From: Simon Baatz <[email protected]> If we or our peer do not support window scaling in an active or passive open, we must restrict rcv_wnd to 65535.
Signed-off-by: Simon Baatz <[email protected]> --- .../packetdrill/tcp_rcv_wnd_active_no_scaling.pkt | 27 +++++++++++++++++++ .../tcp_rcv_wnd_active_peer_no_scaling.pkt | 26 +++++++++++++++++++ .../packetdrill/tcp_rcv_wnd_passive_no_scaling.pkt | 30 ++++++++++++++++++++++ .../tcp_rcv_wnd_passive_peer_no_scaling.pkt | 29 +++++++++++++++++++++ 4 files changed, 112 insertions(+) diff --git a/tools/testing/selftests/net/packetdrill/tcp_rcv_wnd_active_no_scaling.pkt b/tools/testing/selftests/net/packetdrill/tcp_rcv_wnd_active_no_scaling.pkt new file mode 100644 index 0000000000000..d39f834299fec --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_rcv_wnd_active_no_scaling.pkt @@ -0,0 +1,27 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// If we do not support window scaling in an active open, we must +// restrict rcv_wnd to 65535. + +`./defaults.sh +sysctl -q net.ipv4.tcp_window_scaling=0` + + 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 4 + +0 setsockopt(4, SOL_SOCKET, SO_RCVBUF, [256000], 4) = 0 + + +0...0 connect(4, ..., ...) = 0 + +0 > S 0:0(0) win 65535 <mss 1460,sackOK,TS val 0 ecr 0> + +0 < S. 0:0(0) ack 1 win 65535 + +0 > . 1:1(0) ack 1 + + +0 send(4, ..., 1000, 0) = 1000 + +0 > P. 1:1001(1000) ack 1 +// Beyond window ACK is dropped, causing an immediate ACK + +0 < . 65537:65537(0) ack 1001 win 65535 + +0 > . 1001:1001(0) ack 1 + + +.1 %{ assert tcpi_bytes_acked == 1, tcpi_bytes_acked; }% + +// In window ACK is accepted + +0 < . 65536:65536(0) ack 1001 win 65535 + +.1 %{ assert tcpi_bytes_acked == 1001, tcpi_bytes_acked; }% diff --git a/tools/testing/selftests/net/packetdrill/tcp_rcv_wnd_active_peer_no_scaling.pkt b/tools/testing/selftests/net/packetdrill/tcp_rcv_wnd_active_peer_no_scaling.pkt new file mode 100644 index 0000000000000..a212945996e85 --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_rcv_wnd_active_peer_no_scaling.pkt @@ -0,0 +1,26 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// If the peer does not support window scaling in an active open, we must +// restrict rcv_wnd to 65535. + +`./defaults.sh` + + 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 4 + +0 setsockopt(4, SOL_SOCKET, SO_RCVBUF, [256000], 4) = 0 + + +0...0 connect(4, ..., ...) = 0 + +0 > S 0:0(0) win 65535 <mss 1460,sackOK,TS val 0 ecr 0,nop,wscale 2> + +0 < S. 0:0(0) ack 1 win 65535 + +0 > . 1:1(0) ack 1 + + +0 send(4, ..., 1000, 0) = 1000 + +0 > P. 1:1001(1000) ack 1 +// Beyond window ACK is dropped, causing an immediate ACK + +0 < . 65537:65537(0) ack 1001 win 65535 + +0 > . 1001:1001(0) ack 1 + + +.1 %{ assert tcpi_bytes_acked == 1, tcpi_bytes_acked; }% + +// In window ACK is accepted + +0 < . 65536:65536(0) ack 1001 win 65535 + +.1 %{ assert tcpi_bytes_acked == 1001, tcpi_bytes_acked; }% diff --git a/tools/testing/selftests/net/packetdrill/tcp_rcv_wnd_passive_no_scaling.pkt b/tools/testing/selftests/net/packetdrill/tcp_rcv_wnd_passive_no_scaling.pkt new file mode 100644 index 0000000000000..907d452afc311 --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_rcv_wnd_passive_no_scaling.pkt @@ -0,0 +1,30 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// If we do not support window scaling in a passive open, we must +// restrict rcv_wnd to 65535. + +`./defaults.sh +sysctl -q net.ipv4.tcp_window_scaling=0` + + 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 + +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 + +0 setsockopt(3, SOL_SOCKET, SO_RCVBUF, [256000], 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 65535 <mss 1460> + +0 < . 1:1(0) ack 1 win 32792 + + +0 accept(3, ..., ...) = 4 + +0 send(4, ..., 1000, 0) = 1000 + +0 > P. 1:1001(1000) ack 1 +// Beyond window ACK is dropped, causing an immediate ACK + +0 < . 65537:65537(0) ack 1001 win 32792 + +0 > . 1001:1001(0) ack 1 + + +.1 %{ assert tcpi_bytes_acked == 0, tcpi_bytes_acked; }% + +// In window ACK is accepted + +0 < . 65536:65536(0) ack 1001 win 32792 + +.1 %{ assert tcpi_bytes_acked == 1000, tcpi_bytes_acked; }% diff --git a/tools/testing/selftests/net/packetdrill/tcp_rcv_wnd_passive_peer_no_scaling.pkt b/tools/testing/selftests/net/packetdrill/tcp_rcv_wnd_passive_peer_no_scaling.pkt new file mode 100644 index 0000000000000..df88dd9b6f83e --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_rcv_wnd_passive_peer_no_scaling.pkt @@ -0,0 +1,29 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// If the peer does not support window scaling in a passive open, we must +// restrict rcv_wnd to 65535. + +`./defaults.sh` + + 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 + +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 + +0 setsockopt(3, SOL_SOCKET, SO_RCVBUF, [256000], 4) = 0 + +0 bind(3, ..., ...) = 0 + +0 listen(3, 1) = 0 + + +0 < S 0:0(0) win 32792 <mss 1000> + +0 > S. 0:0(0) ack 1 win 65535 <mss 1460> + +0 < . 1:1(0) ack 1 win 32792 + + +0 accept(3, ..., ...) = 4 + +0 send(4, ..., 1000, 0) = 1000 + +0 > P. 1:1001(1000) ack 1 +// Beyond window ACK is dropped, causing an immediate ACK + +0 < . 65537:65537(0) ack 1001 win 32792 + +0 > . 1001:1001(0) ack 1 + + +.1 %{ assert tcpi_bytes_acked == 0, tcpi_bytes_acked; }% + +// In window ACK is accepted + +0 < . 65536:65536(0) ack 1001 win 32792 + +.1 %{ assert tcpi_bytes_acked == 1000, tcpi_bytes_acked; }% -- 2.53.0
