routing: introduce static routes implementation

Example configuration (using the CLI):
```
routing control-plane-protocols control-plane-protocol ietf-routing:static main
 !
 static-routes ipv4 route 172.16.1.0/24
  next-hop outgoing-interface eth-rt2
  next-hop next-hop-address 10.0.1.2
 !
 static-routes ipv4 route 172.16.2.0/24
  !
  next-hop next-hop-list next-hop 1
   outgoing-interface eth-rt2
   next-hop-address 10.0.1.2
  !
  next-hop next-hop-list next-hop 2
   outgoing-interface eth-rt3
   next-hop-address 10.0.2.3
  !
 !
 static-routes ipv4 route 172.16.3.0/24
  next-hop special-next-hop blackhole
 !
!
```

Currently, setting the administrative distance in static routes is
not supported.

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>

README.md

@@ -194,8 +194,8 @@ Holo supports the following IETF RFCs and Internet drafts:
 | ietf-bfd@2022-09-22 | 100.00% | 100.00% | - | - | [100.00%](http://westphal.com.br/holo/ietf-bfd.html) |
 | ietf-interfaces@2018-01-09 | 100.00% | 0.00% | - | - | [22.22%](http://westphal.com.br/holo/ietf-interfaces.html) |
 | ietf-ip@2018-01-09 | 17.39% | 0.00% | - | - | [13.33%](http://westphal.com.br/holo/ietf-ip.html) |
-| ietf-ipv4-unicast-routing@2018-03-13 | 0.00% | 100.00% | - | - | [18.75%](http://westphal.com.br/holo/ietf-ipv4-unicast-routing.html) |
-| ietf-ipv6-unicast-routing@2018-03-13 | 0.00% | 100.00% | - | - | [8.57%](http://westphal.com.br/holo/ietf-ipv6-unicast-routing.html) |
+| ietf-ipv4-unicast-routing@2018-03-13 | 100.00% | 100.00% | - | - | [100.00%](http://westphal.com.br/holo/ietf-ipv4-unicast-routing.html) |
+| ietf-ipv6-unicast-routing@2018-03-13 | 40.62% | 100.00% | - | - | [45.71%](http://westphal.com.br/holo/ietf-ipv6-unicast-routing.html) |
 | ietf-key-chain@2017-04-18 | 100.00% | 100.00% | - | - | [100.00%](http://westphal.com.br/holo/ietf-key-chain.html) |
 | ietf-mpls-ldp@2022-03-14 | 86.96% | 92.31% | 100.00% | 100.00% | [92.38%](http://westphal.com.br/holo/ietf-mpls-ldp.html) |
 | ietf-mpls@2020-12-18 | 0.00% | 57.14% | - | - | [35.29%](http://westphal.com.br/holo/ietf-mpls.html) |
@@ -204,7 +204,7 @@ Holo supports the following IETF RFCs and Internet drafts:
 | ietf-ospfv3-extended-lsa@2023-08-21 | 50.00% | 85.28% | - | - | [84.85%](http://westphal.com.br/holo/ietf-ospfv3-extended-lsa.html) |
 | ietf-rip@2020-02-20 | 27.91% | 93.33% | 100.00% | - | [55.41%](http://westphal.com.br/holo/ietf-rip.html) |
 | ietf-routing-policy@2021-10-11 | 100.00% | 0.00% | - | - | [98.11%](http://westphal.com.br/holo/ietf-routing-policy.html) |
-| ietf-routing@2018-03-13 | 91.67% | 85.71% | - | - | [88.46%](http://westphal.com.br/holo/ietf-routing.html) |
+| ietf-routing@2018-03-13 | 100.00% | 85.71% | - | - | [92.31%](http://westphal.com.br/holo/ietf-routing.html) |
 | ietf-segment-routing-mpls@2021-05-26 | 62.50% | 0.00% | - | 23.53% | [32.76%](http://westphal.com.br/holo/ietf-segment-routing-mpls.html) |
 | ietf-segment-routing@2021-05-26 | 100.00% | - | - | - | [100.00%](http://westphal.com.br/holo/ietf-segment-routing.html) |
 

holo-routing/src/ibus.rs

@@ -10,12 +10,23 @@ use holo_utils::southbound::{RouteKeyMsg, RouteMsg};
 use ipnetwork::IpNetwork;
 
 use crate::rib::Route;
-use crate::Master;
+use crate::{Interface, Master};
 
 // ===== global functions =====
 
 pub(crate) async fn process_msg(master: &mut Master, msg: IbusMsg) {
     match msg {
+        // Interface update notification.
+        IbusMsg::InterfaceUpd(msg) => {
+            master.interfaces.insert(
+                msg.ifname.clone(),
+                Interface::new(msg.ifname, msg.ifindex, msg.flags),
+            );
+        }
+        // Interface delete notification.
+        IbusMsg::InterfaceDel(ifname) => {
+            master.interfaces.remove(&ifname);
+        }
         // Interface address addition notification.
         IbusMsg::InterfaceAddressAdd(msg) => {
             // Add connected route to the RIB.

holo-routing/src/lib.rs

@@ -23,12 +23,14 @@ use holo_northbound::{
 use holo_protocol::{event_recorder, spawn_protocol_task, InstanceShared};
 use holo_utils::ibus::{IbusReceiver, IbusSender};
 use holo_utils::protocol::Protocol;
+use holo_utils::southbound::InterfaceFlags;
 use holo_utils::sr::SrCfg;
 use holo_utils::Database;
+use ipnetwork::IpNetwork;
 use tokio::sync::mpsc;
 use tracing::Instrument;
 
-use crate::rib::Rib;
+use crate::rib::{Rib, StaticRoute};
 
 pub struct Master {
     // Northbound Tx channel.
@@ -41,8 +43,12 @@ pub struct Master {
     pub event_recorder_config: event_recorder::Config,
     // Netlink socket.
     pub netlink_handle: rtnetlink::Handle,
+    // List of interfaces.
+    pub interfaces: BTreeMap<String, Interface>,
     // RIB.
     pub rib: Rib,
+    // Static routes.
+    pub static_routes: BTreeMap<IpNetwork, StaticRoute>,
     // SR configuration data.
     pub sr_config: SrCfg,
     // Protocol instances.
@@ -57,6 +63,13 @@ pub struct InstanceId {
     pub name: String,
 }
 
+#[derive(Debug, new)]
+pub struct Interface {
+    pub ifname: String,
+    pub ifindex: u32,
+    pub flags: InterfaceFlags,
+}
+
 // ===== impl Master =====
 
 impl Master {
@@ -115,7 +128,9 @@ pub fn start(
             shared: shared.clone(),
             event_recorder_config,
             netlink_handle: netlink::init(),
+            interfaces: Default::default(),
             rib: Default::default(),
+            static_routes: Default::default(),
             sr_config: Default::default(),
             instances: Default::default(),
         };