bpf_attach
ubus->bpf = bpf_attach(device_get_nameunit(ubus->bdev), DLT_USB,
struct bpf_if * bpf_attach(const char *, u_int, u_int,
ifp->if_bpf = bpf_attach(ifp->if_xname, dlt, hdrlen,
vap->iv_rawbpf = bpf_attach(if_name(vap->iv_ifp),
V_default_tap.bpf = bpf_attach(V_default_tap.name, DLT_EN10MB,
V_bpf_pflog = bpf_attach("ipfwlog0", DLT_PFLOG, PFLOG_HDRLEN,
tap->bpf = bpf_attach(tap->name, DLT_EN10MB, PFLOG_HDRLEN,