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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_mcast_port *pmctx_null = NULL;
31 struct net_bridge *br = netdev_priv(dev);
32 struct net_bridge_mcast *brmctx = &br->multicast_ctx;
33 struct net_bridge_fdb_entry *dst;
34 struct net_bridge_mdb_entry *mdst;
35 const struct nf_br_ops *nf_ops;
36 u8 state = BR_STATE_FORWARDING;
37 struct net_bridge_vlan *vlan;
38 const unsigned char *dest;
39 u16 vid = 0;
40
41 memset(skb->cb, 0, sizeof(struct br_input_skb_cb));
42
43 rcu_read_lock();
44 nf_ops = rcu_dereference(nf_br_ops);
45 if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
46 rcu_read_unlock();
47 return NETDEV_TX_OK;
48 }
49
50 dev_sw_netstats_tx_add(dev, 1, skb->len);
51
52 br_switchdev_frame_unmark(skb);
53 BR_INPUT_SKB_CB(skb)->brdev = dev;
54 BR_INPUT_SKB_CB(skb)->frag_max_size = 0;
55
56 skb_reset_mac_header(skb);
57 skb_pull(skb, ETH_HLEN);
58
59 if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid,
60 &state, &vlan))
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(&brmctx, &pmctx_null, vlan, skb, vid)) {
90 kfree_skb(skb);
91 goto out;
92 }
93
94 mdst = br_mdb_get(brmctx, skb, vid);
95 if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
96 br_multicast_querier_exists(brmctx, eth_hdr(skb), mdst))
97 br_multicast_flood(mdst, skb, brmctx, 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 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
123 if (!dev->tstats)
124 return -ENOMEM;
125
126 err = br_fdb_hash_init(br);
127 if (err) {
128 free_percpu(dev->tstats);
129 return err;
130 }
131
132 err = br_mdb_hash_init(br);
133 if (err) {
134 free_percpu(dev->tstats);
135 br_fdb_hash_fini(br);
136 return err;
137 }
138
139 err = br_vlan_init(br);
140 if (err) {
141 free_percpu(dev->tstats);
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(dev->tstats);
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(dev->tstats);
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 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
181 br_multicast_join_snoopers(br);
182
183 return 0;
184}
185
186static void br_dev_set_multicast_list(struct net_device *dev)
187{
188}
189
190static void br_dev_change_rx_flags(struct net_device *dev, int change)
191{
192 if (change & IFF_PROMISC)
193 br_manage_promisc(netdev_priv(dev));
194}
195
196static int br_dev_stop(struct net_device *dev)
197{
198 struct net_bridge *br = netdev_priv(dev);
199
200 br_stp_disable_bridge(br);
201 br_multicast_stop(br);
202
203 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
204 br_multicast_leave_snoopers(br);
205
206 netif_stop_queue(dev);
207
208 return 0;
209}
210
211static int br_change_mtu(struct net_device *dev, int new_mtu)
212{
213 struct net_bridge *br = netdev_priv(dev);
214
215 dev->mtu = new_mtu;
216
217
218 br_opt_toggle(br, BROPT_MTU_SET_BY_USER, true);
219#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
220
221 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
222#endif
223
224 return 0;
225}
226
227
228static int br_set_mac_address(struct net_device *dev, void *p)
229{
230 struct net_bridge *br = netdev_priv(dev);
231 struct sockaddr *addr = p;
232
233 if (!is_valid_ether_addr(addr->sa_data))
234 return -EADDRNOTAVAIL;
235
236
237
238
239 if (dev->reg_state != NETREG_REGISTERED)
240 return -EBUSY;
241
242 spin_lock_bh(&br->lock);
243 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
244
245 br_stp_change_bridge_id(br, addr->sa_data);
246 }
247 spin_unlock_bh(&br->lock);
248
249 return 0;
250}
251
252static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
253{
254 strlcpy(info->driver, "bridge", sizeof(info->driver));
255 strlcpy(info->version, BR_VERSION, sizeof(info->version));
256 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
257 strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
258}
259
260static int br_get_link_ksettings(struct net_device *dev,
261 struct ethtool_link_ksettings *cmd)
262{
263 struct net_bridge *br = netdev_priv(dev);
264 struct net_bridge_port *p;
265
266 cmd->base.duplex = DUPLEX_UNKNOWN;
267 cmd->base.port = PORT_OTHER;
268 cmd->base.speed = SPEED_UNKNOWN;
269
270 list_for_each_entry(p, &br->port_list, list) {
271 struct ethtool_link_ksettings ecmd;
272 struct net_device *pdev = p->dev;
273
274 if (!netif_running(pdev) || !netif_oper_up(pdev))
275 continue;
276
277 if (__ethtool_get_link_ksettings(pdev, &ecmd))
278 continue;
279
280 if (ecmd.base.speed == (__u32)SPEED_UNKNOWN)
281 continue;
282
283 if (cmd->base.speed == (__u32)SPEED_UNKNOWN ||
284 cmd->base.speed < ecmd.base.speed)
285 cmd->base.speed = ecmd.base.speed;
286 }
287
288 return 0;
289}
290
291static netdev_features_t br_fix_features(struct net_device *dev,
292 netdev_features_t features)
293{
294 struct net_bridge *br = netdev_priv(dev);
295
296 return br_features_recompute(br, features);
297}
298
299#ifdef CONFIG_NET_POLL_CONTROLLER
300static void br_poll_controller(struct net_device *br_dev)
301{
302}
303
304static void br_netpoll_cleanup(struct net_device *dev)
305{
306 struct net_bridge *br = netdev_priv(dev);
307 struct net_bridge_port *p;
308
309 list_for_each_entry(p, &br->port_list, list)
310 br_netpoll_disable(p);
311}
312
313static int __br_netpoll_enable(struct net_bridge_port *p)
314{
315 struct netpoll *np;
316 int err;
317
318 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
319 if (!np)
320 return -ENOMEM;
321
322 err = __netpoll_setup(np, p->dev);
323 if (err) {
324 kfree(np);
325 return err;
326 }
327
328 p->np = np;
329 return err;
330}
331
332int br_netpoll_enable(struct net_bridge_port *p)
333{
334 if (!p->br->dev->npinfo)
335 return 0;
336
337 return __br_netpoll_enable(p);
338}
339
340static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
341{
342 struct net_bridge *br = netdev_priv(dev);
343 struct net_bridge_port *p;
344 int err = 0;
345
346 list_for_each_entry(p, &br->port_list, list) {
347 if (!p->dev)
348 continue;
349 err = __br_netpoll_enable(p);
350 if (err)
351 goto fail;
352 }
353
354out:
355 return err;
356
357fail:
358 br_netpoll_cleanup(dev);
359 goto out;
360}
361
362void br_netpoll_disable(struct net_bridge_port *p)
363{
364 struct netpoll *np = p->np;
365
366 if (!np)
367 return;
368
369 p->np = NULL;
370
371 __netpoll_free(np);
372}
373
374#endif
375
376static int br_add_slave(struct net_device *dev, struct net_device *slave_dev,
377 struct netlink_ext_ack *extack)
378
379{
380 struct net_bridge *br = netdev_priv(dev);
381
382 return br_add_if(br, slave_dev, extack);
383}
384
385static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
386{
387 struct net_bridge *br = netdev_priv(dev);
388
389 return br_del_if(br, slave_dev);
390}
391
392static int br_fill_forward_path(struct net_device_path_ctx *ctx,
393 struct net_device_path *path)
394{
395 struct net_bridge_fdb_entry *f;
396 struct net_bridge_port *dst;
397 struct net_bridge *br;
398
399 if (netif_is_bridge_port(ctx->dev))
400 return -1;
401
402 br = netdev_priv(ctx->dev);
403
404 br_vlan_fill_forward_path_pvid(br, ctx, path);
405
406 f = br_fdb_find_rcu(br, ctx->daddr, path->bridge.vlan_id);
407 if (!f || !f->dst)
408 return -1;
409
410 dst = READ_ONCE(f->dst);
411 if (!dst)
412 return -1;
413
414 if (br_vlan_fill_forward_path_mode(br, dst, path))
415 return -1;
416
417 path->type = DEV_PATH_BRIDGE;
418 path->dev = dst->br->dev;
419 ctx->dev = dst->dev;
420
421 switch (path->bridge.vlan_mode) {
422 case DEV_PATH_BR_VLAN_TAG:
423 if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
424 return -ENOSPC;
425 ctx->vlan[ctx->num_vlans].id = path->bridge.vlan_id;
426 ctx->vlan[ctx->num_vlans].proto = path->bridge.vlan_proto;
427 ctx->num_vlans++;
428 break;
429 case DEV_PATH_BR_VLAN_UNTAG_HW:
430 case DEV_PATH_BR_VLAN_UNTAG:
431 ctx->num_vlans--;
432 break;
433 case DEV_PATH_BR_VLAN_KEEP:
434 break;
435 }
436
437 return 0;
438}
439
440static const struct ethtool_ops br_ethtool_ops = {
441 .get_drvinfo = br_getinfo,
442 .get_link = ethtool_op_get_link,
443 .get_link_ksettings = br_get_link_ksettings,
444};
445
446static const struct net_device_ops br_netdev_ops = {
447 .ndo_open = br_dev_open,
448 .ndo_stop = br_dev_stop,
449 .ndo_init = br_dev_init,
450 .ndo_uninit = br_dev_uninit,
451 .ndo_start_xmit = br_dev_xmit,
452 .ndo_get_stats64 = dev_get_tstats64,
453 .ndo_set_mac_address = br_set_mac_address,
454 .ndo_set_rx_mode = br_dev_set_multicast_list,
455 .ndo_change_rx_flags = br_dev_change_rx_flags,
456 .ndo_change_mtu = br_change_mtu,
457 .ndo_siocdevprivate = br_dev_siocdevprivate,
458#ifdef CONFIG_NET_POLL_CONTROLLER
459 .ndo_netpoll_setup = br_netpoll_setup,
460 .ndo_netpoll_cleanup = br_netpoll_cleanup,
461 .ndo_poll_controller = br_poll_controller,
462#endif
463 .ndo_add_slave = br_add_slave,
464 .ndo_del_slave = br_del_slave,
465 .ndo_fix_features = br_fix_features,
466 .ndo_fdb_add = br_fdb_add,
467 .ndo_fdb_del = br_fdb_delete,
468 .ndo_fdb_del_bulk = br_fdb_delete_bulk,
469 .ndo_fdb_dump = br_fdb_dump,
470 .ndo_fdb_get = br_fdb_get,
471 .ndo_bridge_getlink = br_getlink,
472 .ndo_bridge_setlink = br_setlink,
473 .ndo_bridge_dellink = br_dellink,
474 .ndo_features_check = passthru_features_check,
475 .ndo_fill_forward_path = br_fill_forward_path,
476};
477
478static struct device_type br_type = {
479 .name = "bridge",
480};
481
482void br_dev_setup(struct net_device *dev)
483{
484 struct net_bridge *br = netdev_priv(dev);
485
486 eth_hw_addr_random(dev);
487 ether_setup(dev);
488
489 dev->netdev_ops = &br_netdev_ops;
490 dev->needs_free_netdev = true;
491 dev->ethtool_ops = &br_ethtool_ops;
492 SET_NETDEV_DEVTYPE(dev, &br_type);
493 dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
494
495 dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
496 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
497 dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
498 NETIF_F_HW_VLAN_STAG_TX;
499 dev->vlan_features = COMMON_FEATURES;
500
501 br->dev = dev;
502 spin_lock_init(&br->lock);
503 INIT_LIST_HEAD(&br->port_list);
504 INIT_HLIST_HEAD(&br->fdb_list);
505 INIT_HLIST_HEAD(&br->frame_type_list);
506#if IS_ENABLED(CONFIG_BRIDGE_MRP)
507 INIT_HLIST_HEAD(&br->mrp_list);
508#endif
509#if IS_ENABLED(CONFIG_BRIDGE_CFM)
510 INIT_HLIST_HEAD(&br->mep_list);
511#endif
512 spin_lock_init(&br->hash_lock);
513
514 br->bridge_id.prio[0] = 0x80;
515 br->bridge_id.prio[1] = 0x00;
516
517 ether_addr_copy(br->group_addr, eth_stp_addr);
518
519 br->stp_enabled = BR_NO_STP;
520 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
521 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
522
523 br->designated_root = br->bridge_id;
524 br->bridge_max_age = br->max_age = 20 * HZ;
525 br->bridge_hello_time = br->hello_time = 2 * HZ;
526 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
527 br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
528 dev->max_mtu = ETH_MAX_MTU;
529
530 br_netfilter_rtable_init(br);
531 br_stp_timer_init(br);
532 br_multicast_init(br);
533 INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);
534}
535
