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netns: add Android callback to bind socket to network (#18915)

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After switching from cellular to wifi without ipv6, ForeachInterface still sees rmnet prefixes, so HaveV6 stays true, and magicsock keeps attempting ipv6 connections that either route through cellular or time out for users on wifi without ipv6

This:
-Adds SetAndroidBindToNetworkFunc, a callback to bind the socket to the selected Android Network object

Updates tailscale/tailscale#6152

Signed-off-by: kari-ts <kari@tailscale.com>
This commit is contained in:
kari-ts
2026-03-11 12:28:28 -07:00
committed by GitHub
parent dd1da0b389
commit 4c7c1091ba
4 changed files with 59 additions and 4 deletions
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net/netns/netns.go
+12
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@@ -46,6 +46,18 @@ func SetBindToInterfaceByRoute(logf logger.Logf, v bool) {
}
}
// When true, disableAndroidBindToActiveNetwork skips binding sockets to the currently
// active network on Android.
var disableAndroidBindToActiveNetwork atomic.Bool
// SetDisableAndroidBindToActiveNetwork disables the default behavior of binding
// sockets to the currently active network on Android.
func SetDisableAndroidBindToActiveNetwork(logf logger.Logf, v bool) {
if runtime.GOOS == "android" && disableAndroidBindToActiveNetwork.Swap(v) != v {
logf("netns: disableAndroidBindToActiveNetwork changed to %v", v)
}
}
var disableBindConnToInterface atomic.Bool
// SetDisableBindConnToInterface disables the (normal) behavior of binding