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datapath_trace.go
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datapath_trace.go
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// Copyright 2016-2018 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 monitor
import (
"encoding/json"
"fmt"
)
const (
// TraceNotifyLen is the amount of packet data provided in a trace notification
TraceNotifyLen = 32
)
// TraceNotify is the message format of a trace notification in the BPF ring buffer
type TraceNotify struct {
Type uint8
ObsPoint uint8
Source uint16
Hash uint32
OrigLen uint32
CapLen uint32
SrcLabel uint32
DstLabel uint32
DstID uint16
Reason uint8
Pad uint8
Ifindex uint32
// data
}
// Available observation points.
const (
TraceToLxc = iota
TraceToProxy
TraceToHost
TraceToStack
TraceToOverlay
TraceFromLxc
TraceFromProxy
TraceFromHost
TraceFromStack
TraceFromOverlay
)
var traceObsPoints = map[uint8]string{
TraceToLxc: "to-endpoint",
TraceToProxy: "to-proxy",
TraceToHost: "to-host",
TraceToStack: "to-stack",
TraceToOverlay: "to-overlay",
TraceFromLxc: "from-endpoint",
TraceFromProxy: "from-proxy",
TraceFromHost: "from-host",
TraceFromStack: "from-stack",
TraceFromOverlay: "from-overlay",
}
func obsPoint(obsPoint uint8) string {
if str, ok := traceObsPoints[obsPoint]; ok {
return str
}
return fmt.Sprintf("%d", obsPoint)
}
// Reasons for forwarding a packet.
const (
TraceReasonPolicy = iota
TraceReasonCtEstablished
TraceReasonCtReply
TraceReasonCtRelated
)
var traceReasons = map[uint8]string{
TraceReasonPolicy: "new",
TraceReasonCtEstablished: "established",
TraceReasonCtReply: "reply",
TraceReasonCtRelated: "related",
}
func connState(reason uint8) string {
if str, ok := traceReasons[reason]; ok {
return str
}
return fmt.Sprintf("%d", reason)
}
func (n *TraceNotify) traceSummary() string {
switch n.ObsPoint {
case TraceToLxc:
return fmt.Sprintf("-> endpoint %d", n.DstID)
case TraceToProxy:
return "-> proxy"
case TraceToHost:
return "-> host from"
case TraceToStack:
return "-> stack"
case TraceToOverlay:
return "-> overlay"
case TraceFromLxc:
return fmt.Sprintf("<- endpoint %d", n.Source)
case TraceFromProxy:
return "<- proxy"
case TraceFromHost:
return "<- host"
case TraceFromStack:
return "<- stack"
case TraceFromOverlay:
return "<- overlay"
default:
return "unknown trace"
}
}
// DumpInfo prints a summary of the trace messages.
func (n *TraceNotify) DumpInfo(data []byte) {
fmt.Printf("%s flow %#x identity %d->%d state %s ifindex %s: %s\n",
n.traceSummary(), n.Hash, n.SrcLabel, n.DstLabel,
connState(n.Reason), ifname(int(n.Ifindex)), GetConnectionSummary(data[TraceNotifyLen:]))
}
// DumpVerbose prints the trace notification in human readable form
func (n *TraceNotify) DumpVerbose(dissect bool, data []byte, prefix string) {
fmt.Printf("%s MARK %#x FROM %d %s: %d bytes (%d captured), state %s",
prefix, n.Hash, n.Source, obsPoint(n.ObsPoint), n.OrigLen, n.CapLen, connState(n.Reason))
if n.Ifindex != 0 {
fmt.Printf(", interface %s", ifname(int(n.Ifindex)))
}
if n.SrcLabel != 0 || n.DstLabel != 0 {
fmt.Printf(", identity %d->%d", n.SrcLabel, n.DstLabel)
}
if n.DstID != 0 {
fmt.Printf(", to endpoint %d\n", n.DstID)
} else {
fmt.Printf("\n")
}
if n.CapLen > 0 && len(data) > TraceNotifyLen {
Dissect(dissect, data[TraceNotifyLen:])
}
}
func (n *TraceNotify) getJSON(data []byte, cpuPrefix string) (string, error) {
v := TraceNotifyToVerbose(n)
v.CPUPrefix = cpuPrefix
if n.CapLen > 0 && len(data) > TraceNotifyLen {
v.Summary = GetDissectSummary(data[TraceNotifyLen:])
}
ret, err := json.Marshal(v)
return string(ret), err
}
// DumpJSON prints notification in json format
func (n *TraceNotify) DumpJSON(data []byte, cpuPrefix string) {
resp, err := n.getJSON(data, cpuPrefix)
if err == nil {
fmt.Println(resp)
}
}
// TraceNotifyVerbose represents a json notification printed by monitor
type TraceNotifyVerbose struct {
CPUPrefix string `json:"cpu,omitempty"`
Type string `json:"type,omitempty"`
Mark string `json:"mark,omitempty"`
Ifindex string `json:"ifindex,omitempty"`
State string `json:"state,omitempty"`
ObservationPoint string `json:"observationPoint"`
TraceSummary string `json:"traceSummary"`
Source uint16 `json:"source"`
Bytes uint32 `json:"bytes"`
SrcLabel uint32 `json:"srcLabel"`
DstLabel uint32 `json:"dstLabel"`
DstID uint16 `json:"dstID"`
Summary *DissectSummary `json:"summary,omitempty"`
}
// TraceNotifyToVerbose creates verbose notification from base TraceNotify
func TraceNotifyToVerbose(n *TraceNotify) TraceNotifyVerbose {
return TraceNotifyVerbose{
Type: "trace",
Mark: fmt.Sprintf("%#x", n.Hash),
Ifindex: ifname(int(n.Ifindex)),
State: connState(n.Reason),
ObservationPoint: obsPoint(n.ObsPoint),
TraceSummary: n.traceSummary(),
Source: n.Source,
Bytes: n.OrigLen,
SrcLabel: n.SrcLabel,
DstLabel: n.DstLabel,
DstID: n.DstID,
}
}