Add system stack

internal/clashtcpip/icmpv6.go

@@ -0,0 +1,172 @@
+package clashtcpip
+
+import (
+	"encoding/binary"
+)
+
+type ICMPv6Packet []byte
+
+const (
+	ICMPv6HeaderSize = 4
+
+	ICMPv6MinimumSize = 8
+
+	ICMPv6PayloadOffset = 8
+
+	ICMPv6EchoMinimumSize = 8
+
+	ICMPv6ErrorHeaderSize = 8
+
+	ICMPv6DstUnreachableMinimumSize = ICMPv6MinimumSize
+
+	ICMPv6PacketTooBigMinimumSize = ICMPv6MinimumSize
+
+	ICMPv6ChecksumOffset = 2
+
+	icmpv6PointerOffset = 4
+
+	icmpv6MTUOffset = 4
+
+	icmpv6IdentOffset = 4
+
+	icmpv6SequenceOffset = 6
+
+	NDPHopLimit = 255
+)
+
+type ICMPv6Type byte
+
+const (
+	ICMPv6DstUnreachable ICMPv6Type = 1
+	ICMPv6PacketTooBig   ICMPv6Type = 2
+	ICMPv6TimeExceeded   ICMPv6Type = 3
+	ICMPv6ParamProblem   ICMPv6Type = 4
+	ICMPv6EchoRequest    ICMPv6Type = 128
+	ICMPv6EchoReply      ICMPv6Type = 129
+
+	ICMPv6RouterSolicit   ICMPv6Type = 133
+	ICMPv6RouterAdvert    ICMPv6Type = 134
+	ICMPv6NeighborSolicit ICMPv6Type = 135
+	ICMPv6NeighborAdvert  ICMPv6Type = 136
+	ICMPv6RedirectMsg     ICMPv6Type = 137
+
+	ICMPv6MulticastListenerQuery  ICMPv6Type = 130
+	ICMPv6MulticastListenerReport ICMPv6Type = 131
+	ICMPv6MulticastListenerDone   ICMPv6Type = 132
+)
+
+func (typ ICMPv6Type) IsErrorType() bool {
+	return typ&0x80 == 0
+}
+
+type ICMPv6Code byte
+
+const (
+	ICMPv6NetworkUnreachable ICMPv6Code = 0
+	ICMPv6Prohibited         ICMPv6Code = 1
+	ICMPv6BeyondScope        ICMPv6Code = 2
+	ICMPv6AddressUnreachable ICMPv6Code = 3
+	ICMPv6PortUnreachable    ICMPv6Code = 4
+	ICMPv6Policy             ICMPv6Code = 5
+	ICMPv6RejectRoute        ICMPv6Code = 6
+)
+
+const (
+	ICMPv6HopLimitExceeded  ICMPv6Code = 0
+	ICMPv6ReassemblyTimeout ICMPv6Code = 1
+)
+
+const (
+	ICMPv6ErroneousHeader ICMPv6Code = 0
+
+	ICMPv6UnknownHeader ICMPv6Code = 1
+
+	ICMPv6UnknownOption ICMPv6Code = 2
+)
+
+const ICMPv6UnusedCode ICMPv6Code = 0
+
+func (b ICMPv6Packet) Type() ICMPv6Type {
+	return ICMPv6Type(b[0])
+}
+
+func (b ICMPv6Packet) SetType(t ICMPv6Type) {
+	b[0] = byte(t)
+}
+
+func (b ICMPv6Packet) Code() ICMPv6Code {
+	return ICMPv6Code(b[1])
+}
+
+func (b ICMPv6Packet) SetCode(c ICMPv6Code) {
+	b[1] = byte(c)
+}
+
+func (b ICMPv6Packet) TypeSpecific() uint32 {
+	return binary.BigEndian.Uint32(b[icmpv6PointerOffset:])
+}
+
+func (b ICMPv6Packet) SetTypeSpecific(val uint32) {
+	binary.BigEndian.PutUint32(b[icmpv6PointerOffset:], val)
+}
+
+func (b ICMPv6Packet) Checksum() uint16 {
+	return binary.BigEndian.Uint16(b[ICMPv6ChecksumOffset:])
+}
+
+func (b ICMPv6Packet) SetChecksum(sum [2]byte) {
+	_ = b[ICMPv6ChecksumOffset+1]
+	b[ICMPv6ChecksumOffset] = sum[0]
+	b[ICMPv6ChecksumOffset+1] = sum[1]
+}
+
+func (ICMPv6Packet) SourcePort() uint16 {
+	return 0
+}
+
+func (ICMPv6Packet) DestinationPort() uint16 {
+	return 0
+}
+
+func (ICMPv6Packet) SetSourcePort(uint16) {
+}
+
+func (ICMPv6Packet) SetDestinationPort(uint16) {
+}
+
+func (b ICMPv6Packet) MTU() uint32 {
+	return binary.BigEndian.Uint32(b[icmpv6MTUOffset:])
+}
+
+func (b ICMPv6Packet) SetMTU(mtu uint32) {
+	binary.BigEndian.PutUint32(b[icmpv6MTUOffset:], mtu)
+}
+
+func (b ICMPv6Packet) Ident() uint16 {
+	return binary.BigEndian.Uint16(b[icmpv6IdentOffset:])
+}
+
+func (b ICMPv6Packet) SetIdent(ident uint16) {
+	binary.BigEndian.PutUint16(b[icmpv6IdentOffset:], ident)
+}
+
+func (b ICMPv6Packet) Sequence() uint16 {
+	return binary.BigEndian.Uint16(b[icmpv6SequenceOffset:])
+}
+
+func (b ICMPv6Packet) SetSequence(sequence uint16) {
+	binary.BigEndian.PutUint16(b[icmpv6SequenceOffset:], sequence)
+}
+
+func (b ICMPv6Packet) MessageBody() []byte {
+	return b[ICMPv6HeaderSize:]
+}
+
+func (b ICMPv6Packet) Payload() []byte {
+	return b[ICMPv6PayloadOffset:]
+}
+
+func (b ICMPv6Packet) ResetChecksum(psum uint32) {
+	b.SetChecksum(zeroChecksum)
+	b.SetChecksum(Checksum(psum, b))
+}