ng_split.c revision 141502 
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 141502 2005-02-08 10:31:55Z ru $
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	.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};
64NETGRAPH_INIT(ng_split, &typestruct);
65
66/* Node private data */
67struct ng_split_private {
68	hook_p out;
69	hook_p in;
70	hook_p mixed;
71	node_p	node;			/* Our netgraph node */
72};
73typedef struct ng_split_private *priv_p;
74
75/************************************************************************
76			NETGRAPH NODE STUFF
77 ************************************************************************/
78
79/*
80 * Constructor for a node
81 */
82static int
83ng_split_constructor(node_p node)
84{
85	priv_p		priv;
86
87	/* Allocate node */
88	MALLOC(priv, priv_p, 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 */
103static int
104ng_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 (EPFNOSUPPORT);
117	}
118
119	if (*localhook != NULL)
120		return (EISCONN);
121	*localhook = hook;
122	NG_HOOK_SET_PRIVATE(hook, localhook);
123
124	return (0);
125}
126
127/*
128 * Recive data from a hook.
129 */
130static int
131ng_split_rcvdata(hook_p hook, item_p item)
132{
133	const priv_p	priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
134	int		error = 0;
135
136	if (hook == priv->out) {
137		printf("ng_split: got packet from out hook!\n");
138		NG_FREE_ITEM(item);
139		error = EINVAL;
140	} else if ((hook == priv->in) && (priv->mixed != NULL)) {
141		NG_FWD_ITEM_HOOK(error, item, priv->mixed);
142	} else if ((hook == priv->mixed) && (priv->out != NULL)) {
143		NG_FWD_ITEM_HOOK(error, item, priv->out);
144	}
145
146	return (error);
147}
148
149static int
150ng_split_shutdown(node_p node)
151{
152	const priv_p	priv = NG_NODE_PRIVATE(node);
153
154	NG_NODE_SET_PRIVATE(node, NULL);
155	NG_NODE_UNREF(node);
156	FREE(priv, M_NETGRAPH);
157
158	return (0);
159}
160
161/*
162 * Hook disconnection
163 */
164static int
165ng_split_disconnect(hook_p hook)
166{
167	hook_p		*localhook = NG_HOOK_PRIVATE(hook);
168
169	KASSERT(localhook != NULL, ("%s: null info", __func__));
170	*localhook = NULL;
171	if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
172	    && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
173		ng_rmnode_self(NG_HOOK_NODE(hook));
174	}
175
176	return (0);
177}
178