On 2021/10/22 18:28, Oleksij Rempel wrote:

On Thu, Oct 21, 2021 at 10:04:17PM +0800, Zhang Changzhong wrote:

quoted

The TP.CM_BAM message must be sent to the global address [1], so add a
check to drop TP.CM_BAM sent to a non-global address.

Without this patch, the receiver will treat the following packets as
normal RTS/CTS tranport:
18EC0102#20090002FF002301
18EB0102#0100000000000000
18EB0102#020000FFFFFFFFFF

[1] SAE-J1939-82 2015 A.3.3 Row 1.

Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
Signed-off-by: Zhang Changzhong <redacted>
---
 net/can/j1939/transport.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c
index 2efa606..93ec0c3 100644
--- a/net/can/j1939/transport.c
+++ b/net/can/j1939/transport.c

@@ -2019,6 +2019,8 @@ static void j1939_tp_cmd_recv(struct j1939_priv *priv, struct sk_buff *skb)
 		extd = J1939_ETP;
 		fallthrough;
 	case J1939_TP_CMD_BAM:
+		if (!j1939_cb_is_broadcast(skcb))

Please add here netdev_err_once("with some message"), we need to know if
some MCU makes bad things.

Ok, will do.

The current patch breaks ETP functionality as the J1939_ETP_CMD_RTS fallthrough
to J1939_TP_CMD_BAM, this will also be fixed in v2.

quoted

+			return;
 		fallthrough;
 	case J1939_TP_CMD_RTS:
 		if (skcb->addr.type != extd)
-- 
2.9.5