sys/net/tap/if_tap.c

   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 1.41 2008/09/05 17:03:15 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/priv.h>
  52 #include <sys/signalvar.h>
  53 #include <sys/socket.h>
  54 #include <sys/sockio.h>
  55 #include <sys/sysctl.h>
  56 #include <sys/systm.h>
  57 #include <sys/thread2.h>
  58 #include <sys/ttycom.h>
  59 #include <sys/uio.h>
  60 #include <sys/vnode.h>
  61 #include <sys/serialize.h>
  62
  63 #include <net/bpf.h>
  64 #include <net/ethernet.h>
  65 #include <net/if.h>
  66 #include <net/ifq_var.h>
  67 #include <net/if_arp.h>
  68 #include <net/if_clone.h>
  69 #include <net/route.h>
  70
  71 #include <netinet/in.h>
  72
  73 #include "if_tapvar.h"
  74 #include "if_tap.h"
  75
  76 #define TAP_IFFLAGS     (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST)
  77
  78 #define CDEV_NAME       "tap"
  79 #define CDEV_MAJOR      149
  80 #define TAPDEBUG        if (tapdebug) if_printf
  81
  82 #define TAP             "tap"
  83 #define VMNET           "vmnet"
  84 #define VMNET_DEV_MASK  0x00010000
  85
  86 /* module */
  87 static int              tapmodevent     (module_t, int, void *);
  88
  89 /* device */
  90 static void             tapcreate       (cdev_t);
  91 static void             tapdestroy(struct tap_softc *);
  92
  93 /* clone */
  94 static int              tap_clone_create(struct if_clone *, int);
  95 static void             tap_clone_destroy(struct ifnet *);
  96
  97
  98 /* network interface */
  99 static void             tapifstart      (struct ifnet *);
 100 static int              tapifioctl      (struct ifnet *, u_long, caddr_t,
 101                                          struct ucred *);
 102 static void             tapifinit       (void *);
 103 static void             tapifstop(struct tap_softc *, int);
 104 static void             tapifflags(struct tap_softc *);
 105
 106 /* character device */
 107 static d_open_t         tapopen;
 108 static d_close_t        tapclose;
 109 static d_read_t         tapread;
 110 static d_write_t        tapwrite;
 111 static d_ioctl_t        tapioctl;
 112 static d_poll_t         tappoll;
 113 static d_kqfilter_t     tapkqfilter;
 114
 115 static struct dev_ops   tap_ops = {
 116         { CDEV_NAME, CDEV_MAJOR, 0 },
 117         .d_open =       tapopen,
 118         .d_close =      tapclose,
 119         .d_read =       tapread,
 120         .d_write =      tapwrite,
 121         .d_ioctl =      tapioctl,
 122         .d_poll =       tappoll,
 123         .d_kqfilter =   tapkqfilter
 124 };
 125
 126 static int              taprefcnt = 0;          /* module ref. counter   */
 127 static int              taplastunit = -1;       /* max. open unit number */
 128 static int              tapdebug = 0;           /* debug flag            */
 129 static int              tapuopen = 0;           /* all user open()       */
 130 static int              tapuponopen = 0;        /* IFF_UP       */
 131
 132 MALLOC_DECLARE(M_TAP);
 133 MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface");
 134 struct if_clone tap_cloner = IF_CLONE_INITIALIZER("tap",
 135                              tap_clone_create, tap_clone_destroy,
 136                              0, IF_MAXUNIT);
 137 static SLIST_HEAD(,tap_softc) tap_listhead =
 138         SLIST_HEAD_INITIALIZER(&tap_listhead);
 139
 140 SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, "");
 141 SYSCTL_DECL(_net_link);
 142 SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0,
 143             "Ethernet tunnel software network interface");
 144 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0,
 145            "Allow user to open /dev/tap (based on node permissions)");
 146 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0,
 147            "Bring interface up when /dev/tap is opened");
 148 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, "");
 149
 150 DEV_MODULE(if_tap, tapmodevent, NULL);
 151
 152 /*
 153  * tapmodevent
 154  *
 155  * module event handler
 156  */
 157 static int
 158 tapmodevent(module_t mod, int type, void *data)
 159 {
 160         static int attached = 0;
 161         struct tap_softc *tp, *ntp;
 162
 163         switch (type) {
 164         case MOD_LOAD:
 165                 if (attached)
 166                         return (EEXIST);
 167
 168                 dev_ops_add(&tap_ops, 0, 0);
 169                 SLIST_INIT(&tap_listhead);
 170                 if_clone_attach(&tap_cloner);
 171
 172                 attached = 1;
 173                 break;
 174
 175         case MOD_UNLOAD:
 176                 if (taprefcnt > 0)
 177                         return (EBUSY);
 178
 179                 if_clone_detach(&tap_cloner);
 180                 dev_ops_remove(&tap_ops, 0, 0);
 181
 182                 /* Maintain tap ifs in a local list */
 183                 SLIST_FOREACH_MUTABLE(tp, &tap_listhead, tap_link, ntp)
 184                         tapdestroy(tp);
 185
 186                 attached = 0;
 187                 break;
 188
 189         default:
 190                 return (EOPNOTSUPP);
 191         }
 192
 193         return (0);
 194 } /* tapmodevent */
 195
 196
 197 /*
 198  * tapcreate
 199  *
 200  * to create interface
 201  */
 202 static void
 203 tapcreate(cdev_t dev)
 204 {
 205         struct ifnet            *ifp = NULL;
 206         struct tap_softc        *tp = NULL;
 207         uint8_t                 ether_addr[ETHER_ADDR_LEN];
 208         int                      unit;
 209         char                    *name = NULL;
 210
 211         /* allocate driver storage and create device */
 212         MALLOC(tp, struct tap_softc *, sizeof(*tp), M_TAP, M_WAITOK | M_ZERO);
 213
 214         /* select device: tap or vmnet */
 215         if (minor(dev) & VMNET_DEV_MASK) {
 216                 name = VMNET;
 217                 unit = lminor(dev) & 0xff;
 218                 tp->tap_flags |= TAP_VMNET;
 219         }
 220         else {
 221                 name = TAP;
 222                 unit = lminor(dev);
 223         }
 224
 225         tp->tap_dev = make_dev(&tap_ops, minor(dev), UID_ROOT, GID_WHEEL,
 226                                                 0600, "%s%d", name, unit);
 227         tp->tap_dev->si_drv1 = dev->si_drv1 = tp;
 228         reference_dev(tp->tap_dev);     /* so we can destroy it later */
 229
 230         /* generate fake MAC address: 00 bd xx xx xx unit_no */
 231         ether_addr[0] = 0x00;
 232         ether_addr[1] = 0xbd;
 233         bcopy(&ticks, &ether_addr[2], 3);
 234         ether_addr[5] = (u_char)unit;
 235
 236         /* fill the rest and attach interface */
 237         ifp = &tp->tap_if;
 238         ifp->if_softc = tp;
 239
 240         if_initname(ifp, name, unit);
 241         if (unit > taplastunit)
 242                 taplastunit = unit;
 243
 244         ifp->if_init = tapifinit;
 245         ifp->if_start = tapifstart;
 246         ifp->if_ioctl = tapifioctl;
 247         ifp->if_mtu = ETHERMTU;
 248         ifp->if_flags = TAP_IFFLAGS;
 249         ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
 250         ifq_set_ready(&ifp->if_snd);
 251
 252         ether_ifattach(ifp, ether_addr, NULL);
 253
 254         tp->tap_flags |= TAP_INITED;
 255         tp->tap_devq.ifq_maxlen = ifqmaxlen;
 256
 257         SLIST_INSERT_HEAD(&tap_listhead, tp, tap_link);
 258
 259         TAPDEBUG(ifp, "created. minor = %#x\n", minor(tp->tap_dev));
 260 } /* tapcreate */
 261
 262 /*
 263  * tap_clone_create:
 264  *
 265  *      Create a new tap instance.
 266  */
 267 static int
 268 tap_clone_create(struct if_clone *ifc __unused, int unit)
 269 {
 270         struct tap_softc *tp = NULL;
 271         cdev_t dev;
 272
 273         dev = get_dev(CDEV_MAJOR, unit);
 274         tapcreate(dev);
 275
 276         tp = dev->si_drv1;
 277         tp->tap_flags |= TAP_CLONE;
 278         TAPDEBUG(&tp->tap_if, "clone created. minor = %#x tap_flags = 0x%x\n",
 279                  minor(tp->tap_dev), tp->tap_flags);
 280
 281         return (0);
 282 }
 283
 284 /*
 285  * tapopen
 286  *
 287  * to open tunnel. must be superuser
 288  */
 289 static int
 290 tapopen(struct dev_open_args *ap)
 291 {
 292         cdev_t dev = NULL;
 293         struct tap_softc *tp = NULL;
 294         struct ifnet *ifp = NULL;
 295         int error;
 296
 297         if (tapuopen == 0 &&
 298             (error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) != 0)
 299                 return (error);
 300
 301         get_mplock();
 302         dev = ap->a_head.a_dev;
 303         tp = dev->si_drv1;
 304         if (tp == NULL) {
 305                 tapcreate(dev);
 306                 tp = dev->si_drv1;
 307                 ifp = &tp->arpcom.ac_if;
 308         } else {
 309                 if (tp->tap_flags & TAP_OPEN) {
 310                         rel_mplock();
 311                         return (EBUSY);
 312                 }
 313                 ifp = &tp->arpcom.ac_if;
 314
 315                 if ((tp->tap_flags & TAP_CLONE) == 0) {
 316                         EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
 317
 318                         /* Announce the return of the interface. */
 319                         rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
 320                 }
 321         }
 322
 323         bcopy(tp->arpcom.ac_enaddr, tp->ether_addr, sizeof(tp->ether_addr));
 324
 325         if (curthread->td_proc)
 326                 fsetown(curthread->td_proc->p_pid, &tp->tap_sigtd);
 327         tp->tap_flags |= TAP_OPEN;
 328         taprefcnt ++;
 329
 330         if (tapuponopen && (ifp->if_flags & IFF_UP) == 0) {
 331                 crit_enter();
 332                 if_up(ifp);
 333                 crit_exit();
 334
 335                 ifnet_serialize_all(ifp);
 336                 tapifflags(tp);
 337                 ifnet_deserialize_all(ifp);
 338
 339                 tp->tap_flags |= TAP_CLOSEDOWN;
 340         }
 341
 342         TAPDEBUG(ifp, "opened. minor = %#x, refcnt = %d, taplastunit = %d\n",
 343                  minor(tp->tap_dev), taprefcnt, taplastunit);
 344
 345         rel_mplock();
 346         return (0);
 347 }
 348
 349
 350 /*
 351  * tapclose
 352  *
 353  * close the device - mark i/f down & delete routing info
 354  */
 355 static int
 356 tapclose(struct dev_close_args *ap)
 357 {
 358         cdev_t dev = ap->a_head.a_dev;
 359         struct tap_softc *tp = dev->si_drv1;
 360         struct ifnet *ifp = &tp->tap_if;
 361         int clear_flags = 0;
 362
 363         get_mplock();
 364
 365         /* Junk all pending output */
 366         ifq_purge(&ifp->if_snd);
 367
 368         /*
 369          * Do not bring the interface down, and do not anything with
 370          * interface, if we are in VMnet mode. just close the device.
 371          *
 372          * If the interface is not cloned, we always bring it down.
 373          *
 374          * If the interface is cloned, then we bring it down during
 375          * closing only if it was brought up during opening.
 376          */
 377         if ((tp->tap_flags & TAP_VMNET) == 0 &&
 378             ((tp->tap_flags & TAP_CLONE) == 0 ||
 379              (tp->tap_flags & TAP_CLOSEDOWN))) {
 380                 if (ifp->if_flags & IFF_UP)
 381                         if_down(ifp);
 382                 clear_flags = 1;
 383         }
 384         ifnet_serialize_all(ifp);
 385         tapifstop(tp, clear_flags);
 386         ifnet_deserialize_all(ifp);
 387
 388         if ((tp->tap_flags & TAP_CLONE) == 0) {
 389                 if_purgeaddrs_nolink(ifp);
 390
 391                 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
 392
 393                 /* Announce the departure of the interface. */
 394                 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
 395         }
 396
 397         funsetown(tp->tap_sigio);
 398         tp->tap_sigio = NULL;
 399         selwakeup(&tp->tap_rsel);
 400
 401         tp->tap_flags &= ~TAP_OPEN;
 402         funsetown(tp->tap_sigtd);
 403         tp->tap_sigtd = NULL;
 404
 405         taprefcnt --;
 406         if (taprefcnt < 0) {
 407                 taprefcnt = 0;
 408                 if_printf(ifp, "minor = %#x, refcnt = %d is out of sync. "
 409                         "set refcnt to 0\n", minor(tp->tap_dev), taprefcnt);
 410         }
 411
 412         TAPDEBUG(ifp, "closed. minor = %#x, refcnt = %d, taplastunit = %d\n",
 413                  minor(tp->tap_dev), taprefcnt, taplastunit);
 414
 415 #ifdef foo
 416         if ((tp->tap_flags & TAP_CLONE) == 0)
 417                 tapdestroy(tp);
 418 #endif
 419
 420         rel_mplock();
 421         return (0);
 422 }
 423
 424 /*
 425  * tapdestroy:
 426  *
 427  *      Destroy a tap instance.
 428  */
 429 static void
 430 tapdestroy(struct tap_softc *tp)
 431 {
 432         struct ifnet *ifp = &tp->arpcom.ac_if;
 433
 434         TAPDEBUG(ifp, "destroyed. minor = %#x, refcnt = %d, taplastunit = %d\n",
 435                  minor(tp->tap_dev), taprefcnt, taplastunit);
 436
 437         ifnet_serialize_all(ifp);
 438         tapifstop(tp, 1);
 439         ifnet_deserialize_all(ifp);
 440
 441         ether_ifdetach(ifp);
 442         SLIST_REMOVE(&tap_listhead, tp, tap_softc, tap_link);
 443
 444         destroy_dev(tp->tap_dev);
 445         kfree(tp, M_TAP);
 446
 447         taplastunit--;
 448 }
 449
 450 /*
 451  * tap_clone_destroy:
 452  *
 453  *      Destroy a tap instance.
 454  */
 455 static void
 456 tap_clone_destroy(struct ifnet *ifp)
 457 {
 458         struct tap_softc *tp = ifp->if_softc;
 459
 460         TAPDEBUG(&tp->tap_if, "clone destroyed. minor = %#x tap_flags = 0x%x\n",
 461                  minor(tp->tap_dev), tp->tap_flags);
 462         if (tp->tap_flags & TAP_CLONE)
 463                 tapdestroy(tp);
 464 }
 465
 466 /*
 467  * tapifinit
 468  *
 469  * Network interface initialization function (called with if serializer held)
 470  *
 471  * MPSAFE
 472  */
 473 static void
 474 tapifinit(void *xtp)
 475 {
 476         struct tap_softc *tp = xtp;
 477         struct ifnet *ifp = &tp->tap_if;
 478
 479         TAPDEBUG(ifp, "initializing, minor = %#x tap_flags = 0x%x\n",
 480                  minor(tp->tap_dev), tp->tap_flags);
 481
 482         ASSERT_IFNET_SERIALIZED_ALL(ifp);
 483
 484         tapifstop(tp, 1);
 485
 486         ifp->if_flags |= IFF_RUNNING;
 487         ifp->if_flags &= ~IFF_OACTIVE;
 488
 489         /* attempt to start output */
 490         tapifstart(ifp);
 491 }
 492
 493
 494 /*
 495  * tapifioctl
 496  *
 497  * Process an ioctl request on network interface (called with if serializer
 498  * held).
 499  *
 500  * MPSAFE
 501  */
 502 static int
 503 tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
 504 {
 505         struct tap_softc        *tp = (struct tap_softc *)(ifp->if_softc);
 506         struct ifstat           *ifs = NULL;
 507         int                      dummy;
 508
 509         switch (cmd) {
 510                 case SIOCSIFADDR:
 511                 case SIOCGIFADDR:
 512                 case SIOCSIFMTU:
 513                         dummy = ether_ioctl(ifp, cmd, data);
 514                         return (dummy);
 515
 516                 case SIOCSIFFLAGS:
 517                         tapifflags(tp);
 518                         break;
 519
 520                 case SIOCADDMULTI: /* XXX -- just like vmnet does */
 521                 case SIOCDELMULTI:
 522                         break;
 523
 524                 case SIOCGIFSTATUS:
 525                         ifs = (struct ifstat *)data;
 526                         dummy = strlen(ifs->ascii);
 527                         if ((tp->tap_flags & TAP_OPEN) &&
 528                             dummy < sizeof(ifs->ascii)) {
 529                                 if (tp->tap_sigtd && tp->tap_sigtd->sio_proc) {
 530                                     ksnprintf(ifs->ascii + dummy,
 531                                         sizeof(ifs->ascii) - dummy,
 532                                         "\tOpened by pid %d\n",
 533                                         (int)tp->tap_sigtd->sio_proc->p_pid);
 534                                 } else {
 535                                     ksnprintf(ifs->ascii + dummy,
 536                                         sizeof(ifs->ascii) - dummy,
 537                                         "\tOpened by <unknown>\n");
 538                                 }
 539                         }
 540                         break;
 541
 542                 default:
 543                         return (EINVAL);
 544         }
 545
 546         return (0);
 547 }
 548
 549
 550 /*
 551  * tapifstart
 552  *
 553  * Queue packets from higher level ready to put out (called with if serializer
 554  * held)
 555  *
 556  * MPSAFE
 557  */
 558 static void
 559 tapifstart(struct ifnet *ifp)
 560 {
 561         struct tap_softc *tp = ifp->if_softc;
 562         struct ifqueue *ifq;
 563         struct mbuf *m;
 564         int has_data = 0;
 565
 566         TAPDEBUG(ifp, "starting, minor = %#x\n", minor(tp->tap_dev));
 567
 568         /*
 569          * do not junk pending output if we are in VMnet mode.
 570          * XXX: can this do any harm because of queue overflow?
 571          */
 572
 573         if (((tp->tap_flags & TAP_VMNET) == 0) &&
 574             ((tp->tap_flags & TAP_READY) != TAP_READY)) {
 575                 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
 576                          minor(tp->tap_dev), tp->tap_flags);
 577                 ifq_purge(&ifp->if_snd);
 578                 return;
 579         }
 580
 581         ifp->if_flags |= IFF_OACTIVE;
 582
 583         ifq = &tp->tap_devq;
 584         while ((m = ifq_dequeue(&ifp->if_snd, NULL)) != NULL) {
 585                 if (IF_QFULL(ifq)) {
 586                         IF_DROP(ifq);
 587                         ifp->if_oerrors++;
 588                         m_freem(m);
 589                 } else {
 590                         IF_ENQUEUE(ifq, m);
 591                         ifp->if_opackets++;
 592                         has_data = 1;
 593                 }
 594         }
 595
 596         if (has_data) {
 597                 if (tp->tap_flags & TAP_RWAIT) {
 598                         tp->tap_flags &= ~TAP_RWAIT;
 599                         wakeup((caddr_t)tp);
 600                 }
 601
 602                 get_mplock();
 603                 KNOTE(&tp->tap_rsel.si_note, 0);
 604                 rel_mplock();
 605
 606                 if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) {
 607                         get_mplock();
 608                         pgsigio(tp->tap_sigio, SIGIO, 0);
 609                         rel_mplock();
 610                 }
 611
 612                 /*
 613                  * selwakeup is not MPSAFE.  tapifstart is.
 614                  */
 615                 get_mplock();
 616                 selwakeup(&tp->tap_rsel);
 617                 rel_mplock();
 618         }
 619
 620         ifp->if_flags &= ~IFF_OACTIVE;
 621 }
 622
 623
 624 /*
 625  * tapioctl
 626  *
 627  * The ops interface is now pretty minimal.  Called via fileops with nothing
 628  * held.
 629  *
 630  * MPSAFE
 631  */
 632 static int
 633 tapioctl(struct dev_ioctl_args *ap)
 634 {
 635         cdev_t dev = ap->a_head.a_dev;
 636         caddr_t data = ap->a_data;
 637         struct tap_softc        *tp = dev->si_drv1;
 638         struct ifnet            *ifp = &tp->tap_if;
 639         struct tapinfo          *tapp = NULL;
 640         struct mbuf *mb;
 641         short f;
 642         int error;
 643
 644         ifnet_serialize_all(ifp);
 645         error = 0;
 646
 647         switch (ap->a_cmd) {
 648         case TAPSIFINFO:
 649                 tapp = (struct tapinfo *)data;
 650                 ifp->if_mtu = tapp->mtu;
 651                 ifp->if_type = tapp->type;
 652                 ifp->if_baudrate = tapp->baudrate;
 653                 break;
 654
 655         case TAPGIFINFO:
 656                 tapp = (struct tapinfo *)data;
 657                 tapp->mtu = ifp->if_mtu;
 658                 tapp->type = ifp->if_type;
 659                 tapp->baudrate = ifp->if_baudrate;
 660                 break;
 661
 662         case TAPSDEBUG:
 663                 tapdebug = *(int *)data;
 664                 break;
 665
 666         case TAPGDEBUG:
 667                 *(int *)data = tapdebug;
 668                 break;
 669
 670         case FIOASYNC:
 671                 if (*(int *)data)
 672                         tp->tap_flags |= TAP_ASYNC;
 673                 else
 674                         tp->tap_flags &= ~TAP_ASYNC;
 675                 break;
 676
 677         case FIONREAD:
 678                 *(int *)data = 0;
 679
 680                 /* Take a look at devq first */
 681                 IF_POLL(&tp->tap_devq, mb);
 682                 if (mb == NULL)
 683                         mb = ifq_poll(&ifp->if_snd);
 684
 685                 if (mb != NULL) {
 686                         for(; mb != NULL; mb = mb->m_next)
 687                                 *(int *)data += mb->m_len;
 688                 }
 689                 break;
 690
 691         case FIOSETOWN:
 692                 error = fsetown(*(int *)data, &tp->tap_sigio);
 693                 break;
 694
 695         case FIOGETOWN:
 696                 *(int *)data = fgetown(tp->tap_sigio);
 697                 break;
 698
 699         /* this is deprecated, FIOSETOWN should be used instead */
 700         case TIOCSPGRP:
 701                 error = fsetown(-(*(int *)data), &tp->tap_sigio);
 702                 break;
 703
 704         /* this is deprecated, FIOGETOWN should be used instead */
 705         case TIOCGPGRP:
 706                 *(int *)data = -fgetown(tp->tap_sigio);
 707                 break;
 708
 709         /* VMware/VMnet port ioctl's */
 710
 711         case SIOCGIFFLAGS:      /* get ifnet flags */
 712                 bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags));
 713                 break;
 714
 715         case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */
 716                 f = *(short *)data;
 717                 f &= 0x0fff;
 718                 f &= ~IFF_CANTCHANGE;
 719                 f |= IFF_UP;
 720                 ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE);
 721                 break;
 722
 723         case OSIOCGIFADDR:      /* get MAC address of the remote side */
 724         case SIOCGIFADDR:
 725                 bcopy(tp->ether_addr, data, sizeof(tp->ether_addr));
 726                 break;
 727
 728         case SIOCSIFADDR:       /* set MAC address of the remote side */
 729                 bcopy(data, tp->ether_addr, sizeof(tp->ether_addr));
 730                 break;
 731
 732         default:
 733                 error = ENOTTY;
 734                 break;
 735         }
 736         ifnet_deserialize_all(ifp);
 737         return (error);
 738 }
 739
 740
 741 /*
 742  * tapread
 743  *
 744  * The ops read interface - reads a packet at a time, or at
 745  * least as much of a packet as can be read.
 746  *
 747  * Called from the fileops interface with nothing held.
 748  *
 749  * MPSAFE
 750  */
 751 static int
 752 tapread(struct dev_read_args *ap)
 753 {
 754         cdev_t dev = ap->a_head.a_dev;
 755         struct uio *uio = ap->a_uio;
 756         struct tap_softc        *tp = dev->si_drv1;
 757         struct ifnet            *ifp = &tp->tap_if;
 758         struct mbuf             *m0 = NULL;
 759         int                      error = 0, len;
 760
 761         TAPDEBUG(ifp, "reading, minor = %#x\n", minor(tp->tap_dev));
 762
 763         if ((tp->tap_flags & TAP_READY) != TAP_READY) {
 764                 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
 765                          minor(tp->tap_dev), tp->tap_flags);
 766
 767                 return (EHOSTDOWN);
 768         }
 769
 770         tp->tap_flags &= ~TAP_RWAIT;
 771
 772         /* sleep until we get a packet */
 773         do {
 774                 ifnet_serialize_all(ifp);
 775                 IF_DEQUEUE(&tp->tap_devq, m0);
 776                 if (m0 == NULL) {
 777                         if (ap->a_ioflag & IO_NDELAY) {
 778                                 ifnet_deserialize_all(ifp);
 779                                 return (EWOULDBLOCK);
 780                         }
 781                         tp->tap_flags |= TAP_RWAIT;
 782                         crit_enter();
 783                         tsleep_interlock(tp);
 784                         ifnet_deserialize_all(ifp);
 785                         error = tsleep(tp, PCATCH, "taprd", 0);
 786                         crit_exit();
 787                         if (error)
 788                                 return (error);
 789                 } else {
 790                         ifnet_deserialize_all(ifp);
 791                 }
 792         } while (m0 == NULL);
 793
 794         BPF_MTAP(ifp, m0);
 795
 796         /* xfer packet to user space */
 797         while ((m0 != NULL) && (uio->uio_resid > 0) && (error == 0)) {
 798                 len = min(uio->uio_resid, m0->m_len);
 799                 if (len == 0)
 800                         break;
 801
 802                 error = uiomove(mtod(m0, caddr_t), len, uio);
 803                 m0 = m_free(m0);
 804         }
 805
 806         if (m0 != NULL) {
 807                 TAPDEBUG(ifp, "dropping mbuf, minor = %#x\n",
 808                          minor(tp->tap_dev));
 809                 m_freem(m0);
 810         }
 811
 812         return (error);
 813 }
 814
 815 /*
 816  * tapwrite
 817  *
 818  * The ops write interface - an atomic write is a packet - or else!
 819  *
 820  * Called from the fileops interface with nothing held.
 821  *
 822  * MPSAFE
 823  */
 824 static int
 825 tapwrite(struct dev_write_args *ap)
 826 {
 827         cdev_t dev = ap->a_head.a_dev;
 828         struct uio *uio = ap->a_uio;
 829         struct tap_softc        *tp = dev->si_drv1;
 830         struct ifnet            *ifp = &tp->tap_if;
 831         struct mbuf             *top = NULL, **mp = NULL, *m = NULL;
 832         int                      error = 0, tlen, mlen;
 833
 834         TAPDEBUG(ifp, "writing, minor = %#x\n", minor(tp->tap_dev));
 835
 836         if ((tp->tap_flags & TAP_READY) != TAP_READY) {
 837                 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
 838                          minor(tp->tap_dev), tp->tap_flags);
 839                 return (EHOSTDOWN);
 840         }
 841
 842         if (uio->uio_resid == 0)
 843                 return (0);
 844
 845         if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) {
 846                 TAPDEBUG(ifp, "invalid packet len = %d, minor = %#x\n",
 847                          uio->uio_resid, minor(tp->tap_dev));
 848
 849                 return (EIO);
 850         }
 851         tlen = uio->uio_resid;
 852
 853         /* get a header mbuf */
 854         MGETHDR(m, MB_DONTWAIT, MT_DATA);
 855         if (m == NULL)
 856                 return (ENOBUFS);
 857         mlen = MHLEN;
 858
 859         top = 0;
 860         mp = &top;
 861         while ((error == 0) && (uio->uio_resid > 0)) {
 862                 m->m_len = min(mlen, uio->uio_resid);
 863                 error = uiomove(mtod(m, caddr_t), m->m_len, uio);
 864                 *mp = m;
 865                 mp = &m->m_next;
 866                 if (uio->uio_resid > 0) {
 867                         MGET(m, MB_DONTWAIT, MT_DATA);
 868                         if (m == NULL) {
 869                                 error = ENOBUFS;
 870                                 break;
 871                         }
 872                         mlen = MLEN;
 873                 }
 874         }
 875         if (error) {
 876                 ifp->if_ierrors ++;
 877                 if (top)
 878                         m_freem(top);
 879                 return (error);
 880         }
 881
 882         top->m_pkthdr.len = tlen;
 883         top->m_pkthdr.rcvif = ifp;
 884
 885         /*
 886          * Ethernet bridge and bpf are handled in ether_input
 887          *
 888          * adjust mbuf and give packet to the ether_input
 889          */
 890         ifnet_serialize_all(ifp);
 891         ifp->if_input(ifp, top);
 892         ifp->if_ipackets ++; /* ibytes are counted in ether_input */
 893         ifnet_deserialize_all(ifp);
 894
 895         return (0);
 896 }
 897
 898 /*
 899  * tappoll
 900  *
 901  * The poll interface, this is only useful on reads really. The write
 902  * detect always returns true, write never blocks anyway, it either
 903  * accepts the packet or drops it
 904  *
 905  * Called from the fileops interface with nothing held.
 906  *
 907  * MPSAFE
 908  */
 909 static int
 910 tappoll(struct dev_poll_args *ap)
 911 {
 912         cdev_t dev = ap->a_head.a_dev;
 913         struct tap_softc        *tp = dev->si_drv1;
 914         struct ifnet            *ifp = &tp->tap_if;
 915         int                      revents = 0;
 916
 917         TAPDEBUG(ifp, "polling, minor = %#x\n", minor(tp->tap_dev));
 918
 919         if (ap->a_events & (POLLIN | POLLRDNORM)) {
 920                 if (!IF_QEMPTY(&tp->tap_devq)) {
 921                         TAPDEBUG(ifp,
 922                                  "has data in queue. minor = %#x\n",
 923                                  minor(tp->tap_dev));
 924
 925                         revents |= (ap->a_events & (POLLIN | POLLRDNORM));
 926                 } else {
 927                         TAPDEBUG(ifp, "waiting for data, minor = %#x\n",
 928                                  minor(tp->tap_dev));
 929
 930                         get_mplock();
 931                         selrecord(curthread, &tp->tap_rsel);
 932                         rel_mplock();
 933                 }
 934         }
 935
 936         if (ap->a_events & (POLLOUT | POLLWRNORM))
 937                 revents |= (ap->a_events & (POLLOUT | POLLWRNORM));
 938         ap->a_events = revents;
 939         return (0);
 940 }
 941
 942 /*
 943  * tapkqfilter - called from the fileops interface with nothing held
 944  *
 945  * MPSAFE
 946  */
 947 static int filt_tapread(struct knote *kn, long hint);
 948 static void filt_tapdetach(struct knote *kn);
 949 static struct filterops tapread_filtops =
 950         { 1, NULL, filt_tapdetach, filt_tapread };
 951
 952 static int
 953 tapkqfilter(struct dev_kqfilter_args *ap)
 954 {
 955         cdev_t dev = ap->a_head.a_dev;
 956         struct knote *kn = ap->a_kn;
 957         struct tap_softc *tp;
 958         struct klist *list;
 959         struct ifnet *ifp;
 960
 961         get_mplock();
 962         tp = dev->si_drv1;
 963         ifp = &tp->tap_if;
 964         ap->a_result =0;
 965
 966         switch(kn->kn_filter) {
 967         case EVFILT_READ:
 968                 list = &tp->tap_rsel.si_note;
 969                 kn->kn_fop = &tapread_filtops;
 970                 kn->kn_hook = (void *)tp;
 971                 break;
 972         case EVFILT_WRITE:
 973                 /* fall through */
 974         default:
 975                 ap->a_result = 1;
 976                 rel_mplock();
 977                 return(0);
 978         }
 979         crit_enter();
 980         SLIST_INSERT_HEAD(list, kn, kn_selnext);
 981         crit_exit();
 982         rel_mplock();
 983         return(0);
 984 }
 985
 986 static int
 987 filt_tapread(struct knote *kn, long hint)
 988 {
 989         struct tap_softc *tp = (void *)kn->kn_hook;
 990
 991         if (IF_QEMPTY(&tp->tap_devq) == 0)      /* XXX serializer */
 992                 return(1);
 993         else
 994                 return(0);
 995 }
 996
 997 static void
 998 filt_tapdetach(struct knote *kn)
 999 {
1000         struct tap_softc *tp = (void *)kn->kn_hook;
1001
1002         SLIST_REMOVE(&tp->tap_rsel.si_note, kn, knote, kn_selnext);
1003 }
1004
1005 static void
1006 tapifstop(struct tap_softc *tp, int clear_flags)
1007 {
1008         struct ifnet *ifp = &tp->tap_if;
1009
1010         ASSERT_IFNET_SERIALIZED_ALL(ifp);
1011         IF_DRAIN(&tp->tap_devq);
1012         tp->tap_flags &= ~TAP_CLOSEDOWN;
1013         if (clear_flags)
1014                 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
1015 }
1016
1017 static void
1018 tapifflags(struct tap_softc *tp)
1019 {
1020         struct ifnet *ifp = &tp->arpcom.ac_if;
1021
1022         ASSERT_IFNET_SERIALIZED_ALL(ifp);
1023         if ((tp->tap_flags & TAP_VMNET) == 0) {
1024                 /*
1025                  * Only for non-vmnet tap(4)
1026                  */
1027                 if (ifp->if_flags & IFF_UP) {
1028                         if ((ifp->if_flags & IFF_RUNNING) == 0)
1029                                 tapifinit(tp);
1030                 } else {
1031                         tapifstop(tp, 1);
1032                 }
1033         } else {
1034                 /* XXX */
1035         }
1036 }