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[NET] skbuff: Add skb_cow_head

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This patch adds an optimised version of skb_cow that avoids the copy if
the header can be modified even if the rest of the payload is cloned.

This can be used in encapsulating paths where we only need to modify the
header.  As it is, this can be used in PPPOE and bridging.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2007-09-16 16:21:16 -07:00 • committed by David S. Miller
parent e081e1e3ef
commit d9cc20484e
3 changed files with 33 additions and 11 deletions
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2
net/bridge/br_netfilter.c
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@ -183,7 +183,7 @@ int nf_bridge_copy_header(struct sk_buff *skb)
int err;
int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb);
err = skb_cow(skb, header_size);
err = skb_cow_head(skb, header_size);
if (err)
return err;