180 lines
4.5 KiB
C
180 lines
4.5 KiB
C
/*-
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*
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* Copyright (c) 1999-2000, Vitaly V Belekhov
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/errno.h>
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#include <sys/sockio.h>
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#include <sys/socket.h>
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#include <sys/syslog.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/netgraph.h>
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#include <netgraph/ng_split.h>
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/* Netgraph methods */
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static ng_constructor_t ng_split_constructor;
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static ng_shutdown_t ng_split_shutdown;
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static ng_newhook_t ng_split_newhook;
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static ng_rcvdata_t ng_split_rcvdata;
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static ng_disconnect_t ng_split_disconnect;
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/* Node type descriptor */
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static struct ng_type typestruct = {
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.version = NG_ABI_VERSION,
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.name = NG_SPLIT_NODE_TYPE,
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.constructor = ng_split_constructor,
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.shutdown = ng_split_shutdown,
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.newhook = ng_split_newhook,
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.rcvdata = ng_split_rcvdata,
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.disconnect = ng_split_disconnect,
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};
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NETGRAPH_INIT(ng_split, &typestruct);
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/* Node private data */
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struct ng_split_private {
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hook_p out;
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hook_p in;
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hook_p mixed;
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node_p node; /* Our netgraph node */
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};
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typedef struct ng_split_private *priv_p;
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/************************************************************************
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NETGRAPH NODE STUFF
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************************************************************************/
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/*
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* Constructor for a node
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*/
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static int
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ng_split_constructor(node_p node)
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{
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priv_p priv;
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/* Allocate node */
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MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_ZERO | M_NOWAIT);
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if (priv == NULL)
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return (ENOMEM);
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/* Link together node and private info */
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NG_NODE_SET_PRIVATE(node, priv);
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priv->node = node;
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/* Done */
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return (0);
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}
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/*
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* Give our ok for a hook to be added
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*/
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static int
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ng_split_newhook(node_p node, hook_p hook, const char *name)
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{
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priv_p priv = NG_NODE_PRIVATE(node);
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hook_p *localhook;
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if (strcmp(name, NG_SPLIT_HOOK_MIXED) == 0) {
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localhook = &priv->mixed;
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} else if (strcmp(name, NG_SPLIT_HOOK_IN) == 0) {
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localhook = &priv->in;
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} else if (strcmp(name, NG_SPLIT_HOOK_OUT) == 0) {
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localhook = &priv->out;
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} else
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return (EINVAL);
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if (*localhook != NULL)
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return (EISCONN);
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*localhook = hook;
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NG_HOOK_SET_PRIVATE(hook, localhook);
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return (0);
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}
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/*
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* Recive data from a hook.
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*/
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static int
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ng_split_rcvdata(hook_p hook, item_p item)
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{
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const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
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int error = 0;
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if (hook == priv->out) {
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printf("ng_split: got packet from out hook!\n");
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NG_FREE_ITEM(item);
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error = EINVAL;
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} else if ((hook == priv->in) && (priv->mixed != NULL)) {
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NG_FWD_ITEM_HOOK(error, item, priv->mixed);
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} else if ((hook == priv->mixed) && (priv->out != NULL)) {
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NG_FWD_ITEM_HOOK(error, item, priv->out);
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}
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if (item)
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NG_FREE_ITEM(item);
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return (error);
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}
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static int
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ng_split_shutdown(node_p node)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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NG_NODE_SET_PRIVATE(node, NULL);
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NG_NODE_UNREF(node);
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FREE(priv, M_NETGRAPH);
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return (0);
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}
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/*
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* Hook disconnection
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*/
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static int
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ng_split_disconnect(hook_p hook)
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{
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hook_p *localhook = NG_HOOK_PRIVATE(hook);
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KASSERT(localhook != NULL, ("%s: null info", __func__));
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*localhook = NULL;
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if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
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&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
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ng_rmnode_self(NG_HOOK_NODE(hook));
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}
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return (0);
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}
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