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: src/sys/netgraph/ng_split.c,v 1.7 2005/08/29 13:47:08 glebius Exp $
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/sockio.h>
38 #include <sys/socket.h>
39 #include <sys/syslog.h>
40
41 #include "ng_message.h"
42 #include "netgraph.h"
43 #include "ng_split.h"
44
45 /* Netgraph methods */
46 static ng_constructor_t ng_split_constructor;
47 static ng_shutdown_t ng_split_shutdown;
48 static ng_newhook_t ng_split_newhook;
49 static ng_rcvdata_t ng_split_rcvdata;
50 static ng_disconnect_t ng_split_disconnect;
51
52 /* Node type descriptor */
53 static struct ng_type typestruct = {
54 .version = NG_ABI_VERSION,
55 .name = NG_SPLIT_NODE_TYPE,
56 .constructor = ng_split_constructor,
57 .shutdown = ng_split_shutdown,
58 .newhook = ng_split_newhook,
59 .rcvdata = ng_split_rcvdata,
60 .disconnect = ng_split_disconnect,
61 };
62 NETGRAPH_INIT(ng_split, &typestruct);
63
64 /* Node private data */
65 struct ng_split_private {
66 hook_p out;
67 hook_p in;
68 hook_p mixed;
69 node_p node; /* Our netgraph node */
70 };
71 typedef struct ng_split_private *priv_p;
72
73 /************************************************************************
74 NETGRAPH NODE STUFF
75 ************************************************************************/
76
77 /*
78 * Constructor for a node
79 */
80 static int
ng_split_constructor(node_p node)81 ng_split_constructor(node_p node)
82 {
83 priv_p priv;
84
85 /* Allocate node */
86 priv = kmalloc(sizeof(*priv), M_NETGRAPH,
87 M_ZERO | M_WAITOK | M_NULLOK);
88 if (priv == NULL)
89 return (ENOMEM);
90
91 /* Link together node and private info */
92 NG_NODE_SET_PRIVATE(node, priv);
93 priv->node = node;
94
95 /* Done */
96 return (0);
97 }
98
99 /*
100 * Give our ok for a hook to be added
101 */
102 static int
ng_split_newhook(node_p node,hook_p hook,const char * name)103 ng_split_newhook(node_p node, hook_p hook, const char *name)
104 {
105 priv_p priv = NG_NODE_PRIVATE(node);
106 hook_p *localhook;
107
108 if (strcmp(name, NG_SPLIT_HOOK_MIXED) == 0) {
109 localhook = &priv->mixed;
110 } else if (strcmp(name, NG_SPLIT_HOOK_IN) == 0) {
111 localhook = &priv->in;
112 } else if (strcmp(name, NG_SPLIT_HOOK_OUT) == 0) {
113 localhook = &priv->out;
114 } else
115 return (EINVAL);
116
117 if (*localhook != NULL)
118 return (EISCONN);
119 *localhook = hook;
120 NG_HOOK_SET_PRIVATE(hook, localhook);
121
122 return (0);
123 }
124
125 /*
126 * Recive data from a hook.
127 */
128 static int
ng_split_rcvdata(hook_p hook,item_p item)129 ng_split_rcvdata(hook_p hook, item_p item)
130 {
131 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
132 int error = 0;
133
134 if (hook == priv->out) {
135 kprintf("ng_split: got packet from out hook!\n");
136 NG_FREE_ITEM(item);
137 error = EINVAL;
138 } else if ((hook == priv->in) && (priv->mixed != NULL)) {
139 NG_FWD_ITEM_HOOK(error, item, priv->mixed);
140 } else if ((hook == priv->mixed) && (priv->out != NULL)) {
141 NG_FWD_ITEM_HOOK(error, item, priv->out);
142 }
143
144 if (item)
145 NG_FREE_ITEM(item);
146
147 return (error);
148 }
149
150 static int
ng_split_shutdown(node_p node)151 ng_split_shutdown(node_p node)
152 {
153 const priv_p priv = NG_NODE_PRIVATE(node);
154
155 NG_NODE_SET_PRIVATE(node, NULL);
156 NG_NODE_UNREF(node);
157 kfree(priv, M_NETGRAPH);
158
159 return (0);
160 }
161
162 /*
163 * Hook disconnection
164 */
165 static int
ng_split_disconnect(hook_p hook)166 ng_split_disconnect(hook_p hook)
167 {
168 hook_p *localhook = NG_HOOK_PRIVATE(hook);
169
170 KASSERT(localhook != NULL, ("%s: null info", __func__));
171 *localhook = NULL;
172 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
173 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
174 ng_rmnode_self(NG_HOOK_NODE(hook));
175 }
176
177 return (0);
178 }
179