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 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 if (!dev->netdev_ops->ndo_hwtstamp_get)
280 return -EOPNOTSUPP;
281
282 return dev->netdev_ops->ndo_hwtstamp_get(dev, cfg);
283 }
284
dev_get_hwtstamp(struct net_device * dev,struct ifreq * ifr)285 static int dev_get_hwtstamp(struct net_device *dev, struct ifreq *ifr)
286 {
287 struct kernel_hwtstamp_config kernel_cfg = {};
288 struct hwtstamp_config cfg;
289 int err;
290
291 if (!netif_device_present(dev))
292 return -ENODEV;
293
294 kernel_cfg.ifr = ifr;
295 netdev_lock_ops(dev);
296 err = dev_get_hwtstamp_phylib(dev, &kernel_cfg);
297 netdev_unlock_ops(dev);
298 if (err)
299 return err;
300
301 /* If the request was resolved through an unconverted driver, omit
302 * the copy_to_user(), since the implementation has already done that
303 */
304 if (!kernel_cfg.copied_to_user) {
305 hwtstamp_config_from_kernel(&cfg, &kernel_cfg);
306
307 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
308 return -EFAULT;
309 }
310
311 return 0;
312 }
313
314 /**
315 * dev_set_hwtstamp_phylib() - Change hardware timestamping of NIC
316 * or of attached phylib PHY
317 * @dev: Network device
318 * @cfg: Timestamping configuration structure
319 * @extack: Netlink extended ack message structure, for error reporting
320 *
321 * Helper for enforcing a common policy that phylib timestamping, if available,
322 * should take precedence in front of hardware timestamping provided by the
323 * netdev. If the netdev driver needs to perform specific actions even for PHY
324 * timestamping to work properly (a switch port must trap the timestamped
325 * frames and not forward them), it must set dev->see_all_hwtstamp_requests.
326 */
dev_set_hwtstamp_phylib(struct net_device * dev,struct kernel_hwtstamp_config * cfg,struct netlink_ext_ack * extack)327 int dev_set_hwtstamp_phylib(struct net_device *dev,
328 struct kernel_hwtstamp_config *cfg,
329 struct netlink_ext_ack *extack)
330 {
331 const struct net_device_ops *ops = dev->netdev_ops;
332 struct kernel_hwtstamp_config old_cfg = {};
333 struct hwtstamp_provider *hwprov;
334 struct phy_device *phydev;
335 bool changed = false;
336 bool phy_ts;
337 int err;
338
339 hwprov = netdev_ops_lock_dereference(dev->hwprov, dev);
340 if (hwprov) {
341 if (hwprov->source == HWTSTAMP_SOURCE_PHYLIB &&
342 hwprov->phydev) {
343 phy_ts = true;
344 phydev = hwprov->phydev;
345 } else if (hwprov->source == HWTSTAMP_SOURCE_NETDEV) {
346 phy_ts = false;
347 } else {
348 return -EOPNOTSUPP;
349 }
350
351 cfg->qualifier = hwprov->desc.qualifier;
352 } else {
353 phy_ts = phy_is_default_hwtstamp(dev->phydev);
354 if (phy_ts)
355 phydev = dev->phydev;
356 }
357
358 cfg->source = phy_ts ? HWTSTAMP_SOURCE_PHYLIB : HWTSTAMP_SOURCE_NETDEV;
359
360 if (phy_ts && dev->see_all_hwtstamp_requests) {
361 if (!ops->ndo_hwtstamp_get)
362 return -EOPNOTSUPP;
363
364 err = ops->ndo_hwtstamp_get(dev, &old_cfg);
365 if (err)
366 return err;
367 }
368
369 if (!phy_ts || dev->see_all_hwtstamp_requests) {
370 if (!ops->ndo_hwtstamp_set)
371 return -EOPNOTSUPP;
372
373 err = ops->ndo_hwtstamp_set(dev, cfg, extack);
374 if (err) {
375 if (extack->_msg)
376 netdev_err(dev, "%s\n", extack->_msg);
377 return err;
378 }
379 }
380
381 if (phy_ts && dev->see_all_hwtstamp_requests)
382 changed = kernel_hwtstamp_config_changed(&old_cfg, cfg);
383
384 if (phy_ts) {
385 err = phy_hwtstamp_set(phydev, cfg, extack);
386 if (err) {
387 if (changed)
388 ops->ndo_hwtstamp_set(dev, &old_cfg, NULL);
389 return err;
390 }
391 }
392
393 return 0;
394 }
395
dev_set_hwtstamp(struct net_device * dev,struct ifreq * ifr)396 static int dev_set_hwtstamp(struct net_device *dev, struct ifreq *ifr)
397 {
398 struct kernel_hwtstamp_config kernel_cfg = {};
399 struct netlink_ext_ack extack = {};
400 struct hwtstamp_config cfg;
401 int err;
402
403 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
404 return -EFAULT;
405
406 hwtstamp_config_to_kernel(&kernel_cfg, &cfg);
407 kernel_cfg.ifr = ifr;
408
409 err = net_hwtstamp_validate(&kernel_cfg);
410 if (err)
411 return err;
412
413 err = dsa_conduit_hwtstamp_validate(dev, &kernel_cfg, &extack);
414 if (err) {
415 if (extack._msg)
416 netdev_err(dev, "%s\n", extack._msg);
417 return err;
418 }
419
420 if (!netif_device_present(dev))
421 return -ENODEV;
422
423 netdev_lock_ops(dev);
424 err = dev_set_hwtstamp_phylib(dev, &kernel_cfg, &extack);
425 netdev_unlock_ops(dev);
426 if (err)
427 return err;
428
429 /* The driver may have modified the configuration, so copy the
430 * updated version of it back to user space
431 */
432 if (!kernel_cfg.copied_to_user) {
433 hwtstamp_config_from_kernel(&cfg, &kernel_cfg);
434
435 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
436 return -EFAULT;
437 }
438
439 return 0;
440 }
441
generic_hwtstamp_get_lower(struct net_device * dev,struct kernel_hwtstamp_config * kernel_cfg)442 int generic_hwtstamp_get_lower(struct net_device *dev,
443 struct kernel_hwtstamp_config *kernel_cfg)
444 {
445 int err;
446
447 if (!netif_device_present(dev))
448 return -ENODEV;
449
450 netdev_lock_ops(dev);
451 err = dev_get_hwtstamp_phylib(dev, kernel_cfg);
452 netdev_unlock_ops(dev);
453
454 return err;
455 }
456 EXPORT_SYMBOL(generic_hwtstamp_get_lower);
457
generic_hwtstamp_set_lower(struct net_device * dev,struct kernel_hwtstamp_config * kernel_cfg,struct netlink_ext_ack * extack)458 int generic_hwtstamp_set_lower(struct net_device *dev,
459 struct kernel_hwtstamp_config *kernel_cfg,
460 struct netlink_ext_ack *extack)
461 {
462 int err;
463
464 if (!netif_device_present(dev))
465 return -ENODEV;
466
467 netdev_lock_ops(dev);
468 err = dev_set_hwtstamp_phylib(dev, kernel_cfg, extack);
469 netdev_unlock_ops(dev);
470
471 return err;
472 }
473 EXPORT_SYMBOL(generic_hwtstamp_set_lower);
474
dev_siocbond(struct net_device * dev,struct ifreq * ifr,unsigned int cmd)475 static int dev_siocbond(struct net_device *dev,
476 struct ifreq *ifr, unsigned int cmd)
477 {
478 const struct net_device_ops *ops = dev->netdev_ops;
479
480 if (ops->ndo_siocbond) {
481 int ret = -ENODEV;
482
483 netdev_lock_ops(dev);
484 if (netif_device_present(dev))
485 ret = ops->ndo_siocbond(dev, ifr, cmd);
486 netdev_unlock_ops(dev);
487
488 return ret;
489 }
490
491 return -EOPNOTSUPP;
492 }
493
dev_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,unsigned int cmd)494 static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
495 void __user *data, unsigned int cmd)
496 {
497 const struct net_device_ops *ops = dev->netdev_ops;
498
499 if (ops->ndo_siocdevprivate) {
500 int ret = -ENODEV;
501
502 netdev_lock_ops(dev);
503 if (netif_device_present(dev))
504 ret = ops->ndo_siocdevprivate(dev, ifr, data, cmd);
505 netdev_unlock_ops(dev);
506
507 return ret;
508 }
509
510 return -EOPNOTSUPP;
511 }
512
dev_siocwandev(struct net_device * dev,struct if_settings * ifs)513 static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs)
514 {
515 const struct net_device_ops *ops = dev->netdev_ops;
516
517 if (ops->ndo_siocwandev) {
518 int ret = -ENODEV;
519
520 netdev_lock_ops(dev);
521 if (netif_device_present(dev))
522 ret = ops->ndo_siocwandev(dev, ifs);
523 netdev_unlock_ops(dev);
524
525 return ret;
526 }
527
528 return -EOPNOTSUPP;
529 }
530
531 /*
532 * Perform the SIOCxIFxxx calls, inside rtnl_net_lock()
533 */
dev_ifsioc(struct net * net,struct ifreq * ifr,void __user * data,unsigned int cmd)534 static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
535 unsigned int cmd)
536 {
537 int err;
538 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
539 const struct net_device_ops *ops;
540
541 if (!dev)
542 return -ENODEV;
543
544 ops = dev->netdev_ops;
545
546 switch (cmd) {
547 case SIOCSIFFLAGS: /* Set interface flags */
548 return dev_change_flags(dev, ifr->ifr_flags, NULL);
549
550 case SIOCSIFMETRIC: /* Set the metric on the interface
551 (currently unused) */
552 return -EOPNOTSUPP;
553
554 case SIOCSIFMTU: /* Set the MTU of a device */
555 return dev_set_mtu(dev, ifr->ifr_mtu);
556
557 case SIOCSIFHWADDR:
558 if (dev->addr_len > sizeof(ifr->ifr_hwaddr))
559 return -EINVAL;
560 return dev_set_mac_address_user(dev,
561 (struct sockaddr_storage *)&ifr->ifr_hwaddr,
562 NULL);
563
564 case SIOCSIFHWBROADCAST:
565 if (ifr->ifr_hwaddr.sa_family != dev->type)
566 return -EINVAL;
567 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
568 min(sizeof(ifr->ifr_hwaddr.sa_data),
569 (size_t)dev->addr_len));
570 netdev_lock_ops(dev);
571 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
572 netdev_unlock_ops(dev);
573 return 0;
574
575 case SIOCSIFMAP:
576 netdev_lock_ops(dev);
577 err = netif_setifmap(dev, ifr);
578 netdev_unlock_ops(dev);
579 return err;
580
581 case SIOCADDMULTI:
582 if ((!ops->ndo_set_rx_mode && !ops->ndo_set_rx_mode_async) ||
583 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
584 return -EINVAL;
585 if (!netif_device_present(dev))
586 return -ENODEV;
587 netdev_lock_ops(dev);
588 err = dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
589 netif_rx_mode_sync(dev);
590 netdev_unlock_ops(dev);
591 return err;
592
593 case SIOCDELMULTI:
594 if ((!ops->ndo_set_rx_mode && !ops->ndo_set_rx_mode_async) ||
595 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
596 return -EINVAL;
597 if (!netif_device_present(dev))
598 return -ENODEV;
599 netdev_lock_ops(dev);
600 err = dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
601 netif_rx_mode_sync(dev);
602 netdev_unlock_ops(dev);
603 return err;
604
605 case SIOCSIFTXQLEN:
606 if (ifr->ifr_qlen < 0)
607 return -EINVAL;
608 return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
609
610 case SIOCSIFNAME:
611 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
612 return dev_change_name(dev, ifr->ifr_newname);
613
614 case SIOCWANDEV:
615 return dev_siocwandev(dev, &ifr->ifr_settings);
616
617 case SIOCDEVPRIVATE ... SIOCDEVPRIVATE + 15:
618 return dev_siocdevprivate(dev, ifr, data, cmd);
619
620 case SIOCSHWTSTAMP:
621 return dev_set_hwtstamp(dev, ifr);
622
623 case SIOCGHWTSTAMP:
624 return dev_get_hwtstamp(dev, ifr);
625
626 case SIOCGMIIPHY:
627 case SIOCGMIIREG:
628 case SIOCSMIIREG:
629 return dev_eth_ioctl(dev, ifr, cmd);
630
631 case SIOCBONDENSLAVE:
632 case SIOCBONDRELEASE:
633 case SIOCBONDSETHWADDR:
634 case SIOCBONDSLAVEINFOQUERY:
635 case SIOCBONDINFOQUERY:
636 case SIOCBONDCHANGEACTIVE:
637 return dev_siocbond(dev, ifr, cmd);
638
639 /* Unknown ioctl */
640 default:
641 err = -EINVAL;
642 }
643 return err;
644 }
645
646 /**
647 * dev_load - load a network module
648 * @net: the applicable net namespace
649 * @name: name of interface
650 *
651 * If a network interface is not present and the process has suitable
652 * privileges this function loads the module. If module loading is not
653 * available in this kernel then it becomes a nop.
654 */
655
dev_load(struct net * net,const char * name)656 void dev_load(struct net *net, const char *name)
657 {
658 struct net_device *dev;
659 int no_module;
660
661 rcu_read_lock();
662 dev = dev_get_by_name_rcu(net, name);
663 rcu_read_unlock();
664
665 no_module = !dev;
666 if (no_module && capable(CAP_NET_ADMIN))
667 no_module = request_module("netdev-%s", name);
668 if (no_module && capable(CAP_SYS_MODULE))
669 request_module("%s", name);
670 }
671 EXPORT_SYMBOL(dev_load);
672
673 /*
674 * This function handles all "interface"-type I/O control requests. The actual
675 * 'doing' part of this is dev_ifsioc above.
676 */
677
678 /**
679 * dev_ioctl - network device ioctl
680 * @net: the applicable net namespace
681 * @cmd: command to issue
682 * @ifr: pointer to a struct ifreq in user space
683 * @data: data exchanged with userspace
684 * @need_copyout: whether or not copy_to_user() should be called
685 *
686 * Issue ioctl functions to devices. This is normally called by the
687 * user space syscall interfaces but can sometimes be useful for
688 * other purposes. The return value is the return from the syscall if
689 * positive or a negative errno code on error.
690 */
691
dev_ioctl(struct net * net,unsigned int cmd,struct ifreq * ifr,void __user * data,bool * need_copyout)692 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
693 void __user *data, bool *need_copyout)
694 {
695 int ret;
696 char *colon;
697
698 if (need_copyout)
699 *need_copyout = true;
700 if (cmd == SIOCGIFNAME)
701 return dev_ifname(net, ifr);
702
703 ifr->ifr_name[IFNAMSIZ-1] = 0;
704
705 colon = strchr(ifr->ifr_name, ':');
706 if (colon)
707 *colon = 0;
708
709 /*
710 * See which interface the caller is talking about.
711 */
712
713 switch (cmd) {
714 case SIOCGIFHWADDR:
715 dev_load(net, ifr->ifr_name);
716 ret = netif_get_mac_address(&ifr->ifr_hwaddr, net,
717 ifr->ifr_name);
718 if (colon)
719 *colon = ':';
720 return ret;
721 /*
722 * These ioctl calls:
723 * - can be done by all.
724 * - atomic and do not require locking.
725 * - return a value
726 */
727 case SIOCGIFFLAGS:
728 case SIOCGIFMETRIC:
729 case SIOCGIFMTU:
730 case SIOCGIFSLAVE:
731 case SIOCGIFMAP:
732 case SIOCGIFINDEX:
733 case SIOCGIFTXQLEN:
734 dev_load(net, ifr->ifr_name);
735 rcu_read_lock();
736 ret = dev_ifsioc_locked(net, ifr, cmd);
737 rcu_read_unlock();
738 if (colon)
739 *colon = ':';
740 return ret;
741
742 case SIOCETHTOOL:
743 dev_load(net, ifr->ifr_name);
744 ret = dev_ethtool(net, ifr, data);
745 if (colon)
746 *colon = ':';
747 return ret;
748
749 /*
750 * These ioctl calls:
751 * - require superuser power.
752 * - require strict serialization.
753 * - return a value
754 */
755 case SIOCGMIIPHY:
756 case SIOCGMIIREG:
757 case SIOCSIFNAME:
758 dev_load(net, ifr->ifr_name);
759 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
760 return -EPERM;
761
762 rtnl_net_lock(net);
763 ret = dev_ifsioc(net, ifr, data, cmd);
764 rtnl_net_unlock(net);
765
766 if (colon)
767 *colon = ':';
768 return ret;
769
770 /*
771 * These ioctl calls:
772 * - require superuser power.
773 * - require strict serialization.
774 * - do not return a value
775 */
776 case SIOCSIFMAP:
777 case SIOCSIFTXQLEN:
778 if (!capable(CAP_NET_ADMIN))
779 return -EPERM;
780 fallthrough;
781 /*
782 * These ioctl calls:
783 * - require local superuser power.
784 * - require strict serialization.
785 * - do not return a value
786 */
787 case SIOCSIFFLAGS:
788 case SIOCSIFMETRIC:
789 case SIOCSIFMTU:
790 case SIOCSIFHWADDR:
791 case SIOCSIFSLAVE:
792 case SIOCADDMULTI:
793 case SIOCDELMULTI:
794 case SIOCSIFHWBROADCAST:
795 case SIOCSMIIREG:
796 case SIOCBONDENSLAVE:
797 case SIOCBONDRELEASE:
798 case SIOCBONDSETHWADDR:
799 case SIOCBONDCHANGEACTIVE:
800 case SIOCSHWTSTAMP:
801 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
802 return -EPERM;
803 fallthrough;
804 case SIOCBONDSLAVEINFOQUERY:
805 case SIOCBONDINFOQUERY:
806 dev_load(net, ifr->ifr_name);
807
808 rtnl_net_lock(net);
809 ret = dev_ifsioc(net, ifr, data, cmd);
810 rtnl_net_unlock(net);
811
812 if (need_copyout)
813 *need_copyout = false;
814 return ret;
815
816 case SIOCGIFMEM:
817 /* Get the per device memory space. We can add this but
818 * currently do not support it */
819 case SIOCSIFMEM:
820 /* Set the per device memory buffer space.
821 * Not applicable in our case */
822 case SIOCSIFLINK:
823 return -ENOTTY;
824
825 /*
826 * Unknown or private ioctl.
827 */
828 default:
829 if (cmd == SIOCWANDEV ||
830 cmd == SIOCGHWTSTAMP ||
831 (cmd >= SIOCDEVPRIVATE &&
832 cmd <= SIOCDEVPRIVATE + 15)) {
833 dev_load(net, ifr->ifr_name);
834
835 rtnl_net_lock(net);
836 ret = dev_ifsioc(net, ifr, data, cmd);
837 rtnl_net_unlock(net);
838 return ret;
839 }
840 return -ENOTTY;
841 }
842 }
843