From: Simon Baatz <[email protected]> This test verifies the sequence number checks using the maximum advertised window sequence number when we accept a packet going beyond any window that was ever advertised (i.e. rcv_nxt advances beyond rcv_mwnd_seq).
Signed-off-by: Simon Baatz <[email protected]> --- .../packetdrill/tcp_rcv_toobig_back_to_back.pkt | 27 ++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/tools/testing/selftests/net/packetdrill/tcp_rcv_toobig_back_to_back.pkt b/tools/testing/selftests/net/packetdrill/tcp_rcv_toobig_back_to_back.pkt new file mode 100644 index 0000000000000000000000000000000000000000..4d4c33d248948d3dfaf9b0c5b243ed27321e9b10 --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_rcv_toobig_back_to_back.pkt @@ -0,0 +1,27 @@ +// SPDX-License-Identifier: GPL-2.0 + +--mss=1000 + +`./defaults.sh` + +// Establish a connection. + +0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 + +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 + +0 setsockopt(3, SOL_SOCKET, SO_RCVBUF, [20000], 4) = 0 + +0 bind(3, ..., ...) = 0 + +0 listen(3, 1) = 0 + + +0 < S 0:0(0) win 32792 <mss 1000,nop,wscale 7> + +0 > S. 0:0(0) ack 1 win 18980 <mss 1460,nop,wscale 0> + +.1 < . 1:1(0) ack 1 win 257 + + +0 accept(3, ..., ...) = 4 + +// A too big packet is accepted if the receive queue is empty + +0 < P. 1:20001(20000) ack 1 win 257 +// Send a RST immediately so that there is no rcv_wup/rcv_mwnd_seq update yet + +0 < R. 20001:20001(0) ack 1 win 257 +// * > . 1:1(0) ack 20001 win 18000 + + +.1 %{ assert tcpi_state == TCP_CLOSE, tcpi_state }% + -- 2.52.0
