566 ifp->if_oerrors++; 567 return (ENOBUFS); 568 } else 569 *(u_int32_t *)m0->m_data = htonl(dst->sa_family); 570 } else { 571 #ifdef INET 572 if (dst->sa_family != AF_INET) 573 #endif 574 { 575 m_freem(m0); 576 return (EAFNOSUPPORT); 577 } 578 } 579 580 IFQ_HANDOFF(ifp, m0, error); 581 if (error) { 582 ifp->if_collisions++; 583 return (ENOBUFS); 584 } 585 ifp->if_opackets++; 586 return (0); 587 } 588 589 /* 590 * the cdevsw interface is now pretty minimal. 591 */ 592 static int 593 tunioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 594 { 595 int s; 596 int error; 597 struct tun_softc *tp = dev->si_drv1; 598 struct tuninfo *tunp; 599 600 switch (cmd) { 601 case TUNSIFINFO: 602 tunp = (struct tuninfo *)data; 603 if (tunp->mtu < IF_MINMTU) 604 return (EINVAL); 605 if (TUN2IFP(tp)->if_mtu != tunp->mtu 606 && (error = suser(td)) != 0) 607 return (error); 608 TUN2IFP(tp)->if_mtu = tunp->mtu; 609 TUN2IFP(tp)->if_type = tunp->type; 610 TUN2IFP(tp)->if_baudrate = tunp->baudrate; 611 break; 612 case TUNGIFINFO: 613 tunp = (struct tuninfo *)data; 614 tunp->mtu = TUN2IFP(tp)->if_mtu; 615 tunp->type = TUN2IFP(tp)->if_type; 616 tunp->baudrate = TUN2IFP(tp)->if_baudrate; 617 break; 618 case TUNSDEBUG: 619 tundebug = *(int *)data; 620 break; 621 case TUNGDEBUG: 622 *(int *)data = tundebug; 623 break; 624 case TUNSLMODE: 625 mtx_lock(&tp->tun_mtx); 626 if (*(int *)data) { 627 tp->tun_flags |= TUN_LMODE; 628 tp->tun_flags &= ~TUN_IFHEAD; 629 } else 630 tp->tun_flags &= ~TUN_LMODE; 631 mtx_unlock(&tp->tun_mtx); 632 break; 633 case TUNSIFHEAD: 634 mtx_lock(&tp->tun_mtx); 635 if (*(int *)data) { 636 tp->tun_flags |= TUN_IFHEAD; 637 tp->tun_flags &= ~TUN_LMODE; 638 } else 639 tp->tun_flags &= ~TUN_IFHEAD; 640 mtx_unlock(&tp->tun_mtx); 641 break; 642 case TUNGIFHEAD: 643 /* Could be unlocked read? */ 644 mtx_lock(&tp->tun_mtx); 645 *(int *)data = (tp->tun_flags & TUN_IFHEAD) ? 1 : 0; 646 mtx_unlock(&tp->tun_mtx); 647 break; 648 case TUNSIFMODE: 649 /* deny this if UP */ 650 if (TUN2IFP(tp)->if_flags & IFF_UP) 651 return(EBUSY); 652 653 switch (*(int *)data & ~IFF_MULTICAST) { 654 case IFF_POINTOPOINT: 655 case IFF_BROADCAST: 656 TUN2IFP(tp)->if_flags &= 657 ~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST); 658 TUN2IFP(tp)->if_flags |= *(int *)data; 659 break; 660 default: 661 return(EINVAL); 662 } 663 break; 664 case TUNSIFPID: 665 mtx_lock(&tp->tun_mtx); 666 tp->tun_pid = curthread->td_proc->p_pid; 667 mtx_unlock(&tp->tun_mtx); 668 break; 669 case FIONBIO: 670 break; 671 case FIOASYNC: 672 mtx_lock(&tp->tun_mtx); 673 if (*(int *)data) 674 tp->tun_flags |= TUN_ASYNC; 675 else 676 tp->tun_flags &= ~TUN_ASYNC; 677 mtx_unlock(&tp->tun_mtx); 678 break; 679 case FIONREAD: 680 s = splimp(); 681 if (!IFQ_IS_EMPTY(&TUN2IFP(tp)->if_snd)) { 682 struct mbuf *mb; 683 IFQ_LOCK(&TUN2IFP(tp)->if_snd); 684 IFQ_POLL_NOLOCK(&TUN2IFP(tp)->if_snd, mb); 685 for( *(int *)data = 0; mb != 0; mb = mb->m_next) 686 *(int *)data += mb->m_len; 687 IFQ_UNLOCK(&TUN2IFP(tp)->if_snd); 688 } else 689 *(int *)data = 0; 690 splx(s); 691 break; 692 case FIOSETOWN: 693 return (fsetown(*(int *)data, &tp->tun_sigio)); 694 695 case FIOGETOWN: 696 *(int *)data = fgetown(&tp->tun_sigio); 697 return (0); 698 699 /* This is deprecated, FIOSETOWN should be used instead. */ 700 case TIOCSPGRP: 701 return (fsetown(-(*(int *)data), &tp->tun_sigio)); 702 703 /* This is deprecated, FIOGETOWN should be used instead. */ 704 case TIOCGPGRP: 705 *(int *)data = -fgetown(&tp->tun_sigio); 706 return (0); 707 708 default: 709 return (ENOTTY); 710 } 711 return (0); 712 } 713 714 /* 715 * The cdevsw read interface - reads a packet at a time, or at 716 * least as much of a packet as can be read. 717 */ 718 static int 719 tunread(struct cdev *dev, struct uio *uio, int flag) 720 { 721 struct tun_softc *tp = dev->si_drv1; 722 struct ifnet *ifp = TUN2IFP(tp); 723 struct mbuf *m; 724 int error=0, len, s; 725 726 TUNDEBUG (ifp, "read\n"); 727 mtx_lock(&tp->tun_mtx); 728 if ((tp->tun_flags & TUN_READY) != TUN_READY) { 729 mtx_unlock(&tp->tun_mtx); 730 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 731 return (EHOSTDOWN); 732 } 733 734 tp->tun_flags &= ~TUN_RWAIT; 735 mtx_unlock(&tp->tun_mtx); 736 737 s = splimp(); 738 do { 739 IFQ_DEQUEUE(&ifp->if_snd, m); 740 if (m == NULL) { 741 if (flag & O_NONBLOCK) { 742 splx(s); 743 return (EWOULDBLOCK); 744 } 745 mtx_lock(&tp->tun_mtx); 746 tp->tun_flags |= TUN_RWAIT; 747 mtx_unlock(&tp->tun_mtx); 748 if ((error = tsleep(tp, PCATCH | (PZERO + 1), 749 "tunread", 0)) != 0) { 750 splx(s); 751 return (error); 752 } 753 } 754 } while (m == NULL); 755 splx(s); 756 757 while (m && uio->uio_resid > 0 && error == 0) { 758 len = min(uio->uio_resid, m->m_len); 759 if (len != 0) 760 error = uiomove(mtod(m, void *), len, uio); 761 m = m_free(m); 762 } 763 764 if (m) { 765 TUNDEBUG(ifp, "Dropping mbuf\n"); 766 m_freem(m); 767 } 768 return (error); 769 } 770 771 /* 772 * the cdevsw write interface - an atomic write is a packet - or else! 773 */ 774 static int 775 tunwrite(struct cdev *dev, struct uio *uio, int flag) 776 { 777 struct tun_softc *tp = dev->si_drv1; 778 struct ifnet *ifp = TUN2IFP(tp); 779 struct mbuf *m; 780 int error = 0; 781 uint32_t family; 782 int isr; 783 784 TUNDEBUG(ifp, "tunwrite\n"); 785 786 if ((ifp->if_flags & IFF_UP) != IFF_UP) 787 /* ignore silently */ 788 return (0); 789 790 if (uio->uio_resid == 0) 791 return (0); 792 793 if (uio->uio_resid < 0 || uio->uio_resid > TUNMRU) { 794 TUNDEBUG(ifp, "len=%d!\n", uio->uio_resid); 795 return (EIO); 796 } 797 798 if ((m = m_uiotombuf(uio, M_DONTWAIT, 0, 0)) == NULL) { 799 ifp->if_ierrors++; 800 return (error); 801 } 802 803 m->m_pkthdr.rcvif = ifp; 804 #ifdef MAC 805 mac_create_mbuf_from_ifnet(ifp, m); 806 #endif 807 808 /* Could be unlocked read? */ 809 mtx_lock(&tp->tun_mtx); 810 if (tp->tun_flags & TUN_IFHEAD) { 811 mtx_unlock(&tp->tun_mtx); 812 if (m->m_len < sizeof(family) && 813 (m = m_pullup(m, sizeof(family))) == NULL) 814 return (ENOBUFS); 815 family = ntohl(*mtod(m, u_int32_t *)); 816 m_adj(m, sizeof(family)); 817 } else { 818 mtx_unlock(&tp->tun_mtx); 819 family = AF_INET; 820 } 821 822 BPF_MTAP2(ifp, &family, sizeof(family), m); 823 824 switch (family) { 825 #ifdef INET 826 case AF_INET: 827 isr = NETISR_IP; 828 break; 829 #endif 830 #ifdef INET6 831 case AF_INET6: 832 isr = NETISR_IPV6; 833 break; 834 #endif 835 #ifdef IPX 836 case AF_IPX: 837 isr = NETISR_IPX; 838 break; 839 #endif 840 #ifdef NETATALK 841 case AF_APPLETALK: 842 isr = NETISR_ATALK2; 843 break; 844 #endif 845 default: 846 m_freem(m); 847 return (EAFNOSUPPORT); 848 } 849 /* First chunk of an mbuf contains good junk */ 850 if (harvest.point_to_point) 851 random_harvest(m, 16, 3, 0, RANDOM_NET); 852 ifp->if_ibytes += m->m_pkthdr.len; 853 ifp->if_ipackets++; 854 netisr_dispatch(isr, m); 855 return (0); 856 } 857 858 /* 859 * tunpoll - the poll interface, this is only useful on reads 860 * really. The write detect always returns true, write never blocks 861 * anyway, it either accepts the packet or drops it. 862 */ 863 static int 864 tunpoll(struct cdev *dev, int events, struct thread *td) 865 { 866 int s; 867 struct tun_softc *tp = dev->si_drv1; 868 struct ifnet *ifp = TUN2IFP(tp); 869 int revents = 0; 870 struct mbuf *m; 871 872 s = splimp(); 873 TUNDEBUG(ifp, "tunpoll\n"); 874 875 if (events & (POLLIN | POLLRDNORM)) { 876 IFQ_LOCK(&ifp->if_snd); 877 IFQ_POLL_NOLOCK(&ifp->if_snd, m); 878 if (m != NULL) { 879 TUNDEBUG(ifp, "tunpoll q=%d\n", ifp->if_snd.ifq_len); 880 revents |= events & (POLLIN | POLLRDNORM); 881 } else { 882 TUNDEBUG(ifp, "tunpoll waiting\n"); 883 selrecord(td, &tp->tun_rsel); 884 } 885 IFQ_UNLOCK(&ifp->if_snd); 886 } 887 if (events & (POLLOUT | POLLWRNORM)) 888 revents |= events & (POLLOUT | POLLWRNORM); 889 890 splx(s); 891 return (revents); 892 } 893 894 /* 895 * tunkqfilter - support for the kevent() system call. 896 */ 897 static int 898 tunkqfilter(struct cdev *dev, struct knote *kn) 899 { 900 int s; 901 struct tun_softc *tp = dev->si_drv1; 902 struct ifnet *ifp = TUN2IFP(tp); 903 904 s = splimp(); 905 switch(kn->kn_filter) { 906 case EVFILT_READ: 907 TUNDEBUG(ifp, "%s kqfilter: EVFILT_READ, minor = %#x\n", 908 ifp->if_xname, minor(dev)); 909 kn->kn_fop = &tun_read_filterops; 910 break; 911 912 case EVFILT_WRITE: 913 TUNDEBUG(ifp, "%s kqfilter: EVFILT_WRITE, minor = %#x\n", 914 ifp->if_xname, minor(dev)); 915 kn->kn_fop = &tun_write_filterops; 916 break; 917 918 default: 919 TUNDEBUG(ifp, "%s kqfilter: invalid filter, minor = %#x\n", 920 ifp->if_xname, minor(dev)); 921 splx(s); 922 return(EINVAL); 923 } 924 splx(s); 925 926 kn->kn_hook = (caddr_t) dev; 927 knlist_add(&tp->tun_rsel.si_note, kn, 0); 928 929 return (0); 930 } 931 932 /* 933 * Return true of there is data in the interface queue. 934 */ 935 static int 936 tunkqread(struct knote *kn, long hint) 937 { 938 int ret, s; 939 struct cdev *dev = (struct cdev *)(kn->kn_hook); 940 struct tun_softc *tp = dev->si_drv1; 941 struct ifnet *ifp = TUN2IFP(tp); 942 943 s = splimp(); 944 if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) { 945 TUNDEBUG(ifp, 946 "%s have data in the queue. Len = %d, minor = %#x\n", 947 ifp->if_xname, ifp->if_snd.ifq_len, minor(dev)); 948 ret = 1; 949 } else { 950 TUNDEBUG(ifp, 951 "%s waiting for data, minor = %#x\n", ifp->if_xname, 952 minor(dev)); 953 ret = 0; 954 } 955 splx(s); 956 957 return (ret); 958 } 959 960 /* 961 * Always can write, always return MTU in kn->data. 962 */ 963 static int 964 tunkqwrite(struct knote *kn, long hint) 965 { 966 int s; 967 struct tun_softc *tp = ((struct cdev *)kn->kn_hook)->si_drv1; 968 struct ifnet *ifp = TUN2IFP(tp); 969 970 s = splimp(); 971 kn->kn_data = ifp->if_mtu; 972 splx(s); 973 974 return (1); 975 } 976 977 static void 978 tunkqdetach(struct knote *kn) 979 { 980 struct tun_softc *tp = ((struct cdev *)kn->kn_hook)->si_drv1; 981 982 knlist_remove(&tp->tun_rsel.si_note, kn, 0); 983 }
Cache object: a9aaeb5fa88ea3f2e0e49cde3311a187
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]