void *__pskb_pull_tail(struct sk_buff *skb, int delta);
-static inline bool pskb_may_pull(struct sk_buff *skb, unsigned int len)
+static inline enum skb_drop_reason
+pskb_may_pull_reason(struct sk_buff *skb, unsigned int len)
{
if (likely(len <= skb_headlen(skb)))
- return true;
+ return SKB_NOT_DROPPED_YET;
+
if (unlikely(len > skb->len))
- return false;
- return __pskb_pull_tail(skb, len - skb_headlen(skb)) != NULL;
+ return SKB_DROP_REASON_PKT_TOO_SMALL;
+
+ if (unlikely(!__pskb_pull_tail(skb, len - skb_headlen(skb))))
+ return SKB_DROP_REASON_NOMEM;
+
+ return SKB_NOT_DROPPED_YET;
+}
+
+static inline bool pskb_may_pull(struct sk_buff *skb, unsigned int len)
+{
+ return pskb_may_pull_reason(skb, len) == SKB_NOT_DROPPED_YET;
}
static inline void *pskb_pull(struct sk_buff *skb, unsigned int len)