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wgengine/router: set up basic IPv6 routing/firewalling.

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Part of #19.

Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson
2020-09-22 00:49:44 +00:00
committed by Dave Anderson
parent f0ef561049
commit 0d80904fc2
3 changed files with 463 additions and 331 deletions
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427
wgengine/router/router_linux_test.go
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@@ -34,10 +34,14 @@ func mustCIDRs(ss ...string) []netaddr.IPPrefix {
func TestRouterStates(t *testing.T) {
basic := `
ip rule add pref 5210 fwmark 0x80000 table main
ip rule add pref 5230 fwmark 0x80000 table default
ip rule add pref 5250 fwmark 0x80000 type unreachable
ip rule add pref 5270 table 52
ip rule add -4 pref 5210 fwmark 0x80000 table main
ip rule add -4 pref 5230 fwmark 0x80000 table default
ip rule add -4 pref 5250 fwmark 0x80000 type unreachable
ip rule add -4 pref 5270 table 52
ip rule add -6 pref 5210 fwmark 0x80000 table main
ip rule add -6 pref 5230 fwmark 0x80000 table default
ip rule add -6 pref 5250 fwmark 0x80000 type unreachable
ip rule add -6 pref 5270 table 52
`
states := []struct {
name string
@@ -104,17 +108,24 @@ up
ip addr add 100.101.102.104/10 dev tailscale0
ip route add 10.0.0.0/8 dev tailscale0 table 52
ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
`filter/FORWARD -j ts-forward
filter/INPUT -j ts-input
filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
filter/ts-forward -o tailscale0 -j ACCEPT
filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
nat/POSTROUTING -j ts-postrouting
nat/ts-postrouting -m mark --mark 0x40000 -j MASQUERADE
`v4/filter/FORWARD -j ts-forward
v4/filter/INPUT -j ts-input
v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
v4/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
v4/filter/ts-forward -o tailscale0 -j ACCEPT
v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
v4/nat/POSTROUTING -j ts-postrouting
v4/nat/ts-postrouting -m mark --mark 0x40000 -j MASQUERADE
v6/filter/FORWARD -j ts-forward
v6/filter/INPUT -j ts-input
v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
v6/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
v6/filter/ts-forward -o tailscale0 -j ACCEPT
v6/nat/POSTROUTING -j ts-postrouting
v6/nat/ts-postrouting -m mark --mark 0x40000 -j MASQUERADE
`,
},
{
@@ -129,16 +140,22 @@ up
ip addr add 100.101.102.104/10 dev tailscale0
ip route add 10.0.0.0/8 dev tailscale0 table 52
ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
`filter/FORWARD -j ts-forward
filter/INPUT -j ts-input
filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
filter/ts-forward -o tailscale0 -j ACCEPT
filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
nat/POSTROUTING -j ts-postrouting
`v4/filter/FORWARD -j ts-forward
v4/filter/INPUT -j ts-input
v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
v4/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
v4/filter/ts-forward -o tailscale0 -j ACCEPT
v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
v4/nat/POSTROUTING -j ts-postrouting
v6/filter/FORWARD -j ts-forward
v6/filter/INPUT -j ts-input
v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
v6/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
v6/filter/ts-forward -o tailscale0 -j ACCEPT
v6/nat/POSTROUTING -j ts-postrouting
`,
},
@@ -156,16 +173,22 @@ up
ip addr add 100.101.102.104/10 dev tailscale0
ip route add 10.0.0.0/8 dev tailscale0 table 52
ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
`filter/FORWARD -j ts-forward
filter/INPUT -j ts-input
filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
filter/ts-forward -o tailscale0 -j ACCEPT
filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
nat/POSTROUTING -j ts-postrouting
`v4/filter/FORWARD -j ts-forward
v4/filter/INPUT -j ts-input
v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
v4/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
v4/filter/ts-forward -o tailscale0 -j ACCEPT
v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
v4/nat/POSTROUTING -j ts-postrouting
v6/filter/FORWARD -j ts-forward
v6/filter/INPUT -j ts-input
v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
v6/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
v6/filter/ts-forward -o tailscale0 -j ACCEPT
v6/nat/POSTROUTING -j ts-postrouting
`,
},
{
@@ -180,16 +203,22 @@ up
ip addr add 100.101.102.104/10 dev tailscale0
ip route add 10.0.0.0/8 dev tailscale0 table 52
ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
`filter/FORWARD -j ts-forward
filter/INPUT -j ts-input
filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
filter/ts-forward -o tailscale0 -j ACCEPT
filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
nat/POSTROUTING -j ts-postrouting
`v4/filter/FORWARD -j ts-forward
v4/filter/INPUT -j ts-input
v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
v4/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
v4/filter/ts-forward -o tailscale0 -j ACCEPT
v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
v4/nat/POSTROUTING -j ts-postrouting
v6/filter/FORWARD -j ts-forward
v6/filter/INPUT -j ts-input
v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
v6/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
v6/filter/ts-forward -o tailscale0 -j ACCEPT
v6/nat/POSTROUTING -j ts-postrouting
`,
},
@@ -205,13 +234,16 @@ up
ip addr add 100.101.102.104/10 dev tailscale0
ip route add 10.0.0.0/8 dev tailscale0 table 52
ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
`filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
filter/ts-forward -o tailscale0 -j ACCEPT
filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
`v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
v4/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
v4/filter/ts-forward -o tailscale0 -j ACCEPT
v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
v6/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
v6/filter/ts-forward -o tailscale0 -j ACCEPT
`,
},
{
@@ -226,22 +258,28 @@ up
ip addr add 100.101.102.104/10 dev tailscale0
ip route add 10.0.0.0/8 dev tailscale0 table 52
ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
`filter/FORWARD -j ts-forward
filter/INPUT -j ts-input
filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
filter/ts-forward -o tailscale0 -j ACCEPT
filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
nat/POSTROUTING -j ts-postrouting
`v4/filter/FORWARD -j ts-forward
v4/filter/INPUT -j ts-input
v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
v4/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
v4/filter/ts-forward -o tailscale0 -j ACCEPT
v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
v4/nat/POSTROUTING -j ts-postrouting
v6/filter/FORWARD -j ts-forward
v6/filter/INPUT -j ts-input
v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
v6/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
v6/filter/ts-forward -o tailscale0 -j ACCEPT
v6/nat/POSTROUTING -j ts-postrouting
`,
},
}
fake := NewFakeOS(t)
router, err := newUserspaceRouterAdvanced(t.Logf, "tailscale0", fake, fake)
router, err := newUserspaceRouterAdvanced(t.Logf, "tailscale0", fake.netfilter4, fake.netfilter6, fake)
if err != nil {
t.Fatalf("failed to create router: %v", err)
}
@@ -275,21 +313,15 @@ nat/POSTROUTING -j ts-postrouting
}
}
// fakeOS implements netfilterRunner and commandRunner, but captures
// changes without touching the OS.
type fakeOS struct {
t *testing.T
up bool
ips []string
routes []string
rules []string
netfilter map[string][]string
type fakeNetfilter struct {
t *testing.T
n map[string][]string
}
func NewFakeOS(t *testing.T) *fakeOS {
return &fakeOS{
func newNetfilter(t *testing.T) *fakeNetfilter {
return &fakeNetfilter{
t: t,
netfilter: map[string][]string{
n: map[string][]string{
"filter/INPUT": nil,
"filter/OUTPUT": nil,
"filter/FORWARD": nil,
@@ -300,6 +332,118 @@ func NewFakeOS(t *testing.T) *fakeOS {
}
}
func (n *fakeNetfilter) Insert(table, chain string, pos int, args ...string) error {
k := table + "/" + chain
if rules, ok := n.n[k]; ok {
if pos > len(rules)+1 {
n.t.Errorf("bad position %d in %s", pos, k)
return errExec
}
rules = append(rules, "")
copy(rules[pos:], rules[pos-1:])
rules[pos-1] = strings.Join(args, " ")
n.n[k] = rules
} else {
n.t.Errorf("unknown table/chain %s", k)
return errExec
}
return nil
}
func (n *fakeNetfilter) Append(table, chain string, args ...string) error {
k := table + "/" + chain
return n.Insert(table, chain, len(n.n[k])+1, args...)
}
func (n *fakeNetfilter) Exists(table, chain string, args ...string) (bool, error) {
k := table + "/" + chain
if rules, ok := n.n[k]; ok {
for _, rule := range rules {
if rule == strings.Join(args, " ") {
return true, nil
}
}
return false, nil
} else {
n.t.Errorf("unknown table/chain %s", k)
return false, errExec
}
}
func (n *fakeNetfilter) Delete(table, chain string, args ...string) error {
k := table + "/" + chain
if rules, ok := n.n[k]; ok {
for i, rule := range rules {
if rule == strings.Join(args, " ") {
rules = append(rules[:i], rules[i+1:]...)
n.n[k] = rules
return nil
}
}
n.t.Errorf("delete of unknown rule %q from %s", strings.Join(args, " "), k)
return errExec
} else {
n.t.Errorf("unknown table/chain %s", k)
return errExec
}
}
func (n *fakeNetfilter) ClearChain(table, chain string) error {
k := table + "/" + chain
if _, ok := n.n[k]; ok {
n.n[k] = nil
return nil
} else {
n.t.Logf("note: ClearChain: unknown table/chain %s", k)
return errors.New("exitcode:1")
}
}
func (n *fakeNetfilter) NewChain(table, chain string) error {
k := table + "/" + chain
if _, ok := n.n[k]; ok {
n.t.Errorf("table/chain %s already exists", k)
return errExec
}
n.n[k] = nil
return nil
}
func (n *fakeNetfilter) DeleteChain(table, chain string) error {
k := table + "/" + chain
if rules, ok := n.n[k]; ok {
if len(rules) != 0 {
n.t.Errorf("%s is not empty", k)
return errExec
}
delete(n.n, k)
return nil
} else {
n.t.Errorf("%s does not exist", k)
return errExec
}
}
// fakeOS implements commandRunner and provides v4 and v6
// netfilterRunners, but captures changes without touching the OS.
type fakeOS struct {
t *testing.T
up bool
ips []string
routes []string
rules []string
netfilter4 *fakeNetfilter
netfilter6 *fakeNetfilter
}
func NewFakeOS(t *testing.T) *fakeOS {
return &fakeOS{
t: t,
netfilter4: newNetfilter(t),
netfilter6: newNetfilter(t),
}
}
var errExec = errors.New("execution failed")
func (o *fakeOS) String() string {
@@ -323,120 +467,30 @@ func (o *fakeOS) String() string {
}
var chains []string
for chain := range o.netfilter {
for chain := range o.netfilter4.n {
chains = append(chains, chain)
}
sort.Strings(chains)
for _, chain := range chains {
for _, rule := range o.netfilter[chain] {
fmt.Fprintf(&b, "%s %s\n", chain, rule)
for _, rule := range o.netfilter4.n[chain] {
fmt.Fprintf(&b, "v4/%s %s\n", chain, rule)
}
}
chains = nil
for chain := range o.netfilter6.n {
chains = append(chains, chain)
}
sort.Strings(chains)
for _, chain := range chains {
for _, rule := range o.netfilter6.n[chain] {
fmt.Fprintf(&b, "v6/%s %s\n", chain, rule)
}
}
return b.String()[:len(b.String())-1]
}
func (o *fakeOS) Insert(table, chain string, pos int, args ...string) error {
k := table + "/" + chain
if rules, ok := o.netfilter[k]; ok {
if pos > len(rules)+1 {
o.t.Errorf("bad position %d in %s", pos, k)
return errExec
}
rules = append(rules, "")
copy(rules[pos:], rules[pos-1:])
rules[pos-1] = strings.Join(args, " ")
o.netfilter[k] = rules
} else {
o.t.Errorf("unknown table/chain %s", k)
return errExec
}
return nil
}
func (o *fakeOS) Append(table, chain string, args ...string) error {
k := table + "/" + chain
return o.Insert(table, chain, len(o.netfilter[k])+1, args...)
}
func (o *fakeOS) Exists(table, chain string, args ...string) (bool, error) {
k := table + "/" + chain
if rules, ok := o.netfilter[k]; ok {
for _, rule := range rules {
if rule == strings.Join(args, " ") {
return true, nil
}
}
return false, nil
} else {
o.t.Errorf("unknown table/chain %s", k)
return false, errExec
}
}
func (o *fakeOS) Delete(table, chain string, args ...string) error {
k := table + "/" + chain
if rules, ok := o.netfilter[k]; ok {
for i, rule := range rules {
if rule == strings.Join(args, " ") {
rules = append(rules[:i], rules[i+1:]...)
o.netfilter[k] = rules
return nil
}
}
o.t.Errorf("delete of unknown rule %q from %s", strings.Join(args, " "), k)
return errExec
} else {
o.t.Errorf("unknown table/chain %s", k)
return errExec
}
}
func (o *fakeOS) ListChains(table string) (ret []string, err error) {
for chain := range o.netfilter {
pfx := table + "/"
if strings.HasPrefix(chain, pfx) {
ret = append(ret, chain[len(pfx):])
}
}
return ret, nil
}
func (o *fakeOS) ClearChain(table, chain string) error {
k := table + "/" + chain
if _, ok := o.netfilter[k]; ok {
o.netfilter[k] = nil
return nil
} else {
o.t.Logf("note: ClearChain: unknown table/chain %s", k)
return errors.New("exitcode:1")
}
}
func (o *fakeOS) NewChain(table, chain string) error {
k := table + "/" + chain
if _, ok := o.netfilter[k]; ok {
o.t.Errorf("table/chain %s already exists", k)
return errExec
}
o.netfilter[k] = nil
return nil
}
func (o *fakeOS) DeleteChain(table, chain string) error {
k := table + "/" + chain
if rules, ok := o.netfilter[k]; ok {
if len(rules) != 0 {
o.t.Errorf("%s is not empty", k)
return errExec
}
delete(o.netfilter, k)
return nil
} else {
o.t.Errorf("%s does not exist", k)
return errExec
}
}
func (o *fakeOS) run(args ...string) error {
unexpected := func() error {
o.t.Errorf("unexpected invocation %q", strings.Join(args, " "))
@@ -446,7 +500,20 @@ func (o *fakeOS) run(args ...string) error {
return unexpected()
}
if len(args) == 2 && args[1] == "rule" {
// naked invocation of `ip rule` is a feature test. Return
// successfully.
return nil
}
family := ""
rest := strings.Join(args[3:], " ")
if args[1] == "-4" || args[1] == "-6" {
family = args[1]
copy(args[1:], args[2:])
args = args[:len(args)-1]
rest = family + " " + strings.Join(args[3:], " ")
}
var l *[]string
switch args[1] {