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test(pkg/rfc2317): cover bare IPv6 and invalid-mask edge cases #6437

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k8s-ci-robot merged 1 commit into from
May 15, 2026
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test(pkg/rfc2317): cover bare IPv6 and invalid-mask edge cases #6437

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9 changes: 9 additions & 0 deletions pkg/rfc2317/arpa_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -93,11 +93,20 @@ func TestCidrToInAddr(t *testing.T) {
// IPv4-mapped IPv6 addresses:
{"::ffff:174.136.107.15", "15.107.136.174.in-addr.arpa", ""},

// Bare IPv6 addresses (no "/", treated as /128).
{"2001::", "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.0.2.ip6.arpa", ""},
{"2001:db8::", "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa", ""},
{"::1", "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa", ""},

// Error Cases:
{"0.0.0.0/0", "", "cannot use /0 in reverse CIDR"},
{"2001::/0", "", "CIDR 2001::/0 has 1 bits beyond the mask"},
{"4.5/16", "", "invalid CIDR address: 4.5/16"},
{"foo.com", "", "invalid CIDR address: foo.com"},
// IPv4 mask not a multiple of 8 (and not in the /25-/31 RFC2317 range).
{"174.0.0.0/15", "", "IPv4 mask must be multiple of 8 bits"},
// IPv6 mask not a multiple of 4.
{"2001:db80::/30", "", "IPv6 mask must be multiple of 4 bits"},
}
for i, tst := range tests {
t.Run(fmt.Sprintf("%d--%s", i, tst.in), func(t *testing.T) {
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