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Introduce crates/rib (netcalyx-rib): sync only, no tokio, no lookup or ingestion yet. - types: TableId/RibContext (per-VRF table addressing, RD-normalized the same way for every consumer), AfiSafiType (RFC 4760 AFI/SAFI identities), LabeledRouteExtra/Srv6RouteExtra (MPLS/SRv6 forwarding info carried per route). - attrs: RouteAttributes (flattened path attributes) and AttrStore, which interns both sub-components (AS-path, communities, cluster list, ...) and whole attribute sets, so a full table's worth of routes share Arc'd attribute sets instead of duplicating them per route. - model: RibStore -> RouterRib -> AfiSafiTable -> AfiSafiRib, the five RIB views per table (loc-rib plus the four adj-ribs) held per peer in PeerRibs, and Route/MultiRoute for per-prefix path storage (best-path selection, ECMP, path status). Arc-per-trie copy-on-write: a write after a snapshot publish clones only the one trie it touches, not the whole router. - peers: a flow's next-hop is an address, but BMP identifies a peer by a five-field tuple; PeerIndex resolves address -> peer within one RIB context in O(1) instead of scanning every peer in a table. peer_identity() normalizes RD the same way RibContext does, so inconsistent RD reporting can't split one peer's adj-rib in two. Lookup (LPM) and BMP ingestion are intentionally out of scope here, landing as separate follow-up PRs. Add docs/rib_structure.md: hierarchy sketch and copy-on-write lifecycle walkthrough for the new crate.
Add `lookup::lookup()`, resolving one address against `(RibContext, AfiSafiType[, RouteDistinguisher])` targets into the active path of the first RIB view with a hit, trying `loc-rib` then the four adj-ribs in precedence order (overridable via `LookupRequest::view_order`). Adj-rib reads resolve the flow's neighbor address to a peer through `PeerAddrIndex`; ambiguous or absent neighbors fall back to the lowest `(peer_address, bgp_id)` among matching peers, deterministically. Consolidate the `(post_policy, adj_rib_out) -> view` mapping, which previously existed independently in three places, into `RibView::from_peer_flags` plus `PeerRibs::view()`/`view_mut()` as the single source of truth; `adj_rib_view_mut` and `lookup` both delegate to it now.
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This PR depends on #57
Adds the read path on top of the
netcalyx-ribdata model landedin #57 : resolving an address to its best-matching route across a
router's RIB views.
Reason
Flow enrichment and other consumers need to resolve an address
(e.g. flow src/dst) into path attributes and forwarding info.
Changelog
lookup::lookup(): LPM lookup against one or moreLookupTargets (context + AFI-SAFI + optional RD), trying RIBviews in precedence order (
loc-ribfirst, then the fouradj-ribs,
DEFAULT_VIEW_ORDERor a caller-supplied order). Returnsa
Matchwith the active path's attributes/forwarding info, theview that answered, and the peer that answered (
Noneforloc-rib).
PeerIndexbefore reading an adj-rib view; fall back to the lowest
(peer_address, bgp_id)among matching peers when the neighbor isambiguous or absent.
lookup.rs; 50 tests pass overall for the crate.