From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steffen Klassert Subject: [PATCH RFC 1/2] ipv6: Fix after pmtu events dissapearing host routes Date: Wed, 28 Jan 2015 13:11:51 +0100 Message-ID: <20150128121150.GN13046@secunet.com> References: <54C78B8D.1070104@huawei.com> <20150128121026.GM13046@secunet.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Cc: netdev , "David S. Miller" To: Yang Yingliang Return-path: Received: from a.mx.secunet.com ([195.81.216.161]:55848 "EHLO a.mx.secunet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933862AbbA1UlU (ORCPT ); Wed, 28 Jan 2015 15:41:20 -0500 Content-Disposition: inline In-Reply-To: <20150128121026.GM13046@secunet.com> Sender: netdev-owner@vger.kernel.org List-ID: We currently don't clone host routes before we use them. If a pmtu event is received on such a route, it gets an expires value. As soon as the expiration time is elapsed, the route is deleted. As a result, the host is not reachable any more. We fix this by cloning host routes if they are gatewayed, i.e. if pmtu events can happen. Signed-off-by: Steffen Klassert --- net/ipv6/route.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv6/route.c b/net/ipv6/route.c index c910831..3e864e7 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -961,7 +961,7 @@ redo_rt6_select: if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY))) nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); - else if (!(rt->dst.flags & DST_HOST)) + else if (!(rt->dst.flags & DST_HOST) || (rt->rt6i_flags & RTF_GATEWAY)) nrt = rt6_alloc_clone(rt, &fl6->daddr); else goto out2; -- 1.9.1