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/5.0/sys/netgraph/ng_split.c 87599 2001-12-10 08:09:49Z obrien $
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 NG_ABI_VERSION,
57 NG_SPLIT_NODE_TYPE,
58 NULL,
59 ng_split_constructor,
60 NULL,
61 ng_split_shutdown,
62 ng_split_newhook,
63 NULL,
64 NULL,
65 ng_split_rcvdata,
66 ng_split_disconnect,
67 NULL
68 };
69 NETGRAPH_INIT(ng_split, &typestruct);
70
71 /* Node private data */
72 struct ng_split_private {
73 hook_p out;
74 hook_p in;
75 hook_p mixed;
76 node_p node; /* Our netgraph node */
77 };
78 typedef struct ng_split_private *priv_p;
79
80 /************************************************************************
81 NETGRAPH NODE STUFF
82 ************************************************************************/
83
84 /*
85 * Constructor for a node
86 */
87 static int
88 ng_split_constructor(node_p node)
89 {
90 priv_p priv;
91
92 /* Allocate node */
93 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_ZERO | M_NOWAIT);
94 if (priv == NULL)
95 return (ENOMEM);
96 bzero(priv, sizeof(*priv));
97
98 /* Link together node and private info */
99 NG_NODE_SET_PRIVATE(node, priv);
100 priv->node = node;
101
102 /* Done */
103 return (0);
104 }
105
106 /*
107 * Give our ok for a hook to be added
108 */
109 static int
110 ng_split_newhook(node_p node, hook_p hook, const char *name)
111 {
112 priv_p priv = NG_NODE_PRIVATE(node);
113 hook_p *localhook;
114
115 if (strcmp(name, NG_SPLIT_HOOK_MIXED) == 0) {
116 localhook = &priv->mixed;
117 } else if (strcmp(name, NG_SPLIT_HOOK_IN) == 0) {
118 localhook = &priv->in;
119 } else if (strcmp(name, NG_SPLIT_HOOK_OUT) == 0) {
120 localhook = &priv->out;
121 } else {
122 return (EPFNOSUPPORT);
123 }
124
125 if (*localhook != NULL)
126 return (EISCONN);
127 *localhook = hook;
128 NG_HOOK_SET_PRIVATE(hook, localhook);
129
130 return (0);
131 }
132
133 /*
134 * Recive data from a hook.
135 */
136 static int
137 ng_split_rcvdata(hook_p hook, item_p item)
138 {
139 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
140 int error = 0;
141
142 if (hook == priv->out) {
143 printf("ng_split: got packet from out hook!\n");
144 NG_FREE_ITEM(item);
145 error = EINVAL;
146 } else if ((hook == priv->in) && (priv->mixed != NULL)) {
147 NG_FWD_ITEM_HOOK(error, item, priv->mixed);
148 } else if ((hook == priv->mixed) && (priv->out != NULL)) {
149 NG_FWD_ITEM_HOOK(error, item, priv->out);
150 }
151
152 return (error);
153 }
154
155 static int
156 ng_split_shutdown(node_p node)
157 {
158 const priv_p priv = NG_NODE_PRIVATE(node);
159
160 NG_NODE_SET_PRIVATE(node, NULL);
161 NG_NODE_UNREF(node);
162 FREE(priv, M_NETGRAPH);
163
164 return (0);
165 }
166
167 /*
168 * Hook disconnection
169 */
170 static int
171 ng_split_disconnect(hook_p hook)
172 {
173 hook_p *localhook = NG_HOOK_PRIVATE(hook);
174
175 KASSERT(localhook != NULL, ("%s: null info", __func__));
176 *localhook = NULL;
177 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
178 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
179 ng_rmnode_self(NG_HOOK_NODE(hook));
180 }
181
182 return (0);
183 }
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