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Cong Wang96b45cb2013-02-15 22:20:46 +00001#include <linux/kmod.h>
2#include <linux/netdevice.h>
3#include <linux/etherdevice.h>
4#include <linux/rtnetlink.h>
5#include <linux/net_tstamp.h>
6#include <linux/wireless.h>
7#include <net/wext.h>
8
9/*
10 * Map an interface index to its name (SIOCGIFNAME)
11 */
12
13/*
14 * We need this ioctl for efficient implementation of the
15 * if_indextoname() function required by the IPv6 API. Without
16 * it, we would have to search all the interfaces to find a
17 * match. --pb
18 */
19
20static int dev_ifname(struct net *net, struct ifreq __user *arg)
21{
Cong Wang96b45cb2013-02-15 22:20:46 +000022 struct ifreq ifr;
Nicolas Schichan5dbe7c12013-06-26 17:23:42 +020023 int error;
Cong Wang96b45cb2013-02-15 22:20:46 +000024
25 /*
26 * Fetch the caller's info block.
27 */
28
29 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
30 return -EFAULT;
David S. Miller63679112017-07-19 13:33:24 -070031 ifr.ifr_name[IFNAMSIZ-1] = 0;
Cong Wang96b45cb2013-02-15 22:20:46 +000032
Nicolas Schichan5dbe7c12013-06-26 17:23:42 +020033 error = netdev_get_name(net, ifr.ifr_name, ifr.ifr_ifindex);
34 if (error)
35 return error;
Cong Wang96b45cb2013-02-15 22:20:46 +000036
37 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
38 return -EFAULT;
39 return 0;
40}
41
42static gifconf_func_t *gifconf_list[NPROTO];
43
44/**
45 * register_gifconf - register a SIOCGIF handler
46 * @family: Address family
47 * @gifconf: Function handler
48 *
49 * Register protocol dependent address dumping routines. The handler
50 * that is passed must not be freed or reused until it has been replaced
51 * by another handler.
52 */
53int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
54{
55 if (family >= NPROTO)
56 return -EINVAL;
57 gifconf_list[family] = gifconf;
58 return 0;
59}
60EXPORT_SYMBOL(register_gifconf);
61
62/*
63 * Perform a SIOCGIFCONF call. This structure will change
64 * size eventually, and there is nothing I can do about it.
65 * Thus we will need a 'compatibility mode'.
66 */
67
68static int dev_ifconf(struct net *net, char __user *arg)
69{
70 struct ifconf ifc;
71 struct net_device *dev;
72 char __user *pos;
73 int len;
74 int total;
75 int i;
76
77 /*
78 * Fetch the caller's info block.
79 */
80
81 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
82 return -EFAULT;
83
84 pos = ifc.ifc_buf;
85 len = ifc.ifc_len;
86
87 /*
88 * Loop over the interfaces, and write an info block for each.
89 */
90
91 total = 0;
92 for_each_netdev(net, dev) {
93 for (i = 0; i < NPROTO; i++) {
94 if (gifconf_list[i]) {
95 int done;
96 if (!pos)
97 done = gifconf_list[i](dev, NULL, 0);
98 else
99 done = gifconf_list[i](dev, pos + total,
100 len - total);
101 if (done < 0)
102 return -EFAULT;
103 total += done;
104 }
105 }
106 }
107
108 /*
109 * All done. Write the updated control block back to the caller.
110 */
111 ifc.ifc_len = total;
112
113 /*
114 * Both BSD and Solaris return 0 here, so we do too.
115 */
116 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
117}
118
119/*
120 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
121 */
122static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
123{
124 int err;
125 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
126
127 if (!dev)
128 return -ENODEV;
129
130 switch (cmd) {
131 case SIOCGIFFLAGS: /* Get interface flags */
132 ifr->ifr_flags = (short) dev_get_flags(dev);
133 return 0;
134
135 case SIOCGIFMETRIC: /* Get the metric on the interface
136 (currently unused) */
137 ifr->ifr_metric = 0;
138 return 0;
139
140 case SIOCGIFMTU: /* Get the MTU of a device */
141 ifr->ifr_mtu = dev->mtu;
142 return 0;
143
144 case SIOCGIFHWADDR:
145 if (!dev->addr_len)
Fabian Frederick54aeba72014-11-17 22:23:17 +0100146 memset(ifr->ifr_hwaddr.sa_data, 0,
147 sizeof(ifr->ifr_hwaddr.sa_data));
Cong Wang96b45cb2013-02-15 22:20:46 +0000148 else
149 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
Fabian Frederick54aeba72014-11-17 22:23:17 +0100150 min(sizeof(ifr->ifr_hwaddr.sa_data),
151 (size_t)dev->addr_len));
Cong Wang96b45cb2013-02-15 22:20:46 +0000152 ifr->ifr_hwaddr.sa_family = dev->type;
153 return 0;
154
155 case SIOCGIFSLAVE:
156 err = -EINVAL;
157 break;
158
159 case SIOCGIFMAP:
160 ifr->ifr_map.mem_start = dev->mem_start;
161 ifr->ifr_map.mem_end = dev->mem_end;
162 ifr->ifr_map.base_addr = dev->base_addr;
163 ifr->ifr_map.irq = dev->irq;
164 ifr->ifr_map.dma = dev->dma;
165 ifr->ifr_map.port = dev->if_port;
166 return 0;
167
168 case SIOCGIFINDEX:
169 ifr->ifr_ifindex = dev->ifindex;
170 return 0;
171
172 case SIOCGIFTXQLEN:
173 ifr->ifr_qlen = dev->tx_queue_len;
174 return 0;
175
176 default:
177 /* dev_ioctl() should ensure this case
178 * is never reached
179 */
180 WARN_ON(1);
181 err = -ENOTTY;
182 break;
183
184 }
185 return err;
186}
187
188static int net_hwtstamp_validate(struct ifreq *ifr)
189{
190 struct hwtstamp_config cfg;
191 enum hwtstamp_tx_types tx_type;
192 enum hwtstamp_rx_filters rx_filter;
193 int tx_type_valid = 0;
194 int rx_filter_valid = 0;
195
196 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
197 return -EFAULT;
198
199 if (cfg.flags) /* reserved for future extensions */
200 return -EINVAL;
201
202 tx_type = cfg.tx_type;
203 rx_filter = cfg.rx_filter;
204
205 switch (tx_type) {
206 case HWTSTAMP_TX_OFF:
207 case HWTSTAMP_TX_ON:
208 case HWTSTAMP_TX_ONESTEP_SYNC:
209 tx_type_valid = 1;
210 break;
211 }
212
213 switch (rx_filter) {
214 case HWTSTAMP_FILTER_NONE:
215 case HWTSTAMP_FILTER_ALL:
216 case HWTSTAMP_FILTER_SOME:
217 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
218 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
219 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
220 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
221 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
222 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
223 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
224 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
225 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
226 case HWTSTAMP_FILTER_PTP_V2_EVENT:
227 case HWTSTAMP_FILTER_PTP_V2_SYNC:
228 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
Miroslav Lichvarb8210a92017-05-19 17:52:35 +0200229 case HWTSTAMP_FILTER_NTP_ALL:
Miroslav Lichvare3412572017-05-19 17:52:36 +0200230 rx_filter_valid = 1;
Miroslav Lichvarb8210a92017-05-19 17:52:35 +0200231 break;
Cong Wang96b45cb2013-02-15 22:20:46 +0000232 }
233
234 if (!tx_type_valid || !rx_filter_valid)
235 return -ERANGE;
236
237 return 0;
238}
239
240/*
241 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
242 */
243static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
244{
245 int err;
246 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
247 const struct net_device_ops *ops;
248
249 if (!dev)
250 return -ENODEV;
251
252 ops = dev->netdev_ops;
253
254 switch (cmd) {
255 case SIOCSIFFLAGS: /* Set interface flags */
256 return dev_change_flags(dev, ifr->ifr_flags);
257
258 case SIOCSIFMETRIC: /* Set the metric on the interface
259 (currently unused) */
260 return -EOPNOTSUPP;
261
262 case SIOCSIFMTU: /* Set the MTU of a device */
263 return dev_set_mtu(dev, ifr->ifr_mtu);
264
265 case SIOCSIFHWADDR:
WANG Cong0254e0c2017-07-26 15:22:06 -0700266 if (dev->addr_len > sizeof(struct sockaddr))
267 return -EINVAL;
Cong Wang96b45cb2013-02-15 22:20:46 +0000268 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
269
270 case SIOCSIFHWBROADCAST:
271 if (ifr->ifr_hwaddr.sa_family != dev->type)
272 return -EINVAL;
273 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
Fabian Frederick54aeba72014-11-17 22:23:17 +0100274 min(sizeof(ifr->ifr_hwaddr.sa_data),
275 (size_t)dev->addr_len));
Cong Wang96b45cb2013-02-15 22:20:46 +0000276 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
277 return 0;
278
279 case SIOCSIFMAP:
280 if (ops->ndo_set_config) {
281 if (!netif_device_present(dev))
282 return -ENODEV;
283 return ops->ndo_set_config(dev, &ifr->ifr_map);
284 }
285 return -EOPNOTSUPP;
286
287 case SIOCADDMULTI:
288 if (!ops->ndo_set_rx_mode ||
289 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
290 return -EINVAL;
291 if (!netif_device_present(dev))
292 return -ENODEV;
293 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
294
295 case SIOCDELMULTI:
296 if (!ops->ndo_set_rx_mode ||
297 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
298 return -EINVAL;
299 if (!netif_device_present(dev))
300 return -ENODEV;
301 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
302
303 case SIOCSIFTXQLEN:
304 if (ifr->ifr_qlen < 0)
305 return -EINVAL;
Xin Long823038c2017-10-16 19:43:15 +0800306 if (dev->tx_queue_len ^ ifr->ifr_qlen) {
307 unsigned int orig_len = dev->tx_queue_len;
308
309 dev->tx_queue_len = ifr->ifr_qlen;
310 err = call_netdevice_notifiers(
311 NETDEV_CHANGE_TX_QUEUE_LEN, dev);
312 err = notifier_to_errno(err);
313 if (err) {
314 dev->tx_queue_len = orig_len;
315 return err;
316 }
317 }
Cong Wang96b45cb2013-02-15 22:20:46 +0000318 return 0;
319
320 case SIOCSIFNAME:
321 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
322 return dev_change_name(dev, ifr->ifr_newname);
323
324 case SIOCSHWTSTAMP:
325 err = net_hwtstamp_validate(ifr);
326 if (err)
327 return err;
328 /* fall through */
329
330 /*
331 * Unknown or private ioctl
332 */
333 default:
334 if ((cmd >= SIOCDEVPRIVATE &&
335 cmd <= SIOCDEVPRIVATE + 15) ||
336 cmd == SIOCBONDENSLAVE ||
337 cmd == SIOCBONDRELEASE ||
338 cmd == SIOCBONDSETHWADDR ||
339 cmd == SIOCBONDSLAVEINFOQUERY ||
340 cmd == SIOCBONDINFOQUERY ||
341 cmd == SIOCBONDCHANGEACTIVE ||
342 cmd == SIOCGMIIPHY ||
343 cmd == SIOCGMIIREG ||
344 cmd == SIOCSMIIREG ||
345 cmd == SIOCBRADDIF ||
346 cmd == SIOCBRDELIF ||
347 cmd == SIOCSHWTSTAMP ||
Ben Hutchingsfd468c72013-11-14 01:19:29 +0000348 cmd == SIOCGHWTSTAMP ||
Cong Wang96b45cb2013-02-15 22:20:46 +0000349 cmd == SIOCWANDEV) {
350 err = -EOPNOTSUPP;
351 if (ops->ndo_do_ioctl) {
352 if (netif_device_present(dev))
353 err = ops->ndo_do_ioctl(dev, ifr, cmd);
354 else
355 err = -ENODEV;
356 }
357 } else
358 err = -EINVAL;
359
360 }
361 return err;
362}
363
364/**
365 * dev_load - load a network module
366 * @net: the applicable net namespace
367 * @name: name of interface
368 *
369 * If a network interface is not present and the process has suitable
370 * privileges this function loads the module. If module loading is not
371 * available in this kernel then it becomes a nop.
372 */
373
374void dev_load(struct net *net, const char *name)
375{
376 struct net_device *dev;
377 int no_module;
378
379 rcu_read_lock();
380 dev = dev_get_by_name_rcu(net, name);
381 rcu_read_unlock();
382
383 no_module = !dev;
384 if (no_module && capable(CAP_NET_ADMIN))
385 no_module = request_module("netdev-%s", name);
Daniel Borkmanne0208362014-09-02 23:30:05 +0200386 if (no_module && capable(CAP_SYS_MODULE))
387 request_module("%s", name);
Cong Wang96b45cb2013-02-15 22:20:46 +0000388}
389EXPORT_SYMBOL(dev_load);
390
391/*
392 * This function handles all "interface"-type I/O control requests. The actual
393 * 'doing' part of this is dev_ifsioc above.
394 */
395
396/**
397 * dev_ioctl - network device ioctl
398 * @net: the applicable net namespace
399 * @cmd: command to issue
400 * @arg: pointer to a struct ifreq in user space
401 *
402 * Issue ioctl functions to devices. This is normally called by the
403 * user space syscall interfaces but can sometimes be useful for
404 * other purposes. The return value is the return from the syscall if
405 * positive or a negative errno code on error.
406 */
407
408int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
409{
410 struct ifreq ifr;
411 int ret;
412 char *colon;
413
414 /* One special case: SIOCGIFCONF takes ifconf argument
415 and requires shared lock, because it sleeps writing
416 to user space.
417 */
418
419 if (cmd == SIOCGIFCONF) {
420 rtnl_lock();
421 ret = dev_ifconf(net, (char __user *) arg);
422 rtnl_unlock();
423 return ret;
424 }
425 if (cmd == SIOCGIFNAME)
426 return dev_ifname(net, (struct ifreq __user *)arg);
427
Johannes Berg68dd02d2017-06-14 09:28:11 +0200428 /*
429 * Take care of Wireless Extensions. Unfortunately struct iwreq
430 * isn't a proper subset of struct ifreq (it's 8 byte shorter)
431 * so we need to treat it specially, otherwise applications may
432 * fault if the struct they're passing happens to land at the
433 * end of a mapped page.
434 */
435 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
436 struct iwreq iwr;
437
438 if (copy_from_user(&iwr, arg, sizeof(iwr)))
439 return -EFAULT;
440
Levin, Alexander98de4e02017-07-18 04:23:16 +0000441 iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0;
442
Johannes Berg68dd02d2017-06-14 09:28:11 +0200443 return wext_handle_ioctl(net, &iwr, cmd, arg);
444 }
445
Cong Wang96b45cb2013-02-15 22:20:46 +0000446 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
447 return -EFAULT;
448
449 ifr.ifr_name[IFNAMSIZ-1] = 0;
450
451 colon = strchr(ifr.ifr_name, ':');
452 if (colon)
453 *colon = 0;
454
455 /*
456 * See which interface the caller is talking about.
457 */
458
459 switch (cmd) {
460 /*
461 * These ioctl calls:
462 * - can be done by all.
463 * - atomic and do not require locking.
464 * - return a value
465 */
466 case SIOCGIFFLAGS:
467 case SIOCGIFMETRIC:
468 case SIOCGIFMTU:
469 case SIOCGIFHWADDR:
470 case SIOCGIFSLAVE:
471 case SIOCGIFMAP:
472 case SIOCGIFINDEX:
473 case SIOCGIFTXQLEN:
474 dev_load(net, ifr.ifr_name);
475 rcu_read_lock();
476 ret = dev_ifsioc_locked(net, &ifr, cmd);
477 rcu_read_unlock();
478 if (!ret) {
479 if (colon)
480 *colon = ':';
481 if (copy_to_user(arg, &ifr,
482 sizeof(struct ifreq)))
483 ret = -EFAULT;
484 }
485 return ret;
486
487 case SIOCETHTOOL:
488 dev_load(net, ifr.ifr_name);
489 rtnl_lock();
490 ret = dev_ethtool(net, &ifr);
491 rtnl_unlock();
492 if (!ret) {
493 if (colon)
494 *colon = ':';
495 if (copy_to_user(arg, &ifr,
496 sizeof(struct ifreq)))
497 ret = -EFAULT;
498 }
499 return ret;
500
501 /*
502 * These ioctl calls:
503 * - require superuser power.
504 * - require strict serialization.
505 * - return a value
506 */
507 case SIOCGMIIPHY:
508 case SIOCGMIIREG:
509 case SIOCSIFNAME:
510 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
511 return -EPERM;
512 dev_load(net, ifr.ifr_name);
513 rtnl_lock();
514 ret = dev_ifsioc(net, &ifr, cmd);
515 rtnl_unlock();
516 if (!ret) {
517 if (colon)
518 *colon = ':';
519 if (copy_to_user(arg, &ifr,
520 sizeof(struct ifreq)))
521 ret = -EFAULT;
522 }
523 return ret;
524
525 /*
526 * These ioctl calls:
527 * - require superuser power.
528 * - require strict serialization.
529 * - do not return a value
530 */
531 case SIOCSIFMAP:
532 case SIOCSIFTXQLEN:
533 if (!capable(CAP_NET_ADMIN))
534 return -EPERM;
535 /* fall through */
536 /*
537 * These ioctl calls:
538 * - require local superuser power.
539 * - require strict serialization.
540 * - do not return a value
541 */
542 case SIOCSIFFLAGS:
543 case SIOCSIFMETRIC:
544 case SIOCSIFMTU:
545 case SIOCSIFHWADDR:
546 case SIOCSIFSLAVE:
547 case SIOCADDMULTI:
548 case SIOCDELMULTI:
549 case SIOCSIFHWBROADCAST:
550 case SIOCSMIIREG:
551 case SIOCBONDENSLAVE:
552 case SIOCBONDRELEASE:
553 case SIOCBONDSETHWADDR:
554 case SIOCBONDCHANGEACTIVE:
555 case SIOCBRADDIF:
556 case SIOCBRDELIF:
557 case SIOCSHWTSTAMP:
558 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
559 return -EPERM;
560 /* fall through */
561 case SIOCBONDSLAVEINFOQUERY:
562 case SIOCBONDINFOQUERY:
563 dev_load(net, ifr.ifr_name);
564 rtnl_lock();
565 ret = dev_ifsioc(net, &ifr, cmd);
566 rtnl_unlock();
567 return ret;
568
569 case SIOCGIFMEM:
570 /* Get the per device memory space. We can add this but
571 * currently do not support it */
572 case SIOCSIFMEM:
573 /* Set the per device memory buffer space.
574 * Not applicable in our case */
575 case SIOCSIFLINK:
576 return -ENOTTY;
577
578 /*
579 * Unknown or private ioctl.
580 */
581 default:
582 if (cmd == SIOCWANDEV ||
Ben Hutchingsfd468c72013-11-14 01:19:29 +0000583 cmd == SIOCGHWTSTAMP ||
Cong Wang96b45cb2013-02-15 22:20:46 +0000584 (cmd >= SIOCDEVPRIVATE &&
585 cmd <= SIOCDEVPRIVATE + 15)) {
586 dev_load(net, ifr.ifr_name);
587 rtnl_lock();
588 ret = dev_ifsioc(net, &ifr, cmd);
589 rtnl_unlock();
590 if (!ret && copy_to_user(arg, &ifr,
591 sizeof(struct ifreq)))
592 ret = -EFAULT;
593 return ret;
594 }
Cong Wang96b45cb2013-02-15 22:20:46 +0000595 return -ENOTTY;
596 }
597}