The Android 11.0 system restricts the iptables of the Internet access system to use IOemNetd to realize the function of deleting the subchain

1 Introduction

In the 11.0 system rom customization development, for restricting the system's Internet access function, in the product development of the netd network in the system, it will be required to set the function of shielding the ip address. The iptables command in liunx is also more important
. Come down and implement the related functions of deleting and creating subchains in IOemNetd

2. The system restricts the core class of the iptables of the system to use IOemNetd to realize the function of deleting and creating subchains

   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 function of deleting and creating sub-chains

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 a rule at the end of the rule list
-I --inse