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fix for 498147479 PF-1.4 ip_guev1_static_decap_subnet_range #5437

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fix for 498147479 PF-1.4 ip_guev1_static_decap_subnet_range #5437

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ea6b6dc
fix for 498147479 (Arista Failing FNT: feature/policy_forwarding/deca…
mihaitomaro May 8, 2026
3dae7cd
Merge branch 'main' into fix498147479
mihaitomaro May 8, 2026
85e7527
Merge branch 'main' into fix498147479
mihaitomaro May 13, 2026
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41 changes: 38 additions & 3 deletions ...n/otg_tests/ip_guev1_static_decap_subnet_range/ip_guev1_static_decap_subnet_range_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -482,7 +482,13 @@ func gueDecapInnerIpv4Traffic(t *testing.T, dut *ondatra.DUTDevice, ate *ondatra
stopCapture(t, ate)
if trafficValidation {
verifyTrafficFlow(t, ate, trafficID, true)
verifyCaptureDscpTtlValue(t, ate, "port2", int(innerDscpValue), int(innerTTL-1))
if verifyCounters {
// PF-1.4.1 / PF-1.4.2: decapsulate — verify inner DSCP and TTL
verifyCaptureDscpTtlValue(t, ate, "port2", int(innerDscpValue), int(innerTTL-1))
} else {
// PF-1.4.5 / PF-1.4.6: pass-through — verify outer packet unmodified (no decap)
verifyPassThroughGuePacket(t, ate, "port2")
}
} else {
verifyTrafficFlow(t, ate, trafficID, false)
}
Expand All @@ -501,7 +507,13 @@ func gueDecapInnerIpv6Traffic(t *testing.T, dut *ondatra.DUTDevice, ate *ondatra
stopCapture(t, ate)
if trafficValidation {
verifyTrafficFlow(t, ate, trafficID, true)
verifyCaptureDscpTtlValue(t, ate, "port2", int(innerDscpValue), int(innerTTL-1))
if verifyCounters {
// PF-1.4.1 / PF-1.4.2: decapsulate — verify inner DSCP and TTL
verifyCaptureDscpTtlValue(t, ate, "port2", int(innerDscpValue), int(innerTTL-1))
} else {
// PF-1.4.5 / PF-1.4.6: pass-through — verify outer packet unmodified (no decap)
verifyPassThroughGuePacket(t, ate, "port2")
}
} else {
verifyTrafficFlow(t, ate, trafficID, false)
}
Expand Down Expand Up @@ -613,7 +625,7 @@ func verifyCaptureDscpTtlValue(t *testing.T, ate *ondatra.ATEDevice, port string
if ip6Layer := packet.Layer(layers.LayerTypeIPv6); ip6Layer != nil {
ip6, _ := ip6Layer.(*layers.IPv6)
if ip6.SrcIP.Equal(net.ParseIP(ipv6Src)) {
dscpValue := ip6.TrafficClass >> 2
dscpValue := ip6.TrafficClass
ttlVal := ip6.HopLimit
if int(dscpValue) == dscp && int(ttlVal) == ttl {
t.Logf("PASS: IPv6 DSCP value %v and TTL value %v are Preserved", dscp, ttl)
Expand Down Expand Up @@ -657,3 +669,26 @@ func waitForBGPSession(t *testing.T, dut *ondatra.DUTDevice, wantEstablished boo
}
}
}
func verifyPassThroughGuePacket(t *testing.T, ate *ondatra.ATEDevice, port string) {
pcapfilename := processCapture(t, ate, port)
handle, err := pcap.OpenOffline(pcapfilename)
if err != nil {
t.Fatal(err)
}
defer handle.Close()
packetSource := gopacket.NewPacketSource(handle, handle.LinkType())
for packet := range packetSource.Packets() {
if ip6Layer := packet.Layer(layers.LayerTypeIPv6); ip6Layer != nil {
ip6, _ := ip6Layer.(*layers.IPv6)
if ip6.SrcIP.Equal(net.ParseIP(atePort1.IPv6)) {
expectedTTL := uint8(outerTTL - 1)
if ip6.HopLimit == expectedTTL {
t.Logf("PASS: GUE pass-through packet verified: outer src=%s, TTL=%d (decremented by 1)", atePort1.IPv6, ip6.HopLimit)
return
}
t.Fatalf("ERROR: Outer TTL mismatch in pass-through. Expected: %d, Got: %d", expectedTTL, ip6.HopLimit)
}
}
}
t.Fatalf("ERROR: Could not find GUE pass-through packet with outer src IP (%s) in capture", atePort1.IPv6)
}
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