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conntrack.go
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conntrack.go
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// Copyright 2016-2017 Authors of Cilium
//
// 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.
package endpointmanager
import (
"fmt"
"net"
"strconv"
"time"
"github.com/cilium/cilium/pkg/bpf"
"github.com/cilium/cilium/pkg/endpoint"
"github.com/cilium/cilium/pkg/maps/ctmap"
log "github.com/Sirupsen/logrus"
)
const (
// GcInterval is the garbage collection interval.
GcInterval int = 10
)
// RunGC run CT's garbage collector for the given endpoint. `isLocal` refers if
// the CT map is set to local. If `isIPv6` is set specifies that is the IPv6
// map. `filter` represents the filter type to be used while looping all CT
// entries.
func RunGC(e *endpoint.Endpoint, isLocal, isIPv6 bool, filter *ctmap.GCFilter) {
var file string
var mapType string
// TODO: We need to optimize this a bit in future, so we traverse
// the global table less often.
// Use local or global conntrack maps depending on configuration settings.
if isLocal {
if isIPv6 {
mapType = ctmap.MapName6
} else {
mapType = ctmap.MapName4
}
file = bpf.MapPath(mapType + strconv.Itoa(int(e.ID)))
} else {
if isIPv6 {
mapType = ctmap.MapName6Global
} else {
mapType = ctmap.MapName4Global
}
file = bpf.MapPath(mapType)
}
m, err := bpf.OpenMap(file)
if err != nil {
log.Warningf("Unable to open map %s: %s", file, err)
e.LogStatus(endpoint.BPF, endpoint.Warning, fmt.Sprintf("Unable to open CT map %s: %s", file, err))
return
}
defer m.Close()
// If LRUHashtable, no need to garbage collect as LRUHashtable cleans itself up.
if m.MapInfo.MapType == bpf.MapTypeLRUHash {
return
}
deleted := ctmap.GC(m, mapType, filter)
if deleted > 0 {
log.Debugf("Deleted %d entries from map %s", deleted, file)
}
}
// EnableConntrackGC enables the connection tracking garbage collection.
func EnableConntrackGC(ipv4, ipv6 bool) {
go func() {
seenGlobal := false
sleepTime := time.Duration(GcInterval) * time.Second
for {
Mutex.RLock()
for k := range Endpoints {
e := Endpoints[k]
e.Mutex.RLock()
if e.Consumable == nil {
e.Mutex.RUnlock()
continue
}
// Only process global CT once per round.
// We don't really care about which EP
// triggers the traversal as long as we do
// traverse it eventually. Update/delete
// combo only serialized done from here,
// so no extra mutex for global CT needed
// right now. We still need to traverse
// other EPs since some may not be part
// of the global CT, but have a local one.
isLocal := e.Opts.IsEnabled(endpoint.OptionConntrackLocal)
if isLocal == false {
if seenGlobal == true {
e.Mutex.RUnlock()
continue
}
seenGlobal = true
}
e.Mutex.RUnlock()
// We can unlock the endpoint mutex sense
// in runGC it will be locked as needed.
if ipv6 {
RunGC(e, isLocal, true, ctmap.NewGCFilterBy(ctmap.GCFilterByTime))
}
if ipv4 {
RunGC(e, isLocal, false, ctmap.NewGCFilterBy(ctmap.GCFilterByTime))
}
}
Mutex.RUnlock()
time.Sleep(sleepTime)
seenGlobal = false
}
}()
}
// RmCTEntriesOf cleans the connection tracking table of the given endpoint `e`
// by removing the CT's entries that have the src_sec_id equal to any of keys
// in the ids' map.
func RmCTEntriesOf(ipv4Enabled bool, e *endpoint.Endpoint, ids map[uint32]bool) {
var eIPv4, eIPv6 net.IP
e.Mutex.RLock()
isLocal := e.Opts.IsEnabled(endpoint.OptionConntrackLocal)
eIPv6 = e.IPv6.IP()
if ipv4Enabled {
eIPv4 = e.IPv4.IP()
}
// We can unlock the endpoint mutex since
// in runGC it will be locked as needed.
e.Mutex.RUnlock()
gcFilter := ctmap.NewGCFilterBy(ctmap.GCFilterByID)
gcFilter.IDsToRm = ids
gcFilter.IP = eIPv6
RunGC(e, isLocal, true, gcFilter)
if ipv4Enabled {
gcFilter.IP = eIPv4
RunGC(e, isLocal, false, gcFilter)
}
}