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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 1999-2000, Vitaly V Belekhov
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice unmodified, this list of conditions, and the following
   12  *    disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/12.0/sys/netgraph/ng_split.c 326272 2017-11-27 15:23:17Z pfg $
   30  *
   31  */
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/errno.h>
   36 #include <sys/kernel.h>
   37 #include <sys/malloc.h>
   38 #include <sys/mbuf.h>
   39 #include <sys/errno.h>
   40 #include <sys/sockio.h>
   41 #include <sys/socket.h>
   42 #include <sys/syslog.h>
   43 
   44 #include <netgraph/ng_message.h>
   45 #include <netgraph/netgraph.h>
   46 #include <netgraph/ng_split.h>
   47 
   48 /* Netgraph methods */
   49 static ng_constructor_t ng_split_constructor;
   50 static ng_shutdown_t ng_split_shutdown;
   51 static ng_newhook_t ng_split_newhook;
   52 static ng_rcvdata_t ng_split_rcvdata;
   53 static ng_disconnect_t ng_split_disconnect;
   54 
   55 /* Node type descriptor */
   56 static struct ng_type typestruct = {
   57         .version =      NG_ABI_VERSION,
   58         .name =         NG_SPLIT_NODE_TYPE,
   59         .constructor =  ng_split_constructor,
   60         .shutdown =     ng_split_shutdown,
   61         .newhook =      ng_split_newhook,
   62         .rcvdata =      ng_split_rcvdata,
   63         .disconnect =   ng_split_disconnect,
   64 };
   65 NETGRAPH_INIT(ng_split, &typestruct);
   66 
   67 /* Node private data */
   68 struct ng_split_private {
   69         hook_p out;
   70         hook_p in;
   71         hook_p mixed;
   72         node_p  node;                   /* Our netgraph node */
   73 };
   74 typedef struct ng_split_private *priv_p;
   75 
   76 /************************************************************************
   77                         NETGRAPH NODE STUFF
   78  ************************************************************************/
   79 
   80 /*
   81  * Constructor for a node
   82  */
   83 static int
   84 ng_split_constructor(node_p node)
   85 {
   86         priv_p          priv;
   87 
   88         /* Allocate node */
   89         priv = malloc(sizeof(*priv), M_NETGRAPH, M_ZERO | M_WAITOK);
   90 
   91         /* Link together node and private info */
   92         NG_NODE_SET_PRIVATE(node, priv);
   93         priv->node = node;
   94 
   95         /* Done */
   96         return (0);
   97 }
   98 
   99 /*
  100  * Give our ok for a hook to be added
  101  */
  102 static int
  103 ng_split_newhook(node_p node, hook_p hook, const char *name)
  104 {
  105         priv_p          priv = NG_NODE_PRIVATE(node);
  106         hook_p          *localhook;
  107 
  108         if (strcmp(name, NG_SPLIT_HOOK_MIXED) == 0) {
  109                 localhook = &priv->mixed;
  110         } else if (strcmp(name, NG_SPLIT_HOOK_IN) == 0) {
  111                 localhook = &priv->in;
  112         } else if (strcmp(name, NG_SPLIT_HOOK_OUT) == 0) {
  113                 localhook = &priv->out;
  114         } else
  115                 return (EINVAL);
  116 
  117         if (*localhook != NULL)
  118                 return (EISCONN);
  119         *localhook = hook;
  120         NG_HOOK_SET_PRIVATE(hook, localhook);
  121 
  122         return (0);
  123 }
  124 
  125 /*
  126  * Recive data from a hook.
  127  */
  128 static int
  129 ng_split_rcvdata(hook_p hook, item_p item)
  130 {
  131         const priv_p    priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  132         int             error = 0;
  133 
  134         if (hook == priv->out) {
  135                 printf("ng_split: got packet from out hook!\n");
  136                 NG_FREE_ITEM(item);
  137                 error = EINVAL;
  138         } else if ((hook == priv->in) && (priv->mixed != NULL)) {
  139                 NG_FWD_ITEM_HOOK(error, item, priv->mixed);
  140         } else if ((hook == priv->mixed) && (priv->out != NULL)) {
  141                 NG_FWD_ITEM_HOOK(error, item, priv->out);
  142         }
  143 
  144         if (item)
  145                 NG_FREE_ITEM(item);
  146 
  147         return (error);
  148 }
  149 
  150 static int
  151 ng_split_shutdown(node_p node)
  152 {
  153         const priv_p    priv = NG_NODE_PRIVATE(node);
  154 
  155         NG_NODE_SET_PRIVATE(node, NULL);
  156         NG_NODE_UNREF(node);
  157         free(priv, M_NETGRAPH);
  158 
  159         return (0);
  160 }
  161 
  162 /*
  163  * Hook disconnection
  164  */
  165 static int
  166 ng_split_disconnect(hook_p hook)
  167 {
  168         hook_p          *localhook = NG_HOOK_PRIVATE(hook);
  169         
  170         KASSERT(localhook != NULL, ("%s: null info", __func__));
  171         *localhook = NULL;
  172         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  173             && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
  174                 ng_rmnode_self(NG_HOOK_NODE(hook));
  175         }
  176 
  177         return (0);
  178 }

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