github.com/jayanthvn/pure-gobpf@v0.0.0-20230623131354-8d1d959d9e0b/pkg/ebpf_xdp/xdp_probes.go (about)

     1  // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License").
     4  // You may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //    http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  //limitations under the License.
    14  
    15  package ebpf_xdp
    16  
    17  import (
    18  	"fmt"
    19  
    20  	"github.com/jayanthvn/pure-gobpf/pkg/logger"
    21  	"github.com/vishvananda/netlink"
    22  )
    23  
    24  const (
    25  	XDP_ATTACH_MODE_NONE = 0
    26  	XDP_ATTACH_MODE_SKB  = 1
    27  	XDP_ATTACH_MODE_DRV  = 2
    28  	XDP_ATTACH_MODE_HW   = 3
    29  )
    30  
    31  var log = logger.Get()
    32  
    33  func XDPAttach(interfaceName string, progFD int) error {
    34  
    35  	//var log = logger.Get()
    36  	link, err := netlink.LinkByName(interfaceName)
    37  	if err != nil {
    38  		log.Infof("Failed linkbyname")
    39  		return fmt.Errorf("Get LinkByName failed: %v", err)
    40  	}
    41  
    42  	log.Infof("Attaching xdp to interface %s and prog %d", interfaceName, progFD)
    43  	if err := netlink.LinkSetXdpFdWithFlags(link, progFD, int(XDP_ATTACH_MODE_SKB)); err != nil {
    44  		log.Infof("failed to setxdp: %v", err)
    45  		return fmt.Errorf("LinkSetXdpFd failed: %v", err)
    46  	}
    47  	log.Infof("Attached XDP to interface %s", interfaceName)
    48  	return nil
    49  }
    50  
    51  func XDPDetach(interfaceName string) error {
    52  
    53  	//var log = logger.Get()
    54  	link, err := netlink.LinkByName(interfaceName)
    55  	if err != nil {
    56  		log.Infof("Failed linkbyname")
    57  		return fmt.Errorf("Get LinkByName failed: %v", err)
    58  	}
    59  
    60  	if err := netlink.LinkSetXdpFdWithFlags(link, -1, int(XDP_ATTACH_MODE_SKB)); err != nil {
    61  		log.Infof("failed to setxdp")
    62  		return fmt.Errorf("LinkSetXdpFd() failed: %v", err)
    63  	}
    64  	return nil
    65  }