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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Userspace interface | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * | |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/netdevice.h> | |
77f98598 | 16 | #include <linux/etherdevice.h> |
c06ee961 | 17 | #include <linux/netpoll.h> |
1da177e4 LT |
18 | #include <linux/ethtool.h> |
19 | #include <linux/if_arp.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/rtnetlink.h> | |
46f25dff | 23 | #include <linux/if_ether.h> |
5a0e3ad6 | 24 | #include <linux/slab.h> |
1da177e4 | 25 | #include <net/sock.h> |
407af329 | 26 | #include <linux/if_vlan.h> |
1da177e4 LT |
27 | |
28 | #include "br_private.h" | |
29 | ||
30 | /* | |
31 | * Determine initial path cost based on speed. | |
32 | * using recommendations from 802.1d standard | |
33 | * | |
61a44b9c | 34 | * Since driver might sleep need to not be holding any locks. |
1da177e4 | 35 | */ |
4433f420 | 36 | static int port_cost(struct net_device *dev) |
1da177e4 | 37 | { |
fa3df928 | 38 | struct ethtool_cmd ecmd; |
b4a488d1 | 39 | |
4bc71cb9 | 40 | if (!__ethtool_get_settings(dev, &ecmd)) { |
fa3df928 JP |
41 | switch (ethtool_cmd_speed(&ecmd)) { |
42 | case SPEED_10000: | |
43 | return 2; | |
44 | case SPEED_1000: | |
45 | return 4; | |
46 | case SPEED_100: | |
47 | return 19; | |
48 | case SPEED_10: | |
49 | return 100; | |
1da177e4 LT |
50 | } |
51 | } | |
52 | ||
53 | /* Old silly heuristics based on name */ | |
54 | if (!strncmp(dev->name, "lec", 3)) | |
55 | return 7; | |
56 | ||
57 | if (!strncmp(dev->name, "plip", 4)) | |
58 | return 2500; | |
59 | ||
60 | return 100; /* assume old 10Mbps */ | |
61 | } | |
62 | ||
4433f420 | 63 | |
1a81a2e0 | 64 | /* Check for port carrier transitions. */ |
269def7c | 65 | void br_port_carrier_check(struct net_bridge_port *p) |
4433f420 | 66 | { |
269def7c SH |
67 | struct net_device *dev = p->dev; |
68 | struct net_bridge *br = p->br; | |
6e86b890 | 69 | |
8f3359bd | 70 | if (!(p->flags & BR_ADMIN_COST) && |
71 | netif_running(dev) && netif_oper_up(dev)) | |
6e86b890 SH |
72 | p->path_cost = port_cost(dev); |
73 | ||
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)) { |
aa7c6e5f | 79 | if (p->state == BR_STATE_DISABLED) |
80 | br_stp_enable_port(p); | |
81 | } else { | |
82 | if (p->state != BR_STATE_DISABLED) | |
83 | br_stp_disable_port(p); | |
4433f420 | 84 | } |
aa7c6e5f | 85 | spin_unlock_bh(&br->lock); |
4433f420 SH |
86 | } |
87 | ||
e028e4b8 VY |
88 | static void nbp_update_port_count(struct net_bridge *br) |
89 | { | |
90 | struct net_bridge_port *p; | |
91 | u32 cnt = 0; | |
92 | ||
93 | list_for_each_entry(p, &br->port_list, list) { | |
94 | if (br_auto_port(p)) | |
95 | cnt++; | |
96 | } | |
97 | br->auto_cnt = cnt; | |
98 | } | |
99 | ||
bab1deea SH |
100 | static void release_nbp(struct kobject *kobj) |
101 | { | |
102 | struct net_bridge_port *p | |
103 | = container_of(kobj, struct net_bridge_port, kobj); | |
104 | kfree(p); | |
105 | } | |
106 | ||
107 | static struct kobj_type brport_ktype = { | |
108 | #ifdef CONFIG_SYSFS | |
109 | .sysfs_ops = &brport_sysfs_ops, | |
110 | #endif | |
111 | .release = release_nbp, | |
112 | }; | |
113 | ||
1da177e4 LT |
114 | static void destroy_nbp(struct net_bridge_port *p) |
115 | { | |
116 | struct net_device *dev = p->dev; | |
117 | ||
1da177e4 LT |
118 | p->br = NULL; |
119 | p->dev = NULL; | |
120 | dev_put(dev); | |
121 | ||
bab1deea | 122 | kobject_put(&p->kobj); |
1da177e4 LT |
123 | } |
124 | ||
125 | static void destroy_nbp_rcu(struct rcu_head *head) | |
126 | { | |
127 | struct net_bridge_port *p = | |
128 | container_of(head, struct net_bridge_port, rcu); | |
129 | destroy_nbp(p); | |
130 | } | |
131 | ||
3f4cfc2d SH |
132 | /* Delete port(interface) from bridge is done in two steps. |
133 | * via RCU. First step, marks device as down. That deletes | |
134 | * all the timers and stops new packets from flowing through. | |
135 | * | |
136 | * Final cleanup doesn't occur until after all CPU's finished | |
137 | * processing packets. | |
138 | * | |
139 | * Protected from multiple admin operations by RTNL mutex | |
140 | */ | |
1da177e4 LT |
141 | static void del_nbp(struct net_bridge_port *p) |
142 | { | |
143 | struct net_bridge *br = p->br; | |
144 | struct net_device *dev = p->dev; | |
145 | ||
b3bcb72e | 146 | sysfs_remove_link(br->ifobj, p->dev->name); |
bab1deea | 147 | |
1da177e4 LT |
148 | dev_set_promiscuity(dev, -1); |
149 | ||
150 | spin_lock_bh(&br->lock); | |
151 | br_stp_disable_port(p); | |
152 | spin_unlock_bh(&br->lock); | |
153 | ||
b86c4503 SH |
154 | br_ifinfo_notify(RTM_DELLINK, p); |
155 | ||
243a2e63 | 156 | nbp_vlan_flush(p); |
1a620698 | 157 | br_fdb_delete_by_port(br, p, 1); |
1da177e4 LT |
158 | |
159 | list_del_rcu(&p->list); | |
160 | ||
e028e4b8 VY |
161 | nbp_update_port_count(br); |
162 | ||
f350a0a8 JP |
163 | dev->priv_flags &= ~IFF_BRIDGE_PORT; |
164 | ||
ab95bfe0 | 165 | netdev_rx_handler_unregister(dev); |
b3f1be4b | 166 | |
74fdd93f | 167 | netdev_upper_dev_unlink(dev, br->dev); |
afc6151a | 168 | |
3fe2d7c7 HX |
169 | br_multicast_del_port(p); |
170 | ||
125a12cc | 171 | kobject_uevent(&p->kobj, KOBJ_REMOVE); |
bab1deea SH |
172 | kobject_del(&p->kobj); |
173 | ||
91d2c34a HX |
174 | br_netpoll_disable(p); |
175 | ||
1da177e4 LT |
176 | call_rcu(&p->rcu, destroy_nbp_rcu); |
177 | } | |
178 | ||
1ce5cce8 | 179 | /* Delete bridge device */ |
180 | void br_dev_delete(struct net_device *dev, struct list_head *head) | |
1da177e4 | 181 | { |
1ce5cce8 | 182 | struct net_bridge *br = netdev_priv(dev); |
1da177e4 LT |
183 | struct net_bridge_port *p, *n; |
184 | ||
185 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
1da177e4 LT |
186 | del_nbp(p); |
187 | } | |
188 | ||
f8730420 DT |
189 | br_fdb_delete_by_port(br, NULL, 1); |
190 | ||
b4e09b29 | 191 | br_vlan_flush(br); |
1da177e4 LT |
192 | del_timer_sync(&br->gc_timer); |
193 | ||
194 | br_sysfs_delbr(br->dev); | |
8c56ba05 | 195 | unregister_netdevice_queue(br->dev, head); |
1da177e4 LT |
196 | } |
197 | ||
1da177e4 LT |
198 | /* find an available port number */ |
199 | static int find_portno(struct net_bridge *br) | |
200 | { | |
201 | int index; | |
202 | struct net_bridge_port *p; | |
203 | unsigned long *inuse; | |
204 | ||
3b781fa1 | 205 | inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long), |
1da177e4 LT |
206 | GFP_KERNEL); |
207 | if (!inuse) | |
208 | return -ENOMEM; | |
209 | ||
1da177e4 LT |
210 | set_bit(0, inuse); /* zero is reserved */ |
211 | list_for_each_entry(p, &br->port_list, list) { | |
212 | set_bit(p->port_no, inuse); | |
213 | } | |
214 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); | |
215 | kfree(inuse); | |
216 | ||
217 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; | |
218 | } | |
219 | ||
4433f420 | 220 | /* called with RTNL but without bridge lock */ |
9d6f229f | 221 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
4433f420 | 222 | struct net_device *dev) |
1da177e4 LT |
223 | { |
224 | int index; | |
225 | struct net_bridge_port *p; | |
9d6f229f | 226 | |
1da177e4 LT |
227 | index = find_portno(br); |
228 | if (index < 0) | |
229 | return ERR_PTR(index); | |
230 | ||
cee48541 | 231 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 LT |
232 | if (p == NULL) |
233 | return ERR_PTR(-ENOMEM); | |
234 | ||
1da177e4 LT |
235 | p->br = br; |
236 | dev_hold(dev); | |
237 | p->dev = dev; | |
4433f420 | 238 | p->path_cost = port_cost(dev); |
9d6f229f | 239 | p->priority = 0x8000 >> BR_PORT_BITS; |
1da177e4 | 240 | p->port_no = index; |
f3a6ddf1 | 241 | p->flags = BR_LEARNING | BR_FLOOD | BR_PROMISC; |
1da177e4 LT |
242 | br_init_port(p); |
243 | p->state = BR_STATE_DISABLED; | |
d32439c0 | 244 | br_stp_port_timer_init(p); |
3fe2d7c7 | 245 | br_multicast_add_port(p); |
1da177e4 LT |
246 | |
247 | return p; | |
248 | } | |
249 | ||
4aa678ba | 250 | int br_add_bridge(struct net *net, const char *name) |
1da177e4 LT |
251 | { |
252 | struct net_device *dev; | |
11f3a6bd | 253 | int res; |
1da177e4 | 254 | |
bb900b27 | 255 | dev = alloc_netdev(sizeof(struct net_bridge), name, |
256 | br_dev_setup); | |
257 | ||
9d6f229f | 258 | if (!dev) |
1da177e4 LT |
259 | return -ENOMEM; |
260 | ||
bb900b27 | 261 | dev_net_set(dev, net); |
149ddd83 | 262 | dev->rtnl_link_ops = &br_link_ops; |
e340a90e | 263 | |
11f3a6bd ED |
264 | res = register_netdev(dev); |
265 | if (res) | |
266 | free_netdev(dev); | |
267 | return res; | |
1da177e4 LT |
268 | } |
269 | ||
4aa678ba | 270 | int br_del_bridge(struct net *net, const char *name) |
1da177e4 LT |
271 | { |
272 | struct net_device *dev; | |
273 | int ret = 0; | |
274 | ||
275 | rtnl_lock(); | |
4aa678ba | 276 | dev = __dev_get_by_name(net, name); |
9d6f229f | 277 | if (dev == NULL) |
1da177e4 LT |
278 | ret = -ENXIO; /* Could not find device */ |
279 | ||
280 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
281 | /* Attempt to delete non bridge device! */ | |
282 | ret = -EPERM; | |
283 | } | |
284 | ||
285 | else if (dev->flags & IFF_UP) { | |
286 | /* Not shutdown yet. */ | |
287 | ret = -EBUSY; | |
9d6f229f | 288 | } |
1da177e4 | 289 | |
9d6f229f | 290 | else |
1ce5cce8 | 291 | br_dev_delete(dev, NULL); |
1da177e4 LT |
292 | |
293 | rtnl_unlock(); | |
294 | return ret; | |
295 | } | |
296 | ||
46f25dff | 297 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
1da177e4 LT |
298 | int br_min_mtu(const struct net_bridge *br) |
299 | { | |
300 | const struct net_bridge_port *p; | |
301 | int mtu = 0; | |
302 | ||
303 | ASSERT_RTNL(); | |
304 | ||
305 | if (list_empty(&br->port_list)) | |
46f25dff | 306 | mtu = ETH_DATA_LEN; |
1da177e4 LT |
307 | else { |
308 | list_for_each_entry(p, &br->port_list, list) { | |
309 | if (!mtu || p->dev->mtu < mtu) | |
310 | mtu = p->dev->mtu; | |
311 | } | |
312 | } | |
313 | return mtu; | |
314 | } | |
315 | ||
81d35307 SH |
316 | /* |
317 | * Recomputes features using slave's features | |
318 | */ | |
c8f44aff MM |
319 | netdev_features_t br_features_recompute(struct net_bridge *br, |
320 | netdev_features_t features) | |
81d35307 SH |
321 | { |
322 | struct net_bridge_port *p; | |
c8f44aff | 323 | netdev_features_t mask; |
81d35307 | 324 | |
b63365a2 | 325 | if (list_empty(&br->port_list)) |
c4d27ef9 | 326 | return features; |
b63365a2 | 327 | |
c4d27ef9 | 328 | mask = features; |
b63365a2 | 329 | features &= ~NETIF_F_ONE_FOR_ALL; |
81d35307 SH |
330 | |
331 | list_for_each_entry(p, &br->port_list, list) { | |
b63365a2 HX |
332 | features = netdev_increment_features(features, |
333 | p->dev->features, mask); | |
81d35307 SH |
334 | } |
335 | ||
c4d27ef9 | 336 | return features; |
81d35307 SH |
337 | } |
338 | ||
1da177e4 LT |
339 | /* called with RTNL */ |
340 | int br_add_if(struct net_bridge *br, struct net_device *dev) | |
341 | { | |
342 | struct net_bridge_port *p; | |
343 | int err = 0; | |
edf947f1 | 344 | bool changed_addr; |
1da177e4 | 345 | |
1056bd51 SH |
346 | /* Don't allow bridging non-ethernet like devices */ |
347 | if ((dev->flags & IFF_LOOPBACK) || | |
77f98598 | 348 | dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN || |
349 | !is_valid_ether_addr(dev->dev_addr)) | |
1da177e4 LT |
350 | return -EINVAL; |
351 | ||
1056bd51 | 352 | /* No bridging of bridges */ |
00829823 | 353 | if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit) |
1da177e4 LT |
354 | return -ELOOP; |
355 | ||
1056bd51 | 356 | /* Device is already being bridged */ |
f350a0a8 | 357 | if (br_port_exists(dev)) |
1da177e4 LT |
358 | return -EBUSY; |
359 | ||
ad4bb6f8 JB |
360 | /* No bridging devices that dislike that (e.g. wireless) */ |
361 | if (dev->priv_flags & IFF_DONT_BRIDGE) | |
362 | return -EOPNOTSUPP; | |
363 | ||
bab1deea SH |
364 | p = new_nbp(br, dev); |
365 | if (IS_ERR(p)) | |
1da177e4 LT |
366 | return PTR_ERR(p); |
367 | ||
bb8ed630 AW |
368 | call_netdevice_notifiers(NETDEV_JOIN, dev); |
369 | ||
bc3f9076 WC |
370 | err = dev_set_promiscuity(dev, 1); |
371 | if (err) | |
372 | goto put_back; | |
373 | ||
e32cc736 GKH |
374 | err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), |
375 | SYSFS_BRIDGE_PORT_ATTR); | |
bab1deea SH |
376 | if (err) |
377 | goto err1; | |
1da177e4 | 378 | |
bab1deea SH |
379 | err = br_sysfs_addif(p); |
380 | if (err) | |
381 | goto err2; | |
1da177e4 | 382 | |
a8779ec1 | 383 | err = br_netpoll_enable(p); |
93d8bf9f | 384 | if (err) |
91d2c34a HX |
385 | goto err3; |
386 | ||
74fdd93f | 387 | err = netdev_master_upper_dev_link(dev, br->dev); |
ab95bfe0 | 388 | if (err) |
9b1536c4 | 389 | goto err4; |
f350a0a8 | 390 | |
afc6151a JP |
391 | err = netdev_rx_handler_register(dev, br_handle_frame, p); |
392 | if (err) | |
9b1536c4 | 393 | goto err5; |
afc6151a | 394 | |
f350a0a8 | 395 | dev->priv_flags |= IFF_BRIDGE_PORT; |
ab95bfe0 | 396 | |
0187bdfb | 397 | dev_disable_lro(dev); |
bab1deea SH |
398 | |
399 | list_add_rcu(&p->list, &br->port_list); | |
400 | ||
e028e4b8 VY |
401 | nbp_update_port_count(br); |
402 | ||
c4d27ef9 MM |
403 | netdev_update_features(br->dev); |
404 | ||
fd094808 FF |
405 | if (br->dev->needed_headroom < dev->needed_headroom) |
406 | br->dev->needed_headroom = dev->needed_headroom; | |
407 | ||
a4b816d8 TM |
408 | if (br_fdb_insert(br, p, dev->dev_addr, 0)) |
409 | netdev_err(dev, "failed insert local address bridge forwarding table\n"); | |
410 | ||
bab1deea | 411 | spin_lock_bh(&br->lock); |
edf947f1 | 412 | changed_addr = br_stp_recalculate_bridge_id(br); |
de79059e | 413 | |
576eb625 | 414 | if (netif_running(dev) && netif_oper_up(dev) && |
de79059e AS |
415 | (br->dev->flags & IFF_UP)) |
416 | br_stp_enable_port(p); | |
bab1deea SH |
417 | spin_unlock_bh(&br->lock); |
418 | ||
b86c4503 SH |
419 | br_ifinfo_notify(RTM_NEWLINK, p); |
420 | ||
edf947f1 | 421 | if (changed_addr) |
56139fc5 | 422 | call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); |
edf947f1 | 423 | |
bab1deea | 424 | dev_set_mtu(br->dev, br_min_mtu(br)); |
269def7c | 425 | |
bab1deea | 426 | kobject_uevent(&p->kobj, KOBJ_ADD); |
1da177e4 | 427 | |
bab1deea | 428 | return 0; |
afc6151a | 429 | |
9b1536c4 | 430 | err5: |
74fdd93f | 431 | netdev_upper_dev_unlink(dev, br->dev); |
9b1536c4 G |
432 | err4: |
433 | br_netpoll_disable(p); | |
91d2c34a HX |
434 | err3: |
435 | sysfs_remove_link(br->ifobj, p->dev->name); | |
bab1deea | 436 | err2: |
c587aea9 | 437 | kobject_put(&p->kobj); |
30df94f8 | 438 | p = NULL; /* kobject_put frees */ |
77f98598 | 439 | err1: |
bc3f9076 | 440 | dev_set_promiscuity(dev, -1); |
43af8532 VL |
441 | put_back: |
442 | dev_put(dev); | |
bc3f9076 | 443 | kfree(p); |
1da177e4 LT |
444 | return err; |
445 | } | |
446 | ||
447 | /* called with RTNL */ | |
448 | int br_del_if(struct net_bridge *br, struct net_device *dev) | |
449 | { | |
f350a0a8 | 450 | struct net_bridge_port *p; |
9be6dd65 | 451 | bool changed_addr; |
f350a0a8 | 452 | |
ec1e5610 | 453 | p = br_port_get_rtnl(dev); |
b5ed54e9 | 454 | if (!p || p->br != br) |
1da177e4 LT |
455 | return -EINVAL; |
456 | ||
d30362c0 AW |
457 | /* Since more than one interface can be attached to a bridge, |
458 | * there still maybe an alternate path for netconsole to use; | |
459 | * therefore there is no reason for a NETDEV_RELEASE event. | |
460 | */ | |
1da177e4 LT |
461 | del_nbp(p); |
462 | ||
463 | spin_lock_bh(&br->lock); | |
9be6dd65 | 464 | changed_addr = br_stp_recalculate_bridge_id(br); |
1da177e4 LT |
465 | spin_unlock_bh(&br->lock); |
466 | ||
9be6dd65 AW |
467 | if (changed_addr) |
468 | call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); | |
469 | ||
c4d27ef9 MM |
470 | netdev_update_features(br->dev); |
471 | ||
1da177e4 LT |
472 | return 0; |
473 | } | |
e028e4b8 VY |
474 | |
475 | void br_port_flags_change(struct net_bridge_port *p, unsigned long mask) | |
476 | { | |
477 | struct net_bridge *br = p->br; | |
478 | ||
479 | if (mask & BR_AUTO_MASK) | |
480 | nbp_update_port_count(br); | |
481 | } |