ng_echo.c revision 52752
152419Sjulian 252419Sjulian/* 352419Sjulian * ng_echo.c 452419Sjulian * 552419Sjulian * Copyright (c) 1996-1999 Whistle Communications, Inc. 652419Sjulian * All rights reserved. 752419Sjulian * 852419Sjulian * Subject to the following obligations and disclaimer of warranty, use and 952419Sjulian * redistribution of this software, in source or object code forms, with or 1052419Sjulian * without modifications are expressly permitted by Whistle Communications; 1152419Sjulian * provided, however, that: 1252419Sjulian * 1. Any and all reproductions of the source or object code must include the 1352419Sjulian * copyright notice above and the following disclaimer of warranties; and 1452419Sjulian * 2. No rights are granted, in any manner or form, to use Whistle 1552419Sjulian * Communications, Inc. trademarks, including the mark "WHISTLE 1652419Sjulian * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 1752419Sjulian * such appears in the above copyright notice or in the software. 1852419Sjulian * 1952419Sjulian * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 2052419Sjulian * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 2152419Sjulian * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 2252419Sjulian * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 2352419Sjulian * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 2452419Sjulian * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 2552419Sjulian * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 2652419Sjulian * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 2752419Sjulian * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 2852419Sjulian * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 2952419Sjulian * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 3052419Sjulian * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 3152419Sjulian * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 3252419Sjulian * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 3352419Sjulian * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 3452419Sjulian * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 3552419Sjulian * OF SUCH DAMAGE. 3652419Sjulian * 3752419Sjulian * Author: Julian Elisher <julian@whistle.com> 3852419Sjulian * 3952419Sjulian * $FreeBSD: head/sys/netgraph/ng_echo.c 52752 1999-11-01 10:00:40Z julian $ 4052752Sjulian * $Whistle: ng_echo.c,v 1.13 1999/11/01 09:24:51 julian Exp $ 4152419Sjulian */ 4252419Sjulian 4352419Sjulian/* 4452419Sjulian * Netgraph "echo" node 4552419Sjulian * 4652419Sjulian * This node simply bounces data and messages back to whence they came. 4752419Sjulian */ 4852419Sjulian 4952419Sjulian#include <sys/param.h> 5052419Sjulian#include <sys/systm.h> 5152419Sjulian#include <sys/errno.h> 5252419Sjulian#include <sys/kernel.h> 5352419Sjulian#include <sys/malloc.h> 5452419Sjulian#include <sys/mbuf.h> 5552419Sjulian#include <sys/syslog.h> 5652419Sjulian#include <netgraph/ng_message.h> 5752419Sjulian#include <netgraph/netgraph.h> 5852419Sjulian#include <netgraph/ng_echo.h> 5952419Sjulian 6052419Sjulian/* Netgraph methods */ 6152752Sjulianstatic ng_rcvmsg_t nge_rcvmsg; 6252752Sjulianstatic ng_rcvdata_t nge_rcvdata; 6352752Sjulianstatic ng_disconnect_t nge_disconnect; 6452419Sjulian 6552419Sjulian/* Netgraph type */ 6652419Sjulianstatic struct ng_type typestruct = { 6752419Sjulian NG_VERSION, 6852419Sjulian NG_ECHO_NODE_TYPE, 6952419Sjulian NULL, 7052419Sjulian NULL, 7152419Sjulian nge_rcvmsg, 7252419Sjulian NULL, 7352419Sjulian NULL, 7452419Sjulian NULL, 7552419Sjulian NULL, 7652419Sjulian nge_rcvdata, 7752419Sjulian nge_rcvdata, 7852419Sjulian nge_disconnect 7952419Sjulian}; 8052419SjulianNETGRAPH_INIT(echo, &typestruct); 8152419Sjulian 8252419Sjulian/* 8352419Sjulian * Receive control message. We just bounce it back as a reply. 8452419Sjulian */ 8552419Sjulianstatic int 8652419Sjuliannge_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, 8752419Sjulian struct ng_mesg **rptr) 8852419Sjulian{ 8952419Sjulian if (rptr) { 9052419Sjulian msg->header.flags |= NGF_RESP; 9152419Sjulian *rptr = msg; 9252419Sjulian } else { 9352419Sjulian FREE(msg, M_NETGRAPH); 9452419Sjulian } 9552419Sjulian return (0); 9652419Sjulian} 9752419Sjulian 9852419Sjulian/* 9952419Sjulian * Receive data 10052419Sjulian */ 10152419Sjulianstatic int 10252419Sjuliannge_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 10352419Sjulian{ 10452419Sjulian int error = 0; 10552419Sjulian 10652419Sjulian NG_SEND_DATA(error, hook, m, meta); 10752419Sjulian return (error); 10852419Sjulian} 10952419Sjulian 11052419Sjulian/* 11152419Sjulian * Removal of the last link destroys the nodeo 11252419Sjulian */ 11352419Sjulianstatic int 11452419Sjuliannge_disconnect(hook_p hook) 11552419Sjulian{ 11652419Sjulian if (hook->node->numhooks == 0) 11752419Sjulian ng_rmnode(hook->node); 11852419Sjulian return (0); 11952419Sjulian} 12052419Sjulian 121