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[net-next-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         struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);
30
31         brstats->tx_packets++;
32         brstats->tx_bytes += skb->len;
33
34         BR_INPUT_SKB_CB(skb)->brdev = dev;
35
36         skb_reset_mac_header(skb);
37         skb_pull(skb, ETH_HLEN);
38
39         if (dest[0] & 1) {
40                 if (br_multicast_rcv(br, NULL, skb))
41                         goto out;
42
43                 mdst = br_mdb_get(br, skb);
44                 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
45                         br_multicast_deliver(mdst, skb);
46                 else
47                         br_flood_deliver(br, skb);
48         } else if ((dst = __br_fdb_get(br, dest)) != NULL)
49                 br_deliver(dst->dst, skb);
50         else
51                 br_flood_deliver(br, skb);
52
53 out:
54         return NETDEV_TX_OK;
55 }
56
57 static int br_dev_open(struct net_device *dev)
58 {
59         struct net_bridge *br = netdev_priv(dev);
60
61         br_features_recompute(br);
62         netif_start_queue(dev);
63         br_stp_enable_bridge(br);
64         br_multicast_open(br);
65
66         return 0;
67 }
68
69 static void br_dev_set_multicast_list(struct net_device *dev)
70 {
71 }
72
73 static int br_dev_stop(struct net_device *dev)
74 {
75         struct net_bridge *br = netdev_priv(dev);
76
77         br_stp_disable_bridge(br);
78         br_multicast_stop(br);
79
80         netif_stop_queue(dev);
81
82         return 0;
83 }
84
85 static struct net_device_stats *br_get_stats(struct net_device *dev)
86 {
87         struct net_bridge *br = netdev_priv(dev);
88         struct net_device_stats *stats = &dev->stats;
89         struct br_cpu_netstats sum = { 0 };
90         unsigned int cpu;
91
92         for_each_possible_cpu(cpu) {
93                 const struct br_cpu_netstats *bstats
94                         = per_cpu_ptr(br->stats, cpu);
95
96                 sum.tx_bytes   += bstats->tx_bytes;
97                 sum.tx_packets += bstats->tx_packets;
98                 sum.rx_bytes   += bstats->rx_bytes;
99                 sum.rx_packets += bstats->rx_packets;
100         }
101
102         stats->tx_bytes   = sum.tx_bytes;
103         stats->tx_packets = sum.tx_packets;
104         stats->rx_bytes   = sum.rx_bytes;
105         stats->rx_packets = sum.rx_packets;
106
107         return stats;
108 }
109
110 static int br_change_mtu(struct net_device *dev, int new_mtu)
111 {
112         struct net_bridge *br = netdev_priv(dev);
113         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
114                 return -EINVAL;
115
116         dev->mtu = new_mtu;
117
118 #ifdef CONFIG_BRIDGE_NETFILTER
119         /* remember the MTU in the rtable for PMTU */
120         br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
121 #endif
122
123         return 0;
124 }
125
126 /* Allow setting mac address to any valid ethernet address. */
127 static int br_set_mac_address(struct net_device *dev, void *p)
128 {
129         struct net_bridge *br = netdev_priv(dev);
130         struct sockaddr *addr = p;
131
132         if (!is_valid_ether_addr(addr->sa_data))
133                 return -EINVAL;
134
135         spin_lock_bh(&br->lock);
136         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
137         br_stp_change_bridge_id(br, addr->sa_data);
138         br->flags |= BR_SET_MAC_ADDR;
139         spin_unlock_bh(&br->lock);
140
141         return 0;
142 }
143
144 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
145 {
146         strcpy(info->driver, "bridge");
147         strcpy(info->version, BR_VERSION);
148         strcpy(info->fw_version, "N/A");
149         strcpy(info->bus_info, "N/A");
150 }
151
152 static int br_set_sg(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_SG;
158         else
159                 br->feature_mask &= ~NETIF_F_SG;
160
161         br_features_recompute(br);
162         return 0;
163 }
164
165 static int br_set_tso(struct net_device *dev, u32 data)
166 {
167         struct net_bridge *br = netdev_priv(dev);
168
169         if (data)
170                 br->feature_mask |= NETIF_F_TSO;
171         else
172                 br->feature_mask &= ~NETIF_F_TSO;
173
174         br_features_recompute(br);
175         return 0;
176 }
177
178 static int br_set_tx_csum(struct net_device *dev, u32 data)
179 {
180         struct net_bridge *br = netdev_priv(dev);
181
182         if (data)
183                 br->feature_mask |= NETIF_F_NO_CSUM;
184         else
185                 br->feature_mask &= ~NETIF_F_ALL_CSUM;
186
187         br_features_recompute(br);
188         return 0;
189 }
190
191 static const struct ethtool_ops br_ethtool_ops = {
192         .get_drvinfo    = br_getinfo,
193         .get_link       = ethtool_op_get_link,
194         .get_tx_csum    = ethtool_op_get_tx_csum,
195         .set_tx_csum    = br_set_tx_csum,
196         .get_sg         = ethtool_op_get_sg,
197         .set_sg         = br_set_sg,
198         .get_tso        = ethtool_op_get_tso,
199         .set_tso        = br_set_tso,
200         .get_ufo        = ethtool_op_get_ufo,
201         .set_ufo        = ethtool_op_set_ufo,
202         .get_flags      = ethtool_op_get_flags,
203 };
204
205 static const struct net_device_ops br_netdev_ops = {
206         .ndo_open                = br_dev_open,
207         .ndo_stop                = br_dev_stop,
208         .ndo_start_xmit          = br_dev_xmit,
209         .ndo_get_stats           = br_get_stats,
210         .ndo_set_mac_address     = br_set_mac_address,
211         .ndo_set_multicast_list  = br_dev_set_multicast_list,
212         .ndo_change_mtu          = br_change_mtu,
213         .ndo_do_ioctl            = br_dev_ioctl,
214 };
215
216 static void br_dev_free(struct net_device *dev)
217 {
218         struct net_bridge *br = netdev_priv(dev);
219
220         free_percpu(br->stats);
221         free_netdev(dev);
222 }
223
224 void br_dev_setup(struct net_device *dev)
225 {
226         random_ether_addr(dev->dev_addr);
227         ether_setup(dev);
228
229         dev->netdev_ops = &br_netdev_ops;
230         dev->destructor = br_dev_free;
231         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
232         dev->tx_queue_len = 0;
233         dev->priv_flags = IFF_EBRIDGE;
234
235         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
236                         NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
237                         NETIF_F_NETNS_LOCAL | NETIF_F_GSO;
238 }