Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / net / bridge / br_ioctl.c
1 /*
2  *      Ioctl handler
3  *      Linux ethernet bridge
4  *
5  *      Authors:
6  *      Lennert Buytenhek               <buytenh@gnu.org>
7  *
8  *      $Id: br_ioctl.c,v 1.4 2000/11/08 05:16:40 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/capability.h>
17 #include <linux/kernel.h>
18 #include <linux/if_bridge.h>
19 #include <linux/netdevice.h>
20 #include <linux/times.h>
21 #include <asm/uaccess.h>
22 #include "br_private.h"
23
24 /* called with RTNL */
25 static int get_bridge_ifindices(int *indices, int num)
26 {
27         struct net_device *dev;
28         int i = 0;
29
30         for (dev = dev_base; dev && i < num; dev = dev->next) {
31                 if (dev->priv_flags & IFF_EBRIDGE)
32                         indices[i++] = dev->ifindex;
33         }
34
35         return i;
36 }
37
38 /* called with RTNL */
39 static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
40 {
41         struct net_bridge_port *p;
42
43         list_for_each_entry(p, &br->port_list, list) {
44                 if (p->port_no < num)
45                         ifindices[p->port_no] = p->dev->ifindex;
46         }
47 }
48
49 /*
50  * Format up to a page worth of forwarding table entries
51  * userbuf -- where to copy result
52  * maxnum  -- maximum number of entries desired
53  *            (limited to a page for sanity)
54  * offset  -- number of records to skip
55  */
56 static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
57                            unsigned long maxnum, unsigned long offset)
58 {
59         int num;
60         void *buf;
61         size_t size;
62
63         /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
64         if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
65                 maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
66
67         size = maxnum * sizeof(struct __fdb_entry);
68
69         buf = kmalloc(size, GFP_USER);
70         if (!buf)
71                 return -ENOMEM;
72
73         num = br_fdb_fillbuf(br, buf, maxnum, offset);
74         if (num > 0) {
75                 if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
76                         num = -EFAULT;
77         }
78         kfree(buf);
79
80         return num;
81 }
82
83 static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
84 {
85         struct net_device *dev;
86         int ret;
87
88         if (!capable(CAP_NET_ADMIN))
89                 return -EPERM;
90
91         dev = dev_get_by_index(ifindex);
92         if (dev == NULL)
93                 return -EINVAL;
94
95         if (isadd)
96                 ret = br_add_if(br, dev);
97         else
98                 ret = br_del_if(br, dev);
99
100         dev_put(dev);
101         return ret;
102 }
103
104 /*
105  * Legacy ioctl's through SIOCDEVPRIVATE
106  * This interface is deprecated because it was too difficult to
107  * to do the translation for 32/64bit ioctl compatability.
108  */
109 static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
110 {
111         struct net_bridge *br = netdev_priv(dev);
112         unsigned long args[4];
113
114         if (copy_from_user(args, rq->ifr_data, sizeof(args)))
115                 return -EFAULT;
116
117         switch (args[0]) {
118         case BRCTL_ADD_IF:
119         case BRCTL_DEL_IF:
120                 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
121
122         case BRCTL_GET_BRIDGE_INFO:
123         {
124                 struct __bridge_info b;
125
126                 memset(&b, 0, sizeof(struct __bridge_info));
127                 rcu_read_lock();
128                 memcpy(&b.designated_root, &br->designated_root, 8);
129                 memcpy(&b.bridge_id, &br->bridge_id, 8);
130                 b.root_path_cost = br->root_path_cost;
131                 b.max_age = jiffies_to_clock_t(br->max_age);
132                 b.hello_time = jiffies_to_clock_t(br->hello_time);
133                 b.forward_delay = br->forward_delay;
134                 b.bridge_max_age = br->bridge_max_age;
135                 b.bridge_hello_time = br->bridge_hello_time;
136                 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
137                 b.topology_change = br->topology_change;
138                 b.topology_change_detected = br->topology_change_detected;
139                 b.root_port = br->root_port;
140                 b.stp_enabled = br->stp_enabled;
141                 b.ageing_time = jiffies_to_clock_t(br->ageing_time);
142                 b.hello_timer_value = br_timer_value(&br->hello_timer);
143                 b.tcn_timer_value = br_timer_value(&br->tcn_timer);
144                 b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
145                 b.gc_timer_value = br_timer_value(&br->gc_timer);
146                 rcu_read_unlock();
147
148                 if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
149                         return -EFAULT;
150
151                 return 0;
152         }
153
154         case BRCTL_GET_PORT_LIST:
155         {
156                 int num, *indices;
157
158                 num = args[2];
159                 if (num < 0)
160                         return -EINVAL;
161                 if (num == 0)
162                         num = 256;
163                 if (num > BR_MAX_PORTS)
164                         num = BR_MAX_PORTS;
165
166                 indices = kcalloc(num, sizeof(int), GFP_KERNEL);
167                 if (indices == NULL)
168                         return -ENOMEM;
169
170                 get_port_ifindices(br, indices, num);
171                 if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
172                         num =  -EFAULT;
173                 kfree(indices);
174                 return num;
175         }
176
177         case BRCTL_SET_BRIDGE_FORWARD_DELAY:
178                 if (!capable(CAP_NET_ADMIN))
179                         return -EPERM;
180
181                 spin_lock_bh(&br->lock);
182                 br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
183                 if (br_is_root_bridge(br))
184                         br->forward_delay = br->bridge_forward_delay;
185                 spin_unlock_bh(&br->lock);
186                 return 0;
187
188         case BRCTL_SET_BRIDGE_HELLO_TIME:
189                 if (!capable(CAP_NET_ADMIN))
190                         return -EPERM;
191
192                 spin_lock_bh(&br->lock);
193                 br->bridge_hello_time = clock_t_to_jiffies(args[1]);
194                 if (br_is_root_bridge(br))
195                         br->hello_time = br->bridge_hello_time;
196                 spin_unlock_bh(&br->lock);
197                 return 0;
198
199         case BRCTL_SET_BRIDGE_MAX_AGE:
200                 if (!capable(CAP_NET_ADMIN))
201                         return -EPERM;
202
203                 spin_lock_bh(&br->lock);
204                 br->bridge_max_age = clock_t_to_jiffies(args[1]);
205                 if (br_is_root_bridge(br))
206                         br->max_age = br->bridge_max_age;
207                 spin_unlock_bh(&br->lock);
208                 return 0;
209
210         case BRCTL_SET_AGEING_TIME:
211                 if (!capable(CAP_NET_ADMIN))
212                         return -EPERM;
213
214                 br->ageing_time = clock_t_to_jiffies(args[1]);
215                 return 0;
216
217         case BRCTL_GET_PORT_INFO:
218         {
219                 struct __port_info p;
220                 struct net_bridge_port *pt;
221
222                 rcu_read_lock();
223                 if ((pt = br_get_port(br, args[2])) == NULL) {
224                         rcu_read_unlock();
225                         return -EINVAL;
226                 }
227
228                 memset(&p, 0, sizeof(struct __port_info));
229                 memcpy(&p.designated_root, &pt->designated_root, 8);
230                 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
231                 p.port_id = pt->port_id;
232                 p.designated_port = pt->designated_port;
233                 p.path_cost = pt->path_cost;
234                 p.designated_cost = pt->designated_cost;
235                 p.state = pt->state;
236                 p.top_change_ack = pt->topology_change_ack;
237                 p.config_pending = pt->config_pending;
238                 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
239                 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
240                 p.hold_timer_value = br_timer_value(&pt->hold_timer);
241
242                 rcu_read_unlock();
243
244                 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
245                         return -EFAULT;
246
247                 return 0;
248         }
249
250         case BRCTL_SET_BRIDGE_STP_STATE:
251                 if (!capable(CAP_NET_ADMIN))
252                         return -EPERM;
253
254                 br->stp_enabled = args[1]?1:0;
255                 return 0;
256
257         case BRCTL_SET_BRIDGE_PRIORITY:
258                 if (!capable(CAP_NET_ADMIN))
259                         return -EPERM;
260
261                 spin_lock_bh(&br->lock);
262                 br_stp_set_bridge_priority(br, args[1]);
263                 spin_unlock_bh(&br->lock);
264                 return 0;
265
266         case BRCTL_SET_PORT_PRIORITY:
267         {
268                 struct net_bridge_port *p;
269                 int ret = 0;
270
271                 if (!capable(CAP_NET_ADMIN))
272                         return -EPERM;
273
274                 if (args[2] >= (1<<(16-BR_PORT_BITS)))
275                         return -ERANGE;
276
277                 spin_lock_bh(&br->lock);
278                 if ((p = br_get_port(br, args[1])) == NULL)
279                         ret = -EINVAL;
280                 else
281                         br_stp_set_port_priority(p, args[2]);
282                 spin_unlock_bh(&br->lock);
283                 return ret;
284         }
285
286         case BRCTL_SET_PATH_COST:
287         {
288                 struct net_bridge_port *p;
289                 int ret = 0;
290
291                 if (!capable(CAP_NET_ADMIN))
292                         return -EPERM;
293
294                 spin_lock_bh(&br->lock);
295                 if ((p = br_get_port(br, args[1])) == NULL)
296                         ret = -EINVAL;
297                 else
298                         br_stp_set_path_cost(p, args[2]);
299                 spin_unlock_bh(&br->lock);
300                 return ret;
301         }
302
303         case BRCTL_GET_FDB_ENTRIES:
304                 return get_fdb_entries(br, (void __user *)args[1],
305                                        args[2], args[3]);
306         }
307
308         return -EOPNOTSUPP;
309 }
310
311 static int old_deviceless(void __user *uarg)
312 {
313         unsigned long args[3];
314
315         if (copy_from_user(args, uarg, sizeof(args)))
316                 return -EFAULT;
317
318         switch (args[0]) {
319         case BRCTL_GET_VERSION:
320                 return BRCTL_VERSION;
321
322         case BRCTL_GET_BRIDGES:
323         {
324                 int *indices;
325                 int ret = 0;
326
327                 if (args[2] >= 2048)
328                         return -ENOMEM;
329                 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
330                 if (indices == NULL)
331                         return -ENOMEM;
332
333                 args[2] = get_bridge_ifindices(indices, args[2]);
334
335                 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
336                         ? -EFAULT : args[2];
337
338                 kfree(indices);
339                 return ret;
340         }
341
342         case BRCTL_ADD_BRIDGE:
343         case BRCTL_DEL_BRIDGE:
344         {
345                 char buf[IFNAMSIZ];
346
347                 if (!capable(CAP_NET_ADMIN))
348                         return -EPERM;
349
350                 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
351                         return -EFAULT;
352
353                 buf[IFNAMSIZ-1] = 0;
354
355                 if (args[0] == BRCTL_ADD_BRIDGE)
356                         return br_add_bridge(buf);
357
358                 return br_del_bridge(buf);
359         }
360         }
361
362         return -EOPNOTSUPP;
363 }
364
365 int br_ioctl_deviceless_stub(unsigned int cmd, void __user *uarg)
366 {
367         switch (cmd) {
368         case SIOCGIFBR:
369         case SIOCSIFBR:
370                 return old_deviceless(uarg);
371
372         case SIOCBRADDBR:
373         case SIOCBRDELBR:
374         {
375                 char buf[IFNAMSIZ];
376
377                 if (!capable(CAP_NET_ADMIN))
378                         return -EPERM;
379
380                 if (copy_from_user(buf, uarg, IFNAMSIZ))
381                         return -EFAULT;
382
383                 buf[IFNAMSIZ-1] = 0;
384                 if (cmd == SIOCBRADDBR)
385                         return br_add_bridge(buf);
386
387                 return br_del_bridge(buf);
388         }
389         }
390         return -EOPNOTSUPP;
391 }
392
393 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
394 {
395         struct net_bridge *br = netdev_priv(dev);
396
397         switch(cmd) {
398         case SIOCDEVPRIVATE:
399                 return old_dev_ioctl(dev, rq, cmd);
400
401         case SIOCBRADDIF:
402         case SIOCBRDELIF:
403                 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
404
405         }
406
407         pr_debug("Bridge does not support ioctl 0x%x\n", cmd);
408         return -EOPNOTSUPP;
409 }