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@freebsd.org>
38 *
39 * $FreeBSD: releng/5.0/sys/netgraph/ng_hole.c 70784 2001-01-08 05:34:06Z julian $
40 * $Whistle: ng_hole.c,v 1.10 1999/11/01 09:24:51 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/kernel.h>
50 #include <sys/malloc.h>
51 #include <sys/mbuf.h>
52 #include <netgraph/ng_message.h>
53 #include <netgraph/netgraph.h>
54 #include <netgraph/ng_hole.h>
55
56 /* Netgraph methods */
57 static ng_constructor_t ngh_cons;
58 static ng_rcvdata_t ngh_rcvdata;
59 static ng_disconnect_t ngh_disconnect;
60
61 static struct ng_type typestruct = {
62 NG_ABI_VERSION,
63 NG_HOLE_NODE_TYPE,
64 NULL, /* modeventhand_t */
65 ngh_cons, /* ng_constructor_t */
66 NULL, /* ng_rcvmsg_t */
67 NULL, /* ng_shutdown_t */
68 NULL, /* ng_newhook_t */
69 NULL, /* ng_findhook_t */
70 NULL, /* ng_connect_t */
71 ngh_rcvdata, /* ng_rcvdata_t */
72 ngh_disconnect, /* ng_disconnect_t */
73 NULL /* ng_cmdlist */
74 };
75 NETGRAPH_INIT(hole, &typestruct);
76
77 /*
78 * Be obliging. but no work to do.
79 */
80 static int
81 ngh_cons(node_p node)
82 {
83 return(0);
84 }
85
86 /*
87 * Receive data
88 */
89 static int
90 ngh_rcvdata(hook_p hook, item_p item)
91 {
92 NG_FREE_ITEM(item);
93 return 0;
94 }
95
96 /*
97 * Hook disconnection
98 */
99 static int
100 ngh_disconnect(hook_p hook)
101 {
102 if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
103 ng_rmnode_self(NG_HOOK_NODE(hook));
104 return (0);
105 }
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