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