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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/kmod.h>
3#include <linux/netdevice.h>
4#include <linux/inetdevice.h>
5#include <linux/etherdevice.h>
6#include <linux/rtnetlink.h>
7#include <linux/net_tstamp.h>
8#include <linux/wireless.h>
9#include <linux/if_bridge.h>
10#include <net/dsa.h>
11#include <net/wext.h>
12
13#include "dev.h"
14
15/*
16 * Map an interface index to its name (SIOCGIFNAME)
17 */
18
19/*
20 * We need this ioctl for efficient implementation of the
21 * if_indextoname() function required by the IPv6 API. Without
22 * it, we would have to search all the interfaces to find a
23 * match. --pb
24 */
25
26static int dev_ifname(struct net *net, struct ifreq *ifr)
27{
28 ifr->ifr_name[IFNAMSIZ-1] = 0;
29 return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
30}
31
32/*
33 * Perform a SIOCGIFCONF call. This structure will change
34 * size eventually, and there is nothing I can do about it.
35 * Thus we will need a 'compatibility mode'.
36 */
37int dev_ifconf(struct net *net, struct ifconf __user *uifc)
38{
39 struct net_device *dev;
40 void __user *pos;
41 size_t size;
42 int len, total = 0, done;
43
44 /* both the ifconf and the ifreq structures are slightly different */
45 if (in_compat_syscall()) {
46 struct compat_ifconf ifc32;
47
48 if (copy_from_user(&ifc32, uifc, sizeof(struct compat_ifconf)))
49 return -EFAULT;
50
51 pos = compat_ptr(ifc32.ifcbuf);
52 len = ifc32.ifc_len;
53 size = sizeof(struct compat_ifreq);
54 } else {
55 struct ifconf ifc;
56
57 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
58 return -EFAULT;
59
60 pos = ifc.ifc_buf;
61 len = ifc.ifc_len;
62 size = sizeof(struct ifreq);
63 }
64
65 /* Loop over the interfaces, and write an info block for each. */
66 rtnl_lock();
67 for_each_netdev(net, dev) {
68 if (!pos)
69 done = inet_gifconf(dev, NULL, 0, size);
70 else
71 done = inet_gifconf(dev, pos + total,
72 len - total, size);
73 if (done < 0) {
74 rtnl_unlock();
75 return -EFAULT;
76 }
77 total += done;
78 }
79 rtnl_unlock();
80
81 return put_user(total, &uifc->ifc_len);
82}
83
84static int dev_getifmap(struct net_device *dev, struct ifreq *ifr)
85{
86 struct ifmap *ifmap = &ifr->ifr_map;
87
88 if (in_compat_syscall()) {
89 struct compat_ifmap *cifmap = (struct compat_ifmap *)ifmap;
90
91 cifmap->mem_start = dev->mem_start;
92 cifmap->mem_end = dev->mem_end;
93 cifmap->base_addr = dev->base_addr;
94 cifmap->irq = dev->irq;
95 cifmap->dma = dev->dma;
96 cifmap->port = dev->if_port;
97
98 return 0;
99 }
100
101 ifmap->mem_start = dev->mem_start;
102 ifmap->mem_end = dev->mem_end;
103 ifmap->base_addr = dev->base_addr;
104 ifmap->irq = dev->irq;
105 ifmap->dma = dev->dma;
106 ifmap->port = dev->if_port;
107
108 return 0;
109}
110
111static int dev_setifmap(struct net_device *dev, struct ifreq *ifr)
112{
113 struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map;
114
115 if (!dev->netdev_ops->ndo_set_config)
116 return -EOPNOTSUPP;
117
118 if (in_compat_syscall()) {
119 struct ifmap ifmap = {
120 .mem_start = cifmap->mem_start,
121 .mem_end = cifmap->mem_end,
122 .base_addr = cifmap->base_addr,
123 .irq = cifmap->irq,
124 .dma = cifmap->dma,
125 .port = cifmap->port,
126 };
127
128 return dev->netdev_ops->ndo_set_config(dev, &ifmap);
129 }
130
131 return dev->netdev_ops->ndo_set_config(dev, &ifr->ifr_map);
132}
133
134/*
135 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
136 */
137static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
138{
139 int err;
140 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
141
142 if (!dev)
143 return -ENODEV;
144
145 switch (cmd) {
146 case SIOCGIFFLAGS: /* Get interface flags */
147 ifr->ifr_flags = (short) dev_get_flags(dev);
148 return 0;
149
150 case SIOCGIFMETRIC: /* Get the metric on the interface
151 (currently unused) */
152 ifr->ifr_metric = 0;
153 return 0;
154
155 case SIOCGIFMTU: /* Get the MTU of a device */
156 ifr->ifr_mtu = dev->mtu;
157 return 0;
158
159 case SIOCGIFSLAVE:
160 err = -EINVAL;
161 break;
162
163 case SIOCGIFMAP:
164 return dev_getifmap(dev, ifr);
165
166 case SIOCGIFINDEX:
167 ifr->ifr_ifindex = dev->ifindex;
168 return 0;
169
170 case SIOCGIFTXQLEN:
171 ifr->ifr_qlen = dev->tx_queue_len;
172 return 0;
173
174 default:
175 /* dev_ioctl() should ensure this case
176 * is never reached
177 */
178 WARN_ON(1);
179 err = -ENOTTY;
180 break;
181
182 }
183 return err;
184}
185
186static int net_hwtstamp_validate(struct ifreq *ifr)
187{
188 struct hwtstamp_config cfg;
189 enum hwtstamp_tx_types tx_type;
190 enum hwtstamp_rx_filters rx_filter;
191 int tx_type_valid = 0;
192 int rx_filter_valid = 0;
193
194 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
195 return -EFAULT;
196
197 if (cfg.flags & ~HWTSTAMP_FLAG_MASK)
198 return -EINVAL;
199
200 tx_type = cfg.tx_type;
201 rx_filter = cfg.rx_filter;
202
203 switch (tx_type) {
204 case HWTSTAMP_TX_OFF:
205 case HWTSTAMP_TX_ON:
206 case HWTSTAMP_TX_ONESTEP_SYNC:
207 case HWTSTAMP_TX_ONESTEP_P2P:
208 tx_type_valid = 1;
209 break;
210 case __HWTSTAMP_TX_CNT:
211 /* not a real value */
212 break;
213 }
214
215 switch (rx_filter) {
216 case HWTSTAMP_FILTER_NONE:
217 case HWTSTAMP_FILTER_ALL:
218 case HWTSTAMP_FILTER_SOME:
219 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
220 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
221 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
222 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
223 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
224 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
225 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
226 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
227 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
228 case HWTSTAMP_FILTER_PTP_V2_EVENT:
229 case HWTSTAMP_FILTER_PTP_V2_SYNC:
230 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
231 case HWTSTAMP_FILTER_NTP_ALL:
232 rx_filter_valid = 1;
233 break;
234 case __HWTSTAMP_FILTER_CNT:
235 /* not a real value */
236 break;
237 }
238
239 if (!tx_type_valid || !rx_filter_valid)
240 return -ERANGE;
241
242 return 0;
243}
244
245static int dev_eth_ioctl(struct net_device *dev,
246 struct ifreq *ifr, unsigned int cmd)
247{
248 const struct net_device_ops *ops = dev->netdev_ops;
249 int err;
250
251 err = dsa_ndo_eth_ioctl(dev, ifr, cmd);
252 if (err == 0 || err != -EOPNOTSUPP)
253 return err;
254
255 if (ops->ndo_eth_ioctl) {
256 if (netif_device_present(dev))
257 err = ops->ndo_eth_ioctl(dev, ifr, cmd);
258 else
259 err = -ENODEV;
260 }
261
262 return err;
263}
264
265static int dev_siocbond(struct net_device *dev,
266 struct ifreq *ifr, unsigned int cmd)
267{
268 const struct net_device_ops *ops = dev->netdev_ops;
269
270 if (ops->ndo_siocbond) {
271 if (netif_device_present(dev))
272 return ops->ndo_siocbond(dev, ifr, cmd);
273 else
274 return -ENODEV;
275 }
276
277 return -EOPNOTSUPP;
278}
279
280static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
281 void __user *data, unsigned int cmd)
282{
283 const struct net_device_ops *ops = dev->netdev_ops;
284
285 if (ops->ndo_siocdevprivate) {
286 if (netif_device_present(dev))
287 return ops->ndo_siocdevprivate(dev, ifr, data, cmd);
288 else
289 return -ENODEV;
290 }
291
292 return -EOPNOTSUPP;
293}
294
295static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs)
296{
297 const struct net_device_ops *ops = dev->netdev_ops;
298
299 if (ops->ndo_siocwandev) {
300 if (netif_device_present(dev))
301 return ops->ndo_siocwandev(dev, ifs);
302 else
303 return -ENODEV;
304 }
305
306 return -EOPNOTSUPP;
307}
308
309/*
310 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
311 */
312static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
313 unsigned int cmd)
314{
315 int err;
316 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
317 const struct net_device_ops *ops;
318 netdevice_tracker dev_tracker;
319
320 if (!dev)
321 return -ENODEV;
322
323 ops = dev->netdev_ops;
324
325 switch (cmd) {
326 case SIOCSIFFLAGS: /* Set interface flags */
327 return dev_change_flags(dev, ifr->ifr_flags, NULL);
328
329 case SIOCSIFMETRIC: /* Set the metric on the interface
330 (currently unused) */
331 return -EOPNOTSUPP;
332
333 case SIOCSIFMTU: /* Set the MTU of a device */
334 return dev_set_mtu(dev, ifr->ifr_mtu);
335
336 case SIOCSIFHWADDR:
337 if (dev->addr_len > sizeof(struct sockaddr))
338 return -EINVAL;
339 return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL);
340
341 case SIOCSIFHWBROADCAST:
342 if (ifr->ifr_hwaddr.sa_family != dev->type)
343 return -EINVAL;
344 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
345 min(sizeof(ifr->ifr_hwaddr.sa_data_min),
346 (size_t)dev->addr_len));
347 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
348 return 0;
349
350 case SIOCSIFMAP:
351 return dev_setifmap(dev, ifr);
352
353 case SIOCADDMULTI:
354 if (!ops->ndo_set_rx_mode ||
355 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
356 return -EINVAL;
357 if (!netif_device_present(dev))
358 return -ENODEV;
359 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
360
361 case SIOCDELMULTI:
362 if (!ops->ndo_set_rx_mode ||
363 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
364 return -EINVAL;
365 if (!netif_device_present(dev))
366 return -ENODEV;
367 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
368
369 case SIOCSIFTXQLEN:
370 if (ifr->ifr_qlen < 0)
371 return -EINVAL;
372 return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
373
374 case SIOCSIFNAME:
375 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
376 return dev_change_name(dev, ifr->ifr_newname);
377
378 case SIOCWANDEV:
379 return dev_siocwandev(dev, &ifr->ifr_settings);
380
381 case SIOCBRADDIF:
382 case SIOCBRDELIF:
383 if (!netif_device_present(dev))
384 return -ENODEV;
385 if (!netif_is_bridge_master(dev))
386 return -EOPNOTSUPP;
387 netdev_hold(dev, &dev_tracker, GFP_KERNEL);
388 rtnl_unlock();
389 err = br_ioctl_call(net, netdev_priv(dev), cmd, ifr, NULL);
390 netdev_put(dev, &dev_tracker);
391 rtnl_lock();
392 return err;
393
394 case SIOCSHWTSTAMP:
395 err = net_hwtstamp_validate(ifr);
396 if (err)
397 return err;
398 fallthrough;
399
400 /*
401 * Unknown or private ioctl
402 */
403 default:
404 if (cmd >= SIOCDEVPRIVATE &&
405 cmd <= SIOCDEVPRIVATE + 15)
406 return dev_siocdevprivate(dev, ifr, data, cmd);
407
408 if (cmd == SIOCGMIIPHY ||
409 cmd == SIOCGMIIREG ||
410 cmd == SIOCSMIIREG ||
411 cmd == SIOCSHWTSTAMP ||
412 cmd == SIOCGHWTSTAMP) {
413 err = dev_eth_ioctl(dev, ifr, cmd);
414 } else if (cmd == SIOCBONDENSLAVE ||
415 cmd == SIOCBONDRELEASE ||
416 cmd == SIOCBONDSETHWADDR ||
417 cmd == SIOCBONDSLAVEINFOQUERY ||
418 cmd == SIOCBONDINFOQUERY ||
419 cmd == SIOCBONDCHANGEACTIVE) {
420 err = dev_siocbond(dev, ifr, cmd);
421 } else
422 err = -EINVAL;
423
424 }
425 return err;
426}
427
428/**
429 * dev_load - load a network module
430 * @net: the applicable net namespace
431 * @name: name of interface
432 *
433 * If a network interface is not present and the process has suitable
434 * privileges this function loads the module. If module loading is not
435 * available in this kernel then it becomes a nop.
436 */
437
438void dev_load(struct net *net, const char *name)
439{
440 struct net_device *dev;
441 int no_module;
442
443 rcu_read_lock();
444 dev = dev_get_by_name_rcu(net, name);
445 rcu_read_unlock();
446
447 no_module = !dev;
448 if (no_module && capable(CAP_NET_ADMIN))
449 no_module = request_module("netdev-%s", name);
450 if (no_module && capable(CAP_SYS_MODULE))
451 request_module("%s", name);
452}
453EXPORT_SYMBOL(dev_load);
454
455/*
456 * This function handles all "interface"-type I/O control requests. The actual
457 * 'doing' part of this is dev_ifsioc above.
458 */
459
460/**
461 * dev_ioctl - network device ioctl
462 * @net: the applicable net namespace
463 * @cmd: command to issue
464 * @ifr: pointer to a struct ifreq in user space
465 * @need_copyout: whether or not copy_to_user() should be called
466 *
467 * Issue ioctl functions to devices. This is normally called by the
468 * user space syscall interfaces but can sometimes be useful for
469 * other purposes. The return value is the return from the syscall if
470 * positive or a negative errno code on error.
471 */
472
473int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
474 void __user *data, bool *need_copyout)
475{
476 int ret;
477 char *colon;
478
479 if (need_copyout)
480 *need_copyout = true;
481 if (cmd == SIOCGIFNAME)
482 return dev_ifname(net, ifr);
483
484 ifr->ifr_name[IFNAMSIZ-1] = 0;
485
486 colon = strchr(ifr->ifr_name, ':');
487 if (colon)
488 *colon = 0;
489
490 /*
491 * See which interface the caller is talking about.
492 */
493
494 switch (cmd) {
495 case SIOCGIFHWADDR:
496 dev_load(net, ifr->ifr_name);
497 ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name);
498 if (colon)
499 *colon = ':';
500 return ret;
501 /*
502 * These ioctl calls:
503 * - can be done by all.
504 * - atomic and do not require locking.
505 * - return a value
506 */
507 case SIOCGIFFLAGS:
508 case SIOCGIFMETRIC:
509 case SIOCGIFMTU:
510 case SIOCGIFSLAVE:
511 case SIOCGIFMAP:
512 case SIOCGIFINDEX:
513 case SIOCGIFTXQLEN:
514 dev_load(net, ifr->ifr_name);
515 rcu_read_lock();
516 ret = dev_ifsioc_locked(net, ifr, cmd);
517 rcu_read_unlock();
518 if (colon)
519 *colon = ':';
520 return ret;
521
522 case SIOCETHTOOL:
523 dev_load(net, ifr->ifr_name);
524 ret = dev_ethtool(net, ifr, data);
525 if (colon)
526 *colon = ':';
527 return ret;
528
529 /*
530 * These ioctl calls:
531 * - require superuser power.
532 * - require strict serialization.
533 * - return a value
534 */
535 case SIOCGMIIPHY:
536 case SIOCGMIIREG:
537 case SIOCSIFNAME:
538 dev_load(net, ifr->ifr_name);
539 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
540 return -EPERM;
541 rtnl_lock();
542 ret = dev_ifsioc(net, ifr, data, cmd);
543 rtnl_unlock();
544 if (colon)
545 *colon = ':';
546 return ret;
547
548 /*
549 * These ioctl calls:
550 * - require superuser power.
551 * - require strict serialization.
552 * - do not return a value
553 */
554 case SIOCSIFMAP:
555 case SIOCSIFTXQLEN:
556 if (!capable(CAP_NET_ADMIN))
557 return -EPERM;
558 fallthrough;
559 /*
560 * These ioctl calls:
561 * - require local superuser power.
562 * - require strict serialization.
563 * - do not return a value
564 */
565 case SIOCSIFFLAGS:
566 case SIOCSIFMETRIC:
567 case SIOCSIFMTU:
568 case SIOCSIFHWADDR:
569 case SIOCSIFSLAVE:
570 case SIOCADDMULTI:
571 case SIOCDELMULTI:
572 case SIOCSIFHWBROADCAST:
573 case SIOCSMIIREG:
574 case SIOCBONDENSLAVE:
575 case SIOCBONDRELEASE:
576 case SIOCBONDSETHWADDR:
577 case SIOCBONDCHANGEACTIVE:
578 case SIOCBRADDIF:
579 case SIOCBRDELIF:
580 case SIOCSHWTSTAMP:
581 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
582 return -EPERM;
583 fallthrough;
584 case SIOCBONDSLAVEINFOQUERY:
585 case SIOCBONDINFOQUERY:
586 dev_load(net, ifr->ifr_name);
587 rtnl_lock();
588 ret = dev_ifsioc(net, ifr, data, cmd);
589 rtnl_unlock();
590 if (need_copyout)
591 *need_copyout = false;
592 return ret;
593
594 case SIOCGIFMEM:
595 /* Get the per device memory space. We can add this but
596 * currently do not support it */
597 case SIOCSIFMEM:
598 /* Set the per device memory buffer space.
599 * Not applicable in our case */
600 case SIOCSIFLINK:
601 return -ENOTTY;
602
603 /*
604 * Unknown or private ioctl.
605 */
606 default:
607 if (cmd == SIOCWANDEV ||
608 cmd == SIOCGHWTSTAMP ||
609 (cmd >= SIOCDEVPRIVATE &&
610 cmd <= SIOCDEVPRIVATE + 15)) {
611 dev_load(net, ifr->ifr_name);
612 rtnl_lock();
613 ret = dev_ifsioc(net, ifr, data, cmd);
614 rtnl_unlock();
615 return ret;
616 }
617 return -ENOTTY;
618 }
619}