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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> | |
23 | #include <net/sock.h> | |
24 | ||
25 | #include "br_private.h" | |
26 | ||
27 | /* | |
28 | * Determine initial path cost based on speed. | |
29 | * using recommendations from 802.1d standard | |
30 | * | |
31 | * Need to simulate user ioctl because not all device's that support | |
32 | * ethtool, use ethtool_ops. Also, since driver might sleep need to | |
33 | * not be holding any locks. | |
34 | */ | |
4433f420 | 35 | static int port_cost(struct net_device *dev) |
1da177e4 | 36 | { |
1da177e4 LT |
37 | struct ethtool_cmd ecmd = { ETHTOOL_GSET }; |
38 | struct ifreq ifr; | |
39 | mm_segment_t old_fs; | |
40 | int err; | |
41 | ||
42 | strncpy(ifr.ifr_name, dev->name, IFNAMSIZ); | |
43 | ifr.ifr_data = (void __user *) &ecmd; | |
44 | ||
45 | old_fs = get_fs(); | |
46 | set_fs(KERNEL_DS); | |
47 | err = dev_ethtool(&ifr); | |
48 | set_fs(old_fs); | |
49 | ||
50 | if (!err) { | |
51 | switch(ecmd.speed) { | |
52 | case SPEED_100: | |
53 | return 19; | |
54 | case SPEED_1000: | |
55 | return 4; | |
56 | case SPEED_10000: | |
57 | return 2; | |
58 | case SPEED_10: | |
59 | return 100; | |
1da177e4 LT |
60 | } |
61 | } | |
62 | ||
63 | /* Old silly heuristics based on name */ | |
64 | if (!strncmp(dev->name, "lec", 3)) | |
65 | return 7; | |
66 | ||
67 | if (!strncmp(dev->name, "plip", 4)) | |
68 | return 2500; | |
69 | ||
70 | return 100; /* assume old 10Mbps */ | |
71 | } | |
72 | ||
4433f420 SH |
73 | |
74 | /* | |
75 | * Check for port carrier transistions. | |
76 | * Called from work queue to allow for calling functions that | |
77 | * might sleep (such as speed check), and to debounce. | |
78 | */ | |
79 | static void port_carrier_check(void *arg) | |
80 | { | |
81 | struct net_bridge_port *p = arg; | |
82 | ||
83 | rtnl_lock(); | |
84 | if (netif_carrier_ok(p->dev)) { | |
85 | u32 cost = port_cost(p->dev); | |
86 | ||
87 | spin_lock_bh(&p->br->lock); | |
88 | if (p->state == BR_STATE_DISABLED) { | |
89 | p->path_cost = cost; | |
90 | br_stp_enable_port(p); | |
91 | } | |
92 | spin_unlock_bh(&p->br->lock); | |
93 | } else { | |
94 | spin_lock_bh(&p->br->lock); | |
95 | if (p->state != BR_STATE_DISABLED) | |
96 | br_stp_disable_port(p); | |
97 | spin_unlock_bh(&p->br->lock); | |
98 | } | |
99 | rtnl_unlock(); | |
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 | ||
110 | br_sysfs_freeif(p); | |
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 | ||
120 | /* called with RTNL */ | |
121 | static void del_nbp(struct net_bridge_port *p) | |
122 | { | |
123 | struct net_bridge *br = p->br; | |
124 | struct net_device *dev = p->dev; | |
125 | ||
ab4060e8 | 126 | dev->br_port = NULL; |
1da177e4 LT |
127 | dev_set_promiscuity(dev, -1); |
128 | ||
4433f420 SH |
129 | cancel_delayed_work(&p->carrier_check); |
130 | flush_scheduled_work(); | |
131 | ||
1da177e4 LT |
132 | spin_lock_bh(&br->lock); |
133 | br_stp_disable_port(p); | |
134 | spin_unlock_bh(&br->lock); | |
135 | ||
136 | br_fdb_delete_by_port(br, p); | |
137 | ||
138 | list_del_rcu(&p->list); | |
139 | ||
140 | del_timer_sync(&p->message_age_timer); | |
141 | del_timer_sync(&p->forward_delay_timer); | |
142 | del_timer_sync(&p->hold_timer); | |
143 | ||
144 | call_rcu(&p->rcu, destroy_nbp_rcu); | |
145 | } | |
146 | ||
147 | /* called with RTNL */ | |
148 | static void del_br(struct net_bridge *br) | |
149 | { | |
150 | struct net_bridge_port *p, *n; | |
151 | ||
152 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
153 | br_sysfs_removeif(p); | |
154 | del_nbp(p); | |
155 | } | |
156 | ||
157 | del_timer_sync(&br->gc_timer); | |
158 | ||
159 | br_sysfs_delbr(br->dev); | |
160 | unregister_netdevice(br->dev); | |
161 | } | |
162 | ||
163 | static struct net_device *new_bridge_dev(const char *name) | |
164 | { | |
165 | struct net_bridge *br; | |
166 | struct net_device *dev; | |
167 | ||
168 | dev = alloc_netdev(sizeof(struct net_bridge), name, | |
169 | br_dev_setup); | |
170 | ||
171 | if (!dev) | |
172 | return NULL; | |
173 | ||
174 | br = netdev_priv(dev); | |
175 | br->dev = dev; | |
176 | ||
177 | spin_lock_init(&br->lock); | |
178 | INIT_LIST_HEAD(&br->port_list); | |
179 | spin_lock_init(&br->hash_lock); | |
180 | ||
181 | br->bridge_id.prio[0] = 0x80; | |
182 | br->bridge_id.prio[1] = 0x00; | |
183 | memset(br->bridge_id.addr, 0, ETH_ALEN); | |
184 | ||
185 | br->stp_enabled = 0; | |
186 | br->designated_root = br->bridge_id; | |
187 | br->root_path_cost = 0; | |
188 | br->root_port = 0; | |
189 | br->bridge_max_age = br->max_age = 20 * HZ; | |
190 | br->bridge_hello_time = br->hello_time = 2 * HZ; | |
191 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; | |
192 | br->topology_change = 0; | |
193 | br->topology_change_detected = 0; | |
194 | br->ageing_time = 300 * HZ; | |
195 | INIT_LIST_HEAD(&br->age_list); | |
196 | ||
197 | br_stp_timer_init(br); | |
198 | ||
199 | return dev; | |
200 | } | |
201 | ||
202 | /* find an available port number */ | |
203 | static int find_portno(struct net_bridge *br) | |
204 | { | |
205 | int index; | |
206 | struct net_bridge_port *p; | |
207 | unsigned long *inuse; | |
208 | ||
209 | inuse = kmalloc(BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long), | |
210 | GFP_KERNEL); | |
211 | if (!inuse) | |
212 | return -ENOMEM; | |
213 | ||
214 | memset(inuse, 0, BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long)); | |
215 | set_bit(0, inuse); /* zero is reserved */ | |
216 | list_for_each_entry(p, &br->port_list, list) { | |
217 | set_bit(p->port_no, inuse); | |
218 | } | |
219 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); | |
220 | kfree(inuse); | |
221 | ||
222 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; | |
223 | } | |
224 | ||
4433f420 | 225 | /* called with RTNL but without bridge lock */ |
1da177e4 | 226 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
4433f420 | 227 | struct net_device *dev) |
1da177e4 LT |
228 | { |
229 | int index; | |
230 | struct net_bridge_port *p; | |
231 | ||
232 | index = find_portno(br); | |
233 | if (index < 0) | |
234 | return ERR_PTR(index); | |
235 | ||
236 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
237 | if (p == NULL) | |
238 | return ERR_PTR(-ENOMEM); | |
239 | ||
240 | memset(p, 0, sizeof(*p)); | |
241 | p->br = br; | |
242 | dev_hold(dev); | |
243 | p->dev = dev; | |
4433f420 | 244 | p->path_cost = port_cost(dev); |
1da177e4 LT |
245 | p->priority = 0x8000 >> BR_PORT_BITS; |
246 | dev->br_port = p; | |
247 | p->port_no = index; | |
248 | br_init_port(p); | |
249 | p->state = BR_STATE_DISABLED; | |
4433f420 | 250 | INIT_WORK(&p->carrier_check, port_carrier_check, p); |
1da177e4 LT |
251 | kobject_init(&p->kobj); |
252 | ||
253 | return p; | |
254 | } | |
255 | ||
256 | int br_add_bridge(const char *name) | |
257 | { | |
258 | struct net_device *dev; | |
259 | int ret; | |
260 | ||
261 | dev = new_bridge_dev(name); | |
262 | if (!dev) | |
263 | return -ENOMEM; | |
264 | ||
265 | rtnl_lock(); | |
266 | if (strchr(dev->name, '%')) { | |
267 | ret = dev_alloc_name(dev, dev->name); | |
268 | if (ret < 0) | |
269 | goto err1; | |
270 | } | |
271 | ||
272 | ret = register_netdevice(dev); | |
273 | if (ret) | |
274 | goto err2; | |
275 | ||
276 | /* network device kobject is not setup until | |
277 | * after rtnl_unlock does it's hotplug magic. | |
278 | * so hold reference to avoid race. | |
279 | */ | |
280 | dev_hold(dev); | |
281 | rtnl_unlock(); | |
282 | ||
283 | ret = br_sysfs_addbr(dev); | |
284 | dev_put(dev); | |
285 | ||
286 | if (ret) | |
287 | unregister_netdev(dev); | |
288 | out: | |
289 | return ret; | |
290 | ||
291 | err2: | |
292 | free_netdev(dev); | |
293 | err1: | |
294 | rtnl_unlock(); | |
295 | goto out; | |
296 | } | |
297 | ||
298 | int br_del_bridge(const char *name) | |
299 | { | |
300 | struct net_device *dev; | |
301 | int ret = 0; | |
302 | ||
303 | rtnl_lock(); | |
304 | dev = __dev_get_by_name(name); | |
305 | if (dev == NULL) | |
306 | ret = -ENXIO; /* Could not find device */ | |
307 | ||
308 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
309 | /* Attempt to delete non bridge device! */ | |
310 | ret = -EPERM; | |
311 | } | |
312 | ||
313 | else if (dev->flags & IFF_UP) { | |
314 | /* Not shutdown yet. */ | |
315 | ret = -EBUSY; | |
316 | } | |
317 | ||
318 | else | |
319 | del_br(netdev_priv(dev)); | |
320 | ||
321 | rtnl_unlock(); | |
322 | return ret; | |
323 | } | |
324 | ||
325 | /* Mtu of the bridge pseudo-device 1500 or the minimum of the ports */ | |
326 | int br_min_mtu(const struct net_bridge *br) | |
327 | { | |
328 | const struct net_bridge_port *p; | |
329 | int mtu = 0; | |
330 | ||
331 | ASSERT_RTNL(); | |
332 | ||
333 | if (list_empty(&br->port_list)) | |
334 | mtu = 1500; | |
335 | else { | |
336 | list_for_each_entry(p, &br->port_list, list) { | |
337 | if (!mtu || p->dev->mtu < mtu) | |
338 | mtu = p->dev->mtu; | |
339 | } | |
340 | } | |
341 | return mtu; | |
342 | } | |
343 | ||
81d35307 SH |
344 | /* |
345 | * Recomputes features using slave's features | |
346 | */ | |
347 | void br_features_recompute(struct net_bridge *br) | |
348 | { | |
349 | struct net_bridge_port *p; | |
350 | unsigned long features, checksum; | |
351 | ||
352 | features = NETIF_F_SG | NETIF_F_FRAGLIST | |
353 | | NETIF_F_HIGHDMA | NETIF_F_TSO; | |
354 | checksum = NETIF_F_IP_CSUM; /* least commmon subset */ | |
355 | ||
356 | list_for_each_entry(p, &br->port_list, list) { | |
357 | if (!(p->dev->features | |
358 | & (NETIF_F_IP_CSUM|NETIF_F_NO_CSUM|NETIF_F_HW_CSUM))) | |
359 | checksum = 0; | |
360 | features &= p->dev->features; | |
361 | } | |
362 | ||
363 | br->dev->features = features | checksum | NETIF_F_LLTX; | |
364 | } | |
365 | ||
1da177e4 LT |
366 | /* called with RTNL */ |
367 | int br_add_if(struct net_bridge *br, struct net_device *dev) | |
368 | { | |
369 | struct net_bridge_port *p; | |
370 | int err = 0; | |
371 | ||
372 | if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER) | |
373 | return -EINVAL; | |
374 | ||
375 | if (dev->hard_start_xmit == br_dev_xmit) | |
376 | return -ELOOP; | |
377 | ||
378 | if (dev->br_port != NULL) | |
379 | return -EBUSY; | |
380 | ||
4433f420 | 381 | if (IS_ERR(p = new_nbp(br, dev))) |
1da177e4 LT |
382 | return PTR_ERR(p); |
383 | ||
384 | if ((err = br_fdb_insert(br, p, dev->dev_addr))) | |
385 | destroy_nbp(p); | |
386 | ||
387 | else if ((err = br_sysfs_addif(p))) | |
388 | del_nbp(p); | |
389 | else { | |
390 | dev_set_promiscuity(dev, 1); | |
391 | ||
392 | list_add_rcu(&p->list, &br->port_list); | |
393 | ||
394 | spin_lock_bh(&br->lock); | |
395 | br_stp_recalculate_bridge_id(br); | |
133747e8 | 396 | br_features_recompute(br); |
1da177e4 LT |
397 | if ((br->dev->flags & IFF_UP) |
398 | && (dev->flags & IFF_UP) && netif_carrier_ok(dev)) | |
399 | br_stp_enable_port(p); | |
400 | spin_unlock_bh(&br->lock); | |
401 | ||
402 | dev_set_mtu(br->dev, br_min_mtu(br)); | |
403 | } | |
404 | ||
405 | return err; | |
406 | } | |
407 | ||
408 | /* called with RTNL */ | |
409 | int br_del_if(struct net_bridge *br, struct net_device *dev) | |
410 | { | |
411 | struct net_bridge_port *p = dev->br_port; | |
412 | ||
413 | if (!p || p->br != br) | |
414 | return -EINVAL; | |
415 | ||
416 | br_sysfs_removeif(p); | |
417 | del_nbp(p); | |
418 | ||
419 | spin_lock_bh(&br->lock); | |
420 | br_stp_recalculate_bridge_id(br); | |
81d35307 | 421 | br_features_recompute(br); |
1da177e4 LT |
422 | spin_unlock_bh(&br->lock); |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | void __exit br_cleanup_bridges(void) | |
428 | { | |
429 | struct net_device *dev, *nxt; | |
430 | ||
431 | rtnl_lock(); | |
432 | for (dev = dev_base; dev; dev = nxt) { | |
433 | nxt = dev->next; | |
434 | if (dev->priv_flags & IFF_EBRIDGE) | |
435 | del_br(dev->priv); | |
436 | } | |
437 | rtnl_unlock(); | |
438 | ||
439 | } |