1 files changed, 6 insertions, 0 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 9e041fa5c545..44c09eddbb78 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2517,6 +2517,12 @@ static int __net_init tcp_sk_init(struct net *net)
                 if (res)
                         goto fail;
                 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
+
+                /* Please enforce IP_DF and IPID==0 for RST and
+                 * ACK sent in SYN-RECV and TIME-WAIT state.
+                 */
+                inet_sk(sk)->pmtudisc = IP_PMTUDISC_DO;
+
                 *per_cpu_ptr(net->ipv4.tcp_sk, cpu) = sk;
         }