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Johnathan Corgan
60e5fefb1f
Add fips-gateway binary: a separate daemon that allows unmodified LAN hosts to reach FIPS mesh destinations via DNS-allocated virtual IPs and kernel nftables NAT. Gateway DNS resolver: forwarding proxy on [::]:53 that intercepts .fips queries, forwards to daemon resolver (localhost:5354), allocates virtual IPs from pool, returns AAAA records. Always sends AAAA upstream regardless of client query type, returns proper NODATA for non-AAAA. Virtual IP pool: fd01::/112 pool with state machine lifecycle (Allocated → Active → Draining → Free), TTL-based reclamation, conntrack integration for session tracking. NAT manager: nftables DNAT/SNAT rules via rustables netlink API, per-mapping rule lifecycle, fips0 masquerade for LAN client source address rewriting. Network setup: local pool route, proxy NDP for virtual IPs on LAN interface, IPv6 forwarding validation. Control socket at /run/fips/gateway.sock with show_gateway and show_mappings queries. fipstop Gateway tab with pool summary gauge and mappings table. Gateway config section in fips.yaml with pool CIDR, LAN interface, DNS upstream, TTL, and grace period settings. Design doc at docs/design/fips-gateway.md. Integration test (testing/static/scripts/gateway-test.sh): three containers verifying DNS resolution, end-to-end HTTP, NAT state, TTL expiration, SERVFAIL fallback, and clean shutdown.
FIPS Design Documents
Protocol design specifications for the Federated Interoperable Peering System — a self-organizing encrypted mesh network built on Nostr identities.
Reading Order
Start with the introduction, then follow the protocol stack from bottom to top. After the stack, the mesh operation document explains how all the pieces work together. Supporting references provide deeper dives into specific topics.
Protocol Stack
| Document | Description |
|---|---|
| fips-intro.md | Protocol introduction: goals, architecture, layer model |
| fips-transport-layer.md | Transport layer: datagram delivery over arbitrary media |
| fips-mesh-layer.md | FIPS Mesh Protocol (FMP): peer authentication, link encryption, forwarding |
| fips-session-layer.md | FIPS Session Protocol (FSP): end-to-end encryption, sessions |
| fips-ipv6-adapter.md | IPv6 adaptation: TUN interface, DNS, MTU enforcement |
Mesh Behavior
| Document | Description |
|---|---|
| fips-mesh-operation.md | How the mesh operates: routing, discovery, error recovery |
| fips-wire-formats.md | Wire format reference for all message types |
Supporting References
| Document | Description |
|---|---|
| fips-spanning-tree.md | Spanning tree algorithms: root discovery, parent selection, coordinates |
| fips-bloom-filters.md | Bloom filter math: FPR analysis, size classes, split-horizon |
Implementation
| Document | Description |
|---|---|
| fips-configuration.md | YAML configuration reference |
Supplemental
| Document | Description |
|---|---|
| spanning-tree-dynamics.md | Spanning tree walkthroughs: convergence scenarios, worked examples |
Document Relationships
