174 lines
4.3 KiB
C
174 lines
4.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2004 Ruslan Ermilov
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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, this list of conditions and the following 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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#include <sys/param.h>
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#include <sys/errno.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/systm.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/ng_hub.h>
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#include <netgraph/netgraph.h>
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#ifdef NG_SEPARATE_MALLOC
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static MALLOC_DEFINE(M_NETGRAPH_HUB, "netgraph_hub", "netgraph hub node");
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#else
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#define M_NETGRAPH_HUB M_NETGRAPH
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#endif
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/* Per-node private data */
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struct ng_hub_private {
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int persistent; /* can exist w/o hooks */
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};
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typedef struct ng_hub_private *priv_p;
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/* Netgraph node methods */
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static ng_constructor_t ng_hub_constructor;
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static ng_rcvmsg_t ng_hub_rcvmsg;
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static ng_shutdown_t ng_hub_shutdown;
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static ng_rcvdata_t ng_hub_rcvdata;
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static ng_disconnect_t ng_hub_disconnect;
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/* List of commands and how to convert arguments to/from ASCII */
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static const struct ng_cmdlist ng_hub_cmdlist[] = {
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{
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NGM_HUB_COOKIE,
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NGM_HUB_SET_PERSISTENT,
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"setpersistent",
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NULL,
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NULL
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},
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{ 0 }
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};
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static struct ng_type ng_hub_typestruct = {
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.version = NG_ABI_VERSION,
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.name = NG_HUB_NODE_TYPE,
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.constructor = ng_hub_constructor,
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.rcvmsg = ng_hub_rcvmsg,
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.shutdown = ng_hub_shutdown,
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.rcvdata = ng_hub_rcvdata,
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.disconnect = ng_hub_disconnect,
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.cmdlist = ng_hub_cmdlist,
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};
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NETGRAPH_INIT(hub, &ng_hub_typestruct);
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static int
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ng_hub_constructor(node_p node)
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{
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priv_p priv;
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/* Allocate and initialize private info */
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priv = malloc(sizeof(*priv), M_NETGRAPH_HUB, M_WAITOK | M_ZERO);
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NG_NODE_SET_PRIVATE(node, priv);
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return (0);
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}
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/*
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* Receive a control message
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*/
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static int
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ng_hub_rcvmsg(node_p node, item_p item, hook_p lasthook)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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int error = 0;
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struct ng_mesg *msg;
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NGI_GET_MSG(item, msg);
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if (msg->header.typecookie == NGM_HUB_COOKIE &&
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msg->header.cmd == NGM_HUB_SET_PERSISTENT) {
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priv->persistent = 1;
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} else {
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error = EINVAL;
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}
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NG_FREE_MSG(msg);
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return (error);
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}
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static int
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ng_hub_rcvdata(hook_p hook, item_p item)
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{
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const node_p node = NG_HOOK_NODE(hook);
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int error = 0;
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hook_p hook2;
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struct mbuf * const m = NGI_M(item), *m2;
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int nhooks;
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if ((nhooks = NG_NODE_NUMHOOKS(node)) == 1) {
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NG_FREE_ITEM(item);
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return (0);
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}
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LIST_FOREACH(hook2, &node->nd_hooks, hk_hooks) {
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if (hook2 == hook)
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continue;
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if (--nhooks == 1)
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NG_FWD_ITEM_HOOK(error, item, hook2);
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else {
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if ((m2 = m_dup(m, M_NOWAIT)) == NULL) {
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NG_FREE_ITEM(item);
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return (ENOBUFS);
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}
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NG_SEND_DATA_ONLY(error, hook2, m2);
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if (error)
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continue; /* don't give up */
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}
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}
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return (error);
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}
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/*
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* Shutdown node
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*/
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static int
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ng_hub_shutdown(node_p node)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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free(priv, M_NETGRAPH_HUB);
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NG_NODE_SET_PRIVATE(node, NULL);
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NG_NODE_UNREF(node);
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return (0);
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}
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static int
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ng_hub_disconnect(hook_p hook)
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{
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const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
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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)) && !priv->persistent)
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ng_rmnode_self(NG_HOOK_NODE(hook));
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return (0);
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}
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