To prevent the CAN drivers to operate on invalid socketbuffers the skbs are

[socketcan-devel.git] / kernel / 2.6 / include / socketcan / can / dev.h

diff --git a/kernel/2.6/include/socketcan/can/dev.h b/kernel/2.6/include/socketcan/can/dev.h
index eaf1a9dddbcd0de79c07127ced3d3cbac45921b8..4e6da7f6cf2627a1dc12f32fb9a3b84879e25233 100644 (file)
--- a/kernel/2.6/include/socketcan/can/dev.h
+++ b/kernel/2.6/include/socketcan/can/dev.h
@@ -80,6 +80,21 @@ struct can_priv {
 struct net_device_stats *can_get_stats(struct net_device *dev);
 #endif
 
+/* 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);