Similar to #20739 where we implement cgroup attachments using bpf_link, the same can now be done for XDP using https://pkg.go.dev/github.com/cilium/ebpf/link#AttachXDP.

We can pin XDP links to /sys/fs/bpf/cilium/xdp/<ifname>. Cilium 1.14 and 1.13 need to be taught to remove a file at this location before attempting to attach XDP programs using netlink.