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subnets.go
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subnets.go
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package osdn
import (
"fmt"
"net"
"time"
log "github.com/golang/glog"
"github.com/openshift/openshift-sdn/pkg/netutils"
"github.com/openshift/openshift-sdn/plugins/osdn/api"
)
func (oc *OvsController) SubnetStartMaster(clusterNetwork *net.IPNet, hostSubnetLength uint) error {
subrange := make([]string, 0)
subnets, _, err := oc.Registry.GetSubnets()
if err != nil {
log.Errorf("Error in initializing/fetching subnets: %v", err)
return err
}
for _, sub := range subnets {
subrange = append(subrange, sub.SubnetCIDR)
if err := oc.validateNode(sub.NodeIP); err != nil {
// Don't error out; just warn so the error can be corrected with 'oc'
log.Errorf("Failed to validate HostSubnet %s: %v", err)
}
}
oc.subnetAllocator, err = netutils.NewSubnetAllocator(clusterNetwork.String(), hostSubnetLength, subrange)
if err != nil {
return err
}
getNodes := func(registry *Registry) (interface{}, string, error) {
return registry.GetNodes()
}
result, err := oc.watchAndGetResource("Node", watchNodes, getNodes)
if err != nil {
return err
}
// Make sure each node has a Subnet allocated
nodes := result.([]api.Node)
for _, node := range nodes {
err = oc.validateNode(node.IP)
if err != nil {
// Don't error out; just warn so the error can be corrected by admin
log.Errorf("Failed to validate Node %s: %v", node.Name, err)
continue
}
_, err := oc.Registry.GetSubnet(node.Name)
if err == nil {
// subnet already exists, continue
continue
}
err = oc.addNode(node.Name, node.IP)
if err != nil {
return err
}
}
return nil
}
func (oc *OvsController) addNode(nodeName string, nodeIP string) error {
sn, err := oc.subnetAllocator.GetNetwork()
if err != nil {
log.Errorf("Error creating network for node %s.", nodeName)
return err
}
if nodeIP == "" || nodeIP == "127.0.0.1" {
return fmt.Errorf("Invalid node IP")
}
subnet := &api.Subnet{
NodeIP: nodeIP,
SubnetCIDR: sn.String(),
}
err = oc.Registry.CreateSubnet(nodeName, subnet)
if err != nil {
log.Errorf("Error writing subnet to etcd for node %s: %v", nodeName, sn)
return err
}
return nil
}
func (oc *OvsController) deleteNode(nodeName string) error {
sub, err := oc.Registry.GetSubnet(nodeName)
if err != nil {
log.Errorf("Error fetching subnet for node %s for delete operation.", nodeName)
return err
}
_, ipnet, err := net.ParseCIDR(sub.SubnetCIDR)
if err != nil {
log.Errorf("Error parsing subnet for node %s for deletion: %s", nodeName, sub.SubnetCIDR)
return err
}
oc.subnetAllocator.ReleaseNetwork(ipnet)
return oc.Registry.DeleteSubnet(nodeName)
}
func (oc *OvsController) SubnetStartNode(mtu uint) (bool, error) {
err := oc.initSelfSubnet()
if err != nil {
return false, err
}
// Assume we are working with IPv4
clusterNetwork, _, servicesNetwork, err := oc.Registry.GetNetworkInfo()
if err != nil {
log.Errorf("Failed to obtain ClusterNetwork: %v", err)
return false, err
}
networkChanged, err := oc.flowController.Setup(oc.localSubnet.SubnetCIDR, clusterNetwork.String(), servicesNetwork.String(), mtu)
if err != nil {
return false, err
}
getSubnets := func(registry *Registry) (interface{}, string, error) {
return registry.GetSubnets()
}
result, err := oc.watchAndGetResource("HostSubnet", watchSubnets, getSubnets)
if err != nil {
return false, err
}
subnets := result.([]api.Subnet)
for _, s := range subnets {
oc.flowController.AddOFRules(s.NodeIP, s.SubnetCIDR, oc.localIP)
}
return networkChanged, nil
}
func (oc *OvsController) initSelfSubnet() error {
// timeout: 30 secs
retries := 60
retryInterval := 500 * time.Millisecond
var err error
var subnet *api.Subnet
// Try every retryInterval and bail-out if it exceeds max retries
for i := 0; i < retries; i++ {
// Get subnet for current node
subnet, err = oc.Registry.GetSubnet(oc.HostName)
if err == nil {
break
}
log.Warningf("Could not find an allocated subnet for node: %s, Waiting...", oc.HostName)
time.Sleep(retryInterval)
}
if err != nil {
return fmt.Errorf("Failed to get subnet for this host: %s, error: %v", oc.HostName, err)
}
if err := oc.validateNode(subnet.NodeIP); err != nil {
return fmt.Errorf("Failed to validate own HostSubnet: %v", err)
}
oc.localSubnet = subnet
return nil
}
// Only run on the master
func watchNodes(oc *OvsController, ready chan<- bool, start <-chan string) {
stop := make(chan bool)
nodeEvent := make(chan *api.NodeEvent)
go oc.Registry.WatchNodes(nodeEvent, ready, start, stop)
for {
select {
case ev := <-nodeEvent:
switch ev.Type {
case api.Added:
nodeErr := oc.validateNode(ev.Node.IP)
sub, err := oc.Registry.GetSubnet(ev.Node.Name)
if err != nil {
if nodeErr == nil {
// subnet does not exist already
oc.addNode(ev.Node.Name, ev.Node.IP)
} else {
log.Errorf("Ignoring invalid node %s/%s: %v", ev.Node.Name, ev.Node.IP, nodeErr)
}
} else {
// Current node IP is obtained from event, ev.NodeIP to
// avoid cached/stale IP lookup by net.LookupIP()
if sub.NodeIP != ev.Node.IP {
err = oc.Registry.DeleteSubnet(ev.Node.Name)
if err != nil {
log.Errorf("Error deleting subnet for node %s, old ip %s", ev.Node.Name, sub.NodeIP)
continue
}
if nodeErr == nil {
sub.NodeIP = ev.Node.IP
err = oc.Registry.CreateSubnet(ev.Node.Name, sub)
if err != nil {
log.Errorf("Error creating subnet for node %s, ip %s", ev.Node.Name, sub.NodeIP)
continue
}
} else {
log.Errorf("Ignoring creating invalid node %s/%s: %v", ev.Node.Name, ev.Node.IP, nodeErr)
}
}
}
case api.Deleted:
oc.deleteNode(ev.Node.Name)
}
case <-oc.sig:
log.Error("Signal received. Stopping watching of nodes.")
stop <- true
return
}
}
}
// Only run on the nodes
func watchSubnets(oc *OvsController, ready chan<- bool, start <-chan string) {
stop := make(chan bool)
clusterEvent := make(chan *api.SubnetEvent)
go oc.Registry.WatchSubnets(clusterEvent, ready, start, stop)
for {
select {
case ev := <-clusterEvent:
switch ev.Type {
case api.Added:
if err := oc.validateNode(ev.Subnet.NodeIP); err != nil {
log.Errorf("Ignoring invalid subnet for node %s: %v", ev.Subnet.NodeIP, err)
continue
}
// add openflow rules
oc.flowController.AddOFRules(ev.Subnet.NodeIP, ev.Subnet.SubnetCIDR, oc.localIP)
case api.Deleted:
// delete openflow rules meant for the node
oc.flowController.DelOFRules(ev.Subnet.NodeIP, oc.localIP)
}
case <-oc.sig:
stop <- true
return
}
}
}
func (oc *OvsController) validateNode(nodeIP string) error {
clusterNet, err := oc.Registry.GetClusterNetwork()
if err != nil {
return fmt.Errorf("Failed to get Cluster Network address: %v", err)
}
// Ensure each node's NodeIP is not contained by the cluster network,
// which could cause a routing loop. (rhbz#1295486)
ipaddr := net.ParseIP(nodeIP)
if ipaddr == nil {
return fmt.Errorf("Failed to parse node IP %s", nodeIP)
}
if clusterNet.Contains(ipaddr) {
return fmt.Errorf("Node IP %s conflicts with cluster network %s", nodeIP, clusterNet.String())
}
return nil
}