[MIPS] Fix CONFIG_BUILD_ELF64 kernels with symbols in CKSEG0.
[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_each_netdev(dev) {
31                 if (i >= num)
32                         break;
33                 if (dev->priv_flags & IFF_EBRIDGE)
34                         indices[i++] = dev->ifindex;
35         }
36
37         return i;
38 }
39
40 /* called with RTNL */
41 static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
42 {
43         struct net_bridge_port *p;
44
45         list_for_each_entry(p, &br->port_list, list) {
46                 if (p->port_no < num)
47                         ifindices[p->port_no] = p->dev->ifindex;
48         }
49 }
50
51 /*
52  * Format up to a page worth of forwarding table entries
53  * userbuf -- where to copy result
54  * maxnum  -- maximum number of entries desired
55  *            (limited to a page for sanity)
56  * offset  -- number of records to skip
57  */
58 static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
59                            unsigned long maxnum, unsigned long offset)
60 {
61         int num;
62         void *buf;
63         size_t size;
64
65         /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
66         if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
67                 maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
68
69         size = maxnum * sizeof(struct __fdb_entry);
70
71         buf = kmalloc(size, GFP_USER);
72         if (!buf)
73                 return -ENOMEM;
74
75         num = br_fdb_fillbuf(br, buf, maxnum, offset);
76         if (num > 0) {
77                 if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
78                         num = -EFAULT;
79         }
80         kfree(buf);
81
82         return num;
83 }
84
85 static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
86 {
87         struct net_device *dev;
88         int ret;
89
90         if (!capable(CAP_NET_ADMIN))
91                 return -EPERM;
92
93         dev = dev_get_by_index(ifindex);
94         if (dev == NULL)
95                 return -EINVAL;
96
97         if (isadd)
98                 ret = br_add_if(br, dev);
99         else
100                 ret = br_del_if(br, dev);
101
102         dev_put(dev);
103         return ret;
104 }
105
106 /*
107  * Legacy ioctl's through SIOCDEVPRIVATE
108  * This interface is deprecated because it was too difficult to
109  * to do the translation for 32/64bit ioctl compatability.
110  */
111 static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
112 {
113         struct net_bridge *br = netdev_priv(dev);
114         unsigned long args[4];
115
116         if (copy_from_user(args, rq->ifr_data, sizeof(args)))
117                 return -EFAULT;
118
119         switch (args[0]) {
120         case BRCTL_ADD_IF:
121         case BRCTL_DEL_IF:
122                 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
123
124         case BRCTL_GET_BRIDGE_INFO:
125         {
126                 struct __bridge_info b;
127
128                 memset(&b, 0, sizeof(struct __bridge_info));
129                 rcu_read_lock();
130                 memcpy(&b.designated_root, &br->designated_root, 8);
131                 memcpy(&b.bridge_id, &br->bridge_id, 8);
132                 b.root_path_cost = br->root_path_cost;
133                 b.max_age = jiffies_to_clock_t(br->max_age);
134                 b.hello_time = jiffies_to_clock_t(br->hello_time);
135                 b.forward_delay = br->forward_delay;
136                 b.bridge_max_age = br->bridge_max_age;
137                 b.bridge_hello_time = br->bridge_hello_time;
138                 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
139                 b.topology_change = br->topology_change;
140                 b.topology_change_detected = br->topology_change_detected;
141                 b.root_port = br->root_port;
142
143                 b.stp_enabled = (br->stp_enabled != BR_NO_STP);
144                 b.ageing_time = jiffies_to_clock_t(br->ageing_time);
145                 b.hello_timer_value = br_timer_value(&br->hello_timer);
146                 b.tcn_timer_value = br_timer_value(&br->tcn_timer);
147                 b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
148                 b.gc_timer_value = br_timer_value(&br->gc_timer);
149                 rcu_read_unlock();
150
151                 if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
152                         return -EFAULT;
153
154                 return 0;
155         }
156
157         case BRCTL_GET_PORT_LIST:
158         {
159                 int num, *indices;
160
161                 num = args[2];
162                 if (num < 0)
163                         return -EINVAL;
164                 if (num == 0)
165                         num = 256;
166                 if (num > BR_MAX_PORTS)
167                         num = BR_MAX_PORTS;
168
169                 indices = kcalloc(num, sizeof(int), GFP_KERNEL);
170                 if (indices == NULL)
171                         return -ENOMEM;
172
173                 get_port_ifindices(br, indices, num);
174                 if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
175                         num =  -EFAULT;
176                 kfree(indices);
177                 return num;
178         }
179
180         case BRCTL_SET_BRIDGE_FORWARD_DELAY:
181                 if (!capable(CAP_NET_ADMIN))
182                         return -EPERM;
183
184                 spin_lock_bh(&br->lock);
185                 br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
186                 if (br_is_root_bridge(br))
187                         br->forward_delay = br->bridge_forward_delay;
188                 spin_unlock_bh(&br->lock);
189                 return 0;
190
191         case BRCTL_SET_BRIDGE_HELLO_TIME:
192                 if (!capable(CAP_NET_ADMIN))
193                         return -EPERM;
194
195                 spin_lock_bh(&br->lock);
196                 br->bridge_hello_time = clock_t_to_jiffies(args[1]);
197                 if (br_is_root_bridge(br))
198                         br->hello_time = br->bridge_hello_time;
199                 spin_unlock_bh(&br->lock);
200                 return 0;
201
202         case BRCTL_SET_BRIDGE_MAX_AGE:
203                 if (!capable(CAP_NET_ADMIN))
204                         return -EPERM;
205
206                 spin_lock_bh(&br->lock);
207                 br->bridge_max_age = clock_t_to_jiffies(args[1]);
208                 if (br_is_root_bridge(br))
209                         br->max_age = br->bridge_max_age;
210                 spin_unlock_bh(&br->lock);
211                 return 0;
212
213         case BRCTL_SET_AGEING_TIME:
214                 if (!capable(CAP_NET_ADMIN))
215                         return -EPERM;
216
217                 br->ageing_time = clock_t_to_jiffies(args[1]);
218                 return 0;
219
220         case BRCTL_GET_PORT_INFO:
221         {
222                 struct __port_info p;
223                 struct net_bridge_port *pt;
224
225                 rcu_read_lock();
226                 if ((pt = br_get_port(br, args[2])) == NULL) {
227                         rcu_read_unlock();
228                         return -EINVAL;
229                 }
230
231                 memset(&p, 0, sizeof(struct __port_info));
232                 memcpy(&p.designated_root, &pt->designated_root, 8);
233                 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
234                 p.port_id = pt->port_id;
235                 p.designated_port = pt->designated_port;
236                 p.path_cost = pt->path_cost;
237                 p.designated_cost = pt->designated_cost;
238                 p.state = pt->state;
239                 p.top_change_ack = pt->topology_change_ack;
240                 p.config_pending = pt->config_pending;
241                 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
242                 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
243                 p.hold_timer_value = br_timer_value(&pt->hold_timer);
244
245                 rcu_read_unlock();
246
247                 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
248                         return -EFAULT;
249
250                 return 0;
251         }
252
253         case BRCTL_SET_BRIDGE_STP_STATE:
254                 if (!capable(CAP_NET_ADMIN))
255                         return -EPERM;
256
257                 br_stp_set_enabled(br, args[1]);
258                 return 0;
259
260         case BRCTL_SET_BRIDGE_PRIORITY:
261                 if (!capable(CAP_NET_ADMIN))
262                         return -EPERM;
263
264                 spin_lock_bh(&br->lock);
265                 br_stp_set_bridge_priority(br, args[1]);
266                 spin_unlock_bh(&br->lock);
267                 return 0;
268
269         case BRCTL_SET_PORT_PRIORITY:
270         {
271                 struct net_bridge_port *p;
272                 int ret = 0;
273
274                 if (!capable(CAP_NET_ADMIN))
275                         return -EPERM;
276
277                 if (args[2] >= (1<<(16-BR_PORT_BITS)))
278                         return -ERANGE;
279
280                 spin_lock_bh(&br->lock);
281                 if ((p = br_get_port(br, args[1])) == NULL)
282                         ret = -EINVAL;
283                 else
284                         br_stp_set_port_priority(p, args[2]);
285                 spin_unlock_bh(&br->lock);
286                 return ret;
287         }
288
289         case BRCTL_SET_PATH_COST:
290         {
291                 struct net_bridge_port *p;
292                 int ret = 0;
293
294                 if (!capable(CAP_NET_ADMIN))
295                         return -EPERM;
296
297                 if ((p = br_get_port(br, args[1])) == NULL)
298                         ret = -EINVAL;
299                 else
300                         br_stp_set_path_cost(p, args[2]);
301
302                 return ret;
303         }
304
305         case BRCTL_GET_FDB_ENTRIES:
306                 return get_fdb_entries(br, (void __user *)args[1],
307                                        args[2], args[3]);
308         }
309
310         return -EOPNOTSUPP;
311 }
312
313 static int old_deviceless(void __user *uarg)
314 {
315         unsigned long args[3];
316
317         if (copy_from_user(args, uarg, sizeof(args)))
318                 return -EFAULT;
319
320         switch (args[0]) {
321         case BRCTL_GET_VERSION:
322                 return BRCTL_VERSION;
323
324         case BRCTL_GET_BRIDGES:
325         {
326                 int *indices;
327                 int ret = 0;
328
329                 if (args[2] >= 2048)
330                         return -ENOMEM;
331                 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
332                 if (indices == NULL)
333                         return -ENOMEM;
334
335                 args[2] = get_bridge_ifindices(indices, args[2]);
336
337                 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
338                         ? -EFAULT : args[2];
339
340                 kfree(indices);
341                 return ret;
342         }
343
344         case BRCTL_ADD_BRIDGE:
345         case BRCTL_DEL_BRIDGE:
346         {
347                 char buf[IFNAMSIZ];
348
349                 if (!capable(CAP_NET_ADMIN))
350                         return -EPERM;
351
352                 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
353                         return -EFAULT;
354
355                 buf[IFNAMSIZ-1] = 0;
356
357                 if (args[0] == BRCTL_ADD_BRIDGE)
358                         return br_add_bridge(buf);
359
360                 return br_del_bridge(buf);
361         }
362         }
363
364         return -EOPNOTSUPP;
365 }
366
367 int br_ioctl_deviceless_stub(unsigned int cmd, void __user *uarg)
368 {
369         switch (cmd) {
370         case SIOCGIFBR:
371         case SIOCSIFBR:
372                 return old_deviceless(uarg);
373
374         case SIOCBRADDBR:
375         case SIOCBRDELBR:
376         {
377                 char buf[IFNAMSIZ];
378
379                 if (!capable(CAP_NET_ADMIN))
380                         return -EPERM;
381
382                 if (copy_from_user(buf, uarg, IFNAMSIZ))
383                         return -EFAULT;
384
385                 buf[IFNAMSIZ-1] = 0;
386                 if (cmd == SIOCBRADDBR)
387                         return br_add_bridge(buf);
388
389                 return br_del_bridge(buf);
390         }
391         }
392         return -EOPNOTSUPP;
393 }
394
395 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
396 {
397         struct net_bridge *br = netdev_priv(dev);
398
399         switch(cmd) {
400         case SIOCDEVPRIVATE:
401                 return old_dev_ioctl(dev, rq, cmd);
402
403         case SIOCBRADDIF:
404         case SIOCBRDELIF:
405                 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
406
407         }
408
409         pr_debug("Bridge does not support ioctl 0x%x\n", cmd);
410         return -EOPNOTSUPP;
411 }