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conntrack_test.go
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conntrack_test.go
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//go:build linux
// +build linux
package netlink
import (
"encoding/binary"
"fmt"
"net"
"os"
"runtime"
"testing"
"time"
"github.com/vishvananda/netlink/nl"
"github.com/vishvananda/netns"
"golang.org/x/sys/unix"
)
func CheckErrorFail(t *testing.T, err error) {
if err != nil {
t.Fatalf("Fatal Error: %s", err)
}
}
func CheckError(t *testing.T, err error) {
if err != nil {
t.Errorf("Error: %s", err)
}
}
func udpFlowCreateProg(t *testing.T, flows, srcPort int, dstIP string, dstPort int) {
for i := 0; i < flows; i++ {
ServerAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", dstIP, dstPort))
CheckError(t, err)
LocalAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("127.0.0.1:%d", srcPort+i))
CheckError(t, err)
Conn, err := net.DialUDP("udp", LocalAddr, ServerAddr)
CheckError(t, err)
Conn.Write([]byte("Hello World"))
Conn.Close()
}
}
func nsCreateAndEnter(t *testing.T) (*netns.NsHandle, *netns.NsHandle, *Handle) {
// Lock the OS Thread so we don't accidentally switch namespaces
runtime.LockOSThread()
// Save the current network namespace
origns, _ := netns.Get()
ns, err := netns.New()
CheckErrorFail(t, err)
h, err := NewHandleAt(ns)
CheckErrorFail(t, err)
// Enter the new namespace
netns.Set(ns)
// Bing up loopback
link, _ := h.LinkByName("lo")
h.LinkSetUp(link)
return &origns, &ns, h
}
func applyFilter(flowList []ConntrackFlow, ipv4Filter *ConntrackFilter, ipv6Filter *ConntrackFilter) (ipv4Match, ipv6Match uint) {
for _, flow := range flowList {
if ipv4Filter.MatchConntrackFlow(&flow) == true {
ipv4Match++
}
if ipv6Filter.MatchConntrackFlow(&flow) == true {
ipv6Match++
}
}
return ipv4Match, ipv6Match
}
// TestConntrackSocket test the opening of a NETFILTER family socket
func TestConntrackSocket(t *testing.T) {
skipUnlessRoot(t)
setUpNetlinkTestWithKModule(t, "nf_conntrack")
setUpNetlinkTestWithKModule(t, "nf_conntrack_netlink")
h, err := NewHandle(unix.NETLINK_NETFILTER)
CheckErrorFail(t, err)
if h.SupportsNetlinkFamily(unix.NETLINK_NETFILTER) != true {
t.Fatal("ERROR not supporting the NETFILTER family")
}
}
// TestConntrackTableList test the conntrack table list
// Creates some flows and checks that they are correctly fetched from the conntrack table
func TestConntrackTableList(t *testing.T) {
if os.Getenv("CI") == "true" {
t.Skipf("Fails in CI: Flow creation fails")
}
skipUnlessRoot(t)
k, m, err := KernelVersion()
if err != nil {
t.Fatal(err)
}
// conntrack l3proto was unified since 4.19
// https://github.com/torvalds/linux/commit/a0ae2562c6c4b2721d9fddba63b7286c13517d9f
if k < 4 || k == 4 && m < 19 {
setUpNetlinkTestWithKModule(t, "nf_conntrack_ipv4")
setUpNetlinkTestWithKModule(t, "nf_conntrack_ipv6")
}
setUpNetlinkTestWithKModule(t, "nf_conntrack")
setUpNetlinkTestWithKModule(t, "nf_conntrack_netlink")
// Creates a new namespace and bring up the loopback interface
origns, ns, h := nsCreateAndEnter(t)
defer netns.Set(*origns)
defer origns.Close()
defer ns.Close()
defer runtime.UnlockOSThread()
setUpF(t, "/proc/sys/net/netfilter/nf_conntrack_acct", "1")
setUpF(t, "/proc/sys/net/netfilter/nf_conntrack_timestamp", "1")
setUpF(t, "/proc/sys/net/netfilter/nf_conntrack_udp_timeout", "45")
// Flush the table to start fresh
err = h.ConntrackTableFlush(ConntrackTable)
CheckErrorFail(t, err)
// Create 5 udp
startTime := time.Now()
udpFlowCreateProg(t, 5, 2000, "127.0.0.10", 3000)
// Fetch the conntrack table
flows, err := h.ConntrackTableList(ConntrackTable, unix.AF_INET)
CheckErrorFail(t, err)
// Check that it is able to find the 5 flows created
var found int
for _, flow := range flows {
if flow.Forward.Protocol == 17 &&
flow.Forward.DstIP.Equal(net.ParseIP("127.0.0.10")) &&
flow.Forward.DstPort == 3000 &&
(flow.Forward.SrcPort >= 2000 && flow.Forward.SrcPort <= 2005) {
found++
flowStart := time.Unix(0, int64(flow.TimeStart))
if flowStart.Before(startTime) || flowStart.Sub(startTime) > time.Second {
t.Error("Invalid conntrack entry start timestamp")
}
if flow.TimeStop != 0 {
t.Error("Invalid conntrack entry stop timestamp")
}
// Expect at most one second to have already passed from the configured UDP timeout of 45secs.
if flow.TimeOut < 44 || flow.TimeOut > 45 {
t.Error("Invalid conntrack entry timeout")
}
}
if flow.Forward.Bytes == 0 && flow.Forward.Packets == 0 && flow.Reverse.Bytes == 0 && flow.Reverse.Packets == 0 {
t.Error("No traffic statistics are collected")
}
}
if found != 5 {
t.Fatalf("Found only %d flows over 5", found)
}
// Give a try also to the IPv6 version
_, err = h.ConntrackTableList(ConntrackTable, unix.AF_INET6)
CheckErrorFail(t, err)
// Switch back to the original namespace
netns.Set(*origns)
}
// TestConntrackTableFlush test the conntrack table flushing
// Creates some flows and then call the table flush
func TestConntrackTableFlush(t *testing.T) {
if os.Getenv("CI") == "true" {
t.Skipf("Fails in CI: Flow creation fails")
}
skipUnlessRoot(t)
setUpNetlinkTestWithKModule(t, "nf_conntrack")
setUpNetlinkTestWithKModule(t, "nf_conntrack_netlink")
k, m, err := KernelVersion()
if err != nil {
t.Fatal(err)
}
// conntrack l3proto was unified since 4.19
// https://github.com/torvalds/linux/commit/a0ae2562c6c4b2721d9fddba63b7286c13517d9f
if k < 4 || k == 4 && m < 19 {
setUpNetlinkTestWithKModule(t, "nf_conntrack_ipv4")
}
setUpNetlinkTestWithKModule(t, "nf_conntrack")
// Creates a new namespace and bring up the loopback interface
origns, ns, h := nsCreateAndEnter(t)
defer netns.Set(*origns)
defer origns.Close()
defer ns.Close()
defer runtime.UnlockOSThread()
// Create 5 udp flows using netcat
udpFlowCreateProg(t, 5, 3000, "127.0.0.10", 4000)
// Fetch the conntrack table
flows, err := h.ConntrackTableList(ConntrackTable, unix.AF_INET)
CheckErrorFail(t, err)
// Check that it is able to find the 5 flows created
var found int
for _, flow := range flows {
if flow.Forward.Protocol == 17 &&
flow.Forward.DstIP.Equal(net.ParseIP("127.0.0.10")) &&
flow.Forward.DstPort == 4000 &&
(flow.Forward.SrcPort >= 3000 && flow.Forward.SrcPort <= 3005) {
found++
}
}
if found != 5 {
t.Fatalf("Found only %d flows over 5", found)
}
// Flush the table
err = h.ConntrackTableFlush(ConntrackTable)
CheckErrorFail(t, err)
// Fetch again the flows to validate the flush
flows, err = h.ConntrackTableList(ConntrackTable, unix.AF_INET)
CheckErrorFail(t, err)
// Check if it is still able to find the 5 flows created
found = 0
for _, flow := range flows {
if flow.Forward.Protocol == 17 &&
flow.Forward.DstIP.Equal(net.ParseIP("127.0.0.10")) &&
flow.Forward.DstPort == 4000 &&
(flow.Forward.SrcPort >= 3000 && flow.Forward.SrcPort <= 3005) {
found++
}
}
if found > 0 {
t.Fatalf("Found %d flows, they should had been flushed", found)
}
// Switch back to the original namespace
netns.Set(*origns)
}
// TestConntrackTableDelete tests the deletion with filter
// Creates 2 group of flows then deletes only one group and validates the result
func TestConntrackTableDelete(t *testing.T) {
if os.Getenv("CI") == "true" {
t.Skipf("Fails in CI: Flow creation fails")
}
skipUnlessRoot(t)
requiredModules := []string{"nf_conntrack", "nf_conntrack_netlink"}
k, m, err := KernelVersion()
if err != nil {
t.Fatal(err)
}
// conntrack l3proto was unified since 4.19
// https://github.com/torvalds/linux/commit/a0ae2562c6c4b2721d9fddba63b7286c13517d9f
if k < 4 || k == 4 && m < 19 {
requiredModules = append(requiredModules, "nf_conntrack_ipv4")
}
setUpNetlinkTestWithKModule(t, requiredModules...)
// Creates a new namespace and bring up the loopback interface
origns, ns, h := nsCreateAndEnter(t)
defer netns.Set(*origns)
defer origns.Close()
defer ns.Close()
defer runtime.UnlockOSThread()
// Create 10 udp flows
udpFlowCreateProg(t, 5, 5000, "127.0.0.10", 6000)
udpFlowCreateProg(t, 5, 7000, "127.0.0.20", 8000)
// Fetch the conntrack table
flows, err := h.ConntrackTableList(ConntrackTable, unix.AF_INET)
CheckErrorFail(t, err)
// Check that it is able to find the 5 flows created for each group
var groupA int
var groupB int
for _, flow := range flows {
if flow.Forward.Protocol == 17 &&
flow.Forward.DstIP.Equal(net.ParseIP("127.0.0.10")) &&
flow.Forward.DstPort == 6000 &&
(flow.Forward.SrcPort >= 5000 && flow.Forward.SrcPort <= 5005) {
groupA++
}
if flow.Forward.Protocol == 17 &&
flow.Forward.DstIP.Equal(net.ParseIP("127.0.0.20")) &&
flow.Forward.DstPort == 8000 &&
(flow.Forward.SrcPort >= 7000 && flow.Forward.SrcPort <= 7005) {
groupB++
}
}
if groupA != 5 || groupB != 5 {
t.Fatalf("Flow creation issue groupA:%d, groupB:%d", groupA, groupB)
}
// Create a filter to erase groupB flows
filter := &ConntrackFilter{}
filter.AddIP(ConntrackOrigDstIP, net.ParseIP("127.0.0.20"))
filter.AddProtocol(17)
filter.AddPort(ConntrackOrigDstPort, 8000)
// Flush entries of groupB
var deleted uint
if deleted, err = h.ConntrackDeleteFilter(ConntrackTable, unix.AF_INET, filter); err != nil {
t.Fatalf("Error during the erase: %s", err)
}
if deleted != 5 {
t.Fatalf("Error deleted a wrong number of flows:%d instead of 5", deleted)
}
// Check again the table to verify that are gone
flows, err = h.ConntrackTableList(ConntrackTable, unix.AF_INET)
CheckErrorFail(t, err)
// Check if it is able to find the 5 flows of groupA but none of groupB
groupA = 0
groupB = 0
for _, flow := range flows {
if flow.Forward.Protocol == 17 &&
flow.Forward.DstIP.Equal(net.ParseIP("127.0.0.10")) &&
flow.Forward.DstPort == 6000 &&
(flow.Forward.SrcPort >= 5000 && flow.Forward.SrcPort <= 5005) {
groupA++
}
if flow.Forward.Protocol == 17 &&
flow.Forward.DstIP.Equal(net.ParseIP("127.0.0.20")) &&
flow.Forward.DstPort == 8000 &&
(flow.Forward.SrcPort >= 7000 && flow.Forward.SrcPort <= 7005) {
groupB++
}
}
if groupA != 5 || groupB > 0 {
t.Fatalf("Error during the erase groupA:%d, groupB:%d", groupA, groupB)
}
// Switch back to the original namespace
netns.Set(*origns)
}
func TestConntrackFilter(t *testing.T) {
var flowList []ConntrackFlow
flowList = append(flowList, ConntrackFlow{
FamilyType: unix.AF_INET,
Forward: IPTuple{
SrcIP: net.ParseIP("10.0.0.1"),
DstIP: net.ParseIP("20.0.0.1"),
SrcPort: 1000,
DstPort: 2000,
Protocol: 17,
},
Reverse: IPTuple{
SrcIP: net.ParseIP("20.0.0.1"),
DstIP: net.ParseIP("192.168.1.1"),
SrcPort: 2000,
DstPort: 1000,
Protocol: 17,
},
},
ConntrackFlow{
FamilyType: unix.AF_INET,
Forward: IPTuple{
SrcIP: net.ParseIP("10.0.0.2"),
DstIP: net.ParseIP("20.0.0.2"),
SrcPort: 5000,
DstPort: 6000,
Protocol: 6,
},
Reverse: IPTuple{
SrcIP: net.ParseIP("20.0.0.2"),
DstIP: net.ParseIP("192.168.1.1"),
SrcPort: 6000,
DstPort: 5000,
Protocol: 6,
},
Labels: []byte{0, 0, 0, 0, 3, 4, 61, 141, 207, 170, 2, 0, 0, 0, 0, 0},
Zone: 200,
},
ConntrackFlow{
FamilyType: unix.AF_INET6,
Forward: IPTuple{
SrcIP: net.ParseIP("eeee:eeee:eeee:eeee:eeee:eeee:eeee:eeee"),
DstIP: net.ParseIP("dddd:dddd:dddd:dddd:dddd:dddd:dddd:dddd"),
SrcPort: 1000,
DstPort: 2000,
Protocol: 132,
},
Reverse: IPTuple{
SrcIP: net.ParseIP("dddd:dddd:dddd:dddd:dddd:dddd:dddd:dddd"),
DstIP: net.ParseIP("eeee:eeee:eeee:eeee:eeee:eeee:eeee:eeee"),
SrcPort: 2000,
DstPort: 1000,
Protocol: 132,
},
Zone: 200,
})
// Empty filter
v4Match, v6Match := applyFilter(flowList, &ConntrackFilter{}, &ConntrackFilter{})
if v4Match > 0 || v6Match > 0 {
t.Fatalf("Error, empty filter cannot match, v4:%d, v6:%d", v4Match, v6Match)
}
// Filter errors
// Adding same attribute should fail
filter := &ConntrackFilter{}
err := filter.AddIP(ConntrackOrigSrcIP, net.ParseIP("10.0.0.1"))
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
if err := filter.AddIP(ConntrackOrigSrcIP, net.ParseIP("10.0.0.1")); err == nil {
t.Fatalf("Error, it should fail adding same attribute to the filter")
}
err = filter.AddProtocol(6)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
if err := filter.AddProtocol(17); err == nil {
t.Fatalf("Error, it should fail adding same attribute to the filter")
}
filter.AddPort(ConntrackOrigSrcPort, 80)
if err := filter.AddPort(ConntrackOrigSrcPort, 80); err == nil {
t.Fatalf("Error, it should fail adding same attribute to the filter")
}
// Can not add a Port filter without Layer 4 protocol
filter = &ConntrackFilter{}
if err := filter.AddPort(ConntrackOrigSrcPort, 80); err == nil {
t.Fatalf("Error, it should fail adding a port filter without a protocol")
}
// Can not add a Port filter if the Layer 4 protocol does not support it
filter = &ConntrackFilter{}
err = filter.AddProtocol(47)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
if err := filter.AddPort(ConntrackOrigSrcPort, 80); err == nil {
t.Fatalf("Error, it should fail adding a port filter with a wrong protocol")
}
// Proto filter
filterV4 := &ConntrackFilter{}
err = filterV4.AddProtocol(6)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
filterV6 := &ConntrackFilter{}
err = filterV6.AddProtocol(132)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
if v4Match != 1 || v6Match != 1 {
t.Fatalf("Error, there should be only 1 match for TCP:%d, UDP:%d", v4Match, v6Match)
}
// SrcIP filter
filterV4 = &ConntrackFilter{}
err = filterV4.AddIP(ConntrackOrigSrcIP, net.ParseIP("10.0.0.1"))
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
filterV6 = &ConntrackFilter{}
err = filterV6.AddIP(ConntrackOrigSrcIP, net.ParseIP("eeee:eeee:eeee:eeee:eeee:eeee:eeee:eeee"))
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
if v4Match != 1 || v6Match != 1 {
t.Fatalf("Error, there should be only 1 match, v4:%d, v6:%d", v4Match, v6Match)
}
// DstIp filter
filterV4 = &ConntrackFilter{}
err = filterV4.AddIP(ConntrackOrigDstIP, net.ParseIP("20.0.0.1"))
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
filterV6 = &ConntrackFilter{}
err = filterV6.AddIP(ConntrackOrigDstIP, net.ParseIP("dddd:dddd:dddd:dddd:dddd:dddd:dddd:dddd"))
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
if v4Match != 1 || v6Match != 1 {
t.Fatalf("Error, there should be only 1 match, v4:%d, v6:%d", v4Match, v6Match)
}
// SrcIP for NAT
filterV4 = &ConntrackFilter{}
err = filterV4.AddIP(ConntrackReplySrcIP, net.ParseIP("20.0.0.1"))
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
filterV6 = &ConntrackFilter{}
err = filterV6.AddIP(ConntrackReplySrcIP, net.ParseIP("dddd:dddd:dddd:dddd:dddd:dddd:dddd:dddd"))
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
if v4Match != 1 || v6Match != 1 {
t.Fatalf("Error, there should be only 1 match, v4:%d, v6:%d", v4Match, v6Match)
}
// DstIP for NAT
filterV4 = &ConntrackFilter{}
err = filterV4.AddIP(ConntrackReplyDstIP, net.ParseIP("192.168.1.1"))
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
filterV6 = &ConntrackFilter{}
err = filterV6.AddIP(ConntrackReplyDstIP, net.ParseIP("dddd:dddd:dddd:dddd:dddd:dddd:dddd:dddd"))
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
if v4Match != 2 || v6Match != 0 {
t.Fatalf("Error, there should be an exact match, v4:%d, v6:%d", v4Match, v6Match)
}
// AnyIp for Nat
filterV4 = &ConntrackFilter{}
err = filterV4.AddIP(ConntrackReplyAnyIP, net.ParseIP("192.168.1.1"))
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
filterV6 = &ConntrackFilter{}
err = filterV6.AddIP(ConntrackReplyAnyIP, net.ParseIP("eeee:eeee:eeee:eeee:eeee:eeee:eeee:eeee"))
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
if v4Match != 2 || v6Match != 1 {
t.Fatalf("Error, there should be an exact match, v4:%d, v6:%d", v4Match, v6Match)
}
// SrcIPNet filter
filterV4 = &ConntrackFilter{}
ipNet, err := ParseIPNet("10.0.0.0/12")
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
err = filterV4.AddIPNet(ConntrackOrigSrcIP, ipNet)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
filterV6 = &ConntrackFilter{}
ipNet, err = ParseIPNet("eeee:eeee:eeee:eeee::/64")
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
err = filterV6.AddIPNet(ConntrackOrigSrcIP, ipNet)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
if v4Match != 2 || v6Match != 1 {
t.Fatalf("Error, there should be only 1 match, v4:%d, v6:%d", v4Match, v6Match)
}
// DstIpNet filter
filterV4 = &ConntrackFilter{}
ipNet, err = ParseIPNet("20.0.0.0/12")
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
err = filterV4.AddIPNet(ConntrackOrigDstIP, ipNet)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
filterV6 = &ConntrackFilter{}
ipNet, err = ParseIPNet("dddd:dddd:dddd:dddd::/64")
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
err = filterV6.AddIPNet(ConntrackOrigDstIP, ipNet)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
if v4Match != 2 || v6Match != 1 {
t.Fatalf("Error, there should be only 1 match, v4:%d, v6:%d", v4Match, v6Match)
}
// SrcIPNet for NAT
filterV4 = &ConntrackFilter{}
ipNet, err = ParseIPNet("20.0.0.0/12")
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
err = filterV4.AddIPNet(ConntrackReplySrcIP, ipNet)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
filterV6 = &ConntrackFilter{}
ipNet, err = ParseIPNet("dddd:dddd:dddd:dddd::/64")
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
err = filterV6.AddIPNet(ConntrackReplySrcIP, ipNet)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
if v4Match != 2 || v6Match != 1 {
t.Fatalf("Error, there should be only 1 match, v4:%d, v6:%d", v4Match, v6Match)
}
// DstIPNet for NAT
filterV4 = &ConntrackFilter{}
ipNet, err = ParseIPNet("192.168.0.0/12")
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
err = filterV4.AddIPNet(ConntrackReplyDstIP, ipNet)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
filterV6 = &ConntrackFilter{}
ipNet, err = ParseIPNet("dddd:dddd:dddd:dddd::/64")
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
err = filterV6.AddIPNet(ConntrackReplyDstIP, ipNet)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
if v4Match != 2 || v6Match != 0 {
t.Fatalf("Error, there should be an exact match, v4:%d, v6:%d", v4Match, v6Match)
}
// AnyIpNet for Nat
filterV4 = &ConntrackFilter{}
ipNet, err = ParseIPNet("192.168.0.0/12")
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
err = filterV4.AddIPNet(ConntrackReplyAnyIP, ipNet)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
filterV6 = &ConntrackFilter{}
ipNet, err = ParseIPNet("eeee:eeee:eeee:eeee::/64")
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
err = filterV6.AddIPNet(ConntrackReplyAnyIP, ipNet)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
if v4Match != 2 || v6Match != 1 {
t.Fatalf("Error, there should be an exact match, v4:%d, v6:%d", v4Match, v6Match)
}
// SrcPort filter
filterV4 = &ConntrackFilter{}
err = filterV4.AddProtocol(6)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
err = filterV4.AddPort(ConntrackOrigSrcPort, 5000)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
filterV6 = &ConntrackFilter{}
err = filterV6.AddProtocol(132)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
err = filterV6.AddPort(ConntrackOrigSrcPort, 1000)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
if v4Match != 1 || v6Match != 1 {
t.Fatalf("Error, there should be only 1 match, v4:%d, v6:%d", v4Match, v6Match)
}
// DstPort filter
filterV4 = &ConntrackFilter{}
err = filterV4.AddProtocol(6)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
err = filterV4.AddPort(ConntrackOrigDstPort, 6000)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
filterV6 = &ConntrackFilter{}
err = filterV6.AddProtocol(132)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
err = filterV6.AddPort(ConntrackOrigDstPort, 2000)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
if v4Match != 1 || v6Match != 1 {
t.Fatalf("Error, there should be only 1 match, v4:%d, v6:%d", v4Match, v6Match)
}
// Labels filter
filterV4 = &ConntrackFilter{}
var labels [][]byte
labels = append(labels, []byte{3, 4, 61, 141, 207, 170})
labels = append(labels, []byte{0x2})
err = filterV4.AddLabels(ConntrackMatchLabels, labels)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
filterV6 = &ConntrackFilter{}
err = filterV6.AddLabels(ConntrackUnmatchLabels, labels)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
if v4Match != 1 || v6Match != 0 {
t.Fatalf("Error, there should be only 1 match, v4:%d, v6:%d", v4Match, v6Match)
}
filterV4 = &ConntrackFilter{}
err = filterV4.AddZone(200)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
filterV6 = &ConntrackFilter{}
v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
if v4Match != 2 || v6Match != 0 {
t.Fatalf("Error, there should be only 1 match, v4:%d, v6:%d", v4Match, v6Match)
}
}
func TestParseRawData(t *testing.T) {
if nl.NativeEndian() == binary.BigEndian {
t.Skip("testdata expect little-endian test executor")
}
os.Setenv("TZ", "") // print timestamps in UTC
tests := []struct {
testname string
rawData []byte
expConntrackFlow string
}{
{
testname: "UDP conntrack",
rawData: []byte{
/* Nfgenmsg header */
2, 0, 0, 0,
/* >> nested CTA_TUPLE_ORIG */
52, 0, 1, 128,
/* >>>> nested CTA_TUPLE_IP */
20, 0, 1, 128,
/* >>>>>> CTA_IP_V4_SRC */
8, 0, 1, 0,
192, 168, 0, 10,
/* >>>>>> CTA_IP_V4_DST */
8, 0, 2, 0,
192, 168, 0, 3,
/* >>>>>> nested proto info */
28, 0, 2, 128,
/* >>>>>>>> CTA_PROTO_NUM */
5, 0, 1, 0,
17, 0, 0, 0,
/* >>>>>>>> CTA_PROTO_SRC_PORT */
6, 0, 2, 0,
189, 1, 0, 0,
/* >>>>>>>> CTA_PROTO_DST_PORT */
6, 0, 3, 0,
0, 53, 0, 0,
/* >> CTA_TUPLE_REPLY */
52, 0, 2, 128,
/* >>>> nested CTA_TUPLE_IP */
20, 0, 1, 128,
/* >>>>>> CTA_IP_V4_SRC */
8, 0, 1, 0,
192, 168, 0, 3,
/* >>>>>> CTA_IP_V4_DST */
8, 0, 2, 0,
192, 168, 0, 10,
/* >>>>>> nested proto info */
28, 0, 2, 128,
/* >>>>>>>> CTA_PROTO_NUM */
5, 0, 1, 0,
17, 0, 0, 0,
/* >>>>>>>> CTA_PROTO_SRC_PORT */
6, 0, 2, 0,
0, 53, 0, 0,
/* >>>>>>>> CTA_PROTO_DST_PORT */
6, 0, 3, 0,
189, 1, 0, 0,
/* >> CTA_STATUS */
8, 0, 3, 0,
0, 0, 1, 138,
/* >> CTA_MARK */
8, 0, 8, 0,
0, 0, 0, 5,
/* >> CTA_ID */
8, 0, 12, 0,
81, 172, 253, 151,
/* >> CTA_USE */
8, 0, 11, 0,
0, 0, 0, 1,
/* >> CTA_TIMEOUT */
8, 0, 7, 0,
0, 0, 0, 32,
/* >> nested CTA_COUNTERS_ORIG */
28, 0, 9, 128,
/* >>>> CTA_COUNTERS_PACKETS */
12, 0, 1, 0,
0, 0, 0, 0, 0, 0, 0, 1,
/* >>>> CTA_COUNTERS_BYTES */
12, 0, 2, 0,
0, 0, 0, 0, 0, 0, 0, 55,
/* >> nested CTA_COUNTERS_REPLY */
28, 0, 10, 128,
/* >>>> CTA_COUNTERS_PACKETS */
12, 0, 1, 0,
0, 0, 0, 0, 0, 0, 0, 1,
/* >>>> CTA_COUNTERS_BYTES */
12, 0, 2, 0,
0, 0, 0, 0, 0, 0, 0, 71,
/* >> nested CTA_TIMESTAMP */
16, 0, 20, 128,
/* >>>> CTA_TIMESTAMP_START */
12, 0, 1, 0,
22, 134, 80, 142, 230, 127, 74, 166,
/* >> CTA_LABELS */
20, 0, 22, 0,
0, 0, 0, 0, 5, 0, 18, 172, 66, 2, 1, 0, 0, 0, 0, 0},
expConntrackFlow: "udp\t17 src=192.168.0.10 dst=192.168.0.3 sport=48385 dport=53 packets=1 bytes=55\t" +
"src=192.168.0.3 dst=192.168.0.10 sport=53 dport=48385 packets=1 bytes=71 mark=0x5 labels=0x00000000050012ac4202010000000000 " +
"start=2021-06-07 13:41:30.39632247 +0000 UTC stop=1970-01-01 00:00:00 +0000 UTC timeout=32(sec)",
},
{
testname: "TCP conntrack",
rawData: []byte{
/* Nfgenmsg header */
2, 0, 0, 0,
/* >> nested CTA_TUPLE_ORIG */
52, 0, 1, 128,
/* >>>> nested CTA_TUPLE_IP */
20, 0, 1, 128,
/* >>>>>> CTA_IP_V4_SRC */
8, 0, 1, 0,
192, 168, 0, 10,
/* >>>>>> CTA_IP_V4_DST */
8, 0, 2, 0,
192, 168, 77, 73,
/* >>>>>> nested proto info */
28, 0, 2, 128,
/* >>>>>>>> CTA_PROTO_NUM */
5, 0, 1, 0,
6, 0, 0, 0,
/* >>>>>>>> CTA_PROTO_SRC_PORT */
6, 0, 2, 0,
166, 129, 0, 0,
/* >>>>>>>> CTA_PROTO_DST_PORT */
6, 0, 3, 0,
13, 5, 0, 0,
/* >> CTA_TUPLE_REPLY */
52, 0, 2, 128,
/* >>>> nested CTA_TUPLE_IP */
20, 0, 1, 128,
/* >>>>>> CTA_IP_V4_SRC */
8, 0, 1, 0,
192, 168, 77, 73,
/* >>>>>> CTA_IP_V4_DST */
8, 0, 2, 0,
192, 168, 0, 10,
/* >>>>>> nested proto info */
28, 0, 2, 128,
/* >>>>>>>> CTA_PROTO_NUM */
5, 0, 1, 0,
6, 0, 0, 0,
/* >>>>>>>> CTA_PROTO_SRC_PORT */
6, 0, 2, 0,
13, 5, 0, 0,
/* >>>>>>>> CTA_PROTO_DST_PORT */
6, 0, 3, 0,
166, 129, 0, 0,
/* >> CTA_STATUS */
8, 0, 3, 0,
0, 0, 1, 142,
/* >> CTA_MARK */
8, 0, 8, 0,
0, 0, 0, 5,
/* >> CTA_ID */
8, 0, 12, 0,
177, 65, 179, 133,
/* >> CTA_USE */
8, 0, 11, 0,
0, 0, 0, 1,
/* >> CTA_TIMEOUT */
8, 0, 7, 0,
0, 0, 0, 152,
/* >> CTA_PROTOINFO */
48, 0, 4, 128,
44, 0, 1, 128,
5, 0, 1, 0, 8, 0, 0, 0,
5, 0, 2, 0, 0, 0, 0, 0,
5, 0, 3, 0, 0, 0, 0, 0,
6, 0, 4, 0, 39, 0, 0, 0,
6, 0, 5, 0, 32, 0, 0, 0,
/* >> nested CTA_COUNTERS_ORIG */
28, 0, 9, 128,
/* >>>> CTA_COUNTERS_PACKETS */
12, 0, 1, 0,
0, 0, 0, 0, 0, 0, 0, 11,
/* >>>> CTA_COUNTERS_BYTES */
12, 0, 2, 0,
0, 0, 0, 0, 0, 0, 7, 122,
/* >> nested CTA_COUNTERS_REPLY */
28, 0, 10, 128,
/* >>>> CTA_COUNTERS_PACKETS */
12, 0, 1, 0,
0, 0, 0, 0, 0, 0, 0, 10,
/* >>>> CTA_COUNTERS_BYTES */
12, 0, 2, 0,
0, 0, 0, 0, 0, 0, 7, 66,
/* >> CTA_ZONE */
8, 0, 18, 0,
0, 100, 0, 0,
/* >> nested CTA_TIMESTAMP */
16, 0, 20, 128,
/* >>>> CTA_TIMESTAMP_START */
12, 0, 1, 0,
22, 134, 80, 175, 134, 10, 182, 221},
expConntrackFlow: "tcp\t6 src=192.168.0.10 dst=192.168.77.73 sport=42625 dport=3333 packets=11 bytes=1914\t" +
"src=192.168.77.73 dst=192.168.0.10 sport=3333 dport=42625 packets=10 bytes=1858 mark=0x5 zone=100 " +
"start=2021-06-07 13:43:50.511990493 +0000 UTC stop=1970-01-01 00:00:00 +0000 UTC timeout=152(sec)",
},
}
for _, test := range tests {
t.Run(test.testname, func(t *testing.T) {
conntrackFlow := parseRawData(test.rawData)
if conntrackFlow.String() != test.expConntrackFlow {
t.Errorf("expected conntrack flow:\n\t%q\ngot conntrack flow:\n\t%q",
test.expConntrackFlow, conntrackFlow)
}
})
}
}
// TestConntrackUpdateV4 first tries to update a non-existant IPv4 conntrack and asserts that an error occurs.
// It then creates a conntrack entry using and adjacent API method (ConntrackCreate), and attempts to update the value of the created conntrack.
func TestConntrackUpdateV4(t *testing.T) {
// Print timestamps in UTC
os.Setenv("TZ", "")
requiredModules := []string{"nf_conntrack", "nf_conntrack_netlink"}
k, m, err := KernelVersion()
if err != nil {
t.Fatal(err)
}
// Conntrack l3proto was unified since 4.19
// https://github.com/torvalds/linux/commit/a0ae2562c6c4b2721d9fddba63b7286c13517d9f
if k < 4 || k == 4 && m < 19 {
requiredModules = append(requiredModules, "nf_conntrack_ipv4")
}