1 /*-
2 *
3 * Copyright (c) 1999-2000, Vitaly V Belekhov
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice unmodified, this list of conditions, and the following
11 * 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: releng/8.0/sys/netgraph/ng_split.c 184205 2008-10-23 15:53:51Z des $
29 *
30 */
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/errno.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/mbuf.h>
38 #include <sys/errno.h>
39 #include <sys/sockio.h>
40 #include <sys/socket.h>
41 #include <sys/syslog.h>
42
43 #include <netgraph/ng_message.h>
44 #include <netgraph/netgraph.h>
45 #include <netgraph/ng_split.h>
46
47 /* Netgraph methods */
48 static ng_constructor_t ng_split_constructor;
49 static ng_shutdown_t ng_split_shutdown;
50 static ng_newhook_t ng_split_newhook;
51 static ng_rcvdata_t ng_split_rcvdata;
52 static ng_disconnect_t ng_split_disconnect;
53
54 /* Node type descriptor */
55 static struct ng_type typestruct = {
56 .version = NG_ABI_VERSION,
57 .name = NG_SPLIT_NODE_TYPE,
58 .constructor = ng_split_constructor,
59 .shutdown = ng_split_shutdown,
60 .newhook = ng_split_newhook,
61 .rcvdata = ng_split_rcvdata,
62 .disconnect = ng_split_disconnect,
63 };
64 NETGRAPH_INIT(ng_split, &typestruct);
65
66 /* Node private data */
67 struct ng_split_private {
68 hook_p out;
69 hook_p in;
70 hook_p mixed;
71 node_p node; /* Our netgraph node */
72 };
73 typedef struct ng_split_private *priv_p;
74
75 /************************************************************************
76 NETGRAPH NODE STUFF
77 ************************************************************************/
78
79 /*
80 * Constructor for a node
81 */
82 static int
83 ng_split_constructor(node_p node)
84 {
85 priv_p priv;
86
87 /* Allocate node */
88 priv = malloc(sizeof(*priv), M_NETGRAPH, M_ZERO | M_NOWAIT);
89 if (priv == NULL)
90 return (ENOMEM);
91
92 /* Link together node and private info */
93 NG_NODE_SET_PRIVATE(node, priv);
94 priv->node = node;
95
96 /* Done */
97 return (0);
98 }
99
100 /*
101 * Give our ok for a hook to be added
102 */
103 static int
104 ng_split_newhook(node_p node, hook_p hook, const char *name)
105 {
106 priv_p priv = NG_NODE_PRIVATE(node);
107 hook_p *localhook;
108
109 if (strcmp(name, NG_SPLIT_HOOK_MIXED) == 0) {
110 localhook = &priv->mixed;
111 } else if (strcmp(name, NG_SPLIT_HOOK_IN) == 0) {
112 localhook = &priv->in;
113 } else if (strcmp(name, NG_SPLIT_HOOK_OUT) == 0) {
114 localhook = &priv->out;
115 } else
116 return (EINVAL);
117
118 if (*localhook != NULL)
119 return (EISCONN);
120 *localhook = hook;
121 NG_HOOK_SET_PRIVATE(hook, localhook);
122
123 return (0);
124 }
125
126 /*
127 * Recive data from a hook.
128 */
129 static int
130 ng_split_rcvdata(hook_p hook, item_p item)
131 {
132 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
133 int error = 0;
134
135 if (hook == priv->out) {
136 printf("ng_split: got packet from out hook!\n");
137 NG_FREE_ITEM(item);
138 error = EINVAL;
139 } else if ((hook == priv->in) && (priv->mixed != NULL)) {
140 NG_FWD_ITEM_HOOK(error, item, priv->mixed);
141 } else if ((hook == priv->mixed) && (priv->out != NULL)) {
142 NG_FWD_ITEM_HOOK(error, item, priv->out);
143 }
144
145 if (item)
146 NG_FREE_ITEM(item);
147
148 return (error);
149 }
150
151 static int
152 ng_split_shutdown(node_p node)
153 {
154 const priv_p priv = NG_NODE_PRIVATE(node);
155
156 NG_NODE_SET_PRIVATE(node, NULL);
157 NG_NODE_UNREF(node);
158 free(priv, M_NETGRAPH);
159
160 return (0);
161 }
162
163 /*
164 * Hook disconnection
165 */
166 static int
167 ng_split_disconnect(hook_p hook)
168 {
169 hook_p *localhook = NG_HOOK_PRIVATE(hook);
170
171 KASSERT(localhook != NULL, ("%s: null info", __func__));
172 *localhook = NULL;
173 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
174 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
175 ng_rmnode_self(NG_HOOK_NODE(hook));
176 }
177
178 return (0);
179 }
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