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| author | David S. Miller <davem@davemloft.net> | 2009-03-26 22:45:23 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-03-26 22:45:23 -0700 |
| commit | 01e6de64d9c8d0e75dca3bb4cf898db73abe00d4 (patch) | |
| tree | 925982e6241e5ac47f268bc2c2942ab0f06775cd /include/linux/netfilter | |
| parent | 8f1ead2d1a626ed0c85b3d2c2046a49081d5933f (diff) | |
| parent | d271e8bd8c60ce059ee36d836ba063cfc61c3e21 (diff) | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6
Diffstat (limited to 'include/linux/netfilter')
| -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 adbc50a20ec2..7b1a652066c0 100644 --- a/include/linux/netfilter/x_tables.h +++ b/include/linux/netfilter/x_tables.h @@ -437,6 +437,29 @@ 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> |