netdev - [PATCH net] ipv4: Set offload_failed flag in fibmatch results

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Date: Tue, 26 Sep 2023 14:27:30 -0400
From: Benjamin Poirier <bpoirier@...dia.com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Amit Cohen <amcohen@...dia.com>,
	Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net] ipv4: Set offload_failed flag in fibmatch results

Due to a small omission, the offload_failed flag is missing from ipv4
fibmatch results. Make sure it is set correctly.

The issue can be witnessed using the following commands:
echo "1 1" > /sys/bus/netdevsim/new_device
ip link add dummy1 up type dummy
ip route add 192.0.2.0/24 dev dummy1
echo 1 > /sys/kernel/debug/netdevsim/netdevsim1/fib/fail_route_offload
ip route add 198.51.100.0/24 dev dummy1
ip route
	# 192.168.15.0/24 has rt_trap
	# 198.51.100.0/24 has rt_offload_failed
ip route get 192.168.15.1 fibmatch
	# Result has rt_trap
ip route get 198.51.100.1 fibmatch
	# Result differs from the route shown by `ip route`, it is missing
	# rt_offload_failed
ip link del dev dummy1
echo 1 > /sys/bus/netdevsim/del_device

Fixes: 36c5100e859d ("IPv4: Add "offload failed" indication to routes")
Signed-off-by: Benjamin Poirier <bpoirier@...dia.com>
Reviewed-by: Ido Schimmel <idosch@...dia.com>
---
 net/ipv4/route.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index a57062283219..b214b5a2e045 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -3417,6 +3417,8 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
 				    fa->fa_type == fri.type) {
 					fri.offload = READ_ONCE(fa->offload);
 					fri.trap = READ_ONCE(fa->trap);
+					fri.offload_failed =
+						READ_ONCE(fa->offload_failed);
 					break;
 				}
 			}
-- 
2.40.1