77 lines
2.0 KiB
Go
77 lines
2.0 KiB
Go
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// Copyright 2018 Google LLC. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package expr
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import (
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"encoding/binary"
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"github.com/google/nftables/binaryutil"
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"github.com/mdlayher/netlink"
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"golang.org/x/sys/unix"
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)
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// Quota defines a threshold against a number of bytes.
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type Quota struct {
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Bytes uint64
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Consumed uint64
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Over bool
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}
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func (q *Quota) marshal() ([]byte, error) {
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attrs := []netlink.Attribute{
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{Type: unix.NFTA_QUOTA_BYTES, Data: binaryutil.BigEndian.PutUint64(q.Bytes)},
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{Type: unix.NFTA_QUOTA_CONSUMED, Data: binaryutil.BigEndian.PutUint64(q.Consumed)},
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}
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flags := uint32(0)
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if q.Over {
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flags = unix.NFT_QUOTA_F_INV
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}
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attrs = append(attrs, netlink.Attribute{
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Type: unix.NFTA_QUOTA_FLAGS,
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Data: binaryutil.BigEndian.PutUint32(flags),
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})
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data, err := netlink.MarshalAttributes(attrs)
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if err != nil {
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return nil, err
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}
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return netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_EXPR_NAME, Data: []byte("quota\x00")},
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{Type: unix.NLA_F_NESTED | unix.NFTA_EXPR_DATA, Data: data},
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})
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}
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func (q *Quota) unmarshal(data []byte) error {
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ad, err := netlink.NewAttributeDecoder(data)
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if err != nil {
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return err
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}
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ad.ByteOrder = binary.BigEndian
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for ad.Next() {
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switch ad.Type() {
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case unix.NFTA_QUOTA_BYTES:
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q.Bytes = ad.Uint64()
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case unix.NFTA_QUOTA_CONSUMED:
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q.Consumed = ad.Uint64()
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case unix.NFTA_QUOTA_FLAGS:
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q.Over = (ad.Uint32() & unix.NFT_QUOTA_F_INV) == 1
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}
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}
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return ad.Err()
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}
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