1/*
2 *	Device handling code
3 *	Linux ethernet bridge
4 *
5 *	Authors:
6 *	Lennert Buytenhek		<buytenh@gnu.org>
7 *
8 *	$Id: br_device.c,v 1.1.1.1 2008/10/15 03:27:33 james26_jang Exp $
9 *
10 *	This program is free software; you can redistribute it and/or
11 *	modify it under the terms of the GNU General Public License
12 *	as published by the Free Software Foundation; either version
13 *	2 of the License, or (at your option) any later version.
14 */
15
16#include <linux/kernel.h>
17#include <linux/netdevice.h>
18#include <linux/if_bridge.h>
19#include <asm/uaccess.h>
20#include "br_private.h"
21
22static int br_dev_do_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
23{
24	unsigned long args[4];
25	unsigned long *data;
26
27	if (cmd != SIOCDEVPRIVATE)
28		return -EOPNOTSUPP;
29
30	data = (unsigned long *)rq->ifr_data;
31	if (copy_from_user(args, data, 4*sizeof(unsigned long)))
32		return -EFAULT;
33
34	return br_ioctl(dev->priv, args[0], args[1], args[2], args[3]);
35}
36
37static struct net_device_stats *br_dev_get_stats(struct net_device *dev)
38{
39	struct net_bridge *br;
40
41	br = dev->priv;
42
43	return &br->statistics;
44}
45
46static int __br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
47{
48	struct net_bridge *br;
49	unsigned char *dest;
50	struct net_bridge_fdb_entry *dst;
51
52	br = dev->priv;
53	br->statistics.tx_packets++;
54	br->statistics.tx_bytes += skb->len;
55
56	dest = skb->mac.raw = skb->data;
57	skb_pull(skb, ETH_HLEN);
58
59	if (dest[0] & 1) {
60		br_flood_deliver(br, skb, 0);
61		return 0;
62	}
63
64	if ((dst = br_fdb_get(br, dest)) != NULL) {
65		br_deliver(dst->dst, skb);
66		br_fdb_put(dst);
67		return 0;
68	}
69
70	br_flood_deliver(br, skb, 0);
71	return 0;
72}
73
74int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
75{
76	struct net_bridge *br;
77	int ret;
78
79	br = dev->priv;
80	read_lock(&br->lock);
81	ret = __br_dev_xmit(skb, dev);
82	read_unlock(&br->lock);
83
84	return ret;
85}
86
87static int br_dev_open(struct net_device *dev)
88{
89	struct net_bridge *br;
90
91	netif_start_queue(dev);
92
93	br = dev->priv;
94	read_lock(&br->lock);
95	br_stp_enable_bridge(br);
96	read_unlock(&br->lock);
97
98	return 0;
99}
100
101static void br_dev_set_multicast_list(struct net_device *dev)
102{
103}
104
105static int br_dev_stop(struct net_device *dev)
106{
107	struct net_bridge *br;
108
109	br = dev->priv;
110	read_lock(&br->lock);
111	br_stp_disable_bridge(br);
112	read_unlock(&br->lock);
113
114	netif_stop_queue(dev);
115
116	return 0;
117}
118
119static int br_dev_accept_fastpath(struct net_device *dev, struct dst_entry *dst)
120{
121	return -1;
122}
123
124extern void br_stp_change_bridge_id(struct net_bridge *br, unsigned char *addr);
125
126static int
127br_set_mac_address(struct net_device *dev, void *addr)
128{
129	struct net_bridge *br = dev->priv;
130	struct sockaddr *sa = (struct sockaddr *) addr;
131
132	write_lock_bh(&br->lock);
133
134	memcpy(br->preferred_id.addr, sa->sa_data, ETH_ALEN);
135
136	br_stp_recalculate_bridge_id(br);
137
138	write_unlock_bh(&br->lock);
139
140	return 0;
141}
142
143void br_dev_setup(struct net_device *dev)
144{
145	memset(dev->dev_addr, 0, ETH_ALEN);
146
147	dev->do_ioctl = br_dev_do_ioctl;
148	dev->get_stats = br_dev_get_stats;
149	dev->hard_start_xmit = br_dev_xmit;
150	dev->open = br_dev_open;
151	dev->set_multicast_list = br_dev_set_multicast_list;
152	dev->stop = br_dev_stop;
153	dev->accept_fastpath = br_dev_accept_fastpath;
154	dev->tx_queue_len = 0;
155	dev->set_mac_address = br_set_mac_address;
156}
157