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netfilter: add struct nf_nat_hook and use it

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Move decode_session() and parse_nat_setup_hook() indirections to struct
nf_nat_hook structure.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso
2018-05-23 09:17:19 +02:00
parent 1f4b24397d
commit 2c205dd398
6 changed files with 36 additions and 38 deletions
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21
include/linux/netfilter.h
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@@ -320,18 +320,29 @@ int nf_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
int nf_reroute(struct sk_buff *skb, struct nf_queue_entry *entry);
#include <net/flow.h>
extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *);
struct nf_conn;
enum nf_nat_manip_type;
struct nlattr;
struct nf_nat_hook {
int (*parse_nat_setup)(struct nf_conn *ct, enum nf_nat_manip_type manip,
const struct nlattr *attr);
void (*decode_session)(struct sk_buff *skb, struct flowi *fl);
};
extern struct nf_nat_hook __rcu *nf_nat_hook;
static inline void
nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
{
#ifdef CONFIG_NF_NAT_NEEDED
void (*decodefn)(struct sk_buff *, struct flowi *);
struct nf_nat_hook *nat_hook;
rcu_read_lock();
decodefn = rcu_dereference(nf_nat_decode_session_hook);
if (decodefn)
decodefn(skb, fl);
nat_hook = rcu_dereference(nf_nat_hook);
if (nat_hook->decode_session)
nat_hook->decode_session(skb, fl);
rcu_read_unlock();
#endif
}