From 18cbaad5ad490fbb3a4e9b188dd419d789f45ccb Mon Sep 17 00:00:00 2001
From: Isaku Yamahata <yamahata@valinux.co.jp>
Date: Fri, 27 Jan 2012 17:47:07 +0900
Subject: lib/mac: add helper function/values

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
 ryu/lib/mac.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/ryu/lib/mac.py b/ryu/lib/mac.py
index 2dbf6e80..be4d7d60 100644
--- a/ryu/lib/mac.py
+++ b/ryu/lib/mac.py
@@ -14,6 +14,14 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
+DONTCARE = '\x00' * 6
+BROADCAST = '\xff' * 6
+
+
+def is_multicast(addr):
+    return bool(ord(addr[0]) & 0x01)
+
+
 def haddr_to_str(addr):
     return ''.join(['%02x:' % ord(char) for char in addr[0:6]])[:-1]
 
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