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collection_test.go
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collection_test.go
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package ebpf
import (
"fmt"
"reflect"
"testing"
"github.com/cilium/ebpf/asm"
"github.com/cilium/ebpf/internal/testutils"
)
func TestCollectionSpecNotModified(t *testing.T) {
cs := CollectionSpec{
Maps: map[string]*MapSpec{
"my-map": {
Type: Array,
KeySize: 4,
ValueSize: 4,
MaxEntries: 1,
},
},
Programs: map[string]*ProgramSpec{
"test": {
Type: SocketFilter,
Instructions: asm.Instructions{
asm.LoadImm(asm.R1, 0, asm.DWord),
asm.LoadImm(asm.R0, 0, asm.DWord),
asm.Return(),
},
License: "MIT",
},
},
}
cs.Programs["test"].Instructions[0].Reference = "my-map"
coll, err := NewCollection(&cs)
if err != nil {
t.Fatal(err)
}
coll.Close()
if cs.Programs["test"].Instructions[0].Constant != 0 {
t.Error("Creating a collection modifies input spec")
}
}
func TestCollectionSpecCopy(t *testing.T) {
cs := &CollectionSpec{
Maps: map[string]*MapSpec{
"my-map": {
Type: Array,
KeySize: 4,
ValueSize: 4,
MaxEntries: 1,
},
},
Programs: map[string]*ProgramSpec{
"test": {
Type: SocketFilter,
Instructions: asm.Instructions{
asm.LoadMapPtr(asm.R1, 0),
asm.LoadImm(asm.R0, 0, asm.DWord),
asm.Return(),
},
License: "MIT",
},
},
}
cpy := cs.Copy()
if cpy == cs {
t.Error("Copy returned the same pointner")
}
if cpy.Maps["my-map"] == cs.Maps["my-map"] {
t.Error("Copy returned same Maps")
}
if cpy.Programs["test"] == cs.Programs["test"] {
t.Error("Copy returned same Programs")
}
}
func TestCollectionSpecRewriteMaps(t *testing.T) {
insns := asm.Instructions{
// R1 map
asm.LoadMapPtr(asm.R1, 0),
// R2 key
asm.Mov.Reg(asm.R2, asm.R10),
asm.Add.Imm(asm.R2, -4),
asm.StoreImm(asm.R2, 0, 0, asm.Word),
// Lookup map[0]
asm.FnMapLookupElem.Call(),
asm.JEq.Imm(asm.R0, 0, "ret"),
asm.LoadMem(asm.R0, asm.R0, 0, asm.Word),
asm.Return().Sym("ret"),
}
insns[0].Reference = "test-map"
cs := &CollectionSpec{
Maps: map[string]*MapSpec{
"test-map": {
Type: Array,
KeySize: 4,
ValueSize: 4,
MaxEntries: 1,
},
},
Programs: map[string]*ProgramSpec{
"test-prog": {
Type: SocketFilter,
Instructions: insns,
License: "MIT",
},
},
}
// Override the map with another one
newMap, err := NewMap(cs.Maps["test-map"])
if err != nil {
t.Fatal(err)
}
defer newMap.Close()
err = newMap.Put(uint32(0), uint32(2))
if err != nil {
t.Fatal(err)
}
err = cs.RewriteMaps(map[string]*Map{
"test-map": newMap,
})
if err != nil {
t.Fatal(err)
}
if cs.Maps["test-map"] != nil {
t.Error("RewriteMaps doesn't remove map from CollectionSpec.Maps")
}
coll, err := NewCollection(cs)
if err != nil {
t.Fatal(err)
}
defer coll.Close()
ret, _, err := coll.Programs["test-prog"].Test(make([]byte, 14))
testutils.SkipIfNotSupported(t, err)
if err != nil {
t.Fatal(err)
}
if ret != 2 {
t.Fatal("new / override map not used")
}
}
func TestCollectionSpec_LoadAndAssign_LazyLoading(t *testing.T) {
spec := &CollectionSpec{
Maps: map[string]*MapSpec{
"valid": {
Type: Array,
KeySize: 4,
ValueSize: 4,
MaxEntries: 1,
},
"bogus": {
Type: Array,
MaxEntries: 0,
},
},
Programs: map[string]*ProgramSpec{
"valid": {
Type: SocketFilter,
Instructions: asm.Instructions{
asm.LoadImm(asm.R0, 0, asm.DWord),
asm.Return(),
},
License: "MIT",
},
"bogus": {
Type: SocketFilter,
Instructions: asm.Instructions{
// Undefined return value is rejected
asm.Return(),
},
License: "MIT",
},
},
}
var objs struct {
Prog *Program `ebpf:"valid"`
Map *Map `ebpf:"valid"`
}
if err := spec.LoadAndAssign(&objs, nil); err != nil {
t.Fatal("Assign loads a map or program that isn't requested in the struct:", err)
}
if objs.Prog == nil {
t.Error("Program is nil")
}
if objs.Map == nil {
t.Error("Map is nil")
}
}
func TestCollectionAssign(t *testing.T) {
var specs struct {
Program *ProgramSpec `ebpf:"prog1"`
Map *MapSpec `ebpf:"map1"`
}
mapSpec := &MapSpec{
Type: Array,
KeySize: 4,
ValueSize: 4,
MaxEntries: 1,
}
progSpec := &ProgramSpec{
Type: SocketFilter,
Instructions: asm.Instructions{
asm.LoadImm(asm.R0, 0, asm.DWord),
asm.Return(),
},
License: "MIT",
}
cs := &CollectionSpec{
Maps: map[string]*MapSpec{
"map1": mapSpec,
},
Programs: map[string]*ProgramSpec{
"prog1": progSpec,
},
}
if err := cs.Assign(&specs); err != nil {
t.Fatal("Can't assign spec:", err)
}
if specs.Program != progSpec {
t.Fatalf("Expected Program to be %p, got %p", progSpec, specs.Program)
}
if specs.Map != mapSpec {
t.Fatalf("Expected Map to be %p, got %p", mapSpec, specs.Map)
}
if err := cs.Assign(new(int)); err == nil {
t.Fatal("Assign allows to besides *struct")
}
if err := cs.Assign(new(struct{ Foo int })); err != nil {
t.Fatal("Assign doesn't ignore untagged fields")
}
unexported := new(struct {
foo *MapSpec `ebpf:"map1"`
})
if err := cs.Assign(unexported); err == nil {
t.Error("Assign should return an error on unexported fields")
}
}
func TestAssignValues(t *testing.T) {
zero := func(t reflect.Type, name string) (interface{}, error) {
return reflect.Zero(t).Interface(), nil
}
type t1 struct {
Bar int `ebpf:"bar"`
}
type t2 struct {
t1
Foo int `ebpf:"foo"`
}
type t2ptr struct {
*t1
Foo int `ebpf:"foo"`
}
invalid := []struct {
name string
to interface{}
}{
{"non-struct", 1},
{"non-pointer struct", t1{}},
{"pointer to non-struct", new(int)},
{"embedded nil pointer", &t2ptr{}},
{"unexported field", new(struct {
foo int `ebpf:"foo"`
})},
{"identical tag", new(struct {
Foo1 int `ebpf:"foo"`
Foo2 int `ebpf:"foo"`
})},
}
for _, testcase := range invalid {
t.Run(testcase.name, func(t *testing.T) {
if err := assignValues(testcase.to, zero); err == nil {
t.Fatal("assignValues didn't return an error")
} else {
t.Log(err)
}
})
}
valid := []struct {
name string
to interface{}
}{
{"pointer to struct", new(t1)},
{"embedded struct", new(t2)},
{"embedded struct pointer", &t2ptr{t1: new(t1)}},
{"untagged field", new(struct{ Foo int })},
}
for _, testcase := range valid {
t.Run(testcase.name, func(t *testing.T) {
if err := assignValues(testcase.to, zero); err != nil {
t.Fatal("assignValues returned", err)
}
})
}
}
func ExampleCollectionSpec_Assign() {
spec := &CollectionSpec{
Maps: map[string]*MapSpec{
"map1": {
Type: Array,
KeySize: 4,
ValueSize: 4,
MaxEntries: 1,
},
},
Programs: map[string]*ProgramSpec{
"prog1": {
Type: SocketFilter,
Instructions: asm.Instructions{
asm.LoadImm(asm.R0, 0, asm.DWord),
asm.Return(),
},
License: "MIT",
},
},
}
type maps struct {
Map *MapSpec `ebpf:"map1"`
}
var specs struct {
maps
Program *ProgramSpec `ebpf:"prog1"`
}
if err := spec.Assign(&specs); err != nil {
panic(err)
}
fmt.Println(specs.Program.Type)
fmt.Println(specs.Map.Type)
// Output: SocketFilter
// Array
}
func ExampleCollectionSpec_LoadAndAssign() {
spec := &CollectionSpec{
Maps: map[string]*MapSpec{
"map1": {
Type: Array,
KeySize: 4,
ValueSize: 4,
MaxEntries: 1,
},
},
Programs: map[string]*ProgramSpec{
"prog1": {
Type: SocketFilter,
Instructions: asm.Instructions{
asm.LoadImm(asm.R0, 0, asm.DWord),
asm.Return(),
},
License: "MIT",
},
},
}
var objs struct {
Program *Program `ebpf:"prog1"`
Map *Map `ebpf:"map1"`
}
if err := spec.LoadAndAssign(&objs, nil); err != nil {
panic(err)
}
fmt.Println(objs.Program.Type())
fmt.Println(objs.Map.Type())
// Output: SocketFilter
// Array
}