The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_eiface.c

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    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/5.2/sys/netgraph/ng_eiface.c 122864 2003-11-17 19:13:01Z ru $
   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 /* We keep a bitmap indicating which unit numbers are free.
  125    One means the unit number is free, zero means it's taken. */
  126 static int      *ng_eiface_units = NULL;
  127 static int      ng_eiface_units_len = 0;
  128 static int      ng_units_in_use = 0;
  129 
  130 #define UNITS_BITSPERWORD       (sizeof(*ng_eiface_units) * NBBY)
  131 
  132 
  133 /************************************************************************
  134                         HELPER STUFF
  135  ************************************************************************/
  136 /*
  137  * Find the first free unit number for a new interface.
  138  * Increase the size of the unit bitmap as necessary.
  139  */
  140 static __inline__ int
  141 ng_eiface_get_unit(int *unit)
  142 {
  143         int index, bit;
  144 
  145         for (index = 0; index < ng_eiface_units_len
  146             && ng_eiface_units[index] == 0; index++);
  147         if (index == ng_eiface_units_len) {             /* extend array */
  148                 int i, *newarray, newlen;
  149 
  150                 newlen = (2 * ng_eiface_units_len) + 4;
  151                 MALLOC(newarray, int *, newlen * sizeof(*ng_eiface_units),
  152                     M_NETGRAPH, M_NOWAIT);
  153                 if (newarray == NULL)
  154                         return (ENOMEM);
  155                 bcopy(ng_eiface_units, newarray,
  156                     ng_eiface_units_len * sizeof(*ng_eiface_units));
  157                 for (i = ng_eiface_units_len; i < newlen; i++)
  158                         newarray[i] = ~0;
  159                 if (ng_eiface_units != NULL)
  160                         FREE(ng_eiface_units, M_NETGRAPH);
  161                 ng_eiface_units = newarray;
  162                 ng_eiface_units_len = newlen;
  163         }
  164         bit = ffs(ng_eiface_units[index]) - 1;
  165         KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
  166             ("%s: word=%d bit=%d", __func__, ng_eiface_units[index], bit));
  167         ng_eiface_units[index] &= ~(1 << bit);
  168         *unit = (index * UNITS_BITSPERWORD) + bit;
  169         ng_units_in_use++;
  170         return (0);
  171 }
  172 
  173 /*
  174  * Free a no longer needed unit number.
  175  */
  176 static __inline__ void
  177 ng_eiface_free_unit(int unit)
  178 {
  179         int index, bit;
  180 
  181         index = unit / UNITS_BITSPERWORD;
  182         bit = unit % UNITS_BITSPERWORD;
  183         KASSERT(index < ng_eiface_units_len,
  184             ("%s: unit=%d len=%d", __func__, unit, ng_eiface_units_len));
  185         KASSERT((ng_eiface_units[index] & (1 << bit)) == 0,
  186             ("%s: unit=%d is free", __func__, unit));
  187         ng_eiface_units[index] |= (1 << bit);
  188         /*
  189          * XXX We could think about reducing the size of ng_eiface_units[]
  190          * XXX here if the last portion is all ones
  191          * XXX At least free it if no more units.
  192          * Needed if we are to eventually be able to unload.
  193          */
  194         ng_units_in_use--;
  195         if (ng_units_in_use == 0) { /* XXX make SMP safe */
  196                 FREE(ng_eiface_units, M_NETGRAPH);
  197                 ng_eiface_units_len = 0;
  198                 ng_eiface_units = NULL;
  199         }
  200 }
  201 
  202 /************************************************************************
  203                         INTERFACE STUFF
  204  ************************************************************************/
  205 
  206 /*
  207  * Process an ioctl for the virtual interface
  208  */
  209 static int
  210 ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
  211 {
  212         struct ifreq   *const ifr = (struct ifreq *)data;
  213         int             s, error = 0;
  214 
  215 #ifdef DEBUG
  216         ng_eiface_print_ioctl(ifp, command, data);
  217 #endif
  218         s = splimp();
  219         switch (command)
  220         {
  221         /* These two are mostly handled at a higher layer */
  222         case SIOCSIFADDR:
  223                 error = ether_ioctl(ifp, command, data);
  224                 break;
  225         case SIOCGIFADDR:
  226                 break;
  227 
  228         /* Set flags */
  229         case SIOCSIFFLAGS:
  230                 /*
  231                  * If the interface is marked up and stopped, then
  232                  * start it. If it is marked down and running,
  233                  * then stop it.
  234                  */
  235                 if (ifr->ifr_flags & IFF_UP) {
  236                         if (!(ifp->if_flags & IFF_RUNNING)) {
  237                                 ifp->if_flags &= ~(IFF_OACTIVE);
  238                                 ifp->if_flags |= IFF_RUNNING;
  239                         }
  240                 } else {
  241                         if (ifp->if_flags & IFF_RUNNING)
  242                                 ifp->if_flags
  243                                         &= ~(IFF_RUNNING | IFF_OACTIVE);
  244                 }
  245                 break;
  246 
  247         /* Set the interface MTU */
  248         case SIOCSIFMTU:
  249                 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX
  250                 || ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
  251                         error = EINVAL;
  252                 else
  253                         ifp->if_mtu = ifr->ifr_mtu;
  254                 break;
  255 
  256         /* Stuff that's not supported */
  257         case SIOCADDMULTI:
  258         case SIOCDELMULTI:
  259                 error = 0;
  260                 break;
  261         case SIOCSIFPHYS:
  262                 error = EOPNOTSUPP;
  263                 break;
  264 
  265         default:
  266                 error = EINVAL;
  267                 break;
  268         }
  269         (void)splx(s);
  270         return (error);
  271 }
  272 
  273 static void
  274 ng_eiface_init(void *xsc)
  275 {
  276         priv_p          sc = xsc;
  277         struct ifnet   *ifp = sc->ifp;
  278         int             s;
  279 
  280         s = splimp();
  281 
  282         ifp->if_flags |= IFF_RUNNING;
  283         ifp->if_flags &= ~IFF_OACTIVE;
  284 
  285         splx(s);
  286 }
  287 
  288 /*
  289  * We simply relay the packet to the ether hook, if it is connected.
  290  * We have been throughthe netgraph locking an are guaranteed to 
  291  * be the only code running in this node at this time.
  292  */
  293 static void
  294 ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
  295 {
  296         struct ifnet *ifp = arg1;
  297         const priv_p priv = (priv_p) ifp->if_softc;
  298         int             len, error = 0;
  299         struct mbuf    *m;
  300 
  301         /* Check interface flags */
  302         if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
  303                 return;
  304 
  305         /* Don't do anything if output is active */
  306         if (ifp->if_flags & IFF_OACTIVE)
  307                 return;
  308 
  309         ifp->if_flags |= IFF_OACTIVE;
  310 
  311         /*
  312          * Grab a packet to transmit.
  313          */
  314         IF_DEQUEUE(&ifp->if_snd, m);
  315 
  316         /* If there's nothing to send, return. */
  317         if (m == NULL) {
  318                 ifp->if_flags &= ~IFF_OACTIVE;
  319                 return;
  320         }
  321 
  322         /* Berkeley packet filter
  323          * Pass packet to bpf if there is a listener.
  324          * XXX is this safe? locking?
  325          */
  326         BPF_MTAP(ifp, m);
  327 
  328         /* Copy length before the mbuf gets invalidated */
  329         len = m->m_pkthdr.len;
  330 
  331         /*
  332          * Send packet; if hook is not connected, mbuf will get
  333          * freed.
  334          */
  335         NG_SEND_DATA_ONLY(error, priv->ether, m);
  336 
  337         /* Update stats */
  338         if (error == 0) {
  339                 ifp->if_obytes += len;
  340                 ifp->if_opackets++;
  341         }
  342         ifp->if_flags &= ~IFF_OACTIVE;
  343         return;
  344 }
  345 
  346 /*
  347  * This routine is called to deliver a packet out the interface.
  348  * We simply queue the netgraph version to be called when netgraph locking
  349  * allows it to happen.
  350  * Until we know what the rest of the networking code is doing for
  351  * locking, we don't know how we will interact with it.
  352  * Take comfort from the fact that the ifnet struct is part of our
  353  * private info and can't go away while we are queued.
  354  * [Though we don't know it is still there now....]
  355  * it is possible we don't gain anything from this because
  356  * we would like to get the mbuf and queue it as data
  357  * somehow, but we can't and if we did would we solve anything?
  358  */
  359 static void
  360 ng_eiface_start(struct ifnet *ifp)
  361 {
  362         
  363         const priv_p priv = (priv_p) ifp->if_softc;
  364 
  365         ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0);
  366 }
  367 
  368 #ifdef DEBUG
  369 /*
  370  * Display an ioctl to the virtual interface
  371  */
  372 
  373 static void
  374 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data){
  375         char            *str;
  376 
  377         switch (command & IOC_DIRMASK)
  378         {
  379         case IOC_VOID:
  380                 str = "IO";
  381                 break;
  382         case IOC_OUT:
  383                 str = "IOR";
  384                 break;
  385         case IOC_IN:
  386                 str = "IOW";
  387                 break;
  388         case IOC_INOUT:
  389                 str = "IORW";
  390                 break;
  391         default:
  392                 str = "IO??";
  393         }
  394         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
  395                         ifp->if_xname,
  396                         str,
  397                         IOCGROUP(command),
  398                         command & 0xff,
  399                         IOCPARM_LEN(command));
  400 }
  401 #endif  /* DEBUG */
  402 
  403 /************************************************************************
  404                         NETGRAPH NODE STUFF
  405  ************************************************************************/
  406 
  407 /*
  408  * Constructor for a node
  409  */
  410 static int
  411 ng_eiface_constructor(node_p node)
  412 {
  413         struct ifnet   *ifp;
  414         priv_p          priv;
  415         int             error = 0;
  416 
  417         /* Allocate node and interface private structures */
  418         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_WAITOK);
  419         if (priv == NULL) {
  420                 return (ENOMEM);
  421         }
  422         bzero(priv, sizeof(*priv));
  423 
  424         ifp = &(priv->arpcom.ac_if);
  425 
  426         /* Link them together */
  427         ifp->if_softc = priv;
  428         priv->ifp = ifp;
  429 
  430         /* Get an interface unit number */
  431         if ((error = ng_eiface_get_unit(&priv->unit)) != 0) {
  432                 FREE(priv, M_NETGRAPH);
  433                 return (error);
  434         }
  435 
  436         /* Link together node and private info */
  437         NG_NODE_SET_PRIVATE(node, priv);
  438         priv->node = node;
  439 
  440         /* Initialize interface structure */
  441         if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
  442         ifp->if_init = ng_eiface_init;
  443         ifp->if_output = ether_output;
  444         ifp->if_start = ng_eiface_start;
  445         ifp->if_ioctl = ng_eiface_ioctl;
  446         ifp->if_watchdog = NULL;
  447         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
  448         ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
  449 
  450         /*
  451          * Give this node name * bzero(ifname, sizeof(ifname));
  452          * sprintf(ifname, "if%s", ifp->if_xname); (void)
  453          * ng_name_node(node, ifname);
  454          */
  455 
  456         /* Attach the interface */
  457         ether_ifattach(ifp, priv->arpcom.ac_enaddr);
  458 
  459         /* Done */
  460         return (0);
  461 }
  462 
  463 /*
  464  * Give our ok for a hook to be added
  465  */
  466 static int
  467 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
  468 {
  469         priv_p          priv = NG_NODE_PRIVATE(node);
  470 
  471         if (strcmp(name, NG_EIFACE_HOOK_ETHER))
  472                 return (EPFNOSUPPORT);
  473         if (priv->ether != NULL)
  474                 return (EISCONN);
  475         priv->ether = hook;
  476         NG_HOOK_SET_PRIVATE(hook, &priv->ether);
  477 
  478         return (0);
  479 }
  480 
  481 /*
  482  * Receive a control message
  483  */
  484 static int
  485 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
  486 {
  487         priv_p          priv = NG_NODE_PRIVATE(node);
  488         struct ifnet   *const ifp = priv->ifp;
  489         struct ng_mesg *resp = NULL;
  490         int             error = 0;
  491         struct ng_mesg *msg;
  492 
  493         NGI_GET_MSG(item, msg);
  494         switch          (msg->header.typecookie) {
  495         case NGM_EIFACE_COOKIE:
  496                 switch (msg->header.cmd) {
  497                 case NGM_EIFACE_SET:
  498                 {
  499                         struct ng_eiface_par *eaddr;
  500                         struct ifaddr *ifa;
  501                         struct sockaddr_dl *sdl;
  502 
  503                         if (msg->header.arglen != sizeof(struct ng_eiface_par)){
  504                                 error = EINVAL;
  505                                 break;
  506                         }
  507                         eaddr = (struct ng_eiface_par *)(msg->data);
  508 
  509                         priv->arpcom.ac_enaddr[0] = eaddr->oct0;
  510                         priv->arpcom.ac_enaddr[1] = eaddr->oct1;
  511                         priv->arpcom.ac_enaddr[2] = eaddr->oct2;
  512                         priv->arpcom.ac_enaddr[3] = eaddr->oct3;
  513                         priv->arpcom.ac_enaddr[4] = eaddr->oct4;
  514                         priv->arpcom.ac_enaddr[5] = eaddr->oct5;
  515 
  516                         /* And put it in the ifaddr list */
  517 #define IFP2AC(IFP) ((struct arpcom *)IFP)
  518                         TAILQ_FOREACH(ifa, &(ifp->if_addrhead), ifa_link) {
  519                                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  520                                 if (sdl->sdl_type == IFT_ETHER) {
  521                                         bcopy((IFP2AC(ifp))->ac_enaddr,
  522                                                 LLADDR(sdl), ifp->if_addrlen);
  523                                         break;
  524                                 }
  525                         }
  526                         break;
  527                 }
  528 
  529                 case NGM_EIFACE_GET_IFNAME:
  530                 {
  531                         struct ng_eiface_ifname *arg;
  532 
  533                         NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT);
  534                         if (resp == NULL) {
  535                                 error = ENOMEM;
  536                                 break;
  537                         }
  538                         arg = (struct ng_eiface_ifname *)resp->data;
  539                         strlcpy(arg->ngif_name, ifp->if_xname,
  540                             sizeof(arg->ngif_name));
  541                         break;
  542                 }
  543 
  544                 case NGM_EIFACE_GET_IFADDRS:
  545                 {
  546                         struct ifaddr  *ifa;
  547                         caddr_t         ptr;
  548                         int             buflen;
  549 
  550 #define SA_SIZE(s)      ((s)->sa_len<sizeof(*(s))? sizeof(*(s)):(s)->sa_len)
  551 
  552                         /* Determine size of response and allocate it */
  553                         buflen = 0;
  554                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
  555                         buflen += SA_SIZE(ifa->ifa_addr);
  556                         NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
  557                         if (resp == NULL) {
  558                                 error = ENOMEM;
  559                                 break;
  560                         }
  561                         /* Add addresses */
  562                         ptr = resp->data;
  563                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  564                                 const int       len = SA_SIZE(ifa->ifa_addr);
  565 
  566                                 if (buflen < len) {
  567                                         log(LOG_ERR, "%s: len changed?\n",
  568                                         ifp->if_xname);
  569                                         break;
  570                                 }
  571                                 bcopy(ifa->ifa_addr, ptr, len);
  572                                 ptr += len;
  573                                 buflen -= len;
  574                         }
  575                         break;
  576 #undef SA_SIZE
  577                 }
  578 
  579                 default:
  580                         error = EINVAL;
  581                         break;
  582                 } /* end of inner switch() */
  583                 break;
  584         default:
  585                 error = EINVAL;
  586                 break;
  587         }
  588         NG_RESPOND_MSG(error, node, item, resp);
  589         NG_FREE_MSG(msg);
  590         return (error);
  591 }
  592 
  593 /*
  594  * Recive data from a hook. Pass the packet to the ether_input routine.
  595  */
  596 static int
  597 ng_eiface_rcvdata(hook_p hook, item_p item)
  598 {
  599         priv_p          priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  600         struct ifnet   *const ifp = priv->ifp;
  601         struct mbuf *m;
  602 
  603         NGI_GET_M(item, m);
  604         /* Meta-data ends its life here... */
  605         NG_FREE_ITEM(item);
  606 
  607         if (m == NULL)
  608         {
  609                 printf("ng_eiface: mbuf is null.\n");
  610                 return (EINVAL);
  611         }
  612         if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
  613                 NG_FREE_M(m);
  614                 return (ENETDOWN);
  615         }
  616 
  617         /* Note receiving interface */
  618         m->m_pkthdr.rcvif = ifp;
  619 
  620         /* Update interface stats */
  621         ifp->if_ipackets++;
  622 
  623         (*ifp->if_input)(ifp, m);
  624 
  625         /* Done */
  626         return (0);
  627 }
  628 
  629 /*
  630  * the node.
  631  */
  632 static int
  633 ng_eiface_rmnode(node_p node)
  634 {
  635         priv_p          priv = NG_NODE_PRIVATE(node);
  636         struct ifnet   *const ifp = priv->ifp;
  637 
  638         ether_ifdetach(ifp);
  639         ng_eiface_free_unit(priv->unit);
  640         FREE(priv, M_NETGRAPH);
  641         NG_NODE_SET_PRIVATE(node, NULL);
  642         NG_NODE_UNREF(node);
  643         return (0);
  644 }
  645 
  646 
  647 /*
  648  * This is called once we've already connected a new hook to the other node.
  649  * It gives us a chance to balk at the last minute.
  650  */
  651 static int
  652 ng_eiface_connect(hook_p hook)
  653 {
  654         /* be really amiable and just say "YUP that's OK by me! " */
  655         return (0);
  656 }
  657 
  658 /*
  659  * Hook disconnection
  660  */
  661 static int
  662 ng_eiface_disconnect(hook_p hook)
  663 {
  664         priv_p          priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  665 
  666         priv->ether = NULL;
  667         return (0);
  668 }

Cache object: f571401a597794af9ce2667b8d8725fc


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.