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 static const struct nla_policy ethnl_header_policy[ETHTOOL_A_HEADER_MAX + 1] = {
  13         [ETHTOOL_A_HEADER_UNSPEC]       = { .type = NLA_REJECT },
  14         [ETHTOOL_A_HEADER_DEV_INDEX]    = { .type = NLA_U32 },
  15         [ETHTOOL_A_HEADER_DEV_NAME]     = { .type = NLA_NUL_STRING,
  16                                             .len = ALTIFNAMSIZ - 1 },
  17         [ETHTOOL_A_HEADER_FLAGS]        = { .type = NLA_U32 },
  18 };
  19
  20 /**
  21  * ethnl_parse_header() - parse request header
  22  * @req_info:    structure to put results into
  23  * @header:      nest attribute with request header
  24  * @net:         request netns
  25  * @extack:      netlink extack for error reporting
  26  * @require_dev: fail if no device identified in header
  27  *
  28  * Parse request header in nested attribute @nest and puts results into
  29  * the structure pointed to by @req_info. Extack from @info is used for error
  30  * reporting. If req_info->dev is not null on return, reference to it has
  31  * been taken. If error is returned, *req_info is null initialized and no
  32  * reference is held.
  33  *
  34  * Return: 0 on success or negative error code
  35  */
  36 int ethnl_parse_header(struct ethnl_req_info *req_info,
  37                        const struct nlattr *header, struct net *net,
  38                        struct netlink_ext_ack *extack, bool require_dev)
  39 {
  40         struct nlattr *tb[ETHTOOL_A_HEADER_MAX + 1];
  41         const struct nlattr *devname_attr;
  42         struct net_device *dev = NULL;
  43         u32 flags = 0;
  44         int ret;
  45
  46         if (!header) {
  47                 NL_SET_ERR_MSG(extack, "request header missing");
  48                 return -EINVAL;
  49         }
  50         ret = nla_parse_nested(tb, ETHTOOL_A_HEADER_MAX, header,
  51                                ethnl_header_policy, extack);
  52         if (ret < 0)
  53                 return ret;
  54         if (tb[ETHTOOL_A_HEADER_FLAGS]) {
  55                 flags = nla_get_u32(tb[ETHTOOL_A_HEADER_FLAGS]);
  56                 if (flags & ~ETHTOOL_FLAG_ALL) {
  57                         NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_HEADER_FLAGS],
  58                                             "unrecognized request flags");
  59                         nl_set_extack_cookie_u32(extack, ETHTOOL_FLAG_ALL);
  60                         return -EOPNOTSUPP;
  61                 }
  62         }
  63
  64         devname_attr = tb[ETHTOOL_A_HEADER_DEV_NAME];
  65         if (tb[ETHTOOL_A_HEADER_DEV_INDEX]) {
  66                 u32 ifindex = nla_get_u32(tb[ETHTOOL_A_HEADER_DEV_INDEX]);
  67
  68                 dev = dev_get_by_index(net, ifindex);
  69                 if (!dev) {
  70                         NL_SET_ERR_MSG_ATTR(extack,
  71                                             tb[ETHTOOL_A_HEADER_DEV_INDEX],
  72                                             "no device matches ifindex");
  73                         return -ENODEV;
  74                 }
  75                 /* if both ifindex and ifname are passed, they must match */
  76                 if (devname_attr &&
  77                     strncmp(dev->name, nla_data(devname_attr), IFNAMSIZ)) {
  78                         dev_put(dev);
  79                         NL_SET_ERR_MSG_ATTR(extack, header,
  80                                             "ifindex and name do not match");
  81                         return -ENODEV;
  82                 }
  83         } else if (devname_attr) {
  84                 dev = dev_get_by_name(net, nla_data(devname_attr));
  85                 if (!dev) {
  86                         NL_SET_ERR_MSG_ATTR(extack, devname_attr,
  87                                             "no device matches name");
  88                         return -ENODEV;
  89                 }
  90         } else if (require_dev) {
  91                 NL_SET_ERR_MSG_ATTR(extack, header,
  92                                     "neither ifindex nor name specified");
  93                 return -EINVAL;
  94         }
  95
  96         if (dev && !netif_device_present(dev)) {
  97                 dev_put(dev);
  98                 NL_SET_ERR_MSG(extack, "device not present");
  99                 return -ENODEV;
 100         }
 101
 102         req_info->dev = dev;
 103         req_info->flags = flags;
 104         return 0;
 105 }
 106
 107 /**
 108  * ethnl_fill_reply_header() - Put common header into a reply message
 109  * @skb:      skb with the message
 110  * @dev:      network device to describe in header
 111  * @attrtype: attribute type to use for the nest
 112  *
 113  * Create a nested attribute with attributes describing given network device.
 114  *
 115  * Return: 0 on success, error value (-EMSGSIZE only) on error
 116  */
 117 int ethnl_fill_reply_header(struct sk_buff *skb, struct net_device *dev,
 118                             u16 attrtype)
 119 {
 120         struct nlattr *nest;
 121
 122         if (!dev)
 123                 return 0;
 124         nest = nla_nest_start(skb, attrtype);
 125         if (!nest)
 126                 return -EMSGSIZE;
 127
 128         if (nla_put_u32(skb, ETHTOOL_A_HEADER_DEV_INDEX, (u32)dev->ifindex) ||
 129             nla_put_string(skb, ETHTOOL_A_HEADER_DEV_NAME, dev->name))
 130                 goto nla_put_failure;
 131         /* If more attributes are put into reply header, ethnl_header_size()
 132          * must be updated to account for them.
 133          */
 134
 135         nla_nest_end(skb, nest);
 136         return 0;
 137
 138 nla_put_failure:
 139         nla_nest_cancel(skb, nest);
 140         return -EMSGSIZE;
 141 }
 142
 143 /**
 144  * ethnl_reply_init() - Create skb for a reply and fill device identification
 145  * @payload:      payload length (without netlink and genetlink header)
 146  * @dev:          device the reply is about (may be null)
 147  * @cmd:          ETHTOOL_MSG_* message type for reply
 148  * @hdr_attrtype: attribute type for common header
 149  * @info:         genetlink info of the received packet we respond to
 150  * @ehdrp:        place to store payload pointer returned by genlmsg_new()
 151  *
 152  * Return: pointer to allocated skb on success, NULL on error
 153  */
 154 struct sk_buff *ethnl_reply_init(size_t payload, struct net_device *dev, u8 cmd,
 155                                  u16 hdr_attrtype, struct genl_info *info,
 156                                  void **ehdrp)
 157 {
 158         struct sk_buff *skb;
 159
 160         skb = genlmsg_new(payload, GFP_KERNEL);
 161         if (!skb)
 162                 goto err;
 163         *ehdrp = genlmsg_put_reply(skb, info, &ethtool_genl_family, 0, cmd);
 164         if (!*ehdrp)
 165                 goto err_free;
 166
 167         if (dev) {
 168                 int ret;
 169
 170                 ret = ethnl_fill_reply_header(skb, dev, hdr_attrtype);
 171                 if (ret < 0)
 172                         goto err_free;
 173         }
 174         return skb;
 175
 176 err_free:
 177         nlmsg_free(skb);
 178 err:
 179         if (info)
 180                 GENL_SET_ERR_MSG(info, "failed to setup reply message");
 181         return NULL;
 182 }
 183
 184 static void *ethnl_bcastmsg_put(struct sk_buff *skb, u8 cmd)
 185 {
 186         return genlmsg_put(skb, 0, ++ethnl_bcast_seq, &ethtool_genl_family, 0,
 187                            cmd);
 188 }
 189
 190 static int ethnl_multicast(struct sk_buff *skb, struct net_device *dev)
 191 {
 192         return genlmsg_multicast_netns(&ethtool_genl_family, dev_net(dev), skb,
 193                                        0, ETHNL_MCGRP_MONITOR, GFP_KERNEL);
 194 }
 195
 196 /* GET request helpers */
 197
 198 /**
 199  * struct ethnl_dump_ctx - context structure for generic dumpit() callback
 200  * @ops:        request ops of currently processed message type
 201  * @req_info:   parsed request header of processed request
 202  * @reply_data: data needed to compose the reply
 203  * @pos_hash:   saved iteration position - hashbucket
 204  * @pos_idx:    saved iteration position - index
 205  *
 206  * These parameters are kept in struct netlink_callback as context preserved
 207  * between iterations. They are initialized by ethnl_default_start() and used
 208  * in ethnl_default_dumpit() and ethnl_default_done().
 209  */
 210 struct ethnl_dump_ctx {
 211         const struct ethnl_request_ops  *ops;
 212         struct ethnl_req_info           *req_info;
 213         struct ethnl_reply_data         *reply_data;
 214         int                             pos_hash;
 215         int                             pos_idx;
 216 };
 217
 218 static const struct ethnl_request_ops *
 219 ethnl_default_requests[__ETHTOOL_MSG_USER_CNT] = {
 220         [ETHTOOL_MSG_STRSET_GET]        = &ethnl_strset_request_ops,
 221         [ETHTOOL_MSG_LINKINFO_GET]      = &ethnl_linkinfo_request_ops,
 222         [ETHTOOL_MSG_LINKMODES_GET]     = &ethnl_linkmodes_request_ops,
 223         [ETHTOOL_MSG_LINKSTATE_GET]     = &ethnl_linkstate_request_ops,
 224         [ETHTOOL_MSG_DEBUG_GET]         = &ethnl_debug_request_ops,
 225         [ETHTOOL_MSG_WOL_GET]           = &ethnl_wol_request_ops,
 226 };
 227
 228 static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
 229 {
 230         return (struct ethnl_dump_ctx *)cb->ctx;
 231 }
 232
 233 /**
 234  * ethnl_default_parse() - Parse request message
 235  * @req_info:    pointer to structure to put data into
 236  * @nlhdr:       pointer to request message header
 237  * @net:         request netns
 238  * @request_ops: struct request_ops for request type
 239  * @extack:      netlink extack for error reporting
 240  * @require_dev: fail if no device identified in header
 241  *
 242  * Parse universal request header and call request specific ->parse_request()
 243  * callback (if defined) to parse the rest of the message.
 244  *
 245  * Return: 0 on success or negative error code
 246  */
 247 static int ethnl_default_parse(struct ethnl_req_info *req_info,
 248                                const struct nlmsghdr *nlhdr, struct net *net,
 249                                const struct ethnl_request_ops *request_ops,
 250                                struct netlink_ext_ack *extack, bool require_dev)
 251 {
 252         struct nlattr **tb;
 253         int ret;
 254
 255         tb = kmalloc_array(request_ops->max_attr + 1, sizeof(tb[0]),
 256                            GFP_KERNEL);
 257         if (!tb)
 258                 return -ENOMEM;
 259
 260         ret = nlmsg_parse(nlhdr, GENL_HDRLEN, tb, request_ops->max_attr,
 261                           request_ops->request_policy, extack);
 262         if (ret < 0)
 263                 goto out;
 264         ret = ethnl_parse_header(req_info, tb[request_ops->hdr_attr], net,
 265                                  extack, require_dev);
 266         if (ret < 0)
 267                 goto out;
 268
 269         if (request_ops->parse_request) {
 270                 ret = request_ops->parse_request(req_info, tb, extack);
 271                 if (ret < 0)
 272                         goto out;
 273         }
 274
 275         ret = 0;
 276 out:
 277         kfree(tb);
 278         return ret;
 279 }
 280
 281 /**
 282  * ethnl_init_reply_data() - Initialize reply data for GET request
 283  * @reply_data: pointer to embedded struct ethnl_reply_data
 284  * @ops:        instance of struct ethnl_request_ops describing the layout
 285  * @dev:        network device to initialize the reply for
 286  *
 287  * Fills the reply data part with zeros and sets the dev member. Must be called
 288  * before calling the ->fill_reply() callback (for each iteration when handling
 289  * dump requests).
 290  */
 291 static void ethnl_init_reply_data(struct ethnl_reply_data *reply_data,
 292                                   const struct ethnl_request_ops *ops,
 293                                   struct net_device *dev)
 294 {
 295         memset(reply_data, 0, ops->reply_data_size);
 296         reply_data->dev = dev;
 297 }
 298
 299 /* default ->doit() handler for GET type requests */
 300 static int ethnl_default_doit(struct sk_buff *skb, struct genl_info *info)
 301 {
 302         struct ethnl_reply_data *reply_data = NULL;
 303         struct ethnl_req_info *req_info = NULL;
 304         const u8 cmd = info->genlhdr->cmd;
 305         const struct ethnl_request_ops *ops;
 306         struct sk_buff *rskb;
 307         void *reply_payload;
 308         int reply_len;
 309         int ret;
 310
 311         ops = ethnl_default_requests[cmd];
 312         if (WARN_ONCE(!ops, "cmd %u has no ethnl_request_ops\n", cmd))
 313                 return -EOPNOTSUPP;
 314         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 315         if (!req_info)
 316                 return -ENOMEM;
 317         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 318         if (!reply_data) {
 319                 kfree(req_info);
 320                 return -ENOMEM;
 321         }
 322
 323         ret = ethnl_default_parse(req_info, info->nlhdr, genl_info_net(info), ops,
 324                                   info->extack, !ops->allow_nodev_do);
 325         if (ret < 0)
 326                 goto err_dev;
 327         ethnl_init_reply_data(reply_data, ops, req_info->dev);
 328
 329         rtnl_lock();
 330         ret = ops->prepare_data(req_info, reply_data, info);
 331         rtnl_unlock();
 332         if (ret < 0)
 333                 goto err_cleanup;
 334         ret = ops->reply_size(req_info, reply_data);
 335         if (ret < 0)
 336                 goto err_cleanup;
 337         reply_len = ret;
 338         ret = -ENOMEM;
 339         rskb = ethnl_reply_init(reply_len, req_info->dev, ops->reply_cmd,
 340                                 ops->hdr_attr, info, &reply_payload);
 341         if (!rskb)
 342                 goto err_cleanup;
 343         ret = ops->fill_reply(rskb, req_info, reply_data);
 344         if (ret < 0)
 345                 goto err_msg;
 346         if (ops->cleanup_data)
 347                 ops->cleanup_data(reply_data);
 348
 349         genlmsg_end(rskb, reply_payload);
 350         if (req_info->dev)
 351                 dev_put(req_info->dev);
 352         kfree(reply_data);
 353         kfree(req_info);
 354         return genlmsg_reply(rskb, info);
 355
 356 err_msg:
 357         WARN_ONCE(ret == -EMSGSIZE, "calculated message payload length (%d) not sufficient\n", reply_len);
 358         nlmsg_free(rskb);
 359 err_cleanup:
 360         if (ops->cleanup_data)
 361                 ops->cleanup_data(reply_data);
 362 err_dev:
 363         if (req_info->dev)
 364                 dev_put(req_info->dev);
 365         kfree(reply_data);
 366         kfree(req_info);
 367         return ret;
 368 }
 369
 370 static int ethnl_default_dump_one(struct sk_buff *skb, struct net_device *dev,
 371                                   const struct ethnl_dump_ctx *ctx)
 372 {
 373         int ret;
 374
 375         ethnl_init_reply_data(ctx->reply_data, ctx->ops, dev);
 376         rtnl_lock();
 377         ret = ctx->ops->prepare_data(ctx->req_info, ctx->reply_data, NULL);
 378         rtnl_unlock();
 379         if (ret < 0)
 380                 goto out;
 381         ret = ethnl_fill_reply_header(skb, dev, ctx->ops->hdr_attr);
 382         if (ret < 0)
 383                 goto out;
 384         ret = ctx->ops->fill_reply(skb, ctx->req_info, ctx->reply_data);
 385
 386 out:
 387         if (ctx->ops->cleanup_data)
 388                 ctx->ops->cleanup_data(ctx->reply_data);
 389         ctx->reply_data->dev = NULL;
 390         return ret;
 391 }
 392
 393 /* Default ->dumpit() handler for GET requests. Device iteration copied from
 394  * rtnl_dump_ifinfo(); we have to be more careful about device hashtable
 395  * persistence as we cannot guarantee to hold RTNL lock through the whole
 396  * function as rtnetnlink does.
 397  */
 398 static int ethnl_default_dumpit(struct sk_buff *skb,
 399                                 struct netlink_callback *cb)
 400 {
 401         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 402         struct net *net = sock_net(skb->sk);
 403         int s_idx = ctx->pos_idx;
 404         int h, idx = 0;
 405         int ret = 0;
 406         void *ehdr;
 407
 408         rtnl_lock();
 409         for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 410                 struct hlist_head *head;
 411                 struct net_device *dev;
 412                 unsigned int seq;
 413
 414                 head = &net->dev_index_head[h];
 415
 416 restart_chain:
 417                 seq = net->dev_base_seq;
 418                 cb->seq = seq;
 419                 idx = 0;
 420                 hlist_for_each_entry(dev, head, index_hlist) {
 421                         if (idx < s_idx)
 422                                 goto cont;
 423                         dev_hold(dev);
 424                         rtnl_unlock();
 425
 426                         ehdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
 427                                            cb->nlh->nlmsg_seq,
 428                                            &ethtool_genl_family, 0,
 429                                            ctx->ops->reply_cmd);
 430                         if (!ehdr) {
 431                                 dev_put(dev);
 432                                 ret = -EMSGSIZE;
 433                                 goto out;
 434                         }
 435                         ret = ethnl_default_dump_one(skb, dev, ctx);
 436                         dev_put(dev);
 437                         if (ret < 0) {
 438                                 genlmsg_cancel(skb, ehdr);
 439                                 if (ret == -EOPNOTSUPP)
 440                                         goto lock_and_cont;
 441                                 if (likely(skb->len))
 442                                         ret = skb->len;
 443                                 goto out;
 444                         }
 445                         genlmsg_end(skb, ehdr);
 446 lock_and_cont:
 447                         rtnl_lock();
 448                         if (net->dev_base_seq != seq) {
 449                                 s_idx = idx + 1;
 450                                 goto restart_chain;
 451                         }
 452 cont:
 453                         idx++;
 454                 }
 455
 456         }
 457         rtnl_unlock();
 458
 459 out:
 460         ctx->pos_hash = h;
 461         ctx->pos_idx = idx;
 462         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 463
 464         return ret;
 465 }
 466
 467 /* generic ->start() handler for GET requests */
 468 static int ethnl_default_start(struct netlink_callback *cb)
 469 {
 470         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 471         struct ethnl_reply_data *reply_data;
 472         const struct ethnl_request_ops *ops;
 473         struct ethnl_req_info *req_info;
 474         struct genlmsghdr *ghdr;
 475         int ret;
 476
 477         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
 478
 479         ghdr = nlmsg_data(cb->nlh);
 480         ops = ethnl_default_requests[ghdr->cmd];
 481         if (WARN_ONCE(!ops, "cmd %u has no ethnl_request_ops\n", ghdr->cmd))
 482                 return -EOPNOTSUPP;
 483         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 484         if (!req_info)
 485                 return -ENOMEM;
 486         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 487         if (!reply_data) {
 488                 ret = -ENOMEM;
 489                 goto free_req_info;
 490         }
 491
 492         ret = ethnl_default_parse(req_info, cb->nlh, sock_net(cb->skb->sk), ops,
 493                                   cb->extack, false);
 494         if (req_info->dev) {
 495                 /* We ignore device specification in dump requests but as the
 496                  * same parser as for non-dump (doit) requests is used, it
 497                  * would take reference to the device if it finds one
 498                  */
 499                 dev_put(req_info->dev);
 500                 req_info->dev = NULL;
 501         }
 502         if (ret < 0)
 503                 goto free_reply_data;
 504
 505         ctx->ops = ops;
 506         ctx->req_info = req_info;
 507         ctx->reply_data = reply_data;
 508         ctx->pos_hash = 0;
 509         ctx->pos_idx = 0;
 510
 511         return 0;
 512
 513 free_reply_data:
 514         kfree(reply_data);
 515 free_req_info:
 516         kfree(req_info);
 517
 518         return ret;
 519 }
 520
 521 /* default ->done() handler for GET requests */
 522 static int ethnl_default_done(struct netlink_callback *cb)
 523 {
 524         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 525
 526         kfree(ctx->reply_data);
 527         kfree(ctx->req_info);
 528
 529         return 0;
 530 }
 531
 532 static const struct ethnl_request_ops *
 533 ethnl_default_notify_ops[ETHTOOL_MSG_KERNEL_MAX + 1] = {
 534         [ETHTOOL_MSG_LINKINFO_NTF]      = &ethnl_linkinfo_request_ops,
 535         [ETHTOOL_MSG_LINKMODES_NTF]     = &ethnl_linkmodes_request_ops,
 536         [ETHTOOL_MSG_DEBUG_NTF]         = &ethnl_debug_request_ops,
 537         [ETHTOOL_MSG_WOL_NTF]           = &ethnl_wol_request_ops,
 538 };
 539
 540 /* default notification handler */
 541 static void ethnl_default_notify(struct net_device *dev, unsigned int cmd,
 542                                  const void *data)
 543 {
 544         struct ethnl_reply_data *reply_data;
 545         const struct ethnl_request_ops *ops;
 546         struct ethnl_req_info *req_info;
 547         struct sk_buff *skb;
 548         void *reply_payload;
 549         int reply_len;
 550         int ret;
 551
 552         if (WARN_ONCE(cmd > ETHTOOL_MSG_KERNEL_MAX ||
 553                       !ethnl_default_notify_ops[cmd],
 554                       "unexpected notification type %u\n", cmd))
 555                 return;
 556         ops = ethnl_default_notify_ops[cmd];
 557         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 558         if (!req_info)
 559                 return;
 560         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 561         if (!reply_data) {
 562                 kfree(req_info);
 563                 return;
 564         }
 565
 566         req_info->dev = dev;
 567         req_info->flags |= ETHTOOL_FLAG_COMPACT_BITSETS;
 568
 569         ethnl_init_reply_data(reply_data, ops, dev);
 570         ret = ops->prepare_data(req_info, reply_data, NULL);
 571         if (ret < 0)
 572                 goto err_cleanup;
 573         ret = ops->reply_size(req_info, reply_data);
 574         if (ret < 0)
 575                 goto err_cleanup;
 576         reply_len = ret;
 577         ret = -ENOMEM;
 578         skb = genlmsg_new(reply_len, GFP_KERNEL);
 579         if (!skb)
 580                 goto err_cleanup;
 581         reply_payload = ethnl_bcastmsg_put(skb, cmd);
 582         if (!reply_payload)
 583                 goto err_skb;
 584         ret = ethnl_fill_reply_header(skb, dev, ops->hdr_attr);
 585         if (ret < 0)
 586                 goto err_msg;
 587         ret = ops->fill_reply(skb, req_info, reply_data);
 588         if (ret < 0)
 589                 goto err_msg;
 590         if (ops->cleanup_data)
 591                 ops->cleanup_data(reply_data);
 592
 593         genlmsg_end(skb, reply_payload);
 594         kfree(reply_data);
 595         kfree(req_info);
 596         ethnl_multicast(skb, dev);
 597         return;
 598
 599 err_msg:
 600         WARN_ONCE(ret == -EMSGSIZE,
 601                   "calculated message payload length (%d) not sufficient\n",
 602                   reply_len);
 603 err_skb:
 604         nlmsg_free(skb);
 605 err_cleanup:
 606         if (ops->cleanup_data)
 607                 ops->cleanup_data(reply_data);
 608         kfree(reply_data);
 609         kfree(req_info);
 610         return;
 611 }
 612
 613 /* notifications */
 614
 615 typedef void (*ethnl_notify_handler_t)(struct net_device *dev, unsigned int cmd,
 616                                        const void *data);
 617
 618 static const ethnl_notify_handler_t ethnl_notify_handlers[] = {
 619         [ETHTOOL_MSG_LINKINFO_NTF]      = ethnl_default_notify,
 620         [ETHTOOL_MSG_LINKMODES_NTF]     = ethnl_default_notify,
 621         [ETHTOOL_MSG_DEBUG_NTF]         = ethnl_default_notify,
 622         [ETHTOOL_MSG_WOL_NTF]           = ethnl_default_notify,
 623 };
 624
 625 void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data)
 626 {
 627         if (unlikely(!ethnl_ok))
 628                 return;
 629         ASSERT_RTNL();
 630
 631         if (likely(cmd < ARRAY_SIZE(ethnl_notify_handlers) &&
 632                    ethnl_notify_handlers[cmd]))
 633                 ethnl_notify_handlers[cmd](dev, cmd, data);
 634         else
 635                 WARN_ONCE(1, "notification %u not implemented (dev=%s)\n",
 636                           cmd, netdev_name(dev));
 637 }
 638 EXPORT_SYMBOL(ethtool_notify);
 639
 640 /* genetlink setup */
 641
 642 static const struct genl_ops ethtool_genl_ops[] = {
 643         {
 644                 .cmd    = ETHTOOL_MSG_STRSET_GET,
 645                 .doit   = ethnl_default_doit,
 646                 .start  = ethnl_default_start,
 647                 .dumpit = ethnl_default_dumpit,
 648                 .done   = ethnl_default_done,
 649         },
 650         {
 651                 .cmd    = ETHTOOL_MSG_LINKINFO_GET,
 652                 .doit   = ethnl_default_doit,
 653                 .start  = ethnl_default_start,
 654                 .dumpit = ethnl_default_dumpit,
 655                 .done   = ethnl_default_done,
 656         },
 657         {
 658                 .cmd    = ETHTOOL_MSG_LINKINFO_SET,
 659                 .flags  = GENL_UNS_ADMIN_PERM,
 660                 .doit   = ethnl_set_linkinfo,
 661         },
 662         {
 663                 .cmd    = ETHTOOL_MSG_LINKMODES_GET,
 664                 .doit   = ethnl_default_doit,
 665                 .start  = ethnl_default_start,
 666                 .dumpit = ethnl_default_dumpit,
 667                 .done   = ethnl_default_done,
 668         },
 669         {
 670                 .cmd    = ETHTOOL_MSG_LINKMODES_SET,
 671                 .flags  = GENL_UNS_ADMIN_PERM,
 672                 .doit   = ethnl_set_linkmodes,
 673         },
 674         {
 675                 .cmd    = ETHTOOL_MSG_LINKSTATE_GET,
 676                 .doit   = ethnl_default_doit,
 677                 .start  = ethnl_default_start,
 678                 .dumpit = ethnl_default_dumpit,
 679                 .done   = ethnl_default_done,
 680         },
 681         {
 682                 .cmd    = ETHTOOL_MSG_DEBUG_GET,
 683                 .doit   = ethnl_default_doit,
 684                 .start  = ethnl_default_start,
 685                 .dumpit = ethnl_default_dumpit,
 686                 .done   = ethnl_default_done,
 687         },
 688         {
 689                 .cmd    = ETHTOOL_MSG_DEBUG_SET,
 690                 .flags  = GENL_UNS_ADMIN_PERM,
 691                 .doit   = ethnl_set_debug,
 692         },
 693         {
 694                 .cmd    = ETHTOOL_MSG_WOL_GET,
 695                 .flags  = GENL_UNS_ADMIN_PERM,
 696                 .doit   = ethnl_default_doit,
 697                 .start  = ethnl_default_start,
 698                 .dumpit = ethnl_default_dumpit,
 699                 .done   = ethnl_default_done,
 700         },
 701         {
 702                 .cmd    = ETHTOOL_MSG_WOL_SET,
 703                 .flags  = GENL_UNS_ADMIN_PERM,
 704                 .doit   = ethnl_set_wol,
 705         },
 706 };
 707
 708 static const struct genl_multicast_group ethtool_nl_mcgrps[] = {
 709         [ETHNL_MCGRP_MONITOR] = { .name = ETHTOOL_MCGRP_MONITOR_NAME },
 710 };
 711
 712 static struct genl_family ethtool_genl_family = {
 713         .name           = ETHTOOL_GENL_NAME,
 714         .version        = ETHTOOL_GENL_VERSION,
 715         .netnsok        = true,
 716         .parallel_ops   = true,
 717         .ops            = ethtool_genl_ops,
 718         .n_ops          = ARRAY_SIZE(ethtool_genl_ops),
 719         .mcgrps         = ethtool_nl_mcgrps,
 720         .n_mcgrps       = ARRAY_SIZE(ethtool_nl_mcgrps),
 721 };
 722
 723 /* module setup */
 724
 725 static int __init ethnl_init(void)
 726 {
 727         int ret;
 728
 729         ret = genl_register_family(&ethtool_genl_family);
 730         if (WARN(ret < 0, "ethtool: genetlink family registration failed"))
 731                 return ret;
 732         ethnl_ok = true;
 733
 734         return 0;
 735 }
 736
 737 subsys_initcall(ethnl_init);