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kernel-ark/net/8021q/vlan.c
Pavel Emelyanov 3f03e38789 [VLAN]: Fix potential race in vlan_cleanup_module vs vlan_ioctl_handler. 
The vlan module cleanup function starts with

	vlan_netlink_fini();
	vlan_ioctl_set(NULL);

The first call removes all the vlan devices and
the second one closes the vlan ioctl.

AFAIS there's a tiny race window between these two
calls - after rtnl unregistered all the vlans, but
the ioctl handler isn't set to NULL yet, user can
manage to call this ioctl and create one vlan device,
and that this function will later BUG_ON seeing
non-emply hashes.

I think, that we must first close the vlan ioctl
and only after this remove all the vlans with the
vlan_netlink_fini() call.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-12-11 02:45:32 -08:00

856 lines
21 KiB
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Raw Blame History

/*
* 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 <net/net_namespace.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(struct net *net, 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_ioctl_set(NULL);
vlan_netlink_fini();
/* 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 const struct header_ops vlan_header_ops = {
.create = vlan_dev_hard_header,
.rebuild = vlan_dev_rebuild_header,
.parse = eth_header_parse,
};
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);
/* ipv6 shared card related stuff */
dev->dev_id = real_dev->dev_id;
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->header_ops = real_dev->header_ops;
dev->hard_header_len = real_dev->hard_header_len;
dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
} else {
dev->header_ops = &vlan_header_ops;
dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
dev->hard_start_xmit = vlan_dev_hard_start_xmit;
}
lockdep_set_class(&dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
return 0;
}
void vlan_setup(struct net_device *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_mac_address = vlan_set_mac_address;
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;
#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 (dev->nd_net != &init_net)
return NOTIFY_DONE;
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;
flgs = vlandev->flags;
if (!(flgs & IFF_UP))
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(struct net *net, 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(&init_net, 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);
err = 0;
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))
break;
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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