增加TCP Passthrough功能实现，调通明文转发流程。

platform/include/internal/platform.h

@@ -12,7 +12,7 @@ struct tfe_thread_ctx
 {
 	pthread_t thr;
 	unsigned int thread_id;
-	size_t load;
+	unsigned int load;
 
 	struct event_base * evbase;
 	unsigned char running;
@@ -20,9 +20,6 @@ struct tfe_thread_ctx
 	struct tfe_stats stat;
 	struct cert_mgr * cert_mgr;
 
-	struct sess_cache * dsess_cache;
-	struct sess_cache * ssess_cache;
-
 	unsigned int nr_modules;
 	const struct tfe_plugin * modules;
 };
@@ -84,7 +81,9 @@ struct tfe_stream_private
 	int plugin_num;
 
 	struct plugin_ctx * plug_ctx;
-	unsigned char passthrough;      /* 1 if SSL passthrough is active */
+
+	/* TCP forward without scan or decode when the passthough is set */
+	bool passthough;
 
 	/* For defer connection setup */
 	evutil_socket_t defer_fd_downstream;
@@ -98,5 +97,5 @@ struct tfe_stream_private
 
 static inline void * __STREAM_LOGGER(struct tfe_stream_private * _stream)
 {
-	return _stream->proxy_ref->main_logger;
+	return _stream->proxy_ref->logger;
 }