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/ptp_clock_kernel.h>
10 #include <linux/wireless.h>
11 #include <linux/if_bridge.h>
12 #include <net/dsa_stubs.h>
13 #include <net/netdev_lock.h>
14 #include <net/wext.h>
15
16 #include "dev.h"
17
18 /*
19 * Map an interface index to its name (SIOCGIFNAME)
20 */
21
22 /*
23 * We need this ioctl for efficient implementation of the
24 * if_indextoname() function required by the IPv6 API. Without
25 * it, we would have to search all the interfaces to find a
26 * match. --pb
27 */
28
dev_ifname(struct net * net,struct ifreq * ifr)29 static int dev_ifname(struct net *net, struct ifreq *ifr)
30 {
31 ifr->ifr_name[IFNAMSIZ-1] = 0;
32 return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
33 }
34
35 /*
36 * Perform a SIOCGIFCONF call. This structure will change
37 * size eventually, and there is nothing I can do about it.
38 * Thus we will need a 'compatibility mode'.
39 */
dev_ifconf(struct net * net,struct ifconf __user * uifc)40 int dev_ifconf(struct net *net, struct ifconf __user *uifc)
41 {
42 struct net_device *dev;
43 void __user *pos;
44 size_t size;
45 int len, total = 0, done;
46
47 /* both the ifconf and the ifreq structures are slightly different */
48 if (in_compat_syscall()) {
49 struct compat_ifconf ifc32;
50
51 if (copy_from_user(&ifc32, uifc, sizeof(struct compat_ifconf)))
52 return -EFAULT;
53
54 pos = compat_ptr(ifc32.ifcbuf);
55 len = ifc32.ifc_len;
56 size = sizeof(struct compat_ifreq);
57 } else {
58 struct ifconf ifc;
59
60 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
61 return -EFAULT;
62
63 pos = ifc.ifc_buf;
64 len = ifc.ifc_len;
65 size = sizeof(struct ifreq);
66 }
67
68 /* Loop over the interfaces, and write an info block for each. */
69 rtnl_net_lock(net);
70 for_each_netdev(net, dev) {
71 if (!pos)
72 done = inet_gifconf(dev, NULL, 0, size);
73 else
74 done = inet_gifconf(dev, pos + total,
75 len - total, size);
76 if (done < 0) {
77 rtnl_net_unlock(net);
78 return -EFAULT;
79 }
80 total += done;
81 }
82 rtnl_net_unlock(net);
83
84 return put_user(total, &uifc->ifc_len);
85 }
86
dev_getifmap(struct net_device * dev,struct ifreq * ifr)87 static int dev_getifmap(struct net_device *dev, struct ifreq *ifr)
88 {
89 struct ifmap *ifmap = &ifr->ifr_map;
90
91 if (in_compat_syscall()) {
92 struct compat_ifmap *cifmap = (struct compat_ifmap *)ifmap;
93
94 cifmap->mem_start = dev->mem_start;
95 cifmap->mem_end = dev->mem_end;
96 cifmap->base_addr = dev->base_addr;
97 cifmap->irq = dev->irq;
98 cifmap->dma = dev->dma;
99 cifmap->port = dev->if_port;
100
101 return 0;
102 }
103
104 ifmap->mem_start = dev->mem_start;
105 ifmap->mem_end = dev->mem_end;
106 ifmap->base_addr = dev->base_addr;
107 ifmap->irq = dev->irq;
108 ifmap->dma = dev->dma;
109 ifmap->port = dev->if_port;
110
111 return 0;
112 }
113
netif_setifmap(struct net_device * dev,struct ifreq * ifr)114 static int netif_setifmap(struct net_device *dev, struct ifreq *ifr)
115 {
116 struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map;
117
118 if (!dev->netdev_ops->ndo_set_config)
119 return -EOPNOTSUPP;
120
121 if (in_compat_syscall()) {
122 struct ifmap ifmap = {
123 .mem_start = cifmap->mem_start,
124 .mem_end = cifmap->mem_end,
125 .base_addr = cifmap->base_addr,
126 .irq = cifmap->irq,
127 .dma = cifmap->dma,
128 .port = cifmap->port,
129 };
130
131 return dev->netdev_ops->ndo_set_config(dev, &ifmap);
132 }
133
134 return dev->netdev_ops->ndo_set_config(dev, &ifr->ifr_map);
135 }
136
137 /*
138 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
139 */
dev_ifsioc_locked(struct net * net,struct ifreq * ifr,unsigned int cmd)140 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
141 {
142 int err;
143 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
144
145 if (!dev)
146 return -ENODEV;
147
148 switch (cmd) {
149 case SIOCGIFFLAGS: /* Get interface flags */
150 ifr->ifr_flags = (short)netif_get_flags(dev);
151 return 0;
152
153 case SIOCGIFMETRIC: /* Get the metric on the interface
154 (currently unused) */
155 ifr->ifr_metric = 0;
156 return 0;
157
158 case SIOCGIFMTU: /* Get the MTU of a device */
159 ifr->ifr_mtu = dev->mtu;
160 return 0;
161
162 case SIOCGIFSLAVE:
163 err = -EINVAL;
164 break;
165
166 case SIOCGIFMAP:
167 return dev_getifmap(dev, ifr);
168
169 case SIOCGIFINDEX:
170 ifr->ifr_ifindex = dev->ifindex;
171 return 0;
172
173 case SIOCGIFTXQLEN:
174 ifr->ifr_qlen = dev->tx_queue_len;
175 return 0;
176
177 default:
178 /* dev_ioctl() should ensure this case
179 * is never reached
180 */
181 WARN_ON(1);
182 err = -ENOTTY;
183 break;
184
185 }
186 return err;
187 }
188
net_hwtstamp_validate(const struct kernel_hwtstamp_config * cfg)189 int net_hwtstamp_validate(const struct kernel_hwtstamp_config *cfg)
190 {
191 enum hwtstamp_tx_types tx_type;
192 enum hwtstamp_rx_filters rx_filter;
193 int tx_type_valid = 0;
194 int rx_filter_valid = 0;
195
196 if (cfg->flags & ~HWTSTAMP_FLAG_MASK)
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 case HWTSTAMP_TX_ONESTEP_P2P:
207 tx_type_valid = 1;
208 break;
209 case __HWTSTAMP_TX_CNT:
210 /* not a real value */
211 break;
212 }
213
214 switch (rx_filter) {
215 case HWTSTAMP_FILTER_NONE:
216 case HWTSTAMP_FILTER_ALL:
217 case HWTSTAMP_FILTER_SOME:
218 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
219 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
220 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
221 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
222 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
223 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
224 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
225 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
226 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
227 case HWTSTAMP_FILTER_PTP_V2_EVENT:
228 case HWTSTAMP_FILTER_PTP_V2_SYNC:
229 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
230 case HWTSTAMP_FILTER_NTP_ALL:
231 rx_filter_valid = 1;
232 break;
233 case __HWTSTAMP_FILTER_CNT:
234 /* not a real value */
235 break;
236 }
237
238 if (!tx_type_valid || !rx_filter_valid)
239 return -ERANGE;
240
241 return 0;
242 }
243
244 /**
245 * dev_get_hwtstamp_phylib() - Get hardware timestamping settings of NIC
246 * or of attached phylib PHY
247 * @dev: Network device
248 * @cfg: Timestamping configuration structure
249 *
250 * Helper for calling the default hardware provider timestamping.
251 *
252 * Note: phy_mii_ioctl() only handles SIOCSHWTSTAMP (not SIOCGHWTSTAMP), but
253 * phydev->mii_ts has both hwtstamp_get() and hwtstamp_set() methods. So this
254 * will return -EOPNOTSUPP for phylib only if hwtstamp_get() is not
255 * implemented for now, which is still more accurate than letting the netdev
256 * handle the GET request.
257 */
dev_get_hwtstamp_phylib(struct net_device * dev,struct kernel_hwtstamp_config * cfg)258 int dev_get_hwtstamp_phylib(struct net_device *dev,
259 struct kernel_hwtstamp_config *cfg)
260 {
261 struct hwtstamp_provider *hwprov;
262
263 hwprov = rtnl_dereference(dev->hwprov);
264 if (hwprov) {
265 cfg->qualifier = hwprov->desc.qualifier;
266 if (hwprov->source == HWTSTAMP_SOURCE_PHYLIB &&
267 hwprov->phydev)
268 return phy_hwtstamp_get(hwprov->phydev, cfg);
269
270 if (hwprov->source == HWTSTAMP_SOURCE_NETDEV)
271 return dev->netdev_ops->ndo_hwtstamp_get(dev, cfg);
272
273 return -EOPNOTSUPP;
274 }
275
276 if (phy_is_default_hwtstamp(dev->phydev))
277 return phy_hwtstamp_get(dev->phydev, cfg);
278
279 return dev->netdev_ops->ndo_hwtstamp_get(dev, cfg);
280 }
281
dev_get_hwtstamp(struct net_device * dev,struct ifreq * ifr)282 static int dev_get_hwtstamp(struct net_device *dev, struct ifreq *ifr)
283 {
284 const struct net_device_ops *ops = dev->netdev_ops;
285 struct kernel_hwtstamp_config kernel_cfg = {};
286 struct hwtstamp_config cfg;
287 int err;
288
289 if (!ops->ndo_hwtstamp_get)
290 return -EOPNOTSUPP;
291
292 if (!netif_device_present(dev))
293 return -ENODEV;
294
295 kernel_cfg.ifr = ifr;
296 netdev_lock_ops(dev);
297 err = dev_get_hwtstamp_phylib(dev, &kernel_cfg);
298 netdev_unlock_ops(dev);
299 if (err)
300 return err;
301
302 /* If the request was resolved through an unconverted driver, omit
303 * the copy_to_user(), since the implementation has already done that
304 */
305 if (!kernel_cfg.copied_to_user) {
306 hwtstamp_config_from_kernel(&cfg, &kernel_cfg);
307
308 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
309 return -EFAULT;
310 }
311
312 return 0;
313 }
314
315 /**
316 * dev_set_hwtstamp_phylib() - Change hardware timestamping of NIC
317 * or of attached phylib PHY
318 * @dev: Network device
319 * @cfg: Timestamping configuration structure
320 * @extack: Netlink extended ack message structure, for error reporting
321 *
322 * Helper for enforcing a common policy that phylib timestamping, if available,
323 * should take precedence in front of hardware timestamping provided by the
324 * netdev. If the netdev driver needs to perform specific actions even for PHY
325 * timestamping to work properly (a switch port must trap the timestamped
326 * frames and not forward them), it must set dev->see_all_hwtstamp_requests.
327 */
dev_set_hwtstamp_phylib(struct net_device * dev,struct kernel_hwtstamp_config * cfg,struct netlink_ext_ack * extack)328 int dev_set_hwtstamp_phylib(struct net_device *dev,
329 struct kernel_hwtstamp_config *cfg,
330 struct netlink_ext_ack *extack)
331 {
332 const struct net_device_ops *ops = dev->netdev_ops;
333 struct kernel_hwtstamp_config old_cfg = {};
334 struct hwtstamp_provider *hwprov;
335 struct phy_device *phydev;
336 bool changed = false;
337 bool phy_ts;
338 int err;
339
340 hwprov = rtnl_dereference(dev->hwprov);
341 if (hwprov) {
342 if (hwprov->source == HWTSTAMP_SOURCE_PHYLIB &&
343 hwprov->phydev) {
344 phy_ts = true;
345 phydev = hwprov->phydev;
346 } else if (hwprov->source == HWTSTAMP_SOURCE_NETDEV) {
347 phy_ts = false;
348 } else {
349 return -EOPNOTSUPP;
350 }
351
352 cfg->qualifier = hwprov->desc.qualifier;
353 } else {
354 phy_ts = phy_is_default_hwtstamp(dev->phydev);
355 if (phy_ts)
356 phydev = dev->phydev;
357 }
358
359 cfg->source = phy_ts ? HWTSTAMP_SOURCE_PHYLIB : HWTSTAMP_SOURCE_NETDEV;
360
361 if (phy_ts && dev->see_all_hwtstamp_requests) {
362 err = ops->ndo_hwtstamp_get(dev, &old_cfg);
363 if (err)
364 return err;
365 }
366
367 if (!phy_ts || dev->see_all_hwtstamp_requests) {
368 err = ops->ndo_hwtstamp_set(dev, cfg, extack);
369 if (err) {
370 if (extack->_msg)
371 netdev_err(dev, "%s\n", extack->_msg);
372 return err;
373 }
374 }
375
376 if (phy_ts && dev->see_all_hwtstamp_requests)
377 changed = kernel_hwtstamp_config_changed(&old_cfg, cfg);
378
379 if (phy_ts) {
380 err = phy_hwtstamp_set(phydev, cfg, extack);
381 if (err) {
382 if (changed)
383 ops->ndo_hwtstamp_set(dev, &old_cfg, NULL);
384 return err;
385 }
386 }
387
388 return 0;
389 }
390
dev_set_hwtstamp(struct net_device * dev,struct ifreq * ifr)391 static int dev_set_hwtstamp(struct net_device *dev, struct ifreq *ifr)
392 {
393 const struct net_device_ops *ops = dev->netdev_ops;
394 struct kernel_hwtstamp_config kernel_cfg = {};
395 struct netlink_ext_ack extack = {};
396 struct hwtstamp_config cfg;
397 int err;
398
399 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
400 return -EFAULT;
401
402 hwtstamp_config_to_kernel(&kernel_cfg, &cfg);
403 kernel_cfg.ifr = ifr;
404
405 err = net_hwtstamp_validate(&kernel_cfg);
406 if (err)
407 return err;
408
409 err = dsa_conduit_hwtstamp_validate(dev, &kernel_cfg, &extack);
410 if (err) {
411 if (extack._msg)
412 netdev_err(dev, "%s\n", extack._msg);
413 return err;
414 }
415
416 if (!ops->ndo_hwtstamp_set)
417 return -EOPNOTSUPP;
418
419 if (!netif_device_present(dev))
420 return -ENODEV;
421
422 netdev_lock_ops(dev);
423 err = dev_set_hwtstamp_phylib(dev, &kernel_cfg, &extack);
424 netdev_unlock_ops(dev);
425 if (err)
426 return err;
427
428 /* The driver may have modified the configuration, so copy the
429 * updated version of it back to user space
430 */
431 if (!kernel_cfg.copied_to_user) {
432 hwtstamp_config_from_kernel(&cfg, &kernel_cfg);
433
434 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
435 return -EFAULT;
436 }
437
438 return 0;
439 }
440
generic_hwtstamp_get_lower(struct net_device * dev,struct kernel_hwtstamp_config * kernel_cfg)441 int generic_hwtstamp_get_lower(struct net_device *dev,
442 struct kernel_hwtstamp_config *kernel_cfg)
443 {
444 const struct net_device_ops *ops = dev->netdev_ops;
445 int err;
446
447 if (!netif_device_present(dev))
448 return -ENODEV;
449
450 if (!ops->ndo_hwtstamp_get)
451 return -EOPNOTSUPP;
452
453 netdev_lock_ops(dev);
454 err = dev_get_hwtstamp_phylib(dev, kernel_cfg);
455 netdev_unlock_ops(dev);
456
457 return err;
458 }
459 EXPORT_SYMBOL(generic_hwtstamp_get_lower);
460
generic_hwtstamp_set_lower(struct net_device * dev,struct kernel_hwtstamp_config * kernel_cfg,struct netlink_ext_ack * extack)461 int generic_hwtstamp_set_lower(struct net_device *dev,
462 struct kernel_hwtstamp_config *kernel_cfg,
463 struct netlink_ext_ack *extack)
464 {
465 const struct net_device_ops *ops = dev->netdev_ops;
466 int err;
467
468 if (!netif_device_present(dev))
469 return -ENODEV;
470
471 if (!ops->ndo_hwtstamp_set)
472 return -EOPNOTSUPP;
473
474 netdev_lock_ops(dev);
475 err = dev_set_hwtstamp_phylib(dev, kernel_cfg, extack);
476 netdev_unlock_ops(dev);
477
478 return err;
479 }
480 EXPORT_SYMBOL(generic_hwtstamp_set_lower);
481
dev_siocbond(struct net_device * dev,struct ifreq * ifr,unsigned int cmd)482 static int dev_siocbond(struct net_device *dev,
483 struct ifreq *ifr, unsigned int cmd)
484 {
485 const struct net_device_ops *ops = dev->netdev_ops;
486
487 if (ops->ndo_siocbond) {
488 int ret = -ENODEV;
489
490 netdev_lock_ops(dev);
491 if (netif_device_present(dev))
492 ret = ops->ndo_siocbond(dev, ifr, cmd);
493 netdev_unlock_ops(dev);
494
495 return ret;
496 }
497
498 return -EOPNOTSUPP;
499 }
500
dev_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,unsigned int cmd)501 static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
502 void __user *data, unsigned int cmd)
503 {
504 const struct net_device_ops *ops = dev->netdev_ops;
505
506 if (ops->ndo_siocdevprivate) {
507 int ret = -ENODEV;
508
509 netdev_lock_ops(dev);
510 if (netif_device_present(dev))
511 ret = ops->ndo_siocdevprivate(dev, ifr, data, cmd);
512 netdev_unlock_ops(dev);
513
514 return ret;
515 }
516
517 return -EOPNOTSUPP;
518 }
519
dev_siocwandev(struct net_device * dev,struct if_settings * ifs)520 static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs)
521 {
522 const struct net_device_ops *ops = dev->netdev_ops;
523
524 if (ops->ndo_siocwandev) {
525 int ret = -ENODEV;
526
527 netdev_lock_ops(dev);
528 if (netif_device_present(dev))
529 ret = ops->ndo_siocwandev(dev, ifs);
530 netdev_unlock_ops(dev);
531
532 return ret;
533 }
534
535 return -EOPNOTSUPP;
536 }
537
538 /*
539 * Perform the SIOCxIFxxx calls, inside rtnl_net_lock()
540 */
dev_ifsioc(struct net * net,struct ifreq * ifr,void __user * data,unsigned int cmd)541 static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
542 unsigned int cmd)
543 {
544 int err;
545 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
546 const struct net_device_ops *ops;
547
548 if (!dev)
549 return -ENODEV;
550
551 ops = dev->netdev_ops;
552
553 switch (cmd) {
554 case SIOCSIFFLAGS: /* Set interface flags */
555 return dev_change_flags(dev, ifr->ifr_flags, NULL);
556
557 case SIOCSIFMETRIC: /* Set the metric on the interface
558 (currently unused) */
559 return -EOPNOTSUPP;
560
561 case SIOCSIFMTU: /* Set the MTU of a device */
562 return dev_set_mtu(dev, ifr->ifr_mtu);
563
564 case SIOCSIFHWADDR:
565 if (dev->addr_len > sizeof(ifr->ifr_hwaddr))
566 return -EINVAL;
567 return dev_set_mac_address_user(dev,
568 (struct sockaddr_storage *)&ifr->ifr_hwaddr,
569 NULL);
570
571 case SIOCSIFHWBROADCAST:
572 if (ifr->ifr_hwaddr.sa_family != dev->type)
573 return -EINVAL;
574 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
575 min(sizeof(ifr->ifr_hwaddr.sa_data),
576 (size_t)dev->addr_len));
577 netdev_lock_ops(dev);
578 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
579 netdev_unlock_ops(dev);
580 return 0;
581
582 case SIOCSIFMAP:
583 netdev_lock_ops(dev);
584 err = netif_setifmap(dev, ifr);
585 netdev_unlock_ops(dev);
586 return err;
587
588 case SIOCADDMULTI:
589 if (!ops->ndo_set_rx_mode ||
590 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
591 return -EINVAL;
592 if (!netif_device_present(dev))
593 return -ENODEV;
594 netdev_lock_ops(dev);
595 err = dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
596 netdev_unlock_ops(dev);
597 return err;
598
599 case SIOCDELMULTI:
600 if (!ops->ndo_set_rx_mode ||
601 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
602 return -EINVAL;
603 if (!netif_device_present(dev))
604 return -ENODEV;
605 netdev_lock_ops(dev);
606 err = dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
607 netdev_unlock_ops(dev);
608 return err;
609
610 case SIOCSIFTXQLEN:
611 if (ifr->ifr_qlen < 0)
612 return -EINVAL;
613 return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
614
615 case SIOCSIFNAME:
616 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
617 return dev_change_name(dev, ifr->ifr_newname);
618
619 case SIOCWANDEV:
620 return dev_siocwandev(dev, &ifr->ifr_settings);
621
622 case SIOCDEVPRIVATE ... SIOCDEVPRIVATE + 15:
623 return dev_siocdevprivate(dev, ifr, data, cmd);
624
625 case SIOCSHWTSTAMP:
626 return dev_set_hwtstamp(dev, ifr);
627
628 case SIOCGHWTSTAMP:
629 return dev_get_hwtstamp(dev, ifr);
630
631 case SIOCGMIIPHY:
632 case SIOCGMIIREG:
633 case SIOCSMIIREG:
634 return dev_eth_ioctl(dev, ifr, cmd);
635
636 case SIOCBONDENSLAVE:
637 case SIOCBONDRELEASE:
638 case SIOCBONDSETHWADDR:
639 case SIOCBONDSLAVEINFOQUERY:
640 case SIOCBONDINFOQUERY:
641 case SIOCBONDCHANGEACTIVE:
642 return dev_siocbond(dev, ifr, cmd);
643
644 /* Unknown ioctl */
645 default:
646 err = -EINVAL;
647 }
648 return err;
649 }
650
651 /**
652 * dev_load - load a network module
653 * @net: the applicable net namespace
654 * @name: name of interface
655 *
656 * If a network interface is not present and the process has suitable
657 * privileges this function loads the module. If module loading is not
658 * available in this kernel then it becomes a nop.
659 */
660
dev_load(struct net * net,const char * name)661 void dev_load(struct net *net, const char *name)
662 {
663 struct net_device *dev;
664 int no_module;
665
666 rcu_read_lock();
667 dev = dev_get_by_name_rcu(net, name);
668 rcu_read_unlock();
669
670 no_module = !dev;
671 if (no_module && capable(CAP_NET_ADMIN))
672 no_module = request_module("netdev-%s", name);
673 if (no_module && capable(CAP_SYS_MODULE))
674 request_module("%s", name);
675 }
676 EXPORT_SYMBOL(dev_load);
677
678 /*
679 * This function handles all "interface"-type I/O control requests. The actual
680 * 'doing' part of this is dev_ifsioc above.
681 */
682
683 /**
684 * dev_ioctl - network device ioctl
685 * @net: the applicable net namespace
686 * @cmd: command to issue
687 * @ifr: pointer to a struct ifreq in user space
688 * @data: data exchanged with userspace
689 * @need_copyout: whether or not copy_to_user() should be called
690 *
691 * Issue ioctl functions to devices. This is normally called by the
692 * user space syscall interfaces but can sometimes be useful for
693 * other purposes. The return value is the return from the syscall if
694 * positive or a negative errno code on error.
695 */
696
dev_ioctl(struct net * net,unsigned int cmd,struct ifreq * ifr,void __user * data,bool * need_copyout)697 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
698 void __user *data, bool *need_copyout)
699 {
700 int ret;
701 char *colon;
702
703 if (need_copyout)
704 *need_copyout = true;
705 if (cmd == SIOCGIFNAME)
706 return dev_ifname(net, ifr);
707
708 ifr->ifr_name[IFNAMSIZ-1] = 0;
709
710 colon = strchr(ifr->ifr_name, ':');
711 if (colon)
712 *colon = 0;
713
714 /*
715 * See which interface the caller is talking about.
716 */
717
718 switch (cmd) {
719 case SIOCGIFHWADDR:
720 dev_load(net, ifr->ifr_name);
721 ret = netif_get_mac_address(&ifr->ifr_hwaddr, net,
722 ifr->ifr_name);
723 if (colon)
724 *colon = ':';
725 return ret;
726 /*
727 * These ioctl calls:
728 * - can be done by all.
729 * - atomic and do not require locking.
730 * - return a value
731 */
732 case SIOCGIFFLAGS:
733 case SIOCGIFMETRIC:
734 case SIOCGIFMTU:
735 case SIOCGIFSLAVE:
736 case SIOCGIFMAP:
737 case SIOCGIFINDEX:
738 case SIOCGIFTXQLEN:
739 dev_load(net, ifr->ifr_name);
740 rcu_read_lock();
741 ret = dev_ifsioc_locked(net, ifr, cmd);
742 rcu_read_unlock();
743 if (colon)
744 *colon = ':';
745 return ret;
746
747 case SIOCETHTOOL:
748 dev_load(net, ifr->ifr_name);
749 ret = dev_ethtool(net, ifr, data);
750 if (colon)
751 *colon = ':';
752 return ret;
753
754 /*
755 * These ioctl calls:
756 * - require superuser power.
757 * - require strict serialization.
758 * - return a value
759 */
760 case SIOCGMIIPHY:
761 case SIOCGMIIREG:
762 case SIOCSIFNAME:
763 dev_load(net, ifr->ifr_name);
764 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
765 return -EPERM;
766
767 rtnl_net_lock(net);
768 ret = dev_ifsioc(net, ifr, data, cmd);
769 rtnl_net_unlock(net);
770
771 if (colon)
772 *colon = ':';
773 return ret;
774
775 /*
776 * These ioctl calls:
777 * - require superuser power.
778 * - require strict serialization.
779 * - do not return a value
780 */
781 case SIOCSIFMAP:
782 case SIOCSIFTXQLEN:
783 if (!capable(CAP_NET_ADMIN))
784 return -EPERM;
785 fallthrough;
786 /*
787 * These ioctl calls:
788 * - require local superuser power.
789 * - require strict serialization.
790 * - do not return a value
791 */
792 case SIOCSIFFLAGS:
793 case SIOCSIFMETRIC:
794 case SIOCSIFMTU:
795 case SIOCSIFHWADDR:
796 case SIOCSIFSLAVE:
797 case SIOCADDMULTI:
798 case SIOCDELMULTI:
799 case SIOCSIFHWBROADCAST:
800 case SIOCSMIIREG:
801 case SIOCBONDENSLAVE:
802 case SIOCBONDRELEASE:
803 case SIOCBONDSETHWADDR:
804 case SIOCBONDCHANGEACTIVE:
805 case SIOCSHWTSTAMP:
806 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
807 return -EPERM;
808 fallthrough;
809 case SIOCBONDSLAVEINFOQUERY:
810 case SIOCBONDINFOQUERY:
811 dev_load(net, ifr->ifr_name);
812
813 rtnl_net_lock(net);
814 ret = dev_ifsioc(net, ifr, data, cmd);
815 rtnl_net_unlock(net);
816
817 if (need_copyout)
818 *need_copyout = false;
819 return ret;
820
821 case SIOCGIFMEM:
822 /* Get the per device memory space. We can add this but
823 * currently do not support it */
824 case SIOCSIFMEM:
825 /* Set the per device memory buffer space.
826 * Not applicable in our case */
827 case SIOCSIFLINK:
828 return -ENOTTY;
829
830 /*
831 * Unknown or private ioctl.
832 */
833 default:
834 if (cmd == SIOCWANDEV ||
835 cmd == SIOCGHWTSTAMP ||
836 (cmd >= SIOCDEVPRIVATE &&
837 cmd <= SIOCDEVPRIVATE + 15)) {
838 dev_load(net, ifr->ifr_name);
839
840 rtnl_net_lock(net);
841 ret = dev_ifsioc(net, ifr, data, cmd);
842 rtnl_net_unlock(net);
843 return ret;
844 }
845 return -ENOTTY;
846 }
847 }
848