Commit | Line | Data |
---|---|---|
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; | |
bd139381 SH |
43 | case SPEED_5000: |
44 | return 3; | |
45 | case SPEED_2500: | |
fa3df928 | 46 | return 4; |
bd139381 SH |
47 | case SPEED_1000: |
48 | return 5; | |
fa3df928 JP |
49 | case SPEED_100: |
50 | return 19; | |
51 | case SPEED_10: | |
52 | return 100; | |
bd139381 SH |
53 | case SPEED_UNKNOWN: |
54 | return 100; | |
55 | default: | |
56 | if (ecmd.base.speed > SPEED_10000) | |
57 | return 1; | |
1da177e4 LT |
58 | } |
59 | } | |
60 | ||
61 | /* Old silly heuristics based on name */ | |
62 | if (!strncmp(dev->name, "lec", 3)) | |
63 | return 7; | |
64 | ||
65 | if (!strncmp(dev->name, "plip", 4)) | |
66 | return 2500; | |
67 | ||
68 | return 100; /* assume old 10Mbps */ | |
69 | } | |
70 | ||
4433f420 | 71 | |
1a81a2e0 | 72 | /* Check for port carrier transitions. */ |
faa1cd82 | 73 | void br_port_carrier_check(struct net_bridge_port *p, bool *notified) |
4433f420 | 74 | { |
269def7c SH |
75 | struct net_device *dev = p->dev; |
76 | struct net_bridge *br = p->br; | |
6e86b890 | 77 | |
8f3359bd | 78 | if (!(p->flags & BR_ADMIN_COST) && |
79 | netif_running(dev) && netif_oper_up(dev)) | |
6e86b890 SH |
80 | p->path_cost = port_cost(dev); |
81 | ||
faa1cd82 | 82 | *notified = false; |
aa7c6e5f | 83 | if (!netif_running(br->dev)) |
84 | return; | |
85 | ||
86 | spin_lock_bh(&br->lock); | |
576eb625 | 87 | if (netif_running(dev) && netif_oper_up(dev)) { |
faa1cd82 | 88 | if (p->state == BR_STATE_DISABLED) { |
aa7c6e5f | 89 | br_stp_enable_port(p); |
faa1cd82 NA |
90 | *notified = true; |
91 | } | |
aa7c6e5f | 92 | } else { |
faa1cd82 | 93 | if (p->state != BR_STATE_DISABLED) { |
aa7c6e5f | 94 | br_stp_disable_port(p); |
faa1cd82 NA |
95 | *notified = true; |
96 | } | |
4433f420 | 97 | } |
aa7c6e5f | 98 | spin_unlock_bh(&br->lock); |
4433f420 SH |
99 | } |
100 | ||
2796d0c6 VY |
101 | static void br_port_set_promisc(struct net_bridge_port *p) |
102 | { | |
103 | int err = 0; | |
104 | ||
105 | if (br_promisc_port(p)) | |
106 | return; | |
107 | ||
108 | err = dev_set_promiscuity(p->dev, 1); | |
109 | if (err) | |
110 | return; | |
111 | ||
112 | br_fdb_unsync_static(p->br, p); | |
113 | p->flags |= BR_PROMISC; | |
114 | } | |
115 | ||
116 | static void br_port_clear_promisc(struct net_bridge_port *p) | |
117 | { | |
118 | int err; | |
119 | ||
120 | /* Check if the port is already non-promisc or if it doesn't | |
121 | * support UNICAST filtering. Without unicast filtering support | |
122 | * we'll end up re-enabling promisc mode anyway, so just check for | |
123 | * it here. | |
124 | */ | |
125 | if (!br_promisc_port(p) || !(p->dev->priv_flags & IFF_UNICAST_FLT)) | |
126 | return; | |
127 | ||
128 | /* Since we'll be clearing the promisc mode, program the port | |
129 | * first so that we don't have interruption in traffic. | |
130 | */ | |
131 | err = br_fdb_sync_static(p->br, p); | |
132 | if (err) | |
133 | return; | |
134 | ||
135 | dev_set_promiscuity(p->dev, -1); | |
136 | p->flags &= ~BR_PROMISC; | |
137 | } | |
138 | ||
139 | /* When a port is added or removed or when certain port flags | |
140 | * change, this function is called to automatically manage | |
141 | * promiscuity setting of all the bridge ports. We are always called | |
142 | * under RTNL so can skip using rcu primitives. | |
143 | */ | |
144 | void br_manage_promisc(struct net_bridge *br) | |
145 | { | |
146 | struct net_bridge_port *p; | |
147 | bool set_all = false; | |
148 | ||
149 | /* If vlan filtering is disabled or bridge interface is placed | |
150 | * into promiscuous mode, place all ports in promiscuous mode. | |
151 | */ | |
1f51445a | 152 | if ((br->dev->flags & IFF_PROMISC) || !br_vlan_enabled(br->dev)) |
2796d0c6 VY |
153 | set_all = true; |
154 | ||
155 | list_for_each_entry(p, &br->port_list, list) { | |
156 | if (set_all) { | |
157 | br_port_set_promisc(p); | |
158 | } else { | |
159 | /* If the number of auto-ports is <= 1, then all other | |
160 | * ports will have their output configuration | |
161 | * statically specified through fdbs. Since ingress | |
162 | * on the auto-port becomes forwarding/egress to other | |
163 | * ports and egress configuration is statically known, | |
164 | * we can say that ingress configuration of the | |
165 | * auto-port is also statically known. | |
166 | * This lets us disable promiscuous mode and write | |
167 | * this config to hw. | |
168 | */ | |
e0a47d1f TM |
169 | if (br->auto_cnt == 0 || |
170 | (br->auto_cnt == 1 && br_auto_port(p))) | |
2796d0c6 VY |
171 | br_port_clear_promisc(p); |
172 | else | |
173 | br_port_set_promisc(p); | |
174 | } | |
175 | } | |
176 | } | |
177 | ||
2756f68c NA |
178 | int nbp_backup_change(struct net_bridge_port *p, |
179 | struct net_device *backup_dev) | |
180 | { | |
181 | struct net_bridge_port *old_backup = rtnl_dereference(p->backup_port); | |
182 | struct net_bridge_port *backup_p = NULL; | |
183 | ||
184 | ASSERT_RTNL(); | |
185 | ||
186 | if (backup_dev) { | |
35f861e3 | 187 | if (!netif_is_bridge_port(backup_dev)) |
2756f68c NA |
188 | return -ENOENT; |
189 | ||
190 | backup_p = br_port_get_rtnl(backup_dev); | |
191 | if (backup_p->br != p->br) | |
192 | return -EINVAL; | |
193 | } | |
194 | ||
195 | if (p == backup_p) | |
196 | return -EINVAL; | |
197 | ||
198 | if (old_backup == backup_p) | |
199 | return 0; | |
200 | ||
201 | /* if the backup link is already set, clear it */ | |
202 | if (old_backup) | |
203 | old_backup->backup_redirected_cnt--; | |
204 | ||
205 | if (backup_p) | |
206 | backup_p->backup_redirected_cnt++; | |
207 | rcu_assign_pointer(p->backup_port, backup_p); | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | static void nbp_backup_clear(struct net_bridge_port *p) | |
213 | { | |
214 | nbp_backup_change(p, NULL); | |
215 | if (p->backup_redirected_cnt) { | |
216 | struct net_bridge_port *cur_p; | |
217 | ||
218 | list_for_each_entry(cur_p, &p->br->port_list, list) { | |
219 | struct net_bridge_port *backup_p; | |
220 | ||
221 | backup_p = rtnl_dereference(cur_p->backup_port); | |
222 | if (backup_p == p) | |
223 | nbp_backup_change(cur_p, NULL); | |
224 | } | |
225 | } | |
226 | ||
227 | WARN_ON(rcu_access_pointer(p->backup_port) || p->backup_redirected_cnt); | |
228 | } | |
229 | ||
e028e4b8 VY |
230 | static void nbp_update_port_count(struct net_bridge *br) |
231 | { | |
232 | struct net_bridge_port *p; | |
233 | u32 cnt = 0; | |
234 | ||
235 | list_for_each_entry(p, &br->port_list, list) { | |
236 | if (br_auto_port(p)) | |
237 | cnt++; | |
238 | } | |
2796d0c6 VY |
239 | if (br->auto_cnt != cnt) { |
240 | br->auto_cnt = cnt; | |
241 | br_manage_promisc(br); | |
242 | } | |
243 | } | |
244 | ||
245 | static void nbp_delete_promisc(struct net_bridge_port *p) | |
246 | { | |
025559ee | 247 | /* If port is currently promiscuous, unset promiscuity. |
2796d0c6 VY |
248 | * Otherwise, it is a static port so remove all addresses |
249 | * from it. | |
250 | */ | |
251 | dev_set_allmulti(p->dev, -1); | |
252 | if (br_promisc_port(p)) | |
253 | dev_set_promiscuity(p->dev, -1); | |
254 | else | |
255 | br_fdb_unsync_static(p->br, p); | |
e028e4b8 VY |
256 | } |
257 | ||
bab1deea SH |
258 | static void release_nbp(struct kobject *kobj) |
259 | { | |
260 | struct net_bridge_port *p | |
261 | = container_of(kobj, struct net_bridge_port, kobj); | |
262 | kfree(p); | |
263 | } | |
264 | ||
02a476d9 | 265 | static void brport_get_ownership(const struct kobject *kobj, kuid_t *uid, kgid_t *gid) |
705e0dea TH |
266 | { |
267 | struct net_bridge_port *p = kobj_to_brport(kobj); | |
268 | ||
269 | net_ns_get_ownership(dev_net(p->dev), uid, gid); | |
270 | } | |
271 | ||
e8c6cbd7 | 272 | static const struct kobj_type brport_ktype = { |
bab1deea SH |
273 | #ifdef CONFIG_SYSFS |
274 | .sysfs_ops = &brport_sysfs_ops, | |
275 | #endif | |
276 | .release = release_nbp, | |
705e0dea | 277 | .get_ownership = brport_get_ownership, |
bab1deea SH |
278 | }; |
279 | ||
1da177e4 LT |
280 | static void destroy_nbp(struct net_bridge_port *p) |
281 | { | |
282 | struct net_device *dev = p->dev; | |
283 | ||
1da177e4 LT |
284 | p->br = NULL; |
285 | p->dev = NULL; | |
d62607c3 | 286 | netdev_put(dev, &p->dev_tracker); |
1da177e4 | 287 | |
bab1deea | 288 | kobject_put(&p->kobj); |
1da177e4 LT |
289 | } |
290 | ||
291 | static void destroy_nbp_rcu(struct rcu_head *head) | |
292 | { | |
293 | struct net_bridge_port *p = | |
294 | container_of(head, struct net_bridge_port, rcu); | |
295 | destroy_nbp(p); | |
296 | } | |
297 | ||
45493d47 PA |
298 | static unsigned get_max_headroom(struct net_bridge *br) |
299 | { | |
300 | unsigned max_headroom = 0; | |
301 | struct net_bridge_port *p; | |
302 | ||
303 | list_for_each_entry(p, &br->port_list, list) { | |
304 | unsigned dev_headroom = netdev_get_fwd_headroom(p->dev); | |
305 | ||
306 | if (dev_headroom > max_headroom) | |
307 | max_headroom = dev_headroom; | |
308 | } | |
309 | ||
310 | return max_headroom; | |
311 | } | |
312 | ||
313 | static void update_headroom(struct net_bridge *br, int new_hr) | |
314 | { | |
315 | struct net_bridge_port *p; | |
316 | ||
317 | list_for_each_entry(p, &br->port_list, list) | |
318 | netdev_set_rx_headroom(p->dev, new_hr); | |
319 | ||
320 | br->dev->needed_headroom = new_hr; | |
321 | } | |
322 | ||
3f4cfc2d SH |
323 | /* Delete port(interface) from bridge is done in two steps. |
324 | * via RCU. First step, marks device as down. That deletes | |
325 | * all the timers and stops new packets from flowing through. | |
326 | * | |
327 | * Final cleanup doesn't occur until after all CPU's finished | |
328 | * processing packets. | |
329 | * | |
330 | * Protected from multiple admin operations by RTNL mutex | |
331 | */ | |
1da177e4 LT |
332 | static void del_nbp(struct net_bridge_port *p) |
333 | { | |
334 | struct net_bridge *br = p->br; | |
335 | struct net_device *dev = p->dev; | |
336 | ||
b3bcb72e | 337 | sysfs_remove_link(br->ifobj, p->dev->name); |
bab1deea | 338 | |
2796d0c6 | 339 | nbp_delete_promisc(p); |
1da177e4 LT |
340 | |
341 | spin_lock_bh(&br->lock); | |
342 | br_stp_disable_port(p); | |
343 | spin_unlock_bh(&br->lock); | |
344 | ||
65369933 | 345 | br_mrp_port_del(br, p); |
86a14b79 | 346 | br_cfm_port_del(br, p); |
65369933 | 347 | |
92899063 | 348 | br_ifinfo_notify(RTM_DELLINK, NULL, p); |
b86c4503 | 349 | |
1da177e4 | 350 | list_del_rcu(&p->list); |
45493d47 PA |
351 | if (netdev_get_fwd_headroom(dev) == br->dev->needed_headroom) |
352 | update_headroom(br, get_max_headroom(br)); | |
353 | netdev_reset_rx_headroom(dev); | |
1da177e4 | 354 | |
f409d0ed | 355 | nbp_vlan_flush(p); |
1ea2d020 | 356 | br_fdb_delete_by_port(br, p, 0, 1); |
56607386 | 357 | switchdev_deferred_process(); |
2756f68c | 358 | nbp_backup_clear(p); |
56607386 | 359 | |
e028e4b8 VY |
360 | nbp_update_port_count(br); |
361 | ||
0f49579a JP |
362 | netdev_upper_dev_unlink(dev, br->dev); |
363 | ||
f350a0a8 JP |
364 | dev->priv_flags &= ~IFF_BRIDGE_PORT; |
365 | ||
ab95bfe0 | 366 | netdev_rx_handler_unregister(dev); |
b3f1be4b | 367 | |
3fe2d7c7 HX |
368 | br_multicast_del_port(p); |
369 | ||
125a12cc | 370 | kobject_uevent(&p->kobj, KOBJ_REMOVE); |
bab1deea SH |
371 | kobject_del(&p->kobj); |
372 | ||
91d2c34a HX |
373 | br_netpoll_disable(p); |
374 | ||
1da177e4 LT |
375 | call_rcu(&p->rcu, destroy_nbp_rcu); |
376 | } | |
377 | ||
1ce5cce8 | 378 | /* Delete bridge device */ |
379 | void br_dev_delete(struct net_device *dev, struct list_head *head) | |
1da177e4 | 380 | { |
1ce5cce8 | 381 | struct net_bridge *br = netdev_priv(dev); |
1da177e4 LT |
382 | struct net_bridge_port *p, *n; |
383 | ||
384 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
1da177e4 LT |
385 | del_nbp(p); |
386 | } | |
387 | ||
821f1b21 RP |
388 | br_recalculate_neigh_suppress_enabled(br); |
389 | ||
1ea2d020 | 390 | br_fdb_delete_by_port(br, NULL, 0, 1); |
f8730420 | 391 | |
f7cdee8a | 392 | cancel_delayed_work_sync(&br->gc_work); |
1da177e4 LT |
393 | |
394 | br_sysfs_delbr(br->dev); | |
8c56ba05 | 395 | unregister_netdevice_queue(br->dev, head); |
1da177e4 LT |
396 | } |
397 | ||
1da177e4 LT |
398 | /* find an available port number */ |
399 | static int find_portno(struct net_bridge *br) | |
400 | { | |
401 | int index; | |
402 | struct net_bridge_port *p; | |
403 | unsigned long *inuse; | |
404 | ||
459479da | 405 | inuse = bitmap_zalloc(BR_MAX_PORTS, GFP_KERNEL); |
1da177e4 LT |
406 | if (!inuse) |
407 | return -ENOMEM; | |
408 | ||
cc0be1ad CJ |
409 | __set_bit(0, inuse); /* zero is reserved */ |
410 | list_for_each_entry(p, &br->port_list, list) | |
411 | __set_bit(p->port_no, inuse); | |
412 | ||
1da177e4 | 413 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); |
459479da | 414 | bitmap_free(inuse); |
1da177e4 LT |
415 | |
416 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; | |
417 | } | |
418 | ||
4433f420 | 419 | /* called with RTNL but without bridge lock */ |
9d6f229f | 420 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
4433f420 | 421 | struct net_device *dev) |
1da177e4 | 422 | { |
1da177e4 | 423 | struct net_bridge_port *p; |
1080ab95 | 424 | int index, err; |
9d6f229f | 425 | |
1da177e4 LT |
426 | index = find_portno(br); |
427 | if (index < 0) | |
428 | return ERR_PTR(index); | |
429 | ||
cee48541 | 430 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 LT |
431 | if (p == NULL) |
432 | return ERR_PTR(-ENOMEM); | |
433 | ||
1da177e4 | 434 | p->br = br; |
d62607c3 | 435 | netdev_hold(dev, &p->dev_tracker, GFP_KERNEL); |
1da177e4 | 436 | p->dev = dev; |
4433f420 | 437 | p->path_cost = port_cost(dev); |
9d6f229f | 438 | p->priority = 0x8000 >> BR_PORT_BITS; |
1da177e4 | 439 | p->port_no = index; |
99f906e9 | 440 | p->flags = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD | BR_BCAST_FLOOD; |
1da177e4 | 441 | br_init_port(p); |
775dd692 | 442 | br_set_state(p, BR_STATE_DISABLED); |
d32439c0 | 443 | br_stp_port_timer_init(p); |
1080ab95 NA |
444 | err = br_multicast_add_port(p); |
445 | if (err) { | |
d62607c3 | 446 | netdev_put(dev, &p->dev_tracker); |
1080ab95 NA |
447 | kfree(p); |
448 | p = ERR_PTR(err); | |
449 | } | |
1da177e4 LT |
450 | |
451 | return p; | |
452 | } | |
453 | ||
4aa678ba | 454 | int br_add_bridge(struct net *net, const char *name) |
1da177e4 LT |
455 | { |
456 | struct net_device *dev; | |
11f3a6bd | 457 | int res; |
1da177e4 | 458 | |
c835a677 | 459 | dev = alloc_netdev(sizeof(struct net_bridge), name, NET_NAME_UNKNOWN, |
bb900b27 | 460 | br_dev_setup); |
461 | ||
9d6f229f | 462 | if (!dev) |
1da177e4 LT |
463 | return -ENOMEM; |
464 | ||
bb900b27 | 465 | dev_net_set(dev, net); |
149ddd83 | 466 | dev->rtnl_link_ops = &br_link_ops; |
e340a90e | 467 | |
893b1958 | 468 | res = register_netdevice(dev); |
11f3a6bd ED |
469 | if (res) |
470 | free_netdev(dev); | |
471 | return res; | |
1da177e4 LT |
472 | } |
473 | ||
4aa678ba | 474 | int br_del_bridge(struct net *net, const char *name) |
1da177e4 LT |
475 | { |
476 | struct net_device *dev; | |
477 | int ret = 0; | |
478 | ||
4aa678ba | 479 | dev = __dev_get_by_name(net, name); |
9d6f229f | 480 | if (dev == NULL) |
1da177e4 LT |
481 | ret = -ENXIO; /* Could not find device */ |
482 | ||
254ec036 | 483 | else if (!netif_is_bridge_master(dev)) { |
1da177e4 LT |
484 | /* Attempt to delete non bridge device! */ |
485 | ret = -EPERM; | |
486 | } | |
487 | ||
488 | else if (dev->flags & IFF_UP) { | |
489 | /* Not shutdown yet. */ | |
490 | ret = -EBUSY; | |
9d6f229f | 491 | } |
1da177e4 | 492 | |
9d6f229f | 493 | else |
1ce5cce8 | 494 | br_dev_delete(dev, NULL); |
1da177e4 | 495 | |
1da177e4 LT |
496 | return ret; |
497 | } | |
498 | ||
804b854d NA |
499 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
500 | static int br_mtu_min(const struct net_bridge *br) | |
1da177e4 LT |
501 | { |
502 | const struct net_bridge_port *p; | |
f40aa233 | 503 | int ret_mtu = 0; |
1da177e4 | 504 | |
804b854d NA |
505 | list_for_each_entry(p, &br->port_list, list) |
506 | if (!ret_mtu || ret_mtu > p->dev->mtu) | |
f40aa233 | 507 | ret_mtu = p->dev->mtu; |
1da177e4 | 508 | |
f40aa233 | 509 | return ret_mtu ? ret_mtu : ETH_DATA_LEN; |
419d14af CW |
510 | } |
511 | ||
804b854d NA |
512 | void br_mtu_auto_adjust(struct net_bridge *br) |
513 | { | |
514 | ASSERT_RTNL(); | |
515 | ||
516 | /* if the bridge MTU was manually configured don't mess with it */ | |
3341d917 | 517 | if (br_opt_get(br, BROPT_MTU_SET_BY_USER)) |
804b854d NA |
518 | return; |
519 | ||
520 | /* change to the minimum MTU and clear the flag which was set by | |
521 | * the bridge ndo_change_mtu callback | |
522 | */ | |
523 | dev_set_mtu(br->dev, br_mtu_min(br)); | |
3341d917 | 524 | br_opt_toggle(br, BROPT_MTU_SET_BY_USER, false); |
804b854d NA |
525 | } |
526 | ||
ae74f100 ED |
527 | static void br_set_gso_limits(struct net_bridge *br) |
528 | { | |
ee8b7a11 | 529 | unsigned int tso_max_size = TSO_MAX_SIZE; |
ae74f100 | 530 | const struct net_bridge_port *p; |
ee8b7a11 | 531 | u16 tso_max_segs = TSO_MAX_SEGS; |
ae74f100 ED |
532 | |
533 | list_for_each_entry(p, &br->port_list, list) { | |
ee8b7a11 JK |
534 | tso_max_size = min(tso_max_size, p->dev->tso_max_size); |
535 | tso_max_segs = min(tso_max_segs, p->dev->tso_max_segs); | |
ae74f100 | 536 | } |
ee8b7a11 JK |
537 | netif_set_tso_max_size(br->dev, tso_max_size); |
538 | netif_set_tso_max_segs(br->dev, tso_max_segs); | |
ae74f100 ED |
539 | } |
540 | ||
81d35307 SH |
541 | /* |
542 | * Recomputes features using slave's features | |
543 | */ | |
c8f44aff MM |
544 | netdev_features_t br_features_recompute(struct net_bridge *br, |
545 | netdev_features_t features) | |
81d35307 SH |
546 | { |
547 | struct net_bridge_port *p; | |
c8f44aff | 548 | netdev_features_t mask; |
81d35307 | 549 | |
b63365a2 | 550 | if (list_empty(&br->port_list)) |
c4d27ef9 | 551 | return features; |
b63365a2 | 552 | |
c4d27ef9 | 553 | mask = features; |
b63365a2 | 554 | features &= ~NETIF_F_ONE_FOR_ALL; |
81d35307 SH |
555 | |
556 | list_for_each_entry(p, &br->port_list, list) { | |
b63365a2 HX |
557 | features = netdev_increment_features(features, |
558 | p->dev->features, mask); | |
81d35307 | 559 | } |
f902e881 | 560 | features = netdev_add_tso_features(features, mask); |
81d35307 | 561 | |
c4d27ef9 | 562 | return features; |
81d35307 SH |
563 | } |
564 | ||
1da177e4 | 565 | /* called with RTNL */ |
ca752be0 DA |
566 | int br_add_if(struct net_bridge *br, struct net_device *dev, |
567 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
568 | { |
569 | struct net_bridge_port *p; | |
570 | int err = 0; | |
45493d47 | 571 | unsigned br_hr, dev_hr; |
a019abd8 | 572 | bool changed_addr, fdb_synced = false; |
1da177e4 | 573 | |
9eb8eff0 | 574 | /* Don't allow bridging non-ethernet like devices. */ |
1056bd51 | 575 | if ((dev->flags & IFF_LOOPBACK) || |
77f98598 | 576 | dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN || |
9eb8eff0 | 577 | !is_valid_ether_addr(dev->dev_addr)) |
1da177e4 LT |
578 | return -EINVAL; |
579 | ||
1056bd51 | 580 | /* No bridging of bridges */ |
ca752be0 DA |
581 | if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit) { |
582 | NL_SET_ERR_MSG(extack, | |
583 | "Can not enslave a bridge to a bridge"); | |
1da177e4 | 584 | return -ELOOP; |
ca752be0 | 585 | } |
1da177e4 | 586 | |
e8238fc2 HL |
587 | /* Device has master upper dev */ |
588 | if (netdev_master_upper_dev_get(dev)) | |
1da177e4 LT |
589 | return -EBUSY; |
590 | ||
ad4bb6f8 | 591 | /* No bridging devices that dislike that (e.g. wireless) */ |
ca752be0 DA |
592 | if (dev->priv_flags & IFF_DONT_BRIDGE) { |
593 | NL_SET_ERR_MSG(extack, | |
594 | "Device does not allow enslaving to a bridge"); | |
ad4bb6f8 | 595 | return -EOPNOTSUPP; |
ca752be0 | 596 | } |
ad4bb6f8 | 597 | |
bab1deea SH |
598 | p = new_nbp(br, dev); |
599 | if (IS_ERR(p)) | |
1da177e4 LT |
600 | return PTR_ERR(p); |
601 | ||
bb8ed630 AW |
602 | call_netdevice_notifiers(NETDEV_JOIN, dev); |
603 | ||
2796d0c6 | 604 | err = dev_set_allmulti(dev, 1); |
bdfad5ae | 605 | if (err) { |
519133de | 606 | br_multicast_del_port(p); |
d62607c3 | 607 | netdev_put(dev, &p->dev_tracker); |
bdfad5ae TH |
608 | kfree(p); /* kobject not yet init'd, manually free */ |
609 | goto err1; | |
610 | } | |
bc3f9076 | 611 | |
e32cc736 GKH |
612 | err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), |
613 | SYSFS_BRIDGE_PORT_ATTR); | |
bab1deea | 614 | if (err) |
bdfad5ae | 615 | goto err2; |
1da177e4 | 616 | |
bab1deea SH |
617 | err = br_sysfs_addif(p); |
618 | if (err) | |
619 | goto err2; | |
1da177e4 | 620 | |
a8779ec1 | 621 | err = br_netpoll_enable(p); |
93d8bf9f | 622 | if (err) |
91d2c34a HX |
623 | goto err3; |
624 | ||
9eb8eff0 | 625 | err = netdev_rx_handler_register(dev, br_get_rx_handler(dev), p); |
ab95bfe0 | 626 | if (err) |
9b1536c4 | 627 | goto err4; |
f350a0a8 | 628 | |
0f49579a JP |
629 | dev->priv_flags |= IFF_BRIDGE_PORT; |
630 | ||
ca752be0 | 631 | err = netdev_master_upper_dev_link(dev, br->dev, NULL, NULL, extack); |
afc6151a | 632 | if (err) |
9b1536c4 | 633 | goto err5; |
afc6151a | 634 | |
0187bdfb | 635 | dev_disable_lro(dev); |
bab1deea SH |
636 | |
637 | list_add_rcu(&p->list, &br->port_list); | |
638 | ||
e028e4b8 | 639 | nbp_update_port_count(br); |
a019abd8 WB |
640 | if (!br_promisc_port(p) && (p->dev->priv_flags & IFF_UNICAST_FLT)) { |
641 | /* When updating the port count we also update all ports' | |
642 | * promiscuous mode. | |
643 | * A port leaving promiscuous mode normally gets the bridge's | |
644 | * fdb synced to the unicast filter (if supported), however, | |
645 | * `br_port_clear_promisc` does not distinguish between | |
646 | * non-promiscuous ports and *new* ports, so we need to | |
647 | * sync explicitly here. | |
648 | */ | |
649 | fdb_synced = br_fdb_sync_static(br, p) == 0; | |
650 | if (!fdb_synced) | |
651 | netdev_err(dev, "failed to sync bridge static fdb addresses to this port\n"); | |
652 | } | |
e028e4b8 | 653 | |
c4d27ef9 MM |
654 | netdev_update_features(br->dev); |
655 | ||
45493d47 PA |
656 | br_hr = br->dev->needed_headroom; |
657 | dev_hr = netdev_get_fwd_headroom(dev); | |
658 | if (br_hr < dev_hr) | |
659 | update_headroom(br, dev_hr); | |
660 | else | |
661 | netdev_set_rx_headroom(dev, br_hr); | |
fd094808 | 662 | |
f6814fdc | 663 | if (br_fdb_add_local(br, p, dev->dev_addr, 0)) |
a4b816d8 TM |
664 | netdev_err(dev, "failed insert local address bridge forwarding table\n"); |
665 | ||
ca935da7 PM |
666 | if (br->dev->addr_assign_type != NET_ADDR_SET) { |
667 | /* Ask for permission to use this MAC address now, even if we | |
668 | * don't end up choosing it below. | |
669 | */ | |
670 | err = dev_pre_changeaddr_notify(br->dev, dev->dev_addr, extack); | |
671 | if (err) | |
2f5dc00f | 672 | goto err6; |
ca935da7 PM |
673 | } |
674 | ||
169327d5 | 675 | err = nbp_vlan_init(p, extack); |
08474cc1 | 676 | if (err) { |
5be5a2df | 677 | netdev_err(dev, "failed to initialize vlan filtering on this port\n"); |
2f5dc00f | 678 | goto err6; |
08474cc1 | 679 | } |
5be5a2df | 680 | |
bab1deea | 681 | spin_lock_bh(&br->lock); |
edf947f1 | 682 | changed_addr = br_stp_recalculate_bridge_id(br); |
de79059e | 683 | |
576eb625 | 684 | if (netif_running(dev) && netif_oper_up(dev) && |
de79059e AS |
685 | (br->dev->flags & IFF_UP)) |
686 | br_stp_enable_port(p); | |
bab1deea SH |
687 | spin_unlock_bh(&br->lock); |
688 | ||
92899063 | 689 | br_ifinfo_notify(RTM_NEWLINK, NULL, p); |
b86c4503 | 690 | |
edf947f1 | 691 | if (changed_addr) |
56139fc5 | 692 | call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); |
edf947f1 | 693 | |
804b854d | 694 | br_mtu_auto_adjust(br); |
ae74f100 | 695 | br_set_gso_limits(br); |
269def7c | 696 | |
bab1deea | 697 | kobject_uevent(&p->kobj, KOBJ_ADD); |
1da177e4 | 698 | |
bab1deea | 699 | return 0; |
afc6151a | 700 | |
2f5dc00f | 701 | err6: |
a019abd8 WB |
702 | if (fdb_synced) |
703 | br_fdb_unsync_static(br, p); | |
08474cc1 ER |
704 | list_del_rcu(&p->list); |
705 | br_fdb_delete_by_port(br, p, 0, 1); | |
706 | nbp_update_port_count(br); | |
707 | netdev_upper_dev_unlink(dev, br->dev); | |
9b1536c4 | 708 | err5: |
0f49579a JP |
709 | dev->priv_flags &= ~IFF_BRIDGE_PORT; |
710 | netdev_rx_handler_unregister(dev); | |
9b1536c4 G |
711 | err4: |
712 | br_netpoll_disable(p); | |
91d2c34a HX |
713 | err3: |
714 | sysfs_remove_link(br->ifobj, p->dev->name); | |
bab1deea | 715 | err2: |
519133de | 716 | br_multicast_del_port(p); |
d62607c3 | 717 | netdev_put(dev, &p->dev_tracker); |
c587aea9 | 718 | kobject_put(&p->kobj); |
019ee792 | 719 | dev_set_allmulti(dev, -1); |
bdfad5ae | 720 | err1: |
1da177e4 LT |
721 | return err; |
722 | } | |
723 | ||
724 | /* called with RTNL */ | |
725 | int br_del_if(struct net_bridge *br, struct net_device *dev) | |
726 | { | |
f350a0a8 | 727 | struct net_bridge_port *p; |
9be6dd65 | 728 | bool changed_addr; |
f350a0a8 | 729 | |
ec1e5610 | 730 | p = br_port_get_rtnl(dev); |
b5ed54e9 | 731 | if (!p || p->br != br) |
1da177e4 LT |
732 | return -EINVAL; |
733 | ||
d30362c0 AW |
734 | /* Since more than one interface can be attached to a bridge, |
735 | * there still maybe an alternate path for netconsole to use; | |
736 | * therefore there is no reason for a NETDEV_RELEASE event. | |
737 | */ | |
1da177e4 LT |
738 | del_nbp(p); |
739 | ||
804b854d | 740 | br_mtu_auto_adjust(br); |
ae74f100 | 741 | br_set_gso_limits(br); |
4c906c27 | 742 | |
1da177e4 | 743 | spin_lock_bh(&br->lock); |
9be6dd65 | 744 | changed_addr = br_stp_recalculate_bridge_id(br); |
1da177e4 LT |
745 | spin_unlock_bh(&br->lock); |
746 | ||
9be6dd65 AW |
747 | if (changed_addr) |
748 | call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); | |
749 | ||
c4d27ef9 MM |
750 | netdev_update_features(br->dev); |
751 | ||
1da177e4 LT |
752 | return 0; |
753 | } | |
e028e4b8 VY |
754 | |
755 | void br_port_flags_change(struct net_bridge_port *p, unsigned long mask) | |
756 | { | |
757 | struct net_bridge *br = p->br; | |
758 | ||
759 | if (mask & BR_AUTO_MASK) | |
760 | nbp_update_port_count(br); | |
821f1b21 | 761 | |
6be42ed0 | 762 | if (mask & (BR_NEIGH_SUPPRESS | BR_NEIGH_VLAN_SUPPRESS)) |
821f1b21 | 763 | br_recalculate_neigh_suppress_enabled(br); |
e028e4b8 | 764 | } |
085ddc87 IS |
765 | |
766 | bool br_port_flag_is_set(const struct net_device *dev, unsigned long flag) | |
767 | { | |
768 | struct net_bridge_port *p; | |
769 | ||
770 | p = br_port_get_rtnl_rcu(dev); | |
771 | if (!p) | |
772 | return false; | |
773 | ||
774 | return p->flags & flag; | |
775 | } | |
776 | EXPORT_SYMBOL_GPL(br_port_flag_is_set); |