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> | |
c06ee961 | 16 | #include <linux/netpoll.h> |
1da177e4 LT |
17 | #include <linux/ethtool.h> |
18 | #include <linux/if_arp.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/rtnetlink.h> | |
46f25dff | 22 | #include <linux/if_ether.h> |
5a0e3ad6 | 23 | #include <linux/slab.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 | * | |
61a44b9c | 32 | * Since driver might sleep need to not be holding any locks. |
1da177e4 | 33 | */ |
4433f420 | 34 | static int port_cost(struct net_device *dev) |
1da177e4 | 35 | { |
b4a488d1 SH |
36 | if (dev->ethtool_ops && dev->ethtool_ops->get_settings) { |
37 | struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET, }; | |
38 | ||
25db0338 DD |
39 | if (!dev_ethtool_get_settings(dev, &ecmd)) { |
40 | switch (ethtool_cmd_speed(&ecmd)) { | |
61a44b9c MW |
41 | case SPEED_10000: |
42 | return 2; | |
b4a488d1 SH |
43 | case SPEED_1000: |
44 | return 4; | |
45 | case SPEED_100: | |
46 | return 19; | |
61a44b9c MW |
47 | case SPEED_10: |
48 | return 100; | |
49 | } | |
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 | |
944c794d | 64 | /* Check for port carrier transistions. */ |
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 | |
aa7c6e5f | 70 | if (netif_running(dev) && netif_carrier_ok(dev)) |
6e86b890 SH |
71 | p->path_cost = port_cost(dev); |
72 | ||
aa7c6e5f | 73 | if (!netif_running(br->dev)) |
74 | return; | |
75 | ||
76 | spin_lock_bh(&br->lock); | |
77 | if (netif_running(dev) && netif_carrier_ok(dev)) { | |
78 | if (p->state == BR_STATE_DISABLED) | |
79 | br_stp_enable_port(p); | |
80 | } else { | |
81 | if (p->state != BR_STATE_DISABLED) | |
82 | br_stp_disable_port(p); | |
4433f420 | 83 | } |
aa7c6e5f | 84 | spin_unlock_bh(&br->lock); |
4433f420 SH |
85 | } |
86 | ||
bab1deea SH |
87 | static void release_nbp(struct kobject *kobj) |
88 | { | |
89 | struct net_bridge_port *p | |
90 | = container_of(kobj, struct net_bridge_port, kobj); | |
91 | kfree(p); | |
92 | } | |
93 | ||
94 | static struct kobj_type brport_ktype = { | |
95 | #ifdef CONFIG_SYSFS | |
96 | .sysfs_ops = &brport_sysfs_ops, | |
97 | #endif | |
98 | .release = release_nbp, | |
99 | }; | |
100 | ||
1da177e4 LT |
101 | static void destroy_nbp(struct net_bridge_port *p) |
102 | { | |
103 | struct net_device *dev = p->dev; | |
104 | ||
1da177e4 LT |
105 | p->br = NULL; |
106 | p->dev = NULL; | |
107 | dev_put(dev); | |
108 | ||
bab1deea | 109 | kobject_put(&p->kobj); |
1da177e4 LT |
110 | } |
111 | ||
112 | static void destroy_nbp_rcu(struct rcu_head *head) | |
113 | { | |
114 | struct net_bridge_port *p = | |
115 | container_of(head, struct net_bridge_port, rcu); | |
116 | destroy_nbp(p); | |
117 | } | |
118 | ||
3f4cfc2d SH |
119 | /* Delete port(interface) from bridge is done in two steps. |
120 | * via RCU. First step, marks device as down. That deletes | |
121 | * all the timers and stops new packets from flowing through. | |
122 | * | |
123 | * Final cleanup doesn't occur until after all CPU's finished | |
124 | * processing packets. | |
125 | * | |
126 | * Protected from multiple admin operations by RTNL mutex | |
127 | */ | |
1da177e4 LT |
128 | static void del_nbp(struct net_bridge_port *p) |
129 | { | |
130 | struct net_bridge *br = p->br; | |
131 | struct net_device *dev = p->dev; | |
132 | ||
b3bcb72e | 133 | sysfs_remove_link(br->ifobj, p->dev->name); |
bab1deea | 134 | |
1da177e4 LT |
135 | dev_set_promiscuity(dev, -1); |
136 | ||
137 | spin_lock_bh(&br->lock); | |
138 | br_stp_disable_port(p); | |
139 | spin_unlock_bh(&br->lock); | |
140 | ||
b86c4503 SH |
141 | br_ifinfo_notify(RTM_DELLINK, p); |
142 | ||
1a620698 | 143 | br_fdb_delete_by_port(br, p, 1); |
1da177e4 LT |
144 | |
145 | list_del_rcu(&p->list); | |
146 | ||
f350a0a8 JP |
147 | dev->priv_flags &= ~IFF_BRIDGE_PORT; |
148 | ||
ab95bfe0 | 149 | netdev_rx_handler_unregister(dev); |
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 | ||
163 | /* called with RTNL */ | |
8c56ba05 | 164 | static void del_br(struct net_bridge *br, struct list_head *head) |
1da177e4 LT |
165 | { |
166 | struct net_bridge_port *p, *n; | |
167 | ||
168 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
1da177e4 LT |
169 | del_nbp(p); |
170 | } | |
171 | ||
172 | del_timer_sync(&br->gc_timer); | |
173 | ||
174 | br_sysfs_delbr(br->dev); | |
8c56ba05 | 175 | unregister_netdevice_queue(br->dev, head); |
1da177e4 LT |
176 | } |
177 | ||
1da177e4 LT |
178 | /* find an available port number */ |
179 | static int find_portno(struct net_bridge *br) | |
180 | { | |
181 | int index; | |
182 | struct net_bridge_port *p; | |
183 | unsigned long *inuse; | |
184 | ||
3b781fa1 | 185 | inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long), |
1da177e4 LT |
186 | GFP_KERNEL); |
187 | if (!inuse) | |
188 | return -ENOMEM; | |
189 | ||
1da177e4 LT |
190 | set_bit(0, inuse); /* zero is reserved */ |
191 | list_for_each_entry(p, &br->port_list, list) { | |
192 | set_bit(p->port_no, inuse); | |
193 | } | |
194 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); | |
195 | kfree(inuse); | |
196 | ||
197 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; | |
198 | } | |
199 | ||
4433f420 | 200 | /* called with RTNL but without bridge lock */ |
9d6f229f | 201 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
4433f420 | 202 | struct net_device *dev) |
1da177e4 LT |
203 | { |
204 | int index; | |
205 | struct net_bridge_port *p; | |
9d6f229f | 206 | |
1da177e4 LT |
207 | index = find_portno(br); |
208 | if (index < 0) | |
209 | return ERR_PTR(index); | |
210 | ||
cee48541 | 211 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
1da177e4 LT |
212 | if (p == NULL) |
213 | return ERR_PTR(-ENOMEM); | |
214 | ||
1da177e4 LT |
215 | p->br = br; |
216 | dev_hold(dev); | |
217 | p->dev = dev; | |
4433f420 | 218 | p->path_cost = port_cost(dev); |
9d6f229f | 219 | p->priority = 0x8000 >> BR_PORT_BITS; |
1da177e4 | 220 | p->port_no = index; |
3982d3d2 | 221 | p->flags = 0; |
1da177e4 LT |
222 | br_init_port(p); |
223 | p->state = BR_STATE_DISABLED; | |
d32439c0 | 224 | br_stp_port_timer_init(p); |
3fe2d7c7 | 225 | br_multicast_add_port(p); |
1da177e4 LT |
226 | |
227 | return p; | |
228 | } | |
229 | ||
4aa678ba | 230 | int br_add_bridge(struct net *net, const char *name) |
1da177e4 LT |
231 | { |
232 | struct net_device *dev; | |
1da177e4 | 233 | |
bb900b27 | 234 | dev = alloc_netdev(sizeof(struct net_bridge), name, |
235 | br_dev_setup); | |
236 | ||
9d6f229f | 237 | if (!dev) |
1da177e4 LT |
238 | return -ENOMEM; |
239 | ||
bb900b27 | 240 | dev_net_set(dev, net); |
e340a90e | 241 | |
bb900b27 | 242 | return register_netdev(dev); |
1da177e4 LT |
243 | } |
244 | ||
4aa678ba | 245 | int br_del_bridge(struct net *net, const char *name) |
1da177e4 LT |
246 | { |
247 | struct net_device *dev; | |
248 | int ret = 0; | |
249 | ||
250 | rtnl_lock(); | |
4aa678ba | 251 | dev = __dev_get_by_name(net, name); |
9d6f229f | 252 | if (dev == NULL) |
1da177e4 LT |
253 | ret = -ENXIO; /* Could not find device */ |
254 | ||
255 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
256 | /* Attempt to delete non bridge device! */ | |
257 | ret = -EPERM; | |
258 | } | |
259 | ||
260 | else if (dev->flags & IFF_UP) { | |
261 | /* Not shutdown yet. */ | |
262 | ret = -EBUSY; | |
9d6f229f | 263 | } |
1da177e4 | 264 | |
9d6f229f | 265 | else |
8c56ba05 | 266 | del_br(netdev_priv(dev), NULL); |
1da177e4 LT |
267 | |
268 | rtnl_unlock(); | |
269 | return ret; | |
270 | } | |
271 | ||
46f25dff | 272 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
1da177e4 LT |
273 | int br_min_mtu(const struct net_bridge *br) |
274 | { | |
275 | const struct net_bridge_port *p; | |
276 | int mtu = 0; | |
277 | ||
278 | ASSERT_RTNL(); | |
279 | ||
280 | if (list_empty(&br->port_list)) | |
46f25dff | 281 | mtu = ETH_DATA_LEN; |
1da177e4 LT |
282 | else { |
283 | list_for_each_entry(p, &br->port_list, list) { | |
284 | if (!mtu || p->dev->mtu < mtu) | |
285 | mtu = p->dev->mtu; | |
286 | } | |
287 | } | |
288 | return mtu; | |
289 | } | |
290 | ||
81d35307 SH |
291 | /* |
292 | * Recomputes features using slave's features | |
293 | */ | |
c4d27ef9 | 294 | u32 br_features_recompute(struct net_bridge *br, u32 features) |
81d35307 SH |
295 | { |
296 | struct net_bridge_port *p; | |
c4d27ef9 | 297 | u32 mask; |
81d35307 | 298 | |
b63365a2 | 299 | if (list_empty(&br->port_list)) |
c4d27ef9 | 300 | return features; |
b63365a2 | 301 | |
c4d27ef9 | 302 | mask = features; |
b63365a2 | 303 | features &= ~NETIF_F_ONE_FOR_ALL; |
81d35307 SH |
304 | |
305 | list_for_each_entry(p, &br->port_list, list) { | |
b63365a2 HX |
306 | features = netdev_increment_features(features, |
307 | p->dev->features, mask); | |
81d35307 SH |
308 | } |
309 | ||
c4d27ef9 | 310 | return features; |
81d35307 SH |
311 | } |
312 | ||
1da177e4 LT |
313 | /* called with RTNL */ |
314 | int br_add_if(struct net_bridge *br, struct net_device *dev) | |
315 | { | |
316 | struct net_bridge_port *p; | |
317 | int err = 0; | |
edf947f1 | 318 | bool changed_addr; |
1da177e4 | 319 | |
1056bd51 SH |
320 | /* Don't allow bridging non-ethernet like devices */ |
321 | if ((dev->flags & IFF_LOOPBACK) || | |
322 | dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN) | |
1da177e4 LT |
323 | return -EINVAL; |
324 | ||
1056bd51 | 325 | /* No bridging of bridges */ |
00829823 | 326 | if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit) |
1da177e4 LT |
327 | return -ELOOP; |
328 | ||
1056bd51 | 329 | /* Device is already being bridged */ |
f350a0a8 | 330 | if (br_port_exists(dev)) |
1da177e4 LT |
331 | return -EBUSY; |
332 | ||
ad4bb6f8 JB |
333 | /* No bridging devices that dislike that (e.g. wireless) */ |
334 | if (dev->priv_flags & IFF_DONT_BRIDGE) | |
335 | return -EOPNOTSUPP; | |
336 | ||
bab1deea SH |
337 | p = new_nbp(br, dev); |
338 | if (IS_ERR(p)) | |
1da177e4 LT |
339 | return PTR_ERR(p); |
340 | ||
bb8ed630 AW |
341 | call_netdevice_notifiers(NETDEV_JOIN, dev); |
342 | ||
bc3f9076 WC |
343 | err = dev_set_promiscuity(dev, 1); |
344 | if (err) | |
345 | goto put_back; | |
346 | ||
e32cc736 GKH |
347 | err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), |
348 | SYSFS_BRIDGE_PORT_ATTR); | |
bab1deea SH |
349 | if (err) |
350 | goto err0; | |
1da177e4 | 351 | |
9d6f229f | 352 | err = br_fdb_insert(br, p, dev->dev_addr); |
bab1deea SH |
353 | if (err) |
354 | goto err1; | |
1da177e4 | 355 | |
bab1deea SH |
356 | err = br_sysfs_addif(p); |
357 | if (err) | |
358 | goto err2; | |
1da177e4 | 359 | |
91d2c34a HX |
360 | if (br_netpoll_info(br) && ((err = br_netpoll_enable(p)))) |
361 | goto err3; | |
362 | ||
afc6151a | 363 | err = netdev_set_master(dev, br->dev); |
ab95bfe0 | 364 | if (err) |
f350a0a8 JP |
365 | goto err3; |
366 | ||
afc6151a JP |
367 | err = netdev_rx_handler_register(dev, br_handle_frame, p); |
368 | if (err) | |
369 | goto err4; | |
370 | ||
f350a0a8 | 371 | dev->priv_flags |= IFF_BRIDGE_PORT; |
ab95bfe0 | 372 | |
0187bdfb | 373 | dev_disable_lro(dev); |
bab1deea SH |
374 | |
375 | list_add_rcu(&p->list, &br->port_list); | |
376 | ||
c4d27ef9 MM |
377 | netdev_update_features(br->dev); |
378 | ||
bab1deea | 379 | spin_lock_bh(&br->lock); |
edf947f1 | 380 | changed_addr = br_stp_recalculate_bridge_id(br); |
de79059e AS |
381 | |
382 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) && | |
383 | (br->dev->flags & IFF_UP)) | |
384 | br_stp_enable_port(p); | |
bab1deea SH |
385 | spin_unlock_bh(&br->lock); |
386 | ||
b86c4503 SH |
387 | br_ifinfo_notify(RTM_NEWLINK, p); |
388 | ||
edf947f1 | 389 | if (changed_addr) |
390 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
391 | ||
bab1deea | 392 | dev_set_mtu(br->dev, br_min_mtu(br)); |
269def7c | 393 | |
bab1deea | 394 | kobject_uevent(&p->kobj, KOBJ_ADD); |
1da177e4 | 395 | |
bab1deea | 396 | return 0; |
afc6151a JP |
397 | |
398 | err4: | |
399 | netdev_set_master(dev, NULL); | |
91d2c34a HX |
400 | err3: |
401 | sysfs_remove_link(br->ifobj, p->dev->name); | |
bab1deea | 402 | err2: |
1a620698 | 403 | br_fdb_delete_by_port(br, p, 1); |
bab1deea | 404 | err1: |
c587aea9 | 405 | kobject_put(&p->kobj); |
30df94f8 | 406 | p = NULL; /* kobject_put frees */ |
bab1deea | 407 | err0: |
bc3f9076 | 408 | dev_set_promiscuity(dev, -1); |
43af8532 VL |
409 | put_back: |
410 | dev_put(dev); | |
bc3f9076 | 411 | kfree(p); |
1da177e4 LT |
412 | return err; |
413 | } | |
414 | ||
415 | /* called with RTNL */ | |
416 | int br_del_if(struct net_bridge *br, struct net_device *dev) | |
417 | { | |
f350a0a8 JP |
418 | struct net_bridge_port *p; |
419 | ||
ec1e5610 | 420 | p = br_port_get_rtnl(dev); |
b5ed54e9 | 421 | if (!p || p->br != br) |
1da177e4 LT |
422 | return -EINVAL; |
423 | ||
1da177e4 LT |
424 | del_nbp(p); |
425 | ||
426 | spin_lock_bh(&br->lock); | |
427 | br_stp_recalculate_bridge_id(br); | |
428 | spin_unlock_bh(&br->lock); | |
429 | ||
c4d27ef9 MM |
430 | netdev_update_features(br->dev); |
431 | ||
1da177e4 LT |
432 | return 0; |
433 | } | |
434 | ||
2c8c1e72 | 435 | void __net_exit br_net_exit(struct net *net) |
1da177e4 | 436 | { |
ab1b2046 | 437 | struct net_device *dev; |
8c56ba05 | 438 | LIST_HEAD(list); |
1da177e4 LT |
439 | |
440 | rtnl_lock(); | |
8c56ba05 ED |
441 | for_each_netdev(net, dev) |
442 | if (dev->priv_flags & IFF_EBRIDGE) | |
443 | del_br(netdev_priv(dev), &list); | |
444 | ||
445 | unregister_netdevice_many(&list); | |
1da177e4 LT |
446 | rtnl_unlock(); |
447 | ||
448 | } |