ng_split.c revision 87599 
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: head/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 */
48static ng_constructor_t ng_split_constructor;
49static ng_shutdown_t ng_split_shutdown;
50static ng_newhook_t ng_split_newhook;
51static ng_rcvdata_t ng_split_rcvdata;
52static ng_disconnect_t ng_split_disconnect;
53
54/* Node type descriptor */
55static 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};
69NETGRAPH_INIT(ng_split, &typestruct);
70
71/* Node private data */
72struct ng_split_private {
73	hook_p out;
74	hook_p in;
75	hook_p mixed;
76	node_p	node;			/* Our netgraph node */
77};
78typedef struct ng_split_private *priv_p;
79
80/************************************************************************
81			NETGRAPH NODE STUFF
82 ************************************************************************/
83
84/*
85 * Constructor for a node
86 */
87static int
88ng_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 */
109static int
110ng_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 */
136static int
137ng_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
155static int
156ng_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 */
170static int
171ng_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}
184