/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2004 Ruslan Ermilov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/systm.h>
#include <netgraph/ng_message.h>
#include <netgraph/ng_hub.h>
#include <netgraph/netgraph.h>
#ifdef NG_SEPARATE_MALLOC
static MALLOC_DEFINE(M_NETGRAPH_HUB, "netgraph_hub", "netgraph hub node");
#else
#define M_NETGRAPH_HUB M_NETGRAPH
#endif
/* Per-node private data */
struct ng_hub_private {
int persistent; /* can exist w/o hooks */
};
typedef struct ng_hub_private *priv_p;
/* Netgraph node methods */
static ng_constructor_t ng_hub_constructor;
static ng_rcvmsg_t ng_hub_rcvmsg;
static ng_shutdown_t ng_hub_shutdown;
static ng_rcvdata_t ng_hub_rcvdata;
static ng_disconnect_t ng_hub_disconnect;
/* List of commands and how to convert arguments to/from ASCII */
static const struct ng_cmdlist ng_hub_cmdlist[] = {
{
NGM_HUB_COOKIE,
NGM_HUB_SET_PERSISTENT,
"setpersistent",
NULL,
NULL
},
{ 0 }
};
static struct ng_type ng_hub_typestruct = {
.version = NG_ABI_VERSION,
.name = NG_HUB_NODE_TYPE,
.constructor = ng_hub_constructor,
.rcvmsg = ng_hub_rcvmsg,
.shutdown = ng_hub_shutdown,
.rcvdata = ng_hub_rcvdata,
.disconnect = ng_hub_disconnect,
.cmdlist = ng_hub_cmdlist,
};
NETGRAPH_INIT(hub, &ng_hub_typestruct);
static int
ng_hub_constructor(node_p node)
{
priv_p priv;
/* Allocate and initialize private info */
priv = malloc(sizeof(*priv), M_NETGRAPH_HUB, M_WAITOK | M_ZERO);
NG_NODE_SET_PRIVATE(node, priv);
return (0);
}
/*
* Receive a control message
*/
static int
ng_hub_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
const priv_p priv = NG_NODE_PRIVATE(node);
int error = 0;
struct ng_mesg *msg;
NGI_GET_MSG(item, msg);
if (msg->header.typecookie == NGM_HUB_COOKIE &&
msg->header.cmd == NGM_HUB_SET_PERSISTENT) {
priv->persistent = 1;
} else {
error = EINVAL;
}
NG_FREE_MSG(msg);
return (error);
}
static int
ng_hub_rcvdata(hook_p hook, item_p item)
{
const node_p node = NG_HOOK_NODE(hook);
int error = 0;
hook_p hook2;
struct mbuf * const m = NGI_M(item), *m2;
int nhooks;
if ((nhooks = NG_NODE_NUMHOOKS(node)) == 1) {
NG_FREE_ITEM(item);
return (0);
}
LIST_FOREACH(hook2, &node->nd_hooks, hk_hooks) {
if (hook2 == hook)
continue;
if (--nhooks == 1)
NG_FWD_ITEM_HOOK(error, item, hook2);
else {
if ((m2 = m_dup(m, M_NOWAIT)) == NULL) {
NG_FREE_ITEM(item);
return (ENOBUFS);
}
NG_SEND_DATA_ONLY(error, hook2, m2);
if (error)
continue; /* don't give up */
}
}
return (error);
}
/*
* Shutdown node
*/
static int
ng_hub_shutdown(node_p node)
{
const priv_p priv = NG_NODE_PRIVATE(node);
free(priv, M_NETGRAPH_HUB);
NG_NODE_SET_PRIVATE(node, NULL);
NG_NODE_UNREF(node);
return (0);
}
static int
ng_hub_disconnect(hook_p hook)
{
const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
NG_NODE_IS_VALID(NG_HOOK_NODE(hook)) && !priv->persistent)
ng_rmnode_self(NG_HOOK_NODE(hook));
return (0);
}
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