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 = netdev_ops_lock_dereference(dev->hwprov, dev);
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 dev->netdev_ops->ndo_hwtstamp_get)
272 return dev->netdev_ops->ndo_hwtstamp_get(dev, cfg);
273
274 return -EOPNOTSUPP;
275 }
276
277 if (phy_is_default_hwtstamp(dev->phydev))
278 return phy_hwtstamp_get(dev->phydev, cfg);
279
280 if (!dev->netdev_ops->ndo_hwtstamp_get)
281 return -EOPNOTSUPP;
282
283 return dev->netdev_ops->ndo_hwtstamp_get(dev, cfg);
284 }
285
dev_get_hwtstamp(struct net_device * dev,struct ifreq * ifr)286 static int dev_get_hwtstamp(struct net_device *dev, struct ifreq *ifr)
287 {
288 struct kernel_hwtstamp_config kernel_cfg = {};
289 struct hwtstamp_config cfg;
290 int err;
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 = netdev_ops_lock_dereference(dev->hwprov, dev);
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 if (!ops->ndo_hwtstamp_get)
363 return -EOPNOTSUPP;
364
365 err = ops->ndo_hwtstamp_get(dev, &old_cfg);
366 if (err)
367 return err;
368 }
369
370 if (!phy_ts || dev->see_all_hwtstamp_requests) {
371 if (!ops->ndo_hwtstamp_set)
372 return -EOPNOTSUPP;
373
374 err = ops->ndo_hwtstamp_set(dev, cfg, extack);
375 if (err) {
376 if (extack->_msg)
377 netdev_err(dev, "%s\n", extack->_msg);
378 return err;
379 }
380 }
381
382 if (phy_ts && dev->see_all_hwtstamp_requests)
383 changed = kernel_hwtstamp_config_changed(&old_cfg, cfg);
384
385 if (phy_ts) {
386 err = phy_hwtstamp_set(phydev, cfg, extack);
387 if (err) {
388 if (changed)
389 ops->ndo_hwtstamp_set(dev, &old_cfg, NULL);
390 return err;
391 }
392 }
393
394 return 0;
395 }
396
dev_set_hwtstamp(struct net_device * dev,struct ifreq * ifr)397 static int dev_set_hwtstamp(struct net_device *dev, struct ifreq *ifr)
398 {
399 struct kernel_hwtstamp_config kernel_cfg = {};
400 struct netlink_ext_ack extack = {};
401 struct hwtstamp_config cfg;
402 int err;
403
404 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
405 return -EFAULT;
406
407 hwtstamp_config_to_kernel(&kernel_cfg, &cfg);
408 kernel_cfg.ifr = ifr;
409
410 err = net_hwtstamp_validate(&kernel_cfg);
411 if (err)
412 return err;
413
414 err = dsa_conduit_hwtstamp_validate(dev, &kernel_cfg, &extack);
415 if (err) {
416 if (extack._msg)
417 netdev_err(dev, "%s\n", extack._msg);
418 return err;
419 }
420
421 if (!netif_device_present(dev))
422 return -ENODEV;
423
424 netdev_lock_ops(dev);
425 err = dev_set_hwtstamp_phylib(dev, &kernel_cfg, &extack);
426 netdev_unlock_ops(dev);
427 if (err)
428 return err;
429
430 /* The driver may have modified the configuration, so copy the
431 * updated version of it back to user space
432 */
433 if (!kernel_cfg.copied_to_user) {
434 hwtstamp_config_from_kernel(&cfg, &kernel_cfg);
435
436 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
437 return -EFAULT;
438 }
439
440 return 0;
441 }
442
generic_hwtstamp_get_lower(struct net_device * dev,struct kernel_hwtstamp_config * kernel_cfg)443 int generic_hwtstamp_get_lower(struct net_device *dev,
444 struct kernel_hwtstamp_config *kernel_cfg)
445 {
446 int err;
447
448 if (!netif_device_present(dev))
449 return -ENODEV;
450
451 netdev_lock_ops(dev);
452 err = dev_get_hwtstamp_phylib(dev, kernel_cfg);
453 netdev_unlock_ops(dev);
454
455 return err;
456 }
457 EXPORT_SYMBOL(generic_hwtstamp_get_lower);
458
generic_hwtstamp_set_lower(struct net_device * dev,struct kernel_hwtstamp_config * kernel_cfg,struct netlink_ext_ack * extack)459 int generic_hwtstamp_set_lower(struct net_device *dev,
460 struct kernel_hwtstamp_config *kernel_cfg,
461 struct netlink_ext_ack *extack)
462 {
463 int err;
464
465 if (!netif_device_present(dev))
466 return -ENODEV;
467
468 netdev_lock_ops(dev);
469 err = dev_set_hwtstamp_phylib(dev, kernel_cfg, extack);
470 netdev_unlock_ops(dev);
471
472 return err;
473 }
474 EXPORT_SYMBOL(generic_hwtstamp_set_lower);
475
dev_siocbond(struct net_device * dev,struct ifreq * ifr,unsigned int cmd)476 static int dev_siocbond(struct net_device *dev,
477 struct ifreq *ifr, unsigned int cmd)
478 {
479 const struct net_device_ops *ops = dev->netdev_ops;
480
481 if (ops->ndo_siocbond) {
482 int ret = -ENODEV;
483
484 netdev_lock_ops(dev);
485 if (netif_device_present(dev))
486 ret = ops->ndo_siocbond(dev, ifr, cmd);
487 netdev_unlock_ops(dev);
488
489 return ret;
490 }
491
492 return -EOPNOTSUPP;
493 }
494
dev_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,unsigned int cmd)495 static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
496 void __user *data, unsigned int cmd)
497 {
498 const struct net_device_ops *ops = dev->netdev_ops;
499
500 if (ops->ndo_siocdevprivate) {
501 int ret = -ENODEV;
502
503 netdev_lock_ops(dev);
504 if (netif_device_present(dev))
505 ret = ops->ndo_siocdevprivate(dev, ifr, data, cmd);
506 netdev_unlock_ops(dev);
507
508 return ret;
509 }
510
511 return -EOPNOTSUPP;
512 }
513
dev_siocwandev(struct net_device * dev,struct if_settings * ifs)514 static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs)
515 {
516 const struct net_device_ops *ops = dev->netdev_ops;
517
518 if (ops->ndo_siocwandev) {
519 int ret = -ENODEV;
520
521 netdev_lock_ops(dev);
522 if (netif_device_present(dev))
523 ret = ops->ndo_siocwandev(dev, ifs);
524 netdev_unlock_ops(dev);
525
526 return ret;
527 }
528
529 return -EOPNOTSUPP;
530 }
531
532 /*
533 * Perform the SIOCxIFxxx calls, inside rtnl_net_lock()
534 */
dev_ifsioc(struct net * net,struct ifreq * ifr,void __user * data,unsigned int cmd)535 static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
536 unsigned int cmd)
537 {
538 int err;
539 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
540 const struct net_device_ops *ops;
541
542 if (!dev)
543 return -ENODEV;
544
545 ops = dev->netdev_ops;
546
547 switch (cmd) {
548 case SIOCSIFFLAGS: /* Set interface flags */
549 return dev_change_flags(dev, ifr->ifr_flags, NULL);
550
551 case SIOCSIFMETRIC: /* Set the metric on the interface
552 (currently unused) */
553 return -EOPNOTSUPP;
554
555 case SIOCSIFMTU: /* Set the MTU of a device */
556 return dev_set_mtu(dev, ifr->ifr_mtu);
557
558 case SIOCSIFHWADDR:
559 if (dev->addr_len > sizeof(ifr->ifr_hwaddr))
560 return -EINVAL;
561 return dev_set_mac_address_user(dev,
562 (struct sockaddr_storage *)&ifr->ifr_hwaddr,
563 NULL);
564
565 case SIOCSIFHWBROADCAST:
566 if (ifr->ifr_hwaddr.sa_family != dev->type)
567 return -EINVAL;
568 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
569 min(sizeof(ifr->ifr_hwaddr.sa_data),
570 (size_t)dev->addr_len));
571 netdev_lock_ops(dev);
572 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
573 netdev_unlock_ops(dev);
574 return 0;
575
576 case SIOCSIFMAP:
577 netdev_lock_ops(dev);
578 err = netif_setifmap(dev, ifr);
579 netdev_unlock_ops(dev);
580 return err;
581
582 case SIOCADDMULTI:
583 if ((!ops->ndo_set_rx_mode && !ops->ndo_set_rx_mode_async) ||
584 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
585 return -EINVAL;
586 if (!netif_device_present(dev))
587 return -ENODEV;
588 netdev_lock_ops(dev);
589 err = dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
590 netif_rx_mode_sync(dev);
591 netdev_unlock_ops(dev);
592 return err;
593
594 case SIOCDELMULTI:
595 if ((!ops->ndo_set_rx_mode && !ops->ndo_set_rx_mode_async) ||
596 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
597 return -EINVAL;
598 if (!netif_device_present(dev))
599 return -ENODEV;
600 netdev_lock_ops(dev);
601 err = dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
602 netif_rx_mode_sync(dev);
603 netdev_unlock_ops(dev);
604 return err;
605
606 case SIOCSIFTXQLEN:
607 if (ifr->ifr_qlen < 0)
608 return -EINVAL;
609 return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
610
611 case SIOCSIFNAME:
612 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
613 return dev_change_name(dev, ifr->ifr_newname);
614
615 case SIOCWANDEV:
616 return dev_siocwandev(dev, &ifr->ifr_settings);
617
618 case SIOCDEVPRIVATE ... SIOCDEVPRIVATE + 15:
619 return dev_siocdevprivate(dev, ifr, data, cmd);
620
621 case SIOCSHWTSTAMP:
622 return dev_set_hwtstamp(dev, ifr);
623
624 case SIOCGHWTSTAMP:
625 return dev_get_hwtstamp(dev, ifr);
626
627 case SIOCGMIIPHY:
628 case SIOCGMIIREG:
629 case SIOCSMIIREG:
630 return dev_eth_ioctl(dev, ifr, cmd);
631
632 case SIOCBONDENSLAVE:
633 case SIOCBONDRELEASE:
634 case SIOCBONDSETHWADDR:
635 case SIOCBONDSLAVEINFOQUERY:
636 case SIOCBONDINFOQUERY:
637 case SIOCBONDCHANGEACTIVE:
638 return dev_siocbond(dev, ifr, cmd);
639
640 /* Unknown ioctl */
641 default:
642 err = -EINVAL;
643 }
644 return err;
645 }
646
647 /**
648 * dev_load - load a network module
649 * @net: the applicable net namespace
650 * @name: name of interface
651 *
652 * If a network interface is not present and the process has suitable
653 * privileges this function loads the module. If module loading is not
654 * available in this kernel then it becomes a nop.
655 */
656
dev_load(struct net * net,const char * name)657 void dev_load(struct net *net, const char *name)
658 {
659 struct net_device *dev;
660 int no_module;
661
662 rcu_read_lock();
663 dev = dev_get_by_name_rcu(net, name);
664 rcu_read_unlock();
665
666 no_module = !dev;
667 if (no_module && capable(CAP_NET_ADMIN))
668 no_module = request_module("netdev-%s", name);
669 if (no_module && capable(CAP_SYS_MODULE))
670 request_module("%s", name);
671 }
672 EXPORT_SYMBOL(dev_load);
673
674 /*
675 * This function handles all "interface"-type I/O control requests. The actual
676 * 'doing' part of this is dev_ifsioc above.
677 */
678
679 /**
680 * dev_ioctl - network device ioctl
681 * @net: the applicable net namespace
682 * @cmd: command to issue
683 * @ifr: pointer to a struct ifreq in user space
684 * @data: data exchanged with userspace
685 * @need_copyout: whether or not copy_to_user() should be called
686 *
687 * Issue ioctl functions to devices. This is normally called by the
688 * user space syscall interfaces but can sometimes be useful for
689 * other purposes. The return value is the return from the syscall if
690 * positive or a negative errno code on error.
691 */
692
dev_ioctl(struct net * net,unsigned int cmd,struct ifreq * ifr,void __user * data,bool * need_copyout)693 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
694 void __user *data, bool *need_copyout)
695 {
696 int ret;
697 char *colon;
698
699 if (need_copyout)
700 *need_copyout = true;
701 if (cmd == SIOCGIFNAME)
702 return dev_ifname(net, ifr);
703
704 ifr->ifr_name[IFNAMSIZ-1] = 0;
705
706 colon = strchr(ifr->ifr_name, ':');
707 if (colon)
708 *colon = 0;
709
710 /*
711 * See which interface the caller is talking about.
712 */
713
714 switch (cmd) {
715 case SIOCGIFHWADDR:
716 dev_load(net, ifr->ifr_name);
717 ret = netif_get_mac_address(&ifr->ifr_hwaddr, net,
718 ifr->ifr_name);
719 if (colon)
720 *colon = ':';
721 return ret;
722 /*
723 * These ioctl calls:
724 * - can be done by all.
725 * - atomic and do not require locking.
726 * - return a value
727 */
728 case SIOCGIFFLAGS:
729 case SIOCGIFMETRIC:
730 case SIOCGIFMTU:
731 case SIOCGIFSLAVE:
732 case SIOCGIFMAP:
733 case SIOCGIFINDEX:
734 case SIOCGIFTXQLEN:
735 dev_load(net, ifr->ifr_name);
736 rcu_read_lock();
737 ret = dev_ifsioc_locked(net, ifr, cmd);
738 rcu_read_unlock();
739 if (colon)
740 *colon = ':';
741 return ret;
742
743 case SIOCETHTOOL:
744 dev_load(net, ifr->ifr_name);
745 ret = dev_ethtool(net, ifr, data);
746 if (colon)
747 *colon = ':';
748 return ret;
749
750 /*
751 * These ioctl calls:
752 * - require superuser power.
753 * - require strict serialization.
754 * - return a value
755 */
756 case SIOCGMIIPHY:
757 case SIOCGMIIREG:
758 case SIOCSIFNAME:
759 dev_load(net, ifr->ifr_name);
760 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
761 return -EPERM;
762
763 rtnl_net_lock(net);
764 ret = dev_ifsioc(net, ifr, data, cmd);
765 rtnl_net_unlock(net);
766
767 if (colon)
768 *colon = ':';
769 return ret;
770
771 /*
772 * These ioctl calls:
773 * - require superuser power.
774 * - require strict serialization.
775 * - do not return a value
776 */
777 case SIOCSIFMAP:
778 case SIOCSIFTXQLEN:
779 if (!capable(CAP_NET_ADMIN))
780 return -EPERM;
781 fallthrough;
782 /*
783 * These ioctl calls:
784 * - require local superuser power.
785 * - require strict serialization.
786 * - do not return a value
787 */
788 case SIOCSIFFLAGS:
789 case SIOCSIFMETRIC:
790 case SIOCSIFMTU:
791 case SIOCSIFHWADDR:
792 case SIOCSIFSLAVE:
793 case SIOCADDMULTI:
794 case SIOCDELMULTI:
795 case SIOCSIFHWBROADCAST:
796 case SIOCSMIIREG:
797 case SIOCBONDENSLAVE:
798 case SIOCBONDRELEASE:
799 case SIOCBONDSETHWADDR:
800 case SIOCBONDCHANGEACTIVE:
801 case SIOCSHWTSTAMP:
802 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
803 return -EPERM;
804 fallthrough;
805 case SIOCBONDSLAVEINFOQUERY:
806 case SIOCBONDINFOQUERY:
807 dev_load(net, ifr->ifr_name);
808
809 rtnl_net_lock(net);
810 ret = dev_ifsioc(net, ifr, data, cmd);
811 rtnl_net_unlock(net);
812
813 if (need_copyout)
814 *need_copyout = false;
815 return ret;
816
817 case SIOCGIFMEM:
818 /* Get the per device memory space. We can add this but
819 * currently do not support it */
820 case SIOCSIFMEM:
821 /* Set the per device memory buffer space.
822 * Not applicable in our case */
823 case SIOCSIFLINK:
824 return -ENOTTY;
825
826 /*
827 * Unknown or private ioctl.
828 */
829 default:
830 if (cmd == SIOCWANDEV ||
831 cmd == SIOCGHWTSTAMP ||
832 (cmd >= SIOCDEVPRIVATE &&
833 cmd <= SIOCDEVPRIVATE + 15)) {
834 dev_load(net, ifr->ifr_name);
835
836 rtnl_net_lock(net);
837 ret = dev_ifsioc(net, ifr, data, cmd);
838 rtnl_net_unlock(net);
839 return ret;
840 }
841 return -ENOTTY;
842 }
843 }
844