Golang Path.GetRouteFamily方法代码示例

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 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
}

func (peer *Peer) filterpath(path *table.Path) *table.Path {
	// special handling for RTC nlri
	// see comments in (*Destination).Calculate()
	if path != nil && path.GetRouteFamily() == bgp.RF_RTC_UC && !path.IsWithdraw {
		// if we already sent the same nlri, ignore this
		if peer.adjRibOut.Exists(path) {
			return nil
		}
		dst := peer.localRib.GetDestination(path)
		path = nil
		// we send a path even if it is not a best path
		for _, p := range dst.GetKnownPathList(peer.TableID()) {
			// just take care not to send back it
			if peer.ID() != p.GetSource().Address.String() {
				path = p
				break
			}
		}
	}
	if filterpath(peer, path) == nil {
		return nil
	}
	if !peer.isRouteServerClient() {
		path = path.Clone(path.IsWithdraw)
		path.UpdatePathAttrs(peer.fsm.gConf, peer.fsm.pConf)
	}
	options := &table.PolicyOptions{
		Info: peer.fsm.peerInfo,
	}
	path = peer.policy.ApplyPolicy(peer.TableID(), table.POLICY_DIRECTION_EXPORT, path, options)

	// remove local-pref attribute
	// we should do this after applying export policy since policy may
	// set local-preference
	if path != nil && peer.fsm.pConf.Config.PeerType == config.PEER_TYPE_EXTERNAL {
		path.RemoveLocalPref()
	}
	return path
}

func (peer *Peer) filterpath(path, old *table.Path) *table.Path {
	// special handling for RTC nlri
	// see comments in (*Destination).Calculate()
	if path != nil && path.GetRouteFamily() == bgp.RF_RTC_UC && !path.IsWithdraw {

		// If we already sent the same nlri, send unnecessary
		// update. Fix this after the API change between table
		// and server packages.

		dst := peer.localRib.GetDestination(path)
		path = nil
		// we send a path even if it is not a best path
		for _, p := range dst.GetKnownPathList(peer.TableID()) {
			// just take care not to send back it
			if peer.ID() != p.GetSource().Address.String() {
				path = p
				break
			}
		}
	}

	// only allow vpnv4 and vpnv6 paths to be advertised to VRFed neighbors.
	// also check we can import this path using table.CanImportToVrf()
	// if we can, make it local path by calling (*Path).ToLocal()
	if path != nil && peer.fsm.pConf.Config.Vrf != "" {
		if f := path.GetRouteFamily(); f != bgp.RF_IPv4_VPN && f != bgp.RF_IPv6_VPN {
			return nil
		}
		vrf := peer.localRib.Vrfs[peer.fsm.pConf.Config.Vrf]
		if table.CanImportToVrf(vrf, path) {
			path = path.ToLocal()
		} else {
			return nil
		}
	}

	if path = filterpath(peer, path, old); path == nil {
		return nil
	}

	path = path.Clone(path.IsWithdraw)
	path.UpdatePathAttrs(peer.fsm.gConf, peer.fsm.pConf)

	options := &table.PolicyOptions{
		Info: peer.fsm.peerInfo,
	}
	path = peer.policy.ApplyPolicy(peer.TableID(), table.POLICY_DIRECTION_EXPORT, path, options)

	// draft-uttaro-idr-bgp-persistence-02
	// 4.3.  Processing LLGR_STALE Routes
	//
	// The route SHOULD NOT be advertised to any neighbor from which the
	// Long-lived Graceful Restart Capability has not been received.  The
	// exception is described in the Optional Partial Deployment
	// Procedure section (Section 4.7).  Note that this requirement
	// implies that such routes should be withdrawn from any such neighbor.
	if path != nil && !path.IsWithdraw && !peer.isLLGREnabledFamily(path.GetRouteFamily()) && path.IsLLGRStale() {
		// we send unnecessary withdrawn even if we didn't
		// sent the route.
		path = path.Clone(true)
	}

	// remove local-pref attribute
	// we should do this after applying export policy since policy may
	// set local-preference
	if path != nil && !peer.isIBGPPeer() && !peer.isRouteServerClient() {
		path.RemoveLocalPref()
	}
	return path
}