1 /*
2 * ng_echo.c
3 */
4
5 /*-
6 * Copyright (c) 1996-1999 Whistle Communications, Inc.
7 * All rights reserved.
8 *
9 * Subject to the following obligations and disclaimer of warranty, use and
10 * redistribution of this software, in source or object code forms, with or
11 * without modifications are expressly permitted by Whistle Communications;
12 * provided, however, that:
13 * 1. Any and all reproductions of the source or object code must include the
14 * copyright notice above and the following disclaimer of warranties; and
15 * 2. No rights are granted, in any manner or form, to use Whistle
16 * Communications, Inc. trademarks, including the mark "WHISTLE
17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
18 * such appears in the above copyright notice or in the software.
19 *
20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
36 * OF SUCH DAMAGE.
37 *
38 * Author: Julian Elisher <julian@freebsd.org>
39 *
40 * $FreeBSD: src/sys/netgraph/ng_echo.c,v 1.13 2005/04/15 10:14:00 glebius Exp $
41 * $Whistle: ng_echo.c,v 1.13 1999/11/01 09:24:51 julian Exp $
42 */
43
44 /*
45 * Netgraph "echo" node
46 *
47 * This node simply bounces data and messages back to whence they came.
48 */
49
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/kernel.h>
53 #include <sys/malloc.h>
54 #include <sys/mbuf.h>
55 #include <netgraph/ng_message.h>
56 #include <netgraph/netgraph.h>
57 #include <netgraph/ng_echo.h>
58
59 /* Netgraph methods */
60 static ng_constructor_t nge_cons;
61 static ng_rcvmsg_t nge_rcvmsg;
62 static ng_rcvdata_t nge_rcvdata;
63 static ng_disconnect_t nge_disconnect;
64
65 /* Netgraph type */
66 static struct ng_type typestruct = {
67 .version = NG_ABI_VERSION,
68 .name = NG_ECHO_NODE_TYPE,
69 .constructor = nge_cons,
70 .rcvmsg = nge_rcvmsg,
71 .rcvdata = nge_rcvdata,
72 .disconnect = nge_disconnect,
73 };
74 NETGRAPH_INIT(echo, &typestruct);
75
76 static int
77 nge_cons(node_p node)
78 {
79 return (0);
80 }
81
82 /*
83 * Receive control message. We just bounce it back as a reply.
84 */
85 static int
86 nge_rcvmsg(node_p node, item_p item, hook_p lasthook)
87 {
88 struct ng_mesg *msg;
89 int error = 0;
90
91 NGI_GET_MSG(item, msg);
92 msg->header.flags |= NGF_RESP;
93 NG_RESPOND_MSG(error, node, item, msg);
94 return (error);
95 }
96
97 /*
98 * Receive data
99 */
100 static int
101 nge_rcvdata(hook_p hook, item_p item)
102 {
103 int error;
104
105 NG_FWD_ITEM_HOOK(error, item, hook);
106 return (error);
107 }
108
109 /*
110 * Removal of the last link destroys the nodeo
111 */
112 static int
113 nge_disconnect(hook_p hook)
114 {
115 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
116 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
117 ng_rmnode_self(NG_HOOK_NODE(hook));
118 }
119 return (0);
120 }
121
122
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