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6e250dcbff
If 'nf_conntrack_tcp_loose' is off (the default), tcp packets that are outside of the current window are marked as INVALID. nf/iptables rulesets often drop such packets via 'ct state invalid' or similar checks. For overly delayed acks, this can be a nuisance if such 'invalid' packets are also logged. Since they are not invalid in a strict sense, just ignore them, i.e. conntrack won't extend timeout or change state so that they do not match invalid state rules anymore. This also avoids unwantend connection stalls in case conntrack considers retransmission (of data that did not reach the peer) as too old. The else branch of the conditional becomes obsolete. Next patch will reformant the now always-true if condition. The existing workaround for data that exceeds the calculated receive window is adjusted to use the 'ignore' state so that these packets do not refresh the timeout or change state other than updating ->td_end. Signed-off-by: Florian Westphal <fw@strlen.de>
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.