如何在 Linux 中使用 SOCK_RAW 接收 IPv4 数据包？

Question

How do I receive network layer (OSI Layer 3) packets in Linux? More specifically, IPv4 packets regardless of transport layer protocol (UDP, TCP, ...). Preferably in C without libraries.

Using socket(AF_INET, SOCK_RAW, IPPROTO_RAW) , I'm only able to send IPv4 packets; not receive.

Answer 1

Did you try with recvfrom from socket library. Like in this example :

sock_raw = socket(AF_INET , SOCK_RAW , protocol);
while(1)
{
    data_size = recvfrom(sock_raw , buffer , 65536 , 0 , &addr , &addr_size);
}