ddidderr
1b00deb419
The gateway now has a small Linux PacketSocket wrapper for raw Ethernet frame I/O. It resolves the configured interface with if_nametoindex, opens an AF_PACKET/SOCK_RAW socket for ETH_P_ALL, binds it to the interface, and exposes thin send_frame and recv_frame helpers around the owned file descriptor. The gateway binary opens this socket after completing the relay control handshake. The frame bridge loop is still intentionally left for a later slice, but the process now proves the two required resources are available: relay admission and raw L2 access on the LAN interface. Tests cover interface-name validation and missing-interface lookup without requiring root or CAP_NET_RAW. Test Plan: - cargo fmt --check - cargo test --workspace - cargo clippy --workspace --all-targets -- -D warnings Refs: PLAN.md Linux AF_PACKET gateway socket
86 lines
2.8 KiB
Markdown
86 lines
2.8 KiB
Markdown
# softlan-vpn
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Monorepo for a Layer 2 over QUIC LAN party bridge.
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## Workspace crates
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- `lanparty-proto`: shared frame format, MAC validation, MTU helpers.
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- `lanparty-ctrl`: control-plane messages (join/hello/role/version).
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- `lanparty-obs`: shared diagnostics/logging event models.
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- `lanparty-client-core`: platform-agnostic client session state.
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- `lanparty-client-win`: Windows TAP + route/metric handling binary.
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- `lanparty-gateway`: Linux AF_PACKET gateway binary.
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- `lanparty-relay`: public QUIC relay binary.
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### `lanparty-proto`
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Transport-agnostic tunnel contract shared by all binaries:
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- overlay datagram header encoding and decoding
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- Ethernet frame header parsing
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- MAC address parsing and identity validation
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- QUIC datagram to TAP MTU budget helpers
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### `lanparty-ctrl`
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Reliable control-plane schema shared by the QUIC stream handlers:
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- endpoint hello messages with role, room, MAC, and datagram budget
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- server welcome, reject, peer lifecycle, stats, and disconnect messages
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- room-code, role/MAC, peer-id, and effective-MTU validation
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- length-prefixed JSON control frames for reliable QUIC streams
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### `lanparty-obs`
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Shared diagnostics and structured logging vocabulary:
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- gateway/relay frame logs with MACs, ethertype, length, peer, and action
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- tunnel counters shared by control messages and runtime diagnostics
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- client connectivity/TAP diagnostics and user-facing status messages
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### `lanparty-relay`
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Public relay binary and relay-owned room state:
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- QUIC endpoint binding and first-stream hello/welcome admission
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- room admission for clients and gateways
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- one gateway per room, duplicate client MAC rejection, and room limits
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- stable effective room MTU chosen before Ethernet datagrams flow
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- live Ethernet datagram forwarding with no ingress reflection
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- L2 safety filters for jumbo, switch-control, DHCP-server, and IPv6-RA frames
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- peer leave cleanup for room membership and MAC indexes
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## Build
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```bash
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cargo check --workspace
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```
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## Relay
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```bash
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cargo run -p lanparty-relay -- --listen 443/udp
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```
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`--listen` accepts either a socket address or a UDP port shorthand such as
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`443/udp`. The relay binds a QUIC endpoint, accepts a control-stream `hello`,
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replies with `welcome` or `reject`, and forwards live Ethernet QUIC datagrams
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between accepted peers in the same room. It currently uses a generated
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self-signed development certificate; production certificate and client trust
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handling remain future work.
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## Gateway
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```bash
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cargo run -p lanparty-gateway -- \
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--relay 203.0.113.10:443 \
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--server-name lanparty-relay.local \
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--relay-ca-cert relay-cert.der \
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--room ROOM1 \
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--interface eth0
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```
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The gateway currently connects to the relay as `role = gateway`, completes the
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control-stream hello/welcome handshake, opens an AF_PACKET socket on the LAN
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interface, and then waits for shutdown. The frame bridge loop is not wired yet.
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