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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> | |
c06ee961 | 16 | #include <linux/netpoll.h> |
1da177e4 LT |
17 | #include <linux/ethtool.h> |
18 | #include <linux/if_arp.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/rtnetlink.h> | |
46f25dff | 22 | #include <linux/if_ether.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
1da177e4 LT |
24 | #include <net/sock.h> |
25 | ||
26 | #include "br_private.h" | |
27 | ||
28 | /* | |
29 | * Determine initial path cost based on speed. | |
30 | * using recommendations from 802.1d standard | |
31 | * | |
61a44b9c | 32 | * Since driver might sleep need to not be holding any locks. |
1da177e4 | 33 | */ |
4433f420 | 34 | static int port_cost(struct net_device *dev) |
1da177e4 | 35 | { |
b4a488d1 SH |
36 | if (dev->ethtool_ops && dev->ethtool_ops->get_settings) { |
37 | struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET, }; | |
38 | ||
39 | if (!dev->ethtool_ops->get_settings(dev, &ecmd)) { | |
61a44b9c | 40 | switch(ecmd.speed) { |
61a44b9c MW |
41 | case SPEED_10000: |
42 | return 2; | |
b4a488d1 SH |
43 | case SPEED_1000: |
44 | return 4; | |
45 | case SPEED_100: | |
46 | return 19; | |
61a44b9c MW |
47 | case SPEED_10: |
48 | return 100; | |
49 | } | |
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 | |
944c794d | 64 | /* Check for port carrier transistions. */ |
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 | |
aa7c6e5f | 70 | if (netif_running(dev) && netif_carrier_ok(dev)) |
6e86b890 SH |
71 | p->path_cost = port_cost(dev); |
72 | ||
aa7c6e5f | 73 | if (!netif_running(br->dev)) |
74 | return; | |
75 | ||
76 | spin_lock_bh(&br->lock); | |
77 | if (netif_running(dev) && netif_carrier_ok(dev)) { | |
78 | if (p->state == BR_STATE_DISABLED) | |
79 | br_stp_enable_port(p); | |
80 | } else { | |
81 | if (p->state != BR_STATE_DISABLED) | |
82 | br_stp_disable_port(p); | |
4433f420 | 83 | } |
aa7c6e5f | 84 | spin_unlock_bh(&br->lock); |
4433f420 SH |
85 | } |
86 | ||
bab1deea SH |
87 | static void release_nbp(struct kobject *kobj) |
88 | { | |
89 | struct net_bridge_port *p | |
90 | = container_of(kobj, struct net_bridge_port, kobj); | |
91 | kfree(p); | |
92 | } | |
93 | ||
94 | static struct kobj_type brport_ktype = { | |
95 | #ifdef CONFIG_SYSFS | |
96 | .sysfs_ops = &brport_sysfs_ops, | |
97 | #endif | |
98 | .release = release_nbp, | |
99 | }; | |
100 | ||
1da177e4 LT |
101 | static void destroy_nbp(struct net_bridge_port *p) |
102 | { | |
103 | struct net_device *dev = p->dev; | |
104 | ||
1da177e4 LT |
105 | p->br = NULL; |
106 | p->dev = NULL; | |
107 | dev_put(dev); | |
108 | ||
bab1deea | 109 | kobject_put(&p->kobj); |
1da177e4 LT |
110 | } |
111 | ||
112 | static void destroy_nbp_rcu(struct rcu_head *head) | |
113 | { | |
114 | struct net_bridge_port *p = | |
115 | container_of(head, struct net_bridge_port, rcu); | |
116 | destroy_nbp(p); | |
117 | } | |
118 | ||
3f4cfc2d SH |
119 | /* Delete port(interface) from bridge is done in two steps. |
120 | * via RCU. First step, marks device as down. That deletes | |
121 | * all the timers and stops new packets from flowing through. | |
122 | * | |
123 | * Final cleanup doesn't occur until after all CPU's finished | |
124 | * processing packets. | |
125 | * | |
126 | * Protected from multiple admin operations by RTNL mutex | |
127 | */ | |
1da177e4 LT |
128 | static void del_nbp(struct net_bridge_port *p) |
129 | { | |
130 | struct net_bridge *br = p->br; | |
131 | struct net_device *dev = p->dev; | |
132 | ||
b3bcb72e | 133 | sysfs_remove_link(br->ifobj, p->dev->name); |
bab1deea | 134 | |
1da177e4 LT |
135 | dev_set_promiscuity(dev, -1); |
136 | ||
137 | spin_lock_bh(&br->lock); | |
138 | br_stp_disable_port(p); | |
139 | spin_unlock_bh(&br->lock); | |
140 | ||
b86c4503 SH |
141 | br_ifinfo_notify(RTM_DELLINK, p); |
142 | ||
1a620698 | 143 | br_fdb_delete_by_port(br, p, 1); |
1da177e4 LT |
144 | |
145 | list_del_rcu(&p->list); | |
146 | ||
f350a0a8 JP |
147 | dev->priv_flags &= ~IFF_BRIDGE_PORT; |
148 | ||
ab95bfe0 | 149 | netdev_rx_handler_unregister(dev); |
b3f1be4b | 150 | |
afc6151a JP |
151 | netdev_set_master(dev, NULL); |
152 | ||
3fe2d7c7 HX |
153 | br_multicast_del_port(p); |
154 | ||
125a12cc | 155 | kobject_uevent(&p->kobj, KOBJ_REMOVE); |
bab1deea SH |
156 | kobject_del(&p->kobj); |
157 | ||
91d2c34a HX |
158 | br_netpoll_disable(p); |
159 | ||
1da177e4 LT |
160 | call_rcu(&p->rcu, destroy_nbp_rcu); |
161 | } | |
162 | ||
163 | /* called with RTNL */ | |
8c56ba05 | 164 | static void del_br(struct net_bridge *br, struct list_head *head) |
1da177e4 LT |
165 | { |
166 | struct net_bridge_port *p, *n; | |
167 | ||
168 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
1da177e4 LT |
169 | del_nbp(p); |
170 | } | |
171 | ||
172 | del_timer_sync(&br->gc_timer); | |
173 | ||
174 | br_sysfs_delbr(br->dev); | |
8c56ba05 | 175 | unregister_netdevice_queue(br->dev, head); |
1da177e4 LT |
176 | } |
177 | ||
4aa678ba | 178 | static struct net_device *new_bridge_dev(struct net *net, const char *name) |
1da177e4 LT |
179 | { |
180 | struct net_bridge *br; | |
181 | struct net_device *dev; | |
182 | ||
183 | dev = alloc_netdev(sizeof(struct net_bridge), name, | |
184 | br_dev_setup); | |
9d6f229f | 185 | |
1da177e4 LT |
186 | if (!dev) |
187 | return NULL; | |
4aa678ba | 188 | dev_net_set(dev, net); |
1da177e4 LT |
189 | |
190 | br = netdev_priv(dev); | |
191 | br->dev = dev; | |
192 | ||
14bb4789 | 193 | br->stats = alloc_percpu(struct br_cpu_netstats); |
194 | if (!br->stats) { | |
195 | free_netdev(dev); | |
196 | return NULL; | |
197 | } | |
198 | ||
1da177e4 LT |
199 | spin_lock_init(&br->lock); |
200 | INIT_LIST_HEAD(&br->port_list); | |
201 | spin_lock_init(&br->hash_lock); | |
202 | ||
203 | br->bridge_id.prio[0] = 0x80; | |
204 | br->bridge_id.prio[1] = 0x00; | |
cee48541 SH |
205 | |
206 | memcpy(br->group_addr, br_group_address, ETH_ALEN); | |
1da177e4 | 207 | |
edb5e46f | 208 | br->feature_mask = dev->features; |
9cde0708 | 209 | br->stp_enabled = BR_NO_STP; |
1da177e4 LT |
210 | br->designated_root = br->bridge_id; |
211 | br->root_path_cost = 0; | |
212 | br->root_port = 0; | |
213 | br->bridge_max_age = br->max_age = 20 * HZ; | |
214 | br->bridge_hello_time = br->hello_time = 2 * HZ; | |
215 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; | |
216 | br->topology_change = 0; | |
217 | br->topology_change_detected = 0; | |
218 | br->ageing_time = 300 * HZ; | |
4adf0af6 SW |
219 | |
220 | br_netfilter_rtable_init(br); | |
221 | ||
1da177e4 | 222 | br_stp_timer_init(br); |
3fe2d7c7 | 223 | br_multicast_init(br); |
1da177e4 LT |
224 | |
225 | return dev; | |
226 | } | |
227 | ||
228 | /* find an available port number */ | |
229 | static int find_portno(struct net_bridge *br) | |
230 | { | |
231 | int index; | |
232 | struct net_bridge_port *p; | |
233 | unsigned long *inuse; | |
234 | ||
3b781fa1 | 235 | inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long), |
1da177e4 LT |
236 | GFP_KERNEL); |
237 | if (!inuse) | |
238 | return -ENOMEM; | |
239 | ||
1da177e4 LT |
240 | set_bit(0, inuse); /* zero is reserved */ |
241 | list_for_each_entry(p, &br->port_list, list) { | |
242 | set_bit(p->port_no, inuse); | |
243 | } | |
244 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); | |
245 | kfree(inuse); | |
246 | ||
247 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; | |
248 | } | |
249 | ||
4433f420 | 250 | /* called with RTNL but without bridge lock */ |
9d6f229f | 251 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
4433f420 | 252 | struct net_device *dev) |
1da177e4 LT |
253 | { |
254 | int index; | |
255 | struct net_bridge_port *p; | |
9d6f229f | 256 | |
1da177e4 LT |
257 | index = find_portno(br); |
258 | if (index < 0) | |
259 | return ERR_PTR(index); | |
260 | ||
cee48541 | 261 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 LT |
262 | if (p == NULL) |
263 | return ERR_PTR(-ENOMEM); | |
264 | ||
1da177e4 LT |
265 | p->br = br; |
266 | dev_hold(dev); | |
267 | p->dev = dev; | |
4433f420 | 268 | p->path_cost = port_cost(dev); |
9d6f229f | 269 | p->priority = 0x8000 >> BR_PORT_BITS; |
1da177e4 | 270 | p->port_no = index; |
3982d3d2 | 271 | p->flags = 0; |
1da177e4 LT |
272 | br_init_port(p); |
273 | p->state = BR_STATE_DISABLED; | |
d32439c0 | 274 | br_stp_port_timer_init(p); |
3fe2d7c7 | 275 | br_multicast_add_port(p); |
1da177e4 LT |
276 | |
277 | return p; | |
278 | } | |
279 | ||
384912ed MH |
280 | static struct device_type br_type = { |
281 | .name = "bridge", | |
282 | }; | |
283 | ||
4aa678ba | 284 | int br_add_bridge(struct net *net, const char *name) |
1da177e4 LT |
285 | { |
286 | struct net_device *dev; | |
287 | int ret; | |
288 | ||
4aa678ba | 289 | dev = new_bridge_dev(net, name); |
9d6f229f | 290 | if (!dev) |
1da177e4 LT |
291 | return -ENOMEM; |
292 | ||
293 | rtnl_lock(); | |
294 | if (strchr(dev->name, '%')) { | |
295 | ret = dev_alloc_name(dev, dev->name); | |
e340a90e PE |
296 | if (ret < 0) |
297 | goto out_free; | |
1da177e4 LT |
298 | } |
299 | ||
384912ed MH |
300 | SET_NETDEV_DEVTYPE(dev, &br_type); |
301 | ||
1da177e4 | 302 | ret = register_netdevice(dev); |
e340a90e PE |
303 | if (ret) |
304 | goto out_free; | |
1da177e4 | 305 | |
1da177e4 | 306 | ret = br_sysfs_addbr(dev); |
ac05202e | 307 | if (ret) |
36485707 JB |
308 | unregister_netdevice(dev); |
309 | out: | |
1da177e4 | 310 | rtnl_unlock(); |
ac05202e | 311 | return ret; |
e340a90e PE |
312 | |
313 | out_free: | |
314 | free_netdev(dev); | |
315 | goto out; | |
1da177e4 LT |
316 | } |
317 | ||
4aa678ba | 318 | int br_del_bridge(struct net *net, const char *name) |
1da177e4 LT |
319 | { |
320 | struct net_device *dev; | |
321 | int ret = 0; | |
322 | ||
323 | rtnl_lock(); | |
4aa678ba | 324 | dev = __dev_get_by_name(net, name); |
9d6f229f | 325 | if (dev == NULL) |
1da177e4 LT |
326 | ret = -ENXIO; /* Could not find device */ |
327 | ||
328 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
329 | /* Attempt to delete non bridge device! */ | |
330 | ret = -EPERM; | |
331 | } | |
332 | ||
333 | else if (dev->flags & IFF_UP) { | |
334 | /* Not shutdown yet. */ | |
335 | ret = -EBUSY; | |
9d6f229f | 336 | } |
1da177e4 | 337 | |
9d6f229f | 338 | else |
8c56ba05 | 339 | del_br(netdev_priv(dev), NULL); |
1da177e4 LT |
340 | |
341 | rtnl_unlock(); | |
342 | return ret; | |
343 | } | |
344 | ||
46f25dff | 345 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
1da177e4 LT |
346 | int br_min_mtu(const struct net_bridge *br) |
347 | { | |
348 | const struct net_bridge_port *p; | |
349 | int mtu = 0; | |
350 | ||
351 | ASSERT_RTNL(); | |
352 | ||
353 | if (list_empty(&br->port_list)) | |
46f25dff | 354 | mtu = ETH_DATA_LEN; |
1da177e4 LT |
355 | else { |
356 | list_for_each_entry(p, &br->port_list, list) { | |
357 | if (!mtu || p->dev->mtu < mtu) | |
358 | mtu = p->dev->mtu; | |
359 | } | |
360 | } | |
361 | return mtu; | |
362 | } | |
363 | ||
81d35307 SH |
364 | /* |
365 | * Recomputes features using slave's features | |
366 | */ | |
367 | void br_features_recompute(struct net_bridge *br) | |
368 | { | |
369 | struct net_bridge_port *p; | |
04ed3e74 | 370 | u32 features, mask; |
81d35307 | 371 | |
b63365a2 HX |
372 | features = mask = br->feature_mask; |
373 | if (list_empty(&br->port_list)) | |
374 | goto done; | |
375 | ||
376 | features &= ~NETIF_F_ONE_FOR_ALL; | |
81d35307 SH |
377 | |
378 | list_for_each_entry(p, &br->port_list, list) { | |
b63365a2 HX |
379 | features = netdev_increment_features(features, |
380 | p->dev->features, mask); | |
81d35307 SH |
381 | } |
382 | ||
b63365a2 | 383 | done: |
acd1130e | 384 | br->dev->features = netdev_fix_features(br->dev, features); |
81d35307 SH |
385 | } |
386 | ||
1da177e4 LT |
387 | /* called with RTNL */ |
388 | int br_add_if(struct net_bridge *br, struct net_device *dev) | |
389 | { | |
390 | struct net_bridge_port *p; | |
391 | int err = 0; | |
392 | ||
1056bd51 SH |
393 | /* Don't allow bridging non-ethernet like devices */ |
394 | if ((dev->flags & IFF_LOOPBACK) || | |
395 | dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN) | |
1da177e4 LT |
396 | return -EINVAL; |
397 | ||
1056bd51 | 398 | /* No bridging of bridges */ |
00829823 | 399 | if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit) |
1da177e4 LT |
400 | return -ELOOP; |
401 | ||
1056bd51 | 402 | /* Device is already being bridged */ |
f350a0a8 | 403 | if (br_port_exists(dev)) |
1da177e4 LT |
404 | return -EBUSY; |
405 | ||
ad4bb6f8 JB |
406 | /* No bridging devices that dislike that (e.g. wireless) */ |
407 | if (dev->priv_flags & IFF_DONT_BRIDGE) | |
408 | return -EOPNOTSUPP; | |
409 | ||
bab1deea SH |
410 | p = new_nbp(br, dev); |
411 | if (IS_ERR(p)) | |
1da177e4 LT |
412 | return PTR_ERR(p); |
413 | ||
bc3f9076 WC |
414 | err = dev_set_promiscuity(dev, 1); |
415 | if (err) | |
416 | goto put_back; | |
417 | ||
e32cc736 GKH |
418 | err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), |
419 | SYSFS_BRIDGE_PORT_ATTR); | |
bab1deea SH |
420 | if (err) |
421 | goto err0; | |
1da177e4 | 422 | |
9d6f229f | 423 | err = br_fdb_insert(br, p, dev->dev_addr); |
bab1deea SH |
424 | if (err) |
425 | goto err1; | |
1da177e4 | 426 | |
bab1deea SH |
427 | err = br_sysfs_addif(p); |
428 | if (err) | |
429 | goto err2; | |
1da177e4 | 430 | |
91d2c34a HX |
431 | if (br_netpoll_info(br) && ((err = br_netpoll_enable(p)))) |
432 | goto err3; | |
433 | ||
afc6151a | 434 | err = netdev_set_master(dev, br->dev); |
ab95bfe0 | 435 | if (err) |
f350a0a8 JP |
436 | goto err3; |
437 | ||
afc6151a JP |
438 | err = netdev_rx_handler_register(dev, br_handle_frame, p); |
439 | if (err) | |
440 | goto err4; | |
441 | ||
f350a0a8 | 442 | dev->priv_flags |= IFF_BRIDGE_PORT; |
ab95bfe0 | 443 | |
0187bdfb | 444 | dev_disable_lro(dev); |
bab1deea SH |
445 | |
446 | list_add_rcu(&p->list, &br->port_list); | |
447 | ||
448 | spin_lock_bh(&br->lock); | |
449 | br_stp_recalculate_bridge_id(br); | |
450 | br_features_recompute(br); | |
de79059e AS |
451 | |
452 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) && | |
453 | (br->dev->flags & IFF_UP)) | |
454 | br_stp_enable_port(p); | |
bab1deea SH |
455 | spin_unlock_bh(&br->lock); |
456 | ||
b86c4503 SH |
457 | br_ifinfo_notify(RTM_NEWLINK, p); |
458 | ||
bab1deea | 459 | dev_set_mtu(br->dev, br_min_mtu(br)); |
269def7c | 460 | |
bab1deea | 461 | kobject_uevent(&p->kobj, KOBJ_ADD); |
1da177e4 | 462 | |
bab1deea | 463 | return 0; |
afc6151a JP |
464 | |
465 | err4: | |
466 | netdev_set_master(dev, NULL); | |
91d2c34a HX |
467 | err3: |
468 | sysfs_remove_link(br->ifobj, p->dev->name); | |
bab1deea | 469 | err2: |
1a620698 | 470 | br_fdb_delete_by_port(br, p, 1); |
bab1deea | 471 | err1: |
c587aea9 | 472 | kobject_put(&p->kobj); |
30df94f8 | 473 | p = NULL; /* kobject_put frees */ |
bab1deea | 474 | err0: |
bc3f9076 | 475 | dev_set_promiscuity(dev, -1); |
43af8532 VL |
476 | put_back: |
477 | dev_put(dev); | |
bc3f9076 | 478 | kfree(p); |
1da177e4 LT |
479 | return err; |
480 | } | |
481 | ||
482 | /* called with RTNL */ | |
483 | int br_del_if(struct net_bridge *br, struct net_device *dev) | |
484 | { | |
f350a0a8 JP |
485 | struct net_bridge_port *p; |
486 | ||
ec1e5610 | 487 | p = br_port_get_rtnl(dev); |
b5ed54e9 | 488 | if (!p || p->br != br) |
1da177e4 LT |
489 | return -EINVAL; |
490 | ||
1da177e4 LT |
491 | del_nbp(p); |
492 | ||
493 | spin_lock_bh(&br->lock); | |
494 | br_stp_recalculate_bridge_id(br); | |
81d35307 | 495 | br_features_recompute(br); |
1da177e4 LT |
496 | spin_unlock_bh(&br->lock); |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
2c8c1e72 | 501 | void __net_exit br_net_exit(struct net *net) |
1da177e4 | 502 | { |
ab1b2046 | 503 | struct net_device *dev; |
8c56ba05 | 504 | LIST_HEAD(list); |
1da177e4 LT |
505 | |
506 | rtnl_lock(); | |
8c56ba05 ED |
507 | for_each_netdev(net, dev) |
508 | if (dev->priv_flags & IFF_EBRIDGE) | |
509 | del_br(netdev_priv(dev), &list); | |
510 | ||
511 | unregister_netdevice_many(&list); | |
1da177e4 LT |
512 | rtnl_unlock(); |
513 | ||
514 | } |