linux_ioctl.c

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/*
 * Linux ioctl helper functions for driver wrappers
 * Copyright (c) 2002-2010, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "utils/includes.h"
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_arp.h>

#include "utils/common.h"
#include "linux_ioctl.h"


int linux_set_iface_flags(int sock, const char *ifname, int dev_up)
{
        struct ifreq ifr;

        if (sock < 0)
                return -1;

        os_memset(&ifr, 0, sizeof(ifr));
        os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);

        if (ioctl(sock, SIOCGIFFLAGS, &ifr) != 0) {
                wpa_printf(MSG_ERROR, "Could not read interface %s flags: %s",
                           ifname, strerror(errno));
                return -1;
        }

        if (dev_up) {
                if (ifr.ifr_flags & IFF_UP)
                        return 0;
                ifr.ifr_flags |= IFF_UP;
        } else {
                if (!(ifr.ifr_flags & IFF_UP))
                        return 0;
                ifr.ifr_flags &= ~IFF_UP;
        }

        if (ioctl(sock, SIOCSIFFLAGS, &ifr) != 0) {
                wpa_printf(MSG_ERROR, "Could not set interface %s flags: %s",
                           ifname, strerror(errno));
                return -1;
        }

        return 0;
}


int linux_get_ifhwaddr(int sock, const char *ifname, u8 *addr)
{
        struct ifreq ifr;

        os_memset(&ifr, 0, sizeof(ifr));
        os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
        if (ioctl(sock, SIOCGIFHWADDR, &ifr)) {
                wpa_printf(MSG_ERROR, "Could not get interface %s hwaddr: %s",
                           ifname, strerror(errno));
                return -1;
        }

        if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
                wpa_printf(MSG_ERROR, "%s: Invalid HW-addr family 0x%04x",
                           ifname, ifr.ifr_hwaddr.sa_family);
                return -1;
        }
        os_memcpy(addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);

        return 0;
}


int linux_set_ifhwaddr(int sock, const char *ifname, const u8 *addr)
{
        struct ifreq ifr;

        os_memset(&ifr, 0, sizeof(ifr));
        os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
        os_memcpy(ifr.ifr_hwaddr.sa_data, addr, ETH_ALEN);
        ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;

        if (ioctl(sock, SIOCSIFHWADDR, &ifr)) {
                wpa_printf(MSG_DEBUG, "Could not set interface %s hwaddr: %s",
                           ifname, strerror(errno));
                return -1;
        }

        return 0;
}


#ifndef SIOCBRADDBR
#define SIOCBRADDBR 0x89a0
#endif
#ifndef SIOCBRDELBR
#define SIOCBRDELBR 0x89a1
#endif
#ifndef SIOCBRADDIF
#define SIOCBRADDIF 0x89a2
#endif
#ifndef SIOCBRDELIF
#define SIOCBRDELIF 0x89a3
#endif


int linux_br_add(int sock, const char *brname)
{
        if (ioctl(sock, SIOCBRADDBR, brname) < 0) {
                wpa_printf(MSG_DEBUG, "Could not add bridge %s: %s",
                           brname, strerror(errno));
                return -1;
        }

        return 0;
}


int linux_br_del(int sock, const char *brname)
{
        if (ioctl(sock, SIOCBRDELBR, brname) < 0) {
                wpa_printf(MSG_DEBUG, "Could not remove bridge %s: %s",
                           brname, strerror(errno));
                return -1;
        }

        return 0;
}


int linux_br_add_if(int sock, const char *brname, const char *ifname)
{
        struct ifreq ifr;
        int ifindex;

        ifindex = if_nametoindex(ifname);
        if (ifindex == 0)
                return -1;

        os_memset(&ifr, 0, sizeof(ifr));
        os_strlcpy(ifr.ifr_name, brname, IFNAMSIZ);
        ifr.ifr_ifindex = ifindex;
        if (ioctl(sock, SIOCBRADDIF, &ifr) < 0) {
                wpa_printf(MSG_DEBUG, "Could not add interface %s into bridge "
                           "%s: %s", ifname, brname, strerror(errno));
                return -1;
        }

        return 0;
}


int linux_br_del_if(int sock, const char *brname, const char *ifname)
{
        struct ifreq ifr;
        int ifindex;

        ifindex = if_nametoindex(ifname);
        if (ifindex == 0)
                return -1;

        os_memset(&ifr, 0, sizeof(ifr));
        os_strlcpy(ifr.ifr_name, brname, IFNAMSIZ);
        ifr.ifr_ifindex = ifindex;
        if (ioctl(sock, SIOCBRDELIF, &ifr) < 0) {
                wpa_printf(MSG_DEBUG, "Could not remove interface %s from "
                           "bridge %s: %s", ifname, brname, strerror(errno));
                return -1;
        }

        return 0;
}


int linux_br_get(char *brname, const char *ifname)
{
        char path[128], brlink[128], *pos;
        os_snprintf(path, sizeof(path), "/sys/class/net/%s/brport/bridge",
                    ifname);
        os_memset(brlink, 0, sizeof(brlink));
        if (readlink(path, brlink, sizeof(brlink) - 1) < 0)
                return -1;
        pos = os_strrchr(brlink, '/');
        if (pos == NULL)
                return -1;
        pos++;
        os_strlcpy(brname, pos, IFNAMSIZ);
        return 0;
}