github.com/MerlinKodo/sing-tun@v0.1.15/internal/clashtcpip/icmp.go (about)

     1  package clashtcpip
     2  
     3  import (
     4  	"encoding/binary"
     5  )
     6  
     7  type ICMPType = byte
     8  
     9  const (
    10  	ICMPTypePingRequest  byte = 0x8
    11  	ICMPTypePingResponse byte = 0x0
    12  )
    13  
    14  type ICMPPacket []byte
    15  
    16  func (p ICMPPacket) Type() ICMPType {
    17  	return p[0]
    18  }
    19  
    20  func (p ICMPPacket) SetType(v ICMPType) {
    21  	p[0] = v
    22  }
    23  
    24  func (p ICMPPacket) Code() byte {
    25  	return p[1]
    26  }
    27  
    28  func (p ICMPPacket) Checksum() uint16 {
    29  	return binary.BigEndian.Uint16(p[2:])
    30  }
    31  
    32  func (p ICMPPacket) SetChecksum(sum [2]byte) {
    33  	p[2] = sum[0]
    34  	p[3] = sum[1]
    35  }
    36  
    37  func (p ICMPPacket) ResetChecksum() {
    38  	p.SetChecksum(zeroChecksum)
    39  	p.SetChecksum(Checksum(0, p))
    40  }