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Commit | Line | Data |
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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); | |
9d6f229f | 50 | |
1da177e4 LT |
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 | */ | |
269def7c | 80 | void br_port_carrier_check(struct net_bridge_port *p) |
4433f420 | 81 | { |
269def7c SH |
82 | struct net_device *dev = p->dev; |
83 | struct net_bridge *br = p->br; | |
6e86b890 SH |
84 | |
85 | if (netif_carrier_ok(dev)) | |
86 | p->path_cost = port_cost(dev); | |
87 | ||
269def7c | 88 | if (netif_running(br->dev)) { |
6e86b890 SH |
89 | spin_lock_bh(&br->lock); |
90 | if (netif_carrier_ok(dev)) { | |
91 | if (p->state == BR_STATE_DISABLED) | |
92 | br_stp_enable_port(p); | |
93 | } else { | |
94 | if (p->state != BR_STATE_DISABLED) | |
95 | br_stp_disable_port(p); | |
4433f420 | 96 | } |
6e86b890 | 97 | spin_unlock_bh(&br->lock); |
4433f420 | 98 | } |
4433f420 SH |
99 | } |
100 | ||
bab1deea SH |
101 | static void release_nbp(struct kobject *kobj) |
102 | { | |
103 | struct net_bridge_port *p | |
104 | = container_of(kobj, struct net_bridge_port, kobj); | |
105 | kfree(p); | |
106 | } | |
107 | ||
108 | static struct kobj_type brport_ktype = { | |
109 | #ifdef CONFIG_SYSFS | |
110 | .sysfs_ops = &brport_sysfs_ops, | |
111 | #endif | |
112 | .release = release_nbp, | |
113 | }; | |
114 | ||
1da177e4 LT |
115 | static void destroy_nbp(struct net_bridge_port *p) |
116 | { | |
117 | struct net_device *dev = p->dev; | |
118 | ||
1da177e4 LT |
119 | p->br = NULL; |
120 | p->dev = NULL; | |
121 | dev_put(dev); | |
122 | ||
bab1deea | 123 | kobject_put(&p->kobj); |
1da177e4 LT |
124 | } |
125 | ||
126 | static void destroy_nbp_rcu(struct rcu_head *head) | |
127 | { | |
128 | struct net_bridge_port *p = | |
129 | container_of(head, struct net_bridge_port, rcu); | |
130 | destroy_nbp(p); | |
131 | } | |
132 | ||
3f4cfc2d SH |
133 | /* Delete port(interface) from bridge is done in two steps. |
134 | * via RCU. First step, marks device as down. That deletes | |
135 | * all the timers and stops new packets from flowing through. | |
136 | * | |
137 | * Final cleanup doesn't occur until after all CPU's finished | |
138 | * processing packets. | |
139 | * | |
140 | * Protected from multiple admin operations by RTNL mutex | |
141 | */ | |
1da177e4 LT |
142 | static void del_nbp(struct net_bridge_port *p) |
143 | { | |
144 | struct net_bridge *br = p->br; | |
145 | struct net_device *dev = p->dev; | |
146 | ||
bab1deea SH |
147 | sysfs_remove_link(&br->ifobj, dev->name); |
148 | ||
1da177e4 LT |
149 | dev_set_promiscuity(dev, -1); |
150 | ||
151 | spin_lock_bh(&br->lock); | |
152 | br_stp_disable_port(p); | |
153 | spin_unlock_bh(&br->lock); | |
154 | ||
b86c4503 SH |
155 | br_ifinfo_notify(RTM_DELLINK, p); |
156 | ||
1a620698 | 157 | br_fdb_delete_by_port(br, p, 1); |
1da177e4 LT |
158 | |
159 | list_del_rcu(&p->list); | |
160 | ||
b3f1be4b SH |
161 | rcu_assign_pointer(dev->br_port, NULL); |
162 | ||
125a12cc | 163 | kobject_uevent(&p->kobj, KOBJ_REMOVE); |
bab1deea SH |
164 | kobject_del(&p->kobj); |
165 | ||
1da177e4 LT |
166 | call_rcu(&p->rcu, destroy_nbp_rcu); |
167 | } | |
168 | ||
169 | /* called with RTNL */ | |
170 | static void del_br(struct net_bridge *br) | |
171 | { | |
172 | struct net_bridge_port *p, *n; | |
173 | ||
174 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
1da177e4 LT |
175 | del_nbp(p); |
176 | } | |
177 | ||
178 | del_timer_sync(&br->gc_timer); | |
179 | ||
180 | br_sysfs_delbr(br->dev); | |
9d6f229f | 181 | unregister_netdevice(br->dev); |
1da177e4 LT |
182 | } |
183 | ||
184 | static struct net_device *new_bridge_dev(const char *name) | |
185 | { | |
186 | struct net_bridge *br; | |
187 | struct net_device *dev; | |
188 | ||
189 | dev = alloc_netdev(sizeof(struct net_bridge), name, | |
190 | br_dev_setup); | |
9d6f229f | 191 | |
1da177e4 LT |
192 | if (!dev) |
193 | return NULL; | |
194 | ||
195 | br = netdev_priv(dev); | |
196 | br->dev = dev; | |
197 | ||
198 | spin_lock_init(&br->lock); | |
199 | INIT_LIST_HEAD(&br->port_list); | |
200 | spin_lock_init(&br->hash_lock); | |
201 | ||
202 | br->bridge_id.prio[0] = 0x80; | |
203 | br->bridge_id.prio[1] = 0x00; | |
cee48541 SH |
204 | |
205 | memcpy(br->group_addr, br_group_address, ETH_ALEN); | |
1da177e4 | 206 | |
edb5e46f | 207 | br->feature_mask = dev->features; |
9cde0708 | 208 | br->stp_enabled = BR_NO_STP; |
1da177e4 LT |
209 | br->designated_root = br->bridge_id; |
210 | br->root_path_cost = 0; | |
211 | br->root_port = 0; | |
212 | br->bridge_max_age = br->max_age = 20 * HZ; | |
213 | br->bridge_hello_time = br->hello_time = 2 * HZ; | |
214 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; | |
215 | br->topology_change = 0; | |
216 | br->topology_change_detected = 0; | |
217 | br->ageing_time = 300 * HZ; | |
218 | INIT_LIST_HEAD(&br->age_list); | |
219 | ||
220 | br_stp_timer_init(br); | |
221 | ||
222 | return dev; | |
223 | } | |
224 | ||
225 | /* find an available port number */ | |
226 | static int find_portno(struct net_bridge *br) | |
227 | { | |
228 | int index; | |
229 | struct net_bridge_port *p; | |
230 | unsigned long *inuse; | |
231 | ||
3b781fa1 | 232 | inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long), |
1da177e4 LT |
233 | GFP_KERNEL); |
234 | if (!inuse) | |
235 | return -ENOMEM; | |
236 | ||
1da177e4 LT |
237 | set_bit(0, inuse); /* zero is reserved */ |
238 | list_for_each_entry(p, &br->port_list, list) { | |
239 | set_bit(p->port_no, inuse); | |
240 | } | |
241 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); | |
242 | kfree(inuse); | |
243 | ||
244 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; | |
245 | } | |
246 | ||
4433f420 | 247 | /* called with RTNL but without bridge lock */ |
9d6f229f | 248 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
4433f420 | 249 | struct net_device *dev) |
1da177e4 LT |
250 | { |
251 | int index; | |
252 | struct net_bridge_port *p; | |
9d6f229f | 253 | |
1da177e4 LT |
254 | index = find_portno(br); |
255 | if (index < 0) | |
256 | return ERR_PTR(index); | |
257 | ||
cee48541 | 258 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 LT |
259 | if (p == NULL) |
260 | return ERR_PTR(-ENOMEM); | |
261 | ||
1da177e4 LT |
262 | p->br = br; |
263 | dev_hold(dev); | |
264 | p->dev = dev; | |
4433f420 | 265 | p->path_cost = port_cost(dev); |
9d6f229f | 266 | p->priority = 0x8000 >> BR_PORT_BITS; |
1da177e4 LT |
267 | p->port_no = index; |
268 | br_init_port(p); | |
269 | p->state = BR_STATE_DISABLED; | |
d32439c0 | 270 | br_stp_port_timer_init(p); |
1da177e4 | 271 | |
d32439c0 | 272 | kobject_init(&p->kobj); |
bab1deea SH |
273 | kobject_set_name(&p->kobj, SYSFS_BRIDGE_PORT_ATTR); |
274 | p->kobj.ktype = &brport_ktype; | |
43cb76d9 | 275 | p->kobj.parent = &(dev->dev.kobj); |
bab1deea SH |
276 | p->kobj.kset = NULL; |
277 | ||
1da177e4 LT |
278 | return p; |
279 | } | |
280 | ||
281 | int br_add_bridge(const char *name) | |
282 | { | |
283 | struct net_device *dev; | |
284 | int ret; | |
285 | ||
286 | dev = new_bridge_dev(name); | |
9d6f229f | 287 | if (!dev) |
1da177e4 LT |
288 | return -ENOMEM; |
289 | ||
290 | rtnl_lock(); | |
291 | if (strchr(dev->name, '%')) { | |
292 | ret = dev_alloc_name(dev, dev->name); | |
36485707 JB |
293 | if (ret < 0) { |
294 | free_netdev(dev); | |
295 | goto out; | |
296 | } | |
1da177e4 LT |
297 | } |
298 | ||
299 | ret = register_netdevice(dev); | |
300 | if (ret) | |
36485707 | 301 | goto out; |
1da177e4 | 302 | |
1da177e4 | 303 | ret = br_sysfs_addbr(dev); |
ac05202e | 304 | if (ret) |
36485707 JB |
305 | unregister_netdevice(dev); |
306 | out: | |
1da177e4 | 307 | rtnl_unlock(); |
ac05202e | 308 | return ret; |
1da177e4 LT |
309 | } |
310 | ||
311 | int br_del_bridge(const char *name) | |
312 | { | |
313 | struct net_device *dev; | |
314 | int ret = 0; | |
315 | ||
316 | rtnl_lock(); | |
317 | dev = __dev_get_by_name(name); | |
9d6f229f | 318 | if (dev == NULL) |
1da177e4 LT |
319 | ret = -ENXIO; /* Could not find device */ |
320 | ||
321 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
322 | /* Attempt to delete non bridge device! */ | |
323 | ret = -EPERM; | |
324 | } | |
325 | ||
326 | else if (dev->flags & IFF_UP) { | |
327 | /* Not shutdown yet. */ | |
328 | ret = -EBUSY; | |
9d6f229f | 329 | } |
1da177e4 | 330 | |
9d6f229f | 331 | else |
1da177e4 LT |
332 | del_br(netdev_priv(dev)); |
333 | ||
334 | rtnl_unlock(); | |
335 | return ret; | |
336 | } | |
337 | ||
46f25dff | 338 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
1da177e4 LT |
339 | int br_min_mtu(const struct net_bridge *br) |
340 | { | |
341 | const struct net_bridge_port *p; | |
342 | int mtu = 0; | |
343 | ||
344 | ASSERT_RTNL(); | |
345 | ||
346 | if (list_empty(&br->port_list)) | |
46f25dff | 347 | mtu = ETH_DATA_LEN; |
1da177e4 LT |
348 | else { |
349 | list_for_each_entry(p, &br->port_list, list) { | |
350 | if (!mtu || p->dev->mtu < mtu) | |
351 | mtu = p->dev->mtu; | |
352 | } | |
353 | } | |
354 | return mtu; | |
355 | } | |
356 | ||
81d35307 SH |
357 | /* |
358 | * Recomputes features using slave's features | |
359 | */ | |
360 | void br_features_recompute(struct net_bridge *br) | |
361 | { | |
362 | struct net_bridge_port *p; | |
363 | unsigned long features, checksum; | |
364 | ||
2c6cc0d8 HX |
365 | checksum = br->feature_mask & NETIF_F_ALL_CSUM ? NETIF_F_NO_CSUM : 0; |
366 | features = br->feature_mask & ~NETIF_F_ALL_CSUM; | |
81d35307 SH |
367 | |
368 | list_for_each_entry(p, &br->port_list, list) { | |
37c3185a HX |
369 | unsigned long feature = p->dev->features; |
370 | ||
d212f87b | 371 | /* if device needs checksumming, downgrade to hw checksumming */ |
37c3185a | 372 | if (checksum & NETIF_F_NO_CSUM && !(feature & NETIF_F_NO_CSUM)) |
2c6cc0d8 | 373 | checksum ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM; |
d212f87b SH |
374 | |
375 | /* if device can't do all checksum, downgrade to ipv4/ipv6 */ | |
37c3185a | 376 | if (checksum & NETIF_F_HW_CSUM && !(feature & NETIF_F_HW_CSUM)) |
d212f87b SH |
377 | checksum ^= NETIF_F_HW_CSUM |
378 | | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; | |
379 | ||
380 | if (checksum & NETIF_F_IPV6_CSUM && !(feature & NETIF_F_IPV6_CSUM)) | |
381 | checksum &= ~NETIF_F_IPV6_CSUM; | |
382 | ||
37c3185a | 383 | if (!(feature & NETIF_F_IP_CSUM)) |
81d35307 | 384 | checksum = 0; |
37c3185a HX |
385 | |
386 | if (feature & NETIF_F_GSO) | |
78eb8877 | 387 | feature |= NETIF_F_GSO_SOFTWARE; |
37c3185a HX |
388 | feature |= NETIF_F_GSO; |
389 | ||
390 | features &= feature; | |
81d35307 SH |
391 | } |
392 | ||
78eb8877 HX |
393 | if (!(checksum & NETIF_F_ALL_CSUM)) |
394 | features &= ~NETIF_F_SG; | |
395 | if (!(features & NETIF_F_SG)) | |
396 | features &= ~NETIF_F_GSO_MASK; | |
397 | ||
576a30eb HX |
398 | br->dev->features = features | checksum | NETIF_F_LLTX | |
399 | NETIF_F_GSO_ROBUST; | |
81d35307 SH |
400 | } |
401 | ||
1da177e4 LT |
402 | /* called with RTNL */ |
403 | int br_add_if(struct net_bridge *br, struct net_device *dev) | |
404 | { | |
405 | struct net_bridge_port *p; | |
406 | int err = 0; | |
407 | ||
408 | if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER) | |
409 | return -EINVAL; | |
410 | ||
411 | if (dev->hard_start_xmit == br_dev_xmit) | |
412 | return -ELOOP; | |
413 | ||
414 | if (dev->br_port != NULL) | |
415 | return -EBUSY; | |
416 | ||
bab1deea SH |
417 | p = new_nbp(br, dev); |
418 | if (IS_ERR(p)) | |
1da177e4 LT |
419 | return PTR_ERR(p); |
420 | ||
bab1deea SH |
421 | err = kobject_add(&p->kobj); |
422 | if (err) | |
423 | goto err0; | |
1da177e4 | 424 | |
9d6f229f | 425 | err = br_fdb_insert(br, p, dev->dev_addr); |
bab1deea SH |
426 | if (err) |
427 | goto err1; | |
1da177e4 | 428 | |
bab1deea SH |
429 | err = br_sysfs_addif(p); |
430 | if (err) | |
431 | goto err2; | |
1da177e4 | 432 | |
bab1deea SH |
433 | rcu_assign_pointer(dev->br_port, p); |
434 | dev_set_promiscuity(dev, 1); | |
435 | ||
436 | list_add_rcu(&p->list, &br->port_list); | |
437 | ||
438 | spin_lock_bh(&br->lock); | |
439 | br_stp_recalculate_bridge_id(br); | |
440 | br_features_recompute(br); | |
de79059e AS |
441 | |
442 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) && | |
443 | (br->dev->flags & IFF_UP)) | |
444 | br_stp_enable_port(p); | |
bab1deea SH |
445 | spin_unlock_bh(&br->lock); |
446 | ||
b86c4503 SH |
447 | br_ifinfo_notify(RTM_NEWLINK, p); |
448 | ||
bab1deea | 449 | dev_set_mtu(br->dev, br_min_mtu(br)); |
269def7c | 450 | |
bab1deea | 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; | |
9d6f229f YH |
467 | |
468 | if (!p || p->br != br) | |
1da177e4 LT |
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(); | |
7562f876 | 486 | for_each_netdev_safe(dev, nxt) |
1da177e4 LT |
487 | if (dev->priv_flags & IFF_EBRIDGE) |
488 | del_br(dev->priv); | |
1da177e4 LT |
489 | rtnl_unlock(); |
490 | ||
491 | } |