LXR linux/samples/bpf/sock

   1#include <stdlib.h>
   2#include <stdio.h>
   3#include <linux/unistd.h>
   4#include <unistd.h>
   5#include <string.h>
   6#include <errno.h>
   7#include <linux/if_ether.h>
   8#include <net/if.h>
   9#include <linux/if_packet.h>
  10#include <arpa/inet.h>
  11#include "libbpf.h"
  12
  13static inline int open_raw_sock(const char *name)
  14{
  15        struct sockaddr_ll sll;
  16        int sock;
  17
  18        sock = socket(PF_PACKET, SOCK_RAW | SOCK_NONBLOCK | SOCK_CLOEXEC, htons(ETH_P_ALL));
  19        if (sock < 0) {
  20                printf("cannot create raw socket\n");
  21                return -1;
  22        }
  23
  24        memset(&sll, 0, sizeof(sll));
  25        sll.sll_family = AF_PACKET;
  26        sll.sll_ifindex = if_nametoindex(name);
  27        sll.sll_protocol = htons(ETH_P_ALL);
  28        if (bind(sock, (struct sockaddr *)&sll, sizeof(sll)) < 0) {
  29                printf("bind to %s: %s\n", name, strerror(errno));
  30                close(sock);
  31                return -1;
  32        }
  33
  34        return sock;
  35}
  36