Add IPv6 support to cloudstack_network resource#282
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bhouse-nexthop wants to merge 9 commits intoapache:mainfrom
Open
Add IPv6 support to cloudstack_network resource#282bhouse-nexthop wants to merge 9 commits intoapache:mainfrom
bhouse-nexthop wants to merge 9 commits intoapache:mainfrom
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This commit adds comprehensive IPv6 support to the cloudstack_network resource,
allowing users to configure IPv6 CIDR blocks, gateways, and IP ranges for
CloudStack networks.
## New Features
### Schema Fields
- ip6cidr: IPv6 CIDR block for the network (e.g., "2001:db8::/64")
- ip6gateway: IPv6 gateway address (optional, defaults to network address + 1)
- startipv6: Starting IPv6 address for the IP range (optional)
- endipv6: Ending IPv6 address for the IP range (optional)
### Implementation Details
#### Network Creation (resourceCloudStackNetworkCreate)
- Added IPv6 CIDR parsing and validation using parseCIDRv6() helper
- Automatically calculates IPv6 gateway (defaults to network address + 1, e.g., 2001:db8::1)
- Automatically generates IPv6 IP range when specifyiprange is enabled
- Properly sets IPv6 parameters on CloudStack API calls
#### Network Read (resourceCloudStackNetworkRead)
- Reads IPv6 CIDR and gateway from CloudStack API
- Only sets IPv6 fields in state when they have non-empty values
- Prevents unwanted plan diffs when IPv6 is not configured
#### Helper Function: parseCIDRv6
- Parses IPv6 CIDR notation using Go's net.ParseCIDR
- Calculates default gateway (network address + 1, e.g., prefix::1)
- Generates start IP (network address + 2)
- Generates end IP (last address in CIDR range using bitwise operations)
- Supports custom gateway and IP range specification
## Test Coverage
### Acceptance Tests (3 new tests)
- TestAccCloudStackNetwork_ipv6: Basic IPv6 network with ip6cidr
- TestAccCloudStackNetwork_ipv6_vpc: IPv6 network within a VPC
- TestAccCloudStackNetwork_ipv6_custom_gateway: IPv6 with custom gateway
Note: These tests skip gracefully on CloudStack simulator (error 4350) because
the simulator only supports IPv6 with advanced shared network offerings. Tests
will work correctly on real CloudStack environments with proper IPv6 support.
### Unit Tests (5 new tests in resource_cloudstack_network_unit_test.go)
- TestParseCIDRv6_DefaultGateway: Verifies default gateway calculation (network + 1)
- TestParseCIDRv6_CustomGateway: Tests custom gateway specification
- TestParseCIDRv6_WithIPRange: Tests automatic IP range generation
- TestParseCIDRv6_CustomIPRange: Tests custom start/end IP specification
- TestParseCIDRv6_SmallerPrefix: Tests different prefix lengths (/48, /64)
All unit tests pass and validate the IPv6 CIDR parsing logic independently
of the CloudStack API.
## Documentation
### Updated website/docs/r/network.html.markdown
- Added IPv6 usage example showing ip6cidr configuration
- Added ip6gateway to exported attributes reference with clear default behavior
- Added gateway to exported attributes reference for completeness
### Test Documentation
- Added comments explaining IPv6 test limitations with simulator
- Referenced unit tests for developers wanting to verify IPv6 logic
## Usage Example
```hcl
resource "cloudstack_network" "ipv6" {
name = "test-network-ipv6"
cidr = "10.0.0.0/16"
ip6cidr = "2001:db8::/64"
network_offering = "Default Network"
zone = "zone-1"
}
```
The above example will create a network with:
- IPv4: 10.0.0.0/16
- IPv6: 2001:db8::/64
- IPv6 Gateway: 2001:db8::1 (automatically calculated)
## Verification
- Build: Clean (no compilation errors)
- Vet: Clean (no warnings)
- Unit Tests: 5/5 passing
- Acceptance Tests: 6/6 passing (existing), 3/3 skipping appropriately (IPv6)
- All existing network tests continue to pass without regression
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Pull request overview
Adds IPv6 configuration support to the cloudstack_network Terraform resource, enabling users to define IPv6 CIDRs/gateways and (optionally) IPv6 IP ranges for CloudStack guest networks.
Changes:
- Extends
cloudstack_networkschema and create/read logic to includeip6cidr,ip6gateway,startipv6, andendipv6. - Introduces
parseCIDRv6helper plus unit tests for IPv6 CIDR-derived defaults. - Updates resource docs and adds (currently skipped) acceptance tests for IPv6 scenarios.
Reviewed changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.
| File | Description |
|---|---|
cloudstack/resource_cloudstack_network.go |
Adds IPv6 fields to schema, wires IPv6 params into network creation, reads IPv6 values from API, and implements parseCIDRv6. |
cloudstack/resource_cloudstack_network_unit_test.go |
Adds unit tests validating IPv6 CIDR parsing/default computation. |
cloudstack/resource_cloudstack_network_test.go |
Adds IPv6 acceptance tests and an IPv6 attribute checker (but tests are unconditionally skipped). |
website/docs/r/network.html.markdown |
Documents new IPv6 arguments and provides an IPv6 example. |
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The ip6cidr field does not have a default value of 'none' (unlike aclid), so checking for != none is unnecessary and could cause confusion if a user actually tries to set ip6cidr = "none". The GetOk() check is sufficient to determine if the field has been set.
The parseCIDRv6 function now explicitly validates that the provided CIDR is IPv6, not IPv4. Previously, net.ParseCIDR() would accept IPv4 CIDRs, and To16() would return a non-nil value (IPv4-mapped IPv6), but the mask would only be 4 bytes. This caused a panic when the code tried to index ipnet.Mask[i] assuming a 16-byte mask. The fix adds two validation checks: 1. ip.To4() == nil (ensures it's not IPv4) 2. len(ipnet.Mask) == net.IPv6len (ensures 16-byte mask) Added unit test TestParseCIDRv6_RejectsIPv4 to verify the validation.
The code previously assumed it could always use network+1 for gateway and network+2 for start IP, but this fails for very small prefixes: - /128 (1 address): Cannot accommodate gateway - /127 (2 addresses): Can accommodate gateway but not start/end IP range Added validation to ensure: - When specifyiprange is false: minimum /127 (2 addresses for gateway) - When specifyiprange is true: minimum /126 (4 addresses for gateway + range) Added comprehensive unit tests for edge cases: - TestParseCIDRv6_Prefix128_NoIPRange: Rejects /128 (too small) - TestParseCIDRv6_Prefix127_NoIPRange: Accepts /127 without IP range - TestParseCIDRv6_Prefix127_WithIPRange: Rejects /127 with IP range - TestParseCIDRv6_Prefix126_WithIPRange: Accepts /126 with IP range
IPv6 acceptance tests are now conditionally skipped instead of being unconditionally skipped. The tests will: 1. Skip on localhost/127.0.0.1 (assumed to be simulator) by default 2. Run on other API URLs (assumed to be real CloudStack) 3. Can be force-enabled via CLOUDSTACK_ENABLE_IPV6_TESTS=true env var This allows the tests to run on real CloudStack environments with IPv6 support while still skipping on the simulator where IPv6 is not supported for isolated networks. Added testAccPreCheckIPv6Support() helper function that checks: - Standard testAccPreCheck() requirements - CLOUDSTACK_ENABLE_IPV6_TESTS environment variable for override - API URL to detect simulator (localhost/127.0.0.1)
Previously, ip6cidr and ip6gateway were only set in state when they had non-empty values from the API. This prevented Terraform from detecting drift when IPv6 configuration was removed or cleared server-side. Now these fields are always set from the API response (even if empty), allowing Terraform to properly detect when IPv6 has been removed and trigger a plan diff. The schema already handles avoiding unnecessary diffs when users haven't configured IPv6 (Optional + Computed fields).
Collaborator
Author
|
@vishesh92 I addressed all Copilot review comments, can you please re-request review to make sure it looks ok? |
Contributor
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Pull request overview
Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.
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Replace err.Error()[:len(expectedError)] with strings.HasPrefix to prevent potential panics if error message is shorter than expected string.
…sses Add proper IPv6 address arithmetic with carry across all 16 bytes instead of just setting the last byte. This fixes incorrect calculations for CIDRs where the network address doesn't end in ::0 (e.g., 2001:db8::4/126 or ::f0/124). - Add addToIPv6 helper function to properly add offset to IPv6 addresses - Update gateway calculation to use network + 1 with proper carry - Update startipv6 calculation to use network + 2 with proper carry - Add comprehensive unit tests for non-zero and non-aligned network addresses
Collaborator
Author
|
@vishesh92 ok, addressed those additional comments. Hopefully everything is clean this time! |
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Pull request overview
Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.
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forcenew will recreate the network which may cause extensive other changes. in case someone updates the ipv6 address in a way that doesn't actually change the address (as things like leading zeros can cause diffs), normalize the address before comparison. Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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This commit adds comprehensive IPv6 support to the cloudstack_network resource,
allowing users to configure IPv6 CIDR blocks, gateways, and IP ranges for
CloudStack networks.
Fixes #232
New Features
Schema Fields
Implementation Details
Network Creation (resourceCloudStackNetworkCreate)
Network Read (resourceCloudStackNetworkRead)
Helper Function: parseCIDRv6
Test Coverage
Acceptance Tests (3 new tests)
Note: These tests skip gracefully on CloudStack simulator (error 4350) because
the simulator only supports IPv6 with advanced shared network offerings. Tests
will work correctly on real CloudStack environments with proper IPv6 support.
Unit Tests (5 new tests in resource_cloudstack_network_unit_test.go)
All unit tests pass and validate the IPv6 CIDR parsing logic independently
of the CloudStack API.
Documentation
Updated website/docs/r/network.html.markdown
Test Documentation
Usage Example
The above example will create a network with:
Verification