// SPDX-License-Identifier: GPL-2.0-only

  #include <net/sock.h>

  #include <linux/ethtool_netlink.h>
  #include "netlink.h"

  static struct genl_family ethtool_genl_family;

  static bool ethnl_ok __read_mostly;

  static u32 ethnl_bcast_seq;

  #define ETHTOOL_FLAGS_BASIC (ETHTOOL_FLAG_COMPACT_BITSETS |	\
  			     ETHTOOL_FLAG_OMIT_REPLY)
  #define ETHTOOL_FLAGS_STATS (ETHTOOL_FLAGS_BASIC | ETHTOOL_FLAG_STATS)

  const struct nla_policy ethnl_header_policy[] = {

  	[ETHTOOL_A_HEADER_DEV_INDEX]	= { .type = NLA_U32 },
  	[ETHTOOL_A_HEADER_DEV_NAME]	= { .type = NLA_NUL_STRING,
  					    .len = ALTIFNAMSIZ - 1 },

  	[ETHTOOL_A_HEADER_FLAGS]	= NLA_POLICY_MASK(NLA_U32,
  							  ETHTOOL_FLAGS_BASIC),
  };
  
  const struct nla_policy ethnl_header_policy_stats[] = {
  	[ETHTOOL_A_HEADER_DEV_INDEX]	= { .type = NLA_U32 },
  	[ETHTOOL_A_HEADER_DEV_NAME]	= { .type = NLA_NUL_STRING,
  					    .len = ALTIFNAMSIZ - 1 },
  	[ETHTOOL_A_HEADER_FLAGS]	= NLA_POLICY_MASK(NLA_U32,
  							  ETHTOOL_FLAGS_STATS),

  };
  
  /**

   * ethnl_parse_header_dev_get() - parse request header

   * @req_info:    structure to put results into
   * @header:      nest attribute with request header
   * @net:         request netns
   * @extack:      netlink extack for error reporting
   * @require_dev: fail if no device identified in header
   *
   * Parse request header in nested attribute @nest and puts results into
   * the structure pointed to by @req_info. Extack from @info is used for error
   * reporting. If req_info->dev is not null on return, reference to it has
   * been taken. If error is returned, *req_info is null initialized and no
   * reference is held.
   *
   * Return: 0 on success or negative error code
   */

  int 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)

  {

  	struct nlattr *tb[ARRAY_SIZE(ethnl_header_policy)];

  	const struct nlattr *devname_attr;
  	struct net_device *dev = NULL;

  	u32 flags = 0;

  	int ret;
  
  	if (!header) {
  		NL_SET_ERR_MSG(extack, "request header missing");
  		return -EINVAL;
  	}

  	/* No validation here, command policy should have a nested policy set
  	 * for the header, therefore validation should have already been done.
  	 */

  	ret = nla_parse_nested(tb, ARRAY_SIZE(ethnl_header_policy) - 1, header,

  			       NULL, extack);

  	if (ret < 0)
  		return ret;

  	if (tb[ETHTOOL_A_HEADER_FLAGS])

  		flags = nla_get_u32(tb[ETHTOOL_A_HEADER_FLAGS]);

  	devname_attr = tb[ETHTOOL_A_HEADER_DEV_NAME];

  	if (tb[ETHTOOL_A_HEADER_DEV_INDEX]) {
  		u32 ifindex = nla_get_u32(tb[ETHTOOL_A_HEADER_DEV_INDEX]);
  
  		dev = dev_get_by_index(net, ifindex);
  		if (!dev) {
  			NL_SET_ERR_MSG_ATTR(extack,
  					    tb[ETHTOOL_A_HEADER_DEV_INDEX],
  					    "no device matches ifindex");
  			return -ENODEV;
  		}
  		/* if both ifindex and ifname are passed, they must match */
  		if (devname_attr &&
  		    strncmp(dev->name, nla_data(devname_attr), IFNAMSIZ)) {
  			dev_put(dev);
  			NL_SET_ERR_MSG_ATTR(extack, header,
  					    "ifindex and name do not match");
  			return -ENODEV;
  		}
  	} else if (devname_attr) {
  		dev = dev_get_by_name(net, nla_data(devname_attr));
  		if (!dev) {
  			NL_SET_ERR_MSG_ATTR(extack, devname_attr,
  					    "no device matches name");
  			return -ENODEV;
  		}
  	} else if (require_dev) {
  		NL_SET_ERR_MSG_ATTR(extack, header,
  				    "neither ifindex nor name specified");
  		return -EINVAL;
  	}
  
  	if (dev && !netif_device_present(dev)) {
  		dev_put(dev);
  		NL_SET_ERR_MSG(extack, "device not present");
  		return -ENODEV;
  	}
  
  	req_info->dev = dev;

  	req_info->flags = flags;

  	return 0;
  }
  
  /**
   * ethnl_fill_reply_header() - Put common header into a reply message
   * @skb:      skb with the message
   * @dev:      network device to describe in header
   * @attrtype: attribute type to use for the nest
   *
   * Create a nested attribute with attributes describing given network device.
   *
   * Return: 0 on success, error value (-EMSGSIZE only) on error
   */
  int ethnl_fill_reply_header(struct sk_buff *skb, struct net_device *dev,
  			    u16 attrtype)
  {
  	struct nlattr *nest;
  
  	if (!dev)
  		return 0;
  	nest = nla_nest_start(skb, attrtype);
  	if (!nest)
  		return -EMSGSIZE;
  
  	if (nla_put_u32(skb, ETHTOOL_A_HEADER_DEV_INDEX, (u32)dev->ifindex) ||
  	    nla_put_string(skb, ETHTOOL_A_HEADER_DEV_NAME, dev->name))
  		goto nla_put_failure;
  	/* If more attributes are put into reply header, ethnl_header_size()
  	 * must be updated to account for them.
  	 */
  
  	nla_nest_end(skb, nest);
  	return 0;
  
  nla_put_failure:
  	nla_nest_cancel(skb, nest);
  	return -EMSGSIZE;
  }
  
  /**
   * ethnl_reply_init() - Create skb for a reply and fill device identification

   * @payload:      payload length (without netlink and genetlink header)
   * @dev:          device the reply is about (may be null)
   * @cmd:          ETHTOOL_MSG_* message type for reply
   * @hdr_attrtype: attribute type for common header
   * @info:         genetlink info of the received packet we respond to
   * @ehdrp:        place to store payload pointer returned by genlmsg_new()

   *
   * Return: pointer to allocated skb on success, NULL on error
   */
  struct sk_buff *ethnl_reply_init(size_t payload, struct net_device *dev, u8 cmd,
  				 u16 hdr_attrtype, struct genl_info *info,
  				 void **ehdrp)
  {
  	struct sk_buff *skb;
  
  	skb = genlmsg_new(payload, GFP_KERNEL);
  	if (!skb)
  		goto err;
  	*ehdrp = genlmsg_put_reply(skb, info, &ethtool_genl_family, 0, cmd);
  	if (!*ehdrp)
  		goto err_free;
  
  	if (dev) {
  		int ret;
  
  		ret = ethnl_fill_reply_header(skb, dev, hdr_attrtype);
  		if (ret < 0)
  			goto err_free;
  	}
  	return skb;
  
  err_free:
  	nlmsg_free(skb);
  err:
  	if (info)
  		GENL_SET_ERR_MSG(info, "failed to setup reply message");
  	return NULL;
  }

  void *ethnl_dump_put(struct sk_buff *skb, struct netlink_callback *cb, u8 cmd)
  {
  	return genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
  			   &ethtool_genl_family, 0, cmd);
  }

  void *ethnl_bcastmsg_put(struct sk_buff *skb, u8 cmd)

  {
  	return genlmsg_put(skb, 0, ++ethnl_bcast_seq, &ethtool_genl_family, 0,
  			   cmd);
  }

  int ethnl_multicast(struct sk_buff *skb, struct net_device *dev)

  {
  	return genlmsg_multicast_netns(&ethtool_genl_family, dev_net(dev), skb,
  				       0, ETHNL_MCGRP_MONITOR, GFP_KERNEL);
  }

  /* GET request helpers */
  
  /**
   * struct ethnl_dump_ctx - context structure for generic dumpit() callback

   * @ops:        request ops of currently processed message type
   * @req_info:   parsed request header of processed request
   * @reply_data: data needed to compose the reply
   * @pos_hash:   saved iteration position - hashbucket
   * @pos_idx:    saved iteration position - index

   *
   * These parameters are kept in struct netlink_callback as context preserved
   * between iterations. They are initialized by ethnl_default_start() and used
   * in ethnl_default_dumpit() and ethnl_default_done().
   */
  struct ethnl_dump_ctx {
  	const struct ethnl_request_ops	*ops;
  	struct ethnl_req_info		*req_info;
  	struct ethnl_reply_data		*reply_data;
  	int				pos_hash;
  	int				pos_idx;
  };
  
  static const struct ethnl_request_ops *
  ethnl_default_requests[__ETHTOOL_MSG_USER_CNT] = {

  	[ETHTOOL_MSG_STRSET_GET]	= &ethnl_strset_request_ops,

  	[ETHTOOL_MSG_LINKINFO_GET]	= &ethnl_linkinfo_request_ops,

  	[ETHTOOL_MSG_LINKMODES_GET]	= &ethnl_linkmodes_request_ops,

  	[ETHTOOL_MSG_LINKSTATE_GET]	= &ethnl_linkstate_request_ops,

  	[ETHTOOL_MSG_DEBUG_GET]		= &ethnl_debug_request_ops,

  	[ETHTOOL_MSG_WOL_GET]		= &ethnl_wol_request_ops,

  	[ETHTOOL_MSG_FEATURES_GET]	= &ethnl_features_request_ops,

  	[ETHTOOL_MSG_PRIVFLAGS_GET]	= &ethnl_privflags_request_ops,

  	[ETHTOOL_MSG_RINGS_GET]		= &ethnl_rings_request_ops,

  	[ETHTOOL_MSG_CHANNELS_GET]	= &ethnl_channels_request_ops,

  	[ETHTOOL_MSG_COALESCE_GET]	= &ethnl_coalesce_request_ops,

  	[ETHTOOL_MSG_PAUSE_GET]		= &ethnl_pause_request_ops,

  	[ETHTOOL_MSG_EEE_GET]		= &ethnl_eee_request_ops,

  	[ETHTOOL_MSG_TSINFO_GET]	= &ethnl_tsinfo_request_ops,

  };
  
  static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
  {
  	return (struct ethnl_dump_ctx *)cb->ctx;
  }
  
  /**
   * ethnl_default_parse() - Parse request message
   * @req_info:    pointer to structure to put data into

   * @tb:		 parsed attributes

   * @net:         request netns
   * @request_ops: struct request_ops for request type
   * @extack:      netlink extack for error reporting
   * @require_dev: fail if no device identified in header
   *
   * Parse universal request header and call request specific ->parse_request()
   * callback (if defined) to parse the rest of the message.
   *
   * Return: 0 on success or negative error code
   */
  static int 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)
  {

  	int ret;

  	ret = ethnl_parse_header_dev_get(req_info, tb[request_ops->hdr_attr],
  					 net, extack, require_dev);

  	if (ret < 0)

  		return ret;

  
  	if (request_ops->parse_request) {
  		ret = request_ops->parse_request(req_info, tb, extack);
  		if (ret < 0)

  			return ret;

  	}

  	return 0;

  }
  
  /**
   * ethnl_init_reply_data() - Initialize reply data for GET request

   * @reply_data: pointer to embedded struct ethnl_reply_data
   * @ops:        instance of struct ethnl_request_ops describing the layout
   * @dev:        network device to initialize the reply for

   *
   * Fills the reply data part with zeros and sets the dev member. Must be called
   * before calling the ->fill_reply() callback (for each iteration when handling
   * dump requests).
   */
  static void ethnl_init_reply_data(struct ethnl_reply_data *reply_data,
  				  const struct ethnl_request_ops *ops,
  				  struct net_device *dev)
  {
  	memset(reply_data, 0, ops->reply_data_size);
  	reply_data->dev = dev;
  }
  
  /* default ->doit() handler for GET type requests */
  static int ethnl_default_doit(struct sk_buff *skb, struct genl_info *info)
  {
  	struct ethnl_reply_data *reply_data = NULL;
  	struct ethnl_req_info *req_info = NULL;
  	const u8 cmd = info->genlhdr->cmd;
  	const struct ethnl_request_ops *ops;
  	struct sk_buff *rskb;
  	void *reply_payload;
  	int reply_len;
  	int ret;
  
  	ops = ethnl_default_requests[cmd];
  	if (WARN_ONCE(!ops, "cmd %u has no ethnl_request_ops
  ", cmd))
  		return -EOPNOTSUPP;
  	req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
  	if (!req_info)
  		return -ENOMEM;
  	reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
  	if (!reply_data) {
  		kfree(req_info);
  		return -ENOMEM;
  	}

  	ret = ethnl_default_parse(req_info, info->attrs, genl_info_net(info),
  				  ops, info->extack, !ops->allow_nodev_do);

  	if (ret < 0)
  		goto err_dev;
  	ethnl_init_reply_data(reply_data, ops, req_info->dev);
  
  	rtnl_lock();
  	ret = ops->prepare_data(req_info, reply_data, info);
  	rtnl_unlock();
  	if (ret < 0)
  		goto err_cleanup;

  	ret = ops->reply_size(req_info, reply_data);

  	if (ret < 0)
  		goto err_cleanup;

  	reply_len = ret + ethnl_reply_header_size();

  	ret = -ENOMEM;
  	rskb = ethnl_reply_init(reply_len, req_info->dev, ops->reply_cmd,
  				ops->hdr_attr, info, &reply_payload);
  	if (!rskb)
  		goto err_cleanup;
  	ret = ops->fill_reply(rskb, req_info, reply_data);
  	if (ret < 0)
  		goto err_msg;
  	if (ops->cleanup_data)
  		ops->cleanup_data(reply_data);
  
  	genlmsg_end(rskb, reply_payload);
  	if (req_info->dev)
  		dev_put(req_info->dev);
  	kfree(reply_data);
  	kfree(req_info);
  	return genlmsg_reply(rskb, info);
  
  err_msg:
  	WARN_ONCE(ret == -EMSGSIZE, "calculated message payload length (%d) not sufficient
  ", reply_len);
  	nlmsg_free(rskb);
  err_cleanup:
  	if (ops->cleanup_data)
  		ops->cleanup_data(reply_data);
  err_dev:
  	if (req_info->dev)
  		dev_put(req_info->dev);
  	kfree(reply_data);
  	kfree(req_info);
  	return ret;
  }
  
  static int ethnl_default_dump_one(struct sk_buff *skb, struct net_device *dev,

  				  const struct ethnl_dump_ctx *ctx,
  				  struct netlink_callback *cb)

  {

  	void *ehdr;

  	int ret;

  	ehdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
  			   &ethtool_genl_family, 0, ctx->ops->reply_cmd);
  	if (!ehdr)
  		return -EMSGSIZE;

  	ethnl_init_reply_data(ctx->reply_data, ctx->ops, dev);
  	rtnl_lock();
  	ret = ctx->ops->prepare_data(ctx->req_info, ctx->reply_data, NULL);
  	rtnl_unlock();
  	if (ret < 0)
  		goto out;
  	ret = ethnl_fill_reply_header(skb, dev, ctx->ops->hdr_attr);
  	if (ret < 0)
  		goto out;
  	ret = ctx->ops->fill_reply(skb, ctx->req_info, ctx->reply_data);
  
  out:
  	if (ctx->ops->cleanup_data)
  		ctx->ops->cleanup_data(ctx->reply_data);
  	ctx->reply_data->dev = NULL;

  	if (ret < 0)
  		genlmsg_cancel(skb, ehdr);
  	else
  		genlmsg_end(skb, ehdr);

  	return ret;
  }
  
  /* Default ->dumpit() handler for GET requests. Device iteration copied from
   * rtnl_dump_ifinfo(); we have to be more careful about device hashtable
   * persistence as we cannot guarantee to hold RTNL lock through the whole
   * function as rtnetnlink does.
   */
  static int ethnl_default_dumpit(struct sk_buff *skb,
  				struct netlink_callback *cb)
  {
  	struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
  	struct net *net = sock_net(skb->sk);
  	int s_idx = ctx->pos_idx;
  	int h, idx = 0;
  	int ret = 0;

  
  	rtnl_lock();
  	for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
  		struct hlist_head *head;
  		struct net_device *dev;
  		unsigned int seq;
  
  		head = &net->dev_index_head[h];
  
  restart_chain:
  		seq = net->dev_base_seq;
  		cb->seq = seq;
  		idx = 0;
  		hlist_for_each_entry(dev, head, index_hlist) {
  			if (idx < s_idx)
  				goto cont;
  			dev_hold(dev);
  			rtnl_unlock();

  			ret = ethnl_default_dump_one(skb, dev, ctx, cb);

  			dev_put(dev);
  			if (ret < 0) {

  				if (ret == -EOPNOTSUPP)
  					goto lock_and_cont;
  				if (likely(skb->len))
  					ret = skb->len;
  				goto out;
  			}

  lock_and_cont:
  			rtnl_lock();
  			if (net->dev_base_seq != seq) {
  				s_idx = idx + 1;
  				goto restart_chain;
  			}
  cont:
  			idx++;
  		}
  
  	}
  	rtnl_unlock();
  
  out:
  	ctx->pos_hash = h;
  	ctx->pos_idx = idx;
  	nl_dump_check_consistent(cb, nlmsg_hdr(skb));
  
  	return ret;
  }
  
  /* generic ->start() handler for GET requests */
  static int ethnl_default_start(struct netlink_callback *cb)
  {

  	const struct genl_dumpit_info *info = genl_dumpit_info(cb);

  	struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
  	struct ethnl_reply_data *reply_data;
  	const struct ethnl_request_ops *ops;
  	struct ethnl_req_info *req_info;
  	struct genlmsghdr *ghdr;
  	int ret;
  
  	BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
  
  	ghdr = nlmsg_data(cb->nlh);
  	ops = ethnl_default_requests[ghdr->cmd];
  	if (WARN_ONCE(!ops, "cmd %u has no ethnl_request_ops
  ", ghdr->cmd))
  		return -EOPNOTSUPP;
  	req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
  	if (!req_info)
  		return -ENOMEM;
  	reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
  	if (!reply_data) {

  		ret = -ENOMEM;
  		goto free_req_info;

  	}

  	ret = ethnl_default_parse(req_info, info->attrs, sock_net(cb->skb->sk),
  				  ops, cb->extack, false);

  	if (req_info->dev) {
  		/* We ignore device specification in dump requests but as the
  		 * same parser as for non-dump (doit) requests is used, it
  		 * would take reference to the device if it finds one
  		 */
  		dev_put(req_info->dev);
  		req_info->dev = NULL;
  	}
  	if (ret < 0)

  		goto free_reply_data;

  
  	ctx->ops = ops;
  	ctx->req_info = req_info;
  	ctx->reply_data = reply_data;
  	ctx->pos_hash = 0;
  	ctx->pos_idx = 0;
  
  	return 0;

  
  free_reply_data:
  	kfree(reply_data);
  free_req_info:
  	kfree(req_info);
  
  	return ret;

  }
  
  /* default ->done() handler for GET requests */
  static int ethnl_default_done(struct netlink_callback *cb)
  {
  	struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
  
  	kfree(ctx->reply_data);
  	kfree(ctx->req_info);
  
  	return 0;
  }

  static const struct ethnl_request_ops *
  ethnl_default_notify_ops[ETHTOOL_MSG_KERNEL_MAX + 1] = {

  	[ETHTOOL_MSG_LINKINFO_NTF]	= &ethnl_linkinfo_request_ops,

  	[ETHTOOL_MSG_LINKMODES_NTF]	= &ethnl_linkmodes_request_ops,

  	[ETHTOOL_MSG_DEBUG_NTF]		= &ethnl_debug_request_ops,

  	[ETHTOOL_MSG_WOL_NTF]		= &ethnl_wol_request_ops,

  	[ETHTOOL_MSG_FEATURES_NTF]	= &ethnl_features_request_ops,

  	[ETHTOOL_MSG_PRIVFLAGS_NTF]	= &ethnl_privflags_request_ops,

  	[ETHTOOL_MSG_RINGS_NTF]		= &ethnl_rings_request_ops,

  	[ETHTOOL_MSG_CHANNELS_NTF]	= &ethnl_channels_request_ops,

  	[ETHTOOL_MSG_COALESCE_NTF]	= &ethnl_coalesce_request_ops,

  	[ETHTOOL_MSG_PAUSE_NTF]		= &ethnl_pause_request_ops,

  	[ETHTOOL_MSG_EEE_NTF]		= &ethnl_eee_request_ops,

  };
  
  /* default notification handler */
  static void ethnl_default_notify(struct net_device *dev, unsigned int cmd,
  				 const void *data)
  {
  	struct ethnl_reply_data *reply_data;
  	const struct ethnl_request_ops *ops;
  	struct ethnl_req_info *req_info;
  	struct sk_buff *skb;
  	void *reply_payload;
  	int reply_len;
  	int ret;
  
  	if (WARN_ONCE(cmd > ETHTOOL_MSG_KERNEL_MAX ||
  		      !ethnl_default_notify_ops[cmd],
  		      "unexpected notification type %u
  ", cmd))
  		return;
  	ops = ethnl_default_notify_ops[cmd];
  	req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
  	if (!req_info)
  		return;
  	reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
  	if (!reply_data) {
  		kfree(req_info);
  		return;
  	}
  
  	req_info->dev = dev;
  	req_info->flags |= ETHTOOL_FLAG_COMPACT_BITSETS;
  
  	ethnl_init_reply_data(reply_data, ops, dev);
  	ret = ops->prepare_data(req_info, reply_data, NULL);
  	if (ret < 0)
  		goto err_cleanup;

  	ret = ops->reply_size(req_info, reply_data);

  	if (ret < 0)
  		goto err_cleanup;

  	reply_len = ret + ethnl_reply_header_size();

  	ret = -ENOMEM;
  	skb = genlmsg_new(reply_len, GFP_KERNEL);
  	if (!skb)
  		goto err_cleanup;
  	reply_payload = ethnl_bcastmsg_put(skb, cmd);
  	if (!reply_payload)
  		goto err_skb;
  	ret = ethnl_fill_reply_header(skb, dev, ops->hdr_attr);
  	if (ret < 0)
  		goto err_msg;
  	ret = ops->fill_reply(skb, req_info, reply_data);
  	if (ret < 0)
  		goto err_msg;
  	if (ops->cleanup_data)
  		ops->cleanup_data(reply_data);
  
  	genlmsg_end(skb, reply_payload);
  	kfree(reply_data);
  	kfree(req_info);
  	ethnl_multicast(skb, dev);
  	return;
  
  err_msg:
  	WARN_ONCE(ret == -EMSGSIZE,
  		  "calculated message payload length (%d) not sufficient
  ",
  		  reply_len);
  err_skb:
  	nlmsg_free(skb);
  err_cleanup:
  	if (ops->cleanup_data)
  		ops->cleanup_data(reply_data);
  	kfree(reply_data);
  	kfree(req_info);
  	return;
  }

  /* notifications */
  
  typedef void (*ethnl_notify_handler_t)(struct net_device *dev, unsigned int cmd,
  				       const void *data);
  
  static const ethnl_notify_handler_t ethnl_notify_handlers[] = {

  	[ETHTOOL_MSG_LINKINFO_NTF]	= ethnl_default_notify,

  	[ETHTOOL_MSG_LINKMODES_NTF]	= ethnl_default_notify,

  	[ETHTOOL_MSG_DEBUG_NTF]		= ethnl_default_notify,

  	[ETHTOOL_MSG_WOL_NTF]		= ethnl_default_notify,

  	[ETHTOOL_MSG_FEATURES_NTF]	= ethnl_default_notify,

  	[ETHTOOL_MSG_PRIVFLAGS_NTF]	= ethnl_default_notify,

  	[ETHTOOL_MSG_RINGS_NTF]		= ethnl_default_notify,

  	[ETHTOOL_MSG_CHANNELS_NTF]	= ethnl_default_notify,

  	[ETHTOOL_MSG_COALESCE_NTF]	= ethnl_default_notify,

  	[ETHTOOL_MSG_PAUSE_NTF]		= ethnl_default_notify,

  	[ETHTOOL_MSG_EEE_NTF]		= ethnl_default_notify,

  };
  
  void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data)
  {
  	if (unlikely(!ethnl_ok))
  		return;
  	ASSERT_RTNL();
  
  	if (likely(cmd < ARRAY_SIZE(ethnl_notify_handlers) &&
  		   ethnl_notify_handlers[cmd]))
  		ethnl_notify_handlers[cmd](dev, cmd, data);
  	else
  		WARN_ONCE(1, "notification %u not implemented (dev=%s)
  ",
  			  cmd, netdev_name(dev));
  }
  EXPORT_SYMBOL(ethtool_notify);

  static void ethnl_notify_features(struct netdev_notifier_info *info)
  {
  	struct net_device *dev = netdev_notifier_info_to_dev(info);
  
  	ethtool_notify(dev, ETHTOOL_MSG_FEATURES_NTF, NULL);
  }
  
  static int ethnl_netdev_event(struct notifier_block *this, unsigned long event,
  			      void *ptr)
  {
  	switch (event) {
  	case NETDEV_FEAT_CHANGE:
  		ethnl_notify_features(ptr);
  		break;
  	}
  
  	return NOTIFY_DONE;
  }
  
  static struct notifier_block ethnl_netdev_notifier = {
  	.notifier_call = ethnl_netdev_event,
  };

  /* genetlink setup */
  
  static const struct genl_ops ethtool_genl_ops[] = {

  	{
  		.cmd	= ETHTOOL_MSG_STRSET_GET,
  		.doit	= ethnl_default_doit,
  		.start	= ethnl_default_start,
  		.dumpit	= ethnl_default_dumpit,
  		.done	= ethnl_default_done,

  		.policy = ethnl_strset_get_policy,
  		.maxattr = ARRAY_SIZE(ethnl_strset_get_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_LINKINFO_GET,
  		.doit	= ethnl_default_doit,
  		.start	= ethnl_default_start,
  		.dumpit	= ethnl_default_dumpit,
  		.done	= ethnl_default_done,

  		.policy = ethnl_linkinfo_get_policy,
  		.maxattr = ARRAY_SIZE(ethnl_linkinfo_get_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_LINKINFO_SET,
  		.flags	= GENL_UNS_ADMIN_PERM,
  		.doit	= ethnl_set_linkinfo,

  		.policy = ethnl_linkinfo_set_policy,
  		.maxattr = ARRAY_SIZE(ethnl_linkinfo_set_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_LINKMODES_GET,
  		.doit	= ethnl_default_doit,
  		.start	= ethnl_default_start,
  		.dumpit	= ethnl_default_dumpit,
  		.done	= ethnl_default_done,

  		.policy = ethnl_linkmodes_get_policy,
  		.maxattr = ARRAY_SIZE(ethnl_linkmodes_get_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_LINKMODES_SET,
  		.flags	= GENL_UNS_ADMIN_PERM,
  		.doit	= ethnl_set_linkmodes,

  		.policy = ethnl_linkmodes_set_policy,
  		.maxattr = ARRAY_SIZE(ethnl_linkmodes_set_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_LINKSTATE_GET,
  		.doit	= ethnl_default_doit,
  		.start	= ethnl_default_start,
  		.dumpit	= ethnl_default_dumpit,
  		.done	= ethnl_default_done,

  		.policy = ethnl_linkstate_get_policy,
  		.maxattr = ARRAY_SIZE(ethnl_linkstate_get_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_DEBUG_GET,
  		.doit	= ethnl_default_doit,
  		.start	= ethnl_default_start,
  		.dumpit	= ethnl_default_dumpit,
  		.done	= ethnl_default_done,

  		.policy = ethnl_debug_get_policy,
  		.maxattr = ARRAY_SIZE(ethnl_debug_get_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_DEBUG_SET,
  		.flags	= GENL_UNS_ADMIN_PERM,
  		.doit	= ethnl_set_debug,

  		.policy = ethnl_debug_set_policy,
  		.maxattr = ARRAY_SIZE(ethnl_debug_set_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_WOL_GET,
  		.flags	= GENL_UNS_ADMIN_PERM,
  		.doit	= ethnl_default_doit,
  		.start	= ethnl_default_start,
  		.dumpit	= ethnl_default_dumpit,
  		.done	= ethnl_default_done,

  		.policy = ethnl_wol_get_policy,
  		.maxattr = ARRAY_SIZE(ethnl_wol_get_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_WOL_SET,
  		.flags	= GENL_UNS_ADMIN_PERM,
  		.doit	= ethnl_set_wol,

  		.policy = ethnl_wol_set_policy,
  		.maxattr = ARRAY_SIZE(ethnl_wol_set_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_FEATURES_GET,
  		.doit	= ethnl_default_doit,
  		.start	= ethnl_default_start,
  		.dumpit	= ethnl_default_dumpit,
  		.done	= ethnl_default_done,

  		.policy = ethnl_features_get_policy,
  		.maxattr = ARRAY_SIZE(ethnl_features_get_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_FEATURES_SET,
  		.flags	= GENL_UNS_ADMIN_PERM,
  		.doit	= ethnl_set_features,

  		.policy = ethnl_features_set_policy,
  		.maxattr = ARRAY_SIZE(ethnl_features_set_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_PRIVFLAGS_GET,
  		.doit	= ethnl_default_doit,
  		.start	= ethnl_default_start,
  		.dumpit	= ethnl_default_dumpit,
  		.done	= ethnl_default_done,

  		.policy = ethnl_privflags_get_policy,
  		.maxattr = ARRAY_SIZE(ethnl_privflags_get_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_PRIVFLAGS_SET,
  		.flags	= GENL_UNS_ADMIN_PERM,
  		.doit	= ethnl_set_privflags,

  		.policy = ethnl_privflags_set_policy,
  		.maxattr = ARRAY_SIZE(ethnl_privflags_set_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_RINGS_GET,
  		.doit	= ethnl_default_doit,
  		.start	= ethnl_default_start,
  		.dumpit	= ethnl_default_dumpit,
  		.done	= ethnl_default_done,

  		.policy = ethnl_rings_get_policy,
  		.maxattr = ARRAY_SIZE(ethnl_rings_get_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_RINGS_SET,
  		.flags	= GENL_UNS_ADMIN_PERM,
  		.doit	= ethnl_set_rings,

  		.policy = ethnl_rings_set_policy,
  		.maxattr = ARRAY_SIZE(ethnl_rings_set_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_CHANNELS_GET,
  		.doit	= ethnl_default_doit,
  		.start	= ethnl_default_start,
  		.dumpit	= ethnl_default_dumpit,
  		.done	= ethnl_default_done,

  		.policy = ethnl_channels_get_policy,
  		.maxattr = ARRAY_SIZE(ethnl_channels_get_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_CHANNELS_SET,
  		.flags	= GENL_UNS_ADMIN_PERM,
  		.doit	= ethnl_set_channels,

  		.policy = ethnl_channels_set_policy,
  		.maxattr = ARRAY_SIZE(ethnl_channels_set_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_COALESCE_GET,
  		.doit	= ethnl_default_doit,
  		.start	= ethnl_default_start,
  		.dumpit	= ethnl_default_dumpit,
  		.done	= ethnl_default_done,

  		.policy = ethnl_coalesce_get_policy,
  		.maxattr = ARRAY_SIZE(ethnl_coalesce_get_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_COALESCE_SET,
  		.flags	= GENL_UNS_ADMIN_PERM,
  		.doit	= ethnl_set_coalesce,

  		.policy = ethnl_coalesce_set_policy,
  		.maxattr = ARRAY_SIZE(ethnl_coalesce_set_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_PAUSE_GET,
  		.doit	= ethnl_default_doit,
  		.start	= ethnl_default_start,
  		.dumpit	= ethnl_default_dumpit,
  		.done	= ethnl_default_done,

  		.policy = ethnl_pause_get_policy,
  		.maxattr = ARRAY_SIZE(ethnl_pause_get_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_PAUSE_SET,
  		.flags	= GENL_UNS_ADMIN_PERM,
  		.doit	= ethnl_set_pause,

  		.policy = ethnl_pause_set_policy,
  		.maxattr = ARRAY_SIZE(ethnl_pause_set_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_EEE_GET,
  		.doit	= ethnl_default_doit,
  		.start	= ethnl_default_start,
  		.dumpit	= ethnl_default_dumpit,
  		.done	= ethnl_default_done,

  		.policy = ethnl_eee_get_policy,
  		.maxattr = ARRAY_SIZE(ethnl_eee_get_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_EEE_SET,
  		.flags	= GENL_UNS_ADMIN_PERM,
  		.doit	= ethnl_set_eee,

  		.policy = ethnl_eee_set_policy,
  		.maxattr = ARRAY_SIZE(ethnl_eee_set_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_TSINFO_GET,
  		.doit	= ethnl_default_doit,
  		.start	= ethnl_default_start,
  		.dumpit	= ethnl_default_dumpit,
  		.done	= ethnl_default_done,

  		.policy = ethnl_tsinfo_get_policy,
  		.maxattr = ARRAY_SIZE(ethnl_tsinfo_get_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_CABLE_TEST_ACT,
  		.flags	= GENL_UNS_ADMIN_PERM,
  		.doit	= ethnl_act_cable_test,

  		.policy = ethnl_cable_test_act_policy,
  		.maxattr = ARRAY_SIZE(ethnl_cable_test_act_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_CABLE_TEST_TDR_ACT,
  		.flags	= GENL_UNS_ADMIN_PERM,
  		.doit	= ethnl_act_cable_test_tdr,

  		.policy = ethnl_cable_test_tdr_act_policy,
  		.maxattr = ARRAY_SIZE(ethnl_cable_test_tdr_act_policy) - 1,

  	},

  	{
  		.cmd	= ETHTOOL_MSG_TUNNEL_INFO_GET,
  		.doit	= ethnl_tunnel_info_doit,
  		.start	= ethnl_tunnel_info_start,
  		.dumpit	= ethnl_tunnel_info_dumpit,

  		.policy = ethnl_tunnel_info_get_policy,
  		.maxattr = ARRAY_SIZE(ethnl_tunnel_info_get_policy) - 1,

  	},

  };

  static const struct genl_multicast_group ethtool_nl_mcgrps[] = {
  	[ETHNL_MCGRP_MONITOR] = { .name = ETHTOOL_MCGRP_MONITOR_NAME },
  };

  static struct genl_family ethtool_genl_family __ro_after_init = {

  	.name		= ETHTOOL_GENL_NAME,
  	.version	= ETHTOOL_GENL_VERSION,
  	.netnsok	= true,
  	.parallel_ops	= true,
  	.ops		= ethtool_genl_ops,
  	.n_ops		= ARRAY_SIZE(ethtool_genl_ops),

  	.mcgrps		= ethtool_nl_mcgrps,
  	.n_mcgrps	= ARRAY_SIZE(ethtool_nl_mcgrps),

  };
  
  /* module setup */
  
  static int __init ethnl_init(void)
  {
  	int ret;
  
  	ret = genl_register_family(&ethtool_genl_family);
  	if (WARN(ret < 0, "ethtool: genetlink family registration failed"))
  		return ret;

  	ethnl_ok = true;

  	ret = register_netdevice_notifier(&ethnl_netdev_notifier);
  	WARN(ret < 0, "ethtool: net device notifier registration failed");
  	return ret;

  }
  
  subsys_initcall(ethnl_init);