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//go:build linux
package features
import (
"errors"
"fmt"
"math"
"testing"
"github.com/cilium/ebpf"
"github.com/cilium/ebpf/asm"
"github.com/cilium/ebpf/internal"
"github.com/cilium/ebpf/internal/testutils"
"github.com/cilium/ebpf/internal/testutils/fdtrace"
)
func TestMain(m *testing.M) {
fdtrace.TestMain(m)
}
func TestHaveProgramType(t *testing.T) {
testutils.CheckFeatureMatrix(t, haveProgramTypeMatrix)
}
func TestHaveProgramTypeInvalid(t *testing.T) {
if err := HaveProgramType(ebpf.ProgramType(math.MaxUint32)); err == nil {
t.Fatal("Expected an error")
} else if errors.Is(err, internal.ErrNotSupported) {
t.Fatal("Got ErrNotSupported:", err)
}
}
func TestHaveProgramHelper(t *testing.T) {
type testCase struct {
prog ebpf.ProgramType
helper asm.BuiltinFunc
expected error
version string
}
// Referencing linux kernel commits to track the kernel version required to pass these test cases.
// They cases are derived from libbpf's selftests and helper/prog combinations that are
// probed for in cilium/cilium.
testCases := []testCase{
{ebpf.Kprobe, asm.FnMapLookupElem, nil, "3.19"}, // d0003ec01c66
{ebpf.SocketFilter, asm.FnKtimeGetCoarseNs, nil, "5.11"}, // d05512618056
{ebpf.SchedCLS, asm.FnSkbVlanPush, nil, "4.3"}, // 4e10df9a60d9
{ebpf.Kprobe, asm.FnSkbVlanPush, ebpf.ErrNotSupported, "4.3"}, // 4e10df9a60d9
{ebpf.Kprobe, asm.FnSysBpf, ebpf.ErrNotSupported, "5.14"}, // 79a7f8bdb159
{ebpf.Syscall, asm.FnSysBpf, nil, "5.14"}, // 79a7f8bdb159
{ebpf.XDP, asm.FnJiffies64, nil, "5.5"}, // 5576b991e9c1
{ebpf.XDP, asm.FnKtimeGetBootNs, nil, "5.7"}, // 71d19214776e
{ebpf.SchedCLS, asm.FnSkbChangeHead, nil, "5.8"}, // 6f3f65d80dac
{ebpf.SchedCLS, asm.FnRedirectNeigh, nil, "5.10"}, // b4ab31414970
{ebpf.SchedCLS, asm.FnSkbEcnSetCe, nil, "5.1"}, // f7c917ba11a6
{ebpf.SchedACT, asm.FnSkAssign, nil, "5.6"}, // cf7fbe660f2d
{ebpf.SchedACT, asm.FnFibLookup, nil, "4.18"}, // 87f5fc7e48dd
{ebpf.Kprobe, asm.FnFibLookup, ebpf.ErrNotSupported, "4.18"}, // 87f5fc7e48dd
{ebpf.CGroupSockAddr, asm.FnGetsockopt, nil, "5.8"}, // beecf11bc218
{ebpf.CGroupSockAddr, asm.FnSkLookupTcp, nil, "4.20"}, // 6acc9b432e67
{ebpf.CGroupSockAddr, asm.FnGetNetnsCookie, nil, "5.7"}, // f318903c0bf4
{ebpf.CGroupSock, asm.FnGetNetnsCookie, nil, "5.7"}, // f318903c0bf4
{ebpf.Kprobe, asm.FnKtimeGetCoarseNs, ebpf.ErrNotSupported, "5.16"}, // 5e0bc3082e2e
{ebpf.CGroupSockAddr, asm.FnGetCgroupClassid, nil, "5.7"}, // 5a52ae4e32a6
{ebpf.Kprobe, asm.FnGetBranchSnapshot, nil, "5.16"}, // 856c02dbce4f
{ebpf.SchedCLS, asm.FnSkbSetTstamp, nil, "5.18"}, // 9bb984f28d5b
}
for _, tc := range testCases {
t.Run(fmt.Sprintf("%s/%s", tc.prog.String(), tc.helper.String()), func(t *testing.T) {
feature := fmt.Sprintf("helper %s for program type %s", tc.helper.String(), tc.prog.String())
testutils.SkipOnOldKernel(t, tc.version, feature)
err := HaveProgramHelper(tc.prog, tc.helper)
if !errors.Is(err, tc.expected) {
t.Fatalf("%s/%s: %v", tc.prog.String(), tc.helper.String(), err)
}
})
}
}
func TestHelperProbeNotImplemented(t *testing.T) {
// Currently we don't support probing helpers for Tracing, Extension, LSM and StructOps programs.
// For each of those test the availability of the FnMapLookupElem helper and expect it to fail.
for _, pt := range []ebpf.ProgramType{ebpf.Tracing, ebpf.Extension, ebpf.LSM, ebpf.StructOps} {
t.Run(pt.String(), func(t *testing.T) {
if err := HaveProgramHelper(pt, asm.FnMapLookupElem); err == nil {
t.Fatal("Expected an error")
}
})
}
}
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