code: func LinkLocalAddr(linkAddr tcpip.LinkAddress) tcpip.Address {
  	// Convert a 48-bit MAC to an EUI-64 and then prepend the link-local
  	// header, FE80::.
  	//
  	// The conversion is very nearly:
  	//	aa:bb:cc:dd:ee:ff => FE80::Aabb:ccFF:FEdd:eeff
  	// Note the capital A. The conversion aa->Aa involves a bit flip.
  	lladdrb := [16]byte{
  		0:  0xFE,
  		1:  0x80,
  		8:  linkAddr[0] ^ 2,
  		9:  linkAddr[1],
  		10: linkAddr[2],
  		11: 0xFF,
  		12: 0xFE,
  		13: linkAddr[3],
  		14: linkAddr[4],
  		15: linkAddr[5],
  	}
  	return tcpip.Address(lladdrb[:])
  }
docs: // LinkLocalAddr computes the default IPv6 link-local address from a link-layer
  // (MAC) address.