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port.go
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port.go
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// Copyright 2019-2020 Authors of Hubble
//
// 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 filters
import (
"context"
"fmt"
"strconv"
flowpb "github.com/cilium/cilium/api/v1/flow"
v1 "github.com/cilium/cilium/pkg/hubble/api/v1"
)
func sourcePort(ev *v1.Event) (port uint16, ok bool) {
l4 := ev.GetFlow().GetL4()
if tcp := l4.GetTCP(); tcp != nil {
return uint16(tcp.SourcePort), true
}
if udp := l4.GetUDP(); udp != nil {
return uint16(udp.SourcePort), true
}
return 0, false
}
func destinationPort(ev *v1.Event) (port uint16, ok bool) {
l4 := ev.GetFlow().GetL4()
if tcp := l4.GetTCP(); tcp != nil {
return uint16(tcp.DestinationPort), true
}
if udp := l4.GetUDP(); udp != nil {
return uint16(udp.DestinationPort), true
}
return 0, false
}
func filterByPort(portStrs []string, getPort func(*v1.Event) (port uint16, ok bool)) (FilterFunc, error) {
ports := make([]uint16, 0, len(portStrs))
for _, p := range portStrs {
port, err := strconv.ParseUint(p, 10, 16)
if err != nil {
return nil, fmt.Errorf("invalid port %q: %s", p, err)
}
ports = append(ports, uint16(port))
}
return func(ev *v1.Event) bool {
if port, ok := getPort(ev); ok {
for _, p := range ports {
if p == port {
return true
}
}
}
return false
}, nil
}
// PortFilter implements filtering based on L4 port numbers
type PortFilter struct{}
// OnBuildFilter builds a L4 port filter
func (p *PortFilter) OnBuildFilter(ctx context.Context, ff *flowpb.FlowFilter) ([]FilterFunc, error) {
var fs []FilterFunc
if ff.GetSourcePort() != nil {
spf, err := filterByPort(ff.GetSourcePort(), sourcePort)
if err != nil {
return nil, fmt.Errorf("invalid source port filter: %v", err)
}
fs = append(fs, spf)
}
if ff.GetDestinationPort() != nil {
dpf, err := filterByPort(ff.GetDestinationPort(), destinationPort)
if err != nil {
return nil, fmt.Errorf("invalid destination port filter: %v", err)
}
fs = append(fs, dpf)
}
return fs, nil
}