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999144f59a
FIPS_OVERHEAD was 150 but had two bugs: the session AEAD tag (16 bytes) was listed in the comment but missing from the arithmetic, and the coordinate budget (~60 bytes) was undersized and didn't belong in a constant representing fixed data path overhead. Corrected to 106 bytes (the actual fixed overhead without coordinates). This increases effective_ipv6_mtu from 1322 to 1366 for standard Ethernet, well above the IPv6 minimum of 1280. Added a guard in send_session_data() that computes the total wire size with coordinates before committing to include them. If adding coords would exceed the transport MTU, the CP flag is skipped and the warmup counter is not decremented. This prevents silently producing oversized packets at tree depth 2+. Updated design docs (ipv6-adapter, wire-formats, mesh-operation) with corrected overhead values.
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-link-layer.md | FIPS Link Protocol (FLP): 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 election, parent selection, coordinates |
| fips-bloom-filters.md | Bloom filter math: FPR analysis, size classes, split-horizon |
Implementation
| Document | Description |
|---|---|
| fips-software-architecture.md | Stable architectural decisions guiding the codebase |
| fips-state-machines.md | Phase-based state machine pattern (Rust enum-of-structs) |
| fips-configuration.md | YAML configuration reference |
Supplemental
| Document | Description |
|---|---|
| spanning-tree-dynamics.md | Spanning tree walkthroughs: convergence scenarios, worked examples |
Document Relationships
fips-intro.md
│
┌──────────────┼──────────────┐
▼ ▼ ▼
fips-transport-layer fips-mesh- fips-software-
│ operation architecture
▼ │ │
fips-link-layer ◄────────┤ ▼
│ │ fips-state-machines
▼ │
fips-session-layer ├──► fips-spanning-tree
│ │ │
▼ └──► fips-bloom-filters
fips-ipv6-adapter
fips-wire-formats
(referenced by all layer docs)
fips-configuration
(standalone reference)
spanning-tree-dynamics
(pedagogical companion to fips-spanning-tree)