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网络层的一些头文件 除去ipv4相关的 都是一些我不准备看的代码 直接复制了
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146
tcpip/header/ipv6_fragment.go
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146
tcpip/header/ipv6_fragment.go
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// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package header
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import (
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"encoding/binary"
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"netstack/tcpip"
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)
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const (
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nextHdrFrag = 0
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fragOff = 2
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more = 3
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idV6 = 4
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)
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// IPv6FragmentFields contains the fields of an IPv6 fragment. It is used to describe the
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// fields of a packet that needs to be encoded.
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type IPv6FragmentFields struct {
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// NextHeader is the "next header" field of an IPv6 fragment.
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NextHeader uint8
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// FragmentOffset is the "fragment offset" field of an IPv6 fragment.
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FragmentOffset uint16
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// M is the "more" field of an IPv6 fragment.
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M bool
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// Identification is the "identification" field of an IPv6 fragment.
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Identification uint32
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}
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// IPv6Fragment represents an ipv6 fragment header stored in a byte array.
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// Most of the methods of IPv6Fragment access to the underlying slice without
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// checking the boundaries and could panic because of 'index out of range'.
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// Always call IsValid() to validate an instance of IPv6Fragment before using other methods.
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type IPv6Fragment []byte
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const (
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// IPv6FragmentHeader header is the number used to specify that the next
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// header is a fragment header, per RFC 2460.
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IPv6FragmentHeader = 44
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// IPv6FragmentHeaderSize is the size of the fragment header.
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IPv6FragmentHeaderSize = 8
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)
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// Encode encodes all the fields of the ipv6 fragment.
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func (b IPv6Fragment) Encode(i *IPv6FragmentFields) {
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b[nextHdrFrag] = i.NextHeader
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binary.BigEndian.PutUint16(b[fragOff:], i.FragmentOffset<<3)
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if i.M {
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b[more] |= 1
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}
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binary.BigEndian.PutUint32(b[idV6:], i.Identification)
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}
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// IsValid performs basic validation on the fragment header.
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func (b IPv6Fragment) IsValid() bool {
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return len(b) >= IPv6FragmentHeaderSize
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}
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// NextHeader returns the value of the "next header" field of the ipv6 fragment.
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func (b IPv6Fragment) NextHeader() uint8 {
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return b[nextHdrFrag]
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}
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// FragmentOffset returns the "fragment offset" field of the ipv6 fragment.
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func (b IPv6Fragment) FragmentOffset() uint16 {
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return binary.BigEndian.Uint16(b[fragOff:]) >> 3
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}
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// More returns the "more" field of the ipv6 fragment.
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func (b IPv6Fragment) More() bool {
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return b[more]&1 > 0
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}
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// Payload implements Network.Payload.
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func (b IPv6Fragment) Payload() []byte {
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return b[IPv6FragmentHeaderSize:]
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}
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// ID returns the value of the identifier field of the ipv6 fragment.
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func (b IPv6Fragment) ID() uint32 {
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return binary.BigEndian.Uint32(b[idV6:])
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}
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// TransportProtocol implements Network.TransportProtocol.
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func (b IPv6Fragment) TransportProtocol() tcpip.TransportProtocolNumber {
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return tcpip.TransportProtocolNumber(b.NextHeader())
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}
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// The functions below have been added only to satisfy the Network interface.
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// Checksum is not supported by IPv6Fragment.
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func (b IPv6Fragment) Checksum() uint16 {
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panic("not supported")
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}
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// SourceAddress is not supported by IPv6Fragment.
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func (b IPv6Fragment) SourceAddress() tcpip.Address {
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panic("not supported")
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}
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// DestinationAddress is not supported by IPv6Fragment.
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func (b IPv6Fragment) DestinationAddress() tcpip.Address {
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panic("not supported")
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}
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// SetSourceAddress is not supported by IPv6Fragment.
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func (b IPv6Fragment) SetSourceAddress(tcpip.Address) {
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panic("not supported")
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}
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// SetDestinationAddress is not supported by IPv6Fragment.
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func (b IPv6Fragment) SetDestinationAddress(tcpip.Address) {
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panic("not supported")
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}
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// SetChecksum is not supported by IPv6Fragment.
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func (b IPv6Fragment) SetChecksum(uint16) {
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panic("not supported")
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}
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// TOS is not supported by IPv6Fragment.
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func (b IPv6Fragment) TOS() (uint8, uint32) {
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panic("not supported")
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}
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// SetTOS is not supported by IPv6Fragment.
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func (b IPv6Fragment) SetTOS(t uint8, l uint32) {
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panic("not supported")
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}
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