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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 proc
import (
"bytes"
"reflect"
"testing"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/sentry/contexttest"
"gvisor.dev/gvisor/pkg/sentry/inet"
"gvisor.dev/gvisor/pkg/usermem"
)
func newIPv6TestStack() *inet.TestStack {
s := inet.NewTestStack()
s.SupportsIPv6Flag = true
return s
}
func TestIfinet6NoAddresses(t *testing.T) {
n := &ifinet6{stack: newIPv6TestStack()}
var buf bytes.Buffer
n.Generate(contexttest.Context(t), &buf)
if buf.Len() > 0 {
t.Errorf("n.Generate() generated = %v, want = %v", buf.Bytes(), []byte{})
}
}
func TestIfinet6(t *testing.T) {
s := newIPv6TestStack()
s.InterfacesMap[1] = inet.Interface{Name: "eth0"}
s.InterfaceAddrsMap[1] = []inet.InterfaceAddr{
{
Family: linux.AF_INET6,
PrefixLen: 128,
Addr: []byte("\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f"),
},
}
s.InterfacesMap[2] = inet.Interface{Name: "eth1"}
s.InterfaceAddrsMap[2] = []inet.InterfaceAddr{
{
Family: linux.AF_INET6,
PrefixLen: 128,
Addr: []byte("\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"),
},
}
want := map[string]struct{}{
"000102030405060708090a0b0c0d0e0f 01 80 00 00 eth0\n": {},
"101112131415161718191a1b1c1d1e1f 02 80 00 00 eth1\n": {},
}
n := &ifinet6{stack: s}
contents := n.contents()
if len(contents) != len(want) {
t.Errorf("Got len(n.contents()) = %d, want = %d", len(contents), len(want))
}
got := map[string]struct{}{}
for _, l := range contents {
got[l] = struct{}{}
}
if !reflect.DeepEqual(got, want) {
t.Errorf("Got n.contents() = %v, want = %v", got, want)
}
}
// TestIPForwarding tests the implementation of
// /proc/sys/net/ipv4/ip_forwarding
func TestConfigureIPForwarding(t *testing.T) {
ctx := context.Background()
s := inet.NewTestStack()
var cases = []struct {
comment string
initial bool
str string
final bool
}{
{
comment: `Forwarding is disabled; write 1 and enable forwarding`,
initial: false,
str: "1",
final: true,
},
{
comment: `Forwarding is disabled; write 0 and disable forwarding`,
initial: false,
str: "0",
final: false,
},
{
comment: `Forwarding is enabled; write 1 and enable forwarding`,
initial: true,
str: "1",
final: true,
},
{
comment: `Forwarding is enabled; write 0 and disable forwarding`,
initial: true,
str: "0",
final: false,
},
{
comment: `Forwarding is disabled; write 2404 and enable forwarding`,
initial: false,
str: "2404",
final: true,
},
{
comment: `Forwarding is enabled; write 2404 and enable forwarding`,
initial: true,
str: "2404",
final: true,
},
}
for _, c := range cases {
t.Run(c.comment, func(t *testing.T) {
s.IPForwarding = c.initial
file := &ipForwarding{stack: s, enabled: c.initial}
// Write the values.
src := usermem.BytesIOSequence([]byte(c.str))
if n, err := file.Write(ctx, src, 0); n != int64(len(c.str)) || err != nil {
t.Errorf("file.Write(ctx, nil, %q, 0) = (%d, %v); want (%d, nil)", c.str, n, err, len(c.str))
}
// Read the values from the stack and check them.
if got, want := s.IPForwarding, c.final; got != want {
t.Errorf("s.IPForwarding incorrect; got: %v, want: %v", got, want)
}
})
}
}
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