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 1.3 2000/03/01 02:58:09 davem 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
22 static 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
37 static 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
46 static 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->data;
57
58 if (dest[0] & 1) {
59 br_flood(br, skb, 0);
60 return 0;
61 }
62
63 if ((dst = br_fdb_get(br, dest)) != NULL) {
64 br_forward(dst->dst, skb);
65 br_fdb_put(dst);
66 return 0;
67 }
68
69 br_flood(br, skb, 0);
70 return 0;
71 }
72
73 static int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
74 {
75 struct net_bridge *br;
76 int ret;
77
78 br = dev->priv;
79 read_lock(&br->lock);
80 ret = __br_dev_xmit(skb, dev);
81 read_unlock(&br->lock);
82
83 return ret;
84 }
85
86 static int br_dev_open(struct net_device *dev)
87 {
88 struct net_bridge *br;
89
90 netif_start_queue(dev);
91
92 br = dev->priv;
93 read_lock(&br->lock);
94 br_stp_enable_bridge(br);
95 read_unlock(&br->lock);
96
97 return 0;
98 }
99
100 static void br_dev_set_multicast_list(struct net_device *dev)
101 {
102 }
103
104 static int br_dev_stop(struct net_device *dev)
105 {
106 struct net_bridge *br;
107
108 br = dev->priv;
109 read_lock(&br->lock);
110 br_stp_disable_bridge(br);
111 read_unlock(&br->lock);
112
113 netif_stop_queue(dev);
114
115 return 0;
116 }
117
118 static int br_dev_accept_fastpath(struct net_device *dev, struct dst_entry *dst)
119 {
120 return -1;
121 }
122
123 void br_dev_setup(struct net_device *dev)
124 {
125 memset(dev->dev_addr, 0, ETH_ALEN);
126
127 dev->do_ioctl = br_dev_do_ioctl;
128 dev->get_stats = br_dev_get_stats;
129 dev->hard_start_xmit = br_dev_xmit;
130 dev->open = br_dev_open;
131 dev->set_multicast_list = br_dev_set_multicast_list;
132 dev->stop = br_dev_stop;
133 dev->accept_fastpath = br_dev_accept_fastpath;
134 dev->tx_queue_len = 0;
135 dev->set_mac_address = NULL;
136 }
137
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