Subject: [PATCH 2/4] net/tls: handle MSG_EOR for tls_device TX flow

From: Hannes Reinecke <[email-masked]>
Date: Tue, 20 Jun 2023 12:28:54 +0200

tls_push_data() MSG_MORE / MSG_SENDPAGE_NOTLAST, but bails
out on MSG_EOR.
But seeing that MSG_EOR is basically the opposite of
MSG_MORE / MSG_SENDPAGE_NOTLAST this patch adds handling
MSG_EOR by treating it as the absence of MSG_MORE.
Consequently we should return an error when both are set.

Cc: Jakub Kicinski <[email-masked]>
Cc: [email-masked]
Signed-off-by: Hannes Reinecke <[email-masked]>
---
 net/tls/tls_device.c | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index b82770f68807..ebefd148ecf5 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -440,11 +440,6 @@ static int tls_push_data(struct sock *sk,
 	int copy, rc = 0;
 	long timeo;
 
-	if (flags &
-	    ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST |
-	      MSG_SPLICE_PAGES))
-		return -EOPNOTSUPP;
-
 	if (unlikely(sk->sk_err))
 		return -sk->sk_err;
 
@@ -536,6 +531,10 @@ static int tls_push_data(struct sock *sk,
 				more = true;
 				break;
 			}
+			if (flags & MSG_EOR) {
+				more = false;
+				break;
+			}
 
 			done = true;
 		}
@@ -582,6 +581,14 @@ int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 	if (!tls_ctx->zerocopy_sendfile)
 		msg->msg_flags &= ~MSG_SPLICE_PAGES;
 
+	if (msg->msg_flags &
+	    ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST |
+	      MSG_SPLICE_PAGES | MSG_EOR))
+		return -EOPNOTSUPP;
+
+	if ((msg->msg_flags & (MSG_MORE | MSG_EOR)) == (MSG_MORE | MSG_EOR))
+		return -EOPNOTSUPP;
+
 	mutex_lock(&tls_ctx->tx_lock);
 	lock_sock(sk);
 
@@ -627,9 +634,17 @@ int tls_device_sendpage(struct sock *sk, struct page *page,
 	struct bio_vec bvec;
 	struct msghdr msg = { .msg_flags = flags | MSG_SPLICE_PAGES, };
 
+	if (flags &
+	    ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST |
+	      MSG_SPLICE_PAGES | MSG_EOR))
+		return -EOPNOTSUPP;
+
 	if (flags & MSG_SENDPAGE_NOTLAST)
 		msg.msg_flags |= MSG_MORE;
 
+	if ((msg.msg_flags & (MSG_MORE | MSG_EOR)) == (MSG_MORE | MSG_EOR))
+		return -EINVAL;
+
 	if (flags & MSG_OOB)
 		return -EOPNOTSUPP;
 
-- 
2.35.3