allow subscription from other chains

runtime/kusama/src/lib.rs

@@ -77,11 +77,12 @@ use sp_version::RuntimeVersion;
 use static_assertions::const_assert;
 use xcm::latest::prelude::*;
 use xcm_builder::{
-	AccountId32Aliases, AllowTopLevelPaidExecutionFrom, AllowUnpaidExecutionFrom,
-	BackingToPlurality, ChildParachainAsNative, ChildParachainConvertsVia,
-	ChildSystemParachainAsSuperuser, CurrencyAdapter as XcmCurrencyAdapter, FixedWeightBounds,
-	IsChildSystemParachain, IsConcrete, LocationInverter, SignedAccountId32AsNative,
-	SignedToAccountId32, SovereignSignedViaLocation, TakeWeightCredit, UsingComponents,
+	AccountId32Aliases, AllowKnownQueryResponses, AllowSubscriptionsFrom,
+	AllowTopLevelPaidExecutionFrom, AllowUnpaidExecutionFrom, BackingToPlurality,
+	ChildParachainAsNative, ChildParachainConvertsVia, ChildSystemParachainAsSuperuser,
+	CurrencyAdapter as XcmCurrencyAdapter, FixedWeightBounds, IsChildSystemParachain, IsConcrete,
+	LocationInverter, SignedAccountId32AsNative, SignedToAccountId32, SovereignSignedViaLocation,
+	TakeWeightCredit, UsingComponents,
 };
 use xcm_executor::XcmExecutor;
 
@@ -1333,6 +1334,10 @@ pub type TrustedTeleporters = (xcm_builder::Case<KusamaForStatemine>,);
 pub type Barrier = (
 	// Weight that is paid for may be consumed.
 	TakeWeightCredit,
+	// Registered QueryResponse will be handled
+	AllowKnownQueryResponses<XcmPallet>,
+	// Handle SubscribeVersion/UnsubscribeVersion message from all other chains
+	AllowSubscriptionsFrom<Everything>,
 	// If the message is one that immediately attemps to pay for execution, then allow it.
 	AllowTopLevelPaidExecutionFrom<Everything>,
 	// Messages coming from system parachains need not pay for execution.

runtime/rococo/src/lib.rs

@@ -667,9 +667,14 @@ parameter_types! {
 		];
 }
 
-use xcm_builder::{AllowTopLevelPaidExecutionFrom, AllowUnpaidExecutionFrom, TakeWeightCredit};
+use xcm_builder::{
+	AllowKnownQueryResponses, AllowSubscriptionsFrom, AllowTopLevelPaidExecutionFrom,
+	AllowUnpaidExecutionFrom, TakeWeightCredit,
+};
 pub type Barrier = (
 	TakeWeightCredit,
+	AllowKnownQueryResponses<XcmPallet>,
+	AllowSubscriptionsFrom<Everything>,
 	AllowTopLevelPaidExecutionFrom<Everything>,
 	AllowUnpaidExecutionFrom<IsInVec<AllowUnpaidFrom>>, // <- Trusted parachains get free execution
 );

runtime/westend/src/lib.rs

@@ -46,8 +46,9 @@ use runtime_parachains::{
 
 use xcm::latest::prelude::*;
 use xcm_builder::{
-	AccountId32Aliases, AllowTopLevelPaidExecutionFrom, AllowUnpaidExecutionFrom,
-	ChildParachainAsNative, ChildParachainConvertsVia, ChildSystemParachainAsSuperuser,
+	AccountId32Aliases, AllowKnownQueryResponses, AllowSubscriptionsFrom,
+	AllowTopLevelPaidExecutionFrom, AllowUnpaidExecutionFrom, ChildParachainAsNative,
+	ChildParachainConvertsVia, ChildSystemParachainAsSuperuser,
 	CurrencyAdapter as XcmCurrencyAdapter, IsChildSystemParachain, IsConcrete, LocationInverter,
 	SignedAccountId32AsNative, SignedToAccountId32, SovereignSignedViaLocation, TakeWeightCredit,
 	UsingComponents, WeightInfoBounds,
@@ -972,6 +973,10 @@ pub type TrustedTeleporters = (xcm_builder::Case<WestendForWestmint>,);
 pub type Barrier = (
 	// Weight that is paid for may be consumed.
 	TakeWeightCredit,
+	// Registered QueryResponse will be handled
+	AllowKnownQueryResponses<XcmPallet>,
+	// Handle SubscribeVersion/UnsubscribeVersion message from all other chains
+	AllowSubscriptionsFrom<Everything>,
 	// If the message is one that immediately attemps to pay for execution, then allow it.
 	AllowTopLevelPaidExecutionFrom<Everything>,
 	// Messages coming from system parachains need not pay for execution.