struct ifinfomsg

The ifinfomsg struct is a data structure in the Linux kernel's netlink interface that is used to represent information about a network interface. It contains the following fields:

- ifi_family: The address family of the interface, such as AF_INET or AF_INET6.
- ifi_type: The type of the interface, such as ARPHRD_ETHER for Ethernet interfaces.
- ifi_index: The interface index, which is a unique identifier for the interface.
- ifi_flags: A bitmask of flags that describe the state of the interface, such as whether it is up or down.
- ifi_change: A bitmask of flags that indicate which fields of the struct have changed since the previous message was sent.

The ifinfomsg struct is typically used in conjunction with netlink messages to communicate information about network interfaces between the kernel and user-space programs. For example, a network configuration tool might use netlink messages to query the kernel for information about the available network interfaces and their properties.