feat(gateway): open AF_PACKET sockets

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

This commit is contained in:

ddidderr

2026-05-21 18:09:03 +02:00

parent 763a55bfba

commit 1b00deb419

7 changed files with 186 additions and 2 deletions

									
										Cargo.toml
									
		+1
		
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				@@ -18,6 +18,7 @@ edition = "2024"

				anyhow = "1"

				bytes = "1"

				clap = { version = "4.6.1", features = ["derive"] }

				libc = "0.2"

				quinn = "0.11.9"

				rcgen = "0.14.8"

				rustls = { version = "0.23", default-features = false, features = ["ring", "std"] }