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tcp: avoid overflow of the advertised window with window scaling enabled

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tcp_segment_header.advertised_window is 16 bits.

Previously, instead of using the maximum window, zero would be sent, thus
the partner wouldn't send anything.

fix #18337

Change-Id: Ibff98ee58b84bdf52527a7821648a5faf20c5589
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6359
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: Adrien Destugues <[email protected]>
This commit is contained in:
Jérôme Duval
2023-04-16 18:53:41 +00:00
committed by waddlesplash
parent 7bfc9c6fc7
commit 7c58a5a3fb
1 changed files with 2 additions and 3 deletions
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src/add-ons/kernel/network/protocols/tcp/TCPEndpoint.cpp
+2 -3
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@@ -2067,9 +2067,8 @@ TCPEndpoint::_SendQueued(bool force, uint32 sendWindow)
availableBytes = (fReceiveMaxAdvertised - fReceiveNext).Number();
if (fFlags & FLAG_OPTION_WINDOW_SCALE)
segment.advertised_window = availableBytes >> fReceiveWindowShift;
else
segment.advertised_window = min_c(TCP_MAX_WINDOW, availableBytes);
availableBytes >>= fReceiveWindowShift;
segment.advertised_window = min_c(TCP_MAX_WINDOW, availableBytes);
segment.acknowledge = fReceiveNext.Number();