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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> | |
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 | 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 | 256 | p->port_no = index; |
3982d3d2 | 257 | p->flags = 0; |
1da177e4 LT |
258 | br_init_port(p); |
259 | p->state = BR_STATE_DISABLED; | |
d32439c0 | 260 | br_stp_port_timer_init(p); |
1da177e4 LT |
261 | |
262 | return p; | |
263 | } | |
264 | ||
384912ed MH |
265 | static struct device_type br_type = { |
266 | .name = "bridge", | |
267 | }; | |
268 | ||
4aa678ba | 269 | int br_add_bridge(struct net *net, const char *name) |
1da177e4 LT |
270 | { |
271 | struct net_device *dev; | |
272 | int ret; | |
273 | ||
4aa678ba | 274 | dev = new_bridge_dev(net, name); |
9d6f229f | 275 | if (!dev) |
1da177e4 LT |
276 | return -ENOMEM; |
277 | ||
278 | rtnl_lock(); | |
279 | if (strchr(dev->name, '%')) { | |
280 | ret = dev_alloc_name(dev, dev->name); | |
e340a90e PE |
281 | if (ret < 0) |
282 | goto out_free; | |
1da177e4 LT |
283 | } |
284 | ||
384912ed MH |
285 | SET_NETDEV_DEVTYPE(dev, &br_type); |
286 | ||
1da177e4 | 287 | ret = register_netdevice(dev); |
e340a90e PE |
288 | if (ret) |
289 | goto out_free; | |
1da177e4 | 290 | |
1da177e4 | 291 | ret = br_sysfs_addbr(dev); |
ac05202e | 292 | if (ret) |
36485707 JB |
293 | unregister_netdevice(dev); |
294 | out: | |
1da177e4 | 295 | rtnl_unlock(); |
ac05202e | 296 | return ret; |
e340a90e PE |
297 | |
298 | out_free: | |
299 | free_netdev(dev); | |
300 | goto out; | |
1da177e4 LT |
301 | } |
302 | ||
4aa678ba | 303 | int br_del_bridge(struct net *net, const char *name) |
1da177e4 LT |
304 | { |
305 | struct net_device *dev; | |
306 | int ret = 0; | |
307 | ||
308 | rtnl_lock(); | |
4aa678ba | 309 | dev = __dev_get_by_name(net, name); |
9d6f229f | 310 | if (dev == NULL) |
1da177e4 LT |
311 | ret = -ENXIO; /* Could not find device */ |
312 | ||
313 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
314 | /* Attempt to delete non bridge device! */ | |
315 | ret = -EPERM; | |
316 | } | |
317 | ||
318 | else if (dev->flags & IFF_UP) { | |
319 | /* Not shutdown yet. */ | |
320 | ret = -EBUSY; | |
9d6f229f | 321 | } |
1da177e4 | 322 | |
9d6f229f | 323 | else |
8c56ba05 | 324 | del_br(netdev_priv(dev), NULL); |
1da177e4 LT |
325 | |
326 | rtnl_unlock(); | |
327 | return ret; | |
328 | } | |
329 | ||
46f25dff | 330 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
1da177e4 LT |
331 | int br_min_mtu(const struct net_bridge *br) |
332 | { | |
333 | const struct net_bridge_port *p; | |
334 | int mtu = 0; | |
335 | ||
336 | ASSERT_RTNL(); | |
337 | ||
338 | if (list_empty(&br->port_list)) | |
46f25dff | 339 | mtu = ETH_DATA_LEN; |
1da177e4 LT |
340 | else { |
341 | list_for_each_entry(p, &br->port_list, list) { | |
342 | if (!mtu || p->dev->mtu < mtu) | |
343 | mtu = p->dev->mtu; | |
344 | } | |
345 | } | |
346 | return mtu; | |
347 | } | |
348 | ||
81d35307 SH |
349 | /* |
350 | * Recomputes features using slave's features | |
351 | */ | |
352 | void br_features_recompute(struct net_bridge *br) | |
353 | { | |
354 | struct net_bridge_port *p; | |
b63365a2 | 355 | unsigned long features, mask; |
81d35307 | 356 | |
b63365a2 HX |
357 | features = mask = br->feature_mask; |
358 | if (list_empty(&br->port_list)) | |
359 | goto done; | |
360 | ||
361 | features &= ~NETIF_F_ONE_FOR_ALL; | |
81d35307 SH |
362 | |
363 | list_for_each_entry(p, &br->port_list, list) { | |
b63365a2 HX |
364 | features = netdev_increment_features(features, |
365 | p->dev->features, mask); | |
81d35307 SH |
366 | } |
367 | ||
b63365a2 HX |
368 | done: |
369 | br->dev->features = netdev_fix_features(features, NULL); | |
81d35307 SH |
370 | } |
371 | ||
1da177e4 LT |
372 | /* called with RTNL */ |
373 | int br_add_if(struct net_bridge *br, struct net_device *dev) | |
374 | { | |
375 | struct net_bridge_port *p; | |
376 | int err = 0; | |
377 | ||
1056bd51 SH |
378 | /* Don't allow bridging non-ethernet like devices */ |
379 | if ((dev->flags & IFF_LOOPBACK) || | |
380 | dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN) | |
1da177e4 LT |
381 | return -EINVAL; |
382 | ||
1056bd51 | 383 | /* No bridging of bridges */ |
00829823 | 384 | if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit) |
1da177e4 LT |
385 | return -ELOOP; |
386 | ||
1056bd51 | 387 | /* Device is already being bridged */ |
1da177e4 LT |
388 | if (dev->br_port != NULL) |
389 | return -EBUSY; | |
390 | ||
ad4bb6f8 JB |
391 | /* No bridging devices that dislike that (e.g. wireless) */ |
392 | if (dev->priv_flags & IFF_DONT_BRIDGE) | |
393 | return -EOPNOTSUPP; | |
394 | ||
bab1deea SH |
395 | p = new_nbp(br, dev); |
396 | if (IS_ERR(p)) | |
1da177e4 LT |
397 | return PTR_ERR(p); |
398 | ||
bc3f9076 WC |
399 | err = dev_set_promiscuity(dev, 1); |
400 | if (err) | |
401 | goto put_back; | |
402 | ||
e32cc736 GKH |
403 | err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), |
404 | SYSFS_BRIDGE_PORT_ATTR); | |
bab1deea SH |
405 | if (err) |
406 | goto err0; | |
1da177e4 | 407 | |
9d6f229f | 408 | err = br_fdb_insert(br, p, dev->dev_addr); |
bab1deea SH |
409 | if (err) |
410 | goto err1; | |
1da177e4 | 411 | |
bab1deea SH |
412 | err = br_sysfs_addif(p); |
413 | if (err) | |
414 | goto err2; | |
1da177e4 | 415 | |
bab1deea | 416 | rcu_assign_pointer(dev->br_port, p); |
0187bdfb | 417 | dev_disable_lro(dev); |
bab1deea SH |
418 | |
419 | list_add_rcu(&p->list, &br->port_list); | |
420 | ||
421 | spin_lock_bh(&br->lock); | |
422 | br_stp_recalculate_bridge_id(br); | |
423 | br_features_recompute(br); | |
de79059e AS |
424 | |
425 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) && | |
426 | (br->dev->flags & IFF_UP)) | |
427 | br_stp_enable_port(p); | |
bab1deea SH |
428 | spin_unlock_bh(&br->lock); |
429 | ||
b86c4503 SH |
430 | br_ifinfo_notify(RTM_NEWLINK, p); |
431 | ||
bab1deea | 432 | dev_set_mtu(br->dev, br_min_mtu(br)); |
269def7c | 433 | |
bab1deea | 434 | kobject_uevent(&p->kobj, KOBJ_ADD); |
1da177e4 | 435 | |
bab1deea SH |
436 | return 0; |
437 | err2: | |
1a620698 | 438 | br_fdb_delete_by_port(br, p, 1); |
bab1deea | 439 | err1: |
c587aea9 | 440 | kobject_put(&p->kobj); |
30df94f8 | 441 | p = NULL; /* kobject_put frees */ |
bab1deea | 442 | err0: |
bc3f9076 | 443 | dev_set_promiscuity(dev, -1); |
43af8532 VL |
444 | put_back: |
445 | dev_put(dev); | |
bc3f9076 | 446 | kfree(p); |
1da177e4 LT |
447 | return err; |
448 | } | |
449 | ||
450 | /* called with RTNL */ | |
451 | int br_del_if(struct net_bridge *br, struct net_device *dev) | |
452 | { | |
453 | struct net_bridge_port *p = dev->br_port; | |
9d6f229f YH |
454 | |
455 | if (!p || p->br != br) | |
1da177e4 LT |
456 | return -EINVAL; |
457 | ||
1da177e4 LT |
458 | del_nbp(p); |
459 | ||
460 | spin_lock_bh(&br->lock); | |
461 | br_stp_recalculate_bridge_id(br); | |
81d35307 | 462 | br_features_recompute(br); |
1da177e4 LT |
463 | spin_unlock_bh(&br->lock); |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
2c8c1e72 | 468 | void __net_exit br_net_exit(struct net *net) |
1da177e4 | 469 | { |
ab1b2046 | 470 | struct net_device *dev; |
8c56ba05 | 471 | LIST_HEAD(list); |
1da177e4 LT |
472 | |
473 | rtnl_lock(); | |
8c56ba05 ED |
474 | for_each_netdev(net, dev) |
475 | if (dev->priv_flags & IFF_EBRIDGE) | |
476 | del_br(netdev_priv(dev), &list); | |
477 | ||
478 | unregister_netdevice_many(&list); | |
1da177e4 LT |
479 | rtnl_unlock(); |
480 | ||
481 | } |