netfilter: nft_payload: add optimized payload implementation for small loads
Add an optimized payload expression implementation for small (up to 4 bytes) aligned data loads from the linear packet area. This patch also includes original Patrick McHardy's entitled (nf_tables: inline nft_payload_fast_eval() into main evaluation loop). Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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