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367 lines (312 loc) · 8.71 KB
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package ebpf
import (
"errors"
"fmt"
"os"
"strings"
"testing"
"github.com/cilium/ebpf/asm"
"github.com/cilium/ebpf/internal"
"github.com/cilium/ebpf/internal/sys"
"github.com/cilium/ebpf/internal/testutils"
"github.com/cilium/ebpf/internal/unix"
qt "github.com/frankban/quicktest"
)
func TestMapInfoFromProc(t *testing.T) {
hash, err := NewMap(&MapSpec{
Name: "testing",
Type: Hash,
KeySize: 4,
ValueSize: 5,
MaxEntries: 2,
Flags: unix.BPF_F_NO_PREALLOC,
})
testutils.SkipIfNotSupported(t, err)
if err != nil {
t.Fatal(err)
}
defer hash.Close()
info, err := newMapInfoFromProc(hash.fd)
testutils.SkipIfNotSupported(t, err)
if err != nil {
t.Fatal("Can't get map info:", err)
}
if info.Type != Hash {
t.Error("Expected Hash, got", info.Type)
}
if info.KeySize != 4 {
t.Error("Expected KeySize of 4, got", info.KeySize)
}
if info.ValueSize != 5 {
t.Error("Expected ValueSize of 5, got", info.ValueSize)
}
if info.MaxEntries != 2 {
t.Error("Expected MaxEntries of 2, got", info.MaxEntries)
}
if info.Flags != unix.BPF_F_NO_PREALLOC {
t.Errorf("Expected Flags to be %d, got %d", unix.BPF_F_NO_PREALLOC, info.Flags)
}
if info.Name != "" && info.Name != "testing" {
t.Error("Expected name to be testing, got", info.Name)
}
if _, ok := info.ID(); ok {
t.Error("Expected ID to not be available")
}
nested, err := NewMap(&MapSpec{
Type: ArrayOfMaps,
KeySize: 4,
MaxEntries: 2,
InnerMap: &MapSpec{
Type: Array,
KeySize: 4,
ValueSize: 4,
MaxEntries: 2,
},
})
testutils.SkipIfNotSupported(t, err)
if err != nil {
t.Fatal(err)
}
defer nested.Close()
_, err = newMapInfoFromProc(nested.fd)
if err != nil {
t.Fatal("Can't get nested map info from /proc:", err)
}
}
func TestProgramInfo(t *testing.T) {
prog := mustSocketFilter(t)
for name, fn := range map[string]func(*sys.FD) (*ProgramInfo, error){
"generic": newProgramInfoFromFd,
"proc": newProgramInfoFromProc,
} {
t.Run(name, func(t *testing.T) {
info, err := fn(prog.fd)
testutils.SkipIfNotSupported(t, err)
if err != nil {
t.Fatal("Can't get program info:", err)
}
if info.Type != SocketFilter {
t.Error("Expected Type to be SocketFilter, got", info.Type)
}
if info.Name != "" && info.Name != "test" {
t.Error("Expected Name to be test, got", info.Name)
}
if want := "d7edec644f05498d"; info.Tag != want {
t.Errorf("Expected Tag to be %s, got %s", want, info.Tag)
}
if id, ok := info.ID(); ok && id == 0 {
t.Error("Expected a valid ID:", id)
} else if name == "proc" && ok {
t.Error("Expected ID to not be available")
}
if name == "proc" {
_, ok := info.CreatedByUID()
qt.Assert(t, ok, qt.IsFalse)
} else {
uid, ok := info.CreatedByUID()
if testutils.IsKernelLessThan(t, "4.15") {
qt.Assert(t, ok, qt.IsFalse)
} else {
qt.Assert(t, ok, qt.IsTrue)
qt.Assert(t, uid, qt.Equals, uint32(os.Getuid()))
}
}
})
}
}
func TestProgramInfoMapIDs(t *testing.T) {
arr, err := NewMap(&MapSpec{
Type: Array,
KeySize: 4,
ValueSize: 4,
MaxEntries: 1,
})
qt.Assert(t, err, qt.IsNil)
defer arr.Close()
prog, err := NewProgram(&ProgramSpec{
Type: SocketFilter,
Instructions: asm.Instructions{
asm.LoadMapPtr(asm.R0, arr.FD()),
asm.LoadImm(asm.R0, 2, asm.DWord),
asm.Return(),
},
License: "MIT",
})
qt.Assert(t, err, qt.IsNil)
defer prog.Close()
info, err := prog.Info()
testutils.SkipIfNotSupported(t, err)
qt.Assert(t, err, qt.IsNil)
ids, ok := info.MapIDs()
switch {
case testutils.IsKernelLessThan(t, "4.15"):
qt.Assert(t, ok, qt.IsFalse)
qt.Assert(t, ids, qt.HasLen, 0)
default:
qt.Assert(t, ok, qt.IsTrue)
mapInfo, err := arr.Info()
qt.Assert(t, err, qt.IsNil)
mapID, ok := mapInfo.ID()
qt.Assert(t, ok, qt.IsTrue)
qt.Assert(t, ids, qt.ContentEquals, []MapID{mapID})
}
}
func TestProgramInfoMapIDsNoMaps(t *testing.T) {
prog, err := NewProgram(&ProgramSpec{
Type: SocketFilter,
Instructions: asm.Instructions{
asm.LoadImm(asm.R0, 0, asm.DWord),
asm.Return(),
},
License: "MIT",
})
qt.Assert(t, err, qt.IsNil)
defer prog.Close()
info, err := prog.Info()
testutils.SkipIfNotSupported(t, err)
qt.Assert(t, err, qt.IsNil)
ids, ok := info.MapIDs()
switch {
case testutils.IsKernelLessThan(t, "4.15"):
qt.Assert(t, ok, qt.IsFalse)
qt.Assert(t, ids, qt.HasLen, 0)
default:
qt.Assert(t, ok, qt.IsTrue)
qt.Assert(t, ids, qt.HasLen, 0)
}
}
func TestScanFdInfoReader(t *testing.T) {
tests := []struct {
fields map[string]interface{}
valid bool
}{
{nil, true},
{map[string]interface{}{"foo": new(string)}, true},
{map[string]interface{}{"zap": new(string)}, false},
{map[string]interface{}{"foo": new(int)}, false},
}
for _, test := range tests {
err := scanFdInfoReader(strings.NewReader("foo:\tbar\n"), test.fields)
if test.valid {
if err != nil {
t.Errorf("fields %v returns an error: %s", test.fields, err)
}
} else {
if err == nil {
t.Errorf("fields %v doesn't r
8000
eturn an error", test.fields)
}
}
}
}
// TestStats loads a BPF program once and executes back-to-back test runs
// of the program. See testStats for details.
func TestStats(t *testing.T) {
testutils.SkipOnOldKernel(t, "5.8", "BPF_ENABLE_STATS")
prog := mustSocketFilter(t)
pi, err := prog.Info()
if err != nil {
t.Errorf("failed to get ProgramInfo: %v", err)
}
rc, ok := pi.RunCount()
if !ok {
t.Errorf("expected run count info to be available")
}
if rc != 0 {
t.Errorf("expected a run count of 0 but got %d", rc)
}
rt, ok := pi.Runtime()
if !ok {
t.Errorf("expected runtime info to be available")
}
if rt != 0 {
t.Errorf("expected a runtime of 0ns but got %v", rt)
}
if err := testStats(prog); err != nil {
t.Error(err)
}
}
// BenchmarkStats is a benchmark of TestStats. See testStats for details.
func BenchmarkStats(b *testing.B) {
testutils.SkipOnOldKernel(b, "5.8", "BPF_ENABLE_STATS")
prog := mustSocketFilter(b)
for n := 0; n < b.N; n++ {
if err := testStats(prog); err != nil {
b.Fatal(fmt.Errorf("iter %d: %w", n, err))
}
}
}
// testStats implements the behaviour under test for TestStats
// and BenchmarkStats. First, a test run is executed with runtime statistics
// enabled, followed by another with runtime stats disabled. Counters are only
// expected to increase on the runs where runtime stats are enabled.
//
// Due to runtime behaviour on Go 1.14 and higher, the syscall backing
// (*Program).Test() could be invoked multiple times for each call to Test(),
// resulting in RunCount incrementing by more than one. Expecting RunCount to
// be of a specific value after a call to Test() is therefore not possible.
// See https://golang.org/doc/go1.14#runtime for more details.
func testStats(prog *Program) error {
in := internal.EmptyBPFContext
stats, err := EnableStats(uint32(unix.BPF_STATS_RUN_TIME))
if err != nil {
return fmt.Errorf("failed to enable stats: %v", err)
}
defer stats.Close()
// Program execution with runtime statistics enabled.
// Should increase both runtime and run counter.
if _, _, err := prog.Test(in); err != nil {
return fmt.Errorf("failed to trigger program: %v", err)
}
pi, err := prog.Info()
if err != nil {
return fmt.Errorf("failed to get ProgramInfo: %v", err)
}
rc, ok := pi.RunCount()
if !ok {
return errors.New("expected run count info to be available")
}
if rc < 1 {
return fmt.Errorf("expected a run count of at least 1 but got %d", rc)
}
// Store the run count for the next invocation.
lc := rc
rt, ok := pi.Runtime()
if !ok {
return errors.New("expected runtime info to be available")
}
if rt == 0 {
return errors.New("expected a runtime other than 0ns")
}
// Store the runtime value for the next invocation.
lt := rt
if err := stats.Close(); err != nil {
return fmt.Errorf("failed to disable statistics: %v", err)
}
// Second program execution, with runtime statistics gathering disabled.
// Total runtime and run counters are not expected to increase.
if _, _, err := prog.Test(in); err != nil {
return fmt.Errorf("failed to trigger program: %v", err)
}
pi, err = prog.Info()
if err != nil {
return fmt.Errorf("failed to get ProgramInfo: %v", err)
}
rc, ok = pi.RunCount()
if !ok {
return errors.New("expected run count info to be available")
}
if rc != lc {
return fmt.Errorf("run count unexpectedly increased over previous value (current: %v, prev: %v)", rc, lc)
}
rt, ok = pi.Runtime()
if !ok {
return errors.New("expected runtime info to be available")
}
if rt != lt {
return fmt.Errorf("runtime unexpectedly increased over the previous valu
356E
e (current: %v, prev: %v)", rt, lt)
}
return nil
}
func TestHaveProgramInfoMapIDs(t *testing.T) {
testutils.CheckFeatureTest(t, haveProgramInfoMapIDs)
}