net: Add ->neigh_lookup() operation to dst_ops
[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 compatibility.
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                 return br_set_forward_delay(br, args[1]);
185
186         case BRCTL_SET_BRIDGE_HELLO_TIME:
187                 if (!capable(CAP_NET_ADMIN))
188                         return -EPERM;
189
190                 return br_set_hello_time(br, args[1]);
191
192         case BRCTL_SET_BRIDGE_MAX_AGE:
193                 if (!capable(CAP_NET_ADMIN))
194                         return -EPERM;
195
196                 return br_set_max_age(br, args[1]);
197
198         case BRCTL_SET_AGEING_TIME:
199                 if (!capable(CAP_NET_ADMIN))
200                         return -EPERM;
201
202                 br->ageing_time = clock_t_to_jiffies(args[1]);
203                 return 0;
204
205         case BRCTL_GET_PORT_INFO:
206         {
207                 struct __port_info p;
208                 struct net_bridge_port *pt;
209
210                 rcu_read_lock();
211                 if ((pt = br_get_port(br, args[2])) == NULL) {
212                         rcu_read_unlock();
213                         return -EINVAL;
214                 }
215
216                 memset(&p, 0, sizeof(struct __port_info));
217                 memcpy(&p.designated_root, &pt->designated_root, 8);
218                 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
219                 p.port_id = pt->port_id;
220                 p.designated_port = pt->designated_port;
221                 p.path_cost = pt->path_cost;
222                 p.designated_cost = pt->designated_cost;
223                 p.state = pt->state;
224                 p.top_change_ack = pt->topology_change_ack;
225                 p.config_pending = pt->config_pending;
226                 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
227                 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
228                 p.hold_timer_value = br_timer_value(&pt->hold_timer);
229
230                 rcu_read_unlock();
231
232                 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
233                         return -EFAULT;
234
235                 return 0;
236         }
237
238         case BRCTL_SET_BRIDGE_STP_STATE:
239                 if (!capable(CAP_NET_ADMIN))
240                         return -EPERM;
241
242                 br_stp_set_enabled(br, args[1]);
243                 return 0;
244
245         case BRCTL_SET_BRIDGE_PRIORITY:
246                 if (!capable(CAP_NET_ADMIN))
247                         return -EPERM;
248
249                 spin_lock_bh(&br->lock);
250                 br_stp_set_bridge_priority(br, args[1]);
251                 spin_unlock_bh(&br->lock);
252                 return 0;
253
254         case BRCTL_SET_PORT_PRIORITY:
255         {
256                 struct net_bridge_port *p;
257                 int ret;
258
259                 if (!capable(CAP_NET_ADMIN))
260                         return -EPERM;
261
262                 spin_lock_bh(&br->lock);
263                 if ((p = br_get_port(br, args[1])) == NULL)
264                         ret = -EINVAL;
265                 else
266                         ret = br_stp_set_port_priority(p, args[2]);
267                 spin_unlock_bh(&br->lock);
268                 return ret;
269         }
270
271         case BRCTL_SET_PATH_COST:
272         {
273                 struct net_bridge_port *p;
274                 int ret;
275
276                 if (!capable(CAP_NET_ADMIN))
277                         return -EPERM;
278
279                 spin_lock_bh(&br->lock);
280                 if ((p = br_get_port(br, args[1])) == NULL)
281                         ret = -EINVAL;
282                 else
283                         ret = br_stp_set_path_cost(p, args[2]);
284                 spin_unlock_bh(&br->lock);
285
286                 return ret;
287         }
288
289         case BRCTL_GET_FDB_ENTRIES:
290                 return get_fdb_entries(br, (void __user *)args[1],
291                                        args[2], args[3]);
292         }
293
294         return -EOPNOTSUPP;
295 }
296
297 static int old_deviceless(struct net *net, void __user *uarg)
298 {
299         unsigned long args[3];
300
301         if (copy_from_user(args, uarg, sizeof(args)))
302                 return -EFAULT;
303
304         switch (args[0]) {
305         case BRCTL_GET_VERSION:
306                 return BRCTL_VERSION;
307
308         case BRCTL_GET_BRIDGES:
309         {
310                 int *indices;
311                 int ret = 0;
312
313                 if (args[2] >= 2048)
314                         return -ENOMEM;
315                 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
316                 if (indices == NULL)
317                         return -ENOMEM;
318
319                 args[2] = get_bridge_ifindices(net, indices, args[2]);
320
321                 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
322                         ? -EFAULT : args[2];
323
324                 kfree(indices);
325                 return ret;
326         }
327
328         case BRCTL_ADD_BRIDGE:
329         case BRCTL_DEL_BRIDGE:
330         {
331                 char buf[IFNAMSIZ];
332
333                 if (!capable(CAP_NET_ADMIN))
334                         return -EPERM;
335
336                 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
337                         return -EFAULT;
338
339                 buf[IFNAMSIZ-1] = 0;
340
341                 if (args[0] == BRCTL_ADD_BRIDGE)
342                         return br_add_bridge(net, buf);
343
344                 return br_del_bridge(net, buf);
345         }
346         }
347
348         return -EOPNOTSUPP;
349 }
350
351 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
352 {
353         switch (cmd) {
354         case SIOCGIFBR:
355         case SIOCSIFBR:
356                 return old_deviceless(net, uarg);
357
358         case SIOCBRADDBR:
359         case SIOCBRDELBR:
360         {
361                 char buf[IFNAMSIZ];
362
363                 if (!capable(CAP_NET_ADMIN))
364                         return -EPERM;
365
366                 if (copy_from_user(buf, uarg, IFNAMSIZ))
367                         return -EFAULT;
368
369                 buf[IFNAMSIZ-1] = 0;
370                 if (cmd == SIOCBRADDBR)
371                         return br_add_bridge(net, buf);
372
373                 return br_del_bridge(net, buf);
374         }
375         }
376         return -EOPNOTSUPP;
377 }
378
379 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
380 {
381         struct net_bridge *br = netdev_priv(dev);
382
383         switch(cmd) {
384         case SIOCDEVPRIVATE:
385                 return old_dev_ioctl(dev, rq, cmd);
386
387         case SIOCBRADDIF:
388         case SIOCBRDELIF:
389                 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
390
391         }
392
393         br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd);
394         return -EOPNOTSUPP;
395 }