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Diffstat (limited to 'test/packetimpact/testbench/layers.go')
-rw-r--r--test/packetimpact/testbench/layers.go658
1 files changed, 0 insertions, 658 deletions
diff --git a/test/packetimpact/testbench/layers.go b/test/packetimpact/testbench/layers.go
deleted file mode 100644
index 4d6625941..000000000
--- a/test/packetimpact/testbench/layers.go
+++ /dev/null
@@ -1,658 +0,0 @@
-// Copyright 2020 The gVisor Authors.
-//
-// 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 testbench
-
-import (
- "fmt"
- "reflect"
- "strings"
-
- "github.com/google/go-cmp/cmp"
- "github.com/google/go-cmp/cmp/cmpopts"
- "github.com/imdario/mergo"
- "gvisor.dev/gvisor/pkg/tcpip"
- "gvisor.dev/gvisor/pkg/tcpip/buffer"
- "gvisor.dev/gvisor/pkg/tcpip/header"
-)
-
-// Layer is the interface that all encapsulations must implement.
-//
-// A Layer is an encapsulation in a packet, such as TCP, IPv4, IPv6, etc. A
-// Layer contains all the fields of the encapsulation. Each field is a pointer
-// and may be nil.
-type Layer interface {
- fmt.Stringer
-
- // toBytes converts the Layer into bytes. In places where the Layer's field
- // isn't nil, the value that is pointed to is used. When the field is nil, a
- // reasonable default for the Layer is used. For example, "64" for IPv4 TTL
- // and a calculated checksum for TCP or IP. Some layers require information
- // from the previous or next layers in order to compute a default, such as
- // TCP's checksum or Ethernet's type, so each Layer has a doubly-linked list
- // to the layer's neighbors.
- toBytes() ([]byte, error)
-
- // match checks if the current Layer matches the provided Layer. If either
- // Layer has a nil in a given field, that field is considered matching.
- // Otherwise, the values pointed to by the fields must match. The LayerBase is
- // ignored.
- match(Layer) bool
-
- // length in bytes of the current encapsulation
- length() int
-
- // next gets a pointer to the encapsulated Layer.
- next() Layer
-
- // prev gets a pointer to the Layer encapsulating this one.
- prev() Layer
-
- // setNext sets the pointer to the encapsulated Layer.
- setNext(Layer)
-
- // setPrev sets the pointer to the Layer encapsulating this one.
- setPrev(Layer)
-}
-
-// LayerBase is the common elements of all layers.
-type LayerBase struct {
- nextLayer Layer
- prevLayer Layer
-}
-
-func (lb *LayerBase) next() Layer {
- return lb.nextLayer
-}
-
-func (lb *LayerBase) prev() Layer {
- return lb.prevLayer
-}
-
-func (lb *LayerBase) setNext(l Layer) {
- lb.nextLayer = l
-}
-
-func (lb *LayerBase) setPrev(l Layer) {
- lb.prevLayer = l
-}
-
-// equalLayer compares that two Layer structs match while ignoring field in
-// which either input has a nil and also ignoring the LayerBase of the inputs.
-func equalLayer(x, y Layer) bool {
- // opt ignores comparison pairs where either of the inputs is a nil.
- opt := cmp.FilterValues(func(x, y interface{}) bool {
- for _, l := range []interface{}{x, y} {
- v := reflect.ValueOf(l)
- if (v.Kind() == reflect.Ptr || v.Kind() == reflect.Slice) && v.IsNil() {
- return true
- }
- }
- return false
- }, cmp.Ignore())
- return cmp.Equal(x, y, opt, cmpopts.IgnoreTypes(LayerBase{}))
-}
-
-func stringLayer(l Layer) string {
- v := reflect.ValueOf(l).Elem()
- t := v.Type()
- var ret []string
- for i := 0; i < v.NumField(); i++ {
- t := t.Field(i)
- if t.Anonymous {
- // Ignore the LayerBase in the Layer struct.
- continue
- }
- v := v.Field(i)
- if v.IsNil() {
- continue
- }
- ret = append(ret, fmt.Sprintf("%s:%v", t.Name, v))
- }
- return fmt.Sprintf("&%s{%s}", t, strings.Join(ret, " "))
-}
-
-// Ether can construct and match an ethernet encapsulation.
-type Ether struct {
- LayerBase
- SrcAddr *tcpip.LinkAddress
- DstAddr *tcpip.LinkAddress
- Type *tcpip.NetworkProtocolNumber
-}
-
-func (l *Ether) String() string {
- return stringLayer(l)
-}
-
-func (l *Ether) toBytes() ([]byte, error) {
- b := make([]byte, header.EthernetMinimumSize)
- h := header.Ethernet(b)
- fields := &header.EthernetFields{}
- if l.SrcAddr != nil {
- fields.SrcAddr = *l.SrcAddr
- }
- if l.DstAddr != nil {
- fields.DstAddr = *l.DstAddr
- }
- if l.Type != nil {
- fields.Type = *l.Type
- } else {
- switch n := l.next().(type) {
- case *IPv4:
- fields.Type = header.IPv4ProtocolNumber
- default:
- // TODO(b/150301488): Support more protocols, like IPv6.
- return nil, fmt.Errorf("can't deduce the ethernet header's next protocol: %d", n)
- }
- }
- h.Encode(fields)
- return h, nil
-}
-
-// LinkAddress is a helper routine that allocates a new tcpip.LinkAddress value
-// to store v and returns a pointer to it.
-func LinkAddress(v tcpip.LinkAddress) *tcpip.LinkAddress {
- return &v
-}
-
-// NetworkProtocolNumber is a helper routine that allocates a new
-// tcpip.NetworkProtocolNumber value to store v and returns a pointer to it.
-func NetworkProtocolNumber(v tcpip.NetworkProtocolNumber) *tcpip.NetworkProtocolNumber {
- return &v
-}
-
-// ParseEther parses the bytes assuming that they start with an ethernet header
-// and continues parsing further encapsulations.
-func ParseEther(b []byte) (Layers, error) {
- h := header.Ethernet(b)
- ether := Ether{
- SrcAddr: LinkAddress(h.SourceAddress()),
- DstAddr: LinkAddress(h.DestinationAddress()),
- Type: NetworkProtocolNumber(h.Type()),
- }
- layers := Layers{&ether}
- switch h.Type() {
- case header.IPv4ProtocolNumber:
- moreLayers, err := ParseIPv4(b[ether.length():])
- if err != nil {
- return nil, err
- }
- return append(layers, moreLayers...), nil
- default:
- // TODO(b/150301488): Support more protocols, like IPv6.
- return nil, fmt.Errorf("can't deduce the ethernet header's next protocol: %#v", b)
- }
-}
-
-func (l *Ether) match(other Layer) bool {
- return equalLayer(l, other)
-}
-
-func (l *Ether) length() int {
- return header.EthernetMinimumSize
-}
-
-// IPv4 can construct and match an IPv4 encapsulation.
-type IPv4 struct {
- LayerBase
- IHL *uint8
- TOS *uint8
- TotalLength *uint16
- ID *uint16
- Flags *uint8
- FragmentOffset *uint16
- TTL *uint8
- Protocol *uint8
- Checksum *uint16
- SrcAddr *tcpip.Address
- DstAddr *tcpip.Address
-}
-
-func (l *IPv4) String() string {
- return stringLayer(l)
-}
-
-func (l *IPv4) toBytes() ([]byte, error) {
- b := make([]byte, header.IPv4MinimumSize)
- h := header.IPv4(b)
- fields := &header.IPv4Fields{
- IHL: 20,
- TOS: 0,
- TotalLength: 0,
- ID: 0,
- Flags: 0,
- FragmentOffset: 0,
- TTL: 64,
- Protocol: 0,
- Checksum: 0,
- SrcAddr: tcpip.Address(""),
- DstAddr: tcpip.Address(""),
- }
- if l.TOS != nil {
- fields.TOS = *l.TOS
- }
- if l.TotalLength != nil {
- fields.TotalLength = *l.TotalLength
- } else {
- fields.TotalLength = uint16(l.length())
- current := l.next()
- for current != nil {
- fields.TotalLength += uint16(current.length())
- current = current.next()
- }
- }
- if l.ID != nil {
- fields.ID = *l.ID
- }
- if l.Flags != nil {
- fields.Flags = *l.Flags
- }
- if l.FragmentOffset != nil {
- fields.FragmentOffset = *l.FragmentOffset
- }
- if l.TTL != nil {
- fields.TTL = *l.TTL
- }
- if l.Protocol != nil {
- fields.Protocol = *l.Protocol
- } else {
- switch n := l.next().(type) {
- case *TCP:
- fields.Protocol = uint8(header.TCPProtocolNumber)
- case *UDP:
- fields.Protocol = uint8(header.UDPProtocolNumber)
- default:
- // TODO(b/150301488): Support more protocols as needed.
- return nil, fmt.Errorf("can't deduce the ip header's next protocol: %#v", n)
- }
- }
- if l.SrcAddr != nil {
- fields.SrcAddr = *l.SrcAddr
- }
- if l.DstAddr != nil {
- fields.DstAddr = *l.DstAddr
- }
- if l.Checksum != nil {
- fields.Checksum = *l.Checksum
- }
- h.Encode(fields)
- if l.Checksum == nil {
- h.SetChecksum(^h.CalculateChecksum())
- }
- return h, nil
-}
-
-// Uint16 is a helper routine that allocates a new
-// uint16 value to store v and returns a pointer to it.
-func Uint16(v uint16) *uint16 {
- return &v
-}
-
-// Uint8 is a helper routine that allocates a new
-// uint8 value to store v and returns a pointer to it.
-func Uint8(v uint8) *uint8 {
- return &v
-}
-
-// Address is a helper routine that allocates a new tcpip.Address value to store
-// v and returns a pointer to it.
-func Address(v tcpip.Address) *tcpip.Address {
- return &v
-}
-
-// ParseIPv4 parses the bytes assuming that they start with an ipv4 header and
-// continues parsing further encapsulations.
-func ParseIPv4(b []byte) (Layers, error) {
- h := header.IPv4(b)
- tos, _ := h.TOS()
- ipv4 := IPv4{
- IHL: Uint8(h.HeaderLength()),
- TOS: &tos,
- TotalLength: Uint16(h.TotalLength()),
- ID: Uint16(h.ID()),
- Flags: Uint8(h.Flags()),
- FragmentOffset: Uint16(h.FragmentOffset()),
- TTL: Uint8(h.TTL()),
- Protocol: Uint8(h.Protocol()),
- Checksum: Uint16(h.Checksum()),
- SrcAddr: Address(h.SourceAddress()),
- DstAddr: Address(h.DestinationAddress()),
- }
- layers := Layers{&ipv4}
- switch h.TransportProtocol() {
- case header.TCPProtocolNumber:
- moreLayers, err := ParseTCP(b[ipv4.length():])
- if err != nil {
- return nil, err
- }
- return append(layers, moreLayers...), nil
- case header.UDPProtocolNumber:
- moreLayers, err := ParseUDP(b[ipv4.length():])
- if err != nil {
- return nil, err
- }
- return append(layers, moreLayers...), nil
- }
- return nil, fmt.Errorf("can't deduce the ethernet header's next protocol: %d", h.Protocol())
-}
-
-func (l *IPv4) match(other Layer) bool {
- return equalLayer(l, other)
-}
-
-func (l *IPv4) length() int {
- if l.IHL == nil {
- return header.IPv4MinimumSize
- }
- return int(*l.IHL)
-}
-
-// TCP can construct and match a TCP encapsulation.
-type TCP struct {
- LayerBase
- SrcPort *uint16
- DstPort *uint16
- SeqNum *uint32
- AckNum *uint32
- DataOffset *uint8
- Flags *uint8
- WindowSize *uint16
- Checksum *uint16
- UrgentPointer *uint16
-}
-
-func (l *TCP) String() string {
- return stringLayer(l)
-}
-
-func (l *TCP) toBytes() ([]byte, error) {
- b := make([]byte, header.TCPMinimumSize)
- h := header.TCP(b)
- if l.SrcPort != nil {
- h.SetSourcePort(*l.SrcPort)
- }
- if l.DstPort != nil {
- h.SetDestinationPort(*l.DstPort)
- }
- if l.SeqNum != nil {
- h.SetSequenceNumber(*l.SeqNum)
- }
- if l.AckNum != nil {
- h.SetAckNumber(*l.AckNum)
- }
- if l.DataOffset != nil {
- h.SetDataOffset(*l.DataOffset)
- } else {
- h.SetDataOffset(uint8(l.length()))
- }
- if l.Flags != nil {
- h.SetFlags(*l.Flags)
- }
- if l.WindowSize != nil {
- h.SetWindowSize(*l.WindowSize)
- } else {
- h.SetWindowSize(32768)
- }
- if l.UrgentPointer != nil {
- h.SetUrgentPoiner(*l.UrgentPointer)
- }
- if l.Checksum != nil {
- h.SetChecksum(*l.Checksum)
- return h, nil
- }
- if err := setTCPChecksum(&h, l); err != nil {
- return nil, err
- }
- return h, nil
-}
-
-// totalLength returns the length of the provided layer and all following
-// layers.
-func totalLength(l Layer) int {
- var totalLength int
- for ; l != nil; l = l.next() {
- totalLength += l.length()
- }
- return totalLength
-}
-
-// layerChecksum calculates the checksum of the Layer header, including the
-// peusdeochecksum of the layer before it and all the bytes after it..
-func layerChecksum(l Layer, protoNumber tcpip.TransportProtocolNumber) (uint16, error) {
- totalLength := uint16(totalLength(l))
- var xsum uint16
- switch s := l.prev().(type) {
- case *IPv4:
- xsum = header.PseudoHeaderChecksum(protoNumber, *s.SrcAddr, *s.DstAddr, totalLength)
- default:
- // TODO(b/150301488): Support more protocols, like IPv6.
- return 0, fmt.Errorf("can't get src and dst addr from previous layer: %#v", s)
- }
- var payloadBytes buffer.VectorisedView
- for current := l.next(); current != nil; current = current.next() {
- payload, err := current.toBytes()
- if err != nil {
- return 0, fmt.Errorf("can't get bytes for next header: %s", payload)
- }
- payloadBytes.AppendView(payload)
- }
- xsum = header.ChecksumVV(payloadBytes, xsum)
- return xsum, nil
-}
-
-// setTCPChecksum calculates the checksum of the TCP header and sets it in h.
-func setTCPChecksum(h *header.TCP, tcp *TCP) error {
- h.SetChecksum(0)
- xsum, err := layerChecksum(tcp, header.TCPProtocolNumber)
- if err != nil {
- return err
- }
- h.SetChecksum(^h.CalculateChecksum(xsum))
- return nil
-}
-
-// Uint32 is a helper routine that allocates a new
-// uint32 value to store v and returns a pointer to it.
-func Uint32(v uint32) *uint32 {
- return &v
-}
-
-// ParseTCP parses the bytes assuming that they start with a tcp header and
-// continues parsing further encapsulations.
-func ParseTCP(b []byte) (Layers, error) {
- h := header.TCP(b)
- tcp := TCP{
- SrcPort: Uint16(h.SourcePort()),
- DstPort: Uint16(h.DestinationPort()),
- SeqNum: Uint32(h.SequenceNumber()),
- AckNum: Uint32(h.AckNumber()),
- DataOffset: Uint8(h.DataOffset()),
- Flags: Uint8(h.Flags()),
- WindowSize: Uint16(h.WindowSize()),
- Checksum: Uint16(h.Checksum()),
- UrgentPointer: Uint16(h.UrgentPointer()),
- }
- layers := Layers{&tcp}
- moreLayers, err := ParsePayload(b[tcp.length():])
- if err != nil {
- return nil, err
- }
- return append(layers, moreLayers...), nil
-}
-
-func (l *TCP) match(other Layer) bool {
- return equalLayer(l, other)
-}
-
-func (l *TCP) length() int {
- if l.DataOffset == nil {
- return header.TCPMinimumSize
- }
- return int(*l.DataOffset)
-}
-
-// merge overrides the values in l with the values from other but only in fields
-// where the value is not nil.
-func (l *TCP) merge(other TCP) error {
- return mergo.Merge(l, other, mergo.WithOverride)
-}
-
-// UDP can construct and match a UDP encapsulation.
-type UDP struct {
- LayerBase
- SrcPort *uint16
- DstPort *uint16
- Length *uint16
- Checksum *uint16
-}
-
-func (l *UDP) String() string {
- return stringLayer(l)
-}
-
-func (l *UDP) toBytes() ([]byte, error) {
- b := make([]byte, header.UDPMinimumSize)
- h := header.UDP(b)
- if l.SrcPort != nil {
- h.SetSourcePort(*l.SrcPort)
- }
- if l.DstPort != nil {
- h.SetDestinationPort(*l.DstPort)
- }
- if l.Length != nil {
- h.SetLength(*l.Length)
- } else {
- h.SetLength(uint16(totalLength(l)))
- }
- if l.Checksum != nil {
- h.SetChecksum(*l.Checksum)
- return h, nil
- }
- if err := setUDPChecksum(&h, l); err != nil {
- return nil, err
- }
- return h, nil
-}
-
-// setUDPChecksum calculates the checksum of the UDP header and sets it in h.
-func setUDPChecksum(h *header.UDP, udp *UDP) error {
- h.SetChecksum(0)
- xsum, err := layerChecksum(udp, header.UDPProtocolNumber)
- if err != nil {
- return err
- }
- h.SetChecksum(^h.CalculateChecksum(xsum))
- return nil
-}
-
-// ParseUDP parses the bytes assuming that they start with a udp header and
-// continues parsing further encapsulations.
-func ParseUDP(b []byte) (Layers, error) {
- h := header.UDP(b)
- udp := UDP{
- SrcPort: Uint16(h.SourcePort()),
- DstPort: Uint16(h.DestinationPort()),
- Length: Uint16(h.Length()),
- Checksum: Uint16(h.Checksum()),
- }
- layers := Layers{&udp}
- moreLayers, err := ParsePayload(b[udp.length():])
- if err != nil {
- return nil, err
- }
- return append(layers, moreLayers...), nil
-}
-
-func (l *UDP) match(other Layer) bool {
- return equalLayer(l, other)
-}
-
-func (l *UDP) length() int {
- if l.Length == nil {
- return header.UDPMinimumSize
- }
- return int(*l.Length)
-}
-
-// merge overrides the values in l with the values from other but only in fields
-// where the value is not nil.
-func (l *UDP) merge(other UDP) error {
- return mergo.Merge(l, other, mergo.WithOverride)
-}
-
-// Payload has bytes beyond OSI layer 4.
-type Payload struct {
- LayerBase
- Bytes []byte
-}
-
-func (l *Payload) String() string {
- return stringLayer(l)
-}
-
-// ParsePayload parses the bytes assuming that they start with a payload and
-// continue to the end. There can be no further encapsulations.
-func ParsePayload(b []byte) (Layers, error) {
- payload := Payload{
- Bytes: b,
- }
- return Layers{&payload}, nil
-}
-
-func (l *Payload) toBytes() ([]byte, error) {
- return l.Bytes, nil
-}
-
-func (l *Payload) match(other Layer) bool {
- return equalLayer(l, other)
-}
-
-func (l *Payload) length() int {
- return len(l.Bytes)
-}
-
-// Layers is an array of Layer and supports similar functions to Layer.
-type Layers []Layer
-
-func (ls *Layers) toBytes() ([]byte, error) {
- for i, l := range *ls {
- if i > 0 {
- l.setPrev((*ls)[i-1])
- }
- if i+1 < len(*ls) {
- l.setNext((*ls)[i+1])
- }
- }
- outBytes := []byte{}
- for _, l := range *ls {
- layerBytes, err := l.toBytes()
- if err != nil {
- return nil, err
- }
- outBytes = append(outBytes, layerBytes...)
- }
- return outBytes, nil
-}
-
-func (ls *Layers) match(other Layers) bool {
- if len(*ls) > len(other) {
- return false
- }
- for i := 0; i < len(*ls); i++ {
- if !equalLayer((*ls)[i], other[i]) {
- return false
- }
- }
- return true
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-01 12:07:22 +0000