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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>
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{
22 struct ifreq ifr;
23 int error;
24
25 /*
26 * Fetch the caller's info block.
27 */
28
29 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
30 return -EFAULT;
31
32 error = netdev_get_name(net, ifr.ifr_name, ifr.ifr_ifindex);
33 if (error)
34 return error;
35
36 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
37 return -EFAULT;
38 return 0;
39}
40
41static gifconf_func_t *gifconf_list[NPROTO];
42
43/**
44 * register_gifconf - register a SIOCGIF handler
45 * @family: Address family
46 * @gifconf: Function handler
47 *
48 * Register protocol dependent address dumping routines. The handler
49 * that is passed must not be freed or reused until it has been replaced
50 * by another handler.
51 */
52int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
53{
54 if (family >= NPROTO)
55 return -EINVAL;
56 gifconf_list[family] = gifconf;
57 return 0;
58}
59EXPORT_SYMBOL(register_gifconf);
60
61/*
62 * Perform a SIOCGIFCONF call. This structure will change
63 * size eventually, and there is nothing I can do about it.
64 * Thus we will need a 'compatibility mode'.
65 */
66
67static int dev_ifconf(struct net *net, char __user *arg)
68{
69 struct ifconf ifc;
70 struct net_device *dev;
71 char __user *pos;
72 int len;
73 int total;
74 int i;
75
76 /*
77 * Fetch the caller's info block.
78 */
79
80 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
81 return -EFAULT;
82
83 pos = ifc.ifc_buf;
84 len = ifc.ifc_len;
85
86 /*
87 * Loop over the interfaces, and write an info block for each.
88 */
89
90 total = 0;
91 for_each_netdev(net, dev) {
92 for (i = 0; i < NPROTO; i++) {
93 if (gifconf_list[i]) {
94 int done;
95 if (!pos)
96 done = gifconf_list[i](dev, NULL, 0);
97 else
98 done = gifconf_list[i](dev, pos + total,
99 len - total);
100 if (done < 0)
101 return -EFAULT;
102 total += done;
103 }
104 }
105 }
106
107 /*
108 * All done. Write the updated control block back to the caller.
109 */
110 ifc.ifc_len = total;
111
112 /*
113 * Both BSD and Solaris return 0 here, so we do too.
114 */
115 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
116}
117
118/*
119 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
120 */
121static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
122{
123 int err;
124 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
125
126 if (!dev)
127 return -ENODEV;
128
129 switch (cmd) {
130 case SIOCGIFFLAGS: /* Get interface flags */
131 ifr->ifr_flags = (short) dev_get_flags(dev);
132 return 0;
133
134 case SIOCGIFMETRIC: /* Get the metric on the interface
135 (currently unused) */
136 ifr->ifr_metric = 0;
137 return 0;
138
139 case SIOCGIFMTU: /* Get the MTU of a device */
140 ifr->ifr_mtu = dev->mtu;
141 return 0;
142
143 case SIOCGIFHWADDR:
144 if (!dev->addr_len)
145 memset(ifr->ifr_hwaddr.sa_data, 0,
146 sizeof(ifr->ifr_hwaddr.sa_data));
147 else
148 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
149 min(sizeof(ifr->ifr_hwaddr.sa_data),
150 (size_t)dev->addr_len));
151 ifr->ifr_hwaddr.sa_family = dev->type;
152 return 0;
153
154 case SIOCGIFSLAVE:
155 err = -EINVAL;
156 break;
157
158 case SIOCGIFMAP:
159 ifr->ifr_map.mem_start = dev->mem_start;
160 ifr->ifr_map.mem_end = dev->mem_end;
161 ifr->ifr_map.base_addr = dev->base_addr;
162 ifr->ifr_map.irq = dev->irq;
163 ifr->ifr_map.dma = dev->dma;
164 ifr->ifr_map.port = dev->if_port;
165 return 0;
166
167 case SIOCGIFINDEX:
168 ifr->ifr_ifindex = dev->ifindex;
169 return 0;
170
171 case SIOCGIFTXQLEN:
172 ifr->ifr_qlen = dev->tx_queue_len;
173 return 0;
174
175 default:
176 /* dev_ioctl() should ensure this case
177 * is never reached
178 */
179 WARN_ON(1);
180 err = -ENOTTY;
181 break;
182
183 }
184 return err;
185}
186
187static int net_hwtstamp_validate(struct ifreq *ifr)
188{
189 struct hwtstamp_config cfg;
190 enum hwtstamp_tx_types tx_type;
191 enum hwtstamp_rx_filters rx_filter;
192 int tx_type_valid = 0;
193 int rx_filter_valid = 0;
194
195 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
196 return -EFAULT;
197
198 if (cfg.flags) /* reserved for future extensions */
199 return -EINVAL;
200
201 tx_type = cfg.tx_type;
202 rx_filter = cfg.rx_filter;
203
204 switch (tx_type) {
205 case HWTSTAMP_TX_OFF:
206 case HWTSTAMP_TX_ON:
207 case HWTSTAMP_TX_ONESTEP_SYNC:
208 tx_type_valid = 1;
209 break;
210 }
211
212 switch (rx_filter) {
213 case HWTSTAMP_FILTER_NONE:
214 case HWTSTAMP_FILTER_ALL:
215 case HWTSTAMP_FILTER_SOME:
216 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
217 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
218 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
219 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
220 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
221 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
222 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
223 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
224 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
225 case HWTSTAMP_FILTER_PTP_V2_EVENT:
226 case HWTSTAMP_FILTER_PTP_V2_SYNC:
227 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
228 rx_filter_valid = 1;
229 break;
230 }
231
232 if (!tx_type_valid || !rx_filter_valid)
233 return -ERANGE;
234
235 return 0;
236}
237
238/*
239 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
240 */
241static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
242{
243 int err;
244 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
245 const struct net_device_ops *ops;
246
247 if (!dev)
248 return -ENODEV;
249
250 ops = dev->netdev_ops;
251
252 switch (cmd) {
253 case SIOCSIFFLAGS: /* Set interface flags */
254 return dev_change_flags(dev, ifr->ifr_flags);
255
256 case SIOCSIFMETRIC: /* Set the metric on the interface
257 (currently unused) */
258 return -EOPNOTSUPP;
259
260 case SIOCSIFMTU: /* Set the MTU of a device */
261 return dev_set_mtu(dev, ifr->ifr_mtu);
262
263 case SIOCSIFHWADDR:
264 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
265
266 case SIOCSIFHWBROADCAST:
267 if (ifr->ifr_hwaddr.sa_family != dev->type)
268 return -EINVAL;
269 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
270 min(sizeof(ifr->ifr_hwaddr.sa_data),
271 (size_t)dev->addr_len));
272 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
273 return 0;
274
275 case SIOCSIFMAP:
276 if (ops->ndo_set_config) {
277 if (!netif_device_present(dev))
278 return -ENODEV;
279 return ops->ndo_set_config(dev, &ifr->ifr_map);
280 }
281 return -EOPNOTSUPP;
282
283 case SIOCADDMULTI:
284 if (!ops->ndo_set_rx_mode ||
285 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
286 return -EINVAL;
287 if (!netif_device_present(dev))
288 return -ENODEV;
289 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
290
291 case SIOCDELMULTI:
292 if (!ops->ndo_set_rx_mode ||
293 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
294 return -EINVAL;
295 if (!netif_device_present(dev))
296 return -ENODEV;
297 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
298
299 case SIOCSIFTXQLEN:
300 if (ifr->ifr_qlen < 0)
301 return -EINVAL;
302 dev->tx_queue_len = ifr->ifr_qlen;
303 return 0;
304
305 case SIOCSIFNAME:
306 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
307 return dev_change_name(dev, ifr->ifr_newname);
308
309 case SIOCSHWTSTAMP:
310 err = net_hwtstamp_validate(ifr);
311 if (err)
312 return err;
313 /* fall through */
314
315 /*
316 * Unknown or private ioctl
317 */
318 default:
319 if ((cmd >= SIOCDEVPRIVATE &&
320 cmd <= SIOCDEVPRIVATE + 15) ||
321 cmd == SIOCBONDENSLAVE ||
322 cmd == SIOCBONDRELEASE ||
323 cmd == SIOCBONDSETHWADDR ||
324 cmd == SIOCBONDSLAVEINFOQUERY ||
325 cmd == SIOCBONDINFOQUERY ||
326 cmd == SIOCBONDCHANGEACTIVE ||
327 cmd == SIOCGMIIPHY ||
328 cmd == SIOCGMIIREG ||
329 cmd == SIOCSMIIREG ||
330 cmd == SIOCBRADDIF ||
331 cmd == SIOCBRDELIF ||
332 cmd == SIOCSHWTSTAMP ||
333 cmd == SIOCGHWTSTAMP ||
334 cmd == SIOCWANDEV) {
335 err = -EOPNOTSUPP;
336 if (ops->ndo_do_ioctl) {
337 if (netif_device_present(dev))
338 err = ops->ndo_do_ioctl(dev, ifr, cmd);
339 else
340 err = -ENODEV;
341 }
342 } else
343 err = -EINVAL;
344
345 }
346 return err;
347}
348
349/**
350 * dev_load - load a network module
351 * @net: the applicable net namespace
352 * @name: name of interface
353 *
354 * If a network interface is not present and the process has suitable
355 * privileges this function loads the module. If module loading is not
356 * available in this kernel then it becomes a nop.
357 */
358
359void dev_load(struct net *net, const char *name)
360{
361 struct net_device *dev;
362 int no_module;
363
364 rcu_read_lock();
365 dev = dev_get_by_name_rcu(net, name);
366 rcu_read_unlock();
367
368 no_module = !dev;
369 if (no_module && capable(CAP_NET_ADMIN))
370 no_module = request_module("netdev-%s", name);
371 if (no_module && capable(CAP_SYS_MODULE))
372 request_module("%s", name);
373}
374EXPORT_SYMBOL(dev_load);
375
376/*
377 * This function handles all "interface"-type I/O control requests. The actual
378 * 'doing' part of this is dev_ifsioc above.
379 */
380
381/**
382 * dev_ioctl - network device ioctl
383 * @net: the applicable net namespace
384 * @cmd: command to issue
385 * @arg: pointer to a struct ifreq in user space
386 *
387 * Issue ioctl functions to devices. This is normally called by the
388 * user space syscall interfaces but can sometimes be useful for
389 * other purposes. The return value is the return from the syscall if
390 * positive or a negative errno code on error.
391 */
392
393int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
394{
395 struct ifreq ifr;
396 int ret;
397 char *colon;
398
399 /* One special case: SIOCGIFCONF takes ifconf argument
400 and requires shared lock, because it sleeps writing
401 to user space.
402 */
403
404 if (cmd == SIOCGIFCONF) {
405 rtnl_lock();
406 ret = dev_ifconf(net, (char __user *) arg);
407 rtnl_unlock();
408 return ret;
409 }
410 if (cmd == SIOCGIFNAME)
411 return dev_ifname(net, (struct ifreq __user *)arg);
412
413 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
414 return -EFAULT;
415
416 ifr.ifr_name[IFNAMSIZ-1] = 0;
417
418 colon = strchr(ifr.ifr_name, ':');
419 if (colon)
420 *colon = 0;
421
422 /*
423 * See which interface the caller is talking about.
424 */
425
426 switch (cmd) {
427 /*
428 * These ioctl calls:
429 * - can be done by all.
430 * - atomic and do not require locking.
431 * - return a value
432 */
433 case SIOCGIFFLAGS:
434 case SIOCGIFMETRIC:
435 case SIOCGIFMTU:
436 case SIOCGIFHWADDR:
437 case SIOCGIFSLAVE:
438 case SIOCGIFMAP:
439 case SIOCGIFINDEX:
440 case SIOCGIFTXQLEN:
441 dev_load(net, ifr.ifr_name);
442 rcu_read_lock();
443 ret = dev_ifsioc_locked(net, &ifr, cmd);
444 rcu_read_unlock();
445 if (!ret) {
446 if (colon)
447 *colon = ':';
448 if (copy_to_user(arg, &ifr,
449 sizeof(struct ifreq)))
450 ret = -EFAULT;
451 }
452 return ret;
453
454 case SIOCETHTOOL:
455 dev_load(net, ifr.ifr_name);
456 rtnl_lock();
457 ret = dev_ethtool(net, &ifr);
458 rtnl_unlock();
459 if (!ret) {
460 if (colon)
461 *colon = ':';
462 if (copy_to_user(arg, &ifr,
463 sizeof(struct ifreq)))
464 ret = -EFAULT;
465 }
466 return ret;
467
468 /*
469 * These ioctl calls:
470 * - require superuser power.
471 * - require strict serialization.
472 * - return a value
473 */
474 case SIOCGMIIPHY:
475 case SIOCGMIIREG:
476 case SIOCSIFNAME:
477 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
478 return -EPERM;
479 dev_load(net, ifr.ifr_name);
480 rtnl_lock();
481 ret = dev_ifsioc(net, &ifr, cmd);
482 rtnl_unlock();
483 if (!ret) {
484 if (colon)
485 *colon = ':';
486 if (copy_to_user(arg, &ifr,
487 sizeof(struct ifreq)))
488 ret = -EFAULT;
489 }
490 return ret;
491
492 /*
493 * These ioctl calls:
494 * - require superuser power.
495 * - require strict serialization.
496 * - do not return a value
497 */
498 case SIOCSIFMAP:
499 case SIOCSIFTXQLEN:
500 if (!capable(CAP_NET_ADMIN))
501 return -EPERM;
502 /* fall through */
503 /*
504 * These ioctl calls:
505 * - require local superuser power.
506 * - require strict serialization.
507 * - do not return a value
508 */
509 case SIOCSIFFLAGS:
510 case SIOCSIFMETRIC:
511 case SIOCSIFMTU:
512 case SIOCSIFHWADDR:
513 case SIOCSIFSLAVE:
514 case SIOCADDMULTI:
515 case SIOCDELMULTI:
516 case SIOCSIFHWBROADCAST:
517 case SIOCSMIIREG:
518 case SIOCBONDENSLAVE:
519 case SIOCBONDRELEASE:
520 case SIOCBONDSETHWADDR:
521 case SIOCBONDCHANGEACTIVE:
522 case SIOCBRADDIF:
523 case SIOCBRDELIF:
524 case SIOCSHWTSTAMP:
525 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
526 return -EPERM;
527 /* fall through */
528 case SIOCBONDSLAVEINFOQUERY:
529 case SIOCBONDINFOQUERY:
530 dev_load(net, ifr.ifr_name);
531 rtnl_lock();
532 ret = dev_ifsioc(net, &ifr, cmd);
533 rtnl_unlock();
534 return ret;
535
536 case SIOCGIFMEM:
537 /* Get the per device memory space. We can add this but
538 * currently do not support it */
539 case SIOCSIFMEM:
540 /* Set the per device memory buffer space.
541 * Not applicable in our case */
542 case SIOCSIFLINK:
543 return -ENOTTY;
544
545 /*
546 * Unknown or private ioctl.
547 */
548 default:
549 if (cmd == SIOCWANDEV ||
550 cmd == SIOCGHWTSTAMP ||
551 (cmd >= SIOCDEVPRIVATE &&
552 cmd <= SIOCDEVPRIVATE + 15)) {
553 dev_load(net, ifr.ifr_name);
554 rtnl_lock();
555 ret = dev_ifsioc(net, &ifr, cmd);
556 rtnl_unlock();
557 if (!ret && copy_to_user(arg, &ifr,
558 sizeof(struct ifreq)))
559 ret = -EFAULT;
560 return ret;
561 }
562 /* Take care of Wireless Extensions */
563 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
564 return wext_handle_ioctl(net, &ifr, cmd, arg);
565 return -ENOTTY;
566 }
567}