[PATCH 3/6] netfilter: add nf_hook_list_active()

Pablo Neira Ayuso
2015-04-29T18:48:55Z

In preparation to have netfilter ingress per-device hook list.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
include/linux/netfilter.h | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index 388ed19..49d0063 100644
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -134,26 +134,33 @@ extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
#ifdef HAVE_JUMP_LABEL
extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];

-static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
+static inline bool nf_hook_list_active(struct list_head *nf_hook_list,
+ u_int8_t pf, unsigned int hook)
{
if (__builtin_constant_p(pf) &&
__builtin_constant_p(hook))
return static_key_false(&nf_hooks_needed[pf][hook]);

- return !list_empty(&nf_hooks[pf][hook]);
+ return !list_empty(nf_hook_list);
}
#else
-static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
+static inline bool nf_hook_list_active(struct list_head *nf_hook_list,
+ u_int8_t pf, unsigned int hook)
{
- return !list_empty(&nf_hooks[pf][hook]);
+ return !list_empty(nf_hook_list);
}
#endif

+static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
+{
+ return nf_hook_list_active(&nf_hooks[pf][hook], pf, hook);
+}
+
int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state);

/**
* nf_hook_thresh - call a netfilter hook
- *
+ *
* Returns 1 if the hook has allowed the packet to pass. The function
* okfn must be invoked by the caller in this case. Any other return
* value indicates the packet has been consumed by the hook.
--
1.7.10.4