wip bmp relay

Author: yuyuyureka

Cargo.lock

@@ -29,7 +29,7 @@ tokio-util = { version = "0.7", features = ["codec"] }
 weak-table = "0.3"
 nibbletree = { version = "0.2", path = "./nibbletree", features = ["ipnet"] }
 autometrics = { version = "0.3", features = ["prometheus-exporter"] }
-zettabgp = "0.3.4"
+zettabgp = { version = "0.3.4", git = "https://github.com/wobcom/zettabgp" }
 hickory-resolver = "0.24"
 include_dir = { version = "0.7", optional = true }
 mime_guess = { version = "2.0", optional = true }

Cargo.toml

@@ -6,4 +6,4 @@ collectors:
     collector_type: Bmp
     bind: "[::]:11019"
     peers:
-      "192.0.2.1": {}
+      "2a0e:b940:0:2:a00e:f9ff:fe1b:b7e9": {}

config.example.yml

@@ -0,0 +1,138 @@
+use crate::compressed_attrs::decompress_route_attrs;
+use crate::store::make_bgp_withdraw;
+use crate::store::TableSelector;
+use crate::store_impl::InMemoryStore;
+use crate::table_impl::Action;
+use crate::table_stream::table_stream;
+use futures_util::pin_mut;
+use futures_util::StreamExt;
+use serde::Deserialize;
+use std::net::Ipv4Addr;
+use std::net::SocketAddr;
+use std::time::Duration;
+use tokio::io::AsyncWriteExt;
+use zettabgp::bmp::prelude::*;
+use zettabgp::prelude::*;
+
+#[derive(Debug, Deserialize)]
+pub struct RelayConfig {
+    table: TableSelector,
+    monitoring_station: SocketAddr,
+    router_id: Ipv4Addr,
+    asn: u32,
+}
+
+async fn run_(cfg: RelayConfig, store: InMemoryStore) -> ! {
+    let table = store.get_table(cfg.table);
+    let mut buf = [0; 10000];
+    'outer: loop {
+        let updates_stream = table_stream(&table);
+        pin_mut!(updates_stream);
+
+        let mut tcp_stream = match tokio::net::TcpStream::connect(cfg.monitoring_station).await {
+            Err(_) => {
+                log::info!("trying to connect {}", cfg.monitoring_station);
+                tokio::time::sleep(Duration::from_secs(5)).await;
+                continue 'outer;
+            }
+            Ok(v) => v,
+        };
+        log::info!("connected {}", cfg.monitoring_station);
+
+        let fake_open_message = BgpOpenMessage {
+            as_num: cfg.asn,
+            caps: vec![
+                BgpCapability::SafiIPv4u,
+                BgpCapability::SafiIPv6u,
+                BgpCapability::SafiVPNv4u,
+                BgpCapability::SafiVPNv6u,
+                BgpCapability::CapRR,
+                BgpCapability::CapASN32(cfg.asn),
+            ],
+            hold_time: 0,
+            router_id: cfg.router_id,
+        };
+        let peer_hdr = BmpMessagePeerHeader {
+            peertype: 3,
+            flags: 0,
+            peerdistinguisher: BgpRD::new(0, 0),
+            peeraddress: "::".parse().unwrap(),
+            asnum: cfg.asn,
+            routerid: cfg.router_id,
+            timestamp: 0,
+        };
+        let mut bmp_messages = futures_util::stream::iter([
+            BmpMessage::Initiation(BmpMessageInitiation {
+                str0: None,
+                sys_descr: None,
+                sys_name: None,
+            }),
+            BmpMessage::PeerUpNotification(BmpMessagePeerUp {
+                peer: peer_hdr.clone(),
+                localaddress: "::".parse().unwrap(),
+                localport: 0,
+                remoteport: 0,
+                msg1: fake_open_message.clone(),
+                msg2: fake_open_message,
+            }),
+        ])
+        .chain(updates_stream.map(|action| {
+            let update = match action {
+                (net, num, Action::Withdraw) => {
+                    if num != 0 {
+                        //log::warn!("add-paths table is not yet implemented");
+                    }
+                    make_bgp_withdraw(net)
+                }
+                (net, num, Action::Update(attrs)) => {
+                    if num != 0 {
+                        //log::warn!("add-paths table is not yet implemented");
+                    }
+                    decompress_route_attrs(&attrs).to_bgp_update(net)
+                }
+            };
+
+            BmpMessage::RouteMonitoring(BmpMessageRouteMonitoring {
+                peer: peer_hdr.clone(),
+                update,
+            })
+        }));
+
+        'inner: while let Some(bmp_msg) = bmp_messages.next().await {
+            log::trace!("sending message {}: {:?}", cfg.monitoring_station, bmp_msg);
+            let mut len = 0;
+            match bmp_msg.encode_to(&mut buf[5..]) {
+                Ok(i) => len += i,
+                Err(e) => {
+                    log::warn!("error encoding BMP message {:?}: {}", bmp_msg, e);
+                    continue 'inner;
+                }
+            }
+            let msg_hdr = BmpMessageHeader {
+                version: 3,
+                msglength: len + 5,
+            };
+            len += msg_hdr.encode_to(&mut buf).unwrap();
+
+            if let Err(e) = tcp_stream.write_all(&buf[..len]).await {
+                log::warn!(
+                    "resetting connection {:?}, reason: {}",
+                    cfg.monitoring_station,
+                    e
+                );
+                continue 'outer;
+            }
+        }
+    }
+}
+
+pub async fn run(
+    cfg: RelayConfig,
+    store: InMemoryStore,
+    mut shutdown: tokio::sync::watch::Receiver<bool>,
+) -> anyhow::Result<()> {
+    tokio::select! {
+        _ = run_(cfg, store) => unreachable!(),
+        _ = shutdown.changed() => Ok(()),
+    }
+}

src/bmp_relay.rs

@@ -2,6 +2,7 @@ pub mod api;
 pub mod bgp_collector;
 mod bgpdumper;
 pub mod bmp_collector;
+pub mod bmp_relay;
 mod compressed_attrs;
 pub mod route_distinguisher;
 pub mod store;
@@ -42,4 +43,6 @@ pub struct Config {
     /// Only check config and exit
     #[serde(default)]
     pub config_check: bool,
+    #[serde(default)]
+    pub bmp_relays: HashMap<String, bmp_relay::RelayConfig>,
 }

src/lib.rs

@@ -61,6 +61,10 @@ async fn main() -> anyhow::Result<()> {
             }),
     );
 
+    futures.extend(cfg.bmp_relays.into_values().map(|relay| {
+        tokio::task::spawn(bmp_relay::run(relay, store.clone(), shutdown_rx.clone()))
+    }));
+
     let mut sigint = signal(SignalKind::interrupt())?;
     let mut sigterm = signal(SignalKind::terminate())?;
     let res = tokio::select! {

src/main.rs

@@ -148,6 +148,84 @@ impl Default for QueryLimits {
     }
 }
 
+pub fn make_bgp_withdraw(net: IpNet) -> zettabgp::prelude::BgpUpdateMessage {
+    use zettabgp::prelude::*;
+
+    BgpUpdateMessage {
+        attrs: vec![BgpAttrItem::MPWithdraws(BgpMPWithdraws {
+            addrs: net_to_bgp_addrs(net),
+        })],
+        ..Default::default()
+    }
+}
+
+impl RouteAttrs {
+    pub fn to_bgp_update(&self, net: IpNet) -> zettabgp::prelude::BgpUpdateMessage {
+        use zettabgp::prelude::*;
+
+        let mut attrs = vec![];
+
+        if let Some(nexthop) = self.nexthop {
+            attrs.push(BgpAttrItem::MPUpdates(BgpMPUpdates {
+                nexthop: std_addr_to_bgp_addr(nexthop),
+                addrs: net_to_bgp_addrs(net),
+            }));
+        } else {
+            warn!("Can not build MPUpdates without nexthop");
+        }
+
+        if let Some(communities) = &self.communities {
+            attrs.push(BgpAttrItem::CommunityList(BgpCommunityList {
+                value: communities
+                    .iter()
+                    .map(|(high, low)| BgpCommunity::new(((*high as u32) << 16) + *low as u32))
+                    .collect(),
+            }));
+        }
+        if let Some(large_communities) = &self.large_communities {
+            attrs.push(BgpAttrItem::LargeCommunityList(BgpLargeCommunityList {
+                value: large_communities
+                    .iter()
+                    .cloned()
+                    .map(|(ga, ldp1, ldp2)| BgpLargeCommunity { ga, ldp1, ldp2 })
+                    .collect(),
+            }));
+        }
+
+        if let Some(med) = self.med {
+            attrs.push(BgpAttrItem::MED(BgpMED { value: med }));
+        }
+        if let Some(local_pref) = self.local_pref {
+            attrs.push(BgpAttrItem::LocalPref(BgpLocalpref { value: local_pref }));
+        }
+
+        if let Some(origin) = &self.origin {
+            attrs.push(BgpAttrItem::Origin(BgpOrigin {
+                value: match origin {
+                    RouteOrigin::Igp => BgpAttrOrigin::Igp,
+                    RouteOrigin::Egp => BgpAttrOrigin::Egp,
+                    RouteOrigin::Incomplete => BgpAttrOrigin::Incomplete,
+                },
+            }));
+        }
+
+        if let Some(as_path) = &self.as_path {
+            attrs.push(BgpAttrItem::ASPath(BgpASpath {
+                value: as_path
+                    .iter()
+                    .cloned()
+                    .map(|value| BgpAS { value })
+                    .collect(),
+            }));
+        }
+
+        BgpUpdateMessage {
+            attrs,
+            ..Default::default()
+        }
+    }
+}
+
 pub trait Store: Clone + Send + Sync + 'static {
     fn update_route(
         &self,
@@ -362,6 +440,27 @@ fn bgp_addrs_to_nets(
     }
 }
 
+fn std_addr_to_bgp_addr(net: IpAddr) -> zettabgp::prelude::BgpAddr {
+    use zettabgp::prelude::*;
+    match net {
+        IpAddr::V4(v4) => BgpAddr::V4(v4),
+        IpAddr::V6(v6) => BgpAddr::V6(v6),
+    }
+}
+fn net_to_bgp_addrs(net: IpNet) -> zettabgp::prelude::BgpAddrs {
+    use zettabgp::prelude::*;
+    match net {
+        IpNet::V4(v4) => BgpAddrs::IPV4U(vec![BgpAddrV4 {
+            addr: v4.addr(),
+            prefixlen: v4.prefix_len(),
+        }]),
+        IpNet::V6(v6) => BgpAddrs::IPV6U(vec![BgpAddrV6 {
+            addr: v6.addr(),
+            prefixlen: v6.prefix_len(),
+        }]),
+    }
+}
+
 fn bgpv4addr_to_ipnet(addr: &BgpAddrV4) -> Option<IpNet> {
     Ipv4Net::new(addr.addr, addr.prefixlen)
         .inspect_err(|_| warn!("invalid BgpAddrs prefixlen"))

src/store.rs

@@ -55,7 +55,7 @@ impl InMemoryStore {
                 == query_router_id
         }
     }
-    fn get_table(&self, sel: TableSelector) -> InMemoryTable {
+    pub fn get_table(&self, sel: TableSelector) -> InMemoryTable {
         self.tables
             .lock()
             .unwrap()