diff --git a/gnss/aidl/default/GnssConfiguration.cpp b/gnss/aidl/default/GnssConfiguration.cpp
new file mode 100644
index 0000000..30e0d8c
--- /dev/null
+++ b/gnss/aidl/default/GnssConfiguration.cpp
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "GnssConfigurationAidl"
+
+#include "GnssConfiguration.h"
+#include <log/log.h>
+
+namespace aidl::android::hardware::gnss {
+
+ndk::ScopedAStatus GnssConfiguration::setBlocklist(const vector<BlocklistedSource>& sourceList) {
+    ALOGD("GnssConfiguration::setBlocklist");
+    std::unique_lock<std::recursive_mutex> lock(mMutex);
+    mBlocklistedConstellationSet.clear();
+    mBlocklistedSourceSet.clear();
+    for (const auto& source : sourceList) {
+        if (source.svid == 0) {
+            // Wildcard blocklist, i.e., blocklist entire constellation.
+            mBlocklistedConstellationSet.insert(source.constellation);
+        } else {
+            mBlocklistedSourceSet.insert(source);
+        }
+    }
+    return ndk::ScopedAStatus::ok();
+}
+
+bool GnssConfiguration::isBlocklistedV2_1(const GnssSvInfoV2_1& gnssSvInfo) const {
+    std::unique_lock<std::recursive_mutex> lock(mMutex);
+    if (mBlocklistedConstellationSet.find(static_cast<GnssConstellationType>(
+                gnssSvInfo.v2_0.constellation)) != mBlocklistedConstellationSet.end()) {
+        return true;
+    }
+    BlocklistedSource source = {
+            .constellation = static_cast<GnssConstellationType>(gnssSvInfo.v2_0.constellation),
+            .svid = gnssSvInfo.v2_0.v1_0.svid};
+    return (mBlocklistedSourceSet.find(source) != mBlocklistedSourceSet.end());
+}
+
+}  // namespace aidl::android::hardware::gnss