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Fix mesh gateways incorrectly matching peer locality. (#16257) 

Fix mesh gateways incorrectly matching peer locality.

This fixes an issue where local mesh gateways use an
incorrect address when attempting to forward traffic to a
peered datacenter. Prior to this change it would use the
lan address instead of the wan if the locality matched. This
should never be done for peering, since we must route all
traffic through the remote mesh gateway.
This commit is contained in:
Derek Menteer 2023-02-16 09:22:41 -06:00 committed by GitHub
parent 9b7fc8cdf7
commit d87e4acb4d
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 31 additions and 15 deletions
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3
.changelog/16257.txt Normal file
View File

@ -0,0 +1,3 @@
```release-note:bug
peering: Fix issue where mesh gateways would use the wrong address when contacting a remote peer with the same datacenter name.
```

8
agent/proxycfg/testing_mesh_gateway.go
View File

@ -659,8 +659,8 @@ func TestConfigSnapshotPeeredMeshGateway(t testing.T, variant string, nsFn func(
CorrelationID: "peering-connect-service:peer-a:db",
Result: &structs.IndexedCheckServiceNodes{
Nodes: structs.CheckServiceNodes{
structs.TestCheckNodeServiceWithNameInPeer(t, "db", "peer-a", "10.40.1.1", false),
structs.TestCheckNodeServiceWithNameInPeer(t, "db", "peer-a", "10.40.1.2", false),
structs.TestCheckNodeServiceWithNameInPeer(t, "db", "dc1", "peer-a", "10.40.1.1", false),
structs.TestCheckNodeServiceWithNameInPeer(t, "db", "dc1", "peer-a", "10.40.1.2", false),
},
},
},
@ -668,8 +668,8 @@ func TestConfigSnapshotPeeredMeshGateway(t testing.T, variant string, nsFn func(
CorrelationID: "peering-connect-service:peer-b:alt",
Result: &structs.IndexedCheckServiceNodes{
Nodes: structs.CheckServiceNodes{
structs.TestCheckNodeServiceWithNameInPeer(t, "alt", "peer-b", "10.40.2.1", false),
structs.TestCheckNodeServiceWithNameInPeer(t, "alt", "peer-b", "10.40.2.2", true),
structs.TestCheckNodeServiceWithNameInPeer(t, "alt", "remote-dc", "peer-b", "10.40.2.1", false),
structs.TestCheckNodeServiceWithNameInPeer(t, "alt", "remote-dc", "peer-b", "10.40.2.2", true),
},
},
},

4
agent/proxycfg/testing_upstreams.go
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@ -94,7 +94,7 @@ func setupTestVariationConfigEntriesAndSnapshot(
events = append(events, UpdateEvent{
CorrelationID: "upstream-peer:db?peer=cluster-01",
Result: &structs.IndexedCheckServiceNodes{
Nodes: structs.CheckServiceNodes{structs.TestCheckNodeServiceWithNameInPeer(t, "db", "cluster-01", "10.40.1.1", false)},
Nodes: structs.CheckServiceNodes{structs.TestCheckNodeServiceWithNameInPeer(t, "db", "dc1", "cluster-01", "10.40.1.1", false)},
},
})
case "redirect-to-cluster-peer":
@ -112,7 +112,7 @@ func setupTestVariationConfigEntriesAndSnapshot(
events = append(events, UpdateEvent{
CorrelationID: "upstream-peer:db?peer=cluster-01",
Result: &structs.IndexedCheckServiceNodes{
Nodes: structs.CheckServiceNodes{structs.TestCheckNodeServiceWithNameInPeer(t, "db", "cluster-01", "10.40.1.1", false)},
Nodes: structs.CheckServiceNodes{structs.TestCheckNodeServiceWithNameInPeer(t, "db", "dc2", "cluster-01", "10.40.1.1", false)},
},
})
case "failover-through-double-remote-gateway-triggered":

19
agent/structs/testing_catalog.go
View File

@ -55,11 +55,13 @@ func TestNodeServiceWithName(t testing.T, name string) *NodeService {
const peerTrustDomain = "1c053652-8512-4373-90cf-5a7f6263a994.consul"
func TestCheckNodeServiceWithNameInPeer(t testing.T, name, peer, ip string, useHostname bool) CheckServiceNode {
func TestCheckNodeServiceWithNameInPeer(t testing.T, name, dc, peer, ip string, useHostname bool) CheckServiceNode {
service := &NodeService{
Kind: ServiceKindTypical,
Service: name,
Port: 8080,
// We should not see this port number appear in most xds golden tests,
// because the WAN addr should typically be used.
Port: 9090,
PeerName: peer,
Connect: ServiceConnect{
PeerMeta: &PeeringServiceMeta{
@ -72,6 +74,13 @@ func TestCheckNodeServiceWithNameInPeer(t testing.T, name, peer, ip string, useH
Protocol: "tcp",
},
},
// This value should typically be seen in golden file output, since this is a peered service.
TaggedAddresses: map[string]ServiceAddress{
TaggedAddressWAN: {
Address: ip,
Port: 8080,
},
},
}
if useHostname {
@ -91,8 +100,10 @@ func TestCheckNodeServiceWithNameInPeer(t testing.T, name, peer, ip string, useH
Node: &Node{
ID: "test1",
Node: "test1",
Address: ip,
Datacenter: "cloud-dc",
// We should not see this address appear in most xds golden tests,
// because the WAN addr should typically be used.
Address: "1.23.45.67",
Datacenter: dc,
},
Service: service,
}

4
agent/xds/endpoints.go
View File

@ -449,7 +449,9 @@ func (s *ResourceGenerator) makeEndpointsForOutgoingPeeredServices(
la := makeLoadAssignment(
clusterName,
groups,
cfgSnap.Locality,
// Use an empty key here so that it never matches. This will force the mesh gateway to always
// reference the remote mesh gateway's wan addr.
proxycfg.GatewayKey{},
)
resources = append(resources, la)
}