Is Netlink obsolete?

Netlink was first provided in the 2.0 series of the Linux kernel, implemented as a character device. By 2013, this interface is obsolete, but still forms an ioctl communication method; compare the use of rtnetlink .

What is Netlink in Linux?

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.

How do you use netlink sockets?

To use Netlink sockets in code, a standard socket API is used, which is as follows: int socket(int domain, int type , int protocol); Here, domain specifies the protocol family used for communication which is defined in sys/socket. h; domain in the case of Netlink is AF_NETLINK.

What is RTNL in Linux?

If you look at the source it says it’s for “Routing Netlink”. The netlink manpage says ” Netlink is used to transfer information between kernel and userspace processes.” The source for rtnl.

What is NetLink in Linux?

This article is also may be used as a good startup point. The Netlink is a socket-based Linux kernel interface used for inter-process communication (IPC) between both the kernel and userspace processes and between different userspace processes, in a way similar to the Unix domain sockets.

Where can I find the NetLink_Netfilter driver in Linux?

See Documentation/driver-api/connector.rst (or /Documentation/connector/connector.* in kernel 5.2 and earlier) in the Linux kernel source tree for further information. NETLINK_NETFILTER (since Linux 2.6.14) Netfilter subsystem.

What is Netlink_usersock in Linux?

NETLINK_USERSOCK Reserved for user-mode socket protocols. NETLINK_FIREWALL (up to and including Linux 3.4) Transport IPv4 packets from netfilter to user space. Used by ip_queue kernel module. After a long period of being declared obsolete (in favor of the more advanced nfnetlink_queue feature), NETLINK_FIREWALL was removed in Linux 3.5.

What are the currently assigned Netlink families?

The currently assigned netlink families are: NETLINK_ROUTE Receives routing and link updates and may be used to modify the routing tables (both IPv4 and IPv6), IP addresses, link parameters, neighbor setups, queueing disciplines, traffic classes, and packet classifiers (see rtnetlink (7) ).