Linux network programming - Netlink socket and Netfilter- Part 1 | Linux kernel | Youtube

Linux network programming - Netlink socket and Netfilter- Part 1

Linux network programming refers to the development of applications that communicate over a network using Linux-based operating systems. It involves the use of various protocols and APIs such as sockets, Netlink, and Netfilter to establish and manage network connections, send and receive data, and monitor network traffic.

Developers can use programming languages such as C, C++, Python, and Java to write network applications on Linux. Sockets are a popular API for network programming on Linux and are used to establish TCP/IP connections, send and receive data, and perform other network-related tasks. Netlink sockets, on the other hand, are used for communication between user-space processes and the kernel for networking-related tasks.

Netfilter is a specific implementation of Netlink used for managing and monitoring network traffic in Linux-based systems. It provides a standardized interface that enables user-space applications to access and interact with various kernel-level services and features related to networking.

Netlink is used to transfer information between the kernel and user-space processes. It consists of a standard sockets-based interface for user space processes and an internal kernel API for kernel modules. The internal kernel interface is not documented in this manual page. There is also an obsolete netlink interface via netlink character devices; this interface is not documented here and is provided only for backward compatibility.

Package netfilter provides encoding and decoding of Netlink messages into Netfilter attributes. It handles Netfilter-specific nesting of attributes, endianness, and is written around a native Netlink implementation

A Netlink socket is a type of socket used for communication between the kernel and user-space processes in Linux. It is used for various purposes, including network-related tasks such as routing, firewalling, and traffic control. Netlink sockets use a standardized communication protocol that allows for the exchange of messages between the kernel and user-space processes. These messages may contain information such as configuration data, status updates, or requests for specific actions to be taken. The Netlink protocol is implemented using a set of generic Netlink functions that can be used by different subsystems to communicate with user-space processes.

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