Subject: [PATCH 1/4] net/tls: handle MSG_EOR for tls_sw TX flow

From: Hannes Reinecke <[email-masked]>
Date: Mon, 12 Jun 2023 16:38:30 +0200

tls_sw_sendmsg() / tls_do_sw_sendpage() already handles
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 negation of MSG_MORE.
And erroring out if MSG_EOR is specified with either
MSG_MORE or MSG_SENDPAGE_NOTLAST.

Cc: Jakub Kicinski <[email-masked]>
Cc: [email-masked]
Signed-off-by: Hannes Reinecke <[email-masked]>
---
 net/tls/tls_sw.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 635b8bf6b937..16eae0c5c819 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -953,7 +953,10 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 	int pending;
 
 	if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
-			       MSG_CMSG_COMPAT))
+			       MSG_EOR | MSG_CMSG_COMPAT))
+		return -EOPNOTSUPP;
+
+	if (!eor && msg->msg_flags & MSG_EOR)
 		return -EOPNOTSUPP;
 
 	ret = mutex_lock_interruptible(&tls_ctx->tx_lock);
@@ -1274,11 +1277,15 @@ static int tls_sw_do_sendpage(struct sock *sk, struct page *page,
 int tls_sw_sendpage_locked(struct sock *sk, struct page *page,
 			   int offset, size_t size, int flags)
 {
-	if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
+	if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_EOR |
 		      MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY |
 		      MSG_NO_SHARED_FRAGS))
 		return -EOPNOTSUPP;
 
+	if ((flags & (MSG_MORE | MSG_SENDPAGE_NOTLAST)) &&
+	    (flags & MSG_EOR))
+		return -EINVAL;
+
 	return tls_sw_do_sendpage(sk, page, offset, size, flags);
 }
 
@@ -1288,10 +1295,14 @@ int tls_sw_sendpage(struct sock *sk, struct page *page,
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
 	int ret;
 
-	if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
+	if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_EOR |
 		      MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY))
 		return -EOPNOTSUPP;
 
+	if ((flags & (MSG_MORE | MSG_SENDPAGE_NOTLAST)) &&
+	    (flags & MSG_EOR))
+		return -EOPNOTSUPP;
+
 	ret = mutex_lock_interruptible(&tls_ctx->tx_lock);
 	if (ret)
 		return ret;
-- 
2.35.3