Florian Westphal
ed60b8014c
[ Upstream commit7890cbea66] 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:28427f368f("netfilter: nft_exthdr: Fix non-linear header modification") Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.