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_GRO_HW_BIT] =           "rx-gro-hw",
  77         [NETIF_F_LRO_BIT] =              "rx-lro",
  78
  79         [NETIF_F_TSO_BIT] =              "tx-tcp-segmentation",
  80         [NETIF_F_GSO_ROBUST_BIT] =       "tx-gso-robust",
  81         [NETIF_F_TSO_ECN_BIT] =          "tx-tcp-ecn-segmentation",
  82         [NETIF_F_TSO_MANGLEID_BIT] =     "tx-tcp-mangleid-segmentation",
  83         [NETIF_F_TSO6_BIT] =             "tx-tcp6-segmentation",
  84         [NETIF_F_FSO_BIT] =              "tx-fcoe-segmentation",
  85         [NETIF_F_GSO_GRE_BIT] =          "tx-gre-segmentation",
  86         [NETIF_F_GSO_GRE_CSUM_BIT] =     "tx-gre-csum-segmentation",
  87         [NETIF_F_GSO_IPXIP4_BIT] =       "tx-ipxip4-segmentation",
  88         [NETIF_F_GSO_IPXIP6_BIT] =       "tx-ipxip6-segmentation",
  89         [NETIF_F_GSO_UDP_TUNNEL_BIT] =   "tx-udp_tnl-segmentation",
  90         [NETIF_F_GSO_UDP_TUNNEL_CSUM_BIT] = "tx-udp_tnl-csum-segmentation",
  91         [NETIF_F_GSO_PARTIAL_BIT] =      "tx-gso-partial",
  92         [NETIF_F_GSO_SCTP_BIT] =         "tx-sctp-segmentation",
  93         [NETIF_F_GSO_ESP_BIT] =          "tx-esp-segmentation",
  94
  95         [NETIF_F_FCOE_CRC_BIT] =         "tx-checksum-fcoe-crc",
  96         [NETIF_F_SCTP_CRC_BIT] =        "tx-checksum-sctp",
  97         [NETIF_F_FCOE_MTU_BIT] =         "fcoe-mtu",
  98         [NETIF_F_NTUPLE_BIT] =           "rx-ntuple-filter",
  99         [NETIF_F_RXHASH_BIT] =           "rx-hashing",
 100         [NETIF_F_RXCSUM_BIT] =           "rx-checksum",
 101         [NETIF_F_NOCACHE_COPY_BIT] =     "tx-nocache-copy",
 102         [NETIF_F_LOOPBACK_BIT] =         "loopback",
 103         [NETIF_F_RXFCS_BIT] =            "rx-fcs",
 104         [NETIF_F_RXALL_BIT] =            "rx-all",
 105         [NETIF_F_HW_L2FW_DOFFLOAD_BIT] = "l2-fwd-offload",
 106         [NETIF_F_HW_TC_BIT] =            "hw-tc-offload",
 107         [NETIF_F_HW_ESP_BIT] =           "esp-hw-offload",
 108         [NETIF_F_HW_ESP_TX_CSUM_BIT] =   "esp-tx-csum-hw-offload",
 109         [NETIF_F_RX_UDP_TUNNEL_PORT_BIT] =       "rx-udp_tunnel-port-offload",
 110 };
 111
 112 static const char
 113 rss_hash_func_strings[ETH_RSS_HASH_FUNCS_COUNT][ETH_GSTRING_LEN] = {
 114         [ETH_RSS_HASH_TOP_BIT] =        "toeplitz",
 115         [ETH_RSS_HASH_XOR_BIT] =        "xor",
 116         [ETH_RSS_HASH_CRC32_BIT] =      "crc32",
 117 };
 118
 119 static const char
 120 tunable_strings[__ETHTOOL_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
 121         [ETHTOOL_ID_UNSPEC]     = "Unspec",
 122         [ETHTOOL_RX_COPYBREAK]  = "rx-copybreak",
 123         [ETHTOOL_TX_COPYBREAK]  = "tx-copybreak",
 124 };
 125
 126 static const char
 127 phy_tunable_strings[__ETHTOOL_PHY_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
 128         [ETHTOOL_ID_UNSPEC]     = "Unspec",
 129         [ETHTOOL_PHY_DOWNSHIFT] = "phy-downshift",
 130 };
 131
 132 static int ethtool_get_features(struct net_device *dev, void __user *useraddr)
 133 {
 134         struct ethtool_gfeatures cmd = {
 135                 .cmd = ETHTOOL_GFEATURES,
 136                 .size = ETHTOOL_DEV_FEATURE_WORDS,
 137         };
 138         struct ethtool_get_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
 139         u32 __user *sizeaddr;
 140         u32 copy_size;
 141         int i;
 142
 143         /* in case feature bits run out again */
 144         BUILD_BUG_ON(ETHTOOL_DEV_FEATURE_WORDS * sizeof(u32) > sizeof(netdev_features_t));
 145
 146         for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
 147                 features[i].available = (u32)(dev->hw_features >> (32 * i));
 148                 features[i].requested = (u32)(dev->wanted_features >> (32 * i));
 149                 features[i].active = (u32)(dev->features >> (32 * i));
 150                 features[i].never_changed =
 151                         (u32)(NETIF_F_NEVER_CHANGE >> (32 * i));
 152         }
 153
 154         sizeaddr = useraddr + offsetof(struct ethtool_gfeatures, size);
 155         if (get_user(copy_size, sizeaddr))
 156                 return -EFAULT;
 157
 158         if (copy_size > ETHTOOL_DEV_FEATURE_WORDS)
 159                 copy_size = ETHTOOL_DEV_FEATURE_WORDS;
 160
 161         if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
 162                 return -EFAULT;
 163         useraddr += sizeof(cmd);
 164         if (copy_to_user(useraddr, features, copy_size * sizeof(*features)))
 165                 return -EFAULT;
 166
 167         return 0;
 168 }
 169
 170 static int ethtool_set_features(struct net_device *dev, void __user *useraddr)
 171 {
 172         struct ethtool_sfeatures cmd;
 173         struct ethtool_set_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
 174         netdev_features_t wanted = 0, valid = 0;
 175         int i, ret = 0;
 176
 177         if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
 178                 return -EFAULT;
 179         useraddr += sizeof(cmd);
 180
 181         if (cmd.size != ETHTOOL_DEV_FEATURE_WORDS)
 182                 return -EINVAL;
 183
 184         if (copy_from_user(features, useraddr, sizeof(features)))
 185                 return -EFAULT;
 186
 187         for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
 188                 valid |= (netdev_features_t)features[i].valid << (32 * i);
 189                 wanted |= (netdev_features_t)features[i].requested << (32 * i);
 190         }
 191
 192         if (valid & ~NETIF_F_ETHTOOL_BITS)
 193                 return -EINVAL;
 194
 195         if (valid & ~dev->hw_features) {
 196                 valid &= dev->hw_features;
 197                 ret |= ETHTOOL_F_UNSUPPORTED;
 198         }
 199
 200         dev->wanted_features &= ~valid;
 201         dev->wanted_features |= wanted & valid;
 202         __netdev_update_features(dev);
 203
 204         if ((dev->wanted_features ^ dev->features) & valid)
 205                 ret |= ETHTOOL_F_WISH;
 206
 207         return ret;
 208 }
 209
 210 static int phy_get_sset_count(struct phy_device *phydev)
 211 {
 212         int ret;
 213
 214         if (phydev->drv->get_sset_count &&
 215             phydev->drv->get_strings &&
 216             phydev->drv->get_stats) {
 217                 mutex_lock(&phydev->lock);
 218                 ret = phydev->drv->get_sset_count(phydev);
 219                 mutex_unlock(&phydev->lock);
 220
 221                 return ret;
 222         }
 223
 224         return -EOPNOTSUPP;
 225 }
 226
 227 static int __ethtool_get_sset_count(struct net_device *dev, int sset)
 228 {
 229         const struct ethtool_ops *ops = dev->ethtool_ops;
 230
 231         if (sset == ETH_SS_FEATURES)
 232                 return ARRAY_SIZE(netdev_features_strings);
 233
 234         if (sset == ETH_SS_RSS_HASH_FUNCS)
 235                 return ARRAY_SIZE(rss_hash_func_strings);
 236
 237         if (sset == ETH_SS_TUNABLES)
 238                 return ARRAY_SIZE(tunable_strings);
 239
 240         if (sset == ETH_SS_PHY_TUNABLES)
 241                 return ARRAY_SIZE(phy_tunable_strings);
 242
 243         if (sset == ETH_SS_PHY_STATS) {
 244                 if (dev->phydev)
 245                         return phy_get_sset_count(dev->phydev);
 246                 else
 247                         return -EOPNOTSUPP;
 248         }
 249
 250         if (ops->get_sset_count && ops->get_strings)
 251                 return ops->get_sset_count(dev, sset);
 252         else
 253                 return -EOPNOTSUPP;
 254 }
 255
 256 static void __ethtool_get_strings(struct net_device *dev,
 257         u32 stringset, u8 *data)
 258 {
 259         const struct ethtool_ops *ops = dev->ethtool_ops;
 260
 261         if (stringset == ETH_SS_FEATURES)
 262                 memcpy(data, netdev_features_strings,
 263                         sizeof(netdev_features_strings));
 264         else if (stringset == ETH_SS_RSS_HASH_FUNCS)
 265                 memcpy(data, rss_hash_func_strings,
 266                        sizeof(rss_hash_func_strings));
 267         else if (stringset == ETH_SS_TUNABLES)
 268                 memcpy(data, tunable_strings, sizeof(tunable_strings));
 269         else if (stringset == ETH_SS_PHY_TUNABLES)
 270                 memcpy(data, phy_tunable_strings, sizeof(phy_tunable_strings));
 271         else if (stringset == ETH_SS_PHY_STATS) {
 272                 struct phy_device *phydev = dev->phydev;
 273
 274                 if (phydev) {
 275                         mutex_lock(&phydev->lock);
 276                         phydev->drv->get_strings(phydev, data);
 277                         mutex_unlock(&phydev->lock);
 278                 } else {
 279                         return;
 280                 }
 281         } else
 282                 /* ops->get_strings is valid because checked earlier */
 283                 ops->get_strings(dev, stringset, data);
 284 }
 285
 286 static netdev_features_t ethtool_get_feature_mask(u32 eth_cmd)
 287 {
 288         /* feature masks of legacy discrete ethtool ops */
 289
 290         switch (eth_cmd) {
 291         case ETHTOOL_GTXCSUM:
 292         case ETHTOOL_STXCSUM:
 293                 return NETIF_F_CSUM_MASK | NETIF_F_SCTP_CRC;
 294         case ETHTOOL_GRXCSUM:
 295         case ETHTOOL_SRXCSUM:
 296                 return NETIF_F_RXCSUM;
 297         case ETHTOOL_GSG:
 298         case ETHTOOL_SSG:
 299                 return NETIF_F_SG;
 300         case ETHTOOL_GTSO:
 301         case ETHTOOL_STSO:
 302                 return NETIF_F_ALL_TSO;
 303         case ETHTOOL_GGSO:
 304         case ETHTOOL_SGSO:
 305                 return NETIF_F_GSO;
 306         case ETHTOOL_GGRO:
 307         case ETHTOOL_SGRO:
 308                 return NETIF_F_GRO;
 309         default:
 310                 BUG();
 311         }
 312 }
 313
 314 static int ethtool_get_one_feature(struct net_device *dev,
 315         char __user *useraddr, u32 ethcmd)
 316 {
 317         netdev_features_t mask = ethtool_get_feature_mask(ethcmd);
 318         struct ethtool_value edata = {
 319                 .cmd = ethcmd,
 320                 .data = !!(dev->features & mask),
 321         };
 322
 323         if (copy_to_user(useraddr, &edata, sizeof(edata)))
 324                 return -EFAULT;
 325         return 0;
 326 }
 327
 328 static int ethtool_set_one_feature(struct net_device *dev,
 329         void __user *useraddr, u32 ethcmd)
 330 {
 331         struct ethtool_value edata;
 332         netdev_features_t mask;
 333
 334         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 335                 return -EFAULT;
 336
 337         mask = ethtool_get_feature_mask(ethcmd);
 338         mask &= dev->hw_features;
 339         if (!mask)
 340                 return -EOPNOTSUPP;
 341
 342         if (edata.data)
 343                 dev->wanted_features |= mask;
 344         else
 345                 dev->wanted_features &= ~mask;
 346
 347         __netdev_update_features(dev);
 348
 349         return 0;
 350 }
 351
 352 #define ETH_ALL_FLAGS    (ETH_FLAG_LRO | ETH_FLAG_RXVLAN | ETH_FLAG_TXVLAN | \
 353                           ETH_FLAG_NTUPLE | ETH_FLAG_RXHASH)
 354 #define ETH_ALL_FEATURES (NETIF_F_LRO | NETIF_F_HW_VLAN_CTAG_RX | \
 355                           NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_NTUPLE | \
 356                           NETIF_F_RXHASH)
 357
 358 static u32 __ethtool_get_flags(struct net_device *dev)
 359 {
 360         u32 flags = 0;
 361
 362         if (dev->features & NETIF_F_LRO)
 363                 flags |= ETH_FLAG_LRO;
 364         if (dev->features & NETIF_F_HW_VLAN_CTAG_RX)
 365                 flags |= ETH_FLAG_RXVLAN;
 366         if (dev->features & NETIF_F_HW_VLAN_CTAG_TX)
 367                 flags |= ETH_FLAG_TXVLAN;
 368         if (dev->features & NETIF_F_NTUPLE)
 369                 flags |= ETH_FLAG_NTUPLE;
 370         if (dev->features & NETIF_F_RXHASH)
 371                 flags |= ETH_FLAG_RXHASH;
 372
 373         return flags;
 374 }
 375
 376 static int __ethtool_set_flags(struct net_device *dev, u32 data)
 377 {
 378         netdev_features_t features = 0, changed;
 379
 380         if (data & ~ETH_ALL_FLAGS)
 381                 return -EINVAL;
 382
 383         if (data & ETH_FLAG_LRO)
 384                 features |= NETIF_F_LRO;
 385         if (data & ETH_FLAG_RXVLAN)
 386                 features |= NETIF_F_HW_VLAN_CTAG_RX;
 387         if (data & ETH_FLAG_TXVLAN)
 388                 features |= NETIF_F_HW_VLAN_CTAG_TX;
 389         if (data & ETH_FLAG_NTUPLE)
 390                 features |= NETIF_F_NTUPLE;
 391         if (data & ETH_FLAG_RXHASH)
 392                 features |= NETIF_F_RXHASH;
 393
 394         /* allow changing only bits set in hw_features */
 395         changed = (features ^ dev->features) & ETH_ALL_FEATURES;
 396         if (changed & ~dev->hw_features)
 397                 return (changed & dev->hw_features) ? -EINVAL : -EOPNOTSUPP;
 398
 399         dev->wanted_features =
 400                 (dev->wanted_features & ~changed) | (features & changed);
 401
 402         __netdev_update_features(dev);
 403
 404         return 0;
 405 }
 406
 407 /* Given two link masks, AND them together and save the result in dst. */
 408 void ethtool_intersect_link_masks(struct ethtool_link_ksettings *dst,
 409                                   struct ethtool_link_ksettings *src)
 410 {
 411         unsigned int size = BITS_TO_LONGS(__ETHTOOL_LINK_MODE_MASK_NBITS);
 412         unsigned int idx = 0;
 413
 414         for (; idx < size; idx++) {
 415                 dst->link_modes.supported[idx] &=
 416                         src->link_modes.supported[idx];
 417                 dst->link_modes.advertising[idx] &=
 418                         src->link_modes.advertising[idx];
 419         }
 420 }
 421 EXPORT_SYMBOL(ethtool_intersect_link_masks);
 422
 423 void ethtool_convert_legacy_u32_to_link_mode(unsigned long *dst,
 424                                              u32 legacy_u32)
 425 {
 426         bitmap_zero(dst, __ETHTOOL_LINK_MODE_MASK_NBITS);
 427         dst[0] = legacy_u32;
 428 }
 429 EXPORT_SYMBOL(ethtool_convert_legacy_u32_to_link_mode);
 430
 431 /* return false if src had higher bits set. lower bits always updated. */
 432 bool ethtool_convert_link_mode_to_legacy_u32(u32 *legacy_u32,
 433                                              const unsigned long *src)
 434 {
 435         bool retval = true;
 436
 437         /* TODO: following test will soon always be true */
 438         if (__ETHTOOL_LINK_MODE_MASK_NBITS > 32) {
 439                 __ETHTOOL_DECLARE_LINK_MODE_MASK(ext);
 440
 441                 bitmap_zero(ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
 442                 bitmap_fill(ext, 32);
 443                 bitmap_complement(ext, ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
 444                 if (bitmap_intersects(ext, src,
 445                                       __ETHTOOL_LINK_MODE_MASK_NBITS)) {
 446                         /* src mask goes beyond bit 31 */
 447                         retval = false;
 448                 }
 449         }
 450         *legacy_u32 = src[0];
 451         return retval;
 452 }
 453 EXPORT_SYMBOL(ethtool_convert_link_mode_to_legacy_u32);
 454
 455 /* return false if legacy contained non-0 deprecated fields
 456  * maxtxpkt/maxrxpkt. rest of ksettings always updated
 457  */
 458 static bool
 459 convert_legacy_settings_to_link_ksettings(
 460         struct ethtool_link_ksettings *link_ksettings,
 461         const struct ethtool_cmd *legacy_settings)
 462 {
 463         bool retval = true;
 464
 465         memset(link_ksettings, 0, sizeof(*link_ksettings));
 466
 467         /* This is used to tell users that driver is still using these
 468          * deprecated legacy fields, and they should not use
 469          * %ETHTOOL_GLINKSETTINGS/%ETHTOOL_SLINKSETTINGS
 470          */
 471         if (legacy_settings->maxtxpkt ||
 472             legacy_settings->maxrxpkt)
 473                 retval = false;
 474
 475         ethtool_convert_legacy_u32_to_link_mode(
 476                 link_ksettings->link_modes.supported,
 477                 legacy_settings->supported);
 478         ethtool_convert_legacy_u32_to_link_mode(
 479                 link_ksettings->link_modes.advertising,
 480                 legacy_settings->advertising);
 481         ethtool_convert_legacy_u32_to_link_mode(
 482                 link_ksettings->link_modes.lp_advertising,
 483                 legacy_settings->lp_advertising);
 484         link_ksettings->base.speed
 485                 = ethtool_cmd_speed(legacy_settings);
 486         link_ksettings->base.duplex
 487                 = legacy_settings->duplex;
 488         link_ksettings->base.port
 489                 = legacy_settings->port;
 490         link_ksettings->base.phy_address
 491                 = legacy_settings->phy_address;
 492         link_ksettings->base.autoneg
 493                 = legacy_settings->autoneg;
 494         link_ksettings->base.mdio_support
 495                 = legacy_settings->mdio_support;
 496         link_ksettings->base.eth_tp_mdix
 497                 = legacy_settings->eth_tp_mdix;
 498         link_ksettings->base.eth_tp_mdix_ctrl
 499                 = legacy_settings->eth_tp_mdix_ctrl;
 500         return retval;
 501 }
 502
 503 /* return false if ksettings link modes had higher bits
 504  * set. legacy_settings always updated (best effort)
 505  */
 506 static bool
 507 convert_link_ksettings_to_legacy_settings(
 508         struct ethtool_cmd *legacy_settings,
 509         const struct ethtool_link_ksettings *link_ksettings)
 510 {
 511         bool retval = true;
 512
 513         memset(legacy_settings, 0, sizeof(*legacy_settings));
 514         /* this also clears the deprecated fields in legacy structure:
 515          * __u8         transceiver;
 516          * __u32        maxtxpkt;
 517          * __u32        maxrxpkt;
 518          */
 519
 520         retval &= ethtool_convert_link_mode_to_legacy_u32(
 521                 &legacy_settings->supported,
 522                 link_ksettings->link_modes.supported);
 523         retval &= ethtool_convert_link_mode_to_legacy_u32(
 524                 &legacy_settings->advertising,
 525                 link_ksettings->link_modes.advertising);
 526         retval &= ethtool_convert_link_mode_to_legacy_u32(
 527                 &legacy_settings->lp_advertising,
 528                 link_ksettings->link_modes.lp_advertising);
 529         ethtool_cmd_speed_set(legacy_settings, link_ksettings->base.speed);
 530         legacy_settings->duplex
 531                 = link_ksettings->base.duplex;
 532         legacy_settings->port
 533                 = link_ksettings->base.port;
 534         legacy_settings->phy_address
 535                 = link_ksettings->base.phy_address;
 536         legacy_settings->autoneg
 537                 = link_ksettings->base.autoneg;
 538         legacy_settings->mdio_support
 539                 = link_ksettings->base.mdio_support;
 540         legacy_settings->eth_tp_mdix
 541                 = link_ksettings->base.eth_tp_mdix;
 542         legacy_settings->eth_tp_mdix_ctrl
 543                 = link_ksettings->base.eth_tp_mdix_ctrl;
 544         legacy_settings->transceiver
 545                 = link_ksettings->base.transceiver;
 546         return retval;
 547 }
 548
 549 /* number of 32-bit words to store the user's link mode bitmaps */
 550 #define __ETHTOOL_LINK_MODE_MASK_NU32                   \
 551         DIV_ROUND_UP(__ETHTOOL_LINK_MODE_MASK_NBITS, 32)
 552
 553 /* layout of the struct passed from/to userland */
 554 struct ethtool_link_usettings {
 555         struct ethtool_link_settings base;
 556         struct {
 557                 __u32 supported[__ETHTOOL_LINK_MODE_MASK_NU32];
 558                 __u32 advertising[__ETHTOOL_LINK_MODE_MASK_NU32];
 559                 __u32 lp_advertising[__ETHTOOL_LINK_MODE_MASK_NU32];
 560         } link_modes;
 561 };
 562
 563 /* Internal kernel helper to query a device ethtool_link_settings.
 564  *
 565  * Backward compatibility note: for compatibility with legacy drivers
 566  * that implement only the ethtool_cmd API, this has to work with both
 567  * drivers implementing get_link_ksettings API and drivers
 568  * implementing get_settings API. When drivers implement get_settings
 569  * and report ethtool_cmd deprecated fields
 570  * (transceiver/maxrxpkt/maxtxpkt), these fields are silently ignored
 571  * because the resulting struct ethtool_link_settings does not report them.
 572  */
 573 int __ethtool_get_link_ksettings(struct net_device *dev,
 574                                  struct ethtool_link_ksettings *link_ksettings)
 575 {
 576         int err;
 577         struct ethtool_cmd cmd;
 578
 579         ASSERT_RTNL();
 580
 581         if (dev->ethtool_ops->get_link_ksettings) {
 582                 memset(link_ksettings, 0, sizeof(*link_ksettings));
 583                 return dev->ethtool_ops->get_link_ksettings(dev,
 584                                                             link_ksettings);
 585         }
 586
 587         /* driver doesn't support %ethtool_link_ksettings API. revert to
 588          * legacy %ethtool_cmd API, unless it's not supported either.
 589          * TODO: remove when ethtool_ops::get_settings disappears internally
 590          */
 591         if (!dev->ethtool_ops->get_settings)
 592                 return -EOPNOTSUPP;
 593
 594         memset(&cmd, 0, sizeof(cmd));
 595         cmd.cmd = ETHTOOL_GSET;
 596         err = dev->ethtool_ops->get_settings(dev, &cmd);
 597         if (err < 0)
 598                 return err;
 599
 600         /* we ignore deprecated fields transceiver/maxrxpkt/maxtxpkt
 601          */
 602         convert_legacy_settings_to_link_ksettings(link_ksettings, &cmd);
 603         return err;
 604 }
 605 EXPORT_SYMBOL(__ethtool_get_link_ksettings);
 606
 607 /* convert ethtool_link_usettings in user space to a kernel internal
 608  * ethtool_link_ksettings. return 0 on success, errno on error.
 609  */
 610 static int load_link_ksettings_from_user(struct ethtool_link_ksettings *to,
 611                                          const void __user *from)
 612 {
 613         struct ethtool_link_usettings link_usettings;
 614
 615         if (copy_from_user(&link_usettings, from, sizeof(link_usettings)))
 616                 return -EFAULT;
 617
 618         memcpy(&to->base, &link_usettings.base, sizeof(to->base));
 619         bitmap_from_arr32(to->link_modes.supported,
 620                           link_usettings.link_modes.supported,
 621                           __ETHTOOL_LINK_MODE_MASK_NBITS);
 622         bitmap_from_arr32(to->link_modes.advertising,
 623                           link_usettings.link_modes.advertising,
 624                           __ETHTOOL_LINK_MODE_MASK_NBITS);
 625         bitmap_from_arr32(to->link_modes.lp_advertising,
 626                           link_usettings.link_modes.lp_advertising,
 627                           __ETHTOOL_LINK_MODE_MASK_NBITS);
 628
 629         return 0;
 630 }
 631
 632 /* convert a kernel internal ethtool_link_ksettings to
 633  * ethtool_link_usettings in user space. return 0 on success, errno on
 634  * error.
 635  */
 636 static int
 637 store_link_ksettings_for_user(void __user *to,
 638                               const struct ethtool_link_ksettings *from)
 639 {
 640         struct ethtool_link_usettings link_usettings;
 641
 642         memcpy(&link_usettings.base, &from->base, sizeof(link_usettings));
 643         bitmap_to_arr32(link_usettings.link_modes.supported,
 644                         from->link_modes.supported,
 645                         __ETHTOOL_LINK_MODE_MASK_NBITS);
 646         bitmap_to_arr32(link_usettings.link_modes.advertising,
 647                         from->link_modes.advertising,
 648                         __ETHTOOL_LINK_MODE_MASK_NBITS);
 649         bitmap_to_arr32(link_usettings.link_modes.lp_advertising,
 650                         from->link_modes.lp_advertising,
 651                         __ETHTOOL_LINK_MODE_MASK_NBITS);
 652
 653         if (copy_to_user(to, &link_usettings, sizeof(link_usettings)))
 654                 return -EFAULT;
 655
 656         return 0;
 657 }
 658
 659 /* Query device for its ethtool_link_settings.
 660  *
 661  * Backward compatibility note: this function must fail when driver
 662  * does not implement ethtool::get_link_ksettings, even if legacy
 663  * ethtool_ops::get_settings is implemented. This tells new versions
 664  * of ethtool that they should use the legacy API %ETHTOOL_GSET for
 665  * this driver, so that they can correctly access the ethtool_cmd
 666  * deprecated fields (transceiver/maxrxpkt/maxtxpkt), until no driver
 667  * implements ethtool_ops::get_settings anymore.
 668  */
 669 static int ethtool_get_link_ksettings(struct net_device *dev,
 670                                       void __user *useraddr)
 671 {
 672         int err = 0;
 673         struct ethtool_link_ksettings link_ksettings;
 674
 675         ASSERT_RTNL();
 676
 677         if (!dev->ethtool_ops->get_link_ksettings)
 678                 return -EOPNOTSUPP;
 679
 680         /* handle bitmap nbits handshake */
 681         if (copy_from_user(&link_ksettings.base, useraddr,
 682                            sizeof(link_ksettings.base)))
 683                 return -EFAULT;
 684
 685         if (__ETHTOOL_LINK_MODE_MASK_NU32
 686             != link_ksettings.base.link_mode_masks_nwords) {
 687                 /* wrong link mode nbits requested */
 688                 memset(&link_ksettings, 0, sizeof(link_ksettings));
 689                 link_ksettings.base.cmd = ETHTOOL_GLINKSETTINGS;
 690                 /* send back number of words required as negative val */
 691                 compiletime_assert(__ETHTOOL_LINK_MODE_MASK_NU32 <= S8_MAX,
 692                                    "need too many bits for link modes!");
 693                 link_ksettings.base.link_mode_masks_nwords
 694                         = -((s8)__ETHTOOL_LINK_MODE_MASK_NU32);
 695
 696                 /* copy the base fields back to user, not the link
 697                  * mode bitmaps
 698                  */
 699                 if (copy_to_user(useraddr, &link_ksettings.base,
 700                                  sizeof(link_ksettings.base)))
 701                         return -EFAULT;
 702
 703                 return 0;
 704         }
 705
 706         /* handshake successful: user/kernel agree on
 707          * link_mode_masks_nwords
 708          */
 709
 710         memset(&link_ksettings, 0, sizeof(link_ksettings));
 711         err = dev->ethtool_ops->get_link_ksettings(dev, &link_ksettings);
 712         if (err < 0)
 713                 return err;
 714
 715         /* make sure we tell the right values to user */
 716         link_ksettings.base.cmd = ETHTOOL_GLINKSETTINGS;
 717         link_ksettings.base.link_mode_masks_nwords
 718                 = __ETHTOOL_LINK_MODE_MASK_NU32;
 719
 720         return store_link_ksettings_for_user(useraddr, &link_ksettings);
 721 }
 722
 723 /* Update device ethtool_link_settings.
 724  *
 725  * Backward compatibility note: this function must fail when driver
 726  * does not implement ethtool::set_link_ksettings, even if legacy
 727  * ethtool_ops::set_settings is implemented. This tells new versions
 728  * of ethtool that they should use the legacy API %ETHTOOL_SSET for
 729  * this driver, so that they can correctly update the ethtool_cmd
 730  * deprecated fields (transceiver/maxrxpkt/maxtxpkt), until no driver
 731  * implements ethtool_ops::get_settings anymore.
 732  */
 733 static int ethtool_set_link_ksettings(struct net_device *dev,
 734                                       void __user *useraddr)
 735 {
 736         int err;
 737         struct ethtool_link_ksettings link_ksettings;
 738
 739         ASSERT_RTNL();
 740
 741         if (!dev->ethtool_ops->set_link_ksettings)
 742                 return -EOPNOTSUPP;
 743
 744         /* make sure nbits field has expected value */
 745         if (copy_from_user(&link_ksettings.base, useraddr,
 746                            sizeof(link_ksettings.base)))
 747                 return -EFAULT;
 748
 749         if (__ETHTOOL_LINK_MODE_MASK_NU32
 750             != link_ksettings.base.link_mode_masks_nwords)
 751                 return -EINVAL;
 752
 753         /* copy the whole structure, now that we know it has expected
 754          * format
 755          */
 756         err = load_link_ksettings_from_user(&link_ksettings, useraddr);
 757         if (err)
 758                 return err;
 759
 760         /* re-check nwords field, just in case */
 761         if (__ETHTOOL_LINK_MODE_MASK_NU32
 762             != link_ksettings.base.link_mode_masks_nwords)
 763                 return -EINVAL;
 764
 765         return dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings);
 766 }
 767
 768 /* Query device for its ethtool_cmd settings.
 769  *
 770  * Backward compatibility note: for compatibility with legacy ethtool,
 771  * this has to work with both drivers implementing get_link_ksettings
 772  * API and drivers implementing get_settings API. When drivers
 773  * implement get_link_ksettings and report higher link mode bits, a
 774  * kernel warning is logged once (with name of 1st driver/device) to
 775  * recommend user to upgrade ethtool, but the command is successful
 776  * (only the lower link mode bits reported back to user).
 777  */
 778 static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
 779 {
 780         struct ethtool_cmd cmd;
 781
 782         ASSERT_RTNL();
 783
 784         if (dev->ethtool_ops->get_link_ksettings) {
 785                 /* First, use link_ksettings API if it is supported */
 786                 int err;
 787                 struct ethtool_link_ksettings link_ksettings;
 788
 789                 memset(&link_ksettings, 0, sizeof(link_ksettings));
 790                 err = dev->ethtool_ops->get_link_ksettings(dev,
 791                                                            &link_ksettings);
 792                 if (err < 0)
 793                         return err;
 794                 convert_link_ksettings_to_legacy_settings(&cmd,
 795                                                           &link_ksettings);
 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, max = { .cmd = ETHTOOL_GRINGPARAM };
1691
1692         if (!dev->ethtool_ops->set_ringparam || !dev->ethtool_ops->get_ringparam)
1693                 return -EOPNOTSUPP;
1694
1695         if (copy_from_user(&ringparam, useraddr, sizeof(ringparam)))
1696                 return -EFAULT;
1697
1698         dev->ethtool_ops->get_ringparam(dev, &max);
1699
1700         /* ensure new ring parameters are within the maximums */
1701         if (ringparam.rx_pending > max.rx_max_pending ||
1702             ringparam.rx_mini_pending > max.rx_mini_max_pending ||
1703             ringparam.rx_jumbo_pending > max.rx_jumbo_max_pending ||
1704             ringparam.tx_pending > max.tx_max_pending)
1705                 return -EINVAL;
1706
1707         return dev->ethtool_ops->set_ringparam(dev, &ringparam);
1708 }
1709
1710 static noinline_for_stack int ethtool_get_channels(struct net_device *dev,
1711                                                    void __user *useraddr)
1712 {
1713         struct ethtool_channels channels = { .cmd = ETHTOOL_GCHANNELS };
1714
1715         if (!dev->ethtool_ops->get_channels)
1716                 return -EOPNOTSUPP;
1717
1718         dev->ethtool_ops->get_channels(dev, &channels);
1719
1720         if (copy_to_user(useraddr, &channels, sizeof(channels)))
1721                 return -EFAULT;
1722         return 0;
1723 }
1724
1725 static noinline_for_stack int ethtool_set_channels(struct net_device *dev,
1726                                                    void __user *useraddr)
1727 {
1728         struct ethtool_channels channels, max = { .cmd = ETHTOOL_GCHANNELS };
1729         u32 max_rx_in_use = 0;
1730
1731         if (!dev->ethtool_ops->set_channels || !dev->ethtool_ops->get_channels)
1732                 return -EOPNOTSUPP;
1733
1734         if (copy_from_user(&channels, useraddr, sizeof(channels)))
1735                 return -EFAULT;
1736
1737         dev->ethtool_ops->get_channels(dev, &max);
1738
1739         /* ensure new counts are within the maximums */
1740         if ((channels.rx_count > max.max_rx) ||
1741             (channels.tx_count > max.max_tx) ||
1742             (channels.combined_count > max.max_combined) ||
1743             (channels.other_count > max.max_other))
1744                 return -EINVAL;
1745
1746         /* ensure the new Rx count fits within the configured Rx flow
1747          * indirection table settings */
1748         if (netif_is_rxfh_configured(dev) &&
1749             !ethtool_get_max_rxfh_channel(dev, &max_rx_in_use) &&
1750             (channels.combined_count + channels.rx_count) <= max_rx_in_use)
1751             return -EINVAL;
1752
1753         return dev->ethtool_ops->set_channels(dev, &channels);
1754 }
1755
1756 static int ethtool_get_pauseparam(struct net_device *dev, void __user *useraddr)
1757 {
1758         struct ethtool_pauseparam pauseparam = { ETHTOOL_GPAUSEPARAM };
1759
1760         if (!dev->ethtool_ops->get_pauseparam)
1761                 return -EOPNOTSUPP;
1762
1763         dev->ethtool_ops->get_pauseparam(dev, &pauseparam);
1764
1765         if (copy_to_user(useraddr, &pauseparam, sizeof(pauseparam)))
1766                 return -EFAULT;
1767         return 0;
1768 }
1769
1770 static int ethtool_set_pauseparam(struct net_device *dev, void __user *useraddr)
1771 {
1772         struct ethtool_pauseparam pauseparam;
1773
1774         if (!dev->ethtool_ops->set_pauseparam)
1775                 return -EOPNOTSUPP;
1776
1777         if (copy_from_user(&pauseparam, useraddr, sizeof(pauseparam)))
1778                 return -EFAULT;
1779
1780         return dev->ethtool_ops->set_pauseparam(dev, &pauseparam);
1781 }
1782
1783 static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
1784 {
1785         struct ethtool_test test;
1786         const struct ethtool_ops *ops = dev->ethtool_ops;
1787         u64 *data;
1788         int ret, test_len;
1789
1790         if (!ops->self_test || !ops->get_sset_count)
1791                 return -EOPNOTSUPP;
1792
1793         test_len = ops->get_sset_count(dev, ETH_SS_TEST);
1794         if (test_len < 0)
1795                 return test_len;
1796         WARN_ON(test_len == 0);
1797
1798         if (copy_from_user(&test, useraddr, sizeof(test)))
1799                 return -EFAULT;
1800
1801         test.len = test_len;
1802         data = kmalloc(test_len * sizeof(u64), GFP_USER);
1803         if (!data)
1804                 return -ENOMEM;
1805
1806         ops->self_test(dev, &test, data);
1807
1808         ret = -EFAULT;
1809         if (copy_to_user(useraddr, &test, sizeof(test)))
1810                 goto out;
1811         useraddr += sizeof(test);
1812         if (copy_to_user(useraddr, data, test.len * sizeof(u64)))
1813                 goto out;
1814         ret = 0;
1815
1816  out:
1817         kfree(data);
1818         return ret;
1819 }
1820
1821 static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
1822 {
1823         struct ethtool_gstrings gstrings;
1824         u8 *data;
1825         int ret;
1826
1827         if (copy_from_user(&gstrings, useraddr, sizeof(gstrings)))
1828                 return -EFAULT;
1829
1830         ret = __ethtool_get_sset_count(dev, gstrings.string_set);
1831         if (ret < 0)
1832                 return ret;
1833         if (ret > S32_MAX / ETH_GSTRING_LEN)
1834                 return -ENOMEM;
1835         WARN_ON_ONCE(!ret);
1836
1837         gstrings.len = ret;
1838         data = vzalloc(gstrings.len * ETH_GSTRING_LEN);
1839         if (gstrings.len && !data)
1840                 return -ENOMEM;
1841
1842         __ethtool_get_strings(dev, gstrings.string_set, data);
1843
1844         ret = -EFAULT;
1845         if (copy_to_user(useraddr, &gstrings, sizeof(gstrings)))
1846                 goto out;
1847         useraddr += sizeof(gstrings);
1848         if (gstrings.len &&
1849             copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))
1850                 goto out;
1851         ret = 0;
1852
1853 out:
1854         vfree(data);
1855         return ret;
1856 }
1857
1858 static int ethtool_phys_id(struct net_device *dev, void __user *useraddr)
1859 {
1860         struct ethtool_value id;
1861         static bool busy;
1862         const struct ethtool_ops *ops = dev->ethtool_ops;
1863         int rc;
1864
1865         if (!ops->set_phys_id)
1866                 return -EOPNOTSUPP;
1867
1868         if (busy)
1869                 return -EBUSY;
1870
1871         if (copy_from_user(&id, useraddr, sizeof(id)))
1872                 return -EFAULT;
1873
1874         rc = ops->set_phys_id(dev, ETHTOOL_ID_ACTIVE);
1875         if (rc < 0)
1876                 return rc;
1877
1878         /* Drop the RTNL lock while waiting, but prevent reentry or
1879          * removal of the device.
1880          */
1881         busy = true;
1882         dev_hold(dev);
1883         rtnl_unlock();
1884
1885         if (rc == 0) {
1886                 /* Driver will handle this itself */
1887                 schedule_timeout_interruptible(
1888                         id.data ? (id.data * HZ) : MAX_SCHEDULE_TIMEOUT);
1889         } else {
1890                 /* Driver expects to be called at twice the frequency in rc */
1891                 int n = rc * 2, i, interval = HZ / n;
1892
1893                 /* Count down seconds */
1894                 do {
1895                         /* Count down iterations per second */
1896                         i = n;
1897                         do {
1898                                 rtnl_lock();
1899                                 rc = ops->set_phys_id(dev,
1900                                     (i & 1) ? ETHTOOL_ID_OFF : ETHTOOL_ID_ON);
1901                                 rtnl_unlock();
1902                                 if (rc)
1903                                         break;
1904                                 schedule_timeout_interruptible(interval);
1905                         } while (!signal_pending(current) && --i != 0);
1906                 } while (!signal_pending(current) &&
1907                          (id.data == 0 || --id.data != 0));
1908         }
1909
1910         rtnl_lock();
1911         dev_put(dev);
1912         busy = false;
1913
1914         (void) ops->set_phys_id(dev, ETHTOOL_ID_INACTIVE);
1915         return rc;
1916 }
1917
1918 static int ethtool_get_stats(struct net_device *dev, void __user *useraddr)
1919 {
1920         struct ethtool_stats stats;
1921         const struct ethtool_ops *ops = dev->ethtool_ops;
1922         u64 *data;
1923         int ret, n_stats;
1924
1925         if (!ops->get_ethtool_stats || !ops->get_sset_count)
1926                 return -EOPNOTSUPP;
1927
1928         n_stats = ops->get_sset_count(dev, ETH_SS_STATS);
1929         if (n_stats < 0)
1930                 return n_stats;
1931         if (n_stats > S32_MAX / sizeof(u64))
1932                 return -ENOMEM;
1933         WARN_ON_ONCE(!n_stats);
1934         if (copy_from_user(&stats, useraddr, sizeof(stats)))
1935                 return -EFAULT;
1936
1937         stats.n_stats = n_stats;
1938         data = vzalloc(n_stats * sizeof(u64));
1939         if (n_stats && !data)
1940                 return -ENOMEM;
1941
1942         ops->get_ethtool_stats(dev, &stats, data);
1943
1944         ret = -EFAULT;
1945         if (copy_to_user(useraddr, &stats, sizeof(stats)))
1946                 goto out;
1947         useraddr += sizeof(stats);
1948         if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
1949                 goto out;
1950         ret = 0;
1951
1952  out:
1953         vfree(data);
1954         return ret;
1955 }
1956
1957 static int ethtool_get_phy_stats(struct net_device *dev, void __user *useraddr)
1958 {
1959         struct ethtool_stats stats;
1960         struct phy_device *phydev = dev->phydev;
1961         u64 *data;
1962         int ret, n_stats;
1963
1964         if (!phydev)
1965                 return -EOPNOTSUPP;
1966
1967         n_stats = phy_get_sset_count(phydev);
1968         if (n_stats < 0)
1969                 return n_stats;
1970         if (n_stats > S32_MAX / sizeof(u64))
1971                 return -ENOMEM;
1972         WARN_ON_ONCE(!n_stats);
1973
1974         if (copy_from_user(&stats, useraddr, sizeof(stats)))
1975                 return -EFAULT;
1976
1977         stats.n_stats = n_stats;
1978         data = vzalloc(n_stats * sizeof(u64));
1979         if (n_stats && !data)
1980                 return -ENOMEM;
1981
1982         mutex_lock(&phydev->lock);
1983         phydev->drv->get_stats(phydev, &stats, data);
1984         mutex_unlock(&phydev->lock);
1985
1986         ret = -EFAULT;
1987         if (copy_to_user(useraddr, &stats, sizeof(stats)))
1988                 goto out;
1989         useraddr += sizeof(stats);
1990         if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
1991                 goto out;
1992         ret = 0;
1993
1994  out:
1995         vfree(data);
1996         return ret;
1997 }
1998
1999 static int ethtool_get_perm_addr(struct net_device *dev, void __user *useraddr)
2000 {
2001         struct ethtool_perm_addr epaddr;
2002
2003         if (copy_from_user(&epaddr, useraddr, sizeof(epaddr)))
2004                 return -EFAULT;
2005
2006         if (epaddr.size < dev->addr_len)
2007                 return -ETOOSMALL;
2008         epaddr.size = dev->addr_len;
2009
2010         if (copy_to_user(useraddr, &epaddr, sizeof(epaddr)))
2011                 return -EFAULT;
2012         useraddr += sizeof(epaddr);
2013         if (copy_to_user(useraddr, dev->perm_addr, epaddr.size))
2014                 return -EFAULT;
2015         return 0;
2016 }
2017
2018 static int ethtool_get_value(struct net_device *dev, char __user *useraddr,
2019                              u32 cmd, u32 (*actor)(struct net_device *))
2020 {
2021         struct ethtool_value edata = { .cmd = cmd };
2022
2023         if (!actor)
2024                 return -EOPNOTSUPP;
2025
2026         edata.data = actor(dev);
2027
2028         if (copy_to_user(useraddr, &edata, sizeof(edata)))
2029                 return -EFAULT;
2030         return 0;
2031 }
2032
2033 static int ethtool_set_value_void(struct net_device *dev, char __user *useraddr,
2034                              void (*actor)(struct net_device *, u32))
2035 {
2036         struct ethtool_value edata;
2037
2038         if (!actor)
2039                 return -EOPNOTSUPP;
2040
2041         if (copy_from_user(&edata, useraddr, sizeof(edata)))
2042                 return -EFAULT;
2043
2044         actor(dev, edata.data);
2045         return 0;
2046 }
2047
2048 static int ethtool_set_value(struct net_device *dev, char __user *useraddr,
2049                              int (*actor)(struct net_device *, u32))
2050 {
2051         struct ethtool_value edata;
2052
2053         if (!actor)
2054                 return -EOPNOTSUPP;
2055
2056         if (copy_from_user(&edata, useraddr, sizeof(edata)))
2057                 return -EFAULT;
2058
2059         return actor(dev, edata.data);
2060 }
2061
2062 static noinline_for_stack int ethtool_flash_device(struct net_device *dev,
2063                                                    char __user *useraddr)
2064 {
2065         struct ethtool_flash efl;
2066
2067         if (copy_from_user(&efl, useraddr, sizeof(efl)))
2068                 return -EFAULT;
2069
2070         if (!dev->ethtool_ops->flash_device)
2071                 return -EOPNOTSUPP;
2072
2073         efl.data[ETHTOOL_FLASH_MAX_FILENAME - 1] = 0;
2074
2075         return dev->ethtool_ops->flash_device(dev, &efl);
2076 }
2077
2078 static int ethtool_set_dump(struct net_device *dev,
2079                         void __user *useraddr)
2080 {
2081         struct ethtool_dump dump;
2082
2083         if (!dev->ethtool_ops->set_dump)
2084                 return -EOPNOTSUPP;
2085
2086         if (copy_from_user(&dump, useraddr, sizeof(dump)))
2087                 return -EFAULT;
2088
2089         return dev->ethtool_ops->set_dump(dev, &dump);
2090 }
2091
2092 static int ethtool_get_dump_flag(struct net_device *dev,
2093                                 void __user *useraddr)
2094 {
2095         int ret;
2096         struct ethtool_dump dump;
2097         const struct ethtool_ops *ops = dev->ethtool_ops;
2098
2099         if (!ops->get_dump_flag)
2100                 return -EOPNOTSUPP;
2101
2102         if (copy_from_user(&dump, useraddr, sizeof(dump)))
2103                 return -EFAULT;
2104
2105         ret = ops->get_dump_flag(dev, &dump);
2106         if (ret)
2107                 return ret;
2108
2109         if (copy_to_user(useraddr, &dump, sizeof(dump)))
2110                 return -EFAULT;
2111         return 0;
2112 }
2113
2114 static int ethtool_get_dump_data(struct net_device *dev,
2115                                 void __user *useraddr)
2116 {
2117         int ret;
2118         __u32 len;
2119         struct ethtool_dump dump, tmp;
2120         const struct ethtool_ops *ops = dev->ethtool_ops;
2121         void *data = NULL;
2122
2123         if (!ops->get_dump_data || !ops->get_dump_flag)
2124                 return -EOPNOTSUPP;
2125
2126         if (copy_from_user(&dump, useraddr, sizeof(dump)))
2127                 return -EFAULT;
2128
2129         memset(&tmp, 0, sizeof(tmp));
2130         tmp.cmd = ETHTOOL_GET_DUMP_FLAG;
2131         ret = ops->get_dump_flag(dev, &tmp);
2132         if (ret)
2133                 return ret;
2134
2135         len = min(tmp.len, dump.len);
2136         if (!len)
2137                 return -EFAULT;
2138
2139         /* Don't ever let the driver think there's more space available
2140          * than it requested with .get_dump_flag().
2141          */
2142         dump.len = len;
2143
2144         /* Always allocate enough space to hold the whole thing so that the
2145          * driver does not need to check the length and bother with partial
2146          * dumping.
2147          */
2148         data = vzalloc(tmp.len);
2149         if (!data)
2150                 return -ENOMEM;
2151         ret = ops->get_dump_data(dev, &dump, data);
2152         if (ret)
2153                 goto out;
2154
2155         /* There are two sane possibilities:
2156          * 1. The driver's .get_dump_data() does not touch dump.len.
2157          * 2. Or it may set dump.len to how much it really writes, which
2158          *    should be tmp.len (or len if it can do a partial dump).
2159          * In any case respond to userspace with the actual length of data
2160          * it's receiving.
2161          */
2162         WARN_ON(dump.len != len && dump.len != tmp.len);
2163         dump.len = len;
2164
2165         if (copy_to_user(useraddr, &dump, sizeof(dump))) {
2166                 ret = -EFAULT;
2167                 goto out;
2168         }
2169         useraddr += offsetof(struct ethtool_dump, data);
2170         if (copy_to_user(useraddr, data, len))
2171                 ret = -EFAULT;
2172 out:
2173         vfree(data);
2174         return ret;
2175 }
2176
2177 static int ethtool_get_ts_info(struct net_device *dev, void __user *useraddr)
2178 {
2179         int err = 0;
2180         struct ethtool_ts_info info;
2181         const struct ethtool_ops *ops = dev->ethtool_ops;
2182         struct phy_device *phydev = dev->phydev;
2183
2184         memset(&info, 0, sizeof(info));
2185         info.cmd = ETHTOOL_GET_TS_INFO;
2186
2187         if (phydev && phydev->drv && phydev->drv->ts_info) {
2188                 err = phydev->drv->ts_info(phydev, &info);
2189         } else if (ops->get_ts_info) {
2190                 err = ops->get_ts_info(dev, &info);
2191         } else {
2192                 info.so_timestamping =
2193                         SOF_TIMESTAMPING_RX_SOFTWARE |
2194                         SOF_TIMESTAMPING_SOFTWARE;
2195                 info.phc_index = -1;
2196         }
2197
2198         if (err)
2199                 return err;
2200
2201         if (copy_to_user(useraddr, &info, sizeof(info)))
2202                 err = -EFAULT;
2203
2204         return err;
2205 }
2206
2207 static int __ethtool_get_module_info(struct net_device *dev,
2208                                      struct ethtool_modinfo *modinfo)
2209 {
2210         const struct ethtool_ops *ops = dev->ethtool_ops;
2211         struct phy_device *phydev = dev->phydev;
2212
2213         if (phydev && phydev->drv && phydev->drv->module_info)
2214                 return phydev->drv->module_info(phydev, modinfo);
2215
2216         if (ops->get_module_info)
2217                 return ops->get_module_info(dev, modinfo);
2218
2219         return -EOPNOTSUPP;
2220 }
2221
2222 static int ethtool_get_module_info(struct net_device *dev,
2223                                    void __user *useraddr)
2224 {
2225         int ret;
2226         struct ethtool_modinfo modinfo;
2227
2228         if (copy_from_user(&modinfo, useraddr, sizeof(modinfo)))
2229                 return -EFAULT;
2230
2231         ret = __ethtool_get_module_info(dev, &modinfo);
2232         if (ret)
2233                 return ret;
2234
2235         if (copy_to_user(useraddr, &modinfo, sizeof(modinfo)))
2236                 return -EFAULT;
2237
2238         return 0;
2239 }
2240
2241 static int __ethtool_get_module_eeprom(struct net_device *dev,
2242                                        struct ethtool_eeprom *ee, u8 *data)
2243 {
2244         const struct ethtool_ops *ops = dev->ethtool_ops;
2245         struct phy_device *phydev = dev->phydev;
2246
2247         if (phydev && phydev->drv && phydev->drv->module_eeprom)
2248                 return phydev->drv->module_eeprom(phydev, ee, data);
2249
2250         if (ops->get_module_eeprom)
2251                 return ops->get_module_eeprom(dev, ee, data);
2252
2253         return -EOPNOTSUPP;
2254 }
2255
2256 static int ethtool_get_module_eeprom(struct net_device *dev,
2257                                      void __user *useraddr)
2258 {
2259         int ret;
2260         struct ethtool_modinfo modinfo;
2261
2262         ret = __ethtool_get_module_info(dev, &modinfo);
2263         if (ret)
2264                 return ret;
2265
2266         return ethtool_get_any_eeprom(dev, useraddr,
2267                                       __ethtool_get_module_eeprom,
2268                                       modinfo.eeprom_len);
2269 }
2270
2271 static int ethtool_tunable_valid(const struct ethtool_tunable *tuna)
2272 {
2273         switch (tuna->id) {
2274         case ETHTOOL_RX_COPYBREAK:
2275         case ETHTOOL_TX_COPYBREAK:
2276                 if (tuna->len != sizeof(u32) ||
2277                     tuna->type_id != ETHTOOL_TUNABLE_U32)
2278                         return -EINVAL;
2279                 break;
2280         default:
2281                 return -EINVAL;
2282         }
2283
2284         return 0;
2285 }
2286
2287 static int ethtool_get_tunable(struct net_device *dev, void __user *useraddr)
2288 {
2289         int ret;
2290         struct ethtool_tunable tuna;
2291         const struct ethtool_ops *ops = dev->ethtool_ops;
2292         void *data;
2293
2294         if (!ops->get_tunable)
2295                 return -EOPNOTSUPP;
2296         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2297                 return -EFAULT;
2298         ret = ethtool_tunable_valid(&tuna);
2299         if (ret)
2300                 return ret;
2301         data = kmalloc(tuna.len, GFP_USER);
2302         if (!data)
2303                 return -ENOMEM;
2304         ret = ops->get_tunable(dev, &tuna, data);
2305         if (ret)
2306                 goto out;
2307         useraddr += sizeof(tuna);
2308         ret = -EFAULT;
2309         if (copy_to_user(useraddr, data, tuna.len))
2310                 goto out;
2311         ret = 0;
2312
2313 out:
2314         kfree(data);
2315         return ret;
2316 }
2317
2318 static int ethtool_set_tunable(struct net_device *dev, void __user *useraddr)
2319 {
2320         int ret;
2321         struct ethtool_tunable tuna;
2322         const struct ethtool_ops *ops = dev->ethtool_ops;
2323         void *data;
2324
2325         if (!ops->set_tunable)
2326                 return -EOPNOTSUPP;
2327         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2328                 return -EFAULT;
2329         ret = ethtool_tunable_valid(&tuna);
2330         if (ret)
2331                 return ret;
2332         useraddr += sizeof(tuna);
2333         data = memdup_user(useraddr, tuna.len);
2334         if (IS_ERR(data))
2335                 return PTR_ERR(data);
2336         ret = ops->set_tunable(dev, &tuna, data);
2337
2338         kfree(data);
2339         return ret;
2340 }
2341
2342 static int ethtool_get_per_queue_coalesce(struct net_device *dev,
2343                                           void __user *useraddr,
2344                                           struct ethtool_per_queue_op *per_queue_opt)
2345 {
2346         u32 bit;
2347         int ret;
2348         DECLARE_BITMAP(queue_mask, MAX_NUM_QUEUE);
2349
2350         if (!dev->ethtool_ops->get_per_queue_coalesce)
2351                 return -EOPNOTSUPP;
2352
2353         useraddr += sizeof(*per_queue_opt);
2354
2355         bitmap_from_arr32(queue_mask, per_queue_opt->queue_mask,
2356                           MAX_NUM_QUEUE);
2357
2358         for_each_set_bit(bit, queue_mask, MAX_NUM_QUEUE) {
2359                 struct ethtool_coalesce coalesce = { .cmd = ETHTOOL_GCOALESCE };
2360
2361                 ret = dev->ethtool_ops->get_per_queue_coalesce(dev, bit, &coalesce);
2362                 if (ret != 0)
2363                         return ret;
2364                 if (copy_to_user(useraddr, &coalesce, sizeof(coalesce)))
2365                         return -EFAULT;
2366                 useraddr += sizeof(coalesce);
2367         }
2368
2369         return 0;
2370 }
2371
2372 static int ethtool_set_per_queue_coalesce(struct net_device *dev,
2373                                           void __user *useraddr,
2374                                           struct ethtool_per_queue_op *per_queue_opt)
2375 {
2376         u32 bit;
2377         int i, ret = 0;
2378         int n_queue;
2379         struct ethtool_coalesce *backup = NULL, *tmp = NULL;
2380         DECLARE_BITMAP(queue_mask, MAX_NUM_QUEUE);
2381
2382         if ((!dev->ethtool_ops->set_per_queue_coalesce) ||
2383             (!dev->ethtool_ops->get_per_queue_coalesce))
2384                 return -EOPNOTSUPP;
2385
2386         useraddr += sizeof(*per_queue_opt);
2387
2388         bitmap_from_arr32(queue_mask, per_queue_opt->queue_mask, MAX_NUM_QUEUE);
2389         n_queue = bitmap_weight(queue_mask, MAX_NUM_QUEUE);
2390         tmp = backup = kmalloc_array(n_queue, sizeof(*backup), GFP_KERNEL);
2391         if (!backup)
2392                 return -ENOMEM;
2393
2394         for_each_set_bit(bit, queue_mask, MAX_NUM_QUEUE) {
2395                 struct ethtool_coalesce coalesce;
2396
2397                 ret = dev->ethtool_ops->get_per_queue_coalesce(dev, bit, tmp);
2398                 if (ret != 0)
2399                         goto roll_back;
2400
2401                 tmp++;
2402
2403                 if (copy_from_user(&coalesce, useraddr, sizeof(coalesce))) {
2404                         ret = -EFAULT;
2405                         goto roll_back;
2406                 }
2407
2408                 ret = dev->ethtool_ops->set_per_queue_coalesce(dev, bit, &coalesce);
2409                 if (ret != 0)
2410                         goto roll_back;
2411
2412                 useraddr += sizeof(coalesce);
2413         }
2414
2415 roll_back:
2416         if (ret != 0) {
2417                 tmp = backup;
2418                 for_each_set_bit(i, queue_mask, bit) {
2419                         dev->ethtool_ops->set_per_queue_coalesce(dev, i, tmp);
2420                         tmp++;
2421                 }
2422         }
2423         kfree(backup);
2424
2425         return ret;
2426 }
2427
2428 static int ethtool_set_per_queue(struct net_device *dev, void __user *useraddr)
2429 {
2430         struct ethtool_per_queue_op per_queue_opt;
2431
2432         if (copy_from_user(&per_queue_opt, useraddr, sizeof(per_queue_opt)))
2433                 return -EFAULT;
2434
2435         switch (per_queue_opt.sub_command) {
2436         case ETHTOOL_GCOALESCE:
2437                 return ethtool_get_per_queue_coalesce(dev, useraddr, &per_queue_opt);
2438         case ETHTOOL_SCOALESCE:
2439                 return ethtool_set_per_queue_coalesce(dev, useraddr, &per_queue_opt);
2440         default:
2441                 return -EOPNOTSUPP;
2442         };
2443 }
2444
2445 static int ethtool_phy_tunable_valid(const struct ethtool_tunable *tuna)
2446 {
2447         switch (tuna->id) {
2448         case ETHTOOL_PHY_DOWNSHIFT:
2449                 if (tuna->len != sizeof(u8) ||
2450                     tuna->type_id != ETHTOOL_TUNABLE_U8)
2451                         return -EINVAL;
2452                 break;
2453         default:
2454                 return -EINVAL;
2455         }
2456
2457         return 0;
2458 }
2459
2460 static int get_phy_tunable(struct net_device *dev, void __user *useraddr)
2461 {
2462         int ret;
2463         struct ethtool_tunable tuna;
2464         struct phy_device *phydev = dev->phydev;
2465         void *data;
2466
2467         if (!(phydev && phydev->drv && phydev->drv->get_tunable))
2468                 return -EOPNOTSUPP;
2469
2470         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2471                 return -EFAULT;
2472         ret = ethtool_phy_tunable_valid(&tuna);
2473         if (ret)
2474                 return ret;
2475         data = kmalloc(tuna.len, GFP_USER);
2476         if (!data)
2477                 return -ENOMEM;
2478         mutex_lock(&phydev->lock);
2479         ret = phydev->drv->get_tunable(phydev, &tuna, data);
2480         mutex_unlock(&phydev->lock);
2481         if (ret)
2482                 goto out;
2483         useraddr += sizeof(tuna);
2484         ret = -EFAULT;
2485         if (copy_to_user(useraddr, data, tuna.len))
2486                 goto out;
2487         ret = 0;
2488
2489 out:
2490         kfree(data);
2491         return ret;
2492 }
2493
2494 static int set_phy_tunable(struct net_device *dev, void __user *useraddr)
2495 {
2496         int ret;
2497         struct ethtool_tunable tuna;
2498         struct phy_device *phydev = dev->phydev;
2499         void *data;
2500
2501         if (!(phydev && phydev->drv && phydev->drv->set_tunable))
2502                 return -EOPNOTSUPP;
2503         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2504                 return -EFAULT;
2505         ret = ethtool_phy_tunable_valid(&tuna);
2506         if (ret)
2507                 return ret;
2508         useraddr += sizeof(tuna);
2509         data = memdup_user(useraddr, tuna.len);
2510         if (IS_ERR(data))
2511                 return PTR_ERR(data);
2512         mutex_lock(&phydev->lock);
2513         ret = phydev->drv->set_tunable(phydev, &tuna, data);
2514         mutex_unlock(&phydev->lock);
2515
2516         kfree(data);
2517         return ret;
2518 }
2519
2520 static int ethtool_get_fecparam(struct net_device *dev, void __user *useraddr)
2521 {
2522         struct ethtool_fecparam fecparam = { ETHTOOL_GFECPARAM };
2523         int rc;
2524
2525         if (!dev->ethtool_ops->get_fecparam)
2526                 return -EOPNOTSUPP;
2527
2528         rc = dev->ethtool_ops->get_fecparam(dev, &fecparam);
2529         if (rc)
2530                 return rc;
2531
2532         if (copy_to_user(useraddr, &fecparam, sizeof(fecparam)))
2533                 return -EFAULT;
2534         return 0;
2535 }
2536
2537 static int ethtool_set_fecparam(struct net_device *dev, void __user *useraddr)
2538 {
2539         struct ethtool_fecparam fecparam;
2540
2541         if (!dev->ethtool_ops->set_fecparam)
2542                 return -EOPNOTSUPP;
2543
2544         if (copy_from_user(&fecparam, useraddr, sizeof(fecparam)))
2545                 return -EFAULT;
2546
2547         return dev->ethtool_ops->set_fecparam(dev, &fecparam);
2548 }
2549
2550 /* The main entry point in this file.  Called from net/core/dev_ioctl.c */
2551
2552 int dev_ethtool(struct net *net, struct ifreq *ifr)
2553 {
2554         struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
2555         void __user *useraddr = ifr->ifr_data;
2556         u32 ethcmd, sub_cmd;
2557         int rc;
2558         netdev_features_t old_features;
2559
2560         if (!dev || !netif_device_present(dev))
2561                 return -ENODEV;
2562
2563         if (copy_from_user(&ethcmd, useraddr, sizeof(ethcmd)))
2564                 return -EFAULT;
2565
2566         if (ethcmd == ETHTOOL_PERQUEUE) {
2567                 if (copy_from_user(&sub_cmd, useraddr + sizeof(ethcmd), sizeof(sub_cmd)))
2568                         return -EFAULT;
2569         } else {
2570                 sub_cmd = ethcmd;
2571         }
2572         /* Allow some commands to be done by anyone */
2573         switch (sub_cmd) {
2574         case ETHTOOL_GSET:
2575         case ETHTOOL_GDRVINFO:
2576         case ETHTOOL_GMSGLVL:
2577         case ETHTOOL_GLINK:
2578         case ETHTOOL_GCOALESCE:
2579         case ETHTOOL_GRINGPARAM:
2580         case ETHTOOL_GPAUSEPARAM:
2581         case ETHTOOL_GRXCSUM:
2582         case ETHTOOL_GTXCSUM:
2583         case ETHTOOL_GSG:
2584         case ETHTOOL_GSSET_INFO:
2585         case ETHTOOL_GSTRINGS:
2586         case ETHTOOL_GSTATS:
2587         case ETHTOOL_GPHYSTATS:
2588         case ETHTOOL_GTSO:
2589         case ETHTOOL_GPERMADDR:
2590         case ETHTOOL_GGSO:
2591         case ETHTOOL_GGRO:
2592         case ETHTOOL_GFLAGS:
2593         case ETHTOOL_GPFLAGS:
2594         case ETHTOOL_GRXFH:
2595         case ETHTOOL_GRXRINGS:
2596         case ETHTOOL_GRXCLSRLCNT:
2597         case ETHTOOL_GRXCLSRULE:
2598         case ETHTOOL_GRXCLSRLALL:
2599         case ETHTOOL_GRXFHINDIR:
2600         case ETHTOOL_GRSSH:
2601         case ETHTOOL_GFEATURES:
2602         case ETHTOOL_GCHANNELS:
2603         case ETHTOOL_GET_TS_INFO:
2604         case ETHTOOL_GEEE:
2605         case ETHTOOL_GTUNABLE:
2606         case ETHTOOL_PHY_GTUNABLE:
2607         case ETHTOOL_GLINKSETTINGS:
2608         case ETHTOOL_GFECPARAM:
2609                 break;
2610         default:
2611                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2612                         return -EPERM;
2613         }
2614
2615         if (dev->ethtool_ops->begin) {
2616                 rc = dev->ethtool_ops->begin(dev);
2617                 if (rc  < 0)
2618                         return rc;
2619         }
2620         old_features = dev->features;
2621
2622         switch (ethcmd) {
2623         case ETHTOOL_GSET:
2624                 rc = ethtool_get_settings(dev, useraddr);
2625                 break;
2626         case ETHTOOL_SSET:
2627                 rc = ethtool_set_settings(dev, useraddr);
2628                 break;
2629         case ETHTOOL_GDRVINFO:
2630                 rc = ethtool_get_drvinfo(dev, useraddr);
2631                 break;
2632         case ETHTOOL_GREGS:
2633                 rc = ethtool_get_regs(dev, useraddr);
2634                 break;
2635         case ETHTOOL_GWOL:
2636                 rc = ethtool_get_wol(dev, useraddr);
2637                 break;
2638         case ETHTOOL_SWOL:
2639                 rc = ethtool_set_wol(dev, useraddr);
2640                 break;
2641         case ETHTOOL_GMSGLVL:
2642                 rc = ethtool_get_value(dev, useraddr, ethcmd,
2643                                        dev->ethtool_ops->get_msglevel);
2644                 break;
2645         case ETHTOOL_SMSGLVL:
2646                 rc = ethtool_set_value_void(dev, useraddr,
2647                                        dev->ethtool_ops->set_msglevel);
2648                 break;
2649         case ETHTOOL_GEEE:
2650                 rc = ethtool_get_eee(dev, useraddr);
2651                 break;
2652         case ETHTOOL_SEEE:
2653                 rc = ethtool_set_eee(dev, useraddr);
2654                 break;
2655         case ETHTOOL_NWAY_RST:
2656                 rc = ethtool_nway_reset(dev);
2657                 break;
2658         case ETHTOOL_GLINK:
2659                 rc = ethtool_get_link(dev, useraddr);
2660                 break;
2661         case ETHTOOL_GEEPROM:
2662                 rc = ethtool_get_eeprom(dev, useraddr);
2663                 break;
2664         case ETHTOOL_SEEPROM:
2665                 rc = ethtool_set_eeprom(dev, useraddr);
2666                 break;
2667         case ETHTOOL_GCOALESCE:
2668                 rc = ethtool_get_coalesce(dev, useraddr);
2669                 break;
2670         case ETHTOOL_SCOALESCE:
2671                 rc = ethtool_set_coalesce(dev, useraddr);
2672                 break;
2673         case ETHTOOL_GRINGPARAM:
2674                 rc = ethtool_get_ringparam(dev, useraddr);
2675                 break;
2676         case ETHTOOL_SRINGPARAM:
2677                 rc = ethtool_set_ringparam(dev, useraddr);
2678                 break;
2679         case ETHTOOL_GPAUSEPARAM:
2680                 rc = ethtool_get_pauseparam(dev, useraddr);
2681                 break;
2682         case ETHTOOL_SPAUSEPARAM:
2683                 rc = ethtool_set_pauseparam(dev, useraddr);
2684                 break;
2685         case ETHTOOL_TEST:
2686                 rc = ethtool_self_test(dev, useraddr);
2687                 break;
2688         case ETHTOOL_GSTRINGS:
2689                 rc = ethtool_get_strings(dev, useraddr);
2690                 break;
2691         case ETHTOOL_PHYS_ID:
2692                 rc = ethtool_phys_id(dev, useraddr);
2693                 break;
2694         case ETHTOOL_GSTATS:
2695                 rc = ethtool_get_stats(dev, useraddr);
2696                 break;
2697         case ETHTOOL_GPERMADDR:
2698                 rc = ethtool_get_perm_addr(dev, useraddr);
2699                 break;
2700         case ETHTOOL_GFLAGS:
2701                 rc = ethtool_get_value(dev, useraddr, ethcmd,
2702                                         __ethtool_get_flags);
2703                 break;
2704         case ETHTOOL_SFLAGS:
2705                 rc = ethtool_set_value(dev, useraddr, __ethtool_set_flags);
2706                 break;
2707         case ETHTOOL_GPFLAGS:
2708                 rc = ethtool_get_value(dev, useraddr, ethcmd,
2709                                        dev->ethtool_ops->get_priv_flags);
2710                 break;
2711         case ETHTOOL_SPFLAGS:
2712                 rc = ethtool_set_value(dev, useraddr,
2713                                        dev->ethtool_ops->set_priv_flags);
2714                 break;
2715         case ETHTOOL_GRXFH:
2716         case ETHTOOL_GRXRINGS:
2717         case ETHTOOL_GRXCLSRLCNT:
2718         case ETHTOOL_GRXCLSRULE:
2719         case ETHTOOL_GRXCLSRLALL:
2720                 rc = ethtool_get_rxnfc(dev, ethcmd, useraddr);
2721                 break;
2722         case ETHTOOL_SRXFH:
2723         case ETHTOOL_SRXCLSRLDEL:
2724         case ETHTOOL_SRXCLSRLINS:
2725                 rc = ethtool_set_rxnfc(dev, ethcmd, useraddr);
2726                 break;
2727         case ETHTOOL_FLASHDEV:
2728                 rc = ethtool_flash_device(dev, useraddr);
2729                 break;
2730         case ETHTOOL_RESET:
2731                 rc = ethtool_reset(dev, useraddr);
2732                 break;
2733         case ETHTOOL_GSSET_INFO:
2734                 rc = ethtool_get_sset_info(dev, useraddr);
2735                 break;
2736         case ETHTOOL_GRXFHINDIR:
2737                 rc = ethtool_get_rxfh_indir(dev, useraddr);
2738                 break;
2739         case ETHTOOL_SRXFHINDIR:
2740                 rc = ethtool_set_rxfh_indir(dev, useraddr);
2741                 break;
2742         case ETHTOOL_GRSSH:
2743                 rc = ethtool_get_rxfh(dev, useraddr);
2744                 break;
2745         case ETHTOOL_SRSSH:
2746                 rc = ethtool_set_rxfh(dev, useraddr);
2747                 break;
2748         case ETHTOOL_GFEATURES:
2749                 rc = ethtool_get_features(dev, useraddr);
2750                 break;
2751         case ETHTOOL_SFEATURES:
2752                 rc = ethtool_set_features(dev, useraddr);
2753                 break;
2754         case ETHTOOL_GTXCSUM:
2755         case ETHTOOL_GRXCSUM:
2756         case ETHTOOL_GSG:
2757         case ETHTOOL_GTSO:
2758         case ETHTOOL_GGSO:
2759         case ETHTOOL_GGRO:
2760                 rc = ethtool_get_one_feature(dev, useraddr, ethcmd);
2761                 break;
2762         case ETHTOOL_STXCSUM:
2763         case ETHTOOL_SRXCSUM:
2764         case ETHTOOL_SSG:
2765         case ETHTOOL_STSO:
2766         case ETHTOOL_SGSO:
2767         case ETHTOOL_SGRO:
2768                 rc = ethtool_set_one_feature(dev, useraddr, ethcmd);
2769                 break;
2770         case ETHTOOL_GCHANNELS:
2771                 rc = ethtool_get_channels(dev, useraddr);
2772                 break;
2773         case ETHTOOL_SCHANNELS:
2774                 rc = ethtool_set_channels(dev, useraddr);
2775                 break;
2776         case ETHTOOL_SET_DUMP:
2777                 rc = ethtool_set_dump(dev, useraddr);
2778                 break;
2779         case ETHTOOL_GET_DUMP_FLAG:
2780                 rc = ethtool_get_dump_flag(dev, useraddr);
2781                 break;
2782         case ETHTOOL_GET_DUMP_DATA:
2783                 rc = ethtool_get_dump_data(dev, useraddr);
2784                 break;
2785         case ETHTOOL_GET_TS_INFO:
2786                 rc = ethtool_get_ts_info(dev, useraddr);
2787                 break;
2788         case ETHTOOL_GMODULEINFO:
2789                 rc = ethtool_get_module_info(dev, useraddr);
2790                 break;
2791         case ETHTOOL_GMODULEEEPROM:
2792                 rc = ethtool_get_module_eeprom(dev, useraddr);
2793                 break;
2794         case ETHTOOL_GTUNABLE:
2795                 rc = ethtool_get_tunable(dev, useraddr);
2796                 break;
2797         case ETHTOOL_STUNABLE:
2798                 rc = ethtool_set_tunable(dev, useraddr);
2799                 break;
2800         case ETHTOOL_GPHYSTATS:
2801                 rc = ethtool_get_phy_stats(dev, useraddr);
2802                 break;
2803         case ETHTOOL_PERQUEUE:
2804                 rc = ethtool_set_per_queue(dev, useraddr);
2805                 break;
2806         case ETHTOOL_GLINKSETTINGS:
2807                 rc = ethtool_get_link_ksettings(dev, useraddr);
2808                 break;
2809         case ETHTOOL_SLINKSETTINGS:
2810                 rc = ethtool_set_link_ksettings(dev, useraddr);
2811                 break;
2812         case ETHTOOL_PHY_GTUNABLE:
2813                 rc = get_phy_tunable(dev, useraddr);
2814                 break;
2815         case ETHTOOL_PHY_STUNABLE:
2816                 rc = set_phy_tunable(dev, useraddr);
2817                 break;
2818         case ETHTOOL_GFECPARAM:
2819                 rc = ethtool_get_fecparam(dev, useraddr);
2820                 break;
2821         case ETHTOOL_SFECPARAM:
2822                 rc = ethtool_set_fecparam(dev, useraddr);
2823                 break;
2824         default:
2825                 rc = -EOPNOTSUPP;
2826         }
2827
2828         if (dev->ethtool_ops->complete)
2829                 dev->ethtool_ops->complete(dev);
2830
2831         if (old_features != dev->features)
2832                 netdev_features_change(dev);
2833
2834         return rc;
2835 }