func applyPolicy(component, owner string, d Direction, policies []*policy.Policy, original *table.Path) (bool, *table.Path) {
var applied bool = true
for _, pol := range policies {
if result, action, newpath := pol.Apply(original); result {
log.Debug("newpath: ", newpath)
if action == policy.ROUTE_TYPE_REJECT {
log.WithFields(log.Fields{
"Topic": component,
"Key": owner,
"NRLI": original.GetNlri(),
"Dir": d,
}).Debug("path was rejected")
// return applied, nil, this means path was rejected
return applied, nil
} else {
// return applied, new path
return applied, newpath
}
}
}
log.WithFields(log.Fields{
"Topic": component,
"Key": owner,
"Len": len(policies),
"NRLI": original,
"Dir": d,
}).Debug("no policy applied")
return !applied, original
}
func ToPathApi(path *table.Path) *Path {
nlri := path.GetNlri()
n, _ := nlri.Serialize()
family := uint32(bgp.AfiSafiToRouteFamily(nlri.AFI(), nlri.SAFI()))
pattrs := func(arg []bgp.PathAttributeInterface) [][]byte {
ret := make([][]byte, 0, len(arg))
for _, a := range arg {
aa, _ := a.Serialize()
ret = append(ret, aa)
}
return ret
}(path.GetPathAttrs())
return &Path{
Nlri: n,
Pattrs: pattrs,
Age: path.GetTimestamp().Unix(),
IsWithdraw: path.IsWithdraw,
Validation: int32(path.Validation().ToInt()),
Filtered: path.Filtered("") == table.POLICY_DIRECTION_IN,
Family: family,
SourceAsn: path.GetSource().AS,
SourceId: path.GetSource().ID.String(),
NeighborIp: path.GetSource().Address.String(),
Stale: path.IsStale(),
IsFromExternal: path.IsFromExternal(),
}
}
func newIPRouteMessage(path *table.Path) *zebra.Message {
l := strings.SplitN(path.GetNlri().String(), "/", 2)
var command zebra.API_TYPE
var prefix net.IP
nexthops := []net.IP{}
switch path.GetRouteFamily() {
case bgp.RF_IPv4_UC:
if path.IsWithdraw == true {
command = zebra.IPV4_ROUTE_DELETE
} else {
command = zebra.IPV4_ROUTE_ADD
}
prefix = net.ParseIP(l[0]).To4()
nexthops = append(nexthops, path.GetNexthop().To4())
case bgp.RF_IPv6_UC:
if path.IsWithdraw == true {
command = zebra.IPV6_ROUTE_DELETE
} else {
command = zebra.IPV6_ROUTE_ADD
}
prefix = net.ParseIP(l[0]).To16()
nexthops = append(nexthops, path.GetNexthop().To16())
default:
return nil
}
flags := uint8(zebra.MESSAGE_NEXTHOP)
plen, _ := strconv.Atoi(l[1])
med, err := path.GetMed()
if err == nil {
flags |= zebra.MESSAGE_METRIC
}
return &zebra.Message{
Header: zebra.Header{
Len: zebra.HEADER_SIZE,
Marker: zebra.HEADER_MARKER,
Version: zebra.VERSION,
Command: command,
},
Body: &zebra.IPRouteBody{
Type: zebra.ROUTE_BGP,
SAFI: zebra.SAFI_UNICAST,
Message: flags,
Prefix: prefix,
PrefixLength: uint8(plen),
Nexthops: nexthops,
Metric: med,
},
}
}
func path2data(path *table.Path) (map[string]interface{}, map[string]string) {
fields := map[string]interface{}{
"RouterID": path.GetSource().ID,
}
if asPath := path.GetAsPath(); asPath != nil {
fields["ASPath"] = asPath.String()
}
if origin, err := path.GetOrigin(); err == nil {
typ := "-"
switch origin {
case bgp.BGP_ORIGIN_ATTR_TYPE_IGP:
typ = "i"
case bgp.BGP_ORIGIN_ATTR_TYPE_EGP:
typ = "e"
case bgp.BGP_ORIGIN_ATTR_TYPE_INCOMPLETE:
typ = "?"
}
fields["Origin"] = typ
}
if med, err := path.GetMed(); err == nil {
fields["Med"] = med
}
tags := map[string]string{
"PeerAddress": path.GetSource().Address.String(),
"PeerAS": fmt.Sprintf("%v", path.GetSource().AS),
"Timestamp": path.GetTimestamp().String(),
}
if nexthop := path.GetNexthop(); len(nexthop) > 0 {
fields["NextHop"] = nexthop.String()
}
if originAS := path.GetSourceAs(); originAS != 0 {
fields["OriginAS"] = fmt.Sprintf("%v", originAS)
}
if err := bgp.FlatUpdate(tags, path.GetNlri().Flat()); err != nil {
log.Error(err)
}
for _, p := range path.GetPathAttrs() {
if err := bgp.FlatUpdate(tags, p.Flat()); err != nil {
log.Error(err)
}
}
return fields, tags
}
func path2data(path *table.Path) (map[string]interface{}, map[string]string) {
fields := map[string]interface{}{
"ASPath": path.GetAsPath().String(),
}
if origin, err := path.GetOrigin(); err == nil {
typ := "-"
switch origin {
case bgp.BGP_ORIGIN_ATTR_TYPE_IGP:
typ = "i"
case bgp.BGP_ORIGIN_ATTR_TYPE_EGP:
typ = "e"
case bgp.BGP_ORIGIN_ATTR_TYPE_INCOMPLETE:
typ = "?"
}
fields["Origin"] = typ
}
if med, err := path.GetMed(); err == nil {
fields["Med"] = med
}
var prefix, prefixLen string
l := strings.Split(path.GetNlri().String(), "/")
if len(l) == 2 {
prefix = l[0]
prefixLen = l[1]
}
tags := map[string]string{
"PeerAddress": path.GetSource().Address.String(),
"PeerAS": fmt.Sprintf("%v", path.GetSource().AS),
"Prefix": prefix,
"PrefixLen": prefixLen,
"NextHop": path.GetNexthop().String(),
"OriginAS": fmt.Sprintf("%v", path.GetSourceAs()),
"Timestamp": path.GetTimestamp().String(),
}
return fields, tags
}
func ipPrefixCalculate(path *table.Path, cPrefix Prefix) bool {
rf := path.GetRouteFamily()
log.Debug("path routefamily : ", rf.String())
var pAddr net.IP
var pMasklen uint8
if rf != cPrefix.AddressFamily {
return false
}
switch rf {
case bgp.RF_IPv4_UC:
pAddr = path.GetNlri().(*bgp.NLRInfo).IPAddrPrefix.Prefix
pMasklen = path.GetNlri().(*bgp.NLRInfo).IPAddrPrefix.Length
case bgp.RF_IPv6_UC:
pAddr = path.GetNlri().(*bgp.IPv6AddrPrefix).Prefix
pMasklen = path.GetNlri().(*bgp.IPv6AddrPrefix).Length
default:
return false
}
cp := fmt.Sprintf("%s/%d", cPrefix.Address, cPrefix.Masklength)
rMin, okMin := cPrefix.MasklengthRange[MASK_LENGTH_RANGE_MIN]
rMax, okMax := cPrefix.MasklengthRange[MASK_LENGTH_RANGE_MAX]
if !okMin && !okMax {
if pAddr.Equal(cPrefix.Address) && pMasklen == cPrefix.Masklength {
return true
} else {
return false
}
}
_, ipNet, e := net.ParseCIDR(cp)
if e != nil {
log.WithFields(log.Fields{
"Topic": "Policy",
"Prefix": ipNet,
"Error": e,
}).Error("failed to parse the prefix of condition")
return false
}
if ipNet.Contains(pAddr) && (rMin <= pMasklen && pMasklen <= rMax) {
return true
}
return false
}
//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
}
