1
2 /*
3 * ng_echo.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/5.1/sys/netgraph/ng_echo.c 70784 2001-01-08 05:34:06Z julian $
40 * $Whistle: ng_echo.c,v 1.13 1999/11/01 09:24:51 julian Exp $
41 */
42
43 /*
44 * Netgraph "echo" node
45 *
46 * This node simply bounces data and messages back to whence they came.
47 */
48
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/kernel.h>
52 #include <sys/malloc.h>
53 #include <sys/mbuf.h>
54 #include <netgraph/ng_message.h>
55 #include <netgraph/netgraph.h>
56 #include <netgraph/ng_echo.h>
57
58 /* Netgraph methods */
59 static ng_constructor_t nge_cons;
60 static ng_rcvmsg_t nge_rcvmsg;
61 static ng_rcvdata_t nge_rcvdata;
62 static ng_disconnect_t nge_disconnect;
63
64 /* Netgraph type */
65 static struct ng_type typestruct = {
66 NG_ABI_VERSION,
67 NG_ECHO_NODE_TYPE,
68 NULL,
69 nge_cons,
70 nge_rcvmsg,
71 NULL,
72 NULL,
73 NULL,
74 NULL,
75 nge_rcvdata,
76 nge_disconnect,
77 NULL
78 };
79 NETGRAPH_INIT(echo, &typestruct);
80
81 static int
82 nge_cons(node_p node)
83 {
84 return (0);
85 }
86
87 /*
88 * Receive control message. We just bounce it back as a reply.
89 */
90 static int
91 nge_rcvmsg(node_p node, item_p item, hook_p lasthook)
92 {
93 struct ng_mesg *msg;
94 int error = 0;
95
96 NGI_GET_MSG(item, msg);
97 msg->header.flags |= NGF_RESP;
98 NG_RESPOND_MSG(error, node, item, msg);
99 return (error);
100 }
101
102 /*
103 * Receive data
104 */
105 static int
106 nge_rcvdata(hook_p hook, item_p item)
107 {
108 int error = 0;
109
110 NG_FWD_ITEM_HOOK(error, item, hook);
111 return (0);
112 }
113
114 /*
115 * Removal of the last link destroys the nodeo
116 */
117 static int
118 nge_disconnect(hook_p hook)
119 {
120 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
121 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
122 ng_rmnode_self(NG_HOOK_NODE(hook));
123 }
124 return (0);
125 }
126
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