Python / iptables: original destination IP

I am trying to get the original destination information for packets forwarded with iptables (the ultimate goal is to redirect all network traffic to localhost while keeping the original destination IP address).
I am sending packages using the following code:

import socket  
HOST = '192.168.10.1'
PORT = 50007
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((HOST, PORT))
s.send(b'whatever')
s.close()

      

        
        
        
      

    

Then redirects it with:

iptables -t nat -A OUTPUT -d 192.168.10.1 -j DNAT --to 127.0.0.1

      

        
        
        
      

    

And then getting them with:

import socket
HOST = ''
PORT = 50007
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((HOST, PORT))
while True:
    s.listen(5)
    conn, addr = s.accept()
    print('Connected by', addr)
    data = conn.recv(1024)
    if(data):
        print(data)
conn.close()

      

        
        
        
      

    

I tried using something like

dst = conn.getsockopt(socket.SOL_IP, socket.SO_ORIGINAL_DST, 16)

      

        
        
        
      

    

but this leads to

AttributeError: 'module' object has no attribute 'SO_ORIGINAL_DST'