Add support for additional TC BPF filter attributes

In order to support BPF_SYSCALL `PROG_GET_FD_BY_ID` -- the ID of the
eBPF must be available.

Add the additional enumerations and handle them when parsing the BPF
filter.

.gitignore

@@ -0,0 +1 @@
+.idea/

filter.go

@@ -240,6 +240,8 @@ type BpfFilter struct {
 	Fd           int
 	Name         string
 	DirectAction bool
+	Id           int
+	Tag          string
 }
 
 func (filter *BpfFilter) Type() string {

filter_linux.go

@@ -3,6 +3,7 @@ package netlink
 import (
 	"bytes"
 	"encoding/binary"
+	"encoding/hex"
 	"errors"
 	"fmt"
 	"syscall"
@@ -627,6 +628,10 @@ func parseBpfData(filter Filter, data []syscall.NetlinkRouteAttr) (bool, error)
 			if (flags & nl.TCA_BPF_FLAG_ACT_DIRECT) != 0 {
 				bpf.DirectAction = true
 			}
+		case nl.TCA_BPF_ID:
+			bpf.Id = int(native.Uint32(datum.Value[0:4]))
+		case nl.TCA_BPF_TAG:
+			bpf.Tag = hex.EncodeToString(datum.Value[:len(datum.Value)-1])
 		}
 	}
 	return detailed, nil

nl/tc_linux.go

@@ -648,7 +648,10 @@ const (
 	TCA_BPF_FD
 	TCA_BPF_NAME
 	TCA_BPF_FLAGS
-	TCA_BPF_MAX = TCA_BPF_FLAGS
+	TCA_BPF_FLAGS_GEN
+	TCA_BPF_TAG
+	TCA_BPF_ID
+	TCA_BPF_MAX = TCA_BPF_ID
 )
 
 type TcBpf TcGen