From: Jamal Hadi Salim <jhs@mojatatu.com>
To: netdev@vger.kernel.org
Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
pabeni@redhat.com, horms@kernel.org, jiri@resnulli.us,
stephen@networkplumber.org, victor@mojatatu.com,
savy@syst3mfailure.io, will@willsroot.io, xmei5@asu.edu,
pctammela@mojatatu.com, kuniyu@google.com, toke@toke.dk,
willemdebruijnkernel@gmail.com, hxzene@gmail.com,
Jamal Hadi Salim <jhs@mojatatu.com>
Subject: [PATCH net 8/9] selftests/tc-testing: Add mirred test cases exercising loops
Date: Sun, 26 Apr 2026 15:09:15 -0400 [thread overview]
Message-ID: <20260426190916.128489-9-jhs@mojatatu.com> (raw)
In-Reply-To: <20260426190916.128489-1-jhs@mojatatu.com>
From: Victor Nogueira <victor@mojatatu.com>
Add mirred loop test cases to validate that those will be caught and other
test cases that were previously misinterpreted as loops by mirred.
This commit adds 12 test cases:
- Redirect multiport: dummy egress -> dev1 ingress -> dummy egress (Loop)
- Redirect singleport: dev1 ingress -> dev1 egress -> dev1 ingress (Loop)
- Redirect multiport: dev1 ingress -> dummy ingress -> dev1 egress (No Loop)
- Redirect multiport: dev1 ingress -> dummy ingress -> dev1 ingress (Loop)
- Redirect multiport: dev1 ingress -> dummy egress -> dev1 ingress (Loop)
- Redirect multiport: dummy egress -> dev1 ingress -> dummy egress, different prios (Loop)
- Redirect multiport: dev1 ingress -> dummy ingress -> dummy egress -> dev1 egress (No Loop)
- Redirect multiport: dev1 ingress -> dummy egress -> dev1 egress (No Loop)
- Redirect multiport: dev1 ingress -> dummy egress -> dummy ingress (No Loop)
- Redirect singleport: dev1 ingress -> dev1 ingress (Loop)
- Redirect singleport: dummy egress -> dummy ingress (No Loop)
- Redirect multiport: dev1 ingress -> dummy ingress -> dummy egress (No Loop)
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Victor Nogueira <victor@mojatatu.com>
---
.../tc-testing/tc-tests/actions/mirred.json | 616 +++++++++++++++++-
1 file changed, 615 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/tc-testing/tc-tests/actions/mirred.json b/tools/testing/selftests/tc-testing/tc-tests/actions/mirred.json
index b056eb966871..d0cad6571691 100644
--- a/tools/testing/selftests/tc-testing/tc-tests/actions/mirred.json
+++ b/tools/testing/selftests/tc-testing/tc-tests/actions/mirred.json
@@ -1144,6 +1144,620 @@
"teardown": [
"$TC qdisc del dev $DUMMY clsact"
]
+ },
+ {
+ "id": "531c",
+ "name": "Redirect multiport: dummy egress -> dev1 ingress -> dummy egress (Loop)",
+ "category": [
+ "filter",
+ "mirred"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin"
+ ]
+ },
+ "setup": [
+ "$IP link set dev $DUMMY up || true",
+ "$IP addr add 10.10.10.10/24 dev $DUMMY || true",
+ "$TC qdisc add dev $DUMMY clsact",
+ "$TC filter add dev $DUMMY egress protocol ip prio 10 matchall action mirred ingress redirect dev $DEV1 index 1",
+ "$TC qdisc add dev $DEV1 clsact",
+ "$TC filter add dev $DEV1 ingress protocol ip prio 10 matchall action mirred egress redirect dev $DUMMY index 2"
+ ],
+ "cmdUnderTest": "ping -c1 -W0.01 -I $DUMMY 10.10.10.1",
+ "expExitCode": "1",
+ "verifyCmd": "$TC -j -s actions get action mirred index 1",
+ "matchJSON": [
+ {
+ "total acts": 0
+ },
+ {
+ "actions": [
+ {
+ "order": 1,
+ "kind": "mirred",
+ "mirred_action": "redirect",
+ "direction": "ingress",
+ "index": 1,
+ "stats": {
+ "packets": 3
+ },
+ "not_in_hw": true
+ }
+ ]
+ }
+ ],
+ "teardown": [
+ "$TC qdisc del dev $DUMMY clsact",
+ "$TC qdisc del dev $DEV1 clsact"
+ ]
+ },
+ {
+ "id": "b1d7",
+ "name": "Redirect singleport: dev1 ingress -> dev1 egress -> dev1 ingress (Loop)",
+ "category": [
+ "filter",
+ "mirred"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin",
+ "scapyPlugin"
+ ]
+ },
+ "setup": [
+ "$TC qdisc add dev $DEV1 clsact",
+ "$TC filter add dev $DEV1 ingress protocol ip prio 10 matchall action mirred egress redirect dev $DEV1 index 1"
+ ],
+ "cmdUnderTest": "$TC filter add dev $DEV1 egress protocol ip prio 11 matchall action mirred ingress redirect dev $DEV1 index 2",
+ "scapy": [
+ {
+ "iface": "$DEV0",
+ "count": 1,
+ "packet": "Ether()/IP(dst='10.10.10.1', src='10.10.10.10')/ICMP()"
+ }
+ ],
+ "expExitCode": "0",
+ "verifyCmd": "$TC -j -s actions get action mirred index 1",
+ "matchJSON": [
+ {
+ "total acts": 0
+ },
+ {
+ "actions": [
+ {
+ "order": 1,
+ "kind": "mirred",
+ "mirred_action": "redirect",
+ "direction": "egress",
+ "index": 1,
+ "stats": {
+ "packets": 3
+ },
+ "not_in_hw": true
+ }
+ ]
+ }
+ ],
+ "teardown": [
+ "$TC qdisc del dev $DEV1 clsact"
+ ]
+ },
+ {
+ "id": "c66d",
+ "name": "Redirect multiport: dev1 ingress -> dummy ingress -> dev1 egress (No Loop)",
+ "category": [
+ "filter",
+ "mirred"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin",
+ "scapyPlugin"
+ ]
+ },
+ "setup": [
+ "$TC qdisc add dev $DEV1 clsact",
+ "$TC filter add dev $DEV1 ingress protocol ip prio 10 matchall action mirred ingress redirect dev $DUMMY index 1",
+ "$TC qdisc add dev $DUMMY clsact"
+ ],
+ "cmdUnderTest": "$TC filter add dev $DUMMY ingress protocol ip prio 11 matchall action mirred egress redirect dev $DEV1 index 2",
+ "scapy": [
+ {
+ "iface": "$DEV0",
+ "count": 1,
+ "packet": "Ether()/IP(dst='10.10.10.1', src='10.10.10.10')/ICMP()"
+ }
+ ],
+ "expExitCode": "0",
+ "verifyCmd": "$TC -j -s actions get action mirred index 1",
+ "matchJSON": [
+ {
+ "total acts": 0
+ },
+ {
+ "actions": [
+ {
+ "order": 1,
+ "kind": "mirred",
+ "mirred_action": "redirect",
+ "direction": "ingress",
+ "index": 1,
+ "stats": {
+ "packets": 1
+ },
+ "not_in_hw": true
+ }
+ ]
+ }
+ ],
+ "teardown": [
+ "$TC qdisc del dev $DEV1 clsact",
+ "$TC qdisc del dev $DUMMY clsact"
+ ]
+ },
+ {
+ "id": "aa99",
+ "name": "Redirect multiport: dev1 ingress -> dummy ingress -> dev1 ingress (Loop)",
+ "category": [
+ "filter",
+ "mirred"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin",
+ "scapyPlugin"
+ ]
+ },
+ "setup": [
+ "$TC qdisc add dev $DEV1 clsact",
+ "$TC filter add dev $DEV1 ingress protocol ip prio 10 matchall action mirred ingress redirect dev $DUMMY index 1",
+ "$TC qdisc add dev $DUMMY clsact"
+ ],
+ "cmdUnderTest": "$TC filter add dev $DUMMY ingress protocol ip prio 11 matchall action mirred ingress redirect dev $DEV1 index 2",
+ "scapy": [
+ {
+ "iface": "$DEV0",
+ "count": 1,
+ "packet": "Ether()/IP(dst='10.10.10.1', src='10.10.10.10')/ICMP()"
+ }
+ ],
+ "expExitCode": "0",
+ "verifyCmd": "$TC -j -s actions get action mirred index 1",
+ "matchJSON": [
+ {
+ "total acts": 0
+ },
+ {
+ "actions": [
+ {
+ "order": 1,
+ "kind": "mirred",
+ "mirred_action": "redirect",
+ "direction": "ingress",
+ "index": 1,
+ "stats": {
+ "packets": 2,
+ "overlimits": 1
+ },
+ "not_in_hw": true
+ }
+ ]
+ }
+ ],
+ "teardown": [
+ "$TC qdisc del dev $DEV1 clsact",
+ "$TC qdisc del dev $DUMMY clsact"
+ ]
+ },
+ {
+ "id": "37d7",
+ "name": "Redirect multiport: dev1 ingress -> dummy egress -> dev1 ingress (Loop)",
+ "category": [
+ "filter",
+ "mirred"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin",
+ "scapyPlugin"
+ ]
+ },
+ "setup": [
+ "$TC qdisc add dev $DEV1 clsact",
+ "$TC filter add dev $DEV1 ingress protocol ip prio 10 matchall action mirred egress redirect dev $DUMMY index 1",
+ "$TC qdisc add dev $DUMMY clsact"
+ ],
+ "cmdUnderTest": "$TC filter add dev $DUMMY egress protocol ip prio 11 matchall action mirred ingress redirect dev $DEV1 index 2",
+ "scapy": [
+ {
+ "iface": "$DEV0",
+ "count": 1,
+ "packet": "Ether()/IP(dst='10.10.10.1', src='10.10.10.10')/ICMP()"
+ }
+ ],
+ "expExitCode": "0",
+ "verifyCmd": "$TC -j -s actions get action mirred index 1",
+ "matchJSON": [
+ {
+ "total acts": 0
+ },
+ {
+ "actions": [
+ {
+ "order": 1,
+ "kind": "mirred",
+ "mirred_action": "redirect",
+ "direction": "egress",
+ "index": 1,
+ "stats": {
+ "packets": 3
+ },
+ "not_in_hw": true
+ }
+ ]
+ }
+ ],
+ "teardown": [
+ "$TC qdisc del dev $DEV1 clsact",
+ "$TC qdisc del dev $DUMMY clsact"
+ ]
+ },
+ {
+ "id": "6d02",
+ "name": "Redirect multiport: dummy egress -> dev1 ingress -> dummy egress, different prios (Loop)",
+ "category": [
+ "filter",
+ "mirred"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin"
+ ]
+ },
+ "setup": [
+ "$IP link set dev $DUMMY up || true",
+ "$IP addr add 10.10.10.10/24 dev $DUMMY || true",
+ "$TC qdisc add dev $DUMMY clsact",
+ "$TC filter add dev $DUMMY egress protocol ip prio 10 matchall action mirred ingress redirect dev $DEV1 index 1",
+ "$TC qdisc add dev $DEV1 clsact",
+ "$TC filter add dev $DEV1 ingress protocol ip prio 11 matchall action mirred egress redirect dev $DUMMY index 2"
+ ],
+ "cmdUnderTest": "ping -c1 -W0.01 -I $DUMMY 10.10.10.1",
+ "expExitCode": "1",
+ "verifyCmd": "$TC -j -s actions get action mirred index 1",
+ "matchJSON": [
+ {
+ "total acts": 0
+ },
+ {
+ "actions": [
+ {
+ "order": 1,
+ "kind": "mirred",
+ "mirred_action": "redirect",
+ "direction": "ingress",
+ "index": 1,
+ "stats": {
+ "packets": 3
+ },
+ "not_in_hw": true
+ }
+ ]
+ }
+ ],
+ "teardown": [
+ "$TC qdisc del dev $DUMMY clsact",
+ "$TC qdisc del dev $DEV1 clsact"
+ ]
+ },
+ {
+ "id": "8115",
+ "name": "Redirect multiport: dev1 ingress -> dummy ingress -> dummy egress -> dev1 egress (No Loop)",
+ "category": [
+ "filter",
+ "mirred"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin",
+ "scapyPlugin"
+ ]
+ },
+ "setup": [
+ "$TC qdisc add dev $DEV1 clsact",
+ "$TC filter add dev $DEV1 ingress protocol ip prio 10 matchall action mirred ingress redirect dev $DUMMY index 1",
+ "$TC qdisc add dev $DUMMY clsact",
+ "$TC filter add dev $DUMMY ingress protocol ip prio 11 matchall action mirred egress redirect dev $DUMMY index 2"
+ ],
+ "cmdUnderTest": "$TC filter add dev $DUMMY egress protocol ip prio 12 matchall action mirred egress redirect dev $DEV1 index 3",
+ "scapy": [
+ {
+ "iface": "$DEV0",
+ "count": 1,
+ "packet": "Ether()/IP(dst='10.10.10.1', src='10.10.10.10')/ICMP()"
+ }
+ ],
+ "expExitCode": "0",
+ "verifyCmd": "$TC -j -s actions get action mirred index 1",
+ "matchJSON": [
+ {
+ "total acts": 0
+ },
+ {
+ "actions": [
+ {
+ "order": 1,
+ "kind": "mirred",
+ "mirred_action": "redirect",
+ "direction": "ingress",
+ "index": 1,
+ "stats": {
+ "packets": 1
+ },
+ "not_in_hw": true
+ }
+ ]
+ }
+ ],
+ "teardown": [
+ "$TC qdisc del dev $DEV1 clsact",
+ "$TC qdisc del dev $DUMMY clsact"
+ ]
+ },
+ {
+ "id": "9eb3",
+ "name": "Redirect multiport: dev1 ingress -> dummy egress -> dev1 egress (No Loop)",
+ "category": [
+ "filter",
+ "mirred"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin",
+ "scapyPlugin"
+ ]
+ },
+ "setup": [
+ "$TC qdisc add dev $DEV1 clsact",
+ "$TC filter add dev $DEV1 ingress protocol ip prio 10 matchall action mirred egress redirect dev $DUMMY index 1",
+ "$TC qdisc add dev $DUMMY clsact"
+ ],
+ "cmdUnderTest": "$TC filter add dev $DUMMY egress protocol ip prio 11 matchall action mirred egress redirect dev $DEV1 index 2",
+ "scapy": [
+ {
+ "iface": "$DEV0",
+ "count": 1,
+ "packet": "Ether()/IP(dst='10.10.10.1', src='10.10.10.10')/ICMP()"
+ }
+ ],
+ "expExitCode": "0",
+ "verifyCmd": "$TC -j -s actions get action mirred index 1",
+ "matchJSON": [
+ {
+ "total acts": 0
+ },
+ {
+ "actions": [
+ {
+ "order": 1,
+ "kind": "mirred",
+ "mirred_action": "redirect",
+ "direction": "egress",
+ "index": 1,
+ "stats": {
+ "packets": 1
+ },
+ "not_in_hw": true
+ }
+ ]
+ }
+ ],
+ "teardown": [
+ "$TC qdisc del dev $DEV1 clsact",
+ "$TC qdisc del dev $DUMMY clsact"
+ ]
+ },
+ {
+ "id": "d837",
+ "name": "Redirect multiport: dev1 ingress -> dummy egress -> dummy ingress (No Loop)",
+ "category": [
+ "filter",
+ "mirred"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin",
+ "scapyPlugin"
+ ]
+ },
+ "setup": [
+ "$TC qdisc add dev $DEV1 clsact",
+ "$TC filter add dev $DEV1 ingress protocol ip prio 10 matchall action mirred egress redirect dev $DUMMY index 1",
+ "$TC qdisc add dev $DUMMY clsact"
+ ],
+ "cmdUnderTest": "$TC filter add dev $DUMMY egress protocol ip prio 11 matchall action mirred ingress redirect dev $DUMMY index 2",
+ "scapy": [
+ {
+ "iface": "$DEV0",
+ "count": 1,
+ "packet": "Ether()/IP(dst='10.10.10.1', src='10.10.10.10')/ICMP()"
+ }
+ ],
+ "expExitCode": "0",
+ "verifyCmd": "$TC -j -s actions get action mirred index 1",
+ "matchJSON": [
+ {
+ "total acts": 0
+ },
+ {
+ "actions": [
+ {
+ "order": 1,
+ "kind": "mirred",
+ "mirred_action": "redirect",
+ "direction": "egress",
+ "index": 1,
+ "stats": {
+ "packets": 1
+ },
+ "not_in_hw": true
+ }
+ ]
+ }
+ ],
+ "teardown": [
+ "$TC qdisc del dev $DEV1 clsact",
+ "$TC qdisc del dev $DUMMY clsact"
+ ]
+ },
+ {
+ "id": "2071",
+ "name": "Redirect singleport: dev1 ingress -> dev1 ingress (Loop)",
+ "category": [
+ "filter",
+ "mirred"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin",
+ "scapyPlugin"
+ ]
+ },
+ "setup": [
+ "$TC qdisc add dev $DEV1 clsact"
+ ],
+ "cmdUnderTest": "$TC filter add dev $DEV1 ingress protocol ip prio 10 matchall action mirred ingress redirect dev $DEV1 index 1",
+ "scapy": [
+ {
+ "iface": "$DEV0",
+ "count": 1,
+ "packet": "Ether()/IP(dst='10.10.10.1', src='10.10.10.10')/ICMP()"
+ }
+ ],
+ "expExitCode": "0",
+ "verifyCmd": "$TC -j -s actions get action mirred index 1",
+ "matchJSON": [
+ {
+ "total acts": 0
+ },
+ {
+ "actions": [
+ {
+ "order": 1,
+ "kind": "mirred",
+ "mirred_action": "redirect",
+ "direction": "ingress",
+ "index": 1,
+ "stats": {
+ "packets": 1,
+ "overlimits": 1
+ },
+ "not_in_hw": true
+ }
+ ]
+ }
+ ],
+ "teardown": [
+ "$TC qdisc del dev $DEV1 clsact"
+ ]
+ },
+ {
+ "id": "0101",
+ "name": "Redirect singleport: dummy egress -> dummy ingress (No Loop)",
+ "category": [
+ "filter",
+ "mirred"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin"
+ ]
+ },
+ "setup": [
+ "$IP addr add 10.10.10.10/24 dev $DUMMY || true",
+ "$TC qdisc add dev $DUMMY clsact",
+ "$TC filter add dev $DUMMY egress protocol ip prio 11 matchall action mirred ingress redirect dev $DUMMY index 1"
+ ],
+ "cmdUnderTest": "ping -c1 -W0.01 -I $DUMMY 10.10.10.1",
+ "expExitCode": "1",
+ "verifyCmd": "$TC -j -s actions get action mirred index 1",
+ "matchJSON": [
+ {
+ "total acts": 0
+ },
+ {
+ "actions": [
+ {
+ "order": 1,
+ "kind": "mirred",
+ "mirred_action": "redirect",
+ "direction": "ingress",
+ "index": 1,
+ "stats": {
+ "packets": 1
+ },
+ "not_in_hw": true
+ }
+ ]
+ }
+ ],
+ "teardown": [
+ "$TC qdisc del dev $DUMMY clsact"
+ ]
+ },
+ {
+ "id": "cf97",
+ "name": "Redirect multiport: dev1 ingress -> dummy ingress -> dummy egress (No Loop)",
+ "category": [
+ "filter",
+ "mirred"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin",
+ "scapyPlugin"
+ ]
+ },
+ "setup": [
+ "$TC qdisc add dev $DEV1 clsact",
+ "$TC filter add dev $DEV1 ingress protocol ip prio 10 matchall action mirred ingress redirect dev $DUMMY index 1",
+ "$TC qdisc add dev $DUMMY clsact"
+ ],
+ "cmdUnderTest": "$TC filter add dev $DUMMY ingress protocol ip prio 11 matchall action mirred egress redirect dev $DUMMY index 2",
+ "scapy": [
+ {
+ "iface": "$DEV0",
+ "count": 1,
+ "packet": "Ether()/IP(dst='10.10.10.1', src='10.10.10.10')/ICMP()"
+ }
+ ],
+ "expExitCode": "0",
+ "verifyCmd": "$TC -j -s actions get action mirred index 1",
+ "matchJSON": [
+ {
+ "total acts": 0
+ },
+ {
+ "actions": [
+ {
+ "order": 1,
+ "kind": "mirred",
+ "mirred_action": "redirect",
+ "direction": "ingress",
+ "index": 1,
+ "stats": {
+ "packets": 1
+ },
+ "not_in_hw": true
+ }
+ ]
+ }
+ ],
+ "teardown": [
+ "$TC qdisc del dev $DEV1 clsact",
+ "$TC qdisc del dev $DUMMY clsact"
+ ]
}
-
]
--
2.34.1
next prev parent reply other threads:[~2026-04-26 19:09 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-26 19:09 [PATCH net 0/9] net/sched: Fix packet loops in mirred and netem Jamal Hadi Salim
2026-04-26 19:09 ` [PATCH net 1/9] net: Introduce skb tc depth field to track packet loops Jamal Hadi Salim
2026-04-26 19:09 ` [PATCH net 2/9] net/sched: Revert "net/sched: Restrict conditions for adding duplicating netems to qdisc tree" Jamal Hadi Salim
2026-04-26 19:09 ` [PATCH net 3/9] Revert "selftests/tc-testing: Add tests for restrictions on netem duplication" Jamal Hadi Salim
2026-04-26 19:09 ` [PATCH net 4/9] net/sched: fix packet loop on netem when duplicate is on Jamal Hadi Salim
2026-04-26 19:43 ` William Liu
2026-04-26 19:09 ` [PATCH net 5/9] net/sched: Fix ethx:ingress -> ethy:egress -> ethx:ingress mirred loop Jamal Hadi Salim
2026-04-26 19:09 ` [PATCH net 6/9] net/sched: act_mirred: Fix blockcast recursion bypass leading to stack overflow Jamal Hadi Salim
2026-04-26 19:09 ` [PATCH net 7/9] net/sched: act_mirred: Fix skb leak in early mirred redirect returns Jamal Hadi Salim
2026-04-26 19:09 ` Jamal Hadi Salim [this message]
2026-04-26 19:09 ` [PATCH net 9/9] selftests/tc-testing: Add netem test case exercising loops Jamal Hadi Salim
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