|
|
/*
|
|
|
* 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 4
|
|
|
|
|
|
/**
|
|
|
* Runs a packet filtering program over a packet.
|
|
|
*
|
|
|
* The text section containing the program instructions starts at address
|
|
|
* program and stops at + program_len - 1, and the writable data section
|
|
|
* begins at program + program_len and ends at program + ram_len - 1,
|
|
|
* as described in the following diagram:
|
|
|
*
|
|
|
* program program + program_len program + ram_len
|
|
|
* | text section | data section |
|
|
|
* +--------------------+------------------------+
|
|
|
*
|
|
|
* @param program the program bytecode, followed by the writable data region.
|
|
|
* @param program_len the length in bytes of the read-only portion of the APF
|
|
|
* buffer pointed to by {@code program}.
|
|
|
* @param ram_len total length of the APF buffer pointed to by {@code program},
|
|
|
* including the read-only bytecode portion and the read-write
|
|
|
* data portion.
|
|
|
* @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(uint8_t* program, uint32_t program_len, uint32_t ram_len,
|
|
|
const uint8_t* packet, uint32_t packet_len,
|
|
|
uint32_t filter_age);
|
|
|
|
|
|
#ifdef __cplusplus
|
|
|
}
|
|
|
#endif
|
|
|
|
|
|
#endif // APF_INTERPRETER_H_
|
