bpf_peers_present_if
if (bpf_peers_present_if(ifp)) {
if (bpf_peers_present_if(ifp)) {
has_bpf = bpf_peers_present_if(ifp);
if (bpf_peers_present_if(ifp)) {
if (bpf_peers_present_if(ifp)) {
bool bpf_peers_present_if(struct ifnet *);