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authorDavid S. Miller <davem@davemloft.net>2009-03-26 22:45:23 -0700
committerDavid S. Miller <davem@davemloft.net>2009-03-26 22:45:23 -0700
commit01e6de64d9c8d0e75dca3bb4cf898db73abe00d4 (patch)
tree925982e6241e5ac47f268bc2c2942ab0f06775cd /include/linux
parent8f1ead2d1a626ed0c85b3d2c2046a49081d5933f (diff)
parentd271e8bd8c60ce059ee36d836ba063cfc61c3e21 (diff)
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/netfilter/x_tables.h23
1 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h
index adbc50a20ec..7b1a652066c 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>