/
interest.go
84 lines (71 loc) · 2.24 KB
/
interest.go
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/*
* Copyright (c) 2024 Yunshan Networks
*
* 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 policy
import (
"math"
. "github.com/deepflowio/deepflow/server/libs/datatype"
)
type InterestTable struct {
InterestPortMaps *[math.MaxUint16 + 1]PortRange
}
func (t *InterestTable) Init() {
t.InterestPortMaps = &[math.MaxUint16 + 1]PortRange{}
}
func (t *InterestTable) generateInterestPortMap(acls []*Acl) {
interestPortMaps := &[math.MaxUint16 + 1]PortRange{}
ports := make([]PortRange, 0, 1000)
for _, acl := range acls {
ports = append(ports, acl.SrcPortRange...)
ports = append(ports, acl.DstPortRange...)
}
ports = GetPortRanges(ports)
lastMax, portOther := uint16(0), uint16(0)
for index, port := range ports {
if index == 0 {
lastMax = port.Max()
} else if portOther != 0 {
if port.Min()-lastMax > 1 {
portOther = lastMax + 1
}
lastMax = port.Max()
}
for i := int(port.Min()); i <= int(port.Max()); i++ {
interestPortMaps[i] = port
}
}
if portOther == 0 && math.MaxUint16-lastMax > 1 {
portOther = lastMax + 1
}
if portOther != 0 {
// portOther为非策略端口中的的第一个端口
// 为了减少内存,减少fastPath项, 所有不在策略中的端口使用portOther来建立查询fastPath
for i := 1; i <= math.MaxUint16; i++ {
if 0 == interestPortMaps[i] {
interestPortMaps[i] = NewPortRange(portOther, portOther)
}
}
}
t.InterestPortMaps = interestPortMaps
}
func (t *InterestTable) GenerateInterestMaps(acls []*Acl) {
t.generateInterestPortMap(acls)
}
func (t *InterestTable) getFastInterestKeys(packet *LookupKey) {
ports := t.InterestPortMaps[packet.SrcPort]
packet.SrcPort = ports.Min()
ports = t.InterestPortMaps[packet.DstPort]
packet.DstPort = ports.Min()
}