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 } 37