[v2] tcp: re-enable acceptance of FIN packets when RWIN is 0

[PATCH net v2 0/2] tcp: re-enable acceptance of FIN packets when RWIN is 0

Simon Baatz via B4 Relay posted 2 patches 1 month, 3 weeks ago

Diff against v1
Download series mbox

net/ipv4/tcp_input.c                               | 18 +++++++++++----
.../net/packetdrill/tcp_rcv_zero_wnd_fin.pkt       | 27 ++++++++++++++++++++++
2 files changed, 41 insertions(+), 4 deletions(-)

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[PATCH net v2 0/2] tcp: re-enable acceptance of FIN packets when RWIN is 0

Posted by Simon Baatz via B4 Relay 1 month, 3 weeks ago

Hi,

this series restores the ability to accept in‑sequence FIN packets 
even when the advertised receive window is zero, and adds a 
packetdrill test to guard the behavior.

Signed-off-by: Simon Baatz <gmbnomis@gmail.com>
---
Changes in v2:
- Move the FIN handling out of the default execution path as suggested by Eric Dumazet
- Link to v1: https://lore.kernel.org/r/20260222-fix_zero_wnd_fin-v1-0-5f4034952f3c@gmail.com

---
Simon Baatz (2):
      tcp: re-enable acceptance of FIN packets when RWIN is 0
      selftests/net: packetdrill: Verify acceptance of FIN packets when RWIN is 0

 net/ipv4/tcp_input.c                               | 18 +++++++++++----
 .../net/packetdrill/tcp_rcv_zero_wnd_fin.pkt       | 27 ++++++++++++++++++++++
 2 files changed, 41 insertions(+), 4 deletions(-)
---
base-commit: d4f687fbbce45b5e88438e89b5e26c0c15847992
change-id: 20260221-fix_zero_wnd_fin-d1ba11cd3b07

Best regards,
-- 
Simon Baatz <gmbnomis@gmail.com>