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package link
import (
"fmt"
"github.com/cilium/ebpf"
"github.com/cilium/ebpf/internal/sys"
)
// NetNsLink is a program attached to a network namespace.
type NetNsLink struct {
RawLink
}
// AttachNetNs attaches a program to a network namespace.
func AttachNetNs(ns int, prog *ebpf.Program) (*NetNsLink, error) {
var attach ebpf.AttachType
switch t := prog.Type(); t {
case ebpf.FlowDissector:
attach = ebpf.AttachFlowDissector
case ebpf.SkLookup:
attach = ebpf.AttachSkLookup
default:
return nil, fmt.Errorf("can't attach %v to network namespace", t)
}
link, err := AttachRawLink(RawLinkOptions{
Target: ns,
Program: prog,
Attach: attach,
})
if err != nil {
return nil, err
}
return &NetNsLink{*link}, nil
}
func (ns *NetNsLink) Info() (*Info, error) {
var info sys.NetNsLinkInfo
if err := sys.ObjInfo(ns.fd, &info); err != nil {
return nil, fmt.Errorf("netns link info: %s", err)
}
extra := &NetNsInfo{
NetnsIno: info.NetnsIno,
AttachType: info.AttachType,
}
return &Info{
info.Type,
info.Id,
ebpf.ProgramID(info.ProgId),
extra,
}, nil
}
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