From 9791bad1365efd6a704229f4e73c87ebcb56fd9b Mon Sep 17 00:00:00 2001
From: "Chris S. Kim" <ckim@hashicorp.com>
Date: Fri, 29 Apr 2022 18:12:51 -0400
Subject: [PATCH] peering: Make Upstream peer-aware (#12900)

Adds DestinationPeer field to Upstream.
Adds Peer field to UpstreamID and its string conversion functions.
---
 agent/config/builder.go                 |   1 +
 agent/config/config.go                  |   1 +
 agent/connect/sni.go                    |   1 +
 agent/proxycfg/ingress_gateway.go       |   1 +
 agent/proxycfg/naming.go                |  32 ++-
 agent/proxycfg/naming_oss.go            |   6 +-
 agent/proxycfg/naming_test.go           |  22 +-
 agent/proxycfg/state.go                 |   8 +
 agent/structs/connect_proxy_config.go   |  21 +-
 agent/structs/service_definition.go     |   2 +-
 agent/structs/structs.go                |  29 ++-
 agent/structs/structs_filtering_test.go |   5 +
 agent/structs/structs_test.go           |  44 ++++
 api/agent.go                            |   1 +
 proto/pbservice/service.gen.go          |   2 +
 proto/pbservice/service.pb.go           | 285 ++++++++++++------------
 proto/pbservice/service.proto           |   3 +-
 17 files changed, 304 insertions(+), 160 deletions(-)

diff --git a/agent/config/builder.go b/agent/config/builder.go
index c2a8dd8780..7ef6c4906d 100644
--- a/agent/config/builder.go
+++ b/agent/config/builder.go
@@ -1697,6 +1697,7 @@ func (b *builder) upstreamsVal(v []Upstream) structs.Upstreams {
 			DestinationType:      stringVal(u.DestinationType),
 			DestinationNamespace: stringVal(u.DestinationNamespace),
 			DestinationPartition: stringVal(u.DestinationPartition),
+			DestinationPeer:      stringVal(u.DestinationPeer),
 			DestinationName:      stringVal(u.DestinationName),
 			Datacenter:           stringVal(u.Datacenter),
 			LocalBindAddress:     stringVal(u.LocalBindAddress),
diff --git a/agent/config/config.go b/agent/config/config.go
index c5936afa78..095be9353f 100644
--- a/agent/config/config.go
+++ b/agent/config/config.go
@@ -505,6 +505,7 @@ type Upstream struct {
 	DestinationType      *string `mapstructure:"destination_type"`
 	DestinationNamespace *string `mapstructure:"destination_namespace"`
 	DestinationPartition *string `mapstructure:"destination_partition"`
+	DestinationPeer      *string `mapstructure:"destination_peer"`
 	DestinationName      *string `mapstructure:"destination_name"`
 
 	// Datacenter that the service discovery request should be run against. Note
diff --git a/agent/connect/sni.go b/agent/connect/sni.go
index 2df3e0d11f..e693985b59 100644
--- a/agent/connect/sni.go
+++ b/agent/connect/sni.go
@@ -21,6 +21,7 @@ func UpstreamSNI(u *structs.Upstream, subset string, dc string, trustDomain stri
 	if u.DestinationType == structs.UpstreamDestTypePreparedQuery {
 		return QuerySNI(u.DestinationName, dc, trustDomain)
 	}
+	// TODO(peering): account for peer here?
 	return ServiceSNI(u.DestinationName, subset, u.DestinationNamespace, u.DestinationPartition, dc, trustDomain)
 }
 
diff --git a/agent/proxycfg/ingress_gateway.go b/agent/proxycfg/ingress_gateway.go
index 34566201bb..311b5ca85b 100644
--- a/agent/proxycfg/ingress_gateway.go
+++ b/agent/proxycfg/ingress_gateway.go
@@ -121,6 +121,7 @@ func (s *handlerIngressGateway) handleUpdate(ctx context.Context, u cache.Update
 
 			uid := NewUpstreamID(&u)
 
+			// TODO(peering): pipe destination_peer here
 			watchOpts := discoveryChainWatchOpts{
 				id:         uid,
 				name:       u.DestinationName,
diff --git a/agent/proxycfg/naming.go b/agent/proxycfg/naming.go
index e222c8fe3c..7b80d49a9d 100644
--- a/agent/proxycfg/naming.go
+++ b/agent/proxycfg/naming.go
@@ -11,6 +11,9 @@ type UpstreamID struct {
 	Type       string
 	Name       string
 	Datacenter string
+	// If Peer is not empty, Namespace refers to the remote
+	// peer namespace and Partition refers to the local partition
+	Peer string
 	acl.EnterpriseMeta
 }
 
@@ -23,11 +26,13 @@ func NewUpstreamID(u *structs.Upstream) UpstreamID {
 			u.DestinationPartition,
 			u.DestinationNamespace,
 		),
+		Peer: u.DestinationPeer,
 	}
 	id.normalize()
 	return id
 }
 
+// TODO(peering): confirm we don't need peername here
 func NewUpstreamIDFromServiceName(sn structs.ServiceName) UpstreamID {
 	id := UpstreamID{
 		Name:           sn.Name,
@@ -37,6 +42,7 @@ func NewUpstreamIDFromServiceName(sn structs.ServiceName) UpstreamID {
 	return id
 }
 
+// TODO(peering): confirm we don't need peername here
 func NewUpstreamIDFromServiceID(sid structs.ServiceID) UpstreamID {
 	id := UpstreamID{
 		Name:           sid.ID,
@@ -46,6 +52,7 @@ func NewUpstreamIDFromServiceID(sid structs.ServiceID) UpstreamID {
 	return id
 }
 
+// TODO(peering): confirm we don't need peername here
 func NewUpstreamIDFromTargetID(tid string) UpstreamID {
 	// Drop the leading subset if one is present in the target ID.
 	separators := strings.Count(tid, ".")
@@ -76,7 +83,7 @@ func (u *UpstreamID) normalize() {
 // String encodes the UpstreamID into a string for use in agent cache keys.
 // You can decode it back again using UpstreamIDFromString.
 func (u UpstreamID) String() string {
-	return UpstreamIDString(u.Type, u.Datacenter, u.Name, &u.EnterpriseMeta)
+	return UpstreamIDString(u.Type, u.Datacenter, u.Name, &u.EnterpriseMeta, u.Peer)
 }
 
 func (u UpstreamID) GoString() string {
@@ -84,12 +91,13 @@ func (u UpstreamID) GoString() string {
 }
 
 func UpstreamIDFromString(input string) UpstreamID {
-	typ, dc, name, entMeta := ParseUpstreamIDString(input)
+	typ, dc, name, entMeta, peerName := ParseUpstreamIDString(input)
 	id := UpstreamID{
 		Type:           typ,
 		Datacenter:     dc,
 		Name:           name,
 		EnterpriseMeta: *entMeta,
+		Peer:           peerName,
 	}
 	id.normalize()
 	return id
@@ -97,21 +105,25 @@ func UpstreamIDFromString(input string) UpstreamID {
 
 const upstreamTypePreparedQueryPrefix = structs.UpstreamDestTypePreparedQuery + ":"
 
-func ParseUpstreamIDString(input string) (typ, dc, name string, meta *acl.EnterpriseMeta) {
+func ParseUpstreamIDString(input string) (typ, dc, name string, meta *acl.EnterpriseMeta, peerName string) {
 	if strings.HasPrefix(input, upstreamTypePreparedQueryPrefix) {
 		typ = structs.UpstreamDestTypePreparedQuery
 		input = strings.TrimPrefix(input, upstreamTypePreparedQueryPrefix)
 	}
 
-	idx := strings.LastIndex(input, "?dc=")
-	if idx != -1 {
-		dc = input[idx+4:]
-		input = input[0:idx]
+	before, after, found := strings.Cut(input, "?")
+	input = before
+	if found {
+		if _, peerVal, ok := strings.Cut(after, "peer="); ok {
+			peerName = peerVal
+		} else if _, dcVal, ok2 := strings.Cut(after, "dc="); ok2 {
+			dc = dcVal
+		}
 	}
 
 	name, meta = parseInnerUpstreamIDString(input)
 
-	return typ, dc, name, meta
+	return typ, dc, name, meta, peerName
 }
 
 // EnvoyID returns a string representation that uniquely identifies the
@@ -126,7 +138,9 @@ func (u UpstreamID) EnvoyID() string {
 	name := u.enterpriseIdentifierPrefix() + u.Name
 	typ := u.Type
 
-	if u.Datacenter != "" {
+	if u.Peer != "" {
+		name += "?peer=" + u.Peer
+	} else if u.Datacenter != "" {
 		name += "?dc=" + u.Datacenter
 	}
 
diff --git a/agent/proxycfg/naming_oss.go b/agent/proxycfg/naming_oss.go
index 2ba2d99964..c6a3db10de 100644
--- a/agent/proxycfg/naming_oss.go
+++ b/agent/proxycfg/naming_oss.go
@@ -8,10 +8,12 @@ import (
 	"github.com/hashicorp/consul/agent/structs"
 )
 
-func UpstreamIDString(typ, dc, name string, _ *acl.EnterpriseMeta) string {
+func UpstreamIDString(typ, dc, name string, _ *acl.EnterpriseMeta, peerName string) string {
 	ret := name
 
-	if dc != "" {
+	if peerName != "" {
+		ret += "?peer=" + peerName
+	} else if dc != "" {
 		ret += "?dc=" + dc
 	}
 
diff --git a/agent/proxycfg/naming_test.go b/agent/proxycfg/naming_test.go
index a8ad9a6e71..23ff241658 100644
--- a/agent/proxycfg/naming_test.go
+++ b/agent/proxycfg/naming_test.go
@@ -8,7 +8,6 @@ import (
 	"github.com/hashicorp/consul/agent/structs"
 )
 
-// TODO(freddy): Needs enterprise test
 func TestUpstreamIDFromTargetID(t *testing.T) {
 	type testcase struct {
 		tid    string
@@ -91,6 +90,13 @@ func TestUpstreamIDFromString(t *testing.T) {
 				Datacenter: "dc2",
 			},
 		},
+		"normal with peer": {
+			"foo?peer=payments",
+			UpstreamID{
+				Name: "foo",
+				Peer: "payments",
+			},
+		},
 	}
 
 	for name, tc := range cases {
@@ -159,6 +165,13 @@ func TestUpstreamID_String(t *testing.T) {
 			},
 			prefix + "foo?dc=dc2",
 		},
+		"normal with peer": {
+			UpstreamID{
+				Name: "foo",
+				Peer: "payments",
+			},
+			prefix + "foo?peer=payments",
+		},
 	}
 
 	for name, tc := range cases {
@@ -222,6 +235,13 @@ func TestUpstreamID_EnvoyID(t *testing.T) {
 			},
 			"foo?dc=dc2",
 		},
+		"normal with peer": {
+			UpstreamID{
+				Name: "foo",
+				Peer: "billing",
+			},
+			"foo?peer=billing",
+		},
 	}
 
 	for name, tc := range cases {
diff --git a/agent/proxycfg/state.go b/agent/proxycfg/state.go
index 9d4488e1eb..eed26d2f90 100644
--- a/agent/proxycfg/state.go
+++ b/agent/proxycfg/state.go
@@ -124,6 +124,14 @@ func copyProxyConfig(ns *structs.NodeService) (structs.ConnectProxyConfig, error
 			if us.DestinationNamespace == "" {
 				proxyCfg.Upstreams[idx].DestinationNamespace = ns.EnterpriseMeta.NamespaceOrDefault()
 			}
+
+			// If PeerName is not empty, the DestinationPartition refers
+			// to the local Partition in which the Peer exists and the
+			// DestinationNamespace refers to the Namespace residing in
+			// the remote peer
+			if us.DestinationPeer == "" {
+				proxyCfg.Upstreams[idx].DestinationPeer = ns.PeerName
+			}
 		}
 	}
 
diff --git a/agent/structs/connect_proxy_config.go b/agent/structs/connect_proxy_config.go
index f59543bdf0..05e9ad9539 100644
--- a/agent/structs/connect_proxy_config.go
+++ b/agent/structs/connect_proxy_config.go
@@ -338,6 +338,7 @@ type Upstream struct {
 	DestinationType      string `alias:"destination_type"`
 	DestinationNamespace string `json:",omitempty" alias:"destination_namespace"`
 	DestinationPartition string `json:",omitempty" alias:"destination_partition"`
+	DestinationPeer      string `json:",omitempty" alias:"destination_peer"`
 	DestinationName      string `alias:"destination_name"`
 
 	// Datacenter that the service discovery request should be run against. Note
@@ -384,6 +385,7 @@ func (t *Upstream) UnmarshalJSON(data []byte) (err error) {
 		DestinationTypeSnake      string `json:"destination_type"`
 		DestinationPartitionSnake string `json:"destination_partition"`
 		DestinationNamespaceSnake string `json:"destination_namespace"`
+		DestinationPeerSnake      string `json:"destination_peer"`
 		DestinationNameSnake      string `json:"destination_name"`
 
 		LocalBindAddressSnake string `json:"local_bind_address"`
@@ -410,6 +412,9 @@ func (t *Upstream) UnmarshalJSON(data []byte) (err error) {
 	if t.DestinationPartition == "" {
 		t.DestinationPartition = aux.DestinationPartitionSnake
 	}
+	if t.DestinationPeer == "" {
+		t.DestinationPeer = aux.DestinationPeerSnake
+	}
 	if t.DestinationName == "" {
 		t.DestinationName = aux.DestinationNameSnake
 	}
@@ -447,6 +452,9 @@ func (u *Upstream) Validate() error {
 	if u.DestinationName == WildcardSpecifier && !u.CentrallyConfigured {
 		return fmt.Errorf("upstream destination name cannot be a wildcard")
 	}
+	if u.DestinationPeer != "" && u.Datacenter != "" {
+		return fmt.Errorf("upstream cannot specify both destination peer and datacenter")
+	}
 
 	if u.LocalBindPort == 0 && u.LocalBindSocketPath == "" && !u.CentrallyConfigured {
 		return fmt.Errorf("upstream local bind port or local socket path must be defined and nonzero")
@@ -467,6 +475,7 @@ func (u *Upstream) ToAPI() api.Upstream {
 		DestinationType:      api.UpstreamDestType(u.DestinationType),
 		DestinationNamespace: u.DestinationNamespace,
 		DestinationPartition: u.DestinationPartition,
+		DestinationPeer:      u.DestinationPeer,
 		DestinationName:      u.DestinationName,
 		Datacenter:           u.Datacenter,
 		LocalBindAddress:     u.LocalBindAddress,
@@ -482,13 +491,14 @@ func (u *Upstream) ToAPI() api.Upstream {
 // upstream in a canonical way. Set and unset values are deliberately handled
 // differently.
 //
-// These fields should be user-specificed explicit values and not inferred
+// These fields should be user-specified explicit values and not inferred
 // values.
 func (u *Upstream) ToKey() UpstreamKey {
 	return UpstreamKey{
 		DestinationType:      u.DestinationType,
 		DestinationPartition: u.DestinationPartition,
 		DestinationNamespace: u.DestinationNamespace,
+		DestinationPeer:      u.DestinationPeer,
 		DestinationName:      u.DestinationName,
 		Datacenter:           u.Datacenter,
 	}
@@ -528,16 +538,18 @@ type UpstreamKey struct {
 	DestinationName      string
 	DestinationPartition string
 	DestinationNamespace string
+	DestinationPeer      string
 	Datacenter           string
 }
 
 func (k UpstreamKey) String() string {
 	return fmt.Sprintf(
-		"[type=%q, name=%q, partition=%q, namespace=%q, datacenter=%q]",
+		"[type=%q, name=%q, partition=%q, namespace=%q, peer=%q, datacenter=%q]",
 		k.DestinationType,
 		k.DestinationName,
 		k.DestinationPartition,
 		k.DestinationNamespace,
+		k.DestinationPeer,
 		k.Datacenter,
 	)
 }
@@ -548,7 +560,9 @@ func (us *Upstream) String() string {
 	name := us.enterpriseStringPrefix() + us.DestinationName
 	typ := us.DestinationType
 
-	if us.Datacenter != "" {
+	if us.DestinationPeer != "" {
+		name += "?peer=" + us.DestinationPeer
+	} else if us.Datacenter != "" {
 		name += "?dc=" + us.Datacenter
 	}
 
@@ -565,6 +579,7 @@ func UpstreamFromAPI(u api.Upstream) Upstream {
 		DestinationType:      string(u.DestinationType),
 		DestinationPartition: u.DestinationPartition,
 		DestinationNamespace: u.DestinationNamespace,
+		DestinationPeer:      u.DestinationPeer,
 		DestinationName:      u.DestinationName,
 		Datacenter:           u.Datacenter,
 		LocalBindAddress:     u.LocalBindAddress,
diff --git a/agent/structs/service_definition.go b/agent/structs/service_definition.go
index 05357c8f29..d506c15f98 100644
--- a/agent/structs/service_definition.go
+++ b/agent/structs/service_definition.go
@@ -90,7 +90,7 @@ func (s *ServiceDefinition) NodeService() *NodeService {
 				ns.Proxy.Upstreams[i].DestinationType = UpstreamDestTypeService
 			}
 
-			// If a proxy's namespace is not defined, inherit the proxied service's namespace.
+			// If a proxy's namespace and partition are not defined, inherit from the proxied service
 			// Applicable only to Consul Enterprise.
 			if ns.Proxy.Upstreams[i].DestinationNamespace == "" {
 				ns.Proxy.Upstreams[i].DestinationNamespace = ns.EnterpriseMeta.NamespaceOrEmpty()
diff --git a/agent/structs/structs.go b/agent/structs/structs.go
index d5462bd51e..2991bd1640 100644
--- a/agent/structs/structs.go
+++ b/agent/structs/structs.go
@@ -1349,17 +1349,34 @@ func (s *NodeService) Validate() error {
 			bindAddrs    = make(map[string]struct{})
 		)
 		for _, u := range s.Proxy.Upstreams {
+
 			destinationPartition := u.DestinationPartition
 			if destinationPartition == "" {
-				destinationPartition = acl.DefaultPartitionName
+
+				// If we have a set DestinationPeer, then DestinationPartition
+				// must match the NodeService's Partition
+				if u.DestinationPeer != "" {
+					destinationPartition = s.PartitionOrDefault()
+				} else {
+					destinationPartition = acl.DefaultPartitionName
+				}
 			}
 
-			// cross DC Upstreams are only allowed for non "default" partitions
-			if u.Datacenter != "" && (destinationPartition != acl.DefaultPartitionName || s.PartitionOrDefault() != "default") {
-				result = multierror.Append(result, fmt.Errorf(
-					"upstreams cannot target another datacenter in non default partition"))
-				continue
+			if u.DestinationPeer == "" {
+				// cross DC Upstreams are only allowed for non "default" partitions
+				if u.Datacenter != "" && (destinationPartition != acl.DefaultPartitionName || s.PartitionOrDefault() != "default") {
+					result = multierror.Append(result, fmt.Errorf(
+						"upstreams cannot target another datacenter in non default partition"))
+					continue
+				}
+			} else {
+				if destinationPartition != s.PartitionOrDefault() {
+					result = multierror.Append(result, fmt.Errorf(
+						"upstreams must target peers in the same partition as the service"))
+					continue
+				}
 			}
+
 			if err := u.Validate(); err != nil {
 				result = multierror.Append(result, err)
 				continue
diff --git a/agent/structs/structs_filtering_test.go b/agent/structs/structs_filtering_test.go
index 93d51c5b18..6b111ea2cc 100644
--- a/agent/structs/structs_filtering_test.go
+++ b/agent/structs/structs_filtering_test.go
@@ -166,6 +166,11 @@ var expectedFieldConfigUpstreams bexpr.FieldConfigurations = bexpr.FieldConfigur
 		CoerceFn:            bexpr.CoerceString,
 		SupportedOperations: []bexpr.MatchOperator{bexpr.MatchEqual, bexpr.MatchNotEqual, bexpr.MatchIn, bexpr.MatchNotIn, bexpr.MatchMatches, bexpr.MatchNotMatches},
 	},
+	"DestinationPeer": &bexpr.FieldConfiguration{
+		StructFieldName:     "DestinationPeer",
+		CoerceFn:            bexpr.CoerceString,
+		SupportedOperations: []bexpr.MatchOperator{bexpr.MatchEqual, bexpr.MatchNotEqual, bexpr.MatchIn, bexpr.MatchNotIn, bexpr.MatchMatches, bexpr.MatchNotMatches},
+	},
 	"DestinationName": &bexpr.FieldConfiguration{
 		StructFieldName:     "DestinationName",
 		CoerceFn:            bexpr.CoerceString,
diff --git a/agent/structs/structs_test.go b/agent/structs/structs_test.go
index cee4cff2e0..94aa103be9 100644
--- a/agent/structs/structs_test.go
+++ b/agent/structs/structs_test.go
@@ -1120,6 +1120,20 @@ func TestStructs_NodeService_ValidateConnectProxy(t *testing.T) {
 			},
 			"upstreams cannot contain duplicates",
 		},
+		{
+			"connect-proxy: valid Upstream.PeerDestination",
+			func(x *NodeService) {
+				x.Proxy.Upstreams = Upstreams{
+					{
+						DestinationType: UpstreamDestTypeService,
+						DestinationName: "foo",
+						DestinationPeer: "peer1",
+						LocalBindPort:   5000,
+					},
+				}
+			},
+			"",
+		},
 	}
 
 	for _, tc := range cases {
@@ -1178,6 +1192,36 @@ func TestStructs_NodeService_ValidateConnectProxy_In_Partition(t *testing.T) {
 			},
 			"",
 		},
+		{
+			"connect-proxy: Upstream with peer targets partition different from NodeService",
+			func(x *NodeService) {
+				x.Proxy.Upstreams = Upstreams{
+					{
+						DestinationType:      UpstreamDestTypeService,
+						DestinationName:      "foo",
+						DestinationPartition: "part1",
+						DestinationPeer:      "peer1",
+						LocalBindPort:        5000,
+					},
+				}
+			},
+			"upstreams must target peers in the same partition as the service",
+		},
+		{
+			"connect-proxy: Upstream with peer defaults to NodeService's peer",
+			func(x *NodeService) {
+				x.Proxy.Upstreams = Upstreams{
+					{
+						DestinationType: UpstreamDestTypeService,
+						DestinationName: "foo",
+						// No DestinationPartition here but we assert that it defaults to "bar" and not "default"
+						DestinationPeer: "peer1",
+						LocalBindPort:   5000,
+					},
+				}
+			},
+			"",
+		},
 	}
 
 	for _, tc := range cases {
diff --git a/api/agent.go b/api/agent.go
index f69c697c50..7247675563 100644
--- a/api/agent.go
+++ b/api/agent.go
@@ -427,6 +427,7 @@ type Upstream struct {
 	DestinationType      UpstreamDestType `json:",omitempty"`
 	DestinationPartition string           `json:",omitempty"`
 	DestinationNamespace string           `json:",omitempty"`
+	DestinationPeer      string           `json:",omitempty"`
 	DestinationName      string
 	Datacenter           string                 `json:",omitempty"`
 	LocalBindAddress     string                 `json:",omitempty"`
diff --git a/proto/pbservice/service.gen.go b/proto/pbservice/service.gen.go
index 9644f7c876..0f4d0603ba 100644
--- a/proto/pbservice/service.gen.go
+++ b/proto/pbservice/service.gen.go
@@ -185,6 +185,7 @@ func UpstreamToStructs(s *Upstream, t *structs.Upstream) {
 	t.DestinationType = s.DestinationType
 	t.DestinationNamespace = s.DestinationNamespace
 	t.DestinationPartition = s.DestinationPartition
+	t.DestinationPeer = s.DestinationPeer
 	t.DestinationName = s.DestinationName
 	t.Datacenter = s.Datacenter
 	t.LocalBindAddress = s.LocalBindAddress
@@ -204,6 +205,7 @@ func UpstreamFromStructs(t *structs.Upstream, s *Upstream) {
 	s.DestinationType = t.DestinationType
 	s.DestinationNamespace = t.DestinationNamespace
 	s.DestinationPartition = t.DestinationPartition
+	s.DestinationPeer = t.DestinationPeer
 	s.DestinationName = t.DestinationName
 	s.Datacenter = t.Datacenter
 	s.LocalBindAddress = t.LocalBindAddress
diff --git a/proto/pbservice/service.pb.go b/proto/pbservice/service.pb.go
index 5749c39283..d8275bd78c 100644
--- a/proto/pbservice/service.pb.go
+++ b/proto/pbservice/service.pb.go
@@ -220,6 +220,8 @@ type Upstream struct {
 	// on service definitions in various places.
 	DestinationType      string `protobuf:"bytes,1,opt,name=DestinationType,proto3" json:"DestinationType,omitempty"`
 	DestinationNamespace string `protobuf:"bytes,2,opt,name=DestinationNamespace,proto3" json:"DestinationNamespace,omitempty"`
+	DestinationPartition string `protobuf:"bytes,12,opt,name=DestinationPartition,proto3" json:"DestinationPartition,omitempty"`
+	DestinationPeer      string `protobuf:"bytes,13,opt,name=DestinationPeer,proto3" json:"DestinationPeer,omitempty"`
 	DestinationName      string `protobuf:"bytes,3,opt,name=DestinationName,proto3" json:"DestinationName,omitempty"`
 	// Datacenter that the service discovery request should be run against. Note
 	// for prepared queries, the actual results might be from a different
@@ -243,9 +245,8 @@ type Upstream struct {
 	// instance registration or whether it was generated from a config entry.
 	CentrallyConfigured bool `protobuf:"varint,9,opt,name=CentrallyConfigured,proto3" json:"CentrallyConfigured,omitempty"`
 	// LocalBindSocketPath is the socket to create to connect to the upstream service
-	LocalBindSocketPath  string `protobuf:"bytes,10,opt,name=LocalBindSocketPath,proto3" json:"LocalBindSocketPath,omitempty"`
-	LocalBindSocketMode  string `protobuf:"bytes,11,opt,name=LocalBindSocketMode,proto3" json:"LocalBindSocketMode,omitempty"`
-	DestinationPartition string `protobuf:"bytes,12,opt,name=DestinationPartition,proto3" json:"DestinationPartition,omitempty"`
+	LocalBindSocketPath string `protobuf:"bytes,10,opt,name=LocalBindSocketPath,proto3" json:"LocalBindSocketPath,omitempty"`
+	LocalBindSocketMode string `protobuf:"bytes,11,opt,name=LocalBindSocketMode,proto3" json:"LocalBindSocketMode,omitempty"`
 }
 
 func (x *Upstream) Reset() {
@@ -294,6 +295,20 @@ func (x *Upstream) GetDestinationNamespace() string {
 	return ""
 }
 
+func (x *Upstream) GetDestinationPartition() string {
+	if x != nil {
+		return x.DestinationPartition
+	}
+	return ""
+}
+
+func (x *Upstream) GetDestinationPeer() string {
+	if x != nil {
+		return x.DestinationPeer
+	}
+	return ""
+}
+
 func (x *Upstream) GetDestinationName() string {
 	if x != nil {
 		return x.DestinationName
@@ -357,13 +372,6 @@ func (x *Upstream) GetLocalBindSocketMode() string {
 	return ""
 }
 
-func (x *Upstream) GetDestinationPartition() string {
-	if x != nil {
-		return x.DestinationPartition
-	}
-	return ""
-}
-
 // ServiceConnect are the shared Connect settings between all service
 // definitions from the agent to the state store.
 // mog annotation:
@@ -1076,141 +1084,144 @@ var file_proto_pbservice_service_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/proto/pbservice/service.proto b/proto/pbservice/service.proto
index 64860625b1..0dd589767f 100644
--- a/proto/pbservice/service.proto
+++ b/proto/pbservice/service.proto
@@ -95,6 +95,8 @@ message Upstream {
     // on service definitions in various places.
     string DestinationType = 1;
     string DestinationNamespace = 2;
+    string DestinationPartition = 12;
+    string DestinationPeer = 13;
     string DestinationName = 3;
 
     // Datacenter that the service discovery request should be run against. Note
@@ -127,7 +129,6 @@ message Upstream {
     // LocalBindSocketPath is the socket to create to connect to the upstream service
     string LocalBindSocketPath = 10;
     string LocalBindSocketMode = 11;
-    string DestinationPartition = 12;
 }
 
 // ServiceConnect are the shared Connect settings between all service