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10#include <linux/kernel.h>
11#include <linux/netdevice.h>
12#include <linux/netpoll.h>
13#include <linux/etherdevice.h>
14#include <linux/ethtool.h>
15#include <linux/list.h>
16#include <linux/netfilter_bridge.h>
17
18#include <linux/uaccess.h>
19#include "br_private.h"
20
21#define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \
22 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM)
23
24const struct nf_br_ops __rcu *nf_br_ops __read_mostly;
25EXPORT_SYMBOL_GPL(nf_br_ops);
26
27
28netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
29{
30 struct net_bridge *br = netdev_priv(dev);
31 struct net_bridge_fdb_entry *dst;
32 struct net_bridge_mdb_entry *mdst;
33 struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
34 const struct nf_br_ops *nf_ops;
35 u8 state = BR_STATE_FORWARDING;
36 const unsigned char *dest;
37 u16 vid = 0;
38
39 memset(skb->cb, 0, sizeof(struct br_input_skb_cb));
40
41 rcu_read_lock();
42 nf_ops = rcu_dereference(nf_br_ops);
43 if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
44 rcu_read_unlock();
45 return NETDEV_TX_OK;
46 }
47
48 u64_stats_update_begin(&brstats->syncp);
49 brstats->tx_packets++;
50 brstats->tx_bytes += skb->len;
51 u64_stats_update_end(&brstats->syncp);
52
53 br_switchdev_frame_unmark(skb);
54 BR_INPUT_SKB_CB(skb)->brdev = dev;
55 BR_INPUT_SKB_CB(skb)->frag_max_size = 0;
56
57 skb_reset_mac_header(skb);
58 skb_pull(skb, ETH_HLEN);
59
60 if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid, &state))
61 goto out;
62
63 if (IS_ENABLED(CONFIG_INET) &&
64 (eth_hdr(skb)->h_proto == htons(ETH_P_ARP) ||
65 eth_hdr(skb)->h_proto == htons(ETH_P_RARP)) &&
66 br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
67 br_do_proxy_suppress_arp(skb, br, vid, NULL);
68 } else if (IS_ENABLED(CONFIG_IPV6) &&
69 skb->protocol == htons(ETH_P_IPV6) &&
70 br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
71 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
72 sizeof(struct nd_msg)) &&
73 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
74 struct nd_msg *msg, _msg;
75
76 msg = br_is_nd_neigh_msg(skb, &_msg);
77 if (msg)
78 br_do_suppress_nd(skb, br, vid, NULL, msg);
79 }
80
81 dest = eth_hdr(skb)->h_dest;
82 if (is_broadcast_ether_addr(dest)) {
83 br_flood(br, skb, BR_PKT_BROADCAST, false, true);
84 } else if (is_multicast_ether_addr(dest)) {
85 if (unlikely(netpoll_tx_running(dev))) {
86 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
87 goto out;
88 }
89 if (br_multicast_rcv(br, NULL, skb, vid)) {
90 kfree_skb(skb);
91 goto out;
92 }
93
94 mdst = br_mdb_get(br, skb, vid);
95 if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
96 br_multicast_querier_exists(br, eth_hdr(skb)))
97 br_multicast_flood(mdst, skb, false, true);
98 else
99 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
100 } else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
101 br_forward(dst->dst, skb, false, true);
102 } else {
103 br_flood(br, skb, BR_PKT_UNICAST, false, true);
104 }
105out:
106 rcu_read_unlock();
107 return NETDEV_TX_OK;
108}
109
110static struct lock_class_key bridge_netdev_addr_lock_key;
111
112static void br_set_lockdep_class(struct net_device *dev)
113{
114 lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key);
115}
116
117static int br_dev_init(struct net_device *dev)
118{
119 struct net_bridge *br = netdev_priv(dev);
120 int err;
121
122 br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
123 if (!br->stats)
124 return -ENOMEM;
125
126 err = br_fdb_hash_init(br);
127 if (err) {
128 free_percpu(br->stats);
129 return err;
130 }
131
132 err = br_mdb_hash_init(br);
133 if (err) {
134 free_percpu(br->stats);
135 br_fdb_hash_fini(br);
136 return err;
137 }
138
139 err = br_vlan_init(br);
140 if (err) {
141 free_percpu(br->stats);
142 br_mdb_hash_fini(br);
143 br_fdb_hash_fini(br);
144 return err;
145 }
146
147 err = br_multicast_init_stats(br);
148 if (err) {
149 free_percpu(br->stats);
150 br_vlan_flush(br);
151 br_mdb_hash_fini(br);
152 br_fdb_hash_fini(br);
153 }
154
155 br_set_lockdep_class(dev);
156 return err;
157}
158
159static void br_dev_uninit(struct net_device *dev)
160{
161 struct net_bridge *br = netdev_priv(dev);
162
163 br_multicast_dev_del(br);
164 br_multicast_uninit_stats(br);
165 br_vlan_flush(br);
166 br_mdb_hash_fini(br);
167 br_fdb_hash_fini(br);
168 free_percpu(br->stats);
169}
170
171static int br_dev_open(struct net_device *dev)
172{
173 struct net_bridge *br = netdev_priv(dev);
174
175 netdev_update_features(dev);
176 netif_start_queue(dev);
177 br_stp_enable_bridge(br);
178 br_multicast_open(br);
179
180 return 0;
181}
182
183static void br_dev_set_multicast_list(struct net_device *dev)
184{
185}
186
187static void br_dev_change_rx_flags(struct net_device *dev, int change)
188{
189 if (change & IFF_PROMISC)
190 br_manage_promisc(netdev_priv(dev));
191}
192
193static int br_dev_stop(struct net_device *dev)
194{
195 struct net_bridge *br = netdev_priv(dev);
196
197 br_stp_disable_bridge(br);
198 br_multicast_stop(br);
199
200 netif_stop_queue(dev);
201
202 return 0;
203}
204
205static void br_get_stats64(struct net_device *dev,
206 struct rtnl_link_stats64 *stats)
207{
208 struct net_bridge *br = netdev_priv(dev);
209 struct pcpu_sw_netstats tmp, sum = { 0 };
210 unsigned int cpu;
211
212 for_each_possible_cpu(cpu) {
213 unsigned int start;
214 const struct pcpu_sw_netstats *bstats
215 = per_cpu_ptr(br->stats, cpu);
216 do {
217 start = u64_stats_fetch_begin_irq(&bstats->syncp);
218 memcpy(&tmp, bstats, sizeof(tmp));
219 } while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
220 sum.tx_bytes += tmp.tx_bytes;
221 sum.tx_packets += tmp.tx_packets;
222 sum.rx_bytes += tmp.rx_bytes;
223 sum.rx_packets += tmp.rx_packets;
224 }
225
226 stats->tx_bytes = sum.tx_bytes;
227 stats->tx_packets = sum.tx_packets;
228 stats->rx_bytes = sum.rx_bytes;
229 stats->rx_packets = sum.rx_packets;
230}
231
232static int br_change_mtu(struct net_device *dev, int new_mtu)
233{
234 struct net_bridge *br = netdev_priv(dev);
235
236 dev->mtu = new_mtu;
237
238
239 br_opt_toggle(br, BROPT_MTU_SET_BY_USER, true);
240#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
241
242 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
243#endif
244
245 return 0;
246}
247
248
249static int br_set_mac_address(struct net_device *dev, void *p)
250{
251 struct net_bridge *br = netdev_priv(dev);
252 struct sockaddr *addr = p;
253
254 if (!is_valid_ether_addr(addr->sa_data))
255 return -EADDRNOTAVAIL;
256
257
258
259
260 if (dev->reg_state != NETREG_REGISTERED)
261 return -EBUSY;
262
263 spin_lock_bh(&br->lock);
264 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
265
266 br_stp_change_bridge_id(br, addr->sa_data);
267 }
268 spin_unlock_bh(&br->lock);
269
270 return 0;
271}
272
273static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
274{
275 strlcpy(info->driver, "bridge", sizeof(info->driver));
276 strlcpy(info->version, BR_VERSION, sizeof(info->version));
277 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
278 strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
279}
280
281static int br_get_link_ksettings(struct net_device *dev,
282 struct ethtool_link_ksettings *cmd)
283{
284 struct net_bridge *br = netdev_priv(dev);
285 struct net_bridge_port *p;
286
287 cmd->base.duplex = DUPLEX_UNKNOWN;
288 cmd->base.port = PORT_OTHER;
289 cmd->base.speed = SPEED_UNKNOWN;
290
291 list_for_each_entry(p, &br->port_list, list) {
292 struct ethtool_link_ksettings ecmd;
293 struct net_device *pdev = p->dev;
294
295 if (!netif_running(pdev) || !netif_oper_up(pdev))
296 continue;
297
298 if (__ethtool_get_link_ksettings(pdev, &ecmd))
299 continue;
300
301 if (ecmd.base.speed == (__u32)SPEED_UNKNOWN)
302 continue;
303
304 if (cmd->base.speed == (__u32)SPEED_UNKNOWN ||
305 cmd->base.speed < ecmd.base.speed)
306 cmd->base.speed = ecmd.base.speed;
307 }
308
309 return 0;
310}
311
312static netdev_features_t br_fix_features(struct net_device *dev,
313 netdev_features_t features)
314{
315 struct net_bridge *br = netdev_priv(dev);
316
317 return br_features_recompute(br, features);
318}
319
320#ifdef CONFIG_NET_POLL_CONTROLLER
321static void br_poll_controller(struct net_device *br_dev)
322{
323}
324
325static void br_netpoll_cleanup(struct net_device *dev)
326{
327 struct net_bridge *br = netdev_priv(dev);
328 struct net_bridge_port *p;
329
330 list_for_each_entry(p, &br->port_list, list)
331 br_netpoll_disable(p);
332}
333
334static int __br_netpoll_enable(struct net_bridge_port *p)
335{
336 struct netpoll *np;
337 int err;
338
339 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
340 if (!np)
341 return -ENOMEM;
342
343 err = __netpoll_setup(np, p->dev);
344 if (err) {
345 kfree(np);
346 return err;
347 }
348
349 p->np = np;
350 return err;
351}
352
353int br_netpoll_enable(struct net_bridge_port *p)
354{
355 if (!p->br->dev->npinfo)
356 return 0;
357
358 return __br_netpoll_enable(p);
359}
360
361static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
362{
363 struct net_bridge *br = netdev_priv(dev);
364 struct net_bridge_port *p;
365 int err = 0;
366
367 list_for_each_entry(p, &br->port_list, list) {
368 if (!p->dev)
369 continue;
370 err = __br_netpoll_enable(p);
371 if (err)
372 goto fail;
373 }
374
375out:
376 return err;
377
378fail:
379 br_netpoll_cleanup(dev);
380 goto out;
381}
382
383void br_netpoll_disable(struct net_bridge_port *p)
384{
385 struct netpoll *np = p->np;
386
387 if (!np)
388 return;
389
390 p->np = NULL;
391
392 __netpoll_free(np);
393}
394
395#endif
396
397static int br_add_slave(struct net_device *dev, struct net_device *slave_dev,
398 struct netlink_ext_ack *extack)
399
400{
401 struct net_bridge *br = netdev_priv(dev);
402
403 return br_add_if(br, slave_dev, extack);
404}
405
406static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
407{
408 struct net_bridge *br = netdev_priv(dev);
409
410 return br_del_if(br, slave_dev);
411}
412
413static const struct ethtool_ops br_ethtool_ops = {
414 .get_drvinfo = br_getinfo,
415 .get_link = ethtool_op_get_link,
416 .get_link_ksettings = br_get_link_ksettings,
417};
418
419static const struct net_device_ops br_netdev_ops = {
420 .ndo_open = br_dev_open,
421 .ndo_stop = br_dev_stop,
422 .ndo_init = br_dev_init,
423 .ndo_uninit = br_dev_uninit,
424 .ndo_start_xmit = br_dev_xmit,
425 .ndo_get_stats64 = br_get_stats64,
426 .ndo_set_mac_address = br_set_mac_address,
427 .ndo_set_rx_mode = br_dev_set_multicast_list,
428 .ndo_change_rx_flags = br_dev_change_rx_flags,
429 .ndo_change_mtu = br_change_mtu,
430 .ndo_do_ioctl = br_dev_ioctl,
431#ifdef CONFIG_NET_POLL_CONTROLLER
432 .ndo_netpoll_setup = br_netpoll_setup,
433 .ndo_netpoll_cleanup = br_netpoll_cleanup,
434 .ndo_poll_controller = br_poll_controller,
435#endif
436 .ndo_add_slave = br_add_slave,
437 .ndo_del_slave = br_del_slave,
438 .ndo_fix_features = br_fix_features,
439 .ndo_fdb_add = br_fdb_add,
440 .ndo_fdb_del = br_fdb_delete,
441 .ndo_fdb_dump = br_fdb_dump,
442 .ndo_fdb_get = br_fdb_get,
443 .ndo_bridge_getlink = br_getlink,
444 .ndo_bridge_setlink = br_setlink,
445 .ndo_bridge_dellink = br_dellink,
446 .ndo_features_check = passthru_features_check,
447};
448
449static struct device_type br_type = {
450 .name = "bridge",
451};
452
453void br_dev_setup(struct net_device *dev)
454{
455 struct net_bridge *br = netdev_priv(dev);
456
457 eth_hw_addr_random(dev);
458 ether_setup(dev);
459
460 dev->netdev_ops = &br_netdev_ops;
461 dev->needs_free_netdev = true;
462 dev->ethtool_ops = &br_ethtool_ops;
463 SET_NETDEV_DEVTYPE(dev, &br_type);
464 dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
465
466 dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
467 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
468 dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
469 NETIF_F_HW_VLAN_STAG_TX;
470 dev->vlan_features = COMMON_FEATURES;
471
472 br->dev = dev;
473 spin_lock_init(&br->lock);
474 INIT_LIST_HEAD(&br->port_list);
475 INIT_HLIST_HEAD(&br->fdb_list);
476#if IS_ENABLED(CONFIG_BRIDGE_MRP)
477 INIT_LIST_HEAD(&br->mrp_list);
478#endif
479 spin_lock_init(&br->hash_lock);
480
481 br->bridge_id.prio[0] = 0x80;
482 br->bridge_id.prio[1] = 0x00;
483
484 ether_addr_copy(br->group_addr, eth_stp_addr);
485
486 br->stp_enabled = BR_NO_STP;
487 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
488 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
489
490 br->designated_root = br->bridge_id;
491 br->bridge_max_age = br->max_age = 20 * HZ;
492 br->bridge_hello_time = br->hello_time = 2 * HZ;
493 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
494 br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
495 dev->max_mtu = ETH_MAX_MTU;
496
497 br_netfilter_rtable_init(br);
498 br_stp_timer_init(br);
499 br_multicast_init(br);
500 INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);
501}
502
