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Add zone filter to conntrack

This commit is contained in:
Hongliang Liu 2024-04-07 00:00:53 +08:00 committed by Alessandro Boch
parent 19057e85f5
commit 99ce943af8
3 changed files with 66 additions and 23 deletions
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35
conntrack_linux.go
View File

@ -146,6 +146,7 @@ type ConntrackFlow struct {
Forward ipTuple
Reverse ipTuple
Mark uint32
Zone uint16
TimeStart uint64
TimeStop uint64
TimeOut uint32
@ -154,7 +155,7 @@ type ConntrackFlow struct {
func (s *ConntrackFlow) String() string {
// conntrack cmd output:
// udp 17 src=127.0.0.1 dst=127.0.0.1 sport=4001 dport=1234 packets=5 bytes=532 [UNREPLIED] src=127.0.0.1 dst=127.0.0.1 sport=1234 dport=4001 packets=10 bytes=1078 mark=0 labels=0x00000000050012ac4202010000000000
// udp 17 src=127.0.0.1 dst=127.0.0.1 sport=4001 dport=1234 packets=5 bytes=532 [UNREPLIED] src=127.0.0.1 dst=127.0.0.1 sport=1234 dport=4001 packets=10 bytes=1078 mark=0 labels=0x00000000050012ac4202010000000000 zone=100
// start=2019-07-26 01:26:21.557800506 +0000 UTC stop=1970-01-01 00:00:00 +0000 UTC timeout=30(sec)
start := time.Unix(0, int64(s.TimeStart))
stop := time.Unix(0, int64(s.TimeStop))
@ -167,6 +168,9 @@ func (s *ConntrackFlow) String() string {
if len(s.Labels) > 0 {
res += fmt.Sprintf("labels=0x%x ", s.Labels)
}
if s.Zone != 0 {
res += fmt.Sprintf("zone=%d ", s.Zone)
}
res += fmt.Sprintf("start=%v stop=%v timeout=%d(sec)", start, stop, timeout)
return res
}
@ -318,6 +322,12 @@ func parseConnectionLabels(r *bytes.Reader) (label []byte) {
return
}
func parseConnectionZone(r *bytes.Reader) (zone uint16) {
parseBERaw16(r, &zone)
r.Seek(2, seekCurrent)
return
}
func parseRawData(data []byte) *ConntrackFlow {
s := &ConntrackFlow{}
// First there is the Nfgenmsg header
@ -369,6 +379,8 @@ func parseRawData(data []byte) *ConntrackFlow {
s.TimeOut = parseTimeOut(reader)
case nl.CTA_STATUS, nl.CTA_USE, nl.CTA_ID:
skipNfAttrValue(reader, l)
case nl.CTA_ZONE:
s.Zone = parseConnectionZone(reader)
default:
skipNfAttrValue(reader, l)
}
@ -438,6 +450,7 @@ type ConntrackFilter struct {
portFilter map[ConntrackFilterType]uint16
protoFilter uint8
labelFilter map[ConntrackFilterType][][]byte
zoneFilter *uint16
}
// AddIPNet adds a IP subnet to the conntrack filter
@ -493,11 +506,11 @@ func (f *ConntrackFilter) AddProtocol(proto uint8) error {
// AddLabels adds the provided list (zero or more) of labels to the conntrack filter
// ConntrackFilterType here can be either:
// 1) ConntrackMatchLabels: This matches every flow that has a label value (len(flow.Labels) > 0)
// 1. ConntrackMatchLabels: This matches every flow that has a label value (len(flow.Labels) > 0)
// against the list of provided labels. If `flow.Labels` contains ALL the provided labels
// it is considered a match. This can be used when you want to match flows that contain
// one or more labels.
// 2) ConntrackUnmatchLabels: This matches every flow that has a label value (len(flow.Labels) > 0)
// 2. ConntrackUnmatchLabels: This matches every flow that has a label value (len(flow.Labels) > 0)
// against the list of provided labels. If `flow.Labels` does NOT contain ALL the provided labels
// it is considered a match. This can be used when you want to match flows that don't contain
// one or more labels.
@ -515,10 +528,19 @@ func (f *ConntrackFilter) AddLabels(tp ConntrackFilterType, labels [][]byte) err
return nil
}
// AddZone adds a zone to the conntrack filter
func (f *ConntrackFilter) AddZone(zone uint16) error {
if f.zoneFilter != nil {
return errors.New("Filter attribute already present")
}
f.zoneFilter = &zone
return nil
}
// MatchConntrackFlow applies the filter to the flow and returns true if the flow matches the filter
// false otherwise
func (f *ConntrackFilter) MatchConntrackFlow(flow *ConntrackFlow) bool {
if len(f.ipNetFilter) == 0 && len(f.portFilter) == 0 && f.protoFilter == 0 && len(f.labelFilter) == 0 {
if len(f.ipNetFilter) == 0 && len(f.portFilter) == 0 && f.protoFilter == 0 && len(f.labelFilter) == 0 && f.zoneFilter == nil {
// empty filter always not match
return false
}
@ -529,6 +551,11 @@ func (f *ConntrackFilter) MatchConntrackFlow(flow *ConntrackFlow) bool {
return false
}
// Conntrack zone filter
if f.zoneFilter != nil && *f.zoneFilter != flow.Zone {
return false
}
match := true
// IP conntrack filter

17
conntrack_test.go
View File

@ -381,6 +381,7 @@ func TestConntrackFilter(t *testing.T) {
Protocol: 6,
},
Labels: []byte{0, 0, 0, 0, 3, 4, 61, 141, 207, 170, 2, 0, 0, 0, 0, 0},
Zone: 200,
},
ConntrackFlow{
FamilyType: unix.AF_INET6,
@ -398,6 +399,7 @@ func TestConntrackFilter(t *testing.T) {
DstPort: 1000,
Protocol: 132,
},
Zone: 200,
})
// Empty filter
@ -755,6 +757,16 @@ func TestConntrackFilter(t *testing.T) {
t.Fatalf("Error, there should be only 1 match, v4:%d, v6:%d", v4Match, v6Match)
}
filterV4 = &ConntrackFilter{}
err = filterV4.AddZone(200)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
filterV6 = &ConntrackFilter{}
v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
if v4Match != 2 || v6Match != 0 {
t.Fatalf("Error, there should be only 1 match, v4:%d, v6:%d", v4Match, v6Match)
}
}
func TestParseRawData(t *testing.T) {
@ -943,13 +955,16 @@ func TestParseRawData(t *testing.T) {
/* >>>> CTA_COUNTERS_BYTES */
12, 0, 2, 0,
0, 0, 0, 0, 0, 0, 7, 66,
/* >> CTA_ZONE */
8, 0, 18, 0,
0, 100, 0, 0,
/* >> nested CTA_TIMESTAMP */
16, 0, 20, 128,
/* >>>> CTA_TIMESTAMP_START */
12, 0, 1, 0,
22, 134, 80, 175, 134, 10, 182, 221},
expConntrackFlow: "tcp\t6 src=192.168.0.10 dst=192.168.77.73 sport=42625 dport=3333 packets=11 bytes=1914\t" +
"src=192.168.77.73 dst=192.168.0.10 sport=3333 dport=42625 packets=10 bytes=1858 mark=0x5 " +
"src=192.168.77.73 dst=192.168.0.10 sport=3333 dport=42625 packets=10 bytes=1858 mark=0x5 zone=100 " +
"start=2021-06-07 13:43:50.511990493 +0000 UTC stop=1970-01-01 00:00:00 +0000 UTC timeout=152(sec)",
},
}

1
nl/conntrack_linux.go
View File

@ -88,6 +88,7 @@ const (
CTA_COUNTERS_REPLY = 10
CTA_USE = 11
CTA_ID = 12
CTA_ZONE = 18
CTA_TIMESTAMP = 20
CTA_LABELS = 22
)