linux-kernel - [PATCH linux-2.6 v2] IPv6: Create temporary address if none exists.

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Date:	Mon, 27 Sep 2010 13:04:30 -0400
From:	Glenn Wurster <gwurster@....carleton.ca>
To:	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	Stephen Hemminger <shemminger@...tta.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH linux-2.6 v2] IPv6:  Create temporary address if none
	exists.

If privacy extentions are enabled, but no current temporary address exists,
then create one when we get a router advertisement.

Version 2, now with 100% fewer line wraps.  Thanks to David Miller for
pointing out the line wrapping issue.

Signed-off-by: Glenn Wurster <gwurster@....carleton.ca>
---
 net/ipv6/addrconf.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index ab70a3f..cfee6ae 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2022,10 +2022,11 @@ ok:
 					ipv6_ifa_notify(0, ift);
 			}
 
-			if (create && in6_dev->cnf.use_tempaddr > 0) {
+			if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
 				/*
 				 * When a new public address is created as described in [ADDRCONF],
-				 * also create a new temporary address.
+				 * also create a new temporary address. Also create a temporary
+				 * address if it's enabled but no temporary address currently exists.
 				 */
 				read_unlock_bh(&in6_dev->lock);
 				ipv6_create_tempaddr(ifp, NULL);
-- 
1.5.6.5


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