FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_hub.c
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2004 Ruslan Ermilov
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31 #include <sys/param.h>
32 #include <sys/errno.h>
33 #include <sys/kernel.h>
34 #include <sys/mbuf.h>
35 #include <sys/systm.h>
36
37 #include <netgraph/ng_message.h>
38 #include <netgraph/ng_hub.h>
39 #include <netgraph/netgraph.h>
40
41 #ifdef NG_SEPARATE_MALLOC
42 static MALLOC_DEFINE(M_NETGRAPH_HUB, "netgraph_hub", "netgraph hub node");
43 #else
44 #define M_NETGRAPH_HUB M_NETGRAPH
45 #endif
46
47 /* Per-node private data */
48 struct ng_hub_private {
49 int persistent; /* can exist w/o hooks */
50 };
51 typedef struct ng_hub_private *priv_p;
52
53 /* Netgraph node methods */
54 static ng_constructor_t ng_hub_constructor;
55 static ng_rcvmsg_t ng_hub_rcvmsg;
56 static ng_shutdown_t ng_hub_shutdown;
57 static ng_rcvdata_t ng_hub_rcvdata;
58 static ng_disconnect_t ng_hub_disconnect;
59
60 /* List of commands and how to convert arguments to/from ASCII */
61 static const struct ng_cmdlist ng_hub_cmdlist[] = {
62 {
63 NGM_HUB_COOKIE,
64 NGM_HUB_SET_PERSISTENT,
65 "setpersistent",
66 NULL,
67 NULL
68 },
69 { 0 }
70 };
71
72 static struct ng_type ng_hub_typestruct = {
73 .version = NG_ABI_VERSION,
74 .name = NG_HUB_NODE_TYPE,
75 .constructor = ng_hub_constructor,
76 .rcvmsg = ng_hub_rcvmsg,
77 .shutdown = ng_hub_shutdown,
78 .rcvdata = ng_hub_rcvdata,
79 .disconnect = ng_hub_disconnect,
80 .cmdlist = ng_hub_cmdlist,
81 };
82 NETGRAPH_INIT(hub, &ng_hub_typestruct);
83
84
85 static int
86 ng_hub_constructor(node_p node)
87 {
88 priv_p priv;
89
90 /* Allocate and initialize private info */
91 priv = malloc(sizeof(*priv), M_NETGRAPH_HUB, M_WAITOK | M_ZERO);
92
93 NG_NODE_SET_PRIVATE(node, priv);
94 return (0);
95 }
96
97 /*
98 * Receive a control message
99 */
100 static int
101 ng_hub_rcvmsg(node_p node, item_p item, hook_p lasthook)
102 {
103 const priv_p priv = NG_NODE_PRIVATE(node);
104 int error = 0;
105 struct ng_mesg *msg;
106
107 NGI_GET_MSG(item, msg);
108 if (msg->header.typecookie == NGM_HUB_COOKIE &&
109 msg->header.cmd == NGM_HUB_SET_PERSISTENT) {
110 priv->persistent = 1;
111 } else {
112 error = EINVAL;
113 }
114
115 NG_FREE_MSG(msg);
116 return (error);
117 }
118
119 static int
120 ng_hub_rcvdata(hook_p hook, item_p item)
121 {
122 const node_p node = NG_HOOK_NODE(hook);
123 int error = 0;
124 hook_p hook2;
125 struct mbuf * const m = NGI_M(item), *m2;
126 int nhooks;
127
128 if ((nhooks = NG_NODE_NUMHOOKS(node)) == 1) {
129 NG_FREE_ITEM(item);
130 return (0);
131 }
132 LIST_FOREACH(hook2, &node->nd_hooks, hk_hooks) {
133 if (hook2 == hook)
134 continue;
135 if (--nhooks == 1)
136 NG_FWD_ITEM_HOOK(error, item, hook2);
137 else {
138 if ((m2 = m_dup(m, M_NOWAIT)) == NULL) {
139 NG_FREE_ITEM(item);
140 return (ENOBUFS);
141 }
142 NG_SEND_DATA_ONLY(error, hook2, m2);
143 if (error)
144 continue; /* don't give up */
145 }
146 }
147
148 return (error);
149 }
150
151 /*
152 * Shutdown node
153 */
154 static int
155 ng_hub_shutdown(node_p node)
156 {
157 const priv_p priv = NG_NODE_PRIVATE(node);
158
159 free(priv, M_NETGRAPH_HUB);
160 NG_NODE_SET_PRIVATE(node, NULL);
161 NG_NODE_UNREF(node);
162 return (0);
163 }
164
165 static int
166 ng_hub_disconnect(hook_p hook)
167 {
168 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
169
170 if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
171 NG_NODE_IS_VALID(NG_HOOK_NODE(hook)) && !priv->persistent)
172 ng_rmnode_self(NG_HOOK_NODE(hook));
173 return (0);
174 }
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