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Subject[PATCH 08/10] af_unix: Unsubscribe sockets from their multicast groups on RCV_SHUTDOWN
Date
From: Alban Crequy <alban.crequy@collabora.co.uk>

Signed-off-by: Alban Crequy <alban.crequy@collabora.co.uk>
Reviewed-by: Ian Molton <ian.molton@collabora.co.uk>
---
net/unix/af_unix.c | 35 +++++++++++++++++++++++++++++++++++
1 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index bd9dc58..07e6b05 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -2841,6 +2841,10 @@ static int unix_shutdown(struct socket *sock, int mode)
{
struct sock *sk = sock->sk;
struct sock *other;
+#ifdef CONFIG_UNIX_MULTICAST
+ struct unix_sock *u = unix_sk(sk);
+ int unsubscribed = 0;
+#endif

mode = (mode+1)&(RCV_SHUTDOWN|SEND_SHUTDOWN);

@@ -2852,7 +2856,38 @@ static int unix_shutdown(struct socket *sock, int mode)
other = unix_peer(sk);
if (other)
sock_hold(other);
+
+#ifdef CONFIG_UNIX_MULTICAST
+ /* If the socket subscribed to a multicast group and it is shutdown
+ * with (mode&RCV_SHUTDOWN), it should be unsubscribed or at least
+ * stop blocking the peers */
+ if (mode&RCV_SHUTDOWN) {
+ struct unix_mcast *node;
+ struct hlist_node *pos;
+ struct hlist_node *pos_tmp;
+
+ spin_lock(&unix_multicast_lock);
+ hlist_for_each_entry_safe(node, pos, pos_tmp,
+ &u->mcast_subscriptions,
+ subscription_node) {
+ hlist_del_rcu(&node->member_node);
+ hlist_del_rcu(&node->subscription_node);
+ atomic_dec(&node->group->mcast_members_cnt);
+ atomic_inc(&node->group->mcast_membership_generation);
+ hlist_add_head_rcu(&node->member_dead_node,
+ &node->group->mcast_dead_members);
+ unsubscribed = 1;
+ }
+ spin_unlock(&unix_multicast_lock);
+ }
+#endif
unix_state_unlock(sk);
+
+#ifdef CONFIG_UNIX_MULTICAST
+ if (unsubscribed)
+ wake_up_interruptible_all(&u->peer_wait);
+#endif
+
sk->sk_state_change(sk);

if (other &&
--
1.7.7.6


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