1 files changed, 7 insertions, 0 deletions

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 21bae9afefea..5901010fad55 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2236,6 +2236,13 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
                         tp->thin_lto = val;
                 break;
 
+        case TCP_THIN_DUPACK:
+                if (val < 0 || val > 1)
+                        err = -EINVAL;
+                else
+                        tp->thin_dupack = val;
+                break;
+
         case TCP_CORK:
                 /* When set indicates to always queue non-full frames.
                  * Later the user clears this option and we transmit