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TOMOYO Linux Cross Reference
Linux/net/core/ethtool.c

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  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/net_tstamp.h>
 21 #include <linux/phy.h>
 22 #include <linux/bitops.h>
 23 #include <linux/uaccess.h>
 24 #include <linux/vmalloc.h>
 25 #include <linux/sfp.h>
 26 #include <linux/slab.h>
 27 #include <linux/rtnetlink.h>
 28 #include <linux/sched/signal.h>
 29 #include <linux/net.h>
 30 #include <net/xdp_sock.h>
 31 
 32 /*
 33  * Some useful ethtool_ops methods that're device independent.
 34  * If we find that all drivers want to do the same thing here,
 35  * we can turn these into dev_() function calls.
 36  */
 37 
 38 u32 ethtool_op_get_link(struct net_device *dev)
 39 {
 40         return netif_carrier_ok(dev) ? 1 : 0;
 41 }
 42 EXPORT_SYMBOL(ethtool_op_get_link);
 43 
 44 int ethtool_op_get_ts_info(struct net_device *dev, struct ethtool_ts_info *info)
 45 {
 46         info->so_timestamping =
 47                 SOF_TIMESTAMPING_TX_SOFTWARE |
 48                 SOF_TIMESTAMPING_RX_SOFTWARE |
 49                 SOF_TIMESTAMPING_SOFTWARE;
 50         info->phc_index = -1;
 51         return 0;
 52 }
 53 EXPORT_SYMBOL(ethtool_op_get_ts_info);
 54 
 55 /* Handlers for each ethtool command */
 56 
 57 #define ETHTOOL_DEV_FEATURE_WORDS       ((NETDEV_FEATURE_COUNT + 31) / 32)
 58 
 59 static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN] = {
 60         [NETIF_F_SG_BIT] =               "tx-scatter-gather",
 61         [NETIF_F_IP_CSUM_BIT] =          "tx-checksum-ipv4",
 62         [NETIF_F_HW_CSUM_BIT] =          "tx-checksum-ip-generic",
 63         [NETIF_F_IPV6_CSUM_BIT] =        "tx-checksum-ipv6",
 64         [NETIF_F_HIGHDMA_BIT] =          "highdma",
 65         [NETIF_F_FRAGLIST_BIT] =         "tx-scatter-gather-fraglist",
 66         [NETIF_F_HW_VLAN_CTAG_TX_BIT] =  "tx-vlan-hw-insert",
 67 
 68         [NETIF_F_HW_VLAN_CTAG_RX_BIT] =  "rx-vlan-hw-parse",
 69         [NETIF_F_HW_VLAN_CTAG_FILTER_BIT] = "rx-vlan-filter",
 70         [NETIF_F_HW_VLAN_STAG_TX_BIT] =  "tx-vlan-stag-hw-insert",
 71         [NETIF_F_HW_VLAN_STAG_RX_BIT] =  "rx-vlan-stag-hw-parse",
 72         [NETIF_F_HW_VLAN_STAG_FILTER_BIT] = "rx-vlan-stag-filter",
 73         [NETIF_F_VLAN_CHALLENGED_BIT] =  "vlan-challenged",
 74         [NETIF_F_GSO_BIT] =              "tx-generic-segmentation",
 75         [NETIF_F_LLTX_BIT] =             "tx-lockless",
 76         [NETIF_F_NETNS_LOCAL_BIT] =      "netns-local",
 77         [NETIF_F_GRO_BIT] =              "rx-gro",
 78         [NETIF_F_GRO_HW_BIT] =           "rx-gro-hw",
 79         [NETIF_F_LRO_BIT] =              "rx-lro",
 80 
 81         [NETIF_F_TSO_BIT] =              "tx-tcp-segmentation",
 82         [NETIF_F_GSO_ROBUST_BIT] =       "tx-gso-robust",
 83         [NETIF_F_TSO_ECN_BIT] =          "tx-tcp-ecn-segmentation",
 84         [NETIF_F_TSO_MANGLEID_BIT] =     "tx-tcp-mangleid-segmentation",
 85         [NETIF_F_TSO6_BIT] =             "tx-tcp6-segmentation",
 86         [NETIF_F_FSO_BIT] =              "tx-fcoe-segmentation",
 87         [NETIF_F_GSO_GRE_BIT] =          "tx-gre-segmentation",
 88         [NETIF_F_GSO_GRE_CSUM_BIT] =     "tx-gre-csum-segmentation",
 89         [NETIF_F_GSO_IPXIP4_BIT] =       "tx-ipxip4-segmentation",
 90         [NETIF_F_GSO_IPXIP6_BIT] =       "tx-ipxip6-segmentation",
 91         [NETIF_F_GSO_UDP_TUNNEL_BIT] =   "tx-udp_tnl-segmentation",
 92         [NETIF_F_GSO_UDP_TUNNEL_CSUM_BIT] = "tx-udp_tnl-csum-segmentation",
 93         [NETIF_F_GSO_PARTIAL_BIT] =      "tx-gso-partial",
 94         [NETIF_F_GSO_SCTP_BIT] =         "tx-sctp-segmentation",
 95         [NETIF_F_GSO_ESP_BIT] =          "tx-esp-segmentation",
 96         [NETIF_F_GSO_UDP_L4_BIT] =       "tx-udp-segmentation",
 97 
 98         [NETIF_F_FCOE_CRC_BIT] =         "tx-checksum-fcoe-crc",
 99         [NETIF_F_SCTP_CRC_BIT] =        "tx-checksum-sctp",
100         [NETIF_F_FCOE_MTU_BIT] =         "fcoe-mtu",
101         [NETIF_F_NTUPLE_BIT] =           "rx-ntuple-filter",
102         [NETIF_F_RXHASH_BIT] =           "rx-hashing",
103         [NETIF_F_RXCSUM_BIT] =           "rx-checksum",
104         [NETIF_F_NOCACHE_COPY_BIT] =     "tx-nocache-copy",
105         [NETIF_F_LOOPBACK_BIT] =         "loopback",
106         [NETIF_F_RXFCS_BIT] =            "rx-fcs",
107         [NETIF_F_RXALL_BIT] =            "rx-all",
108         [NETIF_F_HW_L2FW_DOFFLOAD_BIT] = "l2-fwd-offload",
109         [NETIF_F_HW_TC_BIT] =            "hw-tc-offload",
110         [NETIF_F_HW_ESP_BIT] =           "esp-hw-offload",
111         [NETIF_F_HW_ESP_TX_CSUM_BIT] =   "esp-tx-csum-hw-offload",
112         [NETIF_F_RX_UDP_TUNNEL_PORT_BIT] =       "rx-udp_tunnel-port-offload",
113         [NETIF_F_HW_TLS_RECORD_BIT] =   "tls-hw-record",
114         [NETIF_F_HW_TLS_TX_BIT] =        "tls-hw-tx-offload",
115         [NETIF_F_HW_TLS_RX_BIT] =        "tls-hw-rx-offload",
116 };
117 
118 static const char
119 rss_hash_func_strings[ETH_RSS_HASH_FUNCS_COUNT][ETH_GSTRING_LEN] = {
120         [ETH_RSS_HASH_TOP_BIT] =        "toeplitz",
121         [ETH_RSS_HASH_XOR_BIT] =        "xor",
122         [ETH_RSS_HASH_CRC32_BIT] =      "crc32",
123 };
124 
125 static const char
126 tunable_strings[__ETHTOOL_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
127         [ETHTOOL_ID_UNSPEC]     = "Unspec",
128         [ETHTOOL_RX_COPYBREAK]  = "rx-copybreak",
129         [ETHTOOL_TX_COPYBREAK]  = "tx-copybreak",
130         [ETHTOOL_PFC_PREVENTION_TOUT] = "pfc-prevention-tout",
131 };
132 
133 static const char
134 phy_tunable_strings[__ETHTOOL_PHY_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
135         [ETHTOOL_ID_UNSPEC]     = "Unspec",
136         [ETHTOOL_PHY_DOWNSHIFT] = "phy-downshift",
137 };
138 
139 static int ethtool_get_features(struct net_device *dev, void __user *useraddr)
140 {
141         struct ethtool_gfeatures cmd = {
142                 .cmd = ETHTOOL_GFEATURES,
143                 .size = ETHTOOL_DEV_FEATURE_WORDS,
144         };
145         struct ethtool_get_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
146         u32 __user *sizeaddr;
147         u32 copy_size;
148         int i;
149 
150         /* in case feature bits run out again */
151         BUILD_BUG_ON(ETHTOOL_DEV_FEATURE_WORDS * sizeof(u32) > sizeof(netdev_features_t));
152 
153         for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
154                 features[i].available = (u32)(dev->hw_features >> (32 * i));
155                 features[i].requested = (u32)(dev->wanted_features >> (32 * i));
156                 features[i].active = (u32)(dev->features >> (32 * i));
157                 features[i].never_changed =
158                         (u32)(NETIF_F_NEVER_CHANGE >> (32 * i));
159         }
160 
161         sizeaddr = useraddr + offsetof(struct ethtool_gfeatures, size);
162         if (get_user(copy_size, sizeaddr))
163                 return -EFAULT;
164 
165         if (copy_size > ETHTOOL_DEV_FEATURE_WORDS)
166                 copy_size = ETHTOOL_DEV_FEATURE_WORDS;
167 
168         if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
169                 return -EFAULT;
170         useraddr += sizeof(cmd);
171         if (copy_to_user(useraddr, features, copy_size * sizeof(*features)))
172                 return -EFAULT;
173 
174         return 0;
175 }
176 
177 static int ethtool_set_features(struct net_device *dev, void __user *useraddr)
178 {
179         struct ethtool_sfeatures cmd;
180         struct ethtool_set_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
181         netdev_features_t wanted = 0, valid = 0;
182         int i, ret = 0;
183 
184         if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
185                 return -EFAULT;
186         useraddr += sizeof(cmd);
187 
188         if (cmd.size != ETHTOOL_DEV_FEATURE_WORDS)
189                 return -EINVAL;
190 
191         if (copy_from_user(features, useraddr, sizeof(features)))
192                 return -EFAULT;
193 
194         for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
195                 valid |= (netdev_features_t)features[i].valid << (32 * i);
196                 wanted |= (netdev_features_t)features[i].requested << (32 * i);
197         }
198 
199         if (valid & ~NETIF_F_ETHTOOL_BITS)
200                 return -EINVAL;
201 
202         if (valid & ~dev->hw_features) {
203                 valid &= dev->hw_features;
204                 ret |= ETHTOOL_F_UNSUPPORTED;
205         }
206 
207         dev->wanted_features &= ~valid;
208         dev->wanted_features |= wanted & valid;
209         __netdev_update_features(dev);
210 
211         if ((dev->wanted_features ^ dev->features) & valid)
212                 ret |= ETHTOOL_F_WISH;
213 
214         return ret;
215 }
216 
217 static int __ethtool_get_sset_count(struct net_device *dev, int sset)
218 {
219         const struct ethtool_ops *ops = dev->ethtool_ops;
220 
221         if (sset == ETH_SS_FEATURES)
222                 return ARRAY_SIZE(netdev_features_strings);
223 
224         if (sset == ETH_SS_RSS_HASH_FUNCS)
225                 return ARRAY_SIZE(rss_hash_func_strings);
226 
227         if (sset == ETH_SS_TUNABLES)
228                 return ARRAY_SIZE(tunable_strings);
229 
230         if (sset == ETH_SS_PHY_TUNABLES)
231                 return ARRAY_SIZE(phy_tunable_strings);
232 
233         if (sset == ETH_SS_PHY_STATS && dev->phydev &&
234             !ops->get_ethtool_phy_stats)
235                 return phy_ethtool_get_sset_count(dev->phydev);
236 
237         if (ops->get_sset_count && ops->get_strings)
238                 return ops->get_sset_count(dev, sset);
239         else
240                 return -EOPNOTSUPP;
241 }
242 
243 static void __ethtool_get_strings(struct net_device *dev,
244         u32 stringset, u8 *data)
245 {
246         const struct ethtool_ops *ops = dev->ethtool_ops;
247 
248         if (stringset == ETH_SS_FEATURES)
249                 memcpy(data, netdev_features_strings,
250                         sizeof(netdev_features_strings));
251         else if (stringset == ETH_SS_RSS_HASH_FUNCS)
252                 memcpy(data, rss_hash_func_strings,
253                        sizeof(rss_hash_func_strings));
254         else if (stringset == ETH_SS_TUNABLES)
255                 memcpy(data, tunable_strings, sizeof(tunable_strings));
256         else if (stringset == ETH_SS_PHY_TUNABLES)
257                 memcpy(data, phy_tunable_strings, sizeof(phy_tunable_strings));
258         else if (stringset == ETH_SS_PHY_STATS && dev->phydev &&
259                  !ops->get_ethtool_phy_stats)
260                 phy_ethtool_get_strings(dev->phydev, data);
261         else
262                 /* ops->get_strings is valid because checked earlier */
263                 ops->get_strings(dev, stringset, data);
264 }
265 
266 static netdev_features_t ethtool_get_feature_mask(u32 eth_cmd)
267 {
268         /* feature masks of legacy discrete ethtool ops */
269 
270         switch (eth_cmd) {
271         case ETHTOOL_GTXCSUM:
272         case ETHTOOL_STXCSUM:
273                 return NETIF_F_CSUM_MASK | NETIF_F_SCTP_CRC;
274         case ETHTOOL_GRXCSUM:
275         case ETHTOOL_SRXCSUM:
276                 return NETIF_F_RXCSUM;
277         case ETHTOOL_GSG:
278         case ETHTOOL_SSG:
279                 return NETIF_F_SG;
280         case ETHTOOL_GTSO:
281         case ETHTOOL_STSO:
282                 return NETIF_F_ALL_TSO;
283         case ETHTOOL_GGSO:
284         case ETHTOOL_SGSO:
285                 return NETIF_F_GSO;
286         case ETHTOOL_GGRO:
287         case ETHTOOL_SGRO:
288                 return NETIF_F_GRO;
289         default:
290                 BUG();
291         }
292 }
293 
294 static int ethtool_get_one_feature(struct net_device *dev,
295         char __user *useraddr, u32 ethcmd)
296 {
297         netdev_features_t mask = ethtool_get_feature_mask(ethcmd);
298         struct ethtool_value edata = {
299                 .cmd = ethcmd,
300                 .data = !!(dev->features & mask),
301         };
302 
303         if (copy_to_user(useraddr, &edata, sizeof(edata)))
304                 return -EFAULT;
305         return 0;
306 }
307 
308 static int ethtool_set_one_feature(struct net_device *dev,
309         void __user *useraddr, u32 ethcmd)
310 {
311         struct ethtool_value edata;
312         netdev_features_t mask;
313 
314         if (copy_from_user(&edata, useraddr, sizeof(edata)))
315                 return -EFAULT;
316 
317         mask = ethtool_get_feature_mask(ethcmd);
318         mask &= dev->hw_features;
319         if (!mask)
320                 return -EOPNOTSUPP;
321 
322         if (edata.data)
323                 dev->wanted_features |= mask;
324         else
325                 dev->wanted_features &= ~mask;
326 
327         __netdev_update_features(dev);
328 
329         return 0;
330 }
331 
332 #define ETH_ALL_FLAGS    (ETH_FLAG_LRO | ETH_FLAG_RXVLAN | ETH_FLAG_TXVLAN | \
333                           ETH_FLAG_NTUPLE | ETH_FLAG_RXHASH)
334 #define ETH_ALL_FEATURES (NETIF_F_LRO | NETIF_F_HW_VLAN_CTAG_RX | \
335                           NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_NTUPLE | \
336                           NETIF_F_RXHASH)
337 
338 static u32 __ethtool_get_flags(struct net_device *dev)
339 {
340         u32 flags = 0;
341 
342         if (dev->features & NETIF_F_LRO)
343                 flags |= ETH_FLAG_LRO;
344         if (dev->features & NETIF_F_HW_VLAN_CTAG_RX)
345                 flags |= ETH_FLAG_RXVLAN;
346         if (dev->features & NETIF_F_HW_VLAN_CTAG_TX)
347                 flags |= ETH_FLAG_TXVLAN;
348         if (dev->features & NETIF_F_NTUPLE)
349                 flags |= ETH_FLAG_NTUPLE;
350         if (dev->features & NETIF_F_RXHASH)
351                 flags |= ETH_FLAG_RXHASH;
352 
353         return flags;
354 }
355 
356 static int __ethtool_set_flags(struct net_device *dev, u32 data)
357 {
358         netdev_features_t features = 0, changed;
359 
360         if (data & ~ETH_ALL_FLAGS)
361                 return -EINVAL;
362 
363         if (data & ETH_FLAG_LRO)
364                 features |= NETIF_F_LRO;
365         if (data & ETH_FLAG_RXVLAN)
366                 features |= NETIF_F_HW_VLAN_CTAG_RX;
367         if (data & ETH_FLAG_TXVLAN)
368                 features |= NETIF_F_HW_VLAN_CTAG_TX;
369         if (data & ETH_FLAG_NTUPLE)
370                 features |= NETIF_F_NTUPLE;
371         if (data & ETH_FLAG_RXHASH)
372                 features |= NETIF_F_RXHASH;
373 
374         /* allow changing only bits set in hw_features */
375         changed = (features ^ dev->features) & ETH_ALL_FEATURES;
376         if (changed & ~dev->hw_features)
377                 return (changed & dev->hw_features) ? -EINVAL : -EOPNOTSUPP;
378 
379         dev->wanted_features =
380                 (dev->wanted_features & ~changed) | (features & changed);
381 
382         __netdev_update_features(dev);
383 
384         return 0;
385 }
386 
387 /* Given two link masks, AND them together and save the result in dst. */
388 void ethtool_intersect_link_masks(struct ethtool_link_ksettings *dst,
389                                   struct ethtool_link_ksettings *src)
390 {
391         unsigned int size = BITS_TO_LONGS(__ETHTOOL_LINK_MODE_MASK_NBITS);
392         unsigned int idx = 0;
393 
394         for (; idx < size; idx++) {
395                 dst->link_modes.supported[idx] &=
396                         src->link_modes.supported[idx];
397                 dst->link_modes.advertising[idx] &=
398                         src->link_modes.advertising[idx];
399         }
400 }
401 EXPORT_SYMBOL(ethtool_intersect_link_masks);
402 
403 void ethtool_convert_legacy_u32_to_link_mode(unsigned long *dst,
404                                              u32 legacy_u32)
405 {
406         bitmap_zero(dst, __ETHTOOL_LINK_MODE_MASK_NBITS);
407         dst[0] = legacy_u32;
408 }
409 EXPORT_SYMBOL(ethtool_convert_legacy_u32_to_link_mode);
410 
411 /* return false if src had higher bits set. lower bits always updated. */
412 bool ethtool_convert_link_mode_to_legacy_u32(u32 *legacy_u32,
413                                              const unsigned long *src)
414 {
415         bool retval = true;
416 
417         /* TODO: following test will soon always be true */
418         if (__ETHTOOL_LINK_MODE_MASK_NBITS > 32) {
419                 __ETHTOOL_DECLARE_LINK_MODE_MASK(ext);
420 
421                 bitmap_zero(ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
422                 bitmap_fill(ext, 32);
423                 bitmap_complement(ext, ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
424                 if (bitmap_intersects(ext, src,
425                                       __ETHTOOL_LINK_MODE_MASK_NBITS)) {
426                         /* src mask goes beyond bit 31 */
427                         retval = false;
428                 }
429         }
430         *legacy_u32 = src[0];
431         return retval;
432 }
433 EXPORT_SYMBOL(ethtool_convert_link_mode_to_legacy_u32);
434 
435 /* return false if legacy contained non-0 deprecated fields
436  * maxtxpkt/maxrxpkt. rest of ksettings always updated
437  */
438 static bool
439 convert_legacy_settings_to_link_ksettings(
440         struct ethtool_link_ksettings *link_ksettings,
441         const struct ethtool_cmd *legacy_settings)
442 {
443         bool retval = true;
444 
445         memset(link_ksettings, 0, sizeof(*link_ksettings));
446 
447         /* This is used to tell users that driver is still using these
448          * deprecated legacy fields, and they should not use
449          * %ETHTOOL_GLINKSETTINGS/%ETHTOOL_SLINKSETTINGS
450          */
451         if (legacy_settings->maxtxpkt ||
452             legacy_settings->maxrxpkt)
453                 retval = false;
454 
455         ethtool_convert_legacy_u32_to_link_mode(
456                 link_ksettings->link_modes.supported,
457                 legacy_settings->supported);
458         ethtool_convert_legacy_u32_to_link_mode(
459                 link_ksettings->link_modes.advertising,
460                 legacy_settings->advertising);
461         ethtool_convert_legacy_u32_to_link_mode(
462                 link_ksettings->link_modes.lp_advertising,
463                 legacy_settings->lp_advertising);
464         link_ksettings->base.speed
465                 = ethtool_cmd_speed(legacy_settings);
466         link_ksettings->base.duplex
467                 = legacy_settings->duplex;
468         link_ksettings->base.port
469                 = legacy_settings->port;
470         link_ksettings->base.phy_address
471                 = legacy_settings->phy_address;
472         link_ksettings->base.autoneg
473                 = legacy_settings->autoneg;
474         link_ksettings->base.mdio_support
475                 = legacy_settings->mdio_support;
476         link_ksettings->base.eth_tp_mdix
477                 = legacy_settings->eth_tp_mdix;
478         link_ksettings->base.eth_tp_mdix_ctrl
479                 = legacy_settings->eth_tp_mdix_ctrl;
480         return retval;
481 }
482 
483 /* return false if ksettings link modes had higher bits
484  * set. legacy_settings always updated (best effort)
485  */
486 static bool
487 convert_link_ksettings_to_legacy_settings(
488         struct ethtool_cmd *legacy_settings,
489         const struct ethtool_link_ksettings *link_ksettings)
490 {
491         bool retval = true;
492 
493         memset(legacy_settings, 0, sizeof(*legacy_settings));
494         /* this also clears the deprecated fields in legacy structure:
495          * __u8         transceiver;
496          * __u32        maxtxpkt;
497          * __u32        maxrxpkt;
498          */
499 
500         retval &= ethtool_convert_link_mode_to_legacy_u32(
501                 &legacy_settings->supported,
502                 link_ksettings->link_modes.supported);
503         retval &= ethtool_convert_link_mode_to_legacy_u32(
504                 &legacy_settings->advertising,
505                 link_ksettings->link_modes.advertising);
506         retval &= ethtool_convert_link_mode_to_legacy_u32(
507                 &legacy_settings->lp_advertising,
508                 link_ksettings->link_modes.lp_advertising);
509         ethtool_cmd_speed_set(legacy_settings, link_ksettings->base.speed);
510         legacy_settings->duplex
511                 = link_ksettings->base.duplex;
512         legacy_settings->port
513                 = link_ksettings->base.port;
514         legacy_settings->phy_address
515                 = link_ksettings->base.phy_address;
516         legacy_settings->autoneg
517                 = link_ksettings->base.autoneg;
518         legacy_settings->mdio_support
519                 = link_ksettings->base.mdio_support;
520         legacy_settings->eth_tp_mdix
521                 = link_ksettings->base.eth_tp_mdix;
522         legacy_settings->eth_tp_mdix_ctrl
523                 = link_ksettings->base.eth_tp_mdix_ctrl;
524         legacy_settings->transceiver
525                 = link_ksettings->base.transceiver;
526         return retval;
527 }
528 
529 /* number of 32-bit words to store the user's link mode bitmaps */
530 #define __ETHTOOL_LINK_MODE_MASK_NU32                   \
531         DIV_ROUND_UP(__ETHTOOL_LINK_MODE_MASK_NBITS, 32)
532 
533 /* layout of the struct passed from/to userland */
534 struct ethtool_link_usettings {
535         struct ethtool_link_settings base;
536         struct {
537                 __u32 supported[__ETHTOOL_LINK_MODE_MASK_NU32];
538                 __u32 advertising[__ETHTOOL_LINK_MODE_MASK_NU32];
539                 __u32 lp_advertising[__ETHTOOL_LINK_MODE_MASK_NU32];
540         } link_modes;
541 };
542 
543 /* Internal kernel helper to query a device ethtool_link_settings. */
544 int __ethtool_get_link_ksettings(struct net_device *dev,
545                                  struct ethtool_link_ksettings *link_ksettings)
546 {
547         ASSERT_RTNL();
548 
549         if (!dev->ethtool_ops->get_link_ksettings)
550                 return -EOPNOTSUPP;
551 
552         memset(link_ksettings, 0, sizeof(*link_ksettings));
553         return dev->ethtool_ops->get_link_ksettings(dev, link_ksettings);
554 }
555 EXPORT_SYMBOL(__ethtool_get_link_ksettings);
556 
557 /* convert ethtool_link_usettings in user space to a kernel internal
558  * ethtool_link_ksettings. return 0 on success, errno on error.
559  */
560 static int load_link_ksettings_from_user(struct ethtool_link_ksettings *to,
561                                          const void __user *from)
562 {
563         struct ethtool_link_usettings link_usettings;
564 
565         if (copy_from_user(&link_usettings, from, sizeof(link_usettings)))
566                 return -EFAULT;
567 
568         memcpy(&to->base, &link_usettings.base, sizeof(to->base));
569         bitmap_from_arr32(to->link_modes.supported,
570                           link_usettings.link_modes.supported,
571                           __ETHTOOL_LINK_MODE_MASK_NBITS);
572         bitmap_from_arr32(to->link_modes.advertising,
573                           link_usettings.link_modes.advertising,
574                           __ETHTOOL_LINK_MODE_MASK_NBITS);
575         bitmap_from_arr32(to->link_modes.lp_advertising,
576                           link_usettings.link_modes.lp_advertising,
577                           __ETHTOOL_LINK_MODE_MASK_NBITS);
578 
579         return 0;
580 }
581 
582 /* convert a kernel internal ethtool_link_ksettings to
583  * ethtool_link_usettings in user space. return 0 on success, errno on
584  * error.
585  */
586 static int
587 store_link_ksettings_for_user(void __user *to,
588                               const struct ethtool_link_ksettings *from)
589 {
590         struct ethtool_link_usettings link_usettings;
591 
592         memcpy(&link_usettings.base, &from->base, sizeof(link_usettings));
593         bitmap_to_arr32(link_usettings.link_modes.supported,
594                         from->link_modes.supported,
595                         __ETHTOOL_LINK_MODE_MASK_NBITS);
596         bitmap_to_arr32(link_usettings.link_modes.advertising,
597                         from->link_modes.advertising,
598                         __ETHTOOL_LINK_MODE_MASK_NBITS);
599         bitmap_to_arr32(link_usettings.link_modes.lp_advertising,
600                         from->link_modes.lp_advertising,
601                         __ETHTOOL_LINK_MODE_MASK_NBITS);
602 
603         if (copy_to_user(to, &link_usettings, sizeof(link_usettings)))
604                 return -EFAULT;
605 
606         return 0;
607 }
608 
609 /* Query device for its ethtool_link_settings. */
610 static int ethtool_get_link_ksettings(struct net_device *dev,
611                                       void __user *useraddr)
612 {
613         int err = 0;
614         struct ethtool_link_ksettings link_ksettings;
615 
616         ASSERT_RTNL();
617         if (!dev->ethtool_ops->get_link_ksettings)
618                 return -EOPNOTSUPP;
619 
620         /* handle bitmap nbits handshake */
621         if (copy_from_user(&link_ksettings.base, useraddr,
622                            sizeof(link_ksettings.base)))
623                 return -EFAULT;
624 
625         if (__ETHTOOL_LINK_MODE_MASK_NU32
626             != link_ksettings.base.link_mode_masks_nwords) {
627                 /* wrong link mode nbits requested */
628                 memset(&link_ksettings, 0, sizeof(link_ksettings));
629                 link_ksettings.base.cmd = ETHTOOL_GLINKSETTINGS;
630                 /* send back number of words required as negative val */
631                 compiletime_assert(__ETHTOOL_LINK_MODE_MASK_NU32 <= S8_MAX,
632                                    "need too many bits for link modes!");
633                 link_ksettings.base.link_mode_masks_nwords
634                         = -((s8)__ETHTOOL_LINK_MODE_MASK_NU32);
635 
636                 /* copy the base fields back to user, not the link
637                  * mode bitmaps
638                  */
639                 if (copy_to_user(useraddr, &link_ksettings.base,
640                                  sizeof(link_ksettings.base)))
641                         return -EFAULT;
642 
643                 return 0;
644         }
645 
646         /* handshake successful: user/kernel agree on
647          * link_mode_masks_nwords
648          */
649 
650         memset(&link_ksettings, 0, sizeof(link_ksettings));
651         err = dev->ethtool_ops->get_link_ksettings(dev, &link_ksettings);
652         if (err < 0)
653                 return err;
654 
655         /* make sure we tell the right values to user */
656         link_ksettings.base.cmd = ETHTOOL_GLINKSETTINGS;
657         link_ksettings.base.link_mode_masks_nwords
658                 = __ETHTOOL_LINK_MODE_MASK_NU32;
659 
660         return store_link_ksettings_for_user(useraddr, &link_ksettings);
661 }
662 
663 /* Update device ethtool_link_settings. */
664 static int ethtool_set_link_ksettings(struct net_device *dev,
665                                       void __user *useraddr)
666 {
667         int err;
668         struct ethtool_link_ksettings link_ksettings;
669 
670         ASSERT_RTNL();
671 
672         if (!dev->ethtool_ops->set_link_ksettings)
673                 return -EOPNOTSUPP;
674 
675         /* make sure nbits field has expected value */
676         if (copy_from_user(&link_ksettings.base, useraddr,
677                            sizeof(link_ksettings.base)))
678                 return -EFAULT;
679 
680         if (__ETHTOOL_LINK_MODE_MASK_NU32
681             != link_ksettings.base.link_mode_masks_nwords)
682                 return -EINVAL;
683 
684         /* copy the whole structure, now that we know it has expected
685          * format
686          */
687         err = load_link_ksettings_from_user(&link_ksettings, useraddr);
688         if (err)
689                 return err;
690 
691         /* re-check nwords field, just in case */
692         if (__ETHTOOL_LINK_MODE_MASK_NU32
693             != link_ksettings.base.link_mode_masks_nwords)
694                 return -EINVAL;
695 
696         return dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings);
697 }
698 
699 /* Query device for its ethtool_cmd settings.
700  *
701  * Backward compatibility note: for compatibility with legacy ethtool, this is
702  * now implemented via get_link_ksettings. When driver reports higher link mode
703  * bits, a kernel warning is logged once (with name of 1st driver/device) to
704  * recommend user to upgrade ethtool, but the command is successful (only the
705  * lower link mode bits reported back to user). Deprecated fields from
706  * ethtool_cmd (transceiver/maxrxpkt/maxtxpkt) are always set to zero.
707  */
708 static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
709 {
710         struct ethtool_link_ksettings link_ksettings;
711         struct ethtool_cmd cmd;
712         int err;
713 
714         ASSERT_RTNL();
715         if (!dev->ethtool_ops->get_link_ksettings)
716                 return -EOPNOTSUPP;
717 
718         memset(&link_ksettings, 0, sizeof(link_ksettings));
719         err = dev->ethtool_ops->get_link_ksettings(dev, &link_ksettings);
720         if (err < 0)
721                 return err;
722         convert_link_ksettings_to_legacy_settings(&cmd, &link_ksettings);
723 
724         /* send a sensible cmd tag back to user */
725         cmd.cmd = ETHTOOL_GSET;
726 
727         if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
728                 return -EFAULT;
729 
730         return 0;
731 }
732 
733 /* Update device link settings with given ethtool_cmd.
734  *
735  * Backward compatibility note: for compatibility with legacy ethtool, this is
736  * now always implemented via set_link_settings. When user's request updates
737  * deprecated ethtool_cmd fields (transceiver/maxrxpkt/maxtxpkt), a kernel
738  * warning is logged once (with name of 1st driver/device) to recommend user to
739  * upgrade ethtool, and the request is rejected.
740  */
741 static int ethtool_set_settings(struct net_device *dev, void __user *useraddr)
742 {
743         struct ethtool_link_ksettings link_ksettings;
744         struct ethtool_cmd cmd;
745 
746         ASSERT_RTNL();
747 
748         if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
749                 return -EFAULT;
750         if (!dev->ethtool_ops->set_link_ksettings)
751                 return -EOPNOTSUPP;
752 
753         if (!convert_legacy_settings_to_link_ksettings(&link_ksettings, &cmd))
754                 return -EINVAL;
755         link_ksettings.base.link_mode_masks_nwords =
756                 __ETHTOOL_LINK_MODE_MASK_NU32;
757         return dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings);
758 }
759 
760 static noinline_for_stack int ethtool_get_drvinfo(struct net_device *dev,
761                                                   void __user *useraddr)
762 {
763         struct ethtool_drvinfo info;
764         const struct ethtool_ops *ops = dev->ethtool_ops;
765 
766         memset(&info, 0, sizeof(info));
767         info.cmd = ETHTOOL_GDRVINFO;
768         if (ops->get_drvinfo) {
769                 ops->get_drvinfo(dev, &info);
770         } else if (dev->dev.parent && dev->dev.parent->driver) {
771                 strlcpy(info.bus_info, dev_name(dev->dev.parent),
772                         sizeof(info.bus_info));
773                 strlcpy(info.driver, dev->dev.parent->driver->name,
774                         sizeof(info.driver));
775         } else {
776                 return -EOPNOTSUPP;
777         }
778 
779         /*
780          * this method of obtaining string set info is deprecated;
781          * Use ETHTOOL_GSSET_INFO instead.
782          */
783         if (ops->get_sset_count) {
784                 int rc;
785 
786                 rc = ops->get_sset_count(dev, ETH_SS_TEST);
787                 if (rc >= 0)
788                         info.testinfo_len = rc;
789                 rc = ops->get_sset_count(dev, ETH_SS_STATS);
790                 if (rc >= 0)
791                         info.n_stats = rc;
792                 rc = ops->get_sset_count(dev, ETH_SS_PRIV_FLAGS);
793                 if (rc >= 0)
794                         info.n_priv_flags = rc;
795         }
796         if (ops->get_regs_len)
797                 info.regdump_len = ops->get_regs_len(dev);
798         if (ops->get_eeprom_len)
799                 info.eedump_len = ops->get_eeprom_len(dev);
800 
801         if (copy_to_user(useraddr, &info, sizeof(info)))
802                 return -EFAULT;
803         return 0;
804 }
805 
806 static noinline_for_stack int ethtool_get_sset_info(struct net_device *dev,
807                                                     void __user *useraddr)
808 {
809         struct ethtool_sset_info info;
810         u64 sset_mask;
811         int i, idx = 0, n_bits = 0, ret, rc;
812         u32 *info_buf = NULL;
813 
814         if (copy_from_user(&info, useraddr, sizeof(info)))
815                 return -EFAULT;
816 
817         /* store copy of mask, because we zero struct later on */
818         sset_mask = info.sset_mask;
819         if (!sset_mask)
820                 return 0;
821 
822         /* calculate size of return buffer */
823         n_bits = hweight64(sset_mask);
824 
825         memset(&info, 0, sizeof(info));
826         info.cmd = ETHTOOL_GSSET_INFO;
827 
828         info_buf = kcalloc(n_bits, sizeof(u32), GFP_USER);
829         if (!info_buf)
830                 return -ENOMEM;
831 
832         /*
833          * fill return buffer based on input bitmask and successful
834          * get_sset_count return
835          */
836         for (i = 0; i < 64; i++) {
837                 if (!(sset_mask & (1ULL << i)))
838                         continue;
839 
840                 rc = __ethtool_get_sset_count(dev, i);
841                 if (rc >= 0) {
842                         info.sset_mask |= (1ULL << i);
843                         info_buf[idx++] = rc;
844                 }
845         }
846 
847         ret = -EFAULT;
848         if (copy_to_user(useraddr, &info, sizeof(info)))
849                 goto out;
850 
851         useraddr += offsetof(struct ethtool_sset_info, data);
852         if (copy_to_user(useraddr, info_buf, idx * sizeof(u32)))
853                 goto out;
854 
855         ret = 0;
856 
857 out:
858         kfree(info_buf);
859         return ret;
860 }
861 
862 static noinline_for_stack int ethtool_set_rxnfc(struct net_device *dev,
863                                                 u32 cmd, void __user *useraddr)
864 {
865         struct ethtool_rxnfc info;
866         size_t info_size = sizeof(info);
867         int rc;
868 
869         if (!dev->ethtool_ops->set_rxnfc)
870                 return -EOPNOTSUPP;
871 
872         /* struct ethtool_rxnfc was originally defined for
873          * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
874          * members.  User-space might still be using that
875          * definition. */
876         if (cmd == ETHTOOL_SRXFH)
877                 info_size = (offsetof(struct ethtool_rxnfc, data) +
878                              sizeof(info.data));
879 
880         if (copy_from_user(&info, useraddr, info_size))
881                 return -EFAULT;
882 
883         rc = dev->ethtool_ops->set_rxnfc(dev, &info);
884         if (rc)
885                 return rc;
886 
887         if (cmd == ETHTOOL_SRXCLSRLINS &&
888             copy_to_user(useraddr, &info, info_size))
889                 return -EFAULT;
890 
891         return 0;
892 }
893 
894 static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,
895                                                 u32 cmd, void __user *useraddr)
896 {
897         struct ethtool_rxnfc info;
898         size_t info_size = sizeof(info);
899         const struct ethtool_ops *ops = dev->ethtool_ops;
900         int ret;
901         void *rule_buf = NULL;
902 
903         if (!ops->get_rxnfc)
904                 return -EOPNOTSUPP;
905 
906         /* struct ethtool_rxnfc was originally defined for
907          * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
908          * members.  User-space might still be using that
909          * definition. */
910         if (cmd == ETHTOOL_GRXFH)
911                 info_size = (offsetof(struct ethtool_rxnfc, data) +
912                              sizeof(info.data));
913 
914         if (copy_from_user(&info, useraddr, info_size))
915                 return -EFAULT;
916 
917         /* If FLOW_RSS was requested then user-space must be using the
918          * new definition, as FLOW_RSS is newer.
919          */
920         if (cmd == ETHTOOL_GRXFH && info.flow_type & FLOW_RSS) {
921                 info_size = sizeof(info);
922                 if (copy_from_user(&info, useraddr, info_size))
923                         return -EFAULT;
924                 /* Since malicious users may modify the original data,
925                  * we need to check whether FLOW_RSS is still requested.
926                  */
927                 if (!(info.flow_type & FLOW_RSS))
928                         return -EINVAL;
929         }
930 
931         if (info.cmd != cmd)
932                 return -EINVAL;
933 
934         if (info.cmd == ETHTOOL_GRXCLSRLALL) {
935                 if (info.rule_cnt > 0) {
936                         if (info.rule_cnt <= KMALLOC_MAX_SIZE / sizeof(u32))
937                                 rule_buf = kcalloc(info.rule_cnt, sizeof(u32),
938                                                    GFP_USER);
939                         if (!rule_buf)
940                                 return -ENOMEM;
941                 }
942         }
943 
944         ret = ops->get_rxnfc(dev, &info, rule_buf);
945         if (ret < 0)
946                 goto err_out;
947 
948         ret = -EFAULT;
949         if (copy_to_user(useraddr, &info, info_size))
950                 goto err_out;
951 
952         if (rule_buf) {
953                 useraddr += offsetof(struct ethtool_rxnfc, rule_locs);
954                 if (copy_to_user(useraddr, rule_buf,
955                                  info.rule_cnt * sizeof(u32)))
956                         goto err_out;
957         }
958         ret = 0;
959 
960 err_out:
961         kfree(rule_buf);
962 
963         return ret;
964 }
965 
966 static int ethtool_copy_validate_indir(u32 *indir, void __user *useraddr,
967                                         struct ethtool_rxnfc *rx_rings,
968                                         u32 size)
969 {
970         int i;
971 
972         if (copy_from_user(indir, useraddr, size * sizeof(indir[0])))
973                 return -EFAULT;
974 
975         /* Validate ring indices */
976         for (i = 0; i < size; i++)
977                 if (indir[i] >= rx_rings->data)
978                         return -EINVAL;
979 
980         return 0;
981 }
982 
983 u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly;
984 
985 void netdev_rss_key_fill(void *buffer, size_t len)
986 {
987         BUG_ON(len > sizeof(netdev_rss_key));
988         net_get_random_once(netdev_rss_key, sizeof(netdev_rss_key));
989         memcpy(buffer, netdev_rss_key, len);
990 }
991 EXPORT_SYMBOL(netdev_rss_key_fill);
992 
993 static int ethtool_get_max_rxfh_channel(struct net_device *dev, u32 *max)
994 {
995         u32 dev_size, current_max = 0;
996         u32 *indir;
997         int ret;
998 
999         if (!dev->ethtool_ops->get_rxfh_indir_size ||
1000             !dev->ethtool_ops->get_rxfh)
1001                 return -EOPNOTSUPP;
1002         dev_size = dev->ethtool_ops->get_rxfh_indir_size(dev);
1003         if (dev_size == 0)
1004                 return -EOPNOTSUPP;
1005 
1006         indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
1007         if (!indir)
1008                 return -ENOMEM;
1009 
1010         ret = dev->ethtool_ops->get_rxfh(dev, indir, NULL, NULL);
1011         if (ret)
1012                 goto out;
1013 
1014         while (dev_size--)
1015                 current_max = max(current_max, indir[dev_size]);
1016 
1017         *max = current_max;
1018 
1019 out:
1020         kfree(indir);
1021         return ret;
1022 }
1023 
1024 static noinline_for_stack int ethtool_get_rxfh_indir(struct net_device *dev,
1025                                                      void __user *useraddr)
1026 {
1027         u32 user_size, dev_size;
1028         u32 *indir;
1029         int ret;
1030 
1031         if (!dev->ethtool_ops->get_rxfh_indir_size ||
1032             !dev->ethtool_ops->get_rxfh)
1033                 return -EOPNOTSUPP;
1034         dev_size = dev->ethtool_ops->get_rxfh_indir_size(dev);
1035         if (dev_size == 0)
1036                 return -EOPNOTSUPP;
1037 
1038         if (copy_from_user(&user_size,
1039                            useraddr + offsetof(struct ethtool_rxfh_indir, size),
1040                            sizeof(user_size)))
1041                 return -EFAULT;
1042 
1043         if (copy_to_user(useraddr + offsetof(struct ethtool_rxfh_indir, size),
1044                          &dev_size, sizeof(dev_size)))
1045                 return -EFAULT;
1046 
1047         /* If the user buffer size is 0, this is just a query for the
1048          * device table size.  Otherwise, if it's smaller than the
1049          * device table size it's an error.
1050          */
1051         if (user_size < dev_size)
1052                 return user_size == 0 ? 0 : -EINVAL;
1053 
1054         indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
1055         if (!indir)
1056                 return -ENOMEM;
1057 
1058         ret = dev->ethtool_ops->get_rxfh(dev, indir, NULL, NULL);
1059         if (ret)
1060                 goto out;
1061 
1062         if (copy_to_user(useraddr +
1063                          offsetof(struct ethtool_rxfh_indir, ring_index[0]),
1064                          indir, dev_size * sizeof(indir[0])))
1065                 ret = -EFAULT;
1066 
1067 out:
1068         kfree(indir);
1069         return ret;
1070 }
1071 
1072 static noinline_for_stack int ethtool_set_rxfh_indir(struct net_device *dev,
1073                                                      void __user *useraddr)
1074 {
1075         struct ethtool_rxnfc rx_rings;
1076         u32 user_size, dev_size, i;
1077         u32 *indir;
1078         const struct ethtool_ops *ops = dev->ethtool_ops;
1079         int ret;
1080         u32 ringidx_offset = offsetof(struct ethtool_rxfh_indir, ring_index[0]);
1081 
1082         if (!ops->get_rxfh_indir_size || !ops->set_rxfh ||
1083             !ops->get_rxnfc)
1084                 return -EOPNOTSUPP;
1085 
1086         dev_size = ops->get_rxfh_indir_size(dev);
1087         if (dev_size == 0)
1088                 return -EOPNOTSUPP;
1089 
1090         if (copy_from_user(&user_size,
1091                            useraddr + offsetof(struct ethtool_rxfh_indir, size),
1092                            sizeof(user_size)))
1093                 return -EFAULT;
1094 
1095         if (user_size != 0 && user_size != dev_size)
1096                 return -EINVAL;
1097 
1098         indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
1099         if (!indir)
1100                 return -ENOMEM;
1101 
1102         rx_rings.cmd = ETHTOOL_GRXRINGS;
1103         ret = ops->get_rxnfc(dev, &rx_rings, NULL);
1104         if (ret)
1105                 goto out;
1106 
1107         if (user_size == 0) {
1108                 for (i = 0; i < dev_size; i++)
1109                         indir[i] = ethtool_rxfh_indir_default(i, rx_rings.data);
1110         } else {
1111                 ret = ethtool_copy_validate_indir(indir,
1112                                                   useraddr + ringidx_offset,
1113                                                   &rx_rings,
1114                                                   dev_size);
1115                 if (ret)
1116                         goto out;
1117         }
1118 
1119         ret = ops->set_rxfh(dev, indir, NULL, ETH_RSS_HASH_NO_CHANGE);
1120         if (ret)
1121                 goto out;
1122 
1123         /* indicate whether rxfh was set to default */
1124         if (user_size == 0)
1125                 dev->priv_flags &= ~IFF_RXFH_CONFIGURED;
1126         else
1127                 dev->priv_flags |= IFF_RXFH_CONFIGURED;
1128 
1129 out:
1130         kfree(indir);
1131         return ret;
1132 }
1133 
1134 static noinline_for_stack int ethtool_get_rxfh(struct net_device *dev,
1135                                                void __user *useraddr)
1136 {
1137         int ret;
1138         const struct ethtool_ops *ops = dev->ethtool_ops;
1139         u32 user_indir_size, user_key_size;
1140         u32 dev_indir_size = 0, dev_key_size = 0;
1141         struct ethtool_rxfh rxfh;
1142         u32 total_size;
1143         u32 indir_bytes;
1144         u32 *indir = NULL;
1145         u8 dev_hfunc = 0;
1146         u8 *hkey = NULL;
1147         u8 *rss_config;
1148 
1149         if (!ops->get_rxfh)
1150                 return -EOPNOTSUPP;
1151 
1152         if (ops->get_rxfh_indir_size)
1153                 dev_indir_size = ops->get_rxfh_indir_size(dev);
1154         if (ops->get_rxfh_key_size)
1155                 dev_key_size = ops->get_rxfh_key_size(dev);
1156 
1157         if (copy_from_user(&rxfh, useraddr, sizeof(rxfh)))
1158                 return -EFAULT;
1159         user_indir_size = rxfh.indir_size;
1160         user_key_size = rxfh.key_size;
1161 
1162         /* Check that reserved fields are 0 for now */
1163         if (rxfh.rsvd8[0] || rxfh.rsvd8[1] || rxfh.rsvd8[2] || rxfh.rsvd32)
1164                 return -EINVAL;
1165         /* Most drivers don't handle rss_context, check it's 0 as well */
1166         if (rxfh.rss_context && !ops->get_rxfh_context)
1167                 return -EOPNOTSUPP;
1168 
1169         rxfh.indir_size = dev_indir_size;
1170         rxfh.key_size = dev_key_size;
1171         if (copy_to_user(useraddr, &rxfh, sizeof(rxfh)))
1172                 return -EFAULT;
1173 
1174         if ((user_indir_size && (user_indir_size != dev_indir_size)) ||
1175             (user_key_size && (user_key_size != dev_key_size)))
1176                 return -EINVAL;
1177 
1178         indir_bytes = user_indir_size * sizeof(indir[0]);
1179         total_size = indir_bytes + user_key_size;
1180         rss_config = kzalloc(total_size, GFP_USER);
1181         if (!rss_config)
1182                 return -ENOMEM;
1183 
1184         if (user_indir_size)
1185                 indir = (u32 *)rss_config;
1186 
1187         if (user_key_size)
1188                 hkey = rss_config + indir_bytes;
1189 
1190         if (rxfh.rss_context)
1191                 ret = dev->ethtool_ops->get_rxfh_context(dev, indir, hkey,
1192                                                          &dev_hfunc,
1193                                                          rxfh.rss_context);
1194         else
1195                 ret = dev->ethtool_ops->get_rxfh(dev, indir, hkey, &dev_hfunc);
1196         if (ret)
1197                 goto out;
1198 
1199         if (copy_to_user(useraddr + offsetof(struct ethtool_rxfh, hfunc),
1200                          &dev_hfunc, sizeof(rxfh.hfunc))) {
1201                 ret = -EFAULT;
1202         } else if (copy_to_user(useraddr +
1203                               offsetof(struct ethtool_rxfh, rss_config[0]),
1204                               rss_config, total_size)) {
1205                 ret = -EFAULT;
1206         }
1207 out:
1208         kfree(rss_config);
1209 
1210         return ret;
1211 }
1212 
1213 static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
1214                                                void __user *useraddr)
1215 {
1216         int ret;
1217         const struct ethtool_ops *ops = dev->ethtool_ops;
1218         struct ethtool_rxnfc rx_rings;
1219         struct ethtool_rxfh rxfh;
1220         u32 dev_indir_size = 0, dev_key_size = 0, i;
1221         u32 *indir = NULL, indir_bytes = 0;
1222         u8 *hkey = NULL;
1223         u8 *rss_config;
1224         u32 rss_cfg_offset = offsetof(struct ethtool_rxfh, rss_config[0]);
1225         bool delete = false;
1226 
1227         if (!ops->get_rxnfc || !ops->set_rxfh)
1228                 return -EOPNOTSUPP;
1229 
1230         if (ops->get_rxfh_indir_size)
1231                 dev_indir_size = ops->get_rxfh_indir_size(dev);
1232         if (ops->get_rxfh_key_size)
1233                 dev_key_size = ops->get_rxfh_key_size(dev);
1234 
1235         if (copy_from_user(&rxfh, useraddr, sizeof(rxfh)))
1236                 return -EFAULT;
1237 
1238         /* Check that reserved fields are 0 for now */
1239         if (rxfh.rsvd8[0] || rxfh.rsvd8[1] || rxfh.rsvd8[2] || rxfh.rsvd32)
1240                 return -EINVAL;
1241         /* Most drivers don't handle rss_context, check it's 0 as well */
1242         if (rxfh.rss_context && !ops->set_rxfh_context)
1243                 return -EOPNOTSUPP;
1244 
1245         /* If either indir, hash key or function is valid, proceed further.
1246          * Must request at least one change: indir size, hash key or function.
1247          */
1248         if ((rxfh.indir_size &&
1249              rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE &&
1250              rxfh.indir_size != dev_indir_size) ||
1251             (rxfh.key_size && (rxfh.key_size != dev_key_size)) ||
1252             (rxfh.indir_size == ETH_RXFH_INDIR_NO_CHANGE &&
1253              rxfh.key_size == 0 && rxfh.hfunc == ETH_RSS_HASH_NO_CHANGE))
1254                 return -EINVAL;
1255 
1256         if (rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE)
1257                 indir_bytes = dev_indir_size * sizeof(indir[0]);
1258 
1259         rss_config = kzalloc(indir_bytes + rxfh.key_size, GFP_USER);
1260         if (!rss_config)
1261                 return -ENOMEM;
1262 
1263         rx_rings.cmd = ETHTOOL_GRXRINGS;
1264         ret = ops->get_rxnfc(dev, &rx_rings, NULL);
1265         if (ret)
1266                 goto out;
1267 
1268         /* rxfh.indir_size == 0 means reset the indir table to default (master
1269          * context) or delete the context (other RSS contexts).
1270          * rxfh.indir_size == ETH_RXFH_INDIR_NO_CHANGE means leave it unchanged.
1271          */
1272         if (rxfh.indir_size &&
1273             rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE) {
1274                 indir = (u32 *)rss_config;
1275                 ret = ethtool_copy_validate_indir(indir,
1276                                                   useraddr + rss_cfg_offset,
1277                                                   &rx_rings,
1278                                                   rxfh.indir_size);
1279                 if (ret)
1280                         goto out;
1281         } else if (rxfh.indir_size == 0) {
1282                 if (rxfh.rss_context == 0) {
1283                         indir = (u32 *)rss_config;
1284                         for (i = 0; i < dev_indir_size; i++)
1285                                 indir[i] = ethtool_rxfh_indir_default(i, rx_rings.data);
1286                 } else {
1287                         delete = true;
1288                 }
1289         }
1290 
1291         if (rxfh.key_size) {
1292                 hkey = rss_config + indir_bytes;
1293                 if (copy_from_user(hkey,
1294                                    useraddr + rss_cfg_offset + indir_bytes,
1295                                    rxfh.key_size)) {
1296                         ret = -EFAULT;
1297                         goto out;
1298                 }
1299         }
1300 
1301         if (rxfh.rss_context)
1302                 ret = ops->set_rxfh_context(dev, indir, hkey, rxfh.hfunc,
1303                                             &rxfh.rss_context, delete);
1304         else
1305                 ret = ops->set_rxfh(dev, indir, hkey, rxfh.hfunc);
1306         if (ret)
1307                 goto out;
1308 
1309         if (copy_to_user(useraddr + offsetof(struct ethtool_rxfh, rss_context),
1310                          &rxfh.rss_context, sizeof(rxfh.rss_context)))
1311                 ret = -EFAULT;
1312 
1313         if (!rxfh.rss_context) {
1314                 /* indicate whether rxfh was set to default */
1315                 if (rxfh.indir_size == 0)
1316                         dev->priv_flags &= ~IFF_RXFH_CONFIGURED;
1317                 else if (rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE)
1318                         dev->priv_flags |= IFF_RXFH_CONFIGURED;
1319         }
1320 
1321 out:
1322         kfree(rss_config);
1323         return ret;
1324 }
1325 
1326 static int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
1327 {
1328         struct ethtool_regs regs;
1329         const struct ethtool_ops *ops = dev->ethtool_ops;
1330         void *regbuf;
1331         int reglen, ret;
1332 
1333         if (!ops->get_regs || !ops->get_regs_len)
1334                 return -EOPNOTSUPP;
1335 
1336         if (copy_from_user(&regs, useraddr, sizeof(regs)))
1337                 return -EFAULT;
1338 
1339         reglen = ops->get_regs_len(dev);
1340         if (regs.len > reglen)
1341                 regs.len = reglen;
1342 
1343         regbuf = NULL;
1344         if (reglen) {
1345                 regbuf = vzalloc(reglen);
1346                 if (!regbuf)
1347                         return -ENOMEM;
1348         }
1349 
1350         ops->get_regs(dev, &regs, regbuf);
1351 
1352         ret = -EFAULT;
1353         if (copy_to_user(useraddr, &regs, sizeof(regs)))
1354                 goto out;
1355         useraddr += offsetof(struct ethtool_regs, data);
1356         if (regbuf && copy_to_user(useraddr, regbuf, regs.len))
1357                 goto out;
1358         ret = 0;
1359 
1360  out:
1361         vfree(regbuf);
1362         return ret;
1363 }
1364 
1365 static int ethtool_reset(struct net_device *dev, char __user *useraddr)
1366 {
1367         struct ethtool_value reset;
1368         int ret;
1369 
1370         if (!dev->ethtool_ops->reset)
1371                 return -EOPNOTSUPP;
1372 
1373         if (copy_from_user(&reset, useraddr, sizeof(reset)))
1374                 return -EFAULT;
1375 
1376         ret = dev->ethtool_ops->reset(dev, &reset.data);
1377         if (ret)
1378                 return ret;
1379 
1380         if (copy_to_user(useraddr, &reset, sizeof(reset)))
1381                 return -EFAULT;
1382         return 0;
1383 }
1384 
1385 static int ethtool_get_wol(struct net_device *dev, char __user *useraddr)
1386 {
1387         struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
1388 
1389         if (!dev->ethtool_ops->get_wol)
1390                 return -EOPNOTSUPP;
1391 
1392         dev->ethtool_ops->get_wol(dev, &wol);
1393 
1394         if (copy_to_user(useraddr, &wol, sizeof(wol)))
1395                 return -EFAULT;
1396         return 0;
1397 }
1398 
1399 static int ethtool_set_wol(struct net_device *dev, char __user *useraddr)
1400 {
1401         struct ethtool_wolinfo wol;
1402         int ret;
1403 
1404         if (!dev->ethtool_ops->set_wol)
1405                 return -EOPNOTSUPP;
1406 
1407         if (copy_from_user(&wol, useraddr, sizeof(wol)))
1408                 return -EFAULT;
1409 
1410         ret = dev->ethtool_ops->set_wol(dev, &wol);
1411         if (ret)
1412                 return ret;
1413 
1414         dev->wol_enabled = !!wol.wolopts;
1415 
1416         return 0;
1417 }
1418 
1419 static int ethtool_get_eee(struct net_device *dev, char __user *useraddr)
1420 {
1421         struct ethtool_eee edata;
1422         int rc;
1423 
1424         if (!dev->ethtool_ops->get_eee)
1425                 return -EOPNOTSUPP;
1426 
1427         memset(&edata, 0, sizeof(struct ethtool_eee));
1428         edata.cmd = ETHTOOL_GEEE;
1429         rc = dev->ethtool_ops->get_eee(dev, &edata);
1430 
1431         if (rc)
1432                 return rc;
1433 
1434         if (copy_to_user(useraddr, &edata, sizeof(edata)))
1435                 return -EFAULT;
1436 
1437         return 0;
1438 }
1439 
1440 static int ethtool_set_eee(struct net_device *dev, char __user *useraddr)
1441 {
1442         struct ethtool_eee edata;
1443 
1444         if (!dev->ethtool_ops->set_eee)
1445                 return -EOPNOTSUPP;
1446 
1447         if (copy_from_user(&edata, useraddr, sizeof(edata)))
1448                 return -EFAULT;
1449 
1450         return dev->ethtool_ops->set_eee(dev, &edata);
1451 }
1452 
1453 static int ethtool_nway_reset(struct net_device *dev)
1454 {
1455         if (!dev->ethtool_ops->nway_reset)
1456                 return -EOPNOTSUPP;
1457 
1458         return dev->ethtool_ops->nway_reset(dev);
1459 }
1460 
1461 static int ethtool_get_link(struct net_device *dev, char __user *useraddr)
1462 {
1463         struct ethtool_value edata = { .cmd = ETHTOOL_GLINK };
1464 
1465         if (!dev->ethtool_ops->get_link)
1466                 return -EOPNOTSUPP;
1467 
1468         edata.data = netif_running(dev) && dev->ethtool_ops->get_link(dev);
1469 
1470         if (copy_to_user(useraddr, &edata, sizeof(edata)))
1471                 return -EFAULT;
1472         return 0;
1473 }
1474 
1475 static int ethtool_get_any_eeprom(struct net_device *dev, void __user *useraddr,
1476                                   int (*getter)(struct net_device *,
1477                                                 struct ethtool_eeprom *, u8 *),
1478                                   u32 total_len)
1479 {
1480         struct ethtool_eeprom eeprom;
1481         void __user *userbuf = useraddr + sizeof(eeprom);
1482         u32 bytes_remaining;
1483         u8 *data;
1484         int ret = 0;
1485 
1486         if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
1487                 return -EFAULT;
1488 
1489         /* Check for wrap and zero */
1490         if (eeprom.offset + eeprom.len <= eeprom.offset)
1491                 return -EINVAL;
1492 
1493         /* Check for exceeding total eeprom len */
1494         if (eeprom.offset + eeprom.len > total_len)
1495                 return -EINVAL;
1496 
1497         data = kmalloc(PAGE_SIZE, GFP_USER);
1498         if (!data)
1499                 return -ENOMEM;
1500 
1501         bytes_remaining = eeprom.len;
1502         while (bytes_remaining > 0) {
1503                 eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);
1504 
1505                 ret = getter(dev, &eeprom, data);
1506                 if (ret)
1507                         break;
1508                 if (copy_to_user(userbuf, data, eeprom.len)) {
1509                         ret = -EFAULT;
1510                         break;
1511                 }
1512                 userbuf += eeprom.len;
1513                 eeprom.offset += eeprom.len;
1514                 bytes_remaining -= eeprom.len;
1515         }
1516 
1517         eeprom.len = userbuf - (useraddr + sizeof(eeprom));
1518         eeprom.offset -= eeprom.len;
1519         if (copy_to_user(useraddr, &eeprom, sizeof(eeprom)))
1520                 ret = -EFAULT;
1521 
1522         kfree(data);
1523         return ret;
1524 }
1525 
1526 static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
1527 {
1528         const struct ethtool_ops *ops = dev->ethtool_ops;
1529 
1530         if (!ops->get_eeprom || !ops->get_eeprom_len ||
1531             !ops->get_eeprom_len(dev))
1532                 return -EOPNOTSUPP;
1533 
1534         return ethtool_get_any_eeprom(dev, useraddr, ops->get_eeprom,
1535                                       ops->get_eeprom_len(dev));
1536 }
1537 
1538 static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
1539 {
1540         struct ethtool_eeprom eeprom;
1541         const struct ethtool_ops *ops = dev->ethtool_ops;
1542         void __user *userbuf = useraddr + sizeof(eeprom);
1543         u32 bytes_remaining;
1544         u8 *data;
1545         int ret = 0;
1546 
1547         if (!ops->set_eeprom || !ops->get_eeprom_len ||
1548             !ops->get_eeprom_len(dev))
1549                 return -EOPNOTSUPP;
1550 
1551         if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
1552                 return -EFAULT;
1553 
1554         /* Check for wrap and zero */
1555         if (eeprom.offset + eeprom.len <= eeprom.offset)
1556                 return -EINVAL;
1557 
1558         /* Check for exceeding total eeprom len */
1559         if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
1560                 return -EINVAL;
1561 
1562         data = kmalloc(PAGE_SIZE, GFP_USER);
1563         if (!data)
1564                 return -ENOMEM;
1565 
1566         bytes_remaining = eeprom.len;
1567         while (bytes_remaining > 0) {
1568                 eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);
1569 
1570                 if (copy_from_user(data, userbuf, eeprom.len)) {
1571                         ret = -EFAULT;
1572                         break;
1573                 }
1574                 ret = ops->set_eeprom(dev, &eeprom, data);
1575                 if (ret)
1576                         break;
1577                 userbuf += eeprom.len;
1578                 eeprom.offset += eeprom.len;
1579                 bytes_remaining -= eeprom.len;
1580         }
1581 
1582         kfree(data);
1583         return ret;
1584 }
1585 
1586 static noinline_for_stack int ethtool_get_coalesce(struct net_device *dev,
1587                                                    void __user *useraddr)
1588 {
1589         struct ethtool_coalesce coalesce = { .cmd = ETHTOOL_GCOALESCE };
1590 
1591         if (!dev->ethtool_ops->get_coalesce)
1592                 return -EOPNOTSUPP;
1593 
1594         dev->ethtool_ops->get_coalesce(dev, &coalesce);
1595 
1596         if (copy_to_user(useraddr, &coalesce, sizeof(coalesce)))
1597                 return -EFAULT;
1598         return 0;
1599 }
1600 
1601 static noinline_for_stack int ethtool_set_coalesce(struct net_device *dev,
1602                                                    void __user *useraddr)
1603 {
1604         struct ethtool_coalesce coalesce;
1605 
1606         if (!dev->ethtool_ops->set_coalesce)
1607                 return -EOPNOTSUPP;
1608 
1609         if (copy_from_user(&coalesce, useraddr, sizeof(coalesce)))
1610                 return -EFAULT;
1611 
1612         return dev->ethtool_ops->set_coalesce(dev, &coalesce);
1613 }
1614 
1615 static int ethtool_get_ringparam(struct net_device *dev, void __user *useraddr)
1616 {
1617         struct ethtool_ringparam ringparam = { .cmd = ETHTOOL_GRINGPARAM };
1618 
1619         if (!dev->ethtool_ops->get_ringparam)
1620                 return -EOPNOTSUPP;
1621 
1622         dev->ethtool_ops->get_ringparam(dev, &ringparam);
1623 
1624         if (copy_to_user(useraddr, &ringparam, sizeof(ringparam)))
1625                 return -EFAULT;
1626         return 0;
1627 }
1628 
1629 static int ethtool_set_ringparam(struct net_device *dev, void __user *useraddr)
1630 {
1631         struct ethtool_ringparam ringparam, max = { .cmd = ETHTOOL_GRINGPARAM };
1632 
1633         if (!dev->ethtool_ops->set_ringparam || !dev->ethtool_ops->get_ringparam)
1634                 return -EOPNOTSUPP;
1635 
1636         if (copy_from_user(&ringparam, useraddr, sizeof(ringparam)))
1637                 return -EFAULT;
1638 
1639         dev->ethtool_ops->get_ringparam(dev, &max);
1640 
1641         /* ensure new ring parameters are within the maximums */
1642         if (ringparam.rx_pending > max.rx_max_pending ||
1643             ringparam.rx_mini_pending > max.rx_mini_max_pending ||
1644             ringparam.rx_jumbo_pending > max.rx_jumbo_max_pending ||
1645             ringparam.tx_pending > max.tx_max_pending)
1646                 return -EINVAL;
1647 
1648         return dev->ethtool_ops->set_ringparam(dev, &ringparam);
1649 }
1650 
1651 static noinline_for_stack int ethtool_get_channels(struct net_device *dev,
1652                                                    void __user *useraddr)
1653 {
1654         struct ethtool_channels channels = { .cmd = ETHTOOL_GCHANNELS };
1655 
1656         if (!dev->ethtool_ops->get_channels)
1657                 return -EOPNOTSUPP;
1658 
1659         dev->ethtool_ops->get_channels(dev, &channels);
1660 
1661         if (copy_to_user(useraddr, &channels, sizeof(channels)))
1662                 return -EFAULT;
1663         return 0;
1664 }
1665 
1666 static noinline_for_stack int ethtool_set_channels(struct net_device *dev,
1667                                                    void __user *useraddr)
1668 {
1669         struct ethtool_channels channels, curr = { .cmd = ETHTOOL_GCHANNELS };
1670         u16 from_channel, to_channel;
1671         u32 max_rx_in_use = 0;
1672         unsigned int i;
1673 
1674         if (!dev->ethtool_ops->set_channels || !dev->ethtool_ops->get_channels)
1675                 return -EOPNOTSUPP;
1676 
1677         if (copy_from_user(&channels, useraddr, sizeof(channels)))
1678                 return -EFAULT;
1679 
1680         dev->ethtool_ops->get_channels(dev, &curr);
1681 
1682         /* ensure new counts are within the maximums */
1683         if (channels.rx_count > curr.max_rx ||
1684             channels.tx_count > curr.max_tx ||
1685             channels.combined_count > curr.max_combined ||
1686             channels.other_count > curr.max_other)
1687                 return -EINVAL;
1688 
1689         /* ensure the new Rx count fits within the configured Rx flow
1690          * indirection table settings */
1691         if (netif_is_rxfh_configured(dev) &&
1692             !ethtool_get_max_rxfh_channel(dev, &max_rx_in_use) &&
1693             (channels.combined_count + channels.rx_count) <= max_rx_in_use)
1694             return -EINVAL;
1695 
1696         /* Disabling channels, query zero-copy AF_XDP sockets */
1697         from_channel = channels.combined_count +
1698                 min(channels.rx_count, channels.tx_count);
1699         to_channel = curr.combined_count + max(curr.rx_count, curr.tx_count);
1700         for (i = from_channel; i < to_channel; i++)
1701                 if (xdp_get_umem_from_qid(dev, i))
1702                         return -EINVAL;
1703 
1704         return dev->ethtool_ops->set_channels(dev, &channels);
1705 }
1706 
1707 static int ethtool_get_pauseparam(struct net_device *dev, void __user *useraddr)
1708 {
1709         struct ethtool_pauseparam pauseparam = { ETHTOOL_GPAUSEPARAM };
1710 
1711         if (!dev->ethtool_ops->get_pauseparam)
1712                 return -EOPNOTSUPP;
1713 
1714         dev->ethtool_ops->get_pauseparam(dev, &pauseparam);
1715 
1716         if (copy_to_user(useraddr, &pauseparam, sizeof(pauseparam)))
1717                 return -EFAULT;
1718         return 0;
1719 }
1720 
1721 static int ethtool_set_pauseparam(struct net_device *dev, void __user *useraddr)
1722 {
1723         struct ethtool_pauseparam pauseparam;
1724 
1725         if (!dev->ethtool_ops->set_pauseparam)
1726                 return -EOPNOTSUPP;
1727 
1728         if (copy_from_user(&pauseparam, useraddr, sizeof(pauseparam)))
1729                 return -EFAULT;
1730 
1731         return dev->ethtool_ops->set_pauseparam(dev, &pauseparam);
1732 }
1733 
1734 static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
1735 {
1736         struct ethtool_test test;
1737         const struct ethtool_ops *ops = dev->ethtool_ops;
1738         u64 *data;
1739         int ret, test_len;
1740 
1741         if (!ops->self_test || !ops->get_sset_count)
1742                 return -EOPNOTSUPP;
1743 
1744         test_len = ops->get_sset_count(dev, ETH_SS_TEST);
1745         if (test_len < 0)
1746                 return test_len;
1747         WARN_ON(test_len == 0);
1748 
1749         if (copy_from_user(&test, useraddr, sizeof(test)))
1750                 return -EFAULT;
1751 
1752         test.len = test_len;
1753         data = kmalloc_array(test_len, sizeof(u64), GFP_USER);
1754         if (!data)
1755                 return -ENOMEM;
1756 
1757         ops->self_test(dev, &test, data);
1758 
1759         ret = -EFAULT;
1760         if (copy_to_user(useraddr, &test, sizeof(test)))
1761                 goto out;
1762         useraddr += sizeof(test);
1763         if (copy_to_user(useraddr, data, test.len * sizeof(u64)))
1764                 goto out;
1765         ret = 0;
1766 
1767  out:
1768         kfree(data);
1769         return ret;
1770 }
1771 
1772 static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
1773 {
1774         struct ethtool_gstrings gstrings;
1775         u8 *data;
1776         int ret;
1777 
1778         if (copy_from_user(&gstrings, useraddr, sizeof(gstrings)))
1779                 return -EFAULT;
1780 
1781         ret = __ethtool_get_sset_count(dev, gstrings.string_set);
1782         if (ret < 0)
1783                 return ret;
1784         if (ret > S32_MAX / ETH_GSTRING_LEN)
1785                 return -ENOMEM;
1786         WARN_ON_ONCE(!ret);
1787 
1788         gstrings.len = ret;
1789         data = vzalloc(array_size(gstrings.len, ETH_GSTRING_LEN));
1790         if (gstrings.len && !data)
1791                 return -ENOMEM;
1792 
1793         __ethtool_get_strings(dev, gstrings.string_set, data);
1794 
1795         ret = -EFAULT;
1796         if (copy_to_user(useraddr, &gstrings, sizeof(gstrings)))
1797                 goto out;
1798         useraddr += sizeof(gstrings);
1799         if (gstrings.len &&
1800             copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))
1801                 goto out;
1802         ret = 0;
1803 
1804 out:
1805         vfree(data);
1806         return ret;
1807 }
1808 
1809 static int ethtool_phys_id(struct net_device *dev, void __user *useraddr)
1810 {
1811         struct ethtool_value id;
1812         static bool busy;
1813         const struct ethtool_ops *ops = dev->ethtool_ops;
1814         int rc;
1815 
1816         if (!ops->set_phys_id)
1817                 return -EOPNOTSUPP;
1818 
1819         if (busy)
1820                 return -EBUSY;
1821 
1822         if (copy_from_user(&id, useraddr, sizeof(id)))
1823                 return -EFAULT;
1824 
1825         rc = ops->set_phys_id(dev, ETHTOOL_ID_ACTIVE);
1826         if (rc < 0)
1827                 return rc;
1828 
1829         /* Drop the RTNL lock while waiting, but prevent reentry or
1830          * removal of the device.
1831          */
1832         busy = true;
1833         dev_hold(dev);
1834         rtnl_unlock();
1835 
1836         if (rc == 0) {
1837                 /* Driver will handle this itself */
1838                 schedule_timeout_interruptible(
1839                         id.data ? (id.data * HZ) : MAX_SCHEDULE_TIMEOUT);
1840         } else {
1841                 /* Driver expects to be called at twice the frequency in rc */
1842                 int n = rc * 2, i, interval = HZ / n;
1843 
1844                 /* Count down seconds */
1845                 do {
1846                         /* Count down iterations per second */
1847                         i = n;
1848                         do {
1849                                 rtnl_lock();
1850                                 rc = ops->set_phys_id(dev,
1851                                     (i & 1) ? ETHTOOL_ID_OFF : ETHTOOL_ID_ON);
1852                                 rtnl_unlock();
1853                                 if (rc)
1854                                         break;
1855                                 schedule_timeout_interruptible(interval);
1856                         } while (!signal_pending(current) && --i != 0);
1857                 } while (!signal_pending(current) &&
1858                          (id.data == 0 || --id.data != 0));
1859         }
1860 
1861         rtnl_lock();
1862         dev_put(dev);
1863         busy = false;
1864 
1865         (void) ops->set_phys_id(dev, ETHTOOL_ID_INACTIVE);
1866         return rc;
1867 }
1868 
1869 static int ethtool_get_stats(struct net_device *dev, void __user *useraddr)
1870 {
1871         struct ethtool_stats stats;
1872         const struct ethtool_ops *ops = dev->ethtool_ops;
1873         u64 *data;
1874         int ret, n_stats;
1875 
1876         if (!ops->get_ethtool_stats || !ops->get_sset_count)
1877                 return -EOPNOTSUPP;
1878 
1879         n_stats = ops->get_sset_count(dev, ETH_SS_STATS);
1880         if (n_stats < 0)
1881                 return n_stats;
1882         if (n_stats > S32_MAX / sizeof(u64))
1883                 return -ENOMEM;
1884         WARN_ON_ONCE(!n_stats);
1885         if (copy_from_user(&stats, useraddr, sizeof(stats)))
1886                 return -EFAULT;
1887 
1888         stats.n_stats = n_stats;
1889         data = vzalloc(array_size(n_stats, sizeof(u64)));
1890         if (n_stats && !data)
1891                 return -ENOMEM;
1892 
1893         ops->get_ethtool_stats(dev, &stats, data);
1894 
1895         ret = -EFAULT;
1896         if (copy_to_user(useraddr, &stats, sizeof(stats)))
1897                 goto out;
1898         useraddr += sizeof(stats);
1899         if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
1900                 goto out;
1901         ret = 0;
1902 
1903  out:
1904         vfree(data);
1905         return ret;
1906 }
1907 
1908 static int ethtool_get_phy_stats(struct net_device *dev, void __user *useraddr)
1909 {
1910         const struct ethtool_ops *ops = dev->ethtool_ops;
1911         struct phy_device *phydev = dev->phydev;
1912         struct ethtool_stats stats;
1913         u64 *data;
1914         int ret, n_stats;
1915 
1916         if (!phydev && (!ops->get_ethtool_phy_stats || !ops->get_sset_count))
1917                 return -EOPNOTSUPP;
1918 
1919         if (dev->phydev && !ops->get_ethtool_phy_stats)
1920                 n_stats = phy_ethtool_get_sset_count(dev->phydev);
1921         else
1922                 n_stats = ops->get_sset_count(dev, ETH_SS_PHY_STATS);
1923         if (n_stats < 0)
1924                 return n_stats;
1925         if (n_stats > S32_MAX / sizeof(u64))
1926                 return -ENOMEM;
1927         WARN_ON_ONCE(!n_stats);
1928 
1929         if (copy_from_user(&stats, useraddr, sizeof(stats)))
1930                 return -EFAULT;
1931 
1932         stats.n_stats = n_stats;
1933         data = vzalloc(array_size(n_stats, sizeof(u64)));
1934         if (n_stats && !data)
1935                 return -ENOMEM;
1936 
1937         if (dev->phydev && !ops->get_ethtool_phy_stats) {
1938                 ret = phy_ethtool_get_stats(dev->phydev, &stats, data);
1939                 if (ret < 0)
1940                         return ret;
1941         } else {
1942                 ops->get_ethtool_phy_stats(dev, &stats, data);
1943         }
1944 
1945         ret = -EFAULT;
1946         if (copy_to_user(useraddr, &stats, sizeof(stats)))
1947                 goto out;
1948         useraddr += sizeof(stats);
1949         if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
1950                 goto out;
1951         ret = 0;
1952 
1953  out:
1954         vfree(data);
1955         return ret;
1956 }
1957 
1958 static int ethtool_get_perm_addr(struct net_device *dev, void __user *useraddr)
1959 {
1960         struct ethtool_perm_addr epaddr;
1961 
1962         if (copy_from_user(&epaddr, useraddr, sizeof(epaddr)))
1963                 return -EFAULT;
1964 
1965         if (epaddr.size < dev->addr_len)
1966                 return -ETOOSMALL;
1967         epaddr.size = dev->addr_len;
1968 
1969         if (copy_to_user(useraddr, &epaddr, sizeof(epaddr)))
1970                 return -EFAULT;
1971         useraddr += sizeof(epaddr);
1972         if (copy_to_user(useraddr, dev->perm_addr, epaddr.size))
1973                 return -EFAULT;
1974         return 0;
1975 }
1976 
1977 static int ethtool_get_value(struct net_device *dev, char __user *useraddr,
1978                              u32 cmd, u32 (*actor)(struct net_device *))
1979 {
1980         struct ethtool_value edata = { .cmd = cmd };
1981 
1982         if (!actor)
1983                 return -EOPNOTSUPP;
1984 
1985         edata.data = actor(dev);
1986 
1987         if (copy_to_user(useraddr, &edata, sizeof(edata)))
1988                 return -EFAULT;
1989         return 0;
1990 }
1991 
1992 static int ethtool_set_value_void(struct net_device *dev, char __user *useraddr,
1993                              void (*actor)(struct net_device *, u32))
1994 {
1995         struct ethtool_value edata;
1996 
1997         if (!actor)
1998                 return -EOPNOTSUPP;
1999 
2000         if (copy_from_user(&edata, useraddr, sizeof(edata)))
2001                 return -EFAULT;
2002 
2003         actor(dev, edata.data);
2004         return 0;
2005 }
2006 
2007 static int ethtool_set_value(struct net_device *dev, char __user *useraddr,
2008                              int (*actor)(struct net_device *, u32))
2009 {
2010         struct ethtool_value edata;
2011 
2012         if (!actor)
2013                 return -EOPNOTSUPP;
2014 
2015         if (copy_from_user(&edata, useraddr, sizeof(edata)))
2016                 return -EFAULT;
2017 
2018         return actor(dev, edata.data);
2019 }
2020 
2021 static noinline_for_stack int ethtool_flash_device(struct net_device *dev,
2022                                                    char __user *useraddr)
2023 {
2024         struct ethtool_flash efl;
2025 
2026         if (copy_from_user(&efl, useraddr, sizeof(efl)))
2027                 return -EFAULT;
2028 
2029         if (!dev->ethtool_ops->flash_device)
2030                 return -EOPNOTSUPP;
2031 
2032         efl.data[ETHTOOL_FLASH_MAX_FILENAME - 1] = 0;
2033 
2034         return dev->ethtool_ops->flash_device(dev, &efl);
2035 }
2036 
2037 static int ethtool_set_dump(struct net_device *dev,
2038                         void __user *useraddr)
2039 {
2040         struct ethtool_dump dump;
2041 
2042         if (!dev->ethtool_ops->set_dump)
2043                 return -EOPNOTSUPP;
2044 
2045         if (copy_from_user(&dump, useraddr, sizeof(dump)))
2046                 return -EFAULT;
2047 
2048         return dev->ethtool_ops->set_dump(dev, &dump);
2049 }
2050 
2051 static int ethtool_get_dump_flag(struct net_device *dev,
2052                                 void __user *useraddr)
2053 {
2054         int ret;
2055         struct ethtool_dump dump;
2056         const struct ethtool_ops *ops = dev->ethtool_ops;
2057 
2058         if (!ops->get_dump_flag)
2059                 return -EOPNOTSUPP;
2060 
2061         if (copy_from_user(&dump, useraddr, sizeof(dump)))
2062                 return -EFAULT;
2063 
2064         ret = ops->get_dump_flag(dev, &dump);
2065         if (ret)
2066                 return ret;
2067 
2068         if (copy_to_user(useraddr, &dump, sizeof(dump)))
2069                 return -EFAULT;
2070         return 0;
2071 }
2072 
2073 static int ethtool_get_dump_data(struct net_device *dev,
2074                                 void __user *useraddr)
2075 {
2076         int ret;
2077         __u32 len;
2078         struct ethtool_dump dump, tmp;
2079         const struct ethtool_ops *ops = dev->ethtool_ops;
2080         void *data = NULL;
2081 
2082         if (!ops->get_dump_data || !ops->get_dump_flag)
2083                 return -EOPNOTSUPP;
2084 
2085         if (copy_from_user(&dump, useraddr, sizeof(dump)))
2086                 return -EFAULT;
2087 
2088         memset(&tmp, 0, sizeof(tmp));
2089         tmp.cmd = ETHTOOL_GET_DUMP_FLAG;
2090         ret = ops->get_dump_flag(dev, &tmp);
2091         if (ret)
2092                 return ret;
2093 
2094         len = min(tmp.len, dump.len);
2095         if (!len)
2096                 return -EFAULT;
2097 
2098         /* Don't ever let the driver think there's more space available
2099          * than it requested with .get_dump_flag().
2100          */
2101         dump.len = len;
2102 
2103         /* Always allocate enough space to hold the whole thing so that the
2104          * driver does not need to check the length and bother with partial
2105          * dumping.
2106          */
2107         data = vzalloc(tmp.len);
2108         if (!data)
2109                 return -ENOMEM;
2110         ret = ops->get_dump_data(dev, &dump, data);
2111         if (ret)
2112                 goto out;
2113 
2114         /* There are two sane possibilities:
2115          * 1. The driver's .get_dump_data() does not touch dump.len.
2116          * 2. Or it may set dump.len to how much it really writes, which
2117          *    should be tmp.len (or len if it can do a partial dump).
2118          * In any case respond to userspace with the actual length of data
2119          * it's receiving.
2120          */
2121         WARN_ON(dump.len != len && dump.len != tmp.len);
2122         dump.len = len;
2123 
2124         if (copy_to_user(useraddr, &dump, sizeof(dump))) {
2125                 ret = -EFAULT;
2126                 goto out;
2127         }
2128         useraddr += offsetof(struct ethtool_dump, data);
2129         if (copy_to_user(useraddr, data, len))
2130                 ret = -EFAULT;
2131 out:
2132         vfree(data);
2133         return ret;
2134 }
2135 
2136 static int ethtool_get_ts_info(struct net_device *dev, void __user *useraddr)
2137 {
2138         int err = 0;
2139         struct ethtool_ts_info info;
2140         const struct ethtool_ops *ops = dev->ethtool_ops;
2141         struct phy_device *phydev = dev->phydev;
2142 
2143         memset(&info, 0, sizeof(info));
2144         info.cmd = ETHTOOL_GET_TS_INFO;
2145 
2146         if (phydev && phydev->drv && phydev->drv->ts_info) {
2147                 err = phydev->drv->ts_info(phydev, &info);
2148         } else if (ops->get_ts_info) {
2149                 err = ops->get_ts_info(dev, &info);
2150         } else {
2151                 info.so_timestamping =
2152                         SOF_TIMESTAMPING_RX_SOFTWARE |
2153                         SOF_TIMESTAMPING_SOFTWARE;
2154                 info.phc_index = -1;
2155         }
2156 
2157         if (err)
2158                 return err;
2159 
2160         if (copy_to_user(useraddr, &info, sizeof(info)))
2161                 err = -EFAULT;
2162 
2163         return err;
2164 }
2165 
2166 static int __ethtool_get_module_info(struct net_device *dev,
2167                                      struct ethtool_modinfo *modinfo)
2168 {
2169         const struct ethtool_ops *ops = dev->ethtool_ops;
2170         struct phy_device *phydev = dev->phydev;
2171 
2172         if (dev->sfp_bus)
2173                 return sfp_get_module_info(dev->sfp_bus, modinfo);
2174 
2175         if (phydev && phydev->drv && phydev->drv->module_info)
2176                 return phydev->drv->module_info(phydev, modinfo);
2177 
2178         if (ops->get_module_info)
2179                 return ops->get_module_info(dev, modinfo);
2180 
2181         return -EOPNOTSUPP;
2182 }
2183 
2184 static int ethtool_get_module_info(struct net_device *dev,
2185                                    void __user *useraddr)
2186 {
2187         int ret;
2188         struct ethtool_modinfo modinfo;
2189 
2190         if (copy_from_user(&modinfo, useraddr, sizeof(modinfo)))
2191                 return -EFAULT;
2192 
2193         ret = __ethtool_get_module_info(dev, &modinfo);
2194         if (ret)
2195                 return ret;
2196 
2197         if (copy_to_user(useraddr, &modinfo, sizeof(modinfo)))
2198                 return -EFAULT;
2199 
2200         return 0;
2201 }
2202 
2203 static int __ethtool_get_module_eeprom(struct net_device *dev,
2204                                        struct ethtool_eeprom *ee, u8 *data)
2205 {
2206         const struct ethtool_ops *ops = dev->ethtool_ops;
2207         struct phy_device *phydev = dev->phydev;
2208 
2209         if (dev->sfp_bus)
2210                 return sfp_get_module_eeprom(dev->sfp_bus, ee, data);
2211 
2212         if (phydev && phydev->drv && phydev->drv->module_eeprom)
2213                 return phydev->drv->module_eeprom(phydev, ee, data);
2214 
2215         if (ops->get_module_eeprom)
2216                 return ops->get_module_eeprom(dev, ee, data);
2217 
2218         return -EOPNOTSUPP;
2219 }
2220 
2221 static int ethtool_get_module_eeprom(struct net_device *dev,
2222                                      void __user *useraddr)
2223 {
2224         int ret;
2225         struct ethtool_modinfo modinfo;
2226 
2227         ret = __ethtool_get_module_info(dev, &modinfo);
2228         if (ret)
2229                 return ret;
2230 
2231         return ethtool_get_any_eeprom(dev, useraddr,
2232                                       __ethtool_get_module_eeprom,
2233                                       modinfo.eeprom_len);
2234 }
2235 
2236 static int ethtool_tunable_valid(const struct ethtool_tunable *tuna)
2237 {
2238         switch (tuna->id) {
2239         case ETHTOOL_RX_COPYBREAK:
2240         case ETHTOOL_TX_COPYBREAK:
2241                 if (tuna->len != sizeof(u32) ||
2242                     tuna->type_id != ETHTOOL_TUNABLE_U32)
2243                         return -EINVAL;
2244                 break;
2245         case ETHTOOL_PFC_PREVENTION_TOUT:
2246                 if (tuna->len != sizeof(u16) ||
2247                     tuna->type_id != ETHTOOL_TUNABLE_U16)
2248                         return -EINVAL;
2249                 break;
2250         default:
2251                 return -EINVAL;
2252         }
2253 
2254         return 0;
2255 }
2256 
2257 static int ethtool_get_tunable(struct net_device *dev, void __user *useraddr)
2258 {
2259         int ret;
2260         struct ethtool_tunable tuna;
2261         const struct ethtool_ops *ops = dev->ethtool_ops;
2262         void *data;
2263 
2264         if (!ops->get_tunable)
2265                 return -EOPNOTSUPP;
2266         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2267                 return -EFAULT;
2268         ret = ethtool_tunable_valid(&tuna);
2269         if (ret)
2270                 return ret;
2271         data = kmalloc(tuna.len, GFP_USER);
2272         if (!data)
2273                 return -ENOMEM;
2274         ret = ops->get_tunable(dev, &tuna, data);
2275         if (ret)
2276                 goto out;
2277         useraddr += sizeof(tuna);
2278         ret = -EFAULT;
2279         if (copy_to_user(useraddr, data, tuna.len))
2280                 goto out;
2281         ret = 0;
2282 
2283 out:
2284         kfree(data);
2285         return ret;
2286 }
2287 
2288 static int ethtool_set_tunable(struct net_device *dev, void __user *useraddr)
2289 {
2290         int ret;
2291         struct ethtool_tunable tuna;
2292         const struct ethtool_ops *ops = dev->ethtool_ops;
2293         void *data;
2294 
2295         if (!ops->set_tunable)
2296                 return -EOPNOTSUPP;
2297         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2298                 return -EFAULT;
2299         ret = ethtool_tunable_valid(&tuna);
2300         if (ret)
2301                 return ret;
2302         useraddr += sizeof(tuna);
2303         data = memdup_user(useraddr, tuna.len);
2304         if (IS_ERR(data))
2305                 return PTR_ERR(data);
2306         ret = ops->set_tunable(dev, &tuna, data);
2307 
2308         kfree(data);
2309         return ret;
2310 }
2311 
2312 static int ethtool_get_per_queue_coalesce(struct net_device *dev,
2313                                           void __user *useraddr,
2314                                           struct ethtool_per_queue_op *per_queue_opt)
2315 {
2316         u32 bit;
2317         int ret;
2318         DECLARE_BITMAP(queue_mask, MAX_NUM_QUEUE);
2319 
2320         if (!dev->ethtool_ops->get_per_queue_coalesce)
2321                 return -EOPNOTSUPP;
2322 
2323         useraddr += sizeof(*per_queue_opt);
2324 
2325         bitmap_from_arr32(queue_mask, per_queue_opt->queue_mask,
2326                           MAX_NUM_QUEUE);
2327 
2328         for_each_set_bit(bit, queue_mask, MAX_NUM_QUEUE) {
2329                 struct ethtool_coalesce coalesce = { .cmd = ETHTOOL_GCOALESCE };
2330 
2331                 ret = dev->ethtool_ops->get_per_queue_coalesce(dev, bit, &coalesce);
2332                 if (ret != 0)
2333                         return ret;
2334                 if (copy_to_user(useraddr, &coalesce, sizeof(coalesce)))
2335                         return -EFAULT;
2336                 useraddr += sizeof(coalesce);
2337         }
2338 
2339         return 0;
2340 }
2341 
2342 static int ethtool_set_per_queue_coalesce(struct net_device *dev,
2343                                           void __user *useraddr,
2344                                           struct ethtool_per_queue_op *per_queue_opt)
2345 {
2346         u32 bit;
2347         int i, ret = 0;
2348         int n_queue;
2349         struct ethtool_coalesce *backup = NULL, *tmp = NULL;
2350         DECLARE_BITMAP(queue_mask, MAX_NUM_QUEUE);
2351 
2352         if ((!dev->ethtool_ops->set_per_queue_coalesce) ||
2353             (!dev->ethtool_ops->get_per_queue_coalesce))
2354                 return -EOPNOTSUPP;
2355 
2356         useraddr += sizeof(*per_queue_opt);
2357 
2358         bitmap_from_arr32(queue_mask, per_queue_opt->queue_mask, MAX_NUM_QUEUE);
2359         n_queue = bitmap_weight(queue_mask, MAX_NUM_QUEUE);
2360         tmp = backup = kmalloc_array(n_queue, sizeof(*backup), GFP_KERNEL);
2361         if (!backup)
2362                 return -ENOMEM;
2363 
2364         for_each_set_bit(bit, queue_mask, MAX_NUM_QUEUE) {
2365                 struct ethtool_coalesce coalesce;
2366 
2367                 ret = dev->ethtool_ops->get_per_queue_coalesce(dev, bit, tmp);
2368                 if (ret != 0)
2369                         goto roll_back;
2370 
2371                 tmp++;
2372 
2373                 if (copy_from_user(&coalesce, useraddr, sizeof(coalesce))) {
2374                         ret = -EFAULT;
2375                         goto roll_back;
2376                 }
2377 
2378                 ret = dev->ethtool_ops->set_per_queue_coalesce(dev, bit, &coalesce);
2379                 if (ret != 0)
2380                         goto roll_back;
2381 
2382                 useraddr += sizeof(coalesce);
2383         }
2384 
2385 roll_back:
2386         if (ret != 0) {
2387                 tmp = backup;
2388                 for_each_set_bit(i, queue_mask, bit) {
2389                         dev->ethtool_ops->set_per_queue_coalesce(dev, i, tmp);
2390                         tmp++;
2391                 }
2392         }
2393         kfree(backup);
2394 
2395         return ret;
2396 }
2397 
2398 static int ethtool_set_per_queue(struct net_device *dev,
2399                                  void __user *useraddr, u32 sub_cmd)
2400 {
2401         struct ethtool_per_queue_op per_queue_opt;
2402 
2403         if (copy_from_user(&per_queue_opt, useraddr, sizeof(per_queue_opt)))
2404                 return -EFAULT;
2405 
2406         if (per_queue_opt.sub_command != sub_cmd)
2407                 return -EINVAL;
2408 
2409         switch (per_queue_opt.sub_command) {
2410         case ETHTOOL_GCOALESCE:
2411                 return ethtool_get_per_queue_coalesce(dev, useraddr, &per_queue_opt);
2412         case ETHTOOL_SCOALESCE:
2413                 return ethtool_set_per_queue_coalesce(dev, useraddr, &per_queue_opt);
2414         default:
2415                 return -EOPNOTSUPP;
2416         };
2417 }
2418 
2419 static int ethtool_phy_tunable_valid(const struct ethtool_tunable *tuna)
2420 {
2421         switch (tuna->id) {
2422         case ETHTOOL_PHY_DOWNSHIFT:
2423                 if (tuna->len != sizeof(u8) ||
2424                     tuna->type_id != ETHTOOL_TUNABLE_U8)
2425                         return -EINVAL;
2426                 break;
2427         default:
2428                 return -EINVAL;
2429         }
2430 
2431         return 0;
2432 }
2433 
2434 static int get_phy_tunable(struct net_device *dev, void __user *useraddr)
2435 {
2436         int ret;
2437         struct ethtool_tunable tuna;
2438         struct phy_device *phydev = dev->phydev;
2439         void *data;
2440 
2441         if (!(phydev && phydev->drv && phydev->drv->get_tunable))
2442                 return -EOPNOTSUPP;
2443 
2444         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2445                 return -EFAULT;
2446         ret = ethtool_phy_tunable_valid(&tuna);
2447         if (ret)
2448                 return ret;
2449         data = kmalloc(tuna.len, GFP_USER);
2450         if (!data)
2451                 return -ENOMEM;
2452         mutex_lock(&phydev->lock);
2453         ret = phydev->drv->get_tunable(phydev, &tuna, data);
2454         mutex_unlock(&phydev->lock);
2455         if (ret)
2456                 goto out;
2457         useraddr += sizeof(tuna);
2458         ret = -EFAULT;
2459         if (copy_to_user(useraddr, data, tuna.len))
2460                 goto out;
2461         ret = 0;
2462 
2463 out:
2464         kfree(data);
2465         return ret;
2466 }
2467 
2468 static int set_phy_tunable(struct net_device *dev, void __user *useraddr)
2469 {
2470         int ret;
2471         struct ethtool_tunable tuna;
2472         struct phy_device *phydev = dev->phydev;
2473         void *data;
2474 
2475         if (!(phydev && phydev->drv && phydev->drv->set_tunable))
2476                 return -EOPNOTSUPP;
2477         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2478                 return -EFAULT;
2479         ret = ethtool_phy_tunable_valid(&tuna);
2480         if (ret)
2481                 return ret;
2482         useraddr += sizeof(tuna);
2483         data = memdup_user(useraddr, tuna.len);
2484         if (IS_ERR(data))
2485                 return PTR_ERR(data);
2486         mutex_lock(&phydev->lock);
2487         ret = phydev->drv->set_tunable(phydev, &tuna, data);
2488         mutex_unlock(&phydev->lock);
2489 
2490         kfree(data);
2491         return ret;
2492 }
2493 
2494 static int ethtool_get_fecparam(struct net_device *dev, void __user *useraddr)
2495 {
2496         struct ethtool_fecparam fecparam = { ETHTOOL_GFECPARAM };
2497         int rc;
2498 
2499         if (!dev->ethtool_ops->get_fecparam)
2500                 return -EOPNOTSUPP;
2501 
2502         rc = dev->ethtool_ops->get_fecparam(dev, &fecparam);
2503         if (rc)
2504                 return rc;
2505 
2506         if (copy_to_user(useraddr, &fecparam, sizeof(fecparam)))
2507                 return -EFAULT;
2508         return 0;
2509 }
2510 
2511 static int ethtool_set_fecparam(struct net_device *dev, void __user *useraddr)
2512 {
2513         struct ethtool_fecparam fecparam;
2514 
2515         if (!dev->ethtool_ops->set_fecparam)
2516                 return -EOPNOTSUPP;
2517 
2518         if (copy_from_user(&fecparam, useraddr, sizeof(fecparam)))
2519                 return -EFAULT;
2520 
2521         return dev->ethtool_ops->set_fecparam(dev, &fecparam);
2522 }
2523 
2524 /* The main entry point in this file.  Called from net/core/dev_ioctl.c */
2525 
2526 int dev_ethtool(struct net *net, struct ifreq *ifr)
2527 {
2528         struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
2529         void __user *useraddr = ifr->ifr_data;
2530         u32 ethcmd, sub_cmd;
2531         int rc;
2532         netdev_features_t old_features;
2533 
2534         if (!dev || !netif_device_present(dev))
2535                 return -ENODEV;
2536 
2537         if (copy_from_user(&ethcmd, useraddr, sizeof(ethcmd)))
2538                 return -EFAULT;
2539 
2540         if (ethcmd == ETHTOOL_PERQUEUE) {
2541                 if (copy_from_user(&sub_cmd, useraddr + sizeof(ethcmd), sizeof(sub_cmd)))
2542                         return -EFAULT;
2543         } else {
2544                 sub_cmd = ethcmd;
2545         }
2546         /* Allow some commands to be done by anyone */
2547         switch (sub_cmd) {
2548         case ETHTOOL_GSET:
2549         case ETHTOOL_GDRVINFO:
2550         case ETHTOOL_GMSGLVL:
2551         case ETHTOOL_GLINK:
2552         case ETHTOOL_GCOALESCE:
2553         case ETHTOOL_GRINGPARAM:
2554         case ETHTOOL_GPAUSEPARAM:
2555         case ETHTOOL_GRXCSUM:
2556         case ETHTOOL_GTXCSUM:
2557         case ETHTOOL_GSG:
2558         case ETHTOOL_GSSET_INFO:
2559         case ETHTOOL_GSTRINGS:
2560         case ETHTOOL_GSTATS:
2561         case ETHTOOL_GPHYSTATS:
2562         case ETHTOOL_GTSO:
2563         case ETHTOOL_GPERMADDR:
2564         case ETHTOOL_GUFO:
2565         case ETHTOOL_GGSO:
2566         case ETHTOOL_GGRO:
2567         case ETHTOOL_GFLAGS:
2568         case ETHTOOL_GPFLAGS:
2569         case ETHTOOL_GRXFH:
2570         case ETHTOOL_GRXRINGS:
2571         case ETHTOOL_GRXCLSRLCNT:
2572         case ETHTOOL_GRXCLSRULE:
2573         case ETHTOOL_GRXCLSRLALL:
2574         case ETHTOOL_GRXFHINDIR:
2575         case ETHTOOL_GRSSH:
2576         case ETHTOOL_GFEATURES:
2577         case ETHTOOL_GCHANNELS:
2578         case ETHTOOL_GET_TS_INFO:
2579         case ETHTOOL_GEEE:
2580         case ETHTOOL_GTUNABLE:
2581         case ETHTOOL_PHY_GTUNABLE:
2582         case ETHTOOL_GLINKSETTINGS:
2583         case ETHTOOL_GFECPARAM:
2584                 break;
2585         default:
2586                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2587                         return -EPERM;
2588         }
2589 
2590         if (dev->ethtool_ops->begin) {
2591                 rc = dev->ethtool_ops->begin(dev);
2592                 if (rc  < 0)
2593                         return rc;
2594         }
2595         old_features = dev->features;
2596 
2597         switch (ethcmd) {
2598         case ETHTOOL_GSET:
2599                 rc = ethtool_get_settings(dev, useraddr);
2600                 break;
2601         case ETHTOOL_SSET:
2602                 rc = ethtool_set_settings(dev, useraddr);
2603                 break;
2604         case ETHTOOL_GDRVINFO:
2605                 rc = ethtool_get_drvinfo(dev, useraddr);
2606                 break;
2607         case ETHTOOL_GREGS:
2608                 rc = ethtool_get_regs(dev, useraddr);
2609                 break;
2610         case ETHTOOL_GWOL:
2611                 rc = ethtool_get_wol(dev, useraddr);
2612                 break;
2613         case ETHTOOL_SWOL:
2614                 rc = ethtool_set_wol(dev, useraddr);
2615                 break;
2616         case ETHTOOL_GMSGLVL:
2617                 rc = ethtool_get_value(dev, useraddr, ethcmd,
2618                                        dev->ethtool_ops->get_msglevel);
2619                 break;
2620         case ETHTOOL_SMSGLVL:
2621                 rc = ethtool_set_value_void(dev, useraddr,
2622                                        dev->ethtool_ops->set_msglevel);
2623                 break;
2624         case ETHTOOL_GEEE:
2625                 rc = ethtool_get_eee(dev, useraddr);
2626                 break;
2627         case ETHTOOL_SEEE:
2628                 rc = ethtool_set_eee(dev, useraddr);
2629                 break;
2630         case ETHTOOL_NWAY_RST:
2631                 rc = ethtool_nway_reset(dev);
2632                 break;
2633         case ETHTOOL_GLINK:
2634                 rc = ethtool_get_link(dev, useraddr);
2635                 break;
2636         case ETHTOOL_GEEPROM:
2637                 rc = ethtool_get_eeprom(dev, useraddr);
2638                 break;
2639         case ETHTOOL_SEEPROM:
2640                 rc = ethtool_set_eeprom(dev, useraddr);
2641                 break;
2642         case ETHTOOL_GCOALESCE:
2643                 rc = ethtool_get_coalesce(dev, useraddr);
2644                 break;
2645         case ETHTOOL_SCOALESCE:
2646                 rc = ethtool_set_coalesce(dev, useraddr);
2647                 break;
2648         case ETHTOOL_GRINGPARAM:
2649                 rc = ethtool_get_ringparam(dev, useraddr);
2650                 break;
2651         case ETHTOOL_SRINGPARAM:
2652                 rc = ethtool_set_ringparam(dev, useraddr);
2653                 break;
2654         case ETHTOOL_GPAUSEPARAM:
2655                 rc = ethtool_get_pauseparam(dev, useraddr);
2656                 break;
2657         case ETHTOOL_SPAUSEPARAM:
2658                 rc = ethtool_set_pauseparam(dev, useraddr);
2659                 break;
2660         case ETHTOOL_TEST:
2661                 rc = ethtool_self_test(dev, useraddr);
2662                 break;
2663         case ETHTOOL_GSTRINGS:
2664                 rc = ethtool_get_strings(dev, useraddr);
2665                 break;
2666         case ETHTOOL_PHYS_ID:
2667                 rc = ethtool_phys_id(dev, useraddr);
2668                 break;
2669         case ETHTOOL_GSTATS:
2670                 rc = ethtool_get_stats(dev, useraddr);
2671                 break;
2672         case ETHTOOL_GPERMADDR:
2673                 rc = ethtool_get_perm_addr(dev, useraddr);
2674                 break;
2675         case ETHTOOL_GFLAGS:
2676                 rc = ethtool_get_value(dev, useraddr, ethcmd,
2677                                         __ethtool_get_flags);
2678                 break;
2679         case ETHTOOL_SFLAGS:
2680                 rc = ethtool_set_value(dev, useraddr, __ethtool_set_flags);
2681                 break;
2682         case ETHTOOL_GPFLAGS:
2683                 rc = ethtool_get_value(dev, useraddr, ethcmd,
2684                                        dev->ethtool_ops->get_priv_flags);
2685                 break;
2686         case ETHTOOL_SPFLAGS:
2687                 rc = ethtool_set_value(dev, useraddr,
2688                                        dev->ethtool_ops->set_priv_flags);
2689                 break;
2690         case ETHTOOL_GRXFH:
2691         case ETHTOOL_GRXRINGS:
2692         case ETHTOOL_GRXCLSRLCNT:
2693         case ETHTOOL_GRXCLSRULE:
2694         case ETHTOOL_GRXCLSRLALL:
2695                 rc = ethtool_get_rxnfc(dev, ethcmd, useraddr);
2696                 break;
2697         case ETHTOOL_SRXFH:
2698         case ETHTOOL_SRXCLSRLDEL:
2699         case ETHTOOL_SRXCLSRLINS:
2700                 rc = ethtool_set_rxnfc(dev, ethcmd, useraddr);
2701                 break;
2702         case ETHTOOL_FLASHDEV:
2703                 rc = ethtool_flash_device(dev, useraddr);
2704                 break;
2705         case ETHTOOL_RESET:
2706                 rc = ethtool_reset(dev, useraddr);
2707                 break;
2708         case ETHTOOL_GSSET_INFO:
2709                 rc = ethtool_get_sset_info(dev, useraddr);
2710                 break;
2711         case ETHTOOL_GRXFHINDIR:
2712                 rc = ethtool_get_rxfh_indir(dev, useraddr);
2713                 break;
2714         case ETHTOOL_SRXFHINDIR:
2715                 rc = ethtool_set_rxfh_indir(dev, useraddr);
2716                 break;
2717         case ETHTOOL_GRSSH:
2718                 rc = ethtool_get_rxfh(dev, useraddr);
2719                 break;
2720         case ETHTOOL_SRSSH:
2721                 rc = ethtool_set_rxfh(dev, useraddr);
2722                 break;
2723         case ETHTOOL_GFEATURES:
2724                 rc = ethtool_get_features(dev, useraddr);
2725                 break;
2726         case ETHTOOL_SFEATURES:
2727                 rc = ethtool_set_features(dev, useraddr);
2728                 break;
2729         case ETHTOOL_GTXCSUM:
2730         case ETHTOOL_GRXCSUM:
2731         case ETHTOOL_GSG:
2732         case ETHTOOL_GTSO:
2733         case ETHTOOL_GGSO:
2734         case ETHTOOL_GGRO:
2735                 rc = ethtool_get_one_feature(dev, useraddr, ethcmd);
2736                 break;
2737         case ETHTOOL_STXCSUM:
2738         case ETHTOOL_SRXCSUM:
2739         case ETHTOOL_SSG:
2740         case ETHTOOL_STSO:
2741         case ETHTOOL_SGSO:
2742         case ETHTOOL_SGRO:
2743                 rc = ethtool_set_one_feature(dev, useraddr, ethcmd);
2744                 break;
2745         case ETHTOOL_GCHANNELS:
2746                 rc = ethtool_get_channels(dev, useraddr);
2747                 break;
2748         case ETHTOOL_SCHANNELS:
2749                 rc = ethtool_set_channels(dev, useraddr);
2750                 break;
2751         case ETHTOOL_SET_DUMP:
2752                 rc = ethtool_set_dump(dev, useraddr);
2753                 break;
2754         case ETHTOOL_GET_DUMP_FLAG:
2755                 rc = ethtool_get_dump_flag(dev, useraddr);
2756                 break;
2757         case ETHTOOL_GET_DUMP_DATA:
2758                 rc = ethtool_get_dump_data(dev, useraddr);
2759                 break;
2760         case ETHTOOL_GET_TS_INFO:
2761                 rc = ethtool_get_ts_info(dev, useraddr);
2762                 break;
2763         case ETHTOOL_GMODULEINFO:
2764                 rc = ethtool_get_module_info(dev, useraddr);
2765                 break;
2766         case ETHTOOL_GMODULEEEPROM:
2767                 rc = ethtool_get_module_eeprom(dev, useraddr);
2768                 break;
2769         case ETHTOOL_GTUNABLE:
2770                 rc = ethtool_get_tunable(dev, useraddr);
2771                 break;
2772         case ETHTOOL_STUNABLE:
2773                 rc = ethtool_set_tunable(dev, useraddr);
2774                 break;
2775         case ETHTOOL_GPHYSTATS:
2776                 rc = ethtool_get_phy_stats(dev, useraddr);
2777                 break;
2778         case ETHTOOL_PERQUEUE:
2779                 rc = ethtool_set_per_queue(dev, useraddr, sub_cmd);
2780                 break;
2781         case ETHTOOL_GLINKSETTINGS:
2782                 rc = ethtool_get_link_ksettings(dev, useraddr);
2783                 break;
2784         case ETHTOOL_SLINKSETTINGS:
2785                 rc = ethtool_set_link_ksettings(dev, useraddr);
2786                 break;
2787         case ETHTOOL_PHY_GTUNABLE:
2788                 rc = get_phy_tunable(dev, useraddr);
2789                 break;
2790         case ETHTOOL_PHY_STUNABLE:
2791                 rc = set_phy_tunable(dev, useraddr);
2792                 break;
2793         case ETHTOOL_GFECPARAM:
2794                 rc = ethtool_get_fecparam(dev, useraddr);
2795                 break;
2796         case ETHTOOL_SFECPARAM:
2797                 rc = ethtool_set_fecparam(dev, useraddr);
2798                 break;
2799         default:
2800                 rc = -EOPNOTSUPP;
2801         }
2802 
2803         if (dev->ethtool_ops->complete)
2804                 dev->ethtool_ops->complete(dev);
2805 
2806         if (old_features != dev->features)
2807                 netdev_features_change(dev);
2808 
2809         return rc;
2810 }
2811 

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