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diff --git a/hicn-light/src/hicn/content_store/lru.h b/hicn-light/src/hicn/content_store/lru.h
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+++ b/hicn-light/src/hicn/content_store/lru.h
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+/*
+ * Copyright (c) 2021 Cisco and/or its affiliates.
+ * 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.
+ */
+
+#ifndef HICNLIGHT_CS_LRU_H
+#define HICNLIGHT_CS_LRU_H
+
+#define LRU_FAILURE 0
+#define LRU_SUCCESS 1
+#define LRU_EVICTION 2
+
+typedef struct {
+  off_t prev;
+  off_t next;
+} cs_entry_lru_state_t;
+
+typedef struct {
+  off_t head;
+  off_t tail;
+} cs_lru_state_t;
+
+/**
+ * @brief Count the number of:
+ * - CS matches
+ * - CS misses
+ * - entries added to CS/LRU (upon receiving a data packet)
+ * - entries updated in the LRU
+ *   (because an already-existing CS entry has been updated)
+ * - LRU evictions
+ *
+ * 'countExpiryEvictions' is not collected since an entry is never evicted
+ * because of expiration. An expired CS entry is only detected when
+ * a data packet with the same name is received, causing an update
+ * (NOT an actual eviction).
+ */
+typedef struct {
+  uint64_t countHits;
+  uint64_t countMisses;
+  uint64_t countAdds;
+  uint64_t countUpdates;
+  uint64_t countLruDeletions;
+  uint64_t countLruEvictions;
+} cs_lru_stats_t;
+
+#endif /* HICNLIGHT_CS_LRU_H */