diff options
| author | Oliver Hartkopp <socketcan@hartkopp.net> | 2022-03-09 13:04:15 +0100 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2022-03-10 09:23:45 +0100 |
| commit | 1574481bb3de11c9d44f5405c17e948b76794f39 (patch) | |
| tree | f43255a99adc8a7eda222a4344d8fba06ccbae09 /drivers/net | |
| parent | can: isotp: set max PDU size to 64 kByte (diff) | |
| download | linux-1574481bb3de11c9d44f5405c17e948b76794f39.tar.xz linux-1574481bb3de11c9d44f5405c17e948b76794f39.zip | |
vxcan: remove sk reference in peer skb
With can_create_echo_skb() the skb which is forwarded to the peer CAN
interface shares the sk pointer from the originating socket.
This makes the CAN frame show up in the peer namespace as a TX packet.
With the use of skb_clone() analogue to the handling in gw.c the peer
skb gets a new start in the peer namespace and correctly appears as
a RX packet.
Link: https://lore.kernel.org/all/20220309120416.83514-4-socketcan@hartkopp.net
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/can/vxcan.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/net/can/vxcan.c b/drivers/net/can/vxcan.c index 556f1a12ec9a..51501af8d9fc 100644 --- a/drivers/net/can/vxcan.c +++ b/drivers/net/can/vxcan.c @@ -33,28 +33,33 @@ struct vxcan_priv { struct net_device __rcu *peer; }; -static netdev_tx_t vxcan_xmit(struct sk_buff *skb, struct net_device *dev) +static netdev_tx_t vxcan_xmit(struct sk_buff *oskb, struct net_device *dev) { struct vxcan_priv *priv = netdev_priv(dev); struct net_device *peer; - struct canfd_frame *cfd = (struct canfd_frame *)skb->data; + struct canfd_frame *cfd = (struct canfd_frame *)oskb->data; struct net_device_stats *peerstats, *srcstats = &dev->stats; + struct sk_buff *skb; u8 len; - if (can_dropped_invalid_skb(dev, skb)) + if (can_dropped_invalid_skb(dev, oskb)) return NETDEV_TX_OK; rcu_read_lock(); peer = rcu_dereference(priv->peer); if (unlikely(!peer)) { - kfree_skb(skb); + kfree_skb(oskb); dev->stats.tx_dropped++; goto out_unlock; } - skb = can_create_echo_skb(skb); - if (!skb) + skb = skb_clone(oskb, GFP_ATOMIC); + if (skb) { + consume_skb(oskb); + } else { + kfree(oskb); goto out_unlock; + } /* reset CAN GW hop counter */ skb->csum_start = 0; |