net: Add ->neigh_lookup() operation to dst_ops
[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 BH 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         u64_stats_update_begin(&brstats->syncp);
42         brstats->tx_packets++;
43         brstats->tx_bytes += skb->len;
44         u64_stats_update_end(&brstats->syncp);
45
46         BR_INPUT_SKB_CB(skb)->brdev = dev;
47
48         skb_reset_mac_header(skb);
49         skb_pull(skb, ETH_HLEN);
50
51         rcu_read_lock();
52         if (is_broadcast_ether_addr(dest))
53                 br_flood_deliver(br, skb);
54         else if (is_multicast_ether_addr(dest)) {
55                 if (unlikely(netpoll_tx_running(dev))) {
56                         br_flood_deliver(br, skb);
57                         goto out;
58                 }
59                 if (br_multicast_rcv(br, NULL, skb)) {
60                         kfree_skb(skb);
61                         goto out;
62                 }
63
64                 mdst = br_mdb_get(br, skb);
65                 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
66                         br_multicast_deliver(mdst, skb);
67                 else
68                         br_flood_deliver(br, skb);
69         } else if ((dst = __br_fdb_get(br, dest)) != NULL)
70                 br_deliver(dst->dst, skb);
71         else
72                 br_flood_deliver(br, skb);
73
74 out:
75         rcu_read_unlock();
76         return NETDEV_TX_OK;
77 }
78
79 static int br_dev_init(struct net_device *dev)
80 {
81         struct net_bridge *br = netdev_priv(dev);
82
83         br->stats = alloc_percpu(struct br_cpu_netstats);
84         if (!br->stats)
85                 return -ENOMEM;
86
87         return 0;
88 }
89
90 static int br_dev_open(struct net_device *dev)
91 {
92         struct net_bridge *br = netdev_priv(dev);
93
94         netif_carrier_off(dev);
95         netdev_update_features(dev);
96         netif_start_queue(dev);
97         br_stp_enable_bridge(br);
98         br_multicast_open(br);
99
100         return 0;
101 }
102
103 static void br_dev_set_multicast_list(struct net_device *dev)
104 {
105 }
106
107 static int br_dev_stop(struct net_device *dev)
108 {
109         struct net_bridge *br = netdev_priv(dev);
110
111         netif_carrier_off(dev);
112
113         br_stp_disable_bridge(br);
114         br_multicast_stop(br);
115
116         netif_stop_queue(dev);
117
118         return 0;
119 }
120
121 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
122                                                 struct rtnl_link_stats64 *stats)
123 {
124         struct net_bridge *br = netdev_priv(dev);
125         struct br_cpu_netstats tmp, sum = { 0 };
126         unsigned int cpu;
127
128         for_each_possible_cpu(cpu) {
129                 unsigned int start;
130                 const struct br_cpu_netstats *bstats
131                         = per_cpu_ptr(br->stats, cpu);
132                 do {
133                         start = u64_stats_fetch_begin(&bstats->syncp);
134                         memcpy(&tmp, bstats, sizeof(tmp));
135                 } while (u64_stats_fetch_retry(&bstats->syncp, start));
136                 sum.tx_bytes   += tmp.tx_bytes;
137                 sum.tx_packets += tmp.tx_packets;
138                 sum.rx_bytes   += tmp.rx_bytes;
139                 sum.rx_packets += tmp.rx_packets;
140         }
141
142         stats->tx_bytes   = sum.tx_bytes;
143         stats->tx_packets = sum.tx_packets;
144         stats->rx_bytes   = sum.rx_bytes;
145         stats->rx_packets = sum.rx_packets;
146
147         return stats;
148 }
149
150 static int br_change_mtu(struct net_device *dev, int new_mtu)
151 {
152         struct net_bridge *br = netdev_priv(dev);
153         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
154                 return -EINVAL;
155
156         dev->mtu = new_mtu;
157
158 #ifdef CONFIG_BRIDGE_NETFILTER
159         /* remember the MTU in the rtable for PMTU */
160         dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
161 #endif
162
163         return 0;
164 }
165
166 /* Allow setting mac address to any valid ethernet address. */
167 static int br_set_mac_address(struct net_device *dev, void *p)
168 {
169         struct net_bridge *br = netdev_priv(dev);
170         struct sockaddr *addr = p;
171
172         if (!is_valid_ether_addr(addr->sa_data))
173                 return -EINVAL;
174
175         spin_lock_bh(&br->lock);
176         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
177         br_stp_change_bridge_id(br, addr->sa_data);
178         br->flags |= BR_SET_MAC_ADDR;
179         spin_unlock_bh(&br->lock);
180
181         return 0;
182 }
183
184 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
185 {
186         strcpy(info->driver, "bridge");
187         strcpy(info->version, BR_VERSION);
188         strcpy(info->fw_version, "N/A");
189         strcpy(info->bus_info, "N/A");
190 }
191
192 static u32 br_fix_features(struct net_device *dev, u32 features)
193 {
194         struct net_bridge *br = netdev_priv(dev);
195
196         return br_features_recompute(br, features);
197 }
198
199 #ifdef CONFIG_NET_POLL_CONTROLLER
200 static void br_poll_controller(struct net_device *br_dev)
201 {
202 }
203
204 static void br_netpoll_cleanup(struct net_device *dev)
205 {
206         struct net_bridge *br = netdev_priv(dev);
207         struct net_bridge_port *p, *n;
208
209         list_for_each_entry_safe(p, n, &br->port_list, list) {
210                 br_netpoll_disable(p);
211         }
212 }
213
214 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
215 {
216         struct net_bridge *br = netdev_priv(dev);
217         struct net_bridge_port *p, *n;
218         int err = 0;
219
220         list_for_each_entry_safe(p, n, &br->port_list, list) {
221                 if (!p->dev)
222                         continue;
223
224                 err = br_netpoll_enable(p);
225                 if (err)
226                         goto fail;
227         }
228
229 out:
230         return err;
231
232 fail:
233         br_netpoll_cleanup(dev);
234         goto out;
235 }
236
237 int br_netpoll_enable(struct net_bridge_port *p)
238 {
239         struct netpoll *np;
240         int err = 0;
241
242         np = kzalloc(sizeof(*p->np), GFP_KERNEL);
243         err = -ENOMEM;
244         if (!np)
245                 goto out;
246
247         np->dev = p->dev;
248         strlcpy(np->dev_name, p->dev->name, IFNAMSIZ);
249
250         err = __netpoll_setup(np);
251         if (err) {
252                 kfree(np);
253                 goto out;
254         }
255
256         p->np = np;
257
258 out:
259         return err;
260 }
261
262 void br_netpoll_disable(struct net_bridge_port *p)
263 {
264         struct netpoll *np = p->np;
265
266         if (!np)
267                 return;
268
269         p->np = NULL;
270
271         /* Wait for transmitting packets to finish before freeing. */
272         synchronize_rcu_bh();
273
274         __netpoll_cleanup(np);
275         kfree(np);
276 }
277
278 #endif
279
280 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
281
282 {
283         struct net_bridge *br = netdev_priv(dev);
284
285         return br_add_if(br, slave_dev);
286 }
287
288 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
289 {
290         struct net_bridge *br = netdev_priv(dev);
291
292         return br_del_if(br, slave_dev);
293 }
294
295 static const struct ethtool_ops br_ethtool_ops = {
296         .get_drvinfo    = br_getinfo,
297         .get_link       = ethtool_op_get_link,
298 };
299
300 static const struct net_device_ops br_netdev_ops = {
301         .ndo_open                = br_dev_open,
302         .ndo_stop                = br_dev_stop,
303         .ndo_init                = br_dev_init,
304         .ndo_start_xmit          = br_dev_xmit,
305         .ndo_get_stats64         = br_get_stats64,
306         .ndo_set_mac_address     = br_set_mac_address,
307         .ndo_set_multicast_list  = br_dev_set_multicast_list,
308         .ndo_change_mtu          = br_change_mtu,
309         .ndo_do_ioctl            = br_dev_ioctl,
310 #ifdef CONFIG_NET_POLL_CONTROLLER
311         .ndo_netpoll_setup       = br_netpoll_setup,
312         .ndo_netpoll_cleanup     = br_netpoll_cleanup,
313         .ndo_poll_controller     = br_poll_controller,
314 #endif
315         .ndo_add_slave           = br_add_slave,
316         .ndo_del_slave           = br_del_slave,
317         .ndo_fix_features        = br_fix_features,
318 };
319
320 static void br_dev_free(struct net_device *dev)
321 {
322         struct net_bridge *br = netdev_priv(dev);
323
324         free_percpu(br->stats);
325         free_netdev(dev);
326 }
327
328 static struct device_type br_type = {
329         .name   = "bridge",
330 };
331
332 void br_dev_setup(struct net_device *dev)
333 {
334         struct net_bridge *br = netdev_priv(dev);
335
336         random_ether_addr(dev->dev_addr);
337         ether_setup(dev);
338
339         dev->netdev_ops = &br_netdev_ops;
340         dev->destructor = br_dev_free;
341         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
342         SET_NETDEV_DEVTYPE(dev, &br_type);
343         dev->tx_queue_len = 0;
344         dev->priv_flags = IFF_EBRIDGE;
345
346         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
347                         NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
348                         NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX;
349         dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
350                            NETIF_F_GSO_MASK | NETIF_F_NO_CSUM |
351                            NETIF_F_HW_VLAN_TX;
352
353         br->dev = dev;
354         spin_lock_init(&br->lock);
355         INIT_LIST_HEAD(&br->port_list);
356         spin_lock_init(&br->hash_lock);
357
358         br->bridge_id.prio[0] = 0x80;
359         br->bridge_id.prio[1] = 0x00;
360
361         memcpy(br->group_addr, br_group_address, ETH_ALEN);
362
363         br->stp_enabled = BR_NO_STP;
364         br->designated_root = br->bridge_id;
365         br->bridge_max_age = br->max_age = 20 * HZ;
366         br->bridge_hello_time = br->hello_time = 2 * HZ;
367         br->bridge_forward_delay = br->forward_delay = 15 * HZ;
368         br->ageing_time = 300 * HZ;
369
370         br_netfilter_rtable_init(br);
371         br_stp_timer_init(br);
372         br_multicast_init(br);
373 }