1 files changed, 26 insertions, 0 deletions
diff --git a/net/tap-linux.c b/net/tap-linux.c
index 0059404069..b6f1fad5e4 100644
--- a/net/tap-linux.c
+++ b/net/tap-linux.c
@@ -111,3 +111,29 @@ int tap_probe_vnet_hdr(int fd)
 
     return ifr.ifr_flags & IFF_VNET_HDR;
 }
+
+void tap_fd_set_offload(int fd, int csum, int tso4,
+                        int tso6, int ecn, int ufo)
+{
+    unsigned int offload = 0;
+
+    if (csum) {
+        offload |= TUN_F_CSUM;
+        if (tso4)
+            offload |= TUN_F_TSO4;
+        if (tso6)
+            offload |= TUN_F_TSO6;
+        if ((tso4 || tso6) && ecn)
+            offload |= TUN_F_TSO_ECN;
+        if (ufo)
+            offload |= TUN_F_UFO;
+    }
+
+    if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
+        offload &= ~TUN_F_UFO;
+        if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
+            fprintf(stderr, "TUNSETOFFLOAD ioctl() failed: %s\n",
+                    strerror(errno));
+        }
+    }
+}