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