[DCCP]: Sample RTT from SYN exchange

Function:

1 files changed, 8 insertions, 0 deletions

diff --git a/net/dccp/input.c b/net/dccp/input.c
index bd578c87b2e..da6ec185ed5 100644
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -300,6 +300,14 @@ static int dccp_rcv_request_sent_state_process(struct sock *sk,
                 if (dccp_parse_options(sk, skb))
                         goto out_invalid_packet;
 
+                /* Obtain RTT sample from SYN exchange (used by CCID 3) */
+                if (dp->dccps_options_received.dccpor_timestamp_echo) {
+                        struct timeval now;
+
+                        dccp_timestamp(sk, &now);
+                        dp->dccps_syn_rtt = dccp_sample_rtt(sk, &now, NULL);
+                }
+
                 if (dccp_msk(sk)->dccpms_send_ack_vector &&
                     dccp_ackvec_add(dp->dccps_hc_rx_ackvec, sk,
                                     DCCP_SKB_CB(skb)->dccpd_seq,