Android12.0 system restricts Internet access series iptables uses IOemNetd to realize the realization of clearing all rules

1 Introduction

In the 12.0 system rom customization development, for the system to limit the use of the network, it is necessary to set the function of shielding the ip address in the product requirements of the netd network in the system. The iptables command in liunx is also more important
. Next, let’s implement the related functions of clearing all custom rules in IOemNetd

2. The iptables of the system restricting Internet access series uses IOemNetd to realize the core class of clearing all custom rules.

       system\netd\server\binder\com\android\internal\net\IOemNetd.aidl
        system\netd\server\OemNetdListener.cpp
        system\netd\server\OemNetdListener.h

3. Analysis and realization of the core functions of the iptables of the system restricting Internet access series to realize the realization of clearing all custom rules with IOemNetd

In the android native system, iptables is very important in the network filtering packet module. Iptabels is a packet filtering firewall system integrated with the Linux kernel. Both linux and android include the function of Iptables.
Iptables facilitate better control of IP packet filtering and firewall configuration on a Linux system if the Linux system is connected to the Internet or a LAN, a server, or a proxy server that connects the LAN to the Internet.
Another important advantage of netfilter/iptables is that it gives the user complete control over firewall configuration and packet filtering. You can customize your own rules to meet your specific needs

The commonly used commands of iptables are as follows:
Command Description

-L --list <chain name> View iptables rule list
-A --append <chain name>