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authorArnd Bergmann <arnd@arndb.de>2015-10-09 20:45:42 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2015-10-16 18:45:36 +0200
commit008027c31d57a22bd80dda5acc95b037634eee0f (patch)
treef28ab648fda1217f6a9ad14d13ced16bbcd7dc42
parent81b4325eba6baae80a70d1af866278af38fb6cdd (diff)
downloadlinux-008027c31d57a22bd80dda5acc95b037634eee0f.tar.bz2
netfilter: turn NF_HOOK into an inline function
A recent change to the dst_output handling caused a new warning when the call to NF_HOOK() is the only used of a local variable passed as 'dev', and CONFIG_NETFILTER is disabled: net/ipv6/ip6_output.c: In function 'ip6_output': net/ipv6/ip6_output.c:135:21: warning: unused variable 'dev' [-Wunused-variable] The reason for this is that the NF_HOOK macro in this case does not reference the variable at all, and the call to dev_net(dev) got removed from the ip6_output function. To avoid that warning now and in the future, this changes the macro into an equivalent inline function, which tells the compiler that the variable is passed correctly but still unused. The dn_forward function apparently had the same problem in the past and added a local workaround that no longer works with the inline function. In order to avoid a regression, we have to also remove the #ifdef from decnet in the same patch. Fixes: ede2059dbaf9 ("dst: Pass net into dst->output") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
-rw-r--r--include/linux/netfilter.h19
-rw-r--r--net/decnet/dn_route.c2
2 files changed, 17 insertions, 4 deletions
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index ef11e1d77699..0ad556726181 100644
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -346,8 +346,23 @@ nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
}
#else /* !CONFIG_NETFILTER */
-#define NF_HOOK(pf, hook, net, sk, skb, indev, outdev, okfn) (okfn)(net, sk, skb)
-#define NF_HOOK_COND(pf, hook, net, sk, skb, indev, outdev, okfn, cond) (okfn)(net, sk, skb)
+static inline int
+NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
+ struct sk_buff *skb, struct net_device *in, struct net_device *out,
+ int (*okfn)(struct net *, struct sock *, struct sk_buff *),
+ bool cond)
+{
+ return okfn(net, sk, skb);
+}
+
+static inline int
+NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
+ struct sk_buff *skb, struct net_device *in, struct net_device *out,
+ int (*okfn)(struct net *, struct sock *, struct sk_buff *))
+{
+ return okfn(net, sk, skb);
+}
+
static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
struct sock *sk, struct sk_buff *skb,
struct net_device *indev, struct net_device *outdev,
diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index e930321e2c1d..0c491fc0e254 100644
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -789,9 +789,7 @@ static int dn_forward(struct sk_buff *skb)
struct dn_dev *dn_db = rcu_dereference(dst->dev->dn_ptr);
struct dn_route *rt;
int header_len;
-#ifdef CONFIG_NETFILTER
struct net_device *dev = skb->dev;
-#endif
if (skb->pkt_type != PACKET_HOST)
goto drop;