can: j1939: fix support for multipacket broadcast message

Currently j1939_tp_im_involved_anydir() in j1939_tp_recv() check the previously
set flags J1939_ECU_LOCAL_DST and J1939_ECU_LOCAL_SRC of incoming skb, thus
multipacket broadcast message was aborted by receive side because it may come
from remote ECUs and have no exact dst address. Similarly, j1939_tp_cmd_recv()
and j1939_xtp_rx_dat() didn't process broadcast message.

So fix it by checking and process broadcast message in j1939_tp_recv(),
j1939_tp_cmd_recv() and j1939_xtp_rx_dat().

Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Link: https://lore.kernel.org/r/1596599425-5534-2-git-send-email-zhangchangzhong@huawei.com
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c
index 5cf107c..868ecb2 100644 (file)
--- a/net/can/j1939/transport.c
+++ b/net/can/j1939/transport.c
@@ -1673,8 +1673,12 @@ static void j1939_xtp_rx_rts(struct j1939_priv *priv, struct sk_buff *skb,
                        return;
                }
                session = j1939_xtp_rx_rts_session_new(priv, skb);
-               if (!session)
+               if (!session) {
+                       if (cmd == J1939_TP_CMD_BAM && j1939_sk_recv_match(priv, skcb))
+                               netdev_info(priv->ndev, "%s: failed to create TP BAM session\n",
+                                           __func__);
                        return;
+               }
        } else {
                if (j1939_xtp_rx_rts_session_active(session, skb)) {
                        j1939_session_put(session);
@@ -1865,6 +1869,13 @@ static void j1939_xtp_rx_dat(struct j1939_priv *priv, struct sk_buff *skb)
                else
                        j1939_xtp_rx_dat_one(session, skb);
        }
+
+       if (j1939_cb_is_broadcast(skcb)) {
+               session = j1939_session_get_by_addr(priv, &skcb->addr, false,
+                                                   false);
+               if (session)
+                       j1939_xtp_rx_dat_one(session, skb);
+       }
 }
 
 /* j1939 main intf */
@@ -1956,7 +1967,7 @@ static void j1939_tp_cmd_recv(struct j1939_priv *priv, struct sk_buff *skb)
                if (j1939_tp_im_transmitter(skcb))
                        j1939_xtp_rx_rts(priv, skb, true);
 
-               if (j1939_tp_im_receiver(skcb))
+               if (j1939_tp_im_receiver(skcb) || j1939_cb_is_broadcast(skcb))
                        j1939_xtp_rx_rts(priv, skb, false);
 
                break;
@@ -2020,7 +2031,7 @@ int j1939_tp_recv(struct j1939_priv *priv, struct sk_buff *skb)
 {
        struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
 
-       if (!j1939_tp_im_involved_anydir(skcb))
+       if (!j1939_tp_im_involved_anydir(skcb) && !j1939_cb_is_broadcast(skcb))
                return 0;
 
        switch (skcb->addr.pgn) {