netfilter: nftables: add helper function to validate set element data

stable inclusion
from stable-v5.10.190
commit 7782ce022fea917ca3fe4fba826c5f4b4c4bc0ec
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I928UI

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=7782ce022fea917ca3fe4fba826c5f4b4c4bc0ec



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[ Upstream commit 97c976d6 ]

When binding sets to rule, validate set element data according to
set definition. This patch adds a helper function to be reused by
the catch-all set element support.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Stable-dep-of: 0a771f7b ("netfilter: nf_tables: skip immediate deactivate in _PREPARE_ERROR")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>