pub unsafe extern "C" fn bpf_program__attach_netfilter(
prog: *const bpf_program,
opts: *const bpf_netfilter_opts,
) -> *mut bpf_link
pub unsafe extern "C" fn bpf_program__attach_netfilter(
prog: *const bpf_program,
opts: *const bpf_netfilter_opts,
) -> *mut bpf_link