net/core/ethtool.c

   1 /*
   2  * net/core/ethtool.c - Ethtool ioctl handler
   3  * Copyright (c) 2003 Matthew Wilcox <[email protected]>
   4  *
   5  * This file is where we call all the ethtool_ops commands to get
   6  * the information ethtool needs.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/types.h>
  16 #include <linux/capability.h>
  17 #include <linux/errno.h>
  18 #include <linux/ethtool.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/net_tstamp.h>
  21 #include <linux/phy.h>
  22 #include <linux/bitops.h>
  23 #include <linux/uaccess.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/sfp.h>
  26 #include <linux/slab.h>
  27 #include <linux/rtnetlink.h>
  28 #include <linux/sched/signal.h>
  29 #include <linux/net.h>
  30
  31 /*
  32  * Some useful ethtool_ops methods that're device independent.
  33  * If we find that all drivers want to do the same thing here,
  34  * we can turn these into dev_() function calls.
  35  */
  36
  37 u32 ethtool_op_get_link(struct net_device *dev)
  38 {
  39         return netif_carrier_ok(dev) ? 1 : 0;
  40 }
  41 EXPORT_SYMBOL(ethtool_op_get_link);
  42
  43 int ethtool_op_get_ts_info(struct net_device *dev, struct ethtool_ts_info *info)
  44 {
  45         info->so_timestamping =
  46                 SOF_TIMESTAMPING_TX_SOFTWARE |
  47                 SOF_TIMESTAMPING_RX_SOFTWARE |
  48                 SOF_TIMESTAMPING_SOFTWARE;
  49         info->phc_index = -1;
  50         return 0;
  51 }
  52 EXPORT_SYMBOL(ethtool_op_get_ts_info);
  53
  54 /* Handlers for each ethtool command */
  55
  56 #define ETHTOOL_DEV_FEATURE_WORDS       ((NETDEV_FEATURE_COUNT + 31) / 32)
  57
  58 static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN] = {
  59         [NETIF_F_SG_BIT] =               "tx-scatter-gather",
  60         [NETIF_F_IP_CSUM_BIT] =          "tx-checksum-ipv4",
  61         [NETIF_F_HW_CSUM_BIT] =          "tx-checksum-ip-generic",
  62         [NETIF_F_IPV6_CSUM_BIT] =        "tx-checksum-ipv6",
  63         [NETIF_F_HIGHDMA_BIT] =          "highdma",
  64         [NETIF_F_FRAGLIST_BIT] =         "tx-scatter-gather-fraglist",
  65         [NETIF_F_HW_VLAN_CTAG_TX_BIT] =  "tx-vlan-hw-insert",
  66
  67         [NETIF_F_HW_VLAN_CTAG_RX_BIT] =  "rx-vlan-hw-parse",
  68         [NETIF_F_HW_VLAN_CTAG_FILTER_BIT] = "rx-vlan-filter",
  69         [NETIF_F_HW_VLAN_STAG_TX_BIT] =  "tx-vlan-stag-hw-insert",
  70         [NETIF_F_HW_VLAN_STAG_RX_BIT] =  "rx-vlan-stag-hw-parse",
  71         [NETIF_F_HW_VLAN_STAG_FILTER_BIT] = "rx-vlan-stag-filter",
  72         [NETIF_F_VLAN_CHALLENGED_BIT] =  "vlan-challenged",
  73         [NETIF_F_GSO_BIT] =              "tx-generic-segmentation",
  74         [NETIF_F_LLTX_BIT] =             "tx-lockless",
  75         [NETIF_F_NETNS_LOCAL_BIT] =      "netns-local",
  76         [NETIF_F_GRO_BIT] =              "rx-gro",
  77         [NETIF_F_GRO_HW_BIT] =           "rx-gro-hw",
  78         [NETIF_F_LRO_BIT] =              "rx-lro",
  79
  80         [NETIF_F_TSO_BIT] =              "tx-tcp-segmentation",
  81         [NETIF_F_GSO_ROBUST_BIT] =       "tx-gso-robust",
  82         [NETIF_F_TSO_ECN_BIT] =          "tx-tcp-ecn-segmentation",
  83         [NETIF_F_TSO_MANGLEID_BIT] =     "tx-tcp-mangleid-segmentation",
  84         [NETIF_F_TSO6_BIT] =             "tx-tcp6-segmentation",
  85         [NETIF_F_FSO_BIT] =              "tx-fcoe-segmentation",
  86         [NETIF_F_GSO_GRE_BIT] =          "tx-gre-segmentation",
  87         [NETIF_F_GSO_GRE_CSUM_BIT] =     "tx-gre-csum-segmentation",
  88         [NETIF_F_GSO_IPXIP4_BIT] =       "tx-ipxip4-segmentation",
  89         [NETIF_F_GSO_IPXIP6_BIT] =       "tx-ipxip6-segmentation",
  90         [NETIF_F_GSO_UDP_TUNNEL_BIT] =   "tx-udp_tnl-segmentation",
  91         [NETIF_F_GSO_UDP_TUNNEL_CSUM_BIT] = "tx-udp_tnl-csum-segmentation",
  92         [NETIF_F_GSO_PARTIAL_BIT] =      "tx-gso-partial",
  93         [NETIF_F_GSO_SCTP_BIT] =         "tx-sctp-segmentation",
  94         [NETIF_F_GSO_ESP_BIT] =          "tx-esp-segmentation",
  95         [NETIF_F_GSO_UDP_L4_BIT] =       "tx-udp-segmentation",
  96
  97         [NETIF_F_FCOE_CRC_BIT] =         "tx-checksum-fcoe-crc",
  98         [NETIF_F_SCTP_CRC_BIT] =        "tx-checksum-sctp",
  99         [NETIF_F_FCOE_MTU_BIT] =         "fcoe-mtu",
 100         [NETIF_F_NTUPLE_BIT] =           "rx-ntuple-filter",
 101         [NETIF_F_RXHASH_BIT] =           "rx-hashing",
 102         [NETIF_F_RXCSUM_BIT] =           "rx-checksum",
 103         [NETIF_F_NOCACHE_COPY_BIT] =     "tx-nocache-copy",
 104         [NETIF_F_LOOPBACK_BIT] =         "loopback",
 105         [NETIF_F_RXFCS_BIT] =            "rx-fcs",
 106         [NETIF_F_RXALL_BIT] =            "rx-all",
 107         [NETIF_F_HW_L2FW_DOFFLOAD_BIT] = "l2-fwd-offload",
 108         [NETIF_F_HW_TC_BIT] =            "hw-tc-offload",
 109         [NETIF_F_HW_ESP_BIT] =           "esp-hw-offload",
 110         [NETIF_F_HW_ESP_TX_CSUM_BIT] =   "esp-tx-csum-hw-offload",
 111         [NETIF_F_RX_UDP_TUNNEL_PORT_BIT] =       "rx-udp_tunnel-port-offload",
 112         [NETIF_F_HW_TLS_RECORD_BIT] =   "tls-hw-record",
 113         [NETIF_F_HW_TLS_TX_BIT] =        "tls-hw-tx-offload",
 114         [NETIF_F_HW_TLS_RX_BIT] =        "tls-hw-rx-offload",
 115 };
 116
 117 static const char
 118 rss_hash_func_strings[ETH_RSS_HASH_FUNCS_COUNT][ETH_GSTRING_LEN] = {
 119         [ETH_RSS_HASH_TOP_BIT] =        "toeplitz",
 120         [ETH_RSS_HASH_XOR_BIT] =        "xor",
 121         [ETH_RSS_HASH_CRC32_BIT] =      "crc32",
 122 };
 123
 124 static const char
 125 tunable_strings[__ETHTOOL_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
 126         [ETHTOOL_ID_UNSPEC]     = "Unspec",
 127         [ETHTOOL_RX_COPYBREAK]  = "rx-copybreak",
 128         [ETHTOOL_TX_COPYBREAK]  = "tx-copybreak",
 129         [ETHTOOL_PFC_PREVENTION_TOUT] = "pfc-prevention-tout",
 130 };
 131
 132 static const char
 133 phy_tunable_strings[__ETHTOOL_PHY_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
 134         [ETHTOOL_ID_UNSPEC]     = "Unspec",
 135         [ETHTOOL_PHY_DOWNSHIFT] = "phy-downshift",
 136 };
 137
 138 static int ethtool_get_features(struct net_device *dev, void __user *useraddr)
 139 {
 140         struct ethtool_gfeatures cmd = {
 141                 .cmd = ETHTOOL_GFEATURES,
 142                 .size = ETHTOOL_DEV_FEATURE_WORDS,
 143         };
 144         struct ethtool_get_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
 145         u32 __user *sizeaddr;
 146         u32 copy_size;
 147         int i;
 148
 149         /* in case feature bits run out again */
 150         BUILD_BUG_ON(ETHTOOL_DEV_FEATURE_WORDS * sizeof(u32) > sizeof(netdev_features_t));
 151
 152         for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
 153                 features[i].available = (u32)(dev->hw_features >> (32 * i));
 154                 features[i].requested = (u32)(dev->wanted_features >> (32 * i));
 155                 features[i].active = (u32)(dev->features >> (32 * i));
 156                 features[i].never_changed =
 157                         (u32)(NETIF_F_NEVER_CHANGE >> (32 * i));
 158         }
 159
 160         sizeaddr = useraddr + offsetof(struct ethtool_gfeatures, size);
 161         if (get_user(copy_size, sizeaddr))
 162                 return -EFAULT;
 163
 164         if (copy_size > ETHTOOL_DEV_FEATURE_WORDS)
 165                 copy_size = ETHTOOL_DEV_FEATURE_WORDS;
 166
 167         if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
 168                 return -EFAULT;
 169         useraddr += sizeof(cmd);
 170         if (copy_to_user(useraddr, features, copy_size * sizeof(*features)))
 171                 return -EFAULT;
 172
 173         return 0;
 174 }
 175
 176 static int ethtool_set_features(struct net_device *dev, void __user *useraddr)
 177 {
 178         struct ethtool_sfeatures cmd;
 179         struct ethtool_set_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
 180         netdev_features_t wanted = 0, valid = 0;
 181         int i, ret = 0;
 182
 183         if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
 184                 return -EFAULT;
 185         useraddr += sizeof(cmd);
 186
 187         if (cmd.size != ETHTOOL_DEV_FEATURE_WORDS)
 188                 return -EINVAL;
 189
 190         if (copy_from_user(features, useraddr, sizeof(features)))
 191                 return -EFAULT;
 192
 193         for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
 194                 valid |= (netdev_features_t)features[i].valid << (32 * i);
 195                 wanted |= (netdev_features_t)features[i].requested << (32 * i);
 196         }
 197
 198         if (valid & ~NETIF_F_ETHTOOL_BITS)
 199                 return -EINVAL;
 200
 201         if (valid & ~dev->hw_features) {
 202                 valid &= dev->hw_features;
 203                 ret |= ETHTOOL_F_UNSUPPORTED;
 204         }
 205
 206         dev->wanted_features &= ~valid;
 207         dev->wanted_features |= wanted & valid;
 208         __netdev_update_features(dev);
 209
 210         if ((dev->wanted_features ^ dev->features) & valid)
 211                 ret |= ETHTOOL_F_WISH;
 212
 213         return ret;
 214 }
 215
 216 static int __ethtool_get_sset_count(struct net_device *dev, int sset)
 217 {
 218         const struct ethtool_ops *ops = dev->ethtool_ops;
 219
 220         if (sset == ETH_SS_FEATURES)
 221                 return ARRAY_SIZE(netdev_features_strings);
 222
 223         if (sset == ETH_SS_RSS_HASH_FUNCS)
 224                 return ARRAY_SIZE(rss_hash_func_strings);
 225
 226         if (sset == ETH_SS_TUNABLES)
 227                 return ARRAY_SIZE(tunable_strings);
 228
 229         if (sset == ETH_SS_PHY_TUNABLES)
 230                 return ARRAY_SIZE(phy_tunable_strings);
 231
 232         if (sset == ETH_SS_PHY_STATS && dev->phydev &&
 233             !ops->get_ethtool_phy_stats)
 234                 return phy_ethtool_get_sset_count(dev->phydev);
 235
 236         if (ops->get_sset_count && ops->get_strings)
 237                 return ops->get_sset_count(dev, sset);
 238         else
 239                 return -EOPNOTSUPP;
 240 }
 241
 242 static void __ethtool_get_strings(struct net_device *dev,
 243         u32 stringset, u8 *data)
 244 {
 245         const struct ethtool_ops *ops = dev->ethtool_ops;
 246
 247         if (stringset == ETH_SS_FEATURES)
 248                 memcpy(data, netdev_features_strings,
 249                         sizeof(netdev_features_strings));
 250         else if (stringset == ETH_SS_RSS_HASH_FUNCS)
 251                 memcpy(data, rss_hash_func_strings,
 252                        sizeof(rss_hash_func_strings));
 253         else if (stringset == ETH_SS_TUNABLES)
 254                 memcpy(data, tunable_strings, sizeof(tunable_strings));
 255         else if (stringset == ETH_SS_PHY_TUNABLES)
 256                 memcpy(data, phy_tunable_strings, sizeof(phy_tunable_strings));
 257         else if (stringset == ETH_SS_PHY_STATS && dev->phydev &&
 258                  !ops->get_ethtool_phy_stats)
 259                 phy_ethtool_get_strings(dev->phydev, data);
 260         else
 261                 /* ops->get_strings is valid because checked earlier */
 262                 ops->get_strings(dev, stringset, data);
 263 }
 264
 265 static netdev_features_t ethtool_get_feature_mask(u32 eth_cmd)
 266 {
 267         /* feature masks of legacy discrete ethtool ops */
 268
 269         switch (eth_cmd) {
 270         case ETHTOOL_GTXCSUM:
 271         case ETHTOOL_STXCSUM:
 272                 return NETIF_F_CSUM_MASK | NETIF_F_SCTP_CRC;
 273         case ETHTOOL_GRXCSUM:
 274         case ETHTOOL_SRXCSUM:
 275                 return NETIF_F_RXCSUM;
 276         case ETHTOOL_GSG:
 277         case ETHTOOL_SSG:
 278                 return NETIF_F_SG;
 279         case ETHTOOL_GTSO:
 280         case ETHTOOL_STSO:
 281                 return NETIF_F_ALL_TSO;
 282         case ETHTOOL_GGSO:
 283         case ETHTOOL_SGSO:
 284                 return NETIF_F_GSO;
 285         case ETHTOOL_GGRO:
 286         case ETHTOOL_SGRO:
 287                 return NETIF_F_GRO;
 288         default:
 289                 BUG();
 290         }
 291 }
 292
 293 static int ethtool_get_one_feature(struct net_device *dev,
 294         char __user *useraddr, u32 ethcmd)
 295 {
 296         netdev_features_t mask = ethtool_get_feature_mask(ethcmd);
 297         struct ethtool_value edata = {
 298                 .cmd = ethcmd,
 299                 .data = !!(dev->features & mask),
 300         };
 301
 302         if (copy_to_user(useraddr, &edata, sizeof(edata)))
 303                 return -EFAULT;
 304         return 0;
 305 }
 306
 307 static int ethtool_set_one_feature(struct net_device *dev,
 308         void __user *useraddr, u32 ethcmd)
 309 {
 310         struct ethtool_value edata;
 311         netdev_features_t mask;
 312
 313         if (copy_from_user(&edata, useraddr, sizeof(edata)))
 314                 return -EFAULT;
 315
 316         mask = ethtool_get_feature_mask(ethcmd);
 317         mask &= dev->hw_features;
 318         if (!mask)
 319                 return -EOPNOTSUPP;
 320
 321         if (edata.data)
 322                 dev->wanted_features |= mask;
 323         else
 324                 dev->wanted_features &= ~mask;
 325
 326         __netdev_update_features(dev);
 327
 328         return 0;
 329 }
 330
 331 #define ETH_ALL_FLAGS    (ETH_FLAG_LRO | ETH_FLAG_RXVLAN | ETH_FLAG_TXVLAN | \
 332                           ETH_FLAG_NTUPLE | ETH_FLAG_RXHASH)
 333 #define ETH_ALL_FEATURES (NETIF_F_LRO | NETIF_F_HW_VLAN_CTAG_RX | \
 334                           NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_NTUPLE | \
 335                           NETIF_F_RXHASH)
 336
 337 static u32 __ethtool_get_flags(struct net_device *dev)
 338 {
 339         u32 flags = 0;
 340
 341         if (dev->features & NETIF_F_LRO)
 342                 flags |= ETH_FLAG_LRO;
 343         if (dev->features & NETIF_F_HW_VLAN_CTAG_RX)
 344                 flags |= ETH_FLAG_RXVLAN;
 345         if (dev->features & NETIF_F_HW_VLAN_CTAG_TX)
 346                 flags |= ETH_FLAG_TXVLAN;
 347         if (dev->features & NETIF_F_NTUPLE)
 348                 flags |= ETH_FLAG_NTUPLE;
 349         if (dev->features & NETIF_F_RXHASH)
 350                 flags |= ETH_FLAG_RXHASH;
 351
 352         return flags;
 353 }
 354
 355 static int __ethtool_set_flags(struct net_device *dev, u32 data)
 356 {
 357         netdev_features_t features = 0, changed;
 358
 359         if (data & ~ETH_ALL_FLAGS)
 360                 return -EINVAL;
 361
 362         if (data & ETH_FLAG_LRO)
 363                 features |= NETIF_F_LRO;
 364         if (data & ETH_FLAG_RXVLAN)
 365                 features |= NETIF_F_HW_VLAN_CTAG_RX;
 366         if (data & ETH_FLAG_TXVLAN)
 367                 features |= NETIF_F_HW_VLAN_CTAG_TX;
 368         if (data & ETH_FLAG_NTUPLE)
 369                 features |= NETIF_F_NTUPLE;
 370         if (data & ETH_FLAG_RXHASH)
 371                 features |= NETIF_F_RXHASH;
 372
 373         /* allow changing only bits set in hw_features */
 374         changed = (features ^ dev->features) & ETH_ALL_FEATURES;
 375         if (changed & ~dev->hw_features)
 376                 return (changed & dev->hw_features) ? -EINVAL : -EOPNOTSUPP;
 377
 378         dev->wanted_features =
 379                 (dev->wanted_features & ~changed) | (features & changed);
 380
 381         __netdev_update_features(dev);
 382
 383         return 0;
 384 }
 385
 386 /* Given two link masks, AND them together and save the result in dst. */
 387 void ethtool_intersect_link_masks(struct ethtool_link_ksettings *dst,
 388                                   struct ethtool_link_ksettings *src)
 389 {
 390         unsigned int size = BITS_TO_LONGS(__ETHTOOL_LINK_MODE_MASK_NBITS);
 391         unsigned int idx = 0;
 392
 393         for (; idx < size; idx++) {
 394                 dst->link_modes.supported[idx] &=
 395                         src->link_modes.supported[idx];
 396                 dst->link_modes.advertising[idx] &=
 397                         src->link_modes.advertising[idx];
 398         }
 399 }
 400 EXPORT_SYMBOL(ethtool_intersect_link_masks);
 401
 402 void ethtool_convert_legacy_u32_to_link_mode(unsigned long *dst,
 403                                              u32 legacy_u32)
 404 {
 405         bitmap_zero(dst, __ETHTOOL_LINK_MODE_MASK_NBITS);
 406         dst[0] = legacy_u32;
 407 }
 408 EXPORT_SYMBOL(ethtool_convert_legacy_u32_to_link_mode);
 409
 410 /* return false if src had higher bits set. lower bits always updated. */
 411 bool ethtool_convert_link_mode_to_legacy_u32(u32 *legacy_u32,
 412                                              const unsigned long *src)
 413 {
 414         bool retval = true;
 415
 416         /* TODO: following test will soon always be true */
 417         if (__ETHTOOL_LINK_MODE_MASK_NBITS > 32) {
 418                 __ETHTOOL_DECLARE_LINK_MODE_MASK(ext);
 419
 420                 bitmap_zero(ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
 421                 bitmap_fill(ext, 32);
 422                 bitmap_complement(ext, ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
 423                 if (bitmap_intersects(ext, src,
 424                                       __ETHTOOL_LINK_MODE_MASK_NBITS)) {
 425                         /* src mask goes beyond bit 31 */
 426                         retval = false;
 427                 }
 428         }
 429         *legacy_u32 = src[0];
 430         return retval;
 431 }
 432 EXPORT_SYMBOL(ethtool_convert_link_mode_to_legacy_u32);
 433
 434 /* return false if legacy contained non-0 deprecated fields
 435  * maxtxpkt/maxrxpkt. rest of ksettings always updated
 436  */
 437 static bool
 438 convert_legacy_settings_to_link_ksettings(
 439         struct ethtool_link_ksettings *link_ksettings,
 440         const struct ethtool_cmd *legacy_settings)
 441 {
 442         bool retval = true;
 443
 444         memset(link_ksettings, 0, sizeof(*link_ksettings));
 445
 446         /* This is used to tell users that driver is still using these
 447          * deprecated legacy fields, and they should not use
 448          * %ETHTOOL_GLINKSETTINGS/%ETHTOOL_SLINKSETTINGS
 449          */
 450         if (legacy_settings->maxtxpkt ||
 451             legacy_settings->maxrxpkt)
 452                 retval = false;
 453
 454         ethtool_convert_legacy_u32_to_link_mode(
 455                 link_ksettings->link_modes.supported,
 456                 legacy_settings->supported);
 457         ethtool_convert_legacy_u32_to_link_mode(
 458                 link_ksettings->link_modes.advertising,
 459                 legacy_settings->advertising);
 460         ethtool_convert_legacy_u32_to_link_mode(
 461                 link_ksettings->link_modes.lp_advertising,
 462                 legacy_settings->lp_advertising);
 463         link_ksettings->base.speed
 464                 = ethtool_cmd_speed(legacy_settings);
 465         link_ksettings->base.duplex
 466                 = legacy_settings->duplex;
 467         link_ksettings->base.port
 468                 = legacy_settings->port;
 469         link_ksettings->base.phy_address
 470                 = legacy_settings->phy_address;
 471         link_ksettings->base.autoneg
 472                 = legacy_settings->autoneg;
 473         link_ksettings->base.mdio_support
 474                 = legacy_settings->mdio_support;
 475         link_ksettings->base.eth_tp_mdix
 476                 = legacy_settings->eth_tp_mdix;
 477         link_ksettings->base.eth_tp_mdix_ctrl
 478                 = legacy_settings->eth_tp_mdix_ctrl;
 479         return retval;
 480 }
 481
 482 /* return false if ksettings link modes had higher bits
 483  * set. legacy_settings always updated (best effort)
 484  */
 485 static bool
 486 convert_link_ksettings_to_legacy_settings(
 487         struct ethtool_cmd *legacy_settings,
 488         const struct ethtool_link_ksettings *link_ksettings)
 489 {
 490         bool retval = true;
 491
 492         memset(legacy_settings, 0, sizeof(*legacy_settings));
 493         /* this also clears the deprecated fields in legacy structure:
 494          * __u8         transceiver;
 495          * __u32        maxtxpkt;
 496          * __u32        maxrxpkt;
 497          */
 498
 499         retval &= ethtool_convert_link_mode_to_legacy_u32(
 500                 &legacy_settings->supported,
 501                 link_ksettings->link_modes.supported);
 502         retval &= ethtool_convert_link_mode_to_legacy_u32(
 503                 &legacy_settings->advertising,
 504                 link_ksettings->link_modes.advertising);
 505         retval &= ethtool_convert_link_mode_to_legacy_u32(
 506                 &legacy_settings->lp_advertising,
 507                 link_ksettings->link_modes.lp_advertising);
 508         ethtool_cmd_speed_set(legacy_settings, link_ksettings->base.speed);
 509         legacy_settings->duplex
 510                 = link_ksettings->base.duplex;
 511         legacy_settings->port
 512                 = link_ksettings->base.port;
 513         legacy_settings->phy_address
 514                 = link_ksettings->base.phy_address;
 515         legacy_settings->autoneg
 516                 = link_ksettings->base.autoneg;
 517         legacy_settings->mdio_support
 518                 = link_ksettings->base.mdio_support;
 519         legacy_settings->eth_tp_mdix
 520                 = link_ksettings->base.eth_tp_mdix;
 521         legacy_settings->eth_tp_mdix_ctrl
 522                 = link_ksettings->base.eth_tp_mdix_ctrl;
 523         legacy_settings->transceiver
 524                 = link_ksettings->base.transceiver;
 525         return retval;
 526 }
 527
 528 /* number of 32-bit words to store the user's link mode bitmaps */
 529 #define __ETHTOOL_LINK_MODE_MASK_NU32                   \
 530         DIV_ROUND_UP(__ETHTOOL_LINK_MODE_MASK_NBITS, 32)
 531
 532 /* layout of the struct passed from/to userland */
 533 struct ethtool_link_usettings {
 534         struct ethtool_link_settings base;
 535         struct {
 536                 __u32 supported[__ETHTOOL_LINK_MODE_MASK_NU32];
 537                 __u32 advertising[__ETHTOOL_LINK_MODE_MASK_NU32];
 538                 __u32 lp_advertising[__ETHTOOL_LINK_MODE_MASK_NU32];
 539         } link_modes;
 540 };
 541
 542 /* Internal kernel helper to query a device ethtool_link_settings.
 543  *
 544  * Backward compatibility note: for compatibility with legacy drivers
 545  * that implement only the ethtool_cmd API, this has to work with both
 546  * drivers implementing get_link_ksettings API and drivers
 547  * implementing get_settings API. When drivers implement get_settings
 548  * and report ethtool_cmd deprecated fields
 549  * (transceiver/maxrxpkt/maxtxpkt), these fields are silently ignored
 550  * because the resulting struct ethtool_link_settings does not report them.
 551  */
 552 int __ethtool_get_link_ksettings(struct net_device *dev,
 553                                  struct ethtool_link_ksettings *link_ksettings)
 554 {
 555         int err;
 556         struct ethtool_cmd cmd;
 557
 558         ASSERT_RTNL();
 559
 560         if (dev->ethtool_ops->get_link_ksettings) {
 561                 memset(link_ksettings, 0, sizeof(*link_ksettings));
 562                 return dev->ethtool_ops->get_link_ksettings(dev,
 563                                                             link_ksettings);
 564         }
 565
 566         /* driver doesn't support %ethtool_link_ksettings API. revert to
 567          * legacy %ethtool_cmd API, unless it's not supported either.
 568          * TODO: remove when ethtool_ops::get_settings disappears internally
 569          */
 570         if (!dev->ethtool_ops->get_settings)
 571                 return -EOPNOTSUPP;
 572
 573         memset(&cmd, 0, sizeof(cmd));
 574         cmd.cmd = ETHTOOL_GSET;
 575         err = dev->ethtool_ops->get_settings(dev, &cmd);
 576         if (err < 0)
 577                 return err;
 578
 579         /* we ignore deprecated fields transceiver/maxrxpkt/maxtxpkt
 580          */
 581         convert_legacy_settings_to_link_ksettings(link_ksettings, &cmd);
 582         return err;
 583 }
 584 EXPORT_SYMBOL(__ethtool_get_link_ksettings);
 585
 586 /* convert ethtool_link_usettings in user space to a kernel internal
 587  * ethtool_link_ksettings. return 0 on success, errno on error.
 588  */
 589 static int load_link_ksettings_from_user(struct ethtool_link_ksettings *to,
 590                                          const void __user *from)
 591 {
 592         struct ethtool_link_usettings link_usettings;
 593
 594         if (copy_from_user(&link_usettings, from, sizeof(link_usettings)))
 595                 return -EFAULT;
 596
 597         memcpy(&to->base, &link_usettings.base, sizeof(to->base));
 598         bitmap_from_arr32(to->link_modes.supported,
 599                           link_usettings.link_modes.supported,
 600                           __ETHTOOL_LINK_MODE_MASK_NBITS);
 601         bitmap_from_arr32(to->link_modes.advertising,
 602                           link_usettings.link_modes.advertising,
 603                           __ETHTOOL_LINK_MODE_MASK_NBITS);
 604         bitmap_from_arr32(to->link_modes.lp_advertising,
 605                           link_usettings.link_modes.lp_advertising,
 606                           __ETHTOOL_LINK_MODE_MASK_NBITS);
 607
 608         return 0;
 609 }
 610
 611 /* convert a kernel internal ethtool_link_ksettings to
 612  * ethtool_link_usettings in user space. return 0 on success, errno on
 613  * error.
 614  */
 615 static int
 616 store_link_ksettings_for_user(void __user *to,
 617                               const struct ethtool_link_ksettings *from)
 618 {
 619         struct ethtool_link_usettings link_usettings;
 620
 621         memcpy(&link_usettings.base, &from->base, sizeof(link_usettings));
 622         bitmap_to_arr32(link_usettings.link_modes.supported,
 623                         from->link_modes.supported,
 624                         __ETHTOOL_LINK_MODE_MASK_NBITS);
 625         bitmap_to_arr32(link_usettings.link_modes.advertising,
 626                         from->link_modes.advertising,
 627                         __ETHTOOL_LINK_MODE_MASK_NBITS);
 628         bitmap_to_arr32(link_usettings.link_modes.lp_advertising,
 629                         from->link_modes.lp_advertising,
 630                         __ETHTOOL_LINK_MODE_MASK_NBITS);
 631
 632         if (copy_to_user(to, &link_usettings, sizeof(link_usettings)))
 633                 return -EFAULT;
 634
 635         return 0;
 636 }
 637
 638 /* Query device for its ethtool_link_settings.
 639  *
 640  * Backward compatibility note: this function must fail when driver
 641  * does not implement ethtool::get_link_ksettings, even if legacy
 642  * ethtool_ops::get_settings is implemented. This tells new versions
 643  * of ethtool that they should use the legacy API %ETHTOOL_GSET for
 644  * this driver, so that they can correctly access the ethtool_cmd
 645  * deprecated fields (transceiver/maxrxpkt/maxtxpkt), until no driver
 646  * implements ethtool_ops::get_settings anymore.
 647  */
 648 static int ethtool_get_link_ksettings(struct net_device *dev,
 649                                       void __user *useraddr)
 650 {
 651         int err = 0;
 652         struct ethtool_link_ksettings link_ksettings;
 653
 654         ASSERT_RTNL();
 655
 656         if (!dev->ethtool_ops->get_link_ksettings)
 657                 return -EOPNOTSUPP;
 658
 659         /* handle bitmap nbits handshake */
 660         if (copy_from_user(&link_ksettings.base, useraddr,
 661                            sizeof(link_ksettings.base)))
 662                 return -EFAULT;
 663
 664         if (__ETHTOOL_LINK_MODE_MASK_NU32
 665             != link_ksettings.base.link_mode_masks_nwords) {
 666                 /* wrong link mode nbits requested */
 667                 memset(&link_ksettings, 0, sizeof(link_ksettings));
 668                 link_ksettings.base.cmd = ETHTOOL_GLINKSETTINGS;
 669                 /* send back number of words required as negative val */
 670                 compiletime_assert(__ETHTOOL_LINK_MODE_MASK_NU32 <= S8_MAX,
 671                                    "need too many bits for link modes!");
 672                 link_ksettings.base.link_mode_masks_nwords
 673                         = -((s8)__ETHTOOL_LINK_MODE_MASK_NU32);
 674
 675                 /* copy the base fields back to user, not the link
 676                  * mode bitmaps
 677                  */
 678                 if (copy_to_user(useraddr, &link_ksettings.base,
 679                                  sizeof(link_ksettings.base)))
 680                         return -EFAULT;
 681
 682                 return 0;
 683         }
 684
 685         /* handshake successful: user/kernel agree on
 686          * link_mode_masks_nwords
 687          */
 688
 689         memset(&link_ksettings, 0, sizeof(link_ksettings));
 690         err = dev->ethtool_ops->get_link_ksettings(dev, &link_ksettings);
 691         if (err < 0)
 692                 return err;
 693
 694         /* make sure we tell the right values to user */
 695         link_ksettings.base.cmd = ETHTOOL_GLINKSETTINGS;
 696         link_ksettings.base.link_mode_masks_nwords
 697                 = __ETHTOOL_LINK_MODE_MASK_NU32;
 698
 699         return store_link_ksettings_for_user(useraddr, &link_ksettings);
 700 }
 701
 702 /* Update device ethtool_link_settings.
 703  *
 704  * Backward compatibility note: this function must fail when driver
 705  * does not implement ethtool::set_link_ksettings, even if legacy
 706  * ethtool_ops::set_settings is implemented. This tells new versions
 707  * of ethtool that they should use the legacy API %ETHTOOL_SSET for
 708  * this driver, so that they can correctly update the ethtool_cmd
 709  * deprecated fields (transceiver/maxrxpkt/maxtxpkt), until no driver
 710  * implements ethtool_ops::get_settings anymore.
 711  */
 712 static int ethtool_set_link_ksettings(struct net_device *dev,
 713                                       void __user *useraddr)
 714 {
 715         int err;
 716         struct ethtool_link_ksettings link_ksettings;
 717
 718         ASSERT_RTNL();
 719
 720         if (!dev->ethtool_ops->set_link_ksettings)
 721                 return -EOPNOTSUPP;
 722
 723         /* make sure nbits field has expected value */
 724         if (copy_from_user(&link_ksettings.base, useraddr,
 725                            sizeof(link_ksettings.base)))
 726                 return -EFAULT;
 727
 728         if (__ETHTOOL_LINK_MODE_MASK_NU32
 729             != link_ksettings.base.link_mode_masks_nwords)
 730                 return -EINVAL;
 731
 732         /* copy the whole structure, now that we know it has expected
 733          * format
 734          */
 735         err = load_link_ksettings_from_user(&link_ksettings, useraddr);
 736         if (err)
 737                 return err;
 738
 739         /* re-check nwords field, just in case */
 740         if (__ETHTOOL_LINK_MODE_MASK_NU32
 741             != link_ksettings.base.link_mode_masks_nwords)
 742                 return -EINVAL;
 743
 744         return dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings);
 745 }
 746
 747 /* Query device for its ethtool_cmd settings.
 748  *
 749  * Backward compatibility note: for compatibility with legacy ethtool,
 750  * this has to work with both drivers implementing get_link_ksettings
 751  * API and drivers implementing get_settings API. When drivers
 752  * implement get_link_ksettings and report higher link mode bits, a
 753  * kernel warning is logged once (with name of 1st driver/device) to
 754  * recommend user to upgrade ethtool, but the command is successful
 755  * (only the lower link mode bits reported back to user).
 756  */
 757 static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
 758 {
 759         struct ethtool_cmd cmd;
 760
 761         ASSERT_RTNL();
 762
 763         if (dev->ethtool_ops->get_link_ksettings) {
 764                 /* First, use link_ksettings API if it is supported */
 765                 int err;
 766                 struct ethtool_link_ksettings link_ksettings;
 767
 768                 memset(&link_ksettings, 0, sizeof(link_ksettings));
 769                 err = dev->ethtool_ops->get_link_ksettings(dev,
 770                                                            &link_ksettings);
 771                 if (err < 0)
 772                         return err;
 773                 convert_link_ksettings_to_legacy_settings(&cmd,
 774                                                           &link_ksettings);
 775
 776                 /* send a sensible cmd tag back to user */
 777                 cmd.cmd = ETHTOOL_GSET;
 778         } else {
 779                 /* driver doesn't support %ethtool_link_ksettings
 780                  * API. revert to legacy %ethtool_cmd API, unless it's
 781                  * not supported either.
 782                  */
 783                 int err;
 784
 785                 if (!dev->ethtool_ops->get_settings)
 786                         return -EOPNOTSUPP;
 787
 788                 memset(&cmd, 0, sizeof(cmd));
 789                 cmd.cmd = ETHTOOL_GSET;
 790                 err = dev->ethtool_ops->get_settings(dev, &cmd);
 791                 if (err < 0)
 792                         return err;
 793         }
 794
 795         if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
 796                 return -EFAULT;
 797
 798         return 0;
 799 }
 800
 801 /* Update device link settings with given ethtool_cmd.
 802  *
 803  * Backward compatibility note: for compatibility with legacy ethtool,
 804  * this has to work with both drivers implementing set_link_ksettings
 805  * API and drivers implementing set_settings API. When drivers
 806  * implement set_link_ksettings and user's request updates deprecated
 807  * ethtool_cmd fields (transceiver/maxrxpkt/maxtxpkt), a kernel
 808  * warning is logged once (with name of 1st driver/device) to
 809  * recommend user to upgrade ethtool, and the request is rejected.
 810  */
 811 static int ethtool_set_settings(struct net_device *dev, void __user *useraddr)
 812 {
 813         struct ethtool_cmd cmd;
 814
 815         ASSERT_RTNL();
 816
 817         if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
 818                 return -EFAULT;
 819
 820         /* first, try new %ethtool_link_ksettings API. */
 821         if (dev->ethtool_ops->set_link_ksettings) {
 822                 struct ethtool_link_ksettings link_ksettings;
 823
 824                 if (!convert_legacy_settings_to_link_ksettings(&link_ksettings,
 825                                                                &cmd))
 826                         return -EINVAL;
 827
 828                 link_ksettings.base.cmd = ETHTOOL_SLINKSETTINGS;
 829                 link_ksettings.base.link_mode_masks_nwords
 830                         = __ETHTOOL_LINK_MODE_MASK_NU32;
 831                 return dev->ethtool_ops->set_link_ksettings(dev,
 832                                                             &link_ksettings);
 833         }
 834
 835         /* legacy %ethtool_cmd API */
 836
 837         /* TODO: return -EOPNOTSUPP when ethtool_ops::get_settings
 838          * disappears internally
 839          */
 840
 841         if (!dev->ethtool_ops->set_settings)
 842                 return -EOPNOTSUPP;
 843
 844         return dev->ethtool_ops->set_settings(dev, &cmd);
 845 }
 846
 847 static noinline_for_stack int ethtool_get_drvinfo(struct net_device *dev,
 848                                                   void __user *useraddr)
 849 {
 850         struct ethtool_drvinfo info;
 851         const struct ethtool_ops *ops = dev->ethtool_ops;
 852
 853         memset(&info, 0, sizeof(info));
 854         info.cmd = ETHTOOL_GDRVINFO;
 855         if (ops->get_drvinfo) {
 856                 ops->get_drvinfo(dev, &info);
 857         } else if (dev->dev.parent && dev->dev.parent->driver) {
 858                 strlcpy(info.bus_info, dev_name(dev->dev.parent),
 859                         sizeof(info.bus_info));
 860                 strlcpy(info.driver, dev->dev.parent->driver->name,
 861                         sizeof(info.driver));
 862         } else {
 863                 return -EOPNOTSUPP;
 864         }
 865
 866         /*
 867          * this method of obtaining string set info is deprecated;
 868          * Use ETHTOOL_GSSET_INFO instead.
 869          */
 870         if (ops->get_sset_count) {
 871                 int rc;
 872
 873                 rc = ops->get_sset_count(dev, ETH_SS_TEST);
 874                 if (rc >= 0)
 875                         info.testinfo_len = rc;
 876                 rc = ops->get_sset_count(dev, ETH_SS_STATS);
 877                 if (rc >= 0)
 878                         info.n_stats = rc;
 879                 rc = ops->get_sset_count(dev, ETH_SS_PRIV_FLAGS);
 880                 if (rc >= 0)
 881                         info.n_priv_flags = rc;
 882         }
 883         if (ops->get_regs_len)
 884                 info.regdump_len = ops->get_regs_len(dev);
 885         if (ops->get_eeprom_len)
 886                 info.eedump_len = ops->get_eeprom_len(dev);
 887
 888         if (copy_to_user(useraddr, &info, sizeof(info)))
 889                 return -EFAULT;
 890         return 0;
 891 }
 892
 893 static noinline_for_stack int ethtool_get_sset_info(struct net_device *dev,
 894                                                     void __user *useraddr)
 895 {
 896         struct ethtool_sset_info info;
 897         u64 sset_mask;
 898         int i, idx = 0, n_bits = 0, ret, rc;
 899         u32 *info_buf = NULL;
 900
 901         if (copy_from_user(&info, useraddr, sizeof(info)))
 902                 return -EFAULT;
 903
 904         /* store copy of mask, because we zero struct later on */
 905         sset_mask = info.sset_mask;
 906         if (!sset_mask)
 907                 return 0;
 908
 909         /* calculate size of return buffer */
 910         n_bits = hweight64(sset_mask);
 911
 912         memset(&info, 0, sizeof(info));
 913         info.cmd = ETHTOOL_GSSET_INFO;
 914
 915         info_buf = kcalloc(n_bits, sizeof(u32), GFP_USER);
 916         if (!info_buf)
 917                 return -ENOMEM;
 918
 919         /*
 920          * fill return buffer based on input bitmask and successful
 921          * get_sset_count return
 922          */
 923         for (i = 0; i < 64; i++) {
 924                 if (!(sset_mask & (1ULL << i)))
 925                         continue;
 926
 927                 rc = __ethtool_get_sset_count(dev, i);
 928                 if (rc >= 0) {
 929                         info.sset_mask |= (1ULL << i);
 930                         info_buf[idx++] = rc;
 931                 }
 932         }
 933
 934         ret = -EFAULT;
 935         if (copy_to_user(useraddr, &info, sizeof(info)))
 936                 goto out;
 937
 938         useraddr += offsetof(struct ethtool_sset_info, data);
 939         if (copy_to_user(useraddr, info_buf, idx * sizeof(u32)))
 940                 goto out;
 941
 942         ret = 0;
 943
 944 out:
 945         kfree(info_buf);
 946         return ret;
 947 }
 948
 949 static noinline_for_stack int ethtool_set_rxnfc(struct net_device *dev,
 950                                                 u32 cmd, void __user *useraddr)
 951 {
 952         struct ethtool_rxnfc info;
 953         size_t info_size = sizeof(info);
 954         int rc;
 955
 956         if (!dev->ethtool_ops->set_rxnfc)
 957                 return -EOPNOTSUPP;
 958
 959         /* struct ethtool_rxnfc was originally defined for
 960          * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
 961          * members.  User-space might still be using that
 962          * definition. */
 963         if (cmd == ETHTOOL_SRXFH)
 964                 info_size = (offsetof(struct ethtool_rxnfc, data) +
 965                              sizeof(info.data));
 966
 967         if (copy_from_user(&info, useraddr, info_size))
 968                 return -EFAULT;
 969
 970         rc = dev->ethtool_ops->set_rxnfc(dev, &info);
 971         if (rc)
 972                 return rc;
 973
 974         if (cmd == ETHTOOL_SRXCLSRLINS &&
 975             copy_to_user(useraddr, &info, info_size))
 976                 return -EFAULT;
 977
 978         return 0;
 979 }
 980
 981 static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,
 982                                                 u32 cmd, void __user *useraddr)
 983 {
 984         struct ethtool_rxnfc info;
 985         size_t info_size = sizeof(info);
 986         const struct ethtool_ops *ops = dev->ethtool_ops;
 987         int ret;
 988         void *rule_buf = NULL;
 989
 990         if (!ops->get_rxnfc)
 991                 return -EOPNOTSUPP;
 992
 993         /* struct ethtool_rxnfc was originally defined for
 994          * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
 995          * members.  User-space might still be using that
 996          * definition. */
 997         if (cmd == ETHTOOL_GRXFH)
 998                 info_size = (offsetof(struct ethtool_rxnfc, data) +
 999                              sizeof(info.data));
1000
1001         if (copy_from_user(&info, useraddr, info_size))
1002                 return -EFAULT;
1003
1004         /* If FLOW_RSS was requested then user-space must be using the
1005          * new definition, as FLOW_RSS is newer.
1006          */
1007         if (cmd == ETHTOOL_GRXFH && info.flow_type & FLOW_RSS) {
1008                 info_size = sizeof(info);
1009                 if (copy_from_user(&info, useraddr, info_size))
1010                         return -EFAULT;
1011                 /* Since malicious users may modify the original data,
1012                  * we need to check whether FLOW_RSS is still requested.
1013                  */
1014                 if (!(info.flow_type & FLOW_RSS))
1015                         return -EINVAL;
1016         }
1017
1018         if (info.cmd == ETHTOOL_GRXCLSRLALL) {
1019                 if (info.rule_cnt > 0) {
1020                         if (info.rule_cnt <= KMALLOC_MAX_SIZE / sizeof(u32))
1021                                 rule_buf = kcalloc(info.rule_cnt, sizeof(u32),
1022                                                    GFP_USER);
1023                         if (!rule_buf)
1024                                 return -ENOMEM;
1025                 }
1026         }
1027
1028         ret = ops->get_rxnfc(dev, &info, rule_buf);
1029         if (ret < 0)
1030                 goto err_out;
1031
1032         ret = -EFAULT;
1033         if (copy_to_user(useraddr, &info, info_size))
1034                 goto err_out;
1035
1036         if (rule_buf) {
1037                 useraddr += offsetof(struct ethtool_rxnfc, rule_locs);
1038                 if (copy_to_user(useraddr, rule_buf,
1039                                  info.rule_cnt * sizeof(u32)))
1040                         goto err_out;
1041         }
1042         ret = 0;
1043
1044 err_out:
1045         kfree(rule_buf);
1046
1047         return ret;
1048 }
1049
1050 static int ethtool_copy_validate_indir(u32 *indir, void __user *useraddr,
1051                                         struct ethtool_rxnfc *rx_rings,
1052                                         u32 size)
1053 {
1054         int i;
1055
1056         if (copy_from_user(indir, useraddr, size * sizeof(indir[0])))
1057                 return -EFAULT;
1058
1059         /* Validate ring indices */
1060         for (i = 0; i < size; i++)
1061                 if (indir[i] >= rx_rings->data)
1062                         return -EINVAL;
1063
1064         return 0;
1065 }
1066
1067 u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly;
1068
1069 void netdev_rss_key_fill(void *buffer, size_t len)
1070 {
1071         BUG_ON(len > sizeof(netdev_rss_key));
1072         net_get_random_once(netdev_rss_key, sizeof(netdev_rss_key));
1073         memcpy(buffer, netdev_rss_key, len);
1074 }
1075 EXPORT_SYMBOL(netdev_rss_key_fill);
1076
1077 static int ethtool_get_max_rxfh_channel(struct net_device *dev, u32 *max)
1078 {
1079         u32 dev_size, current_max = 0;
1080         u32 *indir;
1081         int ret;
1082
1083         if (!dev->ethtool_ops->get_rxfh_indir_size ||
1084             !dev->ethtool_ops->get_rxfh)
1085                 return -EOPNOTSUPP;
1086         dev_size = dev->ethtool_ops->get_rxfh_indir_size(dev);
1087         if (dev_size == 0)
1088                 return -EOPNOTSUPP;
1089
1090         indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
1091         if (!indir)
1092                 return -ENOMEM;
1093
1094         ret = dev->ethtool_ops->get_rxfh(dev, indir, NULL, NULL);
1095         if (ret)
1096                 goto out;
1097
1098         while (dev_size--)
1099                 current_max = max(current_max, indir[dev_size]);
1100
1101         *max = current_max;
1102
1103 out:
1104         kfree(indir);
1105         return ret;
1106 }
1107
1108 static noinline_for_stack int ethtool_get_rxfh_indir(struct net_device *dev,
1109                                                      void __user *useraddr)
1110 {
1111         u32 user_size, dev_size;
1112         u32 *indir;
1113         int ret;
1114
1115         if (!dev->ethtool_ops->get_rxfh_indir_size ||
1116             !dev->ethtool_ops->get_rxfh)
1117                 return -EOPNOTSUPP;
1118         dev_size = dev->ethtool_ops->get_rxfh_indir_size(dev);
1119         if (dev_size == 0)
1120                 return -EOPNOTSUPP;
1121
1122         if (copy_from_user(&user_size,
1123                            useraddr + offsetof(struct ethtool_rxfh_indir, size),
1124                            sizeof(user_size)))
1125                 return -EFAULT;
1126
1127         if (copy_to_user(useraddr + offsetof(struct ethtool_rxfh_indir, size),
1128                          &dev_size, sizeof(dev_size)))
1129                 return -EFAULT;
1130
1131         /* If the user buffer size is 0, this is just a query for the
1132          * device table size.  Otherwise, if it's smaller than the
1133          * device table size it's an error.
1134          */
1135         if (user_size < dev_size)
1136                 return user_size == 0 ? 0 : -EINVAL;
1137
1138         indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
1139         if (!indir)
1140                 return -ENOMEM;
1141
1142         ret = dev->ethtool_ops->get_rxfh(dev, indir, NULL, NULL);
1143         if (ret)
1144                 goto out;
1145
1146         if (copy_to_user(useraddr +
1147                          offsetof(struct ethtool_rxfh_indir, ring_index[0]),
1148                          indir, dev_size * sizeof(indir[0])))
1149                 ret = -EFAULT;
1150
1151 out:
1152         kfree(indir);
1153         return ret;
1154 }
1155
1156 static noinline_for_stack int ethtool_set_rxfh_indir(struct net_device *dev,
1157                                                      void __user *useraddr)
1158 {
1159         struct ethtool_rxnfc rx_rings;
1160         u32 user_size, dev_size, i;
1161         u32 *indir;
1162         const struct ethtool_ops *ops = dev->ethtool_ops;
1163         int ret;
1164         u32 ringidx_offset = offsetof(struct ethtool_rxfh_indir, ring_index[0]);
1165
1166         if (!ops->get_rxfh_indir_size || !ops->set_rxfh ||
1167             !ops->get_rxnfc)
1168                 return -EOPNOTSUPP;
1169
1170         dev_size = ops->get_rxfh_indir_size(dev);
1171         if (dev_size == 0)
1172                 return -EOPNOTSUPP;
1173
1174         if (copy_from_user(&user_size,
1175                            useraddr + offsetof(struct ethtool_rxfh_indir, size),
1176                            sizeof(user_size)))
1177                 return -EFAULT;
1178
1179         if (user_size != 0 && user_size != dev_size)
1180                 return -EINVAL;
1181
1182         indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
1183         if (!indir)
1184                 return -ENOMEM;
1185
1186         rx_rings.cmd = ETHTOOL_GRXRINGS;
1187         ret = ops->get_rxnfc(dev, &rx_rings, NULL);
1188         if (ret)
1189                 goto out;
1190
1191         if (user_size == 0) {
1192                 for (i = 0; i < dev_size; i++)
1193                         indir[i] = ethtool_rxfh_indir_default(i, rx_rings.data);
1194         } else {
1195                 ret = ethtool_copy_validate_indir(indir,
1196                                                   useraddr + ringidx_offset,
1197                                                   &rx_rings,
1198                                                   dev_size);
1199                 if (ret)
1200                         goto out;
1201         }
1202
1203         ret = ops->set_rxfh(dev, indir, NULL, ETH_RSS_HASH_NO_CHANGE);
1204         if (ret)
1205                 goto out;
1206
1207         /* indicate whether rxfh was set to default */
1208         if (user_size == 0)
1209                 dev->priv_flags &= ~IFF_RXFH_CONFIGURED;
1210         else
1211                 dev->priv_flags |= IFF_RXFH_CONFIGURED;
1212
1213 out:
1214         kfree(indir);
1215         return ret;
1216 }
1217
1218 static noinline_for_stack int ethtool_get_rxfh(struct net_device *dev,
1219                                                void __user *useraddr)
1220 {
1221         int ret;
1222         const struct ethtool_ops *ops = dev->ethtool_ops;
1223         u32 user_indir_size, user_key_size;
1224         u32 dev_indir_size = 0, dev_key_size = 0;
1225         struct ethtool_rxfh rxfh;
1226         u32 total_size;
1227         u32 indir_bytes;
1228         u32 *indir = NULL;
1229         u8 dev_hfunc = 0;
1230         u8 *hkey = NULL;
1231         u8 *rss_config;
1232
1233         if (!ops->get_rxfh)
1234                 return -EOPNOTSUPP;
1235
1236         if (ops->get_rxfh_indir_size)
1237                 dev_indir_size = ops->get_rxfh_indir_size(dev);
1238         if (ops->get_rxfh_key_size)
1239                 dev_key_size = ops->get_rxfh_key_size(dev);
1240
1241         if (copy_from_user(&rxfh, useraddr, sizeof(rxfh)))
1242                 return -EFAULT;
1243         user_indir_size = rxfh.indir_size;
1244         user_key_size = rxfh.key_size;
1245
1246         /* Check that reserved fields are 0 for now */
1247         if (rxfh.rsvd8[0] || rxfh.rsvd8[1] || rxfh.rsvd8[2] || rxfh.rsvd32)
1248                 return -EINVAL;
1249         /* Most drivers don't handle rss_context, check it's 0 as well */
1250         if (rxfh.rss_context && !ops->get_rxfh_context)
1251                 return -EOPNOTSUPP;
1252
1253         rxfh.indir_size = dev_indir_size;
1254         rxfh.key_size = dev_key_size;
1255         if (copy_to_user(useraddr, &rxfh, sizeof(rxfh)))
1256                 return -EFAULT;
1257
1258         if ((user_indir_size && (user_indir_size != dev_indir_size)) ||
1259             (user_key_size && (user_key_size != dev_key_size)))
1260                 return -EINVAL;
1261
1262         indir_bytes = user_indir_size * sizeof(indir[0]);
1263         total_size = indir_bytes + user_key_size;
1264         rss_config = kzalloc(total_size, GFP_USER);
1265         if (!rss_config)
1266                 return -ENOMEM;
1267
1268         if (user_indir_size)
1269                 indir = (u32 *)rss_config;
1270
1271         if (user_key_size)
1272                 hkey = rss_config + indir_bytes;
1273
1274         if (rxfh.rss_context)
1275                 ret = dev->ethtool_ops->get_rxfh_context(dev, indir, hkey,
1276                                                          &dev_hfunc,
1277                                                          rxfh.rss_context);
1278         else
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         bool delete = false;
1310
1311         if (!ops->get_rxnfc || !ops->set_rxfh)
1312                 return -EOPNOTSUPP;
1313
1314         if (ops->get_rxfh_indir_size)
1315                 dev_indir_size = ops->get_rxfh_indir_size(dev);
1316         if (ops->get_rxfh_key_size)
1317                 dev_key_size = ops->get_rxfh_key_size(dev);
1318
1319         if (copy_from_user(&rxfh, useraddr, sizeof(rxfh)))
1320                 return -EFAULT;
1321
1322         /* Check that reserved fields are 0 for now */
1323         if (rxfh.rsvd8[0] || rxfh.rsvd8[1] || rxfh.rsvd8[2] || rxfh.rsvd32)
1324                 return -EINVAL;
1325         /* Most drivers don't handle rss_context, check it's 0 as well */
1326         if (rxfh.rss_context && !ops->set_rxfh_context)
1327                 return -EOPNOTSUPP;
1328
1329         /* If either indir, hash key or function is valid, proceed further.
1330          * Must request at least one change: indir size, hash key or function.
1331          */
1332         if ((rxfh.indir_size &&
1333              rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE &&
1334              rxfh.indir_size != dev_indir_size) ||
1335             (rxfh.key_size && (rxfh.key_size != dev_key_size)) ||
1336             (rxfh.indir_size == ETH_RXFH_INDIR_NO_CHANGE &&
1337              rxfh.key_size == 0 && rxfh.hfunc == ETH_RSS_HASH_NO_CHANGE))
1338                 return -EINVAL;
1339
1340         if (rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE)
1341                 indir_bytes = dev_indir_size * sizeof(indir[0]);
1342
1343         rss_config = kzalloc(indir_bytes + rxfh.key_size, GFP_USER);
1344         if (!rss_config)
1345                 return -ENOMEM;
1346
1347         rx_rings.cmd = ETHTOOL_GRXRINGS;
1348         ret = ops->get_rxnfc(dev, &rx_rings, NULL);
1349         if (ret)
1350                 goto out;
1351
1352         /* rxfh.indir_size == 0 means reset the indir table to default (master
1353          * context) or delete the context (other RSS contexts).
1354          * rxfh.indir_size == ETH_RXFH_INDIR_NO_CHANGE means leave it unchanged.
1355          */
1356         if (rxfh.indir_size &&
1357             rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE) {
1358                 indir = (u32 *)rss_config;
1359                 ret = ethtool_copy_validate_indir(indir,
1360                                                   useraddr + rss_cfg_offset,
1361                                                   &rx_rings,
1362                                                   rxfh.indir_size);
1363                 if (ret)
1364                         goto out;
1365         } else if (rxfh.indir_size == 0) {
1366                 if (rxfh.rss_context == 0) {
1367                         indir = (u32 *)rss_config;
1368                         for (i = 0; i < dev_indir_size; i++)
1369                                 indir[i] = ethtool_rxfh_indir_default(i, rx_rings.data);
1370                 } else {
1371                         delete = true;
1372                 }
1373         }
1374
1375         if (rxfh.key_size) {
1376                 hkey = rss_config + indir_bytes;
1377                 if (copy_from_user(hkey,
1378                                    useraddr + rss_cfg_offset + indir_bytes,
1379                                    rxfh.key_size)) {
1380                         ret = -EFAULT;
1381                         goto out;
1382                 }
1383         }
1384
1385         if (rxfh.rss_context)
1386                 ret = ops->set_rxfh_context(dev, indir, hkey, rxfh.hfunc,
1387                                             &rxfh.rss_context, delete);
1388         else
1389                 ret = ops->set_rxfh(dev, indir, hkey, rxfh.hfunc);
1390         if (ret)
1391                 goto out;
1392
1393         if (copy_to_user(useraddr + offsetof(struct ethtool_rxfh, rss_context),
1394                          &rxfh.rss_context, sizeof(rxfh.rss_context)))
1395                 ret = -EFAULT;
1396
1397         if (!rxfh.rss_context) {
1398                 /* indicate whether rxfh was set to default */
1399                 if (rxfh.indir_size == 0)
1400                         dev->priv_flags &= ~IFF_RXFH_CONFIGURED;
1401                 else if (rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE)
1402                         dev->priv_flags |= IFF_RXFH_CONFIGURED;
1403         }
1404
1405 out:
1406         kfree(rss_config);
1407         return ret;
1408 }
1409
1410 static int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
1411 {
1412         struct ethtool_regs regs;
1413         const struct ethtool_ops *ops = dev->ethtool_ops;
1414         void *regbuf;
1415         int reglen, ret;
1416
1417         if (!ops->get_regs || !ops->get_regs_len)
1418                 return -EOPNOTSUPP;
1419
1420         if (copy_from_user(&regs, useraddr, sizeof(regs)))
1421                 return -EFAULT;
1422
1423         reglen = ops->get_regs_len(dev);
1424         if (regs.len > reglen)
1425                 regs.len = reglen;
1426
1427         regbuf = NULL;
1428         if (reglen) {
1429                 regbuf = vzalloc(reglen);
1430                 if (!regbuf)
1431                         return -ENOMEM;
1432         }
1433
1434         ops->get_regs(dev, &regs, regbuf);
1435
1436         ret = -EFAULT;
1437         if (copy_to_user(useraddr, &regs, sizeof(regs)))
1438                 goto out;
1439         useraddr += offsetof(struct ethtool_regs, data);
1440         if (regbuf && copy_to_user(useraddr, regbuf, regs.len))
1441                 goto out;
1442         ret = 0;
1443
1444  out:
1445         vfree(regbuf);
1446         return ret;
1447 }
1448
1449 static int ethtool_reset(struct net_device *dev, char __user *useraddr)
1450 {
1451         struct ethtool_value reset;
1452         int ret;
1453
1454         if (!dev->ethtool_ops->reset)
1455                 return -EOPNOTSUPP;
1456
1457         if (copy_from_user(&reset, useraddr, sizeof(reset)))
1458                 return -EFAULT;
1459
1460         ret = dev->ethtool_ops->reset(dev, &reset.data);
1461         if (ret)
1462                 return ret;
1463
1464         if (copy_to_user(useraddr, &reset, sizeof(reset)))
1465                 return -EFAULT;
1466         return 0;
1467 }
1468
1469 static int ethtool_get_wol(struct net_device *dev, char __user *useraddr)
1470 {
1471         struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
1472
1473         if (!dev->ethtool_ops->get_wol)
1474                 return -EOPNOTSUPP;
1475
1476         dev->ethtool_ops->get_wol(dev, &wol);
1477
1478         if (copy_to_user(useraddr, &wol, sizeof(wol)))
1479                 return -EFAULT;
1480         return 0;
1481 }
1482
1483 static int ethtool_set_wol(struct net_device *dev, char __user *useraddr)
1484 {
1485         struct ethtool_wolinfo wol;
1486
1487         if (!dev->ethtool_ops->set_wol)
1488                 return -EOPNOTSUPP;
1489
1490         if (copy_from_user(&wol, useraddr, sizeof(wol)))
1491                 return -EFAULT;
1492
1493         return dev->ethtool_ops->set_wol(dev, &wol);
1494 }
1495
1496 static int ethtool_get_eee(struct net_device *dev, char __user *useraddr)
1497 {
1498         struct ethtool_eee edata;
1499         int rc;
1500
1501         if (!dev->ethtool_ops->get_eee)
1502                 return -EOPNOTSUPP;
1503
1504         memset(&edata, 0, sizeof(struct ethtool_eee));
1505         edata.cmd = ETHTOOL_GEEE;
1506         rc = dev->ethtool_ops->get_eee(dev, &edata);
1507
1508         if (rc)
1509                 return rc;
1510
1511         if (copy_to_user(useraddr, &edata, sizeof(edata)))
1512                 return -EFAULT;
1513
1514         return 0;
1515 }
1516
1517 static int ethtool_set_eee(struct net_device *dev, char __user *useraddr)
1518 {
1519         struct ethtool_eee edata;
1520
1521         if (!dev->ethtool_ops->set_eee)
1522                 return -EOPNOTSUPP;
1523
1524         if (copy_from_user(&edata, useraddr, sizeof(edata)))
1525                 return -EFAULT;
1526
1527         return dev->ethtool_ops->set_eee(dev, &edata);
1528 }
1529
1530 static int ethtool_nway_reset(struct net_device *dev)
1531 {
1532         if (!dev->ethtool_ops->nway_reset)
1533                 return -EOPNOTSUPP;
1534
1535         return dev->ethtool_ops->nway_reset(dev);
1536 }
1537
1538 static int ethtool_get_link(struct net_device *dev, char __user *useraddr)
1539 {
1540         struct ethtool_value edata = { .cmd = ETHTOOL_GLINK };
1541
1542         if (!dev->ethtool_ops->get_link)
1543                 return -EOPNOTSUPP;
1544
1545         edata.data = netif_running(dev) && dev->ethtool_ops->get_link(dev);
1546
1547         if (copy_to_user(useraddr, &edata, sizeof(edata)))
1548                 return -EFAULT;
1549         return 0;
1550 }
1551
1552 static int ethtool_get_any_eeprom(struct net_device *dev, void __user *useraddr,
1553                                   int (*getter)(struct net_device *,
1554                                                 struct ethtool_eeprom *, u8 *),
1555                                   u32 total_len)
1556 {
1557         struct ethtool_eeprom eeprom;
1558         void __user *userbuf = useraddr + sizeof(eeprom);
1559         u32 bytes_remaining;
1560         u8 *data;
1561         int ret = 0;
1562
1563         if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
1564                 return -EFAULT;
1565
1566         /* Check for wrap and zero */
1567         if (eeprom.offset + eeprom.len <= eeprom.offset)
1568                 return -EINVAL;
1569
1570         /* Check for exceeding total eeprom len */
1571         if (eeprom.offset + eeprom.len > total_len)
1572                 return -EINVAL;
1573
1574         data = kmalloc(PAGE_SIZE, GFP_USER);
1575         if (!data)
1576                 return -ENOMEM;
1577
1578         bytes_remaining = eeprom.len;
1579         while (bytes_remaining > 0) {
1580                 eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);
1581
1582                 ret = getter(dev, &eeprom, data);
1583                 if (ret)
1584                         break;
1585                 if (copy_to_user(userbuf, data, eeprom.len)) {
1586                         ret = -EFAULT;
1587                         break;
1588                 }
1589                 userbuf += eeprom.len;
1590                 eeprom.offset += eeprom.len;
1591                 bytes_remaining -= eeprom.len;
1592         }
1593
1594         eeprom.len = userbuf - (useraddr + sizeof(eeprom));
1595         eeprom.offset -= eeprom.len;
1596         if (copy_to_user(useraddr, &eeprom, sizeof(eeprom)))
1597                 ret = -EFAULT;
1598
1599         kfree(data);
1600         return ret;
1601 }
1602
1603 static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
1604 {
1605         const struct ethtool_ops *ops = dev->ethtool_ops;
1606
1607         if (!ops->get_eeprom || !ops->get_eeprom_len ||
1608             !ops->get_eeprom_len(dev))
1609                 return -EOPNOTSUPP;
1610
1611         return ethtool_get_any_eeprom(dev, useraddr, ops->get_eeprom,
1612                                       ops->get_eeprom_len(dev));
1613 }
1614
1615 static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
1616 {
1617         struct ethtool_eeprom eeprom;
1618         const struct ethtool_ops *ops = dev->ethtool_ops;
1619         void __user *userbuf = useraddr + sizeof(eeprom);
1620         u32 bytes_remaining;
1621         u8 *data;
1622         int ret = 0;
1623
1624         if (!ops->set_eeprom || !ops->get_eeprom_len ||
1625             !ops->get_eeprom_len(dev))
1626                 return -EOPNOTSUPP;
1627
1628         if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
1629                 return -EFAULT;
1630
1631         /* Check for wrap and zero */
1632         if (eeprom.offset + eeprom.len <= eeprom.offset)
1633                 return -EINVAL;
1634
1635         /* Check for exceeding total eeprom len */
1636         if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
1637                 return -EINVAL;
1638
1639         data = kmalloc(PAGE_SIZE, GFP_USER);
1640         if (!data)
1641                 return -ENOMEM;
1642
1643         bytes_remaining = eeprom.len;
1644         while (bytes_remaining > 0) {
1645                 eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);
1646
1647                 if (copy_from_user(data, userbuf, eeprom.len)) {
1648                         ret = -EFAULT;
1649                         break;
1650                 }
1651                 ret = ops->set_eeprom(dev, &eeprom, data);
1652                 if (ret)
1653                         break;
1654                 userbuf += eeprom.len;
1655                 eeprom.offset += eeprom.len;
1656                 bytes_remaining -= eeprom.len;
1657         }
1658
1659         kfree(data);
1660         return ret;
1661 }
1662
1663 static noinline_for_stack int ethtool_get_coalesce(struct net_device *dev,
1664                                                    void __user *useraddr)
1665 {
1666         struct ethtool_coalesce coalesce = { .cmd = ETHTOOL_GCOALESCE };
1667
1668         if (!dev->ethtool_ops->get_coalesce)
1669                 return -EOPNOTSUPP;
1670
1671         dev->ethtool_ops->get_coalesce(dev, &coalesce);
1672
1673         if (copy_to_user(useraddr, &coalesce, sizeof(coalesce)))
1674                 return -EFAULT;
1675         return 0;
1676 }
1677
1678 static noinline_for_stack int ethtool_set_coalesce(struct net_device *dev,
1679                                                    void __user *useraddr)
1680 {
1681         struct ethtool_coalesce coalesce;
1682
1683         if (!dev->ethtool_ops->set_coalesce)
1684                 return -EOPNOTSUPP;
1685
1686         if (copy_from_user(&coalesce, useraddr, sizeof(coalesce)))
1687                 return -EFAULT;
1688
1689         return dev->ethtool_ops->set_coalesce(dev, &coalesce);
1690 }
1691
1692 static int ethtool_get_ringparam(struct net_device *dev, void __user *useraddr)
1693 {
1694         struct ethtool_ringparam ringparam = { .cmd = ETHTOOL_GRINGPARAM };
1695
1696         if (!dev->ethtool_ops->get_ringparam)
1697                 return -EOPNOTSUPP;
1698
1699         dev->ethtool_ops->get_ringparam(dev, &ringparam);
1700
1701         if (copy_to_user(useraddr, &ringparam, sizeof(ringparam)))
1702                 return -EFAULT;
1703         return 0;
1704 }
1705
1706 static int ethtool_set_ringparam(struct net_device *dev, void __user *useraddr)
1707 {
1708         struct ethtool_ringparam ringparam, max = { .cmd = ETHTOOL_GRINGPARAM };
1709
1710         if (!dev->ethtool_ops->set_ringparam || !dev->ethtool_ops->get_ringparam)
1711                 return -EOPNOTSUPP;
1712
1713         if (copy_from_user(&ringparam, useraddr, sizeof(ringparam)))
1714                 return -EFAULT;
1715
1716         dev->ethtool_ops->get_ringparam(dev, &max);
1717
1718         /* ensure new ring parameters are within the maximums */
1719         if (ringparam.rx_pending > max.rx_max_pending ||
1720             ringparam.rx_mini_pending > max.rx_mini_max_pending ||
1721             ringparam.rx_jumbo_pending > max.rx_jumbo_max_pending ||
1722             ringparam.tx_pending > max.tx_max_pending)
1723                 return -EINVAL;
1724
1725         return dev->ethtool_ops->set_ringparam(dev, &ringparam);
1726 }
1727
1728 static noinline_for_stack int ethtool_get_channels(struct net_device *dev,
1729                                                    void __user *useraddr)
1730 {
1731         struct ethtool_channels channels = { .cmd = ETHTOOL_GCHANNELS };
1732
1733         if (!dev->ethtool_ops->get_channels)
1734                 return -EOPNOTSUPP;
1735
1736         dev->ethtool_ops->get_channels(dev, &channels);
1737
1738         if (copy_to_user(useraddr, &channels, sizeof(channels)))
1739                 return -EFAULT;
1740         return 0;
1741 }
1742
1743 static noinline_for_stack int ethtool_set_channels(struct net_device *dev,
1744                                                    void __user *useraddr)
1745 {
1746         struct ethtool_channels channels, max = { .cmd = ETHTOOL_GCHANNELS };
1747         u32 max_rx_in_use = 0;
1748
1749         if (!dev->ethtool_ops->set_channels || !dev->ethtool_ops->get_channels)
1750                 return -EOPNOTSUPP;
1751
1752         if (copy_from_user(&channels, useraddr, sizeof(channels)))
1753                 return -EFAULT;
1754
1755         dev->ethtool_ops->get_channels(dev, &max);
1756
1757         /* ensure new counts are within the maximums */
1758         if ((channels.rx_count > max.max_rx) ||
1759             (channels.tx_count > max.max_tx) ||
1760             (channels.combined_count > max.max_combined) ||
1761             (channels.other_count > max.max_other))
1762                 return -EINVAL;
1763
1764         /* ensure the new Rx count fits within the configured Rx flow
1765          * indirection table settings */
1766         if (netif_is_rxfh_configured(dev) &&
1767             !ethtool_get_max_rxfh_channel(dev, &max_rx_in_use) &&
1768             (channels.combined_count + channels.rx_count) <= max_rx_in_use)
1769             return -EINVAL;
1770
1771         return dev->ethtool_ops->set_channels(dev, &channels);
1772 }
1773
1774 static int ethtool_get_pauseparam(struct net_device *dev, void __user *useraddr)
1775 {
1776         struct ethtool_pauseparam pauseparam = { ETHTOOL_GPAUSEPARAM };
1777
1778         if (!dev->ethtool_ops->get_pauseparam)
1779                 return -EOPNOTSUPP;
1780
1781         dev->ethtool_ops->get_pauseparam(dev, &pauseparam);
1782
1783         if (copy_to_user(useraddr, &pauseparam, sizeof(pauseparam)))
1784                 return -EFAULT;
1785         return 0;
1786 }
1787
1788 static int ethtool_set_pauseparam(struct net_device *dev, void __user *useraddr)
1789 {
1790         struct ethtool_pauseparam pauseparam;
1791
1792         if (!dev->ethtool_ops->set_pauseparam)
1793                 return -EOPNOTSUPP;
1794
1795         if (copy_from_user(&pauseparam, useraddr, sizeof(pauseparam)))
1796                 return -EFAULT;
1797
1798         return dev->ethtool_ops->set_pauseparam(dev, &pauseparam);
1799 }
1800
1801 static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
1802 {
1803         struct ethtool_test test;
1804         const struct ethtool_ops *ops = dev->ethtool_ops;
1805         u64 *data;
1806         int ret, test_len;
1807
1808         if (!ops->self_test || !ops->get_sset_count)
1809                 return -EOPNOTSUPP;
1810
1811         test_len = ops->get_sset_count(dev, ETH_SS_TEST);
1812         if (test_len < 0)
1813                 return test_len;
1814         WARN_ON(test_len == 0);
1815
1816         if (copy_from_user(&test, useraddr, sizeof(test)))
1817                 return -EFAULT;
1818
1819         test.len = test_len;
1820         data = kmalloc_array(test_len, sizeof(u64), GFP_USER);
1821         if (!data)
1822                 return -ENOMEM;
1823
1824         ops->self_test(dev, &test, data);
1825
1826         ret = -EFAULT;
1827         if (copy_to_user(useraddr, &test, sizeof(test)))
1828                 goto out;
1829         useraddr += sizeof(test);
1830         if (copy_to_user(useraddr, data, test.len * sizeof(u64)))
1831                 goto out;
1832         ret = 0;
1833
1834  out:
1835         kfree(data);
1836         return ret;
1837 }
1838
1839 static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
1840 {
1841         struct ethtool_gstrings gstrings;
1842         u8 *data;
1843         int ret;
1844
1845         if (copy_from_user(&gstrings, useraddr, sizeof(gstrings)))
1846                 return -EFAULT;
1847
1848         ret = __ethtool_get_sset_count(dev, gstrings.string_set);
1849         if (ret < 0)
1850                 return ret;
1851         if (ret > S32_MAX / ETH_GSTRING_LEN)
1852                 return -ENOMEM;
1853         WARN_ON_ONCE(!ret);
1854
1855         gstrings.len = ret;
1856         data = vzalloc(array_size(gstrings.len, ETH_GSTRING_LEN));
1857         if (gstrings.len && !data)
1858                 return -ENOMEM;
1859
1860         __ethtool_get_strings(dev, gstrings.string_set, data);
1861
1862         ret = -EFAULT;
1863         if (copy_to_user(useraddr, &gstrings, sizeof(gstrings)))
1864                 goto out;
1865         useraddr += sizeof(gstrings);
1866         if (gstrings.len &&
1867             copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))
1868                 goto out;
1869         ret = 0;
1870
1871 out:
1872         vfree(data);
1873         return ret;
1874 }
1875
1876 static int ethtool_phys_id(struct net_device *dev, void __user *useraddr)
1877 {
1878         struct ethtool_value id;
1879         static bool busy;
1880         const struct ethtool_ops *ops = dev->ethtool_ops;
1881         int rc;
1882
1883         if (!ops->set_phys_id)
1884                 return -EOPNOTSUPP;
1885
1886         if (busy)
1887                 return -EBUSY;
1888
1889         if (copy_from_user(&id, useraddr, sizeof(id)))
1890                 return -EFAULT;
1891
1892         rc = ops->set_phys_id(dev, ETHTOOL_ID_ACTIVE);
1893         if (rc < 0)
1894                 return rc;
1895
1896         /* Drop the RTNL lock while waiting, but prevent reentry or
1897          * removal of the device.
1898          */
1899         busy = true;
1900         dev_hold(dev);
1901         rtnl_unlock();
1902
1903         if (rc == 0) {
1904                 /* Driver will handle this itself */
1905                 schedule_timeout_interruptible(
1906                         id.data ? (id.data * HZ) : MAX_SCHEDULE_TIMEOUT);
1907         } else {
1908                 /* Driver expects to be called at twice the frequency in rc */
1909                 int n = rc * 2, i, interval = HZ / n;
1910
1911                 /* Count down seconds */
1912                 do {
1913                         /* Count down iterations per second */
1914                         i = n;
1915                         do {
1916                                 rtnl_lock();
1917                                 rc = ops->set_phys_id(dev,
1918                                     (i & 1) ? ETHTOOL_ID_OFF : ETHTOOL_ID_ON);
1919                                 rtnl_unlock();
1920                                 if (rc)
1921                                         break;
1922                                 schedule_timeout_interruptible(interval);
1923                         } while (!signal_pending(current) && --i != 0);
1924                 } while (!signal_pending(current) &&
1925                          (id.data == 0 || --id.data != 0));
1926         }
1927
1928         rtnl_lock();
1929         dev_put(dev);
1930         busy = false;
1931
1932         (void) ops->set_phys_id(dev, ETHTOOL_ID_INACTIVE);
1933         return rc;
1934 }
1935
1936 static int ethtool_get_stats(struct net_device *dev, void __user *useraddr)
1937 {
1938         struct ethtool_stats stats;
1939         const struct ethtool_ops *ops = dev->ethtool_ops;
1940         u64 *data;
1941         int ret, n_stats;
1942
1943         if (!ops->get_ethtool_stats || !ops->get_sset_count)
1944                 return -EOPNOTSUPP;
1945
1946         n_stats = ops->get_sset_count(dev, ETH_SS_STATS);
1947         if (n_stats < 0)
1948                 return n_stats;
1949         if (n_stats > S32_MAX / sizeof(u64))
1950                 return -ENOMEM;
1951         WARN_ON_ONCE(!n_stats);
1952         if (copy_from_user(&stats, useraddr, sizeof(stats)))
1953                 return -EFAULT;
1954
1955         stats.n_stats = n_stats;
1956         data = vzalloc(array_size(n_stats, sizeof(u64)));
1957         if (n_stats && !data)
1958                 return -ENOMEM;
1959
1960         ops->get_ethtool_stats(dev, &stats, data);
1961
1962         ret = -EFAULT;
1963         if (copy_to_user(useraddr, &stats, sizeof(stats)))
1964                 goto out;
1965         useraddr += sizeof(stats);
1966         if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
1967                 goto out;
1968         ret = 0;
1969
1970  out:
1971         vfree(data);
1972         return ret;
1973 }
1974
1975 static int ethtool_get_phy_stats(struct net_device *dev, void __user *useraddr)
1976 {
1977         const struct ethtool_ops *ops = dev->ethtool_ops;
1978         struct phy_device *phydev = dev->phydev;
1979         struct ethtool_stats stats;
1980         u64 *data;
1981         int ret, n_stats;
1982
1983         if (!phydev && (!ops->get_ethtool_phy_stats || !ops->get_sset_count))
1984                 return -EOPNOTSUPP;
1985
1986         if (dev->phydev && !ops->get_ethtool_phy_stats)
1987                 n_stats = phy_ethtool_get_sset_count(dev->phydev);
1988         else
1989                 n_stats = ops->get_sset_count(dev, ETH_SS_PHY_STATS);
1990         if (n_stats < 0)
1991                 return n_stats;
1992         if (n_stats > S32_MAX / sizeof(u64))
1993                 return -ENOMEM;
1994         WARN_ON_ONCE(!n_stats);
1995
1996         if (copy_from_user(&stats, useraddr, sizeof(stats)))
1997                 return -EFAULT;
1998
1999         stats.n_stats = n_stats;
2000         data = vzalloc(array_size(n_stats, sizeof(u64)));
2001         if (n_stats && !data)
2002                 return -ENOMEM;
2003
2004         if (dev->phydev && !ops->get_ethtool_phy_stats) {
2005                 ret = phy_ethtool_get_stats(dev->phydev, &stats, data);
2006                 if (ret < 0)
2007                         return ret;
2008         } else {
2009                 ops->get_ethtool_phy_stats(dev, &stats, data);
2010         }
2011
2012         ret = -EFAULT;
2013         if (copy_to_user(useraddr, &stats, sizeof(stats)))
2014                 goto out;
2015         useraddr += sizeof(stats);
2016         if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
2017                 goto out;
2018         ret = 0;
2019
2020  out:
2021         vfree(data);
2022         return ret;
2023 }
2024
2025 static int ethtool_get_perm_addr(struct net_device *dev, void __user *useraddr)
2026 {
2027         struct ethtool_perm_addr epaddr;
2028
2029         if (copy_from_user(&epaddr, useraddr, sizeof(epaddr)))
2030                 return -EFAULT;
2031
2032         if (epaddr.size < dev->addr_len)
2033                 return -ETOOSMALL;
2034         epaddr.size = dev->addr_len;
2035
2036         if (copy_to_user(useraddr, &epaddr, sizeof(epaddr)))
2037                 return -EFAULT;
2038         useraddr += sizeof(epaddr);
2039         if (copy_to_user(useraddr, dev->perm_addr, epaddr.size))
2040                 return -EFAULT;
2041         return 0;
2042 }
2043
2044 static int ethtool_get_value(struct net_device *dev, char __user *useraddr,
2045                              u32 cmd, u32 (*actor)(struct net_device *))
2046 {
2047         struct ethtool_value edata = { .cmd = cmd };
2048
2049         if (!actor)
2050                 return -EOPNOTSUPP;
2051
2052         edata.data = actor(dev);
2053
2054         if (copy_to_user(useraddr, &edata, sizeof(edata)))
2055                 return -EFAULT;
2056         return 0;
2057 }
2058
2059 static int ethtool_set_value_void(struct net_device *dev, char __user *useraddr,
2060                              void (*actor)(struct net_device *, u32))
2061 {
2062         struct ethtool_value edata;
2063
2064         if (!actor)
2065                 return -EOPNOTSUPP;
2066
2067         if (copy_from_user(&edata, useraddr, sizeof(edata)))
2068                 return -EFAULT;
2069
2070         actor(dev, edata.data);
2071         return 0;
2072 }
2073
2074 static int ethtool_set_value(struct net_device *dev, char __user *useraddr,
2075                              int (*actor)(struct net_device *, u32))
2076 {
2077         struct ethtool_value edata;
2078
2079         if (!actor)
2080                 return -EOPNOTSUPP;
2081
2082         if (copy_from_user(&edata, useraddr, sizeof(edata)))
2083                 return -EFAULT;
2084
2085         return actor(dev, edata.data);
2086 }
2087
2088 static noinline_for_stack int ethtool_flash_device(struct net_device *dev,
2089                                                    char __user *useraddr)
2090 {
2091         struct ethtool_flash efl;
2092
2093         if (copy_from_user(&efl, useraddr, sizeof(efl)))
2094                 return -EFAULT;
2095
2096         if (!dev->ethtool_ops->flash_device)
2097                 return -EOPNOTSUPP;
2098
2099         efl.data[ETHTOOL_FLASH_MAX_FILENAME - 1] = 0;
2100
2101         return dev->ethtool_ops->flash_device(dev, &efl);
2102 }
2103
2104 static int ethtool_set_dump(struct net_device *dev,
2105                         void __user *useraddr)
2106 {
2107         struct ethtool_dump dump;
2108
2109         if (!dev->ethtool_ops->set_dump)
2110                 return -EOPNOTSUPP;
2111
2112         if (copy_from_user(&dump, useraddr, sizeof(dump)))
2113                 return -EFAULT;
2114
2115         return dev->ethtool_ops->set_dump(dev, &dump);
2116 }
2117
2118 static int ethtool_get_dump_flag(struct net_device *dev,
2119                                 void __user *useraddr)
2120 {
2121         int ret;
2122         struct ethtool_dump dump;
2123         const struct ethtool_ops *ops = dev->ethtool_ops;
2124
2125         if (!ops->get_dump_flag)
2126                 return -EOPNOTSUPP;
2127
2128         if (copy_from_user(&dump, useraddr, sizeof(dump)))
2129                 return -EFAULT;
2130
2131         ret = ops->get_dump_flag(dev, &dump);
2132         if (ret)
2133                 return ret;
2134
2135         if (copy_to_user(useraddr, &dump, sizeof(dump)))
2136                 return -EFAULT;
2137         return 0;
2138 }
2139
2140 static int ethtool_get_dump_data(struct net_device *dev,
2141                                 void __user *useraddr)
2142 {
2143         int ret;
2144         __u32 len;
2145         struct ethtool_dump dump, tmp;
2146         const struct ethtool_ops *ops = dev->ethtool_ops;
2147         void *data = NULL;
2148
2149         if (!ops->get_dump_data || !ops->get_dump_flag)
2150                 return -EOPNOTSUPP;
2151
2152         if (copy_from_user(&dump, useraddr, sizeof(dump)))
2153                 return -EFAULT;
2154
2155         memset(&tmp, 0, sizeof(tmp));
2156         tmp.cmd = ETHTOOL_GET_DUMP_FLAG;
2157         ret = ops->get_dump_flag(dev, &tmp);
2158         if (ret)
2159                 return ret;
2160
2161         len = min(tmp.len, dump.len);
2162         if (!len)
2163                 return -EFAULT;
2164
2165         /* Don't ever let the driver think there's more space available
2166          * than it requested with .get_dump_flag().
2167          */
2168         dump.len = len;
2169
2170         /* Always allocate enough space to hold the whole thing so that the
2171          * driver does not need to check the length and bother with partial
2172          * dumping.
2173          */
2174         data = vzalloc(tmp.len);
2175         if (!data)
2176                 return -ENOMEM;
2177         ret = ops->get_dump_data(dev, &dump, data);
2178         if (ret)
2179                 goto out;
2180
2181         /* There are two sane possibilities:
2182          * 1. The driver's .get_dump_data() does not touch dump.len.
2183          * 2. Or it may set dump.len to how much it really writes, which
2184          *    should be tmp.len (or len if it can do a partial dump).
2185          * In any case respond to userspace with the actual length of data
2186          * it's receiving.
2187          */
2188         WARN_ON(dump.len != len && dump.len != tmp.len);
2189         dump.len = len;
2190
2191         if (copy_to_user(useraddr, &dump, sizeof(dump))) {
2192                 ret = -EFAULT;
2193                 goto out;
2194         }
2195         useraddr += offsetof(struct ethtool_dump, data);
2196         if (copy_to_user(useraddr, data, len))
2197                 ret = -EFAULT;
2198 out:
2199         vfree(data);
2200         return ret;
2201 }
2202
2203 static int ethtool_get_ts_info(struct net_device *dev, void __user *useraddr)
2204 {
2205         int err = 0;
2206         struct ethtool_ts_info info;
2207         const struct ethtool_ops *ops = dev->ethtool_ops;
2208         struct phy_device *phydev = dev->phydev;
2209
2210         memset(&info, 0, sizeof(info));
2211         info.cmd = ETHTOOL_GET_TS_INFO;
2212
2213         if (phydev && phydev->drv && phydev->drv->ts_info) {
2214                 err = phydev->drv->ts_info(phydev, &info);
2215         } else if (ops->get_ts_info) {
2216                 err = ops->get_ts_info(dev, &info);
2217         } else {
2218                 info.so_timestamping =
2219                         SOF_TIMESTAMPING_RX_SOFTWARE |
2220                         SOF_TIMESTAMPING_SOFTWARE;
2221                 info.phc_index = -1;
2222         }
2223
2224         if (err)
2225                 return err;
2226
2227         if (copy_to_user(useraddr, &info, sizeof(info)))
2228                 err = -EFAULT;
2229
2230         return err;
2231 }
2232
2233 static int __ethtool_get_module_info(struct net_device *dev,
2234                                      struct ethtool_modinfo *modinfo)
2235 {
2236         const struct ethtool_ops *ops = dev->ethtool_ops;
2237         struct phy_device *phydev = dev->phydev;
2238
2239         if (dev->sfp_bus)
2240                 return sfp_get_module_info(dev->sfp_bus, modinfo);
2241
2242         if (phydev && phydev->drv && phydev->drv->module_info)
2243                 return phydev->drv->module_info(phydev, modinfo);
2244
2245         if (ops->get_module_info)
2246                 return ops->get_module_info(dev, modinfo);
2247
2248         return -EOPNOTSUPP;
2249 }
2250
2251 static int ethtool_get_module_info(struct net_device *dev,
2252                                    void __user *useraddr)
2253 {
2254         int ret;
2255         struct ethtool_modinfo modinfo;
2256
2257         if (copy_from_user(&modinfo, useraddr, sizeof(modinfo)))
2258                 return -EFAULT;
2259
2260         ret = __ethtool_get_module_info(dev, &modinfo);
2261         if (ret)
2262                 return ret;
2263
2264         if (copy_to_user(useraddr, &modinfo, sizeof(modinfo)))
2265                 return -EFAULT;
2266
2267         return 0;
2268 }
2269
2270 static int __ethtool_get_module_eeprom(struct net_device *dev,
2271                                        struct ethtool_eeprom *ee, u8 *data)
2272 {
2273         const struct ethtool_ops *ops = dev->ethtool_ops;
2274         struct phy_device *phydev = dev->phydev;
2275
2276         if (dev->sfp_bus)
2277                 return sfp_get_module_eeprom(dev->sfp_bus, ee, data);
2278
2279         if (phydev && phydev->drv && phydev->drv->module_eeprom)
2280                 return phydev->drv->module_eeprom(phydev, ee, data);
2281
2282         if (ops->get_module_eeprom)
2283                 return ops->get_module_eeprom(dev, ee, data);
2284
2285         return -EOPNOTSUPP;
2286 }
2287
2288 static int ethtool_get_module_eeprom(struct net_device *dev,
2289                                      void __user *useraddr)
2290 {
2291         int ret;
2292         struct ethtool_modinfo modinfo;
2293
2294         ret = __ethtool_get_module_info(dev, &modinfo);
2295         if (ret)
2296                 return ret;
2297
2298         return ethtool_get_any_eeprom(dev, useraddr,
2299                                       __ethtool_get_module_eeprom,
2300                                       modinfo.eeprom_len);
2301 }
2302
2303 static int ethtool_tunable_valid(const struct ethtool_tunable *tuna)
2304 {
2305         switch (tuna->id) {
2306         case ETHTOOL_RX_COPYBREAK:
2307         case ETHTOOL_TX_COPYBREAK:
2308                 if (tuna->len != sizeof(u32) ||
2309                     tuna->type_id != ETHTOOL_TUNABLE_U32)
2310                         return -EINVAL;
2311                 break;
2312         case ETHTOOL_PFC_PREVENTION_TOUT:
2313                 if (tuna->len != sizeof(u16) ||
2314                     tuna->type_id != ETHTOOL_TUNABLE_U16)
2315                         return -EINVAL;
2316                 break;
2317         default:
2318                 return -EINVAL;
2319         }
2320
2321         return 0;
2322 }
2323
2324 static int ethtool_get_tunable(struct net_device *dev, void __user *useraddr)
2325 {
2326         int ret;
2327         struct ethtool_tunable tuna;
2328         const struct ethtool_ops *ops = dev->ethtool_ops;
2329         void *data;
2330
2331         if (!ops->get_tunable)
2332                 return -EOPNOTSUPP;
2333         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2334                 return -EFAULT;
2335         ret = ethtool_tunable_valid(&tuna);
2336         if (ret)
2337                 return ret;
2338         data = kmalloc(tuna.len, GFP_USER);
2339         if (!data)
2340                 return -ENOMEM;
2341         ret = ops->get_tunable(dev, &tuna, data);
2342         if (ret)
2343                 goto out;
2344         useraddr += sizeof(tuna);
2345         ret = -EFAULT;
2346         if (copy_to_user(useraddr, data, tuna.len))
2347                 goto out;
2348         ret = 0;
2349
2350 out:
2351         kfree(data);
2352         return ret;
2353 }
2354
2355 static int ethtool_set_tunable(struct net_device *dev, void __user *useraddr)
2356 {
2357         int ret;
2358         struct ethtool_tunable tuna;
2359         const struct ethtool_ops *ops = dev->ethtool_ops;
2360         void *data;
2361
2362         if (!ops->set_tunable)
2363                 return -EOPNOTSUPP;
2364         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2365                 return -EFAULT;
2366         ret = ethtool_tunable_valid(&tuna);
2367         if (ret)
2368                 return ret;
2369         useraddr += sizeof(tuna);
2370         data = memdup_user(useraddr, tuna.len);
2371         if (IS_ERR(data))
2372                 return PTR_ERR(data);
2373         ret = ops->set_tunable(dev, &tuna, data);
2374
2375         kfree(data);
2376         return ret;
2377 }
2378
2379 static int ethtool_get_per_queue_coalesce(struct net_device *dev,
2380                                           void __user *useraddr,
2381                                           struct ethtool_per_queue_op *per_queue_opt)
2382 {
2383         u32 bit;
2384         int ret;
2385         DECLARE_BITMAP(queue_mask, MAX_NUM_QUEUE);
2386
2387         if (!dev->ethtool_ops->get_per_queue_coalesce)
2388                 return -EOPNOTSUPP;
2389
2390         useraddr += sizeof(*per_queue_opt);
2391
2392         bitmap_from_arr32(queue_mask, per_queue_opt->queue_mask,
2393                           MAX_NUM_QUEUE);
2394
2395         for_each_set_bit(bit, queue_mask, MAX_NUM_QUEUE) {
2396                 struct ethtool_coalesce coalesce = { .cmd = ETHTOOL_GCOALESCE };
2397
2398                 ret = dev->ethtool_ops->get_per_queue_coalesce(dev, bit, &coalesce);
2399                 if (ret != 0)
2400                         return ret;
2401                 if (copy_to_user(useraddr, &coalesce, sizeof(coalesce)))
2402                         return -EFAULT;
2403                 useraddr += sizeof(coalesce);
2404         }
2405
2406         return 0;
2407 }
2408
2409 static int ethtool_set_per_queue_coalesce(struct net_device *dev,
2410                                           void __user *useraddr,
2411                                           struct ethtool_per_queue_op *per_queue_opt)
2412 {
2413         u32 bit;
2414         int i, ret = 0;
2415         int n_queue;
2416         struct ethtool_coalesce *backup = NULL, *tmp = NULL;
2417         DECLARE_BITMAP(queue_mask, MAX_NUM_QUEUE);
2418
2419         if ((!dev->ethtool_ops->set_per_queue_coalesce) ||
2420             (!dev->ethtool_ops->get_per_queue_coalesce))
2421                 return -EOPNOTSUPP;
2422
2423         useraddr += sizeof(*per_queue_opt);
2424
2425         bitmap_from_arr32(queue_mask, per_queue_opt->queue_mask, MAX_NUM_QUEUE);
2426         n_queue = bitmap_weight(queue_mask, MAX_NUM_QUEUE);
2427         tmp = backup = kmalloc_array(n_queue, sizeof(*backup), GFP_KERNEL);
2428         if (!backup)
2429                 return -ENOMEM;
2430
2431         for_each_set_bit(bit, queue_mask, MAX_NUM_QUEUE) {
2432                 struct ethtool_coalesce coalesce;
2433
2434                 ret = dev->ethtool_ops->get_per_queue_coalesce(dev, bit, tmp);
2435                 if (ret != 0)
2436                         goto roll_back;
2437
2438                 tmp++;
2439
2440                 if (copy_from_user(&coalesce, useraddr, sizeof(coalesce))) {
2441                         ret = -EFAULT;
2442                         goto roll_back;
2443                 }
2444
2445                 ret = dev->ethtool_ops->set_per_queue_coalesce(dev, bit, &coalesce);
2446                 if (ret != 0)
2447                         goto roll_back;
2448
2449                 useraddr += sizeof(coalesce);
2450         }
2451
2452 roll_back:
2453         if (ret != 0) {
2454                 tmp = backup;
2455                 for_each_set_bit(i, queue_mask, bit) {
2456                         dev->ethtool_ops->set_per_queue_coalesce(dev, i, tmp);
2457                         tmp++;
2458                 }
2459         }
2460         kfree(backup);
2461
2462         return ret;
2463 }
2464
2465 static int ethtool_set_per_queue(struct net_device *dev, void __user *useraddr)
2466 {
2467         struct ethtool_per_queue_op per_queue_opt;
2468
2469         if (copy_from_user(&per_queue_opt, useraddr, sizeof(per_queue_opt)))
2470                 return -EFAULT;
2471
2472         switch (per_queue_opt.sub_command) {
2473         case ETHTOOL_GCOALESCE:
2474                 return ethtool_get_per_queue_coalesce(dev, useraddr, &per_queue_opt);
2475         case ETHTOOL_SCOALESCE:
2476                 return ethtool_set_per_queue_coalesce(dev, useraddr, &per_queue_opt);
2477         default:
2478                 return -EOPNOTSUPP;
2479         };
2480 }
2481
2482 static int ethtool_phy_tunable_valid(const struct ethtool_tunable *tuna)
2483 {
2484         switch (tuna->id) {
2485         case ETHTOOL_PHY_DOWNSHIFT:
2486                 if (tuna->len != sizeof(u8) ||
2487                     tuna->type_id != ETHTOOL_TUNABLE_U8)
2488                         return -EINVAL;
2489                 break;
2490         default:
2491                 return -EINVAL;
2492         }
2493
2494         return 0;
2495 }
2496
2497 static int get_phy_tunable(struct net_device *dev, void __user *useraddr)
2498 {
2499         int ret;
2500         struct ethtool_tunable tuna;
2501         struct phy_device *phydev = dev->phydev;
2502         void *data;
2503
2504         if (!(phydev && phydev->drv && phydev->drv->get_tunable))
2505                 return -EOPNOTSUPP;
2506
2507         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2508                 return -EFAULT;
2509         ret = ethtool_phy_tunable_valid(&tuna);
2510         if (ret)
2511                 return ret;
2512         data = kmalloc(tuna.len, GFP_USER);
2513         if (!data)
2514                 return -ENOMEM;
2515         mutex_lock(&phydev->lock);
2516         ret = phydev->drv->get_tunable(phydev, &tuna, data);
2517         mutex_unlock(&phydev->lock);
2518         if (ret)
2519                 goto out;
2520         useraddr += sizeof(tuna);
2521         ret = -EFAULT;
2522         if (copy_to_user(useraddr, data, tuna.len))
2523                 goto out;
2524         ret = 0;
2525
2526 out:
2527         kfree(data);
2528         return ret;
2529 }
2530
2531 static int set_phy_tunable(struct net_device *dev, void __user *useraddr)
2532 {
2533         int ret;
2534         struct ethtool_tunable tuna;
2535         struct phy_device *phydev = dev->phydev;
2536         void *data;
2537
2538         if (!(phydev && phydev->drv && phydev->drv->set_tunable))
2539                 return -EOPNOTSUPP;
2540         if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
2541                 return -EFAULT;
2542         ret = ethtool_phy_tunable_valid(&tuna);
2543         if (ret)
2544                 return ret;
2545         useraddr += sizeof(tuna);
2546         data = memdup_user(useraddr, tuna.len);
2547         if (IS_ERR(data))
2548                 return PTR_ERR(data);
2549         mutex_lock(&phydev->lock);
2550         ret = phydev->drv->set_tunable(phydev, &tuna, data);
2551         mutex_unlock(&phydev->lock);
2552
2553         kfree(data);
2554         return ret;
2555 }
2556
2557 static int ethtool_get_fecparam(struct net_device *dev, void __user *useraddr)
2558 {
2559         struct ethtool_fecparam fecparam = { ETHTOOL_GFECPARAM };
2560         int rc;
2561
2562         if (!dev->ethtool_ops->get_fecparam)
2563                 return -EOPNOTSUPP;
2564
2565         rc = dev->ethtool_ops->get_fecparam(dev, &fecparam);
2566         if (rc)
2567                 return rc;
2568
2569         if (copy_to_user(useraddr, &fecparam, sizeof(fecparam)))
2570                 return -EFAULT;
2571         return 0;
2572 }
2573
2574 static int ethtool_set_fecparam(struct net_device *dev, void __user *useraddr)
2575 {
2576         struct ethtool_fecparam fecparam;
2577
2578         if (!dev->ethtool_ops->set_fecparam)
2579                 return -EOPNOTSUPP;
2580
2581         if (copy_from_user(&fecparam, useraddr, sizeof(fecparam)))
2582                 return -EFAULT;
2583
2584         return dev->ethtool_ops->set_fecparam(dev, &fecparam);
2585 }
2586
2587 /* The main entry point in this file.  Called from net/core/dev_ioctl.c */
2588
2589 int dev_ethtool(struct net *net, struct ifreq *ifr)
2590 {
2591         struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
2592         void __user *useraddr = ifr->ifr_data;
2593         u32 ethcmd, sub_cmd;
2594         int rc;
2595         netdev_features_t old_features;
2596
2597         if (!dev || !netif_device_present(dev))
2598                 return -ENODEV;
2599
2600         if (copy_from_user(&ethcmd, useraddr, sizeof(ethcmd)))
2601                 return -EFAULT;
2602
2603         if (ethcmd == ETHTOOL_PERQUEUE) {
2604                 if (copy_from_user(&sub_cmd, useraddr + sizeof(ethcmd), sizeof(sub_cmd)))
2605                         return -EFAULT;
2606         } else {
2607                 sub_cmd = ethcmd;
2608         }
2609         /* Allow some commands to be done by anyone */
2610         switch (sub_cmd) {
2611         case ETHTOOL_GSET:
2612         case ETHTOOL_GDRVINFO:
2613         case ETHTOOL_GMSGLVL:
2614         case ETHTOOL_GLINK:
2615         case ETHTOOL_GCOALESCE:
2616         case ETHTOOL_GRINGPARAM:
2617         case ETHTOOL_GPAUSEPARAM:
2618         case ETHTOOL_GRXCSUM:
2619         case ETHTOOL_GTXCSUM:
2620         case ETHTOOL_GSG:
2621         case ETHTOOL_GSSET_INFO:
2622         case ETHTOOL_GSTRINGS:
2623         case ETHTOOL_GSTATS:
2624         case ETHTOOL_GPHYSTATS:
2625         case ETHTOOL_GTSO:
2626         case ETHTOOL_GPERMADDR:
2627         case ETHTOOL_GGSO:
2628         case ETHTOOL_GGRO:
2629         case ETHTOOL_GFLAGS:
2630         case ETHTOOL_GPFLAGS:
2631         case ETHTOOL_GRXFH:
2632         case ETHTOOL_GRXRINGS:
2633         case ETHTOOL_GRXCLSRLCNT:
2634         case ETHTOOL_GRXCLSRULE:
2635         case ETHTOOL_GRXCLSRLALL:
2636         case ETHTOOL_GRXFHINDIR:
2637         case ETHTOOL_GRSSH:
2638         case ETHTOOL_GFEATURES:
2639         case ETHTOOL_GCHANNELS:
2640         case ETHTOOL_GET_TS_INFO:
2641         case ETHTOOL_GEEE:
2642         case ETHTOOL_GTUNABLE:
2643         case ETHTOOL_PHY_GTUNABLE:
2644         case ETHTOOL_GLINKSETTINGS:
2645         case ETHTOOL_GFECPARAM:
2646                 break;
2647         default:
2648                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2649                         return -EPERM;
2650         }
2651
2652         if (dev->ethtool_ops->begin) {
2653                 rc = dev->ethtool_ops->begin(dev);
2654                 if (rc  < 0)
2655                         return rc;
2656         }
2657         old_features = dev->features;
2658
2659         switch (ethcmd) {
2660         case ETHTOOL_GSET:
2661                 rc = ethtool_get_settings(dev, useraddr);
2662                 break;
2663         case ETHTOOL_SSET:
2664                 rc = ethtool_set_settings(dev, useraddr);
2665                 break;
2666         case ETHTOOL_GDRVINFO:
2667                 rc = ethtool_get_drvinfo(dev, useraddr);
2668                 break;
2669         case ETHTOOL_GREGS:
2670                 rc = ethtool_get_regs(dev, useraddr);
2671                 break;
2672         case ETHTOOL_GWOL:
2673                 rc = ethtool_get_wol(dev, useraddr);
2674                 break;
2675         case ETHTOOL_SWOL:
2676                 rc = ethtool_set_wol(dev, useraddr);
2677                 break;
2678         case ETHTOOL_GMSGLVL:
2679                 rc = ethtool_get_value(dev, useraddr, ethcmd,
2680                                        dev->ethtool_ops->get_msglevel);
2681                 break;
2682         case ETHTOOL_SMSGLVL:
2683                 rc = ethtool_set_value_void(dev, useraddr,
2684                                        dev->ethtool_ops->set_msglevel);
2685                 break;
2686         case ETHTOOL_GEEE:
2687                 rc = ethtool_get_eee(dev, useraddr);
2688                 break;
2689         case ETHTOOL_SEEE:
2690                 rc = ethtool_set_eee(dev, useraddr);
2691                 break;
2692         case ETHTOOL_NWAY_RST:
2693                 rc = ethtool_nway_reset(dev);
2694                 break;
2695         case ETHTOOL_GLINK:
2696                 rc = ethtool_get_link(dev, useraddr);
2697                 break;
2698         case ETHTOOL_GEEPROM:
2699                 rc = ethtool_get_eeprom(dev, useraddr);
2700                 break;
2701         case ETHTOOL_SEEPROM:
2702                 rc = ethtool_set_eeprom(dev, useraddr);
2703                 break;
2704         case ETHTOOL_GCOALESCE:
2705                 rc = ethtool_get_coalesce(dev, useraddr);
2706                 break;
2707         case ETHTOOL_SCOALESCE:
2708                 rc = ethtool_set_coalesce(dev, useraddr);
2709                 break;
2710         case ETHTOOL_GRINGPARAM:
2711                 rc = ethtool_get_ringparam(dev, useraddr);
2712                 break;
2713         case ETHTOOL_SRINGPARAM:
2714                 rc = ethtool_set_ringparam(dev, useraddr);
2715                 break;
2716         case ETHTOOL_GPAUSEPARAM:
2717                 rc = ethtool_get_pauseparam(dev, useraddr);
2718                 break;
2719         case ETHTOOL_SPAUSEPARAM:
2720                 rc = ethtool_set_pauseparam(dev, useraddr);
2721                 break;
2722         case ETHTOOL_TEST:
2723                 rc = ethtool_self_test(dev, useraddr);
2724                 break;
2725         case ETHTOOL_GSTRINGS:
2726                 rc = ethtool_get_strings(dev, useraddr);
2727                 break;
2728         case ETHTOOL_PHYS_ID:
2729                 rc = ethtool_phys_id(dev, useraddr);
2730                 break;
2731         case ETHTOOL_GSTATS:
2732                 rc = ethtool_get_stats(dev, useraddr);
2733                 break;
2734         case ETHTOOL_GPERMADDR:
2735                 rc = ethtool_get_perm_addr(dev, useraddr);
2736                 break;
2737         case ETHTOOL_GFLAGS:
2738                 rc = ethtool_get_value(dev, useraddr, ethcmd,
2739                                         __ethtool_get_flags);
2740                 break;
2741         case ETHTOOL_SFLAGS:
2742                 rc = ethtool_set_value(dev, useraddr, __ethtool_set_flags);
2743                 break;
2744         case ETHTOOL_GPFLAGS:
2745                 rc = ethtool_get_value(dev, useraddr, ethcmd,
2746                                        dev->ethtool_ops->get_priv_flags);
2747                 break;
2748         case ETHTOOL_SPFLAGS:
2749                 rc = ethtool_set_value(dev, useraddr,
2750                                        dev->ethtool_ops->set_priv_flags);
2751                 break;
2752         case ETHTOOL_GRXFH:
2753         case ETHTOOL_GRXRINGS:
2754         case ETHTOOL_GRXCLSRLCNT:
2755         case ETHTOOL_GRXCLSRULE:
2756         case ETHTOOL_GRXCLSRLALL:
2757                 rc = ethtool_get_rxnfc(dev, ethcmd, useraddr);
2758                 break;
2759         case ETHTOOL_SRXFH:
2760         case ETHTOOL_SRXCLSRLDEL:
2761         case ETHTOOL_SRXCLSRLINS:
2762                 rc = ethtool_set_rxnfc(dev, ethcmd, useraddr);
2763                 break;
2764         case ETHTOOL_FLASHDEV:
2765                 rc = ethtool_flash_device(dev, useraddr);
2766                 break;
2767         case ETHTOOL_RESET:
2768                 rc = ethtool_reset(dev, useraddr);
2769                 break;
2770         case ETHTOOL_GSSET_INFO:
2771                 rc = ethtool_get_sset_info(dev, useraddr);
2772                 break;
2773         case ETHTOOL_GRXFHINDIR:
2774                 rc = ethtool_get_rxfh_indir(dev, useraddr);
2775                 break;
2776         case ETHTOOL_SRXFHINDIR:
2777                 rc = ethtool_set_rxfh_indir(dev, useraddr);
2778                 break;
2779         case ETHTOOL_GRSSH:
2780                 rc = ethtool_get_rxfh(dev, useraddr);
2781                 break;
2782         case ETHTOOL_SRSSH:
2783                 rc = ethtool_set_rxfh(dev, useraddr);
2784                 break;
2785         case ETHTOOL_GFEATURES:
2786                 rc = ethtool_get_features(dev, useraddr);
2787                 break;
2788         case ETHTOOL_SFEATURES:
2789                 rc = ethtool_set_features(dev, useraddr);
2790                 break;
2791         case ETHTOOL_GTXCSUM:
2792         case ETHTOOL_GRXCSUM:
2793         case ETHTOOL_GSG:
2794         case ETHTOOL_GTSO:
2795         case ETHTOOL_GGSO:
2796         case ETHTOOL_GGRO:
2797                 rc = ethtool_get_one_feature(dev, useraddr, ethcmd);
2798                 break;
2799         case ETHTOOL_STXCSUM:
2800         case ETHTOOL_SRXCSUM:
2801         case ETHTOOL_SSG:
2802         case ETHTOOL_STSO:
2803         case ETHTOOL_SGSO:
2804         case ETHTOOL_SGRO:
2805                 rc = ethtool_set_one_feature(dev, useraddr, ethcmd);
2806                 break;
2807         case ETHTOOL_GCHANNELS:
2808                 rc = ethtool_get_channels(dev, useraddr);
2809                 break;
2810         case ETHTOOL_SCHANNELS:
2811                 rc = ethtool_set_channels(dev, useraddr);
2812                 break;
2813         case ETHTOOL_SET_DUMP:
2814                 rc = ethtool_set_dump(dev, useraddr);
2815                 break;
2816         case ETHTOOL_GET_DUMP_FLAG:
2817                 rc = ethtool_get_dump_flag(dev, useraddr);
2818                 break;
2819         case ETHTOOL_GET_DUMP_DATA:
2820                 rc = ethtool_get_dump_data(dev, useraddr);
2821                 break;
2822         case ETHTOOL_GET_TS_INFO:
2823                 rc = ethtool_get_ts_info(dev, useraddr);
2824                 break;
2825         case ETHTOOL_GMODULEINFO:
2826                 rc = ethtool_get_module_info(dev, useraddr);
2827                 break;
2828         case ETHTOOL_GMODULEEEPROM:
2829                 rc = ethtool_get_module_eeprom(dev, useraddr);
2830                 break;
2831         case ETHTOOL_GTUNABLE:
2832                 rc = ethtool_get_tunable(dev, useraddr);
2833                 break;
2834         case ETHTOOL_STUNABLE:
2835                 rc = ethtool_set_tunable(dev, useraddr);
2836                 break;
2837         case ETHTOOL_GPHYSTATS:
2838                 rc = ethtool_get_phy_stats(dev, useraddr);
2839                 break;
2840         case ETHTOOL_PERQUEUE:
2841                 rc = ethtool_set_per_queue(dev, useraddr);
2842                 break;
2843         case ETHTOOL_GLINKSETTINGS:
2844                 rc = ethtool_get_link_ksettings(dev, useraddr);
2845                 break;
2846         case ETHTOOL_SLINKSETTINGS:
2847                 rc = ethtool_set_link_ksettings(dev, useraddr);
2848                 break;
2849         case ETHTOOL_PHY_GTUNABLE:
2850                 rc = get_phy_tunable(dev, useraddr);
2851                 break;
2852         case ETHTOOL_PHY_STUNABLE:
2853                 rc = set_phy_tunable(dev, useraddr);
2854                 break;
2855         case ETHTOOL_GFECPARAM:
2856                 rc = ethtool_get_fecparam(dev, useraddr);
2857                 break;
2858         case ETHTOOL_SFECPARAM:
2859                 rc = ethtool_set_fecparam(dev, useraddr);
2860                 break;
2861         default:
2862                 rc = -EOPNOTSUPP;
2863         }
2864
2865         if (dev->ethtool_ops->complete)
2866                 dev->ethtool_ops->complete(dev);
2867
2868         if (old_features != dev->features)
2869                 netdev_features_change(dev);
2870
2871         return rc;
2872 }