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net: Add skb_queue_next(). 

A lot of code wants to iterate over an SKB queue at the top level using
it's own control structure and iterator scheme.

Provide skb_queue_next(), which is only valid to invoke if
skb_queue_is_last() returns false.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-09-23 00:44:42 -07:00
parent d258b4914b
commit 249c8b42c7
1 changed files with 18 additions and 0 deletions
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18
include/linux/skbuff.h
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@ -485,6 +485,24 @@ static inline bool skb_queue_is_last(const struct sk_buff_head *list,
return (skb->next == (struct sk_buff *) list);
}
/**
* skb_queue_next - return the next packet in the queue
* @list: queue head
* @skb: current buffer
*
* Return the next packet in @list after @skb. It is only valid to
* call this if skb_queue_is_last() evaluates to false.
*/
static inline struct sk_buff *skb_queue_next(const struct sk_buff_head *list,
const struct sk_buff *skb)
{
/* This BUG_ON may seem severe, but if we just return then we
* are going to dereference garbage.
*/
BUG_ON(skb_queue_is_last(list, skb));
return skb->next;
}
/**
* skb_get - reference buffer
* @skb: buffer to reference