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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 | * | |
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 | 25 | #include <net/sock.h> |
407af329 | 26 | #include <linux/if_vlan.h> |
1da177e4 LT |
27 | |
28 | #include "br_private.h" | |
29 | ||
30 | /* | |
31 | * Determine initial path cost based on speed. | |
32 | * using recommendations from 802.1d standard | |
33 | * | |
61a44b9c | 34 | * Since driver might sleep need to not be holding any locks. |
1da177e4 | 35 | */ |
4433f420 | 36 | static int port_cost(struct net_device *dev) |
1da177e4 | 37 | { |
fa3df928 | 38 | struct ethtool_cmd ecmd; |
b4a488d1 | 39 | |
4bc71cb9 | 40 | if (!__ethtool_get_settings(dev, &ecmd)) { |
fa3df928 JP |
41 | switch (ethtool_cmd_speed(&ecmd)) { |
42 | case SPEED_10000: | |
43 | return 2; | |
44 | case SPEED_1000: | |
45 | return 4; | |
46 | case SPEED_100: | |
47 | return 19; | |
48 | case SPEED_10: | |
49 | return 100; | |
1da177e4 LT |
50 | } |
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 | ||
4433f420 | 63 | |
1a81a2e0 | 64 | /* Check for port carrier transitions. */ |
269def7c | 65 | void br_port_carrier_check(struct net_bridge_port *p) |
4433f420 | 66 | { |
269def7c SH |
67 | struct net_device *dev = p->dev; |
68 | struct net_bridge *br = p->br; | |
6e86b890 | 69 | |
8f3359bd | 70 | if (!(p->flags & BR_ADMIN_COST) && |
71 | netif_running(dev) && netif_oper_up(dev)) | |
6e86b890 SH |
72 | p->path_cost = port_cost(dev); |
73 | ||
aa7c6e5f | 74 | if (!netif_running(br->dev)) |
75 | return; | |
76 | ||
77 | spin_lock_bh(&br->lock); | |
576eb625 | 78 | if (netif_running(dev) && netif_oper_up(dev)) { |
aa7c6e5f | 79 | if (p->state == BR_STATE_DISABLED) |
80 | br_stp_enable_port(p); | |
81 | } else { | |
82 | if (p->state != BR_STATE_DISABLED) | |
83 | br_stp_disable_port(p); | |
4433f420 | 84 | } |
aa7c6e5f | 85 | spin_unlock_bh(&br->lock); |
4433f420 SH |
86 | } |
87 | ||
bab1deea SH |
88 | static void release_nbp(struct kobject *kobj) |
89 | { | |
90 | struct net_bridge_port *p | |
91 | = container_of(kobj, struct net_bridge_port, kobj); | |
92 | kfree(p); | |
93 | } | |
94 | ||
95 | static struct kobj_type brport_ktype = { | |
96 | #ifdef CONFIG_SYSFS | |
97 | .sysfs_ops = &brport_sysfs_ops, | |
98 | #endif | |
99 | .release = release_nbp, | |
100 | }; | |
101 | ||
1da177e4 LT |
102 | static void destroy_nbp(struct net_bridge_port *p) |
103 | { | |
104 | struct net_device *dev = p->dev; | |
105 | ||
1da177e4 LT |
106 | p->br = NULL; |
107 | p->dev = NULL; | |
108 | dev_put(dev); | |
109 | ||
bab1deea | 110 | kobject_put(&p->kobj); |
1da177e4 LT |
111 | } |
112 | ||
113 | static void destroy_nbp_rcu(struct rcu_head *head) | |
114 | { | |
115 | struct net_bridge_port *p = | |
116 | container_of(head, struct net_bridge_port, rcu); | |
117 | destroy_nbp(p); | |
118 | } | |
119 | ||
3f4cfc2d SH |
120 | /* Delete port(interface) from bridge is done in two steps. |
121 | * via RCU. First step, marks device as down. That deletes | |
122 | * all the timers and stops new packets from flowing through. | |
123 | * | |
124 | * Final cleanup doesn't occur until after all CPU's finished | |
125 | * processing packets. | |
126 | * | |
127 | * Protected from multiple admin operations by RTNL mutex | |
128 | */ | |
1da177e4 LT |
129 | static void del_nbp(struct net_bridge_port *p) |
130 | { | |
131 | struct net_bridge *br = p->br; | |
132 | struct net_device *dev = p->dev; | |
133 | ||
b3bcb72e | 134 | sysfs_remove_link(br->ifobj, p->dev->name); |
bab1deea | 135 | |
1da177e4 LT |
136 | dev_set_promiscuity(dev, -1); |
137 | ||
138 | spin_lock_bh(&br->lock); | |
139 | br_stp_disable_port(p); | |
140 | spin_unlock_bh(&br->lock); | |
141 | ||
b86c4503 SH |
142 | br_ifinfo_notify(RTM_DELLINK, p); |
143 | ||
243a2e63 | 144 | nbp_vlan_flush(p); |
1a620698 | 145 | br_fdb_delete_by_port(br, p, 1); |
1da177e4 LT |
146 | |
147 | list_del_rcu(&p->list); | |
148 | ||
f350a0a8 JP |
149 | dev->priv_flags &= ~IFF_BRIDGE_PORT; |
150 | ||
ab95bfe0 | 151 | netdev_rx_handler_unregister(dev); |
b3f1be4b | 152 | |
74fdd93f | 153 | netdev_upper_dev_unlink(dev, br->dev); |
afc6151a | 154 | |
3fe2d7c7 HX |
155 | br_multicast_del_port(p); |
156 | ||
125a12cc | 157 | kobject_uevent(&p->kobj, KOBJ_REMOVE); |
bab1deea SH |
158 | kobject_del(&p->kobj); |
159 | ||
91d2c34a HX |
160 | br_netpoll_disable(p); |
161 | ||
1da177e4 LT |
162 | call_rcu(&p->rcu, destroy_nbp_rcu); |
163 | } | |
164 | ||
1ce5cce8 | 165 | /* Delete bridge device */ |
166 | void br_dev_delete(struct net_device *dev, struct list_head *head) | |
1da177e4 | 167 | { |
1ce5cce8 | 168 | struct net_bridge *br = netdev_priv(dev); |
1da177e4 LT |
169 | struct net_bridge_port *p, *n; |
170 | ||
171 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
1da177e4 LT |
172 | del_nbp(p); |
173 | } | |
174 | ||
f8730420 DT |
175 | br_fdb_delete_by_port(br, NULL, 1); |
176 | ||
b4e09b29 | 177 | br_vlan_flush(br); |
1da177e4 LT |
178 | del_timer_sync(&br->gc_timer); |
179 | ||
180 | br_sysfs_delbr(br->dev); | |
8c56ba05 | 181 | unregister_netdevice_queue(br->dev, head); |
1da177e4 LT |
182 | } |
183 | ||
1da177e4 LT |
184 | /* find an available port number */ |
185 | static int find_portno(struct net_bridge *br) | |
186 | { | |
187 | int index; | |
188 | struct net_bridge_port *p; | |
189 | unsigned long *inuse; | |
190 | ||
3b781fa1 | 191 | inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long), |
1da177e4 LT |
192 | GFP_KERNEL); |
193 | if (!inuse) | |
194 | return -ENOMEM; | |
195 | ||
1da177e4 LT |
196 | set_bit(0, inuse); /* zero is reserved */ |
197 | list_for_each_entry(p, &br->port_list, list) { | |
198 | set_bit(p->port_no, inuse); | |
199 | } | |
200 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); | |
201 | kfree(inuse); | |
202 | ||
203 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; | |
204 | } | |
205 | ||
4433f420 | 206 | /* called with RTNL but without bridge lock */ |
9d6f229f | 207 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
4433f420 | 208 | struct net_device *dev) |
1da177e4 LT |
209 | { |
210 | int index; | |
211 | struct net_bridge_port *p; | |
9d6f229f | 212 | |
1da177e4 LT |
213 | index = find_portno(br); |
214 | if (index < 0) | |
215 | return ERR_PTR(index); | |
216 | ||
cee48541 | 217 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 LT |
218 | if (p == NULL) |
219 | return ERR_PTR(-ENOMEM); | |
220 | ||
1da177e4 LT |
221 | p->br = br; |
222 | dev_hold(dev); | |
223 | p->dev = dev; | |
4433f420 | 224 | p->path_cost = port_cost(dev); |
9d6f229f | 225 | p->priority = 0x8000 >> BR_PORT_BITS; |
1da177e4 | 226 | p->port_no = index; |
867a5943 | 227 | p->flags = BR_LEARNING | BR_FLOOD; |
1da177e4 LT |
228 | br_init_port(p); |
229 | p->state = BR_STATE_DISABLED; | |
d32439c0 | 230 | br_stp_port_timer_init(p); |
3fe2d7c7 | 231 | br_multicast_add_port(p); |
1da177e4 LT |
232 | |
233 | return p; | |
234 | } | |
235 | ||
4aa678ba | 236 | int br_add_bridge(struct net *net, const char *name) |
1da177e4 LT |
237 | { |
238 | struct net_device *dev; | |
11f3a6bd | 239 | int res; |
1da177e4 | 240 | |
bb900b27 | 241 | dev = alloc_netdev(sizeof(struct net_bridge), name, |
242 | br_dev_setup); | |
243 | ||
9d6f229f | 244 | if (!dev) |
1da177e4 LT |
245 | return -ENOMEM; |
246 | ||
bb900b27 | 247 | dev_net_set(dev, net); |
149ddd83 | 248 | dev->rtnl_link_ops = &br_link_ops; |
e340a90e | 249 | |
11f3a6bd ED |
250 | res = register_netdev(dev); |
251 | if (res) | |
252 | free_netdev(dev); | |
253 | return res; | |
1da177e4 LT |
254 | } |
255 | ||
4aa678ba | 256 | int br_del_bridge(struct net *net, const char *name) |
1da177e4 LT |
257 | { |
258 | struct net_device *dev; | |
259 | int ret = 0; | |
260 | ||
261 | rtnl_lock(); | |
4aa678ba | 262 | dev = __dev_get_by_name(net, name); |
9d6f229f | 263 | if (dev == NULL) |
1da177e4 LT |
264 | ret = -ENXIO; /* Could not find device */ |
265 | ||
266 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
267 | /* Attempt to delete non bridge device! */ | |
268 | ret = -EPERM; | |
269 | } | |
270 | ||
271 | else if (dev->flags & IFF_UP) { | |
272 | /* Not shutdown yet. */ | |
273 | ret = -EBUSY; | |
9d6f229f | 274 | } |
1da177e4 | 275 | |
9d6f229f | 276 | else |
1ce5cce8 | 277 | br_dev_delete(dev, NULL); |
1da177e4 LT |
278 | |
279 | rtnl_unlock(); | |
280 | return ret; | |
281 | } | |
282 | ||
46f25dff | 283 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
1da177e4 LT |
284 | int br_min_mtu(const struct net_bridge *br) |
285 | { | |
286 | const struct net_bridge_port *p; | |
287 | int mtu = 0; | |
288 | ||
289 | ASSERT_RTNL(); | |
290 | ||
291 | if (list_empty(&br->port_list)) | |
46f25dff | 292 | mtu = ETH_DATA_LEN; |
1da177e4 LT |
293 | else { |
294 | list_for_each_entry(p, &br->port_list, list) { | |
295 | if (!mtu || p->dev->mtu < mtu) | |
296 | mtu = p->dev->mtu; | |
297 | } | |
298 | } | |
299 | return mtu; | |
300 | } | |
301 | ||
81d35307 SH |
302 | /* |
303 | * Recomputes features using slave's features | |
304 | */ | |
c8f44aff MM |
305 | netdev_features_t br_features_recompute(struct net_bridge *br, |
306 | netdev_features_t features) | |
81d35307 SH |
307 | { |
308 | struct net_bridge_port *p; | |
c8f44aff | 309 | netdev_features_t mask; |
81d35307 | 310 | |
b63365a2 | 311 | if (list_empty(&br->port_list)) |
c4d27ef9 | 312 | return features; |
b63365a2 | 313 | |
c4d27ef9 | 314 | mask = features; |
b63365a2 | 315 | features &= ~NETIF_F_ONE_FOR_ALL; |
81d35307 SH |
316 | |
317 | list_for_each_entry(p, &br->port_list, list) { | |
b63365a2 HX |
318 | features = netdev_increment_features(features, |
319 | p->dev->features, mask); | |
81d35307 SH |
320 | } |
321 | ||
c4d27ef9 | 322 | return features; |
81d35307 SH |
323 | } |
324 | ||
1da177e4 LT |
325 | /* called with RTNL */ |
326 | int br_add_if(struct net_bridge *br, struct net_device *dev) | |
327 | { | |
328 | struct net_bridge_port *p; | |
329 | int err = 0; | |
edf947f1 | 330 | bool changed_addr; |
1da177e4 | 331 | |
1056bd51 SH |
332 | /* Don't allow bridging non-ethernet like devices */ |
333 | if ((dev->flags & IFF_LOOPBACK) || | |
77f98598 | 334 | dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN || |
335 | !is_valid_ether_addr(dev->dev_addr)) | |
1da177e4 LT |
336 | return -EINVAL; |
337 | ||
1056bd51 | 338 | /* No bridging of bridges */ |
00829823 | 339 | if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit) |
1da177e4 LT |
340 | return -ELOOP; |
341 | ||
1056bd51 | 342 | /* Device is already being bridged */ |
f350a0a8 | 343 | if (br_port_exists(dev)) |
1da177e4 LT |
344 | return -EBUSY; |
345 | ||
ad4bb6f8 JB |
346 | /* No bridging devices that dislike that (e.g. wireless) */ |
347 | if (dev->priv_flags & IFF_DONT_BRIDGE) | |
348 | return -EOPNOTSUPP; | |
349 | ||
bab1deea SH |
350 | p = new_nbp(br, dev); |
351 | if (IS_ERR(p)) | |
1da177e4 LT |
352 | return PTR_ERR(p); |
353 | ||
bb8ed630 AW |
354 | call_netdevice_notifiers(NETDEV_JOIN, dev); |
355 | ||
bc3f9076 WC |
356 | err = dev_set_promiscuity(dev, 1); |
357 | if (err) | |
358 | goto put_back; | |
359 | ||
e32cc736 GKH |
360 | err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), |
361 | SYSFS_BRIDGE_PORT_ATTR); | |
bab1deea SH |
362 | if (err) |
363 | goto err1; | |
1da177e4 | 364 | |
bab1deea SH |
365 | err = br_sysfs_addif(p); |
366 | if (err) | |
367 | goto err2; | |
1da177e4 | 368 | |
a8779ec1 | 369 | err = br_netpoll_enable(p); |
93d8bf9f | 370 | if (err) |
91d2c34a HX |
371 | goto err3; |
372 | ||
74fdd93f | 373 | err = netdev_master_upper_dev_link(dev, br->dev); |
ab95bfe0 | 374 | if (err) |
9b1536c4 | 375 | goto err4; |
f350a0a8 | 376 | |
afc6151a JP |
377 | err = netdev_rx_handler_register(dev, br_handle_frame, p); |
378 | if (err) | |
9b1536c4 | 379 | goto err5; |
afc6151a | 380 | |
f350a0a8 | 381 | dev->priv_flags |= IFF_BRIDGE_PORT; |
ab95bfe0 | 382 | |
0187bdfb | 383 | dev_disable_lro(dev); |
bab1deea SH |
384 | |
385 | list_add_rcu(&p->list, &br->port_list); | |
386 | ||
c4d27ef9 MM |
387 | netdev_update_features(br->dev); |
388 | ||
fd094808 FF |
389 | if (br->dev->needed_headroom < dev->needed_headroom) |
390 | br->dev->needed_headroom = dev->needed_headroom; | |
391 | ||
a4b816d8 TM |
392 | if (br_fdb_insert(br, p, dev->dev_addr, 0)) |
393 | netdev_err(dev, "failed insert local address bridge forwarding table\n"); | |
394 | ||
bab1deea | 395 | spin_lock_bh(&br->lock); |
edf947f1 | 396 | changed_addr = br_stp_recalculate_bridge_id(br); |
de79059e | 397 | |
576eb625 | 398 | if (netif_running(dev) && netif_oper_up(dev) && |
de79059e AS |
399 | (br->dev->flags & IFF_UP)) |
400 | br_stp_enable_port(p); | |
bab1deea SH |
401 | spin_unlock_bh(&br->lock); |
402 | ||
b86c4503 SH |
403 | br_ifinfo_notify(RTM_NEWLINK, p); |
404 | ||
edf947f1 | 405 | if (changed_addr) |
56139fc5 | 406 | call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); |
edf947f1 | 407 | |
bab1deea | 408 | dev_set_mtu(br->dev, br_min_mtu(br)); |
269def7c | 409 | |
bab1deea | 410 | kobject_uevent(&p->kobj, KOBJ_ADD); |
1da177e4 | 411 | |
bab1deea | 412 | return 0; |
afc6151a | 413 | |
9b1536c4 | 414 | err5: |
74fdd93f | 415 | netdev_upper_dev_unlink(dev, br->dev); |
9b1536c4 G |
416 | err4: |
417 | br_netpoll_disable(p); | |
91d2c34a HX |
418 | err3: |
419 | sysfs_remove_link(br->ifobj, p->dev->name); | |
bab1deea | 420 | err2: |
c587aea9 | 421 | kobject_put(&p->kobj); |
30df94f8 | 422 | p = NULL; /* kobject_put frees */ |
77f98598 | 423 | err1: |
bc3f9076 | 424 | dev_set_promiscuity(dev, -1); |
43af8532 VL |
425 | put_back: |
426 | dev_put(dev); | |
bc3f9076 | 427 | kfree(p); |
1da177e4 LT |
428 | return err; |
429 | } | |
430 | ||
431 | /* called with RTNL */ | |
432 | int br_del_if(struct net_bridge *br, struct net_device *dev) | |
433 | { | |
f350a0a8 | 434 | struct net_bridge_port *p; |
9be6dd65 | 435 | bool changed_addr; |
f350a0a8 | 436 | |
ec1e5610 | 437 | p = br_port_get_rtnl(dev); |
b5ed54e9 | 438 | if (!p || p->br != br) |
1da177e4 LT |
439 | return -EINVAL; |
440 | ||
d30362c0 AW |
441 | /* Since more than one interface can be attached to a bridge, |
442 | * there still maybe an alternate path for netconsole to use; | |
443 | * therefore there is no reason for a NETDEV_RELEASE event. | |
444 | */ | |
1da177e4 LT |
445 | del_nbp(p); |
446 | ||
447 | spin_lock_bh(&br->lock); | |
9be6dd65 | 448 | changed_addr = br_stp_recalculate_bridge_id(br); |
1da177e4 LT |
449 | spin_unlock_bh(&br->lock); |
450 | ||
9be6dd65 AW |
451 | if (changed_addr) |
452 | call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); | |
453 | ||
c4d27ef9 MM |
454 | netdev_update_features(br->dev); |
455 | ||
1da177e4 LT |
456 | return 0; |
457 | } |