net/tls: handle MSG_EOR for tls_sw TX flow

tls_sw_sendmsg() already handles MSG_MORE, but bails
out on MSG_EOR.
Seeing that MSG_EOR is basically the opposite of
MSG_MORE this patch adds handling MSG_EOR by treating
it as the negation of MSG_MORE.
And erroring out if MSG_EOR is specified with MSG_MORE.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20230726191556.41714-2-hare@suse.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 53f944e6d8ef24edb0c91721de4b272ec5fccfcd..9aef45e870a56b0610b9ce0b2581a98ac684870e 100644 (file)
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -984,6 +984,9 @@ static int tls_sw_sendmsg_locked(struct sock *sk, struct msghdr *msg,
        int ret = 0;
        int pending;
 
+       if (!eor && (msg->msg_flags & MSG_EOR))
+               return -EINVAL;
+
        if (unlikely(msg->msg_controllen)) {
                ret = tls_process_cmsg(sk, msg, &record_type);
                if (ret) {
@@ -1193,7 +1196,7 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
        int ret;
 
        if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
-                              MSG_CMSG_COMPAT | MSG_SPLICE_PAGES |
+                              MSG_CMSG_COMPAT | MSG_SPLICE_PAGES | MSG_EOR |
                               MSG_SENDPAGE_NOPOLICY))
                return -EOPNOTSUPP;