123 lines
3.6 KiB
Go
123 lines
3.6 KiB
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 (
|
|
"sync"
|
|
|
|
"golang.org/x/sys/unix"
|
|
)
|
|
|
|
type MonitorEvent uint8
|
|
|
|
const (
|
|
MonitorEventNew MonitorEvent = 1 << iota
|
|
MonitorEventDel
|
|
MonitorEventMask MonitorEvent = (1 << iota) - 1
|
|
MonitorEventAny MonitorEvent = MonitorEventMask
|
|
)
|
|
|
|
type MonitorObject uint32
|
|
|
|
// Possible MonitorObject values.
|
|
const (
|
|
MonitorObjectTables MonitorObject = 1 << iota
|
|
MonitorObjectChains
|
|
MonitorObjectSets
|
|
MonitorObjectRules
|
|
MonitorObjectElements
|
|
MonitorObjectRuleset
|
|
MonitorObjectTrace
|
|
MonitorObjectMask MonitorObject = (1 << iota) - 1
|
|
MonitorObjectAny MonitorObject = MonitorObjectMask
|
|
)
|
|
|
|
var (
|
|
monitorFlags map[MonitorEvent]map[MonitorObject]uint32
|
|
monitorFlagsInitOnce sync.Once
|
|
)
|
|
|
|
func lazyInitOnce() {
|
|
monitorFlagsInitOnce.Do(func() {
|
|
monitorFlags = map[MonitorEvent]map[MonitorObject]uint32{
|
|
MonitorEventAny: {
|
|
MonitorObjectAny: 0xffffffff,
|
|
MonitorObjectTables: 1<<unix.NFT_MSG_NEWTABLE | 1<<unix.NFT_MSG_DELCHAIN,
|
|
MonitorObjectChains: 1<<unix.NFT_MSG_NEWCHAIN | 1<<unix.NFT_MSG_DELCHAIN,
|
|
MonitorObjectRules: 1<<unix.NFT_MSG_NEWRULE | 1<<unix.NFT_MSG_DELRULE,
|
|
MonitorObjectSets: 1<<unix.NFT_MSG_NEWSET | 1<<unix.NFT_MSG_DELSET,
|
|
MonitorObjectElements: 1<<unix.NFT_MSG_NEWSETELEM | 1<<unix.NFT_MSG_DELSETELEM,
|
|
MonitorObjectRuleset: 1<<unix.NFT_MSG_NEWTABLE | 1<<unix.NFT_MSG_DELCHAIN |
|
|
1<<unix.NFT_MSG_NEWCHAIN | 1<<unix.NFT_MSG_DELCHAIN |
|
|
1<<unix.NFT_MSG_NEWRULE | 1<<unix.NFT_MSG_DELRULE |
|
|
1<<unix.NFT_MSG_NEWSET | 1<<unix.NFT_MSG_DELSET |
|
|
1<<unix.NFT_MSG_NEWSETELEM | 1<<unix.NFT_MSG_DELSETELEM |
|
|
1<<unix.NFT_MSG_NEWOBJ | 1<<unix.NFT_MSG_DELOBJ,
|
|
MonitorObjectTrace: 1 << unix.NFT_MSG_TRACE,
|
|
},
|
|
MonitorEventNew: {
|
|
MonitorObjectAny: 1<<unix.NFT_MSG_NEWTABLE |
|
|
1<<unix.NFT_MSG_NEWCHAIN |
|
|
1<<unix.NFT_MSG_NEWRULE |
|
|
1<<unix.NFT_MSG_NEWSET |
|
|
1<<unix.NFT_MSG_NEWSETELEM,
|
|
MonitorObjectTables: 1 << unix.NFT_MSG_NEWTABLE,
|
|
MonitorObjectChains: 1 << unix.NFT_MSG_NEWCHAIN,
|
|
MonitorObjectRules: 1 << unix.NFT_MSG_NEWRULE,
|
|
MonitorObjectSets: 1 << unix.NFT_MSG_NEWSET,
|
|
MonitorObjectRuleset: 1<<unix.NFT_MSG_NEWTABLE |
|
|
1<<unix.NFT_MSG_NEWCHAIN |
|
|
1<<unix.NFT_MSG_NEWRULE |
|
|
1<<unix.NFT_MSG_NEWSET |
|
|
1<<unix.NFT_MSG_NEWSETELEM |
|
|
1<<unix.NFT_MSG_NEWOBJ,
|
|
MonitorObjectTrace: 0,
|
|
},
|
|
MonitorEventDel: {
|
|
MonitorObjectAny: 1<<unix.NFT_MSG_DELTABLE |
|
|
1<<unix.NFT_MSG_DELCHAIN |
|
|
1<<unix.NFT_MSG_DELRULE |
|
|
1<<unix.NFT_MSG_DELSET |
|
|
1<<unix.NFT_MSG_DELSETELEM |
|
|
1<<unix.NFT_MSG_DELOBJ,
|
|
MonitorObjectTrace: 0,
|
|
},
|
|
}
|
|
})
|
|
}
|
|
|
|
type Monitor struct {
|
|
Event MonitorEvent
|
|
Object MonitorObject
|
|
BufferSize int
|
|
}
|
|
|
|
func (monitor *Monitor) AddMonitorObject(obj MonitorObject) {
|
|
monitor.Object = monitor.Object | obj
|
|
}
|
|
|
|
type Event struct{}
|
|
|
|
func (cc *Conn) AddMonitor(monitor *Monitor) (chan *Event, error) {
|
|
_, closer, err := cc.netlinkConn()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer func() { _ = closer() }()
|
|
|
|
ch := make(chan *Event, monitor.BufferSize)
|
|
return ch, nil
|
|
}
|