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This patch adds two tests using SO_REUSEADDR and SO_REUSEPORT and defines errno for each test case. SO_REUSEADDR/SO_REUSEPORT is set for the per-fixture two bind() calls. The notable pattern is the pair of v6only [::] and plain [::]. The two sockets are put into the same tb2, where per-bucket v6only flag would be useless to detect bind() conflict. Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Link: https://lore.kernel.org/r/20240326204251.51301-9-kuniyu@amazon.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>