Endpoint identity documented the IPv6 scope identifier as an established
component alongside family, address and port. The server specification does
list the zone, but its remaining-unknowns section records that multi-zone
behavior could not be tested on a single-host platform, so no evidence settles
how a reference server compares scoped addresses. Presenting the choice as
verified compatibility overstated what is known, which the crate's own guidance
forbids.
Say what it is instead: a deliberate policy taken under a recorded unknown. Two
peers reachable at the same link-local address in different zones are genuinely
different peers, so treating the zone as identity is the conservative reading —
the failure it prevents is one peer closing another's session, and the failure
it risks is a scoped client having to reopen. The excluded flow label is
labelled the same way, and `irtt-server` guidance now carries the rule so the
echo slice reuses this comparison rather than inventing a second one.
Behavior is unchanged; this is documentation and a test comment.
Add `irtt-server` with the deterministic protocol and session engine the
upcoming Tokio runtime will call. `ServerCore::handle_datagram` takes a source
endpoint and the bytes of one datagram and returns the bytes to send back, or
nothing. It performs no I/O and keeps no clock, so every decision is a pure
function of its state and that input apart from drawing session tokens.
Rejection is silence. The protocol defines no error reply, no reset and no
NACK, so malformed, unauthenticated and policy-refused datagrams are discarded
without a response and without disturbing any live session; a client tells
"rejected" from "lost" only by timing out. `ServerError` is reserved for
internal failures on the server's own side, so an inbound `ProtoError` never
surfaces as a server failure.
Open handling authenticates before decoding parameters, so a packet that fails
authentication is discarded without parsing untrusted data and no reply
behavior reveals which stage rejected it. Duration and Interval are accepted
when absent and rejected when explicitly present and not positive, which is
what the presence-aware parameter decode is for. Negotiation currently rewrites
only the protocol version; the restriction knobs the specification describes
are deliberately left for their own slices, with one obvious place to add them.
Sessions are bounded to a finite default. A single unauthenticated datagram
creates one and opens are never deduplicated, so an unbounded table is a
liability rather than a compatibility feature; upstream's absence of session
bounds is explicitly not a target. A full table drops new opens silently and
evicts nothing. No-test opens keep working at capacity because they create no
state.
Session tokens come from the operating system's random source, since a token is
the only thing standing between an off-path attacker and a usable session on an
unauthenticated server. A drawn value that is zero or collides with a live
session is redrawn within a finite budget; there is no predictable fallback,
and a colliding token never overwrites the session that holds it. The reply is
encoded before the session is inserted, so an internal failure cannot leave a
half-created session behind.
Echo and close requests pass admission and are then deliberately ignored: this
slice creates sessions, and lifecycle and receive semantics belong to the
slices that implement them. Tests pin that so a half-implemented lifecycle
cannot appear by accident.
Nils Andreas Svee