Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.git] / net / bridge / br_device.c
1 /*
2  *      Device handling code
3  *      Linux ethernet bridge
4  *
5  *      Authors:
6  *      Lennert Buytenhek               <buytenh@gnu.org>
7  *
8  *      This program is free software; you can redistribute it and/or
9  *      modify it under the terms of the GNU General Public License
10  *      as published by the Free Software Foundation; either version
11  *      2 of the License, or (at your option) any later version.
12  */
13
14 #include <linux/kernel.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/ethtool.h>
18
19 #include <asm/uaccess.h>
20 #include "br_private.h"
21
22 /* net device transmit always called with no BH (preempt_disabled) */
23 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
24 {
25         struct net_bridge *br = netdev_priv(dev);
26         const unsigned char *dest = skb->data;
27         struct net_bridge_fdb_entry *dst;
28         struct net_bridge_mdb_entry *mdst;
29
30         BR_INPUT_SKB_CB(skb)->brdev = dev;
31
32         dev->stats.tx_packets++;
33         dev->stats.tx_bytes += skb->len;
34
35         skb_reset_mac_header(skb);
36         skb_pull(skb, ETH_HLEN);
37
38         if (dest[0] & 1) {
39                 if (br_multicast_rcv(br, NULL, skb))
40                         goto out;
41
42                 mdst = br_mdb_get(br, skb);
43                 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
44                         br_multicast_deliver(mdst, skb);
45                 else
46                         br_flood_deliver(br, skb);
47         } else if ((dst = __br_fdb_get(br, dest)) != NULL)
48                 br_deliver(dst->dst, skb);
49         else
50                 br_flood_deliver(br, skb);
51
52 out:
53         return NETDEV_TX_OK;
54 }
55
56 static int br_dev_open(struct net_device *dev)
57 {
58         struct net_bridge *br = netdev_priv(dev);
59
60         br_features_recompute(br);
61         netif_start_queue(dev);
62         br_stp_enable_bridge(br);
63         br_multicast_open(br);
64
65         return 0;
66 }
67
68 static void br_dev_set_multicast_list(struct net_device *dev)
69 {
70 }
71
72 static int br_dev_stop(struct net_device *dev)
73 {
74         struct net_bridge *br = netdev_priv(dev);
75
76         br_stp_disable_bridge(br);
77         br_multicast_stop(br);
78
79         netif_stop_queue(dev);
80
81         return 0;
82 }
83
84 static int br_change_mtu(struct net_device *dev, int new_mtu)
85 {
86         struct net_bridge *br = netdev_priv(dev);
87         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
88                 return -EINVAL;
89
90         dev->mtu = new_mtu;
91
92 #ifdef CONFIG_BRIDGE_NETFILTER
93         /* remember the MTU in the rtable for PMTU */
94         br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
95 #endif
96
97         return 0;
98 }
99
100 /* Allow setting mac address to any valid ethernet address. */
101 static int br_set_mac_address(struct net_device *dev, void *p)
102 {
103         struct net_bridge *br = netdev_priv(dev);
104         struct sockaddr *addr = p;
105
106         if (!is_valid_ether_addr(addr->sa_data))
107                 return -EINVAL;
108
109         spin_lock_bh(&br->lock);
110         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
111         br_stp_change_bridge_id(br, addr->sa_data);
112         br->flags |= BR_SET_MAC_ADDR;
113         spin_unlock_bh(&br->lock);
114
115         return 0;
116 }
117
118 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
119 {
120         strcpy(info->driver, "bridge");
121         strcpy(info->version, BR_VERSION);
122         strcpy(info->fw_version, "N/A");
123         strcpy(info->bus_info, "N/A");
124 }
125
126 static int br_set_sg(struct net_device *dev, u32 data)
127 {
128         struct net_bridge *br = netdev_priv(dev);
129
130         if (data)
131                 br->feature_mask |= NETIF_F_SG;
132         else
133                 br->feature_mask &= ~NETIF_F_SG;
134
135         br_features_recompute(br);
136         return 0;
137 }
138
139 static int br_set_tso(struct net_device *dev, u32 data)
140 {
141         struct net_bridge *br = netdev_priv(dev);
142
143         if (data)
144                 br->feature_mask |= NETIF_F_TSO;
145         else
146                 br->feature_mask &= ~NETIF_F_TSO;
147
148         br_features_recompute(br);
149         return 0;
150 }
151
152 static int br_set_tx_csum(struct net_device *dev, u32 data)
153 {
154         struct net_bridge *br = netdev_priv(dev);
155
156         if (data)
157                 br->feature_mask |= NETIF_F_NO_CSUM;
158         else
159                 br->feature_mask &= ~NETIF_F_ALL_CSUM;
160
161         br_features_recompute(br);
162         return 0;
163 }
164
165 static const struct ethtool_ops br_ethtool_ops = {
166         .get_drvinfo    = br_getinfo,
167         .get_link       = ethtool_op_get_link,
168         .get_tx_csum    = ethtool_op_get_tx_csum,
169         .set_tx_csum    = br_set_tx_csum,
170         .get_sg         = ethtool_op_get_sg,
171         .set_sg         = br_set_sg,
172         .get_tso        = ethtool_op_get_tso,
173         .set_tso        = br_set_tso,
174         .get_ufo        = ethtool_op_get_ufo,
175         .set_ufo        = ethtool_op_set_ufo,
176         .get_flags      = ethtool_op_get_flags,
177 };
178
179 static const struct net_device_ops br_netdev_ops = {
180         .ndo_open                = br_dev_open,
181         .ndo_stop                = br_dev_stop,
182         .ndo_start_xmit          = br_dev_xmit,
183         .ndo_set_mac_address     = br_set_mac_address,
184         .ndo_set_multicast_list  = br_dev_set_multicast_list,
185         .ndo_change_mtu          = br_change_mtu,
186         .ndo_do_ioctl            = br_dev_ioctl,
187 };
188
189 void br_dev_setup(struct net_device *dev)
190 {
191         random_ether_addr(dev->dev_addr);
192         ether_setup(dev);
193
194         dev->netdev_ops = &br_netdev_ops;
195         dev->destructor = free_netdev;
196         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
197         dev->tx_queue_len = 0;
198         dev->priv_flags = IFF_EBRIDGE;
199
200         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
201                         NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
202                         NETIF_F_NETNS_LOCAL | NETIF_F_GSO;
203 }