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