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There is SO_ATTACH_REUSEPORT_[CE]BPF but there is no DETACH. This patch adds SO_DETACH_REUSEPORT_BPF sockopt. The same sockopt can be used to undo both SO_ATTACH_REUSEPORT_[CE]BPF. reseport_detach_prog() is added and it is mostly a mirror of the existing reuseport_attach_prog(). The differences are, it does not call reuseport_alloc() and returns -ENOENT when there is no old prog. Cc: Craig Gallek <[email protected]> Signed-off-by: Martin KaFai Lau <[email protected]> Reviewed-by: Stanislav Fomichev <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]>