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-rwxr-xr-xsrc/vnet/tcp/tcp_input.c26
1 files changed, 24 insertions, 2 deletions
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index de79e3e19ab..e4bd156391f 100755
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -1509,6 +1509,24 @@ tcp_cc_handle_event (tcp_connection_t * tc, tcp_rate_sample_t * rs,
tcp_cc_rcv_cong_ack (tc, TCP_CC_PARTIALACK, rs);
}
+static void
+tcp_handle_old_ack (tcp_connection_t * tc, vlib_buffer_t * b,
+ tcp_rate_sample_t * rs)
+{
+ if (!tcp_in_cong_recovery (tc))
+ return;
+
+ if (tcp_opts_sack_permitted (&tc->rcv_opts))
+ tcp_rcv_sacks (tc, vnet_buffer (b)->tcp.ack_number);
+
+ tc->bytes_acked = 0;
+
+ if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
+ tcp_bt_sample_delivery_rate (tc, rs);
+
+ tcp_cc_handle_event (tc, rs, 1);
+}
+
/**
* Check if duplicate ack as per RFC5681 Sec. 2
*/
@@ -1574,8 +1592,12 @@ tcp_rcv_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b,
tc->errors.below_ack_wnd += 1;
*error = TCP_ERROR_ACK_OLD;
TCP_EVT (TCP_EVT_ACK_RCV_ERR, tc, 1, vnet_buffer (b)->tcp.ack_number);
- if (tcp_in_fastrecovery (tc) && tc->rcv_dupacks == TCP_DUPACK_THRESHOLD)
- tcp_cc_handle_event (tc, 0, 1);
+
+ if (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una - tc->rcv_wnd))
+ return -1;
+
+ tcp_handle_old_ack (tc, b, &rs);
+
/* Don't drop yet */
return 0;
}