tcp: initialize icsk_ack.lrcvtime at session start time

[ Upstream commit 15bb7745e94a665caf42bfaabf0ce062845b533b ]

icsk_ack.lrcvtime has a 0 value at socket creation time.

tcpi_last_data_recv can have bogus value if no payload is ever received.

This patch initializes icsk_ack.lrcvtime for active sessions
in tcp_finish_connect(), and for passive sessions in
tcp_create_openreq_child()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 28777a0307c88357e8afb78f852d6c375d5a51db..e7516efa99dc4b4e54bea5515599c1e0ce776fef 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -5571,6 +5571,7 @@ void tcp_finish_connect(struct sock *sk, struct sk_buff *skb)
        struct inet_connection_sock *icsk = inet_csk(sk);
 
        tcp_set_state(sk, TCP_ESTABLISHED);
+       icsk->icsk_ack.lrcvtime = tcp_time_stamp;
 
        if (skb) {
                icsk->icsk_af_ops->sk_rx_dst_set(sk, skb);
@@ -5789,7 +5790,6 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
                         * to stand against the temptation 8)     --ANK
                         */
                        inet_csk_schedule_ack(sk);
-                       icsk->icsk_ack.lrcvtime = tcp_time_stamp;
                        tcp_enter_quickack_mode(sk);
                        inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
                                                  TCP_DELACK_MAX, TCP_RTO_MAX);

diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 28ce5ee831f59d0a66d49b27c766b396b3e62ff9..80ff517a75424c03e86839cf87922a1330e6c14d 100644 (file)
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -466,6 +466,7 @@ struct sock *tcp_create_openreq_child(const struct sock *sk,
                newtp->mdev_us = jiffies_to_usecs(TCP_TIMEOUT_INIT);
                minmax_reset(&newtp->rtt_min, tcp_time_stamp, ~0U);
                newicsk->icsk_rto = TCP_TIMEOUT_INIT;
+               newicsk->icsk_ack.lrcvtime = tcp_time_stamp;
 
                newtp->packets_out = 0;
                newtp->retrans_out = 0;