blob: aff6a779c9c82e1df96417f55d086656fc6274cc [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 *
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);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090050
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 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 */
David Howellsc4028952006-11-22 14:57:56 +000080static void port_carrier_check(struct work_struct *work)
Stephen Hemminger4433f422005-12-20 15:19:51 -080081{
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -080082 struct net_bridge_port *p;
David Howellsc4028952006-11-22 14:57:56 +000083 struct net_device *dev;
Stephen Hemminger6e86b892006-03-03 17:14:51 -080084 struct net_bridge *br;
Stephen Hemminger4433f422005-12-20 15:19:51 -080085
David Howellsc4028952006-11-22 14:57:56 +000086 dev = container_of(work, struct net_bridge_port,
87 carrier_check.work)->dev;
88 work_release(work);
89
Stephen Hemminger4433f422005-12-20 15:19:51 -080090 rtnl_lock();
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -080091 p = dev->br_port;
92 if (!p)
93 goto done;
Stephen Hemminger6e86b892006-03-03 17:14:51 -080094 br = p->br;
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -080095
Stephen Hemminger6e86b892006-03-03 17:14:51 -080096 if (netif_carrier_ok(dev))
97 p->path_cost = port_cost(dev);
Stephen Hemminger4433f422005-12-20 15:19:51 -080098
Stephen Hemminger6e86b892006-03-03 17:14:51 -080099 if (br->dev->flags & IFF_UP) {
100 spin_lock_bh(&br->lock);
101 if (netif_carrier_ok(dev)) {
102 if (p->state == BR_STATE_DISABLED)
103 br_stp_enable_port(p);
104 } else {
105 if (p->state != BR_STATE_DISABLED)
106 br_stp_disable_port(p);
Stephen Hemminger4433f422005-12-20 15:19:51 -0800107 }
Stephen Hemminger6e86b892006-03-03 17:14:51 -0800108 spin_unlock_bh(&br->lock);
Stephen Hemminger4433f422005-12-20 15:19:51 -0800109 }
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -0800110done:
Jarek Poplawskia10d5672007-02-13 12:35:26 -0800111 dev_put(dev);
Stephen Hemminger4433f422005-12-20 15:19:51 -0800112 rtnl_unlock();
113}
114
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800115static void release_nbp(struct kobject *kobj)
116{
117 struct net_bridge_port *p
118 = container_of(kobj, struct net_bridge_port, kobj);
119 kfree(p);
120}
121
122static struct kobj_type brport_ktype = {
123#ifdef CONFIG_SYSFS
124 .sysfs_ops = &brport_sysfs_ops,
125#endif
126 .release = release_nbp,
127};
128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129static void destroy_nbp(struct net_bridge_port *p)
130{
131 struct net_device *dev = p->dev;
132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 p->br = NULL;
134 p->dev = NULL;
135 dev_put(dev);
136
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800137 kobject_put(&p->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138}
139
140static void destroy_nbp_rcu(struct rcu_head *head)
141{
142 struct net_bridge_port *p =
143 container_of(head, struct net_bridge_port, rcu);
144 destroy_nbp(p);
145}
146
Stephen Hemminger3f4cfc22006-01-31 17:44:07 -0800147/* Delete port(interface) from bridge is done in two steps.
148 * via RCU. First step, marks device as down. That deletes
149 * all the timers and stops new packets from flowing through.
150 *
151 * Final cleanup doesn't occur until after all CPU's finished
152 * processing packets.
153 *
154 * Protected from multiple admin operations by RTNL mutex
155 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156static void del_nbp(struct net_bridge_port *p)
157{
158 struct net_bridge *br = p->br;
159 struct net_device *dev = p->dev;
160
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800161 sysfs_remove_link(&br->ifobj, dev->name);
162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 dev_set_promiscuity(dev, -1);
164
Jarek Poplawskia10d5672007-02-13 12:35:26 -0800165 if (cancel_delayed_work(&p->carrier_check))
166 dev_put(dev);
Stephen Hemminger4433f422005-12-20 15:19:51 -0800167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 spin_lock_bh(&br->lock);
169 br_stp_disable_port(p);
170 spin_unlock_bh(&br->lock);
171
Stephen Hemminger1a620692006-10-12 14:45:38 -0700172 br_fdb_delete_by_port(br, p, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
174 list_del_rcu(&p->list);
175
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -0800176 rcu_assign_pointer(dev->br_port, NULL);
177
Stephen Hemminger125a12c2006-03-03 17:16:15 -0800178 kobject_uevent(&p->kobj, KOBJ_REMOVE);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800179 kobject_del(&p->kobj);
180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 call_rcu(&p->rcu, destroy_nbp_rcu);
182}
183
184/* called with RTNL */
185static void del_br(struct net_bridge *br)
186{
187 struct net_bridge_port *p, *n;
188
189 list_for_each_entry_safe(p, n, &br->port_list, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 del_nbp(p);
191 }
192
193 del_timer_sync(&br->gc_timer);
194
195 br_sysfs_delbr(br->dev);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900196 unregister_netdevice(br->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197}
198
199static struct net_device *new_bridge_dev(const char *name)
200{
201 struct net_bridge *br;
202 struct net_device *dev;
203
204 dev = alloc_netdev(sizeof(struct net_bridge), name,
205 br_dev_setup);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 if (!dev)
208 return NULL;
209
210 br = netdev_priv(dev);
211 br->dev = dev;
212
213 spin_lock_init(&br->lock);
214 INIT_LIST_HEAD(&br->port_list);
215 spin_lock_init(&br->hash_lock);
216
217 br->bridge_id.prio[0] = 0x80;
218 br->bridge_id.prio[1] = 0x00;
Stephen Hemmingercee48542006-03-20 22:57:03 -0800219
220 memcpy(br->group_addr, br_group_address, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800222 br->feature_mask = dev->features;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 br->stp_enabled = 0;
224 br->designated_root = br->bridge_id;
225 br->root_path_cost = 0;
226 br->root_port = 0;
227 br->bridge_max_age = br->max_age = 20 * HZ;
228 br->bridge_hello_time = br->hello_time = 2 * HZ;
229 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
230 br->topology_change = 0;
231 br->topology_change_detected = 0;
232 br->ageing_time = 300 * HZ;
233 INIT_LIST_HEAD(&br->age_list);
234
235 br_stp_timer_init(br);
236
237 return dev;
238}
239
240/* find an available port number */
241static int find_portno(struct net_bridge *br)
242{
243 int index;
244 struct net_bridge_port *p;
245 unsigned long *inuse;
246
Stephen Hemminger3b781fa2006-03-20 22:56:50 -0800247 inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 GFP_KERNEL);
249 if (!inuse)
250 return -ENOMEM;
251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 set_bit(0, inuse); /* zero is reserved */
253 list_for_each_entry(p, &br->port_list, list) {
254 set_bit(p->port_no, inuse);
255 }
256 index = find_first_zero_bit(inuse, BR_MAX_PORTS);
257 kfree(inuse);
258
259 return (index >= BR_MAX_PORTS) ? -EXFULL : index;
260}
261
Stephen Hemminger4433f422005-12-20 15:19:51 -0800262/* called with RTNL but without bridge lock */
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900263static struct net_bridge_port *new_nbp(struct net_bridge *br,
Stephen Hemminger4433f422005-12-20 15:19:51 -0800264 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265{
266 int index;
267 struct net_bridge_port *p;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900268
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 index = find_portno(br);
270 if (index < 0)
271 return ERR_PTR(index);
272
Stephen Hemmingercee48542006-03-20 22:57:03 -0800273 p = kzalloc(sizeof(*p), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 if (p == NULL)
275 return ERR_PTR(-ENOMEM);
276
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 p->br = br;
278 dev_hold(dev);
279 p->dev = dev;
Stephen Hemminger4433f422005-12-20 15:19:51 -0800280 p->path_cost = port_cost(dev);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900281 p->priority = 0x8000 >> BR_PORT_BITS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 p->port_no = index;
283 br_init_port(p);
284 p->state = BR_STATE_DISABLED;
David Howellsc4028952006-11-22 14:57:56 +0000285 INIT_DELAYED_WORK_NAR(&p->carrier_check, port_carrier_check);
Stephen Hemmingerd32439c2006-03-03 17:15:34 -0800286 br_stp_port_timer_init(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
Stephen Hemmingerd32439c2006-03-03 17:15:34 -0800288 kobject_init(&p->kobj);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800289 kobject_set_name(&p->kobj, SYSFS_BRIDGE_PORT_ATTR);
290 p->kobj.ktype = &brport_ktype;
Greg Kroah-Hartman43cb76d2002-04-09 12:14:34 -0700291 p->kobj.parent = &(dev->dev.kobj);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800292 p->kobj.kset = NULL;
293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 return p;
295}
296
297int br_add_bridge(const char *name)
298{
299 struct net_device *dev;
300 int ret;
301
302 dev = new_bridge_dev(name);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900303 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 return -ENOMEM;
305
306 rtnl_lock();
307 if (strchr(dev->name, '%')) {
308 ret = dev_alloc_name(dev, dev->name);
Jiri Benc36485702006-06-05 16:39:34 -0700309 if (ret < 0) {
310 free_netdev(dev);
311 goto out;
312 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 }
314
315 ret = register_netdevice(dev);
316 if (ret)
Jiri Benc36485702006-06-05 16:39:34 -0700317 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 ret = br_sysfs_addbr(dev);
Stephen Hemmingerac052022006-05-10 13:21:53 -0700320 if (ret)
Jiri Benc36485702006-06-05 16:39:34 -0700321 unregister_netdevice(dev);
322 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 rtnl_unlock();
Stephen Hemmingerac052022006-05-10 13:21:53 -0700324 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325}
326
327int br_del_bridge(const char *name)
328{
329 struct net_device *dev;
330 int ret = 0;
331
332 rtnl_lock();
333 dev = __dev_get_by_name(name);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900334 if (dev == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 ret = -ENXIO; /* Could not find device */
336
337 else if (!(dev->priv_flags & IFF_EBRIDGE)) {
338 /* Attempt to delete non bridge device! */
339 ret = -EPERM;
340 }
341
342 else if (dev->flags & IFF_UP) {
343 /* Not shutdown yet. */
344 ret = -EBUSY;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900345 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900347 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 del_br(netdev_priv(dev));
349
350 rtnl_unlock();
351 return ret;
352}
353
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800354/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355int br_min_mtu(const struct net_bridge *br)
356{
357 const struct net_bridge_port *p;
358 int mtu = 0;
359
360 ASSERT_RTNL();
361
362 if (list_empty(&br->port_list))
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800363 mtu = ETH_DATA_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 else {
365 list_for_each_entry(p, &br->port_list, list) {
366 if (!mtu || p->dev->mtu < mtu)
367 mtu = p->dev->mtu;
368 }
369 }
370 return mtu;
371}
372
Stephen Hemminger81d35302005-05-29 14:15:17 -0700373/*
374 * Recomputes features using slave's features
375 */
376void br_features_recompute(struct net_bridge *br)
377{
378 struct net_bridge_port *p;
379 unsigned long features, checksum;
380
Herbert Xu2c6cc0d2006-06-17 22:06:45 -0700381 checksum = br->feature_mask & NETIF_F_ALL_CSUM ? NETIF_F_NO_CSUM : 0;
382 features = br->feature_mask & ~NETIF_F_ALL_CSUM;
Stephen Hemminger81d35302005-05-29 14:15:17 -0700383
384 list_for_each_entry(p, &br->port_list, list) {
Herbert Xu37c31852006-06-22 03:07:29 -0700385 unsigned long feature = p->dev->features;
386
387 if (checksum & NETIF_F_NO_CSUM && !(feature & NETIF_F_NO_CSUM))
Herbert Xu2c6cc0d2006-06-17 22:06:45 -0700388 checksum ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;
Herbert Xu37c31852006-06-22 03:07:29 -0700389 if (checksum & NETIF_F_HW_CSUM && !(feature & NETIF_F_HW_CSUM))
Herbert Xu2c6cc0d2006-06-17 22:06:45 -0700390 checksum ^= NETIF_F_HW_CSUM | NETIF_F_IP_CSUM;
Herbert Xu37c31852006-06-22 03:07:29 -0700391 if (!(feature & NETIF_F_IP_CSUM))
Stephen Hemminger81d35302005-05-29 14:15:17 -0700392 checksum = 0;
Herbert Xu37c31852006-06-22 03:07:29 -0700393
394 if (feature & NETIF_F_GSO)
Herbert Xu78eb8872006-08-17 18:22:32 -0700395 feature |= NETIF_F_GSO_SOFTWARE;
Herbert Xu37c31852006-06-22 03:07:29 -0700396 feature |= NETIF_F_GSO;
397
398 features &= feature;
Stephen Hemminger81d35302005-05-29 14:15:17 -0700399 }
400
Herbert Xu78eb8872006-08-17 18:22:32 -0700401 if (!(checksum & NETIF_F_ALL_CSUM))
402 features &= ~NETIF_F_SG;
403 if (!(features & NETIF_F_SG))
404 features &= ~NETIF_F_GSO_MASK;
405
Herbert Xu576a30e2006-06-27 13:22:38 -0700406 br->dev->features = features | checksum | NETIF_F_LLTX |
407 NETIF_F_GSO_ROBUST;
Stephen Hemminger81d35302005-05-29 14:15:17 -0700408}
409
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410/* called with RTNL */
411int br_add_if(struct net_bridge *br, struct net_device *dev)
412{
413 struct net_bridge_port *p;
414 int err = 0;
415
416 if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER)
417 return -EINVAL;
418
419 if (dev->hard_start_xmit == br_dev_xmit)
420 return -ELOOP;
421
422 if (dev->br_port != NULL)
423 return -EBUSY;
424
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800425 p = new_nbp(br, dev);
426 if (IS_ERR(p))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 return PTR_ERR(p);
428
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800429 err = kobject_add(&p->kobj);
430 if (err)
431 goto err0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900433 err = br_fdb_insert(br, p, dev->dev_addr);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800434 if (err)
435 goto err1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800437 err = br_sysfs_addif(p);
438 if (err)
439 goto err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800441 rcu_assign_pointer(dev->br_port, p);
442 dev_set_promiscuity(dev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800444 list_add_rcu(&p->list, &br->port_list);
445
446 spin_lock_bh(&br->lock);
447 br_stp_recalculate_bridge_id(br);
448 br_features_recompute(br);
Jarek Poplawskia10d5672007-02-13 12:35:26 -0800449 if (schedule_delayed_work(&p->carrier_check, BR_PORT_DEBOUNCE))
450 dev_hold(dev);
451
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800452 spin_unlock_bh(&br->lock);
453
454 dev_set_mtu(br->dev, br_min_mtu(br));
455 kobject_uevent(&p->kobj, KOBJ_ADD);
456
457 return 0;
458err2:
Stephen Hemminger1a620692006-10-12 14:45:38 -0700459 br_fdb_delete_by_port(br, p, 1);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800460err1:
461 kobject_del(&p->kobj);
462err0:
463 kobject_put(&p->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 return err;
465}
466
467/* called with RTNL */
468int br_del_if(struct net_bridge *br, struct net_device *dev)
469{
470 struct net_bridge_port *p = dev->br_port;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900471
472 if (!p || p->br != br)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 return -EINVAL;
474
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 del_nbp(p);
476
477 spin_lock_bh(&br->lock);
478 br_stp_recalculate_bridge_id(br);
Stephen Hemminger81d35302005-05-29 14:15:17 -0700479 br_features_recompute(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 spin_unlock_bh(&br->lock);
481
482 return 0;
483}
484
485void __exit br_cleanup_bridges(void)
486{
487 struct net_device *dev, *nxt;
488
489 rtnl_lock();
490 for (dev = dev_base; dev; dev = nxt) {
491 nxt = dev->next;
492 if (dev->priv_flags & IFF_EBRIDGE)
493 del_br(dev->priv);
494 }
495 rtnl_unlock();
496
497}