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


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

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    1 /*-
    2  *
    3  * Copyright (c) 1999-2000, 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  * $FreeBSD$
   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 <netgraph/ng_message.h>
   44 #include <netgraph/netgraph.h>
   45 #include <netgraph/ng_split.h>
   46 
   47 /* Netgraph methods */
   48 static ng_constructor_t ng_split_constructor;
   49 static ng_shutdown_t ng_split_shutdown;
   50 static ng_newhook_t ng_split_newhook;
   51 static ng_rcvdata_t ng_split_rcvdata;
   52 static ng_disconnect_t ng_split_disconnect;
   53 
   54 /* Node type descriptor */
   55 static struct ng_type typestruct = {
   56         .version =      NG_ABI_VERSION,
   57         .name =         NG_SPLIT_NODE_TYPE,
   58         .constructor =  ng_split_constructor,
   59         .shutdown =     ng_split_shutdown,
   60         .newhook =      ng_split_newhook,
   61         .rcvdata =      ng_split_rcvdata,
   62         .disconnect =   ng_split_disconnect,
   63 };
   64 NETGRAPH_INIT(ng_split, &typestruct);
   65 
   66 /* Node private data */
   67 struct ng_split_private {
   68         hook_p out;
   69         hook_p in;
   70         hook_p mixed;
   71         node_p  node;                   /* Our netgraph node */
   72 };
   73 typedef struct ng_split_private *priv_p;
   74 
   75 /************************************************************************
   76                         NETGRAPH NODE STUFF
   77  ************************************************************************/
   78 
   79 /*
   80  * Constructor for a node
   81  */
   82 static int
   83 ng_split_constructor(node_p node)
   84 {
   85         priv_p          priv;
   86 
   87         /* Allocate node */
   88         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_ZERO | M_NOWAIT);
   89         if (priv == NULL)
   90                 return (ENOMEM);
   91         bzero(priv, sizeof(*priv));
   92 
   93         /* Link together node and private info */
   94         NG_NODE_SET_PRIVATE(node, priv);
   95         priv->node = node;
   96 
   97         /* Done */
   98         return (0);
   99 }
  100 
  101 /*
  102  * Give our ok for a hook to be added
  103  */
  104 static int
  105 ng_split_newhook(node_p node, hook_p hook, const char *name)
  106 {
  107         priv_p          priv = NG_NODE_PRIVATE(node);
  108         hook_p          *localhook;
  109 
  110         if (strcmp(name, NG_SPLIT_HOOK_MIXED) == 0) {
  111                 localhook = &priv->mixed;
  112         } else if (strcmp(name, NG_SPLIT_HOOK_IN) == 0) {
  113                 localhook = &priv->in;
  114         } else if (strcmp(name, NG_SPLIT_HOOK_OUT) == 0) {
  115                 localhook = &priv->out;
  116         } else {
  117                 return (EPFNOSUPPORT);
  118         }
  119 
  120         if (*localhook != NULL)
  121                 return (EISCONN);
  122         *localhook = hook;
  123         NG_HOOK_SET_PRIVATE(hook, localhook);
  124 
  125         return (0);
  126 }
  127 
  128 /*
  129  * Recive data from a hook.
  130  */
  131 static int
  132 ng_split_rcvdata(hook_p hook, item_p item)
  133 {
  134         const priv_p    priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  135         int             error = 0;
  136 
  137         if (hook == priv->out) {
  138                 printf("ng_split: got packet from out hook!\n");
  139                 NG_FREE_ITEM(item);
  140                 error = EINVAL;
  141         } else if ((hook == priv->in) && (priv->mixed != NULL)) {
  142                 NG_FWD_ITEM_HOOK(error, item, priv->mixed);
  143         } else if ((hook == priv->mixed) && (priv->out != NULL)) {
  144                 NG_FWD_ITEM_HOOK(error, item, priv->out);
  145         }
  146 
  147         if (item)
  148                 NG_FREE_ITEM(item);
  149 
  150         return (error);
  151 }
  152 
  153 static int
  154 ng_split_shutdown(node_p node)
  155 {
  156         const priv_p    priv = NG_NODE_PRIVATE(node);
  157 
  158         NG_NODE_SET_PRIVATE(node, NULL);
  159         NG_NODE_UNREF(node);
  160         FREE(priv, M_NETGRAPH);
  161 
  162         return (0);
  163 }
  164 
  165 /*
  166  * Hook disconnection
  167  */
  168 static int
  169 ng_split_disconnect(hook_p hook)
  170 {
  171         hook_p          *localhook = NG_HOOK_PRIVATE(hook);
  172         
  173         KASSERT(localhook != NULL, ("%s: null info", __func__));
  174         *localhook = NULL;
  175         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  176             && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
  177                 ng_rmnode_self(NG_HOOK_NODE(hook));
  178         }
  179 
  180         return (0);
  181 }

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