| 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: src/sys/net/if_tun.c,v 1.74.2.8 2002/02/13 00:43:11 dillon Exp $ |
| 17 | * $DragonFly: src/sys/net/tun/if_tun.c,v 1.37 2008/06/05 18:06:32 swildner Exp $ |
| 18 | */ |
| 19 | |
| 20 | #include "opt_atalk.h" |
| 21 | #include "opt_inet.h" |
| 22 | #include "opt_inet6.h" |
| 23 | #include "opt_ipx.h" |
| 24 | |
| 25 | #include <sys/param.h> |
| 26 | #include <sys/proc.h> |
| 27 | #include <sys/priv.h> |
| 28 | #include <sys/systm.h> |
| 29 | #include <sys/mbuf.h> |
| 30 | #include <sys/socket.h> |
| 31 | #include <sys/conf.h> |
| 32 | #include <sys/device.h> |
| 33 | #include <sys/filio.h> |
| 34 | #include <sys/sockio.h> |
| 35 | #include <sys/thread2.h> |
| 36 | #include <sys/ttycom.h> |
| 37 | #include <sys/poll.h> |
| 38 | #include <sys/signalvar.h> |
| 39 | #include <sys/filedesc.h> |
| 40 | #include <sys/kernel.h> |
| 41 | #include <sys/sysctl.h> |
| 42 | #include <sys/uio.h> |
| 43 | #include <sys/vnode.h> |
| 44 | #include <sys/malloc.h> |
| 45 | |
| 46 | #include <net/if.h> |
| 47 | #include <net/if_types.h> |
| 48 | #include <net/ifq_var.h> |
| 49 | #include <net/netisr.h> |
| 50 | #include <net/route.h> |
| 51 | #include <sys/devfs.h> |
| 52 | |
| 53 | #ifdef INET |
| 54 | #include <netinet/in.h> |
| 55 | #endif |
| 56 | |
| 57 | #include <net/bpf.h> |
| 58 | |
| 59 | #include "if_tunvar.h" |
| 60 | #include "if_tun.h" |
| 61 | |
| 62 | static MALLOC_DEFINE(M_TUN, "tun", "Tunnel Interface"); |
| 63 | |
| 64 | static void tunattach (void *); |
| 65 | PSEUDO_SET(tunattach, if_tun); |
| 66 | |
| 67 | static void tuncreate (cdev_t dev); |
| 68 | |
| 69 | #define TUNDEBUG if (tundebug) if_printf |
| 70 | static int tundebug = 0; |
| 71 | SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, ""); |
| 72 | |
| 73 | static int tunoutput (struct ifnet *, struct mbuf *, struct sockaddr *, |
| 74 | struct rtentry *rt); |
| 75 | static int tunifioctl (struct ifnet *, u_long, caddr_t, struct ucred *); |
| 76 | static int tuninit (struct ifnet *); |
| 77 | static void tunstart(struct ifnet *); |
| 78 | |
| 79 | static d_open_t tunopen; |
| 80 | static d_close_t tunclose; |
| 81 | static d_read_t tunread; |
| 82 | static d_write_t tunwrite; |
| 83 | static d_ioctl_t tunioctl; |
| 84 | static d_poll_t tunpoll; |
| 85 | |
| 86 | static d_clone_t tunclone; |
| 87 | DEVFS_DECLARE_CLONE_BITMAP(tun); |
| 88 | #define TUN_PREALLOCATED_UNITS 4 |
| 89 | |
| 90 | #define CDEV_MAJOR 52 |
| 91 | static struct dev_ops tun_ops = { |
| 92 | { "tun", CDEV_MAJOR, 0 }, |
| 93 | .d_open = tunopen, |
| 94 | .d_close = tunclose, |
| 95 | .d_read = tunread, |
| 96 | .d_write = tunwrite, |
| 97 | .d_ioctl = tunioctl, |
| 98 | .d_poll = tunpoll, |
| 99 | }; |
| 100 | |
| 101 | static void |
| 102 | tunattach(void *dummy) |
| 103 | { |
| 104 | int i; |
| 105 | make_autoclone_dev(&tun_ops, &DEVFS_CLONE_BITMAP(tun), |
| 106 | tunclone, UID_UUCP, GID_DIALER, 0600, "tun"); |
| 107 | for (i = 0; i < TUN_PREALLOCATED_UNITS; i++) { |
| 108 | make_dev(&tun_ops, i, UID_UUCP, GID_DIALER, 0600, "tun%d", i); |
| 109 | devfs_clone_bitmap_set(&DEVFS_CLONE_BITMAP(tun), i); |
| 110 | } |
| 111 | /* Doesn't need uninit because unloading is not possible, see PSEUDO_SET */ |
| 112 | } |
| 113 | |
| 114 | static int |
| 115 | tunclone(struct dev_clone_args *ap) |
| 116 | { |
| 117 | int unit; |
| 118 | |
| 119 | unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(tun), 0); |
| 120 | ap->a_dev = make_only_dev(&tun_ops, unit, UID_UUCP, GID_DIALER, 0600, |
| 121 | "tun%d", unit); |
| 122 | |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | static void |
| 127 | tuncreate(cdev_t dev) |
| 128 | { |
| 129 | struct tun_softc *sc; |
| 130 | struct ifnet *ifp; |
| 131 | |
| 132 | #if 0 |
| 133 | dev = make_dev(&tun_ops, minor(dev), |
| 134 | UID_UUCP, GID_DIALER, 0600, "tun%d", lminor(dev)); |
| 135 | #endif |
| 136 | |
| 137 | MALLOC(sc, struct tun_softc *, sizeof(*sc), M_TUN, M_WAITOK | M_ZERO); |
| 138 | sc->tun_flags = TUN_INITED; |
| 139 | |
| 140 | ifp = &sc->tun_if; |
| 141 | if_initname(ifp, "tun", lminor(dev)); |
| 142 | ifp->if_mtu = TUNMTU; |
| 143 | ifp->if_ioctl = tunifioctl; |
| 144 | ifp->if_output = tunoutput; |
| 145 | ifp->if_start = tunstart; |
| 146 | ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; |
| 147 | ifp->if_type = IFT_PPP; |
| 148 | ifq_set_maxlen(&ifp->if_snd, ifqmaxlen); |
| 149 | ifq_set_ready(&ifp->if_snd); |
| 150 | ifp->if_softc = sc; |
| 151 | if_attach(ifp, NULL); |
| 152 | bpfattach(ifp, DLT_NULL, sizeof(u_int)); |
| 153 | dev->si_drv1 = sc; |
| 154 | } |
| 155 | |
| 156 | /* |
| 157 | * tunnel open - must be superuser & the device must be |
| 158 | * configured in |
| 159 | */ |
| 160 | static int |
| 161 | tunopen(struct dev_open_args *ap) |
| 162 | { |
| 163 | cdev_t dev = ap->a_head.a_dev; |
| 164 | struct ifnet *ifp; |
| 165 | struct tun_softc *tp; |
| 166 | int error; |
| 167 | |
| 168 | if ((error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) != 0) |
| 169 | return (error); |
| 170 | |
| 171 | tp = dev->si_drv1; |
| 172 | if (!tp) { |
| 173 | tuncreate(dev); |
| 174 | tp = dev->si_drv1; |
| 175 | } |
| 176 | if (tp->tun_flags & TUN_OPEN) |
| 177 | return EBUSY; |
| 178 | tp->tun_pid = curproc->p_pid; |
| 179 | ifp = &tp->tun_if; |
| 180 | tp->tun_flags |= TUN_OPEN; |
| 181 | TUNDEBUG(ifp, "open\n"); |
| 182 | return (0); |
| 183 | } |
| 184 | |
| 185 | /* |
| 186 | * tunclose - close the device - mark i/f down & delete |
| 187 | * routing info |
| 188 | */ |
| 189 | static int |
| 190 | tunclose(struct dev_close_args *ap) |
| 191 | { |
| 192 | cdev_t dev = ap->a_head.a_dev; |
| 193 | struct tun_softc *tp; |
| 194 | struct ifnet *ifp; |
| 195 | |
| 196 | tp = dev->si_drv1; |
| 197 | ifp = &tp->tun_if; |
| 198 | |
| 199 | tp->tun_flags &= ~TUN_OPEN; |
| 200 | tp->tun_pid = 0; |
| 201 | |
| 202 | /* Junk all pending output. */ |
| 203 | ifq_purge(&ifp->if_snd); |
| 204 | |
| 205 | if (ifp->if_flags & IFF_UP) |
| 206 | if_down(ifp); |
| 207 | ifp->if_flags &= ~IFF_RUNNING; |
| 208 | if_purgeaddrs_nolink(ifp); |
| 209 | |
| 210 | funsetown(tp->tun_sigio); |
| 211 | selwakeup(&tp->tun_rsel); |
| 212 | |
| 213 | TUNDEBUG(ifp, "closed\n"); |
| 214 | #if 0 |
| 215 | if (dev->si_uminor >= TUN_PREALLOCATED_UNITS) { |
| 216 | devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(tun), dev->si_uminor); |
| 217 | } |
| 218 | #endif |
| 219 | return (0); |
| 220 | } |
| 221 | |
| 222 | static int |
| 223 | tuninit(struct ifnet *ifp) |
| 224 | { |
| 225 | struct tun_softc *tp = ifp->if_softc; |
| 226 | struct ifaddr_container *ifac; |
| 227 | int error = 0; |
| 228 | |
| 229 | TUNDEBUG(ifp, "tuninit\n"); |
| 230 | |
| 231 | ifp->if_flags |= IFF_UP | IFF_RUNNING; |
| 232 | getmicrotime(&ifp->if_lastchange); |
| 233 | |
| 234 | TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { |
| 235 | struct ifaddr *ifa = ifac->ifa; |
| 236 | |
| 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 | #endif |
| 250 | } |
| 251 | } |
| 252 | return (error); |
| 253 | } |
| 254 | |
| 255 | /* |
| 256 | * Process an ioctl request. |
| 257 | * |
| 258 | * MPSAFE |
| 259 | */ |
| 260 | int |
| 261 | tunifioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) |
| 262 | { |
| 263 | struct ifreq *ifr = (struct ifreq *)data; |
| 264 | struct tun_softc *tp = ifp->if_softc; |
| 265 | struct ifstat *ifs; |
| 266 | int error = 0; |
| 267 | |
| 268 | switch(cmd) { |
| 269 | case SIOCGIFSTATUS: |
| 270 | ifs = (struct ifstat *)data; |
| 271 | if (tp->tun_pid) |
| 272 | ksprintf(ifs->ascii + strlen(ifs->ascii), |
| 273 | "\tOpened by PID %d\n", tp->tun_pid); |
| 274 | break; |
| 275 | case SIOCSIFADDR: |
| 276 | error = tuninit(ifp); |
| 277 | TUNDEBUG(ifp, "address set, error=%d\n", error); |
| 278 | break; |
| 279 | case SIOCSIFDSTADDR: |
| 280 | error = tuninit(ifp); |
| 281 | TUNDEBUG(ifp, "destination address set, error=%d\n", error); |
| 282 | break; |
| 283 | case SIOCSIFMTU: |
| 284 | ifp->if_mtu = ifr->ifr_mtu; |
| 285 | TUNDEBUG(ifp, "mtu set\n"); |
| 286 | break; |
| 287 | case SIOCSIFFLAGS: |
| 288 | case SIOCADDMULTI: |
| 289 | case SIOCDELMULTI: |
| 290 | break; |
| 291 | default: |
| 292 | error = EINVAL; |
| 293 | } |
| 294 | return (error); |
| 295 | } |
| 296 | |
| 297 | /* |
| 298 | * tunoutput - queue packets from higher level ready to put out. |
| 299 | * |
| 300 | * MPSAFE |
| 301 | */ |
| 302 | static int |
| 303 | tunoutput_serialized(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, |
| 304 | struct rtentry *rt) |
| 305 | { |
| 306 | struct tun_softc *tp = ifp->if_softc; |
| 307 | int error; |
| 308 | struct altq_pktattr pktattr; |
| 309 | |
| 310 | TUNDEBUG(ifp, "tunoutput\n"); |
| 311 | |
| 312 | if ((tp->tun_flags & TUN_READY) != TUN_READY) { |
| 313 | TUNDEBUG(ifp, "not ready 0%o\n", tp->tun_flags); |
| 314 | m_freem (m0); |
| 315 | return EHOSTDOWN; |
| 316 | } |
| 317 | |
| 318 | /* |
| 319 | * if the queueing discipline needs packet classification, |
| 320 | * do it before prepending link headers. |
| 321 | */ |
| 322 | ifq_classify(&ifp->if_snd, m0, dst->sa_family, &pktattr); |
| 323 | |
| 324 | /* BPF write needs to be handled specially */ |
| 325 | if (dst->sa_family == AF_UNSPEC) { |
| 326 | dst->sa_family = *(mtod(m0, int *)); |
| 327 | m0->m_len -= sizeof(int); |
| 328 | m0->m_pkthdr.len -= sizeof(int); |
| 329 | m0->m_data += sizeof(int); |
| 330 | } |
| 331 | |
| 332 | if (ifp->if_bpf) { |
| 333 | /* |
| 334 | * We need to prepend the address family as |
| 335 | * a four byte field. |
| 336 | */ |
| 337 | uint32_t af = dst->sa_family; |
| 338 | |
| 339 | bpf_ptap(ifp->if_bpf, m0, &af, sizeof(af)); |
| 340 | } |
| 341 | |
| 342 | /* prepend sockaddr? this may abort if the mbuf allocation fails */ |
| 343 | if (tp->tun_flags & TUN_LMODE) { |
| 344 | /* allocate space for sockaddr */ |
| 345 | M_PREPEND(m0, dst->sa_len, MB_DONTWAIT); |
| 346 | |
| 347 | /* if allocation failed drop packet */ |
| 348 | if (m0 == NULL){ |
| 349 | IF_DROP(&ifp->if_snd); |
| 350 | ifp->if_oerrors++; |
| 351 | return (ENOBUFS); |
| 352 | } else { |
| 353 | bcopy(dst, m0->m_data, dst->sa_len); |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | if (tp->tun_flags & TUN_IFHEAD) { |
| 358 | /* Prepend the address family */ |
| 359 | M_PREPEND(m0, 4, MB_DONTWAIT); |
| 360 | |
| 361 | /* if allocation failed drop packet */ |
| 362 | if (m0 == NULL){ |
| 363 | IF_DROP(&ifp->if_snd); |
| 364 | ifp->if_oerrors++; |
| 365 | return ENOBUFS; |
| 366 | } else |
| 367 | *(u_int32_t *)m0->m_data = htonl(dst->sa_family); |
| 368 | } else { |
| 369 | #ifdef INET |
| 370 | if (dst->sa_family != AF_INET) |
| 371 | #endif |
| 372 | { |
| 373 | m_freem(m0); |
| 374 | return EAFNOSUPPORT; |
| 375 | } |
| 376 | } |
| 377 | |
| 378 | error = ifq_handoff(ifp, m0, &pktattr); |
| 379 | if (error) { |
| 380 | ifp->if_collisions++; |
| 381 | } else { |
| 382 | ifp->if_opackets++; |
| 383 | if (tp->tun_flags & TUN_RWAIT) { |
| 384 | tp->tun_flags &= ~TUN_RWAIT; |
| 385 | wakeup((caddr_t)tp); |
| 386 | } |
| 387 | get_mplock(); |
| 388 | if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio) |
| 389 | pgsigio(tp->tun_sigio, SIGIO, 0); |
| 390 | selwakeup(&tp->tun_rsel); |
| 391 | rel_mplock(); |
| 392 | } |
| 393 | return (error); |
| 394 | } |
| 395 | |
| 396 | static int |
| 397 | tunoutput(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, |
| 398 | struct rtentry *rt) |
| 399 | { |
| 400 | int error; |
| 401 | |
| 402 | ifnet_serialize_all(ifp); |
| 403 | error = tunoutput_serialized(ifp, m0, dst, rt); |
| 404 | ifnet_deserialize_all(ifp); |
| 405 | |
| 406 | return error; |
| 407 | } |
| 408 | |
| 409 | /* |
| 410 | * the ops interface is now pretty minimal. |
| 411 | */ |
| 412 | static int |
| 413 | tunioctl(struct dev_ioctl_args *ap) |
| 414 | { |
| 415 | cdev_t dev = ap->a_head.a_dev; |
| 416 | struct tun_softc *tp = dev->si_drv1; |
| 417 | struct tuninfo *tunp; |
| 418 | |
| 419 | switch (ap->a_cmd) { |
| 420 | case TUNSIFINFO: |
| 421 | tunp = (struct tuninfo *)ap->a_data; |
| 422 | if (tunp->mtu < IF_MINMTU) |
| 423 | return (EINVAL); |
| 424 | tp->tun_if.if_mtu = tunp->mtu; |
| 425 | tp->tun_if.if_type = tunp->type; |
| 426 | tp->tun_if.if_baudrate = tunp->baudrate; |
| 427 | break; |
| 428 | case TUNGIFINFO: |
| 429 | tunp = (struct tuninfo *)ap->a_data; |
| 430 | tunp->mtu = tp->tun_if.if_mtu; |
| 431 | tunp->type = tp->tun_if.if_type; |
| 432 | tunp->baudrate = tp->tun_if.if_baudrate; |
| 433 | break; |
| 434 | case TUNSDEBUG: |
| 435 | tundebug = *(int *)ap->a_data; |
| 436 | break; |
| 437 | case TUNGDEBUG: |
| 438 | *(int *)ap->a_data = tundebug; |
| 439 | break; |
| 440 | case TUNSLMODE: |
| 441 | if (*(int *)ap->a_data) { |
| 442 | tp->tun_flags |= TUN_LMODE; |
| 443 | tp->tun_flags &= ~TUN_IFHEAD; |
| 444 | } else |
| 445 | tp->tun_flags &= ~TUN_LMODE; |
| 446 | break; |
| 447 | case TUNSIFHEAD: |
| 448 | if (*(int *)ap->a_data) { |
| 449 | tp->tun_flags |= TUN_IFHEAD; |
| 450 | tp->tun_flags &= ~TUN_LMODE; |
| 451 | } else |
| 452 | tp->tun_flags &= ~TUN_IFHEAD; |
| 453 | break; |
| 454 | case TUNGIFHEAD: |
| 455 | *(int *)ap->a_data = (tp->tun_flags & TUN_IFHEAD) ? 1 : 0; |
| 456 | break; |
| 457 | case TUNSIFMODE: |
| 458 | /* deny this if UP */ |
| 459 | if (tp->tun_if.if_flags & IFF_UP) |
| 460 | return(EBUSY); |
| 461 | |
| 462 | switch (*(int *)ap->a_data & ~IFF_MULTICAST) { |
| 463 | case IFF_POINTOPOINT: |
| 464 | case IFF_BROADCAST: |
| 465 | tp->tun_if.if_flags &= ~(IFF_BROADCAST|IFF_POINTOPOINT); |
| 466 | tp->tun_if.if_flags |= *(int *)ap->a_data; |
| 467 | break; |
| 468 | default: |
| 469 | return(EINVAL); |
| 470 | } |
| 471 | break; |
| 472 | case TUNSIFPID: |
| 473 | tp->tun_pid = curproc->p_pid; |
| 474 | break; |
| 475 | case FIOASYNC: |
| 476 | if (*(int *)ap->a_data) |
| 477 | tp->tun_flags |= TUN_ASYNC; |
| 478 | else |
| 479 | tp->tun_flags &= ~TUN_ASYNC; |
| 480 | break; |
| 481 | case FIONREAD: |
| 482 | if (!ifq_is_empty(&tp->tun_if.if_snd)) { |
| 483 | struct mbuf *mb; |
| 484 | |
| 485 | mb = ifq_poll(&tp->tun_if.if_snd); |
| 486 | for( *(int *)ap->a_data = 0; mb != 0; mb = mb->m_next) |
| 487 | *(int *)ap->a_data += mb->m_len; |
| 488 | } else { |
| 489 | *(int *)ap->a_data = 0; |
| 490 | } |
| 491 | break; |
| 492 | case FIOSETOWN: |
| 493 | return (fsetown(*(int *)ap->a_data, &tp->tun_sigio)); |
| 494 | |
| 495 | case FIOGETOWN: |
| 496 | *(int *)ap->a_data = fgetown(tp->tun_sigio); |
| 497 | return (0); |
| 498 | |
| 499 | /* This is deprecated, FIOSETOWN should be used instead. */ |
| 500 | case TIOCSPGRP: |
| 501 | return (fsetown(-(*(int *)ap->a_data), &tp->tun_sigio)); |
| 502 | |
| 503 | /* This is deprecated, FIOGETOWN should be used instead. */ |
| 504 | case TIOCGPGRP: |
| 505 | *(int *)ap->a_data = -fgetown(tp->tun_sigio); |
| 506 | return (0); |
| 507 | |
| 508 | default: |
| 509 | return (ENOTTY); |
| 510 | } |
| 511 | return (0); |
| 512 | } |
| 513 | |
| 514 | /* |
| 515 | * The ops read interface - reads a packet at a time, or at |
| 516 | * least as much of a packet as can be read. |
| 517 | */ |
| 518 | static int |
| 519 | tunread(struct dev_read_args *ap) |
| 520 | { |
| 521 | cdev_t dev = ap->a_head.a_dev; |
| 522 | struct uio *uio = ap->a_uio; |
| 523 | struct tun_softc *tp = dev->si_drv1; |
| 524 | struct ifnet *ifp = &tp->tun_if; |
| 525 | struct mbuf *m0; |
| 526 | int error=0, len; |
| 527 | |
| 528 | TUNDEBUG(ifp, "read\n"); |
| 529 | if ((tp->tun_flags & TUN_READY) != TUN_READY) { |
| 530 | TUNDEBUG(ifp, "not ready 0%o\n", tp->tun_flags); |
| 531 | return EHOSTDOWN; |
| 532 | } |
| 533 | |
| 534 | tp->tun_flags &= ~TUN_RWAIT; |
| 535 | |
| 536 | ifnet_serialize_all(ifp); |
| 537 | |
| 538 | while ((m0 = ifq_dequeue(&ifp->if_snd, NULL)) == NULL) { |
| 539 | if (ap->a_ioflag & IO_NDELAY) { |
| 540 | ifnet_deserialize_all(ifp); |
| 541 | return EWOULDBLOCK; |
| 542 | } |
| 543 | tp->tun_flags |= TUN_RWAIT; |
| 544 | ifnet_deserialize_all(ifp); |
| 545 | if ((error = tsleep(tp, PCATCH, "tunread", 0)) != 0) |
| 546 | return error; |
| 547 | ifnet_serialize_all(ifp); |
| 548 | } |
| 549 | |
| 550 | ifnet_deserialize_all(ifp); |
| 551 | |
| 552 | while (m0 && uio->uio_resid > 0 && error == 0) { |
| 553 | len = (int)szmin(uio->uio_resid, m0->m_len); |
| 554 | if (len != 0) |
| 555 | error = uiomove(mtod(m0, caddr_t), (size_t)len, uio); |
| 556 | m0 = m_free(m0); |
| 557 | } |
| 558 | |
| 559 | if (m0) { |
| 560 | TUNDEBUG(ifp, "Dropping mbuf\n"); |
| 561 | m_freem(m0); |
| 562 | } |
| 563 | return error; |
| 564 | } |
| 565 | |
| 566 | /* |
| 567 | * the ops write interface - an atomic write is a packet - or else! |
| 568 | */ |
| 569 | static int |
| 570 | tunwrite(struct dev_write_args *ap) |
| 571 | { |
| 572 | cdev_t dev = ap->a_head.a_dev; |
| 573 | struct uio *uio = ap->a_uio; |
| 574 | struct tun_softc *tp = dev->si_drv1; |
| 575 | struct ifnet *ifp = &tp->tun_if; |
| 576 | struct mbuf *top, **mp, *m; |
| 577 | int error=0; |
| 578 | size_t tlen, mlen; |
| 579 | uint32_t family; |
| 580 | int isr; |
| 581 | |
| 582 | TUNDEBUG(ifp, "tunwrite\n"); |
| 583 | |
| 584 | if (uio->uio_resid == 0) |
| 585 | return 0; |
| 586 | |
| 587 | if (uio->uio_resid > TUNMRU) { |
| 588 | TUNDEBUG(ifp, "len=%d!\n", uio->uio_resid); |
| 589 | return EIO; |
| 590 | } |
| 591 | tlen = uio->uio_resid; |
| 592 | |
| 593 | /* get a header mbuf */ |
| 594 | MGETHDR(m, MB_DONTWAIT, MT_DATA); |
| 595 | if (m == NULL) |
| 596 | return ENOBUFS; |
| 597 | mlen = MHLEN; |
| 598 | |
| 599 | top = 0; |
| 600 | mp = ⊤ |
| 601 | while (error == 0 && uio->uio_resid > 0) { |
| 602 | m->m_len = (int)szmin(mlen, uio->uio_resid); |
| 603 | error = uiomove(mtod (m, caddr_t), (size_t)m->m_len, uio); |
| 604 | *mp = m; |
| 605 | mp = &m->m_next; |
| 606 | if (uio->uio_resid > 0) { |
| 607 | MGET (m, MB_DONTWAIT, MT_DATA); |
| 608 | if (m == 0) { |
| 609 | error = ENOBUFS; |
| 610 | break; |
| 611 | } |
| 612 | mlen = MLEN; |
| 613 | } |
| 614 | } |
| 615 | if (error) { |
| 616 | if (top) |
| 617 | m_freem (top); |
| 618 | ifp->if_ierrors++; |
| 619 | return error; |
| 620 | } |
| 621 | |
| 622 | top->m_pkthdr.len = (int)tlen; |
| 623 | top->m_pkthdr.rcvif = ifp; |
| 624 | |
| 625 | if (ifp->if_bpf) { |
| 626 | if (tp->tun_flags & TUN_IFHEAD) { |
| 627 | /* |
| 628 | * Conveniently, we already have a 4-byte address |
| 629 | * family prepended to our packet ! |
| 630 | * Inconveniently, it's in the wrong byte order ! |
| 631 | */ |
| 632 | if ((top = m_pullup(top, sizeof(family))) == NULL) |
| 633 | return ENOBUFS; |
| 634 | *mtod(top, u_int32_t *) = |
| 635 | ntohl(*mtod(top, u_int32_t *)); |
| 636 | bpf_mtap(ifp->if_bpf, top); |
| 637 | *mtod(top, u_int32_t *) = |
| 638 | htonl(*mtod(top, u_int32_t *)); |
| 639 | } else { |
| 640 | /* |
| 641 | * We need to prepend the address family as |
| 642 | * a four byte field. |
| 643 | */ |
| 644 | static const uint32_t af = AF_INET; |
| 645 | |
| 646 | bpf_ptap(ifp->if_bpf, top, &af, sizeof(af)); |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | if (tp->tun_flags & TUN_IFHEAD) { |
| 651 | if (top->m_len < sizeof(family) && |
| 652 | (top = m_pullup(top, sizeof(family))) == NULL) |
| 653 | return ENOBUFS; |
| 654 | family = ntohl(*mtod(top, u_int32_t *)); |
| 655 | m_adj(top, sizeof(family)); |
| 656 | } else |
| 657 | family = AF_INET; |
| 658 | |
| 659 | ifp->if_ibytes += top->m_pkthdr.len; |
| 660 | ifp->if_ipackets++; |
| 661 | |
| 662 | switch (family) { |
| 663 | #ifdef INET |
| 664 | case AF_INET: |
| 665 | isr = NETISR_IP; |
| 666 | break; |
| 667 | #endif |
| 668 | #ifdef INET6 |
| 669 | case AF_INET6: |
| 670 | isr = NETISR_IPV6; |
| 671 | break; |
| 672 | #endif |
| 673 | #ifdef IPX |
| 674 | case AF_IPX: |
| 675 | isr = NETISR_IPX; |
| 676 | break; |
| 677 | #endif |
| 678 | #ifdef NETATALK |
| 679 | case AF_APPLETALK: |
| 680 | isr = NETISR_ATALK2; |
| 681 | break; |
| 682 | #endif |
| 683 | default: |
| 684 | m_freem(m); |
| 685 | return (EAFNOSUPPORT); |
| 686 | } |
| 687 | |
| 688 | netisr_dispatch(isr, top); |
| 689 | return (0); |
| 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(struct dev_poll_args *ap) |
| 699 | { |
| 700 | cdev_t dev = ap->a_head.a_dev; |
| 701 | struct tun_softc *tp = dev->si_drv1; |
| 702 | struct ifnet *ifp = &tp->tun_if; |
| 703 | int revents = 0; |
| 704 | |
| 705 | TUNDEBUG(ifp, "tunpoll\n"); |
| 706 | |
| 707 | ifnet_serialize_all(ifp); |
| 708 | |
| 709 | if (ap->a_events & (POLLIN | POLLRDNORM)) { |
| 710 | if (!ifq_is_empty(&ifp->if_snd)) { |
| 711 | TUNDEBUG(ifp, "tunpoll q=%d\n", ifp->if_snd.ifq_len); |
| 712 | revents |= ap->a_events & (POLLIN | POLLRDNORM); |
| 713 | } else { |
| 714 | TUNDEBUG(ifp, "tunpoll waiting\n"); |
| 715 | selrecord(curthread, &tp->tun_rsel); |
| 716 | } |
| 717 | } |
| 718 | if (ap->a_events & (POLLOUT | POLLWRNORM)) |
| 719 | revents |= ap->a_events & (POLLOUT | POLLWRNORM); |
| 720 | |
| 721 | ifnet_deserialize_all(ifp); |
| 722 | ap->a_events = revents; |
| 723 | return(0); |
| 724 | } |
| 725 | |
| 726 | /* |
| 727 | * Start packet transmission on the interface. |
| 728 | * when the interface queue is rate-limited by ALTQ, |
| 729 | * if_start is needed to drain packets from the queue in order |
| 730 | * to notify readers when outgoing packets become ready. |
| 731 | */ |
| 732 | static void |
| 733 | tunstart(struct ifnet *ifp) |
| 734 | { |
| 735 | struct tun_softc *tp = ifp->if_softc; |
| 736 | struct mbuf *m; |
| 737 | |
| 738 | if (!ifq_is_enabled(&ifp->if_snd)) |
| 739 | return; |
| 740 | |
| 741 | m = ifq_poll(&ifp->if_snd); |
| 742 | if (m != NULL) { |
| 743 | if (tp->tun_flags & TUN_RWAIT) { |
| 744 | tp->tun_flags &= ~TUN_RWAIT; |
| 745 | wakeup((caddr_t)tp); |
| 746 | } |
| 747 | if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio) |
| 748 | pgsigio(tp->tun_sigio, SIGIO, 0); |
| 749 | selwakeup(&tp->tun_rsel); |
| 750 | } |
| 751 | } |