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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/netpoll.h> |
17 | #include <linux/ethtool.h> |
18 | #include <linux/if_arp.h> |
19 | #include <linux/module.h> |
20 | #include <linux/init.h> |
21 | #include <linux/rtnetlink.h> |
22 | #include <linux/if_ether.h> |
23 | #include <linux/slab.h> |
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 | * |
32 | * Since driver might sleep need to not be holding any locks. |
33 | */ |
34 | static int port_cost(struct net_device *dev) |
35 | { |
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)) { |
40 | switch(ecmd.speed) { |
41 | case SPEED_10000: |
42 | return 2; |
43 | case SPEED_1000: |
44 | return 4; |
45 | case SPEED_100: |
46 | return 19; |
47 | case SPEED_10: |
48 | return 100; |
49 | } |
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 | |
63 | |
64 | /* Check for port carrier transistions. */ |
65 | void br_port_carrier_check(struct net_bridge_port *p) |
66 | { |
67 | struct net_device *dev = p->dev; |
68 | struct net_bridge *br = p->br; |
69 | |
70 | if (netif_running(dev) && netif_carrier_ok(dev)) |
71 | p->path_cost = port_cost(dev); |
72 | |
73 | if (!netif_running(br->dev)) |
74 | return; |
75 | |
76 | spin_lock_bh(&br->lock); |
77 | if (netif_running(dev) && 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); |
83 | } |
84 | spin_unlock_bh(&br->lock); |
85 | } |
86 | |
87 | static void release_nbp(struct kobject *kobj) |
88 | { |
89 | struct net_bridge_port *p |
90 | = container_of(kobj, struct net_bridge_port, kobj); |
91 | kfree(p); |
92 | } |
93 | |
94 | static struct kobj_type brport_ktype = { |
95 | #ifdef CONFIG_SYSFS |
96 | .sysfs_ops = &brport_sysfs_ops, |
97 | #endif |
98 | .release = release_nbp, |
99 | }; |
100 | |
101 | static void destroy_nbp(struct net_bridge_port *p) |
102 | { |
103 | struct net_device *dev = p->dev; |
104 | |
105 | p->br = NULL; |
106 | p->dev = NULL; |
107 | dev_put(dev); |
108 | |
109 | kobject_put(&p->kobj); |
110 | } |
111 | |
112 | static void destroy_nbp_rcu(struct rcu_head *head) |
113 | { |
114 | struct net_bridge_port *p = |
115 | container_of(head, struct net_bridge_port, rcu); |
116 | destroy_nbp(p); |
117 | } |
118 | |
119 | /* Delete port(interface) from bridge is done in two steps. |
120 | * via RCU. First step, marks device as down. That deletes |
121 | * all the timers and stops new packets from flowing through. |
122 | * |
123 | * Final cleanup doesn't occur until after all CPU's finished |
124 | * processing packets. |
125 | * |
126 | * Protected from multiple admin operations by RTNL mutex |
127 | */ |
128 | static void del_nbp(struct net_bridge_port *p) |
129 | { |
130 | struct net_bridge *br = p->br; |
131 | struct net_device *dev = p->dev; |
132 | |
133 | sysfs_remove_link(br->ifobj, p->dev->name); |
134 | |
135 | dev_set_promiscuity(dev, -1); |
136 | |
137 | spin_lock_bh(&br->lock); |
138 | br_stp_disable_port(p); |
139 | spin_unlock_bh(&br->lock); |
140 | |
141 | br_ifinfo_notify(RTM_DELLINK, p); |
142 | |
143 | br_fdb_delete_by_port(br, p, 1); |
144 | |
145 | list_del_rcu(&p->list); |
146 | |
147 | dev->priv_flags &= ~IFF_BRIDGE_PORT; |
148 | |
149 | netdev_rx_handler_unregister(dev); |
150 | |
151 | netdev_set_master(dev, NULL); |
152 | |
153 | br_multicast_del_port(p); |
154 | |
155 | kobject_uevent(&p->kobj, KOBJ_REMOVE); |
156 | kobject_del(&p->kobj); |
157 | |
158 | br_netpoll_disable(p); |
159 | |
160 | call_rcu(&p->rcu, destroy_nbp_rcu); |
161 | } |
162 | |
163 | /* called with RTNL */ |
164 | static void del_br(struct net_bridge *br, struct list_head *head) |
165 | { |
166 | struct net_bridge_port *p, *n; |
167 | |
168 | list_for_each_entry_safe(p, n, &br->port_list, list) { |
169 | del_nbp(p); |
170 | } |
171 | |
172 | del_timer_sync(&br->gc_timer); |
173 | |
174 | br_sysfs_delbr(br->dev); |
175 | unregister_netdevice_queue(br->dev, head); |
176 | } |
177 | |
178 | static struct net_device *new_bridge_dev(struct net *net, const char *name) |
179 | { |
180 | struct net_bridge *br; |
181 | struct net_device *dev; |
182 | |
183 | dev = alloc_netdev(sizeof(struct net_bridge), name, |
184 | br_dev_setup); |
185 | |
186 | if (!dev) |
187 | return NULL; |
188 | dev_net_set(dev, net); |
189 | |
190 | br = netdev_priv(dev); |
191 | br->dev = dev; |
192 | |
193 | br->stats = alloc_percpu(struct br_cpu_netstats); |
194 | if (!br->stats) { |
195 | free_netdev(dev); |
196 | return NULL; |
197 | } |
198 | |
199 | spin_lock_init(&br->lock); |
200 | INIT_LIST_HEAD(&br->port_list); |
201 | spin_lock_init(&br->hash_lock); |
202 | |
203 | br->bridge_id.prio[0] = 0x80; |
204 | br->bridge_id.prio[1] = 0x00; |
205 | |
206 | memcpy(br->group_addr, br_group_address, ETH_ALEN); |
207 | |
208 | br->feature_mask = dev->features; |
209 | br->stp_enabled = BR_NO_STP; |
210 | br->designated_root = br->bridge_id; |
211 | br->root_path_cost = 0; |
212 | br->root_port = 0; |
213 | br->bridge_max_age = br->max_age = 20 * HZ; |
214 | br->bridge_hello_time = br->hello_time = 2 * HZ; |
215 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; |
216 | br->topology_change = 0; |
217 | br->topology_change_detected = 0; |
218 | br->ageing_time = 300 * HZ; |
219 | |
220 | br_netfilter_rtable_init(br); |
221 | |
222 | br_stp_timer_init(br); |
223 | br_multicast_init(br); |
224 | |
225 | return dev; |
226 | } |
227 | |
228 | /* find an available port number */ |
229 | static int find_portno(struct net_bridge *br) |
230 | { |
231 | int index; |
232 | struct net_bridge_port *p; |
233 | unsigned long *inuse; |
234 | |
235 | inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long), |
236 | GFP_KERNEL); |
237 | if (!inuse) |
238 | return -ENOMEM; |
239 | |
240 | set_bit(0, inuse); /* zero is reserved */ |
241 | list_for_each_entry(p, &br->port_list, list) { |
242 | set_bit(p->port_no, inuse); |
243 | } |
244 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); |
245 | kfree(inuse); |
246 | |
247 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; |
248 | } |
249 | |
250 | /* called with RTNL but without bridge lock */ |
251 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
252 | struct net_device *dev) |
253 | { |
254 | int index; |
255 | struct net_bridge_port *p; |
256 | |
257 | index = find_portno(br); |
258 | if (index < 0) |
259 | return ERR_PTR(index); |
260 | |
261 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
262 | if (p == NULL) |
263 | return ERR_PTR(-ENOMEM); |
264 | |
265 | p->br = br; |
266 | dev_hold(dev); |
267 | p->dev = dev; |
268 | p->path_cost = port_cost(dev); |
269 | p->priority = 0x8000 >> BR_PORT_BITS; |
270 | p->port_no = index; |
271 | p->flags = 0; |
272 | br_init_port(p); |
273 | p->state = BR_STATE_DISABLED; |
274 | br_stp_port_timer_init(p); |
275 | br_multicast_add_port(p); |
276 | |
277 | return p; |
278 | } |
279 | |
280 | static struct device_type br_type = { |
281 | .name = "bridge", |
282 | }; |
283 | |
284 | int br_add_bridge(struct net *net, const char *name) |
285 | { |
286 | struct net_device *dev; |
287 | int ret; |
288 | |
289 | dev = new_bridge_dev(net, name); |
290 | if (!dev) |
291 | return -ENOMEM; |
292 | |
293 | rtnl_lock(); |
294 | if (strchr(dev->name, '%')) { |
295 | ret = dev_alloc_name(dev, dev->name); |
296 | if (ret < 0) |
297 | goto out_free; |
298 | } |
299 | |
300 | SET_NETDEV_DEVTYPE(dev, &br_type); |
301 | |
302 | ret = register_netdevice(dev); |
303 | if (ret) |
304 | goto out_free; |
305 | |
306 | ret = br_sysfs_addbr(dev); |
307 | if (ret) |
308 | unregister_netdevice(dev); |
309 | out: |
310 | rtnl_unlock(); |
311 | return ret; |
312 | |
313 | out_free: |
314 | free_netdev(dev); |
315 | goto out; |
316 | } |
317 | |
318 | int br_del_bridge(struct net *net, const char *name) |
319 | { |
320 | struct net_device *dev; |
321 | int ret = 0; |
322 | |
323 | rtnl_lock(); |
324 | dev = __dev_get_by_name(net, name); |
325 | if (dev == NULL) |
326 | ret = -ENXIO; /* Could not find device */ |
327 | |
328 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { |
329 | /* Attempt to delete non bridge device! */ |
330 | ret = -EPERM; |
331 | } |
332 | |
333 | else if (dev->flags & IFF_UP) { |
334 | /* Not shutdown yet. */ |
335 | ret = -EBUSY; |
336 | } |
337 | |
338 | else |
339 | del_br(netdev_priv(dev), NULL); |
340 | |
341 | rtnl_unlock(); |
342 | return ret; |
343 | } |
344 | |
345 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
346 | int br_min_mtu(const struct net_bridge *br) |
347 | { |
348 | const struct net_bridge_port *p; |
349 | int mtu = 0; |
350 | |
351 | ASSERT_RTNL(); |
352 | |
353 | if (list_empty(&br->port_list)) |
354 | mtu = ETH_DATA_LEN; |
355 | else { |
356 | list_for_each_entry(p, &br->port_list, list) { |
357 | if (!mtu || p->dev->mtu < mtu) |
358 | mtu = p->dev->mtu; |
359 | } |
360 | } |
361 | return mtu; |
362 | } |
363 | |
364 | /* |
365 | * Recomputes features using slave's features |
366 | */ |
367 | void br_features_recompute(struct net_bridge *br) |
368 | { |
369 | struct net_bridge_port *p; |
370 | u32 features, mask; |
371 | |
372 | features = mask = br->feature_mask; |
373 | if (list_empty(&br->port_list)) |
374 | goto done; |
375 | |
376 | features &= ~NETIF_F_ONE_FOR_ALL; |
377 | |
378 | list_for_each_entry(p, &br->port_list, list) { |
379 | features = netdev_increment_features(features, |
380 | p->dev->features, mask); |
381 | } |
382 | |
383 | done: |
384 | br->dev->features = netdev_fix_features(br->dev, features); |
385 | } |
386 | |
387 | /* called with RTNL */ |
388 | int br_add_if(struct net_bridge *br, struct net_device *dev) |
389 | { |
390 | struct net_bridge_port *p; |
391 | int err = 0; |
392 | bool changed_addr; |
393 | |
394 | /* Don't allow bridging non-ethernet like devices */ |
395 | if ((dev->flags & IFF_LOOPBACK) || |
396 | dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN) |
397 | return -EINVAL; |
398 | |
399 | /* No bridging of bridges */ |
400 | if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit) |
401 | return -ELOOP; |
402 | |
403 | /* Device is already being bridged */ |
404 | if (br_port_exists(dev)) |
405 | return -EBUSY; |
406 | |
407 | /* No bridging devices that dislike that (e.g. wireless) */ |
408 | if (dev->priv_flags & IFF_DONT_BRIDGE) |
409 | return -EOPNOTSUPP; |
410 | |
411 | p = new_nbp(br, dev); |
412 | if (IS_ERR(p)) |
413 | return PTR_ERR(p); |
414 | |
415 | err = dev_set_promiscuity(dev, 1); |
416 | if (err) |
417 | goto put_back; |
418 | |
419 | err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), |
420 | SYSFS_BRIDGE_PORT_ATTR); |
421 | if (err) |
422 | goto err0; |
423 | |
424 | err = br_fdb_insert(br, p, dev->dev_addr); |
425 | if (err) |
426 | goto err1; |
427 | |
428 | err = br_sysfs_addif(p); |
429 | if (err) |
430 | goto err2; |
431 | |
432 | if (br_netpoll_info(br) && ((err = br_netpoll_enable(p)))) |
433 | goto err3; |
434 | |
435 | err = netdev_set_master(dev, br->dev); |
436 | if (err) |
437 | goto err3; |
438 | |
439 | err = netdev_rx_handler_register(dev, br_handle_frame, p); |
440 | if (err) |
441 | goto err4; |
442 | |
443 | dev->priv_flags |= IFF_BRIDGE_PORT; |
444 | |
445 | dev_disable_lro(dev); |
446 | |
447 | list_add_rcu(&p->list, &br->port_list); |
448 | |
449 | spin_lock_bh(&br->lock); |
450 | changed_addr = br_stp_recalculate_bridge_id(br); |
451 | br_features_recompute(br); |
452 | |
453 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) && |
454 | (br->dev->flags & IFF_UP)) |
455 | br_stp_enable_port(p); |
456 | spin_unlock_bh(&br->lock); |
457 | |
458 | br_ifinfo_notify(RTM_NEWLINK, p); |
459 | |
460 | if (changed_addr) |
461 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
462 | |
463 | dev_set_mtu(br->dev, br_min_mtu(br)); |
464 | |
465 | kobject_uevent(&p->kobj, KOBJ_ADD); |
466 | |
467 | return 0; |
468 | |
469 | err4: |
470 | netdev_set_master(dev, NULL); |
471 | err3: |
472 | sysfs_remove_link(br->ifobj, p->dev->name); |
473 | err2: |
474 | br_fdb_delete_by_port(br, p, 1); |
475 | err1: |
476 | kobject_put(&p->kobj); |
477 | p = NULL; /* kobject_put frees */ |
478 | err0: |
479 | dev_set_promiscuity(dev, -1); |
480 | put_back: |
481 | dev_put(dev); |
482 | kfree(p); |
483 | return err; |
484 | } |
485 | |
486 | /* called with RTNL */ |
487 | int br_del_if(struct net_bridge *br, struct net_device *dev) |
488 | { |
489 | struct net_bridge_port *p; |
490 | |
491 | p = br_port_get_rtnl(dev); |
492 | if (!p || p->br != br) |
493 | return -EINVAL; |
494 | |
495 | del_nbp(p); |
496 | |
497 | spin_lock_bh(&br->lock); |
498 | br_stp_recalculate_bridge_id(br); |
499 | br_features_recompute(br); |
500 | spin_unlock_bh(&br->lock); |
501 | |
502 | return 0; |
503 | } |
504 | |
505 | void __net_exit br_net_exit(struct net *net) |
506 | { |
507 | struct net_device *dev; |
508 | LIST_HEAD(list); |
509 | |
510 | rtnl_lock(); |
511 | for_each_netdev(net, dev) |
512 | if (dev->priv_flags & IFF_EBRIDGE) |
513 | del_br(netdev_priv(dev), &list); |
514 | |
515 | unregister_netdevice_many(&list); |
516 | rtnl_unlock(); |
517 | |
518 | } |
519 |
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