459 lines
19 KiB
C
459 lines
19 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef _NET_ETHTOOL_NETLINK_H
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#define _NET_ETHTOOL_NETLINK_H
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#include <linux/ethtool_netlink.h>
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#include <linux/netdevice.h>
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#include <net/genetlink.h>
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#include <net/sock.h>
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struct ethnl_req_info;
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int ethnl_parse_header_dev_get(struct ethnl_req_info *req_info,
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const struct nlattr *nest, struct net *net,
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struct netlink_ext_ack *extack,
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bool require_dev);
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int ethnl_fill_reply_header(struct sk_buff *skb, struct net_device *dev,
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u16 attrtype);
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struct sk_buff *ethnl_reply_init(size_t payload, struct net_device *dev, u8 cmd,
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u16 hdr_attrtype, struct genl_info *info,
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void **ehdrp);
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void *ethnl_dump_put(struct sk_buff *skb, struct netlink_callback *cb, u8 cmd);
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void *ethnl_bcastmsg_put(struct sk_buff *skb, u8 cmd);
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int ethnl_multicast(struct sk_buff *skb, struct net_device *dev);
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/**
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* ethnl_strz_size() - calculate attribute length for fixed size string
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* @s: ETH_GSTRING_LEN sized string (may not be null terminated)
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*
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* Return: total length of an attribute with null terminated string from @s
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*/
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static inline int ethnl_strz_size(const char *s)
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{
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return nla_total_size(strnlen(s, ETH_GSTRING_LEN) + 1);
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}
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/**
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* ethnl_put_strz() - put string attribute with fixed size string
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* @skb: skb with the message
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* @attrtype: attribute type
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* @s: ETH_GSTRING_LEN sized string (may not be null terminated)
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*
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* Puts an attribute with null terminated string from @s into the message.
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*
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* Return: 0 on success, negative error code on failure
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*/
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static inline int ethnl_put_strz(struct sk_buff *skb, u16 attrtype,
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const char *s)
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{
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unsigned int len = strnlen(s, ETH_GSTRING_LEN);
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struct nlattr *attr;
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attr = nla_reserve(skb, attrtype, len + 1);
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if (!attr)
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return -EMSGSIZE;
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memcpy(nla_data(attr), s, len);
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((char *)nla_data(attr))[len] = '\0';
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return 0;
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}
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/**
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* ethnl_update_u32() - update u32 value from NLA_U32 attribute
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* @dst: value to update
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* @attr: netlink attribute with new value or null
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* @mod: pointer to bool for modification tracking
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*
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* Copy the u32 value from NLA_U32 netlink attribute @attr into variable
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* pointed to by @dst; do nothing if @attr is null. Bool pointed to by @mod
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* is set to true if this function changed the value of *dst, otherwise it
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* is left as is.
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*/
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static inline void ethnl_update_u32(u32 *dst, const struct nlattr *attr,
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bool *mod)
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{
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u32 val;
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if (!attr)
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return;
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val = nla_get_u32(attr);
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if (*dst == val)
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return;
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*dst = val;
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*mod = true;
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}
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/**
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* ethnl_update_u8() - update u8 value from NLA_U8 attribute
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* @dst: value to update
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* @attr: netlink attribute with new value or null
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* @mod: pointer to bool for modification tracking
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*
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* Copy the u8 value from NLA_U8 netlink attribute @attr into variable
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* pointed to by @dst; do nothing if @attr is null. Bool pointed to by @mod
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* is set to true if this function changed the value of *dst, otherwise it
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* is left as is.
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*/
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static inline void ethnl_update_u8(u8 *dst, const struct nlattr *attr,
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bool *mod)
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{
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u8 val;
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if (!attr)
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return;
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val = nla_get_u8(attr);
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if (*dst == val)
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return;
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*dst = val;
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*mod = true;
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}
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/**
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* ethnl_update_bool32() - update u32 used as bool from NLA_U8 attribute
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* @dst: value to update
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* @attr: netlink attribute with new value or null
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* @mod: pointer to bool for modification tracking
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*
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* Use the u8 value from NLA_U8 netlink attribute @attr to set u32 variable
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* pointed to by @dst to 0 (if zero) or 1 (if not); do nothing if @attr is
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* null. Bool pointed to by @mod is set to true if this function changed the
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* logical value of *dst, otherwise it is left as is.
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*/
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static inline void ethnl_update_bool32(u32 *dst, const struct nlattr *attr,
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bool *mod)
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{
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u8 val;
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if (!attr)
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return;
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val = !!nla_get_u8(attr);
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if (!!*dst == val)
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return;
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*dst = val;
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*mod = true;
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}
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/**
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* ethnl_update_bool() - updateb bool used as bool from NLA_U8 attribute
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* @dst: value to update
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* @attr: netlink attribute with new value or null
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* @mod: pointer to bool for modification tracking
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*
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* Use the bool value from NLA_U8 netlink attribute @attr to set bool variable
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* pointed to by @dst to 0 (if zero) or 1 (if not); do nothing if @attr is
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* null. Bool pointed to by @mod is set to true if this function changed the
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* logical value of *dst, otherwise it is left as is.
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*/
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static inline void ethnl_update_bool(bool *dst, const struct nlattr *attr,
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bool *mod)
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{
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u8 val;
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if (!attr)
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return;
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val = !!nla_get_u8(attr);
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if (!!*dst == val)
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return;
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*dst = val;
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*mod = true;
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}
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/**
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* ethnl_update_binary() - update binary data from NLA_BINARY attribute
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* @dst: value to update
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* @len: destination buffer length
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* @attr: netlink attribute with new value or null
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* @mod: pointer to bool for modification tracking
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*
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* Use the u8 value from NLA_U8 netlink attribute @attr to rewrite data block
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* of length @len at @dst by attribute payload; do nothing if @attr is null.
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* Bool pointed to by @mod is set to true if this function changed the logical
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* value of *dst, otherwise it is left as is.
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*/
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static inline void ethnl_update_binary(void *dst, unsigned int len,
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const struct nlattr *attr, bool *mod)
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{
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if (!attr)
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return;
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if (nla_len(attr) < len)
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len = nla_len(attr);
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if (!memcmp(dst, nla_data(attr), len))
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return;
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memcpy(dst, nla_data(attr), len);
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*mod = true;
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}
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/**
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* ethnl_update_bitfield32() - update u32 value from NLA_BITFIELD32 attribute
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* @dst: value to update
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* @attr: netlink attribute with new value or null
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* @mod: pointer to bool for modification tracking
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*
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* Update bits in u32 value which are set in attribute's mask to values from
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* attribute's value. Do nothing if @attr is null or the value wouldn't change;
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* otherwise, set bool pointed to by @mod to true.
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*/
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static inline void ethnl_update_bitfield32(u32 *dst, const struct nlattr *attr,
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bool *mod)
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{
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struct nla_bitfield32 change;
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u32 newval;
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if (!attr)
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return;
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change = nla_get_bitfield32(attr);
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newval = (*dst & ~change.selector) | (change.value & change.selector);
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if (*dst == newval)
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return;
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*dst = newval;
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*mod = true;
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}
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/**
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* ethnl_reply_header_size() - total size of reply header
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*
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* This is an upper estimate so that we do not need to hold RTNL lock longer
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* than necessary (to prevent rename between size estimate and composing the
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* message). Accounts only for device ifindex and name as those are the only
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* attributes ethnl_fill_reply_header() puts into the reply header.
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*/
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static inline unsigned int ethnl_reply_header_size(void)
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{
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return nla_total_size(nla_total_size(sizeof(u32)) +
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nla_total_size(IFNAMSIZ));
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}
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/* GET request handling */
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/* Unified processing of GET requests uses two data structures: request info
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* and reply data. Request info holds information parsed from client request
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* and its stays constant through all request processing. Reply data holds data
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* retrieved from ethtool_ops callbacks or other internal sources which is used
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* to compose the reply. When processing a dump request, request info is filled
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* only once (when the request message is parsed) but reply data is filled for
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* each reply message.
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*
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* Both structures consist of part common for all request types (struct
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* ethnl_req_info and struct ethnl_reply_data defined below) and optional
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* parts specific for each request type. Common part always starts at offset 0.
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*/
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/**
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* struct ethnl_req_info - base type of request information for GET requests
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* @dev: network device the request is for (may be null)
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* @dev_tracker: refcount tracker for @dev reference
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* @flags: request flags common for all request types
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*
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* This is a common base for request specific structures holding data from
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* parsed userspace request. These always embed struct ethnl_req_info at
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* zero offset.
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*/
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struct ethnl_req_info {
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struct net_device *dev;
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netdevice_tracker dev_tracker;
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u32 flags;
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};
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static inline void ethnl_parse_header_dev_put(struct ethnl_req_info *req_info)
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{
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netdev_put(req_info->dev, &req_info->dev_tracker);
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}
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/**
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* struct ethnl_reply_data - base type of reply data for GET requests
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* @dev: device for current reply message; in single shot requests it is
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* equal to ðnl_req_info.dev; in dumps it's different for each
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* reply message
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*
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* This is a common base for request specific structures holding data for
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* kernel reply message. These always embed struct ethnl_reply_data at zero
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* offset.
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*/
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struct ethnl_reply_data {
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struct net_device *dev;
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};
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int ethnl_ops_begin(struct net_device *dev);
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void ethnl_ops_complete(struct net_device *dev);
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/**
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* struct ethnl_request_ops - unified handling of GET and SET requests
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* @request_cmd: command id for request (GET)
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* @reply_cmd: command id for reply (GET_REPLY)
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* @hdr_attr: attribute type for request header
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* @req_info_size: size of request info
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* @reply_data_size: size of reply data
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* @allow_nodev_do: allow non-dump request with no device identification
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* @set_ntf_cmd: notification to generate on changes (SET)
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* @parse_request:
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* Parse request except common header (struct ethnl_req_info). Common
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* header is already filled on entry, the rest up to @repdata_offset
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* is zero initialized. This callback should only modify type specific
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* request info by parsed attributes from request message.
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* @prepare_data:
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* Retrieve and prepare data needed to compose a reply message. Calls to
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* ethtool_ops handlers are limited to this callback. Common reply data
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* (struct ethnl_reply_data) is filled on entry, type specific part after
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* it is zero initialized. This callback should only modify the type
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* specific part of reply data. Device identification from struct
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* ethnl_reply_data is to be used as for dump requests, it iterates
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* through network devices while dev member of struct ethnl_req_info
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* points to the device from client request.
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* @reply_size:
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* Estimate reply message size. Returned value must be sufficient for
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* message payload without common reply header. The callback may returned
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* estimate higher than actual message size if exact calculation would
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* not be worth the saved memory space.
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* @fill_reply:
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* Fill reply message payload (except for common header) from reply data.
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* The callback must not generate more payload than previously called
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* ->reply_size() estimated.
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* @cleanup_data:
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* Optional cleanup called when reply data is no longer needed. Can be
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* used e.g. to free any additional data structures outside the main
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* structure which were allocated by ->prepare_data(). When processing
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* dump requests, ->cleanup() is called for each message.
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* @set_validate:
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* Check if set operation is supported for a given device, and perform
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* extra input checks. Expected return values:
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* - 0 if the operation is a noop for the device (rare)
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* - 1 if operation should proceed to calling @set
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* - negative errno on errors
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* Called without any locks, just a reference on the netdev.
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* @set:
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* Execute the set operation. The implementation should return
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* - 0 if no configuration has changed
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* - 1 if configuration changed and notification should be generated
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* - negative errno on errors
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*
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* Description of variable parts of GET request handling when using the
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* unified infrastructure. When used, a pointer to an instance of this
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* structure is to be added to ðnl_default_requests array and generic
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* handlers ethnl_default_doit(), ethnl_default_dumpit(),
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* ethnl_default_start() and ethnl_default_done() used in @ethtool_genl_ops;
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* ethnl_default_notify() can be used in @ethnl_notify_handlers to send
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* notifications of the corresponding type.
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*/
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struct ethnl_request_ops {
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u8 request_cmd;
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u8 reply_cmd;
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u16 hdr_attr;
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unsigned int req_info_size;
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unsigned int reply_data_size;
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bool allow_nodev_do;
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u8 set_ntf_cmd;
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int (*parse_request)(struct ethnl_req_info *req_info,
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struct nlattr **tb,
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struct netlink_ext_ack *extack);
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int (*prepare_data)(const struct ethnl_req_info *req_info,
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struct ethnl_reply_data *reply_data,
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struct genl_info *info);
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int (*reply_size)(const struct ethnl_req_info *req_info,
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const struct ethnl_reply_data *reply_data);
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int (*fill_reply)(struct sk_buff *skb,
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const struct ethnl_req_info *req_info,
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const struct ethnl_reply_data *reply_data);
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void (*cleanup_data)(struct ethnl_reply_data *reply_data);
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int (*set_validate)(struct ethnl_req_info *req_info,
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struct genl_info *info);
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int (*set)(struct ethnl_req_info *req_info,
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struct genl_info *info);
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};
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/* request handlers */
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extern const struct ethnl_request_ops ethnl_strset_request_ops;
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extern const struct ethnl_request_ops ethnl_linkinfo_request_ops;
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extern const struct ethnl_request_ops ethnl_linkmodes_request_ops;
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extern const struct ethnl_request_ops ethnl_linkstate_request_ops;
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extern const struct ethnl_request_ops ethnl_debug_request_ops;
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extern const struct ethnl_request_ops ethnl_wol_request_ops;
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extern const struct ethnl_request_ops ethnl_features_request_ops;
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extern const struct ethnl_request_ops ethnl_privflags_request_ops;
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extern const struct ethnl_request_ops ethnl_rings_request_ops;
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extern const struct ethnl_request_ops ethnl_channels_request_ops;
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extern const struct ethnl_request_ops ethnl_coalesce_request_ops;
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extern const struct ethnl_request_ops ethnl_pause_request_ops;
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extern const struct ethnl_request_ops ethnl_eee_request_ops;
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extern const struct ethnl_request_ops ethnl_tsinfo_request_ops;
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extern const struct ethnl_request_ops ethnl_fec_request_ops;
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extern const struct ethnl_request_ops ethnl_module_eeprom_request_ops;
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extern const struct ethnl_request_ops ethnl_stats_request_ops;
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extern const struct ethnl_request_ops ethnl_phc_vclocks_request_ops;
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extern const struct ethnl_request_ops ethnl_module_request_ops;
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extern const struct ethnl_request_ops ethnl_pse_request_ops;
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extern const struct ethnl_request_ops ethnl_rss_request_ops;
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extern const struct ethnl_request_ops ethnl_plca_cfg_request_ops;
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extern const struct ethnl_request_ops ethnl_plca_status_request_ops;
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extern const struct ethnl_request_ops ethnl_mm_request_ops;
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extern const struct nla_policy ethnl_header_policy[ETHTOOL_A_HEADER_FLAGS + 1];
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extern const struct nla_policy ethnl_header_policy_stats[ETHTOOL_A_HEADER_FLAGS + 1];
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extern const struct nla_policy ethnl_strset_get_policy[ETHTOOL_A_STRSET_COUNTS_ONLY + 1];
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extern const struct nla_policy ethnl_linkinfo_get_policy[ETHTOOL_A_LINKINFO_HEADER + 1];
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extern const struct nla_policy ethnl_linkinfo_set_policy[ETHTOOL_A_LINKINFO_TP_MDIX_CTRL + 1];
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extern const struct nla_policy ethnl_linkmodes_get_policy[ETHTOOL_A_LINKMODES_HEADER + 1];
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extern const struct nla_policy ethnl_linkmodes_set_policy[ETHTOOL_A_LINKMODES_LANES + 1];
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extern const struct nla_policy ethnl_linkstate_get_policy[ETHTOOL_A_LINKSTATE_HEADER + 1];
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extern const struct nla_policy ethnl_debug_get_policy[ETHTOOL_A_DEBUG_HEADER + 1];
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extern const struct nla_policy ethnl_debug_set_policy[ETHTOOL_A_DEBUG_MSGMASK + 1];
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extern const struct nla_policy ethnl_wol_get_policy[ETHTOOL_A_WOL_HEADER + 1];
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extern const struct nla_policy ethnl_wol_set_policy[ETHTOOL_A_WOL_SOPASS + 1];
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extern const struct nla_policy ethnl_features_get_policy[ETHTOOL_A_FEATURES_HEADER + 1];
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extern const struct nla_policy ethnl_features_set_policy[ETHTOOL_A_FEATURES_WANTED + 1];
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extern const struct nla_policy ethnl_privflags_get_policy[ETHTOOL_A_PRIVFLAGS_HEADER + 1];
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extern const struct nla_policy ethnl_privflags_set_policy[ETHTOOL_A_PRIVFLAGS_FLAGS + 1];
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extern const struct nla_policy ethnl_rings_get_policy[ETHTOOL_A_RINGS_HEADER + 1];
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extern const struct nla_policy ethnl_rings_set_policy[ETHTOOL_A_RINGS_RX_PUSH + 1];
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extern const struct nla_policy ethnl_channels_get_policy[ETHTOOL_A_CHANNELS_HEADER + 1];
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extern const struct nla_policy ethnl_channels_set_policy[ETHTOOL_A_CHANNELS_COMBINED_COUNT + 1];
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extern const struct nla_policy ethnl_coalesce_get_policy[ETHTOOL_A_COALESCE_HEADER + 1];
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extern const struct nla_policy ethnl_coalesce_set_policy[ETHTOOL_A_COALESCE_MAX + 1];
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extern const struct nla_policy ethnl_pause_get_policy[ETHTOOL_A_PAUSE_STATS_SRC + 1];
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extern const struct nla_policy ethnl_pause_set_policy[ETHTOOL_A_PAUSE_TX + 1];
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extern const struct nla_policy ethnl_eee_get_policy[ETHTOOL_A_EEE_HEADER + 1];
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extern const struct nla_policy ethnl_eee_set_policy[ETHTOOL_A_EEE_TX_LPI_TIMER + 1];
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extern const struct nla_policy ethnl_tsinfo_get_policy[ETHTOOL_A_TSINFO_HEADER + 1];
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extern const struct nla_policy ethnl_cable_test_act_policy[ETHTOOL_A_CABLE_TEST_HEADER + 1];
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extern const struct nla_policy ethnl_cable_test_tdr_act_policy[ETHTOOL_A_CABLE_TEST_TDR_CFG + 1];
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extern const struct nla_policy ethnl_tunnel_info_get_policy[ETHTOOL_A_TUNNEL_INFO_HEADER + 1];
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extern const struct nla_policy ethnl_fec_get_policy[ETHTOOL_A_FEC_HEADER + 1];
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extern const struct nla_policy ethnl_fec_set_policy[ETHTOOL_A_FEC_AUTO + 1];
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extern const struct nla_policy ethnl_module_eeprom_get_policy[ETHTOOL_A_MODULE_EEPROM_I2C_ADDRESS + 1];
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extern const struct nla_policy ethnl_stats_get_policy[ETHTOOL_A_STATS_SRC + 1];
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extern const struct nla_policy ethnl_phc_vclocks_get_policy[ETHTOOL_A_PHC_VCLOCKS_HEADER + 1];
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extern const struct nla_policy ethnl_module_get_policy[ETHTOOL_A_MODULE_HEADER + 1];
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extern const struct nla_policy ethnl_module_set_policy[ETHTOOL_A_MODULE_POWER_MODE_POLICY + 1];
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extern const struct nla_policy ethnl_pse_get_policy[ETHTOOL_A_PSE_HEADER + 1];
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extern const struct nla_policy ethnl_pse_set_policy[ETHTOOL_A_PSE_MAX + 1];
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extern const struct nla_policy ethnl_rss_get_policy[ETHTOOL_A_RSS_CONTEXT + 1];
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extern const struct nla_policy ethnl_plca_get_cfg_policy[ETHTOOL_A_PLCA_HEADER + 1];
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extern const struct nla_policy ethnl_plca_set_cfg_policy[ETHTOOL_A_PLCA_MAX + 1];
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extern const struct nla_policy ethnl_plca_get_status_policy[ETHTOOL_A_PLCA_HEADER + 1];
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extern const struct nla_policy ethnl_mm_get_policy[ETHTOOL_A_MM_HEADER + 1];
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extern const struct nla_policy ethnl_mm_set_policy[ETHTOOL_A_MM_MAX + 1];
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int ethnl_set_features(struct sk_buff *skb, struct genl_info *info);
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int ethnl_act_cable_test(struct sk_buff *skb, struct genl_info *info);
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int ethnl_act_cable_test_tdr(struct sk_buff *skb, struct genl_info *info);
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int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info);
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int ethnl_tunnel_info_start(struct netlink_callback *cb);
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int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb);
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extern const char stats_std_names[__ETHTOOL_STATS_CNT][ETH_GSTRING_LEN];
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extern const char stats_eth_phy_names[__ETHTOOL_A_STATS_ETH_PHY_CNT][ETH_GSTRING_LEN];
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extern const char stats_eth_mac_names[__ETHTOOL_A_STATS_ETH_MAC_CNT][ETH_GSTRING_LEN];
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extern const char stats_eth_ctrl_names[__ETHTOOL_A_STATS_ETH_CTRL_CNT][ETH_GSTRING_LEN];
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extern const char stats_rmon_names[__ETHTOOL_A_STATS_RMON_CNT][ETH_GSTRING_LEN];
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#endif /* _NET_ETHTOOL_NETLINK_H */
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