Forward traffic from docker to host

I have a docker acting as VPN server in a host. Then, the traffic passes trhough the eth0 of the host from a VPN client, then encrypted traffic, and finally arrives to the tun0 in the docker. What I want is to forward the dencrypted traffic to the host again. How could I do it? Traffic flow: > VPN client > --encrypt(traffic)--eth0(host)--encrypt(traffic)--tun0(docker)--traffic--interface(host)