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/11.1/sys/netgraph/ng_eiface.c 302054 2016-06-21 13:48:49Z bz $
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/eventhandler.h>
   33 #include <sys/systm.h>
   34 #include <sys/errno.h>
   35 #include <sys/kernel.h>
   36 #include <sys/malloc.h>
   37 #include <sys/mbuf.h>
   38 #include <sys/errno.h>
   39 #include <sys/proc.h>
   40 #include <sys/sockio.h>
   41 #include <sys/socket.h>
   42 #include <sys/syslog.h>
   43 
   44 #include <net/if.h>
   45 #include <net/if_var.h>
   46 #include <net/if_media.h>
   47 #include <net/if_types.h>
   48 #include <net/netisr.h>
   49 #include <net/route.h>
   50 #include <net/vnet.h>
   51 
   52 #include <netgraph/ng_message.h>
   53 #include <netgraph/netgraph.h>
   54 #include <netgraph/ng_parse.h>
   55 #include <netgraph/ng_eiface.h>
   56 
   57 #include <net/bpf.h>
   58 #include <net/ethernet.h>
   59 #include <net/if_arp.h>
   60 
   61 static const struct ng_cmdlist ng_eiface_cmdlist[] = {
   62         {
   63           NGM_EIFACE_COOKIE,
   64           NGM_EIFACE_GET_IFNAME,
   65           "getifname",
   66           NULL,
   67           &ng_parse_string_type
   68         },
   69         {
   70           NGM_EIFACE_COOKIE,
   71           NGM_EIFACE_SET,
   72           "set",
   73           &ng_parse_enaddr_type,
   74           NULL
   75         },
   76         { 0 }
   77 };
   78 
   79 /* Node private data */
   80 struct ng_eiface_private {
   81         struct ifnet    *ifp;           /* per-interface network data */
   82         struct ifmedia  media;          /* (fake) media information */
   83         int             link_status;    /* fake */
   84         int             unit;           /* Interface unit number */
   85         node_p          node;           /* Our netgraph node */
   86         hook_p          ether;          /* Hook for ethernet stream */
   87 };
   88 typedef struct ng_eiface_private *priv_p;
   89 
   90 /* Interface methods */
   91 static void     ng_eiface_init(void *xsc);
   92 static void     ng_eiface_start(struct ifnet *ifp);
   93 static int      ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
   94 #ifdef DEBUG
   95 static void     ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
   96 #endif
   97 
   98 /* Netgraph methods */
   99 static int              ng_eiface_mod_event(module_t, int, void *);
  100 static ng_constructor_t ng_eiface_constructor;
  101 static ng_rcvmsg_t      ng_eiface_rcvmsg;
  102 static ng_shutdown_t    ng_eiface_rmnode;
  103 static ng_newhook_t     ng_eiface_newhook;
  104 static ng_rcvdata_t     ng_eiface_rcvdata;
  105 static ng_disconnect_t  ng_eiface_disconnect;
  106 
  107 /* Node type descriptor */
  108 static struct ng_type typestruct = {
  109         .version =      NG_ABI_VERSION,
  110         .name =         NG_EIFACE_NODE_TYPE,
  111         .mod_event =    ng_eiface_mod_event,
  112         .constructor =  ng_eiface_constructor,
  113         .rcvmsg =       ng_eiface_rcvmsg,
  114         .shutdown =     ng_eiface_rmnode,
  115         .newhook =      ng_eiface_newhook,
  116         .rcvdata =      ng_eiface_rcvdata,
  117         .disconnect =   ng_eiface_disconnect,
  118         .cmdlist =      ng_eiface_cmdlist
  119 };
  120 NETGRAPH_INIT(eiface, &typestruct);
  121 
  122 static VNET_DEFINE(struct unrhdr *, ng_eiface_unit);
  123 #define V_ng_eiface_unit                VNET(ng_eiface_unit)
  124 
  125 /************************************************************************
  126                         INTERFACE STUFF
  127  ************************************************************************/
  128 
  129 /*
  130  * Process an ioctl for the virtual interface
  131  */
  132 static int
  133 ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
  134 {
  135         const priv_p priv = (priv_p)ifp->if_softc;
  136         struct ifreq *const ifr = (struct ifreq *)data;
  137         int error = 0;
  138 
  139 #ifdef DEBUG
  140         ng_eiface_print_ioctl(ifp, command, data);
  141 #endif
  142         switch (command) {
  143 
  144         /* These two are mostly handled at a higher layer */
  145         case SIOCSIFADDR:
  146                 error = ether_ioctl(ifp, command, data);
  147                 break;
  148         case SIOCGIFADDR:
  149                 break;
  150 
  151         /* Set flags */
  152         case SIOCSIFFLAGS:
  153                 /*
  154                  * If the interface is marked up and stopped, then start it.
  155                  * If it is marked down and running, then stop it.
  156                  */
  157                 if (ifp->if_flags & IFF_UP) {
  158                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  159                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  160                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  161                         }
  162                 } else {
  163                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
  164                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
  165                                     IFF_DRV_OACTIVE);
  166                 }
  167                 break;
  168 
  169         /* Set the interface MTU */
  170         case SIOCSIFMTU:
  171                 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX ||
  172                     ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
  173                         error = EINVAL;
  174                 else
  175                         ifp->if_mtu = ifr->ifr_mtu;
  176                 break;
  177 
  178         /* (Fake) media type manipulation */
  179         case SIOCSIFMEDIA:
  180         case SIOCGIFMEDIA:
  181                 error = ifmedia_ioctl(ifp, ifr, &priv->media, command);
  182                 break;
  183 
  184         /* Stuff that's not supported */
  185         case SIOCADDMULTI:
  186         case SIOCDELMULTI:
  187                 error = 0;
  188                 break;
  189         case SIOCSIFPHYS:
  190                 error = EOPNOTSUPP;
  191                 break;
  192 
  193         default:
  194                 error = EINVAL;
  195                 break;
  196         }
  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 
  206         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  207         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  208 }
  209 
  210 /*
  211  * We simply relay the packet to the "ether" hook, if it is connected.
  212  * We have been through the netgraph locking and are guaranteed to
  213  * be the only code running in this node at this time.
  214  */
  215 static void
  216 ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
  217 {
  218         struct ifnet *ifp = arg1;
  219         const priv_p priv = (priv_p)ifp->if_softc;
  220         int error = 0;
  221         struct mbuf *m;
  222 
  223         /* Check interface flags */
  224 
  225         if (!((ifp->if_flags & IFF_UP) &&
  226             (ifp->if_drv_flags & IFF_DRV_RUNNING)))
  227                 return;
  228 
  229         for (;;) {
  230                 /*
  231                  * Grab a packet to transmit.
  232                  */
  233                 IF_DEQUEUE(&ifp->if_snd, m);
  234 
  235                 /* If there's nothing to send, break. */
  236                 if (m == NULL)
  237                         break;
  238 
  239                 /* Peel the mbuf off any stale tags */
  240                 m_tag_delete_chain(m, NULL);
  241 
  242                 /*
  243                  * Berkeley packet filter.
  244                  * Pass packet to bpf if there is a listener.
  245                  * XXX is this safe? locking?
  246                  */
  247                 BPF_MTAP(ifp, m);
  248 
  249                 if (ifp->if_flags & IFF_MONITOR) {
  250                         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
  251                         m_freem(m);
  252                         continue;
  253                 }
  254 
  255                 /*
  256                  * Send packet; if hook is not connected, mbuf will get
  257                  * freed.
  258                  */
  259                 NG_OUTBOUND_THREAD_REF();
  260                 NG_SEND_DATA_ONLY(error, priv->ether, m);
  261                 NG_OUTBOUND_THREAD_UNREF();
  262 
  263                 /* Update stats */
  264                 if (error == 0)
  265                         if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
  266                 else
  267                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  268         }
  269 
  270         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  271 
  272         return;
  273 }
  274 
  275 /*
  276  * This routine is called to deliver a packet out the interface.
  277  * We simply queue the netgraph version to be called when netgraph locking
  278  * allows it to happen.
  279  * Until we know what the rest of the networking code is doing for
  280  * locking, we don't know how we will interact with it.
  281  * Take comfort from the fact that the ifnet struct is part of our
  282  * private info and can't go away while we are queued.
  283  * [Though we don't know it is still there now....]
  284  * it is possible we don't gain anything from this because
  285  * we would like to get the mbuf and queue it as data
  286  * somehow, but we can't and if we did would we solve anything?
  287  */
  288 static void
  289 ng_eiface_start(struct ifnet *ifp)
  290 {
  291         const priv_p priv = (priv_p)ifp->if_softc;
  292 
  293         /* Don't do anything if output is active */
  294         if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
  295                 return;
  296 
  297         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
  298 
  299         if (ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0) != 0)
  300                 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  301 }
  302 
  303 #ifdef DEBUG
  304 /*
  305  * Display an ioctl to the virtual interface
  306  */
  307 
  308 static void
  309 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
  310 {
  311         char *str;
  312 
  313         switch (command & IOC_DIRMASK) {
  314         case IOC_VOID:
  315                 str = "IO";
  316                 break;
  317         case IOC_OUT:
  318                 str = "IOR";
  319                 break;
  320         case IOC_IN:
  321                 str = "IOW";
  322                 break;
  323         case IOC_INOUT:
  324                 str = "IORW";
  325                 break;
  326         default:
  327                 str = "IO??";
  328         }
  329         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
  330             ifp->if_xname,
  331             str,
  332             IOCGROUP(command),
  333             command & 0xff,
  334             IOCPARM_LEN(command));
  335 }
  336 #endif /* DEBUG */
  337 
  338 /*
  339  * ifmedia stuff
  340  */
  341 static int
  342 ng_eiface_mediachange(struct ifnet *ifp)
  343 {
  344         const priv_p priv = (priv_p)ifp->if_softc;
  345         struct ifmedia *ifm = &priv->media;
  346 
  347         if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
  348                 return (EINVAL);
  349         if (IFM_SUBTYPE(ifm->ifm_media) == IFM_AUTO)
  350                 ifp->if_baudrate = ifmedia_baudrate(IFM_ETHER | IFM_1000_T);
  351         else
  352                 ifp->if_baudrate = ifmedia_baudrate(ifm->ifm_media);
  353 
  354         return (0);
  355 }
  356 
  357 static void
  358 ng_eiface_mediastatus(struct ifnet *ifp, struct ifmediareq *ifmr)
  359 {
  360         const priv_p priv = (priv_p)ifp->if_softc;
  361         struct ifmedia *ifm = &priv->media;
  362 
  363         if (ifm->ifm_cur->ifm_media == (IFM_ETHER | IFM_AUTO) &&
  364             (priv->link_status & IFM_ACTIVE))
  365                 ifmr->ifm_active = IFM_ETHER | IFM_1000_T | IFM_FDX;
  366         else
  367                 ifmr->ifm_active = ifm->ifm_cur->ifm_media;
  368         ifmr->ifm_status = priv->link_status;
  369 
  370         return;
  371 }
  372 
  373 /************************************************************************
  374                         NETGRAPH NODE STUFF
  375  ************************************************************************/
  376 
  377 /*
  378  * Constructor for a node
  379  */
  380 static int
  381 ng_eiface_constructor(node_p node)
  382 {
  383         struct ifnet *ifp;
  384         priv_p priv;
  385         u_char eaddr[6] = {0,0,0,0,0,0};
  386 
  387         /* Allocate node and interface private structures */
  388         priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
  389 
  390         ifp = priv->ifp = if_alloc(IFT_ETHER);
  391         if (ifp == NULL) {
  392                 free(priv, M_NETGRAPH);
  393                 return (ENOSPC);
  394         }
  395 
  396         /* Link them together */
  397         ifp->if_softc = priv;
  398 
  399         /* Get an interface unit number */
  400         priv->unit = alloc_unr(V_ng_eiface_unit);
  401 
  402         /* Link together node and private info */
  403         NG_NODE_SET_PRIVATE(node, priv);
  404         priv->node = node;
  405 
  406         /* Initialize interface structure */
  407         if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
  408         ifp->if_init = ng_eiface_init;
  409         ifp->if_output = ether_output;
  410         ifp->if_start = ng_eiface_start;
  411         ifp->if_ioctl = ng_eiface_ioctl;
  412         ifp->if_snd.ifq_maxlen = ifqmaxlen;
  413         ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
  414         ifp->if_capabilities = IFCAP_VLAN_MTU | IFCAP_JUMBO_MTU;
  415         ifp->if_capenable = IFCAP_VLAN_MTU | IFCAP_JUMBO_MTU;
  416         ifmedia_init(&priv->media, 0, ng_eiface_mediachange,
  417             ng_eiface_mediastatus);
  418         ifmedia_add(&priv->media, IFM_ETHER | IFM_10_T, 0, NULL);
  419         ifmedia_add(&priv->media, IFM_ETHER | IFM_10_T | IFM_FDX, 0, NULL);
  420         ifmedia_add(&priv->media, IFM_ETHER | IFM_100_TX, 0, NULL);
  421         ifmedia_add(&priv->media, IFM_ETHER | IFM_100_TX | IFM_FDX, 0, NULL);
  422         ifmedia_add(&priv->media, IFM_ETHER | IFM_1000_T, 0, NULL);
  423         ifmedia_add(&priv->media, IFM_ETHER | IFM_1000_T | IFM_FDX, 0, NULL);
  424         ifmedia_add(&priv->media, IFM_ETHER | IFM_10G_T | IFM_FDX, 0, NULL);
  425         ifmedia_add(&priv->media, IFM_ETHER | IFM_AUTO, 0, NULL);
  426         ifmedia_set(&priv->media, IFM_ETHER | IFM_AUTO);
  427         priv->link_status = IFM_AVALID;
  428 
  429         /* Give this node the same name as the interface (if possible) */
  430         if (ng_name_node(node, ifp->if_xname) != 0)
  431                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
  432                     ifp->if_xname);
  433 
  434         /* Attach the interface */
  435         ether_ifattach(ifp, eaddr);
  436         ifp->if_baudrate = ifmedia_baudrate(IFM_ETHER | IFM_1000_T);
  437 
  438         /* Done */
  439         return (0);
  440 }
  441 
  442 /*
  443  * Give our ok for a hook to be added
  444  */
  445 static int
  446 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
  447 {
  448         priv_p priv = NG_NODE_PRIVATE(node);
  449         struct ifnet *ifp = priv->ifp;
  450 
  451         if (strcmp(name, NG_EIFACE_HOOK_ETHER))
  452                 return (EPFNOSUPPORT);
  453         if (priv->ether != NULL)
  454                 return (EISCONN);
  455         priv->ether = hook;
  456         NG_HOOK_SET_PRIVATE(hook, &priv->ether);
  457         NG_HOOK_SET_TO_INBOUND(hook);
  458 
  459         priv->link_status |= IFM_ACTIVE;
  460         CURVNET_SET_QUIET(ifp->if_vnet);
  461         if_link_state_change(ifp, LINK_STATE_UP);
  462         CURVNET_RESTORE();
  463 
  464         return (0);
  465 }
  466 
  467 /*
  468  * Receive a control message
  469  */
  470 static int
  471 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
  472 {
  473         const priv_p priv = NG_NODE_PRIVATE(node);
  474         struct ifnet *const ifp = priv->ifp;
  475         struct ng_mesg *resp = NULL;
  476         int error = 0;
  477         struct ng_mesg *msg;
  478 
  479         NGI_GET_MSG(item, msg);
  480         switch (msg->header.typecookie) {
  481         case NGM_EIFACE_COOKIE:
  482                 switch (msg->header.cmd) {
  483 
  484                 case NGM_EIFACE_SET:
  485                     {
  486                         if (msg->header.arglen != ETHER_ADDR_LEN) {
  487                                 error = EINVAL;
  488                                 break;
  489                         }
  490                         error = if_setlladdr(priv->ifp,
  491                             (u_char *)msg->data, ETHER_ADDR_LEN);
  492                         break;
  493                     }
  494 
  495                 case NGM_EIFACE_GET_IFNAME:
  496                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
  497                         if (resp == NULL) {
  498                                 error = ENOMEM;
  499                                 break;
  500                         }
  501                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
  502                         break;
  503 
  504                 case NGM_EIFACE_GET_IFADDRS:
  505                     {
  506                         struct ifaddr *ifa;
  507                         caddr_t ptr;
  508                         int buflen;
  509 
  510                         /* Determine size of response and allocate it */
  511                         buflen = 0;
  512                         if_addr_rlock(ifp);
  513                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
  514                                 buflen += SA_SIZE(ifa->ifa_addr);
  515                         NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
  516                         if (resp == NULL) {
  517                                 if_addr_runlock(ifp);
  518                                 error = ENOMEM;
  519                                 break;
  520                         }
  521 
  522                         /* Add addresses */
  523                         ptr = resp->data;
  524                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  525                                 const int len = SA_SIZE(ifa->ifa_addr);
  526 
  527                                 if (buflen < len) {
  528                                         log(LOG_ERR, "%s: len changed?\n",
  529                                             ifp->if_xname);
  530                                         break;
  531                                 }
  532                                 bcopy(ifa->ifa_addr, ptr, len);
  533                                 ptr += len;
  534                                 buflen -= len;
  535                         }
  536                         if_addr_runlock(ifp);
  537                         break;
  538                     }
  539 
  540                 default:
  541                         error = EINVAL;
  542                         break;
  543                 } /* end of inner switch() */
  544                 break;
  545         case NGM_FLOW_COOKIE:
  546                 CURVNET_SET_QUIET(ifp->if_vnet);
  547                 switch (msg->header.cmd) {
  548                 case NGM_LINK_IS_UP:
  549                         priv->link_status |= IFM_ACTIVE;
  550                         if_link_state_change(ifp, LINK_STATE_UP);
  551                         break;
  552                 case NGM_LINK_IS_DOWN:
  553                         priv->link_status &= ~IFM_ACTIVE;
  554                         if_link_state_change(ifp, LINK_STATE_DOWN);
  555                         break;
  556                 default:
  557                         break;
  558                 }
  559                 CURVNET_RESTORE();
  560                 break;
  561         default:
  562                 error = EINVAL;
  563                 break;
  564         }
  565         NG_RESPOND_MSG(error, node, item, resp);
  566         NG_FREE_MSG(msg);
  567         return (error);
  568 }
  569 
  570 /*
  571  * Receive data from a hook. Pass the packet to the ether_input routine.
  572  */
  573 static int
  574 ng_eiface_rcvdata(hook_p hook, item_p item)
  575 {
  576         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  577         struct ifnet *const ifp = priv->ifp;
  578         struct mbuf *m;
  579 
  580         NGI_GET_M(item, m);
  581         NG_FREE_ITEM(item);
  582 
  583         if (!((ifp->if_flags & IFF_UP) &&
  584             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
  585                 NG_FREE_M(m);
  586                 return (ENETDOWN);
  587         }
  588 
  589         if (m->m_len < ETHER_HDR_LEN) {
  590                 m = m_pullup(m, ETHER_HDR_LEN);
  591                 if (m == NULL)
  592                         return (EINVAL);
  593         }
  594 
  595         /* Note receiving interface */
  596         m->m_pkthdr.rcvif = ifp;
  597 
  598         /* Update interface stats */
  599         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
  600 
  601         (*ifp->if_input)(ifp, m);
  602 
  603         /* Done */
  604         return (0);
  605 }
  606 
  607 /*
  608  * Shutdown processing.
  609  */
  610 static int
  611 ng_eiface_rmnode(node_p node)
  612 {
  613         const priv_p priv = NG_NODE_PRIVATE(node);
  614         struct ifnet *const ifp = priv->ifp;
  615 
  616         /*
  617          * the ifnet may be in a different vnet than the netgraph node, 
  618          * hence we have to change the current vnet context here.
  619          */
  620         CURVNET_SET_QUIET(ifp->if_vnet);
  621         ifmedia_removeall(&priv->media);
  622         ether_ifdetach(ifp);
  623         if_free(ifp);
  624         CURVNET_RESTORE();
  625         free_unr(V_ng_eiface_unit, priv->unit);
  626         free(priv, M_NETGRAPH);
  627         NG_NODE_SET_PRIVATE(node, NULL);
  628         NG_NODE_UNREF(node);
  629         return (0);
  630 }
  631 
  632 /*
  633  * Hook disconnection
  634  */
  635 static int
  636 ng_eiface_disconnect(hook_p hook)
  637 {
  638         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  639 
  640         priv->ether = NULL;
  641         priv->link_status &= ~IFM_ACTIVE;
  642         CURVNET_SET_QUIET(priv->ifp->if_vnet);
  643         if_link_state_change(priv->ifp, LINK_STATE_DOWN);
  644         CURVNET_RESTORE();
  645         return (0);
  646 }
  647 
  648 /*
  649  * Handle loading and unloading for this node type.
  650  */
  651 static int
  652 ng_eiface_mod_event(module_t mod, int event, void *data)
  653 {
  654         int error = 0;
  655 
  656         switch (event) {
  657         case MOD_LOAD:
  658         case MOD_UNLOAD:
  659                 break;
  660         default:
  661                 error = EOPNOTSUPP;
  662                 break;
  663         }
  664         return (error);
  665 }
  666 
  667 static void
  668 vnet_ng_eiface_init(const void *unused)
  669 {
  670 
  671         V_ng_eiface_unit = new_unrhdr(0, 0xffff, NULL);
  672 }
  673 VNET_SYSINIT(vnet_ng_eiface_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
  674     vnet_ng_eiface_init, NULL);
  675 
  676 static void
  677 vnet_ng_eiface_uninit(const void *unused)
  678 {
  679 
  680         delete_unrhdr(V_ng_eiface_unit);
  681 }
  682 VNET_SYSUNINIT(vnet_ng_eiface_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
  683    vnet_ng_eiface_uninit, NULL);

Cache object: 05f00bba9aee280a4e8f2007fcb6d32d


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