[Enhancement] aws_efs_mount_target: Add ip_address_type and ipv6_address arguments to support IPv6 connectivity

[tabito-hara]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Description

This PR adds IPv6 support to EFS mount targets by introducing two new arguments for aws_efs_mount_target resource:

• ip_address_type – Specifies the IP address type for the mount target (ipv4, ipv6, or dual-stack).

  • Although the read API does not return this value directly, it can be inferred from the IpAddress and IpV6Address fields in the response. Therefore, it is marked as Computed.
  • Since the update API does not allow this attribute to be modified, it is marked as ForceNew.

• ipv6_address – The IPv6 address assigned to the mount target (a computed attribute when using IPv6).

  • The read API returns the assigned IPv6 address. Therefore, it is marked as Computed.
  • Since the update API does not allow this attribute to be modified, it is marked as ForceNew.

• The two attributes are also added to aws_efs_mount_target data source.

Relations

Closes #44078

References

https://docs.aws.amazon.com/efs/latest/ug/API_CreateMountTarget.html#efs-CreateMountTarget-request-Ipv6Address

Output from Acceptance Testing

Resources

$ make testacc TESTS=TestAccEFSMountTarget_ PKG=efs     
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.24.6 test ./internal/service/efs/... -v -count 1 -parallel 20 -run='TestAccEFSMountTarget_'  -timeout 360m -vet=off
2025/08/29 09:04:39 Creating Terraform AWS Provider (SDKv2-style)...
2025/08/29 09:04:39 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccEFSMountTarget_basic
=== PAUSE TestAccEFSMountTarget_basic
=== RUN   TestAccEFSMountTarget_disappears
=== PAUSE TestAccEFSMountTarget_disappears
=== RUN   TestAccEFSMountTarget_ipAddress
=== PAUSE TestAccEFSMountTarget_ipAddress
=== RUN   TestAccEFSMountTarget_ipAddressTypeIPv6Only
=== PAUSE TestAccEFSMountTarget_ipAddressTypeIPv6Only
=== RUN   TestAccEFSMountTarget_ipAddressTypeIPv6OnlyWithIPv6Address
=== PAUSE TestAccEFSMountTarget_ipAddressTypeIPv6OnlyWithIPv6Address
=== RUN   TestAccEFSMountTarget_ipAddressTypeDualStack
=== PAUSE TestAccEFSMountTarget_ipAddressTypeDualStack
=== RUN   TestAccEFSMountTarget_ipAddressTypeDualStackWithIPv6Address
=== PAUSE TestAccEFSMountTarget_ipAddressTypeDualStackWithIPv6Address
=== RUN   TestAccEFSMountTarget_IPAddress_emptyString
=== PAUSE TestAccEFSMountTarget_IPAddress_emptyString
=== CONT  TestAccEFSMountTarget_basic
=== CONT  TestAccEFSMountTarget_ipAddressTypeIPv6OnlyWithIPv6Address
=== CONT  TestAccEFSMountTarget_ipAddress
=== CONT  TestAccEFSMountTarget_ipAddressTypeDualStackWithIPv6Address
=== CONT  TestAccEFSMountTarget_IPAddress_emptyString
=== CONT  TestAccEFSMountTarget_ipAddressTypeDualStack
=== CONT  TestAccEFSMountTarget_disappears
=== CONT  TestAccEFSMountTarget_ipAddressTypeIPv6Only
--- PASS: TestAccEFSMountTarget_ipAddress (130.81s)
--- PASS: TestAccEFSMountTarget_IPAddress_emptyString (132.69s)
--- PASS: TestAccEFSMountTarget_disappears (139.97s)
--- PASS: TestAccEFSMountTarget_ipAddressTypeIPv6OnlyWithIPv6Address (147.24s)
--- PASS: TestAccEFSMountTarget_ipAddressTypeIPv6Only (147.34s)
--- PASS: TestAccEFSMountTarget_ipAddressTypeDualStackWithIPv6Address (152.15s)
--- PASS: TestAccEFSMountTarget_ipAddressTypeDualStack (156.69s)
--- PASS: TestAccEFSMountTarget_basic (232.04s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/efs        236.945s

Data sources

$ make testacc TESTS=TestAccEFSMountTargetDataSource_ PKG=efs
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.24.6 test ./internal/service/efs/... -v -count 1 -parallel 20 -run='TestAccEFSMountTargetDataSource_'  -timeout 360m -vet=off
2025/08/29 09:09:17 Creating Terraform AWS Provider (SDKv2-style)...
2025/08/29 09:09:17 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccEFSMountTargetDataSource_basic
=== PAUSE TestAccEFSMountTargetDataSource_basic
=== RUN   TestAccEFSMountTargetDataSource_byAccessPointID
=== PAUSE TestAccEFSMountTargetDataSource_byAccessPointID
=== RUN   TestAccEFSMountTargetDataSource_byFileSystemID
=== PAUSE TestAccEFSMountTargetDataSource_byFileSystemID
=== CONT  TestAccEFSMountTargetDataSource_basic
=== CONT  TestAccEFSMountTargetDataSource_byFileSystemID
=== CONT  TestAccEFSMountTargetDataSource_byAccessPointID
--- PASS: TestAccEFSMountTargetDataSource_byAccessPointID (125.98s)
--- PASS: TestAccEFSMountTargetDataSource_basic (126.82s)
--- PASS: TestAccEFSMountTargetDataSource_byFileSystemID (126.97s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/efs        131.154s

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[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccEFSMountTarget_\|TestAccEFSMountTargetDataSource_' PKG=efs ACCTEST_PARALLELISM=4
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.24.6 test ./internal/service/efs/... -v -count 1 -parallel 4  -run=TestAccEFSMountTarget_\|TestAccEFSMountTargetDataSource_ -timeout 360m -vet=off
2025/08/29 10:57:00 Creating Terraform AWS Provider (SDKv2-style)...
2025/08/29 10:57:00 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccEFSMountTargetDataSource_basic
=== PAUSE TestAccEFSMountTargetDataSource_basic
=== RUN   TestAccEFSMountTargetDataSource_byAccessPointID
=== PAUSE TestAccEFSMountTargetDataSource_byAccessPointID
=== RUN   TestAccEFSMountTargetDataSource_byFileSystemID
=== PAUSE TestAccEFSMountTargetDataSource_byFileSystemID
=== RUN   TestAccEFSMountTarget_basic
=== PAUSE TestAccEFSMountTarget_basic
=== RUN   TestAccEFSMountTarget_disappears
=== PAUSE TestAccEFSMountTarget_disappears
=== RUN   TestAccEFSMountTarget_ipAddress
=== PAUSE TestAccEFSMountTarget_ipAddress
=== RUN   TestAccEFSMountTarget_IPAddress_emptyString
=== PAUSE TestAccEFSMountTarget_IPAddress_emptyString
=== CONT  TestAccEFSMountTargetDataSource_basic
=== CONT  TestAccEFSMountTarget_disappears
=== CONT  TestAccEFSMountTarget_IPAddress_emptyString
=== CONT  TestAccEFSMountTarget_ipAddress
--- PASS: TestAccEFSMountTarget_disappears (117.85s)
=== CONT  TestAccEFSMountTargetDataSource_byFileSystemID
--- PASS: TestAccEFSMountTargetDataSource_basic (118.24s)
=== CONT  TestAccEFSMountTarget_basic
--- PASS: TestAccEFSMountTarget_ipAddress (121.04s)
=== CONT  TestAccEFSMountTargetDataSource_byAccessPointID
--- PASS: TestAccEFSMountTarget_IPAddress_emptyString (121.32s)
--- PASS: TestAccEFSMountTargetDataSource_byAccessPointID (115.29s)
--- PASS: TestAccEFSMountTargetDataSource_byFileSystemID (126.54s)
--- PASS: TestAccEFSMountTarget_basic (204.05s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/efs	327.774s

[ewbankkit]

@tabito-hara Thanks for the contribution 🎉 👏.

[github-actions]

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[github-actions]

This functionality has been released in v6.12.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
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