net/core/ethtool.c

   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
  31 /*
  32  * Some useful ethtool_ops methods that're device independent.
  33  * If we find that all drivers want to do the same thing here,
  34  * we can turn these into dev_() function calls.
  35  */
  36
  37 u32 ethtool_op_get_link(struct net_device *dev)
  38 {
  39         return netif_carrier_ok(dev) ? 1 : 0;
  40 }
  41 EXPORT_SYMBOL(ethtool_op_get_link);
  42
  43 int ethtool_op_get_ts_info(struct net_device *dev, struct ethtool_ts_info *info)
  44 {
  45         info->so_timestamping =
  46                 SOF_TIMESTAMPING_TX_SOFTWARE |
  47                 SOF_TIMESTAMPING_RX_SOFTWARE |
  48                 SOF_TIMESTAMPING_SOFTWARE;
  49         info->phc_index = -1;
  50         return 0;
  51 }
  52 EXPORT_SYMBOL(ethtool_op_get_ts_info);
  53
  54 /* Handlers for each ethtool command */
  55
  56 #define ETHTOOL_DEV_FEATURE_WORDS       ((NETDEV_FEATURE_COUNT + 31) / 32)
  57
  58 static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN] = {
  59         [NETIF_F_SG_BIT] =               "tx-scatter-gather",
  60         [NETIF_F_IP_CSUM_BIT] =          "tx-checksum-ipv4",
  61         [NETIF_F_HW_CSUM_BIT] =          "tx-checksum-ip-generic",
  62         [NETIF_F_IPV6_CSUM_BIT] =        "tx-checksum-ipv6",
  63         [NETIF_F_HIGHDMA_BIT] =          "highdma",
  64         [NETIF_F_FRAGLIST_BIT] =         "tx-scatter-gather-fraglist",
  65         [NETIF_F_HW_VLAN_CTAG_TX_BIT] =  "tx-vlan-hw-insert",
  66
  67         [NETIF_F_HW_VLAN_CTAG_RX_BIT] =  "rx-vlan-hw-parse",
  68         [NETIF_F_HW_VLAN_CTAG_FILTER_BIT] = "rx-vlan-filter",
  69         [NETIF_F_HW_VLAN_STAG_TX_BIT] =  "tx-vlan-stag-hw-insert",
  70         [NETIF_F_HW_VLAN_STAG_RX_BIT] =  "rx-vlan-stag-hw-parse",
  71         [NETIF_F_HW_VLAN_STAG_FILTER_BIT] = "rx-vlan-stag-filter",
  72         [NETIF_F_VLAN_CHALLENGED_BIT] =  "vlan-challenged",
  73         [NETIF_F_GSO_BIT] =              "tx-generic-segmentation",
  74         [NETIF_F_LLTX_BIT] =             "tx-lockless",
  75         [NETIF_F_NETNS_LOCAL_BIT] =      "netns-local",
  76         [NETIF_F_GRO_BIT] =              "rx-gro",
  77         [NETIF_F_GRO_HW_BIT] =           "rx-gro-hw",
  78         [NETIF_F_LRO_BIT] =              "rx-lro",
  79
  80         [NETIF_F_TSO_BIT] =              "tx-tcp-segmentation",
  81         [NETIF_F_GSO_ROBUST_BIT] =       "tx-gso-robust",
  82         [NETIF_F_TSO_ECN_BIT] =          "tx-tcp-ecn-segmentation",
  83         [NETIF_F_TSO_MANGLEID_BIT] =     "tx-tcp-mangleid-segmentation",
  84         [NETIF_F_TSO6_BIT] =             "tx-tcp6-segmentation",
  85         [NETIF_F_FSO_BIT] =              "tx-fcoe-segmentation",
  86         [NETIF_F_GSO_GRE_BIT] =          "tx-gre-segmentation",
  87         [NETIF_F_GSO_GRE_CSUM_BIT] =     "tx-gre-csum-segmentation",
  88         [NETIF_F_GSO_IPXIP4_BIT] =       "tx-ipxip4-segmentation",
  89         [NETIF_F_GSO_IPXIP6_BIT] =       "tx-ipxip6-segmentation",
  90         [NETIF_F_GSO_UDP_TUNNEL_BIT] =   "tx-udp_tnl-segmentation",
  91         [NETIF_F_GSO_UDP_TUNNEL_CSUM_BIT] = "tx-udp_tnl-csum-segmentation",
  92         [NETIF_F_GSO_PARTIAL_BIT] =      "tx-gso-partial",
  93         [NETIF_F_GSO_SCTP_BIT] =         "tx-sctp-segmentation",
  94         [NETIF_F_GSO_ESP_BIT] =          "tx-esp-segmentation",
  95         [NETIF_F_GSO_UDP_L4_BIT] =       "tx-udp-segmentation",
  96
  97         [NETIF_F_FCOE_CRC_BIT] =         "tx-checksum-fcoe-crc",
  98         [NETIF_F_SCTP_CRC_BIT] =        "tx-checksum-sctp",
  99         [NETIF_F_FCOE_MTU_BIT] =         "fcoe-mtu",
 100         [NETIF_F_NTUPLE_BIT] =           "rx-ntuple-filter",
 101         [NETIF_F_RXHASH_BIT] =           "rx-hashing",
 102         [NETIF_F_RXCSUM_BIT] =           "rx-checksum",
 103         [NETIF_F_NOCACHE_COPY_BIT] =     "tx-nocache-copy",
 104         [NETIF_F_LOOPBACK_BIT] =         "loopback",
 105         [NETIF_F_RXFCS_BIT] =            "rx-fcs",
 106         [NETIF_F_RXALL_BIT] =            "rx-all",
 107         [NETIF_F_HW_L2FW_DOFFLOAD_BIT] = "l2-fwd-offload",
 108         [NETIF_F_HW_TC_BIT] =            "hw-tc-offload",
 109         [NETIF_F_HW_ESP_BIT] =           "esp-hw-offload",
 110         [NETIF_F_HW_ESP_TX_CSUM_BIT] =   "esp-tx-csum-hw-offload",
 111         [NETIF_F_RX_UDP_TUNNEL_PORT_BIT] =       "rx-udp_tunnel-port-offload",
 112         [NETIF_F_HW_TLS_RECORD_BIT] =   "tls-hw-record",
 113         [NETIF_F_HW_TLS_TX_BIT] =        "tls-hw-tx-offload",
 114 };
 115
 116 static const char
 117 rss_hash_func_strings[ETH_RSS_HASH_FUNCS_COUNT][ETH_GSTRING_LEN] = {
 118         [ETH_RSS_HASH_TOP_BIT] =        "toeplitz",
 119         [ETH_RSS_HASH_XOR_BIT] =        "xor",
 120         [ETH_RSS_HASH_CRC32_BIT] =      "crc32",
 121 };
 122
 123 static const char
 124 tunable_strings[__ETHTOOL_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
 125         [ETHTOOL_ID_UNSPEC]     = "Unspec",
 126         [ETHTOOL_RX_COPYBREAK]  = "rx-copybreak",
 127         [ETHTOOL_TX_COPYBREAK]  = "tx-copybreak",
 128         [ETHTOOL_PFC_PREVENTION_TOUT] = "pfc-prevention-tout",
 129 };
 130
 131 static const char
 132 phy_tunable_strings[__ETHTOOL_PHY_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
 133         [ETHTOOL_ID_UNSPEC]     = "Unspec",
 134         [ETHTOOL_PHY_DOWNSHIFT] = "phy-downshift",
 135 };
 136
 137 static int ethtool_get_features(struct net_device *dev, void __user *useraddr)
 138 {
 139         struct ethtool_gfeatures cmd = {
 140                 .cmd = ETHTOOL_GFEATURES,
 141                 .size = ETHTOOL_DEV_FEATURE_WORDS,
 142         };
 143         struct ethtool_get_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
 144         u32 __user *sizeaddr;
 145         u32 copy_size;
 146         int i;
 147
 148         /* in case feature bits run out again */
 149         BUILD_BUG_ON(ETHTOOL_DEV_FEATURE_WORDS * sizeof(u32) > sizeof(netdev_features_t));
 150
 151         for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
 152                 features[i].available = (u32)(dev->hw_features >> (32 * i));
 153                 features[i].requested = (u32)(dev->wanted_features >> (32 * i));
 154                 features[i].active = (u32)(dev->features >> (32 * i));
 155                 features[i].never_changed =
 156                         (u32)(NETIF_F_NEVER_CHANGE >> (32 * i));
 157         }
 158
 159         sizeaddr = useraddr + offsetof(struct ethtool_gfeatures, size);
 160         if (get_user(copy_size, sizeaddr))
 161                 return -EFAULT;
 162
 163         if (copy_size > ETHTOOL_DEV_FEATURE_WORDS)
 164                 copy_size = ETHTOOL_DEV_FEATURE_WORDS;
 165
 166         if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
 167                 return -EFAULT;
 168         useraddr += sizeof(cmd);
 169         if (copy_to_user(useraddr, features, copy_size * sizeof(*features)))
 170                 return -EFAULT;
 171
 172         return 0;
 173 }
 174
 175 static int ethtool_set_features(struct net_device *dev, void __user *useraddr)
 176 {
 177         struct ethtool_sfeatures cmd;
 178         struct ethtool_set_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
 179         netdev_features_t wanted = 0, valid = 0;
 180         int i, ret = 0;
 181
 182         if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
 183                 return -EFAULT;
 184         useraddr += sizeof(cmd);
 185
 186         if (cmd.size != ETHTOOL_DEV_FEATURE_WORDS)
 187                 return -EINVAL;
 188
 189         if (copy_from_user(features, useraddr, sizeof(features)))
 190                 return -EFAULT;
 191
 192         for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
 193                 valid |= (netdev_features_t)features[i].valid << (32 * i);
 194                 wanted |= (netdev_features_t)features[i].requested << (32 * i);
 195         }
 196
 197         if (valid & ~NETIF_F_ETHTOOL_BITS)
 198                 return -EINVAL;
 199
 200         if (valid & ~dev->hw_features) {
 201                 valid &= dev->hw_features;
 202                 ret |= ETHTOOL_F_UNSUPPORTED;
 203         }
 204
 205         dev->wanted_features &= ~valid;
 206         dev->wanted_features |= wanted & valid;
 207         __netdev_update_features(dev);
 208
 209         if ((dev->wanted_features ^ dev->features) & valid)
 210                 ret |= ETHTOOL_F_WISH;
 211
 212         return ret;
 213 }
 214
 215 static int __ethtool_get_sset_count(struct net_device *dev, int sset)
 216 {
 217         const struct ethtool_ops *ops = dev->ethtool_ops;
 218
 219         if (sset == ETH_SS_FEATURES)
 220                 return ARRAY_SIZE(netdev_features_strings);
 221
 222         if (sset == ETH_SS_RSS_HASH_FUNCS)
 223                 return ARRAY_SIZE(rss_hash_func_strings);
 224
 225         if (sset == ETH_SS_TUNABLES)
 226                 return ARRAY_SIZE(tunable_strings);
 227
 228         if (sset == ETH_SS_PHY_TUNABLES)
 229                 return ARRAY_SIZE(phy_tunable_strings);
 230
 231         if (sset == ETH_SS_PHY_STATS && dev->phydev &&
 232             !ops->get_ethtool_phy_stats)
 233                 return phy_ethtool_get_sset_count(dev->phydev);
 234
 235         if (ops->get_sset_count && ops->get_strings)
 236                 return ops->get_sset_count(dev, sset);
 237         else
 238                 return -EOPNOTSUPP;
 239 }
 240
 241 static void __ethtool_get_strings(struct net_device *dev,
 242         u32 stringset, u8 *data)
 243 {
 244         const struct ethtool_ops *ops = dev->ethtool_ops;
 245
 246         if (stringset == ETH_SS_FEATURES)
 247                 memcpy(data, netdev_features_strings,
 248                         sizeof(netdev_features_strings));
 249         else if (stringset == ETH_SS_RSS_HASH_FUNCS)
 250                 memcpy(data, rss_hash_func_strings,
 251                        sizeof(rss_hash_func_strings));
 252         else if (stringset == ETH_SS_TUNABLES)
 253                 memcpy(data, tunable_strings, sizeof(tunable_strings));
 254         else if (stringset == ETH_SS_PHY_TUNABLES)
 255                 memcpy(data, phy_tunable_strings, sizeof(phy_tunable_strings));
 256         else if (stringset == ETH_SS_PHY_STATS && dev->phydev &&
 257                  !ops->get_ethtool_phy_stats)
 258                 phy_ethtool_get_strings(dev->phydev, data);
 259         else
 260                 /* ops->get_strings is valid because checked earlier */
 261                 ops->get_strings(dev, stringset, data);
 262 }
 263
 264 static netdev_features_t ethtool_get_feature_mask(u32 eth_cmd)
 265 {
 266         /* feature masks of legacy discrete ethtool ops */
 267
 268         switch (eth_cmd) {
 269         case ETHTOOL_GTXCSUM:
 270         case ETHTOOL_STXCSUM:
 271                 return NETIF_F_CSUM_MASK | NETIF_F_SCTP_CRC;
 272         case ETHTOOL_GRXCSUM:
 273         case ETHTOOL_SRXCSUM:
 274                 return NETIF_F_RXCSUM;
 275         case ETHTOOL_GSG:
 276         case ETHTOOL_SSG:
 277                 return NETIF_F_SG;
 278         case ETHTOOL_GTSO:
 279         case ETHTOOL_STSO:
 280                 return NETIF_F_ALL_TSO;
 281         case ETHTOOL_GGSO:
 282         case ETHTOOL_SGSO:
 283                 return NETIF_F_GSO;
 284         case ETHTOOL_GGRO:
 285         case ETHTOOL_SGRO:
 286                 return NETIF_F_GRO;
 287         default:
 288                 BUG();
 289         }
 290 }
 291
 292 static int ethtool_get_one_feature(struct net_device *dev,
 293         char __user *useraddr, u32 ethcmd)
 294 {
 295         netdev_features_t mask = ethtool_get_feature_mask(ethcmd);
 296         struct ethtool_value edata = {
 297                 .cmd = ethcmd,
 298                 .data = !!(dev->features & mask),
 299         };
 300
 301         if (copy_to_user(useraddr, &edata, sizeof(edata)))
 302                 return -EFAULT;
 303         return 0;
 304 }
 305
 306 static int ethtool_set_one_feature(struct net_device *dev,
 307         void __user *useraddr, u32 ethcmd)
 308 {
 309         struct ethtool_value edata;
 310         netdev_features_t mask;
 311
 312         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 313                 return -EFAULT;
 314
 315         mask = ethtool_get_feature_mask(ethcmd);
 316         mask &= dev->hw_features;
 317         if (!mask)
 318                 return -EOPNOTSUPP;
 319
 320         if (edata.data)
 321                 dev->wanted_features |= mask;
 322         else
 323                 dev->wanted_features &= ~mask;
 324
 325         __netdev_update_features(dev);
 326
 327         return 0;
 328 }
 329
 330 #define ETH_ALL_FLAGS    (ETH_FLAG_LRO | ETH_FLAG_RXVLAN | ETH_FLAG_TXVLAN | \
 331                           ETH_FLAG_NTUPLE | ETH_FLAG_RXHASH)
 332 #define ETH_ALL_FEATURES (NETIF_F_LRO | NETIF_F_HW_VLAN_CTAG_RX | \
 333                           NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_NTUPLE | \
 334                           NETIF_F_RXHASH)
 335
 336 static u32 __ethtool_get_flags(struct net_device *dev)
 337 {
 338         u32 flags = 0;
 339
 340         if (dev->features & NETIF_F_LRO)
 341                 flags |= ETH_FLAG_LRO;
 342         if (dev->features & NETIF_F_HW_VLAN_CTAG_RX)
 343                 flags |= ETH_FLAG_RXVLAN;
 344         if (dev->features & NETIF_F_HW_VLAN_CTAG_TX)
 345                 flags |= ETH_FLAG_TXVLAN;
 346         if (dev->features & NETIF_F_NTUPLE)
 347                 flags |= ETH_FLAG_NTUPLE;
 348         if (dev->features & NETIF_F_RXHASH)
 349                 flags |= ETH_FLAG_RXHASH;
 350
 351         return flags;
 352 }
 353
 354 static int __ethtool_set_flags(struct net_device *dev, u32 data)
 355 {
 356         netdev_features_t features = 0, changed;
 357
 358         if (data & ~ETH_ALL_FLAGS)
 359                 return -EINVAL;
 360
 361         if (data & ETH_FLAG_LRO)
 362                 features |= NETIF_F_LRO;
 363         if (data & ETH_FLAG_RXVLAN)
 364                 features |= NETIF_F_HW_VLAN_CTAG_RX;
 365         if (data & ETH_FLAG_TXVLAN)
 366                 features |= NETIF_F_HW_VLAN_CTAG_TX;
 367         if (data & ETH_FLAG_NTUPLE)
 368                 features |= NETIF_F_NTUPLE;
 369         if (data & ETH_FLAG_RXHASH)
 370                 features |= NETIF_F_RXHASH;
 371
 372         /* allow changing only bits set in hw_features */
 373         changed = (features ^ dev->features) & ETH_ALL_FEATURES;
 374         if (changed & ~dev->hw_features)
 375                 return (changed & dev->hw_features) ? -EINVAL : -EOPNOTSUPP;
 376
 377         dev->wanted_features =
 378                 (dev->wanted_features & ~changed) | (features & changed);
 379
 380         __netdev_update_features(dev);
 381
 382         return 0;
 383 }
 384
 385 /* Given two link masks, AND them together and save the result in dst. */
 386 void ethtool_intersect_link_masks(struct ethtool_link_ksettings *dst,
 387                                   struct ethtool_link_ksettings *src)
 388 {
 389         unsigned int size = BITS_TO_LONGS(__ETHTOOL_LINK_MODE_MASK_NBITS);
 390         unsigned int idx = 0;
 391
 392         for (; idx < size; idx++) {
 393                 dst->link_modes.supported[idx] &=
 394                         src->link_modes.supported[idx];
 395                 dst->link_modes.advertising[idx] &=
 396                         src->link_modes.advertising[idx];
 397         }
 398 }
 399 EXPORT_SYMBOL(ethtool_intersect_link_masks);
 400
 401 void ethtool_convert_legacy_u32_to_link_mode(unsigned long *dst,
 402                                              u32 legacy_u32)
 403 {
 404         bitmap_zero(dst, __ETHTOOL_LINK_MODE_MASK_NBITS);
 405         dst[0] = legacy_u32;
 406 }
 407 EXPORT_SYMBOL(ethtool_convert_legacy_u32_to_link_mode);
 408
 409 /* return false if src had higher bits set. lower bits always updated. */
 410 bool ethtool_convert_link_mode_to_legacy_u32(u32 *legacy_u32,
 411                                              const unsigned long *src)
 412 {
 413         bool retval = true;
 414
 415         /* TODO: following test will soon always be true */
 416         if (__ETHTOOL_LINK_MODE_MASK_NBITS > 32) {
 417                 __ETHTOOL_DECLARE_LINK_MODE_MASK(ext);
 418
 419                 bitmap_zero(ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
 420                 bitmap_fill(ext, 32);
 421                 bitmap_complement(ext, ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
 422                 if (bitmap_intersects(ext, src,
 423                                       __ETHTOOL_LINK_MODE_MASK_NBITS)) {
 424                         /* src mask goes beyond bit 31 */
 425                         retval = false;
 426                 }
 427         }
 428         *legacy_u32 = src[0];
 429         return retval;
 430 }
 431 EXPORT_SYMBOL(ethtool_convert_link_mode_to_legacy_u32);
 432
 433 /* return false if legacy contained non-0 deprecated fields
 434  * maxtxpkt/maxrxpkt. rest of ksettings always updated
 435  */
 436 static bool
 437 convert_legacy_settings_to_link_ksettings(
 438         struct ethtool_link_ksettings *link_ksettings,
 439         const struct ethtool_cmd *legacy_settings)
 440 {
 441         bool retval = true;
 442
 443         memset(link_ksettings, 0, sizeof(*link_ksettings));
 444
 445         /* This is used to tell users that driver is still using these
 446          * deprecated legacy fields, and they should not use
 447          * %ETHTOOL_GLINKSETTINGS/%ETHTOOL_SLINKSETTINGS
 448          */
 449         if (legacy_settings->maxtxpkt ||
 450             legacy_settings->maxrxpkt)
 451                 retval = false;
 452
 453         ethtool_convert_legacy_u32_to_link_mode(
 454                 link_ksettings->link_modes.supported,
 455                 legacy_settings->supported);
 456         ethtool_convert_legacy_u32_to_link_mode(
 457                 link_ksettings->link_modes.advertising,
 458                 legacy_settings->advertising);
 459         ethtool_convert_legacy_u32_to_link_mode(
 460                 link_ksettings->link_modes.lp_advertising,
 461                 legacy_settings->lp_advertising);
 462         link_ksettings->base.speed
 463                 = ethtool_cmd_speed(legacy_settings);
 464         link_ksettings->base.duplex
 465                 = legacy_settings->duplex;
 466         link_ksettings->base.port
 467                 = legacy_settings->port;
 468         link_ksettings->base.phy_address
 469                 = legacy_settings->phy_address;
 470         link_ksettings->base.autoneg
 471                 = legacy_settings->autoneg;
 472         link_ksettings->base.mdio_support
 473                 = legacy_settings->mdio_support;
 474         link_ksettings->base.eth_tp_mdix
 475                 = legacy_settings->eth_tp_mdix;
 476         link_ksettings->base.eth_tp_mdix_ctrl
 477                 = legacy_settings->eth_tp_mdix_ctrl;
 478         return retval;
 479 }
 480
 481 /* return false if ksettings link modes had higher bits
 482  * set. legacy_settings always updated (best effort)
 483  */
 484 static bool
 485 convert_link_ksettings_to_legacy_settings(
 486         struct ethtool_cmd *legacy_settings,
 487         const struct ethtool_link_ksettings *link_ksettings)
 488 {
 489         bool retval = true;
 490
 491         memset(legacy_settings, 0, sizeof(*legacy_settings));
 492         /* this also clears the deprecated fields in legacy structure:
 493          * __u8         transceiver;
 494          * __u32        maxtxpkt;
 495          * __u32        maxrxpkt;
 496          */
 497
 498         retval &= ethtool_convert_link_mode_to_legacy_u32(
 499                 &legacy_settings->supported,
 500                 link_ksettings->link_modes.supported);
 501         retval &= ethtool_convert_link_mode_to_legacy_u32(
 502                 &legacy_settings->advertising,
 503                 link_ksettings->link_modes.advertising);
 504         retval &= ethtool_convert_link_mode_to_legacy_u32(
 505                 &legacy_settings->lp_advertising,
 506                 link_ksettings->link_modes.lp_advertising);
 507         ethtool_cmd_speed_set(legacy_settings, link_ksettings->base.speed);
 508         legacy_settings->duplex
 509                 = link_ksettings->base.duplex;
 510         legacy_settings->port
 511                 = link_ksettings->base.port;
 512         legacy_settings->phy_address
 513                 = link_ksettings->base.phy_address;
 514         legacy_settings->autoneg
 515                 = link_ksettings->base.autoneg;
 516         legacy_settings->mdio_support
 517                 = link_ksettings->base.mdio_support;
 518         legacy_settings->eth_tp_mdix
 519                 = link_ksettings->base.eth_tp_mdix;
 520         legacy_settings->eth_tp_mdix_ctrl
 521                 = link_ksettings->base.eth_tp_mdix_ctrl;
 522         legacy_settings->transceiver
 523                 = link_ksettings->base.transceiver;
 524         return retval;
 525 }
 526
 527 /* number of 32-bit words to store the user's link mode bitmaps */
 528 #define __ETHTOOL_LINK_MODE_MASK_NU32                   \
 529         DIV_ROUND_UP(__ETHTOOL_LINK_MODE_MASK_NBITS, 32)
 530
 531 /* layout of the struct passed from/to userland */
 532 struct ethtool_link_usettings {
 533         struct ethtool_link_settings base;
 534         struct {
 535                 __u32 supported[__ETHTOOL_LINK_MODE_MASK_NU32];
 536                 __u32 advertising[__ETHTOOL_LINK_MODE_MASK_NU32];
 537                 __u32 lp_advertising[__ETHTOOL_LINK_MODE_MASK_NU32];
 538         } link_modes;
 539 };
 540
 541 /* Internal kernel helper to query a device ethtool_link_settings.
 542  *
 543  * Backward compatibility note: for compatibility with legacy drivers
 544  * that implement only the ethtool_cmd API, this has to work with both
 545  * drivers implementing get_link_ksettings API and drivers
 546  * implementing get_settings API. When drivers implement get_settings
 547  * and report ethtool_cmd deprecated fields
 548  * (transceiver/maxrxpkt/maxtxpkt), these fields are silently ignored
 549  * because the resulting struct ethtool_link_settings does not report them.
 550  */
 551 int __ethtool_get_link_ksettings(struct net_device *dev,
 552                                  struct ethtool_link_ksettings *link_ksettings)
 553 {
 554         int err;
 555         struct ethtool_cmd cmd;
 556
 557         ASSERT_RTNL();
 558
 559         if (dev->ethtool_ops->get_link_ksettings) {
 560                 memset(link_ksettings, 0, sizeof(*link_ksettings));
 561                 return dev->ethtool_ops->get_link_ksettings(dev,
 562                                                             link_ksettings);
 563         }
 564
 565         /* driver doesn't support %ethtool_link_ksettings API. revert to
 566          * legacy %ethtool_cmd API, unless it's not supported either.
 567          * TODO: remove when ethtool_ops::get_settings disappears internally
 568          */
 569         if (!dev->ethtool_ops->get_settings)
 570                 return -EOPNOTSUPP;
 571
 572         memset(&cmd, 0, sizeof(cmd));
 573         cmd.cmd = ETHTOOL_GSET;
 574         err = dev->ethtool_ops->get_settings(dev, &cmd);
 575         if (err < 0)
 576                 return err;
 577
 578         /* we ignore deprecated fields transceiver/maxrxpkt/maxtxpkt
 579          */
 580         convert_legacy_settings_to_link_ksettings(link_ksettings, &cmd);
 581         return err;
 582 }
 583 EXPORT_SYMBOL(__ethtool_get_link_ksettings);
 584
 585 /* convert ethtool_link_usettings in user space to a kernel internal
 586  * ethtool_link_ksettings. return 0 on success, errno on error.
 587  */
 588 static int load_link_ksettings_from_user(struct ethtool_link_ksettings *to,
 589                                          const void __user *from)
 590 {
 591         struct ethtool_link_usettings link_usettings;
 592
 593         if (copy_from_user(&link_usettings, from, sizeof(link_usettings)))
 594                 return -EFAULT;
 595
 596         memcpy(&to->base, &link_usettings.base, sizeof(to->base));
 597         bitmap_from_arr32(to->link_modes.supported,
 598                           link_usettings.link_modes.supported,
 599                           __ETHTOOL_LINK_MODE_MASK_NBITS);
 600         bitmap_from_arr32(to->link_modes.advertising,
 601                           link_usettings.link_modes.advertising,
 602                           __ETHTOOL_LINK_MODE_MASK_NBITS);
 603         bitmap_from_arr32(to->link_modes.lp_advertising,
 604                           link_usettings.link_modes.lp_advertising,
 605                           __ETHTOOL_LINK_MODE_MASK_NBITS);
 606
 607         return 0;
 608 }
 609
 610 /* convert a kernel internal ethtool_link_ksettings to
 611  * ethtool_link_usettings in user space. return 0 on success, errno on
 612  * error.
 613  */
 614 static int
 615 store_link_ksettings_for_user(void __user *to,
 616                               const struct ethtool_link_ksettings *from)
 617 {
 618         struct ethtool_link_usettings link_usettings;
 619
 620         memcpy(&link_usettings.base, &from->base, sizeof(link_usettings));
 621         bitmap_to_arr32(link_usettings.link_modes.supported,
 622                         from->link_modes.supported,
 623                         __ETHTOOL_LINK_MODE_MASK_NBITS);
 624         bitmap_to_arr32(link_usettings.link_modes.advertising,
 625                         from->link_modes.advertising,
 626                         __ETHTOOL_LINK_MODE_MASK_NBITS);
 627         bitmap_to_arr32(link_usettings.link_modes.lp_advertising,
 628                         from->link_modes.lp_advertising,
 629                         __ETHTOOL_LINK_MODE_MASK_NBITS);
 630
 631         if (copy_to_user(to, &link_usettings, sizeof(link_usettings)))
 632                 return -EFAULT;
 633
 634         return 0;
 635 }
 636
 637 /* Query device for its ethtool_link_settings.
 638  *
 639  * Backward compatibility note: this function must fail when driver
 640  * does not implement ethtool::get_link_ksettings, even if legacy
 641  * ethtool_ops::get_settings is implemented. This tells new versions
 642  * of ethtool that they should use the legacy API %ETHTOOL_GSET for
 643  * this driver, so that they can correctly access the ethtool_cmd
 644  * deprecated fields (transceiver/maxrxpkt/maxtxpkt), until no driver
 645  * implements ethtool_ops::get_settings anymore.
 646  */
 647 static int ethtool_get_link_ksettings(struct net_device *dev,
 648                                       void __user *useraddr)
 649 {
 650         int err = 0;
 651         struct ethtool_link_ksettings link_ksettings;
 652
 653         ASSERT_RTNL();
 654
 655         if (!dev->ethtool_ops->get_link_ksettings)
 656                 return -EOPNOTSUPP;
 657
 658         /* handle bitmap nbits handshake */
 659         if (copy_from_user(&link_ksettings.base, useraddr,
 660                            sizeof(link_ksettings.base)))
 661                 return -EFAULT;
 662
 663         if (__ETHTOOL_LINK_MODE_MASK_NU32
 664             != link_ksettings.base.link_mode_masks_nwords) {
 665                 /* wrong link mode nbits requested */
 666                 memset(&link_ksettings, 0, sizeof(link_ksettings));
 667                 link_ksettings.base.cmd = ETHTOOL_GLINKSETTINGS;
 668                 /* send back number of words required as negative val */
 669                 compiletime_assert(__ETHTOOL_LINK_MODE_MASK_NU32 <= S8_MAX,
 670                                    "need too many bits for link modes!");
 671                 link_ksettings.base.link_mode_masks_nwords
 672                         = -((s8)__ETHTOOL_LINK_MODE_MASK_NU32);
 673
 674                 /* copy the base fields back to user, not the link
 675                  * mode bitmaps
 676                  */
 677                 if (copy_to_user(useraddr, &link_ksettings.base,
 678                                  sizeof(link_ksettings.base)))
 679                         return -EFAULT;
 680
 681                 return 0;
 682         }
 683
 684         /* handshake successful: user/kernel agree on
 685          * link_mode_masks_nwords
 686          */
 687
 688         memset(&link_ksettings, 0, sizeof(link_ksettings));
 689         err = dev->ethtool_ops->get_link_ksettings(dev, &link_ksettings);
 690         if (err < 0)
 691                 return err;
 692
 693         /* make sure we tell the right values to user */
 694         link_ksettings.base.cmd = ETHTOOL_GLINKSETTINGS;
 695         link_ksettings.base.link_mode_masks_nwords
 696                 = __ETHTOOL_LINK_MODE_MASK_NU32;
 697
 698         return store_link_ksettings_for_user(useraddr, &link_ksettings);
 699 }
 700
 701 /* Update device ethtool_link_settings.
 702  *
 703  * Backward compatibility note: this function must fail when driver
 704  * does not implement ethtool::set_link_ksettings, even if legacy
 705  * ethtool_ops::set_settings is implemented. This tells new versions
 706  * of ethtool that they should use the legacy API %ETHTOOL_SSET for
 707  * this driver, so that they can correctly update the ethtool_cmd
 708  * deprecated fields (transceiver/maxrxpkt/maxtxpkt), until no driver
 709  * implements ethtool_ops::get_settings anymore.
 710  */
 711 static int ethtool_set_link_ksettings(struct net_device *dev,
 712                                       void __user *useraddr)
 713 {
 714         int err;
 715         struct ethtool_link_ksettings link_ksettings;
 716
 717         ASSERT_RTNL();
 718
 719         if (!dev->ethtool_ops->set_link_ksettings)
 720                 return -EOPNOTSUPP;
 721
 722         /* make sure nbits field has expected value */
 723         if (copy_from_user(&link_ksettings.base, useraddr,
 724                            sizeof(link_ksettings.base)))
 725                 return -EFAULT;
 726
 727         if (__ETHTOOL_LINK_MODE_MASK_NU32
 728             != link_ksettings.base.link_mode_masks_nwords)
 729                 return -EINVAL;
 730
 731         /* copy the whole structure, now that we know it has expected
 732          * format
 733          */
 734         err = load_link_ksettings_from_user(&link_ksettings, useraddr);
 735         if (err)
 736                 return err;
 737
 738         /* re-check nwords field, just in case */
 739         if (__ETHTOOL_LINK_MODE_MASK_NU32
 740             != link_ksettings.base.link_mode_masks_nwords)
 741                 return -EINVAL;
 742
 743         return dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings);
 744 }
 745
 746 /* Query device for its ethtool_cmd settings.
 747  *
 748  * Backward compatibility note: for compatibility with legacy ethtool,
 749  * this has to work with both drivers implementing get_link_ksettings
 750  * API and drivers implementing get_settings API. When drivers
 751  * implement get_link_ksettings and report higher link mode bits, a
 752  * kernel warning is logged once (with name of 1st driver/device) to
 753  * recommend user to upgrade ethtool, but the command is successful
 754  * (only the lower link mode bits reported back to user).
 755  */
 756 static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
 757 {
 758         struct ethtool_cmd cmd;
 759
 760         ASSERT_RTNL();
 761
 762         if (dev->ethtool_ops->get_link_ksettings) {
 763                 /* First, use link_ksettings API if it is supported */
 764                 int err;
 765                 struct ethtool_link_ksettings link_ksettings;
 766
 767                 memset(&link_ksettings, 0, sizeof(link_ksettings));
 768                 err = dev->ethtool_ops->get_link_ksettings(dev,
 769                                                            &link_ksettings);
 770                 if (err < 0)
 771                         return err;
 772                 convert_link_ksettings_to_legacy_settings(&cmd,
 773                                                           &link_ksettings);
 774
 775                 /* send a sensible cmd tag back to user */
 776                 cmd.cmd = ETHTOOL_GSET;
 777         } else {
 778                 /* driver doesn't support %ethtool_link_ksettings
 779                  * API. revert to legacy %ethtool_cmd API, unless it's
 780                  * not supported either.
 781                  */
 782                 int err;
 783
 784                 if (!dev->ethtool_ops->get_settings)
 785                         return -EOPNOTSUPP;
 786
 787                 memset(&cmd, 0, sizeof(cmd));
 788                 cmd.cmd = ETHTOOL_GSET;
 789                 err = dev->ethtool_ops->get_settings(dev, &cmd);
 790                 if (err < 0)
 791                         return err;
 792         }
 793
 794         if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
 795                 return -EFAULT;
 796
 797         return 0;
 798 }
 799
 800 /* Update device link settings with given ethtool_cmd.
 801  *
 802  * Backward compatibility note: for compatibility with legacy ethtool,
 803  * this has to work with both drivers implementing set_link_ksettings
 804  * API and drivers implementing set_settings API. When drivers
 805  * implement set_link_ksettings and user's request updates deprecated
 806  * ethtool_cmd fields (transceiver/maxrxpkt/maxtxpkt), a kernel
 807  * warning is logged once (with name of 1st driver/device) to
 808  * recommend user to upgrade ethtool, and the request is rejected.
 809  */
 810 static int ethtool_set_settings(struct net_device *dev, void __user *useraddr)
 811 {
 812         struct ethtool_cmd cmd;
 813
 814         ASSERT_RTNL();
 815
 816         if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
 817                 return -EFAULT;
 818
 819         /* first, try new %ethtool_link_ksettings API. */
 820         if (dev->ethtool_ops->set_link_ksettings) {
 821                 struct ethtool_link_ksettings link_ksettings;
 822
 823                 if (!convert_legacy_settings_to_link_ksettings(&link_ksettings,
 824                                                                &cmd))
 825                         return -EINVAL;
 826
 827                 link_ksettings.base.cmd = ETHTOOL_SLINKSETTINGS;
 828                 link_ksettings.base.link_mode_masks_nwords
 829                         = __ETHTOOL_LINK_MODE_MASK_NU32;
 830                 return dev->ethtool_ops->set_link_ksettings(dev,
 831                                                             &link_ksettings);
 832         }
 833
 834         /* legacy %ethtool_cmd API */
 835
 836         /* TODO: return -EOPNOTSUPP when ethtool_ops::get_settings
 837          * disappears internally
 838          */
 839
 840         if (!dev->ethtool_ops->set_settings)
 841                 return -EOPNOTSUPP;
 842
 843         return dev->ethtool_ops->set_settings(dev, &cmd);
 844 }
 845
 846 static noinline_for_stack int ethtool_get_drvinfo(struct net_device *dev,
 847                                                   void __user *useraddr)
 848 {
 849         struct ethtool_drvinfo info;
 850         const struct ethtool_ops *ops = dev->ethtool_ops;
 851
 852         memset(&info, 0, sizeof(info));
 853         info.cmd = ETHTOOL_GDRVINFO;
 854         if (ops->get_drvinfo) {
 855                 ops->get_drvinfo(dev, &info);
 856         } else if (dev->dev.parent && dev->dev.parent->driver) {
 857                 strlcpy(info.bus_info, dev_name(dev->dev.parent),
 858                         sizeof(info.bus_info));
 859                 strlcpy(info.driver, dev->dev.parent->driver->name,
 860                         sizeof(info.driver));
 861         } else {
 862                 return -EOPNOTSUPP;
 863         }
 864
 865         /*
 866          * this method of obtaining string set info is deprecated;
 867          * Use ETHTOOL_GSSET_INFO instead.
 868          */
 869         if (ops->get_sset_count) {
 870                 int rc;
 871
 872                 rc = ops->get_sset_count(dev, ETH_SS_TEST);
 873                 if (rc >= 0)
 874                         info.testinfo_len = rc;
 875                 rc = ops->get_sset_count(dev, ETH_SS_STATS);
 876                 if (rc >= 0)
 877                         info.n_stats = rc;
 878                 rc = ops->get_sset_count(dev, ETH_SS_PRIV_FLAGS);
 879                 if (rc >= 0)
 880                         info.n_priv_flags = rc;
 881         }
 882         if (ops->get_regs_len)
 883                 info.regdump_len = ops->get_regs_len(dev);
 884         if (ops->get_eeprom_len)
 885                 info.eedump_len = ops->get_eeprom_len(dev);
 886
 887         if (copy_to_user(useraddr, &info, sizeof(info)))
 888                 return -EFAULT;
 889         return 0;
 890 }
 891
 892 static noinline_for_stack int ethtool_get_sset_info(struct net_device *dev,
 893                                                     void __user *useraddr)
 894 {
 895         struct ethtool_sset_info info;
 896         u64 sset_mask;
 897         int i, idx = 0, n_bits = 0, ret, rc;
 898         u32 *info_buf = NULL;
 899
 900         if (copy_from_user(&info, useraddr, sizeof(info)))
 901                 return -EFAULT;
 902
 903         /* store copy of mask, because we zero struct later on */
 904         sset_mask = info.sset_mask;
 905         if (!sset_mask)
 906                 return 0;
 907
 908         /* calculate size of return buffer */
 909         n_bits = hweight64(sset_mask);
 910
 911         memset(&info, 0, sizeof(info));
 912         info.cmd = ETHTOOL_GSSET_INFO;
 913
 914         info_buf = kzalloc(n_bits * sizeof(u32), GFP_USER);
 915         if (!info_buf)
 916                 return -ENOMEM;
 917
 918         /*
 919          * fill return buffer based on input bitmask and successful
 920          * get_sset_count return
 921          */
 922         for (i = 0; i < 64; i++) {
 923                 if (!(sset_mask & (1ULL << i)))
 924                         continue;
 925
 926                 rc = __ethtool_get_sset_count(dev, i);
 927                 if (rc >= 0) {
 928                         info.sset_mask |= (1ULL << i);
 929                         info_buf[idx++] = rc;
 930                 }
 931         }
 932
 933         ret = -EFAULT;
 934         if (copy_to_user(useraddr, &info, sizeof(info)))
 935                 goto out;
 936
 937         useraddr += offsetof(struct ethtool_sset_info, data);
 938         if (copy_to_user(useraddr, info_buf, idx * sizeof(u32)))
 939                 goto out;
 940
 941         ret = 0;
 942
 943 out:
 944         kfree(info_buf);
 945         return ret;
 946 }
 947
 948 static noinline_for_stack int ethtool_set_rxnfc(struct net_device *dev,
 949                                                 u32 cmd, void __user *useraddr)
 950 {
 951         struct ethtool_rxnfc info;
 952         size_t info_size = sizeof(info);
 953         int rc;
 954
 955         if (!dev->ethtool_ops->set_rxnfc)
 956                 return -EOPNOTSUPP;
 957
 958         /* struct ethtool_rxnfc was originally defined for
 959          * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
 960          * members.  User-space might still be using that
 961          * definition. */
 962         if (cmd == ETHTOOL_SRXFH)
 963                 info_size = (offsetof(struct ethtool_rxnfc, data) +
 964                              sizeof(info.data));
 965
 966         if (copy_from_user(&info, useraddr, info_size))
 967                 return -EFAULT;
 968
 969         rc = dev->ethtool_ops->set_rxnfc(dev, &info);
 970         if (rc)
 971                 return rc;
 972
 973         if (cmd == ETHTOOL_SRXCLSRLINS &&
 974             copy_to_user(useraddr, &info, info_size))
 975                 return -EFAULT;
 976
 977         return 0;
 978 }
 979
 980 static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,
 981                                                 u32 cmd, void __user *useraddr)
 982 {
 983         struct ethtool_rxnfc info;
 984         size_t info_size = sizeof(info);
 985         const struct ethtool_ops *ops = dev->ethtool_ops;
 986         int ret;
 987         void *rule_buf = NULL;
 988
 989         if (!ops->get_rxnfc)
 990                 return -EOPNOTSUPP;
 991
 992         /* struct ethtool_rxnfc was originally defined for
 993          * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
 994          * members.  User-space might still be using that
 995          * definition. */
 996         if (cmd == ETHTOOL_GRXFH)
 997                 info_size = (offsetof(struct ethtool_rxnfc, data) +
 998                              sizeof(info.data));
 999
1000         if (copy_from_user(&info, useraddr, info_size))
1001                 return -EFAULT;
1002
1003         /* If FLOW_RSS was requested then user-space must be using the
1004          * new definition, as FLOW_RSS is newer.
1005          */
1006         if (cmd == ETHTOOL_GRXFH && info.flow_type & FLOW_RSS) {
1007                 info_size = sizeof(info);
1008                 if (copy_from_user(&info, useraddr, info_size))
1009                         return -EFAULT;
1010                 /* Since malicious users may modify the original data,
1011                  * we need to check whether FLOW_RSS is still requested.
1012                  */
1013                 if (!(info.flow_type & FLOW_RSS))
1014                         return -EINVAL;
1015         }
1016
1017         if (info.cmd == ETHTOOL_GRXCLSRLALL) {
1018                 if (info.rule_cnt > 0) {
1019                         if (info.rule_cnt <= KMALLOC_MAX_SIZE / sizeof(u32))
1020                                 rule_buf = kzalloc(info.rule_cnt * sizeof(u32),
1021                                                    GFP_USER);
1022                         if (!rule_buf)
1023                                 return -ENOMEM;
1024                 }
1025         }
1026
1027         ret = ops->get_rxnfc(dev, &info, rule_buf);
1028         if (ret < 0)
1029                 goto err_out;
1030
1031         ret = -EFAULT;
1032         if (copy_to_user(useraddr, &info, info_size))
1033                 goto err_out;
1034
1035         if (rule_buf) {
1036                 useraddr += offsetof(struct ethtool_rxnfc, rule_locs);
1037                 if (copy_to_user(useraddr, rule_buf,
1038                                  info.rule_cnt * sizeof(u32)))
1039                         goto err_out;
1040         }
1041         ret = 0;
1042
1043 err_out:
1044         kfree(rule_buf);
1045
1046         return ret;
1047 }
1048
1049 static int ethtool_copy_validate_indir(u32 *indir, void __user *useraddr,
1050                                         struct ethtool_rxnfc *rx_rings,
1051                                         u32 size)
1052 {
1053         int i;
1054
1055         if (copy_from_user(indir, useraddr, size * sizeof(indir[0])))
1056                 return -EFAULT;
1057
1058         /* Validate ring indices */
1059         for (i = 0; i < size; i++)
1060                 if (indir[i] >= rx_rings->data)
1061                         return -EINVAL;
1062
1063         return 0;
1064 }
1065
1066 u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly;
1067
1068 void netdev_rss_key_fill(void *buffer, size_t len)
1069 {
1070         BUG_ON(len > sizeof(netdev_rss_key));
1071         net_get_random_once(netdev_rss_key, sizeof(netdev_rss_key));
1072         memcpy(buffer, netdev_rss_key, len);
1073 }
1074 EXPORT_SYMBOL(netdev_rss_key_fill);
1075
1076 static int ethtool_get_max_rxfh_channel(struct net_device *dev, u32 *max)
1077 {
1078         u32 dev_size, current_max = 0;
1079         u32 *indir;
1080         int ret;
1081
1082         if (!dev->ethtool_ops->get_rxfh_indir_size ||
1083             !dev->ethtool_ops->get_rxfh)
1084                 return -EOPNOTSUPP;
1085         dev_size = dev->ethtool_ops->get_rxfh_indir_size(dev);
1086         if (dev_size == 0)
1087                 return -EOPNOTSUPP;
1088
1089         indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
1090         if (!indir)
1091                 return -ENOMEM;
1092
1093         ret = dev->ethtool_ops->get_rxfh(dev, indir, NULL, NULL);
1094         if (ret)
1095                 goto out;
1096
1097         while (dev_size--)
1098                 current_max = max(current_max, indir[dev_size]);
1099
1100         *max = current_max;
1101
1102 out:
1103         kfree(indir);
1104         return ret;
1105 }
1106
1107 static noinline_for_stack int ethtool_get_rxfh_indir(struct net_device *dev,
1108                                                      void __user *useraddr)
1109 {
1110         u32 user_size, dev_size;
1111         u32 *indir;
1112         int ret;
1113
1114         if (!dev->ethtool_ops->get_rxfh_indir_size ||
1115             !dev->ethtool_ops->get_rxfh)
1116                 return -EOPNOTSUPP;
1117         dev_size = dev->ethtool_ops->get_rxfh_indir_size(dev);
1118         if (dev_size == 0)
1119                 return -EOPNOTSUPP;
1120
1121         if (copy_from_user(&user_size,
1122                            useraddr + offsetof(struct ethtool_rxfh_indir, size),
1123                            sizeof(user_size)))
1124                 return -EFAULT;
1125
1126         if (copy_to_user(useraddr + offsetof(struct ethtool_rxfh_indir, size),
1127                          &dev_size, sizeof(dev_size)))
1128                 return -EFAULT;
1129
1130         /* If the user buffer size is 0, this is just a query for the
1131          * device table size.  Otherwise, if it's smaller than the
1132          * device table size it's an error.
1133          */
1134         if (user_size < dev_size)
1135                 return user_size == 0 ? 0 : -EINVAL;
1136
1137         indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
1138         if (!indir)
1139                 return -ENOMEM;
1140
1141         ret = dev->ethtool_ops->get_rxfh(dev, indir, NULL, NULL);
1142         if (ret)
1143                 goto out;
1144
1145         if (copy_to_user(useraddr +
1146                          offsetof(struct ethtool_rxfh_indir, ring_index[0]),
1147                          indir, dev_size * sizeof(indir[0])))
1148                 ret = -EFAULT;
1149
1150 out:
1151         kfree(indir);
1152         return ret;
1153 }
1154
1155 static noinline_for_stack int ethtool_set_rxfh_indir(struct net_device *dev,
1156                                                      void __user *useraddr)
1157 {
1158         struct ethtool_rxnfc rx_rings;
1159         u32 user_size, dev_size, i;
1160         u32 *indir;
1161         const struct ethtool_ops *ops = dev->ethtool_ops;
1162         int ret;
1163         u32 ringidx_offset = offsetof(struct ethtool_rxfh_indir, ring_index[0]);
1164
1165         if (!ops->get_rxfh_indir_size || !ops->set_rxfh ||
1166             !ops->get_rxnfc)
1167                 return -EOPNOTSUPP;
1168
1169         dev_size = ops->get_rxfh_indir_size(dev);
1170         if (dev_size == 0)
1171                 return -EOPNOTSUPP;
1172
1173         if (copy_from_user(&user_size,
1174                            useraddr + offsetof(struct ethtool_rxfh_indir, size),
1175                            sizeof(user_size)))
1176                 return -EFAULT;
1177
1178         if (user_size != 0 && user_size != dev_size)
1179                 return -EINVAL;
1180
1181         indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
1182         if (!indir)
1183                 return -ENOMEM;
1184
1185         rx_rings.cmd = ETHTOOL_GRXRINGS;
1186         ret = ops->get_rxnfc(dev, &rx_rings, NULL);
1187         if (ret)
1188                 goto out;
1189
1190         if (user_size == 0) {
1191                 for (i = 0; i < dev_size; i++)
1192                         indir[i] = ethtool_rxfh_indir_default(i, rx_rings.data);
1193         } else {
1194                 ret = ethtool_copy_validate_indir(indir,
1195                                                   useraddr + ringidx_offset,
1196                                                   &rx_rings,
1197                                                   dev_size);
1198                 if (ret)
1199                         goto out;
1200         }
1201
1202         ret = ops->set_rxfh(dev, indir, NULL, ETH_RSS_HASH_NO_CHANGE);
1203         if (ret)
1204                 goto out;
1205
1206         /* indicate whether rxfh was set to default */
1207         if (user_size == 0)
1208                 dev->priv_flags &= ~IFF_RXFH_CONFIGURED;
1209         else
1210                 dev->priv_flags |= IFF_RXFH_CONFIGURED;
1211
1212 out:
1213         kfree(indir);
1214         return ret;
1215 }
1216
1217 static noinline_for_stack int ethtool_get_rxfh(struct net_device *dev,
1218                                                void __user *useraddr)
1219 {
1220         int ret;
1221         const struct ethtool_ops *ops = dev->ethtool_ops;
1222         u32 user_indir_size, user_key_size;
1223         u32 dev_indir_size = 0, dev_key_size = 0;
1224         struct ethtool_rxfh rxfh;
1225         u32 total_size;
1226         u32 indir_bytes;
1227         u32 *indir = NULL;
1228         u8 dev_hfunc = 0;
1229         u8 *hkey = NULL;
1230         u8 *rss_config;
1231
1232         if (!ops->get_rxfh)
1233                 return -EOPNOTSUPP;
1234
1235         if (ops->get_rxfh_indir_size)
1236                 dev_indir_size = ops->get_rxfh_indir_size(dev);
1237         if (ops->get_rxfh_key_size)
1238                 dev_key_size = ops->get_rxfh_key_size(dev);
1239
1240         if (copy_from_user(&rxfh, useraddr, sizeof(rxfh)))
1241                 return -EFAULT;
1242         user_indir_size = rxfh.indir_size;
1243         user_key_size = rxfh.key_size;
1244
1245         /* Check that reserved fields are 0 for now */
1246         if (rxfh.rsvd8[0] || rxfh.rsvd8[1] || rxfh.rsvd8[2] || rxfh.rsvd32)
1247                 return -EINVAL;
1248         /* Most drivers don't handle rss_context, check it's 0 as well */
1249         if (rxfh.rss_context && !ops->get_rxfh_context)
1250                 return -EOPNOTSUPP;
1251
1252         rxfh.indir_size = dev_indir_size;
1253         rxfh.key_size = dev_key_size;
1254         if (copy_to_user(useraddr, &rxfh, sizeof(rxfh)))
1255                 return -EFAULT;
1256
1257         if ((user_indir_size && (user_indir_size != dev_indir_size)) ||
1258             (user_key_size && (user_key_size != dev_key_size)))
1259                 return -EINVAL;
1260
1261         indir_bytes = user_indir_size * sizeof(indir[0]);
1262         total_size = indir_bytes + user_key_size;
1263         rss_config = kzalloc(total_size, GFP_USER);
1264         if (!rss_config)
1265                 return -ENOMEM;
1266
1267         if (user_indir_size)
1268                 indir = (u32 *)rss_config;
1269
1270         if (user_key_size)
1271                 hkey = rss_config + indir_bytes;
1272
1273         if (rxfh.rss_context)
1274                 ret = dev->ethtool_ops->get_rxfh_context(dev, indir, hkey,
1275                                                          &dev_hfunc,
1276                                                          rxfh.rss_context);
1277         else
1278                 ret = dev->ethtool_ops->get_rxfh(dev, indir, hkey, &dev_hfunc);
1279         if (ret)
1280                 goto out;
1281
1282         if (copy_to_user(useraddr + offsetof(struct ethtool_rxfh, hfunc),
1283                          &dev_hfunc, sizeof(rxfh.hfunc))) {
1284                 ret = -EFAULT;
1285         } else if (copy_to_user(useraddr +
1286                               offsetof(struct ethtool_rxfh, rss_config[0]),
1287                               rss_config, total_size)) {
1288                 ret = -EFAULT;
1289         }
1290 out:
1291         kfree(rss_config);
1292
1293         return ret;
1294 }
1295
1296 static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
1297                                                void __user *useraddr)
1298 {
1299         int ret;
1300         const struct ethtool_ops *ops = dev->ethtool_ops;
1301         struct ethtool_rxnfc rx_rings;
1302         struct ethtool_rxfh rxfh;
1303         u32 dev_indir_size = 0, dev_key_size = 0, i;
1304         u32 *indir = NULL, indir_bytes = 0;
1305         u8 *hkey = NULL;
1306         u8 *rss_config;
1307         u32 rss_cfg_offset = offsetof(struct ethtool_rxfh, rss_config[0]);
1308         bool delete = false;
1309
1310         if (!ops->get_rxnfc || !ops->set_rxfh)
1311                 return -EOPNOTSUPP;
1312
1313         if (ops->get_rxfh_indir_size)
1314                 dev_indir_size = ops->get_rxfh_indir_size(dev);
1315         if (ops->get_rxfh_key_size)
1316                 dev_key_size = ops->get_rxfh_key_size(dev);
1317
1318         if (copy_from_user(&rxfh, useraddr, sizeof(rxfh)))
1319                 return -EFAULT;
1320
1321         /* Check that reserved fields are 0 for now */
1322         if (rxfh.rsvd8[0] || rxfh.rsvd8[1] || rxfh.rsvd8[2] || rxfh.rsvd32)
1323                 return -EINVAL;
1324         /* Most drivers don't handle rss_context, check it's 0 as well */
1325         if (rxfh.rss_context && !ops->set_rxfh_context)
1326                 return -EOPNOTSUPP;
1327
1328         /* If either indir, hash key or function is valid, proceed further.
1329          * Must request at least one change: indir size, hash key or function.
1330          */
1331         if ((rxfh.indir_size &&
1332              rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE &&
1333              rxfh.indir_size != dev_indir_size) ||
1334             (rxfh.key_size && (rxfh.key_size != dev_key_size)) ||
1335             (rxfh.indir_size == ETH_RXFH_INDIR_NO_CHANGE &&
1336              rxfh.key_size == 0 && rxfh.hfunc == ETH_RSS_HASH_NO_CHANGE))
1337                 return -EINVAL;
1338
1339         if (rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE)
1340                 indir_bytes = dev_indir_size * sizeof(indir[0]);
1341
1342         rss_config = kzalloc(indir_bytes + rxfh.key_size, GFP_USER);
1343         if (!rss_config)
1344                 return -ENOMEM;
1345
1346         rx_rings.cmd = ETHTOOL_GRXRINGS;
1347         ret = ops->get_rxnfc(dev, &rx_rings, NULL);
1348         if (ret)
1349                 goto out;
1350
1351         /* rxfh.indir_size == 0 means reset the indir table to default (master
1352          * context) or delete the context (other RSS contexts).
1353          * rxfh.indir_size == ETH_RXFH_INDIR_NO_CHANGE means leave it unchanged.
1354          */
1355         if (rxfh.indir_size &&
1356             rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE) {
1357                 indir = (u32 *)rss_config;
1358                 ret = ethtool_copy_validate_indir(indir,
1359                                                   useraddr + rss_cfg_offset,
1360                                                   &rx_rings,
1361                                                   rxfh.indir_size);
1362                 if (ret)
1363                         goto out;
1364         } else if (rxfh.indir_size == 0) {
1365                 if (rxfh.rss_context == 0) {
1366                         indir = (u32 *)rss_config;
1367                         for (i = 0; i < dev_indir_size; i++)
1368                                 indir[i] = ethtool_rxfh_indir_default(i, rx_rings.data);
1369                 } else {
1370                         delete = true;
1371                 }
1372         }
1373
1374         if (rxfh.key_size) {
1375                 hkey = rss_config + indir_bytes;
1376                 if (copy_from_user(hkey,
1377                                    useraddr + rss_cfg_offset + indir_bytes,
1378                                    rxfh.key_size)) {
1379                         ret = -EFAULT;
1380                         goto out;
1381                 }
1382         }
1383
1384         if (rxfh.rss_context)
1385                 ret = ops->set_rxfh_context(dev, indir, hkey, rxfh.hfunc,
1386                                             &rxfh.rss_context, delete);
1387         else
1388                 ret = ops->set_rxfh(dev, indir, hkey, rxfh.hfunc);
1389         if (ret)
1390                 goto out;
1391
1392         if (copy_to_user(useraddr + offsetof(struct ethtool_rxfh, rss_context),
1393                          &rxfh.rss_context, sizeof(rxfh.rss_context)))
1394                 ret = -EFAULT;
1395
1396         if (!rxfh.rss_context) {
1397                 /* indicate whether rxfh was set to default */
1398                 if (rxfh.indir_size == 0)
1399                         dev->priv_flags &= ~IFF_RXFH_CONFIGURED;
1400                 else if (rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE)
1401                         dev->priv_flags |= IFF_RXFH_CONFIGURED;
1402         }
1403
1404 out:
1405         kfree(rss_config);
1406         return ret;
1407 }
1408
1409 static int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
1410 {
1411         struct ethtool_regs regs;
1412         const struct ethtool_ops *ops = dev->ethtool_ops;
1413         void *regbuf;
1414         int reglen, ret;
1415
1416         if (!ops->get_regs || !ops->get_regs_len)
1417                 return -EOPNOTSUPP;
1418
1419         if (copy_from_user(&regs, useraddr, sizeof(regs)))
1420                 return -EFAULT;
1421
1422         reglen = ops->get_regs_len(dev);
1423         if (regs.len > reglen)
1424                 regs.len = reglen;
1425
1426         regbuf = NULL;
1427         if (reglen) {
1428                 regbuf = vzalloc(reglen);
1429                 if (!regbuf)
1430                         return -ENOMEM;
1431         }
1432
1433         ops->get_regs(dev, &regs, regbuf);
1434
1435         ret = -EFAULT;
1436         if (copy_to_user(useraddr, &regs, sizeof(regs)))
1437                 goto out;
1438         useraddr += offsetof(struct ethtool_regs, data);
1439         if (regbuf && copy_to_user(useraddr, regbuf, regs.len))
1440                 goto out;
1441         ret = 0;
1442
1443  out:
1444         vfree(regbuf);
1445         return ret;
1446 }
1447
1448 static int ethtool_reset(struct net_device *dev, char __user *useraddr)
1449 {
1450         struct ethtool_value reset;
1451         int ret;
1452
1453         if (!dev->ethtool_ops->reset)
1454                 return -EOPNOTSUPP;
1455
1456         if (copy_from_user(&reset, useraddr, sizeof(reset)))
1457                 return -EFAULT;
1458
1459         ret = dev->ethtool_ops->reset(dev, &reset.data);
1460         if (ret)
1461                 return ret;
1462
1463         if (copy_to_user(useraddr, &reset, sizeof(reset)))
1464                 return -EFAULT;
1465         return 0;
1466 }
1467
1468 static int ethtool_get_wol(struct net_device *dev, char __user *useraddr)
1469 {
1470         struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
1471
1472         if (!dev->ethtool_ops->get_wol)
1473                 return -EOPNOTSUPP;
1474
1475         dev->ethtool_ops->get_wol(dev, &wol);
1476
1477         if (copy_to_user(useraddr, &wol, sizeof(wol)))
1478                 return -EFAULT;
1479         return 0;
1480 }
1481
1482 static int ethtool_set_wol(struct net_device *dev, char __user *useraddr)
1483 {
1484         struct ethtool_wolinfo wol;
1485
1486         if (!dev->ethtool_ops->set_wol)
1487                 return -EOPNOTSUPP;
1488
1489         if (copy_from_user(&wol, useraddr, sizeof(wol)))
1490                 return -EFAULT;
1491
1492         return dev->ethtool_ops->set_wol(dev, &wol);
1493 }
1494
1495 static int ethtool_get_eee(struct net_device *dev, char __user *useraddr)
1496 {
1497         struct ethtool_eee edata;
1498         int rc;
1499
1500         if (!dev->ethtool_ops->get_eee)
1501                 return -EOPNOTSUPP;
1502
1503         memset(&edata, 0, sizeof(struct ethtool_eee));
1504         edata.cmd = ETHTOOL_GEEE;
1505         rc = dev->ethtool_ops->get_eee(dev, &edata);
1506
1507         if (rc)
1508                 return rc;
1509
1510         if (copy_to_user(useraddr, &edata, sizeof(edata)))
1511                 return -EFAULT;
1512
1513         return 0;
1514 }
1515
1516 static int ethtool_set_eee(struct net_device *dev, char __user *useraddr)
1517 {
1518         struct ethtool_eee edata;
1519
1520         if (!dev->ethtool_ops->set_eee)
1521                 return -EOPNOTSUPP;
1522
1523         if (copy_from_user(&edata, useraddr, sizeof(edata)))
1524                 return -EFAULT;
1525
1526         return dev->ethtool_ops->set_eee(dev, &edata);
1527 }
1528
1529 static int ethtool_nway_reset(struct net_device *dev)
1530 {
1531         if (!dev->ethtool_ops->nway_reset)
1532                 return -EOPNOTSUPP;
1533
1534         return dev->ethtool_ops->nway_reset(dev);
1535 }
1536
1537 static int ethtool_get_link(struct net_device *dev, char __user *useraddr)
1538 {
1539         struct ethtool_value edata = { .cmd = ETHTOOL_GLINK };
1540
1541         if (!dev->ethtool_ops->get_link)
1542                 return -EOPNOTSUPP;
1543
1544         edata.data = netif_running(dev) && dev->ethtool_ops->get_link(dev);
1545
1546         if (copy_to_user(useraddr, &edata, sizeof(edata)))
1547                 return -EFAULT;
1548         return 0;
1549 }
1550
1551 static int ethtool_get_any_eeprom(struct net_device *dev, void __user *useraddr,
1552                                   int (*getter)(struct net_device *,
1553                                                 struct ethtool_eeprom *, u8 *),
1554                                   u32 total_len)
1555 {
1556         struct ethtool_eeprom eeprom;
1557         void __user *userbuf = useraddr + sizeof(eeprom);
1558         u32 bytes_remaining;
1559         u8 *data;
1560         int ret = 0;
1561
1562         if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
1563                 return -EFAULT;
1564
1565         /* Check for wrap and zero */
1566         if (eeprom.offset + eeprom.len <= eeprom.offset)
1567                 return -EINVAL;
1568
1569         /* Check for exceeding total eeprom len */
1570         if (eeprom.offset + eeprom.len > total_len)
1571                 return -EINVAL;
1572
1573         data = kmalloc(PAGE_SIZE, GFP_USER);
1574         if (!data)
1575                 return -ENOMEM;
1576
1577         bytes_remaining = eeprom.len;
1578         while (bytes_remaining > 0) {
1579                 eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);
1580
1581                 ret = getter(dev, &eeprom, data);
1582                 if (ret)
1583                         break;
1584                 if (copy_to_user(userbuf, data, eeprom.len)) {
1585                         ret = -EFAULT;
1586                         break;
1587                 }
1588                 userbuf += eeprom.len;
1589                 eeprom.offset += eeprom.len;
1590                 bytes_remaining -= eeprom.len;
1591         }
1592
1593         eeprom.len = userbuf - (useraddr + sizeof(eeprom));
1594         eeprom.offset -= eeprom.len;
1595         if (copy_to_user(useraddr, &eeprom, sizeof(eeprom)))
1596                 ret = -EFAULT;
1597
1598         kfree(data);
1599         return ret;
1600 }
1601
1602 static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
1603 {
1604         const struct ethtool_ops *ops = dev->ethtool_ops;
1605
1606         if (!ops->get_eeprom || !ops->get_eeprom_len ||
1607             !ops->get_eeprom_len(dev))
1608                 return -EOPNOTSUPP;
1609
1610         return ethtool_get_any_eeprom(dev, useraddr, ops->get_eeprom,
1611                                       ops->get_eeprom_len(dev));
1612 }
1613
1614 static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
1615 {
1616         struct ethtool_eeprom eeprom;
1617         const struct ethtool_ops *ops = dev->ethtool_ops;
1618         void __user *userbuf = useraddr + sizeof(eeprom);
1619         u32 bytes_remaining;
1620         u8 *data;
1621         int ret = 0;
1622
1623         if (!ops->set_eeprom || !ops->get_eeprom_len ||
1624             !ops->get_eeprom_len(dev))
1625                 return -EOPNOTSUPP;
1626
1627         if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
1628                 return -EFAULT;
1629
1630         /* Check for wrap and zero */
1631         if (eeprom.offset + eeprom.len <= eeprom.offset)
1632                 return -EINVAL;
1633
1634         /* Check for exceeding total eeprom len */
1635         if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
1636                 return -EINVAL;
1637
1638         data = kmalloc(PAGE_SIZE, GFP_USER);
1639         if (!data)
1640                 return -ENOMEM;
1641
1642         bytes_remaining = eeprom.len;
1643         while (bytes_remaining > 0) {
1644                 eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);
1645
1646                 if (copy_from_user(data, userbuf, eeprom.len)) {
1647                         ret = -EFAULT;
1648                         break;
1649                 }
1650                 ret = ops->set_eeprom(dev, &eeprom, data);
1651                 if (ret)
1652                         break;
1653                 userbuf += eeprom.len;
1654                 eeprom.offset += eeprom.len;
1655                 bytes_remaining -= eeprom.len;
1656         }
1657
1658         kfree(data);
1659         return ret;
1660 }
1661
1662 static noinline_for_stack int ethtool_get_coalesce(struct net_device *dev,
1663                                                    void __user *useraddr)
1664 {
1665         struct ethtool_coalesce coalesce = { .cmd = ETHTOOL_GCOALESCE };
1666
1667         if (!dev->ethtool_ops->get_coalesce)
1668                 return -EOPNOTSUPP;
1669
1670         dev->ethtool_ops->get_coalesce(dev, &coalesce);
1671
1672         if (copy_to_user(useraddr, &coalesce, sizeof(coalesce)))
1673                 return -EFAULT;
1674         return 0;
1675 }
1676
1677 static noinline_for_stack int ethtool_set_coalesce(struct net_device *dev,
1678                                                    void __user *useraddr)
1679 {
1680         struct ethtool_coalesce coalesce;
1681
1682         if (!dev->ethtool_ops->set_coalesce)
1683                 return -EOPNOTSUPP;
1684
1685         if (copy_from_user(&coalesce, useraddr, sizeof(coalesce)))
1686                 return -EFAULT;
1687
1688         return dev->ethtool_ops->set_coalesce(dev, &coalesce);
1689 }
1690
1691 static int ethtool_get_ringparam(struct net_device *dev, void __user *useraddr)
1692 {
1693         struct ethtool_ringparam ringparam = { .cmd = ETHTOOL_GRINGPARAM };
1694
1695         if (!dev->ethtool_ops->get_ringparam)
1696                 return -EOPNOTSUPP;
1697
1698         dev->ethtool_ops->get_ringparam(dev, &ringparam);
1699
1700         if (copy_to_user(useraddr, &ringparam, sizeof(ringparam)))
1701                 return -EFAULT;
1702         return 0;
1703 }
1704
1705 static int ethtool_set_ringparam(struct net_device *dev, void __user *useraddr)
1706 {
1707         struct ethtool_ringparam ringparam, max = { .cmd = ETHTOOL_GRINGPARAM };
1708
1709         if (!dev->ethtool_ops->set_ringparam || !dev->ethtool_ops->get_ringparam)
1710                 return -EOPNOTSUPP;
1711
1712         if (copy_from_user(&ringparam, useraddr, sizeof(ringparam)))
1713                 return -EFAULT;
1714
1715         dev->ethtool_ops->get_ringparam(dev, &max);
1716
1717         /* ensure new ring parameters are within the maximums */
1718         if (ringparam.rx_pending > max.rx_max_pending ||
1719             ringparam.rx_mini_pending > max.rx_mini_max_pending ||
1720             ringparam.rx_jumbo_pending > max.rx_jumbo_max_pending ||
1721             ringparam.tx_pending > max.tx_max_pending)
1722                 return -EINVAL;
1723
1724         return dev->ethtool_ops->set_ringparam(dev, &ringparam);
1725 }
1726
1727 static noinline_for_stack int ethtool_get_channels(struct net_device *dev,
1728                                                    void __user *useraddr)
1729 {
1730         struct ethtool_channels channels = { .cmd = ETHTOOL_GCHANNELS };
1731
1732         if (!dev->ethtool_ops->get_channels)
1733                 return -EOPNOTSUPP;
1734
1735         dev->ethtool_ops->get_channels(dev, &channels);
1736
1737         if (copy_to_user(useraddr, &channels, sizeof(channels)))
1738                 return -EFAULT;
1739         return 0;
1740 }
1741
1742 static noinline_for_stack int ethtool_set_channels(struct net_device *dev,
1743                                                    void __user *useraddr)
1744 {
1745         struct ethtool_channels channels, max = { .cmd = ETHTOOL_GCHANNELS };
1746         u32 max_rx_in_use = 0;
1747
1748         if (!dev->ethtool_ops->set_channels || !dev->ethtool_ops->get_channels)
1749                 return -EOPNOTSUPP;
1750
1751         if (copy_from_user(&channels, useraddr, sizeof(channels)))
1752                 return -EFAULT;
1753
1754         dev->ethtool_ops->get_channels(dev, &max);
1755
1756         /* ensure new counts are within the maximums */
1757         if ((channels.rx_count > max.max_rx) ||
1758             (channels.tx_count > max.max_tx) ||
1759             (channels.combined_count > max.max_combined) ||
1760             (channels.other_count > max.max_other))
1761                 return -EINVAL;
1762
1763         /* ensure the new Rx count fits within the configured Rx flow
1764          * indirection table settings */
1765         if (netif_is_rxfh_configured(dev) &&
1766             !ethtool_get_max_rxfh_channel(dev, &max_rx_in_use) &&
1767             (channels.combined_count + channels.rx_count) <= max_rx_in_use)
1768             return -EINVAL;
1769
1770         return dev->ethtool_ops->set_channels(dev, &channels);
1771 }
1772
1773 static int ethtool_get_pauseparam(struct net_device *dev, void __user *useraddr)
1774 {
1775         struct ethtool_pauseparam pauseparam = { ETHTOOL_GPAUSEPARAM };
1776
1777         if (!dev->ethtool_ops->get_pauseparam)
1778                 return -EOPNOTSUPP;
1779
1780         dev->ethtool_ops->get_pauseparam(dev, &pauseparam);
1781
1782         if (copy_to_user(useraddr, &pauseparam, sizeof(pauseparam)))
1783                 return -EFAULT;
1784         return 0;
1785 }
1786
1787 static int ethtool_set_pauseparam(struct net_device *dev, void __user *useraddr)
1788 {
1789         struct ethtool_pauseparam pauseparam;
1790
1791         if (!dev->ethtool_ops->set_pauseparam)
1792                 return -EOPNOTSUPP;
1793
1794         if (copy_from_user(&pauseparam, useraddr, sizeof(pauseparam)))
1795                 return -EFAULT;
1796
1797         return dev->ethtool_ops->set_pauseparam(dev, &pauseparam);
1798 }
1799
1800 static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
1801 {
1802         struct ethtool_test test;
1803         const struct ethtool_ops *ops = dev->ethtool_ops;
1804         u64 *data;
1805         int ret, test_len;
1806
1807         if (!ops->self_test || !ops->get_sset_count)
1808                 return -EOPNOTSUPP;
1809
1810         test_len = ops->get_sset_count(dev, ETH_SS_TEST);
1811         if (test_len < 0)
1812                 return test_len;
1813         WARN_ON(test_len == 0);
1814
1815         if (copy_from_user(&test, useraddr, sizeof(test)))
1816                 return -EFAULT;
1817
1818         test.len = test_len;
1819         data = kmalloc_array(test_len, sizeof(u64), GFP_USER);
1820         if (!data)
1821                 return -ENOMEM;
1822
1823         ops->self_test(dev, &test, data);
1824
1825         ret = -EFAULT;
1826         if (copy_to_user(useraddr, &test, sizeof(test)))
1827                 goto out;
1828         useraddr += sizeof(test);
1829         if (copy_to_user(useraddr, data, test.len * sizeof(u64)))
1830                 goto out;
1831         ret = 0;
1832
1833  out:
1834         kfree(data);
1835         return ret;
1836 }
1837
1838 static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
1839 {
1840         struct ethtool_gstrings gstrings;
1841         u8 *data;
1842         int ret;
1843
1844         if (copy_from_user(&gstrings, useraddr, sizeof(gstrings)))
1845                 return -EFAULT;
1846
1847         ret = __ethtool_get_sset_count(dev, gstrings.string_set);
1848         if (ret < 0)
1849                 return ret;
1850         if (ret > S32_MAX / ETH_GSTRING_LEN)
1851                 return -ENOMEM;
1852         WARN_ON_ONCE(!ret);
1853
1854         gstrings.len = ret;
1855         data = vzalloc(gstrings.len * ETH_GSTRING_LEN);
1856         if (gstrings.len && !data)
1857                 return -ENOMEM;
1858
1859         __ethtool_get_strings(dev, gstrings.string_set, data);
1860
1861         ret = -EFAULT;
1862         if (copy_to_user(useraddr, &gstrings, sizeof(gstrings)))
1863                 goto out;
1864         useraddr += sizeof(gstrings);
1865         if (gstrings.len &&
1866             copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))
1867                 goto out;
1868         ret = 0;
1869
1870 out:
1871         vfree(data);
1872         return ret;
1873 }
1874
1875 static int ethtool_phys_id(struct net_device *dev, void __user *useraddr)
1876 {
1877         struct ethtool_value id;
1878         static bool busy;
1879         const struct ethtool_ops *ops = dev->ethtool_ops;
1880         int rc;
1881
1882         if (!ops->set_phys_id)
1883                 return -EOPNOTSUPP;
1884
1885         if (busy)
1886                 return -EBUSY;
1887
1888         if (copy_from_user(&id, useraddr, sizeof(id)))
1889                 return -EFAULT;
1890
1891         rc = ops->set_phys_id(dev, ETHTOOL_ID_ACTIVE);
1892         if (rc < 0)
1893                 return rc;
1894
1895         /* Drop the RTNL lock while waiting, but prevent reentry or
1896          * removal of the device.
1897          */
1898         busy = true;
1899         dev_hold(dev);
1900         rtnl_unlock();
1901
1902         if (rc == 0) {
1903                 /* Driver will handle this itself */
1904                 schedule_timeout_interruptible(
1905                         id.data ? (id.data * HZ) : MAX_SCHEDULE_TIMEOUT);
1906         } else {
1907                 /* Driver expects to be called at twice the frequency in rc */
1908                 int n = rc * 2, i, interval = HZ / n;
1909
1910                 /* Count down seconds */
1911                 do {
1912                         /* Count down iterations per second */
1913                         i = n;
1914                         do {
1915                                 rtnl_lock();
1916                                 rc = ops->set_phys_id(dev,
1917                                     (i & 1) ? ETHTOOL_ID_OFF : ETHTOOL_ID_ON);
1918                                 rtnl_unlock();
1919                                 if (rc)
1920                                         break;
1921                                 schedule_timeout_interruptible(interval);
1922                         } while (!signal_pending(current) && --i != 0);
1923                 } while (!signal_pending(current) &&
1924                          (id.data == 0 || --id.data != 0));
1925         }
1926
1927         rtnl_lock();
1928         dev_put(dev);
1929         busy = false;
1930
1931         (void) ops->set_phys_id(dev, ETHTOOL_ID_INACTIVE);
1932         return rc;
1933 }
1934
1935 static int ethtool_get_stats(struct net_device *dev, void __user *useraddr)
1936 {
1937         struct ethtool_stats stats;
1938         const struct ethtool_ops *ops = dev->ethtool_ops;
1939         u64 *data;
1940         int ret, n_stats;
1941
1942         if (!ops->get_ethtool_stats || !ops->get_sset_count)
1943                 return -EOPNOTSUPP;
1944
1945         n_stats = ops->get_sset_count(dev, ETH_SS_STATS);
1946         if (n_stats < 0)
1947                 return n_stats;
1948         if (n_stats > S32_MAX / sizeof(u64))
1949                 return -ENOMEM;
1950         WARN_ON_ONCE(!n_stats);
1951         if (copy_from_user(&stats, useraddr, sizeof(stats)))
1952                 return -EFAULT;
1953
1954         stats.n_stats = n_stats;
1955         data = vzalloc(n_stats * sizeof(u64));
1956         if (n_stats && !data)
1957                 return -ENOMEM;
1958
1959         ops->get_ethtool_stats(dev, &stats, data);
1960
1961         ret = -EFAULT;
1962         if (copy_to_user(useraddr, &stats, sizeof(stats)))
1963                 goto out;
1964         useraddr += sizeof(stats);
1965         if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
1966                 goto out;
1967         ret = 0;
1968
1969  out:
1970         vfree(data);
1971         return ret;
1972 }
1973
1974 static int ethtool_get_phy_stats(struct net_device *dev, void __user *useraddr)
1975 {
1976         const struct ethtool_ops *ops = dev->ethtool_ops;
1977         struct phy_device *phydev = dev->phydev;
1978         struct ethtool_stats stats;
1979         u64 *data;
1980         int ret, n_stats;
1981
1982         if (!phydev && (!ops->get_ethtool_phy_stats || !ops->get_sset_count))
1983                 return -EOPNOTSUPP;
1984
1985         if (dev->phydev && !ops->get_ethtool_phy_stats)
1986                 n_stats = phy_ethtool_get_sset_count(dev->phydev);
1987         else
1988                 n_stats = ops->get_sset_count(dev, ETH_SS_PHY_STATS);
1989         if (n_stats < 0)
1990                 return n_stats;
1991         if (n_stats > S32_MAX / sizeof(u64))
1992                 return -ENOMEM;
1993         WARN_ON_ONCE(!n_stats);
1994
1995         if (copy_from_user(&stats, useraddr, sizeof(stats)))
1996                 return -EFAULT;
1997
1998         stats.n_stats = n_stats;
1999         data = vzalloc(n_stats * sizeof(u64));
2000         if (n_stats && !data)
2001                 return -ENOMEM;
2002
2003         if (dev->phydev && !ops->get_ethtool_phy_stats) {
2004                 ret = phy_ethtool_get_stats(dev->phydev, &stats, data);
2005                 if (ret < 0)
2006                         return ret;
2007         } else {
2008                 ops->get_ethtool_phy_stats(dev, &stats, data);
2009         }
2010
2011         ret = -EFAULT;
2012         if (copy_to_user(useraddr, &stats, sizeof(stats)))
2013                 goto out;
2014         useraddr += sizeof(stats);
2015         if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
2016                 goto out;
2017         ret = 0;
2018
2019  out:
2020         vfree(data);
2021         return ret;
2022 }
2023
2024 static int ethtool_get_perm_addr(struct net_device *dev, void __user *useraddr)
2025 {
2026         struct ethtool_perm_addr epaddr;
2027
2028         if (copy_from_user(&epaddr, useraddr, sizeof(epaddr)))
2029                 return -EFAULT;
2030
2031         if (epaddr.size < dev->addr_len)
2032                 return -ETOOSMALL;
2033         epaddr.size = dev->addr_len;
2034
2035         if (copy_to_user(useraddr, &epaddr, sizeof(epaddr)))
2036                 return -EFAULT;
2037         useraddr += sizeof(epaddr);
2038         if (copy_to_user(useraddr, dev->perm_addr, epaddr.size))
2039                 return -EFAULT;
2040         return 0;
2041 }
2042
2043 static int ethtool_get_value(struct net_device *dev, char __user *useraddr,
2044                              u32 cmd, u32 (*actor)(struct net_device *))
2045 {
2046         struct ethtool_value edata = { .cmd = cmd };
2047
2048         if (!actor)
2049                 return -EOPNOTSUPP;
2050
2051         edata.data = actor(dev);
2052
2053         if (copy_to_user(useraddr, &edata, sizeof(edata)))
2054                 return -EFAULT;
2055         return 0;
2056 }
2057
2058 static int ethtool_set_value_void(struct net_device *dev, char __user *useraddr,
2059                              void (*actor)(struct net_device *, u32))
2060 {
2061         struct ethtool_value edata;
2062
2063         if (!actor)
2064                 return -EOPNOTSUPP;
2065
2066         if (copy_from_user(&edata, useraddr, sizeof(edata)))
2067                 return -EFAULT;
2068
2069         actor(dev, edata.data);
2070         return 0;
2071 }
2072
2073 static int ethtool_set_value(struct net_device *dev, char __user *useraddr,
2074                              int (*actor)(struct net_device *, u32))
2075 {
2076         struct ethtool_value edata;
2077
2078         if (!actor)
2079                 return -EOPNOTSUPP;
2080
2081         if (copy_from_user(&edata, useraddr, sizeof(edata)))
2082                 return -EFAULT;
2083
2084         return actor(dev, edata.data);
2085 }
2086
2087 static noinline_for_stack int ethtool_flash_device(struct net_device *dev,
2088                                                    char __user *useraddr)
2089 {
2090         struct ethtool_flash efl;
2091
2092         if (copy_from_user(&efl, useraddr, sizeof(efl)))
2093                 return -EFAULT;
2094
2095         if (!dev->ethtool_ops->flash_device)
2096                 return -EOPNOTSUPP;
2097
2098         efl.data[ETHTOOL_FLASH_MAX_FILENAME - 1] = 0;
2099
2100         return dev->ethtool_ops->flash_device(dev, &efl);
2101 }
2102
2103 static int ethtool_set_dump(struct net_device *dev,
2104                         void __user *useraddr)
2105 {
2106         struct ethtool_dump dump;
2107
2108         if (!dev->ethtool_ops->set_dump)
2109                 return -EOPNOTSUPP;
2110
2111         if (copy_from_user(&dump, useraddr, sizeof(dump)))
2112                 return -EFAULT;
2113
2114         return dev->ethtool_ops->set_dump(dev, &dump);
2115 }
2116
2117 static int ethtool_get_dump_flag(struct net_device *dev,
2118                                 void __user *useraddr)
2119 {
2120         int ret;
2121         struct ethtool_dump dump;
2122         const struct ethtool_ops *ops = dev->ethtool_ops;
2123
2124         if (!ops->get_dump_flag)
2125                 return -EOPNOTSUPP;
2126
2127         if (copy_from_user(&dump, useraddr, sizeof(dump)))
2128                 return -EFAULT;
2129
2130         ret = ops->get_dump_flag(dev, &dump);
2131         if (ret)
2132                 return ret;
2133
2134         if (copy_to_user(useraddr, &dump, sizeof(dump)))
2135                 return -EFAULT;
2136         return 0;
2137 }
2138
2139 static int ethtool_get_dump_data(struct net_device *dev,
2140                                 void __user *useraddr)
2141 {
2142         int ret;
2143         __u32 len;
2144         struct ethtool_dump dump, tmp;
2145         const struct ethtool_ops *ops = dev->ethtool_ops;
2146         void *data = NULL;
2147
2148         if (!ops->get_dump_data || !ops->get_dump_flag)
2149                 return -EOPNOTSUPP;
2150
2151         if (copy_from_user(&dump, useraddr, sizeof(dump)))
2152                 return -EFAULT;
2153
2154         memset(&tmp, 0, sizeof(tmp));
2155         tmp.cmd = ETHTOOL_GET_DUMP_FLAG;
2156         ret = ops->get_dump_flag(dev, &tmp);
2157         if (ret)
2158                 return ret;
2159
2160         len = min(tmp.len, dump.len);
2161         if (!len)
2162                 return -EFAULT;
2163
2164         /* Don't ever let the driver think there's more space available
2165          * than it requested with .get_dump_flag().
2166          */
2167         dump.len = len;
2168
2169         /* Always allocate enough space to hold the whole thing so that the
2170          * driver does not need to check the length and bother with partial
2171          * dumping.
2172          */
2173         data = vzalloc(tmp.len);
2174         if (!data)
2175                 return -ENOMEM;
2176         ret = ops->get_dump_data(dev, &dump, data);
2177         if (ret)
2178                 goto out;
2179
2180         /* There are two sane possibilities:
2181          * 1. The driver's .get_dump_data() does not touch dump.len.
2182          * 2. Or it may set dump.len to how much it really writes, which
2183          *    should be tmp.len (or len if it can do a partial dump).
2184          * In any case respond to userspace with the actual length of data
2185          * it's receiving.
2186          */
2187         WARN_ON(dump.len != len && dump.len != tmp.len);
2188         dump.len = len;
2189
2190         if (copy_to_user(useraddr, &dump, sizeof(dump))) {
2191                 ret = -EFAULT;
2192                 goto out;
2193         }
2194         useraddr += offsetof(struct ethtool_dump, data);
2195         if (copy_to_user(useraddr, data, len))
2196                 ret = -EFAULT;
2197 out:
2198         vfree(data);
2199         return ret;
2200 }
2201
2202 static int ethtool_get_ts_info(struct net_device *dev, void __user *useraddr)
2203 {
2204         int err = 0;
2205         struct ethtool_ts_info info;
2206         const struct ethtool_ops *ops = dev->ethtool_ops;
2207         struct phy_device *phydev = dev->phydev;
2208
2209         memset(&info, 0, sizeof(info));
2210         info.cmd = ETHTOOL_GET_TS_INFO;
2211
2212         if (phydev && phydev->drv && phydev->drv->ts_info) {
2213                 err = phydev->drv->ts_info(phydev, &info);
2214         } else if (ops->get_ts_info) {
2215                 err = ops->get_ts_info(dev, &info);
2216         } else {
2217                 info.so_timestamping =
2218                         SOF_TIMESTAMPING_RX_SOFTWARE |
2219                         SOF_TIMESTAMPING_SOFTWARE;
2220                 info.phc_index = -1;
2221         }
2222
2223         if (err)
2224                 return err;
2225
2226         if (copy_to_user(useraddr, &info, sizeof(info)))
2227                 err = -EFAULT;
2228
2229         return err;
2230 }
2231
2232 static int __ethtool_get_module_info(struct net_device *dev,
2233                                      struct ethtool_modinfo *modinfo)
2234 {
2235         const struct ethtool_ops *ops = dev->ethtool_ops;
2236         struct phy_device *phydev = dev->phydev;
2237
2238         if (dev->sfp_bus)
2239                 return sfp_get_module_info(dev->sfp_bus, modinfo);
2240
2241         if (phydev && phydev->drv && phydev->drv->module_info)
2242                 return phydev->drv->module_info(phydev, modinfo);
2243
2244         if (ops->get_module_info)
2245                 return ops->get_module_info(dev, modinfo);
2246
2247         return -EOPNOTSUPP;
2248 }
2249
2250 static int ethtool_get_module_info(struct net_device *dev,
2251                                    void __user *useraddr)
2252 {
2253         int ret;
2254         struct ethtool_modinfo modinfo;
2255
2256         if (copy_from_user(&modinfo, useraddr, sizeof(modinfo)))
2257                 return -EFAULT;
2258
2259         ret = __ethtool_get_module_info(dev, &modinfo);
2260         if (ret)
2261                 return ret;
2262
2263         if (copy_to_user(useraddr, &modinfo, sizeof(modinfo)))
2264                 return -EFAULT;
2265
2266         return 0;
2267 }
2268
2269 static int __ethtool_get_module_eeprom(struct net_device *dev,
2270                                        struct ethtool_eeprom *ee, u8 *data)
2271 {
2272         const struct ethtool_ops *ops = dev->ethtool_ops;
2273         struct phy_device *phydev = dev->phydev;
2274
2275         if (dev->sfp_bus)
2276                 return sfp_get_module_eeprom(dev->sfp_bus, ee, data);
2277
2278         if (phydev && phydev->drv && phydev->drv->module_eeprom)
2279                 return phydev->drv->module_eeprom(phydev, ee, data);
2280
2281         if (ops->get_module_eeprom)
2282                 return ops->get_module_eeprom(dev, ee, data);
2283
2284         return -EOPNOTSUPP;
2285 }
2286
2287 static int ethtool_get_module_eeprom(struct net_device *dev,
2288                                      void __user *useraddr)
2289 {
2290         int ret;
2291         struct ethtool_modinfo modinfo;
2292
2293         ret = __ethtool_get_module_info(dev, &modinfo);
2294         if (ret)
2295                 return ret;
2296
2297         return ethtool_get_any_eeprom(dev, useraddr,
2298                                       __ethtool_get_module_eeprom,
2299                                       modinfo.eeprom_len);
2300 }
2301
2302 static int ethtool_tunable_valid(const struct ethtool_tunable *tuna)
2303 {
2304         switch (tuna->id) {
2305         case ETHTOOL_RX_COPYBREAK:
2306         case ETHTOOL_TX_COPYBREAK:
2307                 if (tuna->len != sizeof(u32) ||
2308                     tuna->type_id != ETHTOOL_TUNABLE_U32)
2309                         return -EINVAL;
2310                 break;
2311         case ETHTOOL_PFC_PREVENTION_TOUT:
2312                 if (tuna->len != sizeof(u16) ||
2313                     tuna->type_id != ETHTOOL_TUNABLE_U16)
2314                         return -EINVAL;
2315                 break;
2316         default:
2317                 return -EINVAL;
2318         }
2319
2320         return 0;
2321 }
2322
2323 static int ethtool_get_tunable(struct net_device *dev, void __user *useraddr)
2324 {
2325         int ret;
2326         struct ethtool_tunable tuna;
2327         const struct ethtool_ops *ops = dev->ethtool_ops;
2328         void *data;
2329
2330         if (!ops->get_tunable)
2331                 return -EOPNOTSUPP;
2332         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2333                 return -EFAULT;
2334         ret = ethtool_tunable_valid(&tuna);
2335         if (ret)
2336                 return ret;
2337         data = kmalloc(tuna.len, GFP_USER);
2338         if (!data)
2339                 return -ENOMEM;
2340         ret = ops->get_tunable(dev, &tuna, data);
2341         if (ret)
2342                 goto out;
2343         useraddr += sizeof(tuna);
2344         ret = -EFAULT;
2345         if (copy_to_user(useraddr, data, tuna.len))
2346                 goto out;
2347         ret = 0;
2348
2349 out:
2350         kfree(data);
2351         return ret;
2352 }
2353
2354 static int ethtool_set_tunable(struct net_device *dev, void __user *useraddr)
2355 {
2356         int ret;
2357         struct ethtool_tunable tuna;
2358         const struct ethtool_ops *ops = dev->ethtool_ops;
2359         void *data;
2360
2361         if (!ops->set_tunable)
2362                 return -EOPNOTSUPP;
2363         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2364                 return -EFAULT;
2365         ret = ethtool_tunable_valid(&tuna);
2366         if (ret)
2367                 return ret;
2368         useraddr += sizeof(tuna);
2369         data = memdup_user(useraddr, tuna.len);
2370         if (IS_ERR(data))
2371                 return PTR_ERR(data);
2372         ret = ops->set_tunable(dev, &tuna, data);
2373
2374         kfree(data);
2375         return ret;
2376 }
2377
2378 static int ethtool_get_per_queue_coalesce(struct net_device *dev,
2379                                           void __user *useraddr,
2380                                           struct ethtool_per_queue_op *per_queue_opt)
2381 {
2382         u32 bit;
2383         int ret;
2384         DECLARE_BITMAP(queue_mask, MAX_NUM_QUEUE);
2385
2386         if (!dev->ethtool_ops->get_per_queue_coalesce)
2387                 return -EOPNOTSUPP;
2388
2389         useraddr += sizeof(*per_queue_opt);
2390
2391         bitmap_from_arr32(queue_mask, per_queue_opt->queue_mask,
2392                           MAX_NUM_QUEUE);
2393
2394         for_each_set_bit(bit, queue_mask, MAX_NUM_QUEUE) {
2395                 struct ethtool_coalesce coalesce = { .cmd = ETHTOOL_GCOALESCE };
2396
2397                 ret = dev->ethtool_ops->get_per_queue_coalesce(dev, bit, &coalesce);
2398                 if (ret != 0)
2399                         return ret;
2400                 if (copy_to_user(useraddr, &coalesce, sizeof(coalesce)))
2401                         return -EFAULT;
2402                 useraddr += sizeof(coalesce);
2403         }
2404
2405         return 0;
2406 }
2407
2408 static int ethtool_set_per_queue_coalesce(struct net_device *dev,
2409                                           void __user *useraddr,
2410                                           struct ethtool_per_queue_op *per_queue_opt)
2411 {
2412         u32 bit;
2413         int i, ret = 0;
2414         int n_queue;
2415         struct ethtool_coalesce *backup = NULL, *tmp = NULL;
2416         DECLARE_BITMAP(queue_mask, MAX_NUM_QUEUE);
2417
2418         if ((!dev->ethtool_ops->set_per_queue_coalesce) ||
2419             (!dev->ethtool_ops->get_per_queue_coalesce))
2420                 return -EOPNOTSUPP;
2421
2422         useraddr += sizeof(*per_queue_opt);
2423
2424         bitmap_from_arr32(queue_mask, per_queue_opt->queue_mask, MAX_NUM_QUEUE);
2425         n_queue = bitmap_weight(queue_mask, MAX_NUM_QUEUE);
2426         tmp = backup = kmalloc_array(n_queue, sizeof(*backup), GFP_KERNEL);
2427         if (!backup)
2428                 return -ENOMEM;
2429
2430         for_each_set_bit(bit, queue_mask, MAX_NUM_QUEUE) {
2431                 struct ethtool_coalesce coalesce;
2432
2433                 ret = dev->ethtool_ops->get_per_queue_coalesce(dev, bit, tmp);
2434                 if (ret != 0)
2435                         goto roll_back;
2436
2437                 tmp++;
2438
2439                 if (copy_from_user(&coalesce, useraddr, sizeof(coalesce))) {
2440                         ret = -EFAULT;
2441                         goto roll_back;
2442                 }
2443
2444                 ret = dev->ethtool_ops->set_per_queue_coalesce(dev, bit, &coalesce);
2445                 if (ret != 0)
2446                         goto roll_back;
2447
2448                 useraddr += sizeof(coalesce);
2449         }
2450
2451 roll_back:
2452         if (ret != 0) {
2453                 tmp = backup;
2454                 for_each_set_bit(i, queue_mask, bit) {
2455                         dev->ethtool_ops->set_per_queue_coalesce(dev, i, tmp);
2456                         tmp++;
2457                 }
2458         }
2459         kfree(backup);
2460
2461         return ret;
2462 }
2463
2464 static int ethtool_set_per_queue(struct net_device *dev, void __user *useraddr)
2465 {
2466         struct ethtool_per_queue_op per_queue_opt;
2467
2468         if (copy_from_user(&per_queue_opt, useraddr, sizeof(per_queue_opt)))
2469                 return -EFAULT;
2470
2471         switch (per_queue_opt.sub_command) {
2472         case ETHTOOL_GCOALESCE:
2473                 return ethtool_get_per_queue_coalesce(dev, useraddr, &per_queue_opt);
2474         case ETHTOOL_SCOALESCE:
2475                 return ethtool_set_per_queue_coalesce(dev, useraddr, &per_queue_opt);
2476         default:
2477                 return -EOPNOTSUPP;
2478         };
2479 }
2480
2481 static int ethtool_phy_tunable_valid(const struct ethtool_tunable *tuna)
2482 {
2483         switch (tuna->id) {
2484         case ETHTOOL_PHY_DOWNSHIFT:
2485                 if (tuna->len != sizeof(u8) ||
2486                     tuna->type_id != ETHTOOL_TUNABLE_U8)
2487                         return -EINVAL;
2488                 break;
2489         default:
2490                 return -EINVAL;
2491         }
2492
2493         return 0;
2494 }
2495
2496 static int get_phy_tunable(struct net_device *dev, void __user *useraddr)
2497 {
2498         int ret;
2499         struct ethtool_tunable tuna;
2500         struct phy_device *phydev = dev->phydev;
2501         void *data;
2502
2503         if (!(phydev && phydev->drv && phydev->drv->get_tunable))
2504                 return -EOPNOTSUPP;
2505
2506         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2507                 return -EFAULT;
2508         ret = ethtool_phy_tunable_valid(&tuna);
2509         if (ret)
2510                 return ret;
2511         data = kmalloc(tuna.len, GFP_USER);
2512         if (!data)
2513                 return -ENOMEM;
2514         mutex_lock(&phydev->lock);
2515         ret = phydev->drv->get_tunable(phydev, &tuna, data);
2516         mutex_unlock(&phydev->lock);
2517         if (ret)
2518                 goto out;
2519         useraddr += sizeof(tuna);
2520         ret = -EFAULT;
2521         if (copy_to_user(useraddr, data, tuna.len))
2522                 goto out;
2523         ret = 0;
2524
2525 out:
2526         kfree(data);
2527         return ret;
2528 }
2529
2530 static int set_phy_tunable(struct net_device *dev, void __user *useraddr)
2531 {
2532         int ret;
2533         struct ethtool_tunable tuna;
2534         struct phy_device *phydev = dev->phydev;
2535         void *data;
2536
2537         if (!(phydev && phydev->drv && phydev->drv->set_tunable))
2538                 return -EOPNOTSUPP;
2539         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2540                 return -EFAULT;
2541         ret = ethtool_phy_tunable_valid(&tuna);
2542         if (ret)
2543                 return ret;
2544         useraddr += sizeof(tuna);
2545         data = memdup_user(useraddr, tuna.len);
2546         if (IS_ERR(data))
2547                 return PTR_ERR(data);
2548         mutex_lock(&phydev->lock);
2549         ret = phydev->drv->set_tunable(phydev, &tuna, data);
2550         mutex_unlock(&phydev->lock);
2551
2552         kfree(data);
2553         return ret;
2554 }
2555
2556 static int ethtool_get_fecparam(struct net_device *dev, void __user *useraddr)
2557 {
2558         struct ethtool_fecparam fecparam = { ETHTOOL_GFECPARAM };
2559         int rc;
2560
2561         if (!dev->ethtool_ops->get_fecparam)
2562                 return -EOPNOTSUPP;
2563
2564         rc = dev->ethtool_ops->get_fecparam(dev, &fecparam);
2565         if (rc)
2566                 return rc;
2567
2568         if (copy_to_user(useraddr, &fecparam, sizeof(fecparam)))
2569                 return -EFAULT;
2570         return 0;
2571 }
2572
2573 static int ethtool_set_fecparam(struct net_device *dev, void __user *useraddr)
2574 {
2575         struct ethtool_fecparam fecparam;
2576
2577         if (!dev->ethtool_ops->set_fecparam)
2578                 return -EOPNOTSUPP;
2579
2580         if (copy_from_user(&fecparam, useraddr, sizeof(fecparam)))
2581                 return -EFAULT;
2582
2583         return dev->ethtool_ops->set_fecparam(dev, &fecparam);
2584 }
2585
2586 /* The main entry point in this file.  Called from net/core/dev_ioctl.c */
2587
2588 int dev_ethtool(struct net *net, struct ifreq *ifr)
2589 {
2590         struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
2591         void __user *useraddr = ifr->ifr_data;
2592         u32 ethcmd, sub_cmd;
2593         int rc;
2594         netdev_features_t old_features;
2595
2596         if (!dev || !netif_device_present(dev))
2597                 return -ENODEV;
2598
2599         if (copy_from_user(&ethcmd, useraddr, sizeof(ethcmd)))
2600                 return -EFAULT;
2601
2602         if (ethcmd == ETHTOOL_PERQUEUE) {
2603                 if (copy_from_user(&sub_cmd, useraddr + sizeof(ethcmd), sizeof(sub_cmd)))
2604                         return -EFAULT;
2605         } else {
2606                 sub_cmd = ethcmd;
2607         }
2608         /* Allow some commands to be done by anyone */
2609         switch (sub_cmd) {
2610         case ETHTOOL_GSET:
2611         case ETHTOOL_GDRVINFO:
2612         case ETHTOOL_GMSGLVL:
2613         case ETHTOOL_GLINK:
2614         case ETHTOOL_GCOALESCE:
2615         case ETHTOOL_GRINGPARAM:
2616         case ETHTOOL_GPAUSEPARAM:
2617         case ETHTOOL_GRXCSUM:
2618         case ETHTOOL_GTXCSUM:
2619         case ETHTOOL_GSG:
2620         case ETHTOOL_GSSET_INFO:
2621         case ETHTOOL_GSTRINGS:
2622         case ETHTOOL_GSTATS:
2623         case ETHTOOL_GPHYSTATS:
2624         case ETHTOOL_GTSO:
2625         case ETHTOOL_GPERMADDR:
2626         case ETHTOOL_GGSO:
2627         case ETHTOOL_GGRO:
2628         case ETHTOOL_GFLAGS:
2629         case ETHTOOL_GPFLAGS:
2630         case ETHTOOL_GRXFH:
2631         case ETHTOOL_GRXRINGS:
2632         case ETHTOOL_GRXCLSRLCNT:
2633         case ETHTOOL_GRXCLSRULE:
2634         case ETHTOOL_GRXCLSRLALL:
2635         case ETHTOOL_GRXFHINDIR:
2636         case ETHTOOL_GRSSH:
2637         case ETHTOOL_GFEATURES:
2638         case ETHTOOL_GCHANNELS:
2639         case ETHTOOL_GET_TS_INFO:
2640         case ETHTOOL_GEEE:
2641         case ETHTOOL_GTUNABLE:
2642         case ETHTOOL_PHY_GTUNABLE:
2643         case ETHTOOL_GLINKSETTINGS:
2644         case ETHTOOL_GFECPARAM:
2645                 break;
2646         default:
2647                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2648                         return -EPERM;
2649         }
2650
2651         if (dev->ethtool_ops->begin) {
2652                 rc = dev->ethtool_ops->begin(dev);
2653                 if (rc  < 0)
2654                         return rc;
2655         }
2656         old_features = dev->features;
2657
2658         switch (ethcmd) {
2659         case ETHTOOL_GSET:
2660                 rc = ethtool_get_settings(dev, useraddr);
2661                 break;
2662         case ETHTOOL_SSET:
2663                 rc = ethtool_set_settings(dev, useraddr);
2664                 break;
2665         case ETHTOOL_GDRVINFO:
2666                 rc = ethtool_get_drvinfo(dev, useraddr);
2667                 break;
2668         case ETHTOOL_GREGS:
2669                 rc = ethtool_get_regs(dev, useraddr);
2670                 break;
2671         case ETHTOOL_GWOL:
2672                 rc = ethtool_get_wol(dev, useraddr);
2673                 break;
2674         case ETHTOOL_SWOL:
2675                 rc = ethtool_set_wol(dev, useraddr);
2676                 break;
2677         case ETHTOOL_GMSGLVL:
2678                 rc = ethtool_get_value(dev, useraddr, ethcmd,
2679                                        dev->ethtool_ops->get_msglevel);
2680                 break;
2681         case ETHTOOL_SMSGLVL:
2682                 rc = ethtool_set_value_void(dev, useraddr,
2683                                        dev->ethtool_ops->set_msglevel);
2684                 break;
2685         case ETHTOOL_GEEE:
2686                 rc = ethtool_get_eee(dev, useraddr);
2687                 break;
2688         case ETHTOOL_SEEE:
2689                 rc = ethtool_set_eee(dev, useraddr);
2690                 break;
2691         case ETHTOOL_NWAY_RST:
2692                 rc = ethtool_nway_reset(dev);
2693                 break;
2694         case ETHTOOL_GLINK:
2695                 rc = ethtool_get_link(dev, useraddr);
2696                 break;
2697         case ETHTOOL_GEEPROM:
2698                 rc = ethtool_get_eeprom(dev, useraddr);
2699                 break;
2700         case ETHTOOL_SEEPROM:
2701                 rc = ethtool_set_eeprom(dev, useraddr);
2702                 break;
2703         case ETHTOOL_GCOALESCE:
2704                 rc = ethtool_get_coalesce(dev, useraddr);
2705                 break;
2706         case ETHTOOL_SCOALESCE:
2707                 rc = ethtool_set_coalesce(dev, useraddr);
2708                 break;
2709         case ETHTOOL_GRINGPARAM:
2710                 rc = ethtool_get_ringparam(dev, useraddr);
2711                 break;
2712         case ETHTOOL_SRINGPARAM:
2713                 rc = ethtool_set_ringparam(dev, useraddr);
2714                 break;
2715         case ETHTOOL_GPAUSEPARAM:
2716                 rc = ethtool_get_pauseparam(dev, useraddr);
2717                 break;
2718         case ETHTOOL_SPAUSEPARAM:
2719                 rc = ethtool_set_pauseparam(dev, useraddr);
2720                 break;
2721         case ETHTOOL_TEST:
2722                 rc = ethtool_self_test(dev, useraddr);
2723                 break;
2724         case ETHTOOL_GSTRINGS:
2725                 rc = ethtool_get_strings(dev, useraddr);
2726                 break;
2727         case ETHTOOL_PHYS_ID:
2728                 rc = ethtool_phys_id(dev, useraddr);
2729                 break;
2730         case ETHTOOL_GSTATS:
2731                 rc = ethtool_get_stats(dev, useraddr);
2732                 break;
2733         case ETHTOOL_GPERMADDR:
2734                 rc = ethtool_get_perm_addr(dev, useraddr);
2735                 break;
2736         case ETHTOOL_GFLAGS:
2737                 rc = ethtool_get_value(dev, useraddr, ethcmd,
2738                                         __ethtool_get_flags);
2739                 break;
2740         case ETHTOOL_SFLAGS:
2741                 rc = ethtool_set_value(dev, useraddr, __ethtool_set_flags);
2742                 break;
2743         case ETHTOOL_GPFLAGS:
2744                 rc = ethtool_get_value(dev, useraddr, ethcmd,
2745                                        dev->ethtool_ops->get_priv_flags);
2746                 break;
2747         case ETHTOOL_SPFLAGS:
2748                 rc = ethtool_set_value(dev, useraddr,
2749                                        dev->ethtool_ops->set_priv_flags);
2750                 break;
2751         case ETHTOOL_GRXFH:
2752         case ETHTOOL_GRXRINGS:
2753         case ETHTOOL_GRXCLSRLCNT:
2754         case ETHTOOL_GRXCLSRULE:
2755         case ETHTOOL_GRXCLSRLALL:
2756                 rc = ethtool_get_rxnfc(dev, ethcmd, useraddr);
2757                 break;
2758         case ETHTOOL_SRXFH:
2759         case ETHTOOL_SRXCLSRLDEL:
2760         case ETHTOOL_SRXCLSRLINS:
2761                 rc = ethtool_set_rxnfc(dev, ethcmd, useraddr);
2762                 break;
2763         case ETHTOOL_FLASHDEV:
2764                 rc = ethtool_flash_device(dev, useraddr);
2765                 break;
2766         case ETHTOOL_RESET:
2767                 rc = ethtool_reset(dev, useraddr);
2768                 break;
2769         case ETHTOOL_GSSET_INFO:
2770                 rc = ethtool_get_sset_info(dev, useraddr);
2771                 break;
2772         case ETHTOOL_GRXFHINDIR:
2773                 rc = ethtool_get_rxfh_indir(dev, useraddr);
2774                 break;
2775         case ETHTOOL_SRXFHINDIR:
2776                 rc = ethtool_set_rxfh_indir(dev, useraddr);
2777                 break;
2778         case ETHTOOL_GRSSH:
2779                 rc = ethtool_get_rxfh(dev, useraddr);
2780                 break;
2781         case ETHTOOL_SRSSH:
2782                 rc = ethtool_set_rxfh(dev, useraddr);
2783                 break;
2784         case ETHTOOL_GFEATURES:
2785                 rc = ethtool_get_features(dev, useraddr);
2786                 break;
2787         case ETHTOOL_SFEATURES:
2788                 rc = ethtool_set_features(dev, useraddr);
2789                 break;
2790         case ETHTOOL_GTXCSUM:
2791         case ETHTOOL_GRXCSUM:
2792         case ETHTOOL_GSG:
2793         case ETHTOOL_GTSO:
2794         case ETHTOOL_GGSO:
2795         case ETHTOOL_GGRO:
2796                 rc = ethtool_get_one_feature(dev, useraddr, ethcmd);
2797                 break;
2798         case ETHTOOL_STXCSUM:
2799         case ETHTOOL_SRXCSUM:
2800         case ETHTOOL_SSG:
2801         case ETHTOOL_STSO:
2802         case ETHTOOL_SGSO:
2803         case ETHTOOL_SGRO:
2804                 rc = ethtool_set_one_feature(dev, useraddr, ethcmd);
2805                 break;
2806         case ETHTOOL_GCHANNELS:
2807                 rc = ethtool_get_channels(dev, useraddr);
2808                 break;
2809         case ETHTOOL_SCHANNELS:
2810                 rc = ethtool_set_channels(dev, useraddr);
2811                 break;
2812         case ETHTOOL_SET_DUMP:
2813                 rc = ethtool_set_dump(dev, useraddr);
2814                 break;
2815         case ETHTOOL_GET_DUMP_FLAG:
2816                 rc = ethtool_get_dump_flag(dev, useraddr);
2817                 break;
2818         case ETHTOOL_GET_DUMP_DATA:
2819                 rc = ethtool_get_dump_data(dev, useraddr);
2820                 break;
2821         case ETHTOOL_GET_TS_INFO:
2822                 rc = ethtool_get_ts_info(dev, useraddr);
2823                 break;
2824         case ETHTOOL_GMODULEINFO:
2825                 rc = ethtool_get_module_info(dev, useraddr);
2826                 break;
2827         case ETHTOOL_GMODULEEEPROM:
2828                 rc = ethtool_get_module_eeprom(dev, useraddr);
2829                 break;
2830         case ETHTOOL_GTUNABLE:
2831                 rc = ethtool_get_tunable(dev, useraddr);
2832                 break;
2833         case ETHTOOL_STUNABLE:
2834                 rc = ethtool_set_tunable(dev, useraddr);
2835                 break;
2836         case ETHTOOL_GPHYSTATS:
2837                 rc = ethtool_get_phy_stats(dev, useraddr);
2838                 break;
2839         case ETHTOOL_PERQUEUE:
2840                 rc = ethtool_set_per_queue(dev, useraddr);
2841                 break;
2842         case ETHTOOL_GLINKSETTINGS:
2843                 rc = ethtool_get_link_ksettings(dev, useraddr);
2844                 break;
2845         case ETHTOOL_SLINKSETTINGS:
2846                 rc = ethtool_set_link_ksettings(dev, useraddr);
2847                 break;
2848         case ETHTOOL_PHY_GTUNABLE:
2849                 rc = get_phy_tunable(dev, useraddr);
2850                 break;
2851         case ETHTOOL_PHY_STUNABLE:
2852                 rc = set_phy_tunable(dev, useraddr);
2853                 break;
2854         case ETHTOOL_GFECPARAM:
2855                 rc = ethtool_get_fecparam(dev, useraddr);
2856                 break;
2857         case ETHTOOL_SFECPARAM:
2858                 rc = ethtool_set_fecparam(dev, useraddr);
2859                 break;
2860         default:
2861                 rc = -EOPNOTSUPP;
2862         }
2863
2864         if (dev->ethtool_ops->complete)
2865                 dev->ethtool_ops->complete(dev);
2866
2867         if (old_features != dev->features)
2868                 netdev_features_change(dev);
2869
2870         return rc;
2871 }