T2802: Tunnel interface does not apply EUI-64 IPv6 Address

Generate an IPv6 Link Local address for wireguard interfaces.

1 files changed, 21 insertions, 1 deletions

diff --git a/python/vyos/ifconfig/wireguard.py b/python/vyos/ifconfig/wireguard.py
index da3bd4e89..5e9173349 100644
--- a/python/vyos/ifconfig/wireguard.py
+++ b/python/vyos/ifconfig/wireguard.py
@@ -26,6 +26,10 @@ from vyos.ifconfig import Interface
 from vyos.ifconfig import Operational
 from vyos.template import is_ipv6
 
+import random
+from random import seed, getrandbits
+from ipaddress import IPv6Network, IPv6Address
+
 class WireGuardOperational(Operational):
     def _dump(self):
         """Dump wireguard data in a python friendly way."""
@@ -168,7 +172,23 @@ class WireGuardIf(Interface):
     options = Interface.options + \
         ['port', 'private_key', 'pubkey', 'psk',
          'allowed_ips', 'fwmark', 'endpoint', 'keepalive']
-
+         
+    
+    def generate_link_local():
+        # Linux Kernel does not generate IPv6 Link Local address do to missing MAC
+        # We have to generate address manually and assign to interface
+        net = IPv6Network("FE80::/16")
+        rand_net = IPv6Network((net.network_address + (random.getrandbits(64 - net.prefixlen) << 64 ),64))
+        network = IPv6Network(rand_net)
+        address = str(IPv6Address(network.network_address + getrandbits(network.max_prefixlen - network.prefixlen)))+'/'+str(network.prefixlen)
+        
+        return address
+    
+    def _create(self):
+        super()._create(self)
+        # Assign generated IPv6 Link Local address to the interface
+        self.add_addr(self.generate_link_local())
+    
     def update(self, config):
         """ General helper function which works on a dictionary retrived by
         get_config_dict(). It's main intention is to consolidate the scattered