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a8a388c2aa
Add a new test script that uses packetdrill tool to exercise conntrack state machine. Needs ip/ip6tables and conntrack tool (to check if we have an entry in the expected state). Test cases added here cover following scenarios: 1. already-acked (retransmitted) packets are not tagged as INVALID 2. RST packet coming when conntrack is already closing (FIN/CLOSE_WAIT) transitions conntrack to CLOSE even if the RST is not an exact match 3. RST packets with out-of-window sequence numbers are marked as INVALID 4. SYN+Challenge ACK: check that challenge ack is allowed to pass 5. Old SYN/ACK: check conntrack handles the case where SYN is answered with SYN/ACK for an old, previous connection attempt 6. Check SYN reception while in ESTABLISHED state generates a challenge ack, RST response clears 'outdated' state + next SYN retransmit gets us into 'SYN_RECV' conntrack state. Tests get run twice, once with ipv4 and once with ipv6. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.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 reStructuredText 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.