Merge pull request #614 from sever-sever/T439

policy-conf: T439: Add policy local-route PBR

1 files changed, 110 insertions, 0 deletions

diff --git a/src/conf_mode/policy-local-route.py b/src/conf_mode/policy-local-route.py
new file mode 100755
index 000000000..c4024dce4
--- /dev/null
+++ b/src/conf_mode/policy-local-route.py
@@ -0,0 +1,110 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2020 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+
+from sys import exit
+
+from vyos.config import Config
+from vyos.configdict import dict_merge
+from vyos.configdict import node_changed
+from vyos.configdict import leaf_node_changed
+from vyos.template import render
+from vyos.util import call
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+
+def get_config(config=None):
+
+    if config:
+        conf = config
+    else:
+        conf = Config()
+    base = ['policy', 'local-route']
+    pbr = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
+
+    # delete policy local-route
+    dict = {}
+    tmp = node_changed(conf, ['policy', 'local-route', 'rule'])
+    if tmp:
+        for rule in (tmp or []):
+            src = leaf_node_changed(conf, ['policy', 'local-route', 'rule', rule, 'source'])
+            if src:
+                dict = dict_merge({'rule_remove' : {rule : {'source' : src}}}, dict)
+                pbr.update(dict)
+
+    # delete policy local-route rule x source x.x.x.x
+    if 'rule' in pbr:
+        for rule in pbr['rule']:
+            src = leaf_node_changed(conf, ['policy', 'local-route', 'rule', rule, 'source'])
+            if src:
+                dict = dict_merge({'rule_remove' : {rule : {'source' : src}}}, dict)
+                pbr.update(dict)
+
+    return pbr
+
+def verify(pbr):
+    # bail out early - looks like removal from running config
+    if not pbr:
+        return None
+
+    if 'rule' in pbr:
+        for rule in pbr['rule']:
+            if 'source' not in pbr['rule'][rule]:
+                raise ConfigError('Source address required!')
+            else:
+                if 'set' not in pbr['rule'][rule] or 'table' not in pbr['rule'][rule]['set']:
+                    raise ConfigError('Table set is required!')
+
+    return None
+
+def generate(pbr):
+    if not pbr:
+        return None
+
+    return None
+
+def apply(pbr):
+    if not pbr:
+        return None
+
+    # Delete old rule if needed
+    if 'rule_remove' in pbr:
+        for rule in pbr['rule_remove']:
+            for src in pbr['rule_remove'][rule]['source']:
+                call(f'ip rule del prio {rule} from {src}')
+
+    # Generate new config
+    if 'rule' in pbr:
+        for rule in pbr['rule']:
+            table = pbr['rule'][rule]['set']['table']
+            if pbr['rule'][rule]['source']:
+                for src in pbr['rule'][rule]['source']:
+                    call(f'ip rule add prio {rule} from {src} lookup {table}')
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)