362 строки
13 KiB
C
362 строки
13 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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/**
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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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* @attrype: 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_binary() - update binary data from NLA_BINARY atribute
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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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* @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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u32 flags;
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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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static inline int ethnl_ops_begin(struct net_device *dev)
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{
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if (dev && dev->ethtool_ops->begin)
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return dev->ethtool_ops->begin(dev);
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else
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return 0;
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}
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static inline void ethnl_ops_complete(struct net_device *dev)
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{
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if (dev && dev->ethtool_ops->complete)
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dev->ethtool_ops->complete(dev);
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}
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/**
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* struct ethnl_request_ops - unified handling of GET 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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* @max_attr: maximum (top level) attribute type
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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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* @request_policy: netlink policy for message contents
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* @allow_nodev_do: allow non-dump request with no device identification
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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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*
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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 max_attr;
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unsigned int req_info_size;
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unsigned int reply_data_size;
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const struct nla_policy *request_policy;
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bool allow_nodev_do;
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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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};
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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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int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info);
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int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info);
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int ethnl_set_debug(struct sk_buff *skb, struct genl_info *info);
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int ethnl_set_wol(struct sk_buff *skb, struct genl_info *info);
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int ethnl_set_features(struct sk_buff *skb, struct genl_info *info);
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int ethnl_set_privflags(struct sk_buff *skb, struct genl_info *info);
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int ethnl_set_rings(struct sk_buff *skb, struct genl_info *info);
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int ethnl_set_channels(struct sk_buff *skb, struct genl_info *info);
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int ethnl_set_coalesce(struct sk_buff *skb, struct genl_info *info);
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int ethnl_set_pause(struct sk_buff *skb, struct genl_info *info);
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int ethnl_set_eee(struct sk_buff *skb, struct genl_info *info);
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#endif /* _NET_ETHTOOL_NETLINK_H */
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