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