josh/jrouter
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Send RI-Upds to peers #14

Merged
josh merged 3 commits from route-updates into main 2024-06-07 16:02:23 +10:00
Conversation 0 Commits 3 Files changed 4 +145 -55
4 changed files with 145 additions and 55 deletions
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25
main.go
View file

@ -297,18 +297,7 @@ func main() {
continue
}
peer := &router.AURPPeer{
Transport: &aurp.Transport{
LocalDI: localDI,
RemoteDI: aurp.IPDomainIdentifier(raddr.IP),
LocalConnID: nextConnID,
},
UDPConn: ln,
ConfiguredAddr: peerStr,
RemoteAddr: raddr,
ReceiveCh: make(chan aurp.Packet, 1024),
RouteTable: routes,
}
peer := router.NewAURPPeer(routes, ln, peerStr, raddr, localDI, nil, nextConnID)
aurp.Inc(&nextConnID)
peersMu.Lock()
peers[udpAddrFromNet(raddr)] = peer
@ -404,17 +393,7 @@ func main() {
continue
}
// New peer!
pr = &router.AURPPeer{
Transport: &aurp.Transport{
LocalDI: localDI,
RemoteDI: dh.SourceDI, // platinum rule
LocalConnID: nextConnID,
},
UDPConn: ln,
RemoteAddr: raddr,
ReceiveCh: make(chan aurp.Packet, 1024),
RouteTable: routes,
}
pr = router.NewAURPPeer(routes, ln, "", raddr, localDI, dh.SourceDI, nextConnID)
aurp.Inc(&nextConnID)
peers[ra] = pr
goPeerHandler(pr)

90
router/peer_aurp.go
View file

@ -114,6 +114,10 @@ type AURPPeer struct {
// Route table (the peer will add/remove/update routes and zones)
RouteTable *RouteTable
// Event tuples yet to be sent to this peer in an RI-Upd.
pendingEventsMu sync.Mutex
pendingEvents aurp.EventTuples
// The internal states below are only set within the Handle loop, but can
// be read concurrently from outside.
mu sync.RWMutex
@ -126,6 +130,61 @@ type AURPPeer struct {
sendRetries int
}
func NewAURPPeer(routes *RouteTable, udpConn *net.UDPConn, peerAddr string, raddr *net.UDPAddr, localDI, remoteDI aurp.DomainIdentifier, connID uint16) *AURPPeer {
if remoteDI == nil {
remoteDI = aurp.IPDomainIdentifier(raddr.IP)
}
return &AURPPeer{
Transport: &aurp.Transport{
LocalDI: localDI,
RemoteDI: remoteDI,
LocalConnID: connID,
},
UDPConn: udpConn,
ConfiguredAddr: peerAddr,
RemoteAddr: raddr,
ReceiveCh: make(chan aurp.Packet, 1024),
RouteTable: routes,
}
}
func (p *AURPPeer) addPendingEvent(ec aurp.EventCode, route *Route) {
// Don't advertise routes to AURP peers to other AURP peers
if route.AURPPeer != nil {
return
}
et := aurp.EventTuple{
EventCode: ec,
Extended: route.Extended,
RangeStart: route.NetStart,
Distance: route.Distance,
RangeEnd: route.NetEnd,
}
switch ec {
case aurp.EventCodeND, aurp.EventCodeNRC:
et.Distance = 0 // "The distance field does not apply to ND or NRC event tuples and should be set to 0."
}
p.pendingEventsMu.Lock()
defer p.pendingEventsMu.Unlock()
p.pendingEvents = append(p.pendingEvents, et)
}
func (p *AURPPeer) RouteAdded(route *Route) {
p.addPendingEvent(aurp.EventCodeNA, route)
}
func (p *AURPPeer) RouteDeleted(route *Route) {
p.addPendingEvent(aurp.EventCodeND, route)
}
func (p *AURPPeer) RouteDistanceChanged(route *Route) {
p.addPendingEvent(aurp.EventCodeNDC, route)
}
func (p *AURPPeer) RouteForwarderChanged(route *Route) {
p.addPendingEvent(aurp.EventCodeNRC, route)
}
func (p *AURPPeer) Forward(ddpkt *ddp.ExtPacket) error {
outPkt, err := ddp.ExtMarshal(*ddpkt)
if err != nil {
@ -243,6 +302,9 @@ func (p *AURPPeer) send(pkt aurp.Packet) (int, error) {
}
func (p *AURPPeer) Handle(ctx context.Context) error {
// Stop listening to events if the goroutine exits
defer p.RouteTable.RemoveObserver(p)
rticker := time.NewTicker(1 * time.Second)
defer rticker.Stop()
sticker := time.NewTicker(1 * time.Second)
@ -411,8 +473,29 @@ func (p *AURPPeer) Handle(ctx context.Context) error {
if time.Since(p.lastUpdate) <= updateTimer {
break
}
// TODO: is there a routing update to send?
// Are there routing updates to send?
p.pendingEventsMu.Lock()
if len(p.pendingEvents) == 0 {
p.pendingEventsMu.Unlock()
break
}
// Yes - swap the slices, release the mutex, then send them
pending := p.pendingEvents
p.pendingEvents = make(aurp.EventTuples, 0, cap(pending))
p.pendingEventsMu.Unlock()
// TODO: eliminate events that cancel out (e.g. NA then ND)
// TODO: split pending events to fit within a packet
p.bumpLastUpdate()
aurp.Inc(&p.Transport.LocalSeq)
lastRISent = p.Transport.NewRIUpdPacket(pending)
if _, err := p.send(lastRISent); err != nil {
log.Printf("AURP Peer: Couldn't send RI-Upd packet: %v", err)
return err
}
p.setSState(SenderWaitForRIUpdAck)
case SenderWaitForRIRspAck, SenderWaitForRIUpdAck:
if time.Since(p.lastSend) <= sendRetryTimer {
@ -425,6 +508,7 @@ func (p *AURPPeer) Handle(ctx context.Context) error {
if p.sendRetries >= sendRetryLimit {
log.Printf("AURP Peer: Send retry limit reached, closing connection")
p.setSState(SenderUnconnected)
p.RouteTable.RemoveObserver(p)
continue
}
p.incSendRetries()
@ -439,6 +523,7 @@ func (p *AURPPeer) Handle(ctx context.Context) error {
break
}
p.setSState(SenderUnconnected)
p.RouteTable.RemoveObserver(p)
}
case pkt := <-p.ReceiveCh:
@ -474,7 +559,9 @@ func (p *AURPPeer) Handle(ctx context.Context) error {
return err
}
if orsp.RateOrErrCode >= 0 {
// Data sender is successfully in connected state
p.setSState(SenderConnected)
p.RouteTable.AddObserver(p)
}
// If receiver is unconnected, commence connecting
@ -578,6 +665,7 @@ func (p *AURPPeer) Handle(ctx context.Context) error {
p.setSState(SenderConnected)
p.resetSendRetries()
p.RouteTable.AddObserver(p)
// If SZI flag is set, send ZI-Rsp (transaction)
if pkt.Flags&aurp.RoutingFlagSendZoneInfo != 0 {

69
router/route.go
View file

@ -55,17 +55,40 @@ func (r *Route) Valid() bool {
return len(r.ZoneNames) > 0 && (r.EtherTalkPeer == nil || time.Since(r.LastSeen) <= maxRouteAge)
}
type RouteTableObserver interface {
RouteAdded(*Route)
RouteDeleted(*Route)
RouteDistanceChanged(*Route)
RouteForwarderChanged(*Route)
}
type RouteTable struct {
mu sync.Mutex
routes map[*Route]struct{}
routesMu sync.RWMutex
routes map[*Route]struct{}
observersMu sync.RWMutex
observers map[RouteTableObserver]struct{}
}
func NewRouteTable() *RouteTable {
return &RouteTable{
routes: make(map[*Route]struct{}),
routes: make(map[*Route]struct{}),
observers: make(map[RouteTableObserver]struct{}),
}
}
func (rt *RouteTable) AddObserver(obs RouteTableObserver) {
rt.observersMu.Lock()
defer rt.observersMu.Unlock()
rt.observers[obs] = struct{}{}
}
func (rt *RouteTable) RemoveObserver(obs RouteTableObserver) {
rt.observersMu.Lock()
defer rt.observersMu.Unlock()
delete(rt.observers, obs)
}
func (rt *RouteTable) InsertEtherTalkDirect(port *EtherTalkPort) {
r := &Route{
Extended: true,
@ -77,14 +100,14 @@ func (rt *RouteTable) InsertEtherTalkDirect(port *EtherTalkPort) {
EtherTalkDirect: port,
}
rt.mu.Lock()
defer rt.mu.Unlock()
rt.routesMu.Lock()
defer rt.routesMu.Unlock()
rt.routes[r] = struct{}{}
}
func (rt *RouteTable) Dump() []Route {
rt.mu.Lock()
defer rt.mu.Unlock()
rt.routesMu.Lock()
defer rt.routesMu.Unlock()
table := make([]Route, 0, len(rt.routes))
for r := range rt.routes {
@ -94,8 +117,8 @@ func (rt *RouteTable) Dump() []Route {
}
func (rt *RouteTable) LookupRoute(network ddp.Network) *Route {
rt.mu.Lock()
defer rt.mu.Unlock()
rt.routesMu.Lock()
defer rt.routesMu.Unlock()
var bestRoute *Route
for r := range rt.routes {
@ -117,8 +140,8 @@ func (rt *RouteTable) LookupRoute(network ddp.Network) *Route {
}
func (rt *RouteTable) DeleteAURPPeer(peer *AURPPeer) {
rt.mu.Lock()
defer rt.mu.Unlock()
rt.routesMu.Lock()
defer rt.routesMu.Unlock()
for route := range rt.routes {
if route.AURPPeer == peer {
@ -128,8 +151,8 @@ func (rt *RouteTable) DeleteAURPPeer(peer *AURPPeer) {
}
func (rt *RouteTable) DeleteAURPPeerNetwork(peer *AURPPeer, network ddp.Network) {
rt.mu.Lock()
defer rt.mu.Unlock()
rt.routesMu.Lock()
defer rt.routesMu.Unlock()
for route := range rt.routes {
if route.AURPPeer == peer && route.NetStart == network {
@ -139,8 +162,8 @@ func (rt *RouteTable) DeleteAURPPeerNetwork(peer *AURPPeer, network ddp.Network)
}
func (rt *RouteTable) UpdateAURPRouteDistance(peer *AURPPeer, network ddp.Network, distance uint8) {
rt.mu.Lock()
defer rt.mu.Unlock()
rt.routesMu.Lock()
defer rt.routesMu.Unlock()
for route := range rt.routes {
if route.AURPPeer == peer && route.NetStart == network {
@ -158,8 +181,8 @@ func (rt *RouteTable) UpsertEtherTalkRoute(peer *EtherTalkPeer, extended bool, n
return nil, fmt.Errorf("invalid network range [%d, %d] for nonextended network", netStart, netEnd)
}
rt.mu.Lock()
defer rt.mu.Unlock()
rt.routesMu.Lock()
defer rt.routesMu.Unlock()
// Update?
for r := range rt.routes {
@ -210,16 +233,16 @@ func (rt *RouteTable) InsertAURPRoute(peer *AURPPeer, extended bool, netStart, n
AURPPeer: peer,
}
rt.mu.Lock()
defer rt.mu.Unlock()
rt.routesMu.Lock()
defer rt.routesMu.Unlock()
rt.routes[r] = struct{}{}
return nil
}
// ValidRoutes returns all valid routes.
func (rt *RouteTable) ValidRoutes() []*Route {
rt.mu.Lock()
defer rt.mu.Unlock()
rt.routesMu.RLock()
defer rt.routesMu.RUnlock()
valid := make([]*Route, 0, len(rt.routes))
for r := range rt.routes {
if r.Valid() {
@ -231,8 +254,8 @@ func (rt *RouteTable) ValidRoutes() []*Route {
// ValidNonAURPRoutes returns all valid routes that were not learned via AURP.
func (rt *RouteTable) ValidNonAURPRoutes() []*Route {
rt.mu.Lock()
defer rt.mu.Unlock()
rt.routesMu.RLock()
defer rt.routesMu.RUnlock()
valid := make([]*Route, 0, len(rt.routes))
for r := range rt.routes {
if r.AURPPeer != nil {

16
router/zones.go
View file

@ -23,8 +23,8 @@ import (
)
func (rt *RouteTable) AddZonesToNetwork(n ddp.Network, zs ...string) {
rt.mu.Lock()
defer rt.mu.Unlock()
rt.routesMu.Lock()
defer rt.routesMu.Unlock()
for r := range rt.routes {
if n < r.NetStart || n > r.NetEnd {
continue
@ -39,8 +39,8 @@ func (rt *RouteTable) AddZonesToNetwork(n ddp.Network, zs ...string) {
func (rt *RouteTable) ZonesForNetworks(ns []ddp.Network) map[ddp.Network][]string {
zs := make(map[ddp.Network][]string)
rt.mu.Lock()
defer rt.mu.Unlock()
rt.routesMu.Lock()
defer rt.routesMu.Unlock()
for r := range rt.routes {
if !r.Valid() {
continue
@ -55,8 +55,8 @@ func (rt *RouteTable) ZonesForNetworks(ns []ddp.Network) map[ddp.Network][]strin
}
func (rt *RouteTable) RoutesForZone(zone string) []*Route {
rt.mu.Lock()
defer rt.mu.Unlock()
rt.routesMu.Lock()
defer rt.routesMu.Unlock()
var routes []*Route
for r := range rt.routes {
@ -73,8 +73,8 @@ func (rt *RouteTable) RoutesForZone(zone string) []*Route {
func (rt *RouteTable) AllZoneNames() (zones []string) {
defer slices.Sort(zones)
rt.mu.Lock()
defer rt.mu.Unlock()
rt.routesMu.Lock()
defer rt.routesMu.Unlock()
zs := make(StringSet)
for r := range rt.routes {