static void __vlan_device_event(struct net_device *dev, unsigned long event)
{
switch (event) {
case NETDEV_CHANGENAME:
vlan_proc_rem_dev(dev);
if (vlan_proc_add_dev(dev) < 0)
pr_warn("failed to change proc name for %s\n",
dev->name);
break;
case NETDEV_REGISTER:
if (vlan_proc_add_dev(dev) < 0)
pr_warn("failed to add proc entry for %s\n", dev->name);
break;
case NETDEV_UNREGISTER:
vlan_proc_rem_dev(dev);
break;
}
}
/* 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;
spin_lock_bh(&vlan_group_lock);
grp = __vlan_find_group(real_dev_ifindex);
spin_unlock_bh(&vlan_group_lock);
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);
}
br_write_lock(BR_NETPROTO_LOCK);
grp->vlan_devices[vlan_id] = NULL;
br_write_unlock(BR_NETPROTO_LOCK);
/* 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);
spin_lock_bh(&vlan_group_lock);
__grp_unhash(grp);
spin_unlock_bh(&vlan_group_lock);
/* Free the group, after we have removed it
* from the hash.
*/
kfree(grp);
grp = NULL;
ret = 1;
}
MOD_DEC_USE_COUNT;
}
}
return ret;
}
/* 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_RX | 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;
}