77 lines
1.8 KiB
Go
77 lines
1.8 KiB
Go
package link
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import (
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"fmt"
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"github.com/cilium/ebpf"
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"github.com/cilium/ebpf/internal/sys"
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)
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type RawAttachProgramOptions struct {
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// File descriptor to attach to. This differs for each attach type.
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Target int
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// Program to attach.
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Program *ebpf.Program
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// Program to replace (cgroups).
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Replace *ebpf.Program
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// Attach must match the attach type of Program (and Replace).
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Attach ebpf.AttachType
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// Flags control the attach behaviour. This differs for each attach type.
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Flags uint32
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}
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// RawAttachProgram is a low level wrapper around BPF_PROG_ATTACH.
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//
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// You should use one of the higher level abstractions available in this
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// package if possible.
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func RawAttachProgram(opts RawAttachProgramOptions) error {
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if err := haveProgAttach(); err != nil {
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return err
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}
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var replaceFd uint32
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if opts.Replace != nil {
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replaceFd = uint32(opts.Replace.FD())
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}
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attr := sys.ProgAttachAttr{
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TargetFd: uint32(opts.Target),
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AttachBpfFd: uint32(opts.Program.FD()),
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ReplaceBpfFd: replaceFd,
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AttachType: uint32(opts.Attach),
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AttachFlags: uint32(opts.Flags),
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}
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if err := sys.ProgAttach(&attr); err != nil {
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return fmt.Errorf("can't attach program: %w", err)
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}
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return nil
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}
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type RawDetachProgramOptions struct {
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Target int
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Program *ebpf.Program
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Attach ebpf.AttachType
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}
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// RawDetachProgram is a low level wrapper around BPF_PROG_DETACH.
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//
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// You should use one of the higher level abstractions available in this
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// package if possible.
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func RawDetachProgram(opts RawDetachProgramOptions) error {
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if err := haveProgAttach(); err != nil {
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return err
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}
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attr := sys.ProgDetachAttr{
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TargetFd: uint32(opts.Target),
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AttachBpfFd: uint32(opts.Program.FD()),
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AttachType: uint32(opts.Attach),
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}
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if err := sys.ProgDetach(&attr); err != nil {
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return fmt.Errorf("can't detach program: %w", err)
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}
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return nil
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}
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