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netfilter: nf_nat: add nat hook register functions to nf_nat

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This adds the infrastructure to register nat hooks with the nat core
instead of the netfilter core.

nat hooks are used to configure nat bindings.  Such hooks are registered
from ip(6)table_nat or by the nftables core when a nat chain is added.

After next patch, nat hooks will be registered with nf_nat instead of
netfilter core.  This allows to use many nat lookup functions at the
same time while doing the real packet rewrite (nat transformation) in
one place.

This change doesn't convert the intended users yet to ease review.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal
2018-05-23 09:14:05 +02:00
committed by Pablo Neira Ayuso
parent 06cad3acf0
commit 1cd472bf03
2 changed files with 161 additions and 0 deletions
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include/net/netfilter/nf_nat.h
+4
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@@ -75,4 +75,8 @@ static inline bool nf_nat_oif_changed(unsigned int hooknum,
#endif
}
int nf_nat_register_fn(struct net *net, const struct nf_hook_ops *ops,
const struct nf_hook_ops *nat_ops, unsigned int ops_count);
void nf_nat_unregister_fn(struct net *net, const struct nf_hook_ops *ops,
unsigned int ops_count);
#endif