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/6.4/sys/net/if_tun.c 167203 2007-03-04 14:34:42Z bms $ 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_clone.h> 49 #include <net/if_types.h> 50 #include <net/netisr.h> 51 #include <net/route.h> 52 #ifdef INET 53 #include <netinet/in.h> 54 #endif 55 #include <net/bpf.h> 56 #include <net/if_tun.h> 57 58 #include <sys/queue.h> 59 60 /* 61 * tun_list is protected by global tunmtx. Other mutable fields are 62 * protected by tun->tun_mtx, or by their owning subsystem. tun_dev is 63 * static for the duration of a tunnel interface. 64 */ 65 struct tun_softc { 66 TAILQ_ENTRY(tun_softc) tun_list; 67 struct cdev *tun_dev; 68 u_short tun_flags; /* misc flags */ 69 #define TUN_OPEN 0x0001 70 #define TUN_INITED 0x0002 71 #define TUN_RCOLL 0x0004 72 #define TUN_IASET 0x0008 73 #define TUN_DSTADDR 0x0010 74 #define TUN_LMODE 0x0020 75 #define TUN_RWAIT 0x0040 76 #define TUN_ASYNC 0x0080 77 #define TUN_IFHEAD 0x0100 78 79 #define TUN_READY (TUN_OPEN | TUN_INITED) 80 81 /* 82 * XXXRW: tun_pid is used to exclusively lock /dev/tun. Is this 83 * actually needed? Can we just return EBUSY if already open? 84 * Problem is that this involved inherent races when a tun device 85 * is handed off from one process to another, as opposed to just 86 * being slightly stale informationally. 87 */ 88 pid_t tun_pid; /* owning pid */ 89 struct ifnet *tun_ifp; /* the interface */ 90 struct sigio *tun_sigio; /* information for async I/O */ 91 struct selinfo tun_rsel; /* read select */ 92 struct mtx tun_mtx; /* protect mutable softc fields */ 93 }; 94 #define TUN2IFP(sc) ((sc)->tun_ifp) 95 96 #define TUNDEBUG if (tundebug) if_printf 97 #define TUNNAME "tun" 98 99 /* 100 * All mutable global variables in if_tun are locked using tunmtx, with 101 * the exception of tundebug, which is used unlocked, and tunclones, 102 * which is static after setup. 103 */ 104 static struct mtx tunmtx; 105 static MALLOC_DEFINE(M_TUN, TUNNAME, "Tunnel Interface"); 106 static int tundebug = 0; 107 static int tundclone = 1; 108 static struct clonedevs *tunclones; 109 static TAILQ_HEAD(,tun_softc) tunhead = TAILQ_HEAD_INITIALIZER(tunhead); 110 SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, ""); 111 112 SYSCTL_DECL(_net_link); 113 SYSCTL_NODE(_net_link, OID_AUTO, tun, CTLFLAG_RW, 0, 114 "IP tunnel software network interface."); 115 SYSCTL_INT(_net_link_tun, OID_AUTO, devfs_cloning, CTLFLAG_RW, &tundclone, 0, 116 "Enable legacy devfs interface creation."); 117 118 TUNABLE_INT("net.link.tun.devfs_cloning", &tundclone); 119 120 static void tunclone(void *arg, struct ucred *cred, char *name, 121 int namelen, struct cdev **dev); 122 static void tuncreate(const char *name, struct cdev *dev); 123 static int tunifioctl(struct ifnet *, u_long, caddr_t); 124 static int tuninit(struct ifnet *); 125 static int tunmodevent(module_t, int, void *); 126 static int tunoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 127 struct rtentry *rt); 128 static void tunstart(struct ifnet *); 129 130 static int tun_clone_create(struct if_clone *, int); 131 static void tun_clone_destroy(struct ifnet *); 132 133 IFC_SIMPLE_DECLARE(tun, 0); 134 135 static d_open_t tunopen; 136 static d_close_t tunclose; 137 static d_read_t tunread; 138 static d_write_t tunwrite; 139 static d_ioctl_t tunioctl; 140 static d_poll_t tunpoll; 141 static d_kqfilter_t tunkqfilter; 142 143 static int tunkqread(struct knote *, long); 144 static int tunkqwrite(struct knote *, long); 145 static void tunkqdetach(struct knote *); 146 147 static struct filterops tun_read_filterops = { 148 .f_isfd = 1, 149 .f_attach = NULL, 150 .f_detach = tunkqdetach, 151 .f_event = tunkqread, 152 }; 153 154 static struct filterops tun_write_filterops = { 155 .f_isfd = 1, 156 .f_attach = NULL, 157 .f_detach = tunkqdetach, 158 .f_event = tunkqwrite, 159 }; 160 161 static struct cdevsw tun_cdevsw = { 162 .d_version = D_VERSION, 163 .d_flags = D_PSEUDO | D_NEEDGIANT, 164 .d_open = tunopen, 165 .d_close = tunclose, 166 .d_read = tunread, 167 .d_write = tunwrite, 168 .d_ioctl = tunioctl, 169 .d_poll = tunpoll, 170 .d_kqfilter = tunkqfilter, 171 .d_name = TUNNAME, 172 }; 173 174 static int 175 tun_clone_create(struct if_clone *ifc, int unit) 176 { 177 struct cdev *dev; 178 int i; 179 180 /* find any existing device, or allocate new unit number */ 181 i = clone_create(&tunclones, &tun_cdevsw, &unit, &dev, 0); 182 if (i) { 183 /* No preexisting struct cdev *, create one */ 184 dev = make_dev(&tun_cdevsw, unit2minor(unit), 185 UID_UUCP, GID_DIALER, 0600, "%s%d", ifc->ifc_name, unit); 186 if (dev != NULL) { 187 dev_ref(dev); 188 dev->si_flags |= SI_CHEAPCLONE; 189 } 190 } 191 tuncreate(ifc->ifc_name, dev); 192 193 return (0); 194 } 195 196 static void 197 tunclone(void *arg, struct ucred *cred, char *name, int namelen, 198 struct cdev **dev) 199 { 200 char devname[SPECNAMELEN + 1]; 201 int u, i, append_unit; 202 203 if (*dev != NULL) 204 return; 205 206 /* 207 * If tun cloning is enabled, only the superuser can create an 208 * interface. 209 */ 210 if (!tundclone || suser_cred(cred, SUSER_ALLOWJAIL) != 0) 211 return; 212 213 if (strcmp(name, TUNNAME) == 0) { 214 u = -1; 215 } else if (dev_stdclone(name, NULL, TUNNAME, &u) != 1) 216 return; /* Don't recognise the name */ 217 if (u != -1 && u > IF_MAXUNIT) 218 return; /* Unit number too high */ 219 220 if (u == -1) 221 append_unit = 1; 222 else 223 append_unit = 0; 224 225 /* find any existing device, or allocate new unit number */ 226 i = clone_create(&tunclones, &tun_cdevsw, &u, dev, 0); 227 if (i) { 228 if (append_unit) { 229 namelen = snprintf(devname, sizeof(devname), "%s%d", name, 230 u); 231 name = devname; 232 } 233 /* No preexisting struct cdev *, create one */ 234 *dev = make_dev(&tun_cdevsw, unit2minor(u), 235 UID_UUCP, GID_DIALER, 0600, "%s", name); 236 if (*dev != NULL) { 237 dev_ref(*dev); 238 (*dev)->si_flags |= SI_CHEAPCLONE; 239 } 240 } 241 242 if_clone_create(name, namelen); 243 } 244 245 static void 246 tun_destroy(struct tun_softc *tp) 247 { 248 struct cdev *dev; 249 250 /* Unlocked read. */ 251 KASSERT((tp->tun_flags & TUN_OPEN) == 0, 252 ("tununits is out of sync - unit %d", TUN2IFP(tp)->if_dunit)); 253 254 dev = tp->tun_dev; 255 bpfdetach(TUN2IFP(tp)); 256 if_detach(TUN2IFP(tp)); 257 if_free(TUN2IFP(tp)); 258 destroy_dev(dev); 259 knlist_destroy(&tp->tun_rsel.si_note); 260 mtx_destroy(&tp->tun_mtx); 261 free(tp, M_TUN); 262 } 263 264 static void 265 tun_clone_destroy(struct ifnet *ifp) 266 { 267 struct tun_softc *tp = ifp->if_softc; 268 269 mtx_lock(&tunmtx); 270 TAILQ_REMOVE(&tunhead, tp, tun_list); 271 mtx_unlock(&tunmtx); 272 tun_destroy(tp); 273 } 274 275 static int 276 tunmodevent(module_t mod, int type, void *data) 277 { 278 static eventhandler_tag tag; 279 struct tun_softc *tp; 280 281 switch (type) { 282 case MOD_LOAD: 283 mtx_init(&tunmtx, "tunmtx", NULL, MTX_DEF); 284 clone_setup(&tunclones); 285 tag = EVENTHANDLER_REGISTER(dev_clone, tunclone, 0, 1000); 286 if (tag == NULL) 287 return (ENOMEM); 288 if_clone_attach(&tun_cloner); 289 break; 290 case MOD_UNLOAD: 291 if_clone_detach(&tun_cloner); 292 EVENTHANDLER_DEREGISTER(dev_clone, tag); 293 294 mtx_lock(&tunmtx); 295 while ((tp = TAILQ_FIRST(&tunhead)) != NULL) { 296 TAILQ_REMOVE(&tunhead, tp, tun_list); 297 mtx_unlock(&tunmtx); 298 tun_destroy(tp); 299 mtx_lock(&tunmtx); 300 } 301 mtx_unlock(&tunmtx); 302 clone_cleanup(&tunclones); 303 mtx_destroy(&tunmtx); 304 break; 305 default: 306 return EOPNOTSUPP; 307 } 308 return 0; 309 } 310 311 static moduledata_t tun_mod = { 312 "if_tun", 313 tunmodevent, 314 0 315 }; 316 317 DECLARE_MODULE(if_tun, tun_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 318 319 static void 320 tunstart(struct ifnet *ifp) 321 { 322 struct tun_softc *tp = ifp->if_softc; 323 struct mbuf *m; 324 325 TUNDEBUG(ifp,"%s starting\n", ifp->if_xname); 326 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 327 IFQ_LOCK(&ifp->if_snd); 328 IFQ_POLL_NOLOCK(&ifp->if_snd, m); 329 if (m == NULL) { 330 IFQ_UNLOCK(&ifp->if_snd); 331 return; 332 } 333 IFQ_UNLOCK(&ifp->if_snd); 334 } 335 336 mtx_lock(&tp->tun_mtx); 337 if (tp->tun_flags & TUN_RWAIT) { 338 tp->tun_flags &= ~TUN_RWAIT; 339 wakeup(tp); 340 } 341 if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio) { 342 mtx_unlock(&tp->tun_mtx); 343 pgsigio(&tp->tun_sigio, SIGIO, 0); 344 } else 345 mtx_unlock(&tp->tun_mtx); 346 selwakeuppri(&tp->tun_rsel, PZERO + 1); 347 KNOTE_UNLOCKED(&tp->tun_rsel.si_note, 0); 348 } 349 350 /* XXX: should return an error code so it can fail. */ 351 static void 352 tuncreate(const char *name, struct cdev *dev) 353 { 354 struct tun_softc *sc; 355 struct ifnet *ifp; 356 357 dev->si_flags &= ~SI_CHEAPCLONE; 358 359 MALLOC(sc, struct tun_softc *, sizeof(*sc), M_TUN, M_WAITOK | M_ZERO); 360 mtx_init(&sc->tun_mtx, "tun_mtx", NULL, MTX_DEF); 361 sc->tun_flags = TUN_INITED; 362 sc->tun_dev = dev; 363 mtx_lock(&tunmtx); 364 TAILQ_INSERT_TAIL(&tunhead, sc, tun_list); 365 mtx_unlock(&tunmtx); 366 367 ifp = sc->tun_ifp = if_alloc(IFT_PPP); 368 if (ifp == NULL) 369 panic("%s%d: failed to if_alloc() interface.\n", 370 name, dev2unit(dev)); 371 if_initname(ifp, name, dev2unit(dev)); 372 ifp->if_mtu = TUNMTU; 373 ifp->if_ioctl = tunifioctl; 374 ifp->if_output = tunoutput; 375 ifp->if_start = tunstart; 376 ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 377 ifp->if_softc = sc; 378 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 379 ifp->if_snd.ifq_drv_maxlen = 0; 380 IFQ_SET_READY(&ifp->if_snd); 381 knlist_init(&sc->tun_rsel.si_note, NULL, NULL, NULL, NULL); 382 383 if_attach(ifp); 384 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 385 dev->si_drv1 = sc; 386 TUNDEBUG(ifp, "interface %s is created, minor = %#x\n", 387 ifp->if_xname, minor(dev)); 388 } 389 390 static int 391 tunopen(struct cdev *dev, int flag, int mode, struct thread *td) 392 { 393 struct ifnet *ifp; 394 struct tun_softc *tp; 395 396 /* 397 * XXXRW: Non-atomic test and set of dev->si_drv1 requires 398 * synchronization. 399 */ 400 tp = dev->si_drv1; 401 if (!tp) { 402 tuncreate(TUNNAME, dev); 403 tp = dev->si_drv1; 404 } 405 406 /* 407 * XXXRW: This use of tun_pid is subject to error due to the 408 * fact that a reference to the tunnel can live beyond the 409 * death of the process that created it. Can we replace this 410 * with a simple busy flag? 411 */ 412 mtx_lock(&tp->tun_mtx); 413 if (tp->tun_pid != 0 && tp->tun_pid != td->td_proc->p_pid) { 414 mtx_unlock(&tp->tun_mtx); 415 return (EBUSY); 416 } 417 tp->tun_pid = td->td_proc->p_pid; 418 419 tp->tun_flags |= TUN_OPEN; 420 mtx_unlock(&tp->tun_mtx); 421 ifp = TUN2IFP(tp); 422 TUNDEBUG(ifp, "open\n"); 423 424 return (0); 425 } 426 427 /* 428 * tunclose - close the device - mark i/f down & delete 429 * routing info 430 */ 431 static int 432 tunclose(struct cdev *dev, int foo, int bar, struct thread *td) 433 { 434 struct tun_softc *tp; 435 struct ifnet *ifp; 436 int s; 437 438 tp = dev->si_drv1; 439 ifp = TUN2IFP(tp); 440 441 mtx_lock(&tp->tun_mtx); 442 tp->tun_flags &= ~TUN_OPEN; 443 tp->tun_pid = 0; 444 445 /* 446 * junk all pending output 447 */ 448 s = splimp(); 449 IFQ_PURGE(&ifp->if_snd); 450 splx(s); 451 mtx_unlock(&tp->tun_mtx); 452 453 if (ifp->if_flags & IFF_UP) { 454 s = splimp(); 455 if_down(ifp); 456 splx(s); 457 } 458 459 /* Delete all addresses and routes which reference this interface. */ 460 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 461 struct ifaddr *ifa; 462 463 s = splimp(); 464 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 465 /* deal w/IPv4 PtP destination; unlocked read */ 466 if (ifa->ifa_addr->sa_family == AF_INET) { 467 rtinit(ifa, (int)RTM_DELETE, 468 tp->tun_flags & TUN_DSTADDR ? RTF_HOST : 0); 469 } else { 470 rtinit(ifa, (int)RTM_DELETE, 0); 471 } 472 } 473 if_purgeaddrs(ifp); 474 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 475 splx(s); 476 } 477 478 funsetown(&tp->tun_sigio); 479 selwakeuppri(&tp->tun_rsel, PZERO + 1); 480 KNOTE_UNLOCKED(&tp->tun_rsel.si_note, 0); 481 TUNDEBUG (ifp, "closed\n"); 482 return (0); 483 } 484 485 static int 486 tuninit(struct ifnet *ifp) 487 { 488 struct tun_softc *tp = ifp->if_softc; 489 struct ifaddr *ifa; 490 int error = 0; 491 492 TUNDEBUG(ifp, "tuninit\n"); 493 494 ifp->if_flags |= IFF_UP; 495 ifp->if_drv_flags |= IFF_DRV_RUNNING; 496 getmicrotime(&ifp->if_lastchange); 497 498 #ifdef INET 499 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 500 if (ifa->ifa_addr->sa_family == AF_INET) { 501 struct sockaddr_in *si; 502 503 si = (struct sockaddr_in *)ifa->ifa_addr; 504 mtx_lock(&tp->tun_mtx); 505 if (si->sin_addr.s_addr) 506 tp->tun_flags |= TUN_IASET; 507 508 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 509 if (si && si->sin_addr.s_addr) 510 tp->tun_flags |= TUN_DSTADDR; 511 mtx_unlock(&tp->tun_mtx); 512 } 513 } 514 #endif 515 return (error); 516 } 517 518 /* 519 * Process an ioctl request. 520 */ 521 static int 522 tunifioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 523 { 524 struct ifreq *ifr = (struct ifreq *)data; 525 struct tun_softc *tp = ifp->if_softc; 526 struct ifstat *ifs; 527 int error = 0, s; 528 529 s = splimp(); 530 switch(cmd) { 531 case SIOCGIFSTATUS: 532 ifs = (struct ifstat *)data; 533 mtx_lock(&tp->tun_mtx); 534 if (tp->tun_pid) 535 sprintf(ifs->ascii + strlen(ifs->ascii), 536 "\tOpened by PID %d\n", tp->tun_pid); 537 mtx_unlock(&tp->tun_mtx); 538 break; 539 case SIOCSIFADDR: 540 error = tuninit(ifp); 541 TUNDEBUG(ifp, "address set, error=%d\n", error); 542 break; 543 case SIOCSIFDSTADDR: 544 error = tuninit(ifp); 545 TUNDEBUG(ifp, "destination address set, error=%d\n", error); 546 break; 547 case SIOCSIFMTU: 548 ifp->if_mtu = ifr->ifr_mtu; 549 TUNDEBUG(ifp, "mtu set\n"); 550 break; 551 case SIOCSIFFLAGS: 552 case SIOCADDMULTI: 553 case SIOCDELMULTI: 554 break; 555 default: 556 error = EINVAL; 557 } 558 splx(s); 559 return (error); 560 } 561 562 /* 563 * tunoutput - queue packets from higher level ready to put out. 564 */ 565 static int 566 tunoutput( 567 struct ifnet *ifp, 568 struct mbuf *m0, 569 struct sockaddr *dst, 570 struct rtentry *rt) 571 { 572 struct tun_softc *tp = ifp->if_softc; 573 u_short cached_tun_flags; 574 int error; 575 u_int32_t af; 576 577 TUNDEBUG (ifp, "tunoutput\n"); 578 579 #ifdef MAC 580 error = mac_check_ifnet_transmit(ifp, m0); 581 if (error) { 582 m_freem(m0); 583 return (error); 584 } 585 #endif 586 587 /* Could be unlocked read? */ 588 mtx_lock(&tp->tun_mtx); 589 cached_tun_flags = tp->tun_flags; 590 mtx_unlock(&tp->tun_mtx); 591 if ((cached_tun_flags & TUN_READY) != TUN_READY) { 592 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 593 m_freem (m0); 594 return (EHOSTDOWN); 595 } 596 597 if ((ifp->if_flags & IFF_UP) != IFF_UP) { 598 m_freem (m0); 599 return (EHOSTDOWN); 600 } 601 602 /* BPF writes need to be handled specially. */ 603 if (dst->sa_family == AF_UNSPEC) { 604 bcopy(dst->sa_data, &af, sizeof(af)); 605 dst->sa_family = af; 606 } 607 608 if (bpf_peers_present(ifp->if_bpf)) { 609 af = dst->sa_family; 610 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m0); 611 } 612 613 /* prepend sockaddr? this may abort if the mbuf allocation fails */ 614 if (cached_tun_flags & TUN_LMODE) { 615 /* allocate space for sockaddr */ 616 M_PREPEND(m0, dst->sa_len, M_DONTWAIT); 617 618 /* if allocation failed drop packet */ 619 if (m0 == NULL) { 620 ifp->if_iqdrops++; 621 ifp->if_oerrors++; 622 return (ENOBUFS); 623 } else { 624 bcopy(dst, m0->m_data, dst->sa_len); 625 } 626 } 627 628 if (cached_tun_flags & TUN_IFHEAD) { 629 /* Prepend the address family */ 630 M_PREPEND(m0, 4, M_DONTWAIT); 631 632 /* if allocation failed drop packet */ 633 if (m0 == NULL) { 634 ifp->if_iqdrops++; 635 ifp->if_oerrors++; 636 return (ENOBUFS); 637 } else 638 *(u_int32_t *)m0->m_data = htonl(dst->sa_family); 639 } else { 640 #ifdef INET 641 if (dst->sa_family != AF_INET) 642 #endif 643 { 644 m_freem(m0); 645 return (EAFNOSUPPORT); 646 } 647 } 648 649 IFQ_HANDOFF(ifp, m0, error); 650 if (error) { 651 ifp->if_collisions++; 652 return (ENOBUFS); 653 } 654 ifp->if_opackets++; 655 return (0); 656 } 657 658 /* 659 * the cdevsw interface is now pretty minimal. 660 */ 661 static int 662 tunioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 663 { 664 int s; 665 int error; 666 struct tun_softc *tp = dev->si_drv1; 667 struct tuninfo *tunp; 668 669 switch (cmd) { 670 case TUNSIFINFO: 671 tunp = (struct tuninfo *)data; 672 if (tunp->mtu < IF_MINMTU) 673 return (EINVAL); 674 if (TUN2IFP(tp)->if_mtu != tunp->mtu) { 675 error = suser(td); 676 if (error != 0) 677 return (error); 678 } 679 TUN2IFP(tp)->if_mtu = tunp->mtu; 680 TUN2IFP(tp)->if_type = tunp->type; 681 TUN2IFP(tp)->if_baudrate = tunp->baudrate; 682 break; 683 case TUNGIFINFO: 684 tunp = (struct tuninfo *)data; 685 tunp->mtu = TUN2IFP(tp)->if_mtu; 686 tunp->type = TUN2IFP(tp)->if_type; 687 tunp->baudrate = TUN2IFP(tp)->if_baudrate; 688 break; 689 case TUNSDEBUG: 690 tundebug = *(int *)data; 691 break; 692 case TUNGDEBUG: 693 *(int *)data = tundebug; 694 break; 695 case TUNSLMODE: 696 mtx_lock(&tp->tun_mtx); 697 if (*(int *)data) { 698 tp->tun_flags |= TUN_LMODE; 699 tp->tun_flags &= ~TUN_IFHEAD; 700 } else 701 tp->tun_flags &= ~TUN_LMODE; 702 mtx_unlock(&tp->tun_mtx); 703 break; 704 case TUNSIFHEAD: 705 mtx_lock(&tp->tun_mtx); 706 if (*(int *)data) { 707 tp->tun_flags |= TUN_IFHEAD; 708 tp->tun_flags &= ~TUN_LMODE; 709 } else 710 tp->tun_flags &= ~TUN_IFHEAD; 711 mtx_unlock(&tp->tun_mtx); 712 break; 713 case TUNGIFHEAD: 714 /* Could be unlocked read? */ 715 mtx_lock(&tp->tun_mtx); 716 *(int *)data = (tp->tun_flags & TUN_IFHEAD) ? 1 : 0; 717 mtx_unlock(&tp->tun_mtx); 718 break; 719 case TUNSIFMODE: 720 /* deny this if UP */ 721 if (TUN2IFP(tp)->if_flags & IFF_UP) 722 return(EBUSY); 723 724 switch (*(int *)data & ~IFF_MULTICAST) { 725 case IFF_POINTOPOINT: 726 case IFF_BROADCAST: 727 TUN2IFP(tp)->if_flags &= 728 ~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST); 729 TUN2IFP(tp)->if_flags |= *(int *)data; 730 break; 731 default: 732 return(EINVAL); 733 } 734 break; 735 case TUNSIFPID: 736 mtx_lock(&tp->tun_mtx); 737 tp->tun_pid = curthread->td_proc->p_pid; 738 mtx_unlock(&tp->tun_mtx); 739 break; 740 case FIONBIO: 741 break; 742 case FIOASYNC: 743 mtx_lock(&tp->tun_mtx); 744 if (*(int *)data) 745 tp->tun_flags |= TUN_ASYNC; 746 else 747 tp->tun_flags &= ~TUN_ASYNC; 748 mtx_unlock(&tp->tun_mtx); 749 break; 750 case FIONREAD: 751 s = splimp(); 752 if (!IFQ_IS_EMPTY(&TUN2IFP(tp)->if_snd)) { 753 struct mbuf *mb; 754 IFQ_LOCK(&TUN2IFP(tp)->if_snd); 755 IFQ_POLL_NOLOCK(&TUN2IFP(tp)->if_snd, mb); 756 for( *(int *)data = 0; mb != 0; mb = mb->m_next) 757 *(int *)data += mb->m_len; 758 IFQ_UNLOCK(&TUN2IFP(tp)->if_snd); 759 } else 760 *(int *)data = 0; 761 splx(s); 762 break; 763 case FIOSETOWN: 764 return (fsetown(*(int *)data, &tp->tun_sigio)); 765 766 case FIOGETOWN: 767 *(int *)data = fgetown(&tp->tun_sigio); 768 return (0); 769 770 /* This is deprecated, FIOSETOWN should be used instead. */ 771 case TIOCSPGRP: 772 return (fsetown(-(*(int *)data), &tp->tun_sigio)); 773 774 /* This is deprecated, FIOGETOWN should be used instead. */ 775 case TIOCGPGRP: 776 *(int *)data = -fgetown(&tp->tun_sigio); 777 return (0); 778 779 default: 780 return (ENOTTY); 781 } 782 return (0); 783 } 784 785 /* 786 * The cdevsw read interface - reads a packet at a time, or at 787 * least as much of a packet as can be read. 788 */ 789 static int 790 tunread(struct cdev *dev, struct uio *uio, int flag) 791 { 792 struct tun_softc *tp = dev->si_drv1; 793 struct ifnet *ifp = TUN2IFP(tp); 794 struct mbuf *m; 795 int error=0, len, s; 796 797 TUNDEBUG (ifp, "read\n"); 798 mtx_lock(&tp->tun_mtx); 799 if ((tp->tun_flags & TUN_READY) != TUN_READY) { 800 mtx_unlock(&tp->tun_mtx); 801 TUNDEBUG (ifp, "not ready 0%o\n", tp->tun_flags); 802 return (EHOSTDOWN); 803 } 804 805 tp->tun_flags &= ~TUN_RWAIT; 806 mtx_unlock(&tp->tun_mtx); 807 808 s = splimp(); 809 do { 810 IFQ_DEQUEUE(&ifp->if_snd, m); 811 if (m == NULL) { 812 if (flag & O_NONBLOCK) { 813 splx(s); 814 return (EWOULDBLOCK); 815 } 816 mtx_lock(&tp->tun_mtx); 817 tp->tun_flags |= TUN_RWAIT; 818 mtx_unlock(&tp->tun_mtx); 819 if ((error = tsleep(tp, PCATCH | (PZERO + 1), 820 "tunread", 0)) != 0) { 821 splx(s); 822 return (error); 823 } 824 } 825 } while (m == NULL); 826 splx(s); 827 828 while (m && uio->uio_resid > 0 && error == 0) { 829 len = min(uio->uio_resid, m->m_len); 830 if (len != 0) 831 error = uiomove(mtod(m, void *), len, uio); 832 m = m_free(m); 833 } 834 835 if (m) { 836 TUNDEBUG(ifp, "Dropping mbuf\n"); 837 m_freem(m); 838 } 839 return (error); 840 } 841 842 /* 843 * the cdevsw write interface - an atomic write is a packet - or else! 844 */ 845 static int 846 tunwrite(struct cdev *dev, struct uio *uio, int flag) 847 { 848 struct tun_softc *tp = dev->si_drv1; 849 struct ifnet *ifp = TUN2IFP(tp); 850 struct mbuf *m; 851 int error = 0; 852 uint32_t family; 853 int isr; 854 855 TUNDEBUG(ifp, "tunwrite\n"); 856 857 if ((ifp->if_flags & IFF_UP) != IFF_UP) 858 /* ignore silently */ 859 return (0); 860 861 if (uio->uio_resid == 0) 862 return (0); 863 864 if (uio->uio_resid < 0 || uio->uio_resid > TUNMRU) { 865 TUNDEBUG(ifp, "len=%d!\n", uio->uio_resid); 866 return (EIO); 867 } 868 869 if ((m = m_uiotombuf(uio, M_DONTWAIT, 0, 0)) == NULL) { 870 ifp->if_ierrors++; 871 return (error); 872 } 873 874 m->m_pkthdr.rcvif = ifp; 875 #ifdef MAC 876 mac_create_mbuf_from_ifnet(ifp, m); 877 #endif 878 879 /* Could be unlocked read? */ 880 mtx_lock(&tp->tun_mtx); 881 if (tp->tun_flags & TUN_IFHEAD) { 882 mtx_unlock(&tp->tun_mtx); 883 if (m->m_len < sizeof(family) && 884 (m = m_pullup(m, sizeof(family))) == NULL) 885 return (ENOBUFS); 886 family = ntohl(*mtod(m, u_int32_t *)); 887 m_adj(m, sizeof(family)); 888 } else { 889 mtx_unlock(&tp->tun_mtx); 890 family = AF_INET; 891 } 892 893 BPF_MTAP2(ifp, &family, sizeof(family), m); 894 895 switch (family) { 896 #ifdef INET 897 case AF_INET: 898 isr = NETISR_IP; 899 break; 900 #endif 901 #ifdef INET6 902 case AF_INET6: 903 isr = NETISR_IPV6; 904 break; 905 #endif 906 #ifdef IPX 907 case AF_IPX: 908 isr = NETISR_IPX; 909 break; 910 #endif 911 #ifdef NETATALK 912 case AF_APPLETALK: 913 isr = NETISR_ATALK2; 914 break; 915 #endif 916 default: 917 m_freem(m); 918 return (EAFNOSUPPORT); 919 } 920 /* First chunk of an mbuf contains good junk */ 921 if (harvest.point_to_point) 922 random_harvest(m, 16, 3, 0, RANDOM_NET); 923 ifp->if_ibytes += m->m_pkthdr.len; 924 ifp->if_ipackets++; 925 netisr_dispatch(isr, m); 926 return (0); 927 } 928 929 /* 930 * tunpoll - the poll interface, this is only useful on reads 931 * really. The write detect always returns true, write never blocks 932 * anyway, it either accepts the packet or drops it. 933 */ 934 static int 935 tunpoll(struct cdev *dev, int events, struct thread *td) 936 { 937 int s; 938 struct tun_softc *tp = dev->si_drv1; 939 struct ifnet *ifp = TUN2IFP(tp); 940 int revents = 0; 941 struct mbuf *m; 942 943 s = splimp(); 944 TUNDEBUG(ifp, "tunpoll\n"); 945 946 if (events & (POLLIN | POLLRDNORM)) { 947 IFQ_LOCK(&ifp->if_snd); 948 IFQ_POLL_NOLOCK(&ifp->if_snd, m); 949 if (m != NULL) { 950 TUNDEBUG(ifp, "tunpoll q=%d\n", ifp->if_snd.ifq_len); 951 revents |= events & (POLLIN | POLLRDNORM); 952 } else { 953 TUNDEBUG(ifp, "tunpoll waiting\n"); 954 selrecord(td, &tp->tun_rsel); 955 } 956 IFQ_UNLOCK(&ifp->if_snd); 957 } 958 if (events & (POLLOUT | POLLWRNORM)) 959 revents |= events & (POLLOUT | POLLWRNORM); 960 961 splx(s); 962 return (revents); 963 } 964 965 /* 966 * tunkqfilter - support for the kevent() system call. 967 */ 968 static int 969 tunkqfilter(struct cdev *dev, struct knote *kn) 970 { 971 int s; 972 struct tun_softc *tp = dev->si_drv1; 973 struct ifnet *ifp = TUN2IFP(tp); 974 975 s = splimp(); 976 switch(kn->kn_filter) { 977 case EVFILT_READ: 978 TUNDEBUG(ifp, "%s kqfilter: EVFILT_READ, minor = %#x\n", 979 ifp->if_xname, minor(dev)); 980 kn->kn_fop = &tun_read_filterops; 981 break; 982 983 case EVFILT_WRITE: 984 TUNDEBUG(ifp, "%s kqfilter: EVFILT_WRITE, minor = %#x\n", 985 ifp->if_xname, minor(dev)); 986 kn->kn_fop = &tun_write_filterops; 987 break; 988 989 default: 990 TUNDEBUG(ifp, "%s kqfilter: invalid filter, minor = %#x\n", 991 ifp->if_xname, minor(dev)); 992 splx(s); 993 return(EINVAL); 994 } 995 splx(s); 996 997 kn->kn_hook = (caddr_t) dev; 998 knlist_add(&tp->tun_rsel.si_note, kn, 0); 999 1000 return (0); 1001 } 1002 1003 /* 1004 * Return true of there is data in the interface queue. 1005 */ 1006 static int 1007 tunkqread(struct knote *kn, long hint) 1008 { 1009 int ret, s; 1010 struct cdev *dev = (struct cdev *)(kn->kn_hook); 1011 struct tun_softc *tp = dev->si_drv1; 1012 struct ifnet *ifp = TUN2IFP(tp); 1013 1014 s = splimp(); 1015 if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) { 1016 TUNDEBUG(ifp, 1017 "%s have data in the queue. Len = %d, minor = %#x\n", 1018 ifp->if_xname, ifp->if_snd.ifq_len, minor(dev)); 1019 ret = 1; 1020 } else { 1021 TUNDEBUG(ifp, 1022 "%s waiting for data, minor = %#x\n", ifp->if_xname, 1023 minor(dev)); 1024 ret = 0; 1025 } 1026 splx(s); 1027 1028 return (ret); 1029 } 1030 1031 /* 1032 * Always can write, always return MTU in kn->data. 1033 */ 1034 static int 1035 tunkqwrite(struct knote *kn, long hint) 1036 { 1037 int s; 1038 struct tun_softc *tp = ((struct cdev *)kn->kn_hook)->si_drv1; 1039 struct ifnet *ifp = TUN2IFP(tp); 1040 1041 s = splimp(); 1042 kn->kn_data = ifp->if_mtu; 1043 splx(s); 1044 1045 return (1); 1046 } 1047 1048 static void 1049 tunkqdetach(struct knote *kn) 1050 { 1051 struct tun_softc *tp = ((struct cdev *)kn->kn_hook)->si_drv1; 1052 1053 knlist_remove(&tp->tun_rsel.si_note, kn, 0); 1054 }
Cache object: 123889f588a61ba1035a90d62e3fad23
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]