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linux-sg2042/net/8021q/vlan.c

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/*
* 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/capability.h>
#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 */
};
/* 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)
goto err1;
err = vlan_netlink_init();
if (err < 0)
goto err2;
vlan_ioctl_set(vlan_ioctl_handler);
return 0;
err2:
unregister_netdevice_notifier(&vlan_notifier_block);
err1:
vlan_proc_cleanup();
dev_remove_pack(&vlan_packet_type);
return err;
}
/*
* Module 'remove' entry point.
* o delete /proc/net/router directory and static entries.
*/
static void __exit vlan_cleanup_module(void)
{
int i;
vlan_netlink_fini();
vlan_ioctl_set(NULL);
/* Un-register us from receiving netdevice events */
unregister_netdevice_notifier(&vlan_notifier_block);
dev_remove_pack(&vlan_packet_type);
/* 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 vlan_group_get_device(grp, VID);
return NULL;
}
static void vlan_group_free(struct vlan_group *grp)
{
int i;
for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
kfree(grp->vlan_devices_arrays[i]);
kfree(grp);
}
static struct vlan_group *vlan_group_alloc(int ifindex)
{
struct vlan_group *grp;
unsigned int size;
unsigned int i;
grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
if (!grp)
return NULL;
size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
grp->vlan_devices_arrays[i] = kzalloc(size, GFP_KERNEL);
if (!grp->vlan_devices_arrays[i])
goto err;
}
grp->real_dev_ifindex = ifindex;
hlist_add_head_rcu(&grp->hlist,
&vlan_group_hash[vlan_grp_hashfn(ifindex)]);
return grp;
err:
vlan_group_free(grp);
return NULL;
}
static void vlan_rcu_free(struct rcu_head *rcu)
{
vlan_group_free(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 = vlan_group_get_device(grp, 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_FILTER)
real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
vlan_group_set_device(grp, 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 (vlan_group_get_device(grp, 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;
}
int unregister_vlan_device(struct net_device *dev)
{
int ret;
ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
VLAN_DEV_INFO(dev)->vlan_id);
unregister_netdevice(dev);
if (ret == 1)
ret = 0;
return ret;
}
/*
* vlan network devices have devices nesting below it, and are a special
* "super class" of normal network devices; split their locks off into a
* separate class since they always nest.
*/
static struct lock_class_key vlan_netdev_xmit_lock_key;
static int vlan_dev_init(struct net_device *dev)
{
struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;
/* IFF_BROADCAST|IFF_MULTICAST; ??? */
dev->flags = real_dev->flags & ~IFF_UP;
dev->iflink = real_dev->ifindex;
dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
(1<<__LINK_STATE_DORMANT))) |
(1<<__LINK_STATE_PRESENT);
if (is_zero_ether_addr(dev->dev_addr))
memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
if (is_zero_ether_addr(dev->broadcast))
memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
if (real_dev->features & NETIF_F_HW_VLAN_TX) {
dev->hard_header = real_dev->hard_header;
dev->hard_header_len = real_dev->hard_header_len;
dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
dev->rebuild_header = real_dev->rebuild_header;
} else {
dev->hard_header = vlan_dev_hard_header;
dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
dev->hard_start_xmit = vlan_dev_hard_start_xmit;
dev->rebuild_header = vlan_dev_rebuild_header;
}
dev->hard_header_parse = real_dev->hard_header_parse;
dev->hard_header_cache = NULL;
lockdep_set_class(&dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
return 0;
}
void vlan_setup(struct net_device *new_dev)
{
SET_MODULE_OWNER(new_dev);
ether_setup(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->init = vlan_dev_init;
new_dev->open = vlan_dev_open;
new_dev->stop = vlan_dev_stop;
new_dev->set_multicast_list = vlan_dev_set_multicast_list;
new_dev->change_rx_flags = vlan_change_rx_flags;
new_dev->destructor = free_netdev;
new_dev->do_ioctl = vlan_dev_ioctl;
memset(new_dev->broadcast, 0, ETH_ALEN);
}
static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
{
/* Have to respect userspace enforced dormant state
* of real device, also must allow supplicant running
* on VLAN device
*/
if (dev->operstate == IF_OPER_DORMANT)
netif_dormant_on(vlandev);
else
netif_dormant_off(vlandev);
if (netif_carrier_ok(dev)) {
if (!netif_carrier_ok(vlandev))
netif_carrier_on(vlandev);
} else {
if (netif_carrier_ok(vlandev))
netif_carrier_off(vlandev);
}
}
int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
{
if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
__FUNCTION__, real_dev->name);
return -EOPNOTSUPP;
}
if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
!real_dev->vlan_rx_register) {
printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
__FUNCTION__, real_dev->name);
return -EOPNOTSUPP;
}
if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
(!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
__FUNCTION__, real_dev->name);
return -EOPNOTSUPP;
}
/* The real device must be up and operating in order to
* assosciate a VLAN device with it.
*/
if (!(real_dev->flags & IFF_UP))
return -ENETDOWN;
if (__find_vlan_dev(real_dev, vlan_id) != NULL) {
/* was already registered. */
printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
return -EEXIST;
}
return 0;
}
int register_vlan_dev(struct net_device *dev)
{
struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
struct net_device *real_dev = vlan->real_dev;
unsigned short vlan_id = vlan->vlan_id;
struct vlan_group *grp, *ngrp = NULL;
int err;
grp = __vlan_find_group(real_dev->ifindex);
if (!grp) {
ngrp = grp = vlan_group_alloc(real_dev->ifindex);
if (!grp)
return -ENOBUFS;
}
err = register_netdevice(dev);
if (err < 0)
goto out_free_group;
/* Account for reference in struct vlan_dev_info */
dev_hold(real_dev);
vlan_transfer_operstate(real_dev, dev);
linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
/* So, got the sucker initialized, now lets place
* it into our local structure.
*/
vlan_group_set_device(grp, vlan_id, dev);
if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
real_dev->vlan_rx_register(real_dev, ngrp);
if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
real_dev->vlan_rx_add_vid(real_dev, vlan_id);
if (vlan_proc_add_dev(dev) < 0)
printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
dev->name);
return 0;
out_free_group:
if (ngrp)
vlan_group_free(ngrp);
return err;
}
/* Attach a VLAN device to a mac address (ie Ethernet Card).
* Returns 0 if the device was created or a negative error code otherwise.
*/
static int register_vlan_device(struct net_device *real_dev,
unsigned short VLAN_ID)
{
struct net_device *new_dev;
char name[IFNAMSIZ];
int err;
#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)
return -ERANGE;
err = vlan_check_real_dev(real_dev, VLAN_ID);
if (err < 0)
return err;
/* 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)
return -ENOBUFS;
/* need 4 bytes for extra VLAN header info,
* hope the underlying device can handle it.
*/
new_dev->mtu = real_dev->mtu;
#ifdef VLAN_DEBUG
printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
VLAN_MEM_DBG("new_dev->priv malloc, addr: %p size: %i\n",
new_dev->priv,
sizeof(struct vlan_dev_info));
#endif
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 = VLAN_FLAG_REORDER_HDR;
new_dev->rtnl_link_ops = &vlan_link_ops;
err = register_vlan_dev(new_dev);
if (err < 0)
goto out_free_newdev;
/* Account for reference in struct vlan_dev_info */
dev_hold(real_dev);
#ifdef VLAN_DEBUG
printk(VLAN_DBG "Allocated new device successfully, returning.\n");
#endif
return 0;
out_free_newdev:
free_netdev(new_dev);
return err;
}
static void vlan_sync_address(struct net_device *dev,
struct net_device *vlandev)
{
struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev);
/* May be called without an actual change */
if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
return;
/* vlan address was different from the old address and is equal to
* the new address */
if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
!compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
/* vlan address was equal to the old address and is different from
* the new address */
if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
}
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 */
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = vlan_group_get_device(grp, i);
if (!vlandev)
continue;
vlan_transfer_operstate(dev, vlandev);
}
break;
case NETDEV_CHANGEADDR:
/* Adjust unicast filters on underlying device */
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = vlan_group_get_device(grp, i);
if (!vlandev)
continue;
vlan_sync_address(dev, 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 = vlan_group_get_device(grp, 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 = vlan_group_get_device(grp, 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 = vlan_group_get_device(grp, 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;
unsigned short vid = 0;
struct vlan_ioctl_args args;
struct net_device *dev = NULL;
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
rtnl_lock();
switch (args.cmd) {
case SET_VLAN_INGRESS_PRIORITY_CMD:
case SET_VLAN_EGRESS_PRIORITY_CMD:
case SET_VLAN_FLAG_CMD:
case ADD_VLAN_CMD:
case DEL_VLAN_CMD:
case GET_VLAN_REALDEV_NAME_CMD:
case GET_VLAN_VID_CMD:
err = -ENODEV;
dev = __dev_get_by_name(args.device1);
if (!dev)
goto out;
err = -EINVAL;
if (args.cmd != ADD_VLAN_CMD &&
!(dev->priv_flags & IFF_802_1Q_VLAN))
goto out;
}
switch (args.cmd) {
case SET_VLAN_INGRESS_PRIORITY_CMD:
err = -EPERM;
if (!capable(CAP_NET_ADMIN))
break;
vlan_dev_set_ingress_priority(dev,
args.u.skb_priority,
args.vlan_qos);
break;
case SET_VLAN_EGRESS_PRIORITY_CMD:
err = -EPERM;
if (!capable(CAP_NET_ADMIN))
break;
err = vlan_dev_set_egress_priority(dev,
args.u.skb_priority,
args.vlan_qos);
break;
case SET_VLAN_FLAG_CMD:
err = -EPERM;
if (!capable(CAP_NET_ADMIN))
break;
err = vlan_dev_set_vlan_flag(dev,
args.u.flag,
args.vlan_qos);
break;
case SET_VLAN_NAME_TYPE_CMD:
err = -EPERM;
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:
err = -EPERM;
if (!capable(CAP_NET_ADMIN))
break;
err = register_vlan_device(dev, args.u.VID);
break;
case DEL_VLAN_CMD:
err = -EPERM;
if (!capable(CAP_NET_ADMIN))
break;
err = unregister_vlan_device(dev);
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 = 0;
vlan_dev_get_realdev_name(dev, args.u.device2);
if (copy_to_user(arg, &args,
sizeof(struct vlan_ioctl_args))) {
err = -EFAULT;
}
break;
case GET_VLAN_VID_CMD:
err = 0;
vlan_dev_get_vid(dev, &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);
err = -EINVAL;
break;
}
out:
rtnl_unlock();
return err;
}
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
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