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 calling the default hardware provider timestamping.
263 *
264 * Note: phy_mii_ioctl() only handles SIOCSHWTSTAMP (not SIOCGHWTSTAMP), and
265 * there only exists a phydev->mii_ts->hwtstamp() method. So this will return
266 * -EOPNOTSUPP for phylib for now, which is still more accurate than letting
267 * the netdev handle the GET request.
268 */
dev_get_hwtstamp_phylib(struct net_device * dev,struct kernel_hwtstamp_config * cfg)269 static int dev_get_hwtstamp_phylib(struct net_device *dev,
270 struct kernel_hwtstamp_config *cfg)
271 {
272 if (phy_is_default_hwtstamp(dev->phydev))
273 return phy_hwtstamp_get(dev->phydev, cfg);
274
275 return dev->netdev_ops->ndo_hwtstamp_get(dev, cfg);
276 }
277
dev_get_hwtstamp(struct net_device * dev,struct ifreq * ifr)278 static int dev_get_hwtstamp(struct net_device *dev, struct ifreq *ifr)
279 {
280 const struct net_device_ops *ops = dev->netdev_ops;
281 struct kernel_hwtstamp_config kernel_cfg = {};
282 struct hwtstamp_config cfg;
283 int err;
284
285 if (!ops->ndo_hwtstamp_get)
286 return dev_eth_ioctl(dev, ifr, SIOCGHWTSTAMP); /* legacy */
287
288 if (!netif_device_present(dev))
289 return -ENODEV;
290
291 kernel_cfg.ifr = ifr;
292 err = dev_get_hwtstamp_phylib(dev, &kernel_cfg);
293 if (err)
294 return err;
295
296 /* If the request was resolved through an unconverted driver, omit
297 * the copy_to_user(), since the implementation has already done that
298 */
299 if (!kernel_cfg.copied_to_user) {
300 hwtstamp_config_from_kernel(&cfg, &kernel_cfg);
301
302 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
303 return -EFAULT;
304 }
305
306 return 0;
307 }
308
309 /**
310 * dev_set_hwtstamp_phylib() - Change hardware timestamping of NIC
311 * or of attached phylib PHY
312 * @dev: Network device
313 * @cfg: Timestamping configuration structure
314 * @extack: Netlink extended ack message structure, for error reporting
315 *
316 * Helper for enforcing a common policy that phylib timestamping, if available,
317 * should take precedence in front of hardware timestamping provided by the
318 * netdev. If the netdev driver needs to perform specific actions even for PHY
319 * timestamping to work properly (a switch port must trap the timestamped
320 * frames and not forward them), it must set dev->see_all_hwtstamp_requests.
321 */
dev_set_hwtstamp_phylib(struct net_device * dev,struct kernel_hwtstamp_config * cfg,struct netlink_ext_ack * extack)322 int dev_set_hwtstamp_phylib(struct net_device *dev,
323 struct kernel_hwtstamp_config *cfg,
324 struct netlink_ext_ack *extack)
325 {
326 const struct net_device_ops *ops = dev->netdev_ops;
327 bool phy_ts = phy_is_default_hwtstamp(dev->phydev);
328 struct kernel_hwtstamp_config old_cfg = {};
329 bool changed = false;
330 int err;
331
332 cfg->source = phy_ts ? HWTSTAMP_SOURCE_PHYLIB : HWTSTAMP_SOURCE_NETDEV;
333
334 if (phy_ts && dev->see_all_hwtstamp_requests) {
335 err = ops->ndo_hwtstamp_get(dev, &old_cfg);
336 if (err)
337 return err;
338 }
339
340 if (!phy_ts || dev->see_all_hwtstamp_requests) {
341 err = ops->ndo_hwtstamp_set(dev, cfg, extack);
342 if (err) {
343 if (extack->_msg)
344 netdev_err(dev, "%s\n", extack->_msg);
345 return err;
346 }
347 }
348
349 if (phy_ts && dev->see_all_hwtstamp_requests)
350 changed = kernel_hwtstamp_config_changed(&old_cfg, cfg);
351
352 if (phy_ts) {
353 err = phy_hwtstamp_set(dev->phydev, cfg, extack);
354 if (err) {
355 if (changed)
356 ops->ndo_hwtstamp_set(dev, &old_cfg, NULL);
357 return err;
358 }
359 }
360
361 return 0;
362 }
363
dev_set_hwtstamp(struct net_device * dev,struct ifreq * ifr)364 static int dev_set_hwtstamp(struct net_device *dev, struct ifreq *ifr)
365 {
366 const struct net_device_ops *ops = dev->netdev_ops;
367 struct kernel_hwtstamp_config kernel_cfg = {};
368 struct netlink_ext_ack extack = {};
369 struct hwtstamp_config cfg;
370 int err;
371
372 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
373 return -EFAULT;
374
375 hwtstamp_config_to_kernel(&kernel_cfg, &cfg);
376 kernel_cfg.ifr = ifr;
377
378 err = net_hwtstamp_validate(&kernel_cfg);
379 if (err)
380 return err;
381
382 err = dsa_conduit_hwtstamp_validate(dev, &kernel_cfg, &extack);
383 if (err) {
384 if (extack._msg)
385 netdev_err(dev, "%s\n", extack._msg);
386 return err;
387 }
388
389 if (!ops->ndo_hwtstamp_set)
390 return dev_eth_ioctl(dev, ifr, SIOCSHWTSTAMP); /* legacy */
391
392 if (!netif_device_present(dev))
393 return -ENODEV;
394
395 err = dev_set_hwtstamp_phylib(dev, &kernel_cfg, &extack);
396 if (err)
397 return err;
398
399 /* The driver may have modified the configuration, so copy the
400 * updated version of it back to user space
401 */
402 if (!kernel_cfg.copied_to_user) {
403 hwtstamp_config_from_kernel(&cfg, &kernel_cfg);
404
405 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
406 return -EFAULT;
407 }
408
409 return 0;
410 }
411
generic_hwtstamp_ioctl_lower(struct net_device * dev,int cmd,struct kernel_hwtstamp_config * kernel_cfg)412 static int generic_hwtstamp_ioctl_lower(struct net_device *dev, int cmd,
413 struct kernel_hwtstamp_config *kernel_cfg)
414 {
415 struct ifreq ifrr;
416 int err;
417
418 strscpy_pad(ifrr.ifr_name, dev->name, IFNAMSIZ);
419 ifrr.ifr_ifru = kernel_cfg->ifr->ifr_ifru;
420
421 err = dev_eth_ioctl(dev, &ifrr, cmd);
422 if (err)
423 return err;
424
425 kernel_cfg->ifr->ifr_ifru = ifrr.ifr_ifru;
426 kernel_cfg->copied_to_user = true;
427
428 return 0;
429 }
430
generic_hwtstamp_get_lower(struct net_device * dev,struct kernel_hwtstamp_config * kernel_cfg)431 int generic_hwtstamp_get_lower(struct net_device *dev,
432 struct kernel_hwtstamp_config *kernel_cfg)
433 {
434 const struct net_device_ops *ops = dev->netdev_ops;
435
436 if (!netif_device_present(dev))
437 return -ENODEV;
438
439 if (ops->ndo_hwtstamp_get)
440 return dev_get_hwtstamp_phylib(dev, kernel_cfg);
441
442 /* Legacy path: unconverted lower driver */
443 return generic_hwtstamp_ioctl_lower(dev, SIOCGHWTSTAMP, kernel_cfg);
444 }
445 EXPORT_SYMBOL(generic_hwtstamp_get_lower);
446
generic_hwtstamp_set_lower(struct net_device * dev,struct kernel_hwtstamp_config * kernel_cfg,struct netlink_ext_ack * extack)447 int generic_hwtstamp_set_lower(struct net_device *dev,
448 struct kernel_hwtstamp_config *kernel_cfg,
449 struct netlink_ext_ack *extack)
450 {
451 const struct net_device_ops *ops = dev->netdev_ops;
452
453 if (!netif_device_present(dev))
454 return -ENODEV;
455
456 if (ops->ndo_hwtstamp_set)
457 return dev_set_hwtstamp_phylib(dev, kernel_cfg, extack);
458
459 /* Legacy path: unconverted lower driver */
460 return generic_hwtstamp_ioctl_lower(dev, SIOCSHWTSTAMP, kernel_cfg);
461 }
462 EXPORT_SYMBOL(generic_hwtstamp_set_lower);
463
dev_siocbond(struct net_device * dev,struct ifreq * ifr,unsigned int cmd)464 static int dev_siocbond(struct net_device *dev,
465 struct ifreq *ifr, unsigned int cmd)
466 {
467 const struct net_device_ops *ops = dev->netdev_ops;
468
469 if (ops->ndo_siocbond) {
470 if (netif_device_present(dev))
471 return ops->ndo_siocbond(dev, ifr, cmd);
472 else
473 return -ENODEV;
474 }
475
476 return -EOPNOTSUPP;
477 }
478
dev_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,unsigned int cmd)479 static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
480 void __user *data, unsigned int cmd)
481 {
482 const struct net_device_ops *ops = dev->netdev_ops;
483
484 if (ops->ndo_siocdevprivate) {
485 if (netif_device_present(dev))
486 return ops->ndo_siocdevprivate(dev, ifr, data, cmd);
487 else
488 return -ENODEV;
489 }
490
491 return -EOPNOTSUPP;
492 }
493
dev_siocwandev(struct net_device * dev,struct if_settings * ifs)494 static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs)
495 {
496 const struct net_device_ops *ops = dev->netdev_ops;
497
498 if (ops->ndo_siocwandev) {
499 if (netif_device_present(dev))
500 return ops->ndo_siocwandev(dev, ifs);
501 else
502 return -ENODEV;
503 }
504
505 return -EOPNOTSUPP;
506 }
507
508 /*
509 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
510 */
dev_ifsioc(struct net * net,struct ifreq * ifr,void __user * data,unsigned int cmd)511 static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
512 unsigned int cmd)
513 {
514 int err;
515 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
516 const struct net_device_ops *ops;
517 netdevice_tracker dev_tracker;
518
519 if (!dev)
520 return -ENODEV;
521
522 ops = dev->netdev_ops;
523
524 switch (cmd) {
525 case SIOCSIFFLAGS: /* Set interface flags */
526 return dev_change_flags(dev, ifr->ifr_flags, NULL);
527
528 case SIOCSIFMETRIC: /* Set the metric on the interface
529 (currently unused) */
530 return -EOPNOTSUPP;
531
532 case SIOCSIFMTU: /* Set the MTU of a device */
533 return dev_set_mtu(dev, ifr->ifr_mtu);
534
535 case SIOCSIFHWADDR:
536 if (dev->addr_len > sizeof(struct sockaddr))
537 return -EINVAL;
538 return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL);
539
540 case SIOCSIFHWBROADCAST:
541 if (ifr->ifr_hwaddr.sa_family != dev->type)
542 return -EINVAL;
543 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
544 min(sizeof(ifr->ifr_hwaddr.sa_data_min),
545 (size_t)dev->addr_len));
546 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
547 return 0;
548
549 case SIOCSIFMAP:
550 return dev_setifmap(dev, ifr);
551
552 case SIOCADDMULTI:
553 if (!ops->ndo_set_rx_mode ||
554 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
555 return -EINVAL;
556 if (!netif_device_present(dev))
557 return -ENODEV;
558 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
559
560 case SIOCDELMULTI:
561 if (!ops->ndo_set_rx_mode ||
562 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
563 return -EINVAL;
564 if (!netif_device_present(dev))
565 return -ENODEV;
566 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
567
568 case SIOCSIFTXQLEN:
569 if (ifr->ifr_qlen < 0)
570 return -EINVAL;
571 return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
572
573 case SIOCSIFNAME:
574 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
575 return dev_change_name(dev, ifr->ifr_newname);
576
577 case SIOCWANDEV:
578 return dev_siocwandev(dev, &ifr->ifr_settings);
579
580 case SIOCBRADDIF:
581 case SIOCBRDELIF:
582 if (!netif_device_present(dev))
583 return -ENODEV;
584 if (!netif_is_bridge_master(dev))
585 return -EOPNOTSUPP;
586 netdev_hold(dev, &dev_tracker, GFP_KERNEL);
587 rtnl_unlock();
588 err = br_ioctl_call(net, netdev_priv(dev), cmd, ifr, NULL);
589 netdev_put(dev, &dev_tracker);
590 rtnl_lock();
591 return err;
592
593 case SIOCDEVPRIVATE ... SIOCDEVPRIVATE + 15:
594 return dev_siocdevprivate(dev, ifr, data, cmd);
595
596 case SIOCSHWTSTAMP:
597 return dev_set_hwtstamp(dev, ifr);
598
599 case SIOCGHWTSTAMP:
600 return dev_get_hwtstamp(dev, ifr);
601
602 case SIOCGMIIPHY:
603 case SIOCGMIIREG:
604 case SIOCSMIIREG:
605 return dev_eth_ioctl(dev, ifr, cmd);
606
607 case SIOCBONDENSLAVE:
608 case SIOCBONDRELEASE:
609 case SIOCBONDSETHWADDR:
610 case SIOCBONDSLAVEINFOQUERY:
611 case SIOCBONDINFOQUERY:
612 case SIOCBONDCHANGEACTIVE:
613 return dev_siocbond(dev, ifr, cmd);
614
615 /* Unknown ioctl */
616 default:
617 err = -EINVAL;
618 }
619 return err;
620 }
621
622 /**
623 * dev_load - load a network module
624 * @net: the applicable net namespace
625 * @name: name of interface
626 *
627 * If a network interface is not present and the process has suitable
628 * privileges this function loads the module. If module loading is not
629 * available in this kernel then it becomes a nop.
630 */
631
dev_load(struct net * net,const char * name)632 void dev_load(struct net *net, const char *name)
633 {
634 struct net_device *dev;
635 int no_module;
636
637 rcu_read_lock();
638 dev = dev_get_by_name_rcu(net, name);
639 rcu_read_unlock();
640
641 no_module = !dev;
642 if (no_module && capable(CAP_NET_ADMIN))
643 no_module = request_module("netdev-%s", name);
644 if (no_module && capable(CAP_SYS_MODULE))
645 request_module("%s", name);
646 }
647 EXPORT_SYMBOL(dev_load);
648
649 /*
650 * This function handles all "interface"-type I/O control requests. The actual
651 * 'doing' part of this is dev_ifsioc above.
652 */
653
654 /**
655 * dev_ioctl - network device ioctl
656 * @net: the applicable net namespace
657 * @cmd: command to issue
658 * @ifr: pointer to a struct ifreq in user space
659 * @data: data exchanged with userspace
660 * @need_copyout: whether or not copy_to_user() should be called
661 *
662 * Issue ioctl functions to devices. This is normally called by the
663 * user space syscall interfaces but can sometimes be useful for
664 * other purposes. The return value is the return from the syscall if
665 * positive or a negative errno code on error.
666 */
667
dev_ioctl(struct net * net,unsigned int cmd,struct ifreq * ifr,void __user * data,bool * need_copyout)668 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
669 void __user *data, bool *need_copyout)
670 {
671 int ret;
672 char *colon;
673
674 if (need_copyout)
675 *need_copyout = true;
676 if (cmd == SIOCGIFNAME)
677 return dev_ifname(net, ifr);
678
679 ifr->ifr_name[IFNAMSIZ-1] = 0;
680
681 colon = strchr(ifr->ifr_name, ':');
682 if (colon)
683 *colon = 0;
684
685 /*
686 * See which interface the caller is talking about.
687 */
688
689 switch (cmd) {
690 case SIOCGIFHWADDR:
691 dev_load(net, ifr->ifr_name);
692 ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name);
693 if (colon)
694 *colon = ':';
695 return ret;
696 /*
697 * These ioctl calls:
698 * - can be done by all.
699 * - atomic and do not require locking.
700 * - return a value
701 */
702 case SIOCGIFFLAGS:
703 case SIOCGIFMETRIC:
704 case SIOCGIFMTU:
705 case SIOCGIFSLAVE:
706 case SIOCGIFMAP:
707 case SIOCGIFINDEX:
708 case SIOCGIFTXQLEN:
709 dev_load(net, ifr->ifr_name);
710 rcu_read_lock();
711 ret = dev_ifsioc_locked(net, ifr, cmd);
712 rcu_read_unlock();
713 if (colon)
714 *colon = ':';
715 return ret;
716
717 case SIOCETHTOOL:
718 dev_load(net, ifr->ifr_name);
719 ret = dev_ethtool(net, ifr, data);
720 if (colon)
721 *colon = ':';
722 return ret;
723
724 /*
725 * These ioctl calls:
726 * - require superuser power.
727 * - require strict serialization.
728 * - return a value
729 */
730 case SIOCGMIIPHY:
731 case SIOCGMIIREG:
732 case SIOCSIFNAME:
733 dev_load(net, ifr->ifr_name);
734 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
735 return -EPERM;
736 rtnl_lock();
737 ret = dev_ifsioc(net, ifr, data, cmd);
738 rtnl_unlock();
739 if (colon)
740 *colon = ':';
741 return ret;
742
743 /*
744 * These ioctl calls:
745 * - require superuser power.
746 * - require strict serialization.
747 * - do not return a value
748 */
749 case SIOCSIFMAP:
750 case SIOCSIFTXQLEN:
751 if (!capable(CAP_NET_ADMIN))
752 return -EPERM;
753 fallthrough;
754 /*
755 * These ioctl calls:
756 * - require local superuser power.
757 * - require strict serialization.
758 * - do not return a value
759 */
760 case SIOCSIFFLAGS:
761 case SIOCSIFMETRIC:
762 case SIOCSIFMTU:
763 case SIOCSIFHWADDR:
764 case SIOCSIFSLAVE:
765 case SIOCADDMULTI:
766 case SIOCDELMULTI:
767 case SIOCSIFHWBROADCAST:
768 case SIOCSMIIREG:
769 case SIOCBONDENSLAVE:
770 case SIOCBONDRELEASE:
771 case SIOCBONDSETHWADDR:
772 case SIOCBONDCHANGEACTIVE:
773 case SIOCBRADDIF:
774 case SIOCBRDELIF:
775 case SIOCSHWTSTAMP:
776 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
777 return -EPERM;
778 fallthrough;
779 case SIOCBONDSLAVEINFOQUERY:
780 case SIOCBONDINFOQUERY:
781 dev_load(net, ifr->ifr_name);
782 rtnl_lock();
783 ret = dev_ifsioc(net, ifr, data, cmd);
784 rtnl_unlock();
785 if (need_copyout)
786 *need_copyout = false;
787 return ret;
788
789 case SIOCGIFMEM:
790 /* Get the per device memory space. We can add this but
791 * currently do not support it */
792 case SIOCSIFMEM:
793 /* Set the per device memory buffer space.
794 * Not applicable in our case */
795 case SIOCSIFLINK:
796 return -ENOTTY;
797
798 /*
799 * Unknown or private ioctl.
800 */
801 default:
802 if (cmd == SIOCWANDEV ||
803 cmd == SIOCGHWTSTAMP ||
804 (cmd >= SIOCDEVPRIVATE &&
805 cmd <= SIOCDEVPRIVATE + 15)) {
806 dev_load(net, ifr->ifr_name);
807 rtnl_lock();
808 ret = dev_ifsioc(net, ifr, data, cmd);
809 rtnl_unlock();
810 return ret;
811 }
812 return -ENOTTY;
813 }
814 }
815