linux-kernel - [PATCH 5.9 004/757] ipv4: Restore flowi4_oif update before call to xfrm_lookup

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Message-Id: <20201027135450.729766636@linuxfoundation.org>
Date:   Tue, 27 Oct 2020 14:44:14 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tobias Brunner <tobias@...ongswan.org>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 5.9 004/757] ipv4: Restore flowi4_oif update before call to xfrm_lookup_route

From: David Ahern <dsahern@...nel.org>

[ Upstream commit 874fb9e2ca949b443cc419a4f2227cafd4381d39 ]

Tobias reported regressions in IPsec tests following the patch
referenced by the Fixes tag below. The root cause is dropping the
reset of the flowi4_oif after the fib_lookup. Apparently it is
needed for xfrm cases, so restore the oif update to ip_route_output_flow
right before the call to xfrm_lookup_route.

Fixes: 2fbc6e89b2f1 ("ipv4: Update exception handling for multipath routes via same device")
Reported-by: Tobias Brunner <tobias@...ongswan.org>
Signed-off-by: David Ahern <dsahern@...nel.org>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv4/route.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2769,10 +2769,12 @@ struct rtable *ip_route_output_flow(stru
 	if (IS_ERR(rt))
 		return rt;
 
-	if (flp4->flowi4_proto)
+	if (flp4->flowi4_proto) {
+		flp4->flowi4_oif = rt->dst.dev->ifindex;
 		rt = (struct rtable *)xfrm_lookup_route(net, &rt->dst,
 							flowi4_to_flowi(flp4),
 							sk, 0);
+	}
 
 	return rt;
 }