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Message-Id: <5fdd584d53f0807f743c07b1c0381cf5649495cd.1674233458.git.dcaratti@redhat.com>
Date: Fri, 20 Jan 2023 18:01:40 +0100
From: Davide Caratti <dcaratti@...hat.com>
To: jhs@...atatu.com
Cc: jiri@...nulli.us, lucien.xin@...il.com, marcelo.leitner@...il.com,
netdev@...r.kernel.org, pabeni@...hat.com, wizhao@...hat.com,
xiyou.wangcong@...il.com
Subject: [PATCH net-next 2/2] act_mirred: use the backlog for nested calls to mirred ingress
William reports kernel soft-lockups on some OVS topologies when TC mirred
egress->ingress action is hit by local TCP traffic [1].
The same can also be reproduced with SCTP (thanks Xin for verifying), when
client and server reach themselves through mirred egress to ingress, and
one of the two peers sends a "heartbeat" packet (from within a timer).
Enqueueing to backlog proved to fix this soft lockup; however, as Cong
noticed [2], we should preserve - when possible - the current mirred
behavior that counts as "overlimits" any eventual packet drop subsequent to
the mirred forwarding action [3]. A compromise solution might use the
backlog only when tcf_mirred_act() has a nest level greater than one:
change tcf_mirred_forward() accordingly.
Also, add a kselftest that can reproduce the lockup and verifies TC mirred
ability to account for further packet drops after TC mirred egress->ingress
(when the nest level is 1).
[1] https://lore.kernel.org/netdev/33dc43f587ec1388ba456b4915c75f02a8aae226.1663945716.git.dcaratti@redhat.com/
[2] https://lore.kernel.org/netdev/Y0w%2FWWY60gqrtGLp@pop-os.localdomain/
[3] such behavior is not guaranteed: for example, if RPS or skb RX
timestamping is enabled on the mirred target device, the kernel
can defer receiving the skb and return NET_RX_SUCCESS inside
tcf_mirred_forward().
Reported-by: William Zhao <wizhao@...hat.com>
CC: Xin Long <lucien.xin@...il.com>
Signed-off-by: Davide Caratti <dcaratti@...hat.com>
---
net/sched/act_mirred.c | 7 +++
.../selftests/net/forwarding/tc_actions.sh | 49 ++++++++++++++++++-
2 files changed, 55 insertions(+), 1 deletion(-)
diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index c8abb5136491..8037ec9b1d31 100644
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -206,12 +206,19 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
return err;
}
+static bool is_mirred_nested(void)
+{
+ return unlikely(__this_cpu_read(mirred_nest_level) > 1);
+}
+
static int tcf_mirred_forward(bool want_ingress, struct sk_buff *skb)
{
int err;
if (!want_ingress)
err = tcf_dev_queue_xmit(skb, dev_queue_xmit);
+ else if (is_mirred_nested())
+ err = netif_rx(skb);
else
err = netif_receive_skb(skb);
diff --git a/tools/testing/selftests/net/forwarding/tc_actions.sh b/tools/testing/selftests/net/forwarding/tc_actions.sh
index 1e0a62f638fe..919c0dd9fe4b 100755
--- a/tools/testing/selftests/net/forwarding/tc_actions.sh
+++ b/tools/testing/selftests/net/forwarding/tc_actions.sh
@@ -3,7 +3,8 @@
ALL_TESTS="gact_drop_and_ok_test mirred_egress_redirect_test \
mirred_egress_mirror_test matchall_mirred_egress_mirror_test \
- gact_trap_test mirred_egress_to_ingress_test"
+ gact_trap_test mirred_egress_to_ingress_test \
+ mirred_egress_to_ingress_tcp_test"
NUM_NETIFS=4
source tc_common.sh
source lib.sh
@@ -198,6 +199,52 @@ mirred_egress_to_ingress_test()
log_test "mirred_egress_to_ingress ($tcflags)"
}
+mirred_egress_to_ingress_tcp_test()
+{
+ local tmpfile=$(mktemp) tmpfile1=$(mktemp)
+
+ RET=0
+ dd conv=sparse status=none if=/dev/zero bs=1M count=2 of=$tmpfile
+ tc filter add dev $h1 protocol ip pref 100 handle 100 egress flower \
+ $tcflags ip_proto tcp src_ip 192.0.2.1 dst_ip 192.0.2.2 \
+ action ct commit nat src addr 192.0.2.2 pipe \
+ action ct clear pipe \
+ action ct commit nat dst addr 192.0.2.1 pipe \
+ action ct clear pipe \
+ action skbedit ptype host pipe \
+ action mirred ingress redirect dev $h1
+ tc filter add dev $h1 protocol ip pref 101 handle 101 egress flower \
+ $tcflags ip_proto icmp \
+ action mirred ingress redirect dev $h1
+ tc filter add dev $h1 protocol ip pref 102 handle 102 ingress flower \
+ ip_proto icmp \
+ action drop
+
+ ip vrf exec v$h1 nc --recv-only -w10 -l -p 12345 -o $tmpfile1 &
+ local rpid=$!
+ ip vrf exec v$h1 nc -w1 --send-only 192.0.2.2 12345 <$tmpfile
+ wait -n $rpid
+ cmp -s $tmpfile $tmpfile1
+ check_err $? "server output check failed"
+
+ $MZ $h1 -c 10 -p 64 -a $h1mac -b $h1mac -A 192.0.2.1 -B 192.0.2.1 \
+ -t icmp "ping,id=42,seq=5" -q
+ tc_check_packets "dev $h1 egress" 101 10
+ check_err $? "didn't mirred redirect ICMP"
+ tc_check_packets "dev $h1 ingress" 102 10
+ check_err $? "didn't drop mirred ICMP"
+ local overlimits=$(tc_rule_stats_get ${h1} 101 egress .overlimits)
+ test ${overlimits} = 10
+ check_err $? "wrong overlimits, expected 10 got ${overlimits}"
+
+ tc filter del dev $h1 egress protocol ip pref 100 handle 100 flower
+ tc filter del dev $h1 egress protocol ip pref 101 handle 101 flower
+ tc filter del dev $h1 ingress protocol ip pref 102 handle 102 flower
+
+ rm -f $tmpfile $tmpfile1
+ log_test "mirred_egress_to_ingress_tcp ($tcflags)"
+}
+
setup_prepare()
{
h1=${NETIFS[p1]}
--
2.38.1
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