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authorChristian Breunig <christian@breunig.cc>2023-12-30 23:25:20 +0100
committerChristian Breunig <christian@breunig.cc>2023-12-31 23:49:48 +0100
commit4ef110fd2c501b718344c72d495ad7e16d2bd465 (patch)
treee98bf08f93c029ec4431a3b6ca078e7562e0cc58 /src/conf_mode/protocols_segment-routing.py
parent2286b8600da6c631b17e1d5b9b341843e50f9abf (diff)
downloadvyos-1x-4ef110fd2c501b718344c72d495ad7e16d2bd465.tar.gz
vyos-1x-4ef110fd2c501b718344c72d495ad7e16d2bd465.zip
T5474: establish common file name pattern for XML conf mode commands
We will use _ as CLI level divider. The XML definition filename and also the Python helper should match the CLI node. Example: set interfaces ethernet -> interfaces_ethernet.xml.in set interfaces bond -> interfaces_bond.xml.in set service dhcp-server -> service_dhcp-server-xml.in
Diffstat (limited to 'src/conf_mode/protocols_segment-routing.py')
-rwxr-xr-xsrc/conf_mode/protocols_segment-routing.py118
1 files changed, 118 insertions, 0 deletions
diff --git a/src/conf_mode/protocols_segment-routing.py b/src/conf_mode/protocols_segment-routing.py
new file mode 100755
index 000000000..d865c2ac0
--- /dev/null
+++ b/src/conf_mode/protocols_segment-routing.py
@@ -0,0 +1,118 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2023 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 node_changed
+from vyos.template import render_to_string
+from vyos.utils.dict import dict_search
+from vyos.utils.system import sysctl_write
+from vyos import ConfigError
+from vyos import frr
+from vyos import airbag
+airbag.enable()
+
+def get_config(config=None):
+ if config:
+ conf = config
+ else:
+ conf = Config()
+
+ base = ['protocols', 'segment-routing']
+ sr = conf.get_config_dict(base, key_mangling=('-', '_'),
+ get_first_key=True,
+ no_tag_node_value_mangle=True,
+ with_recursive_defaults=True)
+
+ # 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
+ # removal of interfaces from the running configuration.
+ interfaces_removed = node_changed(conf, base + ['interface'])
+ if interfaces_removed:
+ sr['interface_removed'] = list(interfaces_removed)
+
+ import pprint
+ pprint.pprint(sr)
+ return sr
+
+def verify(sr):
+ if 'srv6' in sr:
+ srv6_enable = False
+ if 'interface' in sr:
+ for interface, interface_config in sr['interface'].items():
+ if 'srv6' in interface_config:
+ srv6_enable = True
+ break
+ if not srv6_enable:
+ raise ConfigError('SRv6 should be enabled on at least one interface!')
+ return None
+
+def generate(sr):
+ if not sr:
+ return None
+
+ sr['new_frr_config'] = render_to_string('frr/zebra.segment_routing.frr.j2', sr)
+ return None
+
+def apply(sr):
+ zebra_daemon = 'zebra'
+
+ if 'interface_removed' in sr:
+ for interface in sr['interface_removed']:
+ # Disable processing of IPv6-SR packets
+ sysctl_write(f'net.ipv6.conf.{interface}.seg6_enabled', '0')
+
+ if 'interface' in sr:
+ for interface, interface_config in sr['interface'].items():
+ # Accept or drop SR-enabled IPv6 packets on this interface
+ if 'srv6' in interface_config:
+ sysctl_write(f'net.ipv6.conf.{interface}.seg6_enabled', '1')
+ # Define HMAC policy for ingress SR-enabled packets on this interface
+ # It's a redundant check as HMAC has a default value - but better safe
+ # then sorry
+ tmp = dict_search('srv6.hmac', interface_config)
+ if tmp == 'accept':
+ sysctl_write(f'net.ipv6.conf.{interface}.seg6_require_hmac', '0')
+ elif tmp == 'drop':
+ sysctl_write(f'net.ipv6.conf.{interface}.seg6_require_hmac', '1')
+ elif tmp == 'ignore':
+ sysctl_write(f'net.ipv6.conf.{interface}.seg6_require_hmac', '-1')
+ else:
+ sysctl_write(f'net.ipv6.conf.{interface}.seg6_enabled', '0')
+
+ # Save original configuration prior to starting any commit actions
+ frr_cfg = frr.FRRConfig()
+ frr_cfg.load_configuration(zebra_daemon)
+ frr_cfg.modify_section(r'^segment-routing')
+ if 'new_frr_config' in sr:
+ frr_cfg.add_before(frr.default_add_before, sr['new_frr_config'])
+ frr_cfg.commit_configuration(zebra_daemon)
+
+ return None
+
+if __name__ == '__main__':
+ try:
+ c = get_config()
+ verify(c)
+ generate(c)
+ apply(c)
+ except ConfigError as e:
+ print(e)
+ exit(1)