| cf94b3c0 | 22-Apr-2026 |
Jiayuan Chen <jiayuan.chen@linux.dev> |
selftests/net: packetdrill: cover RFC 5961 5.2 challenge ACK on both edges
RFC 5961 Section 5.2 / RFC 793 Section 3.9 require a challenge ACK
whenever an incoming SEG.ACK falls outside
[SND.UNA - MA
selftests/net: packetdrill: cover RFC 5961 5.2 challenge ACK on both edges
RFC 5961 Section 5.2 / RFC 793 Section 3.9 require a challenge ACK
whenever an incoming SEG.ACK falls outside
[SND.UNA - MAX.SND.WND, SND.NXT]. There is currently no packetdrill
coverage for either edge.
Add tcp_rfc5961_ack-out-of-window.pkt, which in a single passive-open
connection exercises:
- Upper edge (SEG.ACK > SND.NXT): peer ACKs data that was never
sent before the server has transmitted anything.
- Lower edge (SEG.ACK < SND.UNA - MAX.SND.WND): after the server
has sent 2000 bytes (the peer-advertised rwnd forces two 1000-byte
segments, both acknowledged), peer sends an ACK that is older
than the acceptable window.
Both cases must elicit a challenge ACK
<SEQ = SND.NXT, ACK = RCV.NXT, CTL = ACK>. The per-socket RFC 5961
Section 7 rate limit is disabled for the duration of the test so that
both challenge ACKs can fire back-to-back.
Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260422123605.320000-3-jiayuan.chen@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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| 3eb371ed | 09-Mar-2026 |
Simon Baatz <gmbnomis@gmail.com> |
selftests/net: packetdrill: add tcp_rcv_neg_window.pkt
The test ensures we correctly apply the maximum advertised window limit
when rcv_nxt advances past rcv_mwnd_seq, so that the "usable window"
is
selftests/net: packetdrill: add tcp_rcv_neg_window.pkt
The test ensures we correctly apply the maximum advertised window limit
when rcv_nxt advances past rcv_mwnd_seq, so that the "usable window"
is properly clamped to zero rather than becoming negative.
Signed-off-by: Simon Baatz <gmbnomis@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260309-tcp_rfc7323_retract_wnd_rfc-v3-6-4c7f96b1ec69@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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| ba58b3e7 | 09-Mar-2026 |
Simon Baatz <gmbnomis@gmail.com> |
selftests/net: packetdrill: add tcp_rcv_wnd_shrink_allowed.pkt
This test verifies the sequence number checks using the maximum
advertised window sequence number when net.ipv4.tcp_shrink_window
is en
selftests/net: packetdrill: add tcp_rcv_wnd_shrink_allowed.pkt
This test verifies the sequence number checks using the maximum
advertised window sequence number when net.ipv4.tcp_shrink_window
is enabled.
Signed-off-by: Simon Baatz <gmbnomis@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260309-tcp_rfc7323_retract_wnd_rfc-v3-5-4c7f96b1ec69@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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| ec1adf8e | 09-Mar-2026 |
Simon Baatz <gmbnomis@gmail.com> |
selftests/net: packetdrill: add tcp_rcv_wnd_shrink_nomem.pkt
This test verifies
- the sequence number checks using the maximum advertised window
sequence number and
- the logic for handling receiv
selftests/net: packetdrill: add tcp_rcv_wnd_shrink_nomem.pkt
This test verifies
- the sequence number checks using the maximum advertised window
sequence number and
- the logic for handling received data in tcp_data_queue()
for the cases:
1. The window is reduced to zero because of memory
2. The window grows again but still does not reach the originally
advertised window
Signed-off-by: Simon Baatz <gmbnomis@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260309-tcp_rfc7323_retract_wnd_rfc-v3-4-4c7f96b1ec69@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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| 9b62d53c | 27-Sep-2025 |
Kuniyuki Iwashima <kuniyu@google.com> |
selftest: packetdrill: Import client-ack-dropped-then-recovery-ms-timestamps.pkt
This also does not have the non-experimental version, so converted to FO.
The comment in .pkt explains the detailed
selftest: packetdrill: Import client-ack-dropped-then-recovery-ms-timestamps.pkt
This also does not have the non-experimental version, so converted to FO.
The comment in .pkt explains the detailed scenario.
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250927213022.1850048-14-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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| 05b9f505 | 27-Sep-2025 |
Kuniyuki Iwashima <kuniyu@google.com> |
selftest: packetdrill: Import sockopt-fastopen-key.pkt
sockopt-fastopen-key.pkt does not have the non-experimental
version, so the Experimental version is converted, FOEXP -> FO.
The test sets net.
selftest: packetdrill: Import sockopt-fastopen-key.pkt
sockopt-fastopen-key.pkt does not have the non-experimental
version, so the Experimental version is converted, FOEXP -> FO.
The test sets net.ipv4.tcp_fastopen_key=0-0-0-0 and instead
sets another key via setsockopt(TCP_FASTOPEN_KEY).
The first listener generates a valid cookie in response to TFO
option without cookie, and the second listner creates a TFO socket
using the valid cookie.
TCP_FASTOPEN_KEY is adjusted to use the common key in default.sh
so that we can use TFO_COOKIE and support dualstack. Similarly,
TFO_COOKIE_ZERO for the 0-0-0-0 key is defined.
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250927213022.1850048-13-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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| be90c7b3 | 27-Sep-2025 |
Kuniyuki Iwashima <kuniyu@google.com> |
selftest: packetdrill: Refine tcp_fastopen_server_reset-after-disconnect.pkt.
These changes are applied to follow the imported packetdrill tests.
* Call setsockopt(TCP_FASTOPEN)
* Remove unnece
selftest: packetdrill: Refine tcp_fastopen_server_reset-after-disconnect.pkt.
These changes are applied to follow the imported packetdrill tests.
* Call setsockopt(TCP_FASTOPEN)
* Remove unnecessary accept() delay
* Add assertion for TCP states
* Rename to tcp_fastopen_server_trigger-rst-reconnect.pkt.
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250927213022.1850048-12-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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| 21f7fb31 | 27-Sep-2025 |
Kuniyuki Iwashima <kuniyu@google.com> |
selftest: packetdrill: Import opt34/*-trigger-rst.pkt.
This imports the non-experimental version of opt34/*-trigger-rst.pkt.
| accept() | SYN data |
---------
selftest: packetdrill: Import opt34/*-trigger-rst.pkt.
This imports the non-experimental version of opt34/*-trigger-rst.pkt.
| accept() | SYN data |
-----------------------------------+----------+----------+
listener-closed-trigger-rst.pkt | no | unread |
unread-data-closed-trigger-rst.pkt | yes | unread |
Both files test that close()ing a SYN_RECV socket with unread SYN data
triggers RST.
The files are renamed to have the common prefix, trigger-rst.
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250927213022.1850048-11-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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| 5920f154 | 27-Sep-2025 |
Kuniyuki Iwashima <kuniyu@google.com> |
selftest: packetdrill: Import opt34/reset-* tests.
This imports the non-experimental version of opt34/reset-*.pkt.
| Child | RST | sk_
selftest: packetdrill: Import opt34/reset-* tests.
This imports the non-experimental version of opt34/reset-*.pkt.
| Child | RST | sk_err |
---------------------------------+---------+-------------------------------+---------+
reset-after-accept.pkt | TFO | after accept(), SYN_RECV | read() |
reset-close-with-unread-data.pkt | TFO | after accept(), SYN_RECV | write() |
reset-before-accept.pkt | TFO | before accept(), SYN_RECV | read() |
reset-non-tfo-socket.pkt | non-TFO | before accept(), ESTABLISHED | write() |
The first 3 files test scenarios where a SYN_RECV socket receives RST
before/after accept() and data in SYN must be read() without error,
but the following read() or fist write() will return ECONNRESET.
The last test is similar but with non-TFO socket.
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250927213022.1850048-10-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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