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tcp: avoid rcv wnd less than mss

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Type: fix

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: I84ec1c91a3a7b2195aad58923fa6f17f551444cb
(cherry picked from commit f2fe353cc829f2074d63ebba9bb3b25e5ceb20af)
This commit is contained in:
Florin Coras 2020-05-08 16:23:38 +00:00 committed by Andrew Yourtchenko
parent f812f51873
commit a316c17d9e
1 changed files with 4 additions and 6 deletions
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10
src/vnet/tcp/tcp_output.c
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@ -144,13 +144,11 @@ tcp_update_rcv_wnd (tcp_connection_t * tc)
wnd = available_space;
}
/* Make sure we have a multiple of rcv_wscale */
/* Make sure we have a multiple of 1 << rcv_wscale. We round up to
* avoid advertising a window less than mss which could happen if
* 1 << rcv_wscale < mss */
if (wnd && tc->rcv_wscale)
{
wnd &= ~((1 << tc->rcv_wscale) - 1);
if (wnd == 0)
wnd = 1 << tc->rcv_wscale;
}
wnd = round_pow2 (wnd, 1 << tc->rcv_wscale);
tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale);
}