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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 -EADDRNOTAVAIL;
171
172 spin_lock_bh(&br->lock);
173 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
174 dev->addr_assign_type &= ~NET_ADDR_RANDOM;
175 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
176 br_fdb_change_mac_address(br, addr->sa_data);
177 br_stp_change_bridge_id(br, addr->sa_data);
178 }
179 br->flags |= BR_SET_MAC_ADDR;
180 spin_unlock_bh(&br->lock);
181
182 return 0;
183}
184
185static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
186{
187 strcpy(info->driver, "bridge");
188 strcpy(info->version, BR_VERSION);
189 strcpy(info->fw_version, "N/A");
190 strcpy(info->bus_info, "N/A");
191}
192
193static netdev_features_t br_fix_features(struct net_device *dev,
194 netdev_features_t features)
195{
196 struct net_bridge *br = netdev_priv(dev);
197
198 return br_features_recompute(br, features);
199}
200
201#ifdef CONFIG_NET_POLL_CONTROLLER
202static void br_poll_controller(struct net_device *br_dev)
203{
204}
205
206static void br_netpoll_cleanup(struct net_device *dev)
207{
208 struct net_bridge *br = netdev_priv(dev);
209 struct net_bridge_port *p, *n;
210
211 list_for_each_entry_safe(p, n, &br->port_list, list) {
212 br_netpoll_disable(p);
213 }
214}
215
216static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
217{
218 struct net_bridge *br = netdev_priv(dev);
219 struct net_bridge_port *p, *n;
220 int err = 0;
221
222 list_for_each_entry_safe(p, n, &br->port_list, list) {
223 if (!p->dev)
224 continue;
225
226 err = br_netpoll_enable(p);
227 if (err)
228 goto fail;
229 }
230
231out:
232 return err;
233
234fail:
235 br_netpoll_cleanup(dev);
236 goto out;
237}
238
239int br_netpoll_enable(struct net_bridge_port *p)
240{
241 struct netpoll *np;
242 int err = 0;
243
244 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
245 err = -ENOMEM;
246 if (!np)
247 goto out;
248
249 np->dev = p->dev;
250 strlcpy(np->dev_name, p->dev->name, IFNAMSIZ);
251
252 err = __netpoll_setup(np);
253 if (err) {
254 kfree(np);
255 goto out;
256 }
257
258 p->np = np;
259
260out:
261 return err;
262}
263
264void br_netpoll_disable(struct net_bridge_port *p)
265{
266 struct netpoll *np = p->np;
267
268 if (!np)
269 return;
270
271 p->np = NULL;
272
273
274 synchronize_rcu_bh();
275
276 __netpoll_cleanup(np);
277 kfree(np);
278}
279
280#endif
281
282static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
283
284{
285 struct net_bridge *br = netdev_priv(dev);
286
287 return br_add_if(br, slave_dev);
288}
289
290static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
291{
292 struct net_bridge *br = netdev_priv(dev);
293
294 return br_del_if(br, slave_dev);
295}
296
297static const struct ethtool_ops br_ethtool_ops = {
298 .get_drvinfo = br_getinfo,
299 .get_link = ethtool_op_get_link,
300};
301
302static const struct net_device_ops br_netdev_ops = {
303 .ndo_open = br_dev_open,
304 .ndo_stop = br_dev_stop,
305 .ndo_init = br_dev_init,
306 .ndo_start_xmit = br_dev_xmit,
307 .ndo_get_stats64 = br_get_stats64,
308 .ndo_set_mac_address = br_set_mac_address,
309 .ndo_set_rx_mode = br_dev_set_multicast_list,
310 .ndo_change_mtu = br_change_mtu,
311 .ndo_do_ioctl = br_dev_ioctl,
312#ifdef CONFIG_NET_POLL_CONTROLLER
313 .ndo_netpoll_setup = br_netpoll_setup,
314 .ndo_netpoll_cleanup = br_netpoll_cleanup,
315 .ndo_poll_controller = br_poll_controller,
316#endif
317 .ndo_add_slave = br_add_slave,
318 .ndo_del_slave = br_del_slave,
319 .ndo_fix_features = br_fix_features,
320 .ndo_fdb_add = br_fdb_add,
321 .ndo_fdb_del = br_fdb_delete,
322 .ndo_fdb_dump = br_fdb_dump,
323};
324
325static 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
333static struct device_type br_type = {
334 .name = "bridge",
335};
336
337void br_dev_setup(struct net_device *dev)
338{
339 struct net_bridge *br = netdev_priv(dev);
340
341 eth_hw_addr_random(dev);
342 ether_setup(dev);
343
344 dev->netdev_ops = &br_netdev_ops;
345 dev->destructor = br_dev_free;
346 SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
347 SET_NETDEV_DEVTYPE(dev, &br_type);
348 dev->tx_queue_len = 0;
349 dev->priv_flags = IFF_EBRIDGE;
350
351 dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
352 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | NETIF_F_LLTX |
353 NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX;
354 dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
355 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
356 NETIF_F_HW_VLAN_TX;
357
358 br->dev = dev;
359 spin_lock_init(&br->lock);
360 INIT_LIST_HEAD(&br->port_list);
361 spin_lock_init(&br->hash_lock);
362
363 br->bridge_id.prio[0] = 0x80;
364 br->bridge_id.prio[1] = 0x00;
365
366 memcpy(br->group_addr, br_group_address, ETH_ALEN);
367
368 br->stp_enabled = BR_NO_STP;
369 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
370
371 br->designated_root = br->bridge_id;
372 br->bridge_max_age = br->max_age = 20 * HZ;
373 br->bridge_hello_time = br->hello_time = 2 * HZ;
374 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
375 br->ageing_time = 300 * HZ;
376
377 br_netfilter_rtable_init(br);
378 br_stp_timer_init(br);
379 br_multicast_init(br);
380}
381
