netdev - [PATCH 4/5] netlink: call unbind when releasing socket

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Date:	Mon, 22 Dec 2014 18:56:38 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	netdev@...r.kernel.org
Cc:	Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 4/5] netlink: call unbind when releasing socket

From: Johannes Berg <johannes.berg@...el.com>

Currently, netlink_unbind() is only called when the socket
explicitly unbinds, which limits its usefulness (luckily
there are no users of it yet anyway.)

Call netlink_unbind() also when a socket is released, so it
becomes possible to track listeners with this callback and
without also implementing a netlink notifier (and checking
netlink_has_listeners() in there.)

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
---
 net/netlink/af_netlink.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index df6086f69592..07a903de4439 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1266,6 +1266,13 @@ static int netlink_release(struct socket *sock)
 		netlink_table_ungrab();
 	}
 
+	if (nlk->netlink_unbind) {
+		int i;
+
+		for (i = 0; i < nlk->ngroups; i++)
+			if (test_bit(i, nlk->groups))
+				nlk->netlink_unbind(i + 1);
+	}
 	kfree(nlk->groups);
 	nlk->groups = NULL;
 
-- 
2.1.1

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