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/phylib_stubs.h>
9 #include <linux/wireless.h>
10 #include <linux/if_bridge.h>
11 #include <net/dsa_stubs.h>
12 #include <net/wext.h>
13
14 #include "dev.h"
15
16 /*
17 * Map an interface index to its name (SIOCGIFNAME)
18 */
19
20 /*
21 * We need this ioctl for efficient implementation of the
22 * if_indextoname() function required by the IPv6 API. Without
23 * it, we would have to search all the interfaces to find a
24 * match. --pb
25 */
26
dev_ifname(struct net * net,struct ifreq * ifr)27 static int dev_ifname(struct net *net, struct ifreq *ifr)
28 {
29 ifr->ifr_name[IFNAMSIZ-1] = 0;
30 return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
31 }
32
33 /*
34 * Perform a SIOCGIFCONF call. This structure will change
35 * size eventually, and there is nothing I can do about it.
36 * Thus we will need a 'compatibility mode'.
37 */
dev_ifconf(struct net * net,struct ifconf __user * uifc)38 int dev_ifconf(struct net *net, struct ifconf __user *uifc)
39 {
40 struct net_device *dev;
41 void __user *pos;
42 size_t size;
43 int len, total = 0, done;
44
45 /* both the ifconf and the ifreq structures are slightly different */
46 if (in_compat_syscall()) {
47 struct compat_ifconf ifc32;
48
49 if (copy_from_user(&ifc32, uifc, sizeof(struct compat_ifconf)))
50 return -EFAULT;
51
52 pos = compat_ptr(ifc32.ifcbuf);
53 len = ifc32.ifc_len;
54 size = sizeof(struct compat_ifreq);
55 } else {
56 struct ifconf ifc;
57
58 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
59 return -EFAULT;
60
61 pos = ifc.ifc_buf;
62 len = ifc.ifc_len;
63 size = sizeof(struct ifreq);
64 }
65
66 /* Loop over the interfaces, and write an info block for each. */
67 rtnl_lock();
68 for_each_netdev(net, dev) {
69 if (!pos)
70 done = inet_gifconf(dev, NULL, 0, size);
71 else
72 done = inet_gifconf(dev, pos + total,
73 len - total, size);
74 if (done < 0) {
75 rtnl_unlock();
76 return -EFAULT;
77 }
78 total += done;
79 }
80 rtnl_unlock();
81
82 return put_user(total, &uifc->ifc_len);
83 }
84
dev_getifmap(struct net_device * dev,struct ifreq * ifr)85 static int dev_getifmap(struct net_device *dev, struct ifreq *ifr)
86 {
87 struct ifmap *ifmap = &ifr->ifr_map;
88
89 if (in_compat_syscall()) {
90 struct compat_ifmap *cifmap = (struct compat_ifmap *)ifmap;
91
92 cifmap->mem_start = dev->mem_start;
93 cifmap->mem_end = dev->mem_end;
94 cifmap->base_addr = dev->base_addr;
95 cifmap->irq = dev->irq;
96 cifmap->dma = dev->dma;
97 cifmap->port = dev->if_port;
98
99 return 0;
100 }
101
102 ifmap->mem_start = dev->mem_start;
103 ifmap->mem_end = dev->mem_end;
104 ifmap->base_addr = dev->base_addr;
105 ifmap->irq = dev->irq;
106 ifmap->dma = dev->dma;
107 ifmap->port = dev->if_port;
108
109 return 0;
110 }
111
dev_setifmap(struct net_device * dev,struct ifreq * ifr)112 static int dev_setifmap(struct net_device *dev, struct ifreq *ifr)
113 {
114 struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map;
115
116 if (!dev->netdev_ops->ndo_set_config)
117 return -EOPNOTSUPP;
118
119 if (in_compat_syscall()) {
120 struct ifmap ifmap = {
121 .mem_start = cifmap->mem_start,
122 .mem_end = cifmap->mem_end,
123 .base_addr = cifmap->base_addr,
124 .irq = cifmap->irq,
125 .dma = cifmap->dma,
126 .port = cifmap->port,
127 };
128
129 return dev->netdev_ops->ndo_set_config(dev, &ifmap);
130 }
131
132 return dev->netdev_ops->ndo_set_config(dev, &ifr->ifr_map);
133 }
134
135 /*
136 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
137 */
dev_ifsioc_locked(struct net * net,struct ifreq * ifr,unsigned int cmd)138 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
139 {
140 int err;
141 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
142
143 if (!dev)
144 return -ENODEV;
145
146 switch (cmd) {
147 case SIOCGIFFLAGS: /* Get interface flags */
148 ifr->ifr_flags = (short) dev_get_flags(dev);
149 return 0;
150
151 case SIOCGIFMETRIC: /* Get the metric on the interface
152 (currently unused) */
153 ifr->ifr_metric = 0;
154 return 0;
155
156 case SIOCGIFMTU: /* Get the MTU of a device */
157 ifr->ifr_mtu = dev->mtu;
158 return 0;
159
160 case SIOCGIFSLAVE:
161 err = -EINVAL;
162 break;
163
164 case SIOCGIFMAP:
165 return dev_getifmap(dev, ifr);
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
net_hwtstamp_validate(const struct kernel_hwtstamp_config * cfg)187 static int net_hwtstamp_validate(const struct kernel_hwtstamp_config *cfg)
188 {
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 (cfg->flags & ~HWTSTAMP_FLAG_MASK)
195 return -EINVAL;
196
197 tx_type = cfg->tx_type;
198 rx_filter = cfg->rx_filter;
199
200 switch (tx_type) {
201 case HWTSTAMP_TX_OFF:
202 case HWTSTAMP_TX_ON:
203 case HWTSTAMP_TX_ONESTEP_SYNC:
204 case HWTSTAMP_TX_ONESTEP_P2P:
205 tx_type_valid = 1;
206 break;
207 case __HWTSTAMP_TX_CNT:
208 /* not a real value */
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 case HWTSTAMP_FILTER_NTP_ALL:
229 rx_filter_valid = 1;
230 break;
231 case __HWTSTAMP_FILTER_CNT:
232 /* not a real value */
233 break;
234 }
235
236 if (!tx_type_valid || !rx_filter_valid)
237 return -ERANGE;
238
239 return 0;
240 }
241
dev_eth_ioctl(struct net_device * dev,struct ifreq * ifr,unsigned int cmd)242 static int dev_eth_ioctl(struct net_device *dev,
243 struct ifreq *ifr, unsigned int cmd)
244 {
245 const struct net_device_ops *ops = dev->netdev_ops;
246
247 if (!ops->ndo_eth_ioctl)
248 return -EOPNOTSUPP;
249
250 if (!netif_device_present(dev))
251 return -ENODEV;
252
253 return ops->ndo_eth_ioctl(dev, ifr, cmd);
254 }
255
256 /**
257 * dev_get_hwtstamp_phylib() - Get hardware timestamping settings of NIC
258 * or of attached phylib PHY
259 * @dev: Network device
260 * @cfg: Timestamping configuration structure
261 *
262 * Helper for enforcing a common policy that phylib timestamping, if available,
263 * should take precedence in front of hardware timestamping provided by the
264 * netdev.
265 *
266 * Note: phy_mii_ioctl() only handles SIOCSHWTSTAMP (not SIOCGHWTSTAMP), and
267 * there only exists a phydev->mii_ts->hwtstamp() method. So this will return
268 * -EOPNOTSUPP for phylib for now, which is still more accurate than letting
269 * the netdev handle the GET request.
270 */
dev_get_hwtstamp_phylib(struct net_device * dev,struct kernel_hwtstamp_config * cfg)271 static int dev_get_hwtstamp_phylib(struct net_device *dev,
272 struct kernel_hwtstamp_config *cfg)
273 {
274 if (phy_has_hwtstamp(dev->phydev))
275 return phy_hwtstamp_get(dev->phydev, cfg);
276
277 return dev->netdev_ops->ndo_hwtstamp_get(dev, cfg);
278 }
279
dev_get_hwtstamp(struct net_device * dev,struct ifreq * ifr)280 static int dev_get_hwtstamp(struct net_device *dev, struct ifreq *ifr)
281 {
282 const struct net_device_ops *ops = dev->netdev_ops;
283 struct kernel_hwtstamp_config kernel_cfg = {};
284 struct hwtstamp_config cfg;
285 int err;
286
287 if (!ops->ndo_hwtstamp_get)
288 return dev_eth_ioctl(dev, ifr, SIOCGHWTSTAMP); /* legacy */
289
290 if (!netif_device_present(dev))
291 return -ENODEV;
292
293 kernel_cfg.ifr = ifr;
294 err = dev_get_hwtstamp_phylib(dev, &kernel_cfg);
295 if (err)
296 return err;
297
298 /* If the request was resolved through an unconverted driver, omit
299 * the copy_to_user(), since the implementation has already done that
300 */
301 if (!kernel_cfg.copied_to_user) {
302 hwtstamp_config_from_kernel(&cfg, &kernel_cfg);
303
304 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
305 return -EFAULT;
306 }
307
308 return 0;
309 }
310
311 /**
312 * dev_set_hwtstamp_phylib() - Change hardware timestamping of NIC
313 * or of attached phylib PHY
314 * @dev: Network device
315 * @cfg: Timestamping configuration structure
316 * @extack: Netlink extended ack message structure, for error reporting
317 *
318 * Helper for enforcing a common policy that phylib timestamping, if available,
319 * should take precedence in front of hardware timestamping provided by the
320 * netdev. If the netdev driver needs to perform specific actions even for PHY
321 * timestamping to work properly (a switch port must trap the timestamped
322 * frames and not forward them), it must set IFF_SEE_ALL_HWTSTAMP_REQUESTS in
323 * dev->priv_flags.
324 */
dev_set_hwtstamp_phylib(struct net_device * dev,struct kernel_hwtstamp_config * cfg,struct netlink_ext_ack * extack)325 int dev_set_hwtstamp_phylib(struct net_device *dev,
326 struct kernel_hwtstamp_config *cfg,
327 struct netlink_ext_ack *extack)
328 {
329 const struct net_device_ops *ops = dev->netdev_ops;
330 bool phy_ts = phy_has_hwtstamp(dev->phydev);
331 struct kernel_hwtstamp_config old_cfg = {};
332 bool changed = false;
333 int err;
334
335 cfg->source = phy_ts ? HWTSTAMP_SOURCE_PHYLIB : HWTSTAMP_SOURCE_NETDEV;
336
337 if (phy_ts && (dev->priv_flags & IFF_SEE_ALL_HWTSTAMP_REQUESTS)) {
338 err = ops->ndo_hwtstamp_get(dev, &old_cfg);
339 if (err)
340 return err;
341 }
342
343 if (!phy_ts || (dev->priv_flags & IFF_SEE_ALL_HWTSTAMP_REQUESTS)) {
344 err = ops->ndo_hwtstamp_set(dev, cfg, extack);
345 if (err) {
346 if (extack->_msg)
347 netdev_err(dev, "%s\n", extack->_msg);
348 return err;
349 }
350 }
351
352 if (phy_ts && (dev->priv_flags & IFF_SEE_ALL_HWTSTAMP_REQUESTS))
353 changed = kernel_hwtstamp_config_changed(&old_cfg, cfg);
354
355 if (phy_ts) {
356 err = phy_hwtstamp_set(dev->phydev, cfg, extack);
357 if (err) {
358 if (changed)
359 ops->ndo_hwtstamp_set(dev, &old_cfg, NULL);
360 return err;
361 }
362 }
363
364 return 0;
365 }
366 EXPORT_SYMBOL_GPL(dev_set_hwtstamp_phylib);
367
dev_set_hwtstamp(struct net_device * dev,struct ifreq * ifr)368 static int dev_set_hwtstamp(struct net_device *dev, struct ifreq *ifr)
369 {
370 const struct net_device_ops *ops = dev->netdev_ops;
371 struct kernel_hwtstamp_config kernel_cfg = {};
372 struct netlink_ext_ack extack = {};
373 struct hwtstamp_config cfg;
374 int err;
375
376 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
377 return -EFAULT;
378
379 hwtstamp_config_to_kernel(&kernel_cfg, &cfg);
380 kernel_cfg.ifr = ifr;
381
382 err = net_hwtstamp_validate(&kernel_cfg);
383 if (err)
384 return err;
385
386 err = dsa_conduit_hwtstamp_validate(dev, &kernel_cfg, &extack);
387 if (err) {
388 if (extack._msg)
389 netdev_err(dev, "%s\n", extack._msg);
390 return err;
391 }
392
393 if (!ops->ndo_hwtstamp_set)
394 return dev_eth_ioctl(dev, ifr, SIOCSHWTSTAMP); /* legacy */
395
396 if (!netif_device_present(dev))
397 return -ENODEV;
398
399 err = dev_set_hwtstamp_phylib(dev, &kernel_cfg, &extack);
400 if (err)
401 return err;
402
403 /* The driver may have modified the configuration, so copy the
404 * updated version of it back to user space
405 */
406 if (!kernel_cfg.copied_to_user) {
407 hwtstamp_config_from_kernel(&cfg, &kernel_cfg);
408
409 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
410 return -EFAULT;
411 }
412
413 return 0;
414 }
415
generic_hwtstamp_ioctl_lower(struct net_device * dev,int cmd,struct kernel_hwtstamp_config * kernel_cfg)416 static int generic_hwtstamp_ioctl_lower(struct net_device *dev, int cmd,
417 struct kernel_hwtstamp_config *kernel_cfg)
418 {
419 struct ifreq ifrr;
420 int err;
421
422 strscpy_pad(ifrr.ifr_name, dev->name, IFNAMSIZ);
423 ifrr.ifr_ifru = kernel_cfg->ifr->ifr_ifru;
424
425 err = dev_eth_ioctl(dev, &ifrr, cmd);
426 if (err)
427 return err;
428
429 kernel_cfg->ifr->ifr_ifru = ifrr.ifr_ifru;
430 kernel_cfg->copied_to_user = true;
431
432 return 0;
433 }
434
generic_hwtstamp_get_lower(struct net_device * dev,struct kernel_hwtstamp_config * kernel_cfg)435 int generic_hwtstamp_get_lower(struct net_device *dev,
436 struct kernel_hwtstamp_config *kernel_cfg)
437 {
438 const struct net_device_ops *ops = dev->netdev_ops;
439
440 if (!netif_device_present(dev))
441 return -ENODEV;
442
443 if (ops->ndo_hwtstamp_get)
444 return dev_get_hwtstamp_phylib(dev, kernel_cfg);
445
446 /* Legacy path: unconverted lower driver */
447 return generic_hwtstamp_ioctl_lower(dev, SIOCGHWTSTAMP, kernel_cfg);
448 }
449 EXPORT_SYMBOL(generic_hwtstamp_get_lower);
450
generic_hwtstamp_set_lower(struct net_device * dev,struct kernel_hwtstamp_config * kernel_cfg,struct netlink_ext_ack * extack)451 int generic_hwtstamp_set_lower(struct net_device *dev,
452 struct kernel_hwtstamp_config *kernel_cfg,
453 struct netlink_ext_ack *extack)
454 {
455 const struct net_device_ops *ops = dev->netdev_ops;
456
457 if (!netif_device_present(dev))
458 return -ENODEV;
459
460 if (ops->ndo_hwtstamp_set)
461 return dev_set_hwtstamp_phylib(dev, kernel_cfg, extack);
462
463 /* Legacy path: unconverted lower driver */
464 return generic_hwtstamp_ioctl_lower(dev, SIOCSHWTSTAMP, kernel_cfg);
465 }
466 EXPORT_SYMBOL(generic_hwtstamp_set_lower);
467
dev_siocbond(struct net_device * dev,struct ifreq * ifr,unsigned int cmd)468 static int dev_siocbond(struct net_device *dev,
469 struct ifreq *ifr, unsigned int cmd)
470 {
471 const struct net_device_ops *ops = dev->netdev_ops;
472
473 if (ops->ndo_siocbond) {
474 if (netif_device_present(dev))
475 return ops->ndo_siocbond(dev, ifr, cmd);
476 else
477 return -ENODEV;
478 }
479
480 return -EOPNOTSUPP;
481 }
482
dev_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,unsigned int cmd)483 static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
484 void __user *data, unsigned int cmd)
485 {
486 const struct net_device_ops *ops = dev->netdev_ops;
487
488 if (ops->ndo_siocdevprivate) {
489 if (netif_device_present(dev))
490 return ops->ndo_siocdevprivate(dev, ifr, data, cmd);
491 else
492 return -ENODEV;
493 }
494
495 return -EOPNOTSUPP;
496 }
497
dev_siocwandev(struct net_device * dev,struct if_settings * ifs)498 static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs)
499 {
500 const struct net_device_ops *ops = dev->netdev_ops;
501
502 if (ops->ndo_siocwandev) {
503 if (netif_device_present(dev))
504 return ops->ndo_siocwandev(dev, ifs);
505 else
506 return -ENODEV;
507 }
508
509 return -EOPNOTSUPP;
510 }
511
512 /*
513 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
514 */
dev_ifsioc(struct net * net,struct ifreq * ifr,void __user * data,unsigned int cmd)515 static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
516 unsigned int cmd)
517 {
518 int err;
519 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
520 const struct net_device_ops *ops;
521 netdevice_tracker dev_tracker;
522
523 if (!dev)
524 return -ENODEV;
525
526 ops = dev->netdev_ops;
527
528 switch (cmd) {
529 case SIOCSIFFLAGS: /* Set interface flags */
530 return dev_change_flags(dev, ifr->ifr_flags, NULL);
531
532 case SIOCSIFMETRIC: /* Set the metric on the interface
533 (currently unused) */
534 return -EOPNOTSUPP;
535
536 case SIOCSIFMTU: /* Set the MTU of a device */
537 return dev_set_mtu(dev, ifr->ifr_mtu);
538
539 case SIOCSIFHWADDR:
540 if (dev->addr_len > sizeof(struct sockaddr))
541 return -EINVAL;
542 return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL);
543
544 case SIOCSIFHWBROADCAST:
545 if (ifr->ifr_hwaddr.sa_family != dev->type)
546 return -EINVAL;
547 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
548 min(sizeof(ifr->ifr_hwaddr.sa_data_min),
549 (size_t)dev->addr_len));
550 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
551 return 0;
552
553 case SIOCSIFMAP:
554 return dev_setifmap(dev, ifr);
555
556 case SIOCADDMULTI:
557 if (!ops->ndo_set_rx_mode ||
558 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
559 return -EINVAL;
560 if (!netif_device_present(dev))
561 return -ENODEV;
562 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
563
564 case SIOCDELMULTI:
565 if (!ops->ndo_set_rx_mode ||
566 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
567 return -EINVAL;
568 if (!netif_device_present(dev))
569 return -ENODEV;
570 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
571
572 case SIOCSIFTXQLEN:
573 if (ifr->ifr_qlen < 0)
574 return -EINVAL;
575 return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
576
577 case SIOCSIFNAME:
578 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
579 return dev_change_name(dev, ifr->ifr_newname);
580
581 case SIOCWANDEV:
582 return dev_siocwandev(dev, &ifr->ifr_settings);
583
584 case SIOCBRADDIF:
585 case SIOCBRDELIF:
586 if (!netif_device_present(dev))
587 return -ENODEV;
588 if (!netif_is_bridge_master(dev))
589 return -EOPNOTSUPP;
590 netdev_hold(dev, &dev_tracker, GFP_KERNEL);
591 rtnl_unlock();
592 err = br_ioctl_call(net, netdev_priv(dev), cmd, ifr, NULL);
593 netdev_put(dev, &dev_tracker);
594 rtnl_lock();
595 return err;
596
597 case SIOCDEVPRIVATE ... SIOCDEVPRIVATE + 15:
598 return dev_siocdevprivate(dev, ifr, data, cmd);
599
600 case SIOCSHWTSTAMP:
601 return dev_set_hwtstamp(dev, ifr);
602
603 case SIOCGHWTSTAMP:
604 return dev_get_hwtstamp(dev, ifr);
605
606 case SIOCGMIIPHY:
607 case SIOCGMIIREG:
608 case SIOCSMIIREG:
609 return dev_eth_ioctl(dev, ifr, cmd);
610
611 case SIOCBONDENSLAVE:
612 case SIOCBONDRELEASE:
613 case SIOCBONDSETHWADDR:
614 case SIOCBONDSLAVEINFOQUERY:
615 case SIOCBONDINFOQUERY:
616 case SIOCBONDCHANGEACTIVE:
617 return dev_siocbond(dev, ifr, cmd);
618
619 /* Unknown ioctl */
620 default:
621 err = -EINVAL;
622 }
623 return err;
624 }
625
626 /**
627 * dev_load - load a network module
628 * @net: the applicable net namespace
629 * @name: name of interface
630 *
631 * If a network interface is not present and the process has suitable
632 * privileges this function loads the module. If module loading is not
633 * available in this kernel then it becomes a nop.
634 */
635
dev_load(struct net * net,const char * name)636 void dev_load(struct net *net, const char *name)
637 {
638 struct net_device *dev;
639 int no_module;
640
641 rcu_read_lock();
642 dev = dev_get_by_name_rcu(net, name);
643 rcu_read_unlock();
644
645 no_module = !dev;
646 if (no_module && capable(CAP_NET_ADMIN))
647 no_module = request_module("netdev-%s", name);
648 if (no_module && capable(CAP_SYS_MODULE))
649 request_module("%s", name);
650 }
651 EXPORT_SYMBOL(dev_load);
652
653 /*
654 * This function handles all "interface"-type I/O control requests. The actual
655 * 'doing' part of this is dev_ifsioc above.
656 */
657
658 /**
659 * dev_ioctl - network device ioctl
660 * @net: the applicable net namespace
661 * @cmd: command to issue
662 * @ifr: pointer to a struct ifreq in user space
663 * @data: data exchanged with userspace
664 * @need_copyout: whether or not copy_to_user() should be called
665 *
666 * Issue ioctl functions to devices. This is normally called by the
667 * user space syscall interfaces but can sometimes be useful for
668 * other purposes. The return value is the return from the syscall if
669 * positive or a negative errno code on error.
670 */
671
dev_ioctl(struct net * net,unsigned int cmd,struct ifreq * ifr,void __user * data,bool * need_copyout)672 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
673 void __user *data, bool *need_copyout)
674 {
675 int ret;
676 char *colon;
677
678 if (need_copyout)
679 *need_copyout = true;
680 if (cmd == SIOCGIFNAME)
681 return dev_ifname(net, ifr);
682
683 ifr->ifr_name[IFNAMSIZ-1] = 0;
684
685 colon = strchr(ifr->ifr_name, ':');
686 if (colon)
687 *colon = 0;
688
689 /*
690 * See which interface the caller is talking about.
691 */
692
693 switch (cmd) {
694 case SIOCGIFHWADDR:
695 dev_load(net, ifr->ifr_name);
696 ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name);
697 if (colon)
698 *colon = ':';
699 return ret;
700 /*
701 * These ioctl calls:
702 * - can be done by all.
703 * - atomic and do not require locking.
704 * - return a value
705 */
706 case SIOCGIFFLAGS:
707 case SIOCGIFMETRIC:
708 case SIOCGIFMTU:
709 case SIOCGIFSLAVE:
710 case SIOCGIFMAP:
711 case SIOCGIFINDEX:
712 case SIOCGIFTXQLEN:
713 dev_load(net, ifr->ifr_name);
714 rcu_read_lock();
715 ret = dev_ifsioc_locked(net, ifr, cmd);
716 rcu_read_unlock();
717 if (colon)
718 *colon = ':';
719 return ret;
720
721 case SIOCETHTOOL:
722 dev_load(net, ifr->ifr_name);
723 ret = dev_ethtool(net, ifr, data);
724 if (colon)
725 *colon = ':';
726 return ret;
727
728 /*
729 * These ioctl calls:
730 * - require superuser power.
731 * - require strict serialization.
732 * - return a value
733 */
734 case SIOCGMIIPHY:
735 case SIOCGMIIREG:
736 case SIOCSIFNAME:
737 dev_load(net, ifr->ifr_name);
738 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
739 return -EPERM;
740 rtnl_lock();
741 ret = dev_ifsioc(net, ifr, data, cmd);
742 rtnl_unlock();
743 if (colon)
744 *colon = ':';
745 return ret;
746
747 /*
748 * These ioctl calls:
749 * - require superuser power.
750 * - require strict serialization.
751 * - do not return a value
752 */
753 case SIOCSIFMAP:
754 case SIOCSIFTXQLEN:
755 if (!capable(CAP_NET_ADMIN))
756 return -EPERM;
757 fallthrough;
758 /*
759 * These ioctl calls:
760 * - require local superuser power.
761 * - require strict serialization.
762 * - do not return a value
763 */
764 case SIOCSIFFLAGS:
765 case SIOCSIFMETRIC:
766 case SIOCSIFMTU:
767 case SIOCSIFHWADDR:
768 case SIOCSIFSLAVE:
769 case SIOCADDMULTI:
770 case SIOCDELMULTI:
771 case SIOCSIFHWBROADCAST:
772 case SIOCSMIIREG:
773 case SIOCBONDENSLAVE:
774 case SIOCBONDRELEASE:
775 case SIOCBONDSETHWADDR:
776 case SIOCBONDCHANGEACTIVE:
777 case SIOCBRADDIF:
778 case SIOCBRDELIF:
779 case SIOCSHWTSTAMP:
780 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
781 return -EPERM;
782 fallthrough;
783 case SIOCBONDSLAVEINFOQUERY:
784 case SIOCBONDINFOQUERY:
785 dev_load(net, ifr->ifr_name);
786 rtnl_lock();
787 ret = dev_ifsioc(net, ifr, data, cmd);
788 rtnl_unlock();
789 if (need_copyout)
790 *need_copyout = false;
791 return ret;
792
793 case SIOCGIFMEM:
794 /* Get the per device memory space. We can add this but
795 * currently do not support it */
796 case SIOCSIFMEM:
797 /* Set the per device memory buffer space.
798 * Not applicable in our case */
799 case SIOCSIFLINK:
800 return -ENOTTY;
801
802 /*
803 * Unknown or private ioctl.
804 */
805 default:
806 if (cmd == SIOCWANDEV ||
807 cmd == SIOCGHWTSTAMP ||
808 (cmd >= SIOCDEVPRIVATE &&
809 cmd <= SIOCDEVPRIVATE + 15)) {
810 dev_load(net, ifr->ifr_name);
811 rtnl_lock();
812 ret = dev_ifsioc(net, ifr, data, cmd);
813 rtnl_unlock();
814 return ret;
815 }
816 return -ENOTTY;
817 }
818 }
819