summaryrefslogtreecommitdiff
path: root/net/core/dev_ioctl.c
blob: 5cdbfbf9a7dcf7e260a56d836fdc6e2afbc44e35 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
// SPDX-License-Identifier: GPL-2.0
#include <linux/kmod.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/net_tstamp.h>
#include <linux/wireless.h>
#include <linux/if_bridge.h>
#include <net/dsa.h>
#include <net/wext.h>

#include "dev.h"

/*
 *	Map an interface index to its name (SIOCGIFNAME)
 */

/*
 *	We need this ioctl for efficient implementation of the
 *	if_indextoname() function required by the IPv6 API.  Without
 *	it, we would have to search all the interfaces to find a
 *	match.  --pb
 */

static int dev_ifname(struct net *net, struct ifreq *ifr)
{
	ifr->ifr_name[IFNAMSIZ-1] = 0;
	return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
}

/*
 *	Perform a SIOCGIFCONF call. This structure will change
 *	size eventually, and there is nothing I can do about it.
 *	Thus we will need a 'compatibility mode'.
 */
int dev_ifconf(struct net *net, struct ifconf __user *uifc)
{
	struct net_device *dev;
	void __user *pos;
	size_t size;
	int len, total = 0, done;

	/* both the ifconf and the ifreq structures are slightly different */
	if (in_compat_syscall()) {
		struct compat_ifconf ifc32;

		if (copy_from_user(&ifc32, uifc, sizeof(struct compat_ifconf)))
			return -EFAULT;

		pos = compat_ptr(ifc32.ifcbuf);
		len = ifc32.ifc_len;
		size = sizeof(struct compat_ifreq);
	} else {
		struct ifconf ifc;

		if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
			return -EFAULT;

		pos = ifc.ifc_buf;
		len = ifc.ifc_len;
		size = sizeof(struct ifreq);
	}

	/* Loop over the interfaces, and write an info block for each. */
	rtnl_lock();
	for_each_netdev(net, dev) {
		if (!pos)
			done = inet_gifconf(dev, NULL, 0, size);
		else
			done = inet_gifconf(dev, pos + total,
					    len - total, size);
		if (done < 0) {
			rtnl_unlock();
			return -EFAULT;
		}
		total += done;
	}
	rtnl_unlock();

	return put_user(total, &uifc->ifc_len);
}

static int dev_getifmap(struct net_device *dev, struct ifreq *ifr)
{
	struct ifmap *ifmap = &ifr->ifr_map;

	if (in_compat_syscall()) {
		struct compat_ifmap *cifmap = (struct compat_ifmap *)ifmap;

		cifmap->mem_start = dev->mem_start;
		cifmap->mem_end   = dev->mem_end;
		cifmap->base_addr = dev->base_addr;
		cifmap->irq       = dev->irq;
		cifmap->dma       = dev->dma;
		cifmap->port      = dev->if_port;

		return 0;
	}

	ifmap->mem_start  = dev->mem_start;
	ifmap->mem_end    = dev->mem_end;
	ifmap->base_addr  = dev->base_addr;
	ifmap->irq        = dev->irq;
	ifmap->dma        = dev->dma;
	ifmap->port       = dev->if_port;

	return 0;
}

static int dev_setifmap(struct net_device *dev, struct ifreq *ifr)
{
	struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map;

	if (!dev->netdev_ops->ndo_set_config)
		return -EOPNOTSUPP;

	if (in_compat_syscall()) {
		struct ifmap ifmap = {
			.mem_start  = cifmap->mem_start,
			.mem_end    = cifmap->mem_end,
			.base_addr  = cifmap->base_addr,
			.irq        = cifmap->irq,
			.dma        = cifmap->dma,
			.port       = cifmap->port,
		};

		return dev->netdev_ops->ndo_set_config(dev, &ifmap);
	}

	return dev->netdev_ops->ndo_set_config(dev, &ifr->ifr_map);
}

/*
 *	Perform the SIOCxIFxxx calls, inside rcu_read_lock()
 */
static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
{
	int err;
	struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);

	if (!dev)
		return -ENODEV;

	switch (cmd) {
	case SIOCGIFFLAGS:	/* Get interface flags */
		ifr->ifr_flags = (short) dev_get_flags(dev);
		return 0;

	case SIOCGIFMETRIC:	/* Get the metric on the interface
				   (currently unused) */
		ifr->ifr_metric = 0;
		return 0;

	case SIOCGIFMTU:	/* Get the MTU of a device */
		ifr->ifr_mtu = dev->mtu;
		return 0;

	case SIOCGIFSLAVE:
		err = -EINVAL;
		break;

	case SIOCGIFMAP:
		return dev_getifmap(dev, ifr);

	case SIOCGIFINDEX:
		ifr->ifr_ifindex = dev->ifindex;
		return 0;

	case SIOCGIFTXQLEN:
		ifr->ifr_qlen = dev->tx_queue_len;
		return 0;

	default:
		/* dev_ioctl() should ensure this case
		 * is never reached
		 */
		WARN_ON(1);
		err = -ENOTTY;
		break;

	}
	return err;
}

static int net_hwtstamp_validate(struct ifreq *ifr)
{
	struct hwtstamp_config cfg;
	enum hwtstamp_tx_types tx_type;
	enum hwtstamp_rx_filters rx_filter;
	int tx_type_valid = 0;
	int rx_filter_valid = 0;

	if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
		return -EFAULT;

	if (cfg.flags & ~HWTSTAMP_FLAG_MASK)
		return -EINVAL;

	tx_type = cfg.tx_type;
	rx_filter = cfg.rx_filter;

	switch (tx_type) {
	case HWTSTAMP_TX_OFF:
	case HWTSTAMP_TX_ON:
	case HWTSTAMP_TX_ONESTEP_SYNC:
	case HWTSTAMP_TX_ONESTEP_P2P:
		tx_type_valid = 1;
		break;
	case __HWTSTAMP_TX_CNT:
		/* not a real value */
		break;
	}

	switch (rx_filter) {
	case HWTSTAMP_FILTER_NONE:
	case HWTSTAMP_FILTER_ALL:
	case HWTSTAMP_FILTER_SOME:
	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
	case HWTSTAMP_FILTER_NTP_ALL:
		rx_filter_valid = 1;
		break;
	case __HWTSTAMP_FILTER_CNT:
		/* not a real value */
		break;
	}

	if (!tx_type_valid || !rx_filter_valid)
		return -ERANGE;

	return 0;
}

static int dev_eth_ioctl(struct net_device *dev,
			 struct ifreq *ifr, unsigned int cmd)
{
	const struct net_device_ops *ops = dev->netdev_ops;
	int err;

	err = dsa_ndo_eth_ioctl(dev, ifr, cmd);
	if (err == 0 || err != -EOPNOTSUPP)
		return err;

	if (ops->ndo_eth_ioctl) {
		if (netif_device_present(dev))
			err = ops->ndo_eth_ioctl(dev, ifr, cmd);
		else
			err = -ENODEV;
	}

	return err;
}

static int dev_siocbond(struct net_device *dev,
			struct ifreq *ifr, unsigned int cmd)
{
	const struct net_device_ops *ops = dev->netdev_ops;

	if (ops->ndo_siocbond) {
		if (netif_device_present(dev))
			return ops->ndo_siocbond(dev, ifr, cmd);
		else
			return -ENODEV;
	}

	return -EOPNOTSUPP;
}

static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
			      void __user *data, unsigned int cmd)
{
	const struct net_device_ops *ops = dev->netdev_ops;

	if (ops->ndo_siocdevprivate) {
		if (netif_device_present(dev))
			return ops->ndo_siocdevprivate(dev, ifr, data, cmd);
		else
			return -ENODEV;
	}

	return -EOPNOTSUPP;
}

static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs)
{
	const struct net_device_ops *ops = dev->netdev_ops;

	if (ops->ndo_siocwandev) {
		if (netif_device_present(dev))
			return ops->ndo_siocwandev(dev, ifs);
		else
			return -ENODEV;
	}

	return -EOPNOTSUPP;
}

/*
 *	Perform the SIOCxIFxxx calls, inside rtnl_lock()
 */
static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
		      unsigned int cmd)
{
	int err;
	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
	const struct net_device_ops *ops;
	netdevice_tracker dev_tracker;

	if (!dev)
		return -ENODEV;

	ops = dev->netdev_ops;

	switch (cmd) {
	case SIOCSIFFLAGS:	/* Set interface flags */
		return dev_change_flags(dev, ifr->ifr_flags, NULL);

	case SIOCSIFMETRIC:	/* Set the metric on the interface
				   (currently unused) */
		return -EOPNOTSUPP;

	case SIOCSIFMTU:	/* Set the MTU of a device */
		return dev_set_mtu(dev, ifr->ifr_mtu);

	case SIOCSIFHWADDR:
		if (dev->addr_len > sizeof(struct sockaddr))
			return -EINVAL;
		return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL);

	case SIOCSIFHWBROADCAST:
		if (ifr->ifr_hwaddr.sa_family != dev->type)
			return -EINVAL;
		memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
		       min(sizeof(ifr->ifr_hwaddr.sa_data_min),
			   (size_t)dev->addr_len));
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
		return 0;

	case SIOCSIFMAP:
		return dev_setifmap(dev, ifr);

	case SIOCADDMULTI:
		if (!ops->ndo_set_rx_mode ||
		    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
			return -EINVAL;
		if (!netif_device_present(dev))
			return -ENODEV;
		return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);

	case SIOCDELMULTI:
		if (!ops->ndo_set_rx_mode ||
		    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
			return -EINVAL;
		if (!netif_device_present(dev))
			return -ENODEV;
		return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);

	case SIOCSIFTXQLEN:
		if (ifr->ifr_qlen < 0)
			return -EINVAL;
		return dev_change_tx_queue_len(dev, ifr->ifr_qlen);

	case SIOCSIFNAME:
		ifr->ifr_newname[IFNAMSIZ-1] = '\0';
		return dev_change_name(dev, ifr->ifr_newname);

	case SIOCWANDEV:
		return dev_siocwandev(dev, &ifr->ifr_settings);

	case SIOCBRADDIF:
	case SIOCBRDELIF:
		if (!netif_device_present(dev))
			return -ENODEV;
		if (!netif_is_bridge_master(dev))
			return -EOPNOTSUPP;
		netdev_hold(dev, &dev_tracker, GFP_KERNEL);
		rtnl_unlock();
		err = br_ioctl_call(net, netdev_priv(dev), cmd, ifr, NULL);
		netdev_put(dev, &dev_tracker);
		rtnl_lock();
		return err;

	case SIOCSHWTSTAMP:
		err = net_hwtstamp_validate(ifr);
		if (err)
			return err;
		fallthrough;

	/*
	 *	Unknown or private ioctl
	 */
	default:
		if (cmd >= SIOCDEVPRIVATE &&
		    cmd <= SIOCDEVPRIVATE + 15)
			return dev_siocdevprivate(dev, ifr, data, cmd);

		if (cmd == SIOCGMIIPHY ||
		    cmd == SIOCGMIIREG ||
		    cmd == SIOCSMIIREG ||
		    cmd == SIOCSHWTSTAMP ||
		    cmd == SIOCGHWTSTAMP) {
			err = dev_eth_ioctl(dev, ifr, cmd);
		} else if (cmd == SIOCBONDENSLAVE ||
		    cmd == SIOCBONDRELEASE ||
		    cmd == SIOCBONDSETHWADDR ||
		    cmd == SIOCBONDSLAVEINFOQUERY ||
		    cmd == SIOCBONDINFOQUERY ||
		    cmd == SIOCBONDCHANGEACTIVE) {
			err = dev_siocbond(dev, ifr, cmd);
		} else
			err = -EINVAL;

	}
	return err;
}

/**
 *	dev_load 	- load a network module
 *	@net: the applicable net namespace
 *	@name: name of interface
 *
 *	If a network interface is not present and the process has suitable
 *	privileges this function loads the module. If module loading is not
 *	available in this kernel then it becomes a nop.
 */

void dev_load(struct net *net, const char *name)
{
	struct net_device *dev;
	int no_module;

	rcu_read_lock();
	dev = dev_get_by_name_rcu(net, name);
	rcu_read_unlock();

	no_module = !dev;
	if (no_module && capable(CAP_NET_ADMIN))
		no_module = request_module("netdev-%s", name);
	if (no_module && capable(CAP_SYS_MODULE))
		request_module("%s", name);
}
EXPORT_SYMBOL(dev_load);

/*
 *	This function handles all "interface"-type I/O control requests. The actual
 *	'doing' part of this is dev_ifsioc above.
 */

/**
 *	dev_ioctl	-	network device ioctl
 *	@net: the applicable net namespace
 *	@cmd: command to issue
 *	@ifr: pointer to a struct ifreq in user space
 *	@need_copyout: whether or not copy_to_user() should be called
 *
 *	Issue ioctl functions to devices. This is normally called by the
 *	user space syscall interfaces but can sometimes be useful for
 *	other purposes. The return value is the return from the syscall if
 *	positive or a negative errno code on error.
 */

int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
	      void __user *data, bool *need_copyout)
{
	int ret;
	char *colon;

	if (need_copyout)
		*need_copyout = true;
	if (cmd == SIOCGIFNAME)
		return dev_ifname(net, ifr);

	ifr->ifr_name[IFNAMSIZ-1] = 0;

	colon = strchr(ifr->ifr_name, ':');
	if (colon)
		*colon = 0;

	/*
	 *	See which interface the caller is talking about.
	 */

	switch (cmd) {
	case SIOCGIFHWADDR:
		dev_load(net, ifr->ifr_name);
		ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name);
		if (colon)
			*colon = ':';
		return ret;
	/*
	 *	These ioctl calls:
	 *	- can be done by all.
	 *	- atomic and do not require locking.
	 *	- return a value
	 */
	case SIOCGIFFLAGS:
	case SIOCGIFMETRIC:
	case SIOCGIFMTU:
	case SIOCGIFSLAVE:
	case SIOCGIFMAP:
	case SIOCGIFINDEX:
	case SIOCGIFTXQLEN:
		dev_load(net, ifr->ifr_name);
		rcu_read_lock();
		ret = dev_ifsioc_locked(net, ifr, cmd);
		rcu_read_unlock();
		if (colon)
			*colon = ':';
		return ret;

	case SIOCETHTOOL:
		dev_load(net, ifr->ifr_name);
		ret = dev_ethtool(net, ifr, data);
		if (colon)
			*colon = ':';
		return ret;

	/*
	 *	These ioctl calls:
	 *	- require superuser power.
	 *	- require strict serialization.
	 *	- return a value
	 */
	case SIOCGMIIPHY:
	case SIOCGMIIREG:
	case SIOCSIFNAME:
		dev_load(net, ifr->ifr_name);
		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
			return -EPERM;
		rtnl_lock();
		ret = dev_ifsioc(net, ifr, data, cmd);
		rtnl_unlock();
		if (colon)
			*colon = ':';
		return ret;

	/*
	 *	These ioctl calls:
	 *	- require superuser power.
	 *	- require strict serialization.
	 *	- do not return a value
	 */
	case SIOCSIFMAP:
	case SIOCSIFTXQLEN:
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		fallthrough;
	/*
	 *	These ioctl calls:
	 *	- require local superuser power.
	 *	- require strict serialization.
	 *	- do not return a value
	 */
	case SIOCSIFFLAGS:
	case SIOCSIFMETRIC:
	case SIOCSIFMTU:
	case SIOCSIFHWADDR:
	case SIOCSIFSLAVE:
	case SIOCADDMULTI:
	case SIOCDELMULTI:
	case SIOCSIFHWBROADCAST:
	case SIOCSMIIREG:
	case SIOCBONDENSLAVE:
	case SIOCBONDRELEASE:
	case SIOCBONDSETHWADDR:
	case SIOCBONDCHANGEACTIVE:
	case SIOCBRADDIF:
	case SIOCBRDELIF:
	case SIOCSHWTSTAMP:
		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
			return -EPERM;
		fallthrough;
	case SIOCBONDSLAVEINFOQUERY:
	case SIOCBONDINFOQUERY:
		dev_load(net, ifr->ifr_name);
		rtnl_lock();
		ret = dev_ifsioc(net, ifr, data, cmd);
		rtnl_unlock();
		if (need_copyout)
			*need_copyout = false;
		return ret;

	case SIOCGIFMEM:
		/* Get the per device memory space. We can add this but
		 * currently do not support it */
	case SIOCSIFMEM:
		/* Set the per device memory buffer space.
		 * Not applicable in our case */
	case SIOCSIFLINK:
		return -ENOTTY;

	/*
	 *	Unknown or private ioctl.
	 */
	default:
		if (cmd == SIOCWANDEV ||
		    cmd == SIOCGHWTSTAMP ||
		    (cmd >= SIOCDEVPRIVATE &&
		     cmd <= SIOCDEVPRIVATE + 15)) {
			dev_load(net, ifr->ifr_name);
			rtnl_lock();
			ret = dev_ifsioc(net, ifr, data, cmd);
			rtnl_unlock();
			return ret;
		}
		return -ENOTTY;
	}
}