1 files changed, 14 insertions, 0 deletions
diff --git a/src/tun.h b/src/tun.h
new file mode 100644
index 0000000..98a307d
--- /dev/null
+++ b/src/tun.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+
+#pragma once
+
+//
+// This module implements a Linux tun device. The tun_alloc() functions creates a tun device
+// with a given name, IP address, subnet mask and MTU.
+//
+
+#include <linux/if.h>
+
+/// Allocate a tun device with the given CIDR (e.g. "172.16.0.1/24") and MTU.
+/// Returns fd on success, -1 on failure (errno is set).
+int tun_alloc(const char* ifname, const char* cidr, int mtu);