What are the main similarities and differences between AF_PACKET, PCAP, RAW socket, and PF_RING technologies?

All the listed technologies are used for capturing and processing network packets, but they have different features:

• AF_PACKET — an interface in Linux for working with network packets at the kernel level, allowing direct capture and sending of packets through sockets. Used for high-performance capturing.

• PCAP — a library and file format for capturing and analyzing network packets. Usually operates in user space and uses drivers (e.g., via AF_PACKET) to obtain data. Used in tools like tcpdump, Wireshark.

• RAW socket — sockets that allow working with network protocols at a low level, sending and receiving packets with minimal OS processing. Less efficient for mass packet capturing compared to AF_PACKET.

• PF_RING — a high-performance framework for packet capturing that optimizes work with network interfaces, reducing CPU load and increasing throughput compared to traditional methods.

In brief:

• AF_PACKET and RAW socket are low-level interfaces for working with packets.
• PCAP is a library for capturing and analyzing, utilizing these interfaces.
• PF_RING is an optimized mechanism for high-performance capturing.