API Specification

Packages:

gateway.networking.k8s.io/v1alpha2

Package v1alpha2 contains API Schema definitions for the gateway.networking.k8s.io API group.

Resource Types:

Gateway

Gateway represents an instantiation of a service-traffic handling infrastructure by binding Listeners to a set of IP addresses.

Implementations should add the gateway-exists-finalizer.gateway.networking.k8s.io finalizer on the associated GatewayClass whenever Gateway(s) is running. This ensures that a GatewayClass associated with a Gateway(s) is not deleted while in use.

Field Description
apiVersion
string
gateway.networking.k8s.io/v1alpha2
kind
string
Gateway
metadata
Kubernetes meta/v1.ObjectMeta
Refer to the Kubernetes API documentation for the fields of the metadata field.
spec
GatewaySpec

Spec defines the desired state of Gateway.



gatewayClassName
string

GatewayClassName used for this Gateway. This is the name of a GatewayClass resource.

listeners
[]Listener

Listeners associated with this Gateway. Listeners define logical endpoints that are bound on this Gateway’s addresses. At least one Listener MUST be specified.

An implementation MAY group Listeners by Port and then collapse each group of Listeners into a single Listener if the implementation determines that the Listeners in the group are “compatible”. An implementation MAY also group together and collapse compatible Listeners belonging to different Gateways.

For example, an implementation might consider Listeners to be compatible with each other if all of the following conditions are met:

  1. Either each Listener within the group specifies the “HTTP” Protocol or each Listener within the group specifies either the “HTTPS” or “TLS” Protocol.

  2. Each Listener within the group specifies a Hostname that is unique within the group.

  3. As a special case, one Listener within a group may omit Hostname, in which case this Listener matches when no other Listener matches.

If the implementation does collapse compatible Listeners, the hostname provided in the incoming client request MUST be matched to a Listener to find the correct set of Routes. The incoming hostname MUST be matched using the Hostname field for each Listener in order of most to least specific. That is, exact matches must be processed before wildcard matches.

If this field specifies multiple Listeners that have the same Port value but are not compatible, the implementation must raise a “Conflicted” condition in the Listener status.

Support: Core

addresses
[]GatewayAddress
(Optional)

Addresses requested for this gateway. This is optional and behavior can depend on the GatewayClass. If a value is set in the spec and the requested address is invalid, the GatewayClass MUST indicate this in the associated entry in GatewayStatus.Addresses.

If no Addresses are specified, the GatewayClass may schedule the Gateway in an implementation-defined manner, assigning an appropriate set of Addresses.

The GatewayClass MUST bind all Listeners to every GatewayAddress that it assigns to the Gateway.

Support: Core

status
GatewayStatus

Status defines the current state of Gateway.

GatewayClass

GatewayClass describes a class of Gateways available to the user for creating Gateway resources.

GatewayClass is a Cluster level resource.

Field Description
apiVersion
string
gateway.networking.k8s.io/v1alpha2
kind
string
GatewayClass
metadata
Kubernetes meta/v1.ObjectMeta
Refer to the Kubernetes API documentation for the fields of the metadata field.
spec
GatewayClassSpec

Spec defines the desired state of GatewayClass.



controller
string

Controller is a domain/path string that indicates the controller that is managing Gateways of this class.

Example: “acme.io/gateway-controller”.

This field is not mutable and cannot be empty.

The format of this field is DOMAIN “/” PATH, where DOMAIN is a valid Kubernetes name (https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names) and PATH is a valid HTTP path as defined by RFC 3986.

Support: Core

parametersRef
ParametersReference
(Optional)

ParametersRef is a reference to a resource that contains the configuration parameters corresponding to the GatewayClass. This is optional if the controller does not require any additional configuration.

ParametersRef can reference a standard Kubernetes resource, i.e. ConfigMap, or an implementation-specific custom resource. The resource can be cluster-scoped or namespace-scoped.

If the referent cannot be found, the GatewayClass’s “InvalidParameters” status condition will be true.

Support: Custom

description
string
(Optional)

Description helps describe a GatewayClass with more details.

status
GatewayClassStatus

Status defines the current state of GatewayClass.

HTTPRoute

HTTPRoute is the Schema for the HTTPRoute resource.

Field Description
apiVersion
string
gateway.networking.k8s.io/v1alpha2
kind
string
HTTPRoute
metadata
Kubernetes meta/v1.ObjectMeta
Refer to the Kubernetes API documentation for the fields of the metadata field.
spec
HTTPRouteSpec

Spec defines the desired state of HTTPRoute.



gateways
RouteGateways
(Optional)

Gateways defines which Gateways can use this Route.

hostnames
[]Hostname
(Optional)

Hostnames defines a set of hostname that should match against the HTTP Host header to select a HTTPRoute to process the request. Hostname is the fully qualified domain name of a network host, as defined by RFC 3986. Note the following deviations from the “host” part of the URI as defined in the RFC:

  1. IPs are not allowed.
  2. The : delimiter is not respected because ports are not allowed.

Incoming requests are matched against the hostnames before the HTTPRoute rules. If no hostname is specified, traffic is routed based on the HTTPRouteRules.

Requests will be matched against the Host field in the following order:

  1. If Hostname is precise, the request matches this rule if the HTTP Host header is equal to the Hostname.
  2. If Hostname is a wildcard, then the request matches this rule if the HTTP Host header is to equal to the suffix (removing the first label) of the wildcard rule.
  3. If Hostname is unspecified, empty, or *, then any request will match this route.

If a hostname is specified by the Listener that the HTTPRoute is bound to, at least one hostname specified here must match the Listener specified hostname as per the rules above. Other hostnames will not affect processing of the route in that case.

If no hostname is specified by the Listener, then that value will be treated as ‘*’, match any hostname, and so any hostname on this Route will match.

If all hostnames do not match, then the HTTPRoute is not admitted, and the implementation must raise an ‘Admitted’ Condition with a status of false for that Listener.

Examples: - A Listener with unspecified, empty, or * values for Hostname matches any HTTPRoute hostname. - A HTTPRoute with unspecified, empty, or * values for Hostname matches any Listener hostname. - A Listener with test.foo.com as the hostname matches only test.foo.com or *.foo.com. Any other hostnames present must be ignored. - A Listener with *.foo.com as hostname, all hostnames in the HTTPRoute must have any single label where the star is, and the rest of the hostname must match exactly. So, test.foo.com, *.foo.com or blog.foo.com match. test.blog.foo.com, test.bar.com, or bar.com do not. Hostnames that do not match will be ignored.

Support: Core

tls
RouteTLSConfig
(Optional)

TLS defines the TLS certificate to use for Hostnames defined in this Route. This configuration only takes effect if the AllowRouteOverride field is set to true in the associated Gateway resource.

Collisions can happen if multiple HTTPRoutes define a TLS certificate for the same hostname. In such a case, conflict resolution guiding principles apply, specifically, if hostnames are same and two different certificates are specified then the certificate in the oldest resource wins.

Please note that HTTP Route-selection takes place after the TLS Handshake (ClientHello). Due to this, TLS certificate defined here will take precedence even if the request has the potential to match multiple routes (in case multiple HTTPRoutes share the same hostname).

Support: Core

rules
[]HTTPRouteRule
(Optional)

Rules are a list of HTTP matchers, filters and actions.

status
HTTPRouteStatus

Status defines the current state of HTTPRoute.

TCPRoute

TCPRoute is the Schema for the TCPRoute resource.

Field Description
apiVersion
string
gateway.networking.k8s.io/v1alpha2
kind
string
TCPRoute
metadata
Kubernetes meta/v1.ObjectMeta
Refer to the Kubernetes API documentation for the fields of the metadata field.
spec
TCPRouteSpec

Spec defines the desired state of TCPRoute.



rules
[]TCPRouteRule

Rules are a list of TCP matchers and actions.

gateways
RouteGateways
(Optional)

Gateways defines which Gateways can use this Route.

status
TCPRouteStatus

Status defines the current state of TCPRoute.

TLSRoute

The TLSRoute resource is similar to TCPRoute, but can be configured to match against TLS-specific metadata. This allows more flexibility in matching streams for a given TLS listener.

If you need to forward traffic to a single target for a TLS listener, you could choose to use a TCPRoute with a TLS listener.

Field Description
apiVersion
string
gateway.networking.k8s.io/v1alpha2
kind
string
TLSRoute
metadata
Kubernetes meta/v1.ObjectMeta
Refer to the Kubernetes API documentation for the fields of the metadata field.
spec
TLSRouteSpec

Spec defines the desired state of TLSRoute.



gateways
RouteGateways
(Optional)

Gateways defines which Gateways can use this Route.

hostnames
[]Hostname
(Optional)

Hostnames defines a set of SNI names that should match against the SNI attribute of TLS ClientHello message in TLS handshake.

SNI can be “precise” which is a domain name without the terminating dot of a network host (e.g. “foo.example.com”) or “wildcard”, which is a domain name prefixed with a single wildcard label (e.g. *.example.com). The wildcard character * must appear by itself as the first DNS label and matches only a single label. You cannot have a wildcard label by itself (e.g. Host == *).

Requests will be matched against the Host field in the following order:

  1. If SNI is precise, the request matches this rule if the SNI in ClientHello is equal to one of the defined SNIs.
  2. If SNI is a wildcard, then the request matches this rule if the SNI is to equal to the suffix (removing the first label) of the wildcard rule.
  3. If SNIs is unspecified, all requests associated with the gateway TLS listener will match. This can be used to define a default backend for a TLS listener.

Support: Core

rules
[]TLSRouteRule

Rules are a list of TLS matchers and actions.

status
TLSRouteStatus

Status defines the current state of TLSRoute.

UDPRoute

UDPRoute is a resource that specifies how a Gateway should forward UDP traffic.

Field Description
apiVersion
string
gateway.networking.k8s.io/v1alpha2
kind
string
UDPRoute
metadata
Kubernetes meta/v1.ObjectMeta
Refer to the Kubernetes API documentation for the fields of the metadata field.
spec
UDPRouteSpec

Spec defines the desired state of UDPRoute.



rules
[]UDPRouteRule

Rules are a list of UDP matchers and actions.

gateways
RouteGateways
(Optional)

Gateways defines which Gateways can use this Route.

status
UDPRouteStatus

Status defines the current state of UDPRoute.

AddressType (string alias)

(Appears on: GatewayAddress)

AddressType defines how a network address is represented as a text string.

If the requested address is unsupported, the controller should raise the “Detached” listener status condition on the Gateway with the “UnsupportedAddress” reason.

Value Description

"Hostname"

A Hostname represents a DNS based ingress point. This is similar to the corresponding hostname field in Kubernetes load balancer status. For example, this concept may be used for cloud load balancers where a DNS name is used to expose a load balancer.

Support: Extended

"IPAddress"

A textual representation of a numeric IP address. IPv4 addresses must be in dotted-decimal form. IPv6 addresses must be in a standard IPv6 text representation (see RFC 5952).

Support: Extended

"NamedAddress"

A NamedAddress provides a way to reference a specific IP address by name. For example, this may be a name or other unique identifier that refers to a resource on a cloud provider such as a static IP.

Support: Implementation-Specific

GatewayAddress

(Appears on: GatewaySpec, GatewayStatus)

GatewayAddress describes an address that can be bound to a Gateway.

Field Description
type
AddressType
(Optional)

Type of the address.

Support: Extended

value
string

Value of the address. The validity of the values will depend on the type and support by the controller.

Examples: 1.2.3.4, 128::1, my-ip-address.

GatewayAllowType (string alias)

(Appears on: RouteGateways)

GatewayAllowType specifies which Gateways should be allowed to use a Route.

Value Description

"All"

Any Gateway will be able to use this route.

"FromList"

Only Gateways that have been specified in GatewayRefs will be able to use this route.

"SameNamespace"

Only Gateways within the same namespace as the route will be able to use this route.

GatewayClassConditionReason (string alias)

GatewayClassConditionReason defines the set of reasons that explain why a particular GatewayClass condition type has been raised.

Value Description

"Admitted"

This reason is used with the “Admitted” condition when the condition is true.

"InvalidParameters"

This reason is used with the “Admitted” condition when the GatewayClass was not admitted because the parametersRef field was invalid, with more detail in the message.

"Waiting"

This reason is used with the “Admitted” condition when the requested controller has not yet made a decision about whether to admit the GatewayClass. It is the default Reason on a new GatewayClass. It indicates

GatewayClassConditionType (string alias)

GatewayClassConditionType is the type for status conditions on Gateway resources. This type should be used with the GatewayClassStatus.Conditions field.

Value Description

"Admitted"

This condition indicates whether the GatewayClass has been admitted by the controller requested in the spec.controller field.

This condition defaults to False, and MUST be set by a controller when it sees a GatewayClass using its controller string. The status of this condition MUST be set to true if the controller will support provisioning Gateways using this class. Otherwise, this status MUST be set to false. If the status is set to false, the controller SHOULD set a Message and Reason as an explanation.

Possible reasons for this condition to be true are:

  • “Admitted”

Possible reasons for this condition to be false are:

  • “InvalidParameters”
  • “Waiting”

Controllers should prefer to use the values of GatewayClassConditionReason for the corresponding Reason, where appropriate.

GatewayClassSpec

(Appears on: GatewayClass)

GatewayClassSpec reflects the configuration of a class of Gateways.

Field Description
controller
string

Controller is a domain/path string that indicates the controller that is managing Gateways of this class.

Example: “acme.io/gateway-controller”.

This field is not mutable and cannot be empty.

The format of this field is DOMAIN “/” PATH, where DOMAIN is a valid Kubernetes name (https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names) and PATH is a valid HTTP path as defined by RFC 3986.

Support: Core

parametersRef
ParametersReference
(Optional)

ParametersRef is a reference to a resource that contains the configuration parameters corresponding to the GatewayClass. This is optional if the controller does not require any additional configuration.

ParametersRef can reference a standard Kubernetes resource, i.e. ConfigMap, or an implementation-specific custom resource. The resource can be cluster-scoped or namespace-scoped.

If the referent cannot be found, the GatewayClass’s “InvalidParameters” status condition will be true.

Support: Custom

description
string
(Optional)

Description helps describe a GatewayClass with more details.

GatewayClassStatus

(Appears on: GatewayClass)

GatewayClassStatus is the current status for the GatewayClass.

Field Description
conditions
[]Kubernetes meta/v1.Condition
(Optional)

Conditions is the current status from the controller for this GatewayClass.

Controllers should prefer to publish conditions using values of GatewayClassConditionType for the type of each Condition.

GatewayConditionReason (string alias)

GatewayConditionReason defines the set of reasons that explain why a particular Gateway condition type has been raised.

Value Description

"AddressNotAssigned"

This reason is used with the “Ready” condition when the requested address has not been assigned to the Gateway. This reason can be used to express a range of circumstances, including (but not limited to) IPAM address exhaustion, invalid or unsupported address requests, or a named address not being found.

"ListenersNotReady"

This reason is used with the “Ready” condition when one or more Listeners are not ready to serve traffic.

"ListenersNotValid"

This reason is used with the “Ready” condition when one or more Listeners have an invalid or unsupported configuration and cannot be configured on the Gateway.

"NoResources"

This reason is used with the “Scheduled” condition when the Gateway is not scheduled because insufficient infrastructure resources are available.

"NoSuchGatewayClass"

This reason is used with the “Scheduled” condition when the Gateway is not scheduled because there is no controller that recognizes the GatewayClassName. This reason has been deprecated and will be removed in a future release.

"NotReconciled"

This reason is used with the “Scheduled” condition when been recently created and no controller has reconciled it yet.

"Ready"

This reason is used with the “Ready” condition when the condition is true.

"Scheduled"

This reason is used with the “Scheduled” condition when the condition is true.

GatewayConditionType (string alias)

GatewayConditionType is a type of condition associated with a Gateway. This type should be used with the GatewayStatus.Conditions field.

Value Description

"Ready"

This condition is true when the Gateway is expected to be able to serve traffic. Note that this does not indicate that the Gateway configuration is current or even complete (e.g. the controller may still not have reconciled the latest version, or some parts of the configuration could be missing).

If both the “ListenersNotValid” and “ListenersNotReady” reasons are true, the Gateway controller should prefer the “ListenersNotValid” reason.

Possible reasons for this condition to be true are:

  • “Ready”

Possible reasons for this condition to be false are:

  • “ListenersNotValid”
  • “ListenersNotReady”
  • “AddressNotAssigned”

Controllers may raise this condition with other reasons, but should prefer to use the reasons listed above to improve interoperability.

"Scheduled"

This condition is true when the controller managing the Gateway has scheduled the Gateway to the underlying network infrastructure.

Possible reasons for this condition to be true are:

  • “Scheduled”

Possible reasons for this condition to be false are:

  • “NotReconciled”
  • “NoSuchGatewayClass”
  • “NoResources”

Controllers may raise this condition with other reasons, but should prefer to use the reasons listed above to improve interoperability.

GatewayReference

(Appears on: RouteGateways)

GatewayReference identifies a Gateway in a specified namespace.

Field Description
name
string

Name is the name of the referent.

namespace
string

Namespace is the namespace of the referent.

GatewaySpec

(Appears on: Gateway)

GatewaySpec defines the desired state of Gateway.

Not all possible combinations of options specified in the Spec are valid. Some invalid configurations can be caught synchronously via a webhook, but there are many cases that will require asynchronous signaling via the GatewayStatus block.

Field Description
gatewayClassName
string

GatewayClassName used for this Gateway. This is the name of a GatewayClass resource.

listeners
[]Listener

Listeners associated with this Gateway. Listeners define logical endpoints that are bound on this Gateway’s addresses. At least one Listener MUST be specified.

An implementation MAY group Listeners by Port and then collapse each group of Listeners into a single Listener if the implementation determines that the Listeners in the group are “compatible”. An implementation MAY also group together and collapse compatible Listeners belonging to different Gateways.

For example, an implementation might consider Listeners to be compatible with each other if all of the following conditions are met:

  1. Either each Listener within the group specifies the “HTTP” Protocol or each Listener within the group specifies either the “HTTPS” or “TLS” Protocol.

  2. Each Listener within the group specifies a Hostname that is unique within the group.

  3. As a special case, one Listener within a group may omit Hostname, in which case this Listener matches when no other Listener matches.

If the implementation does collapse compatible Listeners, the hostname provided in the incoming client request MUST be matched to a Listener to find the correct set of Routes. The incoming hostname MUST be matched using the Hostname field for each Listener in order of most to least specific. That is, exact matches must be processed before wildcard matches.

If this field specifies multiple Listeners that have the same Port value but are not compatible, the implementation must raise a “Conflicted” condition in the Listener status.

Support: Core

addresses
[]GatewayAddress
(Optional)

Addresses requested for this gateway. This is optional and behavior can depend on the GatewayClass. If a value is set in the spec and the requested address is invalid, the GatewayClass MUST indicate this in the associated entry in GatewayStatus.Addresses.

If no Addresses are specified, the GatewayClass may schedule the Gateway in an implementation-defined manner, assigning an appropriate set of Addresses.

The GatewayClass MUST bind all Listeners to every GatewayAddress that it assigns to the Gateway.

Support: Core

GatewayStatus

(Appears on: Gateway)

GatewayStatus defines the observed state of Gateway.

Field Description
addresses
[]GatewayAddress
(Optional)

Addresses lists the IP addresses that have actually been bound to the Gateway. These addresses may differ from the addresses in the Spec, e.g. if the Gateway automatically assigns an address from a reserved pool.

These addresses should all be of type “IPAddress”.

conditions
[]Kubernetes meta/v1.Condition
(Optional)

Conditions describe the current conditions of the Gateway.

Implementations should prefer to express Gateway conditions using the GatewayConditionType and GatewayConditionReason constants so that operators and tools can converge on a common vocabulary to describe Gateway state.

Known condition types are:

  • “Scheduled”
  • “Ready”
listeners
[]ListenerStatus
(Optional)

Listeners provide status for each unique listener port defined in the Spec.

GatewayTLSConfig

(Appears on: Listener)

GatewayTLSConfig describes a TLS configuration.

References:

Field Description
mode
TLSModeType
(Optional)

Mode defines the TLS behavior for the TLS session initiated by the client. There are two possible modes: - Terminate: The TLS session between the downstream client and the Gateway is terminated at the Gateway. This mode requires certificateRef to be set. - Passthrough: The TLS session is NOT terminated by the Gateway. This implies that the Gateway can’t decipher the TLS stream except for the ClientHello message of the TLS protocol. CertificateRef field is ignored in this mode.

Support: Core

certificateRef
LocalObjectReference
(Optional)

CertificateRef is a reference to a Kubernetes object that contains a TLS certificate and private key. This certificate is used to establish a TLS handshake for requests that match the hostname of the associated listener. The referenced object MUST reside in the same namespace as Gateway.

This field is required when mode is set to “Terminate” (default) and optional otherwise.

CertificateRef can reference a standard Kubernetes resource, i.e. Secret, or an implementation-specific custom resource.

Support: Core (Kubernetes Secrets)

Support: Implementation-specific (Other resource types)

routeOverride
TLSOverridePolicy
(Optional)

RouteOverride dictates if TLS settings can be configured via Routes or not.

CertificateRef must be defined even if routeOverride.certificate is set to ‘Allow’ as it will be used as the default certificate for the listener.

Support: Core

options
map[string]string
(Optional)

Options are a list of key/value pairs to give extended options to the provider.

There variation among providers as to how ciphersuites are expressed. If there is a common subset for expressing ciphers then it will make sense to loft that as a core API construct.

Support: Implementation-specific

HTTPHeader

(Appears on: HTTPRequestHeaderFilter)

HTTPHeader represents an HTTP Header name and value as defined by RFC 7230.

Field Description
name
string

Name is the name of the HTTP Header to be matched. Name matching MUST be case insensitive. (See https://tools.ietf.org/html/rfc7230#section-3.2).

If multiple entries specify equivalent header names, only the first entry with an equivalent name MUST be considered for a match. Subsequent entries with an equivalent header name MUST be ignored. Due to the case-insensitivity of header names, “foo” and “Foo” are considered equivalent.

value
string

Value is the value of HTTP Header to be matched.

HTTPHeaderMatch

(Appears on: HTTPRouteMatch)

HTTPHeaderMatch describes how to select a HTTP route by matching HTTP request headers.

Field Description
type
HeaderMatchType
(Optional)

Type specifies how to match against the value of the header.

Support: Core (Exact)

Support: Custom (RegularExpression, ImplementationSpecific)

Since RegularExpression PathType has custom conformance, implementations can support POSIX, PCRE or any other dialects of regular expressions. Please read the implementation’s documentation to determine the supported dialect.

name
string

Name is the name of the HTTP Header to be matched. Name matching MUST be case insensitive. (See https://tools.ietf.org/html/rfc7230#section-3.2).

If multiple entries specify equivalent header names, only the first entry with an equivalent name MUST be considered for a match. Subsequent entries with an equivalent header name MUST be ignored. Due to the case-insensitivity of header names, “foo” and “Foo” are considered equivalent.

value
string

Value is the value of HTTP Header to be matched.

HTTPPathMatch

(Appears on: HTTPRouteMatch)

HTTPPathMatch describes how to select a HTTP route by matching the HTTP request path.

Field Description
type
PathMatchType
(Optional)

Type specifies how to match against the path Value.

Support: Core (Exact, Prefix)

Support: Custom (RegularExpression, ImplementationSpecific)

Since RegularExpression PathType has custom conformance, implementations can support POSIX, PCRE or any other dialects of regular expressions. Please read the implementation’s documentation to determine the supported dialect.

value
string
(Optional)

Value of the HTTP path to match against.

HTTPQueryParamMatch

(Appears on: HTTPRouteMatch)

HTTPQueryParamMatch describes how to select a HTTP route by matching HTTP query parameters.

Field Description
type
QueryParamMatchType
(Optional)

Type specifies how to match against the value of the query parameter.

Support: Extended (Exact)

Support: Custom (RegularExpression, ImplementationSpecific)

Since RegularExpression QueryParamMatchType has custom conformance, implementations can support POSIX, PCRE or any other dialects of regular expressions. Please read the implementation’s documentation to determine the supported dialect.

name
string

Name is the name of the HTTP query param to be matched. This must be an exact string match. (See https://tools.ietf.org/html/rfc7230#section-2.7.3).

value
string

Value is the value of HTTP query param to be matched.

HTTPRequestHeaderFilter

(Appears on: HTTPRouteFilter)

HTTPRequestHeaderFilter defines configuration for the RequestHeaderModifier filter.

Field Description
set
[]HTTPHeader
(Optional)

Set overwrites the request with the given header (name, value) before the action.

Input: GET /foo HTTP/1.1 my-header: foo

Config: set: {“my-header”: “bar”}

Output: GET /foo HTTP/1.1 my-header: bar

add
[]HTTPHeader
(Optional)

Add adds the given header(s) (name, value) to the request before the action. It appends to any existing values associated with the header name.

Input: GET /foo HTTP/1.1 my-header: foo

Config: add: {“my-header”: “bar”}

Output: GET /foo HTTP/1.1 my-header: foo my-header: bar

remove
[]string
(Optional)

Remove the given header(s) from the HTTP request before the action. The value of RemoveHeader is a list of HTTP header names. Note that the header names are case-insensitive (see https://datatracker.ietf.org/doc/html/rfc2616#section-4.2).

Input: GET /foo HTTP/1.1 my-header1: foo my-header2: bar my-header3: baz

Config: remove: [“my-header1”, “my-header3”]

Output: GET /foo HTTP/1.1 my-header2: bar

HTTPRequestMirrorFilter

(Appears on: HTTPRouteFilter)

HTTPRequestMirrorFilter defines configuration for the RequestMirror filter.

Field Description
serviceName
string
(Optional)

ServiceName refers to the name of the Service to mirror matched requests to. When specified, this takes the place of BackendRef. If both BackendRef and ServiceName are specified, ServiceName will be given precedence.

If the referent cannot be found, the rule is not included in the route. The controller should raise the “ResolvedRefs” condition on the Gateway with the “DegradedRoutes” reason. The gateway status for this route should be updated with a condition that describes the error more specifically.

Support: Core

backendRef
LocalObjectReference
(Optional)

BackendRef is a local object reference to mirror matched requests to. If both BackendRef and ServiceName are specified, ServiceName will be given precedence.

If the referent cannot be found, the rule is not included in the route. The controller should raise the “ResolvedRefs” condition on the Gateway with the “DegradedRoutes” reason. The gateway status for this route should be updated with a condition that describes the error more specifically.

Support: Custom

port
PortNumber
(Optional)

Port specifies the destination port number to use for the backend referenced by the ServiceName or BackendRef field.

If unspecified, the destination port in the request is used when forwarding to a backendRef or serviceName.

HTTPRequestRedirect

(Appears on: HTTPRouteFilter)

HTTPRequestRedirect defines configuration for the RequestRedirect filter.

Field Description
protocol
string
(Optional)

Protocol is the protocol to be used in the value of the Location header in the response. When empty, the protocol of the request is used.

Support: Extended

hostname
string
(Optional)

Hostname is the hostname to be used in the value of the Location header in the response. When empty, the hostname of the request is used.

Support: Core

port
int
(Optional)

Port is the port to be used in the value of the Location header in the response. When empty, port (if specified) of the request is used.

Support: Extended

statusCode
int
(Optional)

StatusCode is the HTTP status code to be used in response.

Support: Core

HTTPRouteFilter

(Appears on: HTTPRouteForwardTo, HTTPRouteRule)

HTTPRouteFilter defines additional processing steps that must be completed during the request or response lifecycle. HTTPRouteFilters are meant as an extension point to express additional processing that may be done in Gateway implementations. Some examples include request or response modification, implementing authentication strategies, rate-limiting, and traffic shaping. API guarantee/conformance is defined based on the type of the filter. TODO(hbagdi): re-render CRDs once controller-tools supports union tags: - https://github.com/kubernetes-sigs/controller-tools/pull/298 - https://github.com/kubernetes-sigs/controller-tools/issues/461

Field Description
type
HTTPRouteFilterType

Type identifies the type of filter to apply. As with other API fields, types are classified into three conformance levels:

  • Core: Filter types and their corresponding configuration defined by “Support: Core” in this package, e.g. “RequestHeaderModifier”. All implementations must support core filters.

  • Extended: Filter types and their corresponding configuration defined by “Support: Extended” in this package, e.g. “RequestMirror”. Implementers are encouraged to support extended filters.

  • Custom: Filters that are defined and supported by specific vendors. In the future, filters showing convergence in behavior across multiple implementations will be considered for inclusion in extended or core conformance levels. Filter-specific configuration for such filters is specified using the ExtensionRef field. Type should be set to “ExtensionRef” for custom filters.

Implementers are encouraged to define custom implementation types to extend the core API with implementation-specific behavior.

requestHeaderModifier
HTTPRequestHeaderFilter
(Optional)

RequestHeaderModifier defines a schema for a filter that modifies request headers.

Support: Core

requestMirror
HTTPRequestMirrorFilter
(Optional)

RequestMirror defines a schema for a filter that mirrors requests.

Support: Extended

requestRedirect
HTTPRequestRedirect
(Optional)

RequestRedirect defines a schema for a filter that redirects request.

Support: Core

extensionRef
LocalObjectReference
(Optional)

ExtensionRef is an optional, implementation-specific extension to the “filter” behavior. For example, resource “myroutefilter” in group “networking.acme.io”). ExtensionRef MUST NOT be used for core and extended filters.

Support: Implementation-specific

HTTPRouteFilterType (string alias)

(Appears on: HTTPRouteFilter)

HTTPRouteFilterType identifies a type of HTTPRoute filter.

Value Description

"ExtensionRef"

HTTPRouteFilterExtensionRef should be used for configuring custom HTTP filters.

Support in HTTPRouteRule: Custom

Support in HTTPRouteForwardTo: Custom

"RequestHeaderModifier"

HTTPRouteFilterRequestHeaderModifier can be used to add or remove an HTTP header from an HTTP request before it is sent to the upstream target.

Support in HTTPRouteRule: Core

Support in HTTPRouteForwardTo: Extended

"RequestMirror"

HTTPRouteFilterRequestMirror can be used to mirror HTTP requests to a different backend. The responses from this backend MUST be ignored by the Gateway.

Support in HTTPRouteRule: Extended

Support in HTTPRouteForwardTo: Extended

"RequestRedirect"

HTTPRouteFilterRequestRedirect can be used to redirect a request to another location. This filter can also be used for HTTP to HTTPS redirects.

Support in HTTPRouteRule: Core

Support in HTTPRouteForwardTo: Extended

HTTPRouteForwardTo

(Appears on: HTTPRouteRule)

HTTPRouteForwardTo defines how a HTTPRoute should forward a request.

Field Description
serviceName
string
(Optional)

ServiceName refers to the name of the Service to forward matched requests to. When specified, this takes the place of BackendRef. If both BackendRef and ServiceName are specified, ServiceName will be given precedence.

If the referent cannot be found, the route must be dropped from the Gateway. The controller should raise the “ResolvedRefs” condition on the Gateway with the “DegradedRoutes” reason. The gateway status for this route should be updated with a condition that describes the error more specifically.

The protocol to use should be specified with the AppProtocol field on Service resources.

Support: Core

backendRef
LocalObjectReference
(Optional)

BackendRef is a reference to a backend to forward matched requests to. If both BackendRef and ServiceName are specified, ServiceName will be given precedence.

If the referent cannot be found, the route must be dropped from the Gateway. The controller should raise the “ResolvedRefs” condition on the Gateway with the “DegradedRoutes” reason. The gateway status for this route should be updated with a condition that describes the error more specifically.

Support: Custom

port
PortNumber
(Optional)

Port specifies the destination port number to use for the backend referenced by the ServiceName or BackendRef field. If unspecified, the destination port in the request is used when forwarding to a backendRef or serviceName.

Support: Core

weight
int32
(Optional)

Weight specifies the proportion of HTTP requests forwarded to the backend referenced by the ServiceName or BackendRef field. This is computed as weight/(sum of all weights in this ForwardTo list). For non-zero values, there may be some epsilon from the exact proportion defined here depending on the precision an implementation supports. Weight is not a percentage and the sum of weights does not need to equal 100.

If only one backend is specified and it has a weight greater than 0, 100% of the traffic is forwarded to that backend. If weight is set to 0, traffic must not be forwarded for this entry. If unspecified, weight defaults to 1.

Support: Core

filters
[]HTTPRouteFilter
(Optional)

Filters defined at this-level should be executed if and only if the request is being forwarded to the backend defined here.

Support: Custom (For broader support of filters, use the Filters field in HTTPRouteRule.)

HTTPRouteMatch

(Appears on: HTTPRouteRule)

HTTPRouteMatch defines the predicate used to match requests to a given action. Multiple match types are ANDed together, i.e. the match will evaluate to true only if all conditions are satisfied.

For example, the match below will match a HTTP request only if its path starts with /foo AND it contains the version: "1" header:

match:
path:
value: "/foo"
headers:
values:
version: "1"

Field Description
path
HTTPPathMatch
(Optional)

Path specifies a HTTP request path matcher. If this field is not specified, a default prefix match on the “/” path is provided.

headers
[]HTTPHeaderMatch
(Optional)

Headers specifies HTTP request header matchers. Multiple match values are ANDed together, meaning, a request must match all the specified headers to select the route.

queryParams
[]HTTPQueryParamMatch
(Optional)

QueryParams specifies HTTP query parameter matchers. Multiple match values are ANDed together, meaning, a request must match all the specified query parameters to select the route.

extensionRef
LocalObjectReference
(Optional)

ExtensionRef is an optional, implementation-specific extension to the “match” behavior. For example, resource “myroutematcher” in group “networking.acme.io”. If the referent cannot be found, the rule is not included in the route. The controller should raise the “ResolvedRefs” condition on the Gateway with the “DegradedRoutes” reason. The gateway status for this route should be updated with a condition that describes the error more specifically.

Support: Custom

HTTPRouteRule

(Appears on: HTTPRouteSpec)

HTTPRouteRule defines semantics for matching an HTTP request based on conditions, optionally executing additional processing steps, and forwarding the request to an API object.

Field Description
matches
[]HTTPRouteMatch
(Optional)

Matches define conditions used for matching the rule against incoming HTTP requests. Each match is independent, i.e. this rule will be matched if any one of the matches is satisfied.

For example, take the following matches configuration:

matches:
- path:
value: "/foo"
headers:
values:
version: "2"
- path:
value: "/v2/foo"

For a request to match against this rule, a request should satisfy EITHER of the two conditions:

  • path prefixed with /foo AND contains the header version: "2"
  • path prefix of /v2/foo

See the documentation for HTTPRouteMatch on how to specify multiple match conditions that should be ANDed together.

If no matches are specified, the default is a prefix path match on “/”, which has the effect of matching every HTTP request.

Each client request MUST map to a maximum of one route rule. If a request matches multiple rules, matching precedence MUST be determined in order of the following criteria, continuing on ties:

  • The longest matching hostname.
  • The longest matching path.
  • The largest number of header matches.

If ties still exist across multiple Routes, matching precedence MUST be determined in order of the following criteria, continuing on ties:

  • The oldest Route based on creation timestamp. For example, a Route with a creation timestamp of “2020-09-08 01:02:03” is given precedence over a Route with a creation timestamp of “2020-09-08 01:02:04”.
  • The Route appearing first in alphabetical order by “/”. For example, foo/bar is given precedence over foo/baz.

If ties still exist within the Route that has been given precedence, matching precedence MUST be granted to the first matching rule meeting the above criteria.

filters
[]HTTPRouteFilter
(Optional)

Filters define the filters that are applied to requests that match this rule.

The effects of ordering of multiple behaviors are currently unspecified. This can change in the future based on feedback during the alpha stage.

Conformance-levels at this level are defined based on the type of filter:

  • ALL core filters MUST be supported by all implementations.
  • Implementers are encouraged to support extended filters.
  • Implementation-specific custom filters have no API guarantees across implementations.

Specifying a core filter multiple times has unspecified or custom conformance.

Support: Core

forwardTo
[]HTTPRouteForwardTo
(Optional)

ForwardTo defines the backend(s) where matching requests should be sent. If unspecified, the rule performs no forwarding. If unspecified and no filters are specified that would result in a response being sent, a 503 error code is returned.

HTTPRouteSpec

(Appears on: HTTPRoute)

HTTPRouteSpec defines the desired state of HTTPRoute

Field Description
gateways
RouteGateways
(Optional)

Gateways defines which Gateways can use this Route.

hostnames
[]Hostname
(Optional)

Hostnames defines a set of hostname that should match against the HTTP Host header to select a HTTPRoute to process the request. Hostname is the fully qualified domain name of a network host, as defined by RFC 3986. Note the following deviations from the “host” part of the URI as defined in the RFC:

  1. IPs are not allowed.
  2. The : delimiter is not respected because ports are not allowed.

Incoming requests are matched against the hostnames before the HTTPRoute rules. If no hostname is specified, traffic is routed based on the HTTPRouteRules.

Requests will be matched against the Host field in the following order:

  1. If Hostname is precise, the request matches this rule if the HTTP Host header is equal to the Hostname.
  2. If Hostname is a wildcard, then the request matches this rule if the HTTP Host header is to equal to the suffix (removing the first label) of the wildcard rule.
  3. If Hostname is unspecified, empty, or *, then any request will match this route.

If a hostname is specified by the Listener that the HTTPRoute is bound to, at least one hostname specified here must match the Listener specified hostname as per the rules above. Other hostnames will not affect processing of the route in that case.

If no hostname is specified by the Listener, then that value will be treated as ‘*’, match any hostname, and so any hostname on this Route will match.

If all hostnames do not match, then the HTTPRoute is not admitted, and the implementation must raise an ‘Admitted’ Condition with a status of false for that Listener.

Examples: - A Listener with unspecified, empty, or * values for Hostname matches any HTTPRoute hostname. - A HTTPRoute with unspecified, empty, or * values for Hostname matches any Listener hostname. - A Listener with test.foo.com as the hostname matches only test.foo.com or *.foo.com. Any other hostnames present must be ignored. - A Listener with *.foo.com as hostname, all hostnames in the HTTPRoute must have any single label where the star is, and the rest of the hostname must match exactly. So, test.foo.com, *.foo.com or blog.foo.com match. test.blog.foo.com, test.bar.com, or bar.com do not. Hostnames that do not match will be ignored.

Support: Core

tls
RouteTLSConfig
(Optional)

TLS defines the TLS certificate to use for Hostnames defined in this Route. This configuration only takes effect if the AllowRouteOverride field is set to true in the associated Gateway resource.

Collisions can happen if multiple HTTPRoutes define a TLS certificate for the same hostname. In such a case, conflict resolution guiding principles apply, specifically, if hostnames are same and two different certificates are specified then the certificate in the oldest resource wins.

Please note that HTTP Route-selection takes place after the TLS Handshake (ClientHello). Due to this, TLS certificate defined here will take precedence even if the request has the potential to match multiple routes (in case multiple HTTPRoutes share the same hostname).

Support: Core

rules
[]HTTPRouteRule
(Optional)

Rules are a list of HTTP matchers, filters and actions.

HTTPRouteStatus

(Appears on: HTTPRoute)

HTTPRouteStatus defines the observed state of HTTPRoute.

Field Description
RouteStatus
RouteStatus

(Members of RouteStatus are embedded into this type.)

HeaderMatchType (string alias)

(Appears on: HTTPHeaderMatch)

HeaderMatchType specifies the semantics of how HTTP header values should be compared. Valid HeaderMatchType values are:

  • “Exact”
  • “RegularExpression”
  • “ImplementationSpecific”

Value Description

"Exact"

"ImplementationSpecific"

"RegularExpression"

Hostname (string alias)

(Appears on: HTTPRouteSpec, Listener, ListenerStatus, TLSRouteSpec)

Hostname is the fully qualified domain name of a network host, as defined by RFC 3986. Note the following deviations from the “host” part of the URI as defined in the RFC:

  1. IP literals are not allowed.
  2. The : delimiter is not respected because ports are not allowed.

Hostname can be “precise” which is a domain name without the terminating dot of a network host (e.g. “foo.example.com”) or “wildcard”, which is a domain name prefixed with a single wildcard label (e.g. *.example.com). The wildcard character * must appear by itself as the first DNS label and matches only a single label.

Note that as per RFC1035 and RFC1123, a label must consist of lower case alphanumeric characters or ‘-’, and must start and end with an alphanumeric character. No other punctuation is allowed.

Listener

(Appears on: GatewaySpec)

Listener embodies the concept of a logical endpoint where a Gateway can accept network connections. Each listener in a Gateway must have a unique combination of Hostname, Port, and Protocol. This will be enforced by a validating webhook.

Field Description
hostname
Hostname
(Optional)

Hostname specifies the virtual hostname to match for protocol types that define this concept. When unspecified, “”, or *, all hostnames are matched. This field can be omitted for protocols that don’t require hostname based matching.

For HTTPRoute objects, there is an interaction with the spec.hostnames array. When both listener and route specify hostnames, there must be an intersection between the values for a Route to be admitted. For example, a Gateway with *.example.com would admit a Route that included foo.example.com as a hostname, but not a Route that only included foo.acme.io as a hostname. A Route that included both foo.example.com and foo.acme.io would be admitted, but the foo.acme.io hostname would be silently ignored.

Support: Core

port
PortNumber

Port is the network port. Multiple listeners may use the same port, subject to the Listener compatibility rules.

Support: Core

protocol
ProtocolType

Protocol specifies the network protocol this listener expects to receive. The GatewayClass MUST apply the Hostname match appropriately for each protocol:

  • For the “TLS” protocol, the Hostname match MUST be applied to the SNI server name offered by the client.
  • For the “HTTP” protocol, the Hostname match MUST be applied to the host portion of the effective request URI or the :authority pseudo-header
  • For the “HTTPS” protocol, the Hostname match MUST be applied at both the TLS and HTTP protocol layers.

Support: Core

tls
GatewayTLSConfig
(Optional)

TLS is the TLS configuration for the Listener. This field is required if the Protocol field is “HTTPS” or “TLS” and ignored otherwise.

The association of SNIs to Certificate defined in GatewayTLSConfig is defined based on the Hostname field for this listener.

The GatewayClass MUST use the longest matching SNI out of all available certificates for any TLS handshake.

Support: Core

routes
RouteBindingSelector

Routes specifies a schema for associating routes with the Listener using selectors. A Route is a resource capable of servicing a request and allows a cluster operator to expose a cluster resource (i.e. Service) by externally-reachable URL, load-balance traffic and terminate SSL/TLS. Typically, a route is a “HTTPRoute” or “TCPRoute” in group “gateway.networking.k8s.io”, however, an implementation may support other types of resources.

The Routes selector MUST select a set of objects that are compatible with the application protocol specified in the Protocol field.

Although a client request may technically match multiple route rules, only one rule may ultimately receive the request. Matching precedence MUST be determined in order of the following criteria:

  • The most specific match. For example, the most specific HTTPRoute match is determined by the longest matching combination of hostname and path.
  • The oldest Route based on creation timestamp. For example, a Route with a creation timestamp of “2020-09-08 01:02:03” is given precedence over a Route with a creation timestamp of “2020-09-08 01:02:04”.
  • If everything else is equivalent, the Route appearing first in alphabetical order (namespace/name) should be given precedence. For example, foo/bar is given precedence over foo/baz.

All valid portions of a Route selected by this field should be supported. Invalid portions of a Route can be ignored (sometimes that will mean the full Route). If a portion of a Route transitions from valid to invalid, support for that portion of the Route should be dropped to ensure consistency. For example, even if a filter specified by a Route is invalid, the rest of the Route should still be supported.

Support: Core

ListenerConditionReason (string alias)

ListenerConditionReason defines the set of reasons that explain why a particular Listener condition type has been raised.

Value Description

"Attached"

This reason is used with the “Detached” condition when the condition is false.

"DegradedRoutes"

This reason is used with the “ResolvedRefs” condition when not all of the routes selected by this Listener could be configured. The specific reason for the degraded route should be indicated in the route’s .Status.Conditions field.

"HostnameConflict"

This reason is used with the “Conflicted” condition when the Listener conflicts with hostnames in other Listeners. For example, this reason would be used when multiple Listeners on the same port use * in the hostname field.

"Invalid"

This reason is used with the “Ready” condition when the Listener is syntactically or semantically invalid.

"InvalidCertificateRef"

This reason is used with the “ResolvedRefs” condition when the Listener has a TLS configuration with a TLS CertificateRef that is invalid or cannot be resolved.

"InvalidRoutesRef"

This reason is used with the “ResolvedRefs” condition when the Listener’s Routes selector or kind is invalid or cannot be resolved. Note that it is not an error for this selector to not resolve any Routes, and the “ResolvedRefs” status condition should not be raised in that case.

"NoConflicts"

This reason is used with the “Conflicted” condition when the condition is false.

"Pending"

This reason is used with the “Ready” condition when the Listener is not yet not online and ready to accept client traffic.

"PortUnavailable"

This reason is used with the “Detached” condition when the Listener requests a port that cannot be used on the Gateway.

"ProtocolConflict"

This reason is used with the “Conflicted” condition when multiple Listeners are specified with the same Listener port number, but have conflicting protocol specifications.

"Ready"

This reason is used with the “Ready” condition when the condition is true.

"ResolvedRefs"

This reason is used with the “ResolvedRefs” condition when the condition is true.

"RouteConflict"

This reason is used with the “Conflicted” condition when the route resources selected for this Listener conflict with other specified properties of the Listener (e.g. Protocol). For example, a Listener that specifies “UDP” as the protocol but a route selector that resolves “TCPRoute” objects.

"UnsupportedAddress"

This reason is used with the “Detached” condition when the Listener could not be attached to the Gateway because the requested address is not supported.

"UnsupportedExtension"

This reason is used with the “Detached” condition when the controller detects that an implementation-specific Listener extension is being requested, but is not able to support the extension.

"UnsupportedProtocol"

This reason is used with the “Detached” condition when the Listener could not be attached to be Gateway because its protocol type is not supported.

ListenerConditionType (string alias)

ListenerConditionType is a type of condition associated with the listener. This type should be used with the ListenerStatus.Conditions field.

Value Description

"Conflicted"

This condition indicates that the controller was unable to resolve conflicting specification requirements for this Listener. If a Listener is conflicted, its network port should not be configured on any network elements.

Possible reasons for this condition to be true are:

  • “HostnameConflict”
  • “ProtocolConflict”
  • “RouteConflict”

Possible reasons for this condition to be false are:

  • “NoConflicts”

Controllers may raise this condition with other reasons, but should prefer to use the reasons listed above to improve interoperability.

"Detached"

This condition indicates that, even though the listener is syntactically and semantically valid, the controller is not able to configure it on the underlying Gateway infrastructure.

A Listener is specified as a logical requirement, but needs to be configured on a network endpoint (i.e. address and port) by a controller. The controller may be unable to attach the Listener if it specifies an unsupported requirement, or prerequisite resources are not available.

Possible reasons for this condition to be true are:

  • “PortUnavailable”
  • “UnsupportedExtension”
  • “UnsupportedProtocol”
  • “UnsupportedAddress”

Possible reasons for this condition to be false are:

  • “Attached”

Controllers may raise this condition with other reasons, but should prefer to use the reasons listed above to improve interoperability.

"Ready"

This condition indicates whether the Listener has been configured on the Gateway.

Possible reasons for this condition to be true are:

  • “Ready”

Possible reasons for this condition to be false are:

  • “Invalid”
  • “Pending”

Controllers may raise this condition with other reasons, but should prefer to use the reasons listed above to improve interoperability.

"ResolvedRefs"

This condition indicates whether the controller was able to resolve all the object references for the Listener.

Possible reasons for this condition to be true are:

  • “ResolvedRefs”

Possible reasons for this condition to be false are:

  • “DegradedRoutes”
  • “InvalidCertificateRef”
  • “InvalidRoutesRef”

Controllers may raise this condition with other reasons, but should prefer to use the reasons listed above to improve interoperability.

ListenerStatus

(Appears on: GatewayStatus)

ListenerStatus is the status associated with a Listener.

Field Description
port
PortNumber

Port is the unique Listener port value for which this message is reporting the status.

protocol
ProtocolType

Protocol is the Listener protocol value for which this message is reporting the status.

hostname
Hostname
(Optional)

Hostname is the Listener hostname value for which this message is reporting the status.

conditions
[]Kubernetes meta/v1.Condition

Conditions describe the current condition of this listener.

LocalObjectReference

(Appears on: GatewayTLSConfig, HTTPRequestMirrorFilter, HTTPRouteFilter, HTTPRouteForwardTo, HTTPRouteMatch, RouteForwardTo, RouteTLSConfig, TCPRouteMatch, TLSRouteMatch, UDPRouteMatch)

LocalObjectReference identifies an API object within the namespace of the referrer.

Field Description
group
string

Group is the group of the referent.

kind
string

Kind is kind of the referent.

name
string

Name is the name of the referent.

ParametersReference

(Appears on: GatewayClassSpec)

ParametersReference identifies an API object containing controller-specific configuration resource within the cluster.

Field Description
group
string

Group is the group of the referent.

kind
string

Kind is kind of the referent.

name
string

Name is the name of the referent.

scope
string
(Optional)

Scope represents if the referent is a Cluster or Namespace scoped resource. This may be set to “Cluster” or “Namespace”.

namespace
string
(Optional)

Namespace is the namespace of the referent. This field is required when scope is set to “Namespace” and ignored when scope is set to “Cluster”.

PathMatchType (string alias)

(Appears on: HTTPPathMatch)

PathMatchType specifies the semantics of how HTTP paths should be compared. Valid PathMatchType values are:

  • “Exact”
  • “Prefix”
  • “RegularExpression”
  • “ImplementationSpecific”

Prefix and Exact paths must be syntactically valid:

  • Must begin with the ‘/’ character
  • Must not contain consecutive ‘/’ characters (e.g. /foo///, //).
  • For prefix paths, a trailing ‘/’ character in the Path is ignored, e.g. /abc and /abc/ specify the same match.

Value Description

"Exact"

"ImplementationSpecific"

"Prefix"

"RegularExpression"

PortNumber (int32 alias)

(Appears on: HTTPRequestMirrorFilter, HTTPRouteForwardTo, Listener, ListenerStatus, RouteForwardTo)

PortNumber defines a network port.

ProtocolType (string alias)

(Appears on: Listener, ListenerStatus)

ProtocolType defines the application protocol accepted by a Listener. Implementations are not required to accept all the defined protocols. If an implementation does not support a specified protocol, it should raise a “Detached” condition for the affected Listener with a reason of “UnsupportedProtocol”.

Core ProtocolType values are listed in the table below.

Implementations can define their own protocols if a core ProtocolType does not exist. Such definitions must use prefixed name, such as mycompany.com/my-custom-protocol. Un-prefixed names are reserved for core protocols. Any protocol defined by implementations will fall under custom conformance.

Value Description

"HTTP"

Accepts cleartext HTTP/1.1 sessions over TCP.

"HTTPS"

Accepts HTTP/1.1 or HTTP/2 sessions over TLS.

"TCP"

Accepts TCP sessions.

"TLS"

Accepts TLS sessions over TCP.

"UDP"

Accepts UDP packets.

QueryParamMatchType (string alias)

(Appears on: HTTPQueryParamMatch)

QueryParamMatchType specifies the semantics of how HTTP query parameter values should be compared. Valid QueryParamMatchType values are:

  • “Exact”
  • “RegularExpression”
  • “ImplementationSpecific”

Value Description

"Exact"

"ImplementationSpecific"

"RegularExpression"

RouteBindingSelector

(Appears on: Listener)

RouteBindingSelector defines a schema for associating routes with the Gateway. If Namespaces and Selector are defined, only routes matching both selectors are associated with the Gateway.

Field Description
namespaces
RouteNamespaces
(Optional)

Namespaces indicates in which namespaces Routes should be selected for this Gateway. This is restricted to the namespace of this Gateway by default.

Support: Core

selector
Kubernetes meta/v1.LabelSelector
(Optional)

Selector specifies a set of route labels used for selecting routes to associate with the Gateway. If this Selector is defined, only routes matching the Selector are associated with the Gateway. An empty Selector matches all routes.

Support: Core

group
string
(Optional)

Group is the group of the route resource to select. Omitting the value indicates the gateway.networking.k8s.io API group. For example, use the following to select an HTTPRoute:

routes: kind: HTTPRoute

Otherwise, if an alternative API group is desired, specify the desired group:

routes: group: acme.io kind: FooRoute

Support: Core

kind
string

Kind is the kind of the route resource to select.

Kind MUST correspond to kinds of routes that are compatible with the application protocol specified in the Listener’s Protocol field.

If an implementation does not support or recognize this resource type, it SHOULD set the “ResolvedRefs” condition to false for this listener with the “InvalidRoutesRef” reason.

Support: Core

RouteConditionType (string alias)

RouteConditionType is a type of condition for a route.

Value Description

"Admitted"

This condition indicates whether the route has been admitted or rejected by a Gateway, and why.

RouteForwardTo

(Appears on: TCPRouteRule, TLSRouteRule, UDPRouteRule)

RouteForwardTo defines how a Route should forward a request.

Field Description
serviceName
string
(Optional)

ServiceName refers to the name of the Service to forward matched requests to. When specified, this takes the place of BackendRef. If both BackendRef and ServiceName are specified, ServiceName will be given precedence.

If the referent cannot be found, the rule is not included in the route. The controller should raise the “ResolvedRefs” condition on the Gateway with the “DegradedRoutes” reason. The gateway status for this route should be updated with a condition that describes the error more specifically.

The protocol to use should be specified with the AppProtocol field on Service resources.

Support: Core

backendRef
LocalObjectReference
(Optional)

BackendRef is a reference to a backend to forward matched requests to. If both BackendRef and ServiceName are specified, ServiceName will be given precedence.

If the referent cannot be found, the rule is not included in the route. The controller should raise the “ResolvedRefs” condition on the Gateway with the “DegradedRoutes” reason. The gateway status for this route should be updated with a condition that describes the error more specifically.

Support: Custom

port
PortNumber
(Optional)

Port specifies the destination port number to use for the backend referenced by the ServiceName or BackendRef field. If unspecified, the destination port in the request is used when forwarding to a backendRef or serviceName.

Support: Core

weight
int32
(Optional)

Weight specifies the proportion of HTTP requests forwarded to the backend referenced by the ServiceName or BackendRef field. This is computed as weight/(sum of all weights in this ForwardTo list). For non-zero values, there may be some epsilon from the exact proportion defined here depending on the precision an implementation supports. Weight is not a percentage and the sum of weights does not need to equal 100.

If only one backend is specified and it has a weight greater than 0, 100% of the traffic is forwarded to that backend. If weight is set to 0, no traffic should be forwarded for this entry. If unspecified, weight defaults to 1.

Support: Extended

RouteGatewayStatus

(Appears on: RouteStatus)

RouteGatewayStatus describes the status of a route with respect to an associated Gateway.

Field Description
gatewayRef
RouteStatusGatewayReference

GatewayRef is a reference to a Gateway object that is associated with the route.

conditions
[]Kubernetes meta/v1.Condition

Conditions describes the status of the route with respect to the Gateway. The “Admitted” condition must always be specified by controllers to indicate whether the route has been admitted or rejected by the Gateway, and why. Note that the route’s availability is also subject to the Gateway’s own status conditions and listener status.

RouteGateways

(Appears on: HTTPRouteSpec, TCPRouteSpec, TLSRouteSpec, UDPRouteSpec)

RouteGateways defines which Gateways will be able to use a route. If this field results in preventing the selection of a Route by a Gateway, an “Admitted” condition with a status of false must be set for the Gateway on that Route.

Field Description
allow
GatewayAllowType
(Optional)

Allow indicates which Gateways will be allowed to use this route. Possible values are: * All: Gateways in any namespace can use this route. * FromList: Only Gateways specified in GatewayRefs may use this route. * SameNamespace: Only Gateways in the same namespace may use this route.

gatewayRefs
[]GatewayReference
(Optional)

GatewayRefs must be specified when Allow is set to “FromList”. In that case, only Gateways referenced in this list will be allowed to use this route. This field is ignored for other values of “Allow”.

RouteNamespaces

(Appears on: RouteBindingSelector)

RouteNamespaces indicate which namespaces Routes should be selected from.

Field Description
from
RouteSelectType
(Optional)

From indicates where Routes will be selected for this Gateway. Possible values are: * All: Routes in all namespaces may be used by this Gateway. * Selector: Routes in namespaces selected by the selector may be used by this Gateway. * Same: Only Routes in the same namespace may be used by this Gateway.

Support: Core

selector
Kubernetes meta/v1.LabelSelector
(Optional)

Selector must be specified when From is set to “Selector”. In that case, only Routes in Namespaces matching this Selector will be selected by this Gateway. This field is ignored for other values of “From”.

Support: Core

RouteSelectType (string alias)

(Appears on: RouteNamespaces)

RouteSelectType specifies where Routes should be selected by a Gateway.

Value Description

"All"

Routes in all namespaces may be used by this Gateway.

"Same"

Only Routes in the same namespace as the Gateway may be used by this Gateway.

"Selector"

Only Routes in namespaces selected by the selector may be used by this Gateway.

RouteStatus

(Appears on: HTTPRouteStatus, TCPRouteStatus, TLSRouteStatus, UDPRouteStatus)

RouteStatus defines the observed state that is required across all route types.

Field Description
gateways
[]RouteGatewayStatus

Gateways is a list of Gateways that are associated with the route, and the status of the route with respect to each Gateway. When a Gateway selects this route, the controller that manages the Gateway must add an entry to this list when the controller first sees the route and should update the entry as appropriate when the route is modified.

A maximum of 100 Gateways will be represented in this list. If this list is full, there may be additional Gateways using this Route that are not included in the list. An empty list means the route has not been admitted by any Gateway.

RouteStatusGatewayReference

(Appears on: RouteGatewayStatus)

RouteStatusGatewayReference identifies a Gateway in a specified namespace. This reference also includes a controller name to simplify cleaning up status entries.

Field Description
name
string

Name is the name of the referent.

namespace
string

Namespace is the namespace of the referent.

controller
string

Controller is a domain/path string that indicates the controller implementing the Gateway. This corresponds with the controller field on GatewayClass.

Example: “acme.io/gateway-controller”.

The format of this field is DOMAIN “/” PATH, where DOMAIN and PATH are valid Kubernetes names (https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names).

RouteTLSConfig

(Appears on: HTTPRouteSpec)

RouteTLSConfig describes a TLS configuration defined at the Route level.

Field Description
certificateRef
LocalObjectReference

CertificateRef is a reference to a Kubernetes object that contains a TLS certificate and private key. This certificate is used to establish a TLS handshake for requests that match the hostname of the associated HTTPRoute. The referenced object MUST reside in the same namespace as HTTPRoute.

This field is required when the TLS configuration mode of the associated Gateway listener is set to “Passthrough”.

CertificateRef can reference a standard Kubernetes resource, i.e. Secret, or an implementation-specific custom resource.

Support: Core (Kubernetes Secrets)

Support: Implementation-specific (Other resource types)

TCPRouteMatch

(Appears on: TCPRouteRule)

TCPRouteMatch defines the predicate used to match connections to a given action.

Field Description
extensionRef
LocalObjectReference
(Optional)

ExtensionRef is an optional, implementation-specific extension to the “match” behavior. For example, resource “mytcproutematcher” in group “networking.acme.io”. If the referent cannot be found, the rule is not included in the route. The controller should raise the “ResolvedRefs” condition on the Gateway with the “DegradedRoutes” reason. The gateway status for this route should be updated with a condition that describes the error more specifically.

Support: Custom

TCPRouteRule

(Appears on: TCPRouteSpec)

TCPRouteRule is the configuration for a given rule.

Field Description
matches
[]TCPRouteMatch
(Optional)

Matches define conditions used for matching the rule against incoming TCP connections. Each match is independent, i.e. this rule will be matched if any one of the matches is satisfied. If unspecified (i.e. empty), this Rule will match all requests for the associated Listener.

Each client request MUST map to a maximum of one route rule. If a request matches multiple rules, matching precedence MUST be determined in order of the following criteria, continuing on ties:

  • The most specific match specified by ExtensionRef. Each implementation that supports ExtensionRef may have different ways of determining the specificity of the referenced extension.

If ties still exist across multiple Routes, matching precedence MUST be determined in order of the following criteria, continuing on ties:

  • The oldest Route based on creation timestamp. For example, a Route with a creation timestamp of “2020-09-08 01:02:03” is given precedence over a Route with a creation timestamp of “2020-09-08 01:02:04”.
  • The Route appearing first in alphabetical order by “/”. For example, foo/bar is given precedence over foo/baz.

If ties still exist within the Route that has been given precedence, matching precedence MUST be granted to the first matching rule meeting the above criteria.

forwardTo
[]RouteForwardTo

ForwardTo defines the backend(s) where matching requests should be sent.

TCPRouteSpec

(Appears on: TCPRoute)

TCPRouteSpec defines the desired state of TCPRoute

Field Description
rules
[]TCPRouteRule

Rules are a list of TCP matchers and actions.

gateways
RouteGateways
(Optional)

Gateways defines which Gateways can use this Route.

TCPRouteStatus

(Appears on: TCPRoute)

TCPRouteStatus defines the observed state of TCPRoute

Field Description
RouteStatus
RouteStatus

(Members of RouteStatus are embedded into this type.)

TLSModeType (string alias)

(Appears on: GatewayTLSConfig)

TLSModeType type defines how a Gateway handles TLS sessions.

Value Description

"Passthrough"

In this mode, the TLS session is NOT terminated by the Gateway. This implies that the Gateway can’t decipher the TLS stream except for the ClientHello message of the TLS protocol.

"Terminate"

In this mode, TLS session between the downstream client and the Gateway is terminated at the Gateway.

TLSOverridePolicy

(Appears on: GatewayTLSConfig)

TLSOverridePolicy defines a schema for overriding TLS settings at the Route level.

Field Description
certificate
TLSRouteOverrideType
(Optional)

Certificate dictates if TLS certificates can be configured via Routes. If set to ‘Allow’, a TLS certificate for a hostname defined in a Route takes precedence over the certificate defined in Gateway.

Support: Core

TLSRouteMatch

(Appears on: TLSRouteRule)

TLSRouteMatch defines the predicate used to match connections to a given action.

Field Description
extensionRef
LocalObjectReference
(Optional)

ExtensionRef is an optional, implementation-specific extension to the “match” behavior. For example, resource “mytlsroutematcher” in group “networking.acme.io”. If the referent cannot be found, the rule is not included in the route. The controller should raise the “ResolvedRefs” condition on the Gateway with the “DegradedRoutes” reason. The gateway status for this route should be updated with a condition that describes the error more specifically.

Support: Custom

TLSRouteOverrideType (string alias)

(Appears on: TLSOverridePolicy)

TLSRouteOverrideType type defines the level of allowance for Routes to override a specific TLS setting.

Value Description

"Allow"

Allows the parameter to be configured from all routes.

"Deny"

Prohibits the parameter from being configured from any route.

TLSRouteRule

(Appears on: TLSRouteSpec)

TLSRouteRule is the configuration for a given rule.

Field Description
matches
[]TLSRouteMatch
(Optional)

Matches define conditions used for matching the rule against incoming TLS connections. Each match is independent, i.e. this rule will be matched if any one of the matches is satisfied. If unspecified (i.e. empty), this Rule will match all requests for the associated Listener.

Each client request MUST map to a maximum of one route rule. If a request matches multiple rules, matching precedence MUST be determined in order of the following criteria, continuing on ties:

  • The longest matching SNI.
  • The longest matching precise SNI (without a wildcard). This means that “b.example.com” should be given precedence over “*.example.com”.
  • The most specific match specified by ExtensionRef. Each implementation that supports ExtensionRef may have different ways of determining the specificity of the referenced extension.

If ties still exist across multiple Routes, matching precedence MUST be determined in order of the following criteria, continuing on ties:

  • The oldest Route based on creation timestamp. For example, a Route with a creation timestamp of “2020-09-08 01:02:03” is given precedence over a Route with a creation timestamp of “2020-09-08 01:02:04”.
  • The Route appearing first in alphabetical order by “/”. For example, foo/bar is given precedence over foo/baz.

If ties still exist within the Route that has been given precedence, matching precedence MUST be granted to the first matching rule meeting the above criteria.

forwardTo
[]RouteForwardTo

ForwardTo defines the backend(s) where matching requests should be sent.

TLSRouteSpec

(Appears on: TLSRoute)

TLSRouteSpec defines the desired state of a TLSRoute resource.

Field Description
gateways
RouteGateways
(Optional)

Gateways defines which Gateways can use this Route.

hostnames
[]Hostname
(Optional)

Hostnames defines a set of SNI names that should match against the SNI attribute of TLS ClientHello message in TLS handshake.

SNI can be “precise” which is a domain name without the terminating dot of a network host (e.g. “foo.example.com”) or “wildcard”, which is a domain name prefixed with a single wildcard label (e.g. *.example.com). The wildcard character * must appear by itself as the first DNS label and matches only a single label. You cannot have a wildcard label by itself (e.g. Host == *).

Requests will be matched against the Host field in the following order:

  1. If SNI is precise, the request matches this rule if the SNI in ClientHello is equal to one of the defined SNIs.
  2. If SNI is a wildcard, then the request matches this rule if the SNI is to equal to the suffix (removing the first label) of the wildcard rule.
  3. If SNIs is unspecified, all requests associated with the gateway TLS listener will match. This can be used to define a default backend for a TLS listener.

Support: Core

rules
[]TLSRouteRule

Rules are a list of TLS matchers and actions.

TLSRouteStatus

(Appears on: TLSRoute)

TLSRouteStatus defines the observed state of TLSRoute

Field Description
RouteStatus
RouteStatus

(Members of RouteStatus are embedded into this type.)

UDPRouteMatch

(Appears on: UDPRouteRule)

UDPRouteMatch defines the predicate used to match packets to a given action.

Field Description
extensionRef
LocalObjectReference
(Optional)

ExtensionRef is an optional, implementation-specific extension to the “match” behavior. For example, resource “myudproutematcher” in group “networking.acme.io”. If the referent cannot be found, the rule is not included in the route. The controller should raise the “ResolvedRefs” condition on the Gateway with the “DegradedRoutes” reason. The gateway status for this route should be updated with a condition that describes the error more specifically.

Support: Custom

UDPRouteRule

(Appears on: UDPRouteSpec)

UDPRouteRule is the configuration for a given rule.

Field Description
matches
[]UDPRouteMatch
(Optional)

Matches define conditions used for matching the rule against incoming UDP connections. Each match is independent, i.e. this rule will be matched if any one of the matches is satisfied. If unspecified (i.e. empty), this Rule will match all requests for the associated Listener.

Each client request MUST map to a maximum of one route rule. If a request matches multiple rules, matching precedence MUST be determined in order of the following criteria, continuing on ties:

  • The most specific match specified by ExtensionRef. Each implementation that supports ExtensionRef may have different ways of determining the specificity of the referenced extension.

If ties still exist across multiple Routes, matching precedence MUST be determined in order of the following criteria, continuing on ties:

  • The oldest Route based on creation timestamp. For example, a Route with a creation timestamp of “2020-09-08 01:02:03” is given precedence over a Route with a creation timestamp of “2020-09-08 01:02:04”.
  • The Route appearing first in alphabetical order by “/”. For example, foo/bar is given precedence over foo/baz.

If ties still exist within the Route that has been given precedence, matching precedence MUST be granted to the first matching rule meeting the above criteria.

forwardTo
[]RouteForwardTo

ForwardTo defines the backend(s) where matching requests should be sent.

UDPRouteSpec

(Appears on: UDPRoute)

UDPRouteSpec defines the desired state of UDPRoute.

Field Description
rules
[]UDPRouteRule

Rules are a list of UDP matchers and actions.

gateways
RouteGateways
(Optional)

Gateways defines which Gateways can use this Route.

UDPRouteStatus

(Appears on: UDPRoute)

UDPRouteStatus defines the observed state of UDPRoute.

Field Description
RouteStatus
RouteStatus

(Members of RouteStatus are embedded into this type.)


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