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_gif.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  * ng_gif.c
    3  *
    4  * Copyright 2001 The Aerospace Corporation.  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  *
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions, and the following 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  * 3. The name of The Aerospace Corporation may not be used to endorse or
   16  *    promote products derived from this software.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION ``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 AEROSPACE CORPORATION 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  *
   31  * Copyright (c) 1996-2000 Whistle Communications, Inc.
   32  * All rights reserved.
   33  * 
   34  * Subject to the following obligations and disclaimer of warranty, use and
   35  * redistribution of this software, in source or object code forms, with or
   36  * without modifications are expressly permitted by Whistle Communications;
   37  * provided, however, that:
   38  * 1. Any and all reproductions of the source or object code must include the
   39  *    copyright notice above and the following disclaimer of warranties; and
   40  * 2. No rights are granted, in any manner or form, to use Whistle
   41  *    Communications, Inc. trademarks, including the mark "WHISTLE
   42  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   43  *    such appears in the above copyright notice or in the software.
   44  * 
   45  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   46  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   47  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   48  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   49  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   50  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   51  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   52  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   53  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   54  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   55  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   56  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   57  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   60  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   61  * OF SUCH DAMAGE.
   62  *
   63  * $FreeBSD: releng/5.1/sys/netgraph/ng_gif.c 111119 2003-02-19 05:47:46Z imp $
   64  */
   65 
   66 /*
   67  * ng_gif(4) netgraph node type
   68  */
   69 
   70 #include <sys/param.h>
   71 #include <sys/systm.h>
   72 #include <sys/kernel.h>
   73 #include <sys/malloc.h>
   74 #include <sys/mbuf.h>
   75 #include <sys/errno.h>
   76 #include <sys/syslog.h>
   77 #include <sys/socket.h>
   78 
   79 #include <net/if.h>
   80 #include <net/route.h>
   81 #include <net/if_types.h>
   82 #include <net/if_var.h>
   83 #include <net/if_gif.h>
   84 
   85 #include <netgraph/ng_message.h>
   86 #include <netgraph/netgraph.h>
   87 #include <netgraph/ng_parse.h>
   88 #include <netgraph/ng_gif.h>
   89 
   90 #define IFP2NG(ifp)  ((struct ng_node *)((struct gif_softc *)(ifp))->gif_netgraph)
   91 
   92 /* Per-node private data */
   93 struct private {
   94         struct ifnet    *ifp;           /* associated interface */
   95         hook_p          lower;          /* lower OR orphan hook connection */
   96         u_char          lowerOrphan;    /* whether lower is lower or orphan */
   97 };
   98 typedef struct private *priv_p;
   99 
  100 /* Functional hooks called from if_gif.c */
  101 static void     ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af);
  102 static void     ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af);
  103 static void     ng_gif_attach(struct ifnet *ifp);
  104 static void     ng_gif_detach(struct ifnet *ifp); 
  105 
  106 /* Other functions */
  107 static void     ng_gif_input2(node_p node, struct mbuf **mp, int af);
  108 static int      ng_gif_glue_af(struct mbuf **mp, int af);
  109 static int      ng_gif_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
  110 
  111 /* Netgraph node methods */
  112 static ng_constructor_t ng_gif_constructor;
  113 static ng_rcvmsg_t      ng_gif_rcvmsg;
  114 static ng_shutdown_t    ng_gif_shutdown;
  115 static ng_newhook_t     ng_gif_newhook;
  116 static ng_connect_t     ng_gif_connect;
  117 static ng_rcvdata_t     ng_gif_rcvdata;
  118 static ng_disconnect_t  ng_gif_disconnect;
  119 static int              ng_gif_mod_event(module_t mod, int event, void *data);
  120 
  121 /* List of commands and how to convert arguments to/from ASCII */
  122 static const struct ng_cmdlist ng_gif_cmdlist[] = {
  123         {
  124           NGM_GIF_COOKIE,
  125           NGM_GIF_GET_IFNAME,
  126           "getifname",
  127           NULL,
  128           &ng_parse_string_type
  129         },
  130         {
  131           NGM_GIF_COOKIE,
  132           NGM_GIF_GET_IFINDEX,
  133           "getifindex",
  134           NULL,
  135           &ng_parse_int32_type
  136         },
  137         { 0 }
  138 };
  139 
  140 static struct ng_type ng_gif_typestruct = {
  141         NG_ABI_VERSION,
  142         NG_GIF_NODE_TYPE,
  143         ng_gif_mod_event,
  144         ng_gif_constructor,
  145         ng_gif_rcvmsg,
  146         ng_gif_shutdown,
  147         ng_gif_newhook,
  148         NULL,
  149         ng_gif_connect,
  150         ng_gif_rcvdata,
  151         ng_gif_disconnect,
  152         ng_gif_cmdlist,
  153 };
  154 MODULE_VERSION(ng_gif, 1);
  155 MODULE_DEPEND(ng_gif, if_gif, 1,1,1);
  156 NETGRAPH_INIT(gif, &ng_gif_typestruct);
  157 
  158 /******************************************************************
  159                        GIF FUNCTION HOOKS
  160 ******************************************************************/
  161 
  162 /*
  163  * Handle a packet that has come in on an interface. We get to
  164  * look at it here before any upper layer protocols do.
  165  *
  166  * NOTE: this function will get called at splimp()
  167  */
  168 static void
  169 ng_gif_input(struct ifnet *ifp, struct mbuf **mp, int af)
  170 {
  171         const node_p node = IFP2NG(ifp);
  172         const priv_p priv = NG_NODE_PRIVATE(node);
  173 
  174         /* If "lower" hook not connected, let packet continue */
  175         if (priv->lower == NULL || priv->lowerOrphan)
  176                 return;
  177         ng_gif_input2(node, mp, af);
  178 }
  179 
  180 /*
  181  * Handle a packet that has come in on an interface, and which
  182  * does not match any of our known protocols (an ``orphan'').
  183  *
  184  * NOTE: this function will get called at splimp()
  185  */
  186 static void
  187 ng_gif_input_orphan(struct ifnet *ifp, struct mbuf *m, int af)
  188 {
  189         const node_p node = IFP2NG(ifp);
  190         const priv_p priv = NG_NODE_PRIVATE(node);
  191 
  192         /* If "orphan" hook not connected, let packet continue */
  193         if (priv->lower == NULL || !priv->lowerOrphan) {
  194                 m_freem(m);
  195                 return;
  196         }
  197         ng_gif_input2(node, &m, af);
  198         if (m != NULL)
  199                 m_freem(m);
  200 }
  201 
  202 /*
  203  * Handle a packet that has come in on a gif interface.
  204  * Attach the address family to the mbuf for later use.
  205  *
  206  * NOTE: this function will get called at splimp()
  207  */
  208 static void
  209 ng_gif_input2(node_p node, struct mbuf **mp, int af)
  210 {
  211         const priv_p priv = NG_NODE_PRIVATE(node);
  212         int error;
  213 
  214         /* Glue address family on */
  215         if ((error = ng_gif_glue_af(mp, af)) != 0)
  216                 return;
  217 
  218         /* Send out lower/orphan hook */
  219         NG_SEND_DATA_ONLY(error, priv->lower, *mp);
  220         *mp = NULL;
  221 }
  222 
  223 /*
  224  * A new gif interface has been attached.
  225  * Create a new node for it, etc.
  226  */
  227 static void
  228 ng_gif_attach(struct ifnet *ifp)
  229 {
  230         char name[IFNAMSIZ + 1];
  231         priv_p priv;
  232         node_p node;
  233 
  234         /* Create node */
  235         KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
  236         snprintf(name, sizeof(name), "%s%d", ifp->if_name, ifp->if_unit);
  237         if (ng_make_node_common(&ng_gif_typestruct, &node) != 0) {
  238                 log(LOG_ERR, "%s: can't %s for %s\n",
  239                     __func__, "create node", name);
  240                 return;
  241         }
  242 
  243         /* Allocate private data */
  244         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
  245         if (priv == NULL) {
  246                 log(LOG_ERR, "%s: can't %s for %s\n",
  247                     __func__, "allocate memory", name);
  248                 NG_NODE_UNREF(node);
  249                 return;
  250         }
  251         NG_NODE_SET_PRIVATE(node, priv);
  252         priv->ifp = ifp;
  253         IFP2NG(ifp) = node;
  254 
  255         /* Try to give the node the same name as the interface */
  256         if (ng_name_node(node, name) != 0) {
  257                 log(LOG_WARNING, "%s: can't name node %s\n",
  258                     __func__, name);
  259         }
  260 }
  261 
  262 /*
  263  * An interface is being detached.
  264  * REALLY Destroy its node.
  265  */
  266 static void
  267 ng_gif_detach(struct ifnet *ifp)
  268 {
  269         const node_p node = IFP2NG(ifp);
  270         const priv_p priv = NG_NODE_PRIVATE(node);
  271 
  272         if (node == NULL)               /* no node (why not?), ignore */
  273                 return;
  274         NG_NODE_REALLY_DIE(node);       /* Force real removal of node */
  275         /*
  276          * We can't assume the ifnet is still around when we run shutdown
  277          * So zap it now. XXX We HOPE that anything running at this time
  278          * handles it (as it should in the non netgraph case).
  279          */
  280         IFP2NG(ifp) = NULL;
  281         priv->ifp = NULL;       /* XXX race if interrupted an output packet */
  282         ng_rmnode_self(node);           /* remove all netgraph parts */
  283 }
  284 
  285 /*
  286  * Optimization for gluing the address family onto
  287  * the front of an incoming packet.
  288  */
  289 static int
  290 ng_gif_glue_af(struct mbuf **mp, int af)
  291 {
  292         struct mbuf *m = *mp;
  293         int error = 0;
  294         sa_family_t tmp_af;
  295 
  296         tmp_af = (sa_family_t) af;
  297 
  298         /*
  299          * XXX: should try to bring back some of the optimizations from
  300          * ng_ether.c
  301          */
  302 
  303         /*
  304          * Doing anything more is likely to get more
  305          * expensive than it's worth..
  306          * it's probable that everything else is in one
  307          * big lump. The next node will do an m_pullup()
  308          * for exactly the amount of data it needs and
  309          * hopefully everything after that will not
  310          * need one. So let's just use M_PREPEND.
  311          */
  312         M_PREPEND(m, sizeof (tmp_af), M_DONTWAIT);
  313         if (m == NULL) {
  314                 error = ENOBUFS;
  315                 goto done;
  316         }
  317 
  318 #if 0
  319 copy:
  320 #endif
  321         /* Copy header and return (possibly new) mbuf */
  322         *mtod(m, sa_family_t *) = tmp_af;
  323 #if 0
  324         bcopy((caddr_t)&tmp_af, mtod(m, sa_family_t *), sizeof(tmp_af));
  325 #endif
  326 done:
  327         *mp = m;
  328         return error;
  329 }
  330 
  331 /******************************************************************
  332                     NETGRAPH NODE METHODS
  333 ******************************************************************/
  334 
  335 /*
  336  * It is not possible or allowable to create a node of this type.
  337  * Nodes get created when the interface is attached (or, when
  338  * this node type's KLD is loaded).
  339  */
  340 static int
  341 ng_gif_constructor(node_p node)
  342 {
  343         return (EINVAL);
  344 }
  345 
  346 /*
  347  * Check for attaching a new hook.
  348  */
  349 static  int
  350 ng_gif_newhook(node_p node, hook_p hook, const char *name)
  351 {
  352         const priv_p priv = NG_NODE_PRIVATE(node);
  353         u_char orphan = priv->lowerOrphan;
  354         hook_p *hookptr;
  355 
  356         /* Divert hook is an alias for lower */
  357         if (strcmp(name, NG_GIF_HOOK_DIVERT) == 0)
  358                 name = NG_GIF_HOOK_LOWER;
  359 
  360         /* Which hook? */
  361         if (strcmp(name, NG_GIF_HOOK_LOWER) == 0) {
  362                 hookptr = &priv->lower;
  363                 orphan = 0;
  364         } else if (strcmp(name, NG_GIF_HOOK_ORPHAN) == 0) {
  365                 hookptr = &priv->lower;
  366                 orphan = 1;
  367         } else
  368                 return (EINVAL);
  369 
  370         /* Check if already connected (shouldn't be, but doesn't hurt) */
  371         if (*hookptr != NULL)
  372                 return (EISCONN);
  373 
  374         /* OK */
  375         *hookptr = hook;
  376         priv->lowerOrphan = orphan;
  377         return (0);
  378 }
  379 
  380 /*
  381  * Hooks are attached, adjust to force queueing.
  382  * We don't really care which hook it is.
  383  * they should all be queuing for outgoing data.
  384  */
  385 static  int
  386 ng_gif_connect(hook_p hook)
  387 {
  388         NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
  389         return (0);
  390 }
  391 
  392 /*
  393  * Receive an incoming control message.
  394  */
  395 static int
  396 ng_gif_rcvmsg(node_p node, item_p item, hook_p lasthook)
  397 {
  398         const priv_p priv = NG_NODE_PRIVATE(node);
  399         struct ng_mesg *resp = NULL;
  400         int error = 0;
  401         struct ng_mesg *msg;
  402 
  403         NGI_GET_MSG(item, msg);
  404         switch (msg->header.typecookie) {
  405         case NGM_GIF_COOKIE:
  406                 switch (msg->header.cmd) {
  407                 case NGM_GIF_GET_IFNAME:
  408                         NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
  409                         if (resp == NULL) {
  410                                 error = ENOMEM;
  411                                 break;
  412                         }
  413                         snprintf(resp->data, IFNAMSIZ + 1,
  414                             "%s%d", priv->ifp->if_name, priv->ifp->if_unit);
  415                         break;
  416                 case NGM_GIF_GET_IFINDEX:
  417                         NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
  418                         if (resp == NULL) {
  419                                 error = ENOMEM;
  420                                 break;
  421                         }
  422                         *((u_int32_t *)resp->data) = priv->ifp->if_index;
  423                         break;
  424                 default:
  425                         error = EINVAL;
  426                         break;
  427                 }
  428                 break;
  429         default:
  430                 error = EINVAL;
  431                 break;
  432         }
  433         NG_RESPOND_MSG(error, node, item, resp);
  434         NG_FREE_MSG(msg);
  435         return (error);
  436 }
  437 
  438 /*
  439  * Receive data on a hook.
  440  */
  441 static int
  442 ng_gif_rcvdata(hook_p hook, item_p item)
  443 {
  444         const node_p node = NG_HOOK_NODE(hook);
  445         const priv_p priv = NG_NODE_PRIVATE(node);
  446         struct mbuf *m;
  447         meta_p meta;
  448 
  449         NGI_GET_M(item, m);
  450         NGI_GET_META(item, meta);
  451         NG_FREE_ITEM(item);
  452         if (hook == priv->lower)
  453                 return ng_gif_rcv_lower(node, m, meta);
  454         panic("%s: weird hook", __func__);
  455 }
  456 
  457 /*
  458  * Handle an mbuf received on the "lower" hook.
  459  */
  460 static int
  461 ng_gif_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
  462 {
  463         struct sockaddr dst;
  464         const priv_p priv = NG_NODE_PRIVATE(node);
  465 
  466         bzero(&dst, sizeof(dst));
  467 
  468         /* We don't process metadata. */
  469         NG_FREE_META(meta);
  470 
  471         /* Make sure header is fully pulled up */
  472         if (m->m_pkthdr.len < sizeof(sa_family_t)) {
  473                 NG_FREE_M(m);
  474                 return (EINVAL);
  475         }
  476         if (m->m_len < sizeof(sa_family_t)
  477             && (m = m_pullup(m, sizeof(sa_family_t))) == NULL) {
  478                 return (ENOBUFS);
  479         }
  480 
  481         dst.sa_family = *mtod(m, sa_family_t *);
  482         m_adj(m, sizeof(sa_family_t));
  483 
  484         /* Send it on its way */
  485         /*
  486          * XXX: gif_output only uses dst for the family and passes the
  487          * fourth argument (rt) to in{,6}_gif_output which ignore it.
  488          * If this changes ng_gif will probably break.
  489          */
  490         return gif_output(priv->ifp, m, &dst, NULL);
  491 }
  492 
  493 /*
  494  * Shutdown node. This resets the node but does not remove it
  495  * unless the REALLY_DIE flag is set.
  496  */
  497 static int
  498 ng_gif_shutdown(node_p node)
  499 {
  500         const priv_p priv = NG_NODE_PRIVATE(node);
  501 
  502         if (node->nd_flags & NG_REALLY_DIE) {
  503                 /*
  504                  * WE came here because the gif interface is being destroyed,
  505                  * so stop being persistant.
  506                  * Actually undo all the things we did on creation.
  507                  * Assume the ifp has already been freed.
  508                  */
  509                 NG_NODE_SET_PRIVATE(node, NULL);
  510                 FREE(priv, M_NETGRAPH);         
  511                 NG_NODE_UNREF(node);    /* free node itself */
  512                 return (0);
  513         }
  514         node->nd_flags &= ~NG_INVALID;  /* Signal ng_rmnode we are persisant */
  515         return (0);
  516 }
  517 
  518 /*
  519  * Hook disconnection.
  520  */
  521 static int
  522 ng_gif_disconnect(hook_p hook)
  523 {
  524         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  525 
  526         if (hook == priv->lower) {
  527                 priv->lower = NULL;
  528                 priv->lowerOrphan = 0;
  529         } else 
  530                 panic("%s: weird hook", __func__);
  531         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  532             && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  533                 ng_rmnode_self(NG_HOOK_NODE(hook));     /* reset node */
  534 
  535         return (0);
  536 }
  537 
  538 /******************************************************************
  539                         INITIALIZATION
  540 ******************************************************************/
  541 
  542 /*
  543  * Handle loading and unloading for this node type.
  544  */
  545 static int
  546 ng_gif_mod_event(module_t mod, int event, void *data)
  547 {
  548         struct ifnet *ifp;
  549         int error = 0;
  550         int s;
  551 
  552         s = splnet();
  553         switch (event) {
  554         case MOD_LOAD:
  555 
  556                 /* Register function hooks */
  557                 if (ng_gif_attach_p != NULL) {
  558                         error = EEXIST;
  559                         break;
  560                 }
  561                 ng_gif_attach_p = ng_gif_attach;
  562                 ng_gif_detach_p = ng_gif_detach;
  563                 ng_gif_input_p = ng_gif_input;
  564                 ng_gif_input_orphan_p = ng_gif_input_orphan;
  565 
  566                 /* Create nodes for any already-existing gif interfaces */
  567                 IFNET_RLOCK();
  568                 TAILQ_FOREACH(ifp, &ifnet, if_link) {
  569                         if (ifp->if_type == IFT_GIF)
  570                                 ng_gif_attach(ifp);
  571                 }
  572                 IFNET_RUNLOCK();
  573                 break;
  574 
  575         case MOD_UNLOAD:
  576 
  577                 /*
  578                  * Note that the base code won't try to unload us until
  579                  * all nodes have been removed, and that can't happen
  580                  * until all gif interfaces are destroyed. In any
  581                  * case, we know there are no nodes left if the action
  582                  * is MOD_UNLOAD, so there's no need to detach any nodes.
  583                  *
  584                  * XXX: what about manual unloads?!?
  585                  */
  586 
  587                 /* Unregister function hooks */
  588                 ng_gif_attach_p = NULL;
  589                 ng_gif_detach_p = NULL;
  590                 ng_gif_input_p = NULL;
  591                 ng_gif_input_orphan_p = NULL;
  592                 break;
  593 
  594         default:
  595                 error = EOPNOTSUPP;
  596                 break;
  597         }
  598         splx(s);
  599         return (error);
  600 }
  601 

Cache object: ac1de09f3494ceecb8d0a708ee96c505


[ 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.