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完善 conntrack 序列化和反序列化 #11

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Merged
eustrainLee merged 3 commits into from
Dec 17, 2025
Merged

完善 conntrack 序列化和反序列化 #11

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951b05b
feat: implement ct labels mask in toNlData
eustrainLee Dec 16, 2025
293b878
feat: support icmp proto in toNlData
eustrainLee Dec 16, 2025
34c6da1
feat: support ct zone
eustrainLee Dec 17, 2025
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52 changes: 47 additions & 5 deletions conntrack_linux.go
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Original file line number Diff line number Diff line change
Expand Up @@ -318,10 +318,34 @@ func (t *IPTuple) toNlData(family uint8) ([]*nl.RtAttr, error) {
ctTupleProto := nl.NewRtAttr(unix.NLA_F_NESTED|nl.CTA_TUPLE_PROTO, nil)
ctTupleProtoNum := nl.NewRtAttr(nl.CTA_PROTO_NUM, []byte{t.Protocol})
ctTupleProto.AddChild(ctTupleProtoNum)
ctTupleProtoSrcPort := nl.NewRtAttr(nl.CTA_PROTO_SRC_PORT, nl.BEUint16Attr(t.SrcPort))
ctTupleProto.AddChild(ctTupleProtoSrcPort)
ctTupleProtoDstPort := nl.NewRtAttr(nl.CTA_PROTO_DST_PORT, nl.BEUint16Attr(t.DstPort))
ctTupleProto.AddChild(ctTupleProtoDstPort)

// For ICMP/ICMPv6, use ICMP-specific attributes instead of ports
switch t.Protocol {
case unix.IPPROTO_ICMP:
ctTupleProtoICMPID := nl.NewRtAttr(nl.CTA_PROTO_ICMP_ID, nl.BEUint16Attr(t.ICMPID))
ctTupleProto.AddChild(ctTupleProtoICMPID)
ctTupleProtoICMPType := nl.NewRtAttr(nl.CTA_PROTO_ICMP_TYPE, []byte{t.ICMPType})
ctTupleProto.AddChild(ctTupleProtoICMPType)
ctTupleProtoICMPCode := nl.NewRtAttr(nl.CTA_PROTO_ICMP_CODE, []byte{t.ICMPCode})
ctTupleProto.AddChild(ctTupleProtoICMPCode)
case unix.IPPROTO_ICMPV6:
ctTupleProtoICMPV6ID := nl.NewRtAttr(nl.CTA_PROTO_ICMPV6_ID, nl.BEUint16Attr(t.ICMPID))
ctTupleProto.AddChild(ctTupleProtoICMPV6ID)
ctTupleProtoICMPV6Type := nl.NewRtAttr(nl.CTA_PROTO_ICMPV6_TYPE, []byte{t.ICMPType})
ctTupleProto.AddChild(ctTupleProtoICMPV6Type)
ctTupleProtoICMPV6Code := nl.NewRtAttr(nl.CTA_PROTO_ICMPV6_CODE, []byte{t.ICMPCode})
ctTupleProto.AddChild(ctTupleProtoICMPV6Code)
case unix.IPPROTO_TCP, unix.IPPROTO_UDP, unix.IPPROTO_DCCP, unix.IPPROTO_SCTP, unix.IPPROTO_UDPLITE:
// For other protocols (TCP, UDP, etc.), use port attributes
ctTupleProtoSrcPort := nl.NewRtAttr(nl.CTA_PROTO_SRC_PORT, nl.BEUint16Attr(t.SrcPort))
ctTupleProto.AddChild(ctTupleProtoSrcPort)
ctTupleProtoDstPort := nl.NewRtAttr(nl.CTA_PROTO_DST_PORT, nl.BEUint16Attr(t.DstPort))
ctTupleProto.AddChild(ctTupleProtoDstPort)
case unix.IPPROTO_IPIP:
fallthrough
default:
// do nothing
}

return []*nl.RtAttr{ctTupleIP, ctTupleProto}, nil
}
Expand Down Expand Up @@ -413,6 +437,8 @@ func (s *ConntrackFlow) toNlData() ([]*nl.RtAttr, error) {
// <BEuint16>
// <len, CTA_PROTO_DST_PORT>
// <BEuint16>
// <len, CTA_ZONE>
// <BEuint16>
// <len, CTA_STATUS>
// <uint64>
// <len, CTA_MARK>
Expand All @@ -421,6 +447,8 @@ func (s *ConntrackFlow) toNlData() ([]*nl.RtAttr, error) {
// <BEuint64>
// <len, CTA_LABELS>
// <binary data>
// <len, CTA_LABELS_MASK>
// <binary data>
// <len, NLA_F_NESTED|CTA_PROTOINFO>

// CTA_TUPLE_ORIG
Expand All @@ -447,13 +475,27 @@ func (s *ConntrackFlow) toNlData() ([]*nl.RtAttr, error) {
ctTimeout := nl.NewRtAttr(nl.CTA_TIMEOUT, nl.BEUint32Attr(s.TimeOut))

payload = append(payload, ctTupleOrig, ctTupleReply, ctMark, ctTimeout)
// Labels: nil => do not send; 16 zero bytes => clear all labels.
// Zone is required for matching conntrack entries in the kernel
// The kernel uses zone when looking up conntrack entries: nf_conntrack_find_get(net, &zone, &otuple)
if s.Zone != 0 {
ctZone := nl.NewRtAttr(nl.CTA_ZONE, nl.BEUint16Attr(s.Zone))
payload = append(payload, ctZone)
}
// Labels: nil => do not send; 16 zero bytes => update conntrack labels.
if s.Labels != nil {
if len(s.Labels) != 16 {
return nil, fmt.Errorf("conntrack CTA_LABELS must be 16 bytes, got %d", len(s.Labels))
}
ctLabels := nl.NewRtAttr(nl.CTA_LABELS, s.Labels)
payload = append(payload, ctLabels)
// Labels Mask: nil => do not send; 16 zero bytes => update conntrack labels with mask.
if s.LabelsMask != nil {
if len(s.LabelsMask) != 16 {
return nil, fmt.Errorf("conntrack CTA_LABELS_MASK must be 16 bytes, got %d", len(s.LabelsMask))
}
ctLabelsMask := nl.NewRtAttr(nl.CTA_LABELS_MASK, s.LabelsMask)
payload = append(payload, ctLabelsMask)
}
}

if s.ProtoInfo != nil {
Expand Down