/
xdp.go
75 lines (59 loc) · 1.89 KB
/
xdp.go
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License").
// You may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
//limitations under the License.
package xdp
import (
constdef "github.com/aws/aws-ebpf-sdk-go/pkg/constants"
"github.com/aws/aws-ebpf-sdk-go/pkg/logger"
"github.com/vishvananda/netlink"
)
var log = logger.Get()
type BpfXdp interface {
XDPAttach(progFD int) error
XDPDetach() error
}
var _ BpfXdp = &bpfXdp{}
type bpfXdp struct {
interfaceName string
}
func New(ifName string) BpfXdp {
return &bpfXdp{
interfaceName: ifName,
}
}
func (b *bpfXdp) XDPAttach(progFD int) error {
link, err := netlink.LinkByName(b.interfaceName)
if err != nil {
log.Errorf("failed to obtain link info for %s : %v", b.interfaceName, err)
return err
}
log.Infof("Attaching xdp prog %d to interface %s", progFD, b.interfaceName)
if err := netlink.LinkSetXdpFdWithFlags(link, progFD, constdef.XDP_ATTACH_MODE_SKB); err != nil {
log.Errorf("failed to setup xdp: %v", err)
return err
}
log.Infof("Attached XDP to interface %s", b.interfaceName)
return nil
}
func (b *bpfXdp) XDPDetach() error {
link, err := netlink.LinkByName(b.interfaceName)
if err != nil {
log.Errorf("failed to obtain link info for %s : %v", b.interfaceName, err)
return err
}
if err := netlink.LinkSetXdpFdWithFlags(link, -1, constdef.XDP_ATTACH_MODE_SKB); err != nil {
log.Errorf("failed to setup xdp: %v", err)
return err
}
return nil
}