forked from projectcalico/felix
/
nat.go
124 lines (110 loc) · 3.86 KB
/
nat.go
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// Copyright (c) 2016-2017 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 rules
import (
"fmt"
"sort"
"github.com/projectcalico/felix/iptables"
)
func (r *DefaultRuleRenderer) MakeNatOutgoingRule(protocol string, action iptables.Action, ipVersion uint8) iptables.Rule {
ipConf := r.ipSetConfig(ipVersion)
allIPsSetName := ipConf.NameForMainIPSet(IPSetIDNATOutgoingAllPools)
masqIPsSetName := ipConf.NameForMainIPSet(IPSetIDNATOutgoingMasqPools)
match := iptables.Match().
SourceIPSet(masqIPsSetName).
NotDestIPSet(allIPsSetName)
if protocol != "" {
match = match.Protocol(protocol)
}
if r.Config.IptablesNATOutgoingInterfaceFilter != "" {
match = match.OutInterface(r.Config.IptablesNATOutgoingInterfaceFilter)
}
rule := iptables.Rule{
Action: action,
Match: match,
}
return rule
}
func (r *DefaultRuleRenderer) NATOutgoingChain(natOutgoingActive bool, ipVersion uint8) *iptables.Chain {
var rules []iptables.Rule
if natOutgoingActive {
var defaultSnatRule iptables.Action = iptables.MasqAction{}
if r.Config.NATOutgoingAddress != nil {
defaultSnatRule = iptables.SNATAction{ToAddr: r.Config.NATOutgoingAddress.String()}
}
if r.Config.NATPortRange.MaxPort > 0 {
toPorts := fmt.Sprintf("%d-%d", r.Config.NATPortRange.MinPort, r.Config.NATPortRange.MaxPort)
var portRangeSnatRule iptables.Action = iptables.MasqAction{ToPorts: toPorts}
if r.Config.NATOutgoingAddress != nil {
toAddress := fmt.Sprintf("%s:%s", r.Config.NATOutgoingAddress.String(), toPorts)
portRangeSnatRule = iptables.SNATAction{ToAddr: toAddress}
}
rules = []iptables.Rule{
r.MakeNatOutgoingRule("tcp", portRangeSnatRule, ipVersion),
r.MakeNatOutgoingRule("tcp", iptables.ReturnAction{}, ipVersion),
r.MakeNatOutgoingRule("udp", portRangeSnatRule, ipVersion),
r.MakeNatOutgoingRule("udp", iptables.ReturnAction{}, ipVersion),
r.MakeNatOutgoingRule("", defaultSnatRule, ipVersion),
}
} else {
rules = []iptables.Rule{
r.MakeNatOutgoingRule("", defaultSnatRule, ipVersion),
}
}
}
return &iptables.Chain{
Name: ChainNATOutgoing,
Rules: rules,
}
}
func (r *DefaultRuleRenderer) DNATsToIptablesChains(dnats map[string]string) []*iptables.Chain {
// Extract and sort map keys so we can program rules in a determined order.
sortedExtIps := make([]string, 0, len(dnats))
for extIp := range dnats {
sortedExtIps = append(sortedExtIps, extIp)
}
sort.Strings(sortedExtIps)
rules := []iptables.Rule{}
for _, extIp := range sortedExtIps {
intIp := dnats[extIp]
rules = append(rules, iptables.Rule{
Match: iptables.Match().DestNet(extIp),
Action: iptables.DNATAction{DestAddr: intIp},
})
}
return []*iptables.Chain{{
Name: ChainFIPDnat,
Rules: rules,
}}
}
func (r *DefaultRuleRenderer) SNATsToIptablesChains(snats map[string]string) []*iptables.Chain {
// Extract and sort map keys so we can program rules in a determined order.
sortedIntIps := make([]string, 0, len(snats))
for intIp := range snats {
sortedIntIps = append(sortedIntIps, intIp)
}
sort.Strings(sortedIntIps)
rules := []iptables.Rule{}
for _, intIp := range sortedIntIps {
extIp := snats[intIp]
rules = append(rules, iptables.Rule{
Match: iptables.Match().DestNet(intIp).SourceNet(intIp),
Action: iptables.SNATAction{ToAddr: extIp},
})
}
return []*iptables.Chain{{
Name: ChainFIPSnat,
Rules: rules,
}}
}