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         [ETHTOOL_MSG_RINGS_GET]         = &ethnl_rings_request_ops,
 221         [ETHTOOL_MSG_CHANNELS_GET]      = &ethnl_channels_request_ops,
 222 };
 223
 224 static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
 225 {
 226         return (struct ethnl_dump_ctx *)cb->ctx;
 227 }
 228
 229 /**
 230  * ethnl_default_parse() - Parse request message
 231  * @req_info:    pointer to structure to put data into
 232  * @nlhdr:       pointer to request message header
 233  * @net:         request netns
 234  * @request_ops: struct request_ops for request type
 235  * @extack:      netlink extack for error reporting
 236  * @require_dev: fail if no device identified in header
 237  *
 238  * Parse universal request header and call request specific ->parse_request()
 239  * callback (if defined) to parse the rest of the message.
 240  *
 241  * Return: 0 on success or negative error code
 242  */
 243 static int ethnl_default_parse(struct ethnl_req_info *req_info,
 244                                const struct nlmsghdr *nlhdr, struct net *net,
 245                                const struct ethnl_request_ops *request_ops,
 246                                struct netlink_ext_ack *extack, bool require_dev)
 247 {
 248         struct nlattr **tb;
 249         int ret;
 250
 251         tb = kmalloc_array(request_ops->max_attr + 1, sizeof(tb[0]),
 252                            GFP_KERNEL);
 253         if (!tb)
 254                 return -ENOMEM;
 255
 256         ret = nlmsg_parse(nlhdr, GENL_HDRLEN, tb, request_ops->max_attr,
 257                           request_ops->request_policy, extack);
 258         if (ret < 0)
 259                 goto out;
 260         ret = ethnl_parse_header_dev_get(req_info, tb[request_ops->hdr_attr],
 261                                          net, extack, require_dev);
 262         if (ret < 0)
 263                 goto out;
 264
 265         if (request_ops->parse_request) {
 266                 ret = request_ops->parse_request(req_info, tb, extack);
 267                 if (ret < 0)
 268                         goto out;
 269         }
 270
 271         ret = 0;
 272 out:
 273         kfree(tb);
 274         return ret;
 275 }
 276
 277 /**
 278  * ethnl_init_reply_data() - Initialize reply data for GET request
 279  * @reply_data: pointer to embedded struct ethnl_reply_data
 280  * @ops:        instance of struct ethnl_request_ops describing the layout
 281  * @dev:        network device to initialize the reply for
 282  *
 283  * Fills the reply data part with zeros and sets the dev member. Must be called
 284  * before calling the ->fill_reply() callback (for each iteration when handling
 285  * dump requests).
 286  */
 287 static void ethnl_init_reply_data(struct ethnl_reply_data *reply_data,
 288                                   const struct ethnl_request_ops *ops,
 289                                   struct net_device *dev)
 290 {
 291         memset(reply_data, 0, ops->reply_data_size);
 292         reply_data->dev = dev;
 293 }
 294
 295 /* default ->doit() handler for GET type requests */
 296 static int ethnl_default_doit(struct sk_buff *skb, struct genl_info *info)
 297 {
 298         struct ethnl_reply_data *reply_data = NULL;
 299         struct ethnl_req_info *req_info = NULL;
 300         const u8 cmd = info->genlhdr->cmd;
 301         const struct ethnl_request_ops *ops;
 302         struct sk_buff *rskb;
 303         void *reply_payload;
 304         int reply_len;
 305         int ret;
 306
 307         ops = ethnl_default_requests[cmd];
 308         if (WARN_ONCE(!ops, "cmd %u has no ethnl_request_ops\n", cmd))
 309                 return -EOPNOTSUPP;
 310         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 311         if (!req_info)
 312                 return -ENOMEM;
 313         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 314         if (!reply_data) {
 315                 kfree(req_info);
 316                 return -ENOMEM;
 317         }
 318
 319         ret = ethnl_default_parse(req_info, info->nlhdr, genl_info_net(info), ops,
 320                                   info->extack, !ops->allow_nodev_do);
 321         if (ret < 0)
 322                 goto err_dev;
 323         ethnl_init_reply_data(reply_data, ops, req_info->dev);
 324
 325         rtnl_lock();
 326         ret = ops->prepare_data(req_info, reply_data, info);
 327         rtnl_unlock();
 328         if (ret < 0)
 329                 goto err_cleanup;
 330         ret = ops->reply_size(req_info, reply_data);
 331         if (ret < 0)
 332                 goto err_cleanup;
 333         reply_len = ret;
 334         ret = -ENOMEM;
 335         rskb = ethnl_reply_init(reply_len, req_info->dev, ops->reply_cmd,
 336                                 ops->hdr_attr, info, &reply_payload);
 337         if (!rskb)
 338                 goto err_cleanup;
 339         ret = ops->fill_reply(rskb, req_info, reply_data);
 340         if (ret < 0)
 341                 goto err_msg;
 342         if (ops->cleanup_data)
 343                 ops->cleanup_data(reply_data);
 344
 345         genlmsg_end(rskb, reply_payload);
 346         if (req_info->dev)
 347                 dev_put(req_info->dev);
 348         kfree(reply_data);
 349         kfree(req_info);
 350         return genlmsg_reply(rskb, info);
 351
 352 err_msg:
 353         WARN_ONCE(ret == -EMSGSIZE, "calculated message payload length (%d) not sufficient\n", reply_len);
 354         nlmsg_free(rskb);
 355 err_cleanup:
 356         if (ops->cleanup_data)
 357                 ops->cleanup_data(reply_data);
 358 err_dev:
 359         if (req_info->dev)
 360                 dev_put(req_info->dev);
 361         kfree(reply_data);
 362         kfree(req_info);
 363         return ret;
 364 }
 365
 366 static int ethnl_default_dump_one(struct sk_buff *skb, struct net_device *dev,
 367                                   const struct ethnl_dump_ctx *ctx)
 368 {
 369         int ret;
 370
 371         ethnl_init_reply_data(ctx->reply_data, ctx->ops, dev);
 372         rtnl_lock();
 373         ret = ctx->ops->prepare_data(ctx->req_info, ctx->reply_data, NULL);
 374         rtnl_unlock();
 375         if (ret < 0)
 376                 goto out;
 377         ret = ethnl_fill_reply_header(skb, dev, ctx->ops->hdr_attr);
 378         if (ret < 0)
 379                 goto out;
 380         ret = ctx->ops->fill_reply(skb, ctx->req_info, ctx->reply_data);
 381
 382 out:
 383         if (ctx->ops->cleanup_data)
 384                 ctx->ops->cleanup_data(ctx->reply_data);
 385         ctx->reply_data->dev = NULL;
 386         return ret;
 387 }
 388
 389 /* Default ->dumpit() handler for GET requests. Device iteration copied from
 390  * rtnl_dump_ifinfo(); we have to be more careful about device hashtable
 391  * persistence as we cannot guarantee to hold RTNL lock through the whole
 392  * function as rtnetnlink does.
 393  */
 394 static int ethnl_default_dumpit(struct sk_buff *skb,
 395                                 struct netlink_callback *cb)
 396 {
 397         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 398         struct net *net = sock_net(skb->sk);
 399         int s_idx = ctx->pos_idx;
 400         int h, idx = 0;
 401         int ret = 0;
 402         void *ehdr;
 403
 404         rtnl_lock();
 405         for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 406                 struct hlist_head *head;
 407                 struct net_device *dev;
 408                 unsigned int seq;
 409
 410                 head = &net->dev_index_head[h];
 411
 412 restart_chain:
 413                 seq = net->dev_base_seq;
 414                 cb->seq = seq;
 415                 idx = 0;
 416                 hlist_for_each_entry(dev, head, index_hlist) {
 417                         if (idx < s_idx)
 418                                 goto cont;
 419                         dev_hold(dev);
 420                         rtnl_unlock();
 421
 422                         ehdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
 423                                            cb->nlh->nlmsg_seq,
 424                                            &ethtool_genl_family, 0,
 425                                            ctx->ops->reply_cmd);
 426                         if (!ehdr) {
 427                                 dev_put(dev);
 428                                 ret = -EMSGSIZE;
 429                                 goto out;
 430                         }
 431                         ret = ethnl_default_dump_one(skb, dev, ctx);
 432                         dev_put(dev);
 433                         if (ret < 0) {
 434                                 genlmsg_cancel(skb, ehdr);
 435                                 if (ret == -EOPNOTSUPP)
 436                                         goto lock_and_cont;
 437                                 if (likely(skb->len))
 438                                         ret = skb->len;
 439                                 goto out;
 440                         }
 441                         genlmsg_end(skb, ehdr);
 442 lock_and_cont:
 443                         rtnl_lock();
 444                         if (net->dev_base_seq != seq) {
 445                                 s_idx = idx + 1;
 446                                 goto restart_chain;
 447                         }
 448 cont:
 449                         idx++;
 450                 }
 451
 452         }
 453         rtnl_unlock();
 454
 455 out:
 456         ctx->pos_hash = h;
 457         ctx->pos_idx = idx;
 458         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 459
 460         return ret;
 461 }
 462
 463 /* generic ->start() handler for GET requests */
 464 static int ethnl_default_start(struct netlink_callback *cb)
 465 {
 466         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 467         struct ethnl_reply_data *reply_data;
 468         const struct ethnl_request_ops *ops;
 469         struct ethnl_req_info *req_info;
 470         struct genlmsghdr *ghdr;
 471         int ret;
 472
 473         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
 474
 475         ghdr = nlmsg_data(cb->nlh);
 476         ops = ethnl_default_requests[ghdr->cmd];
 477         if (WARN_ONCE(!ops, "cmd %u has no ethnl_request_ops\n", ghdr->cmd))
 478                 return -EOPNOTSUPP;
 479         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 480         if (!req_info)
 481                 return -ENOMEM;
 482         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 483         if (!reply_data) {
 484                 ret = -ENOMEM;
 485                 goto free_req_info;
 486         }
 487
 488         ret = ethnl_default_parse(req_info, cb->nlh, sock_net(cb->skb->sk), ops,
 489                                   cb->extack, false);
 490         if (req_info->dev) {
 491                 /* We ignore device specification in dump requests but as the
 492                  * same parser as for non-dump (doit) requests is used, it
 493                  * would take reference to the device if it finds one
 494                  */
 495                 dev_put(req_info->dev);
 496                 req_info->dev = NULL;
 497         }
 498         if (ret < 0)
 499                 goto free_reply_data;
 500
 501         ctx->ops = ops;
 502         ctx->req_info = req_info;
 503         ctx->reply_data = reply_data;
 504         ctx->pos_hash = 0;
 505         ctx->pos_idx = 0;
 506
 507         return 0;
 508
 509 free_reply_data:
 510         kfree(reply_data);
 511 free_req_info:
 512         kfree(req_info);
 513
 514         return ret;
 515 }
 516
 517 /* default ->done() handler for GET requests */
 518 static int ethnl_default_done(struct netlink_callback *cb)
 519 {
 520         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 521
 522         kfree(ctx->reply_data);
 523         kfree(ctx->req_info);
 524
 525         return 0;
 526 }
 527
 528 static const struct ethnl_request_ops *
 529 ethnl_default_notify_ops[ETHTOOL_MSG_KERNEL_MAX + 1] = {
 530         [ETHTOOL_MSG_LINKINFO_NTF]      = &ethnl_linkinfo_request_ops,
 531         [ETHTOOL_MSG_LINKMODES_NTF]     = &ethnl_linkmodes_request_ops,
 532         [ETHTOOL_MSG_DEBUG_NTF]         = &ethnl_debug_request_ops,
 533         [ETHTOOL_MSG_WOL_NTF]           = &ethnl_wol_request_ops,
 534         [ETHTOOL_MSG_FEATURES_NTF]      = &ethnl_features_request_ops,
 535         [ETHTOOL_MSG_PRIVFLAGS_NTF]     = &ethnl_privflags_request_ops,
 536         [ETHTOOL_MSG_RINGS_NTF]         = &ethnl_rings_request_ops,
 537         [ETHTOOL_MSG_CHANNELS_NTF]      = &ethnl_channels_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         [ETHTOOL_MSG_FEATURES_NTF]      = ethnl_default_notify,
 624         [ETHTOOL_MSG_PRIVFLAGS_NTF]     = ethnl_default_notify,
 625         [ETHTOOL_MSG_RINGS_NTF]         = ethnl_default_notify,
 626         [ETHTOOL_MSG_CHANNELS_NTF]      = ethnl_default_notify,
 627 };
 628
 629 void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data)
 630 {
 631         if (unlikely(!ethnl_ok))
 632                 return;
 633         ASSERT_RTNL();
 634
 635         if (likely(cmd < ARRAY_SIZE(ethnl_notify_handlers) &&
 636                    ethnl_notify_handlers[cmd]))
 637                 ethnl_notify_handlers[cmd](dev, cmd, data);
 638         else
 639                 WARN_ONCE(1, "notification %u not implemented (dev=%s)\n",
 640                           cmd, netdev_name(dev));
 641 }
 642 EXPORT_SYMBOL(ethtool_notify);
 643
 644 static void ethnl_notify_features(struct netdev_notifier_info *info)
 645 {
 646         struct net_device *dev = netdev_notifier_info_to_dev(info);
 647
 648         ethtool_notify(dev, ETHTOOL_MSG_FEATURES_NTF, NULL);
 649 }
 650
 651 static int ethnl_netdev_event(struct notifier_block *this, unsigned long event,
 652                               void *ptr)
 653 {
 654         switch (event) {
 655         case NETDEV_FEAT_CHANGE:
 656                 ethnl_notify_features(ptr);
 657                 break;
 658         }
 659
 660         return NOTIFY_DONE;
 661 }
 662
 663 static struct notifier_block ethnl_netdev_notifier = {
 664         .notifier_call = ethnl_netdev_event,
 665 };
 666
 667 /* genetlink setup */
 668
 669 static const struct genl_ops ethtool_genl_ops[] = {
 670         {
 671                 .cmd    = ETHTOOL_MSG_STRSET_GET,
 672                 .doit   = ethnl_default_doit,
 673                 .start  = ethnl_default_start,
 674                 .dumpit = ethnl_default_dumpit,
 675                 .done   = ethnl_default_done,
 676         },
 677         {
 678                 .cmd    = ETHTOOL_MSG_LINKINFO_GET,
 679                 .doit   = ethnl_default_doit,
 680                 .start  = ethnl_default_start,
 681                 .dumpit = ethnl_default_dumpit,
 682                 .done   = ethnl_default_done,
 683         },
 684         {
 685                 .cmd    = ETHTOOL_MSG_LINKINFO_SET,
 686                 .flags  = GENL_UNS_ADMIN_PERM,
 687                 .doit   = ethnl_set_linkinfo,
 688         },
 689         {
 690                 .cmd    = ETHTOOL_MSG_LINKMODES_GET,
 691                 .doit   = ethnl_default_doit,
 692                 .start  = ethnl_default_start,
 693                 .dumpit = ethnl_default_dumpit,
 694                 .done   = ethnl_default_done,
 695         },
 696         {
 697                 .cmd    = ETHTOOL_MSG_LINKMODES_SET,
 698                 .flags  = GENL_UNS_ADMIN_PERM,
 699                 .doit   = ethnl_set_linkmodes,
 700         },
 701         {
 702                 .cmd    = ETHTOOL_MSG_LINKSTATE_GET,
 703                 .doit   = ethnl_default_doit,
 704                 .start  = ethnl_default_start,
 705                 .dumpit = ethnl_default_dumpit,
 706                 .done   = ethnl_default_done,
 707         },
 708         {
 709                 .cmd    = ETHTOOL_MSG_DEBUG_GET,
 710                 .doit   = ethnl_default_doit,
 711                 .start  = ethnl_default_start,
 712                 .dumpit = ethnl_default_dumpit,
 713                 .done   = ethnl_default_done,
 714         },
 715         {
 716                 .cmd    = ETHTOOL_MSG_DEBUG_SET,
 717                 .flags  = GENL_UNS_ADMIN_PERM,
 718                 .doit   = ethnl_set_debug,
 719         },
 720         {
 721                 .cmd    = ETHTOOL_MSG_WOL_GET,
 722                 .flags  = GENL_UNS_ADMIN_PERM,
 723                 .doit   = ethnl_default_doit,
 724                 .start  = ethnl_default_start,
 725                 .dumpit = ethnl_default_dumpit,
 726                 .done   = ethnl_default_done,
 727         },
 728         {
 729                 .cmd    = ETHTOOL_MSG_WOL_SET,
 730                 .flags  = GENL_UNS_ADMIN_PERM,
 731                 .doit   = ethnl_set_wol,
 732         },
 733         {
 734                 .cmd    = ETHTOOL_MSG_FEATURES_GET,
 735                 .doit   = ethnl_default_doit,
 736                 .start  = ethnl_default_start,
 737                 .dumpit = ethnl_default_dumpit,
 738                 .done   = ethnl_default_done,
 739         },
 740         {
 741                 .cmd    = ETHTOOL_MSG_FEATURES_SET,
 742                 .flags  = GENL_UNS_ADMIN_PERM,
 743                 .doit   = ethnl_set_features,
 744         },
 745         {
 746                 .cmd    = ETHTOOL_MSG_PRIVFLAGS_GET,
 747                 .doit   = ethnl_default_doit,
 748                 .start  = ethnl_default_start,
 749                 .dumpit = ethnl_default_dumpit,
 750                 .done   = ethnl_default_done,
 751         },
 752         {
 753                 .cmd    = ETHTOOL_MSG_PRIVFLAGS_SET,
 754                 .flags  = GENL_UNS_ADMIN_PERM,
 755                 .doit   = ethnl_set_privflags,
 756         },
 757         {
 758                 .cmd    = ETHTOOL_MSG_RINGS_GET,
 759                 .doit   = ethnl_default_doit,
 760                 .start  = ethnl_default_start,
 761                 .dumpit = ethnl_default_dumpit,
 762                 .done   = ethnl_default_done,
 763         },
 764         {
 765                 .cmd    = ETHTOOL_MSG_RINGS_SET,
 766                 .flags  = GENL_UNS_ADMIN_PERM,
 767                 .doit   = ethnl_set_rings,
 768         },
 769         {
 770                 .cmd    = ETHTOOL_MSG_CHANNELS_GET,
 771                 .doit   = ethnl_default_doit,
 772                 .start  = ethnl_default_start,
 773                 .dumpit = ethnl_default_dumpit,
 774                 .done   = ethnl_default_done,
 775         },
 776         {
 777                 .cmd    = ETHTOOL_MSG_CHANNELS_SET,
 778                 .flags  = GENL_UNS_ADMIN_PERM,
 779                 .doit   = ethnl_set_channels,
 780         },
 781 };
 782
 783 static const struct genl_multicast_group ethtool_nl_mcgrps[] = {
 784         [ETHNL_MCGRP_MONITOR] = { .name = ETHTOOL_MCGRP_MONITOR_NAME },
 785 };
 786
 787 static struct genl_family ethtool_genl_family = {
 788         .name           = ETHTOOL_GENL_NAME,
 789         .version        = ETHTOOL_GENL_VERSION,
 790         .netnsok        = true,
 791         .parallel_ops   = true,
 792         .ops            = ethtool_genl_ops,
 793         .n_ops          = ARRAY_SIZE(ethtool_genl_ops),
 794         .mcgrps         = ethtool_nl_mcgrps,
 795         .n_mcgrps       = ARRAY_SIZE(ethtool_nl_mcgrps),
 796 };
 797
 798 /* module setup */
 799
 800 static int __init ethnl_init(void)
 801 {
 802         int ret;
 803
 804         ret = genl_register_family(&ethtool_genl_family);
 805         if (WARN(ret < 0, "ethtool: genetlink family registration failed"))
 806                 return ret;
 807         ethnl_ok = true;
 808
 809         ret = register_netdevice_notifier(&ethnl_netdev_notifier);
 810         WARN(ret < 0, "ethtool: net device notifier registration failed");
 811         return ret;
 812 }
 813
 814 subsys_initcall(ethnl_init);