152419Sjulian/* 252419Sjulian * ng_echo.c 3139823Simp */ 4139823Simp 5139823Simp/*- 652419Sjulian * Copyright (c) 1996-1999 Whistle Communications, Inc. 752419Sjulian * All rights reserved. 852419Sjulian * 952419Sjulian * Subject to the following obligations and disclaimer of warranty, use and 1052419Sjulian * redistribution of this software, in source or object code forms, with or 1152419Sjulian * without modifications are expressly permitted by Whistle Communications; 1252419Sjulian * provided, however, that: 1352419Sjulian * 1. Any and all reproductions of the source or object code must include the 1452419Sjulian * copyright notice above and the following disclaimer of warranties; and 1552419Sjulian * 2. No rights are granted, in any manner or form, to use Whistle 1652419Sjulian * Communications, Inc. trademarks, including the mark "WHISTLE 1752419Sjulian * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 1852419Sjulian * such appears in the above copyright notice or in the software. 1952419Sjulian * 2052419Sjulian * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 2152419Sjulian * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 2252419Sjulian * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 2352419Sjulian * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 2452419Sjulian * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 2552419Sjulian * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 2652419Sjulian * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 2752419Sjulian * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 2852419Sjulian * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 2952419Sjulian * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 3052419Sjulian * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 3152419Sjulian * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 3252419Sjulian * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 3352419Sjulian * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 3452419Sjulian * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 3552419Sjulian * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 3652419Sjulian * OF SUCH DAMAGE. 3752419Sjulian * 3867506Sjulian * Author: Julian Elisher <julian@freebsd.org> 3952419Sjulian * 4052419Sjulian * $FreeBSD$ 4152752Sjulian * $Whistle: ng_echo.c,v 1.13 1999/11/01 09:24:51 julian Exp $ 4252419Sjulian */ 4352419Sjulian 4452419Sjulian/* 4552419Sjulian * Netgraph "echo" node 4652419Sjulian * 4752419Sjulian * This node simply bounces data and messages back to whence they came. 4852419Sjulian */ 4952419Sjulian 5052419Sjulian#include <sys/param.h> 5170784Sjulian#include <sys/systm.h> 5252419Sjulian#include <sys/kernel.h> 5352419Sjulian#include <sys/malloc.h> 5452419Sjulian#include <sys/mbuf.h> 5552419Sjulian#include <netgraph/ng_message.h> 5652419Sjulian#include <netgraph/netgraph.h> 5752419Sjulian#include <netgraph/ng_echo.h> 5852419Sjulian 5952419Sjulian/* Netgraph methods */ 6070700Sjulianstatic ng_constructor_t nge_cons; 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 = { 67129823Sjulian .version = NG_ABI_VERSION, 68129823Sjulian .name = NG_ECHO_NODE_TYPE, 69129823Sjulian .constructor = nge_cons, 70129823Sjulian .rcvmsg = nge_rcvmsg, 71129823Sjulian .rcvdata = nge_rcvdata, 72129823Sjulian .disconnect = nge_disconnect, 7352419Sjulian}; 7452419SjulianNETGRAPH_INIT(echo, &typestruct); 7552419Sjulian 7670700Sjulianstatic int 7770700Sjuliannge_cons(node_p node) 7870700Sjulian{ 7970700Sjulian return (0); 8070700Sjulian} 8170700Sjulian 8252419Sjulian/* 8352419Sjulian * Receive control message. We just bounce it back as a reply. 8452419Sjulian */ 8552419Sjulianstatic int 8670700Sjuliannge_rcvmsg(node_p node, item_p item, hook_p lasthook) 8752419Sjulian{ 8870700Sjulian struct ng_mesg *msg; 8970700Sjulian int error = 0; 9070700Sjulian 9170700Sjulian NGI_GET_MSG(item, msg); 9270700Sjulian msg->header.flags |= NGF_RESP; 9370700Sjulian NG_RESPOND_MSG(error, node, item, msg); 9470700Sjulian return (error); 9552419Sjulian} 9652419Sjulian 9752419Sjulian/* 9852419Sjulian * Receive data 9952419Sjulian */ 10052419Sjulianstatic int 10170700Sjuliannge_rcvdata(hook_p hook, item_p item) 10252419Sjulian{ 103145101Sglebius int error; 10452419Sjulian 10570784Sjulian NG_FWD_ITEM_HOOK(error, item, hook); 106145101Sglebius return (error); 10752419Sjulian} 10852419Sjulian 10952419Sjulian/* 11052419Sjulian * Removal of the last link destroys the nodeo 11152419Sjulian */ 11252419Sjulianstatic int 11352419Sjuliannge_disconnect(hook_p hook) 11452419Sjulian{ 11570784Sjulian if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 11670784Sjulian && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) { 11770784Sjulian ng_rmnode_self(NG_HOOK_NODE(hook)); 11870700Sjulian } 11952419Sjulian return (0); 12052419Sjulian} 12152419Sjulian 122