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diff --git a/apf_interpreter.h b/apf_interpreter.h
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+/*
+ * Copyright 2015, 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.
+ */
+
+#ifndef APF_INTERPRETER_H_
+#define APF_INTERPRETER_H_
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Version of APF instruction set processed by accept_packet().
+ * Should be returned by wifi_get_packet_filter_info.
+ */
+#define APF_VERSION 2
+
+/**
+ * Runs a packet filtering program over a packet.
+ *
+ * @param program the program bytecode.
+ * @param program_len the length of {@code apf_program} in bytes.
+ * @param packet the packet bytes, starting from the 802.3 header and not
+ *               including any CRC bytes at the end.
+ * @param packet_len the length of {@code packet} in bytes.
+ * @param filter_age the number of seconds since the filter was programmed.
+ *
+ * @return non-zero if packet should be passed to AP, zero if
+ *         packet should be dropped.
+ */
+int accept_packet(const uint8_t* program, uint32_t program_len,
+                  const uint8_t* packet, uint32_t packet_len,
+                  uint32_t filter_age);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // APF_INTERPRETER_H_