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1 | /* |
2 | * Userspace interface |
3 | * Linux ethernet bridge |
4 | * |
5 | * Authors: |
6 | * Lennert Buytenhek <buytenh@gnu.org> |
7 | * |
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> |
21 | #include <linux/if_ether.h> |
22 | #include <linux/slab.h> |
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 | * |
31 | * Since driver might sleep need to not be holding any locks. |
32 | */ |
33 | static int port_cost(struct net_device *dev) |
34 | { |
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)) { |
39 | switch(ecmd.speed) { |
40 | case SPEED_10000: |
41 | return 2; |
42 | case SPEED_1000: |
43 | return 4; |
44 | case SPEED_100: |
45 | return 19; |
46 | case SPEED_10: |
47 | return 100; |
48 | } |
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 | |
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 | */ |
68 | void br_port_carrier_check(struct net_bridge_port *p) |
69 | { |
70 | struct net_device *dev = p->dev; |
71 | struct net_bridge *br = p->br; |
72 | |
73 | if (netif_carrier_ok(dev)) |
74 | p->path_cost = port_cost(dev); |
75 | |
76 | if (netif_running(br->dev)) { |
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); |
84 | } |
85 | spin_unlock_bh(&br->lock); |
86 | } |
87 | } |
88 | |
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 | |
103 | static void destroy_nbp(struct net_bridge_port *p) |
104 | { |
105 | struct net_device *dev = p->dev; |
106 | |
107 | p->br = NULL; |
108 | p->dev = NULL; |
109 | dev_put(dev); |
110 | |
111 | kobject_put(&p->kobj); |
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 | |
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 | */ |
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 | |
135 | sysfs_remove_link(br->ifobj, dev->name); |
136 | |
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 | |
143 | br_ifinfo_notify(RTM_DELLINK, p); |
144 | |
145 | br_fdb_delete_by_port(br, p, 1); |
146 | |
147 | list_del_rcu(&p->list); |
148 | |
149 | rcu_assign_pointer(dev->br_port, NULL); |
150 | |
151 | br_multicast_del_port(p); |
152 | |
153 | kobject_uevent(&p->kobj, KOBJ_REMOVE); |
154 | kobject_del(&p->kobj); |
155 | |
156 | call_rcu(&p->rcu, destroy_nbp_rcu); |
157 | } |
158 | |
159 | /* called with RTNL */ |
160 | static void del_br(struct net_bridge *br, struct list_head *head) |
161 | { |
162 | struct net_bridge_port *p, *n; |
163 | |
164 | list_for_each_entry_safe(p, n, &br->port_list, list) { |
165 | del_nbp(p); |
166 | } |
167 | |
168 | del_timer_sync(&br->gc_timer); |
169 | |
170 | br_sysfs_delbr(br->dev); |
171 | unregister_netdevice_queue(br->dev, head); |
172 | } |
173 | |
174 | static struct net_device *new_bridge_dev(struct net *net, const char *name) |
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); |
181 | |
182 | if (!dev) |
183 | return NULL; |
184 | dev_net_set(dev, net); |
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; |
195 | |
196 | memcpy(br->group_addr, br_group_address, ETH_ALEN); |
197 | |
198 | br->feature_mask = dev->features; |
199 | br->stp_enabled = BR_NO_STP; |
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; |
209 | |
210 | br_netfilter_rtable_init(br); |
211 | |
212 | br_stp_timer_init(br); |
213 | br_multicast_init(br); |
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 | |
225 | inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long), |
226 | GFP_KERNEL); |
227 | if (!inuse) |
228 | return -ENOMEM; |
229 | |
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 | |
240 | /* called with RTNL but without bridge lock */ |
241 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
242 | struct net_device *dev) |
243 | { |
244 | int index; |
245 | struct net_bridge_port *p; |
246 | |
247 | index = find_portno(br); |
248 | if (index < 0) |
249 | return ERR_PTR(index); |
250 | |
251 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
252 | if (p == NULL) |
253 | return ERR_PTR(-ENOMEM); |
254 | |
255 | p->br = br; |
256 | dev_hold(dev); |
257 | p->dev = dev; |
258 | p->path_cost = port_cost(dev); |
259 | p->priority = 0x8000 >> BR_PORT_BITS; |
260 | p->port_no = index; |
261 | p->flags = 0; |
262 | br_init_port(p); |
263 | p->state = BR_STATE_DISABLED; |
264 | br_stp_port_timer_init(p); |
265 | br_multicast_add_port(p); |
266 | |
267 | return p; |
268 | } |
269 | |
270 | static struct device_type br_type = { |
271 | .name = "bridge", |
272 | }; |
273 | |
274 | int br_add_bridge(struct net *net, const char *name) |
275 | { |
276 | struct net_device *dev; |
277 | int ret; |
278 | |
279 | dev = new_bridge_dev(net, name); |
280 | if (!dev) |
281 | return -ENOMEM; |
282 | |
283 | rtnl_lock(); |
284 | if (strchr(dev->name, '%')) { |
285 | ret = dev_alloc_name(dev, dev->name); |
286 | if (ret < 0) |
287 | goto out_free; |
288 | } |
289 | |
290 | SET_NETDEV_DEVTYPE(dev, &br_type); |
291 | |
292 | ret = register_netdevice(dev); |
293 | if (ret) |
294 | goto out_free; |
295 | |
296 | ret = br_sysfs_addbr(dev); |
297 | if (ret) |
298 | unregister_netdevice(dev); |
299 | out: |
300 | rtnl_unlock(); |
301 | return ret; |
302 | |
303 | out_free: |
304 | free_netdev(dev); |
305 | goto out; |
306 | } |
307 | |
308 | int br_del_bridge(struct net *net, const char *name) |
309 | { |
310 | struct net_device *dev; |
311 | int ret = 0; |
312 | |
313 | rtnl_lock(); |
314 | dev = __dev_get_by_name(net, name); |
315 | if (dev == NULL) |
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; |
326 | } |
327 | |
328 | else |
329 | del_br(netdev_priv(dev), NULL); |
330 | |
331 | rtnl_unlock(); |
332 | return ret; |
333 | } |
334 | |
335 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
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)) |
344 | mtu = ETH_DATA_LEN; |
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 | |
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; |
360 | unsigned long features, mask; |
361 | |
362 | features = mask = br->feature_mask; |
363 | if (list_empty(&br->port_list)) |
364 | goto done; |
365 | |
366 | features &= ~NETIF_F_ONE_FOR_ALL; |
367 | |
368 | list_for_each_entry(p, &br->port_list, list) { |
369 | features = netdev_increment_features(features, |
370 | p->dev->features, mask); |
371 | } |
372 | |
373 | done: |
374 | br->dev->features = netdev_fix_features(features, NULL); |
375 | } |
376 | |
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 | |
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) |
386 | return -EINVAL; |
387 | |
388 | /* No bridging of bridges */ |
389 | if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit) |
390 | return -ELOOP; |
391 | |
392 | /* Device is already being bridged */ |
393 | if (dev->br_port != NULL) |
394 | return -EBUSY; |
395 | |
396 | /* No bridging devices that dislike that (e.g. wireless) */ |
397 | if (dev->priv_flags & IFF_DONT_BRIDGE) |
398 | return -EOPNOTSUPP; |
399 | |
400 | p = new_nbp(br, dev); |
401 | if (IS_ERR(p)) |
402 | return PTR_ERR(p); |
403 | |
404 | err = dev_set_promiscuity(dev, 1); |
405 | if (err) |
406 | goto put_back; |
407 | |
408 | err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), |
409 | SYSFS_BRIDGE_PORT_ATTR); |
410 | if (err) |
411 | goto err0; |
412 | |
413 | err = br_fdb_insert(br, p, dev->dev_addr); |
414 | if (err) |
415 | goto err1; |
416 | |
417 | err = br_sysfs_addif(p); |
418 | if (err) |
419 | goto err2; |
420 | |
421 | rcu_assign_pointer(dev->br_port, p); |
422 | dev_disable_lro(dev); |
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); |
429 | |
430 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) && |
431 | (br->dev->flags & IFF_UP)) |
432 | br_stp_enable_port(p); |
433 | spin_unlock_bh(&br->lock); |
434 | |
435 | br_ifinfo_notify(RTM_NEWLINK, p); |
436 | |
437 | dev_set_mtu(br->dev, br_min_mtu(br)); |
438 | |
439 | kobject_uevent(&p->kobj, KOBJ_ADD); |
440 | |
441 | return 0; |
442 | err2: |
443 | br_fdb_delete_by_port(br, p, 1); |
444 | err1: |
445 | kobject_put(&p->kobj); |
446 | p = NULL; /* kobject_put frees */ |
447 | err0: |
448 | dev_set_promiscuity(dev, -1); |
449 | put_back: |
450 | dev_put(dev); |
451 | kfree(p); |
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; |
459 | |
460 | if (!p || p->br != br) |
461 | return -EINVAL; |
462 | |
463 | del_nbp(p); |
464 | |
465 | spin_lock_bh(&br->lock); |
466 | br_stp_recalculate_bridge_id(br); |
467 | br_features_recompute(br); |
468 | spin_unlock_bh(&br->lock); |
469 | |
470 | return 0; |
471 | } |
472 | |
473 | void __net_exit br_net_exit(struct net *net) |
474 | { |
475 | struct net_device *dev; |
476 | LIST_HEAD(list); |
477 | |
478 | rtnl_lock(); |
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); |
484 | rtnl_unlock(); |
485 | |
486 | } |
487 |
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