From: Marc Kleine-Budde <mkl@pengutronix.de>
To: netdev@vger.kernel.org
Cc: davem@davemloft.net, linux-can@vger.kernel.org,
kernel@pengutronix.de,
Zhang Changzhong <zhangchangzhong@huawei.com>,
Oleksij Rempel <o.rempel@pengutronix.de>,
Marc Kleine-Budde <mkl@pengutronix.de>
Subject: [PATCH 1/4] can: j1939: fix support for multipacket broadcast message
Date: Sat, 15 Aug 2020 11:21:13 +0200 [thread overview]
Message-ID: <20200815092116.424137-2-mkl@pengutronix.de> (raw)
In-Reply-To: <20200815092116.424137-1-mkl@pengutronix.de>
From: Zhang Changzhong <zhangchangzhong@huawei.com>
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>
---
net/can/j1939/transport.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c
index 5cf107cb447c..868ecb2bfa45 100644
--- 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) {
--
2.28.0
next prev parent reply other threads:[~2020-08-15 22:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-15 9:21 pull-request: can 2020-08-15 Marc Kleine-Budde
2020-08-15 9:21 ` Marc Kleine-Budde [this message]
2020-08-15 9:21 ` [PATCH 2/4] can: j1939: cancel rxtimer on multipacket broadcast session complete Marc Kleine-Budde
2020-08-15 9:21 ` [PATCH 3/4] can: j1939: abort multipacket broadcast session when timeout occurs Marc Kleine-Budde
2020-08-15 9:21 ` [PATCH 4/4] can: j1939: add rxtimer for multipacket broadcast session Marc Kleine-Budde
2020-08-16 23:05 ` pull-request: can 2020-08-15 David Miller
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