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Add support for excluding source and destination ports in routing rules #67

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bb97909
Add MAC address include/exclude filtering for nftables auto-redirect
nekohasekai Mar 3, 2026
c7ef911
Add support for excluding source and destination ports in routing rules
okhowang Mar 22, 2026
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144 changes: 144 additions & 0 deletions redirect_nftables_rules.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
package tun

import (
"net"
"net/netip"
_ "unsafe"

Expand Down Expand Up @@ -375,6 +376,149 @@ func (r *autoRedirect) nftablesCreateExcludeRules(nft *nftables.Conn, table *nft
})
}
}
if len(r.tunOptions.IncludeMACAddress) > 0 {
nft.AddRule(&nftables.Rule{
Table: table,
Chain: chain,
Exprs: []expr.Any{
&expr.Meta{Key: expr.MetaKeyIIFTYPE, Register: 1},
&expr.Cmp{
Op: expr.CmpOpNeq,
Register: 1,
Data: binaryutil.NativeEndian.PutUint16(unix.ARPHRD_ETHER),
},
&expr.Counter{},
&expr.Verdict{
Kind: expr.VerdictReturn,
},
},
})
if len(r.tunOptions.IncludeMACAddress) > 1 {
includeMACSet := &nftables.Set{
Table: table,
Anonymous: true,
Constant: true,
KeyType: nftables.TypeEtherAddr,
}
err := nft.AddSet(includeMACSet, common.Map(r.tunOptions.IncludeMACAddress, func(it net.HardwareAddr) nftables.SetElement {
return nftables.SetElement{
Key: []byte(it),
}
}))
if err != nil {
return err
}
nft.AddRule(&nftables.Rule{
Table: table,
Chain: chain,
Exprs: []expr.Any{
&expr.Payload{
OperationType: expr.PayloadLoad,
DestRegister: 1,
Base: expr.PayloadBaseLLHeader,
Offset: 6,
Len: 6,
},
&expr.Lookup{
SourceRegister: 1,
SetID: includeMACSet.ID,
SetName: includeMACSet.Name,
Invert: true,
},
&expr.Counter{},
&expr.Verdict{
Kind: expr.VerdictReturn,
},
},
})
} else {
nft.AddRule(&nftables.Rule{
Table: table,
Chain: chain,
Exprs: []expr.Any{
&expr.Payload{
OperationType: expr.PayloadLoad,
DestRegister: 1,
Base: expr.PayloadBaseLLHeader,
Offset: 6,
Len: 6,
},
&expr.Cmp{
Op: expr.CmpOpNeq,
Register: 1,
Data: []byte(r.tunOptions.IncludeMACAddress[0]),
},
&expr.Counter{},
&expr.Verdict{
Kind: expr.VerdictReturn,
},
},
})
}
}
if len(r.tunOptions.ExcludeMACAddress) > 0 {
if len(r.tunOptions.ExcludeMACAddress) > 1 {
excludeMACSet := &nftables.Set{
Table: table,
Anonymous: true,
Constant: true,
KeyType: nftables.TypeEtherAddr,
}
err := nft.AddSet(excludeMACSet, common.Map(r.tunOptions.ExcludeMACAddress, func(it net.HardwareAddr) nftables.SetElement {
return nftables.SetElement{
Key: []byte(it),
}
}))
if err != nil {
return err
}
nft.AddRule(&nftables.Rule{
Table: table,
Chain: chain,
Exprs: []expr.Any{
&expr.Payload{
OperationType: expr.PayloadLoad,
DestRegister: 1,
Base: expr.PayloadBaseLLHeader,
Offset: 6,
Len: 6,
},
&expr.Lookup{
SourceRegister: 1,
SetID: excludeMACSet.ID,
SetName: excludeMACSet.Name,
},
&expr.Counter{},
&expr.Verdict{
Kind: expr.VerdictReturn,
},
},
})
} else {
nft.AddRule(&nftables.Rule{
Table: table,
Chain: chain,
Exprs: []expr.Any{
&expr.Payload{
OperationType: expr.PayloadLoad,
DestRegister: 1,
Base: expr.PayloadBaseLLHeader,
Offset: 6,
Len: 6,
},
&expr.Cmp{
Op: expr.CmpOpEq,
Register: 1,
Data: []byte(r.tunOptions.ExcludeMACAddress[0]),
},
&expr.Counter{},
&expr.Verdict{
Kind: expr.VerdictReturn,
},
},
})
}
}
} else {
if len(r.tunOptions.IncludeUID) > 0 {
if len(r.tunOptions.IncludeUID) > 1 || r.tunOptions.IncludeUID[0].Start != r.tunOptions.IncludeUID[0].End {
Expand Down
4 changes: 4 additions & 0 deletions tun.go
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Original file line number Diff line number Diff line change
Expand Up @@ -99,9 +99,13 @@ type Options struct {
ExcludeInterface []string
IncludeUID []ranges.Range[uint32]
ExcludeUID []ranges.Range[uint32]
ExcludeSrcPort []ranges.Range[uint16]
ExcludeDstPort []ranges.Range[uint16]
IncludeAndroidUser []int
IncludePackage []string
ExcludePackage []string
IncludeMACAddress []net.HardwareAddr
ExcludeMACAddress []net.HardwareAddr
InterfaceFinder control.InterfaceFinder
InterfaceMonitor DefaultInterfaceMonitor
FileDescriptor int
Expand Down
38 changes: 37 additions & 1 deletion tun_linux.go
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Original file line number Diff line number Diff line change
Expand Up @@ -655,6 +655,42 @@ func (t *NativeTun) rules() []*netlink.Rule {
}

nopPriority := ruleStart + 10
for _, excludePort := range t.options.ExcludeSrcPort {
if p4 {
it = netlink.NewRule()
it.Priority = priority
it.Sport = netlink.NewRulePortRange(excludePort.Start, excludePort.End)
it.Goto = nopPriority
it.Family = unix.AF_INET
rules = append(rules, it)
}
if p6 {
it = netlink.NewRule()
it.Priority = priority6
it.Sport = netlink.NewRulePortRange(excludePort.Start, excludePort.End)
it.Goto = nopPriority
it.Family = unix.AF_INET6
rules = append(rules, it)
}
}
for _, excludePort := range t.options.ExcludeDstPort {
if p4 {
it = netlink.NewRule()
it.Priority = priority
it.Dport = netlink.NewRulePortRange(excludePort.Start, excludePort.End)
it.Goto = nopPriority
it.Family = unix.AF_INET
rules = append(rules, it)
}
if p6 {
it = netlink.NewRule()
it.Priority = priority6
it.Dport = netlink.NewRulePortRange(excludePort.Start, excludePort.End)
it.Goto = nopPriority
it.Family = unix.AF_INET6
rules = append(rules, it)
}
}
for _, excludeRange := range excludeRanges {
if p4 {
it = netlink.NewRule()
Expand All @@ -673,7 +709,7 @@ func (t *NativeTun) rules() []*netlink.Rule {
rules = append(rules, it)
}
}
if len(excludeRanges) > 0 {
if len(t.options.ExcludeSrcPort) > 0 || len(t.options.ExcludeDstPort) > 0 || len(excludeRanges) > 0 {
if p4 {
priority++
}
Expand Down