如何进行Netlink源码及实例的分析

Netlink is a communication mechanism between the kernel and user space processes. It allows user space processes to request services from the kernel and receive notifications from the kernel.

Netlink is divided into several families, each of which is designed for a specific purpose. For example, the NETLINK_ROUTE family is used for IP routing and link layer configuration, while the NETLINK_GENERIC family can be used for generic kernel-user space communication.

When a user space process wants to communicate with the kernel using Netlink, it first creates a Netlink socket. This is done using the socket() system call, specifying the appropriate Netlink family as the socket type.

Once the socket has been created, the process can use the sendto() or sendmsg() system calls to send messages to the kernel, and the recvfrom() or recvmsg() system calls to receive messages from the kernel.

The format of Netlink messages is similar to that of other types of IPC messages (e.g. messages passed between processes using the System V IPC mechanisms). Each message has a header, followed by a variable-length payload.

The header contains a type field, which specifies the type of message, and a length field, which specifies the total length of the message (header + payload).

The payload of a Netlink message is typically a sequence of attributes. Each attribute has a type and a length, and contains a variable-length value.

When a user space process wants to communicate with the kernel using Netlink, it must first create a Netlink socket. This is done using the socket() system call, specifying the appropriate Netlink family as the socket type.

Once the socket has been created, the process can use the sendto() or sendmsg() system calls to send messages to the kernel, and the recvfrom() or recvmsg() system calls to receive messages from the kernel.

The format of Netlink messages is similar to that of other types of IPC messages (e.g. messages passed between processes using the System V IPC mechanisms). Each message has a header, followed by a variable-length payload.

The header contains a type field, which specifies the type of message, and a length field, which specifies the total length of the message (header + payload).

The payload of a Netlink message is typically a sequence of attributes. Each attribute has a type and a length, and contains a variable-length value.