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FreeBSD/Linux Kernel Cross Reference
sys/net/if_tap.c

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    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: releng/8.0/sys/net/if_tap.c 194990 2009-06-25 18:46:30Z kib $
   35  * $Id: if_tap.c,v 0.21 2000/07/23 21:46:02 max Exp $
   36  */
   37 
   38 #include "opt_compat.h"
   39 #include "opt_inet.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/conf.h>
   43 #include <sys/fcntl.h>
   44 #include <sys/filio.h>
   45 #include <sys/kernel.h>
   46 #include <sys/malloc.h>
   47 #include <sys/mbuf.h>
   48 #include <sys/module.h>
   49 #include <sys/poll.h>
   50 #include <sys/priv.h>
   51 #include <sys/proc.h>
   52 #include <sys/selinfo.h>
   53 #include <sys/signalvar.h>
   54 #include <sys/socket.h>
   55 #include <sys/sockio.h>
   56 #include <sys/sysctl.h>
   57 #include <sys/systm.h>
   58 #include <sys/ttycom.h>
   59 #include <sys/uio.h>
   60 #include <sys/queue.h>
   61 
   62 #include <net/bpf.h>
   63 #include <net/ethernet.h>
   64 #include <net/if.h>
   65 #include <net/if_clone.h>
   66 #include <net/if_dl.h>
   67 #include <net/route.h>
   68 #include <net/if_types.h>
   69 
   70 #include <netinet/in.h>
   71 
   72 #include <net/if_tapvar.h>
   73 #include <net/if_tap.h>
   74 
   75 
   76 #define CDEV_NAME       "tap"
   77 #define TAPDEBUG        if (tapdebug) printf
   78 
   79 #define TAP             "tap"
   80 #define VMNET           "vmnet"
   81 #define TAPMAXUNIT      0x7fff
   82 #define VMNET_DEV_MASK  CLONE_FLAG0
   83 
   84 /* module */
   85 static int              tapmodevent(module_t, int, void *);
   86 
   87 /* device */
   88 static void             tapclone(void *, struct ucred *, char *, int,
   89                             struct cdev **);
   90 static void             tapcreate(struct cdev *);
   91 
   92 /* network interface */
   93 static void             tapifstart(struct ifnet *);
   94 static int              tapifioctl(struct ifnet *, u_long, caddr_t);
   95 static void             tapifinit(void *);
   96 
   97 static int              tap_clone_create(struct if_clone *, int, caddr_t);
   98 static void             tap_clone_destroy(struct ifnet *);
   99 static int              vmnet_clone_create(struct if_clone *, int, caddr_t);
  100 static void             vmnet_clone_destroy(struct ifnet *);
  101 
  102 IFC_SIMPLE_DECLARE(tap, 0);
  103 IFC_SIMPLE_DECLARE(vmnet, 0);
  104 
  105 /* character device */
  106 static d_open_t         tapopen;
  107 static d_close_t        tapclose;
  108 static d_read_t         tapread;
  109 static d_write_t        tapwrite;
  110 static d_ioctl_t        tapioctl;
  111 static d_poll_t         tappoll;
  112 static d_kqfilter_t     tapkqfilter;
  113 
  114 /* kqueue(2) */
  115 static int              tapkqread(struct knote *, long);
  116 static int              tapkqwrite(struct knote *, long);
  117 static void             tapkqdetach(struct knote *);
  118 
  119 static struct filterops tap_read_filterops = {
  120         .f_isfd =       1,
  121         .f_attach =     NULL,
  122         .f_detach =     tapkqdetach,
  123         .f_event =      tapkqread,
  124 };
  125 
  126 static struct filterops tap_write_filterops = {
  127         .f_isfd =       1,
  128         .f_attach =     NULL,
  129         .f_detach =     tapkqdetach,
  130         .f_event =      tapkqwrite,
  131 };
  132 
  133 static struct cdevsw    tap_cdevsw = {
  134         .d_version =    D_VERSION,
  135         .d_flags =      D_PSEUDO | D_NEEDGIANT | D_NEEDMINOR,
  136         .d_open =       tapopen,
  137         .d_close =      tapclose,
  138         .d_read =       tapread,
  139         .d_write =      tapwrite,
  140         .d_ioctl =      tapioctl,
  141         .d_poll =       tappoll,
  142         .d_name =       CDEV_NAME,
  143         .d_kqfilter =   tapkqfilter,
  144 };
  145 
  146 /*
  147  * All global variables in if_tap.c are locked with tapmtx, with the
  148  * exception of tapdebug, which is accessed unlocked; tapclones is
  149  * static at runtime.
  150  */
  151 static struct mtx               tapmtx;
  152 static int                      tapdebug = 0;        /* debug flag   */
  153 static int                      tapuopen = 0;        /* allow user open() */
  154 static int                      tapuponopen = 0;    /* IFF_UP on open() */
  155 static int                      tapdclone = 1;  /* enable devfs cloning */
  156 static SLIST_HEAD(, tap_softc)  taphead;             /* first device */
  157 static struct clonedevs         *tapclones;
  158 
  159 MALLOC_DECLARE(M_TAP);
  160 MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface");
  161 SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, "");
  162 
  163 SYSCTL_DECL(_net_link);
  164 SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0,
  165     "Ethernet tunnel software network interface");
  166 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0,
  167         "Allow user to open /dev/tap (based on node permissions)");
  168 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0,
  169         "Bring interface up when /dev/tap is opened");
  170 SYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RW, &tapdclone, 0,
  171         "Enably legacy devfs interface creation");
  172 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, "");
  173 
  174 TUNABLE_INT("net.link.tap.devfs_cloning", &tapdclone);
  175 
  176 DEV_MODULE(if_tap, tapmodevent, NULL);
  177 
  178 static int
  179 tap_clone_create(struct if_clone *ifc, int unit, caddr_t params)
  180 {
  181         struct cdev *dev;
  182         int i;
  183         int extra;
  184 
  185         if (strcmp(ifc->ifc_name, VMNET) == 0)
  186                 extra = VMNET_DEV_MASK;
  187         else
  188                 extra = 0;
  189 
  190         /* find any existing device, or allocate new unit number */
  191         i = clone_create(&tapclones, &tap_cdevsw, &unit, &dev, extra);
  192         if (i) {
  193                 dev = make_dev(&tap_cdevsw, unit | extra,
  194                      UID_ROOT, GID_WHEEL, 0600, "%s%d", ifc->ifc_name, unit);
  195                 if (dev != NULL) {
  196                         dev_ref(dev);
  197                         dev->si_flags |= SI_CHEAPCLONE;
  198                 }
  199         }
  200 
  201         tapcreate(dev);
  202         return (0);
  203 }
  204 
  205 /* vmnet devices are tap devices in disguise */
  206 static int
  207 vmnet_clone_create(struct if_clone *ifc, int unit, caddr_t params)
  208 {
  209         return tap_clone_create(ifc, unit, params);
  210 }
  211 
  212 static void
  213 tap_destroy(struct tap_softc *tp)
  214 {
  215         struct ifnet *ifp = tp->tap_ifp;
  216         int s;
  217 
  218         /* Unlocked read. */
  219         KASSERT(!(tp->tap_flags & TAP_OPEN),
  220                 ("%s flags is out of sync", ifp->if_xname));
  221 
  222         knlist_destroy(&tp->tap_rsel.si_note);
  223         destroy_dev(tp->tap_dev);
  224         s = splimp();
  225         ether_ifdetach(ifp);
  226         if_free_type(ifp, IFT_ETHER);
  227         splx(s);
  228 
  229         mtx_destroy(&tp->tap_mtx);
  230         free(tp, M_TAP);
  231 }
  232 
  233 static void
  234 tap_clone_destroy(struct ifnet *ifp)
  235 {
  236         struct tap_softc *tp = ifp->if_softc;
  237 
  238         mtx_lock(&tapmtx);
  239         SLIST_REMOVE(&taphead, tp, tap_softc, tap_next);
  240         mtx_unlock(&tapmtx);
  241         tap_destroy(tp);
  242 }
  243 
  244 /* vmnet devices are tap devices in disguise */
  245 static void
  246 vmnet_clone_destroy(struct ifnet *ifp)
  247 {
  248         tap_clone_destroy(ifp);
  249 }
  250 
  251 /*
  252  * tapmodevent
  253  *
  254  * module event handler
  255  */
  256 static int
  257 tapmodevent(module_t mod, int type, void *data)
  258 {
  259         static eventhandler_tag  eh_tag = NULL;
  260         struct tap_softc        *tp = NULL;
  261         struct ifnet            *ifp = NULL;
  262 
  263         switch (type) {
  264         case MOD_LOAD:
  265 
  266                 /* intitialize device */
  267 
  268                 mtx_init(&tapmtx, "tapmtx", NULL, MTX_DEF);
  269                 SLIST_INIT(&taphead);
  270 
  271                 clone_setup(&tapclones);
  272                 eh_tag = EVENTHANDLER_REGISTER(dev_clone, tapclone, 0, 1000);
  273                 if (eh_tag == NULL) {
  274                         clone_cleanup(&tapclones);
  275                         mtx_destroy(&tapmtx);
  276                         return (ENOMEM);
  277                 }
  278                 if_clone_attach(&tap_cloner);
  279                 if_clone_attach(&vmnet_cloner);
  280                 return (0);
  281 
  282         case MOD_UNLOAD:
  283                 /*
  284                  * The EBUSY algorithm here can't quite atomically
  285                  * guarantee that this is race-free since we have to
  286                  * release the tap mtx to deregister the clone handler.
  287                  */
  288                 mtx_lock(&tapmtx);
  289                 SLIST_FOREACH(tp, &taphead, tap_next) {
  290                         mtx_lock(&tp->tap_mtx);
  291                         if (tp->tap_flags & TAP_OPEN) {
  292                                 mtx_unlock(&tp->tap_mtx);
  293                                 mtx_unlock(&tapmtx);
  294                                 return (EBUSY);
  295                         }
  296                         mtx_unlock(&tp->tap_mtx);
  297                 }
  298                 mtx_unlock(&tapmtx);
  299 
  300                 EVENTHANDLER_DEREGISTER(dev_clone, eh_tag);
  301                 if_clone_detach(&tap_cloner);
  302                 if_clone_detach(&vmnet_cloner);
  303 
  304                 mtx_lock(&tapmtx);
  305                 while ((tp = SLIST_FIRST(&taphead)) != NULL) {
  306                         SLIST_REMOVE_HEAD(&taphead, tap_next);
  307                         mtx_unlock(&tapmtx);
  308 
  309                         ifp = tp->tap_ifp;
  310 
  311                         TAPDEBUG("detaching %s\n", ifp->if_xname);
  312 
  313                         tap_destroy(tp);
  314                         mtx_lock(&tapmtx);
  315                 }
  316                 mtx_unlock(&tapmtx);
  317                 clone_cleanup(&tapclones);
  318 
  319                 mtx_destroy(&tapmtx);
  320 
  321                 break;
  322 
  323         default:
  324                 return (EOPNOTSUPP);
  325         }
  326 
  327         return (0);
  328 } /* tapmodevent */
  329 
  330 
  331 /*
  332  * DEVFS handler
  333  *
  334  * We need to support two kind of devices - tap and vmnet
  335  */
  336 static void
  337 tapclone(void *arg, struct ucred *cred, char *name, int namelen, struct cdev **dev)
  338 {
  339         char            devname[SPECNAMELEN + 1];
  340         int             i, unit, append_unit;
  341         int             extra;
  342 
  343         if (*dev != NULL)
  344                 return;
  345 
  346         if (!tapdclone ||
  347             (!tapuopen && priv_check_cred(cred, PRIV_NET_IFCREATE, 0) != 0))
  348                 return;
  349 
  350         unit = 0;
  351         append_unit = 0;
  352         extra = 0;
  353 
  354         /* We're interested in only tap/vmnet devices. */
  355         if (strcmp(name, TAP) == 0) {
  356                 unit = -1;
  357         } else if (strcmp(name, VMNET) == 0) {
  358                 unit = -1;
  359                 extra = VMNET_DEV_MASK;
  360         } else if (dev_stdclone(name, NULL, TAP, &unit) != 1) {
  361                 if (dev_stdclone(name, NULL, VMNET, &unit) != 1) {
  362                         return;
  363                 } else {
  364                         extra = VMNET_DEV_MASK;
  365                 }
  366         }
  367 
  368         if (unit == -1)
  369                 append_unit = 1;
  370 
  371         /* find any existing device, or allocate new unit number */
  372         i = clone_create(&tapclones, &tap_cdevsw, &unit, dev, extra);
  373         if (i) {
  374                 if (append_unit) {
  375                         /*
  376                          * We were passed 'tun' or 'tap', with no unit specified
  377                          * so we'll need to append it now.
  378                          */
  379                         namelen = snprintf(devname, sizeof(devname), "%s%d", name,
  380                             unit);
  381                         name = devname;
  382                 }
  383 
  384                 *dev = make_dev(&tap_cdevsw, unit | extra,
  385                      UID_ROOT, GID_WHEEL, 0600, "%s", name);
  386                 if (*dev != NULL) {
  387                         dev_ref(*dev);
  388                         (*dev)->si_flags |= SI_CHEAPCLONE;
  389                 }
  390         }
  391 
  392         if_clone_create(name, namelen, NULL);
  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, s;
  409         char                    *name = NULL;
  410         u_char                  eaddr[6];
  411 
  412         dev->si_flags &= ~SI_CHEAPCLONE;
  413 
  414         /* allocate driver storage and create device */
  415         tp = malloc(sizeof(*tp), M_TAP, M_WAITOK | M_ZERO);
  416         mtx_init(&tp->tap_mtx, "tap_mtx", NULL, MTX_DEF);
  417         mtx_lock(&tapmtx);
  418         SLIST_INSERT_HEAD(&taphead, tp, tap_next);
  419         mtx_unlock(&tapmtx);
  420 
  421         unit = dev2unit(dev);
  422 
  423         /* select device: tap or vmnet */
  424         if (unit & VMNET_DEV_MASK) {
  425                 name = VMNET;
  426                 tp->tap_flags |= TAP_VMNET;
  427         } else
  428                 name = TAP;
  429 
  430         unit &= TAPMAXUNIT;
  431 
  432         TAPDEBUG("tapcreate(%s%d). minor = %#x\n", name, unit, dev2unit(dev));
  433 
  434         /* generate fake MAC address: 00 bd xx xx xx unit_no */
  435         macaddr_hi = htons(0x00bd);
  436         macaddr_mid = (uint32_t) ticks;
  437         bcopy(&macaddr_hi, eaddr, sizeof(short));
  438         bcopy(&macaddr_mid, &eaddr[2], sizeof(uint32_t));
  439         eaddr[5] = (u_char)unit;
  440 
  441         /* fill the rest and attach interface */
  442         ifp = tp->tap_ifp = if_alloc(IFT_ETHER);
  443         if (ifp == NULL)
  444                 panic("%s%d: can not if_alloc()", name, unit);
  445         ifp->if_softc = tp;
  446         if_initname(ifp, name, unit);
  447         ifp->if_init = tapifinit;
  448         ifp->if_start = tapifstart;
  449         ifp->if_ioctl = tapifioctl;
  450         ifp->if_mtu = ETHERMTU;
  451         ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST);
  452         ifp->if_snd.ifq_maxlen = ifqmaxlen;
  453 
  454         dev->si_drv1 = tp;
  455         tp->tap_dev = dev;
  456 
  457         s = splimp();
  458         ether_ifattach(ifp, eaddr);
  459         splx(s);
  460 
  461         mtx_lock(&tp->tap_mtx);
  462         tp->tap_flags |= TAP_INITED;
  463         mtx_unlock(&tp->tap_mtx);
  464 
  465         knlist_init_mtx(&tp->tap_rsel.si_note, NULL);
  466 
  467         TAPDEBUG("interface %s is created. minor = %#x\n", 
  468                 ifp->if_xname, dev2unit(dev));
  469 } /* tapcreate */
  470 
  471 
  472 /*
  473  * tapopen
  474  *
  475  * to open tunnel. must be superuser
  476  */
  477 static int
  478 tapopen(struct cdev *dev, int flag, int mode, struct thread *td)
  479 {
  480         struct tap_softc        *tp = NULL;
  481         struct ifnet            *ifp = NULL;
  482         int                      error, s;
  483 
  484         if (tapuopen == 0) {
  485                 error = priv_check(td, PRIV_NET_TAP);
  486                 if (error)
  487                         return (error);
  488         }
  489 
  490         if ((dev2unit(dev) & CLONE_UNITMASK) > TAPMAXUNIT)
  491                 return (ENXIO);
  492 
  493         tp = dev->si_drv1;
  494 
  495         mtx_lock(&tp->tap_mtx);
  496         if (tp->tap_flags & TAP_OPEN) {
  497                 mtx_unlock(&tp->tap_mtx);
  498                 return (EBUSY);
  499         }
  500 
  501         bcopy(IF_LLADDR(tp->tap_ifp), tp->ether_addr, sizeof(tp->ether_addr));
  502         tp->tap_pid = td->td_proc->p_pid;
  503         tp->tap_flags |= TAP_OPEN;
  504         ifp = tp->tap_ifp;
  505         mtx_unlock(&tp->tap_mtx);
  506 
  507         s = splimp();
  508         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  509         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  510         if (tapuponopen)
  511                 ifp->if_flags |= IFF_UP;
  512         splx(s);
  513 
  514         TAPDEBUG("%s is open. minor = %#x\n", ifp->if_xname, dev2unit(dev));
  515 
  516         return (0);
  517 } /* tapopen */
  518 
  519 
  520 /*
  521  * tapclose
  522  *
  523  * close the device - mark i/f down & delete routing info
  524  */
  525 static int
  526 tapclose(struct cdev *dev, int foo, int bar, struct thread *td)
  527 {
  528         struct ifaddr           *ifa;
  529         struct tap_softc        *tp = dev->si_drv1;
  530         struct ifnet            *ifp = tp->tap_ifp;
  531         int                     s;
  532 
  533         /* junk all pending output */
  534         IF_DRAIN(&ifp->if_snd);
  535 
  536         /*
  537          * do not bring the interface down, and do not anything with
  538          * interface, if we are in VMnet mode. just close the device.
  539          */
  540 
  541         mtx_lock(&tp->tap_mtx);
  542         if (((tp->tap_flags & TAP_VMNET) == 0) && (ifp->if_flags & IFF_UP)) {
  543                 mtx_unlock(&tp->tap_mtx);
  544                 s = splimp();
  545                 if_down(ifp);
  546                 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
  547                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  548                                 rtinit(ifa, (int)RTM_DELETE, 0);
  549                         }
  550                         if_purgeaddrs(ifp);
  551                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
  552                 }
  553                 splx(s);
  554         } else
  555                 mtx_unlock(&tp->tap_mtx);
  556 
  557         funsetown(&tp->tap_sigio);
  558         selwakeuppri(&tp->tap_rsel, PZERO+1);
  559         KNOTE_UNLOCKED(&tp->tap_rsel.si_note, 0);
  560 
  561         mtx_lock(&tp->tap_mtx);
  562         tp->tap_flags &= ~TAP_OPEN;
  563         tp->tap_pid = 0;
  564         mtx_unlock(&tp->tap_mtx);
  565 
  566         TAPDEBUG("%s is closed. minor = %#x\n", 
  567                 ifp->if_xname, dev2unit(dev));
  568 
  569         return (0);
  570 } /* tapclose */
  571 
  572 
  573 /*
  574  * tapifinit
  575  *
  576  * network interface initialization function
  577  */
  578 static void
  579 tapifinit(void *xtp)
  580 {
  581         struct tap_softc        *tp = (struct tap_softc *)xtp;
  582         struct ifnet            *ifp = tp->tap_ifp;
  583 
  584         TAPDEBUG("initializing %s\n", ifp->if_xname);
  585 
  586         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  587         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  588 
  589         /* attempt to start output */
  590         tapifstart(ifp);
  591 } /* tapifinit */
  592 
  593 
  594 /*
  595  * tapifioctl
  596  *
  597  * Process an ioctl request on network interface
  598  */
  599 static int
  600 tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  601 {
  602         struct tap_softc        *tp = ifp->if_softc;
  603         struct ifreq            *ifr = (struct ifreq *)data;
  604         struct ifstat           *ifs = NULL;
  605         int                      s, dummy;
  606 
  607         switch (cmd) {
  608                 case SIOCSIFFLAGS: /* XXX -- just like vmnet does */
  609                 case SIOCADDMULTI:
  610                 case SIOCDELMULTI:
  611                         break;
  612 
  613                 case SIOCSIFMTU:
  614                         ifp->if_mtu = ifr->ifr_mtu;
  615                         break;
  616 
  617                 case SIOCGIFSTATUS:
  618                         s = splimp();
  619                         ifs = (struct ifstat *)data;
  620                         dummy = strlen(ifs->ascii);
  621                         mtx_lock(&tp->tap_mtx);
  622                         if (tp->tap_pid != 0 && dummy < sizeof(ifs->ascii))
  623                                 snprintf(ifs->ascii + dummy,
  624                                         sizeof(ifs->ascii) - dummy,
  625                                         "\tOpened by PID %d\n", tp->tap_pid);
  626                         mtx_unlock(&tp->tap_mtx);
  627                         splx(s);
  628                         break;
  629 
  630                 default:
  631                         s = splimp();
  632                         dummy = ether_ioctl(ifp, cmd, data);
  633                         splx(s);
  634                         return (dummy);
  635                         /* NOT REACHED */
  636         }
  637 
  638         return (0);
  639 } /* tapifioctl */
  640 
  641 
  642 /*
  643  * tapifstart
  644  *
  645  * queue packets from higher level ready to put out
  646  */
  647 static void
  648 tapifstart(struct ifnet *ifp)
  649 {
  650         struct tap_softc        *tp = ifp->if_softc;
  651         int                      s;
  652 
  653         TAPDEBUG("%s starting\n", ifp->if_xname);
  654 
  655         /*
  656          * do not junk pending output if we are in VMnet mode.
  657          * XXX: can this do any harm because of queue overflow?
  658          */
  659 
  660         mtx_lock(&tp->tap_mtx);
  661         if (((tp->tap_flags & TAP_VMNET) == 0) &&
  662             ((tp->tap_flags & TAP_READY) != TAP_READY)) {
  663                 struct mbuf     *m = NULL;
  664 
  665                 mtx_unlock(&tp->tap_mtx);
  666 
  667                 /* Unlocked read. */
  668                 TAPDEBUG("%s not ready, tap_flags = 0x%x\n", ifp->if_xname, 
  669                     tp->tap_flags);
  670 
  671                 s = splimp();
  672                 do {
  673                         IF_DEQUEUE(&ifp->if_snd, m);
  674                         if (m != NULL)
  675                                 m_freem(m);
  676                         ifp->if_oerrors ++;
  677                 } while (m != NULL);
  678                 splx(s);
  679 
  680                 return;
  681         }
  682         mtx_unlock(&tp->tap_mtx);
  683 
  684         s = splimp();
  685         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
  686 
  687         if (ifp->if_snd.ifq_len != 0) {
  688                 mtx_lock(&tp->tap_mtx);
  689                 if (tp->tap_flags & TAP_RWAIT) {
  690                         tp->tap_flags &= ~TAP_RWAIT;
  691                         wakeup(tp);
  692                 }
  693 
  694                 if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) {
  695                         mtx_unlock(&tp->tap_mtx);
  696                         pgsigio(&tp->tap_sigio, SIGIO, 0);
  697                 } else
  698                         mtx_unlock(&tp->tap_mtx);
  699 
  700                 selwakeuppri(&tp->tap_rsel, PZERO+1);
  701                 KNOTE_UNLOCKED(&tp->tap_rsel.si_note, 0);
  702                 ifp->if_opackets ++; /* obytes are counted in ether_output */
  703         }
  704 
  705         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  706         splx(s);
  707 } /* tapifstart */
  708 
  709 
  710 /*
  711  * tapioctl
  712  *
  713  * the cdevsw interface is now pretty minimal
  714  */
  715 static int
  716 tapioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
  717 {
  718         struct tap_softc        *tp = dev->si_drv1;
  719         struct ifnet            *ifp = tp->tap_ifp;
  720         struct tapinfo          *tapp = NULL;
  721         int                      s;
  722         int                      f;
  723 #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
  724     defined(COMPAT_FREEBSD4)
  725         int                      ival;
  726 #endif
  727 
  728         switch (cmd) {
  729                 case TAPSIFINFO:
  730                         s = splimp();
  731                         tapp = (struct tapinfo *)data;
  732                         ifp->if_mtu = tapp->mtu;
  733                         ifp->if_type = tapp->type;
  734                         ifp->if_baudrate = tapp->baudrate;
  735                         splx(s);
  736                         break;
  737 
  738                 case TAPGIFINFO:
  739                         tapp = (struct tapinfo *)data;
  740                         tapp->mtu = ifp->if_mtu;
  741                         tapp->type = ifp->if_type;
  742                         tapp->baudrate = ifp->if_baudrate;
  743                         break;
  744 
  745                 case TAPSDEBUG:
  746                         tapdebug = *(int *)data;
  747                         break;
  748 
  749                 case TAPGDEBUG:
  750                         *(int *)data = tapdebug;
  751                         break;
  752 
  753                 case TAPGIFNAME: {
  754                         struct ifreq    *ifr = (struct ifreq *) data;
  755 
  756                         strlcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ);
  757                         } break;
  758 
  759                 case FIONBIO:
  760                         break;
  761 
  762                 case FIOASYNC:
  763                         s = splimp();
  764                         mtx_lock(&tp->tap_mtx);
  765                         if (*(int *)data)
  766                                 tp->tap_flags |= TAP_ASYNC;
  767                         else
  768                                 tp->tap_flags &= ~TAP_ASYNC;
  769                         mtx_unlock(&tp->tap_mtx);
  770                         splx(s);
  771                         break;
  772 
  773                 case FIONREAD:
  774                         s = splimp();
  775                         if (ifp->if_snd.ifq_head) {
  776                                 struct mbuf     *mb = ifp->if_snd.ifq_head;
  777 
  778                                 for(*(int *)data = 0;mb != NULL;mb = mb->m_next)
  779                                         *(int *)data += mb->m_len;
  780                         } else
  781                                 *(int *)data = 0;
  782                         splx(s);
  783                         break;
  784 
  785                 case FIOSETOWN:
  786                         return (fsetown(*(int *)data, &tp->tap_sigio));
  787 
  788                 case FIOGETOWN:
  789                         *(int *)data = fgetown(&tp->tap_sigio);
  790                         return (0);
  791 
  792                 /* this is deprecated, FIOSETOWN should be used instead */
  793                 case TIOCSPGRP:
  794                         return (fsetown(-(*(int *)data), &tp->tap_sigio));
  795 
  796                 /* this is deprecated, FIOGETOWN should be used instead */
  797                 case TIOCGPGRP:
  798                         *(int *)data = -fgetown(&tp->tap_sigio);
  799                         return (0);
  800 
  801                 /* VMware/VMnet port ioctl's */
  802 
  803                 case SIOCGIFFLAGS:      /* get ifnet flags */
  804                         bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags));
  805                         break;
  806 
  807 #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
  808     defined(COMPAT_FREEBSD4)
  809                 case _IO('V', 0):
  810                         ival = IOCPARM_IVAL(data);
  811                         data = (caddr_t)&ival;
  812                         /* FALLTHROUGH */
  813 #endif
  814                 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */
  815                         f = *(int *)data;
  816                         f &= 0x0fff;
  817                         f &= ~IFF_CANTCHANGE;
  818                         f |= IFF_UP;
  819 
  820                         s = splimp();
  821                         ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE);
  822                         splx(s);
  823                         break;
  824 
  825                 case OSIOCGIFADDR:      /* get MAC address of the remote side */
  826                 case SIOCGIFADDR:
  827                         mtx_lock(&tp->tap_mtx);
  828                         bcopy(tp->ether_addr, data, sizeof(tp->ether_addr));
  829                         mtx_unlock(&tp->tap_mtx);
  830                         break;
  831 
  832                 case SIOCSIFADDR:       /* set MAC address of the remote side */
  833                         mtx_lock(&tp->tap_mtx);
  834                         bcopy(data, tp->ether_addr, sizeof(tp->ether_addr));
  835                         mtx_unlock(&tp->tap_mtx);
  836                         break;
  837 
  838                 default:
  839                         return (ENOTTY);
  840         }
  841         return (0);
  842 } /* tapioctl */
  843 
  844 
  845 /*
  846  * tapread
  847  *
  848  * the cdevsw read interface - reads a packet at a time, or at
  849  * least as much of a packet as can be read
  850  */
  851 static int
  852 tapread(struct cdev *dev, struct uio *uio, int flag)
  853 {
  854         struct tap_softc        *tp = dev->si_drv1;
  855         struct ifnet            *ifp = tp->tap_ifp;
  856         struct mbuf             *m = NULL;
  857         int                      error = 0, len, s;
  858 
  859         TAPDEBUG("%s reading, minor = %#x\n", ifp->if_xname, dev2unit(dev));
  860 
  861         mtx_lock(&tp->tap_mtx);
  862         if ((tp->tap_flags & TAP_READY) != TAP_READY) {
  863                 mtx_unlock(&tp->tap_mtx);
  864 
  865                 /* Unlocked read. */
  866                 TAPDEBUG("%s not ready. minor = %#x, tap_flags = 0x%x\n",
  867                         ifp->if_xname, dev2unit(dev), tp->tap_flags);
  868 
  869                 return (EHOSTDOWN);
  870         }
  871 
  872         tp->tap_flags &= ~TAP_RWAIT;
  873         mtx_unlock(&tp->tap_mtx);
  874 
  875         /* sleep until we get a packet */
  876         do {
  877                 s = splimp();
  878                 IF_DEQUEUE(&ifp->if_snd, m);
  879                 splx(s);
  880 
  881                 if (m == NULL) {
  882                         if (flag & O_NONBLOCK)
  883                                 return (EWOULDBLOCK);
  884 
  885                         mtx_lock(&tp->tap_mtx);
  886                         tp->tap_flags |= TAP_RWAIT;
  887                         mtx_unlock(&tp->tap_mtx);
  888                         error = tsleep(tp,PCATCH|(PZERO+1),"taprd",0);
  889                         if (error)
  890                                 return (error);
  891                 }
  892         } while (m == NULL);
  893 
  894         /* feed packet to bpf */
  895         BPF_MTAP(ifp, m);
  896 
  897         /* xfer packet to user space */
  898         while ((m != NULL) && (uio->uio_resid > 0) && (error == 0)) {
  899                 len = min(uio->uio_resid, m->m_len);
  900                 if (len == 0)
  901                         break;
  902 
  903                 error = uiomove(mtod(m, void *), len, uio);
  904                 m = m_free(m);
  905         }
  906 
  907         if (m != NULL) {
  908                 TAPDEBUG("%s dropping mbuf, minor = %#x\n", ifp->if_xname, 
  909                         dev2unit(dev));
  910                 m_freem(m);
  911         }
  912 
  913         return (error);
  914 } /* tapread */
  915 
  916 
  917 /*
  918  * tapwrite
  919  *
  920  * the cdevsw write interface - an atomic write is a packet - or else!
  921  */
  922 static int
  923 tapwrite(struct cdev *dev, struct uio *uio, int flag)
  924 {
  925         struct ether_header     *eh;
  926         struct tap_softc        *tp = dev->si_drv1;
  927         struct ifnet            *ifp = tp->tap_ifp;
  928         struct mbuf             *m;
  929 
  930         TAPDEBUG("%s writting, minor = %#x\n", 
  931                 ifp->if_xname, dev2unit(dev));
  932 
  933         if (uio->uio_resid == 0)
  934                 return (0);
  935 
  936         if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) {
  937                 TAPDEBUG("%s invalid packet len = %zd, minor = %#x\n",
  938                         ifp->if_xname, uio->uio_resid, dev2unit(dev));
  939 
  940                 return (EIO);
  941         }
  942 
  943         if ((m = m_uiotombuf(uio, M_DONTWAIT, 0, ETHER_ALIGN,
  944             M_PKTHDR)) == NULL) {
  945                 ifp->if_ierrors ++;
  946                 return (ENOBUFS);
  947         }
  948 
  949         m->m_pkthdr.rcvif = ifp;
  950 
  951         /*
  952          * Only pass a unicast frame to ether_input(), if it would actually
  953          * have been received by non-virtual hardware.
  954          */
  955         if (m->m_len < sizeof(struct ether_header)) {
  956                 m_freem(m);
  957                 return (0);
  958         }
  959         eh = mtod(m, struct ether_header *);
  960 
  961         if (eh && (ifp->if_flags & IFF_PROMISC) == 0 &&
  962             !ETHER_IS_MULTICAST(eh->ether_dhost) &&
  963             bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) {
  964                 m_freem(m);
  965                 return (0);
  966         }
  967 
  968         /* Pass packet up to parent. */
  969         (*ifp->if_input)(ifp, m);
  970         ifp->if_ipackets ++; /* ibytes are counted in parent */
  971 
  972         return (0);
  973 } /* tapwrite */
  974 
  975 
  976 /*
  977  * tappoll
  978  *
  979  * the poll interface, this is only useful on reads
  980  * really. the write detect always returns true, write never blocks
  981  * anyway, it either accepts the packet or drops it
  982  */
  983 static int
  984 tappoll(struct cdev *dev, int events, struct thread *td)
  985 {
  986         struct tap_softc        *tp = dev->si_drv1;
  987         struct ifnet            *ifp = tp->tap_ifp;
  988         int                      s, revents = 0;
  989 
  990         TAPDEBUG("%s polling, minor = %#x\n", 
  991                 ifp->if_xname, dev2unit(dev));
  992 
  993         s = splimp();
  994         if (events & (POLLIN | POLLRDNORM)) {
  995                 if (ifp->if_snd.ifq_len > 0) {
  996                         TAPDEBUG("%s have data in queue. len = %d, " \
  997                                 "minor = %#x\n", ifp->if_xname,
  998                                 ifp->if_snd.ifq_len, dev2unit(dev));
  999 
 1000                         revents |= (events & (POLLIN | POLLRDNORM));
 1001                 } else {
 1002                         TAPDEBUG("%s waiting for data, minor = %#x\n",
 1003                                 ifp->if_xname, dev2unit(dev));
 1004 
 1005                         selrecord(td, &tp->tap_rsel);
 1006                 }
 1007         }
 1008 
 1009         if (events & (POLLOUT | POLLWRNORM))
 1010                 revents |= (events & (POLLOUT | POLLWRNORM));
 1011 
 1012         splx(s);
 1013         return (revents);
 1014 } /* tappoll */
 1015 
 1016 
 1017 /*
 1018  * tap_kqfilter
 1019  *
 1020  * support for kevent() system call
 1021  */
 1022 static int
 1023 tapkqfilter(struct cdev *dev, struct knote *kn)
 1024 {
 1025         int                      s;
 1026         struct tap_softc        *tp = dev->si_drv1;
 1027         struct ifnet            *ifp = tp->tap_ifp;
 1028 
 1029         s = splimp();
 1030         switch (kn->kn_filter) {
 1031         case EVFILT_READ:
 1032                 TAPDEBUG("%s kqfilter: EVFILT_READ, minor = %#x\n",
 1033                         ifp->if_xname, dev2unit(dev));
 1034                 kn->kn_fop = &tap_read_filterops;
 1035                 break;
 1036 
 1037         case EVFILT_WRITE:
 1038                 TAPDEBUG("%s kqfilter: EVFILT_WRITE, minor = %#x\n",
 1039                         ifp->if_xname, dev2unit(dev));
 1040                 kn->kn_fop = &tap_write_filterops;
 1041                 break;
 1042 
 1043         default:
 1044                 TAPDEBUG("%s kqfilter: invalid filter, minor = %#x\n",
 1045                         ifp->if_xname, dev2unit(dev));
 1046                 splx(s);
 1047                 return (EINVAL);
 1048                 /* NOT REACHED */
 1049         }
 1050         splx(s);
 1051 
 1052         kn->kn_hook = (caddr_t) dev;
 1053         knlist_add(&tp->tap_rsel.si_note, kn, 0);
 1054 
 1055         return (0);
 1056 } /* tapkqfilter */
 1057 
 1058 
 1059 /*
 1060  * tap_kqread
 1061  * 
 1062  * Return true if there is data in the interface queue
 1063  */
 1064 static int
 1065 tapkqread(struct knote *kn, long hint)
 1066 {
 1067         int                      ret, s;
 1068         struct cdev             *dev = (struct cdev *)(kn->kn_hook);
 1069         struct tap_softc        *tp = dev->si_drv1;
 1070         struct ifnet            *ifp = tp->tap_ifp;
 1071 
 1072         s = splimp();
 1073         if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) {
 1074                 TAPDEBUG("%s have data in queue. len = %d, minor = %#x\n",
 1075                         ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev));
 1076                 ret = 1;
 1077         } else {
 1078                 TAPDEBUG("%s waiting for data, minor = %#x\n",
 1079                         ifp->if_xname, dev2unit(dev));
 1080                 ret = 0;
 1081         }
 1082         splx(s);
 1083 
 1084         return (ret);
 1085 } /* tapkqread */
 1086 
 1087 
 1088 /*
 1089  * tap_kqwrite
 1090  *
 1091  * Always can write. Return the MTU in kn->data
 1092  */
 1093 static int
 1094 tapkqwrite(struct knote *kn, long hint)
 1095 {
 1096         int                      s;
 1097         struct tap_softc        *tp = ((struct cdev *) kn->kn_hook)->si_drv1;
 1098         struct ifnet            *ifp = tp->tap_ifp;
 1099 
 1100         s = splimp();
 1101         kn->kn_data = ifp->if_mtu;
 1102         splx(s);
 1103 
 1104         return (1);
 1105 } /* tapkqwrite */
 1106 
 1107 
 1108 static void
 1109 tapkqdetach(struct knote *kn)
 1110 {
 1111         struct tap_softc        *tp = ((struct cdev *) kn->kn_hook)->si_drv1;
 1112 
 1113         knlist_remove(&tp->tap_rsel.si_note, kn, 0);
 1114 } /* tapkqdetach */
 1115 

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