src/drivers/linux_ioctl.c

   1 /*
   2  * Linux ioctl helper functions for driver wrappers
   3  * Copyright (c) 2002-2010, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "utils/includes.h"
  16 #include <sys/ioctl.h>
  17 #include <net/if.h>
  18
  19 #include "utils/common.h"
  20 #include "linux_ioctl.h"
  21
  22
  23 int linux_set_iface_flags(int sock, const char *ifname, int dev_up)
  24 {
  25         struct ifreq ifr;
  26
  27         if (sock < 0)
  28                 return -1;
  29
  30         os_memset(&ifr, 0, sizeof(ifr));
  31         os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
  32
  33         if (ioctl(sock, SIOCGIFFLAGS, &ifr) != 0) {
  34                 wpa_printf(MSG_ERROR, "Could not read interface %s flags: %s",
  35                            ifname, strerror(errno));
  36                 return -1;
  37         }
  38
  39         if (dev_up) {
  40                 if (ifr.ifr_flags & IFF_UP)
  41                         return 0;
  42                 ifr.ifr_flags |= IFF_UP;
  43         } else {
  44                 if (!(ifr.ifr_flags & IFF_UP))
  45                         return 0;
  46                 ifr.ifr_flags &= ~IFF_UP;
  47         }
  48
  49         if (ioctl(sock, SIOCSIFFLAGS, &ifr) != 0) {
  50                 wpa_printf(MSG_ERROR, "Could not set interface %s flags: %s",
  51                            ifname, strerror(errno));
  52                 return -1;
  53         }
  54
  55         return 0;
  56 }