Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Userspace interface | |
4 | * Linux ethernet bridge | |
5 | * | |
6 | * Authors: | |
7 | * Lennert Buytenhek <buytenh@gnu.org> | |
1da177e4 LT |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/netdevice.h> | |
77f98598 | 12 | #include <linux/etherdevice.h> |
c06ee961 | 13 | #include <linux/netpoll.h> |
1da177e4 LT |
14 | #include <linux/ethtool.h> |
15 | #include <linux/if_arp.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/rtnetlink.h> | |
46f25dff | 19 | #include <linux/if_ether.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
c6e970a0 | 21 | #include <net/dsa.h> |
1da177e4 | 22 | #include <net/sock.h> |
407af329 | 23 | #include <linux/if_vlan.h> |
56607386 | 24 | #include <net/switchdev.h> |
705e0dea | 25 | #include <net/net_namespace.h> |
1da177e4 LT |
26 | |
27 | #include "br_private.h" | |
28 | ||
29 | /* | |
30 | * Determine initial path cost based on speed. | |
31 | * using recommendations from 802.1d standard | |
32 | * | |
61a44b9c | 33 | * Since driver might sleep need to not be holding any locks. |
1da177e4 | 34 | */ |
4433f420 | 35 | static int port_cost(struct net_device *dev) |
1da177e4 | 36 | { |
702b26a2 | 37 | struct ethtool_link_ksettings ecmd; |
b4a488d1 | 38 | |
702b26a2 DD |
39 | if (!__ethtool_get_link_ksettings(dev, &ecmd)) { |
40 | switch (ecmd.base.speed) { | |
fa3df928 JP |
41 | case SPEED_10000: |
42 | return 2; | |
43 | case SPEED_1000: | |
44 | return 4; | |
45 | case SPEED_100: | |
46 | return 19; | |
47 | case SPEED_10: | |
48 | return 100; | |
1da177e4 LT |
49 | } |
50 | } | |
51 | ||
52 | /* Old silly heuristics based on name */ | |
53 | if (!strncmp(dev->name, "lec", 3)) | |
54 | return 7; | |
55 | ||
56 | if (!strncmp(dev->name, "plip", 4)) | |
57 | return 2500; | |
58 | ||
59 | return 100; /* assume old 10Mbps */ | |
60 | } | |
61 | ||
4433f420 | 62 | |
1a81a2e0 | 63 | /* Check for port carrier transitions. */ |
faa1cd82 | 64 | void br_port_carrier_check(struct net_bridge_port *p, bool *notified) |
4433f420 | 65 | { |
269def7c SH |
66 | struct net_device *dev = p->dev; |
67 | struct net_bridge *br = p->br; | |
6e86b890 | 68 | |
8f3359bd | 69 | if (!(p->flags & BR_ADMIN_COST) && |
70 | netif_running(dev) && netif_oper_up(dev)) | |
6e86b890 SH |
71 | p->path_cost = port_cost(dev); |
72 | ||
faa1cd82 | 73 | *notified = false; |
aa7c6e5f | 74 | if (!netif_running(br->dev)) |
75 | return; | |
76 | ||
77 | spin_lock_bh(&br->lock); | |
576eb625 | 78 | if (netif_running(dev) && netif_oper_up(dev)) { |
faa1cd82 | 79 | if (p->state == BR_STATE_DISABLED) { |
aa7c6e5f | 80 | br_stp_enable_port(p); |
faa1cd82 NA |
81 | *notified = true; |
82 | } | |
aa7c6e5f | 83 | } else { |
faa1cd82 | 84 | if (p->state != BR_STATE_DISABLED) { |
aa7c6e5f | 85 | br_stp_disable_port(p); |
faa1cd82 NA |
86 | *notified = true; |
87 | } | |
4433f420 | 88 | } |
aa7c6e5f | 89 | spin_unlock_bh(&br->lock); |
4433f420 SH |
90 | } |
91 | ||
2796d0c6 VY |
92 | static void br_port_set_promisc(struct net_bridge_port *p) |
93 | { | |
94 | int err = 0; | |
95 | ||
96 | if (br_promisc_port(p)) | |
97 | return; | |
98 | ||
99 | err = dev_set_promiscuity(p->dev, 1); | |
100 | if (err) | |
101 | return; | |
102 | ||
103 | br_fdb_unsync_static(p->br, p); | |
104 | p->flags |= BR_PROMISC; | |
105 | } | |
106 | ||
107 | static void br_port_clear_promisc(struct net_bridge_port *p) | |
108 | { | |
109 | int err; | |
110 | ||
111 | /* Check if the port is already non-promisc or if it doesn't | |
112 | * support UNICAST filtering. Without unicast filtering support | |
113 | * we'll end up re-enabling promisc mode anyway, so just check for | |
114 | * it here. | |
115 | */ | |
116 | if (!br_promisc_port(p) || !(p->dev->priv_flags & IFF_UNICAST_FLT)) | |
117 | return; | |
118 | ||
119 | /* Since we'll be clearing the promisc mode, program the port | |
120 | * first so that we don't have interruption in traffic. | |
121 | */ | |
122 | err = br_fdb_sync_static(p->br, p); | |
123 | if (err) | |
124 | return; | |
125 | ||
126 | dev_set_promiscuity(p->dev, -1); | |
127 | p->flags &= ~BR_PROMISC; | |
128 | } | |
129 | ||
130 | /* When a port is added or removed or when certain port flags | |
131 | * change, this function is called to automatically manage | |
132 | * promiscuity setting of all the bridge ports. We are always called | |
133 | * under RTNL so can skip using rcu primitives. | |
134 | */ | |
135 | void br_manage_promisc(struct net_bridge *br) | |
136 | { | |
137 | struct net_bridge_port *p; | |
138 | bool set_all = false; | |
139 | ||
140 | /* If vlan filtering is disabled or bridge interface is placed | |
141 | * into promiscuous mode, place all ports in promiscuous mode. | |
142 | */ | |
1f51445a | 143 | if ((br->dev->flags & IFF_PROMISC) || !br_vlan_enabled(br->dev)) |
2796d0c6 VY |
144 | set_all = true; |
145 | ||
146 | list_for_each_entry(p, &br->port_list, list) { | |
147 | if (set_all) { | |
148 | br_port_set_promisc(p); | |
149 | } else { | |
150 | /* If the number of auto-ports is <= 1, then all other | |
151 | * ports will have their output configuration | |
152 | * statically specified through fdbs. Since ingress | |
153 | * on the auto-port becomes forwarding/egress to other | |
154 | * ports and egress configuration is statically known, | |
155 | * we can say that ingress configuration of the | |
156 | * auto-port is also statically known. | |
157 | * This lets us disable promiscuous mode and write | |
158 | * this config to hw. | |
159 | */ | |
e0a47d1f TM |
160 | if (br->auto_cnt == 0 || |
161 | (br->auto_cnt == 1 && br_auto_port(p))) | |
2796d0c6 VY |
162 | br_port_clear_promisc(p); |
163 | else | |
164 | br_port_set_promisc(p); | |
165 | } | |
166 | } | |
167 | } | |
168 | ||
2756f68c NA |
169 | int nbp_backup_change(struct net_bridge_port *p, |
170 | struct net_device *backup_dev) | |
171 | { | |
172 | struct net_bridge_port *old_backup = rtnl_dereference(p->backup_port); | |
173 | struct net_bridge_port *backup_p = NULL; | |
174 | ||
175 | ASSERT_RTNL(); | |
176 | ||
177 | if (backup_dev) { | |
35f861e3 | 178 | if (!netif_is_bridge_port(backup_dev)) |
2756f68c NA |
179 | return -ENOENT; |
180 | ||
181 | backup_p = br_port_get_rtnl(backup_dev); | |
182 | if (backup_p->br != p->br) | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
186 | if (p == backup_p) | |
187 | return -EINVAL; | |
188 | ||
189 | if (old_backup == backup_p) | |
190 | return 0; | |
191 | ||
192 | /* if the backup link is already set, clear it */ | |
193 | if (old_backup) | |
194 | old_backup->backup_redirected_cnt--; | |
195 | ||
196 | if (backup_p) | |
197 | backup_p->backup_redirected_cnt++; | |
198 | rcu_assign_pointer(p->backup_port, backup_p); | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | static void nbp_backup_clear(struct net_bridge_port *p) | |
204 | { | |
205 | nbp_backup_change(p, NULL); | |
206 | if (p->backup_redirected_cnt) { | |
207 | struct net_bridge_port *cur_p; | |
208 | ||
209 | list_for_each_entry(cur_p, &p->br->port_list, list) { | |
210 | struct net_bridge_port *backup_p; | |
211 | ||
212 | backup_p = rtnl_dereference(cur_p->backup_port); | |
213 | if (backup_p == p) | |
214 | nbp_backup_change(cur_p, NULL); | |
215 | } | |
216 | } | |
217 | ||
218 | WARN_ON(rcu_access_pointer(p->backup_port) || p->backup_redirected_cnt); | |
219 | } | |
220 | ||
e028e4b8 VY |
221 | static void nbp_update_port_count(struct net_bridge *br) |
222 | { | |
223 | struct net_bridge_port *p; | |
224 | u32 cnt = 0; | |
225 | ||
226 | list_for_each_entry(p, &br->port_list, list) { | |
227 | if (br_auto_port(p)) | |
228 | cnt++; | |
229 | } | |
2796d0c6 VY |
230 | if (br->auto_cnt != cnt) { |
231 | br->auto_cnt = cnt; | |
232 | br_manage_promisc(br); | |
233 | } | |
234 | } | |
235 | ||
236 | static void nbp_delete_promisc(struct net_bridge_port *p) | |
237 | { | |
025559ee | 238 | /* If port is currently promiscuous, unset promiscuity. |
2796d0c6 VY |
239 | * Otherwise, it is a static port so remove all addresses |
240 | * from it. | |
241 | */ | |
242 | dev_set_allmulti(p->dev, -1); | |
243 | if (br_promisc_port(p)) | |
244 | dev_set_promiscuity(p->dev, -1); | |
245 | else | |
246 | br_fdb_unsync_static(p->br, p); | |
e028e4b8 VY |
247 | } |
248 | ||
bab1deea SH |
249 | static void release_nbp(struct kobject *kobj) |
250 | { | |
251 | struct net_bridge_port *p | |
252 | = container_of(kobj, struct net_bridge_port, kobj); | |
253 | kfree(p); | |
254 | } | |
255 | ||
705e0dea TH |
256 | static void brport_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid) |
257 | { | |
258 | struct net_bridge_port *p = kobj_to_brport(kobj); | |
259 | ||
260 | net_ns_get_ownership(dev_net(p->dev), uid, gid); | |
261 | } | |
262 | ||
bab1deea SH |
263 | static struct kobj_type brport_ktype = { |
264 | #ifdef CONFIG_SYSFS | |
265 | .sysfs_ops = &brport_sysfs_ops, | |
266 | #endif | |
267 | .release = release_nbp, | |
705e0dea | 268 | .get_ownership = brport_get_ownership, |
bab1deea SH |
269 | }; |
270 | ||
1da177e4 LT |
271 | static void destroy_nbp(struct net_bridge_port *p) |
272 | { | |
273 | struct net_device *dev = p->dev; | |
274 | ||
1da177e4 LT |
275 | p->br = NULL; |
276 | p->dev = NULL; | |
277 | dev_put(dev); | |
278 | ||
bab1deea | 279 | kobject_put(&p->kobj); |
1da177e4 LT |
280 | } |
281 | ||
282 | static void destroy_nbp_rcu(struct rcu_head *head) | |
283 | { | |
284 | struct net_bridge_port *p = | |
285 | container_of(head, struct net_bridge_port, rcu); | |
286 | destroy_nbp(p); | |
287 | } | |
288 | ||
45493d47 PA |
289 | static unsigned get_max_headroom(struct net_bridge *br) |
290 | { | |
291 | unsigned max_headroom = 0; | |
292 | struct net_bridge_port *p; | |
293 | ||
294 | list_for_each_entry(p, &br->port_list, list) { | |
295 | unsigned dev_headroom = netdev_get_fwd_headroom(p->dev); | |
296 | ||
297 | if (dev_headroom > max_headroom) | |
298 | max_headroom = dev_headroom; | |
299 | } | |
300 | ||
301 | return max_headroom; | |
302 | } | |
303 | ||
304 | static void update_headroom(struct net_bridge *br, int new_hr) | |
305 | { | |
306 | struct net_bridge_port *p; | |
307 | ||
308 | list_for_each_entry(p, &br->port_list, list) | |
309 | netdev_set_rx_headroom(p->dev, new_hr); | |
310 | ||
311 | br->dev->needed_headroom = new_hr; | |
312 | } | |
313 | ||
3f4cfc2d SH |
314 | /* Delete port(interface) from bridge is done in two steps. |
315 | * via RCU. First step, marks device as down. That deletes | |
316 | * all the timers and stops new packets from flowing through. | |
317 | * | |
318 | * Final cleanup doesn't occur until after all CPU's finished | |
319 | * processing packets. | |
320 | * | |
321 | * Protected from multiple admin operations by RTNL mutex | |
322 | */ | |
1da177e4 LT |
323 | static void del_nbp(struct net_bridge_port *p) |
324 | { | |
325 | struct net_bridge *br = p->br; | |
326 | struct net_device *dev = p->dev; | |
327 | ||
b3bcb72e | 328 | sysfs_remove_link(br->ifobj, p->dev->name); |
bab1deea | 329 | |
2796d0c6 | 330 | nbp_delete_promisc(p); |
1da177e4 LT |
331 | |
332 | spin_lock_bh(&br->lock); | |
333 | br_stp_disable_port(p); | |
334 | spin_unlock_bh(&br->lock); | |
335 | ||
92899063 | 336 | br_ifinfo_notify(RTM_DELLINK, NULL, p); |
b86c4503 | 337 | |
1da177e4 | 338 | list_del_rcu(&p->list); |
45493d47 PA |
339 | if (netdev_get_fwd_headroom(dev) == br->dev->needed_headroom) |
340 | update_headroom(br, get_max_headroom(br)); | |
341 | netdev_reset_rx_headroom(dev); | |
1da177e4 | 342 | |
f409d0ed | 343 | nbp_vlan_flush(p); |
1ea2d020 | 344 | br_fdb_delete_by_port(br, p, 0, 1); |
56607386 | 345 | switchdev_deferred_process(); |
2756f68c | 346 | nbp_backup_clear(p); |
56607386 | 347 | |
e028e4b8 VY |
348 | nbp_update_port_count(br); |
349 | ||
0f49579a JP |
350 | netdev_upper_dev_unlink(dev, br->dev); |
351 | ||
f350a0a8 JP |
352 | dev->priv_flags &= ~IFF_BRIDGE_PORT; |
353 | ||
ab95bfe0 | 354 | netdev_rx_handler_unregister(dev); |
b3f1be4b | 355 | |
3fe2d7c7 HX |
356 | br_multicast_del_port(p); |
357 | ||
125a12cc | 358 | kobject_uevent(&p->kobj, KOBJ_REMOVE); |
bab1deea SH |
359 | kobject_del(&p->kobj); |
360 | ||
91d2c34a HX |
361 | br_netpoll_disable(p); |
362 | ||
1da177e4 LT |
363 | call_rcu(&p->rcu, destroy_nbp_rcu); |
364 | } | |
365 | ||
1ce5cce8 | 366 | /* Delete bridge device */ |
367 | void br_dev_delete(struct net_device *dev, struct list_head *head) | |
1da177e4 | 368 | { |
1ce5cce8 | 369 | struct net_bridge *br = netdev_priv(dev); |
1da177e4 LT |
370 | struct net_bridge_port *p, *n; |
371 | ||
372 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
1da177e4 LT |
373 | del_nbp(p); |
374 | } | |
375 | ||
821f1b21 RP |
376 | br_recalculate_neigh_suppress_enabled(br); |
377 | ||
1ea2d020 | 378 | br_fdb_delete_by_port(br, NULL, 0, 1); |
f8730420 | 379 | |
f7cdee8a | 380 | cancel_delayed_work_sync(&br->gc_work); |
1da177e4 LT |
381 | |
382 | br_sysfs_delbr(br->dev); | |
8c56ba05 | 383 | unregister_netdevice_queue(br->dev, head); |
1da177e4 LT |
384 | } |
385 | ||
1da177e4 LT |
386 | /* find an available port number */ |
387 | static int find_portno(struct net_bridge *br) | |
388 | { | |
389 | int index; | |
390 | struct net_bridge_port *p; | |
391 | unsigned long *inuse; | |
392 | ||
459479da | 393 | inuse = bitmap_zalloc(BR_MAX_PORTS, GFP_KERNEL); |
1da177e4 LT |
394 | if (!inuse) |
395 | return -ENOMEM; | |
396 | ||
1da177e4 LT |
397 | set_bit(0, inuse); /* zero is reserved */ |
398 | list_for_each_entry(p, &br->port_list, list) { | |
399 | set_bit(p->port_no, inuse); | |
400 | } | |
401 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); | |
459479da | 402 | bitmap_free(inuse); |
1da177e4 LT |
403 | |
404 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; | |
405 | } | |
406 | ||
4433f420 | 407 | /* called with RTNL but without bridge lock */ |
9d6f229f | 408 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
4433f420 | 409 | struct net_device *dev) |
1da177e4 | 410 | { |
1da177e4 | 411 | struct net_bridge_port *p; |
1080ab95 | 412 | int index, err; |
9d6f229f | 413 | |
1da177e4 LT |
414 | index = find_portno(br); |
415 | if (index < 0) | |
416 | return ERR_PTR(index); | |
417 | ||
cee48541 | 418 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 LT |
419 | if (p == NULL) |
420 | return ERR_PTR(-ENOMEM); | |
421 | ||
1da177e4 LT |
422 | p->br = br; |
423 | dev_hold(dev); | |
424 | p->dev = dev; | |
4433f420 | 425 | p->path_cost = port_cost(dev); |
9d6f229f | 426 | p->priority = 0x8000 >> BR_PORT_BITS; |
1da177e4 | 427 | p->port_no = index; |
99f906e9 | 428 | p->flags = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD | BR_BCAST_FLOOD; |
1da177e4 | 429 | br_init_port(p); |
775dd692 | 430 | br_set_state(p, BR_STATE_DISABLED); |
d32439c0 | 431 | br_stp_port_timer_init(p); |
1080ab95 NA |
432 | err = br_multicast_add_port(p); |
433 | if (err) { | |
434 | dev_put(dev); | |
435 | kfree(p); | |
436 | p = ERR_PTR(err); | |
437 | } | |
1da177e4 LT |
438 | |
439 | return p; | |
440 | } | |
441 | ||
4aa678ba | 442 | int br_add_bridge(struct net *net, const char *name) |
1da177e4 LT |
443 | { |
444 | struct net_device *dev; | |
11f3a6bd | 445 | int res; |
1da177e4 | 446 | |
c835a677 | 447 | dev = alloc_netdev(sizeof(struct net_bridge), name, NET_NAME_UNKNOWN, |
bb900b27 | 448 | br_dev_setup); |
449 | ||
9d6f229f | 450 | if (!dev) |
1da177e4 LT |
451 | return -ENOMEM; |
452 | ||
bb900b27 | 453 | dev_net_set(dev, net); |
149ddd83 | 454 | dev->rtnl_link_ops = &br_link_ops; |
e340a90e | 455 | |
11f3a6bd ED |
456 | res = register_netdev(dev); |
457 | if (res) | |
458 | free_netdev(dev); | |
459 | return res; | |
1da177e4 LT |
460 | } |
461 | ||
4aa678ba | 462 | int br_del_bridge(struct net *net, const char *name) |
1da177e4 LT |
463 | { |
464 | struct net_device *dev; | |
465 | int ret = 0; | |
466 | ||
467 | rtnl_lock(); | |
4aa678ba | 468 | dev = __dev_get_by_name(net, name); |
9d6f229f | 469 | if (dev == NULL) |
1da177e4 LT |
470 | ret = -ENXIO; /* Could not find device */ |
471 | ||
472 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
473 | /* Attempt to delete non bridge device! */ | |
474 | ret = -EPERM; | |
475 | } | |
476 | ||
477 | else if (dev->flags & IFF_UP) { | |
478 | /* Not shutdown yet. */ | |
479 | ret = -EBUSY; | |
9d6f229f | 480 | } |
1da177e4 | 481 | |
9d6f229f | 482 | else |
1ce5cce8 | 483 | br_dev_delete(dev, NULL); |
1da177e4 LT |
484 | |
485 | rtnl_unlock(); | |
486 | return ret; | |
487 | } | |
488 | ||
804b854d NA |
489 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
490 | static int br_mtu_min(const struct net_bridge *br) | |
1da177e4 LT |
491 | { |
492 | const struct net_bridge_port *p; | |
f40aa233 | 493 | int ret_mtu = 0; |
1da177e4 | 494 | |
804b854d NA |
495 | list_for_each_entry(p, &br->port_list, list) |
496 | if (!ret_mtu || ret_mtu > p->dev->mtu) | |
f40aa233 | 497 | ret_mtu = p->dev->mtu; |
1da177e4 | 498 | |
f40aa233 | 499 | return ret_mtu ? ret_mtu : ETH_DATA_LEN; |
419d14af CW |
500 | } |
501 | ||
804b854d NA |
502 | void br_mtu_auto_adjust(struct net_bridge *br) |
503 | { | |
504 | ASSERT_RTNL(); | |
505 | ||
506 | /* if the bridge MTU was manually configured don't mess with it */ | |
3341d917 | 507 | if (br_opt_get(br, BROPT_MTU_SET_BY_USER)) |
804b854d NA |
508 | return; |
509 | ||
510 | /* change to the minimum MTU and clear the flag which was set by | |
511 | * the bridge ndo_change_mtu callback | |
512 | */ | |
513 | dev_set_mtu(br->dev, br_mtu_min(br)); | |
3341d917 | 514 | br_opt_toggle(br, BROPT_MTU_SET_BY_USER, false); |
804b854d NA |
515 | } |
516 | ||
ae74f100 ED |
517 | static void br_set_gso_limits(struct net_bridge *br) |
518 | { | |
519 | unsigned int gso_max_size = GSO_MAX_SIZE; | |
520 | u16 gso_max_segs = GSO_MAX_SEGS; | |
521 | const struct net_bridge_port *p; | |
522 | ||
523 | list_for_each_entry(p, &br->port_list, list) { | |
524 | gso_max_size = min(gso_max_size, p->dev->gso_max_size); | |
525 | gso_max_segs = min(gso_max_segs, p->dev->gso_max_segs); | |
526 | } | |
527 | br->dev->gso_max_size = gso_max_size; | |
528 | br->dev->gso_max_segs = gso_max_segs; | |
529 | } | |
530 | ||
81d35307 SH |
531 | /* |
532 | * Recomputes features using slave's features | |
533 | */ | |
c8f44aff MM |
534 | netdev_features_t br_features_recompute(struct net_bridge *br, |
535 | netdev_features_t features) | |
81d35307 SH |
536 | { |
537 | struct net_bridge_port *p; | |
c8f44aff | 538 | netdev_features_t mask; |
81d35307 | 539 | |
b63365a2 | 540 | if (list_empty(&br->port_list)) |
c4d27ef9 | 541 | return features; |
b63365a2 | 542 | |
c4d27ef9 | 543 | mask = features; |
b63365a2 | 544 | features &= ~NETIF_F_ONE_FOR_ALL; |
81d35307 SH |
545 | |
546 | list_for_each_entry(p, &br->port_list, list) { | |
b63365a2 HX |
547 | features = netdev_increment_features(features, |
548 | p->dev->features, mask); | |
81d35307 | 549 | } |
f902e881 | 550 | features = netdev_add_tso_features(features, mask); |
81d35307 | 551 | |
c4d27ef9 | 552 | return features; |
81d35307 SH |
553 | } |
554 | ||
1da177e4 | 555 | /* called with RTNL */ |
ca752be0 DA |
556 | int br_add_if(struct net_bridge *br, struct net_device *dev, |
557 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
558 | { |
559 | struct net_bridge_port *p; | |
560 | int err = 0; | |
45493d47 | 561 | unsigned br_hr, dev_hr; |
edf947f1 | 562 | bool changed_addr; |
1da177e4 | 563 | |
8db0a2ee FF |
564 | /* Don't allow bridging non-ethernet like devices, or DSA-enabled |
565 | * master network devices since the bridge layer rx_handler prevents | |
566 | * the DSA fake ethertype handler to be invoked, so we do not strip off | |
567 | * the DSA switch tag protocol header and the bridge layer just return | |
568 | * RX_HANDLER_CONSUMED, stopping RX processing for these frames. | |
569 | */ | |
1056bd51 | 570 | if ((dev->flags & IFF_LOOPBACK) || |
77f98598 | 571 | dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN || |
8db0a2ee FF |
572 | !is_valid_ether_addr(dev->dev_addr) || |
573 | netdev_uses_dsa(dev)) | |
1da177e4 LT |
574 | return -EINVAL; |
575 | ||
1056bd51 | 576 | /* No bridging of bridges */ |
ca752be0 DA |
577 | if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit) { |
578 | NL_SET_ERR_MSG(extack, | |
579 | "Can not enslave a bridge to a bridge"); | |
1da177e4 | 580 | return -ELOOP; |
ca752be0 | 581 | } |
1da177e4 | 582 | |
e8238fc2 HL |
583 | /* Device has master upper dev */ |
584 | if (netdev_master_upper_dev_get(dev)) | |
1da177e4 LT |
585 | return -EBUSY; |
586 | ||
ad4bb6f8 | 587 | /* No bridging devices that dislike that (e.g. wireless) */ |
ca752be0 DA |
588 | if (dev->priv_flags & IFF_DONT_BRIDGE) { |
589 | NL_SET_ERR_MSG(extack, | |
590 | "Device does not allow enslaving to a bridge"); | |
ad4bb6f8 | 591 | return -EOPNOTSUPP; |
ca752be0 | 592 | } |
ad4bb6f8 | 593 | |
bab1deea SH |
594 | p = new_nbp(br, dev); |
595 | if (IS_ERR(p)) | |
1da177e4 LT |
596 | return PTR_ERR(p); |
597 | ||
bb8ed630 AW |
598 | call_netdevice_notifiers(NETDEV_JOIN, dev); |
599 | ||
2796d0c6 | 600 | err = dev_set_allmulti(dev, 1); |
bdfad5ae TH |
601 | if (err) { |
602 | kfree(p); /* kobject not yet init'd, manually free */ | |
603 | goto err1; | |
604 | } | |
bc3f9076 | 605 | |
e32cc736 GKH |
606 | err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), |
607 | SYSFS_BRIDGE_PORT_ATTR); | |
bab1deea | 608 | if (err) |
bdfad5ae | 609 | goto err2; |
1da177e4 | 610 | |
bab1deea SH |
611 | err = br_sysfs_addif(p); |
612 | if (err) | |
613 | goto err2; | |
1da177e4 | 614 | |
a8779ec1 | 615 | err = br_netpoll_enable(p); |
93d8bf9f | 616 | if (err) |
91d2c34a HX |
617 | goto err3; |
618 | ||
0f49579a | 619 | err = netdev_rx_handler_register(dev, br_handle_frame, p); |
ab95bfe0 | 620 | if (err) |
9b1536c4 | 621 | goto err4; |
f350a0a8 | 622 | |
0f49579a JP |
623 | dev->priv_flags |= IFF_BRIDGE_PORT; |
624 | ||
ca752be0 | 625 | err = netdev_master_upper_dev_link(dev, br->dev, NULL, NULL, extack); |
afc6151a | 626 | if (err) |
9b1536c4 | 627 | goto err5; |
afc6151a | 628 | |
6bc506b4 IS |
629 | err = nbp_switchdev_mark_set(p); |
630 | if (err) | |
631 | goto err6; | |
632 | ||
0187bdfb | 633 | dev_disable_lro(dev); |
bab1deea SH |
634 | |
635 | list_add_rcu(&p->list, &br->port_list); | |
636 | ||
e028e4b8 VY |
637 | nbp_update_port_count(br); |
638 | ||
c4d27ef9 MM |
639 | netdev_update_features(br->dev); |
640 | ||
45493d47 PA |
641 | br_hr = br->dev->needed_headroom; |
642 | dev_hr = netdev_get_fwd_headroom(dev); | |
643 | if (br_hr < dev_hr) | |
644 | update_headroom(br, dev_hr); | |
645 | else | |
646 | netdev_set_rx_headroom(dev, br_hr); | |
fd094808 | 647 | |
a4b816d8 TM |
648 | if (br_fdb_insert(br, p, dev->dev_addr, 0)) |
649 | netdev_err(dev, "failed insert local address bridge forwarding table\n"); | |
650 | ||
ca935da7 PM |
651 | if (br->dev->addr_assign_type != NET_ADDR_SET) { |
652 | /* Ask for permission to use this MAC address now, even if we | |
653 | * don't end up choosing it below. | |
654 | */ | |
655 | err = dev_pre_changeaddr_notify(br->dev, dev->dev_addr, extack); | |
656 | if (err) | |
657 | goto err7; | |
658 | } | |
659 | ||
169327d5 | 660 | err = nbp_vlan_init(p, extack); |
08474cc1 | 661 | if (err) { |
5be5a2df | 662 | netdev_err(dev, "failed to initialize vlan filtering on this port\n"); |
6bc506b4 | 663 | goto err7; |
08474cc1 | 664 | } |
5be5a2df | 665 | |
bab1deea | 666 | spin_lock_bh(&br->lock); |
edf947f1 | 667 | changed_addr = br_stp_recalculate_bridge_id(br); |
de79059e | 668 | |
576eb625 | 669 | if (netif_running(dev) && netif_oper_up(dev) && |
de79059e AS |
670 | (br->dev->flags & IFF_UP)) |
671 | br_stp_enable_port(p); | |
bab1deea SH |
672 | spin_unlock_bh(&br->lock); |
673 | ||
92899063 | 674 | br_ifinfo_notify(RTM_NEWLINK, NULL, p); |
b86c4503 | 675 | |
edf947f1 | 676 | if (changed_addr) |
56139fc5 | 677 | call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); |
edf947f1 | 678 | |
804b854d | 679 | br_mtu_auto_adjust(br); |
ae74f100 | 680 | br_set_gso_limits(br); |
269def7c | 681 | |
bab1deea | 682 | kobject_uevent(&p->kobj, KOBJ_ADD); |
1da177e4 | 683 | |
bab1deea | 684 | return 0; |
afc6151a | 685 | |
6bc506b4 | 686 | err7: |
08474cc1 ER |
687 | list_del_rcu(&p->list); |
688 | br_fdb_delete_by_port(br, p, 0, 1); | |
689 | nbp_update_port_count(br); | |
6bc506b4 | 690 | err6: |
08474cc1 | 691 | netdev_upper_dev_unlink(dev, br->dev); |
9b1536c4 | 692 | err5: |
0f49579a JP |
693 | dev->priv_flags &= ~IFF_BRIDGE_PORT; |
694 | netdev_rx_handler_unregister(dev); | |
9b1536c4 G |
695 | err4: |
696 | br_netpoll_disable(p); | |
91d2c34a HX |
697 | err3: |
698 | sysfs_remove_link(br->ifobj, p->dev->name); | |
bab1deea | 699 | err2: |
c587aea9 | 700 | kobject_put(&p->kobj); |
019ee792 | 701 | dev_set_allmulti(dev, -1); |
bdfad5ae | 702 | err1: |
43af8532 | 703 | dev_put(dev); |
1da177e4 LT |
704 | return err; |
705 | } | |
706 | ||
707 | /* called with RTNL */ | |
708 | int br_del_if(struct net_bridge *br, struct net_device *dev) | |
709 | { | |
f350a0a8 | 710 | struct net_bridge_port *p; |
9be6dd65 | 711 | bool changed_addr; |
f350a0a8 | 712 | |
ec1e5610 | 713 | p = br_port_get_rtnl(dev); |
b5ed54e9 | 714 | if (!p || p->br != br) |
1da177e4 LT |
715 | return -EINVAL; |
716 | ||
d30362c0 AW |
717 | /* Since more than one interface can be attached to a bridge, |
718 | * there still maybe an alternate path for netconsole to use; | |
719 | * therefore there is no reason for a NETDEV_RELEASE event. | |
720 | */ | |
1da177e4 LT |
721 | del_nbp(p); |
722 | ||
804b854d | 723 | br_mtu_auto_adjust(br); |
ae74f100 | 724 | br_set_gso_limits(br); |
4c906c27 | 725 | |
1da177e4 | 726 | spin_lock_bh(&br->lock); |
9be6dd65 | 727 | changed_addr = br_stp_recalculate_bridge_id(br); |
1da177e4 LT |
728 | spin_unlock_bh(&br->lock); |
729 | ||
9be6dd65 AW |
730 | if (changed_addr) |
731 | call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); | |
732 | ||
c4d27ef9 MM |
733 | netdev_update_features(br->dev); |
734 | ||
1da177e4 LT |
735 | return 0; |
736 | } | |
e028e4b8 VY |
737 | |
738 | void br_port_flags_change(struct net_bridge_port *p, unsigned long mask) | |
739 | { | |
740 | struct net_bridge *br = p->br; | |
741 | ||
742 | if (mask & BR_AUTO_MASK) | |
743 | nbp_update_port_count(br); | |
821f1b21 RP |
744 | |
745 | if (mask & BR_NEIGH_SUPPRESS) | |
746 | br_recalculate_neigh_suppress_enabled(br); | |
e028e4b8 | 747 | } |
085ddc87 IS |
748 | |
749 | bool br_port_flag_is_set(const struct net_device *dev, unsigned long flag) | |
750 | { | |
751 | struct net_bridge_port *p; | |
752 | ||
753 | p = br_port_get_rtnl_rcu(dev); | |
754 | if (!p) | |
755 | return false; | |
756 | ||
757 | return p->flags & flag; | |
758 | } | |
759 | EXPORT_SYMBOL_GPL(br_port_flag_is_set); |