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kube-proxy: internal config: fuzz cidr values for unit tests

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Signed-off-by: Daman Arora <aroradaman@gmail.com>
This commit is contained in:
Daman Arora 2024-07-24 19:06:18 +05:30
parent b95f9c32d6
commit 5359098c14
1 changed files with 51 additions and 0 deletions
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51
pkg/proxy/apis/config/fuzzer/fuzzer.go
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@ -18,6 +18,7 @@ package fuzzer
import (
"fmt"
"net/netip"
"time"
"github.com/google/gofuzz"
@ -28,6 +29,55 @@ import (
"k8s.io/utils/ptr"
)
// generateRandomIP is copied from pkg/apis/networking/fuzzer/fuzzer.go
func generateRandomIP(is6 bool, c fuzz.Continue) string {
n := 4
if is6 {
n = 16
}
bytes := make([]byte, n)
for i := 0; i < n; i++ {
bytes[i] = uint8(c.Rand.Intn(255))
}
ip, ok := netip.AddrFromSlice(bytes)
if ok {
return ip.String()
}
// this should not happen
panic(fmt.Sprintf("invalid IP %v", bytes))
}
// generateRandomCIDR is copied from pkg/apis/networking/fuzzer/fuzzer.go
func generateRandomCIDR(is6 bool, c fuzz.Continue) string {
ip, err := netip.ParseAddr(generateRandomIP(is6, c))
if err != nil {
// generateRandomIP already panics if returns a not valid ip
panic(err)
}
n := 32
if is6 {
n = 128
}
bits := c.Rand.Intn(n)
prefix := netip.PrefixFrom(ip, bits)
return prefix.Masked().String()
}
// getRandomDualStackCIDR returns a random dual-stack CIDR.
func getRandomDualStackCIDR(c fuzz.Continue) []string {
cidrIPv4 := generateRandomCIDR(false, c)
cidrIPv6 := generateRandomCIDR(true, c)
cidrs := []string{cidrIPv4, cidrIPv6}
if c.RandBool() {
cidrs = []string{cidrIPv6, cidrIPv4}
}
return cidrs[:1+c.Intn(2)]
}
// Funcs returns the fuzzer functions for the kube-proxy apis.
func Funcs(codecs runtimeserializer.CodecFactory) []interface{} {
return []interface{}{
@ -35,6 +85,7 @@ func Funcs(codecs runtimeserializer.CodecFactory) []interface{} {
c.FuzzNoCustom(obj)
obj.BindAddress = fmt.Sprintf("%d.%d.%d.%d", c.Intn(256), c.Intn(256), c.Intn(256), c.Intn(256))
obj.ClientConnection.ContentType = c.RandString()
obj.DetectLocal.ClusterCIDRs = getRandomDualStackCIDR(c)
obj.Linux.Conntrack.MaxPerCore = ptr.To(c.Int31())
obj.Linux.Conntrack.Min = ptr.To(c.Int31())
obj.Linux.Conntrack.TCPCloseWaitTimeout = &metav1.Duration{Duration: time.Duration(c.Int63()) * time.Hour}