rxrpc: Provide kernel interface to set max lifespan on a call

Provide an interface to set max lifespan on a call from inside of the
kernel without having to call kernel_sendmsg().

Signed-off-by: David Howells <dhowells@redhat.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index ae8c5d7f3bf1..213935fbbbf7 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -443,6 +443,31 @@ void rxrpc_kernel_new_call_notification(
 }
 EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
 
+/**
+ * rxrpc_kernel_set_max_life - Set maximum lifespan on a call
+ * @sock: The socket the call is on
+ * @call: The call to configure
+ * @hard_timeout: The maximum lifespan of the call in jiffies
+ *
+ * Set the maximum lifespan of a call.  The call will end with ETIME or
+ * ETIMEDOUT if it takes longer than this.
+ */
+void rxrpc_kernel_set_max_life(struct socket *sock, struct rxrpc_call *call,
+                               unsigned long hard_timeout)
+{
+        unsigned long now;
+
+        mutex_lock(&call->user_mutex);
+
+        now = jiffies;
+        hard_timeout += now;
+        WRITE_ONCE(call->expect_term_by, hard_timeout);
+        rxrpc_reduce_call_timer(call, hard_timeout, now, rxrpc_timer_set_for_hard);
+
+        mutex_unlock(&call->user_mutex);
+}
+EXPORT_SYMBOL(rxrpc_kernel_set_max_life);
+
 /*
  * connect an RxRPC socket
  * - this just targets it at a specific destination; no actual connection