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l2tp: fix l2tp_eth module loading

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The l2tp_eth module crashes if its netlink callbacks are run when the
pernet data aren't initialised.

We should normally register_pernet_device() before the genl callbacks.
However, the pernet data only maintain a list of l2tpeth interfaces,
and this list is never used. So let's just drop pernet handling
instead.

Fixes: d9e31d17ce ("l2tp: Add L2TP ethernet pseudowire support")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Guillaume Nault 2017-09-28 15:44:38 +02:00 committed by David S. Miller
parent c79c314bb4
commit 9f775ead5e
1 changed files with 2 additions and 49 deletions
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51
net/l2tp/l2tp_eth.c
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@ -44,7 +44,6 @@ struct l2tp_eth {
struct net_device *dev;
struct sock *tunnel_sock;
struct l2tp_session *session;
struct list_head list;
atomic_long_t tx_bytes;
atomic_long_t tx_packets;
atomic_long_t tx_dropped;
@ -58,17 +57,6 @@ struct l2tp_eth_sess {
struct net_device *dev;
};
/* per-net private data for this module */
static unsigned int l2tp_eth_net_id;
struct l2tp_eth_net {
struct list_head l2tp_eth_dev_list;
spinlock_t l2tp_eth_lock;
};
static inline struct l2tp_eth_net *l2tp_eth_pernet(struct net *net)
{
return net_generic(net, l2tp_eth_net_id);
}
static int l2tp_eth_dev_init(struct net_device *dev)
{
@ -84,12 +72,6 @@ static int l2tp_eth_dev_init(struct net_device *dev)
static void l2tp_eth_dev_uninit(struct net_device *dev)
{
struct l2tp_eth *priv = netdev_priv(dev);
struct l2tp_eth_net *pn = l2tp_eth_pernet(dev_net(dev));
spin_lock(&pn->l2tp_eth_lock);
list_del_init(&priv->list);
spin_unlock(&pn->l2tp_eth_lock);
dev_put(dev);
}
@ -273,7 +255,6 @@ static int l2tp_eth_create(struct net *net, struct l2tp_tunnel *tunnel,
struct l2tp_eth *priv;
struct l2tp_eth_sess *spriv;
int rc;
struct l2tp_eth_net *pn;
if (cfg->ifname) {
strlcpy(name, cfg->ifname, IFNAMSIZ);
@ -305,7 +286,6 @@ static int l2tp_eth_create(struct net *net, struct l2tp_tunnel *tunnel,
priv = netdev_priv(dev);
priv->dev = dev;
priv->session = session;
INIT_LIST_HEAD(&priv->list);
priv->tunnel_sock = tunnel->sock;
session->recv_skb = l2tp_eth_dev_recv;
@ -326,10 +306,6 @@ static int l2tp_eth_create(struct net *net, struct l2tp_tunnel *tunnel,
strlcpy(session->ifname, dev->name, IFNAMSIZ);
dev_hold(dev);
pn = l2tp_eth_pernet(dev_net(dev));
spin_lock(&pn->l2tp_eth_lock);
list_add(&priv->list, &pn->l2tp_eth_dev_list);
spin_unlock(&pn->l2tp_eth_lock);
return 0;
@ -342,22 +318,6 @@ out:
return rc;
}
static __net_init int l2tp_eth_init_net(struct net *net)
{
struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id);
INIT_LIST_HEAD(&pn->l2tp_eth_dev_list);
spin_lock_init(&pn->l2tp_eth_lock);
return 0;
}
static struct pernet_operations l2tp_eth_net_ops = {
.init = l2tp_eth_init_net,
.id = &l2tp_eth_net_id,
.size = sizeof(struct l2tp_eth_net),
};
static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = {
.session_create = l2tp_eth_create,
@ -371,25 +331,18 @@ static int __init l2tp_eth_init(void)
err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops);
if (err)
goto out;
err = register_pernet_device(&l2tp_eth_net_ops);
if (err)
goto out_unreg;
goto err;
pr_info("L2TP ethernet pseudowire support (L2TPv3)\n");
return 0;
out_unreg:
l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
out:
err:
return err;
}
static void __exit l2tp_eth_exit(void)
{
unregister_pernet_device(&l2tp_eth_net_ops);
l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
}