From 7dddfa338800303335673df637a05d8aaaccdaa2 Mon Sep 17 00:00:00 2001
From: Christian Poessinger <christian@poessinger.com>
Date: Mon, 25 May 2020 21:11:43 +0200
Subject: dhcpv6-pd: T2506: add option to request specific prefix length

Some ISPs (e.g. Comcast) only delegate a /64 by default. You have to explicitly
"ask" for a bigger (e.g. /60) prefix. This commit adds a CLI node to request
a specific prefix length in the range 32 - 64.

  dhcpv6-options {
      prefix-delegation {
          length 60
      }
  }
---
 src/conf_mode/interfaces-pppoe.py | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/conf_mode/interfaces-pppoe.py')

diff --git a/src/conf_mode/interfaces-pppoe.py b/src/conf_mode/interfaces-pppoe.py
index e8aeb810f..eaa61cdb6 100755
--- a/src/conf_mode/interfaces-pppoe.py
+++ b/src/conf_mode/interfaces-pppoe.py
@@ -36,6 +36,7 @@ default_config_data = {
     'deleted': False,
     'description': '\0',
     'disable': False,
+    'dhcpv6_pd_length': '',
     'dhcpv6_pd_interfaces': [],
     'intf': '',
     'idle_timeout': '',
@@ -142,6 +143,11 @@ def get_config():
                                       'dhcpv6-options', 'prefix-delegation']
         conf.set_level(dhcpv6_pd_path)
 
+        # retriebe DHCPv6-PD prefix helper length as some ISPs only hand out a
+        # /64 by default (https://phabricator.vyos.net/T2506)
+        if conf.exists(['length']):
+            pppoe['dhcpv6_pd_length'] = conf.return_value(['length'])
+
         for interface in conf.list_nodes(['interface']):
             conf.set_level(dhcpv6_pd_path + ['interface', interface])
             pd = {
-- 
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