net: IP defrag: encapsulate rbtree defrag code into callable functions
[ Upstream commit c23f35d19db3b36ffb9e04b08f1d91565d15f84f ] This is a refactoring patch: without changing runtime behavior, it moves rbtree-related code from IPv4-specific files/functions into .h/.c defrag files shared with IPv6 defragmentation code. v2: make handling of overlapping packets match upstream. Signed-off-by: NPeter Oskolkov <posk@google.com> Cc: Eric Dumazet <edumazet@google.com> Cc: Florian Westphal <fw@strlen.de> Cc: Tom Herbert <tom@herbertland.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net> Signed-off-by: NSasha Levin <sashal@kernel.org>
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