Merge branch 'in-kernel-support-for-the-tls-alert-protocol'

Chuck Lever says:

====================
In-kernel support for the TLS Alert protocol

IMO the kernel doesn't need user space (ie, tlshd) to handle the TLS
Alert protocol. Instead, a set of small helper functions can be used
to handle sending and receiving TLS Alerts for in-kernel TLS
consumers.
====================

Merged on top of a tag in case it's needed in the NFS tree.

Link: https://lore.kernel.org/r/169047923706.5241.1181144206068116926.stgit@oracle-102.nfsv4bat.org
Signed-off-by: Jakub Kicinski <[email protected]>

1 files changed, 25 insertions, 18 deletions

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 9f010369100a..268a2cc61acd 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -47,7 +47,7 @@
 #include <net/checksum.h>
 #include <net/udp.h>
 #include <net/tcp.h>
-#include <net/tls.h>
+#include <net/tls_prot.h>
 #include <net/handshake.h>
 
 #include <linux/bvec.h>
@@ -360,24 +360,27 @@ static int
 xs_sock_process_cmsg(struct socket *sock, struct msghdr *msg,
 		     struct cmsghdr *cmsg, int ret)
 {
-	if (cmsg->cmsg_level == SOL_TLS &&
-	    cmsg->cmsg_type == TLS_GET_RECORD_TYPE) {
-		u8 content_type = *((u8 *)CMSG_DATA(cmsg));
+	u8 content_type = tls_get_record_type(sock->sk, cmsg);
+	u8 level, description;
 
-		switch (content_type) {
-		case TLS_RECORD_TYPE_DATA:
-			/* TLS sets EOR at the end of each application data
-			 * record, even though there might be more frames
-			 * waiting to be decrypted.
-			 */
-			msg->msg_flags &= ~MSG_EOR;
-			break;
-		case TLS_RECORD_TYPE_ALERT:
-			ret = -ENOTCONN;
-			break;
-		default:
-			ret = -EAGAIN;
-		}
+	switch (content_type) {
+	case 0:
+		break;
+	case TLS_RECORD_TYPE_DATA:
+		/* TLS sets EOR at the end of each application data
+		 * record, even though there might be more frames
+		 * waiting to be decrypted.
+		 */
+		msg->msg_flags &= ~MSG_EOR;
+		break;
+	case TLS_RECORD_TYPE_ALERT:
+		tls_alert_recv(sock->sk, msg, &level, &description);
+		ret = (level == TLS_ALERT_LEVEL_FATAL) ?
+			-EACCES : -EAGAIN;
+		break;
+	default:
+		/* discard this record type */
+		ret = -EAGAIN;
 	}
 	return ret;
 }
@@ -777,6 +780,8 @@ static void xs_stream_data_receive(struct sock_xprt *transport)
 	}
 	if (ret == -ESHUTDOWN)
 		kernel_sock_shutdown(transport->sock, SHUT_RDWR);
+	else if (ret == -EACCES)
+		xprt_wake_pending_tasks(&transport->xprt, -EACCES);
 	else
 		xs_poll_check_readable(transport);
 out:
@@ -1292,6 +1297,8 @@ static void xs_close(struct rpc_xprt *xprt)
 
 	dprintk("RPC:       xs_close xprt %p\n", xprt);
 
+	if (transport->sock)
+		tls_handshake_close(transport->sock);
 	xs_reset_transport(transport);
 	xprt->reestablish_timeout = 0;
 }