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child_to_internal.go
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// Copyright 2020 Anapaya Systems
//
// 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 cases
import (
"hash"
"net"
"net/netip"
"path/filepath"
"time"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/scionproto/scion/pkg/addr"
"github.com/scionproto/scion/pkg/private/util"
"github.com/scionproto/scion/pkg/private/xtest"
"github.com/scionproto/scion/pkg/slayers"
"github.com/scionproto/scion/pkg/slayers/path"
"github.com/scionproto/scion/pkg/slayers/path/scion"
"github.com/scionproto/scion/tools/braccept/runner"
)
// ChildToInternalHost tests traffic from a child to an AS host.
func ChildToInternalHost(artifactsDir string, mac hash.Hash) runner.Case {
options := gopacket.SerializeOptions{
FixLengths: true,
ComputeChecksums: true,
}
// Ethernet: SrcMAC=f0:0d:ca:fe:be:ef DstMAC=f0:0d:ca:fe:00:14 EthernetType=IPv4
ethernet := &layers.Ethernet{
SrcMAC: net.HardwareAddr{0xf0, 0x0d, 0xca, 0xfe, 0xbe, 0xef},
DstMAC: net.HardwareAddr{0xf0, 0x0d, 0xca, 0xfe, 0x00, 0x14},
EthernetType: layers.EthernetTypeIPv4,
}
// IP4: Src=192.168.14.3 Dst=192.168.14.2 NextHdr=UDP Flags=DF
ip := &layers.IPv4{
Version: 4,
IHL: 5,
TTL: 64,
SrcIP: net.IP{192, 168, 14, 3},
DstIP: net.IP{192, 168, 14, 2},
Protocol: layers.IPProtocolUDP,
Flags: layers.IPv4DontFragment,
}
// UDP: Src=40000 Dst=50000
udp := &layers.UDP{
SrcPort: layers.UDPPort(40000),
DstPort: layers.UDPPort(50000),
}
_ = udp.SetNetworkLayerForChecksum(ip)
// SCION: NextHdr=UDP CurrInfoF=4 CurrHopF=6 SrcType=IPv4 DstType=IPv4
// ADDR: SrcIA=1-ff00:0:4 Src=172.16.4.1 DstIA=1-ff00:0:1 Dst=192.168.0.51
// IF_1: ISD=1 Hops=2
// HF_1: ConsIngress=411 ConsEgress=0
// HF_2: ConsIngress=0 ConsEgress=141
// UDP_1: Src=40111 Dst=40222
sp := &scion.Decoded{
Base: scion.Base{
PathMeta: scion.MetaHdr{
CurrHF: 1,
SegLen: [3]uint8{2, 0, 0},
},
NumINF: 1,
NumHops: 2,
},
InfoFields: []path.InfoField{
{SegID: 0x111, Timestamp: util.TimeToSecs(time.Now())},
},
HopFields: []path.HopField{
{ConsIngress: 411, ConsEgress: 0},
{ConsIngress: 0, ConsEgress: 141},
},
}
sp.HopFields[1].Mac = path.MAC(mac, sp.InfoFields[0], sp.HopFields[1], nil)
sp.InfoFields[0].UpdateSegID(sp.HopFields[1].Mac)
scionL := &slayers.SCION{
Version: 0,
TrafficClass: 0xb8,
FlowID: 0xdead,
NextHdr: slayers.L4UDP,
PathType: scion.PathType,
SrcIA: xtest.MustParseIA("1-ff00:0:4"),
DstIA: xtest.MustParseIA("1-ff00:0:1"),
Path: sp,
}
if err := scionL.SetSrcAddr(addr.HostIP(netip.MustParseAddr("172.16.4.1"))); err != nil {
panic(err)
}
if err := scionL.SetDstAddr(addr.HostIP(netip.MustParseAddr("192.168.0.51"))); err != nil {
panic(err)
}
scionudp := &slayers.UDP{}
scionudp.SrcPort = 2345
scionudp.DstPort = 53
scionudp.SetNetworkLayerForChecksum(scionL)
payload := []byte("actualpayloadbytes")
// Prepare input packet
input := gopacket.NewSerializeBuffer()
if err := gopacket.SerializeLayers(input, options,
ethernet, ip, udp, scionL, scionudp, gopacket.Payload(payload),
); err != nil {
panic(err)
}
// Prepare want packet
want := gopacket.NewSerializeBuffer()
// Ethernet: SrcMAC=f0:0d:ca:fe:00:01 DstMAC=f0:0d:ca:fe:be:ef
ethernet.SrcMAC = net.HardwareAddr{0xf0, 0x0d, 0xca, 0xfe, 0x00, 0x1}
ethernet.DstMAC = net.HardwareAddr{0xf0, 0x0d, 0xca, 0xfe, 0xbe, 0xef}
// IP4: Src=192.168.0.11 Dst=192.168.0.51 Checksum=0
ip.SrcIP = net.IP{192, 168, 0, 11}
ip.DstIP = net.IP{192, 168, 0, 51}
// UDP: Src=30001 Dst=30041
udp.SrcPort, udp.DstPort = 30001, 30041
sp.InfoFields[0].UpdateSegID(sp.HopFields[1].Mac)
if err := gopacket.SerializeLayers(want, options,
ethernet, ip, udp, scionL, scionudp, gopacket.Payload(payload),
); err != nil {
panic(err)
}
return runner.Case{
Name: "ChildToInternalHost",
WriteTo: "veth_141_host",
ReadFrom: "veth_int_host",
Input: input.Bytes(),
Want: want.Bytes(),
StoreDir: filepath.Join(artifactsDir, "ChildToInternalHost"),
}
}
// ChildToInternalHostShortcut tests traffic from a child to an AS host with a
// short-cut path. I.e., a path where only a partial path segment is used.
func ChildToInternalHostShortcut(artifactsDir string, mac hash.Hash) runner.Case {
options := gopacket.SerializeOptions{
FixLengths: true,
ComputeChecksums: true,
}
ethernet := &layers.Ethernet{
SrcMAC: net.HardwareAddr{0xf0, 0x0d, 0xca, 0xfe, 0xbe, 0xef},
DstMAC: net.HardwareAddr{0xf0, 0x0d, 0xca, 0xfe, 0x00, 0x14},
EthernetType: layers.EthernetTypeIPv4,
}
ip := &layers.IPv4{
Version: 4,
IHL: 5,
TTL: 64,
SrcIP: net.IP{192, 168, 14, 3},
DstIP: net.IP{192, 168, 14, 2},
Protocol: layers.IPProtocolUDP,
Flags: layers.IPv4DontFragment,
}
udp := &layers.UDP{
SrcPort: layers.UDPPort(40000),
DstPort: layers.UDPPort(50000),
}
_ = udp.SetNetworkLayerForChecksum(ip)
sp := &scion.Decoded{
Base: scion.Base{
PathMeta: scion.MetaHdr{
CurrHF: 1,
SegLen: [3]uint8{2, 0, 0},
},
NumINF: 1,
NumHops: 2,
},
InfoFields: []path.InfoField{
{SegID: 0x111, Timestamp: util.TimeToSecs(time.Now())},
},
HopFields: []path.HopField{
{ConsIngress: 411, ConsEgress: 0},
{ConsIngress: 191, ConsEgress: 141},
},
}
sp.HopFields[1].Mac = path.MAC(mac, sp.InfoFields[0], sp.HopFields[1], nil)
sp.InfoFields[0].UpdateSegID(sp.HopFields[1].Mac)
scionL := &slayers.SCION{
Version: 0,
TrafficClass: 0xb8,
FlowID: 0xdead,
NextHdr: slayers.L4UDP,
PathType: scion.PathType,
SrcIA: xtest.MustParseIA("1-ff00:0:4"),
DstIA: xtest.MustParseIA("1-ff00:0:1"),
Path: sp,
}
if err := scionL.SetSrcAddr(addr.HostIP(netip.MustParseAddr("172.16.4.1"))); err != nil {
panic(err)
}
if err := scionL.SetDstAddr(addr.HostIP(netip.MustParseAddr("192.168.0.51"))); err != nil {
panic(err)
}
scionudp := &slayers.UDP{}
scionudp.SrcPort = 2345
scionudp.DstPort = 53
scionudp.SetNetworkLayerForChecksum(scionL)
payload := []byte("actualpayloadbytes")
// Prepare input packet
input := gopacket.NewSerializeBuffer()
if err := gopacket.SerializeLayers(input, options,
ethernet, ip, udp, scionL, scionudp, gopacket.Payload(payload),
); err != nil {
panic(err)
}
// Prepare want packet
want := gopacket.NewSerializeBuffer()
// Ethernet: SrcMAC=f0:0d:ca:fe:00:01 DstMAC=f0:0d:ca:fe:be:ef
ethernet.SrcMAC = net.HardwareAddr{0xf0, 0x0d, 0xca, 0xfe, 0x00, 0x1}
ethernet.DstMAC = net.HardwareAddr{0xf0, 0x0d, 0xca, 0xfe, 0xbe, 0xef}
// IP4: Src=192.168.0.11 Dst=192.168.0.51 Checksum=0
ip.SrcIP = net.IP{192, 168, 0, 11}
ip.DstIP = net.IP{192, 168, 0, 51}
// UDP: Src=30001 Dst=30041
udp.SrcPort, udp.DstPort = 30001, 30041
sp.InfoFields[0].UpdateSegID(sp.HopFields[1].Mac)
if err := gopacket.SerializeLayers(want, options,
ethernet, ip, udp, scionL, scionudp, gopacket.Payload(payload),
); err != nil {
panic(err)
}
return runner.Case{
Name: "ChildToInternalHostShortcut",
WriteTo: "veth_141_host",
ReadFrom: "veth_int_host",
Input: input.Bytes(),
Want: want.Bytes(),
StoreDir: filepath.Join(artifactsDir, "ChildToInternalHostShortcut"),
}
}
// ChildToInternalParent tests traffic from a child to a parent link that goes
// out from a different BR.
func ChildToInternalParent(artifactsDir string, mac hash.Hash) runner.Case {
options := gopacket.SerializeOptions{
FixLengths: true,
ComputeChecksums: true,
}
// Ethernet: SrcMAC=f0:0d:ca:fe:be:ef DstMAC=f0:0d:ca:fe:00:14 EthernetType=IPv4
ethernet := &layers.Ethernet{
SrcMAC: net.HardwareAddr{0xf0, 0x0d, 0xca, 0xfe, 0xbe, 0xef},
DstMAC: net.HardwareAddr{0xf0, 0x0d, 0xca, 0xfe, 0x00, 0x14},
EthernetType: layers.EthernetTypeIPv4,
}
// IP4: Src=192.168.14.3 Dst=192.168.14.2 NextHdr=UDP Flags=DF
ip := &layers.IPv4{
Version: 4,
IHL: 5,
TTL: 64,
SrcIP: net.IP{192, 168, 14, 3},
DstIP: net.IP{192, 168, 14, 2},
Protocol: layers.IPProtocolUDP,
Flags: layers.IPv4DontFragment,
}
// UDP: Src=40000 Dst=50000
udp := &layers.UDP{
SrcPort: layers.UDPPort(40000),
DstPort: layers.UDPPort(50000),
}
_ = udp.SetNetworkLayerForChecksum(ip)
// SCION: NextHdr=UDP CurrInfoF=4 CurrHopF=6 SrcType=IPv4 DstType=IPv4
// ADDR: SrcIA=1-ff00:0:4 Src=174.16.4.1 DstIA=1-ff00:0:9 Dst=172.16.9.1
// IF_1: ISD=1 Hops=3
// HF_1: ConsIngress=411 ConsEgress=0
// HF_2: ConsIngress=191 ConsEgress=141
// HF_3: ConsIngress=0 ConsEgress=911
// UDP_1: Src=40111 Dst=40222
sp := &scion.Decoded{
Base: scion.Base{
PathMeta: scion.MetaHdr{
CurrHF: 1,
SegLen: [3]uint8{3, 0, 0},
},
NumINF: 1,
NumHops: 3,
},
InfoFields: []path.InfoField{
{SegID: 0x111, Timestamp: util.TimeToSecs(time.Now())},
},
HopFields: []path.HopField{
{ConsIngress: 411, ConsEgress: 0},
{ConsIngress: 191, ConsEgress: 141},
{ConsIngress: 0, ConsEgress: 911},
},
}
sp.HopFields[1].Mac = path.MAC(mac, sp.InfoFields[0], sp.HopFields[1], nil)
sp.InfoFields[0].UpdateSegID(sp.HopFields[1].Mac)
scionL := &slayers.SCION{
Version: 0,
TrafficClass: 0xb8,
FlowID: 0xdead,
NextHdr: slayers.L4UDP,
PathType: scion.PathType,
SrcIA: xtest.MustParseIA("1-ff00:0:4"),
DstIA: xtest.MustParseIA("1-ff00:0:9"),
Path: sp,
}
if err := scionL.SetSrcAddr(addr.HostIP(netip.MustParseAddr("172.16.4.1"))); err != nil {
panic(err)
}
if err := scionL.SetDstAddr(addr.HostIP(netip.MustParseAddr("172.16.9.1"))); err != nil {
panic(err)
}
scionudp := &slayers.UDP{}
scionudp.SrcPort = 2345
scionudp.DstPort = 53
scionudp.SetNetworkLayerForChecksum(scionL)
payload := []byte("actualpayloadbytes")
// Prepare input packet
input := gopacket.NewSerializeBuffer()
if err := gopacket.SerializeLayers(input, options,
ethernet, ip, udp, scionL, scionudp, gopacket.Payload(payload),
); err != nil {
panic(err)
}
// Prepare want packet
want := gopacket.NewSerializeBuffer()
// Ethernet: SrcMAC=f0:0d:ca:fe:00:01 DstMAC=f0:0d:ca:fe:be:ef
ethernet.SrcMAC = net.HardwareAddr{0xf0, 0x0d, 0xca, 0xfe, 0x00, 0x1}
ethernet.DstMAC = net.HardwareAddr{0xf0, 0x0d, 0xca, 0xfe, 0xbe, 0xef}
// IP4: Src=192.168.0.11 Dst=192.168.0.14 Checksum=0
ip.SrcIP = net.IP{192, 168, 0, 11}
ip.DstIP = net.IP{192, 168, 0, 14}
// UDP: Src=30001 Dst=30004
udp.SrcPort, udp.DstPort = 30001, 30004
sp.InfoFields[0].UpdateSegID(sp.HopFields[1].Mac)
if err := gopacket.SerializeLayers(want, options,
ethernet, ip, udp, scionL, scionudp, gopacket.Payload(payload),
); err != nil {
panic(err)
}
return runner.Case{
Name: "ChildToInternalParent",
WriteTo: "veth_141_host",
ReadFrom: "veth_int_host",
Input: input.Bytes(),
Want: want.Bytes(),
StoreDir: filepath.Join(artifactsDir, "ChildToInternalParent"),
}
}