netfilter: ebtables: only call xt_compat_add_offset once per rule
[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/slab.h>
19 #include <linux/times.h>
20 #include <net/net_namespace.h>
21 #include <asm/uaccess.h>
22 #include "br_private.h"
23
24 /* called with RTNL */
25 static int get_bridge_ifindices(struct net *net, int *indices, int num)
26 {
27         struct net_device *dev;
28         int i = 0;
29
30         for_each_netdev(net, 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 /* called with RTNL */
86 static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
87 {
88         struct net_device *dev;
89         int ret;
90
91         if (!capable(CAP_NET_ADMIN))
92                 return -EPERM;
93
94         dev = __dev_get_by_index(dev_net(br->dev), ifindex);
95         if (dev == NULL)
96                 return -EINVAL;
97
98         if (isadd)
99                 ret = br_add_if(br, dev);
100         else
101                 ret = br_del_if(br, dev);
102
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         {
193                 unsigned long t = clock_t_to_jiffies(args[1]);
194                 if (!capable(CAP_NET_ADMIN))
195                         return -EPERM;
196
197                 if (t < HZ)
198                         return -EINVAL;
199
200                 spin_lock_bh(&br->lock);
201                 br->bridge_hello_time = t;
202                 if (br_is_root_bridge(br))
203                         br->hello_time = br->bridge_hello_time;
204                 spin_unlock_bh(&br->lock);
205                 return 0;
206         }
207
208         case BRCTL_SET_BRIDGE_MAX_AGE:
209                 if (!capable(CAP_NET_ADMIN))
210                         return -EPERM;
211
212                 spin_lock_bh(&br->lock);
213                 br->bridge_max_age = clock_t_to_jiffies(args[1]);
214                 if (br_is_root_bridge(br))
215                         br->max_age = br->bridge_max_age;
216                 spin_unlock_bh(&br->lock);
217                 return 0;
218
219         case BRCTL_SET_AGEING_TIME:
220                 if (!capable(CAP_NET_ADMIN))
221                         return -EPERM;
222
223                 br->ageing_time = clock_t_to_jiffies(args[1]);
224                 return 0;
225
226         case BRCTL_GET_PORT_INFO:
227         {
228                 struct __port_info p;
229                 struct net_bridge_port *pt;
230
231                 rcu_read_lock();
232                 if ((pt = br_get_port(br, args[2])) == NULL) {
233                         rcu_read_unlock();
234                         return -EINVAL;
235                 }
236
237                 memset(&p, 0, sizeof(struct __port_info));
238                 memcpy(&p.designated_root, &pt->designated_root, 8);
239                 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
240                 p.port_id = pt->port_id;
241                 p.designated_port = pt->designated_port;
242                 p.path_cost = pt->path_cost;
243                 p.designated_cost = pt->designated_cost;
244                 p.state = pt->state;
245                 p.top_change_ack = pt->topology_change_ack;
246                 p.config_pending = pt->config_pending;
247                 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
248                 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
249                 p.hold_timer_value = br_timer_value(&pt->hold_timer);
250
251                 rcu_read_unlock();
252
253                 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
254                         return -EFAULT;
255
256                 return 0;
257         }
258
259         case BRCTL_SET_BRIDGE_STP_STATE:
260                 if (!capable(CAP_NET_ADMIN))
261                         return -EPERM;
262
263                 br_stp_set_enabled(br, args[1]);
264                 return 0;
265
266         case BRCTL_SET_BRIDGE_PRIORITY:
267                 if (!capable(CAP_NET_ADMIN))
268                         return -EPERM;
269
270                 spin_lock_bh(&br->lock);
271                 br_stp_set_bridge_priority(br, args[1]);
272                 spin_unlock_bh(&br->lock);
273                 return 0;
274
275         case BRCTL_SET_PORT_PRIORITY:
276         {
277                 struct net_bridge_port *p;
278                 int ret = 0;
279
280                 if (!capable(CAP_NET_ADMIN))
281                         return -EPERM;
282
283                 if (args[2] >= (1<<(16-BR_PORT_BITS)))
284                         return -ERANGE;
285
286                 spin_lock_bh(&br->lock);
287                 if ((p = br_get_port(br, args[1])) == NULL)
288                         ret = -EINVAL;
289                 else
290                         br_stp_set_port_priority(p, args[2]);
291                 spin_unlock_bh(&br->lock);
292                 return ret;
293         }
294
295         case BRCTL_SET_PATH_COST:
296         {
297                 struct net_bridge_port *p;
298                 int ret = 0;
299
300                 if (!capable(CAP_NET_ADMIN))
301                         return -EPERM;
302
303                 if ((p = br_get_port(br, args[1])) == NULL)
304                         ret = -EINVAL;
305                 else
306                         br_stp_set_path_cost(p, args[2]);
307
308                 return ret;
309         }
310
311         case BRCTL_GET_FDB_ENTRIES:
312                 return get_fdb_entries(br, (void __user *)args[1],
313                                        args[2], args[3]);
314         }
315
316         return -EOPNOTSUPP;
317 }
318
319 static int old_deviceless(struct net *net, void __user *uarg)
320 {
321         unsigned long args[3];
322
323         if (copy_from_user(args, uarg, sizeof(args)))
324                 return -EFAULT;
325
326         switch (args[0]) {
327         case BRCTL_GET_VERSION:
328                 return BRCTL_VERSION;
329
330         case BRCTL_GET_BRIDGES:
331         {
332                 int *indices;
333                 int ret = 0;
334
335                 if (args[2] >= 2048)
336                         return -ENOMEM;
337                 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
338                 if (indices == NULL)
339                         return -ENOMEM;
340
341                 args[2] = get_bridge_ifindices(net, indices, args[2]);
342
343                 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
344                         ? -EFAULT : args[2];
345
346                 kfree(indices);
347                 return ret;
348         }
349
350         case BRCTL_ADD_BRIDGE:
351         case BRCTL_DEL_BRIDGE:
352         {
353                 char buf[IFNAMSIZ];
354
355                 if (!capable(CAP_NET_ADMIN))
356                         return -EPERM;
357
358                 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
359                         return -EFAULT;
360
361                 buf[IFNAMSIZ-1] = 0;
362
363                 if (args[0] == BRCTL_ADD_BRIDGE)
364                         return br_add_bridge(net, buf);
365
366                 return br_del_bridge(net, buf);
367         }
368         }
369
370         return -EOPNOTSUPP;
371 }
372
373 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
374 {
375         switch (cmd) {
376         case SIOCGIFBR:
377         case SIOCSIFBR:
378                 return old_deviceless(net, uarg);
379
380         case SIOCBRADDBR:
381         case SIOCBRDELBR:
382         {
383                 char buf[IFNAMSIZ];
384
385                 if (!capable(CAP_NET_ADMIN))
386                         return -EPERM;
387
388                 if (copy_from_user(buf, uarg, IFNAMSIZ))
389                         return -EFAULT;
390
391                 buf[IFNAMSIZ-1] = 0;
392                 if (cmd == SIOCBRADDBR)
393                         return br_add_bridge(net, buf);
394
395                 return br_del_bridge(net, buf);
396         }
397         }
398         return -EOPNOTSUPP;
399 }
400
401 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
402 {
403         struct net_bridge *br = netdev_priv(dev);
404
405         switch(cmd) {
406         case SIOCDEVPRIVATE:
407                 return old_dev_ioctl(dev, rq, cmd);
408
409         case SIOCBRADDIF:
410         case SIOCBRDELIF:
411                 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
412
413         }
414
415         br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd);
416         return -EOPNOTSUPP;
417 }