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/* -*- linux-c -*-

 * INET         802.1Q VLAN

 *              Ethernet-type device handling.

 *

 * Authors:     Ben Greear <greearb@candelatech.com>

 *              Please send support related email to: vlan@scry.wanfear.com

 *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html

 *

 * Fixes:       Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>

 *                - reset skb->pkt_type on incoming packets when MAC was changed

 *                - see that changed MAC is saddr for outgoing packets

 *              Oct 20, 2001:  Ard van Breeman:

 *                - Fix MC-list, finally.

 *                - Flush MC-list on VLAN destroy.

 *

 *

 *              This program is free software; you can redistribute it and/or

 *              modify it under the terms of the GNU General Public License

 *              as published by the Free Software Foundation; either version

 *              2 of the License, or (at your option) any later version.

 */

#include <linux/module.h>

#include <linux/mm.h>

#include <linux/in.h>

#include <linux/init.h>

#include <asm/uaccess.h> /* for copy_from_user */

#include <linux/skbuff.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <net/datalink.h>

#include <net/p8022.h>

#include <net/arp.h>

#include "vlan.h"

#include "vlanproc.h"

#include <linux/if_vlan.h>

#include <net/ip.h>

/*

 *      Rebuild the Ethernet MAC header. This is called after an ARP

 *      (or in future other address resolution) has completed on this

 *      sk_buff. We now let ARP fill in the other fields.

 *

 *      This routine CANNOT use cached dst->neigh!

 *      Really, it is used only when dst->neigh is wrong.

 *

 * TODO:  This needs a checkup, I'm ignorant here. --BLG

 */

int vlan_dev_rebuild_header(struct sk_buff *skb)

{

        struct net_device *dev = skb->dev;

        struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);

        switch (veth->h_vlan_encapsulated_proto) {

#ifdef CONFIG_INET

        case __constant_htons(ETH_P_IP):

                /* TODO:  Confirm this will work with VLAN headers... */

                return arp_find(veth->h_dest, skb);

#endif

        default:

                printk(VLAN_DBG

                       "%s: unable to resolve type %X addresses.\n",

                       dev->name, ntohs(veth->h_vlan_encapsulated_proto));

                memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);

                break;

        }

        return 0;

}

static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)

{

        if (VLAN_DEV_INFO(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {

                if (skb_shared(skb) || skb_cloned(skb)) {

                        struct sk_buff *nskb = skb_copy(skb, GFP_ATOMIC);

                        kfree_skb(skb);

                        skb = nskb;

                }

                if (skb) {

                        /* Lifted from Gleb's VLAN code... */

                        memmove(skb->data - ETH_HLEN,

                                skb->data - VLAN_ETH_HLEN, 12);

                        skb->mac_header += VLAN_HLEN;

                }

        }

        return skb;

}

/*

 *      Determine the packet's protocol ID. The rule here is that we

 *      assume 802.3 if the type field is short enough to be a length.

 *      This is normal practice and works for any 'now in use' protocol.

 *

 *  Also, at this point we assume that we ARE dealing exclusively with

 *  VLAN packets, or packets that should be made into VLAN packets based

 *  on a default VLAN ID.

 *

 *  NOTE:  Should be similar to ethernet/eth.c.

 *

 *  SANITY NOTE:  This method is called when a packet is moving up the stack

 *                towards userland.  To get here, it would have already passed

 *                through the ethernet/eth.c eth_type_trans() method.

 *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be

 *                 stored UNALIGNED in the memory.  RISC systems don't like

 *                 such cases very much...

 *  SANITY NOTE 2a:  According to Dave Miller & Alexey, it will always be aligned,

 *                 so there doesn't need to be any of the unaligned stuff.  It has

 *                 been commented out now...  --Ben

 *

 */

int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,

                  struct packet_type* ptype, struct net_device *orig_dev)

{

        unsigned char *rawp = NULL;

        struct vlan_hdr *vhdr;

        unsigned short vid;

        struct net_device_stats *stats;

        unsigned short vlan_TCI;

        __be16 proto;

        if (dev->nd_net != &init_net) {

                kfree_skb(skb);

                return -1;

        }

        if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)

                return -1;

        if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) {

                kfree_skb(skb);

                return -1;

        }

        vhdr = (struct vlan_hdr *)(skb->data);

        /* vlan_TCI = ntohs(get_unaligned(&vhdr->h_vlan_TCI)); */

        vlan_TCI = ntohs(vhdr->h_vlan_TCI);

        vid = (vlan_TCI & VLAN_VID_MASK);

#ifdef VLAN_DEBUG

        printk(VLAN_DBG "%s: skb: %p vlan_id: %hx\n",

                __FUNCTION__, skb, vid);

#endif

        /* Ok, we will find the correct VLAN device, strip the header,

         * and then go on as usual.

         */

        /* We have 12 bits of vlan ID.

         *

         * We must not drop allow preempt until we hold a

         * reference to the device (netif_rx does that) or we

         * fail.

         */

        rcu_read_lock();

        skb->dev = __find_vlan_dev(dev, vid);

        if (!skb->dev) {

                rcu_read_unlock();

#ifdef VLAN_DEBUG

                printk(VLAN_DBG "%s: ERROR: No net_device for VID: %i on dev: %s [%i]\n",

                        __FUNCTION__, (unsigned int)(vid), dev->name, dev->ifindex);

#endif

                kfree_skb(skb);

                return -1;

        }

        skb->dev->last_rx = jiffies;

        /* Bump the rx counters for the VLAN device. */

        stats = vlan_dev_get_stats(skb->dev);

        stats->rx_packets++;

        stats->rx_bytes += skb->len;

        /* Take off the VLAN header (4 bytes currently) */

        skb_pull_rcsum(skb, VLAN_HLEN);

        /* Ok, lets check to make sure the device (dev) we

         * came in on is what this VLAN is attached to.

         */

        if (dev != VLAN_DEV_INFO(skb->dev)->real_dev) {

                rcu_read_unlock();

#ifdef VLAN_DEBUG

                printk(VLAN_DBG "%s: dropping skb: %p because came in on wrong device, dev: %s  real_dev: %s, skb_dev: %s\n",

                        __FUNCTION__, skb, dev->name,

                        VLAN_DEV_INFO(skb->dev)->real_dev->name,

                        skb->dev->name);

#endif

                kfree_skb(skb);

                stats->rx_errors++;

                return -1;

        }

        /*

         * Deal with ingress priority mapping.

         */

        skb->priority = vlan_get_ingress_priority(skb->dev, ntohs(vhdr->h_vlan_TCI));

#ifdef VLAN_DEBUG

        printk(VLAN_DBG "%s: priority: %lu  for TCI: %hu (hbo)\n",

                __FUNCTION__, (unsigned long)(skb->priority),

                ntohs(vhdr->h_vlan_TCI));

#endif

        /* The ethernet driver already did the pkt_type calculations

         * for us...

         */

        switch (skb->pkt_type) {

        case PACKET_BROADCAST: /* Yeah, stats collect these together.. */

                // stats->broadcast ++; // no such counter :-(

                break;

        case PACKET_MULTICAST:

                stats->multicast++;

                break;

        case PACKET_OTHERHOST:

                /* Our lower layer thinks this is not local, let's make sure.

                 * This allows the VLAN to have a different MAC than the underlying

                 * device, and still route correctly.

                 */

                if (!compare_ether_addr(eth_hdr(skb)->h_dest, skb->dev->dev_addr)) {

                        /* It is for our (changed) MAC-address! */

                        skb->pkt_type = PACKET_HOST;

                }

                break;

        default:

                break;

        }

        /*  Was a VLAN packet, grab the encapsulated protocol, which the layer

         * three protocols care about.

         */

        /* proto = get_unaligned(&vhdr->h_vlan_encapsulated_proto); */

        proto = vhdr->h_vlan_encapsulated_proto;

        skb->protocol = proto;

        if (ntohs(proto) >= 1536) {

                /* place it back on the queue to be handled by

                 * true layer 3 protocols.

                 */

                /* See if we are configured to re-write the VLAN header

                 * to make it look like ethernet...

                 */

                skb = vlan_check_reorder_header(skb);

                /* Can be null if skb-clone fails when re-ordering */

                if (skb) {

                        netif_rx(skb);

                } else {

                        /* TODO:  Add a more specific counter here. */

                        stats->rx_errors++;

                }

                rcu_read_unlock();

                return 0;

        }

        rawp = skb->data;

        /*

         * This is a magic hack to spot IPX packets. Older Novell breaks

         * the protocol design and runs IPX over 802.3 without an 802.2 LLC

         * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This

         * won't work for fault tolerant netware but does for the rest.

         */

        if (*(unsigned short *)rawp == 0xFFFF) {

                skb->protocol = htons(ETH_P_802_3);

                /* place it back on the queue to be handled by true layer 3 protocols.

                 */

                /* See if we are configured to re-write the VLAN header

                 * to make it look like ethernet...

                 */

                skb = vlan_check_reorder_header(skb);

                /* Can be null if skb-clone fails when re-ordering */

                if (skb) {

                        netif_rx(skb);

                } else {

                        /* TODO:  Add a more specific counter here. */

                        stats->rx_errors++;

                }

                rcu_read_unlock();

                return 0;

        }

        /*

         *      Real 802.2 LLC

         */

        skb->protocol = htons(ETH_P_802_2);

        /* place it back on the queue to be handled by upper layer protocols.

         */

        /* See if we are configured to re-write the VLAN header

         * to make it look like ethernet...

         */

        skb = vlan_check_reorder_header(skb);

        /* Can be null if skb-clone fails when re-ordering */

        if (skb) {

                netif_rx(skb);

        } else {

                /* TODO:  Add a more specific counter here. */

                stats->rx_errors++;

        }

        rcu_read_unlock();

        return 0;

}

static inline unsigned short vlan_dev_get_egress_qos_mask(struct net_device* dev,

                                                          struct sk_buff* skb)

{

        struct vlan_priority_tci_mapping *mp =

                VLAN_DEV_INFO(dev)->egress_priority_map[(skb->priority & 0xF)];

        while (mp) {

                if (mp->priority == skb->priority) {

                        return mp->vlan_qos; /* This should already be shifted to mask

                                              * correctly with the VLAN's TCI

                                              */

                }

                mp = mp->next;

        }

        return 0;

}

/*

 *      Create the VLAN header for an arbitrary protocol layer

 *

 *      saddr=NULL      means use device source address

 *      daddr=NULL      means leave destination address (eg unresolved arp)

 *

 *  This is called when the SKB is moving down the stack towards the

 *  physical devices.

 */

int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,

                         unsigned short type,

                         const void *daddr, const void *saddr, unsigned len)

{

        struct vlan_hdr *vhdr;

        unsigned short veth_TCI = 0;

        int rc = 0;

        int build_vlan_header = 0;

        struct net_device *vdev = dev; /* save this for the bottom of the method */

#ifdef VLAN_DEBUG

        printk(VLAN_DBG "%s: skb: %p type: %hx len: %x vlan_id: %hx, daddr: %p\n",

                __FUNCTION__, skb, type, len, VLAN_DEV_INFO(dev)->vlan_id, daddr);

#endif

        /* build vlan header only if re_order_header flag is NOT set.  This

         * fixes some programs that get confused when they see a VLAN device

         * sending a frame that is VLAN encoded (the consensus is that the VLAN

         * device should look completely like an Ethernet device when the

         * REORDER_HEADER flag is set)  The drawback to this is some extra

         * header shuffling in the hard_start_xmit.  Users can turn off this

         * REORDER behaviour with the vconfig tool.

         */

        if (!(VLAN_DEV_INFO(dev)->flags & VLAN_FLAG_REORDER_HDR))

                build_vlan_header = 1;

        if (build_vlan_header) {

                vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);

                /* build the four bytes that make this a VLAN header. */

                /* Now, construct the second two bytes. This field looks something

                 * like:

                 * usr_priority: 3 bits  (high bits)

                 * CFI           1 bit

                 * VLAN ID       12 bits (low bits)

                 *

                 */

                veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;

                veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);

                vhdr->h_vlan_TCI = htons(veth_TCI);

                /*

                 *  Set the protocol type.

                 *  For a packet of type ETH_P_802_3 we put the length in here instead.

                 *  It is up to the 802.2 layer to carry protocol information.

                 */

                if (type != ETH_P_802_3) {

                        vhdr->h_vlan_encapsulated_proto = htons(type);

                } else {

                        vhdr->h_vlan_encapsulated_proto = htons(len);

                }

                skb->protocol = htons(ETH_P_8021Q);

                skb_reset_network_header(skb);

        }

        /* Before delegating work to the lower layer, enter our MAC-address */

        if (saddr == NULL)

                saddr = dev->dev_addr;

        dev = VLAN_DEV_INFO(dev)->real_dev;

        /* MPLS can send us skbuffs w/out enough space.  This check will grow the

         * skb if it doesn't have enough headroom.  Not a beautiful solution, so

         * I'll tick a counter so that users can know it's happening...  If they

         * care...

         */

        /* NOTE:  This may still break if the underlying device is not the final

         * device (and thus there are more headers to add...)  It should work for

         * good-ole-ethernet though.

         */

        if (skb_headroom(skb) < dev->hard_header_len) {

                struct sk_buff *sk_tmp = skb;

                skb = skb_realloc_headroom(sk_tmp, dev->hard_header_len);

                kfree_skb(sk_tmp);

                if (skb == NULL) {

                        struct net_device_stats *stats = vlan_dev_get_stats(vdev);

                        stats->tx_dropped++;

                        return -ENOMEM;

                }

                VLAN_DEV_INFO(vdev)->cnt_inc_headroom_on_tx++;

#ifdef VLAN_DEBUG

                printk(VLAN_DBG "%s: %s: had to grow skb.\n", __FUNCTION__, vdev->name);

#endif

        }

        if (build_vlan_header) {

                /* Now make the underlying real hard header */

                rc = dev_hard_header(skb, dev, ETH_P_8021Q, daddr, saddr,

                                     len + VLAN_HLEN);

                if (rc > 0)

                        rc += VLAN_HLEN;

                else if (rc < 0)

                        rc -= VLAN_HLEN;

        } else

                /* If here, then we'll just make a normal looking ethernet frame,

                 * but, the hard_start_xmit method will insert the tag (it has to

                 * be able to do this for bridged and other skbs that don't come

                 * down the protocol stack in an orderly manner.

                 */

                rc = dev_hard_header(skb, dev, type, daddr, saddr, len);

        return rc;

}

int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)

{

        struct net_device_stats *stats = vlan_dev_get_stats(dev);

        struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);

        /* Handle non-VLAN frames if they are sent to us, for example by DHCP.

         *

         * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING

         * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...

         */

        if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||

                VLAN_DEV_INFO(dev)->flags & VLAN_FLAG_REORDER_HDR) {

                int orig_headroom = skb_headroom(skb);

                unsigned short veth_TCI;

                /* This is not a VLAN frame...but we can fix that! */

                VLAN_DEV_INFO(dev)->cnt_encap_on_xmit++;

#ifdef VLAN_DEBUG

                printk(VLAN_DBG "%s: proto to encap: 0x%hx (hbo)\n",

                        __FUNCTION__, htons(veth->h_vlan_proto));

#endif

                /* Construct the second two bytes. This field looks something

                 * like:

                 * usr_priority: 3 bits  (high bits)

                 * CFI           1 bit

                 * VLAN ID       12 bits (low bits)

                 */

                veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;

                veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);

                skb = __vlan_put_tag(skb, veth_TCI);

                if (!skb) {

                        stats->tx_dropped++;

                        return 0;

                }

                if (orig_headroom < VLAN_HLEN) {

                        VLAN_DEV_INFO(dev)->cnt_inc_headroom_on_tx++;

                }

        }

#ifdef VLAN_DEBUG

        printk(VLAN_DBG "%s: about to send skb: %p to dev: %s\n",

                __FUNCTION__, skb, skb->dev->name);

        printk(VLAN_DBG "  %2hx.%2hx.%2hx.%2xh.%2hx.%2hx %2hx.%2hx.%2hx.%2hx.%2hx.%2hx %4hx %4hx %4hx\n",

               veth->h_dest[0], veth->h_dest[1], veth->h_dest[2], veth->h_dest[3], veth->h_dest[4], veth->h_dest[5],

               veth->h_source[0], veth->h_source[1], veth->h_source[2], veth->h_source[3], veth->h_source[4], veth->h_source[5],

               veth->h_vlan_proto, veth->h_vlan_TCI, veth->h_vlan_encapsulated_proto);

#endif

        stats->tx_packets++; /* for statics only */

        stats->tx_bytes += skb->len;

        skb->dev = VLAN_DEV_INFO(dev)->real_dev;

        dev_queue_xmit(skb);

        return 0;

}

int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)

{

        struct net_device_stats *stats = vlan_dev_get_stats(dev);

        unsigned short veth_TCI;

        /* Construct the second two bytes. This field looks something

         * like:

         * usr_priority: 3 bits  (high bits)

         * CFI           1 bit

         * VLAN ID       12 bits (low bits)

         */

        veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;

        veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);

        skb = __vlan_hwaccel_put_tag(skb, veth_TCI);

        stats->tx_packets++;

        stats->tx_bytes += skb->len;

        skb->dev = VLAN_DEV_INFO(dev)->real_dev;

        dev_queue_xmit(skb);

        return 0;

}

int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)

{

        /* TODO: gotta make sure the underlying layer can handle it,

         * maybe an IFF_VLAN_CAPABLE flag for devices?

         */

        if (VLAN_DEV_INFO(dev)->real_dev->mtu < new_mtu)

                return -ERANGE;

        dev->mtu = new_mtu;

        return 0;

}

void vlan_dev_set_ingress_priority(const struct net_device *dev,

                                   u32 skb_prio, short vlan_prio)

{

        struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);

        if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)

                vlan->nr_ingress_mappings--;

        else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)

                vlan->nr_ingress_mappings++;

        vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;

}

int vlan_dev_set_egress_priority(const struct net_device *dev,

                                 u32 skb_prio, short vlan_prio)

{

        struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);

        struct vlan_priority_tci_mapping *mp = NULL;

        struct vlan_priority_tci_mapping *np;

        u32 vlan_qos = (vlan_prio << 13) & 0xE000;

        /* See if a priority mapping exists.. */

        mp = vlan->egress_priority_map[skb_prio & 0xF];

        while (mp) {

                if (mp->priority == skb_prio) {

                        if (mp->vlan_qos && !vlan_qos)

                                vlan->nr_egress_mappings--;

                        else if (!mp->vlan_qos && vlan_qos)

                                vlan->nr_egress_mappings++;

                        mp->vlan_qos = vlan_qos;

                        return 0;

                }

                mp = mp->next;

        }

        /* Create a new mapping then. */

        mp = vlan->egress_priority_map[skb_prio & 0xF];

        np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);

        if (!np)

                return -ENOBUFS;

        np->next = mp;

        np->priority = skb_prio;

        np->vlan_qos = vlan_qos;

        vlan->egress_priority_map[skb_prio & 0xF] = np;

        if (vlan_qos)

                vlan->nr_egress_mappings++;

        return 0;

}

/* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */

int vlan_dev_set_vlan_flag(const struct net_device *dev,

                           u32 flag, short flag_val)

{

        /* verify flag is supported */

        if (flag == VLAN_FLAG_REORDER_HDR) {

                if (flag_val) {

                        VLAN_DEV_INFO(dev)->flags |= VLAN_FLAG_REORDER_HDR;

                } else {

                        VLAN_DEV_INFO(dev)->flags &= ~VLAN_FLAG_REORDER_HDR;

                }

                return 0;

        }

        printk(KERN_ERR "%s: flag %i is not valid.\n", __FUNCTION__, flag);

        return -EINVAL;

}

void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)

{

        strncpy(result, VLAN_DEV_INFO(dev)->real_dev->name, 23);

}

void vlan_dev_get_vid(const struct net_device *dev, unsigned short *result)

{

        *result = VLAN_DEV_INFO(dev)->vlan_id;

}

int vlan_dev_open(struct net_device *dev)

{

        struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);

        struct net_device *real_dev = vlan->real_dev;

        int err;

        if (!(real_dev->flags & IFF_UP))

                return -ENETDOWN;

        if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {

                err = dev_unicast_add(real_dev, dev->dev_addr, ETH_ALEN);

                if (err < 0)

                        return err;

        }

        memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);

        if (dev->flags & IFF_ALLMULTI)

                dev_set_allmulti(real_dev, 1);

        if (dev->flags & IFF_PROMISC)

                dev_set_promiscuity(real_dev, 1);

        return 0;

}

int vlan_dev_stop(struct net_device *dev)

{

        struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;

        dev_mc_unsync(real_dev, dev);

        if (dev->flags & IFF_ALLMULTI)

                dev_set_allmulti(real_dev, -1);

        if (dev->flags & IFF_PROMISC)

                dev_set_promiscuity(real_dev, -1);

        if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))

                dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);

        return 0;

}

int vlan_set_mac_address(struct net_device *dev, void *p)

{

        struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;

        struct sockaddr *addr = p;

        int err;

        if (!is_valid_ether_addr(addr->sa_data))

                return -EADDRNOTAVAIL;

        if (!(dev->flags & IFF_UP))

                goto out;

        if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {

                err = dev_unicast_add(real_dev, addr->sa_data, ETH_ALEN);

                if (err < 0)

                        return err;

        }

        if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))

                dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);

out:

        memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);

        return 0;

}

int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)

{

        struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;

        struct ifreq ifrr;