opt_proto_t
npfctl_build_proto_block(npf_bpf_t *ctx, const opt_proto_t *op, bool multiple)
const opt_proto_t *op = npfvar_get_data(vars, NPFVAR_PROTO, 0);
const opt_proto_t *op = npfvar_get_data(vars, NPFVAR_PROTO, i);
const opt_proto_t *op = npfvar_get_data(vars, NPFVAR_PROTO, i);
opt_proto_t optproto;