Overlapping IPRanges are accepted if prefix lengths are different

[candlerb]

Deployment Type

Self-hosted

NetBox Version

v4.0.11

Python Version

3.12

Steps to Reproduce

1. Create an IPRange with start 1.2.3.100/24 and end 1.2.3.200/24
2. Create an IPRange with start 1.2.3.123/26 and end 1.2.3.124/26

Expected Behavior

The second IPRange should be rejected, as it overlaps with the first. (There is code in IPRange.clean() which is clearly intended to do this)

Observed Behavior

The overlapping range is accepted.

The problem occurs because the Django ORM lte/gte filter for overlapping ranges only works if the prefix lengths match:

>>> ip = "1.2.3.101/24"
>>> IPRange.objects.filter(start_address__lte=ip, end_address__gte=ip, vrf=None)
<RestrictedQuerySet [<IPRange: 1.2.3.100-200/24>]>
>>> ip = "1.2.3.101/26"
>>> IPRange.objects.filter(start_address__lte=ip, end_address__gte=ip, vrf=None)
<RestrictedQuerySet []>

I cannot see an obvious solution here, apart from brute force iterating over all possible prefix lengths:

>>> [IPRange.objects.filter(start_address__lte=f"1.2.3.101/{pl}", end_address__gte=f"1.2.3.101/{pl}", vrf=None).count() for pl in range(33)]
[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, 0, 0, 0, 0, 0, 0]

Alternatively, changing the data model so that a range uses IPAddress instead of IPNetwork for the start/end addresses would eliminate this problem.