IPv6 subnet mapping for lb

aws/data_source_aws_lb.go

@@ -74,6 +74,10 @@ func dataSourceAwsLb() *schema.Resource {
 							Type:     schema.TypeString,
 							Computed: true,
 						},
+						"ipv6_address": {
+							Type:     schema.TypeString,
+							Computed: true,
+						},
 					},
 				},
 			},

aws/resource_aws_lb.go

@@ -109,6 +109,12 @@ func resourceAwsLb() *schema.Resource {
 							Required: true,
 							ForceNew: true,
 						},
+						"ipv6_address": {
+							Type:         schema.TypeString,
+							Optional:     true,
+							ForceNew:     true,
+							ValidateFunc: validation.IsIPv6Address,
+						},
 						"outpost_id": {
 							Type:     schema.TypeString,
 							Computed: true,
@@ -298,6 +304,10 @@ func resourceAwsLbCreate(d *schema.ResourceData, meta interface{}) error {
 			if subnetMap["private_ipv4_address"].(string) != "" {
 				elbOpts.SubnetMappings[i].PrivateIPv4Address = aws.String(subnetMap["private_ipv4_address"].(string))
 			}
+
+			if subnetMap["ipv6_address"].(string) != "" {
+				elbOpts.SubnetMappings[i].IPv6Address = aws.String(subnetMap["ipv6_address"].(string))
+			}
 		}
 	}
 
@@ -668,6 +678,7 @@ func flattenSubnetMappingsFromAvailabilityZones(availabilityZones []*elbv2.Avail
 		for _, loadBalancerAddress := range availabilityZone.LoadBalancerAddresses {
 			m["allocation_id"] = aws.StringValue(loadBalancerAddress.AllocationId)
 			m["private_ipv4_address"] = aws.StringValue(loadBalancerAddress.PrivateIPv4Address)
+			m["ipv6_address"] = aws.StringValue(loadBalancerAddress.IPv6Address)
 		}
 
 		l = append(l, m)

aws/resource_aws_lb_test.go

@@ -194,6 +194,37 @@ func TestAccAWSLB_LoadBalancerType_Gateway(t *testing.T) {
 	})
 }
 
+func TestAccAWSLB_IPv6SubnetMapping(t *testing.T) {
+	var conf elbv2.LoadBalancer
+	rName := acctest.RandomWithPrefix("tf-acc-test")
+	resourceName := "aws_lb.test"
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:          func() { testAccPreCheck(t); testAccPreCheckElbv2GatewayLoadBalancer(t) },
+		ProviderFactories: testAccProviderFactories,
+		CheckDestroy:      testAccCheckAWSLBDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccAWSLBConfig_IPv6(rName),
+				Check: resource.ComposeAggregateTestCheckFunc(
+					testAccCheckAWSLBExists(resourceName, &conf),
+					resource.TestMatchResourceAttr(resourceName, "subnet_mapping.0.ipv6_address", regexp.MustCompile("[a-f0-6]+:[a-f0-6:]+")),
+				),
+			},
+			{
+				ResourceName:      resourceName,
+				ImportState:       true,
+				ImportStateVerify: true,
+				ImportStateVerifyIgnore: []string{
+					"drop_invalid_header_fields",
+					"enable_http2",
+					"idle_timeout",
+				},
+			},
+		},
+	})
+}
+
 func TestAccAWSLB_LoadBalancerType_Gateway_EnableCrossZoneLoadBalancing(t *testing.T) {
 	var conf elbv2.LoadBalancer
 	rName := acctest.RandomWithPrefix("tf-acc-test")
@@ -1956,6 +1987,55 @@ resource "aws_lb" "test" {
 `, rName))
 }
 
+func testAccAWSLBConfig_IPv6(rName string) string {
+	return composeConfig(
+		testAccAvailableAZsNoOptInConfig(),
+		fmt.Sprintf(`
+resource "aws_vpc" "test" {
+  assign_generated_ipv6_cidr_block = true
+  cidr_block                       = "10.10.10.0/25"
+
+  tags = {
+    Name = "tf-acc-test-load-balancer"
+  }
+}
+
+resource "aws_internet_gateway" "gw" {
+  vpc_id = aws_vpc.test.id
+
+  tags = {
+    Name = "main"
+  }
+}
+
+resource "aws_subnet" "test" {
+  availability_zone = data.aws_availability_zones.available.names[0]
+  cidr_block        = cidrsubnet(aws_vpc.test.cidr_block, 2, 0)
+  ipv6_cidr_block   = cidrsubnet(aws_vpc.test.ipv6_cidr_block, 8, 16)
+  vpc_id            = aws_vpc.test.id
+
+  tags = {
+    Name = "tf-acc-test-load-balancer"
+  }
+}
+
+resource "aws_lb" "test" {
+  name                       = %[1]q
+  load_balancer_type         = "network"
+  enable_deletion_protection = false
+
+  subnet_mapping {
+    subnet_id    = aws_subnet.test.id
+    ipv6_address = cidrhost(cidrsubnet(aws_vpc.test.ipv6_cidr_block, 8, 16), 5)
+  }
+
+  tags = {
+    Name = "TestAccAWSALB_ipv6address"
+  }
+}
+`, rName))
+}
+
 func testAccAWSLBConfig_LoadBalancerType_Gateway_EnableCrossZoneLoadBalancing(rName string, enableCrossZoneLoadBalancing bool) string {
 	return composeConfig(
 		testAccAvailableAZsNoOptInConfig(),

website/docs/r/lb.html.markdown

@@ -135,6 +135,7 @@ Subnet Mapping (`subnet_mapping`) blocks support the following:
 * `subnet_id` - (Required) The id of the subnet of which to attach to the load balancer. You can specify only one subnet per Availability Zone.
 * `allocation_id` - (Optional) The allocation ID of the Elastic IP address.
 * `private_ipv4_address` - (Optional) A private ipv4 address within the subnet to assign to the internal-facing load balancer.
+* `ipv6_address` - (Optional) An ipv6 address within the subnet to assign to the internal-facing load balancer.
 
 ## Attributes Reference