xref: /linux/net/bridge/br_device.c (revision 87c2ce3b9305b9b723faeedf6e32ef703ec9b33a)
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/etherdevice.h>
19 #include <linux/ethtool.h>
20 
21 #include <asm/uaccess.h>
22 #include "br_private.h"
23 
24 static struct net_device_stats *br_dev_get_stats(struct net_device *dev)
25 {
26 	struct net_bridge *br = netdev_priv(dev);
27 	return &br->statistics;
28 }
29 
30 int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
31 {
32 	struct net_bridge *br = netdev_priv(dev);
33 	const unsigned char *dest = skb->data;
34 	struct net_bridge_fdb_entry *dst;
35 
36 	br->statistics.tx_packets++;
37 	br->statistics.tx_bytes += skb->len;
38 
39 	skb->mac.raw = skb->data;
40 	skb_pull(skb, ETH_HLEN);
41 
42 	rcu_read_lock();
43 	if (dest[0] & 1)
44 		br_flood_deliver(br, skb, 0);
45 	else if ((dst = __br_fdb_get(br, dest)) != NULL)
46 		br_deliver(dst->dst, skb);
47 	else
48 		br_flood_deliver(br, skb, 0);
49 
50 	rcu_read_unlock();
51 	return 0;
52 }
53 
54 static int br_dev_open(struct net_device *dev)
55 {
56 	struct net_bridge *br = netdev_priv(dev);
57 
58 	br_features_recompute(br);
59 	netif_start_queue(dev);
60 	br_stp_enable_bridge(br);
61 
62 	return 0;
63 }
64 
65 static void br_dev_set_multicast_list(struct net_device *dev)
66 {
67 }
68 
69 static int br_dev_stop(struct net_device *dev)
70 {
71 	br_stp_disable_bridge(netdev_priv(dev));
72 
73 	netif_stop_queue(dev);
74 
75 	return 0;
76 }
77 
78 static int br_change_mtu(struct net_device *dev, int new_mtu)
79 {
80 	if (new_mtu < 68 || new_mtu > br_min_mtu(netdev_priv(dev)))
81 		return -EINVAL;
82 
83 	dev->mtu = new_mtu;
84 	return 0;
85 }
86 
87 /* Allow setting mac address of pseudo-bridge to be same as
88  * any of the bound interfaces
89  */
90 static int br_set_mac_address(struct net_device *dev, void *p)
91 {
92 	struct net_bridge *br = netdev_priv(dev);
93 	struct sockaddr *addr = p;
94 	struct net_bridge_port *port;
95 	int err = -EADDRNOTAVAIL;
96 
97 	spin_lock_bh(&br->lock);
98 	list_for_each_entry(port, &br->port_list, list) {
99 		if (!compare_ether_addr(port->dev->dev_addr, addr->sa_data)) {
100 			br_stp_change_bridge_id(br, addr->sa_data);
101 			err = 0;
102 			break;
103 		}
104 	}
105 	spin_unlock_bh(&br->lock);
106 
107 	return err;
108 }
109 
110 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
111 {
112 	strcpy(info->driver, "bridge");
113 	strcpy(info->version, BR_VERSION);
114 	strcpy(info->fw_version, "N/A");
115 	strcpy(info->bus_info, "N/A");
116 }
117 
118 static int br_set_sg(struct net_device *dev, u32 data)
119 {
120 	struct net_bridge *br = netdev_priv(dev);
121 
122 	if (data)
123 		br->feature_mask |= NETIF_F_SG;
124 	else
125 		br->feature_mask &= ~NETIF_F_SG;
126 
127 	br_features_recompute(br);
128 	return 0;
129 }
130 
131 static int br_set_tso(struct net_device *dev, u32 data)
132 {
133 	struct net_bridge *br = netdev_priv(dev);
134 
135 	if (data)
136 		br->feature_mask |= NETIF_F_TSO;
137 	else
138 		br->feature_mask &= ~NETIF_F_TSO;
139 
140 	br_features_recompute(br);
141 	return 0;
142 }
143 
144 static int br_set_tx_csum(struct net_device *dev, u32 data)
145 {
146 	struct net_bridge *br = netdev_priv(dev);
147 
148 	if (data)
149 		br->feature_mask |= NETIF_F_IP_CSUM;
150 	else
151 		br->feature_mask &= ~NETIF_F_IP_CSUM;
152 
153 	br_features_recompute(br);
154 	return 0;
155 }
156 
157 static struct ethtool_ops br_ethtool_ops = {
158 	.get_drvinfo = br_getinfo,
159 	.get_link = ethtool_op_get_link,
160 	.get_sg = ethtool_op_get_sg,
161 	.set_sg = br_set_sg,
162 	.get_tx_csum = ethtool_op_get_tx_csum,
163 	.set_tx_csum = br_set_tx_csum,
164 	.get_tso = ethtool_op_get_tso,
165 	.set_tso = br_set_tso,
166 };
167 
168 void br_dev_setup(struct net_device *dev)
169 {
170 	memset(dev->dev_addr, 0, ETH_ALEN);
171 
172 	ether_setup(dev);
173 
174 	dev->do_ioctl = br_dev_ioctl;
175 	dev->get_stats = br_dev_get_stats;
176 	dev->hard_start_xmit = br_dev_xmit;
177 	dev->open = br_dev_open;
178 	dev->set_multicast_list = br_dev_set_multicast_list;
179 	dev->change_mtu = br_change_mtu;
180 	dev->destructor = free_netdev;
181 	SET_MODULE_OWNER(dev);
182  	SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
183 	dev->stop = br_dev_stop;
184 	dev->tx_queue_len = 0;
185 	dev->set_mac_address = br_set_mac_address;
186 	dev->priv_flags = IFF_EBRIDGE;
187 
188  	dev->features = NETIF_F_SG | NETIF_F_FRAGLIST
189  		| NETIF_F_HIGHDMA | NETIF_F_TSO | NETIF_F_IP_CSUM;
190 }
191