blob: c2397f503b0f94e850d7da40b68e53fb16b9f9ae [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 *
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 *
Matthew Wilcox61a44b92007-07-31 14:00:02 -070032 * Since driver might sleep need to not be holding any locks.
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 */
Stephen Hemminger4433f422005-12-20 15:19:51 -080034static int port_cost(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070035{
Stephen Hemmingerb4a488d2007-08-30 22:16:22 -070036 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)) {
Matthew Wilcox61a44b92007-07-31 14:00:02 -070040 switch(ecmd.speed) {
Matthew Wilcox61a44b92007-07-31 14:00:02 -070041 case SPEED_10000:
42 return 2;
Stephen Hemmingerb4a488d2007-08-30 22:16:22 -070043 case SPEED_1000:
44 return 4;
45 case SPEED_100:
46 return 19;
Matthew Wilcox61a44b92007-07-31 14:00:02 -070047 case SPEED_10:
48 return 100;
49 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 }
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
Stephen Hemminger4433f422005-12-20 15:19:51 -080063
64/*
65 * Check for port carrier transistions.
66 * Called from work queue to allow for calling functions that
67 * might sleep (such as speed check), and to debounce.
68 */
Stephen Hemminger269def72007-02-22 01:10:18 -080069void br_port_carrier_check(struct net_bridge_port *p)
Stephen Hemminger4433f422005-12-20 15:19:51 -080070{
Stephen Hemminger269def72007-02-22 01:10:18 -080071 struct net_device *dev = p->dev;
72 struct net_bridge *br = p->br;
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -080073
Stephen Hemminger6e86b892006-03-03 17:14:51 -080074 if (netif_carrier_ok(dev))
75 p->path_cost = port_cost(dev);
Stephen Hemminger4433f422005-12-20 15:19:51 -080076
Stephen Hemminger269def72007-02-22 01:10:18 -080077 if (netif_running(br->dev)) {
Stephen Hemminger6e86b892006-03-03 17:14:51 -080078 spin_lock_bh(&br->lock);
79 if (netif_carrier_ok(dev)) {
80 if (p->state == BR_STATE_DISABLED)
81 br_stp_enable_port(p);
82 } else {
83 if (p->state != BR_STATE_DISABLED)
84 br_stp_disable_port(p);
Stephen Hemminger4433f422005-12-20 15:19:51 -080085 }
Stephen Hemminger6e86b892006-03-03 17:14:51 -080086 spin_unlock_bh(&br->lock);
Stephen Hemminger4433f422005-12-20 15:19:51 -080087 }
Stephen Hemminger4433f422005-12-20 15:19:51 -080088}
89
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -080090static void release_nbp(struct kobject *kobj)
91{
92 struct net_bridge_port *p
93 = container_of(kobj, struct net_bridge_port, kobj);
94 kfree(p);
95}
96
97static struct kobj_type brport_ktype = {
98#ifdef CONFIG_SYSFS
99 .sysfs_ops = &brport_sysfs_ops,
100#endif
101 .release = release_nbp,
102};
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104static void destroy_nbp(struct net_bridge_port *p)
105{
106 struct net_device *dev = p->dev;
107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 p->br = NULL;
109 p->dev = NULL;
110 dev_put(dev);
111
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800112 kobject_put(&p->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113}
114
115static void destroy_nbp_rcu(struct rcu_head *head)
116{
117 struct net_bridge_port *p =
118 container_of(head, struct net_bridge_port, rcu);
119 destroy_nbp(p);
120}
121
Stephen Hemminger3f4cfc22006-01-31 17:44:07 -0800122/* Delete port(interface) from bridge is done in two steps.
123 * via RCU. First step, marks device as down. That deletes
124 * all the timers and stops new packets from flowing through.
125 *
126 * Final cleanup doesn't occur until after all CPU's finished
127 * processing packets.
128 *
129 * Protected from multiple admin operations by RTNL mutex
130 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131static void del_nbp(struct net_bridge_port *p)
132{
133 struct net_bridge *br = p->br;
134 struct net_device *dev = p->dev;
135
Greg Kroah-Hartman43b98c42007-12-17 15:54:39 -0400136 sysfs_remove_link(br->ifobj, dev->name);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 dev_set_promiscuity(dev, -1);
139
140 spin_lock_bh(&br->lock);
141 br_stp_disable_port(p);
142 spin_unlock_bh(&br->lock);
143
Stephen Hemmingerb86c4502007-03-22 14:08:46 -0700144 br_ifinfo_notify(RTM_DELLINK, p);
145
Stephen Hemminger1a620692006-10-12 14:45:38 -0700146 br_fdb_delete_by_port(br, p, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148 list_del_rcu(&p->list);
149
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -0800150 rcu_assign_pointer(dev->br_port, NULL);
151
Stephen Hemminger125a12c2006-03-03 17:16:15 -0800152 kobject_uevent(&p->kobj, KOBJ_REMOVE);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800153 kobject_del(&p->kobj);
154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 call_rcu(&p->rcu, destroy_nbp_rcu);
156}
157
158/* called with RTNL */
159static void del_br(struct net_bridge *br)
160{
161 struct net_bridge_port *p, *n;
162
163 list_for_each_entry_safe(p, n, &br->port_list, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 del_nbp(p);
165 }
166
167 del_timer_sync(&br->gc_timer);
168
169 br_sysfs_delbr(br->dev);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900170 unregister_netdevice(br->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171}
172
173static struct net_device *new_bridge_dev(const char *name)
174{
175 struct net_bridge *br;
176 struct net_device *dev;
177
178 dev = alloc_netdev(sizeof(struct net_bridge), name,
179 br_dev_setup);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 if (!dev)
182 return NULL;
183
184 br = netdev_priv(dev);
185 br->dev = dev;
186
187 spin_lock_init(&br->lock);
188 INIT_LIST_HEAD(&br->port_list);
189 spin_lock_init(&br->hash_lock);
190
191 br->bridge_id.prio[0] = 0x80;
192 br->bridge_id.prio[1] = 0x00;
Stephen Hemmingercee48542006-03-20 22:57:03 -0800193
194 memcpy(br->group_addr, br_group_address, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800196 br->feature_mask = dev->features;
Stephen Hemminger9cde0702007-03-21 14:22:44 -0700197 br->stp_enabled = BR_NO_STP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 br->designated_root = br->bridge_id;
199 br->root_path_cost = 0;
200 br->root_port = 0;
201 br->bridge_max_age = br->max_age = 20 * HZ;
202 br->bridge_hello_time = br->hello_time = 2 * HZ;
203 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
204 br->topology_change = 0;
205 br->topology_change_detected = 0;
206 br->ageing_time = 300 * HZ;
207 INIT_LIST_HEAD(&br->age_list);
208
209 br_stp_timer_init(br);
210
211 return dev;
212}
213
214/* find an available port number */
215static int find_portno(struct net_bridge *br)
216{
217 int index;
218 struct net_bridge_port *p;
219 unsigned long *inuse;
220
Stephen Hemminger3b781fa2006-03-20 22:56:50 -0800221 inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 GFP_KERNEL);
223 if (!inuse)
224 return -ENOMEM;
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 set_bit(0, inuse); /* zero is reserved */
227 list_for_each_entry(p, &br->port_list, list) {
228 set_bit(p->port_no, inuse);
229 }
230 index = find_first_zero_bit(inuse, BR_MAX_PORTS);
231 kfree(inuse);
232
233 return (index >= BR_MAX_PORTS) ? -EXFULL : index;
234}
235
Stephen Hemminger4433f422005-12-20 15:19:51 -0800236/* called with RTNL but without bridge lock */
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900237static struct net_bridge_port *new_nbp(struct net_bridge *br,
Stephen Hemminger4433f422005-12-20 15:19:51 -0800238 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239{
240 int index;
241 struct net_bridge_port *p;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900242
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 index = find_portno(br);
244 if (index < 0)
245 return ERR_PTR(index);
246
Stephen Hemmingercee48542006-03-20 22:57:03 -0800247 p = kzalloc(sizeof(*p), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 if (p == NULL)
249 return ERR_PTR(-ENOMEM);
250
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 p->br = br;
252 dev_hold(dev);
253 p->dev = dev;
Stephen Hemminger4433f422005-12-20 15:19:51 -0800254 p->path_cost = port_cost(dev);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900255 p->priority = 0x8000 >> BR_PORT_BITS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 p->port_no = index;
257 br_init_port(p);
258 p->state = BR_STATE_DISABLED;
Stephen Hemmingerd32439c2006-03-03 17:15:34 -0800259 br_stp_port_timer_init(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
261 return p;
262}
263
264int br_add_bridge(const char *name)
265{
266 struct net_device *dev;
267 int ret;
268
269 dev = new_bridge_dev(name);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900270 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 return -ENOMEM;
272
273 rtnl_lock();
274 if (strchr(dev->name, '%')) {
275 ret = dev_alloc_name(dev, dev->name);
Pavel Emelyanove340a902008-05-04 17:58:07 -0700276 if (ret < 0)
277 goto out_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 }
279
280 ret = register_netdevice(dev);
Pavel Emelyanove340a902008-05-04 17:58:07 -0700281 if (ret)
282 goto out_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 ret = br_sysfs_addbr(dev);
Stephen Hemmingerac052022006-05-10 13:21:53 -0700285 if (ret)
Jiri Benc36485702006-06-05 16:39:34 -0700286 unregister_netdevice(dev);
287 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 rtnl_unlock();
Stephen Hemmingerac052022006-05-10 13:21:53 -0700289 return ret;
Pavel Emelyanove340a902008-05-04 17:58:07 -0700290
291out_free:
292 free_netdev(dev);
293 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294}
295
296int br_del_bridge(const char *name)
297{
298 struct net_device *dev;
299 int ret = 0;
300
301 rtnl_lock();
Eric W. Biederman881d9662007-09-17 11:56:21 -0700302 dev = __dev_get_by_name(&init_net, name);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900303 if (dev == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 ret = -ENXIO; /* Could not find device */
305
306 else if (!(dev->priv_flags & IFF_EBRIDGE)) {
307 /* Attempt to delete non bridge device! */
308 ret = -EPERM;
309 }
310
311 else if (dev->flags & IFF_UP) {
312 /* Not shutdown yet. */
313 ret = -EBUSY;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900314 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900316 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 del_br(netdev_priv(dev));
318
319 rtnl_unlock();
320 return ret;
321}
322
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800323/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324int br_min_mtu(const struct net_bridge *br)
325{
326 const struct net_bridge_port *p;
327 int mtu = 0;
328
329 ASSERT_RTNL();
330
331 if (list_empty(&br->port_list))
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800332 mtu = ETH_DATA_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 else {
334 list_for_each_entry(p, &br->port_list, list) {
335 if (!mtu || p->dev->mtu < mtu)
336 mtu = p->dev->mtu;
337 }
338 }
339 return mtu;
340}
341
Stephen Hemminger81d35302005-05-29 14:15:17 -0700342/*
343 * Recomputes features using slave's features
344 */
345void br_features_recompute(struct net_bridge *br)
346{
347 struct net_bridge_port *p;
Herbert Xu7f353bf2007-08-10 15:47:58 -0700348 unsigned long features;
Stephen Hemminger81d35302005-05-29 14:15:17 -0700349
Herbert Xu7f353bf2007-08-10 15:47:58 -0700350 features = br->feature_mask;
Stephen Hemminger81d35302005-05-29 14:15:17 -0700351
352 list_for_each_entry(p, &br->port_list, list) {
Herbert Xu7f353bf2007-08-10 15:47:58 -0700353 features = netdev_compute_features(features, p->dev->features);
Stephen Hemminger81d35302005-05-29 14:15:17 -0700354 }
355
Herbert Xu7f353bf2007-08-10 15:47:58 -0700356 br->dev->features = features;
Stephen Hemminger81d35302005-05-29 14:15:17 -0700357}
358
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359/* called with RTNL */
360int br_add_if(struct net_bridge *br, struct net_device *dev)
361{
362 struct net_bridge_port *p;
363 int err = 0;
364
365 if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER)
366 return -EINVAL;
367
368 if (dev->hard_start_xmit == br_dev_xmit)
369 return -ELOOP;
370
371 if (dev->br_port != NULL)
372 return -EBUSY;
373
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800374 p = new_nbp(br, dev);
375 if (IS_ERR(p))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 return PTR_ERR(p);
377
Greg Kroah-Hartmane32cc732007-12-17 23:05:35 -0700378 err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
379 SYSFS_BRIDGE_PORT_ATTR);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800380 if (err)
381 goto err0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900383 err = br_fdb_insert(br, p, dev->dev_addr);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800384 if (err)
385 goto err1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800387 err = br_sysfs_addif(p);
388 if (err)
389 goto err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800391 rcu_assign_pointer(dev->br_port, p);
392 dev_set_promiscuity(dev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800394 list_add_rcu(&p->list, &br->port_list);
395
396 spin_lock_bh(&br->lock);
397 br_stp_recalculate_bridge_id(br);
398 br_features_recompute(br);
Aji Srinivasde790592007-03-07 16:10:53 -0800399
400 if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
401 (br->dev->flags & IFF_UP))
402 br_stp_enable_port(p);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800403 spin_unlock_bh(&br->lock);
404
Stephen Hemmingerb86c4502007-03-22 14:08:46 -0700405 br_ifinfo_notify(RTM_NEWLINK, p);
406
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800407 dev_set_mtu(br->dev, br_min_mtu(br));
Stephen Hemminger269def72007-02-22 01:10:18 -0800408
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800409 kobject_uevent(&p->kobj, KOBJ_ADD);
410
411 return 0;
412err2:
Stephen Hemminger1a620692006-10-12 14:45:38 -0700413 br_fdb_delete_by_port(br, p, 1);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800414err1:
415 kobject_del(&p->kobj);
Volodymyr G Lukiianyk43af8532008-04-29 03:17:42 -0700416 goto put_back;
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800417err0:
418 kobject_put(&p->kobj);
Volodymyr G Lukiianyk43af8532008-04-29 03:17:42 -0700419
420put_back:
421 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 return err;
423}
424
425/* called with RTNL */
426int br_del_if(struct net_bridge *br, struct net_device *dev)
427{
428 struct net_bridge_port *p = dev->br_port;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900429
430 if (!p || p->br != br)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 return -EINVAL;
432
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 del_nbp(p);
434
435 spin_lock_bh(&br->lock);
436 br_stp_recalculate_bridge_id(br);
Stephen Hemminger81d35302005-05-29 14:15:17 -0700437 br_features_recompute(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 spin_unlock_bh(&br->lock);
439
440 return 0;
441}
442
443void __exit br_cleanup_bridges(void)
444{
445 struct net_device *dev, *nxt;
446
447 rtnl_lock();
Eric W. Biederman881d9662007-09-17 11:56:21 -0700448 for_each_netdev_safe(&init_net, dev, nxt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 if (dev->priv_flags & IFF_EBRIDGE)
450 del_br(dev->priv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 rtnl_unlock();
452
453}