Linux network code learning

Linux network code learning-Linux Enterprise Application-Linux server application information. For details, refer to the following section. Linux network interfaces are divided into four parts: network device interface, network interface core, network protocol family, and network interface socket layer.

The network device interface is mainly responsible for receiving and sending data from physical media. The implemented file is under the linu/driver/net directory.

The core part of the network interface is the key part of the entire network interface. It provides a unified sending interface for the network protocol and shields various physical media, at the same time, it is responsible for distributing packets from lower layers to appropriate protocols. It is the central part of the network interface. Its main implementation files are in the linux/net/core directory, where linux/net/core/dev. c is the main file for management.

The network protocol family is part of the implementation of various specific protocols. Linux supports TCP/IP, IPX, X.25, AppleTalk, and other protocols. The source code of various protocols is named in the linux/net/directory. Here we mainly discuss the TCP/IP (IPv4) protocol. The source code is linux/net/ipv4, and linux/net/ipv4/af_inet.c is the main file management.

The network interface Socket layer is the programming interface for network services provided by users. The main source code is in linux/net/socket. c