Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[sfrench/cifs-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_multicast_ether_addr(dest)) {
53                 if (unlikely(netpoll_tx_running(dev))) {
54                         br_flood_deliver(br, skb);
55                         goto out;
56                 }
57                 if (br_multicast_rcv(br, NULL, skb)) {
58                         kfree_skb(skb);
59                         goto out;
60                 }
61
62                 mdst = br_mdb_get(br, skb);
63                 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
64                         br_multicast_deliver(mdst, skb);
65                 else
66                         br_flood_deliver(br, skb);
67         } else if ((dst = __br_fdb_get(br, dest)) != NULL)
68                 br_deliver(dst->dst, skb);
69         else
70                 br_flood_deliver(br, skb);
71
72 out:
73         rcu_read_unlock();
74         return NETDEV_TX_OK;
75 }
76
77 static int br_dev_open(struct net_device *dev)
78 {
79         struct net_bridge *br = netdev_priv(dev);
80
81         br_features_recompute(br);
82         netif_start_queue(dev);
83         br_stp_enable_bridge(br);
84         br_multicast_open(br);
85
86         return 0;
87 }
88
89 static void br_dev_set_multicast_list(struct net_device *dev)
90 {
91 }
92
93 static int br_dev_stop(struct net_device *dev)
94 {
95         struct net_bridge *br = netdev_priv(dev);
96
97         br_stp_disable_bridge(br);
98         br_multicast_stop(br);
99
100         netif_stop_queue(dev);
101
102         return 0;
103 }
104
105 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
106                                                 struct rtnl_link_stats64 *stats)
107 {
108         struct net_bridge *br = netdev_priv(dev);
109         struct br_cpu_netstats tmp, sum = { 0 };
110         unsigned int cpu;
111
112         for_each_possible_cpu(cpu) {
113                 unsigned int start;
114                 const struct br_cpu_netstats *bstats
115                         = per_cpu_ptr(br->stats, cpu);
116                 do {
117                         start = u64_stats_fetch_begin(&bstats->syncp);
118                         memcpy(&tmp, bstats, sizeof(tmp));
119                 } while (u64_stats_fetch_retry(&bstats->syncp, start));
120                 sum.tx_bytes   += tmp.tx_bytes;
121                 sum.tx_packets += tmp.tx_packets;
122                 sum.rx_bytes   += tmp.rx_bytes;
123                 sum.rx_packets += tmp.rx_packets;
124         }
125
126         stats->tx_bytes   = sum.tx_bytes;
127         stats->tx_packets = sum.tx_packets;
128         stats->rx_bytes   = sum.rx_bytes;
129         stats->rx_packets = sum.rx_packets;
130
131         return stats;
132 }
133
134 static int br_change_mtu(struct net_device *dev, int new_mtu)
135 {
136         struct net_bridge *br = netdev_priv(dev);
137         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
138                 return -EINVAL;
139
140         dev->mtu = new_mtu;
141
142 #ifdef CONFIG_BRIDGE_NETFILTER
143         /* remember the MTU in the rtable for PMTU */
144         br->fake_rtable.dst.metrics[RTAX_MTU - 1] = new_mtu;
145 #endif
146
147         return 0;
148 }
149
150 /* Allow setting mac address to any valid ethernet address. */
151 static int br_set_mac_address(struct net_device *dev, void *p)
152 {
153         struct net_bridge *br = netdev_priv(dev);
154         struct sockaddr *addr = p;
155
156         if (!is_valid_ether_addr(addr->sa_data))
157                 return -EINVAL;
158
159         spin_lock_bh(&br->lock);
160         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
161         br_stp_change_bridge_id(br, addr->sa_data);
162         br->flags |= BR_SET_MAC_ADDR;
163         spin_unlock_bh(&br->lock);
164
165         return 0;
166 }
167
168 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
169 {
170         strcpy(info->driver, "bridge");
171         strcpy(info->version, BR_VERSION);
172         strcpy(info->fw_version, "N/A");
173         strcpy(info->bus_info, "N/A");
174 }
175
176 static int br_set_sg(struct net_device *dev, u32 data)
177 {
178         struct net_bridge *br = netdev_priv(dev);
179
180         if (data)
181                 br->feature_mask |= NETIF_F_SG;
182         else
183                 br->feature_mask &= ~NETIF_F_SG;
184
185         br_features_recompute(br);
186         return 0;
187 }
188
189 static int br_set_tso(struct net_device *dev, u32 data)
190 {
191         struct net_bridge *br = netdev_priv(dev);
192
193         if (data)
194                 br->feature_mask |= NETIF_F_TSO;
195         else
196                 br->feature_mask &= ~NETIF_F_TSO;
197
198         br_features_recompute(br);
199         return 0;
200 }
201
202 static int br_set_tx_csum(struct net_device *dev, u32 data)
203 {
204         struct net_bridge *br = netdev_priv(dev);
205
206         if (data)
207                 br->feature_mask |= NETIF_F_NO_CSUM;
208         else
209                 br->feature_mask &= ~NETIF_F_ALL_CSUM;
210
211         br_features_recompute(br);
212         return 0;
213 }
214
215 #ifdef CONFIG_NET_POLL_CONTROLLER
216 static void br_poll_controller(struct net_device *br_dev)
217 {
218 }
219
220 static 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
225         list_for_each_entry_safe(p, n, &br->port_list, list) {
226                 br_netpoll_disable(p);
227         }
228 }
229
230 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
231 {
232         struct net_bridge *br = netdev_priv(dev);
233         struct net_bridge_port *p, *n;
234         int err = 0;
235
236         list_for_each_entry_safe(p, n, &br->port_list, list) {
237                 if (!p->dev)
238                         continue;
239
240                 err = br_netpoll_enable(p);
241                 if (err)
242                         goto fail;
243         }
244
245 out:
246         return err;
247
248 fail:
249         br_netpoll_cleanup(dev);
250         goto out;
251 }
252
253 int br_netpoll_enable(struct net_bridge_port *p)
254 {
255         struct netpoll *np;
256         int err = 0;
257
258         np = kzalloc(sizeof(*p->np), GFP_KERNEL);
259         err = -ENOMEM;
260         if (!np)
261                 goto out;
262
263         np->dev = p->dev;
264
265         err = __netpoll_setup(np);
266         if (err) {
267                 kfree(np);
268                 goto out;
269         }
270
271         p->np = np;
272
273 out:
274         return err;
275 }
276
277 void br_netpoll_disable(struct net_bridge_port *p)
278 {
279         struct netpoll *np = p->np;
280
281         if (!np)
282                 return;
283
284         p->np = NULL;
285
286         /* Wait for transmitting packets to finish before freeing. */
287         synchronize_rcu_bh();
288
289         __netpoll_cleanup(np);
290         kfree(np);
291 }
292
293 #endif
294
295 static const struct ethtool_ops br_ethtool_ops = {
296         .get_drvinfo    = br_getinfo,
297         .get_link       = ethtool_op_get_link,
298         .get_tx_csum    = ethtool_op_get_tx_csum,
299         .set_tx_csum    = br_set_tx_csum,
300         .get_sg         = ethtool_op_get_sg,
301         .set_sg         = br_set_sg,
302         .get_tso        = ethtool_op_get_tso,
303         .set_tso        = br_set_tso,
304         .get_ufo        = ethtool_op_get_ufo,
305         .set_ufo        = ethtool_op_set_ufo,
306         .get_flags      = ethtool_op_get_flags,
307 };
308
309 static const struct net_device_ops br_netdev_ops = {
310         .ndo_open                = br_dev_open,
311         .ndo_stop                = br_dev_stop,
312         .ndo_start_xmit          = br_dev_xmit,
313         .ndo_get_stats64         = br_get_stats64,
314         .ndo_set_mac_address     = br_set_mac_address,
315         .ndo_set_multicast_list  = br_dev_set_multicast_list,
316         .ndo_change_mtu          = br_change_mtu,
317         .ndo_do_ioctl            = br_dev_ioctl,
318 #ifdef CONFIG_NET_POLL_CONTROLLER
319         .ndo_netpoll_setup       = br_netpoll_setup,
320         .ndo_netpoll_cleanup     = br_netpoll_cleanup,
321         .ndo_poll_controller     = br_poll_controller,
322 #endif
323 };
324
325 static void br_dev_free(struct net_device *dev)
326 {
327         struct net_bridge *br = netdev_priv(dev);
328
329         free_percpu(br->stats);
330         free_netdev(dev);
331 }
332
333 void br_dev_setup(struct net_device *dev)
334 {
335         random_ether_addr(dev->dev_addr);
336         ether_setup(dev);
337
338         dev->netdev_ops = &br_netdev_ops;
339         dev->destructor = br_dev_free;
340         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
341         dev->tx_queue_len = 0;
342         dev->priv_flags = IFF_EBRIDGE;
343
344         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
345                         NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
346                         NETIF_F_NETNS_LOCAL | NETIF_F_GSO;
347 }