mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-17 10:26:15 +00:00
146 lines
4.2 KiB
C
146 lines
4.2 KiB
C
/*
|
|
* ng_ether_echo.c
|
|
*/
|
|
|
|
/*-
|
|
* Copyright (c) 1996-1999 Whistle Communications, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* Subject to the following obligations and disclaimer of warranty, use and
|
|
* redistribution of this software, in source or object code forms, with or
|
|
* without modifications are expressly permitted by Whistle Communications;
|
|
* provided, however, that:
|
|
* 1. Any and all reproductions of the source or object code must include the
|
|
* copyright notice above and the following disclaimer of warranties; and
|
|
* 2. No rights are granted, in any manner or form, to use Whistle
|
|
* Communications, Inc. trademarks, including the mark "WHISTLE
|
|
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
|
|
* such appears in the above copyright notice or in the software.
|
|
*
|
|
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
|
|
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
|
|
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
|
|
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
|
|
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
|
|
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
|
|
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
|
|
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
|
|
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
|
|
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
|
|
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
|
|
* OF SUCH DAMAGE.
|
|
*
|
|
* Author: Julian Elisher <julian@freebsd.org>
|
|
*
|
|
* $FreeBSD$
|
|
* $Whistle: ng_echo.c,v 1.13 1999/11/01 09:24:51 julian Exp $
|
|
*/
|
|
|
|
/*
|
|
* Netgraph "ether_echo" node
|
|
*
|
|
* This node simply bounces data and messages back to whence they came.
|
|
* However it swaps the source and destination ether fields.
|
|
* No testing is done!
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <netgraph/ng_message.h>
|
|
#include <netgraph/netgraph.h>
|
|
#include <netgraph/ng_ether_echo.h>
|
|
|
|
#include <net/ethernet.h>
|
|
|
|
/* Netgraph methods */
|
|
static ng_constructor_t ngee_cons;
|
|
static ng_rcvmsg_t ngee_rcvmsg;
|
|
static ng_rcvdata_t ngee_rcvdata;
|
|
static ng_disconnect_t ngee_disconnect;
|
|
|
|
/* Netgraph type */
|
|
static struct ng_type typestruct = {
|
|
.version = NG_ABI_VERSION,
|
|
.name = NG_ETHER_ECHO_NODE_TYPE,
|
|
.constructor = ngee_cons,
|
|
.rcvmsg = ngee_rcvmsg,
|
|
.rcvdata = ngee_rcvdata,
|
|
.disconnect = ngee_disconnect,
|
|
};
|
|
NETGRAPH_INIT(ether_echo, &typestruct);
|
|
|
|
static int
|
|
ngee_cons(node_p node)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Receive control message. We just bounce it back as a reply.
|
|
*/
|
|
static int
|
|
ngee_rcvmsg(node_p node, item_p item, hook_p lasthook)
|
|
{
|
|
struct ng_mesg *msg;
|
|
int error = 0;
|
|
|
|
NGI_GET_MSG(item, msg);
|
|
msg->header.flags |= NGF_RESP;
|
|
NG_RESPOND_MSG(error, node, item, msg);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Receive data
|
|
*/
|
|
static int
|
|
ngee_rcvdata(hook_p hook, item_p item)
|
|
{
|
|
int error;
|
|
struct mbuf *m;
|
|
|
|
struct ether_header *eh;
|
|
struct ether_addr tmpaddr;
|
|
|
|
/* Make sure we have an entire header */
|
|
NGI_GET_M(item, m);
|
|
if (m->m_len < sizeof(*eh) ) {
|
|
m = m_pullup(m, sizeof(*eh));
|
|
if (m == NULL) {
|
|
NG_FREE_ITEM(item);
|
|
return(EINVAL);
|
|
}
|
|
}
|
|
eh = mtod(m, struct ether_header *);
|
|
|
|
/* swap the source and destination fields */
|
|
bcopy(eh->ether_dhost, &tmpaddr, ETHER_ADDR_LEN);
|
|
bcopy(eh->ether_shost, eh->ether_dhost, ETHER_ADDR_LEN);
|
|
bcopy(&tmpaddr, eh->ether_shost, ETHER_ADDR_LEN);
|
|
|
|
NG_FWD_NEW_DATA(error, item, hook, m);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Removal of the last link destroys the nodeo
|
|
*/
|
|
static int
|
|
ngee_disconnect(hook_p hook)
|
|
{
|
|
if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
|
|
&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
|
|
ng_rmnode_self(NG_HOOK_NODE(hook));
|
|
}
|
|
return (0);
|
|
}
|
|
|