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