bpf_program__attach_netfilter
bpf_program__attach_netfilter(const struct bpf_program *prog,
skel->links.defrag = bpf_program__attach_netfilter(skel->progs.defrag, &opts);
link2 = bpf_program__attach_netfilter(prog, &opts);
link2 = bpf_program__attach_netfilter(prog, &opts);
link = bpf_program__attach_netfilter(prog, &opts);