check bpf progs after tests finish - expect they have not leaked any progs

Author: aaaaaaaalex

felix/fv/bpf_test.go

@@ -305,6 +305,7 @@ func describeBPFTests(opts ...bpfTestOpt) bool {
 			numericProto   uint8
 		)
 
+		leftoverBPFProgsByFelix := make([]map[string]any, 3)
 		containerIP := func(c *containers.Container) string {
 			if testOpts.ipv6 {
 				return c.IPv6
@@ -450,6 +451,19 @@ func describeBPFTests(opts ...bpfTestOpt) bool {
 		})
 
 		JustAfterEach(func() {
+			for i := range tc.Felixes {
+				prev := leftoverBPFProgsByFelix[i]
+
+				cur, _ := tc.Felixes[i].ExecOutput("bpftool", "-jp", "prog", "show")
+				curUnmarshalled := make(map[string]any)
+				json.Unmarshal([]byte(cur), &curUnmarshalled)
+
+				if prev != nil {
+					Expect(prev).To(BeEquivalentTo(curUnmarshalled))
+				}
+				leftoverBPFProgsByFelix[i] = curUnmarshalled
+			}
+
 			if CurrentGinkgoTestDescription().Failed {
 				var (
 					currBpfsvcs   []nat.MapMem