Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Userspace interface | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * | |
1da177e4 LT |
8 | * 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> | |
77f98598 | 16 | #include <linux/etherdevice.h> |
c06ee961 | 17 | #include <linux/netpoll.h> |
1da177e4 LT |
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> |
5a0e3ad6 | 24 | #include <linux/slab.h> |
1da177e4 LT |
25 | #include <net/sock.h> |
26 | ||
27 | #include "br_private.h" | |
28 | ||
29 | /* | |
30 | * Determine initial path cost based on speed. | |
31 | * using recommendations from 802.1d standard | |
32 | * | |
61a44b9c | 33 | * Since driver might sleep need to not be holding any locks. |
1da177e4 | 34 | */ |
4433f420 | 35 | static int port_cost(struct net_device *dev) |
1da177e4 | 36 | { |
fa3df928 | 37 | struct ethtool_cmd ecmd; |
b4a488d1 | 38 | |
4bc71cb9 | 39 | if (!__ethtool_get_settings(dev, &ecmd)) { |
fa3df928 JP |
40 | switch (ethtool_cmd_speed(&ecmd)) { |
41 | case SPEED_10000: | |
42 | return 2; | |
43 | case SPEED_1000: | |
44 | return 4; | |
45 | case SPEED_100: | |
46 | return 19; | |
47 | case SPEED_10: | |
48 | return 100; | |
1da177e4 LT |
49 | } |
50 | } | |
51 | ||
52 | /* Old silly heuristics based on name */ | |
53 | if (!strncmp(dev->name, "lec", 3)) | |
54 | return 7; | |
55 | ||
56 | if (!strncmp(dev->name, "plip", 4)) | |
57 | return 2500; | |
58 | ||
59 | return 100; /* assume old 10Mbps */ | |
60 | } | |
61 | ||
4433f420 | 62 | |
944c794d | 63 | /* Check for port carrier transistions. */ |
269def7c | 64 | void br_port_carrier_check(struct net_bridge_port *p) |
4433f420 | 65 | { |
269def7c SH |
66 | struct net_device *dev = p->dev; |
67 | struct net_bridge *br = p->br; | |
6e86b890 | 68 | |
aa7c6e5f | 69 | if (netif_running(dev) && netif_carrier_ok(dev)) |
6e86b890 SH |
70 | p->path_cost = port_cost(dev); |
71 | ||
aa7c6e5f | 72 | if (!netif_running(br->dev)) |
73 | return; | |
74 | ||
75 | spin_lock_bh(&br->lock); | |
76 | if (netif_running(dev) && netif_carrier_ok(dev)) { | |
77 | if (p->state == BR_STATE_DISABLED) | |
78 | br_stp_enable_port(p); | |
79 | } else { | |
80 | if (p->state != BR_STATE_DISABLED) | |
81 | br_stp_disable_port(p); | |
4433f420 | 82 | } |
aa7c6e5f | 83 | spin_unlock_bh(&br->lock); |
4433f420 SH |
84 | } |
85 | ||
bab1deea SH |
86 | static void release_nbp(struct kobject *kobj) |
87 | { | |
88 | struct net_bridge_port *p | |
89 | = container_of(kobj, struct net_bridge_port, kobj); | |
90 | kfree(p); | |
91 | } | |
92 | ||
93 | static struct kobj_type brport_ktype = { | |
94 | #ifdef CONFIG_SYSFS | |
95 | .sysfs_ops = &brport_sysfs_ops, | |
96 | #endif | |
97 | .release = release_nbp, | |
98 | }; | |
99 | ||
1da177e4 LT |
100 | static void destroy_nbp(struct net_bridge_port *p) |
101 | { | |
102 | struct net_device *dev = p->dev; | |
103 | ||
1da177e4 LT |
104 | p->br = NULL; |
105 | p->dev = NULL; | |
106 | dev_put(dev); | |
107 | ||
bab1deea | 108 | kobject_put(&p->kobj); |
1da177e4 LT |
109 | } |
110 | ||
111 | static void destroy_nbp_rcu(struct rcu_head *head) | |
112 | { | |
113 | struct net_bridge_port *p = | |
114 | container_of(head, struct net_bridge_port, rcu); | |
115 | destroy_nbp(p); | |
116 | } | |
117 | ||
3f4cfc2d SH |
118 | /* Delete port(interface) from bridge is done in two steps. |
119 | * via RCU. First step, marks device as down. That deletes | |
120 | * all the timers and stops new packets from flowing through. | |
121 | * | |
122 | * Final cleanup doesn't occur until after all CPU's finished | |
123 | * processing packets. | |
124 | * | |
125 | * Protected from multiple admin operations by RTNL mutex | |
126 | */ | |
1da177e4 LT |
127 | static void del_nbp(struct net_bridge_port *p) |
128 | { | |
129 | struct net_bridge *br = p->br; | |
130 | struct net_device *dev = p->dev; | |
131 | ||
b3bcb72e | 132 | sysfs_remove_link(br->ifobj, p->dev->name); |
bab1deea | 133 | |
1da177e4 LT |
134 | dev_set_promiscuity(dev, -1); |
135 | ||
136 | spin_lock_bh(&br->lock); | |
137 | br_stp_disable_port(p); | |
138 | spin_unlock_bh(&br->lock); | |
139 | ||
b86c4503 SH |
140 | br_ifinfo_notify(RTM_DELLINK, p); |
141 | ||
1a620698 | 142 | br_fdb_delete_by_port(br, p, 1); |
1da177e4 LT |
143 | |
144 | list_del_rcu(&p->list); | |
145 | ||
f350a0a8 JP |
146 | dev->priv_flags &= ~IFF_BRIDGE_PORT; |
147 | ||
ab95bfe0 | 148 | netdev_rx_handler_unregister(dev); |
6df427fe | 149 | synchronize_net(); |
b3f1be4b | 150 | |
afc6151a JP |
151 | netdev_set_master(dev, NULL); |
152 | ||
3fe2d7c7 HX |
153 | br_multicast_del_port(p); |
154 | ||
125a12cc | 155 | kobject_uevent(&p->kobj, KOBJ_REMOVE); |
bab1deea SH |
156 | kobject_del(&p->kobj); |
157 | ||
91d2c34a HX |
158 | br_netpoll_disable(p); |
159 | ||
1da177e4 LT |
160 | call_rcu(&p->rcu, destroy_nbp_rcu); |
161 | } | |
162 | ||
1ce5cce8 | 163 | /* Delete bridge device */ |
164 | void br_dev_delete(struct net_device *dev, struct list_head *head) | |
1da177e4 | 165 | { |
1ce5cce8 | 166 | struct net_bridge *br = netdev_priv(dev); |
1da177e4 LT |
167 | struct net_bridge_port *p, *n; |
168 | ||
169 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
1da177e4 LT |
170 | del_nbp(p); |
171 | } | |
172 | ||
173 | del_timer_sync(&br->gc_timer); | |
174 | ||
175 | br_sysfs_delbr(br->dev); | |
8c56ba05 | 176 | unregister_netdevice_queue(br->dev, head); |
1da177e4 LT |
177 | } |
178 | ||
1da177e4 LT |
179 | /* find an available port number */ |
180 | static int find_portno(struct net_bridge *br) | |
181 | { | |
182 | int index; | |
183 | struct net_bridge_port *p; | |
184 | unsigned long *inuse; | |
185 | ||
3b781fa1 | 186 | inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long), |
1da177e4 LT |
187 | GFP_KERNEL); |
188 | if (!inuse) | |
189 | return -ENOMEM; | |
190 | ||
1da177e4 LT |
191 | set_bit(0, inuse); /* zero is reserved */ |
192 | list_for_each_entry(p, &br->port_list, list) { | |
193 | set_bit(p->port_no, inuse); | |
194 | } | |
195 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); | |
196 | kfree(inuse); | |
197 | ||
198 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; | |
199 | } | |
200 | ||
4433f420 | 201 | /* called with RTNL but without bridge lock */ |
9d6f229f | 202 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
4433f420 | 203 | struct net_device *dev) |
1da177e4 LT |
204 | { |
205 | int index; | |
206 | struct net_bridge_port *p; | |
9d6f229f | 207 | |
1da177e4 LT |
208 | index = find_portno(br); |
209 | if (index < 0) | |
210 | return ERR_PTR(index); | |
211 | ||
cee48541 | 212 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 LT |
213 | if (p == NULL) |
214 | return ERR_PTR(-ENOMEM); | |
215 | ||
1da177e4 LT |
216 | p->br = br; |
217 | dev_hold(dev); | |
218 | p->dev = dev; | |
4433f420 | 219 | p->path_cost = port_cost(dev); |
9d6f229f | 220 | p->priority = 0x8000 >> BR_PORT_BITS; |
1da177e4 | 221 | p->port_no = index; |
3982d3d2 | 222 | p->flags = 0; |
1da177e4 LT |
223 | br_init_port(p); |
224 | p->state = BR_STATE_DISABLED; | |
d32439c0 | 225 | br_stp_port_timer_init(p); |
3fe2d7c7 | 226 | br_multicast_add_port(p); |
1da177e4 LT |
227 | |
228 | return p; | |
229 | } | |
230 | ||
4aa678ba | 231 | int br_add_bridge(struct net *net, const char *name) |
1da177e4 LT |
232 | { |
233 | struct net_device *dev; | |
11f3a6bd | 234 | int res; |
1da177e4 | 235 | |
bb900b27 | 236 | dev = alloc_netdev(sizeof(struct net_bridge), name, |
237 | br_dev_setup); | |
238 | ||
9d6f229f | 239 | if (!dev) |
1da177e4 LT |
240 | return -ENOMEM; |
241 | ||
bb900b27 | 242 | dev_net_set(dev, net); |
149ddd83 | 243 | dev->rtnl_link_ops = &br_link_ops; |
e340a90e | 244 | |
11f3a6bd ED |
245 | res = register_netdev(dev); |
246 | if (res) | |
247 | free_netdev(dev); | |
248 | return res; | |
1da177e4 LT |
249 | } |
250 | ||
4aa678ba | 251 | int br_del_bridge(struct net *net, const char *name) |
1da177e4 LT |
252 | { |
253 | struct net_device *dev; | |
254 | int ret = 0; | |
255 | ||
256 | rtnl_lock(); | |
4aa678ba | 257 | dev = __dev_get_by_name(net, name); |
9d6f229f | 258 | if (dev == NULL) |
1da177e4 LT |
259 | ret = -ENXIO; /* Could not find device */ |
260 | ||
261 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
262 | /* Attempt to delete non bridge device! */ | |
263 | ret = -EPERM; | |
264 | } | |
265 | ||
266 | else if (dev->flags & IFF_UP) { | |
267 | /* Not shutdown yet. */ | |
268 | ret = -EBUSY; | |
9d6f229f | 269 | } |
1da177e4 | 270 | |
9d6f229f | 271 | else |
1ce5cce8 | 272 | br_dev_delete(dev, NULL); |
1da177e4 LT |
273 | |
274 | rtnl_unlock(); | |
275 | return ret; | |
276 | } | |
277 | ||
46f25dff | 278 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
1da177e4 LT |
279 | int br_min_mtu(const struct net_bridge *br) |
280 | { | |
281 | const struct net_bridge_port *p; | |
282 | int mtu = 0; | |
283 | ||
284 | ASSERT_RTNL(); | |
285 | ||
286 | if (list_empty(&br->port_list)) | |
46f25dff | 287 | mtu = ETH_DATA_LEN; |
1da177e4 LT |
288 | else { |
289 | list_for_each_entry(p, &br->port_list, list) { | |
290 | if (!mtu || p->dev->mtu < mtu) | |
291 | mtu = p->dev->mtu; | |
292 | } | |
293 | } | |
294 | return mtu; | |
295 | } | |
296 | ||
81d35307 SH |
297 | /* |
298 | * Recomputes features using slave's features | |
299 | */ | |
c8f44aff MM |
300 | netdev_features_t br_features_recompute(struct net_bridge *br, |
301 | netdev_features_t features) | |
81d35307 SH |
302 | { |
303 | struct net_bridge_port *p; | |
c8f44aff | 304 | netdev_features_t mask; |
81d35307 | 305 | |
b63365a2 | 306 | if (list_empty(&br->port_list)) |
c4d27ef9 | 307 | return features; |
b63365a2 | 308 | |
c4d27ef9 | 309 | mask = features; |
b63365a2 | 310 | features &= ~NETIF_F_ONE_FOR_ALL; |
81d35307 SH |
311 | |
312 | list_for_each_entry(p, &br->port_list, list) { | |
b63365a2 HX |
313 | features = netdev_increment_features(features, |
314 | p->dev->features, mask); | |
81d35307 SH |
315 | } |
316 | ||
c4d27ef9 | 317 | return features; |
81d35307 SH |
318 | } |
319 | ||
1da177e4 LT |
320 | /* called with RTNL */ |
321 | int br_add_if(struct net_bridge *br, struct net_device *dev) | |
322 | { | |
323 | struct net_bridge_port *p; | |
324 | int err = 0; | |
edf947f1 | 325 | bool changed_addr; |
1da177e4 | 326 | |
1056bd51 SH |
327 | /* Don't allow bridging non-ethernet like devices */ |
328 | if ((dev->flags & IFF_LOOPBACK) || | |
77f98598 | 329 | dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN || |
330 | !is_valid_ether_addr(dev->dev_addr)) | |
1da177e4 LT |
331 | return -EINVAL; |
332 | ||
1056bd51 | 333 | /* No bridging of bridges */ |
00829823 | 334 | if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit) |
1da177e4 LT |
335 | return -ELOOP; |
336 | ||
1056bd51 | 337 | /* Device is already being bridged */ |
f350a0a8 | 338 | if (br_port_exists(dev)) |
1da177e4 LT |
339 | return -EBUSY; |
340 | ||
ad4bb6f8 JB |
341 | /* No bridging devices that dislike that (e.g. wireless) */ |
342 | if (dev->priv_flags & IFF_DONT_BRIDGE) | |
343 | return -EOPNOTSUPP; | |
344 | ||
bab1deea SH |
345 | p = new_nbp(br, dev); |
346 | if (IS_ERR(p)) | |
1da177e4 LT |
347 | return PTR_ERR(p); |
348 | ||
bb8ed630 AW |
349 | call_netdevice_notifiers(NETDEV_JOIN, dev); |
350 | ||
bc3f9076 WC |
351 | err = dev_set_promiscuity(dev, 1); |
352 | if (err) | |
353 | goto put_back; | |
354 | ||
e32cc736 GKH |
355 | err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), |
356 | SYSFS_BRIDGE_PORT_ATTR); | |
bab1deea SH |
357 | if (err) |
358 | goto err1; | |
1da177e4 | 359 | |
bab1deea SH |
360 | err = br_sysfs_addif(p); |
361 | if (err) | |
362 | goto err2; | |
1da177e4 | 363 | |
47be03a2 | 364 | if (br_netpoll_info(br) && ((err = br_netpoll_enable(p, GFP_KERNEL)))) |
91d2c34a HX |
365 | goto err3; |
366 | ||
afc6151a | 367 | err = netdev_set_master(dev, br->dev); |
ab95bfe0 | 368 | if (err) |
f350a0a8 JP |
369 | goto err3; |
370 | ||
afc6151a JP |
371 | err = netdev_rx_handler_register(dev, br_handle_frame, p); |
372 | if (err) | |
373 | goto err4; | |
374 | ||
f350a0a8 | 375 | dev->priv_flags |= IFF_BRIDGE_PORT; |
ab95bfe0 | 376 | |
0187bdfb | 377 | dev_disable_lro(dev); |
bab1deea SH |
378 | |
379 | list_add_rcu(&p->list, &br->port_list); | |
380 | ||
c4d27ef9 MM |
381 | netdev_update_features(br->dev); |
382 | ||
bab1deea | 383 | spin_lock_bh(&br->lock); |
edf947f1 | 384 | changed_addr = br_stp_recalculate_bridge_id(br); |
de79059e AS |
385 | |
386 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) && | |
387 | (br->dev->flags & IFF_UP)) | |
388 | br_stp_enable_port(p); | |
bab1deea SH |
389 | spin_unlock_bh(&br->lock); |
390 | ||
b86c4503 SH |
391 | br_ifinfo_notify(RTM_NEWLINK, p); |
392 | ||
edf947f1 | 393 | if (changed_addr) |
56139fc5 | 394 | call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); |
edf947f1 | 395 | |
bab1deea | 396 | dev_set_mtu(br->dev, br_min_mtu(br)); |
269def7c | 397 | |
77f98598 | 398 | if (br_fdb_insert(br, p, dev->dev_addr)) |
399 | netdev_err(dev, "failed insert local address bridge forwarding table\n"); | |
400 | ||
bab1deea | 401 | kobject_uevent(&p->kobj, KOBJ_ADD); |
1da177e4 | 402 | |
bab1deea | 403 | return 0; |
afc6151a JP |
404 | |
405 | err4: | |
406 | netdev_set_master(dev, NULL); | |
91d2c34a HX |
407 | err3: |
408 | sysfs_remove_link(br->ifobj, p->dev->name); | |
bab1deea | 409 | err2: |
c587aea9 | 410 | kobject_put(&p->kobj); |
30df94f8 | 411 | p = NULL; /* kobject_put frees */ |
77f98598 | 412 | err1: |
bc3f9076 | 413 | dev_set_promiscuity(dev, -1); |
43af8532 VL |
414 | put_back: |
415 | dev_put(dev); | |
bc3f9076 | 416 | kfree(p); |
1da177e4 LT |
417 | return err; |
418 | } | |
419 | ||
420 | /* called with RTNL */ | |
421 | int br_del_if(struct net_bridge *br, struct net_device *dev) | |
422 | { | |
f350a0a8 | 423 | struct net_bridge_port *p; |
9be6dd65 | 424 | bool changed_addr; |
f350a0a8 | 425 | |
ec1e5610 | 426 | p = br_port_get_rtnl(dev); |
b5ed54e9 | 427 | if (!p || p->br != br) |
1da177e4 LT |
428 | return -EINVAL; |
429 | ||
d30362c0 AW |
430 | /* Since more than one interface can be attached to a bridge, |
431 | * there still maybe an alternate path for netconsole to use; | |
432 | * therefore there is no reason for a NETDEV_RELEASE event. | |
433 | */ | |
1da177e4 LT |
434 | del_nbp(p); |
435 | ||
436 | spin_lock_bh(&br->lock); | |
9be6dd65 | 437 | changed_addr = br_stp_recalculate_bridge_id(br); |
1da177e4 LT |
438 | spin_unlock_bh(&br->lock); |
439 | ||
9be6dd65 AW |
440 | if (changed_addr) |
441 | call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); | |
442 | ||
c4d27ef9 MM |
443 | netdev_update_features(br->dev); |
444 | ||
1da177e4 LT |
445 | return 0; |
446 | } | |
447 | ||
2c8c1e72 | 448 | void __net_exit br_net_exit(struct net *net) |
1da177e4 | 449 | { |
ab1b2046 | 450 | struct net_device *dev; |
8c56ba05 | 451 | LIST_HEAD(list); |
1da177e4 LT |
452 | |
453 | rtnl_lock(); | |
8c56ba05 ED |
454 | for_each_netdev(net, dev) |
455 | if (dev->priv_flags & IFF_EBRIDGE) | |
1ce5cce8 | 456 | br_dev_delete(dev, &list); |
8c56ba05 ED |
457 | |
458 | unregister_netdevice_many(&list); | |
1da177e4 LT |
459 | rtnl_unlock(); |
460 | ||
461 | } |