[PATCH proxmox-perl-rs v4 1/9] pve-rs: sdn: add IPv6 RA builder binding

[Hannes Laimer <h.laimer@proxmox.com>]

Perl builds the FRR config handed in for rendering, while the
conversion of the IPv6 Router Advertisement settings for it lives in
Rust. The binding takes a vnet and its subnets as the running config
holds them and returns the vnet's entry for the RA part of that FRR
config, with the prefix defaults applied.

Signed-off-by: Hannes Laimer <h.laimer@proxmox.com>
---
 pve-rs/Makefile                    |  1 +
 pve-rs/src/bindings/sdn/ipv6_ra.rs | 40 ++++++++++++++++++++++++++++++
 pve-rs/src/bindings/sdn/mod.rs     |  1 +
 3 files changed, 42 insertions(+)
 create mode 100644 pve-rs/src/bindings/sdn/ipv6_ra.rs

diff --git a/pve-rs/Makefile b/pve-rs/Makefile
index bb1cd2d5f73a..0dfd672fa496 100644
--- a/pve-rs/Makefile
+++ b/pve-rs/Makefile
@@ -33,6 +33,7 @@ PERLMOD_PACKAGES := \
 	  PVE::RS::ResourceScheduling::Static \
 	  PVE::RS::ResourceScheduling::Dynamic \
 	  PVE::RS::SDN::Fabrics \
+	  PVE::RS::SDN::IPv6RA \
 	  PVE::RS::SDN::PrefixLists \
 	  PVE::RS::SDN::RouteMaps \
 	  PVE::RS::SDN::WireGuard::PrivateKeys \
diff --git a/pve-rs/src/bindings/sdn/ipv6_ra.rs b/pve-rs/src/bindings/sdn/ipv6_ra.rs
new file mode 100644
index 000000000000..7e7ed84c788b
--- /dev/null
+++ b/pve-rs/src/bindings/sdn/ipv6_ra.rs
@@ -0,0 +1,40 @@
+#[perlmod::package(name = "PVE::RS::SDN::IPv6RA", lib = "pve_rs")]
+pub mod pve_rs_sdn_ipv6_ra {
+    //! The `PVE::RS::SDN::IPv6RA` package.
+    //!
+    //! This builds the FRR IPv6 Router Advertisement configuration of a vnet from the
+    //! running config of the vnet and its subnets.
+
+    use std::collections::BTreeMap;
+
+    use anyhow::{Context, Error};
+
+    use proxmox_frr::ser::nd::NdInterface;
+    use proxmox_ve_config::sdn::{
+        SubnetName, VnetName,
+        config::{SubnetConfig, SubnetRunningConfig, VnetConfig, VnetRunningConfig},
+        nd::frr::build_nd_interface,
+    };
+
+    /// Method: Build the [`NdInterface`] of a vnet. Returns `None` when the vnet has RAs
+    /// off or no IPv6 subnet.
+    #[export]
+    pub fn build_interface(
+        vnet_name: VnetName,
+        vnet: VnetRunningConfig,
+        subnets: BTreeMap<String, SubnetRunningConfig>,
+    ) -> Result<Option<NdInterface>, Error> {
+        let mut vnet_config = VnetConfig::new(vnet_name, None);
+        vnet_config.set_ipv6_ra(vnet.ipv6_ra_config());
+
+        let mut subnet_configs: Vec<SubnetConfig> = Vec::with_capacity(subnets.len());
+        for (id, running) in subnets {
+            let name: SubnetName = id
+                .parse()
+                .with_context(|| format!("invalid subnet id: {id}"))?;
+            subnet_configs.push(SubnetConfig::try_from_running_config(name, running)?);
+        }
+
+        Ok(build_nd_interface(&vnet_config, subnet_configs.iter()))
+    }
+}
diff --git a/pve-rs/src/bindings/sdn/mod.rs b/pve-rs/src/bindings/sdn/mod.rs
index dcae046a7e46..fb50526785e5 100644
--- a/pve-rs/src/bindings/sdn/mod.rs
+++ b/pve-rs/src/bindings/sdn/mod.rs
@@ -1,4 +1,5 @@
 pub(crate) mod fabrics;
+pub(crate) mod ipv6_ra;
 pub(crate) mod prefix_lists;
 pub(crate) mod route_maps;
 pub(crate) mod wireguard;
-- 
2.47.3