From: Simon Baatz <[email protected]> Add a packetdrill test to verify that setting SO_RCVLOWAT does not raise window_clamp beyond the maximum value allowed by window scaling.
Signed-off-by: Simon Baatz <[email protected]> --- .../net/packetdrill/tcp_rcv_sockopt_lowat.pkt | 24 ++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/tools/testing/selftests/net/packetdrill/tcp_rcv_sockopt_lowat.pkt b/tools/testing/selftests/net/packetdrill/tcp_rcv_sockopt_lowat.pkt new file mode 100644 index 0000000000000..c024f3953f5a4 --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_rcv_sockopt_lowat.pkt @@ -0,0 +1,24 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Verify that setting SO_RCVLOWAT does not set window_clamp higher than the +// maximum value allowed by window scaling. +--mss=1000 + +`./defaults.sh` + +// Initialize connection + 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 + +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 + +0 bind(3, ..., ...) = 0 + +0 listen(3, 1) = 0 + + +0 < S 0:0(0) win 32792 + +0 > S. 0:0(0) ack 1 win 65535 <mss 1460> + +0 < . 1:1(0) ack 1 win 32792 + + +0 accept(3, ..., ...) = 4 + + +0 getsockopt(4, IPPROTO_TCP, 10, [65535], [4]) = 0 // TCP_WINDOW_CLAMP == 10 + +0 setsockopt(4, SOL_SOCKET, SO_RCVLOWAT, [1024000], 4) = 0 + +0 getsockopt(4, SOL_SOCKET, SO_RCVLOWAT, [1024000], [4]) = 0 + +0 getsockopt(4, IPPROTO_TCP, 10, [65535], [4]) = 0 -- 2.53.0
