ipv6: eui64: T3413: add custom validator

VyOS 1.2 (crux) rejected prefixes other then of site /64.
[ interfaces ethernet eth0 ipv6 address eui64 2006:ab00:abe1::2/127 ]
Error: Prefix lenght is 127.  It must be 64.

Same should be done on VyOS 1.3 and newer

2 files changed, 18 insertions, 1 deletions

diff --git a/interface-definitions/include/interface/ipv6-address-eui64.xml.i b/interface-definitions/include/interface/ipv6-address-eui64.xml.i
index 47f60c439..fe1f43df4 100644
--- a/interface-definitions/include/interface/ipv6-address-eui64.xml.i
+++ b/interface-definitions/include/interface/ipv6-address-eui64.xml.i
@@ -7,8 +7,9 @@
       <description>IPv6 /64 network</description>
     </valueHelp>
     <constraint>
-      <validator name="ipv6-prefix"/>
+      <validator name="ipv6-eui64-prefix"/>
     </constraint>
+    <constraintErrorMessage>EUI64 prefix length must be 64</constraintErrorMessage>
     <multi/>
   </properties>
 </leafNode>
diff --git a/src/validators/ipv6-eui64-prefix b/src/validators/ipv6-eui64-prefix
new file mode 100755
index 000000000..d7f262633
--- /dev/null
+++ b/src/validators/ipv6-eui64-prefix
@@ -0,0 +1,16 @@
+#!/usr/bin/env python3
+
+# Validator used to check if given IPv6 prefix is of size /64 required by EUI64
+
+from sys import argv
+from sys import exit
+
+if __name__ == '__main__':
+    if len(argv) != 2:
+        exit(1)
+
+    prefix = argv[1]
+    if prefix.split('/')[1] == '64':
+        exit(0)
+
+    exit(1)