36 lines · c
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 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