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// Copyright 2018 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 fragmentation
import (
"math"
"reflect"
"testing"
)
type updateHolesInput struct {
first uint16
last uint16
more bool
}
var holesTestCases = []struct {
comment string
in []updateHolesInput
want []hole
}{
{
comment: "No fragments. Expected holes: {[0 -> inf]}.",
in: []updateHolesInput{},
want: []hole{{first: 0, last: math.MaxUint16, deleted: false}},
},
{
comment: "One fragment at beginning. Expected holes: {[2, inf]}.",
in: []updateHolesInput{{first: 0, last: 1, more: true}},
want: []hole{
{first: 0, last: math.MaxUint16, deleted: true},
{first: 2, last: math.MaxUint16, deleted: false},
},
},
{
comment: "One fragment in the middle. Expected holes: {[0, 0], [3, inf]}.",
in: []updateHolesInput{{first: 1, last: 2, more: true}},
want: []hole{
{first: 0, last: math.MaxUint16, deleted: true},
{first: 0, last: 0, deleted: false},
{first: 3, last: math.MaxUint16, deleted: false},
},
},
{
comment: "One fragment at the end. Expected holes: {[0, 0]}.",
in: []updateHolesInput{{first: 1, last: 2, more: false}},
want: []hole{
{first: 0, last: math.MaxUint16, deleted: true},
{first: 0, last: 0, deleted: false},
},
},
{
comment: "One fragment completing a packet. Expected holes: {}.",
in: []updateHolesInput{{first: 0, last: 1, more: false}},
want: []hole{
{first: 0, last: math.MaxUint16, deleted: true},
},
},
{
comment: "Two non-overlapping fragments completing a packet. Expected holes: {}.",
in: []updateHolesInput{
{first: 0, last: 1, more: true},
{first: 2, last: 3, more: false},
},
want: []hole{
{first: 0, last: math.MaxUint16, deleted: true},
{first: 2, last: math.MaxUint16, deleted: true},
},
},
{
comment: "Two overlapping fragments completing a packet. Expected holes: {}.",
in: []updateHolesInput{
{first: 0, last: 2, more: true},
{first: 2, last: 3, more: false},
},
want: []hole{
{first: 0, last: math.MaxUint16, deleted: true},
{first: 3, last: math.MaxUint16, deleted: true},
},
},
}
func TestUpdateHoles(t *testing.T) {
for _, c := range holesTestCases {
r := newReassembler(0)
for _, i := range c.in {
r.updateHoles(i.first, i.last, i.more)
}
if !reflect.DeepEqual(r.holes, c.want) {
t.Errorf("Test \"%s\" produced unexepetced holes. Got %v. Want %v", c.comment, r.holes, c.want)
}
}
}
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