From 39e35ee4caae7dc40f7270b3dc5e4161d64dac1b Mon Sep 17 00:00:00 2001
From: Viacheslav Hletenko <v.gletenko@vyos.io>
Date: Tue, 19 Apr 2022 23:16:59 +0000
Subject: dhcpv6: T4357: Add dhcpv6 options for cisco VoIP tftp

Add vendor specific options for DHCPv6-server  for working with
cisco VoIP phone provisioning over IPv6
---
 data/templates/dhcp-server/dhcpdv6.conf.j2 |  8 ++++++++
 interface-definitions/dhcpv6-server.xml.in | 27 +++++++++++++++++++++++++++
 src/conf_mode/dhcpv6_server.py             |  8 ++++++++
 3 files changed, 43 insertions(+)

diff --git a/data/templates/dhcp-server/dhcpdv6.conf.j2 b/data/templates/dhcp-server/dhcpdv6.conf.j2
index 284b7f269..43327859e 100644
--- a/data/templates/dhcp-server/dhcpdv6.conf.j2
+++ b/data/templates/dhcp-server/dhcpdv6.conf.j2
@@ -11,6 +11,11 @@ option dhcp6.preference {{ preference }};
 {% if global_parameters.name_server is vyos_defined %}
 option dhcp6.name-servers {{ global_parameters.name_server | join(', ') }};
 {% endif %}
+{% if vsio_cisco_tftp %}
+option space cisco;
+option cisco.tftp-servers code 1 = array of ip6-address;
+option vsio.cisco code 9 = encapsulate cisco;
+{% endif %}
 
 # Shared network configration(s)
 {% if shared_network_name is vyos_defined %}
@@ -112,6 +117,9 @@ shared-network {{ network }} {
 {%                         endif %}
         }
 {%                     endfor %}
+{%                 endif %}
+{%                 if subnet_config.vsio.cisco.tftp_server is vyos_defined %}
+        option cisco.tftp-servers {{ subnet_config.vsio.cisco.tftp_server | join(', ') }};
 {%                 endif %}
     }
 {%             endfor %}
diff --git a/interface-definitions/dhcpv6-server.xml.in b/interface-definitions/dhcpv6-server.xml.in
index fb96571f5..5f290595e 100644
--- a/interface-definitions/dhcpv6-server.xml.in
+++ b/interface-definitions/dhcpv6-server.xml.in
@@ -338,6 +338,33 @@
                       </leafNode>
                     </children>
                   </tagNode>
+                  <node name="vsio">
+                    <properties>
+                      <help>Vendor-specific Information Option</help>
+                    </properties>
+                    <children>
+                      <node name="cisco">
+                        <properties>
+                          <help>Parameters for cisco</help>
+                        </properties>
+                        <children>
+                          <leafNode name="tftp-server">
+                            <properties>
+                              <help>Parameters for cisco VoIP</help>
+                              <valueHelp>
+                                <format>ipv6</format>
+                                <description>TFTP IPv6 address</description>
+                              </valueHelp>
+                              <constraint>
+                                <validator name="ipv6-address"/>
+                              </constraint>
+                              <multi/>
+                            </properties>
+                          </leafNode>
+                        </children>
+                      </node>
+                    </children>
+                  </node>
                 </children>
               </tagNode>
             </children>
diff --git a/src/conf_mode/dhcpv6_server.py b/src/conf_mode/dhcpv6_server.py
index 9922f2c5c..d0736eadb 100755
--- a/src/conf_mode/dhcpv6_server.py
+++ b/src/conf_mode/dhcpv6_server.py
@@ -42,6 +42,14 @@ def get_config(config=None):
         return None
 
     dhcpv6 = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True)
+
+    for network, network_config in dhcpv6['shared_network_name'].items():
+        # A shared-network requires a subnet definition
+        if 'subnet' in network_config:
+            for subnet, subnet_config in network_config['subnet'].items():
+                if dict_search('vsio.cisco.tftp_server', subnet_config):
+                    dhcpv6['vsio_cisco_tftp'] = True
+
     return dhcpv6
 
 def verify(dhcpv6):
-- 
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