Patch "net: ipv4: dst for local input routes should use l3mdev if relevant" has been added to the 4.9-stable tree

Patch "net: ipv4: dst for local input routes should use l3mdev if relevant" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    net: ipv4: dst for local input routes should use l3mdev if relevant

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-ipv4-dst-for-local-input-routes-should-use-l3mdev-if-relevant.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Jan 12 21:37:26 CET 2017
From: David Ahern <dsa@cumulusnetworks.com>
Date: Thu, 29 Dec 2016 15:29:03 -0800
Subject: net: ipv4: dst for local input routes should use l3mdev if relevant

From: David Ahern <dsa@cumulusnetworks.com>


[ Upstream commit f5a0aab84b74de68523599817569c057c7ac1622 ]

IPv4 output routes already use l3mdev device instead of loopback for dst's
if it is applicable. Change local input routes to do the same.

This fixes icmp responses for unreachable UDP ports which are directed
to the wrong table after commit 9d1a6c4ea43e4 because local_input
routes use the loopback device. Moving from ingress device to loopback
loses the L3 domain causing responses based on the dst to get to lost.

Fixes: 9d1a6c4ea43e4 ("net: icmp_route_lookup should use rt dev to
		       determine L3 domain")
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv4/route.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1902,7 +1902,8 @@ local_input:
 		}
 	}
 
-	rth = rt_dst_alloc(net->loopback_dev, flags | RTCF_LOCAL, res.type,
+	rth = rt_dst_alloc(l3mdev_master_dev_rcu(dev) ? : net->loopback_dev,
+			   flags | RTCF_LOCAL, res.type,
 			   IN_DEV_CONF_GET(in_dev, NOPOLICY), false, do_cache);
 	if (!rth)
 		goto e_nobufs;


Patches currently in stable-queue which might be from dsa@cumulusnetworks.com are

queue-4.9/net-vrf-drop-conntrack-data-after-pass-through-vrf-device-on-tx.patch
queue-4.9/net-ipv4-fix-multipath-selection-with-vrf.patch
queue-4.9/net-ipv4-dst-for-local-input-routes-should-use-l3mdev-if-relevant.patch
queue-4.9/net-vrf-add-missing-rx-counters.patch
queue-4.9/net-vrf-do-not-allow-table-id-0.patch
queue-4.9/net-vrf-fix-nat-within-a-vrf.patch
queue-4.9/net-fix-incorrect-original-ingress-device-index-in-pktinfo.patch