Update dependencies

vendor/github.com/google/nftables/expr/numgen.go

@@ -0,0 +1,78 @@
+// 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 expr
+
+import (
+	"encoding/binary"
+	"fmt"
+
+	"github.com/google/nftables/binaryutil"
+	"github.com/mdlayher/netlink"
+	"golang.org/x/sys/unix"
+)
+
+// Numgen defines Numgen expression structure
+type Numgen struct {
+	Register uint32
+	Modulus  uint32
+	Type     uint32
+	Offset   uint32
+}
+
+func (e *Numgen) marshal(fam byte) ([]byte, error) {
+	// Currently only two types are supported, failing if Type is not of two known types
+	switch e.Type {
+	case unix.NFT_NG_INCREMENTAL:
+	case unix.NFT_NG_RANDOM:
+	default:
+		return nil, fmt.Errorf("unsupported numgen type %d", e.Type)
+	}
+
+	data, err := netlink.MarshalAttributes([]netlink.Attribute{
+		{Type: unix.NFTA_NG_DREG, Data: binaryutil.BigEndian.PutUint32(e.Register)},
+		{Type: unix.NFTA_NG_MODULUS, Data: binaryutil.BigEndian.PutUint32(e.Modulus)},
+		{Type: unix.NFTA_NG_TYPE, Data: binaryutil.BigEndian.PutUint32(e.Type)},
+		{Type: unix.NFTA_NG_OFFSET, Data: binaryutil.BigEndian.PutUint32(e.Offset)},
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return netlink.MarshalAttributes([]netlink.Attribute{
+		{Type: unix.NFTA_EXPR_NAME, Data: []byte("numgen\x00")},
+		{Type: unix.NLA_F_NESTED | unix.NFTA_EXPR_DATA, Data: data},
+	})
+}
+
+func (e *Numgen) unmarshal(fam byte, data []byte) error {
+	ad, err := netlink.NewAttributeDecoder(data)
+	if err != nil {
+		return err
+	}
+	ad.ByteOrder = binary.BigEndian
+	for ad.Next() {
+		switch ad.Type() {
+		case unix.NFTA_NG_DREG:
+			e.Register = ad.Uint32()
+		case unix.NFTA_NG_MODULUS:
+			e.Modulus = ad.Uint32()
+		case unix.NFTA_NG_TYPE:
+			e.Type = ad.Uint32()
+		case unix.NFTA_NG_OFFSET:
+			e.Offset = ad.Uint32()
+		}
+	}
+	return ad.Err()
+}