//export decode_path
func decode_path(p *C.path) *C.char {
var buf []byte
var nlri bgp.AddrPrefixInterface
if p.nlri.len > 0 {
buf = []byte(C.GoStringN(p.nlri.value, p.nlri.len))
nlri = &bgp.IPAddrPrefix{}
err := nlri.DecodeFromBytes(buf)
if err != nil {
return nil
}
}
pattrs := make([]bgp.PathAttributeInterface, 0, int(p.path_attributes_len))
for i := 0; i < int(p.path_attributes_len); i++ {
b := C.get_path_attribute(p, C.int(i))
buf = []byte(C.GoStringN(b.value, b.len))
pattr, err := bgp.GetPathAttribute(buf)
if err != nil {
return nil
}
err = pattr.DecodeFromBytes(buf)
if err != nil {
return nil
}
switch pattr.GetType() {
case bgp.BGP_ATTR_TYPE_MP_REACH_NLRI:
mpreach := pattr.(*bgp.PathAttributeMpReachNLRI)
if len(mpreach.Value) != 1 {
return nil
}
nlri = mpreach.Value[0]
}
pattrs = append(pattrs, pattr)
}
j, _ := json.Marshal(struct {
Nlri bgp.AddrPrefixInterface `json:"nlri"`
PathAttrs []bgp.PathAttributeInterface `json:"attrs"`
}{
Nlri: nlri,
PathAttrs: pattrs,
})
return C.CString(string(j))
}
func (s *Server) api2PathList(resource Resource, ApiPathList []*Path) ([]*table.Path, error) {
var nlri bgp.AddrPrefixInterface
var nexthop string
var pi *table.PeerInfo
pathList := make([]*table.Path, 0, len(ApiPathList))
for _, path := range ApiPathList {
seen := make(map[bgp.BGPAttrType]bool)
pattr := make([]bgp.PathAttributeInterface, 0)
extcomms := make([]bgp.ExtendedCommunityInterface, 0)
if path.SourceAsn != 0 {
pi = &table.PeerInfo{
AS: path.SourceAsn,
LocalID: net.ParseIP(path.SourceId),
}
}
if len(path.Nlri) > 0 {
nlri = &bgp.IPAddrPrefix{}
err := nlri.DecodeFromBytes(path.Nlri)
if err != nil {
return nil, err
}
}
for _, attr := range path.Pattrs {
p, err := bgp.GetPathAttribute(attr)
if err != nil {
return nil, err
}
err = p.DecodeFromBytes(attr)
if err != nil {
return nil, err
}
if _, ok := seen[p.GetType()]; !ok {
seen[p.GetType()] = true
} else {
return nil, fmt.Errorf("the path attribute apears twice. Type : " + strconv.Itoa(int(p.GetType())))
}
switch p.GetType() {
case bgp.BGP_ATTR_TYPE_NEXT_HOP:
nexthop = p.(*bgp.PathAttributeNextHop).Value.String()
case bgp.BGP_ATTR_TYPE_EXTENDED_COMMUNITIES:
value := p.(*bgp.PathAttributeExtendedCommunities).Value
if len(value) > 0 {
extcomms = append(extcomms, value...)
}
case bgp.BGP_ATTR_TYPE_MP_REACH_NLRI:
mpreach := p.(*bgp.PathAttributeMpReachNLRI)
if len(mpreach.Value) != 1 {
return nil, fmt.Errorf("include only one route in mp_reach_nlri")
}
nlri = mpreach.Value[0]
nexthop = mpreach.Nexthop.String()
default:
pattr = append(pattr, p)
}
}
if nlri == nil || nexthop == "" {
return nil, fmt.Errorf("not found nlri or nexthop")
}
rf := bgp.AfiSafiToRouteFamily(nlri.AFI(), nlri.SAFI())
if resource != Resource_VRF && rf == bgp.RF_IPv4_UC {
pattr = append(pattr, bgp.NewPathAttributeNextHop(nexthop))
} else {
pattr = append(pattr, bgp.NewPathAttributeMpReachNLRI(nexthop, []bgp.AddrPrefixInterface{nlri}))
}
if len(extcomms) > 0 {
pattr = append(pattr, bgp.NewPathAttributeExtendedCommunities(extcomms))
}
newPath := table.NewPath(pi, nlri, path.IsWithdraw, pattr, time.Now(), path.NoImplicitWithdraw)
newPath.SetIsFromExternal(path.IsFromExternal)
pathList = append(pathList, newPath)
}
return pathList, 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
}