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net/captivedetection: exclude cellular data interfaces (#13002)

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Updates tailscale/tailscale#1634

This PR optimizes captive portal detection on Android and iOS by excluding cellular data interfaces (`pdp*` and `rmnet`). As cellular networks do not present captive portals, frequent network switches between Wi-Fi and cellular would otherwise trigger captive detection unnecessarily, causing battery drain.

Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
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Andrea Gottardo 2024-08-02 12:23:48 -07:00 committed by GitHub
parent f0230ce0b5
commit 4055b63b9b
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1 changed files with 7 additions and 1 deletions
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8
net/captivedetection/captivedetection.go
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@ -106,13 +106,19 @@ func (d *Detector) detectCaptivePortalWithGOOS(ctx context.Context, netMon *netm
return false
}
// interfaceNameDoesNotNeedCaptiveDetection returns true if an interface does not require captive portal detection
// based on its name. This is useful to avoid making unnecessary HTTP requests on interfaces that are known to not
// require it. We also avoid making requests on the interface prefixes "pdp" and "rmnet", which are cellular data
// interfaces on iOS and Android, respectively, and would be needlessly battery-draining.
func interfaceNameDoesNotNeedCaptiveDetection(ifName string, goos string) bool {
ifName = strings.ToLower(ifName)
excludedPrefixes := []string{"tailscale", "tun", "tap", "docker", "kube", "wg"}
if goos == "windows" {
excludedPrefixes = append(excludedPrefixes, "loopback", "tunnel", "ppp", "isatap", "teredo", "6to4")
} else if goos == "darwin" || goos == "ios" {
excludedPrefixes = append(excludedPrefixes, "awdl", "bridge", "ap", "utun", "tap", "llw", "anpi", "lo", "stf", "gif", "xhc")
excludedPrefixes = append(excludedPrefixes, "pdp", "awdl", "bridge", "ap", "utun", "tap", "llw", "anpi", "lo", "stf", "gif", "xhc", "pktap")
} else if goos == "android" {
excludedPrefixes = append(excludedPrefixes, "rmnet", "p2p", "dummy", "sit")
}
for _, prefix := range excludedPrefixes {
if strings.HasPrefix(ifName, prefix) {