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util/linuxfw,wgengine/router: enable IPv6 configuration when netfilter is disabled 

Updates #11434

Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker 2024-03-21 15:43:12 -07:00 committed by James Tucker
parent 8444937c89
commit 3f7313dbdb
4 changed files with 12 additions and 6 deletions
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2
util/linuxfw/iptables_runner.go
View File

@ -59,7 +59,7 @@ func newIPTablesRunner(logf logger.Logf) (*iptablesRunner, error) {
}
supportsV6, supportsV6NAT := false, false
v6err := checkIPv6(logf)
v6err := CheckIPv6(logf)
ip6terr := checkIP6TablesExists()
var ipt6 *iptables.IPTables
switch {

2
util/linuxfw/linuxfw.go
View File

@ -130,7 +130,7 @@ func errCode(err error) int {
// missing. It does not check that IPv6 is currently functional or
// that there's a global address, just that the system would support
// IPv6 if it were on an IPv6 network.
func checkIPv6(logf logger.Logf) error {
func CheckIPv6(logf logger.Logf) error {
_, err := os.Stat("/proc/sys/net/ipv6")
if os.IsNotExist(err) {
return err

2
util/linuxfw/nftables_runner.go
View File

@ -546,7 +546,7 @@ func newNfTablesRunner(logf logger.Logf) (*nftablesRunner, error) {
}
nft4 := &nftable{Proto: nftables.TableFamilyIPv4}
v6err := checkIPv6(logf)
v6err := CheckIPv6(logf)
if v6err != nil {
logf("disabling tunneled IPv6 due to system IPv6 config: %v", v6err)
}

12
wgengine/router/router_linux.go
View File

@ -56,6 +56,7 @@ type linuxRouter struct {
// Various feature checks for the network stack.
ipRuleAvailable bool // whether kernel was built with IP_MULTIPLE_TABLES
v6Available bool // whether the kernel supports IPv6
fwmaskWorks bool // whether we can use 'ip rule...fwmark <mark>/<mask>'
// ipPolicyPrefBase is the base priority at which ip rules are installed.
@ -142,6 +143,8 @@ func newUserspaceRouterAdvanced(logf logger.Logf, tunname string, netMon *netmon
r.logf("mwan3 on openWRT detected, switching policy base priority to 1300")
}
r.v6Available = linuxfw.CheckIPv6(r.logf) == nil
r.fixupWSLMTU()
return r, nil
@ -416,7 +419,7 @@ func (r *linuxRouter) UpdateMagicsockPort(port uint16, network string) error {
case "udp4":
magicsockPort = &r.magicsockPortV4
case "udp6":
if !r.nfr.HasIPV6() {
if !r.getV6Available() {
return nil
}
magicsockPort = &r.magicsockPortV6
@ -523,7 +526,7 @@ func (r *linuxRouter) setNetfilterMode(mode preftype.NetfilterMode) error {
return fmt.Errorf("could not add magicsock port rule v4: %w", err)
}
}
if r.magicsockPortV6 != 0 && r.nfr.HasIPV6() {
if r.magicsockPortV6 != 0 && r.getV6Available() {
if err := r.nfr.AddMagicsockPortRule(r.magicsockPortV6, "udp6"); err != nil {
return fmt.Errorf("could not add magicsock port rule v6: %w", err)
}
@ -563,7 +566,7 @@ func (r *linuxRouter) setNetfilterMode(mode preftype.NetfilterMode) error {
return fmt.Errorf("could not add magicsock port rule v4: %w", err)
}
}
if r.magicsockPortV6 != 0 && r.nfr.HasIPV6() {
if r.magicsockPortV6 != 0 && r.getV6Available() {
if err := r.nfr.AddMagicsockPortRule(r.magicsockPortV6, "udp6"); err != nil {
return fmt.Errorf("could not add magicsock port rule v6: %w", err)
}
@ -602,6 +605,9 @@ func (r *linuxRouter) setNetfilterMode(mode preftype.NetfilterMode) error {
}
func (r *linuxRouter) getV6Available() bool {
if r.netfilterMode == netfilterOff {
return r.v6Available
}
return r.nfr.HasIPV6()
}