Loading...
Note: File does not exist in v3.5.6.
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/kmod.h>
3#include <linux/netdevice.h>
4#include <linux/etherdevice.h>
5#include <linux/rtnetlink.h>
6#include <linux/net_tstamp.h>
7#include <linux/wireless.h>
8#include <net/wext.h>
9
10/*
11 * Map an interface index to its name (SIOCGIFNAME)
12 */
13
14/*
15 * We need this ioctl for efficient implementation of the
16 * if_indextoname() function required by the IPv6 API. Without
17 * it, we would have to search all the interfaces to find a
18 * match. --pb
19 */
20
21static int dev_ifname(struct net *net, struct ifreq *ifr)
22{
23 ifr->ifr_name[IFNAMSIZ-1] = 0;
24 return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
25}
26
27static gifconf_func_t *gifconf_list[NPROTO];
28
29/**
30 * register_gifconf - register a SIOCGIF handler
31 * @family: Address family
32 * @gifconf: Function handler
33 *
34 * Register protocol dependent address dumping routines. The handler
35 * that is passed must not be freed or reused until it has been replaced
36 * by another handler.
37 */
38int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
39{
40 if (family >= NPROTO)
41 return -EINVAL;
42 gifconf_list[family] = gifconf;
43 return 0;
44}
45EXPORT_SYMBOL(register_gifconf);
46
47/*
48 * Perform a SIOCGIFCONF call. This structure will change
49 * size eventually, and there is nothing I can do about it.
50 * Thus we will need a 'compatibility mode'.
51 */
52
53int dev_ifconf(struct net *net, struct ifconf *ifc, int size)
54{
55 struct net_device *dev;
56 char __user *pos;
57 int len;
58 int total;
59 int i;
60
61 /*
62 * Fetch the caller's info block.
63 */
64
65 pos = ifc->ifc_buf;
66 len = ifc->ifc_len;
67
68 /*
69 * Loop over the interfaces, and write an info block for each.
70 */
71
72 total = 0;
73 for_each_netdev(net, dev) {
74 for (i = 0; i < NPROTO; i++) {
75 if (gifconf_list[i]) {
76 int done;
77 if (!pos)
78 done = gifconf_list[i](dev, NULL, 0, size);
79 else
80 done = gifconf_list[i](dev, pos + total,
81 len - total, size);
82 if (done < 0)
83 return -EFAULT;
84 total += done;
85 }
86 }
87 }
88
89 /*
90 * All done. Write the updated control block back to the caller.
91 */
92 ifc->ifc_len = total;
93
94 /*
95 * Both BSD and Solaris return 0 here, so we do too.
96 */
97 return 0;
98}
99
100/*
101 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
102 */
103static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
104{
105 int err;
106 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
107
108 if (!dev)
109 return -ENODEV;
110
111 switch (cmd) {
112 case SIOCGIFFLAGS: /* Get interface flags */
113 ifr->ifr_flags = (short) dev_get_flags(dev);
114 return 0;
115
116 case SIOCGIFMETRIC: /* Get the metric on the interface
117 (currently unused) */
118 ifr->ifr_metric = 0;
119 return 0;
120
121 case SIOCGIFMTU: /* Get the MTU of a device */
122 ifr->ifr_mtu = dev->mtu;
123 return 0;
124
125 case SIOCGIFHWADDR:
126 if (!dev->addr_len)
127 memset(ifr->ifr_hwaddr.sa_data, 0,
128 sizeof(ifr->ifr_hwaddr.sa_data));
129 else
130 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
131 min(sizeof(ifr->ifr_hwaddr.sa_data),
132 (size_t)dev->addr_len));
133 ifr->ifr_hwaddr.sa_family = dev->type;
134 return 0;
135
136 case SIOCGIFSLAVE:
137 err = -EINVAL;
138 break;
139
140 case SIOCGIFMAP:
141 ifr->ifr_map.mem_start = dev->mem_start;
142 ifr->ifr_map.mem_end = dev->mem_end;
143 ifr->ifr_map.base_addr = dev->base_addr;
144 ifr->ifr_map.irq = dev->irq;
145 ifr->ifr_map.dma = dev->dma;
146 ifr->ifr_map.port = dev->if_port;
147 return 0;
148
149 case SIOCGIFINDEX:
150 ifr->ifr_ifindex = dev->ifindex;
151 return 0;
152
153 case SIOCGIFTXQLEN:
154 ifr->ifr_qlen = dev->tx_queue_len;
155 return 0;
156
157 default:
158 /* dev_ioctl() should ensure this case
159 * is never reached
160 */
161 WARN_ON(1);
162 err = -ENOTTY;
163 break;
164
165 }
166 return err;
167}
168
169static int net_hwtstamp_validate(struct ifreq *ifr)
170{
171 struct hwtstamp_config cfg;
172 enum hwtstamp_tx_types tx_type;
173 enum hwtstamp_rx_filters rx_filter;
174 int tx_type_valid = 0;
175 int rx_filter_valid = 0;
176
177 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
178 return -EFAULT;
179
180 if (cfg.flags) /* reserved for future extensions */
181 return -EINVAL;
182
183 tx_type = cfg.tx_type;
184 rx_filter = cfg.rx_filter;
185
186 switch (tx_type) {
187 case HWTSTAMP_TX_OFF:
188 case HWTSTAMP_TX_ON:
189 case HWTSTAMP_TX_ONESTEP_SYNC:
190 tx_type_valid = 1;
191 break;
192 }
193
194 switch (rx_filter) {
195 case HWTSTAMP_FILTER_NONE:
196 case HWTSTAMP_FILTER_ALL:
197 case HWTSTAMP_FILTER_SOME:
198 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
199 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
200 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
201 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
202 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
203 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
204 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
205 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
206 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
207 case HWTSTAMP_FILTER_PTP_V2_EVENT:
208 case HWTSTAMP_FILTER_PTP_V2_SYNC:
209 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
210 case HWTSTAMP_FILTER_NTP_ALL:
211 rx_filter_valid = 1;
212 break;
213 }
214
215 if (!tx_type_valid || !rx_filter_valid)
216 return -ERANGE;
217
218 return 0;
219}
220
221/*
222 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
223 */
224static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
225{
226 int err;
227 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
228 const struct net_device_ops *ops;
229
230 if (!dev)
231 return -ENODEV;
232
233 ops = dev->netdev_ops;
234
235 switch (cmd) {
236 case SIOCSIFFLAGS: /* Set interface flags */
237 return dev_change_flags(dev, ifr->ifr_flags, NULL);
238
239 case SIOCSIFMETRIC: /* Set the metric on the interface
240 (currently unused) */
241 return -EOPNOTSUPP;
242
243 case SIOCSIFMTU: /* Set the MTU of a device */
244 return dev_set_mtu(dev, ifr->ifr_mtu);
245
246 case SIOCSIFHWADDR:
247 if (dev->addr_len > sizeof(struct sockaddr))
248 return -EINVAL;
249 return dev_set_mac_address(dev, &ifr->ifr_hwaddr, NULL);
250
251 case SIOCSIFHWBROADCAST:
252 if (ifr->ifr_hwaddr.sa_family != dev->type)
253 return -EINVAL;
254 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
255 min(sizeof(ifr->ifr_hwaddr.sa_data),
256 (size_t)dev->addr_len));
257 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
258 return 0;
259
260 case SIOCSIFMAP:
261 if (ops->ndo_set_config) {
262 if (!netif_device_present(dev))
263 return -ENODEV;
264 return ops->ndo_set_config(dev, &ifr->ifr_map);
265 }
266 return -EOPNOTSUPP;
267
268 case SIOCADDMULTI:
269 if (!ops->ndo_set_rx_mode ||
270 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
271 return -EINVAL;
272 if (!netif_device_present(dev))
273 return -ENODEV;
274 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
275
276 case SIOCDELMULTI:
277 if (!ops->ndo_set_rx_mode ||
278 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
279 return -EINVAL;
280 if (!netif_device_present(dev))
281 return -ENODEV;
282 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
283
284 case SIOCSIFTXQLEN:
285 if (ifr->ifr_qlen < 0)
286 return -EINVAL;
287 return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
288
289 case SIOCSIFNAME:
290 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
291 return dev_change_name(dev, ifr->ifr_newname);
292
293 case SIOCSHWTSTAMP:
294 err = net_hwtstamp_validate(ifr);
295 if (err)
296 return err;
297 /* fall through */
298
299 /*
300 * Unknown or private ioctl
301 */
302 default:
303 if ((cmd >= SIOCDEVPRIVATE &&
304 cmd <= SIOCDEVPRIVATE + 15) ||
305 cmd == SIOCBONDENSLAVE ||
306 cmd == SIOCBONDRELEASE ||
307 cmd == SIOCBONDSETHWADDR ||
308 cmd == SIOCBONDSLAVEINFOQUERY ||
309 cmd == SIOCBONDINFOQUERY ||
310 cmd == SIOCBONDCHANGEACTIVE ||
311 cmd == SIOCGMIIPHY ||
312 cmd == SIOCGMIIREG ||
313 cmd == SIOCSMIIREG ||
314 cmd == SIOCBRADDIF ||
315 cmd == SIOCBRDELIF ||
316 cmd == SIOCSHWTSTAMP ||
317 cmd == SIOCGHWTSTAMP ||
318 cmd == SIOCWANDEV) {
319 err = -EOPNOTSUPP;
320 if (ops->ndo_do_ioctl) {
321 if (netif_device_present(dev))
322 err = ops->ndo_do_ioctl(dev, ifr, cmd);
323 else
324 err = -ENODEV;
325 }
326 } else
327 err = -EINVAL;
328
329 }
330 return err;
331}
332
333/**
334 * dev_load - load a network module
335 * @net: the applicable net namespace
336 * @name: name of interface
337 *
338 * If a network interface is not present and the process has suitable
339 * privileges this function loads the module. If module loading is not
340 * available in this kernel then it becomes a nop.
341 */
342
343void dev_load(struct net *net, const char *name)
344{
345 struct net_device *dev;
346 int no_module;
347
348 rcu_read_lock();
349 dev = dev_get_by_name_rcu(net, name);
350 rcu_read_unlock();
351
352 no_module = !dev;
353 if (no_module && capable(CAP_NET_ADMIN))
354 no_module = request_module("netdev-%s", name);
355 if (no_module && capable(CAP_SYS_MODULE))
356 request_module("%s", name);
357}
358EXPORT_SYMBOL(dev_load);
359
360/*
361 * This function handles all "interface"-type I/O control requests. The actual
362 * 'doing' part of this is dev_ifsioc above.
363 */
364
365/**
366 * dev_ioctl - network device ioctl
367 * @net: the applicable net namespace
368 * @cmd: command to issue
369 * @ifr: pointer to a struct ifreq in user space
370 * @need_copyout: whether or not copy_to_user() should be called
371 *
372 * Issue ioctl functions to devices. This is normally called by the
373 * user space syscall interfaces but can sometimes be useful for
374 * other purposes. The return value is the return from the syscall if
375 * positive or a negative errno code on error.
376 */
377
378int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_copyout)
379{
380 int ret;
381 char *colon;
382
383 if (need_copyout)
384 *need_copyout = true;
385 if (cmd == SIOCGIFNAME)
386 return dev_ifname(net, ifr);
387
388 ifr->ifr_name[IFNAMSIZ-1] = 0;
389
390 colon = strchr(ifr->ifr_name, ':');
391 if (colon)
392 *colon = 0;
393
394 /*
395 * See which interface the caller is talking about.
396 */
397
398 switch (cmd) {
399 /*
400 * These ioctl calls:
401 * - can be done by all.
402 * - atomic and do not require locking.
403 * - return a value
404 */
405 case SIOCGIFFLAGS:
406 case SIOCGIFMETRIC:
407 case SIOCGIFMTU:
408 case SIOCGIFHWADDR:
409 case SIOCGIFSLAVE:
410 case SIOCGIFMAP:
411 case SIOCGIFINDEX:
412 case SIOCGIFTXQLEN:
413 dev_load(net, ifr->ifr_name);
414 rcu_read_lock();
415 ret = dev_ifsioc_locked(net, ifr, cmd);
416 rcu_read_unlock();
417 if (colon)
418 *colon = ':';
419 return ret;
420
421 case SIOCETHTOOL:
422 dev_load(net, ifr->ifr_name);
423 rtnl_lock();
424 ret = dev_ethtool(net, ifr);
425 rtnl_unlock();
426 if (colon)
427 *colon = ':';
428 return ret;
429
430 /*
431 * These ioctl calls:
432 * - require superuser power.
433 * - require strict serialization.
434 * - return a value
435 */
436 case SIOCGMIIPHY:
437 case SIOCGMIIREG:
438 case SIOCSIFNAME:
439 dev_load(net, ifr->ifr_name);
440 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
441 return -EPERM;
442 rtnl_lock();
443 ret = dev_ifsioc(net, ifr, cmd);
444 rtnl_unlock();
445 if (colon)
446 *colon = ':';
447 return ret;
448
449 /*
450 * These ioctl calls:
451 * - require superuser power.
452 * - require strict serialization.
453 * - do not return a value
454 */
455 case SIOCSIFMAP:
456 case SIOCSIFTXQLEN:
457 if (!capable(CAP_NET_ADMIN))
458 return -EPERM;
459 /* fall through */
460 /*
461 * These ioctl calls:
462 * - require local superuser power.
463 * - require strict serialization.
464 * - do not return a value
465 */
466 case SIOCSIFFLAGS:
467 case SIOCSIFMETRIC:
468 case SIOCSIFMTU:
469 case SIOCSIFHWADDR:
470 case SIOCSIFSLAVE:
471 case SIOCADDMULTI:
472 case SIOCDELMULTI:
473 case SIOCSIFHWBROADCAST:
474 case SIOCSMIIREG:
475 case SIOCBONDENSLAVE:
476 case SIOCBONDRELEASE:
477 case SIOCBONDSETHWADDR:
478 case SIOCBONDCHANGEACTIVE:
479 case SIOCBRADDIF:
480 case SIOCBRDELIF:
481 case SIOCSHWTSTAMP:
482 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
483 return -EPERM;
484 /* fall through */
485 case SIOCBONDSLAVEINFOQUERY:
486 case SIOCBONDINFOQUERY:
487 dev_load(net, ifr->ifr_name);
488 rtnl_lock();
489 ret = dev_ifsioc(net, ifr, cmd);
490 rtnl_unlock();
491 if (need_copyout)
492 *need_copyout = false;
493 return ret;
494
495 case SIOCGIFMEM:
496 /* Get the per device memory space. We can add this but
497 * currently do not support it */
498 case SIOCSIFMEM:
499 /* Set the per device memory buffer space.
500 * Not applicable in our case */
501 case SIOCSIFLINK:
502 return -ENOTTY;
503
504 /*
505 * Unknown or private ioctl.
506 */
507 default:
508 if (cmd == SIOCWANDEV ||
509 cmd == SIOCGHWTSTAMP ||
510 (cmd >= SIOCDEVPRIVATE &&
511 cmd <= SIOCDEVPRIVATE + 15)) {
512 dev_load(net, ifr->ifr_name);
513 rtnl_lock();
514 ret = dev_ifsioc(net, ifr, cmd);
515 rtnl_unlock();
516 return ret;
517 }
518 return -ENOTTY;
519 }
520}