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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
26netdev_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
74out:
75 rcu_read_unlock();
76 return NETDEV_TX_OK;
77}
78
79static 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
90static int br_dev_open(struct net_device *dev)
91{
92 struct net_bridge *br = netdev_priv(dev);
93
94 netdev_update_features(dev);
95 netif_start_queue(dev);
96 br_stp_enable_bridge(br);
97 br_multicast_open(br);
98
99 return 0;
100}
101
102static void br_dev_set_multicast_list(struct net_device *dev)
103{
104}
105
106static int br_dev_stop(struct net_device *dev)
107{
108 struct net_bridge *br = netdev_priv(dev);
109
110 br_stp_disable_bridge(br);
111 br_multicast_stop(br);
112
113 netif_stop_queue(dev);
114
115 return 0;
116}
117
118static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
119 struct rtnl_link_stats64 *stats)
120{
121 struct net_bridge *br = netdev_priv(dev);
122 struct br_cpu_netstats tmp, sum = { 0 };
123 unsigned int cpu;
124
125 for_each_possible_cpu(cpu) {
126 unsigned int start;
127 const struct br_cpu_netstats *bstats
128 = per_cpu_ptr(br->stats, cpu);
129 do {
130 start = u64_stats_fetch_begin(&bstats->syncp);
131 memcpy(&tmp, bstats, sizeof(tmp));
132 } while (u64_stats_fetch_retry(&bstats->syncp, start));
133 sum.tx_bytes += tmp.tx_bytes;
134 sum.tx_packets += tmp.tx_packets;
135 sum.rx_bytes += tmp.rx_bytes;
136 sum.rx_packets += tmp.rx_packets;
137 }
138
139 stats->tx_bytes = sum.tx_bytes;
140 stats->tx_packets = sum.tx_packets;
141 stats->rx_bytes = sum.rx_bytes;
142 stats->rx_packets = sum.rx_packets;
143
144 return stats;
145}
146
147static int br_change_mtu(struct net_device *dev, int new_mtu)
148{
149 struct net_bridge *br = netdev_priv(dev);
150 if (new_mtu < 68 || new_mtu > br_min_mtu(br))
151 return -EINVAL;
152
153 dev->mtu = new_mtu;
154
155#ifdef CONFIG_BRIDGE_NETFILTER
156
157 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
158#endif
159
160 return 0;
161}
162
163
164static int br_set_mac_address(struct net_device *dev, void *p)
165{
166 struct net_bridge *br = netdev_priv(dev);
167 struct sockaddr *addr = p;
168
169 if (!is_valid_ether_addr(addr->sa_data))
170 return -EINVAL;
171
172 spin_lock_bh(&br->lock);
173 if (compare_ether_addr(dev->dev_addr, addr->sa_data)) {
174 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
175 br_fdb_change_mac_address(br, addr->sa_data);
176 br_stp_change_bridge_id(br, addr->sa_data);
177 }
178 br->flags |= BR_SET_MAC_ADDR;
179 spin_unlock_bh(&br->lock);
180
181 return 0;
182}
183
184static 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
192static netdev_features_t br_fix_features(struct net_device *dev,
193 netdev_features_t features)
194{
195 struct net_bridge *br = netdev_priv(dev);
196
197 return br_features_recompute(br, features);
198}
199
200#ifdef CONFIG_NET_POLL_CONTROLLER
201static void br_poll_controller(struct net_device *br_dev)
202{
203}
204
205static void br_netpoll_cleanup(struct net_device *dev)
206{
207 struct net_bridge *br = netdev_priv(dev);
208 struct net_bridge_port *p, *n;
209
210 list_for_each_entry_safe(p, n, &br->port_list, list) {
211 br_netpoll_disable(p);
212 }
213}
214
215static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
216{
217 struct net_bridge *br = netdev_priv(dev);
218 struct net_bridge_port *p, *n;
219 int err = 0;
220
221 list_for_each_entry_safe(p, n, &br->port_list, list) {
222 if (!p->dev)
223 continue;
224
225 err = br_netpoll_enable(p);
226 if (err)
227 goto fail;
228 }
229
230out:
231 return err;
232
233fail:
234 br_netpoll_cleanup(dev);
235 goto out;
236}
237
238int br_netpoll_enable(struct net_bridge_port *p)
239{
240 struct netpoll *np;
241 int err = 0;
242
243 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
244 err = -ENOMEM;
245 if (!np)
246 goto out;
247
248 np->dev = p->dev;
249 strlcpy(np->dev_name, p->dev->name, IFNAMSIZ);
250
251 err = __netpoll_setup(np);
252 if (err) {
253 kfree(np);
254 goto out;
255 }
256
257 p->np = np;
258
259out:
260 return err;
261}
262
263void 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
273 synchronize_rcu_bh();
274
275 __netpoll_cleanup(np);
276 kfree(np);
277}
278
279#endif
280
281static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
282
283{
284 struct net_bridge *br = netdev_priv(dev);
285
286 return br_add_if(br, slave_dev);
287}
288
289static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
290{
291 struct net_bridge *br = netdev_priv(dev);
292
293 return br_del_if(br, slave_dev);
294}
295
296static const struct ethtool_ops br_ethtool_ops = {
297 .get_drvinfo = br_getinfo,
298 .get_link = ethtool_op_get_link,
299};
300
301static const struct net_device_ops br_netdev_ops = {
302 .ndo_open = br_dev_open,
303 .ndo_stop = br_dev_stop,
304 .ndo_init = br_dev_init,
305 .ndo_start_xmit = br_dev_xmit,
306 .ndo_get_stats64 = br_get_stats64,
307 .ndo_set_mac_address = br_set_mac_address,
308 .ndo_set_rx_mode = br_dev_set_multicast_list,
309 .ndo_change_mtu = br_change_mtu,
310 .ndo_do_ioctl = br_dev_ioctl,
311#ifdef CONFIG_NET_POLL_CONTROLLER
312 .ndo_netpoll_setup = br_netpoll_setup,
313 .ndo_netpoll_cleanup = br_netpoll_cleanup,
314 .ndo_poll_controller = br_poll_controller,
315#endif
316 .ndo_add_slave = br_add_slave,
317 .ndo_del_slave = br_del_slave,
318 .ndo_fix_features = br_fix_features,
319};
320
321static void br_dev_free(struct net_device *dev)
322{
323 struct net_bridge *br = netdev_priv(dev);
324
325 free_percpu(br->stats);
326 free_netdev(dev);
327}
328
329static struct device_type br_type = {
330 .name = "bridge",
331};
332
333void br_dev_setup(struct net_device *dev)
334{
335 struct net_bridge *br = netdev_priv(dev);
336
337 random_ether_addr(dev->dev_addr);
338 ether_setup(dev);
339
340 dev->netdev_ops = &br_netdev_ops;
341 dev->destructor = br_dev_free;
342 SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
343 SET_NETDEV_DEVTYPE(dev, &br_type);
344 dev->tx_queue_len = 0;
345 dev->priv_flags = IFF_EBRIDGE;
346
347 dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
348 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | NETIF_F_LLTX |
349 NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX;
350 dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
351 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
352 NETIF_F_HW_VLAN_TX;
353
354 br->dev = dev;
355 spin_lock_init(&br->lock);
356 INIT_LIST_HEAD(&br->port_list);
357 spin_lock_init(&br->hash_lock);
358
359 br->bridge_id.prio[0] = 0x80;
360 br->bridge_id.prio[1] = 0x00;
361
362 memcpy(br->group_addr, br_group_address, ETH_ALEN);
363
364 br->stp_enabled = BR_NO_STP;
365 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
366
367 br->designated_root = br->bridge_id;
368 br->bridge_max_age = br->max_age = 20 * HZ;
369 br->bridge_hello_time = br->hello_time = 2 * HZ;
370 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
371 br->ageing_time = 300 * HZ;
372
373 br_netfilter_rtable_init(br);
374 br_stp_timer_init(br);
375 br_multicast_init(br);
376}
377
