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match_builder.go
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match_builder.go
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// Copyright (c) 2016-2018 Tigera, Inc. All rights reserved.
//
// 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 iptables
import (
"fmt"
"math/bits"
"strings"
log "github.com/sirupsen/logrus"
"github.com/projectcalico/felix/proto"
)
type MatchCriteria []string
func Match() MatchCriteria {
return nil
}
func (m MatchCriteria) Render() string {
return strings.Join([]string(m), " ")
}
func (m MatchCriteria) String() string {
return fmt.Sprintf("MatchCriteria[%s]", m.Render())
}
func (m MatchCriteria) MarkClear(mark uint32) MatchCriteria {
if mark == 0 {
log.Panic("Probably bug: zero mark")
}
return append(m, fmt.Sprintf("-m mark --mark 0/%#x", mark))
}
func (m MatchCriteria) MarkNotClear(mark uint32) MatchCriteria {
if mark == 0 {
log.Panic("Probably bug: zero mark")
}
return append(m, fmt.Sprintf("-m mark ! --mark 0/%#x", mark))
}
func (m MatchCriteria) MarkSingleBitSet(mark uint32) MatchCriteria {
if bits.OnesCount32(mark) != 1 {
// Disallow multi-bit matches to force user to think about the mask they should use.
// For example, if you are storing a number in the mark then you likely want to match on its
// 0-bits too
log.WithField("mark", mark).Panic("MarkSingleBitSet() should only be used with a single mark bit")
}
return m.MarkMatchesWithMask(mark, mark)
}
func (m MatchCriteria) MarkMatchesWithMask(mark, mask uint32) MatchCriteria {
logCxt := log.WithFields(log.Fields{
"mark": mark,
"mask": mask,
})
if mask == 0 {
logCxt.Panic("Bug: mask is 0.")
}
if mark&mask != mark {
logCxt.Panic("Bug: mark is not contained in mask")
}
return append(m, fmt.Sprintf("-m mark --mark %#x/%#x", mark, mask))
}
func (m MatchCriteria) NotMarkMatchesWithMask(mark, mask uint32) MatchCriteria {
logCxt := log.WithFields(log.Fields{
"mark": mark,
"mask": mask,
})
if mask == 0 {
logCxt.Panic("Bug: mask is 0.")
}
if mark&mask != mark {
logCxt.Panic("Bug: mark is not contained in mask")
}
return append(m, fmt.Sprintf("-m mark ! --mark %#x/%#x", mark, mask))
}
func (m MatchCriteria) InInterface(ifaceMatch string) MatchCriteria {
return append(m, fmt.Sprintf("--in-interface %s", ifaceMatch))
}
func (m MatchCriteria) OutInterface(ifaceMatch string) MatchCriteria {
return append(m, fmt.Sprintf("--out-interface %s", ifaceMatch))
}
func (m MatchCriteria) RPFCheckPassed() MatchCriteria {
return append(m, "-m rpfilter")
}
func (m MatchCriteria) RPFCheckFailed() MatchCriteria {
return append(m, "-m rpfilter --invert")
}
func (m MatchCriteria) IPVSConnection() MatchCriteria {
return append(m, "-m ipvs --ipvs")
}
func (m MatchCriteria) NotIPVSConnection() MatchCriteria {
return append(m, "-m ipvs ! --ipvs")
}
type AddrType string
const (
AddrTypeLocal AddrType = "LOCAL"
)
func (m MatchCriteria) NotSrcAddrType(addrType AddrType, limitIfaceOut bool) MatchCriteria {
if limitIfaceOut {
return append(m, fmt.Sprintf("-m addrtype ! --src-type %s --limit-iface-out", addrType))
} else {
return append(m, fmt.Sprintf("-m addrtype ! --src-type %s", addrType))
}
}
func (m MatchCriteria) SrcAddrType(addrType AddrType, limitIfaceOut bool) MatchCriteria {
if limitIfaceOut {
return append(m, fmt.Sprintf("-m addrtype --src-type %s --limit-iface-out", addrType))
} else {
return append(m, fmt.Sprintf("-m addrtype --src-type %s", addrType))
}
}
func (m MatchCriteria) DestAddrType(addrType AddrType) MatchCriteria {
return append(m, fmt.Sprintf("-m addrtype --dst-type %s", addrType))
}
func (m MatchCriteria) ConntrackState(stateNames string) MatchCriteria {
return append(m, fmt.Sprintf("-m conntrack --ctstate %s", stateNames))
}
func (m MatchCriteria) Protocol(name string) MatchCriteria {
return append(m, fmt.Sprintf("-p %s", name))
}
func (m MatchCriteria) NotProtocol(name string) MatchCriteria {
return append(m, fmt.Sprintf("! -p %s", name))
}
func (m MatchCriteria) ProtocolNum(num uint8) MatchCriteria {
return append(m, fmt.Sprintf("-p %d", num))
}
func (m MatchCriteria) NotProtocolNum(num uint8) MatchCriteria {
return append(m, fmt.Sprintf("! -p %d", num))
}
func (m MatchCriteria) SourceNet(net string) MatchCriteria {
return append(m, fmt.Sprintf("--source %s", net))
}
func (m MatchCriteria) NotSourceNet(net string) MatchCriteria {
return append(m, fmt.Sprintf("! --source %s", net))
}
func (m MatchCriteria) DestNet(net string) MatchCriteria {
return append(m, fmt.Sprintf("--destination %s", net))
}
func (m MatchCriteria) NotDestNet(net string) MatchCriteria {
return append(m, fmt.Sprintf("! --destination %s", net))
}
func (m MatchCriteria) SourceIPSet(name string) MatchCriteria {
return append(m, fmt.Sprintf("-m set --match-set %s src", name))
}
func (m MatchCriteria) NotSourceIPSet(name string) MatchCriteria {
return append(m, fmt.Sprintf("-m set ! --match-set %s src", name))
}
func (m MatchCriteria) SourceIPPortSet(name string) MatchCriteria {
return append(m, fmt.Sprintf("-m set --match-set %s src,src", name))
}
func (m MatchCriteria) NotSourceIPPortSet(name string) MatchCriteria {
return append(m, fmt.Sprintf("-m set ! --match-set %s src,src", name))
}
func (m MatchCriteria) DestIPSet(name string) MatchCriteria {
return append(m, fmt.Sprintf("-m set --match-set %s dst", name))
}
func (m MatchCriteria) NotDestIPSet(name string) MatchCriteria {
return append(m, fmt.Sprintf("-m set ! --match-set %s dst", name))
}
func (m MatchCriteria) DestIPPortSet(name string) MatchCriteria {
return append(m, fmt.Sprintf("-m set --match-set %s dst,dst", name))
}
func (m MatchCriteria) NotDestIPPortSet(name string) MatchCriteria {
return append(m, fmt.Sprintf("-m set ! --match-set %s dst,dst", name))
}
func (m MatchCriteria) SourcePorts(ports ...uint16) MatchCriteria {
portsString := PortsToMultiport(ports)
return append(m, fmt.Sprintf("-m multiport --source-ports %s", portsString))
}
func (m MatchCriteria) NotSourcePorts(ports ...uint16) MatchCriteria {
portsString := PortsToMultiport(ports)
return append(m, fmt.Sprintf("-m multiport ! --source-ports %s", portsString))
}
func (m MatchCriteria) DestPorts(ports ...uint16) MatchCriteria {
portsString := PortsToMultiport(ports)
return append(m, fmt.Sprintf("-m multiport --destination-ports %s", portsString))
}
func (m MatchCriteria) NotDestPorts(ports ...uint16) MatchCriteria {
portsString := PortsToMultiport(ports)
return append(m, fmt.Sprintf("-m multiport ! --destination-ports %s", portsString))
}
func (m MatchCriteria) SourcePortRanges(ports []*proto.PortRange) MatchCriteria {
portsString := PortRangessToMultiport(ports)
return append(m, fmt.Sprintf("-m multiport --source-ports %s", portsString))
}
func (m MatchCriteria) NotSourcePortRanges(ports []*proto.PortRange) MatchCriteria {
portsString := PortRangessToMultiport(ports)
return append(m, fmt.Sprintf("-m multiport ! --source-ports %s", portsString))
}
func (m MatchCriteria) DestPortRanges(ports []*proto.PortRange) MatchCriteria {
portsString := PortRangessToMultiport(ports)
return append(m, fmt.Sprintf("-m multiport --destination-ports %s", portsString))
}
func (m MatchCriteria) NotDestPortRanges(ports []*proto.PortRange) MatchCriteria {
portsString := PortRangessToMultiport(ports)
return append(m, fmt.Sprintf("-m multiport ! --destination-ports %s", portsString))
}
func (m MatchCriteria) ICMPType(t uint8) MatchCriteria {
return append(m, fmt.Sprintf("-m icmp --icmp-type %d", t))
}
func (m MatchCriteria) NotICMPType(t uint8) MatchCriteria {
return append(m, fmt.Sprintf("-m icmp ! --icmp-type %d", t))
}
func (m MatchCriteria) ICMPTypeAndCode(t, c uint8) MatchCriteria {
return append(m, fmt.Sprintf("-m icmp --icmp-type %d/%d", t, c))
}
func (m MatchCriteria) NotICMPTypeAndCode(t, c uint8) MatchCriteria {
return append(m, fmt.Sprintf("-m icmp ! --icmp-type %d/%d", t, c))
}
func (m MatchCriteria) ICMPV6Type(t uint8) MatchCriteria {
return append(m, fmt.Sprintf("-m icmp6 --icmpv6-type %d", t))
}
func (m MatchCriteria) NotICMPV6Type(t uint8) MatchCriteria {
return append(m, fmt.Sprintf("-m icmp6 ! --icmpv6-type %d", t))
}
func (m MatchCriteria) ICMPV6TypeAndCode(t, c uint8) MatchCriteria {
return append(m, fmt.Sprintf("-m icmp6 --icmpv6-type %d/%d", t, c))
}
func (m MatchCriteria) NotICMPV6TypeAndCode(t, c uint8) MatchCriteria {
return append(m, fmt.Sprintf("-m icmp6 ! --icmpv6-type %d/%d", t, c))
}
func PortsToMultiport(ports []uint16) string {
portFragments := make([]string, len(ports))
for i, port := range ports {
portFragments[i] = fmt.Sprintf("%d", port)
}
portsString := strings.Join(portFragments, ",")
return portsString
}
func PortRangessToMultiport(ports []*proto.PortRange) string {
portFragments := make([]string, len(ports))
for i, port := range ports {
if port.First == port.Last {
portFragments[i] = fmt.Sprintf("%d", port.First)
} else {
portFragments[i] = fmt.Sprintf("%d:%d", port.First, port.Last)
}
}
portsString := strings.Join(portFragments, ",")
return portsString
}