netfilter: nft_payload: do not update layer 4 checksum when mangling fragments
IP fragments do not come with the transport header, hence skip bogus layer 4 checksum updates. Fixes: 18140969 ("netfilter: nft_payload: layer 4 checksum adjustment for pseudoheader fields") Reported-and-tested-by: Steffen Weinreich <steve@weinreich.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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