samples/bpf/sock_example.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include <linux/unistd.h>
   5 #include <unistd.h>
   6 #include <string.h>
   7 #include <errno.h>
   8 #include <linux/if_ether.h>
   9 #include <net/if.h>
  10 #include <linux/if_packet.h>
  11 #include <arpa/inet.h>
  12 #include "libbpf.h"
  13
  14 static inline int open_raw_sock(const char *name)
  15 {
  16         struct sockaddr_ll sll;
  17         int sock;
  18
  19         sock = socket(PF_PACKET, SOCK_RAW | SOCK_NONBLOCK | SOCK_CLOEXEC, htons(ETH_P_ALL));
  20         if (sock < 0) {
  21                 printf("cannot create raw socket\n");
  22                 return -1;
  23         }
  24
  25         memset(&sll, 0, sizeof(sll));
  26         sll.sll_family = AF_PACKET;
  27         sll.sll_ifindex = if_nametoindex(name);
  28         sll.sll_protocol = htons(ETH_P_ALL);
  29         if (bind(sock, (struct sockaddr *)&sll, sizeof(sll)) < 0) {
  30                 printf("bind to %s: %s\n", name, strerror(errno));
  31                 close(sock);
  32                 return -1;
  33         }
  34
  35         return sock;
  36 }