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_dev_get() - 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_dev_get(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         int ret;
  44
  45         if (!header) {
  46                 NL_SET_ERR_MSG(extack, "request header missing");
  47                 return -EINVAL;
  48         }
  49         ret = nla_parse_nested(tb, ETHTOOL_A_HEADER_MAX, header,
  50                                ethnl_header_policy, extack);
  51         if (ret < 0)
  52                 return ret;
  53         devname_attr = tb[ETHTOOL_A_HEADER_DEV_NAME];
  54
  55         if (tb[ETHTOOL_A_HEADER_DEV_INDEX]) {
  56                 u32 ifindex = nla_get_u32(tb[ETHTOOL_A_HEADER_DEV_INDEX]);
  57
  58                 dev = dev_get_by_index(net, ifindex);
  59                 if (!dev) {
  60                         NL_SET_ERR_MSG_ATTR(extack,
  61                                             tb[ETHTOOL_A_HEADER_DEV_INDEX],
  62                                             "no device matches ifindex");
  63                         return -ENODEV;
  64                 }
  65                 /* if both ifindex and ifname are passed, they must match */
  66                 if (devname_attr &&
  67                     strncmp(dev->name, nla_data(devname_attr), IFNAMSIZ)) {
  68                         dev_put(dev);
  69                         NL_SET_ERR_MSG_ATTR(extack, header,
  70                                             "ifindex and name do not match");
  71                         return -ENODEV;
  72                 }
  73         } else if (devname_attr) {
  74                 dev = dev_get_by_name(net, nla_data(devname_attr));
  75                 if (!dev) {
  76                         NL_SET_ERR_MSG_ATTR(extack, devname_attr,
  77                                             "no device matches name");
  78                         return -ENODEV;
  79                 }
  80         } else if (require_dev) {
  81                 NL_SET_ERR_MSG_ATTR(extack, header,
  82                                     "neither ifindex nor name specified");
  83                 return -EINVAL;
  84         }
  85
  86         if (dev && !netif_device_present(dev)) {
  87                 dev_put(dev);
  88                 NL_SET_ERR_MSG(extack, "device not present");
  89                 return -ENODEV;
  90         }
  91
  92         req_info->dev = dev;
  93         if (tb[ETHTOOL_A_HEADER_FLAGS])
  94                 req_info->flags = nla_get_u32(tb[ETHTOOL_A_HEADER_FLAGS]);
  95
  96         return 0;
  97 }
  98
  99 /**
 100  * ethnl_fill_reply_header() - Put common header into a reply message
 101  * @skb:      skb with the message
 102  * @dev:      network device to describe in header
 103  * @attrtype: attribute type to use for the nest
 104  *
 105  * Create a nested attribute with attributes describing given network device.
 106  *
 107  * Return: 0 on success, error value (-EMSGSIZE only) on error
 108  */
 109 int ethnl_fill_reply_header(struct sk_buff *skb, struct net_device *dev,
 110                             u16 attrtype)
 111 {
 112         struct nlattr *nest;
 113
 114         if (!dev)
 115                 return 0;
 116         nest = nla_nest_start(skb, attrtype);
 117         if (!nest)
 118                 return -EMSGSIZE;
 119
 120         if (nla_put_u32(skb, ETHTOOL_A_HEADER_DEV_INDEX, (u32)dev->ifindex) ||
 121             nla_put_string(skb, ETHTOOL_A_HEADER_DEV_NAME, dev->name))
 122                 goto nla_put_failure;
 123         /* If more attributes are put into reply header, ethnl_header_size()
 124          * must be updated to account for them.
 125          */
 126
 127         nla_nest_end(skb, nest);
 128         return 0;
 129
 130 nla_put_failure:
 131         nla_nest_cancel(skb, nest);
 132         return -EMSGSIZE;
 133 }
 134
 135 /**
 136  * ethnl_reply_init() - Create skb for a reply and fill device identification
 137  * @payload:      payload length (without netlink and genetlink header)
 138  * @dev:          device the reply is about (may be null)
 139  * @cmd:          ETHTOOL_MSG_* message type for reply
 140  * @hdr_attrtype: attribute type for common header
 141  * @info:         genetlink info of the received packet we respond to
 142  * @ehdrp:        place to store payload pointer returned by genlmsg_new()
 143  *
 144  * Return: pointer to allocated skb on success, NULL on error
 145  */
 146 struct sk_buff *ethnl_reply_init(size_t payload, struct net_device *dev, u8 cmd,
 147                                  u16 hdr_attrtype, struct genl_info *info,
 148                                  void **ehdrp)
 149 {
 150         struct sk_buff *skb;
 151
 152         skb = genlmsg_new(payload, GFP_KERNEL);
 153         if (!skb)
 154                 goto err;
 155         *ehdrp = genlmsg_put_reply(skb, info, &ethtool_genl_family, 0, cmd);
 156         if (!*ehdrp)
 157                 goto err_free;
 158
 159         if (dev) {
 160                 int ret;
 161
 162                 ret = ethnl_fill_reply_header(skb, dev, hdr_attrtype);
 163                 if (ret < 0)
 164                         goto err_free;
 165         }
 166         return skb;
 167
 168 err_free:
 169         nlmsg_free(skb);
 170 err:
 171         if (info)
 172                 GENL_SET_ERR_MSG(info, "failed to setup reply message");
 173         return NULL;
 174 }
 175
 176 static void *ethnl_bcastmsg_put(struct sk_buff *skb, u8 cmd)
 177 {
 178         return genlmsg_put(skb, 0, ++ethnl_bcast_seq, &ethtool_genl_family, 0,
 179                            cmd);
 180 }
 181
 182 static int ethnl_multicast(struct sk_buff *skb, struct net_device *dev)
 183 {
 184         return genlmsg_multicast_netns(&ethtool_genl_family, dev_net(dev), skb,
 185                                        0, ETHNL_MCGRP_MONITOR, GFP_KERNEL);
 186 }
 187
 188 /* GET request helpers */
 189
 190 /**
 191  * struct ethnl_dump_ctx - context structure for generic dumpit() callback
 192  * @ops:        request ops of currently processed message type
 193  * @req_info:   parsed request header of processed request
 194  * @reply_data: data needed to compose the reply
 195  * @pos_hash:   saved iteration position - hashbucket
 196  * @pos_idx:    saved iteration position - index
 197  *
 198  * These parameters are kept in struct netlink_callback as context preserved
 199  * between iterations. They are initialized by ethnl_default_start() and used
 200  * in ethnl_default_dumpit() and ethnl_default_done().
 201  */
 202 struct ethnl_dump_ctx {
 203         const struct ethnl_request_ops  *ops;
 204         struct ethnl_req_info           *req_info;
 205         struct ethnl_reply_data         *reply_data;
 206         int                             pos_hash;
 207         int                             pos_idx;
 208 };
 209
 210 static const struct ethnl_request_ops *
 211 ethnl_default_requests[__ETHTOOL_MSG_USER_CNT] = {
 212         [ETHTOOL_MSG_STRSET_GET]        = &ethnl_strset_request_ops,
 213         [ETHTOOL_MSG_LINKINFO_GET]      = &ethnl_linkinfo_request_ops,
 214         [ETHTOOL_MSG_LINKMODES_GET]     = &ethnl_linkmodes_request_ops,
 215         [ETHTOOL_MSG_LINKSTATE_GET]     = &ethnl_linkstate_request_ops,
 216         [ETHTOOL_MSG_DEBUG_GET]         = &ethnl_debug_request_ops,
 217         [ETHTOOL_MSG_WOL_GET]           = &ethnl_wol_request_ops,
 218         [ETHTOOL_MSG_FEATURES_GET]      = &ethnl_features_request_ops,
 219         [ETHTOOL_MSG_PRIVFLAGS_GET]     = &ethnl_privflags_request_ops,
 220 };
 221
 222 static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
 223 {
 224         return (struct ethnl_dump_ctx *)cb->ctx;
 225 }
 226
 227 /**
 228  * ethnl_default_parse() - Parse request message
 229  * @req_info:    pointer to structure to put data into
 230  * @nlhdr:       pointer to request message header
 231  * @net:         request netns
 232  * @request_ops: struct request_ops for request type
 233  * @extack:      netlink extack for error reporting
 234  * @require_dev: fail if no device identified in header
 235  *
 236  * Parse universal request header and call request specific ->parse_request()
 237  * callback (if defined) to parse the rest of the message.
 238  *
 239  * Return: 0 on success or negative error code
 240  */
 241 static int ethnl_default_parse(struct ethnl_req_info *req_info,
 242                                const struct nlmsghdr *nlhdr, struct net *net,
 243                                const struct ethnl_request_ops *request_ops,
 244                                struct netlink_ext_ack *extack, bool require_dev)
 245 {
 246         struct nlattr **tb;
 247         int ret;
 248
 249         tb = kmalloc_array(request_ops->max_attr + 1, sizeof(tb[0]),
 250                            GFP_KERNEL);
 251         if (!tb)
 252                 return -ENOMEM;
 253
 254         ret = nlmsg_parse(nlhdr, GENL_HDRLEN, tb, request_ops->max_attr,
 255                           request_ops->request_policy, extack);
 256         if (ret < 0)
 257                 goto out;
 258         ret = ethnl_parse_header_dev_get(req_info, tb[request_ops->hdr_attr],
 259                                          net, extack, require_dev);
 260         if (ret < 0)
 261                 goto out;
 262
 263         if (request_ops->parse_request) {
 264                 ret = request_ops->parse_request(req_info, tb, extack);
 265                 if (ret < 0)
 266                         goto out;
 267         }
 268
 269         ret = 0;
 270 out:
 271         kfree(tb);
 272         return ret;
 273 }
 274
 275 /**
 276  * ethnl_init_reply_data() - Initialize reply data for GET request
 277  * @reply_data: pointer to embedded struct ethnl_reply_data
 278  * @ops:        instance of struct ethnl_request_ops describing the layout
 279  * @dev:        network device to initialize the reply for
 280  *
 281  * Fills the reply data part with zeros and sets the dev member. Must be called
 282  * before calling the ->fill_reply() callback (for each iteration when handling
 283  * dump requests).
 284  */
 285 static void ethnl_init_reply_data(struct ethnl_reply_data *reply_data,
 286                                   const struct ethnl_request_ops *ops,
 287                                   struct net_device *dev)
 288 {
 289         memset(reply_data, 0, ops->reply_data_size);
 290         reply_data->dev = dev;
 291 }
 292
 293 /* default ->doit() handler for GET type requests */
 294 static int ethnl_default_doit(struct sk_buff *skb, struct genl_info *info)
 295 {
 296         struct ethnl_reply_data *reply_data = NULL;
 297         struct ethnl_req_info *req_info = NULL;
 298         const u8 cmd = info->genlhdr->cmd;
 299         const struct ethnl_request_ops *ops;
 300         struct sk_buff *rskb;
 301         void *reply_payload;
 302         int reply_len;
 303         int ret;
 304
 305         ops = ethnl_default_requests[cmd];
 306         if (WARN_ONCE(!ops, "cmd %u has no ethnl_request_ops\n", cmd))
 307                 return -EOPNOTSUPP;
 308         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 309         if (!req_info)
 310                 return -ENOMEM;
 311         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 312         if (!reply_data) {
 313                 kfree(req_info);
 314                 return -ENOMEM;
 315         }
 316
 317         ret = ethnl_default_parse(req_info, info->nlhdr, genl_info_net(info), ops,
 318                                   info->extack, !ops->allow_nodev_do);
 319         if (ret < 0)
 320                 goto err_dev;
 321         ethnl_init_reply_data(reply_data, ops, req_info->dev);
 322
 323         rtnl_lock();
 324         ret = ops->prepare_data(req_info, reply_data, info);
 325         rtnl_unlock();
 326         if (ret < 0)
 327                 goto err_cleanup;
 328         ret = ops->reply_size(req_info, reply_data);
 329         if (ret < 0)
 330                 goto err_cleanup;
 331         reply_len = ret;
 332         ret = -ENOMEM;
 333         rskb = ethnl_reply_init(reply_len, req_info->dev, ops->reply_cmd,
 334                                 ops->hdr_attr, info, &reply_payload);
 335         if (!rskb)
 336                 goto err_cleanup;
 337         ret = ops->fill_reply(rskb, req_info, reply_data);
 338         if (ret < 0)
 339                 goto err_msg;
 340         if (ops->cleanup_data)
 341                 ops->cleanup_data(reply_data);
 342
 343         genlmsg_end(rskb, reply_payload);
 344         if (req_info->dev)
 345                 dev_put(req_info->dev);
 346         kfree(reply_data);
 347         kfree(req_info);
 348         return genlmsg_reply(rskb, info);
 349
 350 err_msg:
 351         WARN_ONCE(ret == -EMSGSIZE, "calculated message payload length (%d) not sufficient\n", reply_len);
 352         nlmsg_free(rskb);
 353 err_cleanup:
 354         if (ops->cleanup_data)
 355                 ops->cleanup_data(reply_data);
 356 err_dev:
 357         if (req_info->dev)
 358                 dev_put(req_info->dev);
 359         kfree(reply_data);
 360         kfree(req_info);
 361         return ret;
 362 }
 363
 364 static int ethnl_default_dump_one(struct sk_buff *skb, struct net_device *dev,
 365                                   const struct ethnl_dump_ctx *ctx)
 366 {
 367         int ret;
 368
 369         ethnl_init_reply_data(ctx->reply_data, ctx->ops, dev);
 370         rtnl_lock();
 371         ret = ctx->ops->prepare_data(ctx->req_info, ctx->reply_data, NULL);
 372         rtnl_unlock();
 373         if (ret < 0)
 374                 goto out;
 375         ret = ethnl_fill_reply_header(skb, dev, ctx->ops->hdr_attr);
 376         if (ret < 0)
 377                 goto out;
 378         ret = ctx->ops->fill_reply(skb, ctx->req_info, ctx->reply_data);
 379
 380 out:
 381         if (ctx->ops->cleanup_data)
 382                 ctx->ops->cleanup_data(ctx->reply_data);
 383         ctx->reply_data->dev = NULL;
 384         return ret;
 385 }
 386
 387 /* Default ->dumpit() handler for GET requests. Device iteration copied from
 388  * rtnl_dump_ifinfo(); we have to be more careful about device hashtable
 389  * persistence as we cannot guarantee to hold RTNL lock through the whole
 390  * function as rtnetnlink does.
 391  */
 392 static int ethnl_default_dumpit(struct sk_buff *skb,
 393                                 struct netlink_callback *cb)
 394 {
 395         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 396         struct net *net = sock_net(skb->sk);
 397         int s_idx = ctx->pos_idx;
 398         int h, idx = 0;
 399         int ret = 0;
 400         void *ehdr;
 401
 402         rtnl_lock();
 403         for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 404                 struct hlist_head *head;
 405                 struct net_device *dev;
 406                 unsigned int seq;
 407
 408                 head = &net->dev_index_head[h];
 409
 410 restart_chain:
 411                 seq = net->dev_base_seq;
 412                 cb->seq = seq;
 413                 idx = 0;
 414                 hlist_for_each_entry(dev, head, index_hlist) {
 415                         if (idx < s_idx)
 416                                 goto cont;
 417                         dev_hold(dev);
 418                         rtnl_unlock();
 419
 420                         ehdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
 421                                            cb->nlh->nlmsg_seq,
 422                                            &ethtool_genl_family, 0,
 423                                            ctx->ops->reply_cmd);
 424                         if (!ehdr) {
 425                                 dev_put(dev);
 426                                 ret = -EMSGSIZE;
 427                                 goto out;
 428                         }
 429                         ret = ethnl_default_dump_one(skb, dev, ctx);
 430                         dev_put(dev);
 431                         if (ret < 0) {
 432                                 genlmsg_cancel(skb, ehdr);
 433                                 if (ret == -EOPNOTSUPP)
 434                                         goto lock_and_cont;
 435                                 if (likely(skb->len))
 436                                         ret = skb->len;
 437                                 goto out;
 438                         }
 439                         genlmsg_end(skb, ehdr);
 440 lock_and_cont:
 441                         rtnl_lock();
 442                         if (net->dev_base_seq != seq) {
 443                                 s_idx = idx + 1;
 444                                 goto restart_chain;
 445                         }
 446 cont:
 447                         idx++;
 448                 }
 449
 450         }
 451         rtnl_unlock();
 452
 453 out:
 454         ctx->pos_hash = h;
 455         ctx->pos_idx = idx;
 456         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 457
 458         return ret;
 459 }
 460
 461 /* generic ->start() handler for GET requests */
 462 static int ethnl_default_start(struct netlink_callback *cb)
 463 {
 464         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 465         struct ethnl_reply_data *reply_data;
 466         const struct ethnl_request_ops *ops;
 467         struct ethnl_req_info *req_info;
 468         struct genlmsghdr *ghdr;
 469         int ret;
 470
 471         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
 472
 473         ghdr = nlmsg_data(cb->nlh);
 474         ops = ethnl_default_requests[ghdr->cmd];
 475         if (WARN_ONCE(!ops, "cmd %u has no ethnl_request_ops\n", ghdr->cmd))
 476                 return -EOPNOTSUPP;
 477         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 478         if (!req_info)
 479                 return -ENOMEM;
 480         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 481         if (!reply_data) {
 482                 ret = -ENOMEM;
 483                 goto free_req_info;
 484         }
 485
 486         ret = ethnl_default_parse(req_info, cb->nlh, sock_net(cb->skb->sk), ops,
 487                                   cb->extack, false);
 488         if (req_info->dev) {
 489                 /* We ignore device specification in dump requests but as the
 490                  * same parser as for non-dump (doit) requests is used, it
 491                  * would take reference to the device if it finds one
 492                  */
 493                 dev_put(req_info->dev);
 494                 req_info->dev = NULL;
 495         }
 496         if (ret < 0)
 497                 goto free_reply_data;
 498
 499         ctx->ops = ops;
 500         ctx->req_info = req_info;
 501         ctx->reply_data = reply_data;
 502         ctx->pos_hash = 0;
 503         ctx->pos_idx = 0;
 504
 505         return 0;
 506
 507 free_reply_data:
 508         kfree(reply_data);
 509 free_req_info:
 510         kfree(req_info);
 511
 512         return ret;
 513 }
 514
 515 /* default ->done() handler for GET requests */
 516 static int ethnl_default_done(struct netlink_callback *cb)
 517 {
 518         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 519
 520         kfree(ctx->reply_data);
 521         kfree(ctx->req_info);
 522
 523         return 0;
 524 }
 525
 526 static const struct ethnl_request_ops *
 527 ethnl_default_notify_ops[ETHTOOL_MSG_KERNEL_MAX + 1] = {
 528         [ETHTOOL_MSG_LINKINFO_NTF]      = &ethnl_linkinfo_request_ops,
 529         [ETHTOOL_MSG_LINKMODES_NTF]     = &ethnl_linkmodes_request_ops,
 530         [ETHTOOL_MSG_DEBUG_NTF]         = &ethnl_debug_request_ops,
 531         [ETHTOOL_MSG_WOL_NTF]           = &ethnl_wol_request_ops,
 532         [ETHTOOL_MSG_FEATURES_NTF]      = &ethnl_features_request_ops,
 533         [ETHTOOL_MSG_PRIVFLAGS_NTF]     = &ethnl_privflags_request_ops,
 534 };
 535
 536 /* default notification handler */
 537 static void ethnl_default_notify(struct net_device *dev, unsigned int cmd,
 538                                  const void *data)
 539 {
 540         struct ethnl_reply_data *reply_data;
 541         const struct ethnl_request_ops *ops;
 542         struct ethnl_req_info *req_info;
 543         struct sk_buff *skb;
 544         void *reply_payload;
 545         int reply_len;
 546         int ret;
 547
 548         if (WARN_ONCE(cmd > ETHTOOL_MSG_KERNEL_MAX ||
 549                       !ethnl_default_notify_ops[cmd],
 550                       "unexpected notification type %u\n", cmd))
 551                 return;
 552         ops = ethnl_default_notify_ops[cmd];
 553         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 554         if (!req_info)
 555                 return;
 556         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 557         if (!reply_data) {
 558                 kfree(req_info);
 559                 return;
 560         }
 561
 562         req_info->dev = dev;
 563         req_info->flags |= ETHTOOL_FLAG_COMPACT_BITSETS;
 564
 565         ethnl_init_reply_data(reply_data, ops, dev);
 566         ret = ops->prepare_data(req_info, reply_data, NULL);
 567         if (ret < 0)
 568                 goto err_cleanup;
 569         ret = ops->reply_size(req_info, reply_data);
 570         if (ret < 0)
 571                 goto err_cleanup;
 572         reply_len = ret;
 573         ret = -ENOMEM;
 574         skb = genlmsg_new(reply_len, GFP_KERNEL);
 575         if (!skb)
 576                 goto err_cleanup;
 577         reply_payload = ethnl_bcastmsg_put(skb, cmd);
 578         if (!reply_payload)
 579                 goto err_skb;
 580         ret = ethnl_fill_reply_header(skb, dev, ops->hdr_attr);
 581         if (ret < 0)
 582                 goto err_msg;
 583         ret = ops->fill_reply(skb, req_info, reply_data);
 584         if (ret < 0)
 585                 goto err_msg;
 586         if (ops->cleanup_data)
 587                 ops->cleanup_data(reply_data);
 588
 589         genlmsg_end(skb, reply_payload);
 590         kfree(reply_data);
 591         kfree(req_info);
 592         ethnl_multicast(skb, dev);
 593         return;
 594
 595 err_msg:
 596         WARN_ONCE(ret == -EMSGSIZE,
 597                   "calculated message payload length (%d) not sufficient\n",
 598                   reply_len);
 599 err_skb:
 600         nlmsg_free(skb);
 601 err_cleanup:
 602         if (ops->cleanup_data)
 603                 ops->cleanup_data(reply_data);
 604         kfree(reply_data);
 605         kfree(req_info);
 606         return;
 607 }
 608
 609 /* notifications */
 610
 611 typedef void (*ethnl_notify_handler_t)(struct net_device *dev, unsigned int cmd,
 612                                        const void *data);
 613
 614 static const ethnl_notify_handler_t ethnl_notify_handlers[] = {
 615         [ETHTOOL_MSG_LINKINFO_NTF]      = ethnl_default_notify,
 616         [ETHTOOL_MSG_LINKMODES_NTF]     = ethnl_default_notify,
 617         [ETHTOOL_MSG_DEBUG_NTF]         = ethnl_default_notify,
 618         [ETHTOOL_MSG_WOL_NTF]           = ethnl_default_notify,
 619         [ETHTOOL_MSG_FEATURES_NTF]      = ethnl_default_notify,
 620         [ETHTOOL_MSG_PRIVFLAGS_NTF]     = ethnl_default_notify,
 621 };
 622
 623 void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data)
 624 {
 625         if (unlikely(!ethnl_ok))
 626                 return;
 627         ASSERT_RTNL();
 628
 629         if (likely(cmd < ARRAY_SIZE(ethnl_notify_handlers) &&
 630                    ethnl_notify_handlers[cmd]))
 631                 ethnl_notify_handlers[cmd](dev, cmd, data);
 632         else
 633                 WARN_ONCE(1, "notification %u not implemented (dev=%s)\n",
 634                           cmd, netdev_name(dev));
 635 }
 636 EXPORT_SYMBOL(ethtool_notify);
 637
 638 static void ethnl_notify_features(struct netdev_notifier_info *info)
 639 {
 640         struct net_device *dev = netdev_notifier_info_to_dev(info);
 641
 642         ethtool_notify(dev, ETHTOOL_MSG_FEATURES_NTF, NULL);
 643 }
 644
 645 static int ethnl_netdev_event(struct notifier_block *this, unsigned long event,
 646                               void *ptr)
 647 {
 648         switch (event) {
 649         case NETDEV_FEAT_CHANGE:
 650                 ethnl_notify_features(ptr);
 651                 break;
 652         }
 653
 654         return NOTIFY_DONE;
 655 }
 656
 657 static struct notifier_block ethnl_netdev_notifier = {
 658         .notifier_call = ethnl_netdev_event,
 659 };
 660
 661 /* genetlink setup */
 662
 663 static const struct genl_ops ethtool_genl_ops[] = {
 664         {
 665                 .cmd    = ETHTOOL_MSG_STRSET_GET,
 666                 .doit   = ethnl_default_doit,
 667                 .start  = ethnl_default_start,
 668                 .dumpit = ethnl_default_dumpit,
 669                 .done   = ethnl_default_done,
 670         },
 671         {
 672                 .cmd    = ETHTOOL_MSG_LINKINFO_GET,
 673                 .doit   = ethnl_default_doit,
 674                 .start  = ethnl_default_start,
 675                 .dumpit = ethnl_default_dumpit,
 676                 .done   = ethnl_default_done,
 677         },
 678         {
 679                 .cmd    = ETHTOOL_MSG_LINKINFO_SET,
 680                 .flags  = GENL_UNS_ADMIN_PERM,
 681                 .doit   = ethnl_set_linkinfo,
 682         },
 683         {
 684                 .cmd    = ETHTOOL_MSG_LINKMODES_GET,
 685                 .doit   = ethnl_default_doit,
 686                 .start  = ethnl_default_start,
 687                 .dumpit = ethnl_default_dumpit,
 688                 .done   = ethnl_default_done,
 689         },
 690         {
 691                 .cmd    = ETHTOOL_MSG_LINKMODES_SET,
 692                 .flags  = GENL_UNS_ADMIN_PERM,
 693                 .doit   = ethnl_set_linkmodes,
 694         },
 695         {
 696                 .cmd    = ETHTOOL_MSG_LINKSTATE_GET,
 697                 .doit   = ethnl_default_doit,
 698                 .start  = ethnl_default_start,
 699                 .dumpit = ethnl_default_dumpit,
 700                 .done   = ethnl_default_done,
 701         },
 702         {
 703                 .cmd    = ETHTOOL_MSG_DEBUG_GET,
 704                 .doit   = ethnl_default_doit,
 705                 .start  = ethnl_default_start,
 706                 .dumpit = ethnl_default_dumpit,
 707                 .done   = ethnl_default_done,
 708         },
 709         {
 710                 .cmd    = ETHTOOL_MSG_DEBUG_SET,
 711                 .flags  = GENL_UNS_ADMIN_PERM,
 712                 .doit   = ethnl_set_debug,
 713         },
 714         {
 715                 .cmd    = ETHTOOL_MSG_WOL_GET,
 716                 .flags  = GENL_UNS_ADMIN_PERM,
 717                 .doit   = ethnl_default_doit,
 718                 .start  = ethnl_default_start,
 719                 .dumpit = ethnl_default_dumpit,
 720                 .done   = ethnl_default_done,
 721         },
 722         {
 723                 .cmd    = ETHTOOL_MSG_WOL_SET,
 724                 .flags  = GENL_UNS_ADMIN_PERM,
 725                 .doit   = ethnl_set_wol,
 726         },
 727         {
 728                 .cmd    = ETHTOOL_MSG_FEATURES_GET,
 729                 .doit   = ethnl_default_doit,
 730                 .start  = ethnl_default_start,
 731                 .dumpit = ethnl_default_dumpit,
 732                 .done   = ethnl_default_done,
 733         },
 734         {
 735                 .cmd    = ETHTOOL_MSG_FEATURES_SET,
 736                 .flags  = GENL_UNS_ADMIN_PERM,
 737                 .doit   = ethnl_set_features,
 738         },
 739         {
 740                 .cmd    = ETHTOOL_MSG_PRIVFLAGS_GET,
 741                 .doit   = ethnl_default_doit,
 742                 .start  = ethnl_default_start,
 743                 .dumpit = ethnl_default_dumpit,
 744                 .done   = ethnl_default_done,
 745         },
 746         {
 747                 .cmd    = ETHTOOL_MSG_PRIVFLAGS_SET,
 748                 .flags  = GENL_UNS_ADMIN_PERM,
 749                 .doit   = ethnl_set_privflags,
 750         },
 751 };
 752
 753 static const struct genl_multicast_group ethtool_nl_mcgrps[] = {
 754         [ETHNL_MCGRP_MONITOR] = { .name = ETHTOOL_MCGRP_MONITOR_NAME },
 755 };
 756
 757 static struct genl_family ethtool_genl_family = {
 758         .name           = ETHTOOL_GENL_NAME,
 759         .version        = ETHTOOL_GENL_VERSION,
 760         .netnsok        = true,
 761         .parallel_ops   = true,
 762         .ops            = ethtool_genl_ops,
 763         .n_ops          = ARRAY_SIZE(ethtool_genl_ops),
 764         .mcgrps         = ethtool_nl_mcgrps,
 765         .n_mcgrps       = ARRAY_SIZE(ethtool_nl_mcgrps),
 766 };
 767
 768 /* module setup */
 769
 770 static int __init ethnl_init(void)
 771 {
 772         int ret;
 773
 774         ret = genl_register_family(&ethtool_genl_family);
 775         if (WARN(ret < 0, "ethtool: genetlink family registration failed"))
 776                 return ret;
 777         ethnl_ok = true;
 778
 779         ret = register_netdevice_notifier(&ethnl_netdev_notifier);
 780         WARN(ret < 0, "ethtool: net device notifier registration failed");
 781         return ret;
 782 }
 783
 784 subsys_initcall(ethnl_init);