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net: add pskb_may_pull_reason() helper

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[ Upstream commit 1fb2d41501 ]

pskb_may_pull() can fail for two different reasons.

Provide pskb_may_pull_reason() helper to distinguish
between these reasons.

It returns:

SKB_NOT_DROPPED_YET           : Success
SKB_DROP_REASON_PKT_TOO_SMALL : packet too small
SKB_DROP_REASON_NOMEM         : skb->head could not be resized

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 8bd67ebb50c0 ("net: bridge: xmit: make sure we have at least eth header len bytes")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet
2023-02-10 18:47:06 +00:00
committed by Greg Kroah-Hartman
parent 43504dae4d
commit ce83060743
1 changed files with 15 additions and 4 deletions
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19
include/linux/skbuff.h
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@@ -2636,15 +2636,26 @@ void *skb_pull_data(struct sk_buff *skb, size_t len);
void *__pskb_pull_tail(struct sk_buff *skb, int delta); 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)
{ {
DEBUG_NET_WARN_ON_ONCE(len > INT_MAX); DEBUG_NET_WARN_ON_ONCE(len > INT_MAX);
if (likely(len <= skb_headlen(skb))) if (likely(len <= skb_headlen(skb)))
return true; return SKB_NOT_DROPPED_YET;
if (unlikely(len > skb->len)) if (unlikely(len > skb->len))
return false; return SKB_DROP_REASON_PKT_TOO_SMALL;
return __pskb_pull_tail(skb, len - skb_headlen(skb)) != NULL;
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) static inline void *pskb_pull(struct sk_buff *skb, unsigned int len)