l2tp: close sessions in ip socket destroy callback

l2tp_core hooks UDP's .destroy handler to gain advance warning of a tunnel
socket being closed from userspace.  We need to do the same thing for
IP-encapsulation sockets.

Signed-off-by: Tom Parkin <tparkin@katalix.com>
Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c
index 7f41b70..571db8d 100644 (file)
--- a/net/l2tp/l2tp_ip.c
+++ b/net/l2tp/l2tp_ip.c
@@ -228,10 +228,16 @@ static void l2tp_ip_close(struct sock *sk, long timeout)
 static void l2tp_ip_destroy_sock(struct sock *sk)
 {
        struct sk_buff *skb;
+       struct l2tp_tunnel *tunnel = l2tp_sock_to_tunnel(sk);
 
        while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL)
                kfree_skb(skb);
 
+       if (tunnel) {
+               l2tp_tunnel_closeall(tunnel);
+               sock_put(sk);
+       }
+
        sk_refcnt_debug_dec(sk);
 }
 

diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c
index 41f2f81..c74f5a9 100644 (file)
--- a/net/l2tp/l2tp_ip6.c
+++ b/net/l2tp/l2tp_ip6.c
@@ -241,10 +241,17 @@ static void l2tp_ip6_close(struct sock *sk, long timeout)
 
 static void l2tp_ip6_destroy_sock(struct sock *sk)
 {
+       struct l2tp_tunnel *tunnel = l2tp_sock_to_tunnel(sk);
+
        lock_sock(sk);
        ip6_flush_pending_frames(sk);
        release_sock(sk);
 
+       if (tunnel) {
+               l2tp_tunnel_closeall(tunnel);
+               sock_put(sk);
+       }
+
        inet6_destroy_sock(sk);
 }