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[BPF] support for policy rules Log action
It is sometimes nice to see whether packets are dropped and which packets are dropped (or accepted) and where. Whenever a packet matches ANY rule with a Log action, the verdict with packet details will be logged to the trace pipe regardless of the bpfLogLevel setting or bpfLogFilters filtering. cali8d1e69e5f89-E: policy ALLOWED proto 17 src 10.65.0.3:46519 dest 172.18.0.6:8055 cali8d1e69e5f89-E: policy ALLOWED proto 6 src 10.65.0.3:36185 dest 10.65.0.2:8055 cali866cd63afec-I: policy ALLOWED proto 6 src 10.65.0.3:36185 dest 10.65.0.2:8055 cali866cd63afec-E: policy ALLOWED proto 6 src 10.65.0.2:43553 dest 10.65.0.3:8055 cali8d1e69e5f89-I: policy DENIED proto 6 src 10.65.0.2:43553 dest 10.65.0.3:8055 cali8d1e69e5f89-E: policy ALLOWED proto 6 src 10.65.0.3:46519 dest 172.18.0.6:8055
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,156 @@ | ||
| // Copyright (c) 2019-2021 Tigera, Inc. All rights reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package ut_test | ||
|
|
||
| import ( | ||
| "net" | ||
| "testing" | ||
|
|
||
| "github.com/google/gopacket/layers" | ||
| . "github.com/onsi/gomega" | ||
|
|
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| "github.com/projectcalico/calico/felix/bpf/polprog" | ||
| "github.com/projectcalico/calico/felix/bpf/routes" | ||
| "github.com/projectcalico/calico/felix/ip" | ||
| "github.com/projectcalico/calico/felix/proto" | ||
| ) | ||
|
|
||
| func TestLog(t *testing.T) { | ||
| RegisterTestingT(t) | ||
|
|
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| defer resetBPFMaps() | ||
| bpfIfaceName = "LOG" | ||
| defer func() { bpfIfaceName = "" }() | ||
|
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| hostIP = node1ip | ||
|
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| _, iphdr, _, _, pktBytes, _ := testPacketUDPDefault() | ||
|
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| resetRTMap(rtMap) | ||
| beV4CIDR := ip.CIDRFromNetIP(iphdr.SrcIP).(ip.V4CIDR) | ||
| bertKey := routes.NewKey(beV4CIDR).AsBytes() | ||
| bertVal := routes.NewValueWithIfIndex(routes.FlagsLocalWorkload|routes.FlagInIPAMPool, 1).AsBytes() | ||
| err := rtMap.Update(bertKey, bertVal) | ||
| Expect(err).NotTo(HaveOccurred()) | ||
|
|
||
| rules := &polprog.Rules{ | ||
| Tiers: []polprog.Tier{{ | ||
| Name: "base tier", | ||
| Policies: []polprog.Policy{ | ||
| { | ||
| Name: "log icmp", | ||
| Rules: []polprog.Rule{ | ||
| { | ||
| Rule: &proto.Rule{ | ||
| Protocol: &proto.Protocol{NumberOrName: &proto.Protocol_Number{Number: 1}}, | ||
| DstNet: []string{"8.8.8.8/32"}, | ||
| Action: "Allow", | ||
| }, | ||
| }, | ||
| { | ||
| Rule: &proto.Rule{ | ||
| Protocol: &proto.Protocol{NumberOrName: &proto.Protocol_Number{Number: 1}}, | ||
| Action: "Log", // Denied by default deny when not matching any rule | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| { | ||
| Name: "log tcp allow", | ||
| Rules: []polprog.Rule{ | ||
| { | ||
| Rule: &proto.Rule{ | ||
| Protocol: &proto.Protocol{NumberOrName: &proto.Protocol_Number{Number: 6}}, | ||
| Action: "Log", | ||
| }, | ||
| }, | ||
| { | ||
| Rule: &proto.Rule{ | ||
| Protocol: &proto.Protocol{NumberOrName: &proto.Protocol_Number{Number: 6}}, | ||
| Action: "Allow", | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| { | ||
| Name: "log udp deny", | ||
| Rules: []polprog.Rule{ | ||
| { | ||
| Rule: &proto.Rule{ | ||
| Protocol: &proto.Protocol{NumberOrName: &proto.Protocol_Number{Number: 17}}, | ||
| Action: "Log", | ||
| }, | ||
| }, | ||
| { | ||
| Rule: &proto.Rule{ | ||
| Protocol: &proto.Protocol{NumberOrName: &proto.Protocol_Number{Number: 17}}, | ||
| Action: "Deny", | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| }}, | ||
| } | ||
|
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| runBpfTest(t, "calico_from_workload_ep", rules, func(bpfrun bpfProgRunFn) { | ||
| res, err := bpfrun(pktBytes) | ||
| Expect(err).NotTo(HaveOccurred()) | ||
| Expect(res.Retval).To(Equal(resTC_ACT_SHOT)) | ||
| }) | ||
|
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| pktIPHdr := *ipv4Default | ||
| pktIPHdr.Protocol = layers.IPProtocolTCP | ||
|
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| pktTCPHdr := &layers.TCP{ | ||
| SrcPort: layers.TCPPort(12345), | ||
| DstPort: layers.TCPPort(321), | ||
| SYN: true, | ||
| DataOffset: 5, | ||
| } | ||
|
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| _, _, _, _, pktBytes, _ = testPacketV4(nil, &pktIPHdr, pktTCPHdr, | ||
| []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 11, 22, 33, 44, 55, 66, 77, 88, 99, 0}) | ||
|
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| skbMark = 0 | ||
|
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| runBpfTest(t, "calico_from_workload_ep", rules, func(bpfrun bpfProgRunFn) { | ||
| res, err := bpfrun(pktBytes) | ||
| Expect(err).NotTo(HaveOccurred()) | ||
| Expect(res.Retval).To(Equal(resTC_ACT_UNSPEC)) | ||
| }) | ||
|
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| pktBytes = makeICMPErrorFrom(ipv4Default.SrcIP, &pktIPHdr, pktTCPHdr, 0, 0) | ||
|
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| skbMark = 0 | ||
|
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| runBpfTest(t, "calico_from_workload_ep", rules, func(bpfrun bpfProgRunFn) { | ||
| res, err := bpfrun(pktBytes) | ||
| Expect(err).NotTo(HaveOccurred()) | ||
| Expect(res.Retval).To(Equal(resTC_ACT_SHOT)) | ||
| }) | ||
|
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| pktIPHdr2 := pktIPHdr | ||
| pktIPHdr2.SrcIP = net.ParseIP("8.8.8.8") | ||
| pktBytes = makeICMPErrorFrom(ipv4Default.SrcIP, &pktIPHdr2, pktTCPHdr, 0, 0) | ||
|
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| skbMark = 0 | ||
|
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| runBpfTest(t, "calico_from_workload_ep", rules, func(bpfrun bpfProgRunFn) { | ||
| res, err := bpfrun(pktBytes) | ||
| Expect(err).NotTo(HaveOccurred()) | ||
| Expect(res.Retval).To(Equal(resTC_ACT_UNSPEC)) | ||
| }) | ||
| } |
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