The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_eiface.c

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    1 /*-
    2  *
    3  * Copyright (c) 1999-2001, Vitaly V Belekhov
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice unmodified, this list of conditions, and the following
   11  *    disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/9.0/sys/netgraph/ng_eiface.c 222255 2011-05-24 14:10:33Z zec $
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/errno.h>
   34 #include <sys/kernel.h>
   35 #include <sys/malloc.h>
   36 #include <sys/mbuf.h>
   37 #include <sys/errno.h>
   38 #include <sys/proc.h>
   39 #include <sys/sockio.h>
   40 #include <sys/socket.h>
   41 #include <sys/syslog.h>
   42 
   43 #include <net/if.h>
   44 #include <net/if_media.h>
   45 #include <net/if_types.h>
   46 #include <net/netisr.h>
   47 #include <net/route.h>
   48 #include <net/vnet.h>
   49 
   50 #include <netgraph/ng_message.h>
   51 #include <netgraph/netgraph.h>
   52 #include <netgraph/ng_parse.h>
   53 #include <netgraph/ng_eiface.h>
   54 
   55 #include <net/bpf.h>
   56 #include <net/ethernet.h>
   57 #include <net/if_arp.h>
   58 
   59 static const struct ng_cmdlist ng_eiface_cmdlist[] = {
   60         {
   61           NGM_EIFACE_COOKIE,
   62           NGM_EIFACE_GET_IFNAME,
   63           "getifname",
   64           NULL,
   65           &ng_parse_string_type
   66         },
   67         {
   68           NGM_EIFACE_COOKIE,
   69           NGM_EIFACE_SET,
   70           "set",
   71           &ng_parse_enaddr_type,
   72           NULL
   73         },
   74         { 0 }
   75 };
   76 
   77 /* Node private data */
   78 struct ng_eiface_private {
   79         struct ifnet    *ifp;           /* per-interface network data */
   80         struct ifmedia  media;          /* (fake) media information */
   81         int             link_status;    /* fake */
   82         int             unit;           /* Interface unit number */
   83         node_p          node;           /* Our netgraph node */
   84         hook_p          ether;          /* Hook for ethernet stream */
   85 };
   86 typedef struct ng_eiface_private *priv_p;
   87 
   88 /* Interface methods */
   89 static void     ng_eiface_init(void *xsc);
   90 static void     ng_eiface_start(struct ifnet *ifp);
   91 static int      ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
   92 #ifdef DEBUG
   93 static void     ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
   94 #endif
   95 
   96 /* Netgraph methods */
   97 static int              ng_eiface_mod_event(module_t, int, void *);
   98 static ng_constructor_t ng_eiface_constructor;
   99 static ng_rcvmsg_t      ng_eiface_rcvmsg;
  100 static ng_shutdown_t    ng_eiface_rmnode;
  101 static ng_newhook_t     ng_eiface_newhook;
  102 static ng_rcvdata_t     ng_eiface_rcvdata;
  103 static ng_disconnect_t  ng_eiface_disconnect;
  104 
  105 /* Node type descriptor */
  106 static struct ng_type typestruct = {
  107         .version =      NG_ABI_VERSION,
  108         .name =         NG_EIFACE_NODE_TYPE,
  109         .mod_event =    ng_eiface_mod_event,
  110         .constructor =  ng_eiface_constructor,
  111         .rcvmsg =       ng_eiface_rcvmsg,
  112         .shutdown =     ng_eiface_rmnode,
  113         .newhook =      ng_eiface_newhook,
  114         .rcvdata =      ng_eiface_rcvdata,
  115         .disconnect =   ng_eiface_disconnect,
  116         .cmdlist =      ng_eiface_cmdlist
  117 };
  118 NETGRAPH_INIT(eiface, &typestruct);
  119 
  120 static VNET_DEFINE(struct unrhdr *, ng_eiface_unit);
  121 #define V_ng_eiface_unit                VNET(ng_eiface_unit)
  122 
  123 /************************************************************************
  124                         INTERFACE STUFF
  125  ************************************************************************/
  126 
  127 /*
  128  * Process an ioctl for the virtual interface
  129  */
  130 static int
  131 ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
  132 {
  133         const priv_p priv = (priv_p)ifp->if_softc;
  134         struct ifreq *const ifr = (struct ifreq *)data;
  135         int s, error = 0;
  136 
  137 #ifdef DEBUG
  138         ng_eiface_print_ioctl(ifp, command, data);
  139 #endif
  140         s = splimp();
  141         switch (command) {
  142 
  143         /* These two are mostly handled at a higher layer */
  144         case SIOCSIFADDR:
  145                 error = ether_ioctl(ifp, command, data);
  146                 break;
  147         case SIOCGIFADDR:
  148                 break;
  149 
  150         /* Set flags */
  151         case SIOCSIFFLAGS:
  152                 /*
  153                  * If the interface is marked up and stopped, then start it.
  154                  * If it is marked down and running, then stop it.
  155                  */
  156                 if (ifp->if_flags & IFF_UP) {
  157                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  158                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  159                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  160                         }
  161                 } else {
  162                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
  163                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
  164                                     IFF_DRV_OACTIVE);
  165                 }
  166                 break;
  167 
  168         /* Set the interface MTU */
  169         case SIOCSIFMTU:
  170                 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX ||
  171                     ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
  172                         error = EINVAL;
  173                 else
  174                         ifp->if_mtu = ifr->ifr_mtu;
  175                 break;
  176 
  177         /* (Fake) media type manipulation */
  178         case SIOCSIFMEDIA:
  179         case SIOCGIFMEDIA:
  180                 error = ifmedia_ioctl(ifp, ifr, &priv->media, command);
  181                 break;
  182 
  183         /* Stuff that's not supported */
  184         case SIOCADDMULTI:
  185         case SIOCDELMULTI:
  186                 error = 0;
  187                 break;
  188         case SIOCSIFPHYS:
  189                 error = EOPNOTSUPP;
  190                 break;
  191 
  192         default:
  193                 error = EINVAL;
  194                 break;
  195         }
  196         splx(s);
  197         return (error);
  198 }
  199 
  200 static void
  201 ng_eiface_init(void *xsc)
  202 {
  203         priv_p sc = xsc;
  204         struct ifnet *ifp = sc->ifp;
  205         int s;
  206 
  207         s = splimp();
  208 
  209         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  210         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  211 
  212         splx(s);
  213 }
  214 
  215 /*
  216  * We simply relay the packet to the "ether" hook, if it is connected.
  217  * We have been through the netgraph locking and are guaranteed to
  218  * be the only code running in this node at this time.
  219  */
  220 static void
  221 ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
  222 {
  223         struct ifnet *ifp = arg1;
  224         const priv_p priv = (priv_p)ifp->if_softc;
  225         int error = 0;
  226         struct mbuf *m;
  227 
  228         /* Check interface flags */
  229 
  230         if (!((ifp->if_flags & IFF_UP) &&
  231             (ifp->if_drv_flags & IFF_DRV_RUNNING)))
  232                 return;
  233 
  234         for (;;) {
  235                 /*
  236                  * Grab a packet to transmit.
  237                  */
  238                 IF_DEQUEUE(&ifp->if_snd, m);
  239 
  240                 /* If there's nothing to send, break. */
  241                 if (m == NULL)
  242                         break;
  243 
  244                 /*
  245                  * Berkeley packet filter.
  246                  * Pass packet to bpf if there is a listener.
  247                  * XXX is this safe? locking?
  248                  */
  249                 BPF_MTAP(ifp, m);
  250 
  251                 if (ifp->if_flags & IFF_MONITOR) {
  252                         ifp->if_ipackets++;
  253                         m_freem(m);
  254                         continue;
  255                 }
  256 
  257                 /*
  258                  * Send packet; if hook is not connected, mbuf will get
  259                  * freed.
  260                  */
  261                 NG_OUTBOUND_THREAD_REF();
  262                 NG_SEND_DATA_ONLY(error, priv->ether, m);
  263                 NG_OUTBOUND_THREAD_UNREF();
  264 
  265                 /* Update stats */
  266                 if (error == 0)
  267                         ifp->if_opackets++;
  268                 else
  269                         ifp->if_oerrors++;
  270         }
  271 
  272         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  273 
  274         return;
  275 }
  276 
  277 /*
  278  * This routine is called to deliver a packet out the interface.
  279  * We simply queue the netgraph version to be called when netgraph locking
  280  * allows it to happen.
  281  * Until we know what the rest of the networking code is doing for
  282  * locking, we don't know how we will interact with it.
  283  * Take comfort from the fact that the ifnet struct is part of our
  284  * private info and can't go away while we are queued.
  285  * [Though we don't know it is still there now....]
  286  * it is possible we don't gain anything from this because
  287  * we would like to get the mbuf and queue it as data
  288  * somehow, but we can't and if we did would we solve anything?
  289  */
  290 static void
  291 ng_eiface_start(struct ifnet *ifp)
  292 {
  293         const priv_p priv = (priv_p)ifp->if_softc;
  294 
  295         /* Don't do anything if output is active */
  296         if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
  297                 return;
  298 
  299         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
  300 
  301         if (ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0) != 0)
  302                 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  303 }
  304 
  305 #ifdef DEBUG
  306 /*
  307  * Display an ioctl to the virtual interface
  308  */
  309 
  310 static void
  311 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
  312 {
  313         char *str;
  314 
  315         switch (command & IOC_DIRMASK) {
  316         case IOC_VOID:
  317                 str = "IO";
  318                 break;
  319         case IOC_OUT:
  320                 str = "IOR";
  321                 break;
  322         case IOC_IN:
  323                 str = "IOW";
  324                 break;
  325         case IOC_INOUT:
  326                 str = "IORW";
  327                 break;
  328         default:
  329                 str = "IO??";
  330         }
  331         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
  332             ifp->if_xname,
  333             str,
  334             IOCGROUP(command),
  335             command & 0xff,
  336             IOCPARM_LEN(command));
  337 }
  338 #endif /* DEBUG */
  339 
  340 /*
  341  * ifmedia stuff
  342  */
  343 static int
  344 ng_eiface_mediachange(struct ifnet *ifp)
  345 {
  346         const priv_p priv = (priv_p)ifp->if_softc;
  347         struct ifmedia *ifm = &priv->media;
  348 
  349         if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
  350                 return (EINVAL);
  351         if (IFM_SUBTYPE(ifm->ifm_media) == IFM_AUTO)
  352                 ifp->if_baudrate = ifmedia_baudrate(IFM_ETHER | IFM_1000_T);
  353         else
  354                 ifp->if_baudrate = ifmedia_baudrate(ifm->ifm_media);
  355 
  356         return (0);
  357 }
  358 
  359 static void
  360 ng_eiface_mediastatus(struct ifnet *ifp, struct ifmediareq *ifmr)
  361 {
  362         const priv_p priv = (priv_p)ifp->if_softc;
  363         struct ifmedia *ifm = &priv->media;
  364 
  365         if (ifm->ifm_cur->ifm_media == (IFM_ETHER | IFM_AUTO) &&
  366             (priv->link_status & IFM_ACTIVE))
  367                 ifmr->ifm_active = IFM_ETHER | IFM_1000_T | IFM_FDX;
  368         else
  369                 ifmr->ifm_active = ifm->ifm_cur->ifm_media;
  370         ifmr->ifm_status = priv->link_status;
  371 
  372         return;
  373 }
  374 
  375 /************************************************************************
  376                         NETGRAPH NODE STUFF
  377  ************************************************************************/
  378 
  379 /*
  380  * Constructor for a node
  381  */
  382 static int
  383 ng_eiface_constructor(node_p node)
  384 {
  385         struct ifnet *ifp;
  386         priv_p priv;
  387         u_char eaddr[6] = {0,0,0,0,0,0};
  388 
  389         /* Allocate node and interface private structures */
  390         priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
  391 
  392         ifp = priv->ifp = if_alloc(IFT_ETHER);
  393         if (ifp == NULL) {
  394                 free(priv, M_NETGRAPH);
  395                 return (ENOSPC);
  396         }
  397 
  398         /* Link them together */
  399         ifp->if_softc = priv;
  400 
  401         /* Get an interface unit number */
  402         priv->unit = alloc_unr(V_ng_eiface_unit);
  403 
  404         /* Link together node and private info */
  405         NG_NODE_SET_PRIVATE(node, priv);
  406         priv->node = node;
  407 
  408         /* Initialize interface structure */
  409         if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
  410         ifp->if_init = ng_eiface_init;
  411         ifp->if_output = ether_output;
  412         ifp->if_start = ng_eiface_start;
  413         ifp->if_ioctl = ng_eiface_ioctl;
  414         ifp->if_snd.ifq_maxlen = ifqmaxlen;
  415         ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
  416         ifp->if_capabilities = IFCAP_VLAN_MTU | IFCAP_JUMBO_MTU;
  417         ifp->if_capenable = IFCAP_VLAN_MTU | IFCAP_JUMBO_MTU;
  418         ifmedia_init(&priv->media, 0, ng_eiface_mediachange,
  419             ng_eiface_mediastatus);
  420         ifmedia_add(&priv->media, IFM_ETHER | IFM_10_T, 0, NULL);
  421         ifmedia_add(&priv->media, IFM_ETHER | IFM_10_T | IFM_FDX, 0, NULL);
  422         ifmedia_add(&priv->media, IFM_ETHER | IFM_100_TX, 0, NULL);
  423         ifmedia_add(&priv->media, IFM_ETHER | IFM_100_TX | IFM_FDX, 0, NULL);
  424         ifmedia_add(&priv->media, IFM_ETHER | IFM_1000_T, 0, NULL);
  425         ifmedia_add(&priv->media, IFM_ETHER | IFM_1000_T | IFM_FDX, 0, NULL);
  426         ifmedia_add(&priv->media, IFM_ETHER | IFM_10G_T | IFM_FDX, 0, NULL);
  427         ifmedia_add(&priv->media, IFM_ETHER | IFM_AUTO, 0, NULL);
  428         ifmedia_set(&priv->media, IFM_ETHER | IFM_AUTO);
  429         priv->link_status = IFM_AVALID;
  430 
  431         /* Give this node the same name as the interface (if possible) */
  432         if (ng_name_node(node, ifp->if_xname) != 0)
  433                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
  434                     ifp->if_xname);
  435 
  436         /* Attach the interface */
  437         ether_ifattach(ifp, eaddr);
  438         ifp->if_baudrate = ifmedia_baudrate(IFM_ETHER | IFM_1000_T);
  439 
  440         /* Done */
  441         return (0);
  442 }
  443 
  444 /*
  445  * Give our ok for a hook to be added
  446  */
  447 static int
  448 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
  449 {
  450         priv_p priv = NG_NODE_PRIVATE(node);
  451         struct ifnet *ifp = priv->ifp;
  452 
  453         if (strcmp(name, NG_EIFACE_HOOK_ETHER))
  454                 return (EPFNOSUPPORT);
  455         if (priv->ether != NULL)
  456                 return (EISCONN);
  457         priv->ether = hook;
  458         NG_HOOK_SET_PRIVATE(hook, &priv->ether);
  459         NG_HOOK_SET_TO_INBOUND(hook);
  460 
  461         priv->link_status |= IFM_ACTIVE;
  462         CURVNET_SET_QUIET(ifp->if_vnet);
  463         if_link_state_change(ifp, LINK_STATE_UP);
  464         CURVNET_RESTORE();
  465 
  466         return (0);
  467 }
  468 
  469 /*
  470  * Receive a control message
  471  */
  472 static int
  473 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
  474 {
  475         const priv_p priv = NG_NODE_PRIVATE(node);
  476         struct ifnet *const ifp = priv->ifp;
  477         struct ng_mesg *resp = NULL;
  478         int error = 0;
  479         struct ng_mesg *msg;
  480 
  481         NGI_GET_MSG(item, msg);
  482         switch (msg->header.typecookie) {
  483         case NGM_EIFACE_COOKIE:
  484                 switch (msg->header.cmd) {
  485 
  486                 case NGM_EIFACE_SET:
  487                     {
  488                         if (msg->header.arglen != ETHER_ADDR_LEN) {
  489                                 error = EINVAL;
  490                                 break;
  491                         }
  492                         error = if_setlladdr(priv->ifp,
  493                             (u_char *)msg->data, ETHER_ADDR_LEN);
  494                         EVENTHANDLER_INVOKE(iflladdr_event, priv->ifp);
  495                         break;
  496                     }
  497 
  498                 case NGM_EIFACE_GET_IFNAME:
  499                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
  500                         if (resp == NULL) {
  501                                 error = ENOMEM;
  502                                 break;
  503                         }
  504                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
  505                         break;
  506 
  507                 case NGM_EIFACE_GET_IFADDRS:
  508                     {
  509                         struct ifaddr *ifa;
  510                         caddr_t ptr;
  511                         int buflen;
  512 
  513                         /* Determine size of response and allocate it */
  514                         buflen = 0;
  515                         if_addr_rlock(ifp);
  516                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
  517                                 buflen += SA_SIZE(ifa->ifa_addr);
  518                         NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
  519                         if (resp == NULL) {
  520                                 if_addr_runlock(ifp);
  521                                 error = ENOMEM;
  522                                 break;
  523                         }
  524 
  525                         /* Add addresses */
  526                         ptr = resp->data;
  527                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  528                                 const int len = SA_SIZE(ifa->ifa_addr);
  529 
  530                                 if (buflen < len) {
  531                                         log(LOG_ERR, "%s: len changed?\n",
  532                                             ifp->if_xname);
  533                                         break;
  534                                 }
  535                                 bcopy(ifa->ifa_addr, ptr, len);
  536                                 ptr += len;
  537                                 buflen -= len;
  538                         }
  539                         if_addr_runlock(ifp);
  540                         break;
  541                     }
  542 
  543                 default:
  544                         error = EINVAL;
  545                         break;
  546                 } /* end of inner switch() */
  547                 break;
  548         case NGM_FLOW_COOKIE:
  549                 CURVNET_SET_QUIET(ifp->if_vnet);
  550                 switch (msg->header.cmd) {
  551                 case NGM_LINK_IS_UP:
  552                         priv->link_status |= IFM_ACTIVE;
  553                         if_link_state_change(ifp, LINK_STATE_UP);
  554                         break;
  555                 case NGM_LINK_IS_DOWN:
  556                         priv->link_status &= ~IFM_ACTIVE;
  557                         if_link_state_change(ifp, LINK_STATE_DOWN);
  558                         break;
  559                 default:
  560                         break;
  561                 }
  562                 CURVNET_RESTORE();
  563                 break;
  564         default:
  565                 error = EINVAL;
  566                 break;
  567         }
  568         NG_RESPOND_MSG(error, node, item, resp);
  569         NG_FREE_MSG(msg);
  570         return (error);
  571 }
  572 
  573 /*
  574  * Receive data from a hook. Pass the packet to the ether_input routine.
  575  */
  576 static int
  577 ng_eiface_rcvdata(hook_p hook, item_p item)
  578 {
  579         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  580         struct ifnet *const ifp = priv->ifp;
  581         struct mbuf *m;
  582 
  583         NGI_GET_M(item, m);
  584         NG_FREE_ITEM(item);
  585 
  586         if (!((ifp->if_flags & IFF_UP) &&
  587             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
  588                 NG_FREE_M(m);
  589                 return (ENETDOWN);
  590         }
  591 
  592         if (m->m_len < ETHER_HDR_LEN) {
  593                 m = m_pullup(m, ETHER_HDR_LEN);
  594                 if (m == NULL)
  595                         return (EINVAL);
  596         }
  597 
  598         /* Note receiving interface */
  599         m->m_pkthdr.rcvif = ifp;
  600 
  601         /* Update interface stats */
  602         ifp->if_ipackets++;
  603 
  604         (*ifp->if_input)(ifp, m);
  605 
  606         /* Done */
  607         return (0);
  608 }
  609 
  610 /*
  611  * Shutdown processing.
  612  */
  613 static int
  614 ng_eiface_rmnode(node_p node)
  615 {
  616         const priv_p priv = NG_NODE_PRIVATE(node);
  617         struct ifnet *const ifp = priv->ifp;
  618 
  619         /*
  620          * the ifnet may be in a different vnet than the netgraph node, 
  621          * hence we have to change the current vnet context here.
  622          */
  623         CURVNET_SET_QUIET(ifp->if_vnet);
  624         ifmedia_removeall(&priv->media);
  625         ether_ifdetach(ifp);
  626         if_free(ifp);
  627         CURVNET_RESTORE();
  628         free_unr(V_ng_eiface_unit, priv->unit);
  629         free(priv, M_NETGRAPH);
  630         NG_NODE_SET_PRIVATE(node, NULL);
  631         NG_NODE_UNREF(node);
  632         return (0);
  633 }
  634 
  635 /*
  636  * Hook disconnection
  637  */
  638 static int
  639 ng_eiface_disconnect(hook_p hook)
  640 {
  641         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  642 
  643         priv->ether = NULL;
  644         priv->link_status &= ~IFM_ACTIVE;
  645         CURVNET_SET_QUIET(priv->ifp->if_vnet);
  646         if_link_state_change(priv->ifp, LINK_STATE_DOWN);
  647         CURVNET_RESTORE();
  648         return (0);
  649 }
  650 
  651 /*
  652  * Handle loading and unloading for this node type.
  653  */
  654 static int
  655 ng_eiface_mod_event(module_t mod, int event, void *data)
  656 {
  657         int error = 0;
  658 
  659         switch (event) {
  660         case MOD_LOAD:
  661         case MOD_UNLOAD:
  662                 break;
  663         default:
  664                 error = EOPNOTSUPP;
  665                 break;
  666         }
  667         return (error);
  668 }
  669 
  670 static void
  671 vnet_ng_eiface_init(const void *unused)
  672 {
  673 
  674         V_ng_eiface_unit = new_unrhdr(0, 0xffff, NULL);
  675 }
  676 VNET_SYSINIT(vnet_ng_eiface_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
  677     vnet_ng_eiface_init, NULL);
  678 
  679 static void
  680 vnet_ng_eiface_uninit(const void *unused)
  681 {
  682 
  683         delete_unrhdr(V_ng_eiface_unit);
  684 }
  685 VNET_SYSUNINIT(vnet_ng_eiface_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
  686    vnet_ng_eiface_uninit, NULL);

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