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| author | Oliver Hartkopp <oliver@hartkopp.net> | 2010-01-12 02:00:46 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-01-12 02:00:46 -0800 |
| commit | 3ccd4c6167d3b39d52631767ebbf8b5677c5855d (patch) | |
| tree | bfcb801edebd00e8b30e897038bad7fee39625cc /include | |
| parent | d218d11133d888f9745802146a50255a4781d37a (diff) | |
| download | linux-3ccd4c6167d3b39d52631767ebbf8b5677c5855d.tar.gz linux-3ccd4c6167d3b39d52631767ebbf8b5677c5855d.tar.bz2 linux-3ccd4c6167d3b39d52631767ebbf8b5677c5855d.zip | |
can: Unify droping of invalid tx skbs and netdev stats
To prevent the CAN drivers to operate on invalid socketbuffers the skbs are
now checked and silently dropped at the xmit-function consistently.
Also the netdev stats are consistently using the CAN data length code (dlc)
for [rx|tx]_bytes now.
Signed-off-by: Oliver Hartkopp <oliver@hartkopp.net>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/can/dev.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h index 3db7767d2a17..7e7c98a3e908 100644 --- a/include/linux/can/dev.h +++ b/include/linux/can/dev.h @@ -60,6 +60,21 @@ struct can_priv { */ #define get_can_dlc(i) (min_t(__u8, (i), 8)) +/* Drop a given socketbuffer if it does not contain a valid CAN frame. */ +static inline int can_dropped_invalid_skb(struct net_device *dev, + struct sk_buff *skb) +{ + const struct can_frame *cf = (struct can_frame *)skb->data; + + if (unlikely(skb->len != sizeof(*cf) || cf->can_dlc > 8)) { + kfree_skb(skb); + dev->stats.tx_dropped++; + return 1; + } + + return 0; +} + struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max); void free_candev(struct net_device *dev); |