| 1 | /* $NetBSD: if_tun.c,v 1.133 2016/10/02 14:17:07 christos 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 its |
| 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 | |
| 17 | #include <sys/cdefs.h> |
| 18 | __KERNEL_RCSID(0, "$NetBSD: if_tun.c,v 1.133 2016/10/02 14:17:07 christos Exp $" ); |
| 19 | |
| 20 | #ifdef _KERNEL_OPT |
| 21 | #include "opt_inet.h" |
| 22 | #endif |
| 23 | |
| 24 | #include <sys/param.h> |
| 25 | #include <sys/proc.h> |
| 26 | #include <sys/systm.h> |
| 27 | #include <sys/mbuf.h> |
| 28 | #include <sys/buf.h> |
| 29 | #include <sys/protosw.h> |
| 30 | #include <sys/socket.h> |
| 31 | #include <sys/ioctl.h> |
| 32 | #include <sys/errno.h> |
| 33 | #include <sys/syslog.h> |
| 34 | #include <sys/select.h> |
| 35 | #include <sys/poll.h> |
| 36 | #include <sys/file.h> |
| 37 | #include <sys/signalvar.h> |
| 38 | #include <sys/conf.h> |
| 39 | #include <sys/kauth.h> |
| 40 | #include <sys/mutex.h> |
| 41 | #include <sys/cpu.h> |
| 42 | #include <sys/device.h> |
| 43 | #include <sys/module.h> |
| 44 | |
| 45 | #include <net/if.h> |
| 46 | #include <net/if_types.h> |
| 47 | #include <net/netisr.h> |
| 48 | #include <net/route.h> |
| 49 | |
| 50 | |
| 51 | #ifdef INET |
| 52 | #include <netinet/in.h> |
| 53 | #include <netinet/in_systm.h> |
| 54 | #include <netinet/in_var.h> |
| 55 | #include <netinet/ip.h> |
| 56 | #include <netinet/if_inarp.h> |
| 57 | #endif |
| 58 | |
| 59 | |
| 60 | #include <sys/time.h> |
| 61 | #include <net/bpf.h> |
| 62 | |
| 63 | #include <net/if_tun.h> |
| 64 | |
| 65 | #include "ioconf.h" |
| 66 | |
| 67 | #define TUNDEBUG if (tundebug) printf |
| 68 | int tundebug = 0; |
| 69 | |
| 70 | extern int ifqmaxlen; |
| 71 | |
| 72 | static LIST_HEAD(, tun_softc) tun_softc_list; |
| 73 | static LIST_HEAD(, tun_softc) tunz_softc_list; |
| 74 | static kmutex_t tun_softc_lock; |
| 75 | |
| 76 | static int tun_ioctl(struct ifnet *, u_long, void *); |
| 77 | static int tun_output(struct ifnet *, struct mbuf *, |
| 78 | const struct sockaddr *, const struct rtentry *rt); |
| 79 | static int tun_clone_create(struct if_clone *, int); |
| 80 | static int tun_clone_destroy(struct ifnet *); |
| 81 | |
| 82 | static struct if_clone tun_cloner = |
| 83 | IF_CLONE_INITIALIZER("tun" , tun_clone_create, tun_clone_destroy); |
| 84 | |
| 85 | static void tunattach0(struct tun_softc *); |
| 86 | static void tun_enable(struct tun_softc *, const struct ifaddr *); |
| 87 | static void tun_i_softintr(void *); |
| 88 | static void tun_o_softintr(void *); |
| 89 | #ifdef ALTQ |
| 90 | static void tunstart(struct ifnet *); |
| 91 | #endif |
| 92 | static struct tun_softc *tun_find_unit(dev_t); |
| 93 | static struct tun_softc *tun_find_zunit(int); |
| 94 | |
| 95 | static dev_type_open(tunopen); |
| 96 | static dev_type_close(tunclose); |
| 97 | static dev_type_read(tunread); |
| 98 | static dev_type_write(tunwrite); |
| 99 | static dev_type_ioctl(tunioctl); |
| 100 | static dev_type_poll(tunpoll); |
| 101 | static dev_type_kqfilter(tunkqfilter); |
| 102 | |
| 103 | const struct cdevsw tun_cdevsw = { |
| 104 | .d_open = tunopen, |
| 105 | .d_close = tunclose, |
| 106 | .d_read = tunread, |
| 107 | .d_write = tunwrite, |
| 108 | .d_ioctl = tunioctl, |
| 109 | .d_stop = nostop, |
| 110 | .d_tty = notty, |
| 111 | .d_poll = tunpoll, |
| 112 | .d_mmap = nommap, |
| 113 | .d_kqfilter = tunkqfilter, |
| 114 | .d_discard = nodiscard, |
| 115 | .d_flag = D_OTHER |
| 116 | }; |
| 117 | |
| 118 | #ifdef _MODULE |
| 119 | devmajor_t tun_bmajor = -1, tun_cmajor = -1; |
| 120 | #endif |
| 121 | |
| 122 | void |
| 123 | tunattach(int unused) |
| 124 | { |
| 125 | |
| 126 | /* |
| 127 | * Nothing to do here, initialization is handled by the |
| 128 | * module initialization code in tuninit() below). |
| 129 | */ |
| 130 | } |
| 131 | |
| 132 | static void |
| 133 | tuninit(void) |
| 134 | { |
| 135 | |
| 136 | mutex_init(&tun_softc_lock, MUTEX_DEFAULT, IPL_NET); |
| 137 | LIST_INIT(&tun_softc_list); |
| 138 | LIST_INIT(&tunz_softc_list); |
| 139 | if_clone_attach(&tun_cloner); |
| 140 | #ifdef _MODULE |
| 141 | devsw_attach("tun" , NULL, &tun_bmajor, &tun_cdevsw, &tun_cmajor); |
| 142 | #endif |
| 143 | } |
| 144 | |
| 145 | static int |
| 146 | tundetach(void) |
| 147 | { |
| 148 | int error = 0; |
| 149 | |
| 150 | if (!LIST_EMPTY(&tun_softc_list) || !LIST_EMPTY(&tunz_softc_list)) |
| 151 | error = EBUSY; |
| 152 | |
| 153 | #ifdef _MODULE |
| 154 | if (error == 0) |
| 155 | error = devsw_detach(NULL, &tun_cdevsw); |
| 156 | #endif |
| 157 | if (error == 0) { |
| 158 | if_clone_detach(&tun_cloner); |
| 159 | mutex_destroy(&tun_softc_lock); |
| 160 | } |
| 161 | |
| 162 | return error; |
| 163 | } |
| 164 | |
| 165 | /* |
| 166 | * Find driver instance from dev_t. |
| 167 | * Returns with tp locked (if found). |
| 168 | */ |
| 169 | static struct tun_softc * |
| 170 | tun_find_unit(dev_t dev) |
| 171 | { |
| 172 | struct tun_softc *tp; |
| 173 | int unit = minor(dev); |
| 174 | |
| 175 | mutex_enter(&tun_softc_lock); |
| 176 | LIST_FOREACH(tp, &tun_softc_list, tun_list) |
| 177 | if (unit == tp->tun_unit) |
| 178 | break; |
| 179 | if (tp) |
| 180 | mutex_enter(&tp->tun_lock); |
| 181 | mutex_exit(&tun_softc_lock); |
| 182 | |
| 183 | return (tp); |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Find zombie driver instance by unit number. |
| 188 | * Remove tp from list and return it unlocked (if found). |
| 189 | */ |
| 190 | static struct tun_softc * |
| 191 | tun_find_zunit(int unit) |
| 192 | { |
| 193 | struct tun_softc *tp; |
| 194 | |
| 195 | mutex_enter(&tun_softc_lock); |
| 196 | LIST_FOREACH(tp, &tunz_softc_list, tun_list) |
| 197 | if (unit == tp->tun_unit) |
| 198 | break; |
| 199 | if (tp) |
| 200 | LIST_REMOVE(tp, tun_list); |
| 201 | mutex_exit(&tun_softc_lock); |
| 202 | #ifdef DIAGNOSTIC |
| 203 | if (tp != NULL && (tp->tun_flags & (TUN_INITED|TUN_OPEN)) != TUN_OPEN) |
| 204 | printf("tun%d: inconsistent flags: %x\n" , unit, tp->tun_flags); |
| 205 | #endif |
| 206 | |
| 207 | return (tp); |
| 208 | } |
| 209 | |
| 210 | static int |
| 211 | tun_clone_create(struct if_clone *ifc, int unit) |
| 212 | { |
| 213 | struct tun_softc *tp; |
| 214 | |
| 215 | if ((tp = tun_find_zunit(unit)) == NULL) { |
| 216 | /* Allocate a new instance */ |
| 217 | tp = malloc(sizeof(*tp), M_DEVBUF, M_WAITOK|M_ZERO); |
| 218 | |
| 219 | tp->tun_unit = unit; |
| 220 | mutex_init(&tp->tun_lock, MUTEX_DEFAULT, IPL_NET); |
| 221 | selinit(&tp->tun_rsel); |
| 222 | selinit(&tp->tun_wsel); |
| 223 | } else { |
| 224 | /* Revive tunnel instance; clear ifp part */ |
| 225 | (void)memset(&tp->tun_if, 0, sizeof(struct ifnet)); |
| 226 | } |
| 227 | |
| 228 | if_initname(&tp->tun_if, ifc->ifc_name, unit); |
| 229 | tunattach0(tp); |
| 230 | tp->tun_flags |= TUN_INITED; |
| 231 | tp->tun_osih = softint_establish(SOFTINT_CLOCK, tun_o_softintr, tp); |
| 232 | tp->tun_isih = softint_establish(SOFTINT_CLOCK, tun_i_softintr, tp); |
| 233 | |
| 234 | mutex_enter(&tun_softc_lock); |
| 235 | LIST_INSERT_HEAD(&tun_softc_list, tp, tun_list); |
| 236 | mutex_exit(&tun_softc_lock); |
| 237 | |
| 238 | return (0); |
| 239 | } |
| 240 | |
| 241 | static void |
| 242 | tunattach0(struct tun_softc *tp) |
| 243 | { |
| 244 | struct ifnet *ifp; |
| 245 | |
| 246 | ifp = &tp->tun_if; |
| 247 | ifp->if_softc = tp; |
| 248 | ifp->if_mtu = TUNMTU; |
| 249 | ifp->if_ioctl = tun_ioctl; |
| 250 | ifp->if_output = tun_output; |
| 251 | #ifdef ALTQ |
| 252 | ifp->if_start = tunstart; |
| 253 | #endif |
| 254 | ifp->if_flags = IFF_POINTOPOINT; |
| 255 | ifp->if_type = IFT_TUNNEL; |
| 256 | ifp->if_snd.ifq_maxlen = ifqmaxlen; |
| 257 | ifp->if_collisions = 0; |
| 258 | ifp->if_ierrors = 0; |
| 259 | ifp->if_oerrors = 0; |
| 260 | ifp->if_ipackets = 0; |
| 261 | ifp->if_opackets = 0; |
| 262 | ifp->if_ibytes = 0; |
| 263 | ifp->if_obytes = 0; |
| 264 | ifp->if_dlt = DLT_NULL; |
| 265 | IFQ_SET_READY(&ifp->if_snd); |
| 266 | if_attach(ifp); |
| 267 | if_alloc_sadl(ifp); |
| 268 | bpf_attach(ifp, DLT_NULL, sizeof(uint32_t)); |
| 269 | } |
| 270 | |
| 271 | static int |
| 272 | tun_clone_destroy(struct ifnet *ifp) |
| 273 | { |
| 274 | struct tun_softc *tp = (void *)ifp; |
| 275 | int zombie = 0; |
| 276 | |
| 277 | IF_PURGE(&ifp->if_snd); |
| 278 | ifp->if_flags &= ~IFF_RUNNING; |
| 279 | |
| 280 | mutex_enter(&tun_softc_lock); |
| 281 | mutex_enter(&tp->tun_lock); |
| 282 | LIST_REMOVE(tp, tun_list); |
| 283 | if (tp->tun_flags & TUN_OPEN) { |
| 284 | /* Hang on to storage until last close */ |
| 285 | zombie = 1; |
| 286 | tp->tun_flags &= ~TUN_INITED; |
| 287 | LIST_INSERT_HEAD(&tunz_softc_list, tp, tun_list); |
| 288 | } |
| 289 | mutex_exit(&tun_softc_lock); |
| 290 | |
| 291 | if (tp->tun_flags & TUN_RWAIT) { |
| 292 | tp->tun_flags &= ~TUN_RWAIT; |
| 293 | wakeup((void *)tp); |
| 294 | } |
| 295 | selnotify(&tp->tun_rsel, 0, 0); |
| 296 | |
| 297 | mutex_exit(&tp->tun_lock); |
| 298 | |
| 299 | if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid) |
| 300 | fownsignal(tp->tun_pgid, SIGIO, POLL_HUP, 0, NULL); |
| 301 | |
| 302 | bpf_detach(ifp); |
| 303 | if_detach(ifp); |
| 304 | |
| 305 | if (!zombie) { |
| 306 | seldestroy(&tp->tun_rsel); |
| 307 | seldestroy(&tp->tun_wsel); |
| 308 | softint_disestablish(tp->tun_osih); |
| 309 | softint_disestablish(tp->tun_isih); |
| 310 | mutex_destroy(&tp->tun_lock); |
| 311 | free(tp, M_DEVBUF); |
| 312 | } |
| 313 | |
| 314 | return (0); |
| 315 | } |
| 316 | |
| 317 | /* |
| 318 | * tunnel open - must be superuser & the device must be |
| 319 | * configured in |
| 320 | */ |
| 321 | static int |
| 322 | tunopen(dev_t dev, int flag, int mode, struct lwp *l) |
| 323 | { |
| 324 | struct ifnet *ifp; |
| 325 | struct tun_softc *tp; |
| 326 | int error; |
| 327 | |
| 328 | error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE_TUN, |
| 329 | KAUTH_REQ_NETWORK_INTERFACE_TUN_ADD, NULL, NULL, NULL); |
| 330 | if (error) |
| 331 | return (error); |
| 332 | |
| 333 | tp = tun_find_unit(dev); |
| 334 | |
| 335 | if (tp == NULL) { |
| 336 | (void)tun_clone_create(&tun_cloner, minor(dev)); |
| 337 | tp = tun_find_unit(dev); |
| 338 | if (tp == NULL) { |
| 339 | error = ENXIO; |
| 340 | goto out_nolock; |
| 341 | } |
| 342 | } |
| 343 | |
| 344 | if (tp->tun_flags & TUN_OPEN) { |
| 345 | error = EBUSY; |
| 346 | goto out; |
| 347 | } |
| 348 | |
| 349 | ifp = &tp->tun_if; |
| 350 | tp->tun_flags |= TUN_OPEN; |
| 351 | TUNDEBUG("%s: open\n" , ifp->if_xname); |
| 352 | out: |
| 353 | mutex_exit(&tp->tun_lock); |
| 354 | out_nolock: |
| 355 | return (error); |
| 356 | } |
| 357 | |
| 358 | /* |
| 359 | * tunclose - close the device - mark i/f down & delete |
| 360 | * routing info |
| 361 | */ |
| 362 | int |
| 363 | tunclose(dev_t dev, int flag, int mode, |
| 364 | struct lwp *l) |
| 365 | { |
| 366 | struct tun_softc *tp; |
| 367 | struct ifnet *ifp; |
| 368 | |
| 369 | if ((tp = tun_find_zunit(minor(dev))) != NULL) { |
| 370 | /* interface was "destroyed" before the close */ |
| 371 | seldestroy(&tp->tun_rsel); |
| 372 | seldestroy(&tp->tun_wsel); |
| 373 | softint_disestablish(tp->tun_osih); |
| 374 | softint_disestablish(tp->tun_isih); |
| 375 | mutex_destroy(&tp->tun_lock); |
| 376 | free(tp, M_DEVBUF); |
| 377 | goto out_nolock; |
| 378 | } |
| 379 | |
| 380 | if ((tp = tun_find_unit(dev)) == NULL) |
| 381 | goto out_nolock; |
| 382 | |
| 383 | ifp = &tp->tun_if; |
| 384 | |
| 385 | tp->tun_flags &= ~TUN_OPEN; |
| 386 | |
| 387 | tp->tun_pgid = 0; |
| 388 | selnotify(&tp->tun_rsel, 0, 0); |
| 389 | |
| 390 | TUNDEBUG ("%s: closed\n" , ifp->if_xname); |
| 391 | mutex_exit(&tp->tun_lock); |
| 392 | |
| 393 | /* |
| 394 | * junk all pending output |
| 395 | */ |
| 396 | IFQ_PURGE(&ifp->if_snd); |
| 397 | |
| 398 | if (ifp->if_flags & IFF_UP) { |
| 399 | if_down(ifp); |
| 400 | if (ifp->if_flags & IFF_RUNNING) { |
| 401 | /* find internet addresses and delete routes */ |
| 402 | struct ifaddr *ifa; |
| 403 | IFADDR_READER_FOREACH(ifa, ifp) { |
| 404 | #if defined(INET) || defined(INET6) |
| 405 | if (ifa->ifa_addr->sa_family == AF_INET || |
| 406 | ifa->ifa_addr->sa_family == AF_INET6) { |
| 407 | rtinit(ifa, (int)RTM_DELETE, |
| 408 | tp->tun_flags & TUN_DSTADDR |
| 409 | ? RTF_HOST |
| 410 | : 0); |
| 411 | } |
| 412 | #endif |
| 413 | } |
| 414 | } |
| 415 | } |
| 416 | out_nolock: |
| 417 | return (0); |
| 418 | } |
| 419 | |
| 420 | /* |
| 421 | * Call at splnet(). |
| 422 | */ |
| 423 | static void |
| 424 | tun_enable(struct tun_softc *tp, const struct ifaddr *ifa) |
| 425 | { |
| 426 | struct ifnet *ifp = &tp->tun_if; |
| 427 | |
| 428 | TUNDEBUG("%s: %s\n" , __func__, ifp->if_xname); |
| 429 | |
| 430 | mutex_enter(&tp->tun_lock); |
| 431 | ifp->if_flags |= IFF_UP | IFF_RUNNING; |
| 432 | |
| 433 | tp->tun_flags &= ~(TUN_IASET|TUN_DSTADDR); |
| 434 | |
| 435 | switch (ifa->ifa_addr->sa_family) { |
| 436 | #ifdef INET |
| 437 | case AF_INET: { |
| 438 | struct sockaddr_in *sin; |
| 439 | |
| 440 | sin = satosin(ifa->ifa_addr); |
| 441 | if (sin && sin->sin_addr.s_addr) |
| 442 | tp->tun_flags |= TUN_IASET; |
| 443 | |
| 444 | if (ifp->if_flags & IFF_POINTOPOINT) { |
| 445 | sin = satosin(ifa->ifa_dstaddr); |
| 446 | if (sin && sin->sin_addr.s_addr) |
| 447 | tp->tun_flags |= TUN_DSTADDR; |
| 448 | } |
| 449 | break; |
| 450 | } |
| 451 | #endif |
| 452 | #ifdef INET6 |
| 453 | case AF_INET6: { |
| 454 | struct sockaddr_in6 *sin; |
| 455 | |
| 456 | sin = satosin6(ifa->ifa_addr); |
| 457 | if (!IN6_IS_ADDR_UNSPECIFIED(&sin->sin6_addr)) |
| 458 | tp->tun_flags |= TUN_IASET; |
| 459 | |
| 460 | if (ifp->if_flags & IFF_POINTOPOINT) { |
| 461 | sin = satosin6(ifa->ifa_dstaddr); |
| 462 | if (sin && !IN6_IS_ADDR_UNSPECIFIED(&sin->sin6_addr)) |
| 463 | tp->tun_flags |= TUN_DSTADDR; |
| 464 | } else |
| 465 | tp->tun_flags &= ~TUN_DSTADDR; |
| 466 | break; |
| 467 | } |
| 468 | #endif /* INET6 */ |
| 469 | default: |
| 470 | break; |
| 471 | } |
| 472 | mutex_exit(&tp->tun_lock); |
| 473 | } |
| 474 | |
| 475 | /* |
| 476 | * Process an ioctl request. |
| 477 | */ |
| 478 | static int |
| 479 | tun_ioctl(struct ifnet *ifp, u_long cmd, void *data) |
| 480 | { |
| 481 | int error = 0, s; |
| 482 | struct tun_softc *tp = (struct tun_softc *)(ifp->if_softc); |
| 483 | struct ifreq *ifr = (struct ifreq *)data; |
| 484 | struct ifaddr *ifa = (struct ifaddr *)data; |
| 485 | |
| 486 | s = splnet(); |
| 487 | |
| 488 | switch (cmd) { |
| 489 | case SIOCINITIFADDR: |
| 490 | tun_enable(tp, ifa); |
| 491 | ifa->ifa_rtrequest = p2p_rtrequest; |
| 492 | TUNDEBUG("%s: address set\n" , ifp->if_xname); |
| 493 | break; |
| 494 | case SIOCSIFBRDADDR: |
| 495 | TUNDEBUG("%s: broadcast address set\n" , ifp->if_xname); |
| 496 | break; |
| 497 | case SIOCSIFMTU: |
| 498 | if (ifr->ifr_mtu > TUNMTU || ifr->ifr_mtu < 576) { |
| 499 | error = EINVAL; |
| 500 | break; |
| 501 | } |
| 502 | TUNDEBUG("%s: interface mtu set\n" , ifp->if_xname); |
| 503 | if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) |
| 504 | error = 0; |
| 505 | break; |
| 506 | case SIOCADDMULTI: |
| 507 | case SIOCDELMULTI: |
| 508 | if (ifr == NULL) { |
| 509 | error = EAFNOSUPPORT; /* XXX */ |
| 510 | break; |
| 511 | } |
| 512 | switch (ifreq_getaddr(cmd, ifr)->sa_family) { |
| 513 | #ifdef INET |
| 514 | case AF_INET: |
| 515 | break; |
| 516 | #endif |
| 517 | #ifdef INET6 |
| 518 | case AF_INET6: |
| 519 | break; |
| 520 | #endif |
| 521 | default: |
| 522 | error = EAFNOSUPPORT; |
| 523 | break; |
| 524 | } |
| 525 | break; |
| 526 | default: |
| 527 | error = ifioctl_common(ifp, cmd, data); |
| 528 | } |
| 529 | |
| 530 | splx(s); |
| 531 | return (error); |
| 532 | } |
| 533 | |
| 534 | /* |
| 535 | * tun_output - queue packets from higher level ready to put out. |
| 536 | */ |
| 537 | static int |
| 538 | tun_output(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, |
| 539 | const struct rtentry *rt) |
| 540 | { |
| 541 | struct tun_softc *tp = ifp->if_softc; |
| 542 | int s; |
| 543 | int error; |
| 544 | #if defined(INET) || defined(INET6) |
| 545 | int mlen; |
| 546 | uint32_t *af; |
| 547 | #endif |
| 548 | |
| 549 | s = splnet(); |
| 550 | mutex_enter(&tp->tun_lock); |
| 551 | TUNDEBUG ("%s: tun_output\n" , ifp->if_xname); |
| 552 | |
| 553 | if ((tp->tun_flags & TUN_READY) != TUN_READY) { |
| 554 | TUNDEBUG ("%s: not ready 0%o\n" , ifp->if_xname, |
| 555 | tp->tun_flags); |
| 556 | error = EHOSTDOWN; |
| 557 | goto out; |
| 558 | } |
| 559 | |
| 560 | /* |
| 561 | * if the queueing discipline needs packet classification, |
| 562 | * do it before prepending link headers. |
| 563 | */ |
| 564 | IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family); |
| 565 | |
| 566 | bpf_mtap_af(ifp, dst->sa_family, m0); |
| 567 | |
| 568 | switch(dst->sa_family) { |
| 569 | #ifdef INET6 |
| 570 | case AF_INET6: |
| 571 | #endif |
| 572 | #ifdef INET |
| 573 | case AF_INET: |
| 574 | #endif |
| 575 | #if defined(INET) || defined(INET6) |
| 576 | if (tp->tun_flags & TUN_PREPADDR) { |
| 577 | /* Simple link-layer header */ |
| 578 | M_PREPEND(m0, dst->sa_len, M_DONTWAIT); |
| 579 | if (m0 == NULL) { |
| 580 | IF_DROP(&ifp->if_snd); |
| 581 | error = ENOBUFS; |
| 582 | goto out; |
| 583 | } |
| 584 | bcopy(dst, mtod(m0, char *), dst->sa_len); |
| 585 | } |
| 586 | |
| 587 | if (tp->tun_flags & TUN_IFHEAD) { |
| 588 | /* Prepend the address family */ |
| 589 | M_PREPEND(m0, sizeof(*af), M_DONTWAIT); |
| 590 | if (m0 == NULL) { |
| 591 | IF_DROP(&ifp->if_snd); |
| 592 | error = ENOBUFS; |
| 593 | goto out; |
| 594 | } |
| 595 | af = mtod(m0,uint32_t *); |
| 596 | *af = htonl(dst->sa_family); |
| 597 | } else { |
| 598 | #ifdef INET |
| 599 | if (dst->sa_family != AF_INET) |
| 600 | #endif |
| 601 | { |
| 602 | error = EAFNOSUPPORT; |
| 603 | goto out; |
| 604 | } |
| 605 | } |
| 606 | /* FALLTHROUGH */ |
| 607 | case AF_UNSPEC: |
| 608 | IFQ_ENQUEUE(&ifp->if_snd, m0, error); |
| 609 | if (error) { |
| 610 | ifp->if_collisions++; |
| 611 | error = EAFNOSUPPORT; |
| 612 | m0 = NULL; |
| 613 | goto out; |
| 614 | } |
| 615 | mlen = m0->m_pkthdr.len; |
| 616 | ifp->if_opackets++; |
| 617 | ifp->if_obytes += mlen; |
| 618 | break; |
| 619 | #endif |
| 620 | default: |
| 621 | error = EAFNOSUPPORT; |
| 622 | goto out; |
| 623 | } |
| 624 | |
| 625 | if (tp->tun_flags & TUN_RWAIT) { |
| 626 | tp->tun_flags &= ~TUN_RWAIT; |
| 627 | wakeup((void *)tp); |
| 628 | } |
| 629 | if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid) |
| 630 | softint_schedule(tp->tun_isih); |
| 631 | |
| 632 | selnotify(&tp->tun_rsel, 0, 0); |
| 633 | out: |
| 634 | mutex_exit(&tp->tun_lock); |
| 635 | splx(s); |
| 636 | |
| 637 | if (error && m0) { |
| 638 | m_freem(m0); |
| 639 | } |
| 640 | return 0; |
| 641 | } |
| 642 | |
| 643 | static void |
| 644 | tun_i_softintr(void *cookie) |
| 645 | { |
| 646 | struct tun_softc *tp = cookie; |
| 647 | |
| 648 | if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid) |
| 649 | fownsignal(tp->tun_pgid, SIGIO, POLL_IN, POLLIN|POLLRDNORM, |
| 650 | NULL); |
| 651 | } |
| 652 | |
| 653 | static void |
| 654 | tun_o_softintr(void *cookie) |
| 655 | { |
| 656 | struct tun_softc *tp = cookie; |
| 657 | |
| 658 | if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid) |
| 659 | fownsignal(tp->tun_pgid, SIGIO, POLL_OUT, POLLOUT|POLLWRNORM, |
| 660 | NULL); |
| 661 | } |
| 662 | |
| 663 | /* |
| 664 | * the cdevsw interface is now pretty minimal. |
| 665 | */ |
| 666 | int |
| 667 | tunioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) |
| 668 | { |
| 669 | struct tun_softc *tp; |
| 670 | int s, error = 0; |
| 671 | |
| 672 | s = splnet(); |
| 673 | tp = tun_find_unit(dev); |
| 674 | |
| 675 | /* interface was "destroyed" already */ |
| 676 | if (tp == NULL) { |
| 677 | error = ENXIO; |
| 678 | goto out_nolock; |
| 679 | } |
| 680 | |
| 681 | switch (cmd) { |
| 682 | case TUNSDEBUG: |
| 683 | tundebug = *(int *)data; |
| 684 | break; |
| 685 | |
| 686 | case TUNGDEBUG: |
| 687 | *(int *)data = tundebug; |
| 688 | break; |
| 689 | |
| 690 | case TUNSIFMODE: |
| 691 | switch (*(int *)data & (IFF_POINTOPOINT|IFF_BROADCAST)) { |
| 692 | case IFF_POINTOPOINT: |
| 693 | case IFF_BROADCAST: |
| 694 | if (tp->tun_if.if_flags & IFF_UP) { |
| 695 | error = EBUSY; |
| 696 | goto out; |
| 697 | } |
| 698 | tp->tun_if.if_flags &= |
| 699 | ~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST); |
| 700 | tp->tun_if.if_flags |= *(int *)data; |
| 701 | break; |
| 702 | default: |
| 703 | error = EINVAL; |
| 704 | goto out; |
| 705 | } |
| 706 | break; |
| 707 | |
| 708 | case TUNSLMODE: |
| 709 | if (*(int *)data) { |
| 710 | tp->tun_flags |= TUN_PREPADDR; |
| 711 | tp->tun_flags &= ~TUN_IFHEAD; |
| 712 | } else |
| 713 | tp->tun_flags &= ~TUN_PREPADDR; |
| 714 | break; |
| 715 | |
| 716 | case TUNSIFHEAD: |
| 717 | if (*(int *)data) { |
| 718 | tp->tun_flags |= TUN_IFHEAD; |
| 719 | tp->tun_flags &= ~TUN_PREPADDR; |
| 720 | } else |
| 721 | tp->tun_flags &= ~TUN_IFHEAD; |
| 722 | break; |
| 723 | |
| 724 | case TUNGIFHEAD: |
| 725 | *(int *)data = (tp->tun_flags & TUN_IFHEAD); |
| 726 | break; |
| 727 | |
| 728 | case FIONBIO: |
| 729 | if (*(int *)data) |
| 730 | tp->tun_flags |= TUN_NBIO; |
| 731 | else |
| 732 | tp->tun_flags &= ~TUN_NBIO; |
| 733 | break; |
| 734 | |
| 735 | case FIOASYNC: |
| 736 | if (*(int *)data) |
| 737 | tp->tun_flags |= TUN_ASYNC; |
| 738 | else |
| 739 | tp->tun_flags &= ~TUN_ASYNC; |
| 740 | break; |
| 741 | |
| 742 | case FIONREAD: |
| 743 | if (tp->tun_if.if_snd.ifq_head) |
| 744 | *(int *)data = tp->tun_if.if_snd.ifq_head->m_pkthdr.len; |
| 745 | else |
| 746 | *(int *)data = 0; |
| 747 | break; |
| 748 | |
| 749 | case TIOCSPGRP: |
| 750 | case FIOSETOWN: |
| 751 | error = fsetown(&tp->tun_pgid, cmd, data); |
| 752 | break; |
| 753 | |
| 754 | case TIOCGPGRP: |
| 755 | case FIOGETOWN: |
| 756 | error = fgetown(tp->tun_pgid, cmd, data); |
| 757 | break; |
| 758 | |
| 759 | default: |
| 760 | error = ENOTTY; |
| 761 | } |
| 762 | |
| 763 | out: |
| 764 | mutex_exit(&tp->tun_lock); |
| 765 | out_nolock: |
| 766 | splx(s); |
| 767 | return (error); |
| 768 | } |
| 769 | |
| 770 | /* |
| 771 | * The cdevsw read interface - reads a packet at a time, or at |
| 772 | * least as much of a packet as can be read. |
| 773 | */ |
| 774 | int |
| 775 | tunread(dev_t dev, struct uio *uio, int ioflag) |
| 776 | { |
| 777 | struct tun_softc *tp; |
| 778 | struct ifnet *ifp; |
| 779 | struct mbuf *m, *m0; |
| 780 | int error = 0, len, s, index; |
| 781 | |
| 782 | s = splnet(); |
| 783 | tp = tun_find_unit(dev); |
| 784 | |
| 785 | /* interface was "destroyed" already */ |
| 786 | if (tp == NULL) { |
| 787 | error = ENXIO; |
| 788 | goto out_nolock; |
| 789 | } |
| 790 | |
| 791 | index = tp->tun_if.if_index; |
| 792 | ifp = &tp->tun_if; |
| 793 | |
| 794 | TUNDEBUG ("%s: read\n" , ifp->if_xname); |
| 795 | if ((tp->tun_flags & TUN_READY) != TUN_READY) { |
| 796 | TUNDEBUG ("%s: not ready 0%o\n" , ifp->if_xname, tp->tun_flags); |
| 797 | error = EHOSTDOWN; |
| 798 | goto out; |
| 799 | } |
| 800 | |
| 801 | tp->tun_flags &= ~TUN_RWAIT; |
| 802 | |
| 803 | do { |
| 804 | IFQ_DEQUEUE(&ifp->if_snd, m0); |
| 805 | if (m0 == 0) { |
| 806 | if (tp->tun_flags & TUN_NBIO) { |
| 807 | error = EWOULDBLOCK; |
| 808 | goto out; |
| 809 | } |
| 810 | tp->tun_flags |= TUN_RWAIT; |
| 811 | if (mtsleep((void *)tp, PZERO|PCATCH|PNORELOCK, |
| 812 | "tunread" , 0, &tp->tun_lock) != 0) { |
| 813 | error = EINTR; |
| 814 | goto out_nolock; |
| 815 | } else { |
| 816 | /* |
| 817 | * Maybe the interface was destroyed while |
| 818 | * we were sleeping, so let's ensure that |
| 819 | * we're looking at the same (valid) tun |
| 820 | * interface before looping. |
| 821 | */ |
| 822 | tp = tun_find_unit(dev); |
| 823 | if (tp == NULL) { |
| 824 | error = ENXIO; |
| 825 | goto out_nolock; |
| 826 | } |
| 827 | if (tp->tun_if.if_index != index) { |
| 828 | error = ENXIO; |
| 829 | goto out; |
| 830 | } |
| 831 | } |
| 832 | } |
| 833 | } while (m0 == 0); |
| 834 | |
| 835 | mutex_exit(&tp->tun_lock); |
| 836 | splx(s); |
| 837 | |
| 838 | /* Copy the mbuf chain */ |
| 839 | while (m0 && uio->uio_resid > 0 && error == 0) { |
| 840 | len = min(uio->uio_resid, m0->m_len); |
| 841 | if (len != 0) |
| 842 | error = uiomove(mtod(m0, void *), len, uio); |
| 843 | m0 = m = m_free(m0); |
| 844 | } |
| 845 | |
| 846 | if (m0) { |
| 847 | TUNDEBUG("Dropping mbuf\n" ); |
| 848 | m_freem(m0); |
| 849 | } |
| 850 | if (error) |
| 851 | ifp->if_ierrors++; |
| 852 | |
| 853 | return (error); |
| 854 | |
| 855 | out: |
| 856 | mutex_exit(&tp->tun_lock); |
| 857 | out_nolock: |
| 858 | splx(s); |
| 859 | return (error); |
| 860 | } |
| 861 | |
| 862 | /* |
| 863 | * the cdevsw write interface - an atomic write is a packet - or else! |
| 864 | */ |
| 865 | int |
| 866 | tunwrite(dev_t dev, struct uio *uio, int ioflag) |
| 867 | { |
| 868 | struct tun_softc *tp; |
| 869 | struct ifnet *ifp; |
| 870 | struct mbuf *top, **mp, *m; |
| 871 | pktqueue_t *pktq; |
| 872 | struct sockaddr dst; |
| 873 | int error = 0, s, tlen, mlen; |
| 874 | uint32_t family; |
| 875 | |
| 876 | s = splnet(); |
| 877 | tp = tun_find_unit(dev); |
| 878 | |
| 879 | /* interface was "destroyed" already */ |
| 880 | if (tp == NULL) { |
| 881 | error = ENXIO; |
| 882 | goto out_nolock; |
| 883 | } |
| 884 | |
| 885 | /* Unlock until we've got the data */ |
| 886 | mutex_exit(&tp->tun_lock); |
| 887 | splx(s); |
| 888 | |
| 889 | ifp = &tp->tun_if; |
| 890 | |
| 891 | TUNDEBUG("%s: tunwrite\n" , ifp->if_xname); |
| 892 | |
| 893 | if (tp->tun_flags & TUN_PREPADDR) { |
| 894 | if (uio->uio_resid < sizeof(dst)) { |
| 895 | error = EIO; |
| 896 | goto out0; |
| 897 | } |
| 898 | error = uiomove((void *)&dst, sizeof(dst), uio); |
| 899 | if (dst.sa_len > sizeof(dst)) { |
| 900 | /* Duh.. */ |
| 901 | char discard; |
| 902 | int n = dst.sa_len - sizeof(dst); |
| 903 | while (n--) |
| 904 | if ((error = uiomove(&discard, 1, uio)) != 0) { |
| 905 | goto out0; |
| 906 | } |
| 907 | } |
| 908 | } else if (tp->tun_flags & TUN_IFHEAD) { |
| 909 | if (uio->uio_resid < sizeof(family)){ |
| 910 | error = EIO; |
| 911 | goto out0; |
| 912 | } |
| 913 | error = uiomove((void *)&family, sizeof(family), uio); |
| 914 | dst.sa_family = ntohl(family); |
| 915 | } else { |
| 916 | #ifdef INET |
| 917 | dst.sa_family = AF_INET; |
| 918 | #endif |
| 919 | } |
| 920 | |
| 921 | if (uio->uio_resid > TUNMTU) { |
| 922 | TUNDEBUG("%s: len=%lu!\n" , ifp->if_xname, |
| 923 | (unsigned long)uio->uio_resid); |
| 924 | error = EIO; |
| 925 | goto out0; |
| 926 | } |
| 927 | |
| 928 | switch (dst.sa_family) { |
| 929 | #ifdef INET |
| 930 | case AF_INET: |
| 931 | pktq = ip_pktq; |
| 932 | break; |
| 933 | #endif |
| 934 | #ifdef INET6 |
| 935 | case AF_INET6: |
| 936 | pktq = ip6_pktq; |
| 937 | break; |
| 938 | #endif |
| 939 | default: |
| 940 | error = EAFNOSUPPORT; |
| 941 | goto out0; |
| 942 | } |
| 943 | |
| 944 | tlen = uio->uio_resid; |
| 945 | |
| 946 | /* get a header mbuf */ |
| 947 | MGETHDR(m, M_DONTWAIT, MT_DATA); |
| 948 | if (m == NULL) { |
| 949 | error = ENOBUFS; |
| 950 | goto out0; |
| 951 | } |
| 952 | mlen = MHLEN; |
| 953 | |
| 954 | top = NULL; |
| 955 | mp = ⊤ |
| 956 | while (error == 0 && uio->uio_resid > 0) { |
| 957 | m->m_len = min(mlen, uio->uio_resid); |
| 958 | error = uiomove(mtod(m, void *), m->m_len, uio); |
| 959 | *mp = m; |
| 960 | mp = &m->m_next; |
| 961 | if (error == 0 && uio->uio_resid > 0) { |
| 962 | MGET(m, M_DONTWAIT, MT_DATA); |
| 963 | if (m == NULL) { |
| 964 | error = ENOBUFS; |
| 965 | break; |
| 966 | } |
| 967 | mlen = MLEN; |
| 968 | } |
| 969 | } |
| 970 | if (error) { |
| 971 | if (top != NULL) |
| 972 | m_freem (top); |
| 973 | ifp->if_ierrors++; |
| 974 | goto out0; |
| 975 | } |
| 976 | |
| 977 | top->m_pkthdr.len = tlen; |
| 978 | m_set_rcvif(top, ifp); |
| 979 | |
| 980 | bpf_mtap_af(ifp, dst.sa_family, top); |
| 981 | |
| 982 | s = splnet(); |
| 983 | mutex_enter(&tp->tun_lock); |
| 984 | if ((tp->tun_flags & TUN_INITED) == 0) { |
| 985 | /* Interface was destroyed */ |
| 986 | error = ENXIO; |
| 987 | goto out; |
| 988 | } |
| 989 | if (__predict_false(!pktq_enqueue(pktq, top, 0))) { |
| 990 | ifp->if_collisions++; |
| 991 | mutex_exit(&tp->tun_lock); |
| 992 | error = ENOBUFS; |
| 993 | m_freem(top); |
| 994 | goto out_nolock; |
| 995 | } |
| 996 | ifp->if_ipackets++; |
| 997 | ifp->if_ibytes += tlen; |
| 998 | out: |
| 999 | mutex_exit(&tp->tun_lock); |
| 1000 | out_nolock: |
| 1001 | splx(s); |
| 1002 | out0: |
| 1003 | return (error); |
| 1004 | } |
| 1005 | |
| 1006 | #ifdef ALTQ |
| 1007 | /* |
| 1008 | * Start packet transmission on the interface. |
| 1009 | * when the interface queue is rate-limited by ALTQ or TBR, |
| 1010 | * if_start is needed to drain packets from the queue in order |
| 1011 | * to notify readers when outgoing packets become ready. |
| 1012 | * |
| 1013 | * Should be called at splnet. |
| 1014 | */ |
| 1015 | static void |
| 1016 | tunstart(struct ifnet *ifp) |
| 1017 | { |
| 1018 | struct tun_softc *tp = ifp->if_softc; |
| 1019 | |
| 1020 | if (!ALTQ_IS_ENABLED(&ifp->if_snd) && !TBR_IS_ENABLED(&ifp->if_snd)) |
| 1021 | return; |
| 1022 | |
| 1023 | mutex_enter(&tp->tun_lock); |
| 1024 | if (!IF_IS_EMPTY(&ifp->if_snd)) { |
| 1025 | if (tp->tun_flags & TUN_RWAIT) { |
| 1026 | tp->tun_flags &= ~TUN_RWAIT; |
| 1027 | wakeup((void *)tp); |
| 1028 | } |
| 1029 | if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid) |
| 1030 | softint_schedule(tp->tun_osih); |
| 1031 | |
| 1032 | selnotify(&tp->tun_rsel, 0, 0); |
| 1033 | } |
| 1034 | mutex_exit(&tp->tun_lock); |
| 1035 | } |
| 1036 | #endif /* ALTQ */ |
| 1037 | /* |
| 1038 | * tunpoll - the poll interface, this is only useful on reads |
| 1039 | * really. The write detect always returns true, write never blocks |
| 1040 | * anyway, it either accepts the packet or drops it. |
| 1041 | */ |
| 1042 | int |
| 1043 | tunpoll(dev_t dev, int events, struct lwp *l) |
| 1044 | { |
| 1045 | struct tun_softc *tp; |
| 1046 | struct ifnet *ifp; |
| 1047 | int s, revents = 0; |
| 1048 | |
| 1049 | s = splnet(); |
| 1050 | tp = tun_find_unit(dev); |
| 1051 | |
| 1052 | /* interface was "destroyed" already */ |
| 1053 | if (tp == NULL) |
| 1054 | goto out_nolock; |
| 1055 | |
| 1056 | ifp = &tp->tun_if; |
| 1057 | |
| 1058 | TUNDEBUG("%s: tunpoll\n" , ifp->if_xname); |
| 1059 | |
| 1060 | if (events & (POLLIN | POLLRDNORM)) { |
| 1061 | if (!IFQ_IS_EMPTY(&ifp->if_snd)) { |
| 1062 | TUNDEBUG("%s: tunpoll q=%d\n" , ifp->if_xname, |
| 1063 | ifp->if_snd.ifq_len); |
| 1064 | revents |= events & (POLLIN | POLLRDNORM); |
| 1065 | } else { |
| 1066 | TUNDEBUG("%s: tunpoll waiting\n" , ifp->if_xname); |
| 1067 | selrecord(l, &tp->tun_rsel); |
| 1068 | } |
| 1069 | } |
| 1070 | |
| 1071 | if (events & (POLLOUT | POLLWRNORM)) |
| 1072 | revents |= events & (POLLOUT | POLLWRNORM); |
| 1073 | |
| 1074 | mutex_exit(&tp->tun_lock); |
| 1075 | out_nolock: |
| 1076 | splx(s); |
| 1077 | return (revents); |
| 1078 | } |
| 1079 | |
| 1080 | static void |
| 1081 | filt_tunrdetach(struct knote *kn) |
| 1082 | { |
| 1083 | struct tun_softc *tp = kn->kn_hook; |
| 1084 | int s; |
| 1085 | |
| 1086 | s = splnet(); |
| 1087 | SLIST_REMOVE(&tp->tun_rsel.sel_klist, kn, knote, kn_selnext); |
| 1088 | splx(s); |
| 1089 | } |
| 1090 | |
| 1091 | static int |
| 1092 | filt_tunread(struct knote *kn, long hint) |
| 1093 | { |
| 1094 | struct tun_softc *tp = kn->kn_hook; |
| 1095 | struct ifnet *ifp = &tp->tun_if; |
| 1096 | struct mbuf *m; |
| 1097 | int s; |
| 1098 | |
| 1099 | s = splnet(); |
| 1100 | IF_POLL(&ifp->if_snd, m); |
| 1101 | if (m == NULL) { |
| 1102 | splx(s); |
| 1103 | return (0); |
| 1104 | } |
| 1105 | |
| 1106 | for (kn->kn_data = 0; m != NULL; m = m->m_next) |
| 1107 | kn->kn_data += m->m_len; |
| 1108 | |
| 1109 | splx(s); |
| 1110 | return (1); |
| 1111 | } |
| 1112 | |
| 1113 | static const struct filterops tunread_filtops = |
| 1114 | { 1, NULL, filt_tunrdetach, filt_tunread }; |
| 1115 | |
| 1116 | static const struct filterops tun_seltrue_filtops = |
| 1117 | { 1, NULL, filt_tunrdetach, filt_seltrue }; |
| 1118 | |
| 1119 | int |
| 1120 | tunkqfilter(dev_t dev, struct knote *kn) |
| 1121 | { |
| 1122 | struct tun_softc *tp; |
| 1123 | struct klist *klist; |
| 1124 | int rv = 0, s; |
| 1125 | |
| 1126 | s = splnet(); |
| 1127 | tp = tun_find_unit(dev); |
| 1128 | if (tp == NULL) |
| 1129 | goto out_nolock; |
| 1130 | |
| 1131 | switch (kn->kn_filter) { |
| 1132 | case EVFILT_READ: |
| 1133 | klist = &tp->tun_rsel.sel_klist; |
| 1134 | kn->kn_fop = &tunread_filtops; |
| 1135 | break; |
| 1136 | |
| 1137 | case EVFILT_WRITE: |
| 1138 | klist = &tp->tun_rsel.sel_klist; |
| 1139 | kn->kn_fop = &tun_seltrue_filtops; |
| 1140 | break; |
| 1141 | |
| 1142 | default: |
| 1143 | rv = EINVAL; |
| 1144 | goto out; |
| 1145 | } |
| 1146 | |
| 1147 | kn->kn_hook = tp; |
| 1148 | |
| 1149 | SLIST_INSERT_HEAD(klist, kn, kn_selnext); |
| 1150 | |
| 1151 | out: |
| 1152 | mutex_exit(&tp->tun_lock); |
| 1153 | out_nolock: |
| 1154 | splx(s); |
| 1155 | return (rv); |
| 1156 | } |
| 1157 | |
| 1158 | /* |
| 1159 | * Module infrastructure |
| 1160 | */ |
| 1161 | #include "if_module.h" |
| 1162 | |
| 1163 | IF_MODULE(MODULE_CLASS_DRIVER, tun, "" ) |
| 1164 | |