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selftests/tc-testing: act_ct: add TDC test for skb cb preservation across defrag

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Add a tc-testing case that sends IPv4 fragments through act_ct on clsact
egress while a root prio qdisc is present on the transmit path.

The test verifies that packet processing and qdisc accounting continue
to work after conntrack defragmentation, covering tc_skb_cb preservation
across defragmentation.

Signed-off-by: Zihan Xi <xizh2024@lzu.edu.cn>
Signed-off-by: Ren Wei <n05ec@lzu.edu.cn>
Link: https://patch.msgid.link/53493549fdbcb2de25788b7894c56baadbc5fede.1781358692.git.xizh2024@lzu.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Zihan Xi 2026-06-14 01:42:40 +08:00 committed by Jakub Kicinski
parent 9092e15def
commit 1fd8f80a19
1 changed files with 38 additions and 0 deletions
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38
tools/testing/selftests/tc-testing/tc-tests/actions/ct.json
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@ -664,5 +664,43 @@
"teardown": [
"$TC qdisc del dev $DEV1 ingress_block 21 clsact"
]
},
{
"id": "9c2a",
"name": "Act_ct preserves skb cb across defrag before prio dequeue",
"category": [
"actions",
"ct",
"scapy"
],
"plugins": {
"requires": [
"nsPlugin",
"scapyPlugin"
]
},
"setup": [
"$TC qdisc add dev $DUMMY root handle 1: prio",
"$TC qdisc add dev $DUMMY clsact",
"$TC qdisc add dev $DEV1 clsact",
"$TC filter add dev $DEV1 ingress protocol ip prio 1 matchall action mirred egress redirect dev $DUMMY"
],
"cmdUnderTest": "$TC filter add dev $DUMMY egress protocol ip prio 1 matchall action ct zone 1 pipe",
"scapy": [
{
"iface": "$DEV0",
"count": 1,
"packet": "[Ether()/frag for frag in fragment(IP(src='10.0.0.10', dst='10.0.0.1', id=1)/UDP(sport=12345, dport=9)/Raw(b'A' * 4000), fragsize=1400)]"
}
],
"expExitCode": "0",
"verifyCmd": "$TC -s qdisc show dev $DUMMY | grep -A 1 '^qdisc prio 1:'",
"matchPattern": "Sent [1-9][0-9]* bytes [1-9][0-9]* pkt",
"matchCount": "1",
"teardown": [
"$TC qdisc del dev $DEV1 clsact",
"$TC qdisc del dev $DUMMY clsact",
"$TC qdisc del dev $DUMMY root handle 1:"
]
}
]