Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6

[pandora-kernel.git] / include / linux / netfilter / x_tables.h

diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h
index adbc50a..7b1a652 100644 (file)
--- 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>