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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Kris Katterjohn46f25df2006-01-05 16:35:42 -080023#include <linux/if_ether.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#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 */
Stephen Hemminger4433f422005-12-20 15:19:51 -080036static int port_cost(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070037{
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 }
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
Stephen Hemminger4433f422005-12-20 15:19:51 -080074
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 */
80static void port_carrier_check(void *arg)
81{
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -080082 struct net_device *dev = arg;
83 struct net_bridge_port *p;
Stephen Hemminger6e86b892006-03-03 17:14:51 -080084 struct net_bridge *br;
Stephen Hemminger4433f422005-12-20 15:19:51 -080085
86 rtnl_lock();
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -080087 p = dev->br_port;
88 if (!p)
89 goto done;
Stephen Hemminger6e86b892006-03-03 17:14:51 -080090 br = p->br;
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -080091
Stephen Hemminger6e86b892006-03-03 17:14:51 -080092 if (netif_carrier_ok(dev))
93 p->path_cost = port_cost(dev);
Stephen Hemminger4433f422005-12-20 15:19:51 -080094
Stephen Hemminger6e86b892006-03-03 17:14:51 -080095 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);
Stephen Hemminger4433f422005-12-20 15:19:51 -0800103 }
Stephen Hemminger6e86b892006-03-03 17:14:51 -0800104 spin_unlock_bh(&br->lock);
Stephen Hemminger4433f422005-12-20 15:19:51 -0800105 }
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -0800106done:
Stephen Hemminger4433f422005-12-20 15:19:51 -0800107 rtnl_unlock();
108}
109
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800110static 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
117static struct kobj_type brport_ktype = {
118#ifdef CONFIG_SYSFS
119 .sysfs_ops = &brport_sysfs_ops,
120#endif
121 .release = release_nbp,
122};
123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124static void destroy_nbp(struct net_bridge_port *p)
125{
126 struct net_device *dev = p->dev;
127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 p->br = NULL;
129 p->dev = NULL;
130 dev_put(dev);
131
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800132 kobject_put(&p->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133}
134
135static 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
Stephen Hemminger3f4cfc22006-01-31 17:44:07 -0800142/* 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151static void del_nbp(struct net_bridge_port *p)
152{
153 struct net_bridge *br = p->br;
154 struct net_device *dev = p->dev;
155
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800156 sysfs_remove_link(&br->ifobj, dev->name);
157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 dev_set_promiscuity(dev, -1);
159
Stephen Hemminger4433f422005-12-20 15:19:51 -0800160 cancel_delayed_work(&p->carrier_check);
Stephen Hemminger4433f422005-12-20 15:19:51 -0800161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 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
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -0800170 rcu_assign_pointer(dev->br_port, NULL);
171
Stephen Hemminger125a12c2006-03-03 17:16:15 -0800172 kobject_uevent(&p->kobj, KOBJ_REMOVE);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800173 kobject_del(&p->kobj);
174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 call_rcu(&p->rcu, destroy_nbp_rcu);
176}
177
178/* called with RTNL */
179static 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) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 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
193static 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;
Stephen Hemmingercee48542006-03-20 22:57:03 -0800213
214 memcpy(br->group_addr, br_group_address, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800216 br->feature_mask = dev->features;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 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 */
235static int find_portno(struct net_bridge *br)
236{
237 int index;
238 struct net_bridge_port *p;
239 unsigned long *inuse;
240
Stephen Hemminger3b781fa2006-03-20 22:56:50 -0800241 inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 GFP_KERNEL);
243 if (!inuse)
244 return -ENOMEM;
245
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 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
Stephen Hemminger4433f422005-12-20 15:19:51 -0800256/* called with RTNL but without bridge lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257static struct net_bridge_port *new_nbp(struct net_bridge *br,
Stephen Hemminger4433f422005-12-20 15:19:51 -0800258 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259{
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
Stephen Hemmingercee48542006-03-20 22:57:03 -0800267 p = kzalloc(sizeof(*p), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 if (p == NULL)
269 return ERR_PTR(-ENOMEM);
270
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 p->br = br;
272 dev_hold(dev);
273 p->dev = dev;
Stephen Hemminger4433f422005-12-20 15:19:51 -0800274 p->path_cost = port_cost(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 p->priority = 0x8000 >> BR_PORT_BITS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 p->port_no = index;
277 br_init_port(p);
278 p->state = BR_STATE_DISABLED;
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -0800279 INIT_WORK(&p->carrier_check, port_carrier_check, dev);
Stephen Hemmingerd32439c2006-03-03 17:15:34 -0800280 br_stp_port_timer_init(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
Stephen Hemmingerd32439c2006-03-03 17:15:34 -0800282 kobject_init(&p->kobj);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800283 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 return p;
289}
290
291int 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
333int 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
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800360/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361int 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))
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800369 mtu = ETH_DATA_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 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
Stephen Hemminger81d35302005-05-29 14:15:17 -0700379/*
380 * Recomputes features using slave's features
381 */
382void br_features_recompute(struct net_bridge *br)
383{
384 struct net_bridge_port *p;
385 unsigned long features, checksum;
386
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800387 features = br->feature_mask &~ NETIF_F_IP_CSUM;
388 checksum = br->feature_mask & NETIF_F_IP_CSUM;
Stephen Hemminger81d35302005-05-29 14:15:17 -0700389
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400/* called with RTNL */
401int 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
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800415 p = new_nbp(br, dev);
416 if (IS_ERR(p))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 return PTR_ERR(p);
418
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800419 err = kobject_add(&p->kobj);
420 if (err)
421 goto err0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800423 err = br_fdb_insert(br, p, dev->dev_addr);
424 if (err)
425 goto err1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800427 err = br_sysfs_addif(p);
428 if (err)
429 goto err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800431 rcu_assign_pointer(dev->br_port, p);
432 dev_set_promiscuity(dev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800434 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);
444
445 return 0;
446err2:
447 br_fdb_delete_by_port(br, p);
448err1:
449 kobject_del(&p->kobj);
450err0:
451 kobject_put(&p->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 return err;
453}
454
455/* called with RTNL */
456int 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 del_nbp(p);
464
465 spin_lock_bh(&br->lock);
466 br_stp_recalculate_bridge_id(br);
Stephen Hemminger81d35302005-05-29 14:15:17 -0700467 br_features_recompute(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 spin_unlock_bh(&br->lock);
469
470 return 0;
471}
472
473void __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}