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[NETFILTER] bridge: code rearrangement for clarity

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Cleanup and rearrangement for better style and clarity:
	Split the function nf_bridge_maybe_copy_header into two pieces
	Move copy portion out of line.
	Use Ethernet header size macros.
	Use header file to handle CONFIG_NETFILTER_BRIDGE differences

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2006-08-29 17:48:17 -07:00 • committed by David S. Miller
commit 07317621d0
3 changed files with 33 additions and 25 deletions
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26
include/linux/netfilter_bridge.h
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@ -47,26 +47,12 @@ enum nf_br_hook_priorities {
/* Only used in br_forward.c */
static inline
int nf_bridge_maybe_copy_header(struct sk_buff *skb)
extern int nf_bridge_copy_header(struct sk_buff *skb);
static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)
{
int err;
if (skb->nf_bridge) {
if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
err = skb_cow(skb, 18);
if (err)
return err;
memcpy(skb->data - 18, skb->nf_bridge->data, 18);
skb_push(skb, 4);
} else {
err = skb_cow(skb, 16);
if (err)
return err;
memcpy(skb->data - 16, skb->nf_bridge->data, 16);
}
}
return 0;
if (skb->nf_bridge)
return nf_bridge_copy_header(skb);
return 0;
}
/* This is called by the IP fragmenting code and it ensures there is
@ -90,6 +76,8 @@ struct bridge_skb_cb {
};
extern int brnf_deferred_hooks;
#else
#define nf_bridge_maybe_copy_header(skb) (0)
#endif /* CONFIG_BRIDGE_NETFILTER */
#endif /* __KERNEL__ */