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wgengine/router: don't configure IPv6 on Linux when IPv6 is unavailable

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Fixes #1214

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
(cherry picked from commit c7fc4a06da)
This commit is contained in:
Brad Fitzpatrick 2021-01-28 08:06:56 -08:00 committed by David Anderson
parent 775fe13e27
commit fc30cff688
1 changed files with 12 additions and 1 deletions
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13
wgengine/router/router_linux.go
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@ -366,7 +366,9 @@ func (r *linuxRouter) setNetfilterMode(mode NetfilterMode) error {
// address is already assigned to the interface, or if the addition
// fails.
func (r *linuxRouter) addAddress(addr netaddr.IPPrefix) error {
if !r.v6Available && addr.IP.Is6() {
return nil
}
if err := r.cmd.run("ip", "addr", "add", addr.String(), "dev", r.tunname); err != nil {
return fmt.Errorf("adding address %q to tunnel interface: %w", addr, err)
}
@ -380,6 +382,9 @@ func (r *linuxRouter) addAddress(addr netaddr.IPPrefix) error {
// the address is not assigned to the interface, or if the removal
// fails.
func (r *linuxRouter) delAddress(addr netaddr.IPPrefix) error {
if !r.v6Available && addr.IP.Is6() {
return nil
}
if err := r.delLoopbackRule(addr.IP); err != nil {
return err
}
@ -437,6 +442,9 @@ func (r *linuxRouter) delLoopbackRule(addr netaddr.IP) error {
// interface. Fails if the route already exists, or if adding the
// route fails.
func (r *linuxRouter) addRoute(cidr netaddr.IPPrefix) error {
if !r.v6Available && cidr.IP.Is6() {
return nil
}
args := []string{
"ip", "route", "add",
normalizeCIDR(cidr),
@ -452,6 +460,9 @@ func (r *linuxRouter) addRoute(cidr netaddr.IPPrefix) error {
// interface. Fails if the route doesn't exist, or if removing the
// route fails.
func (r *linuxRouter) delRoute(cidr netaddr.IPPrefix) error {
if !r.v6Available && cidr.IP.Is6() {
return nil
}
args := []string{
"ip", "route", "del",
normalizeCIDR(cidr),