func NewDestination(nlri bgp.AddrPrefixInterface) *Destination {
d := &Destination{
routeFamily: bgp.AfiSafiToRouteFamily(nlri.AFI(), nlri.SAFI()),
nlri: nlri,
knownPathList: make([]*Path, 0),
withdrawList: make([]*Path, 0),
newPathList: make([]*Path, 0),
}
switch d.routeFamily {
case bgp.RF_IPv4_UC, bgp.RF_IPv6_UC:
d.RadixKey = CidrToRadixkey(nlri.String())
}
return d
}
func NewPath(source *PeerInfo, nlri bgp.AddrPrefixInterface, isWithdraw bool, pattrs []bgp.PathAttributeInterface, timestamp time.Time, noImplicitWithdraw bool) *Path {
if !isWithdraw && pattrs == nil {
log.WithFields(log.Fields{
"Topic": "Table",
"Key": nlri.String(),
"Peer": source.Address.String(),
}).Error("Need to provide patattrs for the path that is not withdraw.")
return nil
}
if nlri != nil && (nlri.SAFI() == bgp.SAFI_FLOW_SPEC_UNICAST || nlri.SAFI() == bgp.SAFI_FLOW_SPEC_VPN) {
var coms FlowSpecComponents
var f *bgp.FlowSpecNLRI
switch nlri.(type) {
case *bgp.FlowSpecIPv4Unicast:
f = &nlri.(*bgp.FlowSpecIPv4Unicast).FlowSpecNLRI
case *bgp.FlowSpecIPv4VPN:
f = &nlri.(*bgp.FlowSpecIPv4VPN).FlowSpecNLRI
case *bgp.FlowSpecIPv6Unicast:
f = &nlri.(*bgp.FlowSpecIPv6Unicast).FlowSpecNLRI
case *bgp.FlowSpecIPv6VPN:
f = &nlri.(*bgp.FlowSpecIPv6VPN).FlowSpecNLRI
}
if f != nil {
coms = f.Value
sort.Sort(coms)
}
}
return &Path{
info: &originInfo{
nlri: nlri,
source: source,
timestamp: timestamp,
noImplicitWithdraw: noImplicitWithdraw,
},
IsWithdraw: isWithdraw,
pathAttrs: pattrs,
filtered: make(map[string]PolicyDirection),
}
}
func (t *Table) tableKey(nlri bgp.AddrPrefixInterface) string {
return nlri.String()
}
//modrib receives route updates from BGP server and adds the endpoint
func (self *OfnetBgp) modRib(path *table.Path) error {
var nlri bgp.AddrPrefixInterface
var nextHop string
var macAddrStr string
var portNo uint32
nlri = path.GetNlri()
nextHop = path.GetNexthop().String()
if nextHop == "0.0.0.0" {
return nil
}
if nlri == nil {
return fmt.Errorf("no nlri")
}
endpointIPNet, _ := netlink.ParseIPNet(nlri.String())
log.Infof("Bgp Rib Received endpoint update for path %s", path.String())
//check if bgp published a route local to the host
epid := self.agent.getEndpointIdByIpVrf(endpointIPNet.IP.Mask(endpointIPNet.Mask), "default")
//Check if the route is local
if nextHop == self.routerIP {
log.Debugf("This is a local route skipping endpoint create! ")
return nil
} else if ep := self.agent.getEndpointByID(epid); ep != nil {
if ep.EndpointType != "external" {
log.Debugf("Endpoint was learnt via internal protocol. skipping update! ")
return nil
}
}
nhEpid := self.agent.getEndpointIdByIpVrf(net.ParseIP(nextHop), "default")
if ep := self.agent.getEndpointByID(nhEpid); ep == nil {
//the nexthop is not the directly connected eBgp peer
macAddrStr = ""
portNo = 0
} else {
macAddrStr = ep.MacAddrStr
portNo = ep.PortNo
}
ipmask := net.ParseIP("255.255.255.255").Mask(endpointIPNet.Mask)
if path.IsWithdraw != true {
epreg := &OfnetEndpoint{
EndpointID: epid,
EndpointType: "external",
IpAddr: endpointIPNet.IP,
IpMask: ipmask,
Vrf: "default", // FIXME set VRF correctly
MacAddrStr: macAddrStr,
Vlan: 1,
OriginatorIp: self.agent.localIp,
PortNo: portNo,
Timestamp: time.Now(),
}
// Install the endpoint in datapath
// First, add the endpoint to local routing table
self.agent.endpointDb.Set(epreg.EndpointID, epreg)
err := self.agent.datapath.AddEndpoint(epreg)
if err != nil {
log.Errorf("Error adding endpoint: {%+v}. Err: %v", epreg, err)
return err
}
} else {
log.Info("Received route withdraw from BGP for ", endpointIPNet)
endpoint := self.agent.getEndpointByIpVrf(endpointIPNet.IP, "default")
if endpoint != nil {
self.agent.datapath.RemoveEndpoint(endpoint)
self.agent.endpointDb.Remove(endpoint.EndpointID)
}
}
return nil
}
//modrib receives route updates from BGP server and adds the endpoint
func (self *OfnetBgp) modRib(path *api.Path) error {
var nlri bgp.AddrPrefixInterface
var nextHop string
var macAddrStr string
var portNo uint32
if len(path.Nlri) > 0 {
nlri = &bgp.IPAddrPrefix{}
err := nlri.DecodeFromBytes(path.Nlri)
if err != nil {
return err
}
}
for _, attr := range path.Pattrs {
p, err := bgp.GetPathAttribute(attr)
if err != nil {
return err
}
err = p.DecodeFromBytes(attr)
if err != nil {
return err
}
if p.GetType() == bgp.BGP_ATTR_TYPE_NEXT_HOP {
nextHop = p.(*bgp.PathAttributeNextHop).Value.String()
break
}
}
if nextHop == "0.0.0.0" {
return nil
}
if nlri == nil {
return fmt.Errorf("no nlri")
}
endpointIPNet, _ := netlink.ParseIPNet(nlri.String())
log.Infof("Bgp Rib Received endpoint update for %v , with nexthop %v",
endpointIPNet, nextHop)
if endpointIPNet == nil {
return nil
}
//check if bgp published a route local to the host
epid := self.agent.getEndpointIdByIpVrf(endpointIPNet.IP.Mask(endpointIPNet.Mask), "default")
//Check if the route is local
if nextHop == self.routerIP {
log.Info("This is a local route skipping endpoint create! ")
return nil
} else if self.agent.endpointDb[epid] != nil {
if self.agent.endpointDb[epid].EndpointType != "external" {
log.Info("Endpoint was learnt via internal protocol. skipping update! ")
return nil
}
}
nhEpid := self.agent.getEndpointIdByIpVrf(net.ParseIP(nextHop), "default")
if self.agent.endpointDb[nhEpid] == nil {
//the nexthop is not the directly connected eBgp peer
macAddrStr = ""
portNo = 0
} else {
macAddrStr = self.agent.endpointDb[nhEpid].MacAddrStr
portNo = self.agent.endpointDb[nhEpid].PortNo
}
ipmask := net.ParseIP("255.255.255.255").Mask(endpointIPNet.Mask)
if path.IsWithdraw != true {
epreg := &OfnetEndpoint{
EndpointID: epid,
EndpointType: "external",
IpAddr: endpointIPNet.IP,
IpMask: ipmask,
Vrf: "default", // FIXME set VRF correctly
MacAddrStr: macAddrStr,
Vlan: 1,
OriginatorIp: self.agent.localIp,
PortNo: portNo,
Timestamp: time.Now(),
}
// Install the endpoint in datapath
// First, add the endpoint to local routing table
self.agent.endpointDb[epreg.EndpointID] = epreg
err := self.agent.datapath.AddEndpoint(epreg)
if err != nil {
log.Errorf("Error adding endpoint: {%+v}. Err: %v", epreg, err)
return err
}
} else {
log.Info("Received route withdraw from BGP for ", endpointIPNet)
endpoint := self.agent.getEndpointByIpVrf(endpointIPNet.IP, "default")
if endpoint != nil {
self.agent.datapath.RemoveEndpoint(endpoint)
delete(self.agent.endpointDb, endpoint.EndpointID)
}
}
return nil
}