net: remove CVS keywords
[linux-2.6.git] / net / bridge / br_ioctl.c
1 /*
2  *      Ioctl handler
3  *      Linux ethernet bridge
4  *
5  *      Authors:
6  *      Lennert Buytenhek               <buytenh@gnu.org>
7  *
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/capability.h>
15 #include <linux/kernel.h>
16 #include <linux/if_bridge.h>
17 #include <linux/netdevice.h>
18 #include <linux/times.h>
19 #include <net/net_namespace.h>
20 #include <asm/uaccess.h>
21 #include "br_private.h"
22
23 /* called with RTNL */
24 static int get_bridge_ifindices(int *indices, int num)
25 {
26         struct net_device *dev;
27         int i = 0;
28
29         for_each_netdev(&init_net, dev) {
30                 if (i >= num)
31                         break;
32                 if (dev->priv_flags & IFF_EBRIDGE)
33                         indices[i++] = dev->ifindex;
34         }
35
36         return i;
37 }
38
39 /* called with RTNL */
40 static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
41 {
42         struct net_bridge_port *p;
43
44         list_for_each_entry(p, &br->port_list, list) {
45                 if (p->port_no < num)
46                         ifindices[p->port_no] = p->dev->ifindex;
47         }
48 }
49
50 /*
51  * Format up to a page worth of forwarding table entries
52  * userbuf -- where to copy result
53  * maxnum  -- maximum number of entries desired
54  *            (limited to a page for sanity)
55  * offset  -- number of records to skip
56  */
57 static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
58                            unsigned long maxnum, unsigned long offset)
59 {
60         int num;
61         void *buf;
62         size_t size;
63
64         /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
65         if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
66                 maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
67
68         size = maxnum * sizeof(struct __fdb_entry);
69
70         buf = kmalloc(size, GFP_USER);
71         if (!buf)
72                 return -ENOMEM;
73
74         num = br_fdb_fillbuf(br, buf, maxnum, offset);
75         if (num > 0) {
76                 if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
77                         num = -EFAULT;
78         }
79         kfree(buf);
80
81         return num;
82 }
83
84 static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
85 {
86         struct net_device *dev;
87         int ret;
88
89         if (!capable(CAP_NET_ADMIN))
90                 return -EPERM;
91
92         dev = dev_get_by_index(&init_net, ifindex);
93         if (dev == NULL)
94                 return -EINVAL;
95
96         if (isadd)
97                 ret = br_add_if(br, dev);
98         else
99                 ret = br_del_if(br, dev);
100
101         dev_put(dev);
102         return ret;
103 }
104
105 /*
106  * Legacy ioctl's through SIOCDEVPRIVATE
107  * This interface is deprecated because it was too difficult to
108  * to do the translation for 32/64bit ioctl compatability.
109  */
110 static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
111 {
112         struct net_bridge *br = netdev_priv(dev);
113         unsigned long args[4];
114
115         if (copy_from_user(args, rq->ifr_data, sizeof(args)))
116                 return -EFAULT;
117
118         switch (args[0]) {
119         case BRCTL_ADD_IF:
120         case BRCTL_DEL_IF:
121                 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
122
123         case BRCTL_GET_BRIDGE_INFO:
124         {
125                 struct __bridge_info b;
126
127                 memset(&b, 0, sizeof(struct __bridge_info));
128                 rcu_read_lock();
129                 memcpy(&b.designated_root, &br->designated_root, 8);
130                 memcpy(&b.bridge_id, &br->bridge_id, 8);
131                 b.root_path_cost = br->root_path_cost;
132                 b.max_age = jiffies_to_clock_t(br->max_age);
133                 b.hello_time = jiffies_to_clock_t(br->hello_time);
134                 b.forward_delay = br->forward_delay;
135                 b.bridge_max_age = br->bridge_max_age;
136                 b.bridge_hello_time = br->bridge_hello_time;
137                 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
138                 b.topology_change = br->topology_change;
139                 b.topology_change_detected = br->topology_change_detected;
140                 b.root_port = br->root_port;
141
142                 b.stp_enabled = (br->stp_enabled != BR_NO_STP);
143                 b.ageing_time = jiffies_to_clock_t(br->ageing_time);
144                 b.hello_timer_value = br_timer_value(&br->hello_timer);
145                 b.tcn_timer_value = br_timer_value(&br->tcn_timer);
146                 b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
147                 b.gc_timer_value = br_timer_value(&br->gc_timer);
148                 rcu_read_unlock();
149
150                 if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
151                         return -EFAULT;
152
153                 return 0;
154         }
155
156         case BRCTL_GET_PORT_LIST:
157         {
158                 int num, *indices;
159
160                 num = args[2];
161                 if (num < 0)
162                         return -EINVAL;
163                 if (num == 0)
164                         num = 256;
165                 if (num > BR_MAX_PORTS)
166                         num = BR_MAX_PORTS;
167
168                 indices = kcalloc(num, sizeof(int), GFP_KERNEL);
169                 if (indices == NULL)
170                         return -ENOMEM;
171
172                 get_port_ifindices(br, indices, num);
173                 if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
174                         num =  -EFAULT;
175                 kfree(indices);
176                 return num;
177         }
178
179         case BRCTL_SET_BRIDGE_FORWARD_DELAY:
180                 if (!capable(CAP_NET_ADMIN))
181                         return -EPERM;
182
183                 spin_lock_bh(&br->lock);
184                 br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
185                 if (br_is_root_bridge(br))
186                         br->forward_delay = br->bridge_forward_delay;
187                 spin_unlock_bh(&br->lock);
188                 return 0;
189
190         case BRCTL_SET_BRIDGE_HELLO_TIME:
191                 if (!capable(CAP_NET_ADMIN))
192                         return -EPERM;
193
194                 spin_lock_bh(&br->lock);
195                 br->bridge_hello_time = clock_t_to_jiffies(args[1]);
196                 if (br_is_root_bridge(br))
197                         br->hello_time = br->bridge_hello_time;
198                 spin_unlock_bh(&br->lock);
199                 return 0;
200
201         case BRCTL_SET_BRIDGE_MAX_AGE:
202                 if (!capable(CAP_NET_ADMIN))
203                         return -EPERM;
204
205                 spin_lock_bh(&br->lock);
206                 br->bridge_max_age = clock_t_to_jiffies(args[1]);
207                 if (br_is_root_bridge(br))
208                         br->max_age = br->bridge_max_age;
209                 spin_unlock_bh(&br->lock);
210                 return 0;
211
212         case BRCTL_SET_AGEING_TIME:
213                 if (!capable(CAP_NET_ADMIN))
214                         return -EPERM;
215
216                 br->ageing_time = clock_t_to_jiffies(args[1]);
217                 return 0;
218
219         case BRCTL_GET_PORT_INFO:
220         {
221                 struct __port_info p;
222                 struct net_bridge_port *pt;
223
224                 rcu_read_lock();
225                 if ((pt = br_get_port(br, args[2])) == NULL) {
226                         rcu_read_unlock();
227                         return -EINVAL;
228                 }
229
230                 memset(&p, 0, sizeof(struct __port_info));
231                 memcpy(&p.designated_root, &pt->designated_root, 8);
232                 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
233                 p.port_id = pt->port_id;
234                 p.designated_port = pt->designated_port;
235                 p.path_cost = pt->path_cost;
236                 p.designated_cost = pt->designated_cost;
237                 p.state = pt->state;
238                 p.top_change_ack = pt->topology_change_ack;
239                 p.config_pending = pt->config_pending;
240                 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
241                 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
242                 p.hold_timer_value = br_timer_value(&pt->hold_timer);
243
244                 rcu_read_unlock();
245
246                 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
247                         return -EFAULT;
248
249                 return 0;
250         }
251
252         case BRCTL_SET_BRIDGE_STP_STATE:
253                 if (!capable(CAP_NET_ADMIN))
254                         return -EPERM;
255
256                 br_stp_set_enabled(br, args[1]);
257                 return 0;
258
259         case BRCTL_SET_BRIDGE_PRIORITY:
260                 if (!capable(CAP_NET_ADMIN))
261                         return -EPERM;
262
263                 spin_lock_bh(&br->lock);
264                 br_stp_set_bridge_priority(br, args[1]);
265                 spin_unlock_bh(&br->lock);
266                 return 0;
267
268         case BRCTL_SET_PORT_PRIORITY:
269         {
270                 struct net_bridge_port *p;
271                 int ret = 0;
272
273                 if (!capable(CAP_NET_ADMIN))
274                         return -EPERM;
275
276                 if (args[2] >= (1<<(16-BR_PORT_BITS)))
277                         return -ERANGE;
278
279                 spin_lock_bh(&br->lock);
280                 if ((p = br_get_port(br, args[1])) == NULL)
281                         ret = -EINVAL;
282                 else
283                         br_stp_set_port_priority(p, args[2]);
284                 spin_unlock_bh(&br->lock);
285                 return ret;
286         }
287
288         case BRCTL_SET_PATH_COST:
289         {
290                 struct net_bridge_port *p;
291                 int ret = 0;
292
293                 if (!capable(CAP_NET_ADMIN))
294                         return -EPERM;
295
296                 if ((p = br_get_port(br, args[1])) == NULL)
297                         ret = -EINVAL;
298                 else
299                         br_stp_set_path_cost(p, args[2]);
300
301                 return ret;
302         }
303
304         case BRCTL_GET_FDB_ENTRIES:
305                 return get_fdb_entries(br, (void __user *)args[1],
306                                        args[2], args[3]);
307         }
308
309         return -EOPNOTSUPP;
310 }
311
312 static int old_deviceless(void __user *uarg)
313 {
314         unsigned long args[3];
315
316         if (copy_from_user(args, uarg, sizeof(args)))
317                 return -EFAULT;
318
319         switch (args[0]) {
320         case BRCTL_GET_VERSION:
321                 return BRCTL_VERSION;
322
323         case BRCTL_GET_BRIDGES:
324         {
325                 int *indices;
326                 int ret = 0;
327
328                 if (args[2] >= 2048)
329                         return -ENOMEM;
330                 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
331                 if (indices == NULL)
332                         return -ENOMEM;
333
334                 args[2] = get_bridge_ifindices(indices, args[2]);
335
336                 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
337                         ? -EFAULT : args[2];
338
339                 kfree(indices);
340                 return ret;
341         }
342
343         case BRCTL_ADD_BRIDGE:
344         case BRCTL_DEL_BRIDGE:
345         {
346                 char buf[IFNAMSIZ];
347
348                 if (!capable(CAP_NET_ADMIN))
349                         return -EPERM;
350
351                 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
352                         return -EFAULT;
353
354                 buf[IFNAMSIZ-1] = 0;
355
356                 if (args[0] == BRCTL_ADD_BRIDGE)
357                         return br_add_bridge(buf);
358
359                 return br_del_bridge(buf);
360         }
361         }
362
363         return -EOPNOTSUPP;
364 }
365
366 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
367 {
368         switch (cmd) {
369         case SIOCGIFBR:
370         case SIOCSIFBR:
371                 return old_deviceless(uarg);
372
373         case SIOCBRADDBR:
374         case SIOCBRDELBR:
375         {
376                 char buf[IFNAMSIZ];
377
378                 if (!capable(CAP_NET_ADMIN))
379                         return -EPERM;
380
381                 if (copy_from_user(buf, uarg, IFNAMSIZ))
382                         return -EFAULT;
383
384                 buf[IFNAMSIZ-1] = 0;
385                 if (cmd == SIOCBRADDBR)
386                         return br_add_bridge(buf);
387
388                 return br_del_bridge(buf);
389         }
390         }
391         return -EOPNOTSUPP;
392 }
393
394 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
395 {
396         struct net_bridge *br = netdev_priv(dev);
397
398         switch(cmd) {
399         case SIOCDEVPRIVATE:
400                 return old_dev_ioctl(dev, rq, cmd);
401
402         case SIOCBRADDIF:
403         case SIOCBRDELIF:
404                 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
405
406         }
407
408         pr_debug("Bridge does not support ioctl 0x%x\n", cmd);
409         return -EOPNOTSUPP;
410 }