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Diffstat (limited to 'src/vnet/tcp/tcp_output.c')
-rw-r--r--src/vnet/tcp/tcp_output.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c
index 7cee34995e3..113fb148c37 100644
--- a/src/vnet/tcp/tcp_output.c
+++ b/src/vnet/tcp/tcp_output.c
@@ -126,7 +126,10 @@ tcp_initial_window_to_advertise (tcp_connection_t * tc)
* scale to be computed in the same way */
max_fifo = tm->max_rx_fifo ? tm->max_rx_fifo : TCP_MAX_RX_FIFO_SIZE;
- tc->rcv_wscale = tcp_window_compute_scale (max_fifo);
+ /* Compute rcv wscale only if peer advertised support for it */
+ if (tc->state != TCP_STATE_SYN_RCVD || tcp_opts_wscale (&tc->rcv_opts))
+ tc->rcv_wscale = tcp_window_compute_scale (max_fifo);
+
tc->rcv_wnd = tcp_initial_wnd_unscaled (tc);
return clib_min (tc->rcv_wnd, TCP_WND_MAX);