1 files changed, 774 insertions, 0 deletions

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
new file mode 100644
index 000000000000..1f6d31670bc7
--- /dev/null
+++ b/net/8021q/vlan.c
@@ -0,0 +1,774 @@
+/*
+ * 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:
+ *              Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
+ *              Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
+ *              Correct all the locking - David S. Miller <davem@redhat.com>;
+ *              Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
+ *
+ *              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 <asm/uaccess.h> /* for copy_from_user */
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/datalink.h>
+#include <linux/mm.h>
+#include <linux/in.h>
+#include <linux/init.h>
+#include <net/p8022.h>
+#include <net/arp.h>
+#include <linux/rtnetlink.h>
+#include <linux/notifier.h>
+
+#include <linux/if_vlan.h>
+#include "vlan.h"
+#include "vlanproc.h"
+
+#define DRV_VERSION "1.8"
+
+/* Global VLAN variables */
+
+/* Our listing of VLAN group(s) */
+static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
+#define vlan_grp_hashfn(IDX)    ((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK)
+
+static char vlan_fullname[] = "802.1Q VLAN Support";
+static char vlan_version[] = DRV_VERSION;
+static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
+static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
+
+static int vlan_device_event(struct notifier_block *, unsigned long, void *);
+static int vlan_ioctl_handler(void __user *);
+static int unregister_vlan_dev(struct net_device *, unsigned short );
+
+static struct notifier_block vlan_notifier_block = {
+        .notifier_call = vlan_device_event,
+};
+
+/* These may be changed at run-time through IOCTLs */
+
+/* Determines interface naming scheme. */
+unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
+
+static struct packet_type vlan_packet_type = {
+        .type = __constant_htons(ETH_P_8021Q),
+        .func = vlan_skb_recv, /* VLAN receive method */
+};
+
+/* Bits of netdev state that are propagated from real device to virtual */
+#define VLAN_LINK_STATE_MASK \
+        ((1<<__LINK_STATE_PRESENT)|(1<<__LINK_STATE_NOCARRIER))
+
+/* End of global variables definitions. */
+
+/*
+ * Function vlan_proto_init (pro)
+ *
+ *    Initialize VLAN protocol layer, 
+ *
+ */
+static int __init vlan_proto_init(void)
+{
+        int err;
+
+        printk(VLAN_INF "%s v%s %s\n",
+               vlan_fullname, vlan_version, vlan_copyright);
+        printk(VLAN_INF "All bugs added by %s\n",
+               vlan_buggyright);
+
+        /* proc file system initialization */
+        err = vlan_proc_init();
+        if (err < 0) {
+                printk(KERN_ERR 
+                       "%s %s: can't create entry in proc filesystem!\n",
+                       __FUNCTION__, VLAN_NAME);
+                return err;
+        }
+
+        dev_add_pack(&vlan_packet_type);
+
+        /* Register us to receive netdevice events */
+        err = register_netdevice_notifier(&vlan_notifier_block);
+        if (err < 0) {
+                dev_remove_pack(&vlan_packet_type);
+                vlan_proc_cleanup();
+                return err;
+        }
+
+        vlan_ioctl_set(vlan_ioctl_handler);
+
+        return 0;
+}
+
+/* Cleanup all vlan devices 
+ * Note: devices that have been registered that but not
+ * brought up will exist but have no module ref count.
+ */
+static void __exit vlan_cleanup_devices(void)
+{
+        struct net_device *dev, *nxt;
+
+        rtnl_lock();
+        for (dev = dev_base; dev; dev = nxt) {
+                nxt = dev->next;
+                if (dev->priv_flags & IFF_802_1Q_VLAN) {
+                        unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
+                                            VLAN_DEV_INFO(dev)->vlan_id);
+
+                        unregister_netdevice(dev);
+                }
+        }
+        rtnl_unlock();
+}
+
+/*
+ *     Module 'remove' entry point.
+ *     o delete /proc/net/router directory and static entries.
+ */ 
+static void __exit vlan_cleanup_module(void)
+{
+        int i;
+
+        vlan_ioctl_set(NULL);
+
+        /* Un-register us from receiving netdevice events */
+        unregister_netdevice_notifier(&vlan_notifier_block);
+
+        dev_remove_pack(&vlan_packet_type);
+        vlan_cleanup_devices();
+
+        /* This table must be empty if there are no module
+         * references left.
+         */
+        for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
+                BUG_ON(!hlist_empty(&vlan_group_hash[i]));
+        }
+        vlan_proc_cleanup();
+
+        synchronize_net();
+}
+
+module_init(vlan_proto_init);
+module_exit(vlan_cleanup_module);
+
+/* Must be invoked with RCU read lock (no preempt) */
+static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
+{
+        struct vlan_group *grp;
+        struct hlist_node *n;
+        int hash = vlan_grp_hashfn(real_dev_ifindex);
+
+        hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
+                if (grp->real_dev_ifindex == real_dev_ifindex)
+                        return grp;
+        }
+
+        return NULL;
+}
+
+/*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
+ *
+ * Must be invoked with RCU read lock (no preempt)
+ */
+struct net_device *__find_vlan_dev(struct net_device *real_dev,
+                                   unsigned short VID)
+{
+        struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
+
+        if (grp)
+                return grp->vlan_devices[VID];
+
+        return NULL;
+}
+
+static void vlan_rcu_free(struct rcu_head *rcu)
+{
+        kfree(container_of(rcu, struct vlan_group, rcu));
+}
+
+
+/* This returns 0 if everything went fine.
+ * It will return 1 if the group was killed as a result.
+ * A negative return indicates failure.
+ *
+ * The RTNL lock must be held.
+ */
+static int unregister_vlan_dev(struct net_device *real_dev,
+                               unsigned short vlan_id)
+{
+        struct net_device *dev = NULL;
+        int real_dev_ifindex = real_dev->ifindex;
+        struct vlan_group *grp;
+        int i, ret;
+
+#ifdef VLAN_DEBUG
+        printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
+#endif
+
+        /* sanity check */
+        if (vlan_id >= VLAN_VID_MASK)
+                return -EINVAL;
+
+        ASSERT_RTNL();
+        grp = __vlan_find_group(real_dev_ifindex);
+
+        ret = 0;
+
+        if (grp) {
+                dev = grp->vlan_devices[vlan_id];
+                if (dev) {
+                        /* Remove proc entry */
+                        vlan_proc_rem_dev(dev);
+
+                        /* Take it out of our own structures, but be sure to
+                         * interlock with HW accelerating devices or SW vlan
+                         * input packet processing.
+                         */
+                        if (real_dev->features &
+                            (NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_FILTER)) {
+                                real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
+                        }
+
+                        grp->vlan_devices[vlan_id] = NULL;
+                        synchronize_net();
+
+
+                        /* Caller unregisters (and if necessary, puts)
+                         * VLAN device, but we get rid of the reference to
+                         * real_dev here.
+                         */
+                        dev_put(real_dev);
+
+                        /* If the group is now empty, kill off the
+                         * group.
+                         */
+                        for (i = 0; i < VLAN_VID_MASK; i++)
+                                if (grp->vlan_devices[i])
+                                        break;
+
+                        if (i == VLAN_VID_MASK) {
+                                if (real_dev->features & NETIF_F_HW_VLAN_RX)
+                                        real_dev->vlan_rx_register(real_dev, NULL);
+
+                                hlist_del_rcu(&grp->hlist);
+
+                                /* Free the group, after all cpu's are done. */
+                                call_rcu(&grp->rcu, vlan_rcu_free);
+
+                                grp = NULL;
+                                ret = 1;
+                        }
+                }
+        }
+
+        return ret;
+}
+
+static int unregister_vlan_device(const char *vlan_IF_name)
+{
+        struct net_device *dev = NULL;
+        int ret;
+
+
+        dev = dev_get_by_name(vlan_IF_name);
+        ret = -EINVAL;
+        if (dev) {
+                if (dev->priv_flags & IFF_802_1Q_VLAN) {
+                        rtnl_lock();
+
+                        ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
+                                                  VLAN_DEV_INFO(dev)->vlan_id);
+
+                        dev_put(dev);
+                        unregister_netdevice(dev);
+
+                        rtnl_unlock();
+
+                        if (ret == 1)
+                                ret = 0;
+                } else {
+                        printk(VLAN_ERR 
+                               "%s: ERROR:      Tried to remove a non-vlan device "
+                               "with VLAN code, name: %s  priv_flags: %hX\n",
+                               __FUNCTION__, dev->name, dev->priv_flags);
+                        dev_put(dev);
+                        ret = -EPERM;
+                }
+        } else {
+#ifdef VLAN_DEBUG
+                printk(VLAN_DBG "%s: WARNING: Could not find dev.\n", __FUNCTION__);
+#endif
+                ret = -EINVAL;
+        }
+
+        return ret;
+}
+
+static void vlan_setup(struct net_device *new_dev)
+{
+        SET_MODULE_OWNER(new_dev);
+            
+        /* new_dev->ifindex = 0;  it will be set when added to
+         * the global list.
+         * iflink is set as well.
+         */
+        new_dev->get_stats = vlan_dev_get_stats;
+
+        /* Make this thing known as a VLAN device */
+        new_dev->priv_flags |= IFF_802_1Q_VLAN;
+                                
+        /* Set us up to have no queue, as the underlying Hardware device
+         * can do all the queueing we could want.
+         */
+        new_dev->tx_queue_len = 0;
+
+        /* set up method calls */
+        new_dev->change_mtu = vlan_dev_change_mtu;
+        new_dev->open = vlan_dev_open;
+        new_dev->stop = vlan_dev_stop;
+        new_dev->set_mac_address = vlan_dev_set_mac_address;
+        new_dev->set_multicast_list = vlan_dev_set_multicast_list;
+        new_dev->destructor = free_netdev;
+        new_dev->do_ioctl = vlan_dev_ioctl;
+}
+
+/*  Attach a VLAN device to a mac address (ie Ethernet Card).
+ *  Returns the device that was created, or NULL if there was
+ *  an error of some kind.
+ */
+static struct net_device *register_vlan_device(const char *eth_IF_name,
+                                               unsigned short VLAN_ID)
+{
+        struct vlan_group *grp;
+        struct net_device *new_dev;
+        struct net_device *real_dev; /* the ethernet device */
+        char name[IFNAMSIZ];
+
+#ifdef VLAN_DEBUG
+        printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
+                __FUNCTION__, eth_IF_name, VLAN_ID);
+#endif
+
+        if (VLAN_ID >= VLAN_VID_MASK)
+                goto out_ret_null;
+
+        /* find the device relating to eth_IF_name. */
+        real_dev = dev_get_by_name(eth_IF_name);
+        if (!real_dev)
+                goto out_ret_null;
+
+        if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
+                printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
+                        __FUNCTION__, real_dev->name);
+                goto out_put_dev;
+        }
+
+        if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
+            (real_dev->vlan_rx_register == NULL ||
+             real_dev->vlan_rx_kill_vid == NULL)) {
+                printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
+                        __FUNCTION__, real_dev->name);
+                goto out_put_dev;
+        }
+
+        if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
+            (real_dev->vlan_rx_add_vid == NULL ||
+             real_dev->vlan_rx_kill_vid == NULL)) {
+                printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
+                        __FUNCTION__, real_dev->name);
+                goto out_put_dev;
+        }
+
+        /* From this point on, all the data structures must remain
+         * consistent.
+         */
+        rtnl_lock();
+
+        /* The real device must be up and operating in order to
+         * assosciate a VLAN device with it.
+         */
+        if (!(real_dev->flags & IFF_UP))
+                goto out_unlock;
+
+        if (__find_vlan_dev(real_dev, VLAN_ID) != NULL) {
+                /* was already registered. */
+                printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
+                goto out_unlock;
+        }
+
+        /* Gotta set up the fields for the device. */
+#ifdef VLAN_DEBUG
+        printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
+               vlan_name_type);
+#endif
+        switch (vlan_name_type) {
+        case VLAN_NAME_TYPE_RAW_PLUS_VID:
+                /* name will look like:  eth1.0005 */
+                snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
+                break;
+        case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
+                /* Put our vlan.VID in the name.
+                 * Name will look like:  vlan5
+                 */
+                snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
+                break;
+        case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
+                /* Put our vlan.VID in the name.
+                 * Name will look like:  eth0.5
+                 */
+                snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
+                break;
+        case VLAN_NAME_TYPE_PLUS_VID:
+                /* Put our vlan.VID in the name.
+                 * Name will look like:  vlan0005
+                 */
+        default:
+                snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
+        };
+                    
+        new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
+                               vlan_setup);
+        if (new_dev == NULL)
+                goto out_unlock;
+
+#ifdef VLAN_DEBUG
+        printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
+#endif
+        /* IFF_BROADCAST|IFF_MULTICAST; ??? */
+        new_dev->flags = real_dev->flags;
+        new_dev->flags &= ~IFF_UP;
+
+        new_dev->state = real_dev->state & VLAN_LINK_STATE_MASK;
+
+        /* need 4 bytes for extra VLAN header info,
+         * hope the underlying device can handle it.
+         */
+        new_dev->mtu = real_dev->mtu;
+
+        /* TODO: maybe just assign it to be ETHERNET? */
+        new_dev->type = real_dev->type;
+
+        new_dev->hard_header_len = real_dev->hard_header_len;
+        if (!(real_dev->features & NETIF_F_HW_VLAN_TX)) {
+                /* Regular ethernet + 4 bytes (18 total). */
+                new_dev->hard_header_len += VLAN_HLEN;
+        }
+
+        VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
+                     new_dev->priv,
+                     sizeof(struct vlan_dev_info));
+            
+        memcpy(new_dev->broadcast, real_dev->broadcast, real_dev->addr_len);
+        memcpy(new_dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
+        new_dev->addr_len = real_dev->addr_len;
+
+        if (real_dev->features & NETIF_F_HW_VLAN_TX) {
+                new_dev->hard_header = real_dev->hard_header;
+                new_dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
+                new_dev->rebuild_header = real_dev->rebuild_header;
+        } else {
+                new_dev->hard_header = vlan_dev_hard_header;
+                new_dev->hard_start_xmit = vlan_dev_hard_start_xmit;
+                new_dev->rebuild_header = vlan_dev_rebuild_header;
+        }
+        new_dev->hard_header_parse = real_dev->hard_header_parse;
+
+        VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
+        VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
+        VLAN_DEV_INFO(new_dev)->dent = NULL;
+        VLAN_DEV_INFO(new_dev)->flags = 1;
+
+#ifdef VLAN_DEBUG
+        printk(VLAN_DBG "About to go find the group for idx: %i\n",
+               real_dev->ifindex);
+#endif
+            
+        if (register_netdevice(new_dev))
+                goto out_free_newdev;
+
+        /* So, got the sucker initialized, now lets place
+         * it into our local structure.
+         */
+        grp = __vlan_find_group(real_dev->ifindex);
+
+        /* Note, we are running under the RTNL semaphore
+         * so it cannot "appear" on us.
+         */
+        if (!grp) { /* need to add a new group */
+                grp = kmalloc(sizeof(struct vlan_group), GFP_KERNEL);
+                if (!grp)
+                        goto out_free_unregister;
+                                        
+                /* printk(KERN_ALERT "VLAN REGISTER:  Allocated new group.\n"); */
+                memset(grp, 0, sizeof(struct vlan_group));
+                grp->real_dev_ifindex = real_dev->ifindex;
+
+                hlist_add_head_rcu(&grp->hlist, 
+                                   &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
+
+                if (real_dev->features & NETIF_F_HW_VLAN_RX)
+                        real_dev->vlan_rx_register(real_dev, grp);
+        }
+            
+        grp->vlan_devices[VLAN_ID] = new_dev;
+
+        if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
+                printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
+                                                         new_dev->name);
+
+        if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
+                real_dev->vlan_rx_add_vid(real_dev, VLAN_ID);
+
+        rtnl_unlock();
+
+
+#ifdef VLAN_DEBUG
+        printk(VLAN_DBG "Allocated new device successfully, returning.\n");
+#endif
+        return new_dev;
+
+out_free_unregister:
+        unregister_netdev(new_dev);
+        goto out_unlock;
+
+out_free_newdev:
+        free_netdev(new_dev);
+
+out_unlock:
+        rtnl_unlock();
+
+out_put_dev:
+        dev_put(real_dev);
+
+out_ret_null:
+        return NULL;
+}
+
+static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
+{
+        struct net_device *dev = ptr;
+        struct vlan_group *grp = __vlan_find_group(dev->ifindex);
+        int i, flgs;
+        struct net_device *vlandev;
+
+        if (!grp)
+                goto out;
+
+        /* It is OK that we do not hold the group lock right now,
+         * as we run under the RTNL lock.
+         */
+
+        switch (event) {
+        case NETDEV_CHANGE:
+                /* Propagate real device state to vlan devices */
+                flgs = dev->state & VLAN_LINK_STATE_MASK;
+                for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
+                        vlandev = grp->vlan_devices[i];
+                        if (!vlandev)
+                                continue;
+
+                        if ((vlandev->state & VLAN_LINK_STATE_MASK) != flgs) {
+                                vlandev->state = (vlandev->state &~ VLAN_LINK_STATE_MASK) 
+                                        | flgs;
+                                netdev_state_change(vlandev);
+                        }
+                }
+                break;
+
+        case NETDEV_DOWN:
+                /* Put all VLANs for this dev in the down state too.  */
+                for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
+                        vlandev = grp->vlan_devices[i];
+                        if (!vlandev)
+                                continue;
+
+                        flgs = vlandev->flags;
+                        if (!(flgs & IFF_UP))
+                                continue;
+
+                        dev_change_flags(vlandev, flgs & ~IFF_UP);
+                }
+                break;
+
+        case NETDEV_UP:
+                /* Put all VLANs for this dev in the up state too.  */
+                for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
+                        vlandev = grp->vlan_devices[i];
+                        if (!vlandev)
+                                continue;
+                                
+                        flgs = vlandev->flags;
+                        if (flgs & IFF_UP)
+                                continue;
+
+                        dev_change_flags(vlandev, flgs | IFF_UP);
+                }
+                break;
+                
+        case NETDEV_UNREGISTER:
+                /* Delete all VLANs for this dev. */
+                for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
+                        int ret;
+
+                        vlandev = grp->vlan_devices[i];
+                        if (!vlandev)
+                                continue;
+
+                        ret = unregister_vlan_dev(dev,
+                                                  VLAN_DEV_INFO(vlandev)->vlan_id);
+
+                        unregister_netdevice(vlandev);
+
+                        /* Group was destroyed? */
+                        if (ret == 1)
+                                break;
+                }
+                break;
+        };
+
+out:
+        return NOTIFY_DONE;
+}
+
+/*
+ *      VLAN IOCTL handler.
+ *      o execute requested action or pass command to the device driver
+ *   arg is really a struct vlan_ioctl_args __user *.
+ */
+static int vlan_ioctl_handler(void __user *arg)
+{
+        int err = 0;
+        unsigned short vid = 0;
+        struct vlan_ioctl_args args;
+
+        if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
+                return -EFAULT;
+
+        /* Null terminate this sucker, just in case. */
+        args.device1[23] = 0;
+        args.u.device2[23] = 0;
+
+#ifdef VLAN_DEBUG
+        printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
+#endif
+
+        switch (args.cmd) {
+        case SET_VLAN_INGRESS_PRIORITY_CMD:
+                if (!capable(CAP_NET_ADMIN))
+                        return -EPERM;
+                err = vlan_dev_set_ingress_priority(args.device1,
+                                                    args.u.skb_priority,
+                                                    args.vlan_qos);
+                break;
+
+        case SET_VLAN_EGRESS_PRIORITY_CMD:
+                if (!capable(CAP_NET_ADMIN))
+                        return -EPERM;
+                err = vlan_dev_set_egress_priority(args.device1,
+                                                   args.u.skb_priority,
+                                                   args.vlan_qos);
+                break;
+
+        case SET_VLAN_FLAG_CMD:
+                if (!capable(CAP_NET_ADMIN))
+                        return -EPERM;
+                err = vlan_dev_set_vlan_flag(args.device1,
+                                             args.u.flag,
+                                             args.vlan_qos);
+                break;
+
+        case SET_VLAN_NAME_TYPE_CMD:
+                if (!capable(CAP_NET_ADMIN))
+                        return -EPERM;
+                if ((args.u.name_type >= 0) &&
+                    (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
+                        vlan_name_type = args.u.name_type;
+                        err = 0;
+                } else {
+                        err = -EINVAL;
+                }
+                break;
+
+        case ADD_VLAN_CMD:
+                if (!capable(CAP_NET_ADMIN))
+                        return -EPERM;
+                /* we have been given the name of the Ethernet Device we want to
+                 * talk to:  args.dev1   We also have the
+                 * VLAN ID:  args.u.VID
+                 */
+                if (register_vlan_device(args.device1, args.u.VID)) {
+                        err = 0;
+                } else {
+                        err = -EINVAL;
+                }
+                break;
+
+        case DEL_VLAN_CMD:
+                if (!capable(CAP_NET_ADMIN))
+                        return -EPERM;
+                /* Here, the args.dev1 is the actual VLAN we want
+                 * to get rid of.
+                 */
+                err = unregister_vlan_device(args.device1);
+                break;
+
+        case GET_VLAN_INGRESS_PRIORITY_CMD:
+                /* TODO:  Implement
+                   err = vlan_dev_get_ingress_priority(args);
+                   if (copy_to_user((void*)arg, &args,
+                        sizeof(struct vlan_ioctl_args))) {
+                        err = -EFAULT;
+                   }
+                */
+                err = -EINVAL;
+                break;
+        case GET_VLAN_EGRESS_PRIORITY_CMD:
+                /* TODO:  Implement
+                   err = vlan_dev_get_egress_priority(args.device1, &(args.args);
+                   if (copy_to_user((void*)arg, &args,
+                        sizeof(struct vlan_ioctl_args))) {
+                        err = -EFAULT;
+                   }
+                */
+                err = -EINVAL;
+                break;
+        case GET_VLAN_REALDEV_NAME_CMD:
+                err = vlan_dev_get_realdev_name(args.device1, args.u.device2);
+                if (copy_to_user(arg, &args,
+                                 sizeof(struct vlan_ioctl_args))) {
+                        err = -EFAULT;
+                }
+                break;
+
+        case GET_VLAN_VID_CMD:
+                err = vlan_dev_get_vid(args.device1, &vid);
+                args.u.VID = vid;
+                if (copy_to_user(arg, &args,
+                                 sizeof(struct vlan_ioctl_args))) {
+                      err = -EFAULT;
+                }
+                break;
+
+        default:
+                /* pass on to underlying device instead?? */
+                printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
+                        __FUNCTION__, args.cmd);
+                return -EINVAL;
+        };
+
+        return err;
+}
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);