From: Alexander Hölzl alexander.hoelzl@gmx.net

The J1939 standard requires the transmission of messages of length 0.

For example proprietary messages are specified with a data length of 0 to 1785. The transmission of such messages is not possible. Sending results in no error being returned but no corresponding can frame being generated.

Enable the transmission of zero length J1939 messages. In order to facilitate this two changes are necessary:

1) If the transmission of a new message is requested from user space the message is segmented in j1939_sk_send_loop(). Let the segmentation take into account zero length messages, do not terminate immediately, queue the corresponding skb.

2) j1939_session_skb_get_by_offset() selects the next skb to transmit for a session. Take into account that there might be zero length skbs in the queue.

Signed-off-by: Alexander Hölzl alexander.hoelzl@gmx.net Acked-by: Oleksij Rempel o.rempel@pengutronix.de Link: https://patch.msgid.link/20250205174651.103238-1-alexander.hoelzl@gmx.net Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Cc: stable@vger.kernel.org [mkl: commit message rephrased] Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de --- net/can/j1939/socket.c | 4 ++-- net/can/j1939/transport.c | 5 +++-- 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c index 305dd72c844c..17226b2341d0 100644 --- a/net/can/j1939/socket.c +++ b/net/can/j1939/socket.c @@ -1132,7 +1132,7 @@ static int j1939_sk_send_loop(struct j1939_priv *priv, struct sock *sk,

todo_size = size;

- while (todo_size) { + do { struct j1939_sk_buff_cb *skcb;

segment_size = min_t(size_t, J1939_MAX_TP_PACKET_SIZE, @@ -1177,7 +1177,7 @@ static int j1939_sk_send_loop(struct j1939_priv *priv, struct sock *sk,

todo_size -= segment_size; session->total_queued_size += segment_size; - } + } while (todo_size);

switch (ret) { case 0: /* OK */ diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c index 95f7a7e65a73..9b72d118d756 100644 --- a/net/can/j1939/transport.c +++ b/net/can/j1939/transport.c @@ -382,8 +382,9 @@ sk_buff *j1939_session_skb_get_by_offset(struct j1939_session *session, skb_queue_walk(&session->skb_queue, do_skb) { do_skcb = j1939_skb_to_cb(do_skb);

- if (offset_start >= do_skcb->offset && - offset_start < (do_skcb->offset + do_skb->len)) { + if ((offset_start >= do_skcb->offset && + offset_start < (do_skcb->offset + do_skb->len)) || + (offset_start == 0 && do_skcb->offset == 0 && do_skb->len == 0)) { skb = do_skb; } }