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matched_field.go
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matched_field.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 datatype
import (
"fmt"
)
const (
NUM_64_OFFSET = 6
NUM_64_MASK = 0x3f
)
const (
MATCHED_FIELD_BITS_LEN = 144 // 8(TapType) + 8(Proto) + 16(Port)*2 + 16(L3EPC)*2 + 32(IP)*2
MATCHED_FIELD_LEN = 3
)
type MatchFlags uint16
const (
// fields[0]
MATCHED_SRC_IP MatchFlags = iota
MATCHED_DST_IP
// fields[1]
MATCHED_SRC_EPC
MATCHED_DST_EPC
MATCHED_SRC_PORT
MATCHED_DST_PORT
// fields[2]
MATCHED_PROTO
MATCHED_TAP_TYPE
)
var fieldOffset = [...]uint64{
MATCHED_SRC_IP: 0,
MATCHED_DST_IP: 32,
MATCHED_SRC_EPC: 64,
MATCHED_DST_EPC: 80,
MATCHED_SRC_PORT: 96,
MATCHED_DST_PORT: 112,
MATCHED_PROTO: 128,
MATCHED_TAP_TYPE: 136,
}
var fieldMask = [...]uint64{
MATCHED_SRC_IP: 0xffffffff,
MATCHED_DST_IP: 0xffffffff,
MATCHED_SRC_EPC: 0xffff,
MATCHED_DST_EPC: 0xffff,
MATCHED_SRC_PORT: 0xffff,
MATCHED_DST_PORT: 0xffff,
MATCHED_PROTO: 0xff,
MATCHED_TAP_TYPE: 0xff,
}
type MatchedField struct {
fields [MATCHED_FIELD_LEN]uint64
}
var (
blankMatchedFieldForInit MatchedField = MatchedField{}
)
func (f *MatchedField) GobEncode() ([]byte, error) {
return []byte{}, nil
}
func (f *MatchedField) GobDecode(in []byte) error {
return nil
}
func (f *MatchedField) Get(flag MatchFlags) uint64 {
index := fieldOffset[flag] >> NUM_64_OFFSET // fieldOffset[flag] / 64
offset := fieldOffset[flag] & NUM_64_MASK // fieldOffset[flag] % 64
return (f.fields[index] >> offset) & fieldMask[flag]
}
func (f *MatchedField) Set(flag MatchFlags, value uint64) {
index := fieldOffset[flag] >> NUM_64_OFFSET // fieldOffset[flag] / 64
offset := fieldOffset[flag] & NUM_64_MASK // fieldOffset[flag] % 64
f.fields[index] &= ^(fieldMask[flag] << offset)
f.fields[index] |= (value << offset)
}
func (f *MatchedField) SetMask(flag MatchFlags, value uint64) {
if value != 0 {
value = fieldMask[flag]
}
f.Set(flag, value)
}
func (f *MatchedField) SetBits(whichs ...int) {
// MATCHED_FIELD_LEN是4, 只清理了4个
*f = blankMatchedFieldForInit
for _, which := range whichs {
index := which >> NUM_64_OFFSET // which / 64
offset := uint(which & NUM_64_MASK) // which % 64
f.fields[index] |= (1 << offset)
}
}
// TODO: 这个函数申请的内存比较多,考虑到内存不是常驻内存会GC掉目前不做优化
func (f *MatchedField) GetAllTableIndex(maskVector, mask *MatchedField, min, max int, vectorBits []int) []uint16 {
// 若f为0101, maskVector为0111, mask为1001,返回{001,011,101,111}
index := f.GetTableIndex(maskVector, min, max)
indexOffset := make([]int, 0, 1)
for i, offset := range vectorBits {
// 掩码对应的位为0,表示全采集
if mask.IsBitZero(offset) {
indexOffset = append(indexOffset, i)
}
}
// index 101 -> 001,将全采集的位至为0
for _, offset := range indexOffset {
index &= ^(1 << uint16(offset))
}
base := make([]uint16, 0, 1)
base = append(base, index)
for _, offset := range indexOffset {
create := make([]uint16, len(base))
for i, _ := range create {
create[i] = base[i] | 1<<uint16(offset)
}
base = append(base, create...)
}
return base
}
func (f *MatchedField) GetTableIndex(maskVector *MatchedField, min, max int) uint16 {
result := f.And(maskVector)
index := uint16(0)
offset := uint16(0)
for i := min; i <= max; i++ {
if !result.IsBitZero(i) {
index |= 1 << offset
}
if !maskVector.IsBitZero(i) {
offset++
}
}
return index
}
func (f *MatchedField) IsBitZero(offset int) bool {
index := offset >> 6
position := offset & 0x3f
return (f.fields[index]>>uint64(position))&0x1 == 0
}
func (f *MatchedField) Equal(n *MatchedField) bool {
return f.fields[0] == n.fields[0] && f.fields[1] == n.fields[1] && f.fields[2] == n.fields[2]
}
func (f *MatchedField) Or(n *MatchedField) MatchedField {
result := MatchedField{}
result.fields[0] = f.fields[0] | n.fields[0]
result.fields[1] = f.fields[1] | n.fields[1]
result.fields[2] = f.fields[2] | n.fields[2]
return result
}
func (f *MatchedField) And(n *MatchedField) MatchedField {
result := MatchedField{}
result.fields[0] = f.fields[0] & n.fields[0]
result.fields[1] = f.fields[1] & n.fields[1]
result.fields[2] = f.fields[2] & n.fields[2]
return result
}
func (f MatchedField) String() string {
return fmt.Sprintf("%x:%d -> %x:%d epc: %d -> %d proto: %d tap: %d",
f.Get(MATCHED_SRC_IP), f.Get(MATCHED_SRC_PORT),
f.Get(MATCHED_DST_IP), f.Get(MATCHED_DST_PORT),
f.Get(MATCHED_SRC_EPC), f.Get(MATCHED_DST_EPC),
f.Get(MATCHED_PROTO), f.Get(MATCHED_TAP_TYPE))
}