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authorJan Engelhardt <jengelh@medozas.de>2009-07-10 01:00:19 +0400
committerJan Engelhardt <jengelh@medozas.de>2009-08-10 15:35:27 +0400
commit47901dc2c4a3f1f9af453486a005d31fe9b393f0 (patch)
tree12bcbe4b7add3cc9beff300165ac4d962015ad15 /net/ipv6
parente5afbba1869a5d9509c61f8962be9bdebf95f7d3 (diff)
downloadlinux-47901dc2c4a3f1f9af453486a005d31fe9b393f0.tar.xz
netfilter: xtables: use memcmp in unconditional check
Instead of inspecting each u32/char open-coded, clean up and make use of memcmp. On some arches, memcmp is implemented as assembly or GCC's __builtin_memcmp which can possibly take advantages of known alignment. Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/netfilter/ip6_tables.c11
1 files changed, 3 insertions, 8 deletions
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index ced1f2c0cb65..1389ad904bc3 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -222,16 +222,11 @@ get_entry(void *base, unsigned int offset)
/* All zeroes == unconditional rule. */
/* Mildly perf critical (only if packet tracing is on) */
-static inline int
-unconditional(const struct ip6t_ip6 *ipv6)
+static inline bool unconditional(const struct ip6t_ip6 *ipv6)
{
- unsigned int i;
-
- for (i = 0; i < sizeof(*ipv6); i++)
- if (((char *)ipv6)[i])
- break;
+ static const struct ip6t_ip6 uncond;
- return (i == sizeof(*ipv6));
+ return memcmp(ipv6, &uncond, sizeof(uncond)) == 0;
}
#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \