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 1.5.2.1 2001/12/24 00:59:27 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
br_dev_do_ioctl(struct net_device * dev,struct ifreq * rq,int cmd)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
br_dev_get_stats(struct net_device * dev)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
__br_dev_xmit(struct sk_buff * skb,struct net_device * dev)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->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
br_dev_xmit(struct sk_buff * skb,struct net_device * dev)74 int 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
br_dev_open(struct net_device * dev)87 static 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
br_dev_set_multicast_list(struct net_device * dev)101 static void br_dev_set_multicast_list(struct net_device *dev)
102 {
103 }
104
br_dev_stop(struct net_device * dev)105 static 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
br_dev_accept_fastpath(struct net_device * dev,struct dst_entry * dst)119 static int br_dev_accept_fastpath(struct net_device *dev, struct dst_entry *dst)
120 {
121 return -1;
122 }
123
br_dev_setup(struct net_device * dev)124 void br_dev_setup(struct net_device *dev)
125 {
126 memset(dev->dev_addr, 0, ETH_ALEN);
127
128 dev->do_ioctl = br_dev_do_ioctl;
129 dev->get_stats = br_dev_get_stats;
130 dev->hard_start_xmit = br_dev_xmit;
131 dev->open = br_dev_open;
132 dev->set_multicast_list = br_dev_set_multicast_list;
133 dev->stop = br_dev_stop;
134 dev->accept_fastpath = br_dev_accept_fastpath;
135 dev->tx_queue_len = 0;
136 dev->set_mac_address = NULL;
137 }
138