busybox

/* vi: set sw=4 ts=4: */

/*

 * iplink.c "ip link".

 *

 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>

 *

 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.

 */

​

#include "libbb.h"

​

#include <sys/ioctl.h>

#include <sys/socket.h>

​

#include <net/if.h>

#include <net/if_packet.h>

#include <netpacket/packet.h>

​

#include <net/ethernet.h>

​

#include "rt_names.h"

#include "utils.h"

#include "ip_common.h"

​

/* take from linux/sockios.h */

#define SIOCSIFNAME 0x8923      /* set interface name */

​

static int on_off(char *msg)

{

    bb_error_msg("error: argument of \"%s\" must be \"on\" or \"off\"", msg);

    return -1;

}

​

static int get_ctl_fd(void)

{

    int s_errno;

    int fd;

​

    fd = socket(PF_INET, SOCK_DGRAM, 0);

    if (fd >= 0)

        return fd;

    s_errno = errno;

    fd = socket(PF_PACKET, SOCK_DGRAM, 0);

    if (fd >= 0)

        return fd;

    fd = socket(PF_INET6, SOCK_DGRAM, 0);

    if (fd >= 0)

        return fd;

    errno = s_errno;

    perror("Cannot create control socket");

    return -1;

}

​

static int do_chflags(char *dev, __u32 flags, __u32 mask)

{

    struct ifreq ifr;

    int fd;

    int err;

​

    strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));

    fd = get_ctl_fd();

    if (fd < 0)

        return -1;