netlink: split generic part of netlink_gen_payload_mask into helper

netlink_gen_payload_mask assumes expr is a payload expression,
but most of this function would work fine with exthdr too.

So split the gernic part into a helper, followup patch will
add netlink_gen_exthdr_mask.

Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>

0 files changed, 0 insertions, 0 deletions