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[ Upstream commit 7890cbea66e78a3a6037b2a12827118d7243270b ]
This allows to replace a tcp option with nop padding to selectively disable
a particular tcp option.
Optstrip mode is chosen when userspace passes the exthdr expression with
neither a source nor a destination register attribute.
This is identical to xtables TCPOPTSTRIP extension.
The only difference is that TCPOPTSTRIP allows to pass in a bitmap
of options to remove rather than a single number.
Unlike TCPOPTSTRIP this expression can be used multiple times
in the same rule to get the same effect.
We could add a new nested attribute later on in case there is a
use case for single-expression-multi-remove.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Stable-dep-of: 28427f368f0e ("netfilter: nft_exthdr: Fix non-linear header modification")
Signed-off-by: Sasha Levin <sashal@kernel.org>
7ca3a1b0f4