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/ttycom.h>
  58 #include <sys/uio.h>
  59 #include <sys/vnode.h>
  60 #include <sys/serialize.h>
  61
  62 #include <sys/thread2.h>
  63 #include <sys/mplock2.h>
  64
  65 #include <net/bpf.h>
  66 #include <net/ethernet.h>
  67 #include <net/if.h>
  68 #include <net/ifq_var.h>
  69 #include <net/if_arp.h>
  70 #include <net/if_clone.h>
  71 #include <net/route.h>
  72 #include <sys/devfs.h>
  73
  74 #include <netinet/in.h>
  75
  76 #include "if_tapvar.h"
  77 #include "if_tap.h"
  78
  79 #define TAP_IFFLAGS     (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST)
  80
  81 #define TAP_PREALLOCATED_UNITS  4
  82
  83 #define CDEV_NAME       "tap"
  84 #define CDEV_MAJOR      149
  85 #define TAPDEBUG        if (tapdebug) if_printf
  86
  87 #define TAP             "tap"
  88 #define VMNET           "vmnet"
  89 #define VMNET_DEV_MASK  0x00010000
  90
  91 DEVFS_DECLARE_CLONE_BITMAP(tap);
  92
  93 /* module */
  94 static int              tapmodevent     (module_t, int, void *);
  95
  96 /* device */
  97 static struct tap_softc *tapcreate(int, cdev_t);
  98 static void             tapdestroy(struct tap_softc *);
  99
 100 /* clone */
 101 static int              tap_clone_create(struct if_clone *, int);
 102 static void             tap_clone_destroy(struct ifnet *);
 103
 104
 105 /* network interface */
 106 static void             tapifstart      (struct ifnet *);
 107 static int              tapifioctl      (struct ifnet *, u_long, caddr_t,
 108                                          struct ucred *);
 109 static void             tapifinit       (void *);
 110 static void             tapifstop(struct tap_softc *, int);
 111 static void             tapifflags(struct tap_softc *);
 112
 113 /* character device */
 114 static d_open_t         tapopen;
 115 static d_clone_t        tapclone;
 116 static d_close_t        tapclose;
 117 static d_read_t         tapread;
 118 static d_write_t        tapwrite;
 119 static d_ioctl_t        tapioctl;
 120 static d_poll_t         tappoll;
 121 static d_kqfilter_t     tapkqfilter;
 122
 123 static struct dev_ops   tap_ops = {
 124         { CDEV_NAME, CDEV_MAJOR, 0 },
 125         .d_open =       tapopen,
 126         .d_close =      tapclose,
 127         .d_read =       tapread,
 128         .d_write =      tapwrite,
 129         .d_ioctl =      tapioctl,
 130         .d_poll =       tappoll,
 131         .d_kqfilter =   tapkqfilter
 132 };
 133
 134 static int              taprefcnt = 0;          /* module ref. counter   */
 135 static int              taplastunit = -1;       /* max. open unit number */
 136 static int              tapdebug = 0;           /* debug flag            */
 137 static int              tapuopen = 0;           /* all user open()       */
 138 static int              tapuponopen = 0;        /* IFF_UP       */
 139
 140 MALLOC_DECLARE(M_TAP);
 141 MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface");
 142 struct if_clone tap_cloner = IF_CLONE_INITIALIZER("tap",
 143                              tap_clone_create, tap_clone_destroy,
 144                              0, IF_MAXUNIT);
 145 static SLIST_HEAD(,tap_softc) tap_listhead =
 146         SLIST_HEAD_INITIALIZER(&tap_listhead);
 147
 148 SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, "");
 149 SYSCTL_DECL(_net_link);
 150 SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0,
 151             "Ethernet tunnel software network interface");
 152 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0,
 153            "Allow user to open /dev/tap (based on node permissions)");
 154 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0,
 155            "Bring interface up when /dev/tap is opened");
 156 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, "");
 157
 158 DEV_MODULE(if_tap, tapmodevent, NULL);
 159
 160 /*
 161  * tapmodevent
 162  *
 163  * module event handler
 164  */
 165 static int
 166 tapmodevent(module_t mod, int type, void *data)
 167 {
 168         static int attached = 0;
 169         struct tap_softc *tp, *ntp;
 170         int i;
 171
 172         switch (type) {
 173         case MOD_LOAD:
 174                 if (attached)
 175                         return (EEXIST);
 176
 177                 make_autoclone_dev(&tap_ops, &DEVFS_CLONE_BITMAP(tap), tapclone,
 178                                    UID_ROOT, GID_WHEEL, 0600, "tap");
 179                 SLIST_INIT(&tap_listhead);
 180                 if_clone_attach(&tap_cloner);
 181
 182                 for (i = 0; i < TAP_PREALLOCATED_UNITS; ++i) {
 183                         make_dev(&tap_ops, i, UID_ROOT, GID_WHEEL,
 184                                  0600, "tap%d", i);
 185                         devfs_clone_bitmap_set(&DEVFS_CLONE_BITMAP(tap), i);
 186                 }
 187
 188                 attached = 1;
 189                 break;
 190
 191         case MOD_UNLOAD:
 192                 if (taprefcnt > 0)
 193                         return (EBUSY);
 194
 195                 if_clone_detach(&tap_cloner);
 196
 197                 /* Maintain tap ifs in a local list */
 198                 SLIST_FOREACH_MUTABLE(tp, &tap_listhead, tap_link, ntp)
 199                         tapdestroy(tp);
 200
 201                 attached = 0;
 202
 203                 devfs_clone_handler_del("tap");
 204                 dev_ops_remove_all(&tap_ops);
 205                 devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(tap));
 206                 break;
 207
 208         default:
 209                 return (EOPNOTSUPP);
 210         }
 211
 212         return (0);
 213 } /* tapmodevent */
 214
 215
 216 /*
 217  * tapcreate - create or clone an interface
 218  */
 219 static struct tap_softc *
 220 tapcreate(int unit, cdev_t dev)
 221 {
 222         const char      *name = TAP;
 223         struct ifnet    *ifp;
 224         struct tap_softc *tp;
 225         uint8_t         ether_addr[ETHER_ADDR_LEN];
 226
 227         tp = kmalloc(sizeof(*tp), M_TAP, M_WAITOK | M_ZERO);
 228         dev->si_drv1 = tp;
 229         tp->tap_dev = dev;
 230         tp->tap_unit = unit;
 231
 232         reference_dev(dev);     /* tp association */
 233
 234         /* generate fake MAC address: 00 bd xx xx xx unit_no */
 235         ether_addr[0] = 0x00;
 236         ether_addr[1] = 0xbd;
 237         bcopy(&ticks, &ether_addr[2], 3);
 238         ether_addr[5] = (u_char)unit;
 239
 240         /* fill the rest and attach interface */
 241         ifp = &tp->tap_if;
 242         ifp->if_softc = tp;
 243
 244         if_initname(ifp, name, unit);
 245         if (unit > taplastunit)
 246                 taplastunit = unit;
 247
 248         ifp->if_init = tapifinit;
 249         ifp->if_start = tapifstart;
 250         ifp->if_ioctl = tapifioctl;
 251         ifp->if_mtu = ETHERMTU;
 252         ifp->if_flags = TAP_IFFLAGS;
 253         ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
 254         ifq_set_ready(&ifp->if_snd);
 255
 256         ether_ifattach(ifp, ether_addr, NULL);
 257
 258         tp->tap_flags |= TAP_INITED;
 259         tp->tap_devq.ifq_maxlen = ifqmaxlen;
 260
 261         SLIST_INSERT_HEAD(&tap_listhead, tp, tap_link);
 262
 263         TAPDEBUG(ifp, "created. minor = %#x\n", minor(dev));
 264         return (tp);
 265 }
 266
 267 static
 268 struct tap_softc *
 269 tapfind(int unit)
 270 {
 271         struct tap_softc *tp;
 272
 273         SLIST_FOREACH(tp, &tap_listhead, tap_link) {
 274                 if (tp->tap_unit == unit)
 275                         return(tp);
 276         }
 277         return (NULL);
 278 }
 279
 280 /*
 281  * tap_clone_create:
 282  *
 283  * Create a new tap instance via ifconfig.
 284  */
 285 static int
 286 tap_clone_create(struct if_clone *ifc __unused, int unit)
 287 {
 288         struct tap_softc *tp;
 289         cdev_t dev;
 290
 291         tp = tapfind(unit);
 292         if (tp == NULL) {
 293                 if (!devfs_clone_bitmap_chk(&DEVFS_CLONE_BITMAP(tap), unit)) {
 294                         devfs_clone_bitmap_set(&DEVFS_CLONE_BITMAP(tap), unit);
 295                         dev = make_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL,
 296                                            0600, "%s%d", TAP, unit);
 297                 } else {
 298                         dev = devfs_find_device_by_name("%s%d", TAP, unit);
 299                 }
 300
 301                 KKASSERT(dev != NULL);
 302                 tp = tapcreate(unit, dev);
 303         }
 304         tp->tap_flags |= TAP_CLONE;
 305         TAPDEBUG(&tp->tap_if, "clone created. minor = %#x tap_flags = 0x%x\n",
 306                  minor(tp->tap_dev), tp->tap_flags);
 307
 308         return (0);
 309 }
 310
 311 /*
 312  * tapopen
 313  *
 314  * to open tunnel. must be superuser
 315  */
 316 static int
 317 tapopen(struct dev_open_args *ap)
 318 {
 319         cdev_t dev = NULL;
 320         struct tap_softc *tp = NULL;
 321         struct ifnet *ifp = NULL;
 322         int error;
 323
 324         if (tapuopen == 0 &&
 325             (error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) != 0)
 326                 return (error);
 327
 328         get_mplock();
 329         dev = ap->a_head.a_dev;
 330         tp = dev->si_drv1;
 331         if (tp == NULL)
 332                 tp = tapcreate(minor(dev), dev);
 333         if (tp->tap_flags & TAP_OPEN) {
 334                 rel_mplock();
 335                 return (EBUSY);
 336         }
 337         ifp = &tp->arpcom.ac_if;
 338
 339         if ((tp->tap_flags & TAP_CLONE) == 0) {
 340                 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
 341
 342                 /* Announce the return of the interface. */
 343                 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
 344         }
 345
 346         bcopy(tp->arpcom.ac_enaddr, tp->ether_addr, sizeof(tp->ether_addr));
 347
 348         if (curthread->td_proc)
 349                 fsetown(curthread->td_proc->p_pid, &tp->tap_sigtd);
 350         tp->tap_flags |= TAP_OPEN;
 351         taprefcnt ++;
 352
 353         if (tapuponopen && (ifp->if_flags & IFF_UP) == 0) {
 354                 crit_enter();
 355                 if_up(ifp);
 356                 crit_exit();
 357
 358                 ifnet_serialize_all(ifp);
 359                 tapifflags(tp);
 360                 ifnet_deserialize_all(ifp);
 361
 362                 tp->tap_flags |= TAP_CLOSEDOWN;
 363         }
 364
 365         TAPDEBUG(ifp, "opened. minor = %#x, refcnt = %d, taplastunit = %d\n",
 366                  minor(tp->tap_dev), taprefcnt, taplastunit);
 367
 368         rel_mplock();
 369         return (0);
 370 }
 371
 372 static int
 373 tapclone(struct dev_clone_args *ap)
 374 {
 375         int unit;
 376
 377         unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(tap), 0);
 378         ap->a_dev = make_only_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL,
 379                                   0600, "%s%d", TAP, unit);
 380         tapcreate(unit, ap->a_dev);
 381         return (0);
 382 }
 383
 384 /*
 385  * tapclose
 386  *
 387  * close the device - mark i/f down & delete routing info
 388  */
 389 static int
 390 tapclose(struct dev_close_args *ap)
 391 {
 392         cdev_t dev = ap->a_head.a_dev;
 393         struct tap_softc *tp = dev->si_drv1;
 394         struct ifnet *ifp = &tp->tap_if;
 395         int clear_flags = 0;
 396
 397         get_mplock();
 398
 399         /* Junk all pending output */
 400         ifq_purge(&ifp->if_snd);
 401
 402         /*
 403          * Do not bring the interface down, and do not anything with
 404          * interface, if we are in VMnet mode. just close the device.
 405          *
 406          * If the interface is not cloned, we always bring it down.
 407          *
 408          * If the interface is cloned, then we bring it down during
 409          * closing only if it was brought up during opening.
 410          */
 411         if ((tp->tap_flags & TAP_VMNET) == 0 &&
 412             ((tp->tap_flags & TAP_CLONE) == 0 ||
 413              (tp->tap_flags & TAP_CLOSEDOWN))) {
 414                 if (ifp->if_flags & IFF_UP)
 415                         if_down(ifp);
 416                 clear_flags = 1;
 417         }
 418         ifnet_serialize_all(ifp);
 419         tapifstop(tp, clear_flags);
 420         ifnet_deserialize_all(ifp);
 421
 422         if ((tp->tap_flags & TAP_CLONE) == 0) {
 423                 if_purgeaddrs_nolink(ifp);
 424
 425                 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
 426
 427                 /* Announce the departure of the interface. */
 428                 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
 429         }
 430
 431         funsetown(tp->tap_sigio);
 432         tp->tap_sigio = NULL;
 433         selwakeup(&tp->tap_rsel);
 434
 435         tp->tap_flags &= ~TAP_OPEN;
 436         funsetown(tp->tap_sigtd);
 437         tp->tap_sigtd = NULL;
 438
 439         taprefcnt --;
 440         if (taprefcnt < 0) {
 441                 taprefcnt = 0;
 442                 if_printf(ifp, "minor = %#x, refcnt = %d is out of sync. "
 443                         "set refcnt to 0\n", minor(tp->tap_dev), taprefcnt);
 444         }
 445
 446         TAPDEBUG(ifp, "closed. minor = %#x, refcnt = %d, taplastunit = %d\n",
 447                  minor(tp->tap_dev), taprefcnt, taplastunit);
 448
 449         if (tp->tap_unit >= TAP_PREALLOCATED_UNITS)
 450                 tapdestroy(tp);
 451
 452         rel_mplock();
 453         return (0);
 454 }
 455
 456 /*
 457  * tapdestroy:
 458  *
 459  *      Destroy a tap instance.
 460  */
 461 static void
 462 tapdestroy(struct tap_softc *tp)
 463 {
 464         struct ifnet *ifp = &tp->arpcom.ac_if;
 465         cdev_t dev;
 466
 467         TAPDEBUG(ifp, "destroyed. minor = %#x, refcnt = %d, taplastunit = %d\n",
 468                  minor(tp->tap_dev), taprefcnt, taplastunit);
 469
 470         ifnet_serialize_all(ifp);
 471         tapifstop(tp, 1);
 472         ifnet_deserialize_all(ifp);
 473
 474         ether_ifdetach(ifp);
 475         SLIST_REMOVE(&tap_listhead, tp, tap_softc, tap_link);
 476
 477         dev = tp->tap_dev;
 478         tp->tap_dev = NULL;
 479         dev->si_drv1 = NULL;
 480
 481         release_dev(dev);       /* tp association */
 482
 483         /*
 484          * Also destroy the cloned device
 485          */
 486         if (tp->tap_unit >= TAP_PREALLOCATED_UNITS) {
 487                 destroy_dev(dev);
 488                 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(tap), tp->tap_unit);
 489         }
 490
 491         kfree(tp, M_TAP);
 492
 493         taplastunit--;
 494 }
 495
 496 /*
 497  * tap_clone_destroy:
 498  *
 499  *      Destroy a tap instance.
 500  */
 501 static void
 502 tap_clone_destroy(struct ifnet *ifp)
 503 {
 504         struct tap_softc *tp = ifp->if_softc;
 505
 506         TAPDEBUG(&tp->tap_if, "clone destroyed. minor = %#x tap_flags = 0x%x\n",
 507                  minor(tp->tap_dev), tp->tap_flags);
 508         if (tp->tap_flags & TAP_CLONE)
 509                 tapdestroy(tp);
 510 }
 511
 512 /*
 513  * tapifinit
 514  *
 515  * Network interface initialization function (called with if serializer held)
 516  *
 517  * MPSAFE
 518  */
 519 static void
 520 tapifinit(void *xtp)
 521 {
 522         struct tap_softc *tp = xtp;
 523         struct ifnet *ifp = &tp->tap_if;
 524
 525         TAPDEBUG(ifp, "initializing, minor = %#x tap_flags = 0x%x\n",
 526                  minor(tp->tap_dev), tp->tap_flags);
 527
 528         ASSERT_IFNET_SERIALIZED_ALL(ifp);
 529
 530         tapifstop(tp, 1);
 531
 532         ifp->if_flags |= IFF_RUNNING;
 533         ifp->if_flags &= ~IFF_OACTIVE;
 534
 535         /* attempt to start output */
 536         tapifstart(ifp);
 537 }
 538
 539
 540 /*
 541  * tapifioctl
 542  *
 543  * Process an ioctl request on network interface (called with if serializer
 544  * held).
 545  *
 546  * MPSAFE
 547  */
 548 static int
 549 tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
 550 {
 551         struct tap_softc        *tp = (struct tap_softc *)(ifp->if_softc);
 552         struct ifstat           *ifs = NULL;
 553         int                      dummy;
 554
 555         switch (cmd) {
 556                 case SIOCSIFADDR:
 557                 case SIOCGIFADDR:
 558                 case SIOCSIFMTU:
 559                         dummy = ether_ioctl(ifp, cmd, data);
 560                         return (dummy);
 561
 562                 case SIOCSIFFLAGS:
 563                         tapifflags(tp);
 564                         break;
 565
 566                 case SIOCADDMULTI: /* XXX -- just like vmnet does */
 567                 case SIOCDELMULTI:
 568                         break;
 569
 570                 case SIOCGIFSTATUS:
 571                         ifs = (struct ifstat *)data;
 572                         dummy = strlen(ifs->ascii);
 573                         if ((tp->tap_flags & TAP_OPEN) &&
 574                             dummy < sizeof(ifs->ascii)) {
 575                                 if (tp->tap_sigtd && tp->tap_sigtd->sio_proc) {
 576                                     ksnprintf(ifs->ascii + dummy,
 577                                         sizeof(ifs->ascii) - dummy,
 578                                         "\tOpened by pid %d\n",
 579                                         (int)tp->tap_sigtd->sio_proc->p_pid);
 580                                 } else {
 581                                     ksnprintf(ifs->ascii + dummy,
 582                                         sizeof(ifs->ascii) - dummy,
 583                                         "\tOpened by <unknown>\n");
 584                                 }
 585                         }
 586                         break;
 587
 588                 default:
 589                         return (EINVAL);
 590         }
 591
 592         return (0);
 593 }
 594
 595
 596 /*
 597  * tapifstart
 598  *
 599  * Queue packets from higher level ready to put out (called with if serializer
 600  * held)
 601  *
 602  * MPSAFE
 603  */
 604 static void
 605 tapifstart(struct ifnet *ifp)
 606 {
 607         struct tap_softc *tp = ifp->if_softc;
 608         struct ifqueue *ifq;
 609         struct mbuf *m;
 610         int has_data = 0;
 611
 612         TAPDEBUG(ifp, "starting, minor = %#x\n", minor(tp->tap_dev));
 613
 614         /*
 615          * do not junk pending output if we are in VMnet mode.
 616          * XXX: can this do any harm because of queue overflow?
 617          */
 618
 619         if (((tp->tap_flags & TAP_VMNET) == 0) &&
 620             ((tp->tap_flags & TAP_READY) != TAP_READY)) {
 621                 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
 622                          minor(tp->tap_dev), tp->tap_flags);
 623                 ifq_purge(&ifp->if_snd);
 624                 return;
 625         }
 626
 627         ifp->if_flags |= IFF_OACTIVE;
 628
 629         ifq = &tp->tap_devq;
 630         while ((m = ifq_dequeue(&ifp->if_snd, NULL)) != NULL) {
 631                 if (IF_QFULL(ifq)) {
 632                         IF_DROP(ifq);
 633                         ifp->if_oerrors++;
 634                         m_freem(m);
 635                 } else {
 636                         IF_ENQUEUE(ifq, m);
 637                         ifp->if_opackets++;
 638                         has_data = 1;
 639                 }
 640         }
 641
 642         if (has_data) {
 643                 if (tp->tap_flags & TAP_RWAIT) {
 644                         tp->tap_flags &= ~TAP_RWAIT;
 645                         wakeup((caddr_t)tp);
 646                 }
 647
 648                 get_mplock();
 649                 KNOTE(&tp->tap_rsel.si_note, 0);
 650                 rel_mplock();
 651
 652                 if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) {
 653                         get_mplock();
 654                         pgsigio(tp->tap_sigio, SIGIO, 0);
 655                         rel_mplock();
 656                 }
 657
 658                 /*
 659                  * selwakeup is not MPSAFE.  tapifstart is.
 660                  */
 661                 get_mplock();
 662                 selwakeup(&tp->tap_rsel);
 663                 rel_mplock();
 664         }
 665
 666         ifp->if_flags &= ~IFF_OACTIVE;
 667 }
 668
 669
 670 /*
 671  * tapioctl
 672  *
 673  * The ops interface is now pretty minimal.  Called via fileops with nothing
 674  * held.
 675  *
 676  * MPSAFE
 677  */
 678 static int
 679 tapioctl(struct dev_ioctl_args *ap)
 680 {
 681         cdev_t dev = ap->a_head.a_dev;
 682         caddr_t data = ap->a_data;
 683         struct tap_softc        *tp = dev->si_drv1;
 684         struct ifnet            *ifp = &tp->tap_if;
 685         struct tapinfo          *tapp = NULL;
 686         struct mbuf *mb;
 687         short f;
 688         int error;
 689
 690         ifnet_serialize_all(ifp);
 691         error = 0;
 692
 693         switch (ap->a_cmd) {
 694         case TAPSIFINFO:
 695                 tapp = (struct tapinfo *)data;
 696                 ifp->if_mtu = tapp->mtu;
 697                 ifp->if_type = tapp->type;
 698                 ifp->if_baudrate = tapp->baudrate;
 699                 break;
 700
 701         case TAPGIFINFO:
 702                 tapp = (struct tapinfo *)data;
 703                 tapp->mtu = ifp->if_mtu;
 704                 tapp->type = ifp->if_type;
 705                 tapp->baudrate = ifp->if_baudrate;
 706                 break;
 707
 708         case TAPSDEBUG:
 709                 tapdebug = *(int *)data;
 710                 break;
 711
 712         case TAPGDEBUG:
 713                 *(int *)data = tapdebug;
 714                 break;
 715
 716         case FIOASYNC:
 717                 if (*(int *)data)
 718                         tp->tap_flags |= TAP_ASYNC;
 719                 else
 720                         tp->tap_flags &= ~TAP_ASYNC;
 721                 break;
 722
 723         case FIONREAD:
 724                 *(int *)data = 0;
 725
 726                 /* Take a look at devq first */
 727                 IF_POLL(&tp->tap_devq, mb);
 728                 if (mb == NULL)
 729                         mb = ifq_poll(&ifp->if_snd);
 730
 731                 if (mb != NULL) {
 732                         for(; mb != NULL; mb = mb->m_next)
 733                                 *(int *)data += mb->m_len;
 734                 }
 735                 break;
 736
 737         case FIOSETOWN:
 738                 error = fsetown(*(int *)data, &tp->tap_sigio);
 739                 break;
 740
 741         case FIOGETOWN:
 742                 *(int *)data = fgetown(tp->tap_sigio);
 743                 break;
 744
 745         /* this is deprecated, FIOSETOWN should be used instead */
 746         case TIOCSPGRP:
 747                 error = fsetown(-(*(int *)data), &tp->tap_sigio);
 748                 break;
 749
 750         /* this is deprecated, FIOGETOWN should be used instead */
 751         case TIOCGPGRP:
 752                 *(int *)data = -fgetown(tp->tap_sigio);
 753                 break;
 754
 755         /* VMware/VMnet port ioctl's */
 756
 757         case SIOCGIFFLAGS:      /* get ifnet flags */
 758                 bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags));
 759                 break;
 760
 761         case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */
 762                 f = *(short *)data;
 763                 f &= 0x0fff;
 764                 f &= ~IFF_CANTCHANGE;
 765                 f |= IFF_UP;
 766                 ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE);
 767                 break;
 768
 769         case OSIOCGIFADDR:      /* get MAC address of the remote side */
 770         case SIOCGIFADDR:
 771                 bcopy(tp->ether_addr, data, sizeof(tp->ether_addr));
 772                 break;
 773
 774         case SIOCSIFADDR:       /* set MAC address of the remote side */
 775                 bcopy(data, tp->ether_addr, sizeof(tp->ether_addr));
 776                 break;
 777
 778         default:
 779                 error = ENOTTY;
 780                 break;
 781         }
 782         ifnet_deserialize_all(ifp);
 783         return (error);
 784 }
 785
 786
 787 /*
 788  * tapread
 789  *
 790  * The ops read interface - reads a packet at a time, or at
 791  * least as much of a packet as can be read.
 792  *
 793  * Called from the fileops interface with nothing held.
 794  *
 795  * MPSAFE
 796  */
 797 static int
 798 tapread(struct dev_read_args *ap)
 799 {
 800         cdev_t dev = ap->a_head.a_dev;
 801         struct uio *uio = ap->a_uio;
 802         struct tap_softc        *tp = dev->si_drv1;
 803         struct ifnet            *ifp = &tp->tap_if;
 804         struct mbuf             *m0 = NULL;
 805         int                      error = 0, len;
 806
 807         TAPDEBUG(ifp, "reading, minor = %#x\n", minor(tp->tap_dev));
 808
 809         if ((tp->tap_flags & TAP_READY) != TAP_READY) {
 810                 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
 811                          minor(tp->tap_dev), tp->tap_flags);
 812
 813                 return (EHOSTDOWN);
 814         }
 815
 816         tp->tap_flags &= ~TAP_RWAIT;
 817
 818         /* sleep until we get a packet */
 819         do {
 820                 ifnet_serialize_all(ifp);
 821                 IF_DEQUEUE(&tp->tap_devq, m0);
 822                 if (m0 == NULL) {
 823                         if (ap->a_ioflag & IO_NDELAY) {
 824                                 ifnet_deserialize_all(ifp);
 825                                 return (EWOULDBLOCK);
 826                         }
 827                         tp->tap_flags |= TAP_RWAIT;
 828                         tsleep_interlock(tp, PCATCH);
 829                         ifnet_deserialize_all(ifp);
 830                         error = tsleep(tp, PCATCH | PINTERLOCKED, "taprd", 0);
 831                         if (error)
 832                                 return (error);
 833                 } else {
 834                         ifnet_deserialize_all(ifp);
 835                 }
 836         } while (m0 == NULL);
 837
 838         BPF_MTAP(ifp, m0);
 839
 840         /* xfer packet to user space */
 841         while ((m0 != NULL) && (uio->uio_resid > 0) && (error == 0)) {
 842                 len = (int)szmin(uio->uio_resid, m0->m_len);
 843                 if (len == 0)
 844                         break;
 845
 846                 error = uiomove(mtod(m0, caddr_t), (size_t)len, uio);
 847                 m0 = m_free(m0);
 848         }
 849
 850         if (m0 != NULL) {
 851                 TAPDEBUG(ifp, "dropping mbuf, minor = %#x\n",
 852                          minor(tp->tap_dev));
 853                 m_freem(m0);
 854         }
 855
 856         return (error);
 857 }
 858
 859 /*
 860  * tapwrite
 861  *
 862  * The ops write interface - an atomic write is a packet - or else!
 863  *
 864  * Called from the fileops interface with nothing held.
 865  *
 866  * MPSAFE
 867  */
 868 static int
 869 tapwrite(struct dev_write_args *ap)
 870 {
 871         cdev_t dev = ap->a_head.a_dev;
 872         struct uio *uio = ap->a_uio;
 873         struct tap_softc        *tp = dev->si_drv1;
 874         struct ifnet            *ifp = &tp->tap_if;
 875         struct mbuf             *top = NULL, **mp = NULL, *m = NULL;
 876         int                     error = 0;
 877         size_t                  tlen, mlen;
 878
 879         TAPDEBUG(ifp, "writing, minor = %#x\n", minor(tp->tap_dev));
 880
 881         if ((tp->tap_flags & TAP_READY) != TAP_READY) {
 882                 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
 883                          minor(tp->tap_dev), tp->tap_flags);
 884                 return (EHOSTDOWN);
 885         }
 886
 887         if (uio->uio_resid == 0)
 888                 return (0);
 889
 890         if (uio->uio_resid > TAPMRU) {
 891                 TAPDEBUG(ifp, "invalid packet len = %zu, minor = %#x\n",
 892                          uio->uio_resid, minor(tp->tap_dev));
 893
 894                 return (EIO);
 895         }
 896         tlen = uio->uio_resid;
 897
 898         /* get a header mbuf */
 899         MGETHDR(m, MB_DONTWAIT, MT_DATA);
 900         if (m == NULL)
 901                 return (ENOBUFS);
 902         mlen = MHLEN;
 903
 904         top = 0;
 905         mp = &top;
 906         while ((error == 0) && (uio->uio_resid > 0)) {
 907                 m->m_len = (int)szmin(mlen, uio->uio_resid);
 908                 error = uiomove(mtod(m, caddr_t), (size_t)m->m_len, uio);
 909                 *mp = m;
 910                 mp = &m->m_next;
 911                 if (uio->uio_resid > 0) {
 912                         MGET(m, MB_DONTWAIT, MT_DATA);
 913                         if (m == NULL) {
 914                                 error = ENOBUFS;
 915                                 break;
 916                         }
 917                         mlen = MLEN;
 918                 }
 919         }
 920         if (error) {
 921                 ifp->if_ierrors ++;
 922                 if (top)
 923                         m_freem(top);
 924                 return (error);
 925         }
 926
 927         top->m_pkthdr.len = (int)tlen;
 928         top->m_pkthdr.rcvif = ifp;
 929
 930         /*
 931          * Ethernet bridge and bpf are handled in ether_input
 932          *
 933          * adjust mbuf and give packet to the ether_input
 934          */
 935         ifnet_serialize_all(ifp);
 936         ifp->if_input(ifp, top);
 937         ifp->if_ipackets ++; /* ibytes are counted in ether_input */
 938         ifnet_deserialize_all(ifp);
 939
 940         return (0);
 941 }
 942
 943 /*
 944  * tappoll
 945  *
 946  * The poll interface, this is only useful on reads really. The write
 947  * detect always returns true, write never blocks anyway, it either
 948  * accepts the packet or drops it
 949  *
 950  * Called from the fileops interface with nothing held.
 951  *
 952  * MPSAFE
 953  */
 954 static int
 955 tappoll(struct dev_poll_args *ap)
 956 {
 957         cdev_t dev = ap->a_head.a_dev;
 958         struct tap_softc        *tp = dev->si_drv1;
 959         struct ifnet            *ifp = &tp->tap_if;
 960         int                      revents = 0;
 961
 962         TAPDEBUG(ifp, "polling, minor = %#x\n", minor(tp->tap_dev));
 963
 964         if (ap->a_events & (POLLIN | POLLRDNORM)) {
 965                 if (!IF_QEMPTY(&tp->tap_devq)) {
 966                         TAPDEBUG(ifp,
 967                                  "has data in queue. minor = %#x\n",
 968                                  minor(tp->tap_dev));
 969
 970                         revents |= (ap->a_events & (POLLIN | POLLRDNORM));
 971                 } else {
 972                         TAPDEBUG(ifp, "waiting for data, minor = %#x\n",
 973                                  minor(tp->tap_dev));
 974
 975                         get_mplock();
 976                         selrecord(curthread, &tp->tap_rsel);
 977                         rel_mplock();
 978                 }
 979         }
 980
 981         if (ap->a_events & (POLLOUT | POLLWRNORM))
 982                 revents |= (ap->a_events & (POLLOUT | POLLWRNORM));
 983         ap->a_events = revents;
 984         return (0);
 985 }
 986
 987 /*
 988  * tapkqfilter - called from the fileops interface with nothing held
 989  *
 990  * MPSAFE
 991  */
 992 static int filt_tapread(struct knote *kn, long hint);
 993 static void filt_tapdetach(struct knote *kn);
 994 static struct filterops tapread_filtops =
 995         { 1, NULL, filt_tapdetach, filt_tapread };
 996
 997 static int
 998 tapkqfilter(struct dev_kqfilter_args *ap)
 999 {
1000         cdev_t dev = ap->a_head.a_dev;
1001         struct knote *kn = ap->a_kn;
1002         struct tap_softc *tp;
1003         struct klist *list;
1004         struct ifnet *ifp;
1005
1006         get_mplock();
1007         tp = dev->si_drv1;
1008         ifp = &tp->tap_if;
1009         ap->a_result =0;
1010
1011         switch(kn->kn_filter) {
1012         case EVFILT_READ:
1013                 list = &tp->tap_rsel.si_note;
1014                 kn->kn_fop = &tapread_filtops;
1015                 kn->kn_hook = (void *)tp;
1016                 break;
1017         case EVFILT_WRITE:
1018                 /* fall through */
1019         default:
1020                 ap->a_result = 1;
1021                 rel_mplock();
1022                 return(0);
1023         }
1024         crit_enter();
1025         SLIST_INSERT_HEAD(list, kn, kn_selnext);
1026         crit_exit();
1027         rel_mplock();
1028         return(0);
1029 }
1030
1031 static int
1032 filt_tapread(struct knote *kn, long hint)
1033 {
1034         struct tap_softc *tp = (void *)kn->kn_hook;
1035
1036         if (IF_QEMPTY(&tp->tap_devq) == 0)      /* XXX serializer */
1037                 return(1);
1038         else
1039                 return(0);
1040 }
1041
1042 static void
1043 filt_tapdetach(struct knote *kn)
1044 {
1045         struct tap_softc *tp = (void *)kn->kn_hook;
1046
1047         SLIST_REMOVE(&tp->tap_rsel.si_note, kn, knote, kn_selnext);
1048 }
1049
1050 static void
1051 tapifstop(struct tap_softc *tp, int clear_flags)
1052 {
1053         struct ifnet *ifp = &tp->tap_if;
1054
1055         ASSERT_IFNET_SERIALIZED_ALL(ifp);
1056         IF_DRAIN(&tp->tap_devq);
1057         tp->tap_flags &= ~TAP_CLOSEDOWN;
1058         if (clear_flags)
1059                 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
1060 }
1061
1062 static void
1063 tapifflags(struct tap_softc *tp)
1064 {
1065         struct ifnet *ifp = &tp->arpcom.ac_if;
1066
1067         ASSERT_IFNET_SERIALIZED_ALL(ifp);
1068         if ((tp->tap_flags & TAP_VMNET) == 0) {
1069                 /*
1070                  * Only for non-vmnet tap(4)
1071                  */
1072                 if (ifp->if_flags & IFF_UP) {
1073                         if ((ifp->if_flags & IFF_RUNNING) == 0)
1074                                 tapifinit(tp);
1075                 } else {
1076                         tapifstop(tp, 1);
1077                 }
1078         } else {
1079                 /* XXX */
1080         }
1081 }