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Test that an LWT encapsulation does not silently corrupt XDP metadata sitting in the skb headroom. Exercise all three LWT dispatch paths: - BPF LWT xmit prog reserves headroom on the LWT .xmit redirect, - mpls pushes an MPLS label on the LWT .xmit redirect, - seg6 in encap mode runs on the LWT .input redirect, - ioam6 encap inserts an IOAM Hop-by-Hop option on LWT .output redirect. Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com> Link: https://patch.msgid.link/20260619-bpf-lwt-drop-skb-metadata-v3-2-71d6a33ab76b@cloudflare.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>