github.com/Andyfoo/golang/x/net@v0.0.0-20190901054642-57c1bf301704/icmp/ipv6.go (about)

     1  // Copyright 2013 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package icmp
     6  
     7  import (
     8  	"net"
     9  
    10  	"github.com/Andyfoo/golang/x/net/internal/iana"
    11  )
    12  
    13  const ipv6PseudoHeaderLen = 2*net.IPv6len + 8
    14  
    15  // IPv6PseudoHeader returns an IPv6 pseudo header for checksum
    16  // calculation.
    17  func IPv6PseudoHeader(src, dst net.IP) []byte {
    18  	b := make([]byte, ipv6PseudoHeaderLen)
    19  	copy(b, src.To16())
    20  	copy(b[net.IPv6len:], dst.To16())
    21  	b[len(b)-1] = byte(iana.ProtocolIPv6ICMP)
    22  	return b
    23  }