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pred_port.go
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pred_port.go
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// Copyright 2020 Anapaya Systems
//
// 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 pktcls
import (
"encoding/json"
"fmt"
)
// Ports represents source and destination ports, irrespective of the
// specific L3 and L4 protocol.
type Ports struct {
Src uint16
Dst uint16
}
// PortPredicate describes a single test on port fields.
type PortPredicate interface {
// Eval returns true if the packet matched the predicate
Eval(*Ports) bool
Typer
fmt.Stringer
}
var _ PortPredicate = (*PortMatchSource)(nil)
// PortMatchSource checks whether the source port is within the specified range.
type PortMatchSource struct {
MinPort uint16
MaxPort uint16
}
func (m *PortMatchSource) Type() string {
return "MatchSourcePort"
}
func (m *PortMatchSource) Eval(p *Ports) bool {
return p.Src >= m.MinPort && p.Src <= m.MaxPort
}
func (m *PortMatchSource) String() string {
return fmt.Sprintf("srcport=%d-%d", m.MinPort, m.MaxPort)
}
func (m *PortMatchSource) MarshalJSON() ([]byte, error) {
return json.Marshal(
jsonContainer{
"MinPort": fmt.Sprintf("%d", m.MinPort),
"MaxPort": fmt.Sprintf("%d", m.MaxPort),
},
)
}
func (m *PortMatchSource) UnmarshalJSON(b []byte) error {
minPort, err := unmarshalUintField(b, "MatchSourcePort", "MinPort", 16)
if err != nil {
return err
}
maxPort, err := unmarshalUintField(b, "MatchSourcePort", "MaxPort", 16)
if err != nil {
return err
}
m.MinPort = uint16(minPort)
m.MaxPort = uint16(maxPort)
return nil
}
var _ PortPredicate = (*PortMatchDestination)(nil)
// PortMatchDestination checks whether the destination port is within the specified range.
type PortMatchDestination struct {
MinPort uint16
MaxPort uint16
}
func (m *PortMatchDestination) Type() string {
return "MatchDestinationPort"
}
func (m *PortMatchDestination) Eval(p *Ports) bool {
return p.Dst >= m.MinPort && p.Dst <= m.MaxPort
}
func (m *PortMatchDestination) String() string {
return fmt.Sprintf("dstport=%d-%d", m.MinPort, m.MaxPort)
}
func (m *PortMatchDestination) MarshalJSON() ([]byte, error) {
return json.Marshal(
jsonContainer{
"MinPort": fmt.Sprintf("%d", m.MinPort),
"MaxPort": fmt.Sprintf("%d", m.MaxPort),
},
)
}
func (m *PortMatchDestination) UnmarshalJSON(b []byte) error {
minPort, err := unmarshalUintField(b, "MatchDestinationPort", "MinPort", 16)
if err != nil {
return err
}
maxPort, err := unmarshalUintField(b, "MatchDestinationPort", "MaxPort", 16)
if err != nil {
return err
}
m.MinPort = uint16(minPort)
m.MaxPort = uint16(maxPort)
return nil
}