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Subject: [PATCH v2 09/15] SUNRPC: Ignore data_ready callbacks during TLS
 handshakes
From:   Chuck Lever <chuck.lever@oracle.com>
To:     linux-nfs@vger.kernel.org
Cc:     trondmy@hammerspace.com
Date:   Mon, 06 Jun 2022 10:51:26 -0400
Message-ID: <165452708680.1496.7964119806588286372.stgit@oracle-102.nfsv4.dev>
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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 flag will be toggled by code added in a subsequent patch.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 include/linux/sunrpc/xprtsock.h |    1 +
 net/sunrpc/xprtsock.c           |    6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/include/linux/sunrpc/xprtsock.h b/include/linux/sunrpc/xprtsock.h
index 38284f25eddf..daef030f4848 100644
--- a/include/linux/sunrpc/xprtsock.h
+++ b/include/linux/sunrpc/xprtsock.h
@@ -90,5 +90,6 @@ struct sock_xprt {
 #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 */
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 73fab802996d..0a521aee0b2f 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -703,6 +703,8 @@ static void xs_poll_check_readable(struct sock_xprt *transport)
 {
 
 	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))
@@ -1394,6 +1396,10 @@ static void xs_data_ready(struct sock *sk)
 		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
 		 */