Clears the cultnet half of the retained debt. The two unported commits from the
retiring GameCult/cultnet-rs lineage were not portable as patches: this lineage
had reworked the same receive path with sequence domains and ACK horizons, and
applying them raised nine conflicts that would have reverted that work. Most of
what they added already existed here by another route -- received-sequence
history, fragment-set count and reassembly bytes are all bounded already. So
the gaps were taken rather than the patches.
Three were real. The per-channel maps grew without limit, and a peer picks its
own channel ids, so ordered and sequenced channel tracking is now capped at 64
each. The out-of-order hold buffer grew without limit, and a peer picks its own
send order, so it is capped at 1024 frames and 4 MB; sizes are computed from the
buffer rather than tracked in counters, which cannot drift.
The fourth was the sharpest. remember_received ran before the duplicate
early-return, so a single forged packet far past the current highest advanced
the receive state beyond every sequence still in flight and starved the
session. Such a packet is now refused without being remembered.
Reliable sequence exhaustion aborted the process through expect(). The capacity
gate that already guards the send window now also refuses when the sequence
space cannot cover the request, and allocation saturates rather than panicking
so no future path can reintroduce the abort.
Five tests cover the bounds and both refusals. cultnet-rs passes 103,
cultcache-rs 48, cultmesh-rs 7, and the TypeScript-Rust RUDP interop lanes pass
5 of 5 with the hardened peer, so legitimate traffic is unchanged.
The parity ledger now records what this actually leaves owed: these are
refusals, not wire-format changes, so the interop lanes stay green whether or
not the other four runtimes match. The gap will not announce itself.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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