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debug.go
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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 bpfdebug
import (
"encoding/binary"
"fmt"
"net"
"github.com/cilium/cilium/common"
)
// Must be synchronized with <bpf/lib/common.h>
const (
MessageTypeUnspec = iota
MessageTypeDrop
MessageTypeDebug
MessageTypeCapture
)
// must be in sync with <bpf/lib/dbg.h>
const (
DbgCaptureUnspec = iota
DbgCaptureFromLxc
DbgCaptureFromNetdev
DbgCaptureFromOverlay
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
DbgLb6ReverseNatLookup
DbgLb6ReverseNat
DbgLb4LookupMaster
DbgLb4LookupMasterFail
DbgLb4LookupSlave
DbgLb4LookupSlaveSuccess
DbgLb4ReverseNatLookup
DbgLb4ReverseNat
DbgLb4LoopbackSnat
DbgLb4LoopbackSnatRev
DbgCtLookup4
DbgRRSlaveSel
DbgRevProxyLookup
DbgRevProxyFound
DbgRevProxyUpdate
DbgL4Policy
)
// 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 dropReason(uint8(state))
}
func ctInfo(arg1 uint32, arg2 uint32) string {
return fmt.Sprintf("sport=%d dport=%d nexthdr=%d flags=%d",
arg1>>16, arg1&0xFFFF, arg2>>8, arg2&0xFF)
}
func verdictInfo(arg uint32) string {
proxyPort := common.Swab16(uint16(arg >> 16))
revnat := common.Swab16(uint16(arg & 0xFFFF))
return fmt.Sprintf("proxy_port=%d revnat=%d", proxyPort, revnat)
}
func proxyInfo(arg1 uint32, arg2 uint32) string {
sport := common.Swab16(uint16(arg1 >> 16))
dport := common.Swab16(uint16(arg1 & 0xFFFF))
return fmt.Sprintf("sport=%d dport=%d saddr=%s", sport, dport, ip4Str(arg2))
}
func ip4Str(arg1 uint32) string {
ip := make(net.IP, 4)
binary.LittleEndian.PutUint32(ip, arg1)
return ip.String()
}
// 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
}
// Dump prints the debug message in a human readable format.
func (n *DebugMsg) Dump(data []byte, prefix string) {
fmt.Printf("%s MARK %#x FROM %d DEBUG: ", prefix, n.Hash, n.Source)
switch n.SubType {
case DbgGeneric:
fmt.Printf("No message, arg1=%d (%#x) arg2=%d (%#x)\n", n.Arg1, n.Arg1, n.Arg2, n.Arg2)
case DbgLocalDelivery:
fmt.Printf("Attempting local delivery for container id %d from seclabel %d\n", n.Arg1, n.Arg2)
case DbgEncap:
fmt.Printf("Encapsulating to node %d (%#x) from seclabel %d\n", n.Arg1, n.Arg1, n.Arg2)
case DbgLxcFound:
fmt.Printf("Local container found ifindex %d seclabel %d\n", n.Arg1, common.Swab16(uint16(n.Arg2)))
case DbgPolicyDenied:
fmt.Printf("Policy evaluation would deny packet from %d to %d\n", n.Arg1, n.Arg2)
case DbgCtLookup:
fmt.Printf("CT lookup: %s\n", ctInfo(n.Arg1, n.Arg2))
case DbgCtLookupRev:
fmt.Printf("CT reverse lookup: %s\n", ctInfo(n.Arg1, n.Arg2))
case DbgCtLookup4:
fmt.Printf("CT lookup address: %s\n", ip4Str(n.Arg1))
case DbgCtMatch:
fmt.Printf("CT entry found lifetime=%d, %s\n", n.Arg1,
verdictInfo(n.Arg2))
case DbgCtCreated:
fmt.Printf("CT created 1/2: %s %s\n",
ctInfo(n.Arg1, n.Arg2), verdictInfo(n.Arg3))
case DbgCtCreated2:
fmt.Printf("CT created 2/2: %s revnat=%d\n", ip4Str(n.Arg1), common.Swab16(uint16(n.Arg2)))
case DbgCtVerdict:
fmt.Printf("CT verdict: %s, %s\n",
ctState(n.Arg1), verdictInfo(n.Arg2))
case DbgIcmp6Handle:
fmt.Printf("Handling ICMPv6 type=%d\n", n.Arg1)
case DbgIcmp6Request:
fmt.Printf("ICMPv6 echo request for router offset=%d\n", n.Arg1)
case DbgIcmp6Ns:
fmt.Printf("ICMPv6 neighbour soliciation for address %x:%x\n", n.Arg1, n.Arg2)
case DbgIcmp6TimeExceeded:
fmt.Printf("Sending ICMPv6 time exceeded\n")
case DbgDecap:
fmt.Printf("Tunnel decap: id=%d flowlabel=%x\n", n.Arg1, n.Arg2)
case DbgPortMap:
fmt.Printf("Mapping port from=%d to=%d\n", n.Arg1, n.Arg2)
case DbgErrorRet:
fmt.Printf("BPF function %d returned error %d\n", n.Arg1, n.Arg2)
case DbgToHost:
fmt.Printf("Going to host, policy-skip=%d\n", n.Arg1)
case DbgToStack:
fmt.Printf("Going to the stack, policy-skip=%d\n", n.Arg1)
case DbgPktHash:
fmt.Printf("Packet hash=%d (%#x), selected_service=%d\n", n.Arg1, n.Arg1, n.Arg2)
case DbgRRSlaveSel:
fmt.Printf("RR slave selection hash=%d (%#x), selected_service=%d\n", n.Arg1, n.Arg1, n.Arg2)
case DbgLb6LookupMaster:
fmt.Printf("Master service lookup, addr.p4=%x key.dport=%d\n", n.Arg1, common.Swab16(uint16(n.Arg2)))
case DbgLb6LookupMasterFail:
fmt.Printf("Master service lookup failed, addr.p2=%x addr.p3=%x\n", n.Arg1, n.Arg2)
case DbgLb6LookupSlave, DbgLb4LookupSlave:
fmt.Printf("Slave service lookup: slave=%d, dport=%d\n", n.Arg1, common.Swab16(uint16(n.Arg2)))
case DbgLb6LookupSlaveSuccess:
fmt.Printf("Slave service lookup result: target.p4=%x port=%d\n", n.Arg1, common.Swab16(uint16(n.Arg2)))
case DbgLb6ReverseNatLookup, DbgLb4ReverseNatLookup:
fmt.Printf("Reverse NAT lookup, index=%d\n", common.Swab16(uint16(n.Arg1)))
case DbgLb6ReverseNat:
fmt.Printf("Performing reverse NAT, address.p4=%x port=%d\n", n.Arg1, common.Swab16(uint16(n.Arg2)))
case DbgLb4LookupMaster:
fmt.Printf("Master service lookup, addr=%s key.dport=%d\n", ip4Str(n.Arg1), common.Swab16(uint16(n.Arg2)))
case DbgLb4LookupMasterFail:
fmt.Printf("Master service lookup failed\n")
case DbgLb4LookupSlaveSuccess:
fmt.Printf("Slave service lookup result: target=%s port=%d\n", ip4Str(n.Arg1), common.Swab16(uint16(n.Arg2)))
case DbgLb4ReverseNat:
fmt.Printf("Performing reverse NAT, address=%s port=%d\n", ip4Str(n.Arg1), common.Swab16(uint16(n.Arg2)))
case DbgLb4LoopbackSnat:
fmt.Printf("Loopback SNAT from=%s to=%s\n", ip4Str(n.Arg1), ip4Str(n.Arg2))
case DbgLb4LoopbackSnatRev:
fmt.Printf("Loopback reverse SNAT from=%s to=%s\n", ip4Str(n.Arg1), ip4Str(n.Arg2))
case DbgRevProxyLookup:
fmt.Printf("Reverse proxy lookup %s nexthdr=%d\n",
proxyInfo(n.Arg1, n.Arg2), n.Arg3)
case DbgRevProxyFound:
fmt.Printf("Reverse proxy entry found, orig-daddr=%s orig-dport=%d\n", ip4Str(n.Arg1), n.Arg2)
case DbgRevProxyUpdate:
fmt.Printf("Reverse proxy updated %s nexthdr=%d\n",
proxyInfo(n.Arg1, n.Arg2), n.Arg3)
case DbgL4Policy:
fmt.Printf("Resolved L4 policy to: %d / %s\n",
common.Swab16(uint16(n.Arg1)), ctDirection[int(n.Arg2)])
default:
fmt.Printf("Unknown message type=%d arg1=%d arg2=%d\n", n.SubType, n.Arg1, n.Arg2)
}
}
const (
// DebugCaptureLen is the amount of packet data in a packet capture message
DebugCaptureLen = 20
)
// DebugCapture is the metadata sent along with a captured packet frame
type DebugCapture struct {
Type uint8
SubType uint8
Source uint16
Hash uint32
Len uint32
OrigLen uint32
Arg1 uint32
// data
}
// Dump prints the captured packet in human readable format
func (n *DebugCapture) Dump(dissect bool, data []byte, prefix string) {
fmt.Printf("%s MARK %#x FROM %d DEBUG: %d bytes ", prefix, n.Hash, n.Source, n.Len)
switch n.SubType {
case DbgCaptureFromLxc:
fmt.Printf("Incoming packet from container ifindex %d\n", n.Arg1)
case DbgCaptureFromNetdev:
fmt.Printf("Incoming packet from netdev ifindex %d\n", n.Arg1)
case DbgCaptureFromOverlay:
fmt.Printf("Incoming packet from overlay ifindex %d\n", n.Arg1)
case DbgCaptureDelivery:
fmt.Printf("Delivery to ifindex %d\n", n.Arg1)
case DbgCaptureFromLb:
fmt.Printf("Incoming packet to load balancer on ifindex %d\n", n.Arg1)
case DbgCaptureAfterV46:
fmt.Printf("Packet after nat46 ifindex %d\n", n.Arg1)
case DbgCaptureAfterV64:
fmt.Printf("Packet after nat64 ifindex %d\n", n.Arg1)
case DbgCaptureProxyPre:
fmt.Printf("Packet to proxy port %d (Pre)\n", common.Swab16(uint16(n.Arg1)))
case DbgCaptureProxyPost:
fmt.Printf("Packet to proxy port %d (Post)\n", common.Swab16(uint16(n.Arg1)))
default:
fmt.Printf("Unknown message type=%d arg1=%d\n", n.SubType, n.Arg1)
}
if n.Len > 0 && len(data) > DebugCaptureLen {
Dissect(dissect, data[DebugCaptureLen:])
}
}