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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 const unsigned char *dest;
36 struct ethhdr *eth;
37 u16 vid = 0;
38
39 rcu_read_lock();
40 nf_ops = rcu_dereference(nf_br_ops);
41 if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
42 rcu_read_unlock();
43 return NETDEV_TX_OK;
44 }
45
46 u64_stats_update_begin(&brstats->syncp);
47 brstats->tx_packets++;
48 brstats->tx_bytes += skb->len;
49 u64_stats_update_end(&brstats->syncp);
50
51 br_switchdev_frame_unmark(skb);
52 BR_INPUT_SKB_CB(skb)->brdev = dev;
53 BR_INPUT_SKB_CB(skb)->frag_max_size = 0;
54
55 skb_reset_mac_header(skb);
56 eth = eth_hdr(skb);
57 skb_pull(skb, ETH_HLEN);
58
59 if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid))
60 goto out;
61
62 if (IS_ENABLED(CONFIG_INET) &&
63 (eth->h_proto == htons(ETH_P_ARP) ||
64 eth->h_proto == htons(ETH_P_RARP)) &&
65 br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
66 br_do_proxy_suppress_arp(skb, br, vid, NULL);
67 } else if (IS_ENABLED(CONFIG_IPV6) &&
68 skb->protocol == htons(ETH_P_IPV6) &&
69 br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
70 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
71 sizeof(struct nd_msg)) &&
72 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
73 struct nd_msg *msg, _msg;
74
75 msg = br_is_nd_neigh_msg(skb, &_msg);
76 if (msg)
77 br_do_suppress_nd(skb, br, vid, NULL, msg);
78 }
79
80 dest = eth_hdr(skb)->h_dest;
81 if (is_broadcast_ether_addr(dest)) {
82 br_flood(br, skb, BR_PKT_BROADCAST, false, true);
83 } else if (is_multicast_ether_addr(dest)) {
84 if (unlikely(netpoll_tx_running(dev))) {
85 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
86 goto out;
87 }
88 if (br_multicast_rcv(br, NULL, skb, vid)) {
89 kfree_skb(skb);
90 goto out;
91 }
92
93 mdst = br_mdb_get(br, skb, vid);
94 if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
95 br_multicast_querier_exists(br, eth_hdr(skb)))
96 br_multicast_flood(mdst, skb, false, true);
97 else
98 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
99 } else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
100 br_forward(dst->dst, skb, false, true);
101 } else {
102 br_flood(br, skb, BR_PKT_UNICAST, false, true);
103 }
104out:
105 rcu_read_unlock();
106 return NETDEV_TX_OK;
107}
108
109static int br_dev_init(struct net_device *dev)
110{
111 struct net_bridge *br = netdev_priv(dev);
112 int err;
113
114 br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
115 if (!br->stats)
116 return -ENOMEM;
117
118 err = br_fdb_hash_init(br);
119 if (err) {
120 free_percpu(br->stats);
121 return err;
122 }
123
124 err = br_mdb_hash_init(br);
125 if (err) {
126 free_percpu(br->stats);
127 br_fdb_hash_fini(br);
128 return err;
129 }
130
131 err = br_vlan_init(br);
132 if (err) {
133 free_percpu(br->stats);
134 br_mdb_hash_fini(br);
135 br_fdb_hash_fini(br);
136 return err;
137 }
138
139 err = br_multicast_init_stats(br);
140 if (err) {
141 free_percpu(br->stats);
142 br_vlan_flush(br);
143 br_mdb_hash_fini(br);
144 br_fdb_hash_fini(br);
145 }
146
147 return err;
148}
149
150static void br_dev_uninit(struct net_device *dev)
151{
152 struct net_bridge *br = netdev_priv(dev);
153
154 br_multicast_dev_del(br);
155 br_multicast_uninit_stats(br);
156 br_vlan_flush(br);
157 br_mdb_hash_fini(br);
158 br_fdb_hash_fini(br);
159 free_percpu(br->stats);
160}
161
162static int br_dev_open(struct net_device *dev)
163{
164 struct net_bridge *br = netdev_priv(dev);
165
166 netdev_update_features(dev);
167 netif_start_queue(dev);
168 br_stp_enable_bridge(br);
169 br_multicast_open(br);
170
171 return 0;
172}
173
174static void br_dev_set_multicast_list(struct net_device *dev)
175{
176}
177
178static void br_dev_change_rx_flags(struct net_device *dev, int change)
179{
180 if (change & IFF_PROMISC)
181 br_manage_promisc(netdev_priv(dev));
182}
183
184static int br_dev_stop(struct net_device *dev)
185{
186 struct net_bridge *br = netdev_priv(dev);
187
188 br_stp_disable_bridge(br);
189 br_multicast_stop(br);
190
191 netif_stop_queue(dev);
192
193 return 0;
194}
195
196static void br_get_stats64(struct net_device *dev,
197 struct rtnl_link_stats64 *stats)
198{
199 struct net_bridge *br = netdev_priv(dev);
200 struct pcpu_sw_netstats tmp, sum = { 0 };
201 unsigned int cpu;
202
203 for_each_possible_cpu(cpu) {
204 unsigned int start;
205 const struct pcpu_sw_netstats *bstats
206 = per_cpu_ptr(br->stats, cpu);
207 do {
208 start = u64_stats_fetch_begin_irq(&bstats->syncp);
209 memcpy(&tmp, bstats, sizeof(tmp));
210 } while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
211 sum.tx_bytes += tmp.tx_bytes;
212 sum.tx_packets += tmp.tx_packets;
213 sum.rx_bytes += tmp.rx_bytes;
214 sum.rx_packets += tmp.rx_packets;
215 }
216
217 stats->tx_bytes = sum.tx_bytes;
218 stats->tx_packets = sum.tx_packets;
219 stats->rx_bytes = sum.rx_bytes;
220 stats->rx_packets = sum.rx_packets;
221}
222
223static int br_change_mtu(struct net_device *dev, int new_mtu)
224{
225 struct net_bridge *br = netdev_priv(dev);
226
227 dev->mtu = new_mtu;
228
229
230 br_opt_toggle(br, BROPT_MTU_SET_BY_USER, true);
231#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
232
233 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
234#endif
235
236 return 0;
237}
238
239
240static int br_set_mac_address(struct net_device *dev, void *p)
241{
242 struct net_bridge *br = netdev_priv(dev);
243 struct sockaddr *addr = p;
244
245 if (!is_valid_ether_addr(addr->sa_data))
246 return -EADDRNOTAVAIL;
247
248 spin_lock_bh(&br->lock);
249 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
250
251 br_stp_change_bridge_id(br, addr->sa_data);
252 }
253 spin_unlock_bh(&br->lock);
254
255 return 0;
256}
257
258static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
259{
260 strlcpy(info->driver, "bridge", sizeof(info->driver));
261 strlcpy(info->version, BR_VERSION, sizeof(info->version));
262 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
263 strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
264}
265
266static netdev_features_t br_fix_features(struct net_device *dev,
267 netdev_features_t features)
268{
269 struct net_bridge *br = netdev_priv(dev);
270
271 return br_features_recompute(br, features);
272}
273
274#ifdef CONFIG_NET_POLL_CONTROLLER
275static void br_poll_controller(struct net_device *br_dev)
276{
277}
278
279static void br_netpoll_cleanup(struct net_device *dev)
280{
281 struct net_bridge *br = netdev_priv(dev);
282 struct net_bridge_port *p;
283
284 list_for_each_entry(p, &br->port_list, list)
285 br_netpoll_disable(p);
286}
287
288static int __br_netpoll_enable(struct net_bridge_port *p)
289{
290 struct netpoll *np;
291 int err;
292
293 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
294 if (!np)
295 return -ENOMEM;
296
297 err = __netpoll_setup(np, p->dev);
298 if (err) {
299 kfree(np);
300 return err;
301 }
302
303 p->np = np;
304 return err;
305}
306
307int br_netpoll_enable(struct net_bridge_port *p)
308{
309 if (!p->br->dev->npinfo)
310 return 0;
311
312 return __br_netpoll_enable(p);
313}
314
315static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
316{
317 struct net_bridge *br = netdev_priv(dev);
318 struct net_bridge_port *p;
319 int err = 0;
320
321 list_for_each_entry(p, &br->port_list, list) {
322 if (!p->dev)
323 continue;
324 err = __br_netpoll_enable(p);
325 if (err)
326 goto fail;
327 }
328
329out:
330 return err;
331
332fail:
333 br_netpoll_cleanup(dev);
334 goto out;
335}
336
337void br_netpoll_disable(struct net_bridge_port *p)
338{
339 struct netpoll *np = p->np;
340
341 if (!np)
342 return;
343
344 p->np = NULL;
345
346 __netpoll_free(np);
347}
348
349#endif
350
351static int br_add_slave(struct net_device *dev, struct net_device *slave_dev,
352 struct netlink_ext_ack *extack)
353
354{
355 struct net_bridge *br = netdev_priv(dev);
356
357 return br_add_if(br, slave_dev, extack);
358}
359
360static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
361{
362 struct net_bridge *br = netdev_priv(dev);
363
364 return br_del_if(br, slave_dev);
365}
366
367static const struct ethtool_ops br_ethtool_ops = {
368 .get_drvinfo = br_getinfo,
369 .get_link = ethtool_op_get_link,
370};
371
372static const struct net_device_ops br_netdev_ops = {
373 .ndo_open = br_dev_open,
374 .ndo_stop = br_dev_stop,
375 .ndo_init = br_dev_init,
376 .ndo_uninit = br_dev_uninit,
377 .ndo_start_xmit = br_dev_xmit,
378 .ndo_get_stats64 = br_get_stats64,
379 .ndo_set_mac_address = br_set_mac_address,
380 .ndo_set_rx_mode = br_dev_set_multicast_list,
381 .ndo_change_rx_flags = br_dev_change_rx_flags,
382 .ndo_change_mtu = br_change_mtu,
383 .ndo_do_ioctl = br_dev_ioctl,
384#ifdef CONFIG_NET_POLL_CONTROLLER
385 .ndo_netpoll_setup = br_netpoll_setup,
386 .ndo_netpoll_cleanup = br_netpoll_cleanup,
387 .ndo_poll_controller = br_poll_controller,
388#endif
389 .ndo_add_slave = br_add_slave,
390 .ndo_del_slave = br_del_slave,
391 .ndo_fix_features = br_fix_features,
392 .ndo_fdb_add = br_fdb_add,
393 .ndo_fdb_del = br_fdb_delete,
394 .ndo_fdb_dump = br_fdb_dump,
395 .ndo_fdb_get = br_fdb_get,
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
