text: // Copyright 2013 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package icmp
  
  import (
  	"net"
  
  	"golang.org/x/net/internal/iana"
  )
  
  const ipv6PseudoHeaderLen = 2*net.IPv6len + 8
  
  // IPv6PseudoHeader returns an IPv6 pseudo header for checksum
  // calculation.
  func IPv6PseudoHeader(src, dst net.IP) []byte {
  	b := make([]byte, ipv6PseudoHeaderLen)
  	copy(b, src.To16())
  	copy(b[net.IPv6len:], dst.To16())
  	b[len(b)-1] = byte(iana.ProtocolIPv6ICMP)
  	return b
  }
  