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https://github.com/moby/moby.git
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Initial Checkin GetServices and GetDestinations
Signed-off-by: dhilipkumars <dhilip.kumar.s@huawei.com>
This commit is contained in:
dhilipkumars
parent
1738f963ab
commit
000775b918
3 changed files with 349 additions and 8 deletions
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@ -85,6 +85,23 @@ const (
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ipvsDestAttrInactiveConnections
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ipvsDestAttrPersistentConnections
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ipvsDestAttrStats
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ipvsDestAttrAddressFamily
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)
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// IPVS Svc Statistics constancs
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const (
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ipvsSvcStatsUnspec int = iota
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ipvsSvcStatsConns
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ipvsSvcStatsPktsIn
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ipvsSvcStatsPktsOut
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ipvsSvcStatsBytesIn
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ipvsSvcStatsBytesOut
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ipvsSvcStatsCPS
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ipvsSvcStatsPPSIn
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ipvsSvcStatsPPSOut
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ipvsSvcStatsBPSIn
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ipvsSvcStatsBPSOut
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)
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// Destination forwarding methods
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@ -25,6 +25,20 @@ type Service struct {
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Netmask uint32
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AddressFamily uint16
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PEName string
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Stats SvcStats
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}
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type SvcStats struct {
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Connections uint32
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PacketsIn uint32
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PacketsOut uint32
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BytesIn uint64
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BytesOut uint64
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CPS uint32
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BPSOut uint32
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PPSIn uint32
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PPSOut uint32
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BPSIn uint32
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}
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// Destination defines an IPVS destination (real server) in its
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@ -117,3 +131,45 @@ func (i *Handle) UpdateDestination(s *Service, d *Destination) error {
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func (i *Handle) DelDestination(s *Service, d *Destination) error {
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return i.doCmd(s, d, ipvsCmdDelDest)
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}
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// GetServices returns an array of services configured at the kernel
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func (i *Handle) GetServices() ([]*Service, error) {
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var res []*Service
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//var emptySrv Service
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//var emptyDest Destination
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msgs, err := i.doCmdwithResponse(nil, nil, ipvsCmdGetService)
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if err != nil {
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return nil, err
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}
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for _, msg := range msgs {
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srv, err := i.ParseService(msg)
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if err != nil {
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return res, err
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}
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res = append(res, srv)
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}
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return res, nil
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}
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// GetDestinations returns an array of Destinations configured for this
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func (i *Handle) GetDestinations(s *Service) ([]*Destination, error) {
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var res []*Destination
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msgs, err := i.doCmdwithResponse(s, nil, ipvsCmdGetDest)
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if err != nil {
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return nil, err
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}
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for _, msg := range msgs {
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dest, err := i.ParseDestination(msg)
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if err != nil {
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return res, err
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}
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res = append(res, dest)
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}
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return res, nil
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}
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@ -19,6 +19,8 @@ import (
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"github.com/vishvananda/netns"
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)
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//For Quick Reference IPVS related netlink message is described below.
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var (
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native = nl.NativeEndian()
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ipvsFamily int
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@ -72,6 +74,7 @@ func setup() {
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func fillService(s *Service) nl.NetlinkRequestData {
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cmdAttr := nl.NewRtAttr(ipvsCmdAttrService, nil)
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nl.NewRtAttrChild(cmdAttr, ipvsSvcAttrAddressFamily, nl.Uint16Attr(s.AddressFamily))
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if s.FWMark != 0 {
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nl.NewRtAttrChild(cmdAttr, ipvsSvcAttrFWMark, nl.Uint32Attr(s.FWMark))
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@ -89,12 +92,12 @@ func fillService(s *Service) nl.NetlinkRequestData {
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if s.PEName != "" {
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nl.NewRtAttrChild(cmdAttr, ipvsSvcAttrPEName, nl.ZeroTerminated(s.PEName))
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}
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f := &ipvsFlags{
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flags: s.Flags,
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mask: 0xFFFFFFFF,
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}
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nl.NewRtAttrChild(cmdAttr, ipvsSvcAttrFlags, f.Serialize())
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nl.NewRtAttrChild(cmdAttr, ipvsSvcAttrTimeout, nl.Uint32Attr(s.Timeout))
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nl.NewRtAttrChild(cmdAttr, ipvsSvcAttrNetmask, nl.Uint32Attr(s.Netmask))
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return cmdAttr
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@ -117,20 +120,38 @@ func fillDestinaton(d *Destination) nl.NetlinkRequestData {
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return cmdAttr
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}
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func (i *Handle) doCmd(s *Service, d *Destination, cmd uint8) error {
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func (i *Handle) doCmdwithResponse(s *Service, d *Destination, cmd uint8) ([][]byte, error) {
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req := newIPVSRequest(cmd)
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req.Seq = atomic.AddUint32(&i.seq, 1)
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req.AddData(fillService(s))
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if d != nil {
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if s == nil {
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req.Flags |= syscall.NLM_F_DUMP //Flag to dump all messages
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req.AddData(nl.NewRtAttr(ipvsCmdAttrService, nil)) //Add a dummy attribute
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} else {
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req.AddData(fillService(s))
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}
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if d == nil {
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if cmd == ipvsCmdGetDest {
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req.Flags |= syscall.NLM_F_DUMP
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}
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} else {
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req.AddData(fillDestinaton(d))
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}
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if _, err := execute(i.sock, req, 0); err != nil {
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return err
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res, err := execute(i.sock, req, 0)
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if err != nil {
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return [][]byte{}, err
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}
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return nil
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return res, nil
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}
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func (i *Handle) doCmd(s *Service, d *Destination, cmd uint8) error {
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_, err := i.doCmdwithResponse(s, d, cmd)
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return err
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}
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func getIPVSFamily() (int, error) {
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@ -171,7 +192,6 @@ func rawIPData(ip net.IP) []byte {
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if family == nl.FAMILY_V4 {
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return ip.To4()
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}
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return ip
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}
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@ -208,6 +228,7 @@ done:
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return nil, err
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}
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for _, m := range msgs {
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if m.Header.Seq != req.Seq {
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continue
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}
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@ -217,6 +238,7 @@ done:
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if m.Header.Type == syscall.NLMSG_DONE {
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break done
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}
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if m.Header.Type == syscall.NLMSG_ERROR {
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error := int32(native.Uint32(m.Data[0:4]))
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if error == 0 {
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@ -235,3 +257,249 @@ done:
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}
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return res, nil
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}
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func parseIP(ip []byte, family uint16) (net.IP, error) {
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var resIP net.IP
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switch family {
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case syscall.AF_INET:
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resIP = (net.IP)(ip[:4])
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case syscall.AF_INET6:
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resIP = (net.IP)(ip[:16])
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default:
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return resIP, fmt.Errorf("parseIP Error ip=%v", ip)
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}
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return resIP, nil
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}
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func parseStats(msg []byte) (SvcStats, error) {
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var s SvcStats
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attrs, err := nl.ParseRouteAttr(msg)
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if err != nil {
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return s, err
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}
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for _, attr := range attrs {
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attrType := int(attr.Attr.Type)
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switch attrType {
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case ipvsSvcStatsConns:
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s.Connections = native.Uint32(attr.Value)
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case ipvsSvcStatsPktsIn:
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s.PacketsIn = native.Uint32(attr.Value)
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case ipvsSvcStatsPktsOut:
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s.PacketsOut = native.Uint32(attr.Value)
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case ipvsSvcStatsBytesIn:
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s.BytesIn = native.Uint64(attr.Value)
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case ipvsSvcStatsBytesOut:
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s.BytesOut = native.Uint64(attr.Value)
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case ipvsSvcStatsCPS:
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s.CPS = native.Uint32(attr.Value)
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case ipvsSvcStatsPPSIn:
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s.PPSIn = native.Uint32(attr.Value)
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case ipvsSvcStatsPPSOut:
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s.PPSOut = native.Uint32(attr.Value)
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case ipvsSvcStatsBPSIn:
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s.BPSIn = native.Uint32(attr.Value)
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case ipvsSvcStatsBPSOut:
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s.BPSOut = native.Uint32(attr.Value)
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}
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}
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return s, nil
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}
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//assembleService assembles a services back from a hain of netlink attributes
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func assembleService(attrs []syscall.NetlinkRouteAttr) (*Service, error) {
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var svc Service
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for _, attr := range attrs {
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attrType := int(attr.Attr.Type)
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switch attrType {
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case ipvsSvcAttrAddressFamily:
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svc.AddressFamily = native.Uint16(attr.Value)
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case ipvsSvcAttrProtocol:
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svc.Protocol = native.Uint16(attr.Value)
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case ipvsSvcAttrAddress:
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ip, err := parseIP(attr.Value, svc.AddressFamily)
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if err != nil {
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return nil, err
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}
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svc.Address = ip
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case ipvsSvcAttrPort:
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svc.Port = binary.BigEndian.Uint16(attr.Value)
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case ipvsSvcAttrFWMark:
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svc.FWMark = native.Uint32(attr.Value)
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case ipvsSvcAttrSchedName:
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svc.SchedName = string(attr.Value)
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case ipvsSvcAttrFlags:
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svc.Flags = native.Uint32(attr.Value)
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case ipvsSvcAttrTimeout:
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svc.Timeout = native.Uint32(attr.Value)
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case ipvsSvcAttrNetmask:
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svc.Timeout = native.Uint32(attr.Value)
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case ipvsSvcAttrStats:
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stats, err := parseStats(attr.Value)
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if err != nil {
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return nil, err
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}
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svc.Stats = stats
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}
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}
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return &svc, nil
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}
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func assembleDestination(attrs []syscall.NetlinkRouteAttr) (*Destination, error) {
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var d Destination
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for _, attr := range attrs {
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attrType := int(attr.Attr.Type)
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switch attrType {
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case ipvsDestAttrAddress:
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ip, err := parseIP(attr.Value, syscall.AF_INET)
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if err != nil {
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return nil, err
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}
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d.Address = ip
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case ipvsDestAttrPort:
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d.Port = binary.BigEndian.Uint16(attr.Value)
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case ipvsDestAttrForwardingMethod:
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case ipvsDestAttrWeight:
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d.Weight = int(native.Uint16(attr.Value))
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case ipvsDestAttrUpperThreshold:
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d.UpperThreshold = native.Uint32(attr.Value)
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case ipvsDestAttrLowerThreshold:
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d.LowerThreshold = native.Uint32(attr.Value)
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case ipvsDestAttrAddressFamily:
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d.AddressFamily = native.Uint16(attr.Value)
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}
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}
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return &d, nil
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}
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//ParseService given a ipvs netlink response this function will respond with a valid service entry, an error otherwise
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func (i *Handle) ParseService(msg []byte) (*Service, error) {
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var svc *Service
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//Remove General header for this message and parse the NetLink message
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hdr := deserializeGenlMsg(msg)
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NetLinkAttrs, err := nl.ParseRouteAttr(msg[hdr.Len():])
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if err != nil {
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return nil, err
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}
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if len(NetLinkAttrs) == 0 {
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return nil, fmt.Errorf("Error No valid net link message found while Parsing service record")
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}
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//Now parse the smaller messages and get a list of attributes to construct a valid service
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ipvsAttrs, err := nl.ParseRouteAttr(NetLinkAttrs[0].Value)
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if err != nil {
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return nil, err
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}
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//Assemble netlink attributes and create a service record
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svc, err = assembleService(ipvsAttrs)
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if err != nil {
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return nil, err
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}
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return svc, nil
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}
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//ParseDestination given a ipvs netlink response this function will respond with a valid destination entry, an error otherwise
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func (i *Handle) ParseDestination(msg []byte) (*Destination, error) {
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var dst *Destination
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//Remove General header for this message
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hdr := deserializeGenlMsg(msg)
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NetLinkAttrs, err := nl.ParseRouteAttr(msg[hdr.Len():])
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if err != nil {
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return nil, err
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}
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if len(NetLinkAttrs) == 0 {
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return nil, fmt.Errorf("Error No valid net link message found while Parsing service record")
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}
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//Convert rest of the messages to Attribute Array
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ipvsAttrs, err := nl.ParseRouteAttr(NetLinkAttrs[0].Value)
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if err != nil {
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return nil, err
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}
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//Assemble netlink attributes and create a Destination record
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dst, err = assembleDestination(ipvsAttrs)
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if err != nil {
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return nil, err
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}
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return dst, nil
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}
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//IPVS related netlink message format explained
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//and unpacks these messages
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/* EACH NETLINK REQUEST / RESPONSE WILL LOOK LIKE THIS when returned from
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|-----------------------------------|
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0 1 2 3
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|--------|--------|--------|--------|
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| CMD ID | VER | RESERVED |
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|-----------------------------------|
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| MSG LEN | MSG TYPE |
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|-----------------------------------|
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| []byte IPVS MSG PADDED BY 4 BYTES |
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|-----------------------------------|
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A response from the IPVS module is usually
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|-----------------------------------|
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0 1 2 3
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|--------|--------|--------|--------|
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| ATTR LEN | ATTR TYPE |
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|-----------------------------------|
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| []byte IPVS ATTRIBUTE BY 4 BYTES |
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|-----------------------------------|
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NEXT ATTRIBUTE
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|-----------------------------------|
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| ATTR LEN | ATTR TYPE |
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|-----------------------------------|
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| []byte IPVS ATTRIBUTE BY 4 BYTES |
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|-----------------------------------|
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NEXT ATTRIBUTE
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|-----------------------------------|
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| ATTR LEN | ATTR TYPE |
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|-----------------------------------|
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| []byte IPVS ATTRIBUTE BY 4 BYTES |
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|-----------------------------------|
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*/
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