FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_hub.c
1 /*-
2 * Copyright (c) 2004 Ruslan Ermilov
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/sys/netgraph/ng_hub.c,v 1.3 2004/06/26 22:24:16 julian Exp $
27 */
28
29 #include <sys/param.h>
30 #include <sys/errno.h>
31 #include <sys/kernel.h>
32 #include <sys/mbuf.h>
33 #include <sys/systm.h>
34
35 #include <netgraph/ng_message.h>
36 #include <netgraph/ng_hub.h>
37 #include <netgraph/netgraph.h>
38
39 static ng_constructor_t ng_hub_constructor;
40 static ng_rcvdata_t ng_hub_rcvdata;
41 static ng_disconnect_t ng_hub_disconnect;
42
43 static struct ng_type ng_hub_typestruct = {
44 .version = NG_ABI_VERSION,
45 .name = NG_HUB_NODE_TYPE,
46 .constructor = ng_hub_constructor,
47 .rcvdata = ng_hub_rcvdata,
48 .disconnect = ng_hub_disconnect,
49 };
50 NETGRAPH_INIT(hub, &ng_hub_typestruct);
51
52
53 static int
54 ng_hub_constructor(node_p node)
55 {
56
57 return (0);
58 }
59
60 static int
61 ng_hub_rcvdata(hook_p hook, item_p item)
62 {
63 const node_p node = NG_HOOK_NODE(hook);
64 int error = 0;
65 hook_p hook2;
66 struct mbuf * const m = NGI_M(item), *m2;
67 int nhooks;
68
69 if ((nhooks = NG_NODE_NUMHOOKS(node)) == 1) {
70 NG_FREE_ITEM(item);
71 return (0);
72 }
73 LIST_FOREACH(hook2, &node->nd_hooks, hk_hooks) {
74 if (hook2 == hook)
75 continue;
76 if (--nhooks == 1)
77 NG_FWD_ITEM_HOOK(error, item, hook2);
78 else {
79 if ((m2 = m_dup(m, M_DONTWAIT)) == NULL) {
80 NG_FREE_ITEM(item);
81 return (ENOBUFS);
82 }
83 NG_SEND_DATA_ONLY(error, hook2, m2);
84 if (error)
85 continue; /* don't give up */
86 }
87 }
88
89 return (error);
90 }
91
92 static int
93 ng_hub_disconnect(hook_p hook)
94 {
95
96 if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
97 NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
98 ng_rmnode_self(NG_HOOK_NODE(hook));
99 return (0);
100 }
101
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