使用cmsg公共库解析cmsg信息，对业务层提供获取cmsg句柄的接口

platform/src/tcp_stream.cpp

@@ -1300,6 +1300,18 @@ int tfe_stream_option_set(struct tfe_stream * stream, enum tfe_stream_option opt
 	return 0;
 }
 
+struct tfe_cmsg * tfe_stream_get0_cmsg(const struct tfe_stream * stream)
+{
+    struct tfe_stream_private * _stream = container_of(stream, struct tfe_stream_private, head);
+    return _stream->cmsg;
+}
+void tfe_stream_cmsg_setup(const struct tfe_stream * stream, struct tfe_cmsg * cmsg)
+{
+    struct tfe_stream_private * _stream = container_of(stream, struct tfe_stream_private, head);
+    assert(_stream->cmsg == NULL);
+    _stream->cmsg = cmsg;
+}
+
 void tfe_stream_write_access_log(const struct tfe_stream * stream, int level, const char * fmt, ...)
 {
 	va_list arg_ptr;