src/ap/vlan_ifconfig.c

   1 /*
   2  * hostapd / VLAN ifconfig helpers
   3  * Copyright 2003, Instant802 Networks, Inc.
   4  * Copyright 2005-2006, Devicescape Software, Inc.
   5  * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
   6  *
   7  * This software may be distributed under the terms of the BSD license.
   8  * See README for more details.
   9  */
  10
  11 #include "utils/includes.h"
  12 #include <net/if.h>
  13 #include <sys/ioctl.h>
  14
  15 #include "utils/common.h"
  16 #include "vlan_util.h"
  17
  18
  19 int ifconfig_helper(const char *if_name, int up)
  20 {
  21         int fd;
  22         struct ifreq ifr;
  23
  24         if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
  25                 wpa_printf(MSG_ERROR, "VLAN: %s: socket(AF_INET,SOCK_STREAM) "
  26                            "failed: %s", __func__, strerror(errno));
  27                 return -1;
  28         }
  29
  30         os_memset(&ifr, 0, sizeof(ifr));
  31         os_strlcpy(ifr.ifr_name, if_name, IFNAMSIZ);
  32
  33         if (ioctl(fd, SIOCGIFFLAGS, &ifr) != 0) {
  34                 wpa_printf(MSG_ERROR, "VLAN: %s: ioctl(SIOCGIFFLAGS) failed "
  35                            "for interface %s: %s",
  36                            __func__, if_name, strerror(errno));
  37                 close(fd);
  38                 return -1;
  39         }
  40
  41         if (up)
  42                 ifr.ifr_flags |= IFF_UP;
  43         else
  44                 ifr.ifr_flags &= ~IFF_UP;
  45
  46         if (ioctl(fd, SIOCSIFFLAGS, &ifr) != 0) {
  47                 wpa_printf(MSG_ERROR, "VLAN: %s: ioctl(SIOCSIFFLAGS) failed "
  48                            "for interface %s (up=%d): %s",
  49                            __func__, if_name, up, strerror(errno));
  50                 close(fd);
  51                 return -1;
  52         }
  53
  54         close(fd);
  55         return 0;
  56 }
  57
  58
  59 int ifconfig_up(const char *if_name)
  60 {
  61         wpa_printf(MSG_DEBUG, "VLAN: Set interface %s up", if_name);
  62         return ifconfig_helper(if_name, 1);
  63 }
  64
  65
  66 int iface_exists(const char *ifname)
  67 {
  68         return if_nametoindex(ifname);
  69 }