tjh.dev
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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 1.6 2001/12/24 00:59:55 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/module.h>
19#include <asm/uaccess.h>
20#include "br_private.h"
21
22static struct net_device_stats *br_dev_get_stats(struct net_device *dev)
23{
24 struct net_bridge *br = netdev_priv(dev);
25 return &br->statistics;
26}
27
28int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
29{
30 struct net_bridge *br = netdev_priv(dev);
31 const unsigned char *dest = skb->data;
32 struct net_bridge_fdb_entry *dst;
33
34 br->statistics.tx_packets++;
35 br->statistics.tx_bytes += skb->len;
36
37 skb->mac.raw = skb->data;
38 skb_pull(skb, ETH_HLEN);
39
40 rcu_read_lock();
41 if (dest[0] & 1)
42 br_flood_deliver(br, skb, 0);
43 else if ((dst = __br_fdb_get(br, dest)) != NULL)
44 br_deliver(dst->dst, skb);
45 else
46 br_flood_deliver(br, skb, 0);
47
48 rcu_read_unlock();
49 return 0;
50}
51
52static int br_dev_open(struct net_device *dev)
53{
54 struct net_bridge *br = netdev_priv(dev);
55
56 br_features_recompute(br);
57 netif_start_queue(dev);
58 br_stp_enable_bridge(br);
59
60 return 0;
61}
62
63static void br_dev_set_multicast_list(struct net_device *dev)
64{
65}
66
67static int br_dev_stop(struct net_device *dev)
68{
69 br_stp_disable_bridge(netdev_priv(dev));
70
71 netif_stop_queue(dev);
72
73 return 0;
74}
75
76static int br_change_mtu(struct net_device *dev, int new_mtu)
77{
78 if (new_mtu < 68 || new_mtu > br_min_mtu(netdev_priv(dev)))
79 return -EINVAL;
80
81 dev->mtu = new_mtu;
82 return 0;
83}
84
85void br_dev_setup(struct net_device *dev)
86{
87 memset(dev->dev_addr, 0, ETH_ALEN);
88
89 ether_setup(dev);
90
91 dev->do_ioctl = br_dev_ioctl;
92 dev->get_stats = br_dev_get_stats;
93 dev->hard_start_xmit = br_dev_xmit;
94 dev->open = br_dev_open;
95 dev->set_multicast_list = br_dev_set_multicast_list;
96 dev->change_mtu = br_change_mtu;
97 dev->destructor = free_netdev;
98 SET_MODULE_OWNER(dev);
99 dev->stop = br_dev_stop;
100 dev->tx_queue_len = 0;
101 dev->set_mac_address = NULL;
102 dev->priv_flags = IFF_EBRIDGE;
103}