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can: j1939: fix support for multipacket broadcast message

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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: 9d71dd0c70 ("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>
This commit is contained in:
Zhang Changzhong
2020-08-05 11:50:22 +08:00
committed by Marc Kleine-Budde
parent 4ca0d9ac3f
commit f4fd77fd87
1 changed files with 14 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
net/can/j1939/transport.c
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@@ -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) {