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| author | Jan Engelhardt <jengelh@medozas.de> | 2009-07-09 23:00:19 +0200 |
|---|---|---|
| committer | Jan Engelhardt <jengelh@medozas.de> | 2009-08-10 13:35:27 +0200 |
| commit | 47901dc2c4a3f1f9af453486a005d31fe9b393f0 (patch) | |
| tree | 12bcbe4b7add3cc9beff300165ac4d962015ad15 /net/ipv6 | |
| parent | e5afbba1869a5d9509c61f8962be9bdebf95f7d3 (diff) | |
| download | linux-47901dc2c4a3f1f9af453486a005d31fe9b393f0.tar.bz2 | |
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.c | 11 |
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) || \ |