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ipam.go
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ipam.go
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// Copyright 2017 Cisco Systems, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// IP address management for host agent
package hostagent
import (
"encoding/json"
"errors"
"fmt"
"net"
cnitypes "github.com/containernetworking/cni/pkg/types"
"github.com/sirupsen/logrus"
"github.com/noironetworks/aci-containers/pkg/ipam"
"github.com/noironetworks/aci-containers/pkg/metadata"
)
func makePodKey(ns, name string) string {
return fmt.Sprintf("%s.%s", ns, name)
}
// builds the used IP info from metadata, at init.
func (agent *HostAgent) buildUsedIPs() {
agent.usedIPs = make(map[string]string)
for _, mds := range agent.epMetadata {
for _, md := range mds {
podKey := makePodKey(md.Id.Namespace, md.Id.Pod)
for _, iface := range md.Ifaces {
for _, ip := range iface.IPs {
agent.usedIPs[ip.Address.IP.String()] = podKey
}
}
}
}
agent.log.Infof("buildIPUsed: %v addresses found", len(agent.usedIPs))
}
// must have index lock
func (agent *HostAgent) rebuildIpam() {
for ip := range agent.usedIPs {
ipAddr := net.ParseIP(ip)
if ipAddr != nil {
if !agent.podIps.RemoveIp(ipAddr) {
agent.log.Errorf("Unable to find used IP %s(%s) in range", ip, agent.usedIPs[ip])
}
} else {
agent.log.Warnf("Couldn't parse %v", ip)
}
}
agent.log.WithFields(logrus.Fields{
"V4": agent.podIps.CombineV4(),
"V6": agent.podIps.CombineV6(),
}).Debug("Updated pod network ranges")
}
func (agent *HostAgent) updateIpamAnnotation(newPodNetAnnotation string) {
if agent.podNetAnnotation == newPodNetAnnotation {
return
}
agent.podNetAnnotation = newPodNetAnnotation
newRanges := &metadata.NetIps{}
err := json.Unmarshal([]byte(agent.podNetAnnotation), newRanges)
if err != nil {
agent.log.Error("Could not parse pod network annotation", err)
return
}
agent.ipamMutex.Lock()
defer agent.ipamMutex.Unlock()
agent.podIps = ipam.NewIpCache()
if newRanges.V4 != nil {
agent.podIps.LoadRanges(newRanges.V4)
}
if newRanges.V6 != nil {
agent.podIps.LoadRanges(newRanges.V6)
}
agent.rebuildIpam()
}
func convertRoutes(routes []route) (cniroutes []*cnitypes.Route) {
for _, r := range routes {
cniroutes = append(cniroutes, &cnitypes.Route{
Dst: net.IPNet{
IP: r.Dst.IP,
Mask: r.Dst.Mask,
},
GW: r.GW,
})
}
return
}
func (agent *HostAgent) getIPMetadata(ip net.IP) (net.IP, net.IPMask) {
nc := agent.config.NetConfig
for _, n := range nc {
subnet := net.IPNet{
IP: n.Subnet.IP,
Mask: n.Subnet.Mask,
}
if subnet.Contains(ip) {
return n.Gateway, n.Subnet.Mask
}
}
return nil, nil
}
func makeIFaceIp(ip, gw net.IP, mask net.IPMask) metadata.ContainerIfaceIP {
return metadata.ContainerIfaceIP{
Address: net.IPNet{
IP: ip,
Mask: mask,
},
Gateway: gw,
}
}
func (agent *HostAgent) allocateIps(iface *metadata.ContainerIfaceMd, podKey string) error {
var result error
var err error
agent.indexMutex.Lock()
defer agent.indexMutex.Unlock()
agent.ipamMutex.Lock()
defer agent.ipamMutex.Unlock()
allocIP := func(isv4 bool, nc *cniNetConfig) bool {
var ip net.IP
ip, err = agent.podIps.AllocateIp(isv4)
if err != nil {
result =
fmt.Errorf("Could not allocate IPv4 address: %w", err)
agent.log.Error(result)
return false
} else {
gateway, mask := agent.getIPMetadata(ip)
if mask == nil {
err := errors.New("Unable to find Mask")
agent.log.Error(fmt.Errorf("Could not allocate address: %w", err))
return false
}
oldKey, found := agent.usedIPs[ip.String()]
if found {
agent.log.Errorf("Duplicate IP %v allocated prev: %s", ip.String(), oldKey)
}
iface.IPs =
append(iface.IPs, makeIFaceIp(ip, gateway, mask))
agent.usedIPs[ip.String()] = podKey
return true
}
}
var v4Allocated, v6Allocated bool
for ix := range agent.config.NetConfig {
if agent.config.NetConfig[ix].Subnet.IP != nil {
if agent.config.NetConfig[ix].Subnet.IP.To4() != nil && !v4Allocated {
v4Allocated = allocIP(true, &agent.config.NetConfig[ix])
} else if agent.config.NetConfig[ix].Subnet.IP.To16() != nil && !v6Allocated {
v6Allocated = allocIP(false, &agent.config.NetConfig[ix])
}
}
}
if result != nil {
agent.deallocateIpsLocked(iface)
} else {
agent.log.WithFields(logrus.Fields{
"IPs": iface.IPs,
}).Debug("Allocated IP addresses")
}
return result
}
func (agent *HostAgent) deallocateIpsLocked(iface *metadata.ContainerIfaceMd) {
for _, ip := range iface.IPs {
if ip.Address.IP == nil {
continue
}
agent.log.Infof("Deallocating IP: %v", ip.Address.IP)
if ip.Address.IP.To4() != nil {
agent.podIps.DeallocateIp(ip.Address.IP)
delete(agent.usedIPs, ip.Address.IP.String())
} else if ip.Address.IP.To16() != nil {
agent.podIps.DeallocateIp(ip.Address.IP)
delete(agent.usedIPs, ip.Address.IP.String())
}
}
iface.IPs = nil
}
func (agent *HostAgent) deallocateMdIps(md *metadata.ContainerMetadata) {
if agent.config.NetConfig == nil {
// using external ipam
return
}
agent.ipamMutex.Lock()
defer agent.ipamMutex.Unlock()
for _, iface := range md.Ifaces {
for _, ip := range iface.IPs {
if ip.Address.IP == nil {
continue
}
agent.log.Infof("Deallocating IP: %v", ip.Address.IP)
if ip.Address.IP.To4() != nil {
agent.podIps.DeallocateIp(ip.Address.IP)
delete(agent.usedIPs, ip.Address.IP.String())
} else if ip.Address.IP.To16() != nil {
agent.podIps.DeallocateIp(ip.Address.IP)
delete(agent.usedIPs, ip.Address.IP.String())
}
agent.log.WithFields(logrus.Fields{
"ip": ip.Address.IP,
}).Debug("Returned IP to pool")
}
}
}