diff --git a/Documentation/networking/rxrpc.txt b/Documentation/networking/rxrpc.txt
index 67879992b4c2..605e00cdd6be 100644
--- a/Documentation/networking/rxrpc.txt
+++ b/Documentation/networking/rxrpc.txt
@@ -1080,6 +1080,20 @@ The kernel interface functions are as follows:
      successful, the timestamp will be stored into *_ts and true will be
      returned; false will be returned otherwise.
 
+ (*) Get remote client epoch.
+
+	u32 rxrpc_kernel_get_epoch(struct socket *sock,
+				   struct rxrpc_call *call)
+
+     This allows the epoch that's contained in packets of an incoming client
+     call to be queried.  This value is returned.  The function always
+     successful if the call is still in progress.  It shouldn't be called once
+     the call has expired.  Note that calling this on a local client call only
+     returns the local epoch.
+
+     This value can be used to determine if the remote client has been
+     restarted as it shouldn't change otherwise.
+
 
 =======================
 CONFIGURABLE PARAMETERS
diff --git a/include/net/af_rxrpc.h b/include/net/af_rxrpc.h
index c4c912554dee..de587948042a 100644
--- a/include/net/af_rxrpc.h
+++ b/include/net/af_rxrpc.h
@@ -78,6 +78,7 @@ int rxrpc_kernel_retry_call(struct socket *, struct rxrpc_call *,
 int rxrpc_kernel_check_call(struct socket *, struct rxrpc_call *,
 			    enum rxrpc_call_completion *, u32 *);
 u32 rxrpc_kernel_check_life(struct socket *, struct rxrpc_call *);
+u32 rxrpc_kernel_get_epoch(struct socket *, struct rxrpc_call *);
 bool rxrpc_kernel_get_reply_time(struct socket *, struct rxrpc_call *,
 				 ktime_t *);
 
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 2fdd276f6842..013dbcb052e5 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -385,6 +385,20 @@ u32 rxrpc_kernel_check_life(struct socket *sock, struct rxrpc_call *call)
 }
 EXPORT_SYMBOL(rxrpc_kernel_check_life);
 
+/**
+ * rxrpc_kernel_get_epoch - Retrieve the epoch value from a call.
+ * @sock: The socket the call is on
+ * @call: The call to query
+ *
+ * Allow a kernel service to retrieve the epoch value from a service call to
+ * see if the client at the other end rebooted.
+ */
+u32 rxrpc_kernel_get_epoch(struct socket *sock, struct rxrpc_call *call)
+{
+	return call->conn->proto.epoch;
+}
+EXPORT_SYMBOL(rxrpc_kernel_get_epoch);
+
 /**
  * rxrpc_kernel_check_call - Check a call's state
  * @sock: The socket the call is on