The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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/10.2/sys/netgraph/ng_eiface.c 241686 2012-10-18 13:57:24Z andre $
   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 error = 0;
  136 
  137 #ifdef DEBUG
  138         ng_eiface_print_ioctl(ifp, command, data);
  139 #endif
  140         switch (command) {
  141 
  142         /* These two are mostly handled at a higher layer */
  143         case SIOCSIFADDR:
  144                 error = ether_ioctl(ifp, command, data);
  145                 break;
  146         case SIOCGIFADDR:
  147                 break;
  148 
  149         /* Set flags */
  150         case SIOCSIFFLAGS:
  151                 /*
  152                  * If the interface is marked up and stopped, then start it.
  153                  * If it is marked down and running, then stop it.
  154                  */
  155                 if (ifp->if_flags & IFF_UP) {
  156                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  157                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  158                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  159                         }
  160                 } else {
  161                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
  162                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
  163                                     IFF_DRV_OACTIVE);
  164                 }
  165                 break;
  166 
  167         /* Set the interface MTU */
  168         case SIOCSIFMTU:
  169                 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX ||
  170                     ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
  171                         error = EINVAL;
  172                 else
  173                         ifp->if_mtu = ifr->ifr_mtu;
  174                 break;
  175 
  176         /* (Fake) media type manipulation */
  177         case SIOCSIFMEDIA:
  178         case SIOCGIFMEDIA:
  179                 error = ifmedia_ioctl(ifp, ifr, &priv->media, command);
  180                 break;
  181 
  182         /* Stuff that's not supported */
  183         case SIOCADDMULTI:
  184         case SIOCDELMULTI:
  185                 error = 0;
  186                 break;
  187         case SIOCSIFPHYS:
  188                 error = EOPNOTSUPP;
  189                 break;
  190 
  191         default:
  192                 error = EINVAL;
  193                 break;
  194         }
  195         return (error);
  196 }
  197 
  198 static void
  199 ng_eiface_init(void *xsc)
  200 {
  201         priv_p sc = xsc;
  202         struct ifnet *ifp = sc->ifp;
  203 
  204         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  205         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  206 }
  207 
  208 /*
  209  * We simply relay the packet to the "ether" hook, if it is connected.
  210  * We have been through the netgraph locking and are guaranteed to
  211  * be the only code running in this node at this time.
  212  */
  213 static void
  214 ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
  215 {
  216         struct ifnet *ifp = arg1;
  217         const priv_p priv = (priv_p)ifp->if_softc;
  218         int error = 0;
  219         struct mbuf *m;
  220 
  221         /* Check interface flags */
  222 
  223         if (!((ifp->if_flags & IFF_UP) &&
  224             (ifp->if_drv_flags & IFF_DRV_RUNNING)))
  225                 return;
  226 
  227         for (;;) {
  228                 /*
  229                  * Grab a packet to transmit.
  230                  */
  231                 IF_DEQUEUE(&ifp->if_snd, m);
  232 
  233                 /* If there's nothing to send, break. */
  234                 if (m == NULL)
  235                         break;
  236 
  237                 /*
  238                  * Berkeley packet filter.
  239                  * Pass packet to bpf if there is a listener.
  240                  * XXX is this safe? locking?
  241                  */
  242                 BPF_MTAP(ifp, m);
  243 
  244                 if (ifp->if_flags & IFF_MONITOR) {
  245                         ifp->if_ipackets++;
  246                         m_freem(m);
  247                         continue;
  248                 }
  249 
  250                 /*
  251                  * Send packet; if hook is not connected, mbuf will get
  252                  * freed.
  253                  */
  254                 NG_OUTBOUND_THREAD_REF();
  255                 NG_SEND_DATA_ONLY(error, priv->ether, m);
  256                 NG_OUTBOUND_THREAD_UNREF();
  257 
  258                 /* Update stats */
  259                 if (error == 0)
  260                         ifp->if_opackets++;
  261                 else
  262                         ifp->if_oerrors++;
  263         }
  264 
  265         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  266 
  267         return;
  268 }
  269 
  270 /*
  271  * This routine is called to deliver a packet out the interface.
  272  * We simply queue the netgraph version to be called when netgraph locking
  273  * allows it to happen.
  274  * Until we know what the rest of the networking code is doing for
  275  * locking, we don't know how we will interact with it.
  276  * Take comfort from the fact that the ifnet struct is part of our
  277  * private info and can't go away while we are queued.
  278  * [Though we don't know it is still there now....]
  279  * it is possible we don't gain anything from this because
  280  * we would like to get the mbuf and queue it as data
  281  * somehow, but we can't and if we did would we solve anything?
  282  */
  283 static void
  284 ng_eiface_start(struct ifnet *ifp)
  285 {
  286         const priv_p priv = (priv_p)ifp->if_softc;
  287 
  288         /* Don't do anything if output is active */
  289         if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
  290                 return;
  291 
  292         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
  293 
  294         if (ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0) != 0)
  295                 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  296 }
  297 
  298 #ifdef DEBUG
  299 /*
  300  * Display an ioctl to the virtual interface
  301  */
  302 
  303 static void
  304 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
  305 {
  306         char *str;
  307 
  308         switch (command & IOC_DIRMASK) {
  309         case IOC_VOID:
  310                 str = "IO";
  311                 break;
  312         case IOC_OUT:
  313                 str = "IOR";
  314                 break;
  315         case IOC_IN:
  316                 str = "IOW";
  317                 break;
  318         case IOC_INOUT:
  319                 str = "IORW";
  320                 break;
  321         default:
  322                 str = "IO??";
  323         }
  324         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
  325             ifp->if_xname,
  326             str,
  327             IOCGROUP(command),
  328             command & 0xff,
  329             IOCPARM_LEN(command));
  330 }
  331 #endif /* DEBUG */
  332 
  333 /*
  334  * ifmedia stuff
  335  */
  336 static int
  337 ng_eiface_mediachange(struct ifnet *ifp)
  338 {
  339         const priv_p priv = (priv_p)ifp->if_softc;
  340         struct ifmedia *ifm = &priv->media;
  341 
  342         if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
  343                 return (EINVAL);
  344         if (IFM_SUBTYPE(ifm->ifm_media) == IFM_AUTO)
  345                 ifp->if_baudrate = ifmedia_baudrate(IFM_ETHER | IFM_1000_T);
  346         else
  347                 ifp->if_baudrate = ifmedia_baudrate(ifm->ifm_media);
  348 
  349         return (0);
  350 }
  351 
  352 static void
  353 ng_eiface_mediastatus(struct ifnet *ifp, struct ifmediareq *ifmr)
  354 {
  355         const priv_p priv = (priv_p)ifp->if_softc;
  356         struct ifmedia *ifm = &priv->media;
  357 
  358         if (ifm->ifm_cur->ifm_media == (IFM_ETHER | IFM_AUTO) &&
  359             (priv->link_status & IFM_ACTIVE))
  360                 ifmr->ifm_active = IFM_ETHER | IFM_1000_T | IFM_FDX;
  361         else
  362                 ifmr->ifm_active = ifm->ifm_cur->ifm_media;
  363         ifmr->ifm_status = priv->link_status;
  364 
  365         return;
  366 }
  367 
  368 /************************************************************************
  369                         NETGRAPH NODE STUFF
  370  ************************************************************************/
  371 
  372 /*
  373  * Constructor for a node
  374  */
  375 static int
  376 ng_eiface_constructor(node_p node)
  377 {
  378         struct ifnet *ifp;
  379         priv_p priv;
  380         u_char eaddr[6] = {0,0,0,0,0,0};
  381 
  382         /* Allocate node and interface private structures */
  383         priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
  384 
  385         ifp = priv->ifp = if_alloc(IFT_ETHER);
  386         if (ifp == NULL) {
  387                 free(priv, M_NETGRAPH);
  388                 return (ENOSPC);
  389         }
  390 
  391         /* Link them together */
  392         ifp->if_softc = priv;
  393 
  394         /* Get an interface unit number */
  395         priv->unit = alloc_unr(V_ng_eiface_unit);
  396 
  397         /* Link together node and private info */
  398         NG_NODE_SET_PRIVATE(node, priv);
  399         priv->node = node;
  400 
  401         /* Initialize interface structure */
  402         if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
  403         ifp->if_init = ng_eiface_init;
  404         ifp->if_output = ether_output;
  405         ifp->if_start = ng_eiface_start;
  406         ifp->if_ioctl = ng_eiface_ioctl;
  407         ifp->if_snd.ifq_maxlen = ifqmaxlen;
  408         ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
  409         ifp->if_capabilities = IFCAP_VLAN_MTU | IFCAP_JUMBO_MTU;
  410         ifp->if_capenable = IFCAP_VLAN_MTU | IFCAP_JUMBO_MTU;
  411         ifmedia_init(&priv->media, 0, ng_eiface_mediachange,
  412             ng_eiface_mediastatus);
  413         ifmedia_add(&priv->media, IFM_ETHER | IFM_10_T, 0, NULL);
  414         ifmedia_add(&priv->media, IFM_ETHER | IFM_10_T | IFM_FDX, 0, NULL);
  415         ifmedia_add(&priv->media, IFM_ETHER | IFM_100_TX, 0, NULL);
  416         ifmedia_add(&priv->media, IFM_ETHER | IFM_100_TX | IFM_FDX, 0, NULL);
  417         ifmedia_add(&priv->media, IFM_ETHER | IFM_1000_T, 0, NULL);
  418         ifmedia_add(&priv->media, IFM_ETHER | IFM_1000_T | IFM_FDX, 0, NULL);
  419         ifmedia_add(&priv->media, IFM_ETHER | IFM_10G_T | IFM_FDX, 0, NULL);
  420         ifmedia_add(&priv->media, IFM_ETHER | IFM_AUTO, 0, NULL);
  421         ifmedia_set(&priv->media, IFM_ETHER | IFM_AUTO);
  422         priv->link_status = IFM_AVALID;
  423 
  424         /* Give this node the same name as the interface (if possible) */
  425         if (ng_name_node(node, ifp->if_xname) != 0)
  426                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
  427                     ifp->if_xname);
  428 
  429         /* Attach the interface */
  430         ether_ifattach(ifp, eaddr);
  431         ifp->if_baudrate = ifmedia_baudrate(IFM_ETHER | IFM_1000_T);
  432 
  433         /* Done */
  434         return (0);
  435 }
  436 
  437 /*
  438  * Give our ok for a hook to be added
  439  */
  440 static int
  441 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
  442 {
  443         priv_p priv = NG_NODE_PRIVATE(node);
  444         struct ifnet *ifp = priv->ifp;
  445 
  446         if (strcmp(name, NG_EIFACE_HOOK_ETHER))
  447                 return (EPFNOSUPPORT);
  448         if (priv->ether != NULL)
  449                 return (EISCONN);
  450         priv->ether = hook;
  451         NG_HOOK_SET_PRIVATE(hook, &priv->ether);
  452         NG_HOOK_SET_TO_INBOUND(hook);
  453 
  454         priv->link_status |= IFM_ACTIVE;
  455         CURVNET_SET_QUIET(ifp->if_vnet);
  456         if_link_state_change(ifp, LINK_STATE_UP);
  457         CURVNET_RESTORE();
  458 
  459         return (0);
  460 }
  461 
  462 /*
  463  * Receive a control message
  464  */
  465 static int
  466 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
  467 {
  468         const priv_p priv = NG_NODE_PRIVATE(node);
  469         struct ifnet *const ifp = priv->ifp;
  470         struct ng_mesg *resp = NULL;
  471         int error = 0;
  472         struct ng_mesg *msg;
  473 
  474         NGI_GET_MSG(item, msg);
  475         switch (msg->header.typecookie) {
  476         case NGM_EIFACE_COOKIE:
  477                 switch (msg->header.cmd) {
  478 
  479                 case NGM_EIFACE_SET:
  480                     {
  481                         if (msg->header.arglen != ETHER_ADDR_LEN) {
  482                                 error = EINVAL;
  483                                 break;
  484                         }
  485                         error = if_setlladdr(priv->ifp,
  486                             (u_char *)msg->data, ETHER_ADDR_LEN);
  487                         EVENTHANDLER_INVOKE(iflladdr_event, priv->ifp);
  488                         break;
  489                     }
  490 
  491                 case NGM_EIFACE_GET_IFNAME:
  492                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
  493                         if (resp == NULL) {
  494                                 error = ENOMEM;
  495                                 break;
  496                         }
  497                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
  498                         break;
  499 
  500                 case NGM_EIFACE_GET_IFADDRS:
  501                     {
  502                         struct ifaddr *ifa;
  503                         caddr_t ptr;
  504                         int buflen;
  505 
  506                         /* Determine size of response and allocate it */
  507                         buflen = 0;
  508                         if_addr_rlock(ifp);
  509                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
  510                                 buflen += SA_SIZE(ifa->ifa_addr);
  511                         NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
  512                         if (resp == NULL) {
  513                                 if_addr_runlock(ifp);
  514                                 error = ENOMEM;
  515                                 break;
  516                         }
  517 
  518                         /* Add addresses */
  519                         ptr = resp->data;
  520                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  521                                 const int len = SA_SIZE(ifa->ifa_addr);
  522 
  523                                 if (buflen < len) {
  524                                         log(LOG_ERR, "%s: len changed?\n",
  525                                             ifp->if_xname);
  526                                         break;
  527                                 }
  528                                 bcopy(ifa->ifa_addr, ptr, len);
  529                                 ptr += len;
  530                                 buflen -= len;
  531                         }
  532                         if_addr_runlock(ifp);
  533                         break;
  534                     }
  535 
  536                 default:
  537                         error = EINVAL;
  538                         break;
  539                 } /* end of inner switch() */
  540                 break;
  541         case NGM_FLOW_COOKIE:
  542                 CURVNET_SET_QUIET(ifp->if_vnet);
  543                 switch (msg->header.cmd) {
  544                 case NGM_LINK_IS_UP:
  545                         priv->link_status |= IFM_ACTIVE;
  546                         if_link_state_change(ifp, LINK_STATE_UP);
  547                         break;
  548                 case NGM_LINK_IS_DOWN:
  549                         priv->link_status &= ~IFM_ACTIVE;
  550                         if_link_state_change(ifp, LINK_STATE_DOWN);
  551                         break;
  552                 default:
  553                         break;
  554                 }
  555                 CURVNET_RESTORE();
  556                 break;
  557         default:
  558                 error = EINVAL;
  559                 break;
  560         }
  561         NG_RESPOND_MSG(error, node, item, resp);
  562         NG_FREE_MSG(msg);
  563         return (error);
  564 }
  565 
  566 /*
  567  * Receive data from a hook. Pass the packet to the ether_input routine.
  568  */
  569 static int
  570 ng_eiface_rcvdata(hook_p hook, item_p item)
  571 {
  572         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  573         struct ifnet *const ifp = priv->ifp;
  574         struct mbuf *m;
  575 
  576         NGI_GET_M(item, m);
  577         NG_FREE_ITEM(item);
  578 
  579         if (!((ifp->if_flags & IFF_UP) &&
  580             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
  581                 NG_FREE_M(m);
  582                 return (ENETDOWN);
  583         }
  584 
  585         if (m->m_len < ETHER_HDR_LEN) {
  586                 m = m_pullup(m, ETHER_HDR_LEN);
  587                 if (m == NULL)
  588                         return (EINVAL);
  589         }
  590 
  591         /* Note receiving interface */
  592         m->m_pkthdr.rcvif = ifp;
  593 
  594         /* Update interface stats */
  595         ifp->if_ipackets++;
  596 
  597         (*ifp->if_input)(ifp, m);
  598 
  599         /* Done */
  600         return (0);
  601 }
  602 
  603 /*
  604  * Shutdown processing.
  605  */
  606 static int
  607 ng_eiface_rmnode(node_p node)
  608 {
  609         const priv_p priv = NG_NODE_PRIVATE(node);
  610         struct ifnet *const ifp = priv->ifp;
  611 
  612         /*
  613          * the ifnet may be in a different vnet than the netgraph node, 
  614          * hence we have to change the current vnet context here.
  615          */
  616         CURVNET_SET_QUIET(ifp->if_vnet);
  617         ifmedia_removeall(&priv->media);
  618         ether_ifdetach(ifp);
  619         if_free(ifp);
  620         CURVNET_RESTORE();
  621         free_unr(V_ng_eiface_unit, priv->unit);
  622         free(priv, M_NETGRAPH);
  623         NG_NODE_SET_PRIVATE(node, NULL);
  624         NG_NODE_UNREF(node);
  625         return (0);
  626 }
  627 
  628 /*
  629  * Hook disconnection
  630  */
  631 static int
  632 ng_eiface_disconnect(hook_p hook)
  633 {
  634         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  635 
  636         priv->ether = NULL;
  637         priv->link_status &= ~IFM_ACTIVE;
  638         CURVNET_SET_QUIET(priv->ifp->if_vnet);
  639         if_link_state_change(priv->ifp, LINK_STATE_DOWN);
  640         CURVNET_RESTORE();
  641         return (0);
  642 }
  643 
  644 /*
  645  * Handle loading and unloading for this node type.
  646  */
  647 static int
  648 ng_eiface_mod_event(module_t mod, int event, void *data)
  649 {
  650         int error = 0;
  651 
  652         switch (event) {
  653         case MOD_LOAD:
  654         case MOD_UNLOAD:
  655                 break;
  656         default:
  657                 error = EOPNOTSUPP;
  658                 break;
  659         }
  660         return (error);
  661 }
  662 
  663 static void
  664 vnet_ng_eiface_init(const void *unused)
  665 {
  666 
  667         V_ng_eiface_unit = new_unrhdr(0, 0xffff, NULL);
  668 }
  669 VNET_SYSINIT(vnet_ng_eiface_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
  670     vnet_ng_eiface_init, NULL);
  671 
  672 static void
  673 vnet_ng_eiface_uninit(const void *unused)
  674 {
  675 
  676         delete_unrhdr(V_ng_eiface_unit);
  677 }
  678 VNET_SYSUNINIT(vnet_ng_eiface_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
  679    vnet_ng_eiface_uninit, NULL);

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