use bgp_rs::{AFI, SAFI, AddPathDirection, Open, OpenCapability, OpenParameter, NLRIEncoding, PathAttribute};
use bgp_rs::Capabilities;
-use bgp_rs::{ASPath, Segment};
+use bgp_rs::Segment;
use bgp_rs::Message;
use bgp_rs::Reader;
use crate::printer::Printer;
-pub struct RoutingTable {
- v4_table: BTreeMap<(Ipv4Addr, u8, u32), Arc<Vec<PathAttribute>>>,
- v6_table: BTreeMap<(Ipv6Addr, u8, u32), Arc<Vec<PathAttribute>>>,
+struct Route {
+ path: Vec<u32>,
+ pref: u32,
+ med: u32,
+}
+
+struct RoutingTable {
+ v4_table: BTreeMap<(Ipv4Addr, u8, u32), Arc<Route>>,
+ v6_table: BTreeMap<(Ipv6Addr, u8, u32), Arc<Route>>,
}
impl RoutingTable {
}
}
- fn get_route_attrs(&self, ip: IpAddr) -> Vec<Arc<Vec<PathAttribute>>> {
+ fn get_route_attrs(&self, ip: IpAddr) -> Vec<Arc<Route>> {
macro_rules! lookup_res {
($addrty: ty, $addr: expr, $table: expr, $addr_bits: expr) => { {
let mut res = Vec::new();
//TODO: Optimize this!
- for i in (0..($addr_bits + 1)).rev() {
+ for i in (0..$addr_bits).rev() {
let mut lookup = $addr.octets();
for b in 0..(i / 8) {
- lookup[lookup.len() - b] = 0;
+ lookup[lookup.len() - b - 1] = 0;
}
- lookup[lookup.len() - (i/8)] &= !(((1u16 << (i % 8)) - 1) as u8);
+ lookup[lookup.len() - (i/8) - 1] &= !(((1u16 << (i % 8)) - 1) as u8);
let lookup_addr = <$addrty>::from(lookup);
- for attrs in $table.range((Included((lookup_addr, $addr_bits, 0)), Included((lookup_addr, $addr_bits, std::u32::MAX)))) {
+ for attrs in $table.range((Included((lookup_addr, $addr_bits - i as u8, 0)), Included((lookup_addr, $addr_bits - i as u8, std::u32::MAX)))) {
res.push(Arc::clone(&attrs.1));
}
if !res.is_empty() { break; }
};
}
- fn announce(&mut self, route: NLRIEncoding, attrs: Arc<Vec<PathAttribute>>) {
- match route {
+ fn announce(&mut self, prefix: NLRIEncoding, route: Arc<Route>) {
+ match prefix {
NLRIEncoding::IP(p) => {
let (ip, len) = <(IpAddr, u8)>::from(&p);
match ip {
- IpAddr::V4(v4a) => self.v4_table.insert((v4a, len, 0), attrs),
- IpAddr::V6(v6a) => self.v6_table.insert((v6a, len, 0), attrs),
+ IpAddr::V4(v4a) => self.v4_table.insert((v4a, len, 0), route),
+ IpAddr::V6(v6a) => self.v6_table.insert((v6a, len, 0), route),
}
},
NLRIEncoding::IP_WITH_PATH_ID((p, id)) => {
let (ip, len) = <(IpAddr, u8)>::from(&p);
match ip {
- IpAddr::V4(v4a) => self.v4_table.insert((v4a, len, id), attrs),
- IpAddr::V6(v6a) => self.v6_table.insert((v6a, len, id), attrs),
+ IpAddr::V4(v4a) => self.v4_table.insert((v4a, len, id), route),
+ IpAddr::V6(v6a) => self.v6_table.insert((v6a, len, id), route),
}
},
NLRIEncoding::IP_MPLS(_) => None,
}
impl BGPClient {
pub fn get_asn(&self, addr: IpAddr) -> u32 {
- let attr_set = self.routes.lock().unwrap().get_route_attrs(addr);
- let mut paths: Vec<(ASPath, u32, u32)> = Vec::new();
- for attrs in attr_set.iter() {
- let mut as4_path = None;
- let mut as_path = None;
- let mut pref = 100;
- let mut med = 0;
- for attr in attrs.iter() {
- match attr {
- PathAttribute::AS4_PATH(path) => as4_path = Some(path),
- PathAttribute::AS_PATH(path) => as_path = Some(path),
- PathAttribute::LOCAL_PREF(p) => pref = *p,
- PathAttribute::MULTI_EXIT_DISC(m) => med = *m,
- _ => {},
+ let mut path_vecs = self.routes.lock().unwrap().get_route_attrs(addr).clone();
+ if path_vecs.is_empty() { return 0; }
+
+ path_vecs.sort_unstable_by(|path_a, path_b| {
+ path_a.pref.cmp(&path_b.pref)
+ .then(path_b.path.len().cmp(&path_a.path.len()))
+ .then(path_b.med.cmp(&path_a.med))
+ });
+
+ let primary_route = path_vecs.pop().unwrap();
+ 'asn_candidates: for asn in primary_route.path.iter().rev() {
+ for secondary_route in path_vecs.iter() {
+ if !secondary_route.path.contains(asn) {
+ continue 'asn_candidates;
}
}
- if let Some(path) = as4_path.or(as_path) {
- paths.push((path.clone(), pref, med));
- }
+ return *asn;
}
- if paths.is_empty() { return 0; }
+ *primary_route.path.last().unwrap_or(&0)
+ }
+
+ pub fn disconnect(&self) {
+ self.shutdown.store(true, Ordering::Relaxed);
+ }
- let mut path_vecs: Vec<_> = paths.iter_mut().map(|(p, pref, med)| {
+ fn map_attrs(mut attrs: Vec<PathAttribute>) -> Option<Route> {
+ let mut as4_path = None;
+ let mut as_path = None;
+ let mut pref = 100;
+ let mut med = 0;
+ for attr in attrs.drain(..) {
+ match attr {
+ PathAttribute::AS4_PATH(path) => as4_path = Some(path),
+ PathAttribute::AS_PATH(path) => as_path = Some(path),
+ PathAttribute::LOCAL_PREF(p) => pref = p,
+ PathAttribute::MULTI_EXIT_DISC(m) => med = m,
+ _ => {},
+ }
+ }
+ if let Some(mut aspath) = as4_path.or(as_path) {
let mut path = Vec::new();
- for seg in p.segments.drain(..) {
+ for seg in aspath.segments.drain(..) {
match seg {
Segment::AS_SEQUENCE(mut asn) => path.append(&mut asn),
Segment::AS_SET(_) => {}, // Ignore sets for now, they're not that common anyway
}
}
- (path, pref, med)
- }).collect();
- path_vecs.sort_unstable_by(|(path_a, pref_a, med_a), (path_b, pref_b, med_b)| {
- pref_a.cmp(pref_b).then(path_b.len().cmp(&path_a.len())).then(med_b.cmp(med_a))
- });
- // TODO: Find last common ASN among all paths
- *path_vecs[0].0.last().unwrap_or(&0)
- }
-
- pub fn disconnect(&self) {
- self.shutdown.store(true, Ordering::Relaxed);
+ return Some(Route {
+ path: path.clone(),
+ pref,
+ med,
+ })
+ } else { None }
}
fn connect_given_client(addr: SocketAddr, timeout: Duration, printer: &'static Printer, client: Arc<BGPClient>) {
}
match bgp_msg {
Message::Open(_) => {
- printer.add_line("Connected to BGP route provider".to_string(), true);
+ client.routes.lock().unwrap().v4_table.clear();
+ client.routes.lock().unwrap().v6_table.clear();
+ printer.add_line("Connected to BGP route provider".to_string(), false);
},
Message::KeepAlive => {
let _ = sender.try_send(Message::KeepAlive);
for r in upd.withdrawn_routes {
route_table.withdraw(r);
}
- let attrs = Arc::new(upd.attributes);
- for r in upd.announced_routes {
- route_table.announce(r, Arc::clone(&attrs));
+ if let Some(path) = Self::map_attrs(upd.attributes) {
+ let path_arc = Arc::new(path);
+ for r in upd.announced_routes {
+ route_table.announce(r, Arc::clone(&path_arc));
+ }
}
},
_ => {}
projects / dnsseed-rust / blobdiff