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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 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
174 br_stp_change_bridge_id(br, addr->sa_data);
175 br->flags |= BR_SET_MAC_ADDR;
176 spin_unlock_bh(&br->lock);
177
178 return 0;
179}
180
181static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
182{
183 strcpy(info->driver, "bridge");
184 strcpy(info->version, BR_VERSION);
185 strcpy(info->fw_version, "N/A");
186 strcpy(info->bus_info, "N/A");
187}
188
189static u32 br_fix_features(struct net_device *dev, u32 features)
190{
191 struct net_bridge *br = netdev_priv(dev);
192
193 return br_features_recompute(br, features);
194}
195
196#ifdef CONFIG_NET_POLL_CONTROLLER
197static void br_poll_controller(struct net_device *br_dev)
198{
199}
200
201static void br_netpoll_cleanup(struct net_device *dev)
202{
203 struct net_bridge *br = netdev_priv(dev);
204 struct net_bridge_port *p, *n;
205
206 list_for_each_entry_safe(p, n, &br->port_list, list) {
207 br_netpoll_disable(p);
208 }
209}
210
211static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
212{
213 struct net_bridge *br = netdev_priv(dev);
214 struct net_bridge_port *p, *n;
215 int err = 0;
216
217 list_for_each_entry_safe(p, n, &br->port_list, list) {
218 if (!p->dev)
219 continue;
220
221 err = br_netpoll_enable(p);
222 if (err)
223 goto fail;
224 }
225
226out:
227 return err;
228
229fail:
230 br_netpoll_cleanup(dev);
231 goto out;
232}
233
234int br_netpoll_enable(struct net_bridge_port *p)
235{
236 struct netpoll *np;
237 int err = 0;
238
239 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
240 err = -ENOMEM;
241 if (!np)
242 goto out;
243
244 np->dev = p->dev;
245 strlcpy(np->dev_name, p->dev->name, IFNAMSIZ);
246
247 err = __netpoll_setup(np);
248 if (err) {
249 kfree(np);
250 goto out;
251 }
252
253 p->np = np;
254
255out:
256 return err;
257}
258
259void br_netpoll_disable(struct net_bridge_port *p)
260{
261 struct netpoll *np = p->np;
262
263 if (!np)
264 return;
265
266 p->np = NULL;
267
268
269 synchronize_rcu_bh();
270
271 __netpoll_cleanup(np);
272 kfree(np);
273}
274
275#endif
276
277static 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
285static 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
292static const struct ethtool_ops br_ethtool_ops = {
293 .get_drvinfo = br_getinfo,
294 .get_link = ethtool_op_get_link,
295};
296
297static 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};
316
317static void br_dev_free(struct net_device *dev)
318{
319 struct net_bridge *br = netdev_priv(dev);
320
321 free_percpu(br->stats);
322 free_netdev(dev);
323}
324
325static struct device_type br_type = {
326 .name = "bridge",
327};
328
329void br_dev_setup(struct net_device *dev)
330{
331 struct net_bridge *br = netdev_priv(dev);
332
333 random_ether_addr(dev->dev_addr);
334 ether_setup(dev);
335
336 dev->netdev_ops = &br_netdev_ops;
337 dev->destructor = br_dev_free;
338 SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
339 SET_NETDEV_DEVTYPE(dev, &br_type);
340 dev->tx_queue_len = 0;
341 dev->priv_flags = IFF_EBRIDGE;
342
343 dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
344 NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
345 NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX;
346 dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
347 NETIF_F_GSO_MASK | NETIF_F_NO_CSUM |
348 NETIF_F_HW_VLAN_TX;
349
350 br->dev = dev;
351 spin_lock_init(&br->lock);
352 INIT_LIST_HEAD(&br->port_list);
353 spin_lock_init(&br->hash_lock);
354
355 br->bridge_id.prio[0] = 0x80;
356 br->bridge_id.prio[1] = 0x00;
357
358 memcpy(br->group_addr, br_group_address, ETH_ALEN);
359
360 br->stp_enabled = BR_NO_STP;
361 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
362
363 br->designated_root = br->bridge_id;
364 br->bridge_max_age = br->max_age = 20 * HZ;
365 br->bridge_hello_time = br->hello_time = 2 * HZ;
366 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
367 br->ageing_time = 300 * HZ;
368
369 br_netfilter_rtable_init(br);
370 br_stp_timer_init(br);
371 br_multicast_init(br);
372}
373
