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This patch add a xdp program on egress to show that we can modify the packet on egress. In this sample we will set the pkt's src mac to egress's mac address. The xdp_prog will be attached when -X option supplied. Signed-off-by: Hangbin Liu <liuhangbin@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Link: https://lore.kernel.org/bpf/20210122025007.2968381-1-liuhangbin@gmail.com