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net/netns: don't log errors when we can't get the default route on Darwin

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It's somewhat common (e.g. when a phone has no reception), and leads to
lots of logspam.

Updates #7850

Signed-off-by: Mihai Parparita <mihai@tailscale.com>
This commit is contained in:
Mihai Parparita 2023-04-18 09:44:59 -07:00 committed by Mihai Parparita
parent 280255acae
commit c7cea825ae
2 changed files with 11 additions and 2 deletions
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6
net/interfaces/interfaces_bsd.go
View File

@ -35,6 +35,10 @@ func defaultRoute() (d DefaultRouteDetails, err error) {
return d, nil
}
// ErrNoGatewayIndexFound is returned by DefaultRouteInterfaceIndex when no
// default route is found.
var ErrNoGatewayIndexFound = errors.New("no gateway index found")
// DefaultRouteInterfaceIndex returns the index of the network interface that
// owns the default route. It returns the first IPv4 or IPv6 default route it
// finds (it does not prefer one or the other).
@ -75,7 +79,7 @@ func DefaultRouteInterfaceIndex() (int, error) {
return rm.Index, nil
}
}
return 0, errors.New("no gateway index found")
return 0, ErrNoGatewayIndexFound
}
func init() {

7
net/netns/netns_darwin.go
View File

@ -61,7 +61,12 @@ func getInterfaceIndex(logf logger.Logf, address string) (int, error) {
defaultIdx := func() (int, error) {
idx, err := interfaces.DefaultRouteInterfaceIndex()
if err != nil {
logf("[unexpected] netns: DefaultRouteInterfaceIndex: %v", err)
// It's somewhat common for there to be no default gateway route
// (e.g. on a phone with no connectivity), don't log those errors
// since they are expected.
if !errors.Is(err, interfaces.ErrNoGatewayIndexFound) {
logf("[unexpected] netns: DefaultRouteInterfaceIndex: %v", err)
}
return -1, err
}
return idx, nil