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// Copyright 2019 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 header_test
import (
"bytes"
"crypto/sha256"
"fmt"
"testing"
"github.com/google/go-cmp/cmp"
"gvisor.dev/gvisor/pkg/rand"
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/header"
)
const (
linkAddr = tcpip.LinkAddress("\x02\x02\x03\x04\x05\x06")
linkLocalAddr = tcpip.Address("\xfe\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01")
linkLocalMulticastAddr = tcpip.Address("\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01")
uniqueLocalAddr1 = tcpip.Address("\xfc\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01")
uniqueLocalAddr2 = tcpip.Address("\xfd\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02")
globalAddr = tcpip.Address("\xa0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01")
)
func TestEthernetAdddressToModifiedEUI64(t *testing.T) {
expectedIID := [header.IIDSize]byte{0, 2, 3, 255, 254, 4, 5, 6}
if diff := cmp.Diff(expectedIID, header.EthernetAddressToModifiedEUI64(linkAddr)); diff != "" {
t.Errorf("EthernetAddressToModifiedEUI64(%s) mismatch (-want +got):\n%s", linkAddr, diff)
}
var buf [header.IIDSize]byte
header.EthernetAdddressToModifiedEUI64IntoBuf(linkAddr, buf[:])
if diff := cmp.Diff(expectedIID, buf); diff != "" {
t.Errorf("EthernetAddressToModifiedEUI64IntoBuf(%s, _) mismatch (-want +got):\n%s", linkAddr, diff)
}
}
func TestLinkLocalAddr(t *testing.T) {
if got, want := header.LinkLocalAddr(linkAddr), tcpip.Address("\xfe\x80\x00\x00\x00\x00\x00\x00\x00\x02\x03\xff\xfe\x04\x05\x06"); got != want {
t.Errorf("got LinkLocalAddr(%s) = %s, want = %s", linkAddr, got, want)
}
}
func TestAppendOpaqueInterfaceIdentifier(t *testing.T) {
var secretKeyBuf [header.OpaqueIIDSecretKeyMinBytes * 2]byte
if n, err := rand.Read(secretKeyBuf[:]); err != nil {
t.Fatalf("rand.Read(_): %s", err)
} else if want := header.OpaqueIIDSecretKeyMinBytes * 2; n != want {
t.Fatalf("expected rand.Read to read %d bytes, read %d bytes", want, n)
}
tests := []struct {
name string
prefix tcpip.Subnet
nicName string
dadCounter uint8
secretKey []byte
}{
{
name: "SecretKey of minimum size",
prefix: header.IPv6LinkLocalPrefix.Subnet(),
nicName: "eth0",
dadCounter: 0,
secretKey: secretKeyBuf[:header.OpaqueIIDSecretKeyMinBytes],
},
{
name: "SecretKey of less than minimum size",
prefix: func() tcpip.Subnet {
addrWithPrefix := tcpip.AddressWithPrefix{
Address: "\x01\x02\x03\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
PrefixLen: header.IIDOffsetInIPv6Address * 8,
}
return addrWithPrefix.Subnet()
}(),
nicName: "eth10",
dadCounter: 1,
secretKey: secretKeyBuf[:header.OpaqueIIDSecretKeyMinBytes/2],
},
{
name: "SecretKey of more than minimum size",
prefix: func() tcpip.Subnet {
addrWithPrefix := tcpip.AddressWithPrefix{
Address: "\x01\x02\x03\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
PrefixLen: header.IIDOffsetInIPv6Address * 8,
}
return addrWithPrefix.Subnet()
}(),
nicName: "eth11",
dadCounter: 2,
secretKey: secretKeyBuf[:header.OpaqueIIDSecretKeyMinBytes*2],
},
{
name: "Nil SecretKey and empty nicName",
prefix: func() tcpip.Subnet {
addrWithPrefix := tcpip.AddressWithPrefix{
Address: "\x01\x02\x03\x05\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
PrefixLen: header.IIDOffsetInIPv6Address * 8,
}
return addrWithPrefix.Subnet()
}(),
nicName: "",
dadCounter: 3,
secretKey: nil,
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
h := sha256.New()
h.Write([]byte(test.prefix.ID()[:header.IIDOffsetInIPv6Address]))
h.Write([]byte(test.nicName))
h.Write([]byte{test.dadCounter})
if k := test.secretKey; k != nil {
h.Write(k)
}
var hashSum [sha256.Size]byte
h.Sum(hashSum[:0])
want := hashSum[:header.IIDSize]
// Passing a nil buffer should result in a new buffer returned with the
// IID.
if got := header.AppendOpaqueInterfaceIdentifier(nil, test.prefix, test.nicName, test.dadCounter, test.secretKey); !bytes.Equal(got, want) {
t.Errorf("got AppendOpaqueInterfaceIdentifier(nil, %s, %s, %d, %x) = %x, want = %x", test.prefix, test.nicName, test.dadCounter, test.secretKey, got, want)
}
// Passing a buffer with sufficient capacity for the IID should populate
// the buffer provided.
var iidBuf [header.IIDSize]byte
if got := header.AppendOpaqueInterfaceIdentifier(iidBuf[:0], test.prefix, test.nicName, test.dadCounter, test.secretKey); !bytes.Equal(got, want) {
t.Errorf("got AppendOpaqueInterfaceIdentifier(iidBuf[:0], %s, %s, %d, %x) = %x, want = %x", test.prefix, test.nicName, test.dadCounter, test.secretKey, got, want)
}
if got := iidBuf[:]; !bytes.Equal(got, want) {
t.Errorf("got iidBuf = %x, want = %x", got, want)
}
})
}
}
func TestLinkLocalAddrWithOpaqueIID(t *testing.T) {
var secretKeyBuf [header.OpaqueIIDSecretKeyMinBytes * 2]byte
if n, err := rand.Read(secretKeyBuf[:]); err != nil {
t.Fatalf("rand.Read(_): %s", err)
} else if want := header.OpaqueIIDSecretKeyMinBytes * 2; n != want {
t.Fatalf("expected rand.Read to read %d bytes, read %d bytes", want, n)
}
prefix := header.IPv6LinkLocalPrefix.Subnet()
tests := []struct {
name string
prefix tcpip.Subnet
nicName string
dadCounter uint8
secretKey []byte
}{
{
name: "SecretKey of minimum size",
nicName: "eth0",
dadCounter: 0,
secretKey: secretKeyBuf[:header.OpaqueIIDSecretKeyMinBytes],
},
{
name: "SecretKey of less than minimum size",
nicName: "eth10",
dadCounter: 1,
secretKey: secretKeyBuf[:header.OpaqueIIDSecretKeyMinBytes/2],
},
{
name: "SecretKey of more than minimum size",
nicName: "eth11",
dadCounter: 2,
secretKey: secretKeyBuf[:header.OpaqueIIDSecretKeyMinBytes*2],
},
{
name: "Nil SecretKey and empty nicName",
nicName: "",
dadCounter: 3,
secretKey: nil,
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
addrBytes := [header.IPv6AddressSize]byte{
0: 0xFE,
1: 0x80,
}
want := tcpip.Address(header.AppendOpaqueInterfaceIdentifier(
addrBytes[:header.IIDOffsetInIPv6Address],
prefix,
test.nicName,
test.dadCounter,
test.secretKey,
))
if got := header.LinkLocalAddrWithOpaqueIID(test.nicName, test.dadCounter, test.secretKey); got != want {
t.Errorf("got LinkLocalAddrWithOpaqueIID(%s, %d, %x) = %s, want = %s", test.nicName, test.dadCounter, test.secretKey, got, want)
}
})
}
}
func TestIsV6LinkLocalMulticastAddress(t *testing.T) {
tests := []struct {
name string
addr tcpip.Address
expected bool
}{
{
name: "Valid Link Local Multicast",
addr: linkLocalMulticastAddr,
expected: true,
},
{
name: "Valid Link Local Multicast with flags",
addr: "\xff\xf2\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01",
expected: true,
},
{
name: "Link Local Unicast",
addr: linkLocalAddr,
expected: false,
},
{
name: "IPv4 Multicast",
addr: "\xe0\x00\x00\x01",
expected: false,
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
if got := header.IsV6LinkLocalMulticastAddress(test.addr); got != test.expected {
t.Errorf("got header.IsV6LinkLocalMulticastAddress(%s) = %t, want = %t", test.addr, got, test.expected)
}
})
}
}
func TestIsV6LinkLocalAddress(t *testing.T) {
tests := []struct {
name string
addr tcpip.Address
expected bool
}{
{
name: "Valid Link Local Unicast",
addr: linkLocalAddr,
expected: true,
},
{
name: "Link Local Multicast",
addr: linkLocalMulticastAddr,
expected: false,
},
{
name: "Unique Local",
addr: uniqueLocalAddr1,
expected: false,
},
{
name: "Global",
addr: globalAddr,
expected: false,
},
{
name: "IPv4 Link Local",
addr: "\xa9\xfe\x00\x01",
expected: false,
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
if got := header.IsV6LinkLocalAddress(test.addr); got != test.expected {
t.Errorf("got header.IsV6LinkLocalAddress(%s) = %t, want = %t", test.addr, got, test.expected)
}
})
}
}
func TestScopeForIPv6Address(t *testing.T) {
tests := []struct {
name string
addr tcpip.Address
scope header.IPv6AddressScope
err tcpip.Error
}{
{
name: "Unique Local",
addr: uniqueLocalAddr1,
scope: header.GlobalScope,
err: nil,
},
{
name: "Link Local Unicast",
addr: linkLocalAddr,
scope: header.LinkLocalScope,
err: nil,
},
{
name: "Link Local Multicast",
addr: linkLocalMulticastAddr,
scope: header.LinkLocalScope,
err: nil,
},
{
name: "Global",
addr: globalAddr,
scope: header.GlobalScope,
err: nil,
},
{
name: "IPv4",
addr: "\x01\x02\x03\x04",
scope: header.GlobalScope,
err: &tcpip.ErrBadAddress{},
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
got, err := header.ScopeForIPv6Address(test.addr)
if diff := cmp.Diff(test.err, err); diff != "" {
t.Errorf("unexpected error from header.IsV6UniqueLocalAddress(%s), (-want, +got):\n%s", test.addr, diff)
}
if got != test.scope {
t.Errorf("got header.IsV6UniqueLocalAddress(%s) = (%d, _), want = (%d, _)", test.addr, got, test.scope)
}
})
}
}
func TestSolicitedNodeAddr(t *testing.T) {
tests := []struct {
addr tcpip.Address
want tcpip.Address
}{
{
addr: "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\xa0",
want: "\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\xff\x0e\x0f\xa0",
},
{
addr: "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\xdd\x0e\x0f\xa0",
want: "\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\xff\x0e\x0f\xa0",
},
{
addr: "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\xdd\x01\x02\x03",
want: "\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\xff\x01\x02\x03",
},
}
for _, test := range tests {
t.Run(fmt.Sprintf("%s", test.addr), func(t *testing.T) {
if got := header.SolicitedNodeAddr(test.addr); got != test.want {
t.Fatalf("got header.SolicitedNodeAddr(%s) = %s, want = %s", test.addr, got, test.want)
}
})
}
}
|
