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can: skb: drop tx skb if in listen only mode

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Frames can be directly injected to a can driver via the packet
socket. By doing so, it is possible to reach the
net_device_ops::ndo_start_xmit function even if the driver is
configured in listen only mode.

Add a check in can_dropped_invalid_skb() to discard the skb if
CAN_CTRLMODE_LISTENONLY is set.

Link: https://lore.kernel.org/all/20220610143009.323579-8-mailhol.vincent@wanadoo.fr
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Acked-by: Max Staudt <max@enpas.org>
Tested-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Vincent Mailhol 2022-06-10 23:30:09 +09:00 committed by Marc Kleine-Budde
parent ccd8a9351f
commit a6d190f8c7
1 changed files with 8 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

9
drivers/net/can/dev/skb.c
View file

@ -5,6 +5,7 @@
*/ */
#include <linux/can/dev.h> #include <linux/can/dev.h>
#include <linux/can/netlink.h>
#include <linux/module.h> #include <linux/module.h>
#define MOD_DESC "CAN device driver interface" #define MOD_DESC "CAN device driver interface"
@ -293,6 +294,7 @@ static bool can_skb_headroom_valid(struct net_device *dev, struct sk_buff *skb)
bool can_dropped_invalid_skb(struct net_device *dev, struct sk_buff *skb) bool can_dropped_invalid_skb(struct net_device *dev, struct sk_buff *skb)
{ {
const struct canfd_frame *cfd = (struct canfd_frame *)skb->data; const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
struct can_priv *priv = netdev_priv(dev);
if (skb->protocol == htons(ETH_P_CAN)) { if (skb->protocol == htons(ETH_P_CAN)) {
if (unlikely(skb->len != CAN_MTU || if (unlikely(skb->len != CAN_MTU ||
@ -306,8 +308,13 @@ bool can_dropped_invalid_skb(struct net_device *dev, struct sk_buff *skb)
goto inval_skb; goto inval_skb;
} }
if (!can_skb_headroom_valid(dev, skb)) if (!can_skb_headroom_valid(dev, skb)) {
goto inval_skb; goto inval_skb;
} else if (priv->ctrlmode & CAN_CTRLMODE_LISTENONLY) {
netdev_info_once(dev,
"interface in listen only mode, dropping skb\n");
goto inval_skb;
}
return false; return false;