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package link
import (
"os"
"testing"
"github.com/cilium/ebpf"
"github.com/cilium/ebpf/asm"
"github.com/cilium/ebpf/internal/testutils"
)
func TestSkLookup(t *testing.T) {
testutils.SkipOnOldKernel(t, "5.8", "sk_lookup program")
prog := mustLoadProgram(t, ebpf.SkLookup, ebpf.AttachSkLookup, "")
netns, err := os.Open("/proc/self/ns/net")
if err != nil {
t.Fatal(err)
}
defer netns.Close()
link, err := AttachNetNs(int(netns.Fd()), prog)
if err != nil {
t.Fatal("Can't attach link:", err)
}
testLink(t, link, prog)
}
func createSkLookupProgram() (*ebpf.Program, error) {
prog, err := ebpf.NewProgram(&ebpf.ProgramSpec{
Type: ebpf.SkLookup,
AttachType: ebpf.AttachSkLookup,
License: "MIT",
Instructions: asm.Instructions{
asm.Mov.Imm(asm.R0, 0),
asm.Return(),
},
})
if err != nil {
return nil, err
}
return prog, nil
}
func ExampleAttachNetNs() {
prog, err := createSkLookupProgram()
if err != nil {
panic(err)
}
defer prog.Close()
// This can be a path to another netns as well.
netns, err := os.Open("/proc/self/ns/net")
if err != nil {
panic(err)
}
defer netns.Close()
link, err := AttachNetNs(int(netns.Fd()), prog)
if err != nil {
panic(err)
}
// The socket lookup program is now active until Close().
link.Close()
}
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