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diff --git a/hicn-light/src/hicn/core/pit.h b/hicn-light/src/hicn/core/pit.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.
+ */
+
+/**
+ * @file pit.h
+ * @brief hICN Pending Interest Table (PIT)
+ */
+
+#ifndef HICNLIGHT_PIT_H
+#define HICNLIGHT_PIT_H
+
+#include <hicn/core/fib.h>
+
+typedef struct {
+  nexthops_t ingressIdSet;
+  nexthops_t egressIdSet;
+  fib_entry_t* fib_entry;
+} pit_entry_t;
+
+#define pit_entry_get_ingress(E) (&((E)->ingressIdSet))
+#define pit_entry_get_egress(E) (&((E)->egressIdSet))
+#define pit_entry_get_fib_entry(E) ((E)->fib_entry)
+#define pit_entry_set_fib_entry(E, FIB_ENTRY) ((E)->fib_entry = FIB_ENTRY)
+
+#define pit_entry_ingress_add(E, NH) \
+  nexthops_add(pit_entry_get_ingress(E), (NH))
+
+#define pit_entry_ingress_contains(E, NH) \
+  nexthops_contains(pit_entry_get_ingress(E), (NH))
+
+#define pit_entry_egress_add(E, NH) nexthops_add(pit_entry_get_egress(E), (NH))
+
+typedef struct {
+  // TODO(eloparco): How to handle PIT size?
+  size_t max_size;
+} pit_t;
+
+#define DEFAULT_INTEREST_LIFETIME 4000000000ULL
+
+Ticks pit_calculate_lifetime(pit_t* pit, const msgbuf_t* msgbuf);
+
+/**
+ * @brief Allocate a new PIT data structure (extended parameters)
+ *
+ * @param init_size Initial size (0 = default)
+ * @param max_size Maximum size (0 = unbounded)
+ *
+ * @return pit_t* Newly allocated PIT data structure
+ */
+pit_t* _pit_create(size_t init_size, size_t max_size);
+
+/**
+ * @brief Allocate a new PIT data structure
+ *
+ * @return pit_t* Newly allocated PIT data structure
+ */
+#define pit_create() _pit_create(0, 0)
+
+void pit_free(pit_t* pit);
+
+#endif /* HICNLIGHT_PIT_H */