ng_hole.c revision 70700
152419Sjulian 252419Sjulian/* 352419Sjulian * ng_hole.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 * 3767506Sjulian * Author: Julian Elisher <julian@freebsd.org> 3852419Sjulian * 3952419Sjulian * $FreeBSD: head/sys/netgraph/ng_hole.c 70700 2001-01-06 00:46:47Z julian $ 4052752Sjulian * $Whistle: ng_hole.c,v 1.10 1999/11/01 09:24:51 julian Exp $ 4152419Sjulian */ 4252419Sjulian 4352419Sjulian/* 4452419Sjulian * This node is a 'black hole' that simply discards everything it receives 4552419Sjulian */ 4652419Sjulian 4752419Sjulian#include <sys/param.h> 4852419Sjulian#include <sys/kernel.h> 4952419Sjulian#include <sys/malloc.h> 5052419Sjulian#include <sys/mbuf.h> 5152419Sjulian#include <netgraph/ng_message.h> 5252419Sjulian#include <netgraph/netgraph.h> 5352419Sjulian#include <netgraph/ng_hole.h> 5452419Sjulian 5552419Sjulian/* Netgraph methods */ 5670700Sjulianstatic ng_constructor_t ngh_cons; 5752752Sjulianstatic ng_rcvdata_t ngh_rcvdata; 5852752Sjulianstatic ng_disconnect_t ngh_disconnect; 5952419Sjulian 6052419Sjulianstatic struct ng_type typestruct = { 6170159Sjulian NG_ABI_VERSION, 6252419Sjulian NG_HOLE_NODE_TYPE, 6370700Sjulian NULL, /* modeventhand_t */ 6470700Sjulian ngh_cons, /* ng_constructor_t */ 6570700Sjulian NULL, /* ng_rcvmsg_t */ 6670700Sjulian NULL, /* ng_shutdown_t */ 6770700Sjulian NULL, /* ng_newhook_t */ 6870700Sjulian NULL, /* ng_findhook_t */ 6970700Sjulian NULL, /* ng_connect_t */ 7070700Sjulian ngh_rcvdata, /* ng_rcvdata_t */ 7170700Sjulian ngh_disconnect, /* ng_disconnect_t */ 7270700Sjulian NULL /* ng_cmdlist */ 7352419Sjulian}; 7452419SjulianNETGRAPH_INIT(hole, &typestruct); 7552419Sjulian 7670700Sjulian/* 7770700Sjulian * Be obliging. but no work to do. 7870700Sjulian */ 7970700Sjulianstatic int 8070700Sjulianngh_cons(node_p node) 8170700Sjulian{ 8270700Sjulian return(0); 8370700Sjulian} 8470700Sjulian 8552419Sjulian/* 8652419Sjulian * Receive data 8752419Sjulian */ 8852419Sjulianstatic int 8970700Sjulianngh_rcvdata(hook_p hook, item_p item) 9052419Sjulian{ 9170700Sjulian NG_FREE_ITEM(item); 9252419Sjulian return 0; 9352419Sjulian} 9452419Sjulian 9552419Sjulian/* 9652419Sjulian * Hook disconnection 9752419Sjulian */ 9852419Sjulianstatic int 9952419Sjulianngh_disconnect(hook_p hook) 10052419Sjulian{ 10152419Sjulian if (hook->node->numhooks == 0) 10270700Sjulian ng_rmnode_self(hook->node); 10352419Sjulian return (0); 10452419Sjulian} 105