/* Copyright (C) 2010 Open Information Security Foundation

 *

 * You can copy, redistribute or modify this Program under the terms of

 * the GNU General Public License version 2 as published by the Free

 * Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * version 2 along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

 * 02110-1301, USA.

 */

/**

 * \file

 *

 * \author Eric Leblond <eric@regit.org>

 * \author Victor Julien <victor@inliniac.net>

 */

#include "suricata-common.h"

#include "util-ioctl.h"

#include "conf.h"

#include "decode.h"

#include "decode-sll.h"

#ifdef HAVE_SYS_IOCTL_H

#include <sys/ioctl.h>

#endif

#ifdef HAVE_LINUX_ETHTOOL_H

#include <linux/types.h>

#include <linux/ethtool.h>

#ifdef HAVE_LINUX_SOCKIOS_H

#include <linux/sockios.h>

#else

#error "ethtool.h present but sockios.h is missing"

#endif /* HAVE_LINUX_SOCKIOS_H */

#endif /* HAVE_LINUX_ETHTOOL_H */

#ifdef HAVE_NET_IF_H

#include <net/if.h>

#endif

#ifdef OS_WIN32

#include "win32-syscall.h"

#endif

/**

 * \brief output a majorant of hardware header length

 *

 * \param Name of a network interface

 */

static int GetIfaceMaxHWHeaderLength(const char *dev)

{

    if ((!strcmp("eth", dev)) || (!strcmp("br", dev)) || (!strcmp("bond", dev)) ||

            (!strcmp("wlan", dev)) || (!strcmp("tun", dev)) || (!strcmp("tap", dev)) ||

            (!strcmp("lo", dev))) {

        /* Add possible VLAN tag or Qing headers */

        return 8 + ETHERNET_HEADER_LEN;

    }

    if (!strcmp("ppp", dev))

        return SLL_HEADER_LEN;

    /* SLL_HEADER_LEN is the biggest one and

       add possible VLAN tag and Qing headers */

    return 8 + SLL_HEADER_LEN;

}

/**

 * \brief output the link MTU

 *

 * \param Name of link

 * \retval -1 in case of error, 0 if MTU can not be found

 */

int GetIfaceMTU(const char *dev)

{

#if defined SIOCGIFMTU

    struct ifreq ifr;

    int fd;

    (void)strlcpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));

    fd = socket(AF_INET, SOCK_DGRAM, 0);

    if (fd == -1) {

        return -1;

    }

    if (ioctl(fd, SIOCGIFMTU, (char *)&ifr) < 0) {

        SCLogWarning("Failure when trying to get MTU via ioctl for '%s': %s (%d)", dev,

                strerror(errno), errno);

        close(fd);

        return -1;

    }

    close(fd);

    SCLogInfo("%s: MTU %d", dev, ifr.ifr_mtu);

    return ifr.ifr_mtu;

#elif defined OS_WIN32

    return GetIfaceMTUWin32(dev);

#else

    /* ioctl is not defined, let's pretend returning 0 is ok */

    return 0;

#endif

}

/**

 * \brief output max packet size for a link

 *

 * This does a best effort to find the maximum packet size

 * for the link. In case of uncertainty, it will output a

 * majorant to be sure avoid the cost of dynamic allocation.

 *

 * \param LiveDevice object

 * \retval 0 in case of error

 */

int GetIfaceMaxPacketSize(LiveDevice *ld)

{

    if (ld == NULL)

        return 0;

    const char *dev = ld->dev;

    if ((dev == NULL) || strlen(dev) == 0)

        return 0;

    int mtu = GetIfaceMTU(dev);

    switch (mtu) {

        case 0:

        case -1:

            return 0;

    }

    ld->mtu = mtu;

    int ll_header = GetIfaceMaxHWHeaderLength(dev);

    return ll_header + mtu;

}

#ifdef SIOCGIFFLAGS

/**

 * \brief Get interface flags.

 * \param ifname Interface name.

 * \return Interface flags or -1 on error

 */

int GetIfaceFlags(const char *ifname)

{

    struct ifreq ifr;

    int fd = socket(AF_INET, SOCK_DGRAM, 0);

    if (fd < 0) {

        return -1;

    }

    memset(&ifr, 0, sizeof(ifr));

    strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));

    if (ioctl(fd, SIOCGIFFLAGS, &ifr) == -1) {

        SCLogError("%s: failed to get device flags: %s", ifname, strerror(errno));

        close(fd);

        return -1;

    }

    close(fd);

#ifdef OS_FREEBSD

    int flags = (ifr.ifr_flags & 0xffff) | (ifr.ifr_flagshigh << 16);

    return flags;

#else

    return ifr.ifr_flags;

#endif

}

#endif

#ifdef SIOCSIFFLAGS

/**

 * \brief Set interface flags.

 * \param ifname Interface name.

 * \param flags Flags to set.

 * \return Zero on success.

 */

int SetIfaceFlags(const char *ifname, int flags)

{

    struct ifreq ifr;

    int fd = socket(AF_INET, SOCK_DGRAM, 0);

    if (fd < 0) {

        return -1;

    }

    memset(&ifr, 0, sizeof(ifr));

    strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));

#ifdef OS_FREEBSD

    ifr.ifr_flags = flags & 0xffff;

    ifr.ifr_flagshigh = flags >> 16;

#else

    ifr.ifr_flags = (uint16_t)flags;

#endif

    if (ioctl(fd, SIOCSIFFLAGS, &ifr) == -1) {

        SCLogError("%s: unable to set device flags: %s", ifname, strerror(errno));

        close(fd);

        return -1;

    }

    close(fd);

    return 0;

}

#endif /* SIOCGIFFLAGS */

#ifdef SIOCGIFCAP

int GetIfaceCaps(const char *ifname)

{

    struct ifreq ifr;

    int fd = socket(AF_INET, SOCK_DGRAM, 0);

    if (fd < 0) {

        return -1;

    }

    memset(&ifr, 0, sizeof(ifr));

    strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));

    if (ioctl(fd, SIOCGIFCAP, &ifr) == -1) {

        SCLogError("%s: unable to get device caps: %s", ifname, strerror(errno));

        close(fd);

        return -1;

    }

    close(fd);

    return ifr.ifr_curcap;

}

#endif

#ifdef SIOCSIFCAP

int SetIfaceCaps(const char *ifname, int caps)

{

    struct ifreq ifr;

    int fd = socket(AF_INET, SOCK_DGRAM, 0);

    if (fd < 0) {

        return -1;

    }

    memset(&ifr, 0, sizeof(ifr));

    strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));

    ifr.ifr_reqcap = caps;

    if (ioctl(fd, SIOCSIFCAP, &ifr) == -1) {

        SCLogError("%s: unable to set caps: %s", ifname, strerror(errno));

        close(fd);

        return -1;

    }

    close(fd);

    return 0;

}

#endif

#if defined HAVE_LINUX_ETHTOOL_H && defined SIOCETHTOOL

static int GetEthtoolValue(const char *dev, int cmd, uint32_t *value)

{

    struct ifreq ifr;

    int fd;

    struct ethtool_value ethv;

    fd = socket(AF_INET, SOCK_DGRAM, 0);

    if (fd == -1) {

        return -1;

    }

    (void)strlcpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));

    ethv.cmd = cmd;

    ifr.ifr_data = (void *) &ethv;

    if (ioctl(fd, SIOCETHTOOL, (char *)&ifr) < 0) {

        SCLogWarning("%s: failed to get SIOCETHTOOL ioctl: %s", dev, strerror(errno));

        close(fd);

        return -1;

    }

    *value = ethv.data;

    close(fd);

    return 0;

}

static int SetEthtoolValue(const char *dev, int cmd, uint32_t value)

{

    struct ifreq ifr;

    int fd;

    struct ethtool_value ethv;

    fd = socket(AF_INET, SOCK_DGRAM, 0);

    if (fd == -1) {

        return -1;

    }

    (void)strlcpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));

    ethv.cmd = cmd;

    ethv.data = value;

    ifr.ifr_data = (void *) &ethv;

    if (ioctl(fd, SIOCETHTOOL, (char *)&ifr) < 0) {

        SCLogWarning("%s: failed to set SIOCETHTOOL ioctl: %s", dev, strerror(errno));

        close(fd);

        return -1;

    }

    close(fd);

    return 0;

}

static int GetIfaceOffloadingLinux(const char *dev, int csum, int other)

{

    int ret = 0;

    uint32_t value = 0;

    if (csum) {

        const char *rx = "unset", *tx = "unset";

        int csum_ret = 0;

#ifdef ETHTOOL_GRXCSUM

        if (GetEthtoolValue(dev, ETHTOOL_GRXCSUM, &value) == 0 && value != 0) {

            rx = "SET";

            csum_ret = 1;

        }

#endif

#ifdef ETHTOOL_GTXCSUM

        if (GetEthtoolValue(dev, ETHTOOL_GTXCSUM, &value) == 0 && value != 0) {

            tx = "SET";

            csum_ret = 1;

        }

#endif

        if (csum_ret == 0)

            SCLogPerf("%s: NIC offloading: RX %s TX %s", dev, rx, tx);

        else {

            SCLogWarning("%s: NIC offloading: RX %s TX %s. Run: ethtool -K %s rx off tx off", dev,

                    rx, tx, dev);

            ret = 1;

        }

    }

    if (other) {

        const char *lro = "unset", *gro = "unset", *tso = "unset", *gso = "unset";

        const char *sg = "unset";

        int other_ret = 0;

#ifdef ETHTOOL_GGRO

        if (GetEthtoolValue(dev, ETHTOOL_GGRO, &value) == 0 && value != 0) {

            gro = "SET";

            other_ret = 1;

        }

#endif

#ifdef ETHTOOL_GTSO

        if (GetEthtoolValue(dev, ETHTOOL_GTSO, &value) == 0 && value != 0) {

            tso = "SET";

            other_ret = 1;

        }

#endif

#ifdef ETHTOOL_GGSO

        if (GetEthtoolValue(dev, ETHTOOL_GGSO, &value) == 0 && value != 0) {

            gso = "SET";

            other_ret = 1;

        }

#endif

#ifdef ETHTOOL_GSG

        if (GetEthtoolValue(dev, ETHTOOL_GSG, &value) == 0 && value != 0) {

            sg = "SET";

            other_ret = 1;

        }

#endif

#ifdef ETHTOOL_GFLAGS

        if (GetEthtoolValue(dev, ETHTOOL_GFLAGS, &value) == 0) {

            if (value & ETH_FLAG_LRO) {

                lro = "SET";

                other_ret = 1;

            }

        }

#endif

        if (other_ret == 0) {

            SCLogPerf("%s: NIC offloading: SG: %s, GRO: %s, LRO: %s, TSO: %s, GSO: %s", dev, sg,

                    gro, lro, tso, gso);

        } else {

            SCLogWarning("%s: NIC offloading: SG: %s, GRO: %s, LRO: %s, TSO: %s, GSO: %s. Run: "

                         "ethtool -K %s sg off gro off lro off tso off gso off",

                    dev, sg, gro, lro, tso, gso, dev);

            ret = 1;

        }

    }

    return ret;

}

static int DisableIfaceOffloadingLinux(LiveDevice *ldev, int csum, int other)

{

    int ret = 0;

    uint32_t value = 0;

    if (ldev == NULL)

        return -1;

    const char *dev = ldev->dev;

    if (csum) {

#ifdef ETHTOOL_GRXCSUM

        if (GetEthtoolValue(dev, ETHTOOL_GRXCSUM, &value) == 0 && value != 0) {

            SCLogPerf("%s: disabling rxcsum offloading", dev);

            SetEthtoolValue(dev, ETHTOOL_SRXCSUM, 0);

            ldev->offload_orig |= OFFLOAD_FLAG_RXCSUM;

        }

#endif

#ifdef ETHTOOL_GTXCSUM

        if (GetEthtoolValue(dev, ETHTOOL_GTXCSUM, &value) == 0 && value != 0) {

            SCLogPerf("%s: disabling txcsum offloading", dev);

            SetEthtoolValue(dev, ETHTOOL_STXCSUM, 0);

            ldev->offload_orig |= OFFLOAD_FLAG_TXCSUM;

        }

#endif

    }

    if (other) {

#ifdef ETHTOOL_GGRO

        if (GetEthtoolValue(dev, ETHTOOL_GGRO, &value) == 0 && value != 0) {

            SCLogPerf("%s: disabling gro offloading", dev);

            SetEthtoolValue(dev, ETHTOOL_SGRO, 0);

            ldev->offload_orig |= OFFLOAD_FLAG_GRO;

        }

#endif

#ifdef ETHTOOL_GTSO

        if (GetEthtoolValue(dev, ETHTOOL_GTSO, &value) == 0 && value != 0) {

            SCLogPerf("%s: disabling tso offloading", dev);

            SetEthtoolValue(dev, ETHTOOL_STSO, 0);

            ldev->offload_orig |= OFFLOAD_FLAG_TSO;

        }

#endif

#ifdef ETHTOOL_GGSO

        if (GetEthtoolValue(dev, ETHTOOL_GGSO, &value) == 0 && value != 0) {

            SCLogPerf("%s: disabling gso offloading", dev);

            SetEthtoolValue(dev, ETHTOOL_SGSO, 0);

            ldev->offload_orig |= OFFLOAD_FLAG_GSO;

        }

#endif

#ifdef ETHTOOL_GSG

        if (GetEthtoolValue(dev, ETHTOOL_GSG, &value) == 0 && value != 0) {

            SCLogPerf("%s: disabling sg offloading", dev);

            SetEthtoolValue(dev, ETHTOOL_SSG, 0);

            ldev->offload_orig |= OFFLOAD_FLAG_SG;

        }

#endif

#ifdef ETHTOOL_GFLAGS

        if (GetEthtoolValue(dev, ETHTOOL_GFLAGS, &value) == 0) {

            if (value & ETH_FLAG_LRO) {

                SCLogPerf("%s: disabling lro offloading", dev);

                SetEthtoolValue(dev, ETHTOOL_SFLAGS, value & ~ETH_FLAG_LRO);

                ldev->offload_orig |= OFFLOAD_FLAG_LRO;

            }

        }

#endif

    }

    return ret;

}

static int RestoreIfaceOffloadingLinux(LiveDevice *ldev)

{

    if (ldev == NULL)

        return -1;

    const char *dev = ldev->dev;

#ifdef ETHTOOL_GRXCSUM

    if (ldev->offload_orig & OFFLOAD_FLAG_RXCSUM) {

        SCLogPerf("%s: restoring rxcsum offloading", dev);

        SetEthtoolValue(dev, ETHTOOL_SRXCSUM, 1);

    }

#endif

#ifdef ETHTOOL_GTXCSUM

    if (ldev->offload_orig & OFFLOAD_FLAG_TXCSUM) {

        SCLogPerf("%s: restoring txcsum offloading", dev);

        SetEthtoolValue(dev, ETHTOOL_STXCSUM, 1);

    }

#endif

#ifdef ETHTOOL_GGRO

    if (ldev->offload_orig & OFFLOAD_FLAG_GRO) {

        SCLogPerf("%s: restoring gro offloading", dev);

        SetEthtoolValue(dev, ETHTOOL_SGRO, 1);

    }

#endif

#ifdef ETHTOOL_GTSO

    if (ldev->offload_orig & OFFLOAD_FLAG_TSO) {

        SCLogPerf("%s: restoring tso offloading", dev);

        SetEthtoolValue(dev, ETHTOOL_STSO, 1);

    }

#endif

#ifdef ETHTOOL_GGSO

    if (ldev->offload_orig & OFFLOAD_FLAG_GSO) {

        SCLogPerf("%s: restoring gso offloading", dev);

        SetEthtoolValue(dev, ETHTOOL_SGSO, 1);

    }

#endif

#ifdef ETHTOOL_GSG

    if (ldev->offload_orig & OFFLOAD_FLAG_SG) {

        SCLogPerf("%s: restoring sg offloading", dev);

        SetEthtoolValue(dev, ETHTOOL_SSG, 1);

    }

#endif

#ifdef ETHTOOL_GFLAGS

    if (ldev->offload_orig & OFFLOAD_FLAG_LRO) {

        uint32_t value = 0;

        if (GetEthtoolValue(dev, ETHTOOL_GFLAGS, &value) == 0) {

            SCLogPerf("%s: restoring lro offloading", dev);

            SetEthtoolValue(dev, ETHTOOL_SFLAGS, value & ETH_FLAG_LRO);

        }

    }

#endif

    return 0;

}

#endif /* defined HAVE_LINUX_ETHTOOL_H && defined SIOCETHTOOL */

#ifdef SIOCGIFCAP

static int GetIfaceOffloadingBSD(const char *ifname)

{

    int ret = 0;

    int if_caps = GetIfaceCaps(ifname);

    if (if_caps == -1) {

        return -1;

    }

    SCLogDebug("if_caps %X", if_caps);

    if (if_caps & IFCAP_RXCSUM) {

        SCLogWarning("%s: RXCSUM activated can lead to capture problems. Run: ifconfig %s -rxcsum",

                ifname, ifname);

        ret = 1;

    }

#ifdef IFCAP_TOE

    if (if_caps & (IFCAP_TSO|IFCAP_TOE|IFCAP_LRO)) {

        SCLogWarning("%s: TSO, TOE or LRO activated can lead to capture problems. Run: ifconfig %s "

                     "-tso -toe -lro",

                ifname, ifname);

        ret = 1;

    }

#else

    if (if_caps & (IFCAP_TSO|IFCAP_LRO)) {

        SCLogWarning(

                "%s: TSO or LRO activated can lead to capture problems. Run: ifconfig %s -tso -lro",

                ifname, ifname);

        ret = 1;

    }

#endif

    return ret;

}

#endif

#ifdef SIOCSIFCAP

static int DisableIfaceOffloadingBSD(LiveDevice *ldev)

{

    int ret = 0;

    if (ldev == NULL)

        return -1;

    const char *ifname = ldev->dev;

    int if_caps = GetIfaceCaps(ifname);

    int set_caps = if_caps;

    if (if_caps == -1) {

        return -1;

    }

    SCLogDebug("if_caps %X", if_caps);

    if (if_caps & IFCAP_RXCSUM) {

        SCLogPerf("%s: disabling rxcsum offloading", ifname);

        set_caps &= ~IFCAP_RXCSUM;

    }

    if (if_caps & IFCAP_TXCSUM) {

        SCLogPerf("%s: disabling txcsum offloading", ifname);

        set_caps &= ~IFCAP_TXCSUM;

    }

#ifdef IFCAP_RXCSUM_IPV6

    if (if_caps & IFCAP_RXCSUM_IPV6) {

        SCLogPerf("%s: disabling rxcsum6 offloading", ifname);

        set_caps &= ~IFCAP_RXCSUM_IPV6;

    }

#endif

#ifdef IFCAP_TXCSUM_IPV6

    if (if_caps & IFCAP_TXCSUM_IPV6) {

        SCLogPerf("%s: disabling txcsum6 offloading", ifname);

        set_caps &= ~IFCAP_TXCSUM_IPV6;

    }

#endif

#ifdef IFCAP_TOE

    if (if_caps & (IFCAP_TSO|IFCAP_TOE|IFCAP_LRO)) {

        SCLogPerf("%s: disabling tso|toe|lro offloading", ifname);

        set_caps &= ~(IFCAP_TSO|IFCAP_LRO);

    }

#else

    if (if_caps & (IFCAP_TSO|IFCAP_LRO)) {

        SCLogPerf("%s: disabling tso|lro offloading", ifname);

        set_caps &= ~(IFCAP_TSO|IFCAP_LRO);

    }

#endif

    if (set_caps != if_caps) {

        if (if_caps & IFCAP_RXCSUM)

            ldev->offload_orig |= OFFLOAD_FLAG_RXCSUM;

        if (if_caps & IFCAP_TSO)

            ldev->offload_orig |= OFFLOAD_FLAG_TSO;

#ifdef IFCAP_TOE

        if (if_caps & IFCAP_TOE)

            ldev->offload_orig |= OFFLOAD_FLAG_TOE;

#endif

        if (if_caps & IFCAP_LRO)

            ldev->offload_orig |= OFFLOAD_FLAG_LRO;

        SetIfaceCaps(ifname, set_caps);

    }

    return ret;

}

static int RestoreIfaceOffloadingBSD(LiveDevice *ldev)

{

    int ret = 0;

    if (ldev == NULL)

        return -1;

    const char *ifname = ldev->dev;

    int if_caps = GetIfaceCaps(ifname);

    int set_caps = if_caps;

    if (if_caps == -1) {

        return -1;

    }

    SCLogDebug("if_caps %X", if_caps);

    if (ldev->offload_orig & OFFLOAD_FLAG_RXCSUM) {

        SCLogPerf("%s: restoring rxcsum offloading", ifname);

        set_caps |= IFCAP_RXCSUM;

    }

    if (ldev->offload_orig & OFFLOAD_FLAG_TSO) {

        SCLogPerf("%s: restoring tso offloading", ifname);

        set_caps |= IFCAP_TSO;

    }

#ifdef IFCAP_TOE

    if (ldev->offload_orig & OFFLOAD_FLAG_TOE) {

        SCLogPerf("%s: restoring toe offloading", ifname);

        set_caps |= IFCAP_TOE;

    }

#endif

    if (ldev->offload_orig & OFFLOAD_FLAG_LRO) {

        SCLogPerf("%s: restoring lro offloading", ifname);

        set_caps |= IFCAP_LRO;

    }

    if (set_caps != if_caps) {

        SetIfaceCaps(ifname, set_caps);

    }

    return ret;

}

#endif

/**

 * \brief output offloading status of the link

 *

 * Test interface for offloading features. If one of them is

 * activated then suricata mays received packets merge at reception.

 * The result is oversized packets and this may cause some serious

 * problem in some capture mode where the size of the packet is

 * limited (AF_PACKET in V2 more for example).

 *

 * \param Name of link

 * \param csum check if checksums are offloaded

 * \param other check if other things are offloaded: TSO, GRO, etc.

 * \retval -1 in case of error, 0 if none, 1 if some

 */

int GetIfaceOffloading(const char *dev, int csum, int other)

{

#if defined HAVE_LINUX_ETHTOOL_H && defined SIOCETHTOOL

    return GetIfaceOffloadingLinux(dev, csum, other);

#elif defined SIOCGIFCAP

    return GetIfaceOffloadingBSD(dev);

#elif defined OS_WIN32

    return GetIfaceOffloadingWin32(dev, csum, other);

#else

    return 0;

#endif

}

int DisableIfaceOffloading(LiveDevice *dev, int csum, int other)

{

    /* already set */

    if (dev->offload_orig != 0)

        return 0;

#if defined HAVE_LINUX_ETHTOOL_H && defined SIOCETHTOOL

    return DisableIfaceOffloadingLinux(dev, csum, other);

#elif defined SIOCSIFCAP

    return DisableIfaceOffloadingBSD(dev);

#elif defined OS_WIN32

    return DisableIfaceOffloadingWin32(dev, csum, other);

#else

    return 0;

#endif

}

void RestoreIfaceOffloading(LiveDevice *dev)

{

    if (dev->offload_orig != 0) {

#if defined HAVE_LINUX_ETHTOOL_H && defined SIOCETHTOOL

        RestoreIfaceOffloadingLinux(dev);

#elif defined SIOCSIFCAP

        RestoreIfaceOffloadingBSD(dev);

#elif defined OS_WIN32

        RestoreIfaceOffloadingWin32(dev);

#endif

    }

}

int GetIfaceRSSQueuesNum(const char *dev)

{

#if defined HAVE_LINUX_ETHTOOL_H && defined ETHTOOL_GRXRINGS

    struct ifreq ifr;

    struct ethtool_rxnfc nfccmd;

    int fd;

    (void)strlcpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));

    fd = socket(AF_INET, SOCK_DGRAM, 0);

    if (fd == -1) {

        SCLogWarning("%s: failed to open socket for ioctl: %s", dev, strerror(errno));

        return -1;

    }

    nfccmd.cmd = ETHTOOL_GRXRINGS;

    ifr.ifr_data = (void*) &nfccmd;

    if (ioctl(fd, SIOCETHTOOL, (char *)&ifr) < 0) {

        if (errno != ENOTSUP) {

            SCLogWarning("%s: failed get number of RSS queue ioctl: %s", dev, strerror(errno));

        }

        close(fd);

        return 0;

    }

    close(fd);

    SCLogInfo("%s: RX RSS queues: %d", dev, (int)nfccmd.data);

    return (int)nfccmd.data;

#else

    return 0;

#endif

}