alexion
b87076ebd3
Introduce `modules.network`, the host-level networking foundation a Host declares once. A Host states its trunk interface and the tagged VLAN ids to materialize, and the module emits one systemd-networkd bridge per VLAN, named by the `br-vlan<id>` convention, plus the host's own management address on a chosen VLAN's bridge. The trunk and every bridge set `RequiredForOnline = "no"` so wait-online never blocks boot on a carrier-less link, and the module owns its own NetworkManager `unmanaged` guard so enabling it is self-sufficient. Two assertions tie the management VLAN to the declared VLANs and a management address to a VLAN, so an address can never be silently dropped. Enabled on neogaia as a tracer with placeholder values, proving the host build and bridge-name evaluation through `nix flake check`. No Guest is wired to a bridge yet.
31 lines
2.3 KiB
Markdown
31 lines
2.3 KiB
Markdown
---
|
|
spec: guests
|
|
---
|
|
|
|
## What to build
|
|
|
|
The host-level networking foundation, `modules.network`, that a Host declares once and every Guest attaches to.
|
|
A Host states its trunk interface and the set of VLANs to materialize, and the Module emits one bridge per tagged VLAN using systemd-networkd, named by the `br-vlan<id>` convention, and manages the Host's own management address.
|
|
This is a standalone host-level Module and does not yet wire any Guest to a bridge — that is the Guest networking placement slice.
|
|
|
|
## Acceptance criteria
|
|
|
|
- [x] `modules.network` declares an `enable` option and its option path mirrors its file location per the Namespace convention.
|
|
- [x] A Host declares its trunk interface and its set of VLAN ids through the Module's options.
|
|
- [x] Enabling the Module emits exactly one systemd-networkd bridge per declared VLAN, each named `br-vlan<id>`, and manages the Host's own management address.
|
|
- [x] A Host enabling `modules.network` builds via `nix flake check`, and the emitted bridge names are verifiable by `nix eval`.
|
|
|
|
## Implementation Notes
|
|
|
|
Each VLAN materializes as three networkd entries: a `<trunk>.<id>` tagged sub-interface stacked on the trunk, a `br-vlan<id>` bridge, and a network enslaving the sub-interface to the bridge.
|
|
The trunk and every bridge set `RequiredForOnline = "no"`, so `systemd-networkd-wait-online` never blocks boot on a link with no carrier.
|
|
|
|
The management address takes a static CIDR, or DHCP when left null, on the management VLAN's bridge alone.
|
|
Two assertions guard it: the management VLAN must be one of the declared VLANs, and a declared management address must name a management VLAN, so an address can never be silently dropped for want of a bridge to carry it.
|
|
|
|
The Module owns its own NetworkManager `unmanaged` guard for the trunk, sub-interfaces, and bridges, so enabling it is self-sufficient on a host that also runs NetworkManager rather than pushing that wiring into every Host.
|
|
A `management.gateway` option was considered and dropped as speculative for this slice, since the foundation carries no other routing.
|
|
|
|
Enabled on `neogaia` as a tracer with a placeholder trunk and VLAN ids, mirroring the walking-skeleton guest, so the host build and bridge-name evaluation are proven through this host's `nix flake check`.
|
|
No Guest is wired to a bridge — that is the guest networking placement slice.
|