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/slab.h>
  26 #include <linux/rtnetlink.h>
  27 #include <linux/sched/signal.h>
  28 #include <linux/net.h>
  29
  30 /*
  31  * Some useful ethtool_ops methods that're device independent.
  32  * If we find that all drivers want to do the same thing here,
  33  * we can turn these into dev_() function calls.
  34  */
  35
  36 u32 ethtool_op_get_link(struct net_device *dev)
  37 {
  38         return netif_carrier_ok(dev) ? 1 : 0;
  39 }
  40 EXPORT_SYMBOL(ethtool_op_get_link);
  41
  42 int ethtool_op_get_ts_info(struct net_device *dev, struct ethtool_ts_info *info)
  43 {
  44         info->so_timestamping =
  45                 SOF_TIMESTAMPING_TX_SOFTWARE |
  46                 SOF_TIMESTAMPING_RX_SOFTWARE |
  47                 SOF_TIMESTAMPING_SOFTWARE;
  48         info->phc_index = -1;
  49         return 0;
  50 }
  51 EXPORT_SYMBOL(ethtool_op_get_ts_info);
  52
  53 /* Handlers for each ethtool command */
  54
  55 #define ETHTOOL_DEV_FEATURE_WORDS       ((NETDEV_FEATURE_COUNT + 31) / 32)
  56
  57 static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN] = {
  58         [NETIF_F_SG_BIT] =               "tx-scatter-gather",
  59         [NETIF_F_IP_CSUM_BIT] =          "tx-checksum-ipv4",
  60         [NETIF_F_HW_CSUM_BIT] =          "tx-checksum-ip-generic",
  61         [NETIF_F_IPV6_CSUM_BIT] =        "tx-checksum-ipv6",
  62         [NETIF_F_HIGHDMA_BIT] =          "highdma",
  63         [NETIF_F_FRAGLIST_BIT] =         "tx-scatter-gather-fraglist",
  64         [NETIF_F_HW_VLAN_CTAG_TX_BIT] =  "tx-vlan-hw-insert",
  65
  66         [NETIF_F_HW_VLAN_CTAG_RX_BIT] =  "rx-vlan-hw-parse",
  67         [NETIF_F_HW_VLAN_CTAG_FILTER_BIT] = "rx-vlan-filter",
  68         [NETIF_F_HW_VLAN_STAG_TX_BIT] =  "tx-vlan-stag-hw-insert",
  69         [NETIF_F_HW_VLAN_STAG_RX_BIT] =  "rx-vlan-stag-hw-parse",
  70         [NETIF_F_HW_VLAN_STAG_FILTER_BIT] = "rx-vlan-stag-filter",
  71         [NETIF_F_VLAN_CHALLENGED_BIT] =  "vlan-challenged",
  72         [NETIF_F_GSO_BIT] =              "tx-generic-segmentation",
  73         [NETIF_F_LLTX_BIT] =             "tx-lockless",
  74         [NETIF_F_NETNS_LOCAL_BIT] =      "netns-local",
  75         [NETIF_F_GRO_BIT] =              "rx-gro",
  76         [NETIF_F_LRO_BIT] =              "rx-lro",
  77
  78         [NETIF_F_TSO_BIT] =              "tx-tcp-segmentation",
  79         [NETIF_F_GSO_ROBUST_BIT] =       "tx-gso-robust",
  80         [NETIF_F_TSO_ECN_BIT] =          "tx-tcp-ecn-segmentation",
  81         [NETIF_F_TSO_MANGLEID_BIT] =     "tx-tcp-mangleid-segmentation",
  82         [NETIF_F_TSO6_BIT] =             "tx-tcp6-segmentation",
  83         [NETIF_F_FSO_BIT] =              "tx-fcoe-segmentation",
  84         [NETIF_F_GSO_GRE_BIT] =          "tx-gre-segmentation",
  85         [NETIF_F_GSO_GRE_CSUM_BIT] =     "tx-gre-csum-segmentation",
  86         [NETIF_F_GSO_IPXIP4_BIT] =       "tx-ipxip4-segmentation",
  87         [NETIF_F_GSO_IPXIP6_BIT] =       "tx-ipxip6-segmentation",
  88         [NETIF_F_GSO_UDP_TUNNEL_BIT] =   "tx-udp_tnl-segmentation",
  89         [NETIF_F_GSO_UDP_TUNNEL_CSUM_BIT] = "tx-udp_tnl-csum-segmentation",
  90         [NETIF_F_GSO_PARTIAL_BIT] =      "tx-gso-partial",
  91         [NETIF_F_GSO_SCTP_BIT] =         "tx-sctp-segmentation",
  92         [NETIF_F_GSO_ESP_BIT] =          "tx-esp-segmentation",
  93
  94         [NETIF_F_FCOE_CRC_BIT] =         "tx-checksum-fcoe-crc",
  95         [NETIF_F_SCTP_CRC_BIT] =        "tx-checksum-sctp",
  96         [NETIF_F_FCOE_MTU_BIT] =         "fcoe-mtu",
  97         [NETIF_F_NTUPLE_BIT] =           "rx-ntuple-filter",
  98         [NETIF_F_RXHASH_BIT] =           "rx-hashing",
  99         [NETIF_F_RXCSUM_BIT] =           "rx-checksum",
 100         [NETIF_F_NOCACHE_COPY_BIT] =     "tx-nocache-copy",
 101         [NETIF_F_LOOPBACK_BIT] =         "loopback",
 102         [NETIF_F_RXFCS_BIT] =            "rx-fcs",
 103         [NETIF_F_RXALL_BIT] =            "rx-all",
 104         [NETIF_F_HW_L2FW_DOFFLOAD_BIT] = "l2-fwd-offload",
 105         [NETIF_F_HW_TC_BIT] =            "hw-tc-offload",
 106         [NETIF_F_HW_ESP_BIT] =           "esp-hw-offload",
 107         [NETIF_F_HW_ESP_TX_CSUM_BIT] =   "esp-tx-csum-hw-offload",
 108         [NETIF_F_RX_UDP_TUNNEL_PORT_BIT] =       "rx-udp_tunnel-port-offload",
 109 };
 110
 111 static const char
 112 rss_hash_func_strings[ETH_RSS_HASH_FUNCS_COUNT][ETH_GSTRING_LEN] = {
 113         [ETH_RSS_HASH_TOP_BIT] =        "toeplitz",
 114         [ETH_RSS_HASH_XOR_BIT] =        "xor",
 115         [ETH_RSS_HASH_CRC32_BIT] =      "crc32",
 116 };
 117
 118 static const char
 119 tunable_strings[__ETHTOOL_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
 120         [ETHTOOL_ID_UNSPEC]     = "Unspec",
 121         [ETHTOOL_RX_COPYBREAK]  = "rx-copybreak",
 122         [ETHTOOL_TX_COPYBREAK]  = "tx-copybreak",
 123 };
 124
 125 static const char
 126 phy_tunable_strings[__ETHTOOL_PHY_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
 127         [ETHTOOL_ID_UNSPEC]     = "Unspec",
 128         [ETHTOOL_PHY_DOWNSHIFT] = "phy-downshift",
 129 };
 130
 131 static int ethtool_get_features(struct net_device *dev, void __user *useraddr)
 132 {
 133         struct ethtool_gfeatures cmd = {
 134                 .cmd = ETHTOOL_GFEATURES,
 135                 .size = ETHTOOL_DEV_FEATURE_WORDS,
 136         };
 137         struct ethtool_get_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
 138         u32 __user *sizeaddr;
 139         u32 copy_size;
 140         int i;
 141
 142         /* in case feature bits run out again */
 143         BUILD_BUG_ON(ETHTOOL_DEV_FEATURE_WORDS * sizeof(u32) > sizeof(netdev_features_t));
 144
 145         for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
 146                 features[i].available = (u32)(dev->hw_features >> (32 * i));
 147                 features[i].requested = (u32)(dev->wanted_features >> (32 * i));
 148                 features[i].active = (u32)(dev->features >> (32 * i));
 149                 features[i].never_changed =
 150                         (u32)(NETIF_F_NEVER_CHANGE >> (32 * i));
 151         }
 152
 153         sizeaddr = useraddr + offsetof(struct ethtool_gfeatures, size);
 154         if (get_user(copy_size, sizeaddr))
 155                 return -EFAULT;
 156
 157         if (copy_size > ETHTOOL_DEV_FEATURE_WORDS)
 158                 copy_size = ETHTOOL_DEV_FEATURE_WORDS;
 159
 160         if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
 161                 return -EFAULT;
 162         useraddr += sizeof(cmd);
 163         if (copy_to_user(useraddr, features, copy_size * sizeof(*features)))
 164                 return -EFAULT;
 165
 166         return 0;
 167 }
 168
 169 static int ethtool_set_features(struct net_device *dev, void __user *useraddr)
 170 {
 171         struct ethtool_sfeatures cmd;
 172         struct ethtool_set_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
 173         netdev_features_t wanted = 0, valid = 0;
 174         int i, ret = 0;
 175
 176         if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
 177                 return -EFAULT;
 178         useraddr += sizeof(cmd);
 179
 180         if (cmd.size != ETHTOOL_DEV_FEATURE_WORDS)
 181                 return -EINVAL;
 182
 183         if (copy_from_user(features, useraddr, sizeof(features)))
 184                 return -EFAULT;
 185
 186         for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
 187                 valid |= (netdev_features_t)features[i].valid << (32 * i);
 188                 wanted |= (netdev_features_t)features[i].requested << (32 * i);
 189         }
 190
 191         if (valid & ~NETIF_F_ETHTOOL_BITS)
 192                 return -EINVAL;
 193
 194         if (valid & ~dev->hw_features) {
 195                 valid &= dev->hw_features;
 196                 ret |= ETHTOOL_F_UNSUPPORTED;
 197         }
 198
 199         dev->wanted_features &= ~valid;
 200         dev->wanted_features |= wanted & valid;
 201         __netdev_update_features(dev);
 202
 203         if ((dev->wanted_features ^ dev->features) & valid)
 204                 ret |= ETHTOOL_F_WISH;
 205
 206         return ret;
 207 }
 208
 209 static int phy_get_sset_count(struct phy_device *phydev)
 210 {
 211         int ret;
 212
 213         if (phydev->drv->get_sset_count &&
 214             phydev->drv->get_strings &&
 215             phydev->drv->get_stats) {
 216                 mutex_lock(&phydev->lock);
 217                 ret = phydev->drv->get_sset_count(phydev);
 218                 mutex_unlock(&phydev->lock);
 219
 220                 return ret;
 221         }
 222
 223         return -EOPNOTSUPP;
 224 }
 225
 226 static int __ethtool_get_sset_count(struct net_device *dev, int sset)
 227 {
 228         const struct ethtool_ops *ops = dev->ethtool_ops;
 229
 230         if (sset == ETH_SS_FEATURES)
 231                 return ARRAY_SIZE(netdev_features_strings);
 232
 233         if (sset == ETH_SS_RSS_HASH_FUNCS)
 234                 return ARRAY_SIZE(rss_hash_func_strings);
 235
 236         if (sset == ETH_SS_TUNABLES)
 237                 return ARRAY_SIZE(tunable_strings);
 238
 239         if (sset == ETH_SS_PHY_TUNABLES)
 240                 return ARRAY_SIZE(phy_tunable_strings);
 241
 242         if (sset == ETH_SS_PHY_STATS) {
 243                 if (dev->phydev)
 244                         return phy_get_sset_count(dev->phydev);
 245                 else
 246                         return -EOPNOTSUPP;
 247         }
 248
 249         if (ops->get_sset_count && ops->get_strings)
 250                 return ops->get_sset_count(dev, sset);
 251         else
 252                 return -EOPNOTSUPP;
 253 }
 254
 255 static void __ethtool_get_strings(struct net_device *dev,
 256         u32 stringset, u8 *data)
 257 {
 258         const struct ethtool_ops *ops = dev->ethtool_ops;
 259
 260         if (stringset == ETH_SS_FEATURES)
 261                 memcpy(data, netdev_features_strings,
 262                         sizeof(netdev_features_strings));
 263         else if (stringset == ETH_SS_RSS_HASH_FUNCS)
 264                 memcpy(data, rss_hash_func_strings,
 265                        sizeof(rss_hash_func_strings));
 266         else if (stringset == ETH_SS_TUNABLES)
 267                 memcpy(data, tunable_strings, sizeof(tunable_strings));
 268         else if (stringset == ETH_SS_PHY_TUNABLES)
 269                 memcpy(data, phy_tunable_strings, sizeof(phy_tunable_strings));
 270         else if (stringset == ETH_SS_PHY_STATS) {
 271                 struct phy_device *phydev = dev->phydev;
 272
 273                 if (phydev) {
 274                         mutex_lock(&phydev->lock);
 275                         phydev->drv->get_strings(phydev, data);
 276                         mutex_unlock(&phydev->lock);
 277                 } else {
 278                         return;
 279                 }
 280         } else
 281                 /* ops->get_strings is valid because checked earlier */
 282                 ops->get_strings(dev, stringset, data);
 283 }
 284
 285 static netdev_features_t ethtool_get_feature_mask(u32 eth_cmd)
 286 {
 287         /* feature masks of legacy discrete ethtool ops */
 288
 289         switch (eth_cmd) {
 290         case ETHTOOL_GTXCSUM:
 291         case ETHTOOL_STXCSUM:
 292                 return NETIF_F_CSUM_MASK | NETIF_F_SCTP_CRC;
 293         case ETHTOOL_GRXCSUM:
 294         case ETHTOOL_SRXCSUM:
 295                 return NETIF_F_RXCSUM;
 296         case ETHTOOL_GSG:
 297         case ETHTOOL_SSG:
 298                 return NETIF_F_SG;
 299         case ETHTOOL_GTSO:
 300         case ETHTOOL_STSO:
 301                 return NETIF_F_ALL_TSO;
 302         case ETHTOOL_GGSO:
 303         case ETHTOOL_SGSO:
 304                 return NETIF_F_GSO;
 305         case ETHTOOL_GGRO:
 306         case ETHTOOL_SGRO:
 307                 return NETIF_F_GRO;
 308         default:
 309                 BUG();
 310         }
 311 }
 312
 313 static int ethtool_get_one_feature(struct net_device *dev,
 314         char __user *useraddr, u32 ethcmd)
 315 {
 316         netdev_features_t mask = ethtool_get_feature_mask(ethcmd);
 317         struct ethtool_value edata = {
 318                 .cmd = ethcmd,
 319                 .data = !!(dev->features & mask),
 320         };
 321
 322         if (copy_to_user(useraddr, &edata, sizeof(edata)))
 323                 return -EFAULT;
 324         return 0;
 325 }
 326
 327 static int ethtool_set_one_feature(struct net_device *dev,
 328         void __user *useraddr, u32 ethcmd)
 329 {
 330         struct ethtool_value edata;
 331         netdev_features_t mask;
 332
 333         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 334                 return -EFAULT;
 335
 336         mask = ethtool_get_feature_mask(ethcmd);
 337         mask &= dev->hw_features;
 338         if (!mask)
 339                 return -EOPNOTSUPP;
 340
 341         if (edata.data)
 342                 dev->wanted_features |= mask;
 343         else
 344                 dev->wanted_features &= ~mask;
 345
 346         __netdev_update_features(dev);
 347
 348         return 0;
 349 }
 350
 351 #define ETH_ALL_FLAGS    (ETH_FLAG_LRO | ETH_FLAG_RXVLAN | ETH_FLAG_TXVLAN | \
 352                           ETH_FLAG_NTUPLE | ETH_FLAG_RXHASH)
 353 #define ETH_ALL_FEATURES (NETIF_F_LRO | NETIF_F_HW_VLAN_CTAG_RX | \
 354                           NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_NTUPLE | \
 355                           NETIF_F_RXHASH)
 356
 357 static u32 __ethtool_get_flags(struct net_device *dev)
 358 {
 359         u32 flags = 0;
 360
 361         if (dev->features & NETIF_F_LRO)
 362                 flags |= ETH_FLAG_LRO;
 363         if (dev->features & NETIF_F_HW_VLAN_CTAG_RX)
 364                 flags |= ETH_FLAG_RXVLAN;
 365         if (dev->features & NETIF_F_HW_VLAN_CTAG_TX)
 366                 flags |= ETH_FLAG_TXVLAN;
 367         if (dev->features & NETIF_F_NTUPLE)
 368                 flags |= ETH_FLAG_NTUPLE;
 369         if (dev->features & NETIF_F_RXHASH)
 370                 flags |= ETH_FLAG_RXHASH;
 371
 372         return flags;
 373 }
 374
 375 static int __ethtool_set_flags(struct net_device *dev, u32 data)
 376 {
 377         netdev_features_t features = 0, changed;
 378
 379         if (data & ~ETH_ALL_FLAGS)
 380                 return -EINVAL;
 381
 382         if (data & ETH_FLAG_LRO)
 383                 features |= NETIF_F_LRO;
 384         if (data & ETH_FLAG_RXVLAN)
 385                 features |= NETIF_F_HW_VLAN_CTAG_RX;
 386         if (data & ETH_FLAG_TXVLAN)
 387                 features |= NETIF_F_HW_VLAN_CTAG_TX;
 388         if (data & ETH_FLAG_NTUPLE)
 389                 features |= NETIF_F_NTUPLE;
 390         if (data & ETH_FLAG_RXHASH)
 391                 features |= NETIF_F_RXHASH;
 392
 393         /* allow changing only bits set in hw_features */
 394         changed = (features ^ dev->features) & ETH_ALL_FEATURES;
 395         if (changed & ~dev->hw_features)
 396                 return (changed & dev->hw_features) ? -EINVAL : -EOPNOTSUPP;
 397
 398         dev->wanted_features =
 399                 (dev->wanted_features & ~changed) | (features & changed);
 400
 401         __netdev_update_features(dev);
 402
 403         return 0;
 404 }
 405
 406 void ethtool_convert_legacy_u32_to_link_mode(unsigned long *dst,
 407                                              u32 legacy_u32)
 408 {
 409         bitmap_zero(dst, __ETHTOOL_LINK_MODE_MASK_NBITS);
 410         dst[0] = legacy_u32;
 411 }
 412 EXPORT_SYMBOL(ethtool_convert_legacy_u32_to_link_mode);
 413
 414 /* return false if src had higher bits set. lower bits always updated. */
 415 bool ethtool_convert_link_mode_to_legacy_u32(u32 *legacy_u32,
 416                                              const unsigned long *src)
 417 {
 418         bool retval = true;
 419
 420         /* TODO: following test will soon always be true */
 421         if (__ETHTOOL_LINK_MODE_MASK_NBITS > 32) {
 422                 __ETHTOOL_DECLARE_LINK_MODE_MASK(ext);
 423
 424                 bitmap_zero(ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
 425                 bitmap_fill(ext, 32);
 426                 bitmap_complement(ext, ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
 427                 if (bitmap_intersects(ext, src,
 428                                       __ETHTOOL_LINK_MODE_MASK_NBITS)) {
 429                         /* src mask goes beyond bit 31 */
 430                         retval = false;
 431                 }
 432         }
 433         *legacy_u32 = src[0];
 434         return retval;
 435 }
 436 EXPORT_SYMBOL(ethtool_convert_link_mode_to_legacy_u32);
 437
 438 /* return false if legacy contained non-0 deprecated fields
 439  * maxtxpkt/maxrxpkt. rest of ksettings always updated
 440  */
 441 static bool
 442 convert_legacy_settings_to_link_ksettings(
 443         struct ethtool_link_ksettings *link_ksettings,
 444         const struct ethtool_cmd *legacy_settings)
 445 {
 446         bool retval = true;
 447
 448         memset(link_ksettings, 0, sizeof(*link_ksettings));
 449
 450         /* This is used to tell users that driver is still using these
 451          * deprecated legacy fields, and they should not use
 452          * %ETHTOOL_GLINKSETTINGS/%ETHTOOL_SLINKSETTINGS
 453          */
 454         if (legacy_settings->maxtxpkt ||
 455             legacy_settings->maxrxpkt)
 456                 retval = false;
 457
 458         ethtool_convert_legacy_u32_to_link_mode(
 459                 link_ksettings->link_modes.supported,
 460                 legacy_settings->supported);
 461         ethtool_convert_legacy_u32_to_link_mode(
 462                 link_ksettings->link_modes.advertising,
 463                 legacy_settings->advertising);
 464         ethtool_convert_legacy_u32_to_link_mode(
 465                 link_ksettings->link_modes.lp_advertising,
 466                 legacy_settings->lp_advertising);
 467         link_ksettings->base.speed
 468                 = ethtool_cmd_speed(legacy_settings);
 469         link_ksettings->base.duplex
 470                 = legacy_settings->duplex;
 471         link_ksettings->base.port
 472                 = legacy_settings->port;
 473         link_ksettings->base.phy_address
 474                 = legacy_settings->phy_address;
 475         link_ksettings->base.autoneg
 476                 = legacy_settings->autoneg;
 477         link_ksettings->base.mdio_support
 478                 = legacy_settings->mdio_support;
 479         link_ksettings->base.eth_tp_mdix
 480                 = legacy_settings->eth_tp_mdix;
 481         link_ksettings->base.eth_tp_mdix_ctrl
 482                 = legacy_settings->eth_tp_mdix_ctrl;
 483         return retval;
 484 }
 485
 486 /* return false if ksettings link modes had higher bits
 487  * set. legacy_settings always updated (best effort)
 488  */
 489 static bool
 490 convert_link_ksettings_to_legacy_settings(
 491         struct ethtool_cmd *legacy_settings,
 492         const struct ethtool_link_ksettings *link_ksettings)
 493 {
 494         bool retval = true;
 495
 496         memset(legacy_settings, 0, sizeof(*legacy_settings));
 497         /* this also clears the deprecated fields in legacy structure:
 498          * __u8         transceiver;
 499          * __u32        maxtxpkt;
 500          * __u32        maxrxpkt;
 501          */
 502
 503         retval &= ethtool_convert_link_mode_to_legacy_u32(
 504                 &legacy_settings->supported,
 505                 link_ksettings->link_modes.supported);
 506         retval &= ethtool_convert_link_mode_to_legacy_u32(
 507                 &legacy_settings->advertising,
 508                 link_ksettings->link_modes.advertising);
 509         retval &= ethtool_convert_link_mode_to_legacy_u32(
 510                 &legacy_settings->lp_advertising,
 511                 link_ksettings->link_modes.lp_advertising);
 512         ethtool_cmd_speed_set(legacy_settings, link_ksettings->base.speed);
 513         legacy_settings->duplex
 514                 = link_ksettings->base.duplex;
 515         legacy_settings->port
 516                 = link_ksettings->base.port;
 517         legacy_settings->phy_address
 518                 = link_ksettings->base.phy_address;
 519         legacy_settings->autoneg
 520                 = link_ksettings->base.autoneg;
 521         legacy_settings->mdio_support
 522                 = link_ksettings->base.mdio_support;
 523         legacy_settings->eth_tp_mdix
 524                 = link_ksettings->base.eth_tp_mdix;
 525         legacy_settings->eth_tp_mdix_ctrl
 526                 = link_ksettings->base.eth_tp_mdix_ctrl;
 527         legacy_settings->transceiver
 528                 = link_ksettings->base.transceiver;
 529         return retval;
 530 }
 531
 532 /* number of 32-bit words to store the user's link mode bitmaps */
 533 #define __ETHTOOL_LINK_MODE_MASK_NU32                   \
 534         DIV_ROUND_UP(__ETHTOOL_LINK_MODE_MASK_NBITS, 32)
 535
 536 /* layout of the struct passed from/to userland */
 537 struct ethtool_link_usettings {
 538         struct ethtool_link_settings base;
 539         struct {
 540                 __u32 supported[__ETHTOOL_LINK_MODE_MASK_NU32];
 541                 __u32 advertising[__ETHTOOL_LINK_MODE_MASK_NU32];
 542                 __u32 lp_advertising[__ETHTOOL_LINK_MODE_MASK_NU32];
 543         } link_modes;
 544 };
 545
 546 /* Internal kernel helper to query a device ethtool_link_settings.
 547  *
 548  * Backward compatibility note: for compatibility with legacy drivers
 549  * that implement only the ethtool_cmd API, this has to work with both
 550  * drivers implementing get_link_ksettings API and drivers
 551  * implementing get_settings API. When drivers implement get_settings
 552  * and report ethtool_cmd deprecated fields
 553  * (transceiver/maxrxpkt/maxtxpkt), these fields are silently ignored
 554  * because the resulting struct ethtool_link_settings does not report them.
 555  */
 556 int __ethtool_get_link_ksettings(struct net_device *dev,
 557                                  struct ethtool_link_ksettings *link_ksettings)
 558 {
 559         int err;
 560         struct ethtool_cmd cmd;
 561
 562         ASSERT_RTNL();
 563
 564         if (dev->ethtool_ops->get_link_ksettings) {
 565                 memset(link_ksettings, 0, sizeof(*link_ksettings));
 566                 return dev->ethtool_ops->get_link_ksettings(dev,
 567                                                             link_ksettings);
 568         }
 569
 570         /* driver doesn't support %ethtool_link_ksettings API. revert to
 571          * legacy %ethtool_cmd API, unless it's not supported either.
 572          * TODO: remove when ethtool_ops::get_settings disappears internally
 573          */
 574         if (!dev->ethtool_ops->get_settings)
 575                 return -EOPNOTSUPP;
 576
 577         memset(&cmd, 0, sizeof(cmd));
 578         cmd.cmd = ETHTOOL_GSET;
 579         err = dev->ethtool_ops->get_settings(dev, &cmd);
 580         if (err < 0)
 581                 return err;
 582
 583         /* we ignore deprecated fields transceiver/maxrxpkt/maxtxpkt
 584          */
 585         convert_legacy_settings_to_link_ksettings(link_ksettings, &cmd);
 586         return err;
 587 }
 588 EXPORT_SYMBOL(__ethtool_get_link_ksettings);
 589
 590 /* convert ethtool_link_usettings in user space to a kernel internal
 591  * ethtool_link_ksettings. return 0 on success, errno on error.
 592  */
 593 static int load_link_ksettings_from_user(struct ethtool_link_ksettings *to,
 594                                          const void __user *from)
 595 {
 596         struct ethtool_link_usettings link_usettings;
 597
 598         if (copy_from_user(&link_usettings, from, sizeof(link_usettings)))
 599                 return -EFAULT;
 600
 601         memcpy(&to->base, &link_usettings.base, sizeof(to->base));
 602         bitmap_from_u32array(to->link_modes.supported,
 603                              __ETHTOOL_LINK_MODE_MASK_NBITS,
 604                              link_usettings.link_modes.supported,
 605                              __ETHTOOL_LINK_MODE_MASK_NU32);
 606         bitmap_from_u32array(to->link_modes.advertising,
 607                              __ETHTOOL_LINK_MODE_MASK_NBITS,
 608                              link_usettings.link_modes.advertising,
 609                              __ETHTOOL_LINK_MODE_MASK_NU32);
 610         bitmap_from_u32array(to->link_modes.lp_advertising,
 611                              __ETHTOOL_LINK_MODE_MASK_NBITS,
 612                              link_usettings.link_modes.lp_advertising,
 613                              __ETHTOOL_LINK_MODE_MASK_NU32);
 614
 615         return 0;
 616 }
 617
 618 /* convert a kernel internal ethtool_link_ksettings to
 619  * ethtool_link_usettings in user space. return 0 on success, errno on
 620  * error.
 621  */
 622 static int
 623 store_link_ksettings_for_user(void __user *to,
 624                               const struct ethtool_link_ksettings *from)
 625 {
 626         struct ethtool_link_usettings link_usettings;
 627
 628         memcpy(&link_usettings.base, &from->base, sizeof(link_usettings));
 629         bitmap_to_u32array(link_usettings.link_modes.supported,
 630                            __ETHTOOL_LINK_MODE_MASK_NU32,
 631                            from->link_modes.supported,
 632                            __ETHTOOL_LINK_MODE_MASK_NBITS);
 633         bitmap_to_u32array(link_usettings.link_modes.advertising,
 634                            __ETHTOOL_LINK_MODE_MASK_NU32,
 635                            from->link_modes.advertising,
 636                            __ETHTOOL_LINK_MODE_MASK_NBITS);
 637         bitmap_to_u32array(link_usettings.link_modes.lp_advertising,
 638                            __ETHTOOL_LINK_MODE_MASK_NU32,
 639                            from->link_modes.lp_advertising,
 640                            __ETHTOOL_LINK_MODE_MASK_NBITS);
 641
 642         if (copy_to_user(to, &link_usettings, sizeof(link_usettings)))
 643                 return -EFAULT;
 644
 645         return 0;
 646 }
 647
 648 /* Query device for its ethtool_link_settings.
 649  *
 650  * Backward compatibility note: this function must fail when driver
 651  * does not implement ethtool::get_link_ksettings, even if legacy
 652  * ethtool_ops::get_settings is implemented. This tells new versions
 653  * of ethtool that they should use the legacy API %ETHTOOL_GSET for
 654  * this driver, so that they can correctly access the ethtool_cmd
 655  * deprecated fields (transceiver/maxrxpkt/maxtxpkt), until no driver
 656  * implements ethtool_ops::get_settings anymore.
 657  */
 658 static int ethtool_get_link_ksettings(struct net_device *dev,
 659                                       void __user *useraddr)
 660 {
 661         int err = 0;
 662         struct ethtool_link_ksettings link_ksettings;
 663
 664         ASSERT_RTNL();
 665
 666         if (!dev->ethtool_ops->get_link_ksettings)
 667                 return -EOPNOTSUPP;
 668
 669         /* handle bitmap nbits handshake */
 670         if (copy_from_user(&link_ksettings.base, useraddr,
 671                            sizeof(link_ksettings.base)))
 672                 return -EFAULT;
 673
 674         if (__ETHTOOL_LINK_MODE_MASK_NU32
 675             != link_ksettings.base.link_mode_masks_nwords) {
 676                 /* wrong link mode nbits requested */
 677                 memset(&link_ksettings, 0, sizeof(link_ksettings));
 678                 link_ksettings.base.cmd = ETHTOOL_GLINKSETTINGS;
 679                 /* send back number of words required as negative val */
 680                 compiletime_assert(__ETHTOOL_LINK_MODE_MASK_NU32 <= S8_MAX,
 681                                    "need too many bits for link modes!");
 682                 link_ksettings.base.link_mode_masks_nwords
 683                         = -((s8)__ETHTOOL_LINK_MODE_MASK_NU32);
 684
 685                 /* copy the base fields back to user, not the link
 686                  * mode bitmaps
 687                  */
 688                 if (copy_to_user(useraddr, &link_ksettings.base,
 689                                  sizeof(link_ksettings.base)))
 690                         return -EFAULT;
 691
 692                 return 0;
 693         }
 694
 695         /* handshake successful: user/kernel agree on
 696          * link_mode_masks_nwords
 697          */
 698
 699         memset(&link_ksettings, 0, sizeof(link_ksettings));
 700         err = dev->ethtool_ops->get_link_ksettings(dev, &link_ksettings);
 701         if (err < 0)
 702                 return err;
 703
 704         /* make sure we tell the right values to user */
 705         link_ksettings.base.cmd = ETHTOOL_GLINKSETTINGS;
 706         link_ksettings.base.link_mode_masks_nwords
 707                 = __ETHTOOL_LINK_MODE_MASK_NU32;
 708
 709         return store_link_ksettings_for_user(useraddr, &link_ksettings);
 710 }
 711
 712 /* Update device ethtool_link_settings.
 713  *
 714  * Backward compatibility note: this function must fail when driver
 715  * does not implement ethtool::set_link_ksettings, even if legacy
 716  * ethtool_ops::set_settings is implemented. This tells new versions
 717  * of ethtool that they should use the legacy API %ETHTOOL_SSET for
 718  * this driver, so that they can correctly update the ethtool_cmd
 719  * deprecated fields (transceiver/maxrxpkt/maxtxpkt), until no driver
 720  * implements ethtool_ops::get_settings anymore.
 721  */
 722 static int ethtool_set_link_ksettings(struct net_device *dev,
 723                                       void __user *useraddr)
 724 {
 725         int err;
 726         struct ethtool_link_ksettings link_ksettings;
 727
 728         ASSERT_RTNL();
 729
 730         if (!dev->ethtool_ops->set_link_ksettings)
 731                 return -EOPNOTSUPP;
 732
 733         /* make sure nbits field has expected value */
 734         if (copy_from_user(&link_ksettings.base, useraddr,
 735                            sizeof(link_ksettings.base)))
 736                 return -EFAULT;
 737
 738         if (__ETHTOOL_LINK_MODE_MASK_NU32
 739             != link_ksettings.base.link_mode_masks_nwords)
 740                 return -EINVAL;
 741
 742         /* copy the whole structure, now that we know it has expected
 743          * format
 744          */
 745         err = load_link_ksettings_from_user(&link_ksettings, useraddr);
 746         if (err)
 747                 return err;
 748
 749         /* re-check nwords field, just in case */
 750         if (__ETHTOOL_LINK_MODE_MASK_NU32
 751             != link_ksettings.base.link_mode_masks_nwords)
 752                 return -EINVAL;
 753
 754         return dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings);
 755 }
 756
 757 static void
 758 warn_incomplete_ethtool_legacy_settings_conversion(const char *details)
 759 {
 760         char name[sizeof(current->comm)];
 761
 762         pr_info_once("warning: `%s' uses legacy ethtool link settings API, %s\n",
 763                      get_task_comm(name, current), details);
 764 }
 765
 766 /* Query device for its ethtool_cmd settings.
 767  *
 768  * Backward compatibility note: for compatibility with legacy ethtool,
 769  * this has to work with both drivers implementing get_link_ksettings
 770  * API and drivers implementing get_settings API. When drivers
 771  * implement get_link_ksettings and report higher link mode bits, a
 772  * kernel warning is logged once (with name of 1st driver/device) to
 773  * recommend user to upgrade ethtool, but the command is successful
 774  * (only the lower link mode bits reported back to user).
 775  */
 776 static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
 777 {
 778         struct ethtool_cmd cmd;
 779
 780         ASSERT_RTNL();
 781
 782         if (dev->ethtool_ops->get_link_ksettings) {
 783                 /* First, use link_ksettings API if it is supported */
 784                 int err;
 785                 struct ethtool_link_ksettings link_ksettings;
 786
 787                 memset(&link_ksettings, 0, sizeof(link_ksettings));
 788                 err = dev->ethtool_ops->get_link_ksettings(dev,
 789                                                            &link_ksettings);
 790                 if (err < 0)
 791                         return err;
 792                 if (!convert_link_ksettings_to_legacy_settings(&cmd,
 793                                                                &link_ksettings))
 794                         warn_incomplete_ethtool_legacy_settings_conversion(
 795                                 "link modes are only partially reported");
 796
 797                 /* send a sensible cmd tag back to user */
 798                 cmd.cmd = ETHTOOL_GSET;
 799         } else {
 800                 /* driver doesn't support %ethtool_link_ksettings
 801                  * API. revert to legacy %ethtool_cmd API, unless it's
 802                  * not supported either.
 803                  */
 804                 int err;
 805
 806                 if (!dev->ethtool_ops->get_settings)
 807                         return -EOPNOTSUPP;
 808
 809                 memset(&cmd, 0, sizeof(cmd));
 810                 cmd.cmd = ETHTOOL_GSET;
 811                 err = dev->ethtool_ops->get_settings(dev, &cmd);
 812                 if (err < 0)
 813                         return err;
 814         }
 815
 816         if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
 817                 return -EFAULT;
 818
 819         return 0;
 820 }
 821
 822 /* Update device link settings with given ethtool_cmd.
 823  *
 824  * Backward compatibility note: for compatibility with legacy ethtool,
 825  * this has to work with both drivers implementing set_link_ksettings
 826  * API and drivers implementing set_settings API. When drivers
 827  * implement set_link_ksettings and user's request updates deprecated
 828  * ethtool_cmd fields (transceiver/maxrxpkt/maxtxpkt), a kernel
 829  * warning is logged once (with name of 1st driver/device) to
 830  * recommend user to upgrade ethtool, and the request is rejected.
 831  */
 832 static int ethtool_set_settings(struct net_device *dev, void __user *useraddr)
 833 {
 834         struct ethtool_cmd cmd;
 835
 836         ASSERT_RTNL();
 837
 838         if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
 839                 return -EFAULT;
 840
 841         /* first, try new %ethtool_link_ksettings API. */
 842         if (dev->ethtool_ops->set_link_ksettings) {
 843                 struct ethtool_link_ksettings link_ksettings;
 844
 845                 if (!convert_legacy_settings_to_link_ksettings(&link_ksettings,
 846                                                                &cmd))
 847                         return -EINVAL;
 848
 849                 link_ksettings.base.cmd = ETHTOOL_SLINKSETTINGS;
 850                 link_ksettings.base.link_mode_masks_nwords
 851                         = __ETHTOOL_LINK_MODE_MASK_NU32;
 852                 return dev->ethtool_ops->set_link_ksettings(dev,
 853                                                             &link_ksettings);
 854         }
 855
 856         /* legacy %ethtool_cmd API */
 857
 858         /* TODO: return -EOPNOTSUPP when ethtool_ops::get_settings
 859          * disappears internally
 860          */
 861
 862         if (!dev->ethtool_ops->set_settings)
 863                 return -EOPNOTSUPP;
 864
 865         return dev->ethtool_ops->set_settings(dev, &cmd);
 866 }
 867
 868 static noinline_for_stack int ethtool_get_drvinfo(struct net_device *dev,
 869                                                   void __user *useraddr)
 870 {
 871         struct ethtool_drvinfo info;
 872         const struct ethtool_ops *ops = dev->ethtool_ops;
 873
 874         memset(&info, 0, sizeof(info));
 875         info.cmd = ETHTOOL_GDRVINFO;
 876         if (ops->get_drvinfo) {
 877                 ops->get_drvinfo(dev, &info);
 878         } else if (dev->dev.parent && dev->dev.parent->driver) {
 879                 strlcpy(info.bus_info, dev_name(dev->dev.parent),
 880                         sizeof(info.bus_info));
 881                 strlcpy(info.driver, dev->dev.parent->driver->name,
 882                         sizeof(info.driver));
 883         } else {
 884                 return -EOPNOTSUPP;
 885         }
 886
 887         /*
 888          * this method of obtaining string set info is deprecated;
 889          * Use ETHTOOL_GSSET_INFO instead.
 890          */
 891         if (ops->get_sset_count) {
 892                 int rc;
 893
 894                 rc = ops->get_sset_count(dev, ETH_SS_TEST);
 895                 if (rc >= 0)
 896                         info.testinfo_len = rc;
 897                 rc = ops->get_sset_count(dev, ETH_SS_STATS);
 898                 if (rc >= 0)
 899                         info.n_stats = rc;
 900                 rc = ops->get_sset_count(dev, ETH_SS_PRIV_FLAGS);
 901                 if (rc >= 0)
 902                         info.n_priv_flags = rc;
 903         }
 904         if (ops->get_regs_len)
 905                 info.regdump_len = ops->get_regs_len(dev);
 906         if (ops->get_eeprom_len)
 907                 info.eedump_len = ops->get_eeprom_len(dev);
 908
 909         if (copy_to_user(useraddr, &info, sizeof(info)))
 910                 return -EFAULT;
 911         return 0;
 912 }
 913
 914 static noinline_for_stack int ethtool_get_sset_info(struct net_device *dev,
 915                                                     void __user *useraddr)
 916 {
 917         struct ethtool_sset_info info;
 918         u64 sset_mask;
 919         int i, idx = 0, n_bits = 0, ret, rc;
 920         u32 *info_buf = NULL;
 921
 922         if (copy_from_user(&info, useraddr, sizeof(info)))
 923                 return -EFAULT;
 924
 925         /* store copy of mask, because we zero struct later on */
 926         sset_mask = info.sset_mask;
 927         if (!sset_mask)
 928                 return 0;
 929
 930         /* calculate size of return buffer */
 931         n_bits = hweight64(sset_mask);
 932
 933         memset(&info, 0, sizeof(info));
 934         info.cmd = ETHTOOL_GSSET_INFO;
 935
 936         info_buf = kzalloc(n_bits * sizeof(u32), GFP_USER);
 937         if (!info_buf)
 938                 return -ENOMEM;
 939
 940         /*
 941          * fill return buffer based on input bitmask and successful
 942          * get_sset_count return
 943          */
 944         for (i = 0; i < 64; i++) {
 945                 if (!(sset_mask & (1ULL << i)))
 946                         continue;
 947
 948                 rc = __ethtool_get_sset_count(dev, i);
 949                 if (rc >= 0) {
 950                         info.sset_mask |= (1ULL << i);
 951                         info_buf[idx++] = rc;
 952                 }
 953         }
 954
 955         ret = -EFAULT;
 956         if (copy_to_user(useraddr, &info, sizeof(info)))
 957                 goto out;
 958
 959         useraddr += offsetof(struct ethtool_sset_info, data);
 960         if (copy_to_user(useraddr, info_buf, idx * sizeof(u32)))
 961                 goto out;
 962
 963         ret = 0;
 964
 965 out:
 966         kfree(info_buf);
 967         return ret;
 968 }
 969
 970 static noinline_for_stack int ethtool_set_rxnfc(struct net_device *dev,
 971                                                 u32 cmd, void __user *useraddr)
 972 {
 973         struct ethtool_rxnfc info;
 974         size_t info_size = sizeof(info);
 975         int rc;
 976
 977         if (!dev->ethtool_ops->set_rxnfc)
 978                 return -EOPNOTSUPP;
 979
 980         /* struct ethtool_rxnfc was originally defined for
 981          * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
 982          * members.  User-space might still be using that
 983          * definition. */
 984         if (cmd == ETHTOOL_SRXFH)
 985                 info_size = (offsetof(struct ethtool_rxnfc, data) +
 986                              sizeof(info.data));
 987
 988         if (copy_from_user(&info, useraddr, info_size))
 989                 return -EFAULT;
 990
 991         rc = dev->ethtool_ops->set_rxnfc(dev, &info);
 992         if (rc)
 993                 return rc;
 994
 995         if (cmd == ETHTOOL_SRXCLSRLINS &&
 996             copy_to_user(useraddr, &info, info_size))
 997                 return -EFAULT;
 998
 999         return 0;
1000 }
1001
1002 static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,
1003                                                 u32 cmd, void __user *useraddr)
1004 {
1005         struct ethtool_rxnfc info;
1006         size_t info_size = sizeof(info);
1007         const struct ethtool_ops *ops = dev->ethtool_ops;
1008         int ret;
1009         void *rule_buf = NULL;
1010
1011         if (!ops->get_rxnfc)
1012                 return -EOPNOTSUPP;
1013
1014         /* struct ethtool_rxnfc was originally defined for
1015          * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
1016          * members.  User-space might still be using that
1017          * definition. */
1018         if (cmd == ETHTOOL_GRXFH)
1019                 info_size = (offsetof(struct ethtool_rxnfc, data) +
1020                              sizeof(info.data));
1021
1022         if (copy_from_user(&info, useraddr, info_size))
1023                 return -EFAULT;
1024
1025         if (info.cmd == ETHTOOL_GRXCLSRLALL) {
1026                 if (info.rule_cnt > 0) {
1027                         if (info.rule_cnt <= KMALLOC_MAX_SIZE / sizeof(u32))
1028                                 rule_buf = kzalloc(info.rule_cnt * sizeof(u32),
1029                                                    GFP_USER);
1030                         if (!rule_buf)
1031                                 return -ENOMEM;
1032                 }
1033         }
1034
1035         ret = ops->get_rxnfc(dev, &info, rule_buf);
1036         if (ret < 0)
1037                 goto err_out;
1038
1039         ret = -EFAULT;
1040         if (copy_to_user(useraddr, &info, info_size))
1041                 goto err_out;
1042
1043         if (rule_buf) {
1044                 useraddr += offsetof(struct ethtool_rxnfc, rule_locs);
1045                 if (copy_to_user(useraddr, rule_buf,
1046                                  info.rule_cnt * sizeof(u32)))
1047                         goto err_out;
1048         }
1049         ret = 0;
1050
1051 err_out:
1052         kfree(rule_buf);
1053
1054         return ret;
1055 }
1056
1057 static int ethtool_copy_validate_indir(u32 *indir, void __user *useraddr,
1058                                         struct ethtool_rxnfc *rx_rings,
1059                                         u32 size)
1060 {
1061         int i;
1062
1063         if (copy_from_user(indir, useraddr, size * sizeof(indir[0])))
1064                 return -EFAULT;
1065
1066         /* Validate ring indices */
1067         for (i = 0; i < size; i++)
1068                 if (indir[i] >= rx_rings->data)
1069                         return -EINVAL;
1070
1071         return 0;
1072 }
1073
1074 u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly;
1075
1076 void netdev_rss_key_fill(void *buffer, size_t len)
1077 {
1078         BUG_ON(len > sizeof(netdev_rss_key));
1079         net_get_random_once(netdev_rss_key, sizeof(netdev_rss_key));
1080         memcpy(buffer, netdev_rss_key, len);
1081 }
1082 EXPORT_SYMBOL(netdev_rss_key_fill);
1083
1084 static int ethtool_get_max_rxfh_channel(struct net_device *dev, u32 *max)
1085 {
1086         u32 dev_size, current_max = 0;
1087         u32 *indir;
1088         int ret;
1089
1090         if (!dev->ethtool_ops->get_rxfh_indir_size ||
1091             !dev->ethtool_ops->get_rxfh)
1092                 return -EOPNOTSUPP;
1093         dev_size = dev->ethtool_ops->get_rxfh_indir_size(dev);
1094         if (dev_size == 0)
1095                 return -EOPNOTSUPP;
1096
1097         indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
1098         if (!indir)
1099                 return -ENOMEM;
1100
1101         ret = dev->ethtool_ops->get_rxfh(dev, indir, NULL, NULL);
1102         if (ret)
1103                 goto out;
1104
1105         while (dev_size--)
1106                 current_max = max(current_max, indir[dev_size]);
1107
1108         *max = current_max;
1109
1110 out:
1111         kfree(indir);
1112         return ret;
1113 }
1114
1115 static noinline_for_stack int ethtool_get_rxfh_indir(struct net_device *dev,
1116                                                      void __user *useraddr)
1117 {
1118         u32 user_size, dev_size;
1119         u32 *indir;
1120         int ret;
1121
1122         if (!dev->ethtool_ops->get_rxfh_indir_size ||
1123             !dev->ethtool_ops->get_rxfh)
1124                 return -EOPNOTSUPP;
1125         dev_size = dev->ethtool_ops->get_rxfh_indir_size(dev);
1126         if (dev_size == 0)
1127                 return -EOPNOTSUPP;
1128
1129         if (copy_from_user(&user_size,
1130                            useraddr + offsetof(struct ethtool_rxfh_indir, size),
1131                            sizeof(user_size)))
1132                 return -EFAULT;
1133
1134         if (copy_to_user(useraddr + offsetof(struct ethtool_rxfh_indir, size),
1135                          &dev_size, sizeof(dev_size)))
1136                 return -EFAULT;
1137
1138         /* If the user buffer size is 0, this is just a query for the
1139          * device table size.  Otherwise, if it's smaller than the
1140          * device table size it's an error.
1141          */
1142         if (user_size < dev_size)
1143                 return user_size == 0 ? 0 : -EINVAL;
1144
1145         indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
1146         if (!indir)
1147                 return -ENOMEM;
1148
1149         ret = dev->ethtool_ops->get_rxfh(dev, indir, NULL, NULL);
1150         if (ret)
1151                 goto out;
1152
1153         if (copy_to_user(useraddr +
1154                          offsetof(struct ethtool_rxfh_indir, ring_index[0]),
1155                          indir, dev_size * sizeof(indir[0])))
1156                 ret = -EFAULT;
1157
1158 out:
1159         kfree(indir);
1160         return ret;
1161 }
1162
1163 static noinline_for_stack int ethtool_set_rxfh_indir(struct net_device *dev,
1164                                                      void __user *useraddr)
1165 {
1166         struct ethtool_rxnfc rx_rings;
1167         u32 user_size, dev_size, i;
1168         u32 *indir;
1169         const struct ethtool_ops *ops = dev->ethtool_ops;
1170         int ret;
1171         u32 ringidx_offset = offsetof(struct ethtool_rxfh_indir, ring_index[0]);
1172
1173         if (!ops->get_rxfh_indir_size || !ops->set_rxfh ||
1174             !ops->get_rxnfc)
1175                 return -EOPNOTSUPP;
1176
1177         dev_size = ops->get_rxfh_indir_size(dev);
1178         if (dev_size == 0)
1179                 return -EOPNOTSUPP;
1180
1181         if (copy_from_user(&user_size,
1182                            useraddr + offsetof(struct ethtool_rxfh_indir, size),
1183                            sizeof(user_size)))
1184                 return -EFAULT;
1185
1186         if (user_size != 0 && user_size != dev_size)
1187                 return -EINVAL;
1188
1189         indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
1190         if (!indir)
1191                 return -ENOMEM;
1192
1193         rx_rings.cmd = ETHTOOL_GRXRINGS;
1194         ret = ops->get_rxnfc(dev, &rx_rings, NULL);
1195         if (ret)
1196                 goto out;
1197
1198         if (user_size == 0) {
1199                 for (i = 0; i < dev_size; i++)
1200                         indir[i] = ethtool_rxfh_indir_default(i, rx_rings.data);
1201         } else {
1202                 ret = ethtool_copy_validate_indir(indir,
1203                                                   useraddr + ringidx_offset,
1204                                                   &rx_rings,
1205                                                   dev_size);
1206                 if (ret)
1207                         goto out;
1208         }
1209
1210         ret = ops->set_rxfh(dev, indir, NULL, ETH_RSS_HASH_NO_CHANGE);
1211         if (ret)
1212                 goto out;
1213
1214         /* indicate whether rxfh was set to default */
1215         if (user_size == 0)
1216                 dev->priv_flags &= ~IFF_RXFH_CONFIGURED;
1217         else
1218                 dev->priv_flags |= IFF_RXFH_CONFIGURED;
1219
1220 out:
1221         kfree(indir);
1222         return ret;
1223 }
1224
1225 static noinline_for_stack int ethtool_get_rxfh(struct net_device *dev,
1226                                                void __user *useraddr)
1227 {
1228         int ret;
1229         const struct ethtool_ops *ops = dev->ethtool_ops;
1230         u32 user_indir_size, user_key_size;
1231         u32 dev_indir_size = 0, dev_key_size = 0;
1232         struct ethtool_rxfh rxfh;
1233         u32 total_size;
1234         u32 indir_bytes;
1235         u32 *indir = NULL;
1236         u8 dev_hfunc = 0;
1237         u8 *hkey = NULL;
1238         u8 *rss_config;
1239
1240         if (!ops->get_rxfh)
1241                 return -EOPNOTSUPP;
1242
1243         if (ops->get_rxfh_indir_size)
1244                 dev_indir_size = ops->get_rxfh_indir_size(dev);
1245         if (ops->get_rxfh_key_size)
1246                 dev_key_size = ops->get_rxfh_key_size(dev);
1247
1248         if (copy_from_user(&rxfh, useraddr, sizeof(rxfh)))
1249                 return -EFAULT;
1250         user_indir_size = rxfh.indir_size;
1251         user_key_size = rxfh.key_size;
1252
1253         /* Check that reserved fields are 0 for now */
1254         if (rxfh.rss_context || rxfh.rsvd8[0] || rxfh.rsvd8[1] ||
1255             rxfh.rsvd8[2] || rxfh.rsvd32)
1256                 return -EINVAL;
1257
1258         rxfh.indir_size = dev_indir_size;
1259         rxfh.key_size = dev_key_size;
1260         if (copy_to_user(useraddr, &rxfh, sizeof(rxfh)))
1261                 return -EFAULT;
1262
1263         if ((user_indir_size && (user_indir_size != dev_indir_size)) ||
1264             (user_key_size && (user_key_size != dev_key_size)))
1265                 return -EINVAL;
1266
1267         indir_bytes = user_indir_size * sizeof(indir[0]);
1268         total_size = indir_bytes + user_key_size;
1269         rss_config = kzalloc(total_size, GFP_USER);
1270         if (!rss_config)
1271                 return -ENOMEM;
1272
1273         if (user_indir_size)
1274                 indir = (u32 *)rss_config;
1275
1276         if (user_key_size)
1277                 hkey = rss_config + indir_bytes;
1278
1279         ret = dev->ethtool_ops->get_rxfh(dev, indir, hkey, &dev_hfunc);
1280         if (ret)
1281                 goto out;
1282
1283         if (copy_to_user(useraddr + offsetof(struct ethtool_rxfh, hfunc),
1284                          &dev_hfunc, sizeof(rxfh.hfunc))) {
1285                 ret = -EFAULT;
1286         } else if (copy_to_user(useraddr +
1287                               offsetof(struct ethtool_rxfh, rss_config[0]),
1288                               rss_config, total_size)) {
1289                 ret = -EFAULT;
1290         }
1291 out:
1292         kfree(rss_config);
1293
1294         return ret;
1295 }
1296
1297 static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
1298                                                void __user *useraddr)
1299 {
1300         int ret;
1301         const struct ethtool_ops *ops = dev->ethtool_ops;
1302         struct ethtool_rxnfc rx_rings;
1303         struct ethtool_rxfh rxfh;
1304         u32 dev_indir_size = 0, dev_key_size = 0, i;
1305         u32 *indir = NULL, indir_bytes = 0;
1306         u8 *hkey = NULL;
1307         u8 *rss_config;
1308         u32 rss_cfg_offset = offsetof(struct ethtool_rxfh, rss_config[0]);
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.rss_context || rxfh.rsvd8[0] || rxfh.rsvd8[1] ||
1323             rxfh.rsvd8[2] || rxfh.rsvd32)
1324                 return -EINVAL;
1325
1326         /* If either indir, hash key or function is valid, proceed further.
1327          * Must request at least one change: indir size, hash key or function.
1328          */
1329         if ((rxfh.indir_size &&
1330              rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE &&
1331              rxfh.indir_size != dev_indir_size) ||
1332             (rxfh.key_size && (rxfh.key_size != dev_key_size)) ||
1333             (rxfh.indir_size == ETH_RXFH_INDIR_NO_CHANGE &&
1334              rxfh.key_size == 0 && rxfh.hfunc == ETH_RSS_HASH_NO_CHANGE))
1335                 return -EINVAL;
1336
1337         if (rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE)
1338                 indir_bytes = dev_indir_size * sizeof(indir[0]);
1339
1340         rss_config = kzalloc(indir_bytes + rxfh.key_size, GFP_USER);
1341         if (!rss_config)
1342                 return -ENOMEM;
1343
1344         rx_rings.cmd = ETHTOOL_GRXRINGS;
1345         ret = ops->get_rxnfc(dev, &rx_rings, NULL);
1346         if (ret)
1347                 goto out;
1348
1349         /* rxfh.indir_size == 0 means reset the indir table to default.
1350          * rxfh.indir_size == ETH_RXFH_INDIR_NO_CHANGE means leave it unchanged.
1351          */
1352         if (rxfh.indir_size &&
1353             rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE) {
1354                 indir = (u32 *)rss_config;
1355                 ret = ethtool_copy_validate_indir(indir,
1356                                                   useraddr + rss_cfg_offset,
1357                                                   &rx_rings,
1358                                                   rxfh.indir_size);
1359                 if (ret)
1360                         goto out;
1361         } else if (rxfh.indir_size == 0) {
1362                 indir = (u32 *)rss_config;
1363                 for (i = 0; i < dev_indir_size; i++)
1364                         indir[i] = ethtool_rxfh_indir_default(i, rx_rings.data);
1365         }
1366
1367         if (rxfh.key_size) {
1368                 hkey = rss_config + indir_bytes;
1369                 if (copy_from_user(hkey,
1370                                    useraddr + rss_cfg_offset + indir_bytes,
1371                                    rxfh.key_size)) {
1372                         ret = -EFAULT;
1373                         goto out;
1374                 }
1375         }
1376
1377         ret = ops->set_rxfh(dev, indir, hkey, rxfh.hfunc);
1378         if (ret)
1379                 goto out;
1380
1381         /* indicate whether rxfh was set to default */
1382         if (rxfh.indir_size == 0)
1383                 dev->priv_flags &= ~IFF_RXFH_CONFIGURED;
1384         else if (rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE)
1385                 dev->priv_flags |= IFF_RXFH_CONFIGURED;
1386
1387 out:
1388         kfree(rss_config);
1389         return ret;
1390 }
1391
1392 static int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
1393 {
1394         struct ethtool_regs regs;
1395         const struct ethtool_ops *ops = dev->ethtool_ops;
1396         void *regbuf;
1397         int reglen, ret;
1398
1399         if (!ops->get_regs || !ops->get_regs_len)
1400                 return -EOPNOTSUPP;
1401
1402         if (copy_from_user(&regs, useraddr, sizeof(regs)))
1403                 return -EFAULT;
1404
1405         reglen = ops->get_regs_len(dev);
1406         if (regs.len > reglen)
1407                 regs.len = reglen;
1408
1409         regbuf = NULL;
1410         if (reglen) {
1411                 regbuf = vzalloc(reglen);
1412                 if (!regbuf)
1413                         return -ENOMEM;
1414         }
1415
1416         ops->get_regs(dev, &regs, regbuf);
1417
1418         ret = -EFAULT;
1419         if (copy_to_user(useraddr, &regs, sizeof(regs)))
1420                 goto out;
1421         useraddr += offsetof(struct ethtool_regs, data);
1422         if (regbuf && copy_to_user(useraddr, regbuf, regs.len))
1423                 goto out;
1424         ret = 0;
1425
1426  out:
1427         vfree(regbuf);
1428         return ret;
1429 }
1430
1431 static int ethtool_reset(struct net_device *dev, char __user *useraddr)
1432 {
1433         struct ethtool_value reset;
1434         int ret;
1435
1436         if (!dev->ethtool_ops->reset)
1437                 return -EOPNOTSUPP;
1438
1439         if (copy_from_user(&reset, useraddr, sizeof(reset)))
1440                 return -EFAULT;
1441
1442         ret = dev->ethtool_ops->reset(dev, &reset.data);
1443         if (ret)
1444                 return ret;
1445
1446         if (copy_to_user(useraddr, &reset, sizeof(reset)))
1447                 return -EFAULT;
1448         return 0;
1449 }
1450
1451 static int ethtool_get_wol(struct net_device *dev, char __user *useraddr)
1452 {
1453         struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
1454
1455         if (!dev->ethtool_ops->get_wol)
1456                 return -EOPNOTSUPP;
1457
1458         dev->ethtool_ops->get_wol(dev, &wol);
1459
1460         if (copy_to_user(useraddr, &wol, sizeof(wol)))
1461                 return -EFAULT;
1462         return 0;
1463 }
1464
1465 static int ethtool_set_wol(struct net_device *dev, char __user *useraddr)
1466 {
1467         struct ethtool_wolinfo wol;
1468
1469         if (!dev->ethtool_ops->set_wol)
1470                 return -EOPNOTSUPP;
1471
1472         if (copy_from_user(&wol, useraddr, sizeof(wol)))
1473                 return -EFAULT;
1474
1475         return dev->ethtool_ops->set_wol(dev, &wol);
1476 }
1477
1478 static int ethtool_get_eee(struct net_device *dev, char __user *useraddr)
1479 {
1480         struct ethtool_eee edata;
1481         int rc;
1482
1483         if (!dev->ethtool_ops->get_eee)
1484                 return -EOPNOTSUPP;
1485
1486         memset(&edata, 0, sizeof(struct ethtool_eee));
1487         edata.cmd = ETHTOOL_GEEE;
1488         rc = dev->ethtool_ops->get_eee(dev, &edata);
1489
1490         if (rc)
1491                 return rc;
1492
1493         if (copy_to_user(useraddr, &edata, sizeof(edata)))
1494                 return -EFAULT;
1495
1496         return 0;
1497 }
1498
1499 static int ethtool_set_eee(struct net_device *dev, char __user *useraddr)
1500 {
1501         struct ethtool_eee edata;
1502
1503         if (!dev->ethtool_ops->set_eee)
1504                 return -EOPNOTSUPP;
1505
1506         if (copy_from_user(&edata, useraddr, sizeof(edata)))
1507                 return -EFAULT;
1508
1509         return dev->ethtool_ops->set_eee(dev, &edata);
1510 }
1511
1512 static int ethtool_nway_reset(struct net_device *dev)
1513 {
1514         if (!dev->ethtool_ops->nway_reset)
1515                 return -EOPNOTSUPP;
1516
1517         return dev->ethtool_ops->nway_reset(dev);
1518 }
1519
1520 static int ethtool_get_link(struct net_device *dev, char __user *useraddr)
1521 {
1522         struct ethtool_value edata = { .cmd = ETHTOOL_GLINK };
1523
1524         if (!dev->ethtool_ops->get_link)
1525                 return -EOPNOTSUPP;
1526
1527         edata.data = netif_running(dev) && dev->ethtool_ops->get_link(dev);
1528
1529         if (copy_to_user(useraddr, &edata, sizeof(edata)))
1530                 return -EFAULT;
1531         return 0;
1532 }
1533
1534 static int ethtool_get_any_eeprom(struct net_device *dev, void __user *useraddr,
1535                                   int (*getter)(struct net_device *,
1536                                                 struct ethtool_eeprom *, u8 *),
1537                                   u32 total_len)
1538 {
1539         struct ethtool_eeprom eeprom;
1540         void __user *userbuf = useraddr + sizeof(eeprom);
1541         u32 bytes_remaining;
1542         u8 *data;
1543         int ret = 0;
1544
1545         if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
1546                 return -EFAULT;
1547
1548         /* Check for wrap and zero */
1549         if (eeprom.offset + eeprom.len <= eeprom.offset)
1550                 return -EINVAL;
1551
1552         /* Check for exceeding total eeprom len */
1553         if (eeprom.offset + eeprom.len > total_len)
1554                 return -EINVAL;
1555
1556         data = kmalloc(PAGE_SIZE, GFP_USER);
1557         if (!data)
1558                 return -ENOMEM;
1559
1560         bytes_remaining = eeprom.len;
1561         while (bytes_remaining > 0) {
1562                 eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);
1563
1564                 ret = getter(dev, &eeprom, data);
1565                 if (ret)
1566                         break;
1567                 if (copy_to_user(userbuf, data, eeprom.len)) {
1568                         ret = -EFAULT;
1569                         break;
1570                 }
1571                 userbuf += eeprom.len;
1572                 eeprom.offset += eeprom.len;
1573                 bytes_remaining -= eeprom.len;
1574         }
1575
1576         eeprom.len = userbuf - (useraddr + sizeof(eeprom));
1577         eeprom.offset -= eeprom.len;
1578         if (copy_to_user(useraddr, &eeprom, sizeof(eeprom)))
1579                 ret = -EFAULT;
1580
1581         kfree(data);
1582         return ret;
1583 }
1584
1585 static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
1586 {
1587         const struct ethtool_ops *ops = dev->ethtool_ops;
1588
1589         if (!ops->get_eeprom || !ops->get_eeprom_len ||
1590             !ops->get_eeprom_len(dev))
1591                 return -EOPNOTSUPP;
1592
1593         return ethtool_get_any_eeprom(dev, useraddr, ops->get_eeprom,
1594                                       ops->get_eeprom_len(dev));
1595 }
1596
1597 static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
1598 {
1599         struct ethtool_eeprom eeprom;
1600         const struct ethtool_ops *ops = dev->ethtool_ops;
1601         void __user *userbuf = useraddr + sizeof(eeprom);
1602         u32 bytes_remaining;
1603         u8 *data;
1604         int ret = 0;
1605
1606         if (!ops->set_eeprom || !ops->get_eeprom_len ||
1607             !ops->get_eeprom_len(dev))
1608                 return -EOPNOTSUPP;
1609
1610         if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
1611                 return -EFAULT;
1612
1613         /* Check for wrap and zero */
1614         if (eeprom.offset + eeprom.len <= eeprom.offset)
1615                 return -EINVAL;
1616
1617         /* Check for exceeding total eeprom len */
1618         if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
1619                 return -EINVAL;
1620
1621         data = kmalloc(PAGE_SIZE, GFP_USER);
1622         if (!data)
1623                 return -ENOMEM;
1624
1625         bytes_remaining = eeprom.len;
1626         while (bytes_remaining > 0) {
1627                 eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);
1628
1629                 if (copy_from_user(data, userbuf, eeprom.len)) {
1630                         ret = -EFAULT;
1631                         break;
1632                 }
1633                 ret = ops->set_eeprom(dev, &eeprom, data);
1634                 if (ret)
1635                         break;
1636                 userbuf += eeprom.len;
1637                 eeprom.offset += eeprom.len;
1638                 bytes_remaining -= eeprom.len;
1639         }
1640
1641         kfree(data);
1642         return ret;
1643 }
1644
1645 static noinline_for_stack int ethtool_get_coalesce(struct net_device *dev,
1646                                                    void __user *useraddr)
1647 {
1648         struct ethtool_coalesce coalesce = { .cmd = ETHTOOL_GCOALESCE };
1649
1650         if (!dev->ethtool_ops->get_coalesce)
1651                 return -EOPNOTSUPP;
1652
1653         dev->ethtool_ops->get_coalesce(dev, &coalesce);
1654
1655         if (copy_to_user(useraddr, &coalesce, sizeof(coalesce)))
1656                 return -EFAULT;
1657         return 0;
1658 }
1659
1660 static noinline_for_stack int ethtool_set_coalesce(struct net_device *dev,
1661                                                    void __user *useraddr)
1662 {
1663         struct ethtool_coalesce coalesce;
1664
1665         if (!dev->ethtool_ops->set_coalesce)
1666                 return -EOPNOTSUPP;
1667
1668         if (copy_from_user(&coalesce, useraddr, sizeof(coalesce)))
1669                 return -EFAULT;
1670
1671         return dev->ethtool_ops->set_coalesce(dev, &coalesce);
1672 }
1673
1674 static int ethtool_get_ringparam(struct net_device *dev, void __user *useraddr)
1675 {
1676         struct ethtool_ringparam ringparam = { .cmd = ETHTOOL_GRINGPARAM };
1677
1678         if (!dev->ethtool_ops->get_ringparam)
1679                 return -EOPNOTSUPP;
1680
1681         dev->ethtool_ops->get_ringparam(dev, &ringparam);
1682
1683         if (copy_to_user(useraddr, &ringparam, sizeof(ringparam)))
1684                 return -EFAULT;
1685         return 0;
1686 }
1687
1688 static int ethtool_set_ringparam(struct net_device *dev, void __user *useraddr)
1689 {
1690         struct ethtool_ringparam ringparam;
1691
1692         if (!dev->ethtool_ops->set_ringparam)
1693                 return -EOPNOTSUPP;
1694
1695         if (copy_from_user(&ringparam, useraddr, sizeof(ringparam)))
1696                 return -EFAULT;
1697
1698         return dev->ethtool_ops->set_ringparam(dev, &ringparam);
1699 }
1700
1701 static noinline_for_stack int ethtool_get_channels(struct net_device *dev,
1702                                                    void __user *useraddr)
1703 {
1704         struct ethtool_channels channels = { .cmd = ETHTOOL_GCHANNELS };
1705
1706         if (!dev->ethtool_ops->get_channels)
1707                 return -EOPNOTSUPP;
1708
1709         dev->ethtool_ops->get_channels(dev, &channels);
1710
1711         if (copy_to_user(useraddr, &channels, sizeof(channels)))
1712                 return -EFAULT;
1713         return 0;
1714 }
1715
1716 static noinline_for_stack int ethtool_set_channels(struct net_device *dev,
1717                                                    void __user *useraddr)
1718 {
1719         struct ethtool_channels channels, max = { .cmd = ETHTOOL_GCHANNELS };
1720         u32 max_rx_in_use = 0;
1721
1722         if (!dev->ethtool_ops->set_channels || !dev->ethtool_ops->get_channels)
1723                 return -EOPNOTSUPP;
1724
1725         if (copy_from_user(&channels, useraddr, sizeof(channels)))
1726                 return -EFAULT;
1727
1728         dev->ethtool_ops->get_channels(dev, &max);
1729
1730         /* ensure new counts are within the maximums */
1731         if ((channels.rx_count > max.max_rx) ||
1732             (channels.tx_count > max.max_tx) ||
1733             (channels.combined_count > max.max_combined) ||
1734             (channels.other_count > max.max_other))
1735                 return -EINVAL;
1736
1737         /* ensure the new Rx count fits within the configured Rx flow
1738          * indirection table settings */
1739         if (netif_is_rxfh_configured(dev) &&
1740             !ethtool_get_max_rxfh_channel(dev, &max_rx_in_use) &&
1741             (channels.combined_count + channels.rx_count) <= max_rx_in_use)
1742             return -EINVAL;
1743
1744         return dev->ethtool_ops->set_channels(dev, &channels);
1745 }
1746
1747 static int ethtool_get_pauseparam(struct net_device *dev, void __user *useraddr)
1748 {
1749         struct ethtool_pauseparam pauseparam = { ETHTOOL_GPAUSEPARAM };
1750
1751         if (!dev->ethtool_ops->get_pauseparam)
1752                 return -EOPNOTSUPP;
1753
1754         dev->ethtool_ops->get_pauseparam(dev, &pauseparam);
1755
1756         if (copy_to_user(useraddr, &pauseparam, sizeof(pauseparam)))
1757                 return -EFAULT;
1758         return 0;
1759 }
1760
1761 static int ethtool_set_pauseparam(struct net_device *dev, void __user *useraddr)
1762 {
1763         struct ethtool_pauseparam pauseparam;
1764
1765         if (!dev->ethtool_ops->set_pauseparam)
1766                 return -EOPNOTSUPP;
1767
1768         if (copy_from_user(&pauseparam, useraddr, sizeof(pauseparam)))
1769                 return -EFAULT;
1770
1771         return dev->ethtool_ops->set_pauseparam(dev, &pauseparam);
1772 }
1773
1774 static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
1775 {
1776         struct ethtool_test test;
1777         const struct ethtool_ops *ops = dev->ethtool_ops;
1778         u64 *data;
1779         int ret, test_len;
1780
1781         if (!ops->self_test || !ops->get_sset_count)
1782                 return -EOPNOTSUPP;
1783
1784         test_len = ops->get_sset_count(dev, ETH_SS_TEST);
1785         if (test_len < 0)
1786                 return test_len;
1787         WARN_ON(test_len == 0);
1788
1789         if (copy_from_user(&test, useraddr, sizeof(test)))
1790                 return -EFAULT;
1791
1792         test.len = test_len;
1793         data = kmalloc(test_len * sizeof(u64), GFP_USER);
1794         if (!data)
1795                 return -ENOMEM;
1796
1797         ops->self_test(dev, &test, data);
1798
1799         ret = -EFAULT;
1800         if (copy_to_user(useraddr, &test, sizeof(test)))
1801                 goto out;
1802         useraddr += sizeof(test);
1803         if (copy_to_user(useraddr, data, test.len * sizeof(u64)))
1804                 goto out;
1805         ret = 0;
1806
1807  out:
1808         kfree(data);
1809         return ret;
1810 }
1811
1812 static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
1813 {
1814         struct ethtool_gstrings gstrings;
1815         u8 *data;
1816         int ret;
1817
1818         if (copy_from_user(&gstrings, useraddr, sizeof(gstrings)))
1819                 return -EFAULT;
1820
1821         ret = __ethtool_get_sset_count(dev, gstrings.string_set);
1822         if (ret < 0)
1823                 return ret;
1824         if (ret > S32_MAX / ETH_GSTRING_LEN)
1825                 return -ENOMEM;
1826         WARN_ON_ONCE(!ret);
1827
1828         gstrings.len = ret;
1829         data = vzalloc(gstrings.len * ETH_GSTRING_LEN);
1830         if (gstrings.len && !data)
1831                 return -ENOMEM;
1832
1833         __ethtool_get_strings(dev, gstrings.string_set, data);
1834
1835         ret = -EFAULT;
1836         if (copy_to_user(useraddr, &gstrings, sizeof(gstrings)))
1837                 goto out;
1838         useraddr += sizeof(gstrings);
1839         if (gstrings.len &&
1840             copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))
1841                 goto out;
1842         ret = 0;
1843
1844 out:
1845         vfree(data);
1846         return ret;
1847 }
1848
1849 static int ethtool_phys_id(struct net_device *dev, void __user *useraddr)
1850 {
1851         struct ethtool_value id;
1852         static bool busy;
1853         const struct ethtool_ops *ops = dev->ethtool_ops;
1854         int rc;
1855
1856         if (!ops->set_phys_id)
1857                 return -EOPNOTSUPP;
1858
1859         if (busy)
1860                 return -EBUSY;
1861
1862         if (copy_from_user(&id, useraddr, sizeof(id)))
1863                 return -EFAULT;
1864
1865         rc = ops->set_phys_id(dev, ETHTOOL_ID_ACTIVE);
1866         if (rc < 0)
1867                 return rc;
1868
1869         /* Drop the RTNL lock while waiting, but prevent reentry or
1870          * removal of the device.
1871          */
1872         busy = true;
1873         dev_hold(dev);
1874         rtnl_unlock();
1875
1876         if (rc == 0) {
1877                 /* Driver will handle this itself */
1878                 schedule_timeout_interruptible(
1879                         id.data ? (id.data * HZ) : MAX_SCHEDULE_TIMEOUT);
1880         } else {
1881                 /* Driver expects to be called at twice the frequency in rc */
1882                 int n = rc * 2, i, interval = HZ / n;
1883
1884                 /* Count down seconds */
1885                 do {
1886                         /* Count down iterations per second */
1887                         i = n;
1888                         do {
1889                                 rtnl_lock();
1890                                 rc = ops->set_phys_id(dev,
1891                                     (i & 1) ? ETHTOOL_ID_OFF : ETHTOOL_ID_ON);
1892                                 rtnl_unlock();
1893                                 if (rc)
1894                                         break;
1895                                 schedule_timeout_interruptible(interval);
1896                         } while (!signal_pending(current) && --i != 0);
1897                 } while (!signal_pending(current) &&
1898                          (id.data == 0 || --id.data != 0));
1899         }
1900
1901         rtnl_lock();
1902         dev_put(dev);
1903         busy = false;
1904
1905         (void) ops->set_phys_id(dev, ETHTOOL_ID_INACTIVE);
1906         return rc;
1907 }
1908
1909 static int ethtool_get_stats(struct net_device *dev, void __user *useraddr)
1910 {
1911         struct ethtool_stats stats;
1912         const struct ethtool_ops *ops = dev->ethtool_ops;
1913         u64 *data;
1914         int ret, n_stats;
1915
1916         if (!ops->get_ethtool_stats || !ops->get_sset_count)
1917                 return -EOPNOTSUPP;
1918
1919         n_stats = ops->get_sset_count(dev, ETH_SS_STATS);
1920         if (n_stats < 0)
1921                 return n_stats;
1922         if (n_stats > S32_MAX / sizeof(u64))
1923                 return -ENOMEM;
1924         WARN_ON_ONCE(!n_stats);
1925         if (copy_from_user(&stats, useraddr, sizeof(stats)))
1926                 return -EFAULT;
1927
1928         stats.n_stats = n_stats;
1929         data = vzalloc(n_stats * sizeof(u64));
1930         if (n_stats && !data)
1931                 return -ENOMEM;
1932
1933         ops->get_ethtool_stats(dev, &stats, data);
1934
1935         ret = -EFAULT;
1936         if (copy_to_user(useraddr, &stats, sizeof(stats)))
1937                 goto out;
1938         useraddr += sizeof(stats);
1939         if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
1940                 goto out;
1941         ret = 0;
1942
1943  out:
1944         vfree(data);
1945         return ret;
1946 }
1947
1948 static int ethtool_get_phy_stats(struct net_device *dev, void __user *useraddr)
1949 {
1950         struct ethtool_stats stats;
1951         struct phy_device *phydev = dev->phydev;
1952         u64 *data;
1953         int ret, n_stats;
1954
1955         if (!phydev)
1956                 return -EOPNOTSUPP;
1957
1958         n_stats = phy_get_sset_count(phydev);
1959         if (n_stats < 0)
1960                 return n_stats;
1961         if (n_stats > S32_MAX / sizeof(u64))
1962                 return -ENOMEM;
1963         WARN_ON_ONCE(!n_stats);
1964
1965         if (copy_from_user(&stats, useraddr, sizeof(stats)))
1966                 return -EFAULT;
1967
1968         stats.n_stats = n_stats;
1969         data = vzalloc(n_stats * sizeof(u64));
1970         if (n_stats && !data)
1971                 return -ENOMEM;
1972
1973         mutex_lock(&phydev->lock);
1974         phydev->drv->get_stats(phydev, &stats, data);
1975         mutex_unlock(&phydev->lock);
1976
1977         ret = -EFAULT;
1978         if (copy_to_user(useraddr, &stats, sizeof(stats)))
1979                 goto out;
1980         useraddr += sizeof(stats);
1981         if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
1982                 goto out;
1983         ret = 0;
1984
1985  out:
1986         vfree(data);
1987         return ret;
1988 }
1989
1990 static int ethtool_get_perm_addr(struct net_device *dev, void __user *useraddr)
1991 {
1992         struct ethtool_perm_addr epaddr;
1993
1994         if (copy_from_user(&epaddr, useraddr, sizeof(epaddr)))
1995                 return -EFAULT;
1996
1997         if (epaddr.size < dev->addr_len)
1998                 return -ETOOSMALL;
1999         epaddr.size = dev->addr_len;
2000
2001         if (copy_to_user(useraddr, &epaddr, sizeof(epaddr)))
2002                 return -EFAULT;
2003         useraddr += sizeof(epaddr);
2004         if (copy_to_user(useraddr, dev->perm_addr, epaddr.size))
2005                 return -EFAULT;
2006         return 0;
2007 }
2008
2009 static int ethtool_get_value(struct net_device *dev, char __user *useraddr,
2010                              u32 cmd, u32 (*actor)(struct net_device *))
2011 {
2012         struct ethtool_value edata = { .cmd = cmd };
2013
2014         if (!actor)
2015                 return -EOPNOTSUPP;
2016
2017         edata.data = actor(dev);
2018
2019         if (copy_to_user(useraddr, &edata, sizeof(edata)))
2020                 return -EFAULT;
2021         return 0;
2022 }
2023
2024 static int ethtool_set_value_void(struct net_device *dev, char __user *useraddr,
2025                              void (*actor)(struct net_device *, u32))
2026 {
2027         struct ethtool_value edata;
2028
2029         if (!actor)
2030                 return -EOPNOTSUPP;
2031
2032         if (copy_from_user(&edata, useraddr, sizeof(edata)))
2033                 return -EFAULT;
2034
2035         actor(dev, edata.data);
2036         return 0;
2037 }
2038
2039 static int ethtool_set_value(struct net_device *dev, char __user *useraddr,
2040                              int (*actor)(struct net_device *, u32))
2041 {
2042         struct ethtool_value edata;
2043
2044         if (!actor)
2045                 return -EOPNOTSUPP;
2046
2047         if (copy_from_user(&edata, useraddr, sizeof(edata)))
2048                 return -EFAULT;
2049
2050         return actor(dev, edata.data);
2051 }
2052
2053 static noinline_for_stack int ethtool_flash_device(struct net_device *dev,
2054                                                    char __user *useraddr)
2055 {
2056         struct ethtool_flash efl;
2057
2058         if (copy_from_user(&efl, useraddr, sizeof(efl)))
2059                 return -EFAULT;
2060
2061         if (!dev->ethtool_ops->flash_device)
2062                 return -EOPNOTSUPP;
2063
2064         efl.data[ETHTOOL_FLASH_MAX_FILENAME - 1] = 0;
2065
2066         return dev->ethtool_ops->flash_device(dev, &efl);
2067 }
2068
2069 static int ethtool_set_dump(struct net_device *dev,
2070                         void __user *useraddr)
2071 {
2072         struct ethtool_dump dump;
2073
2074         if (!dev->ethtool_ops->set_dump)
2075                 return -EOPNOTSUPP;
2076
2077         if (copy_from_user(&dump, useraddr, sizeof(dump)))
2078                 return -EFAULT;
2079
2080         return dev->ethtool_ops->set_dump(dev, &dump);
2081 }
2082
2083 static int ethtool_get_dump_flag(struct net_device *dev,
2084                                 void __user *useraddr)
2085 {
2086         int ret;
2087         struct ethtool_dump dump;
2088         const struct ethtool_ops *ops = dev->ethtool_ops;
2089
2090         if (!ops->get_dump_flag)
2091                 return -EOPNOTSUPP;
2092
2093         if (copy_from_user(&dump, useraddr, sizeof(dump)))
2094                 return -EFAULT;
2095
2096         ret = ops->get_dump_flag(dev, &dump);
2097         if (ret)
2098                 return ret;
2099
2100         if (copy_to_user(useraddr, &dump, sizeof(dump)))
2101                 return -EFAULT;
2102         return 0;
2103 }
2104
2105 static int ethtool_get_dump_data(struct net_device *dev,
2106                                 void __user *useraddr)
2107 {
2108         int ret;
2109         __u32 len;
2110         struct ethtool_dump dump, tmp;
2111         const struct ethtool_ops *ops = dev->ethtool_ops;
2112         void *data = NULL;
2113
2114         if (!ops->get_dump_data || !ops->get_dump_flag)
2115                 return -EOPNOTSUPP;
2116
2117         if (copy_from_user(&dump, useraddr, sizeof(dump)))
2118                 return -EFAULT;
2119
2120         memset(&tmp, 0, sizeof(tmp));
2121         tmp.cmd = ETHTOOL_GET_DUMP_FLAG;
2122         ret = ops->get_dump_flag(dev, &tmp);
2123         if (ret)
2124                 return ret;
2125
2126         len = min(tmp.len, dump.len);
2127         if (!len)
2128                 return -EFAULT;
2129
2130         /* Don't ever let the driver think there's more space available
2131          * than it requested with .get_dump_flag().
2132          */
2133         dump.len = len;
2134
2135         /* Always allocate enough space to hold the whole thing so that the
2136          * driver does not need to check the length and bother with partial
2137          * dumping.
2138          */
2139         data = vzalloc(tmp.len);
2140         if (!data)
2141                 return -ENOMEM;
2142         ret = ops->get_dump_data(dev, &dump, data);
2143         if (ret)
2144                 goto out;
2145
2146         /* There are two sane possibilities:
2147          * 1. The driver's .get_dump_data() does not touch dump.len.
2148          * 2. Or it may set dump.len to how much it really writes, which
2149          *    should be tmp.len (or len if it can do a partial dump).
2150          * In any case respond to userspace with the actual length of data
2151          * it's receiving.
2152          */
2153         WARN_ON(dump.len != len && dump.len != tmp.len);
2154         dump.len = len;
2155
2156         if (copy_to_user(useraddr, &dump, sizeof(dump))) {
2157                 ret = -EFAULT;
2158                 goto out;
2159         }
2160         useraddr += offsetof(struct ethtool_dump, data);
2161         if (copy_to_user(useraddr, data, len))
2162                 ret = -EFAULT;
2163 out:
2164         vfree(data);
2165         return ret;
2166 }
2167
2168 static int ethtool_get_ts_info(struct net_device *dev, void __user *useraddr)
2169 {
2170         int err = 0;
2171         struct ethtool_ts_info info;
2172         const struct ethtool_ops *ops = dev->ethtool_ops;
2173         struct phy_device *phydev = dev->phydev;
2174
2175         memset(&info, 0, sizeof(info));
2176         info.cmd = ETHTOOL_GET_TS_INFO;
2177
2178         if (phydev && phydev->drv && phydev->drv->ts_info) {
2179                 err = phydev->drv->ts_info(phydev, &info);
2180         } else if (ops->get_ts_info) {
2181                 err = ops->get_ts_info(dev, &info);
2182         } else {
2183                 info.so_timestamping =
2184                         SOF_TIMESTAMPING_RX_SOFTWARE |
2185                         SOF_TIMESTAMPING_SOFTWARE;
2186                 info.phc_index = -1;
2187         }
2188
2189         if (err)
2190                 return err;
2191
2192         if (copy_to_user(useraddr, &info, sizeof(info)))
2193                 err = -EFAULT;
2194
2195         return err;
2196 }
2197
2198 static int __ethtool_get_module_info(struct net_device *dev,
2199                                      struct ethtool_modinfo *modinfo)
2200 {
2201         const struct ethtool_ops *ops = dev->ethtool_ops;
2202         struct phy_device *phydev = dev->phydev;
2203
2204         if (phydev && phydev->drv && phydev->drv->module_info)
2205                 return phydev->drv->module_info(phydev, modinfo);
2206
2207         if (ops->get_module_info)
2208                 return ops->get_module_info(dev, modinfo);
2209
2210         return -EOPNOTSUPP;
2211 }
2212
2213 static int ethtool_get_module_info(struct net_device *dev,
2214                                    void __user *useraddr)
2215 {
2216         int ret;
2217         struct ethtool_modinfo modinfo;
2218
2219         if (copy_from_user(&modinfo, useraddr, sizeof(modinfo)))
2220                 return -EFAULT;
2221
2222         ret = __ethtool_get_module_info(dev, &modinfo);
2223         if (ret)
2224                 return ret;
2225
2226         if (copy_to_user(useraddr, &modinfo, sizeof(modinfo)))
2227                 return -EFAULT;
2228
2229         return 0;
2230 }
2231
2232 static int __ethtool_get_module_eeprom(struct net_device *dev,
2233                                        struct ethtool_eeprom *ee, u8 *data)
2234 {
2235         const struct ethtool_ops *ops = dev->ethtool_ops;
2236         struct phy_device *phydev = dev->phydev;
2237
2238         if (phydev && phydev->drv && phydev->drv->module_eeprom)
2239                 return phydev->drv->module_eeprom(phydev, ee, data);
2240
2241         if (ops->get_module_eeprom)
2242                 return ops->get_module_eeprom(dev, ee, data);
2243
2244         return -EOPNOTSUPP;
2245 }
2246
2247 static int ethtool_get_module_eeprom(struct net_device *dev,
2248                                      void __user *useraddr)
2249 {
2250         int ret;
2251         struct ethtool_modinfo modinfo;
2252
2253         ret = __ethtool_get_module_info(dev, &modinfo);
2254         if (ret)
2255                 return ret;
2256
2257         return ethtool_get_any_eeprom(dev, useraddr,
2258                                       __ethtool_get_module_eeprom,
2259                                       modinfo.eeprom_len);
2260 }
2261
2262 static int ethtool_tunable_valid(const struct ethtool_tunable *tuna)
2263 {
2264         switch (tuna->id) {
2265         case ETHTOOL_RX_COPYBREAK:
2266         case ETHTOOL_TX_COPYBREAK:
2267                 if (tuna->len != sizeof(u32) ||
2268                     tuna->type_id != ETHTOOL_TUNABLE_U32)
2269                         return -EINVAL;
2270                 break;
2271         default:
2272                 return -EINVAL;
2273         }
2274
2275         return 0;
2276 }
2277
2278 static int ethtool_get_tunable(struct net_device *dev, void __user *useraddr)
2279 {
2280         int ret;
2281         struct ethtool_tunable tuna;
2282         const struct ethtool_ops *ops = dev->ethtool_ops;
2283         void *data;
2284
2285         if (!ops->get_tunable)
2286                 return -EOPNOTSUPP;
2287         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2288                 return -EFAULT;
2289         ret = ethtool_tunable_valid(&tuna);
2290         if (ret)
2291                 return ret;
2292         data = kmalloc(tuna.len, GFP_USER);
2293         if (!data)
2294                 return -ENOMEM;
2295         ret = ops->get_tunable(dev, &tuna, data);
2296         if (ret)
2297                 goto out;
2298         useraddr += sizeof(tuna);
2299         ret = -EFAULT;
2300         if (copy_to_user(useraddr, data, tuna.len))
2301                 goto out;
2302         ret = 0;
2303
2304 out:
2305         kfree(data);
2306         return ret;
2307 }
2308
2309 static int ethtool_set_tunable(struct net_device *dev, void __user *useraddr)
2310 {
2311         int ret;
2312         struct ethtool_tunable tuna;
2313         const struct ethtool_ops *ops = dev->ethtool_ops;
2314         void *data;
2315
2316         if (!ops->set_tunable)
2317                 return -EOPNOTSUPP;
2318         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2319                 return -EFAULT;
2320         ret = ethtool_tunable_valid(&tuna);
2321         if (ret)
2322                 return ret;
2323         useraddr += sizeof(tuna);
2324         data = memdup_user(useraddr, tuna.len);
2325         if (IS_ERR(data))
2326                 return PTR_ERR(data);
2327         ret = ops->set_tunable(dev, &tuna, data);
2328
2329         kfree(data);
2330         return ret;
2331 }
2332
2333 static int ethtool_get_per_queue_coalesce(struct net_device *dev,
2334                                           void __user *useraddr,
2335                                           struct ethtool_per_queue_op *per_queue_opt)
2336 {
2337         u32 bit;
2338         int ret;
2339         DECLARE_BITMAP(queue_mask, MAX_NUM_QUEUE);
2340
2341         if (!dev->ethtool_ops->get_per_queue_coalesce)
2342                 return -EOPNOTSUPP;
2343
2344         useraddr += sizeof(*per_queue_opt);
2345
2346         bitmap_from_u32array(queue_mask,
2347                              MAX_NUM_QUEUE,
2348                              per_queue_opt->queue_mask,
2349                              DIV_ROUND_UP(MAX_NUM_QUEUE, 32));
2350
2351         for_each_set_bit(bit, queue_mask, MAX_NUM_QUEUE) {
2352                 struct ethtool_coalesce coalesce = { .cmd = ETHTOOL_GCOALESCE };
2353
2354                 ret = dev->ethtool_ops->get_per_queue_coalesce(dev, bit, &coalesce);
2355                 if (ret != 0)
2356                         return ret;
2357                 if (copy_to_user(useraddr, &coalesce, sizeof(coalesce)))
2358                         return -EFAULT;
2359                 useraddr += sizeof(coalesce);
2360         }
2361
2362         return 0;
2363 }
2364
2365 static int ethtool_set_per_queue_coalesce(struct net_device *dev,
2366                                           void __user *useraddr,
2367                                           struct ethtool_per_queue_op *per_queue_opt)
2368 {
2369         u32 bit;
2370         int i, ret = 0;
2371         int n_queue;
2372         struct ethtool_coalesce *backup = NULL, *tmp = NULL;
2373         DECLARE_BITMAP(queue_mask, MAX_NUM_QUEUE);
2374
2375         if ((!dev->ethtool_ops->set_per_queue_coalesce) ||
2376             (!dev->ethtool_ops->get_per_queue_coalesce))
2377                 return -EOPNOTSUPP;
2378
2379         useraddr += sizeof(*per_queue_opt);
2380
2381         bitmap_from_u32array(queue_mask,
2382                              MAX_NUM_QUEUE,
2383                              per_queue_opt->queue_mask,
2384                              DIV_ROUND_UP(MAX_NUM_QUEUE, 32));
2385         n_queue = bitmap_weight(queue_mask, MAX_NUM_QUEUE);
2386         tmp = backup = kmalloc_array(n_queue, sizeof(*backup), GFP_KERNEL);
2387         if (!backup)
2388                 return -ENOMEM;
2389
2390         for_each_set_bit(bit, queue_mask, MAX_NUM_QUEUE) {
2391                 struct ethtool_coalesce coalesce;
2392
2393                 ret = dev->ethtool_ops->get_per_queue_coalesce(dev, bit, tmp);
2394                 if (ret != 0)
2395                         goto roll_back;
2396
2397                 tmp++;
2398
2399                 if (copy_from_user(&coalesce, useraddr, sizeof(coalesce))) {
2400                         ret = -EFAULT;
2401                         goto roll_back;
2402                 }
2403
2404                 ret = dev->ethtool_ops->set_per_queue_coalesce(dev, bit, &coalesce);
2405                 if (ret != 0)
2406                         goto roll_back;
2407
2408                 useraddr += sizeof(coalesce);
2409         }
2410
2411 roll_back:
2412         if (ret != 0) {
2413                 tmp = backup;
2414                 for_each_set_bit(i, queue_mask, bit) {
2415                         dev->ethtool_ops->set_per_queue_coalesce(dev, i, tmp);
2416                         tmp++;
2417                 }
2418         }
2419         kfree(backup);
2420
2421         return ret;
2422 }
2423
2424 static int ethtool_set_per_queue(struct net_device *dev, void __user *useraddr)
2425 {
2426         struct ethtool_per_queue_op per_queue_opt;
2427
2428         if (copy_from_user(&per_queue_opt, useraddr, sizeof(per_queue_opt)))
2429                 return -EFAULT;
2430
2431         switch (per_queue_opt.sub_command) {
2432         case ETHTOOL_GCOALESCE:
2433                 return ethtool_get_per_queue_coalesce(dev, useraddr, &per_queue_opt);
2434         case ETHTOOL_SCOALESCE:
2435                 return ethtool_set_per_queue_coalesce(dev, useraddr, &per_queue_opt);
2436         default:
2437                 return -EOPNOTSUPP;
2438         };
2439 }
2440
2441 static int ethtool_phy_tunable_valid(const struct ethtool_tunable *tuna)
2442 {
2443         switch (tuna->id) {
2444         case ETHTOOL_PHY_DOWNSHIFT:
2445                 if (tuna->len != sizeof(u8) ||
2446                     tuna->type_id != ETHTOOL_TUNABLE_U8)
2447                         return -EINVAL;
2448                 break;
2449         default:
2450                 return -EINVAL;
2451         }
2452
2453         return 0;
2454 }
2455
2456 static int get_phy_tunable(struct net_device *dev, void __user *useraddr)
2457 {
2458         int ret;
2459         struct ethtool_tunable tuna;
2460         struct phy_device *phydev = dev->phydev;
2461         void *data;
2462
2463         if (!(phydev && phydev->drv && phydev->drv->get_tunable))
2464                 return -EOPNOTSUPP;
2465
2466         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2467                 return -EFAULT;
2468         ret = ethtool_phy_tunable_valid(&tuna);
2469         if (ret)
2470                 return ret;
2471         data = kmalloc(tuna.len, GFP_USER);
2472         if (!data)
2473                 return -ENOMEM;
2474         mutex_lock(&phydev->lock);
2475         ret = phydev->drv->get_tunable(phydev, &tuna, data);
2476         mutex_unlock(&phydev->lock);
2477         if (ret)
2478                 goto out;
2479         useraddr += sizeof(tuna);
2480         ret = -EFAULT;
2481         if (copy_to_user(useraddr, data, tuna.len))
2482                 goto out;
2483         ret = 0;
2484
2485 out:
2486         kfree(data);
2487         return ret;
2488 }
2489
2490 static int set_phy_tunable(struct net_device *dev, void __user *useraddr)
2491 {
2492         int ret;
2493         struct ethtool_tunable tuna;
2494         struct phy_device *phydev = dev->phydev;
2495         void *data;
2496
2497         if (!(phydev && phydev->drv && phydev->drv->set_tunable))
2498                 return -EOPNOTSUPP;
2499         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2500                 return -EFAULT;
2501         ret = ethtool_phy_tunable_valid(&tuna);
2502         if (ret)
2503                 return ret;
2504         useraddr += sizeof(tuna);
2505         data = memdup_user(useraddr, tuna.len);
2506         if (IS_ERR(data))
2507                 return PTR_ERR(data);
2508         mutex_lock(&phydev->lock);
2509         ret = phydev->drv->set_tunable(phydev, &tuna, data);
2510         mutex_unlock(&phydev->lock);
2511
2512         kfree(data);
2513         return ret;
2514 }
2515
2516 static int ethtool_get_fecparam(struct net_device *dev, void __user *useraddr)
2517 {
2518         struct ethtool_fecparam fecparam = { ETHTOOL_GFECPARAM };
2519
2520         if (!dev->ethtool_ops->get_fecparam)
2521                 return -EOPNOTSUPP;
2522
2523         dev->ethtool_ops->get_fecparam(dev, &fecparam);
2524
2525         if (copy_to_user(useraddr, &fecparam, sizeof(fecparam)))
2526                 return -EFAULT;
2527         return 0;
2528 }
2529
2530 static int ethtool_set_fecparam(struct net_device *dev, void __user *useraddr)
2531 {
2532         struct ethtool_fecparam fecparam;
2533
2534         if (!dev->ethtool_ops->set_fecparam)
2535                 return -EOPNOTSUPP;
2536
2537         if (copy_from_user(&fecparam, useraddr, sizeof(fecparam)))
2538                 return -EFAULT;
2539
2540         return dev->ethtool_ops->set_fecparam(dev, &fecparam);
2541 }
2542
2543 /* The main entry point in this file.  Called from net/core/dev_ioctl.c */
2544
2545 int dev_ethtool(struct net *net, struct ifreq *ifr)
2546 {
2547         struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
2548         void __user *useraddr = ifr->ifr_data;
2549         u32 ethcmd, sub_cmd;
2550         int rc;
2551         netdev_features_t old_features;
2552
2553         if (!dev || !netif_device_present(dev))
2554                 return -ENODEV;
2555
2556         if (copy_from_user(&ethcmd, useraddr, sizeof(ethcmd)))
2557                 return -EFAULT;
2558
2559         if (ethcmd == ETHTOOL_PERQUEUE) {
2560                 if (copy_from_user(&sub_cmd, useraddr + sizeof(ethcmd), sizeof(sub_cmd)))
2561                         return -EFAULT;
2562         } else {
2563                 sub_cmd = ethcmd;
2564         }
2565         /* Allow some commands to be done by anyone */
2566         switch (sub_cmd) {
2567         case ETHTOOL_GSET:
2568         case ETHTOOL_GDRVINFO:
2569         case ETHTOOL_GMSGLVL:
2570         case ETHTOOL_GLINK:
2571         case ETHTOOL_GCOALESCE:
2572         case ETHTOOL_GRINGPARAM:
2573         case ETHTOOL_GPAUSEPARAM:
2574         case ETHTOOL_GRXCSUM:
2575         case ETHTOOL_GTXCSUM:
2576         case ETHTOOL_GSG:
2577         case ETHTOOL_GSSET_INFO:
2578         case ETHTOOL_GSTRINGS:
2579         case ETHTOOL_GSTATS:
2580         case ETHTOOL_GPHYSTATS:
2581         case ETHTOOL_GTSO:
2582         case ETHTOOL_GPERMADDR:
2583         case ETHTOOL_GGSO:
2584         case ETHTOOL_GGRO:
2585         case ETHTOOL_GFLAGS:
2586         case ETHTOOL_GPFLAGS:
2587         case ETHTOOL_GRXFH:
2588         case ETHTOOL_GRXRINGS:
2589         case ETHTOOL_GRXCLSRLCNT:
2590         case ETHTOOL_GRXCLSRULE:
2591         case ETHTOOL_GRXCLSRLALL:
2592         case ETHTOOL_GRXFHINDIR:
2593         case ETHTOOL_GRSSH:
2594         case ETHTOOL_GFEATURES:
2595         case ETHTOOL_GCHANNELS:
2596         case ETHTOOL_GET_TS_INFO:
2597         case ETHTOOL_GEEE:
2598         case ETHTOOL_GTUNABLE:
2599         case ETHTOOL_PHY_GTUNABLE:
2600         case ETHTOOL_GLINKSETTINGS:
2601         case ETHTOOL_GFECPARAM:
2602                 break;
2603         default:
2604                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2605                         return -EPERM;
2606         }
2607
2608         if (dev->ethtool_ops->begin) {
2609                 rc = dev->ethtool_ops->begin(dev);
2610                 if (rc  < 0)
2611                         return rc;
2612         }
2613         old_features = dev->features;
2614
2615         switch (ethcmd) {
2616         case ETHTOOL_GSET:
2617                 rc = ethtool_get_settings(dev, useraddr);
2618                 break;
2619         case ETHTOOL_SSET:
2620                 rc = ethtool_set_settings(dev, useraddr);
2621                 break;
2622         case ETHTOOL_GDRVINFO:
2623                 rc = ethtool_get_drvinfo(dev, useraddr);
2624                 break;
2625         case ETHTOOL_GREGS:
2626                 rc = ethtool_get_regs(dev, useraddr);
2627                 break;
2628         case ETHTOOL_GWOL:
2629                 rc = ethtool_get_wol(dev, useraddr);
2630                 break;
2631         case ETHTOOL_SWOL:
2632                 rc = ethtool_set_wol(dev, useraddr);
2633                 break;
2634         case ETHTOOL_GMSGLVL:
2635                 rc = ethtool_get_value(dev, useraddr, ethcmd,
2636                                        dev->ethtool_ops->get_msglevel);
2637                 break;
2638         case ETHTOOL_SMSGLVL:
2639                 rc = ethtool_set_value_void(dev, useraddr,
2640                                        dev->ethtool_ops->set_msglevel);
2641                 break;
2642         case ETHTOOL_GEEE:
2643                 rc = ethtool_get_eee(dev, useraddr);
2644                 break;
2645         case ETHTOOL_SEEE:
2646                 rc = ethtool_set_eee(dev, useraddr);
2647                 break;
2648         case ETHTOOL_NWAY_RST:
2649                 rc = ethtool_nway_reset(dev);
2650                 break;
2651         case ETHTOOL_GLINK:
2652                 rc = ethtool_get_link(dev, useraddr);
2653                 break;
2654         case ETHTOOL_GEEPROM:
2655                 rc = ethtool_get_eeprom(dev, useraddr);
2656                 break;
2657         case ETHTOOL_SEEPROM:
2658                 rc = ethtool_set_eeprom(dev, useraddr);
2659                 break;
2660         case ETHTOOL_GCOALESCE:
2661                 rc = ethtool_get_coalesce(dev, useraddr);
2662                 break;
2663         case ETHTOOL_SCOALESCE:
2664                 rc = ethtool_set_coalesce(dev, useraddr);
2665                 break;
2666         case ETHTOOL_GRINGPARAM:
2667                 rc = ethtool_get_ringparam(dev, useraddr);
2668                 break;
2669         case ETHTOOL_SRINGPARAM:
2670                 rc = ethtool_set_ringparam(dev, useraddr);
2671                 break;
2672         case ETHTOOL_GPAUSEPARAM:
2673                 rc = ethtool_get_pauseparam(dev, useraddr);
2674                 break;
2675         case ETHTOOL_SPAUSEPARAM:
2676                 rc = ethtool_set_pauseparam(dev, useraddr);
2677                 break;
2678         case ETHTOOL_TEST:
2679                 rc = ethtool_self_test(dev, useraddr);
2680                 break;
2681         case ETHTOOL_GSTRINGS:
2682                 rc = ethtool_get_strings(dev, useraddr);
2683                 break;
2684         case ETHTOOL_PHYS_ID:
2685                 rc = ethtool_phys_id(dev, useraddr);
2686                 break;
2687         case ETHTOOL_GSTATS:
2688                 rc = ethtool_get_stats(dev, useraddr);
2689                 break;
2690         case ETHTOOL_GPERMADDR:
2691                 rc = ethtool_get_perm_addr(dev, useraddr);
2692                 break;
2693         case ETHTOOL_GFLAGS:
2694                 rc = ethtool_get_value(dev, useraddr, ethcmd,
2695                                         __ethtool_get_flags);
2696                 break;
2697         case ETHTOOL_SFLAGS:
2698                 rc = ethtool_set_value(dev, useraddr, __ethtool_set_flags);
2699                 break;
2700         case ETHTOOL_GPFLAGS:
2701                 rc = ethtool_get_value(dev, useraddr, ethcmd,
2702                                        dev->ethtool_ops->get_priv_flags);
2703                 break;
2704         case ETHTOOL_SPFLAGS:
2705                 rc = ethtool_set_value(dev, useraddr,
2706                                        dev->ethtool_ops->set_priv_flags);
2707                 break;
2708         case ETHTOOL_GRXFH:
2709         case ETHTOOL_GRXRINGS:
2710         case ETHTOOL_GRXCLSRLCNT:
2711         case ETHTOOL_GRXCLSRULE:
2712         case ETHTOOL_GRXCLSRLALL:
2713                 rc = ethtool_get_rxnfc(dev, ethcmd, useraddr);
2714                 break;
2715         case ETHTOOL_SRXFH:
2716         case ETHTOOL_SRXCLSRLDEL:
2717         case ETHTOOL_SRXCLSRLINS:
2718                 rc = ethtool_set_rxnfc(dev, ethcmd, useraddr);
2719                 break;
2720         case ETHTOOL_FLASHDEV:
2721                 rc = ethtool_flash_device(dev, useraddr);
2722                 break;
2723         case ETHTOOL_RESET:
2724                 rc = ethtool_reset(dev, useraddr);
2725                 break;
2726         case ETHTOOL_GSSET_INFO:
2727                 rc = ethtool_get_sset_info(dev, useraddr);
2728                 break;
2729         case ETHTOOL_GRXFHINDIR:
2730                 rc = ethtool_get_rxfh_indir(dev, useraddr);
2731                 break;
2732         case ETHTOOL_SRXFHINDIR:
2733                 rc = ethtool_set_rxfh_indir(dev, useraddr);
2734                 break;
2735         case ETHTOOL_GRSSH:
2736                 rc = ethtool_get_rxfh(dev, useraddr);
2737                 break;
2738         case ETHTOOL_SRSSH:
2739                 rc = ethtool_set_rxfh(dev, useraddr);
2740                 break;
2741         case ETHTOOL_GFEATURES:
2742                 rc = ethtool_get_features(dev, useraddr);
2743                 break;
2744         case ETHTOOL_SFEATURES:
2745                 rc = ethtool_set_features(dev, useraddr);
2746                 break;
2747         case ETHTOOL_GTXCSUM:
2748         case ETHTOOL_GRXCSUM:
2749         case ETHTOOL_GSG:
2750         case ETHTOOL_GTSO:
2751         case ETHTOOL_GGSO:
2752         case ETHTOOL_GGRO:
2753                 rc = ethtool_get_one_feature(dev, useraddr, ethcmd);
2754                 break;
2755         case ETHTOOL_STXCSUM:
2756         case ETHTOOL_SRXCSUM:
2757         case ETHTOOL_SSG:
2758         case ETHTOOL_STSO:
2759         case ETHTOOL_SGSO:
2760         case ETHTOOL_SGRO:
2761                 rc = ethtool_set_one_feature(dev, useraddr, ethcmd);
2762                 break;
2763         case ETHTOOL_GCHANNELS:
2764                 rc = ethtool_get_channels(dev, useraddr);
2765                 break;
2766         case ETHTOOL_SCHANNELS:
2767                 rc = ethtool_set_channels(dev, useraddr);
2768                 break;
2769         case ETHTOOL_SET_DUMP:
2770                 rc = ethtool_set_dump(dev, useraddr);
2771                 break;
2772         case ETHTOOL_GET_DUMP_FLAG:
2773                 rc = ethtool_get_dump_flag(dev, useraddr);
2774                 break;
2775         case ETHTOOL_GET_DUMP_DATA:
2776                 rc = ethtool_get_dump_data(dev, useraddr);
2777                 break;
2778         case ETHTOOL_GET_TS_INFO:
2779                 rc = ethtool_get_ts_info(dev, useraddr);
2780                 break;
2781         case ETHTOOL_GMODULEINFO:
2782                 rc = ethtool_get_module_info(dev, useraddr);
2783                 break;
2784         case ETHTOOL_GMODULEEEPROM:
2785                 rc = ethtool_get_module_eeprom(dev, useraddr);
2786                 break;
2787         case ETHTOOL_GTUNABLE:
2788                 rc = ethtool_get_tunable(dev, useraddr);
2789                 break;
2790         case ETHTOOL_STUNABLE:
2791                 rc = ethtool_set_tunable(dev, useraddr);
2792                 break;
2793         case ETHTOOL_GPHYSTATS:
2794                 rc = ethtool_get_phy_stats(dev, useraddr);
2795                 break;
2796         case ETHTOOL_PERQUEUE:
2797                 rc = ethtool_set_per_queue(dev, useraddr);
2798                 break;
2799         case ETHTOOL_GLINKSETTINGS:
2800                 rc = ethtool_get_link_ksettings(dev, useraddr);
2801                 break;
2802         case ETHTOOL_SLINKSETTINGS:
2803                 rc = ethtool_set_link_ksettings(dev, useraddr);
2804                 break;
2805         case ETHTOOL_PHY_GTUNABLE:
2806                 rc = get_phy_tunable(dev, useraddr);
2807                 break;
2808         case ETHTOOL_PHY_STUNABLE:
2809                 rc = set_phy_tunable(dev, useraddr);
2810                 break;
2811         case ETHTOOL_GFECPARAM:
2812                 rc = ethtool_get_fecparam(dev, useraddr);
2813                 break;
2814         case ETHTOOL_SFECPARAM:
2815                 rc = ethtool_set_fecparam(dev, useraddr);
2816                 break;
2817         default:
2818                 rc = -EOPNOTSUPP;
2819         }
2820
2821         if (dev->ethtool_ops->complete)
2822                 dev->ethtool_ops->complete(dev);
2823
2824         if (old_features != dev->features)
2825                 netdev_features_change(dev);
2826
2827         return rc;
2828 }