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

tcpip/header/icmpv6.go

@@ -0,0 +1,121 @@
+// Copyright 2018 Google LLC
+//
+// 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 header
+
+import (
+	"encoding/binary"
+
+	"netstack/tcpip"
+)
+
+// ICMPv6 represents an ICMPv6 header stored in a byte array.
+type ICMPv6 []byte
+
+const (
+	// ICMPv6MinimumSize is the minimum size of a valid ICMP packet.
+	ICMPv6MinimumSize = 4
+
+	// ICMPv6ProtocolNumber is the ICMP transport protocol number.
+	ICMPv6ProtocolNumber tcpip.TransportProtocolNumber = 58
+
+	// ICMPv6NeighborSolicitMinimumSize is the minimum size of a
+	// neighbor solicitation packet.
+	ICMPv6NeighborSolicitMinimumSize = ICMPv6MinimumSize + 4 + 16
+
+	// ICMPv6NeighborAdvertSize is size of a neighbor advertisement.
+	ICMPv6NeighborAdvertSize = 32
+
+	// ICMPv6EchoMinimumSize is the minimum size of a valid ICMP echo packet.
+	ICMPv6EchoMinimumSize = 8
+
+	// ICMPv6DstUnreachableMinimumSize is the minimum size of a valid ICMP
+	// destination unreachable packet.
+	ICMPv6DstUnreachableMinimumSize = ICMPv6MinimumSize + 4
+
+	// ICMPv6PacketTooBigMinimumSize is the minimum size of a valid ICMP
+	// packet-too-big packet.
+	ICMPv6PacketTooBigMinimumSize = ICMPv6MinimumSize + 4
+)
+
+// ICMPv6Type is the ICMP type field described in RFC 4443 and friends.
+type ICMPv6Type byte
+
+// Typical values of ICMPv6Type defined in RFC 4443.
+const (
+	ICMPv6DstUnreachable ICMPv6Type = 1
+	ICMPv6PacketTooBig   ICMPv6Type = 2
+	ICMPv6TimeExceeded   ICMPv6Type = 3
+	ICMPv6ParamProblem   ICMPv6Type = 4
+	ICMPv6EchoRequest    ICMPv6Type = 128
+	ICMPv6EchoReply      ICMPv6Type = 129
+
+	// Neighbor Discovery Protocol (NDP) messages, see RFC 4861.
+
+	ICMPv6RouterSolicit   ICMPv6Type = 133
+	ICMPv6RouterAdvert    ICMPv6Type = 134
+	ICMPv6NeighborSolicit ICMPv6Type = 135
+	ICMPv6NeighborAdvert  ICMPv6Type = 136
+	ICMPv6RedirectMsg     ICMPv6Type = 137
+)
+
+// Values for ICMP code as defined in RFC 4443.
+const (
+	ICMPv6PortUnreachable = 4
+)
+
+// Type is the ICMP type field.
+func (b ICMPv6) Type() ICMPv6Type { return ICMPv6Type(b[0]) }
+
+// SetType sets the ICMP type field.
+func (b ICMPv6) SetType(t ICMPv6Type) { b[0] = byte(t) }
+
+// Code is the ICMP code field. Its meaning depends on the value of Type.
+func (b ICMPv6) Code() byte { return b[1] }
+
+// SetCode sets the ICMP code field.
+func (b ICMPv6) SetCode(c byte) { b[1] = c }
+
+// Checksum is the ICMP checksum field.
+func (b ICMPv6) Checksum() uint16 {
+	return binary.BigEndian.Uint16(b[2:])
+}
+
+// SetChecksum calculates and sets the ICMP checksum field.
+func (b ICMPv6) SetChecksum(checksum uint16) {
+	binary.BigEndian.PutUint16(b[2:], checksum)
+}
+
+// SourcePort implements Transport.SourcePort.
+func (ICMPv6) SourcePort() uint16 {
+	return 0
+}
+
+// DestinationPort implements Transport.DestinationPort.
+func (ICMPv6) DestinationPort() uint16 {
+	return 0
+}
+
+// SetSourcePort implements Transport.SetSourcePort.
+func (ICMPv6) SetSourcePort(uint16) {
+}
+
+// SetDestinationPort implements Transport.SetDestinationPort.
+func (ICMPv6) SetDestinationPort(uint16) {
+}
+
+// Payload implements Transport.Payload.
+func (b ICMPv6) Payload() []byte {
+	return b[ICMPv6MinimumSize:]
+}