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Check that getsockopt(IP_TOS) returns what setsockopt(IP_TOS) did set right before. Also check that socklen_t == 0 and -1 input values match those of normal tcp sockets. Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>