Google has created a new firewall chain — a set of rules that the Linux iptables utility follows to allow or block network traffic — to support restricted networking mode.
Effectively, this means that you’ll still receive push notifications from apps using Firebase Cloud Messaging (FCM), as these notifications are routed through the privileged Google Play Services app that holds the requisite permission, but no other app — excluding a handful of other system apps — can send or receive data in the background.
We don’t quite know where Google will place a toggle for restricted networking mode in Android 12!We know it can be toggled at runtime and programmatically queried via shell command, much like Android’s Data Saver feature, but we don’t know if Google plans to let users make their own allowlist/blocklist of apps.
XDA » News Brief » Google adds a Restricted Networking Mode in Android 12?
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