diff options
| author |   Oliver Hartkopp <socketcan@hartkopp.net> | 2022-09-12 19:07:19 +0200 |
|---|---|---|
| committer |   Marc Kleine-Budde <mkl@pengutronix.de> | 2022-09-15 09:08:08 +0200 |
| commit | 96a7457a14d9cf98cf58de1e26c03180e0f28141 (patch) | |
| tree | 76f566fef2733a820118b89fe7a7dbd504644903 /include/linux/can | |
| parent | can: flexcan: Switch to use dev_err_probe() helper (diff) | |
| download | linux-dev-96a7457a14d9cf98cf58de1e26c03180e0f28141.tar.xz linux-dev-96a7457a14d9cf98cf58de1e26c03180e0f28141.zip | |
can: skb: unify skb CAN frame identification helpers
Replace open coded checks for sk_buffs containing Classical CAN and
CAN FD frame structures as a preparation for CAN XL support.
With the added length check the unintended processing of CAN XL frames
having the CANXL_XLF bit set can be suppressed even when the skb->len
fits to non CAN XL frames.
The CAN_RAW socket needs a rework to use these helpers. Therefore the
use of these helpers is postponed to the CAN_RAW CAN XL integration.
The J1939 protocol gets a check for Classical CAN frames too.
Acked-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Link: https://lore.kernel.org/all/20220912170725.120748-2-socketcan@hartkopp.net
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'include/linux/can')
| -rw-r--r-- | include/linux/can/skb.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/include/linux/can/skb.h b/include/linux/can/skb.h index 182749e858b3..27ebfc28510f 100644 --- a/include/linux/can/skb.h +++ b/include/linux/can/skb.h @@ -97,10 +97,20 @@ static inline struct sk_buff *can_create_echo_skb(struct sk_buff *skb) return nskb; } +static inline bool can_is_can_skb(const struct sk_buff *skb) +{ + struct can_frame *cf = (struct can_frame *)skb->data; + + /* the CAN specific type of skb is identified by its data length */ + return (skb->len == CAN_MTU && cf->len <= CAN_MAX_DLEN); +} + static inline bool can_is_canfd_skb(const struct sk_buff *skb) { + struct canfd_frame *cfd = (struct canfd_frame *)skb->data; + /* the CAN specific type of skb is identified by its data length */ - return skb->len == CANFD_MTU; + return (skb->len == CANFD_MTU && cfd->len <= CANFD_MAX_DLEN); } #endif /* !_CAN_SKB_H */ |