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tc-testing: add test for ct DNAT tuple collision

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When this test fails, /proc/net/nf_conntrack gets only 1 entry:
ipv4     2 tcp      6 119 SYN_SENT src=10.0.0.10 dst=10.0.0.10 sport=5000 dport=10 [UNREPLIED] src=20.0.0.1 dst=10.0.0.10 sport=10 dport=5000 mark=0 secctx=system_u:object_r:unlabeled_t:s0 zone=0 use=2

When it works, it gets 2 entries:
ipv4     2 tcp      6 119 SYN_SENT src=10.0.0.10 dst=10.0.0.20 sport=5000 dport=10 [UNREPLIED] src=20.0.0.1 dst=10.0.0.10 sport=10 dport=58203 mark=0 secctx=system_u:object_r:unlabeled_t:s0 zone=0 use=2
ipv4     2 tcp      6 119 SYN_SENT src=10.0.0.10 dst=10.0.0.10 sport=5000 dport=10 [UNREPLIED] src=20.0.0.1 dst=10.0.0.10 sport=10 dport=5000 mark=0 secctx=system_u:object_r:unlabeled_t:s0 zone=0 use=2

The missing entry is because the 2nd packet hits a tuple collusion and the
conntrack entry doesn't get allocated.

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marcelo Ricardo Leitner 2021-06-22 12:05:02 -03:00 committed by David S. Miller
parent 11f04de902
commit e469056413
1 changed files with 45 additions and 0 deletions
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45
tools/testing/selftests/tc-testing/tc-tests/actions/ct.json
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@ -406,5 +406,50 @@
"teardown": [
"$TC actions flush action ct"
]
},
{
"id": "3992",
"name": "Add ct action triggering DNAT tuple conflict",
"category": [
"actions",
"ct",
"scapy"
],
"plugins": {
"requires": [
"nsPlugin",
"scapyPlugin"
]
},
"setup": [
[
"$TC qdisc del dev $DEV1 ingress",
0,
1,
2,
255
],
"$TC qdisc add dev $DEV1 ingress"
],
"cmdUnderTest": "$TC filter add dev $DEV1 ingress protocol ip prio 1 flower ct_state -trk action ct commit nat dst addr 20.0.0.1 port 10 pipe action drop",
"scapy": [
{
"iface": "$DEV0",
"count": 1,
"packet": "Ether(type=0x800)/IP(src='10.0.0.10',dst='10.0.0.10')/TCP(sport=5000,dport=10)"
},
{
"iface": "$DEV0",
"count": 1,
"packet": "Ether(type=0x800)/IP(src='10.0.0.10',dst='10.0.0.20')/TCP(sport=5000,dport=10)"
}
],
"expExitCode": "0",
"verifyCmd": "cat /proc/net/nf_conntrack",
"matchPattern": "dst=10.0.0.20",
"matchCount": "1",
"teardown": [
"$TC qdisc del dev $DEV1 ingress"
]
}
]