use std::sync::{Arc, Mutex};
use std::sync::atomic::{AtomicBool, Ordering};
use std::cmp;
-use std::ops::Bound::Included;
-use std::collections::BTreeMap;
+use std::collections::HashMap;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr};
use std::time::{Duration, Instant};
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 futures::sync::mpsc;
-use crate::printer::Printer;
+use crate::printer::{Printer, Stat};
+use crate::timeout_stream::TimeoutStream;
-pub struct RoutingTable {
- v4_table: BTreeMap<(Ipv4Addr, u8, u32), Arc<Vec<PathAttribute>>>,
- v6_table: BTreeMap<(Ipv6Addr, u8, u32), Arc<Vec<PathAttribute>>>,
+const PATH_SUFFIX_LEN: usize = 3;
+#[derive(Clone)]
+struct Route { // 32 bytes
+ path_suffix: [u32; PATH_SUFFIX_LEN],
+ path_len: u32,
+ pref: u32,
+ med: u32,
+}
+
+struct RoutingTable {
+ v4_table: HashMap<(Ipv4Addr, u8), HashMap<u32, Route>>,
+ v6_table: HashMap<(Ipv6Addr, u8), HashMap<u32, Route>>,
}
impl RoutingTable {
fn new() -> Self {
Self {
- v4_table: BTreeMap::new(),
- v6_table: BTreeMap::new(),
+ v4_table: HashMap::new(),
+ v6_table: HashMap::new(),
}
}
- fn get_route_attrs(&self, ip: IpAddr) -> Vec<Arc<Vec<PathAttribute>>> {
+ fn get_route_attrs(&self, ip: IpAddr) -> (u8, Vec<&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() {
+ //TODO: Optimize this (probably means making the tables btrees)!
+ 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)))) {
- res.push(Arc::clone(&attrs.1));
+ if let Some(routes) = $table.get(&(lookup_addr, $addr_bits - i as u8)).map(|hm| hm.values()) {
+ if routes.len() > 0 {
+ return ($addr_bits - i as u8, routes.collect());
+ }
}
- if !res.is_empty() { break; }
}
- res
+ (0, vec![])
} }
}
match ip {
NLRIEncoding::IP(p) => {
let (ip, len) = <(IpAddr, u8)>::from(&p);
match ip {
- IpAddr::V4(v4a) => self.v4_table.remove(&(v4a, len, 0)),
- IpAddr::V6(v6a) => self.v6_table.remove(&(v6a, len, 0)),
+ IpAddr::V4(v4a) => self.v4_table.get_mut(&(v4a, len)).and_then(|hm| hm.remove(&0)),
+ IpAddr::V6(v6a) => self.v6_table.get_mut(&(v6a, len)).and_then(|hm| hm.remove(&0)),
}
},
NLRIEncoding::IP_WITH_PATH_ID((p, id)) => {
let (ip, len) = <(IpAddr, u8)>::from(&p);
match ip {
- IpAddr::V4(v4a) => self.v4_table.remove(&(v4a, len, id)),
- IpAddr::V6(v6a) => self.v6_table.remove(&(v6a, len, id)),
+ IpAddr::V4(v4a) => self.v4_table.get_mut(&(v4a, len)).and_then(|hm| hm.remove(&id)),
+ IpAddr::V6(v6a) => self.v6_table.get_mut(&(v6a, len)).and_then(|hm| hm.remove(&id)),
}
},
NLRIEncoding::IP_MPLS(_) => None,
};
}
- fn announce(&mut self, route: NLRIEncoding, attrs: Arc<Vec<PathAttribute>>) {
- match route {
+ fn announce(&mut self, prefix: NLRIEncoding, route: 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.entry((v4a, len)).or_insert(HashMap::new()).insert(0, route),
+ IpAddr::V6(v6a) => self.v6_table.entry((v6a, len)).or_insert(HashMap::new()).insert(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.entry((v4a, len)).or_insert(HashMap::new()).insert(id, route),
+ IpAddr::V6(v6a) => self.v6_table.entry((v6a, len)).or_insert(HashMap::new()).insert(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 lock = self.routes.lock().unwrap();
+ let mut path_vecs = lock.get_route_attrs(addr).1;
+ 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_suffix.iter().rev() {
+ if *asn == 0 { continue 'asn_candidates; }
+ for secondary_route in path_vecs.iter() {
+ if !secondary_route.path_suffix.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; }
- let mut path_vecs: Vec<_> = paths.iter_mut().map(|(p, pref, med)| {
- let mut path = Vec::new();
- for seg in p.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
- }
+ for asn in primary_route.path_suffix.iter().rev() {
+ if *asn != 0 {
+ return *asn;
}
- (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))
+ }
+ 0
+ }
+
+ pub fn get_path(&self, addr: IpAddr) -> (u8, [u32; PATH_SUFFIX_LEN]) {
+ let lock = self.routes.lock().unwrap();
+ let (prefixlen, mut path_vecs) = lock.get_route_attrs(addr);
+ if path_vecs.is_empty() { return (0, [0; PATH_SUFFIX_LEN]); }
+
+ 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))
});
- // TODO: Find last common ASN among all paths
- *path_vecs[0].0.last().unwrap_or(&0)
+
+ let primary_route = path_vecs.pop().unwrap();
+ (prefixlen, primary_route.path_suffix)
}
pub fn disconnect(&self) {
self.shutdown.store(true, Ordering::Relaxed);
}
+ 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 pathvec = Vec::new();
+ for seg in aspath.segments.drain(..) {
+ match seg {
+ Segment::AS_SEQUENCE(mut asn) => pathvec.append(&mut asn),
+ Segment::AS_SET(_) => {}, // Ignore sets for now, they're not that common anyway
+ }
+ }
+ let path_len = pathvec.len() as u32;
+ pathvec.dedup_by(|a, b| (*a).eq(b)); // Drop prepends, cause we don't care in this case
+
+ let mut path_suffix = [0; PATH_SUFFIX_LEN];
+ for (idx, asn) in pathvec.iter().rev().enumerate() {
+ path_suffix[PATH_SUFFIX_LEN - idx - 1] = *asn;
+ if idx == PATH_SUFFIX_LEN - 1 { break; }
+ }
+
+ return Some(Route {
+ path_suffix,
+ path_len,
+ pref,
+ med,
+ })
+ } else { None }
+ }
+
fn connect_given_client(addr: SocketAddr, timeout: Duration, printer: &'static Printer, client: Arc<BGPClient>) {
- let connect_timeout = Delay::new(Instant::now() + timeout.clone()).then(|_| {
- future::err(std::io::Error::new(std::io::ErrorKind::TimedOut, "timeout reached"))
- });
- let client_reconn = Arc::clone(&client);
- tokio::spawn(TcpStream::connect(&addr).select(connect_timeout)
- .or_else(move |_| {
- Delay::new(Instant::now() + timeout / 10).then(|_| {
- future::err(())
- })
- }).and_then(move |stream| {
- let (write, read) = Framed::new(stream.0, MsgCoder(printer)).split();
- let (mut sender, receiver) = mpsc::channel(10); // We never really should send more than 10 messages unless they're dumb
- tokio::spawn(write.sink_map_err(|_| { () }).send_all(receiver)
- .then(|_| {
+ tokio::spawn(Delay::new(Instant::now() + timeout / 4).then(move |_| {
+ let connect_timeout = Delay::new(Instant::now() + timeout.clone()).then(|_| {
+ future::err(std::io::Error::new(std::io::ErrorKind::TimedOut, "timeout reached"))
+ });
+ let client_reconn = Arc::clone(&client);
+ TcpStream::connect(&addr).select(connect_timeout)
+ .or_else(move |_| {
+ Delay::new(Instant::now() + timeout / 2).then(|_| {
future::err(())
+ })
+ }).and_then(move |stream| {
+ let (write, read) = Framed::new(stream.0, MsgCoder(printer)).split();
+ let (mut sender, receiver) = mpsc::channel(10); // We never really should send more than 10 messages unless they're dumb
+ tokio::spawn(write.sink_map_err(|_| { () }).send_all(receiver)
+ .then(|_| {
+ future::err(())
+ }));
+ let _ = sender.try_send(Message::Open(Open {
+ version: 4,
+ peer_asn: 23456,
+ hold_timer: timeout.as_secs() as u16,
+ identifier: 0x453b1215, // 69.59.18.21
+ parameters: vec![OpenParameter::Capabilities(vec![
+ OpenCapability::MultiProtocol((AFI::IPV4, SAFI::Unicast)),
+ OpenCapability::MultiProtocol((AFI::IPV6, SAFI::Unicast)),
+ OpenCapability::FourByteASN(397444),
+ OpenCapability::RouteRefresh,
+ OpenCapability::AddPath(vec![
+ (AFI::IPV4, SAFI::Unicast, AddPathDirection::ReceivePaths),
+ (AFI::IPV6, SAFI::Unicast, AddPathDirection::ReceivePaths)]),
+ ])]
}));
- let _ = sender.try_send(Message::Open(Open {
- version: 4,
- peer_asn: 23456,
- hold_timer: 120,
- identifier: 0x453b1215, // 69.59.18.21
- parameters: vec![OpenParameter::Capabilities(vec![
- OpenCapability::MultiProtocol((AFI::IPV4, SAFI::Unicast)),
- OpenCapability::MultiProtocol((AFI::IPV6, SAFI::Unicast)),
- OpenCapability::FourByteASN(397444),
- OpenCapability::RouteRefresh,
- OpenCapability::AddPath(vec![
- (AFI::IPV4, SAFI::Unicast, AddPathDirection::ReceivePaths),
- (AFI::IPV6, SAFI::Unicast, AddPathDirection::ReceivePaths)]),
- ])]
- }));
- read.for_each(move |bgp_msg| {
- if client.shutdown.load(Ordering::Relaxed) {
- return future::err(std::io::Error::new(std::io::ErrorKind::Other, "Shutting Down"));
- }
- match bgp_msg {
- Message::Open(_) => {
- printer.add_line("Connected to BGP route provider".to_string(), true);
- },
- Message::KeepAlive => {
- let _ = sender.try_send(Message::KeepAlive);
- },
- Message::Update(mut upd) => {
- upd.normalize();
- let mut route_table = client.routes.lock().unwrap();
- 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));
- }
- },
- _ => {}
+ TimeoutStream::new_persistent(read, timeout).for_each(move |bgp_msg| {
+ if client.shutdown.load(Ordering::Relaxed) {
+ return future::err(std::io::Error::new(std::io::ErrorKind::Other, "Shutting Down"));
+ }
+ match bgp_msg {
+ Message::Open(_) => {
+ 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);
+ },
+ Message::Update(mut upd) => {
+ upd.normalize();
+ let mut route_table = client.routes.lock().unwrap();
+ for r in upd.withdrawn_routes {
+ route_table.withdraw(r);
+ }
+ if let Some(path) = Self::map_attrs(upd.attributes) {
+ for r in upd.announced_routes {
+ route_table.announce(r, path.clone());
+ }
+ }
+ printer.set_stat(Stat::V4RoutingTableSize(route_table.v4_table.len()));
+ printer.set_stat(Stat::V6RoutingTableSize(route_table.v6_table.len()));
+ },
+ _ => {}
+ }
+ future::ok(())
+ }).or_else(move |e| {
+ printer.add_line(format!("Got error from BGP stream: {:?}", e), true);
+ future::ok(())
+ })
+ }).then(move |_| {
+ if !client_reconn.shutdown.load(Ordering::Relaxed) {
+ BGPClient::connect_given_client(addr, timeout, printer, client_reconn);
}
future::ok(())
- }).or_else(move |e| {
- printer.add_line(format!("Got error from BGP stream: {:?}", e), true);
- future::ok(())
})
- }).then(move |_| {
- if !client_reconn.shutdown.load(Ordering::Relaxed) {
- BGPClient::connect_given_client(addr, timeout, printer, client_reconn);
- }
- future::ok(())
})
);
}
projects / dnsseed-rust / blobdiff