drop proxied socket when send/recv error

Author: zonyitoo

crates/shadowsocks-service/src/local/net/udp/association.rs

@@ -457,6 +457,9 @@ where
                     data.len(),
                     err
                 );
+
+                // Drop the socket and reconnect to another server.
+                self.proxied_socket = None;
             }
         }
 

crates/shadowsocks-service/src/local/tunnel/udprelay.rs

@@ -343,6 +343,9 @@ impl UdpAssociationContext {
                     data.len(),
                     err
                 );
+
+                // Drop the socket and reconnect to another server.
+                self.proxied_socket = None;
             }
         }