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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>
This commit is contained in:
Nandita Dukkipati 2010-12-03 13:33:44 +00:00 committed by David S. Miller
parent ce9aeb583a
commit b1afde60f2
1 changed files with 4 additions and 5 deletions
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9
net/ipv4/tcp_output.c
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@ -231,11 +231,10 @@ void tcp_select_initial_window(int __space, __u32 mss,
/* when initializing use the value from init_rcv_wnd /* when initializing use the value from init_rcv_wnd
* rather than the default from above * rather than the default from above
*/ */
if (init_rcv_wnd && if (init_rcv_wnd)
(*rcv_wnd > init_rcv_wnd * mss)) *rcv_wnd = min(*rcv_wnd, init_rcv_wnd * mss);
*rcv_wnd = init_rcv_wnd * mss; else
else if (*rcv_wnd > init_cwnd * mss) *rcv_wnd = min(*rcv_wnd, init_cwnd * mss);
*rcv_wnd = init_cwnd * mss;
} }
/* Set the clamp no higher than max representable value */ /* Set the clamp no higher than max representable value */