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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 | */ | |
35 | static int br_initial_port_cost(struct net_device *dev) | |
36 | { | |
37 | ||
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); | |
50 | ||
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; | |
61 | default: | |
62 | pr_info("bridge: can't decode speed from %s: %d\n", | |
63 | dev->name, ecmd.speed); | |
64 | return 100; | |
65 | } | |
66 | } | |
67 | ||
68 | /* Old silly heuristics based on name */ | |
69 | if (!strncmp(dev->name, "lec", 3)) | |
70 | return 7; | |
71 | ||
72 | if (!strncmp(dev->name, "plip", 4)) | |
73 | return 2500; | |
74 | ||
75 | return 100; /* assume old 10Mbps */ | |
76 | } | |
77 | ||
78 | static void destroy_nbp(struct net_bridge_port *p) | |
79 | { | |
80 | struct net_device *dev = p->dev; | |
81 | ||
82 | dev->br_port = NULL; | |
83 | p->br = NULL; | |
84 | p->dev = NULL; | |
85 | dev_put(dev); | |
86 | ||
87 | br_sysfs_freeif(p); | |
88 | } | |
89 | ||
90 | static void destroy_nbp_rcu(struct rcu_head *head) | |
91 | { | |
92 | struct net_bridge_port *p = | |
93 | container_of(head, struct net_bridge_port, rcu); | |
94 | destroy_nbp(p); | |
95 | } | |
96 | ||
97 | /* called with RTNL */ | |
98 | static void del_nbp(struct net_bridge_port *p) | |
99 | { | |
100 | struct net_bridge *br = p->br; | |
101 | struct net_device *dev = p->dev; | |
102 | ||
103 | dev_set_promiscuity(dev, -1); | |
104 | ||
105 | spin_lock_bh(&br->lock); | |
106 | br_stp_disable_port(p); | |
107 | spin_unlock_bh(&br->lock); | |
108 | ||
109 | br_fdb_delete_by_port(br, p); | |
110 | ||
111 | list_del_rcu(&p->list); | |
112 | ||
113 | del_timer_sync(&p->message_age_timer); | |
114 | del_timer_sync(&p->forward_delay_timer); | |
115 | del_timer_sync(&p->hold_timer); | |
116 | ||
117 | call_rcu(&p->rcu, destroy_nbp_rcu); | |
118 | } | |
119 | ||
120 | /* called with RTNL */ | |
121 | static void del_br(struct net_bridge *br) | |
122 | { | |
123 | struct net_bridge_port *p, *n; | |
124 | ||
125 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
126 | br_sysfs_removeif(p); | |
127 | del_nbp(p); | |
128 | } | |
129 | ||
130 | del_timer_sync(&br->gc_timer); | |
131 | ||
132 | br_sysfs_delbr(br->dev); | |
133 | unregister_netdevice(br->dev); | |
134 | } | |
135 | ||
136 | static struct net_device *new_bridge_dev(const char *name) | |
137 | { | |
138 | struct net_bridge *br; | |
139 | struct net_device *dev; | |
140 | ||
141 | dev = alloc_netdev(sizeof(struct net_bridge), name, | |
142 | br_dev_setup); | |
143 | ||
144 | if (!dev) | |
145 | return NULL; | |
146 | ||
147 | br = netdev_priv(dev); | |
148 | br->dev = dev; | |
149 | ||
150 | spin_lock_init(&br->lock); | |
151 | INIT_LIST_HEAD(&br->port_list); | |
152 | spin_lock_init(&br->hash_lock); | |
153 | ||
154 | br->bridge_id.prio[0] = 0x80; | |
155 | br->bridge_id.prio[1] = 0x00; | |
156 | memset(br->bridge_id.addr, 0, ETH_ALEN); | |
157 | ||
158 | br->stp_enabled = 0; | |
159 | br->designated_root = br->bridge_id; | |
160 | br->root_path_cost = 0; | |
161 | br->root_port = 0; | |
162 | br->bridge_max_age = br->max_age = 20 * HZ; | |
163 | br->bridge_hello_time = br->hello_time = 2 * HZ; | |
164 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; | |
165 | br->topology_change = 0; | |
166 | br->topology_change_detected = 0; | |
167 | br->ageing_time = 300 * HZ; | |
168 | INIT_LIST_HEAD(&br->age_list); | |
169 | ||
170 | br_stp_timer_init(br); | |
171 | ||
172 | return dev; | |
173 | } | |
174 | ||
175 | /* find an available port number */ | |
176 | static int find_portno(struct net_bridge *br) | |
177 | { | |
178 | int index; | |
179 | struct net_bridge_port *p; | |
180 | unsigned long *inuse; | |
181 | ||
182 | inuse = kmalloc(BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long), | |
183 | GFP_KERNEL); | |
184 | if (!inuse) | |
185 | return -ENOMEM; | |
186 | ||
187 | memset(inuse, 0, BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long)); | |
188 | set_bit(0, inuse); /* zero is reserved */ | |
189 | list_for_each_entry(p, &br->port_list, list) { | |
190 | set_bit(p->port_no, inuse); | |
191 | } | |
192 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); | |
193 | kfree(inuse); | |
194 | ||
195 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; | |
196 | } | |
197 | ||
198 | /* called with RTNL */ | |
199 | static struct net_bridge_port *new_nbp(struct net_bridge *br, | |
200 | struct net_device *dev, | |
201 | unsigned long cost) | |
202 | { | |
203 | int index; | |
204 | struct net_bridge_port *p; | |
205 | ||
206 | index = find_portno(br); | |
207 | if (index < 0) | |
208 | return ERR_PTR(index); | |
209 | ||
210 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
211 | if (p == NULL) | |
212 | return ERR_PTR(-ENOMEM); | |
213 | ||
214 | memset(p, 0, sizeof(*p)); | |
215 | p->br = br; | |
216 | dev_hold(dev); | |
217 | p->dev = dev; | |
218 | p->path_cost = cost; | |
219 | p->priority = 0x8000 >> BR_PORT_BITS; | |
220 | dev->br_port = p; | |
221 | p->port_no = index; | |
222 | br_init_port(p); | |
223 | p->state = BR_STATE_DISABLED; | |
224 | kobject_init(&p->kobj); | |
225 | ||
226 | return p; | |
227 | } | |
228 | ||
229 | int br_add_bridge(const char *name) | |
230 | { | |
231 | struct net_device *dev; | |
232 | int ret; | |
233 | ||
234 | dev = new_bridge_dev(name); | |
235 | if (!dev) | |
236 | return -ENOMEM; | |
237 | ||
238 | rtnl_lock(); | |
239 | if (strchr(dev->name, '%')) { | |
240 | ret = dev_alloc_name(dev, dev->name); | |
241 | if (ret < 0) | |
242 | goto err1; | |
243 | } | |
244 | ||
245 | ret = register_netdevice(dev); | |
246 | if (ret) | |
247 | goto err2; | |
248 | ||
249 | /* network device kobject is not setup until | |
250 | * after rtnl_unlock does it's hotplug magic. | |
251 | * so hold reference to avoid race. | |
252 | */ | |
253 | dev_hold(dev); | |
254 | rtnl_unlock(); | |
255 | ||
256 | ret = br_sysfs_addbr(dev); | |
257 | dev_put(dev); | |
258 | ||
259 | if (ret) | |
260 | unregister_netdev(dev); | |
261 | out: | |
262 | return ret; | |
263 | ||
264 | err2: | |
265 | free_netdev(dev); | |
266 | err1: | |
267 | rtnl_unlock(); | |
268 | goto out; | |
269 | } | |
270 | ||
271 | int br_del_bridge(const char *name) | |
272 | { | |
273 | struct net_device *dev; | |
274 | int ret = 0; | |
275 | ||
276 | rtnl_lock(); | |
277 | dev = __dev_get_by_name(name); | |
278 | if (dev == NULL) | |
279 | ret = -ENXIO; /* Could not find device */ | |
280 | ||
281 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
282 | /* Attempt to delete non bridge device! */ | |
283 | ret = -EPERM; | |
284 | } | |
285 | ||
286 | else if (dev->flags & IFF_UP) { | |
287 | /* Not shutdown yet. */ | |
288 | ret = -EBUSY; | |
289 | } | |
290 | ||
291 | else | |
292 | del_br(netdev_priv(dev)); | |
293 | ||
294 | rtnl_unlock(); | |
295 | return ret; | |
296 | } | |
297 | ||
298 | /* Mtu of the bridge pseudo-device 1500 or the minimum of the ports */ | |
299 | int br_min_mtu(const struct net_bridge *br) | |
300 | { | |
301 | const struct net_bridge_port *p; | |
302 | int mtu = 0; | |
303 | ||
304 | ASSERT_RTNL(); | |
305 | ||
306 | if (list_empty(&br->port_list)) | |
307 | mtu = 1500; | |
308 | else { | |
309 | list_for_each_entry(p, &br->port_list, list) { | |
310 | if (!mtu || p->dev->mtu < mtu) | |
311 | mtu = p->dev->mtu; | |
312 | } | |
313 | } | |
314 | return mtu; | |
315 | } | |
316 | ||
317 | /* called with RTNL */ | |
318 | int br_add_if(struct net_bridge *br, struct net_device *dev) | |
319 | { | |
320 | struct net_bridge_port *p; | |
321 | int err = 0; | |
322 | ||
323 | if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER) | |
324 | return -EINVAL; | |
325 | ||
326 | if (dev->hard_start_xmit == br_dev_xmit) | |
327 | return -ELOOP; | |
328 | ||
329 | if (dev->br_port != NULL) | |
330 | return -EBUSY; | |
331 | ||
332 | if (IS_ERR(p = new_nbp(br, dev, br_initial_port_cost(dev)))) | |
333 | return PTR_ERR(p); | |
334 | ||
335 | if ((err = br_fdb_insert(br, p, dev->dev_addr))) | |
336 | destroy_nbp(p); | |
337 | ||
338 | else if ((err = br_sysfs_addif(p))) | |
339 | del_nbp(p); | |
340 | else { | |
341 | dev_set_promiscuity(dev, 1); | |
342 | ||
343 | list_add_rcu(&p->list, &br->port_list); | |
344 | ||
345 | spin_lock_bh(&br->lock); | |
346 | br_stp_recalculate_bridge_id(br); | |
347 | if ((br->dev->flags & IFF_UP) | |
348 | && (dev->flags & IFF_UP) && netif_carrier_ok(dev)) | |
349 | br_stp_enable_port(p); | |
350 | spin_unlock_bh(&br->lock); | |
351 | ||
352 | dev_set_mtu(br->dev, br_min_mtu(br)); | |
353 | } | |
354 | ||
355 | return err; | |
356 | } | |
357 | ||
358 | /* called with RTNL */ | |
359 | int br_del_if(struct net_bridge *br, struct net_device *dev) | |
360 | { | |
361 | struct net_bridge_port *p = dev->br_port; | |
362 | ||
363 | if (!p || p->br != br) | |
364 | return -EINVAL; | |
365 | ||
366 | br_sysfs_removeif(p); | |
367 | del_nbp(p); | |
368 | ||
369 | spin_lock_bh(&br->lock); | |
370 | br_stp_recalculate_bridge_id(br); | |
371 | spin_unlock_bh(&br->lock); | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
376 | void __exit br_cleanup_bridges(void) | |
377 | { | |
378 | struct net_device *dev, *nxt; | |
379 | ||
380 | rtnl_lock(); | |
381 | for (dev = dev_base; dev; dev = nxt) { | |
382 | nxt = dev->next; | |
383 | if (dev->priv_flags & IFF_EBRIDGE) | |
384 | del_br(dev->priv); | |
385 | } | |
386 | rtnl_unlock(); | |
387 | ||
388 | } |