From 17dd50751d72079ff67c67b3b4143ec234793955 Mon Sep 17 00:00:00 2001
From: "Benjamin M. Hughes" <bmhughes@bmhughes.co.uk>
Date: Tue, 7 Jan 2020 14:47:06 +0000
Subject: bfd: T1949: fix verification logic for IPv6 BFD peers

IPv6 BFD peers only require a source address unless link-local addresses are used.
---
 python/vyos/validate.py | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'python/vyos')

diff --git a/python/vyos/validate.py b/python/vyos/validate.py
index 1ce5a8467..8ffef64fa 100644
--- a/python/vyos/validate.py
+++ b/python/vyos/validate.py
@@ -52,6 +52,17 @@ def is_ipv6(addr):
 
     return False
 
+def is_ipv6_link_local(addr):
+    """
+    Check addr if it is an IPv6 link-local address/network. Returns True/False
+    """
+
+    if is_ipv6(addr):
+        if ipaddress.IPv6Address(addr).is_link_local:
+            return True
+
+    return False
+
 def is_intf_addr_assigned(intf, addr):
     """
     Verify if the given IPv4/IPv6 address is assigned to specific interface.
-- 
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