| 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 | |
| 13 | static 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(format: "cannot create raw socket\n"); |
| 21 | return -1; |
| 22 | } |
| 23 | |
| 24 | memset(s: &sll, c: 0, n: sizeof(sll)); |
| 25 | sll.sll_family = AF_PACKET; |
| 26 | sll.sll_ifindex = if_nametoindex(ifname: name); |
| 27 | sll.sll_protocol = htons(ETH_P_ALL); |
| 28 | if (bind(fd: sock, addr: (struct sockaddr *)&sll, len: sizeof(sll)) < 0) { |
| 29 | printf(format: "bind to %s: %s\n", name, strerror(errno)); |
| 30 | close(fd: sock); |
| 31 | return -1; |
| 32 | } |
| 33 | |
| 34 | return sock; |
| 35 | } |
| 36 |