add support for ipv6

apis/v1alpha1/nginxproxy_types.go

@@ -10,7 +10,7 @@ import metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 
 // NginxProxy is a configuration object that is attached to a GatewayClass parametersRef. It provides a way
 // to configure global settings for all Gateways defined from the GatewayClass.
-type NginxProxy struct { //nolint:govet // standard field alignment, don't change it
+type NginxProxy struct {
 	metav1.TypeMeta   `json:",inline"`
 	metav1.ObjectMeta `json:"metadata,omitempty"`
 
@@ -27,12 +27,31 @@ type NginxProxyList struct {
 	Items           []NginxProxy `json:"items"`
 }
 
+// IPFamilyType specifies the IP family to be used by the server.
+//
+// +kubebuilder:validation:Enum=dual;ipv4;ipv6
+type IPFamilyType string
+
+const (
+	// Dual specifies that the server will use both IPv4 and IPv6.
+	Dual IPFamilyType = "dual"
+	// IPv4 specifies that the server will use only IPv4.
+	IPv4 IPFamilyType = "ipv4"
+	// IPv6 specifies that the server will use only IPv6.
+	IPv6 IPFamilyType = "ipv6"
+)
+
 // NginxProxySpec defines the desired state of the NginxProxy.
 type NginxProxySpec struct {
 	// Telemetry specifies the OpenTelemetry configuration.
 	//
 	// +optional
 	Telemetry *Telemetry `json:"telemetry,omitempty"`
+	// IPFamily specifies the IP family to be used by the server.
+	// Default is "dual", meaning the server will use both IPv4 and IPv6.
+	//
+	// +optional
+	IPFamily IPFamilyType `json:"ipFamily,omitempty"`
 	// DisableHTTP2 defines if http2 should be disabled for all servers.
 	// Default is false, meaning http2 will be enabled for all servers.
 	//

charts/nginx-gateway-fabric/values.yaml

@@ -86,6 +86,7 @@ nginx:
   config:
     {}
     # disableHTTP2: false
+    # ipFamily: dual
     # telemetry:
     #   exporter:
     #     endpoint: otel-collector.default.svc:4317

config/crd/bases/gateway.nginx.org_nginxproxies.yaml

@@ -52,6 +52,15 @@ spec:
                   DisableHTTP2 defines if http2 should be disabled for all servers.
                   Default is false, meaning http2 will be enabled for all servers.
                 type: boolean
+              ipFamily:
+                description: |-
+                  IPFamily specifies the IP family to be used by the server.
+                  Default is "dual", meaning the server will use both IPv4 and IPv6.
+                enum:
+                - dual
+                - ipv4
+                - ipv6
+                type: string
               telemetry:
                 description: Telemetry specifies the OpenTelemetry configuration.
                 properties:

deploy/crds.yaml

@@ -697,6 +697,15 @@ spec:
                   DisableHTTP2 defines if http2 should be disabled for all servers.
                   Default is false, meaning http2 will be enabled for all servers.
                 type: boolean
+              ipFamily:
+                description: |-
+                  IPFamily specifies the IP family to be used by the server.
+                  Default is "dual", meaning the server will use both IPv4 and IPv6.
+                enum:
+                - dual
+                - ipv4
+                - ipv6
+                type: string
               telemetry:
                 description: Telemetry specifies the OpenTelemetry configuration.
                 properties:

docs/developer/quickstart.md

@@ -114,10 +114,29 @@ This will build the docker images `nginx-gateway-fabric:<your-user>` and `nginx-
 
 1. Create a `kind` cluster:
 
+   To create a `kind` cluster with IPv4 enabled:
+
    ```makefile
    make create-kind-cluster
    ```
 
+   To create a `kind` cluster with IPv6 or Dual IPFamily enabled, use this `config.yaml`:
+
+   ```yaml
+   kind: Cluster
+   apiVersion: kind.x-k8s.io/v1alpha4
+   nodes:
+   - role: control-plane
+   networking:
+     ipFamily: dual
+     # ipFamily: ipv6
+     apiServerAddress: 127.0.0.1
+   ```
+
+   ```shell
+   kind create cluster --config ~/cluster.yaml
+   ```
+
 2. Load the previously built images onto your `kind` cluster:
 
    ```shell

internal/mode/static/nginx/config/http/config.go

@@ -10,6 +10,13 @@ type Server struct {
 	IsDefaultHTTP bool
 	IsDefaultSSL  bool
 	GRPC          bool
+	IPFamily      IPFamily
+}
+
+// IPFamily holds the IP family configuration for all servers.
+type IPFamily struct {
+	IPv4 bool
+	IPv6 bool
 }
 
 // Location holds all configuration for an HTTP location.

internal/mode/static/nginx/config/servers.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 	gotemplate "text/template"
 
+	ngfAPI "github.com/nginxinc/nginx-gateway-fabric/apis/v1alpha1"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/framework/helpers"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/mode/static/nginx/config/http"
 	"github.com/nginxinc/nginx-gateway-fabric/internal/mode/static/state/dataplane"
@@ -58,7 +59,8 @@ var grpcBaseHeaders = []http.Header{
 }
 
 func executeServers(conf dataplane.Configuration) []executeResult {
-	servers, httpMatchPairs := createServers(conf.HTTPServers, conf.SSLServers)
+	ipFamily := getIPFamily(conf.BaseHTTPConfig)
+	servers, httpMatchPairs := createServers(conf.HTTPServers, conf.SSLServers, ipFamily)
 
 	serverResult := executeResult{
 		dest: httpConfigFile,
@@ -86,6 +88,18 @@ func executeServers(conf dataplane.Configuration) []executeResult {
 	return allResults
 }
 
+// getIPFamily returns whether the server should be configured for IPv4, IPv6, or both.
+func getIPFamily(baseHTTPConfig dataplane.BaseHTTPConfig) http.IPFamily {
+	switch ip := baseHTTPConfig.IPFamily; ip {
+	case ngfAPI.IPv4:
+		return http.IPFamily{IPv4: true}
+	case ngfAPI.IPv6:
+		return http.IPFamily{IPv6: true}
+	}
+
+	return http.IPFamily{IPv4: true, IPv6: true}
+}
+
 func createAdditionFileResults(conf dataplane.Configuration) []executeResult {
 	uniqueAdditions := make(map[string][]byte)
 
@@ -141,30 +155,39 @@ func createIncludes(additions []dataplane.Addition) []string {
 	return includes
 }
 
-func createServers(httpServers, sslServers []dataplane.VirtualServer) ([]http.Server, httpMatchPairs) {
+func createServers(
+	httpServers,
+	sslServers []dataplane.VirtualServer,
+	ipFamily http.IPFamily,
+) ([]http.Server, httpMatchPairs) {
 	servers := make([]http.Server, 0, len(httpServers)+len(sslServers))
 	finalMatchPairs := make(httpMatchPairs)
 
 	for serverID, s := range httpServers {
-		httpServer, matchPairs := createServer(s, serverID)
+		httpServer, matchPairs := createServer(s, serverID, ipFamily)
 		servers = append(servers, httpServer)
 		maps.Copy(finalMatchPairs, matchPairs)
 	}
 
 	for serverID, s := range sslServers {
-		sslServer, matchPair := createSSLServer(s, serverID)
+		sslServer, matchPair := createSSLServer(s, serverID, ipFamily)
 		servers = append(servers, sslServer)
 		maps.Copy(finalMatchPairs, matchPair)
 	}
 
 	return servers, finalMatchPairs
 }
 
-func createSSLServer(virtualServer dataplane.VirtualServer, serverID int) (http.Server, httpMatchPairs) {
+func createSSLServer(
+	virtualServer dataplane.VirtualServer,
+	serverID int,
+	ipFamily http.IPFamily,
+) (http.Server, httpMatchPairs) {
 	if virtualServer.IsDefault {
 		return http.Server{
 			IsDefaultSSL: true,
 			Port:         virtualServer.Port,
+			IPFamily:     ipFamily,
 		}, nil
 	}
 
@@ -180,14 +203,20 @@ func createSSLServer(virtualServer dataplane.VirtualServer, serverID int) (http.
 		Port:      virtualServer.Port,
 		GRPC:      grpc,
 		Includes:  createIncludes(virtualServer.Additions),
+		IPFamily:  ipFamily,
 	}, matchPairs
 }
 
-func createServer(virtualServer dataplane.VirtualServer, serverID int) (http.Server, httpMatchPairs) {
+func createServer(
+	virtualServer dataplane.VirtualServer,
+	serverID int,
+	ipFamily http.IPFamily,
+) (http.Server, httpMatchPairs) {
 	if virtualServer.IsDefault {
 		return http.Server{
 			IsDefaultHTTP: true,
 			Port:          virtualServer.Port,
+			IPFamily:      ipFamily,
 		}, nil
 	}
 
@@ -199,6 +228,7 @@ func createServer(virtualServer dataplane.VirtualServer, serverID int) (http.Ser
 		Port:       virtualServer.Port,
 		GRPC:       grpc,
 		Includes:   createIncludes(virtualServer.Additions),
+		IPFamily:   ipFamily,
 	}, matchPairs
 }
 

internal/mode/static/nginx/config/servers_template.go

@@ -5,30 +5,50 @@ js_preload_object matches from /etc/nginx/conf.d/matches.json;
 {{- range $s := . -}}
     {{ if $s.IsDefaultSSL -}}
 server {
+        {{- if $s.IPFamily.IPv4 }}
     listen {{ $s.Port }} ssl default_server;
+        {{- end }}
+        {{- if $s.IPFamily.IPv6 }}
+    listen [::]:{{ $s.Port }} ssl default_server;
+        {{- end }}
 
     ssl_reject_handshake on;
 }
     {{- else if $s.IsDefaultHTTP }}
 server {
+        {{- if $s.IPFamily.IPv4 }}
     listen {{ $s.Port }} default_server;
+        {{- end }}
+        {{- if $s.IPFamily.IPv6 }}
+    listen [::]:{{ $s.Port }} default_server;
+        {{- end }}
 
     default_type text/html;
     return 404;
 }
     {{- else }}
 server {
         {{- if $s.SSL }}
+        {{- if $s.IPFamily.IPv4 }}
     listen {{ $s.Port }} ssl;
+        {{- end }}
+        {{- if $s.IPFamily.IPv6 }}
+    listen [::]:{{ $s.Port }} ssl;
+        {{- end }}
     ssl_certificate {{ $s.SSL.Certificate }};
     ssl_certificate_key {{ $s.SSL.CertificateKey }};
 
     if ($ssl_server_name != $host) {
         return 421;
     }
         {{- else }}
+        {{- if $s.IPFamily.IPv4 }}
     listen {{ $s.Port }};
         {{- end }}
+        {{- if $s.IPFamily.IPv6 }}
+    listen [::]:{{ $s.Port }};
+        {{- end }}
+        {{- end }}
 
     server_name {{ $s.ServerName }};