selftests: netfilter: add selftest for ipip pmtu discovery with enabled connection tracking
Convert Christians bug description into a reproducer. Cc: Shuah Khan <shuah@kernel.org> Reported-by: Christian Perle <christian.perle@secunet.com> Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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