Android11.0 system restricts Internet access system iptables uses IOemNetd to realize the realization of shielding ip blacklist

1 Introduction

In the 11.0 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, IOemNetd will realize the related functions of clearing all custom
rules

2. The system restricts the core class of the iptables of the system to use IOemNetd to realize the function 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. The system restricts the core function analysis and implementation of the iptables of the system to use IOemNetd to realize the realization of the function of clearing all custom rules

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> Add 1 at the end of the rule list