Merge tag 'x86-entry-2021-02-24' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / net / bridge / br_ioctl.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *      Ioctl handler
4  *      Linux ethernet bridge
5  *
6  *      Authors:
7  *      Lennert Buytenhek               <buytenh@gnu.org>
8  */
9
10 #include <linux/capability.h>
11 #include <linux/kernel.h>
12 #include <linux/if_bridge.h>
13 #include <linux/netdevice.h>
14 #include <linux/slab.h>
15 #include <linux/times.h>
16 #include <net/net_namespace.h>
17 #include <linux/uaccess.h>
18 #include "br_private.h"
19
20 static int get_bridge_ifindices(struct net *net, int *indices, int num)
21 {
22         struct net_device *dev;
23         int i = 0;
24
25         rcu_read_lock();
26         for_each_netdev_rcu(net, dev) {
27                 if (i >= num)
28                         break;
29                 if (dev->priv_flags & IFF_EBRIDGE)
30                         indices[i++] = dev->ifindex;
31         }
32         rcu_read_unlock();
33
34         return i;
35 }
36
37 /* called with RTNL */
38 static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
39 {
40         struct net_bridge_port *p;
41
42         list_for_each_entry(p, &br->port_list, list) {
43                 if (p->port_no < num)
44                         ifindices[p->port_no] = p->dev->ifindex;
45         }
46 }
47
48 /*
49  * Format up to a page worth of forwarding table entries
50  * userbuf -- where to copy result
51  * maxnum  -- maximum number of entries desired
52  *            (limited to a page for sanity)
53  * offset  -- number of records to skip
54  */
55 static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
56                            unsigned long maxnum, unsigned long offset)
57 {
58         int num;
59         void *buf;
60         size_t size;
61
62         /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
63         if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
64                 maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
65
66         size = maxnum * sizeof(struct __fdb_entry);
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 /* called with RTNL */
83 static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
84 {
85         struct net *net = dev_net(br->dev);
86         struct net_device *dev;
87         int ret;
88
89         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
90                 return -EPERM;
91
92         dev = __dev_get_by_index(net, ifindex);
93         if (dev == NULL)
94                 return -EINVAL;
95
96         if (isadd)
97                 ret = br_add_if(br, dev, NULL);
98         else
99                 ret = br_del_if(br, dev);
100
101         return ret;
102 }
103
104 /*
105  * Legacy ioctl's through SIOCDEVPRIVATE
106  * This interface is deprecated because it was too difficult
107  * to do the translation for 32/64bit ioctl compatibility.
108  */
109 static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
110 {
111         struct net_bridge *br = netdev_priv(dev);
112         struct net_bridge_port *p = NULL;
113         unsigned long args[4];
114         int ret = -EOPNOTSUPP;
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_work.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 (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
182                         return -EPERM;
183
184                 ret = br_set_forward_delay(br, args[1]);
185                 break;
186
187         case BRCTL_SET_BRIDGE_HELLO_TIME:
188                 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
189                         return -EPERM;
190
191                 ret = br_set_hello_time(br, args[1]);
192                 break;
193
194         case BRCTL_SET_BRIDGE_MAX_AGE:
195                 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
196                         return -EPERM;
197
198                 ret = br_set_max_age(br, args[1]);
199                 break;
200
201         case BRCTL_SET_AGEING_TIME:
202                 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
203                         return -EPERM;
204
205                 ret = br_set_ageing_time(br, args[1]);
206                 break;
207
208         case BRCTL_GET_PORT_INFO:
209         {
210                 struct __port_info p;
211                 struct net_bridge_port *pt;
212
213                 rcu_read_lock();
214                 if ((pt = br_get_port(br, args[2])) == NULL) {
215                         rcu_read_unlock();
216                         return -EINVAL;
217                 }
218
219                 memset(&p, 0, sizeof(struct __port_info));
220                 memcpy(&p.designated_root, &pt->designated_root, 8);
221                 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
222                 p.port_id = pt->port_id;
223                 p.designated_port = pt->designated_port;
224                 p.path_cost = pt->path_cost;
225                 p.designated_cost = pt->designated_cost;
226                 p.state = pt->state;
227                 p.top_change_ack = pt->topology_change_ack;
228                 p.config_pending = pt->config_pending;
229                 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
230                 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
231                 p.hold_timer_value = br_timer_value(&pt->hold_timer);
232
233                 rcu_read_unlock();
234
235                 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
236                         return -EFAULT;
237
238                 return 0;
239         }
240
241         case BRCTL_SET_BRIDGE_STP_STATE:
242                 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
243                         return -EPERM;
244
245                 ret = br_stp_set_enabled(br, args[1], NULL);
246                 break;
247
248         case BRCTL_SET_BRIDGE_PRIORITY:
249                 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
250                         return -EPERM;
251
252                 br_stp_set_bridge_priority(br, args[1]);
253                 ret = 0;
254                 break;
255
256         case BRCTL_SET_PORT_PRIORITY:
257         {
258                 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
259                         return -EPERM;
260
261                 spin_lock_bh(&br->lock);
262                 if ((p = br_get_port(br, args[1])) == NULL)
263                         ret = -EINVAL;
264                 else
265                         ret = br_stp_set_port_priority(p, args[2]);
266                 spin_unlock_bh(&br->lock);
267                 break;
268         }
269
270         case BRCTL_SET_PATH_COST:
271         {
272                 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
273                         return -EPERM;
274
275                 spin_lock_bh(&br->lock);
276                 if ((p = br_get_port(br, args[1])) == NULL)
277                         ret = -EINVAL;
278                 else
279                         ret = br_stp_set_path_cost(p, args[2]);
280                 spin_unlock_bh(&br->lock);
281                 break;
282         }
283
284         case BRCTL_GET_FDB_ENTRIES:
285                 return get_fdb_entries(br, (void __user *)args[1],
286                                        args[2], args[3]);
287         }
288
289         if (!ret) {
290                 if (p)
291                         br_ifinfo_notify(RTM_NEWLINK, NULL, p);
292                 else
293                         netdev_state_change(br->dev);
294         }
295
296         return ret;
297 }
298
299 static int old_deviceless(struct net *net, void __user *uarg)
300 {
301         unsigned long args[3];
302
303         if (copy_from_user(args, uarg, sizeof(args)))
304                 return -EFAULT;
305
306         switch (args[0]) {
307         case BRCTL_GET_VERSION:
308                 return BRCTL_VERSION;
309
310         case BRCTL_GET_BRIDGES:
311         {
312                 int *indices;
313                 int ret = 0;
314
315                 if (args[2] >= 2048)
316                         return -ENOMEM;
317                 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
318                 if (indices == NULL)
319                         return -ENOMEM;
320
321                 args[2] = get_bridge_ifindices(net, indices, args[2]);
322
323                 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
324                         ? -EFAULT : args[2];
325
326                 kfree(indices);
327                 return ret;
328         }
329
330         case BRCTL_ADD_BRIDGE:
331         case BRCTL_DEL_BRIDGE:
332         {
333                 char buf[IFNAMSIZ];
334
335                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
336                         return -EPERM;
337
338                 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
339                         return -EFAULT;
340
341                 buf[IFNAMSIZ-1] = 0;
342
343                 if (args[0] == BRCTL_ADD_BRIDGE)
344                         return br_add_bridge(net, buf);
345
346                 return br_del_bridge(net, buf);
347         }
348         }
349
350         return -EOPNOTSUPP;
351 }
352
353 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
354 {
355         switch (cmd) {
356         case SIOCGIFBR:
357         case SIOCSIFBR:
358                 return old_deviceless(net, uarg);
359
360         case SIOCBRADDBR:
361         case SIOCBRDELBR:
362         {
363                 char buf[IFNAMSIZ];
364
365                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
366                         return -EPERM;
367
368                 if (copy_from_user(buf, uarg, IFNAMSIZ))
369                         return -EFAULT;
370
371                 buf[IFNAMSIZ-1] = 0;
372                 if (cmd == SIOCBRADDBR)
373                         return br_add_bridge(net, buf);
374
375                 return br_del_bridge(net, buf);
376         }
377         }
378         return -EOPNOTSUPP;
379 }
380
381 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
382 {
383         struct net_bridge *br = netdev_priv(dev);
384
385         switch (cmd) {
386         case SIOCDEVPRIVATE:
387                 return old_dev_ioctl(dev, rq, cmd);
388
389         case SIOCBRADDIF:
390         case SIOCBRDELIF:
391                 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
392
393         }
394
395         br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd);
396         return -EOPNOTSUPP;
397 }