forked from moby/libnetwork
/
peerdb.go
329 lines (265 loc) · 6.57 KB
/
peerdb.go
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package overlay
import (
"fmt"
"net"
"sync"
"syscall"
)
type peerKey struct {
peerIP net.IP
peerMac net.HardwareAddr
}
type peerEntry struct {
eid string
vtep net.IP
peerIPMask net.IPMask
inSandbox bool
isLocal bool
}
type peerMap struct {
mp map[string]peerEntry
sync.Mutex
}
type peerNetworkMap struct {
mp map[string]peerMap
sync.Mutex
}
func (pKey peerKey) String() string {
return fmt.Sprintf("%s %s", pKey.peerIP, pKey.peerMac)
}
func (pKey *peerKey) Scan(state fmt.ScanState, verb rune) error {
ipB, err := state.Token(true, nil)
if err != nil {
return err
}
pKey.peerIP = net.ParseIP(string(ipB))
macB, err := state.Token(true, nil)
if err != nil {
return err
}
pKey.peerMac, err = net.ParseMAC(string(macB))
if err != nil {
return err
}
return nil
}
var peerDbWg sync.WaitGroup
func (d *driver) peerDbWalk(f func(string, *peerKey, *peerEntry) bool) error {
d.peerDb.Lock()
nids := []string{}
for nid := range d.peerDb.mp {
nids = append(nids, nid)
}
d.peerDb.Unlock()
for _, nid := range nids {
d.peerDbNetworkWalk(nid, func(pKey *peerKey, pEntry *peerEntry) bool {
return f(nid, pKey, pEntry)
})
}
return nil
}
func (d *driver) peerDbNetworkWalk(nid string, f func(*peerKey, *peerEntry) bool) error {
d.peerDb.Lock()
pMap, ok := d.peerDb.mp[nid]
if !ok {
d.peerDb.Unlock()
return nil
}
d.peerDb.Unlock()
pMap.Lock()
for pKeyStr, pEntry := range pMap.mp {
var pKey peerKey
if _, err := fmt.Sscan(pKeyStr, &pKey); err != nil {
fmt.Printf("peer key scan failed: %v", err)
}
if f(&pKey, &pEntry) {
pMap.Unlock()
return nil
}
}
pMap.Unlock()
return nil
}
func (d *driver) peerDbSearch(nid string, peerIP net.IP) (net.HardwareAddr, net.IPMask, net.IP, error) {
var (
peerMac net.HardwareAddr
vtep net.IP
peerIPMask net.IPMask
found bool
)
err := d.peerDbNetworkWalk(nid, func(pKey *peerKey, pEntry *peerEntry) bool {
if pKey.peerIP.Equal(peerIP) {
peerMac = pKey.peerMac
peerIPMask = pEntry.peerIPMask
vtep = pEntry.vtep
found = true
return found
}
return found
})
if err != nil {
return nil, nil, nil, fmt.Errorf("peerdb search for peer ip %q failed: %v", peerIP, err)
}
if !found {
return nil, nil, nil, fmt.Errorf("peer ip %q not found in peerdb", peerIP)
}
return peerMac, peerIPMask, vtep, nil
}
func (d *driver) peerDbAdd(nid, eid string, peerIP net.IP, peerIPMask net.IPMask,
peerMac net.HardwareAddr, vtep net.IP, isLocal bool) {
peerDbWg.Wait()
d.peerDb.Lock()
pMap, ok := d.peerDb.mp[nid]
if !ok {
d.peerDb.mp[nid] = peerMap{
mp: make(map[string]peerEntry),
}
pMap = d.peerDb.mp[nid]
}
d.peerDb.Unlock()
pKey := peerKey{
peerIP: peerIP,
peerMac: peerMac,
}
pEntry := peerEntry{
eid: eid,
vtep: vtep,
peerIPMask: peerIPMask,
isLocal: isLocal,
}
pMap.Lock()
pMap.mp[pKey.String()] = pEntry
pMap.Unlock()
}
func (d *driver) peerDbDelete(nid, eid string, peerIP net.IP, peerIPMask net.IPMask,
peerMac net.HardwareAddr, vtep net.IP) {
peerDbWg.Wait()
d.peerDb.Lock()
pMap, ok := d.peerDb.mp[nid]
if !ok {
d.peerDb.Unlock()
return
}
d.peerDb.Unlock()
pKey := peerKey{
peerIP: peerIP,
peerMac: peerMac,
}
pMap.Lock()
delete(pMap.mp, pKey.String())
pMap.Unlock()
}
func (d *driver) peerDbUpdateSandbox(nid string) {
d.peerDb.Lock()
pMap, ok := d.peerDb.mp[nid]
if !ok {
d.peerDb.Unlock()
return
}
d.peerDb.Unlock()
peerDbWg.Add(1)
var peerOps []func()
pMap.Lock()
for pKeyStr, pEntry := range pMap.mp {
var pKey peerKey
if _, err := fmt.Sscan(pKeyStr, &pKey); err != nil {
fmt.Printf("peer key scan failed: %v", err)
}
if pEntry.isLocal {
continue
}
// Go captures variables by reference. The pEntry could be
// pointing to the same memory location for every iteration. Make
// a copy of pEntry before capturing it in the following closure.
entry := pEntry
op := func() {
if err := d.peerAdd(nid, entry.eid, pKey.peerIP, entry.peerIPMask,
pKey.peerMac, entry.vtep,
false); err != nil {
fmt.Printf("peerdbupdate in sandbox failed for ip %s and mac %s: %v",
pKey.peerIP, pKey.peerMac, err)
}
}
peerOps = append(peerOps, op)
}
pMap.Unlock()
for _, op := range peerOps {
op()
}
peerDbWg.Done()
}
func (d *driver) peerAdd(nid, eid string, peerIP net.IP, peerIPMask net.IPMask,
peerMac net.HardwareAddr, vtep net.IP, updateDb bool) error {
if err := validateID(nid, eid); err != nil {
return err
}
if updateDb {
d.peerDbAdd(nid, eid, peerIP, peerIPMask, peerMac, vtep, false)
}
n := d.network(nid)
if n == nil {
return nil
}
sbox := n.sandbox()
if sbox == nil {
return nil
}
IP := &net.IPNet{
IP: peerIP,
Mask: peerIPMask,
}
s := n.getSubnetforIP(IP)
if s == nil {
return fmt.Errorf("couldn't find the subnet %q in network %q\n", IP.String(), n.id)
}
if err := n.obtainVxlanID(s); err != nil {
return fmt.Errorf("couldn't get vxlan id for %q: %v", s.subnetIP.String(), err)
}
if err := n.joinSubnetSandbox(s); err != nil {
return fmt.Errorf("subnet sandbox join failed for %q: %v", s.subnetIP.String(), err)
}
// Add neighbor entry for the peer IP
if err := sbox.AddNeighbor(peerIP, peerMac, sbox.NeighborOptions().LinkName(s.vxlanName)); err != nil {
return fmt.Errorf("could not add neigbor entry into the sandbox: %v", err)
}
// Add fdb entry to the bridge for the peer mac
if err := sbox.AddNeighbor(vtep, peerMac, sbox.NeighborOptions().LinkName(s.vxlanName),
sbox.NeighborOptions().Family(syscall.AF_BRIDGE)); err != nil {
return fmt.Errorf("could not add fdb entry into the sandbox: %v", err)
}
return nil
}
func (d *driver) peerDelete(nid, eid string, peerIP net.IP, peerIPMask net.IPMask,
peerMac net.HardwareAddr, vtep net.IP, updateDb bool) error {
if err := validateID(nid, eid); err != nil {
return err
}
if updateDb {
d.peerDbDelete(nid, eid, peerIP, peerIPMask, peerMac, vtep)
}
n := d.network(nid)
if n == nil {
return nil
}
sbox := n.sandbox()
if sbox == nil {
return nil
}
// Delete fdb entry to the bridge for the peer mac
if err := sbox.DeleteNeighbor(vtep, peerMac); err != nil {
return fmt.Errorf("could not delete fdb entry into the sandbox: %v", err)
}
// Delete neighbor entry for the peer IP
if err := sbox.DeleteNeighbor(peerIP, peerMac); err != nil {
return fmt.Errorf("could not delete neigbor entry into the sandbox: %v", err)
}
return nil
}
func (d *driver) pushLocalDb() {
d.peerDbWalk(func(nid string, pKey *peerKey, pEntry *peerEntry) bool {
if pEntry.isLocal {
d.pushLocalEndpointEvent("join", nid, pEntry.eid)
}
return false
})
}