/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NET_NETLINK_H
#define __NET_NETLINK_H
#include <linux/types.h>
#include <linux/netlink.h>
#include <linux/jiffies.h>
#include <linux/in6.h>
/* ========================================================================
* Netlink Messages and Attributes Interface ( As Seen On TV )
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
* Messages Interface
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*
* Message Format :
* < - - - nlmsg_total_size ( payload ) - - - >
* < - - nlmsg_msg_size ( payload ) - >
* + - - - - - - - - - - + - - - + - - - - - - - - - - - - - + - - - + - - - - - - - - - -
* | nlmsghdr | Pad | Payload | Pad | nlmsghdr
* + - - - - - - - - - - + - - - + - - - - - - - - - - - - - + - - - + - - - - - - - - - -
* nlmsg_data ( nlh ) - - - ^ ^
* nlmsg_next ( nlh ) - - - - - - - - - - - - - - - - - - - - - - - +
*
* Payload Format :
* < - - - - - - - - - - - - - - - - - - - - - - nlmsg_len ( nlh ) - - - - - - - - - - - - - - - - - - - - - >
* < - - - - - - hdrlen - - - - - - > < - nlmsg_attrlen ( nlh , hdrlen ) - >
* + - - - - - - - - - - - - - - - - - - - - - - + - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
* | Family Header | Pad | Attributes |
* + - - - - - - - - - - - - - - - - - - - - - - + - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
* nlmsg_attrdata ( nlh , hdrlen ) - - - ^
*
* Data Structures :
* struct nlmsghdr netlink message header
*
* Message Construction :
* nlmsg_new ( ) create a new netlink message
* nlmsg_put ( ) add a netlink message to an skb
* nlmsg_put_answer ( ) callback based nlmsg_put ( )
* nlmsg_end ( ) finalize netlink message
* nlmsg_get_pos ( ) return current position in message
* nlmsg_trim ( ) trim part of message
* nlmsg_cancel ( ) cancel message construction
* nlmsg_consume ( ) free a netlink message ( expected )
* nlmsg_free ( ) free a netlink message ( drop )
*
* Message Sending :
* nlmsg_multicast ( ) multicast message to several groups
* nlmsg_unicast ( ) unicast a message to a single socket
* nlmsg_notify ( ) send notification message
*
* Message Length Calculations :
* nlmsg_msg_size ( payload ) length of message w / o padding
* nlmsg_total_size ( payload ) length of message w / padding
* nlmsg_padlen ( payload ) length of padding at tail
*
* Message Payload Access :
* nlmsg_data ( nlh ) head of message payload
* nlmsg_len ( nlh ) length of message payload
* nlmsg_attrdata ( nlh , hdrlen ) head of attributes data
* nlmsg_attrlen ( nlh , hdrlen ) length of attributes data
*
* Message Parsing :
* nlmsg_ok ( nlh , remaining ) does nlh fit into remaining bytes ?
* nlmsg_next ( nlh , remaining ) get next netlink message
* nlmsg_parse ( ) parse attributes of a message
* nlmsg_find_attr ( ) find an attribute in a message
* nlmsg_for_each_msg ( ) loop over all messages
* nlmsg_validate ( ) validate netlink message incl . attrs
* nlmsg_for_each_attr ( ) loop over all attributes
* nlmsg_for_each_attr_type ( ) loop over all attributes with the
* given type
*
* Misc :
* nlmsg_report ( ) report back to application ?
*
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
* Attributes Interface
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*
* Attribute Format :
* < - - - - - - - nla_total_size ( payload ) - - - - - - - >
* < - - - - nla_attr_size ( payload ) - - - - - >
* + - - - - - - - - - - + - - - + - - - - - - - - - + - - - + - - - - - - - - - -
* | Header | Pad | Payload | Pad | Header
* + - - - - - - - - - - + - - - + - - - - - - - - - + - - - + - - - - - - - - - -
* < - nla_len ( nla ) - > ^
* nla_data ( nla ) - - - - ^ |
* nla_next ( nla ) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - '
*
* Data Structures :
* struct nlattr netlink attribute header
*
* Attribute Construction :
* nla_reserve ( skb , type , len ) reserve room for an attribute
* nla_reserve_nohdr ( skb , len ) reserve room for an attribute w / o hdr
* nla_put ( skb , type , len , data ) add attribute to skb
* nla_put_nohdr ( skb , len , data ) add attribute w / o hdr
* nla_append ( skb , len , data ) append data to skb
*
* Attribute Construction for Basic Types :
* nla_put_u8 ( skb , type , value ) add u8 attribute to skb
* nla_put_u16 ( skb , type , value ) add u16 attribute to skb
* nla_put_u32 ( skb , type , value ) add u32 attribute to skb
* nla_put_u64_64bit ( skb , type ,
* value , padattr ) add u64 attribute to skb
* nla_put_s8 ( skb , type , value ) add s8 attribute to skb
* nla_put_s16 ( skb , type , value ) add s16 attribute to skb
* nla_put_s32 ( skb , type , value ) add s32 attribute to skb
* nla_put_s64 ( skb , type , value ,
* padattr ) add s64 attribute to skb
* nla_put_string ( skb , type , str ) add string attribute to skb
* nla_put_flag ( skb , type ) add flag attribute to skb
* nla_put_msecs ( skb , type , jiffies ,
* padattr ) add msecs attribute to skb
* nla_put_in_addr ( skb , type , addr ) add IPv4 address attribute to skb
* nla_put_in6_addr ( skb , type , addr ) add IPv6 address attribute to skb
*
* Nested Attributes Construction :
* nla_nest_start ( skb , type ) start a nested attribute
* nla_nest_end ( skb , nla ) finalize a nested attribute
* nla_nest_cancel ( skb , nla ) cancel nested attribute construction
* nla_put_empty_nest ( skb , type ) create an empty nest
*
* Attribute Length Calculations :
* nla_attr_size ( payload ) length of attribute w / o padding
* nla_total_size ( payload ) length of attribute w / padding
* nla_padlen ( payload ) length of padding
*
* Attribute Payload Access :
* nla_data ( nla ) head of attribute payload
* nla_len ( nla ) length of attribute payload
*
* Attribute Payload Access for Basic Types :
* nla_get_uint ( nla ) get payload for a uint attribute
* nla_get_sint ( nla ) get payload for a sint attribute
* nla_get_u8 ( nla ) get payload for a u8 attribute
* nla_get_u16 ( nla ) get payload for a u16 attribute
* nla_get_u32 ( nla ) get payload for a u32 attribute
* nla_get_u64 ( nla ) get payload for a u64 attribute
* nla_get_s8 ( nla ) get payload for a s8 attribute
* nla_get_s16 ( nla ) get payload for a s16 attribute
* nla_get_s32 ( nla ) get payload for a s32 attribute
* nla_get_s64 ( nla ) get payload for a s64 attribute
* nla_get_flag ( nla ) return 1 if flag is true
* nla_get_msecs ( nla ) get payload for a msecs attribute
*
* The same functions also exist with _ default ( ) .
*
* Attribute Misc :
* nla_memcpy ( dest , nla , count ) copy attribute into memory
* nla_memcmp ( nla , data , size ) compare attribute with memory area
* nla_strscpy ( dst , nla , size ) copy attribute to a sized string
* nla_strcmp ( nla , str ) compare attribute with string
*
* Attribute Parsing :
* nla_ok ( nla , remaining ) does nla fit into remaining bytes ?
* nla_next ( nla , remaining ) get next netlink attribute
* nla_validate ( ) validate a stream of attributes
* nla_validate_nested ( ) validate a stream of nested attributes
* nla_find ( ) find attribute in stream of attributes
* nla_find_nested ( ) find attribute in nested attributes
* nla_parse ( ) parse and validate stream of attrs
* nla_parse_nested ( ) parse nested attributes
* nla_for_each_attr ( ) loop over all attributes
* nla_for_each_attr_type ( ) loop over all attributes with the
* given type
* nla_for_each_nested ( ) loop over the nested attributes
* nla_for_each_nested_type ( ) loop over the nested attributes with
* the given type
* = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
*/
/**
* Standard attribute types to specify validation policy
*/
enum {
NLA_UNSPEC,
NLA_U8,
NLA_U16,
NLA_U32,
NLA_U64,
NLA_STRING,
NLA_FLAG,
NLA_MSECS,
NLA_NESTED,
NLA_NESTED_ARRAY,
NLA_NUL_STRING,
NLA_BINARY,
NLA_S8,
NLA_S16,
NLA_S32,
NLA_S64,
NLA_BITFIELD32,
NLA_REJECT,
NLA_BE16,
NLA_BE32,
NLA_SINT,
NLA_UINT,
__NLA_TYPE_MAX,
};
#define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1 )
struct netlink_range_validation {
u64 min, max;
};
struct netlink_range_validation_signed {
s64 min, max;
};
enum nla_policy_validation {
NLA_VALIDATE_NONE,
NLA_VALIDATE_RANGE,
NLA_VALIDATE_RANGE_WARN_TOO_LONG,
NLA_VALIDATE_MIN,
NLA_VALIDATE_MAX,
NLA_VALIDATE_MASK,
NLA_VALIDATE_RANGE_PTR,
NLA_VALIDATE_FUNCTION,
};
/**
* struct nla_policy - attribute validation policy
* @ type : Type of attribute or NLA_UNSPEC
* @ validation_type : type of attribute validation done in addition to
* type - specific validation ( e . g . range , function call ) , see
* & enum nla_policy_validation
* @ len : Type specific length of payload
*
* Policies are defined as arrays of this struct , the array must be
* accessible by attribute type up to the highest identifier to be expected .
*
* Meaning of ` len ' field :
* NLA_STRING Maximum length of string
* NLA_NUL_STRING Maximum length of string ( excluding NUL )
* NLA_FLAG Unused
* NLA_BINARY Maximum length of attribute payload
* ( but see also below with the validation type )
* NLA_NESTED ,
* NLA_NESTED_ARRAY Length verification is done by checking len of
* nested header ( or empty ) ; len field is used if
* nested_policy is also used , for the max attr
* number in the nested policy .
* NLA_SINT , NLA_UINT ,
* NLA_U8 , NLA_U16 ,
* NLA_U32 , NLA_U64 ,
* NLA_S8 , NLA_S16 ,
* NLA_S32 , NLA_S64 ,
* NLA_BE16 , NLA_BE32 ,
* NLA_MSECS Leaving the length field zero will verify the
* given type fits , using it verifies minimum length
* just like " All other "
* NLA_BITFIELD32 Unused
* NLA_REJECT Unused
* All other Minimum length of attribute payload
*
* Meaning of validation union :
* NLA_BITFIELD32 This is a 32 - bit bitmap / bitselector attribute and
* ` bitfield32_valid ' is the u32 value of valid flags
* NLA_REJECT This attribute is always rejected and ` reject_message '
* may point to a string to report as the error instead
* of the generic one in extended ACK .
* NLA_NESTED ` nested_policy ' to a nested policy to validate , must
* also set ` len ' to the max attribute number . Use the
* provided NLA_POLICY_NESTED ( ) macro .
* Note that nla_parse ( ) will validate , but of course not
* parse , the nested sub - policies .
* NLA_NESTED_ARRAY ` nested_policy ' points to a nested policy to validate ,
* must also set ` len ' to the max attribute number . Use
* the provided NLA_POLICY_NESTED_ARRAY ( ) macro .
* The difference to NLA_NESTED is the structure :
* NLA_NESTED has the nested attributes directly inside
* while an array has the nested attributes at another
* level down and the attribute types directly in the
* nesting don ' t matter .
* NLA_UINT ,
* NLA_U8 ,
* NLA_U16 ,
* NLA_U32 ,
* NLA_U64 ,
* NLA_BE16 ,
* NLA_BE32 ,
* NLA_SINT ,
* NLA_S8 ,
* NLA_S16 ,
* NLA_S32 ,
* NLA_S64 The ` min ' and ` max ' fields are used depending on the
* validation_type field , if that is min / max / range then
* the min , max or both are used ( respectively ) to check
* the value of the integer attribute .
* Note that in the interest of code simplicity and
* struct size both limits are s16 , so you cannot
* enforce a range that doesn ' t fall within the range
* of s16 - do that using the NLA_POLICY_FULL_RANGE ( )
* or NLA_POLICY_FULL_RANGE_SIGNED ( ) macros instead .
* Use the NLA_POLICY_MIN ( ) , NLA_POLICY_MAX ( ) and
* NLA_POLICY_RANGE ( ) macros .
* NLA_UINT ,
* NLA_U8 ,
* NLA_U16 ,
* NLA_U32 ,
* NLA_U64 If the validation_type field instead is set to
* NLA_VALIDATE_RANGE_PTR , ` range ' must be a pointer
* to a struct netlink_range_validation that indicates
* the min / max values .
* Use NLA_POLICY_FULL_RANGE ( ) .
* NLA_SINT ,
* NLA_S8 ,
* NLA_S16 ,
* NLA_S32 ,
* NLA_S64 If the validation_type field instead is set to
* NLA_VALIDATE_RANGE_PTR , ` range_signed ' must be a
* pointer to a struct netlink_range_validation_signed
* that indicates the min / max values .
* Use NLA_POLICY_FULL_RANGE_SIGNED ( ) .
*
* NLA_BINARY If the validation type is like the ones for integers
* above , then the min / max length ( not value like for
* integers ) of the attribute is enforced .
*
* All other Unused - but note that it ' s a union
*
* Meaning of ` validate ' field , use via NLA_POLICY_VALIDATE_FN :
* NLA_U8 , NLA_U16 ,
* NLA_U32 , NLA_U64 ,
* NLA_S8 , NLA_S16 ,
* NLA_S32 , NLA_S64 ,
* NLA_MSECS ,
* NLA_BINARY Validation function called for the attribute .
*
* All other Unused - but note that it ' s a union
*
* Example :
*
* static const u32 myvalidflags = 0 xff231023 ;
*
* static const struct nla_policy my_policy [ ATTR_MAX + 1 ] = {
* [ ATTR_FOO ] = { . type = NLA_U16 } ,
* [ ATTR_BAR ] = { . type = NLA_STRING , . len = BARSIZ } ,
* [ ATTR_BAZ ] = NLA_POLICY_EXACT_LEN ( sizeof ( struct mystruct ) ) ,
* [ ATTR_GOO ] = NLA_POLICY_BITFIELD32 ( myvalidflags ) ,
* } ;
*/
struct nla_policy {
u8 type;
u8 validation_type;
u16 len;
union {
/**
* @ strict_start_type : first attribute to validate strictly
*
* This entry is special , and used for the attribute at index 0
* only , and specifies special data about the policy , namely it
* specifies the " boundary type " where strict length validation
* starts for any attribute types > = this value , also , strict
* nesting validation starts here .
*
* Additionally , it means that NLA_UNSPEC is actually NLA_REJECT
* for any types > = this , so need to use NLA_POLICY_MIN_LEN ( ) to
* get the previous pure { . len = xyz } behaviour . The advantage
* of this is that types not specified in the policy will be
* rejected .
*
* For completely new families it should be set to 1 so that the
* validation is enforced for all attributes . For existing ones
* it should be set at least when new attributes are added to
* the enum used by the policy , and be set to the new value that
* was added to enforce strict validation from thereon .
*/
u16 strict_start_type;
/* private: use NLA_POLICY_*() to set */
const u32 bitfield32_valid;
const u32 mask;
const char *reject_message;
const struct nla_policy *nested_policy;
const struct netlink_range_validation *range;
const struct netlink_range_validation_signed *range_signed;
struct {
s16 min, max;
};
int (*validate)(const struct nlattr *attr,
struct netlink_ext_ack *extack);
};
};
#define NLA_POLICY_ETH_ADDR NLA_POLICY_EXACT_LEN(ETH_ALEN)
#define NLA_POLICY_ETH_ADDR_COMPAT NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN)
#define _NLA_POLICY_NESTED(maxattr, policy) \
{ .type = NLA_NESTED, .nested_policy = policy, .len = maxattr }
#define _NLA_POLICY_NESTED_ARRAY(maxattr, policy) \
{ .type = NLA_NESTED_ARRAY, .nested_policy = policy, .len = maxattr }
#define NLA_POLICY_NESTED(policy) \
_NLA_POLICY_NESTED(ARRAY_SIZE(policy) - 1 , policy)
#define NLA_POLICY_NESTED_ARRAY(policy) \
_NLA_POLICY_NESTED_ARRAY(ARRAY_SIZE(policy) - 1 , policy)
#define NLA_POLICY_BITFIELD32(valid) \
{ .type = NLA_BITFIELD32, .bitfield32_valid = valid }
#define __NLA_IS_UINT_TYPE(tp) \
(tp == NLA_U8 || tp == NLA_U16 || tp == NLA_U32 || \
tp == NLA_U64 || tp == NLA_UINT || \
tp == NLA_BE16 || tp == NLA_BE32)
#define __NLA_IS_SINT_TYPE(tp) \
(tp == NLA_S8 || tp == NLA_S16 || tp == NLA_S32 || tp == NLA_S64 || \
tp == NLA_SINT)
#define __NLA_ENSURE(condition) BUILD_BUG_ON_ZERO(!(condition))
#define NLA_ENSURE_UINT_TYPE(tp) \
(__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp)) + tp)
#define NLA_ENSURE_UINT_OR_BINARY_TYPE(tp) \
(__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp) || \
tp == NLA_MSECS || \
tp == NLA_BINARY) + tp)
#define NLA_ENSURE_SINT_TYPE(tp) \
(__NLA_ENSURE(__NLA_IS_SINT_TYPE(tp)) + tp)
#define NLA_ENSURE_INT_OR_BINARY_TYPE(tp) \
(__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp) || \
__NLA_IS_SINT_TYPE(tp) || \
tp == NLA_MSECS || \
tp == NLA_BINARY) + tp)
#define NLA_ENSURE_NO_VALIDATION_PTR(tp) \
(__NLA_ENSURE(tp != NLA_BITFIELD32 && \
tp != NLA_REJECT && \
tp != NLA_NESTED && \
tp != NLA_NESTED_ARRAY) + tp)
#define NLA_POLICY_RANGE(tp, _min, _max) { \
.type = NLA_ENSURE_INT_OR_BINARY_TYPE(tp), \
.validation_type = NLA_VALIDATE_RANGE, \
.min = _min, \
.max = _max \
}
#define NLA_POLICY_FULL_RANGE(tp, _range) { \
.type = NLA_ENSURE_UINT_OR_BINARY_TYPE(tp), \
.validation_type = NLA_VALIDATE_RANGE_PTR, \
.range = _range, \
}
#define NLA_POLICY_FULL_RANGE_SIGNED(tp, _range) { \
.type = NLA_ENSURE_SINT_TYPE(tp), \
.validation_type = NLA_VALIDATE_RANGE_PTR, \
.range_signed = _range, \
}
#define NLA_POLICY_MIN(tp, _min) { \
.type = NLA_ENSURE_INT_OR_BINARY_TYPE(tp), \
.validation_type = NLA_VALIDATE_MIN, \
.min = _min, \
}
#define NLA_POLICY_MAX(tp, _max) { \
.type = NLA_ENSURE_INT_OR_BINARY_TYPE(tp), \
.validation_type = NLA_VALIDATE_MAX, \
.max = _max, \
}
#define NLA_POLICY_MASK(tp, _mask) { \
.type = NLA_ENSURE_UINT_TYPE(tp), \
.validation_type = NLA_VALIDATE_MASK, \
.mask = _mask, \
}
#define NLA_POLICY_VALIDATE_FN(tp, fn, ...) { \
.type = NLA_ENSURE_NO_VALIDATION_PTR(tp), \
.validation_type = NLA_VALIDATE_FUNCTION, \
.validate = fn, \
.len = __VA_ARGS__ + 0 , \
}
#define NLA_POLICY_EXACT_LEN(_len) NLA_POLICY_RANGE(NLA_BINARY, _len, _len)
#define NLA_POLICY_EXACT_LEN_WARN(_len) { \
.type = NLA_BINARY, \
.validation_type = NLA_VALIDATE_RANGE_WARN_TOO_LONG, \
.min = _len, \
.max = _len \
}
#define NLA_POLICY_MIN_LEN(_len) NLA_POLICY_MIN(NLA_BINARY, _len)
#define NLA_POLICY_MAX_LEN(_len) NLA_POLICY_MAX(NLA_BINARY, _len)
/**
* struct nl_info - netlink source information
* @ nlh : Netlink message header of original request
* @ nl_net : Network namespace
* @ portid : Netlink PORTID of requesting application
* @ skip_notify : Skip netlink notifications to user space
* @ skip_notify_kernel : Skip selected in - kernel notifications
*/
struct nl_info {
struct nlmsghdr *nlh;
struct net *nl_net;
u32 portid;
u8 skip_notify:1 ,
skip_notify_kernel:1 ;
};
/**
* enum netlink_validation - netlink message / attribute validation levels
* @ NL_VALIDATE_LIBERAL : Old - style " be liberal " validation , not caring about
* extra data at the end of the message , attributes being longer than
* they should be , or unknown attributes being present .
* @ NL_VALIDATE_TRAILING : Reject junk data encountered after attribute parsing .
* @ NL_VALIDATE_MAXTYPE : Reject attributes > max type ; Together with _ TRAILING
* this is equivalent to the old nla_parse_strict ( ) / nlmsg_parse_strict ( ) .
* @ NL_VALIDATE_UNSPEC : Reject attributes with NLA_UNSPEC in the policy .
* This can safely be set by the kernel when the given policy has no
* NLA_UNSPEC anymore , and can thus be used to ensure policy entries
* are enforced going forward .
* @ NL_VALIDATE_STRICT_ATTRS : strict attribute policy parsing ( e . g .
* U8 , U16 , U32 must have exact size , etc . )
* @ NL_VALIDATE_NESTED : Check that NLA_F_NESTED is set for NLA_NESTED ( _ ARRAY )
* and unset for other policies .
*/
enum netlink_validation {
NL_VALIDATE_LIBERAL = 0 ,
NL_VALIDATE_TRAILING = BIT(0 ),
NL_VALIDATE_MAXTYPE = BIT(1 ),
NL_VALIDATE_UNSPEC = BIT(2 ),
NL_VALIDATE_STRICT_ATTRS = BIT(3 ),
NL_VALIDATE_NESTED = BIT(4 ),
};
#define NL_VALIDATE_DEPRECATED_STRICT (NL_VALIDATE_TRAILING |\
NL_VALIDATE_MAXTYPE)
#define NL_VALIDATE_STRICT (NL_VALIDATE_TRAILING |\
NL_VALIDATE_MAXTYPE |\
NL_VALIDATE_UNSPEC |\
NL_VALIDATE_STRICT_ATTRS |\
NL_VALIDATE_NESTED)
int netlink_rcv_skb(struct sk_buff *skb,
int (*cb)(struct sk_buff *, struct nlmsghdr *,
struct netlink_ext_ack *));
int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid,
unsigned int group, int report, gfp_t flags);
int __nla_validate(const struct nlattr *head, int len, int maxtype,
const struct nla_policy *policy, unsigned int validate,
struct netlink_ext_ack *extack);
int __nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head,
int len, const struct nla_policy *policy, unsigned int validate,
struct netlink_ext_ack *extack);
int nla_policy_len(const struct nla_policy *, int );
struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype);
ssize_t nla_strscpy(char *dst, const struct nlattr *nla, size_t dstsize);
char *nla_strdup(const struct nlattr *nla, gfp_t flags);
int nla_memcpy(void *dest, const struct nlattr *src, int count);
int nla_memcmp(const struct nlattr *nla, const void *data, size_t size);
int nla_strcmp(const struct nlattr *nla, const char *str);
struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen);
struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype,
int attrlen, int padattr);
void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen);
struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen);
struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype,
int attrlen, int padattr);
void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen);
void __nla_put(struct sk_buff *skb, int attrtype, int attrlen,
const void *data);
void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen,
const void *data, int padattr);
void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data);
int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data);
int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen,
const void *data, int padattr);
int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data);
int nla_append(struct sk_buff *skb, int attrlen, const void *data);
/**************************************************************************
* Netlink Messages
**************************************************************************/
/**
* nlmsg_msg_size - length of netlink message not including padding
* @ payload : length of message payload
*/
static inline int nlmsg_msg_size(int payload)
{
return NLMSG_HDRLEN + payload;
}
/**
* nlmsg_total_size - length of netlink message including padding
* @ payload : length of message payload
*/
static inline int nlmsg_total_size(int payload)
{
return NLMSG_ALIGN(nlmsg_msg_size(payload));
}
/**
* nlmsg_padlen - length of padding at the message ' s tail
* @ payload : length of message payload
*/
static inline int nlmsg_padlen(int payload)
{
return nlmsg_total_size(payload) - nlmsg_msg_size(payload);
}
/**
* nlmsg_data - head of message payload
* @ nlh : netlink message header
*/
static inline void *nlmsg_data(const struct nlmsghdr *nlh)
{
return (unsigned char *) nlh + NLMSG_HDRLEN;
}
/**
* nlmsg_len - length of message payload
* @ nlh : netlink message header
*/
static inline int nlmsg_len(const struct nlmsghdr *nlh)
{
return nlh->nlmsg_len - NLMSG_HDRLEN;
}
/**
* nlmsg_payload - message payload if the data fits in the len
* @ nlh : netlink message header
* @ len : struct length
*
* Returns : The netlink message payload / data if the length is sufficient ,
* otherwise NULL .
*/
static inline void *nlmsg_payload(const struct nlmsghdr *nlh, size_t len)
{
if (nlh->nlmsg_len < nlmsg_msg_size(len))
return NULL;
return nlmsg_data(nlh);
}
/**
* nlmsg_attrdata - head of attributes data
* @ nlh : netlink message header
* @ hdrlen : length of family specific header
*/
static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh,
int hdrlen)
{
unsigned char *data = nlmsg_data(nlh);
return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen));
}
/**
* nlmsg_attrlen - length of attributes data
* @ nlh : netlink message header
* @ hdrlen : length of family specific header
*/
static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen)
{
return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen);
}
/**
* nlmsg_ok - check if the netlink message fits into the remaining bytes
* @ nlh : netlink message header
* @ remaining : number of bytes remaining in message stream
*/
static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining)
{
return (remaining >= (int ) sizeof (struct nlmsghdr) &&
nlh->nlmsg_len >= sizeof (struct nlmsghdr) &&
nlh->nlmsg_len <= remaining);
}
/**
* nlmsg_next - next netlink message in message stream
* @ nlh : netlink message header
* @ remaining : number of bytes remaining in message stream
*
* Returns : the next netlink message in the message stream and
* decrements remaining by the size of the current message .
*/
static inline struct nlmsghdr *
nlmsg_next(const struct nlmsghdr *nlh, int *remaining)
{
int totlen = NLMSG_ALIGN(nlh->nlmsg_len);
*remaining -= totlen;
return (struct nlmsghdr *) ((unsigned char *) nlh + totlen);
}
/**
* nla_parse - Parse a stream of attributes into a tb buffer
* @ tb : destination array with maxtype + 1 elements
* @ maxtype : maximum attribute type to be expected
* @ head : head of attribute stream
* @ len : length of attribute stream
* @ policy : validation policy
* @ extack : extended ACK pointer
*
* Parses a stream of attributes and stores a pointer to each attribute in
* the tb array accessible via the attribute type . Attributes with a type
* exceeding maxtype will be rejected , policy must be specified , attributes
* will be validated in the strictest way possible .
*
* Returns : 0 on success or a negative error code .
*/
static inline int nla_parse(struct nlattr **tb, int maxtype,
const struct nlattr *head, int len,
const struct nla_policy *policy,
struct netlink_ext_ack *extack)
{
return __nla_parse(tb, maxtype, head, len, policy,
NL_VALIDATE_STRICT, extack);
}
/**
* nla_parse_deprecated - Parse a stream of attributes into a tb buffer
* @ tb : destination array with maxtype + 1 elements
* @ maxtype : maximum attribute type to be expected
* @ head : head of attribute stream
* @ len : length of attribute stream
* @ policy : validation policy
* @ extack : extended ACK pointer
*
* Parses a stream of attributes and stores a pointer to each attribute in
* the tb array accessible via the attribute type . Attributes with a type
* exceeding maxtype will be ignored and attributes from the policy are not
* always strictly validated ( only for new attributes ) .
*
* Returns : 0 on success or a negative error code .
*/
static inline int nla_parse_deprecated(struct nlattr **tb, int maxtype,
const struct nlattr *head, int len,
const struct nla_policy *policy,
struct netlink_ext_ack *extack)
{
return __nla_parse(tb, maxtype, head, len, policy,
NL_VALIDATE_LIBERAL, extack);
}
/**
* nla_parse_deprecated_strict - Parse a stream of attributes into a tb buffer
* @ tb : destination array with maxtype + 1 elements
* @ maxtype : maximum attribute type to be expected
* @ head : head of attribute stream
* @ len : length of attribute stream
* @ policy : validation policy
* @ extack : extended ACK pointer
*
* Parses a stream of attributes and stores a pointer to each attribute in
* the tb array accessible via the attribute type . Attributes with a type
* exceeding maxtype will be rejected as well as trailing data , but the
* policy is not completely strictly validated ( only for new attributes ) .
*
* Returns : 0 on success or a negative error code .
*/
static inline int nla_parse_deprecated_strict(struct nlattr **tb, int maxtype,
const struct nlattr *head,
int len,
const struct nla_policy *policy,
struct netlink_ext_ack *extack)
{
return __nla_parse(tb, maxtype, head, len, policy,
NL_VALIDATE_DEPRECATED_STRICT, extack);
}
/**
* _ _ nlmsg_parse - parse attributes of a netlink message
* @ nlh : netlink message header
* @ hdrlen : length of family specific header
* @ tb : destination array with maxtype + 1 elements
* @ maxtype : maximum attribute type to be expected
* @ policy : validation policy
* @ validate : validation strictness
* @ extack : extended ACK report struct
*
* See nla_parse ( )
*/
static inline int __nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen,
struct nlattr *tb[], int maxtype,
const struct nla_policy *policy,
unsigned int validate,
struct netlink_ext_ack *extack)
{
if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) {
NL_SET_ERR_MSG(extack, "Invalid header length" );
return -EINVAL;
}
return __nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen),
nlmsg_attrlen(nlh, hdrlen), policy, validate,
extack);
}
/**
* nlmsg_parse - parse attributes of a netlink message
* @ nlh : netlink message header
* @ hdrlen : length of family specific header
* @ tb : destination array with maxtype + 1 elements
* @ maxtype : maximum attribute type to be expected
* @ policy : validation policy
* @ extack : extended ACK report struct
*
* See nla_parse ( )
*/
static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen,
struct nlattr *tb[], int maxtype,
const struct nla_policy *policy,
struct netlink_ext_ack *extack)
{
return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy,
NL_VALIDATE_STRICT, extack);
}
/**
* nlmsg_parse_deprecated - parse attributes of a netlink message
* @ nlh : netlink message header
* @ hdrlen : length of family specific header
* @ tb : destination array with maxtype + 1 elements
* @ maxtype : maximum attribute type to be expected
* @ policy : validation policy
* @ extack : extended ACK report struct
*
* See nla_parse_deprecated ( )
*/
static inline int nlmsg_parse_deprecated(const struct nlmsghdr *nlh, int hdrlen,
struct nlattr *tb[], int maxtype,
const struct nla_policy *policy,
struct netlink_ext_ack *extack)
{
return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy,
NL_VALIDATE_LIBERAL, extack);
}
/**
* nlmsg_parse_deprecated_strict - parse attributes of a netlink message
* @ nlh : netlink message header
* @ hdrlen : length of family specific header
* @ tb : destination array with maxtype + 1 elements
* @ maxtype : maximum attribute type to be expected
* @ policy : validation policy
* @ extack : extended ACK report struct
*
* See nla_parse_deprecated_strict ( )
*/
static inline int
nlmsg_parse_deprecated_strict(const struct nlmsghdr *nlh, int hdrlen,
struct nlattr *tb[], int maxtype,
const struct nla_policy *policy,
struct netlink_ext_ack *extack)
{
return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy,
NL_VALIDATE_DEPRECATED_STRICT, extack);
}
/**
* nlmsg_find_attr - find a specific attribute in a netlink message
* @ nlh : netlink message header
* @ hdrlen : length of family specific header
* @ attrtype : type of attribute to look for
*
* Returns : the first attribute which matches the specified type .
*/
static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh,
int hdrlen, int attrtype)
{
return nla_find(nlmsg_attrdata(nlh, hdrlen),
nlmsg_attrlen(nlh, hdrlen), attrtype);
}
/**
* nla_validate_deprecated - Validate a stream of attributes
* @ head : head of attribute stream
* @ len : length of attribute stream
* @ maxtype : maximum attribute type to be expected
* @ policy : validation policy
* @ extack : extended ACK report struct
*
* Validates all attributes in the specified attribute stream against the
* specified policy . Validation is done in liberal mode .
* See documentation of struct nla_policy for more details .
*
* Returns : 0 on success or a negative error code .
*/
static inline int nla_validate_deprecated(const struct nlattr *head, int len,
int maxtype,
const struct nla_policy *policy,
struct netlink_ext_ack *extack)
{
return __nla_validate(head, len, maxtype, policy, NL_VALIDATE_LIBERAL,
extack);
}
/**
* nla_validate - Validate a stream of attributes
* @ head : head of attribute stream
* @ len : length of attribute stream
* @ maxtype : maximum attribute type to be expected
* @ policy : validation policy
* @ extack : extended ACK report struct
*
* Validates all attributes in the specified attribute stream against the
* specified policy . Validation is done in strict mode .
* See documentation of struct nla_policy for more details .
*
* Returns : 0 on success or a negative error code .
*/
static inline int nla_validate(const struct nlattr *head, int len, int maxtype,
const struct nla_policy *policy,
struct netlink_ext_ack *extack)
{
return __nla_validate(head, len, maxtype, policy, NL_VALIDATE_STRICT,
extack);
}
/**
* nlmsg_validate_deprecated - validate a netlink message including attributes
* @ nlh : netlinket message header
* @ hdrlen : length of family specific header
* @ maxtype : maximum attribute type to be expected
* @ policy : validation policy
* @ extack : extended ACK report struct
*/
static inline int nlmsg_validate_deprecated(const struct nlmsghdr *nlh,
int hdrlen, int maxtype,
const struct nla_policy *policy,
struct netlink_ext_ack *extack)
{
if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
return -EINVAL;
return __nla_validate(nlmsg_attrdata(nlh, hdrlen),
nlmsg_attrlen(nlh, hdrlen), maxtype,
policy, NL_VALIDATE_LIBERAL, extack);
}
/**
* nlmsg_report - need to report back to application ?
* @ nlh : netlink message header
*
* Returns : 1 if a report back to the application is requested .
*/
static inline int nlmsg_report(const struct nlmsghdr *nlh)
{
return nlh ? !!(nlh->nlmsg_flags & NLM_F_ECHO) : 0 ;
}
/**
* nlmsg_seq - return the seq number of netlink message
* @ nlh : netlink message header
*
* Returns : 0 if netlink message is NULL
*/
static inline u32 nlmsg_seq(const struct nlmsghdr *nlh)
{
return nlh ? nlh->nlmsg_seq : 0 ;
}
/**
* nlmsg_for_each_attr - iterate over a stream of attributes
* @ pos : loop counter , set to current attribute
* @ nlh : netlink message header
* @ hdrlen : length of family specific header
* @ rem : initialized to len , holds bytes currently remaining in stream
*/
#define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \
nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \
nlmsg_attrlen(nlh, hdrlen), rem)
/**
* nlmsg_for_each_attr_type - iterate over a stream of attributes
* @ pos : loop counter , set to the current attribute
* @ type : required attribute type for @ pos
* @ nlh : netlink message header
* @ hdrlen : length of the family specific header
* @ rem : initialized to len , holds bytes currently remaining in stream
*/
#define nlmsg_for_each_attr_type(pos, type, nlh, hdrlen, rem) \
nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \
if (nla_type(pos) == type)
/**
* nlmsg_put - Add a new netlink message to an skb
* @ skb : socket buffer to store message in
* @ portid : netlink PORTID of requesting application
* @ seq : sequence number of message
* @ type : message type
* @ payload : length of message payload
* @ flags : message flags
*
* Returns : NULL if the tailroom of the skb is insufficient to store
* the message header and payload .
*/
static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
int type, int payload, int flags)
{
if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload)))
return NULL;
return __nlmsg_put(skb, portid, seq, type, payload, flags);
}
/**
* nlmsg_append - Add more data to a nlmsg in a skb
* @ skb : socket buffer to store message in
* @ size : length of message payload
*
* Append data to an existing nlmsg , used when constructing a message
* with multiple fixed - format headers ( which is rare ) .
* Returns : NULL if the tailroom of the skb is insufficient to store
* the extra payload .
*/
static inline void *nlmsg_append(struct sk_buff *skb, u32 size)
{
if (unlikely(skb_tailroom(skb) < NLMSG_ALIGN(size)))
return NULL;
if (NLMSG_ALIGN(size) - size)
memset(skb_tail_pointer(skb) + size, 0 ,
NLMSG_ALIGN(size) - size);
return __skb_put(skb, NLMSG_ALIGN(size));
}
/**
* nlmsg_put_answer - Add a new callback based netlink message to an skb
* @ skb : socket buffer to store message in
* @ cb : netlink callback
* @ type : message type
* @ payload : length of message payload
* @ flags : message flags
*
* Returns : NULL if the tailroom of the skb is insufficient to store
* the message header and payload .
*/
static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb,
struct netlink_callback *cb,
int type, int payload,
int flags)
{
return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
type, payload, flags);
}
/**
* nlmsg_new - Allocate a new netlink message
* @ payload : size of the message payload
* @ flags : the type of memory to allocate .
*
* Use NLMSG_DEFAULT_SIZE if the size of the payload isn ' t known
* and a good default is needed .
*/
static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags)
{
return alloc_skb(nlmsg_total_size(payload), flags);
}
/**
* nlmsg_new_large - Allocate a new netlink message with non - contiguous
* physical memory
* @ payload : size of the message payload
*
* The allocated skb is unable to have frag page for shinfo - > frags * ,
* as the NULL setting for skb - > head in netlink_skb_destructor ( ) will
* bypass most of the handling in skb_release_data ( )
*/
static inline struct sk_buff *nlmsg_new_large(size_t payload)
{
return netlink_alloc_large_skb(nlmsg_total_size(payload), 0 );
}
/**
* nlmsg_end - Finalize a netlink message
* @ skb : socket buffer the message is stored in
* @ nlh : netlink message header
*
* Corrects the netlink message header to include the appended
* attributes . Only necessary if attributes have been added to
* the message .
*/
static inline void nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh)
{
nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
}
/**
* nlmsg_get_pos - return current position in netlink message
* @ skb : socket buffer the message is stored in
*
* Returns : a pointer to the current tail of the message .
*/
static inline void *nlmsg_get_pos(struct sk_buff *skb)
{
return skb_tail_pointer(skb);
}
/**
* nlmsg_trim - Trim message to a mark
* @ skb : socket buffer the message is stored in
* @ mark : mark to trim to
*
* Trims the message to the provided mark .
*/
static inline void nlmsg_trim(struct sk_buff *skb, const void *mark)
{
if (mark) {
WARN_ON((unsigned char *) mark < skb->data);
skb_trim(skb, (unsigned char *) mark - skb->data);
}
}
/**
* nlmsg_cancel - Cancel construction of a netlink message
* @ skb : socket buffer the message is stored in
* @ nlh : netlink message header
*
* Removes the complete netlink message including all
* attributes from the socket buffer again .
*/
static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh)
{
nlmsg_trim(skb, nlh);
}
/**
* nlmsg_free - drop a netlink message
* @ skb : socket buffer of netlink message
*/
static inline void nlmsg_free(struct sk_buff *skb)
{
kfree_skb(skb);
}
/**
* nlmsg_consume - free a netlink message
* @ skb : socket buffer of netlink message
*/
static inline void nlmsg_consume(struct sk_buff *skb)
{
consume_skb(skb);
}
/**
* nlmsg_multicast_filtered - multicast a netlink message with filter function
* @ sk : netlink socket to spread messages to
* @ skb : netlink message as socket buffer
* @ portid : own netlink portid to avoid sending to yourself
* @ group : multicast group id
* @ flags : allocation flags
* @ filter : filter function
* @ filter_data : filter function private data
*
* Return : 0 on success , negative error code for failure .
*/
static inline int nlmsg_multicast_filtered(struct sock *sk, struct sk_buff *skb,
u32 portid, unsigned int group,
gfp_t flags,
netlink_filter_fn filter,
void *filter_data)
{
int err;
NETLINK_CB(skb).dst_group = group;
err = netlink_broadcast_filtered(sk, skb, portid, group, flags,
filter, filter_data);
if (err > 0 )
err = 0 ;
return err;
}
/**
* nlmsg_multicast - multicast a netlink message
* @ sk : netlink socket to spread messages to
* @ skb : netlink message as socket buffer
* @ portid : own netlink portid to avoid sending to yourself
* @ group : multicast group id
* @ flags : allocation flags
*/
static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb,
u32 portid, unsigned int group, gfp_t flags)
{
return nlmsg_multicast_filtered(sk, skb, portid, group, flags,
NULL, NULL);
}
/**
* nlmsg_unicast - unicast a netlink message
* @ sk : netlink socket to spread message to
* @ skb : netlink message as socket buffer
* @ portid : netlink portid of the destination socket
*/
static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 portid)
{
int err;
err = netlink_unicast(sk, skb, portid, MSG_DONTWAIT);
if (err > 0 )
err = 0 ;
return err;
}
/**
* nlmsg_for_each_msg - iterate over a stream of messages
* @ pos : loop counter , set to current message
* @ head : head of message stream
* @ len : length of message stream
* @ rem : initialized to len , holds bytes currently remaining in stream
*/
#define nlmsg_for_each_msg(pos, head, len, rem) \
for (pos = head, rem = len; \
nlmsg_ok(pos, rem); \
pos = nlmsg_next(pos, &(rem)))
/**
* nl_dump_check_consistent - check if sequence is consistent and advertise if not
* @ cb : netlink callback structure that stores the sequence number
* @ nlh : netlink message header to write the flag to
*
* This function checks if the sequence ( generation ) number changed during dump
* and if it did , advertises it in the netlink message header .
*
* The correct way to use it is to set cb - > seq to the generation counter when
* all locks for dumping have been acquired , and then call this function for
* each message that is generated .
*
* Note that due to initialisation concerns , 0 is an invalid sequence number
* and must not be used by code that uses this functionality .
*/
static inline void
nl_dump_check_consistent(struct netlink_callback *cb,
struct nlmsghdr *nlh)
{
if (cb->prev_seq && cb->seq != cb->prev_seq)
nlh->nlmsg_flags |= NLM_F_DUMP_INTR;
cb->prev_seq = cb->seq;
}
/**************************************************************************
* Netlink Attributes
**************************************************************************/
/**
* nla_attr_size - length of attribute not including padding
* @ payload : length of payload
*/
static inline int nla_attr_size(int payload)
{
return NLA_HDRLEN + payload;
}
/**
* nla_total_size - total length of attribute including padding
* @ payload : length of payload
*/
static inline int nla_total_size(int payload)
{
return NLA_ALIGN(nla_attr_size(payload));
}
/**
* nla_padlen - length of padding at the tail of attribute
* @ payload : length of payload
*/
static inline int nla_padlen(int payload)
{
return nla_total_size(payload) - nla_attr_size(payload);
}
/**
* nla_type - attribute type
* @ nla : netlink attribute
*/
static inline int nla_type(const struct nlattr *nla)
{
return nla->nla_type & NLA_TYPE_MASK;
}
/**
* nla_data - head of payload
* @ nla : netlink attribute
*/
static inline void *nla_data(const struct nlattr *nla)
{
return (char *) nla + NLA_HDRLEN;
}
/**
* nla_len - length of payload
* @ nla : netlink attribute
*/
static inline u16 nla_len(const struct nlattr *nla)
{
return nla->nla_len - NLA_HDRLEN;
}
/**
* nla_ok - check if the netlink attribute fits into the remaining bytes
* @ nla : netlink attribute
* @ remaining : number of bytes remaining in attribute stream
*/
static inline int nla_ok(const struct nlattr *nla, int remaining)
{
return remaining >= (int ) sizeof (*nla) &&
nla->nla_len >= sizeof (*nla) &&
nla->nla_len <= remaining;
}
/**
* nla_next - next netlink attribute in attribute stream
* @ nla : netlink attribute
* @ remaining : number of bytes remaining in attribute stream
*
* Returns : the next netlink attribute in the attribute stream and
* decrements remaining by the size of the current attribute .
*/
static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining)
{
unsigned int totlen = NLA_ALIGN(nla->nla_len);
*remaining -= totlen;
return (struct nlattr *) ((char *) nla + totlen);
}
/**
* nla_find_nested - find attribute in a set of nested attributes
* @ nla : attribute containing the nested attributes
* @ attrtype : type of attribute to look for
*
* Returns : the first attribute which matches the specified type .
*/
static inline struct nlattr *
nla_find_nested(const struct nlattr *nla, int attrtype)
{
return nla_find(nla_data(nla), nla_len(nla), attrtype);
}
/**
* nla_parse_nested - parse nested attributes
* @ tb : destination array with maxtype + 1 elements
* @ maxtype : maximum attribute type to be expected
* @ nla : attribute containing the nested attributes
* @ policy : validation policy
* @ extack : extended ACK report struct
*
* See nla_parse ( )
*/
static inline int nla_parse_nested(struct nlattr *tb[], int maxtype,
const struct nlattr *nla,
const struct nla_policy *policy,
struct netlink_ext_ack *extack)
{
if (!(nla->nla_type & NLA_F_NESTED)) {
NL_SET_ERR_MSG_ATTR(extack, nla, "NLA_F_NESTED is missing" );
return -EINVAL;
}
return __nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy,
NL_VALIDATE_STRICT, extack);
}
/**
* nla_parse_nested_deprecated - parse nested attributes
* @ tb : destination array with maxtype + 1 elements
* @ maxtype : maximum attribute type to be expected
* @ nla : attribute containing the nested attributes
* @ policy : validation policy
* @ extack : extended ACK report struct
*
* See nla_parse_deprecated ( )
*/
static inline int nla_parse_nested_deprecated(struct nlattr *tb[], int maxtype,
const struct nlattr *nla,
const struct nla_policy *policy,
struct netlink_ext_ack *extack)
{
return __nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy,
NL_VALIDATE_LIBERAL, extack);
}
/**
* nla_put_u8 - Add a u8 netlink attribute to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
*/
static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value)
{
/* temporary variables to work around GCC PR81715 with asan-stack=1 */
u8 tmp = value;
return nla_put(skb, attrtype, sizeof (u8), &tmp);
}
/**
* nla_put_u16 - Add a u16 netlink attribute to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
*/
static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value)
{
u16 tmp = value;
return nla_put(skb, attrtype, sizeof (u16), &tmp);
}
/**
* nla_put_be16 - Add a _ _ be16 netlink attribute to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
*/
static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value)
{
__be16 tmp = value;
return nla_put(skb, attrtype, sizeof (__be16), &tmp);
}
/**
* nla_put_net16 - Add 16 - bit network byte order netlink attribute to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
*/
static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value)
{
__be16 tmp = value;
return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, tmp);
}
/**
* nla_put_le16 - Add a _ _ le16 netlink attribute to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
*/
static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value)
{
__le16 tmp = value;
return nla_put(skb, attrtype, sizeof (__le16), &tmp);
}
/**
* nla_put_u32 - Add a u32 netlink attribute to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
*/
static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value)
{
u32 tmp = value;
return nla_put(skb, attrtype, sizeof (u32), &tmp);
}
/**
* nla_put_uint - Add a variable - size unsigned int to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
*/
static inline int nla_put_uint(struct sk_buff *skb, int attrtype, u64 value)
{
u64 tmp64 = value;
u32 tmp32 = value;
if (tmp64 == tmp32)
return nla_put_u32(skb, attrtype, tmp32);
return nla_put(skb, attrtype, sizeof (u64), &tmp64);
}
/**
* nla_put_be32 - Add a _ _ be32 netlink attribute to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
*/
static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value)
{
__be32 tmp = value;
return nla_put(skb, attrtype, sizeof (__be32), &tmp);
}
/**
* nla_put_net32 - Add 32 - bit network byte order netlink attribute to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
*/
static inline int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value)
{
__be32 tmp = value;
return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, tmp);
}
/**
* nla_put_le32 - Add a _ _ le32 netlink attribute to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
*/
static inline int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value)
{
__le32 tmp = value;
return nla_put(skb, attrtype, sizeof (__le32), &tmp);
}
/**
* nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
* @ padattr : attribute type for the padding
*/
static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype,
u64 value, int padattr)
{
u64 tmp = value;
return nla_put_64bit(skb, attrtype, sizeof (u64), &tmp, padattr);
}
/**
* nla_put_be64 - Add a _ _ be64 netlink attribute to a socket buffer and align it
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
* @ padattr : attribute type for the padding
*/
static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value,
int padattr)
{
__be64 tmp = value;
return nla_put_64bit(skb, attrtype, sizeof (__be64), &tmp, padattr);
}
/**
* nla_put_net64 - Add 64 - bit network byte order nlattr to a skb and align it
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
* @ padattr : attribute type for the padding
*/
static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value,
int padattr)
{
__be64 tmp = value;
return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, tmp,
padattr);
}
/**
* nla_put_le64 - Add a _ _ le64 netlink attribute to a socket buffer and align it
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
* @ padattr : attribute type for the padding
*/
static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value,
int padattr)
{
__le64 tmp = value;
return nla_put_64bit(skb, attrtype, sizeof (__le64), &tmp, padattr);
}
/**
* nla_put_s8 - Add a s8 netlink attribute to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
*/
static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value)
{
s8 tmp = value;
return nla_put(skb, attrtype, sizeof (s8), &tmp);
}
/**
* nla_put_s16 - Add a s16 netlink attribute to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
*/
static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value)
{
s16 tmp = value;
return nla_put(skb, attrtype, sizeof (s16), &tmp);
}
/**
* nla_put_s32 - Add a s32 netlink attribute to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
*/
static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value)
{
s32 tmp = value;
return nla_put(skb, attrtype, sizeof (s32), &tmp);
}
/**
* nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
* @ padattr : attribute type for the padding
*/
static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value,
int padattr)
{
s64 tmp = value;
return nla_put_64bit(skb, attrtype, sizeof (s64), &tmp, padattr);
}
/**
* nla_put_sint - Add a variable - size signed int to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : numeric value
*/
static inline int nla_put_sint(struct sk_buff *skb, int attrtype, s64 value)
{
s64 tmp64 = value;
s32 tmp32 = value;
if (tmp64 == tmp32)
return nla_put_s32(skb, attrtype, tmp32);
return nla_put(skb, attrtype, sizeof (s64), &tmp64);
}
/**
* nla_put_string - Add a string netlink attribute to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ str : NUL terminated string
*/
static inline int nla_put_string(struct sk_buff *skb, int attrtype,
const char *str)
{
return nla_put(skb, attrtype, strlen(str) + 1 , str);
}
/**
* nla_put_flag - Add a flag netlink attribute to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
*/
static inline int nla_put_flag(struct sk_buff *skb, int attrtype)
{
return nla_put(skb, attrtype, 0 , NULL);
}
/**
* nla_put_msecs - Add a msecs netlink attribute to a skb and align it
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ njiffies : number of jiffies to convert to msecs
* @ padattr : attribute type for the padding
*/
static inline int nla_put_msecs(struct sk_buff *skb, int attrtype,
unsigned long njiffies, int padattr)
{
u64 tmp = jiffies_to_msecs(njiffies);
return nla_put_64bit(skb, attrtype, sizeof (u64), &tmp, padattr);
}
/**
* nla_put_in_addr - Add an IPv4 address netlink attribute to a socket
* buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ addr : IPv4 address
*/
static inline int nla_put_in_addr(struct sk_buff *skb, int attrtype,
__be32 addr)
{
__be32 tmp = addr;
return nla_put_be32(skb, attrtype, tmp);
}
/**
* nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket
* buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ addr : IPv6 address
*/
static inline int nla_put_in6_addr(struct sk_buff *skb, int attrtype,
const struct in6_addr *addr)
{
return nla_put(skb, attrtype, sizeof (*addr), addr);
}
/**
* nla_put_bitfield32 - Add a bitfield32 netlink attribute to a socket buffer
* @ skb : socket buffer to add attribute to
* @ attrtype : attribute type
* @ value : value carrying bits
* @ selector : selector of valid bits
*/
static inline int nla_put_bitfield32(struct sk_buff *skb, int attrtype,
__u32 value, __u32 selector)
{
struct nla_bitfield32 tmp = { value, selector, };
return nla_put(skb, attrtype, sizeof (tmp), &tmp);
}
/**
* nla_get_u32 - return payload of u32 attribute
* @ nla : u32 netlink attribute
*/
static inline u32 nla_get_u32(const struct nlattr *nla)
{
return *(u32 *) nla_data(nla);
}
/**
* nla_get_u32_default - return payload of u32 attribute or default
* @ nla : u32 netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline u32 nla_get_u32_default(const struct nlattr *nla, u32 defvalue)
{
if (!nla)
return defvalue;
return nla_get_u32(nla);
}
/**
* nla_get_be32 - return payload of _ _ be32 attribute
* @ nla : _ _ be32 netlink attribute
*/
static inline __be32 nla_get_be32(const struct nlattr *nla)
{
return *(__be32 *) nla_data(nla);
}
/**
* nla_get_be32_default - return payload of be32 attribute or default
* @ nla : _ _ be32 netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline __be32 nla_get_be32_default(const struct nlattr *nla,
__be32 defvalue)
{
if (!nla)
return defvalue;
return nla_get_be32(nla);
}
/**
* nla_get_le32 - return payload of _ _ le32 attribute
* @ nla : _ _ le32 netlink attribute
*/
static inline __le32 nla_get_le32(const struct nlattr *nla)
{
return *(__le32 *) nla_data(nla);
}
/**
* nla_get_le32_default - return payload of le32 attribute or default
* @ nla : _ _ le32 netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline __le32 nla_get_le32_default(const struct nlattr *nla,
__le32 defvalue)
{
if (!nla)
return defvalue;
return nla_get_le32(nla);
}
/**
* nla_get_u16 - return payload of u16 attribute
* @ nla : u16 netlink attribute
*/
static inline u16 nla_get_u16(const struct nlattr *nla)
{
return *(u16 *) nla_data(nla);
}
/**
* nla_get_u16_default - return payload of u16 attribute or default
* @ nla : u16 netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline u16 nla_get_u16_default(const struct nlattr *nla, u16 defvalue)
{
if (!nla)
return defvalue;
return nla_get_u16(nla);
}
/**
* nla_get_be16 - return payload of _ _ be16 attribute
* @ nla : _ _ be16 netlink attribute
*/
static inline __be16 nla_get_be16(const struct nlattr *nla)
{
return *(__be16 *) nla_data(nla);
}
/**
* nla_get_be16_default - return payload of be16 attribute or default
* @ nla : _ _ be16 netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline __be16 nla_get_be16_default(const struct nlattr *nla,
__be16 defvalue)
{
if (!nla)
return defvalue;
return nla_get_be16(nla);
}
/**
* nla_get_le16 - return payload of _ _ le16 attribute
* @ nla : _ _ le16 netlink attribute
*/
static inline __le16 nla_get_le16(const struct nlattr *nla)
{
return *(__le16 *) nla_data(nla);
}
/**
* nla_get_le16_default - return payload of le16 attribute or default
* @ nla : _ _ le16 netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline __le16 nla_get_le16_default(const struct nlattr *nla,
__le16 defvalue)
{
if (!nla)
return defvalue;
return nla_get_le16(nla);
}
/**
* nla_get_u8 - return payload of u8 attribute
* @ nla : u8 netlink attribute
*/
static inline u8 nla_get_u8(const struct nlattr *nla)
{
return *(u8 *) nla_data(nla);
}
/**
* nla_get_u8_default - return payload of u8 attribute or default
* @ nla : u8 netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline u8 nla_get_u8_default(const struct nlattr *nla, u8 defvalue)
{
if (!nla)
return defvalue;
return nla_get_u8(nla);
}
/**
* nla_get_u64 - return payload of u64 attribute
* @ nla : u64 netlink attribute
*/
static inline u64 nla_get_u64(const struct nlattr *nla)
{
u64 tmp;
nla_memcpy(&tmp, nla, sizeof (tmp));
return tmp;
}
/**
* nla_get_u64_default - return payload of u64 attribute or default
* @ nla : u64 netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline u64 nla_get_u64_default(const struct nlattr *nla, u64 defvalue)
{
if (!nla)
return defvalue;
return nla_get_u64(nla);
}
/**
* nla_get_uint - return payload of uint attribute
* @ nla : uint netlink attribute
*/
static inline u64 nla_get_uint(const struct nlattr *nla)
{
if (nla_len(nla) == sizeof (u32))
return nla_get_u32(nla);
return nla_get_u64(nla);
}
/**
* nla_get_uint_default - return payload of uint attribute or default
* @ nla : uint netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline u64 nla_get_uint_default(const struct nlattr *nla, u64 defvalue)
{
if (!nla)
return defvalue;
return nla_get_uint(nla);
}
/**
* nla_get_be64 - return payload of _ _ be64 attribute
* @ nla : _ _ be64 netlink attribute
*/
static inline __be64 nla_get_be64(const struct nlattr *nla)
{
__be64 tmp;
nla_memcpy(&tmp, nla, sizeof (tmp));
return tmp;
}
/**
* nla_get_be64_default - return payload of be64 attribute or default
* @ nla : _ _ be64 netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline __be64 nla_get_be64_default(const struct nlattr *nla,
__be64 defvalue)
{
if (!nla)
return defvalue;
return nla_get_be64(nla);
}
/**
* nla_get_le64 - return payload of _ _ le64 attribute
* @ nla : _ _ le64 netlink attribute
*/
static inline __le64 nla_get_le64(const struct nlattr *nla)
{
return *(__le64 *) nla_data(nla);
}
/**
* nla_get_le64_default - return payload of le64 attribute or default
* @ nla : _ _ le64 netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline __le64 nla_get_le64_default(const struct nlattr *nla,
__le64 defvalue)
{
if (!nla)
return defvalue;
return nla_get_le64(nla);
}
/**
* nla_get_s32 - return payload of s32 attribute
* @ nla : s32 netlink attribute
*/
static inline s32 nla_get_s32(const struct nlattr *nla)
{
return *(s32 *) nla_data(nla);
}
/**
* nla_get_s32_default - return payload of s32 attribute or default
* @ nla : s32 netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline s32 nla_get_s32_default(const struct nlattr *nla, s32 defvalue)
{
if (!nla)
return defvalue;
return nla_get_s32(nla);
}
/**
* nla_get_s16 - return payload of s16 attribute
* @ nla : s16 netlink attribute
*/
static inline s16 nla_get_s16(const struct nlattr *nla)
{
return *(s16 *) nla_data(nla);
}
/**
* nla_get_s16_default - return payload of s16 attribute or default
* @ nla : s16 netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline s16 nla_get_s16_default(const struct nlattr *nla, s16 defvalue)
{
if (!nla)
return defvalue;
return nla_get_s16(nla);
}
/**
* nla_get_s8 - return payload of s8 attribute
* @ nla : s8 netlink attribute
*/
static inline s8 nla_get_s8(const struct nlattr *nla)
{
return *(s8 *) nla_data(nla);
}
/**
* nla_get_s8_default - return payload of s8 attribute or default
* @ nla : s8 netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline s8 nla_get_s8_default(const struct nlattr *nla, s8 defvalue)
{
if (!nla)
return defvalue;
return nla_get_s8(nla);
}
/**
* nla_get_s64 - return payload of s64 attribute
* @ nla : s64 netlink attribute
*/
static inline s64 nla_get_s64(const struct nlattr *nla)
{
s64 tmp;
nla_memcpy(&tmp, nla, sizeof (tmp));
return tmp;
}
/**
* nla_get_s64_default - return payload of s64 attribute or default
* @ nla : s64 netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline s64 nla_get_s64_default(const struct nlattr *nla, s64 defvalue)
{
if (!nla)
return defvalue;
return nla_get_s64(nla);
}
/**
* nla_get_sint - return payload of uint attribute
* @ nla : uint netlink attribute
*/
static inline s64 nla_get_sint(const struct nlattr *nla)
{
if (nla_len(nla) == sizeof (s32))
return nla_get_s32(nla);
return nla_get_s64(nla);
}
/**
* nla_get_sint_default - return payload of sint attribute or default
* @ nla : sint netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline s64 nla_get_sint_default(const struct nlattr *nla, s64 defvalue)
{
if (!nla)
return defvalue;
return nla_get_sint(nla);
}
/**
* nla_get_flag - return payload of flag attribute
* @ nla : flag netlink attribute
*/
static inline int nla_get_flag(const struct nlattr *nla)
{
return !!nla;
}
/**
* nla_get_msecs - return payload of msecs attribute
* @ nla : msecs netlink attribute
*
* Returns : the number of milliseconds in jiffies .
*/
static inline unsigned long nla_get_msecs(const struct nlattr *nla)
{
u64 msecs = nla_get_u64(nla);
return msecs_to_jiffies((unsigned long ) msecs);
}
/**
* nla_get_msecs_default - return payload of msecs attribute or default
* @ nla : msecs netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline unsigned long nla_get_msecs_default(const struct nlattr *nla,
unsigned long defvalue)
{
if (!nla)
return defvalue;
return nla_get_msecs(nla);
}
/**
* nla_get_in_addr - return payload of IPv4 address attribute
* @ nla : IPv4 address netlink attribute
*/
static inline __be32 nla_get_in_addr(const struct nlattr *nla)
{
return *(__be32 *) nla_data(nla);
}
/**
* nla_get_in_addr_default - return payload of be32 attribute or default
* @ nla : IPv4 address netlink attribute , may be % NULL
* @ defvalue : default value to use if @ nla is % NULL
*
* Return : the value of the attribute , or the default value if not present
*/
static inline __be32 nla_get_in_addr_default(const struct nlattr *nla,
__be32 defvalue)
{
if (!nla)
return defvalue;
return nla_get_in_addr(nla);
}
/**
* nla_get_in6_addr - return payload of IPv6 address attribute
* @ nla : IPv6 address netlink attribute
*/
static inline struct in6_addr nla_get_in6_addr(const struct nlattr *nla)
{
struct in6_addr tmp;
nla_memcpy(&tmp, nla, sizeof (tmp));
return tmp;
}
/**
* nla_get_bitfield32 - return payload of 32 bitfield attribute
* @ nla : nla_bitfield32 attribute
*/
static inline struct nla_bitfield32 nla_get_bitfield32(const struct nlattr *nla)
{
struct nla_bitfield32 tmp;
nla_memcpy(&tmp, nla, sizeof (tmp));
return tmp;
}
/**
* nla_memdup - duplicate attribute memory ( kmemdup )
* @ src : netlink attribute to duplicate from
* @ gfp : GFP mask
*/
static inline void *nla_memdup_noprof(const struct nlattr *src, gfp_t gfp)
{
return kmemdup_noprof(nla_data(src), nla_len(src), gfp);
}
#define nla_memdup(...) alloc_hooks(nla_memdup_noprof(__VA_ARGS__))
/**
* nla_nest_start_noflag - Start a new level of nested attributes
* @ skb : socket buffer to add attributes to
* @ attrtype : attribute type of container
*
* This function exists for backward compatibility to use in APIs which never
* marked their nest attributes with NLA_F_NESTED flag . New APIs should use
* nla_nest_start ( ) which sets the flag .
*
* Returns : the container attribute or NULL on error
*/
static inline struct nlattr *nla_nest_start_noflag(struct sk_buff *skb,
int attrtype)
{
struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb);
if (nla_put(skb, attrtype, 0 , NULL) < 0 )
return NULL;
return start;
}
/**
* nla_nest_start - Start a new level of nested attributes , with NLA_F_NESTED
* @ skb : socket buffer to add attributes to
* @ attrtype : attribute type of container
*
* Unlike nla_nest_start_noflag ( ) , mark the nest attribute with NLA_F_NESTED
* flag . This is the preferred function to use in new code .
*
* Returns : the container attribute or NULL on error
*/
static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype)
{
return nla_nest_start_noflag(skb, attrtype | NLA_F_NESTED);
}
/**
* nla_nest_end - Finalize nesting of attributes
* @ skb : socket buffer the attributes are stored in
* @ start : container attribute
*
* Corrects the container attribute header to include the all
* appended attributes .
*
* Returns : the total data length of the skb .
*/
static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start)
{
start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start;
return skb->len;
}
/**
* nla_nest_cancel - Cancel nesting of attributes
* @ skb : socket buffer the message is stored in
* @ start : container attribute
*
* Removes the container attribute and including all nested
* attributes . Returns - EMSGSIZE
*/
static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start)
{
nlmsg_trim(skb, start);
}
/**
* nla_put_empty_nest - Create an empty nest
* @ skb : socket buffer the message is stored in
* @ attrtype : attribute type of the container
*
* This function is a helper for creating empty nests .
*
* Returns : 0 when successful or - EMSGSIZE on failure .
*/
static inline int nla_put_empty_nest(struct sk_buff *skb, int attrtype)
{
return nla_nest_start(skb, attrtype) ? 0 : -EMSGSIZE;
}
/**
* _ _ nla_validate_nested - Validate a stream of nested attributes
* @ start : container attribute
* @ maxtype : maximum attribute type to be expected
* @ policy : validation policy
* @ validate : validation strictness
* @ extack : extended ACK report struct
*
* Validates all attributes in the nested attribute stream against the
* specified policy . Attributes with a type exceeding maxtype will be
* ignored . See documentation of struct nla_policy for more details .
*
* Returns : 0 on success or a negative error code .
*/
static inline int __nla_validate_nested(const struct nlattr *start, int maxtype,
const struct nla_policy *policy,
unsigned int validate,
struct netlink_ext_ack *extack)
{
return __nla_validate(nla_data(start), nla_len(start), maxtype, policy,
validate, extack);
}
static inline int
nla_validate_nested(const struct nlattr *start, int maxtype,
const struct nla_policy *policy,
struct netlink_ext_ack *extack)
{
return __nla_validate_nested(start, maxtype, policy,
NL_VALIDATE_STRICT, extack);
}
static inline int
nla_validate_nested_deprecated(const struct nlattr *start, int maxtype,
const struct nla_policy *policy,
struct netlink_ext_ack *extack)
{
return __nla_validate_nested(start, maxtype, policy,
NL_VALIDATE_LIBERAL, extack);
}
/**
* nla_need_padding_for_64bit - test 64 - bit alignment of the next attribute
* @ skb : socket buffer the message is stored in
*
* Return : true if padding is needed to align the next attribute ( nla_data ( ) ) to
* a 64 - bit aligned area .
*/
static inline bool nla_need_padding_for_64bit(struct sk_buff *skb)
{
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
/* The nlattr header is 4 bytes in size, that's why we test
* if the skb - > data _ is_ aligned . A NOP attribute , plus
* nlattr header for next attribute , will make nla_data ( )
* 8 - byte aligned .
*/
if (IS_ALIGNED((unsigned long )skb_tail_pointer(skb), 8 ))
return true ;
#endif
return false ;
}
/**
* nla_align_64bit - 64 - bit align the nla_data ( ) of next attribute
* @ skb : socket buffer the message is stored in
* @ padattr : attribute type for the padding
*
* Conditionally emit a padding netlink attribute in order to make
* the next attribute we emit have a 64 - bit aligned nla_data ( ) area .
* This will only be done in architectures which do not have
* CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS defined .
*
* Returns : zero on success or a negative error code .
*/
static inline int nla_align_64bit(struct sk_buff *skb, int padattr)
{
if (nla_need_padding_for_64bit(skb) &&
!nla_reserve(skb, padattr, 0 ))
return -EMSGSIZE;
return 0 ;
}
/**
* nla_total_size_64bit - total length of attribute including padding
* @ payload : length of payload
*/
static inline int nla_total_size_64bit(int payload)
{
return NLA_ALIGN(nla_attr_size(payload))
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
+ NLA_ALIGN(nla_attr_size(0 ))
#endif
;
}
/**
* nla_for_each_attr - iterate over a stream of attributes
* @ pos : loop counter , set to current attribute
* @ head : head of attribute stream
* @ len : length of attribute stream
* @ rem : initialized to len , holds bytes currently remaining in stream
*/
#define nla_for_each_attr(pos, head, len, rem) \
for (pos = head, rem = len; \
nla_ok(pos, rem); \
pos = nla_next(pos, &(rem)))
/**
* nla_for_each_attr_type - iterate over a stream of attributes
* @ pos : loop counter , set to current attribute
* @ type : required attribute type for @ pos
* @ head : head of attribute stream
* @ len : length of attribute stream
* @ rem : initialized to len , holds bytes currently remaining in stream
*/
#define nla_for_each_attr_type(pos, type, head, len, rem) \
nla_for_each_attr(pos, head, len, rem) \
if (nla_type(pos) == type)
/**
* nla_for_each_nested - iterate over nested attributes
* @ pos : loop counter , set to current attribute
* @ nla : attribute containing the nested attributes
* @ rem : initialized to len , holds bytes currently remaining in stream
*/
#define nla_for_each_nested(pos, nla, rem) \
nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem)
/**
* nla_for_each_nested_type - iterate over nested attributes
* @ pos : loop counter , set to current attribute
* @ type : required attribute type for @ pos
* @ nla : attribute containing the nested attributes
* @ rem : initialized to len , holds bytes currently remaining in stream
*/
#define nla_for_each_nested_type(pos, type, nla, rem) \
nla_for_each_nested(pos, nla, rem) \
if (nla_type(pos) == type)
/**
* nla_is_last - Test if attribute is last in stream
* @ nla : attribute to test
* @ rem : bytes remaining in stream
*/
static inline bool nla_is_last(const struct nlattr *nla, int rem)
{
return nla->nla_len == rem;
}
void nla_get_range_unsigned(const struct nla_policy *pt,
struct netlink_range_validation *range);
void nla_get_range_signed(const struct nla_policy *pt,
struct netlink_range_validation_signed *range);
struct netlink_policy_dump_state;
int netlink_policy_dump_add_policy(struct netlink_policy_dump_state **pstate,
const struct nla_policy *policy,
unsigned int maxtype);
int netlink_policy_dump_get_policy_idx(struct netlink_policy_dump_state *state,
const struct nla_policy *policy,
unsigned int maxtype);
bool netlink_policy_dump_loop(struct netlink_policy_dump_state *state);
int netlink_policy_dump_write(struct sk_buff *skb,
struct netlink_policy_dump_state *state);
int netlink_policy_dump_attr_size_estimate(const struct nla_policy *pt);
int netlink_policy_dump_write_attr(struct sk_buff *skb,
const struct nla_policy *pt,
int nestattr);
void netlink_policy_dump_free(struct netlink_policy_dump_state *state);
#endif
Messung V0.5 in Prozent C=95 H=100 G=97
¤ Dauer der Verarbeitung: 0.110 Sekunden
(vorverarbeitet am 2026-09-28)
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