| 1 | /* |
| 2 | * Copyright (C) 1999-2000 by Maksim Yevmenkin <m_evmenkin@yahoo.com> |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 24 | * SUCH DAMAGE. |
| 25 | * |
| 26 | * BASED ON: |
| 27 | * ------------------------------------------------------------------------- |
| 28 | * |
| 29 | * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk> |
| 30 | * Nottingham University 1987. |
| 31 | */ |
| 32 | |
| 33 | /* |
| 34 | * $FreeBSD: src/sys/net/if_tap.c,v 1.3.2.3 2002/04/14 21:41:48 luigi Exp $ |
| 35 | * $DragonFly: src/sys/net/tap/if_tap.c,v 1.29 2006/09/10 01:26:40 dillon Exp $ |
| 36 | * $Id: if_tap.c,v 0.21 2000/07/23 21:46:02 max Exp $ |
| 37 | */ |
| 38 | |
| 39 | #include "opt_inet.h" |
| 40 | |
| 41 | #include <sys/param.h> |
| 42 | #include <sys/conf.h> |
| 43 | #include <sys/device.h> |
| 44 | #include <sys/filedesc.h> |
| 45 | #include <sys/filio.h> |
| 46 | #include <sys/kernel.h> |
| 47 | #include <sys/malloc.h> |
| 48 | #include <sys/mbuf.h> |
| 49 | #include <sys/poll.h> |
| 50 | #include <sys/proc.h> |
| 51 | #include <sys/signalvar.h> |
| 52 | #include <sys/socket.h> |
| 53 | #include <sys/sockio.h> |
| 54 | #include <sys/sysctl.h> |
| 55 | #include <sys/systm.h> |
| 56 | #include <sys/thread2.h> |
| 57 | #include <sys/ttycom.h> |
| 58 | #include <sys/uio.h> |
| 59 | #include <sys/vnode.h> |
| 60 | #include <sys/serialize.h> |
| 61 | |
| 62 | #include <net/bpf.h> |
| 63 | #include <net/ethernet.h> |
| 64 | #include <net/if.h> |
| 65 | #include <net/ifq_var.h> |
| 66 | #include <net/if_arp.h> |
| 67 | #include <net/route.h> |
| 68 | |
| 69 | #include <netinet/in.h> |
| 70 | |
| 71 | #include "if_tapvar.h" |
| 72 | #include "if_tap.h" |
| 73 | |
| 74 | |
| 75 | #define CDEV_NAME "tap" |
| 76 | #define CDEV_MAJOR 149 |
| 77 | #define TAPDEBUG if (tapdebug) if_printf |
| 78 | |
| 79 | #define TAP "tap" |
| 80 | #define VMNET "vmnet" |
| 81 | #define VMNET_DEV_MASK 0x00010000 |
| 82 | |
| 83 | /* module */ |
| 84 | static int tapmodevent (module_t, int, void *); |
| 85 | |
| 86 | /* device */ |
| 87 | static void tapcreate (cdev_t); |
| 88 | |
| 89 | /* network interface */ |
| 90 | static void tapifstart (struct ifnet *); |
| 91 | static int tapifioctl (struct ifnet *, u_long, caddr_t, |
| 92 | struct ucred *); |
| 93 | static void tapifinit (void *); |
| 94 | |
| 95 | /* character device */ |
| 96 | static d_open_t tapopen; |
| 97 | static d_close_t tapclose; |
| 98 | static d_read_t tapread; |
| 99 | static d_write_t tapwrite; |
| 100 | static d_ioctl_t tapioctl; |
| 101 | static d_poll_t tappoll; |
| 102 | |
| 103 | static struct dev_ops tap_ops = { |
| 104 | { CDEV_NAME, CDEV_MAJOR, 0 }, |
| 105 | .d_open = tapopen, |
| 106 | .d_close = tapclose, |
| 107 | .d_read = tapread, |
| 108 | .d_write = tapwrite, |
| 109 | .d_ioctl = tapioctl, |
| 110 | .d_poll = tappoll, |
| 111 | }; |
| 112 | |
| 113 | static int taprefcnt = 0; /* module ref. counter */ |
| 114 | static int taplastunit = -1; /* max. open unit number */ |
| 115 | static int tapdebug = 0; /* debug flag */ |
| 116 | |
| 117 | MALLOC_DECLARE(M_TAP); |
| 118 | MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface"); |
| 119 | SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, ""); |
| 120 | DEV_MODULE(if_tap, tapmodevent, NULL); |
| 121 | |
| 122 | /* |
| 123 | * tapmodevent |
| 124 | * |
| 125 | * module event handler |
| 126 | */ |
| 127 | static int |
| 128 | tapmodevent(module_t mod, int type, void *data) |
| 129 | { |
| 130 | static int attached = 0; |
| 131 | struct ifnet *ifp = NULL; |
| 132 | int unit; |
| 133 | |
| 134 | switch (type) { |
| 135 | case MOD_LOAD: |
| 136 | if (attached) |
| 137 | return (EEXIST); |
| 138 | |
| 139 | dev_ops_add(&tap_ops, 0, 0); |
| 140 | attached = 1; |
| 141 | break; |
| 142 | |
| 143 | case MOD_UNLOAD: |
| 144 | if (taprefcnt > 0) |
| 145 | return (EBUSY); |
| 146 | |
| 147 | dev_ops_remove(&tap_ops, 0, 0); |
| 148 | |
| 149 | /* XXX: maintain tap ifs in a local list */ |
| 150 | unit = 0; |
| 151 | while (unit <= taplastunit) { |
| 152 | TAILQ_FOREACH(ifp, &ifnet, if_link) { |
| 153 | if ((strcmp(ifp->if_dname, TAP) == 0) || |
| 154 | (strcmp(ifp->if_dname, VMNET) == 0)) { |
| 155 | if (ifp->if_dunit == unit) |
| 156 | break; |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | if (ifp != NULL) { |
| 161 | struct tap_softc *tp = ifp->if_softc; |
| 162 | |
| 163 | TAPDEBUG(ifp, "detached. minor = %#x, " \ |
| 164 | "taplastunit = %d\n", |
| 165 | minor(tp->tap_dev), taplastunit); |
| 166 | |
| 167 | ether_ifdetach(ifp); |
| 168 | destroy_dev(tp->tap_dev); |
| 169 | kfree(tp, M_TAP); |
| 170 | } |
| 171 | else |
| 172 | unit ++; |
| 173 | } |
| 174 | |
| 175 | attached = 0; |
| 176 | break; |
| 177 | |
| 178 | default: |
| 179 | return (EOPNOTSUPP); |
| 180 | } |
| 181 | |
| 182 | return (0); |
| 183 | } /* tapmodevent */ |
| 184 | |
| 185 | |
| 186 | /* |
| 187 | * tapcreate |
| 188 | * |
| 189 | * to create interface |
| 190 | */ |
| 191 | static void |
| 192 | tapcreate(cdev_t dev) |
| 193 | { |
| 194 | struct ifnet *ifp = NULL; |
| 195 | struct tap_softc *tp = NULL; |
| 196 | uint8_t ether_addr[ETHER_ADDR_LEN]; |
| 197 | int unit; |
| 198 | char *name = NULL; |
| 199 | |
| 200 | /* allocate driver storage and create device */ |
| 201 | MALLOC(tp, struct tap_softc *, sizeof(*tp), M_TAP, M_WAITOK); |
| 202 | bzero(tp, sizeof(*tp)); |
| 203 | |
| 204 | /* select device: tap or vmnet */ |
| 205 | if (minor(dev) & VMNET_DEV_MASK) { |
| 206 | name = VMNET; |
| 207 | unit = lminor(dev) & 0xff; |
| 208 | tp->tap_flags |= TAP_VMNET; |
| 209 | } |
| 210 | else { |
| 211 | name = TAP; |
| 212 | unit = lminor(dev); |
| 213 | } |
| 214 | |
| 215 | tp->tap_dev = make_dev(&tap_ops, minor(dev), UID_ROOT, GID_WHEEL, |
| 216 | 0600, "%s%d", name, unit); |
| 217 | tp->tap_dev->si_drv1 = dev->si_drv1 = tp; |
| 218 | reference_dev(tp->tap_dev); /* so we can destroy it later */ |
| 219 | |
| 220 | /* generate fake MAC address: 00 bd xx xx xx unit_no */ |
| 221 | ether_addr[0] = 0x00; |
| 222 | ether_addr[1] = 0xbd; |
| 223 | bcopy(&ticks, ether_addr, 4); |
| 224 | ether_addr[5] = (u_char)unit; |
| 225 | |
| 226 | /* fill the rest and attach interface */ |
| 227 | ifp = &tp->tap_if; |
| 228 | ifp->if_softc = tp; |
| 229 | |
| 230 | if_initname(ifp, name, unit); |
| 231 | if (unit > taplastunit) |
| 232 | taplastunit = unit; |
| 233 | |
| 234 | ifp->if_init = tapifinit; |
| 235 | ifp->if_start = tapifstart; |
| 236 | ifp->if_ioctl = tapifioctl; |
| 237 | ifp->if_mtu = ETHERMTU; |
| 238 | ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST); |
| 239 | ifq_set_maxlen(&ifp->if_snd, ifqmaxlen); |
| 240 | ifq_set_ready(&ifp->if_snd); |
| 241 | |
| 242 | ether_ifattach(ifp, ether_addr, NULL); |
| 243 | |
| 244 | tp->tap_flags |= TAP_INITED; |
| 245 | |
| 246 | TAPDEBUG(ifp, "created. minor = %#x\n", minor(tp->tap_dev)); |
| 247 | } /* tapcreate */ |
| 248 | |
| 249 | |
| 250 | /* |
| 251 | * tapopen |
| 252 | * |
| 253 | * to open tunnel. must be superuser |
| 254 | */ |
| 255 | static int |
| 256 | tapopen(struct dev_open_args *ap) |
| 257 | { |
| 258 | cdev_t dev = ap->a_head.a_dev; |
| 259 | struct tap_softc *tp = NULL; |
| 260 | int error; |
| 261 | |
| 262 | if ((error = suser_cred(ap->a_cred, 0)) != 0) |
| 263 | return (error); |
| 264 | |
| 265 | tp = dev->si_drv1; |
| 266 | if (tp == NULL) { |
| 267 | tapcreate(dev); |
| 268 | tp = dev->si_drv1; |
| 269 | } |
| 270 | |
| 271 | if (tp->tap_flags & TAP_OPEN) |
| 272 | return (EBUSY); |
| 273 | |
| 274 | bcopy(tp->arpcom.ac_enaddr, tp->ether_addr, sizeof(tp->ether_addr)); |
| 275 | |
| 276 | tp->tap_td = curthread; |
| 277 | tp->tap_flags |= TAP_OPEN; |
| 278 | taprefcnt ++; |
| 279 | |
| 280 | TAPDEBUG(&tp->arpcom.ac_if, |
| 281 | "opened. minor = %#x, refcnt = %d, taplastunit = %d\n", |
| 282 | minor(tp->tap_dev), taprefcnt, taplastunit); |
| 283 | |
| 284 | return (0); |
| 285 | } /* tapopen */ |
| 286 | |
| 287 | |
| 288 | /* |
| 289 | * tapclose |
| 290 | * |
| 291 | * close the device - mark i/f down & delete routing info |
| 292 | */ |
| 293 | static int |
| 294 | tapclose(struct dev_close_args *ap) |
| 295 | { |
| 296 | cdev_t dev = ap->a_head.a_dev; |
| 297 | struct tap_softc *tp = dev->si_drv1; |
| 298 | struct ifnet *ifp = &tp->tap_if; |
| 299 | |
| 300 | /* junk all pending output */ |
| 301 | |
| 302 | lwkt_serialize_enter(ifp->if_serializer); |
| 303 | ifq_purge(&ifp->if_snd); |
| 304 | lwkt_serialize_exit(ifp->if_serializer); |
| 305 | |
| 306 | /* |
| 307 | * do not bring the interface down, and do not anything with |
| 308 | * interface, if we are in VMnet mode. just close the device. |
| 309 | */ |
| 310 | |
| 311 | if (((tp->tap_flags & TAP_VMNET) == 0) && (ifp->if_flags & IFF_UP)) { |
| 312 | if_down(ifp); |
| 313 | lwkt_serialize_enter(ifp->if_serializer); |
| 314 | if (ifp->if_flags & IFF_RUNNING) { |
| 315 | /* find internet addresses and delete routes */ |
| 316 | struct ifaddr *ifa = NULL; |
| 317 | |
| 318 | TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { |
| 319 | if (ifa->ifa_addr->sa_family == AF_INET) { |
| 320 | rtinit(ifa, (int)RTM_DELETE, 0); |
| 321 | |
| 322 | /* remove address from interface */ |
| 323 | bzero(ifa->ifa_addr, |
| 324 | sizeof(*(ifa->ifa_addr))); |
| 325 | bzero(ifa->ifa_dstaddr, |
| 326 | sizeof(*(ifa->ifa_dstaddr))); |
| 327 | bzero(ifa->ifa_netmask, |
| 328 | sizeof(*(ifa->ifa_netmask))); |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | ifp->if_flags &= ~IFF_RUNNING; |
| 333 | } |
| 334 | lwkt_serialize_exit(ifp->if_serializer); |
| 335 | } |
| 336 | |
| 337 | funsetown(tp->tap_sigio); |
| 338 | selwakeup(&tp->tap_rsel); |
| 339 | |
| 340 | tp->tap_flags &= ~TAP_OPEN; |
| 341 | tp->tap_td = NULL; |
| 342 | |
| 343 | taprefcnt --; |
| 344 | if (taprefcnt < 0) { |
| 345 | taprefcnt = 0; |
| 346 | if_printf(ifp, "minor = %#x, refcnt = %d is out of sync. " |
| 347 | "set refcnt to 0\n", minor(tp->tap_dev), taprefcnt); |
| 348 | } |
| 349 | |
| 350 | TAPDEBUG(ifp, "closed. minor = %#x, refcnt = %d, taplastunit = %d\n", |
| 351 | minor(tp->tap_dev), taprefcnt, taplastunit); |
| 352 | |
| 353 | return (0); |
| 354 | } /* tapclose */ |
| 355 | |
| 356 | |
| 357 | /* |
| 358 | * tapifinit |
| 359 | * |
| 360 | * network interface initialization function |
| 361 | */ |
| 362 | static void |
| 363 | tapifinit(void *xtp) |
| 364 | { |
| 365 | struct tap_softc *tp = (struct tap_softc *)xtp; |
| 366 | struct ifnet *ifp = &tp->tap_if; |
| 367 | |
| 368 | TAPDEBUG(ifp, "initializing, minor = %#x\n", minor(tp->tap_dev)); |
| 369 | |
| 370 | ifp->if_flags |= IFF_RUNNING; |
| 371 | ifp->if_flags &= ~IFF_OACTIVE; |
| 372 | |
| 373 | /* attempt to start output */ |
| 374 | tapifstart(ifp); |
| 375 | } /* tapifinit */ |
| 376 | |
| 377 | |
| 378 | /* |
| 379 | * tapifioctl |
| 380 | * |
| 381 | * Process an ioctl request on network interface |
| 382 | * |
| 383 | * MPSAFE |
| 384 | */ |
| 385 | int |
| 386 | tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) |
| 387 | { |
| 388 | struct tap_softc *tp = (struct tap_softc *)(ifp->if_softc); |
| 389 | struct ifstat *ifs = NULL; |
| 390 | int dummy; |
| 391 | |
| 392 | switch (cmd) { |
| 393 | case SIOCSIFADDR: |
| 394 | case SIOCGIFADDR: |
| 395 | case SIOCSIFMTU: |
| 396 | dummy = ether_ioctl(ifp, cmd, data); |
| 397 | return (dummy); |
| 398 | |
| 399 | case SIOCSIFFLAGS: /* XXX -- just like vmnet does */ |
| 400 | case SIOCADDMULTI: |
| 401 | case SIOCDELMULTI: |
| 402 | break; |
| 403 | |
| 404 | case SIOCGIFSTATUS: |
| 405 | ifs = (struct ifstat *)data; |
| 406 | dummy = strlen(ifs->ascii); |
| 407 | if (tp->tap_td != NULL && dummy < sizeof(ifs->ascii)) { |
| 408 | if (tp->tap_td->td_proc) { |
| 409 | snprintf(ifs->ascii + dummy, |
| 410 | sizeof(ifs->ascii) - dummy, |
| 411 | "\tOpened by pid %d\n", |
| 412 | (int)tp->tap_td->td_proc->p_pid); |
| 413 | } else { |
| 414 | snprintf(ifs->ascii + dummy, |
| 415 | sizeof(ifs->ascii) - dummy, |
| 416 | "\tOpened by td %p\n", tp->tap_td); |
| 417 | } |
| 418 | } |
| 419 | break; |
| 420 | |
| 421 | default: |
| 422 | return (EINVAL); |
| 423 | } |
| 424 | |
| 425 | return (0); |
| 426 | } /* tapifioctl */ |
| 427 | |
| 428 | |
| 429 | /* |
| 430 | * tapifstart |
| 431 | * |
| 432 | * queue packets from higher level ready to put out |
| 433 | */ |
| 434 | static void |
| 435 | tapifstart(struct ifnet *ifp) |
| 436 | { |
| 437 | struct tap_softc *tp = ifp->if_softc; |
| 438 | |
| 439 | TAPDEBUG(ifp, "starting, minor = %#x\n", minor(tp->tap_dev)); |
| 440 | |
| 441 | /* |
| 442 | * do not junk pending output if we are in VMnet mode. |
| 443 | * XXX: can this do any harm because of queue overflow? |
| 444 | */ |
| 445 | |
| 446 | if (((tp->tap_flags & TAP_VMNET) == 0) && |
| 447 | ((tp->tap_flags & TAP_READY) != TAP_READY)) { |
| 448 | TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n", |
| 449 | minor(tp->tap_dev), tp->tap_flags); |
| 450 | |
| 451 | ifq_purge(&ifp->if_snd); |
| 452 | return; |
| 453 | } |
| 454 | |
| 455 | ifp->if_flags |= IFF_OACTIVE; |
| 456 | |
| 457 | if (!ifq_is_empty(&ifp->if_snd)) { |
| 458 | if (tp->tap_flags & TAP_RWAIT) { |
| 459 | tp->tap_flags &= ~TAP_RWAIT; |
| 460 | wakeup((caddr_t)tp); |
| 461 | } |
| 462 | |
| 463 | if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) |
| 464 | pgsigio(tp->tap_sigio, SIGIO, 0); |
| 465 | |
| 466 | /* |
| 467 | * selwakeup is not MPSAFE. tapifstart is. |
| 468 | */ |
| 469 | get_mplock(); |
| 470 | selwakeup(&tp->tap_rsel); |
| 471 | rel_mplock(); |
| 472 | ifp->if_opackets ++; /* obytes are counted in ether_output */ |
| 473 | } |
| 474 | |
| 475 | ifp->if_flags &= ~IFF_OACTIVE; |
| 476 | } /* tapifstart */ |
| 477 | |
| 478 | |
| 479 | /* |
| 480 | * tapioctl |
| 481 | * |
| 482 | * the ops interface is now pretty minimal |
| 483 | */ |
| 484 | static int |
| 485 | tapioctl(struct dev_ioctl_args *ap) |
| 486 | { |
| 487 | cdev_t dev = ap->a_head.a_dev; |
| 488 | caddr_t data = ap->a_data; |
| 489 | struct tap_softc *tp = dev->si_drv1; |
| 490 | struct ifnet *ifp = &tp->tap_if; |
| 491 | struct tapinfo *tapp = NULL; |
| 492 | struct mbuf *mb; |
| 493 | short f; |
| 494 | int error; |
| 495 | |
| 496 | lwkt_serialize_enter(ifp->if_serializer); |
| 497 | error = 0; |
| 498 | |
| 499 | switch (ap->a_cmd) { |
| 500 | case TAPSIFINFO: |
| 501 | tapp = (struct tapinfo *)data; |
| 502 | ifp->if_mtu = tapp->mtu; |
| 503 | ifp->if_type = tapp->type; |
| 504 | ifp->if_baudrate = tapp->baudrate; |
| 505 | break; |
| 506 | |
| 507 | case TAPGIFINFO: |
| 508 | tapp = (struct tapinfo *)data; |
| 509 | tapp->mtu = ifp->if_mtu; |
| 510 | tapp->type = ifp->if_type; |
| 511 | tapp->baudrate = ifp->if_baudrate; |
| 512 | break; |
| 513 | |
| 514 | case TAPSDEBUG: |
| 515 | tapdebug = *(int *)data; |
| 516 | break; |
| 517 | |
| 518 | case TAPGDEBUG: |
| 519 | *(int *)data = tapdebug; |
| 520 | break; |
| 521 | |
| 522 | case FIOASYNC: |
| 523 | if (*(int *)data) |
| 524 | tp->tap_flags |= TAP_ASYNC; |
| 525 | else |
| 526 | tp->tap_flags &= ~TAP_ASYNC; |
| 527 | break; |
| 528 | |
| 529 | case FIONREAD: |
| 530 | *(int *)data = 0; |
| 531 | if ((mb = ifq_poll(&ifp->if_snd)) != NULL) { |
| 532 | for(; mb != NULL; mb = mb->m_next) |
| 533 | *(int *)data += mb->m_len; |
| 534 | } |
| 535 | break; |
| 536 | |
| 537 | case FIOSETOWN: |
| 538 | error = fsetown(*(int *)data, &tp->tap_sigio); |
| 539 | break; |
| 540 | |
| 541 | case FIOGETOWN: |
| 542 | *(int *)data = fgetown(tp->tap_sigio); |
| 543 | break; |
| 544 | |
| 545 | /* this is deprecated, FIOSETOWN should be used instead */ |
| 546 | case TIOCSPGRP: |
| 547 | error = fsetown(-(*(int *)data), &tp->tap_sigio); |
| 548 | break; |
| 549 | |
| 550 | /* this is deprecated, FIOGETOWN should be used instead */ |
| 551 | case TIOCGPGRP: |
| 552 | *(int *)data = -fgetown(tp->tap_sigio); |
| 553 | break; |
| 554 | |
| 555 | /* VMware/VMnet port ioctl's */ |
| 556 | |
| 557 | case SIOCGIFFLAGS: /* get ifnet flags */ |
| 558 | bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags)); |
| 559 | break; |
| 560 | |
| 561 | case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ |
| 562 | f = *(short *)data; |
| 563 | f &= 0x0fff; |
| 564 | f &= ~IFF_CANTCHANGE; |
| 565 | f |= IFF_UP; |
| 566 | ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE); |
| 567 | break; |
| 568 | |
| 569 | case OSIOCGIFADDR: /* get MAC address of the remote side */ |
| 570 | case SIOCGIFADDR: |
| 571 | bcopy(tp->ether_addr, data, sizeof(tp->ether_addr)); |
| 572 | break; |
| 573 | |
| 574 | case SIOCSIFADDR: /* set MAC address of the remote side */ |
| 575 | bcopy(data, tp->ether_addr, sizeof(tp->ether_addr)); |
| 576 | break; |
| 577 | |
| 578 | default: |
| 579 | error = ENOTTY; |
| 580 | break; |
| 581 | } |
| 582 | lwkt_serialize_exit(ifp->if_serializer); |
| 583 | return (error); |
| 584 | } /* tapioctl */ |
| 585 | |
| 586 | |
| 587 | /* |
| 588 | * tapread |
| 589 | * |
| 590 | * the ops read interface - reads a packet at a time, or at |
| 591 | * least as much of a packet as can be read |
| 592 | */ |
| 593 | static int |
| 594 | tapread(struct dev_read_args *ap) |
| 595 | { |
| 596 | cdev_t dev = ap->a_head.a_dev; |
| 597 | struct uio *uio = ap->a_uio; |
| 598 | struct tap_softc *tp = dev->si_drv1; |
| 599 | struct ifnet *ifp = &tp->tap_if; |
| 600 | struct mbuf *m0 = NULL; |
| 601 | int error = 0, len; |
| 602 | |
| 603 | TAPDEBUG(ifp, "reading, minor = %#x\n", minor(tp->tap_dev)); |
| 604 | |
| 605 | if ((tp->tap_flags & TAP_READY) != TAP_READY) { |
| 606 | TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n", |
| 607 | minor(tp->tap_dev), tp->tap_flags); |
| 608 | |
| 609 | return (EHOSTDOWN); |
| 610 | } |
| 611 | |
| 612 | tp->tap_flags &= ~TAP_RWAIT; |
| 613 | |
| 614 | /* sleep until we get a packet */ |
| 615 | do { |
| 616 | lwkt_serialize_enter(ifp->if_serializer); |
| 617 | m0 = ifq_dequeue(&ifp->if_snd, NULL); |
| 618 | if (m0 == NULL) { |
| 619 | if (ap->a_ioflag & IO_NDELAY) { |
| 620 | lwkt_serialize_exit(ifp->if_serializer); |
| 621 | return (EWOULDBLOCK); |
| 622 | } |
| 623 | tp->tap_flags |= TAP_RWAIT; |
| 624 | crit_enter(); |
| 625 | tsleep_interlock(tp); |
| 626 | lwkt_serialize_exit(ifp->if_serializer); |
| 627 | error = tsleep(tp, PCATCH, "taprd", 0); |
| 628 | crit_exit(); |
| 629 | if (error) |
| 630 | return (error); |
| 631 | } else { |
| 632 | lwkt_serialize_exit(ifp->if_serializer); |
| 633 | } |
| 634 | } while (m0 == NULL); |
| 635 | |
| 636 | BPF_MTAP(ifp, m0); |
| 637 | |
| 638 | /* xfer packet to user space */ |
| 639 | while ((m0 != NULL) && (uio->uio_resid > 0) && (error == 0)) { |
| 640 | len = min(uio->uio_resid, m0->m_len); |
| 641 | if (len == 0) |
| 642 | break; |
| 643 | |
| 644 | error = uiomove(mtod(m0, caddr_t), len, uio); |
| 645 | m0 = m_free(m0); |
| 646 | } |
| 647 | |
| 648 | if (m0 != NULL) { |
| 649 | TAPDEBUG(ifp, "dropping mbuf, minor = %#x\n", |
| 650 | minor(tp->tap_dev)); |
| 651 | m_freem(m0); |
| 652 | } |
| 653 | |
| 654 | return (error); |
| 655 | } /* tapread */ |
| 656 | |
| 657 | |
| 658 | /* |
| 659 | * tapwrite |
| 660 | * |
| 661 | * the ops write interface - an atomic write is a packet - or else! |
| 662 | */ |
| 663 | static int |
| 664 | tapwrite(struct dev_write_args *ap) |
| 665 | { |
| 666 | cdev_t dev = ap->a_head.a_dev; |
| 667 | struct uio *uio = ap->a_uio; |
| 668 | struct tap_softc *tp = dev->si_drv1; |
| 669 | struct ifnet *ifp = &tp->tap_if; |
| 670 | struct mbuf *top = NULL, **mp = NULL, *m = NULL; |
| 671 | int error = 0, tlen, mlen; |
| 672 | |
| 673 | TAPDEBUG(ifp, "writting, minor = %#x\n", minor(tp->tap_dev)); |
| 674 | |
| 675 | if (uio->uio_resid == 0) |
| 676 | return (0); |
| 677 | |
| 678 | if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) { |
| 679 | TAPDEBUG(ifp, "invalid packet len = %d, minor = %#x\n", |
| 680 | uio->uio_resid, minor(tp->tap_dev)); |
| 681 | |
| 682 | return (EIO); |
| 683 | } |
| 684 | tlen = uio->uio_resid; |
| 685 | |
| 686 | /* get a header mbuf */ |
| 687 | MGETHDR(m, MB_DONTWAIT, MT_DATA); |
| 688 | if (m == NULL) |
| 689 | return (ENOBUFS); |
| 690 | mlen = MHLEN; |
| 691 | |
| 692 | top = 0; |
| 693 | mp = ⊤ |
| 694 | while ((error == 0) && (uio->uio_resid > 0)) { |
| 695 | m->m_len = min(mlen, uio->uio_resid); |
| 696 | error = uiomove(mtod(m, caddr_t), m->m_len, uio); |
| 697 | *mp = m; |
| 698 | mp = &m->m_next; |
| 699 | if (uio->uio_resid > 0) { |
| 700 | MGET(m, MB_DONTWAIT, MT_DATA); |
| 701 | if (m == NULL) { |
| 702 | error = ENOBUFS; |
| 703 | break; |
| 704 | } |
| 705 | mlen = MLEN; |
| 706 | } |
| 707 | } |
| 708 | if (error) { |
| 709 | ifp->if_ierrors ++; |
| 710 | if (top) |
| 711 | m_freem(top); |
| 712 | return (error); |
| 713 | } |
| 714 | |
| 715 | top->m_pkthdr.len = tlen; |
| 716 | top->m_pkthdr.rcvif = ifp; |
| 717 | |
| 718 | /* |
| 719 | * Ethernet bridge and bpf are handled in ether_input |
| 720 | * |
| 721 | * adjust mbuf and give packet to the ether_input |
| 722 | */ |
| 723 | lwkt_serialize_enter(ifp->if_serializer); |
| 724 | ifp->if_input(ifp, top); |
| 725 | ifp->if_ipackets ++; /* ibytes are counted in ether_input */ |
| 726 | lwkt_serialize_exit(ifp->if_serializer); |
| 727 | |
| 728 | return (0); |
| 729 | } /* tapwrite */ |
| 730 | |
| 731 | |
| 732 | /* |
| 733 | * tappoll |
| 734 | * |
| 735 | * the poll interface, this is only useful on reads |
| 736 | * really. the write detect always returns true, write never blocks |
| 737 | * anyway, it either accepts the packet or drops it |
| 738 | */ |
| 739 | static int |
| 740 | tappoll(struct dev_poll_args *ap) |
| 741 | { |
| 742 | cdev_t dev = ap->a_head.a_dev; |
| 743 | struct tap_softc *tp = dev->si_drv1; |
| 744 | struct ifnet *ifp = &tp->tap_if; |
| 745 | int revents = 0; |
| 746 | |
| 747 | TAPDEBUG(ifp, "polling, minor = %#x\n", minor(tp->tap_dev)); |
| 748 | |
| 749 | lwkt_serialize_enter(ifp->if_serializer); |
| 750 | if (ap->a_events & (POLLIN | POLLRDNORM)) { |
| 751 | if (!ifq_is_empty(&ifp->if_snd)) { |
| 752 | TAPDEBUG(ifp, |
| 753 | "has data in queue. minor = %#x\n", |
| 754 | minor(tp->tap_dev)); |
| 755 | |
| 756 | revents |= (ap->a_events & (POLLIN | POLLRDNORM)); |
| 757 | } |
| 758 | else { |
| 759 | TAPDEBUG(ifp, "waiting for data, minor = %#x\n", |
| 760 | minor(tp->tap_dev)); |
| 761 | |
| 762 | selrecord(curthread, &tp->tap_rsel); |
| 763 | } |
| 764 | } |
| 765 | lwkt_serialize_exit(ifp->if_serializer); |
| 766 | |
| 767 | if (ap->a_events & (POLLOUT | POLLWRNORM)) |
| 768 | revents |= (ap->a_events & (POLLOUT | POLLWRNORM)); |
| 769 | ap->a_events = revents; |
| 770 | return(0); |
| 771 | } /* tappoll */ |