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v5.14.15
  1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/kmod.h>
  3#include <linux/netdevice.h>
 
  4#include <linux/etherdevice.h>
  5#include <linux/rtnetlink.h>
  6#include <linux/net_tstamp.h>
  7#include <linux/wireless.h>
 
  8#include <net/dsa.h>
  9#include <net/wext.h>
 10
 
 
 11/*
 12 *	Map an interface index to its name (SIOCGIFNAME)
 13 */
 14
 15/*
 16 *	We need this ioctl for efficient implementation of the
 17 *	if_indextoname() function required by the IPv6 API.  Without
 18 *	it, we would have to search all the interfaces to find a
 19 *	match.  --pb
 20 */
 21
 22static int dev_ifname(struct net *net, struct ifreq *ifr)
 23{
 24	ifr->ifr_name[IFNAMSIZ-1] = 0;
 25	return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
 26}
 27
 28static gifconf_func_t *gifconf_list[NPROTO];
 29
 30/**
 31 *	register_gifconf	-	register a SIOCGIF handler
 32 *	@family: Address family
 33 *	@gifconf: Function handler
 34 *
 35 *	Register protocol dependent address dumping routines. The handler
 36 *	that is passed must not be freed or reused until it has been replaced
 37 *	by another handler.
 38 */
 39int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
 40{
 41	if (family >= NPROTO)
 42		return -EINVAL;
 43	gifconf_list[family] = gifconf;
 44	return 0;
 45}
 46EXPORT_SYMBOL(register_gifconf);
 47
 48/*
 49 *	Perform a SIOCGIFCONF call. This structure will change
 50 *	size eventually, and there is nothing I can do about it.
 51 *	Thus we will need a 'compatibility mode'.
 52 */
 53
 54int dev_ifconf(struct net *net, struct ifconf *ifc, int size)
 55{
 56	struct net_device *dev;
 57	char __user *pos;
 58	int len;
 59	int total;
 60	int i;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 61
 62	/*
 63	 *	Fetch the caller's info block.
 64	 */
 
 
 
 
 
 
 
 
 
 
 
 
 65
 66	pos = ifc->ifc_buf;
 67	len = ifc->ifc_len;
 68
 69	/*
 70	 *	Loop over the interfaces, and write an info block for each.
 71	 */
 72
 73	total = 0;
 74	for_each_netdev(net, dev) {
 75		for (i = 0; i < NPROTO; i++) {
 76			if (gifconf_list[i]) {
 77				int done;
 78				if (!pos)
 79					done = gifconf_list[i](dev, NULL, 0, size);
 80				else
 81					done = gifconf_list[i](dev, pos + total,
 82							       len - total, size);
 83				if (done < 0)
 84					return -EFAULT;
 85				total += done;
 86			}
 87		}
 88	}
 89
 90	/*
 91	 *	All done.  Write the updated control block back to the caller.
 92	 */
 93	ifc->ifc_len = total;
 
 
 94
 95	/*
 96	 * 	Both BSD and Solaris return 0 here, so we do too.
 97	 */
 98	return 0;
 99}
100
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
101/*
102 *	Perform the SIOCxIFxxx calls, inside rcu_read_lock()
103 */
104static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
105{
106	int err;
107	struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
108
109	if (!dev)
110		return -ENODEV;
111
112	switch (cmd) {
113	case SIOCGIFFLAGS:	/* Get interface flags */
114		ifr->ifr_flags = (short) dev_get_flags(dev);
115		return 0;
116
117	case SIOCGIFMETRIC:	/* Get the metric on the interface
118				   (currently unused) */
119		ifr->ifr_metric = 0;
120		return 0;
121
122	case SIOCGIFMTU:	/* Get the MTU of a device */
123		ifr->ifr_mtu = dev->mtu;
124		return 0;
125
126	case SIOCGIFSLAVE:
127		err = -EINVAL;
128		break;
129
130	case SIOCGIFMAP:
131		ifr->ifr_map.mem_start = dev->mem_start;
132		ifr->ifr_map.mem_end   = dev->mem_end;
133		ifr->ifr_map.base_addr = dev->base_addr;
134		ifr->ifr_map.irq       = dev->irq;
135		ifr->ifr_map.dma       = dev->dma;
136		ifr->ifr_map.port      = dev->if_port;
137		return 0;
138
139	case SIOCGIFINDEX:
140		ifr->ifr_ifindex = dev->ifindex;
141		return 0;
142
143	case SIOCGIFTXQLEN:
144		ifr->ifr_qlen = dev->tx_queue_len;
145		return 0;
146
147	default:
148		/* dev_ioctl() should ensure this case
149		 * is never reached
150		 */
151		WARN_ON(1);
152		err = -ENOTTY;
153		break;
154
155	}
156	return err;
157}
158
159static int net_hwtstamp_validate(struct ifreq *ifr)
160{
161	struct hwtstamp_config cfg;
162	enum hwtstamp_tx_types tx_type;
163	enum hwtstamp_rx_filters rx_filter;
164	int tx_type_valid = 0;
165	int rx_filter_valid = 0;
166
167	if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
168		return -EFAULT;
169
170	if (cfg.flags) /* reserved for future extensions */
171		return -EINVAL;
172
173	tx_type = cfg.tx_type;
174	rx_filter = cfg.rx_filter;
175
176	switch (tx_type) {
177	case HWTSTAMP_TX_OFF:
178	case HWTSTAMP_TX_ON:
179	case HWTSTAMP_TX_ONESTEP_SYNC:
180	case HWTSTAMP_TX_ONESTEP_P2P:
181		tx_type_valid = 1;
182		break;
183	case __HWTSTAMP_TX_CNT:
184		/* not a real value */
185		break;
186	}
187
188	switch (rx_filter) {
189	case HWTSTAMP_FILTER_NONE:
190	case HWTSTAMP_FILTER_ALL:
191	case HWTSTAMP_FILTER_SOME:
192	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
193	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
194	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
195	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
196	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
197	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
198	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
199	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
200	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
201	case HWTSTAMP_FILTER_PTP_V2_EVENT:
202	case HWTSTAMP_FILTER_PTP_V2_SYNC:
203	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
204	case HWTSTAMP_FILTER_NTP_ALL:
205		rx_filter_valid = 1;
206		break;
207	case __HWTSTAMP_FILTER_CNT:
208		/* not a real value */
209		break;
210	}
211
212	if (!tx_type_valid || !rx_filter_valid)
213		return -ERANGE;
214
215	return 0;
216}
217
218static int dev_do_ioctl(struct net_device *dev,
219			struct ifreq *ifr, unsigned int cmd)
220{
221	const struct net_device_ops *ops = dev->netdev_ops;
222	int err;
223
224	err = dsa_ndo_do_ioctl(dev, ifr, cmd);
225	if (err == 0 || err != -EOPNOTSUPP)
226		return err;
227
228	if (ops->ndo_do_ioctl) {
229		if (netif_device_present(dev))
230			err = ops->ndo_do_ioctl(dev, ifr, cmd);
231		else
232			err = -ENODEV;
233	}
234
235	return err;
236}
237
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
238/*
239 *	Perform the SIOCxIFxxx calls, inside rtnl_lock()
240 */
241static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
 
242{
243	int err;
244	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
245	const struct net_device_ops *ops;
 
246
247	if (!dev)
248		return -ENODEV;
249
250	ops = dev->netdev_ops;
251
252	switch (cmd) {
253	case SIOCSIFFLAGS:	/* Set interface flags */
254		return dev_change_flags(dev, ifr->ifr_flags, NULL);
255
256	case SIOCSIFMETRIC:	/* Set the metric on the interface
257				   (currently unused) */
258		return -EOPNOTSUPP;
259
260	case SIOCSIFMTU:	/* Set the MTU of a device */
261		return dev_set_mtu(dev, ifr->ifr_mtu);
262
263	case SIOCSIFHWADDR:
264		if (dev->addr_len > sizeof(struct sockaddr))
265			return -EINVAL;
266		return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL);
267
268	case SIOCSIFHWBROADCAST:
269		if (ifr->ifr_hwaddr.sa_family != dev->type)
270			return -EINVAL;
271		memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
272		       min(sizeof(ifr->ifr_hwaddr.sa_data),
273			   (size_t)dev->addr_len));
274		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
275		return 0;
276
277	case SIOCSIFMAP:
278		if (ops->ndo_set_config) {
279			if (!netif_device_present(dev))
280				return -ENODEV;
281			return ops->ndo_set_config(dev, &ifr->ifr_map);
282		}
283		return -EOPNOTSUPP;
284
285	case SIOCADDMULTI:
286		if (!ops->ndo_set_rx_mode ||
287		    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
288			return -EINVAL;
289		if (!netif_device_present(dev))
290			return -ENODEV;
291		return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
292
293	case SIOCDELMULTI:
294		if (!ops->ndo_set_rx_mode ||
295		    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
296			return -EINVAL;
297		if (!netif_device_present(dev))
298			return -ENODEV;
299		return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
300
301	case SIOCSIFTXQLEN:
302		if (ifr->ifr_qlen < 0)
303			return -EINVAL;
304		return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
305
306	case SIOCSIFNAME:
307		ifr->ifr_newname[IFNAMSIZ-1] = '\0';
308		return dev_change_name(dev, ifr->ifr_newname);
309
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
310	case SIOCSHWTSTAMP:
311		err = net_hwtstamp_validate(ifr);
312		if (err)
313			return err;
314		fallthrough;
315
316	/*
317	 *	Unknown or private ioctl
318	 */
319	default:
320		if ((cmd >= SIOCDEVPRIVATE &&
321		    cmd <= SIOCDEVPRIVATE + 15) ||
322		    cmd == SIOCBONDENSLAVE ||
 
 
 
 
 
 
 
 
323		    cmd == SIOCBONDRELEASE ||
324		    cmd == SIOCBONDSETHWADDR ||
325		    cmd == SIOCBONDSLAVEINFOQUERY ||
326		    cmd == SIOCBONDINFOQUERY ||
327		    cmd == SIOCBONDCHANGEACTIVE ||
328		    cmd == SIOCGMIIPHY ||
329		    cmd == SIOCGMIIREG ||
330		    cmd == SIOCSMIIREG ||
331		    cmd == SIOCBRADDIF ||
332		    cmd == SIOCBRDELIF ||
333		    cmd == SIOCSHWTSTAMP ||
334		    cmd == SIOCGHWTSTAMP ||
335		    cmd == SIOCWANDEV) {
336			err = dev_do_ioctl(dev, ifr, cmd);
337		} else
338			err = -EINVAL;
339
340	}
341	return err;
342}
343
344/**
345 *	dev_load 	- load a network module
346 *	@net: the applicable net namespace
347 *	@name: name of interface
348 *
349 *	If a network interface is not present and the process has suitable
350 *	privileges this function loads the module. If module loading is not
351 *	available in this kernel then it becomes a nop.
352 */
353
354void dev_load(struct net *net, const char *name)
355{
356	struct net_device *dev;
357	int no_module;
358
359	rcu_read_lock();
360	dev = dev_get_by_name_rcu(net, name);
361	rcu_read_unlock();
362
363	no_module = !dev;
364	if (no_module && capable(CAP_NET_ADMIN))
365		no_module = request_module("netdev-%s", name);
366	if (no_module && capable(CAP_SYS_MODULE))
367		request_module("%s", name);
368}
369EXPORT_SYMBOL(dev_load);
370
371/*
372 *	This function handles all "interface"-type I/O control requests. The actual
373 *	'doing' part of this is dev_ifsioc above.
374 */
375
376/**
377 *	dev_ioctl	-	network device ioctl
378 *	@net: the applicable net namespace
379 *	@cmd: command to issue
380 *	@ifr: pointer to a struct ifreq in user space
381 *	@need_copyout: whether or not copy_to_user() should be called
382 *
383 *	Issue ioctl functions to devices. This is normally called by the
384 *	user space syscall interfaces but can sometimes be useful for
385 *	other purposes. The return value is the return from the syscall if
386 *	positive or a negative errno code on error.
387 */
388
389int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_copyout)
 
390{
391	int ret;
392	char *colon;
393
394	if (need_copyout)
395		*need_copyout = true;
396	if (cmd == SIOCGIFNAME)
397		return dev_ifname(net, ifr);
398
399	ifr->ifr_name[IFNAMSIZ-1] = 0;
400
401	colon = strchr(ifr->ifr_name, ':');
402	if (colon)
403		*colon = 0;
404
405	/*
406	 *	See which interface the caller is talking about.
407	 */
408
409	switch (cmd) {
410	case SIOCGIFHWADDR:
411		dev_load(net, ifr->ifr_name);
412		ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name);
413		if (colon)
414			*colon = ':';
415		return ret;
416	/*
417	 *	These ioctl calls:
418	 *	- can be done by all.
419	 *	- atomic and do not require locking.
420	 *	- return a value
421	 */
422	case SIOCGIFFLAGS:
423	case SIOCGIFMETRIC:
424	case SIOCGIFMTU:
425	case SIOCGIFSLAVE:
426	case SIOCGIFMAP:
427	case SIOCGIFINDEX:
428	case SIOCGIFTXQLEN:
429		dev_load(net, ifr->ifr_name);
430		rcu_read_lock();
431		ret = dev_ifsioc_locked(net, ifr, cmd);
432		rcu_read_unlock();
433		if (colon)
434			*colon = ':';
435		return ret;
436
437	case SIOCETHTOOL:
438		dev_load(net, ifr->ifr_name);
439		rtnl_lock();
440		ret = dev_ethtool(net, ifr);
441		rtnl_unlock();
442		if (colon)
443			*colon = ':';
444		return ret;
445
446	/*
447	 *	These ioctl calls:
448	 *	- require superuser power.
449	 *	- require strict serialization.
450	 *	- return a value
451	 */
452	case SIOCGMIIPHY:
453	case SIOCGMIIREG:
454	case SIOCSIFNAME:
455		dev_load(net, ifr->ifr_name);
456		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
457			return -EPERM;
458		rtnl_lock();
459		ret = dev_ifsioc(net, ifr, cmd);
460		rtnl_unlock();
461		if (colon)
462			*colon = ':';
463		return ret;
464
465	/*
466	 *	These ioctl calls:
467	 *	- require superuser power.
468	 *	- require strict serialization.
469	 *	- do not return a value
470	 */
471	case SIOCSIFMAP:
472	case SIOCSIFTXQLEN:
473		if (!capable(CAP_NET_ADMIN))
474			return -EPERM;
475		fallthrough;
476	/*
477	 *	These ioctl calls:
478	 *	- require local superuser power.
479	 *	- require strict serialization.
480	 *	- do not return a value
481	 */
482	case SIOCSIFFLAGS:
483	case SIOCSIFMETRIC:
484	case SIOCSIFMTU:
485	case SIOCSIFHWADDR:
486	case SIOCSIFSLAVE:
487	case SIOCADDMULTI:
488	case SIOCDELMULTI:
489	case SIOCSIFHWBROADCAST:
490	case SIOCSMIIREG:
491	case SIOCBONDENSLAVE:
492	case SIOCBONDRELEASE:
493	case SIOCBONDSETHWADDR:
494	case SIOCBONDCHANGEACTIVE:
495	case SIOCBRADDIF:
496	case SIOCBRDELIF:
497	case SIOCSHWTSTAMP:
498		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
499			return -EPERM;
500		fallthrough;
501	case SIOCBONDSLAVEINFOQUERY:
502	case SIOCBONDINFOQUERY:
503		dev_load(net, ifr->ifr_name);
504		rtnl_lock();
505		ret = dev_ifsioc(net, ifr, cmd);
506		rtnl_unlock();
507		if (need_copyout)
508			*need_copyout = false;
509		return ret;
510
511	case SIOCGIFMEM:
512		/* Get the per device memory space. We can add this but
513		 * currently do not support it */
514	case SIOCSIFMEM:
515		/* Set the per device memory buffer space.
516		 * Not applicable in our case */
517	case SIOCSIFLINK:
518		return -ENOTTY;
519
520	/*
521	 *	Unknown or private ioctl.
522	 */
523	default:
524		if (cmd == SIOCWANDEV ||
525		    cmd == SIOCGHWTSTAMP ||
526		    (cmd >= SIOCDEVPRIVATE &&
527		     cmd <= SIOCDEVPRIVATE + 15)) {
528			dev_load(net, ifr->ifr_name);
529			rtnl_lock();
530			ret = dev_ifsioc(net, ifr, cmd);
531			rtnl_unlock();
532			return ret;
533		}
534		return -ENOTTY;
535	}
536}
v6.2
  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/wireless.h>
  9#include <linux/if_bridge.h>
 10#include <net/dsa.h>
 11#include <net/wext.h>
 12
 13#include "dev.h"
 14
 15/*
 16 *	Map an interface index to its name (SIOCGIFNAME)
 17 */
 18
 19/*
 20 *	We need this ioctl for efficient implementation of the
 21 *	if_indextoname() function required by the IPv6 API.  Without
 22 *	it, we would have to search all the interfaces to find a
 23 *	match.  --pb
 24 */
 25
 26static int dev_ifname(struct net *net, struct ifreq *ifr)
 27{
 28	ifr->ifr_name[IFNAMSIZ-1] = 0;
 29	return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
 30}
 31
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 32/*
 33 *	Perform a SIOCGIFCONF call. This structure will change
 34 *	size eventually, and there is nothing I can do about it.
 35 *	Thus we will need a 'compatibility mode'.
 36 */
 37int dev_ifconf(struct net *net, struct ifconf __user *uifc)
 
 38{
 39	struct net_device *dev;
 40	void __user *pos;
 41	size_t size;
 42	int len, total = 0, done;
 43
 44	/* both the ifconf and the ifreq structures are slightly different */
 45	if (in_compat_syscall()) {
 46		struct compat_ifconf ifc32;
 47
 48		if (copy_from_user(&ifc32, uifc, sizeof(struct compat_ifconf)))
 49			return -EFAULT;
 50
 51		pos = compat_ptr(ifc32.ifcbuf);
 52		len = ifc32.ifc_len;
 53		size = sizeof(struct compat_ifreq);
 54	} else {
 55		struct ifconf ifc;
 56
 57		if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
 58			return -EFAULT;
 59
 60		pos = ifc.ifc_buf;
 61		len = ifc.ifc_len;
 62		size = sizeof(struct ifreq);
 63	}
 64
 65	/* Loop over the interfaces, and write an info block for each. */
 66	rtnl_lock();
 67	for_each_netdev(net, dev) {
 68		if (!pos)
 69			done = inet_gifconf(dev, NULL, 0, size);
 70		else
 71			done = inet_gifconf(dev, pos + total,
 72					    len - total, size);
 73		if (done < 0) {
 74			rtnl_unlock();
 75			return -EFAULT;
 76		}
 77		total += done;
 78	}
 79	rtnl_unlock();
 80
 81	return put_user(total, &uifc->ifc_len);
 82}
 83
 84static int dev_getifmap(struct net_device *dev, struct ifreq *ifr)
 85{
 86	struct ifmap *ifmap = &ifr->ifr_map;
 87
 88	if (in_compat_syscall()) {
 89		struct compat_ifmap *cifmap = (struct compat_ifmap *)ifmap;
 90
 91		cifmap->mem_start = dev->mem_start;
 92		cifmap->mem_end   = dev->mem_end;
 93		cifmap->base_addr = dev->base_addr;
 94		cifmap->irq       = dev->irq;
 95		cifmap->dma       = dev->dma;
 96		cifmap->port      = dev->if_port;
 97
 98		return 0;
 
 
 
 
 99	}
100
101	ifmap->mem_start  = dev->mem_start;
102	ifmap->mem_end    = dev->mem_end;
103	ifmap->base_addr  = dev->base_addr;
104	ifmap->irq        = dev->irq;
105	ifmap->dma        = dev->dma;
106	ifmap->port       = dev->if_port;
107
 
 
 
108	return 0;
109}
110
111static int dev_setifmap(struct net_device *dev, struct ifreq *ifr)
112{
113	struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map;
114
115	if (!dev->netdev_ops->ndo_set_config)
116		return -EOPNOTSUPP;
117
118	if (in_compat_syscall()) {
119		struct ifmap ifmap = {
120			.mem_start  = cifmap->mem_start,
121			.mem_end    = cifmap->mem_end,
122			.base_addr  = cifmap->base_addr,
123			.irq        = cifmap->irq,
124			.dma        = cifmap->dma,
125			.port       = cifmap->port,
126		};
127
128		return dev->netdev_ops->ndo_set_config(dev, &ifmap);
129	}
130
131	return dev->netdev_ops->ndo_set_config(dev, &ifr->ifr_map);
132}
133
134/*
135 *	Perform the SIOCxIFxxx calls, inside rcu_read_lock()
136 */
137static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
138{
139	int err;
140	struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
141
142	if (!dev)
143		return -ENODEV;
144
145	switch (cmd) {
146	case SIOCGIFFLAGS:	/* Get interface flags */
147		ifr->ifr_flags = (short) dev_get_flags(dev);
148		return 0;
149
150	case SIOCGIFMETRIC:	/* Get the metric on the interface
151				   (currently unused) */
152		ifr->ifr_metric = 0;
153		return 0;
154
155	case SIOCGIFMTU:	/* Get the MTU of a device */
156		ifr->ifr_mtu = dev->mtu;
157		return 0;
158
159	case SIOCGIFSLAVE:
160		err = -EINVAL;
161		break;
162
163	case SIOCGIFMAP:
164		return dev_getifmap(dev, ifr);
 
 
 
 
 
 
165
166	case SIOCGIFINDEX:
167		ifr->ifr_ifindex = dev->ifindex;
168		return 0;
169
170	case SIOCGIFTXQLEN:
171		ifr->ifr_qlen = dev->tx_queue_len;
172		return 0;
173
174	default:
175		/* dev_ioctl() should ensure this case
176		 * is never reached
177		 */
178		WARN_ON(1);
179		err = -ENOTTY;
180		break;
181
182	}
183	return err;
184}
185
186static int net_hwtstamp_validate(struct ifreq *ifr)
187{
188	struct hwtstamp_config cfg;
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 (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
195		return -EFAULT;
196
197	if (cfg.flags & ~HWTSTAMP_FLAG_MASK)
198		return -EINVAL;
199
200	tx_type = cfg.tx_type;
201	rx_filter = cfg.rx_filter;
202
203	switch (tx_type) {
204	case HWTSTAMP_TX_OFF:
205	case HWTSTAMP_TX_ON:
206	case HWTSTAMP_TX_ONESTEP_SYNC:
207	case HWTSTAMP_TX_ONESTEP_P2P:
208		tx_type_valid = 1;
209		break;
210	case __HWTSTAMP_TX_CNT:
211		/* not a real value */
212		break;
213	}
214
215	switch (rx_filter) {
216	case HWTSTAMP_FILTER_NONE:
217	case HWTSTAMP_FILTER_ALL:
218	case HWTSTAMP_FILTER_SOME:
219	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
220	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
221	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
222	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
223	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
224	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
225	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
226	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
227	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
228	case HWTSTAMP_FILTER_PTP_V2_EVENT:
229	case HWTSTAMP_FILTER_PTP_V2_SYNC:
230	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
231	case HWTSTAMP_FILTER_NTP_ALL:
232		rx_filter_valid = 1;
233		break;
234	case __HWTSTAMP_FILTER_CNT:
235		/* not a real value */
236		break;
237	}
238
239	if (!tx_type_valid || !rx_filter_valid)
240		return -ERANGE;
241
242	return 0;
243}
244
245static int dev_eth_ioctl(struct net_device *dev,
246			 struct ifreq *ifr, unsigned int cmd)
247{
248	const struct net_device_ops *ops = dev->netdev_ops;
249	int err;
250
251	err = dsa_ndo_eth_ioctl(dev, ifr, cmd);
252	if (err == 0 || err != -EOPNOTSUPP)
253		return err;
254
255	if (ops->ndo_eth_ioctl) {
256		if (netif_device_present(dev))
257			err = ops->ndo_eth_ioctl(dev, ifr, cmd);
258		else
259			err = -ENODEV;
260	}
261
262	return err;
263}
264
265static int dev_siocbond(struct net_device *dev,
266			struct ifreq *ifr, unsigned int cmd)
267{
268	const struct net_device_ops *ops = dev->netdev_ops;
269
270	if (ops->ndo_siocbond) {
271		if (netif_device_present(dev))
272			return ops->ndo_siocbond(dev, ifr, cmd);
273		else
274			return -ENODEV;
275	}
276
277	return -EOPNOTSUPP;
278}
279
280static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
281			      void __user *data, unsigned int cmd)
282{
283	const struct net_device_ops *ops = dev->netdev_ops;
284
285	if (ops->ndo_siocdevprivate) {
286		if (netif_device_present(dev))
287			return ops->ndo_siocdevprivate(dev, ifr, data, cmd);
288		else
289			return -ENODEV;
290	}
291
292	return -EOPNOTSUPP;
293}
294
295static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs)
296{
297	const struct net_device_ops *ops = dev->netdev_ops;
298
299	if (ops->ndo_siocwandev) {
300		if (netif_device_present(dev))
301			return ops->ndo_siocwandev(dev, ifs);
302		else
303			return -ENODEV;
304	}
305
306	return -EOPNOTSUPP;
307}
308
309/*
310 *	Perform the SIOCxIFxxx calls, inside rtnl_lock()
311 */
312static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
313		      unsigned int cmd)
314{
315	int err;
316	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
317	const struct net_device_ops *ops;
318	netdevice_tracker dev_tracker;
319
320	if (!dev)
321		return -ENODEV;
322
323	ops = dev->netdev_ops;
324
325	switch (cmd) {
326	case SIOCSIFFLAGS:	/* Set interface flags */
327		return dev_change_flags(dev, ifr->ifr_flags, NULL);
328
329	case SIOCSIFMETRIC:	/* Set the metric on the interface
330				   (currently unused) */
331		return -EOPNOTSUPP;
332
333	case SIOCSIFMTU:	/* Set the MTU of a device */
334		return dev_set_mtu(dev, ifr->ifr_mtu);
335
336	case SIOCSIFHWADDR:
337		if (dev->addr_len > sizeof(struct sockaddr))
338			return -EINVAL;
339		return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL);
340
341	case SIOCSIFHWBROADCAST:
342		if (ifr->ifr_hwaddr.sa_family != dev->type)
343			return -EINVAL;
344		memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
345		       min(sizeof(ifr->ifr_hwaddr.sa_data_min),
346			   (size_t)dev->addr_len));
347		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
348		return 0;
349
350	case SIOCSIFMAP:
351		return dev_setifmap(dev, ifr);
 
 
 
 
 
352
353	case SIOCADDMULTI:
354		if (!ops->ndo_set_rx_mode ||
355		    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
356			return -EINVAL;
357		if (!netif_device_present(dev))
358			return -ENODEV;
359		return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
360
361	case SIOCDELMULTI:
362		if (!ops->ndo_set_rx_mode ||
363		    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
364			return -EINVAL;
365		if (!netif_device_present(dev))
366			return -ENODEV;
367		return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
368
369	case SIOCSIFTXQLEN:
370		if (ifr->ifr_qlen < 0)
371			return -EINVAL;
372		return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
373
374	case SIOCSIFNAME:
375		ifr->ifr_newname[IFNAMSIZ-1] = '\0';
376		return dev_change_name(dev, ifr->ifr_newname);
377
378	case SIOCWANDEV:
379		return dev_siocwandev(dev, &ifr->ifr_settings);
380
381	case SIOCBRADDIF:
382	case SIOCBRDELIF:
383		if (!netif_device_present(dev))
384			return -ENODEV;
385		if (!netif_is_bridge_master(dev))
386			return -EOPNOTSUPP;
387		netdev_hold(dev, &dev_tracker, GFP_KERNEL);
388		rtnl_unlock();
389		err = br_ioctl_call(net, netdev_priv(dev), cmd, ifr, NULL);
390		netdev_put(dev, &dev_tracker);
391		rtnl_lock();
392		return err;
393
394	case SIOCSHWTSTAMP:
395		err = net_hwtstamp_validate(ifr);
396		if (err)
397			return err;
398		fallthrough;
399
400	/*
401	 *	Unknown or private ioctl
402	 */
403	default:
404		if (cmd >= SIOCDEVPRIVATE &&
405		    cmd <= SIOCDEVPRIVATE + 15)
406			return dev_siocdevprivate(dev, ifr, data, cmd);
407
408		if (cmd == SIOCGMIIPHY ||
409		    cmd == SIOCGMIIREG ||
410		    cmd == SIOCSMIIREG ||
411		    cmd == SIOCSHWTSTAMP ||
412		    cmd == SIOCGHWTSTAMP) {
413			err = dev_eth_ioctl(dev, ifr, cmd);
414		} else if (cmd == SIOCBONDENSLAVE ||
415		    cmd == SIOCBONDRELEASE ||
416		    cmd == SIOCBONDSETHWADDR ||
417		    cmd == SIOCBONDSLAVEINFOQUERY ||
418		    cmd == SIOCBONDINFOQUERY ||
419		    cmd == SIOCBONDCHANGEACTIVE) {
420			err = dev_siocbond(dev, ifr, cmd);
 
 
 
 
 
 
 
 
421		} else
422			err = -EINVAL;
423
424	}
425	return err;
426}
427
428/**
429 *	dev_load 	- load a network module
430 *	@net: the applicable net namespace
431 *	@name: name of interface
432 *
433 *	If a network interface is not present and the process has suitable
434 *	privileges this function loads the module. If module loading is not
435 *	available in this kernel then it becomes a nop.
436 */
437
438void dev_load(struct net *net, const char *name)
439{
440	struct net_device *dev;
441	int no_module;
442
443	rcu_read_lock();
444	dev = dev_get_by_name_rcu(net, name);
445	rcu_read_unlock();
446
447	no_module = !dev;
448	if (no_module && capable(CAP_NET_ADMIN))
449		no_module = request_module("netdev-%s", name);
450	if (no_module && capable(CAP_SYS_MODULE))
451		request_module("%s", name);
452}
453EXPORT_SYMBOL(dev_load);
454
455/*
456 *	This function handles all "interface"-type I/O control requests. The actual
457 *	'doing' part of this is dev_ifsioc above.
458 */
459
460/**
461 *	dev_ioctl	-	network device ioctl
462 *	@net: the applicable net namespace
463 *	@cmd: command to issue
464 *	@ifr: pointer to a struct ifreq in user space
465 *	@need_copyout: whether or not copy_to_user() should be called
466 *
467 *	Issue ioctl functions to devices. This is normally called by the
468 *	user space syscall interfaces but can sometimes be useful for
469 *	other purposes. The return value is the return from the syscall if
470 *	positive or a negative errno code on error.
471 */
472
473int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
474	      void __user *data, bool *need_copyout)
475{
476	int ret;
477	char *colon;
478
479	if (need_copyout)
480		*need_copyout = true;
481	if (cmd == SIOCGIFNAME)
482		return dev_ifname(net, ifr);
483
484	ifr->ifr_name[IFNAMSIZ-1] = 0;
485
486	colon = strchr(ifr->ifr_name, ':');
487	if (colon)
488		*colon = 0;
489
490	/*
491	 *	See which interface the caller is talking about.
492	 */
493
494	switch (cmd) {
495	case SIOCGIFHWADDR:
496		dev_load(net, ifr->ifr_name);
497		ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name);
498		if (colon)
499			*colon = ':';
500		return ret;
501	/*
502	 *	These ioctl calls:
503	 *	- can be done by all.
504	 *	- atomic and do not require locking.
505	 *	- return a value
506	 */
507	case SIOCGIFFLAGS:
508	case SIOCGIFMETRIC:
509	case SIOCGIFMTU:
510	case SIOCGIFSLAVE:
511	case SIOCGIFMAP:
512	case SIOCGIFINDEX:
513	case SIOCGIFTXQLEN:
514		dev_load(net, ifr->ifr_name);
515		rcu_read_lock();
516		ret = dev_ifsioc_locked(net, ifr, cmd);
517		rcu_read_unlock();
518		if (colon)
519			*colon = ':';
520		return ret;
521
522	case SIOCETHTOOL:
523		dev_load(net, ifr->ifr_name);
524		ret = dev_ethtool(net, ifr, data);
 
 
525		if (colon)
526			*colon = ':';
527		return ret;
528
529	/*
530	 *	These ioctl calls:
531	 *	- require superuser power.
532	 *	- require strict serialization.
533	 *	- return a value
534	 */
535	case SIOCGMIIPHY:
536	case SIOCGMIIREG:
537	case SIOCSIFNAME:
538		dev_load(net, ifr->ifr_name);
539		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
540			return -EPERM;
541		rtnl_lock();
542		ret = dev_ifsioc(net, ifr, data, cmd);
543		rtnl_unlock();
544		if (colon)
545			*colon = ':';
546		return ret;
547
548	/*
549	 *	These ioctl calls:
550	 *	- require superuser power.
551	 *	- require strict serialization.
552	 *	- do not return a value
553	 */
554	case SIOCSIFMAP:
555	case SIOCSIFTXQLEN:
556		if (!capable(CAP_NET_ADMIN))
557			return -EPERM;
558		fallthrough;
559	/*
560	 *	These ioctl calls:
561	 *	- require local superuser power.
562	 *	- require strict serialization.
563	 *	- do not return a value
564	 */
565	case SIOCSIFFLAGS:
566	case SIOCSIFMETRIC:
567	case SIOCSIFMTU:
568	case SIOCSIFHWADDR:
569	case SIOCSIFSLAVE:
570	case SIOCADDMULTI:
571	case SIOCDELMULTI:
572	case SIOCSIFHWBROADCAST:
573	case SIOCSMIIREG:
574	case SIOCBONDENSLAVE:
575	case SIOCBONDRELEASE:
576	case SIOCBONDSETHWADDR:
577	case SIOCBONDCHANGEACTIVE:
578	case SIOCBRADDIF:
579	case SIOCBRDELIF:
580	case SIOCSHWTSTAMP:
581		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
582			return -EPERM;
583		fallthrough;
584	case SIOCBONDSLAVEINFOQUERY:
585	case SIOCBONDINFOQUERY:
586		dev_load(net, ifr->ifr_name);
587		rtnl_lock();
588		ret = dev_ifsioc(net, ifr, data, cmd);
589		rtnl_unlock();
590		if (need_copyout)
591			*need_copyout = false;
592		return ret;
593
594	case SIOCGIFMEM:
595		/* Get the per device memory space. We can add this but
596		 * currently do not support it */
597	case SIOCSIFMEM:
598		/* Set the per device memory buffer space.
599		 * Not applicable in our case */
600	case SIOCSIFLINK:
601		return -ENOTTY;
602
603	/*
604	 *	Unknown or private ioctl.
605	 */
606	default:
607		if (cmd == SIOCWANDEV ||
608		    cmd == SIOCGHWTSTAMP ||
609		    (cmd >= SIOCDEVPRIVATE &&
610		     cmd <= SIOCDEVPRIVATE + 15)) {
611			dev_load(net, ifr->ifr_name);
612			rtnl_lock();
613			ret = dev_ifsioc(net, ifr, data, cmd);
614			rtnl_unlock();
615			return ret;
616		}
617		return -ENOTTY;
618	}
619}