Linux 4.13.16
[linux/fpc-iii.git] / net / core / dev_ioctl.c
blob709a4e6fb447fda886046308de5b613a88ff9dfa
1 #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>
9 /*
10 * Map an interface index to its name (SIOCGIFNAME)
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
20 static int dev_ifname(struct net *net, struct ifreq __user *arg)
22 struct ifreq ifr;
23 int error;
26 * Fetch the caller's info block.
29 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
30 return -EFAULT;
31 ifr.ifr_name[IFNAMSIZ-1] = 0;
33 error = netdev_get_name(net, ifr.ifr_name, ifr.ifr_ifindex);
34 if (error)
35 return error;
37 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
38 return -EFAULT;
39 return 0;
42 static gifconf_func_t *gifconf_list[NPROTO];
44 /**
45 * register_gifconf - register a SIOCGIF handler
46 * @family: Address family
47 * @gifconf: Function handler
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.
53 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
55 if (family >= NPROTO)
56 return -EINVAL;
57 gifconf_list[family] = gifconf;
58 return 0;
60 EXPORT_SYMBOL(register_gifconf);
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'.
68 static int dev_ifconf(struct net *net, char __user *arg)
70 struct ifconf ifc;
71 struct net_device *dev;
72 char __user *pos;
73 int len;
74 int total;
75 int i;
78 * Fetch the caller's info block.
81 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
82 return -EFAULT;
84 pos = ifc.ifc_buf;
85 len = ifc.ifc_len;
88 * Loop over the interfaces, and write an info block for each.
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;
109 * All done. Write the updated control block back to the caller.
111 ifc.ifc_len = total;
114 * Both BSD and Solaris return 0 here, so we do too.
116 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
120 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
122 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
124 int err;
125 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
127 if (!dev)
128 return -ENODEV;
130 switch (cmd) {
131 case SIOCGIFFLAGS: /* Get interface flags */
132 ifr->ifr_flags = (short) dev_get_flags(dev);
133 return 0;
135 case SIOCGIFMETRIC: /* Get the metric on the interface
136 (currently unused) */
137 ifr->ifr_metric = 0;
138 return 0;
140 case SIOCGIFMTU: /* Get the MTU of a device */
141 ifr->ifr_mtu = dev->mtu;
142 return 0;
144 case SIOCGIFHWADDR:
145 if (!dev->addr_len)
146 memset(ifr->ifr_hwaddr.sa_data, 0,
147 sizeof(ifr->ifr_hwaddr.sa_data));
148 else
149 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
150 min(sizeof(ifr->ifr_hwaddr.sa_data),
151 (size_t)dev->addr_len));
152 ifr->ifr_hwaddr.sa_family = dev->type;
153 return 0;
155 case SIOCGIFSLAVE:
156 err = -EINVAL;
157 break;
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;
168 case SIOCGIFINDEX:
169 ifr->ifr_ifindex = dev->ifindex;
170 return 0;
172 case SIOCGIFTXQLEN:
173 ifr->ifr_qlen = dev->tx_queue_len;
174 return 0;
176 default:
177 /* dev_ioctl() should ensure this case
178 * is never reached
180 WARN_ON(1);
181 err = -ENOTTY;
182 break;
185 return err;
188 static int net_hwtstamp_validate(struct ifreq *ifr)
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;
196 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
197 return -EFAULT;
199 if (cfg.flags) /* reserved for future extensions */
200 return -EINVAL;
202 tx_type = cfg.tx_type;
203 rx_filter = cfg.rx_filter;
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;
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:
229 case HWTSTAMP_FILTER_NTP_ALL:
230 rx_filter_valid = 1;
231 break;
234 if (!tx_type_valid || !rx_filter_valid)
235 return -ERANGE;
237 return 0;
241 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
243 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
245 int err;
246 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
247 const struct net_device_ops *ops;
249 if (!dev)
250 return -ENODEV;
252 ops = dev->netdev_ops;
254 switch (cmd) {
255 case SIOCSIFFLAGS: /* Set interface flags */
256 return dev_change_flags(dev, ifr->ifr_flags);
258 case SIOCSIFMETRIC: /* Set the metric on the interface
259 (currently unused) */
260 return -EOPNOTSUPP;
262 case SIOCSIFMTU: /* Set the MTU of a device */
263 return dev_set_mtu(dev, ifr->ifr_mtu);
265 case SIOCSIFHWADDR:
266 if (dev->addr_len > sizeof(struct sockaddr))
267 return -EINVAL;
268 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
270 case SIOCSIFHWBROADCAST:
271 if (ifr->ifr_hwaddr.sa_family != dev->type)
272 return -EINVAL;
273 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
274 min(sizeof(ifr->ifr_hwaddr.sa_data),
275 (size_t)dev->addr_len));
276 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
277 return 0;
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);
285 return -EOPNOTSUPP;
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);
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);
303 case SIOCSIFTXQLEN:
304 if (ifr->ifr_qlen < 0)
305 return -EINVAL;
306 dev->tx_queue_len = ifr->ifr_qlen;
307 return 0;
309 case SIOCSIFNAME:
310 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
311 return dev_change_name(dev, ifr->ifr_newname);
313 case SIOCSHWTSTAMP:
314 err = net_hwtstamp_validate(ifr);
315 if (err)
316 return err;
317 /* fall through */
320 * Unknown or private ioctl
322 default:
323 if ((cmd >= SIOCDEVPRIVATE &&
324 cmd <= SIOCDEVPRIVATE + 15) ||
325 cmd == SIOCBONDENSLAVE ||
326 cmd == SIOCBONDRELEASE ||
327 cmd == SIOCBONDSETHWADDR ||
328 cmd == SIOCBONDSLAVEINFOQUERY ||
329 cmd == SIOCBONDINFOQUERY ||
330 cmd == SIOCBONDCHANGEACTIVE ||
331 cmd == SIOCGMIIPHY ||
332 cmd == SIOCGMIIREG ||
333 cmd == SIOCSMIIREG ||
334 cmd == SIOCBRADDIF ||
335 cmd == SIOCBRDELIF ||
336 cmd == SIOCSHWTSTAMP ||
337 cmd == SIOCGHWTSTAMP ||
338 cmd == SIOCWANDEV) {
339 err = -EOPNOTSUPP;
340 if (ops->ndo_do_ioctl) {
341 if (netif_device_present(dev))
342 err = ops->ndo_do_ioctl(dev, ifr, cmd);
343 else
344 err = -ENODEV;
346 } else
347 err = -EINVAL;
350 return err;
354 * dev_load - load a network module
355 * @net: the applicable net namespace
356 * @name: name of interface
358 * If a network interface is not present and the process has suitable
359 * privileges this function loads the module. If module loading is not
360 * available in this kernel then it becomes a nop.
363 void dev_load(struct net *net, const char *name)
365 struct net_device *dev;
366 int no_module;
368 rcu_read_lock();
369 dev = dev_get_by_name_rcu(net, name);
370 rcu_read_unlock();
372 no_module = !dev;
373 if (no_module && capable(CAP_NET_ADMIN))
374 no_module = request_module("netdev-%s", name);
375 if (no_module && capable(CAP_SYS_MODULE))
376 request_module("%s", name);
378 EXPORT_SYMBOL(dev_load);
381 * This function handles all "interface"-type I/O control requests. The actual
382 * 'doing' part of this is dev_ifsioc above.
386 * dev_ioctl - network device ioctl
387 * @net: the applicable net namespace
388 * @cmd: command to issue
389 * @arg: pointer to a struct ifreq in user space
391 * Issue ioctl functions to devices. This is normally called by the
392 * user space syscall interfaces but can sometimes be useful for
393 * other purposes. The return value is the return from the syscall if
394 * positive or a negative errno code on error.
397 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
399 struct ifreq ifr;
400 int ret;
401 char *colon;
403 /* One special case: SIOCGIFCONF takes ifconf argument
404 and requires shared lock, because it sleeps writing
405 to user space.
408 if (cmd == SIOCGIFCONF) {
409 rtnl_lock();
410 ret = dev_ifconf(net, (char __user *) arg);
411 rtnl_unlock();
412 return ret;
414 if (cmd == SIOCGIFNAME)
415 return dev_ifname(net, (struct ifreq __user *)arg);
418 * Take care of Wireless Extensions. Unfortunately struct iwreq
419 * isn't a proper subset of struct ifreq (it's 8 byte shorter)
420 * so we need to treat it specially, otherwise applications may
421 * fault if the struct they're passing happens to land at the
422 * end of a mapped page.
424 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
425 struct iwreq iwr;
427 if (copy_from_user(&iwr, arg, sizeof(iwr)))
428 return -EFAULT;
430 iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0;
432 return wext_handle_ioctl(net, &iwr, cmd, arg);
435 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
436 return -EFAULT;
438 ifr.ifr_name[IFNAMSIZ-1] = 0;
440 colon = strchr(ifr.ifr_name, ':');
441 if (colon)
442 *colon = 0;
445 * See which interface the caller is talking about.
448 switch (cmd) {
450 * These ioctl calls:
451 * - can be done by all.
452 * - atomic and do not require locking.
453 * - return a value
455 case SIOCGIFFLAGS:
456 case SIOCGIFMETRIC:
457 case SIOCGIFMTU:
458 case SIOCGIFHWADDR:
459 case SIOCGIFSLAVE:
460 case SIOCGIFMAP:
461 case SIOCGIFINDEX:
462 case SIOCGIFTXQLEN:
463 dev_load(net, ifr.ifr_name);
464 rcu_read_lock();
465 ret = dev_ifsioc_locked(net, &ifr, cmd);
466 rcu_read_unlock();
467 if (!ret) {
468 if (colon)
469 *colon = ':';
470 if (copy_to_user(arg, &ifr,
471 sizeof(struct ifreq)))
472 ret = -EFAULT;
474 return ret;
476 case SIOCETHTOOL:
477 dev_load(net, ifr.ifr_name);
478 rtnl_lock();
479 ret = dev_ethtool(net, &ifr);
480 rtnl_unlock();
481 if (!ret) {
482 if (colon)
483 *colon = ':';
484 if (copy_to_user(arg, &ifr,
485 sizeof(struct ifreq)))
486 ret = -EFAULT;
488 return ret;
491 * These ioctl calls:
492 * - require superuser power.
493 * - require strict serialization.
494 * - return a value
496 case SIOCGMIIPHY:
497 case SIOCGMIIREG:
498 case SIOCSIFNAME:
499 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
500 return -EPERM;
501 dev_load(net, ifr.ifr_name);
502 rtnl_lock();
503 ret = dev_ifsioc(net, &ifr, cmd);
504 rtnl_unlock();
505 if (!ret) {
506 if (colon)
507 *colon = ':';
508 if (copy_to_user(arg, &ifr,
509 sizeof(struct ifreq)))
510 ret = -EFAULT;
512 return ret;
515 * These ioctl calls:
516 * - require superuser power.
517 * - require strict serialization.
518 * - do not return a value
520 case SIOCSIFMAP:
521 case SIOCSIFTXQLEN:
522 if (!capable(CAP_NET_ADMIN))
523 return -EPERM;
524 /* fall through */
526 * These ioctl calls:
527 * - require local superuser power.
528 * - require strict serialization.
529 * - do not return a value
531 case SIOCSIFFLAGS:
532 case SIOCSIFMETRIC:
533 case SIOCSIFMTU:
534 case SIOCSIFHWADDR:
535 case SIOCSIFSLAVE:
536 case SIOCADDMULTI:
537 case SIOCDELMULTI:
538 case SIOCSIFHWBROADCAST:
539 case SIOCSMIIREG:
540 case SIOCBONDENSLAVE:
541 case SIOCBONDRELEASE:
542 case SIOCBONDSETHWADDR:
543 case SIOCBONDCHANGEACTIVE:
544 case SIOCBRADDIF:
545 case SIOCBRDELIF:
546 case SIOCSHWTSTAMP:
547 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
548 return -EPERM;
549 /* fall through */
550 case SIOCBONDSLAVEINFOQUERY:
551 case SIOCBONDINFOQUERY:
552 dev_load(net, ifr.ifr_name);
553 rtnl_lock();
554 ret = dev_ifsioc(net, &ifr, cmd);
555 rtnl_unlock();
556 return ret;
558 case SIOCGIFMEM:
559 /* Get the per device memory space. We can add this but
560 * currently do not support it */
561 case SIOCSIFMEM:
562 /* Set the per device memory buffer space.
563 * Not applicable in our case */
564 case SIOCSIFLINK:
565 return -ENOTTY;
568 * Unknown or private ioctl.
570 default:
571 if (cmd == SIOCWANDEV ||
572 cmd == SIOCGHWTSTAMP ||
573 (cmd >= SIOCDEVPRIVATE &&
574 cmd <= SIOCDEVPRIVATE + 15)) {
575 dev_load(net, ifr.ifr_name);
576 rtnl_lock();
577 ret = dev_ifsioc(net, &ifr, cmd);
578 rtnl_unlock();
579 if (!ret && copy_to_user(arg, &ifr,
580 sizeof(struct ifreq)))
581 ret = -EFAULT;
582 return ret;
584 return -ENOTTY;