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net, ipv4, ipv6: Correct assignment of skb->network_header to skb->tail

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This corrects an regression introduced by "net: Use 16bits for *_headers
fields of struct skbuff" when NET_SKBUFF_DATA_USES_OFFSET is not set. In
that case skb->tail will be a pointer however skb->network_header is now
an offset.

This patch corrects the problem by adding a wrapper to return skb tail as
an offset regardless of the value of NET_SKBUFF_DATA_USES_OFFSET. It seems
that skb->tail that this offset may be more than 64k and some care has been
taken to treat such cases as an error.

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Simon Horman 2013-05-28 20:34:29 +00:00 • committed by David S. Miller
commit 7cc4619005
4 changed files with 38 additions and 4 deletions
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9
include/linux/skbuff.h
View file

@ -1391,6 +1391,11 @@ static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset)
skb_reset_tail_pointer(skb);
skb->tail += offset;
}
static inline unsigned long skb_tail_offset(const struct sk_buff *skb)
{
return skb->tail;
}
#else /* NET_SKBUFF_DATA_USES_OFFSET */
static inline unsigned char *skb_tail_pointer(const struct sk_buff *skb)
{
@ -1407,6 +1412,10 @@ static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset)
skb->tail = skb->data + offset;
}
static inline unsigned long skb_tail_offset(const struct sk_buff *skb)
{
return skb->tail - skb->head;
}
#endif /* NET_SKBUFF_DATA_USES_OFFSET */
/*