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sys/net/if_tap.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (C) 1999-2000 by Maksim Yevmenkin <m_evmenkin@yahoo.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * BASED ON: 29 * ------------------------------------------------------------------------- 30 * 31 * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk> 32 * Nottingham University 1987. 33 */ 34 35 /* 36 * $FreeBSD: releng/12.0/sys/net/if_tap.c 339121 2018-10-03 07:35:16Z tuexen $ 37 * $Id: if_tap.c,v 0.21 2000/07/23 21:46:02 max Exp $ 38 */ 39 40 #include "opt_inet.h" 41 42 #include <sys/param.h> 43 #include <sys/conf.h> 44 #include <sys/fcntl.h> 45 #include <sys/filio.h> 46 #include <sys/jail.h> 47 #include <sys/kernel.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/module.h> 51 #include <sys/poll.h> 52 #include <sys/priv.h> 53 #include <sys/proc.h> 54 #include <sys/selinfo.h> 55 #include <sys/signalvar.h> 56 #include <sys/socket.h> 57 #include <sys/sockio.h> 58 #include <sys/sysctl.h> 59 #include <sys/systm.h> 60 #include <sys/ttycom.h> 61 #include <sys/uio.h> 62 #include <sys/queue.h> 63 64 #include <net/bpf.h> 65 #include <net/ethernet.h> 66 #include <net/if.h> 67 #include <net/if_var.h> 68 #include <net/if_clone.h> 69 #include <net/if_dl.h> 70 #include <net/if_media.h> 71 #include <net/if_types.h> 72 #include <net/route.h> 73 #include <net/vnet.h> 74 75 #include <netinet/in.h> 76 77 #include <net/if_tapvar.h> 78 #include <net/if_tap.h> 79 80 #define CDEV_NAME "tap" 81 #define TAPDEBUG if (tapdebug) printf 82 83 static const char tapname[] = "tap"; 84 static const char vmnetname[] = "vmnet"; 85 #define TAPMAXUNIT 0x7fff 86 #define VMNET_DEV_MASK CLONE_FLAG0 87 88 /* module */ 89 static int tapmodevent(module_t, int, void *); 90 91 /* device */ 92 static void tapclone(void *, struct ucred *, char *, int, 93 struct cdev **); 94 static void tapcreate(struct cdev *); 95 96 /* network interface */ 97 static void tapifstart(struct ifnet *); 98 static int tapifioctl(struct ifnet *, u_long, caddr_t); 99 static void tapifinit(void *); 100 101 static int tap_clone_create(struct if_clone *, int, caddr_t); 102 static void tap_clone_destroy(struct ifnet *); 103 static struct if_clone *tap_cloner; 104 static int vmnet_clone_create(struct if_clone *, int, caddr_t); 105 static void vmnet_clone_destroy(struct ifnet *); 106 static struct if_clone *vmnet_cloner; 107 108 /* character device */ 109 static d_open_t tapopen; 110 static d_close_t tapclose; 111 static d_read_t tapread; 112 static d_write_t tapwrite; 113 static d_ioctl_t tapioctl; 114 static d_poll_t tappoll; 115 static d_kqfilter_t tapkqfilter; 116 117 /* kqueue(2) */ 118 static int tapkqread(struct knote *, long); 119 static int tapkqwrite(struct knote *, long); 120 static void tapkqdetach(struct knote *); 121 122 static struct filterops tap_read_filterops = { 123 .f_isfd = 1, 124 .f_attach = NULL, 125 .f_detach = tapkqdetach, 126 .f_event = tapkqread, 127 }; 128 129 static struct filterops tap_write_filterops = { 130 .f_isfd = 1, 131 .f_attach = NULL, 132 .f_detach = tapkqdetach, 133 .f_event = tapkqwrite, 134 }; 135 136 static struct cdevsw tap_cdevsw = { 137 .d_version = D_VERSION, 138 .d_flags = D_NEEDMINOR, 139 .d_open = tapopen, 140 .d_close = tapclose, 141 .d_read = tapread, 142 .d_write = tapwrite, 143 .d_ioctl = tapioctl, 144 .d_poll = tappoll, 145 .d_name = CDEV_NAME, 146 .d_kqfilter = tapkqfilter, 147 }; 148 149 /* 150 * All global variables in if_tap.c are locked with tapmtx, with the 151 * exception of tapdebug, which is accessed unlocked; tapclones is 152 * static at runtime. 153 */ 154 static struct mtx tapmtx; 155 static int tapdebug = 0; /* debug flag */ 156 static int tapuopen = 0; /* allow user open() */ 157 static int tapuponopen = 0; /* IFF_UP on open() */ 158 static int tapdclone = 1; /* enable devfs cloning */ 159 static SLIST_HEAD(, tap_softc) taphead; /* first device */ 160 static struct clonedevs *tapclones; 161 162 MALLOC_DECLARE(M_TAP); 163 MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface"); 164 SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, ""); 165 166 SYSCTL_DECL(_net_link); 167 static SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0, 168 "Ethernet tunnel software network interface"); 169 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0, 170 "Allow user to open /dev/tap (based on node permissions)"); 171 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0, 172 "Bring interface up when /dev/tap is opened"); 173 SYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tapdclone, 0, 174 "Enable legacy devfs interface creation"); 175 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, ""); 176 177 DEV_MODULE(if_tap, tapmodevent, NULL); 178 179 static int 180 tap_clone_create(struct if_clone *ifc, int unit, caddr_t params) 181 { 182 struct cdev *dev; 183 int i; 184 185 /* Find any existing device, or allocate new unit number. */ 186 i = clone_create(&tapclones, &tap_cdevsw, &unit, &dev, 0); 187 if (i) { 188 dev = make_dev(&tap_cdevsw, unit, UID_ROOT, GID_WHEEL, 0600, 189 "%s%d", tapname, unit); 190 } 191 192 tapcreate(dev); 193 return (0); 194 } 195 196 /* vmnet devices are tap devices in disguise */ 197 static int 198 vmnet_clone_create(struct if_clone *ifc, int unit, caddr_t params) 199 { 200 struct cdev *dev; 201 int i; 202 203 /* Find any existing device, or allocate new unit number. */ 204 i = clone_create(&tapclones, &tap_cdevsw, &unit, &dev, VMNET_DEV_MASK); 205 if (i) { 206 dev = make_dev(&tap_cdevsw, unit | VMNET_DEV_MASK, UID_ROOT, 207 GID_WHEEL, 0600, "%s%d", vmnetname, unit); 208 } 209 210 tapcreate(dev); 211 return (0); 212 } 213 214 static void 215 tap_destroy(struct tap_softc *tp) 216 { 217 struct ifnet *ifp = tp->tap_ifp; 218 219 CURVNET_SET(ifp->if_vnet); 220 destroy_dev(tp->tap_dev); 221 seldrain(&tp->tap_rsel); 222 knlist_clear(&tp->tap_rsel.si_note, 0); 223 knlist_destroy(&tp->tap_rsel.si_note); 224 ether_ifdetach(ifp); 225 if_free(ifp); 226 227 mtx_destroy(&tp->tap_mtx); 228 free(tp, M_TAP); 229 CURVNET_RESTORE(); 230 } 231 232 static void 233 tap_clone_destroy(struct ifnet *ifp) 234 { 235 struct tap_softc *tp = ifp->if_softc; 236 237 mtx_lock(&tapmtx); 238 SLIST_REMOVE(&taphead, tp, tap_softc, tap_next); 239 mtx_unlock(&tapmtx); 240 tap_destroy(tp); 241 } 242 243 /* vmnet devices are tap devices in disguise */ 244 static void 245 vmnet_clone_destroy(struct ifnet *ifp) 246 { 247 tap_clone_destroy(ifp); 248 } 249 250 /* 251 * tapmodevent 252 * 253 * module event handler 254 */ 255 static int 256 tapmodevent(module_t mod, int type, void *data) 257 { 258 static eventhandler_tag eh_tag = NULL; 259 struct tap_softc *tp = NULL; 260 struct ifnet *ifp = NULL; 261 262 switch (type) { 263 case MOD_LOAD: 264 265 /* intitialize device */ 266 267 mtx_init(&tapmtx, "tapmtx", NULL, MTX_DEF); 268 SLIST_INIT(&taphead); 269 270 clone_setup(&tapclones); 271 eh_tag = EVENTHANDLER_REGISTER(dev_clone, tapclone, 0, 1000); 272 if (eh_tag == NULL) { 273 clone_cleanup(&tapclones); 274 mtx_destroy(&tapmtx); 275 return (ENOMEM); 276 } 277 tap_cloner = if_clone_simple(tapname, tap_clone_create, 278 tap_clone_destroy, 0); 279 vmnet_cloner = if_clone_simple(vmnetname, vmnet_clone_create, 280 vmnet_clone_destroy, 0); 281 return (0); 282 283 case MOD_UNLOAD: 284 /* 285 * The EBUSY algorithm here can't quite atomically 286 * guarantee that this is race-free since we have to 287 * release the tap mtx to deregister the clone handler. 288 */ 289 mtx_lock(&tapmtx); 290 SLIST_FOREACH(tp, &taphead, tap_next) { 291 mtx_lock(&tp->tap_mtx); 292 if (tp->tap_flags & TAP_OPEN) { 293 mtx_unlock(&tp->tap_mtx); 294 mtx_unlock(&tapmtx); 295 return (EBUSY); 296 } 297 mtx_unlock(&tp->tap_mtx); 298 } 299 mtx_unlock(&tapmtx); 300 301 EVENTHANDLER_DEREGISTER(dev_clone, eh_tag); 302 if_clone_detach(tap_cloner); 303 if_clone_detach(vmnet_cloner); 304 drain_dev_clone_events(); 305 306 mtx_lock(&tapmtx); 307 while ((tp = SLIST_FIRST(&taphead)) != NULL) { 308 SLIST_REMOVE_HEAD(&taphead, tap_next); 309 mtx_unlock(&tapmtx); 310 311 ifp = tp->tap_ifp; 312 313 TAPDEBUG("detaching %s\n", ifp->if_xname); 314 315 tap_destroy(tp); 316 mtx_lock(&tapmtx); 317 } 318 mtx_unlock(&tapmtx); 319 clone_cleanup(&tapclones); 320 321 mtx_destroy(&tapmtx); 322 323 break; 324 325 default: 326 return (EOPNOTSUPP); 327 } 328 329 return (0); 330 } /* tapmodevent */ 331 332 333 /* 334 * DEVFS handler 335 * 336 * We need to support two kind of devices - tap and vmnet 337 */ 338 static void 339 tapclone(void *arg, struct ucred *cred, char *name, int namelen, struct cdev **dev) 340 { 341 char devname[SPECNAMELEN + 1]; 342 int i, unit, append_unit; 343 int extra; 344 345 if (*dev != NULL) 346 return; 347 348 if (!tapdclone || 349 (!tapuopen && priv_check_cred(cred, PRIV_NET_IFCREATE, 0) != 0)) 350 return; 351 352 unit = 0; 353 append_unit = 0; 354 extra = 0; 355 356 /* We're interested in only tap/vmnet devices. */ 357 if (strcmp(name, tapname) == 0) { 358 unit = -1; 359 } else if (strcmp(name, vmnetname) == 0) { 360 unit = -1; 361 extra = VMNET_DEV_MASK; 362 } else if (dev_stdclone(name, NULL, tapname, &unit) != 1) { 363 if (dev_stdclone(name, NULL, vmnetname, &unit) != 1) { 364 return; 365 } else { 366 extra = VMNET_DEV_MASK; 367 } 368 } 369 370 if (unit == -1) 371 append_unit = 1; 372 373 CURVNET_SET(CRED_TO_VNET(cred)); 374 /* find any existing device, or allocate new unit number */ 375 i = clone_create(&tapclones, &tap_cdevsw, &unit, dev, extra); 376 if (i) { 377 if (append_unit) { 378 /* 379 * We were passed 'tun' or 'tap', with no unit specified 380 * so we'll need to append it now. 381 */ 382 namelen = snprintf(devname, sizeof(devname), "%s%d", name, 383 unit); 384 name = devname; 385 } 386 387 *dev = make_dev_credf(MAKEDEV_REF, &tap_cdevsw, unit | extra, 388 cred, UID_ROOT, GID_WHEEL, 0600, "%s", name); 389 } 390 391 if_clone_create(name, namelen, NULL); 392 CURVNET_RESTORE(); 393 } /* tapclone */ 394 395 396 /* 397 * tapcreate 398 * 399 * to create interface 400 */ 401 static void 402 tapcreate(struct cdev *dev) 403 { 404 struct ifnet *ifp = NULL; 405 struct tap_softc *tp = NULL; 406 unsigned short macaddr_hi; 407 uint32_t macaddr_mid; 408 int unit; 409 const char *name = NULL; 410 u_char eaddr[6]; 411 412 /* allocate driver storage and create device */ 413 tp = malloc(sizeof(*tp), M_TAP, M_WAITOK | M_ZERO); 414 mtx_init(&tp->tap_mtx, "tap_mtx", NULL, MTX_DEF); 415 mtx_lock(&tapmtx); 416 SLIST_INSERT_HEAD(&taphead, tp, tap_next); 417 mtx_unlock(&tapmtx); 418 419 unit = dev2unit(dev); 420 421 /* select device: tap or vmnet */ 422 if (unit & VMNET_DEV_MASK) { 423 name = vmnetname; 424 tp->tap_flags |= TAP_VMNET; 425 } else 426 name = tapname; 427 428 unit &= TAPMAXUNIT; 429 430 TAPDEBUG("tapcreate(%s%d). minor = %#x\n", name, unit, dev2unit(dev)); 431 432 /* generate fake MAC address: 00 bd xx xx xx unit_no */ 433 macaddr_hi = htons(0x00bd); 434 macaddr_mid = (uint32_t) ticks; 435 bcopy(&macaddr_hi, eaddr, sizeof(short)); 436 bcopy(&macaddr_mid, &eaddr[2], sizeof(uint32_t)); 437 eaddr[5] = (u_char)unit; 438 439 /* fill the rest and attach interface */ 440 ifp = tp->tap_ifp = if_alloc(IFT_ETHER); 441 if (ifp == NULL) 442 panic("%s%d: can not if_alloc()", name, unit); 443 ifp->if_softc = tp; 444 if_initname(ifp, name, unit); 445 ifp->if_init = tapifinit; 446 ifp->if_start = tapifstart; 447 ifp->if_ioctl = tapifioctl; 448 ifp->if_mtu = ETHERMTU; 449 ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST); 450 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 451 ifp->if_capabilities |= IFCAP_LINKSTATE; 452 ifp->if_capenable |= IFCAP_LINKSTATE; 453 454 dev->si_drv1 = tp; 455 tp->tap_dev = dev; 456 457 ether_ifattach(ifp, eaddr); 458 459 mtx_lock(&tp->tap_mtx); 460 tp->tap_flags |= TAP_INITED; 461 mtx_unlock(&tp->tap_mtx); 462 463 knlist_init_mtx(&tp->tap_rsel.si_note, &tp->tap_mtx); 464 465 TAPDEBUG("interface %s is created. minor = %#x\n", 466 ifp->if_xname, dev2unit(dev)); 467 } /* tapcreate */ 468 469 470 /* 471 * tapopen 472 * 473 * to open tunnel. must be superuser 474 */ 475 static int 476 tapopen(struct cdev *dev, int flag, int mode, struct thread *td) 477 { 478 struct tap_softc *tp = NULL; 479 struct ifnet *ifp = NULL; 480 int error; 481 482 if (tapuopen == 0) { 483 error = priv_check(td, PRIV_NET_TAP); 484 if (error) 485 return (error); 486 } 487 488 if ((dev2unit(dev) & CLONE_UNITMASK) > TAPMAXUNIT) 489 return (ENXIO); 490 491 tp = dev->si_drv1; 492 493 mtx_lock(&tp->tap_mtx); 494 if (tp->tap_flags & TAP_OPEN) { 495 mtx_unlock(&tp->tap_mtx); 496 return (EBUSY); 497 } 498 499 bcopy(IF_LLADDR(tp->tap_ifp), tp->ether_addr, sizeof(tp->ether_addr)); 500 tp->tap_pid = td->td_proc->p_pid; 501 tp->tap_flags |= TAP_OPEN; 502 ifp = tp->tap_ifp; 503 504 ifp->if_drv_flags |= IFF_DRV_RUNNING; 505 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 506 if (tapuponopen) 507 ifp->if_flags |= IFF_UP; 508 if_link_state_change(ifp, LINK_STATE_UP); 509 mtx_unlock(&tp->tap_mtx); 510 511 TAPDEBUG("%s is open. minor = %#x\n", ifp->if_xname, dev2unit(dev)); 512 513 return (0); 514 } /* tapopen */ 515 516 517 /* 518 * tapclose 519 * 520 * close the device - mark i/f down & delete routing info 521 */ 522 static int 523 tapclose(struct cdev *dev, int foo, int bar, struct thread *td) 524 { 525 struct ifaddr *ifa; 526 struct tap_softc *tp = dev->si_drv1; 527 struct ifnet *ifp = tp->tap_ifp; 528 529 /* junk all pending output */ 530 mtx_lock(&tp->tap_mtx); 531 CURVNET_SET(ifp->if_vnet); 532 IF_DRAIN(&ifp->if_snd); 533 534 /* 535 * Do not bring the interface down, and do not anything with 536 * interface, if we are in VMnet mode. Just close the device. 537 */ 538 if (((tp->tap_flags & TAP_VMNET) == 0) && 539 (ifp->if_flags & (IFF_UP | IFF_LINK0)) == IFF_UP) { 540 mtx_unlock(&tp->tap_mtx); 541 if_down(ifp); 542 mtx_lock(&tp->tap_mtx); 543 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 544 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 545 mtx_unlock(&tp->tap_mtx); 546 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 547 rtinit(ifa, (int)RTM_DELETE, 0); 548 } 549 if_purgeaddrs(ifp); 550 mtx_lock(&tp->tap_mtx); 551 } 552 } 553 554 if_link_state_change(ifp, LINK_STATE_DOWN); 555 CURVNET_RESTORE(); 556 557 funsetown(&tp->tap_sigio); 558 selwakeuppri(&tp->tap_rsel, PZERO+1); 559 KNOTE_LOCKED(&tp->tap_rsel.si_note, 0); 560 561 tp->tap_flags &= ~TAP_OPEN; 562 tp->tap_pid = 0; 563 mtx_unlock(&tp->tap_mtx); 564 565 TAPDEBUG("%s is closed. minor = %#x\n", 566 ifp->if_xname, dev2unit(dev)); 567 568 return (0); 569 } /* tapclose */ 570 571 572 /* 573 * tapifinit 574 * 575 * network interface initialization function 576 */ 577 static void 578 tapifinit(void *xtp) 579 { 580 struct tap_softc *tp = (struct tap_softc *)xtp; 581 struct ifnet *ifp = tp->tap_ifp; 582 583 TAPDEBUG("initializing %s\n", ifp->if_xname); 584 585 mtx_lock(&tp->tap_mtx); 586 ifp->if_drv_flags |= IFF_DRV_RUNNING; 587 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 588 mtx_unlock(&tp->tap_mtx); 589 590 /* attempt to start output */ 591 tapifstart(ifp); 592 } /* tapifinit */ 593 594 595 /* 596 * tapifioctl 597 * 598 * Process an ioctl request on network interface 599 */ 600 static int 601 tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 602 { 603 struct tap_softc *tp = ifp->if_softc; 604 struct ifreq *ifr = (struct ifreq *)data; 605 struct ifstat *ifs = NULL; 606 struct ifmediareq *ifmr = NULL; 607 int dummy, error = 0; 608 609 switch (cmd) { 610 case SIOCSIFFLAGS: /* XXX -- just like vmnet does */ 611 case SIOCADDMULTI: 612 case SIOCDELMULTI: 613 break; 614 615 case SIOCGIFMEDIA: 616 ifmr = (struct ifmediareq *)data; 617 dummy = ifmr->ifm_count; 618 ifmr->ifm_count = 1; 619 ifmr->ifm_status = IFM_AVALID; 620 ifmr->ifm_active = IFM_ETHER; 621 if (tp->tap_flags & TAP_OPEN) 622 ifmr->ifm_status |= IFM_ACTIVE; 623 ifmr->ifm_current = ifmr->ifm_active; 624 if (dummy >= 1) { 625 int media = IFM_ETHER; 626 error = copyout(&media, ifmr->ifm_ulist, 627 sizeof(int)); 628 } 629 break; 630 631 case SIOCSIFMTU: 632 ifp->if_mtu = ifr->ifr_mtu; 633 break; 634 635 case SIOCGIFSTATUS: 636 ifs = (struct ifstat *)data; 637 mtx_lock(&tp->tap_mtx); 638 if (tp->tap_pid != 0) 639 snprintf(ifs->ascii, sizeof(ifs->ascii), 640 "\tOpened by PID %d\n", tp->tap_pid); 641 else 642 ifs->ascii[0] = '\0'; 643 mtx_unlock(&tp->tap_mtx); 644 break; 645 646 default: 647 error = ether_ioctl(ifp, cmd, data); 648 break; 649 } 650 651 return (error); 652 } /* tapifioctl */ 653 654 655 /* 656 * tapifstart 657 * 658 * queue packets from higher level ready to put out 659 */ 660 static void 661 tapifstart(struct ifnet *ifp) 662 { 663 struct tap_softc *tp = ifp->if_softc; 664 665 TAPDEBUG("%s starting\n", ifp->if_xname); 666 667 /* 668 * do not junk pending output if we are in VMnet mode. 669 * XXX: can this do any harm because of queue overflow? 670 */ 671 672 mtx_lock(&tp->tap_mtx); 673 if (((tp->tap_flags & TAP_VMNET) == 0) && 674 ((tp->tap_flags & TAP_READY) != TAP_READY)) { 675 struct mbuf *m; 676 677 /* Unlocked read. */ 678 TAPDEBUG("%s not ready, tap_flags = 0x%x\n", ifp->if_xname, 679 tp->tap_flags); 680 681 for (;;) { 682 IF_DEQUEUE(&ifp->if_snd, m); 683 if (m != NULL) { 684 m_freem(m); 685 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 686 } else 687 break; 688 } 689 mtx_unlock(&tp->tap_mtx); 690 691 return; 692 } 693 694 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 695 696 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 697 if (tp->tap_flags & TAP_RWAIT) { 698 tp->tap_flags &= ~TAP_RWAIT; 699 wakeup(tp); 700 } 701 702 if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) { 703 mtx_unlock(&tp->tap_mtx); 704 pgsigio(&tp->tap_sigio, SIGIO, 0); 705 mtx_lock(&tp->tap_mtx); 706 } 707 708 selwakeuppri(&tp->tap_rsel, PZERO+1); 709 KNOTE_LOCKED(&tp->tap_rsel.si_note, 0); 710 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); /* obytes are counted in ether_output */ 711 } 712 713 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 714 mtx_unlock(&tp->tap_mtx); 715 } /* tapifstart */ 716 717 718 /* 719 * tapioctl 720 * 721 * the cdevsw interface is now pretty minimal 722 */ 723 static int 724 tapioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 725 { 726 struct ifreq ifr; 727 struct tap_softc *tp = dev->si_drv1; 728 struct ifnet *ifp = tp->tap_ifp; 729 struct tapinfo *tapp = NULL; 730 int f; 731 int error; 732 #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 733 defined(COMPAT_FREEBSD4) 734 int ival; 735 #endif 736 737 switch (cmd) { 738 case TAPSIFINFO: 739 tapp = (struct tapinfo *)data; 740 if (ifp->if_type != tapp->type) 741 return (EPROTOTYPE); 742 mtx_lock(&tp->tap_mtx); 743 if (ifp->if_mtu != tapp->mtu) { 744 strlcpy(ifr.ifr_name, if_name(ifp), IFNAMSIZ); 745 ifr.ifr_mtu = tapp->mtu; 746 CURVNET_SET(ifp->if_vnet); 747 error = ifhwioctl(SIOCSIFMTU, ifp, 748 (caddr_t)&ifr, td); 749 CURVNET_RESTORE(); 750 if (error) { 751 mtx_unlock(&tp->tap_mtx); 752 return (error); 753 } 754 } 755 ifp->if_baudrate = tapp->baudrate; 756 mtx_unlock(&tp->tap_mtx); 757 break; 758 759 case TAPGIFINFO: 760 tapp = (struct tapinfo *)data; 761 mtx_lock(&tp->tap_mtx); 762 tapp->mtu = ifp->if_mtu; 763 tapp->type = ifp->if_type; 764 tapp->baudrate = ifp->if_baudrate; 765 mtx_unlock(&tp->tap_mtx); 766 break; 767 768 case TAPSDEBUG: 769 tapdebug = *(int *)data; 770 break; 771 772 case TAPGDEBUG: 773 *(int *)data = tapdebug; 774 break; 775 776 case TAPGIFNAME: { 777 struct ifreq *ifr = (struct ifreq *) data; 778 779 strlcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ); 780 } break; 781 782 case FIONBIO: 783 break; 784 785 case FIOASYNC: 786 mtx_lock(&tp->tap_mtx); 787 if (*(int *)data) 788 tp->tap_flags |= TAP_ASYNC; 789 else 790 tp->tap_flags &= ~TAP_ASYNC; 791 mtx_unlock(&tp->tap_mtx); 792 break; 793 794 case FIONREAD: 795 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 796 struct mbuf *mb; 797 798 IFQ_LOCK(&ifp->if_snd); 799 IFQ_POLL_NOLOCK(&ifp->if_snd, mb); 800 for (*(int *)data = 0; mb != NULL; 801 mb = mb->m_next) 802 *(int *)data += mb->m_len; 803 IFQ_UNLOCK(&ifp->if_snd); 804 } else 805 *(int *)data = 0; 806 break; 807 808 case FIOSETOWN: 809 return (fsetown(*(int *)data, &tp->tap_sigio)); 810 811 case FIOGETOWN: 812 *(int *)data = fgetown(&tp->tap_sigio); 813 return (0); 814 815 /* this is deprecated, FIOSETOWN should be used instead */ 816 case TIOCSPGRP: 817 return (fsetown(-(*(int *)data), &tp->tap_sigio)); 818 819 /* this is deprecated, FIOGETOWN should be used instead */ 820 case TIOCGPGRP: 821 *(int *)data = -fgetown(&tp->tap_sigio); 822 return (0); 823 824 /* VMware/VMnet port ioctl's */ 825 826 #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ 827 defined(COMPAT_FREEBSD4) 828 case _IO('V', 0): 829 ival = IOCPARM_IVAL(data); 830 data = (caddr_t)&ival; 831 /* FALLTHROUGH */ 832 #endif 833 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */ 834 f = *(int *)data; 835 f &= 0x0fff; 836 f &= ~IFF_CANTCHANGE; 837 f |= IFF_UP; 838 839 mtx_lock(&tp->tap_mtx); 840 ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE); 841 mtx_unlock(&tp->tap_mtx); 842 break; 843 844 case SIOCGIFADDR: /* get MAC address of the remote side */ 845 mtx_lock(&tp->tap_mtx); 846 bcopy(tp->ether_addr, data, sizeof(tp->ether_addr)); 847 mtx_unlock(&tp->tap_mtx); 848 break; 849 850 case SIOCSIFADDR: /* set MAC address of the remote side */ 851 mtx_lock(&tp->tap_mtx); 852 bcopy(data, tp->ether_addr, sizeof(tp->ether_addr)); 853 mtx_unlock(&tp->tap_mtx); 854 break; 855 856 default: 857 return (ENOTTY); 858 } 859 return (0); 860 } /* tapioctl */ 861 862 863 /* 864 * tapread 865 * 866 * the cdevsw read interface - reads a packet at a time, or at 867 * least as much of a packet as can be read 868 */ 869 static int 870 tapread(struct cdev *dev, struct uio *uio, int flag) 871 { 872 struct tap_softc *tp = dev->si_drv1; 873 struct ifnet *ifp = tp->tap_ifp; 874 struct mbuf *m = NULL; 875 int error = 0, len; 876 877 TAPDEBUG("%s reading, minor = %#x\n", ifp->if_xname, dev2unit(dev)); 878 879 mtx_lock(&tp->tap_mtx); 880 if ((tp->tap_flags & TAP_READY) != TAP_READY) { 881 mtx_unlock(&tp->tap_mtx); 882 883 /* Unlocked read. */ 884 TAPDEBUG("%s not ready. minor = %#x, tap_flags = 0x%x\n", 885 ifp->if_xname, dev2unit(dev), tp->tap_flags); 886 887 return (EHOSTDOWN); 888 } 889 890 tp->tap_flags &= ~TAP_RWAIT; 891 892 /* sleep until we get a packet */ 893 do { 894 IF_DEQUEUE(&ifp->if_snd, m); 895 896 if (m == NULL) { 897 if (flag & O_NONBLOCK) { 898 mtx_unlock(&tp->tap_mtx); 899 return (EWOULDBLOCK); 900 } 901 902 tp->tap_flags |= TAP_RWAIT; 903 error = mtx_sleep(tp, &tp->tap_mtx, PCATCH | (PZERO + 1), 904 "taprd", 0); 905 if (error) { 906 mtx_unlock(&tp->tap_mtx); 907 return (error); 908 } 909 } 910 } while (m == NULL); 911 mtx_unlock(&tp->tap_mtx); 912 913 /* feed packet to bpf */ 914 BPF_MTAP(ifp, m); 915 916 /* xfer packet to user space */ 917 while ((m != NULL) && (uio->uio_resid > 0) && (error == 0)) { 918 len = min(uio->uio_resid, m->m_len); 919 if (len == 0) 920 break; 921 922 error = uiomove(mtod(m, void *), len, uio); 923 m = m_free(m); 924 } 925 926 if (m != NULL) { 927 TAPDEBUG("%s dropping mbuf, minor = %#x\n", ifp->if_xname, 928 dev2unit(dev)); 929 m_freem(m); 930 } 931 932 return (error); 933 } /* tapread */ 934 935 936 /* 937 * tapwrite 938 * 939 * the cdevsw write interface - an atomic write is a packet - or else! 940 */ 941 static int 942 tapwrite(struct cdev *dev, struct uio *uio, int flag) 943 { 944 struct ether_header *eh; 945 struct tap_softc *tp = dev->si_drv1; 946 struct ifnet *ifp = tp->tap_ifp; 947 struct mbuf *m; 948 949 TAPDEBUG("%s writing, minor = %#x\n", 950 ifp->if_xname, dev2unit(dev)); 951 952 if (uio->uio_resid == 0) 953 return (0); 954 955 if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) { 956 TAPDEBUG("%s invalid packet len = %zd, minor = %#x\n", 957 ifp->if_xname, uio->uio_resid, dev2unit(dev)); 958 959 return (EIO); 960 } 961 962 if ((m = m_uiotombuf(uio, M_NOWAIT, 0, ETHER_ALIGN, 963 M_PKTHDR)) == NULL) { 964 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 965 return (ENOBUFS); 966 } 967 968 m->m_pkthdr.rcvif = ifp; 969 970 /* 971 * Only pass a unicast frame to ether_input(), if it would actually 972 * have been received by non-virtual hardware. 973 */ 974 if (m->m_len < sizeof(struct ether_header)) { 975 m_freem(m); 976 return (0); 977 } 978 eh = mtod(m, struct ether_header *); 979 980 if (eh && (ifp->if_flags & IFF_PROMISC) == 0 && 981 !ETHER_IS_MULTICAST(eh->ether_dhost) && 982 bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) { 983 m_freem(m); 984 return (0); 985 } 986 987 /* Pass packet up to parent. */ 988 CURVNET_SET(ifp->if_vnet); 989 (*ifp->if_input)(ifp, m); 990 CURVNET_RESTORE(); 991 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); /* ibytes are counted in parent */ 992 993 return (0); 994 } /* tapwrite */ 995 996 997 /* 998 * tappoll 999 * 1000 * the poll interface, this is only useful on reads 1001 * really. the write detect always returns true, write never blocks 1002 * anyway, it either accepts the packet or drops it 1003 */ 1004 static int 1005 tappoll(struct cdev *dev, int events, struct thread *td) 1006 { 1007 struct tap_softc *tp = dev->si_drv1; 1008 struct ifnet *ifp = tp->tap_ifp; 1009 int revents = 0; 1010 1011 TAPDEBUG("%s polling, minor = %#x\n", 1012 ifp->if_xname, dev2unit(dev)); 1013 1014 if (events & (POLLIN | POLLRDNORM)) { 1015 IFQ_LOCK(&ifp->if_snd); 1016 if (!IFQ_IS_EMPTY(&ifp->if_snd)) { 1017 TAPDEBUG("%s have data in queue. len = %d, " \ 1018 "minor = %#x\n", ifp->if_xname, 1019 ifp->if_snd.ifq_len, dev2unit(dev)); 1020 1021 revents |= (events & (POLLIN | POLLRDNORM)); 1022 } else { 1023 TAPDEBUG("%s waiting for data, minor = %#x\n", 1024 ifp->if_xname, dev2unit(dev)); 1025 1026 selrecord(td, &tp->tap_rsel); 1027 } 1028 IFQ_UNLOCK(&ifp->if_snd); 1029 } 1030 1031 if (events & (POLLOUT | POLLWRNORM)) 1032 revents |= (events & (POLLOUT | POLLWRNORM)); 1033 1034 return (revents); 1035 } /* tappoll */ 1036 1037 1038 /* 1039 * tap_kqfilter 1040 * 1041 * support for kevent() system call 1042 */ 1043 static int 1044 tapkqfilter(struct cdev *dev, struct knote *kn) 1045 { 1046 struct tap_softc *tp = dev->si_drv1; 1047 struct ifnet *ifp = tp->tap_ifp; 1048 1049 switch (kn->kn_filter) { 1050 case EVFILT_READ: 1051 TAPDEBUG("%s kqfilter: EVFILT_READ, minor = %#x\n", 1052 ifp->if_xname, dev2unit(dev)); 1053 kn->kn_fop = &tap_read_filterops; 1054 break; 1055 1056 case EVFILT_WRITE: 1057 TAPDEBUG("%s kqfilter: EVFILT_WRITE, minor = %#x\n", 1058 ifp->if_xname, dev2unit(dev)); 1059 kn->kn_fop = &tap_write_filterops; 1060 break; 1061 1062 default: 1063 TAPDEBUG("%s kqfilter: invalid filter, minor = %#x\n", 1064 ifp->if_xname, dev2unit(dev)); 1065 return (EINVAL); 1066 /* NOT REACHED */ 1067 } 1068 1069 kn->kn_hook = tp; 1070 knlist_add(&tp->tap_rsel.si_note, kn, 0); 1071 1072 return (0); 1073 } /* tapkqfilter */ 1074 1075 1076 /* 1077 * tap_kqread 1078 * 1079 * Return true if there is data in the interface queue 1080 */ 1081 static int 1082 tapkqread(struct knote *kn, long hint) 1083 { 1084 int ret; 1085 struct tap_softc *tp = kn->kn_hook; 1086 struct cdev *dev = tp->tap_dev; 1087 struct ifnet *ifp = tp->tap_ifp; 1088 1089 if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) { 1090 TAPDEBUG("%s have data in queue. len = %d, minor = %#x\n", 1091 ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev)); 1092 ret = 1; 1093 } else { 1094 TAPDEBUG("%s waiting for data, minor = %#x\n", 1095 ifp->if_xname, dev2unit(dev)); 1096 ret = 0; 1097 } 1098 1099 return (ret); 1100 } /* tapkqread */ 1101 1102 1103 /* 1104 * tap_kqwrite 1105 * 1106 * Always can write. Return the MTU in kn->data 1107 */ 1108 static int 1109 tapkqwrite(struct knote *kn, long hint) 1110 { 1111 struct tap_softc *tp = kn->kn_hook; 1112 struct ifnet *ifp = tp->tap_ifp; 1113 1114 kn->kn_data = ifp->if_mtu; 1115 1116 return (1); 1117 } /* tapkqwrite */ 1118 1119 1120 static void 1121 tapkqdetach(struct knote *kn) 1122 { 1123 struct tap_softc *tp = kn->kn_hook; 1124 1125 knlist_remove(&tp->tap_rsel.si_note, kn, 0); 1126 } /* tapkqdetach */ 1127
Cache object: deff8be3a5aa3aadbb6c6003125b8510
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