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  
ifconfig_helper(const char * if_name,int up)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  
ifconfig_up(const char * if_name)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  
iface_exists(const char * ifname)66  int iface_exists(const char *ifname)
67  {
68  	return if_nametoindex(ifname);
69  }
70