bridge: Implement vlan ingress/egress policy with PVID.
[linux-3.10.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         u16 vid = 0;
34
35         rcu_read_lock();
36 #ifdef CONFIG_BRIDGE_NETFILTER
37         if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
38                 br_nf_pre_routing_finish_bridge_slow(skb);
39                 rcu_read_unlock();
40                 return NETDEV_TX_OK;
41         }
42 #endif
43
44         u64_stats_update_begin(&brstats->syncp);
45         brstats->tx_packets++;
46         brstats->tx_bytes += skb->len;
47         u64_stats_update_end(&brstats->syncp);
48
49         if (!br_allowed_ingress(br, br_get_vlan_info(br), skb, &vid))
50                 goto out;
51
52         BR_INPUT_SKB_CB(skb)->brdev = dev;
53
54         skb_reset_mac_header(skb);
55         skb_pull(skb, ETH_HLEN);
56
57         if (is_broadcast_ether_addr(dest))
58                 br_flood_deliver(br, skb);
59         else if (is_multicast_ether_addr(dest)) {
60                 if (unlikely(netpoll_tx_running(dev))) {
61                         br_flood_deliver(br, skb);
62                         goto out;
63                 }
64                 if (br_multicast_rcv(br, NULL, skb)) {
65                         kfree_skb(skb);
66                         goto out;
67                 }
68
69                 mdst = br_mdb_get(br, skb);
70                 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
71                         br_multicast_deliver(mdst, skb);
72                 else
73                         br_flood_deliver(br, skb);
74         } else if ((dst = __br_fdb_get(br, dest)) != NULL)
75                 br_deliver(dst->dst, skb);
76         else
77                 br_flood_deliver(br, skb);
78
79 out:
80         rcu_read_unlock();
81         return NETDEV_TX_OK;
82 }
83
84 static int br_dev_init(struct net_device *dev)
85 {
86         struct net_bridge *br = netdev_priv(dev);
87
88         br->stats = alloc_percpu(struct br_cpu_netstats);
89         if (!br->stats)
90                 return -ENOMEM;
91
92         return 0;
93 }
94
95 static int br_dev_open(struct net_device *dev)
96 {
97         struct net_bridge *br = netdev_priv(dev);
98
99         netdev_update_features(dev);
100         netif_start_queue(dev);
101         br_stp_enable_bridge(br);
102         br_multicast_open(br);
103
104         return 0;
105 }
106
107 static void br_dev_set_multicast_list(struct net_device *dev)
108 {
109 }
110
111 static int br_dev_stop(struct net_device *dev)
112 {
113         struct net_bridge *br = netdev_priv(dev);
114
115         br_stp_disable_bridge(br);
116         br_multicast_stop(br);
117
118         netif_stop_queue(dev);
119
120         return 0;
121 }
122
123 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
124                                                 struct rtnl_link_stats64 *stats)
125 {
126         struct net_bridge *br = netdev_priv(dev);
127         struct br_cpu_netstats tmp, sum = { 0 };
128         unsigned int cpu;
129
130         for_each_possible_cpu(cpu) {
131                 unsigned int start;
132                 const struct br_cpu_netstats *bstats
133                         = per_cpu_ptr(br->stats, cpu);
134                 do {
135                         start = u64_stats_fetch_begin_bh(&bstats->syncp);
136                         memcpy(&tmp, bstats, sizeof(tmp));
137                 } while (u64_stats_fetch_retry_bh(&bstats->syncp, start));
138                 sum.tx_bytes   += tmp.tx_bytes;
139                 sum.tx_packets += tmp.tx_packets;
140                 sum.rx_bytes   += tmp.rx_bytes;
141                 sum.rx_packets += tmp.rx_packets;
142         }
143
144         stats->tx_bytes   = sum.tx_bytes;
145         stats->tx_packets = sum.tx_packets;
146         stats->rx_bytes   = sum.rx_bytes;
147         stats->rx_packets = sum.rx_packets;
148
149         return stats;
150 }
151
152 static int br_change_mtu(struct net_device *dev, int new_mtu)
153 {
154         struct net_bridge *br = netdev_priv(dev);
155         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
156                 return -EINVAL;
157
158         dev->mtu = new_mtu;
159
160 #ifdef CONFIG_BRIDGE_NETFILTER
161         /* remember the MTU in the rtable for PMTU */
162         dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
163 #endif
164
165         return 0;
166 }
167
168 /* Allow setting mac address to any valid ethernet address. */
169 static int br_set_mac_address(struct net_device *dev, void *p)
170 {
171         struct net_bridge *br = netdev_priv(dev);
172         struct sockaddr *addr = p;
173
174         if (!is_valid_ether_addr(addr->sa_data))
175                 return -EADDRNOTAVAIL;
176
177         spin_lock_bh(&br->lock);
178         if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
179                 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
180                 br_fdb_change_mac_address(br, addr->sa_data);
181                 br_stp_change_bridge_id(br, addr->sa_data);
182         }
183         spin_unlock_bh(&br->lock);
184
185         return 0;
186 }
187
188 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
189 {
190         strlcpy(info->driver, "bridge", sizeof(info->driver));
191         strlcpy(info->version, BR_VERSION, sizeof(info->version));
192         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
193         strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
194 }
195
196 static netdev_features_t br_fix_features(struct net_device *dev,
197         netdev_features_t features)
198 {
199         struct net_bridge *br = netdev_priv(dev);
200
201         return br_features_recompute(br, features);
202 }
203
204 #ifdef CONFIG_NET_POLL_CONTROLLER
205 static void br_poll_controller(struct net_device *br_dev)
206 {
207 }
208
209 static void br_netpoll_cleanup(struct net_device *dev)
210 {
211         struct net_bridge *br = netdev_priv(dev);
212         struct net_bridge_port *p;
213
214         list_for_each_entry(p, &br->port_list, list)
215                 br_netpoll_disable(p);
216 }
217
218 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni,
219                             gfp_t gfp)
220 {
221         struct net_bridge *br = netdev_priv(dev);
222         struct net_bridge_port *p;
223         int err = 0;
224
225         list_for_each_entry(p, &br->port_list, list) {
226                 if (!p->dev)
227                         continue;
228                 err = br_netpoll_enable(p, gfp);
229                 if (err)
230                         goto fail;
231         }
232
233 out:
234         return err;
235
236 fail:
237         br_netpoll_cleanup(dev);
238         goto out;
239 }
240
241 int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
242 {
243         struct netpoll *np;
244         int err = 0;
245
246         np = kzalloc(sizeof(*p->np), gfp);
247         err = -ENOMEM;
248         if (!np)
249                 goto out;
250
251         err = __netpoll_setup(np, p->dev, gfp);
252         if (err) {
253                 kfree(np);
254                 goto out;
255         }
256
257         p->np = np;
258
259 out:
260         return err;
261 }
262
263 void br_netpoll_disable(struct net_bridge_port *p)
264 {
265         struct netpoll *np = p->np;
266
267         if (!np)
268                 return;
269
270         p->np = NULL;
271
272         __netpoll_free_async(np);
273 }
274
275 #endif
276
277 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
278
279 {
280         struct net_bridge *br = netdev_priv(dev);
281
282         return br_add_if(br, slave_dev);
283 }
284
285 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
286 {
287         struct net_bridge *br = netdev_priv(dev);
288
289         return br_del_if(br, slave_dev);
290 }
291
292 static const struct ethtool_ops br_ethtool_ops = {
293         .get_drvinfo    = br_getinfo,
294         .get_link       = ethtool_op_get_link,
295 };
296
297 static const struct net_device_ops br_netdev_ops = {
298         .ndo_open                = br_dev_open,
299         .ndo_stop                = br_dev_stop,
300         .ndo_init                = br_dev_init,
301         .ndo_start_xmit          = br_dev_xmit,
302         .ndo_get_stats64         = br_get_stats64,
303         .ndo_set_mac_address     = br_set_mac_address,
304         .ndo_set_rx_mode         = br_dev_set_multicast_list,
305         .ndo_change_mtu          = br_change_mtu,
306         .ndo_do_ioctl            = br_dev_ioctl,
307 #ifdef CONFIG_NET_POLL_CONTROLLER
308         .ndo_netpoll_setup       = br_netpoll_setup,
309         .ndo_netpoll_cleanup     = br_netpoll_cleanup,
310         .ndo_poll_controller     = br_poll_controller,
311 #endif
312         .ndo_add_slave           = br_add_slave,
313         .ndo_del_slave           = br_del_slave,
314         .ndo_fix_features        = br_fix_features,
315         .ndo_fdb_add             = br_fdb_add,
316         .ndo_fdb_del             = br_fdb_delete,
317         .ndo_fdb_dump            = br_fdb_dump,
318         .ndo_bridge_getlink      = br_getlink,
319         .ndo_bridge_setlink      = br_setlink,
320         .ndo_bridge_dellink      = br_dellink,
321 };
322
323 static void br_dev_free(struct net_device *dev)
324 {
325         struct net_bridge *br = netdev_priv(dev);
326
327         free_percpu(br->stats);
328         free_netdev(dev);
329 }
330
331 static struct device_type br_type = {
332         .name   = "bridge",
333 };
334
335 void br_dev_setup(struct net_device *dev)
336 {
337         struct net_bridge *br = netdev_priv(dev);
338
339         eth_hw_addr_random(dev);
340         ether_setup(dev);
341
342         dev->netdev_ops = &br_netdev_ops;
343         dev->destructor = br_dev_free;
344         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
345         SET_NETDEV_DEVTYPE(dev, &br_type);
346         dev->tx_queue_len = 0;
347         dev->priv_flags = IFF_EBRIDGE;
348
349         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
350                         NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | NETIF_F_LLTX |
351                         NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX;
352         dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
353                            NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
354                            NETIF_F_HW_VLAN_TX;
355
356         br->dev = dev;
357         spin_lock_init(&br->lock);
358         INIT_LIST_HEAD(&br->port_list);
359         spin_lock_init(&br->hash_lock);
360
361         br->bridge_id.prio[0] = 0x80;
362         br->bridge_id.prio[1] = 0x00;
363
364         memcpy(br->group_addr, eth_reserved_addr_base, ETH_ALEN);
365
366         br->stp_enabled = BR_NO_STP;
367         br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
368
369         br->designated_root = br->bridge_id;
370         br->bridge_max_age = br->max_age = 20 * HZ;
371         br->bridge_hello_time = br->hello_time = 2 * HZ;
372         br->bridge_forward_delay = br->forward_delay = 15 * HZ;
373         br->ageing_time = 300 * HZ;
374
375         br_netfilter_rtable_init(br);
376         br_stp_timer_init(br);
377         br_multicast_init(br);
378 }