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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 <linux/uaccess.h>
23#include "br_private.h"
24
25#define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \
26 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM)
27
28const struct nf_br_ops __rcu *nf_br_ops __read_mostly;
29EXPORT_SYMBOL_GPL(nf_br_ops);
30
31static struct lock_class_key bridge_netdev_addr_lock_key;
32
33
34netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
35{
36 struct net_bridge *br = netdev_priv(dev);
37 struct net_bridge_fdb_entry *dst;
38 struct net_bridge_mdb_entry *mdst;
39 struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
40 const struct nf_br_ops *nf_ops;
41 const unsigned char *dest;
42 struct ethhdr *eth;
43 u16 vid = 0;
44
45 rcu_read_lock();
46 nf_ops = rcu_dereference(nf_br_ops);
47 if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
48 rcu_read_unlock();
49 return NETDEV_TX_OK;
50 }
51
52 u64_stats_update_begin(&brstats->syncp);
53 brstats->tx_packets++;
54 brstats->tx_bytes += skb->len;
55 u64_stats_update_end(&brstats->syncp);
56
57 br_switchdev_frame_unmark(skb);
58 BR_INPUT_SKB_CB(skb)->brdev = dev;
59
60 skb_reset_mac_header(skb);
61 eth = eth_hdr(skb);
62 skb_pull(skb, ETH_HLEN);
63
64 if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid))
65 goto out;
66
67 if (IS_ENABLED(CONFIG_INET) &&
68 (eth->h_proto == htons(ETH_P_ARP) ||
69 eth->h_proto == htons(ETH_P_RARP)) &&
70 br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
71 br_do_proxy_suppress_arp(skb, br, vid, NULL);
72 } else if (IS_ENABLED(CONFIG_IPV6) &&
73 skb->protocol == htons(ETH_P_IPV6) &&
74 br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
75 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
76 sizeof(struct nd_msg)) &&
77 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
78 struct nd_msg *msg, _msg;
79
80 msg = br_is_nd_neigh_msg(skb, &_msg);
81 if (msg)
82 br_do_suppress_nd(skb, br, vid, NULL, msg);
83 }
84
85 dest = eth_hdr(skb)->h_dest;
86 if (is_broadcast_ether_addr(dest)) {
87 br_flood(br, skb, BR_PKT_BROADCAST, false, true);
88 } else if (is_multicast_ether_addr(dest)) {
89 if (unlikely(netpoll_tx_running(dev))) {
90 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
91 goto out;
92 }
93 if (br_multicast_rcv(br, NULL, skb, vid)) {
94 kfree_skb(skb);
95 goto out;
96 }
97
98 mdst = br_mdb_get(br, skb, vid);
99 if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
100 br_multicast_querier_exists(br, eth_hdr(skb)))
101 br_multicast_flood(mdst, skb, false, true);
102 else
103 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
104 } else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
105 br_forward(dst->dst, skb, false, true);
106 } else {
107 br_flood(br, skb, BR_PKT_UNICAST, false, true);
108 }
109out:
110 rcu_read_unlock();
111 return NETDEV_TX_OK;
112}
113
114static void br_set_lockdep_class(struct net_device *dev)
115{
116 lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key);
117}
118
119static int br_dev_init(struct net_device *dev)
120{
121 struct net_bridge *br = netdev_priv(dev);
122 int err;
123
124 br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
125 if (!br->stats)
126 return -ENOMEM;
127
128 err = br_fdb_hash_init(br);
129 if (err) {
130 free_percpu(br->stats);
131 return err;
132 }
133
134 err = br_vlan_init(br);
135 if (err) {
136 free_percpu(br->stats);
137 br_fdb_hash_fini(br);
138 return err;
139 }
140
141 err = br_multicast_init_stats(br);
142 if (err) {
143 free_percpu(br->stats);
144 br_vlan_flush(br);
145 br_fdb_hash_fini(br);
146 }
147 br_set_lockdep_class(dev);
148
149 return err;
150}
151
152static void br_dev_uninit(struct net_device *dev)
153{
154 struct net_bridge *br = netdev_priv(dev);
155
156 br_multicast_dev_del(br);
157 br_multicast_uninit_stats(br);
158 br_vlan_flush(br);
159 br_fdb_hash_fini(br);
160 free_percpu(br->stats);
161}
162
163static int br_dev_open(struct net_device *dev)
164{
165 struct net_bridge *br = netdev_priv(dev);
166
167 netdev_update_features(dev);
168 netif_start_queue(dev);
169 br_stp_enable_bridge(br);
170 br_multicast_open(br);
171
172 return 0;
173}
174
175static void br_dev_set_multicast_list(struct net_device *dev)
176{
177}
178
179static void br_dev_change_rx_flags(struct net_device *dev, int change)
180{
181 if (change & IFF_PROMISC)
182 br_manage_promisc(netdev_priv(dev));
183}
184
185static int br_dev_stop(struct net_device *dev)
186{
187 struct net_bridge *br = netdev_priv(dev);
188
189 br_stp_disable_bridge(br);
190 br_multicast_stop(br);
191
192 netif_stop_queue(dev);
193
194 return 0;
195}
196
197static void br_get_stats64(struct net_device *dev,
198 struct rtnl_link_stats64 *stats)
199{
200 struct net_bridge *br = netdev_priv(dev);
201 struct pcpu_sw_netstats tmp, sum = { 0 };
202 unsigned int cpu;
203
204 for_each_possible_cpu(cpu) {
205 unsigned int start;
206 const struct pcpu_sw_netstats *bstats
207 = per_cpu_ptr(br->stats, cpu);
208 do {
209 start = u64_stats_fetch_begin_irq(&bstats->syncp);
210 memcpy(&tmp, bstats, sizeof(tmp));
211 } while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
212 sum.tx_bytes += tmp.tx_bytes;
213 sum.tx_packets += tmp.tx_packets;
214 sum.rx_bytes += tmp.rx_bytes;
215 sum.rx_packets += tmp.rx_packets;
216 }
217
218 stats->tx_bytes = sum.tx_bytes;
219 stats->tx_packets = sum.tx_packets;
220 stats->rx_bytes = sum.rx_bytes;
221 stats->rx_packets = sum.rx_packets;
222}
223
224static int br_change_mtu(struct net_device *dev, int new_mtu)
225{
226 struct net_bridge *br = netdev_priv(dev);
227
228 dev->mtu = new_mtu;
229
230
231 br_opt_toggle(br, BROPT_MTU_SET_BY_USER, true);
232#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
233
234 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
235#endif
236
237 return 0;
238}
239
240
241static int br_set_mac_address(struct net_device *dev, void *p)
242{
243 struct net_bridge *br = netdev_priv(dev);
244 struct sockaddr *addr = p;
245
246 if (!is_valid_ether_addr(addr->sa_data))
247 return -EADDRNOTAVAIL;
248
249 spin_lock_bh(&br->lock);
250 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
251
252 br_stp_change_bridge_id(br, addr->sa_data);
253 }
254 spin_unlock_bh(&br->lock);
255
256 return 0;
257}
258
259static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
260{
261 strlcpy(info->driver, "bridge", sizeof(info->driver));
262 strlcpy(info->version, BR_VERSION, sizeof(info->version));
263 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
264 strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
265}
266
267static netdev_features_t br_fix_features(struct net_device *dev,
268 netdev_features_t features)
269{
270 struct net_bridge *br = netdev_priv(dev);
271
272 return br_features_recompute(br, features);
273}
274
275#ifdef CONFIG_NET_POLL_CONTROLLER
276static void br_poll_controller(struct net_device *br_dev)
277{
278}
279
280static void br_netpoll_cleanup(struct net_device *dev)
281{
282 struct net_bridge *br = netdev_priv(dev);
283 struct net_bridge_port *p;
284
285 list_for_each_entry(p, &br->port_list, list)
286 br_netpoll_disable(p);
287}
288
289static int __br_netpoll_enable(struct net_bridge_port *p)
290{
291 struct netpoll *np;
292 int err;
293
294 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
295 if (!np)
296 return -ENOMEM;
297
298 err = __netpoll_setup(np, p->dev);
299 if (err) {
300 kfree(np);
301 return err;
302 }
303
304 p->np = np;
305 return err;
306}
307
308int br_netpoll_enable(struct net_bridge_port *p)
309{
310 if (!p->br->dev->npinfo)
311 return 0;
312
313 return __br_netpoll_enable(p);
314}
315
316static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
317{
318 struct net_bridge *br = netdev_priv(dev);
319 struct net_bridge_port *p;
320 int err = 0;
321
322 list_for_each_entry(p, &br->port_list, list) {
323 if (!p->dev)
324 continue;
325 err = __br_netpoll_enable(p);
326 if (err)
327 goto fail;
328 }
329
330out:
331 return err;
332
333fail:
334 br_netpoll_cleanup(dev);
335 goto out;
336}
337
338void br_netpoll_disable(struct net_bridge_port *p)
339{
340 struct netpoll *np = p->np;
341
342 if (!np)
343 return;
344
345 p->np = NULL;
346
347 __netpoll_free_async(np);
348}
349
350#endif
351
352static int br_add_slave(struct net_device *dev, struct net_device *slave_dev,
353 struct netlink_ext_ack *extack)
354
355{
356 struct net_bridge *br = netdev_priv(dev);
357
358 return br_add_if(br, slave_dev, extack);
359}
360
361static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
362{
363 struct net_bridge *br = netdev_priv(dev);
364
365 return br_del_if(br, slave_dev);
366}
367
368static const struct ethtool_ops br_ethtool_ops = {
369 .get_drvinfo = br_getinfo,
370 .get_link = ethtool_op_get_link,
371};
372
373static const struct net_device_ops br_netdev_ops = {
374 .ndo_open = br_dev_open,
375 .ndo_stop = br_dev_stop,
376 .ndo_init = br_dev_init,
377 .ndo_uninit = br_dev_uninit,
378 .ndo_start_xmit = br_dev_xmit,
379 .ndo_get_stats64 = br_get_stats64,
380 .ndo_set_mac_address = br_set_mac_address,
381 .ndo_set_rx_mode = br_dev_set_multicast_list,
382 .ndo_change_rx_flags = br_dev_change_rx_flags,
383 .ndo_change_mtu = br_change_mtu,
384 .ndo_do_ioctl = br_dev_ioctl,
385#ifdef CONFIG_NET_POLL_CONTROLLER
386 .ndo_netpoll_setup = br_netpoll_setup,
387 .ndo_netpoll_cleanup = br_netpoll_cleanup,
388 .ndo_poll_controller = br_poll_controller,
389#endif
390 .ndo_add_slave = br_add_slave,
391 .ndo_del_slave = br_del_slave,
392 .ndo_fix_features = br_fix_features,
393 .ndo_fdb_add = br_fdb_add,
394 .ndo_fdb_del = br_fdb_delete,
395 .ndo_fdb_dump = br_fdb_dump,
396 .ndo_bridge_getlink = br_getlink,
397 .ndo_bridge_setlink = br_setlink,
398 .ndo_bridge_dellink = br_dellink,
399 .ndo_features_check = passthru_features_check,
400};
401
402static struct device_type br_type = {
403 .name = "bridge",
404};
405
406void br_dev_setup(struct net_device *dev)
407{
408 struct net_bridge *br = netdev_priv(dev);
409
410 eth_hw_addr_random(dev);
411 ether_setup(dev);
412
413 dev->netdev_ops = &br_netdev_ops;
414 dev->needs_free_netdev = true;
415 dev->ethtool_ops = &br_ethtool_ops;
416 SET_NETDEV_DEVTYPE(dev, &br_type);
417 dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
418
419 dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
420 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
421 dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
422 NETIF_F_HW_VLAN_STAG_TX;
423 dev->vlan_features = COMMON_FEATURES;
424
425 br->dev = dev;
426 spin_lock_init(&br->lock);
427 INIT_LIST_HEAD(&br->port_list);
428 INIT_HLIST_HEAD(&br->fdb_list);
429 spin_lock_init(&br->hash_lock);
430
431 br->bridge_id.prio[0] = 0x80;
432 br->bridge_id.prio[1] = 0x00;
433
434 ether_addr_copy(br->group_addr, eth_stp_addr);
435
436 br->stp_enabled = BR_NO_STP;
437 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
438 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
439
440 br->designated_root = br->bridge_id;
441 br->bridge_max_age = br->max_age = 20 * HZ;
442 br->bridge_hello_time = br->hello_time = 2 * HZ;
443 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
444 br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
445 dev->max_mtu = ETH_MAX_MTU;
446
447 br_netfilter_rtable_init(br);
448 br_stp_timer_init(br);
449 br_multicast_init(br);
450 INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);
451}
452
