1 files changed, 11 insertions, 0 deletions
diff --git a/net/tap-linux.c b/net/tap-linux.c
index 79a9dd0da0..98b0ae9602 100644
--- a/net/tap-linux.c
+++ b/net/tap-linux.c
@@ -201,6 +201,17 @@ int tap_probe_has_uso(int fd)
     return 1;
 }
 
+bool tap_probe_has_tunnel(int fd)
+{
+    unsigned offload;
+
+    offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_UDP_TUNNEL_GSO;
+    if (ioctl(fd, TUNSETOFFLOAD, offload) < 0) {
+        return false;
+    }
+    return true;
+}
+
 void tap_fd_set_vnet_hdr_len(int fd, int len)
 {
     if (ioctl(fd, TUNSETVNETHDRSZ, &len) == -1) {