tcp: Bug fix in initialization of receive window.

The bug has to do with boundary checks on the initial receive window.
If the initial receive window falls between init_cwnd and the
receive window specified by the user, the initial window is incorrectly
brought down to init_cwnd. The correct behavior is to allow it to
remain unchanged.

Signed-off-by: Nandita Dukkipati <nanditad@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 05b1ecf..3c59ab4 100644 (file)
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -231,11 +231,10 @@ void tcp_select_initial_window(int __space, __u32 mss,
                /* when initializing use the value from init_rcv_wnd
                 * rather than the default from above
                 */
-               if (init_rcv_wnd &&
-                   (*rcv_wnd > init_rcv_wnd * mss))
-                       *rcv_wnd = init_rcv_wnd * mss;
-               else if (*rcv_wnd > init_cwnd * mss)
-                       *rcv_wnd = init_cwnd * mss;
+               if (init_rcv_wnd)
+                       *rcv_wnd = min(*rcv_wnd, init_rcv_wnd * mss);
+               else
+                       *rcv_wnd = min(*rcv_wnd, init_cwnd * mss);
        }
 
        /* Set the clamp no higher than max representable value */