1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
/*
* 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_
|
