1 // SPDX-License-Identifier: GPL-2.0-only
2 
3 #include <net/sock.h>
4 #include <linux/ethtool_netlink.h>
5 #include <linux/pm_runtime.h>
6 #include "netlink.h"
7 
8 static struct genl_family ethtool_genl_family;
9 
10 static bool ethnl_ok __read_mostly;
11 static u32 ethnl_bcast_seq;
12 
13 #define ETHTOOL_FLAGS_BASIC (ETHTOOL_FLAG_COMPACT_BITSETS |	\
14 			     ETHTOOL_FLAG_OMIT_REPLY)
15 #define ETHTOOL_FLAGS_STATS (ETHTOOL_FLAGS_BASIC | ETHTOOL_FLAG_STATS)
16 
17 const struct nla_policy ethnl_header_policy[] = {
18 	[ETHTOOL_A_HEADER_DEV_INDEX]	= { .type = NLA_U32 },
19 	[ETHTOOL_A_HEADER_DEV_NAME]	= { .type = NLA_NUL_STRING,
20 					    .len = ALTIFNAMSIZ - 1 },
21 	[ETHTOOL_A_HEADER_FLAGS]	= NLA_POLICY_MASK(NLA_U32,
22 							  ETHTOOL_FLAGS_BASIC),
23 };
24 
25 const struct nla_policy ethnl_header_policy_stats[] = {
26 	[ETHTOOL_A_HEADER_DEV_INDEX]	= { .type = NLA_U32 },
27 	[ETHTOOL_A_HEADER_DEV_NAME]	= { .type = NLA_NUL_STRING,
28 					    .len = ALTIFNAMSIZ - 1 },
29 	[ETHTOOL_A_HEADER_FLAGS]	= NLA_POLICY_MASK(NLA_U32,
30 							  ETHTOOL_FLAGS_STATS),
31 };
32 
ethnl_ops_begin(struct net_device * dev)33 int ethnl_ops_begin(struct net_device *dev)
34 {
35 	int ret;
36 
37 	if (!dev)
38 		return -ENODEV;
39 
40 	if (dev->dev.parent)
41 		pm_runtime_get_sync(dev->dev.parent);
42 
43 	if (!netif_device_present(dev) ||
44 	    dev->reg_state == NETREG_UNREGISTERING) {
45 		ret = -ENODEV;
46 		goto err;
47 	}
48 
49 	if (dev->ethtool_ops->begin) {
50 		ret = dev->ethtool_ops->begin(dev);
51 		if (ret)
52 			goto err;
53 	}
54 
55 	return 0;
56 err:
57 	if (dev->dev.parent)
58 		pm_runtime_put(dev->dev.parent);
59 
60 	return ret;
61 }
62 
ethnl_ops_complete(struct net_device * dev)63 void ethnl_ops_complete(struct net_device *dev)
64 {
65 	if (dev->ethtool_ops->complete)
66 		dev->ethtool_ops->complete(dev);
67 
68 	if (dev->dev.parent)
69 		pm_runtime_put(dev->dev.parent);
70 }
71 
72 /**
73  * ethnl_parse_header_dev_get() - parse request header
74  * @req_info:    structure to put results into
75  * @header:      nest attribute with request header
76  * @net:         request netns
77  * @extack:      netlink extack for error reporting
78  * @require_dev: fail if no device identified in header
79  *
80  * Parse request header in nested attribute @nest and puts results into
81  * the structure pointed to by @req_info. Extack from @info is used for error
82  * reporting. If req_info->dev is not null on return, reference to it has
83  * been taken. If error is returned, *req_info is null initialized and no
84  * reference is held.
85  *
86  * Return: 0 on success or negative error code
87  */
ethnl_parse_header_dev_get(struct ethnl_req_info * req_info,const struct nlattr * header,struct net * net,struct netlink_ext_ack * extack,bool require_dev)88 int ethnl_parse_header_dev_get(struct ethnl_req_info *req_info,
89 			       const struct nlattr *header, struct net *net,
90 			       struct netlink_ext_ack *extack, bool require_dev)
91 {
92 	struct nlattr *tb[ARRAY_SIZE(ethnl_header_policy)];
93 	const struct nlattr *devname_attr;
94 	struct net_device *dev = NULL;
95 	u32 flags = 0;
96 	int ret;
97 
98 	if (!header) {
99 		NL_SET_ERR_MSG(extack, "request header missing");
100 		return -EINVAL;
101 	}
102 	/* No validation here, command policy should have a nested policy set
103 	 * for the header, therefore validation should have already been done.
104 	 */
105 	ret = nla_parse_nested(tb, ARRAY_SIZE(ethnl_header_policy) - 1, header,
106 			       NULL, extack);
107 	if (ret < 0)
108 		return ret;
109 	if (tb[ETHTOOL_A_HEADER_FLAGS])
110 		flags = nla_get_u32(tb[ETHTOOL_A_HEADER_FLAGS]);
111 
112 	devname_attr = tb[ETHTOOL_A_HEADER_DEV_NAME];
113 	if (tb[ETHTOOL_A_HEADER_DEV_INDEX]) {
114 		u32 ifindex = nla_get_u32(tb[ETHTOOL_A_HEADER_DEV_INDEX]);
115 
116 		dev = dev_get_by_index(net, ifindex);
117 		if (!dev) {
118 			NL_SET_ERR_MSG_ATTR(extack,
119 					    tb[ETHTOOL_A_HEADER_DEV_INDEX],
120 					    "no device matches ifindex");
121 			return -ENODEV;
122 		}
123 		/* if both ifindex and ifname are passed, they must match */
124 		if (devname_attr &&
125 		    strncmp(dev->name, nla_data(devname_attr), IFNAMSIZ)) {
126 			dev_put(dev);
127 			NL_SET_ERR_MSG_ATTR(extack, header,
128 					    "ifindex and name do not match");
129 			return -ENODEV;
130 		}
131 	} else if (devname_attr) {
132 		dev = dev_get_by_name(net, nla_data(devname_attr));
133 		if (!dev) {
134 			NL_SET_ERR_MSG_ATTR(extack, devname_attr,
135 					    "no device matches name");
136 			return -ENODEV;
137 		}
138 	} else if (require_dev) {
139 		NL_SET_ERR_MSG_ATTR(extack, header,
140 				    "neither ifindex nor name specified");
141 		return -EINVAL;
142 	}
143 
144 	req_info->dev = dev;
145 	if (dev)
146 		netdev_tracker_alloc(dev, &req_info->dev_tracker, GFP_KERNEL);
147 	req_info->flags = flags;
148 	return 0;
149 }
150 
151 /**
152  * ethnl_fill_reply_header() - Put common header into a reply message
153  * @skb:      skb with the message
154  * @dev:      network device to describe in header
155  * @attrtype: attribute type to use for the nest
156  *
157  * Create a nested attribute with attributes describing given network device.
158  *
159  * Return: 0 on success, error value (-EMSGSIZE only) on error
160  */
ethnl_fill_reply_header(struct sk_buff * skb,struct net_device * dev,u16 attrtype)161 int ethnl_fill_reply_header(struct sk_buff *skb, struct net_device *dev,
162 			    u16 attrtype)
163 {
164 	struct nlattr *nest;
165 
166 	if (!dev)
167 		return 0;
168 	nest = nla_nest_start(skb, attrtype);
169 	if (!nest)
170 		return -EMSGSIZE;
171 
172 	if (nla_put_u32(skb, ETHTOOL_A_HEADER_DEV_INDEX, (u32)dev->ifindex) ||
173 	    nla_put_string(skb, ETHTOOL_A_HEADER_DEV_NAME, dev->name))
174 		goto nla_put_failure;
175 	/* If more attributes are put into reply header, ethnl_header_size()
176 	 * must be updated to account for them.
177 	 */
178 
179 	nla_nest_end(skb, nest);
180 	return 0;
181 
182 nla_put_failure:
183 	nla_nest_cancel(skb, nest);
184 	return -EMSGSIZE;
185 }
186 
187 /**
188  * ethnl_reply_init() - Create skb for a reply and fill device identification
189  * @payload:      payload length (without netlink and genetlink header)
190  * @dev:          device the reply is about (may be null)
191  * @cmd:          ETHTOOL_MSG_* message type for reply
192  * @hdr_attrtype: attribute type for common header
193  * @info:         genetlink info of the received packet we respond to
194  * @ehdrp:        place to store payload pointer returned by genlmsg_new()
195  *
196  * Return: pointer to allocated skb on success, NULL on error
197  */
ethnl_reply_init(size_t payload,struct net_device * dev,u8 cmd,u16 hdr_attrtype,struct genl_info * info,void ** ehdrp)198 struct sk_buff *ethnl_reply_init(size_t payload, struct net_device *dev, u8 cmd,
199 				 u16 hdr_attrtype, struct genl_info *info,
200 				 void **ehdrp)
201 {
202 	struct sk_buff *skb;
203 
204 	skb = genlmsg_new(payload, GFP_KERNEL);
205 	if (!skb)
206 		goto err;
207 	*ehdrp = genlmsg_put_reply(skb, info, &ethtool_genl_family, 0, cmd);
208 	if (!*ehdrp)
209 		goto err_free;
210 
211 	if (dev) {
212 		int ret;
213 
214 		ret = ethnl_fill_reply_header(skb, dev, hdr_attrtype);
215 		if (ret < 0)
216 			goto err_free;
217 	}
218 	return skb;
219 
220 err_free:
221 	nlmsg_free(skb);
222 err:
223 	if (info)
224 		GENL_SET_ERR_MSG(info, "failed to setup reply message");
225 	return NULL;
226 }
227 
ethnl_dump_put(struct sk_buff * skb,struct netlink_callback * cb,u8 cmd)228 void *ethnl_dump_put(struct sk_buff *skb, struct netlink_callback *cb, u8 cmd)
229 {
230 	return genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
231 			   &ethtool_genl_family, 0, cmd);
232 }
233 
ethnl_bcastmsg_put(struct sk_buff * skb,u8 cmd)234 void *ethnl_bcastmsg_put(struct sk_buff *skb, u8 cmd)
235 {
236 	return genlmsg_put(skb, 0, ++ethnl_bcast_seq, &ethtool_genl_family, 0,
237 			   cmd);
238 }
239 
ethnl_multicast(struct sk_buff * skb,struct net_device * dev)240 int ethnl_multicast(struct sk_buff *skb, struct net_device *dev)
241 {
242 	return genlmsg_multicast_netns(&ethtool_genl_family, dev_net(dev), skb,
243 				       0, ETHNL_MCGRP_MONITOR, GFP_KERNEL);
244 }
245 
246 /* GET request helpers */
247 
248 /**
249  * struct ethnl_dump_ctx - context structure for generic dumpit() callback
250  * @ops:        request ops of currently processed message type
251  * @req_info:   parsed request header of processed request
252  * @reply_data: data needed to compose the reply
253  * @pos_hash:   saved iteration position - hashbucket
254  * @pos_idx:    saved iteration position - index
255  *
256  * These parameters are kept in struct netlink_callback as context preserved
257  * between iterations. They are initialized by ethnl_default_start() and used
258  * in ethnl_default_dumpit() and ethnl_default_done().
259  */
260 struct ethnl_dump_ctx {
261 	const struct ethnl_request_ops	*ops;
262 	struct ethnl_req_info		*req_info;
263 	struct ethnl_reply_data		*reply_data;
264 	int				pos_hash;
265 	int				pos_idx;
266 };
267 
268 static const struct ethnl_request_ops *
269 ethnl_default_requests[__ETHTOOL_MSG_USER_CNT] = {
270 	[ETHTOOL_MSG_STRSET_GET]	= &ethnl_strset_request_ops,
271 	[ETHTOOL_MSG_LINKINFO_GET]	= &ethnl_linkinfo_request_ops,
272 	[ETHTOOL_MSG_LINKMODES_GET]	= &ethnl_linkmodes_request_ops,
273 	[ETHTOOL_MSG_LINKSTATE_GET]	= &ethnl_linkstate_request_ops,
274 	[ETHTOOL_MSG_DEBUG_GET]		= &ethnl_debug_request_ops,
275 	[ETHTOOL_MSG_WOL_GET]		= &ethnl_wol_request_ops,
276 	[ETHTOOL_MSG_FEATURES_GET]	= &ethnl_features_request_ops,
277 	[ETHTOOL_MSG_PRIVFLAGS_GET]	= &ethnl_privflags_request_ops,
278 	[ETHTOOL_MSG_RINGS_GET]		= &ethnl_rings_request_ops,
279 	[ETHTOOL_MSG_CHANNELS_GET]	= &ethnl_channels_request_ops,
280 	[ETHTOOL_MSG_COALESCE_GET]	= &ethnl_coalesce_request_ops,
281 	[ETHTOOL_MSG_PAUSE_GET]		= &ethnl_pause_request_ops,
282 	[ETHTOOL_MSG_EEE_GET]		= &ethnl_eee_request_ops,
283 	[ETHTOOL_MSG_FEC_GET]		= &ethnl_fec_request_ops,
284 	[ETHTOOL_MSG_TSINFO_GET]	= &ethnl_tsinfo_request_ops,
285 	[ETHTOOL_MSG_MODULE_EEPROM_GET]	= &ethnl_module_eeprom_request_ops,
286 	[ETHTOOL_MSG_STATS_GET]		= &ethnl_stats_request_ops,
287 	[ETHTOOL_MSG_PHC_VCLOCKS_GET]	= &ethnl_phc_vclocks_request_ops,
288 	[ETHTOOL_MSG_MODULE_GET]	= &ethnl_module_request_ops,
289 	[ETHTOOL_MSG_PSE_GET]		= &ethnl_pse_request_ops,
290 };
291 
ethnl_dump_context(struct netlink_callback * cb)292 static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
293 {
294 	return (struct ethnl_dump_ctx *)cb->ctx;
295 }
296 
297 /**
298  * ethnl_default_parse() - Parse request message
299  * @req_info:    pointer to structure to put data into
300  * @tb:		 parsed attributes
301  * @net:         request netns
302  * @request_ops: struct request_ops for request type
303  * @extack:      netlink extack for error reporting
304  * @require_dev: fail if no device identified in header
305  *
306  * Parse universal request header and call request specific ->parse_request()
307  * callback (if defined) to parse the rest of the message.
308  *
309  * Return: 0 on success or negative error code
310  */
ethnl_default_parse(struct ethnl_req_info * req_info,struct nlattr ** tb,struct net * net,const struct ethnl_request_ops * request_ops,struct netlink_ext_ack * extack,bool require_dev)311 static int ethnl_default_parse(struct ethnl_req_info *req_info,
312 			       struct nlattr **tb, struct net *net,
313 			       const struct ethnl_request_ops *request_ops,
314 			       struct netlink_ext_ack *extack, bool require_dev)
315 {
316 	int ret;
317 
318 	ret = ethnl_parse_header_dev_get(req_info, tb[request_ops->hdr_attr],
319 					 net, extack, require_dev);
320 	if (ret < 0)
321 		return ret;
322 
323 	if (request_ops->parse_request) {
324 		ret = request_ops->parse_request(req_info, tb, extack);
325 		if (ret < 0)
326 			return ret;
327 	}
328 
329 	return 0;
330 }
331 
332 /**
333  * ethnl_init_reply_data() - Initialize reply data for GET request
334  * @reply_data: pointer to embedded struct ethnl_reply_data
335  * @ops:        instance of struct ethnl_request_ops describing the layout
336  * @dev:        network device to initialize the reply for
337  *
338  * Fills the reply data part with zeros and sets the dev member. Must be called
339  * before calling the ->fill_reply() callback (for each iteration when handling
340  * dump requests).
341  */
ethnl_init_reply_data(struct ethnl_reply_data * reply_data,const struct ethnl_request_ops * ops,struct net_device * dev)342 static void ethnl_init_reply_data(struct ethnl_reply_data *reply_data,
343 				  const struct ethnl_request_ops *ops,
344 				  struct net_device *dev)
345 {
346 	memset(reply_data, 0, ops->reply_data_size);
347 	reply_data->dev = dev;
348 }
349 
350 /* default ->doit() handler for GET type requests */
ethnl_default_doit(struct sk_buff * skb,struct genl_info * info)351 static int ethnl_default_doit(struct sk_buff *skb, struct genl_info *info)
352 {
353 	struct ethnl_reply_data *reply_data = NULL;
354 	struct ethnl_req_info *req_info = NULL;
355 	const u8 cmd = info->genlhdr->cmd;
356 	const struct ethnl_request_ops *ops;
357 	int hdr_len, reply_len;
358 	struct sk_buff *rskb;
359 	void *reply_payload;
360 	int ret;
361 
362 	ops = ethnl_default_requests[cmd];
363 	if (WARN_ONCE(!ops, "cmd %u has no ethnl_request_ops\n", cmd))
364 		return -EOPNOTSUPP;
365 	if (GENL_REQ_ATTR_CHECK(info, ops->hdr_attr))
366 		return -EINVAL;
367 
368 	req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
369 	if (!req_info)
370 		return -ENOMEM;
371 	reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
372 	if (!reply_data) {
373 		kfree(req_info);
374 		return -ENOMEM;
375 	}
376 
377 	ret = ethnl_default_parse(req_info, info->attrs, genl_info_net(info),
378 				  ops, info->extack, !ops->allow_nodev_do);
379 	if (ret < 0)
380 		goto err_dev;
381 	ethnl_init_reply_data(reply_data, ops, req_info->dev);
382 
383 	rtnl_lock();
384 	ret = ops->prepare_data(req_info, reply_data, info);
385 	rtnl_unlock();
386 	if (ret < 0)
387 		goto err_cleanup;
388 	ret = ops->reply_size(req_info, reply_data);
389 	if (ret < 0)
390 		goto err_cleanup;
391 	reply_len = ret;
392 	ret = -ENOMEM;
393 	rskb = ethnl_reply_init(reply_len + ethnl_reply_header_size(),
394 				req_info->dev, ops->reply_cmd,
395 				ops->hdr_attr, info, &reply_payload);
396 	if (!rskb)
397 		goto err_cleanup;
398 	hdr_len = rskb->len;
399 	ret = ops->fill_reply(rskb, req_info, reply_data);
400 	if (ret < 0)
401 		goto err_msg;
402 	WARN_ONCE(rskb->len - hdr_len > reply_len,
403 		  "ethnl cmd %d: calculated reply length %d, but consumed %d\n",
404 		  cmd, reply_len, rskb->len - hdr_len);
405 	if (ops->cleanup_data)
406 		ops->cleanup_data(reply_data);
407 
408 	genlmsg_end(rskb, reply_payload);
409 	netdev_put(req_info->dev, &req_info->dev_tracker);
410 	kfree(reply_data);
411 	kfree(req_info);
412 	return genlmsg_reply(rskb, info);
413 
414 err_msg:
415 	WARN_ONCE(ret == -EMSGSIZE, "calculated message payload length (%d) not sufficient\n", reply_len);
416 	nlmsg_free(rskb);
417 err_cleanup:
418 	if (ops->cleanup_data)
419 		ops->cleanup_data(reply_data);
420 err_dev:
421 	netdev_put(req_info->dev, &req_info->dev_tracker);
422 	kfree(reply_data);
423 	kfree(req_info);
424 	return ret;
425 }
426 
ethnl_default_dump_one(struct sk_buff * skb,struct net_device * dev,const struct ethnl_dump_ctx * ctx,struct netlink_callback * cb)427 static int ethnl_default_dump_one(struct sk_buff *skb, struct net_device *dev,
428 				  const struct ethnl_dump_ctx *ctx,
429 				  struct netlink_callback *cb)
430 {
431 	void *ehdr;
432 	int ret;
433 
434 	ehdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
435 			   &ethtool_genl_family, NLM_F_MULTI,
436 			   ctx->ops->reply_cmd);
437 	if (!ehdr)
438 		return -EMSGSIZE;
439 
440 	ethnl_init_reply_data(ctx->reply_data, ctx->ops, dev);
441 	rtnl_lock();
442 	ret = ctx->ops->prepare_data(ctx->req_info, ctx->reply_data, NULL);
443 	rtnl_unlock();
444 	if (ret < 0)
445 		goto out;
446 	ret = ethnl_fill_reply_header(skb, dev, ctx->ops->hdr_attr);
447 	if (ret < 0)
448 		goto out;
449 	ret = ctx->ops->fill_reply(skb, ctx->req_info, ctx->reply_data);
450 
451 out:
452 	if (ctx->ops->cleanup_data)
453 		ctx->ops->cleanup_data(ctx->reply_data);
454 	ctx->reply_data->dev = NULL;
455 	if (ret < 0)
456 		genlmsg_cancel(skb, ehdr);
457 	else
458 		genlmsg_end(skb, ehdr);
459 	return ret;
460 }
461 
462 /* Default ->dumpit() handler for GET requests. Device iteration copied from
463  * rtnl_dump_ifinfo(); we have to be more careful about device hashtable
464  * persistence as we cannot guarantee to hold RTNL lock through the whole
465  * function as rtnetnlink does.
466  */
ethnl_default_dumpit(struct sk_buff * skb,struct netlink_callback * cb)467 static int ethnl_default_dumpit(struct sk_buff *skb,
468 				struct netlink_callback *cb)
469 {
470 	struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
471 	struct net *net = sock_net(skb->sk);
472 	int s_idx = ctx->pos_idx;
473 	int h, idx = 0;
474 	int ret = 0;
475 
476 	rtnl_lock();
477 	for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
478 		struct hlist_head *head;
479 		struct net_device *dev;
480 		unsigned int seq;
481 
482 		head = &net->dev_index_head[h];
483 
484 restart_chain:
485 		seq = net->dev_base_seq;
486 		cb->seq = seq;
487 		idx = 0;
488 		hlist_for_each_entry(dev, head, index_hlist) {
489 			if (idx < s_idx)
490 				goto cont;
491 			dev_hold(dev);
492 			rtnl_unlock();
493 
494 			ret = ethnl_default_dump_one(skb, dev, ctx, cb);
495 			dev_put(dev);
496 			if (ret < 0) {
497 				if (ret == -EOPNOTSUPP)
498 					goto lock_and_cont;
499 				if (likely(skb->len))
500 					ret = skb->len;
501 				goto out;
502 			}
503 lock_and_cont:
504 			rtnl_lock();
505 			if (net->dev_base_seq != seq) {
506 				s_idx = idx + 1;
507 				goto restart_chain;
508 			}
509 cont:
510 			idx++;
511 		}
512 
513 	}
514 	rtnl_unlock();
515 
516 out:
517 	ctx->pos_hash = h;
518 	ctx->pos_idx = idx;
519 	nl_dump_check_consistent(cb, nlmsg_hdr(skb));
520 
521 	return ret;
522 }
523 
524 /* generic ->start() handler for GET requests */
ethnl_default_start(struct netlink_callback * cb)525 static int ethnl_default_start(struct netlink_callback *cb)
526 {
527 	const struct genl_dumpit_info *info = genl_dumpit_info(cb);
528 	struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
529 	struct ethnl_reply_data *reply_data;
530 	const struct ethnl_request_ops *ops;
531 	struct ethnl_req_info *req_info;
532 	struct genlmsghdr *ghdr;
533 	int ret;
534 
535 	BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
536 
537 	ghdr = nlmsg_data(cb->nlh);
538 	ops = ethnl_default_requests[ghdr->cmd];
539 	if (WARN_ONCE(!ops, "cmd %u has no ethnl_request_ops\n", ghdr->cmd))
540 		return -EOPNOTSUPP;
541 	req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
542 	if (!req_info)
543 		return -ENOMEM;
544 	reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
545 	if (!reply_data) {
546 		ret = -ENOMEM;
547 		goto free_req_info;
548 	}
549 
550 	ret = ethnl_default_parse(req_info, info->attrs, sock_net(cb->skb->sk),
551 				  ops, cb->extack, false);
552 	if (req_info->dev) {
553 		/* We ignore device specification in dump requests but as the
554 		 * same parser as for non-dump (doit) requests is used, it
555 		 * would take reference to the device if it finds one
556 		 */
557 		netdev_put(req_info->dev, &req_info->dev_tracker);
558 		req_info->dev = NULL;
559 	}
560 	if (ret < 0)
561 		goto free_reply_data;
562 
563 	ctx->ops = ops;
564 	ctx->req_info = req_info;
565 	ctx->reply_data = reply_data;
566 	ctx->pos_hash = 0;
567 	ctx->pos_idx = 0;
568 
569 	return 0;
570 
571 free_reply_data:
572 	kfree(reply_data);
573 free_req_info:
574 	kfree(req_info);
575 
576 	return ret;
577 }
578 
579 /* default ->done() handler for GET requests */
ethnl_default_done(struct netlink_callback * cb)580 static int ethnl_default_done(struct netlink_callback *cb)
581 {
582 	struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
583 
584 	kfree(ctx->reply_data);
585 	kfree(ctx->req_info);
586 
587 	return 0;
588 }
589 
590 static const struct ethnl_request_ops *
591 ethnl_default_notify_ops[ETHTOOL_MSG_KERNEL_MAX + 1] = {
592 	[ETHTOOL_MSG_LINKINFO_NTF]	= &ethnl_linkinfo_request_ops,
593 	[ETHTOOL_MSG_LINKMODES_NTF]	= &ethnl_linkmodes_request_ops,
594 	[ETHTOOL_MSG_DEBUG_NTF]		= &ethnl_debug_request_ops,
595 	[ETHTOOL_MSG_WOL_NTF]		= &ethnl_wol_request_ops,
596 	[ETHTOOL_MSG_FEATURES_NTF]	= &ethnl_features_request_ops,
597 	[ETHTOOL_MSG_PRIVFLAGS_NTF]	= &ethnl_privflags_request_ops,
598 	[ETHTOOL_MSG_RINGS_NTF]		= &ethnl_rings_request_ops,
599 	[ETHTOOL_MSG_CHANNELS_NTF]	= &ethnl_channels_request_ops,
600 	[ETHTOOL_MSG_COALESCE_NTF]	= &ethnl_coalesce_request_ops,
601 	[ETHTOOL_MSG_PAUSE_NTF]		= &ethnl_pause_request_ops,
602 	[ETHTOOL_MSG_EEE_NTF]		= &ethnl_eee_request_ops,
603 	[ETHTOOL_MSG_FEC_NTF]		= &ethnl_fec_request_ops,
604 	[ETHTOOL_MSG_MODULE_NTF]	= &ethnl_module_request_ops,
605 };
606 
607 /* default notification handler */
ethnl_default_notify(struct net_device * dev,unsigned int cmd,const void * data)608 static void ethnl_default_notify(struct net_device *dev, unsigned int cmd,
609 				 const void *data)
610 {
611 	struct ethnl_reply_data *reply_data;
612 	const struct ethnl_request_ops *ops;
613 	struct ethnl_req_info *req_info;
614 	struct sk_buff *skb;
615 	void *reply_payload;
616 	int reply_len;
617 	int ret;
618 
619 	if (WARN_ONCE(cmd > ETHTOOL_MSG_KERNEL_MAX ||
620 		      !ethnl_default_notify_ops[cmd],
621 		      "unexpected notification type %u\n", cmd))
622 		return;
623 	ops = ethnl_default_notify_ops[cmd];
624 	req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
625 	if (!req_info)
626 		return;
627 	reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
628 	if (!reply_data) {
629 		kfree(req_info);
630 		return;
631 	}
632 
633 	req_info->dev = dev;
634 	req_info->flags |= ETHTOOL_FLAG_COMPACT_BITSETS;
635 
636 	ethnl_init_reply_data(reply_data, ops, dev);
637 	ret = ops->prepare_data(req_info, reply_data, NULL);
638 	if (ret < 0)
639 		goto err_cleanup;
640 	ret = ops->reply_size(req_info, reply_data);
641 	if (ret < 0)
642 		goto err_cleanup;
643 	reply_len = ret + ethnl_reply_header_size();
644 	skb = genlmsg_new(reply_len, GFP_KERNEL);
645 	if (!skb)
646 		goto err_cleanup;
647 	reply_payload = ethnl_bcastmsg_put(skb, cmd);
648 	if (!reply_payload)
649 		goto err_skb;
650 	ret = ethnl_fill_reply_header(skb, dev, ops->hdr_attr);
651 	if (ret < 0)
652 		goto err_msg;
653 	ret = ops->fill_reply(skb, req_info, reply_data);
654 	if (ret < 0)
655 		goto err_msg;
656 	if (ops->cleanup_data)
657 		ops->cleanup_data(reply_data);
658 
659 	genlmsg_end(skb, reply_payload);
660 	kfree(reply_data);
661 	kfree(req_info);
662 	ethnl_multicast(skb, dev);
663 	return;
664 
665 err_msg:
666 	WARN_ONCE(ret == -EMSGSIZE,
667 		  "calculated message payload length (%d) not sufficient\n",
668 		  reply_len);
669 err_skb:
670 	nlmsg_free(skb);
671 err_cleanup:
672 	if (ops->cleanup_data)
673 		ops->cleanup_data(reply_data);
674 	kfree(reply_data);
675 	kfree(req_info);
676 	return;
677 }
678 
679 /* notifications */
680 
681 typedef void (*ethnl_notify_handler_t)(struct net_device *dev, unsigned int cmd,
682 				       const void *data);
683 
684 static const ethnl_notify_handler_t ethnl_notify_handlers[] = {
685 	[ETHTOOL_MSG_LINKINFO_NTF]	= ethnl_default_notify,
686 	[ETHTOOL_MSG_LINKMODES_NTF]	= ethnl_default_notify,
687 	[ETHTOOL_MSG_DEBUG_NTF]		= ethnl_default_notify,
688 	[ETHTOOL_MSG_WOL_NTF]		= ethnl_default_notify,
689 	[ETHTOOL_MSG_FEATURES_NTF]	= ethnl_default_notify,
690 	[ETHTOOL_MSG_PRIVFLAGS_NTF]	= ethnl_default_notify,
691 	[ETHTOOL_MSG_RINGS_NTF]		= ethnl_default_notify,
692 	[ETHTOOL_MSG_CHANNELS_NTF]	= ethnl_default_notify,
693 	[ETHTOOL_MSG_COALESCE_NTF]	= ethnl_default_notify,
694 	[ETHTOOL_MSG_PAUSE_NTF]		= ethnl_default_notify,
695 	[ETHTOOL_MSG_EEE_NTF]		= ethnl_default_notify,
696 	[ETHTOOL_MSG_FEC_NTF]		= ethnl_default_notify,
697 	[ETHTOOL_MSG_MODULE_NTF]	= ethnl_default_notify,
698 };
699 
ethtool_notify(struct net_device * dev,unsigned int cmd,const void * data)700 void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data)
701 {
702 	if (unlikely(!ethnl_ok))
703 		return;
704 	ASSERT_RTNL();
705 
706 	if (likely(cmd < ARRAY_SIZE(ethnl_notify_handlers) &&
707 		   ethnl_notify_handlers[cmd]))
708 		ethnl_notify_handlers[cmd](dev, cmd, data);
709 	else
710 		WARN_ONCE(1, "notification %u not implemented (dev=%s)\n",
711 			  cmd, netdev_name(dev));
712 }
713 EXPORT_SYMBOL(ethtool_notify);
714 
ethnl_notify_features(struct netdev_notifier_info * info)715 static void ethnl_notify_features(struct netdev_notifier_info *info)
716 {
717 	struct net_device *dev = netdev_notifier_info_to_dev(info);
718 
719 	ethtool_notify(dev, ETHTOOL_MSG_FEATURES_NTF, NULL);
720 }
721 
ethnl_netdev_event(struct notifier_block * this,unsigned long event,void * ptr)722 static int ethnl_netdev_event(struct notifier_block *this, unsigned long event,
723 			      void *ptr)
724 {
725 	switch (event) {
726 	case NETDEV_FEAT_CHANGE:
727 		ethnl_notify_features(ptr);
728 		break;
729 	}
730 
731 	return NOTIFY_DONE;
732 }
733 
734 static struct notifier_block ethnl_netdev_notifier = {
735 	.notifier_call = ethnl_netdev_event,
736 };
737 
738 /* genetlink setup */
739 
740 static const struct genl_ops ethtool_genl_ops[] = {
741 	{
742 		.cmd	= ETHTOOL_MSG_STRSET_GET,
743 		.doit	= ethnl_default_doit,
744 		.start	= ethnl_default_start,
745 		.dumpit	= ethnl_default_dumpit,
746 		.done	= ethnl_default_done,
747 		.policy = ethnl_strset_get_policy,
748 		.maxattr = ARRAY_SIZE(ethnl_strset_get_policy) - 1,
749 	},
750 	{
751 		.cmd	= ETHTOOL_MSG_LINKINFO_GET,
752 		.doit	= ethnl_default_doit,
753 		.start	= ethnl_default_start,
754 		.dumpit	= ethnl_default_dumpit,
755 		.done	= ethnl_default_done,
756 		.policy = ethnl_linkinfo_get_policy,
757 		.maxattr = ARRAY_SIZE(ethnl_linkinfo_get_policy) - 1,
758 	},
759 	{
760 		.cmd	= ETHTOOL_MSG_LINKINFO_SET,
761 		.flags	= GENL_UNS_ADMIN_PERM,
762 		.doit	= ethnl_set_linkinfo,
763 		.policy = ethnl_linkinfo_set_policy,
764 		.maxattr = ARRAY_SIZE(ethnl_linkinfo_set_policy) - 1,
765 	},
766 	{
767 		.cmd	= ETHTOOL_MSG_LINKMODES_GET,
768 		.doit	= ethnl_default_doit,
769 		.start	= ethnl_default_start,
770 		.dumpit	= ethnl_default_dumpit,
771 		.done	= ethnl_default_done,
772 		.policy = ethnl_linkmodes_get_policy,
773 		.maxattr = ARRAY_SIZE(ethnl_linkmodes_get_policy) - 1,
774 	},
775 	{
776 		.cmd	= ETHTOOL_MSG_LINKMODES_SET,
777 		.flags	= GENL_UNS_ADMIN_PERM,
778 		.doit	= ethnl_set_linkmodes,
779 		.policy = ethnl_linkmodes_set_policy,
780 		.maxattr = ARRAY_SIZE(ethnl_linkmodes_set_policy) - 1,
781 	},
782 	{
783 		.cmd	= ETHTOOL_MSG_LINKSTATE_GET,
784 		.doit	= ethnl_default_doit,
785 		.start	= ethnl_default_start,
786 		.dumpit	= ethnl_default_dumpit,
787 		.done	= ethnl_default_done,
788 		.policy = ethnl_linkstate_get_policy,
789 		.maxattr = ARRAY_SIZE(ethnl_linkstate_get_policy) - 1,
790 	},
791 	{
792 		.cmd	= ETHTOOL_MSG_DEBUG_GET,
793 		.doit	= ethnl_default_doit,
794 		.start	= ethnl_default_start,
795 		.dumpit	= ethnl_default_dumpit,
796 		.done	= ethnl_default_done,
797 		.policy = ethnl_debug_get_policy,
798 		.maxattr = ARRAY_SIZE(ethnl_debug_get_policy) - 1,
799 	},
800 	{
801 		.cmd	= ETHTOOL_MSG_DEBUG_SET,
802 		.flags	= GENL_UNS_ADMIN_PERM,
803 		.doit	= ethnl_set_debug,
804 		.policy = ethnl_debug_set_policy,
805 		.maxattr = ARRAY_SIZE(ethnl_debug_set_policy) - 1,
806 	},
807 	{
808 		.cmd	= ETHTOOL_MSG_WOL_GET,
809 		.flags	= GENL_UNS_ADMIN_PERM,
810 		.doit	= ethnl_default_doit,
811 		.start	= ethnl_default_start,
812 		.dumpit	= ethnl_default_dumpit,
813 		.done	= ethnl_default_done,
814 		.policy = ethnl_wol_get_policy,
815 		.maxattr = ARRAY_SIZE(ethnl_wol_get_policy) - 1,
816 	},
817 	{
818 		.cmd	= ETHTOOL_MSG_WOL_SET,
819 		.flags	= GENL_UNS_ADMIN_PERM,
820 		.doit	= ethnl_set_wol,
821 		.policy = ethnl_wol_set_policy,
822 		.maxattr = ARRAY_SIZE(ethnl_wol_set_policy) - 1,
823 	},
824 	{
825 		.cmd	= ETHTOOL_MSG_FEATURES_GET,
826 		.doit	= ethnl_default_doit,
827 		.start	= ethnl_default_start,
828 		.dumpit	= ethnl_default_dumpit,
829 		.done	= ethnl_default_done,
830 		.policy = ethnl_features_get_policy,
831 		.maxattr = ARRAY_SIZE(ethnl_features_get_policy) - 1,
832 	},
833 	{
834 		.cmd	= ETHTOOL_MSG_FEATURES_SET,
835 		.flags	= GENL_UNS_ADMIN_PERM,
836 		.doit	= ethnl_set_features,
837 		.policy = ethnl_features_set_policy,
838 		.maxattr = ARRAY_SIZE(ethnl_features_set_policy) - 1,
839 	},
840 	{
841 		.cmd	= ETHTOOL_MSG_PRIVFLAGS_GET,
842 		.doit	= ethnl_default_doit,
843 		.start	= ethnl_default_start,
844 		.dumpit	= ethnl_default_dumpit,
845 		.done	= ethnl_default_done,
846 		.policy = ethnl_privflags_get_policy,
847 		.maxattr = ARRAY_SIZE(ethnl_privflags_get_policy) - 1,
848 	},
849 	{
850 		.cmd	= ETHTOOL_MSG_PRIVFLAGS_SET,
851 		.flags	= GENL_UNS_ADMIN_PERM,
852 		.doit	= ethnl_set_privflags,
853 		.policy = ethnl_privflags_set_policy,
854 		.maxattr = ARRAY_SIZE(ethnl_privflags_set_policy) - 1,
855 	},
856 	{
857 		.cmd	= ETHTOOL_MSG_RINGS_GET,
858 		.doit	= ethnl_default_doit,
859 		.start	= ethnl_default_start,
860 		.dumpit	= ethnl_default_dumpit,
861 		.done	= ethnl_default_done,
862 		.policy = ethnl_rings_get_policy,
863 		.maxattr = ARRAY_SIZE(ethnl_rings_get_policy) - 1,
864 	},
865 	{
866 		.cmd	= ETHTOOL_MSG_RINGS_SET,
867 		.flags	= GENL_UNS_ADMIN_PERM,
868 		.doit	= ethnl_set_rings,
869 		.policy = ethnl_rings_set_policy,
870 		.maxattr = ARRAY_SIZE(ethnl_rings_set_policy) - 1,
871 	},
872 	{
873 		.cmd	= ETHTOOL_MSG_CHANNELS_GET,
874 		.doit	= ethnl_default_doit,
875 		.start	= ethnl_default_start,
876 		.dumpit	= ethnl_default_dumpit,
877 		.done	= ethnl_default_done,
878 		.policy = ethnl_channels_get_policy,
879 		.maxattr = ARRAY_SIZE(ethnl_channels_get_policy) - 1,
880 	},
881 	{
882 		.cmd	= ETHTOOL_MSG_CHANNELS_SET,
883 		.flags	= GENL_UNS_ADMIN_PERM,
884 		.doit	= ethnl_set_channels,
885 		.policy = ethnl_channels_set_policy,
886 		.maxattr = ARRAY_SIZE(ethnl_channels_set_policy) - 1,
887 	},
888 	{
889 		.cmd	= ETHTOOL_MSG_COALESCE_GET,
890 		.doit	= ethnl_default_doit,
891 		.start	= ethnl_default_start,
892 		.dumpit	= ethnl_default_dumpit,
893 		.done	= ethnl_default_done,
894 		.policy = ethnl_coalesce_get_policy,
895 		.maxattr = ARRAY_SIZE(ethnl_coalesce_get_policy) - 1,
896 	},
897 	{
898 		.cmd	= ETHTOOL_MSG_COALESCE_SET,
899 		.flags	= GENL_UNS_ADMIN_PERM,
900 		.doit	= ethnl_set_coalesce,
901 		.policy = ethnl_coalesce_set_policy,
902 		.maxattr = ARRAY_SIZE(ethnl_coalesce_set_policy) - 1,
903 	},
904 	{
905 		.cmd	= ETHTOOL_MSG_PAUSE_GET,
906 		.doit	= ethnl_default_doit,
907 		.start	= ethnl_default_start,
908 		.dumpit	= ethnl_default_dumpit,
909 		.done	= ethnl_default_done,
910 		.policy = ethnl_pause_get_policy,
911 		.maxattr = ARRAY_SIZE(ethnl_pause_get_policy) - 1,
912 	},
913 	{
914 		.cmd	= ETHTOOL_MSG_PAUSE_SET,
915 		.flags	= GENL_UNS_ADMIN_PERM,
916 		.doit	= ethnl_set_pause,
917 		.policy = ethnl_pause_set_policy,
918 		.maxattr = ARRAY_SIZE(ethnl_pause_set_policy) - 1,
919 	},
920 	{
921 		.cmd	= ETHTOOL_MSG_EEE_GET,
922 		.doit	= ethnl_default_doit,
923 		.start	= ethnl_default_start,
924 		.dumpit	= ethnl_default_dumpit,
925 		.done	= ethnl_default_done,
926 		.policy = ethnl_eee_get_policy,
927 		.maxattr = ARRAY_SIZE(ethnl_eee_get_policy) - 1,
928 	},
929 	{
930 		.cmd	= ETHTOOL_MSG_EEE_SET,
931 		.flags	= GENL_UNS_ADMIN_PERM,
932 		.doit	= ethnl_set_eee,
933 		.policy = ethnl_eee_set_policy,
934 		.maxattr = ARRAY_SIZE(ethnl_eee_set_policy) - 1,
935 	},
936 	{
937 		.cmd	= ETHTOOL_MSG_TSINFO_GET,
938 		.doit	= ethnl_default_doit,
939 		.start	= ethnl_default_start,
940 		.dumpit	= ethnl_default_dumpit,
941 		.done	= ethnl_default_done,
942 		.policy = ethnl_tsinfo_get_policy,
943 		.maxattr = ARRAY_SIZE(ethnl_tsinfo_get_policy) - 1,
944 	},
945 	{
946 		.cmd	= ETHTOOL_MSG_CABLE_TEST_ACT,
947 		.flags	= GENL_UNS_ADMIN_PERM,
948 		.doit	= ethnl_act_cable_test,
949 		.policy = ethnl_cable_test_act_policy,
950 		.maxattr = ARRAY_SIZE(ethnl_cable_test_act_policy) - 1,
951 	},
952 	{
953 		.cmd	= ETHTOOL_MSG_CABLE_TEST_TDR_ACT,
954 		.flags	= GENL_UNS_ADMIN_PERM,
955 		.doit	= ethnl_act_cable_test_tdr,
956 		.policy = ethnl_cable_test_tdr_act_policy,
957 		.maxattr = ARRAY_SIZE(ethnl_cable_test_tdr_act_policy) - 1,
958 	},
959 	{
960 		.cmd	= ETHTOOL_MSG_TUNNEL_INFO_GET,
961 		.doit	= ethnl_tunnel_info_doit,
962 		.start	= ethnl_tunnel_info_start,
963 		.dumpit	= ethnl_tunnel_info_dumpit,
964 		.policy = ethnl_tunnel_info_get_policy,
965 		.maxattr = ARRAY_SIZE(ethnl_tunnel_info_get_policy) - 1,
966 	},
967 	{
968 		.cmd	= ETHTOOL_MSG_FEC_GET,
969 		.doit	= ethnl_default_doit,
970 		.start	= ethnl_default_start,
971 		.dumpit	= ethnl_default_dumpit,
972 		.done	= ethnl_default_done,
973 		.policy = ethnl_fec_get_policy,
974 		.maxattr = ARRAY_SIZE(ethnl_fec_get_policy) - 1,
975 	},
976 	{
977 		.cmd	= ETHTOOL_MSG_FEC_SET,
978 		.flags	= GENL_UNS_ADMIN_PERM,
979 		.doit	= ethnl_set_fec,
980 		.policy = ethnl_fec_set_policy,
981 		.maxattr = ARRAY_SIZE(ethnl_fec_set_policy) - 1,
982 	},
983 	{
984 		.cmd	= ETHTOOL_MSG_MODULE_EEPROM_GET,
985 		.flags  = GENL_UNS_ADMIN_PERM,
986 		.doit	= ethnl_default_doit,
987 		.start	= ethnl_default_start,
988 		.dumpit	= ethnl_default_dumpit,
989 		.done	= ethnl_default_done,
990 		.policy = ethnl_module_eeprom_get_policy,
991 		.maxattr = ARRAY_SIZE(ethnl_module_eeprom_get_policy) - 1,
992 	},
993 	{
994 		.cmd	= ETHTOOL_MSG_STATS_GET,
995 		.doit	= ethnl_default_doit,
996 		.start	= ethnl_default_start,
997 		.dumpit	= ethnl_default_dumpit,
998 		.done	= ethnl_default_done,
999 		.policy = ethnl_stats_get_policy,
1000 		.maxattr = ARRAY_SIZE(ethnl_stats_get_policy) - 1,
1001 	},
1002 	{
1003 		.cmd	= ETHTOOL_MSG_PHC_VCLOCKS_GET,
1004 		.doit	= ethnl_default_doit,
1005 		.start	= ethnl_default_start,
1006 		.dumpit	= ethnl_default_dumpit,
1007 		.done	= ethnl_default_done,
1008 		.policy = ethnl_phc_vclocks_get_policy,
1009 		.maxattr = ARRAY_SIZE(ethnl_phc_vclocks_get_policy) - 1,
1010 	},
1011 	{
1012 		.cmd	= ETHTOOL_MSG_MODULE_GET,
1013 		.doit	= ethnl_default_doit,
1014 		.start	= ethnl_default_start,
1015 		.dumpit	= ethnl_default_dumpit,
1016 		.done	= ethnl_default_done,
1017 		.policy = ethnl_module_get_policy,
1018 		.maxattr = ARRAY_SIZE(ethnl_module_get_policy) - 1,
1019 	},
1020 	{
1021 		.cmd	= ETHTOOL_MSG_MODULE_SET,
1022 		.flags	= GENL_UNS_ADMIN_PERM,
1023 		.doit	= ethnl_set_module,
1024 		.policy = ethnl_module_set_policy,
1025 		.maxattr = ARRAY_SIZE(ethnl_module_set_policy) - 1,
1026 	},
1027 	{
1028 		.cmd	= ETHTOOL_MSG_PSE_GET,
1029 		.doit	= ethnl_default_doit,
1030 		.start	= ethnl_default_start,
1031 		.dumpit	= ethnl_default_dumpit,
1032 		.done	= ethnl_default_done,
1033 		.policy = ethnl_pse_get_policy,
1034 		.maxattr = ARRAY_SIZE(ethnl_pse_get_policy) - 1,
1035 	},
1036 	{
1037 		.cmd	= ETHTOOL_MSG_PSE_SET,
1038 		.flags	= GENL_UNS_ADMIN_PERM,
1039 		.doit	= ethnl_set_pse,
1040 		.policy = ethnl_pse_set_policy,
1041 		.maxattr = ARRAY_SIZE(ethnl_pse_set_policy) - 1,
1042 	},
1043 };
1044 
1045 static const struct genl_multicast_group ethtool_nl_mcgrps[] = {
1046 	[ETHNL_MCGRP_MONITOR] = { .name = ETHTOOL_MCGRP_MONITOR_NAME },
1047 };
1048 
1049 static struct genl_family ethtool_genl_family __ro_after_init = {
1050 	.name		= ETHTOOL_GENL_NAME,
1051 	.version	= ETHTOOL_GENL_VERSION,
1052 	.netnsok	= true,
1053 	.parallel_ops	= true,
1054 	.ops		= ethtool_genl_ops,
1055 	.n_ops		= ARRAY_SIZE(ethtool_genl_ops),
1056 	.resv_start_op	= ETHTOOL_MSG_MODULE_GET + 1,
1057 	.mcgrps		= ethtool_nl_mcgrps,
1058 	.n_mcgrps	= ARRAY_SIZE(ethtool_nl_mcgrps),
1059 };
1060 
1061 /* module setup */
1062 
ethnl_init(void)1063 static int __init ethnl_init(void)
1064 {
1065 	int ret;
1066 
1067 	ret = genl_register_family(&ethtool_genl_family);
1068 	if (WARN(ret < 0, "ethtool: genetlink family registration failed"))
1069 		return ret;
1070 	ethnl_ok = true;
1071 
1072 	ret = register_netdevice_notifier(&ethnl_netdev_notifier);
1073 	WARN(ret < 0, "ethtool: net device notifier registration failed");
1074 	return ret;
1075 }
1076 
1077 subsys_initcall(ethnl_init);
1078