/**
* Constructs a BGP intent and put it into the intentList.
*
* <p>The purpose of this method is too simplify the setUpBgpIntents() method, and to make the
* setUpBgpIntents() easy to read.
*
* @param srcVlanId ingress VlanId
* @param dstVlanId egress VlanId
* @param srcPrefix source IP prefix to match
* @param dstPrefix destination IP prefix to match
* @param srcTcpPort source TCP port to match
* @param dstTcpPort destination TCP port to match
* @param srcConnectPoint source connect point for PointToPointIntent
* @param dstConnectPoint destination connect point for PointToPointIntent
*/
private void bgpPathintentConstructor(
VlanId srcVlanId,
VlanId dstVlanId,
String srcPrefix,
String dstPrefix,
Short srcTcpPort,
Short dstTcpPort,
ConnectPoint srcConnectPoint,
ConnectPoint dstConnectPoint) {
TrafficSelector.Builder builder =
DefaultTrafficSelector.builder()
.matchEthType(Ethernet.TYPE_IPV4)
.matchIPProtocol(IPv4.PROTOCOL_TCP)
.matchIPSrc(IpPrefix.valueOf(srcPrefix))
.matchIPDst(IpPrefix.valueOf(dstPrefix));
if (!srcVlanId.equals(VlanId.NONE)) {
builder.matchVlanId(srcVlanId);
}
TrafficTreatment.Builder treatment = DefaultTrafficTreatment.builder();
if (!dstVlanId.equals(VlanId.NONE)) {
treatment.setVlanId(dstVlanId);
}
if (srcTcpPort != null) {
builder.matchTcpSrc(TpPort.tpPort(srcTcpPort));
}
if (dstTcpPort != null) {
builder.matchTcpDst(TpPort.tpPort(dstTcpPort));
}
Key key =
Key.of(
srcPrefix.split("/")[0]
+ "-"
+ dstPrefix.split("/")[0]
+ "-"
+ ((srcTcpPort == null) ? "dst" : "src"),
APPID);
PointToPointIntent intent =
PointToPointIntent.builder()
.appId(APPID)
.key(key)
.selector(builder.build())
.treatment(treatment.build())
.ingressPoint(srcConnectPoint)
.egressPoint(dstConnectPoint)
.build();
intentList.add(intent);
}
/**
* Generates a route intent for a prefix, the next hop IP address, and the next hop MAC address.
*
* <p>This method will find the egress interface for the intent. Intent will match dst IP prefix
* and rewrite dst MAC address at all other border switches, then forward packets according to dst
* MAC address.
*
* @param prefix IP prefix of the route to add
* @param nextHopIpAddress IP address of the next hop
* @param nextHopMacAddress MAC address of the next hop
* @return the generated intent, or null if no intent should be submitted
*/
private MultiPointToSinglePointIntent generateRouteIntent(
IpPrefix prefix, IpAddress nextHopIpAddress, MacAddress nextHopMacAddress) {
// Find the attachment point (egress interface) of the next hop
Interface egressInterface = interfaceService.getMatchingInterface(nextHopIpAddress);
if (egressInterface == null) {
log.warn("No outgoing interface found for {}", nextHopIpAddress);
return null;
}
// Generate the intent itself
Set<ConnectPoint> ingressPorts = new HashSet<>();
ConnectPoint egressPort = egressInterface.connectPoint();
log.debug("Generating intent for prefix {}, next hop mac {}", prefix, nextHopMacAddress);
for (Interface intf : interfaceService.getInterfaces()) {
// TODO this should be only peering interfaces
if (!intf.connectPoint().equals(egressInterface.connectPoint())) {
ConnectPoint srcPort = intf.connectPoint();
ingressPorts.add(srcPort);
}
}
// Match the destination IP prefix at the first hop
TrafficSelector.Builder selector = DefaultTrafficSelector.builder();
if (prefix.isIp4()) {
selector.matchEthType(Ethernet.TYPE_IPV4);
// if it is default route, then we do not need match destination
// IP address
if (prefix.prefixLength() != 0) {
selector.matchIPDst(prefix);
}
} else {
selector.matchEthType(Ethernet.TYPE_IPV6);
// if it is default route, then we do not need match destination
// IP address
if (prefix.prefixLength() != 0) {
selector.matchIPv6Dst(prefix);
}
}
// Rewrite the destination MAC address
TrafficTreatment.Builder treatment =
DefaultTrafficTreatment.builder().setEthDst(nextHopMacAddress);
if (!egressInterface.vlan().equals(VlanId.NONE)) {
treatment.setVlanId(egressInterface.vlan());
// If we set VLAN ID, we have to make sure a VLAN tag exists.
// TODO support no VLAN -> VLAN routing
selector.matchVlanId(VlanId.ANY);
}
int priority = prefix.prefixLength() * PRIORITY_MULTIPLIER + PRIORITY_OFFSET;
Key key = Key.of(prefix.toString(), appId);
return MultiPointToSinglePointIntent.builder()
.appId(appId)
.key(key)
.selector(selector.build())
.treatment(treatment.build())
.ingressPoints(ingressPorts)
.egressPoint(egressPort)
.priority(priority)
.constraints(CONSTRAINTS)
.build();
}
