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protocol.go
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protocol.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"
"strings"
flowpb "github.com/cilium/cilium/api/v1/flow"
v1 "github.com/cilium/cilium/pkg/hubble/api/v1"
)
func filterByProtocol(protocols []string) (FilterFunc, error) {
var l4Protocols, l7Protocols []string
for _, p := range protocols {
proto := strings.ToLower(p)
switch proto {
case "icmp", "icmpv4", "icmpv6", "tcp", "udp":
l4Protocols = append(l4Protocols, proto)
case "dns", "http", "kafka":
l7Protocols = append(l7Protocols, proto)
default:
return nil, fmt.Errorf("unkown protocol: %q", p)
}
}
return func(ev *v1.Event) bool {
l4 := ev.GetFlow().GetL4()
for _, proto := range l4Protocols {
switch proto {
case "icmp":
if l4.GetICMPv4() != nil || l4.GetICMPv6() != nil {
return true
}
case "icmpv4":
if l4.GetICMPv4() != nil {
return true
}
case "icmpv6":
if l4.GetICMPv6() != nil {
return true
}
case "tcp":
if l4.GetTCP() != nil {
return true
}
case "udp":
if l4.GetUDP() != nil {
return true
}
}
}
l7 := ev.GetFlow().GetL7()
for _, proto := range l7Protocols {
switch proto {
case "dns":
if l7.GetDns() != nil {
return true
}
case "http":
if l7.GetHttp() != nil {
return true
}
case "kafka":
if l7.GetKafka() != nil {
return true
}
}
}
return false
}, nil
}
// ProtocolFilter implements filtering based on L4 protocol
type ProtocolFilter struct{}
// OnBuildFilter builds a L4 protocol filter
func (p *ProtocolFilter) OnBuildFilter(ctx context.Context, ff *flowpb.FlowFilter) ([]FilterFunc, error) {
var fs []FilterFunc
if ff.GetProtocol() != nil {
pf, err := filterByProtocol(ff.GetProtocol())
if err != nil {
return nil, fmt.Errorf("invalid protocol filter: %v", err)
}
fs = append(fs, pf)
}
return fs, nil
}