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[PATCH 4.2.y-ckt 36/53] route: do not cache fib route info on local routes with oif

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4.2.8-ckt11 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Chris Friesen <chris.friesen@windriver.com>

[ Upstream commit d6d5e999e5df67f8ec20b6be45e2229455ee3699 ]

For local routes that require a particular output interface we do not want
to cache the result.  Caching the result causes incorrect behaviour when
there are multiple source addresses on the interface.  The end result
being that if the intended recipient is waiting on that interface for the
packet he won't receive it because it will be delivered on the loopback
interface and the IP_PKTINFO ipi_ifindex will be set to the loopback
interface as well.

This can be tested by running a program such as "dhcp_release" which
attempts to inject a packet on a particular interface so that it is
received by another program on the same board.  The receiving process
should see an IP_PKTINFO ipi_ifndex value of the source interface
(e.g., eth1) instead of the loopback interface (e.g., lo).  The packet
will still appear on the loopback interface in tcpdump but the important
aspect is that the CMSG info is correct.

Sample dhcp_release command line:

   dhcp_release eth1 192.168.204.222 02:11:33:22:44:66

Signed-off-by: Allain Legacy <allain.legacy@windriver.com>
Signed off-by: Chris Friesen <chris.friesen@windriver.com>
Reviewed-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 net/ipv4/route.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index eca349c..9bd15fb 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1974,6 +1974,18 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
 		 */
 		if (fi && res->prefixlen < 4)
 			fi = NULL;
+	} else if ((type == RTN_LOCAL) && (orig_oif != 0) &&
+		   (orig_oif != dev_out->ifindex)) {
+		/* For local routes that require a particular output interface
+		 * we do not want to cache the result.  Caching the result
+		 * causes incorrect behaviour when there are multiple source
+		 * addresses on the interface, the end result being that if the
+		 * intended recipient is waiting on that interface for the
+		 * packet he won't receive it because it will be delivered on
+		 * the loopback interface and the IP_PKTINFO ipi_ifindex will
+		 * be set to the loopback interface as well.
+		 */
+		fi = NULL;
 	}
 
 	fnhe = NULL;
-- 
2.7.4

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[4.2.y-ckt stable] Linux 4.2.8-ckt11 stable review Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:00 +0200
  [PATCH 4.2.y-ckt 19/53] ALSA: usb-audio: Yet another Phoneix Audio device quirk Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:00 +0200
  [PATCH 4.2.y-ckt 32/53] net: fec: only clear a queue's work bit if the queue was emptied Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 27/53] macvtap: segmented packet is consumed Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 42/53] net_sched: update hierarchical backlog too Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 30/53] bridge: fix igmp / mld query parsing Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 24/53] workqueue: fix rebind bound workers warning Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 25/53] ocfs2: fix posix_acl_create deadlock Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 39/53] ipv4/fib: don't warn when primary address is missing if in_dev is dead Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
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  [PATCH 4.2.y-ckt 46/53] net: fix infoleak in llc Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
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  [PATCH 4.2.y-ckt 36/53] route: do not cache fib route info on local routes with oif Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 43/53] sch_htb: update backlog as well Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
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