1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1999-2000, Vitaly V Belekhov
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 unmodified, this list of conditions, and the following
12 * disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 */
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/errno.h>
34 #include <sys/kernel.h>
35 #include <sys/malloc.h>
36 #include <sys/mbuf.h>
37 #include <sys/errno.h>
38 #include <sys/sockio.h>
39 #include <sys/socket.h>
40 #include <sys/syslog.h>
41
42 #include <netgraph/ng_message.h>
43 #include <netgraph/netgraph.h>
44 #include <netgraph/ng_split.h>
45
46 /* Netgraph methods */
47 static ng_constructor_t ng_split_constructor;
48 static ng_shutdown_t ng_split_shutdown;
49 static ng_newhook_t ng_split_newhook;
50 static ng_rcvdata_t ng_split_rcvdata;
51 static ng_disconnect_t ng_split_disconnect;
52
53 /* Node type descriptor */
54 static struct ng_type typestruct = {
55 .version = NG_ABI_VERSION,
56 .name = NG_SPLIT_NODE_TYPE,
57 .constructor = ng_split_constructor,
58 .shutdown = ng_split_shutdown,
59 .newhook = ng_split_newhook,
60 .rcvdata = ng_split_rcvdata,
61 .disconnect = ng_split_disconnect,
62 };
63 NETGRAPH_INIT(ng_split, &typestruct);
64
65 /* Node private data */
66 struct ng_split_private {
67 hook_p out;
68 hook_p in;
69 hook_p mixed;
70 node_p node; /* Our netgraph node */
71 };
72 typedef struct ng_split_private *priv_p;
73
74 /************************************************************************
75 NETGRAPH NODE STUFF
76 ************************************************************************/
77
78 /*
79 * Constructor for a node
80 */
81 static int
ng_split_constructor(node_p node)82 ng_split_constructor(node_p node)
83 {
84 priv_p priv;
85
86 /* Allocate node */
87 priv = malloc(sizeof(*priv), M_NETGRAPH, M_ZERO | M_WAITOK);
88
89 /* Link together node and private info */
90 NG_NODE_SET_PRIVATE(node, priv);
91 priv->node = node;
92
93 /* Done */
94 return (0);
95 }
96
97 /*
98 * Give our ok for a hook to be added
99 */
100 static int
ng_split_newhook(node_p node,hook_p hook,const char * name)101 ng_split_newhook(node_p node, hook_p hook, const char *name)
102 {
103 priv_p priv = NG_NODE_PRIVATE(node);
104 hook_p *localhook;
105
106 if (strcmp(name, NG_SPLIT_HOOK_MIXED) == 0) {
107 localhook = &priv->mixed;
108 } else if (strcmp(name, NG_SPLIT_HOOK_IN) == 0) {
109 localhook = &priv->in;
110 } else if (strcmp(name, NG_SPLIT_HOOK_OUT) == 0) {
111 localhook = &priv->out;
112 } else
113 return (EINVAL);
114
115 if (*localhook != NULL)
116 return (EISCONN);
117 *localhook = hook;
118 NG_HOOK_SET_PRIVATE(hook, localhook);
119
120 return (0);
121 }
122
123 /*
124 * Recive data from a hook.
125 */
126 static int
ng_split_rcvdata(hook_p hook,item_p item)127 ng_split_rcvdata(hook_p hook, item_p item)
128 {
129 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
130 int error = 0;
131
132 if (hook == priv->out) {
133 printf("ng_split: got packet from out hook!\n");
134 NG_FREE_ITEM(item);
135 error = EINVAL;
136 } else if ((hook == priv->in) && (priv->mixed != NULL)) {
137 NG_FWD_ITEM_HOOK(error, item, priv->mixed);
138 } else if ((hook == priv->mixed) && (priv->out != NULL)) {
139 NG_FWD_ITEM_HOOK(error, item, priv->out);
140 }
141
142 if (item)
143 NG_FREE_ITEM(item);
144
145 return (error);
146 }
147
148 static int
ng_split_shutdown(node_p node)149 ng_split_shutdown(node_p node)
150 {
151 const priv_p priv = NG_NODE_PRIVATE(node);
152
153 NG_NODE_SET_PRIVATE(node, NULL);
154 NG_NODE_UNREF(node);
155 free(priv, M_NETGRAPH);
156
157 return (0);
158 }
159
160 /*
161 * Hook disconnection
162 */
163 static int
ng_split_disconnect(hook_p hook)164 ng_split_disconnect(hook_p hook)
165 {
166 hook_p *localhook = NG_HOOK_PRIVATE(hook);
167
168 KASSERT(localhook != NULL, ("%s: null info", __func__));
169 *localhook = NULL;
170 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
171 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
172 ng_rmnode_self(NG_HOOK_NODE(hook));
173 }
174
175 return (0);
176 }
177