Thread (14 messages) read the whole thread 14 messages, 4 authors, 2015-11-13
STALE3915d

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[PATCH 01/10] netfilter: ingress: don't use nf_hook_list_active

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: 2015-11-11 17:33:53
Also in: netfilter-devel
Subsystem: netfilter, the rest · Maintainers: Pablo Neira Ayuso, Florian Westphal, Linus Torvalds 

From: Florian Westphal <fw@strlen.de>

nf_hook_list_active() always returns true once at least one device has
NF_INGRESS hook enabled.

Thus, don't use this function. Instead, inverse the test and use the static
key to elide list_empty test if no NF_INGRESS hooks are active.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 include/linux/netfilter_ingress.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/linux/netfilter_ingress.h b/include/linux/netfilter_ingress.h
index 187feab..ba7ce88 100644
--- a/include/linux/netfilter_ingress.h
+++ b/include/linux/netfilter_ingress.h
@@ -5,10 +5,13 @@
 #include <linux/netdevice.h>
 
 #ifdef CONFIG_NETFILTER_INGRESS
-static inline int nf_hook_ingress_active(struct sk_buff *skb)
+static inline bool nf_hook_ingress_active(const struct sk_buff *skb)
 {
-	return nf_hook_list_active(&skb->dev->nf_hooks_ingress,
-				   NFPROTO_NETDEV, NF_NETDEV_INGRESS);
+#ifdef HAVE_JUMP_LABEL
+	if (!static_key_false(&nf_hooks_needed[NFPROTO_NETDEV][NF_NETDEV_INGRESS]))
+		return false;
+#endif
+	return !list_empty(&skb->dev->nf_hooks_ingress);
 }
 
 static inline int nf_hook_ingress(struct sk_buff *skb)
-- 
2.1.4
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