blob: 0a09ccf68c1c16e6362f895ba389f7287520594e [file] [log] [blame]
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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * 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>
Kris Katterjohn46f25df2006-01-05 16:35:42 -080021#include <linux/if_ether.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <net/sock.h>
23
24#include "br_private.h"
25
26/*
27 * Determine initial path cost based on speed.
28 * using recommendations from 802.1d standard
29 *
Matthew Wilcox61a44b92007-07-31 14:00:02 -070030 * Since driver might sleep need to not be holding any locks.
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 */
Stephen Hemminger4433f422005-12-20 15:19:51 -080032static int port_cost(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070033{
Stephen Hemmingerb4a488d2007-08-30 22:16:22 -070034 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)) {
Matthew Wilcox61a44b92007-07-31 14:00:02 -070038 switch(ecmd.speed) {
Matthew Wilcox61a44b92007-07-31 14:00:02 -070039 case SPEED_10000:
40 return 2;
Stephen Hemmingerb4a488d2007-08-30 22:16:22 -070041 case SPEED_1000:
42 return 4;
43 case SPEED_100:
44 return 19;
Matthew Wilcox61a44b92007-07-31 14:00:02 -070045 case SPEED_10:
46 return 100;
47 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 }
49 }
50
51 /* Old silly heuristics based on name */
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; /* assume old 10Mbps */
59}
60
Stephen Hemminger4433f422005-12-20 15:19:51 -080061
62/*
63 * Check for port carrier transistions.
64 * Called from work queue to allow for calling functions that
65 * might sleep (such as speed check), and to debounce.
66 */
Stephen Hemminger269def72007-02-22 01:10:18 -080067void br_port_carrier_check(struct net_bridge_port *p)
Stephen Hemminger4433f422005-12-20 15:19:51 -080068{
Stephen Hemminger269def72007-02-22 01:10:18 -080069 struct net_device *dev = p->dev;
70 struct net_bridge *br = p->br;
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -080071
Stephen Hemminger6e86b892006-03-03 17:14:51 -080072 if (netif_carrier_ok(dev))
73 p->path_cost = port_cost(dev);
Stephen Hemminger4433f422005-12-20 15:19:51 -080074
Stephen Hemminger269def72007-02-22 01:10:18 -080075 if (netif_running(br->dev)) {
Stephen Hemminger6e86b892006-03-03 17:14:51 -080076 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);
Stephen Hemminger4433f422005-12-20 15:19:51 -080083 }
Stephen Hemminger6e86b892006-03-03 17:14:51 -080084 spin_unlock_bh(&br->lock);
Stephen Hemminger4433f422005-12-20 15:19:51 -080085 }
Stephen Hemminger4433f422005-12-20 15:19:51 -080086}
87
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -080088static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102static void destroy_nbp(struct net_bridge_port *p)
103{
104 struct net_device *dev = p->dev;
105
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 p->br = NULL;
107 p->dev = NULL;
108 dev_put(dev);
109
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800110 kobject_put(&p->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111}
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
Stephen Hemminger3f4cfc22006-01-31 17:44:07 -0800120/* Delete port(interface) from bridge is done in two steps.
121 * via RCU. First step, marks device as down. That deletes
122 * all the timers and stops new packets from flowing through.
123 *
124 * Final cleanup doesn't occur until after all CPU's finished
125 * processing packets.
126 *
127 * Protected from multiple admin operations by RTNL mutex
128 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129static void del_nbp(struct net_bridge_port *p)
130{
131 struct net_bridge *br = p->br;
132 struct net_device *dev = p->dev;
133
Greg Kroah-Hartman43b98c42007-12-17 15:54:39 -0400134 sysfs_remove_link(br->ifobj, dev->name);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 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
Stephen Hemmingerb86c4502007-03-22 14:08:46 -0700142 br_ifinfo_notify(RTM_DELLINK, p);
143
Stephen Hemminger1a620692006-10-12 14:45:38 -0700144 br_fdb_delete_by_port(br, p, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
146 list_del_rcu(&p->list);
147
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -0800148 rcu_assign_pointer(dev->br_port, NULL);
149
Stephen Hemminger125a12c2006-03-03 17:16:15 -0800150 kobject_uevent(&p->kobj, KOBJ_REMOVE);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800151 kobject_del(&p->kobj);
152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 call_rcu(&p->rcu, destroy_nbp_rcu);
154}
155
156/* called with RTNL */
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) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 del_nbp(p);
163 }
164
165 del_timer_sync(&br->gc_timer);
166
167 br_sysfs_delbr(br->dev);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900168 unregister_netdevice(br->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169}
170
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700171static struct net_device *new_bridge_dev(struct net *net, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172{
173 struct net_bridge *br;
174 struct net_device *dev;
175
176 dev = alloc_netdev(sizeof(struct net_bridge), name,
177 br_dev_setup);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 if (!dev)
180 return NULL;
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700181 dev_net_set(dev, net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
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;
Stephen Hemmingercee48542006-03-20 22:57:03 -0800192
193 memcpy(br->group_addr, br_group_address, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800195 br->feature_mask = dev->features;
Stephen Hemminger9cde0702007-03-21 14:22:44 -0700196 br->stp_enabled = BR_NO_STP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 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;
Simon Wunderlich4adf0af2008-07-30 16:27:55 -0700206
207 br_netfilter_rtable_init(br);
208
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 INIT_LIST_HEAD(&br->age_list);
210
211 br_stp_timer_init(br);
212
213 return dev;
214}
215
216/* find an available port number */
217static int find_portno(struct net_bridge *br)
218{
219 int index;
220 struct net_bridge_port *p;
221 unsigned long *inuse;
222
Stephen Hemminger3b781fa2006-03-20 22:56:50 -0800223 inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 GFP_KERNEL);
225 if (!inuse)
226 return -ENOMEM;
227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 set_bit(0, inuse); /* zero is reserved */
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
Stephen Hemminger4433f422005-12-20 15:19:51 -0800238/* called with RTNL but without bridge lock */
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900239static struct net_bridge_port *new_nbp(struct net_bridge *br,
Stephen Hemminger4433f422005-12-20 15:19:51 -0800240 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241{
242 int index;
243 struct net_bridge_port *p;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900244
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 index = find_portno(br);
246 if (index < 0)
247 return ERR_PTR(index);
248
Stephen Hemmingercee48542006-03-20 22:57:03 -0800249 p = kzalloc(sizeof(*p), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 if (p == NULL)
251 return ERR_PTR(-ENOMEM);
252
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 p->br = br;
254 dev_hold(dev);
255 p->dev = dev;
Stephen Hemminger4433f422005-12-20 15:19:51 -0800256 p->path_cost = port_cost(dev);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900257 p->priority = 0x8000 >> BR_PORT_BITS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 p->port_no = index;
259 br_init_port(p);
260 p->state = BR_STATE_DISABLED;
Stephen Hemmingerd32439c2006-03-03 17:15:34 -0800261 br_stp_port_timer_init(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
263 return p;
264}
265
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700266int br_add_bridge(struct net *net, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267{
268 struct net_device *dev;
269 int ret;
270
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700271 dev = new_bridge_dev(net, name);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900272 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 return -ENOMEM;
274
275 rtnl_lock();
276 if (strchr(dev->name, '%')) {
277 ret = dev_alloc_name(dev, dev->name);
Pavel Emelyanove340a902008-05-04 17:58:07 -0700278 if (ret < 0)
279 goto out_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 }
281
282 ret = register_netdevice(dev);
Pavel Emelyanove340a902008-05-04 17:58:07 -0700283 if (ret)
284 goto out_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 ret = br_sysfs_addbr(dev);
Stephen Hemmingerac052022006-05-10 13:21:53 -0700287 if (ret)
Jiri Benc36485702006-06-05 16:39:34 -0700288 unregister_netdevice(dev);
289 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 rtnl_unlock();
Stephen Hemmingerac052022006-05-10 13:21:53 -0700291 return ret;
Pavel Emelyanove340a902008-05-04 17:58:07 -0700292
293out_free:
294 free_netdev(dev);
295 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296}
297
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700298int br_del_bridge(struct net *net, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299{
300 struct net_device *dev;
301 int ret = 0;
302
303 rtnl_lock();
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700304 dev = __dev_get_by_name(net, name);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900305 if (dev == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 ret = -ENXIO; /* Could not find device */
307
308 else if (!(dev->priv_flags & IFF_EBRIDGE)) {
309 /* Attempt to delete non bridge device! */
310 ret = -EPERM;
311 }
312
313 else if (dev->flags & IFF_UP) {
314 /* Not shutdown yet. */
315 ret = -EBUSY;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900316 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900318 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 del_br(netdev_priv(dev));
320
321 rtnl_unlock();
322 return ret;
323}
324
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800325/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326int br_min_mtu(const struct net_bridge *br)
327{
328 const struct net_bridge_port *p;
329 int mtu = 0;
330
331 ASSERT_RTNL();
332
333 if (list_empty(&br->port_list))
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800334 mtu = ETH_DATA_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 else {
336 list_for_each_entry(p, &br->port_list, list) {
337 if (!mtu || p->dev->mtu < mtu)
338 mtu = p->dev->mtu;
339 }
340 }
341 return mtu;
342}
343
Stephen Hemminger81d35302005-05-29 14:15:17 -0700344/*
345 * Recomputes features using slave's features
346 */
347void br_features_recompute(struct net_bridge *br)
348{
349 struct net_bridge_port *p;
Herbert Xub63365a2008-10-23 01:11:29 -0700350 unsigned long features, mask;
Stephen Hemminger81d35302005-05-29 14:15:17 -0700351
Herbert Xub63365a2008-10-23 01:11:29 -0700352 features = mask = br->feature_mask;
353 if (list_empty(&br->port_list))
354 goto done;
355
356 features &= ~NETIF_F_ONE_FOR_ALL;
Stephen Hemminger81d35302005-05-29 14:15:17 -0700357
358 list_for_each_entry(p, &br->port_list, list) {
Herbert Xub63365a2008-10-23 01:11:29 -0700359 features = netdev_increment_features(features,
360 p->dev->features, mask);
Stephen Hemminger81d35302005-05-29 14:15:17 -0700361 }
362
Herbert Xub63365a2008-10-23 01:11:29 -0700363done:
364 br->dev->features = netdev_fix_features(features, NULL);
Stephen Hemminger81d35302005-05-29 14:15:17 -0700365}
366
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367/* called with RTNL */
368int br_add_if(struct net_bridge *br, struct net_device *dev)
369{
370 struct net_bridge_port *p;
371 int err = 0;
372
373 if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER)
374 return -EINVAL;
375
376 if (dev->hard_start_xmit == br_dev_xmit)
377 return -ELOOP;
378
379 if (dev->br_port != NULL)
380 return -EBUSY;
381
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800382 p = new_nbp(br, dev);
383 if (IS_ERR(p))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 return PTR_ERR(p);
385
Wang Chenbc3f9072008-07-14 20:53:13 -0700386 err = dev_set_promiscuity(dev, 1);
387 if (err)
388 goto put_back;
389
Greg Kroah-Hartmane32cc732007-12-17 23:05:35 -0700390 err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
391 SYSFS_BRIDGE_PORT_ATTR);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800392 if (err)
393 goto err0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900395 err = br_fdb_insert(br, p, dev->dev_addr);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800396 if (err)
397 goto err1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800399 err = br_sysfs_addif(p);
400 if (err)
401 goto err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800403 rcu_assign_pointer(dev->br_port, p);
Ben Hutchings0187bdf2008-06-19 16:15:47 -0700404 dev_disable_lro(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800406 list_add_rcu(&p->list, &br->port_list);
407
408 spin_lock_bh(&br->lock);
409 br_stp_recalculate_bridge_id(br);
410 br_features_recompute(br);
Aji Srinivasde790592007-03-07 16:10:53 -0800411
412 if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
413 (br->dev->flags & IFF_UP))
414 br_stp_enable_port(p);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800415 spin_unlock_bh(&br->lock);
416
Stephen Hemmingerb86c4502007-03-22 14:08:46 -0700417 br_ifinfo_notify(RTM_NEWLINK, p);
418
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800419 dev_set_mtu(br->dev, br_min_mtu(br));
Stephen Hemminger269def72007-02-22 01:10:18 -0800420
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800421 kobject_uevent(&p->kobj, KOBJ_ADD);
422
423 return 0;
424err2:
Stephen Hemminger1a620692006-10-12 14:45:38 -0700425 br_fdb_delete_by_port(br, p, 1);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800426err1:
427 kobject_del(&p->kobj);
428err0:
429 kobject_put(&p->kobj);
Wang Chenbc3f9072008-07-14 20:53:13 -0700430 dev_set_promiscuity(dev, -1);
Volodymyr G Lukiianyk43af8532008-04-29 03:17:42 -0700431put_back:
432 dev_put(dev);
Wang Chenbc3f9072008-07-14 20:53:13 -0700433 kfree(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 return err;
435}
436
437/* called with RTNL */
438int br_del_if(struct net_bridge *br, struct net_device *dev)
439{
440 struct net_bridge_port *p = dev->br_port;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900441
442 if (!p || p->br != br)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 return -EINVAL;
444
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 del_nbp(p);
446
447 spin_lock_bh(&br->lock);
448 br_stp_recalculate_bridge_id(br);
Stephen Hemminger81d35302005-05-29 14:15:17 -0700449 br_features_recompute(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 spin_unlock_bh(&br->lock);
451
452 return 0;
453}
454
Alexey Dobriyan712d6952008-09-08 16:20:18 -0700455void br_net_exit(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456{
Patrick McHardyab1b2042008-07-03 03:53:42 -0700457 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458
459 rtnl_lock();
Patrick McHardyab1b2042008-07-03 03:53:42 -0700460restart:
Alexey Dobriyan712d6952008-09-08 16:20:18 -0700461 for_each_netdev(net, dev) {
Patrick McHardyab1b2042008-07-03 03:53:42 -0700462 if (dev->priv_flags & IFF_EBRIDGE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 del_br(dev->priv);
Patrick McHardyab1b2042008-07-03 03:53:42 -0700464 goto restart;
465 }
466 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 rtnl_unlock();
468
469}