psiphon-tunnel-core/vendor/github.com/google/nftables/util.go

// Copyright 2018 Google LLC. 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 nftables

import (
	"github.com/google/nftables/binaryutil"
	"golang.org/x/sys/unix"
)

func extraHeader(family uint8, resID uint16) []byte {
	return append([]byte{
		family,
		unix.NFNETLINK_V0,
	}, binaryutil.BigEndian.PutUint16(resID)...)
}