From 920d87447ca479c311102260e5816ec0f5268a9b Mon Sep 17 00:00:00 2001
From: Daniil Baturin <daniil@vyos.io>
Date: Sun, 26 Jul 2020 14:02:47 +0300
Subject: T1949: backport the IPv6 BFD validation improvements from PR#199

---
 python/vyos/validate.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'python/vyos')

diff --git a/python/vyos/validate.py b/python/vyos/validate.py
index 8def0a510..ffe530ede 100644
--- a/python/vyos/validate.py
+++ b/python/vyos/validate.py
@@ -38,6 +38,18 @@ def is_ipv6(addr):
     else:
         return False
 
+def is_ipv6_link_local(addr):
+    """
+    Check addr if it is an IPv6 link-local address/network. Returns True/False
+    """
+
+    addr = addr.split('%')[0]
+    if is_ipv6(addr):
+        if ipaddress.IPv6Address(addr).is_link_local:
+            return True
+
+    return False
+
 def is_addr_assigned(addr):
     """
     Verify if the given IPv4/IPv6 address is assigned to any interface on this
-- 
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