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Test that setsockopt PACKET_IGNORE_OUTGOING: - works with valid values (0 and 1), - rejects values outside of that range, and When enabled for a loopback sniffer, it only produces 1 copy of the packet (rx) instead of two copies (tx and rx). Use sll_pkttype to check the direction of the packet to ensure the correct packet is sniffed. Reviewed-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Joe Damato <joe@dama.to> Link: https://patch.msgid.link/20260728160935.4128982-6-joe@dama.to Signed-off-by: Jakub Kicinski <kuba@kernel.org>