From 192903561e5d7211155554fe06c18673fa74e1ed Mon Sep 17 00:00:00 2001
From: Christian Poessinger <christian@poessinger.com>
Date: Sun, 28 Nov 2021 10:00:57 +0100
Subject: ospfv3: T3928: add VRF support

set vrf name foo protocols ospfv3
---
 src/conf_mode/protocols_ospfv3.py | 46 +++++++++++++++++++++++++++++++++------
 1 file changed, 39 insertions(+), 7 deletions(-)

(limited to 'src/conf_mode')

diff --git a/src/conf_mode/protocols_ospfv3.py b/src/conf_mode/protocols_ospfv3.py
index f1e490f48..d0460b830 100755
--- a/src/conf_mode/protocols_ospfv3.py
+++ b/src/conf_mode/protocols_ospfv3.py
@@ -17,6 +17,7 @@
 import os
 
 from sys import exit
+from sys import argv
 
 from vyos.config import Config
 from vyos.configdict import dict_merge
@@ -24,6 +25,7 @@ from vyos.configdict import node_changed
 from vyos.configverify import verify_common_route_maps
 from vyos.template import render_to_string
 from vyos.ifconfig import Interface
+from vyos.util import get_interface_config
 from vyos.xml import defaults
 from vyos import ConfigError
 from vyos import frr
@@ -35,9 +37,22 @@ def get_config(config=None):
         conf = config
     else:
         conf = Config()
-    base = ['protocols', 'ospfv3']
+
+    vrf = None
+    if len(argv) > 1:
+        vrf = argv[1]
+
+    base_path = ['protocols', 'ospfv3']
+
+    # eqivalent of the C foo ? 'a' : 'b' statement
+    base = vrf and ['vrf', 'name', vrf, 'protocols', 'ospfv3'] or base_path
     ospfv3 = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
 
+    # Assign the name of our VRF context. This MUST be done before the return
+    # statement below, else on deletion we will delete the default instance
+    # instead of the VRF instance.
+    if vrf: ospfv3['vrf'] = vrf
+
     # FRR has VRF support for different routing daemons. As interfaces belong
     # to VRFs - or the global VRF, we need to check for changed interfaces so
     # that they will be properly rendered for the FRR config. Also this eases
@@ -69,12 +84,22 @@ def verify(ospfv3):
     verify_common_route_maps(ospfv3)
 
     if 'interface' in ospfv3:
-        for ifname, if_config in ospfv3['interface'].items():
-            if 'ifmtu' in if_config:
-                mtu = Interface(ifname).get_mtu()
-                if int(if_config['ifmtu']) > int(mtu):
+        for interface, interface_config in ospfv3['interface'].items():
+            if 'ifmtu' in interface_config:
+                mtu = Interface(interface).get_mtu()
+                if int(interface_config['ifmtu']) > int(mtu):
                     raise ConfigError(f'OSPFv3 ifmtu can not exceed physical MTU of "{mtu}"')
 
+            # If interface specific options are set, we must ensure that the
+            # interface is bound to our requesting VRF. Due to the VyOS
+            # priorities the interface is bound to the VRF after creation of
+            # the VRF itself, and before any routing protocol is configured.
+            if 'vrf' in ospfv3:
+                vrf = ospfv3['vrf']
+                tmp = get_interface_config(interface)
+                if 'master' not in tmp or tmp['master'] != vrf:
+                    raise ConfigError(f'Interface {interface} is not a member of VRF {vrf}!')
+
     return None
 
 def generate(ospfv3):
@@ -89,14 +114,21 @@ def apply(ospfv3):
 
     # Save original configuration prior to starting any commit actions
     frr_cfg = frr.FRRConfig()
+
+    # Generate empty helper string which can be ammended to FRR commands, it
+    # will be either empty (default VRF) or contain the "vrf <name" statement
+    vrf = ''
+    if 'vrf' in ospfv3:
+        vrf = ' vrf ' + ospfv3['vrf']
+
     frr_cfg.load_configuration(ospf6_daemon)
-    frr_cfg.modify_section('^router ospf6', stop_pattern='^exit', remove_stop_mark=True)
+    frr_cfg.modify_section(f'^router ospf6{vrf}', stop_pattern='^exit', remove_stop_mark=True)
 
     for key in ['interface', 'interface_removed']:
         if key not in ospfv3:
             continue
         for interface in ospfv3[key]:
-            frr_cfg.modify_section(f'^interface {interface}', stop_pattern='^exit', remove_stop_mark=True)
+            frr_cfg.modify_section(f'^interface {interface}{vrf}', stop_pattern='^exit', remove_stop_mark=True)
 
     if 'new_frr_config' in ospfv3:
         frr_cfg.add_before(frr.default_add_before, ospfv3['new_frr_config'])
-- 
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