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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;
31
Nicolas Schichan5dbe7c12013-06-26 17:23:42 +020032 error = netdev_get_name(net, ifr.ifr_name, ifr.ifr_ifindex);
33 if (error)
34 return error;
Cong Wang96b45cb2013-02-15 22:20:46 +000035
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, sizeof ifr->ifr_hwaddr.sa_data);
146 else
147 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
148 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
149 ifr->ifr_hwaddr.sa_family = dev->type;
150 return 0;
151
152 case SIOCGIFSLAVE:
153 err = -EINVAL;
154 break;
155
156 case SIOCGIFMAP:
157 ifr->ifr_map.mem_start = dev->mem_start;
158 ifr->ifr_map.mem_end = dev->mem_end;
159 ifr->ifr_map.base_addr = dev->base_addr;
160 ifr->ifr_map.irq = dev->irq;
161 ifr->ifr_map.dma = dev->dma;
162 ifr->ifr_map.port = dev->if_port;
163 return 0;
164
165 case SIOCGIFINDEX:
166 ifr->ifr_ifindex = dev->ifindex;
167 return 0;
168
169 case SIOCGIFTXQLEN:
170 ifr->ifr_qlen = dev->tx_queue_len;
171 return 0;
172
173 default:
174 /* dev_ioctl() should ensure this case
175 * is never reached
176 */
177 WARN_ON(1);
178 err = -ENOTTY;
179 break;
180
181 }
182 return err;
183}
184
185static int net_hwtstamp_validate(struct ifreq *ifr)
186{
187 struct hwtstamp_config cfg;
188 enum hwtstamp_tx_types tx_type;
189 enum hwtstamp_rx_filters rx_filter;
190 int tx_type_valid = 0;
191 int rx_filter_valid = 0;
192
193 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
194 return -EFAULT;
195
196 if (cfg.flags) /* reserved for future extensions */
197 return -EINVAL;
198
199 tx_type = cfg.tx_type;
200 rx_filter = cfg.rx_filter;
201
202 switch (tx_type) {
203 case HWTSTAMP_TX_OFF:
204 case HWTSTAMP_TX_ON:
205 case HWTSTAMP_TX_ONESTEP_SYNC:
206 tx_type_valid = 1;
207 break;
208 }
209
210 switch (rx_filter) {
211 case HWTSTAMP_FILTER_NONE:
212 case HWTSTAMP_FILTER_ALL:
213 case HWTSTAMP_FILTER_SOME:
214 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
215 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
216 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
217 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
218 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
219 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
220 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
221 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
222 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
223 case HWTSTAMP_FILTER_PTP_V2_EVENT:
224 case HWTSTAMP_FILTER_PTP_V2_SYNC:
225 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
226 rx_filter_valid = 1;
227 break;
228 }
229
230 if (!tx_type_valid || !rx_filter_valid)
231 return -ERANGE;
232
233 return 0;
234}
235
236/*
237 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
238 */
239static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
240{
241 int err;
242 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
243 const struct net_device_ops *ops;
244
245 if (!dev)
246 return -ENODEV;
247
248 ops = dev->netdev_ops;
249
250 switch (cmd) {
251 case SIOCSIFFLAGS: /* Set interface flags */
252 return dev_change_flags(dev, ifr->ifr_flags);
253
254 case SIOCSIFMETRIC: /* Set the metric on the interface
255 (currently unused) */
256 return -EOPNOTSUPP;
257
258 case SIOCSIFMTU: /* Set the MTU of a device */
259 return dev_set_mtu(dev, ifr->ifr_mtu);
260
261 case SIOCSIFHWADDR:
262 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
263
264 case SIOCSIFHWBROADCAST:
265 if (ifr->ifr_hwaddr.sa_family != dev->type)
266 return -EINVAL;
267 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
268 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
269 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
270 return 0;
271
272 case SIOCSIFMAP:
273 if (ops->ndo_set_config) {
274 if (!netif_device_present(dev))
275 return -ENODEV;
276 return ops->ndo_set_config(dev, &ifr->ifr_map);
277 }
278 return -EOPNOTSUPP;
279
280 case SIOCADDMULTI:
281 if (!ops->ndo_set_rx_mode ||
282 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
283 return -EINVAL;
284 if (!netif_device_present(dev))
285 return -ENODEV;
286 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
287
288 case SIOCDELMULTI:
289 if (!ops->ndo_set_rx_mode ||
290 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
291 return -EINVAL;
292 if (!netif_device_present(dev))
293 return -ENODEV;
294 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
295
296 case SIOCSIFTXQLEN:
297 if (ifr->ifr_qlen < 0)
298 return -EINVAL;
299 dev->tx_queue_len = ifr->ifr_qlen;
300 return 0;
301
302 case SIOCSIFNAME:
303 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
304 return dev_change_name(dev, ifr->ifr_newname);
305
306 case SIOCSHWTSTAMP:
307 err = net_hwtstamp_validate(ifr);
308 if (err)
309 return err;
310 /* fall through */
311
312 /*
313 * Unknown or private ioctl
314 */
315 default:
316 if ((cmd >= SIOCDEVPRIVATE &&
317 cmd <= SIOCDEVPRIVATE + 15) ||
318 cmd == SIOCBONDENSLAVE ||
319 cmd == SIOCBONDRELEASE ||
320 cmd == SIOCBONDSETHWADDR ||
321 cmd == SIOCBONDSLAVEINFOQUERY ||
322 cmd == SIOCBONDINFOQUERY ||
323 cmd == SIOCBONDCHANGEACTIVE ||
324 cmd == SIOCGMIIPHY ||
325 cmd == SIOCGMIIREG ||
326 cmd == SIOCSMIIREG ||
327 cmd == SIOCBRADDIF ||
328 cmd == SIOCBRDELIF ||
329 cmd == SIOCSHWTSTAMP ||
330 cmd == SIOCWANDEV) {
331 err = -EOPNOTSUPP;
332 if (ops->ndo_do_ioctl) {
333 if (netif_device_present(dev))
334 err = ops->ndo_do_ioctl(dev, ifr, cmd);
335 else
336 err = -ENODEV;
337 }
338 } else
339 err = -EINVAL;
340
341 }
342 return err;
343}
344
345/**
346 * dev_load - load a network module
347 * @net: the applicable net namespace
348 * @name: name of interface
349 *
350 * If a network interface is not present and the process has suitable
351 * privileges this function loads the module. If module loading is not
352 * available in this kernel then it becomes a nop.
353 */
354
355void dev_load(struct net *net, const char *name)
356{
357 struct net_device *dev;
358 int no_module;
359
360 rcu_read_lock();
361 dev = dev_get_by_name_rcu(net, name);
362 rcu_read_unlock();
363
364 no_module = !dev;
365 if (no_module && capable(CAP_NET_ADMIN))
366 no_module = request_module("netdev-%s", name);
367 if (no_module && capable(CAP_SYS_MODULE)) {
368 if (!request_module("%s", name))
369 pr_warn("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
370 name);
371 }
372}
373EXPORT_SYMBOL(dev_load);
374
375/*
376 * This function handles all "interface"-type I/O control requests. The actual
377 * 'doing' part of this is dev_ifsioc above.
378 */
379
380/**
381 * dev_ioctl - network device ioctl
382 * @net: the applicable net namespace
383 * @cmd: command to issue
384 * @arg: pointer to a struct ifreq in user space
385 *
386 * Issue ioctl functions to devices. This is normally called by the
387 * user space syscall interfaces but can sometimes be useful for
388 * other purposes. The return value is the return from the syscall if
389 * positive or a negative errno code on error.
390 */
391
392int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
393{
394 struct ifreq ifr;
395 int ret;
396 char *colon;
397
398 /* One special case: SIOCGIFCONF takes ifconf argument
399 and requires shared lock, because it sleeps writing
400 to user space.
401 */
402
403 if (cmd == SIOCGIFCONF) {
404 rtnl_lock();
405 ret = dev_ifconf(net, (char __user *) arg);
406 rtnl_unlock();
407 return ret;
408 }
409 if (cmd == SIOCGIFNAME)
410 return dev_ifname(net, (struct ifreq __user *)arg);
411
412 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
413 return -EFAULT;
414
415 ifr.ifr_name[IFNAMSIZ-1] = 0;
416
417 colon = strchr(ifr.ifr_name, ':');
418 if (colon)
419 *colon = 0;
420
421 /*
422 * See which interface the caller is talking about.
423 */
424
425 switch (cmd) {
426 /*
427 * These ioctl calls:
428 * - can be done by all.
429 * - atomic and do not require locking.
430 * - return a value
431 */
432 case SIOCGIFFLAGS:
433 case SIOCGIFMETRIC:
434 case SIOCGIFMTU:
435 case SIOCGIFHWADDR:
436 case SIOCGIFSLAVE:
437 case SIOCGIFMAP:
438 case SIOCGIFINDEX:
439 case SIOCGIFTXQLEN:
440 dev_load(net, ifr.ifr_name);
441 rcu_read_lock();
442 ret = dev_ifsioc_locked(net, &ifr, cmd);
443 rcu_read_unlock();
444 if (!ret) {
445 if (colon)
446 *colon = ':';
447 if (copy_to_user(arg, &ifr,
448 sizeof(struct ifreq)))
449 ret = -EFAULT;
450 }
451 return ret;
452
453 case SIOCETHTOOL:
454 dev_load(net, ifr.ifr_name);
455 rtnl_lock();
456 ret = dev_ethtool(net, &ifr);
457 rtnl_unlock();
458 if (!ret) {
459 if (colon)
460 *colon = ':';
461 if (copy_to_user(arg, &ifr,
462 sizeof(struct ifreq)))
463 ret = -EFAULT;
464 }
465 return ret;
466
467 /*
468 * These ioctl calls:
469 * - require superuser power.
470 * - require strict serialization.
471 * - return a value
472 */
473 case SIOCGMIIPHY:
474 case SIOCGMIIREG:
475 case SIOCSIFNAME:
476 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
477 return -EPERM;
478 dev_load(net, ifr.ifr_name);
479 rtnl_lock();
480 ret = dev_ifsioc(net, &ifr, cmd);
481 rtnl_unlock();
482 if (!ret) {
483 if (colon)
484 *colon = ':';
485 if (copy_to_user(arg, &ifr,
486 sizeof(struct ifreq)))
487 ret = -EFAULT;
488 }
489 return ret;
490
491 /*
492 * These ioctl calls:
493 * - require superuser power.
494 * - require strict serialization.
495 * - do not return a value
496 */
497 case SIOCSIFMAP:
498 case SIOCSIFTXQLEN:
499 if (!capable(CAP_NET_ADMIN))
500 return -EPERM;
501 /* fall through */
502 /*
503 * These ioctl calls:
504 * - require local superuser power.
505 * - require strict serialization.
506 * - do not return a value
507 */
508 case SIOCSIFFLAGS:
509 case SIOCSIFMETRIC:
510 case SIOCSIFMTU:
511 case SIOCSIFHWADDR:
512 case SIOCSIFSLAVE:
513 case SIOCADDMULTI:
514 case SIOCDELMULTI:
515 case SIOCSIFHWBROADCAST:
516 case SIOCSMIIREG:
517 case SIOCBONDENSLAVE:
518 case SIOCBONDRELEASE:
519 case SIOCBONDSETHWADDR:
520 case SIOCBONDCHANGEACTIVE:
521 case SIOCBRADDIF:
522 case SIOCBRDELIF:
523 case SIOCSHWTSTAMP:
524 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
525 return -EPERM;
526 /* fall through */
527 case SIOCBONDSLAVEINFOQUERY:
528 case SIOCBONDINFOQUERY:
529 dev_load(net, ifr.ifr_name);
530 rtnl_lock();
531 ret = dev_ifsioc(net, &ifr, cmd);
532 rtnl_unlock();
533 return ret;
534
535 case SIOCGIFMEM:
536 /* Get the per device memory space. We can add this but
537 * currently do not support it */
538 case SIOCSIFMEM:
539 /* Set the per device memory buffer space.
540 * Not applicable in our case */
541 case SIOCSIFLINK:
542 return -ENOTTY;
543
544 /*
545 * Unknown or private ioctl.
546 */
547 default:
548 if (cmd == SIOCWANDEV ||
549 (cmd >= SIOCDEVPRIVATE &&
550 cmd <= SIOCDEVPRIVATE + 15)) {
551 dev_load(net, ifr.ifr_name);
552 rtnl_lock();
553 ret = dev_ifsioc(net, &ifr, cmd);
554 rtnl_unlock();
555 if (!ret && copy_to_user(arg, &ifr,
556 sizeof(struct ifreq)))
557 ret = -EFAULT;
558 return ret;
559 }
560 /* Take care of Wireless Extensions */
561 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
562 return wext_handle_ioctl(net, &ifr, cmd, arg);
563 return -ENOTTY;
564 }
565}