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 | */ | |
c4028958 | 80 | static void port_carrier_check(struct work_struct *work) |
4433f420 | 81 | { |
b3f1be4b | 82 | struct net_bridge_port *p; |
c4028958 | 83 | struct net_device *dev; |
6e86b890 | 84 | struct net_bridge *br; |
4433f420 | 85 | |
c4028958 DH |
86 | dev = container_of(work, struct net_bridge_port, |
87 | carrier_check.work)->dev; | |
88 | work_release(work); | |
89 | ||
4433f420 | 90 | rtnl_lock(); |
b3f1be4b SH |
91 | p = dev->br_port; |
92 | if (!p) | |
93 | goto done; | |
6e86b890 SH |
94 | br = p->br; |
95 | ||
96 | if (netif_carrier_ok(dev)) | |
97 | p->path_cost = port_cost(dev); | |
98 | ||
99 | 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); | |
4433f420 | 107 | } |
6e86b890 | 108 | spin_unlock_bh(&br->lock); |
4433f420 | 109 | } |
b3f1be4b | 110 | done: |
4433f420 SH |
111 | rtnl_unlock(); |
112 | } | |
113 | ||
bab1deea SH |
114 | static void release_nbp(struct kobject *kobj) |
115 | { | |
116 | struct net_bridge_port *p | |
117 | = container_of(kobj, struct net_bridge_port, kobj); | |
118 | kfree(p); | |
119 | } | |
120 | ||
121 | static struct kobj_type brport_ktype = { | |
122 | #ifdef CONFIG_SYSFS | |
123 | .sysfs_ops = &brport_sysfs_ops, | |
124 | #endif | |
125 | .release = release_nbp, | |
126 | }; | |
127 | ||
1da177e4 LT |
128 | static void destroy_nbp(struct net_bridge_port *p) |
129 | { | |
130 | struct net_device *dev = p->dev; | |
131 | ||
1da177e4 LT |
132 | p->br = NULL; |
133 | p->dev = NULL; | |
134 | dev_put(dev); | |
135 | ||
bab1deea | 136 | kobject_put(&p->kobj); |
1da177e4 LT |
137 | } |
138 | ||
139 | static void destroy_nbp_rcu(struct rcu_head *head) | |
140 | { | |
141 | struct net_bridge_port *p = | |
142 | container_of(head, struct net_bridge_port, rcu); | |
143 | destroy_nbp(p); | |
144 | } | |
145 | ||
3f4cfc2d SH |
146 | /* Delete port(interface) from bridge is done in two steps. |
147 | * via RCU. First step, marks device as down. That deletes | |
148 | * all the timers and stops new packets from flowing through. | |
149 | * | |
150 | * Final cleanup doesn't occur until after all CPU's finished | |
151 | * processing packets. | |
152 | * | |
153 | * Protected from multiple admin operations by RTNL mutex | |
154 | */ | |
1da177e4 LT |
155 | static void del_nbp(struct net_bridge_port *p) |
156 | { | |
157 | struct net_bridge *br = p->br; | |
158 | struct net_device *dev = p->dev; | |
159 | ||
bab1deea SH |
160 | sysfs_remove_link(&br->ifobj, dev->name); |
161 | ||
1da177e4 LT |
162 | dev_set_promiscuity(dev, -1); |
163 | ||
4433f420 | 164 | cancel_delayed_work(&p->carrier_check); |
4433f420 | 165 | |
1da177e4 LT |
166 | spin_lock_bh(&br->lock); |
167 | br_stp_disable_port(p); | |
168 | spin_unlock_bh(&br->lock); | |
169 | ||
1a620698 | 170 | br_fdb_delete_by_port(br, p, 1); |
1da177e4 LT |
171 | |
172 | list_del_rcu(&p->list); | |
173 | ||
b3f1be4b SH |
174 | rcu_assign_pointer(dev->br_port, NULL); |
175 | ||
125a12cc | 176 | kobject_uevent(&p->kobj, KOBJ_REMOVE); |
bab1deea SH |
177 | kobject_del(&p->kobj); |
178 | ||
1da177e4 LT |
179 | call_rcu(&p->rcu, destroy_nbp_rcu); |
180 | } | |
181 | ||
182 | /* called with RTNL */ | |
183 | static void del_br(struct net_bridge *br) | |
184 | { | |
185 | struct net_bridge_port *p, *n; | |
186 | ||
187 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
1da177e4 LT |
188 | del_nbp(p); |
189 | } | |
190 | ||
191 | del_timer_sync(&br->gc_timer); | |
192 | ||
193 | br_sysfs_delbr(br->dev); | |
194 | unregister_netdevice(br->dev); | |
195 | } | |
196 | ||
197 | static struct net_device *new_bridge_dev(const char *name) | |
198 | { | |
199 | struct net_bridge *br; | |
200 | struct net_device *dev; | |
201 | ||
202 | dev = alloc_netdev(sizeof(struct net_bridge), name, | |
203 | br_dev_setup); | |
204 | ||
205 | if (!dev) | |
206 | return NULL; | |
207 | ||
208 | br = netdev_priv(dev); | |
209 | br->dev = dev; | |
210 | ||
211 | spin_lock_init(&br->lock); | |
212 | INIT_LIST_HEAD(&br->port_list); | |
213 | spin_lock_init(&br->hash_lock); | |
214 | ||
215 | br->bridge_id.prio[0] = 0x80; | |
216 | br->bridge_id.prio[1] = 0x00; | |
cee48541 SH |
217 | |
218 | memcpy(br->group_addr, br_group_address, ETH_ALEN); | |
1da177e4 | 219 | |
edb5e46f | 220 | br->feature_mask = dev->features; |
1da177e4 LT |
221 | br->stp_enabled = 0; |
222 | br->designated_root = br->bridge_id; | |
223 | br->root_path_cost = 0; | |
224 | br->root_port = 0; | |
225 | br->bridge_max_age = br->max_age = 20 * HZ; | |
226 | br->bridge_hello_time = br->hello_time = 2 * HZ; | |
227 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; | |
228 | br->topology_change = 0; | |
229 | br->topology_change_detected = 0; | |
230 | br->ageing_time = 300 * HZ; | |
231 | INIT_LIST_HEAD(&br->age_list); | |
232 | ||
233 | br_stp_timer_init(br); | |
234 | ||
235 | return dev; | |
236 | } | |
237 | ||
238 | /* find an available port number */ | |
239 | static int find_portno(struct net_bridge *br) | |
240 | { | |
241 | int index; | |
242 | struct net_bridge_port *p; | |
243 | unsigned long *inuse; | |
244 | ||
3b781fa1 | 245 | inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long), |
1da177e4 LT |
246 | GFP_KERNEL); |
247 | if (!inuse) | |
248 | return -ENOMEM; | |
249 | ||
1da177e4 LT |
250 | set_bit(0, inuse); /* zero is reserved */ |
251 | list_for_each_entry(p, &br->port_list, list) { | |
252 | set_bit(p->port_no, inuse); | |
253 | } | |
254 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); | |
255 | kfree(inuse); | |
256 | ||
257 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; | |
258 | } | |
259 | ||
4433f420 | 260 | /* called with RTNL but without bridge lock */ |
1da177e4 | 261 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
4433f420 | 262 | struct net_device *dev) |
1da177e4 LT |
263 | { |
264 | int index; | |
265 | struct net_bridge_port *p; | |
266 | ||
267 | index = find_portno(br); | |
268 | if (index < 0) | |
269 | return ERR_PTR(index); | |
270 | ||
cee48541 | 271 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 LT |
272 | if (p == NULL) |
273 | return ERR_PTR(-ENOMEM); | |
274 | ||
1da177e4 LT |
275 | p->br = br; |
276 | dev_hold(dev); | |
277 | p->dev = dev; | |
4433f420 | 278 | p->path_cost = port_cost(dev); |
1da177e4 | 279 | p->priority = 0x8000 >> BR_PORT_BITS; |
1da177e4 LT |
280 | p->port_no = index; |
281 | br_init_port(p); | |
282 | p->state = BR_STATE_DISABLED; | |
c4028958 | 283 | INIT_DELAYED_WORK_NAR(&p->carrier_check, port_carrier_check); |
d32439c0 | 284 | br_stp_port_timer_init(p); |
1da177e4 | 285 | |
d32439c0 | 286 | kobject_init(&p->kobj); |
bab1deea SH |
287 | kobject_set_name(&p->kobj, SYSFS_BRIDGE_PORT_ATTR); |
288 | p->kobj.ktype = &brport_ktype; | |
289 | p->kobj.parent = &(dev->class_dev.kobj); | |
290 | p->kobj.kset = NULL; | |
291 | ||
1da177e4 LT |
292 | return p; |
293 | } | |
294 | ||
295 | int br_add_bridge(const char *name) | |
296 | { | |
297 | struct net_device *dev; | |
298 | int ret; | |
299 | ||
300 | dev = new_bridge_dev(name); | |
301 | if (!dev) | |
302 | return -ENOMEM; | |
303 | ||
304 | rtnl_lock(); | |
305 | if (strchr(dev->name, '%')) { | |
306 | ret = dev_alloc_name(dev, dev->name); | |
36485707 JB |
307 | if (ret < 0) { |
308 | free_netdev(dev); | |
309 | goto out; | |
310 | } | |
1da177e4 LT |
311 | } |
312 | ||
313 | ret = register_netdevice(dev); | |
314 | if (ret) | |
36485707 | 315 | goto out; |
1da177e4 | 316 | |
1da177e4 | 317 | ret = br_sysfs_addbr(dev); |
ac05202e | 318 | if (ret) |
36485707 JB |
319 | unregister_netdevice(dev); |
320 | out: | |
1da177e4 | 321 | rtnl_unlock(); |
ac05202e | 322 | return ret; |
1da177e4 LT |
323 | } |
324 | ||
325 | int br_del_bridge(const char *name) | |
326 | { | |
327 | struct net_device *dev; | |
328 | int ret = 0; | |
329 | ||
330 | rtnl_lock(); | |
331 | dev = __dev_get_by_name(name); | |
332 | if (dev == NULL) | |
333 | ret = -ENXIO; /* Could not find device */ | |
334 | ||
335 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
336 | /* Attempt to delete non bridge device! */ | |
337 | ret = -EPERM; | |
338 | } | |
339 | ||
340 | else if (dev->flags & IFF_UP) { | |
341 | /* Not shutdown yet. */ | |
342 | ret = -EBUSY; | |
343 | } | |
344 | ||
345 | else | |
346 | del_br(netdev_priv(dev)); | |
347 | ||
348 | rtnl_unlock(); | |
349 | return ret; | |
350 | } | |
351 | ||
46f25dff | 352 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
1da177e4 LT |
353 | int br_min_mtu(const struct net_bridge *br) |
354 | { | |
355 | const struct net_bridge_port *p; | |
356 | int mtu = 0; | |
357 | ||
358 | ASSERT_RTNL(); | |
359 | ||
360 | if (list_empty(&br->port_list)) | |
46f25dff | 361 | mtu = ETH_DATA_LEN; |
1da177e4 LT |
362 | else { |
363 | list_for_each_entry(p, &br->port_list, list) { | |
364 | if (!mtu || p->dev->mtu < mtu) | |
365 | mtu = p->dev->mtu; | |
366 | } | |
367 | } | |
368 | return mtu; | |
369 | } | |
370 | ||
81d35307 SH |
371 | /* |
372 | * Recomputes features using slave's features | |
373 | */ | |
374 | void br_features_recompute(struct net_bridge *br) | |
375 | { | |
376 | struct net_bridge_port *p; | |
377 | unsigned long features, checksum; | |
378 | ||
2c6cc0d8 HX |
379 | checksum = br->feature_mask & NETIF_F_ALL_CSUM ? NETIF_F_NO_CSUM : 0; |
380 | features = br->feature_mask & ~NETIF_F_ALL_CSUM; | |
81d35307 SH |
381 | |
382 | list_for_each_entry(p, &br->port_list, list) { | |
37c3185a HX |
383 | unsigned long feature = p->dev->features; |
384 | ||
385 | if (checksum & NETIF_F_NO_CSUM && !(feature & NETIF_F_NO_CSUM)) | |
2c6cc0d8 | 386 | checksum ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM; |
37c3185a | 387 | if (checksum & NETIF_F_HW_CSUM && !(feature & NETIF_F_HW_CSUM)) |
2c6cc0d8 | 388 | checksum ^= NETIF_F_HW_CSUM | NETIF_F_IP_CSUM; |
37c3185a | 389 | if (!(feature & NETIF_F_IP_CSUM)) |
81d35307 | 390 | checksum = 0; |
37c3185a HX |
391 | |
392 | if (feature & NETIF_F_GSO) | |
78eb8877 | 393 | feature |= NETIF_F_GSO_SOFTWARE; |
37c3185a HX |
394 | feature |= NETIF_F_GSO; |
395 | ||
396 | features &= feature; | |
81d35307 SH |
397 | } |
398 | ||
78eb8877 HX |
399 | if (!(checksum & NETIF_F_ALL_CSUM)) |
400 | features &= ~NETIF_F_SG; | |
401 | if (!(features & NETIF_F_SG)) | |
402 | features &= ~NETIF_F_GSO_MASK; | |
403 | ||
576a30eb HX |
404 | br->dev->features = features | checksum | NETIF_F_LLTX | |
405 | NETIF_F_GSO_ROBUST; | |
81d35307 SH |
406 | } |
407 | ||
1da177e4 LT |
408 | /* called with RTNL */ |
409 | int br_add_if(struct net_bridge *br, struct net_device *dev) | |
410 | { | |
411 | struct net_bridge_port *p; | |
412 | int err = 0; | |
413 | ||
414 | if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER) | |
415 | return -EINVAL; | |
416 | ||
417 | if (dev->hard_start_xmit == br_dev_xmit) | |
418 | return -ELOOP; | |
419 | ||
420 | if (dev->br_port != NULL) | |
421 | return -EBUSY; | |
422 | ||
bab1deea SH |
423 | p = new_nbp(br, dev); |
424 | if (IS_ERR(p)) | |
1da177e4 LT |
425 | return PTR_ERR(p); |
426 | ||
bab1deea SH |
427 | err = kobject_add(&p->kobj); |
428 | if (err) | |
429 | goto err0; | |
1da177e4 | 430 | |
bab1deea SH |
431 | err = br_fdb_insert(br, p, dev->dev_addr); |
432 | if (err) | |
433 | goto err1; | |
1da177e4 | 434 | |
bab1deea SH |
435 | err = br_sysfs_addif(p); |
436 | if (err) | |
437 | goto err2; | |
1da177e4 | 438 | |
bab1deea SH |
439 | rcu_assign_pointer(dev->br_port, p); |
440 | dev_set_promiscuity(dev, 1); | |
441 | ||
442 | list_add_rcu(&p->list, &br->port_list); | |
443 | ||
444 | spin_lock_bh(&br->lock); | |
445 | br_stp_recalculate_bridge_id(br); | |
446 | br_features_recompute(br); | |
447 | schedule_delayed_work(&p->carrier_check, BR_PORT_DEBOUNCE); | |
448 | spin_unlock_bh(&br->lock); | |
449 | ||
450 | dev_set_mtu(br->dev, br_min_mtu(br)); | |
451 | kobject_uevent(&p->kobj, KOBJ_ADD); | |
1da177e4 | 452 | |
bab1deea SH |
453 | return 0; |
454 | err2: | |
1a620698 | 455 | br_fdb_delete_by_port(br, p, 1); |
bab1deea SH |
456 | err1: |
457 | kobject_del(&p->kobj); | |
458 | err0: | |
459 | kobject_put(&p->kobj); | |
1da177e4 LT |
460 | return err; |
461 | } | |
462 | ||
463 | /* called with RTNL */ | |
464 | int br_del_if(struct net_bridge *br, struct net_device *dev) | |
465 | { | |
466 | struct net_bridge_port *p = dev->br_port; | |
467 | ||
468 | if (!p || p->br != br) | |
469 | return -EINVAL; | |
470 | ||
1da177e4 LT |
471 | del_nbp(p); |
472 | ||
473 | spin_lock_bh(&br->lock); | |
474 | br_stp_recalculate_bridge_id(br); | |
81d35307 | 475 | br_features_recompute(br); |
1da177e4 LT |
476 | spin_unlock_bh(&br->lock); |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
481 | void __exit br_cleanup_bridges(void) | |
482 | { | |
483 | struct net_device *dev, *nxt; | |
484 | ||
485 | rtnl_lock(); | |
486 | for (dev = dev_base; dev; dev = nxt) { | |
487 | nxt = dev->next; | |
488 | if (dev->priv_flags & IFF_EBRIDGE) | |
489 | del_br(dev->priv); | |
490 | } | |
491 | rtnl_unlock(); | |
492 | ||
493 | } |