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
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/*
* Copyright (C) 2023 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.
*/
package com.android.net.module.util.structs;
import static com.android.net.module.util.NetworkStackConstants.DHCP6_OPTION_IAPREFIX;
import androidx.annotation.VisibleForTesting;
import com.android.net.module.util.Struct;
import com.android.net.module.util.Struct.Field;
import com.android.net.module.util.Struct.Type;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
/**
* DHCPv6 IA Prefix Option.
* https://tools.ietf.org/html/rfc8415. This does not contain any option.
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | OPTION_IAPREFIX | option-len |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | preferred-lifetime |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | valid-lifetime |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | prefix-length | |
* +-+-+-+-+-+-+-+-+ IPv6-prefix |
* | (16 octets) |
* | |
* | |
* | |
* | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | | .
* +-+-+-+-+-+-+-+-+ .
* . IAprefix-options .
* . .
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
public class IaPrefixOption extends Struct {
public static final int LENGTH = 25; // option length excluding IAprefix-options
@Field(order = 0, type = Type.S16)
public final short code;
@Field(order = 1, type = Type.S16)
public final short length;
@Field(order = 2, type = Type.U32)
public final long preferred;
@Field(order = 3, type = Type.U32)
public final long valid;
@Field(order = 4, type = Type.S8)
public final byte prefixLen;
@Field(order = 5, type = Type.ByteArray, arraysize = 16)
public final byte[] prefix;
@VisibleForTesting
public IaPrefixOption(final short code, final short length, final long preferred,
final long valid, final byte prefixLen, final byte[] prefix) {
this.code = code;
this.length = length;
this.preferred = preferred;
this.valid = valid;
this.prefixLen = prefixLen;
this.prefix = prefix.clone();
}
/**
* Build an IA_PD prefix option with given specific parameters.
*/
public static ByteBuffer build(final short length, final long preferred, final long valid,
final byte prefixLen, final byte[] prefix) {
final IaPrefixOption option = new IaPrefixOption((byte) DHCP6_OPTION_IAPREFIX,
length /* 25 + IAPrefix options length */, preferred, valid, prefixLen, prefix);
return ByteBuffer.wrap(option.writeToBytes(ByteOrder.BIG_ENDIAN));
}
}
|
