Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Userspace interface | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * | |
8 | * $Id: br_if.c,v 1.7 2001/12/24 00:59:55 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/netdevice.h> | |
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> |
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 SH |
63 | |
64 | /* | |
65 | * Check for port carrier transistions. | |
66 | * Called from work queue to allow for calling functions that | |
67 | * might sleep (such as speed check), and to debounce. | |
68 | */ | |
269def7c | 69 | void br_port_carrier_check(struct net_bridge_port *p) |
4433f420 | 70 | { |
269def7c SH |
71 | struct net_device *dev = p->dev; |
72 | struct net_bridge *br = p->br; | |
6e86b890 SH |
73 | |
74 | if (netif_carrier_ok(dev)) | |
75 | p->path_cost = port_cost(dev); | |
76 | ||
269def7c | 77 | if (netif_running(br->dev)) { |
6e86b890 SH |
78 | spin_lock_bh(&br->lock); |
79 | if (netif_carrier_ok(dev)) { | |
80 | if (p->state == BR_STATE_DISABLED) | |
81 | br_stp_enable_port(p); | |
82 | } else { | |
83 | if (p->state != BR_STATE_DISABLED) | |
84 | br_stp_disable_port(p); | |
4433f420 | 85 | } |
6e86b890 | 86 | spin_unlock_bh(&br->lock); |
4433f420 | 87 | } |
4433f420 SH |
88 | } |
89 | ||
bab1deea SH |
90 | static void release_nbp(struct kobject *kobj) |
91 | { | |
92 | struct net_bridge_port *p | |
93 | = container_of(kobj, struct net_bridge_port, kobj); | |
94 | kfree(p); | |
95 | } | |
96 | ||
97 | static struct kobj_type brport_ktype = { | |
98 | #ifdef CONFIG_SYSFS | |
99 | .sysfs_ops = &brport_sysfs_ops, | |
100 | #endif | |
101 | .release = release_nbp, | |
102 | }; | |
103 | ||
1da177e4 LT |
104 | static void destroy_nbp(struct net_bridge_port *p) |
105 | { | |
106 | struct net_device *dev = p->dev; | |
107 | ||
1da177e4 LT |
108 | p->br = NULL; |
109 | p->dev = NULL; | |
110 | dev_put(dev); | |
111 | ||
bab1deea | 112 | kobject_put(&p->kobj); |
1da177e4 LT |
113 | } |
114 | ||
115 | static void destroy_nbp_rcu(struct rcu_head *head) | |
116 | { | |
117 | struct net_bridge_port *p = | |
118 | container_of(head, struct net_bridge_port, rcu); | |
119 | destroy_nbp(p); | |
120 | } | |
121 | ||
3f4cfc2d SH |
122 | /* Delete port(interface) from bridge is done in two steps. |
123 | * via RCU. First step, marks device as down. That deletes | |
124 | * all the timers and stops new packets from flowing through. | |
125 | * | |
126 | * Final cleanup doesn't occur until after all CPU's finished | |
127 | * processing packets. | |
128 | * | |
129 | * Protected from multiple admin operations by RTNL mutex | |
130 | */ | |
1da177e4 LT |
131 | static void del_nbp(struct net_bridge_port *p) |
132 | { | |
133 | struct net_bridge *br = p->br; | |
134 | struct net_device *dev = p->dev; | |
135 | ||
43b98c4a | 136 | sysfs_remove_link(br->ifobj, dev->name); |
bab1deea | 137 | |
1da177e4 LT |
138 | dev_set_promiscuity(dev, -1); |
139 | ||
140 | spin_lock_bh(&br->lock); | |
141 | br_stp_disable_port(p); | |
142 | spin_unlock_bh(&br->lock); | |
143 | ||
b86c4503 SH |
144 | br_ifinfo_notify(RTM_DELLINK, p); |
145 | ||
1a620698 | 146 | br_fdb_delete_by_port(br, p, 1); |
1da177e4 LT |
147 | |
148 | list_del_rcu(&p->list); | |
149 | ||
b3f1be4b SH |
150 | rcu_assign_pointer(dev->br_port, NULL); |
151 | ||
125a12cc | 152 | kobject_uevent(&p->kobj, KOBJ_REMOVE); |
bab1deea SH |
153 | kobject_del(&p->kobj); |
154 | ||
1da177e4 LT |
155 | call_rcu(&p->rcu, destroy_nbp_rcu); |
156 | } | |
157 | ||
158 | /* called with RTNL */ | |
159 | static void del_br(struct net_bridge *br) | |
160 | { | |
161 | struct net_bridge_port *p, *n; | |
162 | ||
163 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
1da177e4 LT |
164 | del_nbp(p); |
165 | } | |
166 | ||
167 | del_timer_sync(&br->gc_timer); | |
168 | ||
169 | br_sysfs_delbr(br->dev); | |
9d6f229f | 170 | unregister_netdevice(br->dev); |
1da177e4 LT |
171 | } |
172 | ||
173 | static struct net_device *new_bridge_dev(const char *name) | |
174 | { | |
175 | struct net_bridge *br; | |
176 | struct net_device *dev; | |
177 | ||
178 | dev = alloc_netdev(sizeof(struct net_bridge), name, | |
179 | br_dev_setup); | |
9d6f229f | 180 | |
1da177e4 LT |
181 | if (!dev) |
182 | return NULL; | |
183 | ||
184 | br = netdev_priv(dev); | |
185 | br->dev = dev; | |
186 | ||
187 | spin_lock_init(&br->lock); | |
188 | INIT_LIST_HEAD(&br->port_list); | |
189 | spin_lock_init(&br->hash_lock); | |
190 | ||
191 | br->bridge_id.prio[0] = 0x80; | |
192 | br->bridge_id.prio[1] = 0x00; | |
cee48541 SH |
193 | |
194 | memcpy(br->group_addr, br_group_address, ETH_ALEN); | |
1da177e4 | 195 | |
edb5e46f | 196 | br->feature_mask = dev->features; |
9cde0708 | 197 | br->stp_enabled = BR_NO_STP; |
1da177e4 LT |
198 | br->designated_root = br->bridge_id; |
199 | br->root_path_cost = 0; | |
200 | br->root_port = 0; | |
201 | br->bridge_max_age = br->max_age = 20 * HZ; | |
202 | br->bridge_hello_time = br->hello_time = 2 * HZ; | |
203 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; | |
204 | br->topology_change = 0; | |
205 | br->topology_change_detected = 0; | |
206 | br->ageing_time = 300 * HZ; | |
207 | INIT_LIST_HEAD(&br->age_list); | |
208 | ||
209 | br_stp_timer_init(br); | |
210 | ||
211 | return dev; | |
212 | } | |
213 | ||
214 | /* find an available port number */ | |
215 | static int find_portno(struct net_bridge *br) | |
216 | { | |
217 | int index; | |
218 | struct net_bridge_port *p; | |
219 | unsigned long *inuse; | |
220 | ||
3b781fa1 | 221 | inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long), |
1da177e4 LT |
222 | GFP_KERNEL); |
223 | if (!inuse) | |
224 | return -ENOMEM; | |
225 | ||
1da177e4 LT |
226 | set_bit(0, inuse); /* zero is reserved */ |
227 | list_for_each_entry(p, &br->port_list, list) { | |
228 | set_bit(p->port_no, inuse); | |
229 | } | |
230 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); | |
231 | kfree(inuse); | |
232 | ||
233 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; | |
234 | } | |
235 | ||
4433f420 | 236 | /* called with RTNL but without bridge lock */ |
9d6f229f | 237 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
4433f420 | 238 | struct net_device *dev) |
1da177e4 LT |
239 | { |
240 | int index; | |
241 | struct net_bridge_port *p; | |
9d6f229f | 242 | |
1da177e4 LT |
243 | index = find_portno(br); |
244 | if (index < 0) | |
245 | return ERR_PTR(index); | |
246 | ||
cee48541 | 247 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 LT |
248 | if (p == NULL) |
249 | return ERR_PTR(-ENOMEM); | |
250 | ||
1da177e4 LT |
251 | p->br = br; |
252 | dev_hold(dev); | |
253 | p->dev = dev; | |
4433f420 | 254 | p->path_cost = port_cost(dev); |
9d6f229f | 255 | p->priority = 0x8000 >> BR_PORT_BITS; |
1da177e4 LT |
256 | p->port_no = index; |
257 | br_init_port(p); | |
258 | p->state = BR_STATE_DISABLED; | |
d32439c0 | 259 | br_stp_port_timer_init(p); |
1da177e4 LT |
260 | |
261 | return p; | |
262 | } | |
263 | ||
264 | int br_add_bridge(const char *name) | |
265 | { | |
266 | struct net_device *dev; | |
267 | int ret; | |
268 | ||
269 | dev = new_bridge_dev(name); | |
9d6f229f | 270 | if (!dev) |
1da177e4 LT |
271 | return -ENOMEM; |
272 | ||
273 | rtnl_lock(); | |
274 | if (strchr(dev->name, '%')) { | |
275 | ret = dev_alloc_name(dev, dev->name); | |
e340a90e PE |
276 | if (ret < 0) |
277 | goto out_free; | |
1da177e4 LT |
278 | } |
279 | ||
280 | ret = register_netdevice(dev); | |
e340a90e PE |
281 | if (ret) |
282 | goto out_free; | |
1da177e4 | 283 | |
1da177e4 | 284 | ret = br_sysfs_addbr(dev); |
ac05202e | 285 | if (ret) |
36485707 JB |
286 | unregister_netdevice(dev); |
287 | out: | |
1da177e4 | 288 | rtnl_unlock(); |
ac05202e | 289 | return ret; |
e340a90e PE |
290 | |
291 | out_free: | |
292 | free_netdev(dev); | |
293 | goto out; | |
1da177e4 LT |
294 | } |
295 | ||
296 | int br_del_bridge(const char *name) | |
297 | { | |
298 | struct net_device *dev; | |
299 | int ret = 0; | |
300 | ||
301 | rtnl_lock(); | |
881d966b | 302 | dev = __dev_get_by_name(&init_net, name); |
9d6f229f | 303 | if (dev == NULL) |
1da177e4 LT |
304 | ret = -ENXIO; /* Could not find device */ |
305 | ||
306 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
307 | /* Attempt to delete non bridge device! */ | |
308 | ret = -EPERM; | |
309 | } | |
310 | ||
311 | else if (dev->flags & IFF_UP) { | |
312 | /* Not shutdown yet. */ | |
313 | ret = -EBUSY; | |
9d6f229f | 314 | } |
1da177e4 | 315 | |
9d6f229f | 316 | else |
1da177e4 LT |
317 | del_br(netdev_priv(dev)); |
318 | ||
319 | rtnl_unlock(); | |
320 | return ret; | |
321 | } | |
322 | ||
46f25dff | 323 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
1da177e4 LT |
324 | int br_min_mtu(const struct net_bridge *br) |
325 | { | |
326 | const struct net_bridge_port *p; | |
327 | int mtu = 0; | |
328 | ||
329 | ASSERT_RTNL(); | |
330 | ||
331 | if (list_empty(&br->port_list)) | |
46f25dff | 332 | mtu = ETH_DATA_LEN; |
1da177e4 LT |
333 | else { |
334 | list_for_each_entry(p, &br->port_list, list) { | |
335 | if (!mtu || p->dev->mtu < mtu) | |
336 | mtu = p->dev->mtu; | |
337 | } | |
338 | } | |
339 | return mtu; | |
340 | } | |
341 | ||
81d35307 SH |
342 | /* |
343 | * Recomputes features using slave's features | |
344 | */ | |
345 | void br_features_recompute(struct net_bridge *br) | |
346 | { | |
347 | struct net_bridge_port *p; | |
7f353bf2 | 348 | unsigned long features; |
81d35307 | 349 | |
7f353bf2 | 350 | features = br->feature_mask; |
81d35307 SH |
351 | |
352 | list_for_each_entry(p, &br->port_list, list) { | |
7f353bf2 | 353 | features = netdev_compute_features(features, p->dev->features); |
81d35307 SH |
354 | } |
355 | ||
7f353bf2 | 356 | br->dev->features = features; |
81d35307 SH |
357 | } |
358 | ||
1da177e4 LT |
359 | /* called with RTNL */ |
360 | int br_add_if(struct net_bridge *br, struct net_device *dev) | |
361 | { | |
362 | struct net_bridge_port *p; | |
363 | int err = 0; | |
364 | ||
365 | if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER) | |
366 | return -EINVAL; | |
367 | ||
368 | if (dev->hard_start_xmit == br_dev_xmit) | |
369 | return -ELOOP; | |
370 | ||
371 | if (dev->br_port != NULL) | |
372 | return -EBUSY; | |
373 | ||
bab1deea SH |
374 | p = new_nbp(br, dev); |
375 | if (IS_ERR(p)) | |
1da177e4 LT |
376 | return PTR_ERR(p); |
377 | ||
e32cc736 GKH |
378 | err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), |
379 | SYSFS_BRIDGE_PORT_ATTR); | |
bab1deea SH |
380 | if (err) |
381 | goto err0; | |
1da177e4 | 382 | |
9d6f229f | 383 | err = br_fdb_insert(br, p, dev->dev_addr); |
bab1deea SH |
384 | if (err) |
385 | goto err1; | |
1da177e4 | 386 | |
bab1deea SH |
387 | err = br_sysfs_addif(p); |
388 | if (err) | |
389 | goto err2; | |
1da177e4 | 390 | |
bab1deea SH |
391 | rcu_assign_pointer(dev->br_port, p); |
392 | dev_set_promiscuity(dev, 1); | |
393 | ||
394 | list_add_rcu(&p->list, &br->port_list); | |
395 | ||
396 | spin_lock_bh(&br->lock); | |
397 | br_stp_recalculate_bridge_id(br); | |
398 | br_features_recompute(br); | |
de79059e AS |
399 | |
400 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) && | |
401 | (br->dev->flags & IFF_UP)) | |
402 | br_stp_enable_port(p); | |
bab1deea SH |
403 | spin_unlock_bh(&br->lock); |
404 | ||
b86c4503 SH |
405 | br_ifinfo_notify(RTM_NEWLINK, p); |
406 | ||
bab1deea | 407 | dev_set_mtu(br->dev, br_min_mtu(br)); |
269def7c | 408 | |
bab1deea | 409 | kobject_uevent(&p->kobj, KOBJ_ADD); |
1da177e4 | 410 | |
bab1deea SH |
411 | return 0; |
412 | err2: | |
1a620698 | 413 | br_fdb_delete_by_port(br, p, 1); |
bab1deea SH |
414 | err1: |
415 | kobject_del(&p->kobj); | |
43af8532 | 416 | goto put_back; |
bab1deea SH |
417 | err0: |
418 | kobject_put(&p->kobj); | |
43af8532 VL |
419 | |
420 | put_back: | |
421 | dev_put(dev); | |
1da177e4 LT |
422 | return err; |
423 | } | |
424 | ||
425 | /* called with RTNL */ | |
426 | int br_del_if(struct net_bridge *br, struct net_device *dev) | |
427 | { | |
428 | struct net_bridge_port *p = dev->br_port; | |
9d6f229f YH |
429 | |
430 | if (!p || p->br != br) | |
1da177e4 LT |
431 | return -EINVAL; |
432 | ||
1da177e4 LT |
433 | del_nbp(p); |
434 | ||
435 | spin_lock_bh(&br->lock); | |
436 | br_stp_recalculate_bridge_id(br); | |
81d35307 | 437 | br_features_recompute(br); |
1da177e4 LT |
438 | spin_unlock_bh(&br->lock); |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
443 | void __exit br_cleanup_bridges(void) | |
444 | { | |
445 | struct net_device *dev, *nxt; | |
446 | ||
447 | rtnl_lock(); | |
881d966b | 448 | for_each_netdev_safe(&init_net, dev, nxt) |
1da177e4 LT |
449 | if (dev->priv_flags & IFF_EBRIDGE) |
450 | del_br(dev->priv); | |
1da177e4 LT |
451 | rtnl_unlock(); |
452 | ||
453 | } |