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datapath_debug.go
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datapath_debug.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 monitor
import (
"encoding/json"
"fmt"
"net"
"github.com/cilium/cilium/pkg/byteorder"
"github.com/cilium/cilium/pkg/monitor/api"
)
// must be in sync with <bpf/lib/dbg.h>
const (
DbgCaptureUnspec = iota
DbgCaptureReserved1
DbgCaptureReserved2
DbgCaptureReserved3
DbgCaptureDelivery
DbgCaptureFromLb
DbgCaptureAfterV46
DbgCaptureAfterV64
DbgCaptureProxyPre
DbgCaptureProxyPost
)
// must be in sync with <bpf/lib/dbg.h>
const (
DbgUnspec = iota
DbgGeneric
DbgLocalDelivery
DbgEncap
DbgLxcFound
DbgPolicyDenied
DbgCtLookup
DbgCtLookupRev
DbgCtMatch
DbgCtCreated
DbgCtCreated2
DbgIcmp6Handle
DbgIcmp6Request
DbgIcmp6Ns
DbgIcmp6TimeExceeded
DbgCtVerdict
DbgDecap
DbgPortMap
DbgErrorRet
DbgToHost
DbgToStack
DbgPktHash
DbgLb6LookupMaster
DbgLb6LookupMasterFail
DbgLb6LookupSlave
DbgLb6LookupSlaveSuccess
DbgLb6LookupSlaveV2Fail
DbgLb6LookupBackendFail
DbgLb6ReverseNatLookup
DbgLb6ReverseNat
DbgLb4LookupMaster
DbgLb4LookupMasterFail
DbgLb4LookupSlave
DbgLb4LookupSlaveSuccess
DbgLb4LookupSlaveV2Fail
DbgLb4LookupBackendFail
DbgLb4ReverseNatLookup
DbgLb4ReverseNat
DbgLb4LoopbackSnat
DbgLb4LoopbackSnatRev
DbgCtLookup4
DbgRRSlaveSel
DbgRevProxyLookup
DbgRevProxyFound
DbgRevProxyUpdate
DbgL4Policy
DbgNetdevInCluster
DbgNetdevEncap4
DbgCTLookup41
DbgCTLookup42
DbgCTCreated4
DbgCTLookup61
DbgCTLookup62
DbgCTCreated6
DbgSkipProxy
DbgL4Create
DbgIPIDMapFailed4
DbgIPIDMapFailed6
DbgIPIDMapSucceed4
DbgIPIDMapSucceed6
)
// must be in sync with <bpf/lib/conntrack.h>
const (
CtNew uint32 = iota
CtEstablished
CtReply
CtRelated
)
var ctStateText = map[uint32]string{
CtNew: "New",
CtEstablished: "Established",
CtReply: "Reply",
CtRelated: "Related",
}
const (
ctEgress = 0
ctIngress = 1
)
var ctDirection = map[int]string{
ctEgress: "egress",
ctIngress: "ingress",
}
func ctState(state uint32) string {
txt, ok := ctStateText[state]
if ok {
return txt
}
return api.DropReason(uint8(state))
}
var tupleFlags = map[int16]string{
0: "IN",
1: "OUT",
2: "RELATED",
}
func ctFlags(flags int16) string {
s := ""
for k, v := range tupleFlags {
if k&flags != 0 {
if s != "" {
s += ", "
}
s += v
}
}
return s
}
func ctInfo(arg1 uint32, arg2 uint32) string {
return fmt.Sprintf("sport=%d dport=%d nexthdr=%d flags=%s",
arg1>>16, arg1&0xFFFF, arg2>>8, ctFlags(int16(arg2&0xFF)))
}
func ctLookup4Info1(n *DebugMsg) string {
return fmt.Sprintf("src=%s:%d dst=%s:%d", ip4Str(n.Arg1),
n.Arg3&0xFFFF, ip4Str(n.Arg2), n.Arg3>>16)
}
func ctLookup4Info2(n *DebugMsg) string {
return fmt.Sprintf("nexthdr=%d flags=%d",
n.Arg1>>8, n.Arg1&0xFF)
}
func ctCreate4Info(n *DebugMsg) string {
return fmt.Sprintf("proxy-port=%d revnat=%d src-identity=%d lb=%s",
n.Arg1>>16, byteorder.NetworkToHost(uint16(n.Arg1&0xFFFF)), n.Arg2, ip4Str(n.Arg3))
}
func ctLookup6Info1(n *DebugMsg) string {
return fmt.Sprintf("src=[::%s]:%d dst=[::%s]:%d", ip6Str(n.Arg1),
n.Arg3&0xFFFF, ip6Str(n.Arg2), n.Arg3>>16)
}
func ctCreate6Info(n *DebugMsg) string {
return fmt.Sprintf("proxy-port=%d revnat=%d src-identity=%d",
n.Arg1>>16, byteorder.NetworkToHost(uint16(n.Arg1&0xFFFF)), n.Arg2)
}
func verdictInfo(arg uint32) string {
revnat := byteorder.NetworkToHost(uint16(arg & 0xFFFF))
return fmt.Sprintf("revnat=%d", revnat)
}
func proxyInfo(arg1 uint32, arg2 uint32) string {
sport := byteorder.NetworkToHost(uint16(arg1 >> 16))
dport := byteorder.NetworkToHost(uint16(arg1 & 0xFFFF))
return fmt.Sprintf("sport=%d dport=%d saddr=%s", sport, dport, ip4Str(arg2))
}
func l4CreateInfo(n *DebugMsg) string {
src := n.Arg1
dst := n.Arg2
dport := byteorder.NetworkToHost(uint16(n.Arg3 >> 16))
proto := n.Arg3 & 0xFF
return fmt.Sprintf("src=%d dst=%d dport=%d proto=%d", src, dst, dport, proto)
}
func ip4Str(arg1 uint32) string {
ip := make(net.IP, 4)
byteorder.NetworkToHostPut(ip, arg1)
return ip.String()
}
func ip6Str(arg1 uint32) string {
ip6 := byteorder.NetworkToHost(arg1).(uint32)
return fmt.Sprintf("%x:%x", ip6>>16, ip6&0xFFFF)
}
// DebugMsg is the message format of the debug message found in the BPF ring buffer
type DebugMsg struct {
Type uint8
SubType uint8
Source uint16
Hash uint32
Arg1 uint32
Arg2 uint32
Arg3 uint32
}
// DumpInfo prints a summary of a subset of the debug messages which are related
// to sending, not processing, of packets.
func (n *DebugMsg) DumpInfo(data []byte) {
}
// Dump prints the debug message in a human readable format.
func (n *DebugMsg) Dump(prefix string) {
fmt.Printf("%s MARK %#x FROM %d DEBUG: %s\n", prefix, n.Hash, n.Source, n.subTypeString())
}
func (n *DebugMsg) subTypeString() string {
switch n.SubType {
case DbgGeneric:
return fmt.Sprintf("No message, arg1=%d (%#x) arg2=%d (%#x)", n.Arg1, n.Arg1, n.Arg2, n.Arg2)
case DbgLocalDelivery:
return fmt.Sprintf("Attempting local delivery for container id %d from seclabel %d", n.Arg1, n.Arg2)
case DbgEncap:
return fmt.Sprintf("Encapsulating to node %d (%#x) from seclabel %d", n.Arg1, n.Arg1, n.Arg2)
case DbgLxcFound:
return fmt.Sprintf("Local container found ifindex %s seclabel %d", ifname(int(n.Arg1)), byteorder.NetworkToHost(uint16(n.Arg2)))
case DbgPolicyDenied:
return fmt.Sprintf("Policy evaluation would deny packet from %d to %d", n.Arg1, n.Arg2)
case DbgCtLookup:
return fmt.Sprintf("CT lookup: %s", ctInfo(n.Arg1, n.Arg2))
case DbgCtLookupRev:
return fmt.Sprintf("CT reverse lookup: %s", ctInfo(n.Arg1, n.Arg2))
case DbgCtLookup4:
return fmt.Sprintf("CT lookup address: %s", ip4Str(n.Arg1))
case DbgCtMatch:
return fmt.Sprintf("CT entry found lifetime=%d, %s", n.Arg1,
verdictInfo(n.Arg2))
case DbgCtCreated:
return fmt.Sprintf("CT created 1/2: %s %s",
ctInfo(n.Arg1, n.Arg2), verdictInfo(n.Arg3))
case DbgCtCreated2:
return fmt.Sprintf("CT created 2/2: %s revnat=%d", ip4Str(n.Arg1), byteorder.NetworkToHost(uint16(n.Arg2)))
case DbgCtVerdict:
return fmt.Sprintf("CT verdict: %s, %s",
ctState(n.Arg1), verdictInfo(n.Arg2))
case DbgIcmp6Handle:
return fmt.Sprintf("Handling ICMPv6 type=%d", n.Arg1)
case DbgIcmp6Request:
return fmt.Sprintf("ICMPv6 echo request for router offset=%d", n.Arg1)
case DbgIcmp6Ns:
return fmt.Sprintf("ICMPv6 neighbour soliciation for address %x:%x", n.Arg1, n.Arg2)
case DbgIcmp6TimeExceeded:
return fmt.Sprintf("Sending ICMPv6 time exceeded")
case DbgDecap:
return fmt.Sprintf("Tunnel decap: id=%d flowlabel=%x", n.Arg1, n.Arg2)
case DbgPortMap:
return fmt.Sprintf("Mapping port from=%d to=%d", n.Arg1, n.Arg2)
case DbgErrorRet:
return fmt.Sprintf("BPF function %d returned error %d", n.Arg1, n.Arg2)
case DbgToHost:
return fmt.Sprintf("Going to host, policy-skip=%d", n.Arg1)
case DbgToStack:
return fmt.Sprintf("Going to the stack, policy-skip=%d", n.Arg1)
case DbgPktHash:
return fmt.Sprintf("Packet hash=%d (%#x), selected_service=%d", n.Arg1, n.Arg1, n.Arg2)
case DbgRRSlaveSel:
return fmt.Sprintf("RR slave selection hash=%d (%#x), selected_service=%d", n.Arg1, n.Arg1, n.Arg2)
case DbgLb6LookupMaster:
return fmt.Sprintf("Master service lookup, addr.p4=%x key.dport=%d", n.Arg1, byteorder.NetworkToHost(uint16(n.Arg2)))
case DbgLb6LookupMasterFail:
return fmt.Sprintf("Master service lookup failed, addr.p2=%x addr.p3=%x", n.Arg1, n.Arg2)
case DbgLb6LookupSlave, DbgLb4LookupSlave:
return fmt.Sprintf("Slave service lookup: slave=%d, dport=%d", n.Arg1, byteorder.NetworkToHost(uint16(n.Arg2)))
case DbgLb6LookupSlaveV2Fail, DbgLb4LookupSlaveV2Fail:
return fmt.Sprintf("Slave service lookup failed: slave=%d, dport=%d", n.Arg1, byteorder.NetworkToHost(uint16(n.Arg2)))
case DbgLb6LookupBackendFail, DbgLb4LookupBackendFail:
return fmt.Sprintf("Backend service lookup failed: backend_id=%d", n.Arg1)
case DbgLb6LookupSlaveSuccess:
return fmt.Sprintf("Slave service lookup result: target.p4=%x port=%d", n.Arg1, byteorder.NetworkToHost(uint16(n.Arg2)))
case DbgLb6ReverseNatLookup, DbgLb4ReverseNatLookup:
return fmt.Sprintf("Reverse NAT lookup, index=%d", byteorder.NetworkToHost(uint16(n.Arg1)))
case DbgLb6ReverseNat:
return fmt.Sprintf("Performing reverse NAT, address.p4=%x port=%d", n.Arg1, byteorder.NetworkToHost(uint16(n.Arg2)))
case DbgLb4LookupMaster:
return fmt.Sprintf("Master service lookup, addr=%s key.dport=%d", ip4Str(n.Arg1), byteorder.NetworkToHost(uint16(n.Arg2)))
case DbgLb4LookupMasterFail:
return fmt.Sprintf("Master service lookup failed")
case DbgLb4LookupSlaveSuccess:
return fmt.Sprintf("Slave service lookup result: target=%s port=%d", ip4Str(n.Arg1), byteorder.NetworkToHost(uint16(n.Arg2)))
case DbgLb4ReverseNat:
return fmt.Sprintf("Performing reverse NAT, address=%s port=%d", ip4Str(n.Arg1), byteorder.NetworkToHost(uint16(n.Arg2)))
case DbgLb4LoopbackSnat:
return fmt.Sprintf("Loopback SNAT from=%s to=%s", ip4Str(n.Arg1), ip4Str(n.Arg2))
case DbgLb4LoopbackSnatRev:
return fmt.Sprintf("Loopback reverse SNAT from=%s to=%s", ip4Str(n.Arg1), ip4Str(n.Arg2))
case DbgRevProxyLookup:
return fmt.Sprintf("Reverse proxy lookup %s nexthdr=%d",
proxyInfo(n.Arg1, n.Arg2), n.Arg3)
case DbgRevProxyFound:
return fmt.Sprintf("Reverse proxy entry found, orig-daddr=%s orig-dport=%d", ip4Str(n.Arg1), n.Arg2)
case DbgRevProxyUpdate:
return fmt.Sprintf("Reverse proxy updated %s nexthdr=%d",
proxyInfo(n.Arg1, n.Arg2), n.Arg3)
case DbgL4Policy:
return fmt.Sprintf("Resolved L4 policy to: %d / %s",
byteorder.NetworkToHost(uint16(n.Arg1)), ctDirection[int(n.Arg2)])
case DbgNetdevInCluster:
return fmt.Sprintf("Destination is inside cluster prefix, source identity: %d", n.Arg1)
case DbgNetdevEncap4:
return fmt.Sprintf("Attempting encapsulation, lookup key: %s, identity: %d", ip4Str(n.Arg1), n.Arg2)
case DbgCTLookup41:
return fmt.Sprintf("Conntrack lookup 1/2: %s", ctLookup4Info1(n))
case DbgCTLookup42:
return fmt.Sprintf("Conntrack lookup 2/2: %s", ctLookup4Info2(n))
case DbgCTCreated4:
return fmt.Sprintf("Conntrack create: %s", ctCreate4Info(n))
case DbgCTLookup61:
return fmt.Sprintf("Conntrack lookup 1/2: %s", ctLookup6Info1(n))
case DbgCTLookup62:
return fmt.Sprintf("Conntrack lookup 2/2: %s", ctLookup4Info2(n))
case DbgCTCreated6:
return fmt.Sprintf("Conntrack create: %s", ctCreate6Info(n))
case DbgSkipProxy:
return fmt.Sprintf("Skipping proxy, tc_index is set=%x", n.Arg1)
case DbgL4Create:
return fmt.Sprintf("Matched L4 policy; creating conntrack %s", l4CreateInfo(n))
case DbgIPIDMapFailed4:
return fmt.Sprintf("Failed to map daddr=%s to identity", ip4Str(n.Arg1))
case DbgIPIDMapFailed6:
return fmt.Sprintf("Failed to map daddr.p4=[::%s] to identity", ip6Str(n.Arg1))
case DbgIPIDMapSucceed4:
return fmt.Sprintf("Successfully mapped daddr=%s to identity=%d", ip4Str(n.Arg1), n.Arg2)
case DbgIPIDMapSucceed6:
return fmt.Sprintf("Successfully mapped daddr.p4=[::%s] to identity=%d", ip6Str(n.Arg1), n.Arg2)
default:
return fmt.Sprintf("Unknown message type=%d arg1=%d arg2=%d", n.SubType, n.Arg1, n.Arg2)
}
}
func (n *DebugMsg) getJSON(cpuPrefix string) string {
return fmt.Sprintf(`{"cpu":%q,"type":"debug","message":%q}`,
cpuPrefix, n.subTypeString())
}
// DumpJSON prints notification in json format
func (n *DebugMsg) DumpJSON(cpuPrefix string) {
fmt.Println(n.getJSON(cpuPrefix))
}
const (
// DebugCaptureLen is the amount of packet data in a packet capture message
DebugCaptureLen = 24
)
// DebugCapture is the metadata sent along with a captured packet frame
type DebugCapture struct {
Type uint8
SubType uint8
// Source, if populated, is the ID of the source endpoint.
Source uint16
Hash uint32
Len uint32
OrigLen uint32
Arg1 uint32
Arg2 uint32
// data
}
type endpointInfo struct {
name string
identity int
}
// DumpInfo prints a summary of the capture messages.
func (n *DebugCapture) DumpInfo(data []byte) {
prefix := n.infoPrefix()
if len(prefix) > 0 {
fmt.Printf("%s: %s\n", prefix, GetConnectionSummary(data[DebugCaptureLen:]))
}
}
func (n *DebugCapture) infoPrefix() string {
switch n.SubType {
case DbgCaptureDelivery:
return fmt.Sprintf("-> %s", ifname(int(n.Arg1)))
case DbgCaptureFromLb:
return fmt.Sprintf("<- load-balancer %s", ifname(int(n.Arg1)))
case DbgCaptureAfterV46:
return fmt.Sprintf("== v4->v6 %d", n.Arg1)
case DbgCaptureAfterV64:
return fmt.Sprintf("== v6->v4 %d", n.Arg1)
case DbgCaptureProxyPost:
return fmt.Sprintf("-> proxy port %d", byteorder.NetworkToHost(uint16(n.Arg1)))
default:
return ""
}
}
// DumpVerbose prints the captured packet in human readable format
func (n *DebugCapture) DumpVerbose(dissect bool, data []byte, prefix string) {
fmt.Printf("%s MARK %#x FROM %d DEBUG: %d bytes, ", prefix, n.Hash, n.Source, n.Len)
fmt.Println(n.subTypeString())
if n.Len > 0 && len(data) > DebugCaptureLen {
Dissect(dissect, data[DebugCaptureLen:])
}
}
func (n *DebugCapture) subTypeString() string {
switch n.SubType {
case DbgCaptureDelivery:
return fmt.Sprintf("Delivery to ifindex %d", n.Arg1)
case DbgCaptureFromLb:
return fmt.Sprintf("Incoming packet to load balancer on ifindex %d", n.Arg1)
case DbgCaptureAfterV46:
return fmt.Sprintf("Packet after nat46 ifindex %d", n.Arg1)
case DbgCaptureAfterV64:
return fmt.Sprintf("Packet after nat64 ifindex %d", n.Arg1)
case DbgCaptureProxyPre:
return fmt.Sprintf("Packet to proxy port %d (Pre)", byteorder.NetworkToHost(uint16(n.Arg1)))
case DbgCaptureProxyPost:
return fmt.Sprintf("Packet to proxy port %d (Post)", byteorder.NetworkToHost(uint16(n.Arg1)))
default:
return fmt.Sprintf("Unknown message type=%d arg1=%d", n.SubType, n.Arg1)
}
}
func (n *DebugCapture) getJSON(data []byte, cpuPrefix string) (string, error) {
v := DebugCaptureToVerbose(n)
v.CPUPrefix = cpuPrefix
v.Summary = GetConnectionSummary(data[DebugCaptureLen:])
ret, err := json.Marshal(v)
return string(ret), err
}
// DumpJSON prints notification in json format
func (n *DebugCapture) DumpJSON(data []byte, cpuPrefix string) {
resp, err := n.getJSON(data, cpuPrefix)
if err != nil {
fmt.Println(fmt.Sprintf(`{"type":"debug_capture_error","message":%q}`, err.Error()))
return
}
fmt.Println(resp)
}
// DebugCaptureVerbose represents a json notification printed by monitor
type DebugCaptureVerbose struct {
CPUPrefix string `json:"cpu,omitempty"`
Type string `json:"type,omitempty"`
Mark string `json:"mark,omitempty"`
Message string `json:"message,omitempty"`
Prefix string `json:"prefix,omitempty"`
Source uint16 `json:"source"`
Bytes uint32 `json:"bytes"`
Summary string `json:"summary,omitempty"`
}
// DebugCaptureToVerbose creates verbose notification from base TraceNotify
func DebugCaptureToVerbose(n *DebugCapture) DebugCaptureVerbose {
return DebugCaptureVerbose{
Type: "capture",
Mark: fmt.Sprintf("%#x", n.Hash),
Source: n.Source,
Bytes: n.Len,
Message: n.subTypeString(),
Prefix: n.infoPrefix(),
}
}