Use logic operations rather than memcmp() to compare destination
address with link local multicast addresses.
Signed-off-by: Stephen Hemminger <[EMAIL PROTECTED]>
---
net/bridge/br_input.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- netem-dev.orig/net/bridge/br_input.c
+++ netem-dev/net/bridge/br_input.c
@@ -112,7 +112,11 @@ static int br_handle_local_finish(struct
*/
static inline int is_link_local(const unsigned char *dest)
{
- return memcmp(dest, br_group_address, 5) == 0 && (dest[5] & 0xf0) == 0;
+ const u16 *a = (const u16 *) dest;
+ static const u16 *const b = (const u16 *const ) br_group_address;
+ static const u16 m = __constant_cpu_to_be16(0xfff0);
+
+ return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0;
}
/*
-
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