net/ethtool/netlink.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include <net/sock.h>
   4 #include <linux/ethtool_netlink.h>
   5 #include "netlink.h"
   6
   7 static struct genl_family ethtool_genl_family;
   8
   9 static bool ethnl_ok __read_mostly;
  10 static u32 ethnl_bcast_seq;
  11
  12 #define ETHTOOL_FLAGS_BASIC (ETHTOOL_FLAG_COMPACT_BITSETS |     \
  13                              ETHTOOL_FLAG_OMIT_REPLY)
  14 #define ETHTOOL_FLAGS_STATS (ETHTOOL_FLAGS_BASIC | ETHTOOL_FLAG_STATS)
  15
  16 const struct nla_policy ethnl_header_policy[] = {
  17         [ETHTOOL_A_HEADER_DEV_INDEX]    = { .type = NLA_U32 },
  18         [ETHTOOL_A_HEADER_DEV_NAME]     = { .type = NLA_NUL_STRING,
  19                                             .len = ALTIFNAMSIZ - 1 },
  20         [ETHTOOL_A_HEADER_FLAGS]        = NLA_POLICY_MASK(NLA_U32,
  21                                                           ETHTOOL_FLAGS_BASIC),
  22 };
  23
  24 const struct nla_policy ethnl_header_policy_stats[] = {
  25         [ETHTOOL_A_HEADER_DEV_INDEX]    = { .type = NLA_U32 },
  26         [ETHTOOL_A_HEADER_DEV_NAME]     = { .type = NLA_NUL_STRING,
  27                                             .len = ALTIFNAMSIZ - 1 },
  28         [ETHTOOL_A_HEADER_FLAGS]        = NLA_POLICY_MASK(NLA_U32,
  29                                                           ETHTOOL_FLAGS_STATS),
  30 };
  31
  32 /**
  33  * ethnl_parse_header_dev_get() - parse request header
  34  * @req_info:    structure to put results into
  35  * @header:      nest attribute with request header
  36  * @net:         request netns
  37  * @extack:      netlink extack for error reporting
  38  * @require_dev: fail if no device identified in header
  39  *
  40  * Parse request header in nested attribute @nest and puts results into
  41  * the structure pointed to by @req_info. Extack from @info is used for error
  42  * reporting. If req_info->dev is not null on return, reference to it has
  43  * been taken. If error is returned, *req_info is null initialized and no
  44  * reference is held.
  45  *
  46  * Return: 0 on success or negative error code
  47  */
  48 int ethnl_parse_header_dev_get(struct ethnl_req_info *req_info,
  49                                const struct nlattr *header, struct net *net,
  50                                struct netlink_ext_ack *extack, bool require_dev)
  51 {
  52         struct nlattr *tb[ARRAY_SIZE(ethnl_header_policy)];
  53         const struct nlattr *devname_attr;
  54         struct net_device *dev = NULL;
  55         u32 flags = 0;
  56         int ret;
  57
  58         if (!header) {
  59                 NL_SET_ERR_MSG(extack, "request header missing");
  60                 return -EINVAL;
  61         }
  62         /* No validation here, command policy should have a nested policy set
  63          * for the header, therefore validation should have already been done.
  64          */
  65         ret = nla_parse_nested(tb, ARRAY_SIZE(ethnl_header_policy) - 1, header,
  66                                NULL, extack);
  67         if (ret < 0)
  68                 return ret;
  69         if (tb[ETHTOOL_A_HEADER_FLAGS])
  70                 flags = nla_get_u32(tb[ETHTOOL_A_HEADER_FLAGS]);
  71
  72         devname_attr = tb[ETHTOOL_A_HEADER_DEV_NAME];
  73         if (tb[ETHTOOL_A_HEADER_DEV_INDEX]) {
  74                 u32 ifindex = nla_get_u32(tb[ETHTOOL_A_HEADER_DEV_INDEX]);
  75
  76                 dev = dev_get_by_index(net, ifindex);
  77                 if (!dev) {
  78                         NL_SET_ERR_MSG_ATTR(extack,
  79                                             tb[ETHTOOL_A_HEADER_DEV_INDEX],
  80                                             "no device matches ifindex");
  81                         return -ENODEV;
  82                 }
  83                 /* if both ifindex and ifname are passed, they must match */
  84                 if (devname_attr &&
  85                     strncmp(dev->name, nla_data(devname_attr), IFNAMSIZ)) {
  86                         dev_put(dev);
  87                         NL_SET_ERR_MSG_ATTR(extack, header,
  88                                             "ifindex and name do not match");
  89                         return -ENODEV;
  90                 }
  91         } else if (devname_attr) {
  92                 dev = dev_get_by_name(net, nla_data(devname_attr));
  93                 if (!dev) {
  94                         NL_SET_ERR_MSG_ATTR(extack, devname_attr,
  95                                             "no device matches name");
  96                         return -ENODEV;
  97                 }
  98         } else if (require_dev) {
  99                 NL_SET_ERR_MSG_ATTR(extack, header,
 100                                     "neither ifindex nor name specified");
 101                 return -EINVAL;
 102         }
 103
 104         if (dev && !netif_device_present(dev)) {
 105                 dev_put(dev);
 106                 NL_SET_ERR_MSG(extack, "device not present");
 107                 return -ENODEV;
 108         }
 109
 110         req_info->dev = dev;
 111         req_info->flags = flags;
 112         return 0;
 113 }
 114
 115 /**
 116  * ethnl_fill_reply_header() - Put common header into a reply message
 117  * @skb:      skb with the message
 118  * @dev:      network device to describe in header
 119  * @attrtype: attribute type to use for the nest
 120  *
 121  * Create a nested attribute with attributes describing given network device.
 122  *
 123  * Return: 0 on success, error value (-EMSGSIZE only) on error
 124  */
 125 int ethnl_fill_reply_header(struct sk_buff *skb, struct net_device *dev,
 126                             u16 attrtype)
 127 {
 128         struct nlattr *nest;
 129
 130         if (!dev)
 131                 return 0;
 132         nest = nla_nest_start(skb, attrtype);
 133         if (!nest)
 134                 return -EMSGSIZE;
 135
 136         if (nla_put_u32(skb, ETHTOOL_A_HEADER_DEV_INDEX, (u32)dev->ifindex) ||
 137             nla_put_string(skb, ETHTOOL_A_HEADER_DEV_NAME, dev->name))
 138                 goto nla_put_failure;
 139         /* If more attributes are put into reply header, ethnl_header_size()
 140          * must be updated to account for them.
 141          */
 142
 143         nla_nest_end(skb, nest);
 144         return 0;
 145
 146 nla_put_failure:
 147         nla_nest_cancel(skb, nest);
 148         return -EMSGSIZE;
 149 }
 150
 151 /**
 152  * ethnl_reply_init() - Create skb for a reply and fill device identification
 153  * @payload:      payload length (without netlink and genetlink header)
 154  * @dev:          device the reply is about (may be null)
 155  * @cmd:          ETHTOOL_MSG_* message type for reply
 156  * @hdr_attrtype: attribute type for common header
 157  * @info:         genetlink info of the received packet we respond to
 158  * @ehdrp:        place to store payload pointer returned by genlmsg_new()
 159  *
 160  * Return: pointer to allocated skb on success, NULL on error
 161  */
 162 struct sk_buff *ethnl_reply_init(size_t payload, struct net_device *dev, u8 cmd,
 163                                  u16 hdr_attrtype, struct genl_info *info,
 164                                  void **ehdrp)
 165 {
 166         struct sk_buff *skb;
 167
 168         skb = genlmsg_new(payload, GFP_KERNEL);
 169         if (!skb)
 170                 goto err;
 171         *ehdrp = genlmsg_put_reply(skb, info, &ethtool_genl_family, 0, cmd);
 172         if (!*ehdrp)
 173                 goto err_free;
 174
 175         if (dev) {
 176                 int ret;
 177
 178                 ret = ethnl_fill_reply_header(skb, dev, hdr_attrtype);
 179                 if (ret < 0)
 180                         goto err_free;
 181         }
 182         return skb;
 183
 184 err_free:
 185         nlmsg_free(skb);
 186 err:
 187         if (info)
 188                 GENL_SET_ERR_MSG(info, "failed to setup reply message");
 189         return NULL;
 190 }
 191
 192 void *ethnl_dump_put(struct sk_buff *skb, struct netlink_callback *cb, u8 cmd)
 193 {
 194         return genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 195                            &ethtool_genl_family, 0, cmd);
 196 }
 197
 198 void *ethnl_bcastmsg_put(struct sk_buff *skb, u8 cmd)
 199 {
 200         return genlmsg_put(skb, 0, ++ethnl_bcast_seq, &ethtool_genl_family, 0,
 201                            cmd);
 202 }
 203
 204 int ethnl_multicast(struct sk_buff *skb, struct net_device *dev)
 205 {
 206         return genlmsg_multicast_netns(&ethtool_genl_family, dev_net(dev), skb,
 207                                        0, ETHNL_MCGRP_MONITOR, GFP_KERNEL);
 208 }
 209
 210 /* GET request helpers */
 211
 212 /**
 213  * struct ethnl_dump_ctx - context structure for generic dumpit() callback
 214  * @ops:        request ops of currently processed message type
 215  * @req_info:   parsed request header of processed request
 216  * @reply_data: data needed to compose the reply
 217  * @pos_hash:   saved iteration position - hashbucket
 218  * @pos_idx:    saved iteration position - index
 219  *
 220  * These parameters are kept in struct netlink_callback as context preserved
 221  * between iterations. They are initialized by ethnl_default_start() and used
 222  * in ethnl_default_dumpit() and ethnl_default_done().
 223  */
 224 struct ethnl_dump_ctx {
 225         const struct ethnl_request_ops  *ops;
 226         struct ethnl_req_info           *req_info;
 227         struct ethnl_reply_data         *reply_data;
 228         int                             pos_hash;
 229         int                             pos_idx;
 230 };
 231
 232 static const struct ethnl_request_ops *
 233 ethnl_default_requests[__ETHTOOL_MSG_USER_CNT] = {
 234         [ETHTOOL_MSG_STRSET_GET]        = &ethnl_strset_request_ops,
 235         [ETHTOOL_MSG_LINKINFO_GET]      = &ethnl_linkinfo_request_ops,
 236         [ETHTOOL_MSG_LINKMODES_GET]     = &ethnl_linkmodes_request_ops,
 237         [ETHTOOL_MSG_LINKSTATE_GET]     = &ethnl_linkstate_request_ops,
 238         [ETHTOOL_MSG_DEBUG_GET]         = &ethnl_debug_request_ops,
 239         [ETHTOOL_MSG_WOL_GET]           = &ethnl_wol_request_ops,
 240         [ETHTOOL_MSG_FEATURES_GET]      = &ethnl_features_request_ops,
 241         [ETHTOOL_MSG_PRIVFLAGS_GET]     = &ethnl_privflags_request_ops,
 242         [ETHTOOL_MSG_RINGS_GET]         = &ethnl_rings_request_ops,
 243         [ETHTOOL_MSG_CHANNELS_GET]      = &ethnl_channels_request_ops,
 244         [ETHTOOL_MSG_COALESCE_GET]      = &ethnl_coalesce_request_ops,
 245         [ETHTOOL_MSG_PAUSE_GET]         = &ethnl_pause_request_ops,
 246         [ETHTOOL_MSG_EEE_GET]           = &ethnl_eee_request_ops,
 247         [ETHTOOL_MSG_FEC_GET]           = &ethnl_fec_request_ops,
 248         [ETHTOOL_MSG_TSINFO_GET]        = &ethnl_tsinfo_request_ops,
 249         [ETHTOOL_MSG_MODULE_EEPROM_GET] = &ethnl_module_eeprom_request_ops,
 250         [ETHTOOL_MSG_STATS_GET]         = &ethnl_stats_request_ops,
 251 };
 252
 253 static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
 254 {
 255         return (struct ethnl_dump_ctx *)cb->ctx;
 256 }
 257
 258 /**
 259  * ethnl_default_parse() - Parse request message
 260  * @req_info:    pointer to structure to put data into
 261  * @tb:          parsed attributes
 262  * @net:         request netns
 263  * @request_ops: struct request_ops for request type
 264  * @extack:      netlink extack for error reporting
 265  * @require_dev: fail if no device identified in header
 266  *
 267  * Parse universal request header and call request specific ->parse_request()
 268  * callback (if defined) to parse the rest of the message.
 269  *
 270  * Return: 0 on success or negative error code
 271  */
 272 static int ethnl_default_parse(struct ethnl_req_info *req_info,
 273                                struct nlattr **tb, struct net *net,
 274                                const struct ethnl_request_ops *request_ops,
 275                                struct netlink_ext_ack *extack, bool require_dev)
 276 {
 277         int ret;
 278
 279         ret = ethnl_parse_header_dev_get(req_info, tb[request_ops->hdr_attr],
 280                                          net, extack, require_dev);
 281         if (ret < 0)
 282                 return ret;
 283
 284         if (request_ops->parse_request) {
 285                 ret = request_ops->parse_request(req_info, tb, extack);
 286                 if (ret < 0)
 287                         return ret;
 288         }
 289
 290         return 0;
 291 }
 292
 293 /**
 294  * ethnl_init_reply_data() - Initialize reply data for GET request
 295  * @reply_data: pointer to embedded struct ethnl_reply_data
 296  * @ops:        instance of struct ethnl_request_ops describing the layout
 297  * @dev:        network device to initialize the reply for
 298  *
 299  * Fills the reply data part with zeros and sets the dev member. Must be called
 300  * before calling the ->fill_reply() callback (for each iteration when handling
 301  * dump requests).
 302  */
 303 static void ethnl_init_reply_data(struct ethnl_reply_data *reply_data,
 304                                   const struct ethnl_request_ops *ops,
 305                                   struct net_device *dev)
 306 {
 307         memset(reply_data, 0, ops->reply_data_size);
 308         reply_data->dev = dev;
 309 }
 310
 311 /* default ->doit() handler for GET type requests */
 312 static int ethnl_default_doit(struct sk_buff *skb, struct genl_info *info)
 313 {
 314         struct ethnl_reply_data *reply_data = NULL;
 315         struct ethnl_req_info *req_info = NULL;
 316         const u8 cmd = info->genlhdr->cmd;
 317         const struct ethnl_request_ops *ops;
 318         struct sk_buff *rskb;
 319         void *reply_payload;
 320         int reply_len;
 321         int ret;
 322
 323         ops = ethnl_default_requests[cmd];
 324         if (WARN_ONCE(!ops, "cmd %u has no ethnl_request_ops\n", cmd))
 325                 return -EOPNOTSUPP;
 326         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 327         if (!req_info)
 328                 return -ENOMEM;
 329         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 330         if (!reply_data) {
 331                 kfree(req_info);
 332                 return -ENOMEM;
 333         }
 334
 335         ret = ethnl_default_parse(req_info, info->attrs, genl_info_net(info),
 336                                   ops, info->extack, !ops->allow_nodev_do);
 337         if (ret < 0)
 338                 goto err_dev;
 339         ethnl_init_reply_data(reply_data, ops, req_info->dev);
 340
 341         rtnl_lock();
 342         ret = ops->prepare_data(req_info, reply_data, info);
 343         rtnl_unlock();
 344         if (ret < 0)
 345                 goto err_cleanup;
 346         ret = ops->reply_size(req_info, reply_data);
 347         if (ret < 0)
 348                 goto err_cleanup;
 349         reply_len = ret + ethnl_reply_header_size();
 350         ret = -ENOMEM;
 351         rskb = ethnl_reply_init(reply_len, req_info->dev, ops->reply_cmd,
 352                                 ops->hdr_attr, info, &reply_payload);
 353         if (!rskb)
 354                 goto err_cleanup;
 355         ret = ops->fill_reply(rskb, req_info, reply_data);
 356         if (ret < 0)
 357                 goto err_msg;
 358         if (ops->cleanup_data)
 359                 ops->cleanup_data(reply_data);
 360
 361         genlmsg_end(rskb, reply_payload);
 362         if (req_info->dev)
 363                 dev_put(req_info->dev);
 364         kfree(reply_data);
 365         kfree(req_info);
 366         return genlmsg_reply(rskb, info);
 367
 368 err_msg:
 369         WARN_ONCE(ret == -EMSGSIZE, "calculated message payload length (%d) not sufficient\n", reply_len);
 370         nlmsg_free(rskb);
 371 err_cleanup:
 372         if (ops->cleanup_data)
 373                 ops->cleanup_data(reply_data);
 374 err_dev:
 375         if (req_info->dev)
 376                 dev_put(req_info->dev);
 377         kfree(reply_data);
 378         kfree(req_info);
 379         return ret;
 380 }
 381
 382 static int ethnl_default_dump_one(struct sk_buff *skb, struct net_device *dev,
 383                                   const struct ethnl_dump_ctx *ctx,
 384                                   struct netlink_callback *cb)
 385 {
 386         void *ehdr;
 387         int ret;
 388
 389         ehdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 390                            &ethtool_genl_family, 0, ctx->ops->reply_cmd);
 391         if (!ehdr)
 392                 return -EMSGSIZE;
 393
 394         ethnl_init_reply_data(ctx->reply_data, ctx->ops, dev);
 395         rtnl_lock();
 396         ret = ctx->ops->prepare_data(ctx->req_info, ctx->reply_data, NULL);
 397         rtnl_unlock();
 398         if (ret < 0)
 399                 goto out;
 400         ret = ethnl_fill_reply_header(skb, dev, ctx->ops->hdr_attr);
 401         if (ret < 0)
 402                 goto out;
 403         ret = ctx->ops->fill_reply(skb, ctx->req_info, ctx->reply_data);
 404
 405 out:
 406         if (ctx->ops->cleanup_data)
 407                 ctx->ops->cleanup_data(ctx->reply_data);
 408         ctx->reply_data->dev = NULL;
 409         if (ret < 0)
 410                 genlmsg_cancel(skb, ehdr);
 411         else
 412                 genlmsg_end(skb, ehdr);
 413         return ret;
 414 }
 415
 416 /* Default ->dumpit() handler for GET requests. Device iteration copied from
 417  * rtnl_dump_ifinfo(); we have to be more careful about device hashtable
 418  * persistence as we cannot guarantee to hold RTNL lock through the whole
 419  * function as rtnetnlink does.
 420  */
 421 static int ethnl_default_dumpit(struct sk_buff *skb,
 422                                 struct netlink_callback *cb)
 423 {
 424         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 425         struct net *net = sock_net(skb->sk);
 426         int s_idx = ctx->pos_idx;
 427         int h, idx = 0;
 428         int ret = 0;
 429
 430         rtnl_lock();
 431         for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 432                 struct hlist_head *head;
 433                 struct net_device *dev;
 434                 unsigned int seq;
 435
 436                 head = &net->dev_index_head[h];
 437
 438 restart_chain:
 439                 seq = net->dev_base_seq;
 440                 cb->seq = seq;
 441                 idx = 0;
 442                 hlist_for_each_entry(dev, head, index_hlist) {
 443                         if (idx < s_idx)
 444                                 goto cont;
 445                         dev_hold(dev);
 446                         rtnl_unlock();
 447
 448                         ret = ethnl_default_dump_one(skb, dev, ctx, cb);
 449                         dev_put(dev);
 450                         if (ret < 0) {
 451                                 if (ret == -EOPNOTSUPP)
 452                                         goto lock_and_cont;
 453                                 if (likely(skb->len))
 454                                         ret = skb->len;
 455                                 goto out;
 456                         }
 457 lock_and_cont:
 458                         rtnl_lock();
 459                         if (net->dev_base_seq != seq) {
 460                                 s_idx = idx + 1;
 461                                 goto restart_chain;
 462                         }
 463 cont:
 464                         idx++;
 465                 }
 466
 467         }
 468         rtnl_unlock();
 469
 470 out:
 471         ctx->pos_hash = h;
 472         ctx->pos_idx = idx;
 473         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 474
 475         return ret;
 476 }
 477
 478 /* generic ->start() handler for GET requests */
 479 static int ethnl_default_start(struct netlink_callback *cb)
 480 {
 481         const struct genl_dumpit_info *info = genl_dumpit_info(cb);
 482         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 483         struct ethnl_reply_data *reply_data;
 484         const struct ethnl_request_ops *ops;
 485         struct ethnl_req_info *req_info;
 486         struct genlmsghdr *ghdr;
 487         int ret;
 488
 489         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
 490
 491         ghdr = nlmsg_data(cb->nlh);
 492         ops = ethnl_default_requests[ghdr->cmd];
 493         if (WARN_ONCE(!ops, "cmd %u has no ethnl_request_ops\n", ghdr->cmd))
 494                 return -EOPNOTSUPP;
 495         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 496         if (!req_info)
 497                 return -ENOMEM;
 498         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 499         if (!reply_data) {
 500                 ret = -ENOMEM;
 501                 goto free_req_info;
 502         }
 503
 504         ret = ethnl_default_parse(req_info, info->attrs, sock_net(cb->skb->sk),
 505                                   ops, cb->extack, false);
 506         if (req_info->dev) {
 507                 /* We ignore device specification in dump requests but as the
 508                  * same parser as for non-dump (doit) requests is used, it
 509                  * would take reference to the device if it finds one
 510                  */
 511                 dev_put(req_info->dev);
 512                 req_info->dev = NULL;
 513         }
 514         if (ret < 0)
 515                 goto free_reply_data;
 516
 517         ctx->ops = ops;
 518         ctx->req_info = req_info;
 519         ctx->reply_data = reply_data;
 520         ctx->pos_hash = 0;
 521         ctx->pos_idx = 0;
 522
 523         return 0;
 524
 525 free_reply_data:
 526         kfree(reply_data);
 527 free_req_info:
 528         kfree(req_info);
 529
 530         return ret;
 531 }
 532
 533 /* default ->done() handler for GET requests */
 534 static int ethnl_default_done(struct netlink_callback *cb)
 535 {
 536         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 537
 538         kfree(ctx->reply_data);
 539         kfree(ctx->req_info);
 540
 541         return 0;
 542 }
 543
 544 static const struct ethnl_request_ops *
 545 ethnl_default_notify_ops[ETHTOOL_MSG_KERNEL_MAX + 1] = {
 546         [ETHTOOL_MSG_LINKINFO_NTF]      = &ethnl_linkinfo_request_ops,
 547         [ETHTOOL_MSG_LINKMODES_NTF]     = &ethnl_linkmodes_request_ops,
 548         [ETHTOOL_MSG_DEBUG_NTF]         = &ethnl_debug_request_ops,
 549         [ETHTOOL_MSG_WOL_NTF]           = &ethnl_wol_request_ops,
 550         [ETHTOOL_MSG_FEATURES_NTF]      = &ethnl_features_request_ops,
 551         [ETHTOOL_MSG_PRIVFLAGS_NTF]     = &ethnl_privflags_request_ops,
 552         [ETHTOOL_MSG_RINGS_NTF]         = &ethnl_rings_request_ops,
 553         [ETHTOOL_MSG_CHANNELS_NTF]      = &ethnl_channels_request_ops,
 554         [ETHTOOL_MSG_COALESCE_NTF]      = &ethnl_coalesce_request_ops,
 555         [ETHTOOL_MSG_PAUSE_NTF]         = &ethnl_pause_request_ops,
 556         [ETHTOOL_MSG_EEE_NTF]           = &ethnl_eee_request_ops,
 557         [ETHTOOL_MSG_FEC_NTF]           = &ethnl_fec_request_ops,
 558 };
 559
 560 /* default notification handler */
 561 static void ethnl_default_notify(struct net_device *dev, unsigned int cmd,
 562                                  const void *data)
 563 {
 564         struct ethnl_reply_data *reply_data;
 565         const struct ethnl_request_ops *ops;
 566         struct ethnl_req_info *req_info;
 567         struct sk_buff *skb;
 568         void *reply_payload;
 569         int reply_len;
 570         int ret;
 571
 572         if (WARN_ONCE(cmd > ETHTOOL_MSG_KERNEL_MAX ||
 573                       !ethnl_default_notify_ops[cmd],
 574                       "unexpected notification type %u\n", cmd))
 575                 return;
 576         ops = ethnl_default_notify_ops[cmd];
 577         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 578         if (!req_info)
 579                 return;
 580         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 581         if (!reply_data) {
 582                 kfree(req_info);
 583                 return;
 584         }
 585
 586         req_info->dev = dev;
 587         req_info->flags |= ETHTOOL_FLAG_COMPACT_BITSETS;
 588
 589         ethnl_init_reply_data(reply_data, ops, dev);
 590         ret = ops->prepare_data(req_info, reply_data, NULL);
 591         if (ret < 0)
 592                 goto err_cleanup;
 593         ret = ops->reply_size(req_info, reply_data);
 594         if (ret < 0)
 595                 goto err_cleanup;
 596         reply_len = ret + ethnl_reply_header_size();
 597         ret = -ENOMEM;
 598         skb = genlmsg_new(reply_len, GFP_KERNEL);
 599         if (!skb)
 600                 goto err_cleanup;
 601         reply_payload = ethnl_bcastmsg_put(skb, cmd);
 602         if (!reply_payload)
 603                 goto err_skb;
 604         ret = ethnl_fill_reply_header(skb, dev, ops->hdr_attr);
 605         if (ret < 0)
 606                 goto err_msg;
 607         ret = ops->fill_reply(skb, req_info, reply_data);
 608         if (ret < 0)
 609                 goto err_msg;
 610         if (ops->cleanup_data)
 611                 ops->cleanup_data(reply_data);
 612
 613         genlmsg_end(skb, reply_payload);
 614         kfree(reply_data);
 615         kfree(req_info);
 616         ethnl_multicast(skb, dev);
 617         return;
 618
 619 err_msg:
 620         WARN_ONCE(ret == -EMSGSIZE,
 621                   "calculated message payload length (%d) not sufficient\n",
 622                   reply_len);
 623 err_skb:
 624         nlmsg_free(skb);
 625 err_cleanup:
 626         if (ops->cleanup_data)
 627                 ops->cleanup_data(reply_data);
 628         kfree(reply_data);
 629         kfree(req_info);
 630         return;
 631 }
 632
 633 /* notifications */
 634
 635 typedef void (*ethnl_notify_handler_t)(struct net_device *dev, unsigned int cmd,
 636                                        const void *data);
 637
 638 static const ethnl_notify_handler_t ethnl_notify_handlers[] = {
 639         [ETHTOOL_MSG_LINKINFO_NTF]      = ethnl_default_notify,
 640         [ETHTOOL_MSG_LINKMODES_NTF]     = ethnl_default_notify,
 641         [ETHTOOL_MSG_DEBUG_NTF]         = ethnl_default_notify,
 642         [ETHTOOL_MSG_WOL_NTF]           = ethnl_default_notify,
 643         [ETHTOOL_MSG_FEATURES_NTF]      = ethnl_default_notify,
 644         [ETHTOOL_MSG_PRIVFLAGS_NTF]     = ethnl_default_notify,
 645         [ETHTOOL_MSG_RINGS_NTF]         = ethnl_default_notify,
 646         [ETHTOOL_MSG_CHANNELS_NTF]      = ethnl_default_notify,
 647         [ETHTOOL_MSG_COALESCE_NTF]      = ethnl_default_notify,
 648         [ETHTOOL_MSG_PAUSE_NTF]         = ethnl_default_notify,
 649         [ETHTOOL_MSG_EEE_NTF]           = ethnl_default_notify,
 650         [ETHTOOL_MSG_FEC_NTF]           = ethnl_default_notify,
 651 };
 652
 653 void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data)
 654 {
 655         if (unlikely(!ethnl_ok))
 656                 return;
 657         ASSERT_RTNL();
 658
 659         if (likely(cmd < ARRAY_SIZE(ethnl_notify_handlers) &&
 660                    ethnl_notify_handlers[cmd]))
 661                 ethnl_notify_handlers[cmd](dev, cmd, data);
 662         else
 663                 WARN_ONCE(1, "notification %u not implemented (dev=%s)\n",
 664                           cmd, netdev_name(dev));
 665 }
 666 EXPORT_SYMBOL(ethtool_notify);
 667
 668 static void ethnl_notify_features(struct netdev_notifier_info *info)
 669 {
 670         struct net_device *dev = netdev_notifier_info_to_dev(info);
 671
 672         ethtool_notify(dev, ETHTOOL_MSG_FEATURES_NTF, NULL);
 673 }
 674
 675 static int ethnl_netdev_event(struct notifier_block *this, unsigned long event,
 676                               void *ptr)
 677 {
 678         switch (event) {
 679         case NETDEV_FEAT_CHANGE:
 680                 ethnl_notify_features(ptr);
 681                 break;
 682         }
 683
 684         return NOTIFY_DONE;
 685 }
 686
 687 static struct notifier_block ethnl_netdev_notifier = {
 688         .notifier_call = ethnl_netdev_event,
 689 };
 690
 691 /* genetlink setup */
 692
 693 static const struct genl_ops ethtool_genl_ops[] = {
 694         {
 695                 .cmd    = ETHTOOL_MSG_STRSET_GET,
 696                 .doit   = ethnl_default_doit,
 697                 .start  = ethnl_default_start,
 698                 .dumpit = ethnl_default_dumpit,
 699                 .done   = ethnl_default_done,
 700                 .policy = ethnl_strset_get_policy,
 701                 .maxattr = ARRAY_SIZE(ethnl_strset_get_policy) - 1,
 702         },
 703         {
 704                 .cmd    = ETHTOOL_MSG_LINKINFO_GET,
 705                 .doit   = ethnl_default_doit,
 706                 .start  = ethnl_default_start,
 707                 .dumpit = ethnl_default_dumpit,
 708                 .done   = ethnl_default_done,
 709                 .policy = ethnl_linkinfo_get_policy,
 710                 .maxattr = ARRAY_SIZE(ethnl_linkinfo_get_policy) - 1,
 711         },
 712         {
 713                 .cmd    = ETHTOOL_MSG_LINKINFO_SET,
 714                 .flags  = GENL_UNS_ADMIN_PERM,
 715                 .doit   = ethnl_set_linkinfo,
 716                 .policy = ethnl_linkinfo_set_policy,
 717                 .maxattr = ARRAY_SIZE(ethnl_linkinfo_set_policy) - 1,
 718         },
 719         {
 720                 .cmd    = ETHTOOL_MSG_LINKMODES_GET,
 721                 .doit   = ethnl_default_doit,
 722                 .start  = ethnl_default_start,
 723                 .dumpit = ethnl_default_dumpit,
 724                 .done   = ethnl_default_done,
 725                 .policy = ethnl_linkmodes_get_policy,
 726                 .maxattr = ARRAY_SIZE(ethnl_linkmodes_get_policy) - 1,
 727         },
 728         {
 729                 .cmd    = ETHTOOL_MSG_LINKMODES_SET,
 730                 .flags  = GENL_UNS_ADMIN_PERM,
 731                 .doit   = ethnl_set_linkmodes,
 732                 .policy = ethnl_linkmodes_set_policy,
 733                 .maxattr = ARRAY_SIZE(ethnl_linkmodes_set_policy) - 1,
 734         },
 735         {
 736                 .cmd    = ETHTOOL_MSG_LINKSTATE_GET,
 737                 .doit   = ethnl_default_doit,
 738                 .start  = ethnl_default_start,
 739                 .dumpit = ethnl_default_dumpit,
 740                 .done   = ethnl_default_done,
 741                 .policy = ethnl_linkstate_get_policy,
 742                 .maxattr = ARRAY_SIZE(ethnl_linkstate_get_policy) - 1,
 743         },
 744         {
 745                 .cmd    = ETHTOOL_MSG_DEBUG_GET,
 746                 .doit   = ethnl_default_doit,
 747                 .start  = ethnl_default_start,
 748                 .dumpit = ethnl_default_dumpit,
 749                 .done   = ethnl_default_done,
 750                 .policy = ethnl_debug_get_policy,
 751                 .maxattr = ARRAY_SIZE(ethnl_debug_get_policy) - 1,
 752         },
 753         {
 754                 .cmd    = ETHTOOL_MSG_DEBUG_SET,
 755                 .flags  = GENL_UNS_ADMIN_PERM,
 756                 .doit   = ethnl_set_debug,
 757                 .policy = ethnl_debug_set_policy,
 758                 .maxattr = ARRAY_SIZE(ethnl_debug_set_policy) - 1,
 759         },
 760         {
 761                 .cmd    = ETHTOOL_MSG_WOL_GET,
 762                 .flags  = GENL_UNS_ADMIN_PERM,
 763                 .doit   = ethnl_default_doit,
 764                 .start  = ethnl_default_start,
 765                 .dumpit = ethnl_default_dumpit,
 766                 .done   = ethnl_default_done,
 767                 .policy = ethnl_wol_get_policy,
 768                 .maxattr = ARRAY_SIZE(ethnl_wol_get_policy) - 1,
 769         },
 770         {
 771                 .cmd    = ETHTOOL_MSG_WOL_SET,
 772                 .flags  = GENL_UNS_ADMIN_PERM,
 773                 .doit   = ethnl_set_wol,
 774                 .policy = ethnl_wol_set_policy,
 775                 .maxattr = ARRAY_SIZE(ethnl_wol_set_policy) - 1,
 776         },
 777         {
 778                 .cmd    = ETHTOOL_MSG_FEATURES_GET,
 779                 .doit   = ethnl_default_doit,
 780                 .start  = ethnl_default_start,
 781                 .dumpit = ethnl_default_dumpit,
 782                 .done   = ethnl_default_done,
 783                 .policy = ethnl_features_get_policy,
 784                 .maxattr = ARRAY_SIZE(ethnl_features_get_policy) - 1,
 785         },
 786         {
 787                 .cmd    = ETHTOOL_MSG_FEATURES_SET,
 788                 .flags  = GENL_UNS_ADMIN_PERM,
 789                 .doit   = ethnl_set_features,
 790                 .policy = ethnl_features_set_policy,
 791                 .maxattr = ARRAY_SIZE(ethnl_features_set_policy) - 1,
 792         },
 793         {
 794                 .cmd    = ETHTOOL_MSG_PRIVFLAGS_GET,
 795                 .doit   = ethnl_default_doit,
 796                 .start  = ethnl_default_start,
 797                 .dumpit = ethnl_default_dumpit,
 798                 .done   = ethnl_default_done,
 799                 .policy = ethnl_privflags_get_policy,
 800                 .maxattr = ARRAY_SIZE(ethnl_privflags_get_policy) - 1,
 801         },
 802         {
 803                 .cmd    = ETHTOOL_MSG_PRIVFLAGS_SET,
 804                 .flags  = GENL_UNS_ADMIN_PERM,
 805                 .doit   = ethnl_set_privflags,
 806                 .policy = ethnl_privflags_set_policy,
 807                 .maxattr = ARRAY_SIZE(ethnl_privflags_set_policy) - 1,
 808         },
 809         {
 810                 .cmd    = ETHTOOL_MSG_RINGS_GET,
 811                 .doit   = ethnl_default_doit,
 812                 .start  = ethnl_default_start,
 813                 .dumpit = ethnl_default_dumpit,
 814                 .done   = ethnl_default_done,
 815                 .policy = ethnl_rings_get_policy,
 816                 .maxattr = ARRAY_SIZE(ethnl_rings_get_policy) - 1,
 817         },
 818         {
 819                 .cmd    = ETHTOOL_MSG_RINGS_SET,
 820                 .flags  = GENL_UNS_ADMIN_PERM,
 821                 .doit   = ethnl_set_rings,
 822                 .policy = ethnl_rings_set_policy,
 823                 .maxattr = ARRAY_SIZE(ethnl_rings_set_policy) - 1,
 824         },
 825         {
 826                 .cmd    = ETHTOOL_MSG_CHANNELS_GET,
 827                 .doit   = ethnl_default_doit,
 828                 .start  = ethnl_default_start,
 829                 .dumpit = ethnl_default_dumpit,
 830                 .done   = ethnl_default_done,
 831                 .policy = ethnl_channels_get_policy,
 832                 .maxattr = ARRAY_SIZE(ethnl_channels_get_policy) - 1,
 833         },
 834         {
 835                 .cmd    = ETHTOOL_MSG_CHANNELS_SET,
 836                 .flags  = GENL_UNS_ADMIN_PERM,
 837                 .doit   = ethnl_set_channels,
 838                 .policy = ethnl_channels_set_policy,
 839                 .maxattr = ARRAY_SIZE(ethnl_channels_set_policy) - 1,
 840         },
 841         {
 842                 .cmd    = ETHTOOL_MSG_COALESCE_GET,
 843                 .doit   = ethnl_default_doit,
 844                 .start  = ethnl_default_start,
 845                 .dumpit = ethnl_default_dumpit,
 846                 .done   = ethnl_default_done,
 847                 .policy = ethnl_coalesce_get_policy,
 848                 .maxattr = ARRAY_SIZE(ethnl_coalesce_get_policy) - 1,
 849         },
 850         {
 851                 .cmd    = ETHTOOL_MSG_COALESCE_SET,
 852                 .flags  = GENL_UNS_ADMIN_PERM,
 853                 .doit   = ethnl_set_coalesce,
 854                 .policy = ethnl_coalesce_set_policy,
 855                 .maxattr = ARRAY_SIZE(ethnl_coalesce_set_policy) - 1,
 856         },
 857         {
 858                 .cmd    = ETHTOOL_MSG_PAUSE_GET,
 859                 .doit   = ethnl_default_doit,
 860                 .start  = ethnl_default_start,
 861                 .dumpit = ethnl_default_dumpit,
 862                 .done   = ethnl_default_done,
 863                 .policy = ethnl_pause_get_policy,
 864                 .maxattr = ARRAY_SIZE(ethnl_pause_get_policy) - 1,
 865         },
 866         {
 867                 .cmd    = ETHTOOL_MSG_PAUSE_SET,
 868                 .flags  = GENL_UNS_ADMIN_PERM,
 869                 .doit   = ethnl_set_pause,
 870                 .policy = ethnl_pause_set_policy,
 871                 .maxattr = ARRAY_SIZE(ethnl_pause_set_policy) - 1,
 872         },
 873         {
 874                 .cmd    = ETHTOOL_MSG_EEE_GET,
 875                 .doit   = ethnl_default_doit,
 876                 .start  = ethnl_default_start,
 877                 .dumpit = ethnl_default_dumpit,
 878                 .done   = ethnl_default_done,
 879                 .policy = ethnl_eee_get_policy,
 880                 .maxattr = ARRAY_SIZE(ethnl_eee_get_policy) - 1,
 881         },
 882         {
 883                 .cmd    = ETHTOOL_MSG_EEE_SET,
 884                 .flags  = GENL_UNS_ADMIN_PERM,
 885                 .doit   = ethnl_set_eee,
 886                 .policy = ethnl_eee_set_policy,
 887                 .maxattr = ARRAY_SIZE(ethnl_eee_set_policy) - 1,
 888         },
 889         {
 890                 .cmd    = ETHTOOL_MSG_TSINFO_GET,
 891                 .doit   = ethnl_default_doit,
 892                 .start  = ethnl_default_start,
 893                 .dumpit = ethnl_default_dumpit,
 894                 .done   = ethnl_default_done,
 895                 .policy = ethnl_tsinfo_get_policy,
 896                 .maxattr = ARRAY_SIZE(ethnl_tsinfo_get_policy) - 1,
 897         },
 898         {
 899                 .cmd    = ETHTOOL_MSG_CABLE_TEST_ACT,
 900                 .flags  = GENL_UNS_ADMIN_PERM,
 901                 .doit   = ethnl_act_cable_test,
 902                 .policy = ethnl_cable_test_act_policy,
 903                 .maxattr = ARRAY_SIZE(ethnl_cable_test_act_policy) - 1,
 904         },
 905         {
 906                 .cmd    = ETHTOOL_MSG_CABLE_TEST_TDR_ACT,
 907                 .flags  = GENL_UNS_ADMIN_PERM,
 908                 .doit   = ethnl_act_cable_test_tdr,
 909                 .policy = ethnl_cable_test_tdr_act_policy,
 910                 .maxattr = ARRAY_SIZE(ethnl_cable_test_tdr_act_policy) - 1,
 911         },
 912         {
 913                 .cmd    = ETHTOOL_MSG_TUNNEL_INFO_GET,
 914                 .doit   = ethnl_tunnel_info_doit,
 915                 .start  = ethnl_tunnel_info_start,
 916                 .dumpit = ethnl_tunnel_info_dumpit,
 917                 .policy = ethnl_tunnel_info_get_policy,
 918                 .maxattr = ARRAY_SIZE(ethnl_tunnel_info_get_policy) - 1,
 919         },
 920         {
 921                 .cmd    = ETHTOOL_MSG_FEC_GET,
 922                 .doit   = ethnl_default_doit,
 923                 .start  = ethnl_default_start,
 924                 .dumpit = ethnl_default_dumpit,
 925                 .done   = ethnl_default_done,
 926                 .policy = ethnl_fec_get_policy,
 927                 .maxattr = ARRAY_SIZE(ethnl_fec_get_policy) - 1,
 928         },
 929         {
 930                 .cmd    = ETHTOOL_MSG_FEC_SET,
 931                 .flags  = GENL_UNS_ADMIN_PERM,
 932                 .doit   = ethnl_set_fec,
 933                 .policy = ethnl_fec_set_policy,
 934                 .maxattr = ARRAY_SIZE(ethnl_fec_set_policy) - 1,
 935         },
 936         {
 937                 .cmd    = ETHTOOL_MSG_MODULE_EEPROM_GET,
 938                 .flags  = GENL_UNS_ADMIN_PERM,
 939                 .doit   = ethnl_default_doit,
 940                 .start  = ethnl_default_start,
 941                 .dumpit = ethnl_default_dumpit,
 942                 .done   = ethnl_default_done,
 943                 .policy = ethnl_module_eeprom_get_policy,
 944                 .maxattr = ARRAY_SIZE(ethnl_module_eeprom_get_policy) - 1,
 945         },
 946         {
 947                 .cmd    = ETHTOOL_MSG_STATS_GET,
 948                 .doit   = ethnl_default_doit,
 949                 .start  = ethnl_default_start,
 950                 .dumpit = ethnl_default_dumpit,
 951                 .done   = ethnl_default_done,
 952                 .policy = ethnl_stats_get_policy,
 953                 .maxattr = ARRAY_SIZE(ethnl_stats_get_policy) - 1,
 954         },
 955 };
 956
 957 static const struct genl_multicast_group ethtool_nl_mcgrps[] = {
 958         [ETHNL_MCGRP_MONITOR] = { .name = ETHTOOL_MCGRP_MONITOR_NAME },
 959 };
 960
 961 static struct genl_family ethtool_genl_family __ro_after_init = {
 962         .name           = ETHTOOL_GENL_NAME,
 963         .version        = ETHTOOL_GENL_VERSION,
 964         .netnsok        = true,
 965         .parallel_ops   = true,
 966         .ops            = ethtool_genl_ops,
 967         .n_ops          = ARRAY_SIZE(ethtool_genl_ops),
 968         .mcgrps         = ethtool_nl_mcgrps,
 969         .n_mcgrps       = ARRAY_SIZE(ethtool_nl_mcgrps),
 970 };
 971
 972 /* module setup */
 973
 974 static int __init ethnl_init(void)
 975 {
 976         int ret;
 977
 978         ret = genl_register_family(&ethtool_genl_family);
 979         if (WARN(ret < 0, "ethtool: genetlink family registration failed"))
 980                 return ret;
 981         ethnl_ok = true;
 982
 983         ret = register_netdevice_notifier(&ethnl_netdev_notifier);
 984         WARN(ret < 0, "ethtool: net device notifier registration failed");
 985         return ret;
 986 }
 987
 988 subsys_initcall(ethnl_init);