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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
27static 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 */
38int 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
85static 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
112static 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 */
138static 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
187static 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
242static int dev_eth_ioctl(struct net_device *dev,
243 struct ifreq *ifr, unsigned int cmd)
244{
245 const struct net_device_ops *ops = dev->netdev_ops;
246
247 if (!ops->ndo_eth_ioctl)
248 return -EOPNOTSUPP;
249
250 if (!netif_device_present(dev))
251 return -ENODEV;
252
253 return ops->ndo_eth_ioctl(dev, ifr, cmd);
254}
255
256/**
257 * dev_get_hwtstamp_phylib() - Get hardware timestamping settings of NIC
258 * or of attached phylib PHY
259 * @dev: Network device
260 * @cfg: Timestamping configuration structure
261 *
262 * Helper for enforcing a common policy that phylib timestamping, if available,
263 * should take precedence in front of hardware timestamping provided by the
264 * netdev.
265 *
266 * Note: phy_mii_ioctl() only handles SIOCSHWTSTAMP (not SIOCGHWTSTAMP), and
267 * there only exists a phydev->mii_ts->hwtstamp() method. So this will return
268 * -EOPNOTSUPP for phylib for now, which is still more accurate than letting
269 * the netdev handle the GET request.
270 */
271static int dev_get_hwtstamp_phylib(struct net_device *dev,
272 struct kernel_hwtstamp_config *cfg)
273{
274 if (phy_has_hwtstamp(dev->phydev))
275 return phy_hwtstamp_get(dev->phydev, cfg);
276
277 return dev->netdev_ops->ndo_hwtstamp_get(dev, cfg);
278}
279
280static int dev_get_hwtstamp(struct net_device *dev, struct ifreq *ifr)
281{
282 const struct net_device_ops *ops = dev->netdev_ops;
283 struct kernel_hwtstamp_config kernel_cfg = {};
284 struct hwtstamp_config cfg;
285 int err;
286
287 if (!ops->ndo_hwtstamp_get)
288 return dev_eth_ioctl(dev, ifr, SIOCGHWTSTAMP); /* legacy */
289
290 if (!netif_device_present(dev))
291 return -ENODEV;
292
293 kernel_cfg.ifr = ifr;
294 err = dev_get_hwtstamp_phylib(dev, &kernel_cfg);
295 if (err)
296 return err;
297
298 /* If the request was resolved through an unconverted driver, omit
299 * the copy_to_user(), since the implementation has already done that
300 */
301 if (!kernel_cfg.copied_to_user) {
302 hwtstamp_config_from_kernel(&cfg, &kernel_cfg);
303
304 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
305 return -EFAULT;
306 }
307
308 return 0;
309}
310
311/**
312 * dev_set_hwtstamp_phylib() - Change hardware timestamping of NIC
313 * or of attached phylib PHY
314 * @dev: Network device
315 * @cfg: Timestamping configuration structure
316 * @extack: Netlink extended ack message structure, for error reporting
317 *
318 * Helper for enforcing a common policy that phylib timestamping, if available,
319 * should take precedence in front of hardware timestamping provided by the
320 * netdev. If the netdev driver needs to perform specific actions even for PHY
321 * timestamping to work properly (a switch port must trap the timestamped
322 * frames and not forward them), it must set IFF_SEE_ALL_HWTSTAMP_REQUESTS in
323 * dev->priv_flags.
324 */
325int dev_set_hwtstamp_phylib(struct net_device *dev,
326 struct kernel_hwtstamp_config *cfg,
327 struct netlink_ext_ack *extack)
328{
329 const struct net_device_ops *ops = dev->netdev_ops;
330 bool phy_ts = phy_has_hwtstamp(dev->phydev);
331 struct kernel_hwtstamp_config old_cfg = {};
332 bool changed = false;
333 int err;
334
335 cfg->source = phy_ts ? HWTSTAMP_SOURCE_PHYLIB : HWTSTAMP_SOURCE_NETDEV;
336
337 if (phy_ts && (dev->priv_flags & IFF_SEE_ALL_HWTSTAMP_REQUESTS)) {
338 err = ops->ndo_hwtstamp_get(dev, &old_cfg);
339 if (err)
340 return err;
341 }
342
343 if (!phy_ts || (dev->priv_flags & IFF_SEE_ALL_HWTSTAMP_REQUESTS)) {
344 err = ops->ndo_hwtstamp_set(dev, cfg, extack);
345 if (err) {
346 if (extack->_msg)
347 netdev_err(dev, "%s\n", extack->_msg);
348 return err;
349 }
350 }
351
352 if (phy_ts && (dev->priv_flags & IFF_SEE_ALL_HWTSTAMP_REQUESTS))
353 changed = kernel_hwtstamp_config_changed(&old_cfg, cfg);
354
355 if (phy_ts) {
356 err = phy_hwtstamp_set(dev->phydev, cfg, extack);
357 if (err) {
358 if (changed)
359 ops->ndo_hwtstamp_set(dev, &old_cfg, NULL);
360 return err;
361 }
362 }
363
364 return 0;
365}
366EXPORT_SYMBOL_GPL(dev_set_hwtstamp_phylib);
367
368static int dev_set_hwtstamp(struct net_device *dev, struct ifreq *ifr)
369{
370 const struct net_device_ops *ops = dev->netdev_ops;
371 struct kernel_hwtstamp_config kernel_cfg = {};
372 struct netlink_ext_ack extack = {};
373 struct hwtstamp_config cfg;
374 int err;
375
376 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
377 return -EFAULT;
378
379 hwtstamp_config_to_kernel(&kernel_cfg, &cfg);
380 kernel_cfg.ifr = ifr;
381
382 err = net_hwtstamp_validate(&kernel_cfg);
383 if (err)
384 return err;
385
386 err = dsa_conduit_hwtstamp_validate(dev, &kernel_cfg, &extack);
387 if (err) {
388 if (extack._msg)
389 netdev_err(dev, "%s\n", extack._msg);
390 return err;
391 }
392
393 if (!ops->ndo_hwtstamp_set)
394 return dev_eth_ioctl(dev, ifr, SIOCSHWTSTAMP); /* legacy */
395
396 if (!netif_device_present(dev))
397 return -ENODEV;
398
399 err = dev_set_hwtstamp_phylib(dev, &kernel_cfg, &extack);
400 if (err)
401 return err;
402
403 /* The driver may have modified the configuration, so copy the
404 * updated version of it back to user space
405 */
406 if (!kernel_cfg.copied_to_user) {
407 hwtstamp_config_from_kernel(&cfg, &kernel_cfg);
408
409 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
410 return -EFAULT;
411 }
412
413 return 0;
414}
415
416static int generic_hwtstamp_ioctl_lower(struct net_device *dev, int cmd,
417 struct kernel_hwtstamp_config *kernel_cfg)
418{
419 struct ifreq ifrr;
420 int err;
421
422 strscpy_pad(ifrr.ifr_name, dev->name, IFNAMSIZ);
423 ifrr.ifr_ifru = kernel_cfg->ifr->ifr_ifru;
424
425 err = dev_eth_ioctl(dev, &ifrr, cmd);
426 if (err)
427 return err;
428
429 kernel_cfg->ifr->ifr_ifru = ifrr.ifr_ifru;
430 kernel_cfg->copied_to_user = true;
431
432 return 0;
433}
434
435int generic_hwtstamp_get_lower(struct net_device *dev,
436 struct kernel_hwtstamp_config *kernel_cfg)
437{
438 const struct net_device_ops *ops = dev->netdev_ops;
439
440 if (!netif_device_present(dev))
441 return -ENODEV;
442
443 if (ops->ndo_hwtstamp_get)
444 return dev_get_hwtstamp_phylib(dev, kernel_cfg);
445
446 /* Legacy path: unconverted lower driver */
447 return generic_hwtstamp_ioctl_lower(dev, SIOCGHWTSTAMP, kernel_cfg);
448}
449EXPORT_SYMBOL(generic_hwtstamp_get_lower);
450
451int generic_hwtstamp_set_lower(struct net_device *dev,
452 struct kernel_hwtstamp_config *kernel_cfg,
453 struct netlink_ext_ack *extack)
454{
455 const struct net_device_ops *ops = dev->netdev_ops;
456
457 if (!netif_device_present(dev))
458 return -ENODEV;
459
460 if (ops->ndo_hwtstamp_set)
461 return dev_set_hwtstamp_phylib(dev, kernel_cfg, extack);
462
463 /* Legacy path: unconverted lower driver */
464 return generic_hwtstamp_ioctl_lower(dev, SIOCSHWTSTAMP, kernel_cfg);
465}
466EXPORT_SYMBOL(generic_hwtstamp_set_lower);
467
468static int dev_siocbond(struct net_device *dev,
469 struct ifreq *ifr, unsigned int cmd)
470{
471 const struct net_device_ops *ops = dev->netdev_ops;
472
473 if (ops->ndo_siocbond) {
474 if (netif_device_present(dev))
475 return ops->ndo_siocbond(dev, ifr, cmd);
476 else
477 return -ENODEV;
478 }
479
480 return -EOPNOTSUPP;
481}
482
483static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
484 void __user *data, unsigned int cmd)
485{
486 const struct net_device_ops *ops = dev->netdev_ops;
487
488 if (ops->ndo_siocdevprivate) {
489 if (netif_device_present(dev))
490 return ops->ndo_siocdevprivate(dev, ifr, data, cmd);
491 else
492 return -ENODEV;
493 }
494
495 return -EOPNOTSUPP;
496}
497
498static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs)
499{
500 const struct net_device_ops *ops = dev->netdev_ops;
501
502 if (ops->ndo_siocwandev) {
503 if (netif_device_present(dev))
504 return ops->ndo_siocwandev(dev, ifs);
505 else
506 return -ENODEV;
507 }
508
509 return -EOPNOTSUPP;
510}
511
512/*
513 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
514 */
515static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
516 unsigned int cmd)
517{
518 int err;
519 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
520 const struct net_device_ops *ops;
521 netdevice_tracker dev_tracker;
522
523 if (!dev)
524 return -ENODEV;
525
526 ops = dev->netdev_ops;
527
528 switch (cmd) {
529 case SIOCSIFFLAGS: /* Set interface flags */
530 return dev_change_flags(dev, ifr->ifr_flags, NULL);
531
532 case SIOCSIFMETRIC: /* Set the metric on the interface
533 (currently unused) */
534 return -EOPNOTSUPP;
535
536 case SIOCSIFMTU: /* Set the MTU of a device */
537 return dev_set_mtu(dev, ifr->ifr_mtu);
538
539 case SIOCSIFHWADDR:
540 if (dev->addr_len > sizeof(struct sockaddr))
541 return -EINVAL;
542 return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL);
543
544 case SIOCSIFHWBROADCAST:
545 if (ifr->ifr_hwaddr.sa_family != dev->type)
546 return -EINVAL;
547 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
548 min(sizeof(ifr->ifr_hwaddr.sa_data_min),
549 (size_t)dev->addr_len));
550 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
551 return 0;
552
553 case SIOCSIFMAP:
554 return dev_setifmap(dev, ifr);
555
556 case SIOCADDMULTI:
557 if (!ops->ndo_set_rx_mode ||
558 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
559 return -EINVAL;
560 if (!netif_device_present(dev))
561 return -ENODEV;
562 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
563
564 case SIOCDELMULTI:
565 if (!ops->ndo_set_rx_mode ||
566 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
567 return -EINVAL;
568 if (!netif_device_present(dev))
569 return -ENODEV;
570 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
571
572 case SIOCSIFTXQLEN:
573 if (ifr->ifr_qlen < 0)
574 return -EINVAL;
575 return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
576
577 case SIOCSIFNAME:
578 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
579 return dev_change_name(dev, ifr->ifr_newname);
580
581 case SIOCWANDEV:
582 return dev_siocwandev(dev, &ifr->ifr_settings);
583
584 case SIOCBRADDIF:
585 case SIOCBRDELIF:
586 if (!netif_device_present(dev))
587 return -ENODEV;
588 if (!netif_is_bridge_master(dev))
589 return -EOPNOTSUPP;
590 netdev_hold(dev, &dev_tracker, GFP_KERNEL);
591 rtnl_unlock();
592 err = br_ioctl_call(net, netdev_priv(dev), cmd, ifr, NULL);
593 netdev_put(dev, &dev_tracker);
594 rtnl_lock();
595 return err;
596
597 case SIOCDEVPRIVATE ... SIOCDEVPRIVATE + 15:
598 return dev_siocdevprivate(dev, ifr, data, cmd);
599
600 case SIOCSHWTSTAMP:
601 return dev_set_hwtstamp(dev, ifr);
602
603 case SIOCGHWTSTAMP:
604 return dev_get_hwtstamp(dev, ifr);
605
606 case SIOCGMIIPHY:
607 case SIOCGMIIREG:
608 case SIOCSMIIREG:
609 return dev_eth_ioctl(dev, ifr, cmd);
610
611 case SIOCBONDENSLAVE:
612 case SIOCBONDRELEASE:
613 case SIOCBONDSETHWADDR:
614 case SIOCBONDSLAVEINFOQUERY:
615 case SIOCBONDINFOQUERY:
616 case SIOCBONDCHANGEACTIVE:
617 return dev_siocbond(dev, ifr, cmd);
618
619 /* Unknown ioctl */
620 default:
621 err = -EINVAL;
622 }
623 return err;
624}
625
626/**
627 * dev_load - load a network module
628 * @net: the applicable net namespace
629 * @name: name of interface
630 *
631 * If a network interface is not present and the process has suitable
632 * privileges this function loads the module. If module loading is not
633 * available in this kernel then it becomes a nop.
634 */
635
636void dev_load(struct net *net, const char *name)
637{
638 struct net_device *dev;
639 int no_module;
640
641 rcu_read_lock();
642 dev = dev_get_by_name_rcu(net, name);
643 rcu_read_unlock();
644
645 no_module = !dev;
646 if (no_module && capable(CAP_NET_ADMIN))
647 no_module = request_module("netdev-%s", name);
648 if (no_module && capable(CAP_SYS_MODULE))
649 request_module("%s", name);
650}
651EXPORT_SYMBOL(dev_load);
652
653/*
654 * This function handles all "interface"-type I/O control requests. The actual
655 * 'doing' part of this is dev_ifsioc above.
656 */
657
658/**
659 * dev_ioctl - network device ioctl
660 * @net: the applicable net namespace
661 * @cmd: command to issue
662 * @ifr: pointer to a struct ifreq in user space
663 * @data: data exchanged with userspace
664 * @need_copyout: whether or not copy_to_user() should be called
665 *
666 * Issue ioctl functions to devices. This is normally called by the
667 * user space syscall interfaces but can sometimes be useful for
668 * other purposes. The return value is the return from the syscall if
669 * positive or a negative errno code on error.
670 */
671
672int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
673 void __user *data, bool *need_copyout)
674{
675 int ret;
676 char *colon;
677
678 if (need_copyout)
679 *need_copyout = true;
680 if (cmd == SIOCGIFNAME)
681 return dev_ifname(net, ifr);
682
683 ifr->ifr_name[IFNAMSIZ-1] = 0;
684
685 colon = strchr(ifr->ifr_name, ':');
686 if (colon)
687 *colon = 0;
688
689 /*
690 * See which interface the caller is talking about.
691 */
692
693 switch (cmd) {
694 case SIOCGIFHWADDR:
695 dev_load(net, ifr->ifr_name);
696 ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name);
697 if (colon)
698 *colon = ':';
699 return ret;
700 /*
701 * These ioctl calls:
702 * - can be done by all.
703 * - atomic and do not require locking.
704 * - return a value
705 */
706 case SIOCGIFFLAGS:
707 case SIOCGIFMETRIC:
708 case SIOCGIFMTU:
709 case SIOCGIFSLAVE:
710 case SIOCGIFMAP:
711 case SIOCGIFINDEX:
712 case SIOCGIFTXQLEN:
713 dev_load(net, ifr->ifr_name);
714 rcu_read_lock();
715 ret = dev_ifsioc_locked(net, ifr, cmd);
716 rcu_read_unlock();
717 if (colon)
718 *colon = ':';
719 return ret;
720
721 case SIOCETHTOOL:
722 dev_load(net, ifr->ifr_name);
723 ret = dev_ethtool(net, ifr, data);
724 if (colon)
725 *colon = ':';
726 return ret;
727
728 /*
729 * These ioctl calls:
730 * - require superuser power.
731 * - require strict serialization.
732 * - return a value
733 */
734 case SIOCGMIIPHY:
735 case SIOCGMIIREG:
736 case SIOCSIFNAME:
737 dev_load(net, ifr->ifr_name);
738 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
739 return -EPERM;
740 rtnl_lock();
741 ret = dev_ifsioc(net, ifr, data, cmd);
742 rtnl_unlock();
743 if (colon)
744 *colon = ':';
745 return ret;
746
747 /*
748 * These ioctl calls:
749 * - require superuser power.
750 * - require strict serialization.
751 * - do not return a value
752 */
753 case SIOCSIFMAP:
754 case SIOCSIFTXQLEN:
755 if (!capable(CAP_NET_ADMIN))
756 return -EPERM;
757 fallthrough;
758 /*
759 * These ioctl calls:
760 * - require local superuser power.
761 * - require strict serialization.
762 * - do not return a value
763 */
764 case SIOCSIFFLAGS:
765 case SIOCSIFMETRIC:
766 case SIOCSIFMTU:
767 case SIOCSIFHWADDR:
768 case SIOCSIFSLAVE:
769 case SIOCADDMULTI:
770 case SIOCDELMULTI:
771 case SIOCSIFHWBROADCAST:
772 case SIOCSMIIREG:
773 case SIOCBONDENSLAVE:
774 case SIOCBONDRELEASE:
775 case SIOCBONDSETHWADDR:
776 case SIOCBONDCHANGEACTIVE:
777 case SIOCBRADDIF:
778 case SIOCBRDELIF:
779 case SIOCSHWTSTAMP:
780 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
781 return -EPERM;
782 fallthrough;
783 case SIOCBONDSLAVEINFOQUERY:
784 case SIOCBONDINFOQUERY:
785 dev_load(net, ifr->ifr_name);
786 rtnl_lock();
787 ret = dev_ifsioc(net, ifr, data, cmd);
788 rtnl_unlock();
789 if (need_copyout)
790 *need_copyout = false;
791 return ret;
792
793 case SIOCGIFMEM:
794 /* Get the per device memory space. We can add this but
795 * currently do not support it */
796 case SIOCSIFMEM:
797 /* Set the per device memory buffer space.
798 * Not applicable in our case */
799 case SIOCSIFLINK:
800 return -ENOTTY;
801
802 /*
803 * Unknown or private ioctl.
804 */
805 default:
806 if (cmd == SIOCWANDEV ||
807 cmd == SIOCGHWTSTAMP ||
808 (cmd >= SIOCDEVPRIVATE &&
809 cmd <= SIOCDEVPRIVATE + 15)) {
810 dev_load(net, ifr->ifr_name);
811 rtnl_lock();
812 ret = dev_ifsioc(net, ifr, data, cmd);
813 rtnl_unlock();
814 return ret;
815 }
816 return -ENOTTY;
817 }
818}
1#include <linux/kmod.h>
2#include <linux/netdevice.h>
3#include <linux/etherdevice.h>
4#include <linux/rtnetlink.h>
5#include <linux/net_tstamp.h>
6#include <linux/wireless.h>
7#include <net/wext.h>
8
9/*
10 * Map an interface index to its name (SIOCGIFNAME)
11 */
12
13/*
14 * We need this ioctl for efficient implementation of the
15 * if_indextoname() function required by the IPv6 API. Without
16 * it, we would have to search all the interfaces to find a
17 * match. --pb
18 */
19
20static int dev_ifname(struct net *net, struct ifreq __user *arg)
21{
22 struct ifreq ifr;
23 int error;
24
25 /*
26 * Fetch the caller's info block.
27 */
28
29 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
30 return -EFAULT;
31
32 error = netdev_get_name(net, ifr.ifr_name, ifr.ifr_ifindex);
33 if (error)
34 return error;
35
36 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
37 return -EFAULT;
38 return 0;
39}
40
41static gifconf_func_t *gifconf_list[NPROTO];
42
43/**
44 * register_gifconf - register a SIOCGIF handler
45 * @family: Address family
46 * @gifconf: Function handler
47 *
48 * Register protocol dependent address dumping routines. The handler
49 * that is passed must not be freed or reused until it has been replaced
50 * by another handler.
51 */
52int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
53{
54 if (family >= NPROTO)
55 return -EINVAL;
56 gifconf_list[family] = gifconf;
57 return 0;
58}
59EXPORT_SYMBOL(register_gifconf);
60
61/*
62 * Perform a SIOCGIFCONF call. This structure will change
63 * size eventually, and there is nothing I can do about it.
64 * Thus we will need a 'compatibility mode'.
65 */
66
67static int dev_ifconf(struct net *net, char __user *arg)
68{
69 struct ifconf ifc;
70 struct net_device *dev;
71 char __user *pos;
72 int len;
73 int total;
74 int i;
75
76 /*
77 * Fetch the caller's info block.
78 */
79
80 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
81 return -EFAULT;
82
83 pos = ifc.ifc_buf;
84 len = ifc.ifc_len;
85
86 /*
87 * Loop over the interfaces, and write an info block for each.
88 */
89
90 total = 0;
91 for_each_netdev(net, dev) {
92 for (i = 0; i < NPROTO; i++) {
93 if (gifconf_list[i]) {
94 int done;
95 if (!pos)
96 done = gifconf_list[i](dev, NULL, 0);
97 else
98 done = gifconf_list[i](dev, pos + total,
99 len - total);
100 if (done < 0)
101 return -EFAULT;
102 total += done;
103 }
104 }
105 }
106
107 /*
108 * All done. Write the updated control block back to the caller.
109 */
110 ifc.ifc_len = total;
111
112 /*
113 * Both BSD and Solaris return 0 here, so we do too.
114 */
115 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
116}
117
118/*
119 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
120 */
121static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
122{
123 int err;
124 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
125
126 if (!dev)
127 return -ENODEV;
128
129 switch (cmd) {
130 case SIOCGIFFLAGS: /* Get interface flags */
131 ifr->ifr_flags = (short) dev_get_flags(dev);
132 return 0;
133
134 case SIOCGIFMETRIC: /* Get the metric on the interface
135 (currently unused) */
136 ifr->ifr_metric = 0;
137 return 0;
138
139 case SIOCGIFMTU: /* Get the MTU of a device */
140 ifr->ifr_mtu = dev->mtu;
141 return 0;
142
143 case SIOCGIFHWADDR:
144 if (!dev->addr_len)
145 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
146 else
147 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
148 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
149 ifr->ifr_hwaddr.sa_family = dev->type;
150 return 0;
151
152 case SIOCGIFSLAVE:
153 err = -EINVAL;
154 break;
155
156 case SIOCGIFMAP:
157 ifr->ifr_map.mem_start = dev->mem_start;
158 ifr->ifr_map.mem_end = dev->mem_end;
159 ifr->ifr_map.base_addr = dev->base_addr;
160 ifr->ifr_map.irq = dev->irq;
161 ifr->ifr_map.dma = dev->dma;
162 ifr->ifr_map.port = dev->if_port;
163 return 0;
164
165 case SIOCGIFINDEX:
166 ifr->ifr_ifindex = dev->ifindex;
167 return 0;
168
169 case SIOCGIFTXQLEN:
170 ifr->ifr_qlen = dev->tx_queue_len;
171 return 0;
172
173 default:
174 /* dev_ioctl() should ensure this case
175 * is never reached
176 */
177 WARN_ON(1);
178 err = -ENOTTY;
179 break;
180
181 }
182 return err;
183}
184
185static int net_hwtstamp_validate(struct ifreq *ifr)
186{
187 struct hwtstamp_config cfg;
188 enum hwtstamp_tx_types tx_type;
189 enum hwtstamp_rx_filters rx_filter;
190 int tx_type_valid = 0;
191 int rx_filter_valid = 0;
192
193 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
194 return -EFAULT;
195
196 if (cfg.flags) /* reserved for future extensions */
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 tx_type_valid = 1;
207 break;
208 }
209
210 switch (rx_filter) {
211 case HWTSTAMP_FILTER_NONE:
212 case HWTSTAMP_FILTER_ALL:
213 case HWTSTAMP_FILTER_SOME:
214 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
215 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
216 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
217 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
218 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
219 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
220 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
221 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
222 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
223 case HWTSTAMP_FILTER_PTP_V2_EVENT:
224 case HWTSTAMP_FILTER_PTP_V2_SYNC:
225 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
226 rx_filter_valid = 1;
227 break;
228 }
229
230 if (!tx_type_valid || !rx_filter_valid)
231 return -ERANGE;
232
233 return 0;
234}
235
236/*
237 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
238 */
239static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
240{
241 int err;
242 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
243 const struct net_device_ops *ops;
244
245 if (!dev)
246 return -ENODEV;
247
248 ops = dev->netdev_ops;
249
250 switch (cmd) {
251 case SIOCSIFFLAGS: /* Set interface flags */
252 return dev_change_flags(dev, ifr->ifr_flags);
253
254 case SIOCSIFMETRIC: /* Set the metric on the interface
255 (currently unused) */
256 return -EOPNOTSUPP;
257
258 case SIOCSIFMTU: /* Set the MTU of a device */
259 return dev_set_mtu(dev, ifr->ifr_mtu);
260
261 case SIOCSIFHWADDR:
262 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
263
264 case SIOCSIFHWBROADCAST:
265 if (ifr->ifr_hwaddr.sa_family != dev->type)
266 return -EINVAL;
267 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
268 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
269 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
270 return 0;
271
272 case SIOCSIFMAP:
273 if (ops->ndo_set_config) {
274 if (!netif_device_present(dev))
275 return -ENODEV;
276 return ops->ndo_set_config(dev, &ifr->ifr_map);
277 }
278 return -EOPNOTSUPP;
279
280 case SIOCADDMULTI:
281 if (!ops->ndo_set_rx_mode ||
282 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
283 return -EINVAL;
284 if (!netif_device_present(dev))
285 return -ENODEV;
286 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
287
288 case SIOCDELMULTI:
289 if (!ops->ndo_set_rx_mode ||
290 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
291 return -EINVAL;
292 if (!netif_device_present(dev))
293 return -ENODEV;
294 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
295
296 case SIOCSIFTXQLEN:
297 if (ifr->ifr_qlen < 0)
298 return -EINVAL;
299 dev->tx_queue_len = ifr->ifr_qlen;
300 return 0;
301
302 case SIOCSIFNAME:
303 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
304 return dev_change_name(dev, ifr->ifr_newname);
305
306 case SIOCSHWTSTAMP:
307 err = net_hwtstamp_validate(ifr);
308 if (err)
309 return err;
310 /* fall through */
311
312 /*
313 * Unknown or private ioctl
314 */
315 default:
316 if ((cmd >= SIOCDEVPRIVATE &&
317 cmd <= SIOCDEVPRIVATE + 15) ||
318 cmd == SIOCBONDENSLAVE ||
319 cmd == SIOCBONDRELEASE ||
320 cmd == SIOCBONDSETHWADDR ||
321 cmd == SIOCBONDSLAVEINFOQUERY ||
322 cmd == SIOCBONDINFOQUERY ||
323 cmd == SIOCBONDCHANGEACTIVE ||
324 cmd == SIOCGMIIPHY ||
325 cmd == SIOCGMIIREG ||
326 cmd == SIOCSMIIREG ||
327 cmd == SIOCBRADDIF ||
328 cmd == SIOCBRDELIF ||
329 cmd == SIOCSHWTSTAMP ||
330 cmd == SIOCGHWTSTAMP ||
331 cmd == SIOCWANDEV) {
332 err = -EOPNOTSUPP;
333 if (ops->ndo_do_ioctl) {
334 if (netif_device_present(dev))
335 err = ops->ndo_do_ioctl(dev, ifr, cmd);
336 else
337 err = -ENODEV;
338 }
339 } else
340 err = -EINVAL;
341
342 }
343 return err;
344}
345
346/**
347 * dev_load - load a network module
348 * @net: the applicable net namespace
349 * @name: name of interface
350 *
351 * If a network interface is not present and the process has suitable
352 * privileges this function loads the module. If module loading is not
353 * available in this kernel then it becomes a nop.
354 */
355
356void dev_load(struct net *net, const char *name)
357{
358 struct net_device *dev;
359 int no_module;
360
361 rcu_read_lock();
362 dev = dev_get_by_name_rcu(net, name);
363 rcu_read_unlock();
364
365 no_module = !dev;
366 if (no_module && capable(CAP_NET_ADMIN))
367 no_module = request_module("netdev-%s", name);
368 if (no_module && capable(CAP_SYS_MODULE)) {
369 if (!request_module("%s", name))
370 pr_warn("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
371 name);
372 }
373}
374EXPORT_SYMBOL(dev_load);
375
376/*
377 * This function handles all "interface"-type I/O control requests. The actual
378 * 'doing' part of this is dev_ifsioc above.
379 */
380
381/**
382 * dev_ioctl - network device ioctl
383 * @net: the applicable net namespace
384 * @cmd: command to issue
385 * @arg: pointer to a struct ifreq in user space
386 *
387 * Issue ioctl functions to devices. This is normally called by the
388 * user space syscall interfaces but can sometimes be useful for
389 * other purposes. The return value is the return from the syscall if
390 * positive or a negative errno code on error.
391 */
392
393int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
394{
395 struct ifreq ifr;
396 int ret;
397 char *colon;
398
399 /* One special case: SIOCGIFCONF takes ifconf argument
400 and requires shared lock, because it sleeps writing
401 to user space.
402 */
403
404 if (cmd == SIOCGIFCONF) {
405 rtnl_lock();
406 ret = dev_ifconf(net, (char __user *) arg);
407 rtnl_unlock();
408 return ret;
409 }
410 if (cmd == SIOCGIFNAME)
411 return dev_ifname(net, (struct ifreq __user *)arg);
412
413 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
414 return -EFAULT;
415
416 ifr.ifr_name[IFNAMSIZ-1] = 0;
417
418 colon = strchr(ifr.ifr_name, ':');
419 if (colon)
420 *colon = 0;
421
422 /*
423 * See which interface the caller is talking about.
424 */
425
426 switch (cmd) {
427 /*
428 * These ioctl calls:
429 * - can be done by all.
430 * - atomic and do not require locking.
431 * - return a value
432 */
433 case SIOCGIFFLAGS:
434 case SIOCGIFMETRIC:
435 case SIOCGIFMTU:
436 case SIOCGIFHWADDR:
437 case SIOCGIFSLAVE:
438 case SIOCGIFMAP:
439 case SIOCGIFINDEX:
440 case SIOCGIFTXQLEN:
441 dev_load(net, ifr.ifr_name);
442 rcu_read_lock();
443 ret = dev_ifsioc_locked(net, &ifr, cmd);
444 rcu_read_unlock();
445 if (!ret) {
446 if (colon)
447 *colon = ':';
448 if (copy_to_user(arg, &ifr,
449 sizeof(struct ifreq)))
450 ret = -EFAULT;
451 }
452 return ret;
453
454 case SIOCETHTOOL:
455 dev_load(net, ifr.ifr_name);
456 rtnl_lock();
457 ret = dev_ethtool(net, &ifr);
458 rtnl_unlock();
459 if (!ret) {
460 if (colon)
461 *colon = ':';
462 if (copy_to_user(arg, &ifr,
463 sizeof(struct ifreq)))
464 ret = -EFAULT;
465 }
466 return ret;
467
468 /*
469 * These ioctl calls:
470 * - require superuser power.
471 * - require strict serialization.
472 * - return a value
473 */
474 case SIOCGMIIPHY:
475 case SIOCGMIIREG:
476 case SIOCSIFNAME:
477 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
478 return -EPERM;
479 dev_load(net, ifr.ifr_name);
480 rtnl_lock();
481 ret = dev_ifsioc(net, &ifr, cmd);
482 rtnl_unlock();
483 if (!ret) {
484 if (colon)
485 *colon = ':';
486 if (copy_to_user(arg, &ifr,
487 sizeof(struct ifreq)))
488 ret = -EFAULT;
489 }
490 return ret;
491
492 /*
493 * These ioctl calls:
494 * - require superuser power.
495 * - require strict serialization.
496 * - do not return a value
497 */
498 case SIOCSIFMAP:
499 case SIOCSIFTXQLEN:
500 if (!capable(CAP_NET_ADMIN))
501 return -EPERM;
502 /* fall through */
503 /*
504 * These ioctl calls:
505 * - require local superuser power.
506 * - require strict serialization.
507 * - do not return a value
508 */
509 case SIOCSIFFLAGS:
510 case SIOCSIFMETRIC:
511 case SIOCSIFMTU:
512 case SIOCSIFHWADDR:
513 case SIOCSIFSLAVE:
514 case SIOCADDMULTI:
515 case SIOCDELMULTI:
516 case SIOCSIFHWBROADCAST:
517 case SIOCSMIIREG:
518 case SIOCBONDENSLAVE:
519 case SIOCBONDRELEASE:
520 case SIOCBONDSETHWADDR:
521 case SIOCBONDCHANGEACTIVE:
522 case SIOCBRADDIF:
523 case SIOCBRDELIF:
524 case SIOCSHWTSTAMP:
525 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
526 return -EPERM;
527 /* fall through */
528 case SIOCBONDSLAVEINFOQUERY:
529 case SIOCBONDINFOQUERY:
530 dev_load(net, ifr.ifr_name);
531 rtnl_lock();
532 ret = dev_ifsioc(net, &ifr, cmd);
533 rtnl_unlock();
534 return ret;
535
536 case SIOCGIFMEM:
537 /* Get the per device memory space. We can add this but
538 * currently do not support it */
539 case SIOCSIFMEM:
540 /* Set the per device memory buffer space.
541 * Not applicable in our case */
542 case SIOCSIFLINK:
543 return -ENOTTY;
544
545 /*
546 * Unknown or private ioctl.
547 */
548 default:
549 if (cmd == SIOCWANDEV ||
550 cmd == SIOCGHWTSTAMP ||
551 (cmd >= SIOCDEVPRIVATE &&
552 cmd <= SIOCDEVPRIVATE + 15)) {
553 dev_load(net, ifr.ifr_name);
554 rtnl_lock();
555 ret = dev_ifsioc(net, &ifr, cmd);
556 rtnl_unlock();
557 if (!ret && copy_to_user(arg, &ifr,
558 sizeof(struct ifreq)))
559 ret = -EFAULT;
560 return ret;
561 }
562 /* Take care of Wireless Extensions */
563 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
564 return wext_handle_ioctl(net, &ifr, cmd, arg);
565 return -ENOTTY;
566 }
567}