1/*-
2 * Copyright (c) 2004 Ruslan Ermilov
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29#include <sys/param.h>
30#include <sys/errno.h>
31#include <sys/kernel.h>
32#include <sys/mbuf.h>
33#include <sys/systm.h>
34
35#include <netgraph/ng_message.h>
36#include <netgraph/ng_hub.h>
37#include <netgraph/netgraph.h>
38
39#ifdef NG_SEPARATE_MALLOC
40static MALLOC_DEFINE(M_NETGRAPH_HUB, "netgraph_hub", "netgraph hub node");
41#else
42#define M_NETGRAPH_HUB M_NETGRAPH
43#endif
44
45/* Per-node private data */
46struct ng_hub_private {
47	int		persistent;	/* can exist w/o hooks */
48};
49typedef struct ng_hub_private *priv_p;
50
51/* Netgraph node methods */
52static ng_constructor_t	ng_hub_constructor;
53static ng_rcvmsg_t	ng_hub_rcvmsg;
54static ng_shutdown_t	ng_hub_shutdown;
55static ng_rcvdata_t	ng_hub_rcvdata;
56static ng_disconnect_t	ng_hub_disconnect;
57
58/* List of commands and how to convert arguments to/from ASCII */
59static const struct ng_cmdlist ng_hub_cmdlist[] = {
60	{
61		NGM_HUB_COOKIE,
62		NGM_HUB_SET_PERSISTENT,
63		"setpersistent",
64		NULL,
65		NULL
66	},
67	{ 0 }
68};
69
70static struct ng_type ng_hub_typestruct = {
71	.version =	NG_ABI_VERSION,
72	.name =		NG_HUB_NODE_TYPE,
73	.constructor =	ng_hub_constructor,
74	.rcvmsg =	ng_hub_rcvmsg,
75	.shutdown =	ng_hub_shutdown,
76	.rcvdata =	ng_hub_rcvdata,
77	.disconnect =	ng_hub_disconnect,
78	.cmdlist =	ng_hub_cmdlist,
79};
80NETGRAPH_INIT(hub, &ng_hub_typestruct);
81
82
83static int
84ng_hub_constructor(node_p node)
85{
86	priv_p priv;
87
88	/* Allocate and initialize private info */
89	priv = malloc(sizeof(*priv), M_NETGRAPH_HUB, M_WAITOK | M_ZERO);
90
91	NG_NODE_SET_PRIVATE(node, priv);
92	return (0);
93}
94
95/*
96 * Receive a control message
97 */
98static int
99ng_hub_rcvmsg(node_p node, item_p item, hook_p lasthook)
100{
101	const priv_p priv = NG_NODE_PRIVATE(node);
102	int error = 0;
103	struct ng_mesg *msg;
104
105	NGI_GET_MSG(item, msg);
106	if (msg->header.typecookie == NGM_HUB_COOKIE &&
107	    msg->header.cmd == NGM_HUB_SET_PERSISTENT) {
108		priv->persistent = 1;
109	} else {
110		error = EINVAL;
111	}
112
113	NG_FREE_MSG(msg);
114	return (error);
115}
116
117static int
118ng_hub_rcvdata(hook_p hook, item_p item)
119{
120	const node_p node = NG_HOOK_NODE(hook);
121	int error = 0;
122	hook_p hook2;
123	struct mbuf * const m = NGI_M(item), *m2;
124	int nhooks;
125
126	if ((nhooks = NG_NODE_NUMHOOKS(node)) == 1) {
127		NG_FREE_ITEM(item);
128		return (0);
129	}
130	LIST_FOREACH(hook2, &node->nd_hooks, hk_hooks) {
131		if (hook2 == hook)
132			continue;
133		if (--nhooks == 1)
134			NG_FWD_ITEM_HOOK(error, item, hook2);
135		else {
136			if ((m2 = m_dup(m, M_NOWAIT)) == NULL) {
137				NG_FREE_ITEM(item);
138				return (ENOBUFS);
139			}
140			NG_SEND_DATA_ONLY(error, hook2, m2);
141			if (error)
142				continue;	/* don't give up */
143		}
144	}
145
146	return (error);
147}
148
149/*
150 * Shutdown node
151 */
152static int
153ng_hub_shutdown(node_p node)
154{
155	const priv_p priv = NG_NODE_PRIVATE(node);
156
157	free(priv, M_NETGRAPH_HUB);
158	NG_NODE_SET_PRIVATE(node, NULL);
159	NG_NODE_UNREF(node);
160	return (0);
161}
162
163static int
164ng_hub_disconnect(hook_p hook)
165{
166	const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
167
168	if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
169	    NG_NODE_IS_VALID(NG_HOOK_NODE(hook)) && !priv->persistent)
170		ng_rmnode_self(NG_HOOK_NODE(hook));
171	return (0);
172}
173