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         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         [ETHTOOL_MSG_FEATURES_GET]      = &ethnl_features_request_ops,
 227         [ETHTOOL_MSG_PRIVFLAGS_GET]     = &ethnl_privflags_request_ops,
 228         [ETHTOOL_MSG_RINGS_GET]         = &ethnl_rings_request_ops,
 229         [ETHTOOL_MSG_CHANNELS_GET]      = &ethnl_channels_request_ops,
 230         [ETHTOOL_MSG_COALESCE_GET]      = &ethnl_coalesce_request_ops,
 231         [ETHTOOL_MSG_PAUSE_GET]         = &ethnl_pause_request_ops,
 232 };
 233
 234 static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
 235 {
 236         return (struct ethnl_dump_ctx *)cb->ctx;
 237 }
 238
 239 /**
 240  * ethnl_default_parse() - Parse request message
 241  * @req_info:    pointer to structure to put data into
 242  * @nlhdr:       pointer to request message header
 243  * @net:         request netns
 244  * @request_ops: struct request_ops for request type
 245  * @extack:      netlink extack for error reporting
 246  * @require_dev: fail if no device identified in header
 247  *
 248  * Parse universal request header and call request specific ->parse_request()
 249  * callback (if defined) to parse the rest of the message.
 250  *
 251  * Return: 0 on success or negative error code
 252  */
 253 static int ethnl_default_parse(struct ethnl_req_info *req_info,
 254                                const struct nlmsghdr *nlhdr, struct net *net,
 255                                const struct ethnl_request_ops *request_ops,
 256                                struct netlink_ext_ack *extack, bool require_dev)
 257 {
 258         struct nlattr **tb;
 259         int ret;
 260
 261         tb = kmalloc_array(request_ops->max_attr + 1, sizeof(tb[0]),
 262                            GFP_KERNEL);
 263         if (!tb)
 264                 return -ENOMEM;
 265
 266         ret = nlmsg_parse(nlhdr, GENL_HDRLEN, tb, request_ops->max_attr,
 267                           request_ops->request_policy, extack);
 268         if (ret < 0)
 269                 goto out;
 270         ret = ethnl_parse_header_dev_get(req_info, tb[request_ops->hdr_attr],
 271                                          net, extack, require_dev);
 272         if (ret < 0)
 273                 goto out;
 274
 275         if (request_ops->parse_request) {
 276                 ret = request_ops->parse_request(req_info, tb, extack);
 277                 if (ret < 0)
 278                         goto out;
 279         }
 280
 281         ret = 0;
 282 out:
 283         kfree(tb);
 284         return ret;
 285 }
 286
 287 /**
 288  * ethnl_init_reply_data() - Initialize reply data for GET request
 289  * @reply_data: pointer to embedded struct ethnl_reply_data
 290  * @ops:        instance of struct ethnl_request_ops describing the layout
 291  * @dev:        network device to initialize the reply for
 292  *
 293  * Fills the reply data part with zeros and sets the dev member. Must be called
 294  * before calling the ->fill_reply() callback (for each iteration when handling
 295  * dump requests).
 296  */
 297 static void ethnl_init_reply_data(struct ethnl_reply_data *reply_data,
 298                                   const struct ethnl_request_ops *ops,
 299                                   struct net_device *dev)
 300 {
 301         memset(reply_data, 0, ops->reply_data_size);
 302         reply_data->dev = dev;
 303 }
 304
 305 /* default ->doit() handler for GET type requests */
 306 static int ethnl_default_doit(struct sk_buff *skb, struct genl_info *info)
 307 {
 308         struct ethnl_reply_data *reply_data = NULL;
 309         struct ethnl_req_info *req_info = NULL;
 310         const u8 cmd = info->genlhdr->cmd;
 311         const struct ethnl_request_ops *ops;
 312         struct sk_buff *rskb;
 313         void *reply_payload;
 314         int reply_len;
 315         int ret;
 316
 317         ops = ethnl_default_requests[cmd];
 318         if (WARN_ONCE(!ops, "cmd %u has no ethnl_request_ops\n", cmd))
 319                 return -EOPNOTSUPP;
 320         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 321         if (!req_info)
 322                 return -ENOMEM;
 323         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 324         if (!reply_data) {
 325                 kfree(req_info);
 326                 return -ENOMEM;
 327         }
 328
 329         ret = ethnl_default_parse(req_info, info->nlhdr, genl_info_net(info), ops,
 330                                   info->extack, !ops->allow_nodev_do);
 331         if (ret < 0)
 332                 goto err_dev;
 333         ethnl_init_reply_data(reply_data, ops, req_info->dev);
 334
 335         rtnl_lock();
 336         ret = ops->prepare_data(req_info, reply_data, info);
 337         rtnl_unlock();
 338         if (ret < 0)
 339                 goto err_cleanup;
 340         ret = ops->reply_size(req_info, reply_data);
 341         if (ret < 0)
 342                 goto err_cleanup;
 343         reply_len = ret;
 344         ret = -ENOMEM;
 345         rskb = ethnl_reply_init(reply_len, req_info->dev, ops->reply_cmd,
 346                                 ops->hdr_attr, info, &reply_payload);
 347         if (!rskb)
 348                 goto err_cleanup;
 349         ret = ops->fill_reply(rskb, req_info, reply_data);
 350         if (ret < 0)
 351                 goto err_msg;
 352         if (ops->cleanup_data)
 353                 ops->cleanup_data(reply_data);
 354
 355         genlmsg_end(rskb, reply_payload);
 356         if (req_info->dev)
 357                 dev_put(req_info->dev);
 358         kfree(reply_data);
 359         kfree(req_info);
 360         return genlmsg_reply(rskb, info);
 361
 362 err_msg:
 363         WARN_ONCE(ret == -EMSGSIZE, "calculated message payload length (%d) not sufficient\n", reply_len);
 364         nlmsg_free(rskb);
 365 err_cleanup:
 366         if (ops->cleanup_data)
 367                 ops->cleanup_data(reply_data);
 368 err_dev:
 369         if (req_info->dev)
 370                 dev_put(req_info->dev);
 371         kfree(reply_data);
 372         kfree(req_info);
 373         return ret;
 374 }
 375
 376 static int ethnl_default_dump_one(struct sk_buff *skb, struct net_device *dev,
 377                                   const struct ethnl_dump_ctx *ctx)
 378 {
 379         int ret;
 380
 381         ethnl_init_reply_data(ctx->reply_data, ctx->ops, dev);
 382         rtnl_lock();
 383         ret = ctx->ops->prepare_data(ctx->req_info, ctx->reply_data, NULL);
 384         rtnl_unlock();
 385         if (ret < 0)
 386                 goto out;
 387         ret = ethnl_fill_reply_header(skb, dev, ctx->ops->hdr_attr);
 388         if (ret < 0)
 389                 goto out;
 390         ret = ctx->ops->fill_reply(skb, ctx->req_info, ctx->reply_data);
 391
 392 out:
 393         if (ctx->ops->cleanup_data)
 394                 ctx->ops->cleanup_data(ctx->reply_data);
 395         ctx->reply_data->dev = NULL;
 396         return ret;
 397 }
 398
 399 /* Default ->dumpit() handler for GET requests. Device iteration copied from
 400  * rtnl_dump_ifinfo(); we have to be more careful about device hashtable
 401  * persistence as we cannot guarantee to hold RTNL lock through the whole
 402  * function as rtnetnlink does.
 403  */
 404 static int ethnl_default_dumpit(struct sk_buff *skb,
 405                                 struct netlink_callback *cb)
 406 {
 407         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 408         struct net *net = sock_net(skb->sk);
 409         int s_idx = ctx->pos_idx;
 410         int h, idx = 0;
 411         int ret = 0;
 412         void *ehdr;
 413
 414         rtnl_lock();
 415         for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 416                 struct hlist_head *head;
 417                 struct net_device *dev;
 418                 unsigned int seq;
 419
 420                 head = &net->dev_index_head[h];
 421
 422 restart_chain:
 423                 seq = net->dev_base_seq;
 424                 cb->seq = seq;
 425                 idx = 0;
 426                 hlist_for_each_entry(dev, head, index_hlist) {
 427                         if (idx < s_idx)
 428                                 goto cont;
 429                         dev_hold(dev);
 430                         rtnl_unlock();
 431
 432                         ehdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
 433                                            cb->nlh->nlmsg_seq,
 434                                            &ethtool_genl_family, 0,
 435                                            ctx->ops->reply_cmd);
 436                         if (!ehdr) {
 437                                 dev_put(dev);
 438                                 ret = -EMSGSIZE;
 439                                 goto out;
 440                         }
 441                         ret = ethnl_default_dump_one(skb, dev, ctx);
 442                         dev_put(dev);
 443                         if (ret < 0) {
 444                                 genlmsg_cancel(skb, ehdr);
 445                                 if (ret == -EOPNOTSUPP)
 446                                         goto lock_and_cont;
 447                                 if (likely(skb->len))
 448                                         ret = skb->len;
 449                                 goto out;
 450                         }
 451                         genlmsg_end(skb, ehdr);
 452 lock_and_cont:
 453                         rtnl_lock();
 454                         if (net->dev_base_seq != seq) {
 455                                 s_idx = idx + 1;
 456                                 goto restart_chain;
 457                         }
 458 cont:
 459                         idx++;
 460                 }
 461
 462         }
 463         rtnl_unlock();
 464
 465 out:
 466         ctx->pos_hash = h;
 467         ctx->pos_idx = idx;
 468         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 469
 470         return ret;
 471 }
 472
 473 /* generic ->start() handler for GET requests */
 474 static int ethnl_default_start(struct netlink_callback *cb)
 475 {
 476         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 477         struct ethnl_reply_data *reply_data;
 478         const struct ethnl_request_ops *ops;
 479         struct ethnl_req_info *req_info;
 480         struct genlmsghdr *ghdr;
 481         int ret;
 482
 483         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
 484
 485         ghdr = nlmsg_data(cb->nlh);
 486         ops = ethnl_default_requests[ghdr->cmd];
 487         if (WARN_ONCE(!ops, "cmd %u has no ethnl_request_ops\n", ghdr->cmd))
 488                 return -EOPNOTSUPP;
 489         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 490         if (!req_info)
 491                 return -ENOMEM;
 492         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 493         if (!reply_data) {
 494                 ret = -ENOMEM;
 495                 goto free_req_info;
 496         }
 497
 498         ret = ethnl_default_parse(req_info, cb->nlh, sock_net(cb->skb->sk), ops,
 499                                   cb->extack, false);
 500         if (req_info->dev) {
 501                 /* We ignore device specification in dump requests but as the
 502                  * same parser as for non-dump (doit) requests is used, it
 503                  * would take reference to the device if it finds one
 504                  */
 505                 dev_put(req_info->dev);
 506                 req_info->dev = NULL;
 507         }
 508         if (ret < 0)
 509                 goto free_reply_data;
 510
 511         ctx->ops = ops;
 512         ctx->req_info = req_info;
 513         ctx->reply_data = reply_data;
 514         ctx->pos_hash = 0;
 515         ctx->pos_idx = 0;
 516
 517         return 0;
 518
 519 free_reply_data:
 520         kfree(reply_data);
 521 free_req_info:
 522         kfree(req_info);
 523
 524         return ret;
 525 }
 526
 527 /* default ->done() handler for GET requests */
 528 static int ethnl_default_done(struct netlink_callback *cb)
 529 {
 530         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 531
 532         kfree(ctx->reply_data);
 533         kfree(ctx->req_info);
 534
 535         return 0;
 536 }
 537
 538 static const struct ethnl_request_ops *
 539 ethnl_default_notify_ops[ETHTOOL_MSG_KERNEL_MAX + 1] = {
 540         [ETHTOOL_MSG_LINKINFO_NTF]      = &ethnl_linkinfo_request_ops,
 541         [ETHTOOL_MSG_LINKMODES_NTF]     = &ethnl_linkmodes_request_ops,
 542         [ETHTOOL_MSG_DEBUG_NTF]         = &ethnl_debug_request_ops,
 543         [ETHTOOL_MSG_WOL_NTF]           = &ethnl_wol_request_ops,
 544         [ETHTOOL_MSG_FEATURES_NTF]      = &ethnl_features_request_ops,
 545         [ETHTOOL_MSG_PRIVFLAGS_NTF]     = &ethnl_privflags_request_ops,
 546         [ETHTOOL_MSG_RINGS_NTF]         = &ethnl_rings_request_ops,
 547         [ETHTOOL_MSG_CHANNELS_NTF]      = &ethnl_channels_request_ops,
 548         [ETHTOOL_MSG_COALESCE_NTF]      = &ethnl_coalesce_request_ops,
 549 };
 550
 551 /* default notification handler */
 552 static void ethnl_default_notify(struct net_device *dev, unsigned int cmd,
 553                                  const void *data)
 554 {
 555         struct ethnl_reply_data *reply_data;
 556         const struct ethnl_request_ops *ops;
 557         struct ethnl_req_info *req_info;
 558         struct sk_buff *skb;
 559         void *reply_payload;
 560         int reply_len;
 561         int ret;
 562
 563         if (WARN_ONCE(cmd > ETHTOOL_MSG_KERNEL_MAX ||
 564                       !ethnl_default_notify_ops[cmd],
 565                       "unexpected notification type %u\n", cmd))
 566                 return;
 567         ops = ethnl_default_notify_ops[cmd];
 568         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 569         if (!req_info)
 570                 return;
 571         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 572         if (!reply_data) {
 573                 kfree(req_info);
 574                 return;
 575         }
 576
 577         req_info->dev = dev;
 578         req_info->flags |= ETHTOOL_FLAG_COMPACT_BITSETS;
 579
 580         ethnl_init_reply_data(reply_data, ops, dev);
 581         ret = ops->prepare_data(req_info, reply_data, NULL);
 582         if (ret < 0)
 583                 goto err_cleanup;
 584         ret = ops->reply_size(req_info, reply_data);
 585         if (ret < 0)
 586                 goto err_cleanup;
 587         reply_len = ret;
 588         ret = -ENOMEM;
 589         skb = genlmsg_new(reply_len, GFP_KERNEL);
 590         if (!skb)
 591                 goto err_cleanup;
 592         reply_payload = ethnl_bcastmsg_put(skb, cmd);
 593         if (!reply_payload)
 594                 goto err_skb;
 595         ret = ethnl_fill_reply_header(skb, dev, ops->hdr_attr);
 596         if (ret < 0)
 597                 goto err_msg;
 598         ret = ops->fill_reply(skb, req_info, reply_data);
 599         if (ret < 0)
 600                 goto err_msg;
 601         if (ops->cleanup_data)
 602                 ops->cleanup_data(reply_data);
 603
 604         genlmsg_end(skb, reply_payload);
 605         kfree(reply_data);
 606         kfree(req_info);
 607         ethnl_multicast(skb, dev);
 608         return;
 609
 610 err_msg:
 611         WARN_ONCE(ret == -EMSGSIZE,
 612                   "calculated message payload length (%d) not sufficient\n",
 613                   reply_len);
 614 err_skb:
 615         nlmsg_free(skb);
 616 err_cleanup:
 617         if (ops->cleanup_data)
 618                 ops->cleanup_data(reply_data);
 619         kfree(reply_data);
 620         kfree(req_info);
 621         return;
 622 }
 623
 624 /* notifications */
 625
 626 typedef void (*ethnl_notify_handler_t)(struct net_device *dev, unsigned int cmd,
 627                                        const void *data);
 628
 629 static const ethnl_notify_handler_t ethnl_notify_handlers[] = {
 630         [ETHTOOL_MSG_LINKINFO_NTF]      = ethnl_default_notify,
 631         [ETHTOOL_MSG_LINKMODES_NTF]     = ethnl_default_notify,
 632         [ETHTOOL_MSG_DEBUG_NTF]         = ethnl_default_notify,
 633         [ETHTOOL_MSG_WOL_NTF]           = ethnl_default_notify,
 634         [ETHTOOL_MSG_FEATURES_NTF]      = ethnl_default_notify,
 635         [ETHTOOL_MSG_PRIVFLAGS_NTF]     = ethnl_default_notify,
 636         [ETHTOOL_MSG_RINGS_NTF]         = ethnl_default_notify,
 637         [ETHTOOL_MSG_CHANNELS_NTF]      = ethnl_default_notify,
 638         [ETHTOOL_MSG_COALESCE_NTF]      = ethnl_default_notify,
 639 };
 640
 641 void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data)
 642 {
 643         if (unlikely(!ethnl_ok))
 644                 return;
 645         ASSERT_RTNL();
 646
 647         if (likely(cmd < ARRAY_SIZE(ethnl_notify_handlers) &&
 648                    ethnl_notify_handlers[cmd]))
 649                 ethnl_notify_handlers[cmd](dev, cmd, data);
 650         else
 651                 WARN_ONCE(1, "notification %u not implemented (dev=%s)\n",
 652                           cmd, netdev_name(dev));
 653 }
 654 EXPORT_SYMBOL(ethtool_notify);
 655
 656 static void ethnl_notify_features(struct netdev_notifier_info *info)
 657 {
 658         struct net_device *dev = netdev_notifier_info_to_dev(info);
 659
 660         ethtool_notify(dev, ETHTOOL_MSG_FEATURES_NTF, NULL);
 661 }
 662
 663 static int ethnl_netdev_event(struct notifier_block *this, unsigned long event,
 664                               void *ptr)
 665 {
 666         switch (event) {
 667         case NETDEV_FEAT_CHANGE:
 668                 ethnl_notify_features(ptr);
 669                 break;
 670         }
 671
 672         return NOTIFY_DONE;
 673 }
 674
 675 static struct notifier_block ethnl_netdev_notifier = {
 676         .notifier_call = ethnl_netdev_event,
 677 };
 678
 679 /* genetlink setup */
 680
 681 static const struct genl_ops ethtool_genl_ops[] = {
 682         {
 683                 .cmd    = ETHTOOL_MSG_STRSET_GET,
 684                 .doit   = ethnl_default_doit,
 685                 .start  = ethnl_default_start,
 686                 .dumpit = ethnl_default_dumpit,
 687                 .done   = ethnl_default_done,
 688         },
 689         {
 690                 .cmd    = ETHTOOL_MSG_LINKINFO_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_LINKINFO_SET,
 698                 .flags  = GENL_UNS_ADMIN_PERM,
 699                 .doit   = ethnl_set_linkinfo,
 700         },
 701         {
 702                 .cmd    = ETHTOOL_MSG_LINKMODES_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_LINKMODES_SET,
 710                 .flags  = GENL_UNS_ADMIN_PERM,
 711                 .doit   = ethnl_set_linkmodes,
 712         },
 713         {
 714                 .cmd    = ETHTOOL_MSG_LINKSTATE_GET,
 715                 .doit   = ethnl_default_doit,
 716                 .start  = ethnl_default_start,
 717                 .dumpit = ethnl_default_dumpit,
 718                 .done   = ethnl_default_done,
 719         },
 720         {
 721                 .cmd    = ETHTOOL_MSG_DEBUG_GET,
 722                 .doit   = ethnl_default_doit,
 723                 .start  = ethnl_default_start,
 724                 .dumpit = ethnl_default_dumpit,
 725                 .done   = ethnl_default_done,
 726         },
 727         {
 728                 .cmd    = ETHTOOL_MSG_DEBUG_SET,
 729                 .flags  = GENL_UNS_ADMIN_PERM,
 730                 .doit   = ethnl_set_debug,
 731         },
 732         {
 733                 .cmd    = ETHTOOL_MSG_WOL_GET,
 734                 .flags  = GENL_UNS_ADMIN_PERM,
 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_WOL_SET,
 742                 .flags  = GENL_UNS_ADMIN_PERM,
 743                 .doit   = ethnl_set_wol,
 744         },
 745         {
 746                 .cmd    = ETHTOOL_MSG_FEATURES_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_FEATURES_SET,
 754                 .flags  = GENL_UNS_ADMIN_PERM,
 755                 .doit   = ethnl_set_features,
 756         },
 757         {
 758                 .cmd    = ETHTOOL_MSG_PRIVFLAGS_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_PRIVFLAGS_SET,
 766                 .flags  = GENL_UNS_ADMIN_PERM,
 767                 .doit   = ethnl_set_privflags,
 768         },
 769         {
 770                 .cmd    = ETHTOOL_MSG_RINGS_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_RINGS_SET,
 778                 .flags  = GENL_UNS_ADMIN_PERM,
 779                 .doit   = ethnl_set_rings,
 780         },
 781         {
 782                 .cmd    = ETHTOOL_MSG_CHANNELS_GET,
 783                 .doit   = ethnl_default_doit,
 784                 .start  = ethnl_default_start,
 785                 .dumpit = ethnl_default_dumpit,
 786                 .done   = ethnl_default_done,
 787         },
 788         {
 789                 .cmd    = ETHTOOL_MSG_CHANNELS_SET,
 790                 .flags  = GENL_UNS_ADMIN_PERM,
 791                 .doit   = ethnl_set_channels,
 792         },
 793         {
 794                 .cmd    = ETHTOOL_MSG_COALESCE_GET,
 795                 .doit   = ethnl_default_doit,
 796                 .start  = ethnl_default_start,
 797                 .dumpit = ethnl_default_dumpit,
 798                 .done   = ethnl_default_done,
 799         },
 800         {
 801                 .cmd    = ETHTOOL_MSG_COALESCE_SET,
 802                 .flags  = GENL_UNS_ADMIN_PERM,
 803                 .doit   = ethnl_set_coalesce,
 804         },
 805         {
 806                 .cmd    = ETHTOOL_MSG_PAUSE_GET,
 807                 .doit   = ethnl_default_doit,
 808                 .start  = ethnl_default_start,
 809                 .dumpit = ethnl_default_dumpit,
 810                 .done   = ethnl_default_done,
 811         },
 812         {
 813                 .cmd    = ETHTOOL_MSG_PAUSE_SET,
 814                 .flags  = GENL_UNS_ADMIN_PERM,
 815                 .doit   = ethnl_set_pause,
 816         },
 817 };
 818
 819 static const struct genl_multicast_group ethtool_nl_mcgrps[] = {
 820         [ETHNL_MCGRP_MONITOR] = { .name = ETHTOOL_MCGRP_MONITOR_NAME },
 821 };
 822
 823 static struct genl_family ethtool_genl_family = {
 824         .name           = ETHTOOL_GENL_NAME,
 825         .version        = ETHTOOL_GENL_VERSION,
 826         .netnsok        = true,
 827         .parallel_ops   = true,
 828         .ops            = ethtool_genl_ops,
 829         .n_ops          = ARRAY_SIZE(ethtool_genl_ops),
 830         .mcgrps         = ethtool_nl_mcgrps,
 831         .n_mcgrps       = ARRAY_SIZE(ethtool_nl_mcgrps),
 832 };
 833
 834 /* module setup */
 835
 836 static int __init ethnl_init(void)
 837 {
 838         int ret;
 839
 840         ret = genl_register_family(&ethtool_genl_family);
 841         if (WARN(ret < 0, "ethtool: genetlink family registration failed"))
 842                 return ret;
 843         ethnl_ok = true;
 844
 845         ret = register_netdevice_notifier(&ethnl_netdev_notifier);
 846         WARN(ret < 0, "ethtool: net device notifier registration failed");
 847         return ret;
 848 }
 849
 850 subsys_initcall(ethnl_init);