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netfilter: Introduce NFPROTO_* constants

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The netfilter subsystem only supports a handful of protocols (much
less than PF_*) and even non-PF protocols like ARP and
pseudo-protocols like PF_BRIDGE. By creating NFPROTO_*, we can earn a
few memory savings on arrays that previously were always PF_MAX-sized
and keep the pseudo-protocols to ourselves.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Jan Engelhardt
2008-10-08 11:35:00 +02:00
committed by Patrick McHardy
parent 079aa88fe7
commit 7e9c6eeb13
5 changed files with 37 additions and 25 deletions
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14
include/linux/netfilter.h
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@@ -52,6 +52,16 @@ enum nf_inet_hooks {
NF_INET_NUMHOOKS
};
enum {
NFPROTO_UNSPEC = 0,
NFPROTO_IPV4 = 2,
NFPROTO_ARP = 3,
NFPROTO_BRIDGE = 7,
NFPROTO_IPV6 = 10,
NFPROTO_DECNET = 12,
NFPROTO_NUMPROTO,
};
union nf_inet_addr {
__u32 all[4];
__be32 ip;
@@ -138,7 +148,7 @@ extern struct ctl_path nf_net_netfilter_sysctl_path[];
extern struct ctl_path nf_net_ipv4_netfilter_sysctl_path[];
#endif /* CONFIG_SYSCTL */
extern struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS];
extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
struct net_device *indev, struct net_device *outdev,
@@ -247,7 +257,7 @@ struct nf_afinfo {
int route_key_size;
};
extern const struct nf_afinfo *nf_afinfo[NPROTO];
extern const struct nf_afinfo *nf_afinfo[NFPROTO_NUMPROTO];
static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
{
return rcu_dereference(nf_afinfo[family]);