New crate bgp-fib. It follows the routing table's best routes and keeps
the kernel's routing table the same, and learns the machine's interfaces
and addresses from the kernel, which is what says whether a next hop can
be reached.
- netlink: the rtnetlink messages used (routes, addresses, links, errors),
as bytes and back. No I/O; property tested and fuzzed.
- interfaces: what is directly reachable, and from which interface.
- plan: what to ask the kernel for, given the best routes and what the
kernel has. No I/O; tested against a model kernel.
- kernel (Linux only): the sockets and the task. Requests go in batches;
routes of ours found at startup are kept if still right and removed if
not; a change of interfaces has every route worked out again; a clean
stop removes our routes.
Only routes marked proto bgp with the configured table and metric are
ever touched. A best route is installed if its next hop is a neighbor;
next hops further away are not resolved through other routes yet, and
such prefixes are counted and shown instead.
Configured with `kernel { table metric }`; off by default. The daemon
needs CAP_NET_ADMIN and stops if the kernel refuses it. On shutdown it
closes sessions and then removes its routes.
/api/kernel and the status page show installed, unresolved and refused
counts, the last error and the interfaces; five bgp_kernel_* metrics.
Testing: scripts/kernel-tests.sh runs, in network namespaces of their
own and with only the capabilities the daemon needs, the installer
against `ip route`, the daemon with a peer, and two daemons that route
for each other with pings across over IPv4 and IPv6.
scripts/linux-vm.sh runs that, or anything else, in a Lima VM from
macOS. CI runs the kernel tests and fuzzes the netlink decoder.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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65 lines
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[workspace]
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default-members = ["bin/bgp"]
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members = ["bin/*", "crates/*"]
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# Fuzz targets need a nightly toolchain; see fuzz/README.md.
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exclude = ["fuzz"]
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resolver = "3"
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[workspace.package]
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authors = ["Rayhaan Jaufeerally <rayhaan+git@rayhaan.ch>"]
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description = "A Border Gateway Protocol implementation"
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edition = "2024"
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homepage = "https://rayhaan.ch"
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license = "Apache-2.0"
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repository = "https://git.rayhaan.net/rayhaan/ferrix"
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version = "0.0.2"
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# Every crate opts in with `[lints] workspace = true`. CI turns warnings into
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# errors, so a lint added here is enforced.
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[workspace.lints.rust]
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unsafe_code = "forbid"
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[workspace.lints.clippy]
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all = { level = "warn", priority = -1 }
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dbg_macro = "warn"
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todo = "warn"
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unimplemented = "warn"
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[workspace.dependencies]
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# --- Our crates ---
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bgp-fib = { path = "crates/fib" }
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bgp-packet = { path = "crates/packet" }
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bgp-primitives = { path = "crates/primitives" }
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bgp-rib = { path = "crates/rib" }
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bgp-rpki = { path = "crates/rpki" }
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bgp-server = { path = "crates/server" }
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bgp-web = { path = "crates/web" }
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bgp-integration-tests = { path = "crates/integration-tests" }
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bgp-bench = { path = "crates/bench" }
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# --- General ---
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bitfield = "0.19.0"
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bytes = "1.10.1"
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eyre = "0.6.12"
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nom = "8.0.0"
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serde = { version = "1.0.219", features = ["derive"] }
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socket2 = "0.6"
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serde_json = "1.0.140"
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serde_repr = "0.1.20"
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thiserror = "2.0.12"
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tokio = { version = "1.44.2", features = ["full"] }
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strum = { version = "0.27.1", features = ["derive"] }
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tracing = "0.1.44"
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tracing-subscriber = { version = "0.3.22", features = ["env-filter"] }
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prometheus = "0.14.0"
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proptest = "1.7"
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protobuf = { package = "protobuf", version = "3.7.2" }
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protobuf-codegen = { package = "protobuf-codegen", version = "3.7.2" }
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clap = { version = "4.5.53", features = ["derive"] }
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foldhash = "0.2"
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futures = "0.3"
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hashbrown = "0.17"
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axum = "0.8.9"
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tokio-stream = { version = "0.1.19", features = ["sync"] }
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reqwest = { version = "0.13.5", default-features = false, features = ["json"] }
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