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netlink: Add nla_put_empty_nest helper

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Creating empty nests is helpful when the exact attributes to be exposed
in the future are not known. Encapsulate the logic in a helper.

Signed-off-by: Joe Damato <jdamato@fastly.com>
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Link: https://patch.msgid.link/20250214211255.14194-2-jdamato@fastly.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Joe Damato 2025-02-14 21:12:29 +00:00 committed by Jakub Kicinski
parent c935af429e
commit a127c18462
1 changed files with 15 additions and 0 deletions
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15
include/net/netlink.h
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@ -118,6 +118,7 @@
* 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
@ -2240,6 +2241,20 @@ 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