IPv6 traffic in "redirect" mode causes connection startup errors

[klyubin]

Client attempts to connect to http://ipv6.whatismyv6.com/. nogotofail MiTM, running in redirect (not tproxy!) mode spews:

[ERROR] Socket error in connection startup from fd12:3456:789a:bcde::1000
[ERROR] [Errno 2] No such file or directory
Traceback (most recent call last):
File "nogotofail/mitm/connection/server.py", line 176, in _on_server_socket_select
self.setup_connection(client_socket)
File "nogotofail/mitm/connection/server.py", line 100, in setup_connection
if connection.start():
File "nogotofail/mitm/connection/connection.py", line 698, in start
self._get_original_dest(self.client_socket))
File "nogotofail/mitm/connection/connection.py", line 723, in _get_original_dest
dst = sock.getsockopt(socket.SOL_IP, SO_ORIGINAL_DST, 28)
File "/usr/lib64/python2.7/socket.py", line 228, in meth
return getattr(self._sock,name)(*args)
error: [Errno 2] No such file or directory