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/dsa.h>
9 #include <net/wext.h>
10
11 /*
12 * Map an interface index to its name (SIOCGIFNAME)
13 */
14
15 /*
16 * We need this ioctl for efficient implementation of the
17 * if_indextoname() function required by the IPv6 API. Without
18 * it, we would have to search all the interfaces to find a
19 * match. --pb
20 */
21
dev_ifname(struct net * net,struct ifreq * ifr)22 static int dev_ifname(struct net *net, struct ifreq *ifr)
23 {
24 ifr->ifr_name[IFNAMSIZ-1] = 0;
25 return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
26 }
27
28 static gifconf_func_t *gifconf_list[NPROTO];
29
30 /**
31 * register_gifconf - register a SIOCGIF handler
32 * @family: Address family
33 * @gifconf: Function handler
34 *
35 * Register protocol dependent address dumping routines. The handler
36 * that is passed must not be freed or reused until it has been replaced
37 * by another handler.
38 */
register_gifconf(unsigned int family,gifconf_func_t * gifconf)39 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
40 {
41 if (family >= NPROTO)
42 return -EINVAL;
43 gifconf_list[family] = gifconf;
44 return 0;
45 }
46 EXPORT_SYMBOL(register_gifconf);
47
48 /*
49 * Perform a SIOCGIFCONF call. This structure will change
50 * size eventually, and there is nothing I can do about it.
51 * Thus we will need a 'compatibility mode'.
52 */
53
dev_ifconf(struct net * net,struct ifconf * ifc,int size)54 int dev_ifconf(struct net *net, struct ifconf *ifc, int size)
55 {
56 struct net_device *dev;
57 char __user *pos;
58 int len;
59 int total;
60 int i;
61
62 /*
63 * Fetch the caller's info block.
64 */
65
66 pos = ifc->ifc_buf;
67 len = ifc->ifc_len;
68
69 /*
70 * Loop over the interfaces, and write an info block for each.
71 */
72
73 total = 0;
74 for_each_netdev(net, dev) {
75 for (i = 0; i < NPROTO; i++) {
76 if (gifconf_list[i]) {
77 int done;
78 if (!pos)
79 done = gifconf_list[i](dev, NULL, 0, size);
80 else
81 done = gifconf_list[i](dev, pos + total,
82 len - total, size);
83 if (done < 0)
84 return -EFAULT;
85 total += done;
86 }
87 }
88 }
89
90 /*
91 * All done. Write the updated control block back to the caller.
92 */
93 ifc->ifc_len = total;
94
95 /*
96 * Both BSD and Solaris return 0 here, so we do too.
97 */
98 return 0;
99 }
100
101 /*
102 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
103 */
dev_ifsioc_locked(struct net * net,struct ifreq * ifr,unsigned int cmd)104 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
105 {
106 int err;
107 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
108
109 if (!dev)
110 return -ENODEV;
111
112 switch (cmd) {
113 case SIOCGIFFLAGS: /* Get interface flags */
114 ifr->ifr_flags = (short) dev_get_flags(dev);
115 return 0;
116
117 case SIOCGIFMETRIC: /* Get the metric on the interface
118 (currently unused) */
119 ifr->ifr_metric = 0;
120 return 0;
121
122 case SIOCGIFMTU: /* Get the MTU of a device */
123 ifr->ifr_mtu = dev->mtu;
124 return 0;
125
126 case SIOCGIFHWADDR:
127 if (!dev->addr_len)
128 memset(ifr->ifr_hwaddr.sa_data, 0,
129 sizeof(ifr->ifr_hwaddr.sa_data));
130 else
131 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
132 min(sizeof(ifr->ifr_hwaddr.sa_data),
133 (size_t)dev->addr_len));
134 ifr->ifr_hwaddr.sa_family = dev->type;
135 return 0;
136
137 case SIOCGIFSLAVE:
138 err = -EINVAL;
139 break;
140
141 case SIOCGIFMAP:
142 ifr->ifr_map.mem_start = dev->mem_start;
143 ifr->ifr_map.mem_end = dev->mem_end;
144 ifr->ifr_map.base_addr = dev->base_addr;
145 ifr->ifr_map.irq = dev->irq;
146 ifr->ifr_map.dma = dev->dma;
147 ifr->ifr_map.port = dev->if_port;
148 return 0;
149
150 case SIOCGIFINDEX:
151 ifr->ifr_ifindex = dev->ifindex;
152 return 0;
153
154 case SIOCGIFTXQLEN:
155 ifr->ifr_qlen = dev->tx_queue_len;
156 return 0;
157
158 default:
159 /* dev_ioctl() should ensure this case
160 * is never reached
161 */
162 WARN_ON(1);
163 err = -ENOTTY;
164 break;
165
166 }
167 return err;
168 }
169
net_hwtstamp_validate(struct ifreq * ifr)170 static int net_hwtstamp_validate(struct ifreq *ifr)
171 {
172 struct hwtstamp_config cfg;
173 enum hwtstamp_tx_types tx_type;
174 enum hwtstamp_rx_filters rx_filter;
175 int tx_type_valid = 0;
176 int rx_filter_valid = 0;
177
178 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
179 return -EFAULT;
180
181 if (cfg.flags) /* reserved for future extensions */
182 return -EINVAL;
183
184 tx_type = cfg.tx_type;
185 rx_filter = cfg.rx_filter;
186
187 switch (tx_type) {
188 case HWTSTAMP_TX_OFF:
189 case HWTSTAMP_TX_ON:
190 case HWTSTAMP_TX_ONESTEP_SYNC:
191 case HWTSTAMP_TX_ONESTEP_P2P:
192 tx_type_valid = 1;
193 break;
194 case __HWTSTAMP_TX_CNT:
195 /* not a real value */
196 break;
197 }
198
199 switch (rx_filter) {
200 case HWTSTAMP_FILTER_NONE:
201 case HWTSTAMP_FILTER_ALL:
202 case HWTSTAMP_FILTER_SOME:
203 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
204 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
205 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
206 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
207 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
208 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
209 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
210 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
211 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
212 case HWTSTAMP_FILTER_PTP_V2_EVENT:
213 case HWTSTAMP_FILTER_PTP_V2_SYNC:
214 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
215 case HWTSTAMP_FILTER_NTP_ALL:
216 rx_filter_valid = 1;
217 break;
218 case __HWTSTAMP_FILTER_CNT:
219 /* not a real value */
220 break;
221 }
222
223 if (!tx_type_valid || !rx_filter_valid)
224 return -ERANGE;
225
226 return 0;
227 }
228
dev_do_ioctl(struct net_device * dev,struct ifreq * ifr,unsigned int cmd)229 static int dev_do_ioctl(struct net_device *dev,
230 struct ifreq *ifr, unsigned int cmd)
231 {
232 const struct net_device_ops *ops = dev->netdev_ops;
233 int err = -EOPNOTSUPP;
234
235 err = dsa_ndo_do_ioctl(dev, ifr, cmd);
236 if (err == 0 || err != -EOPNOTSUPP)
237 return err;
238
239 if (ops->ndo_do_ioctl) {
240 if (netif_device_present(dev))
241 err = ops->ndo_do_ioctl(dev, ifr, cmd);
242 else
243 err = -ENODEV;
244 }
245
246 return err;
247 }
248
249 /*
250 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
251 */
dev_ifsioc(struct net * net,struct ifreq * ifr,unsigned int cmd)252 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
253 {
254 int err;
255 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
256 const struct net_device_ops *ops;
257
258 if (!dev)
259 return -ENODEV;
260
261 ops = dev->netdev_ops;
262
263 switch (cmd) {
264 case SIOCSIFFLAGS: /* Set interface flags */
265 return dev_change_flags(dev, ifr->ifr_flags, NULL);
266
267 case SIOCSIFMETRIC: /* Set the metric on the interface
268 (currently unused) */
269 return -EOPNOTSUPP;
270
271 case SIOCSIFMTU: /* Set the MTU of a device */
272 return dev_set_mtu(dev, ifr->ifr_mtu);
273
274 case SIOCSIFHWADDR:
275 if (dev->addr_len > sizeof(struct sockaddr))
276 return -EINVAL;
277 return dev_set_mac_address(dev, &ifr->ifr_hwaddr, NULL);
278
279 case SIOCSIFHWBROADCAST:
280 if (ifr->ifr_hwaddr.sa_family != dev->type)
281 return -EINVAL;
282 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
283 min(sizeof(ifr->ifr_hwaddr.sa_data),
284 (size_t)dev->addr_len));
285 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
286 return 0;
287
288 case SIOCSIFMAP:
289 if (ops->ndo_set_config) {
290 if (!netif_device_present(dev))
291 return -ENODEV;
292 return ops->ndo_set_config(dev, &ifr->ifr_map);
293 }
294 return -EOPNOTSUPP;
295
296 case SIOCADDMULTI:
297 if (!ops->ndo_set_rx_mode ||
298 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
299 return -EINVAL;
300 if (!netif_device_present(dev))
301 return -ENODEV;
302 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
303
304 case SIOCDELMULTI:
305 if (!ops->ndo_set_rx_mode ||
306 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
307 return -EINVAL;
308 if (!netif_device_present(dev))
309 return -ENODEV;
310 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
311
312 case SIOCSIFTXQLEN:
313 if (ifr->ifr_qlen < 0)
314 return -EINVAL;
315 return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
316
317 case SIOCSIFNAME:
318 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
319 return dev_change_name(dev, ifr->ifr_newname);
320
321 case SIOCSHWTSTAMP:
322 err = net_hwtstamp_validate(ifr);
323 if (err)
324 return err;
325 fallthrough;
326
327 /*
328 * Unknown or private ioctl
329 */
330 default:
331 if ((cmd >= SIOCDEVPRIVATE &&
332 cmd <= SIOCDEVPRIVATE + 15) ||
333 cmd == SIOCBONDENSLAVE ||
334 cmd == SIOCBONDRELEASE ||
335 cmd == SIOCBONDSETHWADDR ||
336 cmd == SIOCBONDSLAVEINFOQUERY ||
337 cmd == SIOCBONDINFOQUERY ||
338 cmd == SIOCBONDCHANGEACTIVE ||
339 cmd == SIOCGMIIPHY ||
340 cmd == SIOCGMIIREG ||
341 cmd == SIOCSMIIREG ||
342 cmd == SIOCBRADDIF ||
343 cmd == SIOCBRDELIF ||
344 cmd == SIOCSHWTSTAMP ||
345 cmd == SIOCGHWTSTAMP ||
346 cmd == SIOCWANDEV) {
347 err = dev_do_ioctl(dev, ifr, cmd);
348 } else
349 err = -EINVAL;
350
351 }
352 return err;
353 }
354
355 /**
356 * dev_load - load a network module
357 * @net: the applicable net namespace
358 * @name: name of interface
359 *
360 * If a network interface is not present and the process has suitable
361 * privileges this function loads the module. If module loading is not
362 * available in this kernel then it becomes a nop.
363 */
364
dev_load(struct net * net,const char * name)365 void dev_load(struct net *net, const char *name)
366 {
367 struct net_device *dev;
368 int no_module;
369
370 rcu_read_lock();
371 dev = dev_get_by_name_rcu(net, name);
372 rcu_read_unlock();
373
374 no_module = !dev;
375 if (no_module && capable(CAP_NET_ADMIN))
376 no_module = request_module("netdev-%s", name);
377 if (no_module && capable(CAP_SYS_MODULE))
378 request_module("%s", name);
379 }
380 EXPORT_SYMBOL(dev_load);
381
382 /*
383 * This function handles all "interface"-type I/O control requests. The actual
384 * 'doing' part of this is dev_ifsioc above.
385 */
386
387 /**
388 * dev_ioctl - network device ioctl
389 * @net: the applicable net namespace
390 * @cmd: command to issue
391 * @ifr: pointer to a struct ifreq in user space
392 * @need_copyout: whether or not copy_to_user() should be called
393 *
394 * Issue ioctl functions to devices. This is normally called by the
395 * user space syscall interfaces but can sometimes be useful for
396 * other purposes. The return value is the return from the syscall if
397 * positive or a negative errno code on error.
398 */
399
dev_ioctl(struct net * net,unsigned int cmd,struct ifreq * ifr,bool * need_copyout)400 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_copyout)
401 {
402 int ret;
403 char *colon;
404
405 if (need_copyout)
406 *need_copyout = true;
407 if (cmd == SIOCGIFNAME)
408 return dev_ifname(net, ifr);
409
410 ifr->ifr_name[IFNAMSIZ-1] = 0;
411
412 colon = strchr(ifr->ifr_name, ':');
413 if (colon)
414 *colon = 0;
415
416 /*
417 * See which interface the caller is talking about.
418 */
419
420 switch (cmd) {
421 /*
422 * These ioctl calls:
423 * - can be done by all.
424 * - atomic and do not require locking.
425 * - return a value
426 */
427 case SIOCGIFFLAGS:
428 case SIOCGIFMETRIC:
429 case SIOCGIFMTU:
430 case SIOCGIFHWADDR:
431 case SIOCGIFSLAVE:
432 case SIOCGIFMAP:
433 case SIOCGIFINDEX:
434 case SIOCGIFTXQLEN:
435 dev_load(net, ifr->ifr_name);
436 rcu_read_lock();
437 ret = dev_ifsioc_locked(net, ifr, cmd);
438 rcu_read_unlock();
439 if (colon)
440 *colon = ':';
441 return ret;
442
443 case SIOCETHTOOL:
444 dev_load(net, ifr->ifr_name);
445 rtnl_lock();
446 ret = dev_ethtool(net, ifr);
447 rtnl_unlock();
448 if (colon)
449 *colon = ':';
450 return ret;
451
452 /*
453 * These ioctl calls:
454 * - require superuser power.
455 * - require strict serialization.
456 * - return a value
457 */
458 case SIOCGMIIPHY:
459 case SIOCGMIIREG:
460 case SIOCSIFNAME:
461 dev_load(net, ifr->ifr_name);
462 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
463 return -EPERM;
464 rtnl_lock();
465 ret = dev_ifsioc(net, ifr, cmd);
466 rtnl_unlock();
467 if (colon)
468 *colon = ':';
469 return ret;
470
471 /*
472 * These ioctl calls:
473 * - require superuser power.
474 * - require strict serialization.
475 * - do not return a value
476 */
477 case SIOCSIFMAP:
478 case SIOCSIFTXQLEN:
479 if (!capable(CAP_NET_ADMIN))
480 return -EPERM;
481 fallthrough;
482 /*
483 * These ioctl calls:
484 * - require local superuser power.
485 * - require strict serialization.
486 * - do not return a value
487 */
488 case SIOCSIFFLAGS:
489 case SIOCSIFMETRIC:
490 case SIOCSIFMTU:
491 case SIOCSIFHWADDR:
492 case SIOCSIFSLAVE:
493 case SIOCADDMULTI:
494 case SIOCDELMULTI:
495 case SIOCSIFHWBROADCAST:
496 case SIOCSMIIREG:
497 case SIOCBONDENSLAVE:
498 case SIOCBONDRELEASE:
499 case SIOCBONDSETHWADDR:
500 case SIOCBONDCHANGEACTIVE:
501 case SIOCBRADDIF:
502 case SIOCBRDELIF:
503 case SIOCSHWTSTAMP:
504 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
505 return -EPERM;
506 fallthrough;
507 case SIOCBONDSLAVEINFOQUERY:
508 case SIOCBONDINFOQUERY:
509 dev_load(net, ifr->ifr_name);
510 rtnl_lock();
511 ret = dev_ifsioc(net, ifr, cmd);
512 rtnl_unlock();
513 if (need_copyout)
514 *need_copyout = false;
515 return ret;
516
517 case SIOCGIFMEM:
518 /* Get the per device memory space. We can add this but
519 * currently do not support it */
520 case SIOCSIFMEM:
521 /* Set the per device memory buffer space.
522 * Not applicable in our case */
523 case SIOCSIFLINK:
524 return -ENOTTY;
525
526 /*
527 * Unknown or private ioctl.
528 */
529 default:
530 if (cmd == SIOCWANDEV ||
531 cmd == SIOCGHWTSTAMP ||
532 (cmd >= SIOCDEVPRIVATE &&
533 cmd <= SIOCDEVPRIVATE + 15)) {
534 dev_load(net, ifr->ifr_name);
535 rtnl_lock();
536 ret = dev_ifsioc(net, ifr, cmd);
537 rtnl_unlock();
538 return ret;
539 }
540 return -ENOTTY;
541 }
542 }
543
