fix: do not create reserved host-route subnets during subnet division Fixes #1468 - #1475
fix: do not create reserved host-route subnets during subnet division Fixes #1468#1475SurbhiAgarwal1 wants to merge 1 commit into
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Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟡 Moderate · up to Host-route allocation can skip the first available address and incorrectly report subnet exhaustion. This should be corrected before merge. Suggested reviewers: Caution Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional.
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Full details: Linked Issues checkExplanation The changes satisfy issue Full details: Ui Changes, Regression Test, DocsExplanation The change affects the end-user-facing IPAM admin subnet list. The committed diff removes creation of the
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Code Review SummaryStatus: No Issues Found | Recommendation: Merge Files Reviewed (1 file)
All previously raised findings are resolved in the current HEAD ( Previous Review Summaries (2 snapshots, latest commit 1c806de)Current summary above is authoritative. Previous snapshots are kept for context only. Previous review (commit 1c806de)Status: No Issues Found | Recommendation: Merge Files Reviewed (2 files)
Previous review (commit 39b2869)Status: 1 Issue Found | Recommendation: Address before merge Overview
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In `@openwisp_controller/subnet_division/tests/test_models.py`:
- Around line 755-757: Update the IPv6 _get_vpn_subdivision_rule call to pass
the distinct label "OW_V6", preventing a duplicate organization/label conflict
with the IPv4 rule while preserving the existing IPv6 test assertions.
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137-141: LGTM!
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Thanks @SurbhiAgarwal1, please fix the pre-merge checks, see my comments below.
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Hi @nemesifier, thanks for the review! Updated in the latest push (
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Inline comments:
In `@openwisp_controller/subnet_division/rule_types/base.py`:
- Line 224: The subnet allocation flow around create_subnets must evaluate the
initial host-route prefix before advancing max_subnet; update the
starting-candidate state or iteration order so the first available /32 or /128
is not skipped. Preserve existing handling of required_subnet and ensure
allocations can recover that initial prefix when it is available.
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Checklist
Reference to Existing Issue
Closes #1468.
Description of Changes
When subnet division provisions the initial child subnet for a host-route rule (/32 IPv4 or /128 IPv6), the allocator was persisting an internal allocation cursor as an IPAM subnet named
Reserved Subnet <prefix>. Because /32 and /128 prefixes contain only a single host address, persisting this record created an unexplained, unassigned empty host allocation in the IPAM administration interface.This PR introduces the following changes:
get_max_subnetinopenwisp_controller/subnet_division/rule_types/base.pyto check if the rule is a host-route prefix (/32 for IPv4 or /128 for IPv6) and skip creating theReserved SubnetDB record while setting the candidate prefix dynamically.test_models.py(test_no_reserved_subnet_for_host_routes) covering /32 and /128 subnet division rules to verify no reserved subnets are created.docs/user/subnet-division-rules.rstto document the host-route exception for reserved subnet creation.Screenshot
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