ng_hole.c revision 52419
1 2/* 3 * ng_hole.c 4 * 5 * Copyright (c) 1996-1999 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Author: Julian Elisher <julian@whistle.com> 38 * 39 * $FreeBSD: head/sys/netgraph/ng_hole.c 52419 1999-10-21 09:06:11Z julian $ 40 * $Whistle: ng_hole.c,v 1.8 1999/01/28 23:54:53 julian Exp $ 41 */ 42 43/* 44 * This node is a 'black hole' that simply discards everything it receives 45 */ 46 47#include <sys/param.h> 48#include <sys/systm.h> 49#include <sys/errno.h> 50#include <sys/kernel.h> 51#include <sys/malloc.h> 52#include <sys/mbuf.h> 53#include <sys/syslog.h> 54#include <netgraph/ng_message.h> 55#include <netgraph/netgraph.h> 56#include <netgraph/ng_hole.h> 57 58/* Netgraph methods */ 59static int ngh_rcvdata(hook_p hook, struct mbuf *m, meta_p meta); 60static int ngh_disconnect(hook_p hook); 61 62static struct ng_type typestruct = { 63 NG_VERSION, 64 NG_HOLE_NODE_TYPE, 65 NULL, 66 NULL, 67 NULL, 68 NULL, 69 NULL, 70 NULL, 71 NULL, 72 ngh_rcvdata, 73 ngh_rcvdata, 74 ngh_disconnect 75}; 76NETGRAPH_INIT(hole, &typestruct); 77 78/* 79 * Receive data 80 */ 81static int 82ngh_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 83{ 84 NG_FREE_DATA(m, meta); 85 return 0; 86} 87 88/* 89 * Hook disconnection 90 */ 91static int 92ngh_disconnect(hook_p hook) 93{ 94 if (hook->node->numhooks == 0) 95 ng_rmnode(hook->node); 96 return (0); 97} 98