Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Ioctl handler | |
4 | * Linux ethernet bridge | |
5 | * | |
6 | * Authors: | |
7 | * Lennert Buytenhek <buytenh@gnu.org> | |
1da177e4 LT |
8 | */ |
9 | ||
4fc268d2 | 10 | #include <linux/capability.h> |
1da177e4 LT |
11 | #include <linux/kernel.h> |
12 | #include <linux/if_bridge.h> | |
13 | #include <linux/netdevice.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
1da177e4 | 15 | #include <linux/times.h> |
881d966b | 16 | #include <net/net_namespace.h> |
7c0f6ba6 | 17 | #include <linux/uaccess.h> |
1da177e4 LT |
18 | #include "br_private.h" |
19 | ||
4aa678ba | 20 | static int get_bridge_ifindices(struct net *net, int *indices, int num) |
1da177e4 LT |
21 | { |
22 | struct net_device *dev; | |
23 | int i = 0; | |
24 | ||
31ca0458 NA |
25 | rcu_read_lock(); |
26 | for_each_netdev_rcu(net, dev) { | |
7562f876 PE |
27 | if (i >= num) |
28 | break; | |
254ec036 | 29 | if (netif_is_bridge_master(dev)) |
1da177e4 LT |
30 | indices[i++] = dev->ifindex; |
31 | } | |
31ca0458 | 32 | rcu_read_unlock(); |
1da177e4 LT |
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 | */ | |
9d6f229f | 55 | static int get_fdb_entries(struct net_bridge *br, void __user *userbuf, |
1da177e4 LT |
56 | unsigned long maxnum, unsigned long offset) |
57 | { | |
58 | int num; | |
59 | void *buf; | |
ba8379b2 | 60 | size_t size; |
1da177e4 | 61 | |
ba8379b2 CW |
62 | /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */ |
63 | if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry)) | |
1da177e4 | 64 | maxnum = PAGE_SIZE/sizeof(struct __fdb_entry); |
ba8379b2 CW |
65 | |
66 | size = maxnum * sizeof(struct __fdb_entry); | |
1da177e4 LT |
67 | |
68 | buf = kmalloc(size, GFP_USER); | |
69 | if (!buf) | |
70 | return -ENOMEM; | |
9d6f229f | 71 | |
1da177e4 LT |
72 | num = br_fdb_fillbuf(br, buf, maxnum, offset); |
73 | if (num > 0) { | |
865bfb2a GS |
74 | if (copy_to_user(userbuf, buf, |
75 | array_size(num, sizeof(struct __fdb_entry)))) | |
1da177e4 LT |
76 | num = -EFAULT; |
77 | } | |
78 | kfree(buf); | |
79 | ||
80 | return num; | |
81 | } | |
82 | ||
31ef30c7 | 83 | /* called with RTNL */ |
1da177e4 LT |
84 | static int add_del_if(struct net_bridge *br, int ifindex, int isadd) |
85 | { | |
cb990503 | 86 | struct net *net = dev_net(br->dev); |
1da177e4 LT |
87 | struct net_device *dev; |
88 | int ret; | |
89 | ||
cb990503 | 90 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
91 | return -EPERM; |
92 | ||
cb990503 | 93 | dev = __dev_get_by_index(net, ifindex); |
1da177e4 LT |
94 | if (dev == NULL) |
95 | return -EINVAL; | |
9d6f229f | 96 | |
1da177e4 | 97 | if (isadd) |
ca752be0 | 98 | ret = br_add_if(br, dev, NULL); |
eccaa9e5 | 99 | else |
1da177e4 LT |
100 | ret = br_del_if(br, dev); |
101 | ||
1da177e4 LT |
102 | return ret; |
103 | } | |
104 | ||
105 | /* | |
106 | * Legacy ioctl's through SIOCDEVPRIVATE | |
4bbd026c | 107 | * This interface is deprecated because it was too difficult |
25985edc | 108 | * to do the translation for 32/64bit ioctl compatibility. |
1da177e4 | 109 | */ |
561d8352 | 110 | int br_dev_siocdevprivate(struct net_device *dev, struct ifreq *rq, void __user *data, int cmd) |
1da177e4 LT |
111 | { |
112 | struct net_bridge *br = netdev_priv(dev); | |
bf871ad7 | 113 | struct net_bridge_port *p = NULL; |
1da177e4 | 114 | unsigned long args[4]; |
561d8352 | 115 | void __user *argp; |
bf871ad7 | 116 | int ret = -EOPNOTSUPP; |
9d6f229f | 117 | |
561d8352 AB |
118 | if (in_compat_syscall()) { |
119 | unsigned int cargs[4]; | |
120 | ||
121 | if (copy_from_user(cargs, data, sizeof(cargs))) | |
122 | return -EFAULT; | |
123 | ||
124 | args[0] = cargs[0]; | |
125 | args[1] = cargs[1]; | |
126 | args[2] = cargs[2]; | |
127 | args[3] = cargs[3]; | |
128 | ||
129 | argp = compat_ptr(args[1]); | |
130 | } else { | |
131 | if (copy_from_user(args, data, sizeof(args))) | |
132 | return -EFAULT; | |
133 | ||
134 | argp = (void __user *)args[1]; | |
135 | } | |
1da177e4 LT |
136 | |
137 | switch (args[0]) { | |
138 | case BRCTL_ADD_IF: | |
139 | case BRCTL_DEL_IF: | |
140 | return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF); | |
141 | ||
142 | case BRCTL_GET_BRIDGE_INFO: | |
143 | { | |
144 | struct __bridge_info b; | |
145 | ||
146 | memset(&b, 0, sizeof(struct __bridge_info)); | |
147 | rcu_read_lock(); | |
148 | memcpy(&b.designated_root, &br->designated_root, 8); | |
149 | memcpy(&b.bridge_id, &br->bridge_id, 8); | |
150 | b.root_path_cost = br->root_path_cost; | |
151 | b.max_age = jiffies_to_clock_t(br->max_age); | |
152 | b.hello_time = jiffies_to_clock_t(br->hello_time); | |
153 | b.forward_delay = br->forward_delay; | |
154 | b.bridge_max_age = br->bridge_max_age; | |
155 | b.bridge_hello_time = br->bridge_hello_time; | |
156 | b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay); | |
157 | b.topology_change = br->topology_change; | |
158 | b.topology_change_detected = br->topology_change_detected; | |
159 | b.root_port = br->root_port; | |
9cde0708 SH |
160 | |
161 | b.stp_enabled = (br->stp_enabled != BR_NO_STP); | |
1da177e4 LT |
162 | b.ageing_time = jiffies_to_clock_t(br->ageing_time); |
163 | b.hello_timer_value = br_timer_value(&br->hello_timer); | |
164 | b.tcn_timer_value = br_timer_value(&br->tcn_timer); | |
165 | b.topology_change_timer_value = br_timer_value(&br->topology_change_timer); | |
f7cdee8a | 166 | b.gc_timer_value = br_timer_value(&br->gc_work.timer); |
9d6f229f | 167 | rcu_read_unlock(); |
1da177e4 LT |
168 | |
169 | if (copy_to_user((void __user *)args[1], &b, sizeof(b))) | |
170 | return -EFAULT; | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | case BRCTL_GET_PORT_LIST: | |
176 | { | |
177 | int num, *indices; | |
178 | ||
179 | num = args[2]; | |
180 | if (num < 0) | |
181 | return -EINVAL; | |
182 | if (num == 0) | |
183 | num = 256; | |
184 | if (num > BR_MAX_PORTS) | |
185 | num = BR_MAX_PORTS; | |
186 | ||
0da974f4 | 187 | indices = kcalloc(num, sizeof(int), GFP_KERNEL); |
1da177e4 LT |
188 | if (indices == NULL) |
189 | return -ENOMEM; | |
190 | ||
1da177e4 | 191 | get_port_ifindices(br, indices, num); |
865bfb2a | 192 | if (copy_to_user(argp, indices, array_size(num, sizeof(int)))) |
1da177e4 LT |
193 | num = -EFAULT; |
194 | kfree(indices); | |
195 | return num; | |
196 | } | |
197 | ||
198 | case BRCTL_SET_BRIDGE_FORWARD_DELAY: | |
cb990503 | 199 | if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
200 | return -EPERM; |
201 | ||
bf871ad7 XL |
202 | ret = br_set_forward_delay(br, args[1]); |
203 | break; | |
1da177e4 LT |
204 | |
205 | case BRCTL_SET_BRIDGE_HELLO_TIME: | |
cb990503 | 206 | if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
207 | return -EPERM; |
208 | ||
bf871ad7 XL |
209 | ret = br_set_hello_time(br, args[1]); |
210 | break; | |
1da177e4 LT |
211 | |
212 | case BRCTL_SET_BRIDGE_MAX_AGE: | |
cb990503 | 213 | if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
214 | return -EPERM; |
215 | ||
bf871ad7 XL |
216 | ret = br_set_max_age(br, args[1]); |
217 | break; | |
1da177e4 LT |
218 | |
219 | case BRCTL_SET_AGEING_TIME: | |
cb990503 | 220 | if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
221 | return -EPERM; |
222 | ||
bf871ad7 XL |
223 | ret = br_set_ageing_time(br, args[1]); |
224 | break; | |
1da177e4 LT |
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 | ||
561d8352 | 253 | if (copy_to_user(argp, &p, sizeof(p))) |
1da177e4 LT |
254 | return -EFAULT; |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | case BRCTL_SET_BRIDGE_STP_STATE: | |
cb990503 | 260 | if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
261 | return -EPERM; |
262 | ||
419dba8a | 263 | ret = br_stp_set_enabled(br, args[1], NULL); |
bf871ad7 | 264 | break; |
1da177e4 LT |
265 | |
266 | case BRCTL_SET_BRIDGE_PRIORITY: | |
cb990503 | 267 | if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
268 | return -EPERM; |
269 | ||
1da177e4 | 270 | br_stp_set_bridge_priority(br, args[1]); |
bf871ad7 XL |
271 | ret = 0; |
272 | break; | |
1da177e4 LT |
273 | |
274 | case BRCTL_SET_PORT_PRIORITY: | |
275 | { | |
cb990503 | 276 | if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
277 | return -EPERM; |
278 | ||
1da177e4 | 279 | spin_lock_bh(&br->lock); |
9d6f229f | 280 | if ((p = br_get_port(br, args[1])) == NULL) |
1da177e4 LT |
281 | ret = -EINVAL; |
282 | else | |
14f98f25 | 283 | ret = br_stp_set_port_priority(p, args[2]); |
1da177e4 | 284 | spin_unlock_bh(&br->lock); |
bf871ad7 | 285 | break; |
1da177e4 LT |
286 | } |
287 | ||
288 | case BRCTL_SET_PATH_COST: | |
289 | { | |
cb990503 | 290 | if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
291 | return -EPERM; |
292 | ||
14f98f25 | 293 | spin_lock_bh(&br->lock); |
1da177e4 LT |
294 | if ((p = br_get_port(br, args[1])) == NULL) |
295 | ret = -EINVAL; | |
296 | else | |
14f98f25 | 297 | ret = br_stp_set_path_cost(p, args[2]); |
298 | spin_unlock_bh(&br->lock); | |
bf871ad7 | 299 | break; |
1da177e4 LT |
300 | } |
301 | ||
302 | case BRCTL_GET_FDB_ENTRIES: | |
561d8352 | 303 | return get_fdb_entries(br, argp, args[2], args[3]); |
1da177e4 LT |
304 | } |
305 | ||
bf871ad7 XL |
306 | if (!ret) { |
307 | if (p) | |
92899063 | 308 | br_ifinfo_notify(RTM_NEWLINK, NULL, p); |
bf871ad7 XL |
309 | else |
310 | netdev_state_change(br->dev); | |
311 | } | |
312 | ||
313 | return ret; | |
1da177e4 LT |
314 | } |
315 | ||
4aa678ba | 316 | static int old_deviceless(struct net *net, void __user *uarg) |
1da177e4 LT |
317 | { |
318 | unsigned long args[3]; | |
319 | ||
320 | if (copy_from_user(args, uarg, sizeof(args))) | |
321 | return -EFAULT; | |
322 | ||
323 | switch (args[0]) { | |
324 | case BRCTL_GET_VERSION: | |
325 | return BRCTL_VERSION; | |
326 | ||
327 | case BRCTL_GET_BRIDGES: | |
328 | { | |
329 | int *indices; | |
330 | int ret = 0; | |
331 | ||
332 | if (args[2] >= 2048) | |
333 | return -ENOMEM; | |
0da974f4 | 334 | indices = kcalloc(args[2], sizeof(int), GFP_KERNEL); |
1da177e4 LT |
335 | if (indices == NULL) |
336 | return -ENOMEM; | |
337 | ||
4aa678ba | 338 | args[2] = get_bridge_ifindices(net, indices, args[2]); |
1da177e4 | 339 | |
865bfb2a GS |
340 | ret = copy_to_user(uarg, indices, |
341 | array_size(args[2], sizeof(int))) | |
1da177e4 LT |
342 | ? -EFAULT : args[2]; |
343 | ||
344 | kfree(indices); | |
345 | return ret; | |
346 | } | |
347 | ||
348 | case BRCTL_ADD_BRIDGE: | |
349 | case BRCTL_DEL_BRIDGE: | |
350 | { | |
351 | char buf[IFNAMSIZ]; | |
352 | ||
cb990503 | 353 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
354 | return -EPERM; |
355 | ||
cbd7ad29 | 356 | if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ)) |
1da177e4 LT |
357 | return -EFAULT; |
358 | ||
359 | buf[IFNAMSIZ-1] = 0; | |
360 | ||
361 | if (args[0] == BRCTL_ADD_BRIDGE) | |
4aa678ba | 362 | return br_add_bridge(net, buf); |
1da177e4 | 363 | |
4aa678ba | 364 | return br_del_bridge(net, buf); |
1da177e4 LT |
365 | } |
366 | } | |
367 | ||
368 | return -EOPNOTSUPP; | |
369 | } | |
370 | ||
ad2f99ae AB |
371 | int br_ioctl_stub(struct net *net, struct net_bridge *br, unsigned int cmd, |
372 | struct ifreq *ifr, void __user *uarg) | |
1da177e4 | 373 | { |
893b1958 NA |
374 | int ret = -EOPNOTSUPP; |
375 | ||
376 | rtnl_lock(); | |
377 | ||
1da177e4 LT |
378 | switch (cmd) { |
379 | case SIOCGIFBR: | |
380 | case SIOCSIFBR: | |
893b1958 NA |
381 | ret = old_deviceless(net, uarg); |
382 | break; | |
1da177e4 LT |
383 | case SIOCBRADDBR: |
384 | case SIOCBRDELBR: | |
385 | { | |
386 | char buf[IFNAMSIZ]; | |
387 | ||
893b1958 NA |
388 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) { |
389 | ret = -EPERM; | |
390 | break; | |
391 | } | |
1da177e4 | 392 | |
893b1958 NA |
393 | if (copy_from_user(buf, uarg, IFNAMSIZ)) { |
394 | ret = -EFAULT; | |
395 | break; | |
396 | } | |
1da177e4 LT |
397 | |
398 | buf[IFNAMSIZ-1] = 0; | |
399 | if (cmd == SIOCBRADDBR) | |
893b1958 NA |
400 | ret = br_add_bridge(net, buf); |
401 | else | |
402 | ret = br_del_bridge(net, buf); | |
1da177e4 | 403 | } |
893b1958 | 404 | break; |
1da177e4 LT |
405 | case SIOCBRADDIF: |
406 | case SIOCBRDELIF: | |
893b1958 NA |
407 | ret = add_del_if(br, ifr->ifr_ifindex, cmd == SIOCBRADDIF); |
408 | break; | |
1da177e4 | 409 | } |
893b1958 NA |
410 | |
411 | rtnl_unlock(); | |
412 | ||
413 | return ret; | |
1da177e4 | 414 | } |