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netfilter: decouple nf_hook_entry and nf_hook_ops

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During nfhook traversal we only need a very small subset of
nf_hook_ops members.

We need:
- next element
- hook function to call
- hook function priv argument

Bridge netfilter also needs 'thresh'; can be obtained via ->orig_ops.

nf_hook_entry struct is now 32 bytes on x86_64.

A followup patch will turn the run-time list into an array that only
stores hook functions plus their priv arguments, eliminating the ->next
element.

Suggested-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Aaron Conole <aconole@bytheb.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Aaron Conole 2016-11-15 17:48:45 -05:00 committed by Pablo Neira Ayuso
parent 0aa8c57a04
commit d415b9eb76
1 changed files with 6 additions and 4 deletions
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10
include/linux/netfilter.h
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@ -75,7 +75,8 @@ struct nf_hook_ops {
struct nf_hook_entry {
struct nf_hook_entry __rcu *next;
struct nf_hook_ops ops;
nf_hookfn *hook;
void *priv;
const struct nf_hook_ops *orig_ops;
};
@ -83,21 +84,22 @@ static inline void
nf_hook_entry_init(struct nf_hook_entry *entry, const struct nf_hook_ops *ops)
{
entry->next = NULL;
entry->ops = *ops;
entry->hook = ops->hook;
entry->priv = ops->priv;
entry->orig_ops = ops;
}
static inline int
nf_hook_entry_priority(const struct nf_hook_entry *entry)
{
return entry->ops.priority;
return entry->orig_ops->priority;
}
static inline int
nf_hook_entry_hookfn(const struct nf_hook_entry *entry, struct sk_buff *skb,
struct nf_hook_state *state)
{
return entry->ops.hook(entry->ops.priv, skb, state);
return entry->hook(entry->priv, skb, state);
}
static inline const struct nf_hook_ops *