| /* |
| * Copyright (C) 2021 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 com.android.net.module.util.Struct; |
| import com.android.net.module.util.Struct.Field; |
| import com.android.net.module.util.Struct.Type; |
| |
| /** |
| * ICMPv6 Router Advertisement header, follow [Icmpv6Header], as per |
| * https://tools.ietf.org/html/rfc4861. 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 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Type | Code | Checksum | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Cur Hop Limit |M|O| Reserved | Router Lifetime | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Reachable Time | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Retrans Timer | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Options ... |
| * +-+-+-+-+-+-+-+-+-+-+-+- |
| */ |
| public class RaHeader extends Struct { |
| @Field(order = 0, type = Type.S8) |
| public final byte hopLimit; |
| // "Managed address configuration", "Other configuration" bits, and 6 reserved bits |
| @Field(order = 1, type = Type.S8) |
| public final byte flags; |
| @Field(order = 2, type = Type.U16) |
| public final int lifetime; |
| @Field(order = 3, type = Type.U32) |
| public final long reachableTime; |
| @Field(order = 4, type = Type.U32) |
| public final long retransTimer; |
| |
| public RaHeader(final byte hopLimit, final byte flags, final int lifetime, |
| final long reachableTime, final long retransTimer) { |
| this.hopLimit = hopLimit; |
| this.flags = flags; |
| this.lifetime = lifetime; |
| this.reachableTime = reachableTime; |
| this.retransTimer = retransTimer; |
| } |
| } |