Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Userspace interface | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * | |
8 | * $Id: br_if.c,v 1.7 2001/12/24 00:59:55 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/netdevice.h> | |
18 | #include <linux/ethtool.h> | |
19 | #include <linux/if_arp.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/rtnetlink.h> | |
46f25dff | 23 | #include <linux/if_ether.h> |
1da177e4 LT |
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 | * Need to simulate user ioctl because not all device's that support | |
33 | * ethtool, use ethtool_ops. Also, since driver might sleep need to | |
34 | * not be holding any locks. | |
35 | */ | |
4433f420 | 36 | static int port_cost(struct net_device *dev) |
1da177e4 | 37 | { |
1da177e4 LT |
38 | struct ethtool_cmd ecmd = { ETHTOOL_GSET }; |
39 | struct ifreq ifr; | |
40 | mm_segment_t old_fs; | |
41 | int err; | |
42 | ||
43 | strncpy(ifr.ifr_name, dev->name, IFNAMSIZ); | |
44 | ifr.ifr_data = (void __user *) &ecmd; | |
45 | ||
46 | old_fs = get_fs(); | |
47 | set_fs(KERNEL_DS); | |
48 | err = dev_ethtool(&ifr); | |
49 | set_fs(old_fs); | |
50 | ||
51 | if (!err) { | |
52 | switch(ecmd.speed) { | |
53 | case SPEED_100: | |
54 | return 19; | |
55 | case SPEED_1000: | |
56 | return 4; | |
57 | case SPEED_10000: | |
58 | return 2; | |
59 | case SPEED_10: | |
60 | return 100; | |
1da177e4 LT |
61 | } |
62 | } | |
63 | ||
64 | /* Old silly heuristics based on name */ | |
65 | if (!strncmp(dev->name, "lec", 3)) | |
66 | return 7; | |
67 | ||
68 | if (!strncmp(dev->name, "plip", 4)) | |
69 | return 2500; | |
70 | ||
71 | return 100; /* assume old 10Mbps */ | |
72 | } | |
73 | ||
4433f420 SH |
74 | |
75 | /* | |
76 | * Check for port carrier transistions. | |
77 | * Called from work queue to allow for calling functions that | |
78 | * might sleep (such as speed check), and to debounce. | |
79 | */ | |
80 | static void port_carrier_check(void *arg) | |
81 | { | |
b3f1be4b SH |
82 | struct net_device *dev = arg; |
83 | struct net_bridge_port *p; | |
6e86b890 | 84 | struct net_bridge *br; |
4433f420 SH |
85 | |
86 | rtnl_lock(); | |
b3f1be4b SH |
87 | p = dev->br_port; |
88 | if (!p) | |
89 | goto done; | |
6e86b890 SH |
90 | br = p->br; |
91 | ||
92 | if (netif_carrier_ok(dev)) | |
93 | p->path_cost = port_cost(dev); | |
94 | ||
95 | if (br->dev->flags & IFF_UP) { | |
96 | spin_lock_bh(&br->lock); | |
97 | if (netif_carrier_ok(dev)) { | |
98 | if (p->state == BR_STATE_DISABLED) | |
99 | br_stp_enable_port(p); | |
100 | } else { | |
101 | if (p->state != BR_STATE_DISABLED) | |
102 | br_stp_disable_port(p); | |
4433f420 | 103 | } |
6e86b890 | 104 | spin_unlock_bh(&br->lock); |
4433f420 | 105 | } |
b3f1be4b | 106 | done: |
4433f420 SH |
107 | rtnl_unlock(); |
108 | } | |
109 | ||
bab1deea SH |
110 | static void release_nbp(struct kobject *kobj) |
111 | { | |
112 | struct net_bridge_port *p | |
113 | = container_of(kobj, struct net_bridge_port, kobj); | |
114 | kfree(p); | |
115 | } | |
116 | ||
117 | static struct kobj_type brport_ktype = { | |
118 | #ifdef CONFIG_SYSFS | |
119 | .sysfs_ops = &brport_sysfs_ops, | |
120 | #endif | |
121 | .release = release_nbp, | |
122 | }; | |
123 | ||
1da177e4 LT |
124 | static void destroy_nbp(struct net_bridge_port *p) |
125 | { | |
126 | struct net_device *dev = p->dev; | |
127 | ||
1da177e4 LT |
128 | p->br = NULL; |
129 | p->dev = NULL; | |
130 | dev_put(dev); | |
131 | ||
bab1deea | 132 | kobject_put(&p->kobj); |
1da177e4 LT |
133 | } |
134 | ||
135 | static void destroy_nbp_rcu(struct rcu_head *head) | |
136 | { | |
137 | struct net_bridge_port *p = | |
138 | container_of(head, struct net_bridge_port, rcu); | |
139 | destroy_nbp(p); | |
140 | } | |
141 | ||
3f4cfc2d SH |
142 | /* Delete port(interface) from bridge is done in two steps. |
143 | * via RCU. First step, marks device as down. That deletes | |
144 | * all the timers and stops new packets from flowing through. | |
145 | * | |
146 | * Final cleanup doesn't occur until after all CPU's finished | |
147 | * processing packets. | |
148 | * | |
149 | * Protected from multiple admin operations by RTNL mutex | |
150 | */ | |
1da177e4 LT |
151 | static void del_nbp(struct net_bridge_port *p) |
152 | { | |
153 | struct net_bridge *br = p->br; | |
154 | struct net_device *dev = p->dev; | |
155 | ||
bab1deea SH |
156 | sysfs_remove_link(&br->ifobj, dev->name); |
157 | ||
1da177e4 LT |
158 | dev_set_promiscuity(dev, -1); |
159 | ||
4433f420 | 160 | cancel_delayed_work(&p->carrier_check); |
4433f420 | 161 | |
1da177e4 LT |
162 | spin_lock_bh(&br->lock); |
163 | br_stp_disable_port(p); | |
164 | spin_unlock_bh(&br->lock); | |
165 | ||
166 | br_fdb_delete_by_port(br, p); | |
167 | ||
168 | list_del_rcu(&p->list); | |
169 | ||
b3f1be4b SH |
170 | rcu_assign_pointer(dev->br_port, NULL); |
171 | ||
125a12cc | 172 | kobject_uevent(&p->kobj, KOBJ_REMOVE); |
bab1deea SH |
173 | kobject_del(&p->kobj); |
174 | ||
1da177e4 LT |
175 | call_rcu(&p->rcu, destroy_nbp_rcu); |
176 | } | |
177 | ||
178 | /* called with RTNL */ | |
179 | static void del_br(struct net_bridge *br) | |
180 | { | |
181 | struct net_bridge_port *p, *n; | |
182 | ||
183 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
1da177e4 LT |
184 | del_nbp(p); |
185 | } | |
186 | ||
187 | del_timer_sync(&br->gc_timer); | |
188 | ||
189 | br_sysfs_delbr(br->dev); | |
190 | unregister_netdevice(br->dev); | |
191 | } | |
192 | ||
193 | static struct net_device *new_bridge_dev(const char *name) | |
194 | { | |
195 | struct net_bridge *br; | |
196 | struct net_device *dev; | |
197 | ||
198 | dev = alloc_netdev(sizeof(struct net_bridge), name, | |
199 | br_dev_setup); | |
200 | ||
201 | if (!dev) | |
202 | return NULL; | |
203 | ||
204 | br = netdev_priv(dev); | |
205 | br->dev = dev; | |
206 | ||
207 | spin_lock_init(&br->lock); | |
208 | INIT_LIST_HEAD(&br->port_list); | |
209 | spin_lock_init(&br->hash_lock); | |
210 | ||
211 | br->bridge_id.prio[0] = 0x80; | |
212 | br->bridge_id.prio[1] = 0x00; | |
cee48541 SH |
213 | |
214 | memcpy(br->group_addr, br_group_address, ETH_ALEN); | |
1da177e4 | 215 | |
edb5e46f | 216 | br->feature_mask = dev->features; |
1da177e4 LT |
217 | br->stp_enabled = 0; |
218 | br->designated_root = br->bridge_id; | |
219 | br->root_path_cost = 0; | |
220 | br->root_port = 0; | |
221 | br->bridge_max_age = br->max_age = 20 * HZ; | |
222 | br->bridge_hello_time = br->hello_time = 2 * HZ; | |
223 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; | |
224 | br->topology_change = 0; | |
225 | br->topology_change_detected = 0; | |
226 | br->ageing_time = 300 * HZ; | |
227 | INIT_LIST_HEAD(&br->age_list); | |
228 | ||
229 | br_stp_timer_init(br); | |
230 | ||
231 | return dev; | |
232 | } | |
233 | ||
234 | /* find an available port number */ | |
235 | static int find_portno(struct net_bridge *br) | |
236 | { | |
237 | int index; | |
238 | struct net_bridge_port *p; | |
239 | unsigned long *inuse; | |
240 | ||
3b781fa1 | 241 | inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long), |
1da177e4 LT |
242 | GFP_KERNEL); |
243 | if (!inuse) | |
244 | return -ENOMEM; | |
245 | ||
1da177e4 LT |
246 | set_bit(0, inuse); /* zero is reserved */ |
247 | list_for_each_entry(p, &br->port_list, list) { | |
248 | set_bit(p->port_no, inuse); | |
249 | } | |
250 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); | |
251 | kfree(inuse); | |
252 | ||
253 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; | |
254 | } | |
255 | ||
4433f420 | 256 | /* called with RTNL but without bridge lock */ |
1da177e4 | 257 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
4433f420 | 258 | struct net_device *dev) |
1da177e4 LT |
259 | { |
260 | int index; | |
261 | struct net_bridge_port *p; | |
262 | ||
263 | index = find_portno(br); | |
264 | if (index < 0) | |
265 | return ERR_PTR(index); | |
266 | ||
cee48541 | 267 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 LT |
268 | if (p == NULL) |
269 | return ERR_PTR(-ENOMEM); | |
270 | ||
1da177e4 LT |
271 | p->br = br; |
272 | dev_hold(dev); | |
273 | p->dev = dev; | |
4433f420 | 274 | p->path_cost = port_cost(dev); |
1da177e4 | 275 | p->priority = 0x8000 >> BR_PORT_BITS; |
1da177e4 LT |
276 | p->port_no = index; |
277 | br_init_port(p); | |
278 | p->state = BR_STATE_DISABLED; | |
b3f1be4b | 279 | INIT_WORK(&p->carrier_check, port_carrier_check, dev); |
d32439c0 | 280 | br_stp_port_timer_init(p); |
1da177e4 | 281 | |
d32439c0 | 282 | kobject_init(&p->kobj); |
bab1deea SH |
283 | kobject_set_name(&p->kobj, SYSFS_BRIDGE_PORT_ATTR); |
284 | p->kobj.ktype = &brport_ktype; | |
285 | p->kobj.parent = &(dev->class_dev.kobj); | |
286 | p->kobj.kset = NULL; | |
287 | ||
1da177e4 LT |
288 | return p; |
289 | } | |
290 | ||
291 | int br_add_bridge(const char *name) | |
292 | { | |
293 | struct net_device *dev; | |
294 | int ret; | |
295 | ||
296 | dev = new_bridge_dev(name); | |
297 | if (!dev) | |
298 | return -ENOMEM; | |
299 | ||
300 | rtnl_lock(); | |
301 | if (strchr(dev->name, '%')) { | |
302 | ret = dev_alloc_name(dev, dev->name); | |
303 | if (ret < 0) | |
304 | goto err1; | |
305 | } | |
306 | ||
307 | ret = register_netdevice(dev); | |
308 | if (ret) | |
309 | goto err2; | |
310 | ||
311 | /* network device kobject is not setup until | |
312 | * after rtnl_unlock does it's hotplug magic. | |
313 | * so hold reference to avoid race. | |
314 | */ | |
315 | dev_hold(dev); | |
316 | rtnl_unlock(); | |
317 | ||
318 | ret = br_sysfs_addbr(dev); | |
319 | dev_put(dev); | |
320 | ||
321 | if (ret) | |
322 | unregister_netdev(dev); | |
323 | out: | |
324 | return ret; | |
325 | ||
326 | err2: | |
327 | free_netdev(dev); | |
328 | err1: | |
329 | rtnl_unlock(); | |
330 | goto out; | |
331 | } | |
332 | ||
333 | int br_del_bridge(const char *name) | |
334 | { | |
335 | struct net_device *dev; | |
336 | int ret = 0; | |
337 | ||
338 | rtnl_lock(); | |
339 | dev = __dev_get_by_name(name); | |
340 | if (dev == NULL) | |
341 | ret = -ENXIO; /* Could not find device */ | |
342 | ||
343 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
344 | /* Attempt to delete non bridge device! */ | |
345 | ret = -EPERM; | |
346 | } | |
347 | ||
348 | else if (dev->flags & IFF_UP) { | |
349 | /* Not shutdown yet. */ | |
350 | ret = -EBUSY; | |
351 | } | |
352 | ||
353 | else | |
354 | del_br(netdev_priv(dev)); | |
355 | ||
356 | rtnl_unlock(); | |
357 | return ret; | |
358 | } | |
359 | ||
46f25dff | 360 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
1da177e4 LT |
361 | int br_min_mtu(const struct net_bridge *br) |
362 | { | |
363 | const struct net_bridge_port *p; | |
364 | int mtu = 0; | |
365 | ||
366 | ASSERT_RTNL(); | |
367 | ||
368 | if (list_empty(&br->port_list)) | |
46f25dff | 369 | mtu = ETH_DATA_LEN; |
1da177e4 LT |
370 | else { |
371 | list_for_each_entry(p, &br->port_list, list) { | |
372 | if (!mtu || p->dev->mtu < mtu) | |
373 | mtu = p->dev->mtu; | |
374 | } | |
375 | } | |
376 | return mtu; | |
377 | } | |
378 | ||
81d35307 SH |
379 | /* |
380 | * Recomputes features using slave's features | |
381 | */ | |
382 | void br_features_recompute(struct net_bridge *br) | |
383 | { | |
384 | struct net_bridge_port *p; | |
385 | unsigned long features, checksum; | |
386 | ||
edb5e46f SH |
387 | features = br->feature_mask &~ NETIF_F_IP_CSUM; |
388 | checksum = br->feature_mask & NETIF_F_IP_CSUM; | |
81d35307 SH |
389 | |
390 | list_for_each_entry(p, &br->port_list, list) { | |
391 | if (!(p->dev->features | |
392 | & (NETIF_F_IP_CSUM|NETIF_F_NO_CSUM|NETIF_F_HW_CSUM))) | |
393 | checksum = 0; | |
394 | features &= p->dev->features; | |
395 | } | |
396 | ||
397 | br->dev->features = features | checksum | NETIF_F_LLTX; | |
398 | } | |
399 | ||
1da177e4 LT |
400 | /* called with RTNL */ |
401 | int br_add_if(struct net_bridge *br, struct net_device *dev) | |
402 | { | |
403 | struct net_bridge_port *p; | |
404 | int err = 0; | |
405 | ||
406 | if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER) | |
407 | return -EINVAL; | |
408 | ||
409 | if (dev->hard_start_xmit == br_dev_xmit) | |
410 | return -ELOOP; | |
411 | ||
412 | if (dev->br_port != NULL) | |
413 | return -EBUSY; | |
414 | ||
bab1deea SH |
415 | p = new_nbp(br, dev); |
416 | if (IS_ERR(p)) | |
1da177e4 LT |
417 | return PTR_ERR(p); |
418 | ||
bab1deea SH |
419 | err = kobject_add(&p->kobj); |
420 | if (err) | |
421 | goto err0; | |
1da177e4 | 422 | |
bab1deea SH |
423 | err = br_fdb_insert(br, p, dev->dev_addr); |
424 | if (err) | |
425 | goto err1; | |
1da177e4 | 426 | |
bab1deea SH |
427 | err = br_sysfs_addif(p); |
428 | if (err) | |
429 | goto err2; | |
1da177e4 | 430 | |
bab1deea SH |
431 | rcu_assign_pointer(dev->br_port, p); |
432 | dev_set_promiscuity(dev, 1); | |
433 | ||
434 | list_add_rcu(&p->list, &br->port_list); | |
435 | ||
436 | spin_lock_bh(&br->lock); | |
437 | br_stp_recalculate_bridge_id(br); | |
438 | br_features_recompute(br); | |
439 | schedule_delayed_work(&p->carrier_check, BR_PORT_DEBOUNCE); | |
440 | spin_unlock_bh(&br->lock); | |
441 | ||
442 | dev_set_mtu(br->dev, br_min_mtu(br)); | |
443 | kobject_uevent(&p->kobj, KOBJ_ADD); | |
1da177e4 | 444 | |
bab1deea SH |
445 | return 0; |
446 | err2: | |
447 | br_fdb_delete_by_port(br, p); | |
448 | err1: | |
449 | kobject_del(&p->kobj); | |
450 | err0: | |
451 | kobject_put(&p->kobj); | |
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; | |
459 | ||
460 | if (!p || p->br != br) | |
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 | ||
473 | void __exit br_cleanup_bridges(void) | |
474 | { | |
475 | struct net_device *dev, *nxt; | |
476 | ||
477 | rtnl_lock(); | |
478 | for (dev = dev_base; dev; dev = nxt) { | |
479 | nxt = dev->next; | |
480 | if (dev->priv_flags & IFF_EBRIDGE) | |
481 | del_br(dev->priv); | |
482 | } | |
483 | rtnl_unlock(); | |
484 | ||
485 | } |