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ip.go
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ip.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"
"net"
"strings"
flowpb "github.com/cilium/cilium/api/v1/flow"
v1 "github.com/cilium/cilium/pkg/hubble/api/v1"
)
func sourceIP(ev *v1.Event) string {
return ev.GetFlow().GetIP().GetSource()
}
func destinationIP(ev *v1.Event) string {
return ev.GetFlow().GetIP().GetDestination()
}
func filterByIPs(ips []string, getIP func(*v1.Event) string) (FilterFunc, error) {
// IP filter can either be an exact match (e.g. "1.1.1.1") or a CIDR range
// (e.g. "1.1.1.0/24"). Put them into 2 separate lists here.
var addresses []string
var cidrs []*net.IPNet
for _, ip := range ips {
if strings.Contains(ip, "/") {
_, ipnet, err := net.ParseCIDR(ip)
if err != nil {
return nil, fmt.Errorf("invalid CIDR in filter: %q", ip)
}
cidrs = append(cidrs, ipnet)
} else {
if net.ParseIP(ip) == nil {
return nil, fmt.Errorf("invalid IP address in filter: %q", ip)
}
addresses = append(addresses, ip)
}
}
return func(ev *v1.Event) bool {
eventIP := getIP(ev)
if eventIP == "" {
return false
}
for _, ip := range addresses {
if ip == eventIP {
return true
}
}
if len(cidrs) > 0 {
parsedIP := net.ParseIP(eventIP)
for _, cidr := range cidrs {
if cidr.Contains(parsedIP) {
return true
}
}
}
return false
}, nil
}
// IPFilter implements IP addressing filtering for the source and destination
// address
type IPFilter struct{}
// OnBuildFilter builds an IP address filter
func (f *IPFilter) OnBuildFilter(ctx context.Context, ff *flowpb.FlowFilter) ([]FilterFunc, error) {
var fs []FilterFunc
if ff.GetSourceIp() != nil {
ipf, err := filterByIPs(ff.GetSourceIp(), sourceIP)
if err != nil {
return nil, err
}
fs = append(fs, ipf)
}
if ff.GetDestinationIp() != nil {
ipf, err := filterByIPs(ff.GetDestinationIp(), destinationIP)
if err != nil {
return nil, err
}
fs = append(fs, ipf)
}
return fs, nil
}
func filterByIPVersion(ipver []flowpb.IPVersion) (FilterFunc, error) {
return func(ev *v1.Event) bool {
flow := ev.GetFlow()
if flow == nil {
return false
}
ver := flow.GetIP().GetIpVersion()
for _, v := range ipver {
if v == ver {
return true
}
}
return false
}, nil
}
// IPVersionFilter implements IP version based filtering
type IPVersionFilter struct{}
// OnBuildFilter builds an IP version filter
func (f *IPVersionFilter) OnBuildFilter(ctx context.Context, ff *flowpb.FlowFilter) ([]FilterFunc, error) {
var fs []FilterFunc
if ff.GetIpVersion() != nil {
pf, err := filterByIPVersion(ff.GetIpVersion())
if err != nil {
return nil, err
}
fs = append(fs, pf)
}
return fs, nil
}