Commit | Line | Data |
---|---|---|
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> | |
16 | #include <linux/ethtool.h> | |
17 | #include <linux/if_arp.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/rtnetlink.h> | |
46f25dff | 21 | #include <linux/if_ether.h> |
1da177e4 LT |
22 | #include <net/sock.h> |
23 | ||
24 | #include "br_private.h" | |
25 | ||
26 | /* | |
27 | * Determine initial path cost based on speed. | |
28 | * using recommendations from 802.1d standard | |
29 | * | |
61a44b9c | 30 | * Since driver might sleep need to not be holding any locks. |
1da177e4 | 31 | */ |
4433f420 | 32 | static int port_cost(struct net_device *dev) |
1da177e4 | 33 | { |
b4a488d1 SH |
34 | if (dev->ethtool_ops && dev->ethtool_ops->get_settings) { |
35 | struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET, }; | |
36 | ||
37 | if (!dev->ethtool_ops->get_settings(dev, &ecmd)) { | |
61a44b9c | 38 | switch(ecmd.speed) { |
61a44b9c MW |
39 | case SPEED_10000: |
40 | return 2; | |
b4a488d1 SH |
41 | case SPEED_1000: |
42 | return 4; | |
43 | case SPEED_100: | |
44 | return 19; | |
61a44b9c MW |
45 | case SPEED_10: |
46 | return 100; | |
47 | } | |
1da177e4 LT |
48 | } |
49 | } | |
50 | ||
51 | /* Old silly heuristics based on name */ | |
52 | if (!strncmp(dev->name, "lec", 3)) | |
53 | return 7; | |
54 | ||
55 | if (!strncmp(dev->name, "plip", 4)) | |
56 | return 2500; | |
57 | ||
58 | return 100; /* assume old 10Mbps */ | |
59 | } | |
60 | ||
4433f420 SH |
61 | |
62 | /* | |
63 | * Check for port carrier transistions. | |
64 | * Called from work queue to allow for calling functions that | |
65 | * might sleep (such as speed check), and to debounce. | |
66 | */ | |
269def7c | 67 | void br_port_carrier_check(struct net_bridge_port *p) |
4433f420 | 68 | { |
269def7c SH |
69 | struct net_device *dev = p->dev; |
70 | struct net_bridge *br = p->br; | |
6e86b890 SH |
71 | |
72 | if (netif_carrier_ok(dev)) | |
73 | p->path_cost = port_cost(dev); | |
74 | ||
269def7c | 75 | if (netif_running(br->dev)) { |
6e86b890 SH |
76 | spin_lock_bh(&br->lock); |
77 | if (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 | } |
6e86b890 | 84 | spin_unlock_bh(&br->lock); |
4433f420 | 85 | } |
4433f420 SH |
86 | } |
87 | ||
bab1deea SH |
88 | static void release_nbp(struct kobject *kobj) |
89 | { | |
90 | struct net_bridge_port *p | |
91 | = container_of(kobj, struct net_bridge_port, kobj); | |
92 | kfree(p); | |
93 | } | |
94 | ||
95 | static struct kobj_type brport_ktype = { | |
96 | #ifdef CONFIG_SYSFS | |
97 | .sysfs_ops = &brport_sysfs_ops, | |
98 | #endif | |
99 | .release = release_nbp, | |
100 | }; | |
101 | ||
1da177e4 LT |
102 | static void destroy_nbp(struct net_bridge_port *p) |
103 | { | |
104 | struct net_device *dev = p->dev; | |
105 | ||
1da177e4 LT |
106 | p->br = NULL; |
107 | p->dev = NULL; | |
108 | dev_put(dev); | |
109 | ||
bab1deea | 110 | kobject_put(&p->kobj); |
1da177e4 LT |
111 | } |
112 | ||
113 | static void destroy_nbp_rcu(struct rcu_head *head) | |
114 | { | |
115 | struct net_bridge_port *p = | |
116 | container_of(head, struct net_bridge_port, rcu); | |
117 | destroy_nbp(p); | |
118 | } | |
119 | ||
3f4cfc2d SH |
120 | /* Delete port(interface) from bridge is done in two steps. |
121 | * via RCU. First step, marks device as down. That deletes | |
122 | * all the timers and stops new packets from flowing through. | |
123 | * | |
124 | * Final cleanup doesn't occur until after all CPU's finished | |
125 | * processing packets. | |
126 | * | |
127 | * Protected from multiple admin operations by RTNL mutex | |
128 | */ | |
1da177e4 LT |
129 | static void del_nbp(struct net_bridge_port *p) |
130 | { | |
131 | struct net_bridge *br = p->br; | |
132 | struct net_device *dev = p->dev; | |
133 | ||
43b98c4a | 134 | sysfs_remove_link(br->ifobj, dev->name); |
bab1deea | 135 | |
1da177e4 LT |
136 | dev_set_promiscuity(dev, -1); |
137 | ||
138 | spin_lock_bh(&br->lock); | |
139 | br_stp_disable_port(p); | |
140 | spin_unlock_bh(&br->lock); | |
141 | ||
b86c4503 SH |
142 | br_ifinfo_notify(RTM_DELLINK, p); |
143 | ||
1a620698 | 144 | br_fdb_delete_by_port(br, p, 1); |
1da177e4 LT |
145 | |
146 | list_del_rcu(&p->list); | |
147 | ||
b3f1be4b SH |
148 | rcu_assign_pointer(dev->br_port, NULL); |
149 | ||
125a12cc | 150 | kobject_uevent(&p->kobj, KOBJ_REMOVE); |
bab1deea SH |
151 | kobject_del(&p->kobj); |
152 | ||
1da177e4 LT |
153 | call_rcu(&p->rcu, destroy_nbp_rcu); |
154 | } | |
155 | ||
156 | /* called with RTNL */ | |
8c56ba05 | 157 | static void del_br(struct net_bridge *br, struct list_head *head) |
1da177e4 LT |
158 | { |
159 | struct net_bridge_port *p, *n; | |
160 | ||
161 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
1da177e4 LT |
162 | del_nbp(p); |
163 | } | |
164 | ||
165 | del_timer_sync(&br->gc_timer); | |
166 | ||
167 | br_sysfs_delbr(br->dev); | |
8c56ba05 | 168 | unregister_netdevice_queue(br->dev, head); |
1da177e4 LT |
169 | } |
170 | ||
4aa678ba | 171 | static struct net_device *new_bridge_dev(struct net *net, const char *name) |
1da177e4 LT |
172 | { |
173 | struct net_bridge *br; | |
174 | struct net_device *dev; | |
175 | ||
176 | dev = alloc_netdev(sizeof(struct net_bridge), name, | |
177 | br_dev_setup); | |
9d6f229f | 178 | |
1da177e4 LT |
179 | if (!dev) |
180 | return NULL; | |
4aa678ba | 181 | dev_net_set(dev, net); |
1da177e4 LT |
182 | |
183 | br = netdev_priv(dev); | |
184 | br->dev = dev; | |
185 | ||
186 | spin_lock_init(&br->lock); | |
187 | INIT_LIST_HEAD(&br->port_list); | |
188 | spin_lock_init(&br->hash_lock); | |
189 | ||
190 | br->bridge_id.prio[0] = 0x80; | |
191 | br->bridge_id.prio[1] = 0x00; | |
cee48541 SH |
192 | |
193 | memcpy(br->group_addr, br_group_address, ETH_ALEN); | |
1da177e4 | 194 | |
edb5e46f | 195 | br->feature_mask = dev->features; |
9cde0708 | 196 | br->stp_enabled = BR_NO_STP; |
1da177e4 LT |
197 | br->designated_root = br->bridge_id; |
198 | br->root_path_cost = 0; | |
199 | br->root_port = 0; | |
200 | br->bridge_max_age = br->max_age = 20 * HZ; | |
201 | br->bridge_hello_time = br->hello_time = 2 * HZ; | |
202 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; | |
203 | br->topology_change = 0; | |
204 | br->topology_change_detected = 0; | |
205 | br->ageing_time = 300 * HZ; | |
4adf0af6 SW |
206 | |
207 | br_netfilter_rtable_init(br); | |
208 | ||
1da177e4 LT |
209 | INIT_LIST_HEAD(&br->age_list); |
210 | ||
211 | br_stp_timer_init(br); | |
212 | ||
213 | return dev; | |
214 | } | |
215 | ||
216 | /* find an available port number */ | |
217 | static int find_portno(struct net_bridge *br) | |
218 | { | |
219 | int index; | |
220 | struct net_bridge_port *p; | |
221 | unsigned long *inuse; | |
222 | ||
3b781fa1 | 223 | inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long), |
1da177e4 LT |
224 | GFP_KERNEL); |
225 | if (!inuse) | |
226 | return -ENOMEM; | |
227 | ||
1da177e4 LT |
228 | set_bit(0, inuse); /* zero is reserved */ |
229 | list_for_each_entry(p, &br->port_list, list) { | |
230 | set_bit(p->port_no, inuse); | |
231 | } | |
232 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); | |
233 | kfree(inuse); | |
234 | ||
235 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; | |
236 | } | |
237 | ||
4433f420 | 238 | /* called with RTNL but without bridge lock */ |
9d6f229f | 239 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
4433f420 | 240 | struct net_device *dev) |
1da177e4 LT |
241 | { |
242 | int index; | |
243 | struct net_bridge_port *p; | |
9d6f229f | 244 | |
1da177e4 LT |
245 | index = find_portno(br); |
246 | if (index < 0) | |
247 | return ERR_PTR(index); | |
248 | ||
cee48541 | 249 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 LT |
250 | if (p == NULL) |
251 | return ERR_PTR(-ENOMEM); | |
252 | ||
1da177e4 LT |
253 | p->br = br; |
254 | dev_hold(dev); | |
255 | p->dev = dev; | |
4433f420 | 256 | p->path_cost = port_cost(dev); |
9d6f229f | 257 | p->priority = 0x8000 >> BR_PORT_BITS; |
1da177e4 | 258 | p->port_no = index; |
3982d3d2 | 259 | p->flags = 0; |
1da177e4 LT |
260 | br_init_port(p); |
261 | p->state = BR_STATE_DISABLED; | |
d32439c0 | 262 | br_stp_port_timer_init(p); |
1da177e4 LT |
263 | |
264 | return p; | |
265 | } | |
266 | ||
384912ed MH |
267 | static struct device_type br_type = { |
268 | .name = "bridge", | |
269 | }; | |
270 | ||
4aa678ba | 271 | int br_add_bridge(struct net *net, const char *name) |
1da177e4 LT |
272 | { |
273 | struct net_device *dev; | |
274 | int ret; | |
275 | ||
4aa678ba | 276 | dev = new_bridge_dev(net, name); |
9d6f229f | 277 | if (!dev) |
1da177e4 LT |
278 | return -ENOMEM; |
279 | ||
280 | rtnl_lock(); | |
281 | if (strchr(dev->name, '%')) { | |
282 | ret = dev_alloc_name(dev, dev->name); | |
e340a90e PE |
283 | if (ret < 0) |
284 | goto out_free; | |
1da177e4 LT |
285 | } |
286 | ||
384912ed MH |
287 | SET_NETDEV_DEVTYPE(dev, &br_type); |
288 | ||
1da177e4 | 289 | ret = register_netdevice(dev); |
e340a90e PE |
290 | if (ret) |
291 | goto out_free; | |
1da177e4 | 292 | |
1da177e4 | 293 | ret = br_sysfs_addbr(dev); |
ac05202e | 294 | if (ret) |
36485707 JB |
295 | unregister_netdevice(dev); |
296 | out: | |
1da177e4 | 297 | rtnl_unlock(); |
ac05202e | 298 | return ret; |
e340a90e PE |
299 | |
300 | out_free: | |
301 | free_netdev(dev); | |
302 | goto out; | |
1da177e4 LT |
303 | } |
304 | ||
4aa678ba | 305 | int br_del_bridge(struct net *net, const char *name) |
1da177e4 LT |
306 | { |
307 | struct net_device *dev; | |
308 | int ret = 0; | |
309 | ||
310 | rtnl_lock(); | |
4aa678ba | 311 | dev = __dev_get_by_name(net, name); |
9d6f229f | 312 | if (dev == NULL) |
1da177e4 LT |
313 | ret = -ENXIO; /* Could not find device */ |
314 | ||
315 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
316 | /* Attempt to delete non bridge device! */ | |
317 | ret = -EPERM; | |
318 | } | |
319 | ||
320 | else if (dev->flags & IFF_UP) { | |
321 | /* Not shutdown yet. */ | |
322 | ret = -EBUSY; | |
9d6f229f | 323 | } |
1da177e4 | 324 | |
9d6f229f | 325 | else |
8c56ba05 | 326 | del_br(netdev_priv(dev), NULL); |
1da177e4 LT |
327 | |
328 | rtnl_unlock(); | |
329 | return ret; | |
330 | } | |
331 | ||
46f25dff | 332 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
1da177e4 LT |
333 | int br_min_mtu(const struct net_bridge *br) |
334 | { | |
335 | const struct net_bridge_port *p; | |
336 | int mtu = 0; | |
337 | ||
338 | ASSERT_RTNL(); | |
339 | ||
340 | if (list_empty(&br->port_list)) | |
46f25dff | 341 | mtu = ETH_DATA_LEN; |
1da177e4 LT |
342 | else { |
343 | list_for_each_entry(p, &br->port_list, list) { | |
344 | if (!mtu || p->dev->mtu < mtu) | |
345 | mtu = p->dev->mtu; | |
346 | } | |
347 | } | |
348 | return mtu; | |
349 | } | |
350 | ||
81d35307 SH |
351 | /* |
352 | * Recomputes features using slave's features | |
353 | */ | |
354 | void br_features_recompute(struct net_bridge *br) | |
355 | { | |
356 | struct net_bridge_port *p; | |
b63365a2 | 357 | unsigned long features, mask; |
81d35307 | 358 | |
b63365a2 HX |
359 | features = mask = br->feature_mask; |
360 | if (list_empty(&br->port_list)) | |
361 | goto done; | |
362 | ||
363 | features &= ~NETIF_F_ONE_FOR_ALL; | |
81d35307 SH |
364 | |
365 | list_for_each_entry(p, &br->port_list, list) { | |
b63365a2 HX |
366 | features = netdev_increment_features(features, |
367 | p->dev->features, mask); | |
81d35307 SH |
368 | } |
369 | ||
b63365a2 HX |
370 | done: |
371 | br->dev->features = netdev_fix_features(features, NULL); | |
81d35307 SH |
372 | } |
373 | ||
1da177e4 LT |
374 | /* called with RTNL */ |
375 | int br_add_if(struct net_bridge *br, struct net_device *dev) | |
376 | { | |
377 | struct net_bridge_port *p; | |
378 | int err = 0; | |
379 | ||
1056bd51 SH |
380 | /* Don't allow bridging non-ethernet like devices */ |
381 | if ((dev->flags & IFF_LOOPBACK) || | |
382 | dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN) | |
1da177e4 LT |
383 | return -EINVAL; |
384 | ||
1056bd51 | 385 | /* No bridging of bridges */ |
00829823 | 386 | if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit) |
1da177e4 LT |
387 | return -ELOOP; |
388 | ||
1056bd51 | 389 | /* Device is already being bridged */ |
1da177e4 LT |
390 | if (dev->br_port != NULL) |
391 | return -EBUSY; | |
392 | ||
ad4bb6f8 JB |
393 | /* No bridging devices that dislike that (e.g. wireless) */ |
394 | if (dev->priv_flags & IFF_DONT_BRIDGE) | |
395 | return -EOPNOTSUPP; | |
396 | ||
bab1deea SH |
397 | p = new_nbp(br, dev); |
398 | if (IS_ERR(p)) | |
1da177e4 LT |
399 | return PTR_ERR(p); |
400 | ||
bc3f9076 WC |
401 | err = dev_set_promiscuity(dev, 1); |
402 | if (err) | |
403 | goto put_back; | |
404 | ||
e32cc736 GKH |
405 | err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), |
406 | SYSFS_BRIDGE_PORT_ATTR); | |
bab1deea SH |
407 | if (err) |
408 | goto err0; | |
1da177e4 | 409 | |
9d6f229f | 410 | err = br_fdb_insert(br, p, dev->dev_addr); |
bab1deea SH |
411 | if (err) |
412 | goto err1; | |
1da177e4 | 413 | |
bab1deea SH |
414 | err = br_sysfs_addif(p); |
415 | if (err) | |
416 | goto err2; | |
1da177e4 | 417 | |
bab1deea | 418 | rcu_assign_pointer(dev->br_port, p); |
0187bdfb | 419 | dev_disable_lro(dev); |
bab1deea SH |
420 | |
421 | list_add_rcu(&p->list, &br->port_list); | |
422 | ||
423 | spin_lock_bh(&br->lock); | |
424 | br_stp_recalculate_bridge_id(br); | |
425 | br_features_recompute(br); | |
de79059e AS |
426 | |
427 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) && | |
428 | (br->dev->flags & IFF_UP)) | |
429 | br_stp_enable_port(p); | |
bab1deea SH |
430 | spin_unlock_bh(&br->lock); |
431 | ||
b86c4503 SH |
432 | br_ifinfo_notify(RTM_NEWLINK, p); |
433 | ||
bab1deea | 434 | dev_set_mtu(br->dev, br_min_mtu(br)); |
269def7c | 435 | |
bab1deea | 436 | kobject_uevent(&p->kobj, KOBJ_ADD); |
1da177e4 | 437 | |
bab1deea SH |
438 | return 0; |
439 | err2: | |
1a620698 | 440 | br_fdb_delete_by_port(br, p, 1); |
bab1deea | 441 | err1: |
c587aea9 | 442 | kobject_put(&p->kobj); |
30df94f8 | 443 | p = NULL; /* kobject_put frees */ |
bab1deea | 444 | err0: |
bc3f9076 | 445 | dev_set_promiscuity(dev, -1); |
43af8532 VL |
446 | put_back: |
447 | dev_put(dev); | |
bc3f9076 | 448 | kfree(p); |
1da177e4 LT |
449 | return err; |
450 | } | |
451 | ||
452 | /* called with RTNL */ | |
453 | int br_del_if(struct net_bridge *br, struct net_device *dev) | |
454 | { | |
455 | struct net_bridge_port *p = dev->br_port; | |
9d6f229f YH |
456 | |
457 | if (!p || p->br != br) | |
1da177e4 LT |
458 | return -EINVAL; |
459 | ||
1da177e4 LT |
460 | del_nbp(p); |
461 | ||
462 | spin_lock_bh(&br->lock); | |
463 | br_stp_recalculate_bridge_id(br); | |
81d35307 | 464 | br_features_recompute(br); |
1da177e4 LT |
465 | spin_unlock_bh(&br->lock); |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
2c8c1e72 | 470 | void __net_exit br_net_exit(struct net *net) |
1da177e4 | 471 | { |
ab1b2046 | 472 | struct net_device *dev; |
8c56ba05 | 473 | LIST_HEAD(list); |
1da177e4 LT |
474 | |
475 | rtnl_lock(); | |
8c56ba05 ED |
476 | for_each_netdev(net, dev) |
477 | if (dev->priv_flags & IFF_EBRIDGE) | |
478 | del_br(netdev_priv(dev), &list); | |
479 | ||
480 | unregister_netdevice_many(&list); | |
1da177e4 LT |
481 | rtnl_unlock(); |
482 | ||
483 | } |