753fc4221f3c3587e41dfd816fd6e2771578a243
[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/netpoll.h>
17 #include <linux/etherdevice.h>
18 #include <linux/ethtool.h>
19 #include <linux/list.h>
20 #include <linux/netfilter_bridge.h>
21
22 #include <asm/uaccess.h>
23 #include "br_private.h"
24
25 /* net device transmit always called with no BH (preempt_disabled) */
26 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
27 {
28         struct net_bridge *br = netdev_priv(dev);
29         const unsigned char *dest = skb->data;
30         struct net_bridge_fdb_entry *dst;
31         struct net_bridge_mdb_entry *mdst;
32         struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);
33
34 #ifdef CONFIG_BRIDGE_NETFILTER
35         if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
36                 br_nf_pre_routing_finish_bridge_slow(skb);
37                 return NETDEV_TX_OK;
38         }
39 #endif
40
41         brstats->tx_packets++;
42         brstats->tx_bytes += skb->len;
43
44         BR_INPUT_SKB_CB(skb)->brdev = dev;
45
46         skb_reset_mac_header(skb);
47         skb_pull(skb, ETH_HLEN);
48
49         if (is_multicast_ether_addr(dest)) {
50                 if (br_multicast_rcv(br, NULL, skb))
51                         goto out;
52
53                 mdst = br_mdb_get(br, skb);
54                 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
55                         br_multicast_deliver(mdst, skb);
56                 else
57                         br_flood_deliver(br, skb);
58         } else if ((dst = __br_fdb_get(br, dest)) != NULL)
59                 br_deliver(dst->dst, skb);
60         else
61                 br_flood_deliver(br, skb);
62
63 out:
64         return NETDEV_TX_OK;
65 }
66
67 static int br_dev_open(struct net_device *dev)
68 {
69         struct net_bridge *br = netdev_priv(dev);
70
71         br_features_recompute(br);
72         netif_start_queue(dev);
73         br_stp_enable_bridge(br);
74         br_multicast_open(br);
75
76         return 0;
77 }
78
79 static void br_dev_set_multicast_list(struct net_device *dev)
80 {
81 }
82
83 static int br_dev_stop(struct net_device *dev)
84 {
85         struct net_bridge *br = netdev_priv(dev);
86
87         br_stp_disable_bridge(br);
88         br_multicast_stop(br);
89
90         netif_stop_queue(dev);
91
92         return 0;
93 }
94
95 static struct net_device_stats *br_get_stats(struct net_device *dev)
96 {
97         struct net_bridge *br = netdev_priv(dev);
98         struct net_device_stats *stats = &dev->stats;
99         struct br_cpu_netstats sum = { 0 };
100         unsigned int cpu;
101
102         for_each_possible_cpu(cpu) {
103                 const struct br_cpu_netstats *bstats
104                         = per_cpu_ptr(br->stats, cpu);
105
106                 sum.tx_bytes   += bstats->tx_bytes;
107                 sum.tx_packets += bstats->tx_packets;
108                 sum.rx_bytes   += bstats->rx_bytes;
109                 sum.rx_packets += bstats->rx_packets;
110         }
111
112         stats->tx_bytes   = sum.tx_bytes;
113         stats->tx_packets = sum.tx_packets;
114         stats->rx_bytes   = sum.rx_bytes;
115         stats->rx_packets = sum.rx_packets;
116
117         return stats;
118 }
119
120 static int br_change_mtu(struct net_device *dev, int new_mtu)
121 {
122         struct net_bridge *br = netdev_priv(dev);
123         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
124                 return -EINVAL;
125
126         dev->mtu = new_mtu;
127
128 #ifdef CONFIG_BRIDGE_NETFILTER
129         /* remember the MTU in the rtable for PMTU */
130         br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
131 #endif
132
133         return 0;
134 }
135
136 /* Allow setting mac address to any valid ethernet address. */
137 static int br_set_mac_address(struct net_device *dev, void *p)
138 {
139         struct net_bridge *br = netdev_priv(dev);
140         struct sockaddr *addr = p;
141
142         if (!is_valid_ether_addr(addr->sa_data))
143                 return -EINVAL;
144
145         spin_lock_bh(&br->lock);
146         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
147         br_stp_change_bridge_id(br, addr->sa_data);
148         br->flags |= BR_SET_MAC_ADDR;
149         spin_unlock_bh(&br->lock);
150
151         return 0;
152 }
153
154 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
155 {
156         strcpy(info->driver, "bridge");
157         strcpy(info->version, BR_VERSION);
158         strcpy(info->fw_version, "N/A");
159         strcpy(info->bus_info, "N/A");
160 }
161
162 static int br_set_sg(struct net_device *dev, u32 data)
163 {
164         struct net_bridge *br = netdev_priv(dev);
165
166         if (data)
167                 br->feature_mask |= NETIF_F_SG;
168         else
169                 br->feature_mask &= ~NETIF_F_SG;
170
171         br_features_recompute(br);
172         return 0;
173 }
174
175 static int br_set_tso(struct net_device *dev, u32 data)
176 {
177         struct net_bridge *br = netdev_priv(dev);
178
179         if (data)
180                 br->feature_mask |= NETIF_F_TSO;
181         else
182                 br->feature_mask &= ~NETIF_F_TSO;
183
184         br_features_recompute(br);
185         return 0;
186 }
187
188 static int br_set_tx_csum(struct net_device *dev, u32 data)
189 {
190         struct net_bridge *br = netdev_priv(dev);
191
192         if (data)
193                 br->feature_mask |= NETIF_F_NO_CSUM;
194         else
195                 br->feature_mask &= ~NETIF_F_ALL_CSUM;
196
197         br_features_recompute(br);
198         return 0;
199 }
200
201 #ifdef CONFIG_NET_POLL_CONTROLLER
202 static bool br_devices_support_netpoll(struct net_bridge *br)
203 {
204         struct net_bridge_port *p;
205         bool ret = true;
206         int count = 0;
207         unsigned long flags;
208
209         spin_lock_irqsave(&br->lock, flags);
210         list_for_each_entry(p, &br->port_list, list) {
211                 count++;
212                 if ((p->dev->priv_flags & IFF_DISABLE_NETPOLL) ||
213                     !p->dev->netdev_ops->ndo_poll_controller)
214                         ret = false;
215         }
216         spin_unlock_irqrestore(&br->lock, flags);
217         return count != 0 && ret;
218 }
219
220 void br_netpoll_cleanup(struct net_device *dev)
221 {
222         struct net_bridge *br = netdev_priv(dev);
223         struct net_bridge_port *p, *n;
224         const struct net_device_ops *ops;
225
226         br->dev->npinfo = NULL;
227         list_for_each_entry_safe(p, n, &br->port_list, list) {
228                 if (p->dev) {
229                         ops = p->dev->netdev_ops;
230                         if (ops->ndo_netpoll_cleanup)
231                                 ops->ndo_netpoll_cleanup(p->dev);
232                         else
233                                 p->dev->npinfo = NULL;
234                 }
235         }
236 }
237
238 void br_netpoll_disable(struct net_bridge *br,
239                         struct net_device *dev)
240 {
241         if (br_devices_support_netpoll(br))
242                 br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
243         if (dev->netdev_ops->ndo_netpoll_cleanup)
244                 dev->netdev_ops->ndo_netpoll_cleanup(dev);
245         else
246                 dev->npinfo = NULL;
247 }
248
249 void br_netpoll_enable(struct net_bridge *br,
250                        struct net_device *dev)
251 {
252         if (br_devices_support_netpoll(br)) {
253                 br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
254                 if (br->dev->npinfo)
255                         dev->npinfo = br->dev->npinfo;
256         } else if (!(br->dev->priv_flags & IFF_DISABLE_NETPOLL)) {
257                 br->dev->priv_flags |= IFF_DISABLE_NETPOLL;
258                 br_info(br,"new device %s does not support netpoll (disabling)",
259                         dev->name);
260         }
261 }
262
263 #endif
264
265 static const struct ethtool_ops br_ethtool_ops = {
266         .get_drvinfo    = br_getinfo,
267         .get_link       = ethtool_op_get_link,
268         .get_tx_csum    = ethtool_op_get_tx_csum,
269         .set_tx_csum    = br_set_tx_csum,
270         .get_sg         = ethtool_op_get_sg,
271         .set_sg         = br_set_sg,
272         .get_tso        = ethtool_op_get_tso,
273         .set_tso        = br_set_tso,
274         .get_ufo        = ethtool_op_get_ufo,
275         .set_ufo        = ethtool_op_set_ufo,
276         .get_flags      = ethtool_op_get_flags,
277 };
278
279 static const struct net_device_ops br_netdev_ops = {
280         .ndo_open                = br_dev_open,
281         .ndo_stop                = br_dev_stop,
282         .ndo_start_xmit          = br_dev_xmit,
283         .ndo_get_stats           = br_get_stats,
284         .ndo_set_mac_address     = br_set_mac_address,
285         .ndo_set_multicast_list  = br_dev_set_multicast_list,
286         .ndo_change_mtu          = br_change_mtu,
287         .ndo_do_ioctl            = br_dev_ioctl,
288 #ifdef CONFIG_NET_POLL_CONTROLLER
289         .ndo_netpoll_cleanup     = br_netpoll_cleanup,
290 #endif
291 };
292
293 static void br_dev_free(struct net_device *dev)
294 {
295         struct net_bridge *br = netdev_priv(dev);
296
297         free_percpu(br->stats);
298         free_netdev(dev);
299 }
300
301 void br_dev_setup(struct net_device *dev)
302 {
303         random_ether_addr(dev->dev_addr);
304         ether_setup(dev);
305
306         dev->netdev_ops = &br_netdev_ops;
307         dev->destructor = br_dev_free;
308         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
309         dev->tx_queue_len = 0;
310         dev->priv_flags = IFF_EBRIDGE;
311
312         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
313                         NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
314                         NETIF_F_NETNS_LOCAL | NETIF_F_GSO;
315 }