[PATCH] attr: add NLA_S8

[Christian Marangi]

On Wed, Mar 15, 2023 at 02:37:43PM +0100, Nick Hainke wrote:
> NLA_S8 is used by newer hostapd versions.
> 
> Signed-off-by: Nick Hainke <vincent at systemli.org>

What is the target project of this patch?

> ---
>  attr.c                 |  1 +
>  include/netlink/attr.h | 35 +++++++++++++++++++++++++++++++++++
>  2 files changed, 36 insertions(+)
> 
> diff --git a/attr.c b/attr.c
> index eae91e5..abde67f 100644
> --- a/attr.c
> +++ b/attr.c
> @@ -437,6 +437,7 @@ static uint16_t nla_attr_minlen[NLA_TYPE_MAX+1] = {
>  	[NLA_U32]	= sizeof(uint32_t),
>  	[NLA_U64]	= sizeof(uint64_t),
>  	[NLA_STRING]	= 1,
> +	[NLA_S8]	= sizeof(int8_t),
>  };
>  
>  static int validate_nla(struct nlattr *nla, int maxtype,
> diff --git a/include/netlink/attr.h b/include/netlink/attr.h
> index 3e3047f..3a5d53d 100644
> --- a/include/netlink/attr.h
> +++ b/include/netlink/attr.h
> @@ -45,6 +45,7 @@ enum {
>  	NLA_FLAG,	/**< Flag */
>  	NLA_MSECS,	/**< Micro seconds (64bit) */
>  	NLA_NESTED,	/**< Nested attributes */
> +	NLA_S8,
>  	__NLA_TYPE_MAX,
>  };
>  
> @@ -248,6 +249,31 @@ static inline int nla_put_addr(struct nl_msg *msg, int attrtype, struct nl_addr
>   * @name Integer Attributes
>   */
>  
> +/**
> + * Add 8 bit signed integer attribute to netlink message.
> + * @arg msg             Netlink message.
> + * @arg attrtype        Attribute type.
> + * @arg value           Numeric value to store as payload.
> + *
> + * @see nla_put
> + * @return 0 on success or a negative error code.
> + */
> +static inline int nla_put_s8(struct nl_msg *msg, int attrtype, int8_t value)
> +{
> +	return nla_put(msg, attrtype, sizeof(int8_t), &value);
> +}
> +
> +/**
> + * Return value of 8 bit signed integer attribute.
> + * @arg nla             8 bit integer attribute
> + *
> + * @return Payload as 8 bit integer.
> + */
> +static inline int8_t nla_get_s8(const struct nlattr *nla)
> +{
> +	return *(const int8_t *) nla_data(nla);
> +}
> +
>  /**
>   * Add 8 bit integer attribute to netlink message.
>   * @arg msg		Netlink message.
> @@ -638,6 +664,15 @@ static inline size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dst
>  		NLA_PUT(msg, attrtype, sizeof(type), &__tmp); \
>  	} while(0)
>  
> +/**
> + * Add 8 bit signed integer attribute to netlink message.
> + * @arg msg		Netlink message.
> + * @arg attrtype	Attribute type.
> + * @arg value		Numeric value.
> + */
> +#define NLA_PUT_S8(msg, attrtype, value) \
> +	NLA_PUT_TYPE(msg, int8_t, attrtype, value)
> +
>  /**
>   * Add 8 bit integer attribute to netlink message.
>   * @arg msg		Netlink message.
> -- 
> 2.40.0
> 
> 
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