diff --git a/gnss/1.1/default/GnssConfiguration.h b/gnss/1.1/default/GnssConfiguration.h
index 4f7ed2b..9b2699b 100644
--- a/gnss/1.1/default/GnssConfiguration.h
+++ b/gnss/1.1/default/GnssConfiguration.h
@@ -1,9 +1,12 @@
 #ifndef ANDROID_HARDWARE_GNSS_V1_1_GNSSCONFIGURATION_H
 #define ANDROID_HARDWARE_GNSS_V1_1_GNSSCONFIGURATION_H
 
+#include <android/hardware/gnss/1.1/IGnssCallback.h>
 #include <android/hardware/gnss/1.1/IGnssConfiguration.h>
 #include <hidl/MQDescriptor.h>
 #include <hidl/Status.h>
+#include <mutex>
+#include <unordered_set>
 
 namespace android {
 namespace hardware {
@@ -19,6 +22,26 @@
 using ::android::hardware::Void;
 using ::android::sp;
 
+using BlacklistedSource = ::android::hardware::gnss::V1_1::IGnssConfiguration::BlacklistedSource;
+using GnssConstellationType = V1_0::GnssConstellationType;
+using GnssSvInfo = V1_0::IGnssCallback::GnssSvInfo;
+
+struct BlacklistedSourceHash {
+    inline int operator()(const BlacklistedSource& source) const {
+        return int(source.constellation) * 1000 + int(source.svid);
+    }
+};
+
+struct BlacklistedSourceEqual {
+    inline bool operator()(const BlacklistedSource& s1, const BlacklistedSource& s2) const {
+        return (s1.constellation == s2.constellation) && (s1.svid == s2.svid);
+    }
+};
+
+using BlacklistedSourceSet =
+    std::unordered_set<BlacklistedSource, BlacklistedSourceHash, BlacklistedSourceEqual>;
+using BlacklistedConstellationSet = std::unordered_set<GnssConstellationType>;
+
 struct GnssConfiguration : public IGnssConfiguration {
     // Methods from ::android::hardware::gnss::V1_0::IGnssConfiguration follow.
     Return<bool> setSuplEs(bool enabled) override;
@@ -30,11 +53,15 @@
     Return<bool> setEmergencySuplPdn(bool enable) override;
 
     // Methods from ::android::hardware::gnss::V1_1::IGnssConfiguration follow.
-    Return<bool> setBlacklist(
-        const hidl_vec<::android::hardware::gnss::V1_1::IGnssConfiguration::BlacklistedSource>&
-            blacklist) override;
+    Return<bool> setBlacklist(const hidl_vec<BlacklistedSource>& blacklist) override;
 
-    // Methods from ::android::hidl::base::V1_0::IBase follow.
+    Return<bool> isBlacklisted(const GnssSvInfo& gnssSvInfo) const;
+    std::recursive_mutex& getMutex() const;
+
+   private:
+    BlacklistedSourceSet mBlacklistedSourceSet;
+    BlacklistedConstellationSet mBlacklistedConstellationSet;
+    mutable std::recursive_mutex mMutex;
 };
 
 }  // namespace implementation