1 /*
2  * net/core/ethtool.c - Ethtool ioctl handler
3  * Copyright (c) 2003 Matthew Wilcox <matthew@wil.cx>
4  *
5  * This file is where we call all the ethtool_ops commands to get
6  * the information ethtool needs.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  */
13 
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/capability.h>
17 #include <linux/errno.h>
18 #include <linux/ethtool.h>
19 #include <linux/netdevice.h>
20 #include <linux/bitops.h>
21 #include <linux/uaccess.h>
22 #include <linux/vmalloc.h>
23 #include <linux/slab.h>
24 #include <linux/rtnetlink.h>
25 #include <linux/sched.h>
26 
27 /*
28  * Some useful ethtool_ops methods that're device independent.
29  * If we find that all drivers want to do the same thing here,
30  * we can turn these into dev_() function calls.
31  */
32 
ethtool_op_get_link(struct net_device * dev)33 u32 ethtool_op_get_link(struct net_device *dev)
34 {
35 	return netif_carrier_ok(dev) ? 1 : 0;
36 }
37 EXPORT_SYMBOL(ethtool_op_get_link);
38 
39 /* Handlers for each ethtool command */
40 
41 #define ETHTOOL_DEV_FEATURE_WORDS	((NETDEV_FEATURE_COUNT + 31) / 32)
42 
43 static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN] = {
44 	[NETIF_F_SG_BIT] =               "tx-scatter-gather",
45 	[NETIF_F_IP_CSUM_BIT] =          "tx-checksum-ipv4",
46 	[NETIF_F_HW_CSUM_BIT] =          "tx-checksum-ip-generic",
47 	[NETIF_F_IPV6_CSUM_BIT] =        "tx-checksum-ipv6",
48 	[NETIF_F_HIGHDMA_BIT] =          "highdma",
49 	[NETIF_F_FRAGLIST_BIT] =         "tx-scatter-gather-fraglist",
50 	[NETIF_F_HW_VLAN_TX_BIT] =       "tx-vlan-hw-insert",
51 
52 	[NETIF_F_HW_VLAN_RX_BIT] =       "rx-vlan-hw-parse",
53 	[NETIF_F_HW_VLAN_FILTER_BIT] =   "rx-vlan-filter",
54 	[NETIF_F_VLAN_CHALLENGED_BIT] =  "vlan-challenged",
55 	[NETIF_F_GSO_BIT] =              "tx-generic-segmentation",
56 	[NETIF_F_LLTX_BIT] =             "tx-lockless",
57 	[NETIF_F_NETNS_LOCAL_BIT] =      "netns-local",
58 	[NETIF_F_GRO_BIT] =              "rx-gro",
59 	[NETIF_F_LRO_BIT] =              "rx-lro",
60 
61 	[NETIF_F_TSO_BIT] =              "tx-tcp-segmentation",
62 	[NETIF_F_UFO_BIT] =              "tx-udp-fragmentation",
63 	[NETIF_F_GSO_ROBUST_BIT] =       "tx-gso-robust",
64 	[NETIF_F_TSO_ECN_BIT] =          "tx-tcp-ecn-segmentation",
65 	[NETIF_F_TSO6_BIT] =             "tx-tcp6-segmentation",
66 	[NETIF_F_FSO_BIT] =              "tx-fcoe-segmentation",
67 
68 	[NETIF_F_FCOE_CRC_BIT] =         "tx-checksum-fcoe-crc",
69 	[NETIF_F_SCTP_CSUM_BIT] =        "tx-checksum-sctp",
70 	[NETIF_F_FCOE_MTU_BIT] =         "fcoe-mtu",
71 	[NETIF_F_NTUPLE_BIT] =           "rx-ntuple-filter",
72 	[NETIF_F_RXHASH_BIT] =           "rx-hashing",
73 	[NETIF_F_RXCSUM_BIT] =           "rx-checksum",
74 	[NETIF_F_NOCACHE_COPY_BIT] =     "tx-nocache-copy",
75 	[NETIF_F_LOOPBACK_BIT] =         "loopback",
76 };
77 
ethtool_get_features(struct net_device * dev,void __user * useraddr)78 static int ethtool_get_features(struct net_device *dev, void __user *useraddr)
79 {
80 	struct ethtool_gfeatures cmd = {
81 		.cmd = ETHTOOL_GFEATURES,
82 		.size = ETHTOOL_DEV_FEATURE_WORDS,
83 	};
84 	struct ethtool_get_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
85 	u32 __user *sizeaddr;
86 	u32 copy_size;
87 	int i;
88 
89 	/* in case feature bits run out again */
90 	BUILD_BUG_ON(ETHTOOL_DEV_FEATURE_WORDS * sizeof(u32) > sizeof(netdev_features_t));
91 
92 	for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
93 		features[i].available = (u32)(dev->hw_features >> (32 * i));
94 		features[i].requested = (u32)(dev->wanted_features >> (32 * i));
95 		features[i].active = (u32)(dev->features >> (32 * i));
96 		features[i].never_changed =
97 			(u32)(NETIF_F_NEVER_CHANGE >> (32 * i));
98 	}
99 
100 	sizeaddr = useraddr + offsetof(struct ethtool_gfeatures, size);
101 	if (get_user(copy_size, sizeaddr))
102 		return -EFAULT;
103 
104 	if (copy_size > ETHTOOL_DEV_FEATURE_WORDS)
105 		copy_size = ETHTOOL_DEV_FEATURE_WORDS;
106 
107 	if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
108 		return -EFAULT;
109 	useraddr += sizeof(cmd);
110 	if (copy_to_user(useraddr, features, copy_size * sizeof(*features)))
111 		return -EFAULT;
112 
113 	return 0;
114 }
115 
ethtool_set_features(struct net_device * dev,void __user * useraddr)116 static int ethtool_set_features(struct net_device *dev, void __user *useraddr)
117 {
118 	struct ethtool_sfeatures cmd;
119 	struct ethtool_set_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
120 	netdev_features_t wanted = 0, valid = 0;
121 	int i, ret = 0;
122 
123 	if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
124 		return -EFAULT;
125 	useraddr += sizeof(cmd);
126 
127 	if (cmd.size != ETHTOOL_DEV_FEATURE_WORDS)
128 		return -EINVAL;
129 
130 	if (copy_from_user(features, useraddr, sizeof(features)))
131 		return -EFAULT;
132 
133 	for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
134 		valid |= (netdev_features_t)features[i].valid << (32 * i);
135 		wanted |= (netdev_features_t)features[i].requested << (32 * i);
136 	}
137 
138 	if (valid & ~NETIF_F_ETHTOOL_BITS)
139 		return -EINVAL;
140 
141 	if (valid & ~dev->hw_features) {
142 		valid &= dev->hw_features;
143 		ret |= ETHTOOL_F_UNSUPPORTED;
144 	}
145 
146 	dev->wanted_features &= ~valid;
147 	dev->wanted_features |= wanted & valid;
148 	__netdev_update_features(dev);
149 
150 	if ((dev->wanted_features ^ dev->features) & valid)
151 		ret |= ETHTOOL_F_WISH;
152 
153 	return ret;
154 }
155 
__ethtool_get_sset_count(struct net_device * dev,int sset)156 static int __ethtool_get_sset_count(struct net_device *dev, int sset)
157 {
158 	const struct ethtool_ops *ops = dev->ethtool_ops;
159 
160 	if (sset == ETH_SS_FEATURES)
161 		return ARRAY_SIZE(netdev_features_strings);
162 
163 	if (ops && ops->get_sset_count && ops->get_strings)
164 		return ops->get_sset_count(dev, sset);
165 	else
166 		return -EOPNOTSUPP;
167 }
168 
__ethtool_get_strings(struct net_device * dev,u32 stringset,u8 * data)169 static void __ethtool_get_strings(struct net_device *dev,
170 	u32 stringset, u8 *data)
171 {
172 	const struct ethtool_ops *ops = dev->ethtool_ops;
173 
174 	if (stringset == ETH_SS_FEATURES)
175 		memcpy(data, netdev_features_strings,
176 			sizeof(netdev_features_strings));
177 	else
178 		/* ops->get_strings is valid because checked earlier */
179 		ops->get_strings(dev, stringset, data);
180 }
181 
ethtool_get_feature_mask(u32 eth_cmd)182 static netdev_features_t ethtool_get_feature_mask(u32 eth_cmd)
183 {
184 	/* feature masks of legacy discrete ethtool ops */
185 
186 	switch (eth_cmd) {
187 	case ETHTOOL_GTXCSUM:
188 	case ETHTOOL_STXCSUM:
189 		return NETIF_F_ALL_CSUM | NETIF_F_SCTP_CSUM;
190 	case ETHTOOL_GRXCSUM:
191 	case ETHTOOL_SRXCSUM:
192 		return NETIF_F_RXCSUM;
193 	case ETHTOOL_GSG:
194 	case ETHTOOL_SSG:
195 		return NETIF_F_SG;
196 	case ETHTOOL_GTSO:
197 	case ETHTOOL_STSO:
198 		return NETIF_F_ALL_TSO;
199 	case ETHTOOL_GUFO:
200 	case ETHTOOL_SUFO:
201 		return NETIF_F_UFO;
202 	case ETHTOOL_GGSO:
203 	case ETHTOOL_SGSO:
204 		return NETIF_F_GSO;
205 	case ETHTOOL_GGRO:
206 	case ETHTOOL_SGRO:
207 		return NETIF_F_GRO;
208 	default:
209 		BUG();
210 	}
211 }
212 
ethtool_get_one_feature(struct net_device * dev,char __user * useraddr,u32 ethcmd)213 static int ethtool_get_one_feature(struct net_device *dev,
214 	char __user *useraddr, u32 ethcmd)
215 {
216 	netdev_features_t mask = ethtool_get_feature_mask(ethcmd);
217 	struct ethtool_value edata = {
218 		.cmd = ethcmd,
219 		.data = !!(dev->features & mask),
220 	};
221 
222 	if (copy_to_user(useraddr, &edata, sizeof(edata)))
223 		return -EFAULT;
224 	return 0;
225 }
226 
ethtool_set_one_feature(struct net_device * dev,void __user * useraddr,u32 ethcmd)227 static int ethtool_set_one_feature(struct net_device *dev,
228 	void __user *useraddr, u32 ethcmd)
229 {
230 	struct ethtool_value edata;
231 	netdev_features_t mask;
232 
233 	if (copy_from_user(&edata, useraddr, sizeof(edata)))
234 		return -EFAULT;
235 
236 	mask = ethtool_get_feature_mask(ethcmd);
237 	mask &= dev->hw_features;
238 	if (!mask)
239 		return -EOPNOTSUPP;
240 
241 	if (edata.data)
242 		dev->wanted_features |= mask;
243 	else
244 		dev->wanted_features &= ~mask;
245 
246 	__netdev_update_features(dev);
247 
248 	return 0;
249 }
250 
251 #define ETH_ALL_FLAGS    (ETH_FLAG_LRO | ETH_FLAG_RXVLAN | ETH_FLAG_TXVLAN | \
252 			  ETH_FLAG_NTUPLE | ETH_FLAG_RXHASH)
253 #define ETH_ALL_FEATURES (NETIF_F_LRO | NETIF_F_HW_VLAN_RX | \
254 			  NETIF_F_HW_VLAN_TX | NETIF_F_NTUPLE | NETIF_F_RXHASH)
255 
__ethtool_get_flags(struct net_device * dev)256 static u32 __ethtool_get_flags(struct net_device *dev)
257 {
258 	u32 flags = 0;
259 
260 	if (dev->features & NETIF_F_LRO)	flags |= ETH_FLAG_LRO;
261 	if (dev->features & NETIF_F_HW_VLAN_RX)	flags |= ETH_FLAG_RXVLAN;
262 	if (dev->features & NETIF_F_HW_VLAN_TX)	flags |= ETH_FLAG_TXVLAN;
263 	if (dev->features & NETIF_F_NTUPLE)	flags |= ETH_FLAG_NTUPLE;
264 	if (dev->features & NETIF_F_RXHASH)	flags |= ETH_FLAG_RXHASH;
265 
266 	return flags;
267 }
268 
__ethtool_set_flags(struct net_device * dev,u32 data)269 static int __ethtool_set_flags(struct net_device *dev, u32 data)
270 {
271 	netdev_features_t features = 0, changed;
272 
273 	if (data & ~ETH_ALL_FLAGS)
274 		return -EINVAL;
275 
276 	if (data & ETH_FLAG_LRO)	features |= NETIF_F_LRO;
277 	if (data & ETH_FLAG_RXVLAN)	features |= NETIF_F_HW_VLAN_RX;
278 	if (data & ETH_FLAG_TXVLAN)	features |= NETIF_F_HW_VLAN_TX;
279 	if (data & ETH_FLAG_NTUPLE)	features |= NETIF_F_NTUPLE;
280 	if (data & ETH_FLAG_RXHASH)	features |= NETIF_F_RXHASH;
281 
282 	/* allow changing only bits set in hw_features */
283 	changed = (features ^ dev->features) & ETH_ALL_FEATURES;
284 	if (changed & ~dev->hw_features)
285 		return (changed & dev->hw_features) ? -EINVAL : -EOPNOTSUPP;
286 
287 	dev->wanted_features =
288 		(dev->wanted_features & ~changed) | (features & changed);
289 
290 	__netdev_update_features(dev);
291 
292 	return 0;
293 }
294 
__ethtool_get_settings(struct net_device * dev,struct ethtool_cmd * cmd)295 int __ethtool_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
296 {
297 	ASSERT_RTNL();
298 
299 	if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings)
300 		return -EOPNOTSUPP;
301 
302 	memset(cmd, 0, sizeof(struct ethtool_cmd));
303 	cmd->cmd = ETHTOOL_GSET;
304 	return dev->ethtool_ops->get_settings(dev, cmd);
305 }
306 EXPORT_SYMBOL(__ethtool_get_settings);
307 
ethtool_get_settings(struct net_device * dev,void __user * useraddr)308 static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
309 {
310 	int err;
311 	struct ethtool_cmd cmd;
312 
313 	err = __ethtool_get_settings(dev, &cmd);
314 	if (err < 0)
315 		return err;
316 
317 	if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
318 		return -EFAULT;
319 	return 0;
320 }
321 
ethtool_set_settings(struct net_device * dev,void __user * useraddr)322 static int ethtool_set_settings(struct net_device *dev, void __user *useraddr)
323 {
324 	struct ethtool_cmd cmd;
325 
326 	if (!dev->ethtool_ops->set_settings)
327 		return -EOPNOTSUPP;
328 
329 	if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
330 		return -EFAULT;
331 
332 	return dev->ethtool_ops->set_settings(dev, &cmd);
333 }
334 
ethtool_get_drvinfo(struct net_device * dev,void __user * useraddr)335 static noinline_for_stack int ethtool_get_drvinfo(struct net_device *dev,
336 						  void __user *useraddr)
337 {
338 	struct ethtool_drvinfo info;
339 	const struct ethtool_ops *ops = dev->ethtool_ops;
340 
341 	memset(&info, 0, sizeof(info));
342 	info.cmd = ETHTOOL_GDRVINFO;
343 	if (ops && ops->get_drvinfo) {
344 		ops->get_drvinfo(dev, &info);
345 	} else if (dev->dev.parent && dev->dev.parent->driver) {
346 		strlcpy(info.bus_info, dev_name(dev->dev.parent),
347 			sizeof(info.bus_info));
348 		strlcpy(info.driver, dev->dev.parent->driver->name,
349 			sizeof(info.driver));
350 	} else {
351 		return -EOPNOTSUPP;
352 	}
353 
354 	/*
355 	 * this method of obtaining string set info is deprecated;
356 	 * Use ETHTOOL_GSSET_INFO instead.
357 	 */
358 	if (ops && ops->get_sset_count) {
359 		int rc;
360 
361 		rc = ops->get_sset_count(dev, ETH_SS_TEST);
362 		if (rc >= 0)
363 			info.testinfo_len = rc;
364 		rc = ops->get_sset_count(dev, ETH_SS_STATS);
365 		if (rc >= 0)
366 			info.n_stats = rc;
367 		rc = ops->get_sset_count(dev, ETH_SS_PRIV_FLAGS);
368 		if (rc >= 0)
369 			info.n_priv_flags = rc;
370 	}
371 	if (ops && ops->get_regs_len)
372 		info.regdump_len = ops->get_regs_len(dev);
373 	if (ops && ops->get_eeprom_len)
374 		info.eedump_len = ops->get_eeprom_len(dev);
375 
376 	if (copy_to_user(useraddr, &info, sizeof(info)))
377 		return -EFAULT;
378 	return 0;
379 }
380 
ethtool_get_sset_info(struct net_device * dev,void __user * useraddr)381 static noinline_for_stack int ethtool_get_sset_info(struct net_device *dev,
382 						    void __user *useraddr)
383 {
384 	struct ethtool_sset_info info;
385 	u64 sset_mask;
386 	int i, idx = 0, n_bits = 0, ret, rc;
387 	u32 *info_buf = NULL;
388 
389 	if (copy_from_user(&info, useraddr, sizeof(info)))
390 		return -EFAULT;
391 
392 	/* store copy of mask, because we zero struct later on */
393 	sset_mask = info.sset_mask;
394 	if (!sset_mask)
395 		return 0;
396 
397 	/* calculate size of return buffer */
398 	n_bits = hweight64(sset_mask);
399 
400 	memset(&info, 0, sizeof(info));
401 	info.cmd = ETHTOOL_GSSET_INFO;
402 
403 	info_buf = kzalloc(n_bits * sizeof(u32), GFP_USER);
404 	if (!info_buf)
405 		return -ENOMEM;
406 
407 	/*
408 	 * fill return buffer based on input bitmask and successful
409 	 * get_sset_count return
410 	 */
411 	for (i = 0; i < 64; i++) {
412 		if (!(sset_mask & (1ULL << i)))
413 			continue;
414 
415 		rc = __ethtool_get_sset_count(dev, i);
416 		if (rc >= 0) {
417 			info.sset_mask |= (1ULL << i);
418 			info_buf[idx++] = rc;
419 		}
420 	}
421 
422 	ret = -EFAULT;
423 	if (copy_to_user(useraddr, &info, sizeof(info)))
424 		goto out;
425 
426 	useraddr += offsetof(struct ethtool_sset_info, data);
427 	if (copy_to_user(useraddr, info_buf, idx * sizeof(u32)))
428 		goto out;
429 
430 	ret = 0;
431 
432 out:
433 	kfree(info_buf);
434 	return ret;
435 }
436 
ethtool_set_rxnfc(struct net_device * dev,u32 cmd,void __user * useraddr)437 static noinline_for_stack int ethtool_set_rxnfc(struct net_device *dev,
438 						u32 cmd, void __user *useraddr)
439 {
440 	struct ethtool_rxnfc info;
441 	size_t info_size = sizeof(info);
442 	int rc;
443 
444 	if (!dev->ethtool_ops->set_rxnfc)
445 		return -EOPNOTSUPP;
446 
447 	/* struct ethtool_rxnfc was originally defined for
448 	 * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
449 	 * members.  User-space might still be using that
450 	 * definition. */
451 	if (cmd == ETHTOOL_SRXFH)
452 		info_size = (offsetof(struct ethtool_rxnfc, data) +
453 			     sizeof(info.data));
454 
455 	if (copy_from_user(&info, useraddr, info_size))
456 		return -EFAULT;
457 
458 	rc = dev->ethtool_ops->set_rxnfc(dev, &info);
459 	if (rc)
460 		return rc;
461 
462 	if (cmd == ETHTOOL_SRXCLSRLINS &&
463 	    copy_to_user(useraddr, &info, info_size))
464 		return -EFAULT;
465 
466 	return 0;
467 }
468 
ethtool_get_rxnfc(struct net_device * dev,u32 cmd,void __user * useraddr)469 static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,
470 						u32 cmd, void __user *useraddr)
471 {
472 	struct ethtool_rxnfc info;
473 	size_t info_size = sizeof(info);
474 	const struct ethtool_ops *ops = dev->ethtool_ops;
475 	int ret;
476 	void *rule_buf = NULL;
477 
478 	if (!ops->get_rxnfc)
479 		return -EOPNOTSUPP;
480 
481 	/* struct ethtool_rxnfc was originally defined for
482 	 * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
483 	 * members.  User-space might still be using that
484 	 * definition. */
485 	if (cmd == ETHTOOL_GRXFH)
486 		info_size = (offsetof(struct ethtool_rxnfc, data) +
487 			     sizeof(info.data));
488 
489 	if (copy_from_user(&info, useraddr, info_size))
490 		return -EFAULT;
491 
492 	if (info.cmd == ETHTOOL_GRXCLSRLALL) {
493 		if (info.rule_cnt > 0) {
494 			if (info.rule_cnt <= KMALLOC_MAX_SIZE / sizeof(u32))
495 				rule_buf = kzalloc(info.rule_cnt * sizeof(u32),
496 						   GFP_USER);
497 			if (!rule_buf)
498 				return -ENOMEM;
499 		}
500 	}
501 
502 	ret = ops->get_rxnfc(dev, &info, rule_buf);
503 	if (ret < 0)
504 		goto err_out;
505 
506 	ret = -EFAULT;
507 	if (copy_to_user(useraddr, &info, info_size))
508 		goto err_out;
509 
510 	if (rule_buf) {
511 		useraddr += offsetof(struct ethtool_rxnfc, rule_locs);
512 		if (copy_to_user(useraddr, rule_buf,
513 				 info.rule_cnt * sizeof(u32)))
514 			goto err_out;
515 	}
516 	ret = 0;
517 
518 err_out:
519 	kfree(rule_buf);
520 
521 	return ret;
522 }
523 
ethtool_get_rxfh_indir(struct net_device * dev,void __user * useraddr)524 static noinline_for_stack int ethtool_get_rxfh_indir(struct net_device *dev,
525 						     void __user *useraddr)
526 {
527 	u32 user_size, dev_size;
528 	u32 *indir;
529 	int ret;
530 
531 	if (!dev->ethtool_ops->get_rxfh_indir_size ||
532 	    !dev->ethtool_ops->get_rxfh_indir)
533 		return -EOPNOTSUPP;
534 	dev_size = dev->ethtool_ops->get_rxfh_indir_size(dev);
535 	if (dev_size == 0)
536 		return -EOPNOTSUPP;
537 
538 	if (copy_from_user(&user_size,
539 			   useraddr + offsetof(struct ethtool_rxfh_indir, size),
540 			   sizeof(user_size)))
541 		return -EFAULT;
542 
543 	if (copy_to_user(useraddr + offsetof(struct ethtool_rxfh_indir, size),
544 			 &dev_size, sizeof(dev_size)))
545 		return -EFAULT;
546 
547 	/* If the user buffer size is 0, this is just a query for the
548 	 * device table size.  Otherwise, if it's smaller than the
549 	 * device table size it's an error.
550 	 */
551 	if (user_size < dev_size)
552 		return user_size == 0 ? 0 : -EINVAL;
553 
554 	indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
555 	if (!indir)
556 		return -ENOMEM;
557 
558 	ret = dev->ethtool_ops->get_rxfh_indir(dev, indir);
559 	if (ret)
560 		goto out;
561 
562 	if (copy_to_user(useraddr +
563 			 offsetof(struct ethtool_rxfh_indir, ring_index[0]),
564 			 indir, dev_size * sizeof(indir[0])))
565 		ret = -EFAULT;
566 
567 out:
568 	kfree(indir);
569 	return ret;
570 }
571 
ethtool_set_rxfh_indir(struct net_device * dev,void __user * useraddr)572 static noinline_for_stack int ethtool_set_rxfh_indir(struct net_device *dev,
573 						     void __user *useraddr)
574 {
575 	struct ethtool_rxnfc rx_rings;
576 	u32 user_size, dev_size, i;
577 	u32 *indir;
578 	int ret;
579 
580 	if (!dev->ethtool_ops->get_rxfh_indir_size ||
581 	    !dev->ethtool_ops->set_rxfh_indir ||
582 	    !dev->ethtool_ops->get_rxnfc)
583 		return -EOPNOTSUPP;
584 	dev_size = dev->ethtool_ops->get_rxfh_indir_size(dev);
585 	if (dev_size == 0)
586 		return -EOPNOTSUPP;
587 
588 	if (copy_from_user(&user_size,
589 			   useraddr + offsetof(struct ethtool_rxfh_indir, size),
590 			   sizeof(user_size)))
591 		return -EFAULT;
592 
593 	if (user_size != 0 && user_size != dev_size)
594 		return -EINVAL;
595 
596 	indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
597 	if (!indir)
598 		return -ENOMEM;
599 
600 	rx_rings.cmd = ETHTOOL_GRXRINGS;
601 	ret = dev->ethtool_ops->get_rxnfc(dev, &rx_rings, NULL);
602 	if (ret)
603 		goto out;
604 
605 	if (user_size == 0) {
606 		for (i = 0; i < dev_size; i++)
607 			indir[i] = ethtool_rxfh_indir_default(i, rx_rings.data);
608 	} else {
609 		if (copy_from_user(indir,
610 				  useraddr +
611 				  offsetof(struct ethtool_rxfh_indir,
612 					   ring_index[0]),
613 				  dev_size * sizeof(indir[0]))) {
614 			ret = -EFAULT;
615 			goto out;
616 		}
617 
618 		/* Validate ring indices */
619 		for (i = 0; i < dev_size; i++) {
620 			if (indir[i] >= rx_rings.data) {
621 				ret = -EINVAL;
622 				goto out;
623 			}
624 		}
625 	}
626 
627 	ret = dev->ethtool_ops->set_rxfh_indir(dev, indir);
628 
629 out:
630 	kfree(indir);
631 	return ret;
632 }
633 
ethtool_get_regs(struct net_device * dev,char __user * useraddr)634 static int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
635 {
636 	struct ethtool_regs regs;
637 	const struct ethtool_ops *ops = dev->ethtool_ops;
638 	void *regbuf;
639 	int reglen, ret;
640 
641 	if (!ops->get_regs || !ops->get_regs_len)
642 		return -EOPNOTSUPP;
643 
644 	if (copy_from_user(&regs, useraddr, sizeof(regs)))
645 		return -EFAULT;
646 
647 	reglen = ops->get_regs_len(dev);
648 	if (regs.len > reglen)
649 		regs.len = reglen;
650 
651 	regbuf = vzalloc(reglen);
652 	if (reglen && !regbuf)
653 		return -ENOMEM;
654 
655 	ops->get_regs(dev, &regs, regbuf);
656 
657 	ret = -EFAULT;
658 	if (copy_to_user(useraddr, &regs, sizeof(regs)))
659 		goto out;
660 	useraddr += offsetof(struct ethtool_regs, data);
661 	if (regbuf && copy_to_user(useraddr, regbuf, regs.len))
662 		goto out;
663 	ret = 0;
664 
665  out:
666 	vfree(regbuf);
667 	return ret;
668 }
669 
ethtool_reset(struct net_device * dev,char __user * useraddr)670 static int ethtool_reset(struct net_device *dev, char __user *useraddr)
671 {
672 	struct ethtool_value reset;
673 	int ret;
674 
675 	if (!dev->ethtool_ops->reset)
676 		return -EOPNOTSUPP;
677 
678 	if (copy_from_user(&reset, useraddr, sizeof(reset)))
679 		return -EFAULT;
680 
681 	ret = dev->ethtool_ops->reset(dev, &reset.data);
682 	if (ret)
683 		return ret;
684 
685 	if (copy_to_user(useraddr, &reset, sizeof(reset)))
686 		return -EFAULT;
687 	return 0;
688 }
689 
ethtool_get_wol(struct net_device * dev,char __user * useraddr)690 static int ethtool_get_wol(struct net_device *dev, char __user *useraddr)
691 {
692 	struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
693 
694 	if (!dev->ethtool_ops->get_wol)
695 		return -EOPNOTSUPP;
696 
697 	dev->ethtool_ops->get_wol(dev, &wol);
698 
699 	if (copy_to_user(useraddr, &wol, sizeof(wol)))
700 		return -EFAULT;
701 	return 0;
702 }
703 
ethtool_set_wol(struct net_device * dev,char __user * useraddr)704 static int ethtool_set_wol(struct net_device *dev, char __user *useraddr)
705 {
706 	struct ethtool_wolinfo wol;
707 
708 	if (!dev->ethtool_ops->set_wol)
709 		return -EOPNOTSUPP;
710 
711 	if (copy_from_user(&wol, useraddr, sizeof(wol)))
712 		return -EFAULT;
713 
714 	return dev->ethtool_ops->set_wol(dev, &wol);
715 }
716 
ethtool_nway_reset(struct net_device * dev)717 static int ethtool_nway_reset(struct net_device *dev)
718 {
719 	if (!dev->ethtool_ops->nway_reset)
720 		return -EOPNOTSUPP;
721 
722 	return dev->ethtool_ops->nway_reset(dev);
723 }
724 
ethtool_get_link(struct net_device * dev,char __user * useraddr)725 static int ethtool_get_link(struct net_device *dev, char __user *useraddr)
726 {
727 	struct ethtool_value edata = { .cmd = ETHTOOL_GLINK };
728 
729 	if (!dev->ethtool_ops->get_link)
730 		return -EOPNOTSUPP;
731 
732 	edata.data = netif_running(dev) && dev->ethtool_ops->get_link(dev);
733 
734 	if (copy_to_user(useraddr, &edata, sizeof(edata)))
735 		return -EFAULT;
736 	return 0;
737 }
738 
ethtool_get_eeprom(struct net_device * dev,void __user * useraddr)739 static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
740 {
741 	struct ethtool_eeprom eeprom;
742 	const struct ethtool_ops *ops = dev->ethtool_ops;
743 	void __user *userbuf = useraddr + sizeof(eeprom);
744 	u32 bytes_remaining;
745 	u8 *data;
746 	int ret = 0;
747 
748 	if (!ops->get_eeprom || !ops->get_eeprom_len)
749 		return -EOPNOTSUPP;
750 
751 	if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
752 		return -EFAULT;
753 
754 	/* Check for wrap and zero */
755 	if (eeprom.offset + eeprom.len <= eeprom.offset)
756 		return -EINVAL;
757 
758 	/* Check for exceeding total eeprom len */
759 	if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
760 		return -EINVAL;
761 
762 	data = kmalloc(PAGE_SIZE, GFP_USER);
763 	if (!data)
764 		return -ENOMEM;
765 
766 	bytes_remaining = eeprom.len;
767 	while (bytes_remaining > 0) {
768 		eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);
769 
770 		ret = ops->get_eeprom(dev, &eeprom, data);
771 		if (ret)
772 			break;
773 		if (copy_to_user(userbuf, data, eeprom.len)) {
774 			ret = -EFAULT;
775 			break;
776 		}
777 		userbuf += eeprom.len;
778 		eeprom.offset += eeprom.len;
779 		bytes_remaining -= eeprom.len;
780 	}
781 
782 	eeprom.len = userbuf - (useraddr + sizeof(eeprom));
783 	eeprom.offset -= eeprom.len;
784 	if (copy_to_user(useraddr, &eeprom, sizeof(eeprom)))
785 		ret = -EFAULT;
786 
787 	kfree(data);
788 	return ret;
789 }
790 
ethtool_set_eeprom(struct net_device * dev,void __user * useraddr)791 static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
792 {
793 	struct ethtool_eeprom eeprom;
794 	const struct ethtool_ops *ops = dev->ethtool_ops;
795 	void __user *userbuf = useraddr + sizeof(eeprom);
796 	u32 bytes_remaining;
797 	u8 *data;
798 	int ret = 0;
799 
800 	if (!ops->set_eeprom || !ops->get_eeprom_len)
801 		return -EOPNOTSUPP;
802 
803 	if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
804 		return -EFAULT;
805 
806 	/* Check for wrap and zero */
807 	if (eeprom.offset + eeprom.len <= eeprom.offset)
808 		return -EINVAL;
809 
810 	/* Check for exceeding total eeprom len */
811 	if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
812 		return -EINVAL;
813 
814 	data = kmalloc(PAGE_SIZE, GFP_USER);
815 	if (!data)
816 		return -ENOMEM;
817 
818 	bytes_remaining = eeprom.len;
819 	while (bytes_remaining > 0) {
820 		eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);
821 
822 		if (copy_from_user(data, userbuf, eeprom.len)) {
823 			ret = -EFAULT;
824 			break;
825 		}
826 		ret = ops->set_eeprom(dev, &eeprom, data);
827 		if (ret)
828 			break;
829 		userbuf += eeprom.len;
830 		eeprom.offset += eeprom.len;
831 		bytes_remaining -= eeprom.len;
832 	}
833 
834 	kfree(data);
835 	return ret;
836 }
837 
ethtool_get_coalesce(struct net_device * dev,void __user * useraddr)838 static noinline_for_stack int ethtool_get_coalesce(struct net_device *dev,
839 						   void __user *useraddr)
840 {
841 	struct ethtool_coalesce coalesce = { .cmd = ETHTOOL_GCOALESCE };
842 
843 	if (!dev->ethtool_ops->get_coalesce)
844 		return -EOPNOTSUPP;
845 
846 	dev->ethtool_ops->get_coalesce(dev, &coalesce);
847 
848 	if (copy_to_user(useraddr, &coalesce, sizeof(coalesce)))
849 		return -EFAULT;
850 	return 0;
851 }
852 
ethtool_set_coalesce(struct net_device * dev,void __user * useraddr)853 static noinline_for_stack int ethtool_set_coalesce(struct net_device *dev,
854 						   void __user *useraddr)
855 {
856 	struct ethtool_coalesce coalesce;
857 
858 	if (!dev->ethtool_ops->set_coalesce)
859 		return -EOPNOTSUPP;
860 
861 	if (copy_from_user(&coalesce, useraddr, sizeof(coalesce)))
862 		return -EFAULT;
863 
864 	return dev->ethtool_ops->set_coalesce(dev, &coalesce);
865 }
866 
ethtool_get_ringparam(struct net_device * dev,void __user * useraddr)867 static int ethtool_get_ringparam(struct net_device *dev, void __user *useraddr)
868 {
869 	struct ethtool_ringparam ringparam = { .cmd = ETHTOOL_GRINGPARAM };
870 
871 	if (!dev->ethtool_ops->get_ringparam)
872 		return -EOPNOTSUPP;
873 
874 	dev->ethtool_ops->get_ringparam(dev, &ringparam);
875 
876 	if (copy_to_user(useraddr, &ringparam, sizeof(ringparam)))
877 		return -EFAULT;
878 	return 0;
879 }
880 
ethtool_set_ringparam(struct net_device * dev,void __user * useraddr)881 static int ethtool_set_ringparam(struct net_device *dev, void __user *useraddr)
882 {
883 	struct ethtool_ringparam ringparam;
884 
885 	if (!dev->ethtool_ops->set_ringparam)
886 		return -EOPNOTSUPP;
887 
888 	if (copy_from_user(&ringparam, useraddr, sizeof(ringparam)))
889 		return -EFAULT;
890 
891 	return dev->ethtool_ops->set_ringparam(dev, &ringparam);
892 }
893 
ethtool_get_channels(struct net_device * dev,void __user * useraddr)894 static noinline_for_stack int ethtool_get_channels(struct net_device *dev,
895 						   void __user *useraddr)
896 {
897 	struct ethtool_channels channels = { .cmd = ETHTOOL_GCHANNELS };
898 
899 	if (!dev->ethtool_ops->get_channels)
900 		return -EOPNOTSUPP;
901 
902 	dev->ethtool_ops->get_channels(dev, &channels);
903 
904 	if (copy_to_user(useraddr, &channels, sizeof(channels)))
905 		return -EFAULT;
906 	return 0;
907 }
908 
ethtool_set_channels(struct net_device * dev,void __user * useraddr)909 static noinline_for_stack int ethtool_set_channels(struct net_device *dev,
910 						   void __user *useraddr)
911 {
912 	struct ethtool_channels channels;
913 
914 	if (!dev->ethtool_ops->set_channels)
915 		return -EOPNOTSUPP;
916 
917 	if (copy_from_user(&channels, useraddr, sizeof(channels)))
918 		return -EFAULT;
919 
920 	return dev->ethtool_ops->set_channels(dev, &channels);
921 }
922 
ethtool_get_pauseparam(struct net_device * dev,void __user * useraddr)923 static int ethtool_get_pauseparam(struct net_device *dev, void __user *useraddr)
924 {
925 	struct ethtool_pauseparam pauseparam = { ETHTOOL_GPAUSEPARAM };
926 
927 	if (!dev->ethtool_ops->get_pauseparam)
928 		return -EOPNOTSUPP;
929 
930 	dev->ethtool_ops->get_pauseparam(dev, &pauseparam);
931 
932 	if (copy_to_user(useraddr, &pauseparam, sizeof(pauseparam)))
933 		return -EFAULT;
934 	return 0;
935 }
936 
ethtool_set_pauseparam(struct net_device * dev,void __user * useraddr)937 static int ethtool_set_pauseparam(struct net_device *dev, void __user *useraddr)
938 {
939 	struct ethtool_pauseparam pauseparam;
940 
941 	if (!dev->ethtool_ops->set_pauseparam)
942 		return -EOPNOTSUPP;
943 
944 	if (copy_from_user(&pauseparam, useraddr, sizeof(pauseparam)))
945 		return -EFAULT;
946 
947 	return dev->ethtool_ops->set_pauseparam(dev, &pauseparam);
948 }
949 
ethtool_self_test(struct net_device * dev,char __user * useraddr)950 static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
951 {
952 	struct ethtool_test test;
953 	const struct ethtool_ops *ops = dev->ethtool_ops;
954 	u64 *data;
955 	int ret, test_len;
956 
957 	if (!ops->self_test || !ops->get_sset_count)
958 		return -EOPNOTSUPP;
959 
960 	test_len = ops->get_sset_count(dev, ETH_SS_TEST);
961 	if (test_len < 0)
962 		return test_len;
963 	WARN_ON(test_len == 0);
964 
965 	if (copy_from_user(&test, useraddr, sizeof(test)))
966 		return -EFAULT;
967 
968 	test.len = test_len;
969 	data = kmalloc(test_len * sizeof(u64), GFP_USER);
970 	if (!data)
971 		return -ENOMEM;
972 
973 	ops->self_test(dev, &test, data);
974 
975 	ret = -EFAULT;
976 	if (copy_to_user(useraddr, &test, sizeof(test)))
977 		goto out;
978 	useraddr += sizeof(test);
979 	if (copy_to_user(useraddr, data, test.len * sizeof(u64)))
980 		goto out;
981 	ret = 0;
982 
983  out:
984 	kfree(data);
985 	return ret;
986 }
987 
ethtool_get_strings(struct net_device * dev,void __user * useraddr)988 static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
989 {
990 	struct ethtool_gstrings gstrings;
991 	u8 *data;
992 	int ret;
993 
994 	if (copy_from_user(&gstrings, useraddr, sizeof(gstrings)))
995 		return -EFAULT;
996 
997 	ret = __ethtool_get_sset_count(dev, gstrings.string_set);
998 	if (ret < 0)
999 		return ret;
1000 
1001 	gstrings.len = ret;
1002 
1003 	data = kmalloc(gstrings.len * ETH_GSTRING_LEN, GFP_USER);
1004 	if (!data)
1005 		return -ENOMEM;
1006 
1007 	__ethtool_get_strings(dev, gstrings.string_set, data);
1008 
1009 	ret = -EFAULT;
1010 	if (copy_to_user(useraddr, &gstrings, sizeof(gstrings)))
1011 		goto out;
1012 	useraddr += sizeof(gstrings);
1013 	if (copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))
1014 		goto out;
1015 	ret = 0;
1016 
1017 out:
1018 	kfree(data);
1019 	return ret;
1020 }
1021 
ethtool_phys_id(struct net_device * dev,void __user * useraddr)1022 static int ethtool_phys_id(struct net_device *dev, void __user *useraddr)
1023 {
1024 	struct ethtool_value id;
1025 	static bool busy;
1026 	int rc;
1027 
1028 	if (!dev->ethtool_ops->set_phys_id)
1029 		return -EOPNOTSUPP;
1030 
1031 	if (busy)
1032 		return -EBUSY;
1033 
1034 	if (copy_from_user(&id, useraddr, sizeof(id)))
1035 		return -EFAULT;
1036 
1037 	rc = dev->ethtool_ops->set_phys_id(dev, ETHTOOL_ID_ACTIVE);
1038 	if (rc < 0)
1039 		return rc;
1040 
1041 	/* Drop the RTNL lock while waiting, but prevent reentry or
1042 	 * removal of the device.
1043 	 */
1044 	busy = true;
1045 	dev_hold(dev);
1046 	rtnl_unlock();
1047 
1048 	if (rc == 0) {
1049 		/* Driver will handle this itself */
1050 		schedule_timeout_interruptible(
1051 			id.data ? (id.data * HZ) : MAX_SCHEDULE_TIMEOUT);
1052 	} else {
1053 		/* Driver expects to be called at twice the frequency in rc */
1054 		int n = rc * 2, i, interval = HZ / n;
1055 
1056 		/* Count down seconds */
1057 		do {
1058 			/* Count down iterations per second */
1059 			i = n;
1060 			do {
1061 				rtnl_lock();
1062 				rc = dev->ethtool_ops->set_phys_id(dev,
1063 				    (i & 1) ? ETHTOOL_ID_OFF : ETHTOOL_ID_ON);
1064 				rtnl_unlock();
1065 				if (rc)
1066 					break;
1067 				schedule_timeout_interruptible(interval);
1068 			} while (!signal_pending(current) && --i != 0);
1069 		} while (!signal_pending(current) &&
1070 			 (id.data == 0 || --id.data != 0));
1071 	}
1072 
1073 	rtnl_lock();
1074 	dev_put(dev);
1075 	busy = false;
1076 
1077 	(void)dev->ethtool_ops->set_phys_id(dev, ETHTOOL_ID_INACTIVE);
1078 	return rc;
1079 }
1080 
ethtool_get_stats(struct net_device * dev,void __user * useraddr)1081 static int ethtool_get_stats(struct net_device *dev, void __user *useraddr)
1082 {
1083 	struct ethtool_stats stats;
1084 	const struct ethtool_ops *ops = dev->ethtool_ops;
1085 	u64 *data;
1086 	int ret, n_stats;
1087 
1088 	if (!ops->get_ethtool_stats || !ops->get_sset_count)
1089 		return -EOPNOTSUPP;
1090 
1091 	n_stats = ops->get_sset_count(dev, ETH_SS_STATS);
1092 	if (n_stats < 0)
1093 		return n_stats;
1094 	WARN_ON(n_stats == 0);
1095 
1096 	if (copy_from_user(&stats, useraddr, sizeof(stats)))
1097 		return -EFAULT;
1098 
1099 	stats.n_stats = n_stats;
1100 	data = kmalloc(n_stats * sizeof(u64), GFP_USER);
1101 	if (!data)
1102 		return -ENOMEM;
1103 
1104 	ops->get_ethtool_stats(dev, &stats, data);
1105 
1106 	ret = -EFAULT;
1107 	if (copy_to_user(useraddr, &stats, sizeof(stats)))
1108 		goto out;
1109 	useraddr += sizeof(stats);
1110 	if (copy_to_user(useraddr, data, stats.n_stats * sizeof(u64)))
1111 		goto out;
1112 	ret = 0;
1113 
1114  out:
1115 	kfree(data);
1116 	return ret;
1117 }
1118 
ethtool_get_perm_addr(struct net_device * dev,void __user * useraddr)1119 static int ethtool_get_perm_addr(struct net_device *dev, void __user *useraddr)
1120 {
1121 	struct ethtool_perm_addr epaddr;
1122 
1123 	if (copy_from_user(&epaddr, useraddr, sizeof(epaddr)))
1124 		return -EFAULT;
1125 
1126 	if (epaddr.size < dev->addr_len)
1127 		return -ETOOSMALL;
1128 	epaddr.size = dev->addr_len;
1129 
1130 	if (copy_to_user(useraddr, &epaddr, sizeof(epaddr)))
1131 		return -EFAULT;
1132 	useraddr += sizeof(epaddr);
1133 	if (copy_to_user(useraddr, dev->perm_addr, epaddr.size))
1134 		return -EFAULT;
1135 	return 0;
1136 }
1137 
ethtool_get_value(struct net_device * dev,char __user * useraddr,u32 cmd,u32 (* actor)(struct net_device *))1138 static int ethtool_get_value(struct net_device *dev, char __user *useraddr,
1139 			     u32 cmd, u32 (*actor)(struct net_device *))
1140 {
1141 	struct ethtool_value edata = { .cmd = cmd };
1142 
1143 	if (!actor)
1144 		return -EOPNOTSUPP;
1145 
1146 	edata.data = actor(dev);
1147 
1148 	if (copy_to_user(useraddr, &edata, sizeof(edata)))
1149 		return -EFAULT;
1150 	return 0;
1151 }
1152 
ethtool_set_value_void(struct net_device * dev,char __user * useraddr,void (* actor)(struct net_device *,u32))1153 static int ethtool_set_value_void(struct net_device *dev, char __user *useraddr,
1154 			     void (*actor)(struct net_device *, u32))
1155 {
1156 	struct ethtool_value edata;
1157 
1158 	if (!actor)
1159 		return -EOPNOTSUPP;
1160 
1161 	if (copy_from_user(&edata, useraddr, sizeof(edata)))
1162 		return -EFAULT;
1163 
1164 	actor(dev, edata.data);
1165 	return 0;
1166 }
1167 
ethtool_set_value(struct net_device * dev,char __user * useraddr,int (* actor)(struct net_device *,u32))1168 static int ethtool_set_value(struct net_device *dev, char __user *useraddr,
1169 			     int (*actor)(struct net_device *, u32))
1170 {
1171 	struct ethtool_value edata;
1172 
1173 	if (!actor)
1174 		return -EOPNOTSUPP;
1175 
1176 	if (copy_from_user(&edata, useraddr, sizeof(edata)))
1177 		return -EFAULT;
1178 
1179 	return actor(dev, edata.data);
1180 }
1181 
ethtool_flash_device(struct net_device * dev,char __user * useraddr)1182 static noinline_for_stack int ethtool_flash_device(struct net_device *dev,
1183 						   char __user *useraddr)
1184 {
1185 	struct ethtool_flash efl;
1186 
1187 	if (copy_from_user(&efl, useraddr, sizeof(efl)))
1188 		return -EFAULT;
1189 
1190 	if (!dev->ethtool_ops->flash_device)
1191 		return -EOPNOTSUPP;
1192 
1193 	efl.data[ETHTOOL_FLASH_MAX_FILENAME - 1] = 0;
1194 
1195 	return dev->ethtool_ops->flash_device(dev, &efl);
1196 }
1197 
ethtool_set_dump(struct net_device * dev,void __user * useraddr)1198 static int ethtool_set_dump(struct net_device *dev,
1199 			void __user *useraddr)
1200 {
1201 	struct ethtool_dump dump;
1202 
1203 	if (!dev->ethtool_ops->set_dump)
1204 		return -EOPNOTSUPP;
1205 
1206 	if (copy_from_user(&dump, useraddr, sizeof(dump)))
1207 		return -EFAULT;
1208 
1209 	return dev->ethtool_ops->set_dump(dev, &dump);
1210 }
1211 
ethtool_get_dump_flag(struct net_device * dev,void __user * useraddr)1212 static int ethtool_get_dump_flag(struct net_device *dev,
1213 				void __user *useraddr)
1214 {
1215 	int ret;
1216 	struct ethtool_dump dump;
1217 	const struct ethtool_ops *ops = dev->ethtool_ops;
1218 
1219 	if (!dev->ethtool_ops->get_dump_flag)
1220 		return -EOPNOTSUPP;
1221 
1222 	if (copy_from_user(&dump, useraddr, sizeof(dump)))
1223 		return -EFAULT;
1224 
1225 	ret = ops->get_dump_flag(dev, &dump);
1226 	if (ret)
1227 		return ret;
1228 
1229 	if (copy_to_user(useraddr, &dump, sizeof(dump)))
1230 		return -EFAULT;
1231 	return 0;
1232 }
1233 
ethtool_get_dump_data(struct net_device * dev,void __user * useraddr)1234 static int ethtool_get_dump_data(struct net_device *dev,
1235 				void __user *useraddr)
1236 {
1237 	int ret;
1238 	__u32 len;
1239 	struct ethtool_dump dump, tmp;
1240 	const struct ethtool_ops *ops = dev->ethtool_ops;
1241 	void *data = NULL;
1242 
1243 	if (!dev->ethtool_ops->get_dump_data ||
1244 		!dev->ethtool_ops->get_dump_flag)
1245 		return -EOPNOTSUPP;
1246 
1247 	if (copy_from_user(&dump, useraddr, sizeof(dump)))
1248 		return -EFAULT;
1249 
1250 	memset(&tmp, 0, sizeof(tmp));
1251 	tmp.cmd = ETHTOOL_GET_DUMP_FLAG;
1252 	ret = ops->get_dump_flag(dev, &tmp);
1253 	if (ret)
1254 		return ret;
1255 
1256 	len = (tmp.len > dump.len) ? dump.len : tmp.len;
1257 	if (!len)
1258 		return -EFAULT;
1259 
1260 	data = vzalloc(tmp.len);
1261 	if (!data)
1262 		return -ENOMEM;
1263 	ret = ops->get_dump_data(dev, &dump, data);
1264 	if (ret)
1265 		goto out;
1266 
1267 	if (copy_to_user(useraddr, &dump, sizeof(dump))) {
1268 		ret = -EFAULT;
1269 		goto out;
1270 	}
1271 	useraddr += offsetof(struct ethtool_dump, data);
1272 	if (copy_to_user(useraddr, data, len))
1273 		ret = -EFAULT;
1274 out:
1275 	vfree(data);
1276 	return ret;
1277 }
1278 
1279 /* The main entry point in this file.  Called from net/core/dev.c */
1280 
dev_ethtool(struct net * net,struct ifreq * ifr)1281 int dev_ethtool(struct net *net, struct ifreq *ifr)
1282 {
1283 	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
1284 	void __user *useraddr = ifr->ifr_data;
1285 	u32 ethcmd;
1286 	int rc;
1287 	u32 old_features;
1288 
1289 	if (!dev || !netif_device_present(dev))
1290 		return -ENODEV;
1291 
1292 	if (copy_from_user(&ethcmd, useraddr, sizeof(ethcmd)))
1293 		return -EFAULT;
1294 
1295 	if (!dev->ethtool_ops) {
1296 		/* ETHTOOL_GDRVINFO does not require any driver support.
1297 		 * It is also unprivileged and does not change anything,
1298 		 * so we can take a shortcut to it. */
1299 		if (ethcmd == ETHTOOL_GDRVINFO)
1300 			return ethtool_get_drvinfo(dev, useraddr);
1301 		else
1302 			return -EOPNOTSUPP;
1303 	}
1304 
1305 	/* Allow some commands to be done by anyone */
1306 	switch (ethcmd) {
1307 	case ETHTOOL_GSET:
1308 	case ETHTOOL_GDRVINFO:
1309 	case ETHTOOL_GMSGLVL:
1310 	case ETHTOOL_GCOALESCE:
1311 	case ETHTOOL_GRINGPARAM:
1312 	case ETHTOOL_GPAUSEPARAM:
1313 	case ETHTOOL_GRXCSUM:
1314 	case ETHTOOL_GTXCSUM:
1315 	case ETHTOOL_GSG:
1316 	case ETHTOOL_GSSET_INFO:
1317 	case ETHTOOL_GSTRINGS:
1318 	case ETHTOOL_GTSO:
1319 	case ETHTOOL_GPERMADDR:
1320 	case ETHTOOL_GUFO:
1321 	case ETHTOOL_GGSO:
1322 	case ETHTOOL_GGRO:
1323 	case ETHTOOL_GFLAGS:
1324 	case ETHTOOL_GPFLAGS:
1325 	case ETHTOOL_GRXFH:
1326 	case ETHTOOL_GRXRINGS:
1327 	case ETHTOOL_GRXCLSRLCNT:
1328 	case ETHTOOL_GRXCLSRULE:
1329 	case ETHTOOL_GRXCLSRLALL:
1330 	case ETHTOOL_GFEATURES:
1331 		break;
1332 	default:
1333 		if (!capable(CAP_NET_ADMIN))
1334 			return -EPERM;
1335 	}
1336 
1337 	if (dev->ethtool_ops->begin) {
1338 		rc = dev->ethtool_ops->begin(dev);
1339 		if (rc  < 0)
1340 			return rc;
1341 	}
1342 	old_features = dev->features;
1343 
1344 	switch (ethcmd) {
1345 	case ETHTOOL_GSET:
1346 		rc = ethtool_get_settings(dev, useraddr);
1347 		break;
1348 	case ETHTOOL_SSET:
1349 		rc = ethtool_set_settings(dev, useraddr);
1350 		break;
1351 	case ETHTOOL_GDRVINFO:
1352 		rc = ethtool_get_drvinfo(dev, useraddr);
1353 		break;
1354 	case ETHTOOL_GREGS:
1355 		rc = ethtool_get_regs(dev, useraddr);
1356 		break;
1357 	case ETHTOOL_GWOL:
1358 		rc = ethtool_get_wol(dev, useraddr);
1359 		break;
1360 	case ETHTOOL_SWOL:
1361 		rc = ethtool_set_wol(dev, useraddr);
1362 		break;
1363 	case ETHTOOL_GMSGLVL:
1364 		rc = ethtool_get_value(dev, useraddr, ethcmd,
1365 				       dev->ethtool_ops->get_msglevel);
1366 		break;
1367 	case ETHTOOL_SMSGLVL:
1368 		rc = ethtool_set_value_void(dev, useraddr,
1369 				       dev->ethtool_ops->set_msglevel);
1370 		break;
1371 	case ETHTOOL_NWAY_RST:
1372 		rc = ethtool_nway_reset(dev);
1373 		break;
1374 	case ETHTOOL_GLINK:
1375 		rc = ethtool_get_link(dev, useraddr);
1376 		break;
1377 	case ETHTOOL_GEEPROM:
1378 		rc = ethtool_get_eeprom(dev, useraddr);
1379 		break;
1380 	case ETHTOOL_SEEPROM:
1381 		rc = ethtool_set_eeprom(dev, useraddr);
1382 		break;
1383 	case ETHTOOL_GCOALESCE:
1384 		rc = ethtool_get_coalesce(dev, useraddr);
1385 		break;
1386 	case ETHTOOL_SCOALESCE:
1387 		rc = ethtool_set_coalesce(dev, useraddr);
1388 		break;
1389 	case ETHTOOL_GRINGPARAM:
1390 		rc = ethtool_get_ringparam(dev, useraddr);
1391 		break;
1392 	case ETHTOOL_SRINGPARAM:
1393 		rc = ethtool_set_ringparam(dev, useraddr);
1394 		break;
1395 	case ETHTOOL_GPAUSEPARAM:
1396 		rc = ethtool_get_pauseparam(dev, useraddr);
1397 		break;
1398 	case ETHTOOL_SPAUSEPARAM:
1399 		rc = ethtool_set_pauseparam(dev, useraddr);
1400 		break;
1401 	case ETHTOOL_TEST:
1402 		rc = ethtool_self_test(dev, useraddr);
1403 		break;
1404 	case ETHTOOL_GSTRINGS:
1405 		rc = ethtool_get_strings(dev, useraddr);
1406 		break;
1407 	case ETHTOOL_PHYS_ID:
1408 		rc = ethtool_phys_id(dev, useraddr);
1409 		break;
1410 	case ETHTOOL_GSTATS:
1411 		rc = ethtool_get_stats(dev, useraddr);
1412 		break;
1413 	case ETHTOOL_GPERMADDR:
1414 		rc = ethtool_get_perm_addr(dev, useraddr);
1415 		break;
1416 	case ETHTOOL_GFLAGS:
1417 		rc = ethtool_get_value(dev, useraddr, ethcmd,
1418 					__ethtool_get_flags);
1419 		break;
1420 	case ETHTOOL_SFLAGS:
1421 		rc = ethtool_set_value(dev, useraddr, __ethtool_set_flags);
1422 		break;
1423 	case ETHTOOL_GPFLAGS:
1424 		rc = ethtool_get_value(dev, useraddr, ethcmd,
1425 				       dev->ethtool_ops->get_priv_flags);
1426 		break;
1427 	case ETHTOOL_SPFLAGS:
1428 		rc = ethtool_set_value(dev, useraddr,
1429 				       dev->ethtool_ops->set_priv_flags);
1430 		break;
1431 	case ETHTOOL_GRXFH:
1432 	case ETHTOOL_GRXRINGS:
1433 	case ETHTOOL_GRXCLSRLCNT:
1434 	case ETHTOOL_GRXCLSRULE:
1435 	case ETHTOOL_GRXCLSRLALL:
1436 		rc = ethtool_get_rxnfc(dev, ethcmd, useraddr);
1437 		break;
1438 	case ETHTOOL_SRXFH:
1439 	case ETHTOOL_SRXCLSRLDEL:
1440 	case ETHTOOL_SRXCLSRLINS:
1441 		rc = ethtool_set_rxnfc(dev, ethcmd, useraddr);
1442 		break;
1443 	case ETHTOOL_FLASHDEV:
1444 		rc = ethtool_flash_device(dev, useraddr);
1445 		break;
1446 	case ETHTOOL_RESET:
1447 		rc = ethtool_reset(dev, useraddr);
1448 		break;
1449 	case ETHTOOL_GSSET_INFO:
1450 		rc = ethtool_get_sset_info(dev, useraddr);
1451 		break;
1452 	case ETHTOOL_GRXFHINDIR:
1453 		rc = ethtool_get_rxfh_indir(dev, useraddr);
1454 		break;
1455 	case ETHTOOL_SRXFHINDIR:
1456 		rc = ethtool_set_rxfh_indir(dev, useraddr);
1457 		break;
1458 	case ETHTOOL_GFEATURES:
1459 		rc = ethtool_get_features(dev, useraddr);
1460 		break;
1461 	case ETHTOOL_SFEATURES:
1462 		rc = ethtool_set_features(dev, useraddr);
1463 		break;
1464 	case ETHTOOL_GTXCSUM:
1465 	case ETHTOOL_GRXCSUM:
1466 	case ETHTOOL_GSG:
1467 	case ETHTOOL_GTSO:
1468 	case ETHTOOL_GUFO:
1469 	case ETHTOOL_GGSO:
1470 	case ETHTOOL_GGRO:
1471 		rc = ethtool_get_one_feature(dev, useraddr, ethcmd);
1472 		break;
1473 	case ETHTOOL_STXCSUM:
1474 	case ETHTOOL_SRXCSUM:
1475 	case ETHTOOL_SSG:
1476 	case ETHTOOL_STSO:
1477 	case ETHTOOL_SUFO:
1478 	case ETHTOOL_SGSO:
1479 	case ETHTOOL_SGRO:
1480 		rc = ethtool_set_one_feature(dev, useraddr, ethcmd);
1481 		break;
1482 	case ETHTOOL_GCHANNELS:
1483 		rc = ethtool_get_channels(dev, useraddr);
1484 		break;
1485 	case ETHTOOL_SCHANNELS:
1486 		rc = ethtool_set_channels(dev, useraddr);
1487 		break;
1488 	case ETHTOOL_SET_DUMP:
1489 		rc = ethtool_set_dump(dev, useraddr);
1490 		break;
1491 	case ETHTOOL_GET_DUMP_FLAG:
1492 		rc = ethtool_get_dump_flag(dev, useraddr);
1493 		break;
1494 	case ETHTOOL_GET_DUMP_DATA:
1495 		rc = ethtool_get_dump_data(dev, useraddr);
1496 		break;
1497 	default:
1498 		rc = -EOPNOTSUPP;
1499 	}
1500 
1501 	if (dev->ethtool_ops->complete)
1502 		dev->ethtool_ops->complete(dev);
1503 
1504 	if (old_features != dev->features)
1505 		netdev_features_change(dev);
1506 
1507 	return rc;
1508 }
1509