smoltcp

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History

Hugh 816a4f96c5 tcp: send challenge ACK for duplicate ACK in LAST-ACK

Per RFC 9293 §3.10.7.4, the only acceptable segment in LAST-ACK is an
acknowledgement of the local FIN. When a duplicate or stale ACK arrived
(ack_len == 0, ack_of_fin == false), smoltcp returned None with no
response, leaving the remote without feedback on the current sequence
state.

Add an else-if branch in the (State::LastAck, TcpControl::None) arm
that returns a challenge ACK via the existing challenge_ack_reply path.
This is symmetric with the handling for ACKs that exceed SND.NXT.
A partial ACK (ack_len > 0, ack_of_fin == false) is left on the
normal path so SND.UNA advances and the FIN is retransmitted by the
timer.

Fixes #1060

2026-03-04 18:58:17 -08:00

iface

iface: Remove redundant any IP checks

2026-02-03 14:14:13 +01:00

phy

docs(pcap_writer): remove outdated information

2026-02-19 15:49:44 +01:00

socket

tcp: send challenge ACK for duplicate ACK in LAST-ACK

2026-03-04 18:58:17 -08:00

storage

Cargo fmt.