diff --git a/common/CMakeLists.txt b/common/CMakeLists.txt
index ff152a83..ea7bb73d 100644
--- a/common/CMakeLists.txt
+++ b/common/CMakeLists.txt
@@ -19,6 +19,7 @@ set(COMMON_SOURCES
   src/option.c
   src/framebuffer.c
   src/KVMFR.c
+  src/countedbuffer.c
 )
 
 add_library(lg_common STATIC ${COMMON_SOURCES})
diff --git a/common/include/common/countedbuffer.h b/common/include/common/countedbuffer.h
new file mode 100644
index 00000000..83ab1a94
--- /dev/null
+++ b/common/include/common/countedbuffer.h
@@ -0,0 +1,30 @@
+/*
+Looking Glass - KVM FrameRelay (KVMFR) Client
+Copyright (C) 2021 Guanzhong Chen <quantum2048@gmail.com>
+https://looking-glass.hostfission.com
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; either version 2 of the License, or (at your option) any later
+version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include <stddef.h>
+
+struct CountedBuffer {
+  _Atomic(size_t) refs;
+  size_t size;
+  char data[];
+};
+
+struct CountedBuffer * countedBufferNew(size_t size);
+void countedBufferAddRef(struct CountedBuffer * buffer);
+void countedBufferRelease(struct CountedBuffer ** buffer);
diff --git a/common/src/countedbuffer.c b/common/src/countedbuffer.c
new file mode 100644
index 00000000..4ac8b379
--- /dev/null
+++ b/common/src/countedbuffer.c
@@ -0,0 +1,47 @@
+/*
+Looking Glass - KVM FrameRelay (KVMFR) Client
+Copyright (C) 2021 Guanzhong Chen <quantum2048@gmail.com>
+https://looking-glass.hostfission.com
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; either version 2 of the License, or (at your option) any later
+version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include "common/countedbuffer.h"
+#include <stdlib.h>
+#include <stdatomic.h>
+
+struct CountedBuffer * countedBufferNew(size_t size)
+{
+  struct CountedBuffer * buffer = malloc(sizeof(struct CountedBuffer) + size);
+  if (!buffer)
+    return NULL;
+
+  atomic_init(&buffer->refs, 1);
+  buffer->size = size;
+  return buffer;
+}
+
+void countedBufferAddRef(struct CountedBuffer * buffer)
+{
+  atomic_fetch_add(&buffer->refs, 1);
+}
+
+void countedBufferRelease(struct CountedBuffer ** buffer)
+{
+  if (atomic_fetch_sub(&(*buffer)->refs, 1) == 1)
+  {
+    free(*buffer);
+    *buffer = NULL;
+  }
+}