On Mon, Sep 14, 2026 at 2:04 AM Inbal Schussheim <[email protected]> wrote: > > Add a packetdrill test for an in-sequence data segment carrying an > excessively old ACK. > > Verify that the segment falls through from the TCP fast path to the slow > path, where the existing ACK validation rejects it and sends a challenge > ACK. The payload is not accepted and RCV.NXT remains unchanged. > > Based on the reproducer from Commit 3d501dd326fb > ("tcp: do not accept ACK of bytes we never sent"). > > Signed-off-by: Inbal Schussheim <[email protected]>
Reviewed-by: Eric Dumazet <[email protected]>
