linux-kernel - [44/74] tcp: update the netstamp_needed counter when cloning sockets

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Message-Id: <20100204171513.218726173@linux.site>
Date:	Thu, 04 Feb 2010 09:12:15 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Octavian Purdila <opurdila@...acom.com>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [44/74] tcp: update the netstamp_needed counter when cloning sockets

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Octavian Purdila <opurdila@...acom.com>

[ Upstream commit 704da560c0a0120d8869187f511491a00951a1d3 ]

This fixes a netstamp_needed accounting issue when the listen socket
has SO_TIMESTAMP set:

    s = socket(AF_INET, SOCK_STREAM, 0);
    setsockopt(s, SOL_SOCKET, SO_TIMESTAMP, 1); -> netstamp_needed = 1
    bind(s, ...);
    listen(s, ...);
    s2 = accept(s, ...); -> netstamp_needed = 1
    close(s2); -> netstamp_needed = 0
    close(s); -> netstamp_needed = -1

Signed-off-by: Octavian Purdila <opurdila@...acom.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/core/sock.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1181,6 +1181,10 @@ struct sock *sk_clone(const struct sock 
 
 		if (newsk->sk_prot->sockets_allocated)
 			percpu_counter_inc(newsk->sk_prot->sockets_allocated);
+
+		if (sock_flag(newsk, SOCK_TIMESTAMP) ||
+		    sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
+			net_enable_timestamp();
 	}
 out:
 	return newsk;


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