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l2tp: don't set sk_user_data in tunnel socket

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l2tp no longer uses the tunnel socket's sk_user_data so drop the code
which sets it.

In l2tp_validate_socket use l2tp_sk_to_tunnel to check whether a given
socket is already attached to an l2tp tunnel since we can no longer
use non-null sk_user_data to indicate this.

Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: Tom Parkin <tparkin@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
James Chapman 2024-07-29 16:38:04 +01:00 committed by David S. Miller
parent eeb11209e0
commit 4a4cd70369
1 changed files with 6 additions and 4 deletions
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10
net/l2tp/l2tp_core.c
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@ -1263,7 +1263,6 @@ static void l2tp_tunnel_destruct(struct sock *sk)
/* Remove hooks into tunnel socket */
write_lock_bh(&sk->sk_callback_lock);
sk->sk_destruct = tunnel->old_sk_destruct;
sk->sk_user_data = NULL;
write_unlock_bh(&sk->sk_callback_lock);
/* Call the original destructor */
@ -1554,6 +1553,8 @@ EXPORT_SYMBOL_GPL(l2tp_tunnel_create);
static int l2tp_validate_socket(const struct sock *sk, const struct net *net,
enum l2tp_encap_type encap)
{
struct l2tp_tunnel *tunnel;
if (!net_eq(sock_net(sk), net))
return -EINVAL;
@ -1567,8 +1568,11 @@ static int l2tp_validate_socket(const struct sock *sk, const struct net *net,
(encap == L2TP_ENCAPTYPE_IP && sk->sk_protocol != IPPROTO_L2TP))
return -EPROTONOSUPPORT;
if (sk->sk_user_data)
tunnel = l2tp_sk_to_tunnel(sk);
if (tunnel) {
l2tp_tunnel_dec_refcount(tunnel);
return -EBUSY;
}
return 0;
}
@ -1607,12 +1611,10 @@ int l2tp_tunnel_register(struct l2tp_tunnel *tunnel, struct net *net,
ret = l2tp_validate_socket(sk, net, tunnel->encap);
if (ret < 0)
goto err_inval_sock;
rcu_assign_sk_user_data(sk, tunnel);
write_unlock_bh(&sk->sk_callback_lock);
if (tunnel->encap == L2TP_ENCAPTYPE_UDP) {
struct udp_tunnel_sock_cfg udp_cfg = {
.sk_user_data = tunnel,
.encap_type = UDP_ENCAP_L2TPINUDP,
.encap_rcv = l2tp_udp_encap_recv,
.encap_err_rcv = l2tp_udp_encap_err_recv,