Beispiel #1
0
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;
}
Beispiel #3
0
/* 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;
}