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util/linuxfw: add nftables support

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This commit adds nftable rule injection for tailscaled. If tailscaled is
started with envknob TS_DEBUG_USE_NETLINK_NFTABLES = true, the router
will use nftables to manage firewall rules.

Updates: #391

Signed-off-by: KevinLiang10 <kevinliang@tailscale.com>
pull/8610/head
KevinLiang10 1 year ago committed by KevinLiang10
parent abcb7ec1ce
commit a3c7b21cd1
7 changed files with 1833 additions and 23 deletions
Show Stats Download Patch File Download Diff File

2
go.mod
Unescape Escape View File

@ -70,6 +70,7 @@ require (
github.com/toqueteos/webbrowser v1.2.0
github.com/u-root/u-root v0.11.0
github.com/vishvananda/netlink v1.2.1-beta.2
github.com/vishvananda/netns v0.0.4
go.uber.org/zap v1.24.0
go4.org/mem v0.0.0-20220726221520-4f986261bf13
go4.org/netipx v0.0.0-20230303233057-f1b76eb4bb35
@ -322,7 +323,6 @@ require (
github.com/ultraware/whitespace v0.0.5 // indirect
github.com/uudashr/gocognit v1.0.6 // indirect
github.com/vbatts/tar-split v0.11.2 // indirect
github.com/vishvananda/netns v0.0.4 // indirect
github.com/x448/float16 v0.8.4 // indirect
github.com/xanzy/ssh-agent v0.3.3 // indirect
github.com/yagipy/maintidx v1.0.0 // indirect

17
util/linuxfw/iptables_runner.go
Unescape Escape View File

@ -8,6 +8,7 @@ package linuxfw
import (
"fmt"
"net/netip"
"os/exec"
"strings"
"github.com/coreos/go-iptables/iptables"
@ -36,6 +37,14 @@ type iptablesRunner struct {
v6NATAvailable bool
}
func checkIP6TablesExists() error {
// Some distros ship ip6tables separately from iptables.
if _, err := exec.LookPath("ip6tables"); err != nil {
return fmt.Errorf("path not found: %w", err)
}
return nil
}
// NewIPTablesRunner constructs a NetfilterRunner that programs iptables rules.
// If the underlying iptables library fails to initialize, that error is
// returned. The runner probes for IPv6 support once at initialization time and
@ -48,9 +57,13 @@ func NewIPTablesRunner(logf logger.Logf) (*iptablesRunner, error) {
supportsV6, supportsV6NAT := false, false
v6err := checkIPv6(logf)
if v6err != nil {
ip6terr := checkIP6TablesExists()
switch {
case v6err != nil:
logf("disabling tunneled IPv6 due to system IPv6 config: %v", v6err)
} else {
case ip6terr != nil:
logf("disabling tunneled IPv6 due to missing ip6tables: %v", ip6terr)
default:
supportsV6 = true
supportsV6NAT = supportsV6 && checkSupportsV6NAT()
logf("v6nat = %v", supportsV6NAT)

33
util/linuxfw/linuxfw.go
Unescape Escape View File

@ -20,6 +20,15 @@ import (
"tailscale.com/types/logger"
)
// MatchDecision is the decision made by the firewall for a packet matched by a rule.
// It is used to decide whether to accept or masquerade a packet in addMatchSubnetRouteMarkRule.
type MatchDecision int
const (
Accept MatchDecision = iota
Masq
)
// The following bits are added to packet marks for Tailscale use.
//
// We tried to pick bits sufficiently out of the way that it's
@ -44,16 +53,12 @@ const (
// We claim bits 16:23 entirely. For now we only use the lower four
// bits, leaving the higher 4 bits for future use.
TailscaleFwmarkMask = "0xff0000"
TailscaleFwmarkMaskNeg = "0xff00ffff"
TailscaleFwmarkMaskNum = 0xff0000
// Packet is from Tailscale and to a subnet route destination, so
// is allowed to be routed through this machine.
TailscaleSubnetRouteMark = "0x40000"
TailscaleSubnetRouteMarkNum = 0x40000
// This one is same value but padded to even number of digit, so
// hex decoding can work correctly.
TailscaleSubnetRouteMarkHexStr = "0x040000"
// Packet was originated by tailscaled itself, and must not be
// routed over the Tailscale network.
@ -61,6 +66,21 @@ const (
TailscaleBypassMarkNum = 0x80000
)
// getTailscaleFwmarkMaskNeg returns the negation of TailscaleFwmarkMask in bytes.
func getTailscaleFwmarkMaskNeg() []byte {
return []byte{0xff, 0x00, 0xff, 0xff}
}
// getTailscaleFwmarkMask returns the TailscaleFwmarkMask in bytes.
func getTailscaleFwmarkMask() []byte {
return []byte{0x00, 0xff, 0x00, 0x00}
}
// getTailscaleSubnetRouteMark returns the TailscaleSubnetRouteMark in bytes.
func getTailscaleSubnetRouteMark() []byte {
return []byte{0x00, 0x04, 0x00, 0x00}
}
// errCode extracts and returns the process exit code from err, or
// zero if err is nil.
func errCode(err error) int {
@ -122,11 +142,6 @@ func checkIPv6(logf logger.Logf) error {
return fmt.Errorf("kernel doesn't support IPv6 policy routing: %w", err)
}
// Some distros ship ip6tables separately from iptables.
if _, err := exec.LookPath("ip6tables"); err != nil {
return err
}
return nil
}

977
util/linuxfw/nftables_runner.go
Unescape Escape View File

@ -0,0 +1,977 @@
// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
//go:build linux
package linuxfw
import (
"encoding/binary"
"encoding/hex"
"errors"
"fmt"
"net"
"net/netip"
"reflect"
"github.com/google/nftables"
"github.com/google/nftables/expr"
"tailscale.com/net/tsaddr"
"tailscale.com/types/logger"
)
const (
chainNameForward = "ts-forward"
chainNameInput = "ts-input"
chainNamePostrouting = "ts-postrouting"
)
type chainInfo struct {
table *nftables.Table
name string
chainType nftables.ChainType
chainHook *nftables.ChainHook
chainPriority *nftables.ChainPriority
}
type nftable struct {
Proto nftables.TableFamily
Filter *nftables.Table
Nat *nftables.Table
}
type nftablesRunner struct {
conn *nftables.Conn
nft4 *nftable
nft6 *nftable
v6Available bool
v6NATAvailable bool
}
// createTableIfNotExist creates a nftables table via connection c if it does not exist within the given family.
func createTableIfNotExist(c *nftables.Conn, family nftables.TableFamily, name string) (*nftables.Table, error) {
tables, err := c.ListTables()
if err != nil {
return nil, fmt.Errorf("get tables: %w", err)
}
for _, table := range tables {
if table.Name == name && table.Family == family {
return table, nil
}
}
t := c.AddTable(&nftables.Table{
Family: family,
Name: name,
})
if err := c.Flush(); err != nil {
return nil, fmt.Errorf("add table: %w", err)
}
return t, nil
}
type errorChainNotFound struct {
chainName string
tableName string
}
func (e errorChainNotFound) Error() string {
return fmt.Sprintf("chain %s not found in table %s", e.chainName, e.tableName)
}
// getChainFromTable returns the chain with the given name from the given table.
// Note that a chain name is unique within a table.
func getChainFromTable(c *nftables.Conn, table *nftables.Table, name string) (*nftables.Chain, error) {
chains, err := c.ListChainsOfTableFamily(table.Family)
if err != nil {
return nil, fmt.Errorf("list chains: %w", err)
}
for _, chain := range chains {
// Table family is already checked so table name is unique
if chain.Table.Name == table.Name && chain.Name == name {
return chain, nil
}
}
return nil, errorChainNotFound{table.Name, name}
}
// getChainsFromTable returns all chains from the given table.
func getChainsFromTable(c *nftables.Conn, table *nftables.Table) ([]*nftables.Chain, error) {
chains, err := c.ListChainsOfTableFamily(table.Family)
if err != nil {
return nil, fmt.Errorf("list chains: %w", err)
}
var ret []*nftables.Chain
for _, chain := range chains {
// Table family is already checked so table name is unique
if chain.Table.Name == table.Name {
ret = append(ret, chain)
}
}
return ret, nil
}
// createChainIfNotExist creates a chain with the given name in the given table
// if it does not exist.
func createChainIfNotExist(c *nftables.Conn, cinfo chainInfo) error {
chain, err := getChainFromTable(c, cinfo.table, cinfo.name)
if err != nil && !errors.Is(err, errorChainNotFound{cinfo.table.Name, cinfo.name}) {
return fmt.Errorf("get chain: %w", err)
} else if err == nil {
// Chain already exists
if chain.Type != cinfo.chainType || chain.Hooknum != cinfo.chainHook || chain.Priority != cinfo.chainPriority {
return fmt.Errorf("chain %s already exists with different type/hook/priority", cinfo.name)
}
return nil
}
_ = c.AddChain(&nftables.Chain{
Name: cinfo.name,
Table: cinfo.table,
Type: cinfo.chainType,
Hooknum: cinfo.chainHook,
Priority: cinfo.chainPriority,
})
if err := c.Flush(); err != nil {
return fmt.Errorf("add chain: %w", err)
}
return nil
}
// NewNfTablesRunner creates a new nftablesRunner without guaranteeing
// the existence of the tables and chains.
func NewNfTablesRunner(logf logger.Logf) (*nftablesRunner, error) {
conn, err := nftables.New()
if err != nil {
return nil, fmt.Errorf("nftables connection: %w", err)
}
nft4 := &nftable{Proto: nftables.TableFamilyIPv4}
v6err := checkIPv6(logf)
if v6err != nil {
logf("disabling tunneled IPv6 due to system IPv6 config: %w", v6err)
}
supportsV6 := v6err == nil
supportsV6NAT := supportsV6 && checkSupportsV6NAT()
var nft6 *nftable
if supportsV6 {
logf("v6nat availability: %v", supportsV6NAT)
nft6 = &nftable{Proto: nftables.TableFamilyIPv6}
}
// TODO(KevinLiang10): convert iptables rule to nftable rules if they exist in the iptables
return &nftablesRunner{
conn: conn,
nft4: nft4,
nft6: nft6,
v6Available: supportsV6,
v6NATAvailable: supportsV6NAT,
}, nil
}
// newLoadSaddrExpr creates a new nftables expression that loads the source
// address of the packet into the given register.
func newLoadSaddrExpr(proto nftables.TableFamily, destReg uint32) (expr.Any, error) {
switch proto {
case nftables.TableFamilyIPv4:
return &expr.Payload{
DestRegister: destReg,
Base: expr.PayloadBaseNetworkHeader,
Offset: 12,
Len: 4,
}, nil
case nftables.TableFamilyIPv6:
return &expr.Payload{
DestRegister: destReg,
Base: expr.PayloadBaseNetworkHeader,
Offset: 8,
Len: 16,
}, nil
default:
return nil, fmt.Errorf("table family %v is neither IPv4 nor IPv6", proto)
}
}
// HasIPV6 returns true if the system supports IPv6.
func (n *nftablesRunner) HasIPV6() bool {
return n.v6Available
}
// HasIPV6NAT returns true if the system supports IPv6 NAT.
func (n *nftablesRunner) HasIPV6NAT() bool {
return n.v6NATAvailable
}
// findRule iterates through the rules to find the rule with matching expressions.
func findRule(conn *nftables.Conn, rule *nftables.Rule) (*nftables.Rule, error) {
rules, err := conn.GetRules(rule.Table, rule.Chain)
if err != nil {
return nil, fmt.Errorf("get nftables rules: %w", err)
}
if len(rules) == 0 {
return nil, nil
}
ruleLoop:
for _, r := range rules {
if len(r.Exprs) != len(rule.Exprs) {
continue
}
for i, e := range r.Exprs {
if !reflect.DeepEqual(e, rule.Exprs[i]) {
continue ruleLoop
}
}
return r, nil
}
return nil, nil
}
func createLoopbackRule(
proto nftables.TableFamily,
table *nftables.Table,
chain *nftables.Chain,
addr netip.Addr,
) (*nftables.Rule, error) {
saddrExpr, err := newLoadSaddrExpr(proto, 1)
if err != nil {
return nil, fmt.Errorf("newLoadSaddrExpr: %w", err)
}
loopBackRule := &nftables.Rule{
Table: table,
Chain: chain,
Exprs: []expr.Any{
&expr.Meta{
Key: expr.MetaKeyIIFNAME,
Register: 1,
},
&expr.Cmp{
Op: expr.CmpOpEq,
Register: 1,
Data: []byte("lo"),
},
saddrExpr,
&expr.Cmp{
Op: expr.CmpOpEq,
Register: 1,
Data: addr.AsSlice(),
},
&expr.Counter{},
&expr.Verdict{
Kind: expr.VerdictAccept,
},
},
}
return loopBackRule, nil
}
// insertLoopbackRule inserts the TS loop back rule into
// the given chain as the first rule if it does not exist.
func insertLoopbackRule(
conn *nftables.Conn, proto nftables.TableFamily,
table *nftables.Table, chain *nftables.Chain, addr netip.Addr) error {
loopBackRule, err := createLoopbackRule(proto, table, chain, addr)
if err != nil {
return fmt.Errorf("create loopback rule: %w", err)
}
// If TestDial is set, we are running in test mode and we should not
// find rule because header will mismatch.
if conn.TestDial == nil {
// Check if the rule already exists.
rule, err := findRule(conn, loopBackRule)
if err != nil {
return fmt.Errorf("find rule: %w", err)
}
if rule != nil {
// Rule already exists, no need to insert.
return nil
}
}
// This inserts the rule to the top of the chain
_ = conn.InsertRule(loopBackRule)
if err = conn.Flush(); err != nil {
return fmt.Errorf("insert rule: %w", err)
}
return nil
}
// getNFTByAddr returns the nftables with correct IP family
// that we will be using for the given address.
func (n *nftablesRunner) getNFTByAddr(addr netip.Addr) *nftable {
if addr.Is6() {
return n.nft6
}
return n.nft4
}
// AddLoopbackRule adds an nftables rule to permit loopback traffic to
// a local Tailscale IP. This rule is added only if it does not already exist.
func (n *nftablesRunner) AddLoopbackRule(addr netip.Addr) error {
nf := n.getNFTByAddr(addr)
inputChain, err := getChainFromTable(n.conn, nf.Filter, chainNameInput)
if err != nil {
return fmt.Errorf("get input chain: %w", err)
}
if err := insertLoopbackRule(n.conn, nf.Proto, nf.Filter, inputChain, addr); err != nil {
return fmt.Errorf("add loopback rule: %w", err)
}
return nil
}
// DelLoopbackRule removes the nftables rule permitting loopback
// traffic to a Tailscale IP.
func (n *nftablesRunner) DelLoopbackRule(addr netip.Addr) error {
nf := n.getNFTByAddr(addr)
inputChain, err := getChainFromTable(n.conn, nf.Filter, chainNameInput)
if err != nil {
return fmt.Errorf("get input chain: %w", err)
}
loopBackRule, err := createLoopbackRule(nf.Proto, nf.Filter, inputChain, addr)
if err != nil {
return fmt.Errorf("create loopback rule: %w", err)
}
existingLoopBackRule, err := findRule(n.conn, loopBackRule)
if err != nil {
return fmt.Errorf("find loop back rule: %w", err)
}
if existingLoopBackRule == nil {
// Rule does not exist, no need to delete.
return nil
}
if err := n.conn.DelRule(existingLoopBackRule); err != nil {
return fmt.Errorf("delete rule: %w", err)
}
return n.conn.Flush()
}
// getTables gets the available nftable in nftables runner.
func (n *nftablesRunner) getTables() []*nftable {
if n.v6Available {
return []*nftable{n.nft4, n.nft6}
}
return []*nftable{n.nft4}
}
// getNATTables gets the available nftable in nftables runner.
// If the system does not support IPv6 NAT, only the IPv4 nftable
// will be returned.
func (n *nftablesRunner) getNATTables() []*nftable {
if n.v6NATAvailable {
return n.getTables()
}
return []*nftable{n.nft4}
}
// AddChains creates custom Tailscale chains in netfilter via nftables
// if the ts-chain doesn't already exist.
func (n *nftablesRunner) AddChains() error {
for _, table := range n.getTables() {
filter, err := createTableIfNotExist(n.conn, table.Proto, "ts-filter")
if err != nil {
return fmt.Errorf("create table: %w", err)
}
table.Filter = filter
if err = createChainIfNotExist(n.conn, chainInfo{filter, chainNameForward, nftables.ChainTypeFilter, nftables.ChainHookForward, nftables.ChainPriorityRef(-1)}); err != nil {
return fmt.Errorf("create forward chain: %w", err)
}
if err = createChainIfNotExist(n.conn, chainInfo{filter, chainNameInput, nftables.ChainTypeFilter, nftables.ChainHookInput, nftables.ChainPriorityRef(-1)}); err != nil {
return fmt.Errorf("create input chain: %w", err)
}
}
for _, table := range n.getNATTables() {
nat, err := createTableIfNotExist(n.conn, table.Proto, "ts-nat")
if err != nil {
return fmt.Errorf("create table: %w", err)
}
table.Nat = nat
if err = createChainIfNotExist(n.conn, chainInfo{nat, chainNamePostrouting, nftables.ChainTypeNAT, nftables.ChainHookPostrouting, nftables.ChainPriorityNATDest}); err != nil {
return fmt.Errorf("create postrouting chain: %w", err)
}
}
return n.conn.Flush()
}
// deleteChainIfExists deletes a chain if it exists.
func deleteChainIfExists(c *nftables.Conn, table *nftables.Table, name string) error {
chain, err := getChainFromTable(c, table, name)
if err != nil && !errors.Is(err, errorChainNotFound{table.Name, name}) {
return fmt.Errorf("get chain: %w", err)
} else if err != nil {
// If the chain doesn't exist, we don't need to delete it.
return nil
}
c.FlushChain(chain)
c.DelChain(chain)
if err := c.Flush(); err != nil {
return fmt.Errorf("flush and delete chain: %w", err)
}
return nil
}
// DelChains removes the custom Tailscale chains from netfilter via nftables.
func (n *nftablesRunner) DelChains() error {
for _, table := range n.getTables() {
if err := deleteChainIfExists(n.conn, table.Filter, chainNameForward); err != nil {
return fmt.Errorf("delete chain: %w", err)
}
if err := deleteChainIfExists(n.conn, table.Filter, chainNameInput); err != nil {
return fmt.Errorf("delete chain: %w", err)
}
n.conn.DelTable(table.Filter)
}
if err := deleteChainIfExists(n.conn, n.nft4.Nat, chainNamePostrouting); err != nil {
return fmt.Errorf("delete chain: %w", err)
}
n.conn.DelTable(n.nft4.Nat)
if n.v6NATAvailable {
if err := deleteChainIfExists(n.conn, n.nft6.Nat, chainNamePostrouting); err != nil {
return fmt.Errorf("delete chain: %w", err)
}
n.conn.DelTable(n.nft6.Nat)
}
if err := n.conn.Flush(); err != nil {
return fmt.Errorf("flush: %w", err)
}
return nil
}
// AddHooks is defined to satisfy the interface. NfTables does not require
// AddHooks, since we don't have any default tables or chains in nftables.
func (n *nftablesRunner) AddHooks() error {
return nil
}
// DelHooks is defined to satisfy the interface. NfTables does not require
// DelHooks, since we don't have any default tables or chains in nftables.
func (n *nftablesRunner) DelHooks(logf logger.Logf) error {
return nil
}
// maskof returns the mask of the given prefix in big endian bytes.
func maskof(pfx netip.Prefix) []byte {
mask := make([]byte, 4)
binary.BigEndian.PutUint32(mask, ^(uint32(0xffff_ffff) >> pfx.Bits()))
return mask
}
// createRangeRule creates a rule that matches packets with source IP from the give
// range (like CGNAT range or ChromeOSVM range) and the interface is not the tunname,
// and makes the given decision. Only IPv4 is supported.
func createRangeRule(
table *nftables.Table, chain *nftables.Chain,
tunname string, rng netip.Prefix, decision expr.VerdictKind,
) (*nftables.Rule, error) {
if rng.Addr().Is6() {
return nil, errors.New("IPv6 is not supported")
}
saddrExpr, err := newLoadSaddrExpr(nftables.TableFamilyIPv4, 1)
if err != nil {
return nil, fmt.Errorf("newLoadSaddrExpr: %w", err)
}
netip := rng.Addr().AsSlice()
mask := maskof(rng)
rule := &nftables.Rule{
Table: table,
Chain: chain,
Exprs: []expr.Any{
&expr.Meta{Key: expr.MetaKeyIIFNAME, Register: 1},
&expr.Cmp{
Op: expr.CmpOpNeq,
Register: 1,
Data: []byte(tunname),
},
saddrExpr,
&expr.Bitwise{
SourceRegister: 1,
DestRegister: 1,
Len: 4,
Mask: mask,
Xor: []byte{0x00, 0x00, 0x00, 0x00},
},
&expr.Cmp{
Op: expr.CmpOpEq,
Register: 1,
Data: netip,
},
&expr.Counter{},
&expr.Verdict{
Kind: decision,
},
},
}
return rule, nil
}
// addReturnChromeOSVMRangeRule adds a rule to return if the source IP
// is in the ChromeOS VM range.
func addReturnChromeOSVMRangeRule(c *nftables.Conn, table *nftables.Table, chain *nftables.Chain, tunname string) error {
rule, err := createRangeRule(table, chain, tunname, tsaddr.ChromeOSVMRange(), expr.VerdictReturn)
if err != nil {
return fmt.Errorf("create rule: %w", err)
}
_ = c.AddRule(rule)
if err = c.Flush(); err != nil {
return fmt.Errorf("add rule: %w", err)
}
return nil
}
// addDropCGNATRangeRule adds a rule to drop if the source IP is in the
// CGNAT range.
func addDropCGNATRangeRule(c *nftables.Conn, table *nftables.Table, chain *nftables.Chain, tunname string) error {
rule, err := createRangeRule(table, chain, tunname, tsaddr.CGNATRange(), expr.VerdictDrop)
if err != nil {
return fmt.Errorf("create rule: %w", err)
}
_ = c.AddRule(rule)
if err = c.Flush(); err != nil {
return fmt.Errorf("add rule: %w", err)
}
return nil
}
// createSetSubnetRouteMarkRule creates a rule to set the subnet route
// mark if the packet is from the given interface.
func createSetSubnetRouteMarkRule(table *nftables.Table, chain *nftables.Chain, tunname string) (*nftables.Rule, error) {
hexTsFwmarkMaskNeg := getTailscaleFwmarkMaskNeg()
hexTSSubnetRouteMark := getTailscaleSubnetRouteMark()
rule := &nftables.Rule{
Table: table,
Chain: chain,
Exprs: []expr.Any{
&expr.Meta{Key: expr.MetaKeyIIFNAME, Register: 1},
&expr.Cmp{
Op: expr.CmpOpEq,
Register: 1,
Data: []byte(tunname),
},
&expr.Counter{},
&expr.Meta{Key: expr.MetaKeyMARK, Register: 1},
&expr.Bitwise{
SourceRegister: 1,
DestRegister: 1,
Len: 4,
Mask: hexTsFwmarkMaskNeg,
Xor: hexTSSubnetRouteMark,
},
&expr.Meta{
Key: expr.MetaKeyMARK,
SourceRegister: true,
Register: 1,
},
},
}
return rule, nil
}
// addSetSubnetRouteMarkRule adds a rule to set the subnet route mark
// if the packet is from the given interface.
func addSetSubnetRouteMarkRule(c *nftables.Conn, table *nftables.Table, chain *nftables.Chain, tunname string) error {
rule, err := createSetSubnetRouteMarkRule(table, chain, tunname)
if err != nil {
return fmt.Errorf("create rule: %w", err)
}
_ = c.AddRule(rule)
if err := c.Flush(); err != nil {
return fmt.Errorf("add rule: %w", err)
}
return nil
}
// createDropOutgoingPacketFromCGNATRangeRuleWithTunname creates a rule to drop
// outgoing packets from the CGNAT range.
func createDropOutgoingPacketFromCGNATRangeRuleWithTunname(table *nftables.Table, chain *nftables.Chain, tunname string) (*nftables.Rule, error) {
_, ipNet, err := net.ParseCIDR(tsaddr.CGNATRange().String())
if err != nil {
return nil, fmt.Errorf("parse cidr: %v", err)
}
mask, err := hex.DecodeString(ipNet.Mask.String())
if err != nil {
return nil, fmt.Errorf("decode mask: %v", err)
}
netip := ipNet.IP.Mask(ipNet.Mask).To4()
saddrExpr, err := newLoadSaddrExpr(nftables.TableFamilyIPv4, 1)
if err != nil {
return nil, fmt.Errorf("newLoadSaddrExpr: %v", err)
}
rule := &nftables.Rule{
Table: table,
Chain: chain,
Exprs: []expr.Any{
&expr.Meta{Key: expr.MetaKeyOIFNAME, Register: 1},
&expr.Cmp{
Op: expr.CmpOpEq,
Register: 1,
Data: []byte(tunname),
},
saddrExpr,
&expr.Bitwise{
SourceRegister: 1,
DestRegister: 1,
Len: 4,
Mask: mask,
Xor: []byte{0x00, 0x00, 0x00, 0x00},
},
&expr.Cmp{
Op: expr.CmpOpEq,
Register: 1,
Data: netip,
},
&expr.Counter{},
&expr.Verdict{
Kind: expr.VerdictDrop,
},
},
}
return rule, nil
}
// addDropOutgoingPacketFromCGNATRangeRuleWithTunname adds a rule to drop
// outgoing packets from the CGNAT range.
func addDropOutgoingPacketFromCGNATRangeRuleWithTunname(conn *nftables.Conn, table *nftables.Table, chain *nftables.Chain, tunname string) error {
rule, err := createDropOutgoingPacketFromCGNATRangeRuleWithTunname(table, chain, tunname)
if err != nil {
return fmt.Errorf("create rule: %w", err)
}
_ = conn.AddRule(rule)
if err := conn.Flush(); err != nil {
return fmt.Errorf("add rule: %w", err)
}
return nil
}
// createAcceptOutgoingPacketRule creates a rule to accept outgoing packets
// from the given interface.
func createAcceptOutgoingPacketRule(table *nftables.Table, chain *nftables.Chain, tunname string) *nftables.Rule {
return &nftables.Rule{
Table: table,
Chain: chain,
Exprs: []expr.Any{
&expr.Meta{Key: expr.MetaKeyOIFNAME, Register: 1},
&expr.Cmp{
Op: expr.CmpOpEq,
Register: 1,
Data: []byte(tunname),
},
&expr.Counter{},
&expr.Verdict{
Kind: expr.VerdictAccept,
},
},
}
}
// addAcceptOutgoingPacketRule adds a rule to accept outgoing packets
// from the given interface.
func addAcceptOutgoingPacketRule(conn *nftables.Conn, table *nftables.Table, chain *nftables.Chain, tunname string) error {
rule := createAcceptOutgoingPacketRule(table, chain, tunname)
_ = conn.AddRule(rule)
if err := conn.Flush(); err != nil {
return fmt.Errorf("flush add rule: %w", err)
}
return nil
}
// AddBase adds some basic processing rules.
func (n *nftablesRunner) AddBase(tunname string) error {
if err := n.addBase4(tunname); err != nil {
return fmt.Errorf("add base v4: %w", err)
}
if n.HasIPV6() {
if err := n.addBase6(tunname); err != nil {
return fmt.Errorf("add base v6: %w", err)
}
}
return nil
}
// addBase4 adds some basic IPv4 processing rules.
func (n *nftablesRunner) addBase4(tunname string) error {
conn := n.conn
inputChain, err := getChainFromTable(conn, n.nft4.Filter, chainNameInput)
if err != nil {
return fmt.Errorf("get input chain v4: %v", err)
}
if err = addReturnChromeOSVMRangeRule(conn, n.nft4.Filter, inputChain, tunname); err != nil {
return fmt.Errorf("add return chromeos vm range rule v4: %w", err)
}
if err = addDropCGNATRangeRule(conn, n.nft4.Filter, inputChain, tunname); err != nil {
return fmt.Errorf("add drop cgnat range rule v4: %w", err)
}
forwardChain, err := getChainFromTable(conn, n.nft4.Filter, chainNameForward)
if err != nil {
return fmt.Errorf("get forward chain v4: %v", err)
}
if err = addSetSubnetRouteMarkRule(conn, n.nft4.Filter, forwardChain, tunname); err != nil {
return fmt.Errorf("add set subnet route mark rule v4: %w", err)
}
if err = addMatchSubnetRouteMarkRule(conn, n.nft4.Filter, forwardChain, Accept); err != nil {
return fmt.Errorf("add match subnet route mark rule v4: %w", err)
}
if err = addDropOutgoingPacketFromCGNATRangeRuleWithTunname(conn, n.nft4.Filter, forwardChain, tunname); err != nil {
return fmt.Errorf("add drop outgoing packet from cgnat range rule v4: %w", err)
}
if err = addAcceptOutgoingPacketRule(conn, n.nft4.Filter, forwardChain, tunname); err != nil {
return fmt.Errorf("add accept outgoing packet rule v4: %w", err)
}
if err = conn.Flush(); err != nil {
return fmt.Errorf("flush base v4: %w", err)
}
return nil
}
// addBase6 adds some basic IPv6 processing rules.
func (n *nftablesRunner) addBase6(tunname string) error {
conn := n.conn
forwardChain, err := getChainFromTable(conn, n.nft6.Filter, chainNameForward)
if err != nil {
return fmt.Errorf("get forward chain v6: %w", err)
}
if err = addSetSubnetRouteMarkRule(conn, n.nft6.Filter, forwardChain, tunname); err != nil {
return fmt.Errorf("add set subnet route mark rule v6: %w", err)
}
if err = addMatchSubnetRouteMarkRule(conn, n.nft6.Filter, forwardChain, Accept); err != nil {
return fmt.Errorf("add match subnet route mark rule v6: %w", err)
}
if err = addAcceptOutgoingPacketRule(conn, n.nft6.Filter, forwardChain, tunname); err != nil {
return fmt.Errorf("add accept outgoing packet rule v6: %w", err)
}
if err = conn.Flush(); err != nil {
return fmt.Errorf("flush base v6: %w", err)
}
return nil
}
// DelBase empties, but does not remove, custom Tailscale chains from
// netfilter via iptables.
func (n *nftablesRunner) DelBase() error {
conn := n.conn
for _, table := range n.getTables() {
inputChain, err := getChainFromTable(conn, table.Filter, chainNameInput)
if err != nil {
return fmt.Errorf("get input chain: %v", err)
}
conn.FlushChain(inputChain)
forwardChain, err := getChainFromTable(conn, table.Filter, chainNameForward)
if err != nil {
return fmt.Errorf("get forward chain: %v", err)
}
conn.FlushChain(forwardChain)
}
for _, table := range n.getNATTables() {
postrouteChain, err := getChainFromTable(conn, table.Nat, chainNamePostrouting)
if err != nil {
return fmt.Errorf("get postrouting chain v4: %v", err)
}
conn.FlushChain(postrouteChain)
}
return conn.Flush()
}
// createMatchSubnetRouteMarkRule creates a rule that matches packets
// with the subnet route mark and takes the specified action.
func createMatchSubnetRouteMarkRule(table *nftables.Table, chain *nftables.Chain, action MatchDecision) (*nftables.Rule, error) {
hexTSFwmarkMask := getTailscaleFwmarkMask()
hexTSSubnetRouteMark := getTailscaleSubnetRouteMark()
var endAction expr.Any
endAction = &expr.Verdict{Kind: expr.VerdictAccept}
if action == Masq {
endAction = &expr.Masq{}
}
exprs := []expr.Any{
&expr.Meta{Key: expr.MetaKeyMARK, Register: 1},
&expr.Bitwise{
SourceRegister: 1,
DestRegister: 1,
Len: 4,
Mask: hexTSFwmarkMask,
Xor: []byte{0x00, 0x00, 0x00, 0x00},
},
&expr.Cmp{
Op: expr.CmpOpEq,
Register: 1,
Data: hexTSSubnetRouteMark,
},
&expr.Counter{},
endAction,
}
rule := &nftables.Rule{
Table: table,
Chain: chain,
Exprs: exprs,
}
return rule, nil
}
// addMatchSubnetRouteMarkRule adds a rule that matches packets with
// the subnet route mark and takes the specified action.
func addMatchSubnetRouteMarkRule(conn *nftables.Conn, table *nftables.Table, chain *nftables.Chain, action MatchDecision) error {
rule, err := createMatchSubnetRouteMarkRule(table, chain, action)
if err != nil {
return fmt.Errorf("create match subnet route mark rule: %w", err)
}
_ = conn.AddRule(rule)
if err := conn.Flush(); err != nil {
return fmt.Errorf("flush add rule: %w", err)
}
return nil
}
// AddSNATRule adds a netfilter rule to SNAT traffic destined for
// local subnets.
func (n *nftablesRunner) AddSNATRule() error {
conn := n.conn
for _, table := range n.getNATTables() {
chain, err := getChainFromTable(conn, table.Nat, chainNamePostrouting)
if err != nil {
return fmt.Errorf("get postrouting chain v4: %w", err)
}
if err = addMatchSubnetRouteMarkRule(conn, table.Nat, chain, Masq); err != nil {
return fmt.Errorf("add match subnet route mark rule v4: %w", err)
}
}
if err := conn.Flush(); err != nil {
return fmt.Errorf("flush add SNAT rule: %w", err)
}
return nil
}
// DelSNATRule removes the netfilter rule to SNAT traffic destined for
// local subnets. An error is returned if the rule does not exist.
func (n *nftablesRunner) DelSNATRule() error {
conn := n.conn
hexTSFwmarkMask := getTailscaleFwmarkMask()
hexTSSubnetRouteMark := getTailscaleSubnetRouteMark()
exprs := []expr.Any{
&expr.Meta{Key: expr.MetaKeyMARK, Register: 1},
&expr.Bitwise{
SourceRegister: 1,
DestRegister: 1,
Len: 4,
Mask: hexTSFwmarkMask,
},
&expr.Cmp{
Op: expr.CmpOpEq,
Register: 1,
Data: hexTSSubnetRouteMark,
},
&expr.Counter{},
&expr.Masq{},
}
for _, table := range n.getNATTables() {
chain, err := getChainFromTable(conn, table.Nat, chainNamePostrouting)
if err != nil {
return fmt.Errorf("get postrouting chain v4: %w", err)
}
rule := &nftables.Rule{
Table: table.Nat,
Chain: chain,
Exprs: exprs,
}
SNATRule, err := findRule(conn, rule)
if err != nil {
return fmt.Errorf("find SNAT rule v4: %w", err)
}
_ = conn.DelRule(SNATRule)
}
if err := conn.Flush(); err != nil {
return fmt.Errorf("flush del SNAT rule: %w", err)
}
return nil
}
// NfTablesCleanUp removes all Tailscale added nftables rules.
// Any errors that occur are logged to the provided logf.
func NfTablesCleanUp(logf logger.Logf) {
conn, err := nftables.New()
if err != nil {
logf("ERROR: nftables connection: %w", err)
}
tables, err := conn.ListTables() // both v4 and v6
if err != nil {
logf("ERROR: list tables: %w", err)
}
for _, table := range tables {
if table.Name == "ts-filter" || table.Name == "ts-nat" {
conn.DelTable(table)
if err := conn.Flush(); err != nil {
logf("ERROR: flush table %s: %w", table.Name, err)
}
}
}
}

790
util/linuxfw/nftables_runner_test.go
Unescape Escape View File

@ -0,0 +1,790 @@
// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
//go:build linux
package linuxfw
import (
"bytes"
"fmt"
"net/netip"
"os"
"runtime"
"strings"
"testing"
"github.com/google/nftables"
"github.com/google/nftables/expr"
"github.com/mdlayher/netlink"
"github.com/vishvananda/netns"
"tailscale.com/net/tsaddr"
)
// nfdump returns a hexdump of 4 bytes per line (like nft --debug=all), allowing
// users to make sense of large byte literals more easily.
func nfdump(b []byte) string {
var buf bytes.Buffer
i := 0
for ; i < len(b); i += 4 {
// TODO: show printable characters as ASCII
fmt.Fprintf(&buf, "%02x %02x %02x %02x\n",
b[i],
b[i+1],
b[i+2],
b[i+3])
}
for ; i < len(b); i++ {
fmt.Fprintf(&buf, "%02x ", b[i])
}
return buf.String()
}
func TestMaskof(t *testing.T) {
pfx, err := netip.ParsePrefix("192.168.1.0/24")
if err != nil {
t.Fatal(err)
}
want := []byte{0xff, 0xff, 0xff, 0x00}
if got := maskof(pfx); !bytes.Equal(got, want) {
t.Errorf("got %v; want %v", got, want)
}
}
// linediff returns a side-by-side diff of two nfdump() return values, flagging
// lines which are not equal with an exclamation point prefix.
func linediff(a, b string) string {
var buf bytes.Buffer
fmt.Fprintf(&buf, "got -- want\n")
linesA := strings.Split(a, "\n")
linesB := strings.Split(b, "\n")
for idx, lineA := range linesA {
if idx >= len(linesB) {
break
}
lineB := linesB[idx]
prefix := "! "
if lineA == lineB {
prefix = " "
}
fmt.Fprintf(&buf, "%s%s -- %s\n", prefix, lineA, lineB)
}
return buf.String()
}
func newTestConn(t *testing.T, want [][]byte) *nftables.Conn {
conn, err := nftables.New(nftables.WithTestDial(
func(req []netlink.Message) ([]netlink.Message, error) {
for idx, msg := range req {
b, err := msg.MarshalBinary()
if err != nil {
t.Fatal(err)
}
if len(b) < 16 {
continue
}
b = b[16:]
if len(want) == 0 {
t.Errorf("no want entry for message %d: %x", idx, b)
continue
}
if got, want := b, want[0]; !bytes.Equal(got, want) {
t.Errorf("message %d: %s", idx, linediff(nfdump(got), nfdump(want)))
}
want = want[1:]
}
return req, nil
}))
if err != nil {
t.Fatal(err)
}
return conn
}
func TestInsertLoopbackRule(t *testing.T) {
proto := nftables.TableFamilyIPv4
want := [][]byte{
// batch begin
[]byte("\x00\x00\x00\x0a"),
// nft add table ip ts-filter-test
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x08\x00\x02\x00\x00\x00\x00\x00"),
// nft add chain ip ts-filter-test ts-input-test { type filter hook input priority 0 \; }
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x12\x00\x03\x00\x74\x73\x2d\x69\x6e\x70\x75\x74\x2d\x74\x65\x73\x74\x00\x00\x00\x14\x00\x04\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x0b\x00\x07\x00\x66\x69\x6c\x74\x65\x72\x00\x00"),
// nft add rule ip ts-filter-test ts-input-test iifname "lo" ip saddr 192.168.0.2 counter accept
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x12\x00\x02\x00\x74\x73\x2d\x69\x6e\x70\x75\x74\x2d\x74\x65\x73\x74\x00\x00\x00\x10\x01\x04\x80\x24\x00\x01\x80\x09\x00\x01\x00\x6d\x65\x74\x61\x00\x00\x00\x00\x14\x00\x02\x80\x08\x00\x02\x00\x00\x00\x00\x06\x08\x00\x01\x00\x00\x00\x00\x01\x2c\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x20\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x0c\x00\x03\x80\x06\x00\x01\x00\x6c\x6f\x00\x00\x34\x00\x01\x80\x0c\x00\x01\x00\x70\x61\x79\x6c\x6f\x61\x64\x00\x24\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x08\x00\x03\x00\x00\x00\x00\x0c\x08\x00\x04\x00\x00\x00\x00\x04\x2c\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x20\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x0c\x00\x03\x80\x08\x00\x01\x00\xc0\xa8\x00\x02\x2c\x00\x01\x80\x0c\x00\x01\x00\x63\x6f\x75\x6e\x74\x65\x72\x00\x1c\x00\x02\x80\x0c\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0c\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x30\x00\x01\x80\x0e\x00\x01\x00\x69\x6d\x6d\x65\x64\x69\x61\x74\x65\x00\x00\x00\x1c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x00\x10\x00\x02\x80\x0c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01"),
// batch end
[]byte("\x00\x00\x00\x0a"),
}
testConn := newTestConn(t, want)
table := testConn.AddTable(&nftables.Table{
Family: proto,
Name: "ts-filter-test",
})
chain := testConn.AddChain(&nftables.Chain{
Name: "ts-input-test",
Table: table,
Type: nftables.ChainTypeFilter,
Hooknum: nftables.ChainHookInput,
Priority: nftables.ChainPriorityFilter,
})
addr := netip.MustParseAddr("192.168.0.2")
err := insertLoopbackRule(testConn, proto, table, chain, addr)
if err != nil {
t.Fatal(err)
}
}
func TestInsertLoopbackRuleV6(t *testing.T) {
protoV6 := nftables.TableFamilyIPv6
want := [][]byte{
// batch begin
[]byte("\x00\x00\x00\x0a"),
// nft add table ip6 ts-filter-test
[]byte("\x0a\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x08\x00\x02\x00\x00\x00\x00\x00"),
// nft add chain ip6 ts-filter-test ts-input-test { type filter hook input priority 0\; }
[]byte("\x0a\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x12\x00\x03\x00\x74\x73\x2d\x69\x6e\x70\x75\x74\x2d\x74\x65\x73\x74\x00\x00\x00\x14\x00\x04\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x0b\x00\x07\x00\x66\x69\x6c\x74\x65\x72\x00\x00"),
// nft add rule ip6 ts-filter-test ts-input-test iifname "lo" ip6 addr 2001:db8::1 counter accept
[]byte("\x0a\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x12\x00\x02\x00\x74\x73\x2d\x69\x6e\x70\x75\x74\x2d\x74\x65\x73\x74\x00\x00\x00\x1c\x01\x04\x80\x24\x00\x01\x80\x09\x00\x01\x00\x6d\x65\x74\x61\x00\x00\x00\x00\x14\x00\x02\x80\x08\x00\x02\x00\x00\x00\x00\x06\x08\x00\x01\x00\x00\x00\x00\x01\x2c\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x20\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x0c\x00\x03\x80\x06\x00\x01\x00\x6c\x6f\x00\x00\x34\x00\x01\x80\x0c\x00\x01\x00\x70\x61\x79\x6c\x6f\x61\x64\x00\x24\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x08\x00\x03\x00\x00\x00\x00\x08\x08\x00\x04\x00\x00\x00\x00\x10\x38\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x2c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x18\x00\x03\x80\x14\x00\x01\x00\x20\x01\x0d\xb8\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x2c\x00\x01\x80\x0c\x00\x01\x00\x63\x6f\x75\x6e\x74\x65\x72\x00\x1c\x00\x02\x80\x0c\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0c\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x30\x00\x01\x80\x0e\x00\x01\x00\x69\x6d\x6d\x65\x64\x69\x61\x74\x65\x00\x00\x00\x1c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x00\x10\x00\x02\x80\x0c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01"),
// batch end
[]byte("\x00\x00\x00\x0a"),
}
testConn := newTestConn(t, want)
tableV6 := testConn.AddTable(&nftables.Table{
Family: protoV6,
Name: "ts-filter-test",
})
chainV6 := testConn.AddChain(&nftables.Chain{
Name: "ts-input-test",
Table: tableV6,
Type: nftables.ChainTypeFilter,
Hooknum: nftables.ChainHookInput,
Priority: nftables.ChainPriorityFilter,
})
addrV6 := netip.MustParseAddr("2001:db8::1")
err := insertLoopbackRule(testConn, protoV6, tableV6, chainV6, addrV6)
if err != nil {
t.Fatal(err)
}
}
func TestAddReturnChromeOSVMRangeRule(t *testing.T) {
proto := nftables.TableFamilyIPv4
want := [][]byte{
// batch begin
[]byte("\x00\x00\x00\x0a"),
// nft add table ip ts-filter-test
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x08\x00\x02\x00\x00\x00\x00\x00"),
// nft add chain ip ts-filter-test ts-input-test { type filter hook input priority 0\; }
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x12\x00\x03\x00\x74\x73\x2d\x69\x6e\x70\x75\x74\x2d\x74\x65\x73\x74\x00\x00\x00\x14\x00\x04\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x0b\x00\x07\x00\x66\x69\x6c\x74\x65\x72\x00\x00"),
// nft add rule ip ts-filter-test ts-input-test iifname != "testTunn" ip saddr 100.115.92.0/23 counter return
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x12\x00\x02\x00\x74\x73\x2d\x69\x6e\x70\x75\x74\x2d\x74\x65\x73\x74\x00\x00\x00\x58\x01\x04\x80\x24\x00\x01\x80\x09\x00\x01\x00\x6d\x65\x74\x61\x00\x00\x00\x00\x14\x00\x02\x80\x08\x00\x02\x00\x00\x00\x00\x06\x08\x00\x01\x00\x00\x00\x00\x01\x30\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x24\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x10\x00\x03\x80\x0c\x00\x01\x00\x74\x65\x73\x74\x54\x75\x6e\x6e\x34\x00\x01\x80\x0c\x00\x01\x00\x70\x61\x79\x6c\x6f\x61\x64\x00\x24\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x08\x00\x03\x00\x00\x00\x00\x0c\x08\x00\x04\x00\x00\x00\x00\x04\x44\x00\x01\x80\x0c\x00\x01\x00\x62\x69\x74\x77\x69\x73\x65\x00\x34\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x08\x00\x03\x00\x00\x00\x00\x04\x0c\x00\x04\x80\x08\x00\x01\x00\xff\xff\xfe\x00\x0c\x00\x05\x80\x08\x00\x01\x00\x00\x00\x00\x00\x2c\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x20\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x0c\x00\x03\x80\x08\x00\x01\x00\x64\x73\x5c\x00\x2c\x00\x01\x80\x0c\x00\x01\x00\x63\x6f\x75\x6e\x74\x65\x72\x00\x1c\x00\x02\x80\x0c\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0c\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x30\x00\x01\x80\x0e\x00\x01\x00\x69\x6d\x6d\x65\x64\x69\x61\x74\x65\x00\x00\x00\x1c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x00\x10\x00\x02\x80\x0c\x00\x02\x80\x08\x00\x01\x00\xff\xff\xff\xfb"),
// batch end
[]byte("\x00\x00\x00\x0a"),
}
testConn := newTestConn(t, want)
table := testConn.AddTable(&nftables.Table{
Family: proto,
Name: "ts-filter-test",
})
chain := testConn.AddChain(&nftables.Chain{
Name: "ts-input-test",
Table: table,
Type: nftables.ChainTypeFilter,
Hooknum: nftables.ChainHookInput,
Priority: nftables.ChainPriorityFilter,
})
err := addReturnChromeOSVMRangeRule(testConn, table, chain, "testTunn")
if err != nil {
t.Fatal(err)
}
}
func TestAddDropCGNATRangeRule(t *testing.T) {
proto := nftables.TableFamilyIPv4
want := [][]byte{
// batch begin
[]byte("\x00\x00\x00\x0a"),
// nft add table ip ts-filter-test
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x08\x00\x02\x00\x00\x00\x00\x00"),
// nft add chain ip ts-filter-test ts-input-test { type filter hook input priority filter; }
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x12\x00\x03\x00\x74\x73\x2d\x69\x6e\x70\x75\x74\x2d\x74\x65\x73\x74\x00\x00\x00\x14\x00\x04\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x0b\x00\x07\x00\x66\x69\x6c\x74\x65\x72\x00\x00"),
// nft add rule ip ts-filter-test ts-input-test iifname != "testTunn" ip saddr 100.64.0.0/10 counter drop
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x12\x00\x02\x00\x74\x73\x2d\x69\x6e\x70\x75\x74\x2d\x74\x65\x73\x74\x00\x00\x00\x58\x01\x04\x80\x24\x00\x01\x80\x09\x00\x01\x00\x6d\x65\x74\x61\x00\x00\x00\x00\x14\x00\x02\x80\x08\x00\x02\x00\x00\x00\x00\x06\x08\x00\x01\x00\x00\x00\x00\x01\x30\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x24\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x10\x00\x03\x80\x0c\x00\x01\x00\x74\x65\x73\x74\x54\x75\x6e\x6e\x34\x00\x01\x80\x0c\x00\x01\x00\x70\x61\x79\x6c\x6f\x61\x64\x00\x24\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x08\x00\x03\x00\x00\x00\x00\x0c\x08\x00\x04\x00\x00\x00\x00\x04\x44\x00\x01\x80\x0c\x00\x01\x00\x62\x69\x74\x77\x69\x73\x65\x00\x34\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x08\x00\x03\x00\x00\x00\x00\x04\x0c\x00\x04\x80\x08\x00\x01\x00\xff\xc0\x00\x00\x0c\x00\x05\x80\x08\x00\x01\x00\x00\x00\x00\x00\x2c\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x20\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x0c\x00\x03\x80\x08\x00\x01\x00\x64\x40\x00\x00\x2c\x00\x01\x80\x0c\x00\x01\x00\x63\x6f\x75\x6e\x74\x65\x72\x00\x1c\x00\x02\x80\x0c\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0c\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x30\x00\x01\x80\x0e\x00\x01\x00\x69\x6d\x6d\x65\x64\x69\x61\x74\x65\x00\x00\x00\x1c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x00\x10\x00\x02\x80\x0c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x00"),
// batch end
[]byte("\x00\x00\x00\x0a"),
}
testConn := newTestConn(t, want)
table := testConn.AddTable(&nftables.Table{
Family: proto,
Name: "ts-filter-test",
})
chain := testConn.AddChain(&nftables.Chain{
Name: "ts-input-test",
Table: table,
Type: nftables.ChainTypeFilter,
Hooknum: nftables.ChainHookInput,
Priority: nftables.ChainPriorityFilter,
})
err := addDropCGNATRangeRule(testConn, table, chain, "testTunn")
if err != nil {
t.Fatal(err)
}
}
func TestAddSetSubnetRouteMarkRule(t *testing.T) {
proto := nftables.TableFamilyIPv4
want := [][]byte{
// batch begin
[]byte("\x00\x00\x00\x0a"),
// nft add table ip ts-filter-test
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x08\x00\x02\x00\x00\x00\x00\x00"),
// nft add chain ip ts-filter-test ts-forward-test { type filter hook forward priority 0\; }
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x14\x00\x03\x00\x74\x73\x2d\x66\x6f\x72\x77\x61\x72\x64\x2d\x74\x65\x73\x74\x00\x14\x00\x04\x80\x08\x00\x01\x00\x00\x00\x00\x02\x08\x00\x02\x00\x00\x00\x00\x00\x0b\x00\x07\x00\x66\x69\x6c\x74\x65\x72\x00\x00"),
// nft add rule ip ts-filter-test ts-forward-test iifname "testTunn" counter meta mark set mark and 0xff00ffff xor 0x40000
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x14\x00\x02\x00\x74\x73\x2d\x66\x6f\x72\x77\x61\x72\x64\x2d\x74\x65\x73\x74\x00\x10\x01\x04\x80\x24\x00\x01\x80\x09\x00\x01\x00\x6d\x65\x74\x61\x00\x00\x00\x00\x14\x00\x02\x80\x08\x00\x02\x00\x00\x00\x00\x06\x08\x00\x01\x00\x00\x00\x00\x01\x30\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x24\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x10\x00\x03\x80\x0c\x00\x01\x00\x74\x65\x73\x74\x54\x75\x6e\x6e\x2c\x00\x01\x80\x0c\x00\x01\x00\x63\x6f\x75\x6e\x74\x65\x72\x00\x1c\x00\x02\x80\x0c\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0c\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x24\x00\x01\x80\x09\x00\x01\x00\x6d\x65\x74\x61\x00\x00\x00\x00\x14\x00\x02\x80\x08\x00\x02\x00\x00\x00\x00\x03\x08\x00\x01\x00\x00\x00\x00\x01\x44\x00\x01\x80\x0c\x00\x01\x00\x62\x69\x74\x77\x69\x73\x65\x00\x34\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x08\x00\x03\x00\x00\x00\x00\x04\x0c\x00\x04\x80\x08\x00\x01\x00\xff\x00\xff\xff\x0c\x00\x05\x80\x08\x00\x01\x00\x00\x04\x00\x00\x24\x00\x01\x80\x09\x00\x01\x00\x6d\x65\x74\x61\x00\x00\x00\x00\x14\x00\x02\x80\x08\x00\x02\x00\x00\x00\x00\x03\x08\x00\x03\x00\x00\x00\x00\x01"),
// batch end
[]byte("\x00\x00\x00\x0a"),
}
testConn := newTestConn(t, want)
table := testConn.AddTable(&nftables.Table{
Family: proto,
Name: "ts-filter-test",
})
chain := testConn.AddChain(&nftables.Chain{
Name: "ts-forward-test",
Table: table,
Type: nftables.ChainTypeFilter,
Hooknum: nftables.ChainHookForward,
Priority: nftables.ChainPriorityFilter,
})
err := addSetSubnetRouteMarkRule(testConn, table, chain, "testTunn")
if err != nil {
t.Fatal(err)
}
}
func TestAddDropOutgoingPacketFromCGNATRangeRuleWithTunname(t *testing.T) {
proto := nftables.TableFamilyIPv4
want := [][]byte{
// batch begin
[]byte("\x00\x00\x00\x0a"),
// nft add table ip ts-filter-test
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x08\x00\x02\x00\x00\x00\x00\x00"),
// nft add chain ip ts-filter-test ts-forward-test { type filter hook forward priority 0\; }
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x14\x00\x03\x00\x74\x73\x2d\x66\x6f\x72\x77\x61\x72\x64\x2d\x74\x65\x73\x74\x00\x14\x00\x04\x80\x08\x00\x01\x00\x00\x00\x00\x02\x08\x00\x02\x00\x00\x00\x00\x00\x0b\x00\x07\x00\x66\x69\x6c\x74\x65\x72\x00\x00"),
// nft add rule ip ts-filter-test ts-forward-test oifname "testTunn" ip saddr 100.64.0.0/10 counter drop
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x14\x00\x02\x00\x74\x73\x2d\x66\x6f\x72\x77\x61\x72\x64\x2d\x74\x65\x73\x74\x00\x58\x01\x04\x80\x24\x00\x01\x80\x09\x00\x01\x00\x6d\x65\x74\x61\x00\x00\x00\x00\x14\x00\x02\x80\x08\x00\x02\x00\x00\x00\x00\x07\x08\x00\x01\x00\x00\x00\x00\x01\x30\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x24\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x10\x00\x03\x80\x0c\x00\x01\x00\x74\x65\x73\x74\x54\x75\x6e\x6e\x34\x00\x01\x80\x0c\x00\x01\x00\x70\x61\x79\x6c\x6f\x61\x64\x00\x24\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x08\x00\x03\x00\x00\x00\x00\x0c\x08\x00\x04\x00\x00\x00\x00\x04\x44\x00\x01\x80\x0c\x00\x01\x00\x62\x69\x74\x77\x69\x73\x65\x00\x34\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x08\x00\x03\x00\x00\x00\x00\x04\x0c\x00\x04\x80\x08\x00\x01\x00\xff\xc0\x00\x00\x0c\x00\x05\x80\x08\x00\x01\x00\x00\x00\x00\x00\x2c\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x20\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x0c\x00\x03\x80\x08\x00\x01\x00\x64\x40\x00\x00\x2c\x00\x01\x80\x0c\x00\x01\x00\x63\x6f\x75\x6e\x74\x65\x72\x00\x1c\x00\x02\x80\x0c\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0c\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x30\x00\x01\x80\x0e\x00\x01\x00\x69\x6d\x6d\x65\x64\x69\x61\x74\x65\x00\x00\x00\x1c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x00\x10\x00\x02\x80\x0c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x00"),
// batch end
[]byte("\x00\x00\x00\x0a"),
}
testConn := newTestConn(t, want)
table := testConn.AddTable(&nftables.Table{
Family: proto,
Name: "ts-filter-test",
})
chain := testConn.AddChain(&nftables.Chain{
Name: "ts-forward-test",
Table: table,
Type: nftables.ChainTypeFilter,
Hooknum: nftables.ChainHookForward,
Priority: nftables.ChainPriorityFilter,
})
err := addDropOutgoingPacketFromCGNATRangeRuleWithTunname(testConn, table, chain, "testTunn")
if err != nil {
t.Fatal(err)
}
}
func TestAddAcceptOutgoingPacketRule(t *testing.T) {
proto := nftables.TableFamilyIPv4
want := [][]byte{
// batch begin
[]byte("\x00\x00\x00\x0a"),
// nft add table ip ts-filter-test
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x08\x00\x02\x00\x00\x00\x00\x00"),
// nft add chain ip ts-filter-test ts-forward-test { type filter hook forward priority 0\; }
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x14\x00\x03\x00\x74\x73\x2d\x66\x6f\x72\x77\x61\x72\x64\x2d\x74\x65\x73\x74\x00\x14\x00\x04\x80\x08\x00\x01\x00\x00\x00\x00\x02\x08\x00\x02\x00\x00\x00\x00\x00\x0b\x00\x07\x00\x66\x69\x6c\x74\x65\x72\x00\x00"),
// nft add rule ip ts-filter-test ts-forward-test oifname "testTunn" counter accept
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x14\x00\x02\x00\x74\x73\x2d\x66\x6f\x72\x77\x61\x72\x64\x2d\x74\x65\x73\x74\x00\xb4\x00\x04\x80\x24\x00\x01\x80\x09\x00\x01\x00\x6d\x65\x74\x61\x00\x00\x00\x00\x14\x00\x02\x80\x08\x00\x02\x00\x00\x00\x00\x07\x08\x00\x01\x00\x00\x00\x00\x01\x30\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x24\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x10\x00\x03\x80\x0c\x00\x01\x00\x74\x65\x73\x74\x54\x75\x6e\x6e\x2c\x00\x01\x80\x0c\x00\x01\x00\x63\x6f\x75\x6e\x74\x65\x72\x00\x1c\x00\x02\x80\x0c\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0c\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x30\x00\x01\x80\x0e\x00\x01\x00\x69\x6d\x6d\x65\x64\x69\x61\x74\x65\x00\x00\x00\x1c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x00\x10\x00\x02\x80\x0c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01"),
// batch end
[]byte("\x00\x00\x00\x0a"),
}
testConn := newTestConn(t, want)
table := testConn.AddTable(&nftables.Table{
Family: proto,
Name: "ts-filter-test",
})
chain := testConn.AddChain(&nftables.Chain{
Name: "ts-forward-test",
Table: table,
Type: nftables.ChainTypeFilter,
Hooknum: nftables.ChainHookForward,
Priority: nftables.ChainPriorityFilter,
})
err := addAcceptOutgoingPacketRule(testConn, table, chain, "testTunn")
if err != nil {
t.Fatal(err)
}
}
func TestAddMatchSubnetRouteMarkRuleMasq(t *testing.T) {
proto := nftables.TableFamilyIPv4
want := [][]byte{
// batch begin
[]byte("\x00\x00\x00\x0a"),
// nft add table ip ts-nat-test
[]byte("\x02\x00\x00\x00\x10\x00\x01\x00\x74\x73\x2d\x6e\x61\x74\x2d\x74\x65\x73\x74\x00\x08\x00\x02\x00\x00\x00\x00\x00"),
// nft add chain ip ts-nat-test ts-postrouting-test { type nat hook postrouting priority 100; }
[]byte("\x02\x00\x00\x00\x10\x00\x01\x00\x74\x73\x2d\x6e\x61\x74\x2d\x74\x65\x73\x74\x00\x18\x00\x03\x00\x74\x73\x2d\x70\x6f\x73\x74\x72\x6f\x75\x74\x69\x6e\x67\x2d\x74\x65\x73\x74\x00\x14\x00\x04\x80\x08\x00\x01\x00\x00\x00\x00\x04\x08\x00\x02\x00\x00\x00\x00\x64\x08\x00\x07\x00\x6e\x61\x74\x00"),
// nft add rule ip ts-nat-test ts-postrouting-test meta mark & 0x00ff0000 == 0x00040000 counter masquerade
[]byte("\x02\x00\x00\x00\x10\x00\x01\x00\x74\x73\x2d\x6e\x61\x74\x2d\x74\x65\x73\x74\x00\x18\x00\x02\x00\x74\x73\x2d\x70\x6f\x73\x74\x72\x6f\x75\x74\x69\x6e\x67\x2d\x74\x65\x73\x74\x00\xf4\x00\x04\x80\x24\x00\x01\x80\x09\x00\x01\x00\x6d\x65\x74\x61\x00\x00\x00\x00\x14\x00\x02\x80\x08\x00\x02\x00\x00\x00\x00\x03\x08\x00\x01\x00\x00\x00\x00\x01\x44\x00\x01\x80\x0c\x00\x01\x00\x62\x69\x74\x77\x69\x73\x65\x00\x34\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x08\x00\x03\x00\x00\x00\x00\x04\x0c\x00\x04\x80\x08\x00\x01\x00\x00\xff\x00\x00\x0c\x00\x05\x80\x08\x00\x01\x00\x00\x00\x00\x00\x2c\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x20\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x0c\x00\x03\x80\x08\x00\x01\x00\x00\x04\x00\x00\x2c\x00\x01\x80\x0c\x00\x01\x00\x63\x6f\x75\x6e\x74\x65\x72\x00\x1c\x00\x02\x80\x0c\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0c\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x30\x00\x01\x80\x0e\x00\x01\x00\x69\x6d\x6d\x65\x64\x69\x61\x74\x65\x00\x00\x00\x1c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x00\x10\x00\x02\x80\x0c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01"),
// batch end
[]byte("\x00\x00\x00\x0a"),
}
testConn := newTestConn(t, want)
table := testConn.AddTable(&nftables.Table{
Family: proto,
Name: "ts-nat-test",
})
chain := testConn.AddChain(&nftables.Chain{
Name: "ts-postrouting-test",
Table: table,
Type: nftables.ChainTypeNAT,
Hooknum: nftables.ChainHookPostrouting,
Priority: nftables.ChainPriorityNATSource,
})
err := addMatchSubnetRouteMarkRule(testConn, table, chain, Accept)
if err != nil {
t.Fatal(err)
}
}
func TestAddMatchSubnetRouteMarkRuleAccept(t *testing.T) {
proto := nftables.TableFamilyIPv4
want := [][]byte{
// batch begin
[]byte("\x00\x00\x00\x0a"),
// nft add table ip ts-filter-test
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x08\x00\x02\x00\x00\x00\x00\x00"),
// nft add chain ip ts-filter-test ts-forward-test { type filter hook forward priority 0\; }
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x14\x00\x03\x00\x74\x73\x2d\x66\x6f\x72\x77\x61\x72\x64\x2d\x74\x65\x73\x74\x00\x14\x00\x04\x80\x08\x00\x01\x00\x00\x00\x00\x02\x08\x00\x02\x00\x00\x00\x00\x00\x0b\x00\x07\x00\x66\x69\x6c\x74\x65\x72\x00\x00"),
// nft add rule ip ts-filter-test ts-forward-test meta mark and 0x00ff0000 eq 0x00040000 counter accept
[]byte("\x02\x00\x00\x00\x13\x00\x01\x00\x74\x73\x2d\x66\x69\x6c\x74\x65\x72\x2d\x74\x65\x73\x74\x00\x00\x14\x00\x02\x00\x74\x73\x2d\x66\x6f\x72\x77\x61\x72\x64\x2d\x74\x65\x73\x74\x00\xf4\x00\x04\x80\x24\x00\x01\x80\x09\x00\x01\x00\x6d\x65\x74\x61\x00\x00\x00\x00\x14\x00\x02\x80\x08\x00\x02\x00\x00\x00\x00\x03\x08\x00\x01\x00\x00\x00\x00\x01\x44\x00\x01\x80\x0c\x00\x01\x00\x62\x69\x74\x77\x69\x73\x65\x00\x34\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x08\x00\x03\x00\x00\x00\x00\x04\x0c\x00\x04\x80\x08\x00\x01\x00\x00\xff\x00\x00\x0c\x00\x05\x80\x08\x00\x01\x00\x00\x00\x00\x00\x2c\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x20\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x0c\x00\x03\x80\x08\x00\x01\x00\x00\x04\x00\x00\x2c\x00\x01\x80\x0c\x00\x01\x00\x63\x6f\x75\x6e\x74\x65\x72\x00\x1c\x00\x02\x80\x0c\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0c\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x30\x00\x01\x80\x0e\x00\x01\x00\x69\x6d\x6d\x65\x64\x69\x61\x74\x65\x00\x00\x00\x1c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x00\x10\x00\x02\x80\x0c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01"),
// batch end
[]byte("\x00\x00\x00\x0a"),
}
testConn := newTestConn(t, want)
table := testConn.AddTable(&nftables.Table{
Family: proto,
Name: "ts-filter-test",
})
chain := testConn.AddChain(&nftables.Chain{
Name: "ts-forward-test",
Table: table,
Type: nftables.ChainTypeFilter,
Hooknum: nftables.ChainHookForward,
Priority: nftables.ChainPriorityFilter,
})
err := addMatchSubnetRouteMarkRule(testConn, table, chain, Accept)
if err != nil {
t.Fatal(err)
}
}
func newSysConn(t *testing.T) *nftables.Conn {
t.Helper()
runtime.LockOSThread()
ns, err := netns.New()
if err != nil {
t.Fatalf("netns.New() failed: %v", err)
}
c, err := nftables.New(nftables.WithNetNSFd(int(ns)))
if err != nil {
t.Fatalf("nftables.New() failed: %v", err)
}
t.Cleanup(func() { cleanupSysConn(t, ns) })
return c
}
func cleanupSysConn(t *testing.T, ns netns.NsHandle) {
defer runtime.UnlockOSThread()
if err := ns.Close(); err != nil {
t.Fatalf("newNS.Close() failed: %v", err)
}
}
func newFakeNftablesRunner(t *testing.T, conn *nftables.Conn) *nftablesRunner {
nft4 := &nftable{Proto: nftables.TableFamilyIPv4}
nft6 := &nftable{Proto: nftables.TableFamilyIPv6}
return &nftablesRunner{
conn: conn,
nft4: nft4,
nft6: nft6,
v6Available: true,
v6NATAvailable: true,
}
}
func TestAddAndDelNetfilterChains(t *testing.T) {
if os.Geteuid() != 0 {
t.Skip(t.Name(), " requires privileges to create a namespace in order to run")
return
}
conn := newSysConn(t)
runner := newFakeNftablesRunner(t, conn)
runner.AddChains()
tables, err := conn.ListTables()
if err != nil {
t.Fatalf("conn.ListTables() failed: %v", err)
}
if len(tables) != 4 {
t.Fatalf("len(tables) = %d, want 4", len(tables))
}
chainsV4, err := conn.ListChainsOfTableFamily(nftables.TableFamilyIPv4)
if err != nil {
t.Fatalf("list chains failed: %v", err)
}
if len(chainsV4) != 3 {
t.Fatalf("len(chainsV4) = %d, want 3", len(chainsV4))
}
chainsV6, err := conn.ListChainsOfTableFamily(nftables.TableFamilyIPv6)
if err != nil {
t.Fatalf("list chains failed: %v", err)
}
if len(chainsV6) != 3 {
t.Fatalf("len(chainsV6) = %d, want 3", len(chainsV6))
}
runner.DelChains()
tables, err = conn.ListTables()
if err != nil {
t.Fatalf("conn.ListTables() failed: %v", err)
}
if len(tables) != 0 {
t.Fatalf("len(tables) = %d, want 0", len(tables))
}
}
func getTsChains(
conn *nftables.Conn,
proto nftables.TableFamily) (*nftables.Chain, *nftables.Chain, *nftables.Chain, error) {
chains, err := conn.ListChainsOfTableFamily(nftables.TableFamilyIPv4)
if err != nil {
return nil, nil, nil, fmt.Errorf("list chains failed: %w", err)
}
var chainInput, chainForward, chainPostrouting *nftables.Chain
for _, chain := range chains {
switch chain.Name {
case "ts-input":
chainInput = chain
case "ts-forward":
chainForward = chain
case "ts-postrouting":
chainPostrouting = chain
}
}
return chainInput, chainForward, chainPostrouting, nil
}
// findV4BaseRules verifies that the base rules are present in the input and forward chains.
func findV4BaseRules(
conn *nftables.Conn,
inpChain *nftables.Chain,
forwChain *nftables.Chain,
tunname string) ([]*nftables.Rule, error) {
want := []*nftables.Rule{}
rule, err := createRangeRule(inpChain.Table, inpChain, tunname, tsaddr.ChromeOSVMRange(), expr.VerdictReturn)
if err != nil {
return nil, fmt.Errorf("create rule: %w", err)
}
want = append(want, rule)
rule, err = createRangeRule(inpChain.Table, inpChain, tunname, tsaddr.CGNATRange(), expr.VerdictDrop)
if err != nil {
return nil, fmt.Errorf("create rule: %w", err)
}
want = append(want, rule)
rule, err = createDropOutgoingPacketFromCGNATRangeRuleWithTunname(forwChain.Table, forwChain, tunname)
if err != nil {
return nil, fmt.Errorf("create rule: %w", err)
}
want = append(want, rule)
get := []*nftables.Rule{}
for _, rule := range want {
getRule, err := findRule(conn, rule)
if err != nil {
return nil, fmt.Errorf("find rule: %w", err)
}
get = append(get, getRule)
}
return get, nil
}
func findCommonBaseRules(
conn *nftables.Conn,
forwChain *nftables.Chain,
tunname string) ([]*nftables.Rule, error) {
want := []*nftables.Rule{}
rule, err := createSetSubnetRouteMarkRule(forwChain.Table, forwChain, tunname)
if err != nil {
return nil, fmt.Errorf("create rule: %w", err)
}
want = append(want, rule)
rule, err = createMatchSubnetRouteMarkRule(forwChain.Table, forwChain, Accept)
if err != nil {
return nil, fmt.Errorf("create rule: %w", err)
}
want = append(want, rule)
rule = createAcceptOutgoingPacketRule(forwChain.Table, forwChain, tunname)
want = append(want, rule)
get := []*nftables.Rule{}
for _, rule := range want {
getRule, err := findRule(conn, rule)
if err != nil {
return nil, fmt.Errorf("find rule: %w", err)
}
get = append(get, getRule)
}
return get, nil
}
func TestNFTAddAndDelNetfilterBase(t *testing.T) {
if os.Geteuid() != 0 {
t.Skip(t.Name(), " requires privileges to create a namespace in order to run")
return
}
conn := newSysConn(t)
runner := newFakeNftablesRunner(t, conn)
runner.AddChains()
defer runner.DelChains()
runner.AddBase("testTunn")
// check number of rules in each IPv4 TS chain
inputV4, forwardV4, postroutingV4, err := getTsChains(conn, nftables.TableFamilyIPv4)
if err != nil {
t.Fatalf("getTsChains() failed: %v", err)
}
inputV4Rules, err := conn.GetRules(runner.nft4.Filter, inputV4)
if err != nil {
t.Fatalf("conn.GetRules() failed: %v", err)
}
if len(inputV4Rules) != 2 {
t.Fatalf("len(inputV4Rules) = %d, want 2", len(inputV4Rules))
}
forwardV4Rules, err := conn.GetRules(runner.nft4.Filter, forwardV4)
if err != nil {
t.Fatalf("conn.GetRules() failed: %v", err)
}
if len(forwardV4Rules) != 4 {
t.Fatalf("len(forwardV4Rules) = %d, want 4", len(forwardV4Rules))
}
postroutingV4Rules, err := conn.GetRules(runner.nft4.Nat, postroutingV4)
if err != nil {
t.Fatalf("conn.GetRules() failed: %v", err)
}
if len(postroutingV4Rules) != 0 {
t.Fatalf("len(postroutingV4Rules) = %d, want 0", len(postroutingV4Rules))
}
_, err = findV4BaseRules(conn, inputV4, forwardV4, "testTunn")
if err != nil {
t.Fatalf("missing v4 base rule: %v", err)
}
_, err = findCommonBaseRules(conn, forwardV4, "testTunn")
if err != nil {
t.Fatalf("missing v4 base rule: %v", err)
}
// Check number of rules in each IPv6 TS chain.
inputV6, forwardV6, postroutingV6, err := getTsChains(conn, nftables.TableFamilyIPv6)
if err != nil {
t.Fatalf("getTsChains() failed: %v", err)
}
inputV6Rules, err := conn.GetRules(runner.nft6.Filter, inputV6)
if err != nil {
t.Fatalf("conn.GetRules() failed: %v", err)
}
if len(inputV6Rules) != 0 {
t.Fatalf("len(inputV6Rules) = %d, want 0", len(inputV4Rules))
}
forwardV6Rules, err := conn.GetRules(runner.nft6.Filter, forwardV6)
if err != nil {
t.Fatalf("conn.GetRules() failed: %v", err)
}
if len(forwardV6Rules) != 3 {
t.Fatalf("len(forwardV6Rules) = %d, want 3", len(forwardV4Rules))
}
postroutingV6Rules, err := conn.GetRules(runner.nft6.Nat, postroutingV6)
if err != nil {
t.Fatalf("conn.GetRules() failed: %v", err)
}
if len(postroutingV6Rules) != 0 {
t.Fatalf("len(postroutingV6Rules) = %d, want 0", len(postroutingV4Rules))
}
_, err = findCommonBaseRules(conn, forwardV6, "testTunn")
if err != nil {
t.Fatalf("missing v6 base rule: %v", err)
}
runner.DelBase()
chains, err := conn.ListChains()
if err != nil {
t.Fatalf("conn.ListChains() failed: %v", err)
}
for _, chain := range chains {
chainRules, err := conn.GetRules(chain.Table, chain)
if err != nil {
t.Fatalf("conn.GetRules() failed: %v", err)
}
if len(chainRules) != 0 {
t.Fatalf("len(chainRules) = %d, want 0", len(chainRules))
}
}
}
func findLoopBackRule(conn *nftables.Conn, proto nftables.TableFamily, table *nftables.Table, chain *nftables.Chain, addr netip.Addr) (*nftables.Rule, error) {
matchingAddr := addr.AsSlice()
saddrExpr, err := newLoadSaddrExpr(proto, 1)
if err != nil {
return nil, fmt.Errorf("get expr: %w", err)
}
loopBackRule := &nftables.Rule{
Table: table,
Chain: chain,
Exprs: []expr.Any{
&expr.Meta{
Key: expr.MetaKeyIIFNAME,
Register: 1,
},
&expr.Cmp{
Op: expr.CmpOpEq,
Register: 1,
Data: []byte("lo"),
},
saddrExpr,
&expr.Cmp{
Op: expr.CmpOpEq,
Register: 1,
Data: matchingAddr,
},
&expr.Counter{},
&expr.Verdict{
Kind: expr.VerdictAccept,
},
},
}
existingLoopBackRule, err := findRule(conn, loopBackRule)
if err != nil {
return nil, fmt.Errorf("find loop back rule: %w", err)
}
return existingLoopBackRule, nil
}
func TestNFTAddAndDelLoopbackRule(t *testing.T) {
if os.Geteuid() != 0 {
t.Skip(t.Name(), " requires privileges to create a namespace in order to run")
return
}
conn := newSysConn(t)
runner := newFakeNftablesRunner(t, conn)
runner.AddChains()
defer runner.DelChains()
runner.AddBase("testTunn")
defer runner.DelBase()
addr := netip.MustParseAddr("192.168.0.2")
addrV6 := netip.MustParseAddr("2001:db8::2")
runner.AddLoopbackRule(addr)
runner.AddLoopbackRule(addrV6)
inputV4, _, _, err := getTsChains(conn, nftables.TableFamilyIPv4)
if err != nil {
t.Fatalf("getTsChains() failed: %v", err)
}
inputV4Rules, err := conn.GetRules(runner.nft4.Filter, inputV4)
if err != nil {
t.Fatalf("conn.GetRules() failed: %v", err)
}
if len(inputV4Rules) != 3 {
t.Fatalf("len(inputV4Rules) = %d, want 3", len(inputV4Rules))
}
existingLoopBackRule, err := findLoopBackRule(conn, nftables.TableFamilyIPv4, runner.nft4.Filter, inputV4, addr)
if err != nil {
t.Fatalf("findLoopBackRule() failed: %v", err)
}
if existingLoopBackRule.Position != 0 {
t.Fatalf("existingLoopBackRule.Handle = %d, want 0", existingLoopBackRule.Handle)
}
inputV6, _, _, err := getTsChains(conn, nftables.TableFamilyIPv6)
if err != nil {
t.Fatalf("getTsChains() failed: %v", err)
}
inputV6Rules, err := conn.GetRules(runner.nft6.Filter, inputV4)
if err != nil {
t.Fatalf("conn.GetRules() failed: %v", err)
}
if len(inputV6Rules) != 1 {
t.Fatalf("len(inputV4Rules) = %d, want 1", len(inputV4Rules))
}
existingLoopBackRuleV6, err := findLoopBackRule(conn, nftables.TableFamilyIPv6, runner.nft6.Filter, inputV6, addrV6)
if err != nil {
t.Fatalf("findLoopBackRule() failed: %v", err)
}
if existingLoopBackRuleV6.Position != 0 {
t.Fatalf("existingLoopBackRule.Handle = %d, want 0", existingLoopBackRule.Handle)
}
runner.DelLoopbackRule(addr)
runner.DelLoopbackRule(addrV6)
inputV4Rules, err = conn.GetRules(runner.nft4.Filter, inputV4)
if err != nil {
t.Fatalf("conn.GetRules() failed: %v", err)
}
if len(inputV4Rules) != 2 {
t.Fatalf("len(inputV4Rules) = %d, want 2", len(inputV4Rules))
}
}

29
wgengine/router/router_linux.go
Unescape Escape View File

@ -36,9 +36,8 @@ const (
netfilterOn = preftype.NetfilterOn
)
// netfilterRunner abstracts helpers to run netfilter commands. It
// exists purely to swap out go-iptables for a fake implementation in
// tests.
// netfilterRunner abstracts helpers to run netfilter commands. It is
// implemented by linuxfw.IPTablesRunner and linuxfw.NfTablesRunner.
type netfilterRunner interface {
AddLoopbackRule(addr netip.Addr) error
DelLoopbackRule(addr netip.Addr) error
@ -55,14 +54,24 @@ type netfilterRunner interface {
HasIPV6NAT() bool
}
// newNetfilterRunner creates a netfilterRunner using either nftables or iptables.
// As nftables is still experimental, iptables will be used unless TS_DEBUG_USE_NETLINK_NFTABLES is set.
func newNetfilterRunner(logf logger.Logf) (netfilterRunner, error) {
var nfr netfilterRunner
var err error
nfr, err = linuxfw.NewIPTablesRunner(logf)
if err != nil {
return nil, err
if envknob.Bool("TS_DEBUG_USE_NETLINK_NFTABLES") {
logf("router: using nftables")
nfr, err = linuxfw.NewNfTablesRunner(logf)
if err != nil {
return nil, err
}
} else {
logf("router: using iptables")
nfr, err = linuxfw.NewIPTablesRunner(logf)
if err != nil {
return nil, err
}
}
return nfr, nil
}
@ -489,9 +498,11 @@ func (r *linuxRouter) setNetfilterMode(mode preftype.NetfilterMode) error {
if err := r.nfr.DelBase(); err != nil {
return err
}
// AddHooks adds the ts loopback rule.
if err := r.nfr.AddHooks(); err != nil {
return err
}
// AddBase adds base ts rules
if err := r.nfr.AddBase(r.tunname); err != nil {
return err
}
@ -1278,9 +1289,13 @@ func normalizeCIDR(cidr netip.Prefix) string {
return cidr.Masked().String()
}
// cleanup removes all the rules and routes that were added by the linux router.
// The function calls cleanup for both iptables and nftables since which ever
// netfilter runner is used, the cleanup function for the other one doesn't do anything.
func cleanup(logf logger.Logf, interfaceName string) {
if interfaceName != "userspace-networking" {
linuxfw.IPTablesCleanup(logf)
linuxfw.NfTablesCleanUp(logf)
}
}

8
wgengine/router/router_linux_test.go
Unescape Escape View File

@ -453,18 +453,18 @@ func (n *fakeIPTablesRunner) AddLoopbackRule(addr netip.Addr) error {
}
func (n *fakeIPTablesRunner) AddBase(tunname string) error {
if err := n.AddBase4(tunname); err != nil {
if err := n.addBase4(tunname); err != nil {
return err
}
if n.HasIPV6() {
if err := n.AddBase6(tunname); err != nil {
if err := n.addBase6(tunname); err != nil {
return err
}
}
return nil
}
func (n *fakeIPTablesRunner) AddBase4(tunname string) error {
func (n *fakeIPTablesRunner) addBase4(tunname string) error {
curIPT := n.ipt4
newRules := []struct{ chain, rule string }{
{"filter/ts-input", fmt.Sprintf("! -i %s -s %s -j RETURN", tunname, tsaddr.ChromeOSVMRange().String())},
@ -482,7 +482,7 @@ func (n *fakeIPTablesRunner) AddBase4(tunname string) error {
return nil
}
func (n *fakeIPTablesRunner) AddBase6(tunname string) error {
func (n *fakeIPTablesRunner) addBase6(tunname string) error {
curIPT := n.ipt6
newRules := []struct{ chain, rule string }{
{"filter/ts-forward", fmt.Sprintf("-i %s -j MARK --set-mark %s/%s", tunname, linuxfw.TailscaleSubnetRouteMark, linuxfw.TailscaleFwmarkMask)},

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