Android10.0 iptables uses IOemNetd to implement the function of creating subchains

1 Introduction

In the 10.0 system rom customization development, in the product requirements 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. Next, I will come to IOemNetd Realize the related functions of creating subchains

2. iptables uses IOemNetd to implement the core class of the realization of the function of creating subchains

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

3. Analysis and implementation of the core function of iptables using IOemNetd to realize the realization of the function of creating a subchain

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 --insert <chain name> Insert a rule at the specified position
-D --