diff options
Diffstat (limited to 'vendor/github.com/cilium/ebpf/link/tracing.go')
-rw-r--r-- | vendor/github.com/cilium/ebpf/link/tracing.go | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/vendor/github.com/cilium/ebpf/link/tracing.go b/vendor/github.com/cilium/ebpf/link/tracing.go deleted file mode 100644 index e47e61a3b..000000000 --- a/vendor/github.com/cilium/ebpf/link/tracing.go +++ /dev/null @@ -1,141 +0,0 @@ -package link - -import ( - "fmt" - - "github.com/cilium/ebpf" - "github.com/cilium/ebpf/btf" - "github.com/cilium/ebpf/internal/sys" -) - -type tracing struct { - RawLink -} - -func (f *tracing) Update(new *ebpf.Program) error { - return fmt.Errorf("tracing update: %w", ErrNotSupported) -} - -// AttachFreplace attaches the given eBPF program to the function it replaces. -// -// The program and name can either be provided at link time, or can be provided -// at program load time. If they were provided at load time, they should be nil -// and empty respectively here, as they will be ignored by the kernel. -// Examples: -// -// AttachFreplace(dispatcher, "function", replacement) -// AttachFreplace(nil, "", replacement) -func AttachFreplace(targetProg *ebpf.Program, name string, prog *ebpf.Program) (Link, error) { - if (name == "") != (targetProg == nil) { - return nil, fmt.Errorf("must provide both or neither of name and targetProg: %w", errInvalidInput) - } - if prog == nil { - return nil, fmt.Errorf("prog cannot be nil: %w", errInvalidInput) - } - if prog.Type() != ebpf.Extension { - return nil, fmt.Errorf("eBPF program type %s is not an Extension: %w", prog.Type(), errInvalidInput) - } - - var ( - target int - typeID btf.TypeID - ) - if targetProg != nil { - btfHandle, err := targetProg.Handle() - if err != nil { - return nil, err - } - defer btfHandle.Close() - - spec, err := btfHandle.Spec(nil) - if err != nil { - return nil, err - } - - var function *btf.Func - if err := spec.TypeByName(name, &function); err != nil { - return nil, err - } - - target = targetProg.FD() - typeID, err = spec.TypeID(function) - if err != nil { - return nil, err - } - } - - link, err := AttachRawLink(RawLinkOptions{ - Target: target, - Program: prog, - Attach: ebpf.AttachNone, - BTF: typeID, - }) - if err != nil { - return nil, err - } - - return &tracing{*link}, nil -} - -type TracingOptions struct { - // Program must be of type Tracing with attach type - // AttachTraceFEntry/AttachTraceFExit/AttachModifyReturn or - // AttachTraceRawTp. - Program *ebpf.Program -} - -type LSMOptions struct { - // Program must be of type LSM with attach type - // AttachLSMMac. - Program *ebpf.Program -} - -// attachBTFID links all BPF program types (Tracing/LSM) that they attach to a btf_id. -func attachBTFID(program *ebpf.Program) (Link, error) { - if program.FD() < 0 { - return nil, fmt.Errorf("invalid program %w", sys.ErrClosedFd) - } - - fd, err := sys.RawTracepointOpen(&sys.RawTracepointOpenAttr{ - ProgFd: uint32(program.FD()), - }) - if err != nil { - return nil, err - } - - raw := RawLink{fd: fd} - info, err := raw.Info() - if err != nil { - raw.Close() - return nil, err - } - - if info.Type == RawTracepointType { - // Sadness upon sadness: a Tracing program with AttachRawTp returns - // a raw_tracepoint link. Other types return a tracing link. - return &rawTracepoint{raw}, nil - } - - return &tracing{RawLink: RawLink{fd: fd}}, nil -} - -// AttachTracing links a tracing (fentry/fexit/fmod_ret) BPF program or -// a BTF-powered raw tracepoint (tp_btf) BPF Program to a BPF hook defined -// in kernel modules. -func AttachTracing(opts TracingOptions) (Link, error) { - if t := opts.Program.Type(); t != ebpf.Tracing { - return nil, fmt.Errorf("invalid program type %s, expected Tracing", t) - } - - return attachBTFID(opts.Program) -} - -// AttachLSM links a Linux security module (LSM) BPF Program to a BPF -// hook defined in kernel modules. -func AttachLSM(opts LSMOptions) (Link, error) { - if t := opts.Program.Type(); t != ebpf.LSM { - return nil, fmt.Errorf("invalid program type %s, expected LSM", t) - } - - return attachBTFID(opts.Program) -} |