From: Chuck Lever <chuck.lever@oracle.com>
Date: Thu, 27 Jul 2023 13:37:10 -0400
Subject: net/handshake: Add helpers for parsing incoming TLS Alerts
Patch-mainline: v6.6-rc1
Git-commit: 39d0e38dcced8d4da92cd11f3ff618bacc42d8a9
References: bsc#1193203 jsc#PED-6252 jsc#PED-5728 jsc#PED-5062 jsc#PED-3535

Kernel TLS consumers can replace common TLS Alert parsing code with
these helpers.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Link: https://lore.kernel.org/r/169047942074.5241.13791647439480672048.stgit@oracle-102.nfsv4bat.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
 include/net/handshake.h |    4 ++++
 net/handshake/alert.c   |   42 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

--- a/include/net/handshake.h
+++ b/include/net/handshake.h
@@ -42,4 +42,8 @@ int tls_server_hello_psk(const struct tl
 bool tls_handshake_cancel(struct sock *sk);
 void tls_handshake_close(struct socket *sock);
 
+u8 tls_get_record_type(const struct sock *sk, const struct cmsghdr *msg);
+void tls_alert_recv(const struct sock *sk, const struct msghdr *msg,
+		    u8 *level, u8 *description);
+
 #endif /* _NET_HANDSHAKE_H */
--- a/net/handshake/alert.c
+++ b/net/handshake/alert.c
@@ -59,3 +59,45 @@ int tls_alert_send(struct socket *sock,
 	ret = sock_sendmsg(sock, &msg);
 	return ret < 0 ? ret : 0;
 }
+
+/**
+ * tls_get_record_type - Look for TLS RECORD_TYPE information
+ * @sk: socket (for IP address information)
+ * @cmsg: incoming message to be parsed
+ *
+ * Returns zero or a TLS_RECORD_TYPE value.
+ */
+u8 tls_get_record_type(const struct sock *sk, const struct cmsghdr *cmsg)
+{
+	u8 record_type;
+
+	if (cmsg->cmsg_level != SOL_TLS)
+		return 0;
+	if (cmsg->cmsg_type != TLS_GET_RECORD_TYPE)
+		return 0;
+
+	record_type = *((u8 *)CMSG_DATA(cmsg));
+	return record_type;
+}
+EXPORT_SYMBOL(tls_get_record_type);
+
+/**
+ * tls_alert_recv - Parse TLS Alert messages
+ * @sk: socket (for IP address information)
+ * @msg: incoming message to be parsed
+ * @level: OUT - TLS AlertLevel value
+ * @description: OUT - TLS AlertDescription value
+ *
+ */
+void tls_alert_recv(const struct sock *sk, const struct msghdr *msg,
+		    u8 *level, u8 *description)
+{
+	const struct kvec *iov;
+	u8 *data;
+
+	iov = msg->msg_iter.kvec;
+	data = iov->iov_base;
+	*level = data[0];
+	*description = data[1];
+}
+EXPORT_SYMBOL(tls_alert_recv);