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Design documentation illustration pass and FLP→FMP rename

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Rename FIPS Link Protocol (FLP) to FIPS Mesh Protocol (FMP)

  The "Link Protocol" name understated the layer's scope — spanning tree
  construction, bloom filter routing, greedy forwarding, and mesh-wide
  coordination go well beyond link-level concerns. Rename fips-link-layer.md
  to fips-mesh-layer.md, update FLP→FMP throughout docs and source code
  (FLP_VERSION→FMP_VERSION, wire.rs, rx_loop.rs, spanning_tree.rs).

New SVG illustrations

  - Protocol stack: color-coded layer diagram replacing ASCII art
  - OSI mapping: side-by-side comparison with traditional networking layers
  - Bloom filter propagation: 6-node tree with sender-colored filter boxes
    showing split-horizon computation per link
  - Routing decision flowchart: 5-step priority chain with candidate ranking
    by tree distance and link performance
  - Coordinate discovery: sequence diagram showing LookupRequest propagation,
    response caching, and SessionSetup cache warming

Redesigned existing SVGs

  - Architecture overview: uniform node layout, U-shaped encrypted link
    connectors, separate end-to-end session line
  - Node architecture: split Router Core into FSP and FMP layers, reorganize
    transports into Overlay/Shared Medium/Point-to-Point categories
  - Identity derivation: wider boxes, visible encode arrow, dashed npub line

fips-intro.md revisions

  - Add inline references to prior work: Yggdrasil/Ironwood for coordinate
    routing, Noise Protocol Framework for IK handshakes, WireGuard for
    index-based session dispatch, Wikipedia for bloom filters, split-horizon,
    and greedy embedding
  - Add explanatory paragraphs after bloom filter diagram describing
    split-horizon filter computation and candidate selection behavior
  - Simplify transport abstraction language, remove I2P/LoRa references
  - Fix LookupRequest wording ("propagates" not "floods"), note intermediate
    node coordinate caching on lookup responses
  - Rewrite architecture overview prose to match redesigned diagrams
This commit is contained in:
Johnathan Corgan
2026-02-21 22:05:44 +00:00
parent 19efe06622
commit 0a72317b59
27 changed files with 997 additions and 502 deletions
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4
docs/design/README.md
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@@ -16,7 +16,7 @@ specific topics.
| -------- | ----------- |
| [fips-intro.md](fips-intro.md) | Protocol introduction: goals, architecture, layer model |
| [fips-transport-layer.md](fips-transport-layer.md) | Transport layer: datagram delivery over arbitrary media |
| [fips-link-layer.md](fips-link-layer.md) | FIPS Link Protocol (FLP): peer authentication, link encryption, forwarding |
| [fips-mesh-layer.md](fips-mesh-layer.md) | FIPS Mesh Protocol (FMP): peer authentication, link encryption, forwarding |
| [fips-session-layer.md](fips-session-layer.md) | FIPS Session Protocol (FSP): end-to-end encryption, sessions |
| [fips-ipv6-adapter.md](fips-ipv6-adapter.md) | IPv6 adaptation: TUN interface, DNS, MTU enforcement |
@@ -58,7 +58,7 @@ specific topics.
fips-transport-layer fips-mesh- fips-software-
│ operation architecture
▼ │ │
fips-link-layer ◄────────┤ ▼
fips-mesh-layer ◄────────┤ ▼
│ │ fips-state-machines
▼ │
fips-session-layer ├──► fips-spanning-tree