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: releng/9.2/sys/netgraph/ng_split.c 220768 2011-04-18 09:12:27Z glebius $
   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         priv = malloc(sizeof(*priv), M_NETGRAPH, M_ZERO | M_WAITOK);
   89 
   90         /* Link together node and private info */
   91         NG_NODE_SET_PRIVATE(node, priv);
   92         priv->node = node;
   93 
   94         /* Done */
   95         return (0);
   96 }
   97 
   98 /*
   99  * Give our ok for a hook to be added
  100  */
  101 static int
  102 ng_split_newhook(node_p node, hook_p hook, const char *name)
  103 {
  104         priv_p          priv = NG_NODE_PRIVATE(node);
  105         hook_p          *localhook;
  106 
  107         if (strcmp(name, NG_SPLIT_HOOK_MIXED) == 0) {
  108                 localhook = &priv->mixed;
  109         } else if (strcmp(name, NG_SPLIT_HOOK_IN) == 0) {
  110                 localhook = &priv->in;
  111         } else if (strcmp(name, NG_SPLIT_HOOK_OUT) == 0) {
  112                 localhook = &priv->out;
  113         } else
  114                 return (EINVAL);
  115 
  116         if (*localhook != NULL)
  117                 return (EISCONN);
  118         *localhook = hook;
  119         NG_HOOK_SET_PRIVATE(hook, localhook);
  120 
  121         return (0);
  122 }
  123 
  124 /*
  125  * Recive data from a hook.
  126  */
  127 static int
  128 ng_split_rcvdata(hook_p hook, item_p item)
  129 {
  130         const priv_p    priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  131         int             error = 0;
  132 
  133         if (hook == priv->out) {
  134                 printf("ng_split: got packet from out hook!\n");
  135                 NG_FREE_ITEM(item);
  136                 error = EINVAL;
  137         } else if ((hook == priv->in) && (priv->mixed != NULL)) {
  138                 NG_FWD_ITEM_HOOK(error, item, priv->mixed);
  139         } else if ((hook == priv->mixed) && (priv->out != NULL)) {
  140                 NG_FWD_ITEM_HOOK(error, item, priv->out);
  141         }
  142 
  143         if (item)
  144                 NG_FREE_ITEM(item);
  145 
  146         return (error);
  147 }
  148 
  149 static int
  150 ng_split_shutdown(node_p node)
  151 {
  152         const priv_p    priv = NG_NODE_PRIVATE(node);
  153 
  154         NG_NODE_SET_PRIVATE(node, NULL);
  155         NG_NODE_UNREF(node);
  156         free(priv, M_NETGRAPH);
  157 
  158         return (0);
  159 }
  160 
  161 /*
  162  * Hook disconnection
  163  */
  164 static int
  165 ng_split_disconnect(hook_p hook)
  166 {
  167         hook_p          *localhook = NG_HOOK_PRIVATE(hook);
  168         
  169         KASSERT(localhook != NULL, ("%s: null info", __func__));
  170         *localhook = NULL;
  171         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  172             && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
  173                 ng_rmnode_self(NG_HOOK_NODE(hook));
  174         }
  175 
  176         return (0);
  177 }

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