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nflog_common.go
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nflog_common.go
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package nflog
import (
"context"
"fmt"
"net"
"strconv"
"strings"
"go.aporeto.io/trireme-lib/v11/collector"
"go.aporeto.io/trireme-lib/v11/controller/pkg/packet"
"go.aporeto.io/trireme-lib/v11/controller/pkg/pucontext"
"go.aporeto.io/trireme-lib/v11/policy"
"go.uber.org/zap"
)
// NFLogger provides an interface for NFLog
type NFLogger interface {
Run(ctx context.Context)
}
// GetPUContextFunc provides PU information given the id
type GetPUContextFunc func(hash string) (*pucontext.PUContext, error)
func recordDroppedPacket(payload []byte, protocol uint8, srcIP, dstIP net.IP, srcPort, dstPort uint16, pu *pucontext.PUContext) (*collector.PacketReport, error) {
report := &collector.PacketReport{}
report.PUID = pu.ManagementID()
report.Namespace = pu.ManagementNamespace()
ipPacket, err := packet.New(packet.PacketTypeNetwork, payload, "", false)
if err == nil {
report.Length = int(ipPacket.GetIPLength())
report.PacketID, _ = strconv.Atoi(ipPacket.ID())
} else {
zap.L().Debug("payload not valid", zap.Error(err))
return nil, err
}
if protocol == packet.IPProtocolTCP || protocol == packet.IPProtocolUDP {
report.SourcePort = int(srcPort)
report.DestinationPort = int(dstPort)
}
if protocol == packet.IPProtocolTCP {
report.TCPFlags = int(ipPacket.GetTCPFlags())
}
report.Protocol = int(protocol)
report.DestinationIP = dstIP.String()
report.SourceIP = srcIP.String()
report.TriremePacket = false
report.DropReason = collector.PacketDrop
if payload == nil {
report.Payload = []byte{}
return report, nil
}
if len(payload) <= 64 {
report.Payload = make([]byte, len(payload))
copy(report.Payload, payload)
} else {
report.Payload = make([]byte, 64)
copy(report.Payload, payload[0:64])
}
return report, nil
}
func recordFromNFLogData(payload []byte, prefix string, protocol uint8, srcIP, dstIP net.IP, srcPort, dstPort uint16, getPUContext GetPUContextFunc, puIsSource bool) (*collector.FlowRecord, *collector.PacketReport, error) {
var packetReport *collector.PacketReport
var err error
// `hashID:policyID:extServiceID:action`
parts := strings.SplitN(prefix, ":", 4)
if len(parts) != 4 {
return nil, nil, fmt.Errorf("nflog: prefix doesn't contain sufficient information: %s", prefix)
}
hashID, policyID, extServiceID, encodedAction := parts[0], parts[1], parts[2], parts[3]
pu, err := getPUContext(hashID)
if err != nil {
return nil, nil, err
}
if encodedAction == "10" {
packetReport, err = recordDroppedPacket(payload, protocol, srcIP, dstIP, srcPort, dstPort, pu)
return nil, packetReport, err
}
action, _, err := policy.EncodedStringToAction(encodedAction)
if err != nil {
return nil, packetReport, fmt.Errorf("nflog: unable to decode action for context id: %s (%s)", pu.ID(), encodedAction)
}
dropReason := ""
if action.Rejected() {
dropReason = collector.PolicyDrop
}
// point fix for now.
var destination *collector.EndPoint
if protocol == packet.IPProtocolUDP || protocol == packet.IPProtocolTCP {
destination = &collector.EndPoint{
IP: dstIP.String(),
Port: dstPort,
}
} else {
destination = &collector.EndPoint{
IP: dstIP.String(),
}
}
record := &collector.FlowRecord{
ContextID: pu.ID(),
Source: &collector.EndPoint{
IP: srcIP.String(),
},
Destination: destination,
DropReason: dropReason,
PolicyID: policyID,
Tags: pu.Annotations().Copy(),
Action: action,
L4Protocol: protocol,
Namespace: pu.ManagementNamespace(),
Count: 1,
}
if action.Observed() {
record.ObservedAction = action
record.ObservedPolicyID = policyID
}
if puIsSource {
record.Source.Type = collector.EnpointTypePU
record.Source.ID = pu.ManagementID()
record.Destination.Type = collector.EndPointTypeExternalIP
record.Destination.ID = extServiceID
} else {
record.Source.Type = collector.EndPointTypeExternalIP
record.Source.ID = extServiceID
record.Destination.Type = collector.EnpointTypePU
record.Destination.ID = pu.ManagementID()
}
return record, packetReport, nil
}