SUNRPC: Ignore data_ready callbacks during TLS handshakes

The RPC header parser doesn't recognize TLS handshake traffic, so it
will close the connection prematurely with an error. To avoid that,
shunt the transport's data_ready callback when there is a TLS
handshake in progress.

The XPRT_SOCK_IGNORE_RECV flag will be toggled by code added in a
subsequent patch.

Signed-off-by: Chuck Lever <[e-mail]>
Reviewed-by: Jeff Layton <[e-mail]>
Signed-off-by: Trond Myklebust <[e-mail]>

include/linux/sunrpc/xprtsock.h

···
 #define XPRT_SOCK_WAKE_DISCONNECT	(7)
 #define XPRT_SOCK_CONNECT_SENT	(8)
 #define XPRT_SOCK_NOSPACE	(9)
+#define XPRT_SOCK_IGNORE_RECV	(10)
 
 #endif /* _LINUX_SUNRPC_XPRTSOCK_H */

net/sunrpc/xprtsock.c

···
 {
 
 	clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
+	if (test_bit(XPRT_SOCK_IGNORE_RECV, &transport->sock_state))
+		return;
 	if (!xs_poll_socket_readable(transport))
 		return;
 	if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
···
 		trace_xs_data_ready(xprt);
 
 		transport->old_data_ready(sk);
+
+		if (test_bit(XPRT_SOCK_IGNORE_RECV, &transport->sock_state))
+			return;
+
 		/* Any data means we had a useful conversation, so
 		 * then we don't need to delay the next reconnect
 		 */