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/5.1/sys/netgraph/ng_eiface.c 111119 2003-02-19 05:47:46Z imp $
   29  */
   30 
   31 
   32 #include <sys/param.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/sockio.h>
   40 #include <sys/socket.h>
   41 #include <sys/syslog.h>
   42 
   43 #include <net/if.h>
   44 #include <net/if_dl.h>
   45 #include <net/if_types.h>
   46 #include <net/netisr.h>
   47 
   48 #include <netinet/in.h>
   49 #include <netinet/if_ether.h>
   50 
   51 #include <netgraph/ng_message.h>
   52 #include <netgraph/netgraph.h>
   53 #include <netgraph/ng_parse.h>
   54 #include <netgraph/ng_eiface.h>
   55 
   56 #include <net/bpf.h>
   57 #include <net/ethernet.h>
   58 #include <net/if_arp.h>
   59 
   60 static const struct ng_parse_struct_field ng_eiface_par_fields[]
   61         = NG_EIFACE_PAR_FIELDS;
   62 
   63 static const struct ng_parse_type ng_eiface_par_type = {
   64         &ng_parse_struct_type,
   65         &ng_eiface_par_fields
   66 };
   67 
   68 static const struct ng_cmdlist ng_eiface_cmdlist[] = {
   69         {
   70           NGM_EIFACE_COOKIE,
   71           NGM_EIFACE_SET,
   72           "set",
   73           &ng_eiface_par_type,
   74           NULL
   75         },
   76         { 0 }
   77 };
   78 
   79 
   80 /* Node private data */
   81 struct ng_eiface_private {
   82         struct ifnet   *ifp;    /* This interface */
   83         int     unit;           /* Interface unit number */
   84         struct arpcom   arpcom; /* per-interface network data */
   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 ng_constructor_t ng_eiface_constructor;
  100 static ng_rcvmsg_t ng_eiface_rcvmsg;
  101 static ng_shutdown_t ng_eiface_rmnode;
  102 static ng_newhook_t ng_eiface_newhook;
  103 static ng_rcvdata_t ng_eiface_rcvdata;
  104 static ng_connect_t ng_eiface_connect;
  105 static ng_disconnect_t ng_eiface_disconnect;
  106 
  107 /* Node type descriptor */
  108 static struct ng_type typestruct = {
  109         NG_ABI_VERSION,
  110         NG_EIFACE_NODE_TYPE,
  111         NULL,
  112         ng_eiface_constructor,
  113         ng_eiface_rcvmsg,
  114         ng_eiface_rmnode,
  115         ng_eiface_newhook,
  116         NULL,
  117         ng_eiface_connect,
  118         ng_eiface_rcvdata,
  119         ng_eiface_disconnect,
  120         ng_eiface_cmdlist
  121 };
  122 NETGRAPH_INIT(eiface, &typestruct);
  123 
  124 static char     ng_eiface_ifname[] = NG_EIFACE_EIFACE_NAME;
  125 
  126 /* We keep a bitmap indicating which unit numbers are free.
  127    One means the unit number is free, zero means it's taken. */
  128 static int      *ng_eiface_units = NULL;
  129 static int      ng_eiface_units_len = 0;
  130 static int      ng_units_in_use = 0;
  131 
  132 #define UNITS_BITSPERWORD       (sizeof(*ng_eiface_units) * NBBY)
  133 
  134 
  135 /************************************************************************
  136                         HELPER STUFF
  137  ************************************************************************/
  138 /*
  139  * Find the first free unit number for a new interface.
  140  * Increase the size of the unit bitmap as necessary.
  141  */
  142 static __inline__ int
  143 ng_eiface_get_unit(int *unit)
  144 {
  145         int index, bit;
  146 
  147         for (index = 0; index < ng_eiface_units_len
  148             && ng_eiface_units[index] == 0; index++);
  149         if (index == ng_eiface_units_len) {             /* extend array */
  150                 int i, *newarray, newlen;
  151 
  152                 newlen = (2 * ng_eiface_units_len) + 4;
  153                 MALLOC(newarray, int *, newlen * sizeof(*ng_eiface_units),
  154                     M_NETGRAPH, M_NOWAIT);
  155                 if (newarray == NULL)
  156                         return (ENOMEM);
  157                 bcopy(ng_eiface_units, newarray,
  158                     ng_eiface_units_len * sizeof(*ng_eiface_units));
  159                 for (i = ng_eiface_units_len; i < newlen; i++)
  160                         newarray[i] = ~0;
  161                 if (ng_eiface_units != NULL)
  162                         FREE(ng_eiface_units, M_NETGRAPH);
  163                 ng_eiface_units = newarray;
  164                 ng_eiface_units_len = newlen;
  165         }
  166         bit = ffs(ng_eiface_units[index]) - 1;
  167         KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
  168             ("%s: word=%d bit=%d", __func__, ng_eiface_units[index], bit));
  169         ng_eiface_units[index] &= ~(1 << bit);
  170         *unit = (index * UNITS_BITSPERWORD) + bit;
  171         ng_units_in_use++;
  172         return (0);
  173 }
  174 
  175 /*
  176  * Free a no longer needed unit number.
  177  */
  178 static __inline__ void
  179 ng_eiface_free_unit(int unit)
  180 {
  181         int index, bit;
  182 
  183         index = unit / UNITS_BITSPERWORD;
  184         bit = unit % UNITS_BITSPERWORD;
  185         KASSERT(index < ng_eiface_units_len,
  186             ("%s: unit=%d len=%d", __func__, unit, ng_eiface_units_len));
  187         KASSERT((ng_eiface_units[index] & (1 << bit)) == 0,
  188             ("%s: unit=%d is free", __func__, unit));
  189         ng_eiface_units[index] |= (1 << bit);
  190         /*
  191          * XXX We could think about reducing the size of ng_eiface_units[]
  192          * XXX here if the last portion is all ones
  193          * XXX At least free it if no more units.
  194          * Needed if we are to eventually be able to unload.
  195          */
  196         ng_units_in_use--;
  197         if (ng_units_in_use == 0) { /* XXX make SMP safe */
  198                 FREE(ng_eiface_units, M_NETGRAPH);
  199                 ng_eiface_units_len = 0;
  200                 ng_eiface_units = NULL;
  201         }
  202 }
  203 
  204 /************************************************************************
  205                         INTERFACE STUFF
  206  ************************************************************************/
  207 
  208 /*
  209  * Process an ioctl for the virtual interface
  210  */
  211 static int
  212 ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
  213 {
  214         struct ifreq   *const ifr = (struct ifreq *)data;
  215         int             s, error = 0;
  216 
  217 #ifdef DEBUG
  218         ng_eiface_print_ioctl(ifp, command, data);
  219 #endif
  220         s = splimp();
  221         switch (command)
  222         {
  223         /* These two are mostly handled at a higher layer */
  224         case SIOCSIFADDR:
  225                 error = ether_ioctl(ifp, command, data);
  226                 break;
  227         case SIOCGIFADDR:
  228                 break;
  229 
  230         /* Set flags */
  231         case SIOCSIFFLAGS:
  232                 /*
  233                  * If the interface is marked up and stopped, then
  234                  * start it. If it is marked down and running,
  235                  * then stop it.
  236                  */
  237                 if (ifr->ifr_flags & IFF_UP) {
  238                         if (!(ifp->if_flags & IFF_RUNNING)) {
  239                                 ifp->if_flags &= ~(IFF_OACTIVE);
  240                                 ifp->if_flags |= IFF_RUNNING;
  241                         }
  242                 } else {
  243                         if (ifp->if_flags & IFF_RUNNING)
  244                                 ifp->if_flags
  245                                         &= ~(IFF_RUNNING | IFF_OACTIVE);
  246                 }
  247                 break;
  248 
  249         /* Set the interface MTU */
  250         case SIOCSIFMTU:
  251                 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX
  252                 || ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
  253                         error = EINVAL;
  254                 else
  255                         ifp->if_mtu = ifr->ifr_mtu;
  256                 break;
  257 
  258         /* Stuff that's not supported */
  259         case SIOCADDMULTI:
  260         case SIOCDELMULTI:
  261                 error = 0;
  262                 break;
  263         case SIOCSIFPHYS:
  264                 error = EOPNOTSUPP;
  265                 break;
  266 
  267         default:
  268                 error = EINVAL;
  269                 break;
  270         }
  271         (void)splx(s);
  272         return (error);
  273 }
  274 
  275 static void
  276 ng_eiface_init(void *xsc)
  277 {
  278         priv_p          sc = xsc;
  279         struct ifnet   *ifp = sc->ifp;
  280         int             s;
  281 
  282         s = splimp();
  283 
  284         ifp->if_flags |= IFF_RUNNING;
  285         ifp->if_flags &= ~IFF_OACTIVE;
  286 
  287         splx(s);
  288 }
  289 
  290 /*
  291  * We simply relay the packet to the ether hook, if it is connected.
  292  * We have been throughthe netgraph locking an are guaranteed to 
  293  * be the only code running in this node at this time.
  294  */
  295 static void
  296 ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
  297 {
  298         struct ifnet *ifp = arg1;
  299         const priv_p priv = (priv_p) ifp->if_softc;
  300         int             len, error = 0;
  301         struct mbuf    *m;
  302 
  303         /* Check interface flags */
  304         if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
  305                 return;
  306 
  307         /* Don't do anything if output is active */
  308         if (ifp->if_flags & IFF_OACTIVE)
  309                 return;
  310 
  311         ifp->if_flags |= IFF_OACTIVE;
  312 
  313         /*
  314          * Grab a packet to transmit.
  315          */
  316         IF_DEQUEUE(&ifp->if_snd, m);
  317 
  318         /* If there's nothing to send, return. */
  319         if (m == NULL) {
  320                 ifp->if_flags &= ~IFF_OACTIVE;
  321                 return;
  322         }
  323 
  324         /* Berkeley packet filter
  325          * Pass packet to bpf if there is a listener.
  326          * XXX is this safe? locking?
  327          */
  328         BPF_MTAP(ifp, m);
  329 
  330         /* Copy length before the mbuf gets invalidated */
  331         len = m->m_pkthdr.len;
  332 
  333         /*
  334          * Send packet; if hook is not connected, mbuf will get
  335          * freed.
  336          */
  337         NG_SEND_DATA_ONLY(error, priv->ether, m);
  338 
  339         /* Update stats */
  340         if (error == 0) {
  341                 ifp->if_obytes += len;
  342                 ifp->if_opackets++;
  343         }
  344         ifp->if_flags &= ~IFF_OACTIVE;
  345         return;
  346 }
  347 
  348 /*
  349  * This routine is called to deliver a packet out the interface.
  350  * We simply queue the netgraph version to be called when netgraph locking
  351  * allows it to happen.
  352  * Until we know what the rest of the networking code is doing for
  353  * locking, we don't know how we will interact with it.
  354  * Take comfort from the fact that the ifnet struct is part of our
  355  * private info and can't go away while we are queued.
  356  * [Though we don't know it is still there now....]
  357  * it is possible we don't gain anything from this because
  358  * we would like to get the mbuf and queue it as data
  359  * somehow, but we can't and if we did would we solve anything?
  360  */
  361 static void
  362 ng_eiface_start(struct ifnet *ifp)
  363 {
  364         
  365         const priv_p priv = (priv_p) ifp->if_softc;
  366 
  367         ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0);
  368 }
  369 
  370 #ifdef DEBUG
  371 /*
  372  * Display an ioctl to the virtual interface
  373  */
  374 
  375 static void
  376 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data){
  377         char            *str;
  378 
  379         switch (command & IOC_DIRMASK)
  380         {
  381         case IOC_VOID:
  382                 str = "IO";
  383                 break;
  384         case IOC_OUT:
  385                 str = "IOR";
  386                 break;
  387         case IOC_IN:
  388                 str = "IOW";
  389                 break;
  390         case IOC_INOUT:
  391                 str = "IORW";
  392                 break;
  393         default:
  394                 str = "IO??";
  395         }
  396         log(LOG_DEBUG, "%s%d: %s('%c', %d, char[%d])\n",
  397                         ifp->if_name, ifp->if_unit,
  398                         str,
  399                         IOCGROUP(command),
  400                         command & 0xff,
  401                         IOCPARM_LEN(command));
  402 }
  403 #endif  /* DEBUG */
  404 
  405 /************************************************************************
  406                         NETGRAPH NODE STUFF
  407  ************************************************************************/
  408 
  409 /*
  410  * Constructor for a node
  411  */
  412 static int
  413 ng_eiface_constructor(node_p node)
  414 {
  415         struct ifnet   *ifp;
  416         priv_p          priv;
  417         int             error = 0;
  418 
  419         /* Allocate node and interface private structures */
  420         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_WAITOK);
  421         if (priv == NULL) {
  422                 return (ENOMEM);
  423         }
  424         bzero(priv, sizeof(*priv));
  425 
  426         ifp = &(priv->arpcom.ac_if);
  427 
  428         /* Link them together */
  429         ifp->if_softc = priv;
  430         priv->ifp = ifp;
  431 
  432         /* Get an interface unit number */
  433         if ((error = ng_eiface_get_unit(&priv->unit)) != 0) {
  434                 FREE(priv, M_NETGRAPH);
  435                 return (error);
  436         }
  437 
  438         /* Link together node and private info */
  439         NG_NODE_SET_PRIVATE(node, priv);
  440         priv->node = node;
  441 
  442         /* Initialize interface structure */
  443         ifp->if_name = ng_eiface_ifname;
  444         ifp->if_unit = priv->unit;
  445         ifp->if_init = ng_eiface_init;
  446         ifp->if_output = ether_output;
  447         ifp->if_start = ng_eiface_start;
  448         ifp->if_ioctl = ng_eiface_ioctl;
  449         ifp->if_watchdog = NULL;
  450         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
  451         ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
  452 
  453         /*
  454          * Give this node name * bzero(ifname, sizeof(ifname));
  455          * sprintf(ifname, "if%s%d", ifp->if_name, ifp->if_unit); (void)
  456          * ng_name_node(node, ifname);
  457          */
  458 
  459         /* Attach the interface */
  460         ether_ifattach(ifp, priv->arpcom.ac_enaddr);
  461 
  462         /* Done */
  463         return (0);
  464 }
  465 
  466 /*
  467  * Give our ok for a hook to be added
  468  */
  469 static int
  470 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
  471 {
  472         priv_p          priv = NG_NODE_PRIVATE(node);
  473 
  474         if (strcmp(name, NG_EIFACE_HOOK_ETHER))
  475                 return (EPFNOSUPPORT);
  476         if (priv->ether != NULL)
  477                 return (EISCONN);
  478         priv->ether = hook;
  479         NG_HOOK_SET_PRIVATE(hook, &priv->ether);
  480 
  481         return (0);
  482 }
  483 
  484 /*
  485  * Receive a control message
  486  */
  487 static int
  488 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
  489 {
  490         priv_p          priv = NG_NODE_PRIVATE(node);
  491         struct ifnet   *const ifp = priv->ifp;
  492         struct ng_mesg *resp = NULL;
  493         int             error = 0;
  494         struct ng_mesg *msg;
  495 
  496         NGI_GET_MSG(item, msg);
  497         switch          (msg->header.typecookie) {
  498         case NGM_EIFACE_COOKIE:
  499                 switch (msg->header.cmd) {
  500                 case NGM_EIFACE_SET:
  501                 {
  502                         struct ng_eiface_par *eaddr;
  503                         struct ifaddr *ifa;
  504                         struct sockaddr_dl *sdl;
  505 
  506                         if (msg->header.arglen != sizeof(struct ng_eiface_par)){
  507                                 error = EINVAL;
  508                                 break;
  509                         }
  510                         eaddr = (struct ng_eiface_par *)(msg->data);
  511 
  512                         priv->arpcom.ac_enaddr[0] = eaddr->oct0;
  513                         priv->arpcom.ac_enaddr[1] = eaddr->oct1;
  514                         priv->arpcom.ac_enaddr[2] = eaddr->oct2;
  515                         priv->arpcom.ac_enaddr[3] = eaddr->oct3;
  516                         priv->arpcom.ac_enaddr[4] = eaddr->oct4;
  517                         priv->arpcom.ac_enaddr[5] = eaddr->oct5;
  518 
  519                         /* And put it in the ifaddr list */
  520 #define IFP2AC(IFP) ((struct arpcom *)IFP)
  521                         TAILQ_FOREACH(ifa, &(ifp->if_addrhead), ifa_link) {
  522                                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  523                                 if (sdl->sdl_type == IFT_ETHER) {
  524                                         bcopy((IFP2AC(ifp))->ac_enaddr,
  525                                                 LLADDR(sdl), ifp->if_addrlen);
  526                                         break;
  527                                 }
  528                         }
  529                         break;
  530                 }
  531 
  532                 case NGM_EIFACE_GET_IFNAME:
  533                 {
  534                         struct ng_eiface_ifname *arg;
  535 
  536                         NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT);
  537                         if (resp == NULL) {
  538                                 error = ENOMEM;
  539                                 break;
  540                         }
  541                         arg = (struct ng_eiface_ifname *)resp->data;
  542                         sprintf(arg->ngif_name,
  543                                 "%s%d", ifp->if_name, ifp->if_unit);
  544                         break;
  545                 }
  546 
  547                 case NGM_EIFACE_GET_IFADDRS:
  548                 {
  549                         struct ifaddr  *ifa;
  550                         caddr_t         ptr;
  551                         int             buflen;
  552 
  553 #define SA_SIZE(s)      ((s)->sa_len<sizeof(*(s))? sizeof(*(s)):(s)->sa_len)
  554 
  555                         /* Determine size of response and allocate it */
  556                         buflen = 0;
  557                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
  558                         buflen += SA_SIZE(ifa->ifa_addr);
  559                         NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
  560                         if (resp == NULL) {
  561                                 error = ENOMEM;
  562                                 break;
  563                         }
  564                         /* Add addresses */
  565                         ptr = resp->data;
  566                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  567                                 const int       len = SA_SIZE(ifa->ifa_addr);
  568 
  569                                 if (buflen < len) {
  570                                         log(LOG_ERR, "%s%d: len changed?\n",
  571                                         ifp->if_name, ifp->if_unit);
  572                                         break;
  573                                 }
  574                                 bcopy(ifa->ifa_addr, ptr, len);
  575                                 ptr += len;
  576                                 buflen -= len;
  577                         }
  578                         break;
  579 #undef SA_SIZE
  580                 }
  581 
  582                 default:
  583                         error = EINVAL;
  584                         break;
  585                 } /* end of inner switch() */
  586                 break;
  587         default:
  588                 error = EINVAL;
  589                 break;
  590         }
  591         NG_RESPOND_MSG(error, node, item, resp);
  592         NG_FREE_MSG(msg);
  593         return (error);
  594 }
  595 
  596 /*
  597  * Recive data from a hook. Pass the packet to the ether_input routine.
  598  */
  599 static int
  600 ng_eiface_rcvdata(hook_p hook, item_p item)
  601 {
  602         priv_p          priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  603         struct ifnet   *const ifp = priv->ifp;
  604         struct mbuf *m;
  605 
  606         NGI_GET_M(item, m);
  607         /* Meta-data ends its life here... */
  608         NG_FREE_ITEM(item);
  609 
  610         if (m == NULL)
  611         {
  612                 printf("ng_eiface: mbuf is null.\n");
  613                 return (EINVAL);
  614         }
  615         if (!(ifp->if_flags & IFF_UP)) {
  616                 return (ENETDOWN);
  617         }
  618 
  619         /* Note receiving interface */
  620         m->m_pkthdr.rcvif = ifp;
  621 
  622         /* Update interface stats */
  623         ifp->if_ipackets++;
  624 
  625         (*ifp->if_input)(ifp, m);
  626 
  627         /* Done */
  628         return (0);
  629 }
  630 
  631 /*
  632  * the node.
  633  */
  634 static int
  635 ng_eiface_rmnode(node_p node)
  636 {
  637         priv_p          priv = NG_NODE_PRIVATE(node);
  638         struct ifnet   *const ifp = priv->ifp;
  639 
  640         ether_ifdetach(ifp);
  641         ng_eiface_free_unit(priv->unit);
  642         FREE(priv, M_NETGRAPH);
  643         NG_NODE_SET_PRIVATE(node, NULL);
  644         NG_NODE_UNREF(node);
  645         return (0);
  646 }
  647 
  648 
  649 /*
  650  * This is called once we've already connected a new hook to the other node.
  651  * It gives us a chance to balk at the last minute.
  652  */
  653 static int
  654 ng_eiface_connect(hook_p hook)
  655 {
  656         /* be really amiable and just say "YUP that's OK by me! " */
  657         return (0);
  658 }
  659 
  660 /*
  661  * Hook disconnection
  662  */
  663 static int
  664 ng_eiface_disconnect(hook_p hook)
  665 {
  666         priv_p          priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  667 
  668         priv->ether = NULL;
  669         return (0);
  670 }

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