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Add a trivial node to reflect ethernet frames to whence they came.

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MFC after: 1 month
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Julian Elischer 2008-12-25 00:01:29 +00:00
parent a8879d0d7d
commit a0b5197620
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=186481
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77
share/man/man4/ng_ether_echo.4 Normal file
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.\" 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: Archie Cobbs <archie@FreeBSD.org>
.\"
.\" $FreeBSD$
.\" $Whistle: ng_echo.8,v 1.4 1999/01/25 23:46:26 archie Exp $
.\"
.Dd December 24, 2008
.Dt NG_ETHER_ECHO 4
.Os
.Sh NAME
.Nm ng_ether_echo
.Nd netgraph ether_echo node type
.Sh SYNOPSIS
.In netgraph/ng_ether_echo.h
.Sh DESCRIPTION
The
.Nm ether_echo
node type reflects all data and control messages back to the sender.
It assumes (and does not check) that the packet is an ethernet frame,
and swaps teh source and destination addresses before echoing it.
This node type is used for testing and debugging.
.Sh HOOKS
A
.Nm ether_echo
node accepts any request to connect, regardless of the hook name,
as long as the name is unique.
.Sh CONTROL MESSAGES
This node type supports only the generic control messages.
Any other control messages are reflected back to the sender.
.Sh SHUTDOWN
This node shuts down upon receipt of a
.Dv NGM_SHUTDOWN
control message, or when all hooks have been disconnected.
.Sh SEE ALSO
.Xr netgraph 4 ,
.Xr ng_hole 4 ,
.Xr ng_echo 4 ,
.Xr ng_ether 4 ,
.Xr ngctl 8
.Sh HISTORY
The
.Nm
node type was implemented in
.Fx 8.0 .
.Sh AUTHORS
.An Julian Elischer Aq julian@FreeBSD.org

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sys/modules/netgraph/ether_echo/Makefile Normal file
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# $FreeBSD$
# $Whistle: Makefile,v 1.2 1999/01/19 19:39:20 archie Exp $
KMOD= ng_ether_echo
SRCS= ng_ether_echo.c
.include <bsd.kmod.mk>

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sys/netgraph/ng_ether_echo.c Normal file
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/*
* 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);
}

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/*
* ng_ether_echo.h
*/
/*-
* 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: Archie Cobbs <archie@freebsd.org>
*
* $FreeBSD$
* $Whistle: ng_echo.h,v 1.3 1999/01/20 00:22:12 archie Exp $
*/
#ifndef _NETGRAPH_NG_ETHER_ECHO_H_
#define _NETGRAPH_NG_ETHER_ECHO_H_
/* Node type name and magic cookie */
#define NG_ETHER_ECHO_NODE_TYPE "ether_echo"
#define NGM_ETHER_ECHO_COOKIE 1230155201
#endif /* _NETGRAPH_NG_ETHER_ECHO_H_ */