bpf_mtap_sl_in
.bpf_mtap_sl_in = _bpf_mtap_sl_in,
void (*bpf_mtap_sl_in)(struct bpf_if *, u_char *, struct mbuf **);
bpf_ops->bpf_mtap_sl_in(_ifp->if_bpf, _hdr, _m);
.bpf_mtap_sl_in = (void *)bpf_stub_warn,
bpf_mtap_sl_in(&sc->sc_if, chdr, &m);