github.com/metacubex/sing-tun@v0.2.7-0.20240512075008-89e7c6208eec/internal/clashtcpip/icmpv6.go (about)

     1  package clashtcpip
     2  
     3  import (
     4  	"encoding/binary"
     5  )
     6  
     7  type ICMPv6Packet []byte
     8  
     9  const (
    10  	ICMPv6HeaderSize = 4
    11  
    12  	ICMPv6MinimumSize = 8
    13  
    14  	ICMPv6PayloadOffset = 8
    15  
    16  	ICMPv6EchoMinimumSize = 8
    17  
    18  	ICMPv6ErrorHeaderSize = 8
    19  
    20  	ICMPv6DstUnreachableMinimumSize = ICMPv6MinimumSize
    21  
    22  	ICMPv6PacketTooBigMinimumSize = ICMPv6MinimumSize
    23  
    24  	ICMPv6ChecksumOffset = 2
    25  
    26  	icmpv6PointerOffset = 4
    27  
    28  	icmpv6MTUOffset = 4
    29  
    30  	icmpv6IdentOffset = 4
    31  
    32  	icmpv6SequenceOffset = 6
    33  
    34  	NDPHopLimit = 255
    35  )
    36  
    37  type ICMPv6Type byte
    38  
    39  const (
    40  	ICMPv6DstUnreachable ICMPv6Type = 1
    41  	ICMPv6PacketTooBig   ICMPv6Type = 2
    42  	ICMPv6TimeExceeded   ICMPv6Type = 3
    43  	ICMPv6ParamProblem   ICMPv6Type = 4
    44  	ICMPv6EchoRequest    ICMPv6Type = 128
    45  	ICMPv6EchoReply      ICMPv6Type = 129
    46  
    47  	ICMPv6RouterSolicit   ICMPv6Type = 133
    48  	ICMPv6RouterAdvert    ICMPv6Type = 134
    49  	ICMPv6NeighborSolicit ICMPv6Type = 135
    50  	ICMPv6NeighborAdvert  ICMPv6Type = 136
    51  	ICMPv6RedirectMsg     ICMPv6Type = 137
    52  
    53  	ICMPv6MulticastListenerQuery  ICMPv6Type = 130
    54  	ICMPv6MulticastListenerReport ICMPv6Type = 131
    55  	ICMPv6MulticastListenerDone   ICMPv6Type = 132
    56  )
    57  
    58  func (typ ICMPv6Type) IsErrorType() bool {
    59  	return typ&0x80 == 0
    60  }
    61  
    62  type ICMPv6Code byte
    63  
    64  const (
    65  	ICMPv6NetworkUnreachable ICMPv6Code = 0
    66  	ICMPv6Prohibited         ICMPv6Code = 1
    67  	ICMPv6BeyondScope        ICMPv6Code = 2
    68  	ICMPv6AddressUnreachable ICMPv6Code = 3
    69  	ICMPv6PortUnreachable    ICMPv6Code = 4
    70  	ICMPv6Policy             ICMPv6Code = 5
    71  	ICMPv6RejectRoute        ICMPv6Code = 6
    72  )
    73  
    74  const (
    75  	ICMPv6HopLimitExceeded  ICMPv6Code = 0
    76  	ICMPv6ReassemblyTimeout ICMPv6Code = 1
    77  )
    78  
    79  const (
    80  	ICMPv6ErroneousHeader ICMPv6Code = 0
    81  
    82  	ICMPv6UnknownHeader ICMPv6Code = 1
    83  
    84  	ICMPv6UnknownOption ICMPv6Code = 2
    85  )
    86  
    87  const ICMPv6UnusedCode ICMPv6Code = 0
    88  
    89  func (b ICMPv6Packet) Type() ICMPv6Type {
    90  	return ICMPv6Type(b[0])
    91  }
    92  
    93  func (b ICMPv6Packet) SetType(t ICMPv6Type) {
    94  	b[0] = byte(t)
    95  }
    96  
    97  func (b ICMPv6Packet) Code() ICMPv6Code {
    98  	return ICMPv6Code(b[1])
    99  }
   100  
   101  func (b ICMPv6Packet) SetCode(c ICMPv6Code) {
   102  	b[1] = byte(c)
   103  }
   104  
   105  func (b ICMPv6Packet) TypeSpecific() uint32 {
   106  	return binary.BigEndian.Uint32(b[icmpv6PointerOffset:])
   107  }
   108  
   109  func (b ICMPv6Packet) SetTypeSpecific(val uint32) {
   110  	binary.BigEndian.PutUint32(b[icmpv6PointerOffset:], val)
   111  }
   112  
   113  func (b ICMPv6Packet) Checksum() uint16 {
   114  	return binary.BigEndian.Uint16(b[ICMPv6ChecksumOffset:])
   115  }
   116  
   117  func (b ICMPv6Packet) SetChecksum(sum [2]byte) {
   118  	_ = b[ICMPv6ChecksumOffset+1]
   119  	b[ICMPv6ChecksumOffset] = sum[0]
   120  	b[ICMPv6ChecksumOffset+1] = sum[1]
   121  }
   122  
   123  func (ICMPv6Packet) SourcePort() uint16 {
   124  	return 0
   125  }
   126  
   127  func (ICMPv6Packet) DestinationPort() uint16 {
   128  	return 0
   129  }
   130  
   131  func (ICMPv6Packet) SetSourcePort(uint16) {
   132  }
   133  
   134  func (ICMPv6Packet) SetDestinationPort(uint16) {
   135  }
   136  
   137  func (b ICMPv6Packet) MTU() uint32 {
   138  	return binary.BigEndian.Uint32(b[icmpv6MTUOffset:])
   139  }
   140  
   141  func (b ICMPv6Packet) SetMTU(mtu uint32) {
   142  	binary.BigEndian.PutUint32(b[icmpv6MTUOffset:], mtu)
   143  }
   144  
   145  func (b ICMPv6Packet) Ident() uint16 {
   146  	return binary.BigEndian.Uint16(b[icmpv6IdentOffset:])
   147  }
   148  
   149  func (b ICMPv6Packet) SetIdent(ident uint16) {
   150  	binary.BigEndian.PutUint16(b[icmpv6IdentOffset:], ident)
   151  }
   152  
   153  func (b ICMPv6Packet) Sequence() uint16 {
   154  	return binary.BigEndian.Uint16(b[icmpv6SequenceOffset:])
   155  }
   156  
   157  func (b ICMPv6Packet) SetSequence(sequence uint16) {
   158  	binary.BigEndian.PutUint16(b[icmpv6SequenceOffset:], sequence)
   159  }
   160  
   161  func (b ICMPv6Packet) MessageBody() []byte {
   162  	return b[ICMPv6HeaderSize:]
   163  }
   164  
   165  func (b ICMPv6Packet) Payload() []byte {
   166  	return b[ICMPv6PayloadOffset:]
   167  }
   168  
   169  func (b ICMPv6Packet) ResetChecksum(psum uint32) {
   170  	b.SetChecksum(zeroChecksum)
   171  	b.SetChecksum(Checksum(psum, b))
   172  }