bgp: T3504: add support for per-peer graceful shutdown

This commit has a dependecy on FRRouting/frr#8403,
thus support will be "commented out" by default.

Author: c-po

data/templates/frr/bgp.frr.tmpl

@@ -35,6 +35,16 @@
 {%   if config.ebgp_multihop is defined and config.ebgp_multihop is not none %}
  neighbor {{ neighbor }} ebgp-multihop {{ config.ebgp_multihop }}
 {%   endif %}
+{%   if config.graceful_restart is defined and config.graceful_restart is not none %}
+{%     if config.graceful_restart == 'enable' %}
+{%       set graceful_restart = 'graceful-restart' %}
+{%     elif config.graceful_restart == 'disable' %}
+{%       set graceful_restart = 'graceful-restart-disable' %}
+{%     elif config.graceful_restart == 'restart-helper' %}
+{%       set graceful_restart = 'graceful-restart-helper' %}
+{%     endif %}
+ neighbor {{ neighbor }} {{ graceful_restart }}
+{%   endif %}
 {%   if config.local_as is defined and config.local_as is not none %}
 {%     for local_asn in config.local_as %}
  neighbor {{ neighbor }} local-as {{ local_asn }} {{ 'no-prepend' if config.local_as[local_asn].no_prepend is defined }}

interface-definitions/include/bgp/neighbor-graceful-restart.xml.i

@@ -0,0 +1,25 @@
+<!-- include start from bgp/neighbor-graceful-restart.xml.i -->
+<leafNode name="graceful-restart">
+  <properties>
+    <help>BGP graceful restart functionality</help>
+    <completionHelp>
+      <list>enable disable restart-helper</list>
+    </completionHelp>
+    <valueHelp>
+      <format>enable</format>
+      <description>Enable BGP graceful restart at peer level</description>
+    </valueHelp>
+    <valueHelp>
+      <format>disable</format>
+      <description>Disable BGP graceful restart at peer level</description>
+    </valueHelp>
+    <valueHelp>
+      <format>restart-helper</format>
+      <description>Enable BGP graceful restart helper only functionality</description>
+    </valueHelp>
+    <constraint>
+      <regex>^(enable|disable|restart-helper)$</regex>
+    </constraint>
+  </properties>
+</leafNode>
+<!-- include end -->

interface-definitions/include/bgp/protocol-common-config.xml.i

@@ -1000,6 +1000,10 @@
     #include <include/bgp/neighbor-disable-capability-negotiation.xml.i>
     #include <include/bgp/neighbor-disable-connected-check.xml.i>
     #include <include/bgp/neighbor-ebgp-multihop.xml.i>
+<!--
+    requires GitHub FRR issues #8403 to be fixed
+    bgp/neighbor-graceful-restart.xml.i
+-->
     <node name="interface">
       <properties>
         <help>Interface parameters</help>
@@ -1435,6 +1439,11 @@
     #include <include/bgp/neighbor-disable-capability-negotiation.xml.i>
     #include <include/bgp/neighbor-disable-connected-check.xml.i>
     #include <include/bgp/neighbor-ebgp-multihop.xml.i>
+<!--
+    requires GitHub FRR issues #8403 to be fixed
+    bgp/neighbor-graceful-restart.xml.i
+-->
+    #include <include/bgp/neighbor-graceful-restart.xml.i>
     #include <include/bgp/neighbor-local-as.xml.i>
     #include <include/bgp/neighbor-override-capability.xml.i>
     #include <include/bgp/neighbor-passive.xml.i>

src/conf_mode/protocols_bgp.py

@@ -161,7 +161,7 @@ def verify(bgp):
                 # Check if neighbor has both ipv4 unicast and ipv4 labeled unicast configured at the same time.
                 if 'ipv4_unicast' in peer_config['address_family'] and 'ipv4_labeled_unicast' in peer_config['address_family']:
                     raise ConfigError(f'Neighbor "{peer}" cannot have both ipv4-unicast and ipv4-labeled-unicast configured at the same time!')
-                    
+
                 # Check if neighbor has both ipv6 unicast and ipv6 labeled unicast configured at the same time.
                 if 'ipv6_unicast' in peer_config['address_family'] and 'ipv6_labeled_unicast' in peer_config['address_family']:
                     raise ConfigError(f'Neighbor "{peer}" cannot have both ipv6-unicast and ipv6-labeled-unicast configured at the same time!')
@@ -214,7 +214,7 @@ def verify(bgp):
                 if dict_search(f'parameters.distance.global.{key}', bgp) == None:
                     raise ConfigError('Missing mandatory configuration option for '\
                                      f'global administrative distance {key}!')
-        
+
     # Throw an error if the address family specific administrative distance parameters aren't all filled out.
     if dict_search('address_family', bgp) == None:
         pass