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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 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, vid);
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, vid)) != NULL)
75 br_deliver(dst->dst, skb);
76 else
77 br_flood_deliver(br, skb);
78
79out:
80 rcu_read_unlock();
81 return NETDEV_TX_OK;
82}
83
84static 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
95static 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
107static void br_dev_set_multicast_list(struct net_device *dev)
108{
109}
110
111static 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
123static 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
152static 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
162 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
163#endif
164
165 return 0;
166}
167
168
169static 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
188static 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
196static 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
205static void br_poll_controller(struct net_device *br_dev)
206{
207}
208
209static 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
218static 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
233out:
234 return err;
235
236fail:
237 br_netpoll_cleanup(dev);
238 goto out;
239}
240
241int 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
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 __netpoll_free_async(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 .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
323static 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
331static struct device_type br_type = {
332 .name = "bridge",
333};
334
335void 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_CTAG_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_CTAG_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}
379
