1
2
3
4
5
6
7
8
9
10
11
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 <net/sock.h>
23
24#include "br_private.h"
25
26
27
28
29
30
31
32static int port_cost(struct net_device *dev)
33{
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)) {
38 switch(ecmd.speed) {
39 case SPEED_10000:
40 return 2;
41 case SPEED_1000:
42 return 4;
43 case SPEED_100:
44 return 19;
45 case SPEED_10:
46 return 100;
47 }
48 }
49 }
50
51
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;
59}
60
61
62
63
64
65
66
67void br_port_carrier_check(struct net_bridge_port *p)
68{
69 struct net_device *dev = p->dev;
70 struct net_bridge *br = p->br;
71
72 if (netif_carrier_ok(dev))
73 p->path_cost = port_cost(dev);
74
75 if (netif_running(br->dev)) {
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);
83 }
84 spin_unlock_bh(&br->lock);
85 }
86}
87
88static 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
95static struct kobj_type brport_ktype = {
96#ifdef CONFIG_SYSFS
97 .sysfs_ops = &brport_sysfs_ops,
98#endif
99 .release = release_nbp,
100};
101
102static void destroy_nbp(struct net_bridge_port *p)
103{
104 struct net_device *dev = p->dev;
105
106 p->br = NULL;
107 p->dev = NULL;
108 dev_put(dev);
109
110 kobject_put(&p->kobj);
111}
112
113static 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
120
121
122
123
124
125
126
127
128
129static void del_nbp(struct net_bridge_port *p)
130{
131 struct net_bridge *br = p->br;
132 struct net_device *dev = p->dev;
133
134 sysfs_remove_link(br->ifobj, dev->name);
135
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
142 br_ifinfo_notify(RTM_DELLINK, p);
143
144 br_fdb_delete_by_port(br, p, 1);
145
146 list_del_rcu(&p->list);
147
148 rcu_assign_pointer(dev->br_port, NULL);
149
150 kobject_uevent(&p->kobj, KOBJ_REMOVE);
151 kobject_del(&p->kobj);
152
153 call_rcu(&p->rcu, destroy_nbp_rcu);
154}
155
156
157static void del_br(struct net_bridge *br)
158{
159 struct net_bridge_port *p, *n;
160
161 list_for_each_entry_safe(p, n, &br->port_list, list) {
162 del_nbp(p);
163 }
164
165 del_timer_sync(&br->gc_timer);
166
167 br_sysfs_delbr(br->dev);
168 unregister_netdevice(br->dev);
169}
170
171static struct net_device *new_bridge_dev(struct net *net, const char *name)
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);
178
179 if (!dev)
180 return NULL;
181 dev_net_set(dev, net);
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;
192
193 memcpy(br->group_addr, br_group_address, ETH_ALEN);
194
195 br->feature_mask = dev->features;
196 br->stp_enabled = BR_NO_STP;
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;
206
207 br_netfilter_rtable_init(br);
208
209 INIT_LIST_HEAD(&br->age_list);
210
211 br_stp_timer_init(br);
212
213 return dev;
214}
215
216
217static int find_portno(struct net_bridge *br)
218{
219 int index;
220 struct net_bridge_port *p;
221 unsigned long *inuse;
222
223 inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
224 GFP_KERNEL);
225 if (!inuse)
226 return -ENOMEM;
227
228 set_bit(0, inuse);
229 list_for_each_entry(p, &br->port_list, list) {
230 set_bit(p->port_no, inuse);
231 }
232 index = find_first_zero_bit(inuse, BR_MAX_PORTS);
233 kfree(inuse);
234
235 return (index >= BR_MAX_PORTS) ? -EXFULL : index;
236}
237
238
239static struct net_bridge_port *new_nbp(struct net_bridge *br,
240 struct net_device *dev)
241{
242 int index;
243 struct net_bridge_port *p;
244
245 index = find_portno(br);
246 if (index < 0)
247 return ERR_PTR(index);
248
249 p = kzalloc(sizeof(*p), GFP_KERNEL);
250 if (p == NULL)
251 return ERR_PTR(-ENOMEM);
252
253 p->br = br;
254 dev_hold(dev);
255 p->dev = dev;
256 p->path_cost = port_cost(dev);
257 p->priority = 0x8000 >> BR_PORT_BITS;
258 p->port_no = index;
259 p->flags = 0;
260 br_init_port(p);
261 p->state = BR_STATE_DISABLED;
262 br_stp_port_timer_init(p);
263
264 return p;
265}
266
267static struct device_type br_type = {
268 .name = "bridge",
269};
270
271int br_add_bridge(struct net *net, const char *name)
272{
273 struct net_device *dev;
274 int ret;
275
276 dev = new_bridge_dev(net, name);
277 if (!dev)
278 return -ENOMEM;
279
280 rtnl_lock();
281 if (strchr(dev->name, '%')) {
282 ret = dev_alloc_name(dev, dev->name);
283 if (ret < 0)
284 goto out_free;
285 }
286
287 SET_NETDEV_DEVTYPE(dev, &br_type);
288
289 ret = register_netdevice(dev);
290 if (ret)
291 goto out_free;
292
293 ret = br_sysfs_addbr(dev);
294 if (ret)
295 unregister_netdevice(dev);
296 out:
297 rtnl_unlock();
298 return ret;
299
300out_free:
301 free_netdev(dev);
302 goto out;
303}
304
305int br_del_bridge(struct net *net, const char *name)
306{
307 struct net_device *dev;
308 int ret = 0;
309
310 rtnl_lock();
311 dev = __dev_get_by_name(net, name);
312 if (dev == NULL)
313 ret = -ENXIO;
314
315 else if (!(dev->priv_flags & IFF_EBRIDGE)) {
316
317 ret = -EPERM;
318 }
319
320 else if (dev->flags & IFF_UP) {
321
322 ret = -EBUSY;
323 }
324
325 else
326 del_br(netdev_priv(dev));
327
328 rtnl_unlock();
329 return ret;
330}
331
332
333int br_min_mtu(const struct net_bridge *br)
334{
335 const struct net_bridge_port *p;
336 int mtu = 0;
337
338 ASSERT_RTNL();
339
340 if (list_empty(&br->port_list))
341 mtu = ETH_DATA_LEN;
342 else {
343 list_for_each_entry(p, &br->port_list, list) {
344 if (!mtu || p->dev->mtu < mtu)
345 mtu = p->dev->mtu;
346 }
347 }
348 return mtu;
349}
350
351
352
353
354void br_features_recompute(struct net_bridge *br)
355{
356 struct net_bridge_port *p;
357 unsigned long features, mask;
358
359 features = mask = br->feature_mask;
360 if (list_empty(&br->port_list))
361 goto done;
362
363 features &= ~NETIF_F_ONE_FOR_ALL;
364
365 list_for_each_entry(p, &br->port_list, list) {
366 features = netdev_increment_features(features,
367 p->dev->features, mask);
368 }
369
370done:
371 br->dev->features = netdev_fix_features(features, NULL);
372}
373
374
375int br_add_if(struct net_bridge *br, struct net_device *dev)
376{
377 struct net_bridge_port *p;
378 int err = 0;
379
380
381 if ((dev->flags & IFF_LOOPBACK) ||
382 dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN)
383 return -EINVAL;
384
385
386 if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
387 return -ELOOP;
388
389
390 if (dev->br_port != NULL)
391 return -EBUSY;
392
393 p = new_nbp(br, dev);
394 if (IS_ERR(p))
395 return PTR_ERR(p);
396
397 err = dev_set_promiscuity(dev, 1);
398 if (err)
399 goto put_back;
400
401 err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
402 SYSFS_BRIDGE_PORT_ATTR);
403 if (err)
404 goto err0;
405
406 err = br_fdb_insert(br, p, dev->dev_addr);
407 if (err)
408 goto err1;
409
410 err = br_sysfs_addif(p);
411 if (err)
412 goto err2;
413
414 rcu_assign_pointer(dev->br_port, p);
415 dev_disable_lro(dev);
416
417 list_add_rcu(&p->list, &br->port_list);
418
419 spin_lock_bh(&br->lock);
420 br_stp_recalculate_bridge_id(br);
421 br_features_recompute(br);
422
423 if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
424 (br->dev->flags & IFF_UP))
425 br_stp_enable_port(p);
426 spin_unlock_bh(&br->lock);
427
428 br_ifinfo_notify(RTM_NEWLINK, p);
429
430 dev_set_mtu(br->dev, br_min_mtu(br));
431
432 kobject_uevent(&p->kobj, KOBJ_ADD);
433
434 return 0;
435err2:
436 br_fdb_delete_by_port(br, p, 1);
437err1:
438 kobject_put(&p->kobj);
439 p = NULL;
440err0:
441 dev_set_promiscuity(dev, -1);
442put_back:
443 dev_put(dev);
444 kfree(p);
445 return err;
446}
447
448
449int br_del_if(struct net_bridge *br, struct net_device *dev)
450{
451 struct net_bridge_port *p = dev->br_port;
452
453 if (!p || p->br != br)
454 return -EINVAL;
455
456 del_nbp(p);
457
458 spin_lock_bh(&br->lock);
459 br_stp_recalculate_bridge_id(br);
460 br_features_recompute(br);
461 spin_unlock_bh(&br->lock);
462
463 return 0;
464}
465
466void br_net_exit(struct net *net)
467{
468 struct net_device *dev;
469
470 rtnl_lock();
471restart:
472 for_each_netdev(net, dev) {
473 if (dev->priv_flags & IFF_EBRIDGE) {
474 del_br(netdev_priv(dev));
475 goto restart;
476 }
477 }
478 rtnl_unlock();
479
480}
481