Module netlink 

Netlink-style interface for userland-kernel network configuration IPC

Provides a message-passing mechanism between userland network daemons (such as the NetworkManager shim) and the kernel network stack. Messages use an integer-based serialization format suitable for no-std environments.

Message Format

Each netlink message is serialized as a fixed-size header followed by a variable-length payload:

+--------+--------+--------+--------+--------+--------+--...--+
| type   | flags  | seq    | pid    | length | payload        |
| u16    | u16    | u32    | u32    | u32    | [u8; length]   |
+--------+--------+--------+--------+--------+--...--+

Supported Operations

• Link management: bring interfaces up/down, query link state
• Address management: add/remove IPv4/IPv6 addresses
• Route management: add/remove routes, set default gateway
• Device enumeration: list interfaces and their properties

Modules

flags

Message flags (bitmask)

Structs

AddrInfo

IP address entry (serialized in NewAddr responses)

LinkInfo

Network interface information (serialized in NewLink responses)

NetlinkHeader

Fixed-size netlink message header (16 bytes)

NetlinkMessage

Complete netlink message (header + payload)

NetlinkSocket

Netlink socket for message passing between kernel and userland

RouteInfo

Route entry (serialized in NewRoute responses)

Enums

NetlinkMessageType

Netlink message type codes

Functions

init

Initialize the netlink subsystem

netlink_close

Close a netlink socket

netlink_open

Open a new netlink socket

netlink_recv

Receive a netlink message (kernel -> userland)

netlink_send

Send a netlink message (userland -> kernel)