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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  *
    5  * Copyright (c) 1999-2001, Vitaly V Belekhov
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice unmodified, this list of conditions, and the following
   13  *    disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  * $FreeBSD: releng/12.0/sys/netgraph/ng_eiface.c 336676 2018-07-24 16:35:52Z andrew $
   31  */
   32 
   33 #include <sys/param.h>
   34 #include <sys/eventhandler.h>
   35 #include <sys/systm.h>
   36 #include <sys/errno.h>
   37 #include <sys/kernel.h>
   38 #include <sys/malloc.h>
   39 #include <sys/mbuf.h>
   40 #include <sys/errno.h>
   41 #include <sys/proc.h>
   42 #include <sys/sockio.h>
   43 #include <sys/socket.h>
   44 #include <sys/syslog.h>
   45 
   46 #include <net/if.h>
   47 #include <net/if_var.h>
   48 #include <net/if_media.h>
   49 #include <net/if_types.h>
   50 #include <net/netisr.h>
   51 #include <net/route.h>
   52 #include <net/vnet.h>
   53 
   54 #include <netgraph/ng_message.h>
   55 #include <netgraph/netgraph.h>
   56 #include <netgraph/ng_parse.h>
   57 #include <netgraph/ng_eiface.h>
   58 
   59 #include <net/bpf.h>
   60 #include <net/ethernet.h>
   61 #include <net/if_arp.h>
   62 
   63 
   64 static const struct ng_cmdlist ng_eiface_cmdlist[] = {
   65         {
   66           NGM_EIFACE_COOKIE,
   67           NGM_EIFACE_GET_IFNAME,
   68           "getifname",
   69           NULL,
   70           &ng_parse_string_type
   71         },
   72         {
   73           NGM_EIFACE_COOKIE,
   74           NGM_EIFACE_SET,
   75           "set",
   76           &ng_parse_enaddr_type,
   77           NULL
   78         },
   79         { 0 }
   80 };
   81 
   82 /* Node private data */
   83 struct ng_eiface_private {
   84         struct ifnet    *ifp;           /* per-interface network data */
   85         struct ifmedia  media;          /* (fake) media information */
   86         int             link_status;    /* fake */
   87         int             unit;           /* Interface unit number */
   88         node_p          node;           /* Our netgraph node */
   89         hook_p          ether;          /* Hook for ethernet stream */
   90 };
   91 typedef struct ng_eiface_private *priv_p;
   92 
   93 /* Interface methods */
   94 static void     ng_eiface_init(void *xsc);
   95 static void     ng_eiface_start(struct ifnet *ifp);
   96 static int      ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
   97 #ifdef DEBUG
   98 static void     ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
   99 #endif
  100 
  101 /* Netgraph methods */
  102 static int              ng_eiface_mod_event(module_t, int, void *);
  103 static ng_constructor_t ng_eiface_constructor;
  104 static ng_rcvmsg_t      ng_eiface_rcvmsg;
  105 static ng_shutdown_t    ng_eiface_rmnode;
  106 static ng_newhook_t     ng_eiface_newhook;
  107 static ng_rcvdata_t     ng_eiface_rcvdata;
  108 static ng_disconnect_t  ng_eiface_disconnect;
  109 
  110 /* Node type descriptor */
  111 static struct ng_type typestruct = {
  112         .version =      NG_ABI_VERSION,
  113         .name =         NG_EIFACE_NODE_TYPE,
  114         .mod_event =    ng_eiface_mod_event,
  115         .constructor =  ng_eiface_constructor,
  116         .rcvmsg =       ng_eiface_rcvmsg,
  117         .shutdown =     ng_eiface_rmnode,
  118         .newhook =      ng_eiface_newhook,
  119         .rcvdata =      ng_eiface_rcvdata,
  120         .disconnect =   ng_eiface_disconnect,
  121         .cmdlist =      ng_eiface_cmdlist
  122 };
  123 NETGRAPH_INIT(eiface, &typestruct);
  124 
  125 VNET_DEFINE_STATIC(struct unrhdr *, ng_eiface_unit);
  126 #define V_ng_eiface_unit                VNET(ng_eiface_unit)
  127 
  128 /************************************************************************
  129                         INTERFACE STUFF
  130  ************************************************************************/
  131 
  132 /*
  133  * Process an ioctl for the virtual interface
  134  */
  135 static int
  136 ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
  137 {
  138         const priv_p priv = (priv_p)ifp->if_softc;
  139         struct ifreq *const ifr = (struct ifreq *)data;
  140         int error = 0;
  141 
  142 #ifdef DEBUG
  143         ng_eiface_print_ioctl(ifp, command, data);
  144 #endif
  145         switch (command) {
  146 
  147         /* These two are mostly handled at a higher layer */
  148         case SIOCSIFADDR:
  149                 error = ether_ioctl(ifp, command, data);
  150                 break;
  151         case SIOCGIFADDR:
  152                 break;
  153 
  154         /* Set flags */
  155         case SIOCSIFFLAGS:
  156                 /*
  157                  * If the interface is marked up and stopped, then start it.
  158                  * If it is marked down and running, then stop it.
  159                  */
  160                 if (ifp->if_flags & IFF_UP) {
  161                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  162                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  163                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  164                         }
  165                 } else {
  166                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
  167                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
  168                                     IFF_DRV_OACTIVE);
  169                 }
  170                 break;
  171 
  172         /* Set the interface MTU */
  173         case SIOCSIFMTU:
  174                 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX ||
  175                     ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
  176                         error = EINVAL;
  177                 else
  178                         ifp->if_mtu = ifr->ifr_mtu;
  179                 break;
  180 
  181         /* (Fake) media type manipulation */
  182         case SIOCSIFMEDIA:
  183         case SIOCGIFMEDIA:
  184                 error = ifmedia_ioctl(ifp, ifr, &priv->media, command);
  185                 break;
  186 
  187         /* Stuff that's not supported */
  188         case SIOCADDMULTI:
  189         case SIOCDELMULTI:
  190                 error = 0;
  191                 break;
  192         case SIOCSIFPHYS:
  193                 error = EOPNOTSUPP;
  194                 break;
  195 
  196         default:
  197                 error = EINVAL;
  198                 break;
  199         }
  200         return (error);
  201 }
  202 
  203 static void
  204 ng_eiface_init(void *xsc)
  205 {
  206         priv_p sc = xsc;
  207         struct ifnet *ifp = sc->ifp;
  208 
  209         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  210         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  211 }
  212 
  213 /*
  214  * We simply relay the packet to the "ether" hook, if it is connected.
  215  * We have been through the netgraph locking and are guaranteed to
  216  * be the only code running in this node at this time.
  217  */
  218 static void
  219 ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
  220 {
  221         struct ifnet *ifp = arg1;
  222         const priv_p priv = (priv_p)ifp->if_softc;
  223         int error = 0;
  224         struct mbuf *m;
  225 
  226         /* Check interface flags */
  227 
  228         if (!((ifp->if_flags & IFF_UP) &&
  229             (ifp->if_drv_flags & IFF_DRV_RUNNING)))
  230                 return;
  231 
  232         for (;;) {
  233                 /*
  234                  * Grab a packet to transmit.
  235                  */
  236                 IF_DEQUEUE(&ifp->if_snd, m);
  237 
  238                 /* If there's nothing to send, break. */
  239                 if (m == NULL)
  240                         break;
  241 
  242                 /* Peel the mbuf off any stale tags */
  243                 m_tag_delete_chain(m, NULL);
  244 
  245                 /*
  246                  * Berkeley packet filter.
  247                  * Pass packet to bpf if there is a listener.
  248                  * XXX is this safe? locking?
  249                  */
  250                 BPF_MTAP(ifp, m);
  251 
  252                 if (ifp->if_flags & IFF_MONITOR) {
  253                         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
  254                         m_freem(m);
  255                         continue;
  256                 }
  257 
  258                 /*
  259                  * Send packet; if hook is not connected, mbuf will get
  260                  * freed.
  261                  */
  262                 NG_OUTBOUND_THREAD_REF();
  263                 NG_SEND_DATA_ONLY(error, priv->ether, m);
  264                 NG_OUTBOUND_THREAD_UNREF();
  265 
  266                 /* Update stats */
  267                 if (error == 0)
  268                         if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
  269                 else
  270                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  271         }
  272 
  273         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  274 
  275         return;
  276 }
  277 
  278 /*
  279  * This routine is called to deliver a packet out the interface.
  280  * We simply queue the netgraph version to be called when netgraph locking
  281  * allows it to happen.
  282  * Until we know what the rest of the networking code is doing for
  283  * locking, we don't know how we will interact with it.
  284  * Take comfort from the fact that the ifnet struct is part of our
  285  * private info and can't go away while we are queued.
  286  * [Though we don't know it is still there now....]
  287  * it is possible we don't gain anything from this because
  288  * we would like to get the mbuf and queue it as data
  289  * somehow, but we can't and if we did would we solve anything?
  290  */
  291 static void
  292 ng_eiface_start(struct ifnet *ifp)
  293 {
  294         const priv_p priv = (priv_p)ifp->if_softc;
  295 
  296         /* Don't do anything if output is active */
  297         if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
  298                 return;
  299 
  300         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
  301 
  302         if (ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0) != 0)
  303                 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  304 }
  305 
  306 #ifdef DEBUG
  307 /*
  308  * Display an ioctl to the virtual interface
  309  */
  310 
  311 static void
  312 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
  313 {
  314         char *str;
  315 
  316         switch (command & IOC_DIRMASK) {
  317         case IOC_VOID:
  318                 str = "IO";
  319                 break;
  320         case IOC_OUT:
  321                 str = "IOR";
  322                 break;
  323         case IOC_IN:
  324                 str = "IOW";
  325                 break;
  326         case IOC_INOUT:
  327                 str = "IORW";
  328                 break;
  329         default:
  330                 str = "IO??";
  331         }
  332         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
  333             ifp->if_xname,
  334             str,
  335             IOCGROUP(command),
  336             command & 0xff,
  337             IOCPARM_LEN(command));
  338 }
  339 #endif /* DEBUG */
  340 
  341 /*
  342  * ifmedia stuff
  343  */
  344 static int
  345 ng_eiface_mediachange(struct ifnet *ifp)
  346 {
  347         const priv_p priv = (priv_p)ifp->if_softc;
  348         struct ifmedia *ifm = &priv->media;
  349 
  350         if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
  351                 return (EINVAL);
  352         if (IFM_SUBTYPE(ifm->ifm_media) == IFM_AUTO)
  353                 ifp->if_baudrate = ifmedia_baudrate(IFM_ETHER | IFM_1000_T);
  354         else
  355                 ifp->if_baudrate = ifmedia_baudrate(ifm->ifm_media);
  356 
  357         return (0);
  358 }
  359 
  360 static void
  361 ng_eiface_mediastatus(struct ifnet *ifp, struct ifmediareq *ifmr)
  362 {
  363         const priv_p priv = (priv_p)ifp->if_softc;
  364         struct ifmedia *ifm = &priv->media;
  365 
  366         if (ifm->ifm_cur->ifm_media == (IFM_ETHER | IFM_AUTO) &&
  367             (priv->link_status & IFM_ACTIVE))
  368                 ifmr->ifm_active = IFM_ETHER | IFM_1000_T | IFM_FDX;
  369         else
  370                 ifmr->ifm_active = ifm->ifm_cur->ifm_media;
  371         ifmr->ifm_status = priv->link_status;
  372 
  373         return;
  374 }
  375 
  376 /************************************************************************
  377                         NETGRAPH NODE STUFF
  378  ************************************************************************/
  379 
  380 /*
  381  * Constructor for a node
  382  */
  383 static int
  384 ng_eiface_constructor(node_p node)
  385 {
  386         struct ifnet *ifp;
  387         priv_p priv;
  388         u_char eaddr[6] = {0,0,0,0,0,0};
  389 
  390         /* Allocate node and interface private structures */
  391         priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
  392 
  393         ifp = priv->ifp = if_alloc(IFT_ETHER);
  394         if (ifp == NULL) {
  395                 free(priv, M_NETGRAPH);
  396                 return (ENOSPC);
  397         }
  398 
  399         /* Link them together */
  400         ifp->if_softc = priv;
  401 
  402         /* Get an interface unit number */
  403         priv->unit = alloc_unr(V_ng_eiface_unit);
  404 
  405         /* Link together node and private info */
  406         NG_NODE_SET_PRIVATE(node, priv);
  407         priv->node = node;
  408 
  409         /* Initialize interface structure */
  410         if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
  411         ifp->if_init = ng_eiface_init;
  412         ifp->if_output = ether_output;
  413         ifp->if_start = ng_eiface_start;
  414         ifp->if_ioctl = ng_eiface_ioctl;
  415         ifp->if_snd.ifq_maxlen = ifqmaxlen;
  416         ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
  417         ifp->if_capabilities = IFCAP_VLAN_MTU | IFCAP_JUMBO_MTU;
  418         ifp->if_capenable = IFCAP_VLAN_MTU | IFCAP_JUMBO_MTU;
  419         ifmedia_init(&priv->media, 0, ng_eiface_mediachange,
  420             ng_eiface_mediastatus);
  421         ifmedia_add(&priv->media, IFM_ETHER | IFM_10_T, 0, NULL);
  422         ifmedia_add(&priv->media, IFM_ETHER | IFM_10_T | IFM_FDX, 0, NULL);
  423         ifmedia_add(&priv->media, IFM_ETHER | IFM_100_TX, 0, NULL);
  424         ifmedia_add(&priv->media, IFM_ETHER | IFM_100_TX | IFM_FDX, 0, NULL);
  425         ifmedia_add(&priv->media, IFM_ETHER | IFM_1000_T, 0, NULL);
  426         ifmedia_add(&priv->media, IFM_ETHER | IFM_1000_T | IFM_FDX, 0, NULL);
  427         ifmedia_add(&priv->media, IFM_ETHER | IFM_10G_T | IFM_FDX, 0, NULL);
  428         ifmedia_add(&priv->media, IFM_ETHER | IFM_AUTO, 0, NULL);
  429         ifmedia_set(&priv->media, IFM_ETHER | IFM_AUTO);
  430         priv->link_status = IFM_AVALID;
  431 
  432         /* Give this node the same name as the interface (if possible) */
  433         if (ng_name_node(node, ifp->if_xname) != 0)
  434                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
  435                     ifp->if_xname);
  436 
  437         /* Attach the interface */
  438         ether_ifattach(ifp, eaddr);
  439         ifp->if_baudrate = ifmedia_baudrate(IFM_ETHER | IFM_1000_T);
  440 
  441         /* Done */
  442         return (0);
  443 }
  444 
  445 /*
  446  * Give our ok for a hook to be added
  447  */
  448 static int
  449 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
  450 {
  451         priv_p priv = NG_NODE_PRIVATE(node);
  452         struct ifnet *ifp = priv->ifp;
  453 
  454         if (strcmp(name, NG_EIFACE_HOOK_ETHER))
  455                 return (EPFNOSUPPORT);
  456         if (priv->ether != NULL)
  457                 return (EISCONN);
  458         priv->ether = hook;
  459         NG_HOOK_SET_PRIVATE(hook, &priv->ether);
  460         NG_HOOK_SET_TO_INBOUND(hook);
  461 
  462         priv->link_status |= IFM_ACTIVE;
  463         CURVNET_SET_QUIET(ifp->if_vnet);
  464         if_link_state_change(ifp, LINK_STATE_UP);
  465         CURVNET_RESTORE();
  466 
  467         return (0);
  468 }
  469 
  470 /*
  471  * Receive a control message
  472  */
  473 static int
  474 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
  475 {
  476         const priv_p priv = NG_NODE_PRIVATE(node);
  477         struct ifnet *const ifp = priv->ifp;
  478         struct ng_mesg *resp = NULL;
  479         int error = 0;
  480         struct ng_mesg *msg;
  481 
  482         NGI_GET_MSG(item, msg);
  483         switch (msg->header.typecookie) {
  484         case NGM_EIFACE_COOKIE:
  485                 switch (msg->header.cmd) {
  486 
  487                 case NGM_EIFACE_SET:
  488                     {
  489                         if (msg->header.arglen != ETHER_ADDR_LEN) {
  490                                 error = EINVAL;
  491                                 break;
  492                         }
  493                         error = if_setlladdr(priv->ifp,
  494                             (u_char *)msg->data, ETHER_ADDR_LEN);
  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                         CK_STAILQ_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                         CK_STAILQ_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         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
  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_INIT_IF, SI_ORDER_ANY,
  686    vnet_ng_eiface_uninit, NULL);

Cache object: 49e4963c4392fb84331960fc627d9148


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