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Message-ID: <20260105172529.3514786-1-willemdebruijn.kernel@gmail.com> Date: Mon, 5 Jan 2026 12:25:02 -0500 From: Willem de Bruijn <willemdebruijn.kernel@...il.com> To: netdev@...r.kernel.org Cc: davem@...emloft.net, kuba@...nel.org, edumazet@...gle.com, pabeni@...hat.com, horms@...nel.org, ncardwell@...gle.com, kuniyu@...gle.com, Willem de Bruijn <willemb@...gle.com> Subject: [PATCH net-next] selftests/net: packetdrill: add minimal client and server tests From: Willem de Bruijn <willemb@...gle.com> Introduce minimal tests. These can serve as simple illustrative examples, and as templates when writing new tests. When adding new cases, it can be easier to extend an existing base test rather than start from scratch. The existing tests all focus on real, often non-trivial, features. It is not obvious which to take as starting point, and arguably none really qualify. Add two tests - the client test performs the active open and initial close - the server test implements the passive open and final close Signed-off-by: Willem de Bruijn <willemb@...gle.com> --- .../net/packetdrill/tcp_basic_client.pkt | 24 +++++++++++++ .../net/packetdrill/tcp_basic_server.pkt | 35 +++++++++++++++++++ 2 files changed, 59 insertions(+) create mode 100644 tools/testing/selftests/net/packetdrill/tcp_basic_client.pkt create mode 100644 tools/testing/selftests/net/packetdrill/tcp_basic_server.pkt diff --git a/tools/testing/selftests/net/packetdrill/tcp_basic_client.pkt b/tools/testing/selftests/net/packetdrill/tcp_basic_client.pkt new file mode 100644 index 000000000000..319f81dd717d --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_basic_client.pkt @@ -0,0 +1,24 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Minimal active open. +// First to close connection. + +`./defaults.sh` + + 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 4 + + // Connect to server: active open: three-way handshake + +0...0 connect(4, ..., ...) = 0 + +0 > S 0:0(0) <mss 1460,sackOK,TS val 0 ecr 0,nop,wscale 8> + +0 < S. 0:0(0) ack 1 win 65535 <mss 1460,sackOK,nop,nop,nop,wscale 7> + +0 > . 1:1(0) ack 1 + + // Send data + +0 send(4, ..., 1000, 0) = 1000 + +0 > P. 1:1001(1000) ack 1 + +0 < . 1:1(0) ack 1001 win 257 + + +0 close(4) = 0 + +0 > F. 1001:1001(0) ack 1 + +0 < F. 1:1(0) ack 1002 win 257 + +0 > . 1002:1002(0) ack 2 diff --git a/tools/testing/selftests/net/packetdrill/tcp_basic_server.pkt b/tools/testing/selftests/net/packetdrill/tcp_basic_server.pkt new file mode 100644 index 000000000000..e72a291b666e --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_basic_server.pkt @@ -0,0 +1,35 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Minimal passive open. +// Peer is first to close. + +`./defaults.sh` + + // Open listener socket + 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 + + // Incoming connection: passive open: three-way handshake + +0 < S 0:0(0) win 65535 <mss 1000,sackOK,nop,nop,nop,wscale 8> + +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8> + +0 < . 1:1(0) ack 1 win 257 + + // Open connection socket and close listener socket + +0 accept(3, ..., ...) = 4 + +0 close(3) = 0 + + // Peer sends data: acknowledge and receive + +0 < P. 1:1001(1000) ack 1 win 257 + +0 > . 1:1(0) ack 1001 + +0 recv(4, ..., 1000, 0) = 1000 + + // Peer initiates connection close + +0 < F. 1001:1001(0) ack 1 win 257 + +.04 > . 1:1(0) ack 1002 + + // Local socket also closes its side + +0 close(4) = 0 + +0 > F. 1:1(0) ack 1002 + +0 < . 1002:1002(0) ack 2 win 257 -- 2.52.0.351.gbe84eed79e-goog
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