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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> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
1da177e4 LT |
23 | #include <net/sock.h> |
24 | ||
25 | #include "br_private.h" | |
26 | ||
27 | /* | |
28 | * Determine initial path cost based on speed. | |
29 | * using recommendations from 802.1d standard | |
30 | * | |
61a44b9c | 31 | * Since driver might sleep need to not be holding any locks. |
1da177e4 | 32 | */ |
4433f420 | 33 | static int port_cost(struct net_device *dev) |
1da177e4 | 34 | { |
b4a488d1 SH |
35 | if (dev->ethtool_ops && dev->ethtool_ops->get_settings) { |
36 | struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET, }; | |
37 | ||
38 | if (!dev->ethtool_ops->get_settings(dev, &ecmd)) { | |
61a44b9c | 39 | switch(ecmd.speed) { |
61a44b9c MW |
40 | case SPEED_10000: |
41 | return 2; | |
b4a488d1 SH |
42 | case SPEED_1000: |
43 | return 4; | |
44 | case SPEED_100: | |
45 | return 19; | |
61a44b9c MW |
46 | case SPEED_10: |
47 | return 100; | |
48 | } | |
1da177e4 LT |
49 | } |
50 | } | |
51 | ||
52 | /* Old silly heuristics based on name */ | |
53 | if (!strncmp(dev->name, "lec", 3)) | |
54 | return 7; | |
55 | ||
56 | if (!strncmp(dev->name, "plip", 4)) | |
57 | return 2500; | |
58 | ||
59 | return 100; /* assume old 10Mbps */ | |
60 | } | |
61 | ||
4433f420 SH |
62 | |
63 | /* | |
64 | * Check for port carrier transistions. | |
65 | * Called from work queue to allow for calling functions that | |
66 | * might sleep (such as speed check), and to debounce. | |
67 | */ | |
269def7c | 68 | void br_port_carrier_check(struct net_bridge_port *p) |
4433f420 | 69 | { |
269def7c SH |
70 | struct net_device *dev = p->dev; |
71 | struct net_bridge *br = p->br; | |
6e86b890 SH |
72 | |
73 | if (netif_carrier_ok(dev)) | |
74 | p->path_cost = port_cost(dev); | |
75 | ||
269def7c | 76 | if (netif_running(br->dev)) { |
6e86b890 SH |
77 | spin_lock_bh(&br->lock); |
78 | if (netif_carrier_ok(dev)) { | |
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 | } |
6e86b890 | 85 | spin_unlock_bh(&br->lock); |
4433f420 | 86 | } |
4433f420 SH |
87 | } |
88 | ||
bab1deea SH |
89 | static void release_nbp(struct kobject *kobj) |
90 | { | |
91 | struct net_bridge_port *p | |
92 | = container_of(kobj, struct net_bridge_port, kobj); | |
93 | kfree(p); | |
94 | } | |
95 | ||
96 | static struct kobj_type brport_ktype = { | |
97 | #ifdef CONFIG_SYSFS | |
98 | .sysfs_ops = &brport_sysfs_ops, | |
99 | #endif | |
100 | .release = release_nbp, | |
101 | }; | |
102 | ||
1da177e4 LT |
103 | static void destroy_nbp(struct net_bridge_port *p) |
104 | { | |
105 | struct net_device *dev = p->dev; | |
106 | ||
1da177e4 LT |
107 | p->br = NULL; |
108 | p->dev = NULL; | |
109 | dev_put(dev); | |
110 | ||
bab1deea | 111 | kobject_put(&p->kobj); |
1da177e4 LT |
112 | } |
113 | ||
114 | static void destroy_nbp_rcu(struct rcu_head *head) | |
115 | { | |
116 | struct net_bridge_port *p = | |
117 | container_of(head, struct net_bridge_port, rcu); | |
118 | destroy_nbp(p); | |
119 | } | |
120 | ||
3f4cfc2d SH |
121 | /* Delete port(interface) from bridge is done in two steps. |
122 | * via RCU. First step, marks device as down. That deletes | |
123 | * all the timers and stops new packets from flowing through. | |
124 | * | |
125 | * Final cleanup doesn't occur until after all CPU's finished | |
126 | * processing packets. | |
127 | * | |
128 | * Protected from multiple admin operations by RTNL mutex | |
129 | */ | |
1da177e4 LT |
130 | static void del_nbp(struct net_bridge_port *p) |
131 | { | |
132 | struct net_bridge *br = p->br; | |
133 | struct net_device *dev = p->dev; | |
134 | ||
43b98c4a | 135 | sysfs_remove_link(br->ifobj, dev->name); |
bab1deea | 136 | |
1da177e4 LT |
137 | dev_set_promiscuity(dev, -1); |
138 | ||
139 | spin_lock_bh(&br->lock); | |
140 | br_stp_disable_port(p); | |
141 | spin_unlock_bh(&br->lock); | |
142 | ||
b86c4503 SH |
143 | br_ifinfo_notify(RTM_DELLINK, p); |
144 | ||
1a620698 | 145 | br_fdb_delete_by_port(br, p, 1); |
1da177e4 LT |
146 | |
147 | list_del_rcu(&p->list); | |
148 | ||
b3f1be4b SH |
149 | rcu_assign_pointer(dev->br_port, NULL); |
150 | ||
3fe2d7c7 HX |
151 | br_multicast_del_port(p); |
152 | ||
125a12cc | 153 | kobject_uevent(&p->kobj, KOBJ_REMOVE); |
bab1deea SH |
154 | kobject_del(&p->kobj); |
155 | ||
1da177e4 LT |
156 | call_rcu(&p->rcu, destroy_nbp_rcu); |
157 | } | |
158 | ||
159 | /* called with RTNL */ | |
8c56ba05 | 160 | static void del_br(struct net_bridge *br, struct list_head *head) |
1da177e4 LT |
161 | { |
162 | struct net_bridge_port *p, *n; | |
163 | ||
164 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
1da177e4 LT |
165 | del_nbp(p); |
166 | } | |
167 | ||
168 | del_timer_sync(&br->gc_timer); | |
169 | ||
170 | br_sysfs_delbr(br->dev); | |
8c56ba05 | 171 | unregister_netdevice_queue(br->dev, head); |
1da177e4 LT |
172 | } |
173 | ||
4aa678ba | 174 | static struct net_device *new_bridge_dev(struct net *net, const char *name) |
1da177e4 LT |
175 | { |
176 | struct net_bridge *br; | |
177 | struct net_device *dev; | |
178 | ||
179 | dev = alloc_netdev(sizeof(struct net_bridge), name, | |
180 | br_dev_setup); | |
9d6f229f | 181 | |
1da177e4 LT |
182 | if (!dev) |
183 | return NULL; | |
4aa678ba | 184 | dev_net_set(dev, net); |
1da177e4 LT |
185 | |
186 | br = netdev_priv(dev); | |
187 | br->dev = dev; | |
188 | ||
189 | spin_lock_init(&br->lock); | |
190 | INIT_LIST_HEAD(&br->port_list); | |
191 | spin_lock_init(&br->hash_lock); | |
192 | ||
193 | br->bridge_id.prio[0] = 0x80; | |
194 | br->bridge_id.prio[1] = 0x00; | |
cee48541 SH |
195 | |
196 | memcpy(br->group_addr, br_group_address, ETH_ALEN); | |
1da177e4 | 197 | |
edb5e46f | 198 | br->feature_mask = dev->features; |
9cde0708 | 199 | br->stp_enabled = BR_NO_STP; |
1da177e4 LT |
200 | br->designated_root = br->bridge_id; |
201 | br->root_path_cost = 0; | |
202 | br->root_port = 0; | |
203 | br->bridge_max_age = br->max_age = 20 * HZ; | |
204 | br->bridge_hello_time = br->hello_time = 2 * HZ; | |
205 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; | |
206 | br->topology_change = 0; | |
207 | br->topology_change_detected = 0; | |
208 | br->ageing_time = 300 * HZ; | |
4adf0af6 SW |
209 | |
210 | br_netfilter_rtable_init(br); | |
211 | ||
1da177e4 | 212 | br_stp_timer_init(br); |
3fe2d7c7 | 213 | br_multicast_init(br); |
1da177e4 LT |
214 | |
215 | return dev; | |
216 | } | |
217 | ||
218 | /* find an available port number */ | |
219 | static int find_portno(struct net_bridge *br) | |
220 | { | |
221 | int index; | |
222 | struct net_bridge_port *p; | |
223 | unsigned long *inuse; | |
224 | ||
3b781fa1 | 225 | inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long), |
1da177e4 LT |
226 | GFP_KERNEL); |
227 | if (!inuse) | |
228 | return -ENOMEM; | |
229 | ||
1da177e4 LT |
230 | set_bit(0, inuse); /* zero is reserved */ |
231 | list_for_each_entry(p, &br->port_list, list) { | |
232 | set_bit(p->port_no, inuse); | |
233 | } | |
234 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); | |
235 | kfree(inuse); | |
236 | ||
237 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; | |
238 | } | |
239 | ||
4433f420 | 240 | /* called with RTNL but without bridge lock */ |
9d6f229f | 241 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
4433f420 | 242 | struct net_device *dev) |
1da177e4 LT |
243 | { |
244 | int index; | |
245 | struct net_bridge_port *p; | |
9d6f229f | 246 | |
1da177e4 LT |
247 | index = find_portno(br); |
248 | if (index < 0) | |
249 | return ERR_PTR(index); | |
250 | ||
cee48541 | 251 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 LT |
252 | if (p == NULL) |
253 | return ERR_PTR(-ENOMEM); | |
254 | ||
1da177e4 LT |
255 | p->br = br; |
256 | dev_hold(dev); | |
257 | p->dev = dev; | |
4433f420 | 258 | p->path_cost = port_cost(dev); |
9d6f229f | 259 | p->priority = 0x8000 >> BR_PORT_BITS; |
1da177e4 | 260 | p->port_no = index; |
3982d3d2 | 261 | p->flags = 0; |
1da177e4 LT |
262 | br_init_port(p); |
263 | p->state = BR_STATE_DISABLED; | |
d32439c0 | 264 | br_stp_port_timer_init(p); |
3fe2d7c7 | 265 | br_multicast_add_port(p); |
1da177e4 LT |
266 | |
267 | return p; | |
268 | } | |
269 | ||
384912ed MH |
270 | static struct device_type br_type = { |
271 | .name = "bridge", | |
272 | }; | |
273 | ||
4aa678ba | 274 | int br_add_bridge(struct net *net, const char *name) |
1da177e4 LT |
275 | { |
276 | struct net_device *dev; | |
277 | int ret; | |
278 | ||
4aa678ba | 279 | dev = new_bridge_dev(net, name); |
9d6f229f | 280 | if (!dev) |
1da177e4 LT |
281 | return -ENOMEM; |
282 | ||
283 | rtnl_lock(); | |
284 | if (strchr(dev->name, '%')) { | |
285 | ret = dev_alloc_name(dev, dev->name); | |
e340a90e PE |
286 | if (ret < 0) |
287 | goto out_free; | |
1da177e4 LT |
288 | } |
289 | ||
384912ed MH |
290 | SET_NETDEV_DEVTYPE(dev, &br_type); |
291 | ||
1da177e4 | 292 | ret = register_netdevice(dev); |
e340a90e PE |
293 | if (ret) |
294 | goto out_free; | |
1da177e4 | 295 | |
1da177e4 | 296 | ret = br_sysfs_addbr(dev); |
ac05202e | 297 | if (ret) |
36485707 JB |
298 | unregister_netdevice(dev); |
299 | out: | |
1da177e4 | 300 | rtnl_unlock(); |
ac05202e | 301 | return ret; |
e340a90e PE |
302 | |
303 | out_free: | |
304 | free_netdev(dev); | |
305 | goto out; | |
1da177e4 LT |
306 | } |
307 | ||
4aa678ba | 308 | int br_del_bridge(struct net *net, const char *name) |
1da177e4 LT |
309 | { |
310 | struct net_device *dev; | |
311 | int ret = 0; | |
312 | ||
313 | rtnl_lock(); | |
4aa678ba | 314 | dev = __dev_get_by_name(net, name); |
9d6f229f | 315 | if (dev == NULL) |
1da177e4 LT |
316 | ret = -ENXIO; /* Could not find device */ |
317 | ||
318 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
319 | /* Attempt to delete non bridge device! */ | |
320 | ret = -EPERM; | |
321 | } | |
322 | ||
323 | else if (dev->flags & IFF_UP) { | |
324 | /* Not shutdown yet. */ | |
325 | ret = -EBUSY; | |
9d6f229f | 326 | } |
1da177e4 | 327 | |
9d6f229f | 328 | else |
8c56ba05 | 329 | del_br(netdev_priv(dev), NULL); |
1da177e4 LT |
330 | |
331 | rtnl_unlock(); | |
332 | return ret; | |
333 | } | |
334 | ||
46f25dff | 335 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
1da177e4 LT |
336 | int br_min_mtu(const struct net_bridge *br) |
337 | { | |
338 | const struct net_bridge_port *p; | |
339 | int mtu = 0; | |
340 | ||
341 | ASSERT_RTNL(); | |
342 | ||
343 | if (list_empty(&br->port_list)) | |
46f25dff | 344 | mtu = ETH_DATA_LEN; |
1da177e4 LT |
345 | else { |
346 | list_for_each_entry(p, &br->port_list, list) { | |
347 | if (!mtu || p->dev->mtu < mtu) | |
348 | mtu = p->dev->mtu; | |
349 | } | |
350 | } | |
351 | return mtu; | |
352 | } | |
353 | ||
81d35307 SH |
354 | /* |
355 | * Recomputes features using slave's features | |
356 | */ | |
357 | void br_features_recompute(struct net_bridge *br) | |
358 | { | |
359 | struct net_bridge_port *p; | |
b63365a2 | 360 | unsigned long features, mask; |
81d35307 | 361 | |
b63365a2 HX |
362 | features = mask = br->feature_mask; |
363 | if (list_empty(&br->port_list)) | |
364 | goto done; | |
365 | ||
366 | features &= ~NETIF_F_ONE_FOR_ALL; | |
81d35307 SH |
367 | |
368 | list_for_each_entry(p, &br->port_list, list) { | |
b63365a2 HX |
369 | features = netdev_increment_features(features, |
370 | p->dev->features, mask); | |
81d35307 SH |
371 | } |
372 | ||
b63365a2 HX |
373 | done: |
374 | br->dev->features = netdev_fix_features(features, NULL); | |
81d35307 SH |
375 | } |
376 | ||
1da177e4 LT |
377 | /* called with RTNL */ |
378 | int br_add_if(struct net_bridge *br, struct net_device *dev) | |
379 | { | |
380 | struct net_bridge_port *p; | |
381 | int err = 0; | |
382 | ||
1056bd51 SH |
383 | /* Don't allow bridging non-ethernet like devices */ |
384 | if ((dev->flags & IFF_LOOPBACK) || | |
385 | dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN) | |
1da177e4 LT |
386 | return -EINVAL; |
387 | ||
1056bd51 | 388 | /* No bridging of bridges */ |
00829823 | 389 | if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit) |
1da177e4 LT |
390 | return -ELOOP; |
391 | ||
1056bd51 | 392 | /* Device is already being bridged */ |
1da177e4 LT |
393 | if (dev->br_port != NULL) |
394 | return -EBUSY; | |
395 | ||
ad4bb6f8 JB |
396 | /* No bridging devices that dislike that (e.g. wireless) */ |
397 | if (dev->priv_flags & IFF_DONT_BRIDGE) | |
398 | return -EOPNOTSUPP; | |
399 | ||
bab1deea SH |
400 | p = new_nbp(br, dev); |
401 | if (IS_ERR(p)) | |
1da177e4 LT |
402 | return PTR_ERR(p); |
403 | ||
bc3f9076 WC |
404 | err = dev_set_promiscuity(dev, 1); |
405 | if (err) | |
406 | goto put_back; | |
407 | ||
e32cc736 GKH |
408 | err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), |
409 | SYSFS_BRIDGE_PORT_ATTR); | |
bab1deea SH |
410 | if (err) |
411 | goto err0; | |
1da177e4 | 412 | |
9d6f229f | 413 | err = br_fdb_insert(br, p, dev->dev_addr); |
bab1deea SH |
414 | if (err) |
415 | goto err1; | |
1da177e4 | 416 | |
bab1deea SH |
417 | err = br_sysfs_addif(p); |
418 | if (err) | |
419 | goto err2; | |
1da177e4 | 420 | |
bab1deea | 421 | rcu_assign_pointer(dev->br_port, p); |
0187bdfb | 422 | dev_disable_lro(dev); |
bab1deea SH |
423 | |
424 | list_add_rcu(&p->list, &br->port_list); | |
425 | ||
426 | spin_lock_bh(&br->lock); | |
427 | br_stp_recalculate_bridge_id(br); | |
428 | br_features_recompute(br); | |
de79059e AS |
429 | |
430 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) && | |
431 | (br->dev->flags & IFF_UP)) | |
432 | br_stp_enable_port(p); | |
bab1deea SH |
433 | spin_unlock_bh(&br->lock); |
434 | ||
b86c4503 SH |
435 | br_ifinfo_notify(RTM_NEWLINK, p); |
436 | ||
bab1deea | 437 | dev_set_mtu(br->dev, br_min_mtu(br)); |
269def7c | 438 | |
bab1deea | 439 | kobject_uevent(&p->kobj, KOBJ_ADD); |
1da177e4 | 440 | |
bab1deea SH |
441 | return 0; |
442 | err2: | |
1a620698 | 443 | br_fdb_delete_by_port(br, p, 1); |
bab1deea | 444 | err1: |
c587aea9 | 445 | kobject_put(&p->kobj); |
30df94f8 | 446 | p = NULL; /* kobject_put frees */ |
bab1deea | 447 | err0: |
bc3f9076 | 448 | dev_set_promiscuity(dev, -1); |
43af8532 VL |
449 | put_back: |
450 | dev_put(dev); | |
bc3f9076 | 451 | kfree(p); |
1da177e4 LT |
452 | return err; |
453 | } | |
454 | ||
455 | /* called with RTNL */ | |
456 | int br_del_if(struct net_bridge *br, struct net_device *dev) | |
457 | { | |
458 | struct net_bridge_port *p = dev->br_port; | |
9d6f229f YH |
459 | |
460 | if (!p || p->br != br) | |
1da177e4 LT |
461 | return -EINVAL; |
462 | ||
1da177e4 LT |
463 | del_nbp(p); |
464 | ||
465 | spin_lock_bh(&br->lock); | |
466 | br_stp_recalculate_bridge_id(br); | |
81d35307 | 467 | br_features_recompute(br); |
1da177e4 LT |
468 | spin_unlock_bh(&br->lock); |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
2c8c1e72 | 473 | void __net_exit br_net_exit(struct net *net) |
1da177e4 | 474 | { |
ab1b2046 | 475 | struct net_device *dev; |
8c56ba05 | 476 | LIST_HEAD(list); |
1da177e4 LT |
477 | |
478 | rtnl_lock(); | |
8c56ba05 ED |
479 | for_each_netdev(net, dev) |
480 | if (dev->priv_flags & IFF_EBRIDGE) | |
481 | del_br(netdev_priv(dev), &list); | |
482 | ||
483 | unregister_netdevice_many(&list); | |
1da177e4 LT |
484 | rtnl_unlock(); |
485 | ||
486 | } |