diff options
| author | Eric Dumazet <dada1@cosmosbay.com> | 2009-03-25 17:31:52 +0100 |
|---|---|---|
| committer | Patrick McHardy <kaber@trash.net> | 2009-03-25 17:31:52 +0100 |
| commit | b8dfe498775de912116f275680ddb57c8799d9ef (patch) | |
| tree | 0472ffb18e0354deedc37bcab8c7d9bb4a2941bb /include/linux/netfilter/x_tables.h | |
| parent | 78f3648601fdc7a8166748bbd6d0555a88efa24a (diff) | |
| download | linux-b8dfe498775de912116f275680ddb57c8799d9ef.tar.gz | |
netfilter: factorize ifname_compare()
We use same not trivial helper function in four places. We can factorize it.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'include/linux/netfilter/x_tables.h')
| -rw-r--r-- | include/linux/netfilter/x_tables.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h index e8e08d03675295..72918b7cbe8555 100644 --- a/include/linux/netfilter/x_tables.h +++ b/include/linux/netfilter/x_tables.h @@ -435,6 +435,29 @@ extern void xt_free_table_info(struct xt_table_info *info); extern void xt_table_entry_swap_rcu(struct xt_table_info *old, struct xt_table_info *new); +/* + * This helper is performance critical and must be inlined + */ +static inline unsigned long ifname_compare_aligned(const char *_a, + const char *_b, + const char *_mask) +{ + const unsigned long *a = (const unsigned long *)_a; + const unsigned long *b = (const unsigned long *)_b; + const unsigned long *mask = (const unsigned long *)_mask; + unsigned long ret; + + ret = (a[0] ^ b[0]) & mask[0]; + if (IFNAMSIZ > sizeof(unsigned long)) + ret |= (a[1] ^ b[1]) & mask[1]; + if (IFNAMSIZ > 2 * sizeof(unsigned long)) + ret |= (a[2] ^ b[2]) & mask[2]; + if (IFNAMSIZ > 3 * sizeof(unsigned long)) + ret |= (a[3] ^ b[3]) & mask[3]; + BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long)); + return ret; +} + #ifdef CONFIG_COMPAT #include <net/compat.h> |