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 open_raw_sock(const char * name)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