[PATCH proxmox 1/2] network-api: add is_veth helper to IpLink

[Jakob Klocker <j.klocker@proxmox.com>]

Add a method to check whether an interface is one end of a veth pair
(info_kind = "veth"). This is used to identify a LXC container's network
uplink, which is a veth rather than a physical NIC and therefore is
not recognized by is_physical().

Signed-off-by: Jakob Klocker <j.klocker@proxmox.com>
---
 proxmox-network-api/src/config/helper.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/proxmox-network-api/src/config/helper.rs b/proxmox-network-api/src/config/helper.rs
index a9ae35fc..a13d6cc3 100644
--- a/proxmox-network-api/src/config/helper.rs
+++ b/proxmox-network-api/src/config/helper.rs
@@ -207,6 +207,19 @@ impl IpLink {
         PHYSICAL_NIC_REGEX.is_match(&self.ifname)
     }
 
+    /// Whether this is a `veth` (virtual ethernet) interface.
+    ///
+    /// Checks whether `info_kind` in `linkinfo` is set to `"veth"`. Inside an
+    /// LXC container, the uplink is one end of a veth pair rather than a physical
+    /// NIC, so this is used alongside [`is_physical`] to decide whether an
+    /// interface carries the machine's network traffic.
+    pub fn is_veth(&self) -> bool {
+        self.linkinfo
+            .as_ref()
+            .and_then(|li| li.info_kind.as_deref())
+            == Some("veth")
+    }
+
     /// The name of the interface (ifname / IFLA_IFNAME).
     pub fn name(&self) -> &str {
         &self.ifname
-- 
2.47.3